Book Image

Hands-On System Programming with C++

By : Dr. Rian Quinn
Book Image

Hands-On System Programming with C++

By: Dr. Rian Quinn

Overview of this book

C++ is a general-purpose programming language with a bias toward system programming as it provides ready access to hardware-level resources, efficient compilation, and a versatile approach to higher-level abstractions. This book will help you understand the benefits of system programming with C++17. You will gain a firm understanding of various C, C++, and POSIX standards, as well as their respective system types for both C++ and POSIX. After a brief refresher on C++, Resource Acquisition Is Initialization (RAII), and the new C++ Guideline Support Library (GSL), you will learn to program Linux and Unix systems along with process management. As you progress through the chapters, you will become acquainted with C++'s support for IO. You will then study various memory management methods, including a chapter on allocators and how they benefit system programming. You will also explore how to program file input and output and learn about POSIX sockets. This book will help you get to grips with safely setting up a UDP and TCP server/client. Finally, you will be guided through Unix time interfaces, multithreading, and error handling with C++ exceptions. By the end of this book, you will be comfortable with using C++ to program high-quality systems.
Table of Contents (16 chapters)

The Unix filesystem

The Unix filesystem, which is used by most Unix-based operating systems, including Linux, consists of a virtual filesystem tree, which is the frontend to the user and applications. The tree starts with the root (that is, /), and all files, devices, and other resources are located within this single root directory.

From there, a physical filesystem is usually mapped onto the virtual filesystem, providing a mechanism by which files are stored and retrieved. It should be noted that this physical filesystem does not have to be a disk; it could also be RAM or some other type of storage device.

To perform this mapping, the operating system has a mechanism for instructing the OS to perform this mapping. On Linux, this is done using /etc/fstab, as follows:

> cat /etc/fstab
UUID=... / ext4 ...
UUID=... /boot/efi vfat ...

As shown in this example, the root filesystem...