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
18 #include <urcu/list.h>
20 #include <lttng/lttng.h>
22 #include <common/hashtable/hashtable.h>
23 #include <common/compat/fcntl.h>
24 #include <common/uuid.h>
25 #include <common/sessiond-comm/sessiond-comm.h>
26 #include <common/pipe.h>
27 #include <common/index/ctf-index.h>
28 #include <common/trace-chunk-registry.h>
29 #include <common/credentials.h>
30 #include <common/buffer-view.h>
31 #include <common/dynamic-array.h>
33 struct lttng_consumer_local_data
;
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
,
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
,
72 enum lttng_consumer_type
{
73 LTTNG_CONSUMER_UNKNOWN
= 0,
74 LTTNG_CONSUMER_KERNEL
,
79 enum consumer_endpoint_status
{
80 CONSUMER_ENDPOINT_ACTIVE
,
81 CONSUMER_ENDPOINT_INACTIVE
,
84 enum consumer_channel_output
{
85 CONSUMER_CHANNEL_MMAP
= 0,
86 CONSUMER_CHANNEL_SPLICE
= 1,
89 enum consumer_channel_type
{
90 CONSUMER_CHANNEL_TYPE_METADATA
= 0,
91 CONSUMER_CHANNEL_TYPE_DATA
= 1,
94 enum sync_metadata_status
{
95 SYNC_METADATA_STATUS_NEW_DATA
,
96 SYNC_METADATA_STATUS_NO_DATA
,
97 SYNC_METADATA_STATUS_ERROR
,
100 extern struct lttng_consumer_global_data the_consumer_data
;
103 struct cds_list_head head
;
108 struct consumer_metadata_cache
;
110 struct lttng_consumer_channel
{
111 /* Is the channel published in the channel hash tables? */
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
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. */
125 /* Number of streams referencing this channel */
127 /* Tracing session id on the session daemon side. */
129 /* Current trace chunk of the session in which this channel exists. */
130 struct lttng_trace_chunk
*trace_chunk
;
132 * Session id when requesting metadata to the session daemon for
133 * a session with per-PID buffers.
135 uint64_t session_id_per_pid
;
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
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
147 char pathname
[PATH_MAX
];
149 char name
[LTTNG_SYMBOL_NAME_LEN
];
150 /* Relayd id of the channel. -1ULL if it does not apply. */
153 * Number of streams NOT initialized yet. This is used in order to not
154 * delete this channel if streams are getting initialized.
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
;
163 uid_t ust_app_uid
; /* Application UID. */
164 struct lttng_ust_ctl_consumer_channel
*uchan
;
165 unsigned char uuid
[LTTNG_UUID_STR_LEN
];
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.
171 struct stream_list streams
;
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.
178 struct lttng_consumer_stream
*metadata_stream
;
182 /* Node within channel thread ht */
183 struct lttng_ht_node_u64 wait_fd_node
;
185 /* Metadata cache is metadata channel */
186 struct consumer_metadata_cache
*metadata_cache
;
188 /* For UST metadata periodical flush */
189 int switch_timer_enabled
;
190 timer_t switch_timer
;
191 int switch_timer_error
;
193 /* For the live mode */
194 int live_timer_enabled
;
196 int live_timer_error
;
197 /* Channel is part of a live session ? */
200 /* For channel monitoring timer. */
201 int monitor_timer_enabled
;
202 timer_t monitor_timer
;
204 /* On-disk circular buffer */
205 uint64_t tracefile_size
;
206 uint64_t tracefile_count
;
208 * Monitor or not the streams of this channel meaning this indicates if the
209 * streams should be sent to the data/metadata thread or added to the no
210 * monitor list of the channel.
212 unsigned int monitor
;
217 * This lock protects against concurrent update of channel.
219 * This is nested INSIDE the consumer data lock.
220 * This is nested OUTSIDE the channel timer lock.
221 * This is nested OUTSIDE the metadata cache lock.
222 * This is nested OUTSIDE stream lock.
223 * This is nested OUTSIDE consumer_relayd_sock_pair lock.
225 pthread_mutex_t lock
;
228 * Channel teardown lock.
