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 <stddef.h>
  33 #include <stdint.h>
  34 #include <lttng/ust-config.h>
  35 #include <lttng/ust-abi.h>
  36 #include <lttng/ust-tracer.h>
  37 #include <lttng/ust-endian.h>
  38 #include <float.h>
  39 #include <errno.h>
  40 #include <urcu/ref.h>
  41 #include <pthread.h>
  42
  43 #ifndef LTTNG_PACKED
  44 #error "LTTNG_PACKED should be defined"
  45 #endif
  46
  47 #ifdef __cplusplus
  48 extern "C" {
  49 #endif
  50
  51 #define LTTNG_UST_UUID_LEN              16
  52
  53 /*
  54  * Tracepoint provider version. Compatibility based on the major number.
  55  * Older tracepoint providers can always register to newer lttng-ust
  56  * library, but the opposite is rejected: a newer tracepoint provider is
  57  * rejected by an older lttng-ust library.
  58  */
  59 #define LTTNG_UST_PROVIDER_MAJOR        1
  60 #define LTTNG_UST_PROVIDER_MINOR        0
  61
  62 struct lttng_channel;
  63 struct lttng_session;
  64 struct lttng_ust_lib_ring_buffer_ctx;
  65 struct lttng_ust_context_app;
  66 struct lttng_event_field;
  67
  68 /*
  69  * Data structures used by tracepoint event declarations, and by the
  70  * tracer. Those structures have padding for future extension.
  71  */
  72
  73 /*
  74  * LTTng client type enumeration. Used by the consumer to map the
  75  * callbacks from its own address space.
  76  */
  77 enum lttng_client_types {
  78         LTTNG_CLIENT_METADATA = 0,
  79         LTTNG_CLIENT_DISCARD = 1,
  80         LTTNG_CLIENT_OVERWRITE = 2,
  81         LTTNG_CLIENT_DISCARD_RT = 3,
  82         LTTNG_CLIENT_OVERWRITE_RT = 4,
  83         LTTNG_NR_CLIENT_TYPES,
  84 };
  85
  86 /* Type description */
  87
  88 /* Update the astract_types name table in lttng-types.c along with this enum */
  89 enum lttng_abstract_types {
  90         atype_integer,
  91         atype_enum,
  92         atype_array,
  93         atype_sequence,
  94         atype_string,
  95         atype_float,
  96         atype_dynamic,
  97         atype_struct,
  98         NR_ABSTRACT_TYPES,
  99 };
 100
 101 /* Update the string_encodings name table in lttng-types.c along with this enum */
 102 enum lttng_string_encodings {
 103         lttng_encode_none = 0,
 104         lttng_encode_UTF8 = 1,
 105         lttng_encode_ASCII = 2,
 106         NR_STRING_ENCODINGS,
 107 };
 108
 109 struct lttng_enum_value {
 110         unsigned long long value;
 111         unsigned int signedness:1;
 112 };
 113
 114 enum lttng_enum_entry_options {
 115         LTTNG_ENUM_ENTRY_OPTION_IS_AUTO = 1U << 0,
 116 };
 117
 118 #define LTTNG_UST_ENUM_ENTRY_PADDING    16
 119 struct lttng_enum_entry {
 120         struct lttng_enum_value start, end; /* start and end are inclusive */
 121         const char *string;
 122         union {
 123                 struct {
 124                         unsigned int options;
 125                 } LTTNG_PACKED extra;
 126                 char padding[LTTNG_UST_ENUM_ENTRY_PADDING];
 127         } u;
 128 };
 129
 130 #define __type_integer(_type, _byte_order, _base, _encoding)    \
 131         {                                                       \
 132           .atype = atype_integer,                               \
 133           .u =                                                  \
 134                 {                                               \
 135                   .basic =                                      \
 136                         {                                       \
 137                           .integer =                            \
 138                                 {                               \
 139                                   .size = sizeof(_type) * CHAR_BIT,             \
 140                                   .alignment = lttng_alignof(_type) * CHAR_BIT, \
 141                                   .signedness = lttng_is_signed_type(_type),    \
 142                                   .reverse_byte_order = _byte_order != BYTE_ORDER, \
 143                                   .base = _base,                                \
 144                                   .encoding = lttng_encode_##_encoding,         \
 145                                 }                               \
 146                         }                                       \
 147                 },                                              \
 148         }                                                       \
 149
 150 #define LTTNG_UST_INTEGER_TYPE_PADDING  24
 151 struct lttng_integer_type {
 152         unsigned int size;              /* in bits */
 153         unsigned short alignment;       /* in bits */
 154         unsigned int signedness:1;
 155         unsigned int reverse_byte_order:1;
 156         unsigned int base;              /* 2, 8, 10, 16, for pretty print */
 157         enum lttng_string_encodings encoding;
 158         char padding[LTTNG_UST_INTEGER_TYPE_PADDING];
 159 };
 160
 161 /*
 162  * Only float and double are supported. long double is not supported at
 163  * the moment.
