Commit | Line | Data |
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3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
00e2e675 | 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 | ||
20 | #define _GNU_SOURCE | |
21 | #include <assert.h> | |
3bd1e081 MD |
22 | #include <poll.h> |
23 | #include <pthread.h> | |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | #include <sys/mman.h> | |
27 | #include <sys/socket.h> | |
28 | #include <sys/types.h> | |
29 | #include <unistd.h> | |
77c7c900 | 30 | #include <inttypes.h> |
331744e3 | 31 | #include <signal.h> |
3bd1e081 | 32 | |
51a9e1c7 | 33 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 34 | #include <common/common.h> |
fb3a43a9 DG |
35 | #include <common/utils.h> |
36 | #include <common/compat/poll.h> | |
f263b7fd | 37 | #include <common/compat/endian.h> |
309167d2 | 38 | #include <common/index/index.h> |
10a8a223 | 39 | #include <common/kernel-ctl/kernel-ctl.h> |
00e2e675 | 40 | #include <common/sessiond-comm/relayd.h> |
10a8a223 DG |
41 | #include <common/sessiond-comm/sessiond-comm.h> |
42 | #include <common/kernel-consumer/kernel-consumer.h> | |
00e2e675 | 43 | #include <common/relayd/relayd.h> |
10a8a223 | 44 | #include <common/ust-consumer/ust-consumer.h> |
d3e2ba59 | 45 | #include <common/consumer-timer.h> |
10a8a223 DG |
46 | |
47 | #include "consumer.h" | |
1d1a276c | 48 | #include "consumer-stream.h" |
2d57de81 | 49 | #include "consumer-testpoint.h" |
3bd1e081 MD |
50 | |
51 | struct lttng_consumer_global_data consumer_data = { | |
3bd1e081 MD |
52 | .stream_count = 0, |
53 | .need_update = 1, | |
54 | .type = LTTNG_CONSUMER_UNKNOWN, | |
55 | }; | |
56 | ||
d8ef542d MD |
57 | enum consumer_channel_action { |
58 | CONSUMER_CHANNEL_ADD, | |
a0cbdd2e | 59 | CONSUMER_CHANNEL_DEL, |
d8ef542d MD |
60 | CONSUMER_CHANNEL_QUIT, |
61 | }; | |
62 | ||
63 | struct consumer_channel_msg { | |
64 | enum consumer_channel_action action; | |
a0cbdd2e MD |
65 | struct lttng_consumer_channel *chan; /* add */ |
66 | uint64_t key; /* del */ | |
d8ef542d MD |
67 | }; |
68 | ||
3bd1e081 MD |
69 | /* |
70 | * Flag to inform the polling thread to quit when all fd hung up. Updated by | |
71 | * the consumer_thread_receive_fds when it notices that all fds has hung up. | |
72 | * Also updated by the signal handler (consumer_should_exit()). Read by the | |
73 | * polling threads. | |
74 | */ | |
a98dae5f | 75 | volatile int consumer_quit; |
3bd1e081 | 76 | |
43c34bc3 | 77 | /* |
43c34bc3 DG |
78 | * Global hash table containing respectively metadata and data streams. The |
79 | * stream element in this ht should only be updated by the metadata poll thread | |
80 | * for the metadata and the data poll thread for the data. | |
81 | */ | |
40dc48e0 DG |
82 | static struct lttng_ht *metadata_ht; |
83 | static struct lttng_ht *data_ht; | |
43c34bc3 | 84 | |
acdb9057 DG |
85 | /* |
86 | * Notify a thread lttng pipe to poll back again. This usually means that some | |
87 | * global state has changed so we just send back the thread in a poll wait | |
88 | * call. | |
89 | */ | |
90 | static void notify_thread_lttng_pipe(struct lttng_pipe *pipe) | |
91 | { | |
92 | struct lttng_consumer_stream *null_stream = NULL; | |
93 | ||
94 | assert(pipe); | |
95 | ||
96 | (void) lttng_pipe_write(pipe, &null_stream, sizeof(null_stream)); | |
97 | } | |
98 | ||
5c635c72 MD |
99 | static void notify_health_quit_pipe(int *pipe) |
100 | { | |
6cd525e8 | 101 | ssize_t ret; |
5c635c72 | 102 | |
6cd525e8 MD |
103 | ret = lttng_write(pipe[1], "4", 1); |
104 | if (ret < 1) { | |
5c635c72 MD |
105 | PERROR("write consumer health quit"); |
106 | } | |
107 | } | |
108 | ||
d8ef542d MD |
109 | static void notify_channel_pipe(struct lttng_consumer_local_data *ctx, |
110 | struct lttng_consumer_channel *chan, | |
a0cbdd2e | 111 | uint64_t key, |
d8ef542d MD |
112 | enum consumer_channel_action action) |
113 | { | |
114 | struct consumer_channel_msg msg; | |
6cd525e8 | 115 | ssize_t ret; |
d8ef542d | 116 | |
e56251fc DG |
117 | memset(&msg, 0, sizeof(msg)); |
118 | ||
d8ef542d MD |
119 | msg.action = action; |
120 | msg.chan = chan; | |
f21dae48 | 121 | msg.key = key; |
6cd525e8 MD |
122 | ret = lttng_write(ctx->consumer_channel_pipe[1], &msg, sizeof(msg)); |
123 | if (ret < sizeof(msg)) { | |
124 | PERROR("notify_channel_pipe write error"); | |
125 | } | |
d8ef542d MD |
126 | } |
127 | ||
a0cbdd2e MD |
128 | void notify_thread_del_channel(struct lttng_consumer_local_data *ctx, |
129 | uint64_t key) | |
130 | { | |
131 | notify_channel_pipe(ctx, NULL, key, CONSUMER_CHANNEL_DEL); | |
132 | } | |
133 | ||
d8ef542d MD |
134 | static int read_channel_pipe(struct lttng_consumer_local_data *ctx, |
135 | struct lttng_consumer_channel **chan, | |
a0cbdd2e | 136 | uint64_t *key, |
d8ef542d MD |
137 | enum consumer_channel_action *action) |
138 | { | |
139 | struct consumer_channel_msg msg; | |
6cd525e8 | 140 | ssize_t ret; |
d8ef542d | 141 | |
6cd525e8 MD |
142 | ret = lttng_read(ctx->consumer_channel_pipe[0], &msg, sizeof(msg)); |
143 | if (ret < sizeof(msg)) { | |
144 | ret = -1; | |
145 | goto error; | |
d8ef542d | 146 | } |
6cd525e8 MD |
147 | *action = msg.action; |
148 | *chan = msg.chan; | |
149 | *key = msg.key; | |
150 | error: | |
151 | return (int) ret; | |
d8ef542d MD |
152 | } |
153 | ||
212d67a2 DG |
154 | /* |
155 | * Cleanup the stream list of a channel. Those streams are not yet globally | |
156 | * visible | |
157 | */ | |
158 | static void clean_channel_stream_list(struct lttng_consumer_channel *channel) | |
159 | { | |
160 | struct lttng_consumer_stream *stream, *stmp; | |
161 | ||
162 | assert(channel); | |
163 | ||
164 | /* Delete streams that might have been left in the stream list. */ | |
165 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
166 | send_node) { | |
167 | cds_list_del(&stream->send_node); | |
168 | /* | |
169 | * Once a stream is added to this list, the buffers were created so we | |
170 | * have a guarantee that this call will succeed. Setting the monitor | |
171 | * mode to 0 so we don't lock nor try to delete the stream from the | |
172 | * global hash table. | |
173 | */ | |
174 | stream->monitor = 0; | |
175 | consumer_stream_destroy(stream, NULL); | |
176 | } | |
177 | } | |
178 | ||
3bd1e081 MD |
179 | /* |
180 | * Find a stream. The consumer_data.lock must be locked during this | |
181 | * call. | |
182 | */ | |
d88aee68 | 183 | static struct lttng_consumer_stream *find_stream(uint64_t key, |
8389e4f8 | 184 | struct lttng_ht *ht) |
3bd1e081 | 185 | { |
e4421fec | 186 | struct lttng_ht_iter iter; |
d88aee68 | 187 | struct lttng_ht_node_u64 *node; |
e4421fec | 188 | struct lttng_consumer_stream *stream = NULL; |
3bd1e081 | 189 | |
8389e4f8 DG |
190 | assert(ht); |
191 | ||
d88aee68 DG |
192 | /* -1ULL keys are lookup failures */ |
193 | if (key == (uint64_t) -1ULL) { | |
7ad0a0cb | 194 | return NULL; |
7a57cf92 | 195 | } |
e4421fec | 196 | |
6065ceec DG |
197 | rcu_read_lock(); |
198 | ||
d88aee68 DG |
199 | lttng_ht_lookup(ht, &key, &iter); |
200 | node = lttng_ht_iter_get_node_u64(&iter); | |
e4421fec DG |
201 | if (node != NULL) { |
202 | stream = caa_container_of(node, struct lttng_consumer_stream, node); | |
3bd1e081 | 203 | } |
e4421fec | 204 | |
6065ceec DG |
205 | rcu_read_unlock(); |
206 | ||
e4421fec | 207 | return stream; |
3bd1e081 MD |
208 | } |
209 | ||
da009f2c | 210 | static void steal_stream_key(uint64_t key, struct lttng_ht *ht) |
7ad0a0cb MD |
211 | { |
212 | struct lttng_consumer_stream *stream; | |
213 | ||
04253271 | 214 | rcu_read_lock(); |
ffe60014 | 215 | stream = find_stream(key, ht); |
04253271 | 216 | if (stream) { |
da009f2c | 217 | stream->key = (uint64_t) -1ULL; |
04253271 MD |
218 | /* |
219 | * We don't want the lookup to match, but we still need | |
220 | * to iterate on this stream when iterating over the hash table. Just | |
221 | * change the node key. | |
222 | */ | |
da009f2c | 223 | stream->node.key = (uint64_t) -1ULL; |
04253271 MD |
224 | } |
225 | rcu_read_unlock(); | |
7ad0a0cb MD |
226 | } |
227 | ||
d56db448 DG |
228 | /* |
229 | * Return a channel object for the given key. | |
230 | * | |
231 | * RCU read side lock MUST be acquired before calling this function and | |
232 | * protects the channel ptr. | |
233 | */ | |
d88aee68 | 234 | struct lttng_consumer_channel *consumer_find_channel(uint64_t key) |
3bd1e081 | 235 | { |
e4421fec | 236 | struct lttng_ht_iter iter; |
d88aee68 | 237 | struct lttng_ht_node_u64 *node; |
e4421fec | 238 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 | 239 | |
d88aee68 DG |
240 | /* -1ULL keys are lookup failures */ |
241 | if (key == (uint64_t) -1ULL) { | |
7ad0a0cb | 242 | return NULL; |
7a57cf92 | 243 | } |
e4421fec | 244 | |
d88aee68 DG |
245 | lttng_ht_lookup(consumer_data.channel_ht, &key, &iter); |
246 | node = lttng_ht_iter_get_node_u64(&iter); | |
e4421fec DG |
247 | if (node != NULL) { |
248 | channel = caa_container_of(node, struct lttng_consumer_channel, node); | |
3bd1e081 | 249 | } |
e4421fec DG |
250 | |
251 | return channel; | |
3bd1e081 MD |
252 | } |
253 | ||
b5a6470f DG |
254 | /* |
255 | * There is a possibility that the consumer does not have enough time between | |
256 | * the close of the channel on the session daemon and the cleanup in here thus | |
257 | * once we have a channel add with an existing key, we know for sure that this | |
258 | * channel will eventually get cleaned up by all streams being closed. | |
259 | * | |
260 | * This function just nullifies the already existing channel key. | |
261 | */ | |
262 | static void steal_channel_key(uint64_t key) | |
263 | { | |
264 | struct lttng_consumer_channel *channel; | |
265 | ||
266 | rcu_read_lock(); | |
267 | channel = consumer_find_channel(key); | |
268 | if (channel) { | |
269 | channel->key = (uint64_t) -1ULL; | |
270 | /* | |
271 | * We don't want the lookup to match, but we still need to iterate on | |
272 | * this channel when iterating over the hash table. Just change the | |
273 | * node key. | |
274 | */ | |
275 | channel->node.key = (uint64_t) -1ULL; | |
276 | } | |
277 | rcu_read_unlock(); | |
278 | } | |
279 | ||
ffe60014 | 280 | static void free_channel_rcu(struct rcu_head *head) |
702b1ea4 | 281 | { |
d88aee68 DG |
282 | struct lttng_ht_node_u64 *node = |
283 | caa_container_of(head, struct lttng_ht_node_u64, head); | |
ffe60014 DG |
284 | struct lttng_consumer_channel *channel = |
285 | caa_container_of(node, struct lttng_consumer_channel, node); | |
702b1ea4 | 286 | |
ffe60014 | 287 | free(channel); |
702b1ea4 MD |
288 | } |
289 | ||
00e2e675 DG |
290 | /* |
291 | * RCU protected relayd socket pair free. | |
292 | */ | |
ffe60014 | 293 | static void free_relayd_rcu(struct rcu_head *head) |
00e2e675 | 294 | { |
d88aee68 DG |
295 | struct lttng_ht_node_u64 *node = |
296 | caa_container_of(head, struct lttng_ht_node_u64, head); | |
00e2e675 DG |
297 | struct consumer_relayd_sock_pair *relayd = |
298 | caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
299 | ||
8994307f DG |
300 | /* |
301 | * Close all sockets. This is done in the call RCU since we don't want the | |
302 | * socket fds to be reassigned thus potentially creating bad state of the | |
303 | * relayd object. | |
304 | * | |
305 | * We do not have to lock the control socket mutex here since at this stage | |
306 | * there is no one referencing to this relayd object. | |
307 | */ | |
308 | (void) relayd_close(&relayd->control_sock); | |
309 | (void) relayd_close(&relayd->data_sock); | |
310 | ||
00e2e675 DG |
311 | free(relayd); |
312 | } | |
313 | ||
314 | /* | |
315 | * Destroy and free relayd socket pair object. | |
00e2e675 | 316 | */ |
51230d70 | 317 | void consumer_destroy_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
318 | { |
319 | int ret; | |
320 | struct lttng_ht_iter iter; | |
321 | ||
173af62f DG |
322 | if (relayd == NULL) { |
323 | return; | |
324 | } | |
325 | ||
00e2e675 DG |
326 | DBG("Consumer destroy and close relayd socket pair"); |
327 | ||
328 | iter.iter.node = &relayd->node.node; | |
329 | ret = lttng_ht_del(consumer_data.relayd_ht, &iter); | |
173af62f | 330 | if (ret != 0) { |
8994307f | 331 | /* We assume the relayd is being or is destroyed */ |
173af62f DG |
332 | return; |
333 | } | |
00e2e675 | 334 | |
00e2e675 | 335 | /* RCU free() call */ |
ffe60014 DG |
336 | call_rcu(&relayd->node.head, free_relayd_rcu); |
337 | } | |
338 | ||
339 | /* | |
340 | * Remove a channel from the global list protected by a mutex. This function is | |
341 | * also responsible for freeing its data structures. | |
342 | */ | |
343 | void consumer_del_channel(struct lttng_consumer_channel *channel) | |
344 | { | |
345 | int ret; | |
346 | struct lttng_ht_iter iter; | |
347 | ||
d88aee68 | 348 | DBG("Consumer delete channel key %" PRIu64, channel->key); |
ffe60014 DG |
349 | |
350 | pthread_mutex_lock(&consumer_data.lock); | |
a9838785 | 351 | pthread_mutex_lock(&channel->lock); |
ffe60014 | 352 | |
212d67a2 DG |
353 | /* Destroy streams that might have been left in the stream list. */ |
354 | clean_channel_stream_list(channel); | |
51e762e5 | 355 | |
d3e2ba59 JD |
356 | if (channel->live_timer_enabled == 1) { |
357 | consumer_timer_live_stop(channel); | |
358 | } | |
359 | ||
ffe60014 DG |
360 | switch (consumer_data.type) { |
361 | case LTTNG_CONSUMER_KERNEL: | |
362 | break; | |
363 | case LTTNG_CONSUMER32_UST: | |
364 | case LTTNG_CONSUMER64_UST: | |
365 | lttng_ustconsumer_del_channel(channel); | |
366 | break; | |
367 | default: | |
368 | ERR("Unknown consumer_data type"); | |
369 | assert(0); | |
370 | goto end; | |
371 | } | |
372 | ||
373 | rcu_read_lock(); | |
374 | iter.iter.node = &channel->node.node; | |
375 | ret = lttng_ht_del(consumer_data.channel_ht, &iter); | |
376 | assert(!ret); | |
377 | rcu_read_unlock(); | |
378 | ||
379 | call_rcu(&channel->node.head, free_channel_rcu); | |
380 | end: | |
a9838785 | 381 | pthread_mutex_unlock(&channel->lock); |
ffe60014 | 382 | pthread_mutex_unlock(&consumer_data.lock); |
00e2e675 DG |
383 | } |
384 | ||
228b5bf7 DG |
385 | /* |
386 | * Iterate over the relayd hash table and destroy each element. Finally, | |
387 | * destroy the whole hash table. | |
388 | */ | |
389 | static void cleanup_relayd_ht(void) | |
390 | { | |
391 | struct lttng_ht_iter iter; | |
392 | struct consumer_relayd_sock_pair *relayd; | |
393 | ||
394 | rcu_read_lock(); | |
395 | ||
396 | cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd, | |
397 | node.node) { | |
51230d70 | 398 | consumer_destroy_relayd(relayd); |
228b5bf7 DG |
399 | } |
400 | ||
228b5bf7 | 401 | rcu_read_unlock(); |
36b588ed MD |
402 | |
403 | lttng_ht_destroy(consumer_data.relayd_ht); | |
228b5bf7 DG |
404 | } |
405 | ||
8994307f DG |
406 | /* |
407 | * Update the end point status of all streams having the given network sequence | |
408 | * index (relayd index). | |
409 | * | |
410 | * It's atomically set without having the stream mutex locked which is fine | |
411 | * because we handle the write/read race with a pipe wakeup for each thread. | |
412 | */ | |
da009f2c | 413 | static void update_endpoint_status_by_netidx(uint64_t net_seq_idx, |
8994307f DG |
414 | enum consumer_endpoint_status status) |
415 | { | |
416 | struct lttng_ht_iter iter; | |
417 | struct lttng_consumer_stream *stream; | |
418 | ||
da009f2c | 419 | DBG("Consumer set delete flag on stream by idx %" PRIu64, net_seq_idx); |
8994307f DG |
420 | |
421 | rcu_read_lock(); | |
422 | ||
423 | /* Let's begin with metadata */ | |
424 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) { | |
425 | if (stream->net_seq_idx == net_seq_idx) { | |
426 | uatomic_set(&stream->endpoint_status, status); | |
427 | DBG("Delete flag set to metadata stream %d", stream->wait_fd); | |
428 | } | |
429 | } | |
430 | ||
431 | /* Follow up by the data streams */ | |
432 | cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) { | |
433 | if (stream->net_seq_idx == net_seq_idx) { | |
434 | uatomic_set(&stream->endpoint_status, status); | |
435 | DBG("Delete flag set to data stream %d", stream->wait_fd); | |
436 | } | |
437 | } | |
438 | rcu_read_unlock(); | |
439 | } | |
440 | ||
441 | /* | |
442 | * Cleanup a relayd object by flagging every associated streams for deletion, | |
443 | * destroying the object meaning removing it from the relayd hash table, | |
444 | * closing the sockets and freeing the memory in a RCU call. | |
445 | * | |
446 | * If a local data context is available, notify the threads that the streams' | |
447 | * state have changed. | |
448 | */ | |
449 | static void cleanup_relayd(struct consumer_relayd_sock_pair *relayd, | |
450 | struct lttng_consumer_local_data *ctx) | |
451 | { | |
da009f2c | 452 | uint64_t netidx; |
8994307f DG |
453 | |
454 | assert(relayd); | |
455 | ||
9617607b DG |
456 | DBG("Cleaning up relayd sockets"); |
457 | ||
8994307f DG |
458 | /* Save the net sequence index before destroying the object */ |
459 | netidx = relayd->net_seq_idx; | |
460 | ||
461 | /* | |
462 | * Delete the relayd from the relayd hash table, close the sockets and free | |
463 | * the object in a RCU call. | |
464 | */ | |
51230d70 | 465 | consumer_destroy_relayd(relayd); |
8994307f DG |
466 | |
467 | /* Set inactive endpoint to all streams */ | |
468 | update_endpoint_status_by_netidx(netidx, CONSUMER_ENDPOINT_INACTIVE); | |
469 | ||
470 | /* | |
471 | * With a local data context, notify the threads that the streams' state | |
472 | * have changed. The write() action on the pipe acts as an "implicit" | |
473 | * memory barrier ordering the updates of the end point status from the | |
474 | * read of this status which happens AFTER receiving this notify. | |
475 | */ | |
476 | if (ctx) { | |
acdb9057 | 477 | notify_thread_lttng_pipe(ctx->consumer_data_pipe); |
