Messages in this thread | | | Date | Fri, 6 Sep 2002 00:35:22 +0200 (CEST) | From | Ingo Molnar <> | Subject | Re: [patch] ptrace-fix-2.5.33-A1 |
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there are two kinds of wait4 calls, one that gets the WIFSTOPPED event from the debugged task, for this the traced task has to be in the debugger's ->children list.
Another one is when a debugged task exits and its parent wants the exit event. But in this case the task is untraced already, so it gets back into the parent's ->children list.
ie. wait4 should only look at the ->children list - zombies (or traced tasks debugged by this task) can only be there.
The only addition is that in the wait4 non-blocking case we need to look at the traced list as well - since a non-blocking wait4 is a 'could there be any children exiting' kind of query.
Ingo
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