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- /* Definitions for BSD-style memory management.
- Copyright (C) 1994-1998,2000,01 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, 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 _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 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. */
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