[lttng-dev] Writing a babeltrace output plugin

[jdesfossez@efficios.com (Julien Desfossez)]

Hi,

>>> I have no other clues in mind [to using the public API] than
>>> looking at the examples already in there
>>
>> Where are the examples of using the public API?
> 
> There is a lttv tree currently under heavy development, and the lttngtop
> git tree on git.lttng.org.

I would recommend looking at this test program :
git://git.dorsal.polymtl.ca/~jdesfossez/babeltrace-api-test

It is a really basic program that uses most of the API.

Julien

> 
>>
>>
>>> for now, all converters are expected to be in-tree.
>>
>> Oh. So the way to go to add another output format for conversion from CTF is to
>> clone the formats/ctf-text directory and make changes as needed?
> 
> Yep.
> 
>>
>>
>> It would have been interesting to see the CTF output part as an example.
>> Can you say when such an option will be available?
> 
> We do not use the intermediate representation for CTF generation (see
> babeltrace-log.c): we generate the metadata directly as needed.
> Generating a CTF output from the CTF intermediate representation is not
> planned at this point, as it has very little use for us. LTTng-UST 2.0
> and LTTng-modules 2.0 both generate CTF natively.
> 
> Thanks,
> 
> Mathieu
> 
>>
>>
>> Cheers,
>>
>> Fredrik
>>
>