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 receiver

In the previous recipe, we wrote a program that creates a FIFO and writes a message to it. We also tested it using cat to receive the messages. In this recipe, we'll write a C program that reads from the FIFO.

Reading from a FIFO isn't any different than reading from a regular file, or let's say, stdin.

Getting ready

Before you start this recipe, it's best if you complete the previous recipe first. We'll use the program from the previous recipe to write data to the FIFO that we'll receive in this recipe.

You'll also 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 receiving program for the sender we wrote in the previous recipe. Let's get started:

  1. Write the following code in a file and save it as fifo-receiver.c. We will open the FIFO with a file stream and then read it character by character...