Question

Any time my program stops execution (either when shut down by cmd-c or when it encounters an exception), I want to take a few actions to shut down properly.

When I do cmd-c, I receive the signal TERM. What signal is sent when the program encounters an exception that is raised? How do I trap this with Signal.trap(…)?

Answer 1

You could wrap your code in a begin-ensure-end block. It would catch exceptions and CTRL-C. (You could add a rescue clause before the ensure).

begin
  sleep 10 #try CTRL-C here
  raise "kaboom" #RuntimeError
ensure
  puts "This must be printed no matter what."
end