src/bin/lttng-sessiond/ust-app.hpp

   1 /*
   2  * Copyright (C) 2011 EfficiOS Inc.
   3  * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   4  *
   5  * SPDX-License-Identifier: GPL-2.0-only
   6  *
   7  */
   8
   9 #ifndef _LTT_UST_APP_H
  10 #define _LTT_UST_APP_H
  11
  12 #include <stdint.h>
  13
  14 #include <common/index-allocator.hpp>
  15 #include <common/uuid.hpp>
  16
  17 #include "trace-ust.hpp"
  18 #include "ust-registry.hpp"
  19 #include "session.hpp"
  20
  21 #define UST_APP_EVENT_LIST_SIZE 32
  22
  23 /* Process name (short). */
  24 #define UST_APP_PROCNAME_LEN    16
  25
  26 struct lttng_bytecode;
  27 struct lttng_ust_filter_bytecode;
  28
  29 extern int the_ust_consumerd64_fd, the_ust_consumerd32_fd;
  30
  31 /*
  32  * Object used to close the notify socket in a call_rcu(). Since the
  33  * application might not be found, we need an independant object containing the
  34  * notify socket fd.
  35  */
  36 struct ust_app_notify_sock_obj {
  37         int fd;
  38         struct rcu_head head;
  39 };
  40
  41 struct ust_app_ht_key {
  42         const char *name;
  43         const struct lttng_bytecode *filter;
  44         enum lttng_ust_abi_loglevel_type loglevel_type;
  45         const struct lttng_event_exclusion *exclusion;
  46 };
  47
  48 /*
  49  * Application registration data structure.
  50  */
  51 struct ust_register_msg {
  52         enum lttng_ust_ctl_socket_type type;
  53         uint32_t major;
  54         uint32_t minor;
  55         uint32_t abi_major;
  56         uint32_t abi_minor;
  57         pid_t pid;
  58         pid_t ppid;
  59         uid_t uid;
  60         gid_t gid;
  61         uint32_t bits_per_long;
  62         uint32_t uint8_t_alignment;
  63         uint32_t uint16_t_alignment;
  64         uint32_t uint32_t_alignment;
  65         uint32_t uint64_t_alignment;
  66         uint32_t long_alignment;
  67         int byte_order;         /* BIG_ENDIAN or LITTLE_ENDIAN */
  68         char name[LTTNG_UST_ABI_PROCNAME_LEN];
  69 };
  70
  71 /*
  72  * Global applications HT used by the session daemon. This table is indexed by
  73  * PID using the pid_n node and pid value of an ust_app.
  74  */
  75 extern struct lttng_ht *ust_app_ht;
  76
  77 /*
  78  * Global applications HT used by the session daemon. This table is indexed by
  79  * socket using the sock_n node and sock value of an ust_app.
  80  *
  81  * The 'sock' in question here is the 'command' socket.
  82  */
  83 extern struct lttng_ht *ust_app_ht_by_sock;
  84
  85 /*
  86  * Global applications HT used by the session daemon. This table is indexed by
  87  * socket using the notify_sock_n node and notify_sock value of an ust_app.
