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3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
00e2e675 DG |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
4 | * 2012 - David Goulet <dgoulet@efficios.com> | |
3bd1e081 | 5 | * |
d14d33bf AM |
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 | * |
d14d33bf AM |
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 | * |
d14d33bf AM |
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. | |
3bd1e081 MD |
18 | */ |
19 | ||
f02e1e8a DG |
20 | #ifndef LIB_CONSUMER_H |
21 | #define LIB_CONSUMER_H | |
3bd1e081 MD |
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 | |
b9182dd9 DG |
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> |
50adc264 | 35 | #include <common/index/ctf-index.h> |
3bd1e081 | 36 | |
3bd1e081 MD |
37 | /* Commands for consumer */ |
38 | enum lttng_consumer_command { | |
39 | LTTNG_CONSUMER_ADD_CHANNEL, | |
40 | LTTNG_CONSUMER_ADD_STREAM, | |
41 | /* pause, delete, active depending on fd state */ | |
42 | LTTNG_CONSUMER_UPDATE_STREAM, | |
43 | /* inform the consumer to quit when all fd has hang up */ | |
84382d49 | 44 | LTTNG_CONSUMER_STOP, /* deprecated */ |
00e2e675 | 45 | LTTNG_CONSUMER_ADD_RELAYD_SOCKET, |
173af62f DG |
46 | /* Inform the consumer to kill a specific relayd connection */ |
47 | LTTNG_CONSUMER_DESTROY_RELAYD, | |
53632229 | 48 | /* Return to the sessiond if there is data pending for a session */ |
6d805429 | 49 | LTTNG_CONSUMER_DATA_PENDING, |
ffe60014 DG |
50 | /* Consumer creates a channel and returns it to sessiond. */ |
51 | LTTNG_CONSUMER_ASK_CHANNEL_CREATION, | |
52 | LTTNG_CONSUMER_GET_CHANNEL, | |
53 | LTTNG_CONSUMER_DESTROY_CHANNEL, | |
d88aee68 DG |
54 | LTTNG_CONSUMER_PUSH_METADATA, |
55 | LTTNG_CONSUMER_CLOSE_METADATA, | |
56 | LTTNG_CONSUMER_SETUP_METADATA, | |
7972aab2 | 57 | LTTNG_CONSUMER_FLUSH_CHANNEL, |
6dc3064a DG |
58 | LTTNG_CONSUMER_SNAPSHOT_CHANNEL, |
59 | LTTNG_CONSUMER_SNAPSHOT_METADATA, | |
a4baae1b | 60 | LTTNG_CONSUMER_STREAMS_SENT, |
fb83fe64 JD |
61 | LTTNG_CONSUMER_DISCARDED_EVENTS, |
62 | LTTNG_CONSUMER_LOST_PACKETS, | |
0dd01979 | 63 | LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL, |
3bd1e081 MD |
64 | }; |
65 | ||
66 | /* State of each fd in consumer */ | |
67 | enum lttng_consumer_stream_state { | |
68 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
69 | LTTNG_CONSUMER_PAUSE_STREAM, | |
70 | LTTNG_CONSUMER_DELETE_STREAM, | |
71 | }; | |
72 | ||
3bd1e081 MD |
73 | enum lttng_consumer_type { |
74 | LTTNG_CONSUMER_UNKNOWN = 0, | |
75 | LTTNG_CONSUMER_KERNEL, | |
7753dea8 MD |
76 | LTTNG_CONSUMER64_UST, |
77 | LTTNG_CONSUMER32_UST, | |
3bd1e081 MD |
78 | }; |
79 | ||
8994307f DG |
80 | enum consumer_endpoint_status { |
81 | CONSUMER_ENDPOINT_ACTIVE, | |
82 | CONSUMER_ENDPOINT_INACTIVE, | |
83 | }; | |
84 | ||
ffe60014 DG |
85 | enum consumer_channel_output { |
86 | CONSUMER_CHANNEL_MMAP = 0, | |
87 | CONSUMER_CHANNEL_SPLICE = 1, | |
88 | }; | |
89 | ||
90 | enum consumer_channel_type { | |
91 | CONSUMER_CHANNEL_TYPE_METADATA = 0, | |
d88aee68 | 92 | CONSUMER_CHANNEL_TYPE_DATA = 1, |
ffe60014 DG |
93 | }; |
94 | ||
51230d70 DG |
95 | extern struct lttng_consumer_global_data consumer_data; |
96 | ||
ffe60014 DG |
97 | struct stream_list { |
98 | struct cds_list_head head; | |
99 | unsigned int count; | |
100 | }; | |
101 | ||
331744e3 JD |
102 | /* Stub. */ |
103 | struct consumer_metadata_cache; | |
104 | ||
3bd1e081 | 105 | struct lttng_consumer_channel { |
ffe60014 | 106 | /* HT node used for consumer_data.channel_ht */ |
d88aee68 | 107 | struct lttng_ht_node_u64 node; |
ffe60014 | 108 | /* Indexed key. Incremented value in the consumer. */ |
d88aee68 | 109 | uint64_t key; |
ffe60014 DG |
110 | /* Number of streams referencing this channel */ |
111 | int refcount; | |
112 | /* Tracing session id on the session daemon side. */ | |
113 | uint64_t session_id; | |
1950109e JD |
114 | /* |
115 | * Session id when requesting metadata to the session daemon for | |
116 | * a session with per-PID buffers. | |
