1 files changed, 49 insertions, 0 deletions
diff --git a/REORG.TODO/hurd/fchroot.c b/REORG.TODO/hurd/fchroot.c
new file mode 100644
index 0000000000..877a3e9ea6
--- /dev/null
+++ b/REORG.TODO/hurd/fchroot.c
@@ -0,0 +1,49 @@
+/* Copyright (C) 1999-2017 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>
+#include <hurd/port.h>
+
+/* Change the current root directory to FD.  */
+int
+fchroot (int fd)
+{
+  error_t err;
+  file_t dir;
+
+  err = HURD_DPORT_USE (fd,
+			({
+			  dir = __file_name_lookup_under (port, ".", 0, 0);
+			  dir == MACH_PORT_NULL ? errno : 0;
+			}));
+
+  if (! err)
+    {
+      file_t root;
+
+      /* Prevent going through DIR's ..  */
+      err = __file_reparent (dir, MACH_PORT_NULL, &root);
+      __mach_port_deallocate (__mach_task_self (), dir);
+      if (! err)
+	_hurd_port_set (&_hurd_ports[INIT_PORT_CRDIR], root);
+    }
+
+  return err ? __hurd_fail (err) : 0;
+}