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From: "PAULUS, Raimund, TI-ABN" <Raimund DOT Paulus AT dillinger DOT biz>
To: "'cygwin AT cygwin DOT com'" <cygwin AT cygwin DOT com>
Subject: Re: RPC clnt_create() adress already in use
Date: Tue, 27 Feb 2018 09:54:03 +0000
Message-ID: <59D90AF8D70E9740907BACDE2BCB520836F2555E@RESW102.resdom01.local>
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High Corinna,

is it possible to get the patched cygwin1.dll for Cygwin 2.5.1? I have to support several older Win XP SP3 boxes.

Raimund

-----Ursprüngliche Nachricht-----
Von: cygwin-owner AT cygwin DOT com [mailto:cygwin-owner AT cygwin DOT com] Im Auftrag von Corinna Vinschen
Gesendet: Dienstag, 6. Februar 2018 15:20
An: cygwin AT cygwin DOT com
Betreff: Re: RPC clnt_create() adress already in use

On Feb  6 11:29, PAULUS, Raimund, TI-ABN wrote:
> On Feb  5 15:06, Corinna Vinschen wrote:
> > On Feb  5 14:34, Corinna Vinschen wrote:
> > > On Feb  5 12:26, Corinna Vinschen wrote:
> > > > [...]
> > > > What potential solutions to this problem do we have?
> > > > 
> > > > - bindresvport could enforce SO_EXCLUSIVEADDRUSE temporarily to make
> > > >   sure bind fails.
> > > 
> > > Nope, no way.  Even enforcing SO_EXCLUSIVEADDRUSE results in the 
> > > second bind succeeding and the subsequent connect failing.  The 
> > > entire SO_REUSEADDR/SO_EXCLUSIVEADDRUSE semantics only works as 
> > > desired on the server side apparently
> > > 
> > > > - bindresvport could check every local address for being free prior
> > > >   to calling bind.  However, there's a potential race here.
> > > > 
> > > > - DisconnectEx?  Never tried this Winsock extension but it might be
> > > >   worth a shot.
> > 
> > I think I have a very simple solution for the scenario which calls 
> > bindresvport with port number.  Still looking for a solution for the 
> > second problem...
> 
> I've pushed a few patches and uploaded new developer snapshots to 
> https://cygwin.com/snapshots.  Please give them a try.
> 
> with the snapshot of cygwin1.dll and using bindresvport() from Cygwin 
> for libtirpc (instead of the original bindresvport() from libtirpc) 
> all my testcases work without error.
> 
> Many thanks
> Raimund

Thanks for testing.  Please note that this should work most of the time, but is still not 100% foolproof.  There's a systematic race between checking existing connections and calling bind which can't be easily worked around by Cygwin.  Still, should be better than before :}


Corinna

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

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