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-abi.h>
  34 #include <lttng/ust-tracer.h>
  35 #include <lttng/ust-endian.h>
  36 #include <float.h>
  37
  38 #ifdef __cplusplus
  39 extern "C" {
  40 #endif
  41
  42 #define LTTNG_UST_UUID_LEN              16
  43
  44 /*
  45  * Tracepoint provider version. Compatibility based on the major number.
  46  * Older tracepoint providers can always register to newer lttng-ust
  47  * library, but the opposite is rejected: a newer tracepoint provider is
  48  * rejected by an older lttng-ust library.
  49  */
  50 #define LTTNG_UST_PROVIDER_MAJOR        1
  51 #define LTTNG_UST_PROVIDER_MINOR        0
  52
  53 struct lttng_channel;
  54 struct lttng_session;
  55 struct lttng_ust_lib_ring_buffer_ctx;
  56
  57 /*
  58  * Data structures used by tracepoint event declarations, and by the
  59  * tracer. Those structures have padding for future extension.
  60  */
  61
  62 /*
  63  * LTTng client type enumeration. Used by the consumer to map the
  64  * callbacks from its own address space.
  65  */
  66 enum lttng_client_types {
  67         LTTNG_CLIENT_METADATA = 0,
  68         LTTNG_CLIENT_DISCARD = 1,
  69         LTTNG_CLIENT_OVERWRITE = 2,
  70         LTTNG_CLIENT_DISCARD_RT = 3,
  71         LTTNG_CLIENT_OVERWRITE_RT = 4,
  72         LTTNG_NR_CLIENT_TYPES,
  73 };
  74
  75 /* Type description */
  76
  77 /* Update the astract_types name table in lttng-types.c along with this enum */
  78 enum lttng_abstract_types {
  79         atype_integer,
  80         atype_enum,
  81         atype_array,
  82         atype_sequence,
  83         atype_string,
  84         atype_float,
  85         NR_ABSTRACT_TYPES,
  86 };
  87
  88 /* Update the string_encodings name table in lttng-types.c along with this enum */
  89 enum lttng_string_encodings {
  90         lttng_encode_none = 0,
  91         lttng_encode_UTF8 = 1,
  92         lttng_encode_ASCII = 2,
  93         NR_STRING_ENCODINGS,
  94 };
  95
  96 #define LTTNG_UST_ENUM_ENTRY_PADDING    16
  97 struct lttng_enum_entry {
  98         unsigned long long start, end;  /* start and end are inclusive */
  99         const char *string;
 100         char padding[LTTNG_UST_ENUM_ENTRY_PADDING];
 101 };
 102
 103 #define __type_integer(_type, _byte_order, _base, _encoding)    \
 104         {                                                       \
 105           .atype = atype_integer,                               \
 106           .u =                                                  \
 107                 {                                               \
 108                   .basic =                                      \
 109                         {                                       \
 110                           .integer =                            \
 111                                 {                               \
 112                                   .size = sizeof(_type) * CHAR_BIT,             \
 113                                   .alignment = lttng_alignof(_type) * CHAR_BIT, \
 114                                   .signedness = lttng_is_signed_type(_type),    \
 115                                   .reverse_byte_order = _byte_order != BYTE_ORDER, \
 116                                   .base = _base,                                \
 117                                   .encoding = lttng_encode_##_encoding,         \
 118                                 }                               \
 119                         }                                       \
 120                 },                                              \
 121         }                                                       \
 122
 123 #define LTTNG_UST_INTEGER_TYPE_PADDING  24
 124 struct lttng_integer_type {
 125         unsigned int size;              /* in bits */
 126         unsigned short alignment;       /* in bits */
 127         unsigned int signedness:1;
 128         unsigned int reverse_byte_order:1;
 129         unsigned int base;              /* 2, 8, 10, 16, for pretty print */
 130         enum lttng_string_encodings encoding;
 131         char padding[LTTNG_UST_INTEGER_TYPE_PADDING];
 132 };
 133
 134 /*
 135  * Only float and double are supported. long double is not supported at
 136  * the moment.
