linux-kernel - Re: [PATCH, RFC, BAD IDEA] /proc/tty/console

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Date:	Wed, 27 Feb 2008 13:52:25 -0500
From:	Bill Nottingham <notting@...hat.com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH, RFC, BAD IDEA] /proc/tty/console

Randy Dunlap (randy.dunlap@...cle.com) said: 
> > I'm not seriously proposing this. But, as far as I can tell, this
> > information isn't exposed to userspace anywhere, and it's a useful
> > thing to know. I'm certainly open for better ideas on how to expose
> > this (sysfs attributes? other?)
> > 
> > ....
> > 
> > The attached patch adds /proc/tty/console. The contents of it are
> > simply a description of the current drivers attached to /dev/console.
> > For example, a boot with 'console=ttyS3,115200n1 console=tty0' would
> > yield:
> > 
> > # cat /proc/tty/console
> > unknown             /dev/tty0
> > serial              /dev/ttyS3
> > 
> 
> So it omits other consoles (non-tty) intentionally?
> or does it include them even though the procfs filename contains "tty"?

It only does consoles that have a tty_driver, as those are the ones I'd
find most interesting.

> Anyway, I'd like to see something like this.
> Compare http://www.xenotime.net/linux/patches/consoles-list.patch
> (April-2006).

Reading that, unless I'm missing something, you'd lose the device name
distinction (i.e., *which* serial port).

Bill
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