License: common: error_query: fix typo in SPDX specifier
[lttng-tools.git] / src / common / consumer / consumer.hpp
1 /*
2 * Copyright (C) 2011 EfficiOS Inc.
3 * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * Copyright (C) 2012 David Goulet <dgoulet@efficios.com>
5 * Copyright (C) 2018 Jérémie Galarneau <jeremie.galarneau@efficios.com>
6 *
7 * SPDX-License-Identifier: GPL-2.0-only
8 *
9 */
10
11 #ifndef LIB_CONSUMER_H
12 #define LIB_CONSUMER_H
13
14 #include <common/buffer-view.hpp>
15 #include <common/credentials.hpp>
16 #include <common/dynamic-array.hpp>
17 #include <common/hashtable/hashtable.hpp>
18 #include <common/index/ctf-index.hpp>
19 #include <common/pipe.hpp>
20 #include <common/sessiond-comm/sessiond-comm.hpp>
21 #include <common/trace-chunk-registry.hpp>
22 #include <common/uuid.hpp>
23 #include <common/waiter.hpp>
24
25 #include <lttng/lttng.h>
26
27 #include <limits.h>
28 #include <poll.h>
29 #include <stdint.h>
30 #include <unistd.h>
31 #include <urcu/list.h>
32
33 struct lttng_consumer_local_data;
34
35 /* Commands for consumer */
36 enum lttng_consumer_command {
37 LTTNG_CONSUMER_ADD_CHANNEL,
38 LTTNG_CONSUMER_ADD_STREAM,
39 /* pause, delete, active depending on fd state */
40 LTTNG_CONSUMER_UPDATE_STREAM,
41 /* inform the consumer to quit when all fd has hang up */
42 LTTNG_CONSUMER_STOP, /* deprecated */
43 LTTNG_CONSUMER_ADD_RELAYD_SOCKET,
44 /* Inform the consumer to kill a specific relayd connection */
45 LTTNG_CONSUMER_DESTROY_RELAYD,
46 /* Return to the sessiond if there is data pending for a session */
47 LTTNG_CONSUMER_DATA_PENDING,
48 /* Consumer creates a channel and returns it to sessiond. */
49 LTTNG_CONSUMER_ASK_CHANNEL_CREATION,
50 LTTNG_CONSUMER_GET_CHANNEL,
51 LTTNG_CONSUMER_DESTROY_CHANNEL,
52 LTTNG_CONSUMER_PUSH_METADATA,
53 LTTNG_CONSUMER_CLOSE_METADATA,
54 LTTNG_CONSUMER_SETUP_METADATA,
55 LTTNG_CONSUMER_FLUSH_CHANNEL,
56 LTTNG_CONSUMER_SNAPSHOT_CHANNEL,
57 LTTNG_CONSUMER_SNAPSHOT_METADATA,
58 LTTNG_CONSUMER_STREAMS_SENT,
59 LTTNG_CONSUMER_DISCARDED_EVENTS,
60 LTTNG_CONSUMER_LOST_PACKETS,
61 LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL,
62 LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE,
63 LTTNG_CONSUMER_ROTATE_CHANNEL,
64 LTTNG_CONSUMER_INIT,
65 LTTNG_CONSUMER_CREATE_TRACE_CHUNK,
66 LTTNG_CONSUMER_CLOSE_TRACE_CHUNK,
67 LTTNG_CONSUMER_TRACE_CHUNK_EXISTS,
68 LTTNG_CONSUMER_CLEAR_CHANNEL,
69 LTTNG_CONSUMER_OPEN_CHANNEL_PACKETS,
70 };
71
72 enum lttng_consumer_type {
73 LTTNG_CONSUMER_UNKNOWN = 0,
74 LTTNG_CONSUMER_KERNEL,
75 LTTNG_CONSUMER64_UST,
76 LTTNG_CONSUMER32_UST,
77 };
78
79 enum consumer_endpoint_status {
80 CONSUMER_ENDPOINT_ACTIVE,
81 CONSUMER_ENDPOINT_INACTIVE,
82 };
83
84 enum consumer_channel_output {
85 CONSUMER_CHANNEL_MMAP = 0,
86 CONSUMER_CHANNEL_SPLICE = 1,
87 };
88
89 enum consumer_channel_type {
90 CONSUMER_CHANNEL_TYPE_METADATA = 0,
91 CONSUMER_CHANNEL_TYPE_DATA = 1,
92 };
93
94 enum sync_metadata_status {
95 SYNC_METADATA_STATUS_NEW_DATA,
96 SYNC_METADATA_STATUS_NO_DATA,
97 SYNC_METADATA_STATUS_ERROR,
98 };
99
100 extern struct lttng_consumer_global_data the_consumer_data;
101
102 struct stream_list {
103 struct cds_list_head head;
104 unsigned int count;
105 };
106
107 /* Stub. */
108 struct consumer_metadata_cache;
109
110 struct lttng_consumer_channel {
111 /* Is the channel published in the channel hash tables? */
112 bool is_published;
113 /*
114 * Was the channel deleted (logically) and waiting to be reclaimed?
