If you really want to get your hands on the “dirty job” and become a serious Linux programmer, I really recommend you to read the following book.

It’s called Advanced Linux Programming and is distributed under the GNU General Public License so you’re free to copy, share, and most important: read it.

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As the publisher says, 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.

If you’re a developer already experienced with programming for the GNU/Linux system, are experienced with another UNIX-like system and are interested in developing GNU/Linux software, or want to make the transition for a non-UNIX environment and are already familiar with the general principles of writing good software, this book is for you. In addition, you will find that this book is equally applicable to C and C++ programming. Even those progamming in other languages will find this book useful since the C language APIs and conventions are the lingua franca of GNU/Linux.

As an advice, you will need a solid grasp of C programming knowledge.

Thruth be told, good luck.