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)

Installing the dynamic library on the system

We have now seen how to create both static and dynamic libraries, and in Chapter 3, Diving Deep into C in Linux, we even saw how we could use a dynamic library from our home directory. But now, the time has come to install a dynamic library system-wide so that any user on your computer can use it.

Knowing how to install a dynamic library on a system will enable you to add libraries system-wide for any user to use.

Getting ready

For this recipe, you'll need the libconvert.so.1 dynamic library we created in the previous recipe. You will also need root access to the system, either via sudo or su.

How to do it…

Installing a dynamic library is just a matter of moving the library file and header file to the correct directory and running a command. However, there are some conventions we should follow:

  1. The first thing we need to do is to copy the library file to the correct place on the system. A common directory...