2 * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * 2012 - David Goulet <dgoulet@efficios.com>
5 * 2018 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License, version 2 only,
9 * as published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 #ifndef LIB_CONSUMER_H
22 #define LIB_CONSUMER_H
27 #include <urcu/list.h>
29 #include <lttng/lttng.h>
31 #include <common/hashtable/hashtable.h>
32 #include <common/compat/fcntl.h>
33 #include <common/compat/uuid.h>
34 #include <common/sessiond-comm/sessiond-comm.h>
35 #include <common/pipe.h>
36 #include <common/index/ctf-index.h>
37 #include <common/trace-chunk-registry.h>
38 #include <common/credentials.h>
39 #include <common/buffer-view.h>
41 struct lttng_consumer_local_data
;
43 /* Commands for consumer */
44 enum lttng_consumer_command
{
45 LTTNG_CONSUMER_ADD_CHANNEL
,
46 LTTNG_CONSUMER_ADD_STREAM
,
47 /* pause, delete, active depending on fd state */
48 LTTNG_CONSUMER_UPDATE_STREAM
,
49 /* inform the consumer to quit when all fd has hang up */
50 LTTNG_CONSUMER_STOP
, /* deprecated */
51 LTTNG_CONSUMER_ADD_RELAYD_SOCKET
,
52 /* Inform the consumer to kill a specific relayd connection */
53 LTTNG_CONSUMER_DESTROY_RELAYD
,
54 /* Return to the sessiond if there is data pending for a session */
55 LTTNG_CONSUMER_DATA_PENDING
,
56 /* Consumer creates a channel and returns it to sessiond. */
57 LTTNG_CONSUMER_ASK_CHANNEL_CREATION
,
58 LTTNG_CONSUMER_GET_CHANNEL
,
59 LTTNG_CONSUMER_DESTROY_CHANNEL
,
60 LTTNG_CONSUMER_PUSH_METADATA
,
61 LTTNG_CONSUMER_CLOSE_METADATA
,
62 LTTNG_CONSUMER_SETUP_METADATA
,
63 LTTNG_CONSUMER_FLUSH_CHANNEL
,
64 LTTNG_CONSUMER_SNAPSHOT_CHANNEL
,
65 LTTNG_CONSUMER_SNAPSHOT_METADATA
,
66 LTTNG_CONSUMER_STREAMS_SENT
,
67 LTTNG_CONSUMER_DISCARDED_EVENTS
,
68 LTTNG_CONSUMER_LOST_PACKETS
,
69 LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL
,
70 LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE
,
71 LTTNG_CONSUMER_ROTATE_CHANNEL
,
73 LTTNG_CONSUMER_CREATE_TRACE_CHUNK
,
74 LTTNG_CONSUMER_CLOSE_TRACE_CHUNK
,
75 LTTNG_CONSUMER_TRACE_CHUNK_EXISTS
,
78 enum lttng_consumer_type
{
79 LTTNG_CONSUMER_UNKNOWN
= 0,
80 LTTNG_CONSUMER_KERNEL
,
85 enum consumer_endpoint_status
{
86 CONSUMER_ENDPOINT_ACTIVE
,
87 CONSUMER_ENDPOINT_INACTIVE
,
90 enum consumer_channel_output
{
91 CONSUMER_CHANNEL_MMAP
= 0,
92 CONSUMER_CHANNEL_SPLICE
= 1,
95 enum consumer_channel_type
{
96 CONSUMER_CHANNEL_TYPE_METADATA
= 0,
97 CONSUMER_CHANNEL_TYPE_DATA
= 1,
100 extern struct lttng_consumer_global_data 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 ustctl_consumer_channel
*uchan
;
165 unsigned char uuid
[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
;
304 * Perform any operation required to acknowledge
305 * the wake-up of a consumer stream (e.g. consume a byte on a wake-up pipe).
307 * Stream and channel locks are acquired during this call.
309 typedef int (*on_wake_up_cb
)(struct lttng_consumer_stream
*);
312 * Perform any operation required before a consumer stream is put
313 * to sleep before awaiting a data availability notification.
315 * Stream and channel locks are acquired during this call.
317 typedef int (*on_sleep_cb
)(struct lttng_consumer_stream
*,
318 struct lttng_consumer_local_data
*);
321 * Acquire the subbuffer at the current 'consumed' position.
