Makefile to build the Modules in GCC using Hello world C programming

Telugu machu Fun
Sample C programe file can be used :

Hello.c


#include <linux/kernel.h>
#include <linux/module.h>


static int __init hello_init(void)
{
        printk("The LDD\n");
        printk(KERN_ALERT "Hello world\n ");
        return 0;
}

static void __exit hello_exit(void)
{
        printk("Bye LDD\n");
        printk(KERN_ALERT "Good bye\n");
}

module_init(hello_init);
module_exit(hello_exit);

MODULE_DESCRIPTION("example: Hello LDD");
MODULE_LICENSE("Dual  BSD/GPL");

Sample Makefile file can be used :
bash-3.2# cat Makefile
obj-m := hello.o

KDIR := /lib/modules/$(shell uname -r)/build
PWD := $(shell pwd)

default:
        $(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules

clean:
        rm -rf *.ko *.mod.* .*.cmd *.o .tmp* modules.order Module.symvers

next "make"  command helps to build sample 

Lod the module into kernel :
   /sbin/insmod   hello.ko
logs help to verifies modules are loaded :
  tail /var/log/messages
Virtual file Live details:
  cat /proc/modules

 

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