[zeromq-dev] Question on ZMQ_POLLERR -- what exact error(s) this flag should represent?

Matt Connolly matt.connolly at me.com
Thu Sep 26 23:04:07 CEST 2013

It’s useful. I used it recently to build an event loop that would respond to ZMQ messages or data received on a plain old socket (pipe, tcp or stdin) and detect errors on that plain old socket.


On 27 Sep 2013, at 6:59 am, Artem Vysochyn <artem.vysochyn at gmail.com> wrote:

> Sorry, the typo: >>>> ... driving non-ZMQ-sockets ...
> 2013/9/26 Artem Vysochyn <artem.vysochyn at gmail.com>:
>> hello there,
>> I'm reading the api guide, http://api.zeromq.org/3-2:zmq-poll, and a
>> bit confused by definition ZMQ_POLLERR.
>> Here it's:
>> For standard sockets, this flag is passed through zmq_poll() to the
>> underlying poll()system call and generally means that some sort of
>> error condition is present on the socket specified by fd. For ØMQ
>> sockets this flag has no effect if set in events, and shall never be
>> returned in revents by zmq_poll().
>> <<
>> 1. So does it mean  that this flag is sort of "internal thing" for
>> zmq_poll() for driving non-sockets?
>> 2. External clients of zmq_poll() will not benefit from it  if they
>> pass to poller ZMQ_POLLERR as event of interest?
>> Thanks in advance.
>> -artemv
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