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Message-ID: | <4A82DDC1.6050800@dronecode.org.uk> |
Date: | Wed, 12 Aug 2009 16:20:33 +0100 |
From: | Jon TURNEY <jon DOT turney AT dronecode DOT org DOT uk> |
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To: | cygwin-xfree AT cygwin DOT com, cygwin AT cygwin DOT com |
Subject: | Re: [1.7] IPv6 accept() fails if address_len is < sizeof(sockaddr_in6) [was Re: PATCH /usr/include/X11/Xtrans/Xtranssock.c [WAS: Re: xhost package not compiled for IPv6]] |
References: | <4A78A511 DOT 8020109 AT sipxx DOT com> <4A803D7C DOT 6070800 AT dronecode DOT org DOT uk> <4A825EE5 DOT 5020709 AT sipxx DOT com> <4A82BB83 DOT 1090908 AT dronecode DOT org DOT uk> <4A82C835 DOT 9030504 AT dronecode DOT org DOT uk> <20090812135941 DOT GD13438 AT calimero DOT vinschen DOT de> |
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On 12/08/2009 14:59, Corinna Vinschen wrote: > On Aug 12 14:48, Jon TURNEY wrote: >> On 12/08/2009 13:54, Jon TURNEY wrote: >>> Hmmm... but if it's really the size of the sockname argument which is >>> causing the accept() to fail, this would be a bug in cygwin's accept() >>> implementation, as it's supposed to truncate the data written to the >>> sockname, rather than fail if it won't fit [1]. If that actually is the >>> case, since we don't actually use the peer address here, the code as >>> stands is correct (if a little odd). >>> >>> I suppose I need to write a small test case to look at this... >>> >>> [1] http://www.opengroup.org/onlinepubs/009695399/functions/accept.html >> >> A couple of small programs which hopefully demonstrate this problem. >> >> (As is, the connection fails, but uncommenting the alternate definition >> of cliaddr in listener.c allows it to work) >> >> I'd hazard a guess that perhaps this is because the underlying winsock >> accept() doesn't have this truncate behaviour and considers a too-small >> address_len an error. > > Thanks for the testcase! Oh, I meant to say "A couple of small programs shamelessly copied from UNIX Network Programming". So don't thank me, thank W. Richard Stevens :-) -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
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