2 * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * 2012 - David Goulet <dgoulet@efficios.com>
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.
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
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.
20 #ifndef LIB_CONSUMER_H
21 #define LIB_CONSUMER_H
26 #include <urcu/list.h>
28 #include <lttng/lttng.h>
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/ctf-index.h>
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
, /* deprecated */
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 LTTNG_CONSUMER_STREAMS_SENT
,
61 LTTNG_CONSUMER_DISCARDED_EVENTS
,
62 LTTNG_CONSUMER_LOST_PACKETS
,
63 LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL
,
64 LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE
,
67 /* State of each fd in consumer */
68 enum lttng_consumer_stream_state
{
69 LTTNG_CONSUMER_ACTIVE_STREAM
,
70 LTTNG_CONSUMER_PAUSE_STREAM
,
71 LTTNG_CONSUMER_DELETE_STREAM
,
74 enum lttng_consumer_type
{
75 LTTNG_CONSUMER_UNKNOWN
= 0,
76 LTTNG_CONSUMER_KERNEL
,
81 enum consumer_endpoint_status
{
82 CONSUMER_ENDPOINT_ACTIVE
,
83 CONSUMER_ENDPOINT_INACTIVE
,
86 enum consumer_channel_output
{
87 CONSUMER_CHANNEL_MMAP
= 0,
88 CONSUMER_CHANNEL_SPLICE
= 1,
91 enum consumer_channel_type
{
92 CONSUMER_CHANNEL_TYPE_METADATA
= 0,
93 CONSUMER_CHANNEL_TYPE_DATA
= 1,
96 extern struct lttng_consumer_global_data consumer_data
;
99 struct cds_list_head head
;
104 struct consumer_metadata_cache
;
106 struct lttng_consumer_channel
{
107 /* HT node used for consumer_data.channel_ht */
108 struct lttng_ht_node_u64 node
;
109 /* Indexed key. Incremented value in the consumer. */
111 /* Number of streams referencing this channel */
113 /* Tracing session id on the session daemon side. */
116 * Session id when requesting metadata to the session daemon for
117 * a session with per-PID buffers.
119 uint64_t session_id_per_pid
;
120 /* Channel trace file path name. */
121 char pathname
[PATH_MAX
];
123 char name
[LTTNG_SYMBOL_NAME_LEN
];
124 /* UID and GID of the session owning this channel. */
127 /* Relayd id of the channel. -1ULL if it does not apply. */
130 * Number of streams NOT initialized yet. This is used in order to not
131 * delete this channel if streams are getting initialized.
133 unsigned int nb_init_stream_left
;
134 /* Output type (mmap or splice). */
135 enum consumer_channel_output output
;
136 /* Channel type for stream */
137 enum consumer_channel_type type
;
140 uid_t ust_app_uid
; /* Application UID. */
141 struct ustctl_consumer_channel
*uchan
;
142 unsigned char uuid
[UUID_STR_LEN
];
144 * Temporary stream list used to store the streams once created and waiting
145 * to be sent to the session daemon by receiving the
146 * LTTNG_CONSUMER_GET_CHANNEL.
148 struct stream_list streams
;
151 * Set if the channel is metadata. We keep a reference to the stream
152 * because we have to flush data once pushed by the session daemon. For a
153 * regular channel, this is always set to NULL.
155 struct lttng_consumer_stream
*metadata_stream
;
159 /* Node within channel thread ht */
160 struct lttng_ht_node_u64 wait_fd_node
;
162 /* Metadata cache is metadata channel */
163 struct consumer_metadata_cache
*metadata_cache
;
165 /* For UST metadata periodical flush */
166 int switch_timer_enabled
;
167 timer_t switch_timer
;
168 int switch_timer_error
;
170 /* For the live mode */
171 int live_timer_enabled
;
173 int live_timer_error
;
175 /* For channel monitoring timer. */
176 int monitor_timer_enabled
;
177 timer_t monitor_timer
;
179 /* On-disk circular buffer */
180 uint64_t tracefile_size
;
181 uint64_t tracefile_count
;
183 * Monitor or not the streams of this channel meaning this indicates if the
184 * streams should be sent to the data/metadata thread or added to the no
185 * monitor list of the channel.
