HOWTO in wiki: adding custom dtrace probes in the kernel
Tim Kientzle
kientzle at freebsd.org
Fri Nov 28 11:57:08 PST 2008
>> 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.
Tim
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