[zeromq-dev] zmq_recv documentation

Varol Okan varokan at movingsatellites.com
Wed Apr 28 13:41:47 CEST 2010


Never mind with the documentation, I am using the C++ class, which
returns true/false.

Note to self: "Never write questions after official bedtime"

Varol :)

Varol Okan wrote:
> I was trying to get zmq_poll working but for some reason my app crashes
> event when I init the ctx with the ZMQ_POLL flag.
>
> It'll crash inside zmq_poll at :
> pollfds [npollfds].fd = app_thread->get_signaler ()->get_fd ();
> for some reasons app_thread->get_signaler () is NULL.
>
>
> Anyhow, I just thought I drop a line wrt the zmq_recv documentation.
>
> Looking at the *ZMQ_NOBLOCK *section it states
> Specifies that the operation should be performed in non-blocking mode.
> If there are no messages available to be dequeued from the underlying
> /message queue/ associated with /socket/, the /zmq_recv()/ function
> shall fail with /errno/ set to EAGAIN.
>
>
> So I was expecting the function to return -1, as stated a few lines
> further down
> *
> RETURN VALUE*
> The /zmq_recv()/ function shall return zero if successful. Otherwise it
> shall return -1 and set /errno/ to one of the values defined below.
>
> However if no msg is available it'll return 0, else 1. ( on Linux )
>
> Smehow there seems to be a disconnect between those two.
>
> Varol :)
>
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