#include#include #include #include static int sec = 5;module_param(sec,int,S_IRUGO|S_IWUSR);MODULE_PARM_DESC(sec,"set the interval.");static void mymod_timer(unsigned long data);static DEFINE_TIMER(timer,mymod_timer,0,0);static void mymod_timer(unsigned long data){ printk("mymod: timer \n"); mod_timer(&timer,jiffies + sec * HZ);}static int mymod_init(void){ printk("mymod: init \n"); if (sec <= 0) { printk(KERN_INFO,"Invalid interval sec = %d \n",sec); return -EINVAL; } mod_timer(&timer,jiffies + sec * HZ); return 0;}static void mymod_exit(void){ printk("mymod: exit\n"); del_timer(&timer);}module_init(mymod_init);module_exit(mymod_exit);MODULE_AUTHOR("db liu");MODULE_LICENSE("GPL");MODULE_DESCRIPTION("my first module");
源文件保存为：mymod.c
编写Makefile文件：
obj-m := mymod.oall: make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modulesclean: make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
安装模块
insmod mymod.ko
查看安装的模块
lsmod | grep mymod
检查安装模块是否安装成功
dmesg | tail
| mymod: init mymod: timer |
卸载模块
rmmod mymod
检查是否卸载成功
dmesg | tail
| mymod: exit |