---

Appendix B Summary of Library Facilities

This appendix is a complete list of the facilities declared within the header files supplied with the GNU C Library. Each entry also lists the standard or other source from which each facility is derived, and tells you where in the manual you can find more information about how to use it.

ACCOUNTING

utmp.h (SVID): Manipulating the User Accounting Database.

AF_FILE

sys/socket.h (GNU): Address Formats.

AF_INET

sys/socket.h (BSD): Address Formats.

AF_INET6

sys/socket.h (IPv6 Basic API): Address Formats.

AF_LOCAL

sys/socket.h (POSIX): Address Formats.

AF_UNIX

sys/socket.h (BSD): Address Formats.

sys/socket.h (Unix98): Address Formats.

AF_UNSPEC

sys/socket.h (BSD): Address Formats.

tcflag_t ALTWERASE

termios.h (BSD): Local Modes.

int ARGP_ERR_UNKNOWN

argp.h (GNU): Argp Parser Functions.

ARGP_HELP_BUG_ADDR

argp.h (GNU): Flags for the argp_help Function.

ARGP_HELP_DOC

argp.h (GNU): Flags for the argp_help Function.

ARGP_HELP_EXIT_ERR

argp.h (GNU): Flags for the argp_help Function.

ARGP_HELP_EXIT_OK

argp.h (GNU): Flags for the argp_help Function.

ARGP_HELP_LONG

argp.h (GNU): Flags for the argp_help Function.

ARGP_HELP_LONG_ONLY

argp.h (GNU): Flags for the argp_help Function.

ARGP_HELP_POST_DOC

argp.h (GNU): Flags for the argp_help Function.

ARGP_HELP_PRE_DOC

argp.h (GNU): Flags for the argp_help Function.

ARGP_HELP_SEE

argp.h (GNU): Flags for the argp_help Function.

ARGP_HELP_SHORT_USAGE

argp.h (GNU): Flags for the argp_help Function.

ARGP_HELP_STD_ERR

argp.h (GNU): Flags for the argp_help Function.

ARGP_HELP_STD_HELP

argp.h (GNU): Flags for the argp_help Function.

ARGP_HELP_STD_USAGE

argp.h (GNU): Flags for the argp_help Function.

ARGP_HELP_USAGE

argp.h (GNU): Flags for the argp_help Function.

ARGP_IN_ORDER

argp.h (GNU): Flags for argp_parse.

ARGP_KEY_ARG

argp.h (GNU): Special Keys for Argp Parser Functions.

ARGP_KEY_ARGS

argp.h (GNU): Special Keys for Argp Parser Functions.

ARGP_KEY_END

argp.h (GNU): Special Keys for Argp Parser Functions.

ARGP_KEY_ERROR

argp.h (GNU): Special Keys for Argp Parser Functions.

ARGP_KEY_FINI

argp.h (GNU): Special Keys for Argp Parser Functions.

ARGP_KEY_HELP_ARGS_DOC

argp.h (GNU): Special Keys for Argp Help Filter Functions.

ARGP_KEY_HELP_DUP_ARGS_NOTE

argp.h (GNU): Special Keys for Argp Help Filter Functions.

ARGP_KEY_HELP_EXTRA

argp.h (GNU): Special Keys for Argp Help Filter Functions.

ARGP_KEY_HELP_HEADER

argp.h (GNU): Special Keys for Argp Help Filter Functions.

ARGP_KEY_HELP_POST_DOC

argp.h (GNU): Special Keys for Argp Help Filter Functions.

ARGP_KEY_HELP_PRE_DOC

argp.h (GNU): Special Keys for Argp Help Filter Functions.

ARGP_KEY_INIT

argp.h (GNU): Special Keys for Argp Parser Functions.

ARGP_KEY_NO_ARGS

argp.h (GNU): Special Keys for Argp Parser Functions.

ARGP_KEY_SUCCESS

argp.h (GNU): Special Keys for Argp Parser Functions.

ARGP_LONG_ONLY

argp.h (GNU): Flags for argp_parse.

ARGP_NO_ARGS

argp.h (GNU): Flags for argp_parse.

ARGP_NO_ERRS

argp.h (GNU): Flags for argp_parse.

ARGP_NO_EXIT

argp.h (GNU): Flags for argp_parse.

ARGP_NO_HELP

argp.h (GNU): Flags for argp_parse.

ARGP_PARSE_ARGV0

argp.h (GNU): Flags for argp_parse.

ARGP_SILENT

argp.h (GNU): Flags for argp_parse.

int ARG_MAX

limits.h (POSIX.1): General Capacity Limits.

int BC_BASE_MAX

limits.h (POSIX.2): Utility Program Capacity Limits.

int BC_DIM_MAX

limits.h (POSIX.2): Utility Program Capacity Limits.

int BC_SCALE_MAX

limits.h (POSIX.2): Utility Program Capacity Limits.

int BC_STRING_MAX

limits.h (POSIX.2): Utility Program Capacity Limits.

BOOT_TIME

utmp.h (SVID): Manipulating the User Accounting Database.

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

tcflag_t BRKINT

termios.h (POSIX.1): Input Modes.

int BUFSIZ

stdio.h (ISO): Controlling Which Kind of Buffering.

tcflag_t CCTS_OFLOW

termios.h (BSD): Control Modes.

int CHAR_BIT

limits.h (C90): Width of an Integer Type.

CHAR_MAX

limits.h (ISO): Range of an Integer Type.

CHAR_MIN

limits.h (ISO): Range of an Integer Type.

CHAR_WIDTH

limits.h (ISO): Width of an Integer Type.

int CHILD_MAX

limits.h (POSIX.1): General Capacity Limits.

tcflag_t CIGNORE

termios.h (BSD): Control Modes.

int CLK_TCK

time.h (POSIX.1): Processor Time Inquiry.

tcflag_t CLOCAL

termios.h (POSIX.1): Control Modes.

int CLOCKS_PER_SEC

time.h (ISO): CPU Time Inquiry.

clockid_t CLOCK_MONOTONIC

time.h (POSIX.1): Getting the Time.

clockid_t CLOCK_REALTIME

time.h (POSIX.1): Getting the Time.

int COLL_WEIGHTS_MAX

limits.h (POSIX.2): Utility Program Capacity Limits.

void CPU_CLR (int cpu, cpu_set_t *set)

sched.h (GNU): Limiting execution to certain CPUs.

int CPU_ISSET (int cpu, const cpu_set_t *set)

sched.h (GNU): Limiting execution to certain CPUs.

void CPU_SET (int cpu, cpu_set_t *set)

sched.h (GNU): Limiting execution to certain CPUs.

int CPU_SETSIZE

sched.h (GNU): Limiting execution to certain CPUs.

void CPU_ZERO (cpu_set_t *set)

sched.h (GNU): Limiting execution to certain CPUs.

tcflag_t CREAD

termios.h (POSIX.1): Control Modes.

tcflag_t CRTS_IFLOW

termios.h (BSD): Control Modes.

tcflag_t CS5

termios.h (POSIX.1): Control Modes.

tcflag_t CS6

termios.h (POSIX.1): Control Modes.

tcflag_t CS7

termios.h (POSIX.1): Control Modes.

tcflag_t CS8

termios.h (POSIX.1): Control Modes.

tcflag_t CSIZE

termios.h (POSIX.1): Control Modes.

tcflag_t CSTOPB

termios.h (POSIX.1): Control Modes.

DBL_DIG

float.h (C90): Floating Point Parameters.

DBL_EPSILON

float.h (C90): Floating Point Parameters.

DBL_MANT_DIG

float.h (C90): Floating Point Parameters.

DBL_MAX

float.h (C90): Floating Point Parameters.

DBL_MAX_10_EXP

float.h (C90): Floating Point Parameters.

DBL_MAX_EXP

float.h (C90): Floating Point Parameters.

DBL_MIN

float.h (C90): Floating Point Parameters.

DBL_MIN_10_EXP

float.h (C90): Floating Point Parameters.

DBL_MIN_EXP

float.h (C90): Floating Point Parameters.

DEAD_PROCESS

utmp.h (SVID): Manipulating the User Accounting Database.

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

DIR

dirent.h (POSIX.1): Opening a Directory Stream.

int DLFO_EH_SEGMENT_TYPE

dlfcn.h (GNU): Dynamic Linker Introspection.

int DLFO_STRUCT_HAS_EH_COUNT

dlfcn.h (GNU): Dynamic Linker Introspection.

int DLFO_STRUCT_HAS_EH_DBASE

dlfcn.h (GNU): Dynamic Linker Introspection.

mode_t DTTOIF (int dtype)

dirent.h (BSD): Format of a Directory Entry.

int E2BIG

errno.h (POSIX.1): Error Codes.

int EACCES

errno.h (POSIX.1): Error Codes.

int EADDRINUSE

errno.h (BSD): Error Codes.

int EADDRNOTAVAIL

errno.h (BSD): Error Codes.

int EADV

errno.h (Linux???): Error Codes.

int EAFNOSUPPORT

errno.h (BSD): Error Codes.

int EAGAIN

errno.h (POSIX.1): Error Codes.

int EALREADY

errno.h (BSD): Error Codes.

int EAUTH

errno.h (BSD): Error Codes.

int EBACKGROUND

errno.h (GNU): Error Codes.

int EBADE

errno.h (Linux???): Error Codes.

int EBADF

errno.h (POSIX.1): Error Codes.

int EBADFD

errno.h (Linux???): Error Codes.

int EBADMSG

errno.h (XOPEN): Error Codes.

int EBADR

errno.h (Linux???): Error Codes.

int EBADRPC

errno.h (BSD): Error Codes.

int EBADRQC

errno.h (Linux???): Error Codes.

int EBADSLT

errno.h (Linux???): Error Codes.

int EBFONT

errno.h (Linux???): Error Codes.

int EBUSY

errno.h (POSIX.1): Error Codes.

int ECANCELED

errno.h (POSIX.1): Error Codes.

int ECHILD

errno.h (POSIX.1): Error Codes.

tcflag_t ECHO

termios.h (POSIX.1): Local Modes.

tcflag_t ECHOCTL

termios.h (BSD): Local Modes.

tcflag_t ECHOE

termios.h (POSIX.1): Local Modes.

tcflag_t ECHOK

termios.h (POSIX.1): Local Modes.

tcflag_t ECHOKE

termios.h (BSD): Local Modes.

tcflag_t ECHONL

termios.h (POSIX.1): Local Modes.

tcflag_t ECHOPRT

termios.h (BSD): Local Modes.

int ECHRNG

errno.h (Linux???): Error Codes.

int ECOMM

errno.h (Linux???): Error Codes.

int ECONNABORTED

errno.h (BSD): Error Codes.

int ECONNREFUSED

errno.h (BSD): Error Codes.

int ECONNRESET

errno.h (BSD): Error Codes.

int ED

errno.h (GNU): Error Codes.

int EDEADLK

errno.h (POSIX.1): Error Codes.

int EDEADLOCK

errno.h (Linux???): Error Codes.

int EDESTADDRREQ

errno.h (BSD): Error Codes.

int EDIED

errno.h (GNU): Error Codes.

int EDOM

errno.h (ISO): Error Codes.

int EDOTDOT

errno.h (Linux???): Error Codes.

int EDQUOT

errno.h (BSD): Error Codes.

int EEXIST

errno.h (POSIX.1): Error Codes.

int EFAULT

errno.h (POSIX.1): Error Codes.

int EFBIG

errno.h (POSIX.1): Error Codes.

int EFTYPE

errno.h (BSD): Error Codes.

int EGRATUITOUS

errno.h (GNU): Error Codes.

int EGREGIOUS

errno.h (GNU): Error Codes.

int EHOSTDOWN

errno.h (BSD): Error Codes.

int EHOSTUNREACH

errno.h (BSD): Error Codes.

int EHWPOISON

errno.h (Linux): Error Codes.

int EIDRM

errno.h (XOPEN): Error Codes.

int EIEIO

errno.h (GNU): Error Codes.

int EILSEQ

errno.h (ISO): Error Codes.

int EINPROGRESS

errno.h (BSD): Error Codes.

int EINTR

errno.h (POSIX.1): Error Codes.

int EINVAL

errno.h (POSIX.1): Error Codes.

int EIO

errno.h (POSIX.1): Error Codes.

int EISCONN

errno.h (BSD): Error Codes.

int EISDIR

errno.h (POSIX.1): Error Codes.

int EISNAM

errno.h (Linux???): Error Codes.

int EKEYEXPIRED

errno.h (Linux): Error Codes.

int EKEYREJECTED

errno.h (Linux): Error Codes.

int EKEYREVOKED

errno.h (Linux): Error Codes.

int EL2HLT

errno.h (Obsolete): Error Codes.

int EL2NSYNC

errno.h (Obsolete): Error Codes.

int EL3HLT

errno.h (Obsolete): Error Codes.

int EL3RST

errno.h (Obsolete): Error Codes.

int ELIBACC

errno.h (Linux???): Error Codes.

int ELIBBAD

errno.h (Linux???): Error Codes.

int ELIBEXEC

errno.h (GNU): Error Codes.

int ELIBMAX

errno.h (Linux???): Error Codes.

int ELIBSCN

errno.h (Linux???): Error Codes.

int ELNRNG

errno.h (Linux???): Error Codes.

int ELOOP

errno.h (BSD): Error Codes.

int EMEDIUMTYPE

errno.h (Linux???): Error Codes.

int EMFILE

errno.h (POSIX.1): Error Codes.

int EMLINK

errno.h (POSIX.1): Error Codes.

EMPTY

utmp.h (SVID): Manipulating the User Accounting Database.

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

int EMSGSIZE

errno.h (BSD): Error Codes.

int EMULTIHOP

errno.h (XOPEN): Error Codes.

int ENAMETOOLONG

errno.h (POSIX.1): Error Codes.

int ENAVAIL

errno.h (Linux???): Error Codes.

int ENEEDAUTH

errno.h (BSD): Error Codes.

int ENETDOWN

errno.h (BSD): Error Codes.

int ENETRESET

errno.h (BSD): Error Codes.

int ENETUNREACH

errno.h (BSD): Error Codes.

int ENFILE

errno.h (POSIX.1): Error Codes.

int ENOANO

errno.h (Linux???): Error Codes.

int ENOBUFS

errno.h (BSD): Error Codes.

int ENOCSI

errno.h (Linux???): Error Codes.

int ENODATA

errno.h (XOPEN): Error Codes.

int ENODEV

errno.h (POSIX.1): Error Codes.

int ENOENT

errno.h (POSIX.1): Error Codes.

int ENOEXEC

errno.h (POSIX.1): Error Codes.

int ENOKEY

errno.h (Linux): Error Codes.

int ENOLCK

errno.h (POSIX.1): Error Codes.

int ENOLINK

errno.h (XOPEN): Error Codes.

int ENOMEDIUM

errno.h (Linux???): Error Codes.

int ENOMEM

errno.h (POSIX.1): Error Codes.

int ENOMSG

errno.h (XOPEN): Error Codes.

int ENONET

errno.h (Linux???): Error Codes.

int ENOPKG

errno.h (Linux???): Error Codes.

int ENOPROTOOPT

errno.h (BSD): Error Codes.

int ENOSPC

errno.h (POSIX.1): Error Codes.

int ENOSR

errno.h (XOPEN): Error Codes.

int ENOSTR

errno.h (XOPEN): Error Codes.

int ENOSYS

errno.h (POSIX.1): Error Codes.

int ENOTBLK

errno.h (BSD): Error Codes.

int ENOTCONN

errno.h (BSD): Error Codes.

int ENOTDIR

errno.h (POSIX.1): Error Codes.

int ENOTEMPTY

errno.h (POSIX.1): Error Codes.

int ENOTNAM

errno.h (Linux???): Error Codes.

int ENOTRECOVERABLE

errno.h (GNU): Error Codes.

int ENOTSOCK

errno.h (BSD): Error Codes.

int ENOTSUP

errno.h (POSIX.1): Error Codes.

int ENOTTY

errno.h (POSIX.1): Error Codes.

int ENOTUNIQ

errno.h (Linux???): Error Codes.

int ENXIO

errno.h (POSIX.1): Error Codes.

int EOF

stdio.h (ISO): End-Of-File and Errors.

int EOPNOTSUPP

errno.h (BSD): Error Codes.

int EOVERFLOW

errno.h (XOPEN): Error Codes.

int EOWNERDEAD

errno.h (GNU): Error Codes.

int EPERM

errno.h (POSIX.1): Error Codes.

int EPFNOSUPPORT

errno.h (BSD): Error Codes.

int EPIPE

errno.h (POSIX.1): Error Codes.

int EPROCLIM

errno.h (BSD): Error Codes.

int EPROCUNAVAIL

errno.h (BSD): Error Codes.

int EPROGMISMATCH

errno.h (BSD): Error Codes.

int EPROGUNAVAIL

errno.h (BSD): Error Codes.

int EPROTO

errno.h (XOPEN): Error Codes.

int EPROTONOSUPPORT

errno.h (BSD): Error Codes.

int EPROTOTYPE

errno.h (BSD): Error Codes.

int EQUIV_CLASS_MAX

limits.h (POSIX.2): Utility Program Capacity Limits.

int ERANGE

errno.h (ISO): Error Codes.

int EREMCHG

errno.h (Linux???): Error Codes.

int EREMOTE

errno.h (BSD): Error Codes.

int EREMOTEIO

errno.h (Linux???): Error Codes.

int ERESTART

errno.h (Linux???): Error Codes.

int ERFKILL

errno.h (Linux): Error Codes.

int EROFS

errno.h (POSIX.1): Error Codes.

int ERPCMISMATCH

errno.h (BSD): Error Codes.

int ESHUTDOWN

errno.h (BSD): Error Codes.

int ESOCKTNOSUPPORT

errno.h (BSD): Error Codes.

int ESPIPE

errno.h (POSIX.1): Error Codes.

int ESRCH

errno.h (POSIX.1): Error Codes.

int ESRMNT

errno.h (Linux???): Error Codes.

int ESTALE

errno.h (BSD): Error Codes.

int ESTRPIPE

errno.h (Linux???): Error Codes.

int ETIME

errno.h (XOPEN): Error Codes.

int ETIMEDOUT

errno.h (BSD): Error Codes.

int ETOOMANYREFS

errno.h (BSD): Error Codes.

int ETXTBSY

errno.h (BSD): Error Codes.

int EUCLEAN

errno.h (Linux???): Error Codes.

int EUNATCH

errno.h (Linux???): Error Codes.

int EUSERS

errno.h (BSD): Error Codes.

int EWOULDBLOCK

errno.h (BSD): Error Codes.

int EXDEV

errno.h (POSIX.1): Error Codes.

int EXFULL

errno.h (Linux???): Error Codes.

int EXIT_FAILURE

stdlib.h (ISO): Exit Status.

int EXIT_SUCCESS

stdlib.h (ISO): Exit Status.

int EXPR_NEST_MAX

limits.h (POSIX.2): Utility Program Capacity Limits.

int FD_CLOEXEC

fcntl.h (POSIX.1): File Descriptor Flags.

void FD_CLR (int filedes, fd_set *set)

sys/types.h (BSD): Waiting for Input or Output.

int FD_ISSET (int filedes, const fd_set *set)

sys/types.h (BSD): Waiting for Input or Output.

void FD_SET (int filedes, fd_set *set)

sys/types.h (BSD): Waiting for Input or Output.

int FD_SETSIZE

sys/types.h (BSD): Waiting for Input or Output.

void FD_ZERO (fd_set *set)

sys/types.h (BSD): Waiting for Input or Output.

FE_DIVBYZERO

fenv.h (ISO): Examining the FPU status word.

FE_DOWNWARD

fenv.h (ISO): Rounding Modes.

FE_INEXACT

fenv.h (ISO): Examining the FPU status word.

FE_INVALID

fenv.h (ISO): Examining the FPU status word.

FE_OVERFLOW

fenv.h (ISO): Examining the FPU status word.

int FE_SNANS_ALWAYS_SIGNAL

fenv.h (ISO): Infinity and NaN.

FE_TONEAREST

fenv.h (ISO): Rounding Modes.

FE_TOWARDZERO

fenv.h (ISO): Rounding Modes.

FE_UNDERFLOW

fenv.h (ISO): Examining the FPU status word.

FE_UPWARD

fenv.h (ISO): Rounding Modes.

FILE

stdio.h (ISO): Streams.

int FILENAME_MAX

stdio.h (ISO): Limits on File System Capacity.

FLT_DIG

float.h (C90): Floating Point Parameters.

FLT_EPSILON

float.h (C90): Floating Point Parameters.

FLT_MANT_DIG

float.h (C90): Floating Point Parameters.

FLT_MAX

float.h (C90): Floating Point Parameters.

FLT_MAX_10_EXP

float.h (C90): Floating Point Parameters.

FLT_MAX_EXP

float.h (C90): Floating Point Parameters.

FLT_MIN

float.h (C90): Floating Point Parameters.

FLT_MIN_10_EXP

float.h (C90): Floating Point Parameters.

FLT_MIN_EXP

float.h (C90): Floating Point Parameters.

FLT_RADIX

float.h (C90): Floating Point Parameters.

FLT_ROUNDS

float.h (C90): Floating Point Parameters.

tcflag_t FLUSHO

termios.h (BSD): Local Modes.

FNM_CASEFOLD

fnmatch.h (GNU): Wildcard Matching.

FNM_EXTMATCH

fnmatch.h (GNU): Wildcard Matching.

FNM_FILE_NAME

fnmatch.h (GNU): Wildcard Matching.

FNM_LEADING_DIR

fnmatch.h (GNU): Wildcard Matching.

FNM_NOESCAPE

fnmatch.h (POSIX.2): Wildcard Matching.

FNM_PATHNAME

fnmatch.h (POSIX.2): Wildcard Matching.

FNM_PERIOD

fnmatch.h (POSIX.2): Wildcard Matching.

int FOPEN_MAX

stdio.h (ISO): Opening Streams.

FPE_DECOVF_TRAP

signal.h (BSD): Program Error Signals.

FPE_FLTDIV_FAULT

signal.h (BSD): Program Error Signals.

FPE_FLTDIV_TRAP

signal.h (BSD): Program Error Signals.

FPE_FLTOVF_FAULT

signal.h (BSD): Program Error Signals.

FPE_FLTOVF_TRAP

signal.h (BSD): Program Error Signals.

FPE_FLTUND_FAULT

signal.h (BSD): Program Error Signals.

FPE_FLTUND_TRAP

signal.h (BSD): Program Error Signals.

FPE_INTDIV_TRAP

signal.h (BSD): Program Error Signals.

FPE_INTOVF_TRAP

signal.h (BSD): Program Error Signals.

FPE_SUBRNG_TRAP

signal.h (BSD): Program Error Signals.

int FP_ILOGB0

math.h (ISO): Exponentiation and Logarithms.

int FP_ILOGBNAN

math.h (ISO): Exponentiation and Logarithms.

FP_INFINITE

math.h (C99): Floating-Point Number Classification Functions.

FP_INT_DOWNWARD

math.h (ISO): Rounding Functions.

FP_INT_TONEAREST

math.h (ISO): Rounding Functions.

FP_INT_TONEARESTFROMZERO

math.h (ISO): Rounding Functions.

FP_INT_TOWARDZERO

math.h (ISO): Rounding Functions.

FP_INT_UPWARD

math.h (ISO): Rounding Functions.

long int FP_LLOGB0

math.h (ISO): Exponentiation and Logarithms.

long int FP_LLOGBNAN

math.h (ISO): Exponentiation and Logarithms.

FP_NAN

math.h (C99): Floating-Point Number Classification Functions.

FP_NORMAL

math.h (C99): Floating-Point Number Classification Functions.

FP_SUBNORMAL

math.h (C99): Floating-Point Number Classification Functions.

FP_ZERO

math.h (C99): Floating-Point Number Classification Functions.

struct FTW

ftw.h (XPG4.2): Working with Directory Trees.

int F_DUPFD

fcntl.h (POSIX.1): Duplicating Descriptors.

int F_GETFD

fcntl.h (POSIX.1): File Descriptor Flags.

int F_GETFL

fcntl.h (POSIX.1): Getting and Setting File Status Flags.

int F_GETLK

fcntl.h (POSIX.1): File Locks.

int F_GETOWN

fcntl.h (BSD): Interrupt-Driven Input.

int F_OFD_SETLK

fcntl.h (POSIX.1): Open File Description Locks.

int F_OFD_SETLKW

fcntl.h (POSIX.1): Open File Description Locks.

int F_OK

unistd.h (POSIX.1): Testing Permission to Access a File.

F_RDLCK

fcntl.h (POSIX.1): File Locks.

int F_SETFD

fcntl.h (POSIX.1): File Descriptor Flags.

int F_SETFL

fcntl.h (POSIX.1): Getting and Setting File Status Flags.

int F_SETLK

fcntl.h (POSIX.1): File Locks.

int F_SETLKW

fcntl.h (POSIX.1): File Locks.

int F_SETOWN

fcntl.h (BSD): Interrupt-Driven Input.

F_UNLCK

fcntl.h (POSIX.1): File Locks.

F_WRLCK

fcntl.h (POSIX.1): File Locks.

GLOB_ABORTED

glob.h (POSIX.2): Calling glob.

GLOB_ALTDIRFUNC

glob.h (GNU): More Flags for Globbing.

GLOB_APPEND

glob.h (POSIX.2): Flags for Globbing.

GLOB_BRACE

glob.h (GNU): More Flags for Globbing.

GLOB_DOOFFS

glob.h (POSIX.2): Flags for Globbing.

GLOB_ERR

glob.h (POSIX.2): Flags for Globbing.

GLOB_MAGCHAR

glob.h (GNU): More Flags for Globbing.

GLOB_MARK

glob.h (POSIX.2): Flags for Globbing.

GLOB_NOCHECK

glob.h (POSIX.2): Flags for Globbing.

GLOB_NOESCAPE

glob.h (POSIX.2): Flags for Globbing.

GLOB_NOMAGIC

glob.h (GNU): More Flags for Globbing.

GLOB_NOMATCH

glob.h (POSIX.2): Calling glob.

GLOB_NOSORT

glob.h (POSIX.2): Flags for Globbing.

GLOB_NOSPACE

glob.h (POSIX.2): Calling glob.

GLOB_ONLYDIR

glob.h (GNU): More Flags for Globbing.

GLOB_PERIOD

glob.h (GNU): More Flags for Globbing.

GLOB_TILDE

glob.h (GNU): More Flags for Globbing.

GLOB_TILDE_CHECK

glob.h (GNU): More Flags for Globbing.

HOST_NOT_FOUND

netdb.h (BSD): Host Names.

double HUGE_VAL

math.h (ISO): Error Reporting by Mathematical Functions.

float HUGE_VALF

math.h (ISO): Error Reporting by Mathematical Functions.

long double HUGE_VALL

math.h (ISO): Error Reporting by Mathematical Functions.

_FloatN HUGE_VAL_FN

math.h (TS 18661-3:2015): Error Reporting by Mathematical Functions.

_FloatNx HUGE_VAL_FNx

math.h (TS 18661-3:2015): Error Reporting by Mathematical Functions.

tcflag_t HUPCL

termios.h (POSIX.1): Control Modes.

const float complex I

complex.h (C99): Complex Numbers.

tcflag_t ICANON

termios.h (POSIX.1): Local Modes.

tcflag_t ICRNL

termios.h (POSIX.1): Input Modes.

tcflag_t IEXTEN

termios.h (POSIX.1): Local Modes.

size_t IFNAMSIZ

net/if.h (???): Interface Naming.

int IFTODT (mode_t mode)

dirent.h (BSD): Format of a Directory Entry.

tcflag_t IGNBRK

termios.h (POSIX.1): Input Modes.

tcflag_t IGNCR

termios.h (POSIX.1): Input Modes.

tcflag_t IGNPAR

termios.h (POSIX.1): Input Modes.

tcflag_t IMAXBEL

termios.h (BSD): Input Modes.

uint32_t INADDR_ANY

netinet/in.h (BSD): Host Address Data Type.

uint32_t INADDR_BROADCAST

netinet/in.h (BSD): Host Address Data Type.

uint32_t INADDR_LOOPBACK

netinet/in.h (BSD): Host Address Data Type.

uint32_t INADDR_NONE

netinet/in.h (BSD): Host Address Data Type.

float INFINITY

math.h (ISO): Infinity and NaN.

INIT_PROCESS

utmp.h (SVID): Manipulating the User Accounting Database.

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

tcflag_t INLCR

termios.h (POSIX.1): Input Modes.

tcflag_t INPCK

termios.h (POSIX.1): Input Modes.

INTPTR_WIDTH

stdint.h (ISO): Width of an Integer Type.

INT_MAX

limits.h (ISO): Range of an Integer Type.

INT_MIN

limits.h (ISO): Range of an Integer Type.

INT_WIDTH

limits.h (ISO): Width of an Integer Type.

int IPPORT_RESERVED

netinet/in.h (BSD): Internet Ports.

int IPPORT_USERRESERVED

netinet/in.h (BSD): Internet Ports.

tcflag_t ISIG

termios.h (POSIX.1): Local Modes.

tcflag_t ISTRIP

termios.h (POSIX.1): Input Modes.

ITIMER_PROF

sys/time.h (BSD): Setting an Alarm.

ITIMER_REAL

sys/time.h (BSD): Setting an Alarm.

ITIMER_VIRTUAL

sys/time.h (BSD): Setting an Alarm.

tcflag_t IXANY

termios.h (BSD): Input Modes.

tcflag_t IXOFF

termios.h (POSIX.1): Input Modes.

tcflag_t IXON

termios.h (POSIX.1): Input Modes.

LANG

locale.h (ISO): Locale Categories.

LC_ALL

locale.h (ISO): Locale Categories.

LC_COLLATE

locale.h (ISO): Locale Categories.

LC_CTYPE

locale.h (ISO): Locale Categories.

LC_MESSAGES

locale.h (XOPEN): Locale Categories.

LC_MONETARY

locale.h (ISO): Locale Categories.

LC_NUMERIC

locale.h (ISO): Locale Categories.

LC_TIME

locale.h (ISO): Locale Categories.

LDBL_DIG

float.h (C90): Floating Point Parameters.

LDBL_EPSILON

float.h (C90): Floating Point Parameters.

LDBL_MANT_DIG

float.h (C90): Floating Point Parameters.

LDBL_MAX

float.h (C90): Floating Point Parameters.

LDBL_MAX_10_EXP

float.h (C90): Floating Point Parameters.

LDBL_MAX_EXP

float.h (C90): Floating Point Parameters.

LDBL_MIN

float.h (C90): Floating Point Parameters.

LDBL_MIN_10_EXP

float.h (C90): Floating Point Parameters.

LDBL_MIN_EXP

float.h (C90): Floating Point Parameters.

int LINE_MAX

limits.h (POSIX.2): Utility Program Capacity Limits.

int LINK_MAX

limits.h optional (POSIX.1): Limits on File System Capacity.

LLONG_MAX

limits.h (ISO): Range of an Integer Type.

LLONG_MIN

limits.h (ISO): Range of an Integer Type.

LLONG_WIDTH

limits.h (ISO): Width of an Integer Type.

LOGIN_PROCESS

utmp.h (SVID): Manipulating the User Accounting Database.

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

LONG_LONG_MAX

limits.h (GNU): Range of an Integer Type.

LONG_LONG_MIN

limits.h (GNU): Range of an Integer Type.

LONG_MAX

limits.h (ISO): Range of an Integer Type.

LONG_MIN

limits.h (ISO): Range of an Integer Type.

LONG_WIDTH

limits.h (ISO): Width of an Integer Type.

L_INCR

sys/file.h (BSD): File Positioning.

L_SET

sys/file.h (BSD): File Positioning.

