include/lttng/ust-events.h

   1 #ifndef _LTTNG_UST_EVENTS_H
   2 #define _LTTNG_UST_EVENTS_H
   3
   4 /*
   5  * lttng/ust-events.h
   6  *
   7  * Copyright 2010-2012 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  *
   9  * Holds LTTng per-session event registry.
  10  *
  11  * Permission is hereby granted, free of charge, to any person obtaining a copy
  12  * of this software and associated documentation files (the "Software"), to deal
  13  * in the Software without restriction, including without limitation the rights
  14  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  15  * copies of the Software, and to permit persons to whom the Software is
  16  * furnished to do so, subject to the following conditions:
  17  *
  18  * The above copyright notice and this permission notice shall be included in
  19  * all copies or substantial portions of the Software.
  20  *
  21  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  22  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  23  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  24  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  25  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  26  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  27  * SOFTWARE.
  28  */
  29
  30 #include <urcu/list.h>
  31 #include <urcu/hlist.h>
  32 #include <stdint.h>
  33 #include <lttng/ust-config.h>
  34 #include <lttng/ust-abi.h>
  35 #include <lttng/ust-tracer.h>
  36 #include <lttng/ust-endian.h>
  37 #include <float.h>
  38 #include <errno.h>
  39 #include <urcu/ref.h>
  40 #include <pthread.h>
  41
  42 #ifdef __cplusplus
  43 extern "C" {
  44 #endif
  45
  46 #define LTTNG_UST_UUID_LEN              16
  47
  48 /*
  49  * Tracepoint provider version. Compatibility based on the major number.
  50  * Older tracepoint providers can always register to newer lttng-ust
  51  * library, but the opposite is rejected: a newer tracepoint provider is
  52  * rejected by an older lttng-ust library.
  53  */
  54 #define LTTNG_UST_PROVIDER_MAJOR        1
  55 #define LTTNG_UST_PROVIDER_MINOR        0
  56
  57 struct lttng_channel;
  58 struct lttng_session;
  59 struct lttng_ust_lib_ring_buffer_ctx;
  60 struct lttng_ust_context_app;
  61 struct lttng_event_field;
  62
  63 /*
  64  * Data structures used by tracepoint event declarations, and by the
  65  * tracer. Those structures have padding for future extension.
  66  */
  67
  68 /*
  69  * LTTng client type enumeration. Used by the consumer to map the
  70  * callbacks from its own address space.
  71  */
  72 enum lttng_client_types {
  73         LTTNG_CLIENT_METADATA = 0,
  74         LTTNG_CLIENT_DISCARD = 1,
  75         LTTNG_CLIENT_OVERWRITE = 2,
  76         LTTNG_CLIENT_DISCARD_RT = 3,
  77         LTTNG_CLIENT_OVERWRITE_RT = 4,
  78         LTTNG_NR_CLIENT_TYPES,
  79 };
  80
  81 /* Type description */
  82
  83 /* Update the astract_types name table in lttng-types.c along with this enum */
  84 enum lttng_abstract_types {
  85         atype_integer,
  86         atype_enum,
  87         atype_array,
  88         atype_sequence,
  89         atype_string,
  90         atype_float,
  91         atype_dynamic,
  92         atype_struct,
  93         NR_ABSTRACT_TYPES,
  94 };
  95
  96 /* Update the string_encodings name table in lttng-types.c along with this enum */
  97 enum lttng_string_encodings {
  98         lttng_encode_none = 0,
  99         lttng_encode_UTF8 = 1,
 100         lttng_encode_ASCII = 2,
 101         NR_STRING_ENCODINGS,
 102 };
 103
 104 #define LTTNG_UST_ENUM_ENTRY_PADDING    16
 105 struct lttng_enum_entry {
 106         unsigned long long start, end;  /* start and end are inclusive */
 107         const char *string;
 108         char padding[LTTNG_UST_ENUM_ENTRY_PADDING];
 109 };
 110
 111 #define __type_integer(_type, _byte_order, _base, _encoding)    \
 112         {                                                       \
 113           .atype = atype_integer,                               \
 114           .u =                                                  \
 115                 {                                               \
 116                   .basic =                                      \
 117                         {                                       \
 118                           .integer =                            \
 119                                 {                               \
 120                                   .size = sizeof(_type) * CHAR_BIT,             \
 121                                   .alignment = lttng_alignof(_type) * CHAR_BIT, \
