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+.\"	$NetBSD: msync.2,v 1.25 2014/05/09 17:25:11 njoly Exp $
+.\"
+.\" 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. 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
+.\"
+.Dd May 9, 2014
+.Dt MSYNC 2
+.Os
+.Sh NAME
+.Nm msync
+.Nd synchronize a mapped region
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/mman.h
+.Ft int
+.Fn msync "void *addr" "size_t len" "int flags"
+.Sh DESCRIPTION
+The
+.Fn msync
+system call writes all pages with shared modifications
+in the specified
+region of the process's address space back to permanent
+storage, and, if requested, invalidates cached data mapped
+in the region.
+If
+.Fa len
+is 0, all modified pages within the region containing
+.Fa addr
+will be flushed;
+if
+.Fa len
+is non-zero, only modified pages containing
+.Fa addr
+and
+.Fa len
+succeeding locations will be flushed.
+Any required synchronization of memory caches
+will also take place at this time.
+Filesystem operations on a file that is mapped for shared modifications
+are unpredictable except after an
+.Fn msync .
+.Pp
+The
+.Fa flags
+argument is formed by
+.Em or Ns 'ing
+the following values
+.Pp
+.Bl -column -offset indent -compact MS_INVALIDATE
+.It Dv MS_ASYNC Ta Perform asynchronous writes.
+.It Dv MS_SYNC Ta Perform synchronous writes.
+.It Dv MS_INVALIDATE Ta Invalidate cached data after writing.
+.El
+.Sh RETURN VALUES
+Upon successful completion,
+a value of 0 is returned.
+Otherwise, a value of \-1 is returned and
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+The following errors may be reported:
+.Bl -tag -width Er
+.It Bq Er EBUSY
+The
+.Dv MS_INVALIDATE
+flag was specified and a portion of the specified region
+was locked with
+.Xr mlock 2 .
+.It Bq Er EINVAL
+The specified
+.Fa flags
+argument was invalid.
+.It Bq Er EINVAL
+The
+.Fa addr
+parameter was not page aligned.
+.It Bq Er EINVAL
+The
+.Fa addr
+parameter did not specify an address part of a mapped region.
+.It Bq Er EIO
+An I/O error occurred while writing to the file system.
+.It Bq Er ENOMEM
+Addresses in the specified region are outside the range allowed
+for the address space of the process, or specify one or more pages
+which are unmapped.
+.El
+.Sh SEE ALSO
+.Xr mlock 2 ,
+.Xr mmap 2 ,
+.Xr munlock 2
+.Sh STANDARDS
+The
+.Fn msync
+function conforms to
+.St -p1003.1b-93
+.Sh HISTORY
+The
+.Fn msync
+function first appeared in
+.Bx 4.4 .
+It was modified to conform to
+.St -p1003.1b-93
+in
+.Nx 1.3 .