Remove forward decl for unused 'struct lttng_ust_context_app'
[lttng-ust.git] / include / lttng / ust-events.h
1 /*
2 * SPDX-License-Identifier: MIT
3 *
4 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 *
6 * Holds LTTng per-session event registry.
7 */
8
9 #ifndef _LTTNG_UST_EVENTS_H
10 #define _LTTNG_UST_EVENTS_H
11
12 #include <urcu/list.h>
13 #include <urcu/hlist.h>
14 #include <stddef.h>
15 #include <stdint.h>
16 #include <lttng/ust-abi.h>
17 #include <lttng/ust-tracer.h>
18 #include <lttng/ust-endian.h>
19 #include <float.h>
20 #include <errno.h>
21 #include <urcu/ref.h>
22 #include <pthread.h>
23
24 #ifndef LTTNG_PACKED
25 #error "LTTNG_PACKED should be defined"
26 #endif
27
28 #ifdef __cplusplus
29 extern "C" {
30 #endif
31
32 #define LTTNG_UST_UUID_LEN 16
33
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 */
40 #define LTTNG_UST_PROVIDER_MAJOR 2
41 #define LTTNG_UST_PROVIDER_MINOR 0
42
43 struct lttng_channel;
44 struct lttng_session;
45 struct lttng_ust_lib_ring_buffer_ctx;
46 struct lttng_event_field;
47 struct lttng_event_notifier;
48 struct lttng_event_notifier_group;
49
50 /*
51 * Data structures used by tracepoint event declarations, and by the
52 * tracer. Those structures have padding for future extension.
53 */
54
55 /* Type description */
56
57 /* Update the astract_types name table in lttng-types.c along with this enum */
58 enum lttng_abstract_types {
59 atype_integer,
60 atype_enum, /* legacy */
61 atype_array, /* legacy */
62 atype_sequence, /* legacy */
63 atype_string,
64 atype_float,
65 atype_dynamic,
66 atype_struct, /* legacy */
67 atype_enum_nestable,
68 atype_array_nestable,
69 atype_sequence_nestable,
70 atype_struct_nestable,
71 NR_ABSTRACT_TYPES,
72 };
73
74 /* Update the string_encodings name table in lttng-types.c along with this enum */
75 enum lttng_string_encodings {
76 lttng_encode_none = 0,
77 lttng_encode_UTF8 = 1,
78 lttng_encode_ASCII = 2,
79 NR_STRING_ENCODINGS,
80 };
81
82 struct lttng_enum_value {
83 unsigned long long value;
84 unsigned int signedness:1;
85 };
86
87 enum lttng_enum_entry_options {
88 LTTNG_ENUM_ENTRY_OPTION_IS_AUTO = 1U << 0,
89 };
90
91 #define LTTNG_UST_ENUM_ENTRY_PADDING 16
92 struct lttng_enum_entry {
93 struct lttng_enum_value start, end; /* start and end are inclusive */
94 const char *string;
95 union {
96 struct {
97 unsigned int options;
98 } LTTNG_PACKED extra;
99 char padding[LTTNG_UST_ENUM_ENTRY_PADDING];
100 } u;
101 };
102
103 #define __type_integer(_type, _byte_order, _base, _encoding) \
104 { \
105 .atype = atype_integer, \
106 .u = \
107 { \
108 .integer = \
109 { \
110 .size = sizeof(_type) * CHAR_BIT, \
111 .alignment = lttng_alignof(_type) * CHAR_BIT, \
112 .signedness = lttng_is_signed_type(_type), \
113 .reverse_byte_order = _byte_order != BYTE_ORDER, \
114 .base = _base, \
115 .encoding = lttng_encode_##_encoding, \
116 } \
117 }, \
118 } \
119
120 #define LTTNG_UST_INTEGER_TYPE_PADDING 24
121 struct lttng_integer_type {
122 unsigned int size; /* in bits */
123 unsigned short alignment; /* in bits */
124 unsigned int signedness:1;
125 unsigned int reverse_byte_order:1;
126 unsigned int base; /* 2, 8, 10, 16, for pretty print */
127 enum lttng_string_encodings encoding;
128 char padding[LTTNG_UST_INTEGER_TYPE_PADDING];
129 };
130
131 /*
132 * Only float and double are supported. long double is not supported at
133 * the moment.