 122                                   .signedness = lttng_is_signed_type(_type),    \
 123                                   .reverse_byte_order = _byte_order != BYTE_ORDER, \
 124                                   .base = _base,                                \
 125                                   .encoding = lttng_encode_##_encoding,         \
 126                                 }                               \
 127                         }                                       \
 128                 },                                              \
 129         }                                                       \
 130
 131 #define LTTNG_UST_INTEGER_TYPE_PADDING  24
 132 struct lttng_integer_type {
 133         unsigned int size;              /* in bits */
 134         unsigned short alignment;       /* in bits */
 135         unsigned int signedness:1;
 136         unsigned int reverse_byte_order:1;
 137         unsigned int base;              /* 2, 8, 10, 16, for pretty print */
 138         enum lttng_string_encodings encoding;
 139         char padding[LTTNG_UST_INTEGER_TYPE_PADDING];
 140 };
 141
 142 /*
 143  * Only float and double are supported. long double is not supported at
 144  * the moment.
 145  */
 146 #define _float_mant_dig(_type)                                          \
 147         (sizeof(_type) == sizeof(float) ? FLT_MANT_DIG                  \
 148                 : (sizeof(_type) == sizeof(double) ? DBL_MANT_DIG       \
 149                 : 0))
 150
 151 #define __type_float(_type)                                     \
 152         {                                                       \
 153           .atype = atype_float,                                 \
 154           .u =                                                  \
 155                 {                                               \
 156                   .basic =                                      \
 157                         {                                       \
 158                           ._float =                             \
 159                                 {                               \
 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         }                                                       \
 169
 170 #define LTTNG_UST_FLOAT_TYPE_PADDING    24
 171 struct lttng_float_type {
 172         unsigned int exp_dig;           /* exponent digits, in bits */
 173         unsigned int mant_dig;          /* mantissa digits, in bits */
 174         unsigned short alignment;       /* in bits */
 175         unsigned int reverse_byte_order:1;
 176         char padding[LTTNG_UST_FLOAT_TYPE_PADDING];
 177 };
 178
 179 #define LTTNG_UST_BASIC_TYPE_PADDING    128
 180 union _lttng_basic_type {
 181         struct lttng_integer_type integer;
 182         struct {
 183                 const struct lttng_enum_desc *desc;     /* Enumeration mapping */
 184                 struct lttng_integer_type container_type;
 185         } enumeration;
 186         struct {
 187                 enum lttng_string_encodings encoding;
 188         } string;
 189         struct lttng_float_type _float;
 190         char padding[LTTNG_UST_BASIC_TYPE_PADDING];
 191 };
 192
 193 struct lttng_basic_type {
 194         enum lttng_abstract_types atype;
 195         union {
 196                 union _lttng_basic_type basic;
 197         } u;
 198 };
 199
 200 #define LTTNG_UST_TYPE_PADDING  128
 201 struct lttng_type {
 202         enum lttng_abstract_types atype;
 203         union {
 204                 union _lttng_basic_type basic;
 205                 struct {
 206                         struct lttng_basic_type elem_type;
 207                         unsigned int length;            /* num. elems. */
 208                 } array;
 209                 struct {
 210                         struct lttng_basic_type length_type;
 211                         struct lttng_basic_type elem_type;
 212                 } sequence;
 213                 struct {
 214                         uint32_t nr_fields;
 215                         struct lttng_event_field *fields;       /* Array of fields. */
 216                 } _struct;
 217                 char padding[LTTNG_UST_TYPE_PADDING];
 218         } u;
 219 };
 220
 221 #define LTTNG_UST_ENUM_TYPE_PADDING     24
 222 struct lttng_enum_desc {
 223         const char *name;
 224         const struct lttng_enum_entry *entries;
 225         unsigned int nr_entries;
 226         char padding[LTTNG_UST_ENUM_TYPE_PADDING];
 227 };
 228
 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.