323 * Stream and channel locks are acquired during this call.
325 typedef int (*get_next_subbuffer_cb
)(struct lttng_consumer_stream
*,
326 struct stream_subbuffer
*);
329 * Populate the stream_subbuffer's info member. The info to populate
330 * depends on the type (metadata/data) of the stream.
332 * Stream and channel locks are acquired during this call.
334 typedef int (*extract_subbuffer_info_cb
)(
335 struct lttng_consumer_stream
*, struct stream_subbuffer
*);
338 * Invoked after a subbuffer's info has been filled.
340 * Stream and channel locks are acquired during this call.
342 typedef int (*pre_consume_subbuffer_cb
)(struct lttng_consumer_stream
*,
343 const struct stream_subbuffer
*);
346 * Consume subbuffer contents.
348 * Stream and channel locks are acquired during this call.
350 typedef ssize_t (*consume_subbuffer_cb
)(struct lttng_consumer_local_data
*,
351 struct lttng_consumer_stream
*,
352 const struct stream_subbuffer
*);
355 * Release the current subbuffer and advance the 'consumed' position by
358 * Stream and channel locks are acquired during this call.
360 typedef int (*put_next_subbuffer_cb
)(struct lttng_consumer_stream
*,
361 struct stream_subbuffer
*);
364 * Invoked after consuming a subbuffer.
366 * Stream and channel locks are acquired during this call.
368 typedef int (*post_consume_cb
)(struct lttng_consumer_stream
*,
369 const struct stream_subbuffer
*,
370 struct lttng_consumer_local_data
*);
373 * Send a live beacon if no data is available.
375 * Stream and channel locks are acquired during this call.
377 typedef int (*send_live_beacon_cb
)(struct lttng_consumer_stream
*);
380 * Lock the stream and channel locks and any other stream-type specific
381 * lock that need to be acquired during the processing of an
382 * availability notification.
384 typedef void (*lock_cb
)(struct lttng_consumer_stream
*);
387 * Unlock the stream and channel locks and any other stream-type specific
388 * lock before sleeping until the next availability notification.
390 * Stream and channel locks are acquired during this call.
392 typedef void (*unlock_cb
)(struct lttng_consumer_stream
*);
395 * Invoked when a subbuffer's metadata version does not match the last
396 * known metadata version.
398 * Stream and channel locks are acquired during this call.
400 typedef void (*reset_metadata_cb
)(struct lttng_consumer_stream
*);
403 * Internal representation of the streams, sessiond_key is used to identify
406 struct lttng_consumer_stream
{
407 /* HT node used by the data_ht and metadata_ht */
408 struct lttng_ht_node_u64 node
;
409 /* stream indexed per channel key node */
410 struct lttng_ht_node_u64 node_channel_id
;
411 /* HT node used in consumer_data.stream_list_ht */
412 struct lttng_ht_node_u64 node_session_id
;
413 /* Pointer to associated channel. */
414 struct lttng_consumer_channel
*chan
;
416 * Current trace chunk. Holds a reference to the trace chunk.
417 * `chunk` can be NULL when a stream is not associated to a chunk, e.g.
418 * when it was created in the context of a no-output session.
420 struct lttng_trace_chunk
*trace_chunk
;
422 /* Key by which the stream is indexed for 'node'. */
425 * File descriptor of the data output file. This can be either a file or a
426 * socket fd for relayd streaming.
428 int out_fd
; /* output file to write the data */
429 /* Write position in the output file descriptor */
431 /* Amount of bytes written to the output */
432 uint64_t output_written
;
435 int hangup_flush_done
;
438 * Whether the stream is in a "complete" state (e.g. it does not have a
439 * partially written sub-buffer.
441 * Initialized to "false" on stream creation (first packet is empty).
443 * The various transitions of the quiescent state are:
444 * - On "start" tracing: set to false, since the stream is not
446 * - On "stop" tracing: if !quiescent -> flush FINAL (update
447 * timestamp_end), and set to true; the stream has entered a
448 * complete/quiescent state.
449 * - On "destroy" or stream/application hang-up: if !quiescent ->
450 * flush FINAL, and set to true.
452 * NOTE: Update and read are protected by the stream lock.
457 * True if the sequence number is not available (lttng-modules < 2.8).
