sysdeps/mach/hurd/mlock.c

   1 /* mlock -- guarantee pages are resident in memory.  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 /* Guarantee all whole pages mapped by the range [ADDR,ADDR+LEN) to
  27    be memory resident.  */
  28
  29 int
  30 mlock (const void *addr, size_t len)
  31 {
  32   mach_port_t hostpriv;
  33   vm_address_t page;
  34   error_t err;
  35
  36   err = __get_privileged_ports (&hostpriv, NULL);
  37   if (err)
  38     return __hurd_fail (EPERM);
  39
  40   page = trunc_page ((vm_address_t) addr);
  41   len = round_page ((vm_address_t) addr + len) - page;
  42   err = __vm_wire (hostpriv, __mach_task_self (), page, len,
  43                    VM_PROT_ALL); /* XXX ? */
  44   __mach_port_deallocate (__mach_task_self (), hostpriv);
  45
  46   return err ? __hurd_fail (err) : 0;
  47 }