115 * If this flag is set, no modification that is not cleaned-up by the
116 * RCU reclamation callback should be made
117 */
118 bool is_deleted;
119 /* HT node used for consumer_data.channel_ht */
120 struct lttng_ht_node_u64 node;
121 /* HT node used for consumer_data.channels_by_session_id_ht */
122 struct lttng_ht_node_u64 channels_by_session_id_ht_node;
123 /* Indexed key. Incremented value in the consumer. */
124 uint64_t key;
125 /* Number of streams referencing this channel */
126 int refcount;
127 /* Tracing session id on the session daemon side. */
128 uint64_t session_id;
129 /* Current trace chunk of the session in which this channel exists. */
130 struct lttng_trace_chunk *trace_chunk;
131 /*
132 * Session id when requesting metadata to the session daemon for
133 * a session with per-PID buffers.
134 */
135 uint64_t session_id_per_pid;
136 /*
137 * In the case of local streams, this field contains the channel's
138 * output path; a path relative to the session's output path.
139 * e.g. ust/uid/1000/64-bit
140 *
141 * In the case of remote streams, the contents of this field depends
142 * on the version of the relay daemon peer. For 2.11+ peers, the
143 * contents are the same as in the local case. However, for legacy
144 * peers, this contains a path of the form:
145 * /hostname/session_path/ust/uid/1000/64-bit
146 */
147 char pathname[PATH_MAX];
148 /* Channel name. */
149 char name[LTTNG_SYMBOL_NAME_LEN];
150 /* Relayd id of the channel. -1ULL if it does not apply. */
151 uint64_t relayd_id;
152 /*
153 * Number of streams NOT initialized yet. This is used in order to not
154 * delete this channel if streams are getting initialized.
155 */
156 unsigned int nb_init_stream_left;
157 /* Output type (mmap or splice). */
158 enum consumer_channel_output output;
159 /* Channel type for stream */
160 enum consumer_channel_type type;
161
162 /* For UST */
163 uid_t ust_app_uid; /* Application UID. */
164 struct lttng_ust_ctl_consumer_channel *uchan;
165 unsigned char uuid[LTTNG_UUID_STR_LEN];
166 /*
167 * Temporary stream list used to store the streams once created and waiting
168 * to be sent to the session daemon by receiving the
169 * LTTNG_CONSUMER_GET_CHANNEL.
170 */
171 struct stream_list streams;
172
173 /*
174 * Set if the channel is metadata. We keep a reference to the stream
175 * because we have to flush data once pushed by the session daemon. For a
176 * regular channel, this is always set to NULL.
177 */
178 struct lttng_consumer_stream *metadata_stream;
179
180 /* for UST */
181 int wait_fd;
182 /* Node within channel thread ht */
183 struct lttng_ht_node_u64 wait_fd_node;
184
185 /* Metadata cache is metadata channel */
186 struct consumer_metadata_cache *metadata_cache;
187
188 /*
189 * Wait queue awaiting updates to metadata stream's flushed position.
190 */
191 struct lttng_wait_queue metadata_pushed_wait_queue;
192
193 /* For UST metadata periodical flush */
194 int switch_timer_enabled;
195 timer_t switch_timer;
196 int switch_timer_error;
197
198 /* For the live mode */
199 int live_timer_enabled;
200 timer_t live_timer;
201 int live_timer_error;
202 /* Channel is part of a live session ? */
203 bool is_live;
204
205 /* For channel monitoring timer. */
206 int monitor_timer_enabled;
207 timer_t monitor_timer;
208
209 /* On-disk circular buffer */
210 uint64_t tracefile_size;
211 uint64_t tracefile_count;
212 /*
213 * Monitor or not the streams of this channel meaning this indicates if the
214 * streams should be sent to the data/metadata thread or added to the no
215 * monitor list of the channel.
216 */
217 unsigned int monitor;
218
219 /*
220 * Channel lock.
221 *
222 * This lock protects against concurrent update of channel.
223 *
224 * This is nested INSIDE the consumer data lock.
225 * This is nested OUTSIDE the channel timer lock.
226 * This is nested OUTSIDE the metadata cache lock.
227 * This is nested OUTSIDE stream lock.
228 * This is nested OUTSIDE consumer_relayd_sock_pair lock.
229 */
230 pthread_mutex_t lock;
231
232 /*
233 * Channel teardown lock.
234 *
235 * This lock protect against teardown of channel. It is _never_
236 * taken by the timer handler.
237 *
238 * This is nested INSIDE the consumer data lock.
239 * This is nested INSIDE the channel lock.
240 * This is nested OUTSIDE the metadata cache lock.
241 * This is nested OUTSIDE stream lock.
242 * This is nested OUTSIDE consumer_relayd_sock_pair lock.
243 */
244 pthread_mutex_t timer_lock;
245
246 /* Timer value in usec for live streaming. */
247 unsigned int live_timer_interval;
248
249 int *stream_fds;
250 int nr_stream_fds;
251 char root_shm_path[PATH_MAX];
252 char shm_path[PATH_MAX];
253 /* Only set for UST channels. */
254 LTTNG_OPTIONAL(struct lttng_credentials) buffer_credentials;
255 /* Total number of discarded events for that channel. */
256 uint64_t discarded_events;
257 /* Total number of missed packets due to overwriting (overwrite). */
258 uint64_t lost_packets;
259
260 bool streams_sent_to_relayd;
261 uint64_t last_consumed_size_sample_sent;
262 };
263
264 struct stream_subbuffer {
265 union {
266 /*
267 * CONSUMER_CHANNEL_SPLICE
268 * No ownership assumed.
