db5cbf6a01004710de022fae90bffff8e31bb53e
[lttng-tools.git] / src / common / consumer / 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 LTTNG_CONSUMER_DISCARDED_EVENTS,
62 LTTNG_CONSUMER_LOST_PACKETS,
63 LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL,
64 };
65
66 /* State of each fd in consumer */
67 enum lttng_consumer_stream_state {
68 LTTNG_CONSUMER_ACTIVE_STREAM,
69 LTTNG_CONSUMER_PAUSE_STREAM,
70 LTTNG_CONSUMER_DELETE_STREAM,
71 };
72
73 enum lttng_consumer_type {
74 LTTNG_CONSUMER_UNKNOWN = 0,
75 LTTNG_CONSUMER_KERNEL,
76 LTTNG_CONSUMER64_UST,
77 LTTNG_CONSUMER32_UST,
78 };
79
80 enum consumer_endpoint_status {
81 CONSUMER_ENDPOINT_ACTIVE,
82 CONSUMER_ENDPOINT_INACTIVE,
83 };
84
85 enum consumer_channel_output {
86 CONSUMER_CHANNEL_MMAP = 0,
87 CONSUMER_CHANNEL_SPLICE = 1,
88 };
89
90 enum consumer_channel_type {
91 CONSUMER_CHANNEL_TYPE_METADATA = 0,
92 CONSUMER_CHANNEL_TYPE_DATA = 1,
93 };
94
95 extern struct lttng_consumer_global_data consumer_data;
96
97 struct stream_list {
98 struct cds_list_head head;
99 unsigned int count;
100 };
101
102 /* Stub. */
103 struct consumer_metadata_cache;
104
105 struct lttng_consumer_channel {
106 /* HT node used for consumer_data.channel_ht */
107 struct lttng_ht_node_u64 node;
108 /* Indexed key. Incremented value in the consumer. */
109 uint64_t key;
110 /* Number of streams referencing this channel */
111 int refcount;
112 /* Tracing session id on the session daemon side. */
113 uint64_t session_id;
114 /*
115 * Session id when requesting metadata to the session daemon for
116 * a session with per-PID buffers.
117 */
118 uint64_t session_id_per_pid;
119 /* Channel trace file path name. */
120 char pathname[PATH_MAX];
121 /* Channel name. */
122 char name[LTTNG_SYMBOL_NAME_LEN];
123 /* UID and GID of the session owning this channel. */
124 uid_t uid;
125 gid_t gid;
126 /* Relayd id of the channel. -1ULL if it does not apply. */
127 uint64_t relayd_id;
128 /*
129 * Number of streams NOT initialized yet. This is used in order to not
130 * delete this channel if streams are getting initialized.
131 */
132 unsigned int nb_init_stream_left;
133 /* Output type (mmap or splice). */
134 enum consumer_channel_output output;
135 /* Channel type for stream */
136 enum consumer_channel_type type;
137
138 /* For UST */
139 uid_t ust_app_uid; /* Application UID. */
140 struct ustctl_consumer_channel *uchan;
141 unsigned char uuid[UUID_STR_LEN];
142 /*
143 * Temporary stream list used to store the streams once created and waiting
144 * to be sent to the session daemon by receiving the
145 * LTTNG_CONSUMER_GET_CHANNEL.
146 */
147 struct stream_list streams;
148
149 /*
150 * Set if the channel is metadata. We keep a reference to the stream
151 * because we have to flush data once pushed by the session daemon. For a
152 * regular channel, this is always set to NULL.
153 */
154 struct lttng_consumer_stream *metadata_stream;
155
156 /* for UST */
157 int wait_fd;
158 /* Node within channel thread ht */
159 struct lttng_ht_node_u64 wait_fd_node;
160
161 /* Metadata cache is metadata channel */
162 struct consumer_metadata_cache *metadata_cache;
163 /* For UST metadata periodical flush */
164 int switch_timer_enabled;
165 timer_t switch_timer;
166 int switch_timer_error;
167
168 /* For the live mode */
169 int live_timer_enabled;
170 timer_t live_timer;
171 int live_timer_error;
172
173 /* On-disk circular buffer */
174 uint64_t tracefile_size;
175 uint64_t tracefile_count;
176 /*
177 * Monitor or not the streams of this channel meaning this indicates if the
178 * streams should be sent to the data/metadata thread or added to the no
179 * monitor list of the channel.