L_XTND

sys/file.h (BSD): File Positioning.

int L_ctermid

stdio.h (POSIX.1): Identifying the Controlling Terminal.

int L_cuserid

stdio.h (POSIX.1): Identifying Who Logged In.

int L_tmpnam

stdio.h (ISO): Temporary Files.

MADV_HUGEPAGE

sys/mman.h (Linux): Memory-mapped I/O.

MAP_HUGETLB

sys/mman.h (Linux): Memory-mapped I/O.

int MAXNAMLEN

dirent.h (BSD): Limits on File System Capacity.

int MAXSYMLINKS

sys/param.h (BSD): Symbolic Links.

int MAX_CANON

limits.h (POSIX.1): Limits on File System Capacity.

int MAX_INPUT

limits.h (POSIX.1): Limits on File System Capacity.

int MB_CUR_MAX

stdlib.h (ISO): Selecting the conversion and its properties.

int MB_LEN_MAX

limits.h (ISO): Selecting the conversion and its properties.

tcflag_t MDMBUF

termios.h (BSD): Control Modes.

MFD_ALLOW_SEALING

sys/mman.h (Linux): Memory-mapped I/O.

MFD_CLOEXEC

sys/mman.h (Linux): Memory-mapped I/O.

MFD_HUGETLB

sys/mman.h (Linux): Memory-mapped I/O.

MLOCK_ONFAULT

sys/mman.h (Linux): Functions To Lock And Unlock Pages.

int MSG_DONTROUTE

sys/socket.h (BSD): Socket Data Options.

int MSG_OOB

sys/socket.h (BSD): Socket Data Options.

int MSG_PEEK

sys/socket.h (BSD): Socket Data Options.

int NAME_MAX

limits.h (POSIX.1): Limits on File System Capacity.

float NAN

math.h (GNU): Infinity and NaN.

int NCCS

termios.h (POSIX.1): Terminal Mode Data Types.

NEW_TIME

utmp.h (SVID): Manipulating the User Accounting Database.

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

int NGROUPS_MAX

limits.h (POSIX.1): General Capacity Limits.

tcflag_t NOFLSH

termios.h (POSIX.1): Local Modes.

tcflag_t NOKERNINFO

termios.h optional (BSD): Local Modes.

NO_ADDRESS

netdb.h (BSD): Host Names.

NO_RECOVERY

netdb.h (BSD): Host Names.

int NSIG

signal.h (BSD): Standard Signals.

void * NULL

stddef.h (ISO): Null Pointer Constant.

OLD_TIME

utmp.h (SVID): Manipulating the User Accounting Database.

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

ONCE_FLAG_INIT

threads.h (C11): Call Once.

tcflag_t ONLCR

termios.h (POSIX.1): Output Modes.

tcflag_t ONOEOT

termios.h optional (BSD): Output Modes.

int OPEN_MAX

limits.h (POSIX.1): General Capacity Limits.

tcflag_t OPOST

termios.h (POSIX.1): Output Modes.

OPTION_ALIAS

argp.h (GNU): Flags for Argp Options.

OPTION_ARG_OPTIONAL

argp.h (GNU): Flags for Argp Options.

OPTION_DOC

argp.h (GNU): Flags for Argp Options.

OPTION_HIDDEN

argp.h (GNU): Flags for Argp Options.

OPTION_NO_USAGE

argp.h (GNU): Flags for Argp Options.

tcflag_t OXTABS

termios.h optional (BSD): Output Modes.

int O_ACCMODE

fcntl.h (POSIX.1): File Access Modes.

int O_APPEND

fcntl.h (POSIX.1): I/O Operating Modes.

int O_ASYNC

fcntl.h (BSD): I/O Operating Modes.

int O_CREAT

fcntl.h (POSIX.1): Open-time Flags.

int O_DIRECTORY

fcntl.h (POSIX.1): Open-time Flags.

int O_EXCL

fcntl.h (POSIX.1): Open-time Flags.

int O_EXEC

fcntl.h optional (GNU): File Access Modes.

int O_EXLOCK

fcntl.h optional (BSD): Open-time Flags.

int O_FSYNC

fcntl.h (BSD): I/O Operating Modes.

int O_IGNORE_CTTY

fcntl.h optional (GNU): Open-time Flags.

int O_NDELAY

fcntl.h (BSD): I/O Operating Modes.

int O_NOATIME

fcntl.h (GNU): I/O Operating Modes.

int O_NOCTTY

fcntl.h (POSIX.1): Open-time Flags.

int O_NOFOLLOW

fcntl.h (POSIX.1): Open-time Flags.

int O_NOLINK

fcntl.h optional (GNU): Open-time Flags.

int O_NONBLOCK

fcntl.h (POSIX.1): Open-time Flags.

fcntl.h (POSIX.1): I/O Operating Modes.

int O_NOTRANS

fcntl.h optional (GNU): Open-time Flags.

int O_PATH

fcntl.h (Linux): File Access Modes.

int O_RDONLY

fcntl.h (POSIX.1): File Access Modes.

int O_RDWR

fcntl.h (POSIX.1): File Access Modes.

int O_READ

fcntl.h optional (GNU): File Access Modes.

int O_SHLOCK

fcntl.h optional (BSD): Open-time Flags.

int O_SYNC

fcntl.h (BSD): I/O Operating Modes.

int O_TMPFILE

fcntl.h (GNU): Open-time Flags.

int O_TRUNC

fcntl.h (POSIX.1): Open-time Flags.

int O_WRITE

fcntl.h optional (GNU): File Access Modes.

int O_WRONLY

fcntl.h (POSIX.1): File Access Modes.

tcflag_t PARENB

termios.h (POSIX.1): Control Modes.

tcflag_t PARMRK

termios.h (POSIX.1): Input Modes.

tcflag_t PARODD

termios.h (POSIX.1): Control Modes.

int PATH_MAX

limits.h (POSIX.1): Limits on File System Capacity.

PA_CHAR

printf.h (GNU): Parsing a Template String.

PA_DOUBLE

printf.h (GNU): Parsing a Template String.

PA_FLAG_LONG

printf.h (GNU): Parsing a Template String.

PA_FLAG_LONG_DOUBLE

printf.h (GNU): Parsing a Template String.

PA_FLAG_LONG_LONG

printf.h (GNU): Parsing a Template String.

int PA_FLAG_MASK

printf.h (GNU): Parsing a Template String.

PA_FLAG_PTR

printf.h (GNU): Parsing a Template String.

PA_FLAG_SHORT

printf.h (GNU): Parsing a Template String.

PA_FLOAT

printf.h (GNU): Parsing a Template String.

PA_INT

printf.h (GNU): Parsing a Template String.

PA_LAST

printf.h (GNU): Parsing a Template String.

PA_POINTER

printf.h (GNU): Parsing a Template String.

PA_STRING

printf.h (GNU): Parsing a Template String.

tcflag_t PENDIN

termios.h (BSD): Local Modes.

int PF_FILE

sys/socket.h (GNU): Details of Local Namespace.

int PF_INET

sys/socket.h (BSD): The Internet Namespace.

int PF_INET6

sys/socket.h (X/Open): The Internet Namespace.

int PF_LOCAL

sys/socket.h (POSIX): Details of Local Namespace.

int PF_UNIX

sys/socket.h (BSD): Details of Local Namespace.

int PIPE_BUF

limits.h (POSIX.1): Limits on File System Capacity.

PKEY_DISABLE_ACCESS

sys/mman.h (Linux): Memory Protection.

PKEY_DISABLE_WRITE

sys/mman.h (Linux): Memory Protection.

POSIX_REC_INCR_XFER_SIZE

limits.h (POSIX.1): Minimum Values for File System Limits.

POSIX_REC_MAX_XFER_SIZE

limits.h (POSIX.1): Minimum Values for File System Limits.

POSIX_REC_MIN_XFER_SIZE

limits.h (POSIX.1): Minimum Values for File System Limits.

POSIX_REC_XFER_ALIGN

limits.h (POSIX.1): Minimum Values for File System Limits.

PRIO_MAX

sys/resource.h (BSD): Functions For Traditional Scheduling.

PRIO_MIN

sys/resource.h (BSD): Functions For Traditional Scheduling.

PRIO_PGRP

sys/resource.h (BSD): Functions For Traditional Scheduling.

PRIO_PROCESS

sys/resource.h (BSD): Functions For Traditional Scheduling.

PRIO_USER

sys/resource.h (BSD): Functions For Traditional Scheduling.

PROT_EXEC

sys/mman.h (POSIX): Memory Protection.

PROT_NONE

sys/mman.h (POSIX): Memory Protection.

PROT_READ

sys/mman.h (POSIX): Memory Protection.

PROT_WRITE

sys/mman.h (POSIX): Memory Protection.

PTRDIFF_WIDTH

stdint.h (ISO): Width of an Integer Type.

char * P_tmpdir

stdio.h (SVID): Temporary Files.

int RAND_MAX

stdlib.h (ISO): ISO C Random Number Functions.

REG_BADBR

regex.h (POSIX.2): POSIX Regular Expression Compilation.

REG_BADPAT

regex.h (POSIX.2): POSIX Regular Expression Compilation.

REG_BADRPT

regex.h (POSIX.2): POSIX Regular Expression Compilation.

REG_EBRACE

regex.h (POSIX.2): POSIX Regular Expression Compilation.

REG_EBRACK

regex.h (POSIX.2): POSIX Regular Expression Compilation.

REG_ECOLLATE

regex.h (POSIX.2): POSIX Regular Expression Compilation.

REG_ECTYPE

regex.h (POSIX.2): POSIX Regular Expression Compilation.

REG_EESCAPE

regex.h (POSIX.2): POSIX Regular Expression Compilation.

REG_EPAREN

regex.h (POSIX.2): POSIX Regular Expression Compilation.

REG_ERANGE

regex.h (POSIX.2): POSIX Regular Expression Compilation.

REG_ESPACE

regex.h (POSIX.2): POSIX Regular Expression Compilation.

regex.h (POSIX.2): Matching a Compiled POSIX Regular Expression.

REG_ESUBREG

regex.h (POSIX.2): POSIX Regular Expression Compilation.

REG_EXTENDED

regex.h (POSIX.2): Flags for POSIX Regular Expressions.

REG_ICASE

regex.h (POSIX.2): Flags for POSIX Regular Expressions.

REG_NEWLINE

regex.h (POSIX.2): Flags for POSIX Regular Expressions.

REG_NOMATCH

regex.h (POSIX.2): Matching a Compiled POSIX Regular Expression.

REG_NOSUB

regex.h (POSIX.2): Flags for POSIX Regular Expressions.

REG_NOTBOL

regex.h (POSIX.2): Matching a Compiled POSIX Regular Expression.

REG_NOTEOL

regex.h (POSIX.2): Matching a Compiled POSIX Regular Expression.

int RE_DUP_MAX

limits.h (POSIX.2): General Capacity Limits.

RLIMIT_AS

sys/resource.h (Unix98): Limiting Resource Usage.

RLIMIT_CORE

sys/resource.h (BSD): Limiting Resource Usage.

RLIMIT_CPU

sys/resource.h (BSD): Limiting Resource Usage.

RLIMIT_DATA

sys/resource.h (BSD): Limiting Resource Usage.

RLIMIT_FSIZE

sys/resource.h (BSD): Limiting Resource Usage.

RLIMIT_MEMLOCK

sys/resource.h (BSD): Limiting Resource Usage.

RLIMIT_NOFILE

sys/resource.h (BSD): Limiting Resource Usage.

RLIMIT_NPROC

sys/resource.h (BSD): Limiting Resource Usage.

RLIMIT_RSS

sys/resource.h (BSD): Limiting Resource Usage.

RLIMIT_STACK

sys/resource.h (BSD): Limiting Resource Usage.

rlim_t RLIM_INFINITY

sys/resource.h (BSD): Limiting Resource Usage.

RLIM_NLIMITS

sys/resource.h (BSD): Limiting Resource Usage.

int RSEQ_SIG

sys/rseq.h (Linux): Restartable Sequences.

RUN_LVL

utmp.h (SVID): Manipulating the User Accounting Database.

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

RUSAGE_CHILDREN

sys/resource.h (BSD): Resource Usage.

RUSAGE_SELF

sys/resource.h (BSD): Resource Usage.

int R_OK

unistd.h (POSIX.1): Testing Permission to Access a File.

int SA_NOCLDSTOP

signal.h (POSIX.1): Flags for sigaction.

int SA_ONSTACK

signal.h (BSD): Flags for sigaction.

int SA_RESTART

signal.h (BSD): Flags for sigaction.

SCHAR_MAX

limits.h (ISO): Range of an Integer Type.

SCHAR_MIN

limits.h (ISO): Range of an Integer Type.

SCHAR_WIDTH

limits.h (ISO): Width of an Integer Type.

int SEEK_CUR

stdio.h (ISO): File Positioning.

int SEEK_END

stdio.h (ISO): File Positioning.

int SEEK_SET

stdio.h (ISO): File Positioning.

SHRT_MAX

limits.h (ISO): Range of an Integer Type.

SHRT_MIN

limits.h (ISO): Range of an Integer Type.

SHRT_WIDTH

limits.h (ISO): Width of an Integer Type.

int SIGABRT

signal.h (ISO): Program Error Signals.

int SIGALRM

signal.h (POSIX.1): Alarm Signals.

int SIGBUS

signal.h (BSD): Program Error Signals.

int SIGCHLD

signal.h (POSIX.1): Job Control Signals.

int SIGCLD

signal.h (SVID): Job Control Signals.

int SIGCONT

signal.h (POSIX.1): Job Control Signals.

int SIGEMT

signal.h (BSD): Program Error Signals.

int SIGFPE

signal.h (ISO): Program Error Signals.

int SIGHUP

signal.h (POSIX.1): Termination Signals.

int SIGILL

signal.h (ISO): Program Error Signals.

int SIGINFO

signal.h (BSD): Miscellaneous Signals.

int SIGINT

signal.h (ISO): Termination Signals.

int SIGIO

signal.h (BSD): Asynchronous I/O Signals.

int SIGIOT

signal.h (Unix): Program Error Signals.

int SIGKILL

signal.h (POSIX.1): Termination Signals.

int SIGLOST

signal.h (GNU): Operation Error Signals.

int SIGPIPE

signal.h (POSIX.1): Operation Error Signals.

int SIGPOLL

signal.h (SVID): Asynchronous I/O Signals.

int SIGPROF

signal.h (BSD): Alarm Signals.

int SIGQUIT

signal.h (POSIX.1): Termination Signals.

int SIGSEGV

signal.h (ISO): Program Error Signals.

int SIGSTOP

signal.h (POSIX.1): Job Control Signals.

int SIGSYS

signal.h (Unix): Program Error Signals.

int SIGTERM

signal.h (ISO): Termination Signals.

int SIGTRAP

signal.h (BSD): Program Error Signals.

int SIGTSTP

signal.h (POSIX.1): Job Control Signals.

int SIGTTIN

signal.h (POSIX.1): Job Control Signals.

int SIGTTOU

signal.h (POSIX.1): Job Control Signals.

int SIGURG

signal.h (BSD): Asynchronous I/O Signals.

int SIGUSR1

signal.h (POSIX.1): Miscellaneous Signals.

int SIGUSR2

signal.h (POSIX.1): Miscellaneous Signals.

int SIGVTALRM

signal.h (BSD): Alarm Signals.

int SIGWINCH

signal.h (BSD): Miscellaneous Signals.

int SIGXCPU

signal.h (BSD): Operation Error Signals.

int SIGXFSZ

signal.h (BSD): Operation Error Signals.

SIG_ATOMIC_WIDTH

stdint.h (ISO): Width of an Integer Type.

SIG_BLOCK

signal.h (POSIX.1): Process Signal Mask.

sighandler_t SIG_ERR

signal.h (ISO): Basic Signal Handling.

SIG_SETMASK

signal.h (POSIX.1): Process Signal Mask.

SIG_UNBLOCK

signal.h (POSIX.1): Process Signal Mask.

SIZE_WIDTH

stdint.h (ISO): Width of an Integer Type.

double SNAN

math.h (TS 18661-1:2014): Infinity and NaN.

float SNANF

math.h (TS 18661-1:2014): Infinity and NaN.

_FloatN SNANFN

math.h (TS 18661-3:2015): Infinity and NaN.

_FloatNx SNANFNx

math.h (TS 18661-3:2015): Infinity and NaN.

long double SNANL

math.h (TS 18661-1:2014): Infinity and NaN.

int SOCK_DGRAM

sys/socket.h (BSD): Communication Styles.

int SOCK_RAW

sys/socket.h (BSD): Communication Styles.

int SOCK_STREAM

sys/socket.h (BSD): Communication Styles.

int SOL_SOCKET

sys/socket.h (BSD): Socket-Level Options.

SO_BROADCAST

sys/socket.h (BSD): Socket-Level Options.

SO_DEBUG

sys/socket.h (BSD): Socket-Level Options.

SO_DONTROUTE

sys/socket.h (BSD): Socket-Level Options.

SO_ERROR

sys/socket.h (BSD): Socket-Level Options.

SO_KEEPALIVE

sys/socket.h (BSD): Socket-Level Options.

SO_LINGER

sys/socket.h (BSD): Socket-Level Options.

SO_OOBINLINE

sys/socket.h (BSD): Socket-Level Options.

SO_RCVBUF

sys/socket.h (BSD): Socket-Level Options.

SO_REUSEADDR

sys/socket.h (BSD): Socket-Level Options.

SO_SNDBUF

sys/socket.h (BSD): Socket-Level Options.

SO_STYLE

sys/socket.h (GNU): Socket-Level Options.

SO_TYPE

sys/socket.h (BSD): Socket-Level Options.

ssize_t SSIZE_MAX

limits.h (POSIX.1): General Capacity Limits.

STDERR_FILENO

unistd.h (POSIX.1): Descriptors and Streams.

STDIN_FILENO

unistd.h (POSIX.1): Descriptors and Streams.

STDOUT_FILENO

unistd.h (POSIX.1): Descriptors and Streams.

int STREAM_MAX

limits.h (POSIX.1): General Capacity Limits.

int SUN_LEN (struct sockaddr_un * ptr)

sys/un.h (BSD): Details of Local Namespace.

SYMLINK_MAX

limits.h (POSIX.1): Minimum Values for File System Limits.

S_IEXEC

sys/stat.h (BSD): The Mode Bits for Access Permission.

S_IFBLK

sys/stat.h (BSD): Testing the Type of a File.

S_IFCHR

sys/stat.h (BSD): Testing the Type of a File.

S_IFDIR

sys/stat.h (BSD): Testing the Type of a File.

S_IFIFO

sys/stat.h (BSD): Testing the Type of a File.

S_IFLNK

sys/stat.h (BSD): Testing the Type of a File.

int S_IFMT

sys/stat.h (BSD): Testing the Type of a File.

S_IFREG

sys/stat.h (BSD): Testing the Type of a File.

S_IFSOCK

sys/stat.h (BSD): Testing the Type of a File.

S_IREAD

sys/stat.h (BSD): The Mode Bits for Access Permission.

S_IRGRP

sys/stat.h (POSIX.1): The Mode Bits for Access Permission.

S_IROTH

sys/stat.h (POSIX.1): The Mode Bits for Access Permission.

S_IRUSR

sys/stat.h (POSIX.1): The Mode Bits for Access Permission.

S_IRWXG

sys/stat.h (POSIX.1): The Mode Bits for Access Permission.

S_IRWXO

sys/stat.h (POSIX.1): The Mode Bits for Access Permission.

S_IRWXU

sys/stat.h (POSIX.1): The Mode Bits for Access Permission.

int S_ISBLK (mode_t m)

sys/stat.h (POSIX): Testing the Type of a File.

int S_ISCHR (mode_t m)

sys/stat.h (POSIX): Testing the Type of a File.

int S_ISDIR (mode_t m)

sys/stat.h (POSIX): Testing the Type of a File.

int S_ISFIFO (mode_t m)

sys/stat.h (POSIX): Testing the Type of a File.

S_ISGID

sys/stat.h (POSIX): The Mode Bits for Access Permission.

int S_ISLNK (mode_t m)

sys/stat.h (GNU): Testing the Type of a File.

int S_ISREG (mode_t m)

sys/stat.h (POSIX): Testing the Type of a File.

int S_ISSOCK (mode_t m)

sys/stat.h (GNU): Testing the Type of a File.

S_ISUID

sys/stat.h (POSIX): The Mode Bits for Access Permission.

S_ISVTX

sys/stat.h (BSD): The Mode Bits for Access Permission.

S_IWGRP

sys/stat.h (POSIX.1): The Mode Bits for Access Permission.

S_IWOTH

sys/stat.h (POSIX.1): The Mode Bits for Access Permission.

S_IWRITE

sys/stat.h (BSD): The Mode Bits for Access Permission.

S_IWUSR

sys/stat.h (POSIX.1): The Mode Bits for Access Permission.

S_IXGRP

sys/stat.h (POSIX.1): The Mode Bits for Access Permission.

S_IXOTH

sys/stat.h (POSIX.1): The Mode Bits for Access Permission.

S_IXUSR

sys/stat.h (POSIX.1): The Mode Bits for Access Permission.

int S_TYPEISMQ (struct stat *s)

sys/stat.h (POSIX): Testing the Type of a File.

int S_TYPEISSEM (struct stat *s)

sys/stat.h (POSIX): Testing the Type of a File.

int S_TYPEISSHM (struct stat *s)

sys/stat.h (POSIX): Testing the Type of a File.

TCSADRAIN

termios.h (POSIX.1): Terminal Mode Functions.

TCSAFLUSH

termios.h (POSIX.1): Terminal Mode Functions.

TCSANOW

termios.h (POSIX.1): Terminal Mode Functions.

TCSASOFT

termios.h (BSD): Terminal Mode Functions.

TEMP_FAILURE_RETRY (expression)

unistd.h (GNU): Primitives Interrupted by Signals.

int TMP_MAX

stdio.h (ISO): Temporary Files.

tcflag_t TOSTOP

termios.h (POSIX.1): Local Modes.

TRY_AGAIN

netdb.h (BSD): Host Names.

TSS_DTOR_ITERATIONS

threads.h (C11): Thread-local Storage.

int TZNAME_MAX

limits.h (POSIX.1): General Capacity Limits.

UCHAR_MAX

limits.h (ISO): Range of an Integer Type.

UCHAR_WIDTH

limits.h (ISO): Width of an Integer Type.

UINTPTR_WIDTH

stdint.h (ISO): Width of an Integer Type.

UINT_MAX

limits.h (ISO): Range of an Integer Type.

UINT_WIDTH

limits.h (ISO): Width of an Integer Type.

ULLONG_MAX

limits.h (ISO): Range of an Integer Type.

ULLONG_WIDTH

limits.h (ISO): Width of an Integer Type.

ULONG_LONG_MAX

limits.h (GNU): Range of an Integer Type.

ULONG_MAX

limits.h (ISO): Range of an Integer Type.

ULONG_WIDTH

limits.h (ISO): Width of an Integer Type.

USER_PROCESS

utmp.h (SVID): Manipulating the User Accounting Database.

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

USHRT_MAX

limits.h (ISO): Range of an Integer Type.

USHRT_WIDTH

limits.h (ISO): Width of an Integer Type.

int VDISCARD

termios.h (BSD): Other Special Characters.

int VDSUSP

termios.h (BSD): Characters that Cause Signals.

int VEOF

termios.h (POSIX.1): Characters for Input Editing.

int VEOL

termios.h (POSIX.1): Characters for Input Editing.

int VEOL2

termios.h (BSD): Characters for Input Editing.

int VERASE

termios.h (POSIX.1): Characters for Input Editing.

int VINTR

termios.h (POSIX.1): Characters that Cause Signals.

int VKILL

termios.h (POSIX.1): Characters for Input Editing.

int VLNEXT

termios.h (BSD): Other Special Characters.

int VMIN

termios.h (POSIX.1): Noncanonical Input.

int VQUIT

termios.h (POSIX.1): Characters that Cause Signals.

int VREPRINT

termios.h (BSD): Characters for Input Editing.

int VSTART

termios.h (POSIX.1): Special Characters for Flow Control.

int VSTATUS

termios.h (BSD): Other Special Characters.

int VSTOP

termios.h (POSIX.1): Special Characters for Flow Control.

int VSUSP

termios.h (POSIX.1): Characters that Cause Signals.

int VTIME

termios.h (POSIX.1): Noncanonical Input.

int VWERASE

termios.h (BSD): Characters for Input Editing.

WCHAR_MAX

limits.h (GNU): Range of an Integer Type.

wint_t WCHAR_MAX

wchar.h (ISO): Introduction to Extended Characters.

wint_t WCHAR_MIN

wchar.h (ISO): Introduction to Extended Characters.

WCHAR_WIDTH

stdint.h (ISO): Width of an Integer Type.

int WCOREDUMP (int status)

sys/wait.h (BSD): Process Completion Status.

int WEOF

wchar.h (ISO): End-Of-File and Errors.

wint_t WEOF

wchar.h (ISO): Introduction to Extended Characters.

int WEXITSTATUS (int status)

sys/wait.h (POSIX.1): Process Completion Status.

int WIFEXITED (int status)

sys/wait.h (POSIX.1): Process Completion Status.

int WIFSIGNALED (int status)

sys/wait.h (POSIX.1): Process Completion Status.

int WIFSTOPPED (int status)

sys/wait.h (POSIX.1): Process Completion Status.

WINT_WIDTH

stdint.h (ISO): Width of an Integer Type.

WRDE_APPEND

wordexp.h (POSIX.2): Flags for Word Expansion.

WRDE_BADCHAR

wordexp.h (POSIX.2): Calling wordexp.

WRDE_BADVAL

wordexp.h (POSIX.2): Calling wordexp.

WRDE_CMDSUB

wordexp.h (POSIX.2): Calling wordexp.

WRDE_DOOFFS

wordexp.h (POSIX.2): Flags for Word Expansion.

WRDE_NOCMD

wordexp.h (POSIX.2): Flags for Word Expansion.

WRDE_NOSPACE

wordexp.h (POSIX.2): Calling wordexp.

WRDE_REUSE

wordexp.h (POSIX.2): Flags for Word Expansion.

WRDE_SHOWERR

wordexp.h (POSIX.2): Flags for Word Expansion.

WRDE_SYNTAX

wordexp.h (POSIX.2): Calling wordexp.

WRDE_UNDEF

wordexp.h (POSIX.2): Flags for Word Expansion.

int WSTOPSIG (int status)

sys/wait.h (POSIX.1): Process Completion Status.

int WTERMSIG (int status)

sys/wait.h (POSIX.1): Process Completion Status.

int W_OK

unistd.h (POSIX.1): Testing Permission to Access a File.

int X_OK

unistd.h (POSIX.1): Testing Permission to Access a File.

_ATFILE_SOURCE

no header (GNU): Feature Test Macros.

_CS_LFS64_CFLAGS

unistd.h (Unix98): String-Valued Parameters.

_CS_LFS64_LDFLAGS

unistd.h (Unix98): String-Valued Parameters.

_CS_LFS64_LIBS

unistd.h (Unix98): String-Valued Parameters.

_CS_LFS64_LINTFLAGS

unistd.h (Unix98): String-Valued Parameters.

_CS_LFS_CFLAGS

unistd.h (Unix98): String-Valued Parameters.

_CS_LFS_LDFLAGS

unistd.h (Unix98): String-Valued Parameters.

_CS_LFS_LIBS

unistd.h (Unix98): String-Valued Parameters.

_CS_LFS_LINTFLAGS

unistd.h (Unix98): String-Valued Parameters.

_CS_PATH

unistd.h (POSIX.2): String-Valued Parameters.

const float complex _Complex_I

complex.h (C99): Complex Numbers.

_DEFAULT_SOURCE

no header (GNU): Feature Test Macros.

_DYNAMIC_STACK_SIZE_SOURCE

no header (GNU): Feature Test Macros.

void _Exit (int status)

stdlib.h (ISO): Termination Internals.

_FILE_OFFSET_BITS

no header (X/Open): Feature Test Macros.

_FORTIFY_SOURCE

no header (GNU): Feature Test Macros.

pid_t _Fork (void)

unistd.h (GNU): Creating a Process.

_GNU_SOURCE

no header (GNU): Feature Test Macros.

int _IOFBF

stdio.h (ISO): Controlling Which Kind of Buffering.

int _IOLBF

stdio.h (ISO): Controlling Which Kind of Buffering.

int _IONBF

stdio.h (ISO): Controlling Which Kind of Buffering.

_ISOC11_SOURCE

no header (C11): Feature Test Macros.

_ISOC2X_SOURCE

no header (C2X): Feature Test Macros.

_ISOC99_SOURCE

no header (GNU): Feature Test Macros.

_LARGEFILE64_SOURCE

no header (X/Open): Feature Test Macros.

_LARGEFILE_SOURCE

no header (X/Open): Feature Test Macros.

_PC_ASYNC_IO

unistd.h (POSIX.1): Using pathconf.

_PC_CHOWN_RESTRICTED

unistd.h (POSIX.1): Using pathconf.

_PC_FILESIZEBITS

unistd.h (LFS): Using pathconf.

_PC_LINK_MAX

unistd.h (POSIX.1): Using pathconf.

_PC_MAX_CANON

unistd.h (POSIX.1): Using pathconf.

_PC_MAX_INPUT

unistd.h (POSIX.1): Using pathconf.

_PC_NAME_MAX

unistd.h (POSIX.1): Using pathconf.

_PC_NO_TRUNC

unistd.h (POSIX.1): Using pathconf.

_PC_PATH_MAX

unistd.h (POSIX.1): Using pathconf.

_PC_PIPE_BUF

unistd.h (POSIX.1): Using pathconf.

_PC_PRIO_IO

unistd.h (POSIX.1): Using pathconf.

_PC_REC_INCR_XFER_SIZE

unistd.h (POSIX.1): Using pathconf.

_PC_REC_MAX_XFER_SIZE

unistd.h (POSIX.1): Using pathconf.

_PC_REC_MIN_XFER_SIZE

unistd.h (POSIX.1): Using pathconf.

_PC_REC_XFER_ALIGN

unistd.h (POSIX.1): Using pathconf.

_PC_SYNC_IO

unistd.h (POSIX.1): Using pathconf.

_PC_VDISABLE

unistd.h (POSIX.1): Using pathconf.

_POSIX2_BC_BASE_MAX

limits.h (POSIX.2): Minimum Values for Utility Limits.

_POSIX2_BC_DIM_MAX

limits.h (POSIX.2): Minimum Values for Utility Limits.

_POSIX2_BC_SCALE_MAX

limits.h (POSIX.2): Minimum Values for Utility Limits.

_POSIX2_BC_STRING_MAX

limits.h (POSIX.2): Minimum Values for Utility Limits.

_POSIX2_COLL_WEIGHTS_MAX

limits.h (POSIX.2): Minimum Values for Utility Limits.

int _POSIX2_C_DEV

unistd.h (POSIX.2): Overall System Options.

long int _POSIX2_C_VERSION

unistd.h (POSIX.2): Which Version of POSIX is Supported.

_POSIX2_EQUIV_CLASS_MAX

limits.h (POSIX.2): Minimum Values for Utility Limits.

_POSIX2_EXPR_NEST_MAX

limits.h (POSIX.2): Minimum Values for Utility Limits.

int _POSIX2_FORT_DEV

unistd.h (POSIX.2): Overall System Options.

int _POSIX2_FORT_RUN

unistd.h (POSIX.2): Overall System Options.

_POSIX2_LINE_MAX

limits.h (POSIX.2): Minimum Values for Utility Limits.

int _POSIX2_LOCALEDEF

unistd.h (POSIX.2): Overall System Options.

_POSIX2_RE_DUP_MAX

limits.h (POSIX.2): Minimum Values for General Capacity Limits.

int _POSIX2_SW_DEV

unistd.h (POSIX.2): Overall System Options.

_POSIX_AIO_LISTIO_MAX

limits.h (POSIX.1): Minimum Values for General Capacity Limits.

