reboot(2) - NetBSD Manual Pages

REBOOT(2)                 NetBSD System Calls Manual                 REBOOT(2)


NAME
reboot -- reboot system or halt processor
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h> #include <sys/reboot.h> int reboot(int howto, char *bootstr);
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 unre- coverable system failures. howto is a mask of options; the system call interface allows the follow- ing 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)netbsd'', where xx is the default disk name, with- out 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 abil- ity 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_POWERDOWN If used in conjunction with RB_HALT, and if the system hardware supports the function, the system will be powered off. RB_INITNAME An option allowing the specification of an init program (see init(8)) other than /sbin/init to be run when the sys- tem 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 inter- preted 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 ``netbsd'' 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 nor- mally performed (see fsck(8)). RB_STRING bootstr is a string passed to the firmware on the machine, if possible, if this option is set. Currently this is only implemented on the sparc and the sun3 ports.
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
ddb(4), crash(8), halt(8), init(8), reboot(8), savecore(8)
HISTORY
The reboot() function call appeared in 4.0BSD. NetBSD 3.0.1 August 18, 2002 NetBSD 3.0.1

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