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)

Recreating the echo program

In this hands-on example, we will be recreating the popular echo program found on almost all POSIX systems. The echo program takes all of the input provided to the program and echoes it back to stdout. This program is very simple, with the following program options:

  • -n: Prevents echo from outputting a newline on exit
  • --help: Prints the Help menu
  • --version: Prints some version information

There are two other options, -e and -E; we have omitted them here to keep things simple, but, if desired, would serve as a unique exercise for the reader.

To see the full sources for this example, please see the following:

The main function presented here is a useful pattern to add to all programs and deviates slightly from the original echo program as exceptions...