_POSIX_AIO_MAX

limits.h (POSIX.1): Minimum Values for General Capacity Limits.

_POSIX_ARG_MAX

limits.h (POSIX.1): Minimum Values for General Capacity Limits.

_POSIX_CHILD_MAX

limits.h (POSIX.1): Minimum Values for General Capacity Limits.

int _POSIX_CHOWN_RESTRICTED

unistd.h (POSIX.1): Optional Features in File Support.

_POSIX_C_SOURCE

no header (POSIX.2): Feature Test Macros.

int _POSIX_JOB_CONTROL

unistd.h (POSIX.1): Overall System Options.

_POSIX_LINK_MAX

limits.h (POSIX.1): Minimum Values for File System Limits.

_POSIX_MAX_CANON

limits.h (POSIX.1): Minimum Values for File System Limits.

_POSIX_MAX_INPUT

limits.h (POSIX.1): Minimum Values for File System Limits.

_POSIX_NAME_MAX

limits.h (POSIX.1): Minimum Values for File System Limits.

_POSIX_NGROUPS_MAX

limits.h (POSIX.1): Minimum Values for General Capacity Limits.

int _POSIX_NO_TRUNC

unistd.h (POSIX.1): Optional Features in File Support.

_POSIX_OPEN_MAX

limits.h (POSIX.1): Minimum Values for General Capacity Limits.

_POSIX_PATH_MAX

limits.h (POSIX.1): Minimum Values for File System Limits.

_POSIX_PIPE_BUF

limits.h (POSIX.1): Minimum Values for File System Limits.

int _POSIX_SAVED_IDS

unistd.h (POSIX.1): Overall System Options.

_POSIX_SOURCE

no header (POSIX.1): Feature Test Macros.

_POSIX_SSIZE_MAX

limits.h (POSIX.1): Minimum Values for General Capacity Limits.

_POSIX_STREAM_MAX

limits.h (POSIX.1): Minimum Values for General Capacity Limits.

_POSIX_TZNAME_MAX

limits.h (POSIX.1): Minimum Values for General Capacity Limits.

unsigned char _POSIX_VDISABLE

unistd.h (POSIX.1): Optional Features in File Support.

long int _POSIX_VERSION

unistd.h (POSIX.1): Which Version of POSIX is Supported.

_REENTRANT

no header (Obsolete): Feature Test Macros.

_SC_2_C_DEV

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_2_FORT_DEV

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_2_FORT_RUN

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_2_LOCALEDEF

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_2_SW_DEV

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_2_VERSION

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_AIO_LISTIO_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_AIO_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_AIO_PRIO_DELTA_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_ARG_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_ASYNCHRONOUS_IO

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_ATEXIT_MAX

unistd.h (GNU): Constants for sysconf Parameters.

_SC_AVPHYS_PAGES

unistd.h (GNU): Constants for sysconf Parameters.

_SC_BC_BASE_MAX

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_BC_DIM_MAX

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_BC_SCALE_MAX

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_BC_STRING_MAX

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_CHARCLASS_NAME_MAX

unistd.h (GNU): Constants for sysconf Parameters.

_SC_CHAR_BIT

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_CHAR_MAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_CHAR_MIN

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_CHILD_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_CLK_TCK

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_COLL_WEIGHTS_MAX

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_DELAYTIMER_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_EQUIV_CLASS_MAX

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_EXPR_NEST_MAX

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_FSYNC

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_GETGR_R_SIZE_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_GETPW_R_SIZE_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_INT_MAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_INT_MIN

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_JOB_CONTROL

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_LEVEL1_DCACHE_ASSOC

unistd.h (GNU): Constants for sysconf Parameters.

_SC_LEVEL1_DCACHE_LINESIZE

unistd.h (GNU): Constants for sysconf Parameters.

_SC_LEVEL1_DCACHE_SIZE

unistd.h (GNU): Constants for sysconf Parameters.

_SC_LEVEL1_ICACHE_ASSOC

unistd.h (GNU): Constants for sysconf Parameters.

_SC_LEVEL1_ICACHE_LINESIZE

unistd.h (GNU): Constants for sysconf Parameters.

_SC_LEVEL1_ICACHE_SIZE

unistd.h (GNU): Constants for sysconf Parameters.

_SC_LEVEL2_CACHE_ASSOC

unistd.h (GNU): Constants for sysconf Parameters.

_SC_LEVEL2_CACHE_LINESIZE

unistd.h (GNU): Constants for sysconf Parameters.

_SC_LEVEL2_CACHE_SIZE

unistd.h (GNU): Constants for sysconf Parameters.

_SC_LEVEL3_CACHE_ASSOC

unistd.h (GNU): Constants for sysconf Parameters.

_SC_LEVEL3_CACHE_LINESIZE

unistd.h (GNU): Constants for sysconf Parameters.

_SC_LEVEL3_CACHE_SIZE

unistd.h (GNU): Constants for sysconf Parameters.

_SC_LEVEL4_CACHE_ASSOC

unistd.h (GNU): Constants for sysconf Parameters.

_SC_LEVEL4_CACHE_LINESIZE

unistd.h (GNU): Constants for sysconf Parameters.

_SC_LEVEL4_CACHE_SIZE

unistd.h (GNU): Constants for sysconf Parameters.

_SC_LINE_MAX

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_LOGIN_NAME_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_LONG_BIT

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_MAPPED_FILES

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_MB_LEN_MAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_MEMLOCK

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_MEMLOCK_RANGE

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_MEMORY_PROTECTION

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_MESSAGE_PASSING

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_MINSIGSTKSZ

unistd.h (GNU): Constants for sysconf Parameters.

_SC_MQ_OPEN_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_MQ_PRIO_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_NGROUPS_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_NL_ARGMAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_NL_LANGMAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_NL_MSGMAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_NL_NMAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_NL_SETMAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_NL_TEXTMAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_NPROCESSORS_CONF

unistd.h (GNU): Constants for sysconf Parameters.

_SC_NPROCESSORS_ONLN

unistd.h (GNU): Constants for sysconf Parameters.

_SC_NZERO

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_OPEN_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_PAGESIZE

unistd.h (GNU): Constants for sysconf Parameters.

_SC_PHYS_PAGES

unistd.h (GNU): Constants for sysconf Parameters.

_SC_PII

unistd.h (POSIX.1g): Constants for sysconf Parameters.

_SC_PII_INTERNET

unistd.h (POSIX.1g): Constants for sysconf Parameters.

_SC_PII_INTERNET_DGRAM

unistd.h (POSIX.1g): Constants for sysconf Parameters.

_SC_PII_INTERNET_STREAM

unistd.h (POSIX.1g): Constants for sysconf Parameters.

_SC_PII_OSI

unistd.h (POSIX.1g): Constants for sysconf Parameters.

_SC_PII_OSI_CLTS

unistd.h (POSIX.1g): Constants for sysconf Parameters.

_SC_PII_OSI_COTS

unistd.h (POSIX.1g): Constants for sysconf Parameters.

_SC_PII_OSI_M

unistd.h (POSIX.1g): Constants for sysconf Parameters.

_SC_PII_SOCKET

unistd.h (POSIX.1g): Constants for sysconf Parameters.

_SC_PII_XTI

unistd.h (POSIX.1g): Constants for sysconf Parameters.

_SC_PRIORITIZED_IO

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_PRIORITY_SCHEDULING

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_REALTIME_SIGNALS

unistdh.h (POSIX.1): Constants for sysconf Parameters.

_SC_RTSIG_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_SAVED_IDS

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_SCHAR_MAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_SCHAR_MIN

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_SELECT

unistd.h (POSIX.1g): Constants for sysconf Parameters.

_SC_SEMAPHORES

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_SEM_NSEMS_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_SEM_VALUE_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_SHARED_MEMORY_OBJECTS

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_SHRT_MAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_SHRT_MIN

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_SIGQUEUE_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_SIGSTKSZ

unistd.h (GNU): Constants for sysconf Parameters.

_SC_SSIZE_MAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_STREAM_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_SYNCHRONIZED_IO

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_THREADS

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_THREAD_ATTR_STACKADDR

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_THREAD_ATTR_STACKSIZE

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_THREAD_DESTRUCTOR_ITERATIONS

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_THREAD_KEYS_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_THREAD_PRIORITY_SCHEDULING

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_THREAD_PRIO_INHERIT

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_THREAD_PRIO_PROTECT

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_THREAD_PROCESS_SHARED

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_THREAD_SAFE_FUNCTIONS

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_THREAD_STACK_MIN

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_THREAD_THREADS_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_TIMERS

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_TIMER_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_TTY_NAME_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_TZNAME_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_T_IOV_MAX

unistd.h (POSIX.1g): Constants for sysconf Parameters.

_SC_UCHAR_MAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_UINT_MAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_UIO_MAXIOV

unistd.h (POSIX.1g): Constants for sysconf Parameters.

_SC_ULONG_MAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_USHRT_MAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_VERSION

unistd.h (POSIX.1): Constants for sysconf Parameters.

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_WORD_BIT

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_XOPEN_CRYPT

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_XOPEN_ENH_I18N

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_XOPEN_LEGACY

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_XOPEN_REALTIME

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_XOPEN_REALTIME_THREADS

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_XOPEN_SHM

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_XOPEN_UNIX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_XOPEN_VERSION

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_XOPEN_XCU_VERSION

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_XOPEN_XPG2

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_XOPEN_XPG3

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_XOPEN_XPG4

unistd.h (X/Open): Constants for sysconf Parameters.

_THREAD_SAFE

no header (Obsolete): Feature Test Macros.

_XOPEN_SOURCE

no header (X/Open): Feature Test Macros.

_XOPEN_SOURCE_EXTENDED

no header (X/Open): Feature Test Macros.

__STDC_WANT_IEC_60559_BFP_EXT__

no header (ISO): Feature Test Macros.

__STDC_WANT_IEC_60559_EXT__

no header (ISO): Feature Test Macros.

__STDC_WANT_IEC_60559_FUNCS_EXT__

no header (ISO): Feature Test Macros.

__STDC_WANT_IEC_60559_TYPES_EXT__

no header (ISO): Feature Test Macros.

__STDC_WANT_LIB_EXT2__

no header (ISO): Feature Test Macros.

size_t __fbufsize (FILE *stream)

stdio_ext.h (GNU): Controlling Which Kind of Buffering.

int __flbf (FILE *stream)

stdio_ext.h (GNU): Controlling Which Kind of Buffering.

size_t __fpending (FILE *stream)

stdio_ext.h (GNU): Controlling Which Kind of Buffering.

void __fpurge (FILE *stream)

stdio_ext.h (GNU): Flushing Buffers.

int __freadable (FILE *stream)

stdio_ext.h (GNU): Opening Streams.

int __freading (FILE *stream)

stdio_ext.h (GNU): Opening Streams.

int __fsetlocking (FILE *stream, int type)

stdio_ext.h (GNU): Streams and Threads.

__ftw64_func_t

ftw.h (GNU): Working with Directory Trees.

__ftw_func_t

ftw.h (GNU): Working with Directory Trees.

int __fwritable (FILE *stream)

stdio_ext.h (GNU): Opening Streams.

int __fwriting (FILE *stream)

stdio_ext.h (GNU): Opening Streams.

void (*__gconv_end_fct) (struct gconv_step *)

gconv.h (GNU): The iconv Implementation in the GNU C Library.

int (*__gconv_fct) (struct __gconv_step *, struct __gconv_step_data *, const char **, const char *, size_t *, int)

gconv.h (GNU): The iconv Implementation in the GNU C Library.

int (*__gconv_init_fct) (struct __gconv_step *)

gconv.h (GNU): The iconv Implementation in the GNU C Library.

struct __gconv_step

gconv.h (GNU): The iconv Implementation in the GNU C Library.

struct __gconv_step_data

gconv.h (GNU): The iconv Implementation in the GNU C Library.

char __libc_single_threaded

sys/single_threaded.h (GNU): Detecting Single-Threaded Execution.

__nftw64_func_t

ftw.h (GNU): Working with Directory Trees.

__nftw_func_t

ftw.h (GNU): Working with Directory Trees.

unsigned int __rseq_flags

sys/rseq.h (Linux): Restartable Sequences.

ptrdiff_t __rseq_offset

sys/rseq.h (Linux): Restartable Sequences.

unsigned int __rseq_size

sys/rseq.h (Linux): Restartable Sequences.

void __va_copy (va_list dest, va_list src)

stdarg.h (GNU): Argument Access Macros.

int _dl_find_object (void *address, struct dl_find_object *result)

dlfcn.h (GNU): Dynamic Linker Introspection.

void _exit (int status)

unistd.h (POSIX.1): Termination Internals.

void _flushlbf (void)

stdio_ext.h (GNU): Flushing Buffers.

int _tolower (int c)

ctype.h (SVID): Case Conversion.

int _toupper (int c)

ctype.h (SVID): Case Conversion.

long int a64l (const char *string)

stdlib.h (XPG): Encode Binary Data.

void abort (void)

stdlib.h (ISO): Aborting a Program.

int abs (int number)

stdlib.h (ISO): Absolute Value.

int accept (int socket, struct sockaddr *addr, socklen_t *length_ptr)

sys/socket.h (BSD): Accepting Connections.

int access (const char *filename, int how)

unistd.h (POSIX.1): Testing Permission to Access a File.

double acos (double x)

math.h (ISO): Inverse Trigonometric Functions.

float acosf (float x)

math.h (ISO): Inverse Trigonometric Functions.

_FloatN acosfN (_FloatN x)

math.h (TS 18661-3:2015): Inverse Trigonometric Functions.

_FloatNx acosfNx (_FloatNx x)

math.h (TS 18661-3:2015): Inverse Trigonometric Functions.

double acosh (double x)

math.h (ISO): Hyperbolic Functions.

float acoshf (float x)

math.h (ISO): Hyperbolic Functions.

_FloatN acoshfN (_FloatN x)

math.h (TS 18661-3:2015): Hyperbolic Functions.

_FloatNx acoshfNx (_FloatNx x)

math.h (TS 18661-3:2015): Hyperbolic Functions.

long double acoshl (long double x)

math.h (ISO): Hyperbolic Functions.

long double acosl (long double x)

math.h (ISO): Inverse Trigonometric Functions.

int addmntent (FILE *stream, const struct mntent *mnt)

mntent.h (BSD): The mtab file.

int adjtime (const struct timeval *delta, struct timeval *olddelta)

sys/time.h (BSD): Setting and Adjusting the Time.

int adjtimex (struct timex *timex)

sys/timex.h (GNU): Setting and Adjusting the Time.

int aio_cancel (int fildes, struct aiocb *aiocbp)

aio.h (POSIX.1b): Cancellation of AIO Operations.

int aio_cancel64 (int fildes, struct aiocb64 *aiocbp)

aio.h (Unix98): Cancellation of AIO Operations.

int aio_error (const struct aiocb *aiocbp)

aio.h (POSIX.1b): Getting the Status of AIO Operations.

int aio_error64 (const struct aiocb64 *aiocbp)

aio.h (Unix98): Getting the Status of AIO Operations.

int aio_fsync (int op, struct aiocb *aiocbp)

aio.h (POSIX.1b): Getting into a Consistent State.

int aio_fsync64 (int op, struct aiocb64 *aiocbp)

aio.h (Unix98): Getting into a Consistent State.

void aio_init (const struct aioinit *init)

aio.h (GNU): How to optimize the AIO implementation.

int aio_read (struct aiocb *aiocbp)

aio.h (POSIX.1b): Asynchronous Read and Write Operations.

int aio_read64 (struct aiocb64 *aiocbp)

aio.h (Unix98): Asynchronous Read and Write Operations.

ssize_t aio_return (struct aiocb *aiocbp)

aio.h (POSIX.1b): Getting the Status of AIO Operations.

ssize_t aio_return64 (struct aiocb64 *aiocbp)

aio.h (Unix98): Getting the Status of AIO Operations.

int aio_suspend (const struct aiocb *const list[], int nent, const struct timespec *timeout)

aio.h (POSIX.1b): Getting into a Consistent State.

int aio_suspend64 (const struct aiocb64 *const list[], int nent, const struct timespec *timeout)

aio.h (Unix98): Getting into a Consistent State.

int aio_write (struct aiocb *aiocbp)

aio.h (POSIX.1b): Asynchronous Read and Write Operations.

int aio_write64 (struct aiocb64 *aiocbp)

aio.h (Unix98): Asynchronous Read and Write Operations.

struct aiocb

aio.h (POSIX.1b): Perform I/O Operations in Parallel.

struct aiocb64

aio.h (POSIX.1b): Perform I/O Operations in Parallel.

struct aioinit

aio.h (GNU): How to optimize the AIO implementation.

unsigned int alarm (unsigned int seconds)

unistd.h (POSIX.1): Setting an Alarm.

void * aligned_alloc (size_t alignment, size_t size)

stdlib.h (???): Allocating Aligned Memory Blocks.

void * alloca (size_t size)

stdlib.h (GNU): Automatic Storage with Variable Size.

stdlib.h (BSD): Automatic Storage with Variable Size.

int alphasort (const struct dirent **a, const struct dirent **b)

dirent.h (BSD): Scanning the Content of a Directory.

dirent.h (SVID): Scanning the Content of a Directory.

int alphasort64 (const struct dirent64 **a, const struct dirent **b)

dirent.h (GNU): Scanning the Content of a Directory.

uint32_t arc4random (void)

stdlib.h (BSD): High Quality Random Number Functions.

void arc4random_buf (void *buffer, size_t length)

stdlib.h (BSD): High Quality Random Number Functions.

uint32_t arc4random_uniform (uint32_t upper_bound)

stdlib.h (BSD): High Quality Random Number Functions.

struct argp

argp.h (GNU): Specifying Argp Parsers.

struct argp_child

argp.h (GNU): Combining Multiple Argp Parsers.

error_t argp_err_exit_status

argp.h (GNU): Argp Global Variables.

void argp_error (const struct argp_state *state, const char *fmt, …)

argp.h (GNU): Functions For Use in Argp Parsers.

void argp_failure (const struct argp_state *state, int status, int errnum, const char *fmt, …)

argp.h (GNU): Functions For Use in Argp Parsers.

void argp_help (const struct argp *argp, FILE *stream, unsigned flags, char *name)

argp.h (GNU): The argp_help Function.

struct argp_option

argp.h (GNU): Specifying Options in an Argp Parser.

error_t argp_parse (const struct argp *argp, int argc, char **argv, unsigned flags, int *arg_index, void *input)

argp.h (GNU): Parsing Program Options with Argp.

const char * argp_program_bug_address

argp.h (GNU): Argp Global Variables.

const char * argp_program_version

argp.h (GNU): Argp Global Variables.

argp_program_version_hook

argp.h (GNU): Argp Global Variables.

struct argp_state

argp.h (GNU): Argp Parsing State.

void argp_state_help (const struct argp_state *state, FILE *stream, unsigned flags)

argp.h (GNU): Functions For Use in Argp Parsers.

void argp_usage (const struct argp_state *state)

argp.h (GNU): Functions For Use in Argp Parsers.

error_t argz_add (char **argz, size_t *argz_len, const char *str)

argz.h (GNU): Argz Functions.

error_t argz_add_sep (char **argz, size_t *argz_len, const char *str, int delim)

argz.h (GNU): Argz Functions.

error_t argz_append (char **argz, size_t *argz_len, const char *buf, size_t buf_len)

argz.h (GNU): Argz Functions.

size_t argz_count (const char *argz, size_t argz_len)

argz.h (GNU): Argz Functions.

error_t argz_create (char *const argv[], char **argz, size_t *argz_len)

argz.h (GNU): Argz Functions.

error_t argz_create_sep (const char *string, int sep, char **argz, size_t *argz_len)

argz.h (GNU): Argz Functions.

void argz_delete (char **argz, size_t *argz_len, char *entry)

argz.h (GNU): Argz Functions.

void argz_extract (const char *argz, size_t argz_len, char **argv)

argz.h (GNU): Argz Functions.

error_t argz_insert (char **argz, size_t *argz_len, char *before, const char *entry)

argz.h (GNU): Argz Functions.

char * argz_next (const char *argz, size_t argz_len, const char *entry)

argz.h (GNU): Argz Functions.

error_t argz_replace (char **argz, size_t *argz_len, const char *str, const char *with, unsigned *replace_count)

argz.h (GNU): Argz Functions.

void argz_stringify (char *argz, size_t len, int sep)

argz.h (GNU): Argz Functions.

char * asctime (const struct tm *brokentime)

time.h (ISO): Formatting Calendar Time.

char * asctime_r (const struct tm *brokentime, char *buffer)

time.h (POSIX.1c): Formatting Calendar Time.

double asin (double x)

math.h (ISO): Inverse Trigonometric Functions.

float asinf (float x)

math.h (ISO): Inverse Trigonometric Functions.

_FloatN asinfN (_FloatN x)

math.h (TS 18661-3:2015): Inverse Trigonometric Functions.

_FloatNx asinfNx (_FloatNx x)

math.h (TS 18661-3:2015): Inverse Trigonometric Functions.

double asinh (double x)

math.h (ISO): Hyperbolic Functions.

float asinhf (float x)

math.h (ISO): Hyperbolic Functions.

_FloatN asinhfN (_FloatN x)

math.h (TS 18661-3:2015): Hyperbolic Functions.

_FloatNx asinhfNx (_FloatNx x)

math.h (TS 18661-3:2015): Hyperbolic Functions.

long double asinhl (long double x)

math.h (ISO): Hyperbolic Functions.

long double asinl (long double x)

math.h (ISO): Inverse Trigonometric Functions.

int asprintf (char **ptr, const char *template, …)

stdio.h (GNU): Dynamically Allocating Formatted Output.

void assert (int expression)

assert.h (ISO): Explicitly Checking Internal Consistency.

void assert_perror (int errnum)

assert.h (GNU): Explicitly Checking Internal Consistency.

double atan (double x)

math.h (ISO): Inverse Trigonometric Functions.

double atan2 (double y, double x)

math.h (ISO): Inverse Trigonometric Functions.

float atan2f (float y, float x)

math.h (ISO): Inverse Trigonometric Functions.

_FloatN atan2fN (_FloatN y, _FloatN x)

math.h (TS 18661-3:2015): Inverse Trigonometric Functions.

_FloatNx atan2fNx (_FloatNx y, _FloatNx x)

math.h (TS 18661-3:2015): Inverse Trigonometric Functions.

long double atan2l (long double y, long double x)

math.h (ISO): Inverse Trigonometric Functions.

float atanf (float x)

math.h (ISO): Inverse Trigonometric Functions.

_FloatN atanfN (_FloatN x)

math.h (TS 18661-3:2015): Inverse Trigonometric Functions.

_FloatNx atanfNx (_FloatNx x)

math.h (TS 18661-3:2015): Inverse Trigonometric Functions.

double atanh (double x)

math.h (ISO): Hyperbolic Functions.

float atanhf (float x)

math.h (ISO): Hyperbolic Functions.

_FloatN atanhfN (_FloatN x)

math.h (TS 18661-3:2015): Hyperbolic Functions.

_FloatNx atanhfNx (_FloatNx x)

math.h (TS 18661-3:2015): Hyperbolic Functions.

long double atanhl (long double x)

math.h (ISO): Hyperbolic Functions.

long double atanl (long double x)

math.h (ISO): Inverse Trigonometric Functions.

int atexit (void (*function) (void))

stdlib.h (ISO): Cleanups on Exit.

double atof (const char *string)

stdlib.h (ISO): Parsing of Floats.

int atoi (const char *string)

stdlib.h (ISO): Parsing of Integers.

long int atol (const char *string)

stdlib.h (ISO): Parsing of Integers.

long long int atoll (const char *string)

stdlib.h (ISO): Parsing of Integers.

int backtrace (void **buffer, int size)

execinfo.h (GNU): Backtraces.

char ** backtrace_symbols (void *const *buffer, int size)

execinfo.h (GNU): Backtraces.

void backtrace_symbols_fd (void *const *buffer, int size, int fd)

execinfo.h (GNU): Backtraces.

char * basename (char *path)

libgen.h (XPG): Finding Tokens in a String.

char * basename (const char *filename)

string.h (GNU): Finding Tokens in a String.

int bcmp (const void *a1, const void *a2, size_t size)

string.h (BSD): String/Array Comparison.

void bcopy (const void *from, void *to, size_t size)

string.h (BSD): Copying Strings and Arrays.

int bind (int socket, struct sockaddr *addr, socklen_t length)

sys/socket.h (BSD): Setting the Address of a Socket.

char * bind_textdomain_codeset (const char *domainname, const char *codeset)

libintl.h (GNU): How to specify the output character set gettext uses.

char * bindtextdomain (const char *domainname, const char *dirname)

libintl.h (GNU): How to determine which catalog to be used.

blkcnt64_t

sys/types.h (Unix98): The meaning of the File Attributes.

blkcnt_t

sys/types.h (Unix98): The meaning of the File Attributes.

int brk (void *addr)

unistd.h (BSD): Resizing the Data Segment.

void * bsearch (const void *key, const void *array, size_t count, size_t size, comparison_fn_t compare)

stdlib.h (ISO): Array Search Function.

wint_t btowc (int c)

wchar.h (ISO): Converting Single Characters.

void bzero (void *block, size_t size)

string.h (BSD): Copying Strings and Arrays.

double cabs (complex double z)

complex.h (ISO): Absolute Value.

float cabsf (complex float z)

complex.h (ISO): Absolute Value.

_FloatN cabsfN (complex _FloatN z)

complex.h (TS 18661-3:2015): Absolute Value.

_FloatNx cabsfNx (complex _FloatNx z)

complex.h (TS 18661-3:2015): Absolute Value.

long double cabsl (complex long double z)

complex.h (ISO): Absolute Value.

complex double cacos (complex double z)

complex.h (ISO): Inverse Trigonometric Functions.

complex float cacosf (complex float z)

complex.h (ISO): Inverse Trigonometric Functions.

complex _FloatN cacosfN (complex _FloatN z)

complex.h (TS 18661-3:2015): Inverse Trigonometric Functions.

complex _FloatNx cacosfNx (complex _FloatNx z)

complex.h (TS 18661-3:2015): Inverse Trigonometric Functions.

complex double cacosh (complex double z)

complex.h (ISO): Hyperbolic Functions.

complex float cacoshf (complex float z)

complex.h (ISO): Hyperbolic Functions.

complex _FloatN cacoshfN (complex _FloatN z)

complex.h (TS 18661-3:2015): Hyperbolic Functions.

complex _FloatNx cacoshfNx (complex _FloatNx z)

complex.h (TS 18661-3:2015): Hyperbolic Functions.

complex long double cacoshl (complex long double z)

complex.h (ISO): Hyperbolic Functions.

complex long double cacosl (complex long double z)

complex.h (ISO): Inverse Trigonometric Functions.

void call_once (once_flag *flag, void (*func) (void))

threads.h (C11): Call Once.

void * calloc (size_t count, size_t eltsize)

malloc.h (ISO): Allocating Cleared Space.

stdlib.h (ISO): Allocating Cleared Space.

int canonicalize (double *cx, const double *x)

math.h (ISO): Setting and modifying single bits of FP values.

char * canonicalize_file_name (const char *name)

stdlib.h (GNU): Symbolic Links.

int canonicalizef (float *cx, const float *x)

math.h (ISO): Setting and modifying single bits of FP values.

int canonicalizefN (_FloatN *cx, const _FloatN *x)

math.h (TS 18661-3:2015): Setting and modifying single bits of FP values.

int canonicalizefNx (_FloatNx *cx, const _FloatNx *x)

math.h (TS 18661-3:2015): Setting and modifying single bits of FP values.

int canonicalizel (long double *cx, const long double *x)

math.h (ISO): Setting and modifying single bits of FP values.

double carg (complex double z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

float cargf (complex float z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

_FloatN cargfN (complex _FloatN z)

complex.h (TS 18661-3:2015): Projections, Conjugates, and Decomposing of Complex Numbers.

_FloatNx cargfNx (complex _FloatNx z)

complex.h (TS 18661-3:2015): Projections, Conjugates, and Decomposing of Complex Numbers.

long double cargl (complex long double z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

complex double casin (complex double z)

complex.h (ISO): Inverse Trigonometric Functions.

complex float casinf (complex float z)

complex.h (ISO): Inverse Trigonometric Functions.

complex _FloatN casinfN (complex _FloatN z)

complex.h (TS 18661-3:2015): Inverse Trigonometric Functions.

complex _FloatNx casinfNx (complex _FloatNx z)

complex.h (TS 18661-3:2015): Inverse Trigonometric Functions.

complex double casinh (complex double z)

complex.h (ISO): Hyperbolic Functions.

complex float casinhf (complex float z)

complex.h (ISO): Hyperbolic Functions.

complex _FloatN casinhfN (complex _FloatN z)

complex.h (TS 18661-3:2015): Hyperbolic Functions.

complex _FloatNx casinhfNx (complex _FloatNx z)

complex.h (TS 18661-3:2015): Hyperbolic Functions.

complex long double casinhl (complex long double z)

complex.h (ISO): Hyperbolic Functions.

complex long double casinl (complex long double z)

complex.h (ISO): Inverse Trigonometric Functions.

complex double catan (complex double z)

complex.h (ISO): Inverse Trigonometric Functions.

complex float catanf (complex float z)

complex.h (ISO): Inverse Trigonometric Functions.

complex _FloatN catanfN (complex _FloatN z)

complex.h (TS 18661-3:2015): Inverse Trigonometric Functions.

complex _FloatNx catanfNx (complex _FloatNx z)

complex.h (TS 18661-3:2015): Inverse Trigonometric Functions.

complex double catanh (complex double z)

complex.h (ISO): Hyperbolic Functions.

complex float catanhf (complex float z)

complex.h (ISO): Hyperbolic Functions.

complex _FloatN catanhfN (complex _FloatN z)

complex.h (TS 18661-3:2015): Hyperbolic Functions.

complex _FloatNx catanhfNx (complex _FloatNx z)

complex.h (TS 18661-3:2015): Hyperbolic Functions.

complex long double catanhl (complex long double z)

complex.h (ISO): Hyperbolic Functions.

complex long double catanl (complex long double z)

complex.h (ISO): Inverse Trigonometric Functions.

nl_catd catopen (const char *cat_name, int flag)

nl_types.h (X/Open): The catgets function family.

double cbrt (double x)

math.h (BSD): Exponentiation and Logarithms.

float cbrtf (float x)

math.h (BSD): Exponentiation and Logarithms.

_FloatN cbrtfN (_FloatN x)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

_FloatNx cbrtfNx (_FloatNx x)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

long double cbrtl (long double x)

math.h (BSD): Exponentiation and Logarithms.

cc_t

termios.h (POSIX.1): Terminal Mode Data Types.

complex double ccos (complex double z)

complex.h (ISO): Trigonometric Functions.

complex float ccosf (complex float z)

complex.h (ISO): Trigonometric Functions.

complex _FloatN ccosfN (complex _FloatN z)

complex.h (TS 18661-3:2015): Trigonometric Functions.

complex _FloatNx ccosfNx (complex _FloatNx z)

complex.h (TS 18661-3:2015): Trigonometric Functions.

complex double ccosh (complex double z)

complex.h (ISO): Hyperbolic Functions.

complex float ccoshf (complex float z)

complex.h (ISO): Hyperbolic Functions.

complex _FloatN ccoshfN (complex _FloatN z)

complex.h (TS 18661-3:2015): Hyperbolic Functions.

complex _FloatNx ccoshfNx (complex _FloatNx z)

complex.h (TS 18661-3:2015): Hyperbolic Functions.

complex long double ccoshl (complex long double z)

complex.h (ISO): Hyperbolic Functions.

complex long double ccosl (complex long double z)

complex.h (ISO): Trigonometric Functions.

double ceil (double x)

math.h (ISO): Rounding Functions.

float ceilf (float x)

math.h (ISO): Rounding Functions.

