libelf/gelf_update_versym.c

/* Update symbol version information.
   Copyright (C) 2001, 2002 Red Hat, Inc.
   This file is part of Red Hat elfutils.
   Written by Ulrich Drepper <drepper@redhat.com>, 2001.

   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.

   Red Hat elfutils is distributed in the hope that it will be useful, but
   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.

   In addition, as a special exception, Red Hat, Inc. gives You the
   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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   this file solely under the GPL without exception.

   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
   license is granted, either expressly or impliedly, by designation as an
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#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <assert.h>
#include <gelf.h>
#include <stdlib.h>

#include "libelfP.h"


int
gelf_update_versym (data, ndx, src)
     Elf_Data *data;
     int ndx;
     GElf_Versym *src;
{
  Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;

  if (data == NULL)
    return 0;

  /* The types for 32 and 64 bit are the same.  Lucky us.  */
  assert (sizeof (GElf_Versym) == sizeof (Elf32_Versym));
  assert (sizeof (GElf_Versym) == sizeof (Elf64_Versym));

  /* Check whether we have to resize the data buffer.  */
  if (unlikely (ndx < 0)
      || unlikely ((ndx + 1) * sizeof (GElf_Versym) > data_scn->d.d_size))
    {
      __libelf_seterrno (ELF_E_INVALID_INDEX);
      return 0;
    }

  if (unlikely (data_scn->d.d_type != ELF_T_HALF))
    {
      /* The type of the data better should match.  */
      __libelf_seterrno (ELF_E_DATA_MISMATCH);
      return 0;
    }

  rwlock_wrlock (data_scn->s->elf->lock);

  ((GElf_Versym *) data_scn->d.d_buf)[ndx] = *src;

  /* Mark the section as modified.  */
  data_scn->s->flags |= ELF_F_DIRTY;

  rwlock_unlock (data_scn->s->elf->lock);

  return 1;
}