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This book is about writing software that makes the most effective use of the system you''re running on -- code that interfaces directly with the kernel and core system libraries, including the shell, text editor, compiler, debugger, core utilities, and system daemons
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The majority of both Unix and Linux code is still written at the system level, andLinux System Programmingfocuses on everything above the kernel, where applications such as Apache, bash, cp, vim, Emacs, gcc, gdb, glibc, ls, mv, and X exist.Written primarily for engineers looking to program (better) at the low level, this book is an ideal teaching tool for any programmer. Even with the trend toward high-level development, either through web software (such as PHP) or managed code (C#), someone still has to write the PHP interpreter and the C# virtual machine.Linux System Programminggives you an understanding of core internals that makes for better code, no matter where it appears in the stack. Debugging high-level code often requires you to understand the system calls and kernel behavior of your operating system, too.Key topics include:An overview of Linux, the kernel, the C library, and the C compilerReading from and writing to files, along with other basic file I/O operations, including how the Linux kernel implements and manages file I/OBuffer size management, including the Standard I/O libraryAdvanced I/O interfaces, memory mappings, and optimization techniquesThe family of system calls for basic process managementAdvanced process management, including real-time processesFile and directories-creating, moving, copying, deleting, and managing themMemory management -- interfaces for allocating memory, managing the memory youhave, and optimizing your memory accessSignals and their role on a Unix system, plus basic and advanced signal interfacesTime, sleeping, and clock management, starting with the basics and continuing through POSIX clocks and high resolution timersWithLinux System Programming, you will be able to take an in-depth look at Linux from both a theoretical and an applied perspective as you cover a wide range of programming topics.
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