C++でLinuxカーネルモジュール、モジュール本体

gistfile1.cpp

#include "stdafx.h"

#define HELLOCXX_MAJOR 204

static const char driver_name[] = "hellocxx";

static int hellocxx_open(struct inode* inode, struct file* f)
{
    return 0;
}

static int hellocxx_release(struct inode* inode, struct file* f)
{
    return 0;
}

static ssize_t hellocxx_read(struct file* f, char* buf, size_t count, loff_t* pos)
{
    if (*pos != 0) {
        return 0;
    }
    char message[] = "Hello, C++\n";
    ssize_t copy_count =
        count < sizeof(message) ? count : sizeof(message);
    copy_to_user(buf, message, copy_count);
    *pos += copy_count;
    return copy_count;
}

static struct file_operations fops = {0};

static int __init hellocxx_init(void)
{
    fops.owner = THIS_MODULE;
    fops.read = hellocxx_read;
    fops.open = hellocxx_open;
    fops.release = hellocxx_release;

    printk("hellocxx init 1\n");
    int r = register_chrdev(HELLOCXX_MAJOR, driver_name, &fops);
    if (r < 0) {
        printk("hellocxx register_chrdev failed %d\n", r);
    }
    printk("hellocxx init 2\n");
    return 0;
}

static void __exit hellocxx_exit(void)
{
    printk("hellocxx exit 1\n");
    unregister_chrdev(HELLOCXX_MAJOR, driver_name);
    printk("hellocxx exit 2\n");
}

MODULE_AUTHOR("saturday06 - Jinsei Owata - <dyob@lunaport.net>");
MODULE_DESCRIPTION("C++ kernel module");
MODULE_LICENSE("Dual BSD/GPL");
module_init(hellocxx_init);
module_exit(hellocxx_exit);