Professional Linux Programming

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As Linux continues to grow in popularity, there has never been more of a need to understand how to develop for this platform. Rather than focusing on a particular language or development technique, Professional Linux Programming looks at the different development environments within Linuxthe kernel, the desktop, and the weband then demonstrates best practices, tools, and techniques for integrating applications with the OS as a whole. This book is essential for understanding the nuances that differentiate programming for Linux from programming for any other platform. After beginning with simple shell scripts, the reader quickly moves on to the more advanced topics like software drivers and the graphical interface.

The wide variety of tools that you can use to build application software, utilities, and even the Linux kernel itself are covered. You'll also explore the unique components of a Linux system and delve into the inner workings of the system. And you'll find out how to use Linux with the web by writing software for the LAMP (Linux, Apache, MySQL, Perl/Python) stack. You'll then be able to apply this information to streamline software development while incorporating cutting-edge features and functionality.

What you will learn from this book
*How to use tools such as compilers, debuggers, and Software Configuration Management
*Ways to interact with Linux systems through network interfaces, graphical user environments, and LAMP stacks
*Techniques for building software for different compatible platforms
*Tips for utilizing the GNU automated build for faster development
*Steps for using emulation and virtualization technologies for kernel development and application testing
*How to write your own GNOME software and powerful web applications

