fork-you.rb

puts "I am #{$$}"

trap('TERM') { puts "[#{Time.now}] #{$$}: Got TERM!" }

pid1 = fork

# child
if !pid1
  puts "Child is #{$$}"
  # create a sub-child
  pid2 = fork
  if !pid2
    puts "Sub-child is #{$$}"
    sleep 5
  end
  # child send a signal to the grandchild
  if pid2
    sleep 3
    Process.kill("TERM", pid2)
  end

# parent
else
  sleep 1
  # send a signal to ourselves
  Process.kill("TERM", $$)
  # send a signal to the child
  sleep 1
  Process.kill("TERM", pid1)
  # wait for everyone else to finish
  sleep 10
end

I am 16371
Child is 16372
Sub-child is 16373
[2012-04-09 14:50:50 -0700] 16371: Got TERM!
[2012-04-09 14:50:51 -0700] 16372: Got TERM!
[2012-04-09 14:50:52 -0700] 16373: Got TERM!