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 | ||
6c1c0768 | 20 | #define _LGPL_SOURCE |
3bd1e081 | 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> |
c8fea79c JR |
45 | #include <common/consumer/consumer-timer.h> |
46 | #include <common/consumer/consumer.h> | |
47 | #include <common/consumer/consumer-stream.h> | |
48 | #include <common/consumer/consumer-testpoint.h> | |
49 | #include <common/align.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 | |
b83e03c4 MD |
287 | switch (consumer_data.type) { |
288 | case LTTNG_CONSUMER_KERNEL: | |
289 | break; | |
290 | case LTTNG_CONSUMER32_UST: | |
291 | case LTTNG_CONSUMER64_UST: | |
292 | lttng_ustconsumer_free_channel(channel); | |
293 | break; | |
294 | default: | |
295 | ERR("Unknown consumer_data type"); | |
296 | abort(); | |
297 | } | |
ffe60014 | 298 | free(channel); |
702b1ea4 MD |
299 | } |
300 | ||
00e2e675 DG |
301 | /* |
302 | * RCU protected relayd socket pair free. | |
303 | */ | |
ffe60014 | 304 | static void free_relayd_rcu(struct rcu_head *head) |
00e2e675 | 305 | { |
d88aee68 DG |
306 | struct lttng_ht_node_u64 *node = |
307 | caa_container_of(head, struct lttng_ht_node_u64, head); | |
00e2e675 DG |
308 | struct consumer_relayd_sock_pair *relayd = |
309 | caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
310 | ||
8994307f DG |
311 | /* |
312 | * Close all sockets. This is done in the call RCU since we don't want the | |
313 | * socket fds to be reassigned thus potentially creating bad state of the | |
314 | * relayd object. | |
315 | * | |
316 | * We do not have to lock the control socket mutex here since at this stage | |
317 | * there is no one referencing to this relayd object. | |
318 | */ | |
319 | (void) relayd_close(&relayd->control_sock); | |
320 | (void) relayd_close(&relayd->data_sock); | |
321 | ||
00e2e675 DG |
322 | free(relayd); |
323 | } | |
324 | ||
325 | /* | |
326 | * Destroy and free relayd socket pair object. | |
00e2e675 | 327 | */ |
51230d70 | 328 | void consumer_destroy_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
329 | { |
330 | int ret; | |
331 | struct lttng_ht_iter iter; | |
332 | ||
173af62f DG |
333 | if (relayd == NULL) { |
334 | return; | |
335 | } | |
336 | ||
00e2e675 DG |
337 | DBG("Consumer destroy and close relayd socket pair"); |
338 | ||
339 | iter.iter.node = &relayd->node.node; | |
340 | ret = lttng_ht_del(consumer_data.relayd_ht, &iter); | |
173af62f | 341 | if (ret != 0) { |
8994307f | 342 | /* We assume the relayd is being or is destroyed */ |
173af62f DG |
343 | return; |
344 | } | |
00e2e675 | 345 | |
00e2e675 | 346 | /* RCU free() call */ |
ffe60014 DG |
347 | call_rcu(&relayd->node.head, free_relayd_rcu); |
348 | } | |
349 | ||
350 | /* | |
351 | * Remove a channel from the global list protected by a mutex. This function is | |
352 | * also responsible for freeing its data structures. | |
353 | */ | |
354 | void consumer_del_channel(struct lttng_consumer_channel *channel) | |
355 | { | |
356 | int ret; | |
357 | struct lttng_ht_iter iter; | |
358 | ||
d88aee68 | 359 | DBG("Consumer delete channel key %" PRIu64, channel->key); |
ffe60014 DG |
360 | |
361 | pthread_mutex_lock(&consumer_data.lock); | |
a9838785 | 362 | pthread_mutex_lock(&channel->lock); |
ffe60014 | 363 | |
212d67a2 DG |
364 | /* Destroy streams that might have been left in the stream list. */ |
365 | clean_channel_stream_list(channel); | |
51e762e5 | 366 | |
d3e2ba59 JD |
367 | if (channel->live_timer_enabled == 1) { |
368 | consumer_timer_live_stop(channel); | |
369 | } | |
370 | ||
ffe60014 DG |
371 | switch (consumer_data.type) { |
372 | case LTTNG_CONSUMER_KERNEL: | |
373 | break; | |
374 | case LTTNG_CONSUMER32_UST: | |
375 | case LTTNG_CONSUMER64_UST: | |
376 | lttng_ustconsumer_del_channel(channel); | |
377 | break; | |
378 | default: | |
379 | ERR("Unknown consumer_data type"); | |
380 | assert(0); | |
381 | goto end; | |
382 | } | |
383 | ||
384 | rcu_read_lock(); | |
385 | iter.iter.node = &channel->node.node; | |
386 | ret = lttng_ht_del(consumer_data.channel_ht, &iter); | |
387 | assert(!ret); | |
388 | rcu_read_unlock(); | |
389 | ||
390 | call_rcu(&channel->node.head, free_channel_rcu); | |
391 | end: | |
a9838785 | 392 | pthread_mutex_unlock(&channel->lock); |
ffe60014 | 393 | pthread_mutex_unlock(&consumer_data.lock); |
00e2e675 DG |
394 | } |
395 | ||
228b5bf7 DG |
396 | /* |
397 | * Iterate over the relayd hash table and destroy each element. Finally, | |
398 | * destroy the whole hash table. | |
399 | */ | |
400 | static void cleanup_relayd_ht(void) | |
401 | { | |
402 | struct lttng_ht_iter iter; | |
403 | struct consumer_relayd_sock_pair *relayd; | |
404 | ||
405 | rcu_read_lock(); | |
406 | ||
407 | cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd, | |
408 | node.node) { | |
51230d70 | 409 | consumer_destroy_relayd(relayd); |
228b5bf7 DG |
410 | } |
411 | ||
228b5bf7 | 412 | rcu_read_unlock(); |
36b588ed MD |
413 | |
414 | lttng_ht_destroy(consumer_data.relayd_ht); | |
228b5bf7 DG |
415 | } |
416 | ||
8994307f DG |
417 | /* |
418 | * Update the end point status of all streams having the given network sequence | |
419 | * index (relayd index). | |
420 | * | |
421 | * It's atomically set without having the stream mutex locked which is fine | |
422 | * because we handle the write/read race with a pipe wakeup for each thread. | |
423 | */ | |
da009f2c | 424 | static void update_endpoint_status_by_netidx(uint64_t net_seq_idx, |
8994307f DG |
425 | enum consumer_endpoint_status status) |
426 | { | |
427 | struct lttng_ht_iter iter; | |
428 | struct lttng_consumer_stream *stream; | |
429 | ||
da009f2c | 430 | DBG("Consumer set delete flag on stream by idx %" PRIu64, net_seq_idx); |
8994307f DG |
431 | |
432 | rcu_read_lock(); | |
433 | ||
434 | /* Let's begin with metadata */ | |
435 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) { | |
436 | if (stream->net_seq_idx == net_seq_idx) { | |
437 | uatomic_set(&stream->endpoint_status, status); | |
438 | DBG("Delete flag set to metadata stream %d", stream->wait_fd); | |
439 | } | |
440 | } | |
441 | ||
442 | /* Follow up by the data streams */ | |
443 | cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) { | |
444 | if (stream->net_seq_idx == net_seq_idx) { | |
445 | uatomic_set(&stream->endpoint_status, status); | |
446 | DBG("Delete flag set to data stream %d", stream->wait_fd); | |
447 | } | |
448 | } | |
449 | rcu_read_unlock(); | |
450 | } | |
451 | ||
452 | /* | |
453 | * Cleanup a relayd object by flagging every associated streams for deletion, | |
454 | * destroying the object meaning removing it from the relayd hash table, | |
455 | * closing the sockets and freeing the memory in a RCU call. | |
456 | * | |
457 | * If a local data context is available, notify the threads that the streams' | |
458 | * state have changed. | |
459 | */ | |
460 | static void cleanup_relayd(struct consumer_relayd_sock_pair *relayd, | |
461 | struct lttng_consumer_local_data *ctx) | |
462 | { | |
da009f2c | 463 | uint64_t netidx; |
8994307f DG |
464 | |
465 | assert(relayd); | |
466 | ||
9617607b DG |
467 | DBG("Cleaning up relayd sockets"); |
468 | ||
8994307f DG |
469 | /* Save the net sequence index before destroying the object */ |
470 | netidx = relayd->net_seq_idx; | |
471 | ||
472 | /* | |
473 | * Delete the relayd from the relayd hash table, close the sockets and free | |
474 | * the object in a RCU call. | |
475 | */ | |
51230d70 | 476 | consumer_destroy_relayd(relayd); |
8994307f DG |
477 | |
478 | /* Set inactive endpoint to all streams */ | |
479 | update_endpoint_status_by_netidx(netidx, CONSUMER_ENDPOINT_INACTIVE); | |
480 | ||
481 | /* | |
482 | * With a local data context, notify the threads that the streams' state | |
483 | * have changed. The write() action on the pipe acts as an "implicit" | |
484 | * memory barrier ordering the updates of the end point status from the | |
485 | * read of this status which happens AFTER receiving this notify. | |
486 | */ | |
487 | if (ctx) { | |
acdb9057 | 488 | notify_thread_lttng_pipe(ctx->consumer_data_pipe); |
13886d2d | 489 | notify_thread_lttng_pipe(ctx->consumer_metadata_pipe); |
8994307f DG |
490 | } |
491 | } | |
492 | ||
a6ba4fe1 DG |
493 | /* |
494 | * Flag a relayd socket pair for destruction. Destroy it if the refcount | |
495 | * reaches zero. | |
496 | * | |
497 | * RCU read side lock MUST be aquired before calling this function. | |
498 | */ | |
499 | void consumer_flag_relayd_for_destroy(struct consumer_relayd_sock_pair *relayd) | |
500 | { | |
501 | assert(relayd); | |
502 | ||
503 | /* Set destroy flag for this object */ | |
504 | uatomic_set(&relayd->destroy_flag, 1); | |
505 | ||
506 | /* Destroy the relayd if refcount is 0 */ | |
507 | if (uatomic_read(&relayd->refcount) == 0) { | |
51230d70 | 508 | consumer_destroy_relayd(relayd); |
a6ba4fe1 DG |
509 | } |
510 | } | |
511 | ||
3bd1e081 | 512 | /* |
1d1a276c DG |
513 | * Completly destroy stream from every visiable data structure and the given |
514 | * hash table if one. | |
515 | * | |
516 | * One this call returns, the stream object is not longer usable nor visible. | |
3bd1e081 | 517 | */ |
e316aad5 DG |
518 | void consumer_del_stream(struct lttng_consumer_stream *stream, |
519 | struct lttng_ht *ht) | |
3bd1e081 | 520 | { |
1d1a276c | 521 | consumer_stream_destroy(stream, ht); |
3bd1e081 MD |
522 | } |
523 | ||
5ab66908 MD |
524 | /* |
525 | * XXX naming of del vs destroy is all mixed up. | |
526 | */ | |
527 | void consumer_del_stream_for_data(struct lttng_consumer_stream *stream) | |
528 | { | |
529 | consumer_stream_destroy(stream, data_ht); | |
530 | } | |
531 | ||
532 | void consumer_del_stream_for_metadata(struct lttng_consumer_stream *stream) | |
533 | { | |
534 | consumer_stream_destroy(stream, metadata_ht); | |
535 | } | |
536 | ||
d88aee68 DG |
537 | struct lttng_consumer_stream *consumer_allocate_stream(uint64_t channel_key, |
538 | uint64_t stream_key, | |
3bd1e081 | 539 | enum lttng_consumer_stream_state state, |
ffe60014 | 540 | const char *channel_name, |
6df2e2c9 | 541 | uid_t uid, |
00e2e675 | 542 | gid_t gid, |
57a269f2 | 543 | uint64_t relayd_id, |
53632229 | 544 | uint64_t session_id, |
ffe60014 DG |
545 | int cpu, |
546 | int *alloc_ret, | |
4891ece8 DG |
547 | enum consumer_channel_type type, |
548 | unsigned int monitor) | |
3bd1e081 | 549 | { |
ffe60014 | 550 | int ret; |
3bd1e081 | 551 | struct lttng_consumer_stream *stream; |
3bd1e081 | 552 | |
effcf122 | 553 | stream = zmalloc(sizeof(*stream)); |
3bd1e081 | 554 | if (stream == NULL) { |
7a57cf92 | 555 | PERROR("malloc struct lttng_consumer_stream"); |
ffe60014 | 556 | ret = -ENOMEM; |
7a57cf92 | 557 | goto end; |
3bd1e081 | 558 | } |
7a57cf92 | 559 | |
d56db448 DG |
560 | rcu_read_lock(); |
561 | ||
3bd1e081 | 562 | stream->key = stream_key; |
3bd1e081 MD |
563 | stream->out_fd = -1; |
564 | stream->out_fd_offset = 0; | |
e5d1a9b3 | 565 | stream->output_written = 0; |
3bd1e081 | 566 | stream->state = state; |
6df2e2c9 MD |
567 | stream->uid = uid; |
568 | stream->gid = gid; | |
ffe60014 | 569 | stream->net_seq_idx = relayd_id; |
53632229 | 570 | stream->session_id = session_id; |
4891ece8 | 571 | stream->monitor = monitor; |
774d490c | 572 | stream->endpoint_status = CONSUMER_ENDPOINT_ACTIVE; |
309167d2 | 573 | stream->index_fd = -1; |
53632229 | 574 | pthread_mutex_init(&stream->lock, NULL); |
c585821b | 575 | pthread_mutex_init(&stream->metadata_timer_lock, NULL); |
58b1f425 | 576 | |
ffe60014 DG |
577 | /* If channel is the metadata, flag this stream as metadata. */ |
578 | if (type == CONSUMER_CHANNEL_TYPE_METADATA) { | |
579 | stream->metadata_flag = 1; | |
580 | /* Metadata is flat out. */ | |
581 | strncpy(stream->name, DEFAULT_METADATA_NAME, sizeof(stream->name)); | |
94d49140 JD |
582 | /* Live rendez-vous point. */ |
583 | pthread_cond_init(&stream->metadata_rdv, NULL); | |
584 | pthread_mutex_init(&stream->metadata_rdv_lock, NULL); | |
58b1f425 | 585 | } else { |
ffe60014 DG |
586 | /* Format stream name to <channel_name>_<cpu_number> */ |
587 | ret = snprintf(stream->name, sizeof(stream->name), "%s_%d", | |
588 | channel_name, cpu); | |
589 | if (ret < 0) { | |
590 | PERROR("snprintf stream name"); | |
591 | goto error; | |
592 | } | |
58b1f425 | 593 | } |
c30aaa51 | 594 | |
ffe60014 | 595 | /* Key is always the wait_fd for streams. */ |
d88aee68 | 596 | lttng_ht_node_init_u64(&stream->node, stream->key); |
ffe60014 | 597 | |
d8ef542d MD |
598 | /* Init node per channel id key */ |
599 | lttng_ht_node_init_u64(&stream->node_channel_id, channel_key); | |
600 | ||
53632229 | 601 | /* Init session id node with the stream session id */ |
d88aee68 | 602 | lttng_ht_node_init_u64(&stream->node_session_id, stream->session_id); |
53632229 | 603 | |
07b86b52 JD |
604 | DBG3("Allocated stream %s (key %" PRIu64 ", chan_key %" PRIu64 |
605 | " relayd_id %" PRIu64 ", session_id %" PRIu64, | |
606 | stream->name, stream->key, channel_key, | |
607 | stream->net_seq_idx, stream->session_id); | |
d56db448 DG |
608 | |
609 | rcu_read_unlock(); | |
3bd1e081 | 610 | return stream; |
c80048c6 MD |
611 | |
612 | error: | |
d56db448 | 613 | rcu_read_unlock(); |
c80048c6 | 614 | free(stream); |
7a57cf92 | 615 | end: |
ffe60014 DG |
616 | if (alloc_ret) { |
617 | *alloc_ret = ret; | |
618 | } | |
c80048c6 | 619 | return NULL; |
3bd1e081 MD |
620 | } |
621 | ||
622 | /* | |
623 | * Add a stream to the global list protected by a mutex. | |
624 | */ | |
5ab66908 | 625 | int consumer_add_data_stream(struct lttng_consumer_stream *stream) |
3bd1e081 | 626 | { |
5ab66908 | 627 | struct lttng_ht *ht = data_ht; |
3bd1e081 MD |
628 | int ret = 0; |
629 | ||
e316aad5 | 630 | assert(stream); |
43c34bc3 | 631 | assert(ht); |
c77fc10a | 632 | |
d88aee68 | 633 | DBG3("Adding consumer stream %" PRIu64, stream->key); |
e316aad5 DG |
634 | |
635 | pthread_mutex_lock(&consumer_data.lock); | |
a9838785 | 636 | pthread_mutex_lock(&stream->chan->lock); |
ec6ea7d0 | 637 | pthread_mutex_lock(&stream->chan->timer_lock); |
2e818a6a | 638 | pthread_mutex_lock(&stream->lock); |
b0b335c8 | 639 | rcu_read_lock(); |
e316aad5 | 640 | |
43c34bc3 | 641 | /* Steal stream identifier to avoid having streams with the same key */ |
ffe60014 | 642 | steal_stream_key(stream->key, ht); |
43c34bc3 | 643 | |
d88aee68 | 644 | lttng_ht_add_unique_u64(ht, &stream->node); |
00e2e675 | 645 | |
d8ef542d MD |
646 | lttng_ht_add_u64(consumer_data.stream_per_chan_id_ht, |
647 | &stream->node_channel_id); | |
648 | ||
ca22feea DG |
649 | /* |
650 | * Add stream to the stream_list_ht of the consumer data. No need to steal | |
651 | * the key since the HT does not use it and we allow to add redundant keys | |
652 | * into this table. | |
653 | */ | |
d88aee68 | 654 | lttng_ht_add_u64(consumer_data.stream_list_ht, &stream->node_session_id); |
ca22feea | 655 | |
e316aad5 | 656 | /* |
ffe60014 DG |
657 | * When nb_init_stream_left reaches 0, we don't need to trigger any action |
658 | * in terms of destroying the associated channel, because the action that | |
e316aad5 DG |
659 | * causes the count to become 0 also causes a stream to be added. The |
660 | * channel deletion will thus be triggered by the following removal of this | |
661 | * stream. | |
662 | */ | |
ffe60014 | 663 | if (uatomic_read(&stream->chan->nb_init_stream_left) > 0) { |
f2ad556d MD |
664 | /* Increment refcount before decrementing nb_init_stream_left */ |
665 | cmm_smp_wmb(); | |
ffe60014 | 666 | uatomic_dec(&stream->chan->nb_init_stream_left); |
e316aad5 DG |
667 | } |
668 | ||
669 | /* Update consumer data once the node is inserted. */ | |
3bd1e081 MD |
670 | consumer_data.stream_count++; |
671 | consumer_data.need_update = 1; | |
672 | ||
e316aad5 | 673 | rcu_read_unlock(); |
2e818a6a | 674 | pthread_mutex_unlock(&stream->lock); |
ec6ea7d0 | 675 | pthread_mutex_unlock(&stream->chan->timer_lock); |
a9838785 | 676 | pthread_mutex_unlock(&stream->chan->lock); |
3bd1e081 | 677 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 678 | |
3bd1e081 MD |
679 | return ret; |
680 | } | |
681 | ||
5ab66908 MD |
682 | void consumer_del_data_stream(struct lttng_consumer_stream *stream) |
683 | { | |
684 | consumer_del_stream(stream, data_ht); | |
685 | } | |
686 | ||
00e2e675 | 687 | /* |
3f8e211f DG |
688 | * Add relayd socket to global consumer data hashtable. RCU read side lock MUST |
689 | * be acquired before calling this. | |
00e2e675 | 690 | */ |
d09e1200 | 691 | static int add_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
692 | { |
693 | int ret = 0; | |
d88aee68 | 694 | struct lttng_ht_node_u64 *node; |
00e2e675 DG |
695 | struct lttng_ht_iter iter; |
696 | ||
ffe60014 | 697 | assert(relayd); |
00e2e675 | 698 | |
00e2e675 | 699 | lttng_ht_lookup(consumer_data.relayd_ht, |
