linux-kernel - Re: [QUERY] User-Mode Linux and /dev/tty*

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Date:	Tue, 16 Jul 2013 17:59:07 +0200
From:	Richard Weinberger <richard@....at>
To:	Ramkumar Ramachandra <artagnon@...il.com>
CC:	LKML <linux-kernel@...r.kernel.org>, Jeff Dike <jdike@...toit.com>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [QUERY] User-Mode Linux and /dev/tty*

Hi!

Am 16.07.2013 17:54, schrieb Ramkumar Ramachandra:
> Hi,
> 
> So, I was trying to boot User-Mode Linux with a modern rootfs with
> systemd on it, and found that it wouldn't present me a prompt.  I dug
> further, and found out that getty is not able to open /dev/tty1; I
> then tried the console-getty.service (which uses /dev/console), and it
> worked.  The reason it doesn't work out of the box is that systemd is
> not able to figure out whether or not a virtual console subsystem is
> present: /dev/tty0 is present for some reason (although I'm not sure
> it's a virtual console), and this confuses systemd.
> 
> So, my question is: does um Linux have a virtual console subsystem?
> If so, then why doesn't it seem to work?  If not, why does /dev/tty0
> exist?

UML does not have CONFIG_VT.
But recent systemd versions can deal with that.

Thanks,
//richard

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