7485e65b259d4b855c301405425225a462b5e0bf
[lttng-tools.git] / 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/ctf-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, /* 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 };
62
63 /* State of each fd in consumer */
64 enum lttng_consumer_stream_state {
65 LTTNG_CONSUMER_ACTIVE_STREAM,
66 LTTNG_CONSUMER_PAUSE_STREAM,
67 LTTNG_CONSUMER_DELETE_STREAM,
68 };
69
70 enum lttng_consumer_type {
71 LTTNG_CONSUMER_UNKNOWN = 0,
72 LTTNG_CONSUMER_KERNEL,
73 LTTNG_CONSUMER64_UST,
74 LTTNG_CONSUMER32_UST,
75 };
76
77 enum consumer_endpoint_status {
78 CONSUMER_ENDPOINT_ACTIVE,
79 CONSUMER_ENDPOINT_INACTIVE,
80 };
81
82 enum consumer_channel_output {
83 CONSUMER_CHANNEL_MMAP = 0,
84 CONSUMER_CHANNEL_SPLICE = 1,
85 };
86
87 enum consumer_channel_type {
88 CONSUMER_CHANNEL_TYPE_METADATA = 0,
89 CONSUMER_CHANNEL_TYPE_DATA = 1,
90 };
91
92 extern struct lttng_consumer_global_data consumer_data;
93
94 struct stream_list {
95 struct cds_list_head head;
96 unsigned int count;
97 };
98
99 /* Stub. */
100 struct consumer_metadata_cache;
101
102 struct lttng_consumer_channel {
103 /* HT node used for consumer_data.channel_ht */
104 struct lttng_ht_node_u64 node;
105 /* Indexed key. Incremented value in the consumer. */
106 uint64_t key;
107 /* Number of streams referencing this channel */
108 int refcount;
109 /* Tracing session id on the session daemon side. */
110 uint64_t session_id;
111 /*
112 * Session id when requesting metadata to the session daemon for
113 * a session with per-PID buffers.
114 */
115 uint64_t session_id_per_pid;
116 /* Channel trace file path name. */
117 char pathname[PATH_MAX];
118 /* Channel name. */
119 char name[LTTNG_SYMBOL_NAME_LEN];
120 /* UID and GID of the session owning this channel. */
121 uid_t uid;
122 gid_t gid;
123 /* Relayd id of the channel. -1ULL if it does not apply. */
124 uint64_t relayd_id;
125 /*
126 * Number of streams NOT initialized yet. This is used in order to not
127 * delete this channel if streams are getting initialized.
128 */
129 unsigned int nb_init_stream_left;
130 /* Output type (mmap or splice). */
131 enum consumer_channel_output output;
132 /* Channel type for stream */
133 enum consumer_channel_type type;
134
135 /* For UST */
136 uid_t ust_app_uid; /* Application UID. */
137 struct ustctl_consumer_channel *uchan;
138 unsigned char uuid[UUID_STR_LEN];
139 /*
140 * Temporary stream list used to store the streams once created and waiting
141 * to be sent to the session daemon by receiving the
142 * LTTNG_CONSUMER_GET_CHANNEL.
143 */
144 struct stream_list streams;
145
146 /*
147 * Set if the channel is metadata. We keep a reference to the stream
148 * because we have to flush data once pushed by the session daemon. For a
149 * regular channel, this is always set to NULL.
150 */
151 struct lttng_consumer_stream *metadata_stream;
152
153 /* for UST */
154 int wait_fd;
155 /* Node within channel thread ht */
156 struct lttng_ht_node_u64 wait_fd_node;
157
158 /* Metadata cache is metadata channel */
159 struct consumer_metadata_cache *metadata_cache;
160 /* For UST metadata periodical flush */
161 int switch_timer_enabled;
162 timer_t switch_timer;
163 int switch_timer_error;
164
165 /* For the live mode */
166 int live_timer_enabled;
167 timer_t live_timer;
168 int live_timer_error;
169
170 /* On-disk circular buffer */
171 uint64_t tracefile_size;
172 uint64_t tracefile_count;
173 /*
174 * Monitor or not the streams of this channel meaning this indicates if the
175 * streams should be sent to the data/metadata thread or added to the no
176 * monitor list of the channel.
177 */
178 unsigned int monitor;
179
180 /*
181 * Channel lock.
182 *
183 * This lock protects against concurrent update of channel.
184 *
185 * This is nested INSIDE the consumer data lock.
186 * This is nested OUTSIDE the channel timer lock.