  88  */
  89 extern struct lttng_ht *ust_app_ht_by_notify_sock;
  90
  91 /* Stream list containing ust_app_stream. */
  92 struct ust_app_stream_list {
  93         unsigned int count;
  94         struct cds_list_head head;
  95 };
  96
  97 struct ust_app_ctx {
  98         int handle;
  99         struct lttng_ust_context_attr ctx;
 100         struct lttng_ust_abi_object_data *obj;
 101         struct lttng_ht_node_ulong node;
 102         struct cds_list_head list;
 103 };
 104
 105 struct ust_app_event {
 106         int enabled;
 107         int handle;
 108         struct lttng_ust_abi_object_data *obj;
 109         struct lttng_ust_abi_event attr;
 110         char name[LTTNG_UST_ABI_SYM_NAME_LEN];
 111         struct lttng_ht_node_str node;
 112         struct lttng_bytecode *filter;
 113         struct lttng_event_exclusion *exclusion;
 114 };
 115
 116 struct ust_app_event_notifier_rule {
 117         int enabled;
 118         uint64_t error_counter_index;
 119         int handle;
 120         struct lttng_ust_abi_object_data *obj;
 121         /* Holds a strong reference. */
 122         struct lttng_trigger *trigger;
 123         /* Unique ID returned by the tracer to identify this event notifier. */
 124         uint64_t token;
 125         struct lttng_ht_node_u64 node;
 126         /* The trigger object owns the filter. */
 127         const struct lttng_bytecode *filter;
 128         /* Owned by this. */
 129         struct lttng_event_exclusion *exclusion;
 130         /* For delayed reclaim. */
 131         struct rcu_head rcu_head;
 132 };
 133
 134 struct ust_app_stream {
 135         int handle;
 136         char pathname[PATH_MAX];
 137         /* Format is %s_%d respectively channel name and CPU number. */
 138         char name[DEFAULT_STREAM_NAME_LEN];
 139         struct lttng_ust_abi_object_data *obj;
 140         /* Using a list of streams to keep order. */
 141         struct cds_list_head list;
 142 };
 143
 144 struct ust_app_channel {
 145         int enabled;
 146         int handle;
 147         /*
 148          * Unique key used to identify the channel on the consumer side.
 149          * 0 is a reserved 'invalid' value used to indicate that the consumer
 150          * does not know about this channel (i.e. an error occurred).
 151          */
 152         uint64_t key;
 153         /* Id of the tracing channel set on creation. */
 154         uint64_t tracing_channel_id;
 155         /* Number of stream that this channel is expected to receive. */
 156         unsigned int expected_stream_count;
 157         char name[LTTNG_UST_ABI_SYM_NAME_LEN];
 158         struct lttng_ust_abi_object_data *obj;
 159         struct lttng_ust_ctl_consumer_channel_attr attr;
 160         struct ust_app_stream_list streams;
 161         /* Session pointer that owns this object. */
 162         struct ust_app_session *session;
 163         /*
 164          * Contexts are kept in a hash table for fast lookup and in an ordered list
 165          * so we are able to enable them on the tracer side in the same order the
 166          * user added them.
 167          */
 168         struct lttng_ht *ctx;
 169         struct cds_list_head ctx_list;
 170
 171         struct lttng_ht *events;
 172         uint64_t tracefile_size;
 173         uint64_t tracefile_count;
 174         uint64_t monitor_timer_interval;
 175         /*
 176          * Node indexed by channel name in the channels' hash table of a session.
 177          */
 178         struct lttng_ht_node_str node;
 179         /*
 180          * Node indexed by UST channel object descriptor (handle). Stored in the
 181          * ust_objd hash table in the ust_app object.
 182          */
 183         struct lttng_ht_node_ulong ust_objd_node;
 184         /* For delayed reclaim */
 185         struct rcu_head rcu_head;
 186 };
 187
 188 struct ust_app_session {
 189         /*
 190          * Lock protecting this session's ust app interaction. Held
 191          * across command send/recv to/from app. Never nests within the
 192          * session registry lock.
 193          */
 194         pthread_mutex_t lock;
 195
 196         int enabled;
 197         /* started: has the session been in started state at any time ? */
 198         int started;  /* allows detection of start vs restart. */
 199         int handle;   /* used has unique identifier for app session */
 200
 201         bool deleted;   /* Session deleted flag. Check with lock held. */
 202
 203         /*
 204          * Tracing session ID. Multiple ust app session can have the same tracing
 205          * session id making this value NOT unique to the object.
 206          */
 207         uint64_t tracing_id;
 208         uint64_t id;    /* Unique session identifier */
 209         struct lttng_ht *channels; /* Registered channels */
 210         struct lttng_ht_node_u64 node;
 211         /*
 212          * Node indexed by UST session object descriptor (handle). Stored in the
 213          * ust_sessions_objd hash table in the ust_app object.