d88aee68 DG |
700 | &relayd->net_seq_idx, &iter); |
701 | node = lttng_ht_iter_get_node_u64(&iter); | |
00e2e675 | 702 | if (node != NULL) { |
00e2e675 DG |
703 | goto end; |
704 | } | |
d88aee68 | 705 | lttng_ht_add_unique_u64(consumer_data.relayd_ht, &relayd->node); |
00e2e675 | 706 | |
00e2e675 DG |
707 | end: |
708 | return ret; | |
709 | } | |
710 | ||
711 | /* | |
712 | * Allocate and return a consumer relayd socket. | |
713 | */ | |
027a694f | 714 | static struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair( |
da009f2c | 715 | uint64_t net_seq_idx) |
00e2e675 DG |
716 | { |
717 | struct consumer_relayd_sock_pair *obj = NULL; | |
718 | ||
da009f2c MD |
719 | /* net sequence index of -1 is a failure */ |
720 | if (net_seq_idx == (uint64_t) -1ULL) { | |
00e2e675 DG |
721 | goto error; |
722 | } | |
723 | ||
724 | obj = zmalloc(sizeof(struct consumer_relayd_sock_pair)); | |
725 | if (obj == NULL) { | |
726 | PERROR("zmalloc relayd sock"); | |
727 | goto error; | |
728 | } | |
729 | ||
730 | obj->net_seq_idx = net_seq_idx; | |
731 | obj->refcount = 0; | |
173af62f | 732 | obj->destroy_flag = 0; |
f96e4545 MD |
733 | obj->control_sock.sock.fd = -1; |
734 | obj->data_sock.sock.fd = -1; | |
d88aee68 | 735 | lttng_ht_node_init_u64(&obj->node, obj->net_seq_idx); |
00e2e675 DG |
736 | pthread_mutex_init(&obj->ctrl_sock_mutex, NULL); |
737 | ||
738 | error: | |
739 | return obj; | |
740 | } | |
741 | ||
742 | /* | |
743 | * Find a relayd socket pair in the global consumer data. | |
744 | * | |
745 | * Return the object if found else NULL. | |
b0b335c8 MD |
746 | * RCU read-side lock must be held across this call and while using the |
747 | * returned object. | |
00e2e675 | 748 | */ |
d88aee68 | 749 | struct consumer_relayd_sock_pair *consumer_find_relayd(uint64_t key) |
00e2e675 DG |
750 | { |
751 | struct lttng_ht_iter iter; | |
d88aee68 | 752 | struct lttng_ht_node_u64 *node; |
00e2e675 DG |
753 | struct consumer_relayd_sock_pair *relayd = NULL; |
754 | ||
755 | /* Negative keys are lookup failures */ | |
d88aee68 | 756 | if (key == (uint64_t) -1ULL) { |
00e2e675 DG |
757 | goto error; |
758 | } | |
759 | ||
d88aee68 | 760 | lttng_ht_lookup(consumer_data.relayd_ht, &key, |
00e2e675 | 761 | &iter); |
d88aee68 | 762 | node = lttng_ht_iter_get_node_u64(&iter); |
00e2e675 DG |
763 | if (node != NULL) { |
764 | relayd = caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
765 | } | |
766 | ||
00e2e675 DG |
767 | error: |
768 | return relayd; | |
769 | } | |
770 | ||
10a50311 JD |
771 | /* |
772 | * Find a relayd and send the stream | |
773 | * | |
774 | * Returns 0 on success, < 0 on error | |
775 | */ | |
776 | int consumer_send_relayd_stream(struct lttng_consumer_stream *stream, | |
777 | char *path) | |
778 | { | |
779 | int ret = 0; | |
780 | struct consumer_relayd_sock_pair *relayd; | |
781 | ||
782 | assert(stream); | |
783 | assert(stream->net_seq_idx != -1ULL); | |
784 | assert(path); | |
785 | ||
786 | /* The stream is not metadata. Get relayd reference if exists. */ | |
787 | rcu_read_lock(); | |
788 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
789 | if (relayd != NULL) { | |
790 | /* Add stream on the relayd */ | |
791 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
792 | ret = relayd_add_stream(&relayd->control_sock, stream->name, | |
793 | path, &stream->relayd_stream_id, | |
794 | stream->chan->tracefile_size, stream->chan->tracefile_count); | |
795 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
796 | if (ret < 0) { | |
797 | goto end; | |
798 | } | |
1c20f0e2 | 799 | |
10a50311 | 800 | uatomic_inc(&relayd->refcount); |
d01178b6 | 801 | stream->sent_to_relayd = 1; |
10a50311 JD |
802 | } else { |
803 | ERR("Stream %" PRIu64 " relayd ID %" PRIu64 " unknown. Can't send it.", | |
804 | stream->key, stream->net_seq_idx); | |
805 | ret = -1; | |
806 | goto end; | |
807 | } | |
808 | ||
809 | DBG("Stream %s with key %" PRIu64 " sent to relayd id %" PRIu64, | |
810 | stream->name, stream->key, stream->net_seq_idx); | |
811 | ||
812 | end: | |
813 | rcu_read_unlock(); | |
814 | return ret; | |
815 | } | |
816 | ||
a4baae1b JD |
817 | /* |
818 | * Find a relayd and send the streams sent message | |
819 | * | |
820 | * Returns 0 on success, < 0 on error | |
821 | */ | |
822 | int consumer_send_relayd_streams_sent(uint64_t net_seq_idx) | |
823 | { | |
824 | int ret = 0; | |
825 | struct consumer_relayd_sock_pair *relayd; | |
826 | ||
827 | assert(net_seq_idx != -1ULL); | |
828 | ||
829 | /* The stream is not metadata. Get relayd reference if exists. */ | |
830 | rcu_read_lock(); | |
831 | relayd = consumer_find_relayd(net_seq_idx); | |
832 | if (relayd != NULL) { | |
833 | /* Add stream on the relayd */ | |
834 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
835 | ret = relayd_streams_sent(&relayd->control_sock); | |
836 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
837 | if (ret < 0) { | |
838 | goto end; | |
839 | } | |
840 | } else { | |
841 | ERR("Relayd ID %" PRIu64 " unknown. Can't send streams_sent.", | |
842 | net_seq_idx); | |
843 | ret = -1; | |
844 | goto end; | |
845 | } | |
846 | ||
847 | ret = 0; | |
848 | DBG("All streams sent relayd id %" PRIu64, net_seq_idx); | |
849 | ||
850 | end: | |
851 | rcu_read_unlock(); | |
852 | return ret; | |
853 | } | |
854 | ||
10a50311 JD |
855 | /* |
856 | * Find a relayd and close the stream | |
857 | */ | |
858 | void close_relayd_stream(struct lttng_consumer_stream *stream) | |
859 | { | |
860 | struct consumer_relayd_sock_pair *relayd; | |
861 | ||
862 | /* The stream is not metadata. Get relayd reference if exists. */ | |
863 | rcu_read_lock(); | |
864 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
865 | if (relayd) { | |
866 | consumer_stream_relayd_close(stream, relayd); | |
867 | } | |
868 | rcu_read_unlock(); | |
869 | } | |
870 | ||
00e2e675 DG |
871 | /* |
872 | * Handle stream for relayd transmission if the stream applies for network | |
873 | * streaming where the net sequence index is set. | |
874 | * | |
875 | * Return destination file descriptor or negative value on error. | |
876 | */ | |
6197aea7 | 877 | static int write_relayd_stream_header(struct lttng_consumer_stream *stream, |
1d4dfdef DG |
878 | size_t data_size, unsigned long padding, |
879 | struct consumer_relayd_sock_pair *relayd) | |
00e2e675 DG |
880 | { |
881 | int outfd = -1, ret; | |
00e2e675 DG |
882 | struct lttcomm_relayd_data_hdr data_hdr; |
883 | ||
884 | /* Safety net */ | |
885 | assert(stream); | |
6197aea7 | 886 | assert(relayd); |
00e2e675 DG |
887 | |
888 | /* Reset data header */ | |
889 | memset(&data_hdr, 0, sizeof(data_hdr)); | |
890 | ||
00e2e675 DG |
891 | if (stream->metadata_flag) { |
892 | /* Caller MUST acquire the relayd control socket lock */ | |
893 | ret = relayd_send_metadata(&relayd->control_sock, data_size); | |
894 | if (ret < 0) { | |
895 | goto error; | |
896 | } | |
897 | ||
898 | /* Metadata are always sent on the control socket. */ | |
6151a90f | 899 | outfd = relayd->control_sock.sock.fd; |
00e2e675 DG |
900 | } else { |
901 | /* Set header with stream information */ | |
902 | data_hdr.stream_id = htobe64(stream->relayd_stream_id); | |
903 | data_hdr.data_size = htobe32(data_size); | |
1d4dfdef | 904 | data_hdr.padding_size = htobe32(padding); |
39df6d9f DG |
905 | /* |
906 | * Note that net_seq_num below is assigned with the *current* value of | |
907 | * next_net_seq_num and only after that the next_net_seq_num will be | |
908 | * increment. This is why when issuing a command on the relayd using | |
909 | * this next value, 1 should always be substracted in order to compare | |
910 | * the last seen sequence number on the relayd side to the last sent. | |
911 | */ | |
3604f373 | 912 | data_hdr.net_seq_num = htobe64(stream->next_net_seq_num); |
00e2e675 DG |
913 | /* Other fields are zeroed previously */ |
914 | ||
915 | ret = relayd_send_data_hdr(&relayd->data_sock, &data_hdr, | |
916 | sizeof(data_hdr)); | |
917 | if (ret < 0) { | |
918 | goto error; | |
919 | } | |
920 | ||
3604f373 DG |
921 | ++stream->next_net_seq_num; |
922 | ||
00e2e675 | 923 | /* Set to go on data socket */ |
6151a90f | 924 | outfd = relayd->data_sock.sock.fd; |
00e2e675 DG |
925 | } |
926 | ||
927 | error: | |
928 | return outfd; | |
929 | } | |
930 | ||
3bd1e081 | 931 | /* |
ffe60014 DG |
932 | * Allocate and return a new lttng_consumer_channel object using the given key |
933 | * to initialize the hash table node. | |
934 | * | |
935 | * On error, return NULL. | |
3bd1e081 | 936 | */ |
886224ff | 937 | struct lttng_consumer_channel *consumer_allocate_channel(uint64_t key, |
ffe60014 DG |
938 | uint64_t session_id, |
939 | const char *pathname, | |
940 | const char *name, | |
941 | uid_t uid, | |
942 | gid_t gid, | |
57a269f2 | 943 | uint64_t relayd_id, |
1624d5b7 JD |
944 | enum lttng_event_output output, |
945 | uint64_t tracefile_size, | |
2bba9e53 | 946 | uint64_t tracefile_count, |
1950109e | 947 | uint64_t session_id_per_pid, |
ecc48a90 | 948 | unsigned int monitor, |
d7ba1388 | 949 | unsigned int live_timer_interval, |
3d071855 | 950 | const char *root_shm_path, |
d7ba1388 | 951 | const char *shm_path) |
3bd1e081 MD |
952 | { |
953 | struct lttng_consumer_channel *channel; | |
3bd1e081 | 954 | |
276b26d1 | 955 | channel = zmalloc(sizeof(*channel)); |
3bd1e081 | 956 | if (channel == NULL) { |
7a57cf92 | 957 | PERROR("malloc struct lttng_consumer_channel"); |
3bd1e081 MD |
958 | goto end; |
959 | } | |
ffe60014 DG |
960 | |
961 | channel->key = key; | |
3bd1e081 | 962 | channel->refcount = 0; |
ffe60014 | 963 | channel->session_id = session_id; |
1950109e | 964 | channel->session_id_per_pid = session_id_per_pid; |
ffe60014 DG |
965 | channel->uid = uid; |
966 | channel->gid = gid; | |
967 | channel->relayd_id = relayd_id; | |
1624d5b7 JD |
968 | channel->tracefile_size = tracefile_size; |
969 | channel->tracefile_count = tracefile_count; | |
2bba9e53 | 970 | channel->monitor = monitor; |
ecc48a90 | 971 | channel->live_timer_interval = live_timer_interval; |
a9838785 | 972 | pthread_mutex_init(&channel->lock, NULL); |
ec6ea7d0 | 973 | pthread_mutex_init(&channel->timer_lock, NULL); |
ffe60014 | 974 | |
0c759fc9 DG |
975 | switch (output) { |
976 | case LTTNG_EVENT_SPLICE: | |
977 | channel->output = CONSUMER_CHANNEL_SPLICE; | |
978 | break; | |
979 | case LTTNG_EVENT_MMAP: | |
980 | channel->output = CONSUMER_CHANNEL_MMAP; | |
981 | break; | |
982 | default: | |
983 | assert(0); | |
984 | free(channel); | |
985 | channel = NULL; | |
986 | goto end; | |
987 | } | |
988 | ||
07b86b52 JD |
989 | /* |
990 | * In monitor mode, the streams associated with the channel will be put in | |
991 | * a special list ONLY owned by this channel. So, the refcount is set to 1 | |
992 | * here meaning that the channel itself has streams that are referenced. | |
993 | * | |
994 | * On a channel deletion, once the channel is no longer visible, the | |
995 | * refcount is decremented and checked for a zero value to delete it. With | |
996 | * streams in no monitor mode, it will now be safe to destroy the channel. | |
997 | */ | |
998 | if (!channel->monitor) { | |
999 | channel->refcount = 1; | |
1000 | } | |
1001 | ||
ffe60014 DG |
1002 | strncpy(channel->pathname, pathname, sizeof(channel->pathname)); |
1003 | channel->pathname[sizeof(channel->pathname) - 1] = '\0'; | |
1004 | ||
1005 | strncpy(channel->name, name, sizeof(channel->name)); | |
1006 | channel->name[sizeof(channel->name) - 1] = '\0'; | |
1007 | ||
3d071855 MD |
1008 | if (root_shm_path) { |
1009 | strncpy(channel->root_shm_path, root_shm_path, sizeof(channel->root_shm_path)); | |
1010 | channel->root_shm_path[sizeof(channel->root_shm_path) - 1] = '\0'; | |
1011 | } | |
d7ba1388 MD |
1012 | if (shm_path) { |
1013 | strncpy(channel->shm_path, shm_path, sizeof(channel->shm_path)); | |
1014 | channel->shm_path[sizeof(channel->shm_path) - 1] = '\0'; | |
1015 | } | |
1016 | ||
d88aee68 | 1017 | lttng_ht_node_init_u64(&channel->node, channel->key); |
d8ef542d MD |
1018 | |
1019 | channel->wait_fd = -1; | |
1020 | ||
ffe60014 DG |
1021 | CDS_INIT_LIST_HEAD(&channel->streams.head); |
1022 | ||
d88aee68 | 1023 | DBG("Allocated channel (key %" PRIu64 ")", channel->key) |
3bd1e081 | 1024 | |
3bd1e081 MD |
1025 | end: |
1026 | return channel; | |
1027 | } | |
1028 | ||
1029 | /* | |
1030 | * Add a channel to the global list protected by a mutex. | |
821fffb2 | 1031 | * |
b5a6470f | 1032 | * Always return 0 indicating success. |
3bd1e081 | 1033 | */ |
d8ef542d MD |
1034 | int consumer_add_channel(struct lttng_consumer_channel *channel, |
1035 | struct lttng_consumer_local_data *ctx) | |
3bd1e081 | 1036 | { |
3bd1e081 | 1037 | pthread_mutex_lock(&consumer_data.lock); |
a9838785 | 1038 | pthread_mutex_lock(&channel->lock); |
ec6ea7d0 | 1039 | pthread_mutex_lock(&channel->timer_lock); |
c77fc10a | 1040 | |
b5a6470f DG |
1041 | /* |
1042 | * This gives us a guarantee that the channel we are about to add to the | |
1043 | * channel hash table will be unique. See this function comment on the why | |
1044 | * we need to steel the channel key at this stage. | |
1045 | */ | |
1046 | steal_channel_key(channel->key); | |
c77fc10a | 1047 | |
b5a6470f | 1048 | rcu_read_lock(); |
d88aee68 | 1049 | lttng_ht_add_unique_u64(consumer_data.channel_ht, &channel->node); |
6065ceec | 1050 | rcu_read_unlock(); |
b5a6470f | 1051 | |
ec6ea7d0 | 1052 | pthread_mutex_unlock(&channel->timer_lock); |
a9838785 | 1053 | pthread_mutex_unlock(&channel->lock); |
3bd1e081 | 1054 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 1055 | |
b5a6470f | 1056 | if (channel->wait_fd != -1 && channel->type == CONSUMER_CHANNEL_TYPE_DATA) { |
a0cbdd2e | 1057 | notify_channel_pipe(ctx, channel, -1, CONSUMER_CHANNEL_ADD); |
d8ef542d | 1058 | } |
b5a6470f DG |
1059 | |
1060 | return 0; | |
3bd1e081 MD |
1061 | } |
1062 | ||
1063 | /* | |
1064 | * Allocate the pollfd structure and the local view of the out fds to avoid | |
1065 | * doing a lookup in the linked list and concurrency issues when writing is | |
1066 | * needed. Called with consumer_data.lock held. | |
1067 | * | |
1068 | * Returns the number of fds in the structures. | |
1069 | */ | |
ffe60014 DG |
1070 | static int update_poll_array(struct lttng_consumer_local_data *ctx, |
1071 | struct pollfd **pollfd, struct lttng_consumer_stream **local_stream, | |
1072 | struct lttng_ht *ht) | |
3bd1e081 | 1073 | { |
3bd1e081 | 1074 | int i = 0; |
e4421fec DG |
1075 | struct lttng_ht_iter iter; |
1076 | struct lttng_consumer_stream *stream; | |
3bd1e081 | 1077 | |
ffe60014 DG |
1078 | assert(ctx); |
1079 | assert(ht); | |
1080 | assert(pollfd); | |
1081 | assert(local_stream); | |
1082 | ||
3bd1e081 | 1083 | DBG("Updating poll fd array"); |
481d6c57 | 1084 | rcu_read_lock(); |
43c34bc3 | 1085 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { |
8994307f DG |
1086 | /* |
1087 | * Only active streams with an active end point can be added to the | |
1088 | * poll set and local stream storage of the thread. | |
1089 | * | |
1090 | * There is a potential race here for endpoint_status to be updated | |
1091 | * just after the check. However, this is OK since the stream(s) will | |
1092 | * be deleted once the thread is notified that the end point state has | |
1093 | * changed where this function will be called back again. | |
1094 | */ | |
1095 | if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM || | |
79d4ffb7 | 1096 | stream->endpoint_status == CONSUMER_ENDPOINT_INACTIVE) { |
3bd1e081 MD |
1097 | continue; |
1098 | } | |
7972aab2 DG |
1099 | /* |
1100 | * This clobbers way too much the debug output. Uncomment that if you | |
1101 | * need it for debugging purposes. | |
1102 | * | |
1103 | * DBG("Active FD %d", stream->wait_fd); | |
1104 | */ | |
e4421fec | 1105 | (*pollfd)[i].fd = stream->wait_fd; |
3bd1e081 | 1106 | (*pollfd)[i].events = POLLIN | POLLPRI; |
e4421fec | 1107 | local_stream[i] = stream; |
3bd1e081 MD |
1108 | i++; |
1109 | } | |
481d6c57 | 1110 | rcu_read_unlock(); |
3bd1e081 MD |
1111 | |
1112 | /* | |
50f8ae69 | 1113 | * Insert the consumer_data_pipe at the end of the array and don't |
3bd1e081 MD |
1114 | * increment i so nb_fd is the number of real FD. |
1115 | */ | |
acdb9057 | 1116 | (*pollfd)[i].fd = lttng_pipe_get_readfd(ctx->consumer_data_pipe); |
509bb1cf | 1117 | (*pollfd)[i].events = POLLIN | POLLPRI; |
02b3d176 DG |
1118 | |
1119 | (*pollfd)[i + 1].fd = lttng_pipe_get_readfd(ctx->consumer_wakeup_pipe); | |
1120 | (*pollfd)[i + 1].events = POLLIN | POLLPRI; | |
3bd1e081 MD |
1121 | return i; |
1122 | } | |
1123 | ||
1124 | /* | |
84382d49 MD |
1125 | * Poll on the should_quit pipe and the command socket return -1 on |
1126 | * error, 1 if should exit, 0 if data is available on the command socket | |