117 | */ | |
118 | uint64_t session_id_per_pid; | |
ffe60014 DG |
119 | /* Channel trace file path name. */ |
120 | char pathname[PATH_MAX]; | |
121 | /* Channel name. */ | |
122 | char name[LTTNG_SYMBOL_NAME_LEN]; | |
567eb353 | 123 | /* UID and GID of the session owning this channel. */ |
ffe60014 DG |
124 | uid_t uid; |
125 | gid_t gid; | |
da009f2c MD |
126 | /* Relayd id of the channel. -1ULL if it does not apply. */ |
127 | uint64_t relayd_id; | |
c30aaa51 | 128 | /* |
ffe60014 DG |
129 | * Number of streams NOT initialized yet. This is used in order to not |
130 | * delete this channel if streams are getting initialized. | |
c30aaa51 | 131 | */ |
ffe60014 DG |
132 | unsigned int nb_init_stream_left; |
133 | /* Output type (mmap or splice). */ | |
134 | enum consumer_channel_output output; | |
135 | /* Channel type for stream */ | |
136 | enum consumer_channel_type type; | |
c30aaa51 | 137 | |
3bd1e081 | 138 | /* For UST */ |
567eb353 | 139 | uid_t ust_app_uid; /* Application UID. */ |
ffe60014 DG |
140 | struct ustctl_consumer_channel *uchan; |
141 | unsigned char uuid[UUID_STR_LEN]; | |
142 | /* | |
143 | * Temporary stream list used to store the streams once created and waiting | |
144 | * to be sent to the session daemon by receiving the | |
145 | * LTTNG_CONSUMER_GET_CHANNEL. | |
146 | */ | |
147 | struct stream_list streams; | |
07b86b52 | 148 | |
d88aee68 DG |
149 | /* |
150 | * Set if the channel is metadata. We keep a reference to the stream | |
151 | * because we have to flush data once pushed by the session daemon. For a | |
152 | * regular channel, this is always set to NULL. | |
153 | */ | |
154 | struct lttng_consumer_stream *metadata_stream; | |
d8ef542d MD |
155 | |
156 | /* for UST */ | |
157 | int wait_fd; | |
158 | /* Node within channel thread ht */ | |
159 | struct lttng_ht_node_u64 wait_fd_node; | |
331744e3 JD |
160 | |
161 | /* Metadata cache is metadata channel */ | |
162 | struct consumer_metadata_cache *metadata_cache; | |
d3e2ba59 | 163 | /* For UST metadata periodical flush */ |
331744e3 JD |
164 | int switch_timer_enabled; |
165 | timer_t switch_timer; | |
4419b4fb MD |
166 | int switch_timer_error; |
167 | ||
d3e2ba59 JD |
168 | /* For the live mode */ |
169 | int live_timer_enabled; | |
170 | timer_t live_timer; | |
171 | int live_timer_error; | |
172 | ||
1624d5b7 JD |
173 | /* On-disk circular buffer */ |
174 | uint64_t tracefile_size; | |
175 | uint64_t tracefile_count; | |
2bba9e53 DG |
176 | /* |
177 | * Monitor or not the streams of this channel meaning this indicates if the | |
178 | * streams should be sent to the data/metadata thread or added to the no | |
179 | * monitor list of the channel. | |
180 | */ | |
181 | unsigned int monitor; | |
a9838785 MD |
182 | |
183 | /* | |
184 | * Channel lock. | |
185 | * | |
ec6ea7d0 MD |
186 | * This lock protects against concurrent update of channel. |
187 | * | |
a9838785 | 188 | * This is nested INSIDE the consumer data lock. |
ec6ea7d0 | 189 | * This is nested OUTSIDE the channel timer lock. |
a9838785 MD |
190 | * This is nested OUTSIDE the metadata cache lock. |
191 | * This is nested OUTSIDE stream lock. | |
192 | * This is nested OUTSIDE consumer_relayd_sock_pair lock. | |
193 | */ | |
194 | pthread_mutex_t lock; | |
ec6ea7d0 MD |
195 | |
196 | /* | |
197 | * Channel teardown lock. | |
198 | * | |
199 | * This lock protect against teardown of channel. It is _never_ | |
200 | * taken by the timer handler. | |
201 | * | |
202 | * This is nested INSIDE the consumer data lock. | |
203 | * This is nested INSIDE the channel lock. | |
204 | * This is nested OUTSIDE the metadata cache lock. | |
205 | * This is nested OUTSIDE stream lock. | |
206 | * This is nested OUTSIDE consumer_relayd_sock_pair lock. | |
207 | */ | |
208 | pthread_mutex_t timer_lock; | |
ecc48a90 JD |
209 | |
210 | /* Timer value in usec for live streaming. */ | |
211 | unsigned int live_timer_interval; | |
d7ba1388 | 212 | |
4628484a MD |
213 | int *stream_fds; |
214 | int nr_stream_fds; | |
