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