linux-kernel - /sys/class/tty/tty0/active?

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Date:	Thu, 26 Jan 2012 22:52:05 +0100
From:	richard -rw- weinberger <richard.weinberger@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Greg KH <gregkh@...e.de>, Linux-Arch <linux-arch@...r.kernel.org>,
	user-mode-linux-devel@...ts.sourceforge.net
Subject: /sys/class/tty/tty0/active?

Hi!

systemd goes nuts on UML.
While hunting down all issues I found out that systemd wants to read from
/sys/class/tty/tty0/active.

On UML this directory does not have this "active" file.
[1] indicates that it has something to do with /dev/tty0.
Of course, UML has a /dev/tty0, it's the default console.

But where comes "active" from?
Is there any black magic hidden register API to get this file? ;-)

[1]
http://lists.freedesktop.org/archives/systemd-devel/2011-December/004096.html

-- 
Thanks,
//richard
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