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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 | |
db56acaf MD |
24 | #ifndef LTTNG_PACKED |
25 | #error "LTTNG_PACKED should be defined" | |
26 | #endif | |
27 | ||
6453d237 MD |
28 | #ifdef __cplusplus |
29 | extern "C" { | |
30 | #endif | |
31 | ||
19d8b1b3 MD |
32 | #define LTTNG_UST_UUID_LEN 16 |
33 | ||
71d31690 MD |
34 | /* |
35 | * Tracepoint provider version. Compatibility based on the major number. | |
36 | * Older tracepoint providers can always register to newer lttng-ust | |
37 | * library, but the opposite is rejected: a newer tracepoint provider is | |
38 | * rejected by an older lttng-ust library. | |
39 | */ | |
04f0b55a | 40 | #define LTTNG_UST_PROVIDER_MAJOR 2 |
71d31690 MD |
41 | #define LTTNG_UST_PROVIDER_MINOR 0 |
42 | ||
7dd08bec MD |
43 | struct lttng_channel; |
44 | struct lttng_session; | |
4cfec15c | 45 | struct lttng_ust_lib_ring_buffer_ctx; |
25cff019 | 46 | struct lttng_ust_event_field; |
ebabbf58 | 47 | struct lttng_event_notifier_group; |
8020ceb5 | 48 | |
37d5e202 MD |
49 | /* |
50 | * Data structures used by tracepoint event declarations, and by the | |
51 | * tracer. Those structures have padding for future extension. | |
52 | */ | |
53 | ||
8020ceb5 MD |
54 | /* Type description */ |
55 | ||
56 | /* Update the astract_types name table in lttng-types.c along with this enum */ | |
7dd08bec | 57 | enum lttng_abstract_types { |
8020ceb5 | 58 | atype_integer, |
8020ceb5 | 59 | atype_string, |
20f1eee7 | 60 | atype_float, |
53569322 | 61 | atype_dynamic, |
218deb69 MD |
62 | atype_enum_nestable, |
63 | atype_array_nestable, | |
64 | atype_sequence_nestable, | |
65 | atype_struct_nestable, | |
8020ceb5 MD |
66 | NR_ABSTRACT_TYPES, |
67 | }; | |
68 | ||
69 | /* Update the string_encodings name table in lttng-types.c along with this enum */ | |
70 | enum lttng_string_encodings { | |
71 | lttng_encode_none = 0, | |
72 | lttng_encode_UTF8 = 1, | |
73 | lttng_encode_ASCII = 2, | |
74 | NR_STRING_ENCODINGS, | |
75 | }; | |
76 | ||
a6f80644 MD |
77 | struct lttng_enum_value { |
78 | unsigned long long value; | |
79 | unsigned int signedness:1; | |
80 | }; | |
81 | ||
3e762260 PP |
82 | enum lttng_enum_entry_options { |
83 | LTTNG_ENUM_ENTRY_OPTION_IS_AUTO = 1U << 0, | |
84 | }; | |
85 | ||
891d6b55 MD |
86 | /* |
87 | * Enumeration entry description | |
88 | * | |
89 | * IMPORTANT: this structure is part of the ABI between the probe and | |
90 | * UST. Fields need to be only added at the end, never reordered, never | |
91 | * removed. | |
92 | * | |
93 | * The field @struct_size should be used to determine the size of the | |
94 | * structure. It should be queried before using additional fields added | |
95 | * at the end of the structure. | |
96 | */ | |
97 | ||
98 | struct lttng_ust_enum_entry { | |
99 | uint32_t struct_size; | |
100 | ||
a6f80644 | 101 | struct lttng_enum_value start, end; /* start and end are inclusive */ |
8020ceb5 | 102 | const char *string; |
891d6b55 MD |
103 | unsigned int options; |
104 | ||
105 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
8020ceb5 MD |
106 | }; |
107 | ||
108 | #define __type_integer(_type, _byte_order, _base, _encoding) \ | |
109 | { \ | |
46d52200 ZT |
110 | .atype = atype_integer, \ |
111 | .u = \ | |
8020ceb5 | 112 | { \ |
218deb69 | 113 | .integer = \ |
46d52200 | 114 | { \ |
218deb69 MD |
115 | .size = sizeof(_type) * CHAR_BIT, \ |
116 | .alignment = lttng_alignof(_type) * CHAR_BIT, \ | |
117 | .signedness = lttng_is_signed_type(_type), \ | |
118 | .reverse_byte_order = _byte_order != BYTE_ORDER, \ | |
119 | .base = _base, \ | |
