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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> | |
9af5d97a | 23 | #include <limits.h> |
8020ceb5 | 24 | |
6453d237 MD |
25 | #ifdef __cplusplus |
26 | extern "C" { | |
27 | #endif | |
28 | ||
19d8b1b3 MD |
29 | #define LTTNG_UST_UUID_LEN 16 |
30 | ||
71d31690 MD |
31 | /* |
32 | * Tracepoint provider version. Compatibility based on the major number. | |
33 | * Older tracepoint providers can always register to newer lttng-ust | |
34 | * library, but the opposite is rejected: a newer tracepoint provider is | |
35 | * rejected by an older lttng-ust library. | |
36 | */ | |
04f0b55a | 37 | #define LTTNG_UST_PROVIDER_MAJOR 2 |
71d31690 MD |
38 | #define LTTNG_UST_PROVIDER_MINOR 0 |
39 | ||
e7bc0ef6 | 40 | struct lttng_ust_channel_buffer; |
f69fe5fb | 41 | struct lttng_ust_session; |
4cfec15c | 42 | struct lttng_ust_lib_ring_buffer_ctx; |
25cff019 | 43 | struct lttng_ust_event_field; |
8020ceb5 | 44 | |
37d5e202 MD |
45 | /* |
46 | * Data structures used by tracepoint event declarations, and by the | |
a084756d | 47 | * tracer. |
37d5e202 MD |
48 | */ |
49 | ||
8020ceb5 MD |
50 | /* Type description */ |
51 | ||
a084756d MD |
52 | enum lttng_ust_type { |
53 | lttng_ust_type_integer, | |
54 | lttng_ust_type_string, | |
55 | lttng_ust_type_float, | |
56 | lttng_ust_type_dynamic, | |
57 | lttng_ust_type_enum, | |
58 | lttng_ust_type_array, | |
59 | lttng_ust_type_sequence, | |
60 | lttng_ust_type_struct, | |
61 | NR_LTTNG_UST_TYPE, | |
8020ceb5 MD |
62 | }; |
63 | ||
a084756d MD |
64 | enum lttng_ust_string_encoding { |
65 | lttng_ust_string_encoding_none = 0, | |
66 | lttng_ust_string_encoding_UTF8 = 1, | |
67 | lttng_ust_string_encoding_ASCII = 2, | |
68 | NR_LTTNG_UST_STRING_ENCODING, | |
8020ceb5 MD |
69 | }; |
70 | ||
1a37a873 | 71 | struct lttng_ust_enum_value { |
a6f80644 MD |
72 | unsigned long long value; |
73 | unsigned int signedness:1; | |
74 | }; | |
75 | ||
1a37a873 MD |
76 | enum lttng_ust_enum_entry_option { |
77 | LTTNG_UST_ENUM_ENTRY_OPTION_IS_AUTO = 1U << 0, | |
3e762260 PP |
78 | }; |
79 | ||
891d6b55 MD |
80 | /* |
81 | * Enumeration entry description | |
82 | * | |
83 | * IMPORTANT: this structure is part of the ABI between the probe and | |
84 | * UST. Fields need to be only added at the end, never reordered, never | |
85 | * removed. | |
86 | * | |
87 | * The field @struct_size should be used to determine the size of the | |
88 | * structure. It should be queried before using additional fields added | |
89 | * at the end of the structure. | |
90 | */ | |
91 | ||
92 | struct lttng_ust_enum_entry { | |
93 | uint32_t struct_size; | |
94 | ||
1a37a873 | 95 | struct lttng_ust_enum_value start, end; /* start and end are inclusive */ |
8020ceb5 | 96 | const char *string; |
891d6b55 MD |
97 | unsigned int options; |
98 | ||
99 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
8020ceb5 MD |
100 | }; |
101 | ||
a084756d MD |
102 | /* |
103 | * struct lttng_ust_type_common is fixed-size. Its children inherits | |
104 | * from it by embedding struct lttng_ust_type_common as its first field. | |
105 | */ | |
106 | struct lttng_ust_type_common { | |
107 | enum lttng_ust_type type; | |
108 | }; | |
109 | ||
110 | struct lttng_ust_type_integer { | |
111 | struct lttng_ust_type_common parent; | |
112 | uint32_t struct_size; | |