134 */
135 #define _float_mant_dig(_type) \
136 (sizeof(_type) == sizeof(float) ? FLT_MANT_DIG \
137 : (sizeof(_type) == sizeof(double) ? DBL_MANT_DIG \
138 : 0))
139
140 #define __type_float(_type) \
141 { \
142 .atype = atype_float, \
143 .u = \
144 { \
145 ._float = \
146 { \
147 .exp_dig = sizeof(_type) * CHAR_BIT \
148 - _float_mant_dig(_type), \
149 .mant_dig = _float_mant_dig(_type), \
150 .alignment = lttng_alignof(_type) * CHAR_BIT, \
151 .reverse_byte_order = BYTE_ORDER != FLOAT_WORD_ORDER, \
152 } \
153 } \
154 } \
155
156 #define LTTNG_UST_FLOAT_TYPE_PADDING 24
157 struct lttng_float_type {
158 unsigned int exp_dig; /* exponent digits, in bits */
159 unsigned int mant_dig; /* mantissa digits, in bits */
160 unsigned short alignment; /* in bits */
161 unsigned int reverse_byte_order:1;
162 char padding[LTTNG_UST_FLOAT_TYPE_PADDING];
163 };
164
165 /* legacy */
166 #define LTTNG_UST_BASIC_TYPE_PADDING 128
167 union _lttng_basic_type {
168 struct lttng_integer_type integer; /* legacy */
169 struct {
170 const struct lttng_enum_desc *desc; /* Enumeration mapping */
171 struct lttng_integer_type container_type;
172 } enumeration; /* legacy */
173 struct {
174 enum lttng_string_encodings encoding;
175 } string; /* legacy */
176 struct lttng_float_type _float; /* legacy */
177 char padding[LTTNG_UST_BASIC_TYPE_PADDING];
178 };
179
180 /* legacy */
181 struct lttng_basic_type {
182 enum lttng_abstract_types atype;
183 union {
184 union _lttng_basic_type basic;
185 } u;
186 };
187
188 #define LTTNG_UST_TYPE_PADDING 128
189 struct lttng_type {
190 enum lttng_abstract_types atype;
191 union {
192 /* provider ABI 2.0 */
193 struct lttng_integer_type integer;
194 struct lttng_float_type _float;
195 struct {
196 enum lttng_string_encodings encoding;
197 } string;
198 struct {
199 const struct lttng_enum_desc *desc; /* Enumeration mapping */
200 struct lttng_type *container_type;
201 } enum_nestable;
202 struct {
203 const struct lttng_type *elem_type;
204 unsigned int length; /* Num. elems. */
205 unsigned int alignment;
206 } array_nestable;
207 struct {
208 const char *length_name; /* Length field name. */
209 const struct lttng_type *elem_type;
210 unsigned int alignment; /* Alignment before elements. */
211 } sequence_nestable;
212 struct {
213 unsigned int nr_fields;
214 const struct lttng_event_field *fields; /* Array of fields. */
215 unsigned int alignment;
216 } struct_nestable;
217
218 union {
219 /* legacy provider ABI 1.0 */
220 union _lttng_basic_type basic; /* legacy */
221 struct {
222 struct lttng_basic_type elem_type;
223 unsigned int length; /* Num. elems. */
224 } array; /* legacy */
225 struct {
226 struct lttng_basic_type length_type;
227 struct lttng_basic_type elem_type;
228 } sequence; /* legacy */
229 struct {
230 unsigned int nr_fields;
231 struct lttng_event_field *fields; /* Array of fields. */
232 } _struct; /* legacy */
233 } legacy;
234 char padding[LTTNG_UST_TYPE_PADDING];
235 } u;
236 };
237
238 #define LTTNG_UST_ENUM_TYPE_PADDING 24
239 struct lttng_enum_desc {
240 const char *name;
241 const struct lttng_enum_entry *entries;
242 unsigned int nr_entries;
243 char padding[LTTNG_UST_ENUM_TYPE_PADDING];
244 };
245
246 /*
247 * Event field description
248 *
249 * IMPORTANT: this structure is part of the ABI between the probe and
250 * UST. Fields need to be only added at the end, never reordered, never
251 * removed.
