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
;
164 /* For UST metadata periodical flush */
165 int switch_timer_enabled
;
166 timer_t switch_timer
;
167 int switch_timer_error
;
169 /* For the live mode */
170 int live_timer_enabled
;
172 int live_timer_error
;
174 /* For channel monitoring timer. */
175 int monitor_timer_enabled
;
176 timer_t monitor_timer
;
178 /* On-disk circular buffer */
179 uint64_t tracefile_size
;
180 uint64_t tracefile_count
;
182 * Monitor or not the streams of this channel meaning this indicates if the
183 * streams should be sent to the data/metadata thread or added to the no
184 * monitor list of the channel.
186 unsigned int monitor
;
191 * This lock protects against concurrent update of channel.
193 * This is nested INSIDE the consumer data lock.
194 * This is nested OUTSIDE the channel timer 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.
199 pthread_mutex_t lock
;
202 * Channel teardown lock.
204 * This lock protect against teardown of channel. It is _never_
205 * taken by the timer handler.
207 * This is nested INSIDE the consumer data lock.
208 * This is nested INSIDE the channel lock.
209 * This is nested OUTSIDE the metadata cache lock.
210 * This is nested OUTSIDE stream lock.
211 * This is nested OUTSIDE consumer_relayd_sock_pair lock.
213 pthread_mutex_t timer_lock
;
215 /* Timer value in usec for live streaming. */
216 unsigned int live_timer_interval
;
220 char root_shm_path
[PATH_MAX
];
221 char shm_path
[PATH_MAX
];
222 /* Total number of discarded events for that channel. */
223 uint64_t discarded_events
;
224 /* Total number of missed packets due to overwriting (overwrite). */
225 uint64_t lost_packets
;
229 * Internal representation of the streams, sessiond_key is used to identify
232 struct lttng_consumer_stream
{
233 /* HT node used by the data_ht and metadata_ht */
234 struct lttng_ht_node_u64 node
;
235 /* stream indexed per channel key node */
236 struct lttng_ht_node_u64 node_channel_id
;
237 /* HT node used in consumer_data.stream_list_ht */
238 struct lttng_ht_node_u64 node_session_id
;
239 /* Pointer to associated channel. */
240 struct lttng_consumer_channel
*chan
;
242 /* Key by which the stream is indexed for 'node'. */
245 * File descriptor of the data output file. This can be either a file or a
246 * socket fd for relayd streaming.
248 int out_fd
; /* output file to write the data */
249 /* Write position in the output file descriptor */
251 /* Amount of bytes written to the output */
252 uint64_t output_written
;
253 enum lttng_consumer_stream_state state
;
256 int hangup_flush_done
;
259 * Whether the stream is in a "complete" state (e.g. it does not have a
260 * partially written sub-buffer.
262 * Initialized to "false" on stream creation (first packet is empty).
264 * The various transitions of the quiescent state are:
265 * - On "start" tracing: set to false, since the stream is not
267 * - On "stop" tracing: if !quiescent -> flush FINAL (update
268 * timestamp_end), and set to true; the stream has entered a
269 * complete/quiescent state.
270 * - On "destroy" or stream/application hang-up: if !quiescent ->
271 * flush FINAL, and set to true.
273 * NOTE: Update and read are protected by the stream lock.
278 * metadata_timer_lock protects flags waiting_on_metadata and
279 * missed_metadata_flush.
281 pthread_mutex_t metadata_timer_lock
;
283 * Flag set when awaiting metadata to be pushed. Used in the
284 * timer thread to skip waiting on the stream (and stream lock) to
285 * ensure we can proceed to flushing metadata in live mode.
287 bool waiting_on_metadata
;
288 /* Raised when a timer misses a metadata flush. */
289 bool missed_metadata_flush
;
291 enum lttng_event_output output
;
292 /* Maximum subbuffer size. */
293 unsigned long max_sb_size
;
296 * Still used by the kernel for MMAP output. For UST, the ustctl getter is
297 * used for the mmap base and offset.