8020ceb5 MD |
113 | unsigned int size; /* in bits */ |
114 | unsigned short alignment; /* in bits */ | |
115 | unsigned int signedness:1; | |
116 | unsigned int reverse_byte_order:1; | |
117 | unsigned int base; /* 2, 8, 10, 16, for pretty print */ | |
a084756d MD |
118 | }; |
119 | ||
120 | #define lttng_ust_type_integer_define(_type, _byte_order, _base) \ | |
121 | ((struct lttng_ust_type_common *) __LTTNG_COMPOUND_LITERAL(struct lttng_ust_type_integer, { \ | |
122 | .parent = { \ | |
123 | .type = lttng_ust_type_integer, \ | |
124 | }, \ | |
125 | .struct_size = sizeof(struct lttng_ust_type_integer), \ | |
126 | .size = sizeof(_type) * CHAR_BIT, \ | |
dc325c1d | 127 | .alignment = lttng_ust_rb_alignof(_type) * CHAR_BIT, \ |
eae3c729 | 128 | .signedness = lttng_ust_is_signed_type(_type), \ |
a084756d MD |
129 | .reverse_byte_order = _byte_order != BYTE_ORDER, \ |
130 | .base = _base, \ | |
131 | })) | |
132 | ||
133 | struct lttng_ust_type_float { | |
134 | struct lttng_ust_type_common parent; | |
135 | uint32_t struct_size; | |
136 | unsigned int exp_dig; /* exponent digits, in bits */ | |
137 | unsigned int mant_dig; /* mantissa digits, in bits */ | |
138 | unsigned short alignment; /* in bits */ | |
139 | unsigned int reverse_byte_order:1; | |
8020ceb5 MD |
140 | }; |
141 | ||
d3ed854b MD |
142 | /* |
143 | * Only float and double are supported. long double is not supported at | |
144 | * the moment. | |
145 | */ | |
89080a49 | 146 | #define lttng_ust_float_mant_dig(_type) \ |
20f1eee7 MD |
147 | (sizeof(_type) == sizeof(float) ? FLT_MANT_DIG \ |
148 | : (sizeof(_type) == sizeof(double) ? DBL_MANT_DIG \ | |
d3ed854b | 149 | : 0)) |
20f1eee7 | 150 | |
a084756d MD |
151 | #define lttng_ust_type_float_define(_type) \ |
152 | ((struct lttng_ust_type_common *) __LTTNG_COMPOUND_LITERAL(struct lttng_ust_type_float, { \ | |
153 | .parent = { \ | |
154 | .type = lttng_ust_type_float, \ | |
155 | }, \ | |
156 | .struct_size = sizeof(struct lttng_ust_type_float), \ | |
157 | .exp_dig = sizeof(_type) * CHAR_BIT \ | |
89080a49 MD |
158 | - lttng_ust_float_mant_dig(_type), \ |
159 | .mant_dig = lttng_ust_float_mant_dig(_type), \ | |
dc325c1d | 160 | .alignment = lttng_ust_rb_alignof(_type) * CHAR_BIT, \ |
a084756d MD |
161 | .reverse_byte_order = BYTE_ORDER != FLOAT_WORD_ORDER, \ |
162 | })) | |
163 | ||
164 | ||
165 | struct lttng_ust_type_string { | |
166 | struct lttng_ust_type_common parent; | |
167 | uint32_t struct_size; | |
168 | enum lttng_ust_string_encoding encoding; | |
20f1eee7 MD |
169 | }; |
170 | ||
a084756d MD |
171 | struct lttng_ust_type_enum { |
172 | struct lttng_ust_type_common parent; | |
173 | uint32_t struct_size; | |
174 | struct lttng_ust_enum_desc *desc; /* Enumeration mapping */ | |
175 | struct lttng_ust_type_common *container_type; | |
176 | }; | |
177 | ||
178 | struct lttng_ust_type_array { | |
179 | struct lttng_ust_type_common parent; | |
180 | uint32_t struct_size; | |
181 | struct lttng_ust_type_common *elem_type; | |
182 | unsigned int length; /* Num. elems. */ | |
183 | unsigned int alignment; | |
184 | enum lttng_ust_string_encoding encoding; | |
185 | }; | |
186 | ||
187 | struct lttng_ust_type_sequence { | |
188 | struct lttng_ust_type_common parent; | |
189 | uint32_t struct_size; | |
190 | const char *length_name; /* Length field name. */ | |
