You could save a global property just before calling Shutdown(). Then, in start.src that property is read, and if it returns error (unset property), you know POL crashed. If property exists, you have to erase it.
As far as I know, CTRL+C is reserved command and thus you cannot manipulate its actions. You could however create a script shutdownalias.src into scripts/console/, add a command, say, CTRL+X, and use that instead of hardcoded shutdown.
Scriptwise the whole setting would look like this.
// Inside the program block...
if (GetGlobalProperty("CleanShutdown"))
Print("POL did not crash.");
EraseGlobalProperty("CleanShutdown");
else
Print("POL crashed!");
endif
And before every other Shutdown() function call..
Code:
SetGlobalProperty("CleanShutdown", 1);
I do not use this myself, and thus cannot guarantee that it would work for sure. Anyhow this should give you an idea.