/* dirfd -- Return the file desciptor used by a DIR stream.  Hurd version.
Copyright (C) 1995 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., 675 Mass Ave,
Cambridge, MA 02139, 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;
}
