Signals.rb

#!/usr/bin/env ruby

if ARGV[0]
  signal =
    case ARGV[0]
    when 'wait'    then :USR1
    when 'restart' then :USR2
    end

  Process.kill(signal, ARGV[1].to_i)
  exit 1
end

trap :USR1 do
  puts 'We will wait bye bye'
  @wait = true
end

trap :USR2 do
  puts 'Ok, restart broooo'
  @wait = false
end

while true
  sleep 1 while @wait

  @wait = false
  puts 'Long process with pid %d' % Process.pid
  sleep 1 while true and not @wait
end