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[glibc.git] / bits / mman.h
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1 /* Definitions for BSD-style memory management.
2 Copyright (C) 1994-1998,2000,01,02 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
20 /* These are the bits used by 4.4 BSD and its derivatives. On systems
21 (such as GNU) where these facilities are not system services but can be
22 emulated in the C library, these are the definitions we emulate. */
24 #ifndef _SYS_MMAN_H
25 # error "Never use <bits/mman.h> directly; include <sys/mman.h> instead."
26 #endif
28 /* Protections are chosen from these bits, OR'd together. The
29 implementation does not necessarily support PROT_EXEC or PROT_WRITE
30 without PROT_READ. The only guarantees are that no writing will be
31 allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */
33 #define PROT_NONE 0x00 /* No access. */
34 #define PROT_READ 0x04 /* Pages can be read. */
35 #define PROT_WRITE 0x02 /* Pages can be written. */
36 #define PROT_EXEC 0x01 /* Pages can be executed. */
38 /* Flags contain mapping type, sharing type and options. */
40 /* Mapping type (must choose one and only one of these). */
41 #ifdef __USE_BSD
42 # define MAP_FILE 0x0001 /* Mapped from a file or device. */
43 # define MAP_ANON 0x0002 /* Allocated from anonymous virtual memory. */
44 # define MAP_TYPE 0x000f /* Mask for type field. */
45 # ifdef __USE_MISC
46 # define MAP_ANONYMOUS MAP_ANON /* Linux name. */
47 # endif
48 #endif
50 /* Sharing types (must choose one and only one of these). */
51 #ifdef __USE_BSD
52 # define MAP_COPY 0x0020 /* Virtual copy of region at mapping time. */
53 #endif
54 #define MAP_SHARED 0x0010 /* Share changes. */
55 #define MAP_PRIVATE 0x0000 /* Changes private; copy pages on write. */
57 /* Other flags. */
58 #define MAP_FIXED 0x0100 /* Map address must be exactly as requested. */
59 #ifdef __USE_BSD
60 # define MAP_NOEXTEND 0x0200 /* For MAP_FILE, don't change file size. */
61 # define MAP_HASSEMPHORE 0x0400 /* Region may contain semaphores. */
62 # define MAP_INHERIT 0x0800 /* Region is retained after exec. */
63 #endif
65 /* Advice to `madvise'. */
66 #ifdef __USE_BSD
67 # define MADV_NORMAL 0 /* No further special treatment. */
68 # define MADV_RANDOM 1 /* Expect random page references. */
69 # define MADV_SEQUENTIAL 2 /* Expect sequential page references. */
70 # define MADV_WILLNEED 3 /* Will need these pages. */
71 # define MADV_DONTNEED 4 /* Don't need these pages. */
72 #endif
74 /* The POSIX people had to invent similar names for the same things. */
75 #ifdef __USE_XOPEN2K
76 # define POSIX_MADV_NORMAL 0 /* No further special treatment. */
77 # define POSIX_MADV_RANDOM 1 /* Expect random page references. */
78 # define POSIX_MADV_SEQUENTIAL 2 /* Expect sequential page references. */
79 # define POSIX_MADV_WILLNEED 3 /* Will need these pages. */
80 # define POSIX_MADV_DONTNEED 4 /* Don't need these pages. */
81 #endif
83 /* Flags to `msync'. */
84 #define MS_ASYNC 1 /* Sync memory asynchronously. */
85 #define MS_SYNC 0 /* Synchronous memory sync. */
86 #define MS_INVALIDATE 2 /* Invalidate the caches. */
88 /* Flags for `mlockall' (can be OR'd together). */
89 #define MCL_CURRENT 1 /* Lock all currently mapped pages. */
90 #define MCL_FUTURE 2 /* Lock all additions to address
91 space. */