On Fri, 2013-05-10 at 14:55 +0200, Lee Hambley wrote:

> int ret = ieee80211_radiotap_iterator_init(&rti, rth, rth->it_len);
> while(!ret) {
>   printf("Itteration: %d\n", count++);
>   ret = ieee80211_radiotap_iterator_next(&rti);

>

> There's limited scope for having screwed something up in that code, I
> think, I'm confused by the `1' being returned from
> `ieee80211_radiotap_iterator_init' which according to the
> implenentation doesn't seem like an error condition in the
> implementation http://lxr.free-electrons.com/source/net/wireless/radiotap.c#L95

I think you're confusing the userspace and Linux kernel implementation,
though they're very similar. In any case,
ieee80211_radiotap_iterator_next() cannot return 1, unless one of the
error values is defined to -1 (it returns -EINVAL and a few others)

johannes