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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)