Line data    Source code

       1             : /* Read header of next archive member.
       2             :    Copyright (C) 1998, 1999, 2000, 2002, 2008, 2015 Red Hat, Inc.
       3             :    This file is part of elfutils.
       4             :    Written 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 <assert.h>
      35             : #include <libelf.h>
      36             : #include <stddef.h>
      37             : 
      38             : #include "libelfP.h"
      39             : 
      40             : 
      41             : Elf_Arhdr *
      42        7232 : elf_getarhdr (Elf *elf)
      43             : {
      44        7232 :   if (elf == NULL)
      45             :     return NULL;
      46             : 
      47        7232 :   Elf *parent = elf->parent;
      48             : 
      49             :   /* Calling this function is not ok for any file type but archives.  */
      50        7232 :   if (parent == NULL)
      51             :     {
      52           0 :       __libelf_seterrno (ELF_E_INVALID_OP);
      53           0 :       return NULL;
      54             :     }
      55             : 
      56             :   /* Make sure we have read the archive header.  */
      57        7232 :   if (parent->state.ar.elf_ar_hdr.ar_name == NULL
      58           0 :       && __libelf_next_arhdr_wrlock (parent) != 0)
      59             :     {
      60             :       rwlock_wrlock (parent->lock);
      61           0 :       int st = __libelf_next_arhdr_wrlock (parent);
      62             :       rwlock_unlock (parent->lock);
      63             : 
      64           0 :       if (st != 0)
      65             :         /* Something went wrong.  Maybe there is no member left.  */
      66             :         return NULL;
      67             :     }
      68             : 
      69             :   /* We can be sure the parent is an archive.  */
      70        7232 :   assert (parent->kind == ELF_K_AR);
      71             : 
      72        7232 :   return &parent->state.ar.elf_ar_hdr;
      73             : }