OHHH. I am with you now. I looked at driver_nl80211.c and somehow
had a blind spot when it came to message NLM_F_DUMP. I see it now,
and it's sending me back results.
I am tempted to write a slightly higher level API on top of some of
this, once I understand the semantics of all of this a little better.
I will search around first and see if any attempts have already been
made.
Thank you very much for pushing me in the right direction.
--Chris
On Mon, Aug 16, 2010 at 5:43 PM, Johannes Berg
<johannes@xxxxxxxxxxxxxxxx> wrote:
> On Mon, 2010-08-16 at 17:22 -0400, Christopher Piggott wrote:
>> It's hard to figure out what's going on sometimes. I set up an error handler:
>>
>> static int error_handler(struct sockaddr_nl *nla, struct nlmsgerr
>> *err, void *arg) {
>> printf("ERROR %s (%d)\n", strerror(err->error), err->error);
>> return NL_SKIP;
>> }
>>
>> which also returns -95 (operation not supported) just as you said.
>> So, I'll have to figure out what you mean by "dumping."
>>
>> I did find this:
>>
>> mcid = nl_get_multicast_id(state->nl_sock, "nl80211", "scan");
>>
>> in iw:event.c and traced it to some code in iw:genl.c, a file that
>> starts out by commenting "This ought to be provided by libnl". That
>> situation doesn't seem to have changed.
>>
>> Is this the area of the code you mean when you say "dump" ? That I
>> need to register myself to receive the scan results?
>
> No, you need to use NLM_F_DUMP etc. Really, check wpa_supplicant :)
>
> johannes
>
>
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