libresolv with getaddrinfo

[Joshua Rogers <glibc at internot dot info>]

Hi everybody,

I'm trying to use libresolv in conjunction with getaddrinfo to resolve a
hostname with a custom NS server. I got it all worked and documented my
finding here:
http://blog.internot.info/2015/03/specifying-dnsns-server-for-address.html

However, one thing I found, was that on the first usage of
getaddrinfo(), the _res struct is overwritten.

So, in my code, I must do this, before I full in _res.nsaddr_list[0]:

>         getaddrinfo("google.com", NULL, &hints, &servinfo);
>         freeaddrinfo((struct addrinfo*)servinfo);


Is there a specific reason for this?
Is it a bug?


Any hints or info would be highly appreciated.


Thanks,
-- 
-- Joshua Rogers <https://internot.info/>

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