187 unsigned int monitor
;
192 * This lock protects against concurrent update of channel.
194 * This is nested INSIDE the consumer data lock.
195 * This is nested OUTSIDE the channel timer lock.
196 * This is nested OUTSIDE the metadata cache lock.
197 * This is nested OUTSIDE stream lock.
198 * This is nested OUTSIDE consumer_relayd_sock_pair lock.
200 pthread_mutex_t lock
;
203 * Channel teardown lock.
205 * This lock protect against teardown of channel. It is _never_
206 * taken by the timer handler.
208 * This is nested INSIDE the consumer data lock.
209 * This is nested INSIDE the channel lock.
210 * This is nested OUTSIDE the metadata cache lock.
211 * This is nested OUTSIDE stream lock.
212 * This is nested OUTSIDE consumer_relayd_sock_pair lock.
214 pthread_mutex_t timer_lock
;
216 /* Timer value in usec for live streaming. */
217 unsigned int live_timer_interval
;
221 char root_shm_path
[PATH_MAX
];
222 char shm_path
[PATH_MAX
];
223 /* Total number of discarded events for that channel. */
224 uint64_t discarded_events
;
225 /* Total number of missed packets due to overwriting (overwrite). */
226 uint64_t lost_packets
;
230 * Internal representation of the streams, sessiond_key is used to identify
233 struct lttng_consumer_stream
{
234 /* HT node used by the data_ht and metadata_ht */
235 struct lttng_ht_node_u64 node
;
236 /* stream indexed per channel key node */
237 struct lttng_ht_node_u64 node_channel_id
;
238 /* HT node used in consumer_data.stream_list_ht */
239 struct lttng_ht_node_u64 node_session_id
;
240 /* Pointer to associated channel. */
241 struct lttng_consumer_channel
*chan
;
243 /* Key by which the stream is indexed for 'node'. */
246 * File descriptor of the data output file. This can be either a file or a
247 * socket fd for relayd streaming.
249 int out_fd
; /* output file to write the data */
250 /* Write position in the output file descriptor */
252 /* Amount of bytes written to the output */
253 uint64_t output_written
;
254 enum lttng_consumer_stream_state state
;
257 int hangup_flush_done
;
260 * Whether the stream is in a "complete" state (e.g. it does not have a
261 * partially written sub-buffer.
263 * Initialized to "false" on stream creation (first packet is empty).
265 * The various transitions of the quiescent state are:
266 * - On "start" tracing: set to false, since the stream is not
268 * - On "stop" tracing: if !quiescent -> flush FINAL (update
269 * timestamp_end), and set to true; the stream has entered a
270 * complete/quiescent state.
271 * - On "destroy" or stream/application hang-up: if !quiescent ->
272 * flush FINAL, and set to true.
274 * NOTE: Update and read are protected by the stream lock.
279 * metadata_timer_lock protects flags waiting_on_metadata and
280 * missed_metadata_flush.
282 pthread_mutex_t metadata_timer_lock
;
284 * Flag set when awaiting metadata to be pushed. Used in the
285 * timer thread to skip waiting on the stream (and stream lock) to
286 * ensure we can proceed to flushing metadata in live mode.
288 bool waiting_on_metadata
;
289 /* Raised when a timer misses a metadata flush. */
290 bool missed_metadata_flush
;
292 enum lttng_event_output output
;
293 /* Maximum subbuffer size. */
294 unsigned long max_sb_size
;
297 * Still used by the kernel for MMAP output. For UST, the ustctl getter is
298 * used for the mmap base and offset.
