libelf/elf_version.c

/* Coordinate ELF library and application versions.
   Copyright (C) 1998, 1999, 2000, 2002 Red Hat, Inc.
   Contributed by Ulrich Drepper <drepper@redhat.com>, 1998.

   This program 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.

   This program 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 this program; if not, write to the Free Software Foundation,
   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <libelfP.h>


/* Is the version initialized?  */
int __libelf_version_initialized;

/* Currently selected version.  */
unsigned int __libelf_version = EV_CURRENT;


unsigned int
elf_version (version)
     unsigned int version;
{
  if (version == EV_NONE)
    return __libelf_version;

  if (likely (version < EV_NUM))
    {
      /* Phew, we know this version.  */
      unsigned int last_version = __libelf_version;

      /* Store the new version.  */
      __libelf_version = version;

      /* Signal that the version is now initialized.  */
      __libelf_version_initialized = 1;

      /* And return the last version.  */
      return last_version;
    }

  /* We cannot handle this version.  */
  __libelf_seterrno (ELF_E_UNKNOWN_VERSION);
  return EV_NONE;
}
INTDEF(elf_version)