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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 | 43 | struct lttng_channel; |
f69fe5fb | 44 | struct lttng_ust_session; |
4cfec15c | 45 | struct lttng_ust_lib_ring_buffer_ctx; |
25cff019 | 46 | struct lttng_ust_event_field; |
8020ceb5 | 47 | |
37d5e202 MD |
48 | /* |
49 | * Data structures used by tracepoint event declarations, and by the | |
a084756d | 50 | * tracer. |
37d5e202 MD |
51 | */ |
52 | ||
8020ceb5 MD |
53 | /* Type description */ |
54 | ||
a084756d MD |
55 | enum lttng_ust_type { |
56 | lttng_ust_type_integer, | |
57 | lttng_ust_type_string, | |
58 | lttng_ust_type_float, | |
59 | lttng_ust_type_dynamic, | |
60 | lttng_ust_type_enum, | |
61 | lttng_ust_type_array, | |
62 | lttng_ust_type_sequence, | |
63 | lttng_ust_type_struct, | |
64 | NR_LTTNG_UST_TYPE, | |
8020ceb5 MD |
65 | }; |
66 | ||
a084756d MD |
67 | enum lttng_ust_string_encoding { |
68 | lttng_ust_string_encoding_none = 0, | |
69 | lttng_ust_string_encoding_UTF8 = 1, | |
70 | lttng_ust_string_encoding_ASCII = 2, | |
71 | NR_LTTNG_UST_STRING_ENCODING, | |
8020ceb5 MD |
72 | }; |
73 | ||
a6f80644 MD |
74 | struct lttng_enum_value { |
75 | unsigned long long value; | |
76 | unsigned int signedness:1; | |
77 | }; | |
78 | ||
3e762260 PP |
79 | enum lttng_enum_entry_options { |
80 | LTTNG_ENUM_ENTRY_OPTION_IS_AUTO = 1U << 0, | |
81 | }; | |
82 | ||
891d6b55 MD |
83 | /* |
84 | * Enumeration entry description | |
85 | * | |
86 | * IMPORTANT: this structure is part of the ABI between the probe and | |
87 | * UST. Fields need to be only added at the end, never reordered, never | |
88 | * removed. | |
89 | * | |
90 | * The field @struct_size should be used to determine the size of the | |
91 | * structure. It should be queried before using additional fields added | |
92 | * at the end of the structure. | |
93 | */ | |
94 | ||
95 | struct lttng_ust_enum_entry { | |
96 | uint32_t struct_size; | |
97 | ||
a6f80644 | 98 | struct lttng_enum_value start, end; /* start and end are inclusive */ |
8020ceb5 | 99 | const char *string; |
891d6b55 MD |
100 | unsigned int options; |
101 | ||
102 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
8020ceb5 MD |
103 | }; |
104 | ||
a084756d MD |
105 | /* |
106 | * struct lttng_ust_type_common is fixed-size. Its children inherits | |
107 | * from it by embedding struct lttng_ust_type_common as its first field. | |
108 | */ | |
109 | struct lttng_ust_type_common { | |
110 | enum lttng_ust_type type; | |
111 | }; | |
112 | ||
113 | struct lttng_ust_type_integer { | |
114 | struct lttng_ust_type_common parent; | |
115 | uint32_t struct_size; | |
8020ceb5 MD |
116 | unsigned int size; /* in bits */ |
117 | unsigned short alignment; /* in bits */ | |
118 | unsigned int signedness:1; | |
119 | unsigned int reverse_byte_order:1; | |
120 | unsigned int base; /* 2, 8, 10, 16, for pretty print */ | |
a084756d MD |
121 | }; |
122 | ||
123 | #define lttng_ust_type_integer_define(_type, _byte_order, _base) \ | |
124 | ((struct lttng_ust_type_common *) __LTTNG_COMPOUND_LITERAL(struct lttng_ust_type_integer, { \ | |
125 | .parent = { \ | |
126 | .type = lttng_ust_type_integer, \ | |
127 | }, \ | |
128 | .struct_size = sizeof(struct lttng_ust_type_integer), \ | |
129 | .size = sizeof(_type) * CHAR_BIT, \ | |
130 | .alignment = lttng_alignof(_type) * CHAR_BIT, \ | |
131 | .signedness = lttng_is_signed_type(_type), \ | |
132 | .reverse_byte_order = _byte_order != BYTE_ORDER, \ | |
133 | .base = _base, \ | |
134 | })) | |
135 | ||
136 | struct lttng_ust_type_float { | |
137 | struct lttng_ust_type_common parent; | |
138 | uint32_t struct_size; | |
139 | unsigned int exp_dig; /* exponent digits, in bits */ | |
