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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
may be invoked automatically in the event of unrecoverable system failures. Programs other than
reboot(8) should not call reboot(). Shutdown(8) or a higher-level API will shut the system down
cleanly.
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. 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 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 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 pro-cessor processor
cessor 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 super-user.
SEE ALSO
shutdown(8), halt(8), launchd(8), reboot(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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