187 * This is nested OUTSIDE the metadata cache lock.
188 * This is nested OUTSIDE stream lock.
189 * This is nested OUTSIDE consumer_relayd_sock_pair lock.
190 */
191 pthread_mutex_t lock;
192
193 /*
194 * Channel teardown lock.
195 *
196 * This lock protect against teardown of channel. It is _never_
197 * taken by the timer handler.
198 *
199 * This is nested INSIDE the consumer data lock.
200 * This is nested INSIDE the channel lock.
201 * This is nested OUTSIDE the metadata cache lock.
202 * This is nested OUTSIDE stream lock.
203 * This is nested OUTSIDE consumer_relayd_sock_pair lock.
204 */
205 pthread_mutex_t timer_lock;
206
207 /* Timer value in usec for live streaming. */
208 unsigned int live_timer_interval;
209 };
210
211 /*
212 * Internal representation of the streams, sessiond_key is used to identify
213 * uniquely a stream.
214 */
215 struct lttng_consumer_stream {
216 /* HT node used by the data_ht and metadata_ht */
217 struct lttng_ht_node_u64 node;
218 /* stream indexed per channel key node */
219 struct lttng_ht_node_u64 node_channel_id;
220 /* HT node used in consumer_data.stream_list_ht */
221 struct lttng_ht_node_u64 node_session_id;
222 /* Pointer to associated channel. */
223 struct lttng_consumer_channel *chan;
224
225 /* Key by which the stream is indexed for 'node'. */
226 uint64_t key;
227 /*
228 * File descriptor of the data output file. This can be either a file or a
229 * socket fd for relayd streaming.
230 */
231 int out_fd; /* output file to write the data */
232 /* Write position in the output file descriptor */
233 off_t out_fd_offset;
234 /* Amount of bytes written to the output */
235 uint64_t output_written;
236 enum lttng_consumer_stream_state state;
237 int shm_fd_is_copy;
238 int data_read;
239 int hangup_flush_done;
240 enum lttng_event_output output;
241 /* Maximum subbuffer size. */
242 unsigned long max_sb_size;
243
244 /*
245 * Still used by the kernel for MMAP output. For UST, the ustctl getter is
246 * used for the mmap base and offset.
247 */
248 void *mmap_base;
249 unsigned long mmap_len;
250
251 /* For UST */
252
253 int wait_fd;
254 /* UID/GID of the user owning the session to which stream belongs */
255 uid_t uid;
256 gid_t gid;
257 /* Network sequence number. Indicating on which relayd socket it goes. */
258 uint64_t net_seq_idx;
259 /*
260 * Indicate if this stream was successfully sent to a relayd. This is set
261 * after the refcount of the relayd is incremented and is checked when the
262 * stream is closed before decrementing the refcount in order to avoid an
263 * unbalanced state.
264 */
265 unsigned int sent_to_relayd;
266
267 /* Identify if the stream is the metadata */
268 unsigned int metadata_flag;
269 /* Used when the stream is set for network streaming */
270 uint64_t relayd_stream_id;
271 /*
272 * When sending a stream packet to a relayd, this number is used to track
273 * the packet sent by the consumer and seen by the relayd. When sending the
274 * data header to the relayd, this number is sent and if the transmission
275 * was successful, it is incremented.
276 *
277 * Even if the full data is not fully transmitted it won't matter since
278 * only two possible error can happen after that where either the relayd
279 * died or a read error is detected on the stream making this value useless
280 * after that.
281 *
282 * This value SHOULD be read/updated atomically or with the lock acquired.
283 */
284 uint64_t next_net_seq_num;
285 /*
286 * Lock to use the stream FDs since they are used between threads.
287 *
288 * This is nested INSIDE the consumer_data lock.
289 * This is nested INSIDE the metadata cache lock.
290 * This is nested INSIDE the channel lock.
291 * This is nested INSIDE the channel timer lock.
292 * This is nested OUTSIDE consumer_relayd_sock_pair lock.
293 */
294 pthread_mutex_t lock;
295 /* Tracing session id */
296 uint64_t session_id;
297 /*
298 * Indicates if the stream end point is still active or not (network
299 * streaming or local file system). The thread "owning" the stream is
300 * handling this status and can be notified of a state change through the
301 * consumer data appropriate pipe.