269 */
270 int fd;
271 /* CONSUMER_CHANNEL_MMAP */
272 struct lttng_buffer_view buffer;
273 } buffer;
274 union {
275 /*
276 * Common members are fine to access through either
277 * union entries (as per C11, Common Initial Sequence).
278 */
279 struct {
280 unsigned long subbuf_size;
281 unsigned long padded_subbuf_size;
282 uint64_t version;
283 /*
284 * Left unset when unsupported.
285 *
286 * Indicates that this is the last sub-buffer of
287 * a series of sub-buffer that makes-up a coherent
288 * (parseable) unit of metadata.
289 */
290 LTTNG_OPTIONAL(bool) coherent;
291 } metadata;
292 struct {
293 unsigned long subbuf_size;
294 unsigned long padded_subbuf_size;
295 uint64_t packet_size;
296 uint64_t content_size;
297 uint64_t timestamp_begin;
298 uint64_t timestamp_end;
299 uint64_t events_discarded;
300 /* Left unset when unsupported. */
301 LTTNG_OPTIONAL(uint64_t) sequence_number;
302 uint64_t stream_id;
303 /* Left unset when unsupported. */
304 LTTNG_OPTIONAL(uint64_t) stream_instance_id;
305 } data;
306 } info;
307 };
308
309 enum get_next_subbuffer_status {
310 GET_NEXT_SUBBUFFER_STATUS_OK,
311 GET_NEXT_SUBBUFFER_STATUS_NO_DATA,
312 GET_NEXT_SUBBUFFER_STATUS_ERROR,
313 };
314
315 /*
316 * Perform any operation required to acknowledge
317 * the wake-up of a consumer stream (e.g. consume a byte on a wake-up pipe).
318 *
319 * Stream and channel locks are acquired during this call.
320 */
321 using on_wake_up_cb = int (*)(struct lttng_consumer_stream *);
322
323 /*
324 * Perform any operation required before a consumer stream is put
325 * to sleep before awaiting a data availability notification.
326 *
327 * Stream and channel locks are acquired during this call.
328 */
329 using on_sleep_cb = int (*)(struct lttng_consumer_stream *, struct lttng_consumer_local_data *);
330
331 /*
332 * Acquire the subbuffer at the current 'consumed' position.
333 *
334 * Stream and channel locks are acquired during this call.
335 */
336 using get_next_subbuffer_cb = enum get_next_subbuffer_status (*)(struct lttng_consumer_stream *,
337 struct stream_subbuffer *);
338
339 /*
340 * Populate the stream_subbuffer's info member. The info to populate
341 * depends on the type (metadata/data) of the stream.
342 *
343 * Stream and channel locks are acquired during this call.
344 */
345 using extract_subbuffer_info_cb = int (*)(struct lttng_consumer_stream *,
346 struct stream_subbuffer *);
347
348 /*
349 * Invoked after a subbuffer's info has been filled.
350 *
351 * Stream and channel locks are acquired during this call.
352 */
353 using pre_consume_subbuffer_cb = int (*)(struct lttng_consumer_stream *,
354 const struct stream_subbuffer *);
355
356 /*
357 * Consume subbuffer contents.
358 *
359 * Stream and channel locks are acquired during this call.
360 */
361 using consume_subbuffer_cb = ssize_t (*)(struct lttng_consumer_local_data *,
362 struct lttng_consumer_stream *,
363 const struct stream_subbuffer *);
364
365 /*
366 * Release the current subbuffer and advance the 'consumed' position by
367 * one subbuffer.
368 *
369 * Stream and channel locks are acquired during this call.
370 */
371 using put_next_subbuffer_cb = int (*)(struct lttng_consumer_stream *, struct stream_subbuffer *);
372
373 /*
374 * Invoked after consuming a subbuffer.
375 *
376 * Stream and channel locks are acquired during this call.
377 */
378 using post_consume_cb = int (*)(struct lttng_consumer_stream *,
379 const struct stream_subbuffer *,
380 struct lttng_consumer_local_data *);
381
382 /*
383 * Send a live beacon if no data is available.
384 *
385 * Stream and channel locks are acquired during this call.
386 */
387 using send_live_beacon_cb = int (*)(struct lttng_consumer_stream *);
388
389 /*
390 * Lock the stream and channel locks and any other stream-type specific
391 * lock that need to be acquired during the processing of an
392 * availability notification.
393 */
394 using lock_cb = void (*)(struct lttng_consumer_stream *);
395
396 /*
397 * Unlock the stream and channel locks and any other stream-type specific
398 * lock before sleeping until the next availability notification.
399 *
400 * Stream and channel locks are acquired during this call.
401 */
402 using unlock_cb = void (*)(struct lttng_consumer_stream *);
403
404 /*
405 * Assert that the stream and channel lock and any other stream type specific
406 * lock that need to be acquired during the processing of a read_subbuffer
407 * operation is acquired.
408 */
409 using assert_locked_cb = void (*)(struct lttng_consumer_stream *);
410
411 /*
412 * Invoked when a subbuffer's metadata version does not match the last
413 * known metadata version.
414 *
415 * Stream and channel locks are acquired during this call.
