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539d8e01 | 1 | /* Definitions for POSIX memory map interface. Linux generic version. |
f7a9f785 | 2 | Copyright (C) 2001-2016 Free Software Foundation, Inc. |
539d8e01 AJ |
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 | <http://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. | |
7d375303 RM |
24 | But the kernel header is not namespace clean. |
25 | ||
26 | This file is also used by some non-Linux configurations of the | |
27 | GNU C Library, for other systems that use these same bit values. */ | |
539d8e01 AJ |
28 | |
29 | ||
30 | /* Protections are chosen from these bits, OR'd together. The | |
31 | implementation does not necessarily support PROT_EXEC or PROT_WRITE | |
32 | without PROT_READ. The only guarantees are that no writing will be | |
33 | allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */ | |
34 | ||
35 | #define PROT_READ 0x1 /* Page can be read. */ | |
36 | #define PROT_WRITE 0x2 /* Page can be written. */ | |
37 | #define PROT_EXEC 0x4 /* Page can be executed. */ | |
38 | #define PROT_NONE 0x0 /* Page can not be accessed. */ | |
39 | #define PROT_GROWSDOWN 0x01000000 /* Extend change to start of | |
40 | growsdown vma (mprotect only). */ | |
41 | #define PROT_GROWSUP 0x02000000 /* Extend change to start of | |
42 | growsup vma (mprotect only). */ | |
43 | ||
44 | /* Sharing types (must choose one and only one of these). */ | |
45 | #define MAP_SHARED 0x01 /* Share changes. */ | |
46 | #define MAP_PRIVATE 0x02 /* Changes are private. */ | |
47 | #ifdef __USE_MISC | |
48 | # define MAP_TYPE 0x0f /* Mask for type of mapping. */ | |
49 | #endif | |
50 | ||
51 | /* Other flags. */ | |
52 | #define MAP_FIXED 0x10 /* Interpret addr exactly. */ | |
53 | #ifdef __USE_MISC | |
54 | # define MAP_FILE 0 | |
664a9ce4 AJ |
55 | # ifdef __MAP_ANONYMOUS |
56 | # define MAP_ANONYMOUS __MAP_ANONYMOUS /* Don't use a file. */ | |
57 | # else | |
58 | # define MAP_ANONYMOUS 0x20 /* Don't use a file. */ | |
59 | # endif | |
539d8e01 | 60 | # define MAP_ANON MAP_ANONYMOUS |
67525cb8 AJ |
61 | /* When MAP_HUGETLB is set bits [26:31] encode the log2 of the huge page size. */ |
62 | # define MAP_HUGE_SHIFT 26 | |
63 | # define MAP_HUGE_MASK 0x3f | |
539d8e01 AJ |
64 | #endif |
65 | ||
66 | /* Flags to `msync'. */ | |
67 | #define MS_ASYNC 1 /* Sync memory asynchronously. */ | |
68 | #define MS_SYNC 4 /* Synchronous memory sync. */ | |
69 | #define MS_INVALIDATE 2 /* Invalidate the caches. */ | |
70 | ||
71 | /* Flags for `mremap'. */ | |
72 | #ifdef __USE_GNU | |
73 | # define MREMAP_MAYMOVE 1 | |
74 | # define MREMAP_FIXED 2 | |
75 | #endif | |
76 | ||
77 | /* Advice to `madvise'. */ | |
498afc54 | 78 | #ifdef __USE_MISC |
539d8e01 AJ |
79 | # define MADV_NORMAL 0 /* No further special treatment. */ |
80 | # define MADV_RANDOM 1 /* Expect random page references. */ | |
81 | # define MADV_SEQUENTIAL 2 /* Expect sequential page references. */ | |
82 | # define MADV_WILLNEED 3 /* Will need these pages. */ | |
83 | # define MADV_DONTNEED 4 /* Don't need these pages. */ | |
84 | # define MADV_REMOVE 9 /* Remove these pages and resources. */ | |
85 | # define MADV_DONTFORK 10 /* Do not inherit across fork. */ | |
86 | # define MADV_DOFORK 11 /* Do inherit across fork. */ | |
87 | # define MADV_MERGEABLE 12 /* KSM may merge identical pages. */ | |
88 | # define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages. */ | |
89 | # define MADV_HUGEPAGE 14 /* Worth backing with hugepages. */ | |
90 | # define MADV_NOHUGEPAGE 15 /* Not worth backing with hugepages. */ | |
91 | # define MADV_DONTDUMP 16 /* Explicity exclude from the core dump, | |
92 | overrides the coredump filter bits. */ | |
93 | # define MADV_DODUMP 17 /* Clear the MADV_DONTDUMP flag. */ | |
94 | # define MADV_HWPOISON 100 /* Poison a page for testing. */ | |
95 | #endif | |
96 | ||
97 | /* The POSIX people had to invent similar names for the same things. */ | |
98 | #ifdef __USE_XOPEN2K | |
99 | # define POSIX_MADV_NORMAL 0 /* No further special treatment. */ | |
100 | # define POSIX_MADV_RANDOM 1 /* Expect random page references. */ | |
101 | # define POSIX_MADV_SEQUENTIAL 2 /* Expect sequential page references. */ | |
102 | # define POSIX_MADV_WILLNEED 3 /* Will need these pages. */ | |
103 | # define POSIX_MADV_DONTNEED 4 /* Don't need these pages. */ | |
104 | #endif | |
890b58d3 AJ |
105 | |
106 | /* Flags for `mlockall'. */ | |
107 | #ifndef MCL_CURRENT | |
108 | # define MCL_CURRENT 1 /* Lock all currently mapped pages. */ | |
109 | # define MCL_FUTURE 2 /* Lock all additions to address | |
110 | space. */ | |
111 | #endif |