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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> | |
92816cc3 | 5 | * 2018 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
3bd1e081 | 6 | * |
d14d33bf AM |
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. | |
3bd1e081 | 10 | * |
d14d33bf AM |
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 | |
14 | * more details. | |
3bd1e081 | 15 | * |
d14d33bf AM |
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. | |
3bd1e081 MD |
19 | */ |
20 | ||
f02e1e8a DG |
21 | #ifndef LIB_CONSUMER_H |
22 | #define LIB_CONSUMER_H | |
3bd1e081 MD |
23 | |
24 | #include <limits.h> | |
25 | #include <poll.h> | |
6df2e2c9 | 26 | #include <unistd.h> |
ffe60014 | 27 | #include <urcu/list.h> |
e4421fec | 28 | |
3bd1e081 | 29 | #include <lttng/lttng.h> |
10a8a223 | 30 | |
b9182dd9 DG |
31 | #include <common/hashtable/hashtable.h> |
32 | #include <common/compat/fcntl.h> | |
ffe60014 | 33 | #include <common/compat/uuid.h> |
00e2e675 | 34 | #include <common/sessiond-comm/sessiond-comm.h> |
acdb9057 | 35 | #include <common/pipe.h> |
50adc264 | 36 | #include <common/index/ctf-index.h> |
28cc88f3 | 37 | #include <common/trace-chunk-registry.h> |
3bd1e081 | 38 | |
3bd1e081 MD |
39 | /* Commands for consumer */ |
40 | enum lttng_consumer_command { | |
41 | LTTNG_CONSUMER_ADD_CHANNEL, | |
42 | LTTNG_CONSUMER_ADD_STREAM, | |
43 | /* pause, delete, active depending on fd state */ | |
44 | LTTNG_CONSUMER_UPDATE_STREAM, | |
45 | /* inform the consumer to quit when all fd has hang up */ | |
84382d49 | 46 | LTTNG_CONSUMER_STOP, /* deprecated */ |
00e2e675 | 47 | LTTNG_CONSUMER_ADD_RELAYD_SOCKET, |
173af62f DG |
48 | /* Inform the consumer to kill a specific relayd connection */ |
49 | LTTNG_CONSUMER_DESTROY_RELAYD, | |
53632229 | 50 | /* Return to the sessiond if there is data pending for a session */ |
6d805429 | 51 | LTTNG_CONSUMER_DATA_PENDING, |
ffe60014 DG |
52 | /* Consumer creates a channel and returns it to sessiond. */ |
53 | LTTNG_CONSUMER_ASK_CHANNEL_CREATION, | |
54 | LTTNG_CONSUMER_GET_CHANNEL, | |
55 | LTTNG_CONSUMER_DESTROY_CHANNEL, | |
d88aee68 DG |
56 | LTTNG_CONSUMER_PUSH_METADATA, |
57 | LTTNG_CONSUMER_CLOSE_METADATA, | |
58 | LTTNG_CONSUMER_SETUP_METADATA, | |
7972aab2 | 59 | LTTNG_CONSUMER_FLUSH_CHANNEL, |
6dc3064a DG |
60 | LTTNG_CONSUMER_SNAPSHOT_CHANNEL, |
61 | LTTNG_CONSUMER_SNAPSHOT_METADATA, | |
a4baae1b | 62 | LTTNG_CONSUMER_STREAMS_SENT, |
fb83fe64 JD |
63 | LTTNG_CONSUMER_DISCARDED_EVENTS, |
64 | LTTNG_CONSUMER_LOST_PACKETS, | |
0dd01979 | 65 | LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL, |
b3530820 | 66 | LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE, |
b99a8d42 | 67 | LTTNG_CONSUMER_ROTATE_CHANNEL, |
00fb02ac | 68 | LTTNG_CONSUMER_ROTATE_RENAME, |
92816cc3 JG |
69 | LTTNG_CONSUMER_CHECK_ROTATION_PENDING_LOCAL, |
70 | LTTNG_CONSUMER_CHECK_ROTATION_PENDING_RELAY, | |
a1ae2ea5 | 71 | LTTNG_CONSUMER_MKDIR, |
3bd1e081 MD |
72 | }; |
73 | ||
74 | /* State of each fd in consumer */ | |
75 | enum lttng_consumer_stream_state { | |
76 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
77 | LTTNG_CONSUMER_PAUSE_STREAM, | |
78 | LTTNG_CONSUMER_DELETE_STREAM, | |
79 | }; | |
80 | ||
3bd1e081 MD |
81 | enum lttng_consumer_type { |
82 | LTTNG_CONSUMER_UNKNOWN = 0, | |
83 | LTTNG_CONSUMER_KERNEL, | |
7753dea8 MD |
84 | LTTNG_CONSUMER64_UST, |
85 | LTTNG_CONSUMER32_UST, | |
3bd1e081 MD |
86 | }; |
87 | ||
8994307f DG |
88 | enum consumer_endpoint_status { |
89 | CONSUMER_ENDPOINT_ACTIVE, | |
90 | CONSUMER_ENDPOINT_INACTIVE, | |
91 | }; | |
92 | ||
ffe60014 DG |
93 | enum consumer_channel_output { |
94 | CONSUMER_CHANNEL_MMAP = 0, | |
95 | CONSUMER_CHANNEL_SPLICE = 1, | |
96 | }; | |
97 | ||
98 | enum consumer_channel_type { | |
99 | CONSUMER_CHANNEL_TYPE_METADATA = 0, | |
d88aee68 | 100 | CONSUMER_CHANNEL_TYPE_DATA = 1, |
ffe60014 DG |
101 | }; |
102 | ||
51230d70 DG |
103 | extern struct lttng_consumer_global_data consumer_data; |
104 | ||
ffe60014 DG |
105 | struct stream_list { |
106 | struct cds_list_head head; | |
107 | unsigned int count; | |
108 | }; | |
109 | ||
331744e3 JD |
110 | /* Stub. */ |
111 | struct consumer_metadata_cache; | |
112 | ||
3bd1e081 | 113 | struct lttng_consumer_channel { |
ffe60014 | 114 | /* HT node used for consumer_data.channel_ht */ |
d88aee68 | 115 | struct lttng_ht_node_u64 node; |
5c3892a6 JG |
116 | /* HT node used for consumer_data.channels_by_session_id_ht */ |
117 | struct lttng_ht_node_u64 channels_by_session_id_ht_node; | |
ffe60014 | 118 | /* Indexed key. Incremented value in the consumer. */ |
d88aee68 | 119 | uint64_t key; |
ffe60014 DG |
120 | /* Number of streams referencing this channel */ |
121 | int refcount; | |
122 | /* Tracing session id on the session daemon side. */ | |
123 | uint64_t session_id; | |
1950109e JD |
124 | /* |
