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To: Julian Elischer <julian@elischer.org>
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
In-Reply-To: Your message of "Thu, 03 Jan 2008 17:59:57 PST."
	<477D931D.4000303@elischer.org> 
Date: Fri, 04 Jan 2008 10:38:42 +0000
Message-ID: <5064.1199443122@critter.freebsd.dk>
Sender: phk@critter.freebsd.dk
Cc: arch@freebsd.org
Subject: Re: RFC: sysctl additional functions/macros 
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In message <477D931D.4000303@elischer.org>, Julian Elischer writes:
>I would like to extend the current SYSCTL_INT() with 
>SYSCTL_INT_CLAMPED() or similar, where you also supply a
>maximum acceptable value. (and maybe a clue as to what to say if it is 
>a bad value).

I'm not sure I think it is a good idea.

Next you'll want SYSCTL_INT_BITMAP(), SYSCTL_INT_POWERS_OF_PI() and
so on.

A much better idea would be to add a code argument to a version of
SYSCTL_INT(), so that people could write something like:

SYSCTL_INT(_debug, OID_AUTO, foobar, ORD_WR, &foobar, 0,
	"mumble desc mumble",
	{
	if (newval < 3 || newval > 70 || newval == 59)
		return (EINVAL);
	}
)

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.