You can find out exactly when the child exits but this is not what you specified which was exec something X seconds after Y event occurs. Forking a kid will do that for you and is quite portable. Why do you need to know when the child finishes? Not in spec. Kid will do its stuff X seconds after Y event. Why monitor it? What would you do if the child failed? If nothing redo Does it really matter? If no redo. What is failure? etc.....
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