前面介绍了如何进行模块化编程，下面我写一写模块化编程的拓展，在上一个教程的基础上，加入module_init、module_exit的支持，加载模块，观察结果。

/*
* hello.c
*
* Simple hello world 2.6 driver module with module_init, module_exit
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.

* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.

* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/

#include
#include
#include

MODULE_LICENSE ("GPL");

static int __init hello_2_init (void)
{
printk (KERN_INFO "Hello world\n");
return 0;
}

static void __exit hello_2_exit (void)
{
printk (KERN_INFO "Goodbye world\n");
}

module_init (hello_2_init);
module_exit (hello_2_exit);

然后：

$ su root

$ cp ex2-init-exit /home/linux/test –a

2、$ cd /home/linux/test/ex2-init-exit

3、$ make

4、通过insmod命令将模块加入内核

$ insmod insmod hello.ko

5、通过lsmod查看内核模块

$ lsmod | grep hello

6、通过rmmod删除内核中的模块

$ rmmod hello

7、查看源码，适当修改

模块化编程的好处我就不再赘述，非常好的思想。