code: func (container *Container) StopSignal() int {
  	var stopSignal syscall.Signal
  	if container.Config.StopSignal != "" {
  		stopSignal, _ = signal.ParseSignal(container.Config.StopSignal)
  	}
  
  	if int(stopSignal) == 0 {
  		stopSignal, _ = signal.ParseSignal(signal.DefaultStopSignal)
  	}
  	return int(stopSignal)
  }
docs: // StopSignal returns the signal used to stop the container.