Book Image

Linux System Programming Techniques

By : Jack-Benny Persson
Book Image

Linux System Programming Techniques

By: Jack-Benny Persson

Overview of this book

Linux is the world's most popular open source operating system (OS). Linux System Programming Techniques will enable you to extend the Linux OS with your own system programs and communicate with other programs on the system. The book begins by exploring the Linux filesystem, its basic commands, built-in manual pages, the GNU compiler collection (GCC), and Linux system calls. You'll then discover how to handle errors in your programs and will learn to catch errors and print relevant information about them. The book takes you through multiple recipes on how to read and write files on the system, using both streams and file descriptors. As you advance, you'll delve into forking, creating zombie processes, and daemons, along with recipes on how to handle daemons using systemd. After this, you'll find out how to create shared libraries and start exploring different types of interprocess communication (IPC). In the later chapters, recipes on how to write programs using POSIX threads and how to debug your programs using the GNU debugger (GDB) and Valgrind will also be covered. By the end of this Linux book, you will be able to develop your own system programs for Linux, including daemons, tools, clients, and filters.
Table of Contents (14 chapters)

Chapter 3: Diving Deep into C in Linux

It's time to take an in-depth look at C programming in Linux. Here, we will learn more about the compiler, the four stages from source code to binary program, how to use the Make tool, and differences between system calls and standard library functions. We will also take a look at some essential header files when it comes to Linux, and look at some C and Portable Operating System Interface (POSIX) standards. C is tightly integrated with Linux, and mastering C will help you understand Linux.

In this chapter, we will develop both programs and libraries for Linux. We will also write both a generic Makefile and more advanced ones for more significant projects. While doing this, we will also learn about the different C standards, why they matter, and how they affect your programs.

This chapter will cover the following recipes:

  • Linking against libraries using the GNU Compiler Collection (GCC)
  • Changing C standards
  • Using system...