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>
7 * SPDX-License-Identifier: GPL-2.0-only
11 #ifndef LIB_CONSUMER_H
12 #define LIB_CONSUMER_H
17 #include <urcu/list.h>
19 #include <lttng/lttng.h>
21 #include <common/hashtable/hashtable.h>
22 #include <common/compat/fcntl.h>
23 #include <common/uuid.h>
24 #include <common/sessiond-comm/sessiond-comm.h>
25 #include <common/pipe.h>
26 #include <common/index/ctf-index.h>
27 #include <common/trace-chunk-registry.h>
28 #include <common/credentials.h>
29 #include <common/buffer-view.h>
31 struct lttng_consumer_local_data
;
33 /* Commands for consumer */
34 enum lttng_consumer_command
{
35 LTTNG_CONSUMER_ADD_CHANNEL
,
36 LTTNG_CONSUMER_ADD_STREAM
,
37 /* pause, delete, active depending on fd state */
38 LTTNG_CONSUMER_UPDATE_STREAM
,
39 /* inform the consumer to quit when all fd has hang up */
40 LTTNG_CONSUMER_STOP
, /* deprecated */
41 LTTNG_CONSUMER_ADD_RELAYD_SOCKET
,
42 /* Inform the consumer to kill a specific relayd connection */
43 LTTNG_CONSUMER_DESTROY_RELAYD
,
44 /* Return to the sessiond if there is data pending for a session */
45 LTTNG_CONSUMER_DATA_PENDING
,
46 /* Consumer creates a channel and returns it to sessiond. */
47 LTTNG_CONSUMER_ASK_CHANNEL_CREATION
,
48 LTTNG_CONSUMER_GET_CHANNEL
,
49 LTTNG_CONSUMER_DESTROY_CHANNEL
,
50 LTTNG_CONSUMER_PUSH_METADATA
,
51 LTTNG_CONSUMER_CLOSE_METADATA
,
52 LTTNG_CONSUMER_SETUP_METADATA
,
53 LTTNG_CONSUMER_FLUSH_CHANNEL
,
54 LTTNG_CONSUMER_SNAPSHOT_CHANNEL
,
55 LTTNG_CONSUMER_SNAPSHOT_METADATA
,
56 LTTNG_CONSUMER_STREAMS_SENT
,
57 LTTNG_CONSUMER_DISCARDED_EVENTS
,
58 LTTNG_CONSUMER_LOST_PACKETS
,
59 LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL
,
60 LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE
,
61 LTTNG_CONSUMER_ROTATE_CHANNEL
,
63 LTTNG_CONSUMER_CREATE_TRACE_CHUNK
,
64 LTTNG_CONSUMER_CLOSE_TRACE_CHUNK
,
65 LTTNG_CONSUMER_TRACE_CHUNK_EXISTS
,
66 LTTNG_CONSUMER_CLEAR_CHANNEL
,
67 LTTNG_CONSUMER_OPEN_CHANNEL_PACKETS
,
70 enum lttng_consumer_type
{
71 LTTNG_CONSUMER_UNKNOWN
= 0,
72 LTTNG_CONSUMER_KERNEL
,
77 enum consumer_endpoint_status
{
78 CONSUMER_ENDPOINT_ACTIVE
,
79 CONSUMER_ENDPOINT_INACTIVE
,
82 enum consumer_channel_output
{
83 CONSUMER_CHANNEL_MMAP
= 0,
84 CONSUMER_CHANNEL_SPLICE
= 1,
87 enum consumer_channel_type
{
88 CONSUMER_CHANNEL_TYPE_METADATA
= 0,
89 CONSUMER_CHANNEL_TYPE_DATA
= 1,
92 enum sync_metadata_status
{
93 SYNC_METADATA_STATUS_NEW_DATA
,
94 SYNC_METADATA_STATUS_NO_DATA
,
95 SYNC_METADATA_STATUS_ERROR
,
98 extern struct lttng_consumer_global_data consumer_data
;
101 struct cds_list_head head
;
106 struct consumer_metadata_cache
;
108 struct lttng_consumer_channel
{
109 /* Is the channel published in the channel hash tables? */
112 * Was the channel deleted (logically) and waiting to be reclaimed?
113 * If this flag is set, no modification that is not cleaned-up by the
114 * RCU reclamation callback should be made
117 /* HT node used for consumer_data.channel_ht */
118 struct lttng_ht_node_u64 node
;
119 /* HT node used for consumer_data.channels_by_session_id_ht */
120 struct lttng_ht_node_u64 channels_by_session_id_ht_node
;
121 /* Indexed key. Incremented value in the consumer. */
123 /* Number of streams referencing this channel */
125 /* Tracing session id on the session daemon side. */
127 /* Current trace chunk of the session in which this channel exists. */
128 struct lttng_trace_chunk
*trace_chunk
;
130 * Session id when requesting metadata to the session daemon for
131 * a session with per-PID buffers.
