func (w *Writer) Err(m string) error {
	_, err := w.writeAndRetry(LOG_ERR, m)
	return err
}

// Warning logs a message with severity [LOG_WARNING], ignoring the
// severity passed to New.
func (w *Writer) Warning(m string) error {
	_, err := w.writeAndRetry(LOG_WARNING, m)
	return err
}

// Notice logs a message with severity [LOG_NOTICE], ignoring the
// severity passed to New.