 214          */
 215         struct lttng_ht_node_ulong ust_objd_node;
 216         /* Starts with 'ust'; no leading slash. */
 217         char path[PATH_MAX];
 218         /* UID/GID of the application owning the session */
 219         struct lttng_credentials real_credentials;
 220         /* Effective UID and GID. Same as the tracing session. */
 221         struct lttng_credentials effective_credentials;
 222         struct cds_list_head teardown_node;
 223         /*
 224          * Once at least *one* session is created onto the application, the
 225          * corresponding consumer is set so we can use it on unregistration.
 226          */
 227         struct consumer_output *consumer;
 228         enum lttng_buffer_type buffer_type;
 229         /* ABI of the session. Same value as the application. */
 230         uint32_t bits_per_long;
 231         /* For delayed reclaim */
 232         struct rcu_head rcu_head;
 233         /* If the channel's streams have to be outputed or not. */
 234         unsigned int output_traces;
 235         unsigned int live_timer_interval;       /* usec */
 236
 237         /* Metadata channel attributes. */
 238         struct lttng_ust_ctl_consumer_channel_attr metadata_attr;
 239
 240         char root_shm_path[PATH_MAX];
 241         char shm_path[PATH_MAX];
 242 };
 243
 244 /*
 245  * Registered traceable applications. Libust registers to the session daemon
 246  * and a linked list is kept of all running traceable app.
 247  */
 248 struct ust_app {
 249         int sock;
 250         pthread_mutex_t sock_lock;      /* Protects sock protocol. */
 251
 252         int notify_sock;
 253         pid_t pid;
 254         pid_t ppid;
 255         uid_t uid;           /* User ID that owns the apps */
 256         gid_t gid;           /* Group ID that owns the apps */
 257
 258         /* App ABI */
 259         uint32_t bits_per_long;
 260         uint32_t uint8_t_alignment;
 261         uint32_t uint16_t_alignment;
 262         uint32_t uint32_t_alignment;
 263         uint32_t uint64_t_alignment;
 264         uint32_t long_alignment;
 265         int byte_order;         /* BIG_ENDIAN or LITTLE_ENDIAN */
 266
 267         int compatible; /* If the lttng-ust tracer version does not match the
 268                                            supported version of the session daemon, this flag is
 269                                            set to 0 (NOT compatible) else 1. */
 270         struct lttng_ust_abi_tracer_version version;
 271         uint32_t v_major;    /* Version major number */
 272         uint32_t v_minor;    /* Version minor number */
 273         /* Extra for the NULL byte. */
 274         char name[UST_APP_PROCNAME_LEN + 1];
 275         /* Type of buffer this application uses. */
 276         enum lttng_buffer_type buffer_type;
 277         struct lttng_ht *sessions;
 278         struct lttng_ht_node_ulong pid_n;
 279         struct lttng_ht_node_ulong sock_n;
 280         struct lttng_ht_node_ulong notify_sock_n;
 281         /*
 282          * This is a list of ust app session that, once the app is going into
 283          * teardown mode, in the RCU call, each node in this list is removed and
 284          * deleted.
 285          *
 286          * Element of the list are added when an application unregisters after each
 287          * ht_del of ust_app_session associated to this app. This list is NOT used
 288          * when a session is destroyed.
 289          */
 290         struct cds_list_head teardown_head;
 291         /*
 292          * Hash table containing ust_app_channel indexed by channel objd.
 293          */
 294         struct lttng_ht *ust_objd;
 295         /*
 296          * Hash table containing ust_app_session indexed by objd.
 297          */
 298         struct lttng_ht *ust_sessions_objd;
 299
 300         /*
 301          * If this application is of the agent domain and this is non negative then
 302          * a lookup MUST be done to acquire a read side reference to the
 303          * corresponding agent app object. If the lookup fails, this should be set
 304          * to a negative value indicating that the agent application is gone.