13886d2d | 478 | notify_thread_lttng_pipe(ctx->consumer_metadata_pipe); |
8994307f DG |
479 | } |
480 | } | |
481 | ||
a6ba4fe1 DG |
482 | /* |
483 | * Flag a relayd socket pair for destruction. Destroy it if the refcount | |
484 | * reaches zero. | |
485 | * | |
486 | * RCU read side lock MUST be aquired before calling this function. | |
487 | */ | |
488 | void consumer_flag_relayd_for_destroy(struct consumer_relayd_sock_pair *relayd) | |
489 | { | |
490 | assert(relayd); | |
491 | ||
492 | /* Set destroy flag for this object */ | |
493 | uatomic_set(&relayd->destroy_flag, 1); | |
494 | ||
495 | /* Destroy the relayd if refcount is 0 */ | |
496 | if (uatomic_read(&relayd->refcount) == 0) { | |
51230d70 | 497 | consumer_destroy_relayd(relayd); |
a6ba4fe1 DG |
498 | } |
499 | } | |
500 | ||
3bd1e081 | 501 | /* |
1d1a276c DG |
502 | * Completly destroy stream from every visiable data structure and the given |
503 | * hash table if one. | |
504 | * | |
505 | * One this call returns, the stream object is not longer usable nor visible. | |
3bd1e081 | 506 | */ |
e316aad5 DG |
507 | void consumer_del_stream(struct lttng_consumer_stream *stream, |
508 | struct lttng_ht *ht) | |
3bd1e081 | 509 | { |
1d1a276c | 510 | consumer_stream_destroy(stream, ht); |
3bd1e081 MD |
511 | } |
512 | ||
5ab66908 MD |
513 | /* |
514 | * XXX naming of del vs destroy is all mixed up. | |
515 | */ | |
516 | void consumer_del_stream_for_data(struct lttng_consumer_stream *stream) | |
517 | { | |
518 | consumer_stream_destroy(stream, data_ht); | |
519 | } | |
520 | ||
521 | void consumer_del_stream_for_metadata(struct lttng_consumer_stream *stream) | |
522 | { | |
523 | consumer_stream_destroy(stream, metadata_ht); | |
524 | } | |
525 | ||
d88aee68 DG |
526 | struct lttng_consumer_stream *consumer_allocate_stream(uint64_t channel_key, |
527 | uint64_t stream_key, | |
3bd1e081 | 528 | enum lttng_consumer_stream_state state, |
ffe60014 | 529 | const char *channel_name, |
6df2e2c9 | 530 | uid_t uid, |
00e2e675 | 531 | gid_t gid, |
57a269f2 | 532 | uint64_t relayd_id, |
53632229 | 533 | uint64_t session_id, |
ffe60014 DG |
534 | int cpu, |
535 | int *alloc_ret, | |
4891ece8 DG |
536 | enum consumer_channel_type type, |
537 | unsigned int monitor) | |
3bd1e081 | 538 | { |
ffe60014 | 539 | int ret; |
3bd1e081 | 540 | struct lttng_consumer_stream *stream; |
3bd1e081 | 541 | |
effcf122 | 542 | stream = zmalloc(sizeof(*stream)); |
3bd1e081 | 543 | if (stream == NULL) { |
7a57cf92 | 544 | PERROR("malloc struct lttng_consumer_stream"); |
ffe60014 | 545 | ret = -ENOMEM; |
7a57cf92 | 546 | goto end; |
3bd1e081 | 547 | } |
7a57cf92 | 548 | |
d56db448 DG |
549 | rcu_read_lock(); |
550 | ||
3bd1e081 | 551 | stream->key = stream_key; |
3bd1e081 MD |
552 | stream->out_fd = -1; |
553 | stream->out_fd_offset = 0; | |
e5d1a9b3 | 554 | stream->output_written = 0; |
3bd1e081 | 555 | stream->state = state; |
6df2e2c9 MD |
556 | stream->uid = uid; |
557 | stream->gid = gid; | |
ffe60014 | 558 | stream->net_seq_idx = relayd_id; |
53632229 | 559 | stream->session_id = session_id; |
4891ece8 | 560 | stream->monitor = monitor; |
774d490c | 561 | stream->endpoint_status = CONSUMER_ENDPOINT_ACTIVE; |
309167d2 | 562 | stream->index_fd = -1; |
53632229 | 563 | pthread_mutex_init(&stream->lock, NULL); |
58b1f425 | 564 | |
ffe60014 DG |
565 | /* If channel is the metadata, flag this stream as metadata. */ |
566 | if (type == CONSUMER_CHANNEL_TYPE_METADATA) { | |
567 | stream->metadata_flag = 1; | |
568 | /* Metadata is flat out. */ | |
569 | strncpy(stream->name, DEFAULT_METADATA_NAME, sizeof(stream->name)); | |
94d49140 JD |
570 | /* Live rendez-vous point. */ |
571 | pthread_cond_init(&stream->metadata_rdv, NULL); | |
572 | pthread_mutex_init(&stream->metadata_rdv_lock, NULL); | |
58b1f425 | 573 | } else { |
ffe60014 DG |
574 | /* Format stream name to <channel_name>_<cpu_number> */ |
575 | ret = snprintf(stream->name, sizeof(stream->name), "%s_%d", | |
576 | channel_name, cpu); | |
577 | if (ret < 0) { | |
578 | PERROR("snprintf stream name"); | |
579 | goto error; | |
580 | } | |
58b1f425 | 581 | } |
c30aaa51 | 582 | |
ffe60014 | 583 | /* Key is always the wait_fd for streams. */ |
d88aee68 | 584 | lttng_ht_node_init_u64(&stream->node, stream->key); |
ffe60014 | 585 | |
d8ef542d MD |
586 | /* Init node per channel id key */ |
587 | lttng_ht_node_init_u64(&stream->node_channel_id, channel_key); | |
588 | ||
53632229 | 589 | /* Init session id node with the stream session id */ |
d88aee68 | 590 | lttng_ht_node_init_u64(&stream->node_session_id, stream->session_id); |
53632229 | 591 | |
07b86b52 JD |
592 | DBG3("Allocated stream %s (key %" PRIu64 ", chan_key %" PRIu64 |
593 | " relayd_id %" PRIu64 ", session_id %" PRIu64, | |
594 | stream->name, stream->key, channel_key, | |
595 | stream->net_seq_idx, stream->session_id); | |
d56db448 DG |
596 | |
597 | rcu_read_unlock(); | |
3bd1e081 | 598 | return stream; |
c80048c6 MD |
599 | |
600 | error: | |
d56db448 | 601 | rcu_read_unlock(); |
c80048c6 | 602 | free(stream); |
7a57cf92 | 603 | end: |
ffe60014 DG |
604 | if (alloc_ret) { |
605 | *alloc_ret = ret; | |
606 | } | |
c80048c6 | 607 | return NULL; |
3bd1e081 MD |
608 | } |
609 | ||
610 | /* | |
611 | * Add a stream to the global list protected by a mutex. | |
612 | */ | |
5ab66908 | 613 | int consumer_add_data_stream(struct lttng_consumer_stream *stream) |
3bd1e081 | 614 | { |
5ab66908 | 615 | struct lttng_ht *ht = data_ht; |
3bd1e081 MD |
616 | int ret = 0; |
617 | ||
e316aad5 | 618 | assert(stream); |
43c34bc3 | 619 | assert(ht); |
c77fc10a | 620 | |
d88aee68 | 621 | DBG3("Adding consumer stream %" PRIu64, stream->key); |
e316aad5 DG |
622 | |
623 | pthread_mutex_lock(&consumer_data.lock); | |
a9838785 | 624 | pthread_mutex_lock(&stream->chan->lock); |
ec6ea7d0 | 625 | pthread_mutex_lock(&stream->chan->timer_lock); |
2e818a6a | 626 | pthread_mutex_lock(&stream->lock); |
b0b335c8 | 627 | rcu_read_lock(); |
e316aad5 | 628 | |
43c34bc3 | 629 | /* Steal stream identifier to avoid having streams with the same key */ |
ffe60014 | 630 | steal_stream_key(stream->key, ht); |
43c34bc3 | 631 | |
d88aee68 | 632 | lttng_ht_add_unique_u64(ht, &stream->node); |
00e2e675 | 633 | |
d8ef542d MD |
634 | lttng_ht_add_u64(consumer_data.stream_per_chan_id_ht, |
635 | &stream->node_channel_id); | |
636 | ||
ca22feea DG |
637 | /* |
638 | * Add stream to the stream_list_ht of the consumer data. No need to steal | |
639 | * the key since the HT does not use it and we allow to add redundant keys | |
640 | * into this table. | |
641 | */ | |
d88aee68 | 642 | lttng_ht_add_u64(consumer_data.stream_list_ht, &stream->node_session_id); |
ca22feea | 643 | |
e316aad5 | 644 | /* |
ffe60014 DG |
645 | * When nb_init_stream_left reaches 0, we don't need to trigger any action |
646 | * in terms of destroying the associated channel, because the action that | |
e316aad5 DG |
647 | * causes the count to become 0 also causes a stream to be added. The |
648 | * channel deletion will thus be triggered by the following removal of this | |
649 | * stream. | |
650 | */ | |
ffe60014 | 651 | if (uatomic_read(&stream->chan->nb_init_stream_left) > 0) { |
f2ad556d MD |
652 | /* Increment refcount before decrementing nb_init_stream_left */ |
653 | cmm_smp_wmb(); | |
ffe60014 | 654 | uatomic_dec(&stream->chan->nb_init_stream_left); |
e316aad5 DG |
655 | } |
656 | ||
657 | /* Update consumer data once the node is inserted. */ | |
3bd1e081 MD |
658 | consumer_data.stream_count++; |
659 | consumer_data.need_update = 1; | |
660 | ||
e316aad5 | 661 | rcu_read_unlock(); |
2e818a6a | 662 | pthread_mutex_unlock(&stream->lock); |
ec6ea7d0 | 663 | pthread_mutex_unlock(&stream->chan->timer_lock); |
a9838785 | 664 | pthread_mutex_unlock(&stream->chan->lock); |
3bd1e081 | 665 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 666 | |
3bd1e081 MD |
667 | return ret; |
668 | } | |
669 | ||
5ab66908 MD |
670 | void consumer_del_data_stream(struct lttng_consumer_stream *stream) |
671 | { | |
672 | consumer_del_stream(stream, data_ht); | |
673 | } | |
674 | ||
00e2e675 | 675 | /* |
3f8e211f DG |
676 | * Add relayd socket to global consumer data hashtable. RCU read side lock MUST |
677 | * be acquired before calling this. | |
00e2e675 | 678 | */ |
d09e1200 | 679 | static int add_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
680 | { |
681 | int ret = 0; | |
d88aee68 | 682 | struct lttng_ht_node_u64 *node; |
00e2e675 DG |
683 | struct lttng_ht_iter iter; |
684 | ||
ffe60014 | 685 | assert(relayd); |
00e2e675 | 686 | |
00e2e675 | 687 | lttng_ht_lookup(consumer_data.relayd_ht, |
d88aee68 DG |
688 | &relayd->net_seq_idx, &iter); |
689 | node = lttng_ht_iter_get_node_u64(&iter); | |
00e2e675 | 690 | if (node != NULL) { |
00e2e675 DG |
691 | goto end; |
692 | } | |
d88aee68 | 693 | lttng_ht_add_unique_u64(consumer_data.relayd_ht, &relayd->node); |
00e2e675 | 694 | |
00e2e675 DG |
695 | end: |
696 | return ret; | |
697 | } | |
698 | ||
699 | /* | |
700 | * Allocate and return a consumer relayd socket. | |
701 | */ | |
702 | struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair( | |
da009f2c | 703 | uint64_t net_seq_idx) |
00e2e675 DG |
704 | { |
705 | struct consumer_relayd_sock_pair *obj = NULL; | |
706 | ||
da009f2c MD |
707 | /* net sequence index of -1 is a failure */ |
708 | if (net_seq_idx == (uint64_t) -1ULL) { | |
00e2e675 DG |
709 | goto error; |
710 | } | |
711 | ||
712 | obj = zmalloc(sizeof(struct consumer_relayd_sock_pair)); | |
713 | if (obj == NULL) { | |
714 | PERROR("zmalloc relayd sock"); | |
715 | goto error; | |
716 | } | |
717 | ||
718 | obj->net_seq_idx = net_seq_idx; | |
719 | obj->refcount = 0; | |
173af62f | 720 | obj->destroy_flag = 0; |
f96e4545 MD |
721 | obj->control_sock.sock.fd = -1; |
722 | obj->data_sock.sock.fd = -1; | |
d88aee68 | 723 | lttng_ht_node_init_u64(&obj->node, obj->net_seq_idx); |
00e2e675 DG |
724 | pthread_mutex_init(&obj->ctrl_sock_mutex, NULL); |
725 | ||
726 | error: | |
727 | return obj; | |
728 | } | |
729 | ||
730 | /* | |
731 | * Find a relayd socket pair in the global consumer data. | |
732 | * | |
733 | * Return the object if found else NULL. | |
b0b335c8 MD |
734 | * RCU read-side lock must be held across this call and while using the |
735 | * returned object. | |
00e2e675 | 736 | */ |
d88aee68 | 737 | struct consumer_relayd_sock_pair *consumer_find_relayd(uint64_t key) |
00e2e675 DG |
738 | { |
739 | struct lttng_ht_iter iter; | |
d88aee68 | 740 | struct lttng_ht_node_u64 *node; |
00e2e675 DG |
741 | struct consumer_relayd_sock_pair *relayd = NULL; |
742 | ||
743 | /* Negative keys are lookup failures */ | |
d88aee68 | 744 | if (key == (uint64_t) -1ULL) { |
00e2e675 DG |
745 | goto error; |
746 | } | |
747 | ||
d88aee68 | 748 | lttng_ht_lookup(consumer_data.relayd_ht, &key, |
00e2e675 | 749 | &iter); |
d88aee68 | 750 | node = lttng_ht_iter_get_node_u64(&iter); |
00e2e675 DG |
751 | if (node != NULL) { |
752 | relayd = caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
753 | } | |
754 | ||
00e2e675 DG |
755 | error: |
756 | return relayd; | |
757 | } | |
758 | ||
10a50311 JD |
759 | /* |
760 | * Find a relayd and send the stream | |
761 | * | |
762 | * Returns 0 on success, < 0 on error | |
763 | */ | |
764 | int consumer_send_relayd_stream(struct lttng_consumer_stream *stream, | |
765 | char *path) | |
766 | { | |
767 | int ret = 0; | |
768 | struct consumer_relayd_sock_pair *relayd; | |
769 | ||
770 | assert(stream); | |
771 | assert(stream->net_seq_idx != -1ULL); | |
772 | assert(path); | |
773 | ||
774 | /* The stream is not metadata. Get relayd reference if exists. */ | |
775 | rcu_read_lock(); | |
776 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
777 | if (relayd != NULL) { | |
778 | /* Add stream on the relayd */ | |
779 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
780 | ret = relayd_add_stream(&relayd->control_sock, stream->name, | |
781 | path, &stream->relayd_stream_id, | |
782 | stream->chan->tracefile_size, stream->chan->tracefile_count); | |
783 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
784 | if (ret < 0) { | |
785 | goto end; | |
786 | } | |
1c20f0e2 | 787 | |
10a50311 | 788 | uatomic_inc(&relayd->refcount); |
d01178b6 | 789 | stream->sent_to_relayd = 1; |
10a50311 JD |
790 | } else { |
791 | ERR("Stream %" PRIu64 " relayd ID %" PRIu64 " unknown. Can't send it.", | |
792 | stream->key, stream->net_seq_idx); | |
793 | ret = -1; | |
794 | goto end; | |
795 | } | |
796 | ||
797 | DBG("Stream %s with key %" PRIu64 " sent to relayd id %" PRIu64, | |
798 | stream->name, stream->key, stream->net_seq_idx); | |
799 | ||
800 | end: | |
801 | rcu_read_unlock(); | |
802 | return ret; | |
803 | } | |
804 | ||
a4baae1b JD |
805 | /* |
806 | * Find a relayd and send the streams sent message | |
807 | * | |
808 | * Returns 0 on success, < 0 on error | |
809 | */ | |
810 | int consumer_send_relayd_streams_sent(uint64_t net_seq_idx) | |
811 | { | |
812 | int ret = 0; | |
813 | struct consumer_relayd_sock_pair *relayd; | |
814 | ||
815 | assert(net_seq_idx != -1ULL); | |
816 | ||
817 | /* The stream is not metadata. Get relayd reference if exists. */ | |
818 | rcu_read_lock(); | |
819 | relayd = consumer_find_relayd(net_seq_idx); | |
820 | if (relayd != NULL) { | |
821 | /* Add stream on the relayd */ | |
822 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
823 | ret = relayd_streams_sent(&relayd->control_sock); | |
824 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
825 | if (ret < 0) { | |
826 | goto end; | |
827 | } | |
828 | } else { | |
829 | ERR("Relayd ID %" PRIu64 " unknown. Can't send streams_sent.", | |
830 | net_seq_idx); | |
831 | ret = -1; | |
832 | goto end; | |
833 | } | |
834 | ||
835 | ret = 0; | |
836 | DBG("All streams sent relayd id %" PRIu64, net_seq_idx); | |
837 | ||
838 | end: | |
839 | rcu_read_unlock(); | |
840 | return ret; | |
841 | } | |
842 | ||
10a50311 JD |
843 | /* |
844 | * Find a relayd and close the stream | |
845 | */ | |
846 | void close_relayd_stream(struct lttng_consumer_stream *stream) | |
847 | { | |
848 | struct consumer_relayd_sock_pair *relayd; | |
849 | ||
850 | /* The stream is not metadata. Get relayd reference if exists. */ | |
851 | rcu_read_lock(); | |
852 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
853 | if (relayd) { | |
854 | consumer_stream_relayd_close(stream, relayd); | |
855 | } | |
856 | rcu_read_unlock(); | |
857 | } | |
858 | ||
00e2e675 DG |
859 | /* |
860 | * Handle stream for relayd transmission if the stream applies for network | |
861 | * streaming where the net sequence index is set. | |
862 | * | |
863 | * Return destination file descriptor or negative value on error. | |
864 | */ | |
6197aea7 | 865 | static int write_relayd_stream_header(struct lttng_consumer_stream *stream, |
1d4dfdef DG |
866 | size_t data_size, unsigned long padding, |
867 | struct consumer_relayd_sock_pair *relayd) | |
00e2e675 DG |
868 | { |
869 | int outfd = -1, ret; | |
00e2e675 DG |
870 | struct lttcomm_relayd_data_hdr data_hdr; |
871 | ||
872 | /* Safety net */ | |
873 | assert(stream); | |
6197aea7 | 874 | assert(relayd); |
00e2e675 DG |
875 | |
876 | /* Reset data header */ | |
877 | memset(&data_hdr, 0, sizeof(data_hdr)); | |
878 | ||
00e2e675 DG |
879 | if (stream->metadata_flag) { |
880 | /* Caller MUST acquire the relayd control socket lock */ | |
881 | ret = relayd_send_metadata(&relayd->control_sock, data_size); | |
882 | if (ret < 0) { | |
883 | goto error; | |
884 | } | |
885 | ||
886 | /* Metadata are always sent on the control socket. */ | |
6151a90f | 887 | outfd = relayd->control_sock.sock.fd; |
00e2e675 DG |
888 | } else { |
889 | /* Set header with stream information */ | |
890 | data_hdr.stream_id = htobe64(stream->relayd_stream_id); | |
891 | data_hdr.data_size = htobe32(data_size); | |
1d4dfdef | 892 | data_hdr.padding_size = htobe32(padding); |
39df6d9f DG |
893 | /* |
894 | * Note that net_seq_num below is assigned with the *current* value of | |
895 | * next_net_seq_num and only after that the next_net_seq_num will be | |
896 | * increment. This is why when issuing a command on the relayd using | |
897 | * this next value, 1 should always be substracted in order to compare | |
898 | * the last seen sequence number on the relayd side to the last sent. | |
899 | */ | |
3604f373 | 900 | data_hdr.net_seq_num = htobe64(stream->next_net_seq_num); |
00e2e675 DG |
901 | /* Other fields are zeroed previously */ |
902 | ||
903 | ret = relayd_send_data_hdr(&relayd->data_sock, &data_hdr, | |
904 | sizeof(data_hdr)); | |
905 | if (ret < 0) { | |
906 | goto error; | |
907 | } | |
908 | ||
3604f373 DG |
909 | ++stream->next_net_seq_num; |
910 | ||
00e2e675 | 911 | /* Set to go on data socket */ |
6151a90f | 912 | outfd = relayd->data_sock.sock.fd; |
00e2e675 DG |
913 | } |
914 | ||
915 | error: | |
916 | return outfd; | |
917 | } | |
918 | ||
3bd1e081 | 919 | /* |
ffe60014 DG |
920 | * Allocate and return a new lttng_consumer_channel object using the given key |
921 | * to initialize the hash table node. | |
922 | * | |
923 | * On error, return NULL. | |
3bd1e081 | 924 | */ |
886224ff | 925 | struct lttng_consumer_channel *consumer_allocate_channel(uint64_t key, |
ffe60014 DG |
926 | uint64_t session_id, |
927 | const char *pathname, | |
928 | const char *name, | |
929 | uid_t uid, | |
930 | gid_t gid, | |
57a269f2 | 931 | uint64_t relayd_id, |
1624d5b7 JD |
932 | enum lttng_event_output output, |
933 | uint64_t tracefile_size, | |
2bba9e53 | 934 | uint64_t tracefile_count, |
1950109e | 935 | uint64_t session_id_per_pid, |
ecc48a90 JD |
936 | unsigned int monitor, |
937 | unsigned int live_timer_interval) | |
3bd1e081 MD |
938 | { |
939 | struct lttng_consumer_channel *channel; | |
3bd1e081 | 940 | |