230 * This lock protect against teardown of channel. It is _never_
231 * taken by the timer handler.
233 * This is nested INSIDE the consumer data lock.
234 * This is nested INSIDE the channel lock.
235 * This is nested OUTSIDE the metadata cache lock.
236 * This is nested OUTSIDE stream lock.
237 * This is nested OUTSIDE consumer_relayd_sock_pair lock.
239 pthread_mutex_t timer_lock
;
241 /* Timer value in usec for live streaming. */
242 unsigned int live_timer_interval
;
246 char root_shm_path
[PATH_MAX
];
247 char shm_path
[PATH_MAX
];
248 /* Only set for UST channels. */
249 LTTNG_OPTIONAL(struct lttng_credentials
) buffer_credentials
;
250 /* Total number of discarded events for that channel. */
251 uint64_t discarded_events
;
252 /* Total number of missed packets due to overwriting (overwrite). */
253 uint64_t lost_packets
;
255 bool streams_sent_to_relayd
;
258 struct stream_subbuffer
{
261 * CONSUMER_CHANNEL_SPLICE
262 * No ownership assumed.
265 /* CONSUMER_CHANNEL_MMAP */
266 struct lttng_buffer_view buffer
;
270 * Common members are fine to access through either
271 * union entries (as per C11, Common Initial Sequence).
274 unsigned long subbuf_size
;
275 unsigned long padded_subbuf_size
;
278 * Left unset when unsupported.
280 * Indicates that this is the last sub-buffer of
281 * a series of sub-buffer that makes-up a coherent
282 * (parseable) unit of metadata.
284 LTTNG_OPTIONAL(bool) coherent
;
287 unsigned long subbuf_size
;
288 unsigned long padded_subbuf_size
;
289 uint64_t packet_size
;
290 uint64_t content_size
;
291 uint64_t timestamp_begin
;
292 uint64_t timestamp_end
;
293 uint64_t events_discarded
;
294 /* Left unset when unsupported. */
295 LTTNG_OPTIONAL(uint64_t) sequence_number
;
297 /* Left unset when unsupported. */
298 LTTNG_OPTIONAL(uint64_t) stream_instance_id
;
303 enum get_next_subbuffer_status
{
304 GET_NEXT_SUBBUFFER_STATUS_OK
,
305 GET_NEXT_SUBBUFFER_STATUS_NO_DATA
,
306 GET_NEXT_SUBBUFFER_STATUS_ERROR
,
310 * Perform any operation required to acknowledge
311 * the wake-up of a consumer stream (e.g. consume a byte on a wake-up pipe).
313 * Stream and channel locks are acquired during this call.
315 typedef int (*on_wake_up_cb
)(struct lttng_consumer_stream
*);
318 * Perform any operation required before a consumer stream is put
319 * to sleep before awaiting a data availability notification.
321 * Stream and channel locks are acquired during this call.
323 typedef int (*on_sleep_cb
)(struct lttng_consumer_stream
*,
324 struct lttng_consumer_local_data
*);
327 * Acquire the subbuffer at the current 'consumed' position.
329 * Stream and channel locks are acquired during this call.
331 typedef enum get_next_subbuffer_status (*get_next_subbuffer_cb
)(
332 struct lttng_consumer_stream
*, struct stream_subbuffer
*);
335 * Populate the stream_subbuffer's info member. The info to populate
336 * depends on the type (metadata/data) of the stream.
338 * Stream and channel locks are acquired during this call.
340 typedef int (*extract_subbuffer_info_cb
)(
341 struct lttng_consumer_stream
*, struct stream_subbuffer
*);
344 * Invoked after a subbuffer's info has been filled.
346 * Stream and channel locks are acquired during this call.
348 typedef int (*pre_consume_subbuffer_cb
)(struct lttng_consumer_stream
*,
349 const struct stream_subbuffer
*);
352 * Consume subbuffer contents.
354 * Stream and channel locks are acquired during this call.
356 typedef ssize_t (*consume_subbuffer_cb
)(struct lttng_consumer_local_data
*,
357 struct lttng_consumer_stream
*,
358 const struct stream_subbuffer
*);
361 * Release the current subbuffer and advance the 'consumed' position by
364 * Stream and channel locks are acquired during this call.
