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 "trace-class.hpp"
  13 #include "trace-ust.hpp"
  14 #include "ust-field-quirks.hpp"
  15
  16 #include <common/format.hpp>
  17 #include <common/index-allocator.hpp>
  18 #include <common/reference.hpp>
  19 #include <common/scope-exit.hpp>
  20 #include <common/uuid.hpp>
  21
  22 #include <list>
  23 #include <stdint.h>
  24
  25 #define UST_APP_EVENT_LIST_SIZE 32
  26
  27 /* Process name (short). */
  28 #define UST_APP_PROCNAME_LEN 16
  29
  30 struct lttng_bytecode;
  31 struct lttng_ust_filter_bytecode;
  32
  33 namespace lttng {
  34 namespace sessiond {
  35 namespace ust {
  36 class registry_session;
  37 } /* namespace ust */
  38 } /* namespace sessiond */
  39 } /* namespace lttng */
  40
  41 extern int the_ust_consumerd64_fd, the_ust_consumerd32_fd;
  42
  43 /*
  44  * Object used to close the notify socket in a call_rcu(). Since the
  45  * application might not be found, we need an independant object containing the
  46  * notify socket fd.
  47  */
  48 struct ust_app_notify_sock_obj {
  49         int fd;
  50         struct rcu_head head;
  51 };
  52
  53 struct ust_app_ht_key {
  54         const char *name;
  55         const struct lttng_bytecode *filter;
  56         enum lttng_ust_abi_loglevel_type loglevel_type;
  57         int loglevel_value;
  58         const struct lttng_event_exclusion *exclusion;
  59 };
  60
  61 /*
  62  * Application registration data structure.
  63  */
  64 struct ust_register_msg {
  65         enum lttng_ust_ctl_socket_type type;
  66         uint32_t major;
  67         uint32_t minor;
  68         uint32_t abi_major;
  69         uint32_t abi_minor;
  70         pid_t pid;
  71         pid_t ppid;
  72         uid_t uid;
  73         gid_t gid;
  74         uint32_t bits_per_long;
  75         uint32_t uint8_t_alignment;
  76         uint32_t uint16_t_alignment;
  77         uint32_t uint32_t_alignment;
  78         uint32_t uint64_t_alignment;
  79         uint32_t long_alignment;
  80         int byte_order; /* BIG_ENDIAN or LITTLE_ENDIAN */
  81         char name[LTTNG_UST_ABI_PROCNAME_LEN];
  82 };
  83
  84 /*
  85  * Global applications HT used by the session daemon. This table is indexed by
  86  * PID using the pid_n node and pid value of an ust_app.
  87  */
  88 extern struct lttng_ht *ust_app_ht;
  89
  90 /*
  91  * Global applications HT used by the session daemon. This table is indexed by
  92  * socket using the sock_n node and sock value of an ust_app.
  93  *
  94  * The 'sock' in question here is the 'command' socket.
  95  */
  96 extern struct lttng_ht *ust_app_ht_by_sock;
  97
  98 /*
  99  * Global applications HT used by the session daemon. This table is indexed by
 100  * socket using the notify_sock_n node and notify_sock value of an ust_app.