3bd1e081 MD |
1127 | */ |
1128 | int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll) | |
1129 | { | |
1130 | int num_rdy; | |
1131 | ||
88f2b785 | 1132 | restart: |
3bd1e081 MD |
1133 | num_rdy = poll(consumer_sockpoll, 2, -1); |
1134 | if (num_rdy == -1) { | |
88f2b785 MD |
1135 | /* |
1136 | * Restart interrupted system call. | |
1137 | */ | |
1138 | if (errno == EINTR) { | |
1139 | goto restart; | |
1140 | } | |
7a57cf92 | 1141 | PERROR("Poll error"); |
84382d49 | 1142 | return -1; |
3bd1e081 | 1143 | } |
509bb1cf | 1144 | if (consumer_sockpoll[0].revents & (POLLIN | POLLPRI)) { |
3bd1e081 | 1145 | DBG("consumer_should_quit wake up"); |
84382d49 | 1146 | return 1; |
3bd1e081 MD |
1147 | } |
1148 | return 0; | |
3bd1e081 MD |
1149 | } |
1150 | ||
1151 | /* | |
1152 | * Set the error socket. | |
1153 | */ | |
ffe60014 DG |
1154 | void lttng_consumer_set_error_sock(struct lttng_consumer_local_data *ctx, |
1155 | int sock) | |
3bd1e081 MD |
1156 | { |
1157 | ctx->consumer_error_socket = sock; | |
1158 | } | |
1159 | ||
1160 | /* | |
1161 | * Set the command socket path. | |
1162 | */ | |
3bd1e081 MD |
1163 | void lttng_consumer_set_command_sock_path( |
1164 | struct lttng_consumer_local_data *ctx, char *sock) | |
1165 | { | |
1166 | ctx->consumer_command_sock_path = sock; | |
1167 | } | |
1168 | ||
1169 | /* | |
1170 | * Send return code to the session daemon. | |
1171 | * If the socket is not defined, we return 0, it is not a fatal error | |
1172 | */ | |
ffe60014 | 1173 | int lttng_consumer_send_error(struct lttng_consumer_local_data *ctx, int cmd) |
3bd1e081 MD |
1174 | { |
1175 | if (ctx->consumer_error_socket > 0) { | |
1176 | return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd, | |
1177 | sizeof(enum lttcomm_sessiond_command)); | |
1178 | } | |
1179 | ||
1180 | return 0; | |
1181 | } | |
1182 | ||
1183 | /* | |
228b5bf7 DG |
1184 | * Close all the tracefiles and stream fds and MUST be called when all |
1185 | * instances are destroyed i.e. when all threads were joined and are ended. | |
3bd1e081 MD |
1186 | */ |
1187 | void lttng_consumer_cleanup(void) | |
1188 | { | |
e4421fec | 1189 | struct lttng_ht_iter iter; |
ffe60014 | 1190 | struct lttng_consumer_channel *channel; |
6065ceec DG |
1191 | |
1192 | rcu_read_lock(); | |
3bd1e081 | 1193 | |
ffe60014 DG |
1194 | cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, channel, |
1195 | node.node) { | |
702b1ea4 | 1196 | consumer_del_channel(channel); |
3bd1e081 | 1197 | } |
6065ceec DG |
1198 | |
1199 | rcu_read_unlock(); | |
d6ce1df2 | 1200 | |
d6ce1df2 | 1201 | lttng_ht_destroy(consumer_data.channel_ht); |
228b5bf7 DG |
1202 | |
1203 | cleanup_relayd_ht(); | |
1204 | ||
d8ef542d MD |
1205 | lttng_ht_destroy(consumer_data.stream_per_chan_id_ht); |
1206 | ||
228b5bf7 DG |
1207 | /* |
1208 | * This HT contains streams that are freed by either the metadata thread or | |
1209 | * the data thread so we do *nothing* on the hash table and simply destroy | |
1210 | * it. | |
1211 | */ | |
1212 | lttng_ht_destroy(consumer_data.stream_list_ht); | |
3bd1e081 MD |
1213 | } |
1214 | ||
1215 | /* | |
1216 | * Called from signal handler. | |
1217 | */ | |
1218 | void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx) | |
1219 | { | |
6cd525e8 MD |
1220 | ssize_t ret; |
1221 | ||
3bd1e081 | 1222 | consumer_quit = 1; |
6cd525e8 MD |
1223 | ret = lttng_write(ctx->consumer_should_quit[1], "4", 1); |
1224 | if (ret < 1) { | |
7a57cf92 | 1225 | PERROR("write consumer quit"); |
3bd1e081 | 1226 | } |
ab1027f4 DG |
1227 | |
1228 | DBG("Consumer flag that it should quit"); | |
3bd1e081 MD |
1229 | } |
1230 | ||
00e2e675 DG |
1231 | void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream, |
1232 | off_t orig_offset) | |
3bd1e081 MD |
1233 | { |
1234 | int outfd = stream->out_fd; | |
1235 | ||
1236 | /* | |
1237 | * This does a blocking write-and-wait on any page that belongs to the | |
1238 | * subbuffer prior to the one we just wrote. | |
1239 | * Don't care about error values, as these are just hints and ways to | |
1240 | * limit the amount of page cache used. | |
1241 | */ | |
ffe60014 | 1242 | if (orig_offset < stream->max_sb_size) { |
3bd1e081 MD |
1243 | return; |
1244 | } | |
ffe60014 DG |
1245 | lttng_sync_file_range(outfd, orig_offset - stream->max_sb_size, |
1246 | stream->max_sb_size, | |
3bd1e081 MD |
1247 | SYNC_FILE_RANGE_WAIT_BEFORE |
1248 | | SYNC_FILE_RANGE_WRITE | |
1249 | | SYNC_FILE_RANGE_WAIT_AFTER); | |
1250 | /* | |
1251 | * Give hints to the kernel about how we access the file: | |
1252 | * POSIX_FADV_DONTNEED : we won't re-access data in a near future after | |
1253 | * we write it. | |
1254 | * | |
1255 | * We need to call fadvise again after the file grows because the | |
1256 | * kernel does not seem to apply fadvise to non-existing parts of the | |
1257 | * file. | |
1258 | * | |
1259 | * Call fadvise _after_ having waited for the page writeback to | |
1260 | * complete because the dirty page writeback semantic is not well | |
1261 | * defined. So it can be expected to lead to lower throughput in | |
1262 | * streaming. | |
1263 | */ | |
ffe60014 DG |
1264 | posix_fadvise(outfd, orig_offset - stream->max_sb_size, |
1265 | stream->max_sb_size, POSIX_FADV_DONTNEED); | |
3bd1e081 MD |
1266 | } |
1267 | ||
1268 | /* | |
1269 | * Initialise the necessary environnement : | |
1270 | * - create a new context | |
1271 | * - create the poll_pipe | |
1272 | * - create the should_quit pipe (for signal handler) | |
1273 | * - create the thread pipe (for splice) | |
1274 | * | |
1275 | * Takes a function pointer as argument, this function is called when data is | |
1276 | * available on a buffer. This function is responsible to do the | |
1277 | * kernctl_get_next_subbuf, read the data with mmap or splice depending on the | |
1278 | * buffer configuration and then kernctl_put_next_subbuf at the end. | |
1279 | * | |
1280 | * Returns a pointer to the new context or NULL on error. | |
1281 | */ | |
1282 | struct lttng_consumer_local_data *lttng_consumer_create( | |
1283 | enum lttng_consumer_type type, | |
4078b776 | 1284 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
d41f73b7 | 1285 | struct lttng_consumer_local_data *ctx), |
3bd1e081 MD |
1286 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
1287 | int (*recv_stream)(struct lttng_consumer_stream *stream), | |
30319bcb | 1288 | int (*update_stream)(uint64_t stream_key, uint32_t state)) |
3bd1e081 | 1289 | { |
d8ef542d | 1290 | int ret; |
3bd1e081 MD |
1291 | struct lttng_consumer_local_data *ctx; |
1292 | ||
1293 | assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN || | |
1294 | consumer_data.type == type); | |
1295 | consumer_data.type = type; | |
1296 | ||
effcf122 | 1297 | ctx = zmalloc(sizeof(struct lttng_consumer_local_data)); |
3bd1e081 | 1298 | if (ctx == NULL) { |
7a57cf92 | 1299 | PERROR("allocating context"); |
3bd1e081 MD |
1300 | goto error; |
1301 | } | |
1302 | ||
1303 | ctx->consumer_error_socket = -1; | |
331744e3 | 1304 | ctx->consumer_metadata_socket = -1; |
75d83e50 | 1305 | pthread_mutex_init(&ctx->metadata_socket_lock, NULL); |
3bd1e081 MD |
1306 | /* assign the callbacks */ |
1307 | ctx->on_buffer_ready = buffer_ready; | |
1308 | ctx->on_recv_channel = recv_channel; | |
1309 | ctx->on_recv_stream = recv_stream; | |
1310 | ctx->on_update_stream = update_stream; | |
1311 | ||
acdb9057 DG |
1312 | ctx->consumer_data_pipe = lttng_pipe_open(0); |
1313 | if (!ctx->consumer_data_pipe) { | |
3bd1e081 MD |
1314 | goto error_poll_pipe; |
1315 | } | |
1316 | ||
02b3d176 DG |
1317 | ctx->consumer_wakeup_pipe = lttng_pipe_open(0); |
1318 | if (!ctx->consumer_wakeup_pipe) { | |
1319 | goto error_wakeup_pipe; | |
1320 | } | |
1321 | ||
3bd1e081 MD |
1322 | ret = pipe(ctx->consumer_should_quit); |
1323 | if (ret < 0) { | |
7a57cf92 | 1324 | PERROR("Error creating recv pipe"); |
3bd1e081 MD |
1325 | goto error_quit_pipe; |
1326 | } | |
1327 | ||
d8ef542d MD |
1328 | ret = pipe(ctx->consumer_channel_pipe); |
1329 | if (ret < 0) { | |
1330 | PERROR("Error creating channel pipe"); | |
1331 | goto error_channel_pipe; | |
1332 | } | |
1333 | ||
13886d2d DG |
1334 | ctx->consumer_metadata_pipe = lttng_pipe_open(0); |
1335 | if (!ctx->consumer_metadata_pipe) { | |
fb3a43a9 DG |
1336 | goto error_metadata_pipe; |
1337 | } | |
3bd1e081 | 1338 | |
fb3a43a9 | 1339 | return ctx; |
3bd1e081 | 1340 | |
fb3a43a9 | 1341 | error_metadata_pipe: |
d8ef542d MD |
1342 | utils_close_pipe(ctx->consumer_channel_pipe); |
1343 | error_channel_pipe: | |
d8ef542d | 1344 | utils_close_pipe(ctx->consumer_should_quit); |
3bd1e081 | 1345 | error_quit_pipe: |
02b3d176 DG |
1346 | lttng_pipe_destroy(ctx->consumer_wakeup_pipe); |
1347 | error_wakeup_pipe: | |
acdb9057 | 1348 | lttng_pipe_destroy(ctx->consumer_data_pipe); |
3bd1e081 MD |
1349 | error_poll_pipe: |
1350 | free(ctx); | |
1351 | error: | |
1352 | return NULL; | |
1353 | } | |
1354 | ||
282dadbc MD |
1355 | /* |
1356 | * Iterate over all streams of the hashtable and free them properly. | |
1357 | */ | |
1358 | static void destroy_data_stream_ht(struct lttng_ht *ht) | |
1359 | { | |
1360 | struct lttng_ht_iter iter; | |
1361 | struct lttng_consumer_stream *stream; | |
1362 | ||
1363 | if (ht == NULL) { | |
1364 | return; | |
1365 | } | |
1366 | ||
1367 | rcu_read_lock(); | |
1368 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { | |
1369 | /* | |
1370 | * Ignore return value since we are currently cleaning up so any error | |
1371 | * can't be handled. | |
1372 | */ | |
1373 | (void) consumer_del_stream(stream, ht); | |
1374 | } | |
1375 | rcu_read_unlock(); | |
1376 | ||
1377 | lttng_ht_destroy(ht); | |
1378 | } | |
1379 | ||
1380 | /* | |
1381 | * Iterate over all streams of the metadata hashtable and free them | |
1382 | * properly. | |
1383 | */ | |
1384 | static void destroy_metadata_stream_ht(struct lttng_ht *ht) | |
1385 | { | |
1386 | struct lttng_ht_iter iter; | |
1387 | struct lttng_consumer_stream *stream; | |
1388 | ||
1389 | if (ht == NULL) { | |
1390 | return; | |
1391 | } | |
1392 | ||
1393 | rcu_read_lock(); | |
1394 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { | |
1395 | /* | |
1396 | * Ignore return value since we are currently cleaning up so any error | |
1397 | * can't be handled. | |
1398 | */ | |
1399 | (void) consumer_del_metadata_stream(stream, ht); | |
1400 | } | |
1401 | rcu_read_unlock(); | |
1402 | ||
1403 | lttng_ht_destroy(ht); | |
1404 | } | |
1405 | ||
3bd1e081 MD |
1406 | /* |
1407 | * Close all fds associated with the instance and free the context. | |
1408 | */ | |
1409 | void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx) | |
1410 | { | |
4c462e79 MD |
1411 | int ret; |
1412 | ||
ab1027f4 DG |
1413 | DBG("Consumer destroying it. Closing everything."); |
1414 | ||
4f2e75b9 DG |
1415 | if (!ctx) { |
1416 | return; | |
1417 | } | |
1418 | ||
282dadbc MD |
1419 | destroy_data_stream_ht(data_ht); |
1420 | destroy_metadata_stream_ht(metadata_ht); | |
1421 | ||
4c462e79 MD |
1422 | ret = close(ctx->consumer_error_socket); |
1423 | if (ret) { | |
1424 | PERROR("close"); | |
1425 | } | |
331744e3 JD |
1426 | ret = close(ctx->consumer_metadata_socket); |
1427 | if (ret) { | |
1428 | PERROR("close"); | |
1429 | } | |
d8ef542d | 1430 | utils_close_pipe(ctx->consumer_channel_pipe); |
acdb9057 | 1431 | lttng_pipe_destroy(ctx->consumer_data_pipe); |
13886d2d | 1432 | lttng_pipe_destroy(ctx->consumer_metadata_pipe); |
02b3d176 | 1433 | lttng_pipe_destroy(ctx->consumer_wakeup_pipe); |
d8ef542d | 1434 | utils_close_pipe(ctx->consumer_should_quit); |
fb3a43a9 | 1435 | |
3bd1e081 MD |
1436 | unlink(ctx->consumer_command_sock_path); |
1437 | free(ctx); | |
1438 | } | |
1439 | ||
6197aea7 DG |
1440 | /* |
1441 | * Write the metadata stream id on the specified file descriptor. | |
1442 | */ | |
1443 | static int write_relayd_metadata_id(int fd, | |
1444 | struct lttng_consumer_stream *stream, | |
ffe60014 | 1445 | struct consumer_relayd_sock_pair *relayd, unsigned long padding) |
6197aea7 | 1446 | { |
6cd525e8 | 1447 | ssize_t ret; |
1d4dfdef | 1448 | struct lttcomm_relayd_metadata_payload hdr; |
6197aea7 | 1449 | |
1d4dfdef DG |
1450 | hdr.stream_id = htobe64(stream->relayd_stream_id); |
1451 | hdr.padding_size = htobe32(padding); | |
6cd525e8 MD |
1452 | ret = lttng_write(fd, (void *) &hdr, sizeof(hdr)); |
1453 | if (ret < sizeof(hdr)) { | |
d7b75ec8 | 1454 | /* |
6f04ed72 | 1455 | * This error means that the fd's end is closed so ignore the PERROR |
d7b75ec8 DG |
1456 | * not to clubber the error output since this can happen in a normal |
1457 | * code path. | |
1458 | */ | |
1459 | if (errno != EPIPE) { | |
1460 | PERROR("write metadata stream id"); | |
1461 | } | |
1462 | DBG3("Consumer failed to write relayd metadata id (errno: %d)", errno); | |
534d2592 DG |
1463 | /* |
1464 | * Set ret to a negative value because if ret != sizeof(hdr), we don't | |
1465 | * handle writting the missing part so report that as an error and | |
1466 | * don't lie to the caller. | |
1467 | */ | |
1468 | ret = -1; | |
6197aea7 DG |
1469 | goto end; |
1470 | } | |
1d4dfdef DG |
1471 | DBG("Metadata stream id %" PRIu64 " with padding %lu written before data", |
1472 | stream->relayd_stream_id, padding); | |
6197aea7 DG |
1473 | |
1474 | end: | |
6cd525e8 | 1475 | return (int) ret; |
6197aea7 DG |
1476 | } |
1477 | ||
3bd1e081 | 1478 | /* |
09e26845 DG |
1479 | * Mmap the ring buffer, read it and write the data to the tracefile. This is a |
1480 | * core function for writing trace buffers to either the local filesystem or | |
1481 | * the network. | |
1482 | * | |
79d4ffb7 DG |
1483 | * It must be called with the stream lock held. |
1484 | * | |
09e26845 | 1485 | * Careful review MUST be put if any changes occur! |
3bd1e081 MD |
1486 | * |
1487 | * Returns the number of bytes written | |
1488 | */ | |
4078b776 | 1489 | ssize_t lttng_consumer_on_read_subbuffer_mmap( |
3bd1e081 | 1490 | struct lttng_consumer_local_data *ctx, |
1d4dfdef | 1491 | struct lttng_consumer_stream *stream, unsigned long len, |
309167d2 | 1492 | unsigned long padding, |
50adc264 | 1493 | struct ctf_packet_index *index) |
3bd1e081 | 1494 | { |
f02e1e8a | 1495 | unsigned long mmap_offset; |
ffe60014 | 1496 | void *mmap_base; |
994ab360 | 1497 | ssize_t ret = 0; |
f02e1e8a DG |
1498 | off_t orig_offset = stream->out_fd_offset; |
1499 | /* Default is on the disk */ | |
1500 | int outfd = stream->out_fd; | |
f02e1e8a | 1501 | struct consumer_relayd_sock_pair *relayd = NULL; |
8994307f | 1502 | unsigned int relayd_hang_up = 0; |
f02e1e8a DG |
1503 | |
1504 | /* RCU lock for the relayd pointer */ | |
1505 | rcu_read_lock(); | |
1506 | ||
1507 | /* Flag that the current stream if set for network streaming. */ | |
da009f2c | 1508 | if (stream->net_seq_idx != (uint64_t) -1ULL) { |
f02e1e8a DG |
1509 | relayd = consumer_find_relayd(stream->net_seq_idx); |
1510 | if (relayd == NULL) { | |
56591bac | 1511 | ret = -EPIPE; |
f02e1e8a DG |
1512 | goto end; |
1513 | } | |
1514 | } | |
1515 | ||
1516 | /* get the offset inside the fd to mmap */ | |
3bd1e081 MD |
1517 | switch (consumer_data.type) { |
1518 | case LTTNG_CONSUMER_KERNEL: | |
ffe60014 | 1519 | mmap_base = stream->mmap_base; |
f02e1e8a | 1520 | ret = kernctl_get_mmap_read_offset(stream->wait_fd, &mmap_offset); |
994ab360 DG |
1521 | if (ret < 0) { |
1522 | ret = -errno; | |
56591bac | 1523 | PERROR("tracer ctl get_mmap_read_offset"); |
56591bac MD |
1524 | goto end; |
1525 | } | |
f02e1e8a | 1526 | break; |
7753dea8 MD |
1527 | case LTTNG_CONSUMER32_UST: |
1528 | case LTTNG_CONSUMER64_UST: | |
ffe60014 DG |
1529 | mmap_base = lttng_ustctl_get_mmap_base(stream); |
1530 | if (!mmap_base) { | |
1531 | ERR("read mmap get mmap base for stream %s", stream->name); | |
994ab360 | 1532 | ret = -EPERM; |
ffe60014 DG |
1533 | goto end; |
1534 | } | |
1535 | ret = lttng_ustctl_get_mmap_read_offset(stream, &mmap_offset); | |
56591bac MD |
1536 | if (ret != 0) { |
1537 | PERROR("tracer ctl get_mmap_read_offset"); | |
994ab360 | 1538 | ret = -EINVAL; |
56591bac MD |
1539 | goto end; |
1540 | } | |
f02e1e8a | 1541 | break; |
3bd1e081 MD |
1542 | default: |
1543 | ERR("Unknown consumer_data type"); | |
1544 | assert(0); | |
1545 | } | |
b9182dd9 | 1546 | |
f02e1e8a DG |
1547 | /* Handle stream on the relayd if the output is on the network */ |
1548 | if (relayd) { | |
1549 | unsigned long netlen = len; | |
1550 | ||
1551 | /* | |
1552 | * Lock the control socket for the complete duration of the function | |
1553 | * since from this point on we will use the socket. | |
1554 | */ | |
1555 | if (stream->metadata_flag) { | |
1556 | /* Metadata requires the control socket. */ | |
1557 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1d4dfdef | 1558 | netlen += sizeof(struct lttcomm_relayd_metadata_payload); |
