1 | /* Definitions for POSIX memory map interface. Linux generic version. |
2 | Copyright (C) 2001-2024 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 | #ifndef _SYS_MMAN_H |
20 | # error "Never use <bits/mman-linux.h> directly; include <sys/mman.h> instead." |
21 | #endif |
22 | |
23 | /* The following definitions basically come from the kernel headers. |
24 | But the kernel header is not namespace clean. */ |
25 | |
26 | |
27 | /* Protections are chosen from these bits, OR'd together. The |
28 | implementation does not necessarily support PROT_EXEC or PROT_WRITE |
29 | without PROT_READ. The only guarantees are that no writing will be |
30 | allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */ |
31 | |
32 | #define PROT_READ 0x1 /* Page can be read. */ |
33 | #define PROT_WRITE 0x2 /* Page can be written. */ |
34 | #define PROT_EXEC 0x4 /* Page can be executed. */ |
35 | #define PROT_NONE 0x0 /* Page can not be accessed. */ |
36 | #define PROT_GROWSDOWN 0x01000000 /* Extend change to start of |
37 | growsdown vma (mprotect only). */ |
38 | #define PROT_GROWSUP 0x02000000 /* Extend change to start of |
39 | growsup vma (mprotect only). */ |
40 | |
41 | /* Sharing types (must choose one and only one of these). */ |
42 | #define MAP_SHARED 0x01 /* Share changes. */ |
43 | #define MAP_PRIVATE 0x02 /* Changes are private. */ |
44 | #define MAP_SHARED_VALIDATE 0x03 /* Share changes and validate |
45 | extension flags. */ |
46 | #define MAP_TYPE 0x0f /* Mask for type of mapping. */ |
47 | |
48 | /* Other flags. */ |
49 | #define MAP_FIXED 0x10 /* Interpret addr exactly. */ |
50 | #define MAP_FILE 0 |
51 | #ifdef __MAP_ANONYMOUS |
52 | # define MAP_ANONYMOUS __MAP_ANONYMOUS /* Don't use a file. */ |
53 | #else |
54 | # define MAP_ANONYMOUS 0x20 /* Don't use a file. */ |
55 | #endif |
56 | #define MAP_ANON MAP_ANONYMOUS |
57 | /* When MAP_HUGETLB is set bits [26:31] encode the log2 of the huge page size. */ |
58 | #define MAP_HUGE_SHIFT 26 |
59 | #define MAP_HUGE_MASK 0x3f |
60 | |
61 | /* Flags to `msync'. */ |
62 | #define MS_ASYNC 1 /* Sync memory asynchronously. */ |
63 | #define MS_SYNC 4 /* Synchronous memory sync. */ |
64 | #define MS_INVALIDATE 2 /* Invalidate the caches. */ |
65 | |
66 | /* Advice to `madvise'. */ |
67 | #ifdef __USE_MISC |
68 | # define MADV_NORMAL 0 /* No further special treatment. */ |
69 | # define MADV_RANDOM 1 /* Expect random page references. */ |
70 | # define MADV_SEQUENTIAL 2 /* Expect sequential page references. */ |
71 | # define MADV_WILLNEED 3 /* Will need these pages. */ |
72 | # define MADV_DONTNEED 4 /* Don't need these pages. */ |
73 | # define MADV_FREE 8 /* Free pages only if memory pressure. */ |
74 | # define MADV_REMOVE 9 /* Remove these pages and resources. */ |
75 | # define MADV_DONTFORK 10 /* Do not inherit across fork. */ |
76 | # define MADV_DOFORK 11 /* Do inherit across fork. */ |
77 | # define MADV_MERGEABLE 12 /* KSM may merge identical pages. */ |
78 | # define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages. */ |
79 | # define MADV_HUGEPAGE 14 /* Worth backing with hugepages. */ |
80 | # define MADV_NOHUGEPAGE 15 /* Not worth backing with hugepages. */ |
81 | # define MADV_DONTDUMP 16 /* Explicitly exclude from the core dump, |
82 | overrides the coredump filter bits. */ |
83 | # define MADV_DODUMP 17 /* Clear the MADV_DONTDUMP flag. */ |
84 | # define MADV_WIPEONFORK 18 /* Zero memory on fork, child only. */ |
85 | # define MADV_KEEPONFORK 19 /* Undo MADV_WIPEONFORK. */ |
86 | # define MADV_COLD 20 /* Deactivate these pages. */ |
87 | # define MADV_PAGEOUT 21 /* Reclaim these pages. */ |
88 | # define MADV_POPULATE_READ 22 /* Populate (prefault) page tables |
89 | readable. */ |
90 | # define MADV_POPULATE_WRITE 23 /* Populate (prefault) page tables |
91 | writable. */ |
92 | # define MADV_DONTNEED_LOCKED 24 /* Like MADV_DONTNEED, but drop |
93 | locked pages too. */ |
94 | # define MADV_COLLAPSE 25 /* Synchronous hugepage collapse. */ |
95 | # define MADV_HWPOISON 100 /* Poison a page for testing. */ |
96 | #endif |
97 | |
98 | /* The POSIX people had to invent similar names for the same things. */ |
99 | #ifdef __USE_XOPEN2K |
100 | # define POSIX_MADV_NORMAL 0 /* No further special treatment. */ |
101 | # define POSIX_MADV_RANDOM 1 /* Expect random page references. */ |
102 | # define POSIX_MADV_SEQUENTIAL 2 /* Expect sequential page references. */ |
103 | # define POSIX_MADV_WILLNEED 3 /* Will need these pages. */ |
104 | # define POSIX_MADV_DONTNEED 4 /* Don't need these pages. */ |
105 | #endif |
106 | |
107 | /* Flags for `mlockall'. */ |
108 | #ifndef MCL_CURRENT |
109 | # define MCL_CURRENT 1 /* Lock all currently mapped pages. */ |
110 | # define MCL_FUTURE 2 /* Lock all additions to address |
111 | space. */ |
112 | # define MCL_ONFAULT 4 /* Lock all pages that are |
113 | faulted in. */ |
114 | #endif |
115 | |
116 | #include <bits/mman-shared.h> |
117 | |