add

# File ext/syslog/lib/syslog/logger.rb, line 203
  def add severity, message = nil, progname = nil, &block
    severity ||= ::Logger::UNKNOWN
    @level <= severity and
      @@syslog.log( (LEVEL_MAP[severity] | @facility), '%s', formatter.call(severity, Time.now, progname, (message || block.call)) )
    true
  end