68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
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/*
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* hello-5.c - 演示传递给模块的命令行参数
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*/
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#include <linux/init.h>
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#include <linux/kernel.h> /* 引入 ARRAY_SIZE() */
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/printk.h>
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#include <linux/stat.h>
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MODULE_LICENSE("GPL");
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static short int myshort = 1;
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static int myint = 420;
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static long int mylong = 9999;
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static char *mystring = "寻觅";
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static int myintarray[2] = { 420, 420 };
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static int arr_argc = 0;
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/* module_param(foo, int, 0000)
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* foo: 传入参数的名称
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* int: 参数的数据类型
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* 0000: 权限位, 用于在稍后阶段公开sysfs中的参数(如果非零)
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*/
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module_param(myshort, short, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
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MODULE_PARM_DESC(myshort, "一个短整数");
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module_param(myint, int, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
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MODULE_PARM_DESC(myint, "一个整数");
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module_param(mylong, long, S_IRUSR);
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MODULE_PARM_DESC(mylong, "一个长整数");
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module_param(mystring, charp, 0000);
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MODULE_PARM_DESC(mystring, "一个字符");
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/* module_param_array(name, type, num, perm);
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* name: 数组的名称
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* type: 数组元素的类型
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* num: 指向变量的指针, 该变量将在模块加载时存储用户初始化的数组元素数量
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* perm: 权限位
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*/
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module_param_array(myintarray, int, &arr_argc, 0000);
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MODULE_PARM_DESC(myintarray, "一组整数数组");
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static int __init hello_5_init(void)
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{
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int i;
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pr_info("你好 5\n=============\n");
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pr_info("myshort是一个短整数: %hd\n", myshort);
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pr_info("myint是一个整数: %d\n", myint);
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pr_info("mylong是一个长整数: %ld\n", mylong);
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pr_info("mystring是一个字符: %s\n", mystring);
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for (i = 0; i < ARRAY_SIZE(myintarray); i++)
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pr_info("myintarray[%d] = %d\n", i, myintarray[i]);
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pr_info("从 myintarray 中获得 %d 个参数\n", arr_argc);
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return 0;
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}
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static void __exit hello_5_exit(void)
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{
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pr_info("再见 5\n");
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}
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module_init(hello_5_init);
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module_exit(hello_5_exit);
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