src/bin/lttng-sessiond/ust-app.hpp

   1 /*
   2  * Copyright (C) 2011 EfficiOS Inc.
   3  * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   4  *
   5  * SPDX-License-Identifier: GPL-2.0-only
   6  *
   7  */
   8
   9 #ifndef _LTT_UST_APP_H
  10 #define _LTT_UST_APP_H
  11
  12 #include <stdint.h>
  13
  14 #include <common/index-allocator.hpp>
  15 #include <common/format.hpp>
  16 #include <common/uuid.hpp>
  17
  18 #include "trace-ust.hpp"
  19 #include "ust-registry.hpp"
  20 #include "ust-registry-session.hpp"
  21 #include "session.hpp"
  22 #include "ust-field-convert.hpp"
  23
  24 #define UST_APP_EVENT_LIST_SIZE 32
  25
  26 /* Process name (short). */
  27 #define UST_APP_PROCNAME_LEN    16
  28
  29 struct lttng_bytecode;
  30 struct lttng_ust_filter_bytecode;
  31
  32 extern int the_ust_consumerd64_fd, the_ust_consumerd32_fd;
  33
  34 /*
  35  * Object used to close the notify socket in a call_rcu(). Since the
  36  * application might not be found, we need an independant object containing the
  37  * notify socket fd.
  38  */
  39 struct ust_app_notify_sock_obj {
  40         int fd;
  41         struct rcu_head head;
  42 };
  43
  44 struct ust_app_ht_key {
  45         const char *name;
  46         const struct lttng_bytecode *filter;
  47         enum lttng_ust_abi_loglevel_type loglevel_type;
  48         const struct lttng_event_exclusion *exclusion;
  49 };
  50
  51 /*
  52  * Application registration data structure.
  53  */
  54 struct ust_register_msg {
  55         enum lttng_ust_ctl_socket_type type;
  56         uint32_t major;
  57         uint32_t minor;
  58         uint32_t abi_major;
  59         uint32_t abi_minor;
  60         pid_t pid;
  61         pid_t ppid;
  62         uid_t uid;
  63         gid_t gid;
  64         uint32_t bits_per_long;
  65         uint32_t uint8_t_alignment;
  66         uint32_t uint16_t_alignment;
  67         uint32_t uint32_t_alignment;
  68         uint32_t uint64_t_alignment;
  69         uint32_t long_alignment;
  70         int byte_order;         /* BIG_ENDIAN or LITTLE_ENDIAN */
  71         char name[LTTNG_UST_ABI_PROCNAME_LEN];
  72 };
  73
  74 /*
  75  * Global applications HT used by the session daemon. This table is indexed by
  76  * PID using the pid_n node and pid value of an ust_app.
  77  */
  78 extern struct lttng_ht *ust_app_ht;
  79
  80 /*
  81  * Global applications HT used by the session daemon. This table is indexed by
  82  * socket using the sock_n node and sock value of an ust_app.
  83  *
  84  * The 'sock' in question here is the 'command' socket.
  85  */
  86 extern struct lttng_ht *ust_app_ht_by_sock;
  87
  88 /*
  89  * Global applications HT used by the session daemon. This table is indexed by
  90  * socket using the notify_sock_n node and notify_sock value of an ust_app.