416 */
417 using reset_metadata_cb = void (*)(struct lttng_consumer_stream *);
418
419 /*
420 * Internal representation of the streams, sessiond_key is used to identify
421 * uniquely a stream.
422 */
423 struct lttng_consumer_stream {
424 /* HT node used by the data_ht and metadata_ht */
425 struct lttng_ht_node_u64 node;
426 /* stream indexed per channel key node */
427 struct lttng_ht_node_u64 node_channel_id;
428 /* HT node used in consumer_data.stream_list_ht */
429 struct lttng_ht_node_u64 node_session_id;
430 /*
431 * List used by channels to reference streams that are not yet globally
432 * visible.
433 */
434 struct cds_list_head send_node;
435 /* Pointer to associated channel. */
436 struct lttng_consumer_channel *chan;
437 /*
438 * Current trace chunk. Holds a reference to the trace chunk.
439 * `chunk` can be NULL when a stream is not associated to a chunk, e.g.
440 * when it was created in the context of a no-output session.
441 */
442 struct lttng_trace_chunk *trace_chunk;
443
444 /* Key by which the stream is indexed for 'node'. */
445 uint64_t key;
446 /*
447 * File descriptor of the data output file. This can be either a file or a
448 * socket fd for relayd streaming.
449 */
450 int out_fd; /* output file to write the data */
451 /* Write position in the output file descriptor */
452 off_t out_fd_offset;
453 /* Amount of bytes written to the output */
454 uint64_t output_written;
455 int shm_fd_is_copy;
456 /*
457 * When a stream's pipe is hung up, a final flush is performed (see hangup_flush_done). This
458 * indicates whether or not the data resulting from this flush is still to be consumed.
459 */
460 int has_data_left_to_be_read_before_teardown;
461 int hangup_flush_done;
462
463 /*
464 * Whether the stream is in a "complete" state (e.g. it does not have a
465 * partially written sub-buffer.
466 *
467 * Initialized to "false" on stream creation (first packet is empty).
468 *
469 * The various transitions of the quiescent state are:
470 * - On "start" tracing: set to false, since the stream is not
471 * "complete".
472 * - On "stop" tracing: if !quiescent -> flush FINAL (update
473 * timestamp_end), and set to true; the stream has entered a
474 * complete/quiescent state.
475 * - On "destroy" or stream/application hang-up: if !quiescent ->
476 * flush FINAL, and set to true.
477 *
478 * NOTE: Update and read are protected by the stream lock.
479 */
480 bool quiescent;
481
482 /*
483 * True if the sequence number is not available (lttng-modules < 2.8).
484 */
485 bool sequence_number_unavailable;
486
487 /*
488 * metadata_timer_lock protects flags waiting_on_metadata and
489 * missed_metadata_flush.
490 */
491 pthread_mutex_t metadata_timer_lock;
492 /*
493 * Flag set when awaiting metadata to be pushed. Used in the
494 * timer thread to skip waiting on the stream (and stream lock) to
495 * ensure we can proceed to flushing metadata in live mode.
496 */
497 bool waiting_on_metadata;
498 /* Raised when a timer misses a metadata flush. */
499 bool missed_metadata_flush;
500
501 enum lttng_event_output output;
502 /* Maximum subbuffer size (in bytes). */
503 unsigned long max_sb_size;
504
505 /*
506 * Still used by the kernel for MMAP output. For UST, the ustctl getter is
507 * used for the mmap base and offset.
508 */
509 void *mmap_base;
510 unsigned long mmap_len;
511
512 /* For UST */
513
514 int wait_fd;
515 /* Network sequence number. Indicating on which relayd socket it goes. */
516 uint64_t net_seq_idx;
517 /*
518 * Indicate if this stream was successfully sent to a relayd. This is set
519 * after the refcount of the relayd is incremented and is checked when the
520 * stream is closed before decrementing the refcount in order to avoid an
521 * unbalanced state.
522 */
523 unsigned int sent_to_relayd;
524
525 /* Identify if the stream is the metadata */
526 unsigned int metadata_flag;
527 /*
528 * Last known metadata version, reset the metadata file in case
529 * of change.
530 */
531 uint64_t metadata_version;
532 /* Used when the stream is set for network streaming */
533 uint64_t relayd_stream_id;
534 /*
535 * When sending a stream packet to a relayd, this number is used to track
536 * the packet sent by the consumer and seen by the relayd. When sending the
537 * data header to the relayd, this number is sent and if the transmission
538 * was successful, it is incremented.
539 *
540 * Even if the full data is not fully transmitted it won't matter since
541 * only two possible error can happen after that where either the relayd
542 * died or a read error is detected on the stream making this value useless
543 * after that.
544 *
545 * This value SHOULD be read/updated atomically or with the lock acquired.
546 */
547 uint64_t next_net_seq_num;
548 /*
549 * Lock to use the stream FDs since they are used between threads.
550 *
551 * This is nested INSIDE the consumer_data lock.
552 * This is nested INSIDE the channel lock.
553 * This is nested INSIDE the channel timer lock.
554 * This is nested OUTSIDE the metadata cache lock.
555 * This is nested OUTSIDE consumer_relayd_sock_pair lock.
556 */
557 pthread_mutex_t lock;
558 /* Tracing session id */
559 uint64_t session_id;
560 /*
561 * Indicates if the stream end point is still active or not (network
562 * streaming or local file system). The thread "owning" the stream is
563 * handling this status and can be notified of a state change through the
564 * consumer data appropriate pipe.
