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       1                 :            : /* Create descriptor from file descriptor for processing file.
       2                 :            :    Copyright (C) 2002, 2003, 2004, 2005 Red Hat, Inc.
       3                 :            :    This file is part of elfutils.
       4                 :            :    Written by Ulrich Drepper <drepper@redhat.com>, 2002.
       5                 :            : 
       6                 :            :    This file is free software; you can redistribute it and/or modify
       7                 :            :    it under the terms of either
       8                 :            : 
       9                 :            :      * the GNU Lesser General Public License as published by the Free
      10                 :            :        Software Foundation; either version 3 of the License, or (at
      11                 :            :        your option) any later version
      12                 :            : 
      13                 :            :    or
      14                 :            : 
      15                 :            :      * the GNU General Public License as published by the Free
      16                 :            :        Software Foundation; either version 2 of the License, or (at
      17                 :            :        your option) any later version
      18                 :            : 
      19                 :            :    or both in parallel, as here.
      20                 :            : 
      21                 :            :    elfutils is distributed in the hope that it will be useful, but
      22                 :            :    WITHOUT ANY WARRANTY; without even the implied warranty of
      23                 :            :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      24                 :            :    General Public License for more details.
      25                 :            : 
      26                 :            :    You should have received copies of the GNU General Public License and
      27                 :            :    the GNU Lesser General Public License along with this program.  If
      28                 :            :    not, see <http://www.gnu.org/licenses/>.  */
      29                 :            : 
      30                 :            : #ifdef HAVE_CONFIG_H
      31                 :            : # include <config.h>
      32                 :            : #endif
      33                 :            : 
      34                 :            : #include <errno.h>
      35                 :            : #include <stddef.h>
      36                 :            : #include <sys/stat.h>
      37                 :            : 
      38                 :            : #include <libdwP.h>
      39                 :            : 
      40                 :            : 
      41                 :            : Dwarf *
      42                 :        454 : dwarf_begin (int fd, Dwarf_Cmd cmd)
      43                 :            : {
      44                 :        454 :   Elf *elf;
      45                 :        454 :   Elf_Cmd elfcmd;
      46                 :        454 :   Dwarf *result = NULL;
      47                 :            : 
      48         [ +  - ]:        454 :   switch (cmd)
      49                 :            :     {
      50                 :            :     case DWARF_C_READ:
      51                 :            :       elfcmd = ELF_C_READ_MMAP;
      52                 :            :       break;
      53                 :            :     case DWARF_C_WRITE:
      54                 :            :       elfcmd = ELF_C_WRITE;
      55                 :            :       break;
      56                 :            :     case DWARF_C_RDWR:
      57                 :            :       elfcmd = ELF_C_RDWR;
      58                 :            :       break;
      59                 :          0 :     default:
      60                 :            :       /* No valid mode.  */
      61                 :          0 :       __libdw_seterrno (DWARF_E_INVALID_CMD);
      62                 :          0 :       return NULL;
      63                 :            :     }
      64                 :            : 
      65                 :            :   /* We have to call `elf_version' here since the user might have not
      66                 :            :      done it or initialized libelf with a different version.  This
      67                 :            :      would break libdwarf since we are using the ELF data structures
      68                 :            :      in a certain way.  */
      69                 :        454 :   elf_version (EV_CURRENT);
      70                 :            : 
      71                 :            :   /* Get an ELF descriptor.  */
      72                 :        454 :   elf = elf_begin (fd, elfcmd, NULL);
      73         [ -  + ]:        454 :   if (elf == NULL)
      74                 :            :     {
      75                 :            :       /* Test why the `elf_begin" call failed.  */
      76                 :          0 :       struct stat st;
      77                 :            : 
      78   [ #  #  #  # ]:          0 :       if (fstat (fd, &st) == 0 && ! S_ISREG (st.st_mode))
      79                 :          0 :         __libdw_seterrno (DWARF_E_NO_REGFILE);
      80         [ #  # ]:          0 :       else if (errno == EBADF)
      81                 :          0 :         __libdw_seterrno (DWARF_E_INVALID_FILE);
      82                 :            :       else
      83                 :          0 :         __libdw_seterrno (DWARF_E_IO_ERROR);
      84                 :            :     }
      85                 :            :   else
      86                 :            :     {
      87                 :            :       /* Do the real work now that we have an ELF descriptor.  */
      88                 :        454 :       result = INTUSE(dwarf_begin_elf) (elf, cmd, NULL);
      89                 :            : 
      90                 :            :       /* If this failed, free the resources.  */
      91         [ -  + ]:        454 :       if (result == NULL)
      92                 :          0 :         elf_end (elf);
      93                 :            :       else
      94                 :        454 :         result->free_elf = true;
      95                 :            :     }
      96                 :            : 
      97                 :            :   return result;
      98                 :            : }
      99                 :            : INTDEF(dwarf_begin)