On Thu, 2019-10-24 at 15:35 +0200, Arnaud Loonstra wrote: > Hi all, > > I'm wondering what is the best approach to polling a non-zmq socket > using czmq. It doesn't seem documented? > > I can add a fd as follows: > > ... > s=socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1) > zpoller_add(poller, &s); > ... > > If I then poll zpoller_wait returns on activity however it's not a > valid > zsock_t instance: > > zsock_t *which = (zsock_t *)zpoller_wait(poller, -1); > > zsock_is(which) will return false. I've found 'which' is just what > you > added to the poller so if I cast to an int it will resolve to the > correct filedescriptor number. > > So either I cast it back to an int or I keep checking the pointer > addresses. However casting an int to zsock_t doesn't feel safe. > > So question is what is best/safest approach? > > Rg, > > Arnaud
Strange, that should work - the zpoller_add documentation is missing it, but the zpoller_new doc clearly says a file handle is supported, and the implementation confirms it - you should be able to pass it a file descriptor as you are doing. Did you by any chance compile libzmq with draft apis and the new zmq_poller APIs? That changes the implementation quite a bit, and there might be regressions yet unspotted. -- Kind regards, Luca Boccassi
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