3d071855 | 215 | char root_shm_path[PATH_MAX]; |
d7ba1388 | 216 | char shm_path[PATH_MAX]; |
fb83fe64 JD |
217 | /* Total number of discarded events for that channel. */ |
218 | uint64_t discarded_events; | |
219 | /* Total number of missed packets due to overwriting (overwrite). */ | |
220 | uint64_t lost_packets; | |
3bd1e081 MD |
221 | }; |
222 | ||
3bd1e081 MD |
223 | /* |
224 | * Internal representation of the streams, sessiond_key is used to identify | |
225 | * uniquely a stream. | |
226 | */ | |
227 | struct lttng_consumer_stream { | |
53632229 | 228 | /* HT node used by the data_ht and metadata_ht */ |
d88aee68 | 229 | struct lttng_ht_node_u64 node; |
d8ef542d MD |
230 | /* stream indexed per channel key node */ |
231 | struct lttng_ht_node_u64 node_channel_id; | |
53632229 | 232 | /* HT node used in consumer_data.stream_list_ht */ |
d88aee68 | 233 | struct lttng_ht_node_u64 node_session_id; |
ffe60014 DG |
234 | /* Pointer to associated channel. */ |
235 | struct lttng_consumer_channel *chan; | |
236 | ||
237 | /* Key by which the stream is indexed for 'node'. */ | |
d88aee68 | 238 | uint64_t key; |
3bd1e081 | 239 | /* |
ffe60014 DG |
240 | * File descriptor of the data output file. This can be either a file or a |
241 | * socket fd for relayd streaming. | |
3bd1e081 | 242 | */ |
3bd1e081 | 243 | int out_fd; /* output file to write the data */ |
ffe60014 DG |
244 | /* Write position in the output file descriptor */ |
245 | off_t out_fd_offset; | |
e5d1a9b3 MD |
246 | /* Amount of bytes written to the output */ |
247 | uint64_t output_written; | |
3bd1e081 | 248 | enum lttng_consumer_stream_state state; |
b5c5fc29 | 249 | int shm_fd_is_copy; |
4078b776 | 250 | int data_read; |
d056b477 | 251 | int hangup_flush_done; |
c585821b | 252 | |
0dd01979 MD |
253 | /* |
254 | * Whether the stream is in a "complete" state (e.g. it does not have a | |
255 | * partially written sub-buffer. | |
256 | * | |
257 | * Initialized to "false" on stream creation (first packet is empty). | |
258 | * | |
259 | * The various transitions of the quiescent state are: | |
260 | * - On "start" tracing: set to false, since the stream is not | |
261 | * "complete". | |
262 | * - On "stop" tracing: if !quiescent -> flush FINAL (update | |
263 | * timestamp_end), and set to true; the stream has entered a | |
264 | * complete/quiescent state. | |
265 | * - On "destroy" or stream/application hang-up: if !quiescent -> | |
266 | * flush FINAL, and set to true. | |
267 | * | |
268 | * NOTE: Update and read are protected by the stream lock. | |
269 | */ | |
270 | bool quiescent; | |
271 | ||
c585821b MD |
272 | /* |
273 | * metadata_timer_lock protects flags waiting_on_metadata and | |
274 | * missed_metadata_flush. | |
275 | */ | |
276 | pthread_mutex_t metadata_timer_lock; | |
277 | /* | |
278 | * Flag set when awaiting metadata to be pushed. Used in the | |
279 | * timer thread to skip waiting on the stream (and stream lock) to | |
280 | * ensure we can proceed to flushing metadata in live mode. | |
281 | */ | |
282 | bool waiting_on_metadata; | |
283 | /* Raised when a timer misses a metadata flush. */ | |
284 | bool missed_metadata_flush; | |
285 | ||
ffe60014 DG |
286 | enum lttng_event_output output; |
287 | /* Maximum subbuffer size. */ | |
288 | unsigned long max_sb_size; | |
289 | ||
290 | /* | |
291 | * Still used by the kernel for MMAP output. For UST, the ustctl getter is | |
292 | * used for the mmap base and offset. | |
293 | */ | |
294 | void *mmap_base; | |
295 | unsigned long mmap_len; | |
296 | ||
297 | /* For UST */ | |
298 | ||
299 | int wait_fd; | |
6df2e2c9 MD |
300 | /* UID/GID of the user owning the session to which stream belongs */ |
301 | uid_t uid; | |
302 | gid_t gid; | |
00e2e675 | 303 | /* Network sequence number. Indicating on which relayd socket it goes. */ |
d88aee68 | 304 | uint64_t net_seq_idx; |
d01178b6 DG |
305 | /* |
306 | * Indicate if this stream was successfully sent to a relayd. This is set | |
307 | * after the refcount of the relayd is incremented and is checked when the | |