125 | * Session id when requesting metadata to the session daemon for | |
126 | * a session with per-PID buffers. | |
127 | */ | |
128 | uint64_t session_id_per_pid; | |
ffe60014 DG |
129 | /* Channel trace file path name. */ |
130 | char pathname[PATH_MAX]; | |
131 | /* Channel name. */ | |
132 | char name[LTTNG_SYMBOL_NAME_LEN]; | |
567eb353 | 133 | /* UID and GID of the session owning this channel. */ |
ffe60014 DG |
134 | uid_t uid; |
135 | gid_t gid; | |
da009f2c MD |
136 | /* Relayd id of the channel. -1ULL if it does not apply. */ |
137 | uint64_t relayd_id; | |
c30aaa51 | 138 | /* |
ffe60014 DG |
139 | * Number of streams NOT initialized yet. This is used in order to not |
140 | * delete this channel if streams are getting initialized. | |
c30aaa51 | 141 | */ |
ffe60014 DG |
142 | unsigned int nb_init_stream_left; |
143 | /* Output type (mmap or splice). */ | |
144 | enum consumer_channel_output output; | |
145 | /* Channel type for stream */ | |
146 | enum consumer_channel_type type; | |
c30aaa51 | 147 | |
3bd1e081 | 148 | /* For UST */ |
567eb353 | 149 | uid_t ust_app_uid; /* Application UID. */ |
ffe60014 DG |
150 | struct ustctl_consumer_channel *uchan; |
151 | unsigned char uuid[UUID_STR_LEN]; | |
152 | /* | |
153 | * Temporary stream list used to store the streams once created and waiting | |
154 | * to be sent to the session daemon by receiving the | |
155 | * LTTNG_CONSUMER_GET_CHANNEL. | |
156 | */ | |
157 | struct stream_list streams; | |
07b86b52 | 158 | |
d88aee68 DG |
159 | /* |
160 | * Set if the channel is metadata. We keep a reference to the stream | |
161 | * because we have to flush data once pushed by the session daemon. For a | |
162 | * regular channel, this is always set to NULL. | |
163 | */ | |
164 | struct lttng_consumer_stream *metadata_stream; | |
d8ef542d MD |
165 | |
166 | /* for UST */ | |
167 | int wait_fd; | |
168 | /* Node within channel thread ht */ | |
169 | struct lttng_ht_node_u64 wait_fd_node; | |
331744e3 JD |
170 | |
171 | /* Metadata cache is metadata channel */ | |
172 | struct consumer_metadata_cache *metadata_cache; | |
cf0bcb51 | 173 | |
d3e2ba59 | 174 | /* For UST metadata periodical flush */ |
331744e3 JD |
175 | int switch_timer_enabled; |
176 | timer_t switch_timer; | |
4419b4fb MD |
177 | int switch_timer_error; |
178 | ||
d3e2ba59 JD |
179 | /* For the live mode */ |
180 | int live_timer_enabled; | |
181 | timer_t live_timer; | |
182 | int live_timer_error; | |
183 | ||
b3530820 JG |
184 | /* For channel monitoring timer. */ |
185 | int monitor_timer_enabled; | |
186 | timer_t monitor_timer; | |
187 | ||
1624d5b7 JD |
188 | /* On-disk circular buffer */ |
189 | uint64_t tracefile_size; | |
190 | uint64_t tracefile_count; | |
2bba9e53 DG |
191 | /* |
192 | * Monitor or not the streams of this channel meaning this indicates if the | |
193 | * streams should be sent to the data/metadata thread or added to the no | |
194 | * monitor list of the channel. | |
195 | */ | |
196 | unsigned int monitor; | |
a9838785 MD |
197 | |
198 | /* | |
199 | * Channel lock. | |
200 | * | |
ec6ea7d0 MD |
201 | * This lock protects against concurrent update of channel. |
202 | * | |
a9838785 | 203 | * This is nested INSIDE the consumer data lock. |
ec6ea7d0 | 204 | * This is nested OUTSIDE the channel timer lock. |
a9838785 MD |
205 | * This is nested OUTSIDE the metadata cache lock. |
206 | * This is nested OUTSIDE stream lock. | |
207 | * This is nested OUTSIDE consumer_relayd_sock_pair lock. | |
208 | */ | |
209 | pthread_mutex_t lock; | |
ec6ea7d0 MD |
210 | |
211 | /* | |
212 | * Channel teardown lock. | |
213 | * | |
214 | * This lock protect against teardown of channel. It is _never_ | |
215 | * taken by the timer handler. | |
216 | * | |
217 | * This is nested INSIDE the consumer data lock. | |
218 | * This is nested INSIDE the channel lock. | |
219 | * This is nested OUTSIDE the metadata cache lock. | |
220 | * This is nested OUTSIDE stream lock. | |
221 | * This is nested OUTSIDE consumer_relayd_sock_pair lock. | |
222 | */ | |
223 | pthread_mutex_t timer_lock; | |
ecc48a90 JD |
224 | |
225 | /* Timer value in usec for live streaming. */ | |
226 | unsigned int live_timer_interval; | |
d7ba1388 | 227 | |
4628484a MD |
228 | int *stream_fds; |
229 | int nr_stream_fds; | |
3d071855 | 230 | char root_shm_path[PATH_MAX]; |
d7ba1388 | 231 | char shm_path[PATH_MAX]; |
fb83fe64 JD |
232 | /* Total number of discarded events for that channel. */ |
233 | uint64_t discarded_events; | |
234 | /* Total number of missed packets due to overwriting (overwrite). */ | |
235 | uint64_t lost_packets; | |
001b7e62 MD |
236 | |
237 | bool streams_sent_to_relayd; | |
d73bf3d7 | 238 | |
d73bf3d7 JD |
239 | /* |
240 | * The chunk id where we currently write the data. This value is sent | |
241 | * to the relay when we add a stream and when a stream rotates. This | |
