1.\" $OpenBSD: panic.9,v 1.7 2007/05/31 19:20:00 jmc Exp $ 2.\" $NetBSD: panic.9,v 1.2 1996/10/09 17:20:04 explorer Exp $ 3.\" 4.\" Copyright (c) 1996 Michael Graff. 5.\" All rights reserved. 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.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. All advertising materials mentioning features or use of this software 16.\" must display the following acknowledgement: 17.\" This product includes software developed by Michael Graff 18.\" for the NetBSD Project. 19.\" 3. The name of the author may not be used to endorse or promote products 20.\" derived from this software without specific prior written permission 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32.\" 33.Dd $Mdocdate: May 31 2007 $ 34.Dt PANIC 9 35.Os 36.Sh NAME 37.Nm panic 38.Nd Bring down system on fatal error 39.Sh SYNOPSIS 40.Fd #include <sys/types.h> 41.Fd #include <sys/systm.h> 42.Ft void 43.Fn panic "const char *fmt, ..." 44.Sh DESCRIPTION 45The 46.Fn panic 47function makes the 48.Ox 49system terminate. 50The message 51.Fa fmt 52is a 53.Xr printf 9 54style format string. 55The message is printed to the console and the location 56pointed to by the global char pointer 57.Fa panicstr 58is set to the address of the message text for retrieval from the OS 59core dump. 60.Pp 61If the kernel debugger is installed, control is passed to it. 62Otherwise, an attempt is made to save a core dump of the OS to a configured 63dump device. 64.Pp 65If 66.Fn panic 67is called twice (from the disk sync routines, for example) the system is 68rebooted without syncing the disks. 69.Sh RETURN VALUES 70The 71.Fn panic 72function does not return. 73.Sh SEE ALSO 74.Xr printf 3 , 75.Xr boot 9 , 76.Xr printf 9 77