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Re: Unix domain accept() and getperrname() doesn't return the client address.
- From: Corinna Vinschen <corinna-cygwin at cygwin dot com>
- To: cygwin at cygwin dot com
- Date: Mon, 8 Apr 2013 19:37:27 +0200
- Subject: Re: Unix domain accept() and getperrname() doesn't return the client address.
- References: <CANjopZEy2_yzpPpmxFtqBC_jhHNPyh7MHdeCY-QrizRoYM1_7Q at mail dot gmail dot com> <20130304093836 dot GB5468 at calimero dot vinschen dot de> <CANjopZHUZ-Azy+n5P1ZkNJuTb3c3zfj93bGz-pHfWra2aXTfRA at mail dot gmail dot com> <20130307143712 dot GA12359 at calimero dot vinschen dot de> <CANjopZG9AiJUJ-8ax5_T=_VFHqHLVSA=2cGwYEH2d10LqEc7Vg at mail dot gmail dot com> <20130308132937 dot GA15061 at calimero dot vinschen dot de> <5139F448 dot 4000808 at gmail dot com> <20130308143715 dot GD15061 at calimero dot vinschen dot de> <5139F946 dot 1050507 at gmail dot com> <20130308150855 dot GE15061 at calimero dot vinschen dot de>
- Reply-to: cygwin at cygwin dot com
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
> I think about it, but this will probably not make it into 1.7.18
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 Vinschen Please, send mails regarding Cygwin to
Cygwin Maintainer cygwin AT cygwin DOT com
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