366 typedef int (*put_next_subbuffer_cb
)(struct lttng_consumer_stream
*,
367 struct stream_subbuffer
*);
370 * Invoked after consuming a subbuffer.
372 * Stream and channel locks are acquired during this call.
374 typedef int (*post_consume_cb
)(struct lttng_consumer_stream
*,
375 const struct stream_subbuffer
*,
376 struct lttng_consumer_local_data
*);
379 * Send a live beacon if no data is available.
381 * Stream and channel locks are acquired during this call.
383 typedef int (*send_live_beacon_cb
)(struct lttng_consumer_stream
*);
386 * Lock the stream and channel locks and any other stream-type specific
387 * lock that need to be acquired during the processing of an
388 * availability notification.
390 typedef void (*lock_cb
)(struct lttng_consumer_stream
*);
393 * Unlock the stream and channel locks and any other stream-type specific
394 * lock before sleeping until the next availability notification.
396 * Stream and channel locks are acquired during this call.
398 typedef void (*unlock_cb
)(struct lttng_consumer_stream
*);
401 * Assert that the stream and channel lock and any other stream type specific
402 * lock that need to be acquired during the processing of a read_subbuffer
403 * operation is acquired.
405 typedef void (*assert_locked_cb
)(struct lttng_consumer_stream
*);
408 * Invoked when a subbuffer's metadata version does not match the last
409 * known metadata version.
411 * Stream and channel locks are acquired during this call.
413 typedef void (*reset_metadata_cb
)(struct lttng_consumer_stream
*);
416 * Internal representation of the streams, sessiond_key is used to identify
419 struct lttng_consumer_stream
{
420 /* HT node used by the data_ht and metadata_ht */
421 struct lttng_ht_node_u64 node
;
422 /* stream indexed per channel key node */
423 struct lttng_ht_node_u64 node_channel_id
;
424 /* HT node used in consumer_data.stream_list_ht */
425 struct lttng_ht_node_u64 node_session_id
;
427 * List used by channels to reference streams that are not yet globally
430 struct cds_list_head send_node
;
431 /* Pointer to associated channel. */
432 struct lttng_consumer_channel
*chan
;
434 * Current trace chunk. Holds a reference to the trace chunk.
435 * `chunk` can be NULL when a stream is not associated to a chunk, e.g.
436 * when it was created in the context of a no-output session.
438 struct lttng_trace_chunk
*trace_chunk
;
440 /* Key by which the stream is indexed for 'node'. */
443 * File descriptor of the data output file. This can be either a file or a
444 * socket fd for relayd streaming.
446 int out_fd
; /* output file to write the data */
447 /* Write position in the output file descriptor */
449 /* Amount of bytes written to the output */
450 uint64_t output_written
;
453 int hangup_flush_done
;
456 * Whether the stream is in a "complete" state (e.g. it does not have a
457 * partially written sub-buffer.
459 * Initialized to "false" on stream creation (first packet is empty).
461 * The various transitions of the quiescent state are:
462 * - On "start" tracing: set to false, since the stream is not
464 * - On "stop" tracing: if !quiescent -> flush FINAL (update
465 * timestamp_end), and set to true; the stream has entered a
466 * complete/quiescent state.
467 * - On "destroy" or stream/application hang-up: if !quiescent ->
468 * flush FINAL, and set to true.
470 * NOTE: Update and read are protected by the stream lock.
475 * True if the sequence number is not available (lttng-modules < 2.8).
477 bool sequence_number_unavailable
;
480 * metadata_timer_lock protects flags waiting_on_metadata and
481 * missed_metadata_flush.
483 pthread_mutex_t metadata_timer_lock
;
485 * Flag set when awaiting metadata to be pushed. Used in the
486 * timer thread to skip waiting on the stream (and stream lock) to
487 * ensure we can proceed to flushing metadata in live mode.
