start_exec (Daemons::Application)

    # File lib/daemons/application.rb, line 103
        def start_exec
          if options[:backtrace]
            puts "option :backtrace is not supported with :mode => :exec, ignoring"
          end

          unless options[:ontop]
            Daemonize.daemonize(output_logfile, @group.app_name)
          else
            Daemonize.simulate(output_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(), *(@app_argv || []))
          #Kernel.exec(script(), *ARGV)
        end