 164  */
 165 #define _float_mant_dig(_type)                                          \
 166         (sizeof(_type) == sizeof(float) ? FLT_MANT_DIG                  \
 167                 : (sizeof(_type) == sizeof(double) ? DBL_MANT_DIG       \
 168                 : 0))
 169
 170 #define __type_float(_type)                                     \
 171         {                                                       \
 172           .atype = atype_float,                                 \
 173           .u =                                                  \
 174                 {                                               \
 175                   .basic =                                      \
 176                         {                                       \
 177                           ._float =                             \
 178                                 {                               \
 179                                   .exp_dig = sizeof(_type) * CHAR_BIT           \
 180                                                   - _float_mant_dig(_type),     \
 181                                   .mant_dig = _float_mant_dig(_type),           \
 182                                   .alignment = lttng_alignof(_type) * CHAR_BIT, \
 183                                   .reverse_byte_order = BYTE_ORDER != FLOAT_WORD_ORDER, \
 184                                 }                               \
 185                         }                                       \
 186                 },                                              \
 187         }                                                       \
 188
 189 #define LTTNG_UST_FLOAT_TYPE_PADDING    24
 190 struct lttng_float_type {
 191         unsigned int exp_dig;           /* exponent digits, in bits */
 192         unsigned int mant_dig;          /* mantissa digits, in bits */
 193         unsigned short alignment;       /* in bits */
 194         unsigned int reverse_byte_order:1;
 195         char padding[LTTNG_UST_FLOAT_TYPE_PADDING];
 196 };
 197
 198 #define LTTNG_UST_BASIC_TYPE_PADDING    128
 199 union _lttng_basic_type {
 200         struct lttng_integer_type integer;
 201         struct {
 202                 const struct lttng_enum_desc *desc;     /* Enumeration mapping */
 203                 struct lttng_integer_type container_type;
 204         } enumeration;
 205         struct {
 206                 enum lttng_string_encodings encoding;
 207         } string;
 208         struct lttng_float_type _float;
 209         char padding[LTTNG_UST_BASIC_TYPE_PADDING];
 210 };
 211
 212 struct lttng_basic_type {
 213         enum lttng_abstract_types atype;
 214         union {
 215                 union _lttng_basic_type basic;
 216         } u;
 217 };
 218
 219 #define LTTNG_UST_TYPE_PADDING  128
 220 struct lttng_type {
 221         enum lttng_abstract_types atype;
 222         union {
 223                 union _lttng_basic_type basic;
 224                 struct {
 225                         struct lttng_basic_type elem_type;
 226                         unsigned int length;            /* num. elems. */
 227                 } array;
 228                 struct {
 229                         struct lttng_basic_type length_type;
 230                         struct lttng_basic_type elem_type;
 231                 } sequence;
 232                 struct {
 233                         uint32_t nr_fields;
 234                         struct lttng_event_field *fields;       /* Array of fields. */
 235                 } _struct;
 236                 char padding[LTTNG_UST_TYPE_PADDING];
 237         } u;
 238 };
 239
 240 #define LTTNG_UST_ENUM_TYPE_PADDING     24
 241 struct lttng_enum_desc {
 242         const char *name;
 243         const struct lttng_enum_entry *entries;
 244         unsigned int nr_entries;
 245         char padding[LTTNG_UST_ENUM_TYPE_PADDING];
 246 };
 247
 248 /*
 249  * Event field description
 250  *
 251  * IMPORTANT: this structure is part of the ABI between the probe and
 252  * UST. Fields need to be only added at the end, never reordered, never
 253  * removed.
