xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame^] | 1 | /* Definitions for POSIX memory map interface. Linux generic version. |
| 2 | Copyright (C) 2001-2016 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 | #ifndef _SYS_MMAN_H |
| 20 | # error "Never use <bits/mman-linux.h> directly; include <sys/mman.h> instead." |
| 21 | #endif |
| 22 | |
| 23 | /* The following definitions basically come from the kernel headers. |
| 24 | But the kernel header is not namespace clean. |
| 25 | |
| 26 | This file is also used by some non-Linux configurations of the |
| 27 | GNU C Library, for other systems that use these same bit values. */ |
| 28 | |
| 29 | |
| 30 | /* Protections are chosen from these bits, OR'd together. The |
| 31 | implementation does not necessarily support PROT_EXEC or PROT_WRITE |
| 32 | without PROT_READ. The only guarantees are that no writing will be |
| 33 | allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */ |
| 34 | |
| 35 | #define PROT_READ 0x1 /* Page can be read. */ |
| 36 | #define PROT_WRITE 0x2 /* Page can be written. */ |
| 37 | #define PROT_EXEC 0x4 /* Page can be executed. */ |
| 38 | #define PROT_NONE 0x0 /* Page can not be accessed. */ |
| 39 | #define PROT_GROWSDOWN 0x01000000 /* Extend change to start of |
| 40 | growsdown vma (mprotect only). */ |
| 41 | #define PROT_GROWSUP 0x02000000 /* Extend change to start of |
| 42 | growsup vma (mprotect only). */ |
| 43 | |
| 44 | /* Sharing types (must choose one and only one of these). */ |
| 45 | #define MAP_SHARED 0x01 /* Share changes. */ |
| 46 | #define MAP_PRIVATE 0x02 /* Changes are private. */ |
| 47 | #ifdef __USE_MISC |
| 48 | # define MAP_TYPE 0x0f /* Mask for type of mapping. */ |
| 49 | #endif |
| 50 | |
| 51 | /* Other flags. */ |
| 52 | #define MAP_FIXED 0x10 /* Interpret addr exactly. */ |
| 53 | #ifdef __USE_MISC |
| 54 | # define MAP_FILE 0 |
| 55 | # ifdef __MAP_ANONYMOUS |
| 56 | # define MAP_ANONYMOUS __MAP_ANONYMOUS /* Don't use a file. */ |
| 57 | # else |
| 58 | # define MAP_ANONYMOUS 0x20 /* Don't use a file. */ |
| 59 | # endif |
| 60 | # define MAP_ANON MAP_ANONYMOUS |
| 61 | /* When MAP_HUGETLB is set bits [26:31] encode the log2 of the huge page size. */ |
| 62 | # define MAP_HUGE_SHIFT 26 |
| 63 | # define MAP_HUGE_MASK 0x3f |
| 64 | #endif |
| 65 | |
| 66 | /* Flags to `msync'. */ |
| 67 | #define MS_ASYNC 1 /* Sync memory asynchronously. */ |
| 68 | #define MS_SYNC 4 /* Synchronous memory sync. */ |
| 69 | #define MS_INVALIDATE 2 /* Invalidate the caches. */ |
| 70 | |
| 71 | /* Flags for `mremap'. */ |
| 72 | #ifdef __USE_GNU |
| 73 | # define MREMAP_MAYMOVE 1 |
| 74 | # define MREMAP_FIXED 2 |
| 75 | #endif |
| 76 | |
| 77 | /* Advice to `madvise'. */ |
| 78 | #ifdef __USE_MISC |
| 79 | # define MADV_NORMAL 0 /* No further special treatment. */ |
| 80 | # define MADV_RANDOM 1 /* Expect random page references. */ |
| 81 | # define MADV_SEQUENTIAL 2 /* Expect sequential page references. */ |
| 82 | # define MADV_WILLNEED 3 /* Will need these pages. */ |
| 83 | # define MADV_DONTNEED 4 /* Don't need these pages. */ |
| 84 | # define MADV_REMOVE 9 /* Remove these pages and resources. */ |
| 85 | # define MADV_DONTFORK 10 /* Do not inherit across fork. */ |
| 86 | # define MADV_DOFORK 11 /* Do inherit across fork. */ |
| 87 | # define MADV_MERGEABLE 12 /* KSM may merge identical pages. */ |
| 88 | # define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages. */ |
| 89 | # define MADV_HUGEPAGE 14 /* Worth backing with hugepages. */ |
| 90 | # define MADV_NOHUGEPAGE 15 /* Not worth backing with hugepages. */ |
| 91 | # define MADV_DONTDUMP 16 /* Explicity exclude from the core dump, |
| 92 | overrides the coredump filter bits. */ |
| 93 | # define MADV_DODUMP 17 /* Clear the MADV_DONTDUMP flag. */ |
| 94 | # define MADV_HWPOISON 100 /* Poison a page for testing. */ |
| 95 | #endif |
| 96 | |
| 97 | /* The POSIX people had to invent similar names for the same things. */ |
| 98 | #ifdef __USE_XOPEN2K |
| 99 | # define POSIX_MADV_NORMAL 0 /* No further special treatment. */ |
| 100 | # define POSIX_MADV_RANDOM 1 /* Expect random page references. */ |
| 101 | # define POSIX_MADV_SEQUENTIAL 2 /* Expect sequential page references. */ |
| 102 | # define POSIX_MADV_WILLNEED 3 /* Will need these pages. */ |
| 103 | # define POSIX_MADV_DONTNEED 4 /* Don't need these pages. */ |
| 104 | #endif |
| 105 | |
| 106 | /* Flags for `mlockall'. */ |
| 107 | #ifndef MCL_CURRENT |
| 108 | # define MCL_CURRENT 1 /* Lock all currently mapped pages. */ |
| 109 | # define MCL_FUTURE 2 /* Lock all additions to address |
| 110 | space. */ |
| 111 | # define MCL_ONFAULT 4 /* Lock all pages that are |
| 112 | faulted in. */ |
| 113 | #endif |