1
2 #include <stdio.h>
3 #include <unistd.h>
4 #include <stdlib.h>
5 #include <errno.h>
6 #include <sys/types.h>
7 #include <sys/stat.h>
8 #include <fcntl.h>
9 #include <linux/kernel.h>
10 #include <traceevent/event-parse.h>
11 #include "trace-event.h"
12 #include "util.h"
13
14 /*
15 * global trace_event object used by trace_event__tp_format
16 *
17 * TODO There's no cleanup call for this. Add some sort of
18 * __exit function support and call trace_event__cleanup
19 * there.
20 */
21 static struct trace_event tevent;
22
trace_event__init(struct trace_event * t)23 int trace_event__init(struct trace_event *t)
24 {
25 struct pevent *pevent = pevent_alloc();
26
27 if (pevent) {
28 t->plugin_list = traceevent_load_plugins(pevent);
29 t->pevent = pevent;
30 }
31
32 return pevent ? 0 : -1;
33 }
34
trace_event__cleanup(struct trace_event * t)35 void trace_event__cleanup(struct trace_event *t)
36 {
37 traceevent_unload_plugins(t->plugin_list, t->pevent);
38 pevent_free(t->pevent);
39 }
40
41 static struct event_format*
tp_format(const char * sys,const char * name)42 tp_format(const char *sys, const char *name)
43 {
44 struct pevent *pevent = tevent.pevent;
45 struct event_format *event = NULL;
46 char path[PATH_MAX];
47 size_t size;
48 char *data;
49
50 scnprintf(path, PATH_MAX, "%s/%s/%s/format",
51 tracing_events_path, sys, name);
52
53 if (filename__read_str(path, &data, &size))
54 return NULL;
55
56 pevent_parse_format(pevent, &event, data, size, sys);
57
58 free(data);
59 return event;
60 }
61
62 struct event_format*
trace_event__tp_format(const char * sys,const char * name)63 trace_event__tp_format(const char *sys, const char *name)
64 {
65 static bool initialized;
66
67 if (!initialized) {
68 int be = traceevent_host_bigendian();
69 struct pevent *pevent;
70
71 if (trace_event__init(&tevent))
72 return NULL;
73
74 pevent = tevent.pevent;
75 pevent_set_flag(pevent, PEVENT_NSEC_OUTPUT);
76 pevent_set_file_bigendian(pevent, be);
77 pevent_set_host_bigendian(pevent, be);
78 initialized = true;
79 }
80
81 return tp_format(sys, name);
82 }
83