140 | unsigned int mant_dig; /* mantissa digits, in bits */ | |
141 | unsigned short alignment; /* in bits */ | |
142 | unsigned int reverse_byte_order:1; | |
8020ceb5 MD |
143 | }; |
144 | ||
d3ed854b MD |
145 | /* |
146 | * Only float and double are supported. long double is not supported at | |
147 | * the moment. | |
148 | */ | |
20f1eee7 MD |
149 | #define _float_mant_dig(_type) \ |
150 | (sizeof(_type) == sizeof(float) ? FLT_MANT_DIG \ | |
151 | : (sizeof(_type) == sizeof(double) ? DBL_MANT_DIG \ | |
d3ed854b | 152 | : 0)) |
20f1eee7 | 153 | |
a084756d MD |
154 | #define lttng_ust_type_float_define(_type) \ |
155 | ((struct lttng_ust_type_common *) __LTTNG_COMPOUND_LITERAL(struct lttng_ust_type_float, { \ | |
156 | .parent = { \ | |
157 | .type = lttng_ust_type_float, \ | |
158 | }, \ | |
159 | .struct_size = sizeof(struct lttng_ust_type_float), \ | |
160 | .exp_dig = sizeof(_type) * CHAR_BIT \ | |
161 | - _float_mant_dig(_type), \ | |
162 | .mant_dig = _float_mant_dig(_type), \ | |
163 | .alignment = lttng_alignof(_type) * CHAR_BIT, \ | |
164 | .reverse_byte_order = BYTE_ORDER != FLOAT_WORD_ORDER, \ | |
165 | })) | |
166 | ||
167 | ||
168 | struct lttng_ust_type_string { | |
169 | struct lttng_ust_type_common parent; | |
170 | uint32_t struct_size; | |
171 | enum lttng_ust_string_encoding encoding; | |
20f1eee7 MD |
172 | }; |
173 | ||
a084756d MD |
174 | struct lttng_ust_type_enum { |
175 | struct lttng_ust_type_common parent; | |
176 | uint32_t struct_size; | |
177 | struct lttng_ust_enum_desc *desc; /* Enumeration mapping */ | |
178 | struct lttng_ust_type_common *container_type; | |
179 | }; | |
180 | ||
181 | struct lttng_ust_type_array { | |
182 | struct lttng_ust_type_common parent; | |
183 | uint32_t struct_size; | |
184 | struct lttng_ust_type_common *elem_type; | |
185 | unsigned int length; /* Num. elems. */ | |
186 | unsigned int alignment; | |
187 | enum lttng_ust_string_encoding encoding; | |
188 | }; | |
189 | ||
190 | struct lttng_ust_type_sequence { | |
191 | struct lttng_ust_type_common parent; | |
192 | uint32_t struct_size; | |
193 | const char *length_name; /* Length field name. */ | |
194 | struct lttng_ust_type_common *elem_type; | |
195 | unsigned int alignment; /* Alignment before elements. */ | |
196 | enum lttng_ust_string_encoding encoding; | |
197 | }; | |
198 | ||
199 | struct lttng_ust_type_struct { | |
200 | struct lttng_ust_type_common parent; | |
201 | uint32_t struct_size; | |
202 | unsigned int nr_fields; | |
203 | struct lttng_ust_event_field **fields; /* Array of pointers to fields. */ | |
204 | unsigned int alignment; | |
8020ceb5 MD |
205 | }; |
206 | ||
891d6b55 MD |
207 | /* |
208 | * Enumeration description | |
209 | * | |
210 | * IMPORTANT: this structure is part of the ABI between the probe and | |
211 | * UST. Fields need to be only added at the end, never reordered, never | |
212 | * removed. | |
213 | * | |
214 | * The field @struct_size should be used to determine the size of the | |
215 | * structure. It should be queried before using additional fields added | |
216 | * at the end of the structure. | |
217 | */ | |
218 | ||
219 | struct lttng_ust_enum_desc { | |
220 | uint32_t struct_size; | |
221 | ||
8020ceb5 | 222 | const char *name; |
a084756d | 223 | struct lttng_ust_enum_entry **entries; |
c785c634 | 224 | unsigned int nr_entries; |
891d6b55 MD |
225 | |
226 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
8020ceb5 MD |
227 | }; |
228 | ||
180901e6 MD |
229 | /* |
230 | * Event field description | |
231 | * | |
232 | * IMPORTANT: this structure is part of the ABI between the probe and | |
233 | * UST. Fields need to be only added at the end, never reordered, never | |
234 | * removed. | |
25cff019 MD |
235 | * |
