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Linux System Programming Techniques

You're reading from   Linux System Programming Techniques Become a proficient Linux system programmer using expert recipes and techniques

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Product type Paperback
Published in May 2021
Publisher Packt
ISBN-13 9781789951288
Length 432 pages
Edition 1st Edition
Tools
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Author (1):
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Jack-Benny Persson Jack-Benny Persson
Author Profile Icon Jack-Benny Persson
Jack-Benny Persson
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Table of Contents (14) Chapters Close

Preface 1. Chapter 1: Getting the Necessary Tools and Writing Our First Linux Programs 2. Chapter 2: Making Your Programs Easy to Script FREE CHAPTER 3. Chapter 3: Diving Deep into C in Linux 4. Chapter 4: Handling Errors in Your Programs 5. Chapter 5: Working with File I/O and Filesystem Operations 6. Chapter 6: Spawning Processes and Using Job Control 7. Chapter 7: Using systemd to Handle Your Daemons 8. Chapter 8: Creating Shared Libraries 9. Chapter 9: Terminal I/O and Changing Terminal Behavior 10. Chapter 10: Using Different Kinds of IPC 11. Chapter 11: Using Threads in Your Programs 12. Chapter 12: Debugging Your Programs 13. Other Books You May Enjoy

Chapter 9: Terminal I/O and Changing Terminal Behavior

In this chapter, we learn what a TTY (short for TeleTYpewriter) and a PTY (short for Pseudo-TeletYpewriter) are and how to get information about them. We also learn how to set their attributes. Then, we write a small program that takes input without echoing the text—perfect for a password prompt. We also write a program that checks the size of the current terminal.

A terminal can take many forms—for example, a terminal window in X (the graphical frontend); the seven terminals accessed with Ctrl + Alt + F1 through F7; an old serial terminal; a dial-up terminal; or a remote terminal such as Secure Shell (SSH).

A TTY is a hardware terminal, such as the consoles accessed with Ctrl + Alt + F1 through F7, or a serial console.

A PTY, on the other hand, is a pseudo-terminal, meaning it's emulated in software. Examples of PTYs are programs such as xterm, rxvt, Konsole, Gnome Terminal, or a terminal multiplexer...

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