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glibc  2.9
mman.h
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00001 /* Definitions for POSIX memory map interface.  Linux/MIPS version.
00002    Copyright (C) 1997, 2000, 2003, 2004, 2005, 2006
00003    Free Software Foundation, Inc.
00004    This file is part of the GNU C Library.
00005 
00006    The GNU C Library is free software; you can redistribute it and/or
00007    modify it under the terms of the GNU Lesser General Public
00008    License as published by the Free Software Foundation; either
00009    version 2.1 of the License, or (at your option) any later version.
00010 
00011    The GNU C Library is distributed in the hope that it will be useful,
00012    but WITHOUT ANY WARRANTY; without even the implied warranty of
00013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014    Lesser General Public License for more details.
00015 
00016    You should have received a copy of the GNU Lesser General Public
00017    License along with the GNU C Library; if not, write to the Free
00018    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00019    02111-1307 USA.  */
00020 
00021 #ifndef _SYS_MMAN_H
00022 # error "Never use <bits/mman.h> directly; include <sys/mman.h> instead."
00023 #endif
00024 
00025 /* The following definitions basically come from the kernel headers.
00026    But the kernel header is not namespace clean.  */
00027 
00028 
00029 /* Protections are chosen from these bits, OR'd together.  The
00030    implementation does not necessarily support PROT_EXEC or PROT_WRITE
00031    without PROT_READ.  The only guarantees are that no writing will be
00032    allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */
00033 
00034 #define PROT_READ    0x1           /* Page can be read.  */
00035 #define PROT_WRITE   0x2           /* Page can be written.  */
00036 #define PROT_EXEC    0x4           /* Page can be executed.  */
00037 #define PROT_NONE    0x0           /* Page can not be accessed.  */
00038 #define PROT_GROWSDOWN      0x01000000    /* Extend change to start of
00039                                       growsdown vma (mprotect only).  */
00040 #define PROT_GROWSUP 0x02000000    /* Extend change to start of
00041                                       growsup vma (mprotect only).  */
00042 
00043 /* Sharing types (must choose one and only one of these).  */
00044 #define MAP_SHARED   0x01          /* Share changes.  */
00045 #define MAP_PRIVATE  0x02          /* Changes are private.  */
00046 #ifdef __USE_MISC
00047 # define MAP_TYPE    0x0f          /* Mask for type of mapping.  */
00048 #endif
00049 
00050 /* Other flags.  */
00051 #define MAP_FIXED    0x10          /* Interpret addr exactly.  */
00052 #ifdef __USE_MISC
00053 # define MAP_FILE    0
00054 # define MAP_ANONYMOUS      0x0800        /* Don't use a file.  */
00055 # define MAP_ANON    MAP_ANONYMOUS
00056 # define MAP_RENAME  MAP_ANONYMOUS
00057 #endif
00058 
00059 /* These are Linux-specific.  */
00060 #ifdef __USE_MISC
00061 # define MAP_NORESERVE      0x0400        /* don't check for reservations */
00062 # define MAP_ANONYMOUS      0x0800        /* don't use a file */
00063 # define MAP_GROWSDOWN      0x1000        /* stack-like segment */
00064 # define MAP_DENYWRITE      0x2000        /* ETXTBSY */
00065 # define MAP_EXECUTABLE     0x4000        /* mark it as an executable */
00066 # define MAP_LOCKED  0x8000        /* pages are locked */
00067 # define MAP_POPULATE   0x10000         /* populate (prefault) pagetables */
00068 # define MAP_NONBLOCK   0x20000         /* do not block on IO */
00069 #endif
00070 
00071 /* Flags to `msync'.  */
00072 #define MS_ASYNC     1             /* Sync memory asynchronously.  */
00073 #define MS_SYNC             4             /* Synchronous memory sync.  */
00074 #define MS_INVALIDATE       2             /* Invalidate the caches.  */
00075 
00076 /* Flags for `mlockall'.  */
00077 #define MCL_CURRENT  1             /* Lock all currently mapped pages.  */
00078 #define MCL_FUTURE   2             /* Lock all additions to address
00079                                       space.  */
00080 
00081 /* Flags for `mremap'.  */
00082 #ifdef __USE_GNU
00083 # define MREMAP_MAYMOVE     1
00084 # define MREMAP_FIXED       2
00085 #endif
00086 
00087 /* Advice to `madvise'.  */
00088 #ifdef __USE_BSD
00089 # define MADV_NORMAL  0     /* No further special treatment.  */
00090 # define MADV_RANDOM  1     /* Expect random page references.  */
00091 # define MADV_SEQUENTIAL 2  /* Expect sequential page references.  */
00092 # define MADV_WILLNEED       3     /* Will need these pages.  */
00093 # define MADV_DONTNEED       4     /* Don't need these pages.  */
00094 # define MADV_REMOVE  9     /* Remove these pages and resources.  */
00095 # define MADV_DONTFORK       10    /* Do not inherit across fork.  */
00096 # define MADV_DOFORK  11    /* Do inherit across fork.  */
00097 #endif
00098 
00099 /* The POSIX people had to invent similar names for the same things.  */
00100 #ifdef __USE_XOPEN2K
00101 # define POSIX_MADV_NORMAL  0 /* No further special treatment.  */
00102 # define POSIX_MADV_RANDOM  1 /* Expect random page references.  */
00103 # define POSIX_MADV_SEQUENTIAL     2 /* Expect sequential page references.  */
00104 # define POSIX_MADV_WILLNEED       3 /* Will need these pages.  */
00105 # define POSIX_MADV_DONTNEED       4 /* Don't need these pages.  */
00106 #endif