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

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Message-ID: <20101118112335.434de53a@lxorguk.ukuu.org.uk>
Date:	Thu, 18 Nov 2010 11:23:35 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"Dr. Werner Fink" <werner@...e.de>
Cc:	Greg KH <greg@...ah.com>,
	Lennart Poettering <mzxreary@...inter.de>,
	Kay Sievers <kay.sievers@...y.org>, Valdis.Kletnieks@...edu,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Randy Dunlap <rdunlap@...otime.net>,
	Jiri Slaby <jslaby@...e.cz>
Subject: Re: tty: add 'active' sysfs attribute to tty0 and console device

> is the most pressing case e.g. on s390 or zSeries) and this without
> forcing (and maybe stealing) the controlling tty on the system console
> to be able to detect the primary tty/console.

What do you mean by console in this context

The console in printk context and the "console" in "active vt window" are
unrelated concepts with the same name, so its a bit confusing to follow
here.

> facilities (having device, read, write, and unblank) are also shown
> in the new file /sys/class/tty/console/active ... but maybe Randy
> could says a few words for what this is usable.

The system console does not even need to be a tty device, and on many
embedded devices is not (it may for example by a RAM buffer not wiped
over reboots or it may be jtag or MIPI trace ports.

"tty0" is *currently* a shorthand for "the VT the keyboard/display are
showing". That's a shorthand that in itself will make no sense in future.

Alan
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