 101  */
 102 extern struct lttng_ht *ust_app_ht_by_notify_sock;
 103
 104 /* Stream list containing ust_app_stream. */
 105 struct ust_app_stream_list {
 106         unsigned int count;
 107         struct cds_list_head head;
 108 };
 109
 110 struct ust_app_ctx {
 111         int handle;
 112         struct lttng_ust_context_attr ctx;
 113         struct lttng_ust_abi_object_data *obj;
 114         struct lttng_ht_node_ulong node;
 115         struct cds_list_head list;
 116 };
 117
 118 struct ust_app_event {
 119         bool enabled;
 120         int handle;
 121         struct lttng_ust_abi_object_data *obj;
 122         struct lttng_ust_abi_event attr;
 123         char name[LTTNG_UST_ABI_SYM_NAME_LEN];
 124         struct lttng_ht_node_str node;
 125         struct lttng_bytecode *filter;
 126         struct lttng_event_exclusion *exclusion;
 127 };
 128
 129 struct ust_app_event_notifier_rule {
 130         bool enabled;
 131         uint64_t error_counter_index;
 132         int handle;
 133         struct lttng_ust_abi_object_data *obj;
 134         /* Holds a strong reference. */
 135         struct lttng_trigger *trigger;
 136         /* Unique ID returned by the tracer to identify this event notifier. */
 137         uint64_t token;
 138         struct lttng_ht_node_u64 node;
 139         /* The trigger object owns the filter. */
 140         const struct lttng_bytecode *filter;
 141         /* Owned by this. */
 142         struct lttng_event_exclusion *exclusion;
 143         /* For delayed reclaim. */
 144         struct rcu_head rcu_head;
 145 };
 146
 147 struct ust_app_stream {
 148         int handle;
 149         char pathname[PATH_MAX];
 150         /* Format is %s_%d respectively channel name and CPU number. */
 151         char name[DEFAULT_STREAM_NAME_LEN];
 152         struct lttng_ust_abi_object_data *obj;
 153         /* Using a list of streams to keep order. */
 154         struct cds_list_head list;
 155 };
 156
 157 struct ust_app_channel {
 158         bool enabled;
 159         int handle;
 160         /*
 161          * Unique key used to identify the channel on the consumer side.
 162          * 0 is a reserved 'invalid' value used to indicate that the consumer
 163          * does not know about this channel (i.e. an error occurred).
 164          */
 165         uint64_t key;
 166         /* Id of the tracing channel set on creation. */
 167         uint64_t tracing_channel_id;
 168         /* Number of stream that this channel is expected to receive. */
 169         unsigned int expected_stream_count;
 170         char name[LTTNG_UST_ABI_SYM_NAME_LEN];
 171         struct lttng_ust_abi_object_data *obj;
 172         struct lttng_ust_ctl_consumer_channel_attr attr;
 173         struct ust_app_stream_list streams;
 174         /* Session pointer that owns this object. */
 175         struct ust_app_session *session;
 176         /*
 177          * Contexts are kept in a hash table for fast lookup and in an ordered list
 178          * so we are able to enable them on the tracer side in the same order the
 179          * user added them.
 180          */
 181         struct lttng_ht *ctx;
 182         struct cds_list_head ctx_list;
 183
 184         struct lttng_ht *events;
 185         uint64_t tracefile_size;
 186         uint64_t tracefile_count;
 187         uint64_t monitor_timer_interval;
 188         /*
 189          * Node indexed by channel name in the channels' hash table of a session.
 190          */
 191         struct lttng_ht_node_str node;
 192         /*
 193          * Node indexed by UST channel object descriptor (handle). Stored in the
 194          * ust_objd hash table in the ust_app object.
 195          */
 196         struct lttng_ht_node_ulong ust_objd_node;
 197         /* For delayed reclaim */
 198         struct rcu_head rcu_head;
 199 };
 200
 201 struct ust_app_session {
 202 private:
 203         static void _session_unlock(ust_app_session *session)
 204         {
 205                 _const_session_unlock(session);
 206         }
 207
 208         static void _const_session_unlock(const ust_app_session *session)
 209         {
 210                 pthread_mutex_unlock(&session->_lock);
 211         }
 212
 213 public:
 214         using locked_weak_ref = lttng::non_copyable_reference<
 215                 ust_app_session,
 216                 lttng::memory::create_deleter_class<ust_app_session,
 217                                                     ust_app_session::_session_unlock>::deleter>;
 218         using const_locked_weak_ref = lttng::non_copyable_reference<
 219                 const ust_app_session,
 220                 lttng::memory::create_deleter_class<const ust_app_session,
 221                                                     ust_app_session::_const_session_unlock>::deleter>;
 222
 223         static locked_weak_ref make_locked_weak_ref(ust_app_session& ua_session)
 224         {