 137  */
 138 #define _float_mant_dig(_type)                                          \
 139         (sizeof(_type) == sizeof(float) ? FLT_MANT_DIG                  \
 140                 : (sizeof(_type) == sizeof(double) ? DBL_MANT_DIG       \
 141                 : 0))
 142
 143 #define __type_float(_type)                                     \
 144         {                                                       \
 145           .atype = atype_float,                                 \
 146           .u =                                                  \
 147                 {                                               \
 148                   .basic =                                      \
 149                         {                                       \
 150                           ._float =                             \
 151                                 {                               \
 152                                   .exp_dig = sizeof(_type) * CHAR_BIT           \
 153                                                   - _float_mant_dig(_type),     \
 154                                   .mant_dig = _float_mant_dig(_type),           \
 155                                   .alignment = lttng_alignof(_type) * CHAR_BIT, \
 156                                   .reverse_byte_order = BYTE_ORDER != FLOAT_WORD_ORDER, \
 157                                 }                               \
 158                         }                                       \
 159                 },                                              \
 160         }                                                       \
 161
 162 #define LTTNG_UST_FLOAT_TYPE_PADDING    24
 163 struct lttng_float_type {
 164         unsigned int exp_dig;           /* exponent digits, in bits */
 165         unsigned int mant_dig;          /* mantissa digits, in bits */
 166         unsigned short alignment;       /* in bits */
 167         unsigned int reverse_byte_order:1;
 168         char padding[LTTNG_UST_FLOAT_TYPE_PADDING];
 169 };
 170
 171 #define LTTNG_UST_BASIC_TYPE_PADDING    128
 172 union _lttng_basic_type {
 173         struct lttng_integer_type integer;
 174         struct {
 175                 const char *name;
 176         } enumeration;
 177         struct {
 178                 enum lttng_string_encodings encoding;
 179         } string;
 180         struct lttng_float_type _float;
 181         char padding[LTTNG_UST_BASIC_TYPE_PADDING];
 182 };
 183
 184 struct lttng_basic_type {
 185         enum lttng_abstract_types atype;
 186         union {
 187                 union _lttng_basic_type basic;
 188         } u;
 189 };
 190
 191 #define LTTNG_UST_TYPE_PADDING  128
 192 struct lttng_type {
 193         enum lttng_abstract_types atype;
 194         union {
 195                 union _lttng_basic_type basic;
 196                 struct {
 197                         struct lttng_basic_type elem_type;
 198                         unsigned int length;            /* num. elems. */
 199                 } array;
 200                 struct {
 201                         struct lttng_basic_type length_type;
 202                         struct lttng_basic_type elem_type;
 203                 } sequence;
 204                 char padding[LTTNG_UST_TYPE_PADDING];
 205         } u;
 206 };
 207
 208 #define LTTNG_UST_ENUM_TYPE_PADDING     24
 209 struct lttng_enum {
 210         const char *name;
 211         struct lttng_type container_type;
 212         const struct lttng_enum_entry *entries;
 213         unsigned int len;
 214         char padding[LTTNG_UST_ENUM_TYPE_PADDING];
 215 };
 216
 217 /*
 218  * Event field description
 219  *
 220  * IMPORTANT: this structure is part of the ABI between the probe and
 221  * UST. Fields need to be only added at the end, never reordered, never
 222  * removed.