180 */
181 unsigned int monitor;
182
183 /*
184 * Channel lock.
185 *
186 * This lock protects against concurrent update of channel.
187 *
188 * This is nested INSIDE the consumer data lock.
189 * This is nested OUTSIDE the channel timer lock.
190 * This is nested OUTSIDE the metadata cache lock.
191 * This is nested OUTSIDE stream lock.
192 * This is nested OUTSIDE consumer_relayd_sock_pair lock.
193 */
194 pthread_mutex_t lock;
195
196 /*
197 * Channel teardown lock.
198 *
199 * This lock protect against teardown of channel. It is _never_
200 * taken by the timer handler.
201 *
202 * This is nested INSIDE the consumer data lock.
203 * This is nested INSIDE the channel lock.
204 * This is nested OUTSIDE the metadata cache lock.
205 * This is nested OUTSIDE stream lock.
206 * This is nested OUTSIDE consumer_relayd_sock_pair lock.
207 */
208 pthread_mutex_t timer_lock;
209
210 /* Timer value in usec for live streaming. */
211 unsigned int live_timer_interval;
212
213 int *stream_fds;
214 int nr_stream_fds;
215 char root_shm_path[PATH_MAX];
216 char shm_path[PATH_MAX];
217 /* Total number of discarded events for that channel. */
218 uint64_t discarded_events;
219 /* Total number of missed packets due to overwriting (overwrite). */
220 uint64_t lost_packets;
221 };
222
223 /*
224 * Internal representation of the streams, sessiond_key is used to identify
225 * uniquely a stream.
226 */
227 struct lttng_consumer_stream {
228 /* HT node used by the data_ht and metadata_ht */
229 struct lttng_ht_node_u64 node;
230 /* stream indexed per channel key node */
231 struct lttng_ht_node_u64 node_channel_id;
232 /* HT node used in consumer_data.stream_list_ht */
233 struct lttng_ht_node_u64 node_session_id;
234 /* Pointer to associated channel. */
235 struct lttng_consumer_channel *chan;
236
237 /* Key by which the stream is indexed for 'node'. */
238 uint64_t key;
239 /*
240 * File descriptor of the data output file. This can be either a file or a
241 * socket fd for relayd streaming.
242 */
243 int out_fd; /* output file to write the data */
244 /* Write position in the output file descriptor */
245 off_t out_fd_offset;
246 /* Amount of bytes written to the output */
247 uint64_t output_written;
248 enum lttng_consumer_stream_state state;
249 int shm_fd_is_copy;
250 int data_read;
251 int hangup_flush_done;
252
253 /*
254 * Whether the stream is in a "complete" state (e.g. it does not have a
255 * partially written sub-buffer.
256 *
257 * Initialized to "false" on stream creation (first packet is empty).
258 *
259 * The various transitions of the quiescent state are:
260 * - On "start" tracing: set to false, since the stream is not
261 * "complete".
262 * - On "stop" tracing: if !quiescent -> flush FINAL (update
263 * timestamp_end), and set to true; the stream has entered a
264 * complete/quiescent state.
265 * - On "destroy" or stream/application hang-up: if !quiescent ->
266 * flush FINAL, and set to true.
267 *
268 * NOTE: Update and read are protected by the stream lock.
269 */
270 bool quiescent;
271
272 /*
273 * metadata_timer_lock protects flags waiting_on_metadata and
274 * missed_metadata_flush.
275 */
276 pthread_mutex_t metadata_timer_lock;
277 /*
278 * Flag set when awaiting metadata to be pushed. Used in the
279 * timer thread to skip waiting on the stream (and stream lock) to
280 * ensure we can proceed to flushing metadata in live mode.
281 */
282 bool waiting_on_metadata;
283 /* Raised when a timer misses a metadata flush. */
284 bool missed_metadata_flush;
285
286 enum lttng_event_output output;
287 /* Maximum subbuffer size. */
288 unsigned long max_sb_size;
289
290 /*
291 * Still used by the kernel for MMAP output. For UST, the ustctl getter is
292 * used for the mmap base and offset.