242 | * allows to keep track of where each stream on the relay is writing. | |
243 | */ | |
244 | uint64_t current_chunk_id; | |
3bd1e081 MD |
245 | }; |
246 | ||
3bd1e081 MD |
247 | /* |
248 | * Internal representation of the streams, sessiond_key is used to identify | |
249 | * uniquely a stream. | |
250 | */ | |
251 | struct lttng_consumer_stream { | |
53632229 | 252 | /* HT node used by the data_ht and metadata_ht */ |
d88aee68 | 253 | struct lttng_ht_node_u64 node; |
d8ef542d MD |
254 | /* stream indexed per channel key node */ |
255 | struct lttng_ht_node_u64 node_channel_id; | |
53632229 | 256 | /* HT node used in consumer_data.stream_list_ht */ |
d88aee68 | 257 | struct lttng_ht_node_u64 node_session_id; |
ffe60014 DG |
258 | /* Pointer to associated channel. */ |
259 | struct lttng_consumer_channel *chan; | |
260 | ||
261 | /* Key by which the stream is indexed for 'node'. */ | |
d88aee68 | 262 | uint64_t key; |
3bd1e081 | 263 | /* |
ffe60014 DG |
264 | * File descriptor of the data output file. This can be either a file or a |
265 | * socket fd for relayd streaming. | |
3bd1e081 | 266 | */ |
3bd1e081 | 267 | int out_fd; /* output file to write the data */ |
ffe60014 DG |
268 | /* Write position in the output file descriptor */ |
269 | off_t out_fd_offset; | |
e5d1a9b3 MD |
270 | /* Amount of bytes written to the output */ |
271 | uint64_t output_written; | |
3bd1e081 | 272 | enum lttng_consumer_stream_state state; |
b5c5fc29 | 273 | int shm_fd_is_copy; |
4078b776 | 274 | int data_read; |
d056b477 | 275 | int hangup_flush_done; |
c585821b | 276 | |
0dd01979 MD |
277 | /* |
278 | * Whether the stream is in a "complete" state (e.g. it does not have a | |
279 | * partially written sub-buffer. | |
280 | * | |
281 | * Initialized to "false" on stream creation (first packet is empty). | |
282 | * | |
283 | * The various transitions of the quiescent state are: | |
284 | * - On "start" tracing: set to false, since the stream is not | |
285 | * "complete". | |
286 | * - On "stop" tracing: if !quiescent -> flush FINAL (update | |
287 | * timestamp_end), and set to true; the stream has entered a | |
288 | * complete/quiescent state. | |
289 | * - On "destroy" or stream/application hang-up: if !quiescent -> | |
290 | * flush FINAL, and set to true. | |
291 | * | |
292 | * NOTE: Update and read are protected by the stream lock. | |
293 | */ | |
294 | bool quiescent; | |
295 | ||
c585821b MD |
296 | /* |
297 | * metadata_timer_lock protects flags waiting_on_metadata and | |
298 | * missed_metadata_flush. | |
299 | */ | |
300 | pthread_mutex_t metadata_timer_lock; | |
301 | /* | |
302 | * Flag set when awaiting metadata to be pushed. Used in the | |
303 | * timer thread to skip waiting on the stream (and stream lock) to | |
304 | * ensure we can proceed to flushing metadata in live mode. | |
305 | */ | |
306 | bool waiting_on_metadata; | |
307 | /* Raised when a timer misses a metadata flush. */ | |
308 | bool missed_metadata_flush; | |
309 | ||
ffe60014 DG |
310 | enum lttng_event_output output; |
311 | /* Maximum subbuffer size. */ | |
312 | unsigned long max_sb_size; | |
313 | ||
314 | /* | |
315 | * Still used by the kernel for MMAP output. For UST, the ustctl getter is | |
316 | * used for the mmap base and offset. | |
317 | */ | |
318 | void *mmap_base; | |
319 | unsigned long mmap_len; | |
320 | ||
321 | /* For UST */ | |
322 | ||
323 | int wait_fd; | |
6df2e2c9 MD |
324 | /* UID/GID of the user owning the session to which stream belongs */ |
325 | uid_t uid; | |
326 | gid_t gid; | |
00e2e675 | 327 | /* Network sequence number. Indicating on which relayd socket it goes. */ |
d88aee68 | 328 | uint64_t net_seq_idx; |
d01178b6 DG |
329 | /* |
330 | * Indicate if this stream was successfully sent to a relayd. This is set | |
331 | * after the refcount of the relayd is incremented and is checked when the | |
332 | * stream is closed before decrementing the refcount in order to avoid an | |
333 | * unbalanced state. | |
334 | */ | |
335 | unsigned int sent_to_relayd; | |
336 | ||
00e2e675 DG |
337 | /* Identify if the stream is the metadata */ |
338 | unsigned int metadata_flag; | |
93ec662e JD |
339 | /* |
340 | * Last known metadata version, reset the metadata file in case | |
341 | * of change. | |
342 | */ | |
343 | uint64_t metadata_version; | |
00e2e675 DG |
344 | /* Used when the stream is set for network streaming */ |
345 | uint64_t relayd_stream_id; | |
3604f373 DG |
346 | /* |
347 | * When sending a stream packet to a relayd, this number is used to track | |
348 | * the packet sent by the consumer and seen by the relayd. When sending the | |
349 | * data header to the relayd, this number is sent and if the transmission | |
350 | * was successful, it is incremented. | |
351 | * | |
352 | * Even if the full data is not fully transmitted it won't matter since | |
