Warning: This file is not a C or C++ file. It does not have highlighting.
1 | /* Definitions for BSD-style memory management. |
---|---|
2 | Copyright (C) 1994-2024 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 | /* 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 | |
23 | #ifndef _SYS_MMAN_H |
24 | # error "Never use <bits/mman.h> directly; include <sys/mman.h> instead." |
25 | #endif |
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_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. */ |
36 | |
37 | /* Flags contain mapping type, sharing type and options. */ |
38 | |
39 | /* Mapping type (must choose one and only one of these). */ |
40 | #define MAP_FILE 0x0001 /* Mapped from a file or device. */ |
41 | #define MAP_ANON 0x0002 /* Allocated from anonymous virtual memory. */ |
42 | #define MAP_TYPE 0x000f /* Mask for type field. */ |
43 | #define MAP_ANONYMOUS MAP_ANON /* Linux name. */ |
44 | |
45 | /* Sharing types (must choose one and only one of these). */ |
46 | #define MAP_COPY 0x0020 /* Virtual copy of region at mapping time. */ |
47 | #define MAP_SHARED 0x0010 /* Share changes. */ |
48 | #define MAP_PRIVATE 0x0000 /* Changes private; copy pages on write. */ |
49 | |
50 | /* Other flags. */ |
51 | #define MAP_FIXED 0x0100 /* Map address must be exactly as requested. */ |
52 | #define MAP_NOEXTEND 0x0200 /* For MAP_FILE, don't change file size. */ |
53 | #define MAP_HASSEMPHORE 0x0400 /* Region may contain semaphores. */ |
54 | #define MAP_INHERIT 0x0800 /* Region is retained after exec. */ |
55 | |
56 | /* Advice to `madvise'. */ |
57 | #ifdef __USE_MISC |
58 | # define MADV_NORMAL 0 /* No further special treatment. */ |
59 | # define MADV_RANDOM 1 /* Expect random page references. */ |
60 | # define MADV_SEQUENTIAL 2 /* Expect sequential page references. */ |
61 | # define MADV_WILLNEED 3 /* Will need these pages. */ |
62 | # define MADV_DONTNEED 4 /* Don't need these pages. */ |
63 | #endif |
64 | |
65 | /* The POSIX people had to invent similar names for the same things. */ |
66 | #ifdef __USE_XOPEN2K |
67 | # define POSIX_MADV_NORMAL 0 /* No further special treatment. */ |
68 | # define POSIX_MADV_RANDOM 1 /* Expect random page references. */ |
69 | # define POSIX_MADV_SEQUENTIAL 2 /* Expect sequential page references. */ |
70 | # define POSIX_MADV_WILLNEED 3 /* Will need these pages. */ |
71 | # define POSIX_MADV_DONTNEED 4 /* Don't need these pages. */ |
72 | #endif |
73 | |
74 | /* Flags to `msync'. */ |
75 | #define MS_ASYNC 1 /* Sync memory asynchronously. */ |
76 | #define MS_SYNC 0 /* Synchronous memory sync. */ |
77 | #define MS_INVALIDATE 2 /* Invalidate the caches. */ |
78 | |
79 | /* Flags for `mremap'. */ |
80 | #ifdef __USE_GNU |
81 | # define MREMAP_MAYMOVE 1 /* Mapping address may change. */ |
82 | # define MREMAP_FIXED 2 /* Fifth argument sets new address. */ |
83 | #endif |
84 | |
85 | /* Flags for `mlockall' (can be OR'd together). */ |
86 | #define MCL_CURRENT 1 /* Lock all currently mapped pages. */ |
87 | #define MCL_FUTURE 2 /* Lock all additions to address |
88 | space. */ |
89 |
Warning: This file is not a C or C++ file. It does not have highlighting.