document metadata_switch_timer() locking constraints
[lttng-tools.git] / src / common / consumer.h
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1/*
2 * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
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3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * 2012 - David Goulet <dgoulet@efficios.com>
3bd1e081 5 *
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6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License, version 2 only,
8 * as published by the Free Software Foundation.
3bd1e081 9 *
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10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
3bd1e081 14 *
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15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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18 */
19
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20#ifndef LIB_CONSUMER_H
21#define LIB_CONSUMER_H
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22
23#include <limits.h>
24#include <poll.h>
6df2e2c9 25#include <unistd.h>
ffe60014 26#include <urcu/list.h>
e4421fec 27
3bd1e081 28#include <lttng/lttng.h>
10a8a223 29
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30#include <common/hashtable/hashtable.h>
31#include <common/compat/fcntl.h>
ffe60014 32#include <common/compat/uuid.h>
00e2e675 33#include <common/sessiond-comm/sessiond-comm.h>
acdb9057 34#include <common/pipe.h>
3bd1e081 35
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36/* Commands for consumer */
37enum lttng_consumer_command {
38 LTTNG_CONSUMER_ADD_CHANNEL,
39 LTTNG_CONSUMER_ADD_STREAM,
40 /* pause, delete, active depending on fd state */
41 LTTNG_CONSUMER_UPDATE_STREAM,
42 /* inform the consumer to quit when all fd has hang up */
43 LTTNG_CONSUMER_STOP,
00e2e675 44 LTTNG_CONSUMER_ADD_RELAYD_SOCKET,
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45 /* Inform the consumer to kill a specific relayd connection */
46 LTTNG_CONSUMER_DESTROY_RELAYD,
53632229 47 /* Return to the sessiond if there is data pending for a session */
6d805429 48 LTTNG_CONSUMER_DATA_PENDING,
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49 /* Consumer creates a channel and returns it to sessiond. */
50 LTTNG_CONSUMER_ASK_CHANNEL_CREATION,
51 LTTNG_CONSUMER_GET_CHANNEL,
52 LTTNG_CONSUMER_DESTROY_CHANNEL,
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53 LTTNG_CONSUMER_PUSH_METADATA,
54 LTTNG_CONSUMER_CLOSE_METADATA,
55 LTTNG_CONSUMER_SETUP_METADATA,
7972aab2 56 LTTNG_CONSUMER_FLUSH_CHANNEL,
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57 LTTNG_CONSUMER_SNAPSHOT_CHANNEL,
58 LTTNG_CONSUMER_SNAPSHOT_METADATA,
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59};
60
61/* State of each fd in consumer */
62enum lttng_consumer_stream_state {
63 LTTNG_CONSUMER_ACTIVE_STREAM,
64 LTTNG_CONSUMER_PAUSE_STREAM,
65 LTTNG_CONSUMER_DELETE_STREAM,
66};
67
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68enum lttng_consumer_type {
69 LTTNG_CONSUMER_UNKNOWN = 0,
70 LTTNG_CONSUMER_KERNEL,
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71 LTTNG_CONSUMER64_UST,
72 LTTNG_CONSUMER32_UST,
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73};
74
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75enum consumer_endpoint_status {
76 CONSUMER_ENDPOINT_ACTIVE,
77 CONSUMER_ENDPOINT_INACTIVE,
78};
79
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80enum consumer_channel_output {
81 CONSUMER_CHANNEL_MMAP = 0,
82 CONSUMER_CHANNEL_SPLICE = 1,
83};
84
85enum consumer_channel_type {
86 CONSUMER_CHANNEL_TYPE_METADATA = 0,
d88aee68 87 CONSUMER_CHANNEL_TYPE_DATA = 1,
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88};
89
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90extern struct lttng_consumer_global_data consumer_data;
91
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92struct stream_list {
93 struct cds_list_head head;
94 unsigned int count;
95};
96
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97/* Stub. */
98struct consumer_metadata_cache;
99
3bd1e081 100struct lttng_consumer_channel {
ffe60014 101 /* HT node used for consumer_data.channel_ht */
d88aee68 102 struct lttng_ht_node_u64 node;
ffe60014 103 /* Indexed key. Incremented value in the consumer. */
d88aee68 104 uint64_t key;
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105 /* Number of streams referencing this channel */
106 int refcount;
107 /* Tracing session id on the session daemon side. */
108 uint64_t session_id;
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109 /*
110 * Session id when requesting metadata to the session daemon for
111 * a session with per-PID buffers.
