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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 */
26static struct trace_event tevent;
27static bool tevent_initialized;
28
29int trace_event__init(struct trace_event *t)
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
41static int trace_event__init2(void)
42{
43 int be = traceevent_host_bigendian();
44 struct pevent *pevent;
45
46 if (trace_event__init(&tevent))
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
57int trace_event__register_resolver(struct machine *machine,
58 pevent_func_resolver_t *func)
59{
60 if (!tevent_initialized && trace_event__init2())
61 return -1;
62
63 return pevent_set_function_resolver(tevent.pevent, func, machine);
64}
65
66void trace_event__cleanup(struct trace_event *t)
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 */
75static struct event_format*
76tp_format(const char *sys, const char *name)
77{
78 struct pevent *pevent = tevent.pevent;
79 struct event_format *event = NULL;
80 char path[PATH_MAX];
81 size_t size;
82 char *data;
83 int err;
84
85 scnprintf(path, PATH_MAX, "%s/%s/%s/format",
86 tracing_events_path, sys, name);
87
88 err = filename__read_str(path, &data, &size);
89 if (err)
90 return ERR_PTR(err);
91
92 pevent_parse_format(pevent, &event, data, size, sys);
93
94 free(data);
95 return event;
96}
97
98/*
99 * Returns pointer with encoded error via <linux/err.h> interface.
100 */
101struct event_format*
102trace_event__tp_format(const char *sys, const char *name)
103{
104 if (!tevent_initialized && trace_event__init2())
105 return ERR_PTR(-ENOMEM);
106
107 return tp_format(sys, name);
108}
109
110struct event_format *trace_event__tp_format_id(int id)
111{
112 if (!tevent_initialized && trace_event__init2())
113 return ERR_PTR(-ENOMEM);
114
115 return pevent_find_event(tevent.pevent, id);
116}
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
18/*
19 * global trace_event object used by trace_event__tp_format
20 *
21 * TODO There's no cleanup call for this. Add some sort of
22 * __exit function support and call trace_event__cleanup
23 * there.
24 */
25static struct trace_event tevent;
26static bool tevent_initialized;
27
28int trace_event__init(struct trace_event *t)
29{
30 struct tep_handle *pevent = tep_alloc();
31
32 if (pevent) {
33 t->plugin_list = tep_load_plugins(pevent);
34 t->pevent = pevent;
35 }
36
37 return pevent ? 0 : -1;
38}
39
40static int trace_event__init2(void)
41{
42 int be = tep_is_bigendian();
43 struct tep_handle *pevent;
44
45 if (trace_event__init(&tevent))
46 return -1;
47
48 pevent = tevent.pevent;
49 tep_set_flag(pevent, TEP_NSEC_OUTPUT);
50 tep_set_file_bigendian(pevent, be);
51 tep_set_local_bigendian(pevent, be);
52 tevent_initialized = true;
53 return 0;
54}
55
56int trace_event__register_resolver(struct machine *machine,
57 tep_func_resolver_t *func)
58{
59 if (!tevent_initialized && trace_event__init2())
60 return -1;
61
62 return tep_set_function_resolver(tevent.pevent, func, machine);
63}
64
65void trace_event__cleanup(struct trace_event *t)
66{
67 tep_unload_plugins(t->plugin_list, t->pevent);
68 tep_free(t->pevent);
69}
70
71/*
72 * Returns pointer with encoded error via <linux/err.h> interface.
73 */
74static struct tep_event*
75tp_format(const char *sys, const char *name)
76{
77 char *tp_dir = get_events_file(sys);
78 struct tep_handle *pevent = tevent.pevent;
79 struct tep_event *event = NULL;
80 char path[PATH_MAX];
81 size_t size;
82 char *data;
83 int err;
84
85 if (!tp_dir)
86 return ERR_PTR(-errno);
87
88 scnprintf(path, PATH_MAX, "%s/%s/format", tp_dir, name);
89 put_events_file(tp_dir);
90
91 err = filename__read_str(path, &data, &size);
92 if (err)
93 return ERR_PTR(err);
94
95 tep_parse_format(pevent, &event, data, size, sys);
96
97 free(data);
98 return event;
99}
100
101/*
102 * Returns pointer with encoded error via <linux/err.h> interface.
103 */
104struct tep_event*
105trace_event__tp_format(const char *sys, const char *name)
106{
107 if (!tevent_initialized && trace_event__init2())
108 return ERR_PTR(-ENOMEM);
109
110 return tp_format(sys, name);
111}
112
113struct tep_event *trace_event__tp_format_id(int id)
114{
115 if (!tevent_initialized && trace_event__init2())
116 return ERR_PTR(-ENOMEM);
117
118 return tep_find_event(tevent.pevent, id);
119}