Linux最簡單內核模塊編寫

hello.h

/*
 * head file of hello.ko
 * location of following files : /usr/src/$(uname -r)/include/
 */
#include<linux/init.h> //module_init(),module_exit()
#include<linux/module.h> //MODULE_AUTHOR(),MODULE_LICENSE()
#include<linux/kernel.h> //KERN_EMERG

hello.c

/*
 * source file of hello.ko
 * location: /usr/src/$(uname -r)/driver/net/hello/
 */
#include "hello.h"  //find head file in current dir

/*
 * hello_init : initial function, called when module is installed
 * return 0 if succeeded
 */
static int hello_init(void)
{
  printk(KERN_EMERG"hello.ko is installed!\n");
  return 0;
}

/*
 * hello_exit : called when module is uninstalled
 */
static void hello_exit(void)
{
  printk(KERN_EMERG"hello.ko is uninstalled!\n");
}

module_init(hello_init);
module_exit(hello_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("zhangsk");

Makefile

obj-m := hello.o

all:

            make -C /lib/modules/$(shell uname -r)/build SUBDIRS=$(PWD) modules

clean:

            make -C /lib/modules/$(shell uname -r)/build SUBDIRS=$(PWD) clean

然後在當前文目錄中輸入： insmod hello.ko

OK, 可以看到屏幕中輸出： hello.ko is installed!