 254  */
 255
 256 #define LTTNG_UST_EVENT_FIELD_PADDING   28
 257 struct lttng_event_field {
 258         const char *name;
 259         struct lttng_type type;
 260         unsigned int nowrite;   /* do not write into trace */
 261         char padding[LTTNG_UST_EVENT_FIELD_PADDING];
 262 };
 263
 264 enum lttng_ust_dynamic_type {
 265         LTTNG_UST_DYNAMIC_TYPE_NONE,
 266         LTTNG_UST_DYNAMIC_TYPE_S8,
 267         LTTNG_UST_DYNAMIC_TYPE_S16,
 268         LTTNG_UST_DYNAMIC_TYPE_S32,
 269         LTTNG_UST_DYNAMIC_TYPE_S64,
 270         LTTNG_UST_DYNAMIC_TYPE_U8,
 271         LTTNG_UST_DYNAMIC_TYPE_U16,
 272         LTTNG_UST_DYNAMIC_TYPE_U32,
 273         LTTNG_UST_DYNAMIC_TYPE_U64,
 274         LTTNG_UST_DYNAMIC_TYPE_FLOAT,
 275         LTTNG_UST_DYNAMIC_TYPE_DOUBLE,
 276         LTTNG_UST_DYNAMIC_TYPE_STRING,
 277         _NR_LTTNG_UST_DYNAMIC_TYPES,
 278 };
 279
 280 struct lttng_ctx_value {
 281         enum lttng_ust_dynamic_type sel;
 282         union {
 283                 int64_t s64;
 284                 const char *str;
 285                 double d;
 286         } u;
 287 };
 288
 289 struct lttng_perf_counter_field;
 290
 291 #define LTTNG_UST_CTX_FIELD_PADDING     40
 292 struct lttng_ctx_field {
 293         struct lttng_event_field event_field;
 294         size_t (*get_size)(struct lttng_ctx_field *field, size_t offset);
 295         void (*record)(struct lttng_ctx_field *field,
 296                        struct lttng_ust_lib_ring_buffer_ctx *ctx,
 297                        struct lttng_channel *chan);
 298         void (*get_value)(struct lttng_ctx_field *field,
 299                          struct lttng_ctx_value *value);
 300         union {
 301                 struct lttng_perf_counter_field *perf_counter;
 302                 char padding[LTTNG_UST_CTX_FIELD_PADDING];
 303         } u;
 304         void (*destroy)(struct lttng_ctx_field *field);
 305         char *field_name;       /* Has ownership, dynamically allocated. */
 306 };
 307
 308 #define LTTNG_UST_CTX_PADDING   20
 309 struct lttng_ctx {
 310         struct lttng_ctx_field *fields;
 311         unsigned int nr_fields;
 312         unsigned int allocated_fields;
 313         unsigned int largest_align;
 314         char padding[LTTNG_UST_CTX_PADDING];
 315 };
 316
 317 #define LTTNG_UST_EVENT_DESC_PADDING    40
 318 struct lttng_event_desc {
 319         const char *name;
 320         void (*probe_callback)(void);
 321         const struct lttng_event_ctx *ctx;      /* context */
 322         const struct lttng_event_field *fields; /* event payload */
 323         unsigned int nr_fields;
 324         const int **loglevel;
 325         const char *signature;  /* Argument types/names received */
 326         union {
 327                 struct {
 328                         const char **model_emf_uri;
 329                 } ext;
 330                 char padding[LTTNG_UST_EVENT_DESC_PADDING];
 331         } u;
 332 };
 333
 334 #define LTTNG_UST_PROBE_DESC_PADDING    12
 335 struct lttng_probe_desc {
 336         const char *provider;
 337         const struct lttng_event_desc **event_desc;
 338         unsigned int nr_events;
 339         struct cds_list_head head;              /* chain registered probes */
 340         struct cds_list_head lazy_init_head;
 341         int lazy;                               /* lazy registration */
 342         uint32_t major;
 343         uint32_t minor;
 344         char padding[LTTNG_UST_PROBE_DESC_PADDING];
 345 };
 346
 347 /* Data structures used by the tracer. */
 348
 349 enum lttng_enabler_type {
 350         LTTNG_ENABLER_STAR_GLOB,
 351         LTTNG_ENABLER_EVENT,
 352 };
 353
 354 /*
 355  * Enabler field, within whatever object is enabling an event. Target of
 356  * backward reference.
