getaddrinfo : Non-recoverable failure in name resolution

[Marco Atzeri]

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.
PostgreSQL 9.4 is still on Beta 1, so I am not in a hurry to release
a new version


> Thanks for the testcase.  Much appreciated,
> Corinna

Thanks for the solution
Marco

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