lkm-counter

Linux Kernel Module which counts number of device reads. Inspired by chardev.c from The Linux Kernel Module Programming Guide.

Usage Example

$ sudo insmod counter.ko
$ sudo dmesg | tail -3
[19953.856863] In the beginning...
[19953.856870] Counter assigned major number 510.
[19953.856998] Device created on /dev/jimbob_counter
$ sudo cat /dev/jimbob_counter
I have been read 1 times.
$ sudo cat /dev/jimbob_counter
I have been read 2 times.
$ sudo cat /dev/jimbob_counter
I have been read 3 times.
$ sudo dmesg | tail -3
[19989.878026] I have been read 1 times.
[20031.240523] I have been read 2 times.
[20031.813530] I have been read 3 times.

Development

Building

make

Loading

sudo insmod counter.ko

Unloading

sudo rmmod counter.ko