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boot man page

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BOOT(9)                FreeBSD Kernel Developer's Manual               BOOT(9)


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 auto-
     configuration.

     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 shut-
     down hooks previously registered, prints a message, and halts the system.


SEE ALSO

     vfs_unmountall(9)

FreeBSD 6.2                    February 14, 1997                   FreeBSD 6.2


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