Hurd: implement syncfs

2012-11-19  Pino Toscano  <toscano.pino@tiscali.it>

	* sysdeps/mach/hurd/syncfs.c: New file.
--- /dev/null
+++ b/sysdeps/mach/hurd/syncfs.c
@@ -0,0 +1,31 @@
+/* Make all changes done to all files on the file system associated
+   with FD actually appear on disk.
+   Copyright (C) 2012 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 Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <unistd.h>
+#include <hurd.h>
+#include <hurd/fd.h>
+
+int
+syncfs (int fd)
+{
+  error_t err = HURD_DPORT_USE (fd, __file_syncfs (port, 1, 0));
+  if (err)
+    return __hurd_dfail (fd, err);
+  return 0;
+}