308 | * stream is closed before decrementing the refcount in order to avoid an | |
309 | * unbalanced state. | |
310 | */ | |
311 | unsigned int sent_to_relayd; | |
312 | ||
00e2e675 DG |
313 | /* Identify if the stream is the metadata */ |
314 | unsigned int metadata_flag; | |
93ec662e JD |
315 | /* |
316 | * Last known metadata version, reset the metadata file in case | |
317 | * of change. | |
318 | */ | |
319 | uint64_t metadata_version; | |
00e2e675 DG |
320 | /* Used when the stream is set for network streaming */ |
321 | uint64_t relayd_stream_id; | |
3604f373 DG |
322 | /* |
323 | * When sending a stream packet to a relayd, this number is used to track | |
324 | * the packet sent by the consumer and seen by the relayd. When sending the | |
325 | * data header to the relayd, this number is sent and if the transmission | |
326 | * was successful, it is incremented. | |
327 | * | |
328 | * Even if the full data is not fully transmitted it won't matter since | |
329 | * only two possible error can happen after that where either the relayd | |
330 | * died or a read error is detected on the stream making this value useless | |
331 | * after that. | |
332 | * | |
333 | * This value SHOULD be read/updated atomically or with the lock acquired. | |
334 | */ | |
173af62f | 335 | uint64_t next_net_seq_num; |
63281d5d | 336 | /* |
74251bb8 DG |
337 | * Lock to use the stream FDs since they are used between threads. |
338 | * | |
339 | * This is nested INSIDE the consumer_data lock. | |
73811ecc | 340 | * This is nested INSIDE the metadata cache lock. |
a9838785 | 341 | * This is nested INSIDE the channel lock. |
ec6ea7d0 | 342 | * This is nested INSIDE the channel timer lock. |
74251bb8 | 343 | * This is nested OUTSIDE consumer_relayd_sock_pair lock. |
63281d5d | 344 | */ |
53632229 DG |
345 | pthread_mutex_t lock; |
346 | /* Tracing session id */ | |
347 | uint64_t session_id; | |
8994307f DG |
348 | /* |
349 | * Indicates if the stream end point is still active or not (network | |
350 | * streaming or local file system). The thread "owning" the stream is | |
351 | * handling this status and can be notified of a state change through the | |
352 | * consumer data appropriate pipe. | |
353 | */ | |
354 | enum consumer_endpoint_status endpoint_status; | |
ffe60014 DG |
355 | /* Stream name. Format is: <channel_name>_<cpu_number> */ |
356 | char name[LTTNG_SYMBOL_NAME_LEN]; | |
357 | /* Internal state of libustctl. */ | |
358 | struct ustctl_consumer_stream *ustream; | |
359 | struct cds_list_head send_node; | |
1624d5b7 JD |
360 | /* On-disk circular buffer */ |
361 | uint64_t tracefile_size_current; | |
362 | uint64_t tracefile_count_current; | |
4891ece8 DG |
363 | /* |
364 | * Monitor or not the streams of this channel meaning this indicates if the | |
365 | * streams should be sent to the data/metadata thread or added to the no | |
366 | * monitor list of the channel. | |
367 | */ | |
368 | unsigned int monitor; | |
369 | /* | |
370 | * Indicate if the stream is globally visible meaning that it has been | |
371 | * added to the multiple hash tables. If *not* set, NO lock should be | |
372 | * acquired in the destroy path. | |
373 | */ | |
374 | unsigned int globally_visible; | |
feb78e88 MD |
375 | /* |
376 | * Pipe to wake up the metadata poll thread when the UST metadata | |
377 | * cache is updated. | |
378 | */ | |
379 | int ust_metadata_poll_pipe[2]; | |
380 | /* | |
381 | * How much metadata was read from the metadata cache and sent | |
382 | * to the channel. | |
383 | */ | |
384 | uint64_t ust_metadata_pushed; | |
fb83fe64 JD |
385 | /* |
386 | * Copy of the last discarded event value to detect the overflow of | |
387 | * the counter. | |
388 | */ | |
389 | uint64_t last_discarded_events; | |
390 | /* Copy of the sequence number of the last packet extracted. */ | |
391 | uint64_t last_sequence_number; | |
309167d2 JD |
392 | /* |
393 | * FD of the index file for this stream. | |
394 | */ | |
395 | int index_fd; | |
