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,    /* deprecated */
  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         char shm_path[PATH_MAX];
 211 };
 212
 213 /*
 214  * Internal representation of the streams, sessiond_key is used to identify
 215  * uniquely a stream.
 216  */
 217 struct lttng_consumer_stream {
 218         /* HT node used by the data_ht and metadata_ht */
 219         struct lttng_ht_node_u64 node;
 220         /* stream indexed per channel key node */
 221         struct lttng_ht_node_u64 node_channel_id;
 222         /* HT node used in consumer_data.stream_list_ht */
 223         struct lttng_ht_node_u64 node_session_id;
 224         /* Pointer to associated channel. */
 225         struct lttng_consumer_channel *chan;
 226
 227         /* Key by which the stream is indexed for 'node'. */
 228         uint64_t key;
 229         /*
 230          * File descriptor of the data output file. This can be either a file or a
 231          * socket fd for relayd streaming.
 232          */
 233         int out_fd; /* output file to write the data */
 234         /* Write position in the output file descriptor */
 235         off_t out_fd_offset;
 236         /* Amount of bytes written to the output */
 237         uint64_t output_written;
 238         enum lttng_consumer_stream_state state;
 239         int shm_fd_is_copy;
 240         int data_read;
 241         int hangup_flush_done;
 242         enum lttng_event_output output;
 243         /* Maximum subbuffer size. */
 244         unsigned long max_sb_size;
 245
 246         /*
 247          * Still used by the kernel for MMAP output. For UST, the ustctl getter is
 248          * used for the mmap base and offset.
 249          */
 250         void *mmap_base;
 251         unsigned long mmap_len;
 252
 253         /* For UST */
 254
 255         int wait_fd;
 256         /* UID/GID of the user owning the session to which stream belongs */
 257         uid_t uid;
 258         gid_t gid;
 259         /* Network sequence number. Indicating on which relayd socket it goes. */
 260         uint64_t net_seq_idx;
 261         /*
 262          * Indicate if this stream was successfully sent to a relayd. This is set
 263          * after the refcount of the relayd is incremented and is checked when the
 264          * stream is closed before decrementing the refcount in order to avoid an
 265          * unbalanced state.
 266          */
 267         unsigned int sent_to_relayd;
 268
 269         /* Identify if the stream is the metadata */
 270         unsigned int metadata_flag;
 271         /* Used when the stream is set for network streaming */
 272         uint64_t relayd_stream_id;
 273         /*
 274          * When sending a stream packet to a relayd, this number is used to track
 275          * the packet sent by the consumer and seen by the relayd. When sending the
 276          * data header to the relayd, this number is sent and if the transmission
 277          * was successful, it is incremented.
 278          *
 279          * Even if the full data is not fully transmitted it won't matter since
 280          * only two possible error can happen after that where either the relayd
 281          * died or a read error is detected on the stream making this value useless
 282          * after that.
 283          *
 284          * This value SHOULD be read/updated atomically or with the lock acquired.
 285          */
 286         uint64_t next_net_seq_num;
 287         /*
 288          * Lock to use the stream FDs since they are used between threads.
 289          *
 290          * This is nested INSIDE the consumer_data lock.
 291          * This is nested INSIDE the metadata cache lock.
 292          * This is nested INSIDE the channel lock.
 293          * This is nested INSIDE the channel timer lock.
 294          * This is nested OUTSIDE consumer_relayd_sock_pair lock.
 295          */
 296         pthread_mutex_t lock;
 297         /* Tracing session id */
 298         uint64_t session_id;
 299         /*
 300          * Indicates if the stream end point is still active or not (network
 301          * streaming or local file system). The thread "owning" the stream is
 302          * handling this status and can be notified of a state change through the
 303          * consumer data appropriate pipe.
 304          */
 305         enum consumer_endpoint_status endpoint_status;
 306         /* Stream name. Format is: <channel_name>_<cpu_number> */
 307         char name[LTTNG_SYMBOL_NAME_LEN];
 308         /* Internal state of libustctl. */
 309         struct ustctl_consumer_stream *ustream;
 310         struct cds_list_head send_node;
 311         /* On-disk circular buffer */
 312         uint64_t tracefile_size_current;
 313         uint64_t tracefile_count_current;
 314         /*
 315          * Monitor or not the streams of this channel meaning this indicates if the
 316          * streams should be sent to the data/metadata thread or added to the no
 317          * monitor list of the channel.
 318          */
 319         unsigned int monitor;
 320         /*
 321          * Indicate if the stream is globally visible meaning that it has been
 322          * added to the multiple hash tables. If *not* set, NO lock should be
 323          * acquired in the destroy path.
 324          */
 325         unsigned int globally_visible;
 326         /*
 327          * Pipe to wake up the metadata poll thread when the UST metadata
 328          * cache is updated.