  91  */
  92 extern struct lttng_ht *ust_app_ht_by_notify_sock;
  93
  94 /* Stream list containing ust_app_stream. */
  95 struct ust_app_stream_list {
  96         unsigned int count;
  97         struct cds_list_head head;
  98 };
  99
 100 struct ust_app_ctx {
 101         int handle;
 102         struct lttng_ust_context_attr ctx;
 103         struct lttng_ust_abi_object_data *obj;
 104         struct lttng_ht_node_ulong node;
 105         struct cds_list_head list;
 106 };
 107
 108 struct ust_app_event {
 109         bool enabled;
 110         int handle;
 111         struct lttng_ust_abi_object_data *obj;
 112         struct lttng_ust_abi_event attr;
 113         char name[LTTNG_UST_ABI_SYM_NAME_LEN];
 114         struct lttng_ht_node_str node;
 115         struct lttng_bytecode *filter;
 116         struct lttng_event_exclusion *exclusion;
 117 };
 118
 119 struct ust_app_event_notifier_rule {
 120         bool enabled;
 121         uint64_t error_counter_index;
 122         int handle;
 123         struct lttng_ust_abi_object_data *obj;
 124         /* Holds a strong reference. */
 125         struct lttng_trigger *trigger;
 126         /* Unique ID returned by the tracer to identify this event notifier. */
 127         uint64_t token;
 128         struct lttng_ht_node_u64 node;
 129         /* The trigger object owns the filter. */
 130         const struct lttng_bytecode *filter;
 131         /* Owned by this. */
 132         struct lttng_event_exclusion *exclusion;
 133         /* For delayed reclaim. */
 134         struct rcu_head rcu_head;
 135 };
 136
 137 struct ust_app_stream {
 138         int handle;
 139         char pathname[PATH_MAX];
 140         /* Format is %s_%d respectively channel name and CPU number. */
 141         char name[DEFAULT_STREAM_NAME_LEN];
 142         struct lttng_ust_abi_object_data *obj;
 143         /* Using a list of streams to keep order. */
 144         struct cds_list_head list;
 145 };
 146
 147 struct ust_app_channel {
 148         bool enabled;
 149         int handle;
 150         /*
 151          * Unique key used to identify the channel on the consumer side.
 152          * 0 is a reserved 'invalid' value used to indicate that the consumer
 153          * does not know about this channel (i.e. an error occurred).
 154          */
 155         uint64_t key;
 156         /* Id of the tracing channel set on creation. */
 157         uint64_t tracing_channel_id;
 158         /* Number of stream that this channel is expected to receive. */
 159         unsigned int expected_stream_count;
 160         char name[LTTNG_UST_ABI_SYM_NAME_LEN];
 161         struct lttng_ust_abi_object_data *obj;
 162         struct lttng_ust_ctl_consumer_channel_attr attr;
 163         struct ust_app_stream_list streams;
 164         /* Session pointer that owns this object. */
 165         struct ust_app_session *session;
 166         /*
 167          * Contexts are kept in a hash table for fast lookup and in an ordered list
 168          * so we are able to enable them on the tracer side in the same order the
 169          * user added them.
 170          */
 171         struct lttng_ht *ctx;
 172         struct cds_list_head ctx_list;
 173
 174         struct lttng_ht *events;
 175         uint64_t tracefile_size;
 176         uint64_t tracefile_count;
 177         uint64_t monitor_timer_interval;
 178         /*
 179          * Node indexed by channel name in the channels' hash table of a session.
 180          */
 181         struct lttng_ht_node_str node;
 182         /*
 183          * Node indexed by UST channel object descriptor (handle). Stored in the
 184          * ust_objd hash table in the ust_app object.
 185          */
 186         struct lttng_ht_node_ulong ust_objd_node;
 187         /* For delayed reclaim */
 188         struct rcu_head rcu_head;
 189 };
 190
 191 struct ust_app_session {
 192         /*
 193          * Lock protecting this session's ust app interaction. Held
 194          * across command send/recv to/from app. Never nests within the
 195          * session registry lock.
 196          */
 197         pthread_mutex_t lock;
 198
 199         bool enabled;
 200         /* started: has the session been in started state at any time ? */
 201         bool started;  /* allows detection of start vs restart. */
 202         int handle;   /* used has unique identifier for app session */
 203
 204         bool deleted;   /* Session deleted flag. Check with lock held. */
 205
 206         /*
 207          * Tracing session ID. Multiple ust app session can have the same tracing
 208          * session id making this value NOT unique to the object.
 209          */
 210         uint64_t tracing_id;
 211         uint64_t id;    /* Unique session identifier */
 212         struct lttng_ht *channels; /* Registered channels */
 213         struct lttng_ht_node_u64 node;
 214         /*
 215          * Node indexed by UST session object descriptor (handle). Stored in the
 216          * ust_sessions_objd hash table in the ust_app object.
