Message-ID: <20040919101139.98941.qmail@web11906.mail.yahoo.com>
Date: Sun, 19 Sep 2004 03:11:39 -0700 (PDT)
From: Mike Mestnik <cheako911@yahoo.com>
Subject: Re: Design for setting video modes, ownership of sysfs attributes
To: Jon Smirl <jonsmirl@gmail.com>,
       Vladimir Dergachev <volodya@mindspring.com>
Cc: Keith Packard <keithp@keithp.com>, Mike Mestnik <cheako911@yahoo.com>,
       dri-devel <dri-devel@lists.sourceforge.net>,
       lkml <linux-kernel@vger.kernel.org>
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--- Jon Smirl <jonsmirl@gmail.com> wrote:

> You did that from an xterm, right? Which console device is the xterm
> running on?
> 
> X starts up a process that knows which device it is running and it can
> remember that device since X stays running.
> 
Remember X opens the VC sepratly from it's console, hence it workes even
when run from a serial or ssh terminal.

> Maybe the answer is that this is something for the VC layer since the
> VC layer stays running and knows what device it was started on. An
> escape sequence could query the device from the VC terminal emulator.
> 
> Is there some way to figure this out from the environment? 
> 
> On Sat, 18 Sep 2004 21:57:32 -0400 (EDT), Vladimir Dergachev
> <volodya@mindspring.com> wrote:
> > On Sat, 18 Sep 2004, Jon Smirl wrote:
> > > Isn't there an enviroment variable that tells what device is the
> > > console for the session? How do you tell what serial port you're on
> > > when multiple people are logged in on serial lines?
> > 
> > From any program you can do this:
> > 
> > volodya@silver:~$ ls -l /proc/self/fd/0
> > lrwx------  1 volodya users 64 Sep 18 21:56 /proc/self/fd/0 ->
> /dev/pts/1
> > 
> > So you get the pointer to the actual device stdin is associated to.
> 
> -- 
> Jon Smirl
> jonsmirl@gmail.com
> 


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