编写程序实现进程的管道通信。具体要求：首先使用系统调用pipe( )建立一个管道；然后分别创建2个子进程，要求2个子进程分别向管道各写一句话：“Child 1 is sending a message!” 和 “Child 2 is sending a message!” 最后，父进程从管道中读出二个来自子进程的信息并显示。-编写程序实现进程的管道通信。具体要求：首先使用系统调用pipe( )建立一个管道；然后分别创建2个子进程，要求2个子进程分别向管道各写一句话：“Child 1 is sending a message!” 和 “Child 2 is sending a message!” 最后，父进程从管道中读出二个来自子进程的信息并显示。

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Write a program to achieve the process of communication channels. Specific requirements: first, the use of the system call pipe () to build a pipeline　and then create 2 sub process, requirement of 2 sub process respectively to the pipeline each write a word:　Child 1 is sending a message!　and　Child 2 is sending a message!　finally, the parent process　the pipeline read two　the sub process and display information.