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Date: Mon, 8 Apr 2013 19:37:27 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Unix domain accept() and getperrname() doesn't return the client address.
Message-ID: <20130408173727.GF10126@calimero.vinschen.de>
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On Mar  8 16:08, Corinna Vinschen wrote:
> On Mar  8 16:44, Noel Grandin wrote:
> > On 2013-03-08 16:37, Corinna Vinschen wrote:
> > >On Mar  8 16:23, Noel Grandin wrote:
> > >>On 2013-03-08 15:29, Corinna Vinschen wrote:
> > >>>You can call connect on both sides. But ultimately you're right, I
> > >>>guess. I never thought about it that way, and it seems nobody used
> > >>>AF_LOCAL datagrams so far. Weird. The problem is that the
> > >>>underlying protocol is AF_INET because Windows doesn't support
> > >>>AF_LOCAL.
> > >>If you're using UDP as your underlying protocol, UDP already
> > >>contains a port you can reply to.
> > >Yes, but the port isn't available to the application which opened a
> > >AF_LOCAL connection.  If recvfrom returns an AF_INET name, it's rather
> > >tricky to convert it into an AF_LOCAL name for a subsequent sendto call.
> > >
> > >[...time passes...]
> > >
> > >Or... are you suggesting that recvfrom returns some kind of fake AF_LOCAL
> > >name, which can be converted back to AF_INET by sendto on the fly?
> > 
> > Yup, sorry, friday afternoon, not being very good with the explaining thing.
> > 
> > It's obviously a localhost connection, so we only need a way of
> > stashing and retrieving the port number, not the host part.
> 
> Right.  That sounds like a reasonable workaround.  After all, the sender
> shouldn't care for the real filename backing the peer socket, it just
> needs something looking like a AF_LOCAL record to address the peer socket
> reliably.
> 
> I think about it, but this will probably not make it into 1.7.18
> anymore.

Or maybe it will.  I just applied a change which creates a funny
filename analoguos to the abstract socket address as described in
Linux' `man 7 unix'(*).  This should help to get a AF_LOCAL datagram
server running.  Please given the next developer's snapshot from
http://cygwin.com/snapshots/ a try.


Corinna

(*) http://linux.die.net/man/7/unix

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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