return 0, io.EOF
	}
	n, err = s.r.Read(p)
	if atomic.LoadUint32(&s.closed) == 1 {
		return 0, io.EOF
	}
	return n, err
}

func (s *safeCloser) Close() error {
	atomic.CompareAndSwapUint32(&s.closed, 0, 1)
	return nil