RC0(1M)              INTERACTIVE UNIX System              RC0(1M)



          NAME
               rc0 - run commands performed to stop the operating system

          SYNOPSIS
               /etc/rc0

          DESCRIPTION
               This file is executed at each system state change that needs
               to have the system in an inactive state.  It is responsible
               for those actions that bring the system to a quiescent
               state, traditionally called ``shutdown.''

               One system state requires this procedure:  state 0 (the sys-
               tem halt state).  Whenever a change to this state occurs,
               the /etc/rc0 procedure is run.  The entry in /etc/inittab
               might read:

                    s0:0:wait:/etc/rc0 >/dev/console 2>&1 </dev/console

               Some of the actions performed by /etc/rc0 are carried out by
               files in the directory /etc/shutdown.d.  and files beginning
               with K in /etc/rc0.d.  These files are executed in ASCII
               order (see FILES below for more information), terminating
               some system service.  The combination of commands in
               /etc/rc0 and files in /etc/shutdown.d and /etc/rc0.d deter-
               mines how the system is shut down.

               The recommended sequence for /etc/rc0 is:

               Stop System Services and Daemons.

                    Various system services (such as Remote File Sharing or
                    LP Spooler) are gracefully terminated.
                    When new services are added that should be terminated
                    when the system is shut down, the appropriate files are
                    installed in /etc/shutdown.d and /etc/rc0.d.

               Terminate Processes

                    SIGTERM signals are sent to all running processes by
                    killall(1M).  Processes stop themselves cleanly if sent
                    SIGTERM.

               Kill Processes

                    SIGKILL signals are sent to all remaining processes; no
                    process can resist SIGKILL.
                    At this point the only processes left are those associ-
                    ated with /etc/rc0 and processes 0 and 1, which are
                    special to the operating system.

               Unmount All File Systems



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          RC0(1M)              INTERACTIVE UNIX System              RC0(1M)



                    Only the root file system (/) remains mounted.

          FILES
               The execution by /bin/sh of any files in /etc/shutdown.d
               occurs in ASCII sort-sequence order.  See rc2(1M) for more
               information.

          SEE ALSO
               killall(1M), rc2(1M), shutdown(1M).














































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