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          * Rendez-vous point between data and metadata stream in live mode.
 340          */
 341         pthread_cond_t metadata_rdv;
 342         pthread_mutex_t metadata_rdv_lock;
 343 };
 344
 345 /*
 346  * Internal representation of a relayd socket pair.
 347  */
 348 struct consumer_relayd_sock_pair {
 349         /* Network sequence number. */
 350         uint64_t net_seq_idx;
 351         /* Number of stream associated with this relayd */
 352         unsigned int refcount;
 353
 354         /*
 355          * This flag indicates whether or not we should destroy this object. The
 356          * destruction should ONLY occurs when this flag is set and the refcount is
 357          * set to zero.
 358          */
 359         unsigned int destroy_flag;
 360
 361         /*
 362          * Mutex protecting the control socket to avoid out of order packets
 363          * between threads sending data to the relayd. Since metadata data is sent
 364          * over that socket, at least two sendmsg() are needed (header + data)
 365          * creating a race for packets to overlap between threads using it.
 366          *
 367          * This is nested INSIDE the consumer_data lock.
 368          * This is nested INSIDE the stream lock.
 369          */
 370         pthread_mutex_t ctrl_sock_mutex;
 371
 372         /* Control socket. Command and metadata are passed over it */
 373         struct lttcomm_relayd_sock control_sock;
 374
 375         /*
 376          * We don't need a mutex at this point since we only splice or write single
 377          * large chunk of data with a header appended at the begining. Moreover,
 378          * this socket is for now only used in a single thread.
 379          */
 380         struct lttcomm_relayd_sock data_sock;
 381         struct lttng_ht_node_u64 node;
 382
 383         /* Session id on both sides for the sockets. */
 384         uint64_t relayd_session_id;
 385         uint64_t sessiond_session_id;
 386 };
 387
 388 /*
 389  * UST consumer local data to the program. One or more instance per
 390  * process.
 391  */
 392 struct lttng_consumer_local_data {
 393         /*
 394          * Function to call when data is available on a buffer.
 395          * Returns the number of bytes read, or negative error value.
 396          */
 397         ssize_t (*on_buffer_ready)(struct lttng_consumer_stream *stream,
 398                         struct lttng_consumer_local_data *ctx);
 399         /*
 400          * function to call when we receive a new channel, it receives a
 401          * newly allocated channel, depending on the return code of this
 402          * function, the new channel will be handled by the application
 403          * or the library.
 404          *
 405          * Returns:
 406          *    > 0 (success, FD is kept by application)
 407          *   == 0 (success, FD is left to library)
 408          *    < 0 (error)
 409          */
 410         int (*on_recv_channel)(struct lttng_consumer_channel *channel);
 411         /*
 412          * function to call when we receive a new stream, it receives a
 413          * newly allocated stream, depending on the return code of this
 414          * function, the new stream will be handled by the application
 415          * or the library.
 416          *
 417          * Returns:
 418          *    > 0 (success, FD is kept by application)
 419          *   == 0 (success, FD is left to library)
 420          *    < 0 (error)
 421          */
 422         int (*on_recv_stream)(struct lttng_consumer_stream *stream);
 423         /*
 424          * function to call when a stream is getting updated by the session
 425          * daemon, this function receives the sessiond key and the new
 426          * state, depending on the return code of this function the
 427          * update of state for the stream is handled by the application
 428          * or the library.
 429          *
 430          * Returns:
 431          *    > 0 (success, FD is kept by application)
 432          *   == 0 (success, FD is left to library)
 433          *    < 0 (error)
 434          */
 435         int (*on_update_stream)(uint64_t sessiond_key, uint32_t state);
 436         enum lttng_consumer_type type;
 437         /* socket to communicate errors with sessiond */
 438         int consumer_error_socket;
 439         /* socket to ask metadata to sessiond. */
 440         int consumer_metadata_socket;
 441         /*
 442          * Protect consumer_metadata_socket.
 443          *
 444          * This is nested OUTSIDE the metadata cache lock.