 357  */
 358 struct lttng_enabler {
 359         enum lttng_enabler_type type;
 360
 361         /* head list of struct lttng_ust_filter_bytecode_node */
 362         struct cds_list_head filter_bytecode_head;
 363         /* head list of struct lttng_ust_excluder_node */
 364         struct cds_list_head excluder_head;
 365         struct cds_list_head node;      /* per-session list of enablers */
 366
 367         struct lttng_ust_event event_param;
 368         struct lttng_channel *chan;
 369         /*
 370          * Unused, but kept around to make it explicit that the tracer can do
 371          * it.
 372          */
 373         struct lttng_ctx *ctx;
 374         unsigned int enabled:1;
 375 };
 376
 377 struct tp_list_entry {
 378         struct lttng_ust_tracepoint_iter tp;
 379         struct cds_list_head head;
 380 };
 381
 382 struct lttng_ust_tracepoint_list {
 383         struct tp_list_entry *iter;
 384         struct cds_list_head head;
 385 };
 386
 387 struct tp_field_list_entry {
 388         struct lttng_ust_field_iter field;
 389         struct cds_list_head head;
 390 };
 391
 392 struct lttng_ust_field_list {
 393         struct tp_field_list_entry *iter;
 394         struct cds_list_head head;
 395 };
 396
 397 struct ust_pending_probe;
 398 struct lttng_event;
 399
 400 struct lttng_ust_filter_bytecode_node {
 401         struct cds_list_head node;
 402         struct lttng_enabler *enabler;
 403         /*
 404          * struct lttng_ust_filter_bytecode has var. sized array, must
 405          * be last field.
 406          */
 407         struct lttng_ust_filter_bytecode bc;
 408 };
 409
 410 struct lttng_ust_excluder_node {
 411         struct cds_list_head node;
 412         struct lttng_enabler *enabler;
 413         /*
 414          * struct lttng_ust_event_exclusion had variable sized array,
 415          * must be last field.
 416          */
 417         struct lttng_ust_event_exclusion excluder;
 418 };
 419 /*
 420  * Filter return value masks.
 421  */
 422 enum lttng_filter_ret {
 423         LTTNG_FILTER_DISCARD = 0,
 424         LTTNG_FILTER_RECORD_FLAG = (1ULL << 0),
 425         /* Other bits are kept for future use. */
 426 };
 427
 428 struct lttng_bytecode_runtime {
 429         /* Associated bytecode */
 430         struct lttng_ust_filter_bytecode_node *bc;
 431         uint64_t (*filter)(void *filter_data, const char *filter_stack_data);
 432         int link_failed;
 433         struct cds_list_head node;      /* list of bytecode runtime in event */
 434         struct lttng_session *session;
 435         struct lttng_event *event;
 436 };
 437
 438 /*
 439  * Objects in a linked-list of enablers, owned by an event.
 440  */
 441 struct lttng_enabler_ref {
 442         struct cds_list_head node;              /* enabler ref list */
 443         struct lttng_enabler *ref;              /* backward ref */
 444 };
 445
 446 /*
 447  * lttng_event structure is referred to by the tracing fast path. It
 448  * must be kept small.