 305          */
 306         int agent_app_sock;
 307         /*
 308          * Time at which the app is registred.
 309          * Used for path creation
 310          */
 311         time_t registration_time;
 312         /*
 313          * Event notifier
 314          */
 315         struct {
 316                 /*
 317                  * Handle to the lttng_ust object representing the event
 318                  * notifier group.
 319                  */
 320                 struct lttng_ust_abi_object_data *object;
 321                 struct lttng_pipe *event_pipe;
 322                 struct lttng_ust_abi_object_data *counter;
 323                 struct lttng_ust_abi_object_data **counter_cpu;
 324                 int nr_counter_cpu;
 325         } event_notifier_group;
 326         /*
 327          * Hashtable indexing the application's event notifier rule's
 328          * (ust_app_event_notifier_rule) by their token's value.
 329          */
 330         struct lttng_ht *token_to_event_notifier_rule_ht;
 331 };
 332
 333 #ifdef HAVE_LIBLTTNG_UST_CTL
 334
 335 int ust_app_register(struct ust_register_msg *msg, int sock);
 336 int ust_app_register_done(struct ust_app *app);
 337 int ust_app_version(struct ust_app *app);
 338 void ust_app_unregister(int sock);
 339 int ust_app_start_trace_all(struct ltt_ust_session *usess);
 340 int ust_app_stop_trace_all(struct ltt_ust_session *usess);
 341 int ust_app_destroy_trace_all(struct ltt_ust_session *usess);
 342 int ust_app_list_events(struct lttng_event **events);
 343 int ust_app_list_event_fields(struct lttng_event_field **fields);
 344 int ust_app_create_event_glb(struct ltt_ust_session *usess,
 345                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
 346 int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
 347                 struct ltt_ust_channel *uchan);
 348 int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
 349                 struct ltt_ust_channel *uchan);
 350 int ust_app_enable_event_glb(struct ltt_ust_session *usess,
 351                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
 352 int ust_app_disable_event_glb(struct ltt_ust_session *usess,
 353                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
 354 int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
 355                 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx);
 356 void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app);
 357 void ust_app_global_update_all(struct ltt_ust_session *usess);
 358 void ust_app_global_update_event_notifier_rules(struct ust_app *app);
 359 void ust_app_global_update_all_event_notifier_rules(void);
 360
 361 void ust_app_clean_list(void);
 362 int ust_app_ht_alloc(void);
 363 struct ust_app *ust_app_find_by_pid(pid_t pid);
 364 struct ust_app_stream *ust_app_alloc_stream(void);
 365 int ust_app_recv_registration(int sock, struct ust_register_msg *msg);
 366 int ust_app_recv_notify(int sock);
 367 void ust_app_add(struct ust_app *app);
 368 struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock);
 369 void ust_app_notify_sock_unregister(int sock);
 370 ssize_t ust_app_push_metadata(ust_registry_session *registry,
 371                 struct consumer_socket *socket, int send_zero_data);
 372 void ust_app_destroy(struct ust_app *app);
 373 enum lttng_error_code ust_app_snapshot_record(
 374                 const struct ltt_ust_session *usess,
 375                 const struct consumer_output *output,
 376                 uint64_t nb_packets_per_stream);
 377 uint64_t ust_app_get_size_one_more_packet_per_stream(
 378                 const struct ltt_ust_session *usess, uint64_t cur_nr_packets);
 379 struct ust_app *ust_app_find_by_sock(int sock);
 380 int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id,
 381                 struct cds_list_head *buffer_reg_uid_list,