300 unsigned long mmap_len
;
305 /* UID/GID of the user owning the session to which stream belongs */
308 /* Network sequence number. Indicating on which relayd socket it goes. */
309 uint64_t net_seq_idx
;
311 * Indicate if this stream was successfully sent to a relayd. This is set
312 * after the refcount of the relayd is incremented and is checked when the
313 * stream is closed before decrementing the refcount in order to avoid an
316 unsigned int sent_to_relayd
;
318 /* Identify if the stream is the metadata */
319 unsigned int metadata_flag
;
321 * Last known metadata version, reset the metadata file in case
324 uint64_t metadata_version
;
325 /* Used when the stream is set for network streaming */
326 uint64_t relayd_stream_id
;
328 * When sending a stream packet to a relayd, this number is used to track
329 * the packet sent by the consumer and seen by the relayd. When sending the
330 * data header to the relayd, this number is sent and if the transmission
331 * was successful, it is incremented.
333 * Even if the full data is not fully transmitted it won't matter since
334 * only two possible error can happen after that where either the relayd
335 * died or a read error is detected on the stream making this value useless
338 * This value SHOULD be read/updated atomically or with the lock acquired.
340 uint64_t next_net_seq_num
;
342 * Lock to use the stream FDs since they are used between threads.
344 * This is nested INSIDE the consumer_data lock.
345 * This is nested INSIDE the channel lock.
346 * This is nested INSIDE the channel timer lock.
347 * This is nested OUTSIDE the metadata cache lock.
348 * This is nested OUTSIDE consumer_relayd_sock_pair lock.
350 pthread_mutex_t lock
;
351 /* Tracing session id */
354 * Indicates if the stream end point is still active or not (network
355 * streaming or local file system). The thread "owning" the stream is
356 * handling this status and can be notified of a state change through the
357 * consumer data appropriate pipe.
359 enum consumer_endpoint_status endpoint_status
;
360 /* Stream name. Format is: <channel_name>_<cpu_number> */
361 char name
[LTTNG_SYMBOL_NAME_LEN
];
362 /* Internal state of libustctl. */
363 struct ustctl_consumer_stream
*ustream
;
364 struct cds_list_head send_node
;
365 /* On-disk circular buffer */
366 uint64_t tracefile_size_current
;
367 uint64_t tracefile_count_current
;
369 * Monitor or not the streams of this channel meaning this indicates if the
370 * streams should be sent to the data/metadata thread or added to the no
371 * monitor list of the channel.
373 unsigned int monitor
;
375 * Indicate if the stream is globally visible meaning that it has been
376 * added to the multiple hash tables. If *not* set, NO lock should be
377 * acquired in the destroy path.
379 unsigned int globally_visible
;
381 * Pipe to wake up the metadata poll thread when the UST metadata
384 int ust_metadata_poll_pipe
[2];
386 * How much metadata was read from the metadata cache and sent
389 uint64_t ust_metadata_pushed
;
391 * Copy of the last discarded event value to detect the overflow of
394 uint64_t last_discarded_events
;
395 /* Copy of the sequence number of the last packet extracted. */
396 uint64_t last_sequence_number
;
398 * Index file object of the index file for this stream.
400 struct lttng_index_file
*index_file
;
403 * Local pipe to extract data when using splice.
408 * Rendez-vous point between data and metadata stream in live mode.
410 pthread_cond_t metadata_rdv
;
411 pthread_mutex_t metadata_rdv_lock
;
413 /* Indicate if the stream still has some data to be read. */
414 unsigned int has_data
:1;
416 * Inform the consumer or relay to reset the metadata
417 * file before writing in it (regeneration).
419 unsigned int reset_metadata_flag
:1;
423 * Internal representation of a relayd socket pair.
