[PATCH] Handle CLONE_PARENT flag

[Wang Chao]

Hi Roland,
> It would be nice to see a test case
> where the old code goes wrong and the fix makes it better.
> 

I attached a simple program. The wait call returns immediately
and the whole program ends up normally. But if we use strace to
trace it, because strace doesn't handle CLONE_PARENT, the wait
call will be blocked by strace, and trace will not end up until
we kill the new cloned process, which is obviously not correct.

Best regards,
Wang Chao
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