linux内核驱动加载编译

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>

static int major_number;

static int device_open(struct inode *inode, struct file *file) {
    printk(KERN_INFO "Device opened\n");
    return 0;
}

static int device_release(struct inode *inode, struct file *file) {
    printk(KERN_INFO "Device closed\n");
    return 0;
}

static struct file_operations fops = {
    .open = device_open,
    .release = device_release,
};

static int __init simple_char_dev_init(void) {
    major_number = register_chrdev(0, "simple_char_dev", &fops);
    if (major_number < 0) {
        printk(KERN_ALERT "Failed to register a major number\n");
        return major_number;
    }
    printk(KERN_INFO "Registered correctly with major number %d\n", major_number);
    return 0;
}

static void __exit simple_char_dev_exit(void) {
    unregister_chrdev(major_number, "simple_char_dev");
    printk(KERN_INFO "Goodbye, Kernel!\n");
}

module_init(simple_char_dev_init);
module_exit(simple_char_dev_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("A simple character device driver");

gcc -c -I/path/to/linux/include simple_char_dev.c -o simple_char_dev.o
ld -r -o simple_char_dev.ko simple_char_dev.o
sudo insmod simple_char_dev.ko
dmesg | tail