 217          */
 218         struct lttng_ht_node_ulong ust_objd_node;
 219         /* Starts with 'ust'; no leading slash. */
 220         char path[PATH_MAX];
 221         /* UID/GID of the application owning the session */
 222         struct lttng_credentials real_credentials;
 223         /* Effective UID and GID. Same as the tracing session. */
 224         struct lttng_credentials effective_credentials;
 225         struct cds_list_head teardown_node;
 226         /*
 227          * Once at least *one* session is created onto the application, the
 228          * corresponding consumer is set so we can use it on unregistration.
 229          */
 230         struct consumer_output *consumer;
 231         enum lttng_buffer_type buffer_type;
 232         /* ABI of the session. Same value as the application. */
 233         uint32_t bits_per_long;
 234         /* For delayed reclaim */
 235         struct rcu_head rcu_head;
 236         /* If the channel's streams have to be outputed or not. */
 237         unsigned int output_traces;
 238         unsigned int live_timer_interval;       /* usec */
 239
 240         /* Metadata channel attributes. */
 241         struct lttng_ust_ctl_consumer_channel_attr metadata_attr;
 242
 243         char root_shm_path[PATH_MAX];
 244         char shm_path[PATH_MAX];
 245 };
 246
 247 /*
 248  * Registered traceable applications. Libust registers to the session daemon
 249  * and a linked list is kept of all running traceable app.
 250  */
 251 struct ust_app {
 252         int sock;
 253         pthread_mutex_t sock_lock;      /* Protects sock protocol. */
 254
 255         int notify_sock;
 256         pid_t pid;
 257         pid_t ppid;
 258         uid_t uid;           /* User ID that owns the apps */
 259         gid_t gid;           /* Group ID that owns the apps */
 260
 261         /* App ABI. */
 262         lttng::sessiond::trace::abi abi;
 263
 264         int compatible; /* If the lttng-ust tracer version does not match the
 265                                            supported version of the session daemon, this flag is
 266                                            set to 0 (NOT compatible) else 1. */
 267         struct lttng_ust_abi_tracer_version version;
 268         uint32_t v_major;    /* Version major number */
 269         uint32_t v_minor;    /* Version minor number */
 270         /* Extra for the NULL byte. */
 271         char name[UST_APP_PROCNAME_LEN + 1];
 272         /* Type of buffer this application uses. */
 273         enum lttng_buffer_type buffer_type;
 274         struct lttng_ht *sessions;
 275         struct lttng_ht_node_ulong pid_n;
 276         struct lttng_ht_node_ulong sock_n;
 277         struct lttng_ht_node_ulong notify_sock_n;
 278         /*
 279          * This is a list of ust app session that, once the app is going into
 280          * teardown mode, in the RCU call, each node in this list is removed and
 281          * deleted.
 282          *
 283          * Element of the list are added when an application unregisters after each
 284          * ht_del of ust_app_session associated to this app. This list is NOT used
 285          * when a session is destroyed.
 286          */
 287         struct cds_list_head teardown_head;
 288         /*
 289          * Hash table containing ust_app_channel indexed by channel objd.
 290          */
 291         struct lttng_ht *ust_objd;
 292         /*
 293          * Hash table containing ust_app_session indexed by objd.
 294          */
 295         struct lttng_ht *ust_sessions_objd;
 296
 297         /*
 298          * If this application is of the agent domain and this is non negative then
 299          * a lookup MUST be done to acquire a read side reference to the
 300          * corresponding agent app object. If the lookup fails, this should be set
 301          * to a negative value indicating that the agent application is gone.
 302          */
 303         int agent_app_sock;
 304         /*
 305          * Time at which the app is registred.
 306          * Used for path creation
 307          */
 308         time_t registration_time;
 309         /*
 310          * Event notifier
 311          */
 312         struct {
 313                 /*
 314                  * Handle to the lttng_ust object representing the event
 315                  * notifier group.