 449  *
 450  * IMPORTANT: this structure is part of the ABI between the probe and
 451  * UST. Fields need to be only added at the end, never reordered, never
 452  * removed.
 453  */
 454 struct lttng_event {
 455         /* LTTng-UST 2.0 starts here */
 456         unsigned int id;
 457         struct lttng_channel *chan;
 458         int enabled;
 459         const struct lttng_event_desc *desc;
 460         void *_deprecated1;
 461         struct lttng_ctx *ctx;
 462         enum lttng_ust_instrumentation instrumentation;
 463         struct cds_list_head node;              /* Event list in session */
 464         struct cds_list_head _deprecated2;
 465         void *_deprecated3;
 466         unsigned int _deprecated4:1;
 467
 468         /* LTTng-UST 2.1 starts here */
 469         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 470         struct cds_list_head bytecode_runtime_head;
 471         int has_enablers_without_bytecode;
 472         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 473         struct cds_list_head enablers_ref_head;
 474         struct cds_hlist_node hlist;    /* session ht of events */
 475         int registered;                 /* has reg'd tracepoint probe */
 476 };
 477
 478 struct lttng_enum {
 479         const struct lttng_enum_desc *desc;
 480         struct lttng_session *session;
 481         struct cds_list_head node;      /* Enum list in session */
 482         struct cds_hlist_node hlist;    /* Session ht of enums */
 483         uint64_t id;                    /* Enumeration ID in sessiond */
 484 };
 485
 486 struct channel;
 487 struct lttng_ust_shm_handle;
 488
 489 /*
 490  * IMPORTANT: this structure is part of the ABI between the probe and
 491  * UST. Fields need to be only added at the end, never reordered, never
 492  * removed.
 493  */
 494 struct lttng_channel_ops {
 495         struct lttng_channel *(*channel_create)(const char *name,
 496                         void *buf_addr,
 497                         size_t subbuf_size, size_t num_subbuf,
 498                         unsigned int switch_timer_interval,
 499                         unsigned int read_timer_interval,
 500                         unsigned char *uuid,
 501                         uint32_t chan_id,
 502                         const int *stream_fds, int nr_stream_fds,
 503                         int64_t blocking_timeout);
 504         void (*channel_destroy)(struct lttng_channel *chan);
 505         union {
 506                 void *_deprecated1;
 507                 unsigned long has_strcpy:1;             /* ABI has strcpy */
 508         } u;
 509         void *_deprecated2;
 510         int (*event_reserve)(struct lttng_ust_lib_ring_buffer_ctx *ctx,
 511                              uint32_t event_id);
 512         void (*event_commit)(struct lttng_ust_lib_ring_buffer_ctx *ctx);
 513         void (*event_write)(struct lttng_ust_lib_ring_buffer_ctx *ctx,
 514                         const void *src, size_t len);
 515         /*
 516          * packet_avail_size returns the available size in the current
 517          * packet. Note that the size returned is only a hint, since it
 518          * may change due to concurrent writes.
 519          */
 520         size_t (*packet_avail_size)(struct channel *chan,
 521                                     struct lttng_ust_shm_handle *handle);
 522         //wait_queue_head_t *(*get_reader_wait_queue)(struct channel *chan);
 523         //wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 524         int (*is_finalized)(struct channel *chan);
 525         int (*is_disabled)(struct channel *chan);
 526         int (*flush_buffer)(struct channel *chan, struct lttng_ust_shm_handle *handle);
 527         void (*event_strcpy)(struct lttng_ust_lib_ring_buffer_ctx *ctx,
 528                         const char *src, size_t len);
 529 };
 530
 531 /*
 532  * IMPORTANT: this structure is part of the ABI between the probe and
 533  * UST. Fields need to be only added at the end, never reordered, never
 534  * removed.
 535  */
 536 struct lttng_channel {
 537         /*
 538          * The pointers located in this private data are NOT safe to be
 539          * dereferenced by the consumer. The only operations the
 540          * consumer process is designed to be allowed to do is to read
 541          * and perform subbuffer flush.
