Guide to Writing Linux Character Device Drivers

In Linux systems, character device drivers are one of the key components that enable interaction with user space. This article will introduce the basic process and programming points of Linux character device driver, and provide corresponding source code examples.

1. Header files and macro definitions

Before you start writing a character device driver, you first need to include the necessary header files and define some macro constants and data structures. Here is an example:

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

#define DEVICE_NAME