Unix编程常见问题(doc 57页)

1. Process Control 进程控制
1.1 Creating new processes: fork() 创建新进程：fork函数
1.1.1 What does fork() do? fork函数干什么？
1.1.2 What's the difference between fork() and vfork()? fork函数与 vfork函数的区别在哪里？
1.1.3 Why use _exit rather than exit in the child branch of a fork? 为何在一个fork的子进程分支中使用_exit函数而不使用exit函数？
1.2 Environment variables 环境变量
1.2.1 How can I get/set an environment variable from a program? 我怎样在程序中获得/设置环境变量？
1.2.2 How can I read the whole environment? 我怎样读取整个环境变量表？
1.3 How can I sleep for less than a second? 我怎样睡眠小于一秒？
1.4 How can I get a finer-grained version of alarm()? 我怎样得到一个更细分时间单位的alarm函数版本(译者注：希望alarm的时间小于一秒)？
1.5 How can a parent and child process communicate? 父子进程如何通信？

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