f02e1e8a DG |
1559 | } |
1560 | ||
1d4dfdef | 1561 | ret = write_relayd_stream_header(stream, netlen, padding, relayd); |
994ab360 DG |
1562 | if (ret < 0) { |
1563 | relayd_hang_up = 1; | |
1564 | goto write_error; | |
1565 | } | |
1566 | /* Use the returned socket. */ | |
1567 | outfd = ret; | |
f02e1e8a | 1568 | |
994ab360 DG |
1569 | /* Write metadata stream id before payload */ |
1570 | if (stream->metadata_flag) { | |
1571 | ret = write_relayd_metadata_id(outfd, stream, relayd, padding); | |
1572 | if (ret < 0) { | |
8994307f DG |
1573 | relayd_hang_up = 1; |
1574 | goto write_error; | |
1575 | } | |
f02e1e8a | 1576 | } |
1d4dfdef DG |
1577 | } else { |
1578 | /* No streaming, we have to set the len with the full padding */ | |
1579 | len += padding; | |
1624d5b7 JD |
1580 | |
1581 | /* | |
1582 | * Check if we need to change the tracefile before writing the packet. | |
1583 | */ | |
1584 | if (stream->chan->tracefile_size > 0 && | |
1585 | (stream->tracefile_size_current + len) > | |
1586 | stream->chan->tracefile_size) { | |
fe4477ee JD |
1587 | ret = utils_rotate_stream_file(stream->chan->pathname, |
1588 | stream->name, stream->chan->tracefile_size, | |
1589 | stream->chan->tracefile_count, stream->uid, stream->gid, | |
309167d2 JD |
1590 | stream->out_fd, &(stream->tracefile_count_current), |
1591 | &stream->out_fd); | |
1624d5b7 JD |
1592 | if (ret < 0) { |
1593 | ERR("Rotating output file"); | |
1594 | goto end; | |
1595 | } | |
309167d2 JD |
1596 | outfd = stream->out_fd; |
1597 | ||
1598 | if (stream->index_fd >= 0) { | |
adf7a0a1 JG |
1599 | ret = close(stream->index_fd); |
1600 | if (ret < 0) { | |
1601 | PERROR("Closing index"); | |
1602 | goto end; | |
1603 | } | |
1604 | stream->index_fd = -1; | |
309167d2 JD |
1605 | ret = index_create_file(stream->chan->pathname, |
1606 | stream->name, stream->uid, stream->gid, | |
1607 | stream->chan->tracefile_size, | |
1608 | stream->tracefile_count_current); | |
1609 | if (ret < 0) { | |
1610 | goto end; | |
1611 | } | |
1612 | stream->index_fd = ret; | |
1613 | } | |
1614 | ||
a6976990 DG |
1615 | /* Reset current size because we just perform a rotation. */ |
1616 | stream->tracefile_size_current = 0; | |
a1ae300f JD |
1617 | stream->out_fd_offset = 0; |
1618 | orig_offset = 0; | |
1624d5b7 JD |
1619 | } |
1620 | stream->tracefile_size_current += len; | |
309167d2 JD |
1621 | if (index) { |
1622 | index->offset = htobe64(stream->out_fd_offset); | |
1623 | } | |
f02e1e8a DG |
1624 | } |
1625 | ||
d02b8372 DG |
1626 | /* |
1627 | * This call guarantee that len or less is returned. It's impossible to | |
1628 | * receive a ret value that is bigger than len. | |
1629 | */ | |
1630 | ret = lttng_write(outfd, mmap_base + mmap_offset, len); | |
1631 | DBG("Consumer mmap write() ret %zd (len %lu)", ret, len); | |
1632 | if (ret < 0 || ((size_t) ret != len)) { | |
1633 | /* | |
1634 | * Report error to caller if nothing was written else at least send the | |
1635 | * amount written. | |
1636 | */ | |
1637 | if (ret < 0) { | |
994ab360 | 1638 | ret = -errno; |
f02e1e8a | 1639 | } |
994ab360 | 1640 | relayd_hang_up = 1; |
f02e1e8a | 1641 | |
d02b8372 | 1642 | /* Socket operation failed. We consider the relayd dead */ |
994ab360 | 1643 | if (errno == EPIPE || errno == EINVAL || errno == EBADF) { |
d02b8372 DG |
1644 | /* |
1645 | * This is possible if the fd is closed on the other side | |
1646 | * (outfd) or any write problem. It can be verbose a bit for a | |
1647 | * normal execution if for instance the relayd is stopped | |
1648 | * abruptly. This can happen so set this to a DBG statement. | |
1649 | */ | |
1650 | DBG("Consumer mmap write detected relayd hang up"); | |
994ab360 DG |
1651 | } else { |
1652 | /* Unhandled error, print it and stop function right now. */ | |
1653 | PERROR("Error in write mmap (ret %zd != len %lu)", ret, len); | |
f02e1e8a | 1654 | } |
994ab360 | 1655 | goto write_error; |
d02b8372 DG |
1656 | } |
1657 | stream->output_written += ret; | |
d02b8372 DG |
1658 | |
1659 | /* This call is useless on a socket so better save a syscall. */ | |
1660 | if (!relayd) { | |
1661 | /* This won't block, but will start writeout asynchronously */ | |
1662 | lttng_sync_file_range(outfd, stream->out_fd_offset, len, | |
1663 | SYNC_FILE_RANGE_WRITE); | |
1664 | stream->out_fd_offset += len; | |
f02e1e8a DG |
1665 | } |
1666 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
1667 | ||
8994307f DG |
1668 | write_error: |
1669 | /* | |
1670 | * This is a special case that the relayd has closed its socket. Let's | |
1671 | * cleanup the relayd object and all associated streams. | |
1672 | */ | |
1673 | if (relayd && relayd_hang_up) { | |
1674 | cleanup_relayd(relayd, ctx); | |
1675 | } | |
1676 | ||
f02e1e8a DG |
1677 | end: |
1678 | /* Unlock only if ctrl socket used */ | |
1679 | if (relayd && stream->metadata_flag) { | |
1680 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1681 | } | |
1682 | ||
1683 | rcu_read_unlock(); | |
994ab360 | 1684 | return ret; |
3bd1e081 MD |
1685 | } |
1686 | ||
1687 | /* | |
1688 | * Splice the data from the ring buffer to the tracefile. | |
1689 | * | |
79d4ffb7 DG |
1690 | * It must be called with the stream lock held. |
1691 | * | |
3bd1e081 MD |
1692 | * Returns the number of bytes spliced. |
1693 | */ | |
4078b776 | 1694 | ssize_t lttng_consumer_on_read_subbuffer_splice( |
3bd1e081 | 1695 | struct lttng_consumer_local_data *ctx, |
1d4dfdef | 1696 | struct lttng_consumer_stream *stream, unsigned long len, |
309167d2 | 1697 | unsigned long padding, |
50adc264 | 1698 | struct ctf_packet_index *index) |
3bd1e081 | 1699 | { |
f02e1e8a DG |
1700 | ssize_t ret = 0, written = 0, ret_splice = 0; |
1701 | loff_t offset = 0; | |
1702 | off_t orig_offset = stream->out_fd_offset; | |
1703 | int fd = stream->wait_fd; | |
1704 | /* Default is on the disk */ | |
1705 | int outfd = stream->out_fd; | |
f02e1e8a | 1706 | struct consumer_relayd_sock_pair *relayd = NULL; |
fb3a43a9 | 1707 | int *splice_pipe; |
8994307f | 1708 | unsigned int relayd_hang_up = 0; |
f02e1e8a | 1709 | |
3bd1e081 MD |
1710 | switch (consumer_data.type) { |
1711 | case LTTNG_CONSUMER_KERNEL: | |
f02e1e8a | 1712 | break; |
7753dea8 MD |
1713 | case LTTNG_CONSUMER32_UST: |
1714 | case LTTNG_CONSUMER64_UST: | |
f02e1e8a | 1715 | /* Not supported for user space tracing */ |
3bd1e081 MD |
1716 | return -ENOSYS; |
1717 | default: | |
1718 | ERR("Unknown consumer_data type"); | |
1719 | assert(0); | |
3bd1e081 MD |
1720 | } |
1721 | ||
f02e1e8a DG |
1722 | /* RCU lock for the relayd pointer */ |
1723 | rcu_read_lock(); | |
1724 | ||
1725 | /* Flag that the current stream if set for network streaming. */ | |
da009f2c | 1726 | if (stream->net_seq_idx != (uint64_t) -1ULL) { |
f02e1e8a DG |
1727 | relayd = consumer_find_relayd(stream->net_seq_idx); |
1728 | if (relayd == NULL) { | |
ad0b0d23 | 1729 | written = -ret; |
f02e1e8a DG |
1730 | goto end; |
1731 | } | |
1732 | } | |
a2361a61 | 1733 | splice_pipe = stream->splice_pipe; |
fb3a43a9 | 1734 | |
f02e1e8a | 1735 | /* Write metadata stream id before payload */ |
1d4dfdef | 1736 | if (relayd) { |
ad0b0d23 | 1737 | unsigned long total_len = len; |
f02e1e8a | 1738 | |
1d4dfdef DG |
1739 | if (stream->metadata_flag) { |
1740 | /* | |
1741 | * Lock the control socket for the complete duration of the function | |
1742 | * since from this point on we will use the socket. | |
1743 | */ | |
1744 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1745 | ||
1746 | ret = write_relayd_metadata_id(splice_pipe[1], stream, relayd, | |
1747 | padding); | |
1748 | if (ret < 0) { | |
1749 | written = ret; | |
ad0b0d23 DG |
1750 | relayd_hang_up = 1; |
1751 | goto write_error; | |
1d4dfdef DG |
1752 | } |
1753 | ||
1754 | total_len += sizeof(struct lttcomm_relayd_metadata_payload); | |
1755 | } | |
1756 | ||
1757 | ret = write_relayd_stream_header(stream, total_len, padding, relayd); | |
ad0b0d23 DG |
1758 | if (ret < 0) { |
1759 | written = ret; | |
1760 | relayd_hang_up = 1; | |
1761 | goto write_error; | |
f02e1e8a | 1762 | } |
ad0b0d23 DG |
1763 | /* Use the returned socket. */ |
1764 | outfd = ret; | |
1d4dfdef DG |
1765 | } else { |
1766 | /* No streaming, we have to set the len with the full padding */ | |
1767 | len += padding; | |
1624d5b7 JD |
1768 | |
1769 | /* | |
1770 | * Check if we need to change the tracefile before writing the packet. | |
1771 | */ | |
1772 | if (stream->chan->tracefile_size > 0 && | |
1773 | (stream->tracefile_size_current + len) > | |
1774 | stream->chan->tracefile_size) { | |
fe4477ee JD |
1775 | ret = utils_rotate_stream_file(stream->chan->pathname, |
1776 | stream->name, stream->chan->tracefile_size, | |
1777 | stream->chan->tracefile_count, stream->uid, stream->gid, | |
309167d2 JD |
1778 | stream->out_fd, &(stream->tracefile_count_current), |
1779 | &stream->out_fd); | |
1624d5b7 | 1780 | if (ret < 0) { |
ad0b0d23 | 1781 | written = ret; |
1624d5b7 JD |
1782 | ERR("Rotating output file"); |
1783 | goto end; | |
1784 | } | |
309167d2 JD |
1785 | outfd = stream->out_fd; |
1786 | ||
1787 | if (stream->index_fd >= 0) { | |
3c1150e1 JD |
1788 | ret = close(stream->index_fd); |
1789 | if (ret < 0) { | |
1790 | PERROR("Closing index"); | |
1791 | goto end; | |
1792 | } | |
1793 | stream->index_fd = -1; | |
309167d2 JD |
1794 | ret = index_create_file(stream->chan->pathname, |
1795 | stream->name, stream->uid, stream->gid, | |
1796 | stream->chan->tracefile_size, | |
1797 | stream->tracefile_count_current); | |
1798 | if (ret < 0) { | |
ad0b0d23 | 1799 | written = ret; |
309167d2 JD |
1800 | goto end; |
1801 | } | |
1802 | stream->index_fd = ret; | |
1803 | } | |
1804 | ||
a6976990 DG |
1805 | /* Reset current size because we just perform a rotation. */ |
1806 | stream->tracefile_size_current = 0; | |
a1ae300f JD |
1807 | stream->out_fd_offset = 0; |
1808 | orig_offset = 0; | |
1624d5b7 JD |
1809 | } |
1810 | stream->tracefile_size_current += len; | |
309167d2 | 1811 | index->offset = htobe64(stream->out_fd_offset); |
f02e1e8a DG |
1812 | } |
1813 | ||
1814 | while (len > 0) { | |
1d4dfdef DG |
1815 | DBG("splice chan to pipe offset %lu of len %lu (fd : %d, pipe: %d)", |
1816 | (unsigned long)offset, len, fd, splice_pipe[1]); | |
fb3a43a9 | 1817 | ret_splice = splice(fd, &offset, splice_pipe[1], NULL, len, |
f02e1e8a DG |
1818 | SPLICE_F_MOVE | SPLICE_F_MORE); |
1819 | DBG("splice chan to pipe, ret %zd", ret_splice); | |
1820 | if (ret_splice < 0) { | |
d02b8372 | 1821 | ret = errno; |
ad0b0d23 | 1822 | written = -ret; |
d02b8372 | 1823 | PERROR("Error in relay splice"); |
f02e1e8a DG |
1824 | goto splice_error; |
1825 | } | |
1826 | ||
1827 | /* Handle stream on the relayd if the output is on the network */ | |
ad0b0d23 DG |
1828 | if (relayd && stream->metadata_flag) { |
1829 | size_t metadata_payload_size = | |
1830 | sizeof(struct lttcomm_relayd_metadata_payload); | |
1831 | ||
1832 | /* Update counter to fit the spliced data */ | |
1833 | ret_splice += metadata_payload_size; | |
1834 | len += metadata_payload_size; | |
1835 | /* | |
1836 | * We do this so the return value can match the len passed as | |
1837 | * argument to this function. | |
1838 | */ | |
1839 | written -= metadata_payload_size; | |
f02e1e8a DG |
1840 | } |
1841 | ||
1842 | /* Splice data out */ | |
fb3a43a9 | 1843 | ret_splice = splice(splice_pipe[0], NULL, outfd, NULL, |
f02e1e8a | 1844 | ret_splice, SPLICE_F_MOVE | SPLICE_F_MORE); |
a2361a61 JD |
1845 | DBG("Consumer splice pipe to file (out_fd: %d), ret %zd", |
1846 | outfd, ret_splice); | |
f02e1e8a | 1847 | if (ret_splice < 0) { |
d02b8372 | 1848 | ret = errno; |
ad0b0d23 DG |
1849 | written = -ret; |
1850 | relayd_hang_up = 1; | |
1851 | goto write_error; | |
f02e1e8a | 1852 | } else if (ret_splice > len) { |
d02b8372 DG |
1853 | /* |
1854 | * We don't expect this code path to be executed but you never know | |
1855 | * so this is an extra protection agains a buggy splice(). | |
1856 | */ | |
f02e1e8a | 1857 | ret = errno; |
ad0b0d23 | 1858 | written += ret_splice; |
d02b8372 DG |
1859 | PERROR("Wrote more data than requested %zd (len: %lu)", ret_splice, |
1860 | len); | |
f02e1e8a | 1861 | goto splice_error; |
d02b8372 DG |
1862 | } else { |
1863 | /* All good, update current len and continue. */ | |
1864 | len -= ret_splice; | |
f02e1e8a | 1865 | } |
f02e1e8a DG |
1866 | |
1867 | /* This call is useless on a socket so better save a syscall. */ | |
1868 | if (!relayd) { | |
1869 | /* This won't block, but will start writeout asynchronously */ | |
1870 | lttng_sync_file_range(outfd, stream->out_fd_offset, ret_splice, | |
1871 | SYNC_FILE_RANGE_WRITE); | |
1872 | stream->out_fd_offset += ret_splice; | |
1873 | } | |
e5d1a9b3 | 1874 | stream->output_written += ret_splice; |
f02e1e8a DG |
1875 | written += ret_splice; |
1876 | } | |
1877 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
f02e1e8a DG |
1878 | goto end; |
1879 | ||
8994307f DG |
1880 | write_error: |
1881 | /* | |
1882 | * This is a special case that the relayd has closed its socket. Let's | |
1883 | * cleanup the relayd object and all associated streams. | |
1884 | */ | |
1885 | if (relayd && relayd_hang_up) { | |
1886 | cleanup_relayd(relayd, ctx); | |
1887 | /* Skip splice error so the consumer does not fail */ | |
1888 | goto end; | |
1889 | } | |
1890 | ||
f02e1e8a DG |
1891 | splice_error: |
1892 | /* send the appropriate error description to sessiond */ | |
1893 | switch (ret) { | |
f02e1e8a | 1894 | case EINVAL: |
f73fabfd | 1895 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_EINVAL); |
f02e1e8a DG |
1896 | break; |
1897 | case ENOMEM: | |
f73fabfd | 1898 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ENOMEM); |
f02e1e8a DG |
1899 | break; |
1900 | case ESPIPE: | |
f73fabfd | 1901 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ESPIPE); |
f02e1e8a DG |
1902 | break; |
1903 | } | |
1904 | ||
1905 | end: | |
1906 | if (relayd && stream->metadata_flag) { | |
1907 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1908 | } | |
1909 | ||
1910 | rcu_read_unlock(); | |
1911 | return written; | |
3bd1e081 MD |
1912 | } |
1913 | ||
1914 | /* | |
1915 | * Take a snapshot for a specific fd | |
1916 | * | |
1917 | * Returns 0 on success, < 0 on error | |
1918 | */ | |
ffe60014 | 1919 | int lttng_consumer_take_snapshot(struct lttng_consumer_stream *stream) |
3bd1e081 MD |
1920 | { |
1921 | switch (consumer_data.type) { | |
1922 | case LTTNG_CONSUMER_KERNEL: | |
ffe60014 | 1923 | return lttng_kconsumer_take_snapshot(stream); |
7753dea8 MD |
1924 | case LTTNG_CONSUMER32_UST: |
1925 | case LTTNG_CONSUMER64_UST: | |
ffe60014 | 1926 | return lttng_ustconsumer_take_snapshot(stream); |
3bd1e081 MD |
1927 | default: |
1928 | ERR("Unknown consumer_data type"); | |
1929 | assert(0); | |
1930 | return -ENOSYS; | |
1931 | } | |
3bd1e081 MD |
1932 | } |
1933 | ||
1934 | /* | |
1935 | * Get the produced position | |
1936 | * | |
1937 | * Returns 0 on success, < 0 on error | |
1938 | */ | |
ffe60014 | 1939 | int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream *stream, |
3bd1e081 MD |
1940 | unsigned long *pos) |
1941 | { | |
1942 | switch (consumer_data.type) { | |
1943 | case LTTNG_CONSUMER_KERNEL: | |
ffe60014 | 1944 | return lttng_kconsumer_get_produced_snapshot(stream, pos); |
7753dea8 MD |
1945 | case LTTNG_CONSUMER32_UST: |
1946 | case LTTNG_CONSUMER64_UST: | |
ffe60014 | 1947 | return lttng_ustconsumer_get_produced_snapshot(stream, pos); |
3bd1e081 MD |
1948 | default: |
1949 | ERR("Unknown consumer_data type"); | |
1950 | assert(0); | |
1951 | return -ENOSYS; | |
1952 | } | |
1953 | } | |
1954 | ||
1955 | int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, | |
1956 | int sock, struct pollfd *consumer_sockpoll) | |
1957 | { | |
1958 | switch (consumer_data.type) { | |
1959 | case LTTNG_CONSUMER_KERNEL: | |
1960 | return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
7753dea8 MD |
1961 | case LTTNG_CONSUMER32_UST: |
1962 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1963 | return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll); |
1964 | default: | |
1965 | ERR("Unknown consumer_data type"); | |
1966 | assert(0); | |
1967 | return -ENOSYS; | |
1968 | } | |
1969 | } | |
1970 | ||
6d574024 | 1971 | void lttng_consumer_close_all_metadata(void) |
d88aee68 DG |
1972 | { |
1973 | switch (consumer_data.type) { | |
1974 | case LTTNG_CONSUMER_KERNEL: | |
1975 | /* | |
1976 | * The Kernel consumer has a different metadata scheme so we don't | |
1977 | * close anything because the stream will be closed by the session | |
1978 | * daemon. | |
1979 | */ | |
1980 | break; | |
1981 | case LTTNG_CONSUMER32_UST: | |
1982 | case LTTNG_CONSUMER64_UST: | |
1983 | /* | |