 225                 return lttng::make_non_copyable_reference<locked_weak_ref::referenced_type,
 226                                                           locked_weak_ref::deleter>(ua_session);
 227         }
 228
 229         static const_locked_weak_ref make_locked_weak_ref(const ust_app_session& ua_session)
 230         {
 231                 return lttng::make_non_copyable_reference<const_locked_weak_ref::referenced_type,
 232                                                           const_locked_weak_ref::deleter>(
 233                         ua_session);
 234         }
 235
 236         ust_app_session::const_locked_weak_ref lock() const noexcept
 237         {
 238                 pthread_mutex_lock(&_lock);
 239                 return ust_app_session::make_locked_weak_ref(*this);
 240         }
 241
 242         ust_app_session::locked_weak_ref lock() noexcept
 243         {
 244                 pthread_mutex_lock(&_lock);
 245                 return ust_app_session::make_locked_weak_ref(*this);
 246         }
 247
 248         struct identifier {
 249                 enum class application_abi : std::uint8_t { ABI_32 = 32, ABI_64 = 64 };
 250                 enum class buffer_allocation_policy : std::uint8_t { PER_PID, PER_UID };
 251
 252                 /* Unique identifier of the ust_app_session. */
 253                 std::uint64_t id;
 254                 /* Unique identifier of the ltt_session. */
 255                 std::uint64_t session_id;
 256                 /* Credentials of the application which owns the ust_app_session. */
 257                 lttng_credentials app_credentials;
 258                 application_abi abi;
 259                 buffer_allocation_policy allocation_policy;
 260         };
 261
 262         identifier get_identifier() const noexcept
 263         {
 264                 /*
 265                  * To work around synchro design issues, this method allows the sampling
 266                  * of a ust_app_session's identifying properties without taking its lock.
 267                  *
 268                  * Since those properties are immutable, it is safe to sample them without
 269                  * holding the lock (as long as the existence of the instance is somehow
 270                  * guaranteed).
 271                  *
 272                  * The locking issue that motivates this method is that the application
 273                  * notitication handling thread needs to access the registry_session in response to
 274                  * a message from the application. The ust_app_session's ID is needed to look-up the
 275                  * registry session.
 276                  *
 277                  * The application's message can be emited in response to a command from the
 278                  * session daemon that is emited by the client thread.
 279                  *
 280                  * During that command, the client thread holds the ust_app_session lock until
 281                  * the application replies to the command. This causes the notification thread
 282                  * to block when it attempts to sample the ust_app_session's ID properties.
 283                  */
 284                 LTTNG_ASSERT(bits_per_long == 32 || bits_per_long == 64);
 285                 LTTNG_ASSERT(buffer_type == LTTNG_BUFFER_PER_PID ||
 286                              buffer_type == LTTNG_BUFFER_PER_UID);
 287
 288                 return { .id = id,
 289                          .session_id = tracing_id,
 290                          .app_credentials = real_credentials,
 291                          .abi = bits_per_long == 32 ? identifier::application_abi::ABI_32 :
 292                                                       identifier::application_abi::ABI_64,
 293                          .allocation_policy = buffer_type == LTTNG_BUFFER_PER_PID ?
 294                                  identifier::buffer_allocation_policy::PER_PID :
 295                                  identifier::buffer_allocation_policy::PER_UID };
 296         }
 297
 298         bool enabled = false;
 299         /* started: has the session been in started state at any time ? */
 300         bool started = false; /* allows detection of start vs restart. */
 301         int handle = 0; /* used has unique identifier for app session */
 302
 303         bool deleted = false; /* Session deleted flag. Check with lock held. */
 304
 305         /*
 306          * Tracing session ID. Multiple ust app session can have the same tracing
 307          * session id making this value NOT unique to the object.
 308          */
 309         uint64_t tracing_id = 0;
 310         uint64_t id = 0; /* Unique session identifier */
 311         struct lttng_ht *channels = nullptr; /* Registered channels */
 312         struct lttng_ht_node_u64 node = {};
 313         /*
 314          * Node indexed by UST session object descriptor (handle). Stored in the
 315          * ust_sessions_objd hash table in the ust_app object.
