unshare() pid ns

Pavel Emelyanov xemul at openvz.org
Thu Aug 30 07:11:27 PDT 2007

Serge E. Hallyn wrote:
> Quoting Pavel Emelyanov (xemul at openvz.org):
>> sukadev at us.ibm.com wrote:
>>> Pavel,
>>> unshare() of pid ns seems to fail with -EINVAL in 2.6.23-rc3-mm1.
>>> I thought we supported it in the earlier patchsets.  I guess
>>> I missed that in the review of recent patchsets.
>> I disabled unsharing of pid namespaces because it's almost
>> impossible. Look - you have to reattach all the pids to the
>> task with saving its ids as seen in previous namespaces.
> We agree, but thought you for some perverse reason preferred unshare to
> clone for pidns :)

I did that in my first version of patches, but then realized
that such problem (the need in reattaching pids) makes the
unsharing ugly.

BTW, unsharing of a pid namespace is a valid operation, so I
think I will enable it in the nearest future. I have some
thought on how to make such a reattach ;)

> Thanks for clarifying.
> -serge

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