说明：  linux编程入门的绝好教材，从makefile到文件，进程，时间，信号，消息，线程，网络。手把手带你进入linux编程的世界。并附有全部源码。非常经典。
(linux programming excellent entry materials, from the makefile to a file, process, time, signal, message, thread, network. Hands-linux programming to take you into the world. With all the source code. Very classic.)