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Hands-On System Programming with C++
Hands-On System Programming with C++

Hands-On System Programming with C++: Build performant and concurrent Unix and Linux systems with C++17

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Hands-On System Programming with C++

Learning the C, C++17, and POSIX Standards

As stated in Chapter 1, Getting Started with System Programming, system programming is the act of making system calls to perform various actions in coordination with the underlying operating system. Each operating system has its own set of system calls, and how these system calls are made is different.

To prevent the system programmer from having to rewrite their program for each different operating system, several standards have been put into place that wrap the operating system's ABI with a well-defined API.

In this chapter, we will discuss three standards—the C standard, the C++ standard, and the POSIX standard. The C and POSIX standards provide the fundamental language syntax and APIs that wrap an operating system's ABI. Specifically, the C standard defines program linking and execution, the standard C syntax (which...

Technical requirements

Beginning with the C standard language

The C programming language is one of the oldest languages available. Unlike other higher-level languages, C is similar enough to assembly language programming, while still providing some high-level programming abstractions, that it has become a firm favorite among system, embedded, and kernel-level programmers alike.

Almost every major operating system is rooted in C. In addition, most higher-level languages, including C++, build upon C to provide their higher-level constructs, and therefore still require some of the components of the C standard.

The C standard is a huge standard that is managed by the International Organization for Standardization (ISO). We assume the reader has some basic knowledge of the C standard and how to write C code: http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1256.pdf.

For these reasons, the goal of this...

Learning about the C++ standard

The C++ programming language (originally called C with Classes) was designed specifically to provide higher-level facilities than C, including better type safety and object-oriented programming, with system programming in mind. Specifically, C++ aims to provide the performance and efficiency of C programs, while still providing the features of higher-level languages.

Today, C++ is one of the most popular programming languages in the world, used in everything from avionics to banking.

Like the C standard, the C++ standard is huge and is managed by the ISO. We assume the reader has some basic knowledge of the C++ standard and how to write C code: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/n4713.pdf.

For these reasons, the goal of this section is to discuss some topics that are discussed in lesser detail in other books, as well as portions...

Beginning with the POSIX standard

The POSIX standard defines all of the functionality a POSIX-compliant operating system must implement. With respect to system programming, the POSIX standard defines the system call interface (that is, the APIs, not the ABIs) that the operating system must support.

Under the hood, most of the system-level APIs that C and C++ provide actually execute POSIX functions, or are POSIX functions themselves (as is this case with a lot of C library APIs). In fact, libc is generally considered to be a subset of the greater POSIX standard, while C++ leverages libc and POSIX to implement its higher-level APIs such as threading, memory management, error handling, file operations, and input/output. For more information, refer to https://ieeexplore.ieee.org/document/8277153/.

In this section, we will discuss some components of the POSIX standard that are relevant...

Summary

In this chapter, we learned about three different standards: C, C++, and POSIX. The C standard defines the popular C syntax, C-style program linking and execution, and the standard C libraries that provide cross-platform APIs to wrap an operating system's ABIs.

We also learned about the C++ standard, and how it defines the C++ syntax, program linking and execution, and the high-level C++ APIs that wrap underlying C and POSIX APIs to C++.

Finally, we saw how the POSIX standard provides additional APIs that go beyond C. These APIs include (but are not limited to) memory management, networking, and threading. In general, the POSIX standard defines all the standards needed for an application to perform its functions in a cross-platform way on any POSIX-compliant operating system.

The remainder of this book will focus on the APIs defined in these standards, and how they...

Questions

  1. Is the C standard part of the POSIX standard? If so, name an API that is common to both standards.
  2. What is the difference between the _start() and main() functions?
  3. List one of the responsibilities of the C runtime?
  4. Are global constructors executed before or after the main() function?
  5. What is C++ name mangling, and why is it needed?
  6. Name one difference between C and C++ program linking.
  7. What is the difference between a pointer and a reference?
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Key benefits

  • Write system-level code leveraging C++17
  • Learn the internals of the Linux Application Binary Interface (ABI) and apply it to system programming
  • Explore C++ concurrency to take advantage of server-level constructs

Description

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.

Who is this book for?

If you are a fresh developer with intermediate knowledge of C++ but little or no knowledge of Unix and Linux system programming, this book will help you learn system programming with C++ in a practical way.

What you will learn

  • Understand the benefits of using C++ for system programming
  • Program Linux/Unix systems using C++
  • Discover the advantages of Resource Acquisition Is Initialization (RAII)
  • Program both console and file input and output
  • Uncover the POSIX socket APIs and understand how to program them
  • Explore advanced system programming topics, such as C++ allocators
  • Use POSIX and C++ threads to program concurrent systems
  • Grasp how C++ can be used to create performant system applications
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Publication date : Dec 26, 2018
Length: 552 pages
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Language : English
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Table of Contents

15 Chapters
Getting Started with System Programming Chevron down icon Chevron up icon
Learning the C, C++17, and POSIX Standards Chevron down icon Chevron up icon
System Types for C and C++ Chevron down icon Chevron up icon
C++, RAII, and the GSL Refresher Chevron down icon Chevron up icon
Programming Linux/Unix Systems Chevron down icon Chevron up icon
Learning to Program Console Input/Output Chevron down icon Chevron up icon
A Comprehensive Look at Memory Management Chevron down icon Chevron up icon
Learning to Program File Input/Output Chevron down icon Chevron up icon
A Hands-On Approach to Allocators Chevron down icon Chevron up icon
Programming POSIX Sockets Using C++ Chevron down icon Chevron up icon
Time Interfaces in Unix Chevron down icon Chevron up icon
Learning to Program POSIX and C++ Threads Chevron down icon Chevron up icon
Error – Handling with Exceptions Chevron down icon Chevron up icon
Assessments Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

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Edgar E. Pettijohn Jan 11, 2021
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
Lots of typos. Expected it to be more advanced but its pretty much a beginner's book with too much time wasted on stuff you likely won't care about.
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Anna Jan 11, 2021
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It's not original print. Black & white, less pages and awful font. Do not buy here.
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S. Sakarya Nov 04, 2019
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It's an easy book to read and will help with your knowledge of C++17. It could have used some extra proofreading though, because there are numerous little errors and typos throughout the book. I like that it's aimed at Linux systems, but I would suggest making this more explicit in the title as there may be some people not using Linux. What I'm missing is Linux-specific fun stuff like epoll, SO_REUSEPORT, seccomp, etc, etc.Btw, a big no-no is teaching people a server example with one thread per connection, which is a horrible pattern for anyone aiming to work on anything high-traffic or high-performance, which one would assume would be the audience for this book. Otherwise one might as well use a scripting language instead of C++.I would consider this more of an introductory book to give a taste. It's a nice fit in one's library.
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Jonathan L. Oct 27, 2019
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This book is seriously good. I've boughten some sketchy Packt books before (books about Java Spring, for example, were rubbish), but this book restored my confidence in Packt Publishing. Dr. Rian Quinn knows his stuff. I bought this along with The C++ Standard Library. It is expensive but worth it if you want to see some good programming examples that are explained.
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paolo Aug 30, 2019
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Pieno di esempi molto esaustivo negli argomenti trattati, un buon libro per rinfrescarsi le basi della programmazione in C++ e avere le informazioni di base su come lavorare su Linux
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