1 .\" Copyright (c) 1991, 1993
2 .\" The Regents of the University of California. All rights reserved.
4 .\" Redistribution and use in source and binary forms, with or without
5 .\" modification, are permitted provided that the following conditions
7 .\" 1. Redistributions of source code must retain the above copyright
8 .\" notice, this list of conditions and the following disclaimer.
9 .\" 2. Redistributions in binary form must reproduce the above copyright
10 .\" notice, this list of conditions and the following disclaimer in the
11 .\" documentation and/or other materials provided with the distribution.
12 .\" 3. Neither the name of the University nor the names of its contributors
13 .\" may be used to endorse or promote products derived from this software
14 .\" without specific prior written permission.
16 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
17 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
20 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 .\" @(#)msync.2 8.2 (Berkeley) 6/21/94
29 .\" $FreeBSD: src/lib/libc/sys/msync.2,v 1.16.2.5 2001/12/14 18:34:01 ru Exp $
30 .\" $DragonFly: src/lib/libc/sys/msync.2,v 1.2 2003/06/17 04:26:47 dillon Exp $
37 .Nd synchronize a mapped region
44 .Fn msync "void *addr" "size_t len" "int flags"
49 writes any modified pages back to the filesystem and updates
50 the file modification time.
53 is 0, all modified pages within the region containing
58 is non-zero, only those pages containing
62 succeeding locations will be examined.
65 argument may be specified as follows:
67 MS_ASYNC Return immediately
68 MS_SYNC Perform synchronous writes
69 MS_INVALIDATE Invalidate all cached data
79 is not a multiple of the hardware page size.
82 is too large or negative.
85 was both MS_ASYNC and MS_INVALIDATE.
86 Only one of these flags is allowed.
88 An I/O error occurred while writing to the file system.
98 function first appeared in