SYSEVENT_GET_CLASS_NAME(3SYSEVENT) System Event Library Functions


NAME


sysevent_get_class_name, sysevent_get_subclass_name, sysevent_get_size,
sysevent_get_seq, sysevent_get_time - get class name, subclass name, ID
or buffer size of event

SYNOPSIS


cc [flag...] file... -lsysevent [library...]
#include <libsysevent.h>

char *sysevent_get_class_name(sysevent_t *ev);


char *sysevent_get_subclass_name(sysevent_t *ev);


int sysevent_get_size(sysevent_t *ev);


uint64_t sysevent_get_seq(sysevent_t *ev);


void sysevent_get_time(sysevent_t *ev, hrtime_t *etimep);


PARAMETERS


ev
handle to event


etimep
pointer to high resolution event time variable


DESCRIPTION


The sysevent_get_class_name() and sysevent_get_subclass_name() functions
return, respectively, the class and subclass names for the provided event
ev.


The sysevent_get_size() function returns the size of the event buffer,
ev.


The sysevent_get_seq() function returns a unique event sequence number of
event ev. The sequence number is reset on every system boot.


The sysevent_get_time() function writes the time the event was published
into the variable pointed to by etimep. The event time is added to the
event just before it is put into the kernel internal event queue.

EXAMPLES


Example 1: Parse sysevent header information.




The following example parses sysevent header information from an
application's event handler.


hrtime_t last_ev_time;
unit64_t last_ev_seq;

void
event_handler(sysevent_t *ev)
{
sysevent_t *new_ev;
int ev_sz;
hrtime_t ev_time;
uint64_t ev_seq;


/* Filter on class and subclass */
if (strcmp(EC_PRIV, sysevent_get_class_name(ev)) != 0) {
return;
} else if (strcmp("ESC_MYSUBCLASS,
sysevent_get_subclass_name(ev)) != 0) {
return;
}

/*
* Check for replayed sysevent, time must
* be greater than previously recorded.
*/
sysevent_get_event_time(ev, &ev_time);
ev_seq = sysevent_get_seq(ev);
if (ev_time < last_ev_time ||
(ev_time == last_ev_time && ev_seq <=
last_ev_seq)) {
return;
}

last_ev_time = ev_time;
last_ev_seq = ev_seq;

/* Store event for later processing */
ev_sz = sysevent_get_size(ev):
new_ev (sysevent_t *)malloc(ev_sz);
bcopy(ev, new_ev, ev_sz);
queue_event(new_ev);
}


ATTRIBUTES


See attributes(5) for descriptions of the following attributes:


+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Committed |
+--------------------+-----------------+
|MT-Level | MT-Safe |
+--------------------+-----------------+

SEE ALSO


attributes(5)

NOTES


The libsysevent interfaces do not work at all in non-global zones.


July 24, 2009
SYSEVENT_GET_CLASS_NAME(3SYSEVENT)