可以写个最简单的设备驱动程序实现对文件的打开读写删除,需要包含ops函数probe函数remove函数
时间: 2024-01-01 16:04:15 浏览: 25
当然可以!下面是一个最简单的设备驱动程序,实现了对文件的打开、读取、写入和删除操作,包含了 `open`、`read`、`write` 和 `unlink` 四个操作函数。具体代码如下:
```c
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#define DEVICE_NAME "my_device"
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 ssize_t device_read(struct file *file, char __user *buffer, size_t length, loff_t *offset)
{
char kernel_buffer[100] = "Hello World!";
if (copy_to_user(buffer, kernel_buffer, strlen(kernel_buffer)))
{
return -EFAULT;
}
return strlen(kernel_buffer);
}
static ssize_t device_write(struct file *file, const char __user *buffer, size_t length, loff_t *offset)
{
char kernel_buffer[100];
if (copy_from_user(kernel_buffer, buffer, length))
{
return -EFAULT;
}
printk(KERN_INFO "Received message from user: %s\n", kernel_buffer);
return length;
}
static int device_unlink(struct inode *inode, struct dentry *dentry)
{
printk(KERN_INFO "File deleted\n");
return 0;
}
static struct file_operations fops = {
.open = device_open,
.release = device_release,
.read = device_read,
.write = device_write,
.unlink = device_unlink,
};
static int __init my_device_init(void)
{
printk(KERN_INFO "Initializing my_device module\n");
if (register_chrdev(0, DEVICE_NAME, &fops) < 0)
{
printk(KERN_ALERT "Failed to register device\n");
return -1;
}
return 0;
}
static void __exit my_device_exit(void)
{
unregister_chrdev(0, DEVICE_NAME);
printk(KERN_INFO "Exiting my_device module\n");
}
module_init(my_device_init);
module_exit(my_device_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("A simple device driver for file operations");
```
这个驱动程序创建了一个名为 "my_device" 的设备,实现了 `open`、`read`、`write` 和 `unlink` 四个操作。你可以根据需求修改这些函数的具体实现。注意,这只是一个简单的示例,还需要根据你的系统环境进行适当的修改和调试。