.\" Copyright (c) 1991, 1993 .\" The Regents of the University of California. All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. All advertising materials mentioning features or use of this software .\" must display the following acknowledgement: .\" This product includes software developed by the University of .\" California, Berkeley and its contributors. .\" 4. Neither the name of the University nor the names of its contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" @(#)msync.2 8.2 (Berkeley) 6/21/94 .\" $FreeBSD: src/lib/libc/sys/msync.2,v 1.17 2000/04/21 09:41:53 phantom Exp $ .\" .Dd June 21, 1994 .Dt MSYNC 2 .Os .Sh NAME .Nm msync .Nd synchronize a mapped region .Sh LIBRARY .Lb libc .Sh SYNOPSIS .Fd #include <sys/types.h> .Fd #include <sys/mman.h> .Ft int .Fn msync "void *addr" "size_t len" "int flags" .Sh DESCRIPTION The .Fn msync system call writes any modified pages back to the filesystem and updates the file modification time. If .Fa len is 0, all modified pages within the region containing .Fa addr will be flushed; if .Fa len is non-zero, only those pages containing .Fa addr and .Fa len-1 succeeding locations will be examined. The .Fa flags argument may be specified as follows: .Bd -literal MS_ASYNC Return immediately MS_SYNC Perform synchronous writes MS_INVALIDATE Invalidate all cached data .Ed .Sh RETURN VALUES If any errors occur, -1 is returned and errno is set to indicate the error. Otherwise, a 0 value is returned. .Sh ERRORS .Fn msync will fail if: .Bl -tag -width Er .It Bq Er EINVAL .Fa addr is not a multiple of the hardware page size. .It Bq Er EINVAL .Fa len is too large or negative. .It Bq Er EINVAL .Fa flags was both MS_ASYNC and MS_INVALIDATE. Only one of these flags is allowed. .It Bq Er EIO An I/O error occurred while writing to the file system. .Sh SEE ALSO .Xr madvise 2 , .Xr mincore 2 , .Xr mprotect 2 , .Xr munmap 2 .Sh HISTORY The .Fn msync function first appeared in .Bx 4.4 .