293 */
294 void *mmap_base;
295 unsigned long mmap_len;
296
297 /* For UST */
298
299 int wait_fd;
300 /* UID/GID of the user owning the session to which stream belongs */
301 uid_t uid;
302 gid_t gid;
303 /* Network sequence number. Indicating on which relayd socket it goes. */
304 uint64_t net_seq_idx;
305 /*
306 * Indicate if this stream was successfully sent to a relayd. This is set
307 * after the refcount of the relayd is incremented and is checked when the
308 * stream is closed before decrementing the refcount in order to avoid an
309 * unbalanced state.
310 */
311 unsigned int sent_to_relayd;
312
313 /* Identify if the stream is the metadata */
314 unsigned int metadata_flag;
315 /*
316 * Last known metadata version, reset the metadata file in case
317 * of change.
318 */
319 uint64_t metadata_version;
320 /* Used when the stream is set for network streaming */
321 uint64_t relayd_stream_id;
322 /*
323 * When sending a stream packet to a relayd, this number is used to track
324 * the packet sent by the consumer and seen by the relayd. When sending the
325 * data header to the relayd, this number is sent and if the transmission
326 * was successful, it is incremented.
327 *
328 * Even if the full data is not fully transmitted it won't matter since
329 * only two possible error can happen after that where either the relayd
330 * died or a read error is detected on the stream making this value useless
331 * after that.
332 *
333 * This value SHOULD be read/updated atomically or with the lock acquired.
334 */
335 uint64_t next_net_seq_num;
336 /*
337 * Lock to use the stream FDs since they are used between threads.
338 *
339 * This is nested INSIDE the consumer_data lock.
340 * This is nested INSIDE the metadata cache lock.
341 * This is nested INSIDE the channel lock.
342 * This is nested INSIDE the channel timer lock.
343 * This is nested OUTSIDE consumer_relayd_sock_pair lock.
344 */
345 pthread_mutex_t lock;
346 /* Tracing session id */
347 uint64_t session_id;
348 /*
349 * Indicates if the stream end point is still active or not (network
350 * streaming or local file system). The thread "owning" the stream is
351 * handling this status and can be notified of a state change through the
352 * consumer data appropriate pipe.
353 */
354 enum consumer_endpoint_status endpoint_status;
355 /* Stream name. Format is: <channel_name>_<cpu_number> */
356 char name[LTTNG_SYMBOL_NAME_LEN];
357 /* Internal state of libustctl. */
358 struct ustctl_consumer_stream *ustream;
359 struct cds_list_head send_node;
360 /* On-disk circular buffer */
361 uint64_t tracefile_size_current;
362 uint64_t tracefile_count_current;
363 /*
364 * Monitor or not the streams of this channel meaning this indicates if the
365 * streams should be sent to the data/metadata thread or added to the no
366 * monitor list of the channel.
367 */
368 unsigned int monitor;
369 /*
370 * Indicate if the stream is globally visible meaning that it has been
371 * added to the multiple hash tables. If *not* set, NO lock should be
372 * acquired in the destroy path.
373 */
374 unsigned int globally_visible;
375 /*
376 * Pipe to wake up the metadata poll thread when the UST metadata
377 * cache is updated.
378 */
379 int ust_metadata_poll_pipe[2];
380 /*
381 * How much metadata was read from the metadata cache and sent
382 * to the channel.
383 */
384 uint64_t ust_metadata_pushed;
385 /*
386 * Copy of the last discarded event value to detect the overflow of
387 * the counter.
388 */
389 uint64_t last_discarded_events;
390 /* Copy of the sequence number of the last packet extracted. */
391 uint64_t last_sequence_number;
392 /*
393 * FD of the index file for this stream.
394 */
395 int index_fd;
396
397 /*
398 * Local pipe to extract data when using splice.
399 */
400 int splice_pipe[2];
401
402 /*
403 * Rendez-vous point between data and metadata stream in live mode.
404 */
405 pthread_cond_t metadata_rdv;
406 pthread_mutex_t metadata_rdv_lock;
407
408 /* Indicate if the stream still has some data to be read. */
409 unsigned int has_data:1;
410 /*
411 * Inform the consumer or relay to reset the metadata
412 * file before writing in it (regeneration).
