#include
#include
static int watchdog = 5000;
/* watdog默认值是5000, 但是可以通过 insmod hello.ko watchdog=1000设置非默认值 */
module_param(watchdog, int, 0644);
/* 对模块的参数进行描述 */
MODULE_PARM_DESC(watchdog, "transmit timeout in million seconds.");
static int hello_init(void)
{
printk(KERN_INFO " Hello World enter\n");
printk(KERN_INFO " watchdog->[%d]\n", watchdog);
return 0;
}
static void hello_exit(void)
{
printk(KERN_INFO " Hello World exit\n ");
}
module_init(hello_init);
module_exit(hello_exit);
MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("A simple Hello World Module");
MODULE_ALIAS("a simplest module");
查看模块输出:
tail -f /var/log/message:
Sep 13 17:22:54 bogon kernel: <6> Hello World enter
Sep 13 17:22:54 bogon kernel: watchdog->[1000]
查看模块信息:
[root@bogon hello]# rmmod hello.ko
[root@bogon hello]# insmod hello.ko watchdog=1000
[root@bogon hello]# modinfo hello.ko
filename: hello.ko
alias: a simplest module
description: A simple Hello World Module
license: Dual BSD/GPL
author: Barry Song <21cnbao@gmail.com>
srcversion: CA550DAF62F17A9B23FFCD6
depends:
vermagic: 2.6.18-194.el5 SMP mod_unload 686 REGPARM 4KSTACKS gcc-4.1
parm: watchdog:transmit timeout in million seconds. (int)
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