reboot - reboot system or halt processor
Reboot reboots the system, and is invoked automatically in the event of unrecoverable sys-
tem 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 (e.g. 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 per-
The bits of howto are:
the processor is simply halted; no reboot takes place. RB_HALT should be used with
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(0,0)vmunix"
Normally, the reboot procedure involves an automatic disk consistency check and
then multi-user operations. RB_SINGLE prevents the consistency check, rather sim-
ply booting the system with a single-user shell on the console. RB_SINGLE is
interpreted by the init(8) program in the newly booted system. This switch is not
available from the system call interface.
Only the super-user may reboot a machine.
If successful, this call never returns. Otherwise, a -1 is returned and an error is
returned in the global variable errno.
[EPERM] The caller is not the super-user.
crash(8), halt(8), init(8), reboot(8)
The notion of ``console medium'', among other things, is specific to the VAX.
4th Berkeley Distribution May 9, 1985 REBOOT(2)