Messages in this thread | | | Date | Mon, 10 Jul 2006 07:31:27 +0800 | From | "Antonino A. Daplas" <> | Subject | Re: Opinions on removing /proc/tty? |
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Randy.Dunlap wrote: > On Sun, 9 Jul 2006 09:45:06 -0400 Jon Smirl wrote: > >> On 7/9/06, Antonino A. Daplas <adaplas@gmail.com> wrote: >>> Jon Smirl wrote: >>>> On 7/9/06, Randy.Dunlap <rdunlap@xenotime.net> wrote: >>>>> On Sat, 8 Jul 2006 01:56:02 -0400 Jon Smirl wrote: >>>>> >>>>>> On 7/8/06, Randy.Dunlap <rdunlap@xenotime.net> wrote: >>>>>>> I don't know how well this is an answer to your question, >>>>>>> but I would like to be able to find a list of registered "consoles," >>>>>>> whether they be serial, usbserial, netconsole, lp, or whatever. >>>>>>> /proc/tty/drivers does that partially. >>>>>> Console is an overloaded word. Do you want to know where it is legal >>>>>> to send system log output to, or do you want to know where you can log >>>>>> in from? There was a thread earlier that talked a little about >>>>>> controlling this. >>>>> I have a working definition: >>>>> I want to see a list of drivers that have called register_console(). >>>>> >>>>>>> I have a patch that also does it in /proc/consoles: >>>>>>> http://www.xenotime.net/linux/patches/consoles-list.patch >>>>>>> Is somewhere in /sys the right place to find a list of all consoles? >>>>>> /sys is the right place for this info but a class does not exist for >>>>> it yet. >>>>> >>>>> I want a list of registered consoles. How would I express that in /sys ? >>>> You could make the list appear as an attribute in >>>> /sys/class/tty/console. You will need to all a little sysfs code after >>>> the console tty device is created. >>>> >>> That would violate the one file, one value rule and GregKH will drop >>> it like a hot potato. >>> >>> A better solution is to have /sys/class/console. >> The one value rule is for things that can be changed.
No, it also applies to read-only attributes.
> For, example, I >> see no problem with using the graphics/modes attribute to see a list >> of legal modes, and then using graphics/mode to set or view the >> currently active mode.
Yes, a lot of the fbdev attributes violate this rule. There's some discussion in fbdev-devel list on how to overhaul this.
Why can't we have a read-only attribute that >> displays the list of available consoles? > > We should be able to do that somewhere/somehow, but /sys does > not allow for it in one file, like Tony said.
We can do it in debugfs, or do it like this in sysfs
/sys/class/console--- con0 : --- con1 : --- con2
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