class DRb::DRbTCPSocket

def close

client-server session.
returned by #open or by #accept, then it closes this particular
listening for new connections altogether. If this is an instance
If this is an instance returned by #open_server, then this stops

Close the connection. 
def close
  shutdown
  if @socket
    @socket.close
    @socket = nil
  end
  close_shutdown_pipe
end