[zeromq-dev] Access to underlying Linux socket?

[Luca Boccassi]

On Feb 10, 2016 20:39, "Mark Gillott" <mgillott at brocade.com> wrote:
>
> On Wed, 2016-02-10 at 20:45 +0100, Pieter Hintjens wrote:
> > You can't do this really, since one ZeroMQ socket can map to 0..n
> > system sockets.
> >
>
> Had a feeling that was going to be the case.
>
> > There is a new option on libzmq master that lets you pre-configure a
> > FD and give it to ZeroMQ to use for its first pipe. (ZMQ_USE_FD).
> >
>
> Care to expand a bit more? Is there something (test code? source module)
> you can point me at?

I can point you to the guy who developed that option. He sits a few meters
from you in the same office and he has an awesome beard. :-)

> > A custom hook to configure new sockets is a nice idea.
> >
>
> So you register a hook with a newly created socket and you would get a
> callback just prior to any bind/connect. Is that the idea? In czmq
> terms, something like:
>
> s = zsock_new(ZMQ_REP)
> zsock_configure(s, myfunc, myarg)
> zsock_bind(s)
>
> The callback would be provided with the base socket?

Nice. That could work because all actual system sockets are created after
bind/connect. And in CZMQ we could add a global zys switch that applies it
automatically to all sockets to make it more convenient.

But the problem is that such callback should be executed for all sockets,
be they TCP or IPC or inproc. So, there needs to be a way to discriminate
somehow, as what you can do with the FD varies wildly.

It could be left to the application developer to be careful, but I think
that's confusing and likely to cause troubles.

Kind regards,
Luca Boccassi
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