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glibc  2.9
mman.h
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00001 /* Definitions for POSIX memory map interface.  Linux/Alpha version.
00002    Copyright (C) 1997, 1998, 2000, 2003, 2006 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 Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the 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    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    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      0x100              /* Interpret addr exactly.  */
00051 #ifdef __USE_MISC
00052 # define MAP_FILE      0
00053 # define MAP_ANONYMOUS        0x10        /* Don't use a file.  */
00054 # define MAP_ANON      MAP_ANONYMOUS
00055 #endif
00056 
00057 /* Not used by Linux, but here to make sure we don't clash with
00058    OSF/1 defines.  */
00059 #if 0 && defined __USE_BSD
00060 # define MAP_HASSEMAPHORE 0x0200
00061 # define MAP_INHERIT   0x0400
00062 # define MAP_UNALIGNED        0x0800
00063 #endif
00064 
00065 /* These are Linux-specific.  */
00066 #ifdef __USE_MISC
00067 # define MAP_GROWSDOWN        0x01000     /* Stack-like segment.  */
00068 # define MAP_DENYWRITE        0x02000     /* ETXTBSY */
00069 # define MAP_EXECUTABLE       0x04000     /* Mark it as an executable.  */
00070 # define MAP_LOCKED    0x08000     /* Lock the mapping.  */
00071 # define MAP_NORESERVE        0x10000     /* Don't check for reservations.  */
00072 # define MAP_POPULATE         0x20000     /* Populate (prefault) pagetables.  */
00073 # define MAP_NONBLOCK         0x40000     /* Do not block on IO.  */
00074 #endif
00075 
00076 /* Flags to `msync'.  */
00077 #define MS_ASYNC       1           /* Sync memory asynchronously.  */
00078 #define MS_SYNC               2           /* Synchronous memory sync.  */
00079 #define MS_INVALIDATE         4           /* Invalidate the caches.  */
00080 
00081 /* Flags for `mlockall'.  */
00082 #define MCL_CURRENT    8192        /* Lock all currently mapped pages.  */
00083 #define MCL_FUTURE     16384              /* Lock all additions to address
00084                                       space.  */
00085 
00086 /* Flags for `mremap'.  */
00087 #ifdef __USE_GNU
00088 # define MREMAP_MAYMOVE     1
00089 # define MREMAP_FIXED       2
00090 #endif
00091 
00092 /* Advice to `madvise'.  */
00093 #ifdef __USE_BSD
00094 # define MADV_NORMAL     0  /* No further special treatment.  */
00095 # define MADV_RANDOM     1  /* Expect random page references.  */
00096 # define MADV_SEQUENTIAL 2  /* Expect sequential page references.  */
00097 # define MADV_WILLNEED   3  /* Will need these pages.  */
00098 # define MADV_DONTNEED   6  /* Don't need these pages.  */
00099 # define MADV_REMOVE  9     /* Remove these pages and resources.  */
00100 # define MADV_DONTFORK       10    /* Do not inherit across fork.  */
00101 # define MADV_DOFORK  11    /* Do inherit across fork.  */
00102 #endif
00103 
00104 /* The POSIX people had to invent similar names for the same things.  */
00105 #ifdef __USE_XOPEN2K
00106 # define POSIX_MADV_NORMAL  0 /* No further special treatment.  */
00107 # define POSIX_MADV_RANDOM  1 /* Expect random page references.  */
00108 # define POSIX_MADV_SEQUENTIAL     2 /* Expect sequential page references.  */
00109 # define POSIX_MADV_WILLNEED       3 /* Will need these pages.  */
00110 # define POSIX_MADV_DONTNEED       6 /* Don't need these pages.  */
00111 #endif
00112 
00113 /* Not used by Linux, but here to make sure we don't clash with
00114    OSF/1 defines.  */
00115 #if 0 && defined __USE_BSD
00116 # define MADV_DONTNEED_COMPAT 4    /* Old version?  */
00117 # define MADV_SPACEAVAIL 5  /* Ensure resources are available.  */
00118 #endif