112 */
113 uint64_t session_id_per_pid;
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114 /* Channel trace file path name. */
115 char pathname[PATH_MAX];
116 /* Channel name. */
117 char name[LTTNG_SYMBOL_NAME_LEN];
118 /* UID and GID of the channel. */
119 uid_t uid;
120 gid_t gid;
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121 /* Relayd id of the channel. -1ULL if it does not apply. */
122 uint64_t relayd_id;
c30aaa51 123 /*
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124 * Number of streams NOT initialized yet. This is used in order to not
125 * delete this channel if streams are getting initialized.
c30aaa51 126 */
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127 unsigned int nb_init_stream_left;
128 /* Output type (mmap or splice). */
129 enum consumer_channel_output output;
130 /* Channel type for stream */
131 enum consumer_channel_type type;
c30aaa51 132
3bd1e081 133 /* For UST */
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134 struct ustctl_consumer_channel *uchan;
135 unsigned char uuid[UUID_STR_LEN];
136 /*
137 * Temporary stream list used to store the streams once created and waiting
138 * to be sent to the session daemon by receiving the
139 * LTTNG_CONSUMER_GET_CHANNEL.
140 */
141 struct stream_list streams;
07b86b52 142
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143 /*
144 * Set if the channel is metadata. We keep a reference to the stream
145 * because we have to flush data once pushed by the session daemon. For a
146 * regular channel, this is always set to NULL.
147 */
148 struct lttng_consumer_stream *metadata_stream;
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149
150 /* for UST */
151 int wait_fd;
152 /* Node within channel thread ht */
153 struct lttng_ht_node_u64 wait_fd_node;
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154
155 /* Metadata cache is metadata channel */
156 struct consumer_metadata_cache *metadata_cache;
157 /* For metadata periodical flush */
158 int switch_timer_enabled;
159 timer_t switch_timer;
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160 int switch_timer_error;
161
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162 /* On-disk circular buffer */
163 uint64_t tracefile_size;
164 uint64_t tracefile_count;
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165 /*
166 * Monitor or not the streams of this channel meaning this indicates if the
167 * streams should be sent to the data/metadata thread or added to the no
168 * monitor list of the channel.
169 */
170 unsigned int monitor;
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171
172 /*
173 * Channel lock.
174 *
175 * This is nested INSIDE the consumer data lock.
176 * This is nested OUTSIDE the metadata cache lock.
177 * This is nested OUTSIDE stream lock.
178 * This is nested OUTSIDE consumer_relayd_sock_pair lock.
179 */
180 pthread_mutex_t lock;
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181};
182
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183/*
184 * Internal representation of the streams, sessiond_key is used to identify
185 * uniquely a stream.
186 */
187struct lttng_consumer_stream {
53632229 188 /* HT node used by the data_ht and metadata_ht */
d88aee68 189 struct lttng_ht_node_u64 node;
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190 /* stream indexed per channel key node */
191 struct lttng_ht_node_u64 node_channel_id;
53632229 192 /* HT node used in consumer_data.stream_list_ht */
d88aee68 193 struct lttng_ht_node_u64 node_session_id;
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194 /* Pointer to associated channel. */
195 struct lttng_consumer_channel *chan;
196
197 /* Key by which the stream is indexed for 'node'. */
d88aee68 198 uint64_t key;
3bd1e081 199 /*
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200 * File descriptor of the data output file. This can be either a file or a
201 * socket fd for relayd streaming.
