/*
* 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 <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
MODULE_LICENSE ("GPL");
static int __init hello_2_init (void)
{
printk (KERN_INFO "Hello worldn");
return 0;
}
static void __exit hello_2_exit (void)
{
printk (KERN_INFO "Goodbye worldn");
}
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。