Linux Perf
trace-event.c
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1 // SPDX-License-Identifier: GPL-2.0
2 
3 #include <stdio.h>
4 #include <unistd.h>
5 #include <stdlib.h>
6 #include <errno.h>
7 #include <sys/types.h>
8 #include <sys/stat.h>
9 #include <fcntl.h>
10 #include <linux/kernel.h>
11 #include <linux/err.h>
12 #include <traceevent/event-parse.h>
13 #include <api/fs/tracing_path.h>
14 #include <api/fs/fs.h>
15 #include "trace-event.h"
16 #include "machine.h"
17 #include "util.h"
18 
19 /*
20  * global trace_event object used by trace_event__tp_format
21  *
22  * TODO There's no cleanup call for this. Add some sort of
23  * __exit function support and call trace_event__cleanup
24  * there.
25  */
26 static struct trace_event tevent;
27 static bool tevent_initialized;
28 
30 {
31  struct pevent *pevent = pevent_alloc();
32 
33  if (pevent) {
34  t->plugin_list = traceevent_load_plugins(pevent);
35  t->pevent = pevent;
36  }
37 
38  return pevent ? 0 : -1;
39 }
40 
41 static int trace_event__init2(void)
42 {
43  int be = traceevent_host_bigendian();
44  struct pevent *pevent;
45 
47  return -1;
48 
49  pevent = tevent.pevent;
50  pevent_set_flag(pevent, PEVENT_NSEC_OUTPUT);
51  pevent_set_file_bigendian(pevent, be);
52  pevent_set_host_bigendian(pevent, be);
53  tevent_initialized = true;
54  return 0;
55 }
56 
58  pevent_func_resolver_t *func)
59 {
61  return -1;
62 
63  return pevent_set_function_resolver(tevent.pevent, func, machine);
64 }
65 
67 {
68  traceevent_unload_plugins(t->plugin_list, t->pevent);
69  pevent_free(t->pevent);
70 }
71 
72 /*
73  * Returns pointer with encoded error via <linux/err.h> interface.
74  */
75 static struct event_format*
76 tp_format(const char *sys, const char *name)
77 {
78  char *tp_dir = get_events_file(sys);
79  struct pevent *pevent = tevent.pevent;
80  struct event_format *event = NULL;
81  char path[PATH_MAX];
82  size_t size;
83  char *data;
84  int err;
85 
86  if (!tp_dir)
87  return ERR_PTR(-errno);
88 
89  scnprintf(path, PATH_MAX, "%s/%s/format", tp_dir, name);
90  put_events_file(tp_dir);
91 
92  err = filename__read_str(path, &data, &size);
93  if (err)
94  return ERR_PTR(err);
95 
96  pevent_parse_format(pevent, &event, data, size, sys);
97 
98  free(data);
99  return event;
100 }
101 
102 /*
103  * Returns pointer with encoded error via <linux/err.h> interface.
104  */
105 struct event_format*
106 trace_event__tp_format(const char *sys, const char *name)
107 {
109  return ERR_PTR(-ENOMEM);
110 
111  return tp_format(sys, name);
112 }
113 
114 struct event_format *trace_event__tp_format_id(int id)
115 {
117  return ERR_PTR(-ENOMEM);
118 
119  return pevent_find_event(tevent.pevent, id);
120 }
struct event_format * trace_event__tp_format(const char *sys, const char *name)
Definition: trace-event.c:106
static int trace_event__init2(void)
Definition: trace-event.c:41
static bool tevent_initialized
Definition: trace-event.c:27
size_t size
Definition: evsel.c:60
int(* func)(void)
Definition: clang.c:9
int trace_event__register_resolver(struct machine *machine, pevent_func_resolver_t *func)
Definition: trace-event.c:57
dictionary data
Definition: stat-cpi.py:4
int int err
Definition: 5sec.c:44
static struct trace_event tevent
Definition: trace-event.c:26
const char * name
int trace_event__init(struct trace_event *t)
Definition: trace-event.c:29
void trace_event__cleanup(struct trace_event *t)
Definition: trace-event.c:66
#define PATH_MAX
Definition: jevents.c:1042
#define event
struct event_format * trace_event__tp_format_id(int id)
Definition: trace-event.c:114
struct plugin_list * plugin_list
Definition: trace-event.h:17
void free(void *)
struct pevent * pevent
Definition: trace-event.h:16
static struct event_format * tp_format(const char *sys, const char *name)
Definition: trace-event.c:76