Date: Sat, 29 Nov 2008 18:45:29 +0100 From: Alexander Leidinger <Alexander@Leidinger.net> To: Tim Kientzle <kientzle@freebsd.org> Cc: freebsd-current@freebsd.org, Ivan Voras <ivoras@freebsd.org> Subject: Re: HOWTO in wiki: adding custom dtrace probes in the kernel Message-ID: <20081129184529.5ebcb1c5@deskjail> In-Reply-To: <49304D0E.3030201@freebsd.org> References: <20081128154514.82247fe47bn83lkw@webmail.leidinger.net> <ggp10c$pdt$1@ger.gmane.org> <20081128171243.18141hd28pf4ve00@webmail.leidinger.net> <49304D0E.3030201@freebsd.org>
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Quoting Tim Kientzle <kientzle@freebsd.org> (Fri, 28 Nov 2008 11:57:02 -0800): > >> 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. You should talk with jb@ about this, I just make us of what is there. Bye, Alexander. -- http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7 http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137
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