USB Device Dection?

["Soulivanh Anothay" <sanothay gmail com>]

Hello all,

I like to write a simple application that it shall scan all USB
devices that are currently attached to the computer.
My question is, does anyone know of any C function or a linux system
call which I can use for scanning for USB devices, and also report
back the types of those devices, ex. if it is a normal USB memory
stick, or a big 4 GB SD card,...?
Thanks in advance.
Soulivanh