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+.\" 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. 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.
+.\"
+.\"     @(#)sync.2	8.1 (Berkeley) 6/4/93
+.\" %FreeBSD: src/lib/libc/sys/sync.2,v 1.14 2002/12/18 09:22:31 ru Exp %
+.\"
+.\" $FreeBSD$
+.Dd June 4, 1993
+.Dt SYNC 2
+.Os
+.Sh 名称
+.Nm sync
+.Nd ファイルシステムの更新をスケジュールする
+.Sh ライブラリ
+.Lb libc
+.Sh 書式
+.In unistd.h
+.Ft void
+.Fn sync void
+.Sh 解説
+.Fn sync
+システムコールは、ブロックバッファキャッシュのダーティな (更新された) バッファ
+をディスクに強制的に書き出します。
+カーネルはこの情報をメモリ上に溜めこみ、システムが要求する
+ディスク I/O 転送の数を減らします。
+システムがクラッシュするとキャッシュの情報が失われてしまうため、
+ユーザプロセス
+.Xr syncer 4
+は
+.Fn sync
+システムコールを頻繁に呼び出します (約 30 秒ごと)。
+.Pp
+それぞれのファイル記述子属性の同期を取るには、関数
+.Xr fsync 2
+システムコールを使用します。
+.Sh 関連項目
+.Xr fsync 2 ,
+.Xr syncer 4 ,
+.Xr sync 8
+.Sh バグ
+.Fn sync
+システムコールは、バッファが完全にフラッシュされる前に戻ることがあります。
+.Sh 歴史
+.Fn sync
+関数は、
+.At v6
+で登場しました。