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/* Definitions for BSD-style memory management.
Copyright (C) 1994-2024 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
<https://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). */
#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. */
#define MAP_ANONYMOUS MAP_ANON /* Linux name. */
/* Sharing types (must choose one and only one of these). */
#define MAP_COPY 0x0020 /* Virtual copy of region at mapping time. */
#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. */
#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. */
/* Advice to `madvise'. */
#ifdef __USE_MISC
# 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. */
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