sigterm.rb

#!/usr/bin/env ruby

def exit_upon(*signals)
  process_going_down = false
  signals.map { |signal| signal.to_s.upcase }.each do |signal|
    Signal.trap(signal) do
      exit! if process_going_down   # terminate if still executing the given block
      process_going_down = true
      yield(signal) if block_given?
      exit! 0
    end
  end
end

exit_upon(:int, :term) do |signal|
  puts "Received #{signal}, starting to do a long cleanup work..."
  sleep 10
  puts "Done cleaning up, exiting..."
end

sleep 1000