252 */
253
254 #define LTTNG_UST_EVENT_FIELD_PADDING 28
255 struct lttng_event_field {
256 const char *name;
257 struct lttng_type type;
258 unsigned int nowrite; /* do not write into trace */
259 union {
260 struct {
261 unsigned int nofilter:1; /* do not consider for filter */
262 } ext;
263 char padding[LTTNG_UST_EVENT_FIELD_PADDING];
264 } u;
265 };
266
267 enum lttng_ust_dynamic_type {
268 LTTNG_UST_DYNAMIC_TYPE_NONE,
269 LTTNG_UST_DYNAMIC_TYPE_S8,
270 LTTNG_UST_DYNAMIC_TYPE_S16,
271 LTTNG_UST_DYNAMIC_TYPE_S32,
272 LTTNG_UST_DYNAMIC_TYPE_S64,
273 LTTNG_UST_DYNAMIC_TYPE_U8,
274 LTTNG_UST_DYNAMIC_TYPE_U16,
275 LTTNG_UST_DYNAMIC_TYPE_U32,
276 LTTNG_UST_DYNAMIC_TYPE_U64,
277 LTTNG_UST_DYNAMIC_TYPE_FLOAT,
278 LTTNG_UST_DYNAMIC_TYPE_DOUBLE,
279 LTTNG_UST_DYNAMIC_TYPE_STRING,
280 _NR_LTTNG_UST_DYNAMIC_TYPES,
281 };
282
283 struct lttng_ctx_value {
284 enum lttng_ust_dynamic_type sel;
285 union {
286 int64_t s64;
287 uint64_t u64;
288 const char *str;
289 double d;
290 } u;
291 };
292
293 struct lttng_perf_counter_field;
294
295 #define LTTNG_UST_CTX_FIELD_PADDING 40
296 struct lttng_ctx_field {
297 struct lttng_event_field event_field;
298 size_t (*get_size)(struct lttng_ctx_field *field, size_t offset);
299 void (*record)(struct lttng_ctx_field *field,
300 struct lttng_ust_lib_ring_buffer_ctx *ctx,
301 struct lttng_channel *chan);
302 void (*get_value)(struct lttng_ctx_field *field,
303 struct lttng_ctx_value *value);
304 union {
305 struct lttng_perf_counter_field *perf_counter;
306 char padding[LTTNG_UST_CTX_FIELD_PADDING];
307 } u;
308 void (*destroy)(struct lttng_ctx_field *field);
309 char *field_name; /* Has ownership, dynamically allocated. */
310 };
311
312 #define LTTNG_UST_CTX_PADDING 20
313 struct lttng_ctx {
314 struct lttng_ctx_field *fields;
315 unsigned int nr_fields;
316 unsigned int allocated_fields;
317 unsigned int largest_align;
318 char padding[LTTNG_UST_CTX_PADDING];
319 };
320
321 #define LTTNG_UST_EVENT_DESC_PADDING 40
322 struct lttng_event_desc {
323 const char *name;
324 void (*probe_callback)(void);
325 const struct lttng_event_ctx *ctx; /* context */
326 const struct lttng_event_field *fields; /* event payload */
327 unsigned int nr_fields;
328 const int **loglevel;
329 const char *signature; /* Argument types/names received */
330 union {
331 struct {
332 const char **model_emf_uri;
333 void (*event_notifier_callback)(void);
334 } ext;
335 char padding[LTTNG_UST_EVENT_DESC_PADDING];
336 } u;
337 };
338
339 #define LTTNG_UST_PROBE_DESC_PADDING 12
340 struct lttng_probe_desc {
341 const char *provider;
342 const struct lttng_event_desc **event_desc;
343 unsigned int nr_events;
344 struct cds_list_head head; /* chain registered probes */
345 struct cds_list_head lazy_init_head;
346 int lazy; /* lazy registration */
347 uint32_t major;
348 uint32_t minor;
349 char padding[LTTNG_UST_PROBE_DESC_PADDING];
350 };
351
352 /* Data structures used by the tracer. */
353
354 struct tp_list_entry {
355 struct lttng_ust_tracepoint_iter tp;
356 struct cds_list_head head;
357 };
358
359 struct lttng_ust_tracepoint_list {
360 struct tp_list_entry *iter;
361 struct cds_list_head head;
362 };
363
364 struct tp_field_list_entry {
365 struct lttng_ust_field_iter field;
366 struct cds_list_head head;
367 };
368
369 struct lttng_ust_field_list {
370 struct tp_field_list_entry *iter;
371 struct cds_list_head head;
372 };
373
374 struct ust_pending_probe;
375 struct lttng_event;
376
377 /*
378 * Bytecode interpreter return value masks.
