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/* Definitions for BSD-style memory management. Generic/4.4 BSD version.
Copyright (C) 1994, 1995 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., 675 Mass Ave,
Cambridge, MA 02139, 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
#define _SYS_MMAN_H 1
#include <features.h>
#include <gnu/types.h>
#define __need_size_t
#include <stddef.h>
/* 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. */
/* 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'. */
#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. */
#include <sys/cdefs.h>
__BEGIN_DECLS
/* Map addresses starting near ADDR and extending for LEN bytes. from
OFFSET into the file FD describes according to PROT and FLAGS. If ADDR
is nonzero, it is the desired mapping address. If the MAP_FIXED bit is
set in FLAGS, the mapping will be at ADDR exactly (which must be
page-aligned); otherwise the system chooses a convenient nearby address.
The return value is the actual mapping address chosen or (caddr_t) -1
for errors (in which case `errno' is set). A successful `mmap' call
deallocates any previous mapping for the affected region. */
__caddr_t __mmap __P ((__caddr_t __addr, size_t __len,
int __prot, int __flags, int __fd, __off_t __offset));
__caddr_t mmap __P ((__caddr_t __addr, size_t __len,
int __prot, int __flags, int __fd, __off_t __offset));
/* Deallocate any mapping for the region starting at ADDR and extending LEN
bytes. Returns 0 if successful, -1 for errors (and sets errno). */
int __munmap __P ((__caddr_t __addr, size_t __len));
int munmap __P ((__caddr_t __addr, size_t __len));
/* Change the memory protection of the region starting at ADDR and
extending LEN bytes to PROT. Returns 0 if successful, -1 for errors
(and sets errno). */
int mprotect __P ((__caddr_t __addr, size_t __len, int __prot));
/* Synchronize the region starting at ADDR and extending LEN bytes with the
file it maps. Filesystem operations on a file being mapped are
unpredictable before this is done. */
int msync __P ((__caddr_t __addr, size_t __len));
/* Advise the system about particular usage patterns the program follows
for the region starting at ADDR and extending LEN bytes. */
int madvise __P ((__caddr_t __addr, size_t __len, int __advice));
__END_DECLS
#endif /* sys/mman.h */
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