191 | struct lttng_ust_type_common *elem_type; | |
192 | unsigned int alignment; /* Alignment before elements. */ | |
193 | enum lttng_ust_string_encoding encoding; | |
194 | }; | |
195 | ||
196 | struct lttng_ust_type_struct { | |
197 | struct lttng_ust_type_common parent; | |
198 | uint32_t struct_size; | |
199 | unsigned int nr_fields; | |
200 | struct lttng_ust_event_field **fields; /* Array of pointers to fields. */ | |
201 | unsigned int alignment; | |
8020ceb5 MD |
202 | }; |
203 | ||
891d6b55 MD |
204 | /* |
205 | * Enumeration description | |
206 | * | |
207 | * IMPORTANT: this structure is part of the ABI between the probe and | |
208 | * UST. Fields need to be only added at the end, never reordered, never | |
209 | * removed. | |
210 | * | |
211 | * The field @struct_size should be used to determine the size of the | |
212 | * structure. It should be queried before using additional fields added | |
213 | * at the end of the structure. | |
214 | */ | |
215 | ||
216 | struct lttng_ust_enum_desc { | |
217 | uint32_t struct_size; | |
218 | ||
8020ceb5 | 219 | const char *name; |
a084756d | 220 | struct lttng_ust_enum_entry **entries; |
c785c634 | 221 | unsigned int nr_entries; |
891d6b55 MD |
222 | |
223 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
8020ceb5 MD |
224 | }; |
225 | ||
180901e6 MD |
226 | /* |
227 | * Event field description | |
228 | * | |
229 | * IMPORTANT: this structure is part of the ABI between the probe and | |
230 | * UST. Fields need to be only added at the end, never reordered, never | |
231 | * removed. | |
25cff019 MD |
232 | * |
233 | * The field @struct_size should be used to determine the size of the | |
234 | * structure. It should be queried before using additional fields added | |
235 | * at the end of the structure. | |
180901e6 | 236 | */ |
8020ceb5 | 237 | |
25cff019 MD |
238 | struct lttng_ust_event_field { |
239 | uint32_t struct_size; | |
240 | ||
8020ceb5 | 241 | const char *name; |
a084756d | 242 | struct lttng_ust_type_common *type; |
25cff019 MD |
243 | unsigned int nowrite:1, /* do not write into trace */ |
244 | nofilter:1; /* do not consider for filter */ | |
245 | ||
246 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
8020ceb5 MD |
247 | }; |
248 | ||
37d5e202 | 249 | |
dc11f93f MD |
250 | /* |
251 | * IMPORTANT: this structure is part of the ABI between the probe and | |
252 | * UST. Fields need to be only added at the end, never reordered, never | |
253 | * removed. | |
254 | * | |
255 | * The field @struct_size should be used to determine the size of the | |
256 | * structure. It should be queried before using additional fields added | |
257 | * at the end of the structure. | |
258 | */ | |
259 | struct lttng_ust_event_desc { | |
260 | uint32_t struct_size; /* Size of this structure. */ | |
dc177d11 | 261 | |
5b4c6da4 MD |
262 | const char *event_name; |
263 | struct lttng_ust_probe_desc *probe_desc; | |
fbdeb5ec | 264 | void (*probe_callback)(void); |
a084756d MD |
265 | struct lttng_event_ctx *ctx; /* context */ |
266 | struct lttng_ust_event_field **fields; /* event payload */ | |
37d5e202 MD |
267 | unsigned int nr_fields; |
268 | const int **loglevel; | |
dc11f93f MD |
269 | const char *signature; /* Argument types/names received */ |
270 | const char **model_emf_uri; | |
271 | ||
