Re: getaddrinfo : Non-recoverable failure in name resolution

[Corinna Vinschen <corinna-cygwin at cygwin dot com>]

On Jun 23 15:07, Marco Atzeri wrote:
> 
> On 23/06/2014 14:25, Corinna Vinschen wrote:
> >Hi Marco,
> >
> >On Jun 23 13:41, Marco Atzeri wrote:
> 
> >>
> >>64 $ ./getaddrinfo_test-2_64
> >>getaddrinfo: Non-recoverable failure in name resolution
> >>
> >>
> >>Am I missing something ?
> >>The second way is currently used on postgresql in several places,
> >>but it seems to fail only for "127.0.0.1"
> >
> >I don't know why this only fails for "127.0.0.1".  But this is clearly a
> >problem in the 64 bit Cygwin DLL.
> >
> >What happens is that the field ai_addrlen is defined as socklen_t in
> >POSIX, but as size_t in the W32 API.  On 64 bit, socklen_t is 4 bytes
> >while size_t is 8 bytes.  Setting all the hintp members manually (in
> >contrast to calloc'ing it or memset'ing it to 0) leaves the 4 upper
> >bytes of the ai_addrlen untouched.  This in turn leads to a high
> >probability that ai_addrlen has an invalid value when entering Winsock's
> >getsockopt.
> >
> >I'm really surprised this hasn't been hit before.  I'm going to fix that
> >in Cygwin by setting the upper 4 bytes of ai_addrlen to 0 explicitely.
> 
> Probably we have seen already but not identified.
> 
> >For the time being, you might prepend
> >
> >   memset (&hintp, 0, sizeof hintp);
> >
> >to the code, prior to setting the elements manually.
> 
> I will wait next snapshot.

Generated.


Thanks,
Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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