blob: ab06a82765f05f5ae6d2a5ec31c90c9b245634be [file] [log] [blame]
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <fcntl.h>
#include <linux/kernel.h>
#include "event-parse.h"
#include "trace_event.h"
#define PATH_MAX 4096
char tracing_events_path[PATH_MAX + 1] = "/sys/kernel/debug/tracing/events";
/*
* global trace_event object used by trace_event__tp_format
*
* TODO There's no cleanup call for this. Add some sort of
* __exit function support and call trace_event__cleanup
* there.
*/
static struct trace_event tevent;
int trace_event__init(struct trace_event *t)
{
struct pevent *pevent = pevent_alloc();
if (pevent) {
/*t->plugin_list = traceevent_load_plugins(pevent);*/
t->pevent = pevent;
}
return pevent ? 0 : -1;
}
void trace_event__cleanup(struct trace_event *t)
{
/*traceevent_unload_plugins(t->plugin_list, t->pevent);*/
pevent_free(t->pevent);
}
static struct event_format*
tp_format(const char *sys, const char *name)
{
struct pevent *pevent = tevent.pevent;
struct event_format *event = NULL;
char path[PATH_MAX];
size_t size;
char *data;
scnprintf(path, PATH_MAX, "%s/%s/%s/format",
tracing_events_path, sys, name);
if (filename__read_str(path, &data, &size))
return NULL;
pevent_parse_format(pevent, &event, data, size, sys);
free(data);
return event;
}
struct event_format*
trace_event__tp_format(const char *sys, const char *name)
{
static bool initialized;
if (!initialized) {
int be = traceevent_host_bigendian();
struct pevent *pevent;
if (trace_event__init(&tevent))
return NULL;
pevent = tevent.pevent;
pevent_set_flag(pevent, PEVENT_NSEC_OUTPUT);
pevent_set_file_bigendian(pevent, be);
pevent_set_host_bigendian(pevent, be);
initialized = true;
}
return tp_format(sys, name);
}
void event_format__print(struct event_format *event,
int cpu, void *data, int size)
{
struct pevent_record record;
struct trace_seq s;
memset(&record, 0, sizeof(record));
record.cpu = cpu;
record.size = size;
record.data = data;
printf("%s:%s: ", event->system, event->name);
trace_seq_init(&s);
pevent_event_info(&s, event, &record);
trace_seq_do_printf(&s);
trace_seq_destroy(&s);
printf("\n");
}