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)

Chapter 5: Working with File I/O and Filesystem Operations

File I/O is an important part of system programming since most programs must read or write data to and from files. Doing file I/O also requires the developer to know a thing or two about the filesystem.

Mastering file I/O and filesystem operations will make you not only a better programmer but also a better system administrator.

In this chapter, we will learn about the Linux filesystem and inodes. We will also learn how to read and write files on the system, using both streams and file descriptors. We will also look at system calls to create and delete files and change file permissions and ownership. At the end of the chapter, we will learn how to fetch information about files.

In this chapter, we will cover the following recipes:

  • Reading inode information and learning the filesystem
  • Creating soft links and hard links
  • Creating files and updating the timestamp
  • Deleting files
  • Getting access rights...