1.\" 2.\" Copyright (c) 2004 The DragonFly Project. All rights reserved. 3.\" 4.\" This code is derived from software contributed to The DragonFly Project 5.\" by Hiten Pandya <hmp@backplane.com>. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 2. Redistributions in binary form must reproduce the above copyright 14.\" notice, this list of conditions and the following disclaimer in 15.\" the documentation and/or other materials provided with the 16.\" distribution. 17.\" 3. Neither the name of The DragonFly Project nor the names of its 18.\" contributors may be used to endorse or promote products derived 19.\" from this software without specific, prior written permission. 20.\" 21.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23.\" LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24.\" FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25.\" COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26.\" INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29.\" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31.\" OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" Copyright (c) 2000 Jonathan M. Bresler 35.\" 36.\" All rights reserved. 37.\" 38.\" This program is free software. 39.\" 40.\" Redistribution and use in source and binary forms, with or without 41.\" modification, are permitted provided that the following conditions 42.\" are met: 43.\" 1. Redistributions of source code must retain the above copyright 44.\" notice, this list of conditions and the following disclaimer. 45.\" 2. Redistributions in binary form must reproduce the above copyright 46.\" notice, this list of conditions and the following disclaimer in the 47.\" documentation and/or other materials provided with the distribution. 48.\" 49.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR 50.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 51.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 52.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, 53.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 54.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 55.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 56.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 57.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 58.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 59.\" 60.\" $FreeBSD: src/share/man/man9/KASSERT.9,v 1.1.2.4 2001/07/21 09:16:54 schweikh Exp $ 61.\" 62.Dd May 10, 2004 63.Dt KASSERT 9 64.Os 65.Sh NAME 66.Nm KASSERT , 67.Nm KKASSERT 68.Nd kernel expression verification macros 69.Sh SYNOPSIS 70.Cd options INVARIANTS 71.Fn KASSERT expression "const char *msg" 72.Fn KKASSERT expression 73.Sh DESCRIPTION 74The macros described in this manual page are no-op unless the kernel 75is compiled with 76.Cd "options INVARIANTS" . 77.Pp 78The 79.Fn KASSERT 80macro tests the given 81.Ar expression 82and if it is false, 83the 84.Xr panic 9 85function is called to display 86.Fa msg 87and terminate the running system. 88.Pp 89The 90.Fn KKASSERT 91macro is similar to 92.Fn KASSERT , 93except it does not require a description message but instead 94displays 95.Fa expression 96and terminates the running system. 97.Sh EXAMPLES 98The kernel function 99.Fn vput 100must not be called with a NULL pointer. 101.Bd -literal -offset indent 102void 103vput(struct vnode *vp) 104{ 105 struct thread *td = curthread; 106 107 KASSERT(vp != NULL, ("vput: null vp")); 108 ... 109} 110.Ed 111.Sh SEE ALSO 112.Xr panic 9 113.Sh AUTHORS 114.An -nosplit 115This manual page was written by 116.An Jonathan M. Bresler Aq Mt jmb@FreeBSD.org 117and modified for 118.Dx 119by 120.An Hiten Pandya Aq Mt hmp@dragonflybsd.org . 121