NAME

reboot − reboot system or halt processor

SYNOPSIS

#include <sys/reboot.h>

reboot(howto)
int howto;

DESCRIPTION

Reboot reboots the system, and is invoked automatically in the event of unrecoverable system failures.  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 (for example, RB_AUTOBOOT) is given, the system is 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 then normally performed. 

The bits of howto are:

RB_HALT
the processor is simply halted; no reboot takes place. RB_HALT should be used with caution.

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 “xx(40,0,0)vmunix” without asking, where ‘xx’ is the abbreviation for the specific controller for the default device.

RB_SINGLE
Normally, the reboot procedure involves an automatic disk consistency check and then multi-user operations.  RB_SINGLE stops the consistency check, and simply boots the system with a single-user shell on the console. RB_SINGLE is interpreted by the init(8) program in the newly booted system. RB_SINGLE is not available from the system call interface.

SEE ALSO

crash(8), halt(8), init(8), reboot(8)

Sun System Release 0.3  —  4 April 1983