libelf/gelf_getshdr.c

   1 /* Return section header.
   2    Copyright (C) 1998, 1999, 2000, 2002 Red Hat, Inc.
   3    Written by Ulrich Drepper <drepper@redhat.com>, 1998.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation, version 2.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software Foundation,
  16    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 #ifdef HAVE_CONFIG_H
  19 # include <config.h>
  20 #endif
  21
  22 #include <gelf.h>
  23 #include <string.h>
  24
  25 #include "libelfP.h"
  26
  27
  28 GElf_Shdr *
  29 gelf_getshdr (scn, dst)
  30      Elf_Scn *scn;
  31      GElf_Shdr *dst;
  32 {
  33   GElf_Shdr *result = NULL;
  34
  35   if (scn == NULL)
  36     return NULL;
  37
  38   if (dst == NULL)
  39     {
  40       __libelf_seterrno (ELF_E_INVALID_OPERAND);
  41       return NULL;
  42     }
  43
  44   rwlock_rdlock (scn->elf->lock);
  45
  46   if (scn->elf->class == ELFCLASS32)
  47     {
  48       /* Copy the elements one-by-one.  */
  49       Elf32_Shdr *shdr = scn->shdr.e32 ?: INTUSE(elf32_getshdr) (scn);
  50
  51       if (shdr == NULL)
  52         {
  53           __libelf_seterrno (ELF_E_INVALID_OPERAND);
  54           goto out;
  55         }
  56
  57 #define COPY(name) \
  58       dst->name = shdr->name
  59       COPY (sh_name);
  60       COPY (sh_type);
  61       COPY (sh_flags);
  62       COPY (sh_addr);
  63       COPY (sh_offset);
  64       COPY (sh_size);
  65       COPY (sh_link);
  66       COPY (sh_info);
  67       COPY (sh_addralign);
  68       COPY (sh_entsize);
  69
  70       result = dst;
  71     }
  72   else
  73     {
  74       Elf64_Shdr *shdr = scn->shdr.e64 ?: INTUSE(elf64_getshdr) (scn);
  75
  76       if (shdr == NULL)
  77         {
  78           __libelf_seterrno (ELF_E_INVALID_OPERAND);
  79           goto out;
  80         }
  81
  82       /* We only have to copy the data.  */
  83       result = memcpy (dst, shdr, sizeof (GElf_Shdr));
  84     }
  85
  86  out:
  87   rwlock_unlock (scn->elf->lock);
  88
  89   return result;
  90 }
  91 INTDEF(gelf_getshdr)