3bd1e081 202 */
3bd1e081 203 int out_fd; /* output file to write the data */
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204 /* Write position in the output file descriptor */
205 off_t out_fd_offset;
3bd1e081 206 enum lttng_consumer_stream_state state;
b5c5fc29 207 int shm_fd_is_copy;
4078b776 208 int data_read;
d056b477 209 int hangup_flush_done;
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210 enum lttng_event_output output;
211 /* Maximum subbuffer size. */
212 unsigned long max_sb_size;
213
214 /*
215 * Still used by the kernel for MMAP output. For UST, the ustctl getter is
216 * used for the mmap base and offset.
217 */
218 void *mmap_base;
219 unsigned long mmap_len;
220
221 /* For UST */
222
223 int wait_fd;
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224 /* UID/GID of the user owning the session to which stream belongs */
225 uid_t uid;
226 gid_t gid;
00e2e675 227 /* Network sequence number. Indicating on which relayd socket it goes. */
d88aee68 228 uint64_t net_seq_idx;
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229 /*
230 * Indicate if this stream was successfully sent to a relayd. This is set
231 * after the refcount of the relayd is incremented and is checked when the
232 * stream is closed before decrementing the refcount in order to avoid an
233 * unbalanced state.
234 */
235 unsigned int sent_to_relayd;
236
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237 /* Identify if the stream is the metadata */
238 unsigned int metadata_flag;
239 /* Used when the stream is set for network streaming */
240 uint64_t relayd_stream_id;
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241 /*
242 * When sending a stream packet to a relayd, this number is used to track
243 * the packet sent by the consumer and seen by the relayd. When sending the
244 * data header to the relayd, this number is sent and if the transmission
245 * was successful, it is incremented.
246 *
247 * Even if the full data is not fully transmitted it won't matter since
248 * only two possible error can happen after that where either the relayd
249 * died or a read error is detected on the stream making this value useless
250 * after that.
251 *
252 * This value SHOULD be read/updated atomically or with the lock acquired.
253 */
173af62f 254 uint64_t next_net_seq_num;
63281d5d 255 /*
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256 * Lock to use the stream FDs since they are used between threads.
257 *
258 * This is nested INSIDE the consumer_data lock.
73811ecc 259 * This is nested INSIDE the metadata cache lock.
a9838785 260 * This is nested INSIDE the channel lock.
74251bb8 261 * This is nested OUTSIDE consumer_relayd_sock_pair lock.
63281d5d 262 */
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263 pthread_mutex_t lock;
264 /* Tracing session id */
265 uint64_t session_id;
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266 /*
267 * Indicates if the stream end point is still active or not (network
268 * streaming or local file system). The thread "owning" the stream is
269 * handling this status and can be notified of a state change through the
270 * consumer data appropriate pipe.
271 */
272 enum consumer_endpoint_status endpoint_status;
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273 /* Stream name. Format is: <channel_name>_<cpu_number> */
274 char name[LTTNG_SYMBOL_NAME_LEN];
275 /* Internal state of libustctl. */
276 struct ustctl_consumer_stream *ustream;
277 struct cds_list_head send_node;
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278 /* On-disk circular buffer */
279 uint64_t tracefile_size_current;
280 uint64_t tracefile_count_current;
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281 /*
282 * Monitor or not the streams of this channel meaning this indicates if the
283 * streams should be sent to the data/metadata thread or added to the no
284 * monitor list of the channel.
285 */
286 unsigned int monitor;
287 /*
288 * Indicate if the stream is globally visible meaning that it has been
289 * added to the multiple hash tables. If *not* set, NO lock should be
290 * acquired in the destroy path.
291 */
292 unsigned int globally_visible;
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293 /*
294 * Pipe to wake up the metadata poll thread when the UST metadata
295 * cache is updated.
296 */
297 int ust_metadata_poll_pipe[2];
298 /*
299 * How much metadata was read from the metadata cache and sent
300 * to the channel.
301 */
302 uint64_t ust_metadata_pushed;
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303};
304
305/*
306 * Internal representation of a relayd socket pair.
