nsd_child_event_base
dt_col->event_base = nsd_child_event_base();
struct event_base* nsd_child_event_base(void);
cb_data.base = nsd_child_event_base();
struct event_base* b = nsd_child_event_base();
nsd->event_base = nsd_child_event_base();
struct event_base* event_base = nsd_child_event_base();
event_base = nsd_child_event_base();
xfrd->event_base = nsd_child_event_base();