379 */
380 enum lttng_bytecode_interpreter_ret {
381 LTTNG_INTERPRETER_DISCARD = 0,
382 LTTNG_INTERPRETER_RECORD_FLAG = (1ULL << 0),
383 /* Other bits are kept for future use. */
384 };
385
386 struct lttng_interpreter_output;
387
388 /*
389 * This structure is used in the probes. More specifically, the `filter` and
390 * `node` fields are explicity used in the probes. When modifying this
391 * structure we must not change the layout of these two fields as it is
392 * considered ABI.
393 */
394 struct lttng_bytecode_runtime {
395 /* Associated bytecode */
396 struct lttng_ust_bytecode_node *bc;
397 union {
398 uint64_t (*filter)(void *interpreter_data,
399 const char *interpreter_stack_data);
400 uint64_t (*capture)(void *interpreter_data,
401 const char *interpreter_stack_data,
402 struct lttng_interpreter_output *interpreter_output);
403 } interpreter_funcs;
404 int link_failed;
405 struct cds_list_head node; /* list of bytecode runtime in event */
406 /*
407 * Pointer to a URCU-protected pointer owned by an `struct
408 * lttng_session`or `struct lttng_event_notifier_group`.
409 */
410 struct lttng_ctx **pctx;
411 };
412
413 /*
414 * Objects in a linked-list of enablers, owned by an event or event_notifier.
415 * This is used because an event (or a event_notifier) can be enabled by more
416 * than one enabler and we want a quick way to iterate over all enablers of an
417 * object.
418 *
419 * For example, event rules "my_app:a*" and "my_app:ab*" will both match the
420 * event with the name "my_app:abc".
421 */
422 struct lttng_enabler_ref {
423 struct cds_list_head node; /* enabler ref list */
424 struct lttng_enabler *ref; /* backward ref */
425 };
426
427 /*
428 * lttng_event structure is referred to by the tracing fast path. It
429 * must be kept small.
430 *
431 * IMPORTANT: this structure is part of the ABI between the probe and
432 * UST. Fields need to be only added at the end, never reordered, never
433 * removed.
