Hi everyone!
I'm trying to use Babeltrace 2.0.0-pre1 C API to copy some events of
an existing CTF trace (generated with LTTng) into a new one. So I was
wondering how I should open the existing trace and iterate over its
events, as there is no method bt_ctf_iter_create,
bt_ctf_iter_read_event and such, anymore.
Before, with the 1.5 API, I was reading the trace like this :
struct bt_context *ctx = bt_context_create();
int trace_id = bt_context_add_trace(ctx, read_trace_path, "ctf",
NULL, NULL, NULL);
struct bt_ctf_iter *iter = bt_ctf_iter_create(ctx, NULL, NULL);
while ((ctf_event = bt_ctf_iter_read_event(iter))) { ... }
I'm not sure about the proper way to do it now. I tried to replicate
some of the code from babeltrace.c (especially the cmd_run function)
and I'm able to print metadata from the trace (using
bt_component_class_query(src_component_class, "metadata-info", params)
after gettting the ctf plugin and the source component). Can I use
queries in a similar way to access trace events data ?
I also tried to instantiate a new graph, add the ctf plugin components
to the graph and run it, but I don't know how to collect events.
Also, should I define my own custom plugin for that purpose ?
Thanks,
Marie Martin
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