 329          */
 330         int ust_metadata_poll_pipe[2];
 331         /*
 332          * How much metadata was read from the metadata cache and sent
 333          * to the channel.
 334          */
 335         uint64_t ust_metadata_pushed;
 336         /*
 337          * FD of the index file for this stream.
 338          */
 339         int index_fd;
 340
 341         /*
 342          * Local pipe to extract data when using splice.
 343          */
 344         int splice_pipe[2];
 345
 346         /*
 347          * Rendez-vous point between data and metadata stream in live mode.
 348          */
 349         pthread_cond_t metadata_rdv;
 350         pthread_mutex_t metadata_rdv_lock;
 351
 352         /* Indicate if the stream still has some data to be read. */
 353         unsigned int has_data:1;
 354 };
 355
 356 /*
 357  * Internal representation of a relayd socket pair.
 358  */
 359 struct consumer_relayd_sock_pair {
 360         /* Network sequence number. */
 361         uint64_t net_seq_idx;
 362         /* Number of stream associated with this relayd */
 363         unsigned int refcount;
 364
 365         /*
 366          * This flag indicates whether or not we should destroy this object. The
 367          * destruction should ONLY occurs when this flag is set and the refcount is
 368          * set to zero.
 369          */
 370         unsigned int destroy_flag;
 371
 372         /*
 373          * Mutex protecting the control socket to avoid out of order packets
 374          * between threads sending data to the relayd. Since metadata data is sent
 375          * over that socket, at least two sendmsg() are needed (header + data)
 376          * creating a race for packets to overlap between threads using it.
 377          *
 378          * This is nested INSIDE the consumer_data lock.
 379          * This is nested INSIDE the stream lock.
 380          */
 381         pthread_mutex_t ctrl_sock_mutex;
 382
 383         /* Control socket. Command and metadata are passed over it */
 384         struct lttcomm_relayd_sock control_sock;
 385
 386         /*
 387          * We don't need a mutex at this point since we only splice or write single
 388          * large chunk of data with a header appended at the begining. Moreover,
 389          * this socket is for now only used in a single thread.
 390          */
 391         struct lttcomm_relayd_sock data_sock;
 392         struct lttng_ht_node_u64 node;
 393
 394         /* Session id on both sides for the sockets. */
 395         uint64_t relayd_session_id;
 396         uint64_t sessiond_session_id;
 397 };
 398
 399 /*
 400  * UST consumer local data to the program. One or more instance per
 401  * process.
 402  */
 403 struct lttng_consumer_local_data {
 404         /*
 405          * Function to call when data is available on a buffer.
 406          * Returns the number of bytes read, or negative error value.
 407          */
 408         ssize_t (*on_buffer_ready)(struct lttng_consumer_stream *stream,
 409                         struct lttng_consumer_local_data *ctx);
 410         /*
 411          * function to call when we receive a new channel, it receives a
 412          * newly allocated channel, depending on the return code of this
 413          * function, the new channel will be handled by the application
 414          * or the library.
 415          *
 416          * Returns:
 417          *    > 0 (success, FD is kept by application)
 418          *   == 0 (success, FD is left to library)
 419          *    < 0 (error)
 420          */
 421         int (*on_recv_channel)(struct lttng_consumer_channel *channel);
 422         /*
 423          * function to call when we receive a new stream, it receives a
 424          * newly allocated stream, depending on the return code of this
 425          * function, the new stream will be handled by the application
 426          * or the library.
 427          *
 428          * Returns:
 429          *    > 0 (success, FD is kept by application)
 430          *   == 0 (success, FD is left to library)
 431          *    < 0 (error)
 432          */
 433         int (*on_recv_stream)(struct lttng_consumer_stream *stream);
 434         /*
 435          * function to call when a stream is getting updated by the session
 436          * daemon, this function receives the sessiond key and the new
 437          * state, depending on the return code of this function the
 438          * update of state for the stream is handled by the application
 439          * or the library.
 440          *
 441          * Returns:
 442          *    > 0 (success, FD is kept by application)
 443          *   == 0 (success, FD is left to library)
 444          *    < 0 (error)
 445          */
 446         int (*on_update_stream)(uint64_t sessiond_key, uint32_t state);
 447         enum lttng_consumer_type type;
 448         /* socket to communicate errors with sessiond */
 449         int consumer_error_socket;
 450         /* socket to ask metadata to sessiond. */
 451         int consumer_metadata_socket;
 452         /*
 453          * Protect consumer_metadata_socket.
 454          *
 455          * This is nested OUTSIDE the metadata cache lock.
