the memory associated with an event may be reused at each read. */
-/* Obtain the tracefile unique integer id associated with the type of
+/* Obtain the trace unique integer id associated with the type of
this event */
-unsigned ltt_event_eventtype_id(ltt_event *e);
+unsigned ltt_event_eventtype_id(LttEvent *e);
/* Facility and type for the event */
-ltt_facility *ltt_event_facility(ltt_event *e);
+LttFacility *ltt_event_facility(LttEvent *e);
-ltt_eventtype *ltt_event_eventtype(ltt_event *e);
+LttEventType *ltt_event_eventtype(LttEvent *e);
+
+
+/* Root field for the event */
+
+LttField *ltt_event_field(LttEvent *e);
-ltt_field *ltt_event_field(ltt_event *e);
/* Time and cycle count for the event */
-ltt_time ltt_event_time(ltt_event *e);
+LttTime ltt_event_time(LttEvent *e);
+
+LttCycleCount ltt_event_cycle_count(LttEvent *e);
+
-ltt_cycle_count ltt_event_cycle_count(ltt_event *e);
+/* Obtain the position of the event within the tracefile. This
+ is used to seek back to this position later or to seek to another
+ position, computed relative to this position. The event position
+ structure is opaque and contains several fields, only two
+ of which are user accessible: block number and event index
+ within the block. */
+void ltt_event_position(LttEvent *e, LttEventPosition *ep);
-/* CPU id and system name of the event */
+void ltt_event_position_get(LttEventPosition *ep,
+ unsigned *block_number, unsigned *index_in_block, LttTracefile ** tf);
-unsigned ltt_event_cpu_id(ltt_event *e);
+void ltt_event_position_set(LttEventPosition *ep,
+ unsigned block_number, unsigned index_in_block);
-char *ltt_event_system_name(ltt_event *e);
+
+/* CPU id of the event */
+
+unsigned ltt_event_cpu_id(LttEvent *e);
/* Pointer to the raw data for the event. This should not be used directly
unless prepared to do all the architecture specific conversions. */
-void *ltt_event_data(ltt_event *e);
+void *ltt_event_data(LttEvent *e);
-/* The number of elements in a sequence field is specific to each event.
- This function returns the number of elements for an array or sequence
- field in an event. */
+/* The number of elements in a sequence field is specific to each event
+ instance. This function returns the number of elements for an array or
+ sequence field in an event. */
-unsigned ltt_event_field_element_number(ltt_event *e, ltt_field *f);
+unsigned ltt_event_field_element_number(LttEvent *e, LttField *f);
/* Set the currently selected element for a sequence or array field. */
-int ltt_event_field_element_select(ltt_event *e, ltt_field *f, unsigned i);
+void ltt_event_field_element_select(LttEvent *e, LttField *f, unsigned i);
+
+
+/* A union is like a structure except that only a single member at a time
+ is present depending on the specific event instance. This function tells
+ the active member for a union field in an event. */
+
+unsigned ltt_event_field_union_member(LttEvent *e, LttField *f);
/* These functions extract data from an event after architecture specific
conversions. */
-unsigned ltt_event_get_unsigned(ltt_event *e, ltt_field *f);
+unsigned ltt_event_get_unsigned(LttEvent *e, LttField *f);
-int ltt_event_get_int(ltt_event *e, ltt_field *f);
+int ltt_event_get_int(LttEvent *e, LttField *f);
-unsigned long ltt_event_get_long_unsigned(ltt_event *e, ltt_field *f);
+unsigned long ltt_event_get_long_unsigned(LttEvent *e, LttField *f);
-long int ltt_event_get_long_int(ltt_event *e, ltt_field *f);
+long int ltt_event_get_long_int(LttEvent *e, LttField *f);
-float ltt_event_get_float(ltt_event *e, ltt_field *f);
+float ltt_event_get_float(LttEvent *e, LttField *f);
-double ltt_event_get_double(ltt_event *e, ltt_field *f);
+double ltt_event_get_double(LttEvent *e, LttField *f);
/* The string obtained is only valid until the next read from
the same tracefile. */
-char *ltt_event_get_string(ltt_event *e, ltt_field *f);
+char *ltt_event_get_string(LttEvent *e, LttField *f);
#endif // EVENT_H