This is the mail archive of the
mailing list for the Cygwin project.
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]]
- From: Corinna Vinschen <corinna-cygwin at cygwin dot com>
- To: cygwin-xfree at cygwin dot com, cygwin at cygwin dot com
- Date: Wed, 12 Aug 2009 15:59:41 +0200
- 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.email@example.com> <4A803D7C.firstname.lastname@example.org> <4A825EE5.email@example.com> <4A82BB83.firstname.lastname@example.org> <4A82C835.email@example.com>
- Reply-to: cygwin-xfree at cygwin dot com
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 . 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...
>>  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! This confirms what I wrote about WinSock in
Now for the patch to workaround that problem...
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Project Co-Leader cygwin AT cygwin DOT com
Problem reports: http://cygwin.com/problems.html
Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple