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 up information in the built-in manual page

In this recipe, we will learn how to look up information in the built-in manual pages. We will learn how we can look up everything from commands, system calls, and standard library functions. The manual pages are mighty once you get used to using them. Instead of searching the internet for answers, it's often quicker—and more accurate—to take a look in the manual.

Getting ready

Some of the manual pages (library calls and system calls) are installed as part of the build-essential package for Debian and Ubuntu. In Fedora-based distributions such as CentOS, these are often already installed in the base system as part of a package called man pages. If you are missing some manual pages, make sure you have installed these packages. Take a look at the very first recipe in this chapter, on how to install packages, to learn more.

If you are on a minimal or slim installation, the man command might not be installed...