120 | .encoding = lttng_encode_##_encoding, \ | |
46d52200 | 121 | } \ |
8020ceb5 MD |
122 | }, \ |
123 | } \ | |
124 | ||
37d5e202 | 125 | #define LTTNG_UST_INTEGER_TYPE_PADDING 24 |
8020ceb5 MD |
126 | struct lttng_integer_type { |
127 | unsigned int size; /* in bits */ | |
128 | unsigned short alignment; /* in bits */ | |
129 | unsigned int signedness:1; | |
130 | unsigned int reverse_byte_order:1; | |
131 | unsigned int base; /* 2, 8, 10, 16, for pretty print */ | |
132 | enum lttng_string_encodings encoding; | |
37d5e202 | 133 | char padding[LTTNG_UST_INTEGER_TYPE_PADDING]; |
8020ceb5 MD |
134 | }; |
135 | ||
d3ed854b MD |
136 | /* |
137 | * Only float and double are supported. long double is not supported at | |
138 | * the moment. | |
139 | */ | |
20f1eee7 MD |
140 | #define _float_mant_dig(_type) \ |
141 | (sizeof(_type) == sizeof(float) ? FLT_MANT_DIG \ | |
142 | : (sizeof(_type) == sizeof(double) ? DBL_MANT_DIG \ | |
d3ed854b | 143 | : 0)) |
20f1eee7 MD |
144 | |
145 | #define __type_float(_type) \ | |
146 | { \ | |
46d52200 ZT |
147 | .atype = atype_float, \ |
148 | .u = \ | |
20f1eee7 | 149 | { \ |
218deb69 | 150 | ._float = \ |
46d52200 | 151 | { \ |
218deb69 MD |
152 | .exp_dig = sizeof(_type) * CHAR_BIT \ |
153 | - _float_mant_dig(_type), \ | |
154 | .mant_dig = _float_mant_dig(_type), \ | |
155 | .alignment = lttng_alignof(_type) * CHAR_BIT, \ | |
156 | .reverse_byte_order = BYTE_ORDER != FLOAT_WORD_ORDER, \ | |
46d52200 | 157 | } \ |
218deb69 | 158 | } \ |
20f1eee7 MD |
159 | } \ |
160 | ||
37d5e202 | 161 | #define LTTNG_UST_FLOAT_TYPE_PADDING 24 |
20f1eee7 MD |
162 | struct lttng_float_type { |
163 | unsigned int exp_dig; /* exponent digits, in bits */ | |
164 | unsigned int mant_dig; /* mantissa digits, in bits */ | |
165 | unsigned short alignment; /* in bits */ | |
166 | unsigned int reverse_byte_order:1; | |
37d5e202 | 167 | char padding[LTTNG_UST_FLOAT_TYPE_PADDING]; |
20f1eee7 MD |
168 | }; |
169 | ||
37d5e202 | 170 | #define LTTNG_UST_TYPE_PADDING 128 |
8020ceb5 | 171 | struct lttng_type { |
7dd08bec | 172 | enum lttng_abstract_types atype; |
8020ceb5 | 173 | union { |
218deb69 MD |
174 | /* provider ABI 2.0 */ |
175 | struct lttng_integer_type integer; | |
176 | struct lttng_float_type _float; | |
177 | struct { | |
178 | enum lttng_string_encodings encoding; | |
179 | } string; | |
180 | struct { | |
891d6b55 | 181 | const struct lttng_ust_enum_desc *desc; /* Enumeration mapping */ |
218deb69 MD |
182 | struct lttng_type *container_type; |
183 | } enum_nestable; | |
8020ceb5 | 184 | struct { |
218deb69 MD |
185 | const struct lttng_type *elem_type; |
186 | unsigned int length; /* Num. elems. */ | |
187 | unsigned int alignment; | |
188 | } array_nestable; | |
8020ceb5 | 189 | struct { |
218deb69 MD |
190 | const char *length_name; /* Length field name. */ |
191 | const struct lttng_type *elem_type; | |
192 | unsigned int alignment; /* Alignment before elements. */ | |
193 | } sequence_nestable; | |
53569322 | 194 | struct { |
218deb69 | 195 | unsigned int nr_fields; |
25cff019 | 196 | const struct lttng_ust_event_field **fields; /* Array of pointers to fields. */ |
218deb69 MD |
197 | unsigned int alignment; |
198 | } struct_nestable; | |
199 | ||
37d5e202 | 200 | char padding[LTTNG_UST_TYPE_PADDING]; |
8020ceb5 MD |
201 | } u; |
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; |
891d6b55 | 220 | const 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 MD |
241 | const char *name; |
242 | struct lttng_type 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. */ | |
37d5e202 | 261 | const char *name; |
fbdeb5ec | 262 | void (*probe_callback)(void); |
