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glibc  2.9
mlock.c
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00001 /* mlock -- guarantee pages are resident in memory.  Mach/Hurd version.
00002    Copyright (C) 2001 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <sys/types.h>
00021 #include <sys/mman.h>
00022 #include <errno.h>
00023 #include <hurd.h>
00024 #include <mach/mach_host.h>
00025 
00026 /* Guarantee all whole pages mapped by the range [ADDR,ADDR+LEN) to
00027    be memory resident.  */
00028 
00029 int
00030 mlock (const void *addr, size_t len)
00031 {
00032   mach_port_t hostpriv;
00033   vm_address_t page;
00034   error_t err;
00035 
00036   err = __get_privileged_ports (&hostpriv, NULL);
00037   if (err)
00038     return __hurd_fail (EPERM);
00039 
00040   page = trunc_page ((vm_address_t) addr);
00041   len = round_page ((vm_address_t) addr + len) - page;
00042   err = __vm_wire (hostpriv, __mach_task_self (), page, len,
00043                  VM_PROT_ALL); /* XXX ? */
00044   __mach_port_deallocate (__mach_task_self (), hostpriv);
00045 
00046   return err ? __hurd_fail (err) : 0;
00047 }