class Puma::Cluster

def setup_signals
  if @options[:fork_worker]
    Signal.trap "SIGURG" do
      fork_worker!
    end
    # Auto-fork after the specified number of requests.
    if (fork_requests = @options[:fork_worker].to_i) > 0
      @events.register(:ping!) do |w|
        fork_worker! if w.index == 0 &&
          w.phase == 0 &&
          w.last_status[:requests_count] >= fork_requests
      end
    end
  end
  Signal.trap "SIGCHLD" do
    wakeup!
  end
  Signal.trap "TTIN" do
    @options[:workers] += 1
    wakeup!
  end
  Signal.trap "TTOU" do
    @options[:workers] -= 1 if @options[:workers] >= 2
    wakeup!
  end
  master_pid = Process.pid
  Signal.trap "SIGTERM" do
    # The worker installs their own SIGTERM when booted.
    # Until then, this is run by the worker and the worker
    # should just exit if they get it.
    if Process.pid != master_pid
      log "Early termination of worker"
      exit! 0
    else
      @launcher.close_binder_listeners
      stop_workers
      stop
      @events.fire_on_stopped!
      raise(SignalException, "SIGTERM") if @options[:raise_exception_on_sigterm]
      exit 0 # Clean exit, workers were stopped
    end
  end
end