linux 驱动 write

if (write(fd, buffer, count) == -1) {
    perror("write");
    // 检查磁盘空间、权限等
}

if (fsync(fd) == -1) {
    perror("fsync");
}

// 使用更大的缓冲区
char large_buffer[4096];
write(fd, large_buffer, sizeof(large_buffer));

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

static ssize_t my_write(struct file *file, const char __user *ubuf, size_t count, loff_t *ppos) {
    char kbuf[1024];
    if (*ppos > 0 || count > sizeof(kbuf)) {
        return -EFAULT;
    }
    if (copy_from_user(kbuf, ubuf, count)) {
        return -EFAULT;
    }
    // 处理写入的数据
    *ppos += count;
    return count;
}

static struct file_operations my_fops = {
    .write = my_write,
};

static int __init my_init(void) {
    // 注册设备驱动
    return 0;
}

static void __exit my_exit(void) {
    // 注销设备驱动
}

module_init(my_init);
module_exit(my_exit);

MODULE_LICENSE("GPL");