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-.\" Copyright (c) 1991, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
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-.\" modification, are permitted provided that the following conditions
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-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
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-.\"    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:
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-.\"	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
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-.\"	@(#)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 .