1 files changed, 45 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/munlock.c b/sysdeps/mach/hurd/munlock.c
new file mode 100644
index 0000000000..a91f9f0986
--- /dev/null
+++ b/sysdeps/mach/hurd/munlock.c
@@ -0,0 +1,45 @@
+/* munlock -- undo the effects of prior mlock calls.  Mach/Hurd version.
+   Copyright (C) 2001 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., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <errno.h>
+#include <hurd.h>
+#include <mach/mach_host.h>
+
+/* Undo the effects on these whole pages of any prior mlock calls.  */
+
+int
+munlock (const void *addr, size_t len)
+{
+  mach_port_t hostpriv;
+  vm_address_t page;
+  error_t err;
+
+  err = __get_privileged_ports (&hostpriv, NULL);
+  if (err)
+    return __hurd_fail (EPERM);
+
+  page = trunc_page ((vm_address_t) addr);
+  len = round_page ((vm_address_t) addr + len) - page;
+  err = __vm_wire (hostpriv, __mach_task_self (), page, len, VM_PROT_NONE);
+  __mach_port_deallocate (__mach_task_self (), hostpriv);
+
+  return err ? __hurd_fail (err) : 0;
+}