1984 | * Close all metadata streams. The metadata hash table is passed and | |
1985 | * this call iterates over it by closing all wakeup fd. This is safe | |
1986 | * because at this point we are sure that the metadata producer is | |
1987 | * either dead or blocked. | |
1988 | */ | |
6d574024 | 1989 | lttng_ustconsumer_close_all_metadata(metadata_ht); |
d88aee68 DG |
1990 | break; |
1991 | default: | |
1992 | ERR("Unknown consumer_data type"); | |
1993 | assert(0); | |
1994 | } | |
1995 | } | |
1996 | ||
fb3a43a9 DG |
1997 | /* |
1998 | * Clean up a metadata stream and free its memory. | |
1999 | */ | |
e316aad5 DG |
2000 | void consumer_del_metadata_stream(struct lttng_consumer_stream *stream, |
2001 | struct lttng_ht *ht) | |
fb3a43a9 | 2002 | { |
e316aad5 | 2003 | struct lttng_consumer_channel *free_chan = NULL; |
fb3a43a9 DG |
2004 | |
2005 | assert(stream); | |
2006 | /* | |
2007 | * This call should NEVER receive regular stream. It must always be | |
2008 | * metadata stream and this is crucial for data structure synchronization. | |
2009 | */ | |
2010 | assert(stream->metadata_flag); | |
2011 | ||
e316aad5 DG |
2012 | DBG3("Consumer delete metadata stream %d", stream->wait_fd); |
2013 | ||
74251bb8 | 2014 | pthread_mutex_lock(&consumer_data.lock); |
a9838785 | 2015 | pthread_mutex_lock(&stream->chan->lock); |
8994307f DG |
2016 | pthread_mutex_lock(&stream->lock); |
2017 | ||
6d574024 DG |
2018 | /* Remove any reference to that stream. */ |
2019 | consumer_stream_delete(stream, ht); | |
ca22feea | 2020 | |
6d574024 DG |
2021 | /* Close down everything including the relayd if one. */ |
2022 | consumer_stream_close(stream); | |
2023 | /* Destroy tracer buffers of the stream. */ | |
2024 | consumer_stream_destroy_buffers(stream); | |
fb3a43a9 DG |
2025 | |
2026 | /* Atomically decrement channel refcount since other threads can use it. */ | |
f2ad556d | 2027 | if (!uatomic_sub_return(&stream->chan->refcount, 1) |
ffe60014 | 2028 | && !uatomic_read(&stream->chan->nb_init_stream_left)) { |
c30aaa51 | 2029 | /* Go for channel deletion! */ |
e316aad5 | 2030 | free_chan = stream->chan; |
fb3a43a9 DG |
2031 | } |
2032 | ||
73811ecc DG |
2033 | /* |
2034 | * Nullify the stream reference so it is not used after deletion. The | |
6d574024 DG |
2035 | * channel lock MUST be acquired before being able to check for a NULL |
2036 | * pointer value. | |
73811ecc DG |
2037 | */ |
2038 | stream->chan->metadata_stream = NULL; | |
2039 | ||
8994307f | 2040 | pthread_mutex_unlock(&stream->lock); |
a9838785 | 2041 | pthread_mutex_unlock(&stream->chan->lock); |
74251bb8 | 2042 | pthread_mutex_unlock(&consumer_data.lock); |
e316aad5 DG |
2043 | |
2044 | if (free_chan) { | |
2045 | consumer_del_channel(free_chan); | |
2046 | } | |
2047 | ||
6d574024 | 2048 | consumer_stream_free(stream); |
fb3a43a9 DG |
2049 | } |
2050 | ||
2051 | /* | |
2052 | * Action done with the metadata stream when adding it to the consumer internal | |
2053 | * data structures to handle it. | |
2054 | */ | |
5ab66908 | 2055 | int consumer_add_metadata_stream(struct lttng_consumer_stream *stream) |
fb3a43a9 | 2056 | { |
5ab66908 | 2057 | struct lttng_ht *ht = metadata_ht; |
e316aad5 | 2058 | int ret = 0; |
76082088 | 2059 | struct lttng_ht_iter iter; |
d88aee68 | 2060 | struct lttng_ht_node_u64 *node; |
fb3a43a9 | 2061 | |
e316aad5 DG |
2062 | assert(stream); |
2063 | assert(ht); | |
2064 | ||
d88aee68 | 2065 | DBG3("Adding metadata stream %" PRIu64 " to hash table", stream->key); |
e316aad5 DG |
2066 | |
2067 | pthread_mutex_lock(&consumer_data.lock); | |
a9838785 | 2068 | pthread_mutex_lock(&stream->chan->lock); |
ec6ea7d0 | 2069 | pthread_mutex_lock(&stream->chan->timer_lock); |
2e818a6a | 2070 | pthread_mutex_lock(&stream->lock); |
e316aad5 | 2071 | |
e316aad5 DG |
2072 | /* |
2073 | * From here, refcounts are updated so be _careful_ when returning an error | |
2074 | * after this point. | |
2075 | */ | |
2076 | ||
fb3a43a9 | 2077 | rcu_read_lock(); |
76082088 DG |
2078 | |
2079 | /* | |
2080 | * Lookup the stream just to make sure it does not exist in our internal | |
2081 | * state. This should NEVER happen. | |
2082 | */ | |
d88aee68 DG |
2083 | lttng_ht_lookup(ht, &stream->key, &iter); |
2084 | node = lttng_ht_iter_get_node_u64(&iter); | |
76082088 DG |
2085 | assert(!node); |
2086 | ||
e316aad5 | 2087 | /* |
ffe60014 DG |
2088 | * When nb_init_stream_left reaches 0, we don't need to trigger any action |
2089 | * in terms of destroying the associated channel, because the action that | |
e316aad5 DG |
2090 | * causes the count to become 0 also causes a stream to be added. The |
2091 | * channel deletion will thus be triggered by the following removal of this | |
2092 | * stream. | |
2093 | */ | |
ffe60014 | 2094 | if (uatomic_read(&stream->chan->nb_init_stream_left) > 0) { |
f2ad556d MD |
2095 | /* Increment refcount before decrementing nb_init_stream_left */ |
2096 | cmm_smp_wmb(); | |
ffe60014 | 2097 | uatomic_dec(&stream->chan->nb_init_stream_left); |
e316aad5 DG |
2098 | } |
2099 | ||
d88aee68 | 2100 | lttng_ht_add_unique_u64(ht, &stream->node); |
ca22feea | 2101 | |
d8ef542d MD |
2102 | lttng_ht_add_unique_u64(consumer_data.stream_per_chan_id_ht, |
2103 | &stream->node_channel_id); | |
2104 | ||
ca22feea DG |
2105 | /* |
2106 | * Add stream to the stream_list_ht of the consumer data. No need to steal | |
2107 | * the key since the HT does not use it and we allow to add redundant keys | |
2108 | * into this table. | |
2109 | */ | |
d88aee68 | 2110 | lttng_ht_add_u64(consumer_data.stream_list_ht, &stream->node_session_id); |
ca22feea | 2111 | |
fb3a43a9 | 2112 | rcu_read_unlock(); |
e316aad5 | 2113 | |
2e818a6a | 2114 | pthread_mutex_unlock(&stream->lock); |
a9838785 | 2115 | pthread_mutex_unlock(&stream->chan->lock); |
ec6ea7d0 | 2116 | pthread_mutex_unlock(&stream->chan->timer_lock); |
e316aad5 DG |
2117 | pthread_mutex_unlock(&consumer_data.lock); |
2118 | return ret; | |
fb3a43a9 DG |
2119 | } |
2120 | ||
8994307f DG |
2121 | /* |
2122 | * Delete data stream that are flagged for deletion (endpoint_status). | |
2123 | */ | |
2124 | static void validate_endpoint_status_data_stream(void) | |
2125 | { | |
2126 | struct lttng_ht_iter iter; | |
2127 | struct lttng_consumer_stream *stream; | |
2128 | ||
2129 | DBG("Consumer delete flagged data stream"); | |
2130 | ||
2131 | rcu_read_lock(); | |
2132 | cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) { | |
2133 | /* Validate delete flag of the stream */ | |
79d4ffb7 | 2134 | if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) { |
8994307f DG |
2135 | continue; |
2136 | } | |
2137 | /* Delete it right now */ | |
2138 | consumer_del_stream(stream, data_ht); | |
2139 | } | |
2140 | rcu_read_unlock(); | |
2141 | } | |
2142 | ||
2143 | /* | |
2144 | * Delete metadata stream that are flagged for deletion (endpoint_status). | |
2145 | */ | |
2146 | static void validate_endpoint_status_metadata_stream( | |
2147 | struct lttng_poll_event *pollset) | |
2148 | { | |
2149 | struct lttng_ht_iter iter; | |
2150 | struct lttng_consumer_stream *stream; | |
2151 | ||
2152 | DBG("Consumer delete flagged metadata stream"); | |
2153 | ||
2154 | assert(pollset); | |
2155 | ||
2156 | rcu_read_lock(); | |
2157 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) { | |
2158 | /* Validate delete flag of the stream */ | |
79d4ffb7 | 2159 | if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) { |
8994307f DG |
2160 | continue; |
2161 | } | |
2162 | /* | |
2163 | * Remove from pollset so the metadata thread can continue without | |
2164 | * blocking on a deleted stream. | |
2165 | */ | |
2166 | lttng_poll_del(pollset, stream->wait_fd); | |
2167 | ||
2168 | /* Delete it right now */ | |
2169 | consumer_del_metadata_stream(stream, metadata_ht); | |
2170 | } | |
2171 | rcu_read_unlock(); | |
2172 | } | |
2173 | ||
fb3a43a9 DG |
2174 | /* |
2175 | * Thread polls on metadata file descriptor and write them on disk or on the | |
2176 | * network. | |
2177 | */ | |
7d980def | 2178 | void *consumer_thread_metadata_poll(void *data) |
fb3a43a9 | 2179 | { |
1fc79fb4 | 2180 | int ret, i, pollfd, err = -1; |
fb3a43a9 | 2181 | uint32_t revents, nb_fd; |
e316aad5 | 2182 | struct lttng_consumer_stream *stream = NULL; |
fb3a43a9 | 2183 | struct lttng_ht_iter iter; |
d88aee68 | 2184 | struct lttng_ht_node_u64 *node; |
fb3a43a9 DG |
2185 | struct lttng_poll_event events; |
2186 | struct lttng_consumer_local_data *ctx = data; | |
2187 | ssize_t len; | |
2188 | ||
2189 | rcu_register_thread(); | |
2190 | ||
1fc79fb4 MD |
2191 | health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_METADATA); |
2192 | ||
2d57de81 MD |
2193 | if (testpoint(consumerd_thread_metadata)) { |
2194 | goto error_testpoint; | |
2195 | } | |
2196 | ||
9ce5646a MD |
2197 | health_code_update(); |
2198 | ||
fb3a43a9 DG |
2199 | DBG("Thread metadata poll started"); |
2200 | ||
fb3a43a9 DG |
2201 | /* Size is set to 1 for the consumer_metadata pipe */ |
2202 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
2203 | if (ret < 0) { | |
2204 | ERR("Poll set creation failed"); | |
d8ef542d | 2205 | goto end_poll; |
fb3a43a9 DG |
2206 | } |
2207 | ||
13886d2d DG |
2208 | ret = lttng_poll_add(&events, |
2209 | lttng_pipe_get_readfd(ctx->consumer_metadata_pipe), LPOLLIN); | |
fb3a43a9 DG |
2210 | if (ret < 0) { |
2211 | goto end; | |
2212 | } | |
2213 | ||
2214 | /* Main loop */ | |
2215 | DBG("Metadata main loop started"); | |
2216 | ||
2217 | while (1) { | |
fb3a43a9 | 2218 | restart: |
7fa2082e | 2219 | health_code_update(); |
9ce5646a | 2220 | health_poll_entry(); |
7fa2082e | 2221 | DBG("Metadata poll wait"); |
fb3a43a9 | 2222 | ret = lttng_poll_wait(&events, -1); |
7fa2082e MD |
2223 | DBG("Metadata poll return from wait with %d fd(s)", |
2224 | LTTNG_POLL_GETNB(&events)); | |
9ce5646a | 2225 | health_poll_exit(); |
fb3a43a9 DG |
2226 | DBG("Metadata event catched in thread"); |
2227 | if (ret < 0) { | |
2228 | if (errno == EINTR) { | |
e316aad5 | 2229 | ERR("Poll EINTR catched"); |
fb3a43a9 DG |
2230 | goto restart; |
2231 | } | |
d9607cd7 MD |
2232 | if (LTTNG_POLL_GETNB(&events) == 0) { |
2233 | err = 0; /* All is OK */ | |
2234 | } | |
2235 | goto end; | |
fb3a43a9 DG |
2236 | } |
2237 | ||
0d9c5d77 DG |
2238 | nb_fd = ret; |
2239 | ||
e316aad5 | 2240 | /* From here, the event is a metadata wait fd */ |
fb3a43a9 | 2241 | for (i = 0; i < nb_fd; i++) { |
9ce5646a MD |
2242 | health_code_update(); |
2243 | ||
fb3a43a9 DG |
2244 | revents = LTTNG_POLL_GETEV(&events, i); |
2245 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2246 | ||
fd20dac9 MD |
2247 | if (!revents) { |
2248 | /* No activity for this FD (poll implementation). */ | |
2249 | continue; | |
2250 | } | |
2251 | ||
13886d2d | 2252 | if (pollfd == lttng_pipe_get_readfd(ctx->consumer_metadata_pipe)) { |
03e43155 | 2253 | if (revents & LPOLLIN) { |
13886d2d DG |
2254 | ssize_t pipe_len; |
2255 | ||
2256 | pipe_len = lttng_pipe_read(ctx->consumer_metadata_pipe, | |
2257 | &stream, sizeof(stream)); | |
6cd525e8 | 2258 | if (pipe_len < sizeof(stream)) { |
03e43155 MD |
2259 | if (pipe_len < 0) { |
2260 | PERROR("read metadata stream"); | |
2261 | } | |
fb3a43a9 | 2262 | /* |
03e43155 MD |
2263 | * Remove the pipe from the poll set and continue the loop |
2264 | * since their might be data to consume. | |
fb3a43a9 | 2265 | */ |
03e43155 MD |
2266 | lttng_poll_del(&events, |
2267 | lttng_pipe_get_readfd(ctx->consumer_metadata_pipe)); | |
2268 | lttng_pipe_read_close(ctx->consumer_metadata_pipe); | |
fb3a43a9 DG |
2269 | continue; |
2270 | } | |
2271 | ||
8994307f DG |
2272 | /* A NULL stream means that the state has changed. */ |
2273 | if (stream == NULL) { | |
2274 | /* Check for deleted streams. */ | |
2275 | validate_endpoint_status_metadata_stream(&events); | |
3714380f | 2276 | goto restart; |
8994307f DG |
2277 | } |
2278 | ||
fb3a43a9 DG |
2279 | DBG("Adding metadata stream %d to poll set", |
2280 | stream->wait_fd); | |
2281 | ||
fb3a43a9 DG |
2282 | /* Add metadata stream to the global poll events list */ |
2283 | lttng_poll_add(&events, stream->wait_fd, | |
6d574024 | 2284 | LPOLLIN | LPOLLPRI | LPOLLHUP); |
03e43155 MD |
2285 | } else if (revents & (LPOLLERR | LPOLLHUP)) { |
2286 | DBG("Metadata thread pipe hung up"); | |
2287 | /* | |
2288 | * Remove the pipe from the poll set and continue the loop | |
2289 | * since their might be data to consume. | |
2290 | */ | |
2291 | lttng_poll_del(&events, | |
2292 | lttng_pipe_get_readfd(ctx->consumer_metadata_pipe)); | |
2293 | lttng_pipe_read_close(ctx->consumer_metadata_pipe); | |
2294 | continue; | |
2295 | } else { | |
2296 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2297 | goto end; | |
fb3a43a9 DG |
2298 | } |
2299 | ||
e316aad5 | 2300 | /* Handle other stream */ |
fb3a43a9 DG |
2301 | continue; |
2302 | } | |
2303 | ||
d09e1200 | 2304 | rcu_read_lock(); |
d88aee68 DG |
2305 | { |
2306 | uint64_t tmp_id = (uint64_t) pollfd; | |
2307 | ||
2308 | lttng_ht_lookup(metadata_ht, &tmp_id, &iter); | |
2309 | } | |
2310 | node = lttng_ht_iter_get_node_u64(&iter); | |
e316aad5 | 2311 | assert(node); |
fb3a43a9 DG |
2312 | |
2313 | stream = caa_container_of(node, struct lttng_consumer_stream, | |
58b1f425 | 2314 | node); |
fb3a43a9 | 2315 | |
03e43155 MD |
2316 | if (revents & (LPOLLIN | LPOLLPRI)) { |
2317 | /* Get the data out of the metadata file descriptor */ | |
2318 | DBG("Metadata available on fd %d", pollfd); | |
2319 | assert(stream->wait_fd == pollfd); | |
2320 | ||
2321 | do { | |
2322 | health_code_update(); | |
2323 | ||
2324 | len = ctx->on_buffer_ready(stream, ctx); | |
2325 | /* | |
2326 | * We don't check the return value here since if we get | |
2327 | * a negative len, it means an error occured thus we | |
2328 | * simply remove it from the poll set and free the | |
2329 | * stream. | |
2330 | */ | |
2331 | } while (len > 0); | |
2332 | ||
2333 | /* It's ok to have an unavailable sub-buffer */ | |
2334 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { | |
2335 | /* Clean up stream from consumer and free it. */ | |
2336 | lttng_poll_del(&events, stream->wait_fd); | |
2337 | consumer_del_metadata_stream(stream, metadata_ht); | |
2338 | } | |
2339 | } else if (revents & (LPOLLERR | LPOLLHUP)) { | |
e316aad5 | 2340 | DBG("Metadata fd %d is hup|err.", pollfd); |
fb3a43a9 DG |
2341 | if (!stream->hangup_flush_done |
2342 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
2343 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
2344 | DBG("Attempting to flush and consume the UST buffers"); | |
2345 | lttng_ustconsumer_on_stream_hangup(stream); | |
2346 | ||
2347 | /* We just flushed the stream now read it. */ | |
4bb94b75 | 2348 | do { |
9ce5646a MD |
2349 | health_code_update(); |
2350 | ||
4bb94b75 DG |
2351 | len = ctx->on_buffer_ready(stream, ctx); |
2352 | /* | |
2353 | * We don't check the return value here since if we get | |
2354 | * a negative len, it means an error occured thus we | |
2355 | * simply remove it from the poll set and free the | |
2356 | * stream. | |
2357 | */ | |
2358 | } while (len > 0); | |
fb3a43a9 DG |
2359 | } |
2360 | ||
fb3a43a9 | 2361 | lttng_poll_del(&events, stream->wait_fd); |
e316aad5 DG |
2362 | /* |
2363 | * This call update the channel states, closes file descriptors | |
2364 | * and securely free the stream. | |
2365 | */ | |
2366 | consumer_del_metadata_stream(stream, metadata_ht); | |
03e43155 MD |
2367 | } else { |
2368 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
6f2f1a70 | 2369 | rcu_read_unlock(); |
03e43155 | 2370 | goto end; |
fb3a43a9 | 2371 | } |
e316aad5 | 2372 | /* Release RCU lock for the stream looked up */ |
d09e1200 | 2373 | rcu_read_unlock(); |
fb3a43a9 DG |
2374 | } |
2375 | } | |
2376 | ||
1fc79fb4 MD |
2377 | /* All is OK */ |
2378 | err = 0; | |
fb3a43a9 DG |
2379 | end: |
2380 | DBG("Metadata poll thread exiting"); | |
fb3a43a9 | 2381 | |
d8ef542d MD |
2382 | lttng_poll_clean(&events); |
2383 | end_poll: | |
2d57de81 | 2384 | error_testpoint: |
1fc79fb4 MD |
2385 | if (err) { |
2386 | health_error(); | |
2387 | ERR("Health error occurred in %s", __func__); | |
2388 | } | |
2389 | health_unregister(health_consumerd); | |
fb3a43a9 DG |
2390 | rcu_unregister_thread(); |
2391 | return NULL; | |
2392 | } | |
2393 | ||
3bd1e081 | 2394 | /* |
e4421fec | 2395 | * This thread polls the fds in the set to consume the data and write |
3bd1e081 MD |
2396 | * it to tracefile if necessary. |
2397 | */ | |
7d980def | 2398 | void *consumer_thread_data_poll(void *data) |
3bd1e081 | 2399 | { |
1fc79fb4 | 2400 | int num_rdy, num_hup, high_prio, ret, i, err = -1; |
3bd1e081 MD |
2401 | struct pollfd *pollfd = NULL; |
2402 | /* local view of the streams */ | |
c869f647 | 2403 | struct lttng_consumer_stream **local_stream = NULL, *new_stream = NULL; |