489 bool waiting_on_metadata
;
490 /* Raised when a timer misses a metadata flush. */
491 bool missed_metadata_flush
;
493 enum lttng_event_output output
;
494 /* Maximum subbuffer size (in bytes). */
495 unsigned long max_sb_size
;
498 * Still used by the kernel for MMAP output. For UST, the ustctl getter is
499 * used for the mmap base and offset.
502 unsigned long mmap_len
;
507 /* Network sequence number. Indicating on which relayd socket it goes. */
508 uint64_t net_seq_idx
;
510 * Indicate if this stream was successfully sent to a relayd. This is set
511 * after the refcount of the relayd is incremented and is checked when the
512 * stream is closed before decrementing the refcount in order to avoid an
515 unsigned int sent_to_relayd
;
517 /* Identify if the stream is the metadata */
518 unsigned int metadata_flag
;
520 * Last known metadata version, reset the metadata file in case
523 uint64_t metadata_version
;
524 /* Used when the stream is set for network streaming */
525 uint64_t relayd_stream_id
;
527 * When sending a stream packet to a relayd, this number is used to track
528 * the packet sent by the consumer and seen by the relayd. When sending the
529 * data header to the relayd, this number is sent and if the transmission
530 * was successful, it is incremented.
532 * Even if the full data is not fully transmitted it won't matter since
533 * only two possible error can happen after that where either the relayd
534 * died or a read error is detected on the stream making this value useless
537 * This value SHOULD be read/updated atomically or with the lock acquired.
539 uint64_t next_net_seq_num
;
541 * Lock to use the stream FDs since they are used between threads.
543 * This is nested INSIDE the consumer_data lock.
544 * This is nested INSIDE the channel lock.
545 * This is nested INSIDE the channel timer lock.
546 * This is nested OUTSIDE the metadata cache lock.
547 * This is nested OUTSIDE consumer_relayd_sock_pair lock.
549 pthread_mutex_t lock
;
550 /* Tracing session id */
553 * Indicates if the stream end point is still active or not (network
554 * streaming or local file system). The thread "owning" the stream is
555 * handling this status and can be notified of a state change through the
556 * consumer data appropriate pipe.
558 enum consumer_endpoint_status endpoint_status
;
559 /* Stream name. Format is: <channel_name>_<cpu_number> */
560 char name
[LTTNG_SYMBOL_NAME_LEN
];
561 /* Internal state of libustctl. */
562 struct lttng_ust_ctl_consumer_stream
*ustream
;
563 /* On-disk circular buffer */
564 uint64_t tracefile_size_current
;
565 uint64_t tracefile_count_current
;
567 * Monitor or not the streams of this channel meaning this indicates if the
568 * streams should be sent to the data/metadata thread or added to the no
569 * monitor list of the channel.
571 unsigned int monitor
;
573 * Indicate if the stream is globally visible meaning that it has been
574 * added to the multiple hash tables. If *not* set, NO lock should be
575 * acquired in the destroy path.
577 unsigned int globally_visible
;
579 * Pipe to wake up the metadata poll thread when the UST metadata
582 int ust_metadata_poll_pipe
[2];
584 * How much metadata was read from the metadata cache and sent
587 uint64_t ust_metadata_pushed
;
589 * Copy of the last discarded event value to detect the overflow of
592 uint64_t last_discarded_events
;
593 /* Copy of the sequence number of the last packet extracted. */
594 uint64_t last_sequence_number
;
596 * Index file object of the index file for this stream.
598 struct lttng_index_file
*index_file
;
601 * Local pipe to extract data when using splice.
606 * Rendez-vous point between data and metadata stream in live mode.
608 pthread_cond_t metadata_rdv
;
609 pthread_mutex_t metadata_rdv_lock
;
612 * rotate_position represents the packet sequence number of the last
613 * packet which belongs to the current trace chunk prior to the rotation.
614 * When that position is reached, this tracefile can be closed and a
615 * new one is created in channel_read_only_attributes.path.
617 uint64_t rotate_position
;
619 /* Whether or not a packet was opened during the current trace chunk. */
620 bool opened_packet_in_current_trace_chunk
;
623 * Read-only copies of channel values. We cannot safely access the
624 * channel from a stream, so we need to have a local copy of these
625 * fields in the stream object. These fields should be removed from
626 * the stream objects when we introduce refcounting.
