[zeromq-dev] 0MQ 4 - how to detect closed stream socket ?

[KIU Shueng Chuan]

Being informed about both connects and disconnects might be useful for
other use cases.

Looks like one could practically avoid using bsd tcp sockets now.
On 26 Apr 2014 07:27, "Pieter Hintjens" <ph at imatix.com> wrote:

> Is that what you'd expect? It seems a good minimal solution.
>
> On Fri, Apr 25, 2014 at 11:52 PM, KIU Shueng Chuan <nixchuan at gmail.com>
> wrote:
> > It turns out that this functionality was added in January to libzmq.
> > An empty message is sent both on connect and also upon disconnect.
> >
> > The net effect for my use case is that one receives 2 empty messages when
> > the connection breaks and then when it gets reconnected.
> >
> >
> > A pair of python scripts that demonstrate the behavior (A tcp publisher
> > subscribed using zmq_stream):
> > https://github.com/pijyoi/test_zmqstream
> >
> >
> >
> > On Thu, Apr 24, 2014 at 6:40 PM, Pieter Hintjens <ph at imatix.com> wrote:
> >>
> >> On Thu, Apr 24, 2014 at 12:35 PM, KIU Shueng Chuan <nixchuan at gmail.com>
> >> wrote:
> >>
> >> > Sadly, I am dealing with "publisher" TCP-servers that start sending
> data
> >> > upon client connection. The protocol is some small fixed header
> followed
> >> > by
> >> > a variable length message.
> >> >
> >> > A ZMQ_STREAM server already uses sending of an empty message in order
> to
> >> > disconnect a client. Would be nice if an empty message could be
> received
> >> > by
> >> > the ZMQ_STREAM client upon disconnection.
> >>
> >> This sounds familiar, so may already be implemented. I've not used
> >> ZMQ_STREAM much. Signaling the end of a connection with an empty
> >> message is definitely a decent idea.
> >>
> >> -Pieter
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