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)

Writing a more advanced Makefile

In the previous recipe, we wrote a basic Makefile without using any of its more advanced features. In this recipe, however, we will write a more advanced Makefile, using object files, more variables, dependencies, and other fancy things.

Here, we will create a new program. The program will calculate the area of three different objects: circles, triangles, and rectangles. Each calculation will be performed in its own function, and every function will reside in its own file. On top of that, we will have a function in a separate file for the help text. There will also be a header file that holds all of the function prototypes.

Getting ready

This project will consist of a total of seven files. If you want, you can choose to download all the files from the directory at https://github.com/PacktPublishing/Linux-System-Programming-Techniques/tree/master/ch3/area.

Since we will create a Makefile for this project, I really recommend that you place...