 223  */
 224
 225 #define LTTNG_UST_EVENT_FIELD_PADDING   28
 226 struct lttng_event_field {
 227         const char *name;
 228         struct lttng_type type;
 229         unsigned int nowrite;   /* do not write into trace */
 230         char padding[LTTNG_UST_EVENT_FIELD_PADDING];
 231 };
 232
 233 union lttng_ctx_value {
 234         int64_t s64;
 235         const char *str;
 236         double d;
 237 };
 238
 239 #define LTTNG_UST_CTX_FIELD_PADDING     40
 240 struct lttng_ctx_field {
 241         struct lttng_event_field event_field;
 242         size_t (*get_size)(size_t offset);
 243         void (*record)(struct lttng_ctx_field *field,
 244                        struct lttng_ust_lib_ring_buffer_ctx *ctx,
 245                        struct lttng_channel *chan);
 246         void (*get_value)(struct lttng_ctx_field *field,
 247                          union lttng_ctx_value *value);
 248         union {
 249                 char padding[LTTNG_UST_CTX_FIELD_PADDING];
 250         } u;
 251         void (*destroy)(struct lttng_ctx_field *field);
 252 };
 253
 254 #define LTTNG_UST_CTX_PADDING   24
 255 struct lttng_ctx {
 256         struct lttng_ctx_field *fields;
 257         unsigned int nr_fields;
 258         unsigned int allocated_fields;
 259         char padding[LTTNG_UST_CTX_PADDING];
 260 };
 261
 262 #define LTTNG_UST_EVENT_DESC_PADDING    40
 263 struct lttng_event_desc {
 264         const char *name;
 265         void (*probe_callback)(void);
 266         const struct lttng_event_ctx *ctx;      /* context */
 267         const struct lttng_event_field *fields; /* event payload */
 268         unsigned int nr_fields;
 269         const int **loglevel;
 270         const char *signature;  /* Argument types/names received */
 271         union {
 272                 struct {
 273                         const char **model_emf_uri;
 274                 } ext;
 275                 char padding[LTTNG_UST_EVENT_DESC_PADDING];
 276         } u;
 277 };
 278
 279 #define LTTNG_UST_PROBE_DESC_PADDING    12
 280 struct lttng_probe_desc {
 281         const char *provider;
 282         const struct lttng_event_desc **event_desc;
 283         unsigned int nr_events;
 284         struct cds_list_head head;              /* chain registered probes */
 285         struct cds_list_head lazy_init_head;
 286         int lazy;                               /* lazy registration */
 287         uint32_t major;
 288         uint32_t minor;
 289         char padding[LTTNG_UST_PROBE_DESC_PADDING];
 290 };
 291
 292 /* Data structures used by the tracer. */
 293
 294 enum lttng_enabler_type {
 295         LTTNG_ENABLER_WILDCARD,
 296         LTTNG_ENABLER_EVENT,
 297 };
 298
 299 /*
 300  * Enabler field, within whatever object is enabling an event. Target of
 301  * backward reference.
 302  */
 303 struct lttng_enabler {
 304         enum lttng_enabler_type type;
 305
 306         /* head list of struct lttng_ust_filter_bytecode_node */
 307         struct cds_list_head filter_bytecode_head;
 308         /* head list of struct lttng_ust_excluder_node */
 309         struct cds_list_head excluder_head;
 310         struct cds_list_head node;      /* per-session list of enablers */
 311
 312         struct lttng_ust_event event_param;
 313         struct lttng_channel *chan;
 314         struct lttng_ctx *ctx;
 315         unsigned int enabled:1;
 316 };
 317
 318 struct tp_list_entry {
 319         struct lttng_ust_tracepoint_iter tp;
 320         struct cds_list_head head;
 321 };
 322
 323 struct lttng_ust_tracepoint_list {
 324         struct tp_list_entry *iter;
 325         struct cds_list_head head;
 326 };
 327
 328 struct tp_field_list_entry {
 329         struct lttng_ust_field_iter field;
 330         struct cds_list_head head;
 331 };
 332
 333 struct lttng_ust_field_list {
 334         struct tp_field_list_entry *iter;
 335         struct cds_list_head head;
 336 };
 337
 338 struct ust_pending_probe;
 339 struct lttng_event;
 340
 341 struct lttng_ust_filter_bytecode_node {
 342         struct cds_list_head node;
 343         struct lttng_enabler *enabler;
 344         /*
 345          * struct lttng_ust_filter_bytecode has var. sized array, must
 346          * be last field.
