if err != nil && err != syscall.ERROR_NOT_FOUND {
		// TODO(brainman): maybe do something else, but panic.
		panic(err)
	}
	// Wait for cancellation to complete.
	fd.pd.waitCanceled(int(o.mode))
	err = windows.WSAGetOverlappedResult(fd.Sysfd, &o.o, &o.qty, false, &o.flags)
	if err != nil {
		if err == syscall.ERROR_OPERATION_ABORTED { // IO Canceled
			err = netpollErr
		}
		return 0, err