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OpenDarwin 7.2.1 - man page for reboot (opendarwin section 2)

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REBOOT(2)			     BSD System Calls 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 super-user 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 con-
		   sole 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.  This option should be
		   used with caution.

     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 cur-
		   rently 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 debug-
		   ging.  Several other options have different meaning if combined with this
		   option, although their use may not be possible via the reboot() call.  See
		   kadb(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 pro-
		   cessor 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 super-user.

SEE ALSO
     kadb(4), crash(8), halt(8), init(8), reboot(8), savecore(8)

BUGS
     The HP300 implementation supports neither RB_DFLTROOT nor RB_KDB.

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

4th Berkeley Distribution		   June 4, 1993 		4th Berkeley Distribution
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