 235  */
 236
 237 #define LTTNG_UST_EVENT_FIELD_PADDING   28
 238 struct lttng_event_field {
 239         const char *name;
 240         struct lttng_type type;
 241         unsigned int nowrite;   /* do not write into trace */
 242         char padding[LTTNG_UST_EVENT_FIELD_PADDING];
 243 };
 244
 245 enum lttng_ust_dynamic_type {
 246         LTTNG_UST_DYNAMIC_TYPE_NONE,
 247         LTTNG_UST_DYNAMIC_TYPE_S8,
 248         LTTNG_UST_DYNAMIC_TYPE_S16,
 249         LTTNG_UST_DYNAMIC_TYPE_S32,
 250         LTTNG_UST_DYNAMIC_TYPE_S64,
 251         LTTNG_UST_DYNAMIC_TYPE_U8,
 252         LTTNG_UST_DYNAMIC_TYPE_U16,
 253         LTTNG_UST_DYNAMIC_TYPE_U32,
 254         LTTNG_UST_DYNAMIC_TYPE_U64,
 255         LTTNG_UST_DYNAMIC_TYPE_FLOAT,
 256         LTTNG_UST_DYNAMIC_TYPE_DOUBLE,
 257         LTTNG_UST_DYNAMIC_TYPE_STRING,
 258         _NR_LTTNG_UST_DYNAMIC_TYPES,
 259 };
 260
 261 struct lttng_ctx_value {
 262         enum lttng_ust_dynamic_type sel;
 263         union {
 264                 int64_t s64;
 265                 const char *str;
 266                 double d;
 267         } u;
 268 };
 269
 270 struct lttng_perf_counter_field;
 271
 272 #define LTTNG_UST_CTX_FIELD_PADDING     40
 273 struct lttng_ctx_field {
 274         struct lttng_event_field event_field;
 275         size_t (*get_size)(struct lttng_ctx_field *field, size_t offset);
 276         void (*record)(struct lttng_ctx_field *field,
 277                        struct lttng_ust_lib_ring_buffer_ctx *ctx,
 278                        struct lttng_channel *chan);
 279         void (*get_value)(struct lttng_ctx_field *field,
 280                          struct lttng_ctx_value *value);
 281         union {
 282                 struct lttng_perf_counter_field *perf_counter;
 283                 char padding[LTTNG_UST_CTX_FIELD_PADDING];
 284         } u;
 285         void (*destroy)(struct lttng_ctx_field *field);
 286         char *field_name;       /* Has ownership, dynamically allocated. */
 287 };
 288
 289 #define LTTNG_UST_CTX_PADDING   20
 290 struct lttng_ctx {
 291         struct lttng_ctx_field *fields;
 292         unsigned int nr_fields;
 293         unsigned int allocated_fields;
 294         unsigned int largest_align;
 295         char padding[LTTNG_UST_CTX_PADDING];
 296 };
 297
 298 #define LTTNG_UST_EVENT_DESC_PADDING    40
 299 struct lttng_event_desc {
 300         const char *name;
 301         void (*probe_callback)(void);
 302         const struct lttng_event_ctx *ctx;      /* context */
 303         const struct lttng_event_field *fields; /* event payload */
 304         unsigned int nr_fields;
 305         const int **loglevel;
 306         const char *signature;  /* Argument types/names received */
 307         union {
 308                 struct {
 309                         const char **model_emf_uri;
 310                 } ext;
 311                 char padding[LTTNG_UST_EVENT_DESC_PADDING];
 312         } u;
 313 };
 314
 315 #define LTTNG_UST_PROBE_DESC_PADDING    12
 316 struct lttng_probe_desc {
 317         const char *provider;
 318         const struct lttng_event_desc **event_desc;
 319         unsigned int nr_events;
 320         struct cds_list_head head;              /* chain registered probes */
 321         struct cds_list_head lazy_init_head;
 322         int lazy;                               /* lazy registration */
 323         uint32_t major;
 324         uint32_t minor;
 325         char padding[LTTNG_UST_PROBE_DESC_PADDING];
 326 };
 327
 328 /* Data structures used by the tracer. */
 329
 330 enum lttng_enabler_type {
 331         LTTNG_ENABLER_WILDCARD,
 332         LTTNG_ENABLER_EVENT,
 333 };
 334
 335 /*
 336  * Enabler field, within whatever object is enabling an event. Target of
 337  * backward reference.