459 bool sequence_number_unavailable
;
462 * metadata_timer_lock protects flags waiting_on_metadata and
463 * missed_metadata_flush.
465 pthread_mutex_t metadata_timer_lock
;
467 * Flag set when awaiting metadata to be pushed. Used in the
468 * timer thread to skip waiting on the stream (and stream lock) to
469 * ensure we can proceed to flushing metadata in live mode.
471 bool waiting_on_metadata
;
472 /* Raised when a timer misses a metadata flush. */
473 bool missed_metadata_flush
;
475 enum lttng_event_output output
;
476 /* Maximum subbuffer size (in bytes). */
477 unsigned long max_sb_size
;
480 * Still used by the kernel for MMAP output. For UST, the ustctl getter is
481 * used for the mmap base and offset.
484 unsigned long mmap_len
;
489 /* Network sequence number. Indicating on which relayd socket it goes. */
490 uint64_t net_seq_idx
;
492 * Indicate if this stream was successfully sent to a relayd. This is set
493 * after the refcount of the relayd is incremented and is checked when the
494 * stream is closed before decrementing the refcount in order to avoid an
497 unsigned int sent_to_relayd
;
499 /* Identify if the stream is the metadata */
500 unsigned int metadata_flag
;
502 * Last known metadata version, reset the metadata file in case
505 uint64_t metadata_version
;
506 /* Used when the stream is set for network streaming */
507 uint64_t relayd_stream_id
;
509 * When sending a stream packet to a relayd, this number is used to track
510 * the packet sent by the consumer and seen by the relayd. When sending the
511 * data header to the relayd, this number is sent and if the transmission
512 * was successful, it is incremented.
514 * Even if the full data is not fully transmitted it won't matter since
515 * only two possible error can happen after that where either the relayd
516 * died or a read error is detected on the stream making this value useless
519 * This value SHOULD be read/updated atomically or with the lock acquired.
521 uint64_t next_net_seq_num
;
523 * Lock to use the stream FDs since they are used between threads.
525 * This is nested INSIDE the consumer_data lock.
526 * This is nested INSIDE the channel lock.
527 * This is nested INSIDE the channel timer lock.
528 * This is nested OUTSIDE the metadata cache lock.
529 * This is nested OUTSIDE consumer_relayd_sock_pair lock.
531 pthread_mutex_t lock
;
532 /* Tracing session id */
535 * Indicates if the stream end point is still active or not (network
536 * streaming or local file system). The thread "owning" the stream is
537 * handling this status and can be notified of a state change through the
538 * consumer data appropriate pipe.
540 enum consumer_endpoint_status endpoint_status
;
541 /* Stream name. Format is: <channel_name>_<cpu_number> */
542 char name
[LTTNG_SYMBOL_NAME_LEN
];
543 /* Internal state of libustctl. */
544 struct ustctl_consumer_stream
*ustream
;
545 struct cds_list_head send_node
;
546 /* On-disk circular buffer */
547 uint64_t tracefile_size_current
;
548 uint64_t tracefile_count_current
;
550 * Monitor or not the streams of this channel meaning this indicates if the
551 * streams should be sent to the data/metadata thread or added to the no
552 * monitor list of the channel.
554 unsigned int monitor
;
556 * Indicate if the stream is globally visible meaning that it has been
557 * added to the multiple hash tables. If *not* set, NO lock should be
558 * acquired in the destroy path.
560 unsigned int globally_visible
;
562 * Pipe to wake up the metadata poll thread when the UST metadata
565 int ust_metadata_poll_pipe
[2];
567 * How much metadata was read from the metadata cache and sent
570 uint64_t ust_metadata_pushed
;
572 * Copy of the last discarded event value to detect the overflow of
575 uint64_t last_discarded_events
;
576 /* Copy of the sequence number of the last packet extracted. */
577 uint64_t last_sequence_number
;
579 * Index file object of the index file for this stream.
581 struct lttng_index_file
*index_file
;
584 * Local pipe to extract data when using splice.
589 * Rendez-vous point between data and metadata stream in live mode.
591 pthread_cond_t metadata_rdv
;
592 pthread_mutex_t metadata_rdv_lock
;
595 * rotate_position represents the packet sequence number of the last
596 * packet which belongs to the current trace chunk prior to the rotation.
597 * When that position is reached, this tracefile can be closed and a
598 * new one is created in channel_read_only_attributes.path.
