NAME

       boot — halt or reboot the system

SYNOPSIS

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

       void
       boot(int howto);

DESCRIPTION

       The  boot()  function  handles  final system shutdown, and either halts or reboots the system.  The exact
       action to be taken is determined by the flags passed in howto and  by  whether  or  not  the  system  has
       finished autoconfiguration.

       If the system has finished autoconfiguration, boot() does the following:

             1.   If  this  is  the first invocation of boot() and the RB_NOSYNC flag is not set in howto, syncs
                  and unmounts the system disks by calling vfs_unmountall(9).

             2.   Disables interrupts.

             3.   If rebooting after a crash (i.e., if RB_DUMP is set in howto, but RB_HALT  is  not),  saves  a
                  system crash dump.

             4.   Runs any shutdown hooks previously registered.

             5.   Prints a message indicating that the system is about to be halted or rebooted.

             6.   If RB_HALT is set in howto, halts the system.  Otherwise, reboots the system.

       If  the  system has not finished autoconfiguration, boot() runs any shutdown hooks previously registered,
       prints a message, and halts the system.

SEE ALSO

       vfs_unmountall(9)

Debian                                          February 14, 1997                                        BOOT(9)