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