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glibc  2.9
mman.h
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00001 /* Definitions for BSD-style memory management.  SunOS 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     0x01   /* Pages can be read.  */
00030 #define       PROT_WRITE    0x02   /* Pages can be written.  */
00031 #define       PROT_EXEC     0x04   /* Pages can be executed.  */
00032 
00033 /* Sharing types (must choose one and only one of these).  */
00034 #define       MAP_SHARED    0x01   /* Share changes.  */
00035 #define       MAP_PRIVATE   0x02   /* Changes private; copy pages on write.  */
00036 #ifdef __USE_BSD
00037 # define MAP_TYPE    0x0f   /* Mask for sharing type.  */
00038 #endif
00039 
00040 /* Other flags.  */
00041 #define       MAP_FIXED     0x10   /* Map address must be exactly as requested. */
00042 /* The following three flags are not actually implemented in SunOS 4.1.  */
00043 #ifdef __USE_BSD
00044 # define MAP_RENAME  0x20   /* Rename private pages to file.  */
00045 # define MAP_NORESERVE      0x40   /* Don't reserve needed swap area.  */
00046 # define MAP_INHERIT 0x80   /* Region is retained after exec.  */
00047 #endif
00048 
00049 /* This is an internal flag that is always set in `mmap' system calls.  In
00050    older versions of SunOS 4 `mmap' did not return the actual mapping
00051    address, but always returned zero.  This flag says to return the
00052    address; the `mmap' C library function always sets it.  */
00053 #define       _MAP_NEW      0x80000000
00054 
00055 /* Advice to `madvise'.  */
00056 #ifdef __USE_BSD
00057 # define MADV_NORMAL 0      /* No further special treatment.  */
00058 # define MADV_RANDOM 1      /* Expect random page references.  */
00059 # define MADV_SEQUENTIAL    2      /* Expect sequential page references.  */
00060 # define MADV_WILLNEED      3      /* Will need these pages.  */
00061 # define MADV_DONTNEED      4      /* Don't need these pages.  */
00062 #endif
00063 
00064 /* Flags to `msync'.  */
00065 #define       MS_ASYNC      0x1           /* Return immediately, don't fsync.  */
00066 #define       MS_INVALIDATE 0x2           /* Invalidate caches.  */
00067 
00068 #endif /* bits/mman.h */