 338  */
 339 struct lttng_enabler {
 340         enum lttng_enabler_type type;
 341
 342         /* head list of struct lttng_ust_filter_bytecode_node */
 343         struct cds_list_head filter_bytecode_head;
 344         /* head list of struct lttng_ust_excluder_node */
 345         struct cds_list_head excluder_head;
 346         struct cds_list_head node;      /* per-session list of enablers */
 347
 348         struct lttng_ust_event event_param;
 349         struct lttng_channel *chan;
 350         struct lttng_ctx *ctx;
 351         unsigned int enabled:1;
 352 };
 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 struct lttng_ust_filter_bytecode_node {
 378         struct cds_list_head node;
 379         struct lttng_enabler *enabler;
 380         /*
 381          * struct lttng_ust_filter_bytecode has var. sized array, must
 382          * be last field.
 383          */
 384         struct lttng_ust_filter_bytecode bc;
 385 };
 386
 387 struct lttng_ust_excluder_node {
 388         struct cds_list_head node;
 389         struct lttng_enabler *enabler;
 390         /*
 391          * struct lttng_ust_event_exclusion had variable sized array,
 392          * must be last field.
 393          */
 394         struct lttng_ust_event_exclusion excluder;
 395 };
 396 /*
 397  * Filter return value masks.
 398  */
 399 enum lttng_filter_ret {
 400         LTTNG_FILTER_DISCARD = 0,
 401         LTTNG_FILTER_RECORD_FLAG = (1ULL << 0),
 402         /* Other bits are kept for future use. */
 403 };
 404
 405 struct lttng_bytecode_runtime {
 406         /* Associated bytecode */
 407         struct lttng_ust_filter_bytecode_node *bc;
 408         uint64_t (*filter)(void *filter_data, const char *filter_stack_data);
 409         int link_failed;
 410         struct cds_list_head node;      /* list of bytecode runtime in event */
 411         struct lttng_session *session;
 412 };
 413
 414 /*
 415  * Objects in a linked-list of enablers, owned by an event.
 416  */
 417 struct lttng_enabler_ref {
 418         struct cds_list_head node;              /* enabler ref list */
 419         struct lttng_enabler *ref;              /* backward ref */
 420 };
 421
 422 /*
 423  * lttng_event structure is referred to by the tracing fast path. It
 424  * must be kept small.
 425  *
 426  * IMPORTANT: this structure is part of the ABI between the probe and
 427  * UST. Fields need to be only added at the end, never reordered, never
 428  * removed.
 429  */
 430 struct lttng_event {
 431         /* LTTng-UST 2.0 starts here */
 432         unsigned int id;
 433         struct lttng_channel *chan;
 434         int enabled;
 435         const struct lttng_event_desc *desc;
 436         void *_deprecated1;
 437         struct lttng_ctx *ctx;
 438         enum lttng_ust_instrumentation instrumentation;
 439         struct cds_list_head node;              /* Event list in session */
 440         struct cds_list_head _deprecated2;
 441         void *_deprecated3;
 442         unsigned int _deprecated4:1;
 443
 444         /* LTTng-UST 2.1 starts here */
 445         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 446         struct cds_list_head 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_enum {
 455         const struct lttng_enum_desc *desc;
 456         struct lttng_session *session;
 457         struct cds_list_head node;      /* Enum list in session */
 458         struct cds_hlist_node hlist;    /* Session ht of enums */
 459         uint64_t id;                    /* Enumeration ID in sessiond */
 460 };
 461
 462 struct channel;
 463 struct lttng_ust_shm_handle;
 464
 465 /*
 466  * IMPORTANT: this structure is part of the ABI between the probe and
 467  * UST. Fields need to be only added at the end, never reordered, never
 468  * removed.