600 uint64_t rotate_position
;
603 * Read-only copies of channel values. We cannot safely access the
604 * channel from a stream, so we need to have a local copy of these
605 * fields in the stream object. These fields should be removed from
606 * the stream objects when we introduce refcounting.
609 uint64_t tracefile_size
;
610 } channel_read_only_attributes
;
613 * Flag to inform the data or metadata thread that a stream is
614 * ready to be rotated.
618 /* Indicate if the stream still has some data to be read. */
619 unsigned int has_data
:1;
621 * Inform the consumer or relay to reset the metadata
622 * file before writing in it (regeneration).
624 unsigned int reset_metadata_flag
:1;
627 * Invoked in the order of declaration.
628 * See callback type definitions.
631 on_wake_up_cb on_wake_up
;
632 get_next_subbuffer_cb get_next_subbuffer
;
633 extract_subbuffer_info_cb extract_subbuffer_info
;
634 pre_consume_subbuffer_cb pre_consume_subbuffer
;
635 reset_metadata_cb reset_metadata
;
636 consume_subbuffer_cb consume_subbuffer
;
637 put_next_subbuffer_cb put_next_subbuffer
;
638 post_consume_cb post_consume
;
639 send_live_beacon_cb send_live_beacon
;
640 on_sleep_cb on_sleep
;
642 } read_subbuffer_ops
;
643 struct metadata_bucket
*metadata_bucket
;
647 * Internal representation of a relayd socket pair.
649 struct consumer_relayd_sock_pair
{
650 /* Network sequence number. */
651 uint64_t net_seq_idx
;
652 /* Number of stream associated with this relayd */
656 * This flag indicates whether or not we should destroy this object. The
657 * destruction should ONLY occurs when this flag is set and the refcount is
660 unsigned int destroy_flag
;
663 * Mutex protecting the control socket to avoid out of order packets
664 * between threads sending data to the relayd. Since metadata data is sent
665 * over that socket, at least two sendmsg() are needed (header + data)
666 * creating a race for packets to overlap between threads using it.
668 * This is nested INSIDE the consumer_data lock.
669 * This is nested INSIDE the stream lock.
671 pthread_mutex_t ctrl_sock_mutex
;
673 /* Control socket. Command and metadata are passed over it */
674 struct lttcomm_relayd_sock control_sock
;
677 * We don't need a mutex at this point since we only splice or write single
678 * large chunk of data with a header appended at the begining. Moreover,
679 * this socket is for now only used in a single thread.
681 struct lttcomm_relayd_sock data_sock
;
682 struct lttng_ht_node_u64 node
;
684 /* Session id on both sides for the sockets. */
685 uint64_t relayd_session_id
;
686 uint64_t sessiond_session_id
;
687 struct lttng_consumer_local_data
*ctx
;
691 * UST consumer local data to the program. One or more instance per
694 struct lttng_consumer_local_data
{
696 * Function to call when data is available on a buffer.
697 * Returns the number of bytes read, or negative error value.
699 ssize_t (*on_buffer_ready
)(struct lttng_consumer_stream
*stream
,
700 struct lttng_consumer_local_data
*ctx
,
701 bool locked_by_caller
);
703 * function to call when we receive a new channel, it receives a
704 * newly allocated channel, depending on the return code of this
705 * function, the new channel will be handled by the application
709 * > 0 (success, FD is kept by application)
710 * == 0 (success, FD is left to library)
713 int (*on_recv_channel
)(struct lttng_consumer_channel
*channel
);
715 * function to call when we receive a new stream, it receives a
716 * newly allocated stream, depending on the return code of this
717 * function, the new stream will be handled by the application
721 * > 0 (success, FD is kept by application)
722 * == 0 (success, FD is left to library)
725 int (*on_recv_stream
)(struct lttng_consumer_stream
*stream
);
727 * function to call when a stream is getting updated by the session
728 * daemon, this function receives the sessiond key and the new
729 * state, depending on the return code of this function the
730 * update of state for the stream is handled by the application
734 * > 0 (success, FD is kept by application)
735 * == 0 (success, FD is left to library)
738 int (*on_update_stream
)(uint64_t sessiond_key
, uint32_t state
);
739 enum lttng_consumer_type type
;
740 /* socket to communicate errors with sessiond */
741 int consumer_error_socket
;
742 /* socket to ask metadata to sessiond. */
743 int consumer_metadata_socket
;
745 * Protect consumer_metadata_socket.
