4.1cBSD/usr/man/man2/reboot.2

.TH REBOOT 2 2/13/83
.SH NAME
reboot \- reboot system or halt processor
.SH SYNOPSIS
.nf
.B #include <sys/reboot.h>
.PP
.B reboot(howto)
.B int howto;
.fi
.SH DESCRIPTION
.I Reboot
is used to cause a system reboot, and is invoked automatically
in the event of unrecoverable system failures.
.I Howto
is a mask of options passed to the bootstrap program.
The system call interface permits only RB_HALT or RB_AUTOBOOT
to be passed to the reboot program; the other flags
are used in scripts stored on the console storage media, or used
in manual bootstrap procedures.
When none of these options (e.g. RB_AUTOBOOT) is given, the system is rebooted
from file \*(lqvmunix\*(rq 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 then normally performed.
.PP
The bits of
.I howto
are:
.TP
RB_HALT
the processor is simply halted; no reboot takes place.
This should be used with caution.
.TP
RB_ASKNAME
Interpreted by the bootstrap program itself, causing it to
inquire as to what file should be booted.  Normally, the system is
booted from the file \*(lqxx(0,0)vmunix\*(rq without asking.
.TP
RB_SINGLE
Normally, the reboot procedure involves an automatic disk consistency
check and then multi-user operations.  This prevents the consistency
check, rather simply booting the system with a single-user shell on
the console.
This switch is interpreted by the
.IR init (8)
program in the newly booted system.
This switch is not available from the system call interface.
.SH "SEE ALSO"
crash(8), halt(8), init(8), reboot(8)
.SH BUGS