进程的管道通信

编制一段程序，实现进程管道通信。使用系统调用pipe()建立一条管道。两个子进程P1和P2分别向管道各写一句话。再观察程序的执行时屏幕上出现的现象，并分析原因

-The process of preparing a pipe communication procedures, process pipe communication. Use of system calls pipe () to establish a pipeline. Two sub-processes P1 and P2, respectively, to write one sentence each pipeline. Then observe the execution of the program appears on the screen when the phenomenon and analyze the reasons