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1 : : /* Select specific element in archive. 2 : : Copyright (C) 1998, 1999, 2000, 2002, 2015 Red Hat, Inc. 3 : : This file is part of elfutils. 4 : : Contributed by Ulrich Drepper <drepper@redhat.com>, 1998. 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 <libelf.h> 35 : : #include <stddef.h> 36 : : 37 : : #include "libelfP.h" 38 : : 39 : : 40 : : size_t 41 : 324 : elf_rand (Elf *elf, size_t offset) 42 : : { 43 : : /* Be gratious, the specs demand it. */ 44 [ + - - + ]: 324 : if (elf == NULL || elf->kind != ELF_K_AR) 45 : : return 0; 46 : : 47 : 324 : rwlock_wrlock (elf->lock); 48 : : 49 : : /* Save the old offset and set the offset. */ 50 : 324 : elf->state.ar.offset = elf->start_offset + offset; 51 : : 52 : : /* Get the next archive header. */ 53 [ - + ]: 324 : if (__libelf_next_arhdr_wrlock (elf) != 0) 54 : : { 55 : : /* Mark the archive header as unusable. */ 56 : 0 : elf->state.ar.elf_ar_hdr.ar_name = NULL; 57 : 0 : return 0; 58 : : } 59 : : 60 : : rwlock_unlock (elf->lock); 61 : : 62 : : return offset; 63 : : }