 456          */
 457         pthread_mutex_t metadata_socket_lock;
 458         /* socket to exchange commands with sessiond */
 459         char *consumer_command_sock_path;
 460         /* communication with splice */
 461         int consumer_channel_pipe[2];
 462         /* Data stream poll thread pipe. To transfer data stream to the thread */
 463         struct lttng_pipe *consumer_data_pipe;
 464
 465         /*
 466          * Data thread use that pipe to catch wakeup from read subbuffer that
 467          * detects that there is still data to be read for the stream encountered.
 468          * Before doing so, the stream is flagged to indicate that there is still
 469          * data to be read.
 470          *
 471          * Both pipes (read/write) are owned and used inside the data thread.
 472          */
 473         struct lttng_pipe *consumer_wakeup_pipe;
 474         /* Indicate if the wakeup thread has been notified. */
 475         unsigned int has_wakeup:1;
 476
 477         /* to let the signal handler wake up the fd receiver thread */
 478         int consumer_should_quit[2];
 479         /* Metadata poll thread pipe. Transfer metadata stream to it */
 480         struct lttng_pipe *consumer_metadata_pipe;
 481 };
 482
 483 /*
 484  * Library-level data. One instance per process.
 485  */
 486 struct lttng_consumer_global_data {
 487         /*
 488          * At this time, this lock is used to ensure coherence between the count
 489          * and number of element in the hash table. It's also a protection for
 490          * concurrent read/write between threads.
 491          *
 492          * This is nested OUTSIDE the stream lock.
 493          * This is nested OUTSIDE the consumer_relayd_sock_pair lock.
 494          */
 495         pthread_mutex_t lock;
 496
 497         /*
 498          * Number of streams in the data stream hash table declared outside.
 499          * Protected by consumer_data.lock.
 500          */
 501         int stream_count;
 502
 503         /* Channel hash table protected by consumer_data.lock. */
 504         struct lttng_ht *channel_ht;
 505         /*
 506          * Flag specifying if the local array of FDs needs update in the
 507          * poll function. Protected by consumer_data.lock.
 508          */
 509         unsigned int need_update;
 510         enum lttng_consumer_type type;
 511
 512         /*
 513          * Relayd socket(s) hashtable indexed by network sequence number. Each
 514          * stream has an index which associate the right relayd socket to use.
 515          */
 516         struct lttng_ht *relayd_ht;
 517
 518         /*
 519          * This hash table contains all streams (metadata and data) indexed by
 520          * session id. In other words, the ht is indexed by session id and each
 521          * bucket contains the list of associated streams.
 522          *
 523          * This HT uses the "node_session_id" of the consumer stream.
 524          */
 525         struct lttng_ht *stream_list_ht;
 526
 527         /*
 528          * This HT uses the "node_channel_id" of the consumer stream.
 529          */
 530         struct lttng_ht *stream_per_chan_id_ht;
 531 };
 532
 533 /*
 534  * Init consumer data structures.
 535  */
 536 int lttng_consumer_init(void);
 537
 538 /*
 539  * Set the error socket for communication with a session daemon.
 540  */
 541 void lttng_consumer_set_error_sock(struct lttng_consumer_local_data *ctx,
 542                 int sock);
 543
 544 /*
 545  * Set the command socket path for communication with a session daemon.
 546  */
 547 void lttng_consumer_set_command_sock_path(
 548                 struct lttng_consumer_local_data *ctx, char *sock);
 549
 550 /*
 551  * Send return code to session daemon.
 552  *
 553  * Returns the return code of sendmsg : the number of bytes transmitted or -1
 554  * on error.
 555  */
 556 int lttng_consumer_send_error(struct lttng_consumer_local_data *ctx, int cmd);
 557
 558 /*
 559  * Called from signal handler to ensure a clean exit.
 560  */
 561 void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx);
 562
 563 /*
 564  * Cleanup the daemon's socket on exit.
 565  */
 566 void lttng_consumer_cleanup(void);
 567
 568 /*
 569  * Flush pending writes to trace output disk file.
