/* Copyright (C) 1993-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <errno.h>

#include <unistd.h>

#include <hurd.h>

#include <hurd/id.h>

/* Get the effective group ID of the calling process.  */

gid_t

__getegid (void)

{

  error_t err;

  gid_t egid;

  HURD_CRITICAL_BEGIN;

  __mutex_lock (&_hurd_id.lock);

  if (err = _hurd_check_ids ())

    {

      errno = err;

      egid = -1;

    }

  else if (_hurd_id.gen.ngids >= 1)

    egid = _hurd_id.gen.gids[0];

  else if (_hurd_id.aux.ngids >= 1)

    /* We have no effective gids.  Return the real gid.  */

    egid = _hurd_id.aux.gids[0];

  else

    {

      /* We do not even have a real gid.  */

      errno = EGRATUITOUS;

      egid = -1;

    }

  __mutex_unlock (&_hurd_id.lock);

  HURD_CRITICAL_END;

  return egid;

}

weak_alias (__getegid, getegid)