3bd1e081 MD |
2404 | /* local view of consumer_data.fds_count */ |
2405 | int nb_fd = 0; | |
3bd1e081 | 2406 | struct lttng_consumer_local_data *ctx = data; |
00e2e675 | 2407 | ssize_t len; |
3bd1e081 | 2408 | |
e7b994a3 DG |
2409 | rcu_register_thread(); |
2410 | ||
1fc79fb4 MD |
2411 | health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_DATA); |
2412 | ||
2d57de81 MD |
2413 | if (testpoint(consumerd_thread_data)) { |
2414 | goto error_testpoint; | |
2415 | } | |
2416 | ||
9ce5646a MD |
2417 | health_code_update(); |
2418 | ||
4df6c8cb MD |
2419 | local_stream = zmalloc(sizeof(struct lttng_consumer_stream *)); |
2420 | if (local_stream == NULL) { | |
2421 | PERROR("local_stream malloc"); | |
2422 | goto end; | |
2423 | } | |
3bd1e081 MD |
2424 | |
2425 | while (1) { | |
9ce5646a MD |
2426 | health_code_update(); |
2427 | ||
3bd1e081 MD |
2428 | high_prio = 0; |
2429 | num_hup = 0; | |
2430 | ||
2431 | /* | |
e4421fec | 2432 | * the fds set has been updated, we need to update our |
3bd1e081 MD |
2433 | * local array as well |
2434 | */ | |
2435 | pthread_mutex_lock(&consumer_data.lock); | |
2436 | if (consumer_data.need_update) { | |
0e428499 DG |
2437 | free(pollfd); |
2438 | pollfd = NULL; | |
2439 | ||
2440 | free(local_stream); | |
2441 | local_stream = NULL; | |
3bd1e081 | 2442 | |
02b3d176 DG |
2443 | /* |
2444 | * Allocate for all fds +1 for the consumer_data_pipe and +1 for | |
2445 | * wake up pipe. | |
2446 | */ | |
2447 | pollfd = zmalloc((consumer_data.stream_count + 2) * sizeof(struct pollfd)); | |
3bd1e081 | 2448 | if (pollfd == NULL) { |
7a57cf92 | 2449 | PERROR("pollfd malloc"); |
3bd1e081 MD |
2450 | pthread_mutex_unlock(&consumer_data.lock); |
2451 | goto end; | |
2452 | } | |
2453 | ||
02b3d176 | 2454 | local_stream = zmalloc((consumer_data.stream_count + 2) * |
747f8642 | 2455 | sizeof(struct lttng_consumer_stream *)); |
3bd1e081 | 2456 | if (local_stream == NULL) { |
7a57cf92 | 2457 | PERROR("local_stream malloc"); |
3bd1e081 MD |
2458 | pthread_mutex_unlock(&consumer_data.lock); |
2459 | goto end; | |
2460 | } | |
ffe60014 | 2461 | ret = update_poll_array(ctx, &pollfd, local_stream, |
43c34bc3 | 2462 | data_ht); |
3bd1e081 MD |
2463 | if (ret < 0) { |
2464 | ERR("Error in allocating pollfd or local_outfds"); | |
f73fabfd | 2465 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
2466 | pthread_mutex_unlock(&consumer_data.lock); |
2467 | goto end; | |
2468 | } | |
2469 | nb_fd = ret; | |
2470 | consumer_data.need_update = 0; | |
2471 | } | |
2472 | pthread_mutex_unlock(&consumer_data.lock); | |
2473 | ||
4078b776 MD |
2474 | /* No FDs and consumer_quit, consumer_cleanup the thread */ |
2475 | if (nb_fd == 0 && consumer_quit == 1) { | |
1fc79fb4 | 2476 | err = 0; /* All is OK */ |
4078b776 MD |
2477 | goto end; |
2478 | } | |
3bd1e081 | 2479 | /* poll on the array of fds */ |
88f2b785 | 2480 | restart: |
02b3d176 | 2481 | DBG("polling on %d fd", nb_fd + 2); |
9ce5646a | 2482 | health_poll_entry(); |
02b3d176 | 2483 | num_rdy = poll(pollfd, nb_fd + 2, -1); |
9ce5646a | 2484 | health_poll_exit(); |
3bd1e081 MD |
2485 | DBG("poll num_rdy : %d", num_rdy); |
2486 | if (num_rdy == -1) { | |
88f2b785 MD |
2487 | /* |
2488 | * Restart interrupted system call. | |
2489 | */ | |
2490 | if (errno == EINTR) { | |
2491 | goto restart; | |
2492 | } | |
7a57cf92 | 2493 | PERROR("Poll error"); |
f73fabfd | 2494 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
2495 | goto end; |
2496 | } else if (num_rdy == 0) { | |
2497 | DBG("Polling thread timed out"); | |
2498 | goto end; | |
2499 | } | |
2500 | ||
3bd1e081 | 2501 | /* |
50f8ae69 | 2502 | * If the consumer_data_pipe triggered poll go directly to the |
00e2e675 DG |
2503 | * beginning of the loop to update the array. We want to prioritize |
2504 | * array update over low-priority reads. | |
3bd1e081 | 2505 | */ |
509bb1cf | 2506 | if (pollfd[nb_fd].revents & (POLLIN | POLLPRI)) { |
ab30f567 | 2507 | ssize_t pipe_readlen; |
04fdd819 | 2508 | |
50f8ae69 | 2509 | DBG("consumer_data_pipe wake up"); |
acdb9057 DG |
2510 | pipe_readlen = lttng_pipe_read(ctx->consumer_data_pipe, |
2511 | &new_stream, sizeof(new_stream)); | |
6cd525e8 MD |
2512 | if (pipe_readlen < sizeof(new_stream)) { |
2513 | PERROR("Consumer data pipe"); | |
23f5f35d DG |
2514 | /* Continue so we can at least handle the current stream(s). */ |
2515 | continue; | |
2516 | } | |
c869f647 DG |
2517 | |
2518 | /* | |
2519 | * If the stream is NULL, just ignore it. It's also possible that | |
2520 | * the sessiond poll thread changed the consumer_quit state and is | |
2521 | * waking us up to test it. | |
2522 | */ | |
2523 | if (new_stream == NULL) { | |
8994307f | 2524 | validate_endpoint_status_data_stream(); |
c869f647 DG |
2525 | continue; |
2526 | } | |
2527 | ||
c869f647 | 2528 | /* Continue to update the local streams and handle prio ones */ |
3bd1e081 MD |
2529 | continue; |
2530 | } | |
2531 | ||
02b3d176 DG |
2532 | /* Handle wakeup pipe. */ |
2533 | if (pollfd[nb_fd + 1].revents & (POLLIN | POLLPRI)) { | |
2534 | char dummy; | |
2535 | ssize_t pipe_readlen; | |
2536 | ||
2537 | pipe_readlen = lttng_pipe_read(ctx->consumer_wakeup_pipe, &dummy, | |
2538 | sizeof(dummy)); | |
2539 | if (pipe_readlen < 0) { | |
2540 | PERROR("Consumer data wakeup pipe"); | |
2541 | } | |
2542 | /* We've been awakened to handle stream(s). */ | |
2543 | ctx->has_wakeup = 0; | |
2544 | } | |
2545 | ||
3bd1e081 MD |
2546 | /* Take care of high priority channels first. */ |
2547 | for (i = 0; i < nb_fd; i++) { | |
9ce5646a MD |
2548 | health_code_update(); |
2549 | ||
9617607b DG |
2550 | if (local_stream[i] == NULL) { |
2551 | continue; | |
2552 | } | |
fb3a43a9 | 2553 | if (pollfd[i].revents & POLLPRI) { |
d41f73b7 MD |
2554 | DBG("Urgent read on fd %d", pollfd[i].fd); |
2555 | high_prio = 1; | |
4078b776 | 2556 | len = ctx->on_buffer_ready(local_stream[i], ctx); |
d41f73b7 | 2557 | /* it's ok to have an unavailable sub-buffer */ |
b64403e3 | 2558 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2559 | /* Clean the stream and free it. */ |
2560 | consumer_del_stream(local_stream[i], data_ht); | |
9617607b | 2561 | local_stream[i] = NULL; |
4078b776 MD |
2562 | } else if (len > 0) { |
2563 | local_stream[i]->data_read = 1; | |
d41f73b7 | 2564 | } |
3bd1e081 MD |
2565 | } |
2566 | } | |
2567 | ||
4078b776 MD |
2568 | /* |
2569 | * If we read high prio channel in this loop, try again | |
2570 | * for more high prio data. | |
2571 | */ | |
2572 | if (high_prio) { | |
3bd1e081 MD |
2573 | continue; |
2574 | } | |
2575 | ||
2576 | /* Take care of low priority channels. */ | |
4078b776 | 2577 | for (i = 0; i < nb_fd; i++) { |
9ce5646a MD |
2578 | health_code_update(); |
2579 | ||
9617607b DG |
2580 | if (local_stream[i] == NULL) { |
2581 | continue; | |
2582 | } | |
4078b776 | 2583 | if ((pollfd[i].revents & POLLIN) || |
02b3d176 DG |
2584 | local_stream[i]->hangup_flush_done || |
2585 | local_stream[i]->has_data) { | |
4078b776 MD |
2586 | DBG("Normal read on fd %d", pollfd[i].fd); |
2587 | len = ctx->on_buffer_ready(local_stream[i], ctx); | |
2588 | /* it's ok to have an unavailable sub-buffer */ | |
b64403e3 | 2589 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2590 | /* Clean the stream and free it. */ |
2591 | consumer_del_stream(local_stream[i], data_ht); | |
9617607b | 2592 | local_stream[i] = NULL; |
4078b776 MD |
2593 | } else if (len > 0) { |
2594 | local_stream[i]->data_read = 1; | |
2595 | } | |
2596 | } | |
2597 | } | |
2598 | ||
2599 | /* Handle hangup and errors */ | |
2600 | for (i = 0; i < nb_fd; i++) { | |
9ce5646a MD |
2601 | health_code_update(); |
2602 | ||
9617607b DG |
2603 | if (local_stream[i] == NULL) { |
2604 | continue; | |
2605 | } | |
4078b776 MD |
2606 | if (!local_stream[i]->hangup_flush_done |
2607 | && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL)) | |
2608 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
2609 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
2610 | DBG("fd %d is hup|err|nval. Attempting flush and read.", | |
9617607b | 2611 | pollfd[i].fd); |
4078b776 MD |
2612 | lttng_ustconsumer_on_stream_hangup(local_stream[i]); |
2613 | /* Attempt read again, for the data we just flushed. */ | |
2614 | local_stream[i]->data_read = 1; | |
2615 | } | |
2616 | /* | |
2617 | * If the poll flag is HUP/ERR/NVAL and we have | |
2618 | * read no data in this pass, we can remove the | |
2619 | * stream from its hash table. | |
2620 | */ | |
2621 | if ((pollfd[i].revents & POLLHUP)) { | |
2622 | DBG("Polling fd %d tells it has hung up.", pollfd[i].fd); | |
2623 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2624 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2625 | local_stream[i] = NULL; |
4078b776 MD |
2626 | num_hup++; |
2627 | } | |
2628 | } else if (pollfd[i].revents & POLLERR) { | |
2629 | ERR("Error returned in polling fd %d.", pollfd[i].fd); | |
2630 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2631 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2632 | local_stream[i] = NULL; |
4078b776 MD |
2633 | num_hup++; |
2634 | } | |
2635 | } else if (pollfd[i].revents & POLLNVAL) { | |
2636 | ERR("Polling fd %d tells fd is not open.", pollfd[i].fd); | |
2637 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2638 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2639 | local_stream[i] = NULL; |
4078b776 | 2640 | num_hup++; |
3bd1e081 MD |
2641 | } |
2642 | } | |
9617607b DG |
2643 | if (local_stream[i] != NULL) { |
2644 | local_stream[i]->data_read = 0; | |
2645 | } | |
3bd1e081 MD |
2646 | } |
2647 | } | |
1fc79fb4 MD |
2648 | /* All is OK */ |
2649 | err = 0; | |
3bd1e081 MD |
2650 | end: |
2651 | DBG("polling thread exiting"); | |
0e428499 DG |
2652 | free(pollfd); |
2653 | free(local_stream); | |
fb3a43a9 DG |
2654 | |
2655 | /* | |
2656 | * Close the write side of the pipe so epoll_wait() in | |
7d980def DG |
2657 | * consumer_thread_metadata_poll can catch it. The thread is monitoring the |
2658 | * read side of the pipe. If we close them both, epoll_wait strangely does | |
2659 | * not return and could create a endless wait period if the pipe is the | |
2660 | * only tracked fd in the poll set. The thread will take care of closing | |
2661 | * the read side. | |
fb3a43a9 | 2662 | */ |
13886d2d | 2663 | (void) lttng_pipe_write_close(ctx->consumer_metadata_pipe); |
fb3a43a9 | 2664 | |
2d57de81 | 2665 | error_testpoint: |
1fc79fb4 MD |
2666 | if (err) { |
2667 | health_error(); | |
2668 | ERR("Health error occurred in %s", __func__); | |
2669 | } | |
2670 | health_unregister(health_consumerd); | |
2671 | ||
e7b994a3 | 2672 | rcu_unregister_thread(); |
3bd1e081 MD |
2673 | return NULL; |
2674 | } | |
2675 | ||
d8ef542d MD |
2676 | /* |
2677 | * Close wake-up end of each stream belonging to the channel. This will | |
2678 | * allow the poll() on the stream read-side to detect when the | |
2679 | * write-side (application) finally closes them. | |
2680 | */ | |
2681 | static | |
2682 | void consumer_close_channel_streams(struct lttng_consumer_channel *channel) | |
2683 | { | |
2684 | struct lttng_ht *ht; | |
2685 | struct lttng_consumer_stream *stream; | |
2686 | struct lttng_ht_iter iter; | |
2687 | ||
2688 | ht = consumer_data.stream_per_chan_id_ht; | |
2689 | ||
2690 | rcu_read_lock(); | |
2691 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
2692 | ht->hash_fct(&channel->key, lttng_ht_seed), | |
2693 | ht->match_fct, &channel->key, | |
2694 | &iter.iter, stream, node_channel_id.node) { | |
f2ad556d MD |
2695 | /* |
2696 | * Protect against teardown with mutex. | |
2697 | */ | |
2698 | pthread_mutex_lock(&stream->lock); | |
2699 | if (cds_lfht_is_node_deleted(&stream->node.node)) { | |
2700 | goto next; | |
2701 | } | |
d8ef542d MD |
2702 | switch (consumer_data.type) { |
2703 | case LTTNG_CONSUMER_KERNEL: | |
2704 | break; | |
2705 | case LTTNG_CONSUMER32_UST: | |
2706 | case LTTNG_CONSUMER64_UST: | |
b4a650f3 DG |
2707 | if (stream->metadata_flag) { |
2708 | /* Safe and protected by the stream lock. */ | |
2709 | lttng_ustconsumer_close_metadata(stream->chan); | |
2710 | } else { | |
2711 | /* | |
2712 | * Note: a mutex is taken internally within | |
2713 | * liblttng-ust-ctl to protect timer wakeup_fd | |
2714 | * use from concurrent close. | |
2715 | */ | |
2716 | lttng_ustconsumer_close_stream_wakeup(stream); | |
2717 | } | |
d8ef542d MD |
2718 | break; |
2719 | default: | |
2720 | ERR("Unknown consumer_data type"); | |
2721 | assert(0); | |
2722 | } | |
f2ad556d MD |
2723 | next: |
2724 | pthread_mutex_unlock(&stream->lock); | |
d8ef542d MD |
2725 | } |
2726 | rcu_read_unlock(); | |
2727 | } | |
2728 | ||
2729 | static void destroy_channel_ht(struct lttng_ht *ht) | |
2730 | { | |
2731 | struct lttng_ht_iter iter; | |
2732 | struct lttng_consumer_channel *channel; | |
2733 | int ret; | |
2734 | ||
2735 | if (ht == NULL) { | |
2736 | return; | |
2737 | } | |
2738 | ||
2739 | rcu_read_lock(); | |
2740 | cds_lfht_for_each_entry(ht->ht, &iter.iter, channel, wait_fd_node.node) { | |
2741 | ret = lttng_ht_del(ht, &iter); | |
2742 | assert(ret != 0); | |
2743 | } | |
2744 | rcu_read_unlock(); | |
2745 | ||
2746 | lttng_ht_destroy(ht); | |
2747 | } | |
2748 | ||
2749 | /* | |
2750 | * This thread polls the channel fds to detect when they are being | |
2751 | * closed. It closes all related streams if the channel is detected as | |
2752 | * closed. It is currently only used as a shim layer for UST because the | |
2753 | * consumerd needs to keep the per-stream wakeup end of pipes open for | |
2754 | * periodical flush. | |
2755 | */ | |
2756 | void *consumer_thread_channel_poll(void *data) | |
2757 | { | |
1fc79fb4 | 2758 | int ret, i, pollfd, err = -1; |
d8ef542d MD |
2759 | uint32_t revents, nb_fd; |
2760 | struct lttng_consumer_channel *chan = NULL; | |
2761 | struct lttng_ht_iter iter; | |
2762 | struct lttng_ht_node_u64 *node; | |
2763 | struct lttng_poll_event events; | |
2764 | struct lttng_consumer_local_data *ctx = data; | |
2765 | struct lttng_ht *channel_ht; | |
2766 | ||
2767 | rcu_register_thread(); | |
2768 | ||
1fc79fb4 MD |
2769 | health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_CHANNEL); |
2770 | ||
2d57de81 MD |
2771 | if (testpoint(consumerd_thread_channel)) { |
2772 | goto error_testpoint; | |
2773 | } | |
2774 | ||
9ce5646a MD |
2775 | health_code_update(); |
2776 | ||
d8ef542d MD |
2777 | channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
2778 | if (!channel_ht) { | |
2779 | /* ENOMEM at this point. Better to bail out. */ | |
2780 | goto end_ht; | |
2781 | } | |
2782 | ||
2783 | DBG("Thread channel poll started"); | |
2784 | ||
2785 | /* Size is set to 1 for the consumer_channel pipe */ | |
2786 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
2787 | if (ret < 0) { | |
2788 | ERR("Poll set creation failed"); | |
2789 | goto end_poll; | |
2790 | } | |
2791 | ||
2792 | ret = lttng_poll_add(&events, ctx->consumer_channel_pipe[0], LPOLLIN); | |
2793 | if (ret < 0) { | |
2794 | goto end; | |
2795 | } | |
2796 | ||
2797 | /* Main loop */ | |
2798 | DBG("Channel main loop started"); | |
2799 | ||
2800 | while (1) { | |
d8ef542d | 2801 | restart: |
7fa2082e MD |
2802 | health_code_update(); |
2803 | DBG("Channel poll wait"); | |
9ce5646a | 2804 | health_poll_entry(); |
d8ef542d | 2805 | ret = lttng_poll_wait(&events, -1); |
7fa2082e MD |
2806 | DBG("Channel poll return from wait with %d fd(s)", |
2807 | LTTNG_POLL_GETNB(&events)); | |
9ce5646a | 2808 | health_poll_exit(); |
d8ef542d MD |
2809 | DBG("Channel event catched in thread"); |
2810 | if (ret < 0) { | |
2811 | if (errno == EINTR) { | |
2812 | ERR("Poll EINTR catched"); | |
2813 | goto restart; | |
2814 | } | |
d9607cd7 MD |
2815 | if (LTTNG_POLL_GETNB(&events) == 0) { |
2816 | err = 0; /* All is OK */ | |
2817 | } | |
d8ef542d MD |
2818 | goto end; |
2819 | } | |
2820 | ||
2821 | nb_fd = ret; | |
2822 | ||
2823 | /* From here, the event is a channel wait fd */ | |
2824 | for (i = 0; i < nb_fd; i++) { | |
9ce5646a MD |
2825 | health_code_update(); |
2826 | ||
d8ef542d MD |
2827 | revents = LTTNG_POLL_GETEV(&events, i); |
2828 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2829 | ||
d8ef542d | 2830 | if (!revents) { |
fd20dac9 | 2831 | /* No activity for this FD (poll implementation). */ |
d8ef542d MD |
2832 | continue; |
2833 | } | |
fd20dac9 | 2834 | |
d8ef542d | 2835 | if (pollfd == ctx->consumer_channel_pipe[0]) { |
03e43155 | 2836 | if (revents & LPOLLIN) { |
d8ef542d | 2837 | enum consumer_channel_action action; |
a0cbdd2e | 2838 | uint64_t key; |
d8ef542d | 2839 | |
a0cbdd2e | 2840 | ret = read_channel_pipe(ctx, &chan, &key, &action); |
d8ef542d | 2841 | if (ret <= 0) { |
03e43155 MD |
2842 | if (ret < 0) { |
2843 | ERR("Error reading channel pipe"); | |