272 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
37d5e202 MD |
273 | }; |
274 | ||
dc11f93f MD |
275 | /* |
276 | * IMPORTANT: this structure is part of the ABI between the probe and | |
277 | * UST. Fields need to be only added at the end, never reordered, never | |
278 | * removed. | |
279 | * | |
280 | * The field @struct_size should be used to determine the size of the | |
281 | * structure. It should be queried before using additional fields added | |
282 | * at the end of the structure. | |
283 | */ | |
284 | struct lttng_ust_probe_desc { | |
285 | uint32_t struct_size; /* Size of this structure. */ | |
286 | ||
5b4c6da4 | 287 | const char *provider_name; |
a084756d | 288 | struct lttng_ust_event_desc **event_desc; |
37d5e202 MD |
289 | unsigned int nr_events; |
290 | struct cds_list_head head; /* chain registered probes */ | |
6715d7d1 MD |
291 | struct cds_list_head lazy_init_head; |
292 | int lazy; /* lazy registration */ | |
71d31690 MD |
293 | uint32_t major; |
294 | uint32_t minor; | |
dc11f93f MD |
295 | |
296 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
8020ceb5 MD |
297 | }; |
298 | ||
37d5e202 MD |
299 | /* Data structures used by the tracer. */ |
300 | ||
8020ceb5 | 301 | /* |
7dd08bec MD |
302 | * lttng_event structure is referred to by the tracing fast path. It |
303 | * must be kept small. | |
180901e6 MD |
304 | * |
305 | * IMPORTANT: this structure is part of the ABI between the probe and | |
306 | * UST. Fields need to be only added at the end, never reordered, never | |
307 | * removed. | |
8020ceb5 | 308 | */ |
68bb7559 | 309 | |
daacdbfc | 310 | struct lttng_ust_ctx; |
80333dfa MD |
311 | struct lttng_ust_event_common_private; |
312 | ||
808edfc8 MD |
313 | enum lttng_ust_event_type { |
314 | LTTNG_UST_EVENT_TYPE_RECORDER = 0, | |
315 | LTTNG_UST_EVENT_TYPE_NOTIFIER = 1, | |
316 | }; | |
317 | ||
a2e4d05e MD |
318 | /* |
319 | * Result of the run_filter() callback. | |
320 | */ | |
321 | enum lttng_ust_event_filter_result { | |
322 | LTTNG_UST_EVENT_FILTER_ACCEPT = 0, | |
323 | LTTNG_UST_EVENT_FILTER_REJECT = 1, | |
324 | }; | |
325 | ||
93cfd247 | 326 | /* |
6d35572a MD |
327 | * IMPORTANT: this structure is part of the ABI between the probe and |
328 | * UST. Fields need to be only added at the end, never reordered, never | |
329 | * removed. | |
330 | * | |
93cfd247 MD |
331 | * struct lttng_ust_event_common is the common ancestor of the various |
332 | * public event actions. Inheritance is done by composition: The parent | |
333 | * has a pointer to its child, and the child has a pointer to its | |
334 | * parent. Inheritance of those public structures is done by composition | |
335 | * to ensure both parent and child structures can be extended. | |
336 | * | |
337 | * The field @struct_size should be used to determine the size of the | |
338 | * structure. It should be queried before using additional fields added | |
339 | * at the end of the structure. | |
340 | */ | |
7ee76145 | 341 | struct lttng_ust_event_common { |
80333dfa | 342 | uint32_t struct_size; /* Size of this structure. */ |
dc177d11 | 343 | |
80333dfa MD |
344 | struct lttng_ust_event_common_private *priv; /* Private event interface */ |
345 | ||
808edfc8 | 346 | enum lttng_ust_event_type type; |
ba99fbe2 MD |
347 | void *child; /* Pointer to child, for inheritance by aggregation. */ |
