1.\" $NetBSD: panic.9,v 1.2 1996/10/09 17:20:04 explorer Exp $ 2.\" 3.\" Copyright (c) 1996 Michael Graff. 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by Michael Graff 17.\" for the NetBSD Project. 18.\" 3. The name of the author may not be used to endorse or promote products 19.\" derived from this software without specific prior written permission 20.\" 21.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31.\" 32.\" $FreeBSD$ 33.\" 34.Dd April 23, 2015 35.Dt PANIC 9 36.Os 37.Sh NAME 38.Nm panic 39.Nd bring down system on fatal error 40.Sh SYNOPSIS 41.In sys/types.h 42.In sys/systm.h 43.Ft void 44.Fn panic "const char *fmt" ... 45.Ft void 46.Fn vpanic "const char *fmt" "va_list ap" 47.Sh DESCRIPTION 48The 49.Fn panic 50and 51.Fn vpanic 52functions terminate the running system. 53The message 54.Fa fmt 55is a 56.Xr printf 3 57style format string. 58The message is printed to the console and the location 59.Fa panicstr 60is set to the address of the message text for retrieval from the OS 61core dump. 62.Pp 63If the kernel debugger is installed control is passed to it, otherwise 64an attempt to save a core dump of the OS to a configured dump device 65is made. 66.Pp 67If 68.Fn panic 69is called twice (from the disk sync routines, for example) the system is 70rebooted without syncing the disks. 71.Sh RETURN VALUES 72The 73.Fn panic 74function does not return. 75