[zeromq-dev] zmq_poll when socket is closed

[Auer, Jens]

Hi,

what is the semantics of zmq_poll when the remote side of the socket is closed? My sample program
int main()
{
    zmq::context_t ctx;
    zmq::socket_t s1{ctx, ZMQ_PAIR};
    zmq::socket_t s2{ctx, ZMQ_PAIR};

    s1.bind("inproc://1");
    s2.connect("inproc://1");

    auto t = std::thread( [&]() {
        std::this_thread::sleep_for( std::chrono::seconds(5) );
        s1.close();
    });

    zmq::pollitem_t pollitems[] = { {static_cast<void*>(s2), -1, ZMQ_POLLIN + ZMQ_POLLERR + ZMQ_POLLOUT, 0} };

    auto rc = zmq::poll(pollitems, 1);

    std::cout << rc << std::endl;
    std::cout << pollitems[0].revents;

    t.join();

    return 0;
}

prints 2 which is ZMQ_POLLOUT. However, I cannot see this in the documentation.

Best wishes,
  Jens

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