94d49140 | 396 | |
a2361a61 JD |
397 | /* |
398 | * Local pipe to extract data when using splice. | |
399 | */ | |
400 | int splice_pipe[2]; | |
401 | ||
94d49140 JD |
402 | /* |
403 | * Rendez-vous point between data and metadata stream in live mode. | |
404 | */ | |
405 | pthread_cond_t metadata_rdv; | |
406 | pthread_mutex_t metadata_rdv_lock; | |
02b3d176 DG |
407 | |
408 | /* Indicate if the stream still has some data to be read. */ | |
409 | unsigned int has_data:1; | |
93ec662e JD |
410 | /* |
411 | * Inform the consumer or relay to reset the metadata | |
412 | * file before writing in it (regeneration). | |
413 | */ | |
414 | unsigned int reset_metadata_flag:1; | |
00e2e675 DG |
415 | }; |
416 | ||
417 | /* | |
418 | * Internal representation of a relayd socket pair. | |
419 | */ | |
420 | struct consumer_relayd_sock_pair { | |
421 | /* Network sequence number. */ | |
da009f2c | 422 | uint64_t net_seq_idx; |
00e2e675 DG |
423 | /* Number of stream associated with this relayd */ |
424 | unsigned int refcount; | |
173af62f DG |
425 | |
426 | /* | |
427 | * This flag indicates whether or not we should destroy this object. The | |
428 | * destruction should ONLY occurs when this flag is set and the refcount is | |
429 | * set to zero. | |
430 | */ | |
431 | unsigned int destroy_flag; | |
432 | ||
51d7db73 DG |
433 | /* |
434 | * Mutex protecting the control socket to avoid out of order packets | |
435 | * between threads sending data to the relayd. Since metadata data is sent | |
436 | * over that socket, at least two sendmsg() are needed (header + data) | |
437 | * creating a race for packets to overlap between threads using it. | |
74251bb8 DG |
438 | * |
439 | * This is nested INSIDE the consumer_data lock. | |
440 | * This is nested INSIDE the stream lock. | |
51d7db73 | 441 | */ |
00e2e675 | 442 | pthread_mutex_t ctrl_sock_mutex; |
51d7db73 DG |
443 | |
444 | /* Control socket. Command and metadata are passed over it */ | |
6151a90f | 445 | struct lttcomm_relayd_sock control_sock; |
51d7db73 DG |
446 | |
447 | /* | |
448 | * We don't need a mutex at this point since we only splice or write single | |
449 | * large chunk of data with a header appended at the begining. Moreover, | |
450 | * this socket is for now only used in a single thread. | |
451 | */ | |
6151a90f | 452 | struct lttcomm_relayd_sock data_sock; |
d88aee68 | 453 | struct lttng_ht_node_u64 node; |
c5b6f4f0 | 454 | |
f7079f67 DG |
455 | /* Session id on both sides for the sockets. */ |
456 | uint64_t relayd_session_id; | |
457 | uint64_t sessiond_session_id; | |
3bd1e081 MD |
458 | }; |
459 | ||
460 | /* | |
461 | * UST consumer local data to the program. One or more instance per | |
462 | * process. | |
463 | */ | |
464 | struct lttng_consumer_local_data { | |
4078b776 MD |
465 | /* |
466 | * Function to call when data is available on a buffer. | |
467 | * Returns the number of bytes read, or negative error value. | |
468 | */ | |
469 | ssize_t (*on_buffer_ready)(struct lttng_consumer_stream *stream, | |
d41f73b7 | 470 | struct lttng_consumer_local_data *ctx); |
3bd1e081 MD |
471 | /* |
472 | * function to call when we receive a new channel, it receives a | |
473 | * newly allocated channel, depending on the return code of this | |
474 | * function, the new channel will be handled by the application | |
475 | * or the library. | |
476 | * | |
477 | * Returns: | |
478 | * > 0 (success, FD is kept by application) | |
479 | * == 0 (success, FD is left to library) | |
480 | * < 0 (error) | |
481 | */ | |
482 | int (*on_recv_channel)(struct lttng_consumer_channel *channel); | |
483 | /* | |
484 | * function to call when we receive a new stream, it receives a | |
485 | * newly allocated stream, depending on the return code of this | |
486 | * function, the new stream will be handled by the application | |
487 | * or the library. | |
488 | * | |
489 | * Returns: | |
490 | * > 0 (success, FD is kept by application) | |
491 | * == 0 (success, FD is left to library) | |
492 | * < 0 (error) | |
