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    SubjectRe: [patch] ptrace-fix-2.5.33-A1
    On Fri, Sep 06, 2002 at 12:35:22AM +0200, Ingo Molnar wrote:
    >
    > 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.

    OK. I think that the !list_empty (ptrace_children) isn't really enough
    - since there can be things on our children list that we will not wait
    for - should we be iterating over it making the same checks we do
    above?

    --
    Daniel Jacobowitz
    MontaVista Software Debian GNU/Linux Developer
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