413 */
414 unsigned int reset_metadata_flag:1;
415 };
416
417 /*
418 * Internal representation of a relayd socket pair.
419 */
420 struct consumer_relayd_sock_pair {
421 /* Network sequence number. */
422 uint64_t net_seq_idx;
423 /* Number of stream associated with this relayd */
424 unsigned int refcount;
425
426 /*
427 * This flag indicates whether or not we should destroy this object. The
428 * destruction should ONLY occurs when this flag is set and the refcount is
429 * set to zero.
430 */
431 unsigned int destroy_flag;
432
433 /*
434 * Mutex protecting the control socket to avoid out of order packets
435 * between threads sending data to the relayd. Since metadata data is sent
436 * over that socket, at least two sendmsg() are needed (header + data)
437 * creating a race for packets to overlap between threads using it.
438 *
439 * This is nested INSIDE the consumer_data lock.
440 * This is nested INSIDE the stream lock.
441 */
442 pthread_mutex_t ctrl_sock_mutex;
443
444 /* Control socket. Command and metadata are passed over it */
445 struct lttcomm_relayd_sock control_sock;
446
447 /*
448 * We don't need a mutex at this point since we only splice or write single
449 * large chunk of data with a header appended at the begining. Moreover,
450 * this socket is for now only used in a single thread.
451 */
452 struct lttcomm_relayd_sock data_sock;
453 struct lttng_ht_node_u64 node;
454
455 /* Session id on both sides for the sockets. */
456 uint64_t relayd_session_id;
457 uint64_t sessiond_session_id;
458 };
459
460 /*
461 * UST consumer local data to the program. One or more instance per
462 * process.
463 */
464 struct lttng_consumer_local_data {
465 /*
466 * Function to call when data is available on a buffer.
467 * Returns the number of bytes read, or negative error value.
468 */
469 ssize_t (*on_buffer_ready)(struct lttng_consumer_stream *stream,
470 struct lttng_consumer_local_data *ctx);
471 /*
472 * function to call when we receive a new channel, it receives a
473 * newly allocated channel, depending on the return code of this
474 * function, the new channel will be handled by the application
475 * or the library.
476 *
477 * Returns:
478 * > 0 (success, FD is kept by application)
479 * == 0 (success, FD is left to library)
480 * < 0 (error)
481 */
482 int (*on_recv_channel)(struct lttng_consumer_channel *channel);
483 /*
484 * function to call when we receive a new stream, it receives a
485 * newly allocated stream, depending on the return code of this
486 * function, the new stream will be handled by the application
487 * or the library.
488 *
489 * Returns:
490 * > 0 (success, FD is kept by application)
491 * == 0 (success, FD is left to library)
492 * < 0 (error)
493 */
494 int (*on_recv_stream)(struct lttng_consumer_stream *stream);
495 /*
496 * function to call when a stream is getting updated by the session
497 * daemon, this function receives the sessiond key and the new
498 * state, depending on the return code of this function the
499 * update of state for the stream is handled by the application
500 * or the library.
501 *
502 * Returns:
503 * > 0 (success, FD is kept by application)
504 * == 0 (success, FD is left to library)
505 * < 0 (error)
506 */
507 int (*on_update_stream)(uint64_t sessiond_key, uint32_t state);
508 enum lttng_consumer_type type;
509 /* socket to communicate errors with sessiond */
510 int consumer_error_socket;
511 /* socket to ask metadata to sessiond. */
512 int consumer_metadata_socket;
513 /*
514 * Protect consumer_metadata_socket.
515 *
516 * This is nested OUTSIDE the metadata cache lock.
517 */
518 pthread_mutex_t metadata_socket_lock;
519 /* socket to exchange commands with sessiond */
520 char *consumer_command_sock_path;
521 /* communication with splice */
522 int consumer_channel_pipe[2];
523 /* Data stream poll thread pipe. To transfer data stream to the thread */
524 struct lttng_pipe *consumer_data_pipe;
525
526 /*
527 * Data thread use that pipe to catch wakeup from read subbuffer that
528 * detects that there is still data to be read for the stream encountered.
529 * Before doing so, the stream is flagged to indicate that there is still
530 * data to be read.
531 *
532 * Both pipes (read/write) are owned and used inside the data thread.