236 | * The field @struct_size should be used to determine the size of the | |
237 | * structure. It should be queried before using additional fields added | |
238 | * at the end of the structure. | |
180901e6 | 239 | */ |
8020ceb5 | 240 | |
25cff019 MD |
241 | struct lttng_ust_event_field { |
242 | uint32_t struct_size; | |
243 | ||
8020ceb5 | 244 | const char *name; |
a084756d | 245 | struct lttng_ust_type_common *type; |
25cff019 MD |
246 | unsigned int nowrite:1, /* do not write into trace */ |
247 | nofilter:1; /* do not consider for filter */ | |
248 | ||
249 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
8020ceb5 MD |
250 | }; |
251 | ||
37d5e202 | 252 | |
dc11f93f MD |
253 | /* |
254 | * IMPORTANT: this structure is part of the ABI between the probe and | |
255 | * UST. Fields need to be only added at the end, never reordered, never | |
256 | * removed. | |
257 | * | |
258 | * The field @struct_size should be used to determine the size of the | |
259 | * structure. It should be queried before using additional fields added | |
260 | * at the end of the structure. | |
261 | */ | |
262 | struct lttng_ust_event_desc { | |
263 | uint32_t struct_size; /* Size of this structure. */ | |
dc177d11 | 264 | |
37d5e202 | 265 | const char *name; |
fbdeb5ec | 266 | void (*probe_callback)(void); |
a084756d MD |
267 | struct lttng_event_ctx *ctx; /* context */ |
268 | struct lttng_ust_event_field **fields; /* event payload */ | |
37d5e202 MD |
269 | unsigned int nr_fields; |
270 | const int **loglevel; | |
dc11f93f MD |
271 | const char *signature; /* Argument types/names received */ |
272 | const char **model_emf_uri; | |
273 | ||
274 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
37d5e202 MD |
275 | }; |
276 | ||
dc11f93f MD |
277 | /* |
278 | * IMPORTANT: this structure is part of the ABI between the probe and | |
279 | * UST. Fields need to be only added at the end, never reordered, never | |
280 | * removed. | |
281 | * | |
282 | * The field @struct_size should be used to determine the size of the | |
283 | * structure. It should be queried before using additional fields added | |
284 | * at the end of the structure. | |
285 | */ | |
286 | struct lttng_ust_probe_desc { | |
287 | uint32_t struct_size; /* Size of this structure. */ | |
288 | ||
37d5e202 | 289 | const char *provider; |
a084756d | 290 | struct lttng_ust_event_desc **event_desc; |
37d5e202 MD |
291 | unsigned int nr_events; |
292 | struct cds_list_head head; /* chain registered probes */ | |
6715d7d1 MD |
293 | struct cds_list_head lazy_init_head; |
294 | int lazy; /* lazy registration */ | |
71d31690 MD |
295 | uint32_t major; |
296 | uint32_t minor; | |
dc11f93f MD |
297 | |
298 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
8020ceb5 MD |
299 | }; |
300 | ||
37d5e202 MD |
301 | /* Data structures used by the tracer. */ |
302 | ||
8a92ed2a | 303 | /* |
04aa13f8 | 304 | * Bytecode interpreter return value masks. |
8a92ed2a | 305 | */ |
04aa13f8 FD |
306 | enum lttng_bytecode_interpreter_ret { |
307 | LTTNG_INTERPRETER_DISCARD = 0, | |
308 | LTTNG_INTERPRETER_RECORD_FLAG = (1ULL << 0), | |
8a92ed2a MD |
309 | /* Other bits are kept for future use. */ |
310 | }; | |
311 | ||
d37ecb3f | 312 | struct lttng_interpreter_output; |
362a65de | 313 | struct lttng_ust_bytecode_runtime_private; |
d37ecb3f | 314 | |
73d37531 | 315 | /* |
5469a374 MD |
316 | * IMPORTANT: this structure is part of the ABI between the probe and |
317 | * UST. Fields need to be only added at the end, never reordered, never | |
318 | * removed. | |
319 | * | |
320 | * The field @struct_size should be used to determine the size of the | |
321 | * structure. It should be queried before using additional fields added | |
322 | * at the end of the structure. | |