353 | * only two possible error can happen after that where either the relayd | |
354 | * died or a read error is detected on the stream making this value useless | |
355 | * after that. | |
356 | * | |
357 | * This value SHOULD be read/updated atomically or with the lock acquired. | |
358 | */ | |
173af62f | 359 | uint64_t next_net_seq_num; |
63281d5d | 360 | /* |
74251bb8 DG |
361 | * Lock to use the stream FDs since they are used between threads. |
362 | * | |
363 | * This is nested INSIDE the consumer_data lock. | |
a9838785 | 364 | * This is nested INSIDE the channel lock. |
ec6ea7d0 | 365 | * This is nested INSIDE the channel timer lock. |
3dad2c0f | 366 | * This is nested OUTSIDE the metadata cache lock. |
74251bb8 | 367 | * This is nested OUTSIDE consumer_relayd_sock_pair lock. |
63281d5d | 368 | */ |
53632229 DG |
369 | pthread_mutex_t lock; |
370 | /* Tracing session id */ | |
371 | uint64_t session_id; | |
8994307f DG |
372 | /* |
373 | * Indicates if the stream end point is still active or not (network | |
374 | * streaming or local file system). The thread "owning" the stream is | |
375 | * handling this status and can be notified of a state change through the | |
376 | * consumer data appropriate pipe. | |
377 | */ | |
378 | enum consumer_endpoint_status endpoint_status; | |
ffe60014 DG |
379 | /* Stream name. Format is: <channel_name>_<cpu_number> */ |
380 | char name[LTTNG_SYMBOL_NAME_LEN]; | |
381 | /* Internal state of libustctl. */ | |
382 | struct ustctl_consumer_stream *ustream; | |
383 | struct cds_list_head send_node; | |
1624d5b7 JD |
384 | /* On-disk circular buffer */ |
385 | uint64_t tracefile_size_current; | |
386 | uint64_t tracefile_count_current; | |
4891ece8 DG |
387 | /* |
388 | * Monitor or not the streams of this channel meaning this indicates if the | |
389 | * streams should be sent to the data/metadata thread or added to the no | |
390 | * monitor list of the channel. | |
391 | */ | |
392 | unsigned int monitor; | |
393 | /* | |
394 | * Indicate if the stream is globally visible meaning that it has been | |
395 | * added to the multiple hash tables. If *not* set, NO lock should be | |
396 | * acquired in the destroy path. | |
397 | */ | |
398 | unsigned int globally_visible; | |
feb78e88 MD |
399 | /* |
400 | * Pipe to wake up the metadata poll thread when the UST metadata | |
401 | * cache is updated. | |
402 | */ | |
403 | int ust_metadata_poll_pipe[2]; | |
404 | /* | |
405 | * How much metadata was read from the metadata cache and sent | |
406 | * to the channel. | |
407 | */ | |
408 | uint64_t ust_metadata_pushed; | |
fb83fe64 JD |
409 | /* |
410 | * Copy of the last discarded event value to detect the overflow of | |
411 | * the counter. | |
412 | */ | |
413 | uint64_t last_discarded_events; | |
414 | /* Copy of the sequence number of the last packet extracted. */ | |
415 | uint64_t last_sequence_number; | |
e098433c | 416 | /* |
92816cc3 JG |
417 | * A stream is created with a trace_archive_id matching the session's |
418 | * current trace archive id at the time of the creation of the stream. | |
419 | * It is incremented when the rotate_position is reached. | |
e098433c JG |
420 | */ |
421 | uint64_t trace_archive_id; | |
309167d2 | 422 | /* |
f8f3885c | 423 | * Index file object of the index file for this stream. |
309167d2 | 424 | */ |
f8f3885c | 425 | struct lttng_index_file *index_file; |
94d49140 | 426 | |
a2361a61 JD |
427 | /* |
428 | * Local pipe to extract data when using splice. | |
429 | */ | |
430 | int splice_pipe[2]; | |
431 | ||
94d49140 JD |
432 | /* |
433 | * Rendez-vous point between data and metadata stream in live mode. | |
434 | */ | |
435 | pthread_cond_t metadata_rdv; | |
436 | pthread_mutex_t metadata_rdv_lock; | |
02b3d176 | 437 | |
02d02e31 JD |
438 | /* |
439 | * rotate_position represents the position in the ring-buffer that has to | |
440 | * be flushed to disk to complete the ongoing rotation. When that position | |
441 | * is reached, this tracefile can be closed and a new one is created in | |
442 | * channel_read_only_attributes.path. | |
443 | */ | |
444 | unsigned long rotate_position; | |
445 | ||
d9a2e16e JD |
446 | /* |
447 | * Read-only copies of channel values. We cannot safely access the | |
448 | * channel from a stream, so we need to have a local copy of these | |
449 | * fields in the stream object. These fields should be removed from | |
450 | * the stream objects when we introduce refcounting. | |
451 | */ | |
452 | struct { | |
453 | char path[LTTNG_PATH_MAX]; | |
454 | uint64_t tracefile_size; | |
455 | } channel_read_only_attributes; | |
456 | ||
02d02e31 JD |
457 | /* |
458 | * Flag to inform the data or metadata thread that a stream is | |
459 | * ready to be rotated. | |
460 | */ | |
461 | bool rotate_ready; | |
462 | ||
02b3d176 DG |
463 | /* Indicate if the stream still has some data to be read. */ |
