LEC-5: Linux open() System Call Tutorial | File Descriptors | Embedded Systems Course Telugu

Linux System Programming – open() System Call | Embedded Systems & Linux Device Drivers Course

In this lecture, we deep dive into the open() system call, one of the most fundamental and frequently used system calls in Linux System Programming. Understanding the open system call is extremely important for anyone who wants to build a strong foundation in embedded systems, embedded Linux, and Linux device drivers development.

The open() system call is used to open files and devices in Linux. Every file operation in Linux such as read(), write(), ioctl(), and close() starts with the open system call. In this lecture, you will clearly understand how user space applications interact with the Linux kernel using system calls and how file descriptors are created and managed internally by the kernel.

This video is part of a free embedded systems course and Linux system programming course in Telugu, specially designed for beginners as well as intermediate learners who want to become embedded software engineers. We explain concepts in a simple and practical way so that even students with basic C programming knowledge can follow along easily.

Topics Covered in This Lecture:

What is open() system call in Linux

Syntax and prototype of open() system call

Understanding file descriptors in Linux

How open() works internally in the Linux kernel

Flags used with open(): O_RDONLY, O_WRONLY, O_RDWR, O_CREAT, O_APPEND, O_TRUNC

File permissions and modes

Relationship between open(), read(), write(), and close()

How open system call is used in Linux device drivers

open() system call flow from user space to kernel space

If you are learning Linux device drivers, this lecture is very important because every character driver starts with implementing the open file operation. Without understanding the open system call, it is impossible to write or debug real-world device drivers used in embedded systems, automotive embedded software, IoT devices, and industrial embedded products.

This embedded systems course also helps students preparing for:

Embedded software engineer interviews

Linux system programming interviews

Linux device driver interview questions

Embedded Linux jobs and projects

Our goal is to provide free embedded systems training, free Linux system programming, and free Linux device drivers course in Telugu, so that students from India can learn industry-level skills without paying high fees to institutes.

This lecture is especially useful for:

Engineering students (ECE, EEE, CSE)

Freshers entering embedded domain

Professionals switching to embedded systems

Anyone interested in Linux kernel and low-level programming

By the end of this lecture, you will have a clear understanding of how the open system call works, how Linux manages files internally, and how this knowledge is applied in embedded Linux and device driver development.

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