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interacting with serial driver

Hello folks,

Can anyone please tell me how do i send chatacters over a serial line (say
ttyS0). I want to make use of the serial driver (serial.c) functions. But
the problem is, most of the functions are static. How do i interact with
the driver. (uh.. the driver is built with the kernel). Never done any
serious kernel hacking, but i think i'll need to generate some kind of
software interrupt, isn't it?

Any guiding link or pointer would be very helpful.

Using slack 7, 2.2.13k here.