464 | unsigned int has_data:1; | |
93ec662e JD |
465 | /* |
466 | * Inform the consumer or relay to reset the metadata | |
467 | * file before writing in it (regeneration). | |
468 | */ | |
469 | unsigned int reset_metadata_flag:1; | |
00e2e675 DG |
470 | }; |
471 | ||
472 | /* | |
473 | * Internal representation of a relayd socket pair. | |
474 | */ | |
475 | struct consumer_relayd_sock_pair { | |
476 | /* Network sequence number. */ | |
da009f2c | 477 | uint64_t net_seq_idx; |
00e2e675 | 478 | /* Number of stream associated with this relayd */ |
97056403 | 479 | int refcount; |
173af62f DG |
480 | |
481 | /* | |
482 | * This flag indicates whether or not we should destroy this object. The | |
483 | * destruction should ONLY occurs when this flag is set and the refcount is | |
484 | * set to zero. | |
485 | */ | |
486 | unsigned int destroy_flag; | |
487 | ||
51d7db73 DG |
488 | /* |
489 | * Mutex protecting the control socket to avoid out of order packets | |
490 | * between threads sending data to the relayd. Since metadata data is sent | |
491 | * over that socket, at least two sendmsg() are needed (header + data) | |
492 | * creating a race for packets to overlap between threads using it. | |
74251bb8 DG |
493 | * |
494 | * This is nested INSIDE the consumer_data lock. | |
495 | * This is nested INSIDE the stream lock. | |
51d7db73 | 496 | */ |
00e2e675 | 497 | pthread_mutex_t ctrl_sock_mutex; |
51d7db73 DG |
498 | |
499 | /* Control socket. Command and metadata are passed over it */ | |
6151a90f | 500 | struct lttcomm_relayd_sock control_sock; |
51d7db73 DG |
501 | |
502 | /* | |
503 | * We don't need a mutex at this point since we only splice or write single | |
504 | * large chunk of data with a header appended at the begining. Moreover, | |
505 | * this socket is for now only used in a single thread. | |
506 | */ | |
6151a90f | 507 | struct lttcomm_relayd_sock data_sock; |
d88aee68 | 508 | struct lttng_ht_node_u64 node; |
c5b6f4f0 | 509 | |
f7079f67 DG |
510 | /* Session id on both sides for the sockets. */ |
511 | uint64_t relayd_session_id; | |
512 | uint64_t sessiond_session_id; | |
9276e5c8 | 513 | struct lttng_consumer_local_data *ctx; |
3bd1e081 MD |
514 | }; |
515 | ||
516 | /* | |
517 | * UST consumer local data to the program. One or more instance per | |
518 | * process. | |
519 | */ | |
520 | struct lttng_consumer_local_data { | |
4078b776 MD |
521 | /* |
522 | * Function to call when data is available on a buffer. | |
523 | * Returns the number of bytes read, or negative error value. | |
524 | */ | |
525 | ssize_t (*on_buffer_ready)(struct lttng_consumer_stream *stream, | |
d41f73b7 | 526 | struct lttng_consumer_local_data *ctx); |
3bd1e081 MD |
527 | /* |
528 | * function to call when we receive a new channel, it receives a | |
529 | * newly allocated channel, depending on the return code of this | |
530 | * function, the new channel will be handled by the application | |
531 | * or the library. | |
532 | * | |
533 | * Returns: | |
534 | * > 0 (success, FD is kept by application) | |
535 | * == 0 (success, FD is left to library) | |
536 | * < 0 (error) | |
537 | */ | |
538 | int (*on_recv_channel)(struct lttng_consumer_channel *channel); | |
539 | /* | |
540 | * function to call when we receive a new stream, it receives a | |
541 | * newly allocated stream, depending on the return code of this | |
542 | * function, the new stream will be handled by the application | |
543 | * or the library. | |
544 | * | |
545 | * Returns: | |
546 | * > 0 (success, FD is kept by application) | |
547 | * == 0 (success, FD is left to library) | |
548 | * < 0 (error) | |
549 | */ | |
550 | int (*on_recv_stream)(struct lttng_consumer_stream *stream); | |
551 | /* | |
552 | * function to call when a stream is getting updated by the session | |
553 | * daemon, this function receives the sessiond key and the new | |
554 | * state, depending on the return code of this function the | |
555 | * update of state for the stream is handled by the application | |
556 | * or the library. | |
557 | * | |
558 | * Returns: | |
559 | * > 0 (success, FD is kept by application) | |
560 | * == 0 (success, FD is left to library) | |
561 | * < 0 (error) | |
562 | */ | |
30319bcb | 563 | int (*on_update_stream)(uint64_t sessiond_key, uint32_t state); |
331744e3 | 564 | enum lttng_consumer_type type; |
3bd1e081 MD |
565 | /* socket to communicate errors with sessiond */ |
566 | int consumer_error_socket; | |
75d83e50 | 567 | /* socket to ask metadata to sessiond. */ |
331744e3 | 568 | int consumer_metadata_socket; |
ace17efa MD |
569 | /* |
570 | * Protect consumer_metadata_socket. | |
571 | * | |
572 | * This is nested OUTSIDE the metadata cache lock. | |
573 | */ | |
75d83e50 | 574 | pthread_mutex_t metadata_socket_lock; |
3bd1e081 MD |
575 | /* socket to exchange commands with sessiond */ |