 469  */
 470 struct lttng_channel_ops {
 471         struct lttng_channel *(*channel_create)(const char *name,
 472                         void *buf_addr,
 473                         size_t subbuf_size, size_t num_subbuf,
 474                         unsigned int switch_timer_interval,
 475                         unsigned int read_timer_interval,
 476                         unsigned char *uuid,
 477                         uint32_t chan_id,
 478                         const int *stream_fds, int nr_stream_fds);
 479         void (*channel_destroy)(struct lttng_channel *chan);
 480         union {
 481                 void *_deprecated1;
 482                 unsigned long has_strcpy:1;             /* ABI has strcpy */
 483         } u;
 484         void *_deprecated2;
 485         int (*event_reserve)(struct lttng_ust_lib_ring_buffer_ctx *ctx,
 486                              uint32_t event_id);
 487         void (*event_commit)(struct lttng_ust_lib_ring_buffer_ctx *ctx);
 488         void (*event_write)(struct lttng_ust_lib_ring_buffer_ctx *ctx,
 489                         const void *src, size_t len);
 490         /*
 491          * packet_avail_size returns the available size in the current
 492          * packet. Note that the size returned is only a hint, since it
 493          * may change due to concurrent writes.
 494          */
 495         size_t (*packet_avail_size)(struct channel *chan,
 496                                     struct lttng_ust_shm_handle *handle);
 497         //wait_queue_head_t *(*get_reader_wait_queue)(struct channel *chan);
 498         //wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 499         int (*is_finalized)(struct channel *chan);
 500         int (*is_disabled)(struct channel *chan);
 501         int (*flush_buffer)(struct channel *chan, struct lttng_ust_shm_handle *handle);
 502         void (*event_strcpy)(struct lttng_ust_lib_ring_buffer_ctx *ctx,
 503                         const char *src, size_t len);
 504 };
 505
 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 struct lttng_channel {
 512         /*
 513          * The pointers located in this private data are NOT safe to be
 514          * dereferenced by the consumer. The only operations the
 515          * consumer process is designed to be allowed to do is to read
 516          * and perform subbuffer flush.
 517          */
 518         struct channel *chan;           /* Channel buffers */
 519         int enabled;
 520         struct lttng_ctx *ctx;
 521         /* Event ID management */
 522         struct lttng_session *session;
 523         int objd;                       /* Object associated to channel */
 524         unsigned int _deprecated1;
 525         unsigned int _deprecated2;
 526         struct cds_list_head node;      /* Channel list in session */
 527         const struct lttng_channel_ops *ops;
 528         int header_type;                /* 0: unset, 1: compact, 2: large */
 529         struct lttng_ust_shm_handle *handle;    /* shared-memory handle */
 530         unsigned int _deprecated3:1;
 531
 532         /* Channel ID */
 533         unsigned int id;
 534         enum lttng_ust_chan_type type;
 535         unsigned char uuid[LTTNG_UST_UUID_LEN]; /* Trace session unique ID */
 536         int tstate:1;                   /* Transient enable state */
 537 };
 538
 539 #define LTTNG_UST_STACK_CTX_PADDING     32
 540 struct lttng_stack_ctx {
 541         struct lttng_event *event;
 542         struct lttng_ctx *chan_ctx;     /* RCU dereferenced. */
 543         struct lttng_ctx *event_ctx;    /* RCU dereferenced. */
 544         char padding[LTTNG_UST_STACK_CTX_PADDING];
 545 };
 546
 547 #define LTTNG_UST_EVENT_HT_BITS         12
 548 #define LTTNG_UST_EVENT_HT_SIZE         (1U << LTTNG_UST_EVENT_HT_BITS)
 549
 550 struct lttng_ust_event_ht {
 551         struct cds_hlist_head table[LTTNG_UST_EVENT_HT_SIZE];
 552 };
 553
 554 #define LTTNG_UST_ENUM_HT_BITS          12
 555 #define LTTNG_UST_ENUM_HT_SIZE          (1U << LTTNG_UST_ENUM_HT_BITS)
 556
 557 struct lttng_ust_enum_ht {
 558         struct cds_hlist_head table[LTTNG_UST_ENUM_HT_SIZE];
 559 };
 560
 561 /*
 562  * IMPORTANT: this structure is part of the ABI between the probe and
 563  * UST. Fields need to be only added at the end, never reordered, never
 564  * removed.