301 unsigned long mmap_len
;
306 /* UID/GID of the user owning the session to which stream belongs */
309 /* Network sequence number. Indicating on which relayd socket it goes. */
310 uint64_t net_seq_idx
;
312 * Indicate if this stream was successfully sent to a relayd. This is set
313 * after the refcount of the relayd is incremented and is checked when the
314 * stream is closed before decrementing the refcount in order to avoid an
317 unsigned int sent_to_relayd
;
319 /* Identify if the stream is the metadata */
320 unsigned int metadata_flag
;
322 * Last known metadata version, reset the metadata file in case
325 uint64_t metadata_version
;
326 /* Used when the stream is set for network streaming */
327 uint64_t relayd_stream_id
;
329 * When sending a stream packet to a relayd, this number is used to track
330 * the packet sent by the consumer and seen by the relayd. When sending the
331 * data header to the relayd, this number is sent and if the transmission
332 * was successful, it is incremented.
334 * Even if the full data is not fully transmitted it won't matter since
335 * only two possible error can happen after that where either the relayd
336 * died or a read error is detected on the stream making this value useless
339 * This value SHOULD be read/updated atomically or with the lock acquired.
341 uint64_t next_net_seq_num
;
343 * Lock to use the stream FDs since they are used between threads.
345 * This is nested INSIDE the consumer_data lock.
346 * This is nested INSIDE the channel lock.
347 * This is nested INSIDE the channel timer lock.
348 * This is nested OUTSIDE the metadata cache lock.
349 * This is nested OUTSIDE consumer_relayd_sock_pair lock.
351 pthread_mutex_t lock
;
352 /* Tracing session id */
355 * Indicates if the stream end point is still active or not (network
356 * streaming or local file system). The thread "owning" the stream is
357 * handling this status and can be notified of a state change through the
358 * consumer data appropriate pipe.
360 enum consumer_endpoint_status endpoint_status
;
361 /* Stream name. Format is: <channel_name>_<cpu_number> */
362 char name
[LTTNG_SYMBOL_NAME_LEN
];
363 /* Internal state of libustctl. */
364 struct ustctl_consumer_stream
*ustream
;
365 struct cds_list_head send_node
;
366 /* On-disk circular buffer */
367 uint64_t tracefile_size_current
;
368 uint64_t tracefile_count_current
;
370 * Monitor or not the streams of this channel meaning this indicates if the
371 * streams should be sent to the data/metadata thread or added to the no
372 * monitor list of the channel.
374 unsigned int monitor
;
376 * Indicate if the stream is globally visible meaning that it has been
377 * added to the multiple hash tables. If *not* set, NO lock should be
378 * acquired in the destroy path.
380 unsigned int globally_visible
;
382 * Pipe to wake up the metadata poll thread when the UST metadata
385 int ust_metadata_poll_pipe
[2];
387 * How much metadata was read from the metadata cache and sent
390 uint64_t ust_metadata_pushed
;
392 * Copy of the last discarded event value to detect the overflow of
395 uint64_t last_discarded_events
;
396 /* Copy of the sequence number of the last packet extracted. */
397 uint64_t last_sequence_number
;
399 * Index file object of the index file for this stream.
401 struct lttng_index_file
*index_file
;
404 * Local pipe to extract data when using splice.
409 * Rendez-vous point between data and metadata stream in live mode.
411 pthread_cond_t metadata_rdv
;
412 pthread_mutex_t metadata_rdv_lock
;
414 /* Indicate if the stream still has some data to be read. */
415 unsigned int has_data
:1;
417 * Inform the consumer or relay to reset the metadata
418 * file before writing in it (regeneration).
420 unsigned int reset_metadata_flag
:1;
424 * Internal representation of a relayd socket pair.
426 struct consumer_relayd_sock_pair
{
427 /* Network sequence number. */
428 uint64_t net_seq_idx
;
429 /* Number of stream associated with this relayd */
430 unsigned int refcount
;
433 * This flag indicates whether or not we should destroy this object. The
434 * destruction should ONLY occurs when this flag is set and the refcount is
437 unsigned int destroy_flag
;
440 * Mutex protecting the control socket to avoid out of order packets
441 * between threads sending data to the relayd. Since metadata data is sent
442 * over that socket, at least two sendmsg() are needed (header + data)
443 * creating a race for packets to overlap between threads using it.