307 */
308struct consumer_relayd_sock_pair {
309 /* Network sequence number. */
da009f2c 310 uint64_t net_seq_idx;
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311 /* Number of stream associated with this relayd */
312 unsigned int refcount;
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313
314 /*
315 * This flag indicates whether or not we should destroy this object. The
316 * destruction should ONLY occurs when this flag is set and the refcount is
317 * set to zero.
318 */
319 unsigned int destroy_flag;
320
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321 /*
322 * Mutex protecting the control socket to avoid out of order packets
323 * between threads sending data to the relayd. Since metadata data is sent
324 * over that socket, at least two sendmsg() are needed (header + data)
325 * creating a race for packets to overlap between threads using it.
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326 *
327 * This is nested INSIDE the consumer_data lock.
328 * This is nested INSIDE the stream lock.
51d7db73 329 */
00e2e675 330 pthread_mutex_t ctrl_sock_mutex;
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331
332 /* Control socket. Command and metadata are passed over it */
6151a90f 333 struct lttcomm_relayd_sock control_sock;
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334
335 /*
336 * We don't need a mutex at this point since we only splice or write single
337 * large chunk of data with a header appended at the begining. Moreover,
338 * this socket is for now only used in a single thread.
339 */
6151a90f 340 struct lttcomm_relayd_sock data_sock;
d88aee68 341 struct lttng_ht_node_u64 node;
c5b6f4f0 342
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343 /* Session id on both sides for the sockets. */
344 uint64_t relayd_session_id;
345 uint64_t sessiond_session_id;
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346};
347
348/*
349 * UST consumer local data to the program. One or more instance per
350 * process.
351 */
352struct lttng_consumer_local_data {
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353 /*
354 * Function to call when data is available on a buffer.
355 * Returns the number of bytes read, or negative error value.
356 */
357 ssize_t (*on_buffer_ready)(struct lttng_consumer_stream *stream,
d41f73b7 358 struct lttng_consumer_local_data *ctx);
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359 /*
360 * function to call when we receive a new channel, it receives a
361 * newly allocated channel, depending on the return code of this
362 * function, the new channel will be handled by the application
363 * or the library.
364 *
365 * Returns:
366 * > 0 (success, FD is kept by application)
367 * == 0 (success, FD is left to library)
368 * < 0 (error)
369 */
370 int (*on_recv_channel)(struct lttng_consumer_channel *channel);
371 /*
372 * function to call when we receive a new stream, it receives a
373 * newly allocated stream, depending on the return code of this
374 * function, the new stream will be handled by the application
375 * or the library.
376 *
377 * Returns:
378 * > 0 (success, FD is kept by application)
379 * == 0 (success, FD is left to library)
380 * < 0 (error)
381 */
382 int (*on_recv_stream)(struct lttng_consumer_stream *stream);
383 /*
384 * function to call when a stream is getting updated by the session
385 * daemon, this function receives the sessiond key and the new
386 * state, depending on the return code of this function the
387 * update of state for the stream is handled by the application
388 * or the library.
389 *
390 * Returns:
391 * > 0 (success, FD is kept by application)
392 * == 0 (success, FD is left to library)
393 * < 0 (error)
394 */
30319bcb 395 int (*on_update_stream)(uint64_t sessiond_key, uint32_t state);
331744e3 396 enum lttng_consumer_type type;
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397 /* socket to communicate errors with sessiond */
398 int consumer_error_socket;
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399 /* socket to ask metadata to sessiond */
400 int consumer_metadata_socket;
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401 /* socket to exchange commands with sessiond */
402 char *consumer_command_sock_path;
403 /* communication with splice */
404 int consumer_thread_pipe[2];
d8ef542d 405 int consumer_channel_pipe[2];
fb3a43a9 406 int consumer_splice_metadata_pipe[2];
50f8ae69 407 /* Data stream poll thread pipe. To transfer data stream to the thread */
acdb9057 408 struct lttng_pipe *consumer_data_pipe;
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409 /* to let the signal handler wake up the fd receiver thread */
410 int consumer_should_quit[2];
fb3a43a9 411 /* Metadata poll thread pipe. Transfer metadata stream to it */
13886d2d 412 struct lttng_pipe *consumer_metadata_pipe;
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413};
414
415/*
416 * Library-level data. One instance per process.
