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8020ceb5 | 1 | /* |
c0c0989a | 2 | * SPDX-License-Identifier: MIT |
8020ceb5 | 3 | * |
c0c0989a | 4 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
8020ceb5 MD |
5 | * |
6 | * Holds LTTng per-session event registry. | |
8020ceb5 MD |
7 | */ |
8 | ||
c0c0989a MJ |
9 | #ifndef _LTTNG_UST_EVENTS_H |
10 | #define _LTTNG_UST_EVENTS_H | |
11 | ||
9f3fdbc6 | 12 | #include <urcu/list.h> |
1f18504e | 13 | #include <urcu/hlist.h> |
b4051ad8 | 14 | #include <stddef.h> |
9f3fdbc6 | 15 | #include <stdint.h> |
4318ae1b MD |
16 | #include <lttng/ust-abi.h> |
17 | #include <lttng/ust-tracer.h> | |
2ae57758 | 18 | #include <lttng/ust-endian.h> |
20f1eee7 | 19 | #include <float.h> |
d58d1454 MD |
20 | #include <errno.h> |
21 | #include <urcu/ref.h> | |
22 | #include <pthread.h> | |
8020ceb5 | 23 | |
6453d237 MD |
24 | #ifdef __cplusplus |
25 | extern "C" { | |
26 | #endif | |
27 | ||
19d8b1b3 MD |
28 | #define LTTNG_UST_UUID_LEN 16 |
29 | ||
71d31690 MD |
30 | /* |
31 | * Tracepoint provider version. Compatibility based on the major number. | |
32 | * Older tracepoint providers can always register to newer lttng-ust | |
33 | * library, but the opposite is rejected: a newer tracepoint provider is | |
34 | * rejected by an older lttng-ust library. | |
35 | */ | |
04f0b55a | 36 | #define LTTNG_UST_PROVIDER_MAJOR 2 |
71d31690 MD |
37 | #define LTTNG_UST_PROVIDER_MINOR 0 |
38 | ||
e7bc0ef6 | 39 | struct lttng_ust_channel_buffer; |
f69fe5fb | 40 | struct lttng_ust_session; |
4cfec15c | 41 | struct lttng_ust_lib_ring_buffer_ctx; |
25cff019 | 42 | struct lttng_ust_event_field; |
8020ceb5 | 43 | |
37d5e202 MD |
44 | /* |
45 | * Data structures used by tracepoint event declarations, and by the | |
a084756d | 46 | * tracer. |
37d5e202 MD |
47 | */ |
48 | ||
8020ceb5 MD |
49 | /* Type description */ |
50 | ||
a084756d MD |
51 | enum lttng_ust_type { |
52 | lttng_ust_type_integer, | |
53 | lttng_ust_type_string, | |
54 | lttng_ust_type_float, | |
55 | lttng_ust_type_dynamic, | |
56 | lttng_ust_type_enum, | |
57 | lttng_ust_type_array, | |
58 | lttng_ust_type_sequence, | |
59 | lttng_ust_type_struct, | |
60 | NR_LTTNG_UST_TYPE, | |
8020ceb5 MD |
61 | }; |
62 | ||
a084756d MD |
63 | enum lttng_ust_string_encoding { |
64 | lttng_ust_string_encoding_none = 0, | |
65 | lttng_ust_string_encoding_UTF8 = 1, | |
66 | lttng_ust_string_encoding_ASCII = 2, | |
67 | NR_LTTNG_UST_STRING_ENCODING, | |
8020ceb5 MD |
68 | }; |
69 | ||
1a37a873 | 70 | struct lttng_ust_enum_value { |
a6f80644 MD |
71 | unsigned long long value; |
72 | unsigned int signedness:1; | |
73 | }; | |
74 | ||
1a37a873 MD |
75 | enum lttng_ust_enum_entry_option { |
76 | LTTNG_UST_ENUM_ENTRY_OPTION_IS_AUTO = 1U << 0, | |
3e762260 PP |
77 | }; |
78 | ||
891d6b55 MD |
79 | /* |
80 | * Enumeration entry description | |
81 | * | |
82 | * IMPORTANT: this structure is part of the ABI between the probe and | |
83 | * UST. Fields need to be only added at the end, never reordered, never | |
84 | * removed. | |
85 | * | |
86 | * The field @struct_size should be used to determine the size of the | |
87 | * structure. It should be queried before using additional fields added | |
88 | * at the end of the structure. | |
89 | */ | |
90 | ||
91 | struct lttng_ust_enum_entry { | |
92 | uint32_t struct_size; | |
93 | ||
1a37a873 | 94 | struct lttng_ust_enum_value start, end; /* start and end are inclusive */ |
