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.\"	$NetBSD: boot.9,v 1.2 1996/09/24 07:01:26 ghudson Exp $
.\"
.\" Copyright (c) 1997
.\" 	Mike Pritchard.  All rights reserved.
.\"
.\" Copyright (c) 1994 Christopher G. Demetriou
.\" All rights reserved.
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.\" modification, are permitted provided that the following conditions
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.\"    documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"      This product includes software developed by Christopher G. Demetriou
.\"      for the NetBSD Project.
.\" 3. The name of the author may not be used to endorse or promote products
.\"    derived from this software without specific prior written permission
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.\" $FreeBSD: release/9.1.0/share/man/man9/boot.9 131530 2004-07-03 18:29:24Z ru $
.\"
.Dd February 14, 1997
.Dt BOOT 9
.Os
.Sh NAME
.Nm boot
.Nd halt or reboot the system
.Sh SYNOPSIS
.In sys/types.h
.In sys/systm.h
.In sys/reboot.h
.Ft void
.Fn boot "int howto"
.Sh DESCRIPTION
The
.Fn boot
function handles final system shutdown, and either halts or reboots
the system.
The exact action to be taken is determined by the flags passed in
.Fa howto
and by whether or not the system has finished autoconfiguration.
.Pp
If the system has finished autoconfiguration,
.Fn boot
does the following:
.Bl -enum -offset indent
.It
If this is the first invocation of
.Fn boot
and the
.Dv RB_NOSYNC
flag is not set in
.Fa howto ,
syncs and unmounts the system disks by calling
.Xr vfs_unmountall 9 .
.It
Disables interrupts.
.It
If rebooting after a crash (i.e., if
.Dv RB_DUMP
is set in
.Fa howto ,
but
.Dv RB_HALT
is not), saves a system crash dump.
.It
Runs any shutdown hooks previously registered.
.It
Prints a message indicating that the system is about to be halted
or rebooted.
.It
If
.Dv RB_HALT
is set in
.Fa howto ,
halts the system.
Otherwise, reboots the system.
.El
.Pp
If the system has not finished autoconfiguration,
.Fn boot
runs any shutdown hooks previously registered,
prints a message, and halts the system.
.Sh SEE ALSO
.Xr vfs_unmountall 9