133 uint64_t session_id_per_pid
;
135 * In the case of local streams, this field contains the channel's
136 * output path; a path relative to the session's output path.
137 * e.g. ust/uid/1000/64-bit
139 * In the case of remote streams, the contents of this field depends
140 * on the version of the relay daemon peer. For 2.11+ peers, the
141 * contents are the same as in the local case. However, for legacy
142 * peers, this contains a path of the form:
143 * /hostname/session_path/ust/uid/1000/64-bit
145 char pathname
[PATH_MAX
];
147 char name
[LTTNG_SYMBOL_NAME_LEN
];
148 /* Relayd id of the channel. -1ULL if it does not apply. */
151 * Number of streams NOT initialized yet. This is used in order to not
152 * delete this channel if streams are getting initialized.
154 unsigned int nb_init_stream_left
;
155 /* Output type (mmap or splice). */
156 enum consumer_channel_output output
;
157 /* Channel type for stream */
158 enum consumer_channel_type type
;
161 uid_t ust_app_uid
; /* Application UID. */
162 struct ustctl_consumer_channel
*uchan
;
163 unsigned char uuid
[LTTNG_UUID_STR_LEN
];
165 * Temporary stream list used to store the streams once created and waiting
166 * to be sent to the session daemon by receiving the
167 * LTTNG_CONSUMER_GET_CHANNEL.
169 struct stream_list streams
;
172 * Set if the channel is metadata. We keep a reference to the stream
173 * because we have to flush data once pushed by the session daemon. For a
174 * regular channel, this is always set to NULL.
176 struct lttng_consumer_stream
*metadata_stream
;
180 /* Node within channel thread ht */
181 struct lttng_ht_node_u64 wait_fd_node
;
183 /* Metadata cache is metadata channel */
184 struct consumer_metadata_cache
*metadata_cache
;
186 /* For UST metadata periodical flush */
187 int switch_timer_enabled
;
188 timer_t switch_timer
;
189 int switch_timer_error
;
191 /* For the live mode */
192 int live_timer_enabled
;
194 int live_timer_error
;
195 /* Channel is part of a live session ? */
198 /* For channel monitoring timer. */
199 int monitor_timer_enabled
;
200 timer_t monitor_timer
;
202 /* On-disk circular buffer */
203 uint64_t tracefile_size
;
204 uint64_t tracefile_count
;
206 * Monitor or not the streams of this channel meaning this indicates if the
207 * streams should be sent to the data/metadata thread or added to the no
208 * monitor list of the channel.
210 unsigned int monitor
;
215 * This lock protects against concurrent update of channel.
217 * This is nested INSIDE the consumer data lock.
218 * This is nested OUTSIDE the channel timer lock.
219 * This is nested OUTSIDE the metadata cache lock.
220 * This is nested OUTSIDE stream lock.
221 * This is nested OUTSIDE consumer_relayd_sock_pair lock.
223 pthread_mutex_t lock
;
226 * Channel teardown lock.
228 * This lock protect against teardown of channel. It is _never_
229 * taken by the timer handler.
231 * This is nested INSIDE the consumer data lock.
232 * This is nested INSIDE the channel lock.
233 * This is nested OUTSIDE the metadata cache lock.
234 * This is nested OUTSIDE stream lock.
235 * This is nested OUTSIDE consumer_relayd_sock_pair lock.
237 pthread_mutex_t timer_lock
;
239 /* Timer value in usec for live streaming. */
240 unsigned int live_timer_interval
;
244 char root_shm_path
[PATH_MAX
];
245 char shm_path
[PATH_MAX
];
246 /* Only set for UST channels. */
247 LTTNG_OPTIONAL(struct lttng_credentials
) buffer_credentials
;
248 /* Total number of discarded events for that channel. */
249 uint64_t discarded_events
;
250 /* Total number of missed packets due to overwriting (overwrite). */
251 uint64_t lost_packets
;
253 bool streams_sent_to_relayd
;
256 struct stream_subbuffer
{
259 * CONSUMER_CHANNEL_SPLICE
260 * No ownership assumed.
263 /* CONSUMER_CHANNEL_MMAP */
264 struct lttng_buffer_view buffer
;
268 * Common members are fine to access through either
269 * union entries (as per C11, Common Initial Sequence).
272 unsigned long subbuf_size
;
273 unsigned long padded_subbuf_size
;
276 * Left unset when unsupported.
