[zeromq-dev] STREAM socket not closing.

[Pieter Hintjens]

To use a ZMQ_STREAM socket as client, you have to fetch its identity
after connecting. It's not entirely intuitive, e.g.:

    void *client = zmq_socket (ctx, ZMQ_STREAM);
    zmq_connect (client, "tcp://localhost:9080");
    uint8_t id [256];
    size_t id_size = 256;
    zmq_getsockopt (client, ZMQ_IDENTITY, id, &id_size);
    zmq_send (client, id, id_size, ZMQ_SNDMORE);
    zmq_send (client, "GET /\n\n", 7, 0);


On Fri, Jan 10, 2014 at 9:55 AM, Laurent Alebarde <l.alebarde at free.fr> wrote:
> Le 10/01/2014 07:10, Matt Connolly a écrit :
>
> Dear list,
>
>
> I’m looking at using the STREAM socket to interface with some plain old TCP
> clients, however, there seems to be two things I’m missing:
>
> 1. How do I send a message to a client first? Once the client sends a
> message I can get the identity frame and use that to reply. How do I send a
> message before receiving any data?
>
> ZMQ_STREAM is like ROUTER. In my understanding and small experience, you
> cannot.
>
>
> 2. Closing sockets. I see in the docs that a socket can be closed by sending
> the identity frame followed by a zero length frame. However, this does not
> seem to be working.
>
> I’m expecting to successfully read 0 bytes from the TCP socket meaning that
> the connection was actively closed, and no error codes. Instead by TCP
> socket recv blocks forever. The only way I can get this to happen is to
> close the ZMQ socket, which is not possible when I am using bind and talking
> to multiple TCP clients.
>
>
> Cheers,
> Matt
>
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