REBOOT(2)	    UNIX Programmer's Manual		REBOOT(2)

     reboot - reboot system or halt processor

     #include <sys/reboot.h>

     int howto;

     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 (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 performed.

     The bits of howto are:

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

	  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"
	  without asking.

	  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 con-
	  sole.  RB_SINGLE is interpreted by the init(8) program
	  in the newly booted system.  This switch is not avail-
	  able 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

     [EPERM]	    The caller is not the super-user.

Printed 11/26/99	   May 9, 1985				1

REBOOT(2)	    UNIX Programmer's Manual		REBOOT(2)

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

     The notion of ``console medium'', among other things, is
     specific to the VAX.

Printed 11/26/99	   May 9, 1985				2

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