565 */
566 enum consumer_endpoint_status endpoint_status;
567 /* Stream name. Format is: <channel_name>_<cpu_number> */
568 char name[LTTNG_SYMBOL_NAME_LEN];
569 /* Internal state of libustctl. */
570 struct lttng_ust_ctl_consumer_stream *ustream;
571 /* On-disk circular buffer */
572 uint64_t tracefile_size_current;
573 uint64_t tracefile_count_current;
574 /*
575 * Monitor or not the streams of this channel meaning this indicates if the
576 * streams should be sent to the data/metadata thread or added to the no
577 * monitor list of the channel.
578 */
579 unsigned int monitor;
580 /*
581 * Indicate if the stream is globally visible meaning that it has been
582 * added to the multiple hash tables. If *not* set, NO lock should be
583 * acquired in the destroy path.
584 */
585 unsigned int globally_visible;
586 /*
587 * Pipe to wake up the metadata poll thread when the UST metadata
588 * cache is updated.
589 */
590 int ust_metadata_poll_pipe[2];
591 /*
592 * How much metadata was read from the metadata cache and sent
593 * to the channel.
594 */
595 uint64_t ust_metadata_pushed;
596 /*
597 * Copy of the last discarded event value to detect the overflow of
598 * the counter.
599 */
600 uint64_t last_discarded_events;
601 /* Copy of the sequence number of the last packet extracted. */
602 uint64_t last_sequence_number;
603 /*
604 * Index file object of the index file for this stream.
605 */
606 struct lttng_index_file *index_file;
607
608 /*
609 * Local pipe to extract data when using splice.
610 */
611 int splice_pipe[2];
612
613 /*
614 * Rendez-vous point between data and metadata stream in live mode.
615 */
616 pthread_cond_t metadata_rdv;
617 pthread_mutex_t metadata_rdv_lock;
618
619 /*
620 * rotate_position represents the packet sequence number of the last
621 * packet which belongs to the current trace chunk prior to the rotation.
622 * When that position is reached, this tracefile can be closed and a
623 * new one is created in channel_read_only_attributes.path.
624 */
625 uint64_t rotate_position;
626
627 /* Whether or not a packet was opened during the current trace chunk. */
628 bool opened_packet_in_current_trace_chunk;
629
630 /*
631 * Read-only copies of channel values. We cannot safely access the
632 * channel from a stream, so we need to have a local copy of these
633 * fields in the stream object. These fields should be removed from
634 * the stream objects when we introduce refcounting.
635 */
636 struct {
637 uint64_t tracefile_size;
638 } channel_read_only_attributes;
639
640 /*
641 * Flag to inform the data or metadata thread that a stream is
642 * ready to be rotated.
643 */
644 bool rotate_ready;
645
646 /* Indicate if the stream still has some data to be read. */
647 unsigned int has_data:1;
648 /*
649 * Inform the consumer or relay to reset the metadata
650 * file before writing in it (regeneration).
651 */
652 unsigned int reset_metadata_flag:1;
653 struct {
654 /*
655 * Invoked in the order of declaration.
656 * See callback type definitions.
657 */
658 lock_cb lock;
659 on_wake_up_cb on_wake_up;
660 get_next_subbuffer_cb get_next_subbuffer;
661 extract_subbuffer_info_cb extract_subbuffer_info;
662 pre_consume_subbuffer_cb pre_consume_subbuffer;
663 reset_metadata_cb reset_metadata;
664 consume_subbuffer_cb consume_subbuffer;
665 put_next_subbuffer_cb put_next_subbuffer;
666 struct lttng_dynamic_array post_consume_cbs;
667 send_live_beacon_cb send_live_beacon;
668 on_sleep_cb on_sleep;
669 unlock_cb unlock;
670 assert_locked_cb assert_locked;
671 } read_subbuffer_ops;
672 struct metadata_bucket *metadata_bucket;
673 };
674
675 /*
676 * Internal representation of a relayd socket pair.
677 */
678 struct consumer_relayd_sock_pair {
679 /* Network sequence number. */
680 uint64_t net_seq_idx;
681 /* Number of stream associated with this relayd */
682 int refcount;
683
684 /*
685 * This flag indicates whether or not we should destroy this object. The
686 * destruction should ONLY occurs when this flag is set and the refcount is
687 * set to zero.
688 */
689 unsigned int destroy_flag;
690
691 /*
692 * Mutex protecting the control socket to avoid out of order packets
693 * between threads sending data to the relayd. Since metadata data is sent
694 * over that socket, at least two sendmsg() are needed (header + data)
695 * creating a race for packets to overlap between threads using it.
696 *
697 * This is nested INSIDE the consumer_data lock.
698 * This is nested INSIDE the stream lock.
699 */
700 pthread_mutex_t ctrl_sock_mutex;
701
702 /* Control socket. Command and metadata are passed over it */
703 struct lttcomm_relayd_sock control_sock;
704
705 /*
706 * We don't need a mutex at this point since we only splice or write single
707 * large chunk of data with a header appended at the begining. Moreover,
708 * this socket is for now only used in a single thread.