276b26d1 | 941 | channel = zmalloc(sizeof(*channel)); |
3bd1e081 | 942 | if (channel == NULL) { |
7a57cf92 | 943 | PERROR("malloc struct lttng_consumer_channel"); |
3bd1e081 MD |
944 | goto end; |
945 | } | |
ffe60014 DG |
946 | |
947 | channel->key = key; | |
3bd1e081 | 948 | channel->refcount = 0; |
ffe60014 | 949 | channel->session_id = session_id; |
1950109e | 950 | channel->session_id_per_pid = session_id_per_pid; |
ffe60014 DG |
951 | channel->uid = uid; |
952 | channel->gid = gid; | |
953 | channel->relayd_id = relayd_id; | |
1624d5b7 JD |
954 | channel->tracefile_size = tracefile_size; |
955 | channel->tracefile_count = tracefile_count; | |
2bba9e53 | 956 | channel->monitor = monitor; |
ecc48a90 | 957 | channel->live_timer_interval = live_timer_interval; |
a9838785 | 958 | pthread_mutex_init(&channel->lock, NULL); |
ec6ea7d0 | 959 | pthread_mutex_init(&channel->timer_lock, NULL); |
ffe60014 | 960 | |
0c759fc9 DG |
961 | switch (output) { |
962 | case LTTNG_EVENT_SPLICE: | |
963 | channel->output = CONSUMER_CHANNEL_SPLICE; | |
964 | break; | |
965 | case LTTNG_EVENT_MMAP: | |
966 | channel->output = CONSUMER_CHANNEL_MMAP; | |
967 | break; | |
968 | default: | |
969 | assert(0); | |
970 | free(channel); | |
971 | channel = NULL; | |
972 | goto end; | |
973 | } | |
974 | ||
07b86b52 JD |
975 | /* |
976 | * In monitor mode, the streams associated with the channel will be put in | |
977 | * a special list ONLY owned by this channel. So, the refcount is set to 1 | |
978 | * here meaning that the channel itself has streams that are referenced. | |
979 | * | |
980 | * On a channel deletion, once the channel is no longer visible, the | |
981 | * refcount is decremented and checked for a zero value to delete it. With | |
982 | * streams in no monitor mode, it will now be safe to destroy the channel. | |
983 | */ | |
984 | if (!channel->monitor) { | |
985 | channel->refcount = 1; | |
986 | } | |
987 | ||
ffe60014 DG |
988 | strncpy(channel->pathname, pathname, sizeof(channel->pathname)); |
989 | channel->pathname[sizeof(channel->pathname) - 1] = '\0'; | |
990 | ||
991 | strncpy(channel->name, name, sizeof(channel->name)); | |
992 | channel->name[sizeof(channel->name) - 1] = '\0'; | |
993 | ||
d88aee68 | 994 | lttng_ht_node_init_u64(&channel->node, channel->key); |
d8ef542d MD |
995 | |
996 | channel->wait_fd = -1; | |
997 | ||
ffe60014 DG |
998 | CDS_INIT_LIST_HEAD(&channel->streams.head); |
999 | ||
d88aee68 | 1000 | DBG("Allocated channel (key %" PRIu64 ")", channel->key) |
3bd1e081 | 1001 | |
3bd1e081 MD |
1002 | end: |
1003 | return channel; | |
1004 | } | |
1005 | ||
1006 | /* | |
1007 | * Add a channel to the global list protected by a mutex. | |
821fffb2 | 1008 | * |
b5a6470f | 1009 | * Always return 0 indicating success. |
3bd1e081 | 1010 | */ |
d8ef542d MD |
1011 | int consumer_add_channel(struct lttng_consumer_channel *channel, |
1012 | struct lttng_consumer_local_data *ctx) | |
3bd1e081 | 1013 | { |
3bd1e081 | 1014 | pthread_mutex_lock(&consumer_data.lock); |
a9838785 | 1015 | pthread_mutex_lock(&channel->lock); |
ec6ea7d0 | 1016 | pthread_mutex_lock(&channel->timer_lock); |
c77fc10a | 1017 | |
b5a6470f DG |
1018 | /* |
1019 | * This gives us a guarantee that the channel we are about to add to the | |
1020 | * channel hash table will be unique. See this function comment on the why | |
1021 | * we need to steel the channel key at this stage. | |
1022 | */ | |
1023 | steal_channel_key(channel->key); | |
c77fc10a | 1024 | |
b5a6470f | 1025 | rcu_read_lock(); |
d88aee68 | 1026 | lttng_ht_add_unique_u64(consumer_data.channel_ht, &channel->node); |
6065ceec | 1027 | rcu_read_unlock(); |
b5a6470f | 1028 | |
ec6ea7d0 | 1029 | pthread_mutex_unlock(&channel->timer_lock); |
a9838785 | 1030 | pthread_mutex_unlock(&channel->lock); |
3bd1e081 | 1031 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 1032 | |
b5a6470f | 1033 | if (channel->wait_fd != -1 && channel->type == CONSUMER_CHANNEL_TYPE_DATA) { |
a0cbdd2e | 1034 | notify_channel_pipe(ctx, channel, -1, CONSUMER_CHANNEL_ADD); |
d8ef542d | 1035 | } |
b5a6470f DG |
1036 | |
1037 | return 0; | |
3bd1e081 MD |
1038 | } |
1039 | ||
1040 | /* | |
1041 | * Allocate the pollfd structure and the local view of the out fds to avoid | |
1042 | * doing a lookup in the linked list and concurrency issues when writing is | |
1043 | * needed. Called with consumer_data.lock held. | |
1044 | * | |
1045 | * Returns the number of fds in the structures. | |
1046 | */ | |
ffe60014 DG |
1047 | static int update_poll_array(struct lttng_consumer_local_data *ctx, |
1048 | struct pollfd **pollfd, struct lttng_consumer_stream **local_stream, | |
1049 | struct lttng_ht *ht) | |
3bd1e081 | 1050 | { |
3bd1e081 | 1051 | int i = 0; |
e4421fec DG |
1052 | struct lttng_ht_iter iter; |
1053 | struct lttng_consumer_stream *stream; | |
3bd1e081 | 1054 | |
ffe60014 DG |
1055 | assert(ctx); |
1056 | assert(ht); | |
1057 | assert(pollfd); | |
1058 | assert(local_stream); | |
1059 | ||
3bd1e081 | 1060 | DBG("Updating poll fd array"); |
481d6c57 | 1061 | rcu_read_lock(); |
43c34bc3 | 1062 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { |
8994307f DG |
1063 | /* |
1064 | * Only active streams with an active end point can be added to the | |
1065 | * poll set and local stream storage of the thread. | |
1066 | * | |
1067 | * There is a potential race here for endpoint_status to be updated | |
1068 | * just after the check. However, this is OK since the stream(s) will | |
1069 | * be deleted once the thread is notified that the end point state has | |
1070 | * changed where this function will be called back again. | |
1071 | */ | |
1072 | if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM || | |
79d4ffb7 | 1073 | stream->endpoint_status == CONSUMER_ENDPOINT_INACTIVE) { |
3bd1e081 MD |
1074 | continue; |
1075 | } | |
7972aab2 DG |
1076 | /* |
1077 | * This clobbers way too much the debug output. Uncomment that if you | |
1078 | * need it for debugging purposes. | |
1079 | * | |
1080 | * DBG("Active FD %d", stream->wait_fd); | |
1081 | */ | |
e4421fec | 1082 | (*pollfd)[i].fd = stream->wait_fd; |
3bd1e081 | 1083 | (*pollfd)[i].events = POLLIN | POLLPRI; |
e4421fec | 1084 | local_stream[i] = stream; |
3bd1e081 MD |
1085 | i++; |
1086 | } | |
481d6c57 | 1087 | rcu_read_unlock(); |
3bd1e081 MD |
1088 | |
1089 | /* | |
50f8ae69 | 1090 | * Insert the consumer_data_pipe at the end of the array and don't |
3bd1e081 MD |
1091 | * increment i so nb_fd is the number of real FD. |
1092 | */ | |
acdb9057 | 1093 | (*pollfd)[i].fd = lttng_pipe_get_readfd(ctx->consumer_data_pipe); |
509bb1cf | 1094 | (*pollfd)[i].events = POLLIN | POLLPRI; |
02b3d176 DG |
1095 | |
1096 | (*pollfd)[i + 1].fd = lttng_pipe_get_readfd(ctx->consumer_wakeup_pipe); | |
1097 | (*pollfd)[i + 1].events = POLLIN | POLLPRI; | |
3bd1e081 MD |
1098 | return i; |
1099 | } | |
1100 | ||
1101 | /* | |
84382d49 MD |
1102 | * Poll on the should_quit pipe and the command socket return -1 on |
1103 | * error, 1 if should exit, 0 if data is available on the command socket | |
3bd1e081 MD |
1104 | */ |
1105 | int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll) | |
1106 | { | |
1107 | int num_rdy; | |
1108 | ||
88f2b785 | 1109 | restart: |
3bd1e081 MD |
1110 | num_rdy = poll(consumer_sockpoll, 2, -1); |
1111 | if (num_rdy == -1) { | |
88f2b785 MD |
1112 | /* |
1113 | * Restart interrupted system call. | |
1114 | */ | |
1115 | if (errno == EINTR) { | |
1116 | goto restart; | |
1117 | } | |
7a57cf92 | 1118 | PERROR("Poll error"); |
84382d49 | 1119 | return -1; |
3bd1e081 | 1120 | } |
509bb1cf | 1121 | if (consumer_sockpoll[0].revents & (POLLIN | POLLPRI)) { |
3bd1e081 | 1122 | DBG("consumer_should_quit wake up"); |
84382d49 | 1123 | return 1; |
3bd1e081 MD |
1124 | } |
1125 | return 0; | |
3bd1e081 MD |
1126 | } |
1127 | ||
1128 | /* | |
1129 | * Set the error socket. | |
1130 | */ | |
ffe60014 DG |
1131 | void lttng_consumer_set_error_sock(struct lttng_consumer_local_data *ctx, |
1132 | int sock) | |
3bd1e081 MD |
1133 | { |
1134 | ctx->consumer_error_socket = sock; | |
1135 | } | |
1136 | ||
1137 | /* | |
1138 | * Set the command socket path. | |
1139 | */ | |
3bd1e081 MD |
1140 | void lttng_consumer_set_command_sock_path( |
1141 | struct lttng_consumer_local_data *ctx, char *sock) | |
1142 | { | |
1143 | ctx->consumer_command_sock_path = sock; | |
1144 | } | |
1145 | ||
1146 | /* | |
1147 | * Send return code to the session daemon. | |
1148 | * If the socket is not defined, we return 0, it is not a fatal error | |
1149 | */ | |
ffe60014 | 1150 | int lttng_consumer_send_error(struct lttng_consumer_local_data *ctx, int cmd) |
3bd1e081 MD |
1151 | { |
1152 | if (ctx->consumer_error_socket > 0) { | |
1153 | return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd, | |
1154 | sizeof(enum lttcomm_sessiond_command)); | |
1155 | } | |
1156 | ||
1157 | return 0; | |
1158 | } | |
1159 | ||
1160 | /* | |
228b5bf7 DG |
1161 | * Close all the tracefiles and stream fds and MUST be called when all |
1162 | * instances are destroyed i.e. when all threads were joined and are ended. | |
3bd1e081 MD |
1163 | */ |
1164 | void lttng_consumer_cleanup(void) | |
1165 | { | |
e4421fec | 1166 | struct lttng_ht_iter iter; |
ffe60014 | 1167 | struct lttng_consumer_channel *channel; |
6065ceec DG |
1168 | |
1169 | rcu_read_lock(); | |
3bd1e081 | 1170 | |
ffe60014 DG |
1171 | cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, channel, |
1172 | node.node) { | |
702b1ea4 | 1173 | consumer_del_channel(channel); |
3bd1e081 | 1174 | } |
6065ceec DG |
1175 | |
1176 | rcu_read_unlock(); | |
d6ce1df2 | 1177 | |
d6ce1df2 | 1178 | lttng_ht_destroy(consumer_data.channel_ht); |
228b5bf7 DG |
1179 | |
1180 | cleanup_relayd_ht(); | |
1181 | ||
d8ef542d MD |
1182 | lttng_ht_destroy(consumer_data.stream_per_chan_id_ht); |
1183 | ||
228b5bf7 DG |
1184 | /* |
1185 | * This HT contains streams that are freed by either the metadata thread or | |
1186 | * the data thread so we do *nothing* on the hash table and simply destroy | |
1187 | * it. | |
1188 | */ | |
1189 | lttng_ht_destroy(consumer_data.stream_list_ht); | |
3bd1e081 MD |
1190 | } |
1191 | ||
1192 | /* | |
1193 | * Called from signal handler. | |
1194 | */ | |
1195 | void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx) | |
1196 | { | |
6cd525e8 MD |
1197 | ssize_t ret; |
1198 | ||
3bd1e081 | 1199 | consumer_quit = 1; |
6cd525e8 MD |
1200 | ret = lttng_write(ctx->consumer_should_quit[1], "4", 1); |
1201 | if (ret < 1) { | |
7a57cf92 | 1202 | PERROR("write consumer quit"); |
3bd1e081 | 1203 | } |
ab1027f4 DG |
1204 | |
1205 | DBG("Consumer flag that it should quit"); | |
3bd1e081 MD |
1206 | } |
1207 | ||
00e2e675 DG |
1208 | void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream, |
1209 | off_t orig_offset) | |
3bd1e081 MD |
1210 | { |
1211 | int outfd = stream->out_fd; | |
1212 | ||
1213 | /* | |
1214 | * This does a blocking write-and-wait on any page that belongs to the | |
1215 | * subbuffer prior to the one we just wrote. | |
1216 | * Don't care about error values, as these are just hints and ways to | |
1217 | * limit the amount of page cache used. | |
1218 | */ | |
ffe60014 | 1219 | if (orig_offset < stream->max_sb_size) { |
3bd1e081 MD |
1220 | return; |
1221 | } | |
ffe60014 DG |
1222 | lttng_sync_file_range(outfd, orig_offset - stream->max_sb_size, |
1223 | stream->max_sb_size, | |
3bd1e081 MD |
1224 | SYNC_FILE_RANGE_WAIT_BEFORE |
1225 | | SYNC_FILE_RANGE_WRITE | |
1226 | | SYNC_FILE_RANGE_WAIT_AFTER); | |
1227 | /* | |
1228 | * Give hints to the kernel about how we access the file: | |
1229 | * POSIX_FADV_DONTNEED : we won't re-access data in a near future after | |
1230 | * we write it. | |
1231 | * | |
1232 | * We need to call fadvise again after the file grows because the | |
1233 | * kernel does not seem to apply fadvise to non-existing parts of the | |
1234 | * file. | |
1235 | * | |
1236 | * Call fadvise _after_ having waited for the page writeback to | |
1237 | * complete because the dirty page writeback semantic is not well | |
1238 | * defined. So it can be expected to lead to lower throughput in | |
1239 | * streaming. | |
1240 | */ | |
ffe60014 DG |
1241 | posix_fadvise(outfd, orig_offset - stream->max_sb_size, |
1242 | stream->max_sb_size, POSIX_FADV_DONTNEED); | |
3bd1e081 MD |
1243 | } |
1244 | ||
1245 | /* | |
1246 | * Initialise the necessary environnement : | |
1247 | * - create a new context | |
1248 | * - create the poll_pipe | |
1249 | * - create the should_quit pipe (for signal handler) | |
1250 | * - create the thread pipe (for splice) | |
1251 | * | |
1252 | * Takes a function pointer as argument, this function is called when data is | |
1253 | * available on a buffer. This function is responsible to do the | |
1254 | * kernctl_get_next_subbuf, read the data with mmap or splice depending on the | |
1255 | * buffer configuration and then kernctl_put_next_subbuf at the end. | |
1256 | * | |
1257 | * Returns a pointer to the new context or NULL on error. | |
1258 | */ | |
1259 | struct lttng_consumer_local_data *lttng_consumer_create( | |
1260 | enum lttng_consumer_type type, | |
4078b776 | 1261 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
d41f73b7 | 1262 | struct lttng_consumer_local_data *ctx), |
3bd1e081 MD |
1263 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
1264 | int (*recv_stream)(struct lttng_consumer_stream *stream), | |
30319bcb | 1265 | int (*update_stream)(uint64_t stream_key, uint32_t state)) |
3bd1e081 | 1266 | { |
d8ef542d | 1267 | int ret; |
3bd1e081 MD |
1268 | struct lttng_consumer_local_data *ctx; |
1269 | ||
1270 | assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN || | |
1271 | consumer_data.type == type); | |
1272 | consumer_data.type = type; | |
1273 | ||
effcf122 | 1274 | ctx = zmalloc(sizeof(struct lttng_consumer_local_data)); |
3bd1e081 | 1275 | if (ctx == NULL) { |
7a57cf92 | 1276 | PERROR("allocating context"); |
3bd1e081 MD |
1277 | goto error; |
1278 | } | |
1279 | ||
1280 | ctx->consumer_error_socket = -1; | |
331744e3 | 1281 | ctx->consumer_metadata_socket = -1; |
75d83e50 | 1282 | pthread_mutex_init(&ctx->metadata_socket_lock, NULL); |
3bd1e081 MD |
1283 | /* assign the callbacks */ |
1284 | ctx->on_buffer_ready = buffer_ready; | |
1285 | ctx->on_recv_channel = recv_channel; | |
1286 | ctx->on_recv_stream = recv_stream; | |
1287 | ctx->on_update_stream = update_stream; | |
1288 | ||
acdb9057 DG |
1289 | ctx->consumer_data_pipe = lttng_pipe_open(0); |
1290 | if (!ctx->consumer_data_pipe) { | |
3bd1e081 MD |
1291 | goto error_poll_pipe; |
1292 | } | |
1293 | ||
02b3d176 DG |
1294 | ctx->consumer_wakeup_pipe = lttng_pipe_open(0); |
1295 | if (!ctx->consumer_wakeup_pipe) { | |
1296 | goto error_wakeup_pipe; | |
1297 | } | |
1298 | ||
3bd1e081 MD |
1299 | ret = pipe(ctx->consumer_should_quit); |
1300 | if (ret < 0) { | |
7a57cf92 | 1301 | PERROR("Error creating recv pipe"); |
3bd1e081 MD |
1302 | goto error_quit_pipe; |
1303 | } | |
1304 | ||
d8ef542d MD |
1305 | ret = pipe(ctx->consumer_channel_pipe); |
1306 | if (ret < 0) { | |
1307 | PERROR("Error creating channel pipe"); | |
1308 | goto error_channel_pipe; | |
1309 | } | |
1310 | ||
13886d2d DG |
1311 | ctx->consumer_metadata_pipe = lttng_pipe_open(0); |
1312 | if (!ctx->consumer_metadata_pipe) { | |
fb3a43a9 DG |
1313 | goto error_metadata_pipe; |
1314 | } | |
3bd1e081 | 1315 | |
fb3a43a9 | 1316 | return ctx; |
3bd1e081 | 1317 | |
fb3a43a9 | 1318 | error_metadata_pipe: |
d8ef542d MD |
1319 | utils_close_pipe(ctx->consumer_channel_pipe); |
1320 | error_channel_pipe: | |
d8ef542d | 1321 | utils_close_pipe(ctx->consumer_should_quit); |
3bd1e081 | 1322 | error_quit_pipe: |
02b3d176 DG |
1323 | lttng_pipe_destroy(ctx->consumer_wakeup_pipe); |
1324 | error_wakeup_pipe: | |
acdb9057 | 1325 | lttng_pipe_destroy(ctx->consumer_data_pipe); |
3bd1e081 MD |
1326 | error_poll_pipe: |
1327 | free(ctx); | |
1328 | error: | |
1329 | return NULL; | |
1330 | } | |
1331 | ||
282dadbc MD |
1332 | /* |
1333 | * Iterate over all streams of the hashtable and free them properly. | |
1334 | */ | |
1335 | static void destroy_data_stream_ht(struct lttng_ht *ht) | |
1336 | { | |
1337 | struct lttng_ht_iter iter; | |
1338 | struct lttng_consumer_stream *stream; | |
1339 | ||
1340 | if (ht == NULL) { | |
1341 | return; | |
1342 | } | |
1343 | ||
1344 | rcu_read_lock(); | |
1345 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { | |
1346 | /* | |
1347 | * Ignore return value since we are currently cleaning up so any error | |
1348 | * can't be handled. | |
1349 | */ | |
1350 | (void) consumer_del_stream(stream, ht); | |
1351 | } | |
1352 | rcu_read_unlock(); | |
1353 | ||
1354 | lttng_ht_destroy(ht); | |
1355 | } | |
1356 | ||
1357 | /* | |
1358 | * Iterate over all streams of the metadata hashtable and free them | |
1359 | * properly. | |
1360 | */ | |
1361 | static void destroy_metadata_stream_ht(struct lttng_ht *ht) | |
1362 | { | |
1363 | struct lttng_ht_iter iter; | |
1364 | struct lttng_consumer_stream *stream; | |
1365 | ||
1366 | if (ht == NULL) { | |
1367 | return; | |
1368 | } | |
1369 | ||
1370 | rcu_read_lock(); | |
1371 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { | |
1372 | /* | |
1373 | * Ignore return value since we are currently cleaning up so any error | |
1374 | * can't be handled. | |
1375 | */ | |
1376 | (void) consumer_del_metadata_stream(stream, ht); | |
1377 | } | |
1378 | rcu_read_unlock(); | |
1379 | ||
1380 | lttng_ht_destroy(ht); | |
1381 | } | |
1382 | ||
3bd1e081 MD |
1383 | /* |
1384 | * Close all fds associated with the instance and free the context. | |
1385 | */ | |
1386 | void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx) | |
1387 | { | |
4c462e79 MD |
1388 | int ret; |
1389 | ||
ab1027f4 DG |
