running? (Daemons::Pid)

    # File lib/daemons/pid.rb, line 6
        def Pid.running?(pid, additional = nil)
          match_pid = Regexp.new("^\\s*#{pid}\\s")
          got_match = false

          ps_all = IO.popen("ps ax") # the correct syntax is without a dash (-) !

          ps_all.each { |psline|
            next unless psline =~ match_pid
            got_match = true
            got_match = false if additional and psline !~ /#{additional}/
            break
          }
          ps_all.close

          # an alternative would be to use the code below, but I don't know whether this is portable

          # `ps axo pid=`.split.include? pid.to_s

          return got_match
        end