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 <stdint.h>
  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 namespace lttng {
  33 namespace sessiond {
  34 namespace ust {
  35 class registry_session;
  36 } /* namespace ust */
  37 } /* namespace sessiond */
  38 } /* namespace lttng */
  39
  40 extern int the_ust_consumerd64_fd, the_ust_consumerd32_fd;
  41
  42 /*
  43  * Object used to close the notify socket in a call_rcu(). Since the
  44  * application might not be found, we need an independant object containing the
  45  * notify socket fd.
  46  */
  47 struct ust_app_notify_sock_obj {
  48         int fd;
  49         struct rcu_head head;
  50 };
  51
  52 struct ust_app_ht_key {
  53         const char *name;
  54         const struct lttng_bytecode *filter;
  55         enum lttng_ust_abi_loglevel_type loglevel_type;
  56         int loglevel_value;
  57         const struct lttng_event_exclusion *exclusion;
  58 };
  59
  60 /*
  61  * Application registration data structure.
  62  */
  63 struct ust_register_msg {
  64         enum lttng_ust_ctl_socket_type type;
  65         uint32_t major;
  66         uint32_t minor;
  67         uint32_t abi_major;
  68         uint32_t abi_minor;
  69         pid_t pid;
  70         pid_t ppid;
  71         uid_t uid;
  72         gid_t gid;
  73         uint32_t bits_per_long;
  74         uint32_t uint8_t_alignment;
  75         uint32_t uint16_t_alignment;
  76         uint32_t uint32_t_alignment;
  77         uint32_t uint64_t_alignment;
  78         uint32_t long_alignment;
  79         int byte_order; /* BIG_ENDIAN or LITTLE_ENDIAN */
  80         char name[LTTNG_UST_ABI_PROCNAME_LEN];
  81 };
  82
  83 /*
  84  * Global applications HT used by the session daemon. This table is indexed by
  85  * PID using the pid_n node and pid value of an ust_app.
  86  */
  87 extern struct lttng_ht *ust_app_ht;
  88
  89 /*
  90  * Global applications HT used by the session daemon. This table is indexed by
  91  * socket using the sock_n node and sock value of an ust_app.
  92  *
  93  * The 'sock' in question here is the 'command' socket.
  94  */
  95 extern struct lttng_ht *ust_app_ht_by_sock;
  96
  97 /*
  98  * Global applications HT used by the session daemon. This table is indexed by
  99  * socket using the notify_sock_n node and notify_sock value of an ust_app.
 100  */
 101 extern struct lttng_ht *ust_app_ht_by_notify_sock;
 102
 103 /* Stream list containing ust_app_stream. */
 104 struct ust_app_stream_list {
 105         unsigned int count;
 106         struct cds_list_head head;
 107 };
 108
 109 struct ust_app_ctx {
 110         int handle;
 111         struct lttng_ust_context_attr ctx;
 112         struct lttng_ust_abi_object_data *obj;
 113         struct lttng_ht_node_ulong node;
 114         struct cds_list_head list;
 115 };
 116
 117 struct ust_app_event {
 118         bool enabled;
 119         int handle;
 120         struct lttng_ust_abi_object_data *obj;
 121         struct lttng_ust_abi_event attr;
 122         char name[LTTNG_UST_ABI_SYM_NAME_LEN];
 123         struct lttng_ht_node_str node;
 124         struct lttng_bytecode *filter;
 125         struct lttng_event_exclusion *exclusion;
 126 };
 127
 128 struct ust_app_event_notifier_rule {
 129         bool enabled;
 130         uint64_t error_counter_index;
 131         int handle;
 132         struct lttng_ust_abi_object_data *obj;
 133         /* Holds a strong reference. */
 134         struct lttng_trigger *trigger;
 135         /* Unique ID returned by the tracer to identify this event notifier. */
 136         uint64_t token;
 137         struct lttng_ht_node_u64 node;
 138         /* The trigger object owns the filter. */
 139         const struct lttng_bytecode *filter;
 140         /* Owned by this. */
 141         struct lttng_event_exclusion *exclusion;
 142         /* For delayed reclaim. */
 143         struct rcu_head rcu_head;
 144 };
 145
 146 struct ust_app_stream {
 147         int handle;
 148         char pathname[PATH_MAX];
 149         /* Format is %s_%d respectively channel name and CPU number. */
 150         char name[DEFAULT_STREAM_NAME_LEN];
 151         struct lttng_ust_abi_object_data *obj;
 152         /* Using a list of streams to keep order. */
 153         struct cds_list_head list;
 154 };
 155
 156 struct ust_app_channel {
 157         bool enabled;
 158         int handle;
 159         /*
 160          * Unique key used to identify the channel on the consumer side.
