From owner-freebsd-hackers@FreeBSD.ORG  Fri Mar 26 16:39:41 2004
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id EF3DF16A4CE
	for <freebsd-hackers@freebsd.org>;
	Fri, 26 Mar 2004 16:39:41 -0800 (PST)
Received: from skutsje.san.webweaving.org (skutsje.san.webweaving.org
	[209.132.96.45])
	by mx1.FreeBSD.org (Postfix) with ESMTP id C277443D39
	for <freebsd-hackers@freebsd.org>;
	Fri, 26 Mar 2004 16:39:39 -0800 (PST)
	(envelope-from dirkx@webweaving.org)
Received: from [10.11.0.203] (fia193-115-100.dsl.hccnet.nl [80.100.115.193])
	(authenticated bits=0)i2R0XLEJ061588
	(version=TLSv1/SSLv3 cipher=RC4-SHA bits=128 verify=NO);
	Fri, 26 Mar 2004 16:33:25 -0800 (PST)
	(envelope-from dirkx@webweaving.org)
In-Reply-To: <20040326181713.32971952@zZzZ.segfaulted.com>
References: <39FE23FA-7F75-11D8-8F99-000A95CDA38A@webweaving.org>
	<20040326181713.32971952@zZzZ.segfaulted.com>
Mime-Version: 1.0 (Apple Message framework v613)
Content-Type: text/plain; charset=US-ASCII; format=flowed
Message-Id: <37AF87AA-7F87-11D8-8F99-000A95CDA38A@webweaving.org>
Content-Transfer-Encoding: 7bit
From: Dirk-Willem van Gulik <dirkx@webweaving.org>
Date: Sat, 27 Mar 2004 01:39:33 +0100
To: Suleiman Souhlal <refugee@segfaulted.com>
X-Mailer: Apple Mail (2.613)
cc: freebsd-hackers@freebsd.org
Subject: Re: events when (de)associating or when cable is (un)plugged
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 27 Mar 2004 00:39:42 -0000


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