+ struct clock_match *clock_match = user_data;
+ GHashTable *tc_clocks = clock_match->clocks;
+ struct ctf_clock *t_clock = value;
+ GQuark v;
+
+ if (t_clock->absolute)
+ v = t_clock->name;
+ else
+ v = t_clock->uuid;
+ if (v) {
+ struct ctf_clock *tc_clock;
+
+ tc_clock = g_hash_table_lookup(tc_clocks,
+ (gpointer) (unsigned long) v);
+ if (!tc_clock) {
+ /*
+ * For now, we only support CTF that has one
+ * single clock uuid or name (absolute ref).
+ */
+ if (g_hash_table_size(tc_clocks) > 0) {
+ fprintf(stderr, "[error] Only CTF traces with a single clock description are supported by this babeltrace version.\n");
+ }
+ if (!clock_match->tc->offset_nr) {
+ clock_match->tc->offset_first =
+ (t_clock->offset_s * 1000000000ULL) + t_clock->offset;
+ clock_match->tc->delta_offset_first_sum = 0;
+ clock_match->tc->offset_nr++;
+ clock_match->tc->single_clock_offset_avg =
+ clock_match->tc->offset_first;
+ }
+ g_hash_table_insert(tc_clocks,
+ (gpointer) (unsigned long) v,
+ value);
+ } else {
+ int64_t diff_ns;
+
+ /*
+ * Check that the offsets match. If not, warn
+ * the user that we do an arbitrary choice.
+ */
+ diff_ns = tc_clock->offset_s;
+ diff_ns -= t_clock->offset_s;
+ diff_ns *= 1000000000ULL;
+ diff_ns += tc_clock->offset;
+ diff_ns -= t_clock->offset;
+ printf_debug("Clock \"%s\" offset between traces has a delta of %" PRIu64 " ns.",
+ g_quark_to_string(tc_clock->name),
+ diff_ns < 0 ? -diff_ns : diff_ns);
+ if (diff_ns > 10000) {
+ fprintf(stderr, "[warning] Clock \"%s\" offset differs between traces (delta %" PRIu64 " ns). Using average.\n",
+ g_quark_to_string(tc_clock->name),
+ diff_ns < 0 ? -diff_ns : diff_ns);
+ }
+ /* Compute average */
+ clock_match->tc->delta_offset_first_sum +=
+ (t_clock->offset_s * 1000000000ULL) + t_clock->offset
+ - clock_match->tc->offset_first;
+ clock_match->tc->offset_nr++;
+ clock_match->tc->single_clock_offset_avg =
+ clock_match->tc->offset_first
+ + (clock_match->tc->delta_offset_first_sum / clock_match->tc->offset_nr);
+ }
+ }
+}
+
+/*
+ * Whenever we add a trace to the trace collection, check that we can
+ * correlate this trace with at least one other clock in the trace.
+ */
+static int trace_collection_add(struct trace_collection *tc,
+ struct trace_descriptor *td)
+{
+ struct ctf_trace *trace = container_of(td, struct ctf_trace, parent);
+
+ g_ptr_array_add(tc->array, td);
+ trace->collection = tc;
+
+ if (tc->array->len > 1) {
+ struct clock_match clock_match = {
+ .clocks = tc->clocks,
+ .clock_match = NULL,
+ .tc = NULL,
+ };
+
+ /*
+ * With two or more traces, we need correlation info
+ * avalable.
+ */
+ g_hash_table_foreach(trace->clocks,
+ check_clock_match,
+ &clock_match);
+ if (!clock_match.clock_match) {
+ fprintf(stderr, "[error] No clocks can be correlated and multiple traces are added to the collection.\n");
+ goto error;
+ }
+ }
+
+ {
+ struct clock_match clock_match = {
+ .clocks = tc->clocks,
+ .clock_match = NULL,
+ .tc = tc,
+ };
+
+ /*
+ * Add each clock from the trace clocks into the trace
+ * collection clocks.
+ */
+ g_hash_table_foreach(trace->clocks,
+ clock_add,
+ &clock_match);
+ }
+ return 0;
+error:
+ return -EPERM;
+}
+
+int convert_trace(struct trace_descriptor *td_write,
+ struct bt_context *ctx)
+{
+ struct bt_iter *iter;
+ struct ctf_stream *stream;
+ struct ctf_stream_event *event;
+ struct ctf_text_stream_pos *sout;
+ struct bt_iter_pos begin_pos;