压缩包中包含两个文件pipe3.c和pipe4.c，其中在pipe3.c打开一个无名管道，然后使用fork创建一个子进程，在父进程中进行管道写操作；pipe4.c是管道读操作的文件。-Compressed package contains two files pipe3.c and pipe4.c, which opened in pipe3.c an unnamed pipes, and then use the fork to create a child process, the parent process for pipe write operations　pipe4.c read operation is the pipeline files.