[ Adding linux-trace-devel too ] On Tue, 15 Jun 2021 11:13:41 -0400 Philippe Proulx <pproulx@xxxxxxxxxxxx> wrote: > On Mon, Jun 14, 2021 at 4:01 PM Mathieu Desnoyers via lttng-dev > <lttng-dev@xxxxxxxxxxxxxxx> 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. That would be great, thanks! -- Steve > > 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@xxxxxxxxxxxxxxx > > https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
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