 570  */
 571 void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream,
 572                 off_t orig_offset);
 573
 574 /*
 575  * Poll on the should_quit pipe and the command socket return -1 on error and
 576  * should exit, 0 if data is available on the command socket
 577  */
 578 int lttng_consumer_poll_socket(struct pollfd *kconsumer_sockpoll);
 579
 580 struct lttng_consumer_stream *consumer_allocate_stream(uint64_t channel_key,
 581                 uint64_t stream_key,
 582                 enum lttng_consumer_stream_state state,
 583                 const char *channel_name,
 584                 uid_t uid,
 585                 gid_t gid,
 586                 uint64_t relayd_id,
 587                 uint64_t session_id,
 588                 int cpu,
 589                 int *alloc_ret,
 590                 enum consumer_channel_type type,
 591                 unsigned int monitor);
 592 struct lttng_consumer_channel *consumer_allocate_channel(uint64_t key,
 593                 uint64_t session_id,
 594                 const char *pathname,
 595                 const char *name,
 596                 uid_t uid,
 597                 gid_t gid,
 598                 uint64_t relayd_id,
 599                 enum lttng_event_output output,
 600                 uint64_t tracefile_size,
 601                 uint64_t tracefile_count,
 602                 uint64_t session_id_per_pid,
 603                 unsigned int monitor,
 604                 unsigned int live_timer_interval,
 605                 const char *shm_path);
 606 void consumer_del_stream(struct lttng_consumer_stream *stream,
 607                 struct lttng_ht *ht);
 608 void consumer_del_metadata_stream(struct lttng_consumer_stream *stream,
 609                 struct lttng_ht *ht);
 610 int consumer_add_channel(struct lttng_consumer_channel *channel,
 611                 struct lttng_consumer_local_data *ctx);
 612 void consumer_del_channel(struct lttng_consumer_channel *channel);
 613
 614 /* lttng-relayd consumer command */
 615 struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair(
 616                 uint64_t net_seq_idx);
 617 struct consumer_relayd_sock_pair *consumer_find_relayd(uint64_t key);
 618 int consumer_send_relayd_stream(struct lttng_consumer_stream *stream, char *path);
 619 int consumer_send_relayd_streams_sent(uint64_t net_seq_idx);
 620 void close_relayd_stream(struct lttng_consumer_stream *stream);
 621 struct lttng_consumer_channel *consumer_find_channel(uint64_t key);
 622 int consumer_handle_stream_before_relayd(struct lttng_consumer_stream *stream,
 623                 size_t data_size);
 624 void consumer_steal_stream_key(int key, struct lttng_ht *ht);
 625
 626 struct lttng_consumer_local_data *lttng_consumer_create(
 627                 enum lttng_consumer_type type,
 628                 ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream,
 629                         struct lttng_consumer_local_data *ctx),
 630                 int (*recv_channel)(struct lttng_consumer_channel *channel),
 631                 int (*recv_stream)(struct lttng_consumer_stream *stream),
 632                 int (*update_stream)(uint64_t sessiond_key, uint32_t state));
 633 void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx);
 634 ssize_t lttng_consumer_on_read_subbuffer_mmap(
 635                 struct lttng_consumer_local_data *ctx,
 636                 struct lttng_consumer_stream *stream, unsigned long len,
 637                 unsigned long padding,
 638                 struct ctf_packet_index *index);
 639 ssize_t lttng_consumer_on_read_subbuffer_splice(
 640                 struct lttng_consumer_local_data *ctx,
 641                 struct lttng_consumer_stream *stream, unsigned long len,
 642                 unsigned long padding,
 643                 struct ctf_packet_index *index);
 644 int lttng_consumer_take_snapshot(struct lttng_consumer_stream *stream);
 645 int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream *stream,
 646                 unsigned long *pos);
 647 int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream);
 648 int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream);
 649 void *consumer_thread_metadata_poll(void *data);
 650 void *consumer_thread_data_poll(void *data);
 651 void *consumer_thread_sessiond_poll(void *data);
 652 void *consumer_thread_channel_poll(void *data);
 653 int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx,
 654                 int sock, struct pollfd *consumer_sockpoll);
 655
 656 ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream,
 657                 struct lttng_consumer_local_data *ctx);
 658 int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream);
 659 int consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type,
 660                 struct lttng_consumer_local_data *ctx, int sock,
 661                 struct pollfd *consumer_sockpoll, struct lttcomm_relayd_sock *relayd_sock,
 662                 uint64_t sessiond_id, uint64_t relayd_session_id);
 663 void consumer_flag_relayd_for_destroy(
 664                 struct consumer_relayd_sock_pair *relayd);
 665 int consumer_data_pending(uint64_t id);
 666 int consumer_send_status_msg(int sock, int ret_code);
 667 int consumer_send_status_channel(int sock,
 668                 struct lttng_consumer_channel *channel);
 669 void notify_thread_del_channel(struct lttng_consumer_local_data *ctx,
 670                 uint64_t key);
 671 void consumer_destroy_relayd(struct consumer_relayd_sock_pair *relayd);
 672 unsigned long consumer_get_consume_start_pos(unsigned long consumed_pos,
 673                 unsigned long produced_pos, uint64_t nb_packets_per_stream,
 674                 uint64_t max_sb_size);
 675 int consumer_add_data_stream(struct lttng_consumer_stream *stream);
 676 void consumer_del_stream_for_data(struct lttng_consumer_stream *stream);
 677 int consumer_add_metadata_stream(struct lttng_consumer_stream *stream);
 678 void consumer_del_stream_for_metadata(struct lttng_consumer_stream *stream);
 679 int consumer_create_index_file(struct lttng_consumer_stream *stream);
 680
 681 #endif /* LIB_CONSUMER_H */