 316          */
 317         struct lttng_ht_node_ulong ust_objd_node = {};
 318         /* Starts with 'ust'; no leading slash. */
 319         char path[PATH_MAX] = {};
 320         /* UID/GID of the application owning the session */
 321         struct lttng_credentials real_credentials = {};
 322         /* Effective UID and GID. Same as the tracing session. */
 323         struct lttng_credentials effective_credentials = {};
 324         /*
 325          * Once at least *one* session is created onto the application, the
 326          * corresponding consumer is set so we can use it on unregistration.
 327          */
 328         struct consumer_output *consumer = nullptr;
 329         enum lttng_buffer_type buffer_type = LTTNG_BUFFER_PER_PID;
 330         /* ABI of the session. Same value as the application. */
 331         uint32_t bits_per_long = 0;
 332         /* For delayed reclaim */
 333         struct rcu_head rcu_head = {};
 334         /* If the channel's streams have to be outputed or not. */
 335         unsigned int output_traces = 0;
 336         unsigned int live_timer_interval = 0; /* usec */
 337
 338         /* Metadata channel attributes. */
 339         struct lttng_ust_ctl_consumer_channel_attr metadata_attr = {};
 340
 341         char root_shm_path[PATH_MAX] = {};
 342         char shm_path[PATH_MAX] = {};
 343
 344 private:
 345         /*
 346          * Lock protecting this session's ust app interaction. Held
 347          * across command send/recv to/from app. Never nests within the
 348          * session registry lock.
 349          */
 350         mutable pthread_mutex_t _lock = PTHREAD_MUTEX_INITIALIZER;
 351 };
 352
 353 /*
 354  * Registered traceable applications. Libust registers to the session daemon
 355  * and a linked list is kept of all running traceable app.
 356  */
 357 struct ust_app {
 358         /*
 359          * The lifetime of 'sock' holds a reference to the application; the
 360          * application management thread will release a reference to the
 361          * application if the application dies.
 362          */
 363         urcu_ref ref;
 364
 365         /* Traffic initiated from the session daemon to the application. */
 366         int sock;
 367         pthread_mutex_t sock_lock; /* Protects sock protocol. */
 368
 369         /* Traffic initiated from the application to the session daemon. */
 370         int notify_sock;
 371         pid_t pid;
 372         pid_t ppid;
 373         uid_t uid; /* User ID that owns the apps */
 374         gid_t gid; /* Group ID that owns the apps */
 375
 376         /* App ABI. */
 377         lttng::sessiond::trace::abi abi;
 378
 379         int compatible; /* If the lttng-ust tracer version does not match the
 380                                            supported version of the session daemon, this flag is
 381                                            set to 0 (NOT compatible) else 1. */
 382         struct lttng_ust_abi_tracer_version version;
 383         uint32_t v_major; /* Version major number */
 384         uint32_t v_minor; /* Version minor number */
 385         /* Extra for the NULL byte. */
 386         char name[UST_APP_PROCNAME_LEN + 1];
 387
 388         struct lttng_ht *sessions;
 389         struct lttng_ht_node_ulong pid_n;
 390         struct lttng_ht_node_ulong sock_n;
 391         struct lttng_ht_node_ulong notify_sock_n;
 392         /*
 393          * This is a list of ust app session that, once the app is going into
 394          * teardown mode, in the RCU call, each node in this list is removed and
 395          * deleted.
 396          *
 397          * Element of the list are added when an application unregisters after each
 398          * ht_del of ust_app_session associated to this app. This list is NOT used
 399          * when a session is destroyed.
 400          */
 401         std::list<ust_app_session *> sessions_to_teardown;
 402         /*
 403          * Hash table containing ust_app_channel indexed by channel objd.
 404          */
 405         struct lttng_ht *ust_objd;
 406         /*
 407          * Hash table containing ust_app_session indexed by objd.
 408          */
 409         struct lttng_ht *ust_sessions_objd;
 410
 411         /*
 412          * If this application is of the agent domain and this is non negative then
 413          * a lookup MUST be done to acquire a read side reference to the
 414          * corresponding agent app object. If the lookup fails, this should be set
 415          * to a negative value indicating that the agent application is gone.