576 | char *consumer_command_sock_path; | |
577 | /* communication with splice */ | |
d8ef542d | 578 | int consumer_channel_pipe[2]; |
50f8ae69 | 579 | /* Data stream poll thread pipe. To transfer data stream to the thread */ |
acdb9057 | 580 | struct lttng_pipe *consumer_data_pipe; |
02b3d176 DG |
581 | |
582 | /* | |
583 | * Data thread use that pipe to catch wakeup from read subbuffer that | |
584 | * detects that there is still data to be read for the stream encountered. | |
585 | * Before doing so, the stream is flagged to indicate that there is still | |
586 | * data to be read. | |
587 | * | |
588 | * Both pipes (read/write) are owned and used inside the data thread. | |
589 | */ | |
590 | struct lttng_pipe *consumer_wakeup_pipe; | |
591 | /* Indicate if the wakeup thread has been notified. */ | |
592 | unsigned int has_wakeup:1; | |
593 | ||
3bd1e081 MD |
594 | /* to let the signal handler wake up the fd receiver thread */ |
595 | int consumer_should_quit[2]; | |
fb3a43a9 | 596 | /* Metadata poll thread pipe. Transfer metadata stream to it */ |
13886d2d | 597 | struct lttng_pipe *consumer_metadata_pipe; |
b3530820 JG |
598 | /* |
599 | * Pipe used by the channel monitoring timers to provide state samples | |
600 | * to the session daemon (write-only). | |
601 | */ | |
602 | int channel_monitor_pipe; | |
3bd1e081 MD |
603 | }; |
604 | ||
605 | /* | |
606 | * Library-level data. One instance per process. | |
607 | */ | |
608 | struct lttng_consumer_global_data { | |
609 | /* | |
e4421fec DG |
610 | * At this time, this lock is used to ensure coherence between the count |
611 | * and number of element in the hash table. It's also a protection for | |
6065ceec DG |
612 | * concurrent read/write between threads. |
613 | * | |
74251bb8 DG |
614 | * This is nested OUTSIDE the stream lock. |
615 | * This is nested OUTSIDE the consumer_relayd_sock_pair lock. | |
3bd1e081 MD |
616 | */ |
617 | pthread_mutex_t lock; | |
e4421fec | 618 | |
3bd1e081 | 619 | /* |
3cc2f24a DG |
620 | * Number of streams in the data stream hash table declared outside. |
621 | * Protected by consumer_data.lock. | |
3bd1e081 MD |
622 | */ |
623 | int stream_count; | |
3cc2f24a DG |
624 | |
625 | /* Channel hash table protected by consumer_data.lock. */ | |
e4421fec | 626 | struct lttng_ht *channel_ht; |
5c3892a6 JG |
627 | /* Channel hash table indexed by session id. */ |
628 | struct lttng_ht *channels_by_session_id_ht; | |
3bd1e081 MD |
629 | /* |
630 | * Flag specifying if the local array of FDs needs update in the | |
631 | * poll function. Protected by consumer_data.lock. | |
632 | */ | |
633 | unsigned int need_update; | |
634 | enum lttng_consumer_type type; | |
00e2e675 DG |
635 | |
636 | /* | |
637 | * Relayd socket(s) hashtable indexed by network sequence number. Each | |
638 | * stream has an index which associate the right relayd socket to use. | |
639 | */ | |
640 | struct lttng_ht *relayd_ht; | |
53632229 DG |
641 | |
642 | /* | |
643 | * This hash table contains all streams (metadata and data) indexed by | |
644 | * session id. In other words, the ht is indexed by session id and each | |
645 | * bucket contains the list of associated streams. | |
646 | * | |
647 | * This HT uses the "node_session_id" of the consumer stream. | |
648 | */ | |
649 | struct lttng_ht *stream_list_ht; | |
d8ef542d MD |
650 | |
651 | /* | |
652 | * This HT uses the "node_channel_id" of the consumer stream. | |
653 | */ | |
654 | struct lttng_ht *stream_per_chan_id_ht; | |
28cc88f3 JG |
655 | |
656 | /* | |
657 | * Trace chunk registry indexed by (session_id, chunk_id). | |
658 | */ | |
659 | struct lttng_trace_chunk_registry *chunk_registry; | |
3bd1e081 MD |
660 | }; |
661 | ||
10211f5c MD |
662 | /* |
663 | * Set to nonzero when the consumer is exiting. Updated by signal | |
664 | * handler and thread exit, read by threads. | |
665 | */ | |
666 | extern int consumer_quit; | |
667 | ||
13675d0e MD |
668 | /* |
669 | * Set to nonzero when the consumer is exiting. Updated by signal | |
670 | * handler and thread exit, read by threads. | |
671 | */ | |
672 | extern int consumer_quit; | |
673 | ||
cf0bcb51 JG |
674 | /* Flag used to temporarily pause data consumption from testpoints. */ |
675 | extern int data_consumption_paused; | |
676 | ||
92816cc3 JG |
677 | /* Return a human-readable consumer type string that is suitable for logging. */ |
678 | static inline | |
679 | const char *lttng_consumer_type_str(enum lttng_consumer_type type) | |
680 | { | |
681 | switch (type) { | |
682 | case LTTNG_CONSUMER_UNKNOWN: | |
683 | return "unknown"; | |
684 | case LTTNG_CONSUMER_KERNEL: | |
685 | return "kernel"; | |
686 | case LTTNG_CONSUMER32_UST: | |
687 | return "32-bit user space"; | |
688 | case LTTNG_CONSUMER64_UST: | |
689 | return "64-bit user space"; | |
690 | default: | |
691 | abort(); | |
692 | } | |
693 | } | |
