88 lines
2.4 KiB
Groff
88 lines
2.4 KiB
Groff
.\" -*- 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.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd January 14, 2000
|
|
.Os
|
|
.Dt KASSERT 9
|
|
.Sh NAME
|
|
.Nm KASSERT
|
|
.Nd kernel expression verification macro
|
|
.Sh SYNOPSIS
|
|
.Cd "options INVARIANTS"
|
|
.Pp
|
|
.In sys/param.h
|
|
.In sys/systm.h
|
|
.Fn KASSERT expression msg
|
|
.Sh DESCRIPTION
|
|
In a kernel compiled with
|
|
.Cd "options INVARIANTS" ,
|
|
the
|
|
.Fn KASSERT
|
|
macro tests the given
|
|
.Fa expression
|
|
and if it is false,
|
|
calls the
|
|
.Xr panic 9
|
|
function, terminating the running system.
|
|
.Pp
|
|
In a kernel that does not have
|
|
.Cd "options INVARIANTS" ,
|
|
the
|
|
.Fn KASSERT
|
|
macro is defined to be a no-op.
|
|
The
|
|
second argument is a
|
|
.Xr printf 9
|
|
format string and its arguments,
|
|
enclosed in parentheses.
|
|
.Sh EXAMPLES
|
|
The kernel function
|
|
.Fn vput
|
|
must not be called with a
|
|
.Dv NULL
|
|
pointer.
|
|
.Bd -literal -offset indent
|
|
void
|
|
vput(vp)
|
|
struct vnode *vp;
|
|
{
|
|
struct proc *p = curproc;
|
|
KASSERT(vp != NULL, ("vput: null vp"));
|
|
...
|
|
}
|
|
.Ed
|
|
.Sh SEE ALSO
|
|
.Xr config 8 ,
|
|
.Xr panic 9
|
|
.Sh AUTHORS
|
|
This manual page was written by
|
|
.An Jonathan M. Bresler
|
|
.Aq jmb@FreeBSD.org .
|