dir (Daemons::Pid)

    # File lib/daemons/pid.rb, line 34
        def Pid.dir(dir_mode, dir, script)
          # nil script parameter is allowed as long as dir_mode is not :script

          return nil if dir_mode == :script && script.nil?

          case dir_mode
            when :normal
              return File.expand_path(dir)
            when :script
              return File.expand_path(File.join(File.dirname(script),dir))
            when :system
              return '/var/run'
            else
              raise Error.new("pid file mode '#{dir_mode}' not implemented")
          end
        end