Back to index

glibc  2.9
mman.h
Go to the documentation of this file.
00001 /* Definitions for BSD-style memory management.  Ultrix 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 /* Sharing types (must choose one and only one of these).  */
00033 #define       MAP_SHARED    0x01   /* Share changes.  */
00034 #define       MAP_PRIVATE   0x02   /* Changes private; copy pages on write.  */
00035 #ifdef __USE_BSD
00036 # define MAP_TYPE    0x0f   /* Mask for sharing type.  */
00037 #endif
00038 
00039 /* Other flags.  */
00040 #define       MAP_FIXED     0x10   /* Map address must be exactly as requested. */
00041 
00042 /* Advice to `madvise'.  */
00043 #ifdef __USE_BSD
00044 # define MADV_NORMAL 0      /* No further special treatment.  */
00045 # define MADV_RANDOM 1      /* Expect random page references.  */
00046 # define MADV_SEQUENTIAL    2      /* Expect sequential page references.  */
00047 # define MADV_WILLNEED      3      /* Will need these pages.  */
00048 # define MADV_DONTNEED      4      /* Don't need these pages.  */
00049 #endif
00050 
00051 #endif /* bits/mman.h */