资源说明：program that creates processes while it is executing. The program (also called the parent process) and create 4 child processes. The first child process runs forever and prints out to the standard output its process identification number. The rest of the child processes replace themselves immediately with new executable programs which are created from their own programs (e.g., a run-forever program that prints out its process ID) These programs run forever so that you can observe the effect of concurrent processes sharing the same output device (the computer terminal in this case).

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