On Mon, Jun 14, 2021 at 4:01 PM Mathieu Desnoyers via lttng-dev <lttng-dev@lists.lttng.org> wrote: > > Hi Philippe, Hi Jeremie, > > Steven is interested to use libbabeltrace as a CTF trace reader in the > KernelShark > project. It's a GUI which shows Linux kernel traces. > > He notices that most of the documented usage examples of the libbabeltrace API > focus on use-cases where a custom trace format is converted into CTF. > > I know that the babeltrace2 program is the main user of libbabeltrace at this > point, and that it reads CTF as source. > > For using libbabeltrace as CTF reader for a GUI, what would be the best > examples > to look at as starting point ? Perhaps the babeltrace2 binary, or just adapt a > smaller example program and change the custom trace format source to "ctf.fs" > ? > Or anything else ?
Hello, Unfortunately, the Babeltrace 2 C API documentation [1] doesn't offer a graph building example at the moment. Therefore, indeed, the "best" example would be the babeltrace2(1) CLI (see `src/cli`), although I understand that it's a very generic example which can be overwhelming to explore. However, note that instead of instantiating an existing sink component class (as found in a plugin), you'll want to make your own sink component class to get access to each event message while also controlling the graph operations. Using bt_graph_add_simple_sink_component() [2] would be a good start. I can cook a minimal working example in the following days. Phil [1]: https://babeltrace.org/docs/v2.0/libbabeltrace2/ [2]: https://babeltrace.org/docs/v2.0/libbabeltrace2/group__api-graph.html#gaa8432f03a967d01b764fb1bc959c8e89 > > Thanks, > > Mathieu > > -- > Mathieu Desnoyers > EfficiOS Inc. > http://www.efficios.com > _______________________________________________ > lttng-dev mailing list > lttng-dev@lists.lttng.org > https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev _______________________________________________ lttng-dev mailing list lttng-dev@lists.lttng.org https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
