    # File bin/experimental-filter.rb, line 63
    def daemon(nochdir, noclose)
      pid = fork
      if pid == -1
        return -1
      elsif pid != nil
        exit 0
      end

      Process.setsid()

      Dir.chdir('/') if (nochdir == 0)
      if noclose == 0
        devnull = open("/dev/null", "r+")
        $stdin.reopen(devnull)
        $stdout.reopen(devnull)
        p = IO::pipe
        pid = fork
        if pid == -1
          $stderr.reopen(devnull)
        elsif pid == nil
          p[1].close
          STDIN.reopen(p[0])
          p[0].close
        else
          p[0].close
          $stderr.reopen(p[1])
          p[1].close
        end
      end
      return 0
    end