# File lib/pygments/popen.rb, line 57
    def stop(reason)
      if @pid
        begin
          Process.kill('KILL', @pid)
          Process.waitpid(@pid)
        rescue Errno::ESRCH, Errno::ECHILD
        end
      end
      @log.info "[#{Time.now.iso8601}] Killing pid: #{@pid.to_s}. Reason: #{reason}"
      @pid = nil
    end