src/common/consumer.h

   1 /*
   2  * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
   3  *                      Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   4  *               2012 - David Goulet <dgoulet@efficios.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License, version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 #ifndef LIB_CONSUMER_H
  21 #define LIB_CONSUMER_H
  22
  23 #include <limits.h>
  24 #include <poll.h>
  25 #include <unistd.h>
  26 #include <urcu/list.h>
  27
  28 #include <lttng/lttng.h>
  29
  30 #include <common/hashtable/hashtable.h>
  31 #include <common/compat/fcntl.h>
  32 #include <common/compat/uuid.h>
  33 #include <common/sessiond-comm/sessiond-comm.h>
  34 #include <common/pipe.h>
  35 #include <common/index/ctf-index.h>
  36
  37 /* Commands for consumer */
  38 enum lttng_consumer_command {
  39         LTTNG_CONSUMER_ADD_CHANNEL,
  40         LTTNG_CONSUMER_ADD_STREAM,
  41         /* pause, delete, active depending on fd state */
  42         LTTNG_CONSUMER_UPDATE_STREAM,
  43         /* inform the consumer to quit when all fd has hang up */
  44         LTTNG_CONSUMER_STOP,
  45         LTTNG_CONSUMER_ADD_RELAYD_SOCKET,
  46         /* Inform the consumer to kill a specific relayd connection */
  47         LTTNG_CONSUMER_DESTROY_RELAYD,
  48         /* Return to the sessiond if there is data pending for a session */
  49         LTTNG_CONSUMER_DATA_PENDING,
  50         /* Consumer creates a channel and returns it to sessiond. */
  51         LTTNG_CONSUMER_ASK_CHANNEL_CREATION,
  52         LTTNG_CONSUMER_GET_CHANNEL,
  53         LTTNG_CONSUMER_DESTROY_CHANNEL,
  54         LTTNG_CONSUMER_PUSH_METADATA,
  55         LTTNG_CONSUMER_CLOSE_METADATA,
  56         LTTNG_CONSUMER_SETUP_METADATA,
  57         LTTNG_CONSUMER_FLUSH_CHANNEL,
  58         LTTNG_CONSUMER_SNAPSHOT_CHANNEL,
  59         LTTNG_CONSUMER_SNAPSHOT_METADATA,
  60         LTTNG_CONSUMER_STREAMS_SENT,
  61 };
  62
  63 /* State of each fd in consumer */
  64 enum lttng_consumer_stream_state {
  65         LTTNG_CONSUMER_ACTIVE_STREAM,
  66         LTTNG_CONSUMER_PAUSE_STREAM,
  67         LTTNG_CONSUMER_DELETE_STREAM,
  68 };
  69
  70 enum lttng_consumer_type {
  71         LTTNG_CONSUMER_UNKNOWN = 0,
  72         LTTNG_CONSUMER_KERNEL,
  73         LTTNG_CONSUMER64_UST,
  74         LTTNG_CONSUMER32_UST,
  75 };
  76
  77 enum consumer_endpoint_status {
  78         CONSUMER_ENDPOINT_ACTIVE,
  79         CONSUMER_ENDPOINT_INACTIVE,
  80 };
  81
  82 enum consumer_channel_output {
  83         CONSUMER_CHANNEL_MMAP   = 0,
  84         CONSUMER_CHANNEL_SPLICE = 1,
  85 };
  86
  87 enum consumer_channel_type {
  88         CONSUMER_CHANNEL_TYPE_METADATA  = 0,
  89         CONSUMER_CHANNEL_TYPE_DATA      = 1,
  90 };
  91
  92 extern struct lttng_consumer_global_data consumer_data;
  93
  94 struct stream_list {
  95         struct cds_list_head head;
  96         unsigned int count;
  97 };
  98
  99 /* Stub. */
 100 struct consumer_metadata_cache;
 101
 102 struct lttng_consumer_channel {
 103         /* HT node used for consumer_data.channel_ht */
 104         struct lttng_ht_node_u64 node;
 105         /* Indexed key. Incremented value in the consumer. */
 106         uint64_t key;
 107         /* Number of streams referencing this channel */
 108         int refcount;
 109         /* Tracing session id on the session daemon side. */
 110         uint64_t session_id;
 111         /*
 112          * Session id when requesting metadata to the session daemon for
 113          * a session with per-PID buffers.
