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

From: Dirk-Willem van Gulik (dirkx_at_webweaving.org)
Date: 03/27/04

  • Next message: Dirk-Willem van Gulik: "Re: events when (de)associating or when cable is (un)plugged" 
    Date: Sat, 27 Mar 2004 01:39:33 +0100
To: Suleiman Souhlal <refugee@segfaulted.com>

    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

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