linux中创建 proc节点

#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/uaccess.h>

static int my_proc_read(char *page, char **start, off_t off, int count, int *eof, void *data) {
    int len = sprintf(page, "Hello, World!\n");
    return len;
}

static ssize_t my_proc_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) {
    char buf[32];
    if (copy_from_user(buf, buffer, count)) {
        return -EFAULT;
    }
    buf[count] = '\0';
    printk(KERN_INFO "Received: %s", buf);
    return count;
}

static const struct file_operations my_proc_fops = {
    .read = my_proc_read,
    .write = my_proc_write,
};

static int __init my_proc_init(void) {
    proc_create("my_proc_node", 0666, NULL, &my_proc_fops);
    printk(KERN_INFO "my_proc_node created\n");
    return 0;
}

static void __exit my_proc_exit(void) {
    remove_proc_entry("my_proc_node", NULL);
    printk(KERN_INFO "my_proc_node removed\n");
}

module_init(my_proc_init);
module_exit(my_proc_exit);

MODULE_LICENSE("GPL");