Detect pen drive

I need to detect when a pen drive (or more) is connected. I would prefer lo开发者_JAVA百科w-level ways, but also high-level ways are good. Development environment: C language on linux OS.

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udev - https://docs.google.com/viewer?url=http://www.kroah.com/linux/talks/ols_2003_udev_paper/Reprint-Kroah-Hartman-OLS2003.pdf

A quick tutorial on udev rules - http://www.reactivated.net/writing_udev_rules.html