434 */
435 struct lttng_event {
436 unsigned int id;
437 struct lttng_channel *chan;
438 int enabled;
439 const struct lttng_event_desc *desc;
440 struct lttng_ctx *ctx;
441 enum lttng_ust_instrumentation instrumentation;
442 struct cds_list_head node; /* Event list in session */
443
444 /* list of struct lttng_bytecode_runtime, sorted by seqnum */
445 struct cds_list_head filter_bytecode_runtime_head;
446 int has_enablers_without_bytecode;
447 /* Backward references: list of lttng_enabler_ref (ref to enablers) */
448 struct cds_list_head enablers_ref_head;
449 struct cds_hlist_node hlist; /* session ht of events */
450 int registered; /* has reg'd tracepoint probe */
451 };
452
453 struct lttng_event_notifier {
454 uint64_t user_token;
455 uint64_t error_counter_index;
456 int enabled;
457 int registered; /* has reg'd tracepoint probe */
458 size_t num_captures; /* Needed to allocate the msgpack array. */
459 void (*notification_send)(struct lttng_event_notifier *event_notifier,
460 const char *stack_data);
461 struct cds_list_head filter_bytecode_runtime_head;
462 struct cds_list_head capture_bytecode_runtime_head;
463 int has_enablers_without_bytecode;
464 struct cds_list_head enablers_ref_head;
465 const struct lttng_event_desc *desc;
466 struct cds_hlist_node hlist; /* hashtable of event_notifiers */
467 struct cds_list_head node; /* event_notifier list in session */
468 struct lttng_event_notifier_group *group; /* weak ref */
469 };
470
471 struct lttng_enum {
472 const struct lttng_enum_desc *desc;
473 struct lttng_session *session;
474 struct cds_list_head node; /* Enum list in session */
475 struct cds_hlist_node hlist; /* Session ht of enums */
476 uint64_t id; /* Enumeration ID in sessiond */
477 };
478
479 struct channel;
480 struct lttng_ust_shm_handle;
481
482 /*
483 * IMPORTANT: this structure is part of the ABI between the probe and
484 * UST. Fields need to be only added at the end, never reordered, never
485 * removed.
486 */
487 struct lttng_channel_ops {
488 struct lttng_channel *(*channel_create)(const char *name,
489 void *buf_addr,
490 size_t subbuf_size, size_t num_subbuf,
491 unsigned int switch_timer_interval,
492 unsigned int read_timer_interval,
493 unsigned char *uuid,
494 uint32_t chan_id,
495 const int *stream_fds, int nr_stream_fds,
496 int64_t blocking_timeout);
497 void (*channel_destroy)(struct lttng_channel *chan);
498 int (*event_reserve)(struct lttng_ust_lib_ring_buffer_ctx *ctx,
499 uint32_t event_id);
500 void (*event_commit)(struct lttng_ust_lib_ring_buffer_ctx *ctx);
501 void (*event_write)(struct lttng_ust_lib_ring_buffer_ctx *ctx,
502 const void *src, size_t len);
503 /*
504 * packet_avail_size returns the available size in the current
505 * packet. Note that the size returned is only a hint, since it
506 * may change due to concurrent writes.
507 */
508 size_t (*packet_avail_size)(struct channel *chan,
509 struct lttng_ust_shm_handle *handle);
510 int (*is_finalized)(struct channel *chan);
511 int (*is_disabled)(struct channel *chan);
512 int (*flush_buffer)(struct channel *chan, struct lttng_ust_shm_handle *handle);
513 void (*event_strcpy)(struct lttng_ust_lib_ring_buffer_ctx *ctx,
514 const char *src, size_t len);
515 };
516
517 /*
518 * IMPORTANT: this structure is part of the ABI between the probe and
519 * UST. Fields need to be only added at the end, never reordered, never
520 * removed.
521 */
522 struct lttng_channel {
523 /*
524 * The pointers located in this private data are NOT safe to be
525 * dereferenced by the consumer. The only operations the
526 * consumer process is designed to be allowed to do is to read
527 * and perform subbuffer flush.