425 struct consumer_relayd_sock_pair
{
426 /* Network sequence number. */
427 uint64_t net_seq_idx
;
428 /* Number of stream associated with this relayd */
429 unsigned int refcount
;
432 * This flag indicates whether or not we should destroy this object. The
433 * destruction should ONLY occurs when this flag is set and the refcount is
436 unsigned int destroy_flag
;
439 * Mutex protecting the control socket to avoid out of order packets
440 * between threads sending data to the relayd. Since metadata data is sent
441 * over that socket, at least two sendmsg() are needed (header + data)
442 * creating a race for packets to overlap between threads using it.
444 * This is nested INSIDE the consumer_data lock.
445 * This is nested INSIDE the stream lock.
447 pthread_mutex_t ctrl_sock_mutex
;
449 /* Control socket. Command and metadata are passed over it */
450 struct lttcomm_relayd_sock control_sock
;
453 * We don't need a mutex at this point since we only splice or write single
454 * large chunk of data with a header appended at the begining. Moreover,
455 * this socket is for now only used in a single thread.
457 struct lttcomm_relayd_sock data_sock
;
458 struct lttng_ht_node_u64 node
;
460 /* Session id on both sides for the sockets. */
461 uint64_t relayd_session_id
;
462 uint64_t sessiond_session_id
;
466 * UST consumer local data to the program. One or more instance per
469 struct lttng_consumer_local_data
{
471 * Function to call when data is available on a buffer.
472 * Returns the number of bytes read, or negative error value.
474 ssize_t (*on_buffer_ready
)(struct lttng_consumer_stream
*stream
,
475 struct lttng_consumer_local_data
*ctx
);
477 * function to call when we receive a new channel, it receives a
478 * newly allocated channel, depending on the return code of this
479 * function, the new channel will be handled by the application
483 * > 0 (success, FD is kept by application)
484 * == 0 (success, FD is left to library)
487 int (*on_recv_channel
)(struct lttng_consumer_channel
*channel
);
489 * function to call when we receive a new stream, it receives a
490 * newly allocated stream, depending on the return code of this
491 * function, the new stream will be handled by the application
495 * > 0 (success, FD is kept by application)
496 * == 0 (success, FD is left to library)
499 int (*on_recv_stream
)(struct lttng_consumer_stream
*stream
);
501 * function to call when a stream is getting updated by the session
502 * daemon, this function receives the sessiond key and the new
503 * state, depending on the return code of this function the
504 * update of state for the stream is handled by the application
508 * > 0 (success, FD is kept by application)
509 * == 0 (success, FD is left to library)
512 int (*on_update_stream
)(uint64_t sessiond_key
, uint32_t state
);
513 enum lttng_consumer_type type
;
514 /* socket to communicate errors with sessiond */
515 int consumer_error_socket
;
516 /* socket to ask metadata to sessiond. */
517 int consumer_metadata_socket
;
519 * Protect consumer_metadata_socket.
521 * This is nested OUTSIDE the metadata cache lock.
523 pthread_mutex_t metadata_socket_lock
;
524 /* socket to exchange commands with sessiond */
525 char *consumer_command_sock_path
;
526 /* communication with splice */
527 int consumer_channel_pipe
[2];
528 /* Data stream poll thread pipe. To transfer data stream to the thread */
529 struct lttng_pipe
*consumer_data_pipe
;
532 * Data thread use that pipe to catch wakeup from read subbuffer that
533 * detects that there is still data to be read for the stream encountered.
534 * Before doing so, the stream is flagged to indicate that there is still
537 * Both pipes (read/write) are owned and used inside the data thread.
539 struct lttng_pipe
*consumer_wakeup_pipe
;
540 /* Indicate if the wakeup thread has been notified. */
541 unsigned int has_wakeup
:1;
543 /* to let the signal handler wake up the fd receiver thread */
544 int consumer_should_quit
[2];
545 /* Metadata poll thread pipe. Transfer metadata stream to it */
546 struct lttng_pipe
*consumer_metadata_pipe
;
548 * Pipe used by the channel monitoring timers to provide state samples
549 * to the session daemon (write-only).