1390 | DBG("Consumer destroying it. Closing everything."); |
1391 | ||
4f2e75b9 DG |
1392 | if (!ctx) { |
1393 | return; | |
1394 | } | |
1395 | ||
282dadbc MD |
1396 | destroy_data_stream_ht(data_ht); |
1397 | destroy_metadata_stream_ht(metadata_ht); | |
1398 | ||
4c462e79 MD |
1399 | ret = close(ctx->consumer_error_socket); |
1400 | if (ret) { | |
1401 | PERROR("close"); | |
1402 | } | |
331744e3 JD |
1403 | ret = close(ctx->consumer_metadata_socket); |
1404 | if (ret) { | |
1405 | PERROR("close"); | |
1406 | } | |
d8ef542d | 1407 | utils_close_pipe(ctx->consumer_channel_pipe); |
acdb9057 | 1408 | lttng_pipe_destroy(ctx->consumer_data_pipe); |
13886d2d | 1409 | lttng_pipe_destroy(ctx->consumer_metadata_pipe); |
02b3d176 | 1410 | lttng_pipe_destroy(ctx->consumer_wakeup_pipe); |
d8ef542d | 1411 | utils_close_pipe(ctx->consumer_should_quit); |
fb3a43a9 | 1412 | |
3bd1e081 MD |
1413 | unlink(ctx->consumer_command_sock_path); |
1414 | free(ctx); | |
1415 | } | |
1416 | ||
6197aea7 DG |
1417 | /* |
1418 | * Write the metadata stream id on the specified file descriptor. | |
1419 | */ | |
1420 | static int write_relayd_metadata_id(int fd, | |
1421 | struct lttng_consumer_stream *stream, | |
ffe60014 | 1422 | struct consumer_relayd_sock_pair *relayd, unsigned long padding) |
6197aea7 | 1423 | { |
6cd525e8 | 1424 | ssize_t ret; |
1d4dfdef | 1425 | struct lttcomm_relayd_metadata_payload hdr; |
6197aea7 | 1426 | |
1d4dfdef DG |
1427 | hdr.stream_id = htobe64(stream->relayd_stream_id); |
1428 | hdr.padding_size = htobe32(padding); | |
6cd525e8 MD |
1429 | ret = lttng_write(fd, (void *) &hdr, sizeof(hdr)); |
1430 | if (ret < sizeof(hdr)) { | |
d7b75ec8 DG |
1431 | /* |
1432 | * This error means that the fd's end is closed so ignore the perror | |
1433 | * not to clubber the error output since this can happen in a normal | |
1434 | * code path. | |
1435 | */ | |
1436 | if (errno != EPIPE) { | |
1437 | PERROR("write metadata stream id"); | |
1438 | } | |
1439 | DBG3("Consumer failed to write relayd metadata id (errno: %d)", errno); | |
534d2592 DG |
1440 | /* |
1441 | * Set ret to a negative value because if ret != sizeof(hdr), we don't | |
1442 | * handle writting the missing part so report that as an error and | |
1443 | * don't lie to the caller. | |
1444 | */ | |
1445 | ret = -1; | |
6197aea7 DG |
1446 | goto end; |
1447 | } | |
1d4dfdef DG |
1448 | DBG("Metadata stream id %" PRIu64 " with padding %lu written before data", |
1449 | stream->relayd_stream_id, padding); | |
6197aea7 DG |
1450 | |
1451 | end: | |
6cd525e8 | 1452 | return (int) ret; |
6197aea7 DG |
1453 | } |
1454 | ||
3bd1e081 | 1455 | /* |
09e26845 DG |
1456 | * Mmap the ring buffer, read it and write the data to the tracefile. This is a |
1457 | * core function for writing trace buffers to either the local filesystem or | |
1458 | * the network. | |
1459 | * | |
79d4ffb7 DG |
1460 | * It must be called with the stream lock held. |
1461 | * | |
09e26845 | 1462 | * Careful review MUST be put if any changes occur! |
3bd1e081 MD |
1463 | * |
1464 | * Returns the number of bytes written | |
1465 | */ | |
4078b776 | 1466 | ssize_t lttng_consumer_on_read_subbuffer_mmap( |
3bd1e081 | 1467 | struct lttng_consumer_local_data *ctx, |
1d4dfdef | 1468 | struct lttng_consumer_stream *stream, unsigned long len, |
309167d2 | 1469 | unsigned long padding, |
50adc264 | 1470 | struct ctf_packet_index *index) |
3bd1e081 | 1471 | { |
f02e1e8a | 1472 | unsigned long mmap_offset; |
ffe60014 | 1473 | void *mmap_base; |
994ab360 | 1474 | ssize_t ret = 0; |
f02e1e8a DG |
1475 | off_t orig_offset = stream->out_fd_offset; |
1476 | /* Default is on the disk */ | |
1477 | int outfd = stream->out_fd; | |
f02e1e8a | 1478 | struct consumer_relayd_sock_pair *relayd = NULL; |
8994307f | 1479 | unsigned int relayd_hang_up = 0; |
f02e1e8a DG |
1480 | |
1481 | /* RCU lock for the relayd pointer */ | |
1482 | rcu_read_lock(); | |
1483 | ||
1484 | /* Flag that the current stream if set for network streaming. */ | |
da009f2c | 1485 | if (stream->net_seq_idx != (uint64_t) -1ULL) { |
f02e1e8a DG |
1486 | relayd = consumer_find_relayd(stream->net_seq_idx); |
1487 | if (relayd == NULL) { | |
56591bac | 1488 | ret = -EPIPE; |
f02e1e8a DG |
1489 | goto end; |
1490 | } | |
1491 | } | |
1492 | ||
1493 | /* get the offset inside the fd to mmap */ | |
3bd1e081 MD |
1494 | switch (consumer_data.type) { |
1495 | case LTTNG_CONSUMER_KERNEL: | |
ffe60014 | 1496 | mmap_base = stream->mmap_base; |
f02e1e8a | 1497 | ret = kernctl_get_mmap_read_offset(stream->wait_fd, &mmap_offset); |
994ab360 DG |
1498 | if (ret < 0) { |
1499 | ret = -errno; | |
56591bac | 1500 | PERROR("tracer ctl get_mmap_read_offset"); |
56591bac MD |
1501 | goto end; |
1502 | } | |
f02e1e8a | 1503 | break; |
7753dea8 MD |
1504 | case LTTNG_CONSUMER32_UST: |
1505 | case LTTNG_CONSUMER64_UST: | |
ffe60014 DG |
1506 | mmap_base = lttng_ustctl_get_mmap_base(stream); |
1507 | if (!mmap_base) { | |
1508 | ERR("read mmap get mmap base for stream %s", stream->name); | |
994ab360 | 1509 | ret = -EPERM; |
ffe60014 DG |
1510 | goto end; |
1511 | } | |
1512 | ret = lttng_ustctl_get_mmap_read_offset(stream, &mmap_offset); | |
56591bac MD |
1513 | if (ret != 0) { |
1514 | PERROR("tracer ctl get_mmap_read_offset"); | |
994ab360 | 1515 | ret = -EINVAL; |
56591bac MD |
1516 | goto end; |
1517 | } | |
f02e1e8a | 1518 | break; |
3bd1e081 MD |
1519 | default: |
1520 | ERR("Unknown consumer_data type"); | |
1521 | assert(0); | |
1522 | } | |
b9182dd9 | 1523 | |
f02e1e8a DG |
1524 | /* Handle stream on the relayd if the output is on the network */ |
1525 | if (relayd) { | |
1526 | unsigned long netlen = len; | |
1527 | ||
1528 | /* | |
1529 | * Lock the control socket for the complete duration of the function | |
1530 | * since from this point on we will use the socket. | |
1531 | */ | |
1532 | if (stream->metadata_flag) { | |
1533 | /* Metadata requires the control socket. */ | |
1534 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1d4dfdef | 1535 | netlen += sizeof(struct lttcomm_relayd_metadata_payload); |
f02e1e8a DG |
1536 | } |
1537 | ||
1d4dfdef | 1538 | ret = write_relayd_stream_header(stream, netlen, padding, relayd); |
994ab360 DG |
1539 | if (ret < 0) { |
1540 | relayd_hang_up = 1; | |
1541 | goto write_error; | |
1542 | } | |
1543 | /* Use the returned socket. */ | |
1544 | outfd = ret; | |
f02e1e8a | 1545 | |
994ab360 DG |
1546 | /* Write metadata stream id before payload */ |
1547 | if (stream->metadata_flag) { | |
1548 | ret = write_relayd_metadata_id(outfd, stream, relayd, padding); | |
1549 | if (ret < 0) { | |
8994307f DG |
1550 | relayd_hang_up = 1; |
1551 | goto write_error; | |
1552 | } | |
f02e1e8a | 1553 | } |
1d4dfdef DG |
1554 | } else { |
1555 | /* No streaming, we have to set the len with the full padding */ | |
1556 | len += padding; | |
1624d5b7 JD |
1557 | |
1558 | /* | |
1559 | * Check if we need to change the tracefile before writing the packet. | |
1560 | */ | |
1561 | if (stream->chan->tracefile_size > 0 && | |
1562 | (stream->tracefile_size_current + len) > | |
1563 | stream->chan->tracefile_size) { | |
fe4477ee JD |
1564 | ret = utils_rotate_stream_file(stream->chan->pathname, |
1565 | stream->name, stream->chan->tracefile_size, | |
1566 | stream->chan->tracefile_count, stream->uid, stream->gid, | |
309167d2 JD |
1567 | stream->out_fd, &(stream->tracefile_count_current), |
1568 | &stream->out_fd); | |
1624d5b7 JD |
1569 | if (ret < 0) { |
1570 | ERR("Rotating output file"); | |
1571 | goto end; | |
1572 | } | |
309167d2 JD |
1573 | outfd = stream->out_fd; |
1574 | ||
1575 | if (stream->index_fd >= 0) { | |
1576 | ret = index_create_file(stream->chan->pathname, | |
1577 | stream->name, stream->uid, stream->gid, | |
1578 | stream->chan->tracefile_size, | |
1579 | stream->tracefile_count_current); | |
1580 | if (ret < 0) { | |
1581 | goto end; | |
1582 | } | |
1583 | stream->index_fd = ret; | |
1584 | } | |
1585 | ||
a6976990 DG |
1586 | /* Reset current size because we just perform a rotation. */ |
1587 | stream->tracefile_size_current = 0; | |
a1ae300f JD |
1588 | stream->out_fd_offset = 0; |
1589 | orig_offset = 0; | |
1624d5b7 JD |
1590 | } |
1591 | stream->tracefile_size_current += len; | |
309167d2 JD |
1592 | if (index) { |
1593 | index->offset = htobe64(stream->out_fd_offset); | |
1594 | } | |
f02e1e8a DG |
1595 | } |
1596 | ||
d02b8372 DG |
1597 | /* |
1598 | * This call guarantee that len or less is returned. It's impossible to | |
1599 | * receive a ret value that is bigger than len. | |
1600 | */ | |
1601 | ret = lttng_write(outfd, mmap_base + mmap_offset, len); | |
1602 | DBG("Consumer mmap write() ret %zd (len %lu)", ret, len); | |
1603 | if (ret < 0 || ((size_t) ret != len)) { | |
1604 | /* | |
1605 | * Report error to caller if nothing was written else at least send the | |
1606 | * amount written. | |
1607 | */ | |
1608 | if (ret < 0) { | |
994ab360 | 1609 | ret = -errno; |
f02e1e8a | 1610 | } |
994ab360 | 1611 | relayd_hang_up = 1; |
f02e1e8a | 1612 | |
d02b8372 | 1613 | /* Socket operation failed. We consider the relayd dead */ |
994ab360 | 1614 | if (errno == EPIPE || errno == EINVAL || errno == EBADF) { |
d02b8372 DG |
1615 | /* |
1616 | * This is possible if the fd is closed on the other side | |
1617 | * (outfd) or any write problem. It can be verbose a bit for a | |
1618 | * normal execution if for instance the relayd is stopped | |
1619 | * abruptly. This can happen so set this to a DBG statement. | |
1620 | */ | |
1621 | DBG("Consumer mmap write detected relayd hang up"); | |
994ab360 DG |
1622 | } else { |
1623 | /* Unhandled error, print it and stop function right now. */ | |
1624 | PERROR("Error in write mmap (ret %zd != len %lu)", ret, len); | |
f02e1e8a | 1625 | } |
994ab360 | 1626 | goto write_error; |
d02b8372 DG |
1627 | } |
1628 | stream->output_written += ret; | |
d02b8372 DG |
1629 | |
1630 | /* This call is useless on a socket so better save a syscall. */ | |
1631 | if (!relayd) { | |
1632 | /* This won't block, but will start writeout asynchronously */ | |
1633 | lttng_sync_file_range(outfd, stream->out_fd_offset, len, | |
1634 | SYNC_FILE_RANGE_WRITE); | |
1635 | stream->out_fd_offset += len; | |
f02e1e8a DG |
1636 | } |
1637 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
1638 | ||
8994307f DG |
1639 | write_error: |
1640 | /* | |
1641 | * This is a special case that the relayd has closed its socket. Let's | |
1642 | * cleanup the relayd object and all associated streams. | |
1643 | */ | |
1644 | if (relayd && relayd_hang_up) { | |
1645 | cleanup_relayd(relayd, ctx); | |
1646 | } | |
1647 | ||
f02e1e8a DG |
1648 | end: |
1649 | /* Unlock only if ctrl socket used */ | |
1650 | if (relayd && stream->metadata_flag) { | |
1651 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1652 | } | |
1653 | ||
1654 | rcu_read_unlock(); | |
994ab360 | 1655 | return ret; |
3bd1e081 MD |
1656 | } |
1657 | ||
1658 | /* | |
1659 | * Splice the data from the ring buffer to the tracefile. | |
1660 | * | |
79d4ffb7 DG |
1661 | * It must be called with the stream lock held. |
1662 | * | |
3bd1e081 MD |
1663 | * Returns the number of bytes spliced. |
1664 | */ | |
4078b776 | 1665 | ssize_t lttng_consumer_on_read_subbuffer_splice( |
3bd1e081 | 1666 | struct lttng_consumer_local_data *ctx, |
1d4dfdef | 1667 | struct lttng_consumer_stream *stream, unsigned long len, |
309167d2 | 1668 | unsigned long padding, |
50adc264 | 1669 | struct ctf_packet_index *index) |
3bd1e081 | 1670 | { |
f02e1e8a DG |
1671 | ssize_t ret = 0, written = 0, ret_splice = 0; |
1672 | loff_t offset = 0; | |
1673 | off_t orig_offset = stream->out_fd_offset; | |
1674 | int fd = stream->wait_fd; | |
1675 | /* Default is on the disk */ | |
1676 | int outfd = stream->out_fd; | |
f02e1e8a | 1677 | struct consumer_relayd_sock_pair *relayd = NULL; |
fb3a43a9 | 1678 | int *splice_pipe; |
8994307f | 1679 | unsigned int relayd_hang_up = 0; |
f02e1e8a | 1680 | |
3bd1e081 MD |
1681 | switch (consumer_data.type) { |
1682 | case LTTNG_CONSUMER_KERNEL: | |
f02e1e8a | 1683 | break; |
7753dea8 MD |
1684 | case LTTNG_CONSUMER32_UST: |
1685 | case LTTNG_CONSUMER64_UST: | |
f02e1e8a | 1686 | /* Not supported for user space tracing */ |
3bd1e081 MD |
1687 | return -ENOSYS; |
1688 | default: | |
1689 | ERR("Unknown consumer_data type"); | |
1690 | assert(0); | |
3bd1e081 MD |
1691 | } |
1692 | ||
f02e1e8a DG |
1693 | /* RCU lock for the relayd pointer */ |
1694 | rcu_read_lock(); | |
1695 | ||
1696 | /* Flag that the current stream if set for network streaming. */ | |
da009f2c | 1697 | if (stream->net_seq_idx != (uint64_t) -1ULL) { |
f02e1e8a DG |
1698 | relayd = consumer_find_relayd(stream->net_seq_idx); |
1699 | if (relayd == NULL) { | |
ad0b0d23 | 1700 | written = -ret; |
f02e1e8a DG |
1701 | goto end; |
1702 | } | |
1703 | } | |
6f2b2a45 | 1704 | splice_pipe = stream->splice_pipe; |
fb3a43a9 | 1705 | |
f02e1e8a | 1706 | /* Write metadata stream id before payload */ |
1d4dfdef | 1707 | if (relayd) { |
ad0b0d23 | 1708 | unsigned long total_len = len; |
f02e1e8a | 1709 | |
1d4dfdef DG |
1710 | if (stream->metadata_flag) { |
1711 | /* | |
1712 | * Lock the control socket for the complete duration of the function | |
1713 | * since from this point on we will use the socket. | |
1714 | */ | |
1715 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1716 | ||
1717 | ret = write_relayd_metadata_id(splice_pipe[1], stream, relayd, | |
1718 | padding); | |
1719 | if (ret < 0) { | |
1720 | written = ret; | |
ad0b0d23 DG |
1721 | relayd_hang_up = 1; |
1722 | goto write_error; | |
1d4dfdef DG |
1723 | } |
1724 | ||
1725 | total_len += sizeof(struct lttcomm_relayd_metadata_payload); | |
1726 | } | |
1727 | ||
1728 | ret = write_relayd_stream_header(stream, total_len, padding, relayd); | |
ad0b0d23 DG |
1729 | if (ret < 0) { |
1730 | written = ret; | |
1731 | relayd_hang_up = 1; | |
1732 | goto write_error; | |
f02e1e8a | 1733 | } |
ad0b0d23 DG |
1734 | /* Use the returned socket. */ |
1735 | outfd = ret; | |
1d4dfdef DG |
1736 | } else { |
1737 | /* No streaming, we have to set the len with the full padding */ | |
1738 | len += padding; | |
1624d5b7 JD |
1739 | |
1740 | /* | |
1741 | * Check if we need to change the tracefile before writing the packet. | |
1742 | */ | |
1743 | if (stream->chan->tracefile_size > 0 && | |
1744 | (stream->tracefile_size_current + len) > | |
1745 | stream->chan->tracefile_size) { | |
fe4477ee JD |
1746 | ret = utils_rotate_stream_file(stream->chan->pathname, |
1747 | stream->name, stream->chan->tracefile_size, | |
1748 | stream->chan->tracefile_count, stream->uid, stream->gid, | |
309167d2 JD |
1749 | stream->out_fd, &(stream->tracefile_count_current), |
1750 | &stream->out_fd); | |
1624d5b7 | 1751 | if (ret < 0) { |
ad0b0d23 | 1752 | written = ret; |
1624d5b7 JD |
1753 | ERR("Rotating output file"); |
1754 | goto end; | |
1755 | } | |
309167d2 JD |
1756 | outfd = stream->out_fd; |
1757 | ||
1758 | if (stream->index_fd >= 0) { | |
1759 | ret = index_create_file(stream->chan->pathname, | |
1760 | stream->name, stream->uid, stream->gid, | |
1761 | stream->chan->tracefile_size, | |
1762 | stream->tracefile_count_current); | |
1763 | if (ret < 0) { | |
ad0b0d23 | 1764 | written = ret; |
309167d2 JD |
1765 | goto end; |
1766 | } | |
1767 | stream->index_fd = ret; | |
1768 | } | |
1769 | ||
a6976990 DG |
1770 | /* Reset current size because we just perform a rotation. */ |
1771 | stream->tracefile_size_current = 0; | |
a1ae300f JD |
1772 | stream->out_fd_offset = 0; |
1773 | orig_offset = 0; | |
1624d5b7 JD |
1774 | } |
1775 | stream->tracefile_size_current += len; | |
309167d2 | 1776 | index->offset = htobe64(stream->out_fd_offset); |
f02e1e8a DG |
1777 | } |
1778 | ||
1779 | while (len > 0) { | |
1d4dfdef DG |
1780 | DBG("splice chan to pipe offset %lu of len %lu (fd : %d, pipe: %d)", |
1781 | (unsigned long)offset, len, fd, splice_pipe[1]); | |
fb3a43a9 | 1782 | ret_splice = splice(fd, &offset, splice_pipe[1], NULL, len, |
f02e1e8a DG |
1783 | SPLICE_F_MOVE | SPLICE_F_MORE); |
1784 | DBG("splice chan to pipe, ret %zd", ret_splice); | |
1785 | if (ret_splice < 0) { | |
d02b8372 | 1786 | ret = errno; |
ad0b0d23 | 1787 | written = -ret; |
d02b8372 | 1788 | PERROR("Error in relay splice"); |
f02e1e8a DG |
1789 | goto splice_error; |
1790 | } | |
1791 | ||
1792 | /* Handle stream on the relayd if the output is on the network */ | |
ad0b0d23 DG |
1793 | if (relayd && stream->metadata_flag) { |
1794 | size_t metadata_payload_size = | |
1795 | sizeof(struct lttcomm_relayd_metadata_payload); | |
1796 | ||
1797 | /* Update counter to fit the spliced data */ | |
1798 | ret_splice += metadata_payload_size; | |
1799 | len += metadata_payload_size; | |
1800 | /* | |
1801 | * We do this so the return value can match the len passed as | |
1802 | * argument to this function. | |
1803 | */ | |
1804 | written -= metadata_payload_size; | |
f02e1e8a DG |
1805 | } |
1806 | ||
1807 | /* Splice data out */ | |
fb3a43a9 | 1808 | ret_splice = splice(splice_pipe[0], NULL, outfd, NULL, |
f02e1e8a | 1809 | ret_splice, SPLICE_F_MOVE | SPLICE_F_MORE); |
6f2b2a45 JD |
1810 | DBG("Consumer splice pipe to file (out_fd: %d), ret %zd", |
1811 | outfd, ret_splice); | |
f02e1e8a | 1812 | if (ret_splice < 0) { |
d02b8372 | 1813 | ret = errno; |
ad0b0d23 DG |
1814 | written = -ret; |
1815 | relayd_hang_up = 1; | |
1816 | goto write_error; | |
f02e1e8a | 1817 | } else if (ret_splice > len) { |
d02b8372 DG |
1818 | /* |
1819 | * We don't expect this code path to be executed but you never know | |
1820 | * so this is an extra protection agains a buggy splice(). | |
1821 | */ | |
f02e1e8a | 1822 | ret = errno; |
ad0b0d23 | 1823 | written += ret_splice; |
d02b8372 DG |
1824 | PERROR("Wrote more data than requested %zd (len: %lu)", ret_splice, |