 347          */
 348         struct lttng_ust_filter_bytecode bc;
 349 };
 350
 351 struct lttng_ust_excluder_node {
 352         struct cds_list_head node;
 353         struct lttng_enabler *enabler;
 354         /*
 355          * struct lttng_ust_event_exclusion had variable sized array,
 356          * must be last field.
 357          */
 358         struct lttng_ust_event_exclusion excluder;
 359 };
 360 /*
 361  * Filter return value masks.
 362  */
 363 enum lttng_filter_ret {
 364         LTTNG_FILTER_DISCARD = 0,
 365         LTTNG_FILTER_RECORD_FLAG = (1ULL << 0),
 366         /* Other bits are kept for future use. */
 367 };
 368
 369 struct lttng_bytecode_runtime {
 370         /* Associated bytecode */
 371         struct lttng_ust_filter_bytecode_node *bc;
 372         uint64_t (*filter)(void *filter_data, const char *filter_stack_data);
 373         int link_failed;
 374         struct cds_list_head node;      /* list of bytecode runtime in event */
 375 };
 376
 377 /*
 378  * Objects in a linked-list of enablers, owned by an event.
 379  */
 380 struct lttng_enabler_ref {
 381         struct cds_list_head node;              /* enabler ref list */
 382         struct lttng_enabler *ref;              /* backward ref */
 383 };
 384
 385 /*
 386  * lttng_event structure is referred to by the tracing fast path. It
 387  * must be kept small.
 388  *
 389  * IMPORTANT: this structure is part of the ABI between the probe and
 390  * UST. Fields need to be only added at the end, never reordered, never
 391  * removed.
 392  */
 393 struct lttng_event {
 394         /* LTTng-UST 2.0 starts here */
 395         unsigned int id;
 396         struct lttng_channel *chan;
 397         int enabled;
 398         const struct lttng_event_desc *desc;
 399         void *_deprecated1;
 400         struct lttng_ctx *ctx;
 401         enum lttng_ust_instrumentation instrumentation;
 402         union {
 403         } u;
 404         struct cds_list_head node;              /* Event list in session */
 405         struct cds_list_head _deprecated2;
 406         void *_deprecated3;
 407         unsigned int _deprecated4:1;
 408
 409         /* LTTng-UST 2.1 starts here */
 410         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 411         struct cds_list_head bytecode_runtime_head;
 412         int has_enablers_without_bytecode;
 413         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 414         struct cds_list_head enablers_ref_head;
 415         struct cds_hlist_node hlist;    /* session ht of events */
 416         int registered;                 /* has reg'd tracepoint probe */
 417 };
 418
 419 struct channel;
 420 struct lttng_ust_shm_handle;
 421
 422 /*
 423  * IMPORTANT: this structure is part of the ABI between the probe and
 424  * UST. Fields need to be only added at the end, never reordered, never
 425  * removed.
 426  */
 427 struct lttng_channel_ops {
 428         struct lttng_channel *(*channel_create)(const char *name,
 429                         void *buf_addr,
 430                         size_t subbuf_size, size_t num_subbuf,
 431                         unsigned int switch_timer_interval,
 432                         unsigned int read_timer_interval,
 433                         unsigned char *uuid,
 434                         uint32_t chan_id);
 435         void (*channel_destroy)(struct lttng_channel *chan);
 436         void *_deprecated1;
 437         void *_deprecated2;
 438         int (*event_reserve)(struct lttng_ust_lib_ring_buffer_ctx *ctx,
 439                              uint32_t event_id);
 440         void (*event_commit)(struct lttng_ust_lib_ring_buffer_ctx *ctx);
 441         void (*event_write)(struct lttng_ust_lib_ring_buffer_ctx *ctx,
 442                         const void *src, size_t len);
 443         /*
 444          * packet_avail_size returns the available size in the current
 445          * packet. Note that the size returned is only a hint, since it
 446          * may change due to concurrent writes.