445 * This is nested INSIDE the consumer_data lock.
446 * This is nested INSIDE the stream lock.
448 pthread_mutex_t ctrl_sock_mutex
;
450 /* Control socket. Command and metadata are passed over it */
451 struct lttcomm_relayd_sock control_sock
;
454 * We don't need a mutex at this point since we only splice or write single
455 * large chunk of data with a header appended at the begining. Moreover,
456 * this socket is for now only used in a single thread.
458 struct lttcomm_relayd_sock data_sock
;
459 struct lttng_ht_node_u64 node
;
461 /* Session id on both sides for the sockets. */
462 uint64_t relayd_session_id
;
463 uint64_t sessiond_session_id
;
467 * UST consumer local data to the program. One or more instance per
470 struct lttng_consumer_local_data
{
472 * Function to call when data is available on a buffer.
473 * Returns the number of bytes read, or negative error value.
475 ssize_t (*on_buffer_ready
)(struct lttng_consumer_stream
*stream
,
476 struct lttng_consumer_local_data
*ctx
);
478 * function to call when we receive a new channel, it receives a
479 * newly allocated channel, depending on the return code of this
480 * function, the new channel will be handled by the application
484 * > 0 (success, FD is kept by application)
485 * == 0 (success, FD is left to library)
488 int (*on_recv_channel
)(struct lttng_consumer_channel
*channel
);
490 * function to call when we receive a new stream, it receives a
491 * newly allocated stream, depending on the return code of this
492 * function, the new stream will be handled by the application
496 * > 0 (success, FD is kept by application)
497 * == 0 (success, FD is left to library)
500 int (*on_recv_stream
)(struct lttng_consumer_stream
*stream
);
502 * function to call when a stream is getting updated by the session
503 * daemon, this function receives the sessiond key and the new
504 * state, depending on the return code of this function the
505 * update of state for the stream is handled by the application
509 * > 0 (success, FD is kept by application)
510 * == 0 (success, FD is left to library)
513 int (*on_update_stream
)(uint64_t sessiond_key
, uint32_t state
);
514 enum lttng_consumer_type type
;
515 /* socket to communicate errors with sessiond */
516 int consumer_error_socket
;
517 /* socket to ask metadata to sessiond. */
518 int consumer_metadata_socket
;
520 * Protect consumer_metadata_socket.
522 * This is nested OUTSIDE the metadata cache lock.
524 pthread_mutex_t metadata_socket_lock
;
525 /* socket to exchange commands with sessiond */
526 char *consumer_command_sock_path
;
527 /* communication with splice */
528 int consumer_channel_pipe
[2];
529 /* Data stream poll thread pipe. To transfer data stream to the thread */
530 struct lttng_pipe
*consumer_data_pipe
;
533 * Data thread use that pipe to catch wakeup from read subbuffer that
534 * detects that there is still data to be read for the stream encountered.
535 * Before doing so, the stream is flagged to indicate that there is still
538 * Both pipes (read/write) are owned and used inside the data thread.
540 struct lttng_pipe
*consumer_wakeup_pipe
;
541 /* Indicate if the wakeup thread has been notified. */
542 unsigned int has_wakeup
:1;
544 /* to let the signal handler wake up the fd receiver thread */
545 int consumer_should_quit
[2];
546 /* Metadata poll thread pipe. Transfer metadata stream to it */
547 struct lttng_pipe
*consumer_metadata_pipe
;
549 * Pipe used by the channel monitoring timers to provide state samples
550 * to the session daemon (write-only).
552 int channel_monitor_pipe
;
556 * Library-level data. One instance per process.