8020ceb5 | 95 | const char *string; |
891d6b55 MD |
96 | unsigned int options; |
97 | ||
98 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
8020ceb5 MD |
99 | }; |
100 | ||
a084756d MD |
101 | /* |
102 | * struct lttng_ust_type_common is fixed-size. Its children inherits | |
103 | * from it by embedding struct lttng_ust_type_common as its first field. | |
104 | */ | |
105 | struct lttng_ust_type_common { | |
106 | enum lttng_ust_type type; | |
107 | }; | |
108 | ||
109 | struct lttng_ust_type_integer { | |
110 | struct lttng_ust_type_common parent; | |
111 | uint32_t struct_size; | |
8020ceb5 MD |
112 | unsigned int size; /* in bits */ |
113 | unsigned short alignment; /* in bits */ | |
114 | unsigned int signedness:1; | |
115 | unsigned int reverse_byte_order:1; | |
116 | unsigned int base; /* 2, 8, 10, 16, for pretty print */ | |
a084756d MD |
117 | }; |
118 | ||
119 | #define lttng_ust_type_integer_define(_type, _byte_order, _base) \ | |
120 | ((struct lttng_ust_type_common *) __LTTNG_COMPOUND_LITERAL(struct lttng_ust_type_integer, { \ | |
121 | .parent = { \ | |
122 | .type = lttng_ust_type_integer, \ | |
123 | }, \ | |
124 | .struct_size = sizeof(struct lttng_ust_type_integer), \ | |
125 | .size = sizeof(_type) * CHAR_BIT, \ | |
126 | .alignment = lttng_alignof(_type) * CHAR_BIT, \ | |
127 | .signedness = lttng_is_signed_type(_type), \ | |
128 | .reverse_byte_order = _byte_order != BYTE_ORDER, \ | |
129 | .base = _base, \ | |
130 | })) | |
131 | ||
132 | struct lttng_ust_type_float { | |
133 | struct lttng_ust_type_common parent; | |
134 | uint32_t struct_size; | |
135 | unsigned int exp_dig; /* exponent digits, in bits */ | |
136 | unsigned int mant_dig; /* mantissa digits, in bits */ | |
137 | unsigned short alignment; /* in bits */ | |
138 | unsigned int reverse_byte_order:1; | |
8020ceb5 MD |
139 | }; |
140 | ||
d3ed854b MD |
141 | /* |
142 | * Only float and double are supported. long double is not supported at | |
143 | * the moment. | |
144 | */ | |
89080a49 | 145 | #define lttng_ust_float_mant_dig(_type) \ |
20f1eee7 MD |
146 | (sizeof(_type) == sizeof(float) ? FLT_MANT_DIG \ |
147 | : (sizeof(_type) == sizeof(double) ? DBL_MANT_DIG \ | |
d3ed854b | 148 | : 0)) |
20f1eee7 | 149 | |
a084756d MD |
150 | #define lttng_ust_type_float_define(_type) \ |
151 | ((struct lttng_ust_type_common *) __LTTNG_COMPOUND_LITERAL(struct lttng_ust_type_float, { \ | |
152 | .parent = { \ | |
153 | .type = lttng_ust_type_float, \ | |
154 | }, \ | |
155 | .struct_size = sizeof(struct lttng_ust_type_float), \ | |
156 | .exp_dig = sizeof(_type) * CHAR_BIT \ | |
89080a49 MD |
157 | - lttng_ust_float_mant_dig(_type), \ |
158 | .mant_dig = lttng_ust_float_mant_dig(_type), \ | |
a084756d MD |
159 | .alignment = lttng_alignof(_type) * CHAR_BIT, \ |
160 | .reverse_byte_order = BYTE_ORDER != FLOAT_WORD_ORDER, \ | |
161 | })) | |
162 | ||
163 | ||
164 | struct lttng_ust_type_string { | |
165 | struct lttng_ust_type_common parent; | |
166 | uint32_t struct_size; | |
167 | enum lttng_ust_string_encoding encoding; | |
20f1eee7 MD |
168 | }; |
169 | ||
a084756d MD |
170 | struct lttng_ust_type_enum { |
171 | struct lttng_ust_type_common parent; | |
172 | uint32_t struct_size; | |
173 | struct lttng_ust_enum_desc *desc; /* Enumeration mapping */ | |
174 | struct lttng_ust_type_common *container_type; | |
175 | }; | |
176 | ||
177 | struct lttng_ust_type_array { | |
