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)

Learning to Program File Input/Output

File input/output (I/O) is an essential part of most system-level programs. It can be used for debugging, saving program states, handling user-specific data, and even interfacing with physical devices (thanks to POSIX block and character devices).

Prior to C++17, working with file I/O was difficult, as filesystem management had to be handled using non-C++ APIs, which are often unsafe, platform-specific, or even incomplete.

In this chapter, we will provide a hands-on review of how to open, read, and write to files, and work with paths, directories, and the filesystem. We will conclude by providing three different examples that demonstrate how to log to a file, tail an existing file, and benchmark the C++ file input/output APIs.

This chapter will cover the following topics:

  • Ways to open a file
  • Reading and writing to a file
  • File utilities