Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
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 | |
17 | /* | |
18 | * global trace_event object used by trace_event__tp_format | |
19 | * | |
20 | * TODO There's no cleanup call for this. Add some sort of | |
21 | * __exit function support and call trace_event__cleanup | |
22 | * there. | |
23 | */ | |
24 | static struct trace_event tevent; | |
c3168b0d | 25 | static bool tevent_initialized; |
29f5ffd3 JO |
26 | |
27 | int trace_event__init(struct trace_event *t) | |
28 | { | |
4d5c58b1 | 29 | struct tep_handle *pevent = tep_alloc(); |
29f5ffd3 JO |
30 | |
31 | if (pevent) { | |
fc9b6971 | 32 | t->plugin_list = tep_load_plugins(pevent); |
29f5ffd3 JO |
33 | t->pevent = pevent; |
34 | } | |
35 | ||
36 | return pevent ? 0 : -1; | |
37 | } | |
38 | ||
c3168b0d ACM |
39 | static int trace_event__init2(void) |
40 | { | |
55c34ae0 | 41 | int be = tep_is_bigendian(); |
096177a8 | 42 | struct tep_handle *pevent; |
c3168b0d ACM |
43 | |
44 | if (trace_event__init(&tevent)) | |
45 | return -1; | |
46 | ||
47 | pevent = tevent.pevent; | |
6fed932e | 48 | tep_set_flag(pevent, TEP_NSEC_OUTPUT); |
ece2a4f4 | 49 | tep_set_file_bigendian(pevent, be); |
55c34ae0 | 50 | tep_set_local_bigendian(pevent, be); |
c3168b0d ACM |
51 | tevent_initialized = true; |
52 | return 0; | |
53 | } | |
54 | ||
959c2199 | 55 | int trace_event__register_resolver(struct machine *machine, |
4d5c58b1 | 56 | tep_func_resolver_t *func) |
c3168b0d ACM |
57 | { |
58 | if (!tevent_initialized && trace_event__init2()) | |
59 | return -1; | |
60 | ||
ece2a4f4 | 61 | return tep_set_function_resolver(tevent.pevent, func, machine); |
c3168b0d ACM |
62 | } |
63 | ||
29f5ffd3 JO |
64 | void trace_event__cleanup(struct trace_event *t) |
65 | { | |
fc9b6971 | 66 | tep_unload_plugins(t->plugin_list, t->pevent); |
4d5c58b1 | 67 | tep_free(t->pevent); |
29f5ffd3 | 68 | } |
97978b3e | 69 | |
8dd2a131 JO |
70 | /* |
71 | * Returns pointer with encoded error via <linux/err.h> interface. | |
72 | */ | |
97fbf3f0 | 73 | static struct tep_event* |
97978b3e JO |
74 | tp_format(const char *sys, const char *name) |
75 | { | |
25a7d914 | 76 | char *tp_dir = get_events_file(sys); |
096177a8 | 77 | struct tep_handle *pevent = tevent.pevent; |
97fbf3f0 | 78 | struct tep_event *event = NULL; |
97978b3e JO |
79 | char path[PATH_MAX]; |
80 | size_t size; | |
81 | char *data; | |
8dd2a131 | 82 | int err; |
97978b3e | 83 | |
25a7d914 ACM |
84 | if (!tp_dir) |
85 | return ERR_PTR(-errno); | |
86 | ||
87 | scnprintf(path, PATH_MAX, "%s/%s/format", tp_dir, name); | |
88 | put_events_file(tp_dir); | |
97978b3e | 89 | |
8dd2a131 JO |
90 | err = filename__read_str(path, &data, &size); |
91 | if (err) | |
92 | return ERR_PTR(err); | |
97978b3e | 93 | |
c60167c1 | 94 | tep_parse_format(pevent, &event, data, size, sys); |
97978b3e JO |
95 | |
96 | free(data); | |
97 | return event; | |
98 | } | |
99 | ||
8dd2a131 JO |
100 | /* |
101 | * Returns pointer with encoded error via <linux/err.h> interface. | |
102 | */ | |
97fbf3f0 | 103 | struct tep_event* |
97978b3e JO |
104 | trace_event__tp_format(const char *sys, const char *name) |
105 | { | |
c3168b0d | 106 | if (!tevent_initialized && trace_event__init2()) |
8dd2a131 | 107 | return ERR_PTR(-ENOMEM); |
97978b3e JO |
108 | |
109 | return tp_format(sys, name); | |
110 | } | |
71fe1052 | 111 | |
97fbf3f0 | 112 | struct tep_event *trace_event__tp_format_id(int id) |
71fe1052 JO |
113 | { |
114 | if (!tevent_initialized && trace_event__init2()) | |
115 | return ERR_PTR(-ENOMEM); | |
116 | ||
af85cd19 | 117 | return tep_find_event(tevent.pevent, id); |
71fe1052 | 118 | } |