thermalx

Hi , there I am trying to write a program which will detect the presence of SD Card in Nano Pi M1 plus device. There are many ways to do this either by doing fdisk -l or looking into /dev/mmcblk* . But I want to keep running it in a loop and doing fdisk -l and grep doesn't seems an appropriate way. Can the insertion or removal of SD cards be checked via Hardware Interrupts? Plz. help me I am a newbie. Thank in advance.