302 */
303 enum consumer_endpoint_status endpoint_status;
304 /* Stream name. Format is: <channel_name>_<cpu_number> */
305 char name[LTTNG_SYMBOL_NAME_LEN];
306 /* Internal state of libustctl. */
307 struct ustctl_consumer_stream *ustream;
308 struct cds_list_head send_node;
309 /* On-disk circular buffer */
310 uint64_t tracefile_size_current;
311 uint64_t tracefile_count_current;
312 /*
313 * Monitor or not the streams of this channel meaning this indicates if the
314 * streams should be sent to the data/metadata thread or added to the no
315 * monitor list of the channel.
316 */
317 unsigned int monitor;
318 /*
319 * Indicate if the stream is globally visible meaning that it has been
320 * added to the multiple hash tables. If *not* set, NO lock should be
321 * acquired in the destroy path.
322 */
323 unsigned int globally_visible;
324 /*
325 * Pipe to wake up the metadata poll thread when the UST metadata
326 * cache is updated.
327 */
328 int ust_metadata_poll_pipe[2];
329 /*
330 * How much metadata was read from the metadata cache and sent
331 * to the channel.
332 */
333 uint64_t ust_metadata_pushed;
334 /*
335 * FD of the index file for this stream.
336 */
337 int index_fd;
338
339 /*
340 * Rendez-vous point between data and metadata stream in live mode.
341 */
342 pthread_cond_t metadata_rdv;
343 pthread_mutex_t metadata_rdv_lock;
344 };
345
346 /*
347 * Internal representation of a relayd socket pair.
348 */
349 struct consumer_relayd_sock_pair {
350 /* Network sequence number. */
351 uint64_t net_seq_idx;
352 /* Number of stream associated with this relayd */
353 unsigned int refcount;
354
355 /*
356 * This flag indicates whether or not we should destroy this object. The
357 * destruction should ONLY occurs when this flag is set and the refcount is
358 * set to zero.
359 */
360 unsigned int destroy_flag;
361
362 /*
363 * Mutex protecting the control socket to avoid out of order packets
364 * between threads sending data to the relayd. Since metadata data is sent
365 * over that socket, at least two sendmsg() are needed (header + data)
366 * creating a race for packets to overlap between threads using it.
367 *
368 * This is nested INSIDE the consumer_data lock.
369 * This is nested INSIDE the stream lock.
370 */
371 pthread_mutex_t ctrl_sock_mutex;
372
373 /* Control socket. Command and metadata are passed over it */
374 struct lttcomm_relayd_sock control_sock;
375
376 /*
377 * We don't need a mutex at this point since we only splice or write single
378 * large chunk of data with a header appended at the begining. Moreover,
379 * this socket is for now only used in a single thread.
380 */
381 struct lttcomm_relayd_sock data_sock;
382 struct lttng_ht_node_u64 node;
383
384 /* Session id on both sides for the sockets. */
385 uint64_t relayd_session_id;
386 uint64_t sessiond_session_id;
387 };
388
389 /*
390 * UST consumer local data to the program. One or more instance per
391 * process.
392 */
393 struct lttng_consumer_local_data {
394 /*
395 * Function to call when data is available on a buffer.
396 * Returns the number of bytes read, or negative error value.
397 */
398 ssize_t (*on_buffer_ready)(struct lttng_consumer_stream *stream,
399 struct lttng_consumer_local_data *ctx);
400 /*
401 * function to call when we receive a new channel, it receives a
402 * newly allocated channel, depending on the return code of this
403 * function, the new channel will be handled by the application
404 * or the library.
405 *
406 * Returns:
407 * > 0 (success, FD is kept by application)
408 * == 0 (success, FD is left to library)
409 * < 0 (error)
410 */
411 int (*on_recv_channel)(struct lttng_consumer_channel *channel);
412 /*
413 * function to call when we receive a new stream, it receives a
414 * newly allocated stream, depending on the return code of this
415 * function, the new stream will be handled by the application
416 * or the library.
417 *
418 * Returns:
419 * > 0 (success, FD is kept by application)
420 * == 0 (success, FD is left to library)
421 * < 0 (error)
422 */
423 int (*on_recv_stream)(struct lttng_consumer_stream *stream);
424 /*
425 * function to call when a stream is getting updated by the session
426 * daemon, this function receives the sessiond key and the new
427 * state, depending on the return code of this function the
428 * update of state for the stream is handled by the application
429 * or the library.