 161          * 0 is a reserved 'invalid' value used to indicate that the consumer
 162          * does not know about this channel (i.e. an error occurred).
 163          */
 164         uint64_t key;
 165         /* Id of the tracing channel set on creation. */
 166         uint64_t tracing_channel_id;
 167         /* Number of stream that this channel is expected to receive. */
 168         unsigned int expected_stream_count;
 169         char name[LTTNG_UST_ABI_SYM_NAME_LEN];
 170         struct lttng_ust_abi_object_data *obj;
 171         struct lttng_ust_ctl_consumer_channel_attr attr;
 172         struct ust_app_stream_list streams;
 173         /* Session pointer that owns this object. */
 174         struct ust_app_session *session;
 175         /*
 176          * Contexts are kept in a hash table for fast lookup and in an ordered list
 177          * so we are able to enable them on the tracer side in the same order the
 178          * user added them.
 179          */
 180         struct lttng_ht *ctx;
 181         struct cds_list_head ctx_list;
 182
 183         struct lttng_ht *events;
 184         uint64_t tracefile_size;
 185         uint64_t tracefile_count;
 186         uint64_t monitor_timer_interval;
 187         /*
 188          * Node indexed by channel name in the channels' hash table of a session.
 189          */
 190         struct lttng_ht_node_str node;
 191         /*
 192          * Node indexed by UST channel object descriptor (handle). Stored in the
 193          * ust_objd hash table in the ust_app object.
 194          */
 195         struct lttng_ht_node_ulong ust_objd_node;
 196         /* For delayed reclaim */
 197         struct rcu_head rcu_head;
 198 };
 199
 200 struct ust_app_session {
 201 private:
 202         static void _session_unlock(ust_app_session *session)
 203         {
 204                 _const_session_unlock(session);
 205         }
 206
 207         static void _const_session_unlock(const ust_app_session *session)
 208         {
 209                 pthread_mutex_unlock(&session->_lock);
 210         }
 211
 212 public:
 213         using locked_weak_ref = lttng::non_copyable_reference<
 214                 ust_app_session,
 215                 lttng::memory::create_deleter_class<ust_app_session,
 216                                                     ust_app_session::_session_unlock>::deleter>;
 217         using const_locked_weak_ref = lttng::non_copyable_reference<
 218                 const ust_app_session,
 219                 lttng::memory::create_deleter_class<const ust_app_session,
 220                                                     ust_app_session::_const_session_unlock>::deleter>;
 221
 222         static locked_weak_ref make_locked_weak_ref(ust_app_session& ua_session)
 223         {
 224                 return lttng::make_non_copyable_reference<locked_weak_ref::referenced_type,
 225                                                           locked_weak_ref::deleter>(ua_session);
 226         }
 227
 228         static const_locked_weak_ref make_locked_weak_ref(const ust_app_session& ua_session)
 229         {
 230                 return lttng::make_non_copyable_reference<const_locked_weak_ref::referenced_type,
 231                                                           const_locked_weak_ref::deleter>(
 232                         ua_session);
 233         }
 234
 235         ust_app_session::const_locked_weak_ref lock() const noexcept
 236         {
 237                 pthread_mutex_lock(&_lock);
 238                 return ust_app_session::make_locked_weak_ref(*this);
 239         }
 240
 241         ust_app_session::locked_weak_ref lock() noexcept
 242         {
 243                 pthread_mutex_lock(&_lock);
 244                 return ust_app_session::make_locked_weak_ref(*this);
 245         }
 246
 247         struct identifier {
 248                 enum class application_abi : std::uint8_t { ABI_32 = 32, ABI_64 = 64 };
 249                 enum class buffer_allocation_policy : std::uint8_t { PER_PID, PER_UID };
 250
 251                 /* Unique identifier of the ust_app_session. */
 252                 std::uint64_t id;
 253                 /* Unique identifier of the ltt_session. */
 254                 std::uint64_t session_id;
 255                 /* Credentials of the application which owns the ust_app_session. */
 256                 lttng_credentials app_credentials;
 257                 application_abi abi;
 258                 buffer_allocation_policy allocation_policy;
 259         };
 260
 261         identifier get_identifier() const noexcept
 262         {
 263                 /*
 264                  * To work around synchro design issues, this method allows the sampling
 265                  * of a ust_app_session's identifying properties without taking its lock.
