My First Linux Module

My First Linux Module

Today, I successfully build my first Linux Hello module.

First of all add a directory named Hello in the Kernel/driver, and add a file hello.c, write codes like bellow:

#include <linux/init.h>#include<linux/module.h>Static int__init Hello_init (void) {PRINTK (Kern_err"Hello, world!\n."); return 0;}Static void__exit Hello_exit (void) {PRINTK (Kern_err"Goodbye, world!\n");} Module_init (Hello_init); Module_exit (Hello_exit); Module_author ("Bob, Zhang"); Module_license ("Dual BSD/GPL"); Module_description ("A Simple Hello World demo"); Module_alias ("A Simple Module");

Then create a Kconfig file:

config HELLO     " HELLO World driver! "     default M    help        HELLO World

and create a Makefile file:

Obj-m + = hello.o

Next ADD the Kconfig and Makefile into the Kconfig file and Makefile file in parent directory.

Finally Run the commands bellow:

 Make Arch=arm cross_compile=$tool _prefix my_kernel_defconfig make Arch=arm cross_compile=$tool _ Prefix modulesmkdir ./moduls_temp make arch=arm cross_compile= $tool _prefix Modules_ Install Install_mod_path=./modules_temp

At last, the demo run is like this:

My First Linux Module