_FloatN ceilfN (_FloatN x)

math.h (TS 18661-3:2015): Rounding Functions.

_FloatNx ceilfNx (_FloatNx x)

math.h (TS 18661-3:2015): Rounding Functions.

long double ceill (long double x)

math.h (ISO): Rounding Functions.

complex double cexp (complex double z)

complex.h (ISO): Exponentiation and Logarithms.

complex float cexpf (complex float z)

complex.h (ISO): Exponentiation and Logarithms.

complex _FloatN cexpfN (complex _FloatN z)

complex.h (TS 18661-3:2015): Exponentiation and Logarithms.

complex _FloatNx cexpfNx (complex _FloatNx z)

complex.h (TS 18661-3:2015): Exponentiation and Logarithms.

complex long double cexpl (complex long double z)

complex.h (ISO): Exponentiation and Logarithms.

speed_t cfgetispeed (const struct termios *termios-p)

termios.h (POSIX.1): Line Speed.

speed_t cfgetospeed (const struct termios *termios-p)

termios.h (POSIX.1): Line Speed.

void cfmakeraw (struct termios *termios-p)

termios.h (BSD): Noncanonical Input.

int cfsetispeed (struct termios *termios-p, speed_t speed)

termios.h (POSIX.1): Line Speed.

int cfsetospeed (struct termios *termios-p, speed_t speed)

termios.h (POSIX.1): Line Speed.

int cfsetspeed (struct termios *termios-p, speed_t speed)

termios.h (BSD): Line Speed.

int chdir (const char *filename)

unistd.h (POSIX.1): Working Directory.

int chmod (const char *filename, mode_t mode)

sys/stat.h (POSIX.1): Assigning File Permissions.

int chown (const char *filename, uid_t owner, gid_t group)

unistd.h (POSIX.1): File Owner.

double cimag (complex double z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

float cimagf (complex float z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

_FloatN cimagfN (complex _FloatN z)

complex.h (TS 18661-3:2015): Projections, Conjugates, and Decomposing of Complex Numbers.

_FloatNx cimagfNx (complex _FloatNx z)

complex.h (TS 18661-3:2015): Projections, Conjugates, and Decomposing of Complex Numbers.

long double cimagl (complex long double z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

int clearenv (void)

stdlib.h (GNU): Environment Access.

void clearerr (FILE *stream)

stdio.h (ISO): Recovering from errors.

void clearerr_unlocked (FILE *stream)

stdio.h (GNU): Recovering from errors.

clock_t clock (void)

time.h (ISO): CPU Time Inquiry.

int clock_getres (clockid_t clock, struct timespec *res)

time.h (POSIX.1): Getting the Time.

int clock_gettime (clockid_t clock, struct timespec *ts)

time.h (POSIX.1): Getting the Time.

int clock_settime (clockid_t clock, const struct timespec *ts)

time.h (POSIX): Setting and Adjusting the Time.

clock_t

time.h (ISO): Time Types.

clockid_t

time.h (POSIX.1): Getting the Time.

complex double clog (complex double z)

complex.h (ISO): Exponentiation and Logarithms.

complex double clog10 (complex double z)

complex.h (GNU): Exponentiation and Logarithms.

complex float clog10f (complex float z)

complex.h (GNU): Exponentiation and Logarithms.

complex _FloatN clog10fN (complex _FloatN z)

complex.h (GNU): Exponentiation and Logarithms.

complex _FloatNx clog10fNx (complex _FloatNx z)

complex.h (GNU): Exponentiation and Logarithms.

complex long double clog10l (complex long double z)

complex.h (GNU): Exponentiation and Logarithms.

complex float clogf (complex float z)

complex.h (ISO): Exponentiation and Logarithms.

complex _FloatN clogfN (complex _FloatN z)

complex.h (TS 18661-3:2015): Exponentiation and Logarithms.

complex _FloatNx clogfNx (complex _FloatNx z)

complex.h (TS 18661-3:2015): Exponentiation and Logarithms.

complex long double clogl (complex long double z)

complex.h (ISO): Exponentiation and Logarithms.

int close (int filedes)

unistd.h (POSIX.1): Opening and Closing Files.

int close_range (unsigned int lowfd, unsigned int maxfd, int flags)

unistd.h (Linux): Opening and Closing Files.

int closedir (DIR *dirstream)

dirent.h (POSIX.1): Reading and Closing a Directory Stream.

void closefrom (int lowfd)

unistd.h (GNU): Opening and Closing Files.

void closelog (void)

syslog.h (BSD): closelog.

int cnd_broadcast (cnd_t *cond)

threads.h (C11): Condition Variables.

void cnd_destroy (cnd_t *cond)

threads.h (C11): Condition Variables.

int cnd_init (cnd_t *cond)

threads.h (C11): Condition Variables.

int cnd_signal (cnd_t *cond)

threads.h (C11): Condition Variables.

cnd_t

threads.h (C11): Condition Variables.

int cnd_timedwait (cnd_t *restrict cond, mtx_t *restrict mutex, const struct timespec *restrict time_point)

threads.h (C11): Condition Variables.

int cnd_wait (cnd_t *cond, mtx_t *mutex)

threads.h (C11): Condition Variables.

size_t confstr (int parameter, char *buf, size_t len)

unistd.h (POSIX.2): String-Valued Parameters.

complex double conj (complex double z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

complex float conjf (complex float z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

complex _FloatN conjfN (complex _FloatN z)

complex.h (TS 18661-3:2015): Projections, Conjugates, and Decomposing of Complex Numbers.

complex _FloatNx conjfNx (complex _FloatNx z)

complex.h (TS 18661-3:2015): Projections, Conjugates, and Decomposing of Complex Numbers.

complex long double conjl (complex long double z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

int connect (int socket, struct sockaddr *addr, socklen_t length)

sys/socket.h (BSD): Making a Connection.

cookie_close_function_t

stdio.h (GNU): Custom Stream Hook Functions.

cookie_io_functions_t

stdio.h (GNU): Custom Streams and Cookies.

cookie_read_function_t

stdio.h (GNU): Custom Stream Hook Functions.

cookie_seek_function_t

stdio.h (GNU): Custom Stream Hook Functions.

cookie_write_function_t

stdio.h (GNU): Custom Stream Hook Functions.

ssize_t copy_file_range (int inputfd, off64_t *inputpos, int outputfd, off64_t *outputpos, ssize_t length, unsigned int flags)

unistd.h (GNU): Copying data between two files.

double copysign (double x, double y)

math.h (ISO): Setting and modifying single bits of FP values.

float copysignf (float x, float y)

math.h (ISO): Setting and modifying single bits of FP values.

_FloatN copysignfN (_FloatN x, _FloatN y)

math.h (TS 18661-3:2015): Setting and modifying single bits of FP values.

_FloatNx copysignfNx (_FloatNx x, _FloatNx y)

math.h (TS 18661-3:2015): Setting and modifying single bits of FP values.

long double copysignl (long double x, long double y)

math.h (ISO): Setting and modifying single bits of FP values.

double cos (double x)

math.h (ISO): Trigonometric Functions.

float cosf (float x)

math.h (ISO): Trigonometric Functions.

_FloatN cosfN (_FloatN x)

math.h (TS 18661-3:2015): Trigonometric Functions.

_FloatNx cosfNx (_FloatNx x)

math.h (TS 18661-3:2015): Trigonometric Functions.

double cosh (double x)

math.h (ISO): Hyperbolic Functions.

float coshf (float x)

math.h (ISO): Hyperbolic Functions.

_FloatN coshfN (_FloatN x)

math.h (TS 18661-3:2015): Hyperbolic Functions.

_FloatNx coshfNx (_FloatNx x)

math.h (TS 18661-3:2015): Hyperbolic Functions.

long double coshl (long double x)

math.h (ISO): Hyperbolic Functions.

long double cosl (long double x)

math.h (ISO): Trigonometric Functions.

complex double cpow (complex double base, complex double power)

complex.h (ISO): Exponentiation and Logarithms.

complex float cpowf (complex float base, complex float power)

complex.h (ISO): Exponentiation and Logarithms.

complex _FloatN cpowfN (complex _FloatN base, complex _FloatN power)

complex.h (TS 18661-3:2015): Exponentiation and Logarithms.

complex _FloatNx cpowfNx (complex _FloatNx base, complex _FloatNx power)

complex.h (TS 18661-3:2015): Exponentiation and Logarithms.

complex long double cpowl (complex long double base, complex long double power)

complex.h (ISO): Exponentiation and Logarithms.

complex double cproj (complex double z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

complex float cprojf (complex float z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

complex _FloatN cprojfN (complex _FloatN z)

complex.h (TS 18661-3:2015): Projections, Conjugates, and Decomposing of Complex Numbers.

complex _FloatNx cprojfNx (complex _FloatNx z)

complex.h (TS 18661-3:2015): Projections, Conjugates, and Decomposing of Complex Numbers.

complex long double cprojl (complex long double z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

cpu_set_t

sched.h (GNU): Limiting execution to certain CPUs.

double creal (complex double z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

float crealf (complex float z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

_FloatN crealfN (complex _FloatN z)

complex.h (TS 18661-3:2015): Projections, Conjugates, and Decomposing of Complex Numbers.

_FloatNx crealfNx (complex _FloatNx z)

complex.h (TS 18661-3:2015): Projections, Conjugates, and Decomposing of Complex Numbers.

long double creall (complex long double z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

int creat (const char *filename, mode_t mode)

fcntl.h (POSIX.1): Opening and Closing Files.

int creat64 (const char *filename, mode_t mode)

fcntl.h (Unix98): Opening and Closing Files.

complex double csin (complex double z)

complex.h (ISO): Trigonometric Functions.

complex float csinf (complex float z)

complex.h (ISO): Trigonometric Functions.

complex _FloatN csinfN (complex _FloatN z)

complex.h (TS 18661-3:2015): Trigonometric Functions.

complex _FloatNx csinfNx (complex _FloatNx z)

complex.h (TS 18661-3:2015): Trigonometric Functions.

complex double csinh (complex double z)

complex.h (ISO): Hyperbolic Functions.

complex float csinhf (complex float z)

complex.h (ISO): Hyperbolic Functions.

complex _FloatN csinhfN (complex _FloatN z)

complex.h (TS 18661-3:2015): Hyperbolic Functions.

complex _FloatNx csinhfNx (complex _FloatNx z)

complex.h (TS 18661-3:2015): Hyperbolic Functions.

complex long double csinhl (complex long double z)

complex.h (ISO): Hyperbolic Functions.

complex long double csinl (complex long double z)

complex.h (ISO): Trigonometric Functions.

complex double csqrt (complex double z)

complex.h (ISO): Exponentiation and Logarithms.

complex float csqrtf (complex float z)

complex.h (ISO): Exponentiation and Logarithms.

complex _FloatN csqrtfN (_FloatN z)

complex.h (TS 18661-3:2015): Exponentiation and Logarithms.

complex _FloatNx csqrtfNx (complex _FloatNx z)

complex.h (TS 18661-3:2015): Exponentiation and Logarithms.

complex long double csqrtl (complex long double z)

complex.h (ISO): Exponentiation and Logarithms.

complex double ctan (complex double z)

complex.h (ISO): Trigonometric Functions.

complex float ctanf (complex float z)

complex.h (ISO): Trigonometric Functions.

complex _FloatN ctanfN (complex _FloatN z)

complex.h (TS 18661-3:2015): Trigonometric Functions.

complex _FloatNx ctanfNx (complex _FloatNx z)

complex.h (TS 18661-3:2015): Trigonometric Functions.

complex double ctanh (complex double z)

complex.h (ISO): Hyperbolic Functions.

complex float ctanhf (complex float z)

complex.h (ISO): Hyperbolic Functions.

complex _FloatN ctanhfN (complex _FloatN z)

complex.h (TS 18661-3:2015): Hyperbolic Functions.

complex _FloatNx ctanhfNx (complex _FloatNx z)

complex.h (TS 18661-3:2015): Hyperbolic Functions.

complex long double ctanhl (complex long double z)

complex.h (ISO): Hyperbolic Functions.

complex long double ctanl (complex long double z)

complex.h (ISO): Trigonometric Functions.

char * ctermid (char *string)

stdio.h (POSIX.1): Identifying the Controlling Terminal.

char * ctime (const time_t *time)

time.h (ISO): Formatting Calendar Time.

char * ctime_r (const time_t *time, char *buffer)

time.h (POSIX.1c): Formatting Calendar Time.

char * cuserid (char *string)

stdio.h (POSIX.1): Identifying Who Logged In.

double daddl (long double x, long double y)

math.h (TS 18661-1:2014): Miscellaneous FP arithmetic functions.

int daylight

time.h (SVID): Functions and Variables for Time Zones.

char * dcgettext (const char *domainname, const char *msgid, int category)

libintl.h (GNU): What has to be done to translate a message?.

char * dcngettext (const char *domain, const char *msgid1, const char *msgid2, unsigned long int n, int category)

libintl.h (GNU): Additional functions for more complicated situations.

double ddivl (long double x, long double y)

math.h (TS 18661-1:2014): Miscellaneous FP arithmetic functions.

dev_t

sys/types.h (POSIX.1): The meaning of the File Attributes.

double dfmal (long double x, long double y, long double z)

math.h (TS 18661-1:2014): Miscellaneous FP arithmetic functions.

char * dgettext (const char *domainname, const char *msgid)

libintl.h (GNU): What has to be done to translate a message?.

double difftime (time_t end, time_t begin)

time.h (ISO): Calculating Elapsed Time.

struct dirent

dirent.h (POSIX.1): Format of a Directory Entry.

int dirfd (DIR *dirstream)

dirent.h (GNU): Opening a Directory Stream.

char * dirname (char *path)

libgen.h (XPG): Finding Tokens in a String.

div_t div (int numerator, int denominator)

stdlib.h (ISO): Integer Division.

div_t

stdlib.h (ISO): Integer Division.

struct dl_find_object

dlfcn.h (GNU): Dynamic Linker Introspection.

double dmull (long double x, long double y)

math.h (TS 18661-1:2014): Miscellaneous FP arithmetic functions.

char * dngettext (const char *domain, const char *msgid1, const char *msgid2, unsigned long int n)

libintl.h (GNU): Additional functions for more complicated situations.

double drand48 (void)

stdlib.h (SVID): SVID Random Number Function.

int drand48_r (struct drand48_data *buffer, double *result)

stdlib.h (GNU): SVID Random Number Function.

double drem (double numerator, double denominator)

math.h (BSD): Remainder Functions.

float dremf (float numerator, float denominator)

math.h (BSD): Remainder Functions.

long double dreml (long double numerator, long double denominator)

math.h (BSD): Remainder Functions.

double dsqrtl (long double x)

math.h (TS 18661-1:2014): Miscellaneous FP arithmetic functions.

double dsubl (long double x, long double y)

math.h (TS 18661-1:2014): Miscellaneous FP arithmetic functions.

int dup (int old)

unistd.h (POSIX.1): Duplicating Descriptors.

int dup2 (int old, int new)

unistd.h (POSIX.1): Duplicating Descriptors.

char * ecvt (double value, int ndigit, int *decpt, int *neg)

stdlib.h (SVID): Old-fashioned System V number-to-string functions.

stdlib.h (Unix98): Old-fashioned System V number-to-string functions.

int ecvt_r (double value, int ndigit, int *decpt, int *neg, char *buf, size_t len)

stdlib.h (GNU): Old-fashioned System V number-to-string functions.

void endfsent (void)

fstab.h (BSD): The fstab file.

void endgrent (void)

grp.h (SVID): Scanning the List of All Groups.

grp.h (BSD): Scanning the List of All Groups.

void endhostent (void)

netdb.h (BSD): Host Names.

int endmntent (FILE *stream)

mntent.h (BSD): The mtab file.

void endnetent (void)

netdb.h (BSD): Networks Database.

void endnetgrent (void)

netdb.h (BSD): Looking up one Netgroup.

void endprotoent (void)

netdb.h (BSD): Protocols Database.

void endpwent (void)

pwd.h (SVID): Scanning the List of All Users.

pwd.h (BSD): Scanning the List of All Users.

void endservent (void)

netdb.h (BSD): The Services Database.

void endutent (void)

utmp.h (SVID): Manipulating the User Accounting Database.

void endutxent (void)

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

char ** environ

unistd.h (POSIX.1): Environment Access.

error_t envz_add (char **envz, size_t *envz_len, const char *name, const char *value)

envz.h (GNU): Envz Functions.

char * envz_entry (const char *envz, size_t envz_len, const char *name)

envz.h (GNU): Envz Functions.

char * envz_get (const char *envz, size_t envz_len, const char *name)

envz.h (GNU): Envz Functions.

error_t envz_merge (char **envz, size_t *envz_len, const char *envz2, size_t envz2_len, int override)

envz.h (GNU): Envz Functions.

void envz_remove (char **envz, size_t *envz_len, const char *name)

envz.h (GNU): Envz Functions.

void envz_strip (char **envz, size_t *envz_len)

envz.h (GNU): Envz Functions.

double erand48 (unsigned short int xsubi[3])

stdlib.h (SVID): SVID Random Number Function.

int erand48_r (unsigned short int xsubi[3], struct drand48_data *buffer, double *result)

stdlib.h (GNU): SVID Random Number Function.

double erf (double x)

math.h (SVID): Special Functions.

double erfc (double x)

math.h (SVID): Special Functions.

float erfcf (float x)

math.h (SVID): Special Functions.

_FloatN erfcfN (_FloatN x)

math.h (TS 18661-3:2015): Special Functions.

_FloatNx erfcfNx (_FloatNx x)

math.h (TS 18661-3:2015): Special Functions.

long double erfcl (long double x)

math.h (SVID): Special Functions.

float erff (float x)

math.h (SVID): Special Functions.

_FloatN erffN (_FloatN x)

math.h (TS 18661-3:2015): Special Functions.

_FloatNx erffNx (_FloatNx x)

math.h (TS 18661-3:2015): Special Functions.

long double erfl (long double x)

math.h (SVID): Special Functions.

void err (int status, const char *format, …)

err.h (BSD): Error Messages.

volatile int errno

errno.h (ISO): Checking for Errors.

void error (int status, int errnum, const char *format, …)

error.h (GNU): Error Messages.

void error_at_line (int status, int errnum, const char *fname, unsigned int lineno, const char *format, …)

error.h (GNU): Error Messages.

unsigned int error_message_count

error.h (GNU): Error Messages.

int error_one_per_line

error.h (GNU): Error Messages.

void (*error_print_progname) (void)

error.h (GNU): Error Messages.

void errx (int status, const char *format, …)

err.h (BSD): Error Messages.

int execl (const char *filename, const char *arg0, …)

unistd.h (POSIX.1): Executing a File.

int execle (const char *filename, const char *arg0, …, char *const env[])

unistd.h (POSIX.1): Executing a File.

int execlp (const char *filename, const char *arg0, …)

unistd.h (POSIX.1): Executing a File.

int execv (const char *filename, char *const argv[])

unistd.h (POSIX.1): Executing a File.

int execve (const char *filename, char *const argv[], char *const env[])

unistd.h (POSIX.1): Executing a File.

int execvp (const char *filename, char *const argv[])

unistd.h (POSIX.1): Executing a File.

void exit (int status)

stdlib.h (ISO): Normal Termination.

struct exit_status

utmp.h (SVID): Manipulating the User Accounting Database.

double exp (double x)

math.h (ISO): Exponentiation and Logarithms.

double exp10 (double x)

math.h (ISO): Exponentiation and Logarithms.

float exp10f (float x)

math.h (ISO): Exponentiation and Logarithms.

_FloatN exp10fN (_FloatN x)

math.h (TS 18661-4:2015): Exponentiation and Logarithms.

_FloatNx exp10fNx (_FloatNx x)

math.h (TS 18661-4:2015): Exponentiation and Logarithms.

long double exp10l (long double x)

math.h (ISO): Exponentiation and Logarithms.

double exp2 (double x)

math.h (ISO): Exponentiation and Logarithms.

float exp2f (float x)

math.h (ISO): Exponentiation and Logarithms.

_FloatN exp2fN (_FloatN x)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

_FloatNx exp2fNx (_FloatNx x)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

long double exp2l (long double x)

math.h (ISO): Exponentiation and Logarithms.

float expf (float x)

math.h (ISO): Exponentiation and Logarithms.

_FloatN expfN (_FloatN x)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

_FloatNx expfNx (_FloatNx x)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

long double expl (long double x)

math.h (ISO): Exponentiation and Logarithms.

void explicit_bzero (void *block, size_t len)

string.h (BSD): Erasing Sensitive Data.

double expm1 (double x)

math.h (ISO): Exponentiation and Logarithms.

float expm1f (float x)

math.h (ISO): Exponentiation and Logarithms.

_FloatN expm1fN (_FloatN x)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

_FloatNx expm1fNx (_FloatNx x)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

long double expm1l (long double x)

math.h (ISO): Exponentiation and Logarithms.

_FloatM fMaddfN (_FloatN x, _FloatN y)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatM fMaddfNx (_FloatNx x, _FloatNx y)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatM fMdivfN (_FloatN x, _FloatN y)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatM fMdivfNx (_FloatNx x, _FloatNx y)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatM fMfmafN (_FloatN x, _FloatN y, _FloatN z)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatM fMfmafNx (_FloatNx x, _FloatNx y, _FloatNx z)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatM fMmulfN (_FloatN x, _FloatN y)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatM fMmulfNx (_FloatNx x, _FloatNx y)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatM fMsqrtfN (_FloatN x)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatM fMsqrtfNx (_FloatNx x)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatM fMsubfN (_FloatN x, _FloatN y)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatM fMsubfNx (_FloatNx x, _FloatNx y)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatMx fMxaddfN (_FloatN x, _FloatN y)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatMx fMxaddfNx (_FloatNx x, _FloatNx y)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatMx fMxdivfN (_FloatN x, _FloatN y)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatMx fMxdivfNx (_FloatNx x, _FloatNx y)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatMx fMxfmafN (_FloatN x, _FloatN y, _FloatN z)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatMx fMxfmafNx (_FloatNx x, _FloatNx y, _FloatNx z)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatMx fMxmulfN (_FloatN x, _FloatN y)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatMx fMxmulfNx (_FloatNx x, _FloatNx y)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatMx fMxsqrtfN (_FloatN x)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatMx fMxsqrtfNx (_FloatNx x)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatMx fMxsubfN (_FloatN x, _FloatN y)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatMx fMxsubfNx (_FloatNx x, _FloatNx y)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

double fabs (double number)

math.h (ISO): Absolute Value.

float fabsf (float number)

math.h (ISO): Absolute Value.

_FloatN fabsfN (_FloatN number)

math.h (TS 18661-3:2015): Absolute Value.

_FloatNx fabsfNx (_FloatNx number)

math.h (TS 18661-3:2015): Absolute Value.

long double fabsl (long double number)

math.h (ISO): Absolute Value.

float fadd (double x, double y)

math.h (TS 18661-1:2014): Miscellaneous FP arithmetic functions.

float faddl (long double x, long double y)

math.h (TS 18661-1:2014): Miscellaneous FP arithmetic functions.

int fchdir (int filedes)

unistd.h (XPG): Working Directory.

int fchmod (int filedes, mode_t mode)

sys/stat.h (BSD): Assigning File Permissions.

int fchown (int filedes, uid_t owner, gid_t group)

unistd.h (BSD): File Owner.

int fclose (FILE *stream)

stdio.h (ISO): Closing Streams.

int fcloseall (void)

stdio.h (GNU): Closing Streams.

int fcntl (int filedes, int command, …)

fcntl.h (POSIX.1): Control Operations on Files.

char * fcvt (double value, int ndigit, int *decpt, int *neg)

stdlib.h (SVID): Old-fashioned System V number-to-string functions.

stdlib.h (Unix98): Old-fashioned System V number-to-string functions.

int fcvt_r (double value, int ndigit, int *decpt, int *neg, char *buf, size_t len)

stdlib.h (SVID): Old-fashioned System V number-to-string functions.

stdlib.h (Unix98): Old-fashioned System V number-to-string functions.

fd_set

sys/types.h (BSD): Waiting for Input or Output.

int fdatasync (int fildes)

unistd.h (POSIX): Synchronizing I/O operations.

double fdim (double x, double y)

math.h (ISO): Miscellaneous FP arithmetic functions.

float fdimf (float x, float y)

math.h (ISO): Miscellaneous FP arithmetic functions.

_FloatN fdimfN (_FloatN x, _FloatN y)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatNx fdimfNx (_FloatNx x, _FloatNx y)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

long double fdiml (long double x, long double y)

math.h (ISO): Miscellaneous FP arithmetic functions.

float fdiv (double x, double y)

math.h (TS 18661-1:2014): Miscellaneous FP arithmetic functions.

float fdivl (long double x, long double y)

math.h (TS 18661-1:2014): Miscellaneous FP arithmetic functions.

FILE * fdopen (int filedes, const char *opentype)

stdio.h (POSIX.1): Descriptors and Streams.

DIR * fdopendir (int fd)

dirent.h (GNU): Opening a Directory Stream.

int feclearexcept (int excepts)

fenv.h (ISO): Examining the FPU status word.

int fedisableexcept (int excepts)

fenv.h (GNU): Floating-Point Control Functions.

int feenableexcept (int excepts)

fenv.h (GNU): Floating-Point Control Functions.

int fegetenv (fenv_t *envp)

fenv.h (ISO): Floating-Point Control Functions.

int fegetexcept (void)

fenv.h (GNU): Floating-Point Control Functions.

int fegetexceptflag (fexcept_t *flagp, int excepts)

fenv.h (ISO): Examining the FPU status word.

int fegetmode (femode_t *modep)

fenv.h (ISO): Floating-Point Control Functions.

int fegetround (void)

fenv.h (ISO): Rounding Modes.

int feholdexcept (fenv_t *envp)

fenv.h (ISO): Floating-Point Control Functions.

int feof (FILE *stream)

stdio.h (ISO): End-Of-File and Errors.

int feof_unlocked (FILE *stream)

stdio.h (GNU): End-Of-File and Errors.

int feraiseexcept (int excepts)

fenv.h (ISO): Examining the FPU status word.

int ferror (FILE *stream)

stdio.h (ISO): End-Of-File and Errors.

int ferror_unlocked (FILE *stream)

stdio.h (GNU): End-Of-File and Errors.

int fesetenv (const fenv_t *envp)

fenv.h (ISO): Floating-Point Control Functions.

int fesetexcept (int excepts)

fenv.h (ISO): Examining the FPU status word.

int fesetexceptflag (const fexcept_t *flagp, int excepts)

fenv.h (ISO): Examining the FPU status word.

int fesetmode (const femode_t *modep)

fenv.h (ISO): Floating-Point Control Functions.

int fesetround (int round)

fenv.h (ISO): Rounding Modes.

int fetestexcept (int excepts)

fenv.h (ISO): Examining the FPU status word.

int fetestexceptflag (const fexcept_t *flagp, int excepts)

fenv.h (ISO): Examining the FPU status word.

int feupdateenv (const fenv_t *envp)

fenv.h (ISO): Floating-Point Control Functions.

int fexecve (int fd, char *const argv[], char *const env[])

unistd.h (POSIX.1): Executing a File.

int fflush (FILE *stream)

stdio.h (ISO): Flushing Buffers.

int fflush_unlocked (FILE *stream)

stdio.h (POSIX): Flushing Buffers.

float ffma (double x, double y, double z)

math.h (TS 18661-1:2014): Miscellaneous FP arithmetic functions.

float ffmal (long double x, long double y, long double z)

math.h (TS 18661-1:2014): Miscellaneous FP arithmetic functions.

int fgetc (FILE *stream)

stdio.h (ISO): Character Input.

int fgetc_unlocked (FILE *stream)

stdio.h (POSIX): Character Input.

struct group * fgetgrent (FILE *stream)

grp.h (SVID): Scanning the List of All Groups.

int fgetgrent_r (FILE *stream, struct group *result_buf, char *buffer, size_t buflen, struct group **result)

grp.h (GNU): Scanning the List of All Groups.

int fgetpos (FILE *stream, fpos_t *position)

stdio.h (ISO): Portable File-Position Functions.

int fgetpos64 (FILE *stream, fpos64_t *position)

stdio.h (Unix98): Portable File-Position Functions.

struct passwd * fgetpwent (FILE *stream)

pwd.h (SVID): Scanning the List of All Users.

int fgetpwent_r (FILE *stream, struct passwd *result_buf, char *buffer, size_t buflen, struct passwd **result)

pwd.h (GNU): Scanning the List of All Users.

char * fgets (char *s, int count, FILE *stream)

stdio.h (ISO): Line-Oriented Input.

char * fgets_unlocked (char *s, int count, FILE *stream)

stdio.h (GNU): Line-Oriented Input.

wint_t fgetwc (FILE *stream)

wchar.h (ISO): Character Input.

wint_t fgetwc_unlocked (FILE *stream)

wchar.h (GNU): Character Input.

wchar_t * fgetws (wchar_t *ws, int count, FILE *stream)

wchar.h (ISO): Line-Oriented Input.

wchar_t * fgetws_unlocked (wchar_t *ws, int count, FILE *stream)

wchar.h (GNU): Line-Oriented Input.

int fileno (FILE *stream)

stdio.h (POSIX.1): Descriptors and Streams.

int fileno_unlocked (FILE *stream)

stdio.h (GNU): Descriptors and Streams.

int finite (double x)

math.h (BSD): Floating-Point Number Classification Functions.

int finitef (float x)

math.h (BSD): Floating-Point Number Classification Functions.

int finitel (long double x)

math.h (BSD): Floating-Point Number Classification Functions.

struct flock

fcntl.h (POSIX.1): File Locks.

void flockfile (FILE *stream)

stdio.h (POSIX): Streams and Threads.

double floor (double x)

math.h (ISO): Rounding Functions.

float floorf (float x)

math.h (ISO): Rounding Functions.

_FloatN floorfN (_FloatN x)

math.h (TS 18661-3:2015): Rounding Functions.

_FloatNx floorfNx (_FloatNx x)

math.h (TS 18661-3:2015): Rounding Functions.

long double floorl (long double x)

math.h (ISO): Rounding Functions.

double fma (double x, double y, double z)

math.h (ISO): Miscellaneous FP arithmetic functions.

float fmaf (float x, float y, float z)

math.h (ISO): Miscellaneous FP arithmetic functions.

_FloatN fmafN (_FloatN x, _FloatN y, _FloatN z)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatNx fmafNx (_FloatNx x, _FloatNx y, _FloatNx z)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

long double fmal (long double x, long double y, long double z)

math.h (ISO): Miscellaneous FP arithmetic functions.

double fmax (double x, double y)

math.h (ISO): Miscellaneous FP arithmetic functions.

float fmaxf (float x, float y)

math.h (ISO): Miscellaneous FP arithmetic functions.

_FloatN fmaxfN (_FloatN x, _FloatN y)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatNx fmaxfNx (_FloatNx x, _FloatNx y)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

double fmaximum (double x, double y)

math.h (C2X): Miscellaneous FP arithmetic functions.

double fmaximum_mag (double x, double y)

math.h (C2X): Miscellaneous FP arithmetic functions.

double fmaximum_mag_num (double x, double y)

math.h (C2X): Miscellaneous FP arithmetic functions.

float fmaximum_mag_numf (float x, float y)

math.h (C2X): Miscellaneous FP arithmetic functions.

_FloatN fmaximum_mag_numfN (_FloatN x, _FloatN y)

math.h (C2X): Miscellaneous FP arithmetic functions.

_FloatNx fmaximum_mag_numfNx (_FloatNx x, _FloatNx y)

math.h (C2X): Miscellaneous FP arithmetic functions.

long double fmaximum_mag_numl (long double x, long double y)

math.h (C2X): Miscellaneous FP arithmetic functions.

float fmaximum_magf (float x, float y)

math.h (C2X): Miscellaneous FP arithmetic functions.