 542          */
 543         struct channel *chan;           /* Channel buffers */
 544         int enabled;
 545         struct lttng_ctx *ctx;
 546         /* Event ID management */
 547         struct lttng_session *session;
 548         int objd;                       /* Object associated to channel */
 549         unsigned int _deprecated1;
 550         unsigned int _deprecated2;
 551         struct cds_list_head node;      /* Channel list in session */
 552         const struct lttng_channel_ops *ops;
 553         int header_type;                /* 0: unset, 1: compact, 2: large */
 554         struct lttng_ust_shm_handle *handle;    /* shared-memory handle */
 555         unsigned int _deprecated3:1;
 556
 557         /* Channel ID */
 558         unsigned int id;
 559         enum lttng_ust_chan_type type;
 560         unsigned char uuid[LTTNG_UST_UUID_LEN]; /* Trace session unique ID */
 561         int tstate:1;                   /* Transient enable state */
 562 };
 563
 564 #define LTTNG_UST_STACK_CTX_PADDING     32
 565 struct lttng_stack_ctx {
 566         struct lttng_event *event;
 567         struct lttng_ctx *chan_ctx;     /* RCU dereferenced. */
 568         struct lttng_ctx *event_ctx;    /* RCU dereferenced. */
 569         char padding[LTTNG_UST_STACK_CTX_PADDING];
 570 };
 571
 572 #define LTTNG_UST_EVENT_HT_BITS         12
 573 #define LTTNG_UST_EVENT_HT_SIZE         (1U << LTTNG_UST_EVENT_HT_BITS)
 574
 575 struct lttng_ust_event_ht {
 576         struct cds_hlist_head table[LTTNG_UST_EVENT_HT_SIZE];
 577 };
 578
 579 #define LTTNG_UST_ENUM_HT_BITS          12
 580 #define LTTNG_UST_ENUM_HT_SIZE          (1U << LTTNG_UST_ENUM_HT_BITS)
 581
 582 struct lttng_ust_enum_ht {
 583         struct cds_hlist_head table[LTTNG_UST_ENUM_HT_SIZE];
 584 };
 585
 586 /*
 587  * IMPORTANT: this structure is part of the ABI between the probe and
 588  * UST. Fields need to be only added at the end, never reordered, never
 589  * removed.
 590  */
 591 struct lttng_session {
 592         int active;                             /* Is trace session active ? */
 593         int been_active;                        /* Been active ? */
 594         int objd;                               /* Object associated */
 595         void *_deprecated1;
 596         struct cds_list_head chan_head;         /* Channel list head */
 597         struct cds_list_head events_head;       /* list of events */
 598         struct cds_list_head _deprecated2;
 599         struct cds_list_head node;              /* Session list */
 600         int _deprecated3;
 601         unsigned int _deprecated4:1;
 602
 603         /* New UST 2.1 */
 604         /* List of enablers */
 605         struct cds_list_head enablers_head;
 606         struct lttng_ust_event_ht events_ht;    /* ht of events */
 607         void *owner;                            /* object owner */
 608         int tstate:1;                           /* Transient enable state */
 609
 610         /* New UST 2.4 */
 611         int statedump_pending:1;
 612
 613         /* New UST 2.8 */
 614         struct lttng_ust_enum_ht enums_ht;      /* ht of enumerations */
 615         struct cds_list_head enums_head;
 616         struct lttng_ctx *ctx;                  /* contexts for filters. */
 617 };
 618
 619 struct lttng_transport {
 620         char *name;
 621         struct cds_list_head node;
 622         struct lttng_channel_ops ops;
 623         const struct lttng_ust_lib_ring_buffer_config *client_config;
 624 };
 625
 626 struct lttng_session *lttng_session_create(void);
 627 int lttng_session_enable(struct lttng_session *session);
 628 int lttng_session_disable(struct lttng_session *session);
 629 int lttng_session_statedump(struct lttng_session *session);