533 */
534 struct lttng_pipe *consumer_wakeup_pipe;
535 /* Indicate if the wakeup thread has been notified. */
536 unsigned int has_wakeup:1;
537
538 /* to let the signal handler wake up the fd receiver thread */
539 int consumer_should_quit[2];
540 /* Metadata poll thread pipe. Transfer metadata stream to it */
541 struct lttng_pipe *consumer_metadata_pipe;
542 };
543
544 /*
545 * Library-level data. One instance per process.
546 */
547 struct lttng_consumer_global_data {
548 /*
549 * At this time, this lock is used to ensure coherence between the count
550 * and number of element in the hash table. It's also a protection for
551 * concurrent read/write between threads.
552 *
553 * This is nested OUTSIDE the stream lock.
554 * This is nested OUTSIDE the consumer_relayd_sock_pair lock.
555 */
556 pthread_mutex_t lock;
557
558 /*
559 * Number of streams in the data stream hash table declared outside.
560 * Protected by consumer_data.lock.
561 */
562 int stream_count;
563
564 /* Channel hash table protected by consumer_data.lock. */
565 struct lttng_ht *channel_ht;
566 /*
567 * Flag specifying if the local array of FDs needs update in the
568 * poll function. Protected by consumer_data.lock.
569 */
570 unsigned int need_update;
571 enum lttng_consumer_type type;
572
573 /*
574 * Relayd socket(s) hashtable indexed by network sequence number. Each
575 * stream has an index which associate the right relayd socket to use.
576 */
577 struct lttng_ht *relayd_ht;
578
579 /*
580 * This hash table contains all streams (metadata and data) indexed by
581 * session id. In other words, the ht is indexed by session id and each
582 * bucket contains the list of associated streams.
583 *
584 * This HT uses the "node_session_id" of the consumer stream.
585 */
586 struct lttng_ht *stream_list_ht;
587
588 /*
589 * This HT uses the "node_channel_id" of the consumer stream.
590 */
591 struct lttng_ht *stream_per_chan_id_ht;
592 };
593
594 /*
595 * Init consumer data structures.
596 */
597 int lttng_consumer_init(void);
598
599 /*
600 * Set the error socket for communication with a session daemon.
601 */
602 void lttng_consumer_set_error_sock(struct lttng_consumer_local_data *ctx,
603 int sock);
604
605 /*
606 * Set the command socket path for communication with a session daemon.
607 */
608 void lttng_consumer_set_command_sock_path(
609 struct lttng_consumer_local_data *ctx, char *sock);
610
611 /*
612 * Send return code to session daemon.
613 *
614 * Returns the return code of sendmsg : the number of bytes transmitted or -1
615 * on error.
616 */
617 int lttng_consumer_send_error(struct lttng_consumer_local_data *ctx, int cmd);
618
619 /*
620 * Called from signal handler to ensure a clean exit.
621 */
622 void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx);
623
624 /*
625 * Cleanup the daemon's socket on exit.
626 */
627 void lttng_consumer_cleanup(void);
628
629 /*
630 * Flush pending writes to trace output disk file.
