这个工程是用于研究Linux环境编程的一些细节。 其中每个目录聚焦于一个主题，每个主题目录下面，每个问题又有自己的单独目录。
因为这些是测试代码，所以没有细致的进行错误处理。就直接退出进程了事:))
后面为了方便，干脆都没有检查函数的返回值:))在工作中，可不能这样哦~~~
每一个子目录都验证Linux编程的一个问题。 要了解细节的话，可以进入具体的目录得到详细的解答。
每个目录下面都有一个README.md文件，用于介绍该目录或者分析具体的问题。
This project is used to investigate on the details of Linux programming. Every directory focuses on one topic. Every topic dir contains different dir which investigates on different problems.
Becasue they are test codes, so I don't perform the delicated error handler. Just exit the process :)) I don't check the return value of function in the latter codes. But you could not do it in real product:))
Every directory focuses on one Linux topic. For example, the signal dir focuses on the signal details of Linux Programming.
There is one README.md file in every directory. It is used to introduce the dir or analyze the details of one problem.