Re: Design for setting video modes, ownership of sysfs attributes

[Vladimir Dergachev <volodya@mindspring.com>]

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.

                          best

                            Vladimir Dergachev

>
>
> On Sat, 18 Sep 2004 16:33:54 -0700, Keith Packard <keithp@keithp.com> wrote:
>>
>> Around 18 o'clock on Sep 18, Jon Smirl wrote:
>>
>>> The sysfs scheme has the advantage that there is no special user
>>> command required. You just use echo or cp to set the mode.
>>
>> But it makes it difficult to associate the sysfs entry with the particular
>> session.  Seems like permitting multiple opens of /dev/fb0 with mode
>> setting done on that file pointer will be easier to keep straight
>>
>>
>>
>>
>
>
>
> -- 
> Jon Smirl
> jonsmirl@gmail.com
>
>
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