本书描述了使用标准接口包括使用Linux独有的高级接口时，在功能和性能之间如何进行权衡取舍的策略。不仅阐释了系统接口应该如何工作，还介绍了它们实际上是如何工作的，以及怎样安全有效地使用它们。包含了帮助你在任何层面编写更佳代码的实用技巧。

在某些时刻，几乎所有的程序员都要与其程序所处操作系统中的系统调用和程序库打交道。本书主要讨论如何编写Linux系统软件——代码位于底层，并且直接跟内核及核心系统程序库对话。《Linux系统编程》描述了使用标准接口包括使用Linux独有的高级接口时，在功能和性能之间如何进行权衡取舍的策略。

该书同样也是一本内行人士编写灵活高效代码的学习指南。作为内核黑客和本书的作者，RobertLove不仅阐释了系统接口应该如何工作，还介绍了它们实际上是如何工作的，以及怎样安全有效地使用它们。《Linux系统编程》包含了帮助你在任何层面编写更佳代码的实用技巧。

本书主题包括：

读写文件以及其他文件I／O操作，包括Linux内核如何实现和管理文件I／O，内存映射与优化技术；

进程管理的系统调用，包括实时进程；

文件与目录——创建、移动、复制、删除和管理；

内存管理——内存分配接口，管理内存，以及优化内存访问；

信号及其在unix系统中的角色，以及基本和高级信号接口；

时间、休眠和时钟管理，从基础开始讲述，并且涵盖POSIX时钟和高精度计时器拥有《Linux系统编程》，你将从理论和应用的角度深入了解Linux，可以最大限度地利用系统的潜能。

Foreword

Preface

1. Introduction and Essential Concepts

System Programming

APIs and ABIs

Standards

Concepts of Linux Programming

Getting Started with Syster~ Programming

2. File I/O

Opening Files

Reading via read( )

Writing with write( )

Synchronized I/O

Direct I/O

Closing Files

Seeking with lseek( )

Positional Reads and Writes

Truncating Files

Multiplexed I/O

Kernel Internals

Conclusion

3. Buffered I/0

User-Buffered I/0

Standard I/0

Opening Files

Opening a Stream via File Descriptor

Closing Streams

Reading from a Stream

Writing to a Stream

Sample Program Using Buffered I/0

Seeking a Stream

Flushing a Stream

Errors and End-of-File

Obtaining the Associated File Descriptor

Controlling the Buffering

Thread Safety

Critiques of Standard I/0

Conclusion

4. Advanced File I/0

Scatter/Gather I/O

The Event Poll Interface

Mapping Files into Memory

Advice for Normal File I/O

Synchronized, Synchronous, and Asynchronous Operations

I/O Schedulers and I/O Performance

Conclusion

5. Process Management

The Process ID

Running a New Process

Terminating a Process

Waiting for Terminated Child Processes

Users and Groups

Sessions and Process Groups

Daemons

Conclusion

6. Advanced Process Management

Process Scheduling

Yielding the Processor

Process Priorities

Processor Affinity

Real-Time Systems

Resource Limits

7. Fileand Directory Management

Files and Their Metadata

Directories

Links

Copying and Moving Files

Device Nodes

Out-of-Band Communication

Monitoring File Events

8. Memory Management

The Process Address Space

Allocating Dynamic Memory

Managing the Data Segment

Anonymous Memory Mappings

Advanced Memory Allocation

Debugging Memory Allocations

Stack-Based Allocations

Choosing a Memory Allocation Mechanism

Manipulating Memory

Locking Memory

Opportunistic Allocation

9. Signals

Signal Concepts

Basic Signal Management

Sending a Signal

Reentrancy

Signal Sets

Blocking Signals

Advanced Signal Management

Sending a Signal with a Payload

Conclusion

10. Time

Time's Data Structures

POSIX Clocks

Getting the Current Time of Day

Setting the Current Time of Day

Playing with Time

Tuning the System Clock

Sleeping and Waiting

Timers

Appendix. GCC Extensions to the C Language

Bibliography

Index