linux-kernel - Re: tty: add 'active' sysfs attribute to tty0 and console device

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Message-ID: <AANLkTimV_zKK-Ubw3vJkDUtrYvB+W06cRR7Nz2vam6fP@mail.gmail.com>
Date:	Thu, 18 Nov 2010 00:40:16 +0100
From:	Kay Sievers <kay.sievers@...y.org>
To:	Valdis.Kletnieks@...edu
Cc:	Lennart Poettering <mzxreary@...inter.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Greg KH <greg@...ah.com>, Werner Fink <werner@...e.de>,
	Jiri Slaby <jslaby@...e.cz>
Subject: Re: tty: add 'active' sysfs attribute to tty0 and console device

On Wed, Nov 17, 2010 at 23:01,  <Valdis.Kletnieks@...edu> wrote:
> On Wed, 17 Nov 2010 00:10:24 +0100, Lennart Poettering said:
>
>> When two users A and B are logged in, on tty1 resp. tty2, then as long
>> as tty1 is active user A should get access to the sound card, usb key,
>> .... As soon as we switch to tty2 user B should.
>
> So I change to tty1, plug in my 8G USB memory stick, and I have access to it.
> I start copying something big to it, and change to tty2 to do something else
> while the long copy happens...
>
> ... and my copy craps out because tty1 lost access to the USB.
>
> Brilliant.

Brilliant conclusion. If you have mounted it, you own it. But you can
not make your inactive session mount another new one. It's like this
since ages. Hint: try stuff before hitting reply too fast. :)

Kay
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