 382                 struct consumer_output *consumer, uint64_t uchan_id,
 383                 int overwrite, uint64_t *discarded, uint64_t *lost);
 384 int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess,
 385                 struct ltt_ust_channel *uchan,
 386                 struct consumer_output *consumer,
 387                 int overwrite, uint64_t *discarded, uint64_t *lost);
 388 int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess);
 389 enum lttng_error_code ust_app_rotate_session(struct ltt_session *session);
 390 enum lttng_error_code ust_app_create_channel_subdirectories(
 391                 const struct ltt_ust_session *session);
 392 int ust_app_release_object(struct ust_app *app,
 393                 struct lttng_ust_abi_object_data *data);
 394 enum lttng_error_code ust_app_clear_session(struct ltt_session *session);
 395 enum lttng_error_code ust_app_open_packets(struct ltt_session *session);
 396
 397 int ust_app_setup_event_notifier_group(struct ust_app *app);
 398
 399 static inline
 400 int ust_app_supported(void)
 401 {
 402         return 1;
 403 }
 404
 405 bool ust_app_supports_notifiers(const struct ust_app *app);
 406 bool ust_app_supports_counters(const struct ust_app *app);
 407
 408 #else /* HAVE_LIBLTTNG_UST_CTL */
 409
 410 static inline
 411 int ust_app_destroy_trace_all(
 412                 struct ltt_ust_session *usess __attribute__((unused)))
 413 {
 414         return 0;
 415 }
 416
 417 static inline
 418 int ust_app_start_trace(
 419                 struct ltt_ust_session *usess __attribute__((unused)),
 420                 struct ust_app *app __attribute__((unused)))
 421 {
 422         return 0;
 423 }
 424
 425 static inline
 426 int ust_app_start_trace_all(
 427                 struct ltt_ust_session *usess __attribute__((unused)))
 428 {
 429         return 0;
 430 }
 431
 432 static inline
 433 int ust_app_stop_trace_all(
 434                 struct ltt_ust_session *usess __attribute__((unused)))
 435 {
 436         return 0;
 437 }
 438
 439 static inline
 440 int ust_app_list_events(
 441                 struct lttng_event **events __attribute__((unused)))
 442 {
 443         return -ENOSYS;
 444 }
 445
 446 static inline
 447 int ust_app_list_event_fields(
 448                 struct lttng_event_field **fields __attribute__((unused)))
 449 {
 450         return -ENOSYS;
 451 }
 452
 453 static inline
 454 int ust_app_register(
 455                 struct ust_register_msg *msg __attribute__((unused)),
 456                 int sock __attribute__((unused)))
 457 {
 458         return -ENOSYS;
 459 }
 460
 461 static inline
 462 int ust_app_register_done(struct ust_app *app __attribute__((unused)))
 463 {
 464         return -ENOSYS;
 465 }
 466
 467 static inline
 468 int ust_app_version(struct ust_app *app __attribute__((unused)))
 469 {
 470         return -ENOSYS;
 471 }
 472
 473 static inline
 474 void ust_app_unregister(int sock __attribute__((unused)))
 475 {
 476 }
 477
 478 static inline
 479 void ust_app_clean_list(void)
 480 {
 481 }
 482
 483 static inline
 484 struct ust_app_list *ust_app_get_list(void)
 485 {
 486         return NULL;
 487 }
 488
 489 static inline
 490 struct ust_app *ust_app_get_by_pid(pid_t pid __attribute__((unused)))
 491 {
 492         return NULL;
 493 }
 494
 495 static inline
 496 int ust_app_ht_alloc(void)
 497 {
 498         return 0;
 499 }
 500
 501 static inline
 502 void ust_app_global_update(
 503                 struct ltt_ust_session *usess __attribute__((unused)),
 504                 struct ust_app *app __attribute__((unused)))
 505 {}
 506
 507 static inline
 508 void ust_app_global_update_event_notifier_rules(
 509                 struct ust_app *app __attribute__((unused)))
 510 {}
 511
 512 static inline
 513 void ust_app_global_update_all_event_notifier_rules(void)
