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    SubjectRe: [PATCH] Introduce ActivePid: in /proc/self/status (v2, was Vpid:)
    On 06/16, Cedric Le Goater wrote:
    >
    > We have a case where a task in a parent pid namespace needs to kill
    > another task in a sub pid namespace only knowing its internal pid.
    > the latter has been communicated to the parent task through a file or
    > a unix socket.

    OK, thanks, this partly answers my question... But if they communicate
    anyway, it is not clear why the signal is needed.

    > This 'ActivePid' information in /proc is not sufficient to identity
    > the task, you also need the list of the tasks which are living in
    > the pid namespace.

    Yes, I see.

    > a new kill syscall could be the solution:
    >
    > int pidns_kill(pid_t init_pid, pid_t some_pid);
    >
    > where 'init_pid' identifies the namespace and 'some_pid' identifies
    > a task in this namespace. this is very specific but why not.

    Yes, I also thought about this. Should be trivial.

    Or int sys_tell_me_its_pid(pid_t init_pid, pid_t some_pid).




    Just in case.... This is hack, yes, but in fact you do not need the
    kernel changes to send a signal inside the namespace. You could
    ptrace sub_init, and execute the necessary code "inside" the namespace.

    Oleg.



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