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/* mlock -- guarantee pages are resident in memory. Mach/Hurd version.
Copyright (C) 2001-2021 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, see
<https://www.gnu.org/licenses/>. */
#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. */
int
mlock (const void *addr, size_t len)
{
mach_port_t host;
vm_address_t page;
error_t err;
err = __get_privileged_ports (&host, NULL);
if (err)
host = __mach_host_self();
page = trunc_page ((vm_address_t) addr);
len = round_page ((vm_address_t) addr + len) - page;
err = __vm_wire (host, __mach_task_self (), page, len, VM_PROT_READ);
if (host != __mach_host_self())
__mach_port_deallocate (__mach_task_self (), host);
return err ? __hurd_fail (err) : 0;
}
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