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28f540f4 | 1 | /* Definitions for BSD-style memory management. Generic/4.4 BSD version. |
0d8733c4 | 2 | Copyright (C) 1994, 1995, 1996, 1997 Free Software Foundation, Inc. |
54d79e99 UD |
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 Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | 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 | Library General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Library General Public | |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
28f540f4 RM |
19 | |
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. */ | |
23 | ||
24 | #ifndef _SYS_MMAN_H | |
25 | ||
26 | #define _SYS_MMAN_H 1 | |
27 | #include <features.h> | |
28 | ||
5107cf1d | 29 | #include <bits/types.h> |
28f540f4 RM |
30 | #define __need_size_t |
31 | #include <stddef.h> | |
32 | ||
33 | ||
34 | /* Protections are chosen from these bits, OR'd together. The | |
35 | implementation does not necessarily support PROT_EXEC or PROT_WRITE | |
36 | without PROT_READ. The only guarantees are that no writing will be | |
37 | allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */ | |
38 | ||
0413b54c UD |
39 | #define PROT_NONE 0x00 /* No access. */ |
40 | #define PROT_READ 0x04 /* Pages can be read. */ | |
41 | #define PROT_WRITE 0x02 /* Pages can be written. */ | |
42 | #define PROT_EXEC 0x01 /* Pages can be executed. */ | |
28f540f4 RM |
43 | |
44 | ||
45 | /* Flags contain mapping type, sharing type and options. */ | |
46 | ||
47 | /* Mapping type (must choose one and only one of these). */ | |
0413b54c UD |
48 | #ifdef __USE_BSD |
49 | # define MAP_FILE 0x0001 /* Mapped from a file or device. */ | |
50 | # define MAP_ANON 0x0002 /* Allocated from anonymous virtual memory. */ | |
51 | # define MAP_TYPE 0x000f /* Mask for type field. */ | |
52 | #endif | |
28f540f4 RM |
53 | |
54 | /* Sharing types (must choose one and only one of these). */ | |
0413b54c UD |
55 | #ifdef __USE_BSD |
56 | # define MAP_COPY 0x0020 /* Virtual copy of region at mapping time. */ | |
57 | #endif | |
58 | #define MAP_SHARED 0x0010 /* Share changes. */ | |
59 | #define MAP_PRIVATE 0x0000 /* Changes private; copy pages on write. */ | |
28f540f4 RM |
60 | |
61 | /* Other flags. */ | |
0413b54c UD |
62 | #define MAP_FIXED 0x0100 /* Map address must be exactly as requested. */ |
63 | #ifdef __USE_BSD | |
64 | # define MAP_NOEXTEND 0x0200 /* For MAP_FILE, don't change file size. */ | |
65 | # define MAP_HASSEMPHORE 0x0400 /* Region may contain semaphores. */ | |
66 | # define MAP_INHERIT 0x0800 /* Region is retained after exec. */ | |
67 | #endif | |
28f540f4 RM |
68 | |
69 | /* Advice to `madvise'. */ | |
0413b54c UD |
70 | #ifdef __USE_BSD |
71 | # define MADV_NORMAL 0 /* No further special treatment. */ | |
72 | # define MADV_RANDOM 1 /* Expect random page references. */ | |
73 | # define MADV_SEQUENTIAL 2 /* Expect sequential page references. */ | |
74 | # define MADV_WILLNEED 3 /* Will need these pages. */ | |
75 | # define MADV_DONTNEED 4 /* Don't need these pages. */ | |
76 | #endif | |
77 | ||
78 | /* Return value of `mmap' in case of an error. */ | |
f2ea0f5b | 79 | #define MAP_FAILED ((__ptr_t) -1) |
28f540f4 | 80 | |
28f540f4 RM |
81 | |
82 | __BEGIN_DECLS | |
83 | /* Map addresses starting near ADDR and extending for LEN bytes. from | |
84 | OFFSET into the file FD describes according to PROT and FLAGS. If ADDR | |
85 | is nonzero, it is the desired mapping address. If the MAP_FIXED bit is | |
86 | set in FLAGS, the mapping will be at ADDR exactly (which must be | |
87 | page-aligned); otherwise the system chooses a convenient nearby address. | |
0413b54c | 88 | The return value is the actual mapping address chosen or MAP_FAILED |
28f540f4 RM |
89 | for errors (in which case `errno' is set). A successful `mmap' call |
90 | deallocates any previous mapping for the affected region. */ | |
91 | ||
f2ea0f5b UD |
92 | extern __ptr_t __mmap __P ((__ptr_t __addr, size_t __len, int __prot, |
93 | int __flags, int __fd, __off_t __offset)); | |
dfd2257a | 94 | #ifndef __USE_FILE_OFFSET64 |
f2ea0f5b UD |
95 | extern __ptr_t mmap __P ((__ptr_t __addr, size_t __len, int __prot, |
96 | int __flags, int __fd, __off_t __offset)); | |
dfd2257a | 97 | #else |
f2ea0f5b UD |
98 | extern __ptr_t mmap __P ((__ptr_t __addr, size_t __len, int __prot, |
99 | int __flags, int __fd, __off_t __offset)) | |
dfd2257a UD |
100 | __asm__ ("mmap64"); |
101 | #endif | |
102 | #ifdef __USE_LARGEFILE64 | |
f2ea0f5b UD |
103 | extern __ptr_t mmap64 __P ((__ptr_t __addr, size_t __len, int __prot, |
104 | int __flags, int __fd, __off64_t __offset)); | |
dfd2257a | 105 | #endif |
28f540f4 RM |
106 | |
107 | /* Deallocate any mapping for the region starting at ADDR and extending LEN | |
108 | bytes. Returns 0 if successful, -1 for errors (and sets errno). */ | |
f2ea0f5b UD |
109 | extern int __munmap __P ((__ptr_t __addr, size_t __len)); |
110 | extern int munmap __P ((__ptr_t __addr, size_t __len)); | |
28f540f4 RM |
111 | |
112 | /* Change the memory protection of the region starting at ADDR and | |
113 | extending LEN bytes to PROT. Returns 0 if successful, -1 for errors | |
114 | (and sets errno). */ | |
f2ea0f5b UD |
115 | extern int __mprotect __P ((__ptr_t __addr, size_t __len, int __prot)); |
116 | extern int mprotect __P ((__ptr_t __addr, size_t __len, int __prot)); | |
28f540f4 RM |
117 | |
118 | /* Synchronize the region starting at ADDR and extending LEN bytes with the | |
119 | file it maps. Filesystem operations on a file being mapped are | |
0d8733c4 | 120 | unpredictable before this is done. Flags are from the MS_* set. */ |
f2ea0f5b | 121 | extern int msync __P ((__ptr_t __addr, size_t __len, int __flags)); |
28f540f4 | 122 | |
0413b54c | 123 | #ifdef __USE_BSD |
28f540f4 RM |
124 | /* Advise the system about particular usage patterns the program follows |
125 | for the region starting at ADDR and extending LEN bytes. */ | |
f2ea0f5b | 126 | extern int madvise __P ((__ptr_t __addr, size_t __len, int __advice)); |
0413b54c | 127 | #endif |
28f540f4 RM |
128 | |
129 | __END_DECLS | |
130 | ||
131 | ||
132 | #endif /* sys/mman.h */ |