 316                  */
 317                 struct lttng_ust_abi_object_data *object;
 318                 struct lttng_pipe *event_pipe;
 319                 struct lttng_ust_abi_object_data *counter;
 320                 struct lttng_ust_abi_object_data **counter_cpu;
 321                 int nr_counter_cpu;
 322         } event_notifier_group;
 323         /*
 324          * Hashtable indexing the application's event notifier rule's
 325          * (ust_app_event_notifier_rule) by their token's value.
 326          */
 327         struct lttng_ht *token_to_event_notifier_rule_ht;
 328
 329         lttng::sessiond::ust::ctl_field_quirks ctl_field_quirks() const;
 330 };
 331
 332 /*
 333  * Due to a bug in g++ < 7.1, this specialization must be enclosed in the fmt namespace,
 334  * see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56480.
 335  */
 336 namespace fmt {
 337 template <>
 338 struct formatter<ust_app> : formatter<std::string> {
 339         template <typename FormatContextType>
 340         typename FormatContextType::iterator format(const ust_app& app, FormatContextType& ctx)
 341         {
 342                 return format_to(ctx.out(),
 343                                 "{{ procname = `{}`, ppid = {}, pid = {}, uid = {}, gid = {}, version = {}.{}, registration time = {} }}",
 344                                 app.name, app.ppid, app.pid, app.uid, app.gid, app.v_major,
 345                                 app.v_minor,
 346                                 lttng::utils::time_to_iso8601_str(app.registration_time));
 347         }
 348 };
 349 } /* namespace fmt */
 350
 351 #ifdef HAVE_LIBLTTNG_UST_CTL
 352
 353 int ust_app_register(struct ust_register_msg *msg, int sock);
 354 int ust_app_register_done(struct ust_app *app);
 355 int ust_app_version(struct ust_app *app);
 356 void ust_app_unregister(int sock);
 357 int ust_app_start_trace_all(struct ltt_ust_session *usess);
 358 int ust_app_stop_trace_all(struct ltt_ust_session *usess);
 359 int ust_app_destroy_trace_all(struct ltt_ust_session *usess);
 360 int ust_app_list_events(struct lttng_event **events);
 361 int ust_app_list_event_fields(struct lttng_event_field **fields);
 362 int ust_app_create_event_glb(struct ltt_ust_session *usess,
 363                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
 364 int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
 365                 struct ltt_ust_channel *uchan);
 366 int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
 367                 struct ltt_ust_channel *uchan);
 368 int ust_app_enable_event_glb(struct ltt_ust_session *usess,
 369                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
 370 int ust_app_disable_event_glb(struct ltt_ust_session *usess,
 371                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
 372 int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
 373                 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx);
 374 void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app);
 375 void ust_app_global_update_all(struct ltt_ust_session *usess);
 376 void ust_app_global_update_event_notifier_rules(struct ust_app *app);
 377 void ust_app_global_update_all_event_notifier_rules();
 378
 379 void ust_app_clean_list();
 380 int ust_app_ht_alloc();
 381 struct ust_app *ust_app_find_by_pid(pid_t pid);
 382 struct ust_app_stream *ust_app_alloc_stream();
 383 int ust_app_recv_registration(int sock, struct ust_register_msg *msg);
 384 int ust_app_recv_notify(int sock);
 385 void ust_app_add(struct ust_app *app);
 386 struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock);
 387 void ust_app_notify_sock_unregister(int sock);
 388 ssize_t ust_app_push_metadata(const lttng::sessiond::ust::registry_session::locked_ptr& registry,
 389                 struct consumer_socket *socket,
 390                 int send_zero_data);
 391 void ust_app_destroy(struct ust_app *app);
 392 enum lttng_error_code ust_app_snapshot_record(