178 | struct lttng_ust_type_common parent; | |
179 | uint32_t struct_size; | |
180 | struct lttng_ust_type_common *elem_type; | |
181 | unsigned int length; /* Num. elems. */ | |
182 | unsigned int alignment; | |
183 | enum lttng_ust_string_encoding encoding; | |
184 | }; | |
185 | ||
186 | struct lttng_ust_type_sequence { | |
187 | struct lttng_ust_type_common parent; | |
188 | uint32_t struct_size; | |
189 | const char *length_name; /* Length field name. */ | |
190 | struct lttng_ust_type_common *elem_type; | |
191 | unsigned int alignment; /* Alignment before elements. */ | |
192 | enum lttng_ust_string_encoding encoding; | |
193 | }; | |
194 | ||
195 | struct lttng_ust_type_struct { | |
196 | struct lttng_ust_type_common parent; | |
197 | uint32_t struct_size; | |
198 | unsigned int nr_fields; | |
199 | struct lttng_ust_event_field **fields; /* Array of pointers to fields. */ | |
200 | unsigned int alignment; | |
8020ceb5 MD |
201 | }; |
202 | ||
891d6b55 MD |
203 | /* |
204 | * Enumeration description | |
205 | * | |
206 | * IMPORTANT: this structure is part of the ABI between the probe and | |
207 | * UST. Fields need to be only added at the end, never reordered, never | |
208 | * removed. | |
209 | * | |
210 | * The field @struct_size should be used to determine the size of the | |
211 | * structure. It should be queried before using additional fields added | |
212 | * at the end of the structure. | |
213 | */ | |
214 | ||
215 | struct lttng_ust_enum_desc { | |
216 | uint32_t struct_size; | |
217 | ||
8020ceb5 | 218 | const char *name; |
a084756d | 219 | struct lttng_ust_enum_entry **entries; |
c785c634 | 220 | unsigned int nr_entries; |
891d6b55 MD |
221 | |
222 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
8020ceb5 MD |
223 | }; |
224 | ||
180901e6 MD |
225 | /* |
226 | * Event field description | |
227 | * | |
228 | * IMPORTANT: this structure is part of the ABI between the probe and | |
229 | * UST. Fields need to be only added at the end, never reordered, never | |
230 | * removed. | |
25cff019 MD |
231 | * |
232 | * The field @struct_size should be used to determine the size of the | |
233 | * structure. It should be queried before using additional fields added | |
234 | * at the end of the structure. | |
180901e6 | 235 | */ |
8020ceb5 | 236 | |
25cff019 MD |
237 | struct lttng_ust_event_field { |
238 | uint32_t struct_size; | |
239 | ||
8020ceb5 | 240 | const char *name; |
a084756d | 241 | struct lttng_ust_type_common *type; |
25cff019 MD |
242 | unsigned int nowrite:1, /* do not write into trace */ |
243 | nofilter:1; /* do not consider for filter */ | |
244 | ||
245 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
8020ceb5 MD |
246 | }; |
247 | ||
37d5e202 | 248 | |
dc11f93f MD |
249 | /* |
250 | * IMPORTANT: this structure is part of the ABI between the probe and | |
251 | * UST. Fields need to be only added at the end, never reordered, never | |
252 | * removed. | |
253 | * | |
254 | * The field @struct_size should be used to determine the size of the | |
255 | * structure. It should be queried before using additional fields added | |
256 | * at the end of the structure. | |
257 | */ | |
258 | struct lttng_ust_event_desc { | |
259 | uint32_t struct_size; /* Size of this structure. */ | |
dc177d11 | 260 | |
5b4c6da4 MD |
261 | const char *event_name; |
262 | struct lttng_ust_probe_desc *probe_desc; | |
fbdeb5ec | 263 | void (*probe_callback)(void); |
