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+.\" -*- nroff -*-
+.\"
+.\" Copyright (c) 2000 Jonathan M. Bresler
+.\"
+.\" All rights reserved.
+.\"
+.\" This program is free software.
+.\"
+.\" 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``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 DEVELOPERS 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.
+.\"
+.\" %FreeBSD: src/share/man/man9/KASSERT.9,v 1.12 2003/05/16 19:54:20 hmp Exp %
+.\"
+.\" $FreeBSD$
+.Dd January 14, 2000
+.Os
+.Dt KASSERT 9
+.Sh 名称
+.Nm KASSERT
+.Nd カーネル数式検証マクロ
+.Sh 書式
+.Cd "options INVARIANTS"
+.Pp
+.In sys/param.h
+.In sys/systm.h
+.Fn KASSERT expression msg
+.Sh 解説
+.Cd "options INVARIANTS"
+オプション付きでコンパイルされたカーネル内では、
+.Fn KASSERT
+マクロは与えられた数式
+.Fa expression
+をテストし、それが偽である場合には
+.Xr panic 9
+関数を呼び出し、稼働中のシステムを停止させます。
+.Pp
+.Cd "options INVARIANTS"
+オプションの無いカーネル内では、
+.Fn KASSERT
+マクロは何もしない様に定義されます。
+第 2 引数は、
+.Xr printf 9
+フォーマット文字列とその引数を括弧に括ったものです。
+.Sh 使用例
+カーネル関数
+.Fn vput
+は、
+.Dv NULL
+ポインタを引数として呼び出されてはなりません。
+.Bd -literal -offset indent
+void
+vput(vp)
+        struct vnode *vp;
+{
+	struct proc *p = curproc;
+	KASSERT(vp != NULL, ("vput: null vp"));
+	...
+}
+.Ed
+.Sh 関連項目
+.Xr config 8 ,
+.Xr panic 9
+.Sh 作者
+このマニュアルページは
+.An Jonathan M. Bresler
+.Aq jmb@FreeBSD.org
+が書きました。