From: Coywolf Qi Hunt <coywolf@gmail.com>
To: linux-kernel@vger.kernel.org
Subject: Re: Detecting link up
Date: Wed, 18 May 2005 23:06:32 +0800 [thread overview]
Message-ID: <2cd57c900505180806669beab@mail.gmail.com> (raw)
In-Reply-To: <20050518143712.GA21883@roonstrasse.net>
On 5/18/05, Max Kellermann <max@duempel.org> wrote:
> On 2005/05/18 13:40, Martin Zwickel <martin.zwickel@technotrend.de> wrote:
> > On Wed, 18 May 2005 11:35:12 +0100
> > Filipe Abrantes <fla@inescporto.pt> bubbled:
> > > I need to detect when an interface (wired ethernet) has link up/down.
> > > Is there a system signal which is sent when this happens? What is the
> > > best way to this programatically?
> >
> > mii-tool?
>
> A thought on a related topic:
>
> When a NIC driver knows that there is no link, why does it even try to
> transmit a packet? It could return immediately with an error code,
> without applications having to wait for a timeout.
>
> (I had a quick peek at two drivers, and they don't check the link
> status)
An NIC driver doesn't know if there's other links or not. One NIC
driver is for one type of NIC. And there's also interface lo.
--
Coywolf Qi Hunt
http://sosdg.org/~coywolf/
next prev parent reply other threads:[~2005-05-18 15:10 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-18 10:35 Detecting link up Filipe Abrantes
2005-05-18 11:40 ` Martin Zwickel
2005-05-18 13:11 ` Vaibhav Nivargi
2005-05-18 13:57 ` Richard B. Johnson
2005-05-18 14:37 ` Max Kellermann
2005-05-18 15:00 ` Oliver Neukum
2005-05-18 15:06 ` Coywolf Qi Hunt [this message]
2005-05-18 15:11 ` Richard B. Johnson
2005-05-18 17:33 ` Michael Tokarev
2005-05-18 18:20 ` Stephen Hemminger
2005-05-18 22:20 ` Baruch Even
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