348 | ||
80333dfa | 349 | int enabled; |
a2e4d05e MD |
350 | int eval_filter; /* Need to evaluate filters */ |
351 | int (*run_filter)(struct lttng_ust_event_common *event, | |
352 | const char *stack_data, | |
353 | void *filter_ctx); | |
93cfd247 MD |
354 | |
355 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
80333dfa MD |
356 | }; |
357 | ||
2e70391c | 358 | struct lttng_ust_event_recorder_private; |
68bb7559 | 359 | |
93cfd247 | 360 | /* |
6d35572a MD |
361 | * IMPORTANT: this structure is part of the ABI between the probe and |
362 | * UST. Fields need to be only added at the end, never reordered, never | |
363 | * removed. | |
364 | * | |
93cfd247 MD |
365 | * struct lttng_ust_event_recorder is the action for recording events |
366 | * into a ring buffer. It inherits from struct lttng_ust_event_common | |
367 | * by composition to ensure both parent and child structure are | |
368 | * extensible. | |
369 | * | |
370 | * The field @struct_size should be used to determine the size of the | |
371 | * structure. It should be queried before using additional fields added | |
372 | * at the end of the structure. | |
373 | */ | |
2e70391c MD |
374 | struct lttng_ust_event_recorder { |
375 | uint32_t struct_size; /* Size of this structure. */ | |
dc177d11 | 376 | |
ba99fbe2 | 377 | struct lttng_ust_event_common *parent; /* Inheritance by aggregation. */ |
2e70391c | 378 | struct lttng_ust_event_recorder_private *priv; /* Private event record interface */ |
68bb7559 | 379 | |
8020ceb5 | 380 | unsigned int id; |
e7bc0ef6 | 381 | struct lttng_ust_channel_buffer *chan; |
93cfd247 MD |
382 | |
383 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
8020ceb5 MD |
384 | }; |
385 | ||
a2e4d05e MD |
386 | /* |
387 | * IMPORTANT: this structure is part of the ABI between the probe and | |
388 | * UST. Fields need to be only added at the end, never reordered, never | |
389 | * removed. | |
390 | * | |
391 | * The field @struct_size should be used to determine the size of the | |
392 | * structure. It should be queried before using additional fields added | |
393 | * at the end of the structure. | |
394 | */ | |
395 | struct lttng_ust_notification_ctx { | |
396 | uint32_t struct_size; /* Size of this structure. */ | |
397 | int eval_capture; /* Capture evaluation available. */ | |
398 | ||
399 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
400 | }; | |
401 | ||
115db533 MD |
402 | struct lttng_ust_event_notifier_private; |
403 | ||
93cfd247 | 404 | /* |
6d35572a MD |
405 | * IMPORTANT: this structure is part of the ABI between the probe and |
406 | * UST. Fields need to be only added at the end, never reordered, never | |
407 | * removed. | |
408 | * | |
93cfd247 MD |
409 | * struct lttng_ust_event_notifier is the action for sending |
410 | * notifications. It inherits from struct lttng_ust_event_common | |
411 | * by composition to ensure both parent and child structure are | |
412 | * extensible. | |
413 | * | |
414 | * The field @struct_size should be used to determine the size of the | |
415 | * structure. It should be queried before using additional fields added | |
416 | * at the end of the structure. | |
417 | */ | |
d7d45c0d | 418 | struct lttng_ust_event_notifier { |
115db533 | 419 | uint32_t struct_size; /* Size of this structure. */ |
105cf2eb | 420 | |
