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Subject:	Re: Unix Domain Socket Limitation?
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Date:	Wed, 25 Nov 2020 17:27:22 -0500
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From:	Ken Brown via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Ken Brown <kbrown AT cornell DOT edu>
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On 11/25/2020 4:47 PM, Norton Allen wrote:
> In my recent tests, it appears as though it is not possible to successfully 
> connect via two Unix Domain sockets from one client application to one server 
> application.
> 
> Specifically, if I create a server which listens on a Unix Domain socket and a 
> client, which attempts to connect() twice, both seem to lock up. This is not the 
> behavior under Linux.
> 
> I will be happy to work up a minimal example if it is helpful in tracking this 
> down. I wanted to start by asking whether this is a known limitation and/or if 
> there is something about the Cygwin implementation that makes this sort of thing 
> very difficult.

A minimal example would be extremely helpful.

Corinna can answer questions about limitations in the current implementation. 
But there is a new implementation under development.  It's in the topic/af_unix 
branch of the Cygwin git repository if you're interested in looking at it.

Corinna began working on this a couple years ago, and I've recently been trying 
to finish it.  I've made quite a bit of progress, but there's still more to do 
and undoubtedly many bugs.  So any test cases you have would be very useful.

Ken
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