417 */
418struct lttng_consumer_global_data {
419 /*
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420 * At this time, this lock is used to ensure coherence between the count
421 * and number of element in the hash table. It's also a protection for
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422 * concurrent read/write between threads.
423 *
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424 * This is nested OUTSIDE the stream lock.
425 * This is nested OUTSIDE the consumer_relayd_sock_pair lock.
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426 */
427 pthread_mutex_t lock;
e4421fec 428
3bd1e081 429 /*
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430 * Number of streams in the data stream hash table declared outside.
431 * Protected by consumer_data.lock.
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432 */
433 int stream_count;
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434
435 /* Channel hash table protected by consumer_data.lock. */
e4421fec 436 struct lttng_ht *channel_ht;
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437 /*
438 * Flag specifying if the local array of FDs needs update in the
439 * poll function. Protected by consumer_data.lock.
440 */
441 unsigned int need_update;
442 enum lttng_consumer_type type;
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443
444 /*
445 * Relayd socket(s) hashtable indexed by network sequence number. Each
446 * stream has an index which associate the right relayd socket to use.
447 */
448 struct lttng_ht *relayd_ht;
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449
450 /*
451 * This hash table contains all streams (metadata and data) indexed by
452 * session id. In other words, the ht is indexed by session id and each
453 * bucket contains the list of associated streams.
454 *
455 * This HT uses the "node_session_id" of the consumer stream.
456 */
457 struct lttng_ht *stream_list_ht;
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458
459 /*
460 * This HT uses the "node_channel_id" of the consumer stream.
461 */
462 struct lttng_ht *stream_per_chan_id_ht;
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463};
464
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465/*
466 * Init consumer data structures.
467 */
ffe60014 468void lttng_consumer_init(void);
e4421fec 469
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470/*
471 * Set the error socket for communication with a session daemon.
472 */
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473void lttng_consumer_set_error_sock(struct lttng_consumer_local_data *ctx,
474 int sock);
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475
476/*
477 * Set the command socket path for communication with a session daemon.
478 */
ffe60014 479void lttng_consumer_set_command_sock_path(
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480 struct lttng_consumer_local_data *ctx, char *sock);
481
482/*
483 * Send return code to session daemon.
484 *
485 * Returns the return code of sendmsg : the number of bytes transmitted or -1
486 * on error.
487 */
ffe60014 488int lttng_consumer_send_error(struct lttng_consumer_local_data *ctx, int cmd);
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489
490/*
491 * Called from signal handler to ensure a clean exit.
492 */
ffe60014 493void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx);
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494
495/*
496 * Cleanup the daemon's socket on exit.
497 */
ffe60014 498void lttng_consumer_cleanup(void);
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499
500/*
501 * Flush pending writes to trace output disk file.
502 */
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503void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream,
504 off_t orig_offset);
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505
506/*
507 * Poll on the should_quit pipe and the command socket return -1 on error and
508 * should exit, 0 if data is available on the command socket
509 */
ffe60014 510int lttng_consumer_poll_socket(struct pollfd *kconsumer_sockpoll);
3bd1e081 511
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512struct lttng_consumer_stream *consumer_allocate_stream(uint64_t channel_key,
513 uint64_t stream_key,
3bd1e081 514 enum lttng_consumer_stream_state state,
ffe60014 515 const char *channel_name,
6df2e2c9 516 uid_t uid,
00e2e675 517 gid_t gid,
57a269f2 518 uint64_t relayd_id,
53632229 519 uint64_t session_id,
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520 int cpu,
521 int *alloc_ret,
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522 enum consumer_channel_type type,
523 unsigned int monitor);
d88aee68 524struct lttng_consumer_channel *consumer_allocate_channel(uint64_t key,
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525 uint64_t session_id,
