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+.\"	$OpenBSD: sync.2,v 1.17 2022/03/31 17:27:16 naddy Exp $
+.\"	$NetBSD: sync.2,v 1.4 1995/02/27 12:38:41 cgd Exp $
+.\"
+.\" Copyright (c) 1980, 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.
+.\"
+.\"     @(#)sync.2	8.1 (Berkeley) 6/4/93
+.\"
+.Dd $Mdocdate: March 31 2022 $
+.Dt SYNC 2
+.Os
+.Sh NAME
+.Nm sync
+.Nd synchronize disk block in-core status with that on disk
+.Sh SYNOPSIS
+.In unistd.h
+.Ft void
+.Fn sync void
+.Sh DESCRIPTION
+The
+.Fn sync
+function forces a write of dirty (modified) buffers
+in the block buffer cache out to disk.
+The kernel keeps this information in core to reduce
+the number of disk I/O transfers required by the system.
+As information in the cache is lost after a system crash, a
+.Fn sync
+call is issued frequently by the in-kernel process update
+(about every 30 seconds).
+.Pp
+The function
+.Xr fsync 2
+may be used to synchronize individual file descriptor attributes.
+.Sh SEE ALSO
+.Xr fsync 2 ,
+.Xr sync 8
+.Sh STANDARDS
+The
+.Fn sync
+function conforms to
+.St -p1003.1-2008 .
+.Sh HISTORY
+A
+.Fn sync
+function appeared in
+.At v2 .
+.Sh BUGS
+.Fn sync
+may return before the buffers are completely flushed.