37d5e202 | 263 | const struct lttng_event_ctx *ctx; /* context */ |
25cff019 | 264 | const struct lttng_ust_event_field **fields; /* event payload */ |
37d5e202 MD |
265 | unsigned int nr_fields; |
266 | const int **loglevel; | |
dc11f93f MD |
267 | const char *signature; /* Argument types/names received */ |
268 | const char **model_emf_uri; | |
269 | ||
270 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
37d5e202 MD |
271 | }; |
272 | ||
dc11f93f MD |
273 | /* |
274 | * IMPORTANT: this structure is part of the ABI between the probe and | |
275 | * UST. Fields need to be only added at the end, never reordered, never | |
276 | * removed. | |
277 | * | |
278 | * The field @struct_size should be used to determine the size of the | |
279 | * structure. It should be queried before using additional fields added | |
280 | * at the end of the structure. | |
281 | */ | |
282 | struct lttng_ust_probe_desc { | |
283 | uint32_t struct_size; /* Size of this structure. */ | |
284 | ||
37d5e202 | 285 | const char *provider; |
dc11f93f | 286 | const struct lttng_ust_event_desc **event_desc; |
37d5e202 MD |
287 | unsigned int nr_events; |
288 | struct cds_list_head head; /* chain registered probes */ | |
6715d7d1 MD |
289 | struct cds_list_head lazy_init_head; |
290 | int lazy; /* lazy registration */ | |
71d31690 MD |
291 | uint32_t major; |
292 | uint32_t minor; | |
dc11f93f MD |
293 | |
294 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
8020ceb5 MD |
295 | }; |
296 | ||
37d5e202 MD |
297 | /* Data structures used by the tracer. */ |
298 | ||
8a92ed2a | 299 | /* |
04aa13f8 | 300 | * Bytecode interpreter return value masks. |
8a92ed2a | 301 | */ |
04aa13f8 FD |
302 | enum lttng_bytecode_interpreter_ret { |
303 | LTTNG_INTERPRETER_DISCARD = 0, | |
304 | LTTNG_INTERPRETER_RECORD_FLAG = (1ULL << 0), | |
8a92ed2a MD |
305 | /* Other bits are kept for future use. */ |
306 | }; | |
307 | ||
d37ecb3f | 308 | struct lttng_interpreter_output; |
362a65de | 309 | struct lttng_ust_bytecode_runtime_private; |
d37ecb3f | 310 | |
73d37531 | 311 | /* |
5469a374 MD |
312 | * IMPORTANT: this structure is part of the ABI between the probe and |
313 | * UST. Fields need to be only added at the end, never reordered, never | |
314 | * removed. | |
315 | * | |
316 | * The field @struct_size should be used to determine the size of the | |
317 | * structure. It should be queried before using additional fields added | |
318 | * at the end of the structure. | |
73d37531 | 319 | */ |
5469a374 MD |
320 | struct lttng_ust_bytecode_runtime { |
321 | uint32_t struct_size; /* Size of this structure. */ | |
362a65de | 322 | |
5469a374 | 323 | struct lttng_ust_bytecode_runtime_private *priv; |
f488575f | 324 | /* Associated bytecode */ |
c42416df FD |
325 | union { |
326 | uint64_t (*filter)(void *interpreter_data, | |
327 | const char *interpreter_stack_data); | |
d37ecb3f FD |
328 | uint64_t (*capture)(void *interpreter_data, |
329 | const char *interpreter_stack_data, | |
330 | struct lttng_interpreter_output *interpreter_output); | |
c42416df | 331 | } interpreter_funcs; |
e58095ef | 332 | struct cds_list_head node; /* list of bytecode runtime in event */ |
5469a374 MD |
333 | |
334 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
e58095ef MD |
335 | }; |
336 | ||
8020ceb5 | 337 | /* |
7dd08bec MD |
338 | * lttng_event structure is referred to by the tracing fast path. It |
339 | * must be kept small. | |
180901e6 MD |
340 | * |
341 | * IMPORTANT: this structure is part of the ABI between the probe and | |
342 | * UST. Fields need to be only added at the end, never reordered, never | |
343 | * removed. | |
8020ceb5 | 344 | */ |
68bb7559 | 345 | |