_FloatN fmaximum_magfN (_FloatN x, _FloatN y)

math.h (C2X): Miscellaneous FP arithmetic functions.

_FloatNx fmaximum_magfNx (_FloatNx x, _FloatNx y)

math.h (C2X): Miscellaneous FP arithmetic functions.

long double fmaximum_magl (long double x, long double y)

math.h (C2X): Miscellaneous FP arithmetic functions.

double fmaximum_num (double x, double y)

math.h (C2X): Miscellaneous FP arithmetic functions.

float fmaximum_numf (float x, float y)

math.h (C2X): Miscellaneous FP arithmetic functions.

_FloatN fmaximum_numfN (_FloatN x, _FloatN y)

math.h (C2X): Miscellaneous FP arithmetic functions.

_FloatNx fmaximum_numfNx (_FloatNx x, _FloatNx y)

math.h (C2X): Miscellaneous FP arithmetic functions.

long double fmaximum_numl (long double x, long double y)

math.h (C2X): Miscellaneous FP arithmetic functions.

float fmaximumf (float x, float y)

math.h (C2X): Miscellaneous FP arithmetic functions.

_FloatN fmaximumfN (_FloatN x, _FloatN y)

math.h (C2X): Miscellaneous FP arithmetic functions.

_FloatNx fmaximumfNx (_FloatNx x, _FloatNx y)

math.h (C2X): Miscellaneous FP arithmetic functions.

long double fmaximuml (long double x, long double y)

math.h (C2X): Miscellaneous FP arithmetic functions.

long double fmaxl (long double x, long double y)

math.h (ISO): Miscellaneous FP arithmetic functions.

double fmaxmag (double x, double y)

math.h (ISO): Miscellaneous FP arithmetic functions.

float fmaxmagf (float x, float y)

math.h (ISO): Miscellaneous FP arithmetic functions.

_FloatN fmaxmagfN (_FloatN x, _FloatN y)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatNx fmaxmagfNx (_FloatNx x, _FloatNx y)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

long double fmaxmagl (long double x, long double y)

math.h (ISO): Miscellaneous FP arithmetic functions.

FILE * fmemopen (void *buf, size_t size, const char *opentype)

stdio.h (GNU): String Streams.

double fmin (double x, double y)

math.h (ISO): Miscellaneous FP arithmetic functions.

float fminf (float x, float y)

math.h (ISO): Miscellaneous FP arithmetic functions.

_FloatN fminfN (_FloatN x, _FloatN y)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatNx fminfNx (_FloatNx x, _FloatNx y)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

double fminimum (double x, double y)

math.h (C2X): Miscellaneous FP arithmetic functions.

double fminimum_mag (double x, double y)

math.h (C2X): Miscellaneous FP arithmetic functions.

double fminimum_mag_num (double x, double y)

math.h (C2X): Miscellaneous FP arithmetic functions.

float fminimum_mag_numf (float x, float y)

math.h (C2X): Miscellaneous FP arithmetic functions.

_FloatN fminimum_mag_numfN (_FloatN x, _FloatN y)

math.h (C2X): Miscellaneous FP arithmetic functions.

_FloatNx fminimum_mag_numfNx (_FloatNx x, _FloatNx y)

math.h (C2X): Miscellaneous FP arithmetic functions.

long double fminimum_mag_numl (long double x, long double y)

math.h (C2X): Miscellaneous FP arithmetic functions.

float fminimum_magf (float x, float y)

math.h (C2X): Miscellaneous FP arithmetic functions.

_FloatN fminimum_magfN (_FloatN x, _FloatN y)

math.h (C2X): Miscellaneous FP arithmetic functions.

_FloatNx fminimum_magfNx (_FloatNx x, _FloatNx y)

math.h (C2X): Miscellaneous FP arithmetic functions.

long double fminimum_magl (long double x, long double y)

math.h (C2X): Miscellaneous FP arithmetic functions.

double fminimum_num (double x, double y)

math.h (C2X): Miscellaneous FP arithmetic functions.

float fminimum_numf (float x, float y)

math.h (C2X): Miscellaneous FP arithmetic functions.

_FloatN fminimum_numfN (_FloatN x, _FloatN y)

math.h (C2X): Miscellaneous FP arithmetic functions.

_FloatNx fminimum_numfNx (_FloatNx x, _FloatNx y)

math.h (C2X): Miscellaneous FP arithmetic functions.

long double fminimum_numl (long double x, long double y)

math.h (C2X): Miscellaneous FP arithmetic functions.

float fminimumf (float x, float y)

math.h (C2X): Miscellaneous FP arithmetic functions.

_FloatN fminimumfN (_FloatN x, _FloatN y)

math.h (C2X): Miscellaneous FP arithmetic functions.

_FloatNx fminimumfNx (_FloatNx x, _FloatNx y)

math.h (C2X): Miscellaneous FP arithmetic functions.

long double fminimuml (long double x, long double y)

math.h (C2X): Miscellaneous FP arithmetic functions.

long double fminl (long double x, long double y)

math.h (ISO): Miscellaneous FP arithmetic functions.

double fminmag (double x, double y)

math.h (ISO): Miscellaneous FP arithmetic functions.

float fminmagf (float x, float y)

math.h (ISO): Miscellaneous FP arithmetic functions.

_FloatN fminmagfN (_FloatN x, _FloatN y)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

_FloatNx fminmagfNx (_FloatNx x, _FloatNx y)

math.h (TS 18661-3:2015): Miscellaneous FP arithmetic functions.

long double fminmagl (long double x, long double y)

math.h (ISO): Miscellaneous FP arithmetic functions.

double fmod (double numerator, double denominator)

math.h (ISO): Remainder Functions.

float fmodf (float numerator, float denominator)

math.h (ISO): Remainder Functions.

_FloatN fmodfN (_FloatN numerator, _FloatN denominator)

math.h (TS 18661-3:2015): Remainder Functions.

_FloatNx fmodfNx (_FloatNx numerator, _FloatNx denominator)

math.h (TS 18661-3:2015): Remainder Functions.

long double fmodl (long double numerator, long double denominator)

math.h (ISO): Remainder Functions.

int fmtmsg (long int classification, const char *label, int severity, const char *text, const char *action, const char *tag)

fmtmsg.h (XPG): Printing Formatted Messages.

float fmul (double x, double y)

math.h (TS 18661-1:2014): Miscellaneous FP arithmetic functions.

float fmull (long double x, long double y)

math.h (TS 18661-1:2014): Miscellaneous FP arithmetic functions.

int fnmatch (const char *pattern, const char *string, int flags)

fnmatch.h (POSIX.2): Wildcard Matching.

FILE * fopen (const char *filename, const char *opentype)

stdio.h (ISO): Opening Streams.

FILE * fopen64 (const char *filename, const char *opentype)

stdio.h (Unix98): Opening Streams.

FILE * fopencookie (void *cookie, const char *opentype, cookie_io_functions_t io-functions)

stdio.h (GNU): Custom Streams and Cookies.

pid_t fork (void)

unistd.h (POSIX.1): Creating a Process.

int forkpty (int *amaster, char *name, const struct termios *termp, const struct winsize *winp)

pty.h (BSD): Opening a Pseudo-Terminal Pair.

long int fpathconf (int filedes, int parameter)

unistd.h (POSIX.1): Using pathconf.

int fpclassify (float-type x)

math.h (ISO): Floating-Point Number Classification Functions.

fpos64_t

stdio.h (Unix98): Portable File-Position Functions.

fpos_t

stdio.h (ISO): Portable File-Position Functions.

int fprintf (FILE *stream, const char *template, …)

stdio.h (ISO): Formatted Output Functions.

int fputc (int c, FILE *stream)

stdio.h (ISO): Simple Output by Characters or Lines.

int fputc_unlocked (int c, FILE *stream)

stdio.h (POSIX): Simple Output by Characters or Lines.

int fputs (const char *s, FILE *stream)

stdio.h (ISO): Simple Output by Characters or Lines.

int fputs_unlocked (const char *s, FILE *stream)

stdio.h (GNU): Simple Output by Characters or Lines.

wint_t fputwc (wchar_t wc, FILE *stream)

wchar.h (ISO): Simple Output by Characters or Lines.

wint_t fputwc_unlocked (wchar_t wc, FILE *stream)

wchar.h (POSIX): Simple Output by Characters or Lines.

int fputws (const wchar_t *ws, FILE *stream)

wchar.h (ISO): Simple Output by Characters or Lines.

int fputws_unlocked (const wchar_t *ws, FILE *stream)

wchar.h (GNU): Simple Output by Characters or Lines.

size_t fread (void *data, size_t size, size_t count, FILE *stream)

stdio.h (ISO): Block Input/Output.

size_t fread_unlocked (void *data, size_t size, size_t count, FILE *stream)

stdio.h (GNU): Block Input/Output.

void free (void *ptr)

malloc.h (ISO): Freeing Memory Allocated with malloc.

stdlib.h (ISO): Freeing Memory Allocated with malloc.

FILE * freopen (const char *filename, const char *opentype, FILE *stream)

stdio.h (ISO): Opening Streams.

FILE * freopen64 (const char *filename, const char *opentype, FILE *stream)

stdio.h (Unix98): Opening Streams.

double frexp (double value, int *exponent)

math.h (ISO): Normalization Functions.

float frexpf (float value, int *exponent)

math.h (ISO): Normalization Functions.

_FloatN frexpfN (_FloatN value, int *exponent)

math.h (TS 18661-3:2015): Normalization Functions.

_FloatNx frexpfNx (_FloatNx value, int *exponent)

math.h (TS 18661-3:2015): Normalization Functions.

long double frexpl (long double value, int *exponent)

math.h (ISO): Normalization Functions.

intmax_t fromfp (double x, int round, unsigned int width)

math.h (ISO): Rounding Functions.

intmax_t fromfpf (float x, int round, unsigned int width)

math.h (ISO): Rounding Functions.

intmax_t fromfpfN (_FloatN x, int round, unsigned int width)

math.h (TS 18661-3:2015): Rounding Functions.

intmax_t fromfpfNx (_FloatNx x, int round, unsigned int width)

math.h (TS 18661-3:2015): Rounding Functions.

intmax_t fromfpl (long double x, int round, unsigned int width)

math.h (ISO): Rounding Functions.

intmax_t fromfpx (double x, int round, unsigned int width)

math.h (ISO): Rounding Functions.

intmax_t fromfpxf (float x, int round, unsigned int width)

math.h (ISO): Rounding Functions.

intmax_t fromfpxfN (_FloatN x, int round, unsigned int width)

math.h (TS 18661-3:2015): Rounding Functions.

intmax_t fromfpxfNx (_FloatNx x, int round, unsigned int width)

math.h (TS 18661-3:2015): Rounding Functions.

intmax_t fromfpxl (long double x, int round, unsigned int width)

math.h (ISO): Rounding Functions.

int fscanf (FILE *stream, const char *template, …)

stdio.h (ISO): Formatted Input Functions.

int fseek (FILE *stream, long int offset, int whence)

stdio.h (ISO): File Positioning.

int fseeko (FILE *stream, off_t offset, int whence)

stdio.h (Unix98): File Positioning.

int fseeko64 (FILE *stream, off64_t offset, int whence)

stdio.h (Unix98): File Positioning.

int fsetpos (FILE *stream, const fpos_t *position)

stdio.h (ISO): Portable File-Position Functions.

int fsetpos64 (FILE *stream, const fpos64_t *position)

stdio.h (Unix98): Portable File-Position Functions.

float fsqrt (double x)

math.h (TS 18661-1:2014): Miscellaneous FP arithmetic functions.

float fsqrtl (long double x)

math.h (TS 18661-1:2014): Miscellaneous FP arithmetic functions.

struct fstab

fstab.h (BSD): The fstab file.

int fstat (int filedes, struct stat *buf)

sys/stat.h (POSIX.1): Reading the Attributes of a File.

int fstat64 (int filedes, struct stat64 *buf)

sys/stat.h (Unix98): Reading the Attributes of a File.

float fsub (double x, double y)

math.h (TS 18661-1:2014): Miscellaneous FP arithmetic functions.

float fsubl (long double x, long double y)

math.h (TS 18661-1:2014): Miscellaneous FP arithmetic functions.

int fsync (int fildes)

unistd.h (POSIX): Synchronizing I/O operations.

long int ftell (FILE *stream)

stdio.h (ISO): File Positioning.

off_t ftello (FILE *stream)

stdio.h (Unix98): File Positioning.

off64_t ftello64 (FILE *stream)

stdio.h (Unix98): File Positioning.

int ftruncate (int fd, off_t length)

unistd.h (POSIX): File Size.

int ftruncate64 (int id, off64_t length)

unistd.h (Unix98): File Size.

int ftrylockfile (FILE *stream)

stdio.h (POSIX): Streams and Threads.

int ftw (const char *filename, __ftw_func_t func, int descriptors)

ftw.h (SVID): Working with Directory Trees.

int ftw64 (const char *filename, __ftw64_func_t func, int descriptors)

ftw.h (Unix98): Working with Directory Trees.

void funlockfile (FILE *stream)

stdio.h (POSIX): Streams and Threads.

int futimes (int fd, const struct timeval tvp[2])

sys/time.h (BSD): File Times.

int fwide (FILE *stream, int mode)

wchar.h (ISO): Streams in Internationalized Applications.

int fwprintf (FILE *stream, const wchar_t *template, …)

wchar.h (ISO): Formatted Output Functions.

size_t fwrite (const void *data, size_t size, size_t count, FILE *stream)

stdio.h (ISO): Block Input/Output.

size_t fwrite_unlocked (const void *data, size_t size, size_t count, FILE *stream)

stdio.h (GNU): Block Input/Output.

int fwscanf (FILE *stream, const wchar_t *template, …)

wchar.h (ISO): Formatted Input Functions.

double gamma (double x)

math.h (SVID): Special Functions.

float gammaf (float x)

math.h (SVID): Special Functions.

long double gammal (long double x)

math.h (SVID): Special Functions.

char * gcvt (double value, int ndigit, char *buf)

stdlib.h (SVID): Old-fashioned System V number-to-string functions.

stdlib.h (Unix98): Old-fashioned System V number-to-string functions.

long int get_avphys_pages (void)

sys/sysinfo.h (GNU): How to get information about the memory subsystem?.

char * get_current_dir_name (void)

unistd.h (GNU): Working Directory.

int get_nprocs (void)

sys/sysinfo.h (GNU): Learn about the processors available.

int get_nprocs_conf (void)

sys/sysinfo.h (GNU): Learn about the processors available.

long int get_phys_pages (void)

sys/sysinfo.h (GNU): How to get information about the memory subsystem?.

unsigned long int getauxval (unsigned long int type)

sys/auxv.h (???): Auxiliary Vector.

int getc (FILE *stream)

stdio.h (ISO): Character Input.

int getc_unlocked (FILE *stream)

stdio.h (POSIX): Character Input.

int getchar (void)

stdio.h (ISO): Character Input.

int getchar_unlocked (void)

stdio.h (POSIX): Character Input.

int getcontext (ucontext_t *ucp)

ucontext.h (SVID): Complete Context Control.

int getcpu (unsigned int *cpu, unsigned int *node)

<sched.h> (Linux): Limiting execution to certain CPUs.

char * getcwd (char *buffer, size_t size)

unistd.h (POSIX.1): Working Directory.

struct tm * getdate (const char *string)

time.h (Unix98): A More User-friendly Way to Parse Times and Dates.

getdate_err

time.h (Unix98): A More User-friendly Way to Parse Times and Dates.

int getdate_r (const char *string, struct tm *tp)

time.h (GNU): A More User-friendly Way to Parse Times and Dates.

ssize_t getdelim (char **lineptr, size_t *n, int delimiter, FILE *stream)

stdio.h (GNU): Line-Oriented Input.

ssize_t getdents64 (int fd, void *buffer, size_t length)

dirent.h (Linux): Low-level Directory Access.

int getdomainnname (char *name, size_t length)

unistd.h (???): Host Identification.

gid_t getegid (void)

unistd.h (POSIX.1): Reading the Persona of a Process.

int getentropy (void *buffer, size_t length)

sys/random.h (GNU): Generating Unpredictable Bytes.

char * getenv (const char *name)

stdlib.h (ISO): Environment Access.

uid_t geteuid (void)

unistd.h (POSIX.1): Reading the Persona of a Process.

struct fstab * getfsent (void)

fstab.h (BSD): The fstab file.

struct fstab * getfsfile (const char *name)

fstab.h (BSD): The fstab file.

struct fstab * getfsspec (const char *name)

fstab.h (BSD): The fstab file.

gid_t getgid (void)

unistd.h (POSIX.1): Reading the Persona of a Process.

struct group * getgrent (void)

grp.h (SVID): Scanning the List of All Groups.

grp.h (BSD): Scanning the List of All Groups.

int getgrent_r (struct group *result_buf, char *buffer, size_t buflen, struct group **result)

grp.h (GNU): Scanning the List of All Groups.

struct group * getgrgid (gid_t gid)

grp.h (POSIX.1): Looking Up One Group.

int getgrgid_r (gid_t gid, struct group *result_buf, char *buffer, size_t buflen, struct group **result)

grp.h (POSIX.1c): Looking Up One Group.

struct group * getgrnam (const char *name)

grp.h (SVID): Looking Up One Group.

grp.h (BSD): Looking Up One Group.

int getgrnam_r (const char *name, struct group *result_buf, char *buffer, size_t buflen, struct group **result)

grp.h (POSIX.1c): Looking Up One Group.

int getgrouplist (const char *user, gid_t group, gid_t *groups, int *ngroups)

grp.h (BSD): Setting the Group IDs.

int getgroups (int count, gid_t *groups)

unistd.h (POSIX.1): Reading the Persona of a Process.

struct hostent * gethostbyaddr (const void *addr, socklen_t length, int format)

netdb.h (BSD): Host Names.

int gethostbyaddr_r (const void *addr, socklen_t length, int format, struct hostent *restrict result_buf, char *restrict buf, size_t buflen, struct hostent **restrict result, int *restrict h_errnop)

netdb.h (GNU): Host Names.

struct hostent * gethostbyname (const char *name)

netdb.h (BSD): Host Names.

struct hostent * gethostbyname2 (const char *name, int af)

netdb.h (IPv6 Basic API): Host Names.

int gethostbyname2_r (const char *name, int af, struct hostent *restrict result_buf, char *restrict buf, size_t buflen, struct hostent **restrict result, int *restrict h_errnop)

netdb.h (GNU): Host Names.

int gethostbyname_r (const char *restrict name, struct hostent *restrict result_buf, char *restrict buf, size_t buflen, struct hostent **restrict result, int *restrict h_errnop)

netdb.h (GNU): Host Names.

struct hostent * gethostent (void)

netdb.h (BSD): Host Names.

long int gethostid (void)

unistd.h (BSD): Host Identification.

int gethostname (char *name, size_t size)

unistd.h (BSD): Host Identification.

int getitimer (int which, struct itimerval *old)

sys/time.h (BSD): Setting an Alarm.

ssize_t getline (char **lineptr, size_t *n, FILE *stream)

stdio.h (GNU): Line-Oriented Input.

int getloadavg (double loadavg[], int nelem)

stdlib.h (BSD): Learn about the processors available.

char * getlogin (void)

unistd.h (POSIX.1): Identifying Who Logged In.

struct mntent * getmntent (FILE *stream)

mntent.h (BSD): The mtab file.

struct mntent * getmntent_r (FILE *stream, struct mntent *result, char *buffer, int bufsize)

mntent.h (BSD): The mtab file.

struct netent * getnetbyaddr (uint32_t net, int type)

netdb.h (BSD): Networks Database.

struct netent * getnetbyname (const char *name)

netdb.h (BSD): Networks Database.

struct netent * getnetent (void)

netdb.h (BSD): Networks Database.

int getnetgrent (char **hostp, char **userp, char **domainp)

netdb.h (BSD): Looking up one Netgroup.

int getnetgrent_r (char **hostp, char **userp, char **domainp, char *buffer, size_t buflen)

netdb.h (GNU): Looking up one Netgroup.

int getopt (int argc, char *const *argv, const char *options)

unistd.h (POSIX.2): Using the getopt function.

int getopt_long (int argc, char *const *argv, const char *shortopts, const struct option *longopts, int *indexptr)

getopt.h (GNU): Parsing Long Options with getopt_long.

int getopt_long_only (int argc, char *const *argv, const char *shortopts, const struct option *longopts, int *indexptr)

getopt.h (GNU): Parsing Long Options with getopt_long.

int getpagesize (void)

unistd.h (BSD): How to get information about the memory subsystem?.

char * getpass (const char *prompt)

unistd.h (BSD): Reading Passphrases.

double getpayload (const double *x)

math.h (ISO): Setting and modifying single bits of FP values.

float getpayloadf (const float *x)

math.h (ISO): Setting and modifying single bits of FP values.

_FloatN getpayloadfN (const _FloatN *x)

math.h (TS 18661-3:2015): Setting and modifying single bits of FP values.

_FloatNx getpayloadfNx (const _FloatNx *x)

math.h (TS 18661-3:2015): Setting and modifying single bits of FP values.

long double getpayloadl (const long double *x)

math.h (ISO): Setting and modifying single bits of FP values.

int getpeername (int socket, struct sockaddr *addr, socklen_t *length-ptr)

sys/socket.h (BSD): Who is Connected to Me?.

int getpgid (pid_t pid)

unistd.h (POSIX.1): Process Group Functions.

pid_t getpgrp (void)

unistd.h (POSIX.1): Process Group Functions.

pid_t getpid (void)

unistd.h (POSIX.1): Process Identification.

pid_t getppid (void)

unistd.h (POSIX.1): Process Identification.

int getpriority (int class, int id)

sys/resource.h (BSD): Functions For Traditional Scheduling.

sys/resource.h (POSIX): Functions For Traditional Scheduling.

struct protoent * getprotobyname (const char *name)

netdb.h (BSD): Protocols Database.

struct protoent * getprotobynumber (int protocol)

netdb.h (BSD): Protocols Database.

struct protoent * getprotoent (void)

netdb.h (BSD): Protocols Database.

int getpt (void)

stdlib.h (GNU): Allocating Pseudo-Terminals.

struct passwd * getpwent (void)

pwd.h (POSIX.1): Scanning the List of All Users.

int getpwent_r (struct passwd *result_buf, char *buffer, size_t buflen, struct passwd **result)

pwd.h (GNU): Scanning the List of All Users.

struct passwd * getpwnam (const char *name)

pwd.h (POSIX.1): Looking Up One User.

int getpwnam_r (const char *name, struct passwd *result_buf, char *buffer, size_t buflen, struct passwd **result)

pwd.h (POSIX.1c): Looking Up One User.

struct passwd * getpwuid (uid_t uid)

pwd.h (POSIX.1): Looking Up One User.

int getpwuid_r (uid_t uid, struct passwd *result_buf, char *buffer, size_t buflen, struct passwd **result)

pwd.h (POSIX.1c): Looking Up One User.

ssize_t getrandom (void *buffer, size_t length, unsigned int flags)

sys/random.h (GNU): Generating Unpredictable Bytes.

int getrlimit (int resource, struct rlimit *rlp)

sys/resource.h (BSD): Limiting Resource Usage.

int getrlimit64 (int resource, struct rlimit64 *rlp)

sys/resource.h (Unix98): Limiting Resource Usage.

int getrusage (int processes, struct rusage *rusage)

sys/resource.h (BSD): Resource Usage.

char * gets (char *s)

stdio.h (ISO): Line-Oriented Input.

struct servent * getservbyname (const char *name, const char *proto)

netdb.h (BSD): The Services Database.

struct servent * getservbyport (int port, const char *proto)

netdb.h (BSD): The Services Database.

struct servent * getservent (void)

netdb.h (BSD): The Services Database.

pid_t getsid (pid_t pid)

unistd.h (SVID): Process Group Functions.

int getsockname (int socket, struct sockaddr *addr, socklen_t *length-ptr)

sys/socket.h (BSD): Reading the Address of a Socket.

int getsockopt (int socket, int level, int optname, void *optval, socklen_t *optlen-ptr)

sys/socket.h (BSD): Socket Option Functions.

int getsubopt (char **optionp, char *const *tokens, char **valuep)

stdlib.h (???): Parsing of Suboptions.

char * gettext (const char *msgid)

libintl.h (GNU): What has to be done to translate a message?.

pid_t gettid (void)

unistd.h (Linux): Process Identification.

int gettimeofday (struct timeval *tp, void *tzp)

sys/time.h (BSD): Getting the Time.

uid_t getuid (void)

unistd.h (POSIX.1): Reading the Persona of a Process.

mode_t getumask (void)

sys/stat.h (GNU): Assigning File Permissions.

struct utmp * getutent (void)

utmp.h (SVID): Manipulating the User Accounting Database.

int getutent_r (struct utmp *buffer, struct utmp **result)

utmp.h (GNU): Manipulating the User Accounting Database.

struct utmp * getutid (const struct utmp *id)

utmp.h (SVID): Manipulating the User Accounting Database.

int getutid_r (const struct utmp *id, struct utmp *buffer, struct utmp **result)

utmp.h (GNU): Manipulating the User Accounting Database.

struct utmp * getutline (const struct utmp *line)

utmp.h (SVID): Manipulating the User Accounting Database.

int getutline_r (const struct utmp *line, struct utmp *buffer, struct utmp **result)

utmp.h (GNU): Manipulating the User Accounting Database.

int getutmp (const struct utmpx *utmpx, struct utmp *utmp)

utmp.h (GNU): XPG User Accounting Database Functions.

utmpx.h (GNU): XPG User Accounting Database Functions.

int getutmpx (const struct utmp *utmp, struct utmpx *utmpx)

utmp.h (GNU): XPG User Accounting Database Functions.

utmpx.h (GNU): XPG User Accounting Database Functions.

struct utmpx * getutxent (void)

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

struct utmpx * getutxid (const struct utmpx *id)

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

struct utmpx * getutxline (const struct utmpx *line)

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

int getw (FILE *stream)

stdio.h (SVID): Character Input.

wint_t getwc (FILE *stream)

wchar.h (ISO): Character Input.

wint_t getwc_unlocked (FILE *stream)

wchar.h (GNU): Character Input.

wint_t getwchar (void)

wchar.h (ISO): Character Input.

wint_t getwchar_unlocked (void)

wchar.h (GNU): Character Input.

char * getwd (char *buffer)

unistd.h (BSD): Working Directory.

gid_t

sys/types.h (POSIX.1): Reading the Persona of a Process.

int glob (const char *pattern, int flags, int (*errfunc) (const char *filename, int error-code), glob_t *vector-ptr)

glob.h (POSIX.2): Calling glob.

int glob64 (const char *pattern, int flags, int (*errfunc) (const char *filename, int error-code), glob64_t *vector-ptr)

glob.h (GNU): Calling glob.

glob64_t

glob.h (GNU): Calling glob.

glob_t

glob.h (POSIX.2): Calling glob.

void globfree (glob_t *pglob)

glob.h (POSIX.2): More Flags for Globbing.

void globfree64 (glob64_t *pglob)

glob.h (GNU): More Flags for Globbing.

struct tm * gmtime (const time_t *time)

time.h (ISO): Broken-down Time.

struct tm * gmtime_r (const time_t *time, struct tm *resultp)

time.h (POSIX.1c): Broken-down Time.

int grantpt (int filedes)

stdlib.h (SVID): Allocating Pseudo-Terminals.

stdlib.h (XPG4.2): Allocating Pseudo-Terminals.

struct group

grp.h (POSIX.1): The Data Structure for a Group.

int gsignal (int signum)

signal.h (SVID): Signaling Yourself.

int gtty (int filedes, struct sgttyb *attributes)

sgtty.h (BSD): BSD Terminal Modes.

char * hasmntopt (const struct mntent *mnt, const char *opt)

mntent.h (BSD): The mtab file.

int hcreate (size_t nel)

search.h (SVID): The hsearch function..

int hcreate_r (size_t nel, struct hsearch_data *htab)

search.h (GNU): The hsearch function..

void hdestroy (void)

search.h (SVID): The hsearch function..

void hdestroy_r (struct hsearch_data *htab)

search.h (GNU): The hsearch function..

struct hostent

netdb.h (BSD): Host Names.

ENTRY * hsearch (ENTRY item, ACTION action)

search.h (SVID): The hsearch function..

int hsearch_r (ENTRY item, ACTION action, ENTRY **retval, struct hsearch_data *htab)

search.h (GNU): The hsearch function..

uint32_t htonl (uint32_t hostlong)

netinet/in.h (BSD): Byte Order Conversion.

uint16_t htons (uint16_t hostshort)

netinet/in.h (BSD): Byte Order Conversion.

double hypot (double x, double y)

math.h (ISO): Exponentiation and Logarithms.

float hypotf (float x, float y)

math.h (ISO): Exponentiation and Logarithms.

