1 /* Definitions for POSIX memory map interface. Linux/x86_64 version. 2 Copyright (C) 2001,2003,2005,2006,2009,2010,2011 3 Free Software Foundation, Inc. 4 This file is part of the GNU C Library. 5 6 The GNU C Library is free software; you can redistribute it and/or 7 modify it under the terms of the GNU Lesser General Public 8 License as published by the Free Software Foundation; either 9 version 2.1 of the License, or (at your option) any later version. 10 11 The GNU C Library is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 Lesser General Public License for more details. 15 16 You should have received a copy of the GNU Lesser General Public 17 License along with the GNU C Library; if not, write to the Free 18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 19 02111-1307 USA. */ 20 21 #ifndef _SYS_MMAN_H 22 # error "Never use <bits/mman.h> directly; include <sys/mman.h> instead." 23 #endif 24 25 /* The following definitions basically come from the kernel headers. 26 But the kernel header is not namespace clean. */ 27 28 29 /* Protections are chosen from these bits, OR'd together. The 30 implementation does not necessarily support PROT_EXEC or PROT_WRITE 31 without PROT_READ. The only guarantees are that no writing will be 32 allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */ 33 34 #define PROT_READ 0x1 /* Page can be read. */ 35 #define PROT_WRITE 0x2 /* Page can be written. */ 36 #define PROT_EXEC 0x4 /* Page can be executed. */ 37 #define PROT_NONE 0x0 /* Page can not be accessed. */ 38 #define PROT_GROWSDOWN 0x01000000 /* Extend change to start of 39 growsdown vma (mprotect only). */ 40 #define PROT_GROWSUP 0x02000000 /* Extend change to start of 41 growsup vma (mprotect only). */ 42 43 /* Sharing types (must choose one and only one of these). */ 44 #define MAP_SHARED 0x01 /* Share changes. */ 45 #define MAP_PRIVATE 0x02 /* Changes are private. */ 46 #ifdef __USE_MISC 47 # define MAP_TYPE 0x0f /* Mask for type of mapping. */ 48 #endif 49 50 /* Other flags. */ 51 #define MAP_FIXED 0x10 /* Interpret addr exactly. */ 52 #ifdef __USE_MISC 53 # define MAP_FILE 0 54 # define MAP_ANONYMOUS 0x20 /* Don't use a file. */ 55 # define MAP_ANON MAP_ANONYMOUS 56 # define MAP_32BIT 0x40 /* Only give out 32-bit addresses. */ 57 #endif 58 59 /* These are Linux-specific. */ 60 #ifdef __USE_MISC 61 # define MAP_GROWSDOWN 0x00100 /* Stack-like segment. */ 62 # define MAP_DENYWRITE 0x00800 /* ETXTBSY */ 63 # define MAP_EXECUTABLE 0x01000 /* Mark it as an executable. */ 64 # define MAP_LOCKED 0x02000 /* Lock the mapping. */ 65 # define MAP_NORESERVE 0x04000 /* Don't check for reservations. */ 66 # define MAP_POPULATE 0x08000 /* Populate (prefault) pagetables. */ 67 # define MAP_NONBLOCK 0x10000 /* Do not block on IO. */ 68 # define MAP_STACK 0x20000 /* Allocation is for a stack. */ 69 # define MAP_HUGETLB 0x40000 /* Create huge page mapping. */ 70 #endif 71 72 /* Flags to `msync'. */ 73 #define MS_ASYNC 1 /* Sync memory asynchronously. */ 74 #define MS_SYNC 4 /* Synchronous memory sync. */ 75 #define MS_INVALIDATE 2 /* Invalidate the caches. */ 76 77 /* Flags for `mlockall'. */ 78 #define MCL_CURRENT 1 /* Lock all currently mapped pages. */ 79 #define MCL_FUTURE 2 /* Lock all additions to address 80 space. */ 81 82 /* Flags for `mremap'. */ 83 #ifdef __USE_GNU 84 # define MREMAP_MAYMOVE 1 85 # define MREMAP_FIXED 2 86 #endif 87 88 /* Advice to `madvise'. */ 89 #ifdef __USE_BSD 90 # define MADV_NORMAL 0 /* No further special treatment. */ 91 # define MADV_RANDOM 1 /* Expect random page references. */ 92 # define MADV_SEQUENTIAL 2 /* Expect sequential page references. */ 93 # define MADV_WILLNEED 3 /* Will need these pages. */ 94 # define MADV_DONTNEED 4 /* Don't need these pages. */ 95 # define MADV_REMOVE 9 /* Remove these pages and resources. */ 96 # define MADV_DONTFORK 10 /* Do not inherit across fork. */ 97 # define MADV_DOFORK 11 /* Do inherit across fork. */ 98 # define MADV_MERGEABLE 12 /* KSM may merge identical pages. */ 99 # define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages. */ 100 # define MADV_HUGEPAGE 14 /* Worth backing with hugepages. */ 101 # define MADV_NOHUGEPAGE 15 /* Not worth backing with hugepages. */ 102 # define MADV_HWPOISON 100 /* Poison a page for testing. */ 103 #endif 104 105 /* The POSIX people had to invent similar names for the same things. */ 106 #ifdef __USE_XOPEN2K 107 # define POSIX_MADV_NORMAL 0 /* No further special treatment. */ 108 # define POSIX_MADV_RANDOM 1 /* Expect random page references. */ 109 # define POSIX_MADV_SEQUENTIAL 2 /* Expect sequential page references. */ 110 # define POSIX_MADV_WILLNEED 3 /* Will need these pages. */ 111 # define POSIX_MADV_DONTNEED 4 /* Don't need these pages. */ 112 #endif 113