 393                 const struct ltt_ust_session *usess,
 394                 const struct consumer_output *output,
 395                 uint64_t nb_packets_per_stream);
 396 uint64_t ust_app_get_size_one_more_packet_per_stream(
 397                 const struct ltt_ust_session *usess, uint64_t cur_nr_packets);
 398 struct ust_app *ust_app_find_by_sock(int sock);
 399 int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id,
 400                 struct cds_list_head *buffer_reg_uid_list,
 401                 struct consumer_output *consumer, uint64_t uchan_id,
 402                 int overwrite, uint64_t *discarded, uint64_t *lost);
 403 int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess,
 404                 struct ltt_ust_channel *uchan,
 405                 struct consumer_output *consumer,
 406                 int overwrite, uint64_t *discarded, uint64_t *lost);
 407 int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess);
 408 enum lttng_error_code ust_app_rotate_session(struct ltt_session *session);
 409 enum lttng_error_code ust_app_create_channel_subdirectories(
 410                 const struct ltt_ust_session *session);
 411 int ust_app_release_object(struct ust_app *app,
 412                 struct lttng_ust_abi_object_data *data);
 413 enum lttng_error_code ust_app_clear_session(struct ltt_session *session);
 414 enum lttng_error_code ust_app_open_packets(struct ltt_session *session);
 415
 416 int ust_app_setup_event_notifier_group(struct ust_app *app);
 417
 418 static inline
 419 int ust_app_supported()
 420 {
 421         return 1;
 422 }
 423
 424 bool ust_app_supports_notifiers(const struct ust_app *app);
 425 bool ust_app_supports_counters(const struct ust_app *app);
 426
 427 #else /* HAVE_LIBLTTNG_UST_CTL */
 428
 429 static inline
 430 int ust_app_destroy_trace_all(
 431                 struct ltt_ust_session *usess __attribute__((unused)))
 432 {
 433         return 0;
 434 }
 435
 436 static inline
 437 int ust_app_start_trace(
 438                 struct ltt_ust_session *usess __attribute__((unused)),
 439                 struct ust_app *app __attribute__((unused)))
 440 {
 441         return 0;
 442 }
 443
 444 static inline
 445 int ust_app_start_trace_all(
 446                 struct ltt_ust_session *usess __attribute__((unused)))
 447 {
 448         return 0;
 449 }
 450
 451 static inline
 452 int ust_app_stop_trace_all(
 453                 struct ltt_ust_session *usess __attribute__((unused)))
 454 {
 455         return 0;
 456 }
 457
 458 static inline
 459 int ust_app_list_events(
 460                 struct lttng_event **events __attribute__((unused)))
 461 {
 462         return -ENOSYS;
 463 }
 464
 465 static inline
 466 int ust_app_list_event_fields(
 467                 struct lttng_event_field **fields __attribute__((unused)))
 468 {
 469         return -ENOSYS;
 470 }
 471
 472 static inline
 473 int ust_app_register(
 474                 struct ust_register_msg *msg __attribute__((unused)),
 475                 int sock __attribute__((unused)))
 476 {
 477         return -ENOSYS;
 478 }
 479
 480 static inline
 481 int ust_app_register_done(struct ust_app *app __attribute__((unused)))
 482 {
 483         return -ENOSYS;
 484 }
 485
 486 static inline
 487 int ust_app_version(struct ust_app *app __attribute__((unused)))
 488 {
 489         return -ENOSYS;
 490 }
 491
 492 static inline
 493 void ust_app_unregister(int sock __attribute__((unused)))
 494 {
 495 }
 496
 497 static inline
 498 void ust_app_clean_list(void)
 499 {
 500 }
 501
 502 static inline
 503 struct ust_app_list *ust_app_get_list(void)
 504 {
 505         return NULL;
 506 }
 507
 508 static inline
 509 struct ust_app *ust_app_get_by_pid(pid_t pid __attribute__((unused)))
 510 {
 511         return NULL;
 512 }
 513
 514 static inline
 515 int ust_app_ht_alloc(void)
 516 {
 517         return 0;
 518 }
 519
 520 static inline
 521 void ust_app_global_update(
 522                 struct ltt_ust_session *usess __attribute__((unused)),