_FloatN hypotfN (_FloatN x, _FloatN y)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

_FloatNx hypotfNx (_FloatNx x, _FloatNx y)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

long double hypotl (long double x, long double y)

math.h (ISO): Exponentiation and Logarithms.

size_t iconv (iconv_t cd, char **inbuf, size_t *inbytesleft, char **outbuf, size_t *outbytesleft)

iconv.h (XPG2): Generic Character Set Conversion Interface.

int iconv_close (iconv_t cd)

iconv.h (XPG2): Generic Character Set Conversion Interface.

iconv_t iconv_open (const char *tocode, const char *fromcode)

iconv.h (XPG2): Generic Character Set Conversion Interface.

iconv_t

iconv.h (XPG2): Generic Character Set Conversion Interface.

void if_freenameindex (struct if_nameindex *ptr)

net/if.h (IPv6 basic API): Interface Naming.

char * if_indextoname (unsigned int ifindex, char *ifname)

net/if.h (IPv6 basic API): Interface Naming.

struct if_nameindex

net/if.h (IPv6 basic API): Interface Naming.

struct if_nameindex * if_nameindex (void)

net/if.h (IPv6 basic API): Interface Naming.

unsigned int if_nametoindex (const char *ifname)

net/if.h (IPv6 basic API): Interface Naming.

int ilogb (double x)

math.h (ISO): Exponentiation and Logarithms.

int ilogbf (float x)

math.h (ISO): Exponentiation and Logarithms.

int ilogbfN (_FloatN x)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

int ilogbfNx (_FloatNx x)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

int ilogbl (long double x)

math.h (ISO): Exponentiation and Logarithms.

intmax_t imaxabs (intmax_t number)

inttypes.h (ISO): Absolute Value.

imaxdiv_t imaxdiv (intmax_t numerator, intmax_t denominator)

inttypes.h (ISO): Integer Division.

imaxdiv_t

inttypes.h (ISO): Integer Division.

struct in6_addr

netinet/in.h (IPv6 basic API): Host Address Data Type.

struct in6_addr in6addr_any

netinet/in.h (IPv6 basic API): Host Address Data Type.

struct in6_addr in6addr_loopback

netinet/in.h (IPv6 basic API): Host Address Data Type.

struct in_addr

netinet/in.h (BSD): Host Address Data Type.

char * index (const char *string, int c)

string.h (BSD): Search Functions.

uint32_t inet_addr (const char *name)

arpa/inet.h (BSD): Host Address Functions.

int inet_aton (const char *name, struct in_addr *addr)

arpa/inet.h (BSD): Host Address Functions.

uint32_t inet_lnaof (struct in_addr addr)

arpa/inet.h (BSD): Host Address Functions.

struct in_addr inet_makeaddr (uint32_t net, uint32_t local)

arpa/inet.h (BSD): Host Address Functions.

uint32_t inet_netof (struct in_addr addr)

arpa/inet.h (BSD): Host Address Functions.

uint32_t inet_network (const char *name)

arpa/inet.h (BSD): Host Address Functions.

char * inet_ntoa (struct in_addr addr)

arpa/inet.h (BSD): Host Address Functions.

const char * inet_ntop (int af, const void *cp, char *buf, socklen_t len)

arpa/inet.h (IPv6 basic API): Host Address Functions.

int inet_pton (int af, const char *cp, void *buf)

arpa/inet.h (IPv6 basic API): Host Address Functions.

int initgroups (const char *user, gid_t group)

grp.h (BSD): Setting the Group IDs.

char * initstate (unsigned int seed, char *state, size_t size)

stdlib.h (BSD): BSD Random Number Functions.

int initstate_r (unsigned int seed, char *restrict statebuf, size_t statelen, struct random_data *restrict buf)

stdlib.h (GNU): BSD Random Number Functions.

int innetgr (const char *netgroup, const char *host, const char *user, const char *domain)

netdb.h (BSD): Testing for Netgroup Membership.

ino64_t

sys/types.h (Unix98): The meaning of the File Attributes.

ino_t

sys/types.h (POSIX.1): The meaning of the File Attributes.

int ioctl (int filedes, int command, …)

sys/ioctl.h (BSD): Generic I/O Control operations.

struct iovec

sys/uio.h (BSD): Fast Scatter-Gather I/O.

int isalnum (int c)

ctype.h (ISO): Classification of Characters.

int isalpha (int c)

ctype.h (ISO): Classification of Characters.

int isascii (int c)

ctype.h (SVID): Classification of Characters.

ctype.h (BSD): Classification of Characters.

int isatty (int filedes)

unistd.h (POSIX.1): Identifying Terminals.

int isblank (int c)

ctype.h (ISO): Classification of Characters.

int iscanonical (float-type x)

math.h (ISO): Floating-Point Number Classification Functions.

int iscntrl (int c)

ctype.h (ISO): Classification of Characters.

int isdigit (int c)

ctype.h (ISO): Classification of Characters.

int iseqsig (real-floating x, real-floating y)

math.h (ISO): Floating-Point Comparison Functions.

int isfinite (float-type x)

math.h (ISO): Floating-Point Number Classification Functions.

int isgraph (int c)

ctype.h (ISO): Classification of Characters.

int isgreater (real-floating x, real-floating y)

math.h (ISO): Floating-Point Comparison Functions.

int isgreaterequal (real-floating x, real-floating y)

math.h (ISO): Floating-Point Comparison Functions.

int isinf (double x)

math.h (BSD): Floating-Point Number Classification Functions.

int isinff (float x)

math.h (BSD): Floating-Point Number Classification Functions.

int isinfl (long double x)

math.h (BSD): Floating-Point Number Classification Functions.

int isless (real-floating x, real-floating y)

math.h (ISO): Floating-Point Comparison Functions.

int islessequal (real-floating x, real-floating y)

math.h (ISO): Floating-Point Comparison Functions.

int islessgreater (real-floating x, real-floating y)

math.h (ISO): Floating-Point Comparison Functions.

int islower (int c)

ctype.h (ISO): Classification of Characters.

int isnan (float-type x)

math.h (ISO): Floating-Point Number Classification Functions.

int isnan (double x)

math.h (BSD): Floating-Point Number Classification Functions.

int isnanf (float x)

math.h (BSD): Floating-Point Number Classification Functions.

int isnanl (long double x)

math.h (BSD): Floating-Point Number Classification Functions.

int isnormal (float-type x)

math.h (ISO): Floating-Point Number Classification Functions.

int isprint (int c)

ctype.h (ISO): Classification of Characters.

int ispunct (int c)

ctype.h (ISO): Classification of Characters.

int issignaling (float-type x)

math.h (ISO): Floating-Point Number Classification Functions.

int isspace (int c)

ctype.h (ISO): Classification of Characters.

int issubnormal (float-type x)

math.h (ISO): Floating-Point Number Classification Functions.

int isunordered (real-floating x, real-floating y)

math.h (ISO): Floating-Point Comparison Functions.

int isupper (int c)

ctype.h (ISO): Classification of Characters.

int iswalnum (wint_t wc)

wctype.h (ISO): Character class determination for wide characters.

int iswalpha (wint_t wc)

wctype.h (ISO): Character class determination for wide characters.

int iswblank (wint_t wc)

wctype.h (ISO): Character class determination for wide characters.

int iswcntrl (wint_t wc)

wctype.h (ISO): Character class determination for wide characters.

int iswctype (wint_t wc, wctype_t desc)

wctype.h (ISO): Character class determination for wide characters.

int iswdigit (wint_t wc)

wctype.h (ISO): Character class determination for wide characters.

int iswgraph (wint_t wc)

wctype.h (ISO): Character class determination for wide characters.

int iswlower (wint_t wc)

ctype.h (ISO): Character class determination for wide characters.

int iswprint (wint_t wc)

wctype.h (ISO): Character class determination for wide characters.

int iswpunct (wint_t wc)

wctype.h (ISO): Character class determination for wide characters.

int iswspace (wint_t wc)

wctype.h (ISO): Character class determination for wide characters.

int iswupper (wint_t wc)

wctype.h (ISO): Character class determination for wide characters.

int iswxdigit (wint_t wc)

wctype.h (ISO): Character class determination for wide characters.

int isxdigit (int c)

ctype.h (ISO): Classification of Characters.

int iszero (float-type x)

math.h (ISO): Floating-Point Number Classification Functions.

struct itimerval

sys/time.h (BSD): Setting an Alarm.

double j0 (double x)

math.h (SVID): Special Functions.

float j0f (float x)

math.h (SVID): Special Functions.

_FloatN j0fN (_FloatN x)

math.h (GNU): Special Functions.

_FloatNx j0fNx (_FloatNx x)

math.h (GNU): Special Functions.

long double j0l (long double x)

math.h (SVID): Special Functions.

double j1 (double x)

math.h (SVID): Special Functions.

float j1f (float x)

math.h (SVID): Special Functions.

_FloatN j1fN (_FloatN x)

math.h (GNU): Special Functions.

_FloatNx j1fNx (_FloatNx x)

math.h (GNU): Special Functions.

long double j1l (long double x)

math.h (SVID): Special Functions.

jmp_buf

setjmp.h (ISO): Details of Non-Local Exits.

double jn (int n, double x)

math.h (SVID): Special Functions.

float jnf (int n, float x)

math.h (SVID): Special Functions.

_FloatN jnfN (int n, _FloatN x)

math.h (GNU): Special Functions.

_FloatNx jnfNx (int n, _FloatNx x)

math.h (GNU): Special Functions.

long double jnl (int n, long double x)

math.h (SVID): Special Functions.

long int jrand48 (unsigned short int xsubi[3])

stdlib.h (SVID): SVID Random Number Function.

int jrand48_r (unsigned short int xsubi[3], struct drand48_data *buffer, long int *result)

stdlib.h (GNU): SVID Random Number Function.

int kill (pid_t pid, int signum)

signal.h (POSIX.1): Signaling Another Process.

int killpg (int pgid, int signum)

signal.h (BSD): Signaling Another Process.

char * l64a (long int n)

stdlib.h (XPG): Encode Binary Data.

long int labs (long int number)

stdlib.h (ISO): Absolute Value.

void lcong48 (unsigned short int param[7])

stdlib.h (SVID): SVID Random Number Function.

int lcong48_r (unsigned short int param[7], struct drand48_data *buffer)

stdlib.h (GNU): SVID Random Number Function.

struct lconv

locale.h (ISO): localeconv: It is portable but ….

double ldexp (double value, int exponent)

math.h (ISO): Normalization Functions.

float ldexpf (float value, int exponent)

math.h (ISO): Normalization Functions.

_FloatN ldexpfN (_FloatN value, int exponent)

math.h (TS 18661-3:2015): Normalization Functions.

_FloatNx ldexpfNx (_FloatNx value, int exponent)

math.h (TS 18661-3:2015): Normalization Functions.

long double ldexpl (long double value, int exponent)

math.h (ISO): Normalization Functions.

ldiv_t ldiv (long int numerator, long int denominator)

stdlib.h (ISO): Integer Division.

ldiv_t

stdlib.h (ISO): Integer Division.

void * lfind (const void *key, const void *base, size_t *nmemb, size_t size, comparison_fn_t compar)

search.h (SVID): Array Search Function.

double lgamma (double x)

math.h (SVID): Special Functions.

double lgamma_r (double x, int *signp)

math.h (XPG): Special Functions.

float lgammaf (float x)

math.h (SVID): Special Functions.

_FloatN lgammafN (_FloatN x)

math.h (TS 18661-3:2015): Special Functions.

_FloatN lgammafN_r (_FloatN x, int *signp)

math.h (GNU): Special Functions.

_FloatNx lgammafNx (_FloatNx x)

math.h (TS 18661-3:2015): Special Functions.

_FloatNx lgammafNx_r (_FloatNx x, int *signp)

math.h (GNU): Special Functions.

float lgammaf_r (float x, int *signp)

math.h (XPG): Special Functions.

long double lgammal (long double x)

math.h (SVID): Special Functions.

long double lgammal_r (long double x, int *signp)

math.h (XPG): Special Functions.

struct linger

sys/socket.h (BSD): Socket-Level Options.

int link (const char *oldname, const char *newname)

unistd.h (POSIX.1): Hard Links.

int linkat (int oldfd, const char *oldname, int newfd, const char *newname, int flags)

unistd.h (POSIX.1): Hard Links.

int lio_listio (int mode, struct aiocb *const list[], int nent, struct sigevent *sig)

aio.h (POSIX.1b): Asynchronous Read and Write Operations.

int lio_listio64 (int mode, struct aiocb64 *const list[], int nent, struct sigevent *sig)

aio.h (Unix98): Asynchronous Read and Write Operations.

int listen (int socket, int n)

sys/socket.h (BSD): Listening for Connections.

long long int llabs (long long int number)

stdlib.h (ISO): Absolute Value.

lldiv_t lldiv (long long int numerator, long long int denominator)

stdlib.h (ISO): Integer Division.

lldiv_t

stdlib.h (ISO): Integer Division.

long int llogb (double x)

math.h (ISO): Exponentiation and Logarithms.

long int llogbf (float x)

math.h (ISO): Exponentiation and Logarithms.

long int llogbfN (_FloatN x)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

long int llogbfNx (_FloatNx x)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

long int llogbl (long double x)

math.h (ISO): Exponentiation and Logarithms.

long long int llrint (double x)

math.h (ISO): Rounding Functions.

long long int llrintf (float x)

math.h (ISO): Rounding Functions.

long long int llrintfN (_FloatN x)

math.h (TS 18661-3:2015): Rounding Functions.

long long int llrintfNx (_FloatNx x)

math.h (TS 18661-3:2015): Rounding Functions.

long long int llrintl (long double x)

math.h (ISO): Rounding Functions.

long long int llround (double x)

math.h (ISO): Rounding Functions.

long long int llroundf (float x)

math.h (ISO): Rounding Functions.

long long int llroundfN (_FloatN x)

math.h (TS 18661-3:2015): Rounding Functions.

long long int llroundfNx (_FloatNx x)

math.h (TS 18661-3:2015): Rounding Functions.

long long int llroundl (long double x)

math.h (ISO): Rounding Functions.

struct lconv * localeconv (void)

locale.h (ISO): localeconv: It is portable but ….

struct tm * localtime (const time_t *time)

time.h (ISO): Broken-down Time.

struct tm * localtime_r (const time_t *time, struct tm *resultp)

time.h (POSIX.1c): Broken-down Time.

double log (double x)

math.h (ISO): Exponentiation and Logarithms.

double log10 (double x)

math.h (ISO): Exponentiation and Logarithms.

float log10f (float x)

math.h (ISO): Exponentiation and Logarithms.

_FloatN log10fN (_FloatN x)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

_FloatNx log10fNx (_FloatNx x)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

long double log10l (long double x)

math.h (ISO): Exponentiation and Logarithms.

double log1p (double x)

math.h (ISO): Exponentiation and Logarithms.

float log1pf (float x)

math.h (ISO): Exponentiation and Logarithms.

_FloatN log1pfN (_FloatN x)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

_FloatNx log1pfNx (_FloatNx x)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

long double log1pl (long double x)

math.h (ISO): Exponentiation and Logarithms.

double log2 (double x)

math.h (ISO): Exponentiation and Logarithms.

float log2f (float x)

math.h (ISO): Exponentiation and Logarithms.

_FloatN log2fN (_FloatN x)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

_FloatNx log2fNx (_FloatNx x)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

long double log2l (long double x)

math.h (ISO): Exponentiation and Logarithms.

double logb (double x)

math.h (ISO): Exponentiation and Logarithms.

float logbf (float x)

math.h (ISO): Exponentiation and Logarithms.

_FloatN logbfN (_FloatN x)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

_FloatNx logbfNx (_FloatNx x)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

long double logbl (long double x)

math.h (ISO): Exponentiation and Logarithms.

float logf (float x)

math.h (ISO): Exponentiation and Logarithms.

_FloatN logfN (_FloatN x)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

_FloatNx logfNx (_FloatNx x)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

void login (const struct utmp *entry)

utmp.h (BSD): Logging In and Out.

int login_tty (int filedes)

utmp.h (BSD): Logging In and Out.

long double logl (long double x)

math.h (ISO): Exponentiation and Logarithms.

int logout (const char *ut_line)

utmp.h (BSD): Logging In and Out.

void logwtmp (const char *ut_line, const char *ut_name, const char *ut_host)

utmp.h (BSD): Logging In and Out.

void longjmp (jmp_buf state, int value)

setjmp.h (ISO): Details of Non-Local Exits.

long int lrand48 (void)

stdlib.h (SVID): SVID Random Number Function.

int lrand48_r (struct drand48_data *buffer, long int *result)

stdlib.h (GNU): SVID Random Number Function.

long int lrint (double x)

math.h (ISO): Rounding Functions.

long int lrintf (float x)

math.h (ISO): Rounding Functions.

long int lrintfN (_FloatN x)

math.h (TS 18661-3:2015): Rounding Functions.

long int lrintfNx (_FloatNx x)

math.h (TS 18661-3:2015): Rounding Functions.

long int lrintl (long double x)

math.h (ISO): Rounding Functions.

long int lround (double x)

math.h (ISO): Rounding Functions.

long int lroundf (float x)

math.h (ISO): Rounding Functions.

long int lroundfN (_FloatN x)

math.h (TS 18661-3:2015): Rounding Functions.

long int lroundfNx (_FloatNx x)

math.h (TS 18661-3:2015): Rounding Functions.

long int lroundl (long double x)

math.h (ISO): Rounding Functions.

void * lsearch (const void *key, void *base, size_t *nmemb, size_t size, comparison_fn_t compar)

search.h (SVID): Array Search Function.

off_t lseek (int filedes, off_t offset, int whence)

unistd.h (POSIX.1): Setting the File Position of a Descriptor.

off64_t lseek64 (int filedes, off64_t offset, int whence)

unistd.h (Unix98): Setting the File Position of a Descriptor.

int lstat (const char *filename, struct stat *buf)

sys/stat.h (BSD): Reading the Attributes of a File.

int lstat64 (const char *filename, struct stat64 *buf)

sys/stat.h (Unix98): Reading the Attributes of a File.

int lutimes (const char *filename, const struct timeval tvp[2])

sys/time.h (BSD): File Times.

int madvise (void *addr, size_t length, int advice)

sys/mman.h (POSIX): Memory-mapped I/O.

void makecontext (ucontext_t *ucp, void (*func) (void), int argc, …)

ucontext.h (SVID): Complete Context Control.

struct mallinfo2

malloc.h (GNU): Statistics for Memory Allocation with malloc.

struct mallinfo2 mallinfo2 (void)

malloc.h (SVID): Statistics for Memory Allocation with malloc.

void * malloc (size_t size)

malloc.h (ISO): Basic Memory Allocation.

stdlib.h (ISO): Basic Memory Allocation.

int mblen (const char *string, size_t size)

stdlib.h (ISO): Non-reentrant Conversion of Single Characters.

size_t mbrlen (const char *restrict s, size_t n, mbstate_t *ps)

wchar.h (ISO): Converting Single Characters.

size_t mbrtowc (wchar_t *restrict pwc, const char *restrict s, size_t n, mbstate_t *restrict ps)

wchar.h (ISO): Converting Single Characters.

int mbsinit (const mbstate_t *ps)

wchar.h (ISO): Representing the state of the conversion.

size_t mbsnrtowcs (wchar_t *restrict dst, const char **restrict src, size_t nmc, size_t len, mbstate_t *restrict ps)

wchar.h (GNU): Converting Multibyte and Wide Character Strings.

size_t mbsrtowcs (wchar_t *restrict dst, const char **restrict src, size_t len, mbstate_t *restrict ps)

wchar.h (ISO): Converting Multibyte and Wide Character Strings.

mbstate_t

wchar.h (ISO): Representing the state of the conversion.

size_t mbstowcs (wchar_t *wstring, const char *string, size_t size)

stdlib.h (ISO): Non-reentrant Conversion of Strings.

int mbtowc (wchar_t *restrict result, const char *restrict string, size_t size)

stdlib.h (ISO): Non-reentrant Conversion of Single Characters.

int mcheck (void (*abortfn) (enum mcheck_status status))

mcheck.h (GNU): Heap Consistency Checking.

void * memalign (size_t boundary, size_t size)

malloc.h (BSD): Allocating Aligned Memory Blocks.

void * memccpy (void *restrict to, const void *restrict from, int c, size_t size)

string.h (SVID): Copying Strings and Arrays.

void * memchr (const void *block, int c, size_t size)

string.h (ISO): Search Functions.

int memcmp (const void *a1, const void *a2, size_t size)

string.h (ISO): String/Array Comparison.

void * memcpy (void *restrict to, const void *restrict from, size_t size)

string.h (ISO): Copying Strings and Arrays.

int memfd_create (const char *name, unsigned int flags)

sys/mman.h (Linux): Memory-mapped I/O.

void * memfrob (void *mem, size_t length)

string.h (GNU): Obfuscating Data.

void * memmem (const void *haystack, size_t haystack-len,
const void *needle, size_t needle-len)

string.h (GNU): Search Functions.

void * memmove (void *to, const void *from, size_t size)

string.h (ISO): Copying Strings and Arrays.

void * mempcpy (void *restrict to, const void *restrict from, size_t size)

string.h (GNU): Copying Strings and Arrays.

void * memrchr (const void *block, int c, size_t size)

string.h (GNU): Search Functions.

void * memset (void *block, int c, size_t size)

string.h (ISO): Copying Strings and Arrays.

int mkdir (const char *filename, mode_t mode)

sys/stat.h (POSIX.1): Creating Directories.

char * mkdtemp (char *template)

stdlib.h (BSD): Temporary Files.

int mkfifo (const char *filename, mode_t mode)

sys/stat.h (POSIX.1): FIFO Special Files.

int mknod (const char *filename, mode_t mode, dev_t dev)

sys/stat.h (BSD): Making Special Files.

int mkstemp (char *template)

stdlib.h (BSD): Temporary Files.

char * mktemp (char *template)

stdlib.h (Unix): Temporary Files.

time_t mktime (struct tm *brokentime)

time.h (ISO): Broken-down Time.

int mlock (const void *addr, size_t len)

sys/mman.h (POSIX.1b): Functions To Lock And Unlock Pages.

int mlock2 (const void *addr, size_t len, unsigned int flags)

sys/mman.h (Linux): Functions To Lock And Unlock Pages.

int mlockall (int flags)

sys/mman.h (POSIX.1b): Functions To Lock And Unlock Pages.

void * mmap (void *address, size_t length, int protect, int flags, int filedes, off_t offset)

sys/mman.h (POSIX): Memory-mapped I/O.

void * mmap64 (void *address, size_t length, int protect, int flags, int filedes, off64_t offset)

sys/mman.h (LFS): Memory-mapped I/O.

struct mntent

mntent.h (BSD): The mtab file.

mode_t

sys/types.h (POSIX.1): The meaning of the File Attributes.

double modf (double value, double *integer-part)

math.h (ISO): Rounding Functions.

float modff (float value, float *integer-part)

math.h (ISO): Rounding Functions.

_FloatN modffN (_FloatN value, _FloatN *integer-part)

math.h (TS 18661-3:2015): Rounding Functions.

_FloatNx modffNx (_FloatNx value, _FloatNx *integer-part)

math.h (TS 18661-3:2015): Rounding Functions.

long double modfl (long double value, long double *integer-part)

math.h (ISO): Rounding Functions.

int mount (const char *special_file, const char *dir, const char *fstype, unsigned long int options, const void *data)

sys/mount.h (SVID): Mount, Unmount, Remount.

sys/mount.h (BSD): Mount, Unmount, Remount.

int mprotect (void *address, size_t length, int protection)

sys/mman.h (POSIX): Memory Protection.

long int mrand48 (void)

stdlib.h (SVID): SVID Random Number Function.

int mrand48_r (struct drand48_data *buffer, long int *result)

stdlib.h (GNU): SVID Random Number Function.

void * mremap (void *address, size_t length, size_t new_length, int flag)

sys/mman.h (GNU): Memory-mapped I/O.

int msync (void *address, size_t length, int flags)

sys/mman.h (POSIX): Memory-mapped I/O.

void mtrace (void)

mcheck.h (GNU): How to install the tracing functionality.

void mtx_destroy (mtx_t *mutex)

threads.h (C11): Mutexes.

int mtx_init (mtx_t *mutex, int type)

threads.h (C11): Mutexes.

int mtx_lock (mtx_t *mutex)

threads.h (C11): Mutexes.

mtx_plain

threads.h (C11): Mutexes.

mtx_recursive

threads.h (C11): Mutexes.

mtx_t

threads.h (C11): Mutexes.

mtx_timed

threads.h (C11): Mutexes.

int mtx_timedlock (mtx_t *restrict mutex, const struct timespec *restrict time_point)

threads.h (C11): Mutexes.

int mtx_trylock (mtx_t *mutex)

threads.h (C11): Mutexes.

int mtx_unlock (mtx_t *mutex)

threads.h (C11): Mutexes.

int munlock (const void *addr, size_t len)

sys/mman.h (POSIX.1b): Functions To Lock And Unlock Pages.

int munlockall (void)

sys/mman.h (POSIX.1b): Functions To Lock And Unlock Pages.

int munmap (void *addr, size_t length)

sys/mman.h (POSIX): Memory-mapped I/O.

void muntrace (void)

mcheck.h (GNU): How to install the tracing functionality.

double nan (const char *tagp)

math.h (ISO): Setting and modifying single bits of FP values.

float nanf (const char *tagp)

math.h (ISO): Setting and modifying single bits of FP values.

_FloatN nanfN (const char *tagp)

math.h (TS 18661-3:2015): Setting and modifying single bits of FP values.

_FloatNx nanfNx (const char *tagp)

math.h (TS 18661-3:2015): Setting and modifying single bits of FP values.

long double nanl (const char *tagp)

math.h (ISO): Setting and modifying single bits of FP values.

int nanosleep (const struct timespec *requested_time, struct timespec *remaining)

time.h (POSIX.1): Sleeping.

double nearbyint (double x)

math.h (ISO): Rounding Functions.

float nearbyintf (float x)

math.h (ISO): Rounding Functions.

_FloatN nearbyintfN (_FloatN x)

math.h (TS 18661-3:2015): Rounding Functions.

_FloatNx nearbyintfNx (_FloatNx x)

math.h (TS 18661-3:2015): Rounding Functions.

long double nearbyintl (long double x)

math.h (ISO): Rounding Functions.

struct netent

netdb.h (BSD): Networks Database.

double nextafter (double x, double y)

math.h (ISO): Setting and modifying single bits of FP values.

float nextafterf (float x, float y)

math.h (ISO): Setting and modifying single bits of FP values.

_FloatN nextafterfN (_FloatN x, _FloatN y)

math.h (TS 18661-3:2015): Setting and modifying single bits of FP values.

_FloatNx nextafterfNx (_FloatNx x, _FloatNx y)

math.h (TS 18661-3:2015): Setting and modifying single bits of FP values.

long double nextafterl (long double x, long double y)

math.h (ISO): Setting and modifying single bits of FP values.

double nextdown (double x)

math.h (ISO): Setting and modifying single bits of FP values.

float nextdownf (float x)

math.h (ISO): Setting and modifying single bits of FP values.

_FloatN nextdownfN (_FloatN x)

math.h (TS 18661-3:2015): Setting and modifying single bits of FP values.

_FloatNx nextdownfNx (_FloatNx x)

math.h (TS 18661-3:2015): Setting and modifying single bits of FP values.

long double nextdownl (long double x)

math.h (ISO): Setting and modifying single bits of FP values.

double nexttoward (double x, long double y)

math.h (ISO): Setting and modifying single bits of FP values.

float nexttowardf (float x, long double y)

math.h (ISO): Setting and modifying single bits of FP values.

long double nexttowardl (long double x, long double y)

math.h (ISO): Setting and modifying single bits of FP values.

double nextup (double x)

math.h (ISO): Setting and modifying single bits of FP values.

float nextupf (float x)

math.h (ISO): Setting and modifying single bits of FP values.

_FloatN nextupfN (_FloatN x)

math.h (TS 18661-3:2015): Setting and modifying single bits of FP values.

_FloatNx nextupfNx (_FloatNx x)

math.h (TS 18661-3:2015): Setting and modifying single bits of FP values.

long double nextupl (long double x)

math.h (ISO): Setting and modifying single bits of FP values.

int nftw (const char *filename, __nftw_func_t func, int descriptors, int flag)

ftw.h (XPG4.2): Working with Directory Trees.

int nftw64 (const char *filename, __nftw64_func_t func, int descriptors, int flag)

ftw.h (Unix98): Working with Directory Trees.

char * ngettext (const char *msgid1, const char *msgid2, unsigned long int n)

libintl.h (GNU): Additional functions for more complicated situations.

int nice (int increment)

unistd.h (BSD): Functions For Traditional Scheduling.

char * nl_langinfo (nl_item item)

langinfo.h (XOPEN): Pinpoint Access to Locale Data.

nlink_t

sys/types.h (POSIX.1): The meaning of the File Attributes.

long int nrand48 (unsigned short int xsubi[3])

stdlib.h (SVID): SVID Random Number Function.

int nrand48_r (unsigned short int xsubi[3], struct drand48_data *buffer, long int *result)

stdlib.h (GNU): SVID Random Number Function.

uint32_t ntohl (uint32_t netlong)

netinet/in.h (BSD): Byte Order Conversion.

uint16_t ntohs (uint16_t netshort)

netinet/in.h (BSD): Byte Order Conversion.

int ntp_adjtime (struct timex *tptr)

sys/timex.h (GNU): Setting and Adjusting the Time.

int ntp_gettime (struct ntptimeval *tptr)

sys/timex.h (GNU): Setting and Adjusting the Time.

struct obstack

obstack.h (GNU): Creating Obstacks.

void obstack_1grow (struct obstack *obstack-ptr, char c)

obstack.h (GNU): Growing Objects.

void obstack_1grow_fast (struct obstack *obstack-ptr, char c)

obstack.h (GNU): Extra Fast Growing Objects.

int obstack_alignment_mask (struct obstack *obstack-ptr)

obstack.h (GNU): Alignment of Data in Obstacks.

void * obstack_alloc (struct obstack *obstack-ptr, int size)

obstack.h (GNU): Allocation in an Obstack.

obstack_alloc_failed_handler

obstack.h (GNU): Preparing for Using Obstacks.

void * obstack_base (struct obstack *obstack-ptr)

obstack.h (GNU): Status of an Obstack.

void obstack_blank (struct obstack *obstack-ptr, int size)

obstack.h (GNU): Growing Objects.

void obstack_blank_fast (struct obstack *obstack-ptr, int size)

obstack.h (GNU): Extra Fast Growing Objects.

int obstack_chunk_size (struct obstack *obstack-ptr)

obstack.h (GNU): Obstack Chunks.

void * obstack_copy (struct obstack *obstack-ptr, void *address, int size)

obstack.h (GNU): Allocation in an Obstack.

void * obstack_copy0 (struct obstack *obstack-ptr, void *address, int size)

obstack.h (GNU): Allocation in an Obstack.

void * obstack_finish (struct obstack *obstack-ptr)

obstack.h (GNU): Growing Objects.

void obstack_free (struct obstack *obstack-ptr, void *object)

obstack.h (GNU): Freeing Objects in an Obstack.

void obstack_grow (struct obstack *obstack-ptr, void *data, int size)

obstack.h (GNU): Growing Objects.

void obstack_grow0 (struct obstack *obstack-ptr, void *data, int size)

obstack.h (GNU): Growing Objects.

int obstack_init (struct obstack *obstack-ptr)

obstack.h (GNU): Preparing for Using Obstacks.

void obstack_int_grow (struct obstack *obstack-ptr, int data)

obstack.h (GNU): Growing Objects.

void obstack_int_grow_fast (struct obstack *obstack-ptr, int data)

obstack.h (GNU): Extra Fast Growing Objects.

void * obstack_next_free (struct obstack *obstack-ptr)

obstack.h (GNU): Status of an Obstack.

int obstack_object_size (struct obstack *obstack-ptr)

obstack.h (GNU): Growing Objects.

obstack.h (GNU): Status of an Obstack.

int obstack_printf (struct obstack *obstack, const char *template, …)

stdio.h (GNU): Dynamically Allocating Formatted Output.

void obstack_ptr_grow (struct obstack *obstack-ptr, void *data)

obstack.h (GNU): Growing Objects.

void obstack_ptr_grow_fast (struct obstack *obstack-ptr, void *data)

obstack.h (GNU): Extra Fast Growing Objects.

int obstack_room (struct obstack *obstack-ptr)

obstack.h (GNU): Extra Fast Growing Objects.

int obstack_vprintf (struct obstack *obstack, const char *template, va_list ap)

stdio.h (GNU): Variable Arguments Output Functions.

off64_t

sys/types.h (Unix98): Setting the File Position of a Descriptor.

off_t

sys/types.h (POSIX.1): Setting the File Position of a Descriptor.

size_t offsetof (type, member)

stddef.h (ISO): Structure Field Offset Measurement.

int on_exit (void (*function)(int status, void *arg), void *arg)

stdlib.h (SunOS): Cleanups on Exit.

once_flag

threads.h (C11): Call Once.

int open (const char *filename, int flags[, mode_t mode])

fcntl.h (POSIX.1): Opening and Closing Files.

int open64 (const char *filename, int flags[, mode_t mode])

fcntl.h (Unix98): Opening and Closing Files.

FILE * open_memstream (char **ptr, size_t *sizeloc)

stdio.h (GNU): String Streams.

DIR * opendir (const char *dirname)

dirent.h (POSIX.1): Opening a Directory Stream.

void openlog (const char *ident, int option, int facility)

syslog.h (BSD): openlog.

int openpty (int *amaster, int *aslave, char *name, const struct termios *termp, const struct winsize *winp)

pty.h (BSD): Opening a Pseudo-Terminal Pair.

char * optarg

unistd.h (POSIX.2): Using the getopt function.

int opterr

unistd.h (POSIX.2): Using the getopt function.

int optind

unistd.h (POSIX.2): Using the getopt function.

struct option

getopt.h (GNU): Parsing Long Options with getopt_long.

int optopt

unistd.h (POSIX.2): Using the getopt function.

size_t parse_printf_format (const char *template, size_t n, int *argtypes)

printf.h (GNU): Parsing a Template String.

struct passwd

pwd.h (POSIX.1): The Data Structure that Describes a User.

long int pathconf (const char *filename, int parameter)

unistd.h (POSIX.1): Using pathconf.

int pause (void)

unistd.h (POSIX.1): Using pause.

int pclose (FILE *stream)

stdio.h (POSIX.2): Pipe to a Subprocess.

stdio.h (SVID): Pipe to a Subprocess.

stdio.h (BSD): Pipe to a Subprocess.

void perror (const char *message)

stdio.h (ISO): Error Messages.

pid_t

sys/types.h (POSIX.1): Process Identification.

pid_t pidfd_getpid (int fd)

sys/pidfd.h (GNU): Querying a Process.

int pipe (int filedes[2])

unistd.h (POSIX.1): Creating a Pipe.

int pkey_alloc (unsigned int flags, unsigned int restrictions)

sys/mman.h (Linux): Memory Protection.

int pkey_free (int key)

sys/mman.h (Linux): Memory Protection.

int pkey_get (int key)

sys/mman.h (Linux): Memory Protection.

int pkey_mprotect (void *address, size_t length, int protection, int key)

sys/mman.h (Linux): Memory Protection.

int pkey_set (int key, unsigned int rights)

sys/mman.h (Linux): Memory Protection.