493 | */ | |
494 | int (*on_recv_stream)(struct lttng_consumer_stream *stream); | |
495 | /* | |
496 | * function to call when a stream is getting updated by the session | |
497 | * daemon, this function receives the sessiond key and the new | |
498 | * state, depending on the return code of this function the | |
499 | * update of state for the stream is handled by the application | |
500 | * or the library. | |
501 | * | |
502 | * Returns: | |
503 | * > 0 (success, FD is kept by application) | |
504 | * == 0 (success, FD is left to library) | |
505 | * < 0 (error) | |
506 | */ | |
30319bcb | 507 | int (*on_update_stream)(uint64_t sessiond_key, uint32_t state); |
331744e3 | 508 | enum lttng_consumer_type type; |
3bd1e081 MD |
509 | /* socket to communicate errors with sessiond */ |
510 | int consumer_error_socket; | |
75d83e50 | 511 | /* socket to ask metadata to sessiond. */ |
331744e3 | 512 | int consumer_metadata_socket; |
ace17efa MD |
513 | /* |
514 | * Protect consumer_metadata_socket. | |
515 | * | |
516 | * This is nested OUTSIDE the metadata cache lock. | |
517 | */ | |
75d83e50 | 518 | pthread_mutex_t metadata_socket_lock; |
3bd1e081 MD |
519 | /* socket to exchange commands with sessiond */ |
520 | char *consumer_command_sock_path; | |
521 | /* communication with splice */ | |
d8ef542d | 522 | int consumer_channel_pipe[2]; |
50f8ae69 | 523 | /* Data stream poll thread pipe. To transfer data stream to the thread */ |
acdb9057 | 524 | struct lttng_pipe *consumer_data_pipe; |
02b3d176 DG |
525 | |
526 | /* | |
527 | * Data thread use that pipe to catch wakeup from read subbuffer that | |
528 | * detects that there is still data to be read for the stream encountered. | |
529 | * Before doing so, the stream is flagged to indicate that there is still | |
530 | * data to be read. | |
531 | * | |
532 | * Both pipes (read/write) are owned and used inside the data thread. | |
533 | */ | |
534 | struct lttng_pipe *consumer_wakeup_pipe; | |
535 | /* Indicate if the wakeup thread has been notified. */ | |
536 | unsigned int has_wakeup:1; | |
537 | ||
3bd1e081 MD |
538 | /* to let the signal handler wake up the fd receiver thread */ |
539 | int consumer_should_quit[2]; | |
fb3a43a9 | 540 | /* Metadata poll thread pipe. Transfer metadata stream to it */ |
13886d2d | 541 | struct lttng_pipe *consumer_metadata_pipe; |
3bd1e081 MD |
542 | }; |
543 | ||
544 | /* | |
545 | * Library-level data. One instance per process. | |
546 | */ | |
547 | struct lttng_consumer_global_data { | |
548 | /* | |
e4421fec DG |
549 | * At this time, this lock is used to ensure coherence between the count |
550 | * and number of element in the hash table. It's also a protection for | |
6065ceec DG |
551 | * concurrent read/write between threads. |
552 | * | |
74251bb8 DG |
553 | * This is nested OUTSIDE the stream lock. |
554 | * This is nested OUTSIDE the consumer_relayd_sock_pair lock. | |
3bd1e081 MD |
555 | */ |
556 | pthread_mutex_t lock; | |
e4421fec | 557 | |
3bd1e081 | 558 | /* |
3cc2f24a DG |
559 | * Number of streams in the data stream hash table declared outside. |
560 | * Protected by consumer_data.lock. | |
3bd1e081 MD |
561 | */ |
562 | int stream_count; | |
3cc2f24a DG |
563 | |
564 | /* Channel hash table protected by consumer_data.lock. */ | |
e4421fec | 565 | struct lttng_ht *channel_ht; |
3bd1e081 MD |
566 | /* |
567 | * Flag specifying if the local array of FDs needs update in the | |
568 | * poll function. Protected by consumer_data.lock. | |
569 | */ | |
570 | unsigned int need_update; | |
571 | enum lttng_consumer_type type; | |
00e2e675 DG |
572 | |
573 | /* | |
574 | * Relayd socket(s) hashtable indexed by network sequence number. Each | |
575 | * stream has an index which associate the right relayd socket to use. | |
576 | */ | |
577 | struct lttng_ht *relayd_ht; | |
53632229 DG |
578 | |
579 | /* | |
580 | * This hash table contains all streams (metadata and data) indexed by | |
581 | * session id. In other words, the ht is indexed by session id and each | |