551 int channel_monitor_pipe
;
555 * Library-level data. One instance per process.
557 struct lttng_consumer_global_data
{
559 * At this time, this lock is used to ensure coherence between the count
560 * and number of element in the hash table. It's also a protection for
561 * concurrent read/write between threads.
563 * This is nested OUTSIDE the stream lock.
564 * This is nested OUTSIDE the consumer_relayd_sock_pair lock.
566 pthread_mutex_t lock
;
569 * Number of streams in the data stream hash table declared outside.
570 * Protected by consumer_data.lock.
574 /* Channel hash table protected by consumer_data.lock. */
575 struct lttng_ht
*channel_ht
;
577 * Flag specifying if the local array of FDs needs update in the
578 * poll function. Protected by consumer_data.lock.
580 unsigned int need_update
;
581 enum lttng_consumer_type type
;
584 * Relayd socket(s) hashtable indexed by network sequence number. Each
585 * stream has an index which associate the right relayd socket to use.
587 struct lttng_ht
*relayd_ht
;
590 * This hash table contains all streams (metadata and data) indexed by
591 * session id. In other words, the ht is indexed by session id and each
592 * bucket contains the list of associated streams.
594 * This HT uses the "node_session_id" of the consumer stream.
596 struct lttng_ht
*stream_list_ht
;
599 * This HT uses the "node_channel_id" of the consumer stream.
601 struct lttng_ht
*stream_per_chan_id_ht
;
605 * Init consumer data structures.
607 int lttng_consumer_init(void);
610 * Set the error socket for communication with a session daemon.
612 void lttng_consumer_set_error_sock(struct lttng_consumer_local_data
*ctx
,
616 * Set the command socket path for communication with a session daemon.
618 void lttng_consumer_set_command_sock_path(
619 struct lttng_consumer_local_data
*ctx
, char *sock
);
622 * Send return code to session daemon.
624 * Returns the return code of sendmsg : the number of bytes transmitted or -1
627 int lttng_consumer_send_error(struct lttng_consumer_local_data
*ctx
, int cmd
);
630 * Called from signal handler to ensure a clean exit.
632 void lttng_consumer_should_exit(struct lttng_consumer_local_data
*ctx
);
635 * Cleanup the daemon's socket on exit.
637 void lttng_consumer_cleanup(void);
640 * Poll on the should_quit pipe and the command socket return -1 on error and
641 * should exit, 0 if data is available on the command socket
643 int lttng_consumer_poll_socket(struct pollfd
*kconsumer_sockpoll
);
645 struct lttng_consumer_stream
*consumer_allocate_stream(uint64_t channel_key
,
647 enum lttng_consumer_stream_state state
,
648 const char *channel_name
,
655 enum consumer_channel_type type
,
656 unsigned int monitor
);
657 struct lttng_consumer_channel
*consumer_allocate_channel(uint64_t key
,
659 const char *pathname
,
664 enum lttng_event_output output
,
665 uint64_t tracefile_size
,
666 uint64_t tracefile_count
,
667 uint64_t session_id_per_pid
,
668 unsigned int monitor
,
669 unsigned int live_timer_interval
,
670 const char *root_shm_path
,
671 const char *shm_path
);
672 void consumer_del_stream(struct lttng_consumer_stream
*stream
,
673 struct lttng_ht
*ht
);
674 void consumer_del_metadata_stream(struct lttng_consumer_stream
*stream
,
675 struct lttng_ht
*ht
);
676 int consumer_add_channel(struct lttng_consumer_channel
*channel
,
677 struct lttng_consumer_local_data
*ctx
);
678 void consumer_del_channel(struct lttng_consumer_channel
*channel
);
680 /* lttng-relayd consumer command */
681 struct consumer_relayd_sock_pair