ba99fbe2 | 421 | struct lttng_ust_event_common *parent; /* Inheritance by aggregation. */ |
115db533 MD |
422 | struct lttng_ust_event_notifier_private *priv; /* Private event notifier interface */ |
423 | ||
a2e4d05e | 424 | int eval_capture; /* Need to evaluate capture */ |
d7d45c0d | 425 | void (*notification_send)(struct lttng_ust_event_notifier *event_notifier, |
a2e4d05e MD |
426 | const char *stack_data, |
427 | struct lttng_ust_notification_ctx *notif_ctx); | |
93cfd247 MD |
428 | |
429 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
d8d2416d FD |
430 | }; |
431 | ||
5198080d | 432 | struct lttng_ust_lib_ring_buffer_channel; |
14b6f891 | 433 | struct lttng_ust_channel_buffer_ops_private; |
8d8a24c8 | 434 | |
180901e6 MD |
435 | /* |
436 | * IMPORTANT: this structure is part of the ABI between the probe and | |
437 | * UST. Fields need to be only added at the end, never reordered, never | |
438 | * removed. | |
49926dbd MD |
439 | * |
440 | * The field @struct_size should be used to determine the size of the | |
441 | * structure. It should be queried before using additional fields added | |
442 | * at the end of the structure. | |
180901e6 | 443 | */ |
14b6f891 | 444 | struct lttng_ust_channel_buffer_ops { |
49926dbd MD |
445 | uint32_t struct_size; |
446 | ||
14b6f891 | 447 | struct lttng_ust_channel_buffer_ops_private *priv; /* Private channel buffer ops interface */ |
a880bae5 | 448 | |
4cfec15c | 449 | int (*event_reserve)(struct lttng_ust_lib_ring_buffer_ctx *ctx, |
8020ceb5 | 450 | uint32_t event_id); |
4cfec15c | 451 | void (*event_commit)(struct lttng_ust_lib_ring_buffer_ctx *ctx); |
74d81a6c MD |
452 | void (*event_write)(struct lttng_ust_lib_ring_buffer_ctx *ctx, |
453 | const void *src, size_t len); | |
a44c74d9 MD |
454 | void (*event_strcpy)(struct lttng_ust_lib_ring_buffer_ctx *ctx, |
455 | const char *src, size_t len); | |
879f9b0a | 456 | void (*event_pstrcpy_pad)(struct lttng_ust_lib_ring_buffer_ctx *ctx, |
27927814 | 457 | const char *src, size_t len); |
49926dbd MD |
458 | |
459 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
8020ceb5 MD |
460 | }; |
461 | ||
e7bc0ef6 MD |
462 | enum lttng_ust_channel_type { |
463 | LTTNG_UST_CHANNEL_TYPE_BUFFER = 0, | |
464 | }; | |
465 | ||
466 | struct lttng_ust_channel_common_private; | |
467 | ||
180901e6 MD |
468 | /* |
469 | * IMPORTANT: this structure is part of the ABI between the probe and | |
470 | * UST. Fields need to be only added at the end, never reordered, never | |
471 | * removed. | |
e7bc0ef6 MD |
472 | * |
473 | * The field @struct_size should be used to determine the size of the | |
474 | * structure. It should be queried before using additional fields added | |
475 | * at the end of the structure. | |
180901e6 | 476 | */ |
e7bc0ef6 MD |
477 | struct lttng_ust_channel_common { |
478 | uint32_t struct_size; /* Size of this structure. */ | |
479 | ||
480 | struct lttng_ust_channel_common_private *priv; /* Private channel interface */ | |
481 | ||
482 | enum lttng_ust_channel_type type; | |
483 | void *child; /* Pointer to child, for inheritance by aggregation. */ | |
484 | ||
976fe9ea | 485 | int enabled; |
f69fe5fb | 486 | struct lttng_ust_session *session; |
e7bc0ef6 MD |
487 | |
488 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
489 | }; | |
490 | ||
491 | struct lttng_ust_channel_buffer_private; | |