 416          */
 417         int agent_app_sock;
 418         /*
 419          * Time at which the app is registred.
 420          * Used for path creation
 421          */
 422         time_t registration_time;
 423         /*
 424          * Event notifier
 425          */
 426         struct {
 427                 /*
 428                  * Handle to the lttng_ust object representing the event
 429                  * notifier group.
 430                  */
 431                 struct lttng_ust_abi_object_data *object;
 432                 struct lttng_pipe *event_pipe;
 433                 struct lttng_ust_abi_object_data *counter;
 434                 struct lttng_ust_abi_object_data **counter_cpu;
 435                 int nr_counter_cpu;
 436         } event_notifier_group;
 437         /*
 438          * Hashtable indexing the application's event notifier rule's
 439          * (ust_app_event_notifier_rule) by their token's value.
 440          */
 441         struct lttng_ht *token_to_event_notifier_rule_ht;
 442
 443         lttng::sessiond::ust::ctl_field_quirks ctl_field_quirks() const;
 444 };
 445
 446 /*
 447  * Due to a bug in g++ < 7.1, this specialization must be enclosed in the fmt namespace,
 448  * see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56480.
 449  */
 450 namespace fmt {
 451 template <>
 452 struct formatter<ust_app> : formatter<std::string> {
 453         template <typename FormatContextType>
 454         typename FormatContextType::iterator format(const ust_app& app,
 455                                                     FormatContextType& ctx) const
 456         {
 457                 return format_to(
 458                         ctx.out(),
 459                         "{{ procname = `{}`, ppid = {}, pid = {}, uid = {}, gid = {}, version = {}.{}, registration time = {} }}",
 460                         app.name,
 461                         app.ppid,
 462                         app.pid,
 463                         app.uid,
 464                         app.gid,
 465                         app.v_major,
 466                         app.v_minor,
 467                         lttng::utils::time_to_iso8601_str(app.registration_time));
 468         }
 469 };
 470 } /* namespace fmt */
 471
 472 #ifdef HAVE_LIBLTTNG_UST_CTL
 473
 474 int ust_app_register(struct ust_register_msg *msg, int sock);
 475 int ust_app_register_done(struct ust_app *app);
 476 int ust_app_version(struct ust_app *app);
 477 void ust_app_unregister_by_socket(int sock);
 478 int ust_app_start_trace_all(struct ltt_ust_session *usess);
 479 int ust_app_stop_trace_all(struct ltt_ust_session *usess);
 480 int ust_app_destroy_trace_all(struct ltt_ust_session *usess);
 481 int ust_app_list_events(struct lttng_event **events);
 482 int ust_app_list_event_fields(struct lttng_event_field **fields);
 483 int ust_app_create_event_glb(struct ltt_ust_session *usess,
 484                              struct ltt_ust_channel *uchan,
 485                              struct ltt_ust_event *uevent);
 486 int ust_app_disable_channel_glb(struct ltt_ust_session *usess, struct ltt_ust_channel *uchan);
 487 int ust_app_enable_channel_glb(struct ltt_ust_session *usess, struct ltt_ust_channel *uchan);
 488 int ust_app_enable_event_glb(struct ltt_ust_session *usess,
 489                              struct ltt_ust_channel *uchan,
 490                              struct ltt_ust_event *uevent);
 491 int ust_app_disable_event_glb(struct ltt_ust_session *usess,
 492                               struct ltt_ust_channel *uchan,
 493                               struct ltt_ust_event *uevent);
 494 int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
 495                                 struct ltt_ust_channel *uchan,
 496                                 struct ltt_ust_context *uctx);
 497 void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app);
 498 void ust_app_global_update_all(struct ltt_ust_session *usess);
 499 void ust_app_global_update_event_notifier_rules(struct ust_app *app);
 500 void ust_app_global_update_all_event_notifier_rules();
 501
 502 void ust_app_clean_list();
 503 int ust_app_ht_alloc();
 504 struct ust_app *ust_app_find_by_pid(pid_t pid);
 505 struct ust_app_stream *ust_app_alloc_stream();
 506 int ust_app_recv_registration(int sock, struct ust_register_msg *msg);
 507 int ust_app_recv_notify(int sock);
