REBOOT man page on OpenBSD

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

NAME
     reboot - reboot system or halt processor

SYNOPSIS
     #include <unistd.h>
     #include <sys/reboot.h>

     int
     reboot(int howto);

DESCRIPTION
     reboot() reboots the system.  Only the superuser may reboot a machine on
     demand.  However, a reboot is invoked automatically in the event of
     unrecoverable system failures.

     howto is a mask of options; the system call interface allows the
     following options, defined in the include file <sys/reboot.h>, to be
     passed to the new kernel or the new bootstrap and init programs.

     RB_AUTOBOOT   The default, causing the system to reboot in its usual
		   fashion.

     RB_ASKNAME	   Interpreted by the bootstrap program itself, causing it to
		   prompt on the console as to what file should be booted.
		   Normally, the system is booted from the file
		   ``xx(0,0)bsd'', where xx is the default disk name, without
		   prompting for the file name.

     RB_DFLTROOT   Use the compiled in root device.  Normally, the system uses
		   the device from which it was booted as the root device if
		   possible.  (The default behavior is dependent on the
		   ability of the bootstrap program to determine the drive
		   from which it was loaded, which is not possible on all
		   systems.)

     RB_DUMP	   Dump kernel memory before rebooting; see savecore(8) for
		   more information.

     RB_HALT	   The processor is simply halted; no reboot takes place.

     RB_POWERDOWN  If used in conjunction with RB_HALT, and if the system
		   hardware supports the function, the system will be powered
		   off.

     RB_USERREQ	   By default, the system will halt if reboot() is called
		   during startup (before the system has finished
		   autoconfiguration), even if RB_HALT is not specified.  This
		   is because panic(9)s during startup will probably just
		   repeat on the next boot.  Use of this option implies that
		   the user has requested the action specified (for example,
		   using the ddb(4) boot reboot command), so the system will
		   reboot if a halt is not explicitly requested.

     RB_INITNAME   An option allowing the specification of an init program
		   (see init(8)) other than /sbin/init to be run when the
		   system reboots.  This switch is not currently available.

     RB_KDB	   Load the symbol table and enable a built-in debugger in the
		   system.  This option will have no useful function if the
		   kernel is not configured for debugging.  Several other
		   options have different meaning if combined with this
		   option, although their use may not be possible via the
		   reboot() call.  See ddb(4) for more information.

     RB_NOSYNC	   Normally, the disks are sync'd (see sync(8)) before the
		   processor is halted or rebooted.  This option may be useful
		   if file system changes have been made manually or if the
		   processor is on fire.

     RB_RDONLY	   Initially mount the root file system read-only.  This is
		   currently the default, and this option has been deprecated.

     RB_SINGLE	   Normally, the reboot procedure involves an automatic disk
		   consistency check and then multi-user operations.
		   RB_SINGLE prevents this, booting the system with a single-
		   user shell on the console.  RB_SINGLE is actually
		   interpreted by the init(8) program in the newly booted
		   system.

		   When no options are given (i.e., RB_AUTOBOOT is used), the
		   system is rebooted from file ``bsd'' 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
		   normally performed (see fsck(8)).

RETURN VALUES
     If successful, this call never returns.  Otherwise, a -1 is returned and
     an error is returned in the global variable errno.

ERRORS
     [EPERM]	   The caller is not the superuser.

SEE ALSO
     ddb(4), crash(8), halt(8), init(8), reboot(8), savecore(8), boot(9),
     panic(9)

HISTORY
     The reboot() function call appeared in 4.0BSD.

BUGS
     Not all platforms support all possible arguments.

OpenBSD 4.9		      September 12, 2008		   OpenBSD 4.9
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