1 /* Definitions for POSIX memory map interface. Linux generic version. 2 Copyright (C) 2001-2018 Free Software Foundation, Inc. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, see 16 <http://www.gnu.org/licenses/>. */ 17 18 #ifndef _SYS_MMAN_H 19 # error "Never use <bits/mman-linux.h> directly; include <sys/mman.h> instead." 20 #endif 21 22 /* The following definitions basically come from the kernel headers. 23 But the kernel header is not namespace clean. */ 24 25 26 /* Protections are chosen from these bits, OR'd together. The 27 implementation does not necessarily support PROT_EXEC or PROT_WRITE 28 without PROT_READ. The only guarantees are that no writing will be 29 allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */ 30 31 #define PROT_READ 0x1 /* Page can be read. */ 32 #define PROT_WRITE 0x2 /* Page can be written. */ 33 #define PROT_EXEC 0x4 /* Page can be executed. */ 34 #define PROT_NONE 0x0 /* Page can not be accessed. */ 35 #define PROT_GROWSDOWN 0x01000000 /* Extend change to start of 36 growsdown vma (mprotect only). */ 37 #define PROT_GROWSUP 0x02000000 /* Extend change to start of 38 growsup vma (mprotect only). */ 39 40 /* Sharing types (must choose one and only one of these). */ 41 #define MAP_SHARED 0x01 /* Share changes. */ 42 #define MAP_PRIVATE 0x02 /* Changes are private. */ 43 #ifdef __USE_MISC 44 # define MAP_TYPE 0x0f /* Mask for type of mapping. */ 45 #endif 46 47 /* Other flags. */ 48 #define MAP_FIXED 0x10 /* Interpret addr exactly. */ 49 # define MAP_FIXED_NOREPLACE 0x100000 /* Used to solve problem with MAP_FIXED */ 50 #ifdef __USE_MISC 51 # define MAP_FILE 0 52 # ifdef __MAP_ANONYMOUS 53 # define MAP_ANONYMOUS __MAP_ANONYMOUS /* Don't use a file. */ 54 # else 55 # define MAP_ANONYMOUS 0x20 /* Don't use a file. */ 56 # endif 57 # define MAP_ANON MAP_ANONYMOUS 58 /* When MAP_HUGETLB is set bits [26:31] encode the log2 of the huge page size. */ 59 # define MAP_HUGE_SHIFT 26 60 # define MAP_HUGE_MASK 0x3f 61 #endif 62 63 /* Flags to `msync'. */ 64 #define MS_ASYNC 1 /* Sync memory asynchronously. */ 65 #define MS_SYNC 4 /* Synchronous memory sync. */ 66 #define MS_INVALIDATE 2 /* Invalidate the caches. */ 67 68 /* Flags for `mremap'. */ 69 #ifdef __USE_GNU 70 # define MREMAP_MAYMOVE 1 71 # define MREMAP_FIXED 2 72 #endif 73 74 /* only define for MMU targets, no-MMU does not support madvise. */ 75 #ifdef __ARCH_USE_MMU__ 76 /* Advice to `madvise'. */ 77 # ifdef __USE_MISC 78 # define MADV_NORMAL 0 /* No further special treatment. */ 79 # define MADV_RANDOM 1 /* Expect random page references. */ 80 # define MADV_SEQUENTIAL 2 /* Expect sequential page references. */ 81 # define MADV_WILLNEED 3 /* Will need these pages. */ 82 # define MADV_DONTNEED 4 /* Don't need these pages. */ 83 # define MADV_FREE 8 /* Free pages only if memory pressure. */ 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_WIPEONFORK 18 /* Zero memory on fork, child only. */ 95 # define MADV_KEEPONFORK 19 /* Undo MADV_WIPEONFORK. */ 96 # define MADV_HWPOISON 100 /* Poison a page for testing. */ 97 # endif 98 99 /* The POSIX people had to invent similar names for the same things. */ 100 # ifdef __USE_XOPEN2K 101 # define POSIX_MADV_NORMAL 0 /* No further special treatment. */ 102 # define POSIX_MADV_RANDOM 1 /* Expect random page references. */ 103 # define POSIX_MADV_SEQUENTIAL 2 /* Expect sequential page references. */ 104 # define POSIX_MADV_WILLNEED 3 /* Will need these pages. */ 105 # define POSIX_MADV_DONTNEED 4 /* Don't need these pages. */ 106 # endif 107 #endif 108 109 /* Flags for `mlockall'. */ 110 #ifndef MCL_CURRENT 111 # define MCL_CURRENT 1 /* Lock all currently mapped pages. */ 112 # define MCL_FUTURE 2 /* Lock all additions to address 113 space. */ 114 # define MCL_ONFAULT 4 /* Lock all pages that are 115 faulted in. */ 116 #endif 117 118 #include <bits/mman-shared.h> 119