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glibc  2.9
mman.h
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00001 /* Definitions for POSIX memory map interface.  Linux/AM33 version.
00002    Copyright (C) 1997, 2000, 2001, 2004 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Library General Public License as
00007    published by the Free Software Foundation; either version 2 of the
00008    License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Library General Public License for more details.
00014 
00015    You should have received a copy of the GNU Library General Public
00016    License along with the GNU C Library; see the file COPYING.LIB.  If not,
00017    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
00018    Boston, MA 02111-1307, USA.  */
00019 
00020 #ifndef _SYS_MMAN_H
00021 # error "Never use <bits/mman.h> directly; include <sys/mman.h> instead."
00022 #endif
00023 
00024 /* The following definitions basically come from the kernel headers.
00025    But the kernel header is not namespace clean.  */
00026 
00027 
00028 /* Protections are chosen from these bits, OR'd together.  The
00029    implementation does not necessarily support PROT_EXEC or PROT_WRITE
00030    without PROT_READ.  The only guarantees are that no writing will be
00031    allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */
00032 
00033 #define PROT_READ    0x1           /* Page can be read.  */
00034 #define PROT_WRITE   0x2           /* Page can be written.  */
00035 #define PROT_EXEC    0x4           /* Page can be executed.  */
00036 #define PROT_NONE    0x0           /* Page can not be accessed.  */
00037 #define PROT_GROWSDOWN        0x01000000  /* Extend change to start of
00038                                       growsdown vma (mprotect only).  */
00039 #define PROT_GROWSUP   0x02000000  /* Extend change to start of
00040                                       growsup vma (mprotect only).  */
00041 
00042 /* Sharing types (must choose one and only one of these).  */
00043 #define MAP_SHARED   0x01          /* Share changes.  */
00044 #define MAP_PRIVATE  0x02          /* Changes are private.  */
00045 #ifdef __USE_MISC
00046 # define MAP_TYPE    0x0f          /* Mask for type of mapping.  */
00047 #endif
00048 
00049 /* Other flags.  */
00050 #define MAP_FIXED    0x10          /* Interpret addr exactly.  */
00051 #ifdef __USE_MISC
00052 # define MAP_FILE    0
00053 # define MAP_ANONYMOUS      0x20          /* Don't use a file.  */
00054 # define MAP_ANON    MAP_ANONYMOUS
00055 #endif
00056 
00057 /* These are Linux-specific.  */
00058 #ifdef __USE_MISC
00059 # define MAP_GROWSDOWN      0x0100        /* Stack-like segment.  */
00060 # define MAP_DENYWRITE      0x0800        /* ETXTBSY */
00061 # define MAP_EXECUTABLE     0x1000        /* Mark it as an executable.  */
00062 # define MAP_LOCKED  0x2000        /* Lock the mapping.  */
00063 # define MAP_NORESERVE      0x4000        /* Don't check for reservations.  */
00064 #endif
00065 
00066 /* Flags to `msync'.  */
00067 #define MS_ASYNC     1             /* Sync memory asynchronously.  */
00068 #define MS_SYNC             4             /* Synchronous memory sync.  */
00069 #define MS_INVALIDATE       2             /* Invalidate the caches.  */
00070 
00071 /* Flags for `mlockall'.  */
00072 #define MCL_CURRENT  1             /* Lock all currently mapped pages.  */
00073 #define MCL_FUTURE   2             /* Lock all additions to address
00074                                       space.  */
00075 
00076 /* Flags for `mremap'.  */
00077 #ifdef __USE_GNU
00078 # define MREMAP_MAYMOVE     1
00079 #endif
00080 
00081 /* Advice to `madvise'.  */
00082 #ifdef __USE_BSD
00083 # define MADV_NORMAL  0     /* No further special treatment.  */
00084 # define MADV_RANDOM  1     /* Expect random page references.  */
00085 # define MADV_SEQUENTIAL 2  /* Expect sequential page references.  */
00086 # define MADV_WILLNEED       3     /* Will need these pages.  */
00087 # define MADV_DONTNEED       4     /* Don't need these pages.  */
00088 #endif
00089 
00090 /* The POSIX people had to invent similar names for the same things.  */
00091 #ifdef __USE_XOPEN2K
00092 # define POSIX_MADV_NORMAL  0 /* No further special treatment.  */
00093 # define POSIX_MADV_RANDOM  1 /* Expect random page references.  */
00094 # define POSIX_MADV_SEQUENTIAL     2 /* Expect sequential page references.  */
00095 # define POSIX_MADV_WILLNEED       3 /* Will need these pages.  */
00096 # define POSIX_MADV_DONTNEED       4 /* Don't need these pages.  */
00097 #endif