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

[Alan Cox]

> is the most pressing case e.g. on s390 or zSeries) and this without
> forcing (and maybe stealing) the controlling tty on the system console
> to be able to detect the primary tty/console.

What do you mean by console in this context

The console in printk context and the "console" in "active vt window" are
unrelated concepts with the same name, so its a bit confusing to follow
here.

> facilities (having device, read, write, and unblank) are also shown
> in the new file /sys/class/tty/console/active ... but maybe Randy
> could says a few words for what this is usable.

The system console does not even need to be a tty device, and on many
embedded devices is not (it may for example by a RAM buffer not wiped
over reboots or it may be jtag or MIPI trace ports.

"tty0" is *currently* a shorthand for "the VT the keyboard/display are
showing". That's a shorthand that in itself will make no sense in future.

Alan
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