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3d42e04d | 1 | /* Definitions for BSD-style memory management. |
04277e02 | 2 | Copyright (C) 1994-2019 Free Software Foundation, Inc. |
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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 | |
41bdb6e2 AJ |
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. | |
54d79e99 UD |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
54d79e99 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
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16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
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18 | |
19 | /* These are the bits used by 4.4 BSD and its derivatives. On systems | |
20 | (such as GNU) where these facilities are not system services but can be | |
21 | emulated in the C library, these are the definitions we emulate. */ | |
22 | ||
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23 | #ifndef _SYS_MMAN_H |
24 | # error "Never use <bits/mman.h> directly; include <sys/mman.h> instead." | |
25 | #endif | |
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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 | ||
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32 | #define PROT_NONE 0x00 /* No access. */ |
33 | #define PROT_READ 0x04 /* Pages can be read. */ | |
34 | #define PROT_WRITE 0x02 /* Pages can be written. */ | |
35 | #define PROT_EXEC 0x01 /* Pages can be executed. */ | |
28f540f4 | 36 | |
28f540f4 RM |
37 | /* Flags contain mapping type, sharing type and options. */ |
38 | ||
39 | /* Mapping type (must choose one and only one of these). */ | |
498afc54 | 40 | #ifdef __USE_MISC |
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41 | # define MAP_FILE 0x0001 /* Mapped from a file or device. */ |
42 | # define MAP_ANON 0x0002 /* Allocated from anonymous virtual memory. */ | |
43 | # define MAP_TYPE 0x000f /* Mask for type field. */ | |
ed9a38e2 | 44 | # define MAP_ANONYMOUS MAP_ANON /* Linux name. */ |
0413b54c | 45 | #endif |
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46 | |
47 | /* Sharing types (must choose one and only one of these). */ | |
498afc54 | 48 | #ifdef __USE_MISC |
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49 | # define MAP_COPY 0x0020 /* Virtual copy of region at mapping time. */ |
50 | #endif | |
51 | #define MAP_SHARED 0x0010 /* Share changes. */ | |
52 | #define MAP_PRIVATE 0x0000 /* Changes private; copy pages on write. */ | |
28f540f4 RM |
53 | |
54 | /* Other flags. */ | |
0413b54c | 55 | #define MAP_FIXED 0x0100 /* Map address must be exactly as requested. */ |
498afc54 | 56 | #ifdef __USE_MISC |
0413b54c UD |
57 | # define MAP_NOEXTEND 0x0200 /* For MAP_FILE, don't change file size. */ |
58 | # define MAP_HASSEMPHORE 0x0400 /* Region may contain semaphores. */ | |
59 | # define MAP_INHERIT 0x0800 /* Region is retained after exec. */ | |
60 | #endif | |
28f540f4 RM |
61 | |
62 | /* Advice to `madvise'. */ | |
498afc54 | 63 | #ifdef __USE_MISC |
0413b54c UD |
64 | # define MADV_NORMAL 0 /* No further special treatment. */ |
65 | # define MADV_RANDOM 1 /* Expect random page references. */ | |
66 | # define MADV_SEQUENTIAL 2 /* Expect sequential page references. */ | |
67 | # define MADV_WILLNEED 3 /* Will need these pages. */ | |
68 | # define MADV_DONTNEED 4 /* Don't need these pages. */ | |
69 | #endif | |
70 | ||
8f6f7a31 UD |
71 | /* The POSIX people had to invent similar names for the same things. */ |
72 | #ifdef __USE_XOPEN2K | |
73 | # define POSIX_MADV_NORMAL 0 /* No further special treatment. */ | |
74 | # define POSIX_MADV_RANDOM 1 /* Expect random page references. */ | |
75 | # define POSIX_MADV_SEQUENTIAL 2 /* Expect sequential page references. */ | |
76 | # define POSIX_MADV_WILLNEED 3 /* Will need these pages. */ | |
77 | # define POSIX_MADV_DONTNEED 4 /* Don't need these pages. */ | |
78 | #endif | |
d81b986b | 79 | |
3a2832a0 RM |
80 | /* Flags to `msync'. */ |
81 | #define MS_ASYNC 1 /* Sync memory asynchronously. */ | |
82 | #define MS_SYNC 0 /* Synchronous memory sync. */ | |
83 | #define MS_INVALIDATE 2 /* Invalidate the caches. */ | |
d81b986b | 84 | |
d9ed7e21 RM |
85 | /* Flags for `mremap'. */ |
86 | #ifdef __USE_GNU | |
87 | # define MREMAP_MAYMOVE 1 /* Mapping address may change. */ | |
88 | # define MREMAP_FIXED 2 /* Fifth argument sets new address. */ | |
89 | #endif | |
90 | ||
d81b986b RM |
91 | /* Flags for `mlockall' (can be OR'd together). */ |
92 | #define MCL_CURRENT 1 /* Lock all currently mapped pages. */ | |
93 | #define MCL_FUTURE 2 /* Lock all additions to address | |
94 | space. */ |