#include <papi.h>
const PAPI_component_info_t *PAPI_get_component_info(int  cidx );

 const PAPI_component_info_t *cmpinfo = NULL;
if (PAPI_library_init(PAPI_VER_CURRENT) != PAPI_VER_CURRENT)
exit(1);
if ((cmpinfo = PAPI_get_component_info(0)) == NULL)
exit(1);
printf("This component supports %d Preset Events and %d Native events.\n",
cmpinfo->num_preset_events, cmpinfo->num_native_events);

 
typedef struct _papi_component_option {
char name[PAPI_MAX_STR_LEN];		/* Name of the component we're using, usually CVS RCS Id */
char version[PAPI_MIN_STR_LEN];		/* Version of this component, usually CVS Revision */
char support_version[PAPI_MIN_STR_LEN];	/* Version of the support library */
char kernel_version[PAPI_MIN_STR_LEN];	/* Version of the kernel PMC support driver */
int CmpIdx;				/* Index into the vector array for this component; set at init time */
int num_cntrs;				/* Number of hardware counters the substrate supports */
int num_mpx_cntrs;				/* Number of multiplexed hardware counters the substrate or PAPI support: PAPI_MPX_DEF_DEG */
int num_preset_events;			/* Number of preset events the substrate supports */
int num_native_events;			/* Number of native events the substrate supports */
int default_domain;			/* The default domain when this substrate is used: PAPI_DOM_USER */
int available_domains;			/* Available domains; default: .default_domain */
int default_granularity;			/* The default granularity when this substrate is used: PAPI_GRN_THR */
int available_granularities;		/* Available granularities; default:.default_granularity */
int hardware_intr_sig;			/* Signal used by hardware to deliver PMC events: PAPI_SIGNAL */
int opcode_match_width;			/* Width of opcode matcher if exists, 0 if not */
int reserved_ints[4];
unsigned int hardware_intr:1;		/* hw overflow intr, does not need to be emulated in software*/
unsigned int precise_intr:1;		/* Performance interrupts happen precisely */
unsigned int posix1b_timers:1;		/* Using POSIX 1b interval timers (timer_create) instead of setitimer */
unsigned int kernel_profile:1;		/* Has kernel profiling support (buffered interrupts or sprofil-like) */
unsigned int kernel_multiplex:1;		/* In kernel multiplexing */
unsigned int data_address_range:1;		/* Supports data address range limiting */
unsigned int instr_address_range:1;	/* Supports instruction address range limiting */
unsigned int fast_counter_read:1;		/* Supports a user level PMC read instruction */
unsigned int fast_real_timer:1;		/* Supports a fast real timer */
unsigned int fast_virtual_timer:1;		/* Supports a fast virtual timer */
unsigned int attach:1;			/* Supports attach */
unsigned int attach_must_ptrace:1;		/* Attach must first ptrace and stop the thread/process*/
unsigned int edge_detect:1;		/* Supports edge detection on events */
unsigned int invert:1;			/* Supports invert detection on events */
unsigned int profile_ear:1;		/* Supports data/instr/tlb miss address sampling */
unsigned int grouped_cntrs:1;		/* Underlying hardware uses counter groups */
unsigned int reserved_bits:16;
} PAPI_component_info_t;