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    SubjectRe: A Plumber’ s Wish List for Linux
    On Fri, 07.10.11 00:49, Matt Helsley ( wrote:

    > On Fri, Oct 07, 2011 at 01:17:02AM +0200, Kay Sievers wrote:
    > <snip>
    > > * simple, reliable and future-proof way to detect whether a specific pid
    > > is running in a CLONE_NEWPID container, i.e. not in the root PID
    > > namespace. Currently, there are available a few ugly hacks to detect
    > Is that precisely what's needed or would it be sufficient to know
    > that the pid is running in a child pid namespace of the current pid
    > namespace? If so, I think this could eventually be done by comparing
    > the inode numbers assigned to /proc/<pid>/ns/pid to those of
    > /proc/1/ns/pid.

    I think the most interesting test would be to figure out for a process
    if itself is running in a PID namespace. And for that comparing inodes
    wouldn't work since the namespace process would never get access to the
    inode of the outside init.


    Lennart Poettering - Red Hat, Inc.

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