 508 void ust_app_add(struct ust_app *app);
 509 struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock);
 510 void ust_app_notify_sock_unregister(int sock);
 511
 512 enum lttng_error_code ust_app_snapshot_record(const struct ltt_ust_session *usess,
 513                                               const struct consumer_output *output,
 514                                               uint64_t nb_packets_per_stream);
 515 uint64_t ust_app_get_size_one_more_packet_per_stream(const struct ltt_ust_session *usess,
 516                                                      uint64_t cur_nr_packets);
 517 struct ust_app *ust_app_find_by_sock(int sock);
 518 int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id,
 519                                           struct cds_list_head *buffer_reg_uid_list,
 520                                           struct consumer_output *consumer,
 521                                           uint64_t uchan_id,
 522                                           int overwrite,
 523                                           uint64_t *discarded,
 524                                           uint64_t *lost);
 525 int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess,
 526                                           struct ltt_ust_channel *uchan,
 527                                           struct consumer_output *consumer,
 528                                           int overwrite,
 529                                           uint64_t *discarded,
 530                                           uint64_t *lost);
 531 int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess);
 532 enum lttng_error_code ust_app_create_channel_subdirectories(const struct ltt_ust_session *session);
 533 int ust_app_release_object(struct ust_app *app, struct lttng_ust_abi_object_data *data);
 534
 535 int ust_app_setup_event_notifier_group(struct ust_app *app);
 536
 537 static inline int ust_app_supported()
 538 {
 539         return 1;
 540 }
 541
 542 ust_app_session *ust_app_lookup_app_session(const struct ltt_ust_session *usess,
 543                                             const struct ust_app *app);
 544 lttng::sessiond::ust::registry_session *
 545 ust_app_get_session_registry(const ust_app_session::identifier& identifier);
 546
 547 lttng_ht *ust_app_get_all();
 548
 549 bool ust_app_supports_notifiers(const struct ust_app *app);
 550 bool ust_app_supports_counters(const struct ust_app *app);
 551
 552 bool ust_app_get(ust_app& app);
 553 void ust_app_put(ust_app *app);
 554
 555 using ust_app_reference =
 556         std::unique_ptr<ust_app, lttng::memory::create_deleter_class<ust_app, ust_app_put>::deleter>;
 557
 558 #else /* HAVE_LIBLTTNG_UST_CTL */
 559
 560 static inline int ust_app_destroy_trace_all(struct ltt_ust_session *usess __attribute__((unused)))
 561 {
 562         return 0;
 563 }
 564
 565 static inline int ust_app_start_trace(struct ltt_ust_session *usess __attribute__((unused)),
 566                                       struct ust_app *app __attribute__((unused)))
 567 {
 568         return 0;
 569 }
 570
 571 static inline int ust_app_start_trace_all(struct ltt_ust_session *usess __attribute__((unused)))
 572 {
 573         return 0;
 574 }
 575
 576 static inline int ust_app_stop_trace_all(struct ltt_ust_session *usess __attribute__((unused)))
 577 {
 578         return 0;
 579 }
 580
 581 static inline int ust_app_list_events(struct lttng_event **events __attribute__((unused)))
 582 {
 583         return -ENOSYS;
 584 }
 585
 586 static inline int ust_app_list_event_fields(struct lttng_event_field **fields
 587                                             __attribute__((unused)))
 588 {
 589         return -ENOSYS;
 590 }
 591
 592 static inline int ust_app_register(struct ust_register_msg *msg __attribute__((unused)),
 593                                    int sock __attribute__((unused)))
 594 {
 595         return -ENOSYS;
 596 }
 597
 598 static inline int ust_app_register_done(struct ust_app *app __attribute__((unused)))
 599 {
 600         return -ENOSYS;
 601 }
 602
 603 static inline int ust_app_version(struct ust_app *app __attribute__((unused)))
 604 {
 605         return -ENOSYS;
 606 }
 607
 608 static inline void ust_app_unregister_by_socket(int sock __attribute__((unused)))
 609 {
 610 }
 611
 612 static inline void ust_app_clean_list(void)
 613 {
 614 }
 615
