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         union {
 437                 void *_deprecated1;
 438                 unsigned long has_strcpy:1;             /* ABI has strcpy */
 439         } u;
 440         void *_deprecated2;
 441         int (*event_reserve)(struct lttng_ust_lib_ring_buffer_ctx *ctx,
 442                              uint32_t event_id);
 443         void (*event_commit)(struct lttng_ust_lib_ring_buffer_ctx *ctx);
 444         void (*event_write)(struct lttng_ust_lib_ring_buffer_ctx *ctx,
 445                         const void *src, size_t len);
 446         /*
 447          * packet_avail_size returns the available size in the current
 448          * packet. Note that the size returned is only a hint, since it
 449          * may change due to concurrent writes.
 450          */
 451         size_t (*packet_avail_size)(struct channel *chan,
 452                                     struct lttng_ust_shm_handle *handle);
 453         //wait_queue_head_t *(*get_reader_wait_queue)(struct channel *chan);
 454         //wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 455         int (*is_finalized)(struct channel *chan);
 456         int (*is_disabled)(struct channel *chan);
 457         int (*flush_buffer)(struct channel *chan, struct lttng_ust_shm_handle *handle);
 458         void (*event_strcpy)(struct lttng_ust_lib_ring_buffer_ctx *ctx,
 459                         const char *src, size_t len);
 460 };
 461
 462 /*
 463  * IMPORTANT: this structure is part of the ABI between the probe and
 464  * UST. Fields need to be only added at the end, never reordered, never
 465  * removed.
 466  */
 467 struct lttng_channel {
 468         /*
 469          * The pointers located in this private data are NOT safe to be
 470          * dereferenced by the consumer. The only operations the
 471          * consumer process is designed to be allowed to do is to read
 472          * and perform subbuffer flush.
 473          */
 474         struct channel *chan;           /* Channel buffers */
 475         int enabled;
 476         struct lttng_ctx *ctx;
 477         /* Event ID management */
 478         struct lttng_session *session;
 479         int objd;                       /* Object associated to channel */
 480         unsigned int _deprecated1;
 481         unsigned int _deprecated2;
 482         struct cds_list_head node;      /* Channel list in session */
 483         const struct lttng_channel_ops *ops;
 484         int header_type;                /* 0: unset, 1: compact, 2: large */
 485         struct lttng_ust_shm_handle *handle;    /* shared-memory handle */
 486         unsigned int _deprecated3:1;
 487
 488         /* Channel ID */
 489         unsigned int id;
 490         enum lttng_ust_chan_type type;
 491         unsigned char uuid[LTTNG_UST_UUID_LEN]; /* Trace session unique ID */
 492         int tstate:1;                   /* Transient enable state */
 493 };
 494
 495 #define LTTNG_UST_EVENT_HT_BITS         12
 496 #define LTTNG_UST_EVENT_HT_SIZE         (1U << LTTNG_UST_EVENT_HT_BITS)
 497
 498 struct lttng_ust_event_ht {
 499         struct cds_hlist_head table[LTTNG_UST_EVENT_HT_SIZE];
 500 };
 501
 502 /*
 503  * IMPORTANT: this structure is part of the ABI between the probe and
 504  * UST. Fields need to be only added at the end, never reordered, never
 505  * removed.
