

INIT(8)                   Minix Programmer's Manual                    INIT(8)


NAME
     init - grandparent of all processes

DESCRIPTION
     The first program started by Minix is init.   The  actions  performed  by
     init can be summarized by this pseudo shell program:

          # Reboot on SIGABRT (sent by the kernel on CRTL-ALT-DEL)
          trap reboot 6

          # Run the system initialization script.
          sh /etc/rc </dev/console >/dev/console 2>&1

          >/etc/utmp
          echo reboot >>/usr/adm/wtmp

          ttys=`cat /etc/ttys`

          # Reread /etc/ttys on a hangup signal.
          trap 'ttys=`cat /etc/ttys`' 1

          # Stop everything on a terminate.
          trap 'ttys=' 15

          while :; do
                  # Wait for a process to exit.
                  wait

                  # Record logout.
                  for tty in $ttys
                  do
                          if exited $tty
                          then
                                  echo "logout $tty" >>/etc/utmp
                                  echo "logout $tty" >>/usr/adm/wtmp
                          fi
                  done

                  # Start a new session.
                  for tty in $ttys
                  do
                          if idle $tty
                          then
                                  stty ... <$tty
                                  getty <$tty >$tty 2>&1 &
                          fi
                  done
          done

     Init naturally has process ID 1, so kill -1 1 should be used to make init
     reload the /etc/ttys file after it has been edited.

     The utmp and wtmp handling is not a dumb as this of course, but  you  get
     the picture.




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INIT(8)                   Minix Programmer's Manual                    INIT(8)


FILES

     /etc/ttys                List of terminals devices.

     /etc/utmp                List of currently logged in users.

     /usr/adm/wtmp            Login/logout history.

SEE ALSO
     ttys(5), utmp(5), boot(8).

AUTHOR
     Kees J. Bot (kjb@cs.vu.nl)













































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