Commit | Line | Data |
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29f5ffd3 | 1 | |
97978b3e JO |
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> | |
8dd2a131 | 10 | #include <linux/err.h> |
29f5ffd3 | 11 | #include <traceevent/event-parse.h> |
592d5a6b | 12 | #include <api/fs/tracing_path.h> |
607bfbd7 | 13 | #include <api/fs/fs.h> |
29f5ffd3 | 14 | #include "trace-event.h" |
c3168b0d | 15 | #include "machine.h" |
97978b3e JO |
16 | #include "util.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 | */ | |
25 | static struct trace_event tevent; | |
c3168b0d | 26 | static bool tevent_initialized; |
29f5ffd3 JO |
27 | |
28 | int trace_event__init(struct trace_event *t) | |
29 | { | |
30 | struct pevent *pevent = pevent_alloc(); | |
31 | ||
32 | if (pevent) { | |
33 | t->plugin_list = traceevent_load_plugins(pevent); | |
34 | t->pevent = pevent; | |
35 | } | |
36 | ||
37 | return pevent ? 0 : -1; | |
38 | } | |
39 | ||
c3168b0d ACM |
40 | static int trace_event__init2(void) |
41 | { | |
42 | int be = traceevent_host_bigendian(); | |
43 | struct pevent *pevent; | |
44 | ||
45 | if (trace_event__init(&tevent)) | |
46 | return -1; | |
47 | ||
48 | pevent = tevent.pevent; | |
49 | pevent_set_flag(pevent, PEVENT_NSEC_OUTPUT); | |
50 | pevent_set_file_bigendian(pevent, be); | |
51 | pevent_set_host_bigendian(pevent, be); | |
52 | tevent_initialized = true; | |
53 | return 0; | |
54 | } | |
55 | ||
959c2199 ACM |
56 | int trace_event__register_resolver(struct machine *machine, |
57 | pevent_func_resolver_t *func) | |
c3168b0d ACM |
58 | { |
59 | if (!tevent_initialized && trace_event__init2()) | |
60 | return -1; | |
61 | ||
959c2199 | 62 | return pevent_set_function_resolver(tevent.pevent, func, machine); |
c3168b0d ACM |
63 | } |
64 | ||
29f5ffd3 JO |
65 | void trace_event__cleanup(struct trace_event *t) |
66 | { | |
8d0c2224 | 67 | traceevent_unload_plugins(t->plugin_list, t->pevent); |
29f5ffd3 | 68 | pevent_free(t->pevent); |
29f5ffd3 | 69 | } |
97978b3e | 70 | |
8dd2a131 JO |
71 | /* |
72 | * Returns pointer with encoded error via <linux/err.h> interface. | |
73 | */ | |
97978b3e JO |
74 | static struct event_format* |
75 | tp_format(const char *sys, const char *name) | |
76 | { | |
77 | struct pevent *pevent = tevent.pevent; | |
78 | struct event_format *event = NULL; | |
79 | char path[PATH_MAX]; | |
80 | size_t size; | |
81 | char *data; | |
8dd2a131 | 82 | int err; |
97978b3e JO |
83 | |
84 | scnprintf(path, PATH_MAX, "%s/%s/%s/format", | |
85 | tracing_events_path, sys, name); | |
86 | ||
8dd2a131 JO |
87 | err = filename__read_str(path, &data, &size); |
88 | if (err) | |
89 | return ERR_PTR(err); | |
97978b3e JO |
90 | |
91 | pevent_parse_format(pevent, &event, data, size, sys); | |
92 | ||
93 | free(data); | |
94 | return event; | |
95 | } | |
96 | ||
8dd2a131 JO |
97 | /* |
98 | * Returns pointer with encoded error via <linux/err.h> interface. | |
99 | */ | |
97978b3e JO |
100 | struct event_format* |
101 | trace_event__tp_format(const char *sys, const char *name) | |
102 | { | |
c3168b0d | 103 | if (!tevent_initialized && trace_event__init2()) |
8dd2a131 | 104 | return ERR_PTR(-ENOMEM); |
97978b3e JO |
105 | |
106 | return tp_format(sys, name); | |
107 | } |