a084756d MD |
264 | struct lttng_event_ctx *ctx; /* context */ |
265 | struct lttng_ust_event_field **fields; /* event payload */ | |
37d5e202 MD |
266 | unsigned int nr_fields; |
267 | const int **loglevel; | |
dc11f93f MD |
268 | const char *signature; /* Argument types/names received */ |
269 | const char **model_emf_uri; | |
270 | ||
271 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
37d5e202 MD |
272 | }; |
273 | ||
dc11f93f MD |
274 | /* |
275 | * IMPORTANT: this structure is part of the ABI between the probe and | |
276 | * UST. Fields need to be only added at the end, never reordered, never | |
277 | * removed. | |
278 | * | |
279 | * The field @struct_size should be used to determine the size of the | |
280 | * structure. It should be queried before using additional fields added | |
281 | * at the end of the structure. | |
282 | */ | |
283 | struct lttng_ust_probe_desc { | |
284 | uint32_t struct_size; /* Size of this structure. */ | |
285 | ||
5b4c6da4 | 286 | const char *provider_name; |
a084756d | 287 | struct lttng_ust_event_desc **event_desc; |
37d5e202 MD |
288 | unsigned int nr_events; |
289 | struct cds_list_head head; /* chain registered probes */ | |
6715d7d1 MD |
290 | struct cds_list_head lazy_init_head; |
291 | int lazy; /* lazy registration */ | |
71d31690 MD |
292 | uint32_t major; |
293 | uint32_t minor; | |
dc11f93f MD |
294 | |
295 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
8020ceb5 MD |
296 | }; |
297 | ||
37d5e202 MD |
298 | /* Data structures used by the tracer. */ |
299 | ||
8020ceb5 | 300 | /* |
7dd08bec MD |
301 | * lttng_event structure is referred to by the tracing fast path. It |
302 | * must be kept small. | |
180901e6 MD |
303 | * |
304 | * IMPORTANT: this structure is part of the ABI between the probe and | |
305 | * UST. Fields need to be only added at the end, never reordered, never | |
306 | * removed. | |
8020ceb5 | 307 | */ |
68bb7559 | 308 | |
daacdbfc | 309 | struct lttng_ust_ctx; |
80333dfa MD |
310 | struct lttng_ust_event_common_private; |
311 | ||
808edfc8 MD |
312 | enum lttng_ust_event_type { |
313 | LTTNG_UST_EVENT_TYPE_RECORDER = 0, | |
314 | LTTNG_UST_EVENT_TYPE_NOTIFIER = 1, | |
315 | }; | |
316 | ||
a2e4d05e MD |
317 | /* |
318 | * Result of the run_filter() callback. | |
319 | */ | |
320 | enum lttng_ust_event_filter_result { | |
321 | LTTNG_UST_EVENT_FILTER_ACCEPT = 0, | |
322 | LTTNG_UST_EVENT_FILTER_REJECT = 1, | |
323 | }; | |
324 | ||
93cfd247 | 325 | /* |
6d35572a MD |
326 | * IMPORTANT: this structure is part of the ABI between the probe and |
327 | * UST. Fields need to be only added at the end, never reordered, never | |
328 | * removed. | |
329 | * | |
93cfd247 MD |
330 | * struct lttng_ust_event_common is the common ancestor of the various |
331 | * public event actions. Inheritance is done by composition: The parent | |
332 | * has a pointer to its child, and the child has a pointer to its | |
333 | * parent. Inheritance of those public structures is done by composition | |
334 | * to ensure both parent and child structures can be extended. | |
335 | * | |
336 | * The field @struct_size should be used to determine the size of the | |
337 | * structure. It should be queried before using additional fields added | |
338 | * at the end of the structure. | |
339 | */ | |
7ee76145 | 340 | struct lttng_ust_event_common { |
80333dfa | 341 | uint32_t struct_size; /* Size of this structure. */ |
