if fd.Destroy != nil {
		fd.Destroy()
	}
	return nil
}

// Close handles the locking for closing an FD. The real operation
// is in the net package.
func (fd *FD) Close() error {
	if !fd.fdmu.increfAndClose() {
		return errClosing(fd.isFile)
	}
	return nil
}

// Read implements io.Reader.
func (fd *FD) Read(fn func([]byte) (int, error), b []byte) (int, error) {
	if err := fd.readLock(); err != nil {

	return err
}

// Close closes the FD. The underlying file descriptor is closed by the
// destroy method when there are no remaining references.
func (fd *FD) Close() error {
	if !fd.fdmu.increfAndClose() {
		return errClosing(fd.isFile)
	}

	// Unblock any I/O.  Once it all unblocks and returns,
	// so that it cannot be referring to fd.sysfd anymore,
	// the final decref will close fd.sysfd. This should happen

func (f *File) Close() error {
	if f == nil {
		return ErrInvalid
	}
	return f.file.close()
}

func (file *file) close() error {
	if !file.fdmu.IncrefAndClose() {
		return &PathError{Op: "close", Path: file.name, Err: ErrClosed}
	}

	// At this point we should cancel any pending I/O.
	// How do we do that on Plan 9?

	err := file.decref()