libelf/gelf_getshdr.c

/* Return section header.
   Copyright (C) 1998, 1999, 2000, 2002 Red Hat, Inc.
   This file is part of Red Hat elfutils.
   Written by Ulrich Drepper <drepper@redhat.com>, 1998.

   Red Hat elfutils is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by the
   Free Software Foundation; version 2 of the License.

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   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License along
   with Red Hat elfutils; if not, write to the Free Software Foundation,
   Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.

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   additional right to link the code of Red Hat elfutils with code licensed
   under any Open Source Initiative certified open source license
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   Red Hat elfutils is an included package of the Open Invention Network.
   An included package of the Open Invention Network is a package for which
   Open Invention Network licensees cross-license their patents.  No patent
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#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <gelf.h>
#include <string.h>

#include "libelfP.h"


GElf_Shdr *
gelf_getshdr (scn, dst)
     Elf_Scn *scn;
     GElf_Shdr *dst;
{
  GElf_Shdr *result = NULL;

  if (scn == NULL)
    return NULL;

  if (dst == NULL)
    {
      __libelf_seterrno (ELF_E_INVALID_OPERAND);
      return NULL;
    }

  rwlock_rdlock (scn->elf->lock);

  if (scn->elf->class == ELFCLASS32)
    {
      /* Copy the elements one-by-one.  */
      Elf32_Shdr *shdr
	= scn->shdr.e32 ?: __elf32_getshdr_rdlock (scn);

      if (shdr == NULL)
	{
	  __libelf_seterrno (ELF_E_INVALID_OPERAND);
	  goto out;
	}

#define COPY(name) \
      dst->name = shdr->name
      COPY (sh_name);
      COPY (sh_type);
      COPY (sh_flags);
      COPY (sh_addr);
      COPY (sh_offset);
      COPY (sh_size);
      COPY (sh_link);
      COPY (sh_info);
      COPY (sh_addralign);
      COPY (sh_entsize);

      result = dst;
    }
  else
    {
      Elf64_Shdr *shdr
	= scn->shdr.e64 ?: __elf64_getshdr_rdlock (scn);

      if (shdr == NULL)
	{
	  __libelf_seterrno (ELF_E_INVALID_OPERAND);
	  goto out;
	}

      /* We only have to copy the data.  */
      result = memcpy (dst, shdr, sizeof (GElf_Shdr));
    }

 out:
  rwlock_unlock (scn->elf->lock);

  return result;
}
INTDEF(gelf_getshdr)