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)

Viewing terminal information

In this recipe, we'll learn more about what TTYs and PTYs are and how to read their attributes and information. This will help us in our understanding of TTYs as we move forward in the chapter. Here, we learn how to find out which TTY or PTY we are using, where it lives on the filesystem, and how to read its attributes.

Getting ready

There are no special requirements for this recipe. We'll only use standard programs that are already installed.

How to do it…

In this recipe, we'll explore how to find your own TTY, what attributes it has, where its corresponding file lives, and what kind of TTY it is:

  1. Start by typing tty in your terminal. This will tell you which TTY you are using on the system. There can be many TTYs and PTYs on a single system. Each of them is represented by a file on the system:
    $> tty
    /dev/pts/24
  2. Now, let's examine that file. As we see here, it's a special file type, called character...