 630 void lttng_session_destroy(struct lttng_session *session);
 631
 632 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 633                                        const char *transport_name,
 634                                        void *buf_addr,
 635                                        size_t subbuf_size, size_t num_subbuf,
 636                                        unsigned int switch_timer_interval,
 637                                        unsigned int read_timer_interval,
 638                                        int **shm_fd, int **wait_fd,
 639                                        uint64_t **memory_map_size,
 640                                        struct lttng_channel *chan_priv_init);
 641
 642 int lttng_channel_enable(struct lttng_channel *channel);
 643 int lttng_channel_disable(struct lttng_channel *channel);
 644
 645 struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
 646                 struct lttng_ust_event *event_param,
 647                 struct lttng_channel *chan);
 648 int lttng_enabler_enable(struct lttng_enabler *enabler);
 649 int lttng_enabler_disable(struct lttng_enabler *enabler);
 650 int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
 651                 struct lttng_ust_filter_bytecode_node *bytecode);
 652 int lttng_enabler_attach_context(struct lttng_enabler *enabler,
 653                 struct lttng_ust_context *ctx);
 654 int lttng_enabler_attach_exclusion(struct lttng_enabler *enabler,
 655                 struct lttng_ust_excluder_node *excluder);
 656
 657 int lttng_attach_context(struct lttng_ust_context *context_param,
 658                 union ust_args *uargs,
 659                 struct lttng_ctx **ctx, struct lttng_session *session);
 660 int lttng_session_context_init(struct lttng_ctx **ctx);
 661
 662 void lttng_transport_register(struct lttng_transport *transport);
 663 void lttng_transport_unregister(struct lttng_transport *transport);
 664
 665 void synchronize_trace(void);
 666
 667 int lttng_probe_register(struct lttng_probe_desc *desc);
 668 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 669 void lttng_probe_provider_unregister_events(struct lttng_probe_desc *desc);
 670 int lttng_fix_pending_events(void);
 671 int lttng_probes_init(void);
 672 void lttng_probes_exit(void);
 673 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 674 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 675 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx_p);
 676 void lttng_context_update(struct lttng_ctx *ctx);
 677 void lttng_remove_context_field(struct lttng_ctx **ctx_p,
 678                                 struct lttng_ctx_field *field);
 679 void lttng_destroy_context(struct lttng_ctx *ctx);
 680 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 681 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 682 int lttng_add_pthread_id_to_ctx(struct lttng_ctx **ctx);
 683 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 684 int lttng_add_ip_to_ctx(struct lttng_ctx **ctx);
 685 int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
 686 int lttng_add_dyntest_to_ctx(struct lttng_ctx **ctx);
 687 int lttng_add_cgroup_ns_to_ctx(struct lttng_ctx **ctx);
 688 int lttng_add_ipc_ns_to_ctx(struct lttng_ctx **ctx);
 689 int lttng_add_mnt_ns_to_ctx(struct lttng_ctx **ctx);
 690 int lttng_add_net_ns_to_ctx(struct lttng_ctx **ctx);
 691 int lttng_add_pid_ns_to_ctx(struct lttng_ctx **ctx);
 692 int lttng_add_user_ns_to_ctx(struct lttng_ctx **ctx);
 693 int lttng_add_uts_ns_to_ctx(struct lttng_ctx **ctx);
 694 int lttng_add_vuid_to_ctx(struct lttng_ctx **ctx);
 695 int lttng_add_veuid_to_ctx(struct lttng_ctx **ctx);
 696 int lttng_add_vsuid_to_ctx(struct lttng_ctx **ctx);
 697 int lttng_add_vgid_to_ctx(struct lttng_ctx **ctx);
 698 int lttng_add_vegid_to_ctx(struct lttng_ctx **ctx);