 266                  *
 267                  * Since those properties are immutable, it is safe to sample them without
 268                  * holding the lock (as long as the existence of the instance is somehow
 269                  * guaranteed).
 270                  *
 271                  * The locking issue that motivates this method is that the application
 272                  * notitication handling thread needs to access the registry_session in response to
 273                  * a message from the application. The ust_app_session's ID is needed to look-up the
 274                  * registry session.
 275                  *
 276                  * The application's message can be emited in response to a command from the
 277                  * session daemon that is emited by the client thread.
 278                  *
 279                  * During that command, the client thread holds the ust_app_session lock until
 280                  * the application replies to the command. This causes the notification thread
 281                  * to block when it attempts to sample the ust_app_session's ID properties.
 282                  */
 283                 LTTNG_ASSERT(bits_per_long == 32 || bits_per_long == 64);
 284                 LTTNG_ASSERT(buffer_type == LTTNG_BUFFER_PER_PID ||
 285                              buffer_type == LTTNG_BUFFER_PER_UID);
 286
 287                 return { .id = id,
 288                          .session_id = tracing_id,
 289                          .app_credentials = real_credentials,
 290                          .abi = bits_per_long == 32 ? identifier::application_abi::ABI_32 :
 291                                                       identifier::application_abi::ABI_64,
 292                          .allocation_policy = buffer_type == LTTNG_BUFFER_PER_PID ?
 293                                  identifier::buffer_allocation_policy::PER_PID :
 294                                  identifier::buffer_allocation_policy::PER_UID };
 295         }
 296
 297         bool enabled = false;
 298         /* started: has the session been in started state at any time ? */
 299         bool started = false; /* allows detection of start vs restart. */
 300         int handle = 0; /* used has unique identifier for app session */
 301
 302         bool deleted = false; /* Session deleted flag. Check with lock held. */
 303
 304         /*
 305          * Tracing session ID. Multiple ust app session can have the same tracing
 306          * session id making this value NOT unique to the object.
 307          */
 308         uint64_t tracing_id = 0;
 309         uint64_t id = 0; /* Unique session identifier */
 310         struct lttng_ht *channels = nullptr; /* Registered channels */
 311         struct lttng_ht_node_u64 node = {};
 312         /*
 313          * Node indexed by UST session object descriptor (handle). Stored in the
 314          * ust_sessions_objd hash table in the ust_app object.
 315          */
 316         struct lttng_ht_node_ulong ust_objd_node = {};
 317         /* Starts with 'ust'; no leading slash. */
 318         char path[PATH_MAX] = {};
 319         /* UID/GID of the application owning the session */
 320         struct lttng_credentials real_credentials = {};
 321         /* Effective UID and GID. Same as the tracing session. */
 322         struct lttng_credentials effective_credentials = {};
 323         struct cds_list_head teardown_node = {};
 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         struct cds_list_head teardown_head;
 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, FormatContextType& ctx)
 455         {
 456                 return format_to(
 457                         ctx.out(),
 458                         "{{ procname = `{}`, ppid = {}, pid = {}, uid = {}, gid = {}, version = {}.{}, registration time = {} }}",
 459                         app.name,
 460                         app.ppid,
 461                         app.pid,
 462                         app.uid,
 463                         app.gid,
 464                         app.v_major,
 465                         app.v_minor,
 466                         lttng::utils::time_to_iso8601_str(app.registration_time));
 467         }
 468 };
 469 } /* namespace fmt */
 470
 471 #ifdef HAVE_LIBLTTNG_UST_CTL
 472
 473 int ust_app_register(struct ust_register_msg *msg, int sock);
 474 int ust_app_register_done(struct ust_app *app);
 475 int ust_app_version(struct ust_app *app);
 476 void ust_app_unregister_by_socket(int sock);
 477 int ust_app_start_trace_all(struct ltt_ust_session *usess);
 478 int ust_app_stop_trace_all(struct ltt_ust_session *usess);
 479 int ust_app_destroy_trace_all(struct ltt_ust_session *usess);
 480 int ust_app_list_events(struct lttng_event **events);
 481 int ust_app_list_event_fields(struct lttng_event_field **fields);
 482 int ust_app_create_event_glb(struct ltt_ust_session *usess,
