rtnl_link_delete returns 0 instead of -NLE_NODEV when a link cache is created

[Thomas Graf]

On 04/30/14 at 04:53pm, Thomas Haller wrote:
> If you change:
> 
>     atexit(cleanup);  
> 
> +   while (nl_cache_mngr_poll (mngr, 1000) > 0);
> 
>     /* delete another link which doesn't exist */
>     link_2 = rtnl_link_alloc();
> 
> then you get the NLE_NODEV.
> 
> But this is not the real fix. The solution is to leave the socket to the
> cache manager and create your own socket.

We should probably make this more obvious in the documentation
and maybe find a way to better abstract this in the code.