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xv Contents Graphical Debugging Tools 299 DDD 299 Eclipse 302 Kernel Debugging 305 Don’t Panic! 306 Making Sense of an oops 307 Using UML for Debugging 309 An Anecdotal Word 312 A Note about In-Kernel Debuggers 313 Summary 313 Chapter 11: The GNOME Developer Platform 315 GNOME Libraries 316 Glib 316 GObject 316 Cairo 316 GDK 317 Pango 317 GTK+ 317 libglade 318 GConf 318 GStreamer 318 Building a Music Player 319 Requirements 319 Getting Started: The Main Window 319 Building the GUI 321 Summary 340 Chapter 12: The FreeDesktop Project 341 D-BUS: The Desktop Bus 341 What Is D-Bus? 342 Under D-Hood of D-Bus 342 D-Bus Methods 346 Hardware Abstraction Layer 350 Making Hardware Just Work 350 Hal Device Objects 353 The Network Manager 358 Other Freedesktop Projects 360 Summary 360 02_776130 ftoc.qxp 2/2/07 10:13 PM Page xv xvi Contents Chapter 13: Graphics and Audio 361 Linux and Graphics 361 X Windows 362 Open Graphics Library 364 OpenGL Utilities Toolkit 365 Simple Directmedia Layer 365 Writing OpenGL Applications 365 Downloading and Installing 366 Programming Environment 367 Using the GLUT Library 368 Writing SDL Applications 382 Downloading and Installing 382 Programming Environment 383 Using the SDL Library 383 Summary 394 Chapter 14: LAMP 395 What Is LAMP? 395 Apache 396 MySQL 396 PHP 397 The Rebel Platform 397 Evaluating the LAMP Platform 397 Apache 399 Virtual Hosting 400 Installation and Configuration of PHP 5 401 Apache Basic Authentication 402 Apache and SSL 402 Integrating SSL with HTTP Authentication 403 MySQL 404 Installing MySQL 404 Configuring and Starting the Database 404 Changing the Default Password 405 The MySQL Client Interface 405 Relational Databases 405 SQL 406 The Relational Model 409 PHP 411 The PHP Language 411 Error Handling 420 Error-Handling Exceptions 421 02_776130 ftoc.qxp 2/2/07 10:13 PM Page xvi xvii Contents Optimization Techniques 422 Installing Additional PHP Software 427 Logging 427 Parameter Handling 428 Session Handling 429 Unit Testing 430 Databases and PHP 432 PHP Frameworks 432 The DVD Library 433 Version 1: The Developer’s Nightmare 433 Version 2: Basic Application with DB-Specific Data Layer 434 Version 3: Rewriting the Data Layer,Adding Logging and Exceptions 437 Version 4: Applying a Templating Framework 441 Summary 442 Index 443 GNU 47 Acknowledgments ix Introduction xix Chapter 1: Working with Linux 1 A Brief History of Linux 2 The GNU Project 2 The Linux Kernel 3 Linux Distributions 4 Free Software vs. Open Source 4 Beginning Development 5 Choosing a Linux Distribution 6 Installing a Linux Distribution 8 Linux Community 15 Linux User Groups 15 Mailing lists 16 IRC 16 Private Communities 16 Key Differences 16 Linux Is Modular 17 Linux Is Portable 17 Linux Is Generic 17 Summary 18 Chapter 2: Toolchains 19 The Linux Development Process 19 Working with Sources 20 Configuring to the Local Environment 21 Building the Sources 22 Components of the GNU Toolchain 23 The GNU Compiler Collection 23 The GNU binutils 34 GNU Make 39 The GNU Debugger 40 02_776130 ftoc.qxp 2/2/07 10:13 PM Page xi xii Contents The Linux Kernel and the GNU Toolchain 44 Inline Assembly 44 Attribute Tags 45 Custom Linker Scripts 45 Cross-Compilation 46 Building the GNU Toolchain 47 Summary 48 Chapter 3: Portability 49 The Need for Portability 50 The Portability of Linux 51 Layers of Abstraction 51 Linux Distributions 52 Building Packages 57 Portable Source Code 70 Internationalization 81 Hardware Portability 88 64-Bit Cleanliness 89 Endian Neutrality 89 Summary 92 Chapter 4: Software Configuration Management 93 The Need for SCM 94 Centralized vs. Decentralized Development 95 Centralized Tools 95 The Concurrent Version System 96 Subversion 104 Decentralized tools 108 Bazaar-NG 109 Linux kernel SCM (git) 112 Integrated SCM Tools 115 Eclipse 115 Summary 117 Chapter 5: Network Programming 119 Linux Socket Programming 119 Sockets 120 Network Addresses 122 Using Connection-Oriented Sockets 123 Using Connectionless Sockets 130 02_776130 ftoc.qxp 2/2/07 10:13 PM Page xii xiii Contents Moving Data 133 Datagrams vs. Streams 133 Marking Message Boundaries 137 Using Network Programming Libraries 140 The libCurl Library 140 Using the libCurl Library 141 Summary 147 Chapter 6: Databases 149 Persistent Data Storage 149 Using a Standard File 150 Using a Database 150 The Berkeley DB Package 152 Downloading and Installing 153 Building Programs 154 Basic Data Handling 154 The PostgreSQL Database Server 165 Downloading and Installing 165 Building Programs 167 Creating an Application Database 167 Connecting to the Server 169 Executing SQL Commands 173 Using Parameters 181 Summary 184 Chapter 7: Kernel Development 185 Starting Out 185 Kernel Concepts 199 A Word of Warning 200 The Task Abstraction 200 Virtual Memory 205 Don’t Panic! 208 Kernel Hacking 208 Loadable Modules 209 Kernel Development Process 211 Git: the “Stupid Content Tracker” 212 The Linux Kernel Mailing List 213 The “mm” Development Tree 215 The Stable Kernel Team 215 LWN: Linux Weekly News 216 Summary 216 02_776130 ftoc.qxp 2/2/07 10:13 PM Page xiii xiv Contents Chapter 8: Kernel Interfaces 217 What Is an Interface? 217 Undefined Interfaces 218 External Kernel Interfaces 219 System Calls 219 The Device File Abstraction 224 Kernel Events 238 Ignoring Kernel Protections 239 Internal Kernel Interfaces 243 The Kernel API 243 The kernel ABI 244 Summary 245 Chapter 9: Linux Kernel Modules 247 How Modules Work 247 Extending the Kernel Namespace 250 No Guaranteed Module Compatibility 251 Finding Good Documentation 251 Linux Kernel Man Pages 251 Writing Linux Kernel Modules 252 Before You Begin 253 Essential Module Requirements 253 Logging 256 Exported Symbols 257 Allocating Memory 259 Locking considerations 267 Deferring work 275 Further Reading 283 Distributing Linux Kernel Modules 284 Going Upstream 284 Shipping Sources 284 Shipping Prebuilt Modules 284 Summary 285 Chapter 10: Debugging 287 Debugging Overview 287 A Word about Memory Management 288 Essential Debugging Tools 289 The GNU Debugger 289 Valgrind 298 02_776130 ftoc.qxp 2/2/07 10:13 PM Page xiv
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