该程序先使用pipe()函数创建一个临时通信管道，然后使用fork()创建两个子进程，使用write()函数向管道两次写入”I’m parent process。”的信息，两个子进程使用read()函数从管道中获取信息并输出，然后两个子进程分别向管道写入”I’m child process a”和”I’m child process b”信息，由父进程从管道中读出并显示。在使用write()函数前，需要先使用lockf()函数锁住管道，写完信息后再解锁管道。-The program first use pipe () function to create a temporary communications pipe, and then use the fork () to create two sub-processes, use the write () function is written twice to the pipeline " I' m parent process."　Information, the use of two sub-processes read () function to obtain information from the pipe, and output, and then two sub-processes to the pipeline were to write " I' m child process a"　and the " I' m child process b"　information, from the parent process from the pipeline to read and display the . Using the write () function, you need to first use lockf () function is locked pipelines, finish information and then unlock the pipes.