73d37531 | 323 | */ |
5469a374 MD |
324 | struct lttng_ust_bytecode_runtime { |
325 | uint32_t struct_size; /* Size of this structure. */ | |
362a65de | 326 | |
5469a374 | 327 | struct lttng_ust_bytecode_runtime_private *priv; |
f488575f | 328 | /* Associated bytecode */ |
c42416df FD |
329 | union { |
330 | uint64_t (*filter)(void *interpreter_data, | |
331 | const char *interpreter_stack_data); | |
d37ecb3f FD |
332 | uint64_t (*capture)(void *interpreter_data, |
333 | const char *interpreter_stack_data, | |
334 | struct lttng_interpreter_output *interpreter_output); | |
c42416df | 335 | } interpreter_funcs; |
e58095ef | 336 | struct cds_list_head node; /* list of bytecode runtime in event */ |
5469a374 MD |
337 | |
338 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
e58095ef MD |
339 | }; |
340 | ||
8020ceb5 | 341 | /* |
7dd08bec MD |
342 | * lttng_event structure is referred to by the tracing fast path. It |
343 | * must be kept small. | |
180901e6 MD |
344 | * |
345 | * IMPORTANT: this structure is part of the ABI between the probe and | |
346 | * UST. Fields need to be only added at the end, never reordered, never | |
347 | * removed. | |
8020ceb5 | 348 | */ |
68bb7559 | 349 | |
daacdbfc | 350 | struct lttng_ust_ctx; |
80333dfa MD |
351 | struct lttng_ust_event_common_private; |
352 | ||
808edfc8 MD |
353 | enum lttng_ust_event_type { |
354 | LTTNG_UST_EVENT_TYPE_RECORDER = 0, | |
355 | LTTNG_UST_EVENT_TYPE_NOTIFIER = 1, | |
356 | }; | |
357 | ||
93cfd247 | 358 | /* |
6d35572a MD |
359 | * IMPORTANT: this structure is part of the ABI between the probe and |
360 | * UST. Fields need to be only added at the end, never reordered, never | |
361 | * removed. | |
362 | * | |
93cfd247 MD |
363 | * struct lttng_ust_event_common is the common ancestor of the various |
364 | * public event actions. Inheritance is done by composition: The parent | |
365 | * has a pointer to its child, and the child has a pointer to its | |
366 | * parent. Inheritance of those public structures is done by composition | |
367 | * to ensure both parent and child structures can be extended. | |
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 | */ | |
7ee76145 | 373 | struct lttng_ust_event_common { |
80333dfa | 374 | uint32_t struct_size; /* Size of this structure. */ |
dc177d11 | 375 | |
80333dfa MD |
376 | struct lttng_ust_event_common_private *priv; /* Private event interface */ |
377 | ||
808edfc8 | 378 | enum lttng_ust_event_type type; |
ba99fbe2 MD |
379 | void *child; /* Pointer to child, for inheritance by aggregation. */ |
380 | ||
80333dfa MD |
381 | int enabled; |
382 | int has_enablers_without_bytecode; | |
5469a374 | 383 | /* list of struct lttng_ust_bytecode_runtime, sorted by seqnum */ |
80333dfa | 384 | struct cds_list_head filter_bytecode_runtime_head; |
93cfd247 MD |
385 | |
386 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
80333dfa MD |
387 | }; |
388 | ||
2e70391c | 389 | struct lttng_ust_event_recorder_private; |
68bb7559 | 390 | |
93cfd247 | 391 | /* |
6d35572a MD |
392 | * IMPORTANT: this structure is part of the ABI between the probe and |
393 | * UST. Fields need to be only added at the end, never reordered, never | |
394 | * removed. | |
395 | * | |
93cfd247 MD |
396 | * struct lttng_ust_event_recorder is the action for recording events |
397 | * into a ring buffer. It inherits from struct lttng_ust_event_common | |
398 | * by composition to ensure both parent and child structure are | |
399 | * extensible. | |
400 | * | |
401 | * The field @struct_size should be used to determine the size of the | |
402 | * structure. It should be queried before using additional fields added | |
403 | * at the end of the structure. | |
404 | */ | |
2e70391c MD |
