/* Copyright (C) 1991, 1992 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

#include <ansidecl.h>
#include <errno.h>
#include <unistd.h>
#include <hurd.h>

int
__getgroups (int n, gid_t *gidset)
{
  int ngids;

  __mutex_lock (&_hurd_idlock);
  if (!_hurd_id_valid)
    {
      error_t err = _HURD_PORT_USE (&_hurd_auth,
				    __auth_getids (port, &_hurd_id));
      if (err)
	{
	  __mutex_unlock (&_hurd_idlock);
	  return __hurd_fail (err);
	}
      _hurd_id_valid = 1;
    }
  ngids = _hurd_id.ngroups;
  if (gidset != NULL)
    {
      gid_t gids[ngids];
      memcpy (gids, _hurd_id.groups, sizeof (gids));
      __mutex_unlock (&_hurd_idlock);
      memcpy (gidset, gids, sizeof (gids));
    }
  else
    __mutex_unlock (&_hurd_idlock);

  return ngids;
}