mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-27 04:41:02 +08:00
100 lines
4.0 KiB
C
100 lines
4.0 KiB
C
/* Definitions for BSD-style memory management. Ultrix 4 version.
|
|
Copyright (C) 1994 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 0x01 /* Pages can be read. */
|
|
#define PROT_WRITE 0x02 /* Pages can be written. */
|
|
#define PROT_EXEC 0x04 /* Pages can be executed. */
|
|
|
|
|
|
/* Sharing types (must choose one and only one of these). */
|
|
#define MAP_SHARED 0x01 /* Share changes. */
|
|
#define MAP_PRIVATE 0x02 /* Changes private; copy pages on write. */
|
|
#define MAP_TYPE 0x0f /* Mask for sharing type. */
|
|
|
|
/* Other flags. */
|
|
#define MAP_FIXED 0x10 /* Map address must be exactly as requested. */
|
|
|
|
/* 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));
|
|
|
|
/* 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));
|
|
|
|
/* 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));
|
|
|
|
/* Ultrix 4 does not implement `msync' or `madvise'. */
|
|
|
|
/* 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 */
|