Netcat cannot communicate with the socket

[jefferson-julio]

When I tried to echo a string into the socket via netcat, the cl-sipc:hook couldn't catch the message.

I used:

echo "test" | nc -U /tmp/sipc.socket

On my server:

(defparameter rc
            (cl-sipc:hook
              socketf
              #'(lambda (err)
                  (format t "err: ~a~%" err)
                  (force-output)
                  t)
              #'(lambda (tipo mensagem)
                  (sipc:respond (format nil "olá o/~%"))
                  (format t "~a ~a~%" tipo mensagem)
                  t)))

When I exit netcat with Control+C, the Lisp code prints "err: CLOSED" though, indicating that the connection somehow occurred, but the library didn't catch the message.

When I send the same message via the library funcion cl-sipc:send-quick, it works, the message is printed and a response is sended, but through netcat, don't. I also tried doing the same with socat.