功能是在进程间完成文件的传送。一个发送进程把两个文件送入消息队列，另外两个接收进程分别从消息队列各自接收一个文件。该例由3个源程序文件组成：user.h 是共用的头部文件，filesnd.c的功能是把两个文件读出并发送到消息队列，filercv.c的功能是从消息队列读取文件。-Function is to complete the file transfer between processes. A sending process the two files into the message queue, the other two receiving process from the message queue to receive a file. This example, the composition consists of three source files: user.h shared head file, the filesnd.c the function is to read the two documents sent to the message queue, the function is filercv.c read the file from the message queue .