629 uint64_t tracefile_size
;
630 } channel_read_only_attributes
;
633 * Flag to inform the data or metadata thread that a stream is
634 * ready to be rotated.
638 /* Indicate if the stream still has some data to be read. */
639 unsigned int has_data
:1;
641 * Inform the consumer or relay to reset the metadata
642 * file before writing in it (regeneration).
644 unsigned int reset_metadata_flag
:1;
647 * Invoked in the order of declaration.
648 * See callback type definitions.
651 on_wake_up_cb on_wake_up
;
652 get_next_subbuffer_cb get_next_subbuffer
;
653 extract_subbuffer_info_cb extract_subbuffer_info
;
654 pre_consume_subbuffer_cb pre_consume_subbuffer
;
655 reset_metadata_cb reset_metadata
;
656 consume_subbuffer_cb consume_subbuffer
;
657 put_next_subbuffer_cb put_next_subbuffer
;
658 struct lttng_dynamic_array post_consume_cbs
;
659 send_live_beacon_cb send_live_beacon
;
660 on_sleep_cb on_sleep
;
662 assert_locked_cb assert_locked
;
663 } read_subbuffer_ops
;
664 struct metadata_bucket
*metadata_bucket
;
668 * Internal representation of a relayd socket pair.
670 struct consumer_relayd_sock_pair
{
671 /* Network sequence number. */
672 uint64_t net_seq_idx
;
673 /* Number of stream associated with this relayd */
677 * This flag indicates whether or not we should destroy this object. The
678 * destruction should ONLY occurs when this flag is set and the refcount is
681 unsigned int destroy_flag
;
684 * Mutex protecting the control socket to avoid out of order packets
685 * between threads sending data to the relayd. Since metadata data is sent
686 * over that socket, at least two sendmsg() are needed (header + data)
687 * creating a race for packets to overlap between threads using it.
689 * This is nested INSIDE the consumer_data lock.
690 * This is nested INSIDE the stream lock.
692 pthread_mutex_t ctrl_sock_mutex
;
694 /* Control socket. Command and metadata are passed over it */
695 struct lttcomm_relayd_sock control_sock
;
698 * We don't need a mutex at this point since we only splice or write single
699 * large chunk of data with a header appended at the begining. Moreover,
700 * this socket is for now only used in a single thread.
702 struct lttcomm_relayd_sock data_sock
;
703 struct lttng_ht_node_u64 node
;
705 /* Session id on both sides for the sockets. */
706 uint64_t relayd_session_id
;
707 uint64_t sessiond_session_id
;
708 struct lttng_consumer_local_data
*ctx
;
712 * UST consumer local data to the program. One or more instance per
715 struct lttng_consumer_local_data
{
717 * Function to call when data is available on a buffer.
718 * Returns the number of bytes read, or negative error value.
720 ssize_t (*on_buffer_ready
)(struct lttng_consumer_stream
*stream
,
721 struct lttng_consumer_local_data
*ctx
,
722 bool locked_by_caller
);
724 * function to call when we receive a new channel, it receives a
725 * newly allocated channel, depending on the return code of this
726 * function, the new channel 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_channel
)(struct lttng_consumer_channel
*channel
);
736 * function to call when we receive a new stream, it receives a
737 * newly allocated stream, depending on the return code of this
738 * function, the new stream will be handled by the application
742 * > 0 (success, FD is kept by application)
743 * == 0 (success, FD is left to library)
746 int (*on_recv_stream
)(struct lttng_consumer_stream
*stream
);
748 * function to call when a stream is getting updated by the session
749 * daemon, this function receives the sessiond key and the new
750 * state, depending on the return code of this function the
751 * update of state for the stream is handled by the application
755 * > 0 (success, FD is kept by application)
756 * == 0 (success, FD is left to library)
759 int (*on_update_stream
)(uint64_t sessiond_key
, uint32_t state
);
760 enum lttng_consumer_type type
;
761 /* socket to communicate errors with sessiond */
762 int consumer_error_socket
;
763 /* socket to ask metadata to sessiond. */
764 int consumer_metadata_socket
;
766 * Protect consumer_metadata_socket.