 447          */
 448         size_t (*packet_avail_size)(struct channel *chan,
 449                                     struct lttng_ust_shm_handle *handle);
 450         //wait_queue_head_t *(*get_reader_wait_queue)(struct channel *chan);
 451         //wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 452         int (*is_finalized)(struct channel *chan);
 453         int (*is_disabled)(struct channel *chan);
 454         int (*flush_buffer)(struct channel *chan, struct lttng_ust_shm_handle *handle);
 455 };
 456
 457 /*
 458  * IMPORTANT: this structure is part of the ABI between the probe and
 459  * UST. Fields need to be only added at the end, never reordered, never
 460  * removed.
 461  */
 462 struct lttng_channel {
 463         /*
 464          * The pointers located in this private data are NOT safe to be
 465          * dereferenced by the consumer. The only operations the
 466          * consumer process is designed to be allowed to do is to read
 467          * and perform subbuffer flush.
 468          */
 469         struct channel *chan;           /* Channel buffers */
 470         int enabled;
 471         struct lttng_ctx *ctx;
 472         /* Event ID management */
 473         struct lttng_session *session;
 474         int objd;                       /* Object associated to channel */
 475         unsigned int _deprecated1;
 476         unsigned int _deprecated2;
 477         struct cds_list_head node;      /* Channel list in session */
 478         const struct lttng_channel_ops *ops;
 479         int header_type;                /* 0: unset, 1: compact, 2: large */
 480         struct lttng_ust_shm_handle *handle;    /* shared-memory handle */
 481         unsigned int _deprecated3:1;
 482
 483         /* Channel ID */
 484         unsigned int id;
 485         enum lttng_ust_chan_type type;
 486         unsigned char uuid[LTTNG_UST_UUID_LEN]; /* Trace session unique ID */
 487         int tstate:1;                   /* Transient enable state */
 488 };
 489
 490 #define LTTNG_UST_EVENT_HT_BITS         12
 491 #define LTTNG_UST_EVENT_HT_SIZE         (1U << LTTNG_UST_EVENT_HT_BITS)
 492
 493 struct lttng_ust_event_ht {
 494         struct cds_hlist_head table[LTTNG_UST_EVENT_HT_SIZE];
 495 };
 496
 497 /*
 498  * IMPORTANT: this structure is part of the ABI between the probe and
 499  * UST. Fields need to be only added at the end, never reordered, never
 500  * removed.
 501  */
 502 struct lttng_session {
 503         int active;                             /* Is trace session active ? */
 504         int been_active;                        /* Been active ? */
 505         int objd;                               /* Object associated */
 506         void *_deprecated1;
 507         struct cds_list_head chan_head;         /* Channel list head */
 508         struct cds_list_head events_head;       /* list of events */
 509         struct cds_list_head _deprecated2;
 510         struct cds_list_head node;              /* Session list */
 511         int _deprecated3;
 512         unsigned int _deprecated4:1;
 513
 514         /* New UST 2.1 */
 515         /* List of enablers */
 516         struct cds_list_head enablers_head;
 517         struct lttng_ust_event_ht events_ht;    /* ht of events */
 518         void *owner;                            /* object owner */
 519         int tstate:1;                           /* Transient enable state */
 520
 521         /* New UST 2.4 */
 522         int statedump_pending:1;
 523 };
 524
 525 struct lttng_transport {
 526         char *name;
 527         struct cds_list_head node;
 528         struct lttng_channel_ops ops;
 529         const struct lttng_ust_lib_ring_buffer_config *client_config;
 530 };
 531
 532 struct lttng_session *lttng_session_create(void);
 533 int lttng_session_enable(struct lttng_session *session);
 534 int lttng_session_disable(struct lttng_session *session);
 535 void lttng_session_destroy(struct lttng_session *session);
 536
 537 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 538                                        const char *transport_name,
 539                                        void *buf_addr,
 540                                        size_t subbuf_size, size_t num_subbuf,
