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Manual page for REBOOT(2)

reboot - reboot system or halt processor

SYNOPSIS

#include <sys/reboot.h>

reboot(howto, [ bootargs ] )
int howto;
char *bootargs;

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 instance 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 /vmunix without asking.
RB_SINGLE: Normally, the reboot procedure involves an automatic disk consistency check and then multi-user operations. RB_SINGLE prevents the consistency check, rather simply 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.
RB_DUMP: A system core dump is performed before rebooting.
RB_STRING: The optional argument bootargs is passed to the bootstrap program. See boot.8s for details. This option overrides RB_SINGLE but the same effect can be achieved by including -s as an option in bootargs.

Only the super-user may reboot() a machine.

RETURN VALUES

On success, reboot() does not return. On failure, it returns -1 and sets errno to indicate the error.

ERRORS

EPERM: The caller is not the super-user.

FILES