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)

Looking at the four stages of compilation

When we generally speak of compilation, we mean the entire process of turning code into a running binary program. But there are actually four steps involved in compiling a source code file into a running binary program, and it's just one of these steps that's called compilation.

Knowing about these four steps, and how to extract the intermediate files, enables us to do everything from writing efficient Makefiles to writing shared libraries.

Getting ready

For this recipe, we will write three small C source code files. You can also download them from https://github.com/PacktPublishing/Linux-System-Programming-Techniques/tree/master/ch3. You'll also need the GCC compiler that we installed in Chapter 1, Getting the Necessary Tools and Writing Our First Linux Programs.

How to do it…

In this recipe, we will create a small program and then manually compile it by executing each step individually, using the compiler...