Re: [PATCH 1/2] New system call, unshare

[Al Viro]

On Mon, Aug 08, 2005 at 03:46:06PM +0100, Alan Cox wrote:
> On Llu, 2005-08-08 at 09:33 -0400, Janak Desai wrote:
> > 
> > [PATCH 1/2] unshare system call: System Call handler function sys_unshare
> 
> 
> Given the complexity of the kernel code involved and the obscurity of
> the functionality why not just do another clone() in userspace to
> unshare the things you want to unshare and then _exit the parent ?

Because you want to keep children?  Because you don't want to deal with
the implications for sessions/groups/etc.?

FWIW, syscall makes sense.  It is a valid primitive and the only reason
to keep it out of clone() (i.e. not making it just another flag to clone())
is that clone() is already cluttered _and_ uses bad calling conventions
for that stuff ("I want to retain <list>" rather than "I want private <list>").
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