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    SubjectRe: [PATCH 0/5 RFC] Add an interface to discover relationships between namespaces
    On Tue, Jul 26, 2016 at 11:32:25AM -0700, W. Trevor King wrote:
    > On Tue, Jul 26, 2016 at 11:25:24AM -0700, Andrew Vagin wrote:
    > > Sure. If a process wants to compare two namespaces, it needs to get file
    > > descriptors for them (open /proc/PID/ns/XXX, use new ioctl-s, find a
    > > process which has them),
    > > and then it calls kcmp(pid1, pid2, KCMP_NSFD, ns_fd1, ns_fd2)
    >
    > If you use the new ioctl-s to get ns_fd2, do you walk your local /proc
    > to find pid2?

    If you use the new ioctl-s to get nf_fd2, you will have it in the
    current process, so pid2 will be getpid().

    pidX identifies a process where to find fdX.

    man 2 kcmp:
    The kcmp() system call can be used to check whether the two processes
    identified by pid1 and pid2 share a kernel resource such as virtual
    memory, file descriptors, and so on.

    >
    > Cheers,
    > Trevor
    >
    > --
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