Line data    Source code

       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         155 : elf_rand (Elf *elf, size_t offset)
      42             : {
      43             :   /* Be gratious, the specs demand it.  */
      44         155 :   if (elf == NULL || elf->kind != ELF_K_AR)
      45             :     return 0;
      46             : 
      47         155 :   rwlock_wrlock (elf->lock);
      48             : 
      49             :   /* Save the old offset and set the offset.  */
      50         155 :   elf->state.ar.offset = elf->start_offset + offset;
      51             : 
      52             :   /* Get the next archive header.  */
      53         155 :   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             : }