582 | * bucket contains the list of associated streams. | |
583 | * | |
584 | * This HT uses the "node_session_id" of the consumer stream. | |
585 | */ | |
586 | struct lttng_ht *stream_list_ht; | |
d8ef542d MD |
587 | |
588 | /* | |
589 | * This HT uses the "node_channel_id" of the consumer stream. | |
590 | */ | |
591 | struct lttng_ht *stream_per_chan_id_ht; | |
3bd1e081 MD |
592 | }; |
593 | ||
e4421fec DG |
594 | /* |
595 | * Init consumer data structures. | |
596 | */ | |
282dadbc | 597 | int lttng_consumer_init(void); |
e4421fec | 598 | |
3bd1e081 MD |
599 | /* |
600 | * Set the error socket for communication with a session daemon. | |
601 | */ | |
ffe60014 DG |
602 | void lttng_consumer_set_error_sock(struct lttng_consumer_local_data *ctx, |
603 | int sock); | |
3bd1e081 MD |
604 | |
605 | /* | |
606 | * Set the command socket path for communication with a session daemon. | |
607 | */ | |
ffe60014 | 608 | void lttng_consumer_set_command_sock_path( |
3bd1e081 MD |
609 | struct lttng_consumer_local_data *ctx, char *sock); |
610 | ||
611 | /* | |
612 | * Send return code to session daemon. | |
613 | * | |
614 | * Returns the return code of sendmsg : the number of bytes transmitted or -1 | |
615 | * on error. | |
616 | */ | |
ffe60014 | 617 | int lttng_consumer_send_error(struct lttng_consumer_local_data *ctx, int cmd); |
3bd1e081 MD |
618 | |
619 | /* | |
620 | * Called from signal handler to ensure a clean exit. | |
621 | */ | |
ffe60014 | 622 | void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx); |
3bd1e081 MD |
623 | |
624 | /* | |
625 | * Cleanup the daemon's socket on exit. | |
626 | */ | |
ffe60014 | 627 | void lttng_consumer_cleanup(void); |
3bd1e081 | 628 | |
3bd1e081 MD |
629 | /* |
630 | * Poll on the should_quit pipe and the command socket return -1 on error and | |
631 | * should exit, 0 if data is available on the command socket | |
632 | */ | |
ffe60014 | 633 | int lttng_consumer_poll_socket(struct pollfd *kconsumer_sockpoll); |
3bd1e081 | 634 | |
d88aee68 DG |
635 | struct lttng_consumer_stream *consumer_allocate_stream(uint64_t channel_key, |
636 | uint64_t stream_key, | |
3bd1e081 | 637 | enum lttng_consumer_stream_state state, |
ffe60014 | 638 | const char *channel_name, |
6df2e2c9 | 639 | uid_t uid, |
00e2e675 | 640 | gid_t gid, |
57a269f2 | 641 | uint64_t relayd_id, |
53632229 | 642 | uint64_t session_id, |
ffe60014 DG |
643 | int cpu, |
644 | int *alloc_ret, | |
4891ece8 DG |
645 | enum consumer_channel_type type, |
646 | unsigned int monitor); | |
d88aee68 | 647 | struct lttng_consumer_channel *consumer_allocate_channel(uint64_t key, |
ffe60014 DG |
648 | uint64_t session_id, |
649 | const char *pathname, | |
650 | const char *name, | |
651 | uid_t uid, | |
652 | gid_t gid, | |
57a269f2 | 653 | uint64_t relayd_id, |
1624d5b7 JD |
654 | enum lttng_event_output output, |
655 | uint64_t tracefile_size, | |
2bba9e53 | 656 | uint64_t tracefile_count, |
1950109e | 657 | uint64_t session_id_per_pid, |
ecc48a90 | 658 | unsigned int monitor, |
d7ba1388 | 659 | unsigned int live_timer_interval, |
3d071855 | 660 | const char *root_shm_path, |
d7ba1388 | 661 | const char *shm_path); |
ffe60014 | 662 | void consumer_del_stream(struct lttng_consumer_stream *stream, |
e316aad5 | 663 | struct lttng_ht *ht); |
ffe60014 | 664 | void consumer_del_metadata_stream(struct lttng_consumer_stream *stream, |
e316aad5 | 665 | struct lttng_ht *ht); |
d8ef542d MD |
666 | int consumer_add_channel(struct lttng_consumer_channel *channel, |
667 | struct lttng_consumer_local_data *ctx); | |
ffe60014 | 668 | void consumer_del_channel(struct lttng_consumer_channel *channel); |
3bd1e081 | 669 | |
00e2e675 | 670 | /* lttng-relayd consumer command */ |
d88aee68 | 671 | struct consumer_relayd_sock_pair *consumer_find_relayd(uint64_t key); |
10a50311 | 672 | int consumer_send_relayd_stream(struct lttng_consumer_stream *stream, char *path); |
a4baae1b | 673 | int consumer_send_relayd_streams_sent(uint64_t net_seq_idx); |
10a50311 | 674 | void close_relayd_stream(struct lttng_consumer_stream *stream); |
