REBOOT(2) UNIX Programmer's Manual REBOOT(2) NAME reboot - reboot system or halt processor SYNOPSIS #include reboot(howto) int howto; DESCRIPTION _R_e_b_o_o_t reboots the system, and is invoked automatically in the event of unrecoverable system failures. _H_o_w_t_o is a mask of options passed to the bootstrap program. The system call interface permits only RB_HALT or RB_AUTOBOOT to be passed to the reboot program; the other flags are used in scripts stored on the console storage media, or used in manual bootstrap procedures. When none of these options (e.g. RB_AUTOBOOT) is given, 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. The bits of _h_o_w_t_o are: RB_HALT the processor is simply halted; no reboot takes place. RB_HALT should be used with caution. RB_ASKNAME Interpreted by the bootstrap program itself, causing it to inquire as to what file should be booted. Normally, the system is booted from the file "xx(0,0)vmunix" without asking. RB_SINGLE Normally, the reboot procedure involves an automatic disk consistency check and then multi-user operations. RB_SINGLE prevents the consistency check, rather simply booting the system with a single-user shell on the con- sole. RB_SINGLE is interpreted by the _i_n_i_t(8) program in the newly booted system. This switch is not avail- able from the system call interface. Only the super-user may _r_e_b_o_o_t a machine. RETURN VALUES 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. ERRORS [EPERM] The caller is not the super-user. Printed 11/26/99 May 9, 1985 1 REBOOT(2) UNIX Programmer's Manual REBOOT(2) SEE ALSO crash(8), halt(8), init(8), reboot(8) BUGS The notion of ``console medium'', among other things, is specific to the VAX. Printed 11/26/99 May 9, 1985 2