 445          */
 446         pthread_mutex_t metadata_socket_lock;
 447         /* socket to exchange commands with sessiond */
 448         char *consumer_command_sock_path;
 449         /* communication with splice */
 450         int consumer_thread_pipe[2];
 451         int consumer_channel_pipe[2];
 452         int consumer_splice_metadata_pipe[2];
 453         /* Data stream poll thread pipe. To transfer data stream to the thread */
 454         struct lttng_pipe *consumer_data_pipe;
 455         /* to let the signal handler wake up the fd receiver thread */
 456         int consumer_should_quit[2];
 457         /* Metadata poll thread pipe. Transfer metadata stream to it */
 458         struct lttng_pipe *consumer_metadata_pipe;
 459 };
 460
 461 /*
 462  * Library-level data. One instance per process.
 463  */
 464 struct lttng_consumer_global_data {
 465         /*
 466          * At this time, this lock is used to ensure coherence between the count
 467          * and number of element in the hash table. It's also a protection for
 468          * concurrent read/write between threads.
 469          *
 470          * This is nested OUTSIDE the stream lock.
 471          * This is nested OUTSIDE the consumer_relayd_sock_pair lock.
 472          */
 473         pthread_mutex_t lock;
 474
 475         /*
 476          * Number of streams in the data stream hash table declared outside.
 477          * Protected by consumer_data.lock.
 478          */
 479         int stream_count;
 480
 481         /* Channel hash table protected by consumer_data.lock. */
 482         struct lttng_ht *channel_ht;
 483         /*
 484          * Flag specifying if the local array of FDs needs update in the
 485          * poll function. Protected by consumer_data.lock.
 486          */
 487         unsigned int need_update;
 488         enum lttng_consumer_type type;
 489
 490         /*
 491          * Relayd socket(s) hashtable indexed by network sequence number. Each
 492          * stream has an index which associate the right relayd socket to use.
 493          */
 494         struct lttng_ht *relayd_ht;
 495
 496         /*
 497          * This hash table contains all streams (metadata and data) indexed by
 498          * session id. In other words, the ht is indexed by session id and each
 499          * bucket contains the list of associated streams.
 500          *
 501          * This HT uses the "node_session_id" of the consumer stream.
 502          */
 503         struct lttng_ht *stream_list_ht;
 504
 505         /*
 506          * This HT uses the "node_channel_id" of the consumer stream.
 507          */
 508         struct lttng_ht *stream_per_chan_id_ht;
 509 };
 510
 511 /*
 512  * Init consumer data structures.
 513  */
 514 void lttng_consumer_init(void);
 515
 516 /*
 517  * Set the error socket for communication with a session daemon.
 518  */
 519 void lttng_consumer_set_error_sock(struct lttng_consumer_local_data *ctx,
 520                 int sock);
 521
 522 /*
 523  * Set the command socket path for communication with a session daemon.
 524  */
 525 void lttng_consumer_set_command_sock_path(
 526                 struct lttng_consumer_local_data *ctx, char *sock);
 527
 528 /*
 529  * Send return code to session daemon.
 530  *
 531  * Returns the return code of sendmsg : the number of bytes transmitted or -1
 532  * on error.
 533  */
 534 int lttng_consumer_send_error(struct lttng_consumer_local_data *ctx, int cmd);
 535
 536 /*
 537  * Called from signal handler to ensure a clean exit.
 538  */
 539 void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx);
 540
 541 /*
 542  * Cleanup the daemon's socket on exit.
 543  */
 544 void lttng_consumer_cleanup(void);
 545
 546 /*
 547  * Flush pending writes to trace output disk file.