2844 | } | |
2845 | lttng_poll_del(&events, ctx->consumer_channel_pipe[0]); | |
d8ef542d MD |
2846 | continue; |
2847 | } | |
2848 | ||
2849 | switch (action) { | |
2850 | case CONSUMER_CHANNEL_ADD: | |
2851 | DBG("Adding channel %d to poll set", | |
2852 | chan->wait_fd); | |
2853 | ||
2854 | lttng_ht_node_init_u64(&chan->wait_fd_node, | |
2855 | chan->wait_fd); | |
c7260a81 | 2856 | rcu_read_lock(); |
d8ef542d MD |
2857 | lttng_ht_add_unique_u64(channel_ht, |
2858 | &chan->wait_fd_node); | |
c7260a81 | 2859 | rcu_read_unlock(); |
d8ef542d MD |
2860 | /* Add channel to the global poll events list */ |
2861 | lttng_poll_add(&events, chan->wait_fd, | |
03e43155 | 2862 | LPOLLERR | LPOLLHUP); |
d8ef542d | 2863 | break; |
a0cbdd2e MD |
2864 | case CONSUMER_CHANNEL_DEL: |
2865 | { | |
b4a650f3 DG |
2866 | /* |
2867 | * This command should never be called if the channel | |
2868 | * has streams monitored by either the data or metadata | |
2869 | * thread. The consumer only notify this thread with a | |
2870 | * channel del. command if it receives a destroy | |
2871 | * channel command from the session daemon that send it | |
2872 | * if a command prior to the GET_CHANNEL failed. | |
2873 | */ | |
2874 | ||
c7260a81 | 2875 | rcu_read_lock(); |
a0cbdd2e MD |
2876 | chan = consumer_find_channel(key); |
2877 | if (!chan) { | |
c7260a81 | 2878 | rcu_read_unlock(); |
a0cbdd2e MD |
2879 | ERR("UST consumer get channel key %" PRIu64 " not found for del channel", key); |
2880 | break; | |
2881 | } | |
2882 | lttng_poll_del(&events, chan->wait_fd); | |
f623cc0b | 2883 | iter.iter.node = &chan->wait_fd_node.node; |
a0cbdd2e MD |
2884 | ret = lttng_ht_del(channel_ht, &iter); |
2885 | assert(ret == 0); | |
a0cbdd2e | 2886 | |
f2a444f1 DG |
2887 | switch (consumer_data.type) { |
2888 | case LTTNG_CONSUMER_KERNEL: | |
2889 | break; | |
2890 | case LTTNG_CONSUMER32_UST: | |
2891 | case LTTNG_CONSUMER64_UST: | |
212d67a2 DG |
2892 | health_code_update(); |
2893 | /* Destroy streams that might have been left in the stream list. */ | |
2894 | clean_channel_stream_list(chan); | |
f2a444f1 DG |
2895 | break; |
2896 | default: | |
2897 | ERR("Unknown consumer_data type"); | |
2898 | assert(0); | |
2899 | } | |
2900 | ||
a0cbdd2e MD |
2901 | /* |
2902 | * Release our own refcount. Force channel deletion even if | |
2903 | * streams were not initialized. | |
2904 | */ | |
2905 | if (!uatomic_sub_return(&chan->refcount, 1)) { | |
2906 | consumer_del_channel(chan); | |
2907 | } | |
c7260a81 | 2908 | rcu_read_unlock(); |
a0cbdd2e MD |
2909 | goto restart; |
2910 | } | |
d8ef542d MD |
2911 | case CONSUMER_CHANNEL_QUIT: |
2912 | /* | |
2913 | * Remove the pipe from the poll set and continue the loop | |
2914 | * since their might be data to consume. | |
2915 | */ | |
2916 | lttng_poll_del(&events, ctx->consumer_channel_pipe[0]); | |
2917 | continue; | |
2918 | default: | |
2919 | ERR("Unknown action"); | |
2920 | break; | |
2921 | } | |
03e43155 MD |
2922 | } else if (revents & (LPOLLERR | LPOLLHUP)) { |
2923 | DBG("Channel thread pipe hung up"); | |
2924 | /* | |
2925 | * Remove the pipe from the poll set and continue the loop | |
2926 | * since their might be data to consume. | |
2927 | */ | |
2928 | lttng_poll_del(&events, ctx->consumer_channel_pipe[0]); | |
2929 | continue; | |
2930 | } else { | |
2931 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2932 | goto end; | |
d8ef542d MD |
2933 | } |
2934 | ||
2935 | /* Handle other stream */ | |
2936 | continue; | |
2937 | } | |
2938 | ||
2939 | rcu_read_lock(); | |
2940 | { | |
2941 | uint64_t tmp_id = (uint64_t) pollfd; | |
2942 | ||
2943 | lttng_ht_lookup(channel_ht, &tmp_id, &iter); | |
2944 | } | |
2945 | node = lttng_ht_iter_get_node_u64(&iter); | |
2946 | assert(node); | |
2947 | ||
2948 | chan = caa_container_of(node, struct lttng_consumer_channel, | |
2949 | wait_fd_node); | |
2950 | ||
2951 | /* Check for error event */ | |
2952 | if (revents & (LPOLLERR | LPOLLHUP)) { | |
2953 | DBG("Channel fd %d is hup|err.", pollfd); | |
2954 | ||
2955 | lttng_poll_del(&events, chan->wait_fd); | |
2956 | ret = lttng_ht_del(channel_ht, &iter); | |
2957 | assert(ret == 0); | |
b4a650f3 DG |
2958 | |
2959 | /* | |
2960 | * This will close the wait fd for each stream associated to | |
2961 | * this channel AND monitored by the data/metadata thread thus | |
2962 | * will be clean by the right thread. | |
2963 | */ | |
d8ef542d | 2964 | consumer_close_channel_streams(chan); |
f2ad556d MD |
2965 | |
2966 | /* Release our own refcount */ | |
2967 | if (!uatomic_sub_return(&chan->refcount, 1) | |
2968 | && !uatomic_read(&chan->nb_init_stream_left)) { | |
2969 | consumer_del_channel(chan); | |
2970 | } | |
03e43155 MD |
2971 | } else { |
2972 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2973 | rcu_read_unlock(); | |
2974 | goto end; | |
d8ef542d MD |
2975 | } |
2976 | ||
2977 | /* Release RCU lock for the channel looked up */ | |
2978 | rcu_read_unlock(); | |
2979 | } | |
2980 | } | |
2981 | ||
1fc79fb4 MD |
2982 | /* All is OK */ |
2983 | err = 0; | |
d8ef542d MD |
2984 | end: |
2985 | lttng_poll_clean(&events); | |
2986 | end_poll: | |
2987 | destroy_channel_ht(channel_ht); | |
2988 | end_ht: | |
2d57de81 | 2989 | error_testpoint: |
d8ef542d | 2990 | DBG("Channel poll thread exiting"); |
1fc79fb4 MD |
2991 | if (err) { |
2992 | health_error(); | |
2993 | ERR("Health error occurred in %s", __func__); | |
2994 | } | |
2995 | health_unregister(health_consumerd); | |
d8ef542d MD |
2996 | rcu_unregister_thread(); |
2997 | return NULL; | |
2998 | } | |
2999 | ||
331744e3 JD |
3000 | static int set_metadata_socket(struct lttng_consumer_local_data *ctx, |
3001 | struct pollfd *sockpoll, int client_socket) | |
3002 | { | |
3003 | int ret; | |
3004 | ||
3005 | assert(ctx); | |
3006 | assert(sockpoll); | |
3007 | ||
84382d49 MD |
3008 | ret = lttng_consumer_poll_socket(sockpoll); |
3009 | if (ret) { | |
331744e3 JD |
3010 | goto error; |
3011 | } | |
3012 | DBG("Metadata connection on client_socket"); | |
3013 | ||
3014 | /* Blocking call, waiting for transmission */ | |
3015 | ctx->consumer_metadata_socket = lttcomm_accept_unix_sock(client_socket); | |
3016 | if (ctx->consumer_metadata_socket < 0) { | |
3017 | WARN("On accept metadata"); | |
3018 | ret = -1; | |
3019 | goto error; | |
3020 | } | |
3021 | ret = 0; | |
3022 | ||
3023 | error: | |
3024 | return ret; | |
3025 | } | |
3026 | ||
3bd1e081 MD |
3027 | /* |
3028 | * This thread listens on the consumerd socket and receives the file | |
3029 | * descriptors from the session daemon. | |
3030 | */ | |
7d980def | 3031 | void *consumer_thread_sessiond_poll(void *data) |
3bd1e081 | 3032 | { |
1fc79fb4 | 3033 | int sock = -1, client_socket, ret, err = -1; |
3bd1e081 MD |
3034 | /* |
3035 | * structure to poll for incoming data on communication socket avoids | |
3036 | * making blocking sockets. | |
3037 | */ | |
3038 | struct pollfd consumer_sockpoll[2]; | |
3039 | struct lttng_consumer_local_data *ctx = data; | |
3040 | ||
e7b994a3 DG |
3041 | rcu_register_thread(); |
3042 | ||
1fc79fb4 MD |
3043 | health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_SESSIOND); |
3044 | ||
2d57de81 MD |
3045 | if (testpoint(consumerd_thread_sessiond)) { |
3046 | goto error_testpoint; | |
3047 | } | |
3048 | ||
9ce5646a MD |
3049 | health_code_update(); |
3050 | ||
3bd1e081 MD |
3051 | DBG("Creating command socket %s", ctx->consumer_command_sock_path); |
3052 | unlink(ctx->consumer_command_sock_path); | |
3053 | client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path); | |
3054 | if (client_socket < 0) { | |
3055 | ERR("Cannot create command socket"); | |
3056 | goto end; | |
3057 | } | |
3058 | ||
3059 | ret = lttcomm_listen_unix_sock(client_socket); | |
3060 | if (ret < 0) { | |
3061 | goto end; | |
3062 | } | |
3063 | ||
32258573 | 3064 | DBG("Sending ready command to lttng-sessiond"); |
f73fabfd | 3065 | ret = lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_COMMAND_SOCK_READY); |
3bd1e081 MD |
3066 | /* return < 0 on error, but == 0 is not fatal */ |
3067 | if (ret < 0) { | |
32258573 | 3068 | ERR("Error sending ready command to lttng-sessiond"); |
3bd1e081 MD |
3069 | goto end; |
3070 | } | |
3071 | ||
3bd1e081 MD |
3072 | /* prepare the FDs to poll : to client socket and the should_quit pipe */ |
3073 | consumer_sockpoll[0].fd = ctx->consumer_should_quit[0]; | |
3074 | consumer_sockpoll[0].events = POLLIN | POLLPRI; | |
3075 | consumer_sockpoll[1].fd = client_socket; | |
3076 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
3077 | ||
84382d49 MD |
3078 | ret = lttng_consumer_poll_socket(consumer_sockpoll); |
3079 | if (ret) { | |
3080 | if (ret > 0) { | |
3081 | /* should exit */ | |
3082 | err = 0; | |
3083 | } | |
3bd1e081 MD |
3084 | goto end; |
3085 | } | |
3086 | DBG("Connection on client_socket"); | |
3087 | ||
3088 | /* Blocking call, waiting for transmission */ | |
3089 | sock = lttcomm_accept_unix_sock(client_socket); | |
534d2592 | 3090 | if (sock < 0) { |
3bd1e081 MD |
3091 | WARN("On accept"); |
3092 | goto end; | |
3093 | } | |
3bd1e081 | 3094 | |
331744e3 JD |
3095 | /* |
3096 | * Setup metadata socket which is the second socket connection on the | |
3097 | * command unix socket. | |
3098 | */ | |
3099 | ret = set_metadata_socket(ctx, consumer_sockpoll, client_socket); | |
84382d49 MD |
3100 | if (ret) { |
3101 | if (ret > 0) { | |
3102 | /* should exit */ | |
3103 | err = 0; | |
3104 | } | |
331744e3 JD |
3105 | goto end; |
3106 | } | |
3107 | ||
d96f09c6 DG |
3108 | /* This socket is not useful anymore. */ |
3109 | ret = close(client_socket); | |
3110 | if (ret < 0) { | |
3111 | PERROR("close client_socket"); | |
3112 | } | |
3113 | client_socket = -1; | |
3114 | ||
3bd1e081 MD |
3115 | /* update the polling structure to poll on the established socket */ |
3116 | consumer_sockpoll[1].fd = sock; | |
3117 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
3118 | ||
3119 | while (1) { | |
9ce5646a MD |
3120 | health_code_update(); |
3121 | ||
3122 | health_poll_entry(); | |
3123 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
3124 | health_poll_exit(); | |
84382d49 MD |
3125 | if (ret) { |
3126 | if (ret > 0) { | |
3127 | /* should exit */ | |
3128 | err = 0; | |
3129 | } | |
3bd1e081 MD |
3130 | goto end; |
3131 | } | |
3132 | DBG("Incoming command on sock"); | |
3133 | ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
4cbc1a04 DG |
3134 | if (ret <= 0) { |
3135 | /* | |
3136 | * This could simply be a session daemon quitting. Don't output | |
3137 | * ERR() here. | |
3138 | */ | |
3139 | DBG("Communication interrupted on command socket"); | |
41ba6035 | 3140 | err = 0; |
3bd1e081 MD |
3141 | goto end; |
3142 | } | |
3143 | if (consumer_quit) { | |
3144 | DBG("consumer_thread_receive_fds received quit from signal"); | |
1fc79fb4 | 3145 | err = 0; /* All is OK */ |
3bd1e081 MD |
3146 | goto end; |
3147 | } | |
ffe60014 | 3148 | DBG("received command on sock"); |
3bd1e081 | 3149 | } |
1fc79fb4 MD |
3150 | /* All is OK */ |
3151 | err = 0; | |
3152 | ||
3bd1e081 | 3153 | end: |
ffe60014 | 3154 | DBG("Consumer thread sessiond poll exiting"); |
3bd1e081 | 3155 | |
d88aee68 DG |
3156 | /* |
3157 | * Close metadata streams since the producer is the session daemon which | |
3158 | * just died. | |
3159 | * | |
3160 | * NOTE: for now, this only applies to the UST tracer. | |
3161 | */ | |
6d574024 | 3162 | lttng_consumer_close_all_metadata(); |
d88aee68 | 3163 | |
3bd1e081 MD |
3164 | /* |
3165 | * when all fds have hung up, the polling thread | |
3166 | * can exit cleanly | |
3167 | */ | |
3168 | consumer_quit = 1; | |
3169 | ||
04fdd819 | 3170 | /* |
c869f647 | 3171 | * Notify the data poll thread to poll back again and test the |
8994307f | 3172 | * consumer_quit state that we just set so to quit gracefully. |
04fdd819 | 3173 | */ |
acdb9057 | 3174 | notify_thread_lttng_pipe(ctx->consumer_data_pipe); |
c869f647 | 3175 | |
a0cbdd2e | 3176 | notify_channel_pipe(ctx, NULL, -1, CONSUMER_CHANNEL_QUIT); |
d8ef542d | 3177 | |
5c635c72 MD |
3178 | notify_health_quit_pipe(health_quit_pipe); |
3179 | ||
d96f09c6 DG |
3180 | /* Cleaning up possibly open sockets. */ |
3181 | if (sock >= 0) { | |
3182 | ret = close(sock); | |
3183 | if (ret < 0) { | |
3184 | PERROR("close sock sessiond poll"); | |
3185 | } | |
3186 | } | |
3187 | if (client_socket >= 0) { | |
38476d24 | 3188 | ret = close(client_socket); |
d96f09c6 DG |
3189 | if (ret < 0) { |
3190 | PERROR("close client_socket sessiond poll"); | |
3191 | } | |
3192 | } | |
3193 | ||
2d57de81 | 3194 | error_testpoint: |
1fc79fb4 MD |
3195 | if (err) { |
3196 | health_error(); | |
3197 | ERR("Health error occurred in %s", __func__); | |
3198 | } | |
3199 | health_unregister(health_consumerd); | |
3200 | ||
e7b994a3 | 3201 | rcu_unregister_thread(); |
3bd1e081 MD |
3202 | return NULL; |
3203 | } | |
d41f73b7 | 3204 | |
4078b776 | 3205 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
3206 | struct lttng_consumer_local_data *ctx) |
3207 | { | |
74251bb8 DG |
3208 | ssize_t ret; |
3209 | ||
3210 | pthread_mutex_lock(&stream->lock); | |
94d49140 JD |
3211 | if (stream->metadata_flag) { |
3212 | pthread_mutex_lock(&stream->metadata_rdv_lock); | |
3213 | } | |
74251bb8 | 3214 | |
d41f73b7 MD |
3215 | switch (consumer_data.type) { |
3216 | case LTTNG_CONSUMER_KERNEL: | |
74251bb8 DG |
3217 | ret = lttng_kconsumer_read_subbuffer(stream, ctx); |
3218 | break; | |
7753dea8 MD |
3219 | case LTTNG_CONSUMER32_UST: |
3220 | case LTTNG_CONSUMER64_UST: | |
74251bb8 DG |
3221 | ret = lttng_ustconsumer_read_subbuffer(stream, ctx); |
3222 | break; | |
d41f73b7 MD |
3223 | default: |
3224 | ERR("Unknown consumer_data type"); | |
3225 | assert(0); | |
74251bb8 DG |
3226 | ret = -ENOSYS; |
3227 | break; | |
d41f73b7 | 3228 | } |
74251bb8 | 3229 | |
94d49140 JD |
3230 | if (stream->metadata_flag) { |
3231 | pthread_cond_broadcast(&stream->metadata_rdv); | |
3232 | pthread_mutex_unlock(&stream->metadata_rdv_lock); | |
3233 | } | |
74251bb8 DG |
3234 | pthread_mutex_unlock(&stream->lock); |
3235 | return ret; | |
d41f73b7 MD |
3236 | } |
3237 | ||
3238 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
3239 | { | |
3240 | switch (consumer_data.type) { | |
3241 | case LTTNG_CONSUMER_KERNEL: | |
3242 | return lttng_kconsumer_on_recv_stream(stream); | |
7753dea8 MD |
3243 | case LTTNG_CONSUMER32_UST: |
3244 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
3245 | return lttng_ustconsumer_on_recv_stream(stream); |
3246 | default: | |
3247 | ERR("Unknown consumer_data type"); | |
3248 | assert(0); | |
3249 | return -ENOSYS; | |
3250 | } | |
3251 | } | |
e4421fec DG |
3252 | |
3253 | /* | |
3254 | * Allocate and set consumer data hash tables. | |
3255 | */ | |
282dadbc | 3256 | int lttng_consumer_init(void) |
e4421fec | 3257 | { |
d88aee68 | 3258 | consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
282dadbc MD |
3259 | if (!consumer_data.channel_ht) { |
3260 | goto error; | |
3261 | } | |
3262 | ||
d88aee68 | 3263 | consumer_data.relayd_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
282dadbc MD |
3264 | if (!consumer_data.relayd_ht) { |
3265 | goto error; | |
3266 | } | |
3267 | ||
d88aee68 | 3268 | consumer_data.stream_list_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
282dadbc MD |
3269 | if (!consumer_data.stream_list_ht) { |
3270 | goto error; | |
3271 | } | |
3272 | ||
d8ef542d | 3273 | consumer_data.stream_per_chan_id_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
282dadbc MD |
3274 | if (!consumer_data.stream_per_chan_id_ht) { |
3275 | goto error; | |
3276 | } | |
3277 | ||
3278 | data_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); | |
3279 | if (!data_ht) { | |
3280 | goto error; | |
3281 | } | |
3282 | ||
3283 | metadata_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); | |
3284 | if (!metadata_ht) { | |
3285 | goto error; | |
3286 | } | |
3287 | ||
3288 | return 0; | |
3289 | ||
3290 | error: | |
3291 | return -1; | |
e4421fec | 3292 | } |
7735ef9e DG |
3293 | |
3294 | /* | |
3295 | * Process the ADD_RELAYD command receive by a consumer. | |
3296 | * | |
3297 | * This will create a relayd socket pair and add it to the relayd hash table. | |
3298 | * The caller MUST acquire a RCU read side lock before calling it. | |
3299 | */ | |
da009f2c | 3300 | int consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type, |
7735ef9e | 3301 | struct lttng_consumer_local_data *ctx, int sock, |
6151a90f | 3302 | struct pollfd *consumer_sockpoll, |
d3e2ba59 JD |
3303 | struct lttcomm_relayd_sock *relayd_sock, uint64_t sessiond_id, |
3304 | uint64_t relayd_session_id) | |
7735ef9e | 3305 | { |
cd2b09ed | 3306 | int fd = -1, ret = -1, relayd_created = 0; |
0c759fc9 | 3307 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
