1 | /* mlock -- guarantee pages are resident in memory. 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 | /* Guarantee all whole pages mapped by the range [ADDR,ADDR+LEN) to |
26 | be memory resident. */ |
27 | |
28 | int |
29 | mlock (const void *addr, size_t len) |
30 | { |
31 | mach_port_t host; |
32 | vm_address_t page; |
33 | error_t err; |
34 | |
35 | err = __get_privileged_ports (&host, NULL); |
36 | if (err) |
37 | host = __mach_host_self(); |
38 | |
39 | page = trunc_page ((vm_address_t) addr); |
40 | len = round_page ((vm_address_t) addr + len) - page; |
41 | |
42 | err = __vm_wire (host, __mach_task_self (), page, len, VM_PROT_READ); |
43 | if (host != __mach_host_self()) |
44 | __mach_port_deallocate (__mach_task_self (), host); |
45 | |
46 | return err ? __hurd_fail (err) : 0; |
47 | } |
48 | |