278 * Indicates that this is the last sub-buffer of
279 * a series of sub-buffer that makes-up a coherent
280 * (parseable) unit of metadata.
282 LTTNG_OPTIONAL(bool) coherent
;
285 unsigned long subbuf_size
;
286 unsigned long padded_subbuf_size
;
287 uint64_t packet_size
;
288 uint64_t content_size
;
289 uint64_t timestamp_begin
;
290 uint64_t timestamp_end
;
291 uint64_t events_discarded
;
292 /* Left unset when unsupported. */
293 LTTNG_OPTIONAL(uint64_t) sequence_number
;
295 /* Left unset when unsupported. */
296 LTTNG_OPTIONAL(uint64_t) stream_instance_id
;
302 * Perform any operation required to acknowledge
303 * the wake-up of a consumer stream (e.g. consume a byte on a wake-up pipe).
305 * Stream and channel locks are acquired during this call.
307 typedef int (*on_wake_up_cb
)(struct lttng_consumer_stream
*);
310 * Perform any operation required before a consumer stream is put
311 * to sleep before awaiting a data availability notification.
313 * Stream and channel locks are acquired during this call.
315 typedef int (*on_sleep_cb
)(struct lttng_consumer_stream
*,
316 struct lttng_consumer_local_data
*);
319 * Acquire the subbuffer at the current 'consumed' position.
321 * Stream and channel locks are acquired during this call.
323 typedef int (*get_next_subbuffer_cb
)(struct lttng_consumer_stream
*,
324 struct stream_subbuffer
*);
327 * Populate the stream_subbuffer's info member. The info to populate
328 * depends on the type (metadata/data) of the stream.
330 * Stream and channel locks are acquired during this call.
332 typedef int (*extract_subbuffer_info_cb
)(
333 struct lttng_consumer_stream
*, struct stream_subbuffer
*);
336 * Invoked after a subbuffer's info has been filled.
338 * Stream and channel locks are acquired during this call.
340 typedef int (*pre_consume_subbuffer_cb
)(struct lttng_consumer_stream
*,
341 const struct stream_subbuffer
*);
344 * Consume subbuffer contents.
346 * Stream and channel locks are acquired during this call.
348 typedef ssize_t (*consume_subbuffer_cb
)(struct lttng_consumer_local_data
*,
349 struct lttng_consumer_stream
*,
350 const struct stream_subbuffer
*);
353 * Release the current subbuffer and advance the 'consumed' position by
356 * Stream and channel locks are acquired during this call.
358 typedef int (*put_next_subbuffer_cb
)(struct lttng_consumer_stream
*,
359 struct stream_subbuffer
*);
362 * Invoked after consuming a subbuffer.
364 * Stream and channel locks are acquired during this call.
366 typedef int (*post_consume_cb
)(struct lttng_consumer_stream
*,
367 const struct stream_subbuffer
*,
368 struct lttng_consumer_local_data
*);
371 * Send a live beacon if no data is available.
373 * Stream and channel locks are acquired during this call.
375 typedef int (*send_live_beacon_cb
)(struct lttng_consumer_stream
*);
378 * Lock the stream and channel locks and any other stream-type specific
379 * lock that need to be acquired during the processing of an
380 * availability notification.
382 typedef void (*lock_cb
)(struct lttng_consumer_stream
*);
385 * Unlock the stream and channel locks and any other stream-type specific
386 * lock before sleeping until the next availability notification.
388 * Stream and channel locks are acquired during this call.
390 typedef void (*unlock_cb
)(struct lttng_consumer_stream
*);
393 * Assert that the stream and channel lock and any other stream type specific
394 * lock that need to be acquired during the processing of a read_subbuffer
395 * operation is acquired.
397 typedef void (*assert_locked_cb
)(struct lttng_consumer_stream
*);
400 * Invoked when a subbuffer's metadata version does not match the last
401 * known metadata version.
403 * Stream and channel locks are acquired during this call.
405 typedef void (*reset_metadata_cb
)(struct lttng_consumer_stream
*);
408 * Internal representation of the streams, sessiond_key is used to identify
411 struct lttng_consumer_stream
{
412 /* HT node used by the data_ht and metadata_ht */
413 struct lttng_ht_node_u64 node
;
414 /* stream indexed per channel key node */
415 struct lttng_ht_node_u64 node_channel_id
;
416 /* HT node used in consumer_data.stream_list_ht */
417 struct lttng_ht_node_u64 node_session_id
;
418 /* Pointer to associated channel. */
419 struct lttng_consumer_channel
*chan
;
421 * Current trace chunk. Holds a reference to the trace chunk.
422 * `chunk` can be NULL when a stream is not associated to a chunk, e.g.
