How to print linux kernel version number in kernel module - linux-kernel

Question

I'm a noob to linux kernel programming and thought I'd be able to find the answer for this (since it seems really simple) but haven't had any luck yet. I need to make a linux kernel module that prints the version number of the kernel. The assignment requires that implement a module which displays this kind of message when loaded:
"Hello Master. You are currently using Linux (version)", where (version) is the kernel version no.
How can I do this? I tried using uname (http://man7.org/linux/man-pages/man2/uname.2.html) but when I include sys/utsname.h, I get a fatal error upon compiling with my makefile
"Cannot open include file: 'sys/utsname.h': No such file or directory".
Here is my module
#undef __KERNEL__
#define __KERNEL__
#undef __MODULE__
#define __MODULE__
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <sys/utsname.h>
struct utsname unameData;
static int __init config_init(void)
{
uname(&unameData);
printk(KERN_INFO "Version number is %s\n", unameData.version);
return 0;
}
static void __exit config_exit(void)
{
printk(KERN_INFO "config_exit executed with success\n");
return;
}
module_init(config_init);
module_exit(config_exit);
MODULE_LICENSE("GPL");
Makefile
obj-m := config.o
KDIR := /lib/modules/$(shell uname -r)/build
PWD := $(shell pwd)
all:
$(MAKE) -C $(KDIR) M=$(PWD) modules
clean:
$(MAKE) -C $(KDIR) M=$(PWD) clean

Answer 1

Firstly, you need to use the correct headers and also the correct function utsname(). Following code work well for me.
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/utsname.h>
static int __init my_init(void)
{
printk(KERN_INFO "Kernel version %s\n", utsname()->version);
printk(KERN_INFO "Kernel release %s\n", utsname()->release);
return 0;
}
static void __exit my_exit(void)
{
printk(KERN_INFO "exit module");
return;
}
module_init(my_init);
module_exit(my_exit);
MODULE_LICENSE("GPL");
dmesg output should looks something like this:
[ 1117.358451] Kernel version #64-Ubuntu SMP Mon Sep 22 21:28:38 UTC 2014
[ 1117.358457] Kernel release 3.13.0-37-generic