kernel level tty question

[Bernd Walter]

I noticed with a self build serial driver that I'm not allowed
to put data into a tty that is not opened.
I had to learn this the hard way and would like to know if there are
other points that I'm not aware of.
Is there any good documentation about kernel tty programming available?

-- 
B.Walter                   BWCT                http://www.bwct.de
ticso at bwct.de                                  info at bwct.de