 483                              struct ltt_ust_channel *uchan,
 484                              struct ltt_ust_event *uevent);
 485 int ust_app_disable_channel_glb(struct ltt_ust_session *usess, struct ltt_ust_channel *uchan);
 486 int ust_app_enable_channel_glb(struct ltt_ust_session *usess, struct ltt_ust_channel *uchan);
 487 int ust_app_enable_event_glb(struct ltt_ust_session *usess,
 488                              struct ltt_ust_channel *uchan,
 489                              struct ltt_ust_event *uevent);
 490 int ust_app_disable_event_glb(struct ltt_ust_session *usess,
 491                               struct ltt_ust_channel *uchan,
 492                               struct ltt_ust_event *uevent);
 493 int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
 494                                 struct ltt_ust_channel *uchan,
 495                                 struct ltt_ust_context *uctx);
 496 void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app);
 497 void ust_app_global_update_all(struct ltt_ust_session *usess);
 498 void ust_app_global_update_event_notifier_rules(struct ust_app *app);
 499 void ust_app_global_update_all_event_notifier_rules();
 500
 501 void ust_app_clean_list();
 502 int ust_app_ht_alloc();
 503 struct ust_app *ust_app_find_by_pid(pid_t pid);
 504 struct ust_app_stream *ust_app_alloc_stream();
 505 int ust_app_recv_registration(int sock, struct ust_register_msg *msg);
 506 int ust_app_recv_notify(int sock);
 507 void ust_app_add(struct ust_app *app);
 508 struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock);
 509 void ust_app_notify_sock_unregister(int sock);
 510
 511 enum lttng_error_code ust_app_snapshot_record(const struct ltt_ust_session *usess,
 512                                               const struct consumer_output *output,
 513                                               uint64_t nb_packets_per_stream);
 514 uint64_t ust_app_get_size_one_more_packet_per_stream(const struct ltt_ust_session *usess,
 515                                                      uint64_t cur_nr_packets);
 516 struct ust_app *ust_app_find_by_sock(int sock);
 517 int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id,
 518                                           struct cds_list_head *buffer_reg_uid_list,
 519                                           struct consumer_output *consumer,
 520                                           uint64_t uchan_id,
 521                                           int overwrite,
 522                                           uint64_t *discarded,
 523                                           uint64_t *lost);
 524 int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess,
 525                                           struct ltt_ust_channel *uchan,
 526                                           struct consumer_output *consumer,
 527                                           int overwrite,
 528                                           uint64_t *discarded,
 529                                           uint64_t *lost);
 530 int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess);
 531 enum lttng_error_code ust_app_create_channel_subdirectories(const struct ltt_ust_session *session);
 532 int ust_app_release_object(struct ust_app *app, struct lttng_ust_abi_object_data *data);
 533
 534 int ust_app_setup_event_notifier_group(struct ust_app *app);
 535
 536 static inline int ust_app_supported()
 537 {
 538         return 1;
 539 }
 540
 541 ust_app_session *ust_app_lookup_app_session(const struct ltt_ust_session *usess,
 542                                             const struct ust_app *app);
 543 lttng::sessiond::ust::registry_session *
 544 ust_app_get_session_registry(const ust_app_session::identifier& identifier);
 545
 546 lttng_ht *ust_app_get_all();
 547
 548 bool ust_app_supports_notifiers(const struct ust_app *app);
 549 bool ust_app_supports_counters(const struct ust_app *app);
 550
 551 bool ust_app_get(ust_app& app);
 552 void ust_app_put(ust_app *app);
 553
 554 using ust_app_reference =
 555         std::unique_ptr<ust_app, lttng::memory::create_deleter_class<ust_app, ust_app_put>::deleter>;
 556
 557 #else /* HAVE_LIBLTTNG_UST_CTL */
 558
 559 static inline int ust_app_destroy_trace_all(struct ltt_ust_session *usess __attribute__((unused)))
 560 {
 561         return 0;
 562 }
 563
 564 static inline int ust_app_start_trace(struct ltt_ust_session *usess __attribute__((unused)),
 565                                       struct ust_app *app __attribute__((unused)))
 566 {
 567         return 0;
 568 }
 569
 570 static inline int ust_app_start_trace_all(struct ltt_ust_session *usess __attribute__((unused)))
 571 {
 572         return 0;
 573 }
 574
 575 static inline int ust_app_stop_trace_all(struct ltt_ust_session *usess __attribute__((unused)))
 576 {
 577         return 0;
 578 }
 579