423 * when it was created in the context of a no-output session.
425 struct lttng_trace_chunk
*trace_chunk
;
427 /* Key by which the stream is indexed for 'node'. */
430 * File descriptor of the data output file. This can be either a file or a
431 * socket fd for relayd streaming.
433 int out_fd
; /* output file to write the data */
434 /* Write position in the output file descriptor */
436 /* Amount of bytes written to the output */
437 uint64_t output_written
;
440 int hangup_flush_done
;
443 * Whether the stream is in a "complete" state (e.g. it does not have a
444 * partially written sub-buffer.
446 * Initialized to "false" on stream creation (first packet is empty).
448 * The various transitions of the quiescent state are:
449 * - On "start" tracing: set to false, since the stream is not
451 * - On "stop" tracing: if !quiescent -> flush FINAL (update
452 * timestamp_end), and set to true; the stream has entered a
453 * complete/quiescent state.
454 * - On "destroy" or stream/application hang-up: if !quiescent ->
455 * flush FINAL, and set to true.
457 * NOTE: Update and read are protected by the stream lock.
462 * True if the sequence number is not available (lttng-modules < 2.8).
464 bool sequence_number_unavailable
;
467 * metadata_timer_lock protects flags waiting_on_metadata and
468 * missed_metadata_flush.
470 pthread_mutex_t metadata_timer_lock
;
472 * Flag set when awaiting metadata to be pushed. Used in the
473 * timer thread to skip waiting on the stream (and stream lock) to
474 * ensure we can proceed to flushing metadata in live mode.
476 bool waiting_on_metadata
;
477 /* Raised when a timer misses a metadata flush. */
478 bool missed_metadata_flush
;
480 enum lttng_event_output output
;
481 /* Maximum subbuffer size (in bytes). */
482 unsigned long max_sb_size
;
485 * Still used by the kernel for MMAP output. For UST, the ustctl getter is
486 * used for the mmap base and offset.
489 unsigned long mmap_len
;
494 /* Network sequence number. Indicating on which relayd socket it goes. */
495 uint64_t net_seq_idx
;
497 * Indicate if this stream was successfully sent to a relayd. This is set
498 * after the refcount of the relayd is incremented and is checked when the
499 * stream is closed before decrementing the refcount in order to avoid an
502 unsigned int sent_to_relayd
;
504 /* Identify if the stream is the metadata */
505 unsigned int metadata_flag
;
507 * Last known metadata version, reset the metadata file in case
510 uint64_t metadata_version
;
511 /* Used when the stream is set for network streaming */
512 uint64_t relayd_stream_id
;
514 * When sending a stream packet to a relayd, this number is used to track
515 * the packet sent by the consumer and seen by the relayd. When sending the
516 * data header to the relayd, this number is sent and if the transmission
517 * was successful, it is incremented.
519 * Even if the full data is not fully transmitted it won't matter since
520 * only two possible error can happen after that where either the relayd
521 * died or a read error is detected on the stream making this value useless
524 * This value SHOULD be read/updated atomically or with the lock acquired.
526 uint64_t next_net_seq_num
;
528 * Lock to use the stream FDs since they are used between threads.
530 * This is nested INSIDE the consumer_data lock.
531 * This is nested INSIDE the channel lock.
532 * This is nested INSIDE the channel timer lock.
533 * This is nested OUTSIDE the metadata cache lock.
534 * This is nested OUTSIDE consumer_relayd_sock_pair lock.
536 pthread_mutex_t lock
;
537 /* Tracing session id */
540 * Indicates if the stream end point is still active or not (network
541 * streaming or local file system). The thread "owning" the stream is
542 * handling this status and can be notified of a state change through the
543 * consumer data appropriate pipe.
545 enum consumer_endpoint_status endpoint_status
;
546 /* Stream name. Format is: <channel_name>_<cpu_number> */
547 char name
[LTTNG_SYMBOL_NAME_LEN
];
548 /* Internal state of libustctl. */
549 struct ustctl_consumer_stream
*ustream
;
550 struct cds_list_head send_node
;
551 /* On-disk circular buffer */
552 uint64_t tracefile_size_current
;
553 uint64_t tracefile_count_current
;
555 * Monitor or not the streams of this channel meaning this indicates if the
556 * streams should be sent to the data/metadata thread or added to the no
557 * monitor list of the channel.
559 unsigned int monitor
;
561 * Indicate if the stream is globally visible meaning that it has been
562 * added to the multiple hash tables. If *not* set, NO lock should be
563 * acquired in the destroy path.
