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)

FIFO – building the sender

Now that we know what a FIFO is, we'll move on and write a program that can create and use a FIFO. In this recipe, we'll write a program that creates a FIFO and then sends a message to it. In the next recipe, we'll write a program that receives that message.

Knowing how to use FIFOs programmatically will enable you to write programs that can communicate between themselves using a FIFO directly, without needing to redirect the data via the shell.

Getting ready

We'll need the usual tools; that is, the GCC compiler, the Make tool, and the generic Makefile.

How to do it…

In this recipe, we'll write a program that creates a FIFO and sends a message to it:

  1. Write the following code in a file and save it as fifo-sender.c. This code is a bit longer, so we'll cover it step by step here. Remember that all the code goes in the same file. Let's start with the #include lines, the prototype for the...