FILE * popen (const char *command, const char *mode)

stdio.h (POSIX.2): Pipe to a Subprocess.

stdio.h (SVID): Pipe to a Subprocess.

stdio.h (BSD): Pipe to a Subprocess.

int posix_memalign (void **memptr, size_t alignment, size_t size)

stdlib.h (POSIX): Allocating Aligned Memory Blocks.

int posix_openpt (int flags)

stdlib.h (POSIX.1): Allocating Pseudo-Terminals.

double pow (double base, double power)

math.h (ISO): Exponentiation and Logarithms.

float powf (float base, float power)

math.h (ISO): Exponentiation and Logarithms.

_FloatN powfN (_FloatN base, _FloatN power)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

_FloatNx powfNx (_FloatNx base, _FloatNx power)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

long double powl (long double base, long double power)

math.h (ISO): Exponentiation and Logarithms.

ssize_t pread (int filedes, void *buffer, size_t size, off_t offset)

unistd.h (Unix98): Input and Output Primitives.

ssize_t pread64 (int filedes, void *buffer, size_t size, off64_t offset)

unistd.h (Unix98): Input and Output Primitives.

ssize_t preadv (int fd, const struct iovec *iov, int iovcnt, off_t offset)

sys/uio.h (BSD): Fast Scatter-Gather I/O.

ssize_t preadv2 (int fd, const struct iovec *iov, int iovcnt, off_t offset, int flags)

sys/uio.h (GNU): Fast Scatter-Gather I/O.

ssize_t preadv64 (int fd, const struct iovec *iov, int iovcnt, off64_t offset)

unistd.h (BSD): Fast Scatter-Gather I/O.

ssize_t preadv64v2 (int fd, const struct iovec *iov, int iovcnt, off64_t offset, int flags)

unistd.h (GNU): Fast Scatter-Gather I/O.

int printf (const char *template, …)

stdio.h (ISO): Formatted Output Functions.

printf_arginfo_function

printf.h (GNU): Defining the Output Handler.

printf_function

printf.h (GNU): Defining the Output Handler.

struct printf_info

printf.h (GNU): Conversion Specifier Options.

int printf_size (FILE *fp, const struct printf_info *info, const void *const *args)

printf.h (GNU): Predefined printf Handlers.

int printf_size_info (const struct printf_info *info, size_t n, int *argtypes)

printf.h (GNU): Predefined printf Handlers.

char * program_invocation_name

errno.h (GNU): Error Messages.

char * program_invocation_short_name

errno.h (GNU): Error Messages.

struct protoent

netdb.h (BSD): Protocols Database.

void psignal (int signum, const char *message)

signal.h (BSD): Signal Messages.

int pthread_attr_getsigmask_np (const pthread_attr_t *attr, sigset_t *sigmask)

pthread.h (GNU): Controlling the Initial Signal Mask of a New Thread.

int pthread_attr_setsigmask_np (pthread_attr_t *attr, const sigset_t *sigmask)

pthread.h (GNU): Controlling the Initial Signal Mask of a New Thread.

int pthread_clockjoin_np (pthread_t *thread, void **thread_return, clockid_t clockid, const struct timespec *abstime)

pthread.h (GNU): Functions for Waiting According to a Specific Clock.

int pthread_getattr_default_np (pthread_attr_t *attr)

pthread.h (GNU): Setting Process-wide defaults for thread attributes.

void *pthread_getspecific (pthread_key_t key)

pthread.h (POSIX): Thread-specific Data.

int pthread_key_create (pthread_key_t *key, void (*destructor)(void*))

pthread.h (POSIX): Thread-specific Data.

int pthread_key_delete (pthread_key_t key)

pthread.h (POSIX): Thread-specific Data.

int pthread_setattr_default_np (pthread_attr_t *attr)

pthread.h (GNU): Setting Process-wide defaults for thread attributes.

int pthread_setspecific (pthread_key_t key, const void *value)

pthread.h (POSIX): Thread-specific Data.

int pthread_timedjoin_np (pthread_t *thread, void **thread_return, const struct timespec *abstime)

pthread.h (GNU): Functions for Waiting According to a Specific Clock.

int pthread_tryjoin_np (pthread_t *thread, void **thread_return)

pthread.h (GNU): Functions for Waiting According to a Specific Clock.

ptrdiff_t

stddef.h (ISO): Important Data Types.

char * ptsname (int filedes)

stdlib.h (SVID): Allocating Pseudo-Terminals.

stdlib.h (XPG4.2): Allocating Pseudo-Terminals.

int ptsname_r (int filedes, char *buf, size_t len)

stdlib.h (GNU): Allocating Pseudo-Terminals.

int putc (int c, FILE *stream)

stdio.h (ISO): Simple Output by Characters or Lines.

int putc_unlocked (int c, FILE *stream)

stdio.h (POSIX): Simple Output by Characters or Lines.

int putchar (int c)

stdio.h (ISO): Simple Output by Characters or Lines.

int putchar_unlocked (int c)

stdio.h (POSIX): Simple Output by Characters or Lines.

int putenv (char *string)

stdlib.h (SVID): Environment Access.

int putpwent (const struct passwd *p, FILE *stream)

pwd.h (SVID): Writing a User Entry.

int puts (const char *s)

stdio.h (ISO): Simple Output by Characters or Lines.

struct utmp * pututline (const struct utmp *utmp)

utmp.h (SVID): Manipulating the User Accounting Database.

struct utmpx * pututxline (const struct utmpx *utmp)

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

int putw (int w, FILE *stream)

stdio.h (SVID): Simple Output by Characters or Lines.

wint_t putwc (wchar_t wc, FILE *stream)

wchar.h (ISO): Simple Output by Characters or Lines.

wint_t putwc_unlocked (wchar_t wc, FILE *stream)

wchar.h (GNU): Simple Output by Characters or Lines.

wint_t putwchar (wchar_t wc)

wchar.h (ISO): Simple Output by Characters or Lines.

wint_t putwchar_unlocked (wchar_t wc)

wchar.h (GNU): Simple Output by Characters or Lines.

ssize_t pwrite (int filedes, const void *buffer, size_t size, off_t offset)

unistd.h (Unix98): Input and Output Primitives.

ssize_t pwrite64 (int filedes, const void *buffer, size_t size, off64_t offset)

unistd.h (Unix98): Input and Output Primitives.

ssize_t pwritev (int fd, const struct iovec *iov, int iovcnt, off_t offset)

sys/uio.h (BSD): Fast Scatter-Gather I/O.

ssize_t pwritev2 (int fd, const struct iovec *iov, int iovcnt, off_t offset, int flags)

sys/uio.h (GNU): Fast Scatter-Gather I/O.

ssize_t pwritev64 (int fd, const struct iovec *iov, int iovcnt, off64_t offset)

unistd.h (BSD): Fast Scatter-Gather I/O.

ssize_t pwritev64v2 (int fd, const struct iovec *iov, int iovcnt, off64_t offset, int flags)

unistd.h (GNU): Fast Scatter-Gather I/O.

char * qecvt (long double value, int ndigit, int *decpt, int *neg)

stdlib.h (GNU): Old-fashioned System V number-to-string functions.

int qecvt_r (long double value, int ndigit, int *decpt, int *neg, char *buf, size_t len)

stdlib.h (GNU): Old-fashioned System V number-to-string functions.

char * qfcvt (long double value, int ndigit, int *decpt, int *neg)

stdlib.h (GNU): Old-fashioned System V number-to-string functions.

int qfcvt_r (long double value, int ndigit, int *decpt, int *neg, char *buf, size_t len)

stdlib.h (GNU): Old-fashioned System V number-to-string functions.

char * qgcvt (long double value, int ndigit, char *buf)

stdlib.h (GNU): Old-fashioned System V number-to-string functions.

void qsort (void *array, size_t count, size_t size, comparison_fn_t compare)

stdlib.h (ISO): Array Sort Function.

int raise (int signum)

signal.h (ISO): Signaling Yourself.

int rand (void)

stdlib.h (ISO): ISO C Random Number Functions.

int rand_r (unsigned int *seed)

stdlib.h (POSIX.1): ISO C Random Number Functions.

long int random (void)

stdlib.h (BSD): BSD Random Number Functions.

struct random_data

stdlib.h (GNU): BSD Random Number Functions.

int random_r (struct random_data *restrict buf, int32_t *restrict result)

stdlib.h (GNU): BSD Random Number Functions.

void * rawmemchr (const void *block, int c)

string.h (GNU): Search Functions.

ssize_t read (int filedes, void *buffer, size_t size)

unistd.h (POSIX.1): Input and Output Primitives.

struct dirent * readdir (DIR *dirstream)

dirent.h (POSIX.1): Reading and Closing a Directory Stream.

struct dirent64 * readdir64 (DIR *dirstream)

dirent.h (LFS): Reading and Closing a Directory Stream.

int readdir64_r (DIR *dirstream, struct dirent64 *entry, struct dirent64 **result)

dirent.h (LFS): Reading and Closing a Directory Stream.

int readdir_r (DIR *dirstream, struct dirent *entry, struct dirent **result)

dirent.h (GNU): Reading and Closing a Directory Stream.

ssize_t readlink (const char *filename, char *buffer, size_t size)

unistd.h (BSD): Symbolic Links.

ssize_t readv (int filedes, const struct iovec *vector, int count)

sys/uio.h (BSD): Fast Scatter-Gather I/O.

void * realloc (void *ptr, size_t newsize)

malloc.h (ISO): Changing the Size of a Block.

stdlib.h (ISO): Changing the Size of a Block.

void * reallocarray (void *ptr, size_t nmemb, size_t size)

malloc.h (BSD): Changing the Size of a Block.

stdlib.h (BSD): Changing the Size of a Block.

char * realpath (const char *restrict name, char *restrict resolved)

stdlib.h (XPG): Symbolic Links.

ssize_t recv (int socket, void *buffer, size_t size, int flags)

sys/socket.h (BSD): Receiving Data.

ssize_t recvfrom (int socket, void *buffer, size_t size, int flags, struct sockaddr *addr, socklen_t *length-ptr)

sys/socket.h (BSD): Receiving Datagrams.

int regcomp (regex_t *restrict compiled, const char *restrict pattern, int cflags)

regex.h (POSIX.2): POSIX Regular Expression Compilation.

size_t regerror (int errcode, const regex_t *restrict compiled, char *restrict buffer, size_t length)

regex.h (POSIX.2): POSIX Regexp Matching Cleanup.

regex_t

regex.h (POSIX.2): POSIX Regular Expression Compilation.

int regexec (const regex_t *restrict compiled, const char *restrict string, size_t nmatch, regmatch_t matchptr[restrict], int eflags)

regex.h (POSIX.2): Matching a Compiled POSIX Regular Expression.

void regfree (regex_t *compiled)

regex.h (POSIX.2): POSIX Regexp Matching Cleanup.

int register_printf_function (int spec, printf_function handler-function, printf_arginfo_function arginfo-function)

printf.h (GNU): Registering New Conversions.

regmatch_t

regex.h (POSIX.2): Match Results with Subexpressions.

regoff_t

regex.h (POSIX.2): Match Results with Subexpressions.

double remainder (double numerator, double denominator)

math.h (ISO): Remainder Functions.

float remainderf (float numerator, float denominator)

math.h (ISO): Remainder Functions.

_FloatN remainderfN (_FloatN numerator, _FloatN denominator)

math.h (TS 18661-3:2015): Remainder Functions.

_FloatNx remainderfNx (_FloatNx numerator, _FloatNx denominator)

math.h (TS 18661-3:2015): Remainder Functions.

long double remainderl (long double numerator, long double denominator)

math.h (ISO): Remainder Functions.

int remove (const char *filename)

stdio.h (ISO): Deleting Files.

int rename (const char *oldname, const char *newname)

stdio.h (ISO): Renaming Files.

void rewind (FILE *stream)

stdio.h (ISO): File Positioning.

void rewinddir (DIR *dirstream)

dirent.h (POSIX.1): Random Access in a Directory Stream.

char * rindex (const char *string, int c)

string.h (BSD): Search Functions.

double rint (double x)

math.h (ISO): Rounding Functions.

float rintf (float x)

math.h (ISO): Rounding Functions.

_FloatN rintfN (_FloatN x)

math.h (TS 18661-3:2015): Rounding Functions.

_FloatNx rintfNx (_FloatNx x)

math.h (TS 18661-3:2015): Rounding Functions.

long double rintl (long double x)

math.h (ISO): Rounding Functions.

struct rlimit

sys/resource.h (BSD): Limiting Resource Usage.

struct rlimit64

sys/resource.h (Unix98): Limiting Resource Usage.

int rmdir (const char *filename)

unistd.h (POSIX.1): Deleting Files.

double round (double x)

math.h (ISO): Rounding Functions.

double roundeven (double x)

math.h (ISO): Rounding Functions.

float roundevenf (float x)

math.h (ISO): Rounding Functions.

_FloatN roundevenfN (_FloatN x)

math.h (TS 18661-3:2015): Rounding Functions.

_FloatNx roundevenfNx (_FloatNx x)

math.h (TS 18661-3:2015): Rounding Functions.

long double roundevenl (long double x)

math.h (ISO): Rounding Functions.

float roundf (float x)

math.h (ISO): Rounding Functions.

_FloatN roundfN (_FloatN x)

math.h (TS 18661-3:2015): Rounding Functions.

_FloatNx roundfNx (_FloatNx x)

math.h (TS 18661-3:2015): Rounding Functions.

long double roundl (long double x)

math.h (ISO): Rounding Functions.

int rpmatch (const char *response)

stdlib.h (GNU): Yes-or-No Questions.

struct rseq

sys/rseq.h (Linux): Restartable Sequences.

struct rusage

sys/resource.h (BSD): Resource Usage.

void *sbrk (ptrdiff_t delta)

unistd.h (BSD): Resizing the Data Segment.

double scalb (double value, double exponent)

math.h (BSD): Normalization Functions.

float scalbf (float value, float exponent)

math.h (BSD): Normalization Functions.

long double scalbl (long double value, long double exponent)

math.h (BSD): Normalization Functions.

double scalbln (double x, long int n)

math.h (BSD): Normalization Functions.

float scalblnf (float x, long int n)

math.h (BSD): Normalization Functions.

_FloatN scalblnfN (_FloatN x, long int n)

math.h (TS 18661-3:2015): Normalization Functions.

_FloatNx scalblnfNx (_FloatNx x, long int n)

math.h (TS 18661-3:2015): Normalization Functions.

long double scalblnl (long double x, long int n)

math.h (BSD): Normalization Functions.

double scalbn (double x, int n)

math.h (BSD): Normalization Functions.

float scalbnf (float x, int n)

math.h (BSD): Normalization Functions.

_FloatN scalbnfN (_FloatN x, int n)

math.h (TS 18661-3:2015): Normalization Functions.

_FloatNx scalbnfNx (_FloatNx x, int n)

math.h (TS 18661-3:2015): Normalization Functions.

long double scalbnl (long double x, int n)

math.h (BSD): Normalization Functions.

int scandir (const char *dir, struct dirent ***namelist, int (*selector) (const struct dirent *), int (*cmp) (const struct dirent **, const struct dirent **))

dirent.h (BSD): Scanning the Content of a Directory.

dirent.h (SVID): Scanning the Content of a Directory.

int scandir64 (const char *dir, struct dirent64 ***namelist, int (*selector) (const struct dirent64 *), int (*cmp) (const struct dirent64 **, const struct dirent64 **))

dirent.h (GNU): Scanning the Content of a Directory.

int scanf (const char *template, …)

stdio.h (ISO): Formatted Input Functions.

int sched_get_priority_max (int policy)

sched.h (POSIX): Basic Scheduling Functions.

int sched_get_priority_min (int policy)

sched.h (POSIX): Basic Scheduling Functions.

int sched_getaffinity (pid_t pid, size_t cpusetsize, cpu_set_t *cpuset)

sched.h (GNU): Limiting execution to certain CPUs.

int sched_getparam (pid_t pid, struct sched_param *param)

sched.h (POSIX): Basic Scheduling Functions.

int sched_getscheduler (pid_t pid)

sched.h (POSIX): Basic Scheduling Functions.

struct sched_param

sched.h (POSIX): Basic Scheduling Functions.

int sched_rr_get_interval (pid_t pid, struct timespec *interval)

sched.h (POSIX): Basic Scheduling Functions.

int sched_setaffinity (pid_t pid, size_t cpusetsize, const cpu_set_t *cpuset)

sched.h (GNU): Limiting execution to certain CPUs.

int sched_setparam (pid_t pid, const struct sched_param *param)

sched.h (POSIX): Basic Scheduling Functions.

int sched_setscheduler (pid_t pid, int policy, const struct sched_param *param)

sched.h (POSIX): Basic Scheduling Functions.

int sched_yield (void)

sched.h (POSIX): Basic Scheduling Functions.

char * secure_getenv (const char *name)

stdlib.h (GNU): Environment Access.

unsigned short int * seed48 (unsigned short int seed16v[3])

stdlib.h (SVID): SVID Random Number Function.

int seed48_r (unsigned short int seed16v[3], struct drand48_data *buffer)

stdlib.h (GNU): SVID Random Number Function.

void seekdir (DIR *dirstream, long int pos)

dirent.h (BSD): Random Access in a Directory Stream.

int select (int nfds, fd_set *read-fds, fd_set *write-fds, fd_set *except-fds, struct timeval *timeout)

sys/types.h (BSD): Waiting for Input or Output.

ssize_t send (int socket, const void *buffer, size_t size, int flags)

sys/socket.h (BSD): Sending Data.

ssize_t sendto (int socket, const void *buffer, size_t size, int flags, struct sockaddr *addr, socklen_t length)

sys/socket.h (BSD): Sending Datagrams.

struct servent

netdb.h (BSD): The Services Database.

void setbuf (FILE *stream, char *buf)

stdio.h (ISO): Controlling Which Kind of Buffering.

void setbuffer (FILE *stream, char *buf, size_t size)

stdio.h (BSD): Controlling Which Kind of Buffering.

int setcontext (const ucontext_t *ucp)

ucontext.h (SVID): Complete Context Control.

int setdomainname (const char *name, size_t length)

unistd.h (???): Host Identification.

int setegid (gid_t newgid)

unistd.h (POSIX.1): Setting the Group IDs.

int setenv (const char *name, const char *value, int replace)

stdlib.h (BSD): Environment Access.

int seteuid (uid_t neweuid)

unistd.h (POSIX.1): Setting the User ID.

int setfsent (void)

fstab.h (BSD): The fstab file.

int setgid (gid_t newgid)

unistd.h (POSIX.1): Setting the Group IDs.

void setgrent (void)

grp.h (SVID): Scanning the List of All Groups.

grp.h (BSD): Scanning the List of All Groups.

int setgroups (size_t count, const gid_t *groups)

grp.h (BSD): Setting the Group IDs.

void sethostent (int stayopen)

netdb.h (BSD): Host Names.

int sethostid (long int id)

unistd.h (BSD): Host Identification.

int sethostname (const char *name, size_t length)

unistd.h (BSD): Host Identification.

int setitimer (int which, const struct itimerval *new, struct itimerval *old)

sys/time.h (BSD): Setting an Alarm.

int setjmp (jmp_buf state)

setjmp.h (ISO): Details of Non-Local Exits.

void setlinebuf (FILE *stream)

stdio.h (BSD): Controlling Which Kind of Buffering.

char * setlocale (int category, const char *locale)

locale.h (ISO): How Programs Set the Locale.

int setlogmask (int mask)

syslog.h (BSD): setlogmask.

FILE * setmntent (const char *file, const char *mode)

mntent.h (BSD): The mtab file.

void setnetent (int stayopen)

netdb.h (BSD): Networks Database.

int setnetgrent (const char *netgroup)

netdb.h (BSD): Looking up one Netgroup.

int setpayload (double *x, double payload)

math.h (ISO): Setting and modifying single bits of FP values.

int setpayloadf (float *x, float payload)

math.h (ISO): Setting and modifying single bits of FP values.

int setpayloadfN (_FloatN *x, _FloatN payload)

math.h (TS 18661-3:2015): Setting and modifying single bits of FP values.

int setpayloadfNx (_FloatNx *x, _FloatNx payload)

math.h (TS 18661-3:2015): Setting and modifying single bits of FP values.

int setpayloadl (long double *x, long double payload)

math.h (ISO): Setting and modifying single bits of FP values.

int setpayloadsig (double *x, double payload)

math.h (ISO): Setting and modifying single bits of FP values.

int setpayloadsigf (float *x, float payload)

math.h (ISO): Setting and modifying single bits of FP values.

int setpayloadsigfN (_FloatN *x, _FloatN payload)

math.h (TS 18661-3:2015): Setting and modifying single bits of FP values.

int setpayloadsigfNx (_FloatNx *x, _FloatNx payload)

math.h (TS 18661-3:2015): Setting and modifying single bits of FP values.

int setpayloadsigl (long double *x, long double payload)

math.h (ISO): Setting and modifying single bits of FP values.

int setpgid (pid_t pid, pid_t pgid)

unistd.h (POSIX.1): Process Group Functions.

int setpgrp (pid_t pid, pid_t pgid)

unistd.h (BSD): Process Group Functions.

int setpriority (int class, int id, int niceval)

sys/resource.h (BSD): Functions For Traditional Scheduling.

sys/resource.h (POSIX): Functions For Traditional Scheduling.

void setprotoent (int stayopen)

netdb.h (BSD): Protocols Database.

void setpwent (void)

pwd.h (SVID): Scanning the List of All Users.

pwd.h (BSD): Scanning the List of All Users.

int setregid (gid_t rgid, gid_t egid)

unistd.h (BSD): Setting the Group IDs.

int setreuid (uid_t ruid, uid_t euid)

unistd.h (BSD): Setting the User ID.

int setrlimit (int resource, const struct rlimit *rlp)

sys/resource.h (BSD): Limiting Resource Usage.

int setrlimit64 (int resource, const struct rlimit64 *rlp)

sys/resource.h (Unix98): Limiting Resource Usage.

void setservent (int stayopen)

netdb.h (BSD): The Services Database.

pid_t setsid (void)

unistd.h (POSIX.1): Process Group Functions.

int setsockopt (int socket, int level, int optname, const void *optval, socklen_t optlen)

sys/socket.h (BSD): Socket Option Functions.

char * setstate (char *state)

stdlib.h (BSD): BSD Random Number Functions.

int setstate_r (char *restrict statebuf, struct random_data *restrict buf)

stdlib.h (GNU): BSD Random Number Functions.

int settimeofday (const struct timeval *tp, const void *tzp)

sys/time.h (BSD): Setting and Adjusting the Time.

int setuid (uid_t newuid)

unistd.h (POSIX.1): Setting the User ID.

void setutent (void)

utmp.h (SVID): Manipulating the User Accounting Database.

void setutxent (void)

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

int setvbuf (FILE *stream, char *buf, int mode, size_t size)

stdio.h (ISO): Controlling Which Kind of Buffering.

struct sgttyb

termios.h (BSD): BSD Terminal Modes.

int shm_open (const char *name, int oflag, mode_t mode)

sys/mman.h (POSIX): Memory-mapped I/O.

int shutdown (int socket, int how)

sys/socket.h (BSD): Closing a Socket.

sig_atomic_t

signal.h (ISO): Atomic Types.

const char * sigabbrev_np (int signum)

string.h (GNU): Signal Messages.

int sigaction (int signum, const struct sigaction *restrict action, struct sigaction *restrict old-action)

signal.h (POSIX.1): Advanced Signal Handling.

struct sigaction

signal.h (POSIX.1): Advanced Signal Handling.

int sigaddset (sigset_t *set, int signum)

signal.h (POSIX.1): Signal Sets.

int sigaltstack (const stack_t *restrict stack, stack_t *restrict oldstack)

signal.h (XPG): Using a Separate Signal Stack.

int sigblock (int mask)

signal.h (BSD): BSD Signal Handling.

int sigdelset (sigset_t *set, int signum)

signal.h (POSIX.1): Signal Sets.

const char * sigdescr_np (int signum)

string.h (GNU): Signal Messages.

int sigemptyset (sigset_t *set)

signal.h (POSIX.1): Signal Sets.

int sigfillset (sigset_t *set)

signal.h (POSIX.1): Signal Sets.

sighandler_t

signal.h (GNU): Basic Signal Handling.

int siginterrupt (int signum, int failflag)

signal.h (XPG): BSD Signal Handling.

int sigismember (const sigset_t *set, int signum)

signal.h (POSIX.1): Signal Sets.

sigjmp_buf

setjmp.h (POSIX.1): Non-Local Exits and Signals.

void siglongjmp (sigjmp_buf state, int value)

setjmp.h (POSIX.1): Non-Local Exits and Signals.

int sigmask (int signum)

signal.h (BSD): BSD Signal Handling.

sighandler_t signal (int signum, sighandler_t action)

signal.h (ISO): Basic Signal Handling.

int signbit (float-type x)

math.h (ISO): Setting and modifying single bits of FP values.

double significand (double x)

math.h (BSD): Normalization Functions.

float significandf (float x)

math.h (BSD): Normalization Functions.

long double significandl (long double x)

math.h (BSD): Normalization Functions.

int sigpause (int mask)

signal.h (BSD): BSD Signal Handling.

int sigpending (sigset_t *set)

signal.h (POSIX.1): Checking for Pending Signals.

int sigprocmask (int how, const sigset_t *restrict set, sigset_t *restrict oldset)

signal.h (POSIX.1): Process Signal Mask.

sigset_t

signal.h (POSIX.1): Signal Sets.

int sigsetjmp (sigjmp_buf state, int savesigs)

setjmp.h (POSIX.1): Non-Local Exits and Signals.

int sigsetmask (int mask)

signal.h (BSD): BSD Signal Handling.

int sigstack (struct sigstack *stack, struct sigstack *oldstack)

signal.h (BSD): Using a Separate Signal Stack.

struct sigstack

signal.h (BSD): Using a Separate Signal Stack.

int sigsuspend (const sigset_t *set)

signal.h (POSIX.1): Using sigsuspend.

double sin (double x)

math.h (ISO): Trigonometric Functions.

void sincos (double x, double *sinx, double *cosx)

math.h (GNU): Trigonometric Functions.

void sincosf (float x, float *sinx, float *cosx)

math.h (GNU): Trigonometric Functions.

_FloatN sincosfN (_FloatN x, _FloatN *sinx, _FloatN *cosx)

math.h (GNU): Trigonometric Functions.

_FloatNx sincosfNx (_FloatNx x, _FloatNx *sinx, _FloatNx *cosx)

math.h (GNU): Trigonometric Functions.

void sincosl (long double x, long double *sinx, long double *cosx)

math.h (GNU): Trigonometric Functions.

float sinf (float x)

math.h (ISO): Trigonometric Functions.

_FloatN sinfN (_FloatN x)

math.h (TS 18661-3:2015): Trigonometric Functions.

_FloatNx sinfNx (_FloatNx x)

math.h (TS 18661-3:2015): Trigonometric Functions.

double sinh (double x)

math.h (ISO): Hyperbolic Functions.

float sinhf (float x)

math.h (ISO): Hyperbolic Functions.

_FloatN sinhfN (_FloatN x)

math.h (TS 18661-3:2015): Hyperbolic Functions.

_FloatNx sinhfNx (_FloatNx x)

math.h (TS 18661-3:2015): Hyperbolic Functions.

long double sinhl (long double x)

math.h (ISO): Hyperbolic Functions.

long double sinl (long double x)

math.h (ISO): Trigonometric Functions.

size_t

stddef.h (ISO): Important Data Types.

unsigned int sleep (unsigned int seconds)

unistd.h (POSIX.1): Sleeping.

int snprintf (char *s, size_t size, const char *template, …)

stdio.h (GNU): Formatted Output Functions.

struct sockaddr

sys/socket.h (BSD): Address Formats.

struct sockaddr_in

netinet/in.h (BSD): Internet Socket Address Formats.

struct sockaddr_un

sys/un.h (BSD): Details of Local Namespace.

int socket (int namespace, int style, int protocol)

sys/socket.h (BSD): Creating a Socket.

int socketpair (int namespace, int style, int protocol, int filedes[2])

sys/socket.h (BSD): Socket Pairs.

speed_t

termios.h (POSIX.1): Line Speed.

int sprintf (char *s, const char *template, …)

stdio.h (ISO): Formatted Output Functions.

double sqrt (double x)

math.h (ISO): Exponentiation and Logarithms.

float sqrtf (float x)

math.h (ISO): Exponentiation and Logarithms.

_FloatN sqrtfN (_FloatN x)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

_FloatNx sqrtfNx (_FloatNx x)

math.h (TS 18661-3:2015): Exponentiation and Logarithms.

long double sqrtl (long double x)

math.h (ISO): Exponentiation and Logarithms.

void srand (unsigned int seed)

stdlib.h (ISO): ISO C Random Number Functions.

void srand48 (long int seedval)

stdlib.h (SVID): SVID Random Number Function.

int srand48_r (long int seedval, struct drand48_data *buffer)

stdlib.h (GNU): SVID Random Number Function.

void srandom (unsigned int seed)

stdlib.h (BSD): BSD Random Number Functions.

int srandom_r (unsigned int seed, struct random_data *buf)

stdlib.h (GNU): BSD Random Number Functions.

int sscanf (const char *s, const char *template, …)

stdio.h (ISO): Formatted Input Functions.

sighandler_t ssignal (int signum, sighandler_t action)

signal.h (SVID): Basic Signal Handling.

ssize_t

unistd.h (POSIX.1): Input and Output Primitives.

stack_t

signal.h (XPG): Using a Separate Signal Stack.

int stat (const char *filename, struct stat *buf)

sys/stat.h (POSIX.1): Reading the Attributes of a File.

struct stat

sys/stat.h (POSIX.1): The meaning of the File Attributes.

int stat64 (const char *filename, struct stat64 *buf)

sys/stat.h (Unix98): Reading the Attributes of a File.

struct stat64

sys/stat.h (LFS): The meaning of the File Attributes.

FILE * stderr

stdio.h (ISO): Standard Streams.

FILE * stdin

stdio.h (ISO): Standard Streams.