 514 {}
 515
 516 static inline
 517 int ust_app_setup_event_notifier_group(
 518                 struct ust_app *app __attribute__((unused)))
 519 {
 520         return 0;
 521 }
 522
 523 static inline
 524 int ust_app_disable_channel_glb(
 525                 struct ltt_ust_session *usess __attribute__((unused)),
 526                 struct ltt_ust_channel *uchan __attribute__((unused)))
 527 {
 528         return 0;
 529 }
 530
 531 static inline
 532 int ust_app_enable_channel_glb(
 533                 struct ltt_ust_session *usess __attribute__((unused)),
 534                 struct ltt_ust_channel *uchan __attribute__((unused)))
 535 {
 536         return 0;
 537 }
 538
 539 static inline
 540 int ust_app_create_event_glb(
 541                 struct ltt_ust_session *usess __attribute__((unused)),
 542                 struct ltt_ust_channel *uchan __attribute__((unused)),
 543                 struct ltt_ust_event *uevent __attribute__((unused)))
 544 {
 545         return 0;
 546 }
 547
 548 static inline
 549 int ust_app_disable_event_glb(
 550                 struct ltt_ust_session *usess __attribute__((unused)),
 551                 struct ltt_ust_channel *uchan __attribute__((unused)),
 552                 struct ltt_ust_event *uevent __attribute__((unused)))
 553 {
 554         return 0;
 555 }
 556
 557 static inline
 558 int ust_app_enable_event_glb(
 559                 struct ltt_ust_session *usess __attribute__((unused)),
 560                 struct ltt_ust_channel *uchan __attribute__((unused)),
 561                 struct ltt_ust_event *uevent __attribute__((unused)))
 562 {
 563         return 0;
 564 }
 565
 566 static inline
 567 int ust_app_add_ctx_channel_glb(
 568                 struct ltt_ust_session *usess __attribute__((unused)),
 569                 struct ltt_ust_channel *uchan __attribute__((unused)),
 570                 struct ltt_ust_context *uctx __attribute__((unused)))
 571 {
 572         return 0;
 573 }
 574
 575 static inline
 576 int ust_app_enable_event_pid(
 577                 struct ltt_ust_session *usess __attribute__((unused)),
 578                 struct ltt_ust_channel *uchan __attribute__((unused)),
 579                 struct ltt_ust_event *uevent __attribute__((unused)),
 580                 pid_t pid __attribute__((unused)))
 581 {
 582         return 0;
 583 }
 584
 585 static inline
 586 int ust_app_recv_registration(
 587                 int sock __attribute__((unused)),
 588                 struct ust_register_msg *msg __attribute__((unused)))
 589 {
 590         return 0;
 591 }
 592
 593 static inline
 594 int ust_app_recv_notify(int sock __attribute__((unused)))
 595 {
 596         return 0;
 597 }
 598
 599 static inline
 600 struct ust_app *ust_app_create(
 601                 struct ust_register_msg *msg __attribute__((unused)),
 602                 int sock __attribute__((unused)))
 603 {
 604         return NULL;
 605 }
 606
 607 static inline
 608 void ust_app_add(struct ust_app *app __attribute__((unused)))
 609 {
 610 }
 611
 612 static inline
 613 void ust_app_notify_sock_unregister(int sock __attribute__((unused)))
 614 {
 615 }
 616
 617 static inline
 618 ssize_t ust_app_push_metadata(
 619                 ust_registry_session *registry __attribute__((unused)),
 620                 struct consumer_socket *socket __attribute__((unused)),
 621                 int send_zero_data __attribute__((unused)))
 622 {
 623         return 0;
 624 }
 625
 626 static inline
 627 void ust_app_destroy(struct ust_app *app __attribute__((unused)))
 628 {
 629         return;
 630 }
 631
 632 static inline
 633 enum lttng_error_code ust_app_snapshot_record(
 634                 struct ltt_ust_session *usess __attribute__((unused)),
 635                 const struct consumer_output *output __attribute__((unused)),
 636                 uint64_t max_stream_size __attribute__((unused)))
