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