REBOOT(2) 1990 REBOOT(2) NNAAMMEE reboot - reboot system or halt processor SSYYNNOOPPSSIISS ##iinncclluuddee <<ssyyss//rreebboooott..hh>> rreebboooott((hhoowwttoo)) iinntt hhoowwttoo;; DDEESSCCRRIIPPTTIIOONN _R_e_b_o_o_t reboots the system. Only the super-user may reboot a machine on demand. However, a reboot is invoked automati- cally in the event of unrecoverable system failures. _H_o_w_t_o is a mask of options; the system call interface passes 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 ``_x_x(0,0)vmunix'', where _x_x 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 possi- ble on all systems.) RB_DUMP Dump kernel memory before rebooting; see _s_a_v_e_c_o_r_e(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 _i_n_i_t(8) other than ``/sbin/init'' to be run when the system reboots. This switch is not currently available. Printed 7/27/90 June 1 REBOOT(2) 1990 REBOOT(2) 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 _r_e_b_o_o_t call. See _k_a_d_b(4) for more information. RB_NOSYNC Normally, the disks are sync'd (see _s_y_n_c(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 as a no-op. 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 actu- ally interpreted by the _i_n_i_t(8) program in the newly booted system. When no options are given (i.e., RB_AUTOBOOT is used), 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 (see _f_s_c_k(8)). RREETTUURRNN VVAALLUUEESS If successful, this call never returns. Otherwise, a -1 is returned and an error is returned in the global variable _e_r_r_n_o. EERRRROORRSS [EPERM] The caller is not the super-user. SSEEEE AALLSSOO kadb(4), crash(8), halt(8), init(8), reboot(8), savecore(8) BBUUGGSS The HP300 implementation supports neither RB_DFLTROOT or RB_KDB. Printed 7/27/90 June 2