How to notify the GPIO state change in a C program?

Hi,

I found almost jetson GPIO program is based on python, is there any way to notify the GPIO state change in a C program rather than read the GPIO state all the time?
Thank you.

@ alanz @ JerryChang

please refer to Topic 144550, for several ways to access GPIOs. such as, kernel APIs, python scripts, C++ samples.

Thanks.

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