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

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Message-ID: <20101118125822.16718289@lxorguk.ukuu.org.uk>
Date:	Thu, 18 Nov 2010 12:58:22 +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

> Example: running a boot script on /dev/console and after fsck
> sulogin has to called to be able to asked the system admin.
> Now the question is which console device the system admin is
> waiting in front of (before /dev/ttyS0 or /dev/tty3270 or whatever).

Ok that is a rather nebulous concept for embedded. The answer probably
being that the true console device has no input facility.

> I'm aware of.  For using tty devices of the system console it requires
> to have e.g. with my patch:
> 
>   bash> cat /proc/tty/consoles 
>   tty0                 -WU (ECp)       4:7
> 
> the `W' flag for write and the major:minor pair, beside this the `U'
> flag indicates the tty can do an unblank operation, the `-' shows that
> there is no read operation (never seen such a console tty).  On an other

Try the lp printer console if you want a test case

> to detect the primary console device here.

Why not just open /dev/console ?

Alan

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