SO_REUSEADDR and windows enhanced socket security
Corinna Vinschen
corinna-cygwin@cygwin.com
Tue Dec 15 17:11:00 GMT 2009
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
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Project Co-Leader cygwin AT cygwin DOT com
Red Hat
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