func (r *PipeReader) CloseWithError(err error) error {
	err = r.PipeReader.CloseWithError(err)
	r.wait()
	return err
}

// WaitPipe implements wait-group backend io.Pipe to provide
// synchronization between read() end with write() end.
func WaitPipe() (*PipeReader, *PipeWriter) {
	r, w := io.Pipe()
	var wg sync.WaitGroup
	wg.Add(1)
	return &PipeReader{
			PipeReader: r,
			wait:       wg.Wait,

		return nil, fmt.Errorf("directory %v does not exist and could not be created: %w", opts.Directory, err)
	}

	if opts.FileNameFunc == nil {
		opts.FileNameFunc = defaultFilenameFunc
	}

	pr, pw := xioutil.WaitPipe()

	w := &Writer{
		opts: opts,
		pw:   pw,
		pr:   pr,
	}

	if w.f == nil {
		if err := w.rotate(); err != nil {
			return nil, fmt.Errorf("Failed to create log file: %w", err)
		}
	}