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termios/tty/ info? help?

Hi all,
Could someone please point me to some info on userspace reading and writing to char device? I'm looking for any information that would help me clear a few things up. Somehow I think my understanding of termios/ioctl is screwed up and I would like to get it.
It's hard to describe what I'm missing or I'll give a it more info. I'm lookinf for stuff like tty buffer size, tty interrupt handling, tty read/write etc. Does interrupt occurs on buffer full or when a char is received?
I'm under linux 2.6.

Thanks ver much.

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