526 const char *pathname,
527 const char *name,
528 uid_t uid,
529 gid_t gid,
57a269f2 530 uint64_t relayd_id,
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531 enum lttng_event_output output,
532 uint64_t tracefile_size,
2bba9e53 533 uint64_t tracefile_count,
1950109e 534 uint64_t session_id_per_pid,
2bba9e53 535 unsigned int monitor);
ffe60014 536void consumer_del_stream(struct lttng_consumer_stream *stream,
e316aad5 537 struct lttng_ht *ht);
ffe60014 538void consumer_del_metadata_stream(struct lttng_consumer_stream *stream,
e316aad5 539 struct lttng_ht *ht);
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540int consumer_add_channel(struct lttng_consumer_channel *channel,
541 struct lttng_consumer_local_data *ctx);
ffe60014 542void consumer_del_channel(struct lttng_consumer_channel *channel);
3bd1e081 543
00e2e675 544/* lttng-relayd consumer command */
00e2e675 545struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair(
da009f2c 546 uint64_t net_seq_idx);
d88aee68 547struct consumer_relayd_sock_pair *consumer_find_relayd(uint64_t key);
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548int consumer_send_relayd_stream(struct lttng_consumer_stream *stream, char *path);
549void close_relayd_stream(struct lttng_consumer_stream *stream);
d88aee68 550struct lttng_consumer_channel *consumer_find_channel(uint64_t key);
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551int consumer_handle_stream_before_relayd(struct lttng_consumer_stream *stream,
552 size_t data_size);
c869f647 553void consumer_steal_stream_key(int key, struct lttng_ht *ht);
00e2e675 554
ffe60014 555struct lttng_consumer_local_data *lttng_consumer_create(
3bd1e081 556 enum lttng_consumer_type type,
4078b776 557 ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream,
d41f73b7 558 struct lttng_consumer_local_data *ctx),
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559 int (*recv_channel)(struct lttng_consumer_channel *channel),
560 int (*recv_stream)(struct lttng_consumer_stream *stream),
30319bcb 561 int (*update_stream)(uint64_t sessiond_key, uint32_t state));
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562void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx);
563ssize_t lttng_consumer_on_read_subbuffer_mmap(
3bd1e081 564 struct lttng_consumer_local_data *ctx,
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565 struct lttng_consumer_stream *stream, unsigned long len,
566 unsigned long padding);
ffe60014 567ssize_t lttng_consumer_on_read_subbuffer_splice(
3bd1e081 568 struct lttng_consumer_local_data *ctx,
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569 struct lttng_consumer_stream *stream, unsigned long len,
570 unsigned long padding);
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571int lttng_consumer_take_snapshot(struct lttng_consumer_stream *stream);
572int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream *stream,
3bd1e081 573 unsigned long *pos);
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574void *consumer_thread_metadata_poll(void *data);
575void *consumer_thread_data_poll(void *data);
576void *consumer_thread_sessiond_poll(void *data);
d8ef542d 577void *consumer_thread_channel_poll(void *data);
ffe60014 578int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx,
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579 int sock, struct pollfd *consumer_sockpoll);
580
4078b776 581ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream,
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582 struct lttng_consumer_local_data *ctx);
583int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream);
da009f2c 584int consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type,
7735ef9e 585 struct lttng_consumer_local_data *ctx, int sock,
6151a90f 586 struct pollfd *consumer_sockpoll, struct lttcomm_relayd_sock *relayd_sock,
30319bcb 587 uint64_t sessiond_id);
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588void consumer_flag_relayd_for_destroy(
589 struct consumer_relayd_sock_pair *relayd);
6d805429 590int consumer_data_pending(uint64_t id);
f50f23d9 591int consumer_send_status_msg(int sock, int ret_code);
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592int consumer_send_status_channel(int sock,
593 struct lttng_consumer_channel *channel);
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594void notify_thread_del_channel(struct lttng_consumer_local_data *ctx,
595 uint64_t key);
51230d70 596void consumer_destroy_relayd(struct consumer_relayd_sock_pair *relayd);
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597unsigned long consumer_get_consumed_maxsize(unsigned long consumed_pos,
598 unsigned long produced_pos, uint64_t max_stream_size);
d41f73b7 599
f02e1e8a 600#endif /* LIB_CONSUMER_H */
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