/* 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 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., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <dirent.h>
#include <dirstream.h>
#include <hurd/fd.h>
#include <errno.h>

int
dirfd (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;
}