492 | ||
493 | /* | |
494 | * IMPORTANT: this structure is part of the ABI between the probe and | |
495 | * UST. Fields need to be only added at the end, never reordered, never | |
496 | * removed. | |
497 | * | |
498 | * The field @struct_size should be used to determine the size of the | |
499 | * structure. It should be queried before using additional fields added | |
500 | * at the end of the structure. | |
501 | */ | |
502 | struct lttng_ust_channel_buffer { | |
503 | uint32_t struct_size; /* Size of this structure. */ | |
504 | ||
505 | struct lttng_ust_channel_common *parent; /* Inheritance by aggregation. */ | |
506 | struct lttng_ust_channel_buffer_private *priv; /* Private channel buffer interface */ | |
507 | ||
14b6f891 | 508 | struct lttng_ust_channel_buffer_ops *ops; |
a3f61e7f | 509 | |
e7bc0ef6 | 510 | /* End of base ABI. Fields below should be used after checking struct_size. */ |
8020ceb5 MD |
511 | }; |
512 | ||
2a9d9339 MD |
513 | /* |
514 | * IMPORTANT: this structure is part of the ABI between the probe and | |
515 | * UST. Fields need to be only added at the end, never reordered, never | |
516 | * removed. | |
517 | * | |
518 | * The field @struct_size should be used to determine the size of the | |
519 | * structure. It should be queried before using additional fields added | |
520 | * at the end of the structure. | |
521 | */ | |
522 | struct lttng_ust_stack_ctx { | |
523 | uint32_t struct_size; /* Size of this structure */ | |
524 | ||
2e70391c | 525 | struct lttng_ust_event_recorder *event_recorder; |
2a9d9339 MD |
526 | |
527 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
53569322 MD |
528 | }; |
529 | ||
bdb12629 MD |
530 | struct lttng_ust_session_private; |
531 | ||
180901e6 MD |
532 | /* |
533 | * IMPORTANT: this structure is part of the ABI between the probe and | |
534 | * UST. Fields need to be only added at the end, never reordered, never | |
535 | * removed. | |
6d35572a MD |
536 | * |
537 | * The field @struct_size should be used to determine the size of the | |
538 | * structure. It should be queried before using additional fields added | |
539 | * at the end of the structure. | |
180901e6 | 540 | */ |
f69fe5fb | 541 | struct lttng_ust_session { |
bd640d74 | 542 | uint32_t struct_size; /* Size of this structure */ |
dc177d11 | 543 | |
bdb12629 MD |
544 | struct lttng_ust_session_private *priv; /* Private session interface */ |
545 | ||
e58095ef | 546 | int active; /* Is trace session active ? */ |
6d35572a MD |
547 | |
548 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
8020ceb5 MD |
549 | }; |
550 | ||
dc11f93f MD |
551 | int lttng_ust_probe_register(struct lttng_ust_probe_desc *desc); |
552 | void lttng_ust_probe_unregister(struct lttng_ust_probe_desc *desc); | |
9f3fdbc6 | 553 | |
fc80554e | 554 | /* |
0af0bdb2 MJ |
555 | * Applications that change their procname and need the new value to be |
556 | * reflected in the procname event context have to call this function to clear | |
557 | * the internally cached value. This should not be called from a signal | |
558 | * handler. | |
fc80554e | 559 | */ |
0af0bdb2 | 560 | void lttng_ust_context_procname_reset(void); |
d58d1454 | 561 | |
6453d237 MD |
562 | #ifdef __cplusplus |
563 | } | |
564 | #endif | |
565 | ||
51489cad | 566 | #endif /* _LTTNG_UST_EVENTS_H */ |