ltt_event_position(e, a_event_position);
ltt_event_position_get(a_event_position, &tf, &nb_block, &offset, &tsc);
fprintf(stderr,"Event %s %lu.%09lu [%u 0x%x tsc %llu]\n",
ltt_event_position(e, a_event_position);
ltt_event_position_get(a_event_position, &tf, &nb_block, &offset, &tsc);
fprintf(stderr,"Event %s %lu.%09lu [%u 0x%x tsc %llu]\n",