 114          */
 115         uint64_t session_id_per_pid;
 116         /* Channel trace file path name. */
 117         char pathname[PATH_MAX];
 118         /* Channel name. */
 119         char name[LTTNG_SYMBOL_NAME_LEN];
 120         /* UID and GID of the session owning this channel. */
 121         uid_t uid;
 122         gid_t gid;
 123         /* Relayd id of the channel. -1ULL if it does not apply. */
 124         uint64_t relayd_id;
 125         /*
 126          * Number of streams NOT initialized yet. This is used in order to not
 127          * delete this channel if streams are getting initialized.
 128          */
 129         unsigned int nb_init_stream_left;
 130         /* Output type (mmap or splice). */
 131         enum consumer_channel_output output;
 132         /* Channel type for stream */
 133         enum consumer_channel_type type;
 134
 135         /* For UST */
 136         uid_t ust_app_uid;      /* Application UID. */
 137         struct ustctl_consumer_channel *uchan;
 138         unsigned char uuid[UUID_STR_LEN];
 139         /*
 140          * Temporary stream list used to store the streams once created and waiting
 141          * to be sent to the session daemon by receiving the
 142          * LTTNG_CONSUMER_GET_CHANNEL.
 143          */
 144         struct stream_list streams;
 145
 146         /*
 147          * Set if the channel is metadata. We keep a reference to the stream
 148          * because we have to flush data once pushed by the session daemon. For a
 149          * regular channel, this is always set to NULL.
 150          */
 151         struct lttng_consumer_stream *metadata_stream;
 152
 153         /* for UST */
 154         int wait_fd;
 155         /* Node within channel thread ht */
 156         struct lttng_ht_node_u64 wait_fd_node;
 157
 158         /* Metadata cache is metadata channel */
 159         struct consumer_metadata_cache *metadata_cache;
 160         /* For UST metadata periodical flush */
 161         int switch_timer_enabled;
 162         timer_t switch_timer;
 163         int switch_timer_error;
 164
 165         /* For the live mode */
 166         int live_timer_enabled;
 167         timer_t live_timer;
 168         int live_timer_error;
 169
 170         /* On-disk circular buffer */
 171         uint64_t tracefile_size;
 172         uint64_t tracefile_count;
 173         /*
 174          * Monitor or not the streams of this channel meaning this indicates if the
 175          * streams should be sent to the data/metadata thread or added to the no
 176          * monitor list of the channel.
 177          */
 178         unsigned int monitor;
 179
 180         /*
 181          * Channel lock.
 182          *
 183          * This lock protects against concurrent update of channel.
 184          *
 185          * This is nested INSIDE the consumer data lock.
 186          * This is nested OUTSIDE the channel timer lock.
 187          * This is nested OUTSIDE the metadata cache lock.
 188          * This is nested OUTSIDE stream lock.
 189          * This is nested OUTSIDE consumer_relayd_sock_pair lock.
 190          */
 191         pthread_mutex_t lock;
 192
 193         /*
 194          * Channel teardown lock.
 195          *
 196          * This lock protect against teardown of channel. It is _never_
 197          * taken by the timer handler.
 198          *
 199          * This is nested INSIDE the consumer data lock.
 200          * This is nested INSIDE the channel lock.
 201          * This is nested OUTSIDE the metadata cache lock.
 202          * This is nested OUTSIDE stream lock.
 203          * This is nested OUTSIDE consumer_relayd_sock_pair lock.
 204          */
 205         pthread_mutex_t timer_lock;
 206
 207         /* Timer value in usec for live streaming. */
 208         unsigned int live_timer_interval;
 209 };
 210
 211 /*
 212  * Internal representation of the streams, sessiond_key is used to identify
 213  * uniquely a stream.
 214  */
 215 struct lttng_consumer_stream {
 216         /* HT node used by the data_ht and metadata_ht */
 217         struct lttng_ht_node_u64 node;
 218         /* stream indexed per channel key node */
 219         struct lttng_ht_node_u64 node_channel_id;
 220         /* HT node used in consumer_data.stream_list_ht */
 221         struct lttng_ht_node_u64 node_session_id;
 222         /* Pointer to associated channel. */
 223         struct lttng_consumer_channel *chan;
 224
 225         /* Key by which the stream is indexed for 'node'. */
 226         uint64_t key;
 227         /*
 228          * File descriptor of the data output file. This can be either a file or a
 229          * socket fd for relayd streaming.
