1 /* dirfd -- Return the file descriptor used by a DIR stream.  Hurd version.
2    Copyright (C) 1995-2022 Free Software Foundation, Inc.
3    This file is part of the GNU C Library.
4 
5    The GNU C Library is free software; you can redistribute it and/or
6    modify it under the terms of the GNU Lesser General Public
7    License as published by the Free Software Foundation; either
8    version 2.1 of the License, or (at your option) any later version.
9 
10    The GNU C Library is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13    Lesser General Public License for more details.
14 
15    You should have received a copy of the GNU Lesser General Public
16    License along with the GNU C Library; if not, see
17    <https://www.gnu.org/licenses/>.  */
18 
19 #include <dirent.h>
20 #include <dirstream.h>
21 #include <hurd/fd.h>
22 #include <errno.h>
23 
24 int
__dirfd(DIR * dirp)25 __dirfd (DIR *dirp)
26 {
27   int fd;
28 
29   HURD_CRITICAL_BEGIN;
30   __mutex_lock (&_hurd_dtable_lock);
31   for (fd = 0; fd < _hurd_dtablesize; ++fd)
32     if (_hurd_dtable[fd] == dirp->__fd)
33       break;
34   if (fd == _hurd_dtablesize)
35     {
36       errno = EINVAL;
37       fd = -1;
38     }
39   __mutex_unlock (&_hurd_dtable_lock);
40   HURD_CRITICAL_END;
41 
42   return fd;
43 }
44 
45 weak_alias (__dirfd, dirfd)
46 libc_hidden_def (dirfd)
47