glibc/sysdeps/unix/sysv/linux/sys/mman.h

/* Definitions for BSD-style memory management.  Linux version.
Copyright (C) 1994, 1995, 1996 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.  */

#ifndef	_SYS_MMAN_H

#define	_SYS_MMAN_H	1
#include <features.h>

#include <gnu/types.h>
#define __need_size_t
#include <stddef.h>

#include <sys/cdefs.h>

/* Get the bit values from the kernel header file.  */
#include <linux/mman.h>

#ifndef MAP_ANON
#define MAP_ANON	MAP_ANONYMOUS
#endif
#ifndef MAP_FILE
#define MAP_FILE	0
#endif

__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, int flags));

/* 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));

/* Cause all currently mapped pages of the process to be memory resident
   until unlocked by a call to the `munlockall', until the process exits,
   or until the process calls `execve'.  */
int mlockall __P ((int __flags));

/* All currently mapped pages of the process' address space become
   unlocked.  */
int munlockall __P ((void));

/* Guarantee all whole pages mapped by the range [ADDR,ADDR+LEN) to
   be memory resident.  */
int mlock __P ((__caddr_t __addr, size_t __len));

/* Unlock whole pages previously mapped by the range [ADDR,ADDR+LEN).  */
int munlock __P ((__caddr_t __addr, size_t __len));

/* Remap pages mapped by the range [ADDR,ADDR+OLD_LEN) to new length
   NEW_LEN.  If MAY_MOVE is MREMAP_MAXMOVE the returned address may
   differ from ADDR.  */
__caddr_t __mremap __P ((__caddr_t __addr, size_t __old_len, size_t __new_len,
			 int __may_move));
__caddr_t mremap __P ((__caddr_t __addr, size_t __old_len, size_t __new_len,
		       int __may_move));

__END_DECLS


#endif	/* sys/mman.h */