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glibc  2.9
dirfd.c
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00001 /* dirfd -- Return the file descriptor used by a DIR stream.  Hurd version.
00002    Copyright (C) 1995, 1996 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <dirent.h>
00021 #include <dirstream.h>
00022 #include <hurd/fd.h>
00023 #include <errno.h>
00024 
00025 int
00026 dirfd (DIR *dirp)
00027 {
00028   int fd;
00029   __mutex_lock (&_hurd_dtable_lock);
00030   for (fd = 0; fd < _hurd_dtablesize; ++fd)
00031     if (_hurd_dtable[fd] == dirp->__fd)
00032       break;
00033   if (fd == _hurd_dtablesize)
00034     {
00035       errno = EINVAL;
00036       fd = -1;
00037     }
00038   __mutex_unlock (&_hurd_dtable_lock);
00039 
00040   return fd;
00041 }