565 unsigned int globally_visible
;
567 * Pipe to wake up the metadata poll thread when the UST metadata
570 int ust_metadata_poll_pipe
[2];
572 * How much metadata was read from the metadata cache and sent
575 uint64_t ust_metadata_pushed
;
577 * Copy of the last discarded event value to detect the overflow of
580 uint64_t last_discarded_events
;
581 /* Copy of the sequence number of the last packet extracted. */
582 uint64_t last_sequence_number
;
584 * Index file object of the index file for this stream.
586 struct lttng_index_file
*index_file
;
589 * Local pipe to extract data when using splice.
594 * Rendez-vous point between data and metadata stream in live mode.
596 pthread_cond_t metadata_rdv
;
597 pthread_mutex_t metadata_rdv_lock
;
600 * rotate_position represents the packet sequence number of the last
601 * packet which belongs to the current trace chunk prior to the rotation.
602 * When that position is reached, this tracefile can be closed and a
603 * new one is created in channel_read_only_attributes.path.
605 uint64_t rotate_position
;
607 /* Whether or not a packet was opened during the current trace chunk. */
608 bool opened_packet_in_current_trace_chunk
;
611 * Read-only copies of channel values. We cannot safely access the
612 * channel from a stream, so we need to have a local copy of these
613 * fields in the stream object. These fields should be removed from
614 * the stream objects when we introduce refcounting.
617 uint64_t tracefile_size
;
618 } channel_read_only_attributes
;
621 * Flag to inform the data or metadata thread that a stream is
622 * ready to be rotated.
626 /* Indicate if the stream still has some data to be read. */
627 unsigned int has_data
:1;
629 * Inform the consumer or relay to reset the metadata
630 * file before writing in it (regeneration).
632 unsigned int reset_metadata_flag
:1;
635 * Invoked in the order of declaration.
636 * See callback type definitions.
639 on_wake_up_cb on_wake_up
;
640 get_next_subbuffer_cb get_next_subbuffer
;
641 extract_subbuffer_info_cb extract_subbuffer_info
;
642 pre_consume_subbuffer_cb pre_consume_subbuffer
;
643 reset_metadata_cb reset_metadata
;
644 consume_subbuffer_cb consume_subbuffer
;
645 put_next_subbuffer_cb put_next_subbuffer
;
646 post_consume_cb post_consume
;
647 send_live_beacon_cb send_live_beacon
;
648 on_sleep_cb on_sleep
;
650 assert_locked_cb assert_locked
;
651 } read_subbuffer_ops
;
652 struct metadata_bucket
*metadata_bucket
;
656 * Internal representation of a relayd socket pair.
658 struct consumer_relayd_sock_pair
{
659 /* Network sequence number. */
660 uint64_t net_seq_idx
;
661 /* Number of stream associated with this relayd */
665 * This flag indicates whether or not we should destroy this object. The
666 * destruction should ONLY occurs when this flag is set and the refcount is
669 unsigned int destroy_flag
;
672 * Mutex protecting the control socket to avoid out of order packets
673 * between threads sending data to the relayd. Since metadata data is sent
674 * over that socket, at least two sendmsg() are needed (header + data)
675 * creating a race for packets to overlap between threads using it.
677 * This is nested INSIDE the consumer_data lock.
678 * This is nested INSIDE the stream lock.
680 pthread_mutex_t ctrl_sock_mutex
;
682 /* Control socket. Command and metadata are passed over it */
683 struct lttcomm_relayd_sock control_sock
;
686 * We don't need a mutex at this point since we only splice or write single
687 * large chunk of data with a header appended at the begining. Moreover,
688 * this socket is for now only used in a single thread.
690 struct lttcomm_relayd_sock data_sock
;
691 struct lttng_ht_node_u64 node
;
693 /* Session id on both sides for the sockets. */
694 uint64_t relayd_session_id
;
695 uint64_t sessiond_session_id
;
696 struct lttng_consumer_local_data
*ctx
;
700 * UST consumer local data to the program. One or more instance per
703 struct lttng_consumer_local_data
{
705 * Function to call when data is available on a buffer.
706 * Returns the number of bytes read, or negative error value.
