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I need to serve keyboard interrupts in my application. I have done fair share of searching and I generally know how to register interrupt handler with kernel. But I don't know how to save/restore previous interrupt handler so when my application finishes computer remains usable. Also I need to have a function called on regular time intervals. I heard there is a kernel function for that but I don't know which one it is. Thank you in advance for any help.
Register an interrupt handler from a kernel module - that's doable, but from an user-space application? I rather does not work this way (of course, depending on the OS).
In general, you would need to store old handler address and then restore it later (if you know where to write the address, it should be rather easy).
I don't know what you're doing and what's the reason you need your own interrupt handler (what with different types of keyboards?), but it may be a much better idea to get raw access to keyboard from the application.