#include <papi.h>
int PAPI_list_events(int *EventSet, int *Events, int *number );

EventSet An integer handle for a PAPI event set as created by PAPI_create_eventset
*Events A pointer to a preallocated array of codes for events, such as PAPI_INT_INS. No more than *number codes will be stored into the array.
*number On input, the size of the Events array, or maximum number of event codes to be returned. A value of 0 can be used to probe an event set. On output, the number of events actually in the event set. This value may be greater than the actually stored number of event codes.

PAPI_EINVAL
PAPI_ENOEVST

if (PAPI_event_name_to_code("PAPI_TOT_INS",&EventCode) != PAPI_OK)
exit(1);
if (PAPI_add_event(EventSet, EventCode) != PAPI_OK)
exit(1);
Convert a second event name to an event code 
if (PAPI_event_name_to_code("PAPI_L1_LDM",&EventCode) != PAPI_OK)
exit(1);
if (PAPI_add_event(EventSet, EventCode) != PAPI_OK)
exit(1);
number = 0;
if(PAPI_list_events(EventSet, NULL, &number))
exit(1);
if(number != 2)
exit(1);
if(PAPI_list_events(EventSet, Events, &number))
exit(1);

PAPI_event_code_to_name

PAPI_event_name_to_code

PAPI_add_event

PAPI_create_eventset

#include 'fpapi.h'
PAPI_list_events( C_INT EventSet, C_INT(*) Events, C_INT number, C_INT check )