528 */
529 struct channel *chan; /* Channel buffers */
530 int enabled;
531 struct lttng_ctx *ctx;
532 /* Event ID management */
533 struct lttng_session *session;
534 int objd; /* Object associated to channel */
535 struct cds_list_head node; /* Channel list in session */
536 const struct lttng_channel_ops *ops;
537 int header_type; /* 0: unset, 1: compact, 2: large */
538 struct lttng_ust_shm_handle *handle; /* shared-memory handle */
539
540 /* Channel ID */
541 unsigned int id;
542 enum lttng_ust_chan_type type;
543 unsigned char uuid[LTTNG_UST_UUID_LEN]; /* Trace session unique ID */
544 int tstate:1; /* Transient enable state */
545 };
546
547 #define LTTNG_COUNTER_DIMENSION_MAX 8
548
549 struct lttng_counter_dimension {
550 uint64_t size;
551 uint64_t underflow_index;
552 uint64_t overflow_index;
553 uint8_t has_underflow;
554 uint8_t has_overflow;
555 };
556
557 struct lttng_counter_ops {
558 struct lib_counter *(*counter_create)(size_t nr_dimensions,
559 const struct lttng_counter_dimension *dimensions,
560 int64_t global_sum_step,
561 int global_counter_fd,
562 int nr_counter_cpu_fds,
563 const int *counter_cpu_fds,
564 bool is_daemon);
565 void (*counter_destroy)(struct lib_counter *counter);
566 int (*counter_add)(struct lib_counter *counter,
567 const size_t *dimension_indexes, int64_t v);
568 int (*counter_read)(struct lib_counter *counter,
569 const size_t *dimension_indexes, int cpu,
570 int64_t *value, bool *overflow, bool *underflow);
571 int (*counter_aggregate)(struct lib_counter *counter,
572 const size_t *dimension_indexes, int64_t *value,
573 bool *overflow, bool *underflow);
574 int (*counter_clear)(struct lib_counter *counter, const size_t *dimension_indexes);
575 };
576
577 #define LTTNG_UST_STACK_CTX_PADDING 32
578 struct lttng_stack_ctx {
579 struct lttng_event *event;
580 struct lttng_ctx *chan_ctx; /* RCU dereferenced. */
581 struct lttng_ctx *event_ctx; /* RCU dereferenced. */
582 char padding[LTTNG_UST_STACK_CTX_PADDING];
583 };
584
585 #define LTTNG_UST_EVENT_HT_BITS 12
586 #define LTTNG_UST_EVENT_HT_SIZE (1U << LTTNG_UST_EVENT_HT_BITS)
587
588 struct lttng_ust_event_ht {
589 struct cds_hlist_head table[LTTNG_UST_EVENT_HT_SIZE];
590 };
591
592 #define LTTNG_UST_EVENT_NOTIFIER_HT_BITS 12
593 #define LTTNG_UST_EVENT_NOTIFIER_HT_SIZE (1U << LTTNG_UST_EVENT_NOTIFIER_HT_BITS)
594 struct lttng_ust_event_notifier_ht {
595 struct cds_hlist_head table[LTTNG_UST_EVENT_NOTIFIER_HT_SIZE];
596 };
597
598 #define LTTNG_UST_ENUM_HT_BITS 12
599 #define LTTNG_UST_ENUM_HT_SIZE (1U << LTTNG_UST_ENUM_HT_BITS)
600
601 struct lttng_ust_enum_ht {
602 struct cds_hlist_head table[LTTNG_UST_ENUM_HT_SIZE];
603 };
604
605 /*
606 * IMPORTANT: this structure is part of the ABI between the probe and
607 * UST. Fields need to be only added at the end, never reordered, never
608 * removed.