dc177d11 | 342 | |
80333dfa MD |
343 | struct lttng_ust_event_common_private *priv; /* Private event interface */ |
344 | ||
808edfc8 | 345 | enum lttng_ust_event_type type; |
ba99fbe2 MD |
346 | void *child; /* Pointer to child, for inheritance by aggregation. */ |
347 | ||
80333dfa | 348 | int enabled; |
a2e4d05e MD |
349 | int eval_filter; /* Need to evaluate filters */ |
350 | int (*run_filter)(struct lttng_ust_event_common *event, | |
351 | const char *stack_data, | |
352 | void *filter_ctx); | |
93cfd247 MD |
353 | |
354 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
80333dfa MD |
355 | }; |
356 | ||
2e70391c | 357 | struct lttng_ust_event_recorder_private; |
68bb7559 | 358 | |
93cfd247 | 359 | /* |
6d35572a MD |
360 | * IMPORTANT: this structure is part of the ABI between the probe and |
361 | * UST. Fields need to be only added at the end, never reordered, never | |
362 | * removed. | |
363 | * | |
93cfd247 MD |
364 | * struct lttng_ust_event_recorder is the action for recording events |
365 | * into a ring buffer. It inherits from struct lttng_ust_event_common | |
366 | * by composition to ensure both parent and child structure are | |
367 | * extensible. | |
368 | * | |
369 | * The field @struct_size should be used to determine the size of the | |
370 | * structure. It should be queried before using additional fields added | |
371 | * at the end of the structure. | |
372 | */ | |
2e70391c MD |
373 | struct lttng_ust_event_recorder { |
374 | uint32_t struct_size; /* Size of this structure. */ | |
dc177d11 | 375 | |
ba99fbe2 | 376 | struct lttng_ust_event_common *parent; /* Inheritance by aggregation. */ |
2e70391c | 377 | struct lttng_ust_event_recorder_private *priv; /* Private event record interface */ |
68bb7559 | 378 | |
8020ceb5 | 379 | unsigned int id; |
e7bc0ef6 | 380 | struct lttng_ust_channel_buffer *chan; |
93cfd247 MD |
381 | |
382 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
8020ceb5 MD |
383 | }; |
384 | ||
a2e4d05e MD |
385 | /* |
386 | * IMPORTANT: this structure is part of the ABI between the probe and | |
387 | * UST. Fields need to be only added at the end, never reordered, never | |
388 | * removed. | |
389 | * | |
390 | * The field @struct_size should be used to determine the size of the | |
391 | * structure. It should be queried before using additional fields added | |
392 | * at the end of the structure. | |
393 | */ | |
394 | struct lttng_ust_notification_ctx { | |
395 | uint32_t struct_size; /* Size of this structure. */ | |
396 | int eval_capture; /* Capture evaluation available. */ | |
397 | ||
398 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
399 | }; | |
400 | ||
115db533 MD |
401 | struct lttng_ust_event_notifier_private; |
402 | ||
93cfd247 | 403 | /* |
6d35572a MD |
404 | * IMPORTANT: this structure is part of the ABI between the probe and |
405 | * UST. Fields need to be only added at the end, never reordered, never | |
406 | * removed. | |
407 | * | |
93cfd247 MD |
408 | * struct lttng_ust_event_notifier is the action for sending |
409 | * notifications. It inherits from struct lttng_ust_event_common | |
410 | * by composition to ensure both parent and child structure are | |
411 | * extensible. | |
412 | * | |
413 | * The field @struct_size should be used to determine the size of the | |
414 | * structure. It should be queried before using additional fields added | |
415 | * at the end of the structure. | |
