Hurd: provide llistxattr

Add an implementation of llistxattr based on listxattr.

2012-06-13  Pino Toscano  <toscano.pino@tiscali.it>

	* sysdeps/mach/hurd/llistxattr.c: New file, copied from listxattr.c
	with O_NOLINK passed to __file_name_lookup.
--- /dev/null
+++ b/sysdeps/mach/hurd/llistxattr.c
@@ -0,0 +1,36 @@
+/* Access to extended attributes on files.  Hurd version.
+   Copyright (C) 2005-2012 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <errno.h>
+#include <sys/xattr.h>
+#include <hurd.h>
+#include <hurd/xattr.h>
+#include <fcntl.h>
+
+ssize_t
+llistxattr (const char *path, char *list, size_t size)
+{
+  error_t err;
+  file_t port = __file_name_lookup (path, O_NOLINK, 0);
+  if (port == MACH_PORT_NULL)
+    return -1;
+  err = _hurd_xattr_list (port, list, &size);
+  __mach_port_deallocate (__mach_task_self (), port);
+  return err ? __hurd_fail (err) : size;
+}