Operating system creates a new process (child process), and the corresponding table in the process as it creates a new entry. New process and the original process is the same executable program context and data, most of that is the original process (parent process) copies, but they are two independent process! The program should register pc, in the parent, the child process in the context of claim that the implementation of this process is about to return to the fork call (in this case the child does not occupy CPU, the child process is not really saved in the pc register, but as a process context saved in the process table entries in the corresponding.) The problem is how to return the process to split the father and son.

fork.txt

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