System Calls Explained: fork, exec, wait, exit
Every process on your computer goes through the same life cycle. Most developers never learn it properly.
In this video, we break down the Process Life Cycle in Operating Systems — step by step — using the exact system calls that power every program running on your machine.
You'll learn:
✅ How fork() creates a new child process
✅ How exec() replaces a process with a new program
✅ How wait() keeps parent and child processes in sync
✅ What exit() does when a process finishes
✅ What a zombie process is — and why it happens in real systems
We also connect it all to something you use every day: the terminal. See exactly how a command like ls runs behind the scenes using fork, exec, and wait.
Whether you're prepping for OS interviews, studying for exams, or just building strong fundamentals — this one is worth your time.
Timestamps:
00:00 Introduction
00:25 System Calls Basics
01:16 Libraries vs System Calls
02:00 Key System Calls Overview
02:06 fork() Explained
02:51 exec() Explained
03:13 wait() Explained
03:30 exit() & Zombie Processes
04:08 Terminal Workflow (Real Example)
04:51 Summary
05:09 Outro
📌 Topics Covered:
Process Life Cycle | System Calls in OS | fork() exec() wait() exit() | Process Creation in Operating System | Zombie Process | Process Management OS | Operating System Concepts
🎓 Part of the 8BrightBits Operating Systems Course — clear explanations, zero jargon.
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