430 *
431 * Returns:
432 * > 0 (success, FD is kept by application)
433 * == 0 (success, FD is left to library)
434 * < 0 (error)
435 */
436 int (*on_update_stream)(uint64_t sessiond_key, uint32_t state);
437 enum lttng_consumer_type type;
438 /* socket to communicate errors with sessiond */
439 int consumer_error_socket;
440 /* socket to ask metadata to sessiond. */
441 int consumer_metadata_socket;
442 /*
443 * Protect consumer_metadata_socket.
444 *
445 * This is nested OUTSIDE the metadata cache lock.
446 */
447 pthread_mutex_t metadata_socket_lock;
448 /* socket to exchange commands with sessiond */
449 char *consumer_command_sock_path;
450 /* communication with splice */
451 int consumer_thread_pipe[2];
452 int consumer_channel_pipe[2];
453 int consumer_splice_metadata_pipe[2];
454 /* Data stream poll thread pipe. To transfer data stream to the thread */
455 struct lttng_pipe *consumer_data_pipe;
456 /* to let the signal handler wake up the fd receiver thread */
457 int consumer_should_quit[2];
458 /* Metadata poll thread pipe. Transfer metadata stream to it */
459 struct lttng_pipe *consumer_metadata_pipe;
460 };
461
462 /*
463 * Library-level data. One instance per process.
464 */
465 struct lttng_consumer_global_data {
466 /*
467 * At this time, this lock is used to ensure coherence between the count
468 * and number of element in the hash table. It's also a protection for
469 * concurrent read/write between threads.
470 *
471 * This is nested OUTSIDE the stream lock.
472 * This is nested OUTSIDE the consumer_relayd_sock_pair lock.
473 */
474 pthread_mutex_t lock;
475
476 /*
477 * Number of streams in the data stream hash table declared outside.
478 * Protected by consumer_data.lock.
479 */
480 int stream_count;
481
482 /* Channel hash table protected by consumer_data.lock. */
483 struct lttng_ht *channel_ht;
484 /*
485 * Flag specifying if the local array of FDs needs update in the
486 * poll function. Protected by consumer_data.lock.
487 */
488 unsigned int need_update;
489 enum lttng_consumer_type type;
490
491 /*
492 * Relayd socket(s) hashtable indexed by network sequence number. Each
493 * stream has an index which associate the right relayd socket to use.
494 */
495 struct lttng_ht *relayd_ht;
496
497 /*
498 * This hash table contains all streams (metadata and data) indexed by
499 * session id. In other words, the ht is indexed by session id and each
500 * bucket contains the list of associated streams.
501 *
502 * This HT uses the "node_session_id" of the consumer stream.
503 */
504 struct lttng_ht *stream_list_ht;
505
506 /*
507 * This HT uses the "node_channel_id" of the consumer stream.
508 */
509 struct lttng_ht *stream_per_chan_id_ht;
510 };
511
512 /*
513 * Init consumer data structures.
514 */
515 int lttng_consumer_init(void);
516
517 /*
518 * Set the error socket for communication with a session daemon.
519 */
520 void lttng_consumer_set_error_sock(struct lttng_consumer_local_data *ctx,
521 int sock);
522
523 /*
524 * Set the command socket path for communication with a session daemon.
525 */
526 void lttng_consumer_set_command_sock_path(
527 struct lttng_consumer_local_data *ctx, char *sock);
528
529 /*
530 * Send return code to session daemon.
531 *
532 * Returns the return code of sendmsg : the number of bytes transmitted or -1
533 * on error.
534 */
535 int lttng_consumer_send_error(struct lttng_consumer_local_data *ctx, int cmd);
536
537 /*
538 * Called from signal handler to ensure a clean exit.
539 */
540 void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx);
541
542 /*
543 * Cleanup the daemon's socket on exit.
544 */
545 void lttng_consumer_cleanup(void);
546
547 /*
548 * Flush pending writes to trace output disk file.