 699 int lttng_add_vsgid_to_ctx(struct lttng_ctx **ctx);
 700 void lttng_context_vtid_reset(void);
 701 void lttng_context_vpid_reset(void);
 702 void lttng_context_procname_reset(void);
 703 void lttng_context_cgroup_ns_reset(void);
 704 void lttng_context_ipc_ns_reset(void);
 705 void lttng_context_mnt_ns_reset(void);
 706 void lttng_context_net_ns_reset(void);
 707 void lttng_context_pid_ns_reset(void);
 708 void lttng_context_user_ns_reset(void);
 709 void lttng_context_uts_ns_reset(void);
 710 void lttng_context_vuid_reset(void);
 711 void lttng_context_veuid_reset(void);
 712 void lttng_context_vsuid_reset(void);
 713 void lttng_context_vgid_reset(void);
 714 void lttng_context_vegid_reset(void);
 715 void lttng_context_vsgid_reset(void);
 716
 717 #ifdef LTTNG_UST_HAVE_PERF_EVENT
 718 int lttng_add_perf_counter_to_ctx(uint32_t type,
 719                                   uint64_t config,
 720                                   const char *name,
 721                                   struct lttng_ctx **ctx);
 722 int lttng_perf_counter_init(void);
 723 void lttng_perf_counter_exit(void);
 724 #else /* #ifdef LTTNG_UST_HAVE_PERF_EVENT */
 725 static inline
 726 int lttng_add_perf_counter_to_ctx(uint32_t type,
 727                                   uint64_t config,
 728                                   const char *name,
 729                                   struct lttng_ctx **ctx)
 730 {
 731         return -ENOSYS;
 732 }
 733 static inline
 734 int lttng_perf_counter_init(void)
 735 {
 736         return 0;
 737 }
 738 static inline
 739 void lttng_perf_counter_exit(void)
 740 {
 741 }
 742 #endif /* #else #ifdef LTTNG_UST_HAVE_PERF_EVENT */
 743
 744 extern const struct lttng_ust_client_lib_ring_buffer_client_cb *lttng_client_callbacks_metadata;
 745 extern const struct lttng_ust_client_lib_ring_buffer_client_cb *lttng_client_callbacks_discard;
 746 extern const struct lttng_ust_client_lib_ring_buffer_client_cb *lttng_client_callbacks_overwrite;
 747
 748 struct lttng_transport *lttng_transport_find(const char *name);
 749
 750 int lttng_probes_get_event_list(struct lttng_ust_tracepoint_list *list);
 751 void lttng_probes_prune_event_list(struct lttng_ust_tracepoint_list *list);
 752 struct lttng_ust_tracepoint_iter *
 753         lttng_ust_tracepoint_list_get_iter_next(struct lttng_ust_tracepoint_list *list);
 754 int lttng_probes_get_field_list(struct lttng_ust_field_list *list);
 755 void lttng_probes_prune_field_list(struct lttng_ust_field_list *list);
 756 struct lttng_ust_field_iter *
 757         lttng_ust_field_list_get_iter_next(struct lttng_ust_field_list *list);
 758
 759 void lttng_enabler_event_link_bytecode(struct lttng_event *event,
 760                 struct lttng_enabler *enabler);
 761 void lttng_free_event_filter_runtime(struct lttng_event *event);
 762 void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);
 763
 764 struct cds_list_head *lttng_get_probe_list_head(void);
 765 int lttng_session_active(void);
 766
 767 typedef int (*t_statedump_func_ptr)(struct lttng_session *session);
 768 void lttng_handle_pending_statedump(void *owner);
 769 struct cds_list_head *_lttng_get_sessions(void);
 770
 771 struct lttng_enum *lttng_ust_enum_get_from_desc(struct lttng_session *session,
 772                 const struct lttng_enum_desc *enum_desc);
 773
 774 void lttng_ust_dl_update(void *ip);
 775 void lttng_ust_fixup_fd_tracker_tls(void);
 776
 777 /* For backward compatibility. Leave those exported symbols in place. */
 778 extern struct lttng_ctx *lttng_static_ctx;
 779 void lttng_context_init(void);
 780 void lttng_context_exit(void);
 781 void lttng_filter_event_link_bytecode(struct lttng_event *event);
 782
 783 #ifdef __cplusplus
 784 }
 785 #endif
 786
 787 #endif /* _LTTNG_UST_EVENTS_H */