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Date: Fri, 18 Dec 2009 09:58:21 +0300
From: yesin <v DOT yesin AT gmail DOT com>
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To: cygwin AT cygwin DOT com
Subject: Re: SO_REUSEADDR and windows enhanced socket security
References: <4B27AFEB DOT 4030609 AT gmail DOT com> <20091215171051 DOT GH8059 AT calimero DOT vinschen DOT de>
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Corinna! Thanks!
Can you shedule a build for cygwin.dll with changes included in CVS?
I promise to test it!

Thanks again,Vladimir Yesin.

Corinna Vinschen ?????:
> On Dec 15 18:48, yesin wrote:
>   
>> looks like a problem with SO_REUSEADDR exists in CYGWIN for all
>> windows with support for "Enhanced socket security" (see
>> http://msdn.microsoft.com/en-us/library/ms740621(VS.85).aspx <http://www.google.com/url?sa=D&q=http://msdn.microsoft.com/en-us/library/ms740621%28VS.85%29.aspx&usg=AFQjCNF9bXOmPTwYjiP37Xdq2xRAYNXfWg>)
>>
>>
>> i'am trying to start multimple simultaneous UDP listeners for a
>> multicast packets on a single machine (reuse same address and port
>> with SO_REUSEADDR)
>> [...]
>> with cygwin environment i can't run multiple listerers... bind error:
>> Address already in use!
>>     
>
> Thanks for the report and especially thanks for the testcase.  There
> is code in Cygwin which skips calls to setsockopt(SO_REUSEADDR) on
> systems supporting enhanced socket security.  That's necessary to
> emulate socket re-binding behaviour more closely to POSIX behaviour.
> The problem was that this should have been only called for TCP sockets
> but Cygwin accidentally called it for UDP sockets as well.  I fixed
> that in CVS.
>
>
> Thanks again,
> Corinna
>
>   


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