sysdeps/mach/hurd/munlock.c

   1 /* munlock -- undo the effects of prior mlock calls.  Mach/Hurd version.
   2    Copyright (C) 2001-2015 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <sys/types.h>
  20 #include <sys/mman.h>
  21 #include <errno.h>
  22 #include <hurd.h>
  23 #include <mach/mach_host.h>
  24
  25 /* Undo the effects on these whole pages of any prior mlock calls.  */
  26
  27 int
  28 munlock (const void *addr, size_t len)
  29 {
  30   mach_port_t host;
  31   vm_address_t page;
  32   error_t err;
  33
  34   err = __get_privileged_ports (&host, NULL);
  35   if (err)
  36     host = __mach_host_self();
  37
  38   page = trunc_page ((vm_address_t) addr);
  39   len = round_page ((vm_address_t) addr + len) - page;
  40
  41   err = __vm_wire (host, __mach_task_self (), page, len, VM_PROT_NONE);
  42   if (host != __mach_host_self())
  43     __mach_port_deallocate (__mach_task_self (), host);
  44
  45   return err ? __hurd_fail (err) : 0;
  46 }