1 /* Definitions for POSIX memory map interface. Linux generic version. 2 Copyright (C) 2001-2015 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 #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 #endif 112