405 | struct lttng_ust_event_recorder { |
406 | uint32_t struct_size; /* Size of this structure. */ | |
dc177d11 | 407 | |
ba99fbe2 | 408 | struct lttng_ust_event_common *parent; /* Inheritance by aggregation. */ |
2e70391c | 409 | struct lttng_ust_event_recorder_private *priv; /* Private event record interface */ |
68bb7559 | 410 | |
8020ceb5 | 411 | unsigned int id; |
68bb7559 | 412 | struct lttng_channel *chan; |
daacdbfc | 413 | struct lttng_ust_ctx *ctx; |
93cfd247 MD |
414 | |
415 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
8020ceb5 MD |
416 | }; |
417 | ||
115db533 MD |
418 | struct lttng_ust_event_notifier_private; |
419 | ||
93cfd247 | 420 | /* |
6d35572a MD |
421 | * IMPORTANT: this structure is part of the ABI between the probe and |
422 | * UST. Fields need to be only added at the end, never reordered, never | |
423 | * removed. | |
424 | * | |
93cfd247 MD |
425 | * struct lttng_ust_event_notifier is the action for sending |
426 | * notifications. It inherits from struct lttng_ust_event_common | |
427 | * by composition to ensure both parent and child structure are | |
428 | * extensible. | |
429 | * | |
430 | * The field @struct_size should be used to determine the size of the | |
431 | * structure. It should be queried before using additional fields added | |
432 | * at the end of the structure. | |
433 | */ | |
d7d45c0d | 434 | struct lttng_ust_event_notifier { |
115db533 | 435 | uint32_t struct_size; /* Size of this structure. */ |
105cf2eb | 436 | |
ba99fbe2 | 437 | struct lttng_ust_event_common *parent; /* Inheritance by aggregation. */ |
115db533 MD |
438 | struct lttng_ust_event_notifier_private *priv; /* Private event notifier interface */ |
439 | ||
d7d45c0d | 440 | void (*notification_send)(struct lttng_ust_event_notifier *event_notifier, |
cab88ff8 | 441 | const char *stack_data); |
d37ecb3f | 442 | struct cds_list_head capture_bytecode_runtime_head; |
93cfd247 MD |
443 | |
444 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
d8d2416d FD |
445 | }; |
446 | ||
5198080d | 447 | struct lttng_ust_lib_ring_buffer_channel; |
38fae1d3 | 448 | struct lttng_ust_shm_handle; |
a880bae5 | 449 | struct lttng_ust_channel_ops_private; |
8d8a24c8 | 450 | |
180901e6 MD |
451 | /* |
452 | * IMPORTANT: this structure is part of the ABI between the probe and | |
453 | * UST. Fields need to be only added at the end, never reordered, never | |
454 | * removed. | |
49926dbd MD |
455 | * |
456 | * The field @struct_size should be used to determine the size of the | |
457 | * structure. It should be queried before using additional fields added | |
458 | * at the end of the structure. | |
180901e6 | 459 | */ |
49926dbd MD |
460 | struct lttng_ust_channel_ops { |
461 | uint32_t struct_size; | |
462 | ||
a880bae5 MD |
463 | struct lttng_ust_channel_ops_private *priv; /* Private channel ops interface */ |
464 | ||
4cfec15c | 465 | int (*event_reserve)(struct lttng_ust_lib_ring_buffer_ctx *ctx, |
8020ceb5 | 466 | uint32_t event_id); |
4cfec15c | 467 | void (*event_commit)(struct lttng_ust_lib_ring_buffer_ctx *ctx); |
74d81a6c MD |
468 | void (*event_write)(struct lttng_ust_lib_ring_buffer_ctx *ctx, |
469 | const void *src, size_t len); | |
a44c74d9 MD |
470 | void (*event_strcpy)(struct lttng_ust_lib_ring_buffer_ctx *ctx, |
471 | const char *src, size_t len); | |
49926dbd MD |
472 | |
473 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
8020ceb5 MD |
474 | }; |
475 | ||
180901e6 MD |
476 | /* |
477 | * IMPORTANT: this structure is part of the ABI between the probe and | |
478 | * UST. Fields need to be only added at the end, never reordered, never | |
479 | * removed. | |
480 | */ | |
7dd08bec | 481 | struct lttng_channel { |
a3f61e7f MD |
482 | /* |