 230          */
 231         int out_fd; /* output file to write the data */
 232         /* Write position in the output file descriptor */
 233         off_t out_fd_offset;
 234         /* Amount of bytes written to the output */
 235         uint64_t output_written;
 236         enum lttng_consumer_stream_state state;
 237         int shm_fd_is_copy;
 238         int data_read;
 239         int hangup_flush_done;
 240         enum lttng_event_output output;
 241         /* Maximum subbuffer size. */
 242         unsigned long max_sb_size;
 243
 244         /*
 245          * Still used by the kernel for MMAP output. For UST, the ustctl getter is
 246          * used for the mmap base and offset.
 247          */
 248         void *mmap_base;
 249         unsigned long mmap_len;
 250
 251         /* For UST */
 252
 253         int wait_fd;
 254         /* UID/GID of the user owning the session to which stream belongs */
 255         uid_t uid;
 256         gid_t gid;
 257         /* Network sequence number. Indicating on which relayd socket it goes. */
 258         uint64_t net_seq_idx;
 259         /*
 260          * Indicate if this stream was successfully sent to a relayd. This is set
 261          * after the refcount of the relayd is incremented and is checked when the
 262          * stream is closed before decrementing the refcount in order to avoid an
 263          * unbalanced state.
 264          */
 265         unsigned int sent_to_relayd;
 266
 267         /* Identify if the stream is the metadata */
 268         unsigned int metadata_flag;
 269         /* Used when the stream is set for network streaming */
 270         uint64_t relayd_stream_id;
 271         /*
 272          * When sending a stream packet to a relayd, this number is used to track
 273          * the packet sent by the consumer and seen by the relayd. When sending the
 274          * data header to the relayd, this number is sent and if the transmission
 275          * was successful, it is incremented.
 276          *
 277          * Even if the full data is not fully transmitted it won't matter since
 278          * only two possible error can happen after that where either the relayd
 279          * died or a read error is detected on the stream making this value useless
 280          * after that.
 281          *
 282          * This value SHOULD be read/updated atomically or with the lock acquired.
 283          */
 284         uint64_t next_net_seq_num;
 285         /*
 286          * Lock to use the stream FDs since they are used between threads.
 287          *
 288          * This is nested INSIDE the consumer_data lock.
 289          * This is nested INSIDE the metadata cache lock.
 290          * This is nested INSIDE the channel lock.
 291          * This is nested INSIDE the channel timer lock.
 292          * This is nested OUTSIDE consumer_relayd_sock_pair lock.
 293          */
 294         pthread_mutex_t lock;
 295         /* Tracing session id */
 296         uint64_t session_id;
 297         /*
 298          * Indicates if the stream end point is still active or not (network
 299          * streaming or local file system). The thread "owning" the stream is
 300          * handling this status and can be notified of a state change through the
 301          * consumer data appropriate pipe.
 302          */
 303         enum consumer_endpoint_status endpoint_status;
 304         /* Stream name. Format is: <channel_name>_<cpu_number> */
 305         char name[LTTNG_SYMBOL_NAME_LEN];
 306         /* Internal state of libustctl. */
 307         struct ustctl_consumer_stream *ustream;
 308         struct cds_list_head send_node;
 309         /* On-disk circular buffer */
 310         uint64_t tracefile_size_current;
 311         uint64_t tracefile_count_current;
 312         /*
 313          * Monitor or not the streams of this channel meaning this indicates if the
 314          * streams should be sent to the data/metadata thread or added to the no
 315          * monitor list of the channel.
 316          */
 317         unsigned int monitor;
 318         /*
 319          * Indicate if the stream is globally visible meaning that it has been
 320          * added to the multiple hash tables. If *not* set, NO lock should be
 321          * acquired in the destroy path.
 322          */
 323         unsigned int globally_visible;
 324         /*
 325          * Pipe to wake up the metadata poll thread when the UST metadata
 326          * cache is updated.
 327          */
 328         int ust_metadata_poll_pipe[2];
 329         /*
 330          * How much metadata was read from the metadata cache and sent
 331          * to the channel.
 332          */
 333         uint64_t ust_metadata_pushed;
 334         /*
 335          * FD of the index file for this stream.
 336          */
 337         int index_fd;
 338
 339         /*
 340          * Rendez-vous point between data and metadata stream in live mode.
