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