.\" Copyright (c) 1980, 1991 The Regents of the University of California.
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" 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. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 4. 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
.\" @(#)reboot.2 6.5 (Berkeley) 3/10/91
.Nd reboot system or halt processor
.Fd #include <sys/reboot.h>
Only the super-user may reboot a machine on demand.
However, a reboot is invoked
automatically in the event of unrecoverable system failures.
is a mask of options; the system call interface allows the following
options, defined in the include file
to the new kernel or the new bootstrap and init programs.
.Bl -tag -width RB_INITNAMEA
The default, causing the system to reboot in its usual fashion.
Interpreted by the bootstrap program itself, causing it to
prompt on the console as to what file should be booted.
Normally, the system is booted from the file
.Dq Em xx Ns No (0,0)vmunix ,
is the default disk name,
without prompting for the file name.
Use the compiled in root device.
Normally, the system uses the device from which it was booted
as the root device if possible.
(The default behavior is dependent on the ability of the bootstrap program
to determine the drive from which it was loaded, which is not possible
Dump kernel memory before rebooting; see
the processor is simply halted; no reboot takes place.
This option should be used with caution.
An option allowing the specification of an init program (see
to be run when the system reboots.
This switch is not currently available.
Load the symbol table and enable a built-in debugger in the system.
This option will have no useful function if the kernel is not configured
Several other options have different meaning if combined
with this option, although their use may not be possible
Normally, the disks are sync'd (see
before the processor is halted or rebooted.
This option may be useful if file system changes have been made manually
or if the processor is on fire.
Initially mount the root file system read-only.
This is currently the default, and this option has been deprecated.
Normally, the reboot procedure involves an automatic disk consistency
check and then multi-user operations.
prevents this, booting the system with a single-user shell
is actually interpreted by the
program in the newly booted system.
When no options are given (i.e.,
rebooted from file ``vmunix'' in the root file system of unit 0
of a disk chosen in a processor specific way.
An automatic consistency check of the disks is normally performed
If successful, this call never returns.
Otherwise, a -1 is returned and an error is returned in the global
The caller is not the super-user.
The HP300 implementation supports neither
function call appeared in