708 ssize_t (*on_buffer_ready
)(struct lttng_consumer_stream
*stream
,
709 struct lttng_consumer_local_data
*ctx
,
710 bool locked_by_caller
);
712 * function to call when we receive a new channel, it receives a
713 * newly allocated channel, depending on the return code of this
714 * function, the new channel will be handled by the application
718 * > 0 (success, FD is kept by application)
719 * == 0 (success, FD is left to library)
722 int (*on_recv_channel
)(struct lttng_consumer_channel
*channel
);
724 * function to call when we receive a new stream, it receives a
725 * newly allocated stream, depending on the return code of this
726 * function, the new stream will be handled by the application
730 * > 0 (success, FD is kept by application)
731 * == 0 (success, FD is left to library)
734 int (*on_recv_stream
)(struct lttng_consumer_stream
*stream
);
736 * function to call when a stream is getting updated by the session
737 * daemon, this function receives the sessiond key and the new
738 * state, depending on the return code of this function the
739 * update of state for the stream is handled by the application
743 * > 0 (success, FD is kept by application)
744 * == 0 (success, FD is left to library)
747 int (*on_update_stream
)(uint64_t sessiond_key
, uint32_t state
);
748 enum lttng_consumer_type type
;
749 /* socket to communicate errors with sessiond */
750 int consumer_error_socket
;
751 /* socket to ask metadata to sessiond. */
752 int consumer_metadata_socket
;
754 * Protect consumer_metadata_socket.
756 * This is nested OUTSIDE the metadata cache lock.
758 pthread_mutex_t metadata_socket_lock
;
759 /* socket to exchange commands with sessiond */
760 char *consumer_command_sock_path
;
761 /* communication with splice */
762 int consumer_channel_pipe
[2];
763 /* Data stream poll thread pipe. To transfer data stream to the thread */
764 struct lttng_pipe
*consumer_data_pipe
;
767 * Data thread use that pipe to catch wakeup from read subbuffer that
768 * detects that there is still data to be read for the stream encountered.
769 * Before doing so, the stream is flagged to indicate that there is still
772 * Both pipes (read/write) are owned and used inside the data thread.
774 struct lttng_pipe
*consumer_wakeup_pipe
;
775 /* Indicate if the wakeup thread has been notified. */
776 unsigned int has_wakeup
:1;
778 /* to let the signal handler wake up the fd receiver thread */
779 int consumer_should_quit
[2];
780 /* Metadata poll thread pipe. Transfer metadata stream to it */
781 struct lttng_pipe
*consumer_metadata_pipe
;
783 * Pipe used by the channel monitoring timers to provide state samples
784 * to the session daemon (write-only).
786 int channel_monitor_pipe
;
787 LTTNG_OPTIONAL(lttng_uuid
) sessiond_uuid
;
791 * Library-level data. One instance per process.
793 struct lttng_consumer_global_data
{
795 * At this time, this lock is used to ensure coherence between the count
796 * and number of element in the hash table. It's also a protection for
797 * concurrent read/write between threads.
799 * This is nested OUTSIDE the stream lock.
800 * This is nested OUTSIDE the consumer_relayd_sock_pair lock.
802 pthread_mutex_t lock
;
805 * Number of streams in the data stream hash table declared outside.
806 * Protected by consumer_data.lock.
810 /* Channel hash table protected by consumer_data.lock. */
811 struct lttng_ht
*channel_ht
;
812 /* Channel hash table indexed by session id. */
813 struct lttng_ht
*channels_by_session_id_ht
;
815 * Flag specifying if the local array of FDs needs update in the
816 * poll function. Protected by consumer_data.lock.
818 unsigned int need_update
;
819 enum lttng_consumer_type type
;
822 * Relayd socket(s) hashtable indexed by network sequence number. Each
823 * stream has an index which associate the right relayd socket to use.
825 struct lttng_ht
*relayd_ht
;
828 * This hash table contains all streams (metadata and data) indexed by
829 * session id. In other words, the ht is indexed by session id and each
830 * bucket contains the list of associated streams.
832 * This HT uses the "node_session_id" of the consumer stream.
834 struct lttng_ht
*stream_list_ht
;
837 * This HT uses the "node_channel_id" of the consumer stream.
839 struct lttng_ht
*stream_per_chan_id_ht
;
842 * Trace chunk registry indexed by (session_id, chunk_id).
844 struct lttng_trace_chunk_registry
*chunk_registry
;
848 * Set to nonzero when the consumer is exiting. Updated by signal
849 * handler and thread exit, read by threads.
851 extern int consumer_quit
;
854 * Set to nonzero when the consumer is exiting. Updated by signal
855 * handler and thread exit, read by threads.
857 extern int consumer_quit
;
859 /* Flag used to temporarily pause data consumption from testpoints. */
860 extern int data_consumption_paused
;
862 /* Return a human-readable consumer type string that is suitable for logging. */
864 const char *lttng_consumer_type_str(enum lttng_consumer_type type
)
867 case LTTNG_CONSUMER_UNKNOWN
:
869 case LTTNG_CONSUMER_KERNEL
:
871 case LTTNG_CONSUMER32_UST
:
872 return "32-bit user space";
873 case LTTNG_CONSUMER64_UST
:
874 return "64-bit user space";
881 * Init consumer data structures.