694 | ||
e4421fec DG |
695 | /* |
696 | * Init consumer data structures. | |
697 | */ | |
282dadbc | 698 | int lttng_consumer_init(void); |
e4421fec | 699 | |
3bd1e081 MD |
700 | /* |
701 | * Set the error socket for communication with a session daemon. | |
702 | */ | |
ffe60014 DG |
703 | void lttng_consumer_set_error_sock(struct lttng_consumer_local_data *ctx, |
704 | int sock); | |
3bd1e081 MD |
705 | |
706 | /* | |
707 | * Set the command socket path for communication with a session daemon. | |
708 | */ | |
ffe60014 | 709 | void lttng_consumer_set_command_sock_path( |
3bd1e081 MD |
710 | struct lttng_consumer_local_data *ctx, char *sock); |
711 | ||
712 | /* | |
713 | * Send return code to session daemon. | |
714 | * | |
715 | * Returns the return code of sendmsg : the number of bytes transmitted or -1 | |
716 | * on error. | |
717 | */ | |
ffe60014 | 718 | int lttng_consumer_send_error(struct lttng_consumer_local_data *ctx, int cmd); |
3bd1e081 MD |
719 | |
720 | /* | |
721 | * Called from signal handler to ensure a clean exit. | |
722 | */ | |
ffe60014 | 723 | void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx); |
3bd1e081 MD |
724 | |
725 | /* | |
726 | * Cleanup the daemon's socket on exit. | |
727 | */ | |
ffe60014 | 728 | void lttng_consumer_cleanup(void); |
3bd1e081 | 729 | |
3bd1e081 MD |
730 | /* |
731 | * Poll on the should_quit pipe and the command socket return -1 on error and | |
732 | * should exit, 0 if data is available on the command socket | |
733 | */ | |
ffe60014 | 734 | int lttng_consumer_poll_socket(struct pollfd *kconsumer_sockpoll); |
3bd1e081 | 735 | |
d9a2e16e JD |
736 | /* |
737 | * Copy the fields from the channel that need to be accessed (read-only) | |
738 | * directly from the stream. | |
739 | */ | |
740 | void consumer_stream_update_channel_attributes( | |
741 | struct lttng_consumer_stream *stream, | |
742 | struct lttng_consumer_channel *channel); | |
743 | ||
d88aee68 DG |
744 | struct lttng_consumer_stream *consumer_allocate_stream(uint64_t channel_key, |
745 | uint64_t stream_key, | |
3bd1e081 | 746 | enum lttng_consumer_stream_state state, |
ffe60014 | 747 | const char *channel_name, |
6df2e2c9 | 748 | uid_t uid, |
00e2e675 | 749 | gid_t gid, |
57a269f2 | 750 | uint64_t relayd_id, |
53632229 | 751 | uint64_t session_id, |
ffe60014 DG |
752 | int cpu, |
753 | int *alloc_ret, | |
4891ece8 | 754 | enum consumer_channel_type type, |
e098433c JG |
755 | unsigned int monitor, |
756 | uint64_t trace_archive_id); | |
d88aee68 | 757 | struct lttng_consumer_channel *consumer_allocate_channel(uint64_t key, |
ffe60014 DG |
758 | uint64_t session_id, |
759 | const char *pathname, | |
760 | const char *name, | |
761 | uid_t uid, | |
762 | gid_t gid, | |
57a269f2 | 763 | uint64_t relayd_id, |
1624d5b7 JD |
764 | enum lttng_event_output output, |
765 | uint64_t tracefile_size, | |
2bba9e53 | 766 | uint64_t tracefile_count, |
1950109e | 767 | uint64_t session_id_per_pid, |
ecc48a90 | 768 | unsigned int monitor, |
d7ba1388 | 769 | unsigned int live_timer_interval, |
3d071855 | 770 | const char *root_shm_path, |
d7ba1388 | 771 | const char *shm_path); |
ffe60014 | 772 | void consumer_del_stream(struct lttng_consumer_stream *stream, |
e316aad5 | 773 | struct lttng_ht *ht); |
ffe60014 | 774 | void consumer_del_metadata_stream(struct lttng_consumer_stream *stream, |
e316aad5 | 775 | struct lttng_ht *ht); |
d8ef542d MD |
776 | int consumer_add_channel(struct lttng_consumer_channel *channel, |
777 | struct lttng_consumer_local_data *ctx); | |
ffe60014 | 778 | void consumer_del_channel(struct lttng_consumer_channel *channel); |
3bd1e081 | 779 | |
00e2e675 | 780 | /* lttng-relayd consumer command */ |
d88aee68 | 781 | struct consumer_relayd_sock_pair *consumer_find_relayd(uint64_t key); |
10a50311 | 782 | int consumer_send_relayd_stream(struct lttng_consumer_stream *stream, char *path); |
a4baae1b | 783 | int consumer_send_relayd_streams_sent(uint64_t net_seq_idx); |
10a50311 | 784 | void close_relayd_stream(struct lttng_consumer_stream *stream); |
d88aee68 | 785 | struct lttng_consumer_channel *consumer_find_channel(uint64_t key); |
00e2e675 DG |
786 | int consumer_handle_stream_before_relayd(struct lttng_consumer_stream *stream, |
787 | size_t data_size); | |
c869f647 | 788 | void consumer_steal_stream_key(int key, struct lttng_ht *ht); |
00e2e675 | 789 | |
ffe60014 | 790 | struct lttng_consumer_local_data *lttng_consumer_create( |
3bd1e081 | 791 | enum lttng_consumer_type type, |
4078b776 | 792 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
d41f73b7 | 793 | struct lttng_consumer_local_data *ctx), |
3bd1e081 MD |
794 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
795 | int (*recv_stream)(struct lttng_consumer_stream *stream), | |
30319bcb | 796 | int (*update_stream)(uint64_t sessiond_key, uint32_t state)); |
ffe60014 DG |