 548  */
 549 void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream,
 550                 off_t orig_offset);
 551
 552 /*
 553  * Poll on the should_quit pipe and the command socket return -1 on error and
 554  * should exit, 0 if data is available on the command socket
 555  */
 556 int lttng_consumer_poll_socket(struct pollfd *kconsumer_sockpoll);
 557
 558 struct lttng_consumer_stream *consumer_allocate_stream(uint64_t channel_key,
 559                 uint64_t stream_key,
 560                 enum lttng_consumer_stream_state state,
 561                 const char *channel_name,
 562                 uid_t uid,
 563                 gid_t gid,
 564                 uint64_t relayd_id,
 565                 uint64_t session_id,
 566                 int cpu,
 567                 int *alloc_ret,
 568                 enum consumer_channel_type type,
 569                 unsigned int monitor);
 570 struct lttng_consumer_channel *consumer_allocate_channel(uint64_t key,
 571                 uint64_t session_id,
 572                 const char *pathname,
 573                 const char *name,
 574                 uid_t uid,
 575                 gid_t gid,
 576                 uint64_t relayd_id,
 577                 enum lttng_event_output output,
 578                 uint64_t tracefile_size,
 579                 uint64_t tracefile_count,
 580                 uint64_t session_id_per_pid,
 581                 unsigned int monitor,
 582                 unsigned int live_timer_interval);
 583 void consumer_del_stream(struct lttng_consumer_stream *stream,
 584                 struct lttng_ht *ht);
 585 void consumer_del_metadata_stream(struct lttng_consumer_stream *stream,
 586                 struct lttng_ht *ht);
 587 int consumer_add_channel(struct lttng_consumer_channel *channel,
 588                 struct lttng_consumer_local_data *ctx);
 589 void consumer_del_channel(struct lttng_consumer_channel *channel);
 590
 591 /* lttng-relayd consumer command */
 592 struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair(
 593                 uint64_t net_seq_idx);
 594 struct consumer_relayd_sock_pair *consumer_find_relayd(uint64_t key);
 595 int consumer_send_relayd_stream(struct lttng_consumer_stream *stream, char *path);
 596 void close_relayd_stream(struct lttng_consumer_stream *stream);
 597 struct lttng_consumer_channel *consumer_find_channel(uint64_t key);
 598 int consumer_handle_stream_before_relayd(struct lttng_consumer_stream *stream,
 599                 size_t data_size);
 600 void consumer_steal_stream_key(int key, struct lttng_ht *ht);
 601
 602 struct lttng_consumer_local_data *lttng_consumer_create(
 603                 enum lttng_consumer_type type,
 604                 ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream,
 605                         struct lttng_consumer_local_data *ctx),
 606                 int (*recv_channel)(struct lttng_consumer_channel *channel),
 607                 int (*recv_stream)(struct lttng_consumer_stream *stream),
 608                 int (*update_stream)(uint64_t sessiond_key, uint32_t state));
 609 void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx);
 610 ssize_t lttng_consumer_on_read_subbuffer_mmap(
 611                 struct lttng_consumer_local_data *ctx,
 612                 struct lttng_consumer_stream *stream, unsigned long len,
 613                 unsigned long padding,
 614                 struct lttng_packet_index *index);
 615 ssize_t lttng_consumer_on_read_subbuffer_splice(
 616                 struct lttng_consumer_local_data *ctx,
 617                 struct lttng_consumer_stream *stream, unsigned long len,
 618                 unsigned long padding,
 619                 struct lttng_packet_index *index);
 620 int lttng_consumer_take_snapshot(struct lttng_consumer_stream *stream);
 621 int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream *stream,
 622                 unsigned long *pos);
 623 void *consumer_thread_metadata_poll(void *data);
 624 void *consumer_thread_data_poll(void *data);
 625 void *consumer_thread_sessiond_poll(void *data);
 626 void *consumer_thread_channel_poll(void *data);
 627 int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx,
 628                 int sock, struct pollfd *consumer_sockpoll);
 629
 630 ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream,
 631                 struct lttng_consumer_local_data *ctx);
 632 int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream);
 633 int consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type,
 634                 struct lttng_consumer_local_data *ctx, int sock,
 635                 struct pollfd *consumer_sockpoll, struct lttcomm_relayd_sock *relayd_sock,
 636                 uint64_t sessiond_id, uint64_t relayd_session_id);
 637 void consumer_flag_relayd_for_destroy(
 638                 struct consumer_relayd_sock_pair *relayd);
 639 int consumer_data_pending(uint64_t id);
 640 int consumer_send_status_msg(int sock, int ret_code);
 641 int consumer_send_status_channel(int sock,
 642                 struct lttng_consumer_channel *channel);
 643 void notify_thread_del_channel(struct lttng_consumer_local_data *ctx,
 644                 uint64_t key);
 645 void consumer_destroy_relayd(struct consumer_relayd_sock_pair *relayd);
 646 unsigned long consumer_get_consumed_maxsize(unsigned long consumed_pos,
 647                 unsigned long produced_pos, uint64_t max_stream_size);
 648 int consumer_add_data_stream(struct lttng_consumer_stream *stream);
 649 void consumer_del_stream_for_data(struct lttng_consumer_stream *stream);
 650 int consumer_add_metadata_stream(struct lttng_consumer_stream *stream);
 651 void consumer_del_stream_for_metadata(struct lttng_consumer_stream *stream);
 652 int consumer_create_index_file(struct lttng_consumer_stream *stream);
 653
 654 #endif /* LIB_CONSUMER_H */