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glibc  2.9
mman.h
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00001 /* Definitions for POSIX memory map interface.  Linux/ia64 version.
00002    Copyright (C) 1997,1998,2000,2003,2005,2006 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      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        0x00100     /* Stack-like segment.  */
00060 # define MAP_GROWSUP   0x00200     /* Register stack-like segment */
00061 # define MAP_DENYWRITE        0x00800     /* ETXTBSY */
00062 # define MAP_EXECUTABLE       0x01000     /* Mark it as an executable.  */
00063 # define MAP_LOCKED    0x02000     /* Lock the mapping.  */
00064 # define MAP_NORESERVE        0x04000     /* Don't check for reservations.  */
00065 # define MAP_POPULATE         0x08000     /* Populate (prefault) pagetables.  */
00066 # define MAP_NONBLOCK         0x10000     /* Do not block on IO.  */
00067 #endif
00068 
00069 /* Flags to `msync'.  */
00070 #define MS_ASYNC       0x1         /* Sync memory asynchronously.  */
00071 #define MS_INVALIDATE         0x2         /* Invalidate the caches.  */
00072 #define MS_SYNC               0x4         /* Synchronous memory sync.  */
00073 
00074 /* Flags for `mlockall'.  */
00075 #define MCL_CURRENT    0x1         /* Lock all currently mapped pages.  */
00076 #define MCL_FUTURE     0x2         /* Lock all additions to address
00077                                       space.  */
00078 
00079 /* Flags for `mremap'.  */
00080 #ifdef __USE_GNU
00081 # define MREMAP_MAYMOVE     1
00082 # define MREMAP_FIXED       2
00083 #endif
00084 
00085 /* Advice to `madvise'.  */
00086 #ifdef __USE_BSD
00087 # define MADV_NORMAL  0     /* No further special treatment.  */
00088 # define MADV_RANDOM  1     /* Expect random page references.  */
00089 # define MADV_SEQUENTIAL 2  /* Expect sequential page references.  */
00090 # define MADV_WILLNEED       3     /* Will need these pages.  */
00091 # define MADV_DONTNEED       4     /* Don't need these pages.  */
00092 # define MADV_REMOVE  9     /* Remove these pages and resources.  */
00093 # define MADV_DONTFORK       10    /* Do not inherit across fork.  */
00094 # define MADV_DOFORK  11    /* Do inherit across fork.  */
00095 #endif
00096 
00097 /* The POSIX people had to invent similar names for the same things.  */
00098 #ifdef __USE_XOPEN2K
00099 # define POSIX_MADV_NORMAL  0 /* No further special treatment.  */
00100 # define POSIX_MADV_RANDOM  1 /* Expect random page references.  */
00101 # define POSIX_MADV_SEQUENTIAL     2 /* Expect sequential page references.  */
00102 # define POSIX_MADV_WILLNEED       3 /* Will need these pages.  */
00103 # define POSIX_MADV_DONTNEED       4 /* Don't need these pages.  */
00104 #endif