883 int lttng_consumer_init(void);
886 * Set the error socket for communication with a session daemon.
888 void lttng_consumer_set_error_sock(struct lttng_consumer_local_data
*ctx
,
892 * Set the command socket path for communication with a session daemon.
894 void lttng_consumer_set_command_sock_path(
895 struct lttng_consumer_local_data
*ctx
, char *sock
);
898 * Send return code to session daemon.
900 * Returns the return code of sendmsg : the number of bytes transmitted or -1
903 int lttng_consumer_send_error(struct lttng_consumer_local_data
*ctx
, int cmd
);
906 * Called from signal handler to ensure a clean exit.
908 void lttng_consumer_should_exit(struct lttng_consumer_local_data
*ctx
);
911 * Cleanup the daemon's socket on exit.
913 void lttng_consumer_cleanup(void);
916 * Poll on the should_quit pipe and the command socket return -1 on error and
917 * should exit, 0 if data is available on the command socket
919 int lttng_consumer_poll_socket(struct pollfd
*kconsumer_sockpoll
);
922 * Copy the fields from the channel that need to be accessed (read-only)
923 * directly from the stream.
925 void consumer_stream_update_channel_attributes(
926 struct lttng_consumer_stream
*stream
,
927 struct lttng_consumer_channel
*channel
);
929 struct lttng_consumer_stream
*consumer_allocate_stream(
930 struct lttng_consumer_channel
*channel
,
931 uint64_t channel_key
,
933 const char *channel_name
,
936 struct lttng_trace_chunk
*trace_chunk
,
939 enum consumer_channel_type type
,
940 unsigned int monitor
);
941 struct lttng_consumer_channel
*consumer_allocate_channel(uint64_t key
,
943 const uint64_t *chunk_id
,
944 const char *pathname
,
947 enum lttng_event_output output
,
948 uint64_t tracefile_size
,
949 uint64_t tracefile_count
,
950 uint64_t session_id_per_pid
,
951 unsigned int monitor
,
952 unsigned int live_timer_interval
,
953 bool is_in_live_session
,
954 const char *root_shm_path
,
955 const char *shm_path
);
956 void consumer_del_stream(struct lttng_consumer_stream
*stream
,
957 struct lttng_ht
*ht
);
958 void consumer_del_metadata_stream(struct lttng_consumer_stream
*stream
,
959 struct lttng_ht
*ht
);
960 int consumer_add_channel(struct lttng_consumer_channel
*channel
,
961 struct lttng_consumer_local_data
*ctx
);
962 void consumer_del_channel(struct lttng_consumer_channel
*channel
);
964 /* lttng-relayd consumer command */
965 struct consumer_relayd_sock_pair
*consumer_find_relayd(uint64_t key
);
966 int consumer_send_relayd_stream(struct lttng_consumer_stream
*stream
, char *path
);
967 int consumer_send_relayd_streams_sent(uint64_t net_seq_idx
);
968 void close_relayd_stream(struct lttng_consumer_stream
*stream
);
969 struct lttng_consumer_channel
*consumer_find_channel(uint64_t key
);
970 int consumer_handle_stream_before_relayd(struct lttng_consumer_stream
*stream
,
972 void consumer_steal_stream_key(int key
, struct lttng_ht
*ht
);
974 struct lttng_consumer_local_data
*lttng_consumer_create(
975 enum lttng_consumer_type type
,
976 ssize_t (*buffer_ready
)(struct lttng_consumer_stream
*stream
,
977 struct lttng_consumer_local_data
*ctx
,
978 bool locked_by_caller
),
979 int (*recv_channel
)(struct lttng_consumer_channel
*channel
),
980 int (*recv_stream
)(struct lttng_consumer_stream
*stream
),
981 int (*update_stream
)(uint64_t sessiond_key
, uint32_t state
));
982 void lttng_consumer_destroy(struct lttng_consumer_local_data
*ctx
);
983 ssize_t
lttng_consumer_on_read_subbuffer_mmap(
984 struct lttng_consumer_stream
*stream
,
985 const struct lttng_buffer_view
*buffer
,
986 unsigned long padding
);
987 ssize_t
lttng_consumer_on_read_subbuffer_splice(
988 struct lttng_consumer_local_data
*ctx
,
989 struct lttng_consumer_stream
*stream
, unsigned long len
,
990 unsigned long padding
);
991 int lttng_consumer_sample_snapshot_positions(struct lttng_consumer_stream
*stream
);
992 int lttng_consumer_take_snapshot(struct lttng_consumer_stream
*stream
);
993 int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream
