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    SubjectRe: CLONE_PTRACE implementation incomplete

    > > IIRC, Linus has already claimed once that he doesn't very much like the
    > > whole reparenting mess introduced for debugging. He said that instead of
    > > fixing some other bugs in this code, ptrace should be fixed so the ppid of
    > > a process isn't changed just because it's being debugged. (Actually, he
    > > proposed that the connection between debugger and debuggee shouldn't be
    > > made using the p_pptr field, but through another specific field; I believe
    > > this is even quite easy to achieve, as it's very similar to the CLONE_WAIT
    > > flag's implementation...)
    > >
    > > So, if this is fixed, CLONE_PTRACE can truly become standalone (it will
    > > just copy the new p_dbptr field)...
    > >
    > > Any takers? (I can only start on this when I have my new comp, which will
    > > take a few more weeks...)
    > I've thought about doing something like this. I'd really, really, really like
    > to have some way to trace processes without the Heisenberg effect. Because of
    > the reparenting games it plays, ptrace messes up the semantics of the
    > interaction between a traced process and its parent. These alterations
    > greatly limit the usefulness of ptrace. In a proper solution, any changes
    > should be absolutely minimal (e.g., if a process watched itself carefully, it
    > might notice that system calls run slower while it's being traced).

    BTW do you know that with current strace, task can actually do _other_
    syscalls than you see with ptrace() interface?
    I'm "In my country we have almost anarchy and I don't care."
    Panos Katsaloulis describing me w.r.t. patents me at

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