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glibc  2.9
mman.h
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00001 /* Definitions for BSD-style memory management.  Irix 4 version.
00002    Copyright (C) 1994, 1995, 1996, 1997, 1998 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       _BITS_MMAN_H
00021 #define       _BITS_MMAN_H  1
00022 
00023 /* Protections are chosen from these bits, OR'd together.  The
00024    implementation does not necessarily support PROT_EXEC or PROT_WRITE
00025    without PROT_READ.  The only guarantees are that no writing will be
00026    allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */
00027 
00028 #define       PROT_NONE      0x00  /* No access.  */
00029 #define       PROT_READ      0x04  /* Pages can be read.  */
00030 #define       PROT_WRITE     0x02  /* Pages can be written.  */
00031 #define       PROT_EXEC      0x01  /* Pages can be executed.  */
00032 #ifdef __USE_MISC
00033 # define PROT_EXECUTE        PROT_EXEC
00034 #endif
00035 
00036 /* Sharing types (must choose one and only one of these).  */
00037 #define       MAP_SHARED     0x01  /* Share changes.  */
00038 #define       MAP_PRIVATE    0x02  /* Changes private; copy pages on write.  */
00039 #ifdef __USE_BSD
00040 # define MAP_TYPE     0x0f  /* Mask for sharing type.  */
00041 #endif
00042 
00043 /* Other flags.  */
00044 #define       MAP_FIXED      0x10  /* Map address must be exactly as requested. */
00045 #ifdef __USE_MISC
00046 # define MAP_RENAME   0x20  /* Rename private pages to file.  */
00047 # define MAP_AUTOGROW        0x40  /* Grow file as pages are written.  */
00048 # define MAP_LOCAL    0x80  /* Copy the mapped region on fork.  */
00049 #endif
00050 
00051 /* Advice to `madvise'.  */
00052 #ifdef __USE_BSD
00053 # define MADV_NORMAL  0     /* No further special treatment.  */
00054 # define MADV_RANDOM  1     /* Expect random page references.  */
00055 # define MADV_SEQUENTIAL 2  /* Expect sequential page references.  */
00056 # define MADV_WILLNEED       3     /* Will need these pages.  */
00057 # define MADV_DONTNEED       4     /* Don't need these pages.  */
00058 #endif
00059 
00060 /* Flags to `msync'.  */
00061 #define       MS_ASYNC       0x1          /* Return immediately, don't fsync.  */
00062 #define       MS_INVALIDATE  0x2          /* Invalidate caches.  */
00063 
00064 #endif /* bits/mman.h */