*stream
,
995 int lttng_consumer_get_consumed_snapshot(struct lttng_consumer_stream
*stream
,
997 int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream
*stream
);
998 int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream
*stream
);
999 void *consumer_thread_metadata_poll(void *data
);
1000 void *consumer_thread_data_poll(void *data
);
1001 void *consumer_thread_sessiond_poll(void *data
);
1002 void *consumer_thread_channel_poll(void *data
);
1003 int lttng_consumer_recv_cmd(struct lttng_consumer_local_data
*ctx
,
1004 int sock
, struct pollfd
*consumer_sockpoll
);
1006 ssize_t
lttng_consumer_read_subbuffer(struct lttng_consumer_stream
*stream
,
1007 struct lttng_consumer_local_data
*ctx
,
1008 bool locked_by_caller
);
1009 int lttng_consumer_on_recv_stream(struct lttng_consumer_stream
*stream
);
1010 void consumer_add_relayd_socket(uint64_t net_seq_idx
, int sock_type
,
1011 struct lttng_consumer_local_data
*ctx
, int sock
,
1012 struct pollfd
*consumer_sockpoll
, struct lttcomm_relayd_sock
*relayd_sock
,
1013 uint64_t sessiond_id
, uint64_t relayd_session_id
);
1014 void consumer_flag_relayd_for_destroy(
1015 struct consumer_relayd_sock_pair
*relayd
);
1016 int consumer_data_pending(uint64_t id
);
1017 int consumer_send_status_msg(int sock
, int ret_code
);
1018 int consumer_send_status_channel(int sock
,
1019 struct lttng_consumer_channel
*channel
);
1020 void notify_thread_del_channel(struct lttng_consumer_local_data
*ctx
,
1022 void consumer_destroy_relayd(struct consumer_relayd_sock_pair
*relayd
);
1023 unsigned long consumer_get_consume_start_pos(unsigned long consumed_pos
,
1024 unsigned long produced_pos
, uint64_t nb_packets_per_stream
,
1025 uint64_t max_sb_size
);
1026 void consumer_add_data_stream(struct lttng_consumer_stream
*stream
);
1027 void consumer_del_stream_for_data(struct lttng_consumer_stream
*stream
);
1028 void consumer_add_metadata_stream(struct lttng_consumer_stream
*stream
);
1029 void consumer_del_stream_for_metadata(struct lttng_consumer_stream
*stream
);
1030 int consumer_create_index_file(struct lttng_consumer_stream
*stream
);
1031 int lttng_consumer_rotate_channel(struct lttng_consumer_channel
*channel
,
1032 uint64_t key
, uint64_t relayd_id
, uint32_t metadata
,
1033 struct lttng_consumer_local_data
*ctx
);
1034 int lttng_consumer_stream_is_rotate_ready(struct lttng_consumer_stream
*stream
);
1035 int lttng_consumer_rotate_stream(struct lttng_consumer_local_data
*ctx
,
1036 struct lttng_consumer_stream
*stream
);
1037 int lttng_consumer_rotate_ready_streams(struct lttng_consumer_channel
*channel
,
1038 uint64_t key
, struct lttng_consumer_local_data
*ctx
);
1039 void lttng_consumer_reset_stream_rotate_state(struct lttng_consumer_stream
*stream
);
1040 enum lttcomm_return_code
lttng_consumer_create_trace_chunk(
1041 const uint64_t *relayd_id
, uint64_t session_id
,
1043 time_t chunk_creation_timestamp
,
1044 const char *chunk_override_name
,
1045 const struct lttng_credentials
*credentials
,
1046 struct lttng_directory_handle
*chunk_directory_handle
);
1047 enum lttcomm_return_code
lttng_consumer_close_trace_chunk(
1048 const uint64_t *relayd_id
, uint64_t session_id
,
1049 uint64_t chunk_id
, time_t chunk_close_timestamp
,
1050 const enum lttng_trace_chunk_command_type
*close_command
,
1052 enum lttcomm_return_code
lttng_consumer_trace_chunk_exists(
1053 const uint64_t *relayd_id
, uint64_t session_id
,
1055 void lttng_consumer_cleanup_relayd(struct consumer_relayd_sock_pair
*relayd
);
1056 enum lttcomm_return_code
lttng_consumer_init_command(
1057 struct lttng_consumer_local_data
*ctx
,
1058 const lttng_uuid sessiond_uuid
);
1059 int lttng_consumer_clear_channel(struct lttng_consumer_channel
*channel
);
1060 enum lttcomm_return_code
lttng_consumer_open_channel_packets(
1061 struct lttng_consumer_channel
*channel
);
1062 int consumer_metadata_wakeup_pipe(const struct lttng_consumer_channel
*channel
);
1064 #endif /* LIB_CONSUMER_H */