d88aee68 | 675 | struct lttng_consumer_channel *consumer_find_channel(uint64_t key); |
00e2e675 DG |
676 | int consumer_handle_stream_before_relayd(struct lttng_consumer_stream *stream, |
677 | size_t data_size); | |
c869f647 | 678 | void consumer_steal_stream_key(int key, struct lttng_ht *ht); |
00e2e675 | 679 | |
ffe60014 | 680 | struct lttng_consumer_local_data *lttng_consumer_create( |
3bd1e081 | 681 | enum lttng_consumer_type type, |
4078b776 | 682 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
d41f73b7 | 683 | struct lttng_consumer_local_data *ctx), |
3bd1e081 MD |
684 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
685 | int (*recv_stream)(struct lttng_consumer_stream *stream), | |
30319bcb | 686 | int (*update_stream)(uint64_t sessiond_key, uint32_t state)); |
ffe60014 DG |
687 | void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx); |
688 | ssize_t lttng_consumer_on_read_subbuffer_mmap( | |
3bd1e081 | 689 | struct lttng_consumer_local_data *ctx, |
1d4dfdef | 690 | struct lttng_consumer_stream *stream, unsigned long len, |
309167d2 | 691 | unsigned long padding, |
50adc264 | 692 | struct ctf_packet_index *index); |
ffe60014 | 693 | ssize_t lttng_consumer_on_read_subbuffer_splice( |
3bd1e081 | 694 | struct lttng_consumer_local_data *ctx, |
1d4dfdef | 695 | struct lttng_consumer_stream *stream, unsigned long len, |
309167d2 | 696 | unsigned long padding, |
50adc264 | 697 | struct ctf_packet_index *index); |
ffe60014 DG |
698 | int lttng_consumer_take_snapshot(struct lttng_consumer_stream *stream); |
699 | int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream *stream, | |
3bd1e081 | 700 | unsigned long *pos); |
6d574024 DG |
701 | int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream); |
702 | int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream); | |
ffe60014 DG |
703 | void *consumer_thread_metadata_poll(void *data); |
704 | void *consumer_thread_data_poll(void *data); | |
705 | void *consumer_thread_sessiond_poll(void *data); | |
d8ef542d | 706 | void *consumer_thread_channel_poll(void *data); |
ffe60014 | 707 | int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
3bd1e081 MD |
708 | int sock, struct pollfd *consumer_sockpoll); |
709 | ||
4078b776 | 710 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
711 | struct lttng_consumer_local_data *ctx); |
712 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream); | |
da009f2c | 713 | int consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type, |
7735ef9e | 714 | struct lttng_consumer_local_data *ctx, int sock, |
6151a90f | 715 | struct pollfd *consumer_sockpoll, struct lttcomm_relayd_sock *relayd_sock, |
d3e2ba59 | 716 | uint64_t sessiond_id, uint64_t relayd_session_id); |
a6ba4fe1 DG |
717 | void consumer_flag_relayd_for_destroy( |
718 | struct consumer_relayd_sock_pair *relayd); | |
6d805429 | 719 | int consumer_data_pending(uint64_t id); |
f50f23d9 | 720 | int consumer_send_status_msg(int sock, int ret_code); |
ffe60014 DG |
721 | int consumer_send_status_channel(int sock, |
722 | struct lttng_consumer_channel *channel); | |
a0cbdd2e MD |
723 | void notify_thread_del_channel(struct lttng_consumer_local_data *ctx, |
724 | uint64_t key); | |
51230d70 | 725 | void consumer_destroy_relayd(struct consumer_relayd_sock_pair *relayd); |
d07ceecd MD |
726 | unsigned long consumer_get_consume_start_pos(unsigned long consumed_pos, |
727 | unsigned long produced_pos, uint64_t nb_packets_per_stream, | |
728 | uint64_t max_sb_size); | |
5ab66908 MD |
729 | int consumer_add_data_stream(struct lttng_consumer_stream *stream); |
730 | void consumer_del_stream_for_data(struct lttng_consumer_stream *stream); | |
731 | int consumer_add_metadata_stream(struct lttng_consumer_stream *stream); | |
732 | void consumer_del_stream_for_metadata(struct lttng_consumer_stream *stream); | |
309167d2 | 733 | int consumer_create_index_file(struct lttng_consumer_stream *stream); |
d41f73b7 | 734 | |
f02e1e8a | 735 | #endif /* LIB_CONSUMER_H */ |