start_exec (Daemons::Application)

    # File lib/daemons/application.rb, line 89
        def start_exec
          unless options[:ontop]
            Daemonize.daemonize(logfile, @group.app_name)
          else
            Daemonize.simulate(logfile)
          end

          # note that we cannot remove the pid file if we run in :ontop mode (i.e. 'ruby ctrl_exec.rb run')
          @pid.pid = Process.pid

          ENV['DAEMONS_ARGV'] = @controller_argv.join(' ')
          # haven't tested yet if this is really passed to the exec'd process...

          Kernel.exec(script(), *ARGV)
        end