| /* Definitions for BSD-style memory management. |
| Copyright (C) 1994, 1995, 1996, 1997, 1998 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Library General Public License as |
| published by the Free Software Foundation; either version 2 of the |
| License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Library General Public License for more details. |
| |
| You should have received a copy of the GNU Library General Public |
| License along with the GNU C Library; see the file COPYING.LIB. If not, |
| write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| /* These are the bits used by 4.4 BSD and its derivatives. On systems |
| (such as GNU) where these facilities are not system services but can be |
| emulated in the C library, these are the definitions we emulate. */ |
| |
| #ifndef _BITS_MMAN_H |
| #define _BITS_MMAN_H 1 |
| |
| /* Protections are chosen from these bits, OR'd together. The |
| implementation does not necessarily support PROT_EXEC or PROT_WRITE |
| without PROT_READ. The only guarantees are that no writing will be |
| allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */ |
| |
| #define PROT_NONE 0x00 /* No access. */ |
| #define PROT_READ 0x04 /* Pages can be read. */ |
| #define PROT_WRITE 0x02 /* Pages can be written. */ |
| #define PROT_EXEC 0x01 /* Pages can be executed. */ |
| |
| /* Flags contain mapping type, sharing type and options. */ |
| |
| /* Mapping type (must choose one and only one of these). */ |
| #ifdef __USE_BSD |
| # define MAP_FILE 0x0001 /* Mapped from a file or device. */ |
| # define MAP_ANON 0x0002 /* Allocated from anonymous virtual memory. */ |
| # define MAP_TYPE 0x000f /* Mask for type field. */ |
| #endif |
| |
| /* Sharing types (must choose one and only one of these). */ |
| #ifdef __USE_BSD |
| # define MAP_COPY 0x0020 /* Virtual copy of region at mapping time. */ |
| #endif |
| #define MAP_SHARED 0x0010 /* Share changes. */ |
| #define MAP_PRIVATE 0x0000 /* Changes private; copy pages on write. */ |
| |
| /* Other flags. */ |
| #define MAP_FIXED 0x0100 /* Map address must be exactly as requested. */ |
| #ifdef __USE_BSD |
| # define MAP_NOEXTEND 0x0200 /* For MAP_FILE, don't change file size. */ |
| # define MAP_HASSEMPHORE 0x0400 /* Region may contain semaphores. */ |
| # define MAP_INHERIT 0x0800 /* Region is retained after exec. */ |
| #endif |
| |
| /* Advice to `madvise'. */ |
| #ifdef __USE_BSD |
| # define MADV_NORMAL 0 /* No further special treatment. */ |
| # define MADV_RANDOM 1 /* Expect random page references. */ |
| # define MADV_SEQUENTIAL 2 /* Expect sequential page references. */ |
| # define MADV_WILLNEED 3 /* Will need these pages. */ |
| # define MADV_DONTNEED 4 /* Don't need these pages. */ |
| #endif |
| |
| #endif /* bits/mman.h */ |