797 | void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx); |
798 | ssize_t lttng_consumer_on_read_subbuffer_mmap( | |
3bd1e081 | 799 | struct lttng_consumer_local_data *ctx, |
1d4dfdef | 800 | struct lttng_consumer_stream *stream, unsigned long len, |
309167d2 | 801 | unsigned long padding, |
50adc264 | 802 | struct ctf_packet_index *index); |
ffe60014 | 803 | ssize_t lttng_consumer_on_read_subbuffer_splice( |
3bd1e081 | 804 | struct lttng_consumer_local_data *ctx, |
1d4dfdef | 805 | struct lttng_consumer_stream *stream, unsigned long len, |
309167d2 | 806 | unsigned long padding, |
50adc264 | 807 | struct ctf_packet_index *index); |
15055ce5 | 808 | int lttng_consumer_sample_snapshot_positions(struct lttng_consumer_stream *stream); |
ffe60014 DG |
809 | int lttng_consumer_take_snapshot(struct lttng_consumer_stream *stream); |
810 | int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream *stream, | |
3bd1e081 | 811 | unsigned long *pos); |
15055ce5 JD |
812 | int lttng_consumer_get_consumed_snapshot(struct lttng_consumer_stream *stream, |
813 | unsigned long *pos); | |
6d574024 DG |
814 | int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream); |
815 | int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream); | |
ffe60014 DG |
816 | void *consumer_thread_metadata_poll(void *data); |
817 | void *consumer_thread_data_poll(void *data); | |
818 | void *consumer_thread_sessiond_poll(void *data); | |
d8ef542d | 819 | void *consumer_thread_channel_poll(void *data); |
ffe60014 | 820 | int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
3bd1e081 MD |
821 | int sock, struct pollfd *consumer_sockpoll); |
822 | ||
4078b776 | 823 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
824 | struct lttng_consumer_local_data *ctx); |
825 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream); | |
2527bf85 | 826 | void consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type, |
7735ef9e | 827 | struct lttng_consumer_local_data *ctx, int sock, |
6151a90f | 828 | struct pollfd *consumer_sockpoll, struct lttcomm_relayd_sock *relayd_sock, |
d3e2ba59 | 829 | uint64_t sessiond_id, uint64_t relayd_session_id); |
a6ba4fe1 DG |
830 | void consumer_flag_relayd_for_destroy( |
831 | struct consumer_relayd_sock_pair *relayd); | |
6d805429 | 832 | int consumer_data_pending(uint64_t id); |
f50f23d9 | 833 | int consumer_send_status_msg(int sock, int ret_code); |
ffe60014 DG |
834 | int consumer_send_status_channel(int sock, |
835 | struct lttng_consumer_channel *channel); | |
a0cbdd2e MD |
836 | void notify_thread_del_channel(struct lttng_consumer_local_data *ctx, |
837 | uint64_t key); | |
51230d70 | 838 | void consumer_destroy_relayd(struct consumer_relayd_sock_pair *relayd); |
d07ceecd MD |
839 | unsigned long consumer_get_consume_start_pos(unsigned long consumed_pos, |
840 | unsigned long produced_pos, uint64_t nb_packets_per_stream, | |
841 | uint64_t max_sb_size); | |
66d583dc | 842 | void consumer_add_data_stream(struct lttng_consumer_stream *stream); |
5ab66908 | 843 | void consumer_del_stream_for_data(struct lttng_consumer_stream *stream); |
66d583dc | 844 | void consumer_add_metadata_stream(struct lttng_consumer_stream *stream); |
5ab66908 | 845 | void consumer_del_stream_for_metadata(struct lttng_consumer_stream *stream); |
309167d2 | 846 | int consumer_create_index_file(struct lttng_consumer_stream *stream); |
92b7a7f8 MD |
847 | int lttng_consumer_rotate_channel(struct lttng_consumer_channel *channel, |
848 | uint64_t key, const char *path, uint64_t relayd_id, | |
849 | uint32_t metadata, uint64_t new_chunk_id, | |
850 | struct lttng_consumer_local_data *ctx); | |
02d02e31 | 851 | int lttng_consumer_stream_is_rotate_ready(struct lttng_consumer_stream *stream); |
d73bf3d7 | 852 | int lttng_consumer_rotate_stream(struct lttng_consumer_local_data *ctx, |
02d02e31 | 853 | struct lttng_consumer_stream *stream, bool *rotated); |
92b7a7f8 MD |
854 | int lttng_consumer_rotate_ready_streams(struct lttng_consumer_channel *channel, |
855 | uint64_t key, struct lttng_consumer_local_data *ctx); | |
00fb02ac JD |
856 | int lttng_consumer_rotate_rename(const char *current_path, const char *new_path, |
857 | uid_t uid, gid_t gid, uint64_t relayd_id); | |
92816cc3 JG |
858 | int lttng_consumer_check_rotation_pending_local(uint64_t session_id, |
859 | uint64_t chunk_id); | |
860 | int lttng_consumer_check_rotation_pending_relay(uint64_t session_id, | |
5c408ad8 | 861 | uint64_t relayd_id, uint64_t chunk_id); |
d73bf3d7 | 862 | void lttng_consumer_reset_stream_rotate_state(struct lttng_consumer_stream *stream); |
a1ae2ea5 JD |
863 | int lttng_consumer_mkdir(const char *path, uid_t uid, gid_t gid, |
864 | uint64_t relayd_id); | |
9276e5c8 | 865 | void lttng_consumer_cleanup_relayd(struct consumer_relayd_sock_pair *relayd); |
d41f73b7 | 866 | |
f02e1e8a | 867 | #endif /* LIB_CONSUMER_H */ |