747 * This is nested OUTSIDE the metadata cache lock.
749 pthread_mutex_t metadata_socket_lock
;
750 /* socket to exchange commands with sessiond */
751 char *consumer_command_sock_path
;
752 /* communication with splice */
753 int consumer_channel_pipe
[2];
754 /* Data stream poll thread pipe. To transfer data stream to the thread */
755 struct lttng_pipe
*consumer_data_pipe
;
758 * Data thread use that pipe to catch wakeup from read subbuffer that
759 * detects that there is still data to be read for the stream encountered.
760 * Before doing so, the stream is flagged to indicate that there is still
763 * Both pipes (read/write) are owned and used inside the data thread.
765 struct lttng_pipe
*consumer_wakeup_pipe
;
766 /* Indicate if the wakeup thread has been notified. */
767 unsigned int has_wakeup
:1;
769 /* to let the signal handler wake up the fd receiver thread */
770 int consumer_should_quit
[2];
771 /* Metadata poll thread pipe. Transfer metadata stream to it */
772 struct lttng_pipe
*consumer_metadata_pipe
;
774 * Pipe used by the channel monitoring timers to provide state samples
775 * to the session daemon (write-only).
777 int channel_monitor_pipe
;
778 LTTNG_OPTIONAL(lttng_uuid
) sessiond_uuid
;
782 * Library-level data. One instance per process.
784 struct lttng_consumer_global_data
{
786 * At this time, this lock is used to ensure coherence between the count
787 * and number of element in the hash table. It's also a protection for
788 * concurrent read/write between threads.
790 * This is nested OUTSIDE the stream lock.
791 * This is nested OUTSIDE the consumer_relayd_sock_pair lock.
793 pthread_mutex_t lock
;
796 * Number of streams in the data stream hash table declared outside.
797 * Protected by consumer_data.lock.
801 /* Channel hash table protected by consumer_data.lock. */
802 struct lttng_ht
*channel_ht
;
803 /* Channel hash table indexed by session id. */
804 struct lttng_ht
*channels_by_session_id_ht
;
806 * Flag specifying if the local array of FDs needs update in the
807 * poll function. Protected by consumer_data.lock.
809 unsigned int need_update
;
810 enum lttng_consumer_type type
;
813 * Relayd socket(s) hashtable indexed by network sequence number. Each
814 * stream has an index which associate the right relayd socket to use.
816 struct lttng_ht
*relayd_ht
;
819 * This hash table contains all streams (metadata and data) indexed by
820 * session id. In other words, the ht is indexed by session id and each
821 * bucket contains the list of associated streams.
823 * This HT uses the "node_session_id" of the consumer stream.
825 struct lttng_ht
*stream_list_ht
;
828 * This HT uses the "node_channel_id" of the consumer stream.
830 struct lttng_ht
*stream_per_chan_id_ht
;
833 * Trace chunk registry indexed by (session_id, chunk_id).
835 struct lttng_trace_chunk_registry
*chunk_registry
;
839 * Set to nonzero when the consumer is exiting. Updated by signal
840 * handler and thread exit, read by threads.
842 extern int consumer_quit
;
845 * Set to nonzero when the consumer is exiting. Updated by signal
846 * handler and thread exit, read by threads.
848 extern int consumer_quit
;
850 /* Flag used to temporarily pause data consumption from testpoints. */
851 extern int data_consumption_paused
;
853 /* Return a human-readable consumer type string that is suitable for logging. */
855 const char *lttng_consumer_type_str(enum lttng_consumer_type type
)
858 case LTTNG_CONSUMER_UNKNOWN
:
860 case LTTNG_CONSUMER_KERNEL
:
862 case LTTNG_CONSUMER32_UST
:
863 return "32-bit user space";
864 case LTTNG_CONSUMER64_UST
:
865 return "64-bit user space";
872 * Init consumer data structures.
874 int lttng_consumer_init(void);
877 * Set the error socket for communication with a session daemon.
879 void lttng_consumer_set_error_sock(struct lttng_consumer_local_data
*ctx
,
883 * Set the command socket path for communication with a session daemon.
885 void lttng_consumer_set_command_sock_path(
886 struct lttng_consumer_local_data
*ctx
, char *sock
);
889 * Send return code to session daemon.
