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Date: Mon, 1 Dec 2008 18:34:49 +0100
From: "=?ISO-8859-1?Q?Marius_N=FCnnerich?=" <marius@nuenneri.ch>
To: "Tim Kientzle" <kientzle@freebsd.org>
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References: <20081128154514.82247fe47bn83lkw@webmail.leidinger.net>
	<ggp10c$pdt$1@ger.gmane.org>
	<20081128171243.18141hd28pf4ve00@webmail.leidinger.net>
	<49304D0E.3030201@freebsd.org>
Cc: Alexander Leidinger <Alexander@leidinger.net>, freebsd-current@freebsd.org,
	Ivan Voras <ivoras@freebsd.org>
Subject: Re: HOWTO in wiki: adding custom dtrace probes in the kernel
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On Fri, Nov 28, 2008 at 8:57 PM, Tim Kientzle <kientzle@freebsd.org> wrote:
>>>  SDT_PROBE(foobar, source_file1, foo, entry, a, b, 0, 0, 0);
>>>
>>> Here: why are the last three arguments zeroes?
>>
>> SDT_PROBE() is a macro with a fixed number of macros, so we have to  fill
>> with 0 in case we don't want to provide some data. Maybe there's  a way to
>> provide more arguments if you do it by hand instead of using  the
>> SDT_PROBE() macro (TODO item added in the wiki to have a look at  this, feel
>> free to improve the wiki page).
>
> Seems that SDT_PROBE() should be using C99s "variadic macro"
> feature.

Is the kernel compiled in C99 mode?