hello-5.c

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/stat.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("ARNA MAITY");
MODULE_DESCRIPTION("This module illustrates the use of module parameters.");

// Function declarations...
static int __init hello_5_init(void);
static void __exit hello_5_exit(void);

static short int myshort = 1;
static int myint = 420;
static long int mylong = 9999;
static char* mystring = "blah";
static int myintarray[] = {2,3};
static int arr_argc = 2;

// Defining module parameters and giving them descriptions...
module_param(myshort,short,S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
MODULE_PARM_DESC(myshort,"A short integer");

module_param(myint,int,S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
MODULE_PARM_DESC(myint,"An integer");

module_param(mylong,long,S_IRUSR);
MODULE_PARM_DESC(mylong,"A long integer");

module_param(mystring,charp,0000);
MODULE_PARM_DESC(mystring,"A character string");

module_param_array(myintarray,int,&arr_argc,0000);
MODULE_PARM_DESC(myintarray,"An array of integers");

static int __init hello_5_init(void){
    int i;
    printk(KERN_INFO"Hello Kernel!\n ================ \n");
    printk(KERN_INFO"myshort is a short integer: %hd\n",myshort);
    printk(KERN_INFO"myint is an integer: %d\n",myint);
    printk(KERN_INFO"mylong is a long integer: %ld\n",mylong);
    printk(KERN_INFO"mystring is a string: %s\n",mystring);
    for(i=0;i<sizeof(myintarray)/sizeof(int);i++){
        printk(KERN_INFO"myintarray[%d] = %d\n",i,myintarray[i]);
    }
    printk(KERN_INFO"Got %d arguments for myintarray.\n", arr_argc);
    return 0;
}

static void __exit hello_5_exit(void){
    printk(KERN_INFO"Goodbye Kernel!\n");
}

module_init(hello_5_init);
module_exit(hello_5_exit);