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