The only thing you need to add is VT_GETACTIVE, which is fine providing you know how to use it, but in both cases it is basically useless because by the time you've asked the question the answer is undefined. You can only use an interface of this type if you lock against VT changes, which is how the X interface works if you look at it.

So what are you going to do with the return value from an interface which provide "what was the console, perhaps, at some point you asked but could even have been deleted, assigned to a different user, hot unplugged or moved to another framebuffer device by the time I answer"

What is it for ???