Lesson 32: Checking for Errors with errno in C | Error Handling in C Programming

Welcome to Lesson 32 of the Zero2Hero C Programming Course (2024) – your ultimate journey from beginner to advanced level in C programming!

In this lesson, we take a deep dive into one of the most essential parts of building robust and fault-tolerant programs:
✅ Error Handling using errno in C

You will learn:

🔹 What is errno and when it gets set
🔹 How to check if a standard library function has failed
🔹 Using strerror() and perror() to print descriptive error messages
🔹 Practical scenarios such as file operations and system calls
🔹 How to debug and trace issues efficiently in C programs
🔹 Best practices for clean and defensive C code

Whether you're preparing for a system programming interview, working on real-world Linux-based projects, or just aiming to master low-level programming — understanding how errno works will elevate your debugging and error recovery skills dramatically.

🎯 By the end of this video, you'll not only understand the theory behind errno, but you'll also see real-life coding examples to solidify your knowledge.

📚 This course is based on the paid bootcamp by Low Level Academy recorded in December 2024 — now brought to you for free!

📂 Download course materials, exercises, and practice code here:

💬 Found any mistake, outdated part, or want bonus content?
Comment below and let me know — I might just upload an automatic code checker or random exercise videos to help you master this better!

📌 Make sure to subscribe, like, and hit the bell icon 🔔 so you don’t miss the next chapter in this C programming masterclass.

🔖 Topics Covered:
C errno Basics

strerror() and perror()

File I/O Error Detection

Error Codes (EIO, ENOMEM, EINVAL, etc.)

Manpages and glibc Integration

Debugging in Linux Environment

#CProgramming #ErrorHandling #errno #SystemProgramming #Zero2Hero #LowLevelProgramming #LinuxC #LearnC #CLanguage #ProgrammingTutorial #CErrorCodes #DebuggingC #LinuxDevelopment #SoftwareDevelopment