[Devel] [PATCH] namespaces: introduce sys_hijack (v4)

[Serge E. Hallyn]

Quoting Paul Menage (menage at google.com):
> On 10/16/07, Serge E. Hallyn <serue at us.ibm.com> wrote:
> > pid, but wasn't sure how best to identify the cgroup.  Originally I was
> > more worried about pid exiting/wraparound, but then decided that with a
> > real container the container_init can't go away until the container goes
> > away anyway.
> 
> For those "real containers" that have init. Not everything is going to
> need that level of virtualization, particularly if you're primarily
> interested in isolation.

Currently every pid namespace's pid==1 must stick around as long as the
pid namespace does.  If you kill the pid==1, all processes in the
container are killed.

> > Anyway, I can go ahead and add 'int which' to the parameter list now,
> > and leave the details of how to specify a cgroup for later.  That way at
> > least the api won't fundamentally change again.
> 
> Great, thanks.

Since the goal here is to get the API right, do you know how we expect
to send the cgroup in?  A string?

Currently my prototype is

+asmlinkage long sys_hijack(unsigned long flags, int which, pid_t pid,
+                               const char __user *cgroup);

But that doesn't seem quite right.  At that point we just ditch 'which'
and use cgroups if it's not NULL, use pid otherwise...

Thoughts?

thanks,
-serge
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