 565  */
 566 struct lttng_session {
 567         int active;                             /* Is trace session active ? */
 568         int been_active;                        /* Been active ? */
 569         int objd;                               /* Object associated */
 570         void *_deprecated1;
 571         struct cds_list_head chan_head;         /* Channel list head */
 572         struct cds_list_head events_head;       /* list of events */
 573         struct cds_list_head _deprecated2;
 574         struct cds_list_head node;              /* Session list */
 575         int _deprecated3;
 576         unsigned int _deprecated4:1;
 577
 578         /* New UST 2.1 */
 579         /* List of enablers */
 580         struct cds_list_head enablers_head;
 581         struct lttng_ust_event_ht events_ht;    /* ht of events */
 582         void *owner;                            /* object owner */
 583         int tstate:1;                           /* Transient enable state */
 584
 585         /* New UST 2.4 */
 586         int statedump_pending:1;
 587
 588         /* New UST 2.8 */
 589         struct lttng_ust_enum_ht enums_ht;      /* ht of enumerations */
 590         struct cds_list_head enums_head;
 591         struct lttng_ctx *ctx;                  /* contexts for filters. */
 592 };
 593
 594 struct lttng_transport {
 595         char *name;
 596         struct cds_list_head node;
 597         struct lttng_channel_ops ops;
 598         const struct lttng_ust_lib_ring_buffer_config *client_config;
 599 };
 600
 601 struct lttng_session *lttng_session_create(void);
 602 int lttng_session_enable(struct lttng_session *session);
 603 int lttng_session_disable(struct lttng_session *session);
 604 void lttng_session_destroy(struct lttng_session *session);
 605
 606 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 607                                        const char *transport_name,
 608                                        void *buf_addr,
 609                                        size_t subbuf_size, size_t num_subbuf,
 610                                        unsigned int switch_timer_interval,
 611                                        unsigned int read_timer_interval,
 612                                        int **shm_fd, int **wait_fd,
 613                                        uint64_t **memory_map_size,
 614                                        struct lttng_channel *chan_priv_init);
 615
 616 int lttng_channel_enable(struct lttng_channel *channel);
 617 int lttng_channel_disable(struct lttng_channel *channel);
 618
 619 struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
 620                 struct lttng_ust_event *event_param,
 621                 struct lttng_channel *chan);
 622 int lttng_enabler_enable(struct lttng_enabler *enabler);
 623 int lttng_enabler_disable(struct lttng_enabler *enabler);
 624 int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
 625                 struct lttng_ust_filter_bytecode_node *bytecode);
 626 int lttng_enabler_attach_context(struct lttng_enabler *enabler,
 627                 struct lttng_ust_context *ctx);
 628 int lttng_enabler_attach_exclusion(struct lttng_enabler *enabler,
 629                 struct lttng_ust_excluder_node *excluder);
 630
 631 int lttng_attach_context(struct lttng_ust_context *context_param,
 632                 union ust_args *uargs,
 633                 struct lttng_ctx **ctx, struct lttng_session *session);
 634 int lttng_session_context_init(struct lttng_ctx **ctx);
 635
 636 void lttng_transport_register(struct lttng_transport *transport);
 637 void lttng_transport_unregister(struct lttng_transport *transport);
 638
 639 void synchronize_trace(void);
 640
 641 int lttng_probe_register(struct lttng_probe_desc *desc);