 341          */
 342         pthread_cond_t metadata_rdv;
 343         pthread_mutex_t metadata_rdv_lock;
 344 };
 345
 346 /*
 347  * Internal representation of a relayd socket pair.
 348  */
 349 struct consumer_relayd_sock_pair {
 350         /* Network sequence number. */
 351         uint64_t net_seq_idx;
 352         /* Number of stream associated with this relayd */
 353         unsigned int refcount;
 354
 355         /*
 356          * This flag indicates whether or not we should destroy this object. The
 357          * destruction should ONLY occurs when this flag is set and the refcount is
 358          * set to zero.
 359          */
 360         unsigned int destroy_flag;
 361
 362         /*
 363          * Mutex protecting the control socket to avoid out of order packets
 364          * between threads sending data to the relayd. Since metadata data is sent
 365          * over that socket, at least two sendmsg() are needed (header + data)
 366          * creating a race for packets to overlap between threads using it.
 367          *
 368          * This is nested INSIDE the consumer_data lock.
 369          * This is nested INSIDE the stream lock.
 370          */
 371         pthread_mutex_t ctrl_sock_mutex;
 372
 373         /* Control socket. Command and metadata are passed over it */
 374         struct lttcomm_relayd_sock control_sock;
 375
 376         /*
 377          * We don't need a mutex at this point since we only splice or write single
 378          * large chunk of data with a header appended at the begining. Moreover,
 379          * this socket is for now only used in a single thread.
 380          */
 381         struct lttcomm_relayd_sock data_sock;
 382         struct lttng_ht_node_u64 node;
 383
 384         /* Session id on both sides for the sockets. */
 385         uint64_t relayd_session_id;
 386         uint64_t sessiond_session_id;
 387 };
 388
 389 /*
 390  * UST consumer local data to the program. One or more instance per
 391  * process.
 392  */
 393 struct lttng_consumer_local_data {
 394         /*
 395          * Function to call when data is available on a buffer.
 396          * Returns the number of bytes read, or negative error value.
 397          */
 398         ssize_t (*on_buffer_ready)(struct lttng_consumer_stream *stream,
 399                         struct lttng_consumer_local_data *ctx);
 400         /*
 401          * function to call when we receive a new channel, it receives a
 402          * newly allocated channel, depending on the return code of this
 403          * function, the new channel will be handled by the application
 404          * or the library.
 405          *
 406          * Returns:
 407          *    > 0 (success, FD is kept by application)
 408          *   == 0 (success, FD is left to library)
 409          *    < 0 (error)
 410          */
 411         int (*on_recv_channel)(struct lttng_consumer_channel *channel);
 412         /*
 413          * function to call when we receive a new stream, it receives a
 414          * newly allocated stream, depending on the return code of this
 415          * function, the new stream will be handled by the application
 416          * or the library.
 417          *
 418          * Returns:
 419          *    > 0 (success, FD is kept by application)
 420          *   == 0 (success, FD is left to library)
 421          *    < 0 (error)
 422          */
 423         int (*on_recv_stream)(struct lttng_consumer_stream *stream);
 424         /*
 425          * function to call when a stream is getting updated by the session
 426          * daemon, this function receives the sessiond key and the new
 427          * state, depending on the return code of this function the
 428          * update of state for the stream is handled by the application
 429          * or the library.
 430          *
 431          * Returns:
 432          *    > 0 (success, FD is kept by application)
 433          *   == 0 (success, FD is left to library)
 434          *    < 0 (error)
 435          */
 436         int (*on_update_stream)(uint64_t sessiond_key, uint32_t state);
 437         enum lttng_consumer_type type;
 438         /* socket to communicate errors with sessiond */
 439         int consumer_error_socket;
 440         /* socket to ask metadata to sessiond. */
 441         int consumer_metadata_socket;
 442         /*
 443          * Protect consumer_metadata_socket.
 444          *
 445          * This is nested OUTSIDE the metadata cache lock.
 446          */
 447         pthread_mutex_t metadata_socket_lock;
 448         /* socket to exchange commands with sessiond */
 449         char *consumer_command_sock_path;
 450         /* communication with splice */
 451         int consumer_thread_pipe[2];
 452         int consumer_channel_pipe[2];
 453         int consumer_splice_metadata_pipe[2];
 454         /* Data stream poll thread pipe. To transfer data stream to the thread */
 455         struct lttng_pipe *consumer_data_pipe;
 456         /* to let the signal handler wake up the fd receiver thread */
 457         int consumer_should_quit[2];
 458         /* Metadata poll thread pipe. Transfer metadata stream to it */
 459         struct lttng_pipe *consumer_metadata_pipe;
 460 };
 461
 462 /*
 463  * Library-level data. One instance per process.
