How to handle SIGINT raised by a native plugin?

I have a native plugin that can raise a SIGINT if it encounters a fatal error. However this causes Unity to crash instantly. Is there any way to make Unity handle the SIGINT nicely without dying?

The current workaround I'm using has a callback in C# code that sets isPlaying = false or calls Application.Quit()

This workaround will not work for fatal errors that absolutely require the application to halt since the above C# code can be modified by the user.