REBOOT(2)           UNIX Programmer's Manual            REBOOT(2)

NAME
     reboot - reboot system or halt processor

SYNOPSIS
     #include <sys/types.h>
     #include <sys/reboot.h>

     reboot(howto, dev)
     int howto;
     dev_t dev;

DESCRIPTION
     _R_e_b_o_o_t is used to cause a system reboot, 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.
     When none of these options is given, the system is rebooted
     from file unix in the file system specified by _d_e_v.
     Currently, this option is ignored, and the device used is
     the current root file system.  An automatic consistency
     check of the disks is then normally performed.

     The bits of _h_o_w_t_o are, in the order interpreted:

     RB_NOSYNC
          No sync (see _s_y_n_c(2)) is to be done.

     RB_DUMP
          A dump of memory is produced on the system's dump dev-
          ice, normally in swap space, as if the system had done
          a panic.

     RB_HALT
          The processor is simply halted; no reboot takes place.
          This 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)unix without
          asking, where _x_x corresponds to the root file system
          device.

     RB_SINGLE
          Normally, the reboot procedure involves an automatic
          disk consistency check and then multi-user operations.
          This prevents the consistency check, rather simply
          booting the system with a single-user shell on the con-
          sole.  This switch is interpreted by the _i_n_i_t(8) pro-
          gram in the newly booted system.

     RB_NOFSCK
          The normal file system consistency check is omitted

Printed 5/22/83                                                 1

REBOOT(2)           UNIX Programmer's Manual            REBOOT(2)

          after the reboot.  This is used for a fast reboot on a
          quiet system with no possibility of file system prob-
          lems.

ERRORS
     _R_e_b_o_o_t will fail if:

     [EPERM]             The process's effective user ID is not
                         the super-user.

SEE ALSO
     crash(8), init(8), reboot(8)

BUGS
     The device specification is not implemented yet.

Printed 5/22/83                                                 2