events when (de)associating or when cable is (un)plugged

[Dirk-Willem van Gulik]

On Mar 27, 2004, at 12:17 AM, Suleiman Souhlal wrote:

>> Looking for suggestions on a 'clean' and generic way to allow for
>> notifications when a 802.11 association is made or lost, or when
>> a ethernet cable is (un)plugged. I.e.akin to the events 'usbd(8) get
>> when you sit on /dev/usb. This is for 5.2.1 or beyond.
>
> I am not too sure about 802.11, but to detect when the ethernet cable 
> is
> (un)plugged, you can use kqueue(2) with the EVFILT_NETDEV filter.

Ok - that looks like a good match -  so I guess it would make sense 
then to make
the #define of:

	#define ieee80211_new_state(_ic, _nstate, _arg) \
         		(((_ic)->ic_newstate)((_ic), (_nstate), (_arg)))

into something a bit more like a function:

	extern int ieee80211_new_state(struct ieee80211com *, enum 
ieee80211_state , int);

and then make the latter do something like

	void
	ieee80211_new_state(struct ieee80211com * ic, enum ieee80211_state 
nstate , int arg)
	{
         		/* Callback into the real driver */
        		int err =  (ic->ic_newstate)(ic, nstate, arg);
	#ifdef IEEE80211_DEBUG
		printf("Transition to state %x(%d) %s\n",nstate,arg, err ? "Failed" : 
"ok");
	#endif /* DEBUG */
		if (right args == some-assoc-change)
			KNOTE(ic->ifp->if_klist, arg ? NOTE_LINKDOWN : NOTE_LINKUP); /* ?? 
locking ?? */
	}

Thanks - hacking away.

Dw