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    SubjectRe: [RFC][PATCH 01/20] pid: Intoduce the concept of a wid (wait id)
    Kirill Korotaev <> writes:

    > Eric,
    > 1. I would rename wid to wpid :)

    > 2. Maybe I'm missing something in the discussions, but why is it required? if
    > you provide fully isolated pid spaces, why do you care for wid?
    > And how ptrace can work at all if cldstop reports some pid, but child is not
    > accessiable via ptrace()? and if it doesn't work, what are your changes for?

    A good question.

    My pid spaces while isolated from each other are connected together in
    something that resembles the mount relationship when mounting a filesystem.

    The init process of a child pspace is visible in the parent pspace,
    by it's wid. So you should be able to ptrace pid == 1. The other
    children remain inaccessible directly.

    The idea was to do my very best to preserve the unix process tree when
    constructing a separate pid space.

    I have to admit I have not yet tested the ptrace corner case, or
    digested all of it's ramifications. Unless I have messed up somewhere
    it should just work.

    This visibility of the child tree by a single pid inside the parent
    tree is why I think my approach doesn't suffer from most of the
    problems a completely isolated pid space has.

    In fact I would even be willing to look at it as a global but
    hierarchical pid space if that proved an interesting case.
    So you could have something like pkill(int sig, int which, char *pid_path).
    Where pid_path is something like "1537/3/58", and which specified
    what kind of pid you are talking about (thread, pid, process group...)

    From a security stand point I want the option of a fully isolated
    group of processes, so there is a possibility of keeping secrets from
    the system administrator, but there is no reason that needs to be tied
    to a pid space.

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