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Linux Process Management(11) > not called exec(), is set.
> 6. Calls get_pid() to assign an available PID to the
> new task.
> 7. Depending on the flags passed to clone(), either
> copy or share open files, filesystem information,
> signal handlers, process address space, and namespace.
> 8. Share the remaining timeslice between the parent and
> its child.
> 9. Cleanup and return a pointer to the new child.
> 2. ==> The kernel runs the child process first. (avoid
> copy-on-write overhead)
> 9. P.24 vfork()
> 1. The vfork() has the same effect as fork(), except that the
> page table entries of the parent process are not copied.
> Instead, the child executes as the sole thread in the
> parent's address space, and the parent is blocked until
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