1825 | len); | |
f02e1e8a | 1826 | goto splice_error; |
d02b8372 DG |
1827 | } else { |
1828 | /* All good, update current len and continue. */ | |
1829 | len -= ret_splice; | |
f02e1e8a | 1830 | } |
f02e1e8a DG |
1831 | |
1832 | /* This call is useless on a socket so better save a syscall. */ | |
1833 | if (!relayd) { | |
1834 | /* This won't block, but will start writeout asynchronously */ | |
1835 | lttng_sync_file_range(outfd, stream->out_fd_offset, ret_splice, | |
1836 | SYNC_FILE_RANGE_WRITE); | |
1837 | stream->out_fd_offset += ret_splice; | |
1838 | } | |
e5d1a9b3 | 1839 | stream->output_written += ret_splice; |
f02e1e8a DG |
1840 | written += ret_splice; |
1841 | } | |
1842 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
f02e1e8a DG |
1843 | goto end; |
1844 | ||
8994307f DG |
1845 | write_error: |
1846 | /* | |
1847 | * This is a special case that the relayd has closed its socket. Let's | |
1848 | * cleanup the relayd object and all associated streams. | |
1849 | */ | |
1850 | if (relayd && relayd_hang_up) { | |
1851 | cleanup_relayd(relayd, ctx); | |
1852 | /* Skip splice error so the consumer does not fail */ | |
1853 | goto end; | |
1854 | } | |
1855 | ||
f02e1e8a DG |
1856 | splice_error: |
1857 | /* send the appropriate error description to sessiond */ | |
1858 | switch (ret) { | |
f02e1e8a | 1859 | case EINVAL: |
f73fabfd | 1860 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_EINVAL); |
f02e1e8a DG |
1861 | break; |
1862 | case ENOMEM: | |
f73fabfd | 1863 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ENOMEM); |
f02e1e8a DG |
1864 | break; |
1865 | case ESPIPE: | |
f73fabfd | 1866 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ESPIPE); |
f02e1e8a DG |
1867 | break; |
1868 | } | |
1869 | ||
1870 | end: | |
1871 | if (relayd && stream->metadata_flag) { | |
1872 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1873 | } | |
1874 | ||
1875 | rcu_read_unlock(); | |
1876 | return written; | |
3bd1e081 MD |
1877 | } |
1878 | ||
1879 | /* | |
1880 | * Take a snapshot for a specific fd | |
1881 | * | |
1882 | * Returns 0 on success, < 0 on error | |
1883 | */ | |
ffe60014 | 1884 | int lttng_consumer_take_snapshot(struct lttng_consumer_stream *stream) |
3bd1e081 MD |
1885 | { |
1886 | switch (consumer_data.type) { | |
1887 | case LTTNG_CONSUMER_KERNEL: | |
ffe60014 | 1888 | return lttng_kconsumer_take_snapshot(stream); |
7753dea8 MD |
1889 | case LTTNG_CONSUMER32_UST: |
1890 | case LTTNG_CONSUMER64_UST: | |
ffe60014 | 1891 | return lttng_ustconsumer_take_snapshot(stream); |
3bd1e081 MD |
1892 | default: |
1893 | ERR("Unknown consumer_data type"); | |
1894 | assert(0); | |
1895 | return -ENOSYS; | |
1896 | } | |
3bd1e081 MD |
1897 | } |
1898 | ||
1899 | /* | |
1900 | * Get the produced position | |
1901 | * | |
1902 | * Returns 0 on success, < 0 on error | |
1903 | */ | |
ffe60014 | 1904 | int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream *stream, |
3bd1e081 MD |
1905 | unsigned long *pos) |
1906 | { | |
1907 | switch (consumer_data.type) { | |
1908 | case LTTNG_CONSUMER_KERNEL: | |
ffe60014 | 1909 | return lttng_kconsumer_get_produced_snapshot(stream, pos); |
7753dea8 MD |
1910 | case LTTNG_CONSUMER32_UST: |
1911 | case LTTNG_CONSUMER64_UST: | |
ffe60014 | 1912 | return lttng_ustconsumer_get_produced_snapshot(stream, pos); |
3bd1e081 MD |
1913 | default: |
1914 | ERR("Unknown consumer_data type"); | |
1915 | assert(0); | |
1916 | return -ENOSYS; | |
1917 | } | |
1918 | } | |
1919 | ||
1920 | int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, | |
1921 | int sock, struct pollfd *consumer_sockpoll) | |
1922 | { | |
1923 | switch (consumer_data.type) { | |
1924 | case LTTNG_CONSUMER_KERNEL: | |
1925 | return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
7753dea8 MD |
1926 | case LTTNG_CONSUMER32_UST: |
1927 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1928 | return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll); |
1929 | default: | |
1930 | ERR("Unknown consumer_data type"); | |
1931 | assert(0); | |
1932 | return -ENOSYS; | |
1933 | } | |
1934 | } | |
1935 | ||
6d574024 | 1936 | void lttng_consumer_close_all_metadata(void) |
d88aee68 DG |
1937 | { |
1938 | switch (consumer_data.type) { | |
1939 | case LTTNG_CONSUMER_KERNEL: | |
1940 | /* | |
1941 | * The Kernel consumer has a different metadata scheme so we don't | |
1942 | * close anything because the stream will be closed by the session | |
1943 | * daemon. | |
1944 | */ | |
1945 | break; | |
1946 | case LTTNG_CONSUMER32_UST: | |
1947 | case LTTNG_CONSUMER64_UST: | |
1948 | /* | |
1949 | * Close all metadata streams. The metadata hash table is passed and | |
1950 | * this call iterates over it by closing all wakeup fd. This is safe | |
1951 | * because at this point we are sure that the metadata producer is | |
1952 | * either dead or blocked. | |
1953 | */ | |
6d574024 | 1954 | lttng_ustconsumer_close_all_metadata(metadata_ht); |
d88aee68 DG |
1955 | break; |
1956 | default: | |
1957 | ERR("Unknown consumer_data type"); | |
1958 | assert(0); | |
1959 | } | |
1960 | } | |
1961 | ||
fb3a43a9 DG |
1962 | /* |
1963 | * Clean up a metadata stream and free its memory. | |
1964 | */ | |
e316aad5 DG |
1965 | void consumer_del_metadata_stream(struct lttng_consumer_stream *stream, |
1966 | struct lttng_ht *ht) | |
fb3a43a9 | 1967 | { |
e316aad5 | 1968 | struct lttng_consumer_channel *free_chan = NULL; |
fb3a43a9 DG |
1969 | |
1970 | assert(stream); | |
1971 | /* | |
1972 | * This call should NEVER receive regular stream. It must always be | |
1973 | * metadata stream and this is crucial for data structure synchronization. | |
1974 | */ | |
1975 | assert(stream->metadata_flag); | |
1976 | ||
e316aad5 DG |
1977 | DBG3("Consumer delete metadata stream %d", stream->wait_fd); |
1978 | ||
74251bb8 | 1979 | pthread_mutex_lock(&consumer_data.lock); |
a9838785 | 1980 | pthread_mutex_lock(&stream->chan->lock); |
8994307f DG |
1981 | pthread_mutex_lock(&stream->lock); |
1982 | ||
6d574024 DG |
1983 | /* Remove any reference to that stream. */ |
1984 | consumer_stream_delete(stream, ht); | |
ca22feea | 1985 | |
6d574024 DG |
1986 | /* Close down everything including the relayd if one. */ |
1987 | consumer_stream_close(stream); | |
1988 | /* Destroy tracer buffers of the stream. */ | |
1989 | consumer_stream_destroy_buffers(stream); | |
fb3a43a9 DG |
1990 | |
1991 | /* Atomically decrement channel refcount since other threads can use it. */ | |
f2ad556d | 1992 | if (!uatomic_sub_return(&stream->chan->refcount, 1) |
ffe60014 | 1993 | && !uatomic_read(&stream->chan->nb_init_stream_left)) { |
c30aaa51 | 1994 | /* Go for channel deletion! */ |
e316aad5 | 1995 | free_chan = stream->chan; |
fb3a43a9 DG |
1996 | } |
1997 | ||
73811ecc DG |
1998 | /* |
1999 | * Nullify the stream reference so it is not used after deletion. The | |
6d574024 DG |
2000 | * channel lock MUST be acquired before being able to check for a NULL |
2001 | * pointer value. | |
73811ecc DG |
2002 | */ |
2003 | stream->chan->metadata_stream = NULL; | |
2004 | ||
8994307f | 2005 | pthread_mutex_unlock(&stream->lock); |
a9838785 | 2006 | pthread_mutex_unlock(&stream->chan->lock); |
74251bb8 | 2007 | pthread_mutex_unlock(&consumer_data.lock); |
e316aad5 DG |
2008 | |
2009 | if (free_chan) { | |
2010 | consumer_del_channel(free_chan); | |
2011 | } | |
2012 | ||
6d574024 | 2013 | consumer_stream_free(stream); |
fb3a43a9 DG |
2014 | } |
2015 | ||
2016 | /* | |
2017 | * Action done with the metadata stream when adding it to the consumer internal | |
2018 | * data structures to handle it. | |
2019 | */ | |
5ab66908 | 2020 | int consumer_add_metadata_stream(struct lttng_consumer_stream *stream) |
fb3a43a9 | 2021 | { |
5ab66908 | 2022 | struct lttng_ht *ht = metadata_ht; |
e316aad5 | 2023 | int ret = 0; |
76082088 | 2024 | struct lttng_ht_iter iter; |
d88aee68 | 2025 | struct lttng_ht_node_u64 *node; |
fb3a43a9 | 2026 | |
e316aad5 DG |
2027 | assert(stream); |
2028 | assert(ht); | |
2029 | ||
d88aee68 | 2030 | DBG3("Adding metadata stream %" PRIu64 " to hash table", stream->key); |
e316aad5 DG |
2031 | |
2032 | pthread_mutex_lock(&consumer_data.lock); | |
a9838785 | 2033 | pthread_mutex_lock(&stream->chan->lock); |
ec6ea7d0 | 2034 | pthread_mutex_lock(&stream->chan->timer_lock); |
2e818a6a | 2035 | pthread_mutex_lock(&stream->lock); |
e316aad5 | 2036 | |
e316aad5 DG |
2037 | /* |
2038 | * From here, refcounts are updated so be _careful_ when returning an error | |
2039 | * after this point. | |
2040 | */ | |
2041 | ||
fb3a43a9 | 2042 | rcu_read_lock(); |
76082088 DG |
2043 | |
2044 | /* | |
2045 | * Lookup the stream just to make sure it does not exist in our internal | |
2046 | * state. This should NEVER happen. | |
2047 | */ | |
d88aee68 DG |
2048 | lttng_ht_lookup(ht, &stream->key, &iter); |
2049 | node = lttng_ht_iter_get_node_u64(&iter); | |
76082088 DG |
2050 | assert(!node); |
2051 | ||
e316aad5 | 2052 | /* |
ffe60014 DG |
2053 | * When nb_init_stream_left reaches 0, we don't need to trigger any action |
2054 | * in terms of destroying the associated channel, because the action that | |
e316aad5 DG |
2055 | * causes the count to become 0 also causes a stream to be added. The |
2056 | * channel deletion will thus be triggered by the following removal of this | |
2057 | * stream. | |
2058 | */ | |
ffe60014 | 2059 | if (uatomic_read(&stream->chan->nb_init_stream_left) > 0) { |
f2ad556d MD |
2060 | /* Increment refcount before decrementing nb_init_stream_left */ |
2061 | cmm_smp_wmb(); | |
ffe60014 | 2062 | uatomic_dec(&stream->chan->nb_init_stream_left); |
e316aad5 DG |
2063 | } |
2064 | ||
d88aee68 | 2065 | lttng_ht_add_unique_u64(ht, &stream->node); |
ca22feea | 2066 | |
d8ef542d MD |
2067 | lttng_ht_add_unique_u64(consumer_data.stream_per_chan_id_ht, |
2068 | &stream->node_channel_id); | |
2069 | ||
ca22feea DG |
2070 | /* |
2071 | * Add stream to the stream_list_ht of the consumer data. No need to steal | |
2072 | * the key since the HT does not use it and we allow to add redundant keys | |
2073 | * into this table. | |
2074 | */ | |
d88aee68 | 2075 | lttng_ht_add_u64(consumer_data.stream_list_ht, &stream->node_session_id); |
ca22feea | 2076 | |
fb3a43a9 | 2077 | rcu_read_unlock(); |
e316aad5 | 2078 | |
2e818a6a | 2079 | pthread_mutex_unlock(&stream->lock); |
a9838785 | 2080 | pthread_mutex_unlock(&stream->chan->lock); |
ec6ea7d0 | 2081 | pthread_mutex_unlock(&stream->chan->timer_lock); |
e316aad5 DG |
2082 | pthread_mutex_unlock(&consumer_data.lock); |
2083 | return ret; | |
fb3a43a9 DG |
2084 | } |
2085 | ||
8994307f DG |
2086 | /* |
2087 | * Delete data stream that are flagged for deletion (endpoint_status). | |
2088 | */ | |
2089 | static void validate_endpoint_status_data_stream(void) | |
2090 | { | |
2091 | struct lttng_ht_iter iter; | |
2092 | struct lttng_consumer_stream *stream; | |
2093 | ||
2094 | DBG("Consumer delete flagged data stream"); | |
2095 | ||
2096 | rcu_read_lock(); | |
2097 | cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) { | |
2098 | /* Validate delete flag of the stream */ | |
79d4ffb7 | 2099 | if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) { |
8994307f DG |
2100 | continue; |
2101 | } | |
2102 | /* Delete it right now */ | |
2103 | consumer_del_stream(stream, data_ht); | |
2104 | } | |
2105 | rcu_read_unlock(); | |
2106 | } | |
2107 | ||
2108 | /* | |
2109 | * Delete metadata stream that are flagged for deletion (endpoint_status). | |
2110 | */ | |
2111 | static void validate_endpoint_status_metadata_stream( | |
2112 | struct lttng_poll_event *pollset) | |
2113 | { | |
2114 | struct lttng_ht_iter iter; | |
2115 | struct lttng_consumer_stream *stream; | |
2116 | ||
2117 | DBG("Consumer delete flagged metadata stream"); | |
2118 | ||
2119 | assert(pollset); | |
2120 | ||
2121 | rcu_read_lock(); | |
2122 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) { | |
2123 | /* Validate delete flag of the stream */ | |
79d4ffb7 | 2124 | if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) { |
8994307f DG |
2125 | continue; |
2126 | } | |
2127 | /* | |
2128 | * Remove from pollset so the metadata thread can continue without | |
2129 | * blocking on a deleted stream. | |
2130 | */ | |
2131 | lttng_poll_del(pollset, stream->wait_fd); | |
2132 | ||
2133 | /* Delete it right now */ | |
2134 | consumer_del_metadata_stream(stream, metadata_ht); | |
2135 | } | |
2136 | rcu_read_unlock(); | |
2137 | } | |
2138 | ||
fb3a43a9 DG |
2139 | /* |
2140 | * Thread polls on metadata file descriptor and write them on disk or on the | |
2141 | * network. | |
2142 | */ | |
7d980def | 2143 | void *consumer_thread_metadata_poll(void *data) |
fb3a43a9 | 2144 | { |
1fc79fb4 | 2145 | int ret, i, pollfd, err = -1; |
fb3a43a9 | 2146 | uint32_t revents, nb_fd; |
e316aad5 | 2147 | struct lttng_consumer_stream *stream = NULL; |
fb3a43a9 | 2148 | struct lttng_ht_iter iter; |
d88aee68 | 2149 | struct lttng_ht_node_u64 *node; |
fb3a43a9 DG |
2150 | struct lttng_poll_event events; |
2151 | struct lttng_consumer_local_data *ctx = data; | |
2152 | ssize_t len; | |
2153 | ||
2154 | rcu_register_thread(); | |
2155 | ||
1fc79fb4 MD |
2156 | health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_METADATA); |
2157 | ||
2d57de81 MD |
2158 | if (testpoint(consumerd_thread_metadata)) { |
2159 | goto error_testpoint; | |
2160 | } | |
2161 | ||
9ce5646a MD |
2162 | health_code_update(); |
2163 | ||
fb3a43a9 DG |
2164 | DBG("Thread metadata poll started"); |
2165 | ||
fb3a43a9 DG |
2166 | /* Size is set to 1 for the consumer_metadata pipe */ |
2167 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
2168 | if (ret < 0) { | |
2169 | ERR("Poll set creation failed"); | |
d8ef542d | 2170 | goto end_poll; |
fb3a43a9 DG |
2171 | } |
2172 | ||
13886d2d DG |
2173 | ret = lttng_poll_add(&events, |
2174 | lttng_pipe_get_readfd(ctx->consumer_metadata_pipe), LPOLLIN); | |
fb3a43a9 DG |
2175 | if (ret < 0) { |
2176 | goto end; | |
2177 | } | |
2178 | ||
2179 | /* Main loop */ | |
2180 | DBG("Metadata main loop started"); | |
2181 | ||
2182 | while (1) { | |
fb3a43a9 | 2183 | restart: |
65da3cc7 | 2184 | health_code_update(); |
9ce5646a | 2185 | health_poll_entry(); |
65da3cc7 | 2186 | DBG("Metadata poll wait"); |
fb3a43a9 | 2187 | ret = lttng_poll_wait(&events, -1); |
65da3cc7 MD |
2188 | DBG("Metadata poll return from wait with %d fd(s)", |
2189 | LTTNG_POLL_GETNB(&events)); | |
9ce5646a | 2190 | health_poll_exit(); |
fb3a43a9 DG |
2191 | DBG("Metadata event catched in thread"); |
2192 | if (ret < 0) { | |
2193 | if (errno == EINTR) { | |
e316aad5 | 2194 | ERR("Poll EINTR catched"); |
fb3a43a9 DG |
2195 | goto restart; |
2196 | } | |
0a7555a7 MD |
2197 | if (LTTNG_POLL_GETNB(&events) == 0) { |
2198 | err = 0; /* All is OK */ | |
2199 | } | |
2200 | goto end; | |
fb3a43a9 DG |
2201 | } |
2202 | ||
0d9c5d77 DG |
2203 | nb_fd = ret; |
2204 | ||
e316aad5 | 2205 | /* From here, the event is a metadata wait fd */ |
fb3a43a9 | 2206 | for (i = 0; i < nb_fd; i++) { |
9ce5646a MD |
2207 | health_code_update(); |
2208 | ||
fb3a43a9 DG |
2209 | revents = LTTNG_POLL_GETEV(&events, i); |
2210 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2211 | ||
e0077699 MD |
2212 | if (!revents) { |
2213 | /* No activity for this FD (poll implementation). */ | |
2214 | continue; | |
2215 | } | |
2216 | ||
13886d2d | 2217 | if (pollfd == lttng_pipe_get_readfd(ctx->consumer_metadata_pipe)) { |
4adabd61 | 2218 | if (revents & (LPOLLERR | LPOLLHUP )) { |
fb3a43a9 DG |
2219 | DBG("Metadata thread pipe hung up"); |
2220 | /* | |
2221 | * Remove the pipe from the poll set and continue the loop | |
2222 | * since their might be data to consume. | |
2223 | */ | |
13886d2d DG |
2224 | lttng_poll_del(&events, |
2225 | lttng_pipe_get_readfd(ctx->consumer_metadata_pipe)); | |
2226 | lttng_pipe_read_close(ctx->consumer_metadata_pipe); | |
fb3a43a9 DG |
2227 | continue; |
2228 | } else if (revents & LPOLLIN) { | |
13886d2d DG |
2229 | ssize_t pipe_len; |
2230 | ||
2231 | pipe_len = lttng_pipe_read(ctx->consumer_metadata_pipe, | |
2232 | &stream, sizeof(stream)); | |
6cd525e8 MD |
2233 | if (pipe_len < sizeof(stream)) { |
2234 | PERROR("read metadata stream"); | |
fb3a43a9 | 2235 | /* |
13886d2d | 2236 | * Continue here to handle the rest of the streams. |
fb3a43a9 DG |
2237 | */ |
2238 | continue; | |
2239 | } | |
2240 | ||
8994307f DG |
2241 | /* A NULL stream means that the state has changed. */ |
2242 | if (stream == NULL) { | |
2243 | /* Check for deleted streams. */ | |
2244 | validate_endpoint_status_metadata_stream(&events); | |
3714380f | 2245 | goto restart; |
8994307f DG |
2246 | } |
2247 | ||
fb3a43a9 DG |
2248 | DBG("Adding metadata stream %d to poll set", |
2249 | stream->wait_fd); | |
2250 | ||
fb3a43a9 DG |
2251 | /* Add metadata stream to the global poll events list */ |
2252 | lttng_poll_add(&events, stream->wait_fd, | |
6d574024 | 2253 | LPOLLIN | LPOLLPRI | LPOLLHUP); |
fb3a43a9 DG |
2254 | } |
2255 | ||
e316aad5 | 2256 | /* Handle other stream */ |
fb3a43a9 DG |
2257 | continue; |
2258 | } | |
2259 | ||
d09e1200 | 2260 | rcu_read_lock(); |
d88aee68 DG |
2261 | { |
2262 | uint64_t tmp_id = (uint64_t) pollfd; | |
2263 | ||
2264 | lttng_ht_lookup(metadata_ht, &tmp_id, &iter); | |
2265 | } | |
2266 | node = lttng_ht_iter_get_node_u64(&iter); | |
e316aad5 | 2267 | assert(node); |
fb3a43a9 DG |
2268 | |
2269 | stream = caa_container_of(node, struct lttng_consumer_stream, | |
58b1f425 | 2270 | node); |
fb3a43a9 | 2271 | |
e316aad5 | 2272 | /* Check for error event */ |
4adabd61 | 2273 | if (revents & (LPOLLERR | LPOLLHUP)) { |
e316aad5 | 2274 | DBG("Metadata fd %d is hup|err.", pollfd); |
fb3a43a9 DG |
2275 | if (!stream->hangup_flush_done |
2276 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
