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