/* 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>/* Get the effective group ID of the calling process.  */gid_t__getegid (){  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)