 523                 struct ust_app *app __attribute__((unused)))
 524 {}
 525
 526 static inline
 527 void ust_app_global_update_event_notifier_rules(
 528                 struct ust_app *app __attribute__((unused)))
 529 {}
 530
 531 static inline
 532 void ust_app_global_update_all_event_notifier_rules(void)
 533 {}
 534
 535 static inline
 536 int ust_app_setup_event_notifier_group(
 537                 struct ust_app *app __attribute__((unused)))
 538 {
 539         return 0;
 540 }
 541
 542 static inline
 543 int ust_app_disable_channel_glb(
 544                 struct ltt_ust_session *usess __attribute__((unused)),
 545                 struct ltt_ust_channel *uchan __attribute__((unused)))
 546 {
 547         return 0;
 548 }
 549
 550 static inline
 551 int ust_app_enable_channel_glb(
 552                 struct ltt_ust_session *usess __attribute__((unused)),
 553                 struct ltt_ust_channel *uchan __attribute__((unused)))
 554 {
 555         return 0;
 556 }
 557
 558 static inline
 559 int ust_app_create_event_glb(
 560                 struct ltt_ust_session *usess __attribute__((unused)),
 561                 struct ltt_ust_channel *uchan __attribute__((unused)),
 562                 struct ltt_ust_event *uevent __attribute__((unused)))
 563 {
 564         return 0;
 565 }
 566
 567 static inline
 568 int ust_app_disable_event_glb(
 569                 struct ltt_ust_session *usess __attribute__((unused)),
 570                 struct ltt_ust_channel *uchan __attribute__((unused)),
 571                 struct ltt_ust_event *uevent __attribute__((unused)))
 572 {
 573         return 0;
 574 }
 575
 576 static inline
 577 int ust_app_enable_event_glb(
 578                 struct ltt_ust_session *usess __attribute__((unused)),
 579                 struct ltt_ust_channel *uchan __attribute__((unused)),
 580                 struct ltt_ust_event *uevent __attribute__((unused)))
 581 {
 582         return 0;
 583 }
 584
 585 static inline
 586 int ust_app_add_ctx_channel_glb(
 587                 struct ltt_ust_session *usess __attribute__((unused)),
 588                 struct ltt_ust_channel *uchan __attribute__((unused)),
 589                 struct ltt_ust_context *uctx __attribute__((unused)))
 590 {
 591         return 0;
 592 }
 593
 594 static inline
 595 int ust_app_enable_event_pid(
 596                 struct ltt_ust_session *usess __attribute__((unused)),
 597                 struct ltt_ust_channel *uchan __attribute__((unused)),
 598                 struct ltt_ust_event *uevent __attribute__((unused)),
 599                 pid_t pid __attribute__((unused)))
 600 {
 601         return 0;
 602 }
 603
 604 static inline
 605 int ust_app_recv_registration(
 606                 int sock __attribute__((unused)),
 607                 struct ust_register_msg *msg __attribute__((unused)))
 608 {
 609         return 0;
 610 }
 611
 612 static inline
 613 int ust_app_recv_notify(int sock __attribute__((unused)))
 614 {
 615         return 0;
 616 }
 617
 618 static inline
 619 struct ust_app *ust_app_create(
 620                 struct ust_register_msg *msg __attribute__((unused)),
 621                 int sock __attribute__((unused)))
 622 {
 623         return NULL;
 624 }
 625
 626 static inline
 627 void ust_app_add(struct ust_app *app __attribute__((unused)))
 628 {
 629 }
 630
 631 static inline
 632 void ust_app_notify_sock_unregister(int sock __attribute__((unused)))
 633 {
 634 }
 635
 636 static inline
 637 ssize_t ust_app_push_metadata(
 638                 lttng::sessiond::ust::registry_session *registry __attribute__((unused)),
 639                 struct consumer_socket *socket __attribute__((unused)),
 640                 int send_zero_data __attribute__((unused)))
 641 {
 642         return 0;
 643 }
 644
 645 static inline
 646 void ust_app_destroy(struct ust_app *app __attribute__((unused)))
 647 {
 648         return;
 649 }
 650
 651 static inline
 652 enum lttng_error_code ust_app_snapshot_record(
