了解ipc通信中的信号。在lunix中编写一段c程序，创建两个子进程执行中让父进程捕获键盘上传来的中断信号（ctrl＋c）；当捕获到该信号，父进程向两个子进程发出一种信号，而子进程捕捉到父进程发来的信号-Learn ipc communication signal. In lunix prepared for some c procedures, the creation of two sub-process of the implementation process to allow the