daacdbfc | 346 | struct lttng_ust_ctx; |
80333dfa MD |
347 | struct lttng_ust_event_common_private; |
348 | ||
808edfc8 MD |
349 | enum lttng_ust_event_type { |
350 | LTTNG_UST_EVENT_TYPE_RECORDER = 0, | |
351 | LTTNG_UST_EVENT_TYPE_NOTIFIER = 1, | |
352 | }; | |
353 | ||
93cfd247 | 354 | /* |
6d35572a MD |
355 | * IMPORTANT: this structure is part of the ABI between the probe and |
356 | * UST. Fields need to be only added at the end, never reordered, never | |
357 | * removed. | |
358 | * | |
93cfd247 MD |
359 | * struct lttng_ust_event_common is the common ancestor of the various |
360 | * public event actions. Inheritance is done by composition: The parent | |
361 | * has a pointer to its child, and the child has a pointer to its | |
362 | * parent. Inheritance of those public structures is done by composition | |
363 | * to ensure both parent and child structures can be extended. | |
364 | * | |
365 | * The field @struct_size should be used to determine the size of the | |
366 | * structure. It should be queried before using additional fields added | |
367 | * at the end of the structure. | |
368 | */ | |
7ee76145 | 369 | struct lttng_ust_event_common { |
80333dfa MD |
370 | uint32_t struct_size; /* Size of this structure. */ |
371 | struct lttng_ust_event_common_private *priv; /* Private event interface */ | |
372 | ||
808edfc8 | 373 | enum lttng_ust_event_type type; |
ba99fbe2 MD |
374 | void *child; /* Pointer to child, for inheritance by aggregation. */ |
375 | ||
80333dfa MD |
376 | int enabled; |
377 | int has_enablers_without_bytecode; | |
5469a374 | 378 | /* list of struct lttng_ust_bytecode_runtime, sorted by seqnum */ |
80333dfa | 379 | struct cds_list_head filter_bytecode_runtime_head; |
93cfd247 MD |
380 | |
381 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
80333dfa MD |
382 | }; |
383 | ||
2e70391c | 384 | struct lttng_ust_event_recorder_private; |
68bb7559 | 385 | |
93cfd247 | 386 | /* |
6d35572a MD |
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 | * | |
93cfd247 MD |
391 | * struct lttng_ust_event_recorder is the action for recording events |
392 | * into a ring buffer. It inherits from struct lttng_ust_event_common | |
393 | * by composition to ensure both parent and child structure are | |
394 | * extensible. | |
395 | * | |
396 | * The field @struct_size should be used to determine the size of the | |
397 | * structure. It should be queried before using additional fields added | |
398 | * at the end of the structure. | |
399 | */ | |
2e70391c MD |
400 | struct lttng_ust_event_recorder { |
401 | uint32_t struct_size; /* Size of this structure. */ | |
ba99fbe2 | 402 | struct lttng_ust_event_common *parent; /* Inheritance by aggregation. */ |
2e70391c | 403 | struct lttng_ust_event_recorder_private *priv; /* Private event record interface */ |
68bb7559 | 404 | |
8020ceb5 | 405 | unsigned int id; |
68bb7559 | 406 | struct lttng_channel *chan; |
daacdbfc | 407 | struct lttng_ust_ctx *ctx; |
93cfd247 MD |
408 | |
409 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
8020ceb5 MD |
410 | }; |
411 | ||
115db533 MD |
412 | struct lttng_ust_event_notifier_private; |
413 | ||
93cfd247 | 414 | /* |
6d35572a MD |
415 | * IMPORTANT: this structure is part of the ABI between the probe and |
416 | * UST. Fields need to be only added at the end, never reordered, never | |
417 | * removed. | |
418 | * | |
93cfd247 MD |
419 | * struct lttng_ust_event_notifier is the action for sending |
420 | * notifications. It inherits from struct lttng_ust_event_common | |
421 | * by composition to ensure both parent and child structure are | |
422 | * extensible. | |
423 | * | |
