09-23-2008
Thanks for your reasonable advice ...
I probably did not state clearly about the case ... well, for the example ABCD case, it's simple because there are only two processes that could kill the child B.
What I really want to know is that, if it is illegal for any process except C to kill process B, A have to check that who kills B when receives SIGCHLD from B (what if we kill B manually by "kill -9" command ? perhaps A can distinguish them by pid of the killer ?).
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