netdev - Re: tun: add tun_flags, owner, group attributes in sysfs

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Message-Id: <1241449085.6126.117.camel@macbook.infradead.org>
Date:	Mon, 04 May 2009 15:58:05 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	netdev@...r.kernel.org, Mark McLoughlin <markmc@...hat.com>
Subject: Re: tun: add tun_flags, owner, group attributes in sysfs

On Mon, 2009-05-04 at 07:47 -0700, Stephen Hemminger wrote:
> Netlink please not sysfs. 

That seems like overkill in this case.

> also, any sysfs attributes have to handle unregistration issues.
>       ( sleep 900; read owner ) </sys/class/net/tun0/owner &
>       rmmod tun

That gets handled for you automatically...

[root@...ersburg ~]# ( sleep 900 ; read owner; echo $owner ) < /sys/class/net/tun0/owner &
[1] 4728
[root@...ersburg ~]# ./ip tuntap del tun0 mode tun
[root@...ersburg ~]# rmmod tun
[root@...ersburg ~]# killall sleep
-bash: line 28:  4729 Terminated              sleep 900
[root@...ersburg ~]# -bash: line 28: read: read error: 0: No such device

-- 
dwmw2

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