424 | * The field @struct_size should be used to determine the size of the | |
425 | * structure. It should be queried before using additional fields added | |
426 | * at the end of the structure. | |
427 | */ | |
d7d45c0d | 428 | struct lttng_ust_event_notifier { |
115db533 | 429 | uint32_t struct_size; /* Size of this structure. */ |
105cf2eb | 430 | |
ba99fbe2 | 431 | struct lttng_ust_event_common *parent; /* Inheritance by aggregation. */ |
115db533 MD |
432 | struct lttng_ust_event_notifier_private *priv; /* Private event notifier interface */ |
433 | ||
d7d45c0d | 434 | void (*notification_send)(struct lttng_ust_event_notifier *event_notifier, |
cab88ff8 | 435 | const char *stack_data); |
d37ecb3f | 436 | struct cds_list_head capture_bytecode_runtime_head; |
93cfd247 MD |
437 | |
438 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
d8d2416d FD |
439 | }; |
440 | ||
5198080d | 441 | struct lttng_ust_lib_ring_buffer_channel; |
38fae1d3 | 442 | struct lttng_ust_shm_handle; |
8d8a24c8 | 443 | |
180901e6 MD |
444 | /* |
445 | * IMPORTANT: this structure is part of the ABI between the probe and | |
446 | * UST. Fields need to be only added at the end, never reordered, never | |
447 | * removed. | |
49926dbd MD |
448 | * |
449 | * The field @struct_size should be used to determine the size of the | |
450 | * structure. It should be queried before using additional fields added | |
451 | * at the end of the structure. | |
180901e6 | 452 | */ |
49926dbd MD |
453 | struct lttng_ust_channel_ops { |
454 | uint32_t struct_size; | |
455 | ||
7dd08bec | 456 | struct lttng_channel *(*channel_create)(const char *name, |
74d81a6c MD |
457 | void *buf_addr, |
458 | size_t subbuf_size, size_t num_subbuf, | |
459 | unsigned int switch_timer_interval, | |
460 | unsigned int read_timer_interval, | |
6ca18e66 | 461 | unsigned char *uuid, |
a9ff648c | 462 | uint32_t chan_id, |
b2c5f61a MD |
463 | const int *stream_fds, int nr_stream_fds, |
464 | int64_t blocking_timeout); | |
74d81a6c | 465 | void (*channel_destroy)(struct lttng_channel *chan); |
4cfec15c | 466 | int (*event_reserve)(struct lttng_ust_lib_ring_buffer_ctx *ctx, |
8020ceb5 | 467 | uint32_t event_id); |
4cfec15c | 468 | void (*event_commit)(struct lttng_ust_lib_ring_buffer_ctx *ctx); |
74d81a6c MD |
469 | void (*event_write)(struct lttng_ust_lib_ring_buffer_ctx *ctx, |
470 | const void *src, size_t len); | |
8020ceb5 MD |
471 | /* |
472 | * packet_avail_size returns the available size in the current | |
473 | * packet. Note that the size returned is only a hint, since it | |
474 | * may change due to concurrent writes. | |
475 | */ | |
5198080d | 476 | size_t (*packet_avail_size)(struct lttng_ust_lib_ring_buffer_channel *chan, |
38fae1d3 | 477 | struct lttng_ust_shm_handle *handle); |
5198080d MJ |
478 | int (*is_finalized)(struct lttng_ust_lib_ring_buffer_channel *chan); |
479 | int (*is_disabled)(struct lttng_ust_lib_ring_buffer_channel *chan); | |
480 | int (*flush_buffer)(struct lttng_ust_lib_ring_buffer_channel *chan, | |
481 | struct lttng_ust_shm_handle *handle); | |
a44c74d9 MD |
482 | void (*event_strcpy)(struct lttng_ust_lib_ring_buffer_ctx *ctx, |
483 | const char *src, size_t len); | |
49926dbd MD |
484 | |
485 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
8020ceb5 MD |
486 | }; |
487 | ||
180901e6 MD |
488 | /* |
489 | * IMPORTANT: this structure is part of the ABI between the probe and | |
490 | * UST. Fields need to be only added at the end, never reordered, never | |
491 | * removed. | |
492 | */ | |
7dd08bec | 493 | struct lttng_channel { |
a3f61e7f MD |
494 | /* |
495 | * The pointers located in this private data are NOT safe to be | |
