This kernel module parses a binary string to integer and reverses the bits of the string.
On a linux machine with the correct build tools and linux header files, run make to build the module.
Then, run sudo insmod reverse.ko.
After the module is loaded, check the logs with dmesg to get the major number. Then, create the interface file with sudo mknod /dev/reverse MAJOR_NUBMER 0, where MAJOR_NUMBER was the number from the logs previously.
To remove the module, run sudo rmmod reverse.ko
To use the function of the module, write some valid data to the /dev/reverse file. Valid data may only contain the characters 0, 1, and \n.
The reversed output of the module will be available in the dmesg logs.
As it currently stands, this is not a very useful kernel module. Some easy future improvements:
- Return the last reversed integer during a read to the file, such as
cat /dev/reverse - Automatically create or close the interface file when the module is loaded or removed
- Improve the string to integer parsing. Allow for different integer formats (decimal, hexadecimal, octal, binary)