768 * This is nested OUTSIDE the metadata cache lock.
770 pthread_mutex_t metadata_socket_lock
;
771 /* socket to exchange commands with sessiond */
772 char *consumer_command_sock_path
;
773 /* communication with splice */
774 int consumer_channel_pipe
[2];
775 /* Data stream poll thread pipe. To transfer data stream to the thread */
776 struct lttng_pipe
*consumer_data_pipe
;
779 * Data thread use that pipe to catch wakeup from read subbuffer that
780 * detects that there is still data to be read for the stream encountered.
781 * Before doing so, the stream is flagged to indicate that there is still
784 * Both pipes (read/write) are owned and used inside the data thread.
786 struct lttng_pipe
*consumer_wakeup_pipe
;
787 /* Indicate if the wakeup thread has been notified. */
788 unsigned int has_wakeup
:1;
790 /* to let the signal handler wake up the fd receiver thread */
791 int consumer_should_quit
[2];
792 /* Metadata poll thread pipe. Transfer metadata stream to it */
793 struct lttng_pipe
*consumer_metadata_pipe
;
795 * Pipe used by the channel monitoring timers to provide state samples
796 * to the session daemon (write-only).
798 int channel_monitor_pipe
;
799 LTTNG_OPTIONAL(lttng_uuid
) sessiond_uuid
;
803 * Library-level data. One instance per process.
805 struct lttng_consumer_global_data
{
807 * At this time, this lock is used to ensure coherence between the count
808 * and number of element in the hash table. It's also a protection for
809 * concurrent read/write between threads.
811 * This is nested OUTSIDE the stream lock.
812 * This is nested OUTSIDE the consumer_relayd_sock_pair lock.
814 pthread_mutex_t lock
;
817 * Number of streams in the data stream hash table declared outside.
818 * Protected by consumer_data.lock.
822 /* Channel hash table protected by consumer_data.lock. */
823 struct lttng_ht
*channel_ht
;
824 /* Channel hash table indexed by session id. */
825 struct lttng_ht
*channels_by_session_id_ht
;
827 * Flag specifying if the local array of FDs needs update in the
828 * poll function. Protected by consumer_data.lock.
830 unsigned int need_update
;
831 enum lttng_consumer_type type
;
834 * Relayd socket(s) hashtable indexed by network sequence number. Each
835 * stream has an index which associate the right relayd socket to use.
837 struct lttng_ht
*relayd_ht
;
840 * This hash table contains all streams (metadata and data) indexed by
841 * session id. In other words, the ht is indexed by session id and each
842 * bucket contains the list of associated streams.
844 * This HT uses the "node_session_id" of the consumer stream.
846 struct lttng_ht
*stream_list_ht
;
849 * This HT uses the "node_channel_id" of the consumer stream.
851 struct lttng_ht
*stream_per_chan_id_ht
;
854 * Trace chunk registry indexed by (session_id, chunk_id).
856 struct lttng_trace_chunk_registry
*chunk_registry
;
860 * Set to nonzero when the consumer is exiting. Updated by signal
861 * handler and thread exit, read by threads.
863 extern int consumer_quit
;
866 * Set to nonzero when the consumer is exiting. Updated by signal
867 * handler and thread exit, read by threads.
869 extern int consumer_quit
;
871 /* Flag used to temporarily pause data consumption from testpoints. */
872 extern int data_consumption_paused
;
874 /* Return a human-readable consumer type string that is suitable for logging. */
876 const char *lttng_consumer_type_str(enum lttng_consumer_type type
)
879 case LTTNG_CONSUMER_UNKNOWN
:
881 case LTTNG_CONSUMER_KERNEL
:
883 case LTTNG_CONSUMER32_UST
:
884 return "32-bit user space";
885 case LTTNG_CONSUMER64_UST
:
886 return "64-bit user space";
893 * Init consumer data structures.
895 int lttng_consumer_init(void);
898 * Set the error socket for communication with a session daemon.
900 void lttng_consumer_set_error_sock(struct lttng_consumer_local_data
*ctx
,
904 * Set the command socket path for communication with a session daemon.
