| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* Definitions for BSD-style memory management. |
| 2 | Copyright (C) 1994-2015 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 | <http://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 | #ifdef __USE_MISC |
| 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. */ |
| 44 | # define MAP_ANONYMOUS MAP_ANON /* Linux name. */ |
| 45 | #endif |
| 46 | |
| 47 | /* Sharing types (must choose one and only one of these). */ |
| 48 | #ifdef __USE_MISC |
| 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. */ |
| 53 | |
| 54 | /* Other flags. */ |
| 55 | #define MAP_FIXED 0x0100 /* Map address must be exactly as requested. */ |
| 56 | #ifdef __USE_MISC |
| 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 |
| 61 | |
| 62 | /* Advice to `madvise'. */ |
| 63 | #ifdef __USE_MISC |
| 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 | |
| 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 |
| 79 | |
| 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. */ |
| 84 | |
| 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 | |
| 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. */ |