 653                 struct ltt_ust_session *usess __attribute__((unused)),
 654                 const struct consumer_output *output __attribute__((unused)),
 655                 uint64_t max_stream_size __attribute__((unused)))
 656 {
 657         return LTTNG_ERR_UNK;
 658 }
 659
 660 static inline
 661 unsigned int ust_app_get_nb_stream(
 662                 struct ltt_ust_session *usess __attribute__((unused)))
 663 {
 664         return 0;
 665 }
 666
 667 static inline
 668 void ust_app_update_event_notifier_error_count(
 669                 struct lttng_trigger *lttng_trigger __attribute__((unused)))
 670 {
 671         return;
 672 }
 673
 674 static inline
 675 int ust_app_supported(void)
 676 {
 677         return 0;
 678 }
 679
 680 static inline
 681 bool ust_app_supports_notifiers(
 682                 const struct ust_app *app __attribute__((unused)))
 683 {
 684         return false;
 685 }
 686
 687 static inline
 688 bool ust_app_supports_counters(
 689                 const struct ust_app *app __attribute__((unused)))
 690 {
 691         return false;
 692 }
 693
 694 static inline
 695 struct ust_app *ust_app_find_by_sock(int sock __attribute__((unused)))
 696 {
 697         return NULL;
 698 }
 699
 700 static inline
 701 struct ust_app *ust_app_find_by_pid(pid_t pid __attribute__((unused)))
 702 {
 703         return NULL;
 704 }
 705
 706 static inline
 707 uint64_t ust_app_get_size_one_more_packet_per_stream(
 708                 const struct ltt_ust_session *usess __attribute__((unused)),
 709                 uint64_t cur_nr_packets __attribute__((unused))) {
 710         return 0;
 711 }
 712
 713 static inline
 714 int ust_app_uid_get_channel_runtime_stats(
 715                 uint64_t ust_session_id __attribute__((unused)),
 716                 struct cds_list_head *buffer_reg_uid_list __attribute__((unused)),
 717                 struct consumer_output *consumer __attribute__((unused)),
 718                 int overwrite __attribute__((unused)),
 719                 uint64_t uchan_id __attribute__((unused)),
 720                 uint64_t *discarded __attribute__((unused)),
 721                 uint64_t *lost __attribute__((unused)))
 722 {
 723         return 0;
 724 }
 725
 726 static inline
 727 int ust_app_pid_get_channel_runtime_stats(
 728                 struct ltt_ust_session *usess __attribute__((unused)),
 729                 struct ltt_ust_channel *uchan __attribute__((unused)),
 730                 struct consumer_output *consumer __attribute__((unused)),
 731                 int overwrite __attribute__((unused)),
 732                 uint64_t *discarded __attribute__((unused)),
 733                 uint64_t *lost __attribute__((unused)))
 734 {
 735         return 0;
 736 }
 737
 738 static inline
 739 int ust_app_regenerate_statedump_all(
 740                 struct ltt_ust_session *usess __attribute__((unused)))
 741 {
 742         return 0;
 743 }
 744
 745 static inline
 746 enum lttng_error_code ust_app_rotate_session(
 747                 struct ltt_session *session __attribute__((unused)))
 748 {
 749         return LTTNG_ERR_UNK;
 750 }
 751
 752 static inline
 753 enum lttng_error_code ust_app_create_channel_subdirectories(
 754                 const struct ltt_ust_session *session __attribute__((unused)))
 755 {
 756         return LTTNG_ERR_UNK;
 757 }
 758
 759 static inline
 760 int ust_app_release_object(struct ust_app *app __attribute__((unused)),
 761                 struct lttng_ust_abi_object_data *data __attribute__((unused)))
 762 {
 763         return 0;
 764 }
 765
 766 static inline
 767 enum lttng_error_code ust_app_clear_session(
 768                 struct ltt_session *session __attribute__((unused)))
 769 {
 770         return LTTNG_ERR_UNK;
 771 }
 772
 773 static inline
 774 enum lttng_error_code ust_app_open_packets(
 775                 struct ltt_session *session __attribute__((unused)))
 776 {
 777         return LTTNG_ERR_UNK;
 778 }
 779
 780 #endif /* HAVE_LIBLTTNG_UST_CTL */
 781
 782 #endif /* _LTT_UST_APP_H */