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88 lines
2.4 KiB
Groff
88 lines
2.4 KiB
Groff
.\" -*- nroff -*-
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.\"
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.\" Copyright (c) 2000 Jonathan M. Bresler
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.\"
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.\" All rights reserved.
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.\"
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.\" This program is free software.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd January 14, 2000
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.Os
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.Dt KASSERT 9
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.Sh NAME
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.Nm KASSERT
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.Nd kernel expression verification macro
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.Sh SYNOPSIS
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.Cd "options INVARIANTS"
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.Pp
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.In sys/param.h
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.In sys/systm.h
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.Fn KASSERT expression msg
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.Sh DESCRIPTION
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In a kernel compiled with
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.Cd "options INVARIANTS" ,
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the
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.Fn KASSERT
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macro tests the given
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.Fa expression
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and if it is false,
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calls the
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.Xr panic 9
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function, terminating the running system.
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.Pp
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In a kernel that does not have
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.Cd "options INVARIANTS" ,
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the
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.Fn KASSERT
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macro is defined to be a no-op.
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The
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second argument is a
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.Xr printf 9
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format string and its arguments,
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enclosed in parentheses.
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.Sh EXAMPLES
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The kernel function
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.Fn vput
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must not be called with a
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.Dv NULL
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pointer.
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.Bd -literal -offset indent
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void
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vput(vp)
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struct vnode *vp;
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{
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struct proc *p = curproc;
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KASSERT(vp != NULL, ("vput: null vp"));
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...
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}
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.Ed
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.Sh SEE ALSO
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.Xr config 8 ,
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.Xr panic 9
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.Sh AUTHORS
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This manual page was written by
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.An Jonathan M. Bresler
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.Aq jmb@FreeBSD.org .
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