Problem with the serial interface

[TrS]

Hello advanced Linux programmers,

I need a little support.
Because of the needs of a special project, I want to disable the hardware FIFO buffers of the serial interfaces of my target. The result I expect is generation of SIGIO signal on each receved byte. I can not find any possibility to do this. Please, help me if you can...
Thank you in advance!

TrS

[burnit]

googling on that, I've fuond this resource:

http://www.beyondlogic.org/serial/serial1.htm

It talks about activation about FIFO buffers and interrupt driver I/O... maybe it can help you.

[TrS]

Thank you Burnit,

This information is really useful if I change the driver of the serial interface, but I prefer to solve my problem from the user level. In any case thank you for the answer.
By the way I will try to ask a more common question. How to control the drivers in RS485 mode (via RTS) signal? This is my main aim. The problem is to find out the exact time when I have to disable the drivers (to clear RTS signal).
This theme is discussed very often on many places, but up to now I can not see a clear answer how it can be done without change of the serial driver. Is it really possible?