Kernel module for dummy dmesg

This is a kernel module for printing messages in kernel logs.

How to build

make -C /lib/modules/$(uname -r)/build M=$(pwd) modules

How to install the module to kernel and make a device file

sudo insmod dummy_dmesg.ko

then,

sudo mknod /dev/dummy_dmesg c <device major number> 0

Note that you can find device major number in dmesg after insmod like this:

$ sudo dmesg | grep major
[  264.832037] module loaded with device major number 235

How to print message visible from dmesg

sudo sh -c "echo \"dummy message, xid 13\" > /dev/dummy_dmesg"

You can find message like this:

$ sudo dmesg | grep xid
[ 1095.663854] dummy message, xid 13