[lttng-dev] [babeltrace] About the type read and write

[Hui Zhu]

On Thu, Aug 23, 2012 at 8:27 PM, Mathieu Desnoyers
<mathieu.desnoyers at efficios.com> wrote:
> * Hui Zhu (teawater at gmail.com) wrote:
>> Hi,
>>
>> I just tried to use libbabeltrace to read and write the CTF file.  But
>> I cannot find the api to read some type of CTF for example
>> CTF_TYPE_ENUM, CTF_TYPE_STRUCT.
>
> AFAIU, the API bt_ctf_get_field_list allows to get the list of
> definitions from a struct, variant, array, or sequence (any compound
> type). Julien, I think the header documentation of this function should
> really be updated, can you look into that ?
>
> Indeed, I also cannot see any API to get the enum string from the field.
> Julien, can we add it ?
>
>> And I cannot find the api file to write to the CTF file. (I check the
>> code of babeltrace-log and found that it use the function that is not
>> API)
>
> Currently, babeltrace only does CTF-to-text and text-log-to-CTF
> conversions. As you noticed, it does not expose API to write into all
> CTF types at this stage.

Do you have plan to expose some API that can write CTF?

Thanks,
Hui

>
> There is a prototype I am aware of that does just that (write custom CTF
> files): Javeltrace. See the post here
> http://lists.lttng.org/pipermail/lttng-dev/2012-August/018393.html for
> details.
>
> Thanks,
>
> Mathieu
>
>>
>> Could you help me with it?
>>
>> Thanks,
>> Hui
>>
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>
> --
> Mathieu Desnoyers
> Operating System Efficiency R&D Consultant
> EfficiOS Inc.
> http://www.efficios.com