/* getresgid -- fetch real group ID, effective group ID, and saved-set group ID

   Copyright (C) 2002-2018 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>

/* Fetch the real group ID, effective group ID, and saved-set group ID,

   of the calling process.  */

int

__getresgid (gid_t *rgid, gid_t *egid, gid_t *sgid)

{

  error_t err;

  HURD_CRITICAL_BEGIN;

  __mutex_lock (&_hurd_id.lock);

  err = _hurd_check_ids ();

  if (!err)

    {

      if (_hurd_id.aux.ngids < 1)

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

	err = EGRATUITOUS;

      else

	{

	  gid_t real = _hurd_id.aux.gids[0];

	  *rgid = real;

	  *egid = _hurd_id.gen.ngids < 1 ? real : _hurd_id.gen.gids[0];

	  *sgid = _hurd_id.aux.ngids < 2 ? real : _hurd_id.aux.gids[1];

	}

    }

  __mutex_unlock (&_hurd_id.lock);

  HURD_CRITICAL_END;

  return __hurd_fail (err);

}

libc_hidden_def (__getresgid)

weak_alias (__getresgid, getresgid)