416 | */ | |
d7d45c0d | 417 | struct lttng_ust_event_notifier { |
115db533 | 418 | uint32_t struct_size; /* Size of this structure. */ |
105cf2eb | 419 | |
ba99fbe2 | 420 | struct lttng_ust_event_common *parent; /* Inheritance by aggregation. */ |
115db533 MD |
421 | struct lttng_ust_event_notifier_private *priv; /* Private event notifier interface */ |
422 | ||
a2e4d05e | 423 | int eval_capture; /* Need to evaluate capture */ |
d7d45c0d | 424 | void (*notification_send)(struct lttng_ust_event_notifier *event_notifier, |
a2e4d05e MD |
425 | const char *stack_data, |
426 | struct lttng_ust_notification_ctx *notif_ctx); | |
93cfd247 MD |
427 | |
428 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
d8d2416d FD |
429 | }; |
430 | ||
5198080d | 431 | struct lttng_ust_lib_ring_buffer_channel; |
14b6f891 | 432 | struct lttng_ust_channel_buffer_ops_private; |
8d8a24c8 | 433 | |
180901e6 MD |
434 | /* |
435 | * IMPORTANT: this structure is part of the ABI between the probe and | |
436 | * UST. Fields need to be only added at the end, never reordered, never | |
437 | * removed. | |
49926dbd MD |
438 | * |
439 | * The field @struct_size should be used to determine the size of the | |
440 | * structure. It should be queried before using additional fields added | |
441 | * at the end of the structure. | |
180901e6 | 442 | */ |
14b6f891 | 443 | struct lttng_ust_channel_buffer_ops { |
49926dbd MD |
444 | uint32_t struct_size; |
445 | ||
14b6f891 | 446 | struct lttng_ust_channel_buffer_ops_private *priv; /* Private channel buffer ops interface */ |
a880bae5 | 447 | |
4cfec15c | 448 | int (*event_reserve)(struct lttng_ust_lib_ring_buffer_ctx *ctx, |
8020ceb5 | 449 | uint32_t event_id); |
4cfec15c | 450 | void (*event_commit)(struct lttng_ust_lib_ring_buffer_ctx *ctx); |
74d81a6c MD |
451 | void (*event_write)(struct lttng_ust_lib_ring_buffer_ctx *ctx, |
452 | const void *src, size_t len); | |
a44c74d9 MD |
453 | void (*event_strcpy)(struct lttng_ust_lib_ring_buffer_ctx *ctx, |
454 | const char *src, size_t len); | |
879f9b0a | 455 | void (*event_pstrcpy_pad)(struct lttng_ust_lib_ring_buffer_ctx *ctx, |
27927814 | 456 | const char *src, size_t len); |
49926dbd MD |
457 | |
458 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
8020ceb5 MD |
459 | }; |
460 | ||
e7bc0ef6 MD |
461 | enum lttng_ust_channel_type { |
462 | LTTNG_UST_CHANNEL_TYPE_BUFFER = 0, | |
463 | }; | |
464 | ||
465 | struct lttng_ust_channel_common_private; | |
466 | ||
180901e6 MD |
467 | /* |
468 | * IMPORTANT: this structure is part of the ABI between the probe and | |
469 | * UST. Fields need to be only added at the end, never reordered, never | |
470 | * removed. | |
e7bc0ef6 MD |
471 | * |
472 | * The field @struct_size should be used to determine the size of the | |
473 | * structure. It should be queried before using additional fields added | |
474 | * at the end of the structure. | |
180901e6 | 475 | */ |
e7bc0ef6 MD |
476 | struct lttng_ust_channel_common { |
477 | uint32_t struct_size; /* Size of this structure. */ | |
478 | ||
479 | struct lttng_ust_channel_common_private *priv; /* Private channel interface */ | |
480 | ||
481 | enum lttng_ust_channel_type type; | |
482 | void *child; /* Pointer to child, for inheritance by aggregation. */ | |
483 | ||
976fe9ea | 484 | int enabled; |
f69fe5fb | 485 | struct lttng_ust_session *session; |
e7bc0ef6 MD |
486 | |