906 void lttng_consumer_set_command_sock_path(
907 struct lttng_consumer_local_data
*ctx
, char *sock
);
910 * Send return code to session daemon.
912 * Returns the return code of sendmsg : the number of bytes transmitted or -1
915 int lttng_consumer_send_error(struct lttng_consumer_local_data
*ctx
, int cmd
);
918 * Called from signal handler to ensure a clean exit.
920 void lttng_consumer_should_exit(struct lttng_consumer_local_data
*ctx
);
923 * Cleanup the daemon's socket on exit.
925 void lttng_consumer_cleanup(void);
928 * Poll on the should_quit pipe and the command socket return -1 on error and
929 * should exit, 0 if data is available on the command socket
931 int lttng_consumer_poll_socket(struct pollfd
*kconsumer_sockpoll
);
934 * Copy the fields from the channel that need to be accessed (read-only)
935 * directly from the stream.
937 void consumer_stream_update_channel_attributes(
938 struct lttng_consumer_stream
*stream
,
939 struct lttng_consumer_channel
*channel
);
941 struct lttng_consumer_stream
*consumer_allocate_stream(
942 struct lttng_consumer_channel
*channel
,
943 uint64_t channel_key
,
945 const char *channel_name
,
948 struct lttng_trace_chunk
*trace_chunk
,
951 enum consumer_channel_type type
,
952 unsigned int monitor
);
953 struct lttng_consumer_channel
*consumer_allocate_channel(uint64_t key
,
955 const uint64_t *chunk_id
,
956 const char *pathname
,
959 enum lttng_event_output output
,
960 uint64_t tracefile_size
,
961 uint64_t tracefile_count
,
962 uint64_t session_id_per_pid
,
963 unsigned int monitor
,
964 unsigned int live_timer_interval
,
965 bool is_in_live_session
,
966 const char *root_shm_path
,
967 const char *shm_path
);
968 void consumer_del_stream(struct lttng_consumer_stream
*stream
,
969 struct lttng_ht
*ht
);
970 void consumer_del_metadata_stream(struct lttng_consumer_stream
*stream
,
971 struct lttng_ht
*ht
);
972 int consumer_add_channel(struct lttng_consumer_channel
*channel
,
973 struct lttng_consumer_local_data
*ctx
);
974 void consumer_del_channel(struct lttng_consumer_channel
*channel
);
976 /* lttng-relayd consumer command */
977 struct consumer_relayd_sock_pair
*consumer_find_relayd(uint64_t key
);
978 int consumer_send_relayd_stream(struct lttng_consumer_stream
*stream
, char *path
);
979 int consumer_send_relayd_streams_sent(uint64_t net_seq_idx
);
980 void close_relayd_stream(struct lttng_consumer_stream
*stream
);
981 struct lttng_consumer_channel
*consumer_find_channel(uint64_t key
);
982 int consumer_handle_stream_before_relayd(struct lttng_consumer_stream
*stream
,
984 void consumer_steal_stream_key(int key
, struct lttng_ht
*ht
);
986 struct lttng_consumer_local_data
*lttng_consumer_create(
987 enum lttng_consumer_type type
,
988 ssize_t (*buffer_ready
)(struct lttng_consumer_stream
*stream
,
989 struct lttng_consumer_local_data
*ctx
,
990 bool locked_by_caller
),
991 int (*recv_channel
)(struct lttng_consumer_channel
*channel
),
992 int (*recv_stream
)(struct lttng_consumer_stream
*stream
),
993 int (*update_stream
)(uint64_t sessiond_key
, uint32_t state
));
994 void lttng_consumer_destroy(struct lttng_consumer_local_data
*ctx
);
995 ssize_t
lttng_consumer_on_read_subbuffer_mmap(
996 struct lttng_consumer_stream
*stream
,
997 const struct lttng_buffer_view
*buffer
,
998 unsigned long padding
);
999 ssize_t
lttng_consumer_on_read_subbuffer_splice(
1000 struct lttng_consumer_local_data
*ctx
,
1001 struct lttng_consumer_stream
*stream
, unsigned long len
,
1002 unsigned long padding
);
1003 int lttng_consumer_sample_snapshot_positions(struct lttng_consumer_stream