549 */
550 void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream,
551 off_t orig_offset);
552
553 /*
554 * Poll on the should_quit pipe and the command socket return -1 on error and
555 * should exit, 0 if data is available on the command socket
556 */
557 int lttng_consumer_poll_socket(struct pollfd *kconsumer_sockpoll);
558
559 struct lttng_consumer_stream *consumer_allocate_stream(uint64_t channel_key,
560 uint64_t stream_key,
561 enum lttng_consumer_stream_state state,
562 const char *channel_name,
563 uid_t uid,
564 gid_t gid,
565 uint64_t relayd_id,
566 uint64_t session_id,
567 int cpu,
568 int *alloc_ret,
569 enum consumer_channel_type type,
570 unsigned int monitor);
571 struct lttng_consumer_channel *consumer_allocate_channel(uint64_t key,
572 uint64_t session_id,
573 const char *pathname,
574 const char *name,
575 uid_t uid,
576 gid_t gid,
577 uint64_t relayd_id,
578 enum lttng_event_output output,
579 uint64_t tracefile_size,
580 uint64_t tracefile_count,
581 uint64_t session_id_per_pid,
582 unsigned int monitor,
583 unsigned int live_timer_interval);
584 void consumer_del_stream(struct lttng_consumer_stream *stream,
585 struct lttng_ht *ht);
586 void consumer_del_metadata_stream(struct lttng_consumer_stream *stream,
587 struct lttng_ht *ht);
588 int consumer_add_channel(struct lttng_consumer_channel *channel,
589 struct lttng_consumer_local_data *ctx);
590 void consumer_del_channel(struct lttng_consumer_channel *channel);
591
592 /* lttng-relayd consumer command */
593 struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair(
594 uint64_t net_seq_idx);
595 struct consumer_relayd_sock_pair *consumer_find_relayd(uint64_t key);
596 int consumer_send_relayd_stream(struct lttng_consumer_stream *stream, char *path);
597 int consumer_send_relayd_streams_sent(uint64_t net_seq_idx);
598 void close_relayd_stream(struct lttng_consumer_stream *stream);
599 struct lttng_consumer_channel *consumer_find_channel(uint64_t key);
600 int consumer_handle_stream_before_relayd(struct lttng_consumer_stream *stream,
601 size_t data_size);
602 void consumer_steal_stream_key(int key, struct lttng_ht *ht);
603
604 struct lttng_consumer_local_data *lttng_consumer_create(
605 enum lttng_consumer_type type,
606 ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream,
607 struct lttng_consumer_local_data *ctx),
608 int (*recv_channel)(struct lttng_consumer_channel *channel),
609 int (*recv_stream)(struct lttng_consumer_stream *stream),
610 int (*update_stream)(uint64_t sessiond_key, uint32_t state));
611 void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx);
612 ssize_t lttng_consumer_on_read_subbuffer_mmap(
613 struct lttng_consumer_local_data *ctx,
614 struct lttng_consumer_stream *stream, unsigned long len,
615 unsigned long padding,
616 struct ctf_packet_index *index);
617 ssize_t lttng_consumer_on_read_subbuffer_splice(
618 struct lttng_consumer_local_data *ctx,
619 struct lttng_consumer_stream *stream, unsigned long len,
620 unsigned long padding,
621 struct ctf_packet_index *index);
622 int lttng_consumer_take_snapshot(struct lttng_consumer_stream *stream);
623 int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream *stream,
624 unsigned long *pos);
625 int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream);
626 int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream);
627 void *consumer_thread_metadata_poll(void *data);
628 void *consumer_thread_data_poll(void *data);
629 void *consumer_thread_sessiond_poll(void *data);
630 void *consumer_thread_channel_poll(void *data);
631 int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx,
632 int sock, struct pollfd *consumer_sockpoll);
633
634 ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream,
635 struct lttng_consumer_local_data *ctx);
636 int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream);
637 int consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type,
638 struct lttng_consumer_local_data *ctx, int sock,
639 struct pollfd *consumer_sockpoll, struct lttcomm_relayd_sock *relayd_sock,
640 uint64_t sessiond_id, uint64_t relayd_session_id);
641 void consumer_flag_relayd_for_destroy(
642 struct consumer_relayd_sock_pair *relayd);
643 int consumer_data_pending(uint64_t id);
644 int consumer_send_status_msg(int sock, int ret_code);
645 int consumer_send_status_channel(int sock,
646 struct lttng_consumer_channel *channel);
647 void notify_thread_del_channel(struct lttng_consumer_local_data *ctx,
648 uint64_t key);
649 void consumer_destroy_relayd(struct consumer_relayd_sock_pair *relayd);
650 unsigned long consumer_get_consumed_maxsize(unsigned long consumed_pos,
651 unsigned long produced_pos, uint64_t max_stream_size);
652 int consumer_add_data_stream(struct lttng_consumer_stream *stream);
653 void consumer_del_stream_for_data(struct lttng_consumer_stream *stream);
654 int consumer_add_metadata_stream(struct lttng_consumer_stream *stream);
655 void consumer_del_stream_for_metadata(struct lttng_consumer_stream *stream);
656 int consumer_create_index_file(struct lttng_consumer_stream *stream);
657
658 #endif /* LIB_CONSUMER_H */
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