sysdeps/mach/hurd/munlock.c

   1 /* munlock -- undo the effects of prior mlock calls.  Mach/Hurd version.
   2    Copyright (C) 2001 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <sys/types.h>
  21 #include <sys/mman.h>
  22 #include <errno.h>
  23 #include <hurd.h>
  24 #include <mach/mach_host.h>
  25
  26 /* Undo the effects on these whole pages of any prior mlock calls.  */
  27
  28 int
  29 munlock (const void *addr, size_t len)
  30 {
  31   mach_port_t hostpriv;
  32   vm_address_t page;
  33   error_t err;
  34
  35   err = __get_privileged_ports (&hostpriv, NULL);
  36   if (err)
  37     return __hurd_fail (EPERM);
  38
  39   page = trunc_page ((vm_address_t) addr);
  40   len = round_page ((vm_address_t) addr + len) - page;
  41   err = __vm_wire (hostpriv, __mach_task_self (), page, len, VM_PROT_NONE);
  42   __mach_port_deallocate (__mach_task_self (), hostpriv);
  43
  44   return err ? __hurd_fail (err) : 0;
  45 }