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