1/* Definitions for POSIX memory map interface. Linux/generic version. 2 Copyright (C) 1997,2000,2003,2005,2006,2009 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, write to the Free 17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 18 02111-1307 USA. */ 19 20#ifndef _SYS_MMAN_H 21# error "Never use <bits/mman.h> directly; include <sys/mman.h> instead." 22#endif 23 24/* The following definitions basically come from the kernel headers. 25 But the kernel header is not namespace clean. */ 26 27 28/* Protections are chosen from these bits, OR'd together. The 29 implementation does not necessarily support PROT_EXEC or PROT_WRITE 30 without PROT_READ. The only guarantees are that no writing will be 31 allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */ 32 33#define PROT_READ 0x1 /* Page can be read. */ 34#define PROT_WRITE 0x2 /* Page can be written. */ 35#define PROT_EXEC 0x4 /* Page can be executed. */ 36#define PROT_NONE 0x0 /* Page can not be accessed. */ 37#define PROT_GROWSDOWN 0x01000000 /* Extend change to start of 38 growsdown vma (mprotect only). */ 39#define PROT_GROWSUP 0x02000000 /* Extend change to start of 40 growsup vma (mprotect only). */ 41 42/* Sharing types (must choose one and only one of these). */ 43#define MAP_SHARED 0x01 /* Share changes. */ 44#define MAP_PRIVATE 0x02 /* Changes are private. */ 45#ifdef __USE_MISC 46# define MAP_TYPE 0x0f /* Mask for type of mapping. */ 47#endif 48 49/* Other flags. */ 50#define MAP_FIXED 0x10 /* Interpret addr exactly. */ 51#ifdef __USE_MISC 52# define MAP_FILE 0 53# define MAP_ANONYMOUS 0x20 /* Don't use a file. */ 54# define MAP_ANON MAP_ANONYMOUS 55#endif 56 57/* These are Linux-specific. */ 58#ifdef __USE_MISC 59# define MAP_GROWSDOWN 0x00100 /* Stack-like segment. */ 60# define MAP_DENYWRITE 0x00800 /* ETXTBSY */ 61# define MAP_EXECUTABLE 0x01000 /* Mark it as an executable. */ 62# define MAP_LOCKED 0x02000 /* Lock the mapping. */ 63# define MAP_NORESERVE 0x04000 /* Don't check for reservations. */ 64# define MAP_POPULATE 0x08000 /* Populate (prefault) pagetables. */ 65# define MAP_NONBLOCK 0x10000 /* Do not block on IO. */ 66# define MAP_STACK 0x20000 /* Allocation is for a stack. */ 67# define MAP_UNINITIALIZE 0x4000000 /* For anonymous mmap, memory could 68 be uninitialized. */ 69#endif 70 71/* Flags to `msync'. */ 72#define MS_ASYNC 1 /* Sync memory asynchronously. */ 73#define MS_SYNC 4 /* Synchronous memory sync. */ 74#define MS_INVALIDATE 2 /* Invalidate the caches. */ 75 76/* Flags for `mlockall'. */ 77#define MCL_CURRENT 1 /* Lock all currently mapped pages. */ 78#define MCL_FUTURE 2 /* Lock all additions to address 79 space. */ 80 81/* Flags for `mremap'. */ 82#ifdef __USE_GNU 83# define MREMAP_MAYMOVE 1 84# define MREMAP_FIXED 2 85#endif 86 87/* Advice to `madvise'. */ 88#ifdef __USE_BSD 89# define MADV_NORMAL 0 /* No further special treatment. */ 90# define MADV_RANDOM 1 /* Expect random page references. */ 91# define MADV_SEQUENTIAL 2 /* Expect sequential page references. */ 92# define MADV_WILLNEED 3 /* Will need these pages. */ 93# define MADV_DONTNEED 4 /* Don't need these pages. */ 94# define MADV_REMOVE 9 /* Remove these pages and resources. */ 95# define MADV_DONTFORK 10 /* Do not inherit across fork. */ 96# define MADV_DOFORK 11 /* Do inherit across fork. */ 97# define MADV_MERGEABLE 12 /* KSM may merge identical pages. */ 98# define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages. */ 99# define MADV_HWPOISON 100 /* Poison a page for testing. */ 100#endif 101 102/* The POSIX people had to invent similar names for the same things. */ 103#ifdef __USE_XOPEN2K 104# define POSIX_MADV_NORMAL 0 /* No further special treatment. */ 105# define POSIX_MADV_RANDOM 1 /* Expect random page references. */ 106# define POSIX_MADV_SEQUENTIAL 2 /* Expect sequential page references. */ 107# define POSIX_MADV_WILLNEED 3 /* Will need these pages. */ 108# define POSIX_MADV_DONTNEED 4 /* Don't need these pages. */ 109#endif 110