linux内核编程helloworld（中级）

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[root@bogon modules]# cat first.c#include<linux/kernel.h>#include<linux/stat.h>#include<linux/moduleparam.h>#include<linux/init.h>#include<linux/module.h>static short int a=1;static int b=2;static long int c=3;static char *d="bp";static int myintArray[2]={-1,-1};static int arr_argc=0;module_param(a,short,S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP);MODULE_PARM_DESC(a,"a short integer");module_param(b,int ,S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);MODULE_PARM_DESC(b,"an integer");module_param(c,long,S_IRUSR);MODULE_PARM_DESC(c,"a long integer");module_param(d,charp,0000);MODULE_PARM_DESC(d,"a char string");module_param_array(myintArray,int,&arr_argc,0000);MODULE_PARM_DESC(myintArray,"an array of integers");static int __initdata hellodata=3;static int __init bp_init(void){    int i;    printk(KERN_ALERT "hello world\n");    printk(KERN_ALERT "a is a short integer:%d\n",a);    printk(KERN_ALERT "b is a integer:%d\n",b);    printk(KERN_ALERT "c is a long integer:%d\n",c);    printk(KERN_ALERT "d is a string:%s\n",d);    for(i=0;i<(sizeof(myintArray)/sizeof(int));i++)        printk(KERN_ALERT "myintArray[%d] is %d\n",i,myintArray[i]);    printk(KERN_ALERT   "\nhi,this is bp %d \n",hellodata);    return 0;}static void __exit bp_exit(void){    printk(KERN_ALERT   "\ngoobye bp\n");}module_init(bp_init);module_exit(bp_exit);MODULE_LICENSE("GPL");MODULE_AUTHOR("by bp");MODULE_DESCRIPTION("this is test of bp");MODULE_SUPPORTED_DEVICE("testdevice");[root@bogon modules]# cat Makefile obj-m=first.odefault:    make -C /usr/src/kernels/`uname -r` M=$(PWD) modulesclean:    make -C /usr/src/kernels/`uname -r` M=$(PWD) clean[root@bogon modules]# makemake -C /usr/src/kernels/`uname -r` M=/root/modules modulesmake[1]: Entering directory `/usr/src/kernels/3.10.0-514.el7.x86_64'  Building modules, stage 2.  MODPOST 1 modulesmake[1]: Leaving directory `/usr/src/kernels/3.10.0-514.el7.x86_64'[root@bogon modules]# insmod first.ko a=100[root@bogon modules]# rmmod first[root@bogon modules]# 

运行效果