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