1 files changed, 39 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/dirfd.c b/sysdeps/mach/hurd/dirfd.c
new file mode 100644
index 0000000000..366a34079b
--- /dev/null
+++ b/sysdeps/mach/hurd/dirfd.c
@@ -0,0 +1,39 @@
+/* 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>
+
+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;
+}