[zeromq-dev] Access to underlying Linux socket?

[Mark Gillott]

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?

> 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? 

Thanks,

Mark

> -Pieter
> 
> On Wed, Feb 10, 2016 at 6:29 PM, Jerry Scharf
> <scharf at lagunawayconsulting.com> wrote:
> > Mark,
> >
> > As a comment from the peanut gallery, it is generally a bad thing to
> > leak that information up the protocol stack. Rather than getting that
> > information back, it might be better to be able to attach user callout
> > hooks at the places where you would want to make changes. That way there
> > is still a unified code base and you can write and install your hook
> > code to do your special work. It also allows people to do other things
> > without needing to invent another mechanism.
> >
> > That's the way I have liked it the best when these things came up with
> > other systems.
> >
> > jerry
> >
> > On 02/10/2016 07:50 AM, Mark Gillott wrote:
> >> [I'm sure this must have been asked before, but can't find anything]
> >>
> >> Is there a facility or method to "map" a 0MQ socket to its supporting
> >> Linux socket?
> >>
> >> Working with a Linux kernel that has some new networking facility
> >> together with socket extensions to control the facility. With vanilla
> >> sockets this results in calls to setsockopt(sockfd, SOL_SOCKET, ...).
> >>
> >> But how do I manage 0MQ sockets wanting to enable/control this facility?
> >> Can I obtain the Linux socket and thus use native setsockopt() calls? Or
> >> is the only option to generate (& maintain) zmq_set_xyz() & zmq_xyz()
> >> patches for the base ZMQ library (together with the various language
> >> binding - C, Python, Perl, etc)?
> >>
> >> Cheers,
> >>
> >> Mark
> >>
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