558 struct lttng_consumer_global_data
{
560 * At this time, this lock is used to ensure coherence between the count
561 * and number of element in the hash table. It's also a protection for
562 * concurrent read/write between threads.
564 * This is nested OUTSIDE the stream lock.
565 * This is nested OUTSIDE the consumer_relayd_sock_pair lock.
567 pthread_mutex_t lock
;
570 * Number of streams in the data stream hash table declared outside.
571 * Protected by consumer_data.lock.
575 /* Channel hash table protected by consumer_data.lock. */
576 struct lttng_ht
*channel_ht
;
578 * Flag specifying if the local array of FDs needs update in the
579 * poll function. Protected by consumer_data.lock.
581 unsigned int need_update
;
582 enum lttng_consumer_type type
;
585 * Relayd socket(s) hashtable indexed by network sequence number. Each
586 * stream has an index which associate the right relayd socket to use.
588 struct lttng_ht
*relayd_ht
;
591 * This hash table contains all streams (metadata and data) indexed by
592 * session id. In other words, the ht is indexed by session id and each
593 * bucket contains the list of associated streams.
595 * This HT uses the "node_session_id" of the consumer stream.
597 struct lttng_ht
*stream_list_ht
;
600 * This HT uses the "node_channel_id" of the consumer stream.
602 struct lttng_ht
*stream_per_chan_id_ht
;
605 /* Flag used to temporarily pause data consumption from testpoints. */
606 extern int data_consumption_paused
;
609 * Init consumer data structures.
611 int lttng_consumer_init(void);
614 * Set the error socket for communication with a session daemon.
616 void lttng_consumer_set_error_sock(struct lttng_consumer_local_data
*ctx
,
620 * Set the command socket path for communication with a session daemon.
622 void lttng_consumer_set_command_sock_path(
623 struct lttng_consumer_local_data
*ctx
, char *sock
);
626 * Send return code to session daemon.
628 * Returns the return code of sendmsg : the number of bytes transmitted or -1
631 int lttng_consumer_send_error(struct lttng_consumer_local_data
*ctx
, int cmd
);
634 * Called from signal handler to ensure a clean exit.
636 void lttng_consumer_should_exit(struct lttng_consumer_local_data
*ctx
);
639 * Cleanup the daemon's socket on exit.
641 void lttng_consumer_cleanup(void);
644 * Poll on the should_quit pipe and the command socket return -1 on error and
645 * should exit, 0 if data is available on the command socket
647 int lttng_consumer_poll_socket(struct pollfd
*kconsumer_sockpoll
);
649 struct lttng_consumer_stream
*consumer_allocate_stream(uint64_t channel_key
,
651 enum lttng_consumer_stream_state state
,
652 const char *channel_name
,
659 enum consumer_channel_type type
,
660 unsigned int monitor
);
661 struct lttng_consumer_channel
*consumer_allocate_channel(uint64_t key
,
663 const char *pathname
,
668 enum lttng_event_output output
,
669 uint64_t tracefile_size
,
670 uint64_t tracefile_count
,
671 uint64_t session_id_per_pid
,
672 unsigned int monitor
,
673 unsigned int live_timer_interval
,
674 const char *root_shm_path
,
675 const char *shm_path
);
676 void consumer_del_stream(struct lttng_consumer_stream
*stream
,
677 struct lttng_ht
*ht
);
678 void consumer_del_metadata_stream(struct lttng_consumer_stream
*stream
,
679 struct lttng_ht
*ht
);
680 int consumer_add_channel(struct lttng_consumer_channel
*channel
,
681 struct lttng_consumer_local_data
*ctx
);
682 void consumer_del_channel(struct lttng_consumer_channel
*channel
);
684 /* lttng-relayd consumer command */
685 struct consumer_relayd_sock_pair