*stream
);
1004 int lttng_consumer_take_snapshot(struct lttng_consumer_stream
*stream
);
1005 int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream
*stream
,
1006 unsigned long *pos
);
1007 int lttng_consumer_get_consumed_snapshot(struct lttng_consumer_stream
*stream
,
1008 unsigned long *pos
);
1009 int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream
*stream
);
1010 int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream
*stream
);
1011 void *consumer_thread_metadata_poll(void *data
);
1012 void *consumer_thread_data_poll(void *data
);
1013 void *consumer_thread_sessiond_poll(void *data
);
1014 void *consumer_thread_channel_poll(void *data
);
1015 int lttng_consumer_recv_cmd(struct lttng_consumer_local_data
*ctx
,
1016 int sock
, struct pollfd
*consumer_sockpoll
);
1018 ssize_t
lttng_consumer_read_subbuffer(struct lttng_consumer_stream
*stream
,
1019 struct lttng_consumer_local_data
*ctx
,
1020 bool locked_by_caller
);
1021 int lttng_consumer_on_recv_stream(struct lttng_consumer_stream
*stream
);
1022 void consumer_add_relayd_socket(uint64_t net_seq_idx
,
1024 struct lttng_consumer_local_data
*ctx
,
1026 struct pollfd
*consumer_sockpoll
,
1027 uint64_t sessiond_id
,
1028 uint64_t relayd_session_id
,
1029 uint32_t relayd_version_major
,
1030 uint32_t relayd_version_minor
,
1031 enum lttcomm_sock_proto relayd_socket_protocol
);
1032 void consumer_flag_relayd_for_destroy(
1033 struct consumer_relayd_sock_pair
*relayd
);
1034 int consumer_data_pending(uint64_t id
);
1035 int consumer_send_status_msg(int sock
, int ret_code
);
1036 int consumer_send_status_channel(int sock
,
1037 struct lttng_consumer_channel
*channel
);
1038 void notify_thread_del_channel(struct lttng_consumer_local_data
*ctx
,
1040 void consumer_destroy_relayd(struct consumer_relayd_sock_pair
*relayd
);
1041 unsigned long consumer_get_consume_start_pos(unsigned long consumed_pos
,
1042 unsigned long produced_pos
, 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
, uint64_t relayd_id
, uint32_t metadata
,
1051 struct lttng_consumer_local_data
*ctx
);
1052 int lttng_consumer_stream_is_rotate_ready(struct lttng_consumer_stream
*stream
);
1053 int lttng_consumer_rotate_stream(struct lttng_consumer_local_data
*ctx
,
1054 struct lttng_consumer_stream
*stream
);
1055 int lttng_consumer_rotate_ready_streams(struct lttng_consumer_channel
*channel
,
1056 uint64_t key
, struct lttng_consumer_local_data
*ctx
);
1057 void lttng_consumer_reset_stream_rotate_state(struct lttng_consumer_stream
*stream
);
1058 enum lttcomm_return_code
lttng_consumer_create_trace_chunk(
1059 const uint64_t *relayd_id
, uint64_t session_id
,
1061 time_t chunk_creation_timestamp
,
1062 const char *chunk_override_name
,
1063 const struct lttng_credentials
*credentials
,
1064 struct lttng_directory_handle
*chunk_directory_handle
);
1065 enum lttcomm_return_code
lttng_consumer_close_trace_chunk(
1066 const uint64_t *relayd_id
, uint64_t session_id
,
1067 uint64_t chunk_id
, time_t chunk_close_timestamp
,
1068 const enum lttng_trace_chunk_command_type
*close_command
,
1070 enum lttcomm_return_code
lttng_consumer_trace_chunk_exists(
1071 const uint64_t *relayd_id
, uint64_t session_id
,
1073 void lttng_consumer_cleanup_relayd(struct consumer_relayd_sock_pair
*relayd
);
1074 enum lttcomm_return_code
lttng_consumer_init_command(
1075 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
lttng_consumer_open_channel_packets(
1079 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
);
1083 #endif /* LIB_CONSUMER_H */