2277 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
2278 | DBG("Attempting to flush and consume the UST buffers"); | |
2279 | lttng_ustconsumer_on_stream_hangup(stream); | |
2280 | ||
2281 | /* We just flushed the stream now read it. */ | |
4bb94b75 | 2282 | do { |
9ce5646a MD |
2283 | health_code_update(); |
2284 | ||
4bb94b75 DG |
2285 | len = ctx->on_buffer_ready(stream, ctx); |
2286 | /* | |
2287 | * We don't check the return value here since if we get | |
2288 | * a negative len, it means an error occured thus we | |
2289 | * simply remove it from the poll set and free the | |
2290 | * stream. | |
2291 | */ | |
2292 | } while (len > 0); | |
fb3a43a9 DG |
2293 | } |
2294 | ||
fb3a43a9 | 2295 | lttng_poll_del(&events, stream->wait_fd); |
e316aad5 DG |
2296 | /* |
2297 | * This call update the channel states, closes file descriptors | |
2298 | * and securely free the stream. | |
2299 | */ | |
2300 | consumer_del_metadata_stream(stream, metadata_ht); | |
2301 | } else if (revents & (LPOLLIN | LPOLLPRI)) { | |
2302 | /* Get the data out of the metadata file descriptor */ | |
2303 | DBG("Metadata available on fd %d", pollfd); | |
2304 | assert(stream->wait_fd == pollfd); | |
2305 | ||
04ef1097 | 2306 | do { |
9ce5646a MD |
2307 | health_code_update(); |
2308 | ||
04ef1097 MD |
2309 | len = ctx->on_buffer_ready(stream, ctx); |
2310 | /* | |
2311 | * We don't check the return value here since if we get | |
2312 | * a negative len, it means an error occured thus we | |
2313 | * simply remove it from the poll set and free the | |
2314 | * stream. | |
2315 | */ | |
2316 | } while (len > 0); | |
2317 | ||
e316aad5 | 2318 | /* It's ok to have an unavailable sub-buffer */ |
b64403e3 | 2319 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2320 | /* Clean up stream from consumer and free it. */ |
2321 | lttng_poll_del(&events, stream->wait_fd); | |
2322 | consumer_del_metadata_stream(stream, metadata_ht); | |
e316aad5 | 2323 | } |
fb3a43a9 | 2324 | } |
e316aad5 DG |
2325 | |
2326 | /* Release RCU lock for the stream looked up */ | |
d09e1200 | 2327 | rcu_read_unlock(); |
fb3a43a9 DG |
2328 | } |
2329 | } | |
2330 | ||
1fc79fb4 MD |
2331 | /* All is OK */ |
2332 | err = 0; | |
fb3a43a9 DG |
2333 | end: |
2334 | DBG("Metadata poll thread exiting"); | |
fb3a43a9 | 2335 | |
d8ef542d MD |
2336 | lttng_poll_clean(&events); |
2337 | end_poll: | |
2d57de81 | 2338 | error_testpoint: |
1fc79fb4 MD |
2339 | if (err) { |
2340 | health_error(); | |
2341 | ERR("Health error occurred in %s", __func__); | |
2342 | } | |
2343 | health_unregister(health_consumerd); | |
fb3a43a9 DG |
2344 | rcu_unregister_thread(); |
2345 | return NULL; | |
2346 | } | |
2347 | ||
3bd1e081 | 2348 | /* |
e4421fec | 2349 | * This thread polls the fds in the set to consume the data and write |
3bd1e081 MD |
2350 | * it to tracefile if necessary. |
2351 | */ | |
7d980def | 2352 | void *consumer_thread_data_poll(void *data) |
3bd1e081 | 2353 | { |
1fc79fb4 | 2354 | int num_rdy, num_hup, high_prio, ret, i, err = -1; |
3bd1e081 MD |
2355 | struct pollfd *pollfd = NULL; |
2356 | /* local view of the streams */ | |
c869f647 | 2357 | struct lttng_consumer_stream **local_stream = NULL, *new_stream = NULL; |
3bd1e081 MD |
2358 | /* local view of consumer_data.fds_count */ |
2359 | int nb_fd = 0; | |
3bd1e081 | 2360 | struct lttng_consumer_local_data *ctx = data; |
00e2e675 | 2361 | ssize_t len; |
3bd1e081 | 2362 | |
e7b994a3 DG |
2363 | rcu_register_thread(); |
2364 | ||
1fc79fb4 MD |
2365 | health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_DATA); |
2366 | ||
2d57de81 MD |
2367 | if (testpoint(consumerd_thread_data)) { |
2368 | goto error_testpoint; | |
2369 | } | |
2370 | ||
9ce5646a MD |
2371 | health_code_update(); |
2372 | ||
4df6c8cb MD |
2373 | local_stream = zmalloc(sizeof(struct lttng_consumer_stream *)); |
2374 | if (local_stream == NULL) { | |
2375 | PERROR("local_stream malloc"); | |
2376 | goto end; | |
2377 | } | |
3bd1e081 MD |
2378 | |
2379 | while (1) { | |
9ce5646a MD |
2380 | health_code_update(); |
2381 | ||
3bd1e081 MD |
2382 | high_prio = 0; |
2383 | num_hup = 0; | |
2384 | ||
2385 | /* | |
e4421fec | 2386 | * the fds set has been updated, we need to update our |
3bd1e081 MD |
2387 | * local array as well |
2388 | */ | |
2389 | pthread_mutex_lock(&consumer_data.lock); | |
2390 | if (consumer_data.need_update) { | |
0e428499 DG |
2391 | free(pollfd); |
2392 | pollfd = NULL; | |
2393 | ||
2394 | free(local_stream); | |
2395 | local_stream = NULL; | |
3bd1e081 | 2396 | |
02b3d176 DG |
2397 | /* |
2398 | * Allocate for all fds +1 for the consumer_data_pipe and +1 for | |
2399 | * wake up pipe. | |
2400 | */ | |
2401 | pollfd = zmalloc((consumer_data.stream_count + 2) * sizeof(struct pollfd)); | |
3bd1e081 | 2402 | if (pollfd == NULL) { |
7a57cf92 | 2403 | PERROR("pollfd malloc"); |
3bd1e081 MD |
2404 | pthread_mutex_unlock(&consumer_data.lock); |
2405 | goto end; | |
2406 | } | |
2407 | ||
02b3d176 | 2408 | local_stream = zmalloc((consumer_data.stream_count + 2) * |
747f8642 | 2409 | sizeof(struct lttng_consumer_stream *)); |
3bd1e081 | 2410 | if (local_stream == NULL) { |
7a57cf92 | 2411 | PERROR("local_stream malloc"); |
3bd1e081 MD |
2412 | pthread_mutex_unlock(&consumer_data.lock); |
2413 | goto end; | |
2414 | } | |
ffe60014 | 2415 | ret = update_poll_array(ctx, &pollfd, local_stream, |
43c34bc3 | 2416 | data_ht); |
3bd1e081 MD |
2417 | if (ret < 0) { |
2418 | ERR("Error in allocating pollfd or local_outfds"); | |
f73fabfd | 2419 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
2420 | pthread_mutex_unlock(&consumer_data.lock); |
2421 | goto end; | |
2422 | } | |
2423 | nb_fd = ret; | |
2424 | consumer_data.need_update = 0; | |
2425 | } | |
2426 | pthread_mutex_unlock(&consumer_data.lock); | |
2427 | ||
4078b776 MD |
2428 | /* No FDs and consumer_quit, consumer_cleanup the thread */ |
2429 | if (nb_fd == 0 && consumer_quit == 1) { | |
1fc79fb4 | 2430 | err = 0; /* All is OK */ |
4078b776 MD |
2431 | goto end; |
2432 | } | |
3bd1e081 | 2433 | /* poll on the array of fds */ |
88f2b785 | 2434 | restart: |
02b3d176 | 2435 | DBG("polling on %d fd", nb_fd + 2); |
9ce5646a | 2436 | health_poll_entry(); |
02b3d176 | 2437 | num_rdy = poll(pollfd, nb_fd + 2, -1); |
9ce5646a | 2438 | health_poll_exit(); |
3bd1e081 MD |
2439 | DBG("poll num_rdy : %d", num_rdy); |
2440 | if (num_rdy == -1) { | |
88f2b785 MD |
2441 | /* |
2442 | * Restart interrupted system call. | |
2443 | */ | |
2444 | if (errno == EINTR) { | |
2445 | goto restart; | |
2446 | } | |
7a57cf92 | 2447 | PERROR("Poll error"); |
f73fabfd | 2448 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
2449 | goto end; |
2450 | } else if (num_rdy == 0) { | |
2451 | DBG("Polling thread timed out"); | |
2452 | goto end; | |
2453 | } | |
2454 | ||
3bd1e081 | 2455 | /* |
50f8ae69 | 2456 | * If the consumer_data_pipe triggered poll go directly to the |
00e2e675 DG |
2457 | * beginning of the loop to update the array. We want to prioritize |
2458 | * array update over low-priority reads. | |
3bd1e081 | 2459 | */ |
509bb1cf | 2460 | if (pollfd[nb_fd].revents & (POLLIN | POLLPRI)) { |
ab30f567 | 2461 | ssize_t pipe_readlen; |
04fdd819 | 2462 | |
50f8ae69 | 2463 | DBG("consumer_data_pipe wake up"); |
acdb9057 DG |
2464 | pipe_readlen = lttng_pipe_read(ctx->consumer_data_pipe, |
2465 | &new_stream, sizeof(new_stream)); | |
6cd525e8 MD |
2466 | if (pipe_readlen < sizeof(new_stream)) { |
2467 | PERROR("Consumer data pipe"); | |
23f5f35d DG |
2468 | /* Continue so we can at least handle the current stream(s). */ |
2469 | continue; | |
2470 | } | |
c869f647 DG |
2471 | |
2472 | /* | |
2473 | * If the stream is NULL, just ignore it. It's also possible that | |
2474 | * the sessiond poll thread changed the consumer_quit state and is | |
2475 | * waking us up to test it. | |
2476 | */ | |
2477 | if (new_stream == NULL) { | |
8994307f | 2478 | validate_endpoint_status_data_stream(); |
c869f647 DG |
2479 | continue; |
2480 | } | |
2481 | ||
c869f647 | 2482 | /* Continue to update the local streams and handle prio ones */ |
3bd1e081 MD |
2483 | continue; |
2484 | } | |
2485 | ||
02b3d176 DG |
2486 | /* Handle wakeup pipe. */ |
2487 | if (pollfd[nb_fd + 1].revents & (POLLIN | POLLPRI)) { | |
2488 | char dummy; | |
2489 | ssize_t pipe_readlen; | |
2490 | ||
2491 | pipe_readlen = lttng_pipe_read(ctx->consumer_wakeup_pipe, &dummy, | |
2492 | sizeof(dummy)); | |
2493 | if (pipe_readlen < 0) { | |
2494 | PERROR("Consumer data wakeup pipe"); | |
2495 | } | |
2496 | /* We've been awakened to handle stream(s). */ | |
2497 | ctx->has_wakeup = 0; | |
2498 | } | |
2499 | ||
3bd1e081 MD |
2500 | /* Take care of high priority channels first. */ |
2501 | for (i = 0; i < nb_fd; i++) { | |
9ce5646a MD |
2502 | health_code_update(); |
2503 | ||
9617607b DG |
2504 | if (local_stream[i] == NULL) { |
2505 | continue; | |
2506 | } | |
fb3a43a9 | 2507 | if (pollfd[i].revents & POLLPRI) { |
d41f73b7 MD |
2508 | DBG("Urgent read on fd %d", pollfd[i].fd); |
2509 | high_prio = 1; | |
4078b776 | 2510 | len = ctx->on_buffer_ready(local_stream[i], ctx); |
d41f73b7 | 2511 | /* it's ok to have an unavailable sub-buffer */ |
b64403e3 | 2512 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2513 | /* Clean the stream and free it. */ |
2514 | consumer_del_stream(local_stream[i], data_ht); | |
9617607b | 2515 | local_stream[i] = NULL; |
4078b776 MD |
2516 | } else if (len > 0) { |
2517 | local_stream[i]->data_read = 1; | |
d41f73b7 | 2518 | } |
3bd1e081 MD |
2519 | } |
2520 | } | |
2521 | ||
4078b776 MD |
2522 | /* |
2523 | * If we read high prio channel in this loop, try again | |
2524 | * for more high prio data. | |
2525 | */ | |
2526 | if (high_prio) { | |
3bd1e081 MD |
2527 | continue; |
2528 | } | |
2529 | ||
2530 | /* Take care of low priority channels. */ | |
4078b776 | 2531 | for (i = 0; i < nb_fd; i++) { |
9ce5646a MD |
2532 | health_code_update(); |
2533 | ||
9617607b DG |
2534 | if (local_stream[i] == NULL) { |
2535 | continue; | |
2536 | } | |
4078b776 | 2537 | if ((pollfd[i].revents & POLLIN) || |
02b3d176 DG |
2538 | local_stream[i]->hangup_flush_done || |
2539 | local_stream[i]->has_data) { | |
4078b776 MD |
2540 | DBG("Normal read on fd %d", pollfd[i].fd); |
2541 | len = ctx->on_buffer_ready(local_stream[i], ctx); | |
2542 | /* it's ok to have an unavailable sub-buffer */ | |
b64403e3 | 2543 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2544 | /* Clean the stream and free it. */ |
2545 | consumer_del_stream(local_stream[i], data_ht); | |
9617607b | 2546 | local_stream[i] = NULL; |
4078b776 MD |
2547 | } else if (len > 0) { |
2548 | local_stream[i]->data_read = 1; | |
2549 | } | |
2550 | } | |
2551 | } | |
2552 | ||
2553 | /* Handle hangup and errors */ | |
2554 | for (i = 0; i < nb_fd; i++) { | |
9ce5646a MD |
2555 | health_code_update(); |
2556 | ||
9617607b DG |
2557 | if (local_stream[i] == NULL) { |
2558 | continue; | |
2559 | } | |
4078b776 MD |
2560 | if (!local_stream[i]->hangup_flush_done |
2561 | && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL)) | |
2562 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
2563 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
2564 | DBG("fd %d is hup|err|nval. Attempting flush and read.", | |
9617607b | 2565 | pollfd[i].fd); |
4078b776 MD |
2566 | lttng_ustconsumer_on_stream_hangup(local_stream[i]); |
2567 | /* Attempt read again, for the data we just flushed. */ | |
2568 | local_stream[i]->data_read = 1; | |
2569 | } | |
2570 | /* | |
2571 | * If the poll flag is HUP/ERR/NVAL and we have | |
2572 | * read no data in this pass, we can remove the | |
2573 | * stream from its hash table. | |
2574 | */ | |
2575 | if ((pollfd[i].revents & POLLHUP)) { | |
2576 | DBG("Polling fd %d tells it has hung up.", pollfd[i].fd); | |
2577 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2578 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2579 | local_stream[i] = NULL; |
4078b776 MD |
2580 | num_hup++; |
2581 | } | |
2582 | } else if (pollfd[i].revents & POLLERR) { | |
2583 | ERR("Error returned in polling fd %d.", pollfd[i].fd); | |
2584 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2585 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2586 | local_stream[i] = NULL; |
4078b776 MD |
2587 | num_hup++; |
2588 | } | |
2589 | } else if (pollfd[i].revents & POLLNVAL) { | |
2590 | ERR("Polling fd %d tells fd is not open.", pollfd[i].fd); | |
2591 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2592 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2593 | local_stream[i] = NULL; |
4078b776 | 2594 | num_hup++; |
3bd1e081 MD |
2595 | } |
2596 | } | |
9617607b DG |
2597 | if (local_stream[i] != NULL) { |
2598 | local_stream[i]->data_read = 0; | |
2599 | } | |
3bd1e081 MD |
2600 | } |
2601 | } | |
1fc79fb4 MD |
2602 | /* All is OK */ |
2603 | err = 0; | |
3bd1e081 MD |
2604 | end: |
2605 | DBG("polling thread exiting"); | |
0e428499 DG |
2606 | free(pollfd); |
2607 | free(local_stream); | |
fb3a43a9 DG |
2608 | |
2609 | /* | |
2610 | * Close the write side of the pipe so epoll_wait() in | |
7d980def DG |
2611 | * consumer_thread_metadata_poll can catch it. The thread is monitoring the |
2612 | * read side of the pipe. If we close them both, epoll_wait strangely does | |
2613 | * not return and could create a endless wait period if the pipe is the | |
2614 | * only tracked fd in the poll set. The thread will take care of closing | |
2615 | * the read side. | |
fb3a43a9 | 2616 | */ |
13886d2d | 2617 | (void) lttng_pipe_write_close(ctx->consumer_metadata_pipe); |
fb3a43a9 | 2618 | |
2d57de81 | 2619 | error_testpoint: |
1fc79fb4 MD |
2620 | if (err) { |
2621 | health_error(); | |
2622 | ERR("Health error occurred in %s", __func__); | |
2623 | } | |
2624 | health_unregister(health_consumerd); | |
2625 | ||
e7b994a3 | 2626 | rcu_unregister_thread(); |
3bd1e081 MD |
2627 | return NULL; |
2628 | } | |
2629 | ||
d8ef542d MD |
2630 | /* |
2631 | * Close wake-up end of each stream belonging to the channel. This will | |
2632 | * allow the poll() on the stream read-side to detect when the | |
2633 | * write-side (application) finally closes them. | |
2634 | */ | |
2635 | static | |
2636 | void consumer_close_channel_streams(struct lttng_consumer_channel *channel) | |
2637 | { | |
2638 | struct lttng_ht *ht; | |
2639 | struct lttng_consumer_stream *stream; | |
2640 | struct lttng_ht_iter iter; | |
2641 | ||
2642 | ht = consumer_data.stream_per_chan_id_ht; | |
2643 | ||
2644 | rcu_read_lock(); | |
2645 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
2646 | ht->hash_fct(&channel->key, lttng_ht_seed), | |
2647 | ht->match_fct, &channel->key, | |
2648 | &iter.iter, stream, node_channel_id.node) { | |
f2ad556d MD |
2649 | /* |
2650 | * Protect against teardown with mutex. | |
2651 | */ | |
2652 | pthread_mutex_lock(&stream->lock); | |
2653 | if (cds_lfht_is_node_deleted(&stream->node.node)) { | |
2654 | goto next; | |
2655 | } | |
d8ef542d MD |
2656 | switch (consumer_data.type) { |
2657 | case LTTNG_CONSUMER_KERNEL: | |
2658 | break; | |
2659 | case LTTNG_CONSUMER32_UST: | |
2660 | case LTTNG_CONSUMER64_UST: | |
b4a650f3 DG |
2661 | if (stream->metadata_flag) { |
2662 | /* Safe and protected by the stream lock. */ | |
2663 | lttng_ustconsumer_close_metadata(stream->chan); | |
2664 | } else { | |
2665 | /* | |
2666 | * Note: a mutex is taken internally within | |
2667 | * liblttng-ust-ctl to protect timer wakeup_fd | |
2668 | * use from concurrent close. | |
2669 | */ | |
2670 | lttng_ustconsumer_close_stream_wakeup(stream); | |
2671 | } | |
d8ef542d MD |
2672 | break; |
2673 | default: | |
2674 | ERR("Unknown consumer_data type"); | |
2675 | assert(0); | |
2676 | } | |
f2ad556d MD |
2677 | next: |
2678 | pthread_mutex_unlock(&stream->lock); | |
d8ef542d MD |
2679 | } |
2680 | rcu_read_unlock(); | |
2681 | } | |
2682 | ||
2683 | static void destroy_channel_ht(struct lttng_ht *ht) | |
2684 | { | |
2685 | struct lttng_ht_iter iter; | |
2686 | struct lttng_consumer_channel *channel; | |
2687 | int ret; | |
2688 | ||
2689 | if (ht == NULL) { | |
2690 | return; | |
2691 | } | |
2692 | ||
2693 | rcu_read_lock(); | |
2694 | cds_lfht_for_each_entry(ht->ht, &iter.iter, channel, wait_fd_node.node) { | |
2695 | ret = lttng_ht_del(ht, &iter); | |
2696 | assert(ret != 0); | |
2697 | } | |
2698 | rcu_read_unlock(); | |
2699 | ||
2700 | lttng_ht_destroy(ht); | |
2701 | } | |
2702 | ||
2703 | /* | |
2704 | * This thread polls the channel fds to detect when they are being | |
2705 | * closed. It closes all related streams if the channel is detected as | |
2706 | * closed. It is currently only used as a shim layer for UST because the | |
2707 | * consumerd needs to keep the per-stream wakeup end of pipes open for | |
2708 | * periodical flush. | |
2709 | */ | |
2710 | void *consumer_thread_channel_poll(void *data) | |
2711 | { | |
1fc79fb4 | 2712 | int ret, i, pollfd, err = -1; |
d8ef542d MD |
2713 | uint32_t revents, nb_fd; |
2714 | struct lttng_consumer_channel *chan = NULL; | |
2715 | struct lttng_ht_iter iter; | |
2716 | struct lttng_ht_node_u64 *node; | |
2717 | struct lttng_poll_event events; | |
2718 | struct lttng_consumer_local_data *ctx = data; | |
2719 | struct lttng_ht *channel_ht; | |
2720 | ||
2721 | rcu_register_thread(); | |
2722 | ||
1fc79fb4 MD |
2723 | health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_CHANNEL); |
2724 | ||
2d57de81 MD |
2725 | if (testpoint(consumerd_thread_channel)) { |
2726 | goto error_testpoint; | |
2727 | } | |
2728 | ||
9ce5646a MD |
2729 | health_code_update(); |
2730 | ||
d8ef542d MD |
2731 | channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
2732 | if (!channel_ht) { | |
2733 | /* ENOMEM at this point. Better to bail out. */ | |
