How to get webots eixt message?

[sf-ccc]

Hi,
i have a question that webots always show a warning about my controller is still running.I wonder how to get webots exit message to destroy my controller resources.I found supervisor has such a event which named EVENT_QUIT,how could i get this? Maybe api or other method?

[omichel]

When Webots quits or need to terminate a controller (due to a close, reload or revert operation), the wb_robot_step function returns -1, which means that your controller should quit the control loop, proceed to destroy its resources and quit as well.