 541                                        unsigned int switch_timer_interval,
 542                                        unsigned int read_timer_interval,
 543                                        int **shm_fd, int **wait_fd,
 544                                        uint64_t **memory_map_size,
 545                                        struct lttng_channel *chan_priv_init);
 546
 547 int lttng_channel_enable(struct lttng_channel *channel);
 548 int lttng_channel_disable(struct lttng_channel *channel);
 549
 550 struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
 551                 struct lttng_ust_event *event_param,
 552                 struct lttng_channel *chan);
 553 int lttng_enabler_enable(struct lttng_enabler *enabler);
 554 int lttng_enabler_disable(struct lttng_enabler *enabler);
 555 int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
 556                 struct lttng_ust_filter_bytecode_node *bytecode);
 557 int lttng_enabler_attach_context(struct lttng_enabler *enabler,
 558                 struct lttng_ust_context *ctx);
 559 int lttng_enabler_attach_exclusion(struct lttng_enabler *enabler,
 560                 struct lttng_ust_excluder_node *excluder);
 561
 562 int lttng_attach_context(struct lttng_ust_context *context_param,
 563                 struct lttng_ctx **ctx, struct lttng_session *session);
 564 void lttng_context_init(void);
 565 void lttng_context_exit(void);
 566 extern struct lttng_ctx *lttng_static_ctx;      /* Used by filtering */
 567
 568 void lttng_transport_register(struct lttng_transport *transport);
 569 void lttng_transport_unregister(struct lttng_transport *transport);
 570
 571 void synchronize_trace(void);
 572
 573 int lttng_probe_register(struct lttng_probe_desc *desc);
 574 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 575 int lttng_fix_pending_events(void);
 576 int lttng_probes_init(void);
 577 void lttng_probes_exit(void);
 578 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 579 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 580 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx_p);
 581 void lttng_remove_context_field(struct lttng_ctx **ctx_p,
 582                                 struct lttng_ctx_field *field);
 583 void lttng_destroy_context(struct lttng_ctx *ctx);
 584 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 585 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 586 int lttng_add_pthread_id_to_ctx(struct lttng_ctx **ctx);
 587 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 588 int lttng_add_ip_to_ctx(struct lttng_ctx **ctx);
 589 void lttng_context_vtid_reset(void);
 590 void lttng_context_vpid_reset(void);
 591
 592 extern const struct lttng_ust_client_lib_ring_buffer_client_cb *lttng_client_callbacks_metadata;
 593 extern const struct lttng_ust_client_lib_ring_buffer_client_cb *lttng_client_callbacks_discard;
 594 extern const struct lttng_ust_client_lib_ring_buffer_client_cb *lttng_client_callbacks_overwrite;
 595
 596 struct lttng_transport *lttng_transport_find(const char *name);
 597
 598 int lttng_probes_get_event_list(struct lttng_ust_tracepoint_list *list);
 599 void lttng_probes_prune_event_list(struct lttng_ust_tracepoint_list *list);
 600 struct lttng_ust_tracepoint_iter *
 601         lttng_ust_tracepoint_list_get_iter_next(struct lttng_ust_tracepoint_list *list);
 602 int lttng_probes_get_field_list(struct lttng_ust_field_list *list);
 603 void lttng_probes_prune_field_list(struct lttng_ust_field_list *list);
 604 struct lttng_ust_field_iter *
 605         lttng_ust_field_list_get_iter_next(struct lttng_ust_field_list *list);
 606
 607 void lttng_filter_event_link_bytecode(struct lttng_event *event);
 608 void lttng_enabler_event_link_bytecode(struct lttng_event *event,
 609                 struct lttng_enabler *enabler);
 610 void lttng_free_event_filter_runtime(struct lttng_event *event);
 611 void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);
 612
 613 struct cds_list_head *lttng_get_probe_list_head(void);
 614 int lttng_session_active(void);
 615
 616 typedef int (*t_statedump_func_ptr)(struct lttng_session *session);
 617 void lttng_handle_pending_statedump(void *owner);
 618 struct cds_list_head *_lttng_get_sessions(void);
 619
 620 #ifdef __cplusplus
 621 }
 622 #endif
 623
 624 #endif /* _LTTNG_UST_EVENTS_H */