if err != nil {
		return nil, err
	}

	_, _, err = z.u.WriteMsgUnix(data, rights, nil)
	if err != nil {
		return nil, err
	}

	// wait for ack
	return z.readMessage(readWriteDeadline)
}

func (z *ZtunnelConnection) readMessage(timeout time.Duration) (*zdsapi.WorkloadResponse, error) {
	m, _, err := readProto[zdsapi.WorkloadResponse](z.u, timeout, nil)
	return m, err
}

              &num_retvals, &forward_op, tape.get(), registry);
  ASSERT_EQ(errors::OK, s.code()) << s.message();

  string read_message;
  s = forward_op.attrs.Get("message", &read_message);
  ASSERT_EQ(errors::OK, s.code()) << s.message();
  ASSERT_EQ(read_message, message);
}

absl::Status RecordOperationWithNullGradientFunctionModel(
    AbstractContext* ctx, absl::Span<AbstractTensorHandle* const> inputs,