2734 | goto end_ht; | |
2735 | } | |
2736 | ||
2737 | DBG("Thread channel poll started"); | |
2738 | ||
2739 | /* Size is set to 1 for the consumer_channel pipe */ | |
2740 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
2741 | if (ret < 0) { | |
2742 | ERR("Poll set creation failed"); | |
2743 | goto end_poll; | |
2744 | } | |
2745 | ||
2746 | ret = lttng_poll_add(&events, ctx->consumer_channel_pipe[0], LPOLLIN); | |
2747 | if (ret < 0) { | |
2748 | goto end; | |
2749 | } | |
2750 | ||
2751 | /* Main loop */ | |
2752 | DBG("Channel main loop started"); | |
2753 | ||
2754 | while (1) { | |
d8ef542d | 2755 | restart: |
65da3cc7 MD |
2756 | health_code_update(); |
2757 | DBG("Channel poll wait"); | |
9ce5646a | 2758 | health_poll_entry(); |
d8ef542d | 2759 | ret = lttng_poll_wait(&events, -1); |
65da3cc7 MD |
2760 | DBG("Channel poll return from wait with %d fd(s)", |
2761 | LTTNG_POLL_GETNB(&events)); | |
9ce5646a | 2762 | health_poll_exit(); |
d8ef542d MD |
2763 | DBG("Channel event catched in thread"); |
2764 | if (ret < 0) { | |
2765 | if (errno == EINTR) { | |
2766 | ERR("Poll EINTR catched"); | |
2767 | goto restart; | |
2768 | } | |
0a7555a7 MD |
2769 | if (LTTNG_POLL_GETNB(&events) == 0) { |
2770 | err = 0; /* All is OK */ | |
2771 | } | |
d8ef542d MD |
2772 | goto end; |
2773 | } | |
2774 | ||
2775 | nb_fd = ret; | |
2776 | ||
2777 | /* From here, the event is a channel wait fd */ | |
2778 | for (i = 0; i < nb_fd; i++) { | |
9ce5646a MD |
2779 | health_code_update(); |
2780 | ||
d8ef542d MD |
2781 | revents = LTTNG_POLL_GETEV(&events, i); |
2782 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2783 | ||
d8ef542d | 2784 | if (!revents) { |
e0077699 | 2785 | /* No activity for this FD (poll implementation). */ |
d8ef542d MD |
2786 | continue; |
2787 | } | |
e0077699 | 2788 | |
d8ef542d MD |
2789 | if (pollfd == ctx->consumer_channel_pipe[0]) { |
2790 | if (revents & (LPOLLERR | LPOLLHUP)) { | |
2791 | DBG("Channel thread pipe hung up"); | |
2792 | /* | |
2793 | * Remove the pipe from the poll set and continue the loop | |
2794 | * since their might be data to consume. | |
2795 | */ | |
2796 | lttng_poll_del(&events, ctx->consumer_channel_pipe[0]); | |
2797 | continue; | |
2798 | } else if (revents & LPOLLIN) { | |
2799 | enum consumer_channel_action action; | |
a0cbdd2e | 2800 | uint64_t key; |
d8ef542d | 2801 | |
a0cbdd2e | 2802 | ret = read_channel_pipe(ctx, &chan, &key, &action); |
d8ef542d MD |
2803 | if (ret <= 0) { |
2804 | ERR("Error reading channel pipe"); | |
2805 | continue; | |
2806 | } | |
2807 | ||
2808 | switch (action) { | |
2809 | case CONSUMER_CHANNEL_ADD: | |
2810 | DBG("Adding channel %d to poll set", | |
2811 | chan->wait_fd); | |
2812 | ||
2813 | lttng_ht_node_init_u64(&chan->wait_fd_node, | |
2814 | chan->wait_fd); | |
c7260a81 | 2815 | rcu_read_lock(); |
d8ef542d MD |
2816 | lttng_ht_add_unique_u64(channel_ht, |
2817 | &chan->wait_fd_node); | |
c7260a81 | 2818 | rcu_read_unlock(); |
d8ef542d MD |
2819 | /* Add channel to the global poll events list */ |
2820 | lttng_poll_add(&events, chan->wait_fd, | |
2821 | LPOLLIN | LPOLLPRI); | |
2822 | break; | |
a0cbdd2e MD |
2823 | case CONSUMER_CHANNEL_DEL: |
2824 | { | |
b4a650f3 DG |
2825 | /* |
2826 | * This command should never be called if the channel | |
2827 | * has streams monitored by either the data or metadata | |
2828 | * thread. The consumer only notify this thread with a | |
2829 | * channel del. command if it receives a destroy | |
2830 | * channel command from the session daemon that send it | |
2831 | * if a command prior to the GET_CHANNEL failed. | |
2832 | */ | |
2833 | ||
c7260a81 | 2834 | rcu_read_lock(); |
a0cbdd2e MD |
2835 | chan = consumer_find_channel(key); |
2836 | if (!chan) { | |
c7260a81 | 2837 | rcu_read_unlock(); |
a0cbdd2e MD |
2838 | ERR("UST consumer get channel key %" PRIu64 " not found for del channel", key); |
2839 | break; | |
2840 | } | |
2841 | lttng_poll_del(&events, chan->wait_fd); | |
f623cc0b | 2842 | iter.iter.node = &chan->wait_fd_node.node; |
a0cbdd2e MD |
2843 | ret = lttng_ht_del(channel_ht, &iter); |
2844 | assert(ret == 0); | |
a0cbdd2e | 2845 | |
f2a444f1 DG |
2846 | switch (consumer_data.type) { |
2847 | case LTTNG_CONSUMER_KERNEL: | |
2848 | break; | |
2849 | case LTTNG_CONSUMER32_UST: | |
2850 | case LTTNG_CONSUMER64_UST: | |
212d67a2 DG |
2851 | health_code_update(); |
2852 | /* Destroy streams that might have been left in the stream list. */ | |
2853 | clean_channel_stream_list(chan); | |
f2a444f1 DG |
2854 | break; |
2855 | default: | |
2856 | ERR("Unknown consumer_data type"); | |
2857 | assert(0); | |
2858 | } | |
2859 | ||
a0cbdd2e MD |
2860 | /* |
2861 | * Release our own refcount. Force channel deletion even if | |
2862 | * streams were not initialized. | |
2863 | */ | |
2864 | if (!uatomic_sub_return(&chan->refcount, 1)) { | |
2865 | consumer_del_channel(chan); | |
2866 | } | |
c7260a81 | 2867 | rcu_read_unlock(); |
a0cbdd2e MD |
2868 | goto restart; |
2869 | } | |
d8ef542d MD |
2870 | case CONSUMER_CHANNEL_QUIT: |
2871 | /* | |
2872 | * Remove the pipe from the poll set and continue the loop | |
2873 | * since their might be data to consume. | |
2874 | */ | |
2875 | lttng_poll_del(&events, ctx->consumer_channel_pipe[0]); | |
2876 | continue; | |
2877 | default: | |
2878 | ERR("Unknown action"); | |
2879 | break; | |
2880 | } | |
2881 | } | |
2882 | ||
2883 | /* Handle other stream */ | |
2884 | continue; | |
2885 | } | |
2886 | ||
2887 | rcu_read_lock(); | |
2888 | { | |
2889 | uint64_t tmp_id = (uint64_t) pollfd; | |
2890 | ||
2891 | lttng_ht_lookup(channel_ht, &tmp_id, &iter); | |
2892 | } | |
2893 | node = lttng_ht_iter_get_node_u64(&iter); | |
2894 | assert(node); | |
2895 | ||
2896 | chan = caa_container_of(node, struct lttng_consumer_channel, | |
2897 | wait_fd_node); | |
2898 | ||
2899 | /* Check for error event */ | |
2900 | if (revents & (LPOLLERR | LPOLLHUP)) { | |
2901 | DBG("Channel fd %d is hup|err.", pollfd); | |
2902 | ||
2903 | lttng_poll_del(&events, chan->wait_fd); | |
2904 | ret = lttng_ht_del(channel_ht, &iter); | |
2905 | assert(ret == 0); | |
b4a650f3 DG |
2906 | |
2907 | /* | |
2908 | * This will close the wait fd for each stream associated to | |
2909 | * this channel AND monitored by the data/metadata thread thus | |
2910 | * will be clean by the right thread. | |
2911 | */ | |
d8ef542d | 2912 | consumer_close_channel_streams(chan); |
f2ad556d MD |
2913 | |
2914 | /* Release our own refcount */ | |
2915 | if (!uatomic_sub_return(&chan->refcount, 1) | |
2916 | && !uatomic_read(&chan->nb_init_stream_left)) { | |
2917 | consumer_del_channel(chan); | |
2918 | } | |
d8ef542d MD |
2919 | } |
2920 | ||
2921 | /* Release RCU lock for the channel looked up */ | |
2922 | rcu_read_unlock(); | |
2923 | } | |
2924 | } | |
2925 | ||
1fc79fb4 MD |
2926 | /* All is OK */ |
2927 | err = 0; | |
d8ef542d MD |
2928 | end: |
2929 | lttng_poll_clean(&events); | |
2930 | end_poll: | |
2931 | destroy_channel_ht(channel_ht); | |
2932 | end_ht: | |
2d57de81 | 2933 | error_testpoint: |
d8ef542d | 2934 | DBG("Channel poll thread exiting"); |
1fc79fb4 MD |
2935 | if (err) { |
2936 | health_error(); | |
2937 | ERR("Health error occurred in %s", __func__); | |
2938 | } | |
2939 | health_unregister(health_consumerd); | |
d8ef542d MD |
2940 | rcu_unregister_thread(); |
2941 | return NULL; | |
2942 | } | |
2943 | ||
331744e3 JD |
2944 | static int set_metadata_socket(struct lttng_consumer_local_data *ctx, |
2945 | struct pollfd *sockpoll, int client_socket) | |
2946 | { | |
2947 | int ret; | |
2948 | ||
2949 | assert(ctx); | |
2950 | assert(sockpoll); | |
2951 | ||
84382d49 MD |
2952 | ret = lttng_consumer_poll_socket(sockpoll); |
2953 | if (ret) { | |
331744e3 JD |
2954 | goto error; |
2955 | } | |
2956 | DBG("Metadata connection on client_socket"); | |
2957 | ||
2958 | /* Blocking call, waiting for transmission */ | |
2959 | ctx->consumer_metadata_socket = lttcomm_accept_unix_sock(client_socket); | |
2960 | if (ctx->consumer_metadata_socket < 0) { | |
2961 | WARN("On accept metadata"); | |
2962 | ret = -1; | |
2963 | goto error; | |
2964 | } | |
2965 | ret = 0; | |
2966 | ||
2967 | error: | |
2968 | return ret; | |
2969 | } | |
2970 | ||
3bd1e081 MD |
2971 | /* |
2972 | * This thread listens on the consumerd socket and receives the file | |
2973 | * descriptors from the session daemon. | |
2974 | */ | |
7d980def | 2975 | void *consumer_thread_sessiond_poll(void *data) |
3bd1e081 | 2976 | { |
1fc79fb4 | 2977 | int sock = -1, client_socket, ret, err = -1; |
3bd1e081 MD |
2978 | /* |
2979 | * structure to poll for incoming data on communication socket avoids | |
2980 | * making blocking sockets. | |
2981 | */ | |
2982 | struct pollfd consumer_sockpoll[2]; | |
2983 | struct lttng_consumer_local_data *ctx = data; | |
2984 | ||
e7b994a3 DG |
2985 | rcu_register_thread(); |
2986 | ||
1fc79fb4 MD |
2987 | health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_SESSIOND); |
2988 | ||
2d57de81 MD |
2989 | if (testpoint(consumerd_thread_sessiond)) { |
2990 | goto error_testpoint; | |
2991 | } | |
2992 | ||
9ce5646a MD |
2993 | health_code_update(); |
2994 | ||
3bd1e081 MD |
2995 | DBG("Creating command socket %s", ctx->consumer_command_sock_path); |
2996 | unlink(ctx->consumer_command_sock_path); | |
2997 | client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path); | |
2998 | if (client_socket < 0) { | |
2999 | ERR("Cannot create command socket"); | |
3000 | goto end; | |
3001 | } | |
3002 | ||
3003 | ret = lttcomm_listen_unix_sock(client_socket); | |
3004 | if (ret < 0) { | |
3005 | goto end; | |
3006 | } | |
3007 | ||
32258573 | 3008 | DBG("Sending ready command to lttng-sessiond"); |
f73fabfd | 3009 | ret = lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_COMMAND_SOCK_READY); |
3bd1e081 MD |
3010 | /* return < 0 on error, but == 0 is not fatal */ |
3011 | if (ret < 0) { | |
32258573 | 3012 | ERR("Error sending ready command to lttng-sessiond"); |
3bd1e081 MD |
3013 | goto end; |
3014 | } | |
3015 | ||
3bd1e081 MD |
3016 | /* prepare the FDs to poll : to client socket and the should_quit pipe */ |
3017 | consumer_sockpoll[0].fd = ctx->consumer_should_quit[0]; | |
3018 | consumer_sockpoll[0].events = POLLIN | POLLPRI; | |
3019 | consumer_sockpoll[1].fd = client_socket; | |
3020 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
3021 | ||
84382d49 MD |
3022 | ret = lttng_consumer_poll_socket(consumer_sockpoll); |
3023 | if (ret) { | |
3024 | if (ret > 0) { | |
3025 | /* should exit */ | |
3026 | err = 0; | |
3027 | } | |
3bd1e081 MD |
3028 | goto end; |
3029 | } | |
3030 | DBG("Connection on client_socket"); | |
3031 | ||
3032 | /* Blocking call, waiting for transmission */ | |
3033 | sock = lttcomm_accept_unix_sock(client_socket); | |
534d2592 | 3034 | if (sock < 0) { |
3bd1e081 MD |
3035 | WARN("On accept"); |
3036 | goto end; | |
3037 | } | |
3bd1e081 | 3038 | |
331744e3 JD |
3039 | /* |
3040 | * Setup metadata socket which is the second socket connection on the | |
3041 | * command unix socket. | |
3042 | */ | |
3043 | ret = set_metadata_socket(ctx, consumer_sockpoll, client_socket); | |
84382d49 MD |
3044 | if (ret) { |
3045 | if (ret > 0) { | |
3046 | /* should exit */ | |
3047 | err = 0; | |
3048 | } | |
331744e3 JD |
3049 | goto end; |
3050 | } | |
3051 | ||
d96f09c6 DG |
3052 | /* This socket is not useful anymore. */ |
3053 | ret = close(client_socket); | |
3054 | if (ret < 0) { | |
3055 | PERROR("close client_socket"); | |
3056 | } | |
3057 | client_socket = -1; | |
3058 | ||
3bd1e081 MD |
3059 | /* update the polling structure to poll on the established socket */ |
3060 | consumer_sockpoll[1].fd = sock; | |
3061 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
3062 | ||
3063 | while (1) { | |
9ce5646a MD |
3064 | health_code_update(); |
3065 | ||
3066 | health_poll_entry(); | |
3067 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
3068 | health_poll_exit(); | |
84382d49 MD |
3069 | if (ret) { |
3070 | if (ret > 0) { | |
3071 | /* should exit */ | |
3072 | err = 0; | |
3073 | } | |
3bd1e081 MD |
3074 | goto end; |
3075 | } | |
3076 | DBG("Incoming command on sock"); | |
3077 | ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
4cbc1a04 DG |
3078 | if (ret <= 0) { |
3079 | /* | |
3080 | * This could simply be a session daemon quitting. Don't output | |
3081 | * ERR() here. | |
3082 | */ | |
3083 | DBG("Communication interrupted on command socket"); | |
41ba6035 | 3084 | err = 0; |
3bd1e081 MD |
3085 | goto end; |
3086 | } | |
3087 | if (consumer_quit) { | |
3088 | DBG("consumer_thread_receive_fds received quit from signal"); | |
1fc79fb4 | 3089 | err = 0; /* All is OK */ |
3bd1e081 MD |
3090 | goto end; |
3091 | } | |
ffe60014 | 3092 | DBG("received command on sock"); |
3bd1e081 | 3093 | } |
1fc79fb4 MD |
3094 | /* All is OK */ |
3095 | err = 0; | |
3096 | ||
3bd1e081 | 3097 | end: |
ffe60014 | 3098 | DBG("Consumer thread sessiond poll exiting"); |
3bd1e081 | 3099 | |
d88aee68 DG |
3100 | /* |
3101 | * Close metadata streams since the producer is the session daemon which | |
3102 | * just died. | |
3103 | * | |
3104 | * NOTE: for now, this only applies to the UST tracer. | |
3105 | */ | |
6d574024 | 3106 | lttng_consumer_close_all_metadata(); |
d88aee68 | 3107 | |
3bd1e081 MD |
3108 | /* |
3109 | * when all fds have hung up, the polling thread | |
3110 | * can exit cleanly | |
3111 | */ | |
3112 | consumer_quit = 1; | |
3113 | ||
04fdd819 | 3114 | /* |
c869f647 | 3115 | * Notify the data poll thread to poll back again and test the |
8994307f | 3116 | * consumer_quit state that we just set so to quit gracefully. |
04fdd819 | 3117 | */ |
acdb9057 | 3118 | notify_thread_lttng_pipe(ctx->consumer_data_pipe); |
c869f647 | 3119 | |
a0cbdd2e | 3120 | notify_channel_pipe(ctx, NULL, -1, CONSUMER_CHANNEL_QUIT); |
d8ef542d | 3121 | |
5c635c72 MD |
3122 | notify_health_quit_pipe(health_quit_pipe); |
3123 | ||
d96f09c6 DG |
3124 | /* Cleaning up possibly open sockets. */ |
3125 | if (sock >= 0) { | |
3126 | ret = close(sock); | |
3127 | if (ret < 0) { | |
3128 | PERROR("close sock sessiond poll"); | |
3129 | } | |
3130 | } | |
3131 | if (client_socket >= 0) { | |
38476d24 | 3132 | ret = close(client_socket); |
d96f09c6 DG |
3133 | if (ret < 0) { |
3134 | PERROR("close client_socket sessiond poll"); | |
3135 | } | |
3136 | } | |
3137 | ||
2d57de81 | 3138 | error_testpoint: |
1fc79fb4 MD |
3139 | if (err) { |
3140 | health_error(); | |
3141 | ERR("Health error occurred in %s", __func__); | |
3142 | } | |
3143 | health_unregister(health_consumerd); | |
3144 | ||
e7b994a3 | 3145 | rcu_unregister_thread(); |
3bd1e081 MD |
3146 | return NULL; |
3147 | } | |
d41f73b7 | 3148 | |
4078b776 | 3149 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
3150 | struct lttng_consumer_local_data *ctx) |
3151 | { | |
74251bb8 DG |
3152 | ssize_t ret; |
3153 | ||
3154 | pthread_mutex_lock(&stream->lock); | |
94d49140 JD |
3155 | if (stream->metadata_flag) { |
3156 | pthread_mutex_lock(&stream->metadata_rdv_lock); | |
3157 | } | |
74251bb8 | 3158 | |
d41f73b7 MD |
3159 | switch (consumer_data.type) { |
3160 | case LTTNG_CONSUMER_KERNEL: | |
74251bb8 DG |
3161 | ret = lttng_kconsumer_read_subbuffer(stream, ctx); |
3162 | break; | |
7753dea8 MD |
3163 | case LTTNG_CONSUMER32_UST: |
3164 | case LTTNG_CONSUMER64_UST: | |
74251bb8 DG |
3165 | ret = lttng_ustconsumer_read_subbuffer(stream, ctx); |
3166 | break; | |
d41f73b7 MD |
3167 | default: |
3168 | ERR("Unknown consumer_data type"); | |
3169 | assert(0); | |
74251bb8 DG |
3170 | ret = -ENOSYS; |
3171 | break; | |
d41f73b7 | 3172 | } |
74251bb8 | 3173 | |
94d49140 JD |
3174 | if (stream->metadata_flag) { |
3175 | pthread_cond_broadcast(&stream->metadata_rdv); | |
3176 | pthread_mutex_unlock(&stream->metadata_rdv_lock); | |
3177 | } | |
74251bb8 DG |
3178 | pthread_mutex_unlock(&stream->lock); |
3179 | return ret; | |
d41f73b7 MD |
3180 | } |
3181 | ||
3182 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
3183 | { | |
3184 | switch (consumer_data.type) { | |
3185 | case LTTNG_CONSUMER_KERNEL: | |
3186 | return lttng_kconsumer_on_recv_stream(stream); | |
7753dea8 MD |
3187 | case LTTNG_CONSUMER32_UST: |
3188 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
3189 | return lttng_ustconsumer_on_recv_stream(stream); |
3190 | default: | |
3191 | ERR("Unknown consumer_data type"); | |
3192 | assert(0); | |
3193 | return -ENOSYS; | |
3194 | } | |
3195 | } | |
e4421fec DG |
3196 | |
3197 | /* | |
3198 | * Allocate and set consumer data hash tables. | |
3199 | */ | |
282dadbc | 3200 | int lttng_consumer_init(void) |
e4421fec | 3201 | { |
d88aee68 | 3202 | consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
282dadbc MD |
3203 | if (!consumer_data.channel_ht) { |
3204 | goto error; | |
3205 | } | |
3206 | ||
d88aee68 | 3207 | consumer_data.relayd_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
282dadbc MD |
3208 | if (!consumer_data.relayd_ht) { |
3209 | goto error; | |
3210 | } | |
3211 | ||
d88aee68 | 3212 | consumer_data.stream_list_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
282dadbc MD |
3213 | if (!consumer_data.stream_list_ht) { |
3214 | goto error; | |
3215 | } | |
3216 | ||
d8ef542d | 3217 | consumer_data.stream_per_chan_id_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
282dadbc MD |
3218 | if (!consumer_data.stream_per_chan_id_ht) { |
3219 | goto error; | |
3220 | } | |
3221 | ||
3222 | data_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); | |
3223 | if (!data_ht) { | |
3224 | goto error; | |
3225 | } | |
3226 | ||
3227 | metadata_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); | |
3228 | if (!metadata_ht) { | |
3229 | goto error; | |
3230 | } | |
3231 | ||
3232 | return 0; | |
3233 | ||
3234 | error: | |