 616 static inline struct ust_app_list *ust_app_get_list(void)
 617 {
 618         return NULL;
 619 }
 620
 621 static inline struct ust_app *ust_app_get_by_pid(pid_t pid __attribute__((unused)))
 622 {
 623         return NULL;
 624 }
 625
 626 static inline int ust_app_ht_alloc(void)
 627 {
 628         return 0;
 629 }
 630
 631 static inline void ust_app_global_update(struct ltt_ust_session *usess __attribute__((unused)),
 632                                          struct ust_app *app __attribute__((unused)))
 633 {
 634 }
 635
 636 static inline void ust_app_global_update_event_notifier_rules(struct ust_app *app
 637                                                               __attribute__((unused)))
 638 {
 639 }
 640
 641 static inline void ust_app_global_update_all_event_notifier_rules(void)
 642 {
 643 }
 644
 645 static inline int ust_app_setup_event_notifier_group(struct ust_app *app __attribute__((unused)))
 646 {
 647         return 0;
 648 }
 649
 650 static inline int ust_app_disable_channel_glb(struct ltt_ust_session *usess __attribute__((unused)),
 651                                               struct ltt_ust_channel *uchan __attribute__((unused)))
 652 {
 653         return 0;
 654 }
 655
 656 static inline int ust_app_enable_channel_glb(struct ltt_ust_session *usess __attribute__((unused)),
 657                                              struct ltt_ust_channel *uchan __attribute__((unused)))
 658 {
 659         return 0;
 660 }
 661
 662 static inline int ust_app_create_event_glb(struct ltt_ust_session *usess __attribute__((unused)),
 663                                            struct ltt_ust_channel *uchan __attribute__((unused)),
 664                                            struct ltt_ust_event *uevent __attribute__((unused)))
 665 {
 666         return 0;
 667 }
 668
 669 static inline int ust_app_disable_event_glb(struct ltt_ust_session *usess __attribute__((unused)),
 670                                             struct ltt_ust_channel *uchan __attribute__((unused)),
 671                                             struct ltt_ust_event *uevent __attribute__((unused)))
 672 {
 673         return 0;
 674 }
 675
 676 static inline int ust_app_enable_event_glb(struct ltt_ust_session *usess __attribute__((unused)),
 677                                            struct ltt_ust_channel *uchan __attribute__((unused)),
 678                                            struct ltt_ust_event *uevent __attribute__((unused)))
 679 {
 680         return 0;
 681 }
 682
 683 static inline int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess __attribute__((unused)),
 684                                               struct ltt_ust_channel *uchan __attribute__((unused)),
 685                                               struct ltt_ust_context *uctx __attribute__((unused)))
 686 {
 687         return 0;
 688 }
 689
 690 static inline int ust_app_enable_event_pid(struct ltt_ust_session *usess __attribute__((unused)),
 691                                            struct ltt_ust_channel *uchan __attribute__((unused)),
 692                                            struct ltt_ust_event *uevent __attribute__((unused)),
 693                                            pid_t pid __attribute__((unused)))
 694 {
 695         return 0;
 696 }
 697
 698 static inline int ust_app_recv_registration(int sock __attribute__((unused)),
 699                                             struct ust_register_msg *msg __attribute__((unused)))
 700 {
 701         return 0;
 702 }
 703
 704 static inline int ust_app_recv_notify(int sock __attribute__((unused)))
 705 {
 706         return 0;
 707 }
 708
 709 static inline struct ust_app *ust_app_create(struct ust_register_msg *msg __attribute__((unused)),
 710                                              int sock __attribute__((unused)))
 711 {
 712         return NULL;
 713 }
 714
 715 static inline void ust_app_add(struct ust_app *app __attribute__((unused)))
 716 {
 717 }
 718
 719 static inline void ust_app_notify_sock_unregister(int sock __attribute__((unused)))
 720 {
 721 }
 722
 723 static inline enum lttng_error_code
 724 ust_app_snapshot_record(struct ltt_ust_session *usess __attribute__((unused)),
 725                         const struct consumer_output *output __attribute__((unused)),
 726                         uint64_t max_stream_size __attribute__((unused)))
 727 {
 728         return LTTNG_ERR_UNK;
