/* dirfd -- Return the file descriptor used by a DIR stream.  Hurd version.   Copyright (C) 1995, 1996 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 <dirent.h>#include <dirstream.h>#include <hurd/fd.h>#include <errno.h>intdirfd (DIR *dirp){  int fd;  __mutex_lock (&_hurd_dtable_lock);  for (fd = 0; fd < _hurd_dtablesize; ++fd)    if (_hurd_dtable[fd] == dirp->__fd)      break;  if (fd == _hurd_dtablesize)    {      errno = EINVAL;      fd = -1;    }  __mutex_unlock (&_hurd_dtable_lock);  return fd;}