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

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Date:	Thu, 22 Oct 2009 06:57:22 -0700
From:	Matt Helsley <matthltc@...ibm.com>
To:	mtk.manpages@...il.com
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Matt Helsley <matthltc@...ibm.com>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.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 Thu, Oct 22, 2009 at 02:14:16PM +0200, Michael Kerrisk wrote:
> Peter,
> 
> On Thu, Oct 22, 2009 at 1:38 PM, H. Peter Anvin <hpa@...or.com> wrote:
> > On 10/22/2009 07:26 PM, Michael Kerrisk wrote:
> >>>
> >>> "3" is number of arguments.
> >>
> >> sys_clone3(struct clone_struct __user *ucs, pid_t __user *pids)
> >>
> >> It appears to me that the number of arguments is 2.
> >>
> >
> > It was 3 at one point... I'm not sure when that changed last :-/
> >
> >>> 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*.
> >>
> >> I'm not sure why you think including a number in the name tells us
> >> "how much more than". Unless you are considering the numbering to be
> >> version numbers, which apparently is not what you mean.
> >
> > It is a version number of sorts.
> 
> So, sometimes, a number in a system call should be the bit width of
> some arguments(s), sometimes it should be the number of arguments, and
> sometimes (well, just occasionally, as in mmap2() and clone()) -- it
> should be a version number? Does the weather play any part in the

In this case 3 could be both the number of arguments and the version
number (clone, clone2, clone3). Match 2 conventions with one choice of
name. :)

Cheers,
	-Matt Helsley
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