/* mlock -- guarantee pages are resident in memory.  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 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, 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>/* Guarantee all whole pages mapped by the range [ADDR,ADDR+LEN) to   be memory resident.  */intmlock (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_ALL); /* XXX ? */  __mach_port_deallocate (__mach_task_self (), hostpriv);  return err ? __hurd_fail (err) : 0;}