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    SubjectRe: [PATCH 2/7] ns: Introduce the setns syscall
    On 05/07/2011 04:24 AM, Eric W. Biederman wrote:
    > With the networking stack today there is demand to handle
    > multiple network stacks at a time. Not in the context
    > of containers but in the context of people doing interesting
    > things with routing.
    > There is also demand in the context of containers to have
    > an efficient way to execute some code in the container itself.
    > If nothing else it is very useful ad a debugging technique.
    > Both problems can be solved by starting some form of login
    > daemon in the namespaces people want access to, or you
    > can play games by ptracing a process and getting the
    > traced process to do things you want it to do. However
    > it turns out that a login daemon or a ptrace puppet
    > controller are more code, they are more prone to
    > failure, and generally they are less efficient than
    > simply changing the namespace of a process to a
    > specified one.
    > Pieces of this puzzle can also be solved by instead of
    > coming up with a general purpose system call coming up
    > with targed system calls perhaps socketat that solve
    > a subset of the larger problem. Overall that appears
    > to be more work for less reward.
    > int setns(int fd, int nstype);
    > The fd argument is a file descriptor referring to a proc
    > file of the namespace you want to switch the process to.
    > In the setns system call the nstype is 0 or specifies
    > an clone flag of the namespace you intend to change
    > to prevent changing a namespace unintentionally.
    > v2: Most of the architecture support added by Daniel Lezcano<>
    > v3: ported to v2.6.36-rc4 by: Eric W. Biederman<>
    > v4: Moved wiring up of the system call to another patch
    > Signed-off-by: Eric W. Biederman<>
    > ---

    Acked-by: Daniel Lezcano <>

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