1 /* Definitions for POSIX memory map interface. Linux/MIPS version. 2 Copyright (C) 1997, 2000, 2003, 2004, 2005, 2006 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 0x0800 /* Don't use a file. */ 55 # define MAP_ANON MAP_ANONYMOUS 56 # define MAP_RENAME MAP_ANONYMOUS 57 #endif 58 59 /* These are Linux-specific. */ 60 #ifdef __USE_MISC 61 # define MAP_NORESERVE 0x0400 /* don't check for reservations */ 62 # define MAP_ANONYMOUS 0x0800 /* don't use a file */ 63 # define MAP_GROWSDOWN 0x1000 /* stack-like segment */ 64 # define MAP_DENYWRITE 0x2000 /* ETXTBSY */ 65 # define MAP_EXECUTABLE 0x4000 /* mark it as an executable */ 66 # define MAP_LOCKED 0x8000 /* pages are locked */ 67 # define MAP_POPULATE 0x10000 /* populate (prefault) pagetables */ 68 # define MAP_NONBLOCK 0x20000 /* do not block on IO */ 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 #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