/sys/class/net/eth?/carrier and uevents

/sys/class/net/eth?/carrier and uevents

[João Luis Meloni Assirati]

Hello,

I would like to have my network interfaces configured when plugged on the 
network cable. I know there are some daemons that do this for me (laptop-net, 
ifplugd, whereami), but it would be nice if a simple udev rule take care of 
this to me. However, as I can see with kernel 2.6.16 and udevmonitor (udev 
version 0.091), nonetheless /sys/class/net/eth?/carrier changes when I plug 
the network cable, no uevent is generated. Could this be changed so udev get 
triggered when network cables get plugged? As I am no kernel developper, this 
is only a suggestion, hoping that it would be a simple and pertinent job for 
those ho know the subject.

Thanks in advance,

João.

Re: /sys/class/net/eth?/carrier and uevents

[Jesper Juhl]

On 29/05/06, João Luis Meloni Assirati <assirati@nonada.if.usp.br> wrote:
>
> Hello,
>
Hi,

> I would like to have my network interfaces configured when plugged on the
> network cable. I know there are some daemons that do this for me (laptop-net,
> ifplugd, whereami), but it would be nice if a simple udev rule take care of
> this to me. However, as I can see with kernel 2.6.16 and udevmonitor (udev
> version 0.091), nonetheless /sys/class/net/eth?/carrier changes when I plug
> the network cable, no uevent is generated. Could this be changed so udev get
> triggered when network cables get plugged? As I am no kernel developper, this
> is only a suggestion, hoping that it would be a simple and pertinent job for
> those ho know the subject.
>

I added the 'carrier' attribute initially but never considered udev at
the time. But I can certainly see how it could be useful.
I'll take a look at adding a hotplug event when I get some spare time
(probably some time next week) - or perhaps someone else will beat me
to it :)

-- 
Jesper Juhl <jesper.juhl@gmail.com>
Don't top-post  http://www.catb.org/~esr/jargon/html/T/top-post.html
Plain text mails only, please      http://www.expita.com/nomime.html

Re: /sys/class/net/eth?/carrier and uevents

[Arjan van de Ven]

> 
> I added the 'carrier' attribute initially but never considered udev at
> the time. But I can certainly see how it could be useful.
> I'll take a look at adding a hotplug event when I get some spare time
> (probably some time next week) - or perhaps someone else will beat me
> to it :)

there is a netlink event already though... is this really worth the
duplication?

Re: /sys/class/net/eth?/carrier and uevents

[Jesper Juhl]

On 29/05/06, Arjan van de Ven <arjan@infradead.org> wrote:
>
> >
> > I added the 'carrier' attribute initially but never considered udev at
> > the time. But I can certainly see how it could be useful.
> > I'll take a look at adding a hotplug event when I get some spare time
> > (probably some time next week) - or perhaps someone else will beat me
> > to it :)
>
> there is a netlink event already though... is this really worth the
> duplication?
>

Dunno, perhaps not. Have not looked at it yet. If it's simple to add
and there won't be any confusion for userspace as to what event to
react to, then it might be a nice little thing to have.

-- 
Jesper Juhl <jesper.juhl@gmail.com>
Don't top-post  http://www.catb.org/~esr/jargon/html/T/top-post.html
Plain text mails only, please      http://www.expita.com/nomime.html

Re: /sys/class/net/eth?/carrier and uevents

[João Luis Meloni Assirati]

Em Seg 29 Mai 2006 18:33, Arjan van de Ven escreveu:
> > I added the 'carrier' attribute initially but never considered udev at
> > the time. But I can certainly see how it could be useful.
> > I'll take a look at adding a hotplug event when I get some spare time
> > (probably some time next week) - or perhaps someone else will beat me
> > to it :)
>
> there is a netlink event already though... is this really worth the
> duplication?

IMHO the ability to substitute a daemon with a simple udev rule, together with 
the benefit of notification by d-bus to the user interface (say KDE) makes it 
worth.

Regards,
João.