891 * Returns the return code of sendmsg : the number of bytes transmitted or -1
894 int lttng_consumer_send_error(struct lttng_consumer_local_data
*ctx
, int cmd
);
897 * Called from signal handler to ensure a clean exit.
899 void lttng_consumer_should_exit(struct lttng_consumer_local_data
*ctx
);
902 * Cleanup the daemon's socket on exit.
904 void lttng_consumer_cleanup(void);
907 * Poll on the should_quit pipe and the command socket return -1 on error and
908 * should exit, 0 if data is available on the command socket
910 int lttng_consumer_poll_socket(struct pollfd
*kconsumer_sockpoll
);
913 * Copy the fields from the channel that need to be accessed (read-only)
914 * directly from the stream.
916 void consumer_stream_update_channel_attributes(
917 struct lttng_consumer_stream
*stream
,
918 struct lttng_consumer_channel
*channel
);
920 struct lttng_consumer_stream
*consumer_allocate_stream(
921 struct lttng_consumer_channel
*channel
,
922 uint64_t channel_key
,
924 const char *channel_name
,
927 struct lttng_trace_chunk
*trace_chunk
,
930 enum consumer_channel_type type
,
931 unsigned int monitor
);
932 struct lttng_consumer_channel
*consumer_allocate_channel(uint64_t key
,
934 const uint64_t *chunk_id
,
935 const char *pathname
,
938 enum lttng_event_output output
,
939 uint64_t tracefile_size
,
940 uint64_t tracefile_count
,
941 uint64_t session_id_per_pid
,
942 unsigned int monitor
,
943 unsigned int live_timer_interval
,
944 bool is_in_live_session
,
945 const char *root_shm_path
,
946 const char *shm_path
);
947 void consumer_del_stream(struct lttng_consumer_stream
*stream
,
948 struct lttng_ht
*ht
);
949 void consumer_del_metadata_stream(struct lttng_consumer_stream
*stream
,
950 struct lttng_ht
*ht
);
951 int consumer_add_channel(struct lttng_consumer_channel
*channel
,
952 struct lttng_consumer_local_data
*ctx
);
953 void consumer_del_channel(struct lttng_consumer_channel
*channel
);
955 /* lttng-relayd consumer command */
956 struct consumer_relayd_sock_pair
*consumer_find_relayd(uint64_t key
);
957 int consumer_send_relayd_stream(struct lttng_consumer_stream
*stream
, char *path
);
958 int consumer_send_relayd_streams_sent(uint64_t net_seq_idx
);
959 void close_relayd_stream(struct lttng_consumer_stream
*stream
);
960 struct lttng_consumer_channel
*consumer_find_channel(uint64_t key
);
961 int consumer_handle_stream_before_relayd(struct lttng_consumer_stream
*stream
,
963 void consumer_steal_stream_key(int key
, struct lttng_ht
*ht
);
965 struct lttng_consumer_local_data
*lttng_consumer_create(
966 enum lttng_consumer_type type
,
967 ssize_t (*buffer_ready
)(struct lttng_consumer_stream
*stream
,
968 struct lttng_consumer_local_data
*ctx
,
969 bool locked_by_caller
),
970 int (*recv_channel
)(struct lttng_consumer_channel
*channel
),
971 int (*recv_stream
)(struct lttng_consumer_stream
*stream
),
972 int (*update_stream
)(uint64_t sessiond_key
, uint32_t state
));
973 void lttng_consumer_destroy(struct lttng_consumer_local_data
*ctx
);
974 ssize_t
lttng_consumer_on_read_subbuffer_mmap(
975 struct lttng_consumer_stream
*stream
,
976 const struct lttng_buffer_view
*buffer
,
977 unsigned long padding
);
978 ssize_t
lttng_consumer_on_read_subbuffer_splice(
979 struct lttng_consumer_local_data
*ctx
,
980 struct lttng_consumer_stream
*stream
, unsigned long len
,
981 unsigned long padding
);
982 int lttng_consumer_sample_snapshot_positions(struct lttng_consumer_stream
*stream
);
983 int lttng_consumer_take_snapshot(struct lttng_consumer_stream
*stream
);
984 int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream
*stream
,
