Content In Linux driver development, have you encountered the problem of how to store private data for different device instances? For example, a USB camera needs to store resolution parameters, while a GPIO device needs to record interrupt handler functions. Directly modifying the kernel’s <span>struct device</span> structure? This would obviously break the encapsulation of the … Read more
In the C language, <span>const</span> and <span>static</span> are two very commonly used keywords that relate to the modifiability, lifecycle, and scope of variables. By combining variable declarations, pointer usage, and function design, we can flexibly control the access permissions, visibility, and lifetime of variables. 1. const (Constant Modifier) <span>const</span> is used to declare read-only variables, … Read more
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Swap Algorithm: Addition and Subtraction MethodIn the previous chapters, we introduced the temporary variable method in the C language swap algorithm, which is a relatively basic method. However, it requires defining a temporary variable to temporarily store the value at the memory address pointed to by the parameters (pointers), which necessitates an extra memory space.The … Read more
Have you ever found yourself staring blankly at your textbook late at night, while your mind wanders to whether you should have had a bit more for dinner? I have also experienced those days, feeling as if the entire world was pressing down on me, just wanting to find a safe haven. I want to … Read more
Today, let’s talk about the various application scenarios of pointers in the C language. Pointers play a crucial role in programming; they are like a “core tool” that helps us manipulate data precisely in the world of memory. As a seasoned technician, I will guide you through the powerful functions of pointers in an easy-to-understand … Read more
In the C language, <span>extern</span>, <span>volatile</span>, and <span>inline</span> are three widely used keywords, each related to cross-file variable declarations, compiler optimization control, and function inlining. Mastering their usage can effectively enhance code structure, stability, and performance. 1. extern (External Variable Declaration) <span>extern</span> is used to declare global variables or functions defined in other files, enabling … Read more
string.h is one of the most commonly used libraries in C language, which can be broadly divided into memory operations and string operations. This article will detail all the functions in <span>memory operations</span>. 🌟 1. Memory Operations <span>memcpy</span> Function: Copies n bytes from the source address to the destination address. Prototype:<span>extern void *memcpy (void *__restrict … Read more
Click the blue text to follow immediately In today’s AI-driven era, the software development process is undergoing unprecedented changes. While cutting-edge AI models like DeepSeek and ChatGPT are widely used for code generation, documentation writing, and requirement analysis, significantly enhancing development efficiency, the field of C language unit testing remains mired in “manual mode”: facing … Read more
In C language, input and output are the most basic operations, so it is essential to master some of the most commonly used rules. We mainly understand the standard library functions that implement input and output functionality defined in the <span><span><stdio.h></span></span> header file.1. Standard Output Function:printf() 1. Function Purpose and Functionality <span><span>printf()</span></span> is the most … Read more