DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org DCBCB383E80D
To: <cygwin@cygwin.com>
References: <000301d638db$dced49a0$96c7dce0$@gmail.com>
 <20200603132320.GH6801@calimero.vinschen.de>
In-Reply-To: <20200603132320.GH6801@calimero.vinschen.de>
Subject: Sv: AF_UNIX/AF_LOCAL
Date: Thu, 11 Jun 2020 08:37:20 +0200
Message-ID: <004101d63fba$c2823b30$4786b190$@gmail.com>
MIME-Version: 1.0
Thread-Index: AQKMIPtXPIsjGwU54GfU1q+yL/x+vAG1tuA9p1mDbjA=
Content-Language: en-gb
From: Kristian Ivarsson via Cygwin <cygwin@cygwin.com>
Reply-To: sten.kristian.ivarsson@gmail.com
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Sender: "Cygwin" <cygwin-bounces@cygwin.com>

> On Jun  2 14:46, Kristian Ivarsson via Cygwin wrote:
> > Hey folks (probably Corinna more specifically)
> >
> > As far as I know the "unix domain socket implementation" is not really
> > complete
> >
> > We tried it and it didn't work for our purposes (the symptoms were
> > UDP-like, i.e. it seemed that some messages were lost along the way
> > (or possibly ended up in the wrong order)
> 
> That shouldn't occur because the current AF_UNIX implementation is using
> AF_INET sockets under the hood, and it doesn't implement any packet
> caching overriding the OS buffers.

Maybe the symptoms were explained bad. The real observable symptoms are that
the endpoint doesn't get a message once in a while and it, depending on
testcase, just "hangs" in a reading block though the other side successfully
sends them and in other testcases (where we have a sequence number in the
message) msg number X+1 ends up before X (etc) (which is ok with
DGRAM-semantics but not generally with AF_UNIX (as far as I understand))

Maybe the description of that messages are lost were bad, but maybe they are
dropped (perhaps by the fact that the socket-buffer or such is full (just a
wild guess))

If we get some spare time, we will try to reproduce this in a more simple
manner (i.e. a small test-program)

Keep up the good work,
Kristian


[snip]

 
> Corinna
> 
> --
> Corinna Vinschen
> Cygwin Maintainer
> --
> Problem reports:      https://cygwin.com/problems.html
> FAQ:                  https://cygwin.com/faq/
> Documentation:        https://cygwin.com/docs.html
> Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple

--
Problem reports:      https://cygwin.com/problems.html
FAQ:                  https://cygwin.com/faq/
Documentation:        https://cygwin.com/docs.html
Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple