How to avoid data copies in a driver ?

Hello,

I'd like to optimize my driver, which receives data through a fifo and gives
them to a user space application. In turns this application moves this data
into a file.

To avoid several useless copies, I'd like the application to pass to the driver
a file descriptor (?) to the driver and then the driver can directly move the
received data to that file.

Could anybody give me some example of such scheme ?

Thanks,
--
Francis
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