capturing interrupts from other peripherals

I am developing a GUI application for my embedded system. I have attached a
keypad peripheral through RS232. I have a code to capture any interrupt
coming from that keypad. But how do I propogate the interrupt to gtk GUI? I
have been trying to use gtk_signal_emit., but I am facing some issues.

Is there any standard method to interface Input devices other than keyboard
and mouse, which gtk events can recognize?

Kindly throw some light on this as I am stuck on this badly.

Thanks in Advance.

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