1/* munlock -- undo the effects of prior mlock calls. Mach/Hurd version.
2 Copyright (C) 2001-2022 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, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <sys/types.h>
20#include <sys/mman.h>
21#include <errno.h>
22#include <hurd.h>
23#include <mach/mach_host.h>
24
25/* Undo the effects on these whole pages of any prior mlock calls. */
26
27int
28munlock (const void *addr, size_t len)
29{
30 mach_port_t host;
31 vm_address_t page;
32 error_t err;
33
34 err = __get_privileged_ports (&host, NULL);
35 if (err)
36 host = __mach_host_self();
37
38 page = trunc_page ((vm_address_t) addr);
39 len = round_page ((vm_address_t) addr + len) - page;
40
41 err = __vm_wire (host, __mach_task_self (), page, len, VM_PROT_NONE);
42 if (host != __mach_host_self())
43 __mach_port_deallocate (__mach_task_self (), host);
44
45 return err ? __hurd_fail (err) : 0;
46}
47

source code of glibc/sysdeps/mach/hurd/munlock.c