UID: 205836697

A Kernel Seedling

Kernel module that creates a file /proc/count which shows the current number of running processes.

Building

The Makefile contains instructions on how to build the kernel module. It specifies the source files, target name, and any necessary flags or dependencies.

Running

First run the make command to compile the kernel module. We expect to see:

make[1]: Entering directory '/usr/lib/modules/5.14.8-arch1-1/build' CC [M] /home/cs111/CS111_Lab0/proc_count.o MODPOST /home/cs111/CS111_Lab0/Module.symvers CC [M] /home/cs111/CS111_Lab0/proc_count.mod.o LD [M] /home/cs111/CS111_Lab0/proc_count.ko BTF [M] /home/cs111/CS111_Lab0/proc_count.ko make[1]: Leaving directory '/usr/lib/modules/5.14.8-arch1-1/build'

Then we load the module by using the command sudo insmod proc_count.ko. This command evokes the start initialize function proc_count_init(), shouldn't expect to see anything here.

We can get details of the running processes in /proc. To see the number of processes running at a time we will use the command cat /proc/count, count is specified as the proc_dir_entry. Should expect to see the number of running processes.

Cleaning Up

Explain how to remove your kernel module and clean up the code To remove the kernel module we use the command sudo rmmod proc_count. This command evokes the end cleanup function proc_count_exit(), shouldn't expect to see anything here. To clean up the code we run make clean, shouldn't expect to see anything here.

Testing

Tested using kernel release 5.14.8-arch1-1 and kernel version #1 SMP PREEMPT Sun, 26 Sep 2021 19:36:15 +0000