glibc: inet6_rth_init returned an abnormal address?

[wangyufen]

On 2014/12/13 0:11, Ondřej Bílka wrote:
> On Fri, Dec 12, 2014 at 10:12:44AM +0800, wangyufen wrote:
>> On 2014/12/11 18:41, Ondřej Bílka wrote:
>>> On Thu, Dec 11, 2014 at 05:29:48PM +0800, wangyufen wrote:
>>>> Hi,
>>>>
>>>> I did some test on inet6_rth_init, inet6_rth_init returnned a invalid address;
>>>> But I used inet6_rth_init_ww (the same implementation as inet6_rth_init) in my test code, It returnned a valid address.
>>>> Dose anyone konw why?
>>>>
>>> Because you used implicit prototype. Compiler then assumes that prototype is
>>>
>>> int inet6_rth_init (void *bp, socklen_t bp_len, int type, int segments)
>>>
>>> and then sign-extends result, creating invalid pointer.
>>>
>>>
>> Thanks for your reply, then in order to obtain a valid address,  how to use inet6_rth_init?
>>
>>
> add
> 
> #include <netinet/in.h>
> 
It's already added, or the test code can't compiled.

I think it's not the reason of inet6_rth_init returned an invalid address.
 
>> thanks,
>> Wang
> 
> 
>