a06e2ab395
import/switch of: init, getty, reboot, halt, shutdown, wall, last changes: . change reboot() call to netbsd prototype and args . allows pristine <utmp.h> . use clean <sys/reboot.h> instead of <minix/reboot.h> . implement TIOCSCTTY for use by getty so getty can get controlling terminal from init's child(ren) . allow NULL envp for exec Change-Id: I5ca02cb4230857140c08794bbfeba7df982c58a3
168 lines
4.8 KiB
Groff
168 lines
4.8 KiB
Groff
.\" $NetBSD: reboot.8,v 1.29 2011/02/16 19:32:26 wiz Exp $
|
|
.\"
|
|
.\" Copyright (c) 1990, 1991, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)reboot.8 8.1 (Berkeley) 6/9/93
|
|
.\"
|
|
.Dd February 16, 2011
|
|
.Dt REBOOT 8
|
|
.Os
|
|
.Sh NAME
|
|
.Nm reboot ,
|
|
.Nm poweroff ,
|
|
.Nm halt
|
|
.Nd restarting, powering down and stopping the system
|
|
.Sh SYNOPSIS
|
|
.Nm halt
|
|
.Op Fl dlnpqvxz
|
|
.Nm poweroff
|
|
.Op Fl dlnqvxz
|
|
.Nm
|
|
.Op Fl dlnqvxz
|
|
.Op Ar arg ...
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm poweroff ,
|
|
.Nm halt
|
|
and
|
|
.Nm
|
|
utilities flush the file system cache to disk, send all running processes
|
|
a
|
|
.Dv SIGTERM ,
|
|
wait for up to 30 seconds for them to die, send a
|
|
.Dv SIGKILL
|
|
to the survivors and, respectively, power down, halt or restart the system.
|
|
The action is logged, including entering a shutdown record into the login
|
|
accounting file and sending a message via
|
|
.Xr syslog 3 .
|
|
.Pp
|
|
The options are as follows:
|
|
.Bl -tag -width Ds
|
|
.It Fl d
|
|
Create a dump before halting or restarting.
|
|
This option is useful for debugging system dump procedures or
|
|
capturing the state of a corrupted or misbehaving system.
|
|
.It Fl l
|
|
Suppress sending a message via
|
|
.Xr syslog 3
|
|
before halting or restarting.
|
|
.It Fl n
|
|
Do not flush the file system cache.
|
|
This option should be used with extreme caution.
|
|
It can be used if a disk or a processor is on fire.
|
|
.It Fl p
|
|
Attempt to powerdown the system.
|
|
If the powerdown fails, or the system does not support
|
|
software powerdown, the system will halt.
|
|
This option is only valid for
|
|
.Nm halt .
|
|
.It Fl v
|
|
To enable verbose messages on the console, pass the
|
|
.Xr boothowto 9
|
|
flag
|
|
.Dv AB_VERBOSE
|
|
to
|
|
.Xr reboot 2 .
|
|
.It Fl x
|
|
To enable debugging messages on the console, pass the
|
|
.Xr boothowto 9
|
|
flag
|
|
.Dv AB_DEBUG
|
|
to
|
|
.Xr reboot 2 .
|
|
.It Fl z
|
|
To silence some shutdown messages on the console, pass the
|
|
.Xr boothowto 9
|
|
flag
|
|
.Dv AB_SILENT
|
|
to
|
|
.Xr reboot 2 .
|
|
.It Fl q
|
|
Do not give processes a chance to shut down before halting or restarting.
|
|
This option should not normally be used.
|
|
.El
|
|
.Pp
|
|
If there are any arguments passed to
|
|
.Nm reboot
|
|
they are concatenated with spaces and passed as
|
|
.Fa bootstr
|
|
to the
|
|
.Xr reboot 2
|
|
system call.
|
|
The string is passed to the firmware on platforms that support it.
|
|
.Pp
|
|
Normally, the
|
|
.Xr shutdown 8
|
|
utility is used when the system needs to be halted or restarted, giving
|
|
users advance warning of their impending doom.
|
|
.Sh SEE ALSO
|
|
.Xr reboot 2 ,
|
|
.Xr syslog 3 ,
|
|
.Xr utmp 5 ,
|
|
.Xr boot 8 ,
|
|
.Xr init 8 ,
|
|
.Xr rescue 8 ,
|
|
.Xr shutdown 8 ,
|
|
.Xr sync 8
|
|
.Sh HISTORY
|
|
A
|
|
.Nm
|
|
command appeared in
|
|
.At v6 .
|
|
.Pp
|
|
The
|
|
.Nm poweroff
|
|
command first appeared in
|
|
.Nx 1.5 .
|
|
.Sh CAVEATS
|
|
Once the command has begun its work, stopping it before it completes
|
|
will probably result in a system so crippled it must be
|
|
physically reset.
|
|
To prevent premature termination, the command
|
|
blocks many signals early in its execution.
|
|
However, nothing can defend against deliberate attempts to evade this.
|
|
.Pp
|
|
This command will stop the system without running any
|
|
.Xr shutdown 8
|
|
scripts.
|
|
Amongst other things, this means that swapping will not be
|
|
disabled so that
|
|
.Xr raid 4
|
|
can shutdown cleanly.
|
|
You should normally use
|
|
.Xr shutdown 8
|
|
unless you are running in single user mode.
|
|
.Sh BUGS
|
|
The single user shell will ignore the
|
|
.Dv SIGTERM
|
|
signal.
|
|
To avoid waiting for the timeout when
|
|
rebooting or halting from the single user shell, you have to
|
|
.Ic exec reboot
|
|
or
|
|
.Ic exec halt .
|