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linux char device driver programming

1. type 'make' to make your module 'my_devfs'.
2. use 'load_my_devfs' to load this module into your system.
3. execute 'py_test.py' to exam the module's write operation.
4. type 'dmesg' to see if the device correctly print the number from you.
5. to unload the module, use 'unload_my_devfs'.