1.\" $NetBSD: boot.9,v 1.2 1996/09/24 07:01:26 ghudson Exp $ 2.\" 3.\" Copyright (c) 1997 4.\" Mike Pritchard. All rights reserved. 5.\" 6.\" Copyright (c) 1994 Christopher G. Demetriou 7.\" All rights reserved. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 3. All advertising materials mentioning features or use of this software 18.\" must display the following acknowledgement: 19.\" This product includes software developed by Christopher G. Demetriou 20.\" for the NetBSD Project. 21.\" 3. The name of the author may not be used to endorse or promote products 22.\" derived from this software without specific prior written permission 23.\" 24.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 25.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 28.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 29.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 30.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 31.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 32.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 33.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34.\" 35.\" $FreeBSD: src/share/man/man9/boot.9,v 1.4.2.2 2001/12/17 11:30:18 ru Exp $ 36.\" $DragonFly: src/share/man/man9/boot.9,v 1.3 2007/04/07 20:19:52 swildner Exp $ 37.\" 38.Dd April 7, 2007 39.Dt BOOT 9 40.Os 41.Sh NAME 42.Nm boot 43.Nd halt or reboot the system 44.Sh SYNOPSIS 45.In sys/types.h 46.In sys/systm.h 47.In sys/reboot.h 48.Ft void 49.Fn boot "int howto" 50.Sh DESCRIPTION 51The 52.Fn boot 53function handles final system shutdown, and either halts or reboots 54the system. The exact action to be taken is determined by the 55flags passed in 56.Fa howto 57and by whether or not the system has finished autoconfiguration. 58.Pp 59If the system has finished autoconfiguration, 60.Fn boot 61does the following: 62.Bl -enum -offset indent 63.It 64If this is the first invocation of 65.Fn boot 66and the 67.Dv RB_NOSYNC 68flag is not set in 69.Fa howto , 70syncs and unmounts the system disks by calling 71.Xr vfs_unmountall 9 . 72.It 73Disables interrupts. 74.It 75If rebooting after a crash (i.e. if 76.Dv RB_DUMP 77is set in 78.Fa howto , 79but 80.Dv RB_HALT 81is not), saves a system crash dump. 82.It 83Runs any shutdown hooks previously registered with 84.Xr EVENTHANDLER_REGISTER 9 . 85.It 86Prints a message indicating that the system is about to be halted 87or rebooted. 88.It 89If 90.Dv RB_HALT 91is set in 92.Fa howto , 93halts the system. 94Otherwise, reboots the system. 95.El 96.Pp 97If the system has not finished autoconfiguration, 98.Fn boot 99runs any shutdown hooks previously registered with 100.Xr EVENTHANDLER_REGISTER 9 , 101prints a message, and halts the system. 102.Sh SEE ALSO 103.Xr EVENTHANDLER 9 , 104.Xr vfs_unmountall 9 105