609 */
610 struct lttng_session {
611 int active; /* Is trace session active ? */
612 int been_active; /* Been active ? */
613 int objd; /* Object associated */
614 struct cds_list_head chan_head; /* Channel list head */
615 struct cds_list_head events_head; /* list of events */
616 struct cds_list_head node; /* Session list */
617
618 /* New UST 2.1 */
619 /* List of enablers */
620 struct cds_list_head enablers_head;
621 struct lttng_ust_event_ht events_ht; /* ht of events */
622 void *owner; /* object owner */
623 int tstate:1; /* Transient enable state */
624
625 /* New UST 2.4 */
626 int statedump_pending:1;
627
628 /* New UST 2.8 */
629 struct lttng_ust_enum_ht enums_ht; /* ht of enumerations */
630 struct cds_list_head enums_head;
631 struct lttng_ctx *ctx; /* contexts for filters. */
632 };
633
634 struct lttng_counter {
635 int objd;
636 struct lttng_event_notifier_group *event_notifier_group; /* owner */
637 struct lttng_counter_transport *transport;
638 struct lib_counter *counter;
639 struct lttng_counter_ops *ops;
640 };
641
642 struct lttng_event_notifier_group {
643 int objd;
644 void *owner;
645 int notification_fd;
646 struct cds_list_head node; /* Event notifier group handle list */
647 struct cds_list_head enablers_head;
648 struct cds_list_head event_notifiers_head; /* list of event_notifiers */
649 struct lttng_ust_event_notifier_ht event_notifiers_ht; /* hashtable of event_notifiers */
650 struct lttng_ctx *ctx; /* contexts for filters. */
651
652 struct lttng_counter *error_counter;
653 size_t error_counter_len;
654 };
655
656 struct lttng_transport {
657 char *name;
658 struct cds_list_head node;
659 struct lttng_channel_ops ops;
660 const struct lttng_ust_lib_ring_buffer_config *client_config;
661 };
662
663 struct lttng_counter_transport {
664 char *name;
665 struct cds_list_head node;
666 struct lttng_counter_ops ops;
667 const struct lib_counter_config *client_config;
668 };
669
670 struct lttng_session *lttng_session_create(void);
671 int lttng_session_enable(struct lttng_session *session);
672 int lttng_session_disable(struct lttng_session *session);
673 int lttng_session_statedump(struct lttng_session *session);
674 void lttng_session_destroy(struct lttng_session *session);
675
676 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
677 const char *transport_name,
678 void *buf_addr,
679 size_t subbuf_size, size_t num_subbuf,
680 unsigned int switch_timer_interval,
681 unsigned int read_timer_interval,
682 int **shm_fd, int **wait_fd,
683 uint64_t **memory_map_size,
684 struct lttng_channel *chan_priv_init);
685
686 int lttng_channel_enable(struct lttng_channel *channel);
687 int lttng_channel_disable(struct lttng_channel *channel);
688
689 void lttng_transport_register(struct lttng_transport *transport);
690 void lttng_transport_unregister(struct lttng_transport *transport);
691
692 int lttng_probe_register(struct lttng_probe_desc *desc);
693 void lttng_probe_unregister(struct lttng_probe_desc *desc);
694 void lttng_probe_provider_unregister_events(struct lttng_probe_desc *desc);
695 int lttng_fix_pending_events(void);
696 int lttng_probes_init(void);
697 void lttng_probes_exit(void);
698
699 /*
700 * Can be used by applications that change their procname to clear the ust cached value.
701 */
702 void lttng_context_procname_reset(void);
703
704 struct lttng_transport *lttng_transport_find(const char *name);
705
706 int lttng_probes_get_event_list(struct lttng_ust_tracepoint_list *list);
707 void lttng_probes_prune_event_list(struct lttng_ust_tracepoint_list *list);
708 struct lttng_ust_tracepoint_iter *
709 lttng_ust_tracepoint_list_get_iter_next(struct lttng_ust_tracepoint_list *list);
710 int lttng_probes_get_field_list(struct lttng_ust_field_list *list);
711 void lttng_probes_prune_field_list(struct lttng_ust_field_list *list);
712 struct lttng_ust_field_iter *
713 lttng_ust_field_list_get_iter_next(struct lttng_ust_field_list *list);
714
715 void lttng_free_event_filter_runtime(struct lttng_event *event);
716
717 struct cds_list_head *lttng_get_probe_list_head(void);
718 int lttng_session_active(void);
719
720 typedef int (*t_statedump_func_ptr)(struct lttng_session *session);
721 void lttng_handle_pending_statedump(void *owner);
722 struct cds_list_head *_lttng_get_sessions(void);
723
724 struct lttng_enum *lttng_ust_enum_get_from_desc(struct lttng_session *session,
725 const struct lttng_enum_desc *enum_desc);
726
727 void lttng_ust_dl_update(void *ip);
728
729 #ifdef __cplusplus
730 }
731 #endif
732
733 #endif /* _LTTNG_UST_EVENTS_H */
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