d4298c99 | 3308 | struct consumer_relayd_sock_pair *relayd = NULL; |
7735ef9e | 3309 | |
6151a90f JD |
3310 | assert(ctx); |
3311 | assert(relayd_sock); | |
3312 | ||
da009f2c | 3313 | DBG("Consumer adding relayd socket (idx: %" PRIu64 ")", net_seq_idx); |
7735ef9e DG |
3314 | |
3315 | /* Get relayd reference if exists. */ | |
3316 | relayd = consumer_find_relayd(net_seq_idx); | |
3317 | if (relayd == NULL) { | |
da009f2c | 3318 | assert(sock_type == LTTNG_STREAM_CONTROL); |
7735ef9e DG |
3319 | /* Not found. Allocate one. */ |
3320 | relayd = consumer_allocate_relayd_sock_pair(net_seq_idx); | |
3321 | if (relayd == NULL) { | |
0d08d75e | 3322 | ret = -ENOMEM; |
618a6a28 MD |
3323 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; |
3324 | goto error; | |
0d08d75e | 3325 | } else { |
30319bcb | 3326 | relayd->sessiond_session_id = sessiond_id; |
0d08d75e | 3327 | relayd_created = 1; |
7735ef9e | 3328 | } |
0d08d75e DG |
3329 | |
3330 | /* | |
3331 | * This code path MUST continue to the consumer send status message to | |
3332 | * we can notify the session daemon and continue our work without | |
3333 | * killing everything. | |
3334 | */ | |
da009f2c MD |
3335 | } else { |
3336 | /* | |
3337 | * relayd key should never be found for control socket. | |
3338 | */ | |
3339 | assert(sock_type != LTTNG_STREAM_CONTROL); | |
0d08d75e DG |
3340 | } |
3341 | ||
3342 | /* First send a status message before receiving the fds. */ | |
0c759fc9 | 3343 | ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS); |
618a6a28 | 3344 | if (ret < 0) { |
0d08d75e | 3345 | /* Somehow, the session daemon is not responding anymore. */ |
618a6a28 MD |
3346 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL); |
3347 | goto error_nosignal; | |
7735ef9e DG |
3348 | } |
3349 | ||
3350 | /* Poll on consumer socket. */ | |
84382d49 MD |
3351 | ret = lttng_consumer_poll_socket(consumer_sockpoll); |
3352 | if (ret) { | |
3353 | /* Needing to exit in the middle of a command: error. */ | |
0d08d75e | 3354 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
7735ef9e | 3355 | ret = -EINTR; |
618a6a28 | 3356 | goto error_nosignal; |
7735ef9e DG |
3357 | } |
3358 | ||
3359 | /* Get relayd socket from session daemon */ | |
3360 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); | |
3361 | if (ret != sizeof(fd)) { | |
7735ef9e | 3362 | ret = -1; |
4028eeb9 | 3363 | fd = -1; /* Just in case it gets set with an invalid value. */ |
0d08d75e DG |
3364 | |
3365 | /* | |
3366 | * Failing to receive FDs might indicate a major problem such as | |
3367 | * reaching a fd limit during the receive where the kernel returns a | |
3368 | * MSG_CTRUNC and fails to cleanup the fd in the queue. Any case, we | |
3369 | * don't take any chances and stop everything. | |
3370 | * | |
3371 | * XXX: Feature request #558 will fix that and avoid this possible | |
3372 | * issue when reaching the fd limit. | |
3373 | */ | |
3374 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); | |
618a6a28 | 3375 | ret_code = LTTCOMM_CONSUMERD_ERROR_RECV_FD; |
f50f23d9 DG |
3376 | goto error; |
3377 | } | |
3378 | ||
7735ef9e DG |
3379 | /* Copy socket information and received FD */ |
3380 | switch (sock_type) { | |
3381 | case LTTNG_STREAM_CONTROL: | |
3382 | /* Copy received lttcomm socket */ | |
6151a90f JD |
3383 | lttcomm_copy_sock(&relayd->control_sock.sock, &relayd_sock->sock); |
3384 | ret = lttcomm_create_sock(&relayd->control_sock.sock); | |
4028eeb9 | 3385 | /* Handle create_sock error. */ |
f66c074c | 3386 | if (ret < 0) { |
618a6a28 | 3387 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; |
4028eeb9 | 3388 | goto error; |
f66c074c | 3389 | } |
da009f2c MD |
3390 | /* |
3391 | * Close the socket created internally by | |
3392 | * lttcomm_create_sock, so we can replace it by the one | |
3393 | * received from sessiond. | |
3394 | */ | |
3395 | if (close(relayd->control_sock.sock.fd)) { | |
3396 | PERROR("close"); | |
3397 | } | |
7735ef9e DG |
3398 | |
3399 | /* Assign new file descriptor */ | |
6151a90f | 3400 | relayd->control_sock.sock.fd = fd; |
4b29f1ce | 3401 | fd = -1; /* For error path */ |
6151a90f JD |
3402 | /* Assign version values. */ |
3403 | relayd->control_sock.major = relayd_sock->major; | |
3404 | relayd->control_sock.minor = relayd_sock->minor; | |
c5b6f4f0 | 3405 | |
d3e2ba59 | 3406 | relayd->relayd_session_id = relayd_session_id; |
c5b6f4f0 | 3407 | |
7735ef9e DG |
3408 | break; |
3409 | case LTTNG_STREAM_DATA: | |
3410 | /* Copy received lttcomm socket */ | |
6151a90f JD |
3411 | lttcomm_copy_sock(&relayd->data_sock.sock, &relayd_sock->sock); |
3412 | ret = lttcomm_create_sock(&relayd->data_sock.sock); | |
4028eeb9 | 3413 | /* Handle create_sock error. */ |
f66c074c | 3414 | if (ret < 0) { |
618a6a28 | 3415 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; |
4028eeb9 | 3416 | goto error; |
f66c074c | 3417 | } |
da009f2c MD |
3418 | /* |
3419 | * Close the socket created internally by | |
3420 | * lttcomm_create_sock, so we can replace it by the one | |
3421 | * received from sessiond. | |
3422 | */ | |
3423 | if (close(relayd->data_sock.sock.fd)) { | |
3424 | PERROR("close"); | |
3425 | } | |
7735ef9e DG |
3426 | |
3427 | /* Assign new file descriptor */ | |
6151a90f | 3428 | relayd->data_sock.sock.fd = fd; |
4b29f1ce | 3429 | fd = -1; /* for eventual error paths */ |
6151a90f JD |
3430 | /* Assign version values. */ |
3431 | relayd->data_sock.major = relayd_sock->major; | |
3432 | relayd->data_sock.minor = relayd_sock->minor; | |
7735ef9e DG |
3433 | break; |
3434 | default: | |
3435 | ERR("Unknown relayd socket type (%d)", sock_type); | |
59e71485 | 3436 | ret = -1; |
618a6a28 | 3437 | ret_code = LTTCOMM_CONSUMERD_FATAL; |
7735ef9e DG |
3438 | goto error; |
3439 | } | |
3440 | ||
d88aee68 | 3441 | DBG("Consumer %s socket created successfully with net idx %" PRIu64 " (fd: %d)", |
7735ef9e DG |
3442 | sock_type == LTTNG_STREAM_CONTROL ? "control" : "data", |
3443 | relayd->net_seq_idx, fd); | |
3444 | ||
618a6a28 MD |
3445 | /* We successfully added the socket. Send status back. */ |
3446 | ret = consumer_send_status_msg(sock, ret_code); | |
3447 | if (ret < 0) { | |
3448 | /* Somehow, the session daemon is not responding anymore. */ | |
3449 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL); | |
3450 | goto error_nosignal; | |
3451 | } | |
3452 | ||
7735ef9e DG |
3453 | /* |
3454 | * Add relayd socket pair to consumer data hashtable. If object already | |
3455 | * exists or on error, the function gracefully returns. | |
3456 | */ | |
d09e1200 | 3457 | add_relayd(relayd); |
7735ef9e DG |
3458 | |
3459 | /* All good! */ | |
4028eeb9 | 3460 | return 0; |
7735ef9e DG |
3461 | |
3462 | error: | |
618a6a28 MD |
3463 | if (consumer_send_status_msg(sock, ret_code) < 0) { |
3464 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL); | |
3465 | } | |
3466 | ||
3467 | error_nosignal: | |
4028eeb9 DG |
3468 | /* Close received socket if valid. */ |
3469 | if (fd >= 0) { | |
3470 | if (close(fd)) { | |
3471 | PERROR("close received socket"); | |
3472 | } | |
3473 | } | |
cd2b09ed DG |
3474 | |
3475 | if (relayd_created) { | |
cd2b09ed DG |
3476 | free(relayd); |
3477 | } | |
3478 | ||
7735ef9e DG |
3479 | return ret; |
3480 | } | |
ca22feea | 3481 | |
4e9a4686 DG |
3482 | /* |
3483 | * Try to lock the stream mutex. | |
3484 | * | |
3485 | * On success, 1 is returned else 0 indicating that the mutex is NOT lock. | |
3486 | */ | |
3487 | static int stream_try_lock(struct lttng_consumer_stream *stream) | |
3488 | { | |
3489 | int ret; | |
3490 | ||
3491 | assert(stream); | |
3492 | ||
3493 | /* | |
3494 | * Try to lock the stream mutex. On failure, we know that the stream is | |
3495 | * being used else where hence there is data still being extracted. | |
3496 | */ | |
3497 | ret = pthread_mutex_trylock(&stream->lock); | |
3498 | if (ret) { | |
3499 | /* For both EBUSY and EINVAL error, the mutex is NOT locked. */ | |
3500 | ret = 0; | |
3501 | goto end; | |
3502 | } | |
3503 | ||
3504 | ret = 1; | |
3505 | ||
3506 | end: | |
3507 | return ret; | |
3508 | } | |
3509 | ||
f7079f67 DG |
3510 | /* |
3511 | * Search for a relayd associated to the session id and return the reference. | |
3512 | * | |
3513 | * A rcu read side lock MUST be acquire before calling this function and locked | |
3514 | * until the relayd object is no longer necessary. | |
3515 | */ | |
3516 | static struct consumer_relayd_sock_pair *find_relayd_by_session_id(uint64_t id) | |
3517 | { | |
3518 | struct lttng_ht_iter iter; | |
f7079f67 | 3519 | struct consumer_relayd_sock_pair *relayd = NULL; |
f7079f67 DG |
3520 | |
3521 | /* Iterate over all relayd since they are indexed by net_seq_idx. */ | |
3522 | cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd, | |
3523 | node.node) { | |
18261bd1 DG |
3524 | /* |
3525 | * Check by sessiond id which is unique here where the relayd session | |
3526 | * id might not be when having multiple relayd. | |
3527 | */ | |
3528 | if (relayd->sessiond_session_id == id) { | |
f7079f67 | 3529 | /* Found the relayd. There can be only one per id. */ |
18261bd1 | 3530 | goto found; |
f7079f67 DG |
3531 | } |
3532 | } | |
3533 | ||
18261bd1 DG |
3534 | return NULL; |
3535 | ||
3536 | found: | |
f7079f67 DG |
3537 | return relayd; |
3538 | } | |
3539 | ||
ca22feea DG |
3540 | /* |
3541 | * Check if for a given session id there is still data needed to be extract | |
3542 | * from the buffers. | |
3543 | * | |
6d805429 | 3544 | * Return 1 if data is pending or else 0 meaning ready to be read. |
ca22feea | 3545 | */ |
6d805429 | 3546 | int consumer_data_pending(uint64_t id) |
ca22feea DG |
3547 | { |
3548 | int ret; | |
3549 | struct lttng_ht_iter iter; | |
3550 | struct lttng_ht *ht; | |
3551 | struct lttng_consumer_stream *stream; | |
f7079f67 | 3552 | struct consumer_relayd_sock_pair *relayd = NULL; |
6d805429 | 3553 | int (*data_pending)(struct lttng_consumer_stream *); |
ca22feea | 3554 | |
6d805429 | 3555 | DBG("Consumer data pending command on session id %" PRIu64, id); |
ca22feea | 3556 | |
6f6eda74 | 3557 | rcu_read_lock(); |
ca22feea DG |
3558 | pthread_mutex_lock(&consumer_data.lock); |
3559 | ||
3560 | switch (consumer_data.type) { | |
3561 | case LTTNG_CONSUMER_KERNEL: | |
6d805429 | 3562 | data_pending = lttng_kconsumer_data_pending; |
ca22feea DG |
3563 | break; |
3564 | case LTTNG_CONSUMER32_UST: | |
3565 | case LTTNG_CONSUMER64_UST: | |
6d805429 | 3566 | data_pending = lttng_ustconsumer_data_pending; |
ca22feea DG |
3567 | break; |
3568 | default: | |
3569 | ERR("Unknown consumer data type"); | |
3570 | assert(0); | |
3571 | } | |
3572 | ||
3573 | /* Ease our life a bit */ | |
3574 | ht = consumer_data.stream_list_ht; | |
3575 | ||
f7079f67 DG |
3576 | relayd = find_relayd_by_session_id(id); |
3577 | if (relayd) { | |
3578 | /* Send init command for data pending. */ | |
3579 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
3580 | ret = relayd_begin_data_pending(&relayd->control_sock, | |
3581 | relayd->relayd_session_id); | |
3582 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
3583 | if (ret < 0) { | |
3584 | /* Communication error thus the relayd so no data pending. */ | |
3585 | goto data_not_pending; | |
3586 | } | |
3587 | } | |
3588 | ||
c8f59ee5 | 3589 | cds_lfht_for_each_entry_duplicate(ht->ht, |
d88aee68 DG |
3590 | ht->hash_fct(&id, lttng_ht_seed), |
3591 | ht->match_fct, &id, | |
ca22feea | 3592 | &iter.iter, stream, node_session_id.node) { |
4e9a4686 DG |
3593 | /* If this call fails, the stream is being used hence data pending. */ |
3594 | ret = stream_try_lock(stream); | |
3595 | if (!ret) { | |
f7079f67 | 3596 | goto data_pending; |
ca22feea | 3597 | } |
ca22feea | 3598 | |
4e9a4686 DG |
3599 | /* |
3600 | * A removed node from the hash table indicates that the stream has | |
3601 | * been deleted thus having a guarantee that the buffers are closed | |
3602 | * on the consumer side. However, data can still be transmitted | |
3603 | * over the network so don't skip the relayd check. | |
3604 | */ | |
3605 | ret = cds_lfht_is_node_deleted(&stream->node.node); | |
3606 | if (!ret) { | |
3607 | /* Check the stream if there is data in the buffers. */ | |
6d805429 DG |
3608 | ret = data_pending(stream); |
3609 | if (ret == 1) { | |
4e9a4686 | 3610 | pthread_mutex_unlock(&stream->lock); |
f7079f67 | 3611 | goto data_pending; |
4e9a4686 DG |
3612 | } |
3613 | } | |
3614 | ||
3615 | /* Relayd check */ | |
f7079f67 | 3616 | if (relayd) { |
c8f59ee5 DG |
3617 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); |
3618 | if (stream->metadata_flag) { | |
ad7051c0 DG |
3619 | ret = relayd_quiescent_control(&relayd->control_sock, |
3620 | stream->relayd_stream_id); | |
c8f59ee5 | 3621 | } else { |
6d805429 | 3622 | ret = relayd_data_pending(&relayd->control_sock, |
39df6d9f DG |
3623 | stream->relayd_stream_id, |
3624 | stream->next_net_seq_num - 1); | |
c8f59ee5 DG |
3625 | } |
3626 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
6d805429 | 3627 | if (ret == 1) { |
4e9a4686 | 3628 | pthread_mutex_unlock(&stream->lock); |
f7079f67 | 3629 | goto data_pending; |
c8f59ee5 DG |
3630 | } |
3631 | } | |
4e9a4686 | 3632 | pthread_mutex_unlock(&stream->lock); |
c8f59ee5 | 3633 | } |
ca22feea | 3634 | |
f7079f67 DG |
3635 | if (relayd) { |
3636 | unsigned int is_data_inflight = 0; | |
3637 | ||
3638 | /* Send init command for data pending. */ | |
3639 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
3640 | ret = relayd_end_data_pending(&relayd->control_sock, | |
3641 | relayd->relayd_session_id, &is_data_inflight); | |
3642 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
bdd88757 | 3643 | if (ret < 0) { |
f7079f67 DG |
3644 | goto data_not_pending; |
3645 | } | |
bdd88757 DG |
3646 | if (is_data_inflight) { |
3647 | goto data_pending; | |
3648 | } | |
f7079f67 DG |
3649 | } |
3650 | ||
ca22feea | 3651 | /* |
f7079f67 DG |
3652 | * Finding _no_ node in the hash table and no inflight data means that the |
3653 | * stream(s) have been removed thus data is guaranteed to be available for | |
3654 | * analysis from the trace files. | |
ca22feea DG |
3655 | */ |
3656 | ||
f7079f67 | 3657 | data_not_pending: |
ca22feea DG |
3658 | /* Data is available to be read by a viewer. */ |
3659 | pthread_mutex_unlock(&consumer_data.lock); | |
c8f59ee5 | 3660 | rcu_read_unlock(); |
6d805429 | 3661 | return 0; |
ca22feea | 3662 | |
f7079f67 | 3663 | data_pending: |
ca22feea DG |
3664 | /* Data is still being extracted from buffers. */ |
3665 | pthread_mutex_unlock(&consumer_data.lock); | |
c8f59ee5 | 3666 | rcu_read_unlock(); |
6d805429 | 3667 | return 1; |
ca22feea | 3668 | } |
f50f23d9 DG |
3669 | |
3670 | /* | |
3671 | * Send a ret code status message to the sessiond daemon. | |
3672 | * | |
3673 | * Return the sendmsg() return value. | |
3674 | */ | |
3675 | int consumer_send_status_msg(int sock, int ret_code) | |
3676 | { | |
3677 | struct lttcomm_consumer_status_msg msg; | |
3678 | ||
53efb85a | 3679 | memset(&msg, 0, sizeof(msg)); |
f50f23d9 DG |
3680 | msg.ret_code = ret_code; |
3681 | ||
3682 | return lttcomm_send_unix_sock(sock, &msg, sizeof(msg)); | |
3683 | } | |
ffe60014 DG |
3684 | |
3685 | /* | |
3686 | * Send a channel status message to the sessiond daemon. | |
3687 | * | |
3688 | * Return the sendmsg() return value. | |
3689 | */ | |
3690 | int consumer_send_status_channel(int sock, | |
3691 | struct lttng_consumer_channel *channel) | |
3692 | { | |
3693 | struct lttcomm_consumer_status_channel msg; | |
3694 | ||
3695 | assert(sock >= 0); | |
3696 | ||
53efb85a | 3697 | memset(&msg, 0, sizeof(msg)); |
ffe60014 | 3698 | if (!channel) { |
0c759fc9 | 3699 | msg.ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; |
ffe60014 | 3700 | } else { |
0c759fc9 | 3701 | msg.ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
ffe60014 DG |
3702 | msg.key = channel->key; |
3703 | msg.stream_count = channel->streams.count; | |
3704 | } | |
3705 | ||
3706 | return lttcomm_send_unix_sock(sock, &msg, sizeof(msg)); | |
3707 | } | |
5c786ded | 3708 | |
d07ceecd MD |
3709 | unsigned long consumer_get_consume_start_pos(unsigned long consumed_pos, |
3710 | unsigned long produced_pos, uint64_t nb_packets_per_stream, | |
3711 | uint64_t max_sb_size) | |
5c786ded | 3712 | { |
d07ceecd | 3713 | unsigned long start_pos; |
5c786ded | 3714 | |
d07ceecd MD |
3715 | if (!nb_packets_per_stream) { |
3716 | return consumed_pos; /* Grab everything */ | |
3717 | } | |
3718 | start_pos = produced_pos - offset_align_floor(produced_pos, max_sb_size); | |
3719 | start_pos -= max_sb_size * nb_packets_per_stream; | |
3720 | if ((long) (start_pos - consumed_pos) < 0) { | |
3721 | return consumed_pos; /* Grab everything */ | |
3722 | } | |
3723 | return start_pos; | |
5c786ded | 3724 | } |