 580 static inline int ust_app_list_events(struct lttng_event **events __attribute__((unused)))
 581 {
 582         return -ENOSYS;
 583 }
 584
 585 static inline int ust_app_list_event_fields(struct lttng_event_field **fields
 586                                             __attribute__((unused)))
 587 {
 588         return -ENOSYS;
 589 }
 590
 591 static inline int ust_app_register(struct ust_register_msg *msg __attribute__((unused)),
 592                                    int sock __attribute__((unused)))
 593 {
 594         return -ENOSYS;
 595 }
 596
 597 static inline int ust_app_register_done(struct ust_app *app __attribute__((unused)))
 598 {
 599         return -ENOSYS;
 600 }
 601
 602 static inline int ust_app_version(struct ust_app *app __attribute__((unused)))
 603 {
 604         return -ENOSYS;
 605 }
 606
 607 static inline void ust_app_unregister_by_socket(int sock __attribute__((unused)))
 608 {
 609 }
 610
 611 static inline void ust_app_clean_list(void)
 612 {
 613 }
 614
 615 static inline struct ust_app_list *ust_app_get_list(void)
 616 {
 617         return NULL;
 618 }
 619
 620 static inline struct ust_app *ust_app_get_by_pid(pid_t pid __attribute__((unused)))
 621 {
 622         return NULL;
 623 }
 624
 625 static inline int ust_app_ht_alloc(void)
 626 {
 627         return 0;
 628 }
 629
 630 static inline void ust_app_global_update(struct ltt_ust_session *usess __attribute__((unused)),
 631                                          struct ust_app *app __attribute__((unused)))
 632 {
 633 }
 634
 635 static inline void ust_app_global_update_event_notifier_rules(struct ust_app *app
 636                                                               __attribute__((unused)))
 637 {
 638 }
 639
 640 static inline void ust_app_global_update_all_event_notifier_rules(void)
 641 {
 642 }
 643
 644 static inline int ust_app_setup_event_notifier_group(struct ust_app *app __attribute__((unused)))
 645 {
 646         return 0;
 647 }
 648
 649 static inline int ust_app_disable_channel_glb(struct ltt_ust_session *usess __attribute__((unused)),
 650                                               struct ltt_ust_channel *uchan __attribute__((unused)))
 651 {
 652         return 0;
 653 }
 654
 655 static inline int ust_app_enable_channel_glb(struct ltt_ust_session *usess __attribute__((unused)),
 656                                              struct ltt_ust_channel *uchan __attribute__((unused)))
 657 {
 658         return 0;
 659 }
 660
 661 static inline int ust_app_create_event_glb(struct ltt_ust_session *usess __attribute__((unused)),
 662                                            struct ltt_ust_channel *uchan __attribute__((unused)),
 663                                            struct ltt_ust_event *uevent __attribute__((unused)))
 664 {
 665         return 0;
 666 }
 667
 668 static inline int ust_app_disable_event_glb(struct ltt_ust_session *usess __attribute__((unused)),
 669                                             struct ltt_ust_channel *uchan __attribute__((unused)),
 670                                             struct ltt_ust_event *uevent __attribute__((unused)))
 671 {
 672         return 0;
 673 }
 674
 675 static inline int ust_app_enable_event_glb(struct ltt_ust_session *usess __attribute__((unused)),
 676                                            struct ltt_ust_channel *uchan __attribute__((unused)),
 677                                            struct ltt_ust_event *uevent __attribute__((unused)))
 678 {
 679         return 0;
 680 }
 681
 682 static inline int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess __attribute__((unused)),
 683                                               struct ltt_ust_channel *uchan __attribute__((unused)),
 684                                               struct ltt_ust_context *uctx __attribute__((unused)))
 685 {
 686         return 0;
 687 }
 688
 689 static inline int ust_app_enable_event_pid(struct ltt_ust_session *usess __attribute__((unused)),
 690                                            struct ltt_ust_channel *uchan __attribute__((unused)),
 691                                            struct ltt_ust_event *uevent __attribute__((unused)),
 692                                            pid_t pid __attribute__((unused)))
 693 {
 694         return 0;
 695 }
 696
 697 static inline int ust_app_recv_registration(int sock __attribute__((unused)),
 698                                             struct ust_register_msg *msg __attribute__((unused)))
 699 {
 700         return 0;
 701 }
 702
 703 static inline int ust_app_recv_notify(int sock __attribute__((unused)))
 704 {
 705         return 0;
 706 }
 707
 708 static inline struct ust_app *ust_app_create(struct ust_register_msg *msg __attribute__((unused)),
 709                                              int sock __attribute__((unused)))
 710 {
 711         return NULL;
 712 }
 713
