Signal Handling: Ruby vs JRuby

Output

orange:~ $ ruby signal_handling.rb 
pid 81402 is sleeping...
^CRuby ensure was run!
Ruby at_exit was run!
signal_handling.rb:34:in `sleep': Interrupt
	from signal_handling.rb:34

orange:~ $ jruby signal_handling.rb 
pid 81431 is sleeping...
^CJava shutdown hook was run!
orange:~ $ jruby signal_handling.rb emulate_mri_signals
pid 81533 is sleeping...
^CRuby ensure was run!
Ruby at_exit was run!
signal_handling.rb:13: Interrupt (Interrupt)
	from :1:in `call'
	from :1
Java shutdown hook was run!
orange:~ $ 

signal_handling.rb

if RUBY_PLATFORM == "java"
  if ARGV.include?('emulate_mri_signals')
    # Emulate MRI style signal handling: i.e. ensure gets executed and so do any an_exit hooks
    trap('SIGTERM') {
      raise SignalException, 'SIGTERM'
    }
  
    trap('SIGHUP') {
      raise SignalException, 'SIGHUP'
    }
  
    trap('SIGINT') {
      raise Interrupt
    }
  end
  # Java shutdown hook to make sure they're still called with the custom signal handlers
  require 'java'
  class ShutdownHook
    include java.lang.Runnable
  
    def run
        puts "Java shutdown hook was run!"
    end
  end
  java.lang.Runtime.getRuntime.addShutdownHook(java.lang.Thread.new(ShutdownHook.new))
end

at_exit {
  puts "Ruby at_exit was run!"
}

puts "pid #{$$} is sleeping..."
begin
  sleep
ensure
  puts "Ruby ensure was run!"
end