From Operating System Concepts By Gagne, Galvin, Silberschatz. 10th edition Chapter 2 Project, implementation has to be in C:

This assignment will involve designing two kernel modules:

1. Design a kernel module that creates a /proc file named /proc/jiffies that reports the current value of jiffies when the /proc/jiffies file is read, such as with the command cat /proc/jiffies. Be sure to remove /proc/jiffies when the module is removed.

2. Design a kernel module that creates a proc file named /proc/seconds that reports the number of elapsed seconds since the kernel module was loaded. This will involve using the value of jiffies as well as the HZ rate. When a user enters the command cat /proc/seconds your kernel module will report the number of seconds that have elapsed since the kernel module was first loaded. Be sure to remove /proc/seconds when the module is removed.