Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
29f5ffd3 | 2 | |
97978b3e JO |
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> | |
8dd2a131 | 11 | #include <linux/err.h> |
29f5ffd3 | 12 | #include <traceevent/event-parse.h> |
592d5a6b | 13 | #include <api/fs/tracing_path.h> |
607bfbd7 | 14 | #include <api/fs/fs.h> |
29f5ffd3 | 15 | #include "trace-event.h" |
c3168b0d | 16 | #include "machine.h" |
97978b3e JO |
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; | |
c3168b0d | 27 | static bool tevent_initialized; |
29f5ffd3 JO |
28 | |
29 | int 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 | ||
c3168b0d ACM |
41 | static 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 | ||
959c2199 ACM |
57 | int trace_event__register_resolver(struct machine *machine, |
58 | pevent_func_resolver_t *func) | |
c3168b0d ACM |
59 | { |
60 | if (!tevent_initialized && trace_event__init2()) | |
61 | return -1; | |
62 | ||
959c2199 | 63 | return pevent_set_function_resolver(tevent.pevent, func, machine); |
c3168b0d ACM |
64 | } |
65 | ||
29f5ffd3 JO |
66 | void trace_event__cleanup(struct trace_event *t) |
67 | { | |
8d0c2224 | 68 | traceevent_unload_plugins(t->plugin_list, t->pevent); |
29f5ffd3 | 69 | pevent_free(t->pevent); |
29f5ffd3 | 70 | } |
97978b3e | 71 | |
8dd2a131 JO |
72 | /* |
73 | * Returns pointer with encoded error via <linux/err.h> interface. | |
74 | */ | |
97978b3e JO |
75 | static struct event_format* |
76 | tp_format(const char *sys, const char *name) | |
77 | { | |
25a7d914 | 78 | char *tp_dir = get_events_file(sys); |
97978b3e JO |
79 | struct pevent *pevent = tevent.pevent; |
80 | struct event_format *event = NULL; | |
81 | char path[PATH_MAX]; | |
82 | size_t size; | |
83 | char *data; | |
8dd2a131 | 84 | int err; |
97978b3e | 85 | |
25a7d914 ACM |
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); | |
97978b3e | 91 | |
8dd2a131 JO |
92 | err = filename__read_str(path, &data, &size); |
93 | if (err) | |
94 | return ERR_PTR(err); | |
97978b3e JO |
95 | |
96 | pevent_parse_format(pevent, &event, data, size, sys); | |
97 | ||
98 | free(data); | |
99 | return event; | |
100 | } | |
101 | ||
8dd2a131 JO |
102 | /* |
103 | * Returns pointer with encoded error via <linux/err.h> interface. | |
104 | */ | |
97978b3e JO |
105 | struct event_format* |
106 | trace_event__tp_format(const char *sys, const char *name) | |
107 | { | |
c3168b0d | 108 | if (!tevent_initialized && trace_event__init2()) |
8dd2a131 | 109 | return ERR_PTR(-ENOMEM); |
97978b3e JO |
110 | |
111 | return tp_format(sys, name); | |
112 | } | |
71fe1052 JO |
113 | |
114 | struct event_format *trace_event__tp_format_id(int id) | |
115 | { | |
116 | if (!tevent_initialized && trace_event__init2()) | |
117 | return ERR_PTR(-ENOMEM); | |
118 | ||
119 | return pevent_find_event(tevent.pevent, id); | |
120 | } |