linux-kernel - Re: [RFC][v8][PATCH 9/10]: Define clone3() syscall

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Date:	Wed, 21 Oct 2009 12:44:40 -0700
From:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	mtk.manpages@...il.com, Matt Helsley <matthltc@...ibm.com>,
	randy.dunlap@...cle.com, arnd@...db.de,
	Containers <containers@...ts.linux-foundation.org>,
	Nathan Lynch <nathanl@...tin.ibm.com>,
	linux-kernel@...r.kernel.org, Louis.Rilling@...labs.com,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	kosaki.motohiro@...fujitsu.com, mingo@...e.hu,
	linux-api@...r.kernel.org, torvalds@...ux-foundation.org,
	Alexey Dobriyan <adobriyan@...il.com>, roland@...hat.com,
	Pavel Emelyanov <xemul@...nvz.org>
Subject: Re: [RFC][v8][PATCH 9/10]: Define clone3() syscall

H. Peter Anvin [hpa@...or.com] wrote:
> On 10/21/2009 01:26 PM, Michael Kerrisk wrote:
>>
>> My question here is: what does "3" actually mean? In general, system
>> calls have not followed any convention of numbering to indicate
>> successive versions -- clone2() being the one possible exception that
>> I know of.
>>
>
> "3" is number of arguments.

To me, it is a version number.

mmap() and mmap2() both have 6 parameters.

Besides if wait4() were born before wait3(), would it still be wait4() :-)
But I see that it is hard to get one-convention-that-fits-all.

> It's better than "extended" or something  
> like that simply because "extended" just means "more than", and a number  
> at least tells you *how much more than*.

And extended assumes we wont extend again.

An informal poll of reviewers has clone3() with a slight advantage :-)

	clone_extended() camp: Serge Hallyn, Kerrisk, Louis Rilling, 
	clone3(): Sukadev, H. Peter Anvin, Oren, Matt Helsley.

I like clone3() but am not insisting on it. I just want a name...

Sukadev
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