 637 {
 638         return LTTNG_ERR_UNK;
 639 }
 640
 641 static inline
 642 unsigned int ust_app_get_nb_stream(
 643                 struct ltt_ust_session *usess __attribute__((unused)))
 644 {
 645         return 0;
 646 }
 647
 648 static inline
 649 void ust_app_update_event_notifier_error_count(
 650                 struct lttng_trigger *lttng_trigger __attribute__((unused)))
 651 {
 652         return;
 653 }
 654
 655 static inline
 656 int ust_app_supported(void)
 657 {
 658         return 0;
 659 }
 660
 661 static inline
 662 bool ust_app_supports_notifiers(
 663                 const struct ust_app *app __attribute__((unused)))
 664 {
 665         return false;
 666 }
 667
 668 static inline
 669 bool ust_app_supports_counters(
 670                 const struct ust_app *app __attribute__((unused)))
 671 {
 672         return false;
 673 }
 674
 675 static inline
 676 struct ust_app *ust_app_find_by_sock(int sock __attribute__((unused)))
 677 {
 678         return NULL;
 679 }
 680
 681 static inline
 682 struct ust_app *ust_app_find_by_pid(pid_t pid __attribute__((unused)))
 683 {
 684         return NULL;
 685 }
 686
 687 static inline
 688 uint64_t ust_app_get_size_one_more_packet_per_stream(
 689                 const struct ltt_ust_session *usess __attribute__((unused)),
 690                 uint64_t cur_nr_packets __attribute__((unused))) {
 691         return 0;
 692 }
 693
 694 static inline
 695 int ust_app_uid_get_channel_runtime_stats(
 696                 uint64_t ust_session_id __attribute__((unused)),
 697                 struct cds_list_head *buffer_reg_uid_list __attribute__((unused)),
 698                 struct consumer_output *consumer __attribute__((unused)),
 699                 int overwrite __attribute__((unused)),
 700                 uint64_t uchan_id __attribute__((unused)),
 701                 uint64_t *discarded __attribute__((unused)),
 702                 uint64_t *lost __attribute__((unused)))
 703 {
 704         return 0;
 705 }
 706
 707 static inline
 708 int ust_app_pid_get_channel_runtime_stats(
 709                 struct ltt_ust_session *usess __attribute__((unused)),
 710                 struct ltt_ust_channel *uchan __attribute__((unused)),
 711                 struct consumer_output *consumer __attribute__((unused)),
 712                 int overwrite __attribute__((unused)),
 713                 uint64_t *discarded __attribute__((unused)),
 714                 uint64_t *lost __attribute__((unused)))
 715 {
 716         return 0;
 717 }
 718
 719 static inline
 720 int ust_app_regenerate_statedump_all(
 721                 struct ltt_ust_session *usess __attribute__((unused)))
 722 {
 723         return 0;
 724 }
 725
 726 static inline
 727 enum lttng_error_code ust_app_rotate_session(
 728                 struct ltt_session *session __attribute__((unused)))
 729 {
 730         return LTTNG_ERR_UNK;
 731 }
 732
 733 static inline
 734 enum lttng_error_code ust_app_create_channel_subdirectories(
 735                 const struct ltt_ust_session *session __attribute__((unused)))
 736 {
 737         return LTTNG_ERR_UNK;
 738 }
 739
 740 static inline
 741 int ust_app_release_object(struct ust_app *app __attribute__((unused)),
 742                 struct lttng_ust_abi_object_data *data __attribute__((unused)))
 743 {
 744         return 0;
 745 }
 746
 747 static inline
 748 enum lttng_error_code ust_app_clear_session(
 749                 struct ltt_session *session __attribute__((unused)))
 750 {
 751         return LTTNG_ERR_UNK;
 752 }
 753
 754 static inline
 755 enum lttng_error_code ust_app_open_packets(
 756                 struct ltt_session *session __attribute__((unused)))
 757 {
 758         return LTTNG_ERR_UNK;
 759 }
 760
 761 #endif /* HAVE_LIBLTTNG_UST_CTL */
 762
 763 #endif /* _LTT_UST_APP_H */