 506  */
 507 struct lttng_session {
 508         int active;                             /* Is trace session active ? */
 509         int been_active;                        /* Been active ? */
 510         int objd;                               /* Object associated */
 511         void *_deprecated1;
 512         struct cds_list_head chan_head;         /* Channel list head */
 513         struct cds_list_head events_head;       /* list of events */
 514         struct cds_list_head _deprecated2;
 515         struct cds_list_head node;              /* Session list */
 516         int _deprecated3;
 517         unsigned int _deprecated4:1;
 518
 519         /* New UST 2.1 */
 520         /* List of enablers */
 521         struct cds_list_head enablers_head;
 522         struct lttng_ust_event_ht events_ht;    /* ht of events */
 523         void *owner;                            /* object owner */
 524         int tstate:1;                           /* Transient enable state */
 525
 526         /* New UST 2.4 */
 527         int statedump_pending:1;
 528 };
 529
 530 struct lttng_transport {
 531         char *name;
 532         struct cds_list_head node;
 533         struct lttng_channel_ops ops;
 534         const struct lttng_ust_lib_ring_buffer_config *client_config;
 535 };
 536
 537 struct lttng_session *lttng_session_create(void);
 538 int lttng_session_enable(struct lttng_session *session);
 539 int lttng_session_disable(struct lttng_session *session);
 540 void lttng_session_destroy(struct lttng_session *session);
 541
 542 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 543                                        const char *transport_name,
 544                                        void *buf_addr,
 545                                        size_t subbuf_size, size_t num_subbuf,
 546                                        unsigned int switch_timer_interval,
 547                                        unsigned int read_timer_interval,
 548                                        int **shm_fd, int **wait_fd,
 549                                        uint64_t **memory_map_size,
 550                                        struct lttng_channel *chan_priv_init);
 551
 552 int lttng_channel_enable(struct lttng_channel *channel);
 553 int lttng_channel_disable(struct lttng_channel *channel);
 554
 555 struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
 556                 struct lttng_ust_event *event_param,
 557                 struct lttng_channel *chan);
 558 int lttng_enabler_enable(struct lttng_enabler *enabler);
 559 int lttng_enabler_disable(struct lttng_enabler *enabler);
 560 int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
 561                 struct lttng_ust_filter_bytecode_node *bytecode);
 562 int lttng_enabler_attach_context(struct lttng_enabler *enabler,
 563                 struct lttng_ust_context *ctx);
 564 int lttng_enabler_attach_exclusion(struct lttng_enabler *enabler,
 565                 struct lttng_ust_excluder_node *excluder);
 566
 567 int lttng_attach_context(struct lttng_ust_context *context_param,
 568                 struct lttng_ctx **ctx, struct lttng_session *session);
 569 void lttng_context_init(void);
 570 void lttng_context_exit(void);
 571 extern struct lttng_ctx *lttng_static_ctx;      /* Used by filtering */
 572
 573 void lttng_transport_register(struct lttng_transport *transport);
 574 void lttng_transport_unregister(struct lttng_transport *transport);
 575
 576 void synchronize_trace(void);
 577
 578 int lttng_probe_register(struct lttng_probe_desc *desc);
 579 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 580 int lttng_fix_pending_events(void);
 581 int lttng_probes_init(void);
 582 void lttng_probes_exit(void);
 583 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 584 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 585 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx_p);
 586 void lttng_remove_context_field(struct lttng_ctx **ctx_p,
 587                                 struct lttng_ctx_field *field);
 588 void lttng_destroy_context(struct lttng_ctx *ctx);
 589 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 590 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 591 int lttng_add_pthread_id_to_ctx(struct lttng_ctx **ctx);
 592 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 593 int lttng_add_ip_to_ctx(struct lttng_ctx **ctx);
 594 void lttng_context_vtid_reset(void);
 595 void lttng_context_vpid_reset(void);
 596
 597 extern const struct lttng_ust_client_lib_ring_buffer_client_cb *lttng_client_callbacks_metadata;
 598 extern const struct lttng_ust_client_lib_ring_buffer_client_cb *lttng_client_callbacks_discard;
 599 extern const struct lttng_ust_client_lib_ring_buffer_client_cb *lttng_client_callbacks_overwrite;
 600
 601 struct lttng_transport *lttng_transport_find(const char *name);
 602
 603 int lttng_probes_get_event_list(struct lttng_ust_tracepoint_list *list);
 604 void lttng_probes_prune_event_list(struct lttng_ust_tracepoint_list *list);
 605 struct lttng_ust_tracepoint_iter *
 606         lttng_ust_tracepoint_list_get_iter_next(struct lttng_ust_tracepoint_list *list);
 607 int lttng_probes_get_field_list(struct lttng_ust_field_list *list);
 608 void lttng_probes_prune_field_list(struct lttng_ust_field_list *list);
 609 struct lttng_ust_field_iter *
 610         lttng_ust_field_list_get_iter_next(struct lttng_ust_field_list *list);
 611
 612 void lttng_filter_event_link_bytecode(struct lttng_event *event);
 613 void lttng_enabler_event_link_bytecode(struct lttng_event *event,
 614                 struct lttng_enabler *enabler);
 615 void lttng_free_event_filter_runtime(struct lttng_event *event);
 616 void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);
 617
 618 struct cds_list_head *lttng_get_probe_list_head(void);
 619 int lttng_session_active(void);
 620
 621 typedef int (*t_statedump_func_ptr)(struct lttng_session *session);
 622 void lttng_handle_pending_statedump(void *owner);
 623 struct cds_list_head *_lttng_get_sessions(void);
 624
 625 #ifdef __cplusplus
 626 }
 627 #endif
 628
 629 #endif /* _LTTNG_UST_EVENTS_H */