 714 static inline void ust_app_add(struct ust_app *app __attribute__((unused)))
 715 {
 716 }
 717
 718 static inline void ust_app_notify_sock_unregister(int sock __attribute__((unused)))
 719 {
 720 }
 721
 722 static inline enum lttng_error_code
 723 ust_app_snapshot_record(struct ltt_ust_session *usess __attribute__((unused)),
 724                         const struct consumer_output *output __attribute__((unused)),
 725                         uint64_t max_stream_size __attribute__((unused)))
 726 {
 727         return LTTNG_ERR_UNK;
 728 }
 729
 730 static inline unsigned int ust_app_get_nb_stream(struct ltt_ust_session *usess
 731                                                  __attribute__((unused)))
 732 {
 733         return 0;
 734 }
 735
 736 static inline void ust_app_update_event_notifier_error_count(struct lttng_trigger *lttng_trigger
 737                                                              __attribute__((unused)))
 738 {
 739         return;
 740 }
 741
 742 static inline int ust_app_supported(void)
 743 {
 744         return 0;
 745 }
 746
 747 static inline bool ust_app_supports_notifiers(const struct ust_app *app __attribute__((unused)))
 748 {
 749         return false;
 750 }
 751
 752 static inline bool ust_app_supports_counters(const struct ust_app *app __attribute__((unused)))
 753 {
 754         return false;
 755 }
 756
 757 static inline struct ust_app *ust_app_find_by_sock(int sock __attribute__((unused)))
 758 {
 759         return NULL;
 760 }
 761
 762 static inline struct ust_app *ust_app_find_by_pid(pid_t pid __attribute__((unused)))
 763 {
 764         return NULL;
 765 }
 766
 767 static inline uint64_t
 768 ust_app_get_size_one_more_packet_per_stream(const struct ltt_ust_session *usess
 769                                             __attribute__((unused)),
 770                                             uint64_t cur_nr_packets __attribute__((unused)))
 771 {
 772         return 0;
 773 }
 774
 775 static inline int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id
 776                                                         __attribute__((unused)),
 777                                                         struct cds_list_head *buffer_reg_uid_list
 778                                                         __attribute__((unused)),
 779                                                         struct consumer_output *consumer
 780                                                         __attribute__((unused)),
 781                                                         int overwrite __attribute__((unused)),
 782                                                         uint64_t uchan_id __attribute__((unused)),
 783                                                         uint64_t *discarded __attribute__((unused)),
 784                                                         uint64_t *lost __attribute__((unused)))
 785 {
 786         return 0;
 787 }
 788
 789 static inline int
 790 ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess __attribute__((unused)),
 791                                       struct ltt_ust_channel *uchan __attribute__((unused)),
 792                                       struct consumer_output *consumer __attribute__((unused)),
 793                                       int overwrite __attribute__((unused)),
 794                                       uint64_t *discarded __attribute__((unused)),
 795                                       uint64_t *lost __attribute__((unused)))
 796 {
 797         return 0;
 798 }
 799
 800 static inline int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess
 801                                                    __attribute__((unused)))
 802 {
 803         return 0;
 804 }
 805
 806 static inline enum lttng_error_code
 807 ust_app_create_channel_subdirectories(const struct ltt_ust_session *session __attribute__((unused)))
 808 {
 809         return LTTNG_ERR_UNK;
 810 }
 811
 812 static inline ust_app_session *ust_app_lookup_app_session(const ltt_ust_session *, const ust_app *)
 813 {
 814         return nullptr;
 815 }
 816
 817 static inline lttng::sessiond::ust::registry_session *
 818 ust_app_get_session_registry(const ust_app_session::identifier&)
 819 {
 820         return nullptr;
 821 }
 822
 823 static inline lttng_ht *ust_app_get_all()
 824 {
 825         return nullptr;
 826 }
 827
 828 static inline int ust_app_release_object(struct ust_app *app __attribute__((unused)),
 829                                          struct lttng_ust_abi_object_data *data
 830                                          __attribute__((unused)))
 831 {
 832         return 0;
 833 }
 834
 835 static inline void ust_app_get(ust_app& app __attribute__((unused)))
 836 {
 837 }
 838
 839 static inline void ust_app_put(ust_app *app __attribute__((unused)))
 840 {
 841 }
 842
 843 #endif /* HAVE_LIBLTTNG_UST_CTL */
 844
 845 #endif /* _LTT_UST_APP_H */