| /* Definitions for BSD-style memory management. |
| Copyright (C) 1994-2014 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 Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| /* 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 _SYS_MMAN_H |
| # error "Never use <bits/mman.h> directly; include <sys/mman.h> instead." |
| #endif |
| |
| /* 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. */ |
| # ifdef __USE_MISC |
| # define MAP_ANONYMOUS MAP_ANON /* Linux name. */ |
| # endif |
| #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 |
| |
| /* The POSIX people had to invent similar names for the same things. */ |
| #ifdef __USE_XOPEN2K |
| # define POSIX_MADV_NORMAL 0 /* No further special treatment. */ |
| # define POSIX_MADV_RANDOM 1 /* Expect random page references. */ |
| # define POSIX_MADV_SEQUENTIAL 2 /* Expect sequential page references. */ |
| # define POSIX_MADV_WILLNEED 3 /* Will need these pages. */ |
| # define POSIX_MADV_DONTNEED 4 /* Don't need these pages. */ |
| #endif |
| |
| /* Flags to `msync'. */ |
| #define MS_ASYNC 1 /* Sync memory asynchronously. */ |
| #define MS_SYNC 0 /* Synchronous memory sync. */ |
| #define MS_INVALIDATE 2 /* Invalidate the caches. */ |
| |
| /* Flags for `mremap'. */ |
| #ifdef __USE_GNU |
| # define MREMAP_MAYMOVE 1 /* Mapping address may change. */ |
| # define MREMAP_FIXED 2 /* Fifth argument sets new address. */ |
| #endif |
| |
| /* Flags for `mlockall' (can be OR'd together). */ |
| #define MCL_CURRENT 1 /* Lock all currently mapped pages. */ |
| #define MCL_FUTURE 2 /* Lock all additions to address |
| space. */ |