重要参考网址：【 http://blog.chinaunix.net/uid-10747583-id-2920908.html 】
CONTENTS
module_param的使用：
这里笔记下实例代码。
Makefile：
obj-m := helloparam.o KERNEL_DIR := /lib/modules/$(shell uname -r)/build PWD := $(shell pwd) all: make -C $(KERNEL_DIR) SUBDIRS=$(PWD) modules clean: rm *.o *.ko *.mod.c .PHONY:clean
helloparam.c：
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
MODULE_LICENSE("Dual BSD/GPL");
#define DEFAULT_BOOL_ARRAY_NUM 4
#define DEFAULT_STR_ARRAY_NUM 100
static int default_Num = 100;
static char *pDefault_Str = "[A]Hello World From Kernel";
static char default_Strs[DEFAULT_STR_ARRAY_NUM] = "[B]Hello World From Kernel";
static bool default_Bools[DEFAULT_BOOL_ARRAY_NUM] = {0};
static int boolArr_Num = DEFAULT_BOOL_ARRAY_NUM;
module_param(default_Num, int, S_IRUGO);
module_param(pDefault_Str, charp, S_IRUGO);
module_param_array(default_Bools,bool, &boolArr_Num, S_IRUGO);
module_param_string(default_Strs, default_Strs, DEFAULT_STR_ARRAY_NUM, S_IRUGO);
static int __init hello_init(void)
{
int idx = 0;
printk(KERN_ALERT "Hello world\n");
printk(KERN_ALERT "===============\n");
printk(KERN_ALERT "default_Num:%d\n", default_Num);
printk(KERN_ALERT "pDefault_Str:%s\n", pDefault_Str);
printk(KERN_ALERT "default_Strs:%s\n", default_Strs);
printk(KERN_ALERT "boolArr_Num:%d\n", boolArr_Num);
for(idx = 0; idx<boolArr_Num; idx++)
{
printk(KERN_ALERT "default_Bools[%d]:%d\n", idx, default_Bools[idx]);
}
printk(KERN_ALERT "===============\n");
return 0;
}
static void __exit hello_exit(void)
{
printk(KERN_ALERT "Goodbye world\n");
}
module_init(hello_init);
module_exit(hello_exit);
使用方式：
root@ubuntu:/home/cstriker1407/drivers/helloparam# make make -C /lib/modules/3.13.0-24-generic/build SUBDIRS=/home/cstriker1407/drivers/helloparam modules make[1]: 正在进入目录 `/usr/src/linux-headers-3.13.0-24-generic' CC [M] /home/cstriker1407/drivers/helloparam/helloparam.o Building modules, stage 2. MODPOST 1 modules CC /home/cstriker1407/drivers/helloparam/helloparam.mod.o LD [M] /home/cstriker1407/drivers/helloparam/helloparam.ko make[1]:正在离开目录 `/usr/src/linux-headers-3.13.0-24-generic' root@ubuntu:/home/cstriker1407/drivers/helloparam# insmod helloparam.ko default_Num=500 pDefault_Str=AA default_Strs=BB default_Bools=1,1,0 xx=yy root@ubuntu:/home/cstriker1407/drivers/helloparam# rmmod helloparam root@ubuntu:/home/cstriker1407/drivers/helloparam# insmod helloparam.ko root@ubuntu:/home/cstriker1407/drivers/helloparam# rmmod helloparam
日志：
我们连续插入卸载模块两次，日志如下：
Oct 25 23:31:10 ubuntu kernel: [ 7153.176135] helloparam: unknown parameter 'xx' ignored Oct 25 23:31:10 ubuntu kernel: [ 7153.177261] Hello world Oct 25 23:31:10 ubuntu kernel: [ 7153.177266] =============== Oct 25 23:31:10 ubuntu kernel: [ 7153.177268] default_Num:500 Oct 25 23:31:10 ubuntu kernel: [ 7153.177270] pDefault_Str:AA Oct 25 23:31:10 ubuntu kernel: [ 7153.177271] default_Strs:BB Oct 25 23:31:10 ubuntu kernel: [ 7153.177273] boolArr_Num:3 Oct 25 23:31:10 ubuntu kernel: [ 7153.177275] default_Bools[0]:1 Oct 25 23:31:10 ubuntu kernel: [ 7153.177276] default_Bools[1]:1 Oct 25 23:31:10 ubuntu kernel: [ 7153.177278] default_Bools[2]:0 Oct 25 23:31:10 ubuntu kernel: [ 7153.177279] =============== Oct 25 23:31:27 ubuntu kernel: [ 7170.528498] Goodbye world Oct 25 23:31:35 ubuntu kernel: [ 7178.189365] Hello world Oct 25 23:31:35 ubuntu kernel: [ 7178.189376] =============== Oct 25 23:31:35 ubuntu kernel: [ 7178.189381] default_Num:100 Oct 25 23:31:35 ubuntu kernel: [ 7178.189385] pDefault_Str:[A]Hello World From Kernel Oct 25 23:31:35 ubuntu kernel: [ 7178.189389] default_Strs:[B]Hello World From Kernel Oct 25 23:31:35 ubuntu kernel: [ 7178.189393] boolArr_Num:4 Oct 25 23:31:35 ubuntu kernel: [ 7178.189409] default_Bools[0]:0 Oct 25 23:31:35 ubuntu kernel: [ 7178.189413] default_Bools[1]:0 Oct 25 23:31:35 ubuntu kernel: [ 7178.189417] default_Bools[2]:0 Oct 25 23:31:35 ubuntu kernel: [ 7178.189420] default_Bools[3]:0 Oct 25 23:31:35 ubuntu kernel: [ 7178.189423] =============== Oct 25 23:31:43 ubuntu kernel: [ 7185.667195] Goodbye world
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