709 */
710 struct lttcomm_relayd_sock data_sock;
711 struct lttng_ht_node_u64 node;
712
713 /* Session id on both sides for the sockets. */
714 uint64_t relayd_session_id;
715 uint64_t sessiond_session_id;
716 struct lttng_consumer_local_data *ctx;
717 };
718
719 /*
720 * UST consumer local data to the program. One or more instance per
721 * process.
722 */
723 struct lttng_consumer_local_data {
724 /*
725 * Function to call when data is available on a buffer.
726 * Returns the number of bytes read, or negative error value.
727 */
728 ssize_t (*on_buffer_ready)(struct lttng_consumer_stream *stream,
729 struct lttng_consumer_local_data *ctx,
730 bool locked_by_caller);
731 /*
732 * function to call when we receive a new channel, it receives a
733 * newly allocated channel, depending on the return code of this
734 * function, the new channel will be handled by the application
735 * or the library.
736 *
737 * Returns:
738 * > 0 (success, FD is kept by application)
739 * == 0 (success, FD is left to library)
740 * < 0 (error)
741 */
742 int (*on_recv_channel)(struct lttng_consumer_channel *channel);
743 /*
744 * function to call when we receive a new stream, it receives a
745 * newly allocated stream, depending on the return code of this
746 * function, the new stream will be handled by the application
747 * or the library.
748 *
749 * Returns:
750 * > 0 (success, FD is kept by application)
751 * == 0 (success, FD is left to library)
752 * < 0 (error)
753 */
754 int (*on_recv_stream)(struct lttng_consumer_stream *stream);
755 /*
756 * function to call when a stream is getting updated by the session
757 * daemon, this function receives the sessiond key and the new
758 * state, depending on the return code of this function the
759 * update of state for the stream is handled by the application
760 * or the library.
761 *
762 * Returns:
763 * > 0 (success, FD is kept by application)
764 * == 0 (success, FD is left to library)
765 * < 0 (error)
766 */
767 int (*on_update_stream)(uint64_t sessiond_key, uint32_t state);
768 enum lttng_consumer_type type;
769 /* socket to communicate errors with sessiond */
770 int consumer_error_socket;
771 /* socket to ask metadata to sessiond. */
772 int consumer_metadata_socket;
773 /*
774 * Protect consumer_metadata_socket.
775 *
776 * This is nested OUTSIDE the metadata cache lock.
777 */
778 pthread_mutex_t metadata_socket_lock;
779 /* socket to exchange commands with sessiond */
780 char *consumer_command_sock_path;
781 /* communication with splice */
782 int consumer_channel_pipe[2];
783 /* Data stream poll thread pipe. To transfer data stream to the thread */
784 struct lttng_pipe *consumer_data_pipe;
785
786 /*
787 * Data thread use that pipe to catch wakeup from read subbuffer that
788 * detects that there is still data to be read for the stream encountered.
789 * Before doing so, the stream is flagged to indicate that there is still
790 * data to be read.
791 *
792 * Both pipes (read/write) are owned and used inside the data thread.
793 */
794 struct lttng_pipe *consumer_wakeup_pipe;
795 /* Indicate if the wakeup thread has been notified. */
796 unsigned int has_wakeup:1;
797
798 /* to let the signal handler wake up the fd receiver thread */
799 int consumer_should_quit[2];
800 /* Metadata poll thread pipe. Transfer metadata stream to it */
801 struct lttng_pipe *consumer_metadata_pipe;
802 /*
803 * Pipe used by the channel monitoring timers to provide state samples
804 * to the session daemon (write-only).
805 */
806 int channel_monitor_pipe;
807 LTTNG_OPTIONAL(lttng_uuid) sessiond_uuid;
808 };
809
810 /*
811 * Library-level data. One instance per process.
812 */
813 struct lttng_consumer_global_data {
814 /*
815 * At this time, this lock is used to ensure coherence between the count
816 * and number of element in the hash table. It's also a protection for
817 * concurrent read/write between threads.
818 *
819 * This is nested OUTSIDE the stream lock.
820 * This is nested OUTSIDE the consumer_relayd_sock_pair lock.
821 */
822 pthread_mutex_t lock{};
823
824 /*
825 * Number of streams in the data stream hash table declared outside.
826 * Protected by consumer_data.lock.
827 */
828 int stream_count = 0;
829
830 /* Channel hash table protected by consumer_data.lock. */
831 struct lttng_ht *channel_ht = nullptr;
832 /* Channel hash table indexed by session id. */
833 struct lttng_ht *channels_by_session_id_ht = nullptr;
834 /*
835 * Flag specifying if the local array of FDs needs update in the
836 * poll function. Protected by consumer_data.lock.
837 */
838 unsigned int need_update = 1;
839 enum lttng_consumer_type type = LTTNG_CONSUMER_UNKNOWN;
840
841 /*
842 * Relayd socket(s) hashtable indexed by network sequence number. Each
843 * stream has an index which associate the right relayd socket to use.
844 */
845 struct lttng_ht *relayd_ht = nullptr;
846
847 /*
848 * This hash table contains all streams (metadata and data) indexed by
849 * session id. In other words, the ht is indexed by session id and each
850 * bucket contains the list of associated streams.
851 *
852 * This HT uses the "node_session_id" of the consumer stream.
853 */
854 struct lttng_ht *stream_list_ht = nullptr;
855
856 /*
857 * This HT uses the "node_channel_id" of the consumer stream.
