public function export()
    {
        openlog($this->identity, $this->options, $this->facility);
        foreach ($this->messages as $message) {
            if (syslog($this->_syslogLevels[$message[1]], $this->formatMessage($message)) === false) {
                throw new LogRuntimeException('Unable to export log through system log!');
            }
        }
        closelog();
    }