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