986 int lttng_consumer_get_consumed_snapshot(struct lttng_consumer_stream
*stream
,
988 int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream
*stream
);
989 int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream
*stream
);
990 void *consumer_thread_metadata_poll(void *data
);
991 void *consumer_thread_data_poll(void *data
);
992 void *consumer_thread_sessiond_poll(void *data
);
993 void *consumer_thread_channel_poll(void *data
);
994 int lttng_consumer_recv_cmd(struct lttng_consumer_local_data
*ctx
,
995 int sock
, struct pollfd
*consumer_sockpoll
);
997 ssize_t
lttng_consumer_read_subbuffer(struct lttng_consumer_stream
*stream
,
998 struct lttng_consumer_local_data
*ctx
,
999 bool locked_by_caller
);
1000 int lttng_consumer_on_recv_stream(struct lttng_consumer_stream
*stream
);
1001 void consumer_add_relayd_socket(uint64_t net_seq_idx
, int sock_type
,
1002 struct lttng_consumer_local_data
*ctx
, int sock
,
1003 struct pollfd
*consumer_sockpoll
, struct lttcomm_relayd_sock
*relayd_sock
,
1004 uint64_t sessiond_id
, uint64_t relayd_session_id
);
1005 void consumer_flag_relayd_for_destroy(
1006 struct consumer_relayd_sock_pair
*relayd
);
1007 int consumer_data_pending(uint64_t id
);
1008 int consumer_send_status_msg(int sock
, int ret_code
);
1009 int consumer_send_status_channel(int sock
,
1010 struct lttng_consumer_channel
*channel
);
1011 void notify_thread_del_channel(struct lttng_consumer_local_data
*ctx
,
1013 void consumer_destroy_relayd(struct consumer_relayd_sock_pair
*relayd
);
1014 unsigned long consumer_get_consume_start_pos(unsigned long consumed_pos
,
1015 unsigned long produced_pos
, uint64_t nb_packets_per_stream
,
1016 uint64_t max_sb_size
);
1017 void consumer_add_data_stream(struct lttng_consumer_stream
*stream
);
1018 void consumer_del_stream_for_data(struct lttng_consumer_stream
*stream
);
1019 void consumer_add_metadata_stream(struct lttng_consumer_stream
*stream
);
1020 void consumer_del_stream_for_metadata(struct lttng_consumer_stream
*stream
);
1021 int consumer_create_index_file(struct lttng_consumer_stream
*stream
);
1022 int lttng_consumer_rotate_channel(struct lttng_consumer_channel
*channel
,
1023 uint64_t key
, uint64_t relayd_id
, uint32_t metadata
,
1024 struct lttng_consumer_local_data
*ctx
);
1025 int lttng_consumer_stream_is_rotate_ready(struct lttng_consumer_stream
*stream
);
1026 int lttng_consumer_rotate_stream(struct lttng_consumer_local_data
*ctx
,
1027 struct lttng_consumer_stream
*stream
);
1028 int lttng_consumer_rotate_ready_streams(struct lttng_consumer_channel
*channel
,
1029 uint64_t key
, struct lttng_consumer_local_data
*ctx
);
1030 void lttng_consumer_reset_stream_rotate_state(struct lttng_consumer_stream
*stream
);
1031 enum lttcomm_return_code
lttng_consumer_create_trace_chunk(
1032 const uint64_t *relayd_id
, uint64_t session_id
,
1034 time_t chunk_creation_timestamp
,
1035 const char *chunk_override_name
,
1036 const struct lttng_credentials
*credentials
,
1037 struct lttng_directory_handle
*chunk_directory_handle
);
1038 enum lttcomm_return_code
lttng_consumer_close_trace_chunk(
1039 const uint64_t *relayd_id
, uint64_t session_id
,
1040 uint64_t chunk_id
, time_t chunk_close_timestamp
,
1041 const enum lttng_trace_chunk_command_type
*close_command
,
1043 enum lttcomm_return_code
lttng_consumer_trace_chunk_exists(
1044 const uint64_t *relayd_id
, uint64_t session_id
,
1046 void lttng_consumer_cleanup_relayd(struct consumer_relayd_sock_pair
*relayd
);
1047 enum lttcomm_return_code
lttng_consumer_init_command(
1048 struct lttng_consumer_local_data
*ctx
,
1049 const lttng_uuid sessiond_uuid
);
1051 #endif /* LIB_CONSUMER_H */