483 | * The pointers located in this private data are NOT safe to be | |
484 | * dereferenced by the consumer. The only operations the | |
485 | * consumer process is designed to be allowed to do is to read | |
486 | * and perform subbuffer flush. | |
487 | */ | |
5198080d | 488 | struct lttng_ust_lib_ring_buffer_channel *chan; /* Channel buffers */ |
976fe9ea | 489 | int enabled; |
daacdbfc | 490 | struct lttng_ust_ctx *ctx; |
8020ceb5 | 491 | /* Event ID management */ |
f69fe5fb | 492 | struct lttng_ust_session *session; |
0a42beb6 | 493 | int objd; /* Object associated to channel */ |
e58095ef | 494 | struct cds_list_head node; /* Channel list in session */ |
a084756d | 495 | struct lttng_ust_channel_ops *ops; |
8020ceb5 | 496 | int header_type; /* 0: unset, 1: compact, 2: large */ |
38fae1d3 | 497 | struct lttng_ust_shm_handle *handle; /* shared-memory handle */ |
a3f61e7f | 498 | |
74d81a6c | 499 | /* Channel ID */ |
a3f61e7f | 500 | unsigned int id; |
fd17d7ce | 501 | enum lttng_ust_abi_chan_type type; |
19d8b1b3 | 502 | unsigned char uuid[LTTNG_UST_UUID_LEN]; /* Trace session unique ID */ |
ac6b4ac6 | 503 | int tstate:1; /* Transient enable state */ |
8020ceb5 MD |
504 | }; |
505 | ||
2a9d9339 MD |
506 | /* |
507 | * IMPORTANT: this structure is part of the ABI between the probe and | |
508 | * UST. Fields need to be only added at the end, never reordered, never | |
509 | * removed. | |
510 | * | |
511 | * The field @struct_size should be used to determine the size of the | |
512 | * structure. It should be queried before using additional fields added | |
513 | * at the end of the structure. | |
514 | */ | |
515 | struct lttng_ust_stack_ctx { | |
516 | uint32_t struct_size; /* Size of this structure */ | |
517 | ||
2e70391c | 518 | struct lttng_ust_event_recorder *event_recorder; |
daacdbfc MD |
519 | struct lttng_ust_ctx *chan_ctx; /* RCU dereferenced. */ |
520 | struct lttng_ust_ctx *event_ctx; /* RCU dereferenced. */ | |
2a9d9339 MD |
521 | |
522 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
53569322 MD |
523 | }; |
524 | ||
bdb12629 MD |
525 | struct lttng_ust_session_private; |
526 | ||
180901e6 MD |
527 | /* |
528 | * IMPORTANT: this structure is part of the ABI between the probe and | |
529 | * UST. Fields need to be only added at the end, never reordered, never | |
530 | * removed. | |
6d35572a MD |
531 | * |
532 | * The field @struct_size should be used to determine the size of the | |
533 | * structure. It should be queried before using additional fields added | |
534 | * at the end of the structure. | |
180901e6 | 535 | */ |
f69fe5fb | 536 | struct lttng_ust_session { |
bd640d74 | 537 | uint32_t struct_size; /* Size of this structure */ |
dc177d11 | 538 | |
bdb12629 MD |
539 | struct lttng_ust_session_private *priv; /* Private session interface */ |
540 | ||
e58095ef | 541 | int active; /* Is trace session active ? */ |
6d35572a MD |
542 | |
543 | /* End of base ABI. Fields below should be used after checking struct_size. */ | |
8020ceb5 MD |
544 | }; |
545 | ||
dc11f93f MD |
546 | int lttng_ust_probe_register(struct lttng_ust_probe_desc *desc); |
547 | void lttng_ust_probe_unregister(struct lttng_ust_probe_desc *desc); | |
9f3fdbc6 | 548 | |
fc80554e | 549 | /* |
0af0bdb2 MJ |
550 | * Applications that change their procname and need the new value to be |
551 | * reflected in the procname event context have to call this function to clear | |
552 | * the internally cached value. This should not be called from a signal | |
553 | * handler. | |
fc80554e | 554 | */ |
0af0bdb2 | 555 | void lttng_ust_context_procname_reset(void); |
d58d1454 | 556 | |
6453d237 MD |
557 | #ifdef __cplusplus |
558 | } | |
559 | #endif | |
560 | ||
51489cad | 561 | #endif /* _LTTNG_UST_EVENTS_H */ |