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]]

[Jon TURNEY <jon dot turney at dronecode dot org dot uk>]

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 :-)


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