/* `group_member' -- test if process is in a given group.  Hurd version.   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>int__group_member (gid)     gid_t gid;{  int member = 0;  error_t err;  void *crit;  crit = _hurd_critical_section_lock ();  __mutex_lock (&_hurd_id.lock);  err = _hurd_check_ids ();  if (! err)    {      size_t i;      for (i = 0; i < _hurd_id.gen.ngids; ++i)	if (_hurd_id.gen.gids[i] == gid)	  {	    member = 1;	    break;	  }    }  __mutex_unlock (&_hurd_id.lock);  _hurd_critical_section_unlock (crit);  if (err)    __hurd_fail (err);  return member;}weak_alias (__group_member, group_member)