3235 | return -1; | |
e4421fec | 3236 | } |
7735ef9e DG |
3237 | |
3238 | /* | |
3239 | * Process the ADD_RELAYD command receive by a consumer. | |
3240 | * | |
3241 | * This will create a relayd socket pair and add it to the relayd hash table. | |
3242 | * The caller MUST acquire a RCU read side lock before calling it. | |
3243 | */ | |
da009f2c | 3244 | int consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type, |
7735ef9e | 3245 | struct lttng_consumer_local_data *ctx, int sock, |
6151a90f | 3246 | struct pollfd *consumer_sockpoll, |
d3e2ba59 JD |
3247 | struct lttcomm_relayd_sock *relayd_sock, uint64_t sessiond_id, |
3248 | uint64_t relayd_session_id) | |
7735ef9e | 3249 | { |
cd2b09ed | 3250 | int fd = -1, ret = -1, relayd_created = 0; |
0c759fc9 | 3251 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
d4298c99 | 3252 | struct consumer_relayd_sock_pair *relayd = NULL; |
7735ef9e | 3253 | |
6151a90f JD |
3254 | assert(ctx); |
3255 | assert(relayd_sock); | |
3256 | ||
da009f2c | 3257 | DBG("Consumer adding relayd socket (idx: %" PRIu64 ")", net_seq_idx); |
7735ef9e DG |
3258 | |
3259 | /* Get relayd reference if exists. */ | |
3260 | relayd = consumer_find_relayd(net_seq_idx); | |
3261 | if (relayd == NULL) { | |
da009f2c | 3262 | assert(sock_type == LTTNG_STREAM_CONTROL); |
7735ef9e DG |
3263 | /* Not found. Allocate one. */ |
3264 | relayd = consumer_allocate_relayd_sock_pair(net_seq_idx); | |
3265 | if (relayd == NULL) { | |
0d08d75e | 3266 | ret = -ENOMEM; |
618a6a28 MD |
3267 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; |
3268 | goto error; | |
0d08d75e | 3269 | } else { |
30319bcb | 3270 | relayd->sessiond_session_id = sessiond_id; |
0d08d75e | 3271 | relayd_created = 1; |
7735ef9e | 3272 | } |
0d08d75e DG |
3273 | |
3274 | /* | |
3275 | * This code path MUST continue to the consumer send status message to | |
3276 | * we can notify the session daemon and continue our work without | |
3277 | * killing everything. | |
3278 | */ | |
da009f2c MD |
3279 | } else { |
3280 | /* | |
3281 | * relayd key should never be found for control socket. | |
3282 | */ | |
3283 | assert(sock_type != LTTNG_STREAM_CONTROL); | |
0d08d75e DG |
3284 | } |
3285 | ||
3286 | /* First send a status message before receiving the fds. */ | |
0c759fc9 | 3287 | ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS); |
618a6a28 | 3288 | if (ret < 0) { |
0d08d75e | 3289 | /* Somehow, the session daemon is not responding anymore. */ |
618a6a28 MD |
3290 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL); |
3291 | goto error_nosignal; | |
7735ef9e DG |
3292 | } |
3293 | ||
3294 | /* Poll on consumer socket. */ | |
84382d49 MD |
3295 | ret = lttng_consumer_poll_socket(consumer_sockpoll); |
3296 | if (ret) { | |
3297 | /* Needing to exit in the middle of a command: error. */ | |
0d08d75e | 3298 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
7735ef9e | 3299 | ret = -EINTR; |
618a6a28 | 3300 | goto error_nosignal; |
7735ef9e DG |
3301 | } |
3302 | ||
3303 | /* Get relayd socket from session daemon */ | |
3304 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); | |
3305 | if (ret != sizeof(fd)) { | |
7735ef9e | 3306 | ret = -1; |
4028eeb9 | 3307 | fd = -1; /* Just in case it gets set with an invalid value. */ |
0d08d75e DG |
3308 | |
3309 | /* | |
3310 | * Failing to receive FDs might indicate a major problem such as | |
3311 | * reaching a fd limit during the receive where the kernel returns a | |
3312 | * MSG_CTRUNC and fails to cleanup the fd in the queue. Any case, we | |
3313 | * don't take any chances and stop everything. | |
3314 | * | |
3315 | * XXX: Feature request #558 will fix that and avoid this possible | |
3316 | * issue when reaching the fd limit. | |
3317 | */ | |
3318 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); | |
618a6a28 | 3319 | ret_code = LTTCOMM_CONSUMERD_ERROR_RECV_FD; |
f50f23d9 DG |
3320 | goto error; |
3321 | } | |
3322 | ||
7735ef9e DG |
3323 | /* Copy socket information and received FD */ |
3324 | switch (sock_type) { | |
3325 | case LTTNG_STREAM_CONTROL: | |
3326 | /* Copy received lttcomm socket */ | |
6151a90f JD |
3327 | lttcomm_copy_sock(&relayd->control_sock.sock, &relayd_sock->sock); |
3328 | ret = lttcomm_create_sock(&relayd->control_sock.sock); | |
4028eeb9 | 3329 | /* Handle create_sock error. */ |
f66c074c | 3330 | if (ret < 0) { |
618a6a28 | 3331 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; |
4028eeb9 | 3332 | goto error; |
f66c074c | 3333 | } |
da009f2c MD |
3334 | /* |
3335 | * Close the socket created internally by | |
3336 | * lttcomm_create_sock, so we can replace it by the one | |
3337 | * received from sessiond. | |
3338 | */ | |
3339 | if (close(relayd->control_sock.sock.fd)) { | |
3340 | PERROR("close"); | |
3341 | } | |
7735ef9e DG |
3342 | |
3343 | /* Assign new file descriptor */ | |
6151a90f | 3344 | relayd->control_sock.sock.fd = fd; |
4b29f1ce | 3345 | fd = -1; /* For error path */ |
6151a90f JD |
3346 | /* Assign version values. */ |
3347 | relayd->control_sock.major = relayd_sock->major; | |
3348 | relayd->control_sock.minor = relayd_sock->minor; | |
c5b6f4f0 | 3349 | |
d3e2ba59 | 3350 | relayd->relayd_session_id = relayd_session_id; |
c5b6f4f0 | 3351 | |
7735ef9e DG |
3352 | break; |
3353 | case LTTNG_STREAM_DATA: | |
3354 | /* Copy received lttcomm socket */ | |
6151a90f JD |
3355 | lttcomm_copy_sock(&relayd->data_sock.sock, &relayd_sock->sock); |
3356 | ret = lttcomm_create_sock(&relayd->data_sock.sock); | |
4028eeb9 | 3357 | /* Handle create_sock error. */ |
f66c074c | 3358 | if (ret < 0) { |
618a6a28 | 3359 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; |
4028eeb9 | 3360 | goto error; |
f66c074c | 3361 | } |
da009f2c MD |
3362 | /* |
3363 | * Close the socket created internally by | |
3364 | * lttcomm_create_sock, so we can replace it by the one | |
3365 | * received from sessiond. | |
3366 | */ | |
3367 | if (close(relayd->data_sock.sock.fd)) { | |
3368 | PERROR("close"); | |
3369 | } | |
7735ef9e DG |
3370 | |
3371 | /* Assign new file descriptor */ | |
6151a90f | 3372 | relayd->data_sock.sock.fd = fd; |
4b29f1ce | 3373 | fd = -1; /* for eventual error paths */ |
6151a90f JD |
3374 | /* Assign version values. */ |
3375 | relayd->data_sock.major = relayd_sock->major; | |
3376 | relayd->data_sock.minor = relayd_sock->minor; | |
7735ef9e DG |
3377 | break; |
3378 | default: | |
3379 | ERR("Unknown relayd socket type (%d)", sock_type); | |
59e71485 | 3380 | ret = -1; |
618a6a28 | 3381 | ret_code = LTTCOMM_CONSUMERD_FATAL; |
7735ef9e DG |
3382 | goto error; |
3383 | } | |
3384 | ||
d88aee68 | 3385 | DBG("Consumer %s socket created successfully with net idx %" PRIu64 " (fd: %d)", |
7735ef9e DG |
3386 | sock_type == LTTNG_STREAM_CONTROL ? "control" : "data", |
3387 | relayd->net_seq_idx, fd); | |
3388 | ||
618a6a28 MD |
3389 | /* We successfully added the socket. Send status back. */ |
3390 | ret = consumer_send_status_msg(sock, ret_code); | |
3391 | if (ret < 0) { | |
3392 | /* Somehow, the session daemon is not responding anymore. */ | |
3393 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL); | |
3394 | goto error_nosignal; | |
3395 | } | |
3396 | ||
7735ef9e DG |
3397 | /* |
3398 | * Add relayd socket pair to consumer data hashtable. If object already | |
3399 | * exists or on error, the function gracefully returns. | |
3400 | */ | |
d09e1200 | 3401 | add_relayd(relayd); |
7735ef9e DG |
3402 | |
3403 | /* All good! */ | |
4028eeb9 | 3404 | return 0; |
7735ef9e DG |
3405 | |
3406 | error: | |
618a6a28 MD |
3407 | if (consumer_send_status_msg(sock, ret_code) < 0) { |
3408 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL); | |
3409 | } | |
3410 | ||
3411 | error_nosignal: | |
4028eeb9 DG |
3412 | /* Close received socket if valid. */ |
3413 | if (fd >= 0) { | |
3414 | if (close(fd)) { | |
3415 | PERROR("close received socket"); | |
3416 | } | |
3417 | } | |
cd2b09ed DG |
3418 | |
3419 | if (relayd_created) { | |
cd2b09ed DG |
3420 | free(relayd); |
3421 | } | |
3422 | ||
7735ef9e DG |
3423 | return ret; |
3424 | } | |
ca22feea | 3425 | |
4e9a4686 DG |
3426 | /* |
3427 | * Try to lock the stream mutex. | |
3428 | * | |
3429 | * On success, 1 is returned else 0 indicating that the mutex is NOT lock. | |
3430 | */ | |
3431 | static int stream_try_lock(struct lttng_consumer_stream *stream) | |
3432 | { | |
3433 | int ret; | |
3434 | ||
3435 | assert(stream); | |
3436 | ||
3437 | /* | |
3438 | * Try to lock the stream mutex. On failure, we know that the stream is | |
3439 | * being used else where hence there is data still being extracted. | |
3440 | */ | |
3441 | ret = pthread_mutex_trylock(&stream->lock); | |
3442 | if (ret) { | |
3443 | /* For both EBUSY and EINVAL error, the mutex is NOT locked. */ | |
3444 | ret = 0; | |
3445 | goto end; | |
3446 | } | |
3447 | ||
3448 | ret = 1; | |
3449 | ||
3450 | end: | |
3451 | return ret; | |
3452 | } | |
3453 | ||
f7079f67 DG |
3454 | /* |
3455 | * Search for a relayd associated to the session id and return the reference. | |
3456 | * | |
3457 | * A rcu read side lock MUST be acquire before calling this function and locked | |
3458 | * until the relayd object is no longer necessary. | |
3459 | */ | |
3460 | static struct consumer_relayd_sock_pair *find_relayd_by_session_id(uint64_t id) | |
3461 | { | |
3462 | struct lttng_ht_iter iter; | |
f7079f67 | 3463 | struct consumer_relayd_sock_pair *relayd = NULL; |
f7079f67 DG |
3464 | |
3465 | /* Iterate over all relayd since they are indexed by net_seq_idx. */ | |
3466 | cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd, | |
3467 | node.node) { | |
18261bd1 DG |
3468 | /* |
3469 | * Check by sessiond id which is unique here where the relayd session | |
3470 | * id might not be when having multiple relayd. | |
3471 | */ | |
3472 | if (relayd->sessiond_session_id == id) { | |
f7079f67 | 3473 | /* Found the relayd. There can be only one per id. */ |
18261bd1 | 3474 | goto found; |
f7079f67 DG |
3475 | } |
3476 | } | |
3477 | ||
18261bd1 DG |
3478 | return NULL; |
3479 | ||
3480 | found: | |
f7079f67 DG |
3481 | return relayd; |
3482 | } | |
3483 | ||
ca22feea DG |
3484 | /* |
3485 | * Check if for a given session id there is still data needed to be extract | |
3486 | * from the buffers. | |
3487 | * | |
6d805429 | 3488 | * Return 1 if data is pending or else 0 meaning ready to be read. |
ca22feea | 3489 | */ |
6d805429 | 3490 | int consumer_data_pending(uint64_t id) |
ca22feea DG |
3491 | { |
3492 | int ret; | |
3493 | struct lttng_ht_iter iter; | |
3494 | struct lttng_ht *ht; | |
3495 | struct lttng_consumer_stream *stream; | |
f7079f67 | 3496 | struct consumer_relayd_sock_pair *relayd = NULL; |
6d805429 | 3497 | int (*data_pending)(struct lttng_consumer_stream *); |
ca22feea | 3498 | |
6d805429 | 3499 | DBG("Consumer data pending command on session id %" PRIu64, id); |
ca22feea | 3500 | |
6f6eda74 | 3501 | rcu_read_lock(); |
ca22feea DG |
3502 | pthread_mutex_lock(&consumer_data.lock); |
3503 | ||
3504 | switch (consumer_data.type) { | |
3505 | case LTTNG_CONSUMER_KERNEL: | |
6d805429 | 3506 | data_pending = lttng_kconsumer_data_pending; |
ca22feea DG |
3507 | break; |
3508 | case LTTNG_CONSUMER32_UST: | |
3509 | case LTTNG_CONSUMER64_UST: | |
6d805429 | 3510 | data_pending = lttng_ustconsumer_data_pending; |
ca22feea DG |
3511 | break; |
3512 | default: | |
3513 | ERR("Unknown consumer data type"); | |
3514 | assert(0); | |
3515 | } | |
3516 | ||
3517 | /* Ease our life a bit */ | |
3518 | ht = consumer_data.stream_list_ht; | |
3519 | ||
f7079f67 DG |
3520 | relayd = find_relayd_by_session_id(id); |
3521 | if (relayd) { | |
3522 | /* Send init command for data pending. */ | |
3523 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
3524 | ret = relayd_begin_data_pending(&relayd->control_sock, | |
3525 | relayd->relayd_session_id); | |
3526 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
3527 | if (ret < 0) { | |
3528 | /* Communication error thus the relayd so no data pending. */ | |
3529 | goto data_not_pending; | |
3530 | } | |
3531 | } | |
3532 | ||
c8f59ee5 | 3533 | cds_lfht_for_each_entry_duplicate(ht->ht, |
d88aee68 DG |
3534 | ht->hash_fct(&id, lttng_ht_seed), |
3535 | ht->match_fct, &id, | |
ca22feea | 3536 | &iter.iter, stream, node_session_id.node) { |
4e9a4686 DG |
3537 | /* If this call fails, the stream is being used hence data pending. */ |
3538 | ret = stream_try_lock(stream); | |
3539 | if (!ret) { | |
f7079f67 | 3540 | goto data_pending; |
ca22feea | 3541 | } |
ca22feea | 3542 | |
4e9a4686 DG |
3543 | /* |
3544 | * A removed node from the hash table indicates that the stream has | |
3545 | * been deleted thus having a guarantee that the buffers are closed | |
3546 | * on the consumer side. However, data can still be transmitted | |
3547 | * over the network so don't skip the relayd check. | |
3548 | */ | |
3549 | ret = cds_lfht_is_node_deleted(&stream->node.node); | |
3550 | if (!ret) { | |
3551 | /* Check the stream if there is data in the buffers. */ | |
6d805429 DG |
3552 | ret = data_pending(stream); |
3553 | if (ret == 1) { | |
4e9a4686 | 3554 | pthread_mutex_unlock(&stream->lock); |
f7079f67 | 3555 | goto data_pending; |
4e9a4686 DG |
3556 | } |
3557 | } | |
3558 | ||
3559 | /* Relayd check */ | |
f7079f67 | 3560 | if (relayd) { |
c8f59ee5 DG |
3561 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); |
3562 | if (stream->metadata_flag) { | |
ad7051c0 DG |
3563 | ret = relayd_quiescent_control(&relayd->control_sock, |
3564 | stream->relayd_stream_id); | |
c8f59ee5 | 3565 | } else { |
6d805429 | 3566 | ret = relayd_data_pending(&relayd->control_sock, |
39df6d9f DG |
3567 | stream->relayd_stream_id, |
3568 | stream->next_net_seq_num - 1); | |
c8f59ee5 DG |
3569 | } |
3570 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
6d805429 | 3571 | if (ret == 1) { |
4e9a4686 | 3572 | pthread_mutex_unlock(&stream->lock); |
f7079f67 | 3573 | goto data_pending; |
c8f59ee5 DG |
3574 | } |
3575 | } | |
4e9a4686 | 3576 | pthread_mutex_unlock(&stream->lock); |
c8f59ee5 | 3577 | } |
ca22feea | 3578 | |
f7079f67 DG |
3579 | if (relayd) { |
3580 | unsigned int is_data_inflight = 0; | |
3581 | ||
3582 | /* Send init command for data pending. */ | |
3583 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
3584 | ret = relayd_end_data_pending(&relayd->control_sock, | |
3585 | relayd->relayd_session_id, &is_data_inflight); | |
3586 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
bdd88757 | 3587 | if (ret < 0) { |
f7079f67 DG |
3588 | goto data_not_pending; |
3589 | } | |
bdd88757 DG |
3590 | if (is_data_inflight) { |
3591 | goto data_pending; | |
3592 | } | |
f7079f67 DG |
3593 | } |
3594 | ||
ca22feea | 3595 | /* |
f7079f67 DG |
3596 | * Finding _no_ node in the hash table and no inflight data means that the |
3597 | * stream(s) have been removed thus data is guaranteed to be available for | |
3598 | * analysis from the trace files. | |
ca22feea DG |
3599 | */ |
3600 | ||
f7079f67 | 3601 | data_not_pending: |
ca22feea DG |
3602 | /* Data is available to be read by a viewer. */ |
3603 | pthread_mutex_unlock(&consumer_data.lock); | |
c8f59ee5 | 3604 | rcu_read_unlock(); |
6d805429 | 3605 | return 0; |
ca22feea | 3606 | |
f7079f67 | 3607 | data_pending: |
ca22feea DG |
3608 | /* Data is still being extracted from buffers. */ |
3609 | pthread_mutex_unlock(&consumer_data.lock); | |
c8f59ee5 | 3610 | rcu_read_unlock(); |
6d805429 | 3611 | return 1; |
ca22feea | 3612 | } |
f50f23d9 DG |
3613 | |
3614 | /* | |
3615 | * Send a ret code status message to the sessiond daemon. | |
3616 | * | |
3617 | * Return the sendmsg() return value. | |
3618 | */ | |
3619 | int consumer_send_status_msg(int sock, int ret_code) | |
3620 | { | |
3621 | struct lttcomm_consumer_status_msg msg; | |
3622 | ||
53efb85a | 3623 | memset(&msg, 0, sizeof(msg)); |
f50f23d9 DG |
3624 | msg.ret_code = ret_code; |
3625 | ||
3626 | return lttcomm_send_unix_sock(sock, &msg, sizeof(msg)); | |
3627 | } | |
ffe60014 DG |
3628 | |
3629 | /* | |
3630 | * Send a channel status message to the sessiond daemon. | |
3631 | * | |
3632 | * Return the sendmsg() return value. | |
3633 | */ | |
3634 | int consumer_send_status_channel(int sock, | |
3635 | struct lttng_consumer_channel *channel) | |
3636 | { | |
3637 | struct lttcomm_consumer_status_channel msg; | |
3638 | ||
3639 | assert(sock >= 0); | |
3640 | ||
53efb85a | 3641 | memset(&msg, 0, sizeof(msg)); |
ffe60014 | 3642 | if (!channel) { |
0c759fc9 | 3643 | msg.ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; |
ffe60014 | 3644 | } else { |
0c759fc9 | 3645 | msg.ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
ffe60014 DG |
3646 | msg.key = channel->key; |
3647 | msg.stream_count = channel->streams.count; | |
3648 | } | |
3649 | ||
3650 | return lttcomm_send_unix_sock(sock, &msg, sizeof(msg)); | |
3651 | } | |
5c786ded JD |
3652 | |
3653 | /* | |
3654 | * Using a maximum stream size with the produced and consumed position of a | |
3655 | * stream, computes the new consumed position to be as close as possible to the | |
3656 | * maximum possible stream size. | |
3657 | * | |
3658 | * If maximum stream size is lower than the possible buffer size (produced - | |
3659 | * consumed), the consumed_pos given is returned untouched else the new value | |
3660 | * is returned. | |
3661 | */ | |
3662 | unsigned long consumer_get_consumed_maxsize(unsigned long consumed_pos, | |
3663 | unsigned long produced_pos, uint64_t max_stream_size) | |
3664 | { | |
3665 | if (max_stream_size && max_stream_size < (produced_pos - consumed_pos)) { | |
3666 | /* Offset from the produced position to get the latest buffers. */ | |
3667 | return produced_pos - max_stream_size; | |
3668 | } | |
3669 | ||
3670 | return consumed_pos; | |
3671 | } |