 464  */
 465 struct lttng_consumer_global_data {
 466         /*
 467          * At this time, this lock is used to ensure coherence between the count
 468          * and number of element in the hash table. It's also a protection for
 469          * concurrent read/write between threads.
 470          *
 471          * This is nested OUTSIDE the stream lock.
 472          * This is nested OUTSIDE the consumer_relayd_sock_pair lock.
 473          */
 474         pthread_mutex_t lock;
 475
 476         /*
 477          * Number of streams in the data stream hash table declared outside.
 478          * Protected by consumer_data.lock.
 479          */
 480         int stream_count;
 481
 482         /* Channel hash table protected by consumer_data.lock. */
 483         struct lttng_ht *channel_ht;
 484         /*
 485          * Flag specifying if the local array of FDs needs update in the
 486          * poll function. Protected by consumer_data.lock.
 487          */
 488         unsigned int need_update;
 489         enum lttng_consumer_type type;
 490
 491         /*
 492          * Relayd socket(s) hashtable indexed by network sequence number. Each
 493          * stream has an index which associate the right relayd socket to use.
 494          */
 495         struct lttng_ht *relayd_ht;
 496
 497         /*
 498          * This hash table contains all streams (metadata and data) indexed by
 499          * session id. In other words, the ht is indexed by session id and each
 500          * bucket contains the list of associated streams.
 501          *
 502          * This HT uses the "node_session_id" of the consumer stream.
 503          */
 504         struct lttng_ht *stream_list_ht;
 505
 506         /*
 507          * This HT uses the "node_channel_id" of the consumer stream.
 508          */
 509         struct lttng_ht *stream_per_chan_id_ht;
 510 };
 511
 512 /*
 513  * Init consumer data structures.
 514  */
 515 int lttng_consumer_init(void);
 516
 517 /*
 518  * Set the error socket for communication with a session daemon.
 519  */
 520 void lttng_consumer_set_error_sock(struct lttng_consumer_local_data *ctx,
 521                 int sock);
 522
 523 /*
 524  * Set the command socket path for communication with a session daemon.
 525  */
 526 void lttng_consumer_set_command_sock_path(
 527                 struct lttng_consumer_local_data *ctx, char *sock);
 528
 529 /*
 530  * Send return code to session daemon.
 531  *
 532  * Returns the return code of sendmsg : the number of bytes transmitted or -1
 533  * on error.
 534  */
 535 int lttng_consumer_send_error(struct lttng_consumer_local_data *ctx, int cmd);
 536
 537 /*
 538  * Called from signal handler to ensure a clean exit.
 539  */
 540 void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx);
 541
 542 /*
 543  * Cleanup the daemon's socket on exit.
 544  */
 545 void lttng_consumer_cleanup(void);
 546
 547 /*
 548  * Flush pending writes to trace output disk file.
 549  */
 550 void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream,
 551                 off_t orig_offset);
 552
 553 /*
 554  * Poll on the should_quit pipe and the command socket return -1 on error and
 555  * should exit, 0 if data is available on the command socket
 556  */
 557 int lttng_consumer_poll_socket(struct pollfd *kconsumer_sockpoll);
 558
 559 struct lttng_consumer_stream *consumer_allocate_stream(uint64_t channel_key,
 560                 uint64_t stream_key,
 561                 enum lttng_consumer_stream_state state,
 562                 const char *channel_name,
 563                 uid_t uid,
 564                 gid_t gid,
 565                 uint64_t relayd_id,
 566                 uint64_t session_id,
 567                 int cpu,
 568                 int *alloc_ret,
 569                 enum consumer_channel_type type,
 570                 unsigned int monitor);
 571 struct lttng_consumer_channel *consumer_allocate_channel(uint64_t key,
 572                 uint64_t session_id,
 573                 const char *pathname,
 574                 const char *name,
 575                 uid_t uid,
 576                 gid_t gid,
 577                 uint64_t relayd_id,
 578                 enum lttng_event_output output,
 579                 uint64_t tracefile_size,
 580                 uint64_t tracefile_count,
 581                 uint64_t session_id_per_pid,
 582                 unsigned int monitor,
 583                 unsigned int live_timer_interval);