FILE * stdout

stdio.h (ISO): Standard Streams.

int stime (const time_t *newtime)

time.h (SVID): Setting and Adjusting the Time.

time.h (XPG): Setting and Adjusting the Time.

char * stpcpy (char *restrict to, const char *restrict from)

string.h (Unknown origin): Copying Strings and Arrays.

char * stpncpy (char *restrict to, const char *restrict from, size_t size)

string.h (GNU): Truncating Strings while Copying.

int strcasecmp (const char *s1, const char *s2)

string.h (BSD): String/Array Comparison.

char * strcasestr (const char *haystack, const char *needle)

string.h (GNU): Search Functions.

char * strcat (char *restrict to, const char *restrict from)

string.h (ISO): Concatenating Strings.

char * strchr (const char *string, int c)

string.h (ISO): Search Functions.

char * strchrnul (const char *string, int c)

string.h (GNU): Search Functions.

int strcmp (const char *s1, const char *s2)

string.h (ISO): String/Array Comparison.

int strcoll (const char *s1, const char *s2)

string.h (ISO): Collation Functions.

char * strcpy (char *restrict to, const char *restrict from)

string.h (ISO): Copying Strings and Arrays.

size_t strcspn (const char *string, const char *stopset)

string.h (ISO): Search Functions.

char * strdup (const char *s)

string.h (SVID): Copying Strings and Arrays.

char * strdupa (const char *s)

string.h (GNU): Copying Strings and Arrays.

char * strerror (int errnum)

string.h (ISO): Error Messages.

char * strerror_l (int errnum, locale_t locale)

string.h (POSIX): Error Messages.

char * strerror_r (int errnum, char *buf, size_t n)

string.h (GNU): Error Messages.

int strerror_r (int errnum, char *buf, size_t n)

string.h (POSIX): Error Messages.

const char * strerrordesc_np (int errnum)

string.h (GNU): Error Messages.

const char * strerrorname_np (int errnum)

string.h (GNU): Error Messages.

int strfromd (char *restrict string, size_t size, const char *restrict format, double value)

stdlib.h (ISO/IEC TS 18661-1): Printing of Floats.

int strfromf (char *restrict string, size_t size, const char *restrict format, float value)

stdlib.h (ISO/IEC TS 18661-1): Printing of Floats.

int strfromfN (char *restrict string, size_t size, const char *restrict format, _FloatN value)

stdlib.h (ISO/IEC TS 18661-3): Printing of Floats.

int strfromfNx (char *restrict string, size_t size, const char *restrict format, _FloatNx value)

stdlib.h (ISO/IEC TS 18661-3): Printing of Floats.

int strfroml (char *restrict string, size_t size, const char *restrict format, long double value)

stdlib.h (ISO/IEC TS 18661-1): Printing of Floats.

char * strfry (char *string)

string.h (GNU): Shuffling Bytes.

size_t strftime (char *s, size_t size, const char *template, const struct tm *brokentime)

time.h (ISO): Formatting Calendar Time.

size_t strlcat (char *restrict to, const char *restrict from, size_t size)

string.h (BSD): Truncating Strings while Copying.

size_t strlcpy (char *restrict to, const char *restrict from, size_t size)

string.h (BSD): Truncating Strings while Copying.

size_t strlen (const char *s)

string.h (ISO): String Length.

int strncasecmp (const char *s1, const char *s2, size_t n)

string.h (BSD): String/Array Comparison.

char * strncat (char *restrict to, const char *restrict from, size_t size)

string.h (ISO): Truncating Strings while Copying.

int strncmp (const char *s1, const char *s2, size_t size)

string.h (ISO): String/Array Comparison.

char * strncpy (char *restrict to, const char *restrict from, size_t size)

string.h (C90): Truncating Strings while Copying.

char * strndup (const char *s, size_t size)

string.h (GNU): Truncating Strings while Copying.

char * strndupa (const char *s, size_t size)

string.h (GNU): Truncating Strings while Copying.

size_t strnlen (const char *s, size_t maxlen)

string.h (GNU): String Length.

char * strpbrk (const char *string, const char *stopset)

string.h (ISO): Search Functions.

char * strptime (const char *s, const char *fmt, struct tm *tp)

time.h (XPG4): Interpret string according to given format.

char * strrchr (const char *string, int c)

string.h (ISO): Search Functions.

char * strsep (char **string_ptr, const char *delimiter)

string.h (BSD): Finding Tokens in a String.

char * strsignal (int signum)

string.h (GNU): Signal Messages.

size_t strspn (const char *string, const char *skipset)

string.h (ISO): Search Functions.

char * strstr (const char *haystack, const char *needle)

string.h (ISO): Search Functions.

double strtod (const char *restrict string, char **restrict tailptr)

stdlib.h (ISO): Parsing of Floats.

float strtof (const char *string, char **tailptr)

stdlib.h (ISO): Parsing of Floats.

_FloatN strtofN (const char *string, char **tailptr)

stdlib.h (ISO/IEC TS 18661-3): Parsing of Floats.

_FloatNx strtofNx (const char *string, char **tailptr)

stdlib.h (ISO/IEC TS 18661-3): Parsing of Floats.

intmax_t strtoimax (const char *restrict string, char **restrict tailptr, int base)

inttypes.h (ISO): Parsing of Integers.

char * strtok (char *restrict newstring, const char *restrict delimiters)

string.h (ISO): Finding Tokens in a String.

char * strtok_r (char *newstring, const char *delimiters, char **save_ptr)

string.h (POSIX): Finding Tokens in a String.

long int strtol (const char *restrict string, char **restrict tailptr, int base)

stdlib.h (ISO): Parsing of Integers.

long double strtold (const char *string, char **tailptr)

stdlib.h (ISO): Parsing of Floats.

long long int strtoll (const char *restrict string, char **restrict tailptr, int base)

stdlib.h (ISO): Parsing of Integers.

long long int strtoq (const char *restrict string, char **restrict tailptr, int base)

stdlib.h (BSD): Parsing of Integers.

unsigned long int strtoul (const char *restrict string, char **restrict tailptr, int base)

stdlib.h (ISO): Parsing of Integers.

unsigned long long int strtoull (const char *restrict string, char **restrict tailptr, int base)

stdlib.h (ISO): Parsing of Integers.

uintmax_t strtoumax (const char *restrict string, char **restrict tailptr, int base)

inttypes.h (ISO): Parsing of Integers.

unsigned long long int strtouq (const char *restrict string, char **restrict tailptr, int base)

stdlib.h (BSD): Parsing of Integers.

int strverscmp (const char *s1, const char *s2)

string.h (GNU): String/Array Comparison.

size_t strxfrm (char *restrict to, const char *restrict from, size_t size)

string.h (ISO): Collation Functions.

int stty (int filedes, const struct sgttyb *attributes)

sgtty.h (BSD): BSD Terminal Modes.

int swapcontext (ucontext_t *restrict oucp, const ucontext_t *restrict ucp)

ucontext.h (SVID): Complete Context Control.

int swprintf (wchar_t *ws, size_t size, const wchar_t *template, …)

wchar.h (GNU): Formatted Output Functions.

int swscanf (const wchar_t *ws, const wchar_t *template, …)

wchar.h (ISO): Formatted Input Functions.

int symlink (const char *oldname, const char *newname)

unistd.h (BSD): Symbolic Links.

void sync (void)

unistd.h (X/Open): Synchronizing I/O operations.

long int syscall (long int sysno, …)

unistd.h (???): System Calls.

long int sysconf (int parameter)

unistd.h (POSIX.1): Definition of sysconf.

void syslog (int facility_priority, const char *format, …)

syslog.h (BSD): syslog, vsyslog.

int system (const char *command)

stdlib.h (ISO): Running a Command.

sighandler_t sysv_signal (int signum, sighandler_t action)

signal.h (GNU): Basic Signal Handling.

double tan (double x)

math.h (ISO): Trigonometric Functions.

float tanf (float x)

math.h (ISO): Trigonometric Functions.

_FloatN tanfN (_FloatN x)

math.h (TS 18661-3:2015): Trigonometric Functions.

_FloatNx tanfNx (_FloatNx x)

math.h (TS 18661-3:2015): Trigonometric Functions.

double tanh (double x)

math.h (ISO): Hyperbolic Functions.

float tanhf (float x)

math.h (ISO): Hyperbolic Functions.

_FloatN tanhfN (_FloatN x)

math.h (TS 18661-3:2015): Hyperbolic Functions.

_FloatNx tanhfNx (_FloatNx x)

math.h (TS 18661-3:2015): Hyperbolic Functions.

long double tanhl (long double x)

math.h (ISO): Hyperbolic Functions.

long double tanl (long double x)

math.h (ISO): Trigonometric Functions.

int tcdrain (int filedes)

termios.h (POSIX.1): Line Control Functions.

tcflag_t

termios.h (POSIX.1): Terminal Mode Data Types.

int tcflow (int filedes, int action)

termios.h (POSIX.1): Line Control Functions.

int tcflush (int filedes, int queue)

termios.h (POSIX.1): Line Control Functions.

int tcgetattr (int filedes, struct termios *termios-p)

termios.h (POSIX.1): Terminal Mode Functions.

pid_t tcgetpgrp (int filedes)

unistd.h (POSIX.1): Functions for Controlling Terminal Access.

pid_t tcgetsid (int fildes)

termios.h (Unix98): Functions for Controlling Terminal Access.

int tcsendbreak (int filedes, int duration)

termios.h (POSIX.1): Line Control Functions.

int tcsetattr (int filedes, int when, const struct termios *termios-p)

termios.h (POSIX.1): Terminal Mode Functions.

int tcsetpgrp (int filedes, pid_t pgid)

unistd.h (POSIX.1): Functions for Controlling Terminal Access.

void * tdelete (const void *key, void **rootp, comparison_fn_t compar)

search.h (SVID): The tsearch function..

void tdestroy (void *vroot, __free_fn_t freefct)

search.h (GNU): The tsearch function..

long int telldir (DIR *dirstream)

dirent.h (BSD): Random Access in a Directory Stream.

char * tempnam (const char *dir, const char *prefix)

stdio.h (SVID): Temporary Files.

struct termios

termios.h (POSIX.1): Terminal Mode Data Types.

char * textdomain (const char *domainname)

libintl.h (GNU): How to determine which catalog to be used.

void * tfind (const void *key, void *const *rootp, comparison_fn_t compar)

search.h (SVID): The tsearch function..

double tgamma (double x)

math.h (XPG): Special Functions.

math.h (ISO): Special Functions.

float tgammaf (float x)

math.h (XPG): Special Functions.

math.h (ISO): Special Functions.

_FloatN tgammafN (_FloatN x)

math.h (TS 18661-3:2015): Special Functions.

_FloatNx tgammafNx (_FloatNx x)

math.h (TS 18661-3:2015): Special Functions.

long double tgammal (long double x)

math.h (XPG): Special Functions.

math.h (ISO): Special Functions.

int tgkill (pid_t pid, pid_t tid, int signum)

signal.h (Linux): Signaling Another Process.

thrd_busy

threads.h (C11): Return Values.

int thrd_create (thrd_t *thr, thrd_start_t func, void *arg)

threads.h (C11): Creation and Control.

thrd_t thrd_current (void)

threads.h (C11): Creation and Control.

int thrd_detach (thrd_t thr)

threads.h (C11): Creation and Control.

int thrd_equal (thrd_t lhs, thrd_t rhs)

threads.h (C11): Creation and Control.

thrd_error

threads.h (C11): Return Values.

_Noreturn void thrd_exit (int res)

threads.h (C11): Creation and Control.

int thrd_join (thrd_t thr, int *res)

threads.h (C11): Creation and Control.

thrd_nomem

threads.h (C11): Return Values.

int thrd_sleep (const struct timespec *time_point, struct timespec *remaining)

threads.h (C11): Creation and Control.

thrd_start_t

threads.h (C11): Creation and Control.

thrd_success

threads.h (C11): Return Values.

thrd_t

threads.h (C11): Creation and Control.

thrd_timedout

threads.h (C11): Return Values.

void thrd_yield (void)

threads.h (C11): Creation and Control.

thread_local

threads.h (C11): Thread-local Storage.

time_t time (time_t *result)

time.h (ISO): Getting the Time.

time_t

time.h (ISO): Time Types.

time_t timegm (struct tm *brokentime)

time.h (???): Broken-down Time.

time_t timelocal (struct tm *brokentime)

time.h (???): Broken-down Time.

clock_t times (struct tms *buffer)

sys/times.h (POSIX.1): Processor Time Inquiry.

struct timespec

time.h (POSIX.1): Time Types.

struct timeval

sys/time.h (BSD): Time Types.

long int timezone

time.h (SVID): Functions and Variables for Time Zones.

struct tm

time.h (ISO): Time Types.

time.h (ISO): Broken-down Time.

FILE * tmpfile (void)

stdio.h (ISO): Temporary Files.

FILE * tmpfile64 (void)

stdio.h (Unix98): Temporary Files.

char * tmpnam (char *result)

stdio.h (ISO): Temporary Files.

char * tmpnam_r (char *result)

stdio.h (GNU): Temporary Files.

struct tms

sys/times.h (POSIX.1): Processor Time Inquiry.

int toascii (int c)

ctype.h (SVID): Case Conversion.

ctype.h (BSD): Case Conversion.

int tolower (int c)

ctype.h (ISO): Case Conversion.

int totalorder (const double *x, const double *y)

math.h (TS 18661-1:2014): Floating-Point Comparison Functions.

int totalorderf (const float *x, const float *y)

math.h (TS 18661-1:2014): Floating-Point Comparison Functions.

int totalorderfN (const _FloatN *x, const _FloatN *y)

math.h (TS 18661-3:2015): Floating-Point Comparison Functions.

int totalorderfNx (const _FloatNx *x, const _FloatNx *y)

math.h (TS 18661-3:2015): Floating-Point Comparison Functions.

int totalorderl (const long double *x, const long double *y)

math.h (TS 18661-1:2014): Floating-Point Comparison Functions.

int totalordermag (const double *x, const double *y)

math.h (TS 18661-1:2014): Floating-Point Comparison Functions.

int totalordermagf (const float *x, const float *y)

math.h (TS 18661-1:2014): Floating-Point Comparison Functions.

int totalordermagfN (const _FloatN *x, const _FloatN *y)

math.h (TS 18661-3:2015): Floating-Point Comparison Functions.

int totalordermagfNx (const _FloatNx *x, const _FloatNx *y)

math.h (TS 18661-3:2015): Floating-Point Comparison Functions.

int totalordermagl (const long double *x, const long double *y)

math.h (TS 18661-1:2014): Floating-Point Comparison Functions.

int toupper (int c)

ctype.h (ISO): Case Conversion.

wint_t towctrans (wint_t wc, wctrans_t desc)

wctype.h (ISO): Mapping of wide characters..

wint_t towlower (wint_t wc)

wctype.h (ISO): Mapping of wide characters..

wint_t towupper (wint_t wc)

wctype.h (ISO): Mapping of wide characters..

double trunc (double x)

math.h (ISO): Rounding Functions.

int truncate (const char *filename, off_t length)

unistd.h (X/Open): File Size.

int truncate64 (const char *name, off64_t length)

unistd.h (Unix98): File Size.

float truncf (float x)

math.h (ISO): Rounding Functions.

_FloatN truncfN (_FloatN x)

math.h (TS 18661-3:2015): Rounding Functions.

_FloatNx truncfNx (_FloatNx x)

math.h (TS 18661-3:2015): Rounding Functions.

long double truncl (long double x)

math.h (ISO): Rounding Functions.

void * tsearch (const void *key, void **rootp, comparison_fn_t compar)

search.h (SVID): The tsearch function..

int tss_create (tss_t *tss_key, tss_dtor_t destructor)

threads.h (C11): Thread-local Storage.

void tss_delete (tss_t tss_key)

threads.h (C11): Thread-local Storage.

tss_dtor_t

threads.h (C11): Thread-local Storage.

void * tss_get (tss_t tss_key)

threads.h (C11): Thread-local Storage.

int tss_set (tss_t tss_key, void *val)

threads.h (C11): Thread-local Storage.

tss_t

threads.h (C11): Thread-local Storage.

char * ttyname (int filedes)

unistd.h (POSIX.1): Identifying Terminals.

int ttyname_r (int filedes, char *buf, size_t len)

unistd.h (POSIX.1): Identifying Terminals.

void twalk (const void *root, __action_fn_t action)

search.h (SVID): The tsearch function..

void twalk_r (const void *root, void (*action) (const void *key, VISIT which, void *closure), void *closure)

search.h (GNU): The tsearch function..

char * tzname [2]

time.h (POSIX.1): Functions and Variables for Time Zones.

void tzset (void)

time.h (POSIX.1): Functions and Variables for Time Zones.

ucontext_t

ucontext.h (SVID): Complete Context Control.

uintmax_t ufromfp (double x, int round, unsigned int width)

math.h (ISO): Rounding Functions.

uintmax_t ufromfpf (float x, int round, unsigned int width)

math.h (ISO): Rounding Functions.

uintmax_t ufromfpfN (_FloatN x, int round, unsigned int width)

math.h (TS 18661-3:2015): Rounding Functions.

uintmax_t ufromfpfNx (_FloatNx x, int round, unsigned int width)

math.h (TS 18661-3:2015): Rounding Functions.

uintmax_t ufromfpl (long double x, int round, unsigned int width)

math.h (ISO): Rounding Functions.

uintmax_t ufromfpx (double x, int round, unsigned int width)

math.h (ISO): Rounding Functions.

uintmax_t ufromfpxf (float x, int round, unsigned int width)

math.h (ISO): Rounding Functions.

uintmax_t ufromfpxfN (_FloatN x, int round, unsigned int width)

math.h (TS 18661-3:2015): Rounding Functions.

uintmax_t ufromfpxfNx (_FloatNx x, int round, unsigned int width)

math.h (TS 18661-3:2015): Rounding Functions.

uintmax_t ufromfpxl (long double x, int round, unsigned int width)

math.h (ISO): Rounding Functions.

uid_t

sys/types.h (POSIX.1): Reading the Persona of a Process.

long int ulimit (int cmd, …)

ulimit.h (BSD): Limiting Resource Usage.

mode_t umask (mode_t mask)

sys/stat.h (POSIX.1): Assigning File Permissions.

int umount (const char *file)

sys/mount.h (SVID): Mount, Unmount, Remount.

sys/mount.h (GNU): Mount, Unmount, Remount.

int umount2 (const char *file, int flags)

sys/mount.h (GNU): Mount, Unmount, Remount.

int uname (struct utsname *info)

sys/utsname.h (POSIX.1): Platform Type Identification.

int ungetc (int c, FILE *stream)

stdio.h (ISO): Using ungetc To Do Unreading.

wint_t ungetwc (wint_t wc, FILE *stream)

wchar.h (ISO): Using ungetc To Do Unreading.

int unlink (const char *filename)

unistd.h (POSIX.1): Deleting Files.

int unlockpt (int filedes)

stdlib.h (SVID): Allocating Pseudo-Terminals.

stdlib.h (XPG4.2): Allocating Pseudo-Terminals.

int unsetenv (const char *name)

stdlib.h (BSD): Environment Access.

void updwtmp (const char *wtmp_file, const struct utmp *utmp)

utmp.h (SVID): Manipulating the User Accounting Database.

struct utimbuf

utime.h (POSIX.1): File Times.

int utime (const char *filename, const struct utimbuf *times)

utime.h (POSIX.1): File Times.

int utimes (const char *filename, const struct timeval tvp[2])

sys/time.h (BSD): File Times.

int utmpname (const char *file)

utmp.h (SVID): Manipulating the User Accounting Database.

int utmpxname (const char *file)

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

struct utsname

sys/utsname.h (POSIX.1): Platform Type Identification.

type va_arg (va_list ap, type)

stdarg.h (ISO): Argument Access Macros.

void va_copy (va_list dest, va_list src)

stdarg.h (C99): Argument Access Macros.

void va_end (va_list ap)

stdarg.h (ISO): Argument Access Macros.

va_list

stdarg.h (ISO): Argument Access Macros.

void va_start (va_list ap, last-required)

stdarg.h (ISO): Argument Access Macros.

void * valloc (size_t size)

malloc.h (BSD): Allocating Aligned Memory Blocks.

stdlib.h (BSD): Allocating Aligned Memory Blocks.

int vasprintf (char **ptr, const char *template, va_list ap)

stdio.h (GNU): Variable Arguments Output Functions.

void verr (int status, const char *format, va_list ap)

err.h (BSD): Error Messages.

void verrx (int status, const char *format, va_list ap)

err.h (BSD): Error Messages.

int versionsort (const struct dirent **a, const struct dirent **b)

dirent.h (GNU): Scanning the Content of a Directory.

int versionsort64 (const struct dirent64 **a, const struct dirent64 **b)

dirent.h (GNU): Scanning the Content of a Directory.

pid_t vfork (void)

unistd.h (BSD): Creating a Process.

int vfprintf (FILE *stream, const char *template, va_list ap)

stdio.h (ISO): Variable Arguments Output Functions.

int vfscanf (FILE *stream, const char *template, va_list ap)

stdio.h (ISO): Variable Arguments Input Functions.

int vfwprintf (FILE *stream, const wchar_t *template, va_list ap)

wchar.h (ISO): Variable Arguments Output Functions.

int vfwscanf (FILE *stream, const wchar_t *template, va_list ap)

wchar.h (ISO): Variable Arguments Input Functions.

int vlimit (int resource, int limit)

sys/vlimit.h (BSD): Limiting Resource Usage.

int vprintf (const char *template, va_list ap)

stdio.h (ISO): Variable Arguments Output Functions.

int vscanf (const char *template, va_list ap)

stdio.h (ISO): Variable Arguments Input Functions.

int vsnprintf (char *s, size_t size, const char *template, va_list ap)

stdio.h (GNU): Variable Arguments Output Functions.

int vsprintf (char *s, const char *template, va_list ap)

stdio.h (ISO): Variable Arguments Output Functions.

int vsscanf (const char *s, const char *template, va_list ap)

stdio.h (ISO): Variable Arguments Input Functions.

int vswprintf (wchar_t *ws, size_t size, const wchar_t *template, va_list ap)

wchar.h (GNU): Variable Arguments Output Functions.

int vswscanf (const wchar_t *s, const wchar_t *template, va_list ap)

wchar.h (ISO): Variable Arguments Input Functions.

void vsyslog (int facility_priority, const char *format, va_list arglist)

syslog.h (BSD): syslog, vsyslog.

void vwarn (const char *format, va_list ap)

err.h (BSD): Error Messages.

void vwarnx (const char *format, va_list ap)

err.h (BSD): Error Messages.

int vwprintf (const wchar_t *template, va_list ap)

wchar.h (ISO): Variable Arguments Output Functions.

int vwscanf (const wchar_t *template, va_list ap)

wchar.h (ISO): Variable Arguments Input Functions.

pid_t wait (int *status-ptr)

sys/wait.h (POSIX.1): Process Completion.

pid_t wait3 (int *status-ptr, int options, struct rusage *usage)

sys/wait.h (BSD): BSD Process Wait Function.

pid_t wait4 (pid_t pid, int *status-ptr, int options, struct rusage *usage)

sys/wait.h (BSD): Process Completion.

pid_t waitpid (pid_t pid, int *status-ptr, int options)

sys/wait.h (POSIX.1): Process Completion.

void warn (const char *format, …)

err.h (BSD): Error Messages.

void warnx (const char *format, …)

err.h (BSD): Error Messages.

wchar_t

stddef.h (ISO): Introduction to Extended Characters.

wchar_t * wcpcpy (wchar_t *restrict wto, const wchar_t *restrict wfrom)

wchar.h (GNU): Copying Strings and Arrays.

wchar_t * wcpncpy (wchar_t *restrict wto, const wchar_t *restrict wfrom, size_t size)

wchar.h (GNU): Truncating Strings while Copying.

size_t wcrtomb (char *restrict s, wchar_t wc, mbstate_t *restrict ps)

wchar.h (ISO): Converting Single Characters.

int wcscasecmp (const wchar_t *ws1, const wchar_t *ws2)

wchar.h (GNU): String/Array Comparison.

wchar_t * wcscat (wchar_t *restrict wto, const wchar_t *restrict wfrom)

wchar.h (ISO): Concatenating Strings.

wchar_t * wcschr (const wchar_t *wstring, wchar_t wc)

wchar.h (ISO): Search Functions.

wchar_t * wcschrnul (const wchar_t *wstring, wchar_t wc)

wchar.h (GNU): Search Functions.

int wcscmp (const wchar_t *ws1, const wchar_t *ws2)

wchar.h (ISO): String/Array Comparison.

int wcscoll (const wchar_t *ws1, const wchar_t *ws2)

wchar.h (ISO): Collation Functions.

wchar_t * wcscpy (wchar_t *restrict wto, const wchar_t *restrict wfrom)

wchar.h (ISO): Copying Strings and Arrays.

size_t wcscspn (const wchar_t *wstring, const wchar_t *stopset)

wchar.h (ISO): Search Functions.

wchar_t * wcsdup (const wchar_t *ws)

wchar.h (GNU): Copying Strings and Arrays.

size_t wcsftime (wchar_t *s, size_t size, const wchar_t *template, const struct tm *brokentime)

time.h (ISO/Amend1): Formatting Calendar Time.

size_t wcslcat (wchar_t *restrict to, const wchar_t *restrict from, size_t size)

string.h (BSD): Truncating Strings while Copying.

size_t wcslcpy (wchar_t *restrict to, const wchar_t *restrict from, size_t size)

string.h (BSD): Truncating Strings while Copying.

size_t wcslen (const wchar_t *ws)

wchar.h (ISO): String Length.

int wcsncasecmp (const wchar_t *ws1, const wchar_t *s2, size_t n)

wchar.h (GNU): String/Array Comparison.

wchar_t * wcsncat (wchar_t *restrict wto, const wchar_t *restrict wfrom, size_t size)

wchar.h (ISO): Truncating Strings while Copying.

int wcsncmp (const wchar_t *ws1, const wchar_t *ws2, size_t size)

wchar.h (ISO): String/Array Comparison.

wchar_t * wcsncpy (wchar_t *restrict wto, const wchar_t *restrict wfrom, size_t size)

wchar.h (ISO): Truncating Strings while Copying.

size_t wcsnlen (const wchar_t *ws, size_t maxlen)

wchar.h (GNU): String Length.

size_t wcsnrtombs (char *restrict dst, const wchar_t **restrict src, size_t nwc, size_t len, mbstate_t *restrict ps)

wchar.h (GNU): Converting Multibyte and Wide Character Strings.

wchar_t * wcspbrk (const wchar_t *wstring, const wchar_t *stopset)

wchar.h (ISO): Search Functions.

wchar_t * wcsrchr (const wchar_t *wstring, wchar_t wc)

wchar.h (ISO): Search Functions.

size_t wcsrtombs (char *restrict dst, const wchar_t **restrict src, size_t len, mbstate_t *restrict ps)

wchar.h (ISO): Converting Multibyte and Wide Character Strings.

size_t wcsspn (const wchar_t *wstring, const wchar_t *skipset)

wchar.h (ISO): Search Functions.

wchar_t * wcsstr (const wchar_t *haystack, const wchar_t *needle)

wchar.h (ISO): Search Functions.

double wcstod (const wchar_t *restrict string, wchar_t **restrict tailptr)

wchar.h (ISO): Parsing of Floats.

float wcstof (const wchar_t *string, wchar_t **tailptr)

wchar.h (ISO): Parsing of Floats.

_FloatN wcstofN (const wchar_t *string, wchar_t **tailptr)

wchar.h (GNU): Parsing of Floats.

_FloatNx wcstofNx (const wchar_t *string, wchar_t **tailptr)

wchar.h (GNU): Parsing of Floats.

intmax_t wcstoimax (const wchar_t *restrict string, wchar_t **restrict tailptr, int base)

wchar.h (ISO): Parsing of Integers.

wchar_t * wcstok (wchar_t *newstring, const wchar_t *delimiters, wchar_t **save_ptr)

wchar.h (ISO): Finding Tokens in a String.

long int wcstol (const wchar_t *restrict string, wchar_t **restrict tailptr, int base)

wchar.h (ISO): Parsing of Integers.

long double wcstold (const wchar_t *string, wchar_t **tailptr)

wchar.h (ISO): Parsing of Floats.

long long int wcstoll (const wchar_t *restrict string, wchar_t **restrict tailptr, int base)

wchar.h (ISO): Parsing of Integers.

size_t wcstombs (char *string, const wchar_t *wstring, size_t size)

stdlib.h (ISO): Non-reentrant Conversion of Strings.

long long int wcstoq (const wchar_t *restrict string, wchar_t **restrict tailptr, int base)

wchar.h (GNU): Parsing of Integers.

unsigned long int wcstoul (const wchar_t *restrict string, wchar_t **restrict tailptr, int base)

wchar.h (ISO): Parsing of Integers.

unsigned long long int wcstoull (const wchar_t *restrict string, wchar_t **restrict tailptr, int base)

wchar.h (ISO): Parsing of Integers.

uintmax_t wcstoumax (const wchar_t *restrict string, wchar_t **restrict tailptr, int base)

wchar.h (ISO): Parsing of Integers.

unsigned long long int wcstouq (const wchar_t *restrict string, wchar_t **restrict tailptr, int base)

wchar.h (GNU): Parsing of Integers.

wchar_t * wcswcs (const wchar_t *haystack, const wchar_t *needle)

wchar.h (XPG): Search Functions.

size_t wcsxfrm (wchar_t *restrict wto, const wchar_t *wfrom, size_t size)

wchar.h (ISO): Collation Functions.

int wctob (wint_t c)

wchar.h (ISO): Converting Single Characters.

int wctomb (char *string, wchar_t wchar)

stdlib.h (ISO): Non-reentrant Conversion of Single Characters.

wctrans_t wctrans (const char *property)

wctype.h (ISO): Mapping of wide characters..

wctrans_t

wctype.h (ISO): Mapping of wide characters..

wctype_t wctype (const char *property)

wctype.h (ISO): Character class determination for wide characters.

wctype_t

wctype.h (ISO): Character class determination for wide characters.

wint_t

wchar.h (ISO): Introduction to Extended Characters.

wchar_t * wmemchr (const wchar_t *block, wchar_t wc, size_t size)

wchar.h (ISO): Search Functions.

int wmemcmp (const wchar_t *a1, const wchar_t *a2, size_t size)

wchar.h (ISO): String/Array Comparison.

wchar_t * wmemcpy (wchar_t *restrict wto, const wchar_t *restrict wfrom, size_t size)

wchar.h (ISO): Copying Strings and Arrays.

wchar_t * wmemmove (wchar_t *wto, const wchar_t *wfrom, size_t size)

wchar.h (ISO): Copying Strings and Arrays.

wchar_t * wmempcpy (wchar_t *restrict wto, const wchar_t *restrict wfrom, size_t size)

wchar.h (GNU): Copying Strings and Arrays.

wchar_t * wmemset (wchar_t *block, wchar_t wc, size_t size)

wchar.h (ISO): Copying Strings and Arrays.

int wordexp (const char *words, wordexp_t *word-vector-ptr, int flags)

wordexp.h (POSIX.2): Calling wordexp.

wordexp_t

wordexp.h (POSIX.2): Calling wordexp.

void wordfree (wordexp_t *word-vector-ptr)

wordexp.h (POSIX.2): Calling wordexp.

int wprintf (const wchar_t *template, …)

wchar.h (ISO): Formatted Output Functions.

ssize_t write (int filedes, const void *buffer, size_t size)

unistd.h (POSIX.1): Input and Output Primitives.

ssize_t writev (int filedes, const struct iovec *vector, int count)

sys/uio.h (BSD): Fast Scatter-Gather I/O.

int wscanf (const wchar_t *template, …)

wchar.h (ISO): Formatted Input Functions.

double y0 (double x)

math.h (SVID): Special Functions.

float y0f (float x)

math.h (SVID): Special Functions.

_FloatN y0fN (_FloatN x)

math.h (GNU): Special Functions.

_FloatNx y0fNx (_FloatNx x)

math.h (GNU): Special Functions.

long double y0l (long double x)

math.h (SVID): Special Functions.

double y1 (double x)

math.h (SVID): Special Functions.

float y1f (float x)

math.h (SVID): Special Functions.

_FloatN y1fN (_FloatN x)

math.h (GNU): Special Functions.

_FloatNx y1fNx (_FloatNx x)

math.h (GNU): Special Functions.

long double y1l (long double x)

math.h (SVID): Special Functions.

double yn (int n, double x)

math.h (SVID): Special Functions.

float ynf (int n, float x)

math.h (SVID): Special Functions.

_FloatN ynfN (int n, _FloatN x)

math.h (GNU): Special Functions.

_FloatNx ynfNx (int n, _FloatNx x)

math.h (GNU): Special Functions.

long double ynl (int n, long double x)

math.h (SVID): Special Functions.