LingBo Tang wrote:
> - current VT usage model is not match with devname as other cases,
>   like pts and clearview;
> - manage active link as symlink in devname filesystem requests expand
>   current devname.
> - VT daemon can update the contents of "active link" by two syscalls,
>   which only have a very small time window for potential incorrect
>   plug-in device accessing.

very small ?

No window of incorrectness is acceptable, since a race condition like 
this could lead to possible incorrect permissions and this security 

It MUST always be correct, if you can't make it always correct don't do it.

Darren J Moffat

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