858 */
859 struct lttng_ht *stream_per_chan_id_ht = nullptr;
860
861 /*
862 * Trace chunk registry indexed by (session_id, chunk_id).
863 */
864 struct lttng_trace_chunk_registry *chunk_registry = nullptr;
865 };
866
867 /*
868 * Set to nonzero when the consumer is exiting. Updated by signal
869 * handler and thread exit, read by threads.
870 */
871 extern int consumer_quit;
872
873 /*
874 * Set to nonzero when the consumer is exiting. Updated by signal
875 * handler and thread exit, read by threads.
876 */
877 extern int consumer_quit;
878
879 /*
880 * Flag used to temporarily pause data consumption from testpoints.
881 *
882 * This variable is dlsym-ed from a test, so needs to be exported.
883 */
884 LTTNG_EXPORT extern int data_consumption_paused;
885
886 /* Return a human-readable consumer type string that is suitable for logging. */
887 static inline const char *lttng_consumer_type_str(enum lttng_consumer_type type)
888 {
889 switch (type) {
890 case LTTNG_CONSUMER_UNKNOWN:
891 return "unknown";
892 case LTTNG_CONSUMER_KERNEL:
893 return "kernel";
894 case LTTNG_CONSUMER32_UST:
895 return "32-bit user space";
896 case LTTNG_CONSUMER64_UST:
897 return "64-bit user space";
898 default:
899 abort();
900 }
901 }
902
903 /*
904 * Init consumer data structures.
905 */
906 int lttng_consumer_init();
907
908 /*
909 * Set the error socket for communication with a session daemon.
910 */
911 void lttng_consumer_set_error_sock(struct lttng_consumer_local_data *ctx, int sock);
912
913 /*
914 * Set the command socket path for communication with a session daemon.
915 */
916 void lttng_consumer_set_command_sock_path(struct lttng_consumer_local_data *ctx, char *sock);
917
918 /*
919 * Send return code to session daemon.
920 *
921 * Returns the return code of sendmsg : the number of bytes transmitted or -1
922 * on error.
923 */
924 int lttng_consumer_send_error(struct lttng_consumer_local_data *ctx, int cmd);
925
926 /*
927 * Called from signal handler to ensure a clean exit.
928 */
929 void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx);
930
931 /*
932 * Cleanup the daemon's socket on exit.
933 */
934 void lttng_consumer_cleanup();
935
936 /*
937 * Poll on the should_quit pipe and the command socket return -1 on error and
938 * should exit, 0 if data is available on the command socket
939 */
940 int lttng_consumer_poll_socket(struct pollfd *kconsumer_sockpoll);
941
942 /*
943 * Copy the fields from the channel that need to be accessed (read-only)
944 * directly from the stream.
945 */
946 void consumer_stream_update_channel_attributes(struct lttng_consumer_stream *stream,
947 struct lttng_consumer_channel *channel);
948
949 struct lttng_consumer_stream *consumer_allocate_stream(struct lttng_consumer_channel *channel,
950 uint64_t channel_key,
951 uint64_t stream_key,
952 const char *channel_name,
953 uint64_t relayd_id,
954 uint64_t session_id,
955 struct lttng_trace_chunk *trace_chunk,
956 int cpu,
957 int *alloc_ret,
958 enum consumer_channel_type type,
959 unsigned int monitor);
960 struct lttng_consumer_channel *consumer_allocate_channel(uint64_t key,
961 uint64_t session_id,
962 const uint64_t *chunk_id,
963 const char *pathname,
964 const char *name,
965 uint64_t relayd_id,
966 enum lttng_event_output output,
967 uint64_t tracefile_size,
968 uint64_t tracefile_count,
969 uint64_t session_id_per_pid,
970 unsigned int monitor,
971 unsigned int live_timer_interval,
972 bool is_in_live_session,
973 const char *root_shm_path,
974 const char *shm_path);
975 void consumer_del_stream(struct lttng_consumer_stream *stream, struct lttng_ht *ht);
976 void consumer_del_metadata_stream(struct lttng_consumer_stream *stream, struct lttng_ht *ht);
977 int consumer_add_channel(struct lttng_consumer_channel *channel,
978 struct lttng_consumer_local_data *ctx);
979 void consumer_del_channel(struct lttng_consumer_channel *channel);
980
981 /* lttng-relayd consumer command */
982 struct consumer_relayd_sock_pair *consumer_find_relayd(uint64_t key);
983 int consumer_send_relayd_stream(struct lttng_consumer_stream *stream, char *path);
984 int consumer_send_relayd_streams_sent(uint64_t net_seq_idx);
985 void close_relayd_stream(struct lttng_consumer_stream *stream);
986 struct lttng_consumer_channel *consumer_find_channel(uint64_t key);
987 int consumer_handle_stream_before_relayd(struct lttng_consumer_stream *stream, size_t data_size);
988 void consumer_steal_stream_key(int key, struct lttng_ht *ht);
989
990 struct lttng_consumer_local_data *
991 lttng_consumer_create(enum lttng_consumer_type type,
992 ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream,
993 struct lttng_consumer_local_data *ctx,
994 bool locked_by_caller),
995 int (*recv_channel)(struct lttng_consumer_channel *channel),
996 int (*recv_stream)(struct lttng_consumer_stream *stream),