*consumer_find_relayd(uint64_t key
);
682 int consumer_send_relayd_stream(struct lttng_consumer_stream
*stream
, char *path
);
683 int consumer_send_relayd_streams_sent(uint64_t net_seq_idx
);
684 void close_relayd_stream(struct lttng_consumer_stream
*stream
);
685 struct lttng_consumer_channel
*consumer_find_channel(uint64_t key
);
686 int consumer_handle_stream_before_relayd(struct lttng_consumer_stream
*stream
,
688 void consumer_steal_stream_key(int key
, struct lttng_ht
*ht
);
690 struct lttng_consumer_local_data
*lttng_consumer_create(
691 enum lttng_consumer_type type
,
692 ssize_t (*buffer_ready
)(struct lttng_consumer_stream
*stream
,
693 struct lttng_consumer_local_data
*ctx
),
694 int (*recv_channel
)(struct lttng_consumer_channel
*channel
),
695 int (*recv_stream
)(struct lttng_consumer_stream
*stream
),
696 int (*update_stream
)(uint64_t sessiond_key
, uint32_t state
));
697 void lttng_consumer_destroy(struct lttng_consumer_local_data
*ctx
);
698 ssize_t
lttng_consumer_on_read_subbuffer_mmap(
699 struct lttng_consumer_local_data
*ctx
,
700 struct lttng_consumer_stream
*stream
, unsigned long len
,
701 unsigned long padding
,
702 struct ctf_packet_index
*index
);
703 ssize_t
lttng_consumer_on_read_subbuffer_splice(
704 struct lttng_consumer_local_data
*ctx
,
705 struct lttng_consumer_stream
*stream
, unsigned long len
,
706 unsigned long padding
,
707 struct ctf_packet_index
*index
);
708 int lttng_consumer_take_snapshot(struct lttng_consumer_stream
*stream
);
709 int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream
*stream
,
711 int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream
*stream
);
712 int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream
*stream
);
713 void *consumer_thread_metadata_poll(void *data
);
714 void *consumer_thread_data_poll(void *data
);
715 void *consumer_thread_sessiond_poll(void *data
);
716 void *consumer_thread_channel_poll(void *data
);
717 int lttng_consumer_recv_cmd(struct lttng_consumer_local_data
*ctx
,
718 int sock
, struct pollfd
*consumer_sockpoll
);
720 ssize_t
lttng_consumer_read_subbuffer(struct lttng_consumer_stream
*stream
,
721 struct lttng_consumer_local_data
*ctx
);
722 int lttng_consumer_on_recv_stream(struct lttng_consumer_stream
*stream
);
723 int consumer_add_relayd_socket(uint64_t net_seq_idx
, int sock_type
,
724 struct lttng_consumer_local_data
*ctx
, int sock
,
725 struct pollfd
*consumer_sockpoll
, struct lttcomm_relayd_sock
*relayd_sock
,
726 uint64_t sessiond_id
, uint64_t relayd_session_id
);
727 void consumer_flag_relayd_for_destroy(
728 struct consumer_relayd_sock_pair
*relayd
);
729 int consumer_data_pending(uint64_t id
);
730 int consumer_send_status_msg(int sock
, int ret_code
);
731 int consumer_send_status_channel(int sock
,
732 struct lttng_consumer_channel
*channel
);
733 void notify_thread_del_channel(struct lttng_consumer_local_data
*ctx
,
735 void consumer_destroy_relayd(struct consumer_relayd_sock_pair
*relayd
);
736 unsigned long consumer_get_consume_start_pos(unsigned long consumed_pos
,
737 unsigned long produced_pos
, uint64_t nb_packets_per_stream
,
738 uint64_t max_sb_size
);
739 int consumer_add_data_stream(struct lttng_consumer_stream
*stream
);
740 void consumer_del_stream_for_data(struct lttng_consumer_stream
*stream
);
741 int consumer_add_metadata_stream(struct lttng_consumer_stream
*stream
);
742 void consumer_del_stream_for_metadata(struct lttng_consumer_stream
*stream
);
743 int consumer_create_index_file(struct lttng_consumer_stream
*stream
);
745 #endif /* LIB_CONSUMER_H */