Re: New patch for server sockets and datagram (UDP) support.

[Stefan Monnier]

> "Stefan Monnier" <monnier+gnu/address@hidden> writes:
> 
> > > > > The following special call returns t iff a given KEY VALUE
> > > > > pair is supported on this system:
> > > > >   (make-network-process :feature KEY VALUE)  */)
> > > > 
> > > > Hmm... this looks a bit strange.  Can you give some examples?
> > > > Especially, what do you supply as VALUE?
> > > > 
> > > 
> > > It simply tests whether using KEY VALUE as arguments to 
> > > make-network-stream
> > > is supported, e.g. :datagram t, :nowait t, :family 'local.
> > 
> > I suggest to use `subfeatures' for that:
> > 
> >    (provide 'network '(:datagram :nowait :family ...))
> 
> I don't want to invent something new here if it isn't needed, but the
> problem here is that the proper setings here are determined at
> compile-time, so it's not just a question of putting a (provide...)
> line somewhere in a lisp file -- since that information is not
> available to lisp [that's why I provided the :feature interface].

Then put the call to `feature' in the C code.

> > so you can then check
> > 
> >    (featurep 'network :datagram)
> > 
> But how do you test for availability of :family 'local ?

Whichever way you feel like, e.g. (featurep 'network :family:local).
I guess I just don't understand the question.  Also, it's often
good enough to just call make-network-process and see if it succeeds.
You only really need to provide/use `featurep' in order to know whether
something would be ignored or not.


        Stefan