# File gtk/sample/misc/t-gtksocket.rb, line 45
  def plug(arg)
    if @pid != 0
      Process.kill("SIGKILL", @pid)
      Process.waitpid(@pid)
      begin
        @table.remove(@socket) unless @socket.destroyed?
      rescue ArgumentError
        # socket has been destroyed because child process finished unexpectedly
      end
      @socket = Gtk::Socket.new
      @table.attach(@socket, 1, 2, 0, 1, Gtk::FILL, Gtk::FILL, 5, 5)
      @socket.set_size_request(150, 190)
      @socket.show
      @xid = @socket.id
    end
    @pid = fork { exec "ruby t-gtkplug.rb -x #{@xid} Plug#{arg}" }
  end