 642 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 643 int lttng_fix_pending_events(void);
 644 int lttng_probes_init(void);
 645 void lttng_probes_exit(void);
 646 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 647 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 648 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx_p);
 649 void lttng_context_update(struct lttng_ctx *ctx);
 650 void lttng_remove_context_field(struct lttng_ctx **ctx_p,
 651                                 struct lttng_ctx_field *field);
 652 void lttng_destroy_context(struct lttng_ctx *ctx);
 653 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 654 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 655 int lttng_add_pthread_id_to_ctx(struct lttng_ctx **ctx);
 656 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 657 int lttng_add_ip_to_ctx(struct lttng_ctx **ctx);
 658 int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
 659 int lttng_add_dyntest_to_ctx(struct lttng_ctx **ctx);
 660 void lttng_context_vtid_reset(void);
 661 void lttng_context_vpid_reset(void);
 662
 663 #ifdef LTTNG_UST_HAVE_PERF_EVENT
 664 int lttng_add_perf_counter_to_ctx(uint32_t type,
 665                                   uint64_t config,
 666                                   const char *name,
 667                                   struct lttng_ctx **ctx);
 668 int lttng_perf_counter_init(void);
 669 void lttng_perf_counter_exit(void);
 670 #else /* #ifdef LTTNG_UST_HAVE_PERF_EVENT */
 671 static inline
 672 int lttng_add_perf_counter_to_ctx(uint32_t type,
 673                                   uint64_t config,
 674                                   const char *name,
 675                                   struct lttng_ctx **ctx)
 676 {
 677         return -ENOSYS;
 678 }
 679 static inline
 680 int lttng_perf_counter_init(void)
 681 {
 682         return 0;
 683 }
 684 static inline
 685 void lttng_perf_counter_exit(void)
 686 {
 687 }
 688 #endif /* #else #ifdef LTTNG_UST_HAVE_PERF_EVENT */
 689
 690 extern const struct lttng_ust_client_lib_ring_buffer_client_cb *lttng_client_callbacks_metadata;
 691 extern const struct lttng_ust_client_lib_ring_buffer_client_cb *lttng_client_callbacks_discard;
 692 extern const struct lttng_ust_client_lib_ring_buffer_client_cb *lttng_client_callbacks_overwrite;
 693
 694 struct lttng_transport *lttng_transport_find(const char *name);
 695
 696 int lttng_probes_get_event_list(struct lttng_ust_tracepoint_list *list);
 697 void lttng_probes_prune_event_list(struct lttng_ust_tracepoint_list *list);
 698 struct lttng_ust_tracepoint_iter *
 699         lttng_ust_tracepoint_list_get_iter_next(struct lttng_ust_tracepoint_list *list);
 700 int lttng_probes_get_field_list(struct lttng_ust_field_list *list);
 701 void lttng_probes_prune_field_list(struct lttng_ust_field_list *list);
 702 struct lttng_ust_field_iter *
 703         lttng_ust_field_list_get_iter_next(struct lttng_ust_field_list *list);
 704
 705 void lttng_filter_event_link_bytecode(struct lttng_event *event);
 706 void lttng_enabler_event_link_bytecode(struct lttng_event *event,
 707                 struct lttng_enabler *enabler);
 708 void lttng_free_event_filter_runtime(struct lttng_event *event);
 709 void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);
 710
 711 struct cds_list_head *lttng_get_probe_list_head(void);
 712 int lttng_session_active(void);
 713
 714 typedef int (*t_statedump_func_ptr)(struct lttng_session *session);
 715 void lttng_handle_pending_statedump(void *owner);
 716 struct cds_list_head *_lttng_get_sessions(void);
 717 struct lttng_enum *lttng_ust_enum_get(struct lttng_session *session,
 718                 const char *enum_name);
 719
 720 #ifdef __cplusplus
 721 }
 722 #endif
 723
 724 #endif /* _LTTNG_UST_EVENTS_H */