http://www.advancedlinuxprogramming.com/downloads.html

Overview
If you are a developer for the GNU/Linux system, this book will help you to:

Develop GNU/Linux software that works the way users expect it to.

Write more sophisticated programs with features such as multiprocessing, multi-threading, interprocess communication, and interaction with hardware devices.

Improve your programs by making them run faster, more reliably, and more securely.

Understand the preculiarities of a GNU/Linux system, including its limitations, special capabilities, and conventions.