/* Copyright (C) 1993, 1994, 1995, 1997 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, write to the Free   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA   02111-1307 USA.  */#include <errno.h>#include <unistd.h>#include <hurd.h>#include <hurd/id.h>#include <string.h>int__getgroups (n, gidset)     int n;     gid_t *gidset;{  error_t err;  int ngids;  void *crit;  crit = _hurd_critical_section_lock ();  __mutex_lock (&_hurd_id.lock);  if (err = _hurd_check_ids ())    {      __mutex_unlock (&_hurd_id.lock);      _hurd_critical_section_unlock (crit);      return __hurd_fail (err);    }  ngids = _hurd_id.gen.ngids;  if (n != 0)    {      /* Copy the gids onto stack storage and then release the idlock.  */      gid_t gids[ngids];      memcpy (gids, _hurd_id.gen.gids, sizeof (gids));      __mutex_unlock (&_hurd_id.lock);      _hurd_critical_section_unlock (crit);      /* Now that the lock is released, we can safely copy the	 group set into the user's array, which might fault.  */      if (ngids > n)	ngids = n;      memcpy (gidset, gids, ngids * sizeof (gid_t));    }  else    {      __mutex_unlock (&_hurd_id.lock);      _hurd_critical_section_unlock (crit);    }  return ngids;}weak_alias (__getgroups, getgroups)