*consumer_find_relayd(uint64_t key
);
686 int consumer_send_relayd_stream(struct lttng_consumer_stream
*stream
, char *path
);
687 int consumer_send_relayd_streams_sent(uint64_t net_seq_idx
);
688 void close_relayd_stream(struct lttng_consumer_stream
*stream
);
689 struct lttng_consumer_channel
*consumer_find_channel(uint64_t key
);
690 int consumer_handle_stream_before_relayd(struct lttng_consumer_stream
*stream
,
692 void consumer_steal_stream_key(int key
, struct lttng_ht
*ht
);
694 struct lttng_consumer_local_data
*lttng_consumer_create(
695 enum lttng_consumer_type type
,
696 ssize_t (*buffer_ready
)(struct lttng_consumer_stream
*stream
,
697 struct lttng_consumer_local_data
*ctx
),
698 int (*recv_channel
)(struct lttng_consumer_channel
*channel
),
699 int (*recv_stream
)(struct lttng_consumer_stream
*stream
),
700 int (*update_stream
)(uint64_t sessiond_key
, uint32_t state
));
701 void lttng_consumer_destroy(struct lttng_consumer_local_data
*ctx
);
702 ssize_t
lttng_consumer_on_read_subbuffer_mmap(
703 struct lttng_consumer_local_data
*ctx
,
704 struct lttng_consumer_stream
*stream
, unsigned long len
,
705 unsigned long padding
,
706 struct ctf_packet_index
*index
);
707 ssize_t
lttng_consumer_on_read_subbuffer_splice(
708 struct lttng_consumer_local_data
*ctx
,
709 struct lttng_consumer_stream
*stream
, unsigned long len
,
710 unsigned long padding
,
711 struct ctf_packet_index
*index
);
712 int lttng_consumer_take_snapshot(struct lttng_consumer_stream
*stream
);
713 int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream
*stream
,
715 int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream
*stream
);
716 int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream
*stream
);
717 void *consumer_thread_metadata_poll(void *data
);
718 void *consumer_thread_data_poll(void *data
);
719 void *consumer_thread_sessiond_poll(void *data
);
720 void *consumer_thread_channel_poll(void *data
);
721 int lttng_consumer_recv_cmd(struct lttng_consumer_local_data
*ctx
,
722 int sock
, struct pollfd
*consumer_sockpoll
);
724 ssize_t
lttng_consumer_read_subbuffer(struct lttng_consumer_stream
*stream
,
725 struct lttng_consumer_local_data
*ctx
);
726 int lttng_consumer_on_recv_stream(struct lttng_consumer_stream
*stream
);
727 int consumer_add_relayd_socket(uint64_t net_seq_idx
, int sock_type
,
728 struct lttng_consumer_local_data
*ctx
, int sock
,
729 struct pollfd
*consumer_sockpoll
, struct lttcomm_relayd_sock
*relayd_sock
,
730 uint64_t sessiond_id
, uint64_t relayd_session_id
);
731 void consumer_flag_relayd_for_destroy(
732 struct consumer_relayd_sock_pair
*relayd
);
733 int consumer_data_pending(uint64_t id
);
734 int consumer_send_status_msg(int sock
, int ret_code
);
735 int consumer_send_status_channel(int sock
,
736 struct lttng_consumer_channel
*channel
);
737 void notify_thread_del_channel(struct lttng_consumer_local_data
*ctx
,
739 void consumer_destroy_relayd(struct consumer_relayd_sock_pair
*relayd
);
740 unsigned long consumer_get_consume_start_pos(unsigned long consumed_pos
,
741 unsigned long produced_pos
, uint64_t nb_packets_per_stream
,
742 uint64_t max_sb_size
);
743 int consumer_add_data_stream(struct lttng_consumer_stream
*stream
);
744 void consumer_del_stream_for_data(struct lttng_consumer_stream
*stream
);
745 int consumer_add_metadata_stream(struct lttng_consumer_stream
*stream
);
746 void consumer_del_stream_for_metadata(struct lttng_consumer_stream
*stream
);
747 int consumer_create_index_file(struct lttng_consumer_stream
*stream
);
749 #endif /* LIB_CONSUMER_H */