int lttv_trace_find_hook(LttTrace *t, GQuark marker_name,
GQuark fields[], LttvHook h, gpointer hook_data, GArray **trace_hooks);
int lttv_trace_find_hook(LttTrace *t, GQuark marker_name,
GQuark fields[], LttvHook h, gpointer hook_data, GArray **trace_hooks);