 584 void consumer_del_stream(struct lttng_consumer_stream *stream,
 585                 struct lttng_ht *ht);
 586 void consumer_del_metadata_stream(struct lttng_consumer_stream *stream,
 587                 struct lttng_ht *ht);
 588 int consumer_add_channel(struct lttng_consumer_channel *channel,
 589                 struct lttng_consumer_local_data *ctx);
 590 void consumer_del_channel(struct lttng_consumer_channel *channel);
 591
 592 /* lttng-relayd consumer command */
 593 struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair(
 594                 uint64_t net_seq_idx);
 595 struct consumer_relayd_sock_pair *consumer_find_relayd(uint64_t key);
 596 int consumer_send_relayd_stream(struct lttng_consumer_stream *stream, char *path);
 597 int consumer_send_relayd_streams_sent(uint64_t net_seq_idx);
 598 void close_relayd_stream(struct lttng_consumer_stream *stream);
 599 struct lttng_consumer_channel *consumer_find_channel(uint64_t key);
 600 int consumer_handle_stream_before_relayd(struct lttng_consumer_stream *stream,
 601                 size_t data_size);
 602 void consumer_steal_stream_key(int key, struct lttng_ht *ht);
 603
 604 struct lttng_consumer_local_data *lttng_consumer_create(
 605                 enum lttng_consumer_type type,
 606                 ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream,
 607                         struct lttng_consumer_local_data *ctx),
 608                 int (*recv_channel)(struct lttng_consumer_channel *channel),
 609                 int (*recv_stream)(struct lttng_consumer_stream *stream),
 610                 int (*update_stream)(uint64_t sessiond_key, uint32_t state));
 611 void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx);
 612 ssize_t lttng_consumer_on_read_subbuffer_mmap(
 613                 struct lttng_consumer_local_data *ctx,
 614                 struct lttng_consumer_stream *stream, unsigned long len,
 615                 unsigned long padding,
 616                 struct ctf_packet_index *index);
 617 ssize_t lttng_consumer_on_read_subbuffer_splice(
 618                 struct lttng_consumer_local_data *ctx,
 619                 struct lttng_consumer_stream *stream, unsigned long len,
 620                 unsigned long padding,
 621                 struct ctf_packet_index *index);
 622 int lttng_consumer_take_snapshot(struct lttng_consumer_stream *stream);
 623 int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream *stream,
 624                 unsigned long *pos);
 625 int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream);
 626 int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream);
 627 void *consumer_thread_metadata_poll(void *data);
 628 void *consumer_thread_data_poll(void *data);
 629 void *consumer_thread_sessiond_poll(void *data);
 630 void *consumer_thread_channel_poll(void *data);
 631 int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx,
 632                 int sock, struct pollfd *consumer_sockpoll);
 633
 634 ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream,
 635                 struct lttng_consumer_local_data *ctx);
 636 int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream);
 637 int consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type,
 638                 struct lttng_consumer_local_data *ctx, int sock,
 639                 struct pollfd *consumer_sockpoll, struct lttcomm_relayd_sock *relayd_sock,
 640                 uint64_t sessiond_id, uint64_t relayd_session_id);
 641 void consumer_flag_relayd_for_destroy(
 642                 struct consumer_relayd_sock_pair *relayd);
 643 int consumer_data_pending(uint64_t id);
 644 int consumer_send_status_msg(int sock, int ret_code);
 645 int consumer_send_status_channel(int sock,
 646                 struct lttng_consumer_channel *channel);
 647 void notify_thread_del_channel(struct lttng_consumer_local_data *ctx,
 648                 uint64_t key);
 649 void consumer_destroy_relayd(struct consumer_relayd_sock_pair *relayd);
 650 unsigned long consumer_get_consumed_maxsize(unsigned long consumed_pos,
 651                 unsigned long produced_pos, uint64_t max_stream_size);
 652 int consumer_add_data_stream(struct lttng_consumer_stream *stream);
 653 void consumer_del_stream_for_data(struct lttng_consumer_stream *stream);
 654 int consumer_add_metadata_stream(struct lttng_consumer_stream *stream);
 655 void consumer_del_stream_for_metadata(struct lttng_consumer_stream *stream);
 656 int consumer_create_index_file(struct lttng_consumer_stream *stream);
 657
 658 #endif /* LIB_CONSUMER_H */