信号与系统得基本概念 对信号与系统的初步概念-Basic concepts of signals and systems have

正确应用系统调用signal()建立进程与信号（异步事件）之间的联系，理解信号机制； 正确应用系统调用getppid()、kill(),进步理解广义同步的含义。 -The correct application of the system call signal () to establish processes and signal (asynchronous events) the link between understanding the signaling mechanisms