How to detect pending system shutdown on Linux?

Question

I am working on an application where I need to detect a system shutdown. However, I have not found any reliable way get a notification on this event.

I know that o

Answer 1

When the system shuts down, the rc.d scripts are called.

Maybe you can add a script there that sends some special signal to your program.

However, I doubt you can stop the system shutdown that way.