496 | * dereferenced by the consumer. The only operations the | |
497 | * consumer process is designed to be allowed to do is to read | |
498 | * and perform subbuffer flush. | |
499 | */ | |
5198080d | 500 | struct lttng_ust_lib_ring_buffer_channel *chan; /* Channel buffers */ |
976fe9ea | 501 | int enabled; |
daacdbfc | 502 | struct lttng_ust_ctx *ctx; |
8020ceb5 | 503 | /* Event ID management */ |
7dd08bec | 504 | struct lttng_session *session; |
0a42beb6 | 505 | int objd; /* Object associated to channel */ |
e58095ef | 506 | struct cds_list_head node; /* Channel list in session */ |
49926dbd | 507 | const struct lttng_ust_channel_ops *ops; |
8020ceb5 | 508 | int header_type; /* 0: unset, 1: compact, 2: large */ |
38fae1d3 | 509 | struct lttng_ust_shm_handle *handle; /* shared-memory handle */ |
a3f61e7f | 510 | |
74d81a6c | 511 | /* Channel ID */ |
a3f61e7f | 512 | unsigned int id; |
fd17d7ce | 513 | enum lttng_ust_abi_chan_type type; |
19d8b1b3 | 514 | unsigned char uuid[LTTNG_UST_UUID_LEN]; /* Trace session unique ID */ |
ac6b4ac6 | 515 | int tstate:1; /* Transient enable state */ |
8020ceb5 MD |
516 | }; |
517 | ||
2a9d9339 MD |
518 | /* |
519 | * IMPORTANT: this structure is part of the ABI between the probe and | |
520 | * UST. Fields need to be only added at the end, never reordered, never | |
521 | * removed. | |
522 | * | |
523 | * The field @struct_size should be used to determine the size of the | |
524 | * structure. It should be queried before using additional fields added | |
525 | * at the end of the structure. | |
526 | */ | |
527 | struct lttng_ust_stack_ctx { | |
528 | uint32_t struct_size; /* Size of this structure */ | |
529 | ||
2e70391c | 530 | struct lttng_ust_event_recorder *event_recorder; |
daacdbfc MD |
531 | struct lttng_ust_ctx *chan_ctx; /* RCU dereferenced. */ |
532 | struct lttng_ust_ctx *event_ctx; /* RCU dereferenced. */ | |
2a9d9339 MD |
533 | |
534 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
53569322 MD |
535 | }; |
536 | ||
bdb12629 MD |
537 | struct lttng_ust_session_private; |
538 | ||
180901e6 MD |
539 | /* |
540 | * IMPORTANT: this structure is part of the ABI between the probe and | |
541 | * UST. Fields need to be only added at the end, never reordered, never | |
542 | * removed. | |
6d35572a MD |
543 | * |
544 | * The field @struct_size should be used to determine the size of the | |
545 | * structure. It should be queried before using additional fields added | |
546 | * at the end of the structure. | |
180901e6 | 547 | */ |
7dd08bec | 548 | struct lttng_session { |
bd640d74 | 549 | uint32_t struct_size; /* Size of this structure */ |
bdb12629 MD |
550 | struct lttng_ust_session_private *priv; /* Private session interface */ |
551 | ||
e58095ef | 552 | int active; /* Is trace session active ? */ |
6d35572a MD |
553 | |
554 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
8020ceb5 MD |
555 | }; |
556 | ||
dc11f93f MD |
557 | int lttng_ust_probe_register(struct lttng_ust_probe_desc *desc); |
558 | void lttng_ust_probe_unregister(struct lttng_ust_probe_desc *desc); | |
9f3fdbc6 | 559 | |
fc80554e | 560 | /* |
0af0bdb2 MJ |
561 | * Applications that change their procname and need the new value to be |
562 | * reflected in the procname event context have to call this function to clear | |
563 | * the internally cached value. This should not be called from a signal | |
564 | * handler. | |
fc80554e | 565 | */ |
0af0bdb2 | 566 | void lttng_ust_context_procname_reset(void); |
d58d1454 | 567 | |
6453d237 MD |
568 | #ifdef __cplusplus |
569 | } | |
570 | #endif | |
571 | ||
51489cad | 572 | #endif /* _LTTNG_UST_EVENTS_H */ |