997 int (*update_stream)(uint64_t sessiond_key, uint32_t state));
998 void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx);
999 ssize_t lttng_consumer_on_read_subbuffer_mmap(struct lttng_consumer_stream *stream,
1000 const struct lttng_buffer_view *buffer,
1001 unsigned long padding);
1002 ssize_t lttng_consumer_on_read_subbuffer_splice(struct lttng_consumer_local_data *ctx,
1003 struct lttng_consumer_stream *stream,
1004 unsigned long len,
1005 unsigned long padding);
1006 int lttng_consumer_sample_snapshot_positions(struct lttng_consumer_stream *stream);
1007 int lttng_consumer_take_snapshot(struct lttng_consumer_stream *stream);
1008 int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream *stream, unsigned long *pos);
1009 int lttng_consumer_get_consumed_snapshot(struct lttng_consumer_stream *stream, unsigned long *pos);
1010 int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream);
1011 int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream);
1012 void *consumer_thread_metadata_poll(void *data);
1013 void *consumer_thread_data_poll(void *data);
1014 void *consumer_thread_sessiond_poll(void *data);
1015 void *consumer_thread_channel_poll(void *data);
1016 int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx,
1017 int sock,
1018 struct pollfd *consumer_sockpoll);
1019
1020 ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream,
1021 struct lttng_consumer_local_data *ctx,
1022 bool locked_by_caller);
1023 int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream);
1024 void consumer_add_relayd_socket(uint64_t net_seq_idx,
1025 int sock_type,
1026 struct lttng_consumer_local_data *ctx,
1027 int sock,
1028 struct pollfd *consumer_sockpoll,
1029 uint64_t sessiond_id,
1030 uint64_t relayd_session_id,
1031 uint32_t relayd_version_major,
1032 uint32_t relayd_version_minor,
1033 enum lttcomm_sock_proto relayd_socket_protocol);
1034 void consumer_flag_relayd_for_destroy(struct consumer_relayd_sock_pair *relayd);
1035 int consumer_data_pending(uint64_t id);
1036 int consumer_send_status_msg(int sock, int ret_code);
1037 int consumer_send_status_channel(int sock, struct lttng_consumer_channel *channel);
1038 void notify_thread_del_channel(struct lttng_consumer_local_data *ctx, uint64_t key);
1039 void consumer_destroy_relayd(struct consumer_relayd_sock_pair *relayd);
1040 unsigned long consumer_get_consume_start_pos(unsigned long consumed_pos,
1041 unsigned long produced_pos,
1042 uint64_t nb_packets_per_stream,
1043 uint64_t max_sb_size);
1044 void consumer_add_data_stream(struct lttng_consumer_stream *stream);
1045 void consumer_del_stream_for_data(struct lttng_consumer_stream *stream);
1046 void consumer_add_metadata_stream(struct lttng_consumer_stream *stream);
1047 void consumer_del_stream_for_metadata(struct lttng_consumer_stream *stream);
1048 int consumer_create_index_file(struct lttng_consumer_stream *stream);
1049 int lttng_consumer_rotate_channel(struct lttng_consumer_channel *channel,
1050 uint64_t key,
1051 uint64_t relayd_id);
1052 int lttng_consumer_stream_is_rotate_ready(struct lttng_consumer_stream *stream);
1053 int lttng_consumer_rotate_stream(struct lttng_consumer_stream *stream);
1054 int lttng_consumer_rotate_ready_streams(struct lttng_consumer_channel *channel, uint64_t key);
1055 void lttng_consumer_reset_stream_rotate_state(struct lttng_consumer_stream *stream);
1056 enum lttcomm_return_code
1057 lttng_consumer_create_trace_chunk(const uint64_t *relayd_id,
1058 uint64_t session_id,
1059 uint64_t chunk_id,
1060 time_t chunk_creation_timestamp,
1061 const char *chunk_override_name,
1062 const struct lttng_credentials *credentials,
1063 struct lttng_directory_handle *chunk_directory_handle);
1064 enum lttcomm_return_code
1065 lttng_consumer_close_trace_chunk(const uint64_t *relayd_id,
1066 uint64_t session_id,
1067 uint64_t chunk_id,
1068 time_t chunk_close_timestamp,
1069 const enum lttng_trace_chunk_command_type *close_command,
1070 char *path);
1071 enum lttcomm_return_code lttng_consumer_trace_chunk_exists(const uint64_t *relayd_id,
1072 uint64_t session_id,
1073 uint64_t chunk_id);
1074 void lttng_consumer_cleanup_relayd(struct consumer_relayd_sock_pair *relayd);
1075 enum lttcomm_return_code lttng_consumer_init_command(struct lttng_consumer_local_data *ctx,
1076 const lttng_uuid& sessiond_uuid);
1077 int lttng_consumer_clear_channel(struct lttng_consumer_channel *channel);
1078 enum lttcomm_return_code
1079 lttng_consumer_open_channel_packets(struct lttng_consumer_channel *channel);
1080 int consumer_metadata_wakeup_pipe(const struct lttng_consumer_channel *channel);
1081 void lttng_consumer_sigbus_handle(void *addr);
1082 void sample_and_send_channel_buffer_stats(struct lttng_consumer_channel *channel);
1083
1084 #endif /* LIB_CONSUMER_H */
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