487 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
488 | }; | |
489 | ||
490 | struct lttng_ust_channel_buffer_private; | |
491 | ||
492 | /* | |
493 | * IMPORTANT: this structure is part of the ABI between the probe and | |
494 | * UST. Fields need to be only added at the end, never reordered, never | |
495 | * removed. | |
496 | * | |
497 | * The field @struct_size should be used to determine the size of the | |
498 | * structure. It should be queried before using additional fields added | |
499 | * at the end of the structure. | |
500 | */ | |
501 | struct lttng_ust_channel_buffer { | |
502 | uint32_t struct_size; /* Size of this structure. */ | |
503 | ||
504 | struct lttng_ust_channel_common *parent; /* Inheritance by aggregation. */ | |
505 | struct lttng_ust_channel_buffer_private *priv; /* Private channel buffer interface */ | |
506 | ||
14b6f891 | 507 | struct lttng_ust_channel_buffer_ops *ops; |
a3f61e7f | 508 | |
e7bc0ef6 | 509 | /* End of base ABI. Fields below should be used after checking struct_size. */ |
8020ceb5 MD |
510 | }; |
511 | ||
2a9d9339 MD |
512 | /* |
513 | * IMPORTANT: this structure is part of the ABI between the probe and | |
514 | * UST. Fields need to be only added at the end, never reordered, never | |
515 | * removed. | |
516 | * | |
517 | * The field @struct_size should be used to determine the size of the | |
518 | * structure. It should be queried before using additional fields added | |
519 | * at the end of the structure. | |
520 | */ | |
521 | struct lttng_ust_stack_ctx { | |
522 | uint32_t struct_size; /* Size of this structure */ | |
523 | ||
2e70391c | 524 | struct lttng_ust_event_recorder *event_recorder; |
2a9d9339 MD |
525 | |
526 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
53569322 MD |
527 | }; |
528 | ||
bdb12629 MD |
529 | struct lttng_ust_session_private; |
530 | ||
180901e6 MD |
531 | /* |
532 | * IMPORTANT: this structure is part of the ABI between the probe and | |
533 | * UST. Fields need to be only added at the end, never reordered, never | |
534 | * removed. | |
6d35572a MD |
535 | * |
536 | * The field @struct_size should be used to determine the size of the | |
537 | * structure. It should be queried before using additional fields added | |
538 | * at the end of the structure. | |
180901e6 | 539 | */ |
f69fe5fb | 540 | struct lttng_ust_session { |
bd640d74 | 541 | uint32_t struct_size; /* Size of this structure */ |
dc177d11 | 542 | |
bdb12629 MD |
543 | struct lttng_ust_session_private *priv; /* Private session interface */ |
544 | ||
e58095ef | 545 | int active; /* Is trace session active ? */ |
6d35572a MD |
546 | |
547 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
8020ceb5 MD |
548 | }; |
549 | ||
dc11f93f MD |
550 | int lttng_ust_probe_register(struct lttng_ust_probe_desc *desc); |
551 | void lttng_ust_probe_unregister(struct lttng_ust_probe_desc *desc); | |
9f3fdbc6 | 552 | |
fc80554e | 553 | /* |
0af0bdb2 MJ |
554 | * Applications that change their procname and need the new value to be |
555 | * reflected in the procname event context have to call this function to clear | |
556 | * the internally cached value. This should not be called from a signal | |
557 | * handler. | |
fc80554e | 558 | */ |
0af0bdb2 | 559 | void lttng_ust_context_procname_reset(void); |
d58d1454 | 560 | |
6453d237 MD |
561 | #ifdef __cplusplus |
562 | } | |
563 | #endif | |
564 | ||
51489cad | 565 | #endif /* _LTTNG_UST_EVENTS_H */ |