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

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Date:	Thu, 22 Oct 2009 07:03:28 +0900
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.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

On 10/22/2009 04:44 AM, Sukadev Bhattiprolu wrote:
>>
>> "3" is number of arguments.
>
> To me, it is a version number.
>
> mmap() and mmap2() both have 6 parameters.
>

You keep bringing this up.  mmap2() is (a) a non-user-visible call; (b) 
an exception (a mistake, if you want.)

> Besides if wait4() were born before wait3(), would it still be wait4() :-)

Yes.  wait3() came before wait4(), but there never was a wait2().

> 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.

Exactly.

	-hpa
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