631 */
632 void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream,
633 off_t orig_offset);
634
635 /*
636 * Poll on the should_quit pipe and the command socket return -1 on error and
637 * should exit, 0 if data is available on the command socket
638 */
639 int lttng_consumer_poll_socket(struct pollfd *kconsumer_sockpoll);
640
641 struct lttng_consumer_stream *consumer_allocate_stream(uint64_t channel_key,
642 uint64_t stream_key,
643 enum lttng_consumer_stream_state state,
644 const char *channel_name,
645 uid_t uid,
646 gid_t gid,
647 uint64_t relayd_id,
648 uint64_t session_id,
649 int cpu,
650 int *alloc_ret,
651 enum consumer_channel_type type,
652 unsigned int monitor);
653 struct lttng_consumer_channel *consumer_allocate_channel(uint64_t key,
654 uint64_t session_id,
655 const char *pathname,
656 const char *name,
657 uid_t uid,
658 gid_t gid,
659 uint64_t relayd_id,
660 enum lttng_event_output output,
661 uint64_t tracefile_size,
662 uint64_t tracefile_count,
663 uint64_t session_id_per_pid,
664 unsigned int monitor,
665 unsigned int live_timer_interval,
666 const char *root_shm_path,
667 const char *shm_path);
668 void consumer_del_stream(struct lttng_consumer_stream *stream,
669 struct lttng_ht *ht);
670 void consumer_del_metadata_stream(struct lttng_consumer_stream *stream,
671 struct lttng_ht *ht);
672 int consumer_add_channel(struct lttng_consumer_channel *channel,
673 struct lttng_consumer_local_data *ctx);
674 void consumer_del_channel(struct lttng_consumer_channel *channel);
675
676 /* lttng-relayd consumer command */
677 struct consumer_relayd_sock_pair *consumer_find_relayd(uint64_t key);
678 int consumer_send_relayd_stream(struct lttng_consumer_stream *stream, char *path);
679 int consumer_send_relayd_streams_sent(uint64_t net_seq_idx);
680 void close_relayd_stream(struct lttng_consumer_stream *stream);
681 struct lttng_consumer_channel *consumer_find_channel(uint64_t key);
682 int consumer_handle_stream_before_relayd(struct lttng_consumer_stream *stream,
683 size_t data_size);
684 void consumer_steal_stream_key(int key, struct lttng_ht *ht);
685
686 struct lttng_consumer_local_data *lttng_consumer_create(
687 enum lttng_consumer_type type,
688 ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream,
689 struct lttng_consumer_local_data *ctx),
690 int (*recv_channel)(struct lttng_consumer_channel *channel),
691 int (*recv_stream)(struct lttng_consumer_stream *stream),
692 int (*update_stream)(uint64_t sessiond_key, uint32_t state));
693 void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx);
694 ssize_t lttng_consumer_on_read_subbuffer_mmap(
695 struct lttng_consumer_local_data *ctx,
696 struct lttng_consumer_stream *stream, unsigned long len,
697 unsigned long padding,
698 struct ctf_packet_index *index);
699 ssize_t lttng_consumer_on_read_subbuffer_splice(
700 struct lttng_consumer_local_data *ctx,
701 struct lttng_consumer_stream *stream, unsigned long len,
702 unsigned long padding,
703 struct ctf_packet_index *index);
704 int lttng_consumer_take_snapshot(struct lttng_consumer_stream *stream);
705 int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream *stream,
706 unsigned long *pos);
707 int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream);
708 int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream);
709 void *consumer_thread_metadata_poll(void *data);
710 void *consumer_thread_data_poll(void *data);
711 void *consumer_thread_sessiond_poll(void *data);
712 void *consumer_thread_channel_poll(void *data);
713 int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx,
714 int sock, struct pollfd *consumer_sockpoll);
715
716 ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream,
717 struct lttng_consumer_local_data *ctx);
718 int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream);
719 int consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type,
720 struct lttng_consumer_local_data *ctx, int sock,
721 struct pollfd *consumer_sockpoll, struct lttcomm_relayd_sock *relayd_sock,
722 uint64_t sessiond_id, uint64_t relayd_session_id);
723 void consumer_flag_relayd_for_destroy(
724 struct consumer_relayd_sock_pair *relayd);
725 int consumer_data_pending(uint64_t id);
726 int consumer_send_status_msg(int sock, int ret_code);
727 int consumer_send_status_channel(int sock,
728 struct lttng_consumer_channel *channel);
729 void notify_thread_del_channel(struct lttng_consumer_local_data *ctx,
730 uint64_t key);
731 void consumer_destroy_relayd(struct consumer_relayd_sock_pair *relayd);
732 unsigned long consumer_get_consume_start_pos(unsigned long consumed_pos,
733 unsigned long produced_pos, uint64_t nb_packets_per_stream,
734 uint64_t max_sb_size);
735 int consumer_add_data_stream(struct lttng_consumer_stream *stream);
736 void consumer_del_stream_for_data(struct lttng_consumer_stream *stream);
737 int consumer_add_metadata_stream(struct lttng_consumer_stream *stream);
738 void consumer_del_stream_for_metadata(struct lttng_consumer_stream *stream);
739 int consumer_create_index_file(struct lttng_consumer_stream *stream);
740
741 #endif /* LIB_CONSUMER_H */
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