 729 }
 730
 731 static inline unsigned int ust_app_get_nb_stream(struct ltt_ust_session *usess
 732                                                  __attribute__((unused)))
 733 {
 734         return 0;
 735 }
 736
 737 static inline void ust_app_update_event_notifier_error_count(struct lttng_trigger *lttng_trigger
 738                                                              __attribute__((unused)))
 739 {
 740         return;
 741 }
 742
 743 static inline int ust_app_supported(void)
 744 {
 745         return 0;
 746 }
 747
 748 static inline bool ust_app_supports_notifiers(const struct ust_app *app __attribute__((unused)))
 749 {
 750         return false;
 751 }
 752
 753 static inline bool ust_app_supports_counters(const struct ust_app *app __attribute__((unused)))
 754 {
 755         return false;
 756 }
 757
 758 static inline struct ust_app *ust_app_find_by_sock(int sock __attribute__((unused)))
 759 {
 760         return NULL;
 761 }
 762
 763 static inline struct ust_app *ust_app_find_by_pid(pid_t pid __attribute__((unused)))
 764 {
 765         return NULL;
 766 }
 767
 768 static inline uint64_t
 769 ust_app_get_size_one_more_packet_per_stream(const struct ltt_ust_session *usess
 770                                             __attribute__((unused)),
 771                                             uint64_t cur_nr_packets __attribute__((unused)))
 772 {
 773         return 0;
 774 }
 775
 776 static inline int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id
 777                                                         __attribute__((unused)),
 778                                                         struct cds_list_head *buffer_reg_uid_list
 779                                                         __attribute__((unused)),
 780                                                         struct consumer_output *consumer
 781                                                         __attribute__((unused)),
 782                                                         int overwrite __attribute__((unused)),
 783                                                         uint64_t uchan_id __attribute__((unused)),
 784                                                         uint64_t *discarded __attribute__((unused)),
 785                                                         uint64_t *lost __attribute__((unused)))
 786 {
 787         return 0;
 788 }
 789
 790 static inline int
 791 ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess __attribute__((unused)),
 792                                       struct ltt_ust_channel *uchan __attribute__((unused)),
 793                                       struct consumer_output *consumer __attribute__((unused)),
 794                                       int overwrite __attribute__((unused)),
 795                                       uint64_t *discarded __attribute__((unused)),
 796                                       uint64_t *lost __attribute__((unused)))
 797 {
 798         return 0;
 799 }
 800
 801 static inline int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess
 802                                                    __attribute__((unused)))
 803 {
 804         return 0;
 805 }
 806
 807 static inline enum lttng_error_code
 808 ust_app_create_channel_subdirectories(const struct ltt_ust_session *session __attribute__((unused)))
 809 {
 810         return LTTNG_ERR_UNK;
 811 }
 812
 813 static inline ust_app_session *ust_app_lookup_app_session(const ltt_ust_session *, const ust_app *)
 814 {
 815         return nullptr;
 816 }
 817
 818 static inline lttng::sessiond::ust::registry_session *
 819 ust_app_get_session_registry(const ust_app_session::identifier&)
 820 {
 821         return nullptr;
 822 }
 823
 824 static inline lttng_ht *ust_app_get_all()
 825 {
 826         return nullptr;
 827 }
 828
 829 static inline int ust_app_release_object(struct ust_app *app __attribute__((unused)),
 830                                          struct lttng_ust_abi_object_data *data
 831                                          __attribute__((unused)))
 832 {
 833         return 0;
 834 }
 835
 836 static inline void ust_app_get(ust_app& app __attribute__((unused)))
 837 {
 838 }
 839
 840 static inline void ust_app_put(ust_app *app __attribute__((unused)))
 841 {
 842 }
 843
 844 #endif /* HAVE_LIBLTTNG_UST_CTL */
 845
 846 #endif /* _LTT_UST_APP_H */