Commit | Line | Data |
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3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
00e2e675 | 4 | * 2012 - David Goulet <dgoulet@efficios.com> |
3bd1e081 | 5 | * |
d14d33bf AM |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License, version 2 only, | |
8 | * as published by the Free Software Foundation. | |
3bd1e081 | 9 | * |
d14d33bf AM |
10 | * This program is distributed in the hope that it will be useful, but WITHOUT |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
3bd1e081 | 14 | * |
d14d33bf AM |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
3bd1e081 MD |
18 | */ |
19 | ||
20 | #define _GNU_SOURCE | |
21 | #include <assert.h> | |
3bd1e081 MD |
22 | #include <poll.h> |
23 | #include <pthread.h> | |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | #include <sys/mman.h> | |
27 | #include <sys/socket.h> | |
28 | #include <sys/types.h> | |
29 | #include <unistd.h> | |
77c7c900 | 30 | #include <inttypes.h> |
331744e3 | 31 | #include <signal.h> |
3bd1e081 | 32 | |
51a9e1c7 | 33 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 34 | #include <common/common.h> |
fb3a43a9 DG |
35 | #include <common/utils.h> |
36 | #include <common/compat/poll.h> | |
309167d2 | 37 | #include <common/index/index.h> |
10a8a223 | 38 | #include <common/kernel-ctl/kernel-ctl.h> |
00e2e675 | 39 | #include <common/sessiond-comm/relayd.h> |
10a8a223 DG |
40 | #include <common/sessiond-comm/sessiond-comm.h> |
41 | #include <common/kernel-consumer/kernel-consumer.h> | |
00e2e675 | 42 | #include <common/relayd/relayd.h> |
10a8a223 | 43 | #include <common/ust-consumer/ust-consumer.h> |
d3e2ba59 | 44 | #include <common/consumer-timer.h> |
10a8a223 DG |
45 | |
46 | #include "consumer.h" | |
1d1a276c | 47 | #include "consumer-stream.h" |
2d57de81 | 48 | #include "consumer-testpoint.h" |
3bd1e081 MD |
49 | |
50 | struct lttng_consumer_global_data consumer_data = { | |
3bd1e081 MD |
51 | .stream_count = 0, |
52 | .need_update = 1, | |
53 | .type = LTTNG_CONSUMER_UNKNOWN, | |
54 | }; | |
55 | ||
d8ef542d MD |
56 | enum consumer_channel_action { |
57 | CONSUMER_CHANNEL_ADD, | |
a0cbdd2e | 58 | CONSUMER_CHANNEL_DEL, |
d8ef542d MD |
59 | CONSUMER_CHANNEL_QUIT, |
60 | }; | |
61 | ||
62 | struct consumer_channel_msg { | |
63 | enum consumer_channel_action action; | |
a0cbdd2e MD |
64 | struct lttng_consumer_channel *chan; /* add */ |
65 | uint64_t key; /* del */ | |
d8ef542d MD |
66 | }; |
67 | ||
3bd1e081 MD |
68 | /* |
69 | * Flag to inform the polling thread to quit when all fd hung up. Updated by | |
70 | * the consumer_thread_receive_fds when it notices that all fds has hung up. | |
71 | * Also updated by the signal handler (consumer_should_exit()). Read by the | |
72 | * polling threads. | |
73 | */ | |
a98dae5f | 74 | volatile int consumer_quit; |
3bd1e081 | 75 | |
43c34bc3 | 76 | /* |
43c34bc3 DG |
77 | * Global hash table containing respectively metadata and data streams. The |
78 | * stream element in this ht should only be updated by the metadata poll thread | |
79 | * for the metadata and the data poll thread for the data. | |
80 | */ | |
40dc48e0 DG |
81 | static struct lttng_ht *metadata_ht; |
82 | static struct lttng_ht *data_ht; | |
43c34bc3 | 83 | |
acdb9057 DG |
84 | /* |
85 | * Notify a thread lttng pipe to poll back again. This usually means that some | |
86 | * global state has changed so we just send back the thread in a poll wait | |
87 | * call. | |
88 | */ | |
89 | static void notify_thread_lttng_pipe(struct lttng_pipe *pipe) | |
90 | { | |
91 | struct lttng_consumer_stream *null_stream = NULL; | |
92 | ||
93 | assert(pipe); | |
94 | ||
95 | (void) lttng_pipe_write(pipe, &null_stream, sizeof(null_stream)); | |
96 | } | |
97 | ||
5c635c72 MD |
98 | static void notify_health_quit_pipe(int *pipe) |
99 | { | |
6cd525e8 | 100 | ssize_t ret; |
5c635c72 | 101 | |
6cd525e8 MD |
102 | ret = lttng_write(pipe[1], "4", 1); |
103 | if (ret < 1) { | |
5c635c72 MD |
104 | PERROR("write consumer health quit"); |
105 | } | |
106 | } | |
107 | ||
d8ef542d MD |
108 | static void notify_channel_pipe(struct lttng_consumer_local_data *ctx, |
109 | struct lttng_consumer_channel *chan, | |
a0cbdd2e | 110 | uint64_t key, |
d8ef542d MD |
111 | enum consumer_channel_action action) |
112 | { | |
113 | struct consumer_channel_msg msg; | |
6cd525e8 | 114 | ssize_t ret; |
d8ef542d | 115 | |
e56251fc DG |
116 | memset(&msg, 0, sizeof(msg)); |
117 | ||
d8ef542d MD |
118 | msg.action = action; |
119 | msg.chan = chan; | |
f21dae48 | 120 | msg.key = key; |
6cd525e8 MD |
121 | ret = lttng_write(ctx->consumer_channel_pipe[1], &msg, sizeof(msg)); |
122 | if (ret < sizeof(msg)) { | |
123 | PERROR("notify_channel_pipe write error"); | |
124 | } | |
d8ef542d MD |
125 | } |
126 | ||
a0cbdd2e MD |
127 | void notify_thread_del_channel(struct lttng_consumer_local_data *ctx, |
128 | uint64_t key) | |
129 | { | |
130 | notify_channel_pipe(ctx, NULL, key, CONSUMER_CHANNEL_DEL); | |
131 | } | |
132 | ||
d8ef542d MD |
133 | static int read_channel_pipe(struct lttng_consumer_local_data *ctx, |
134 | struct lttng_consumer_channel **chan, | |
a0cbdd2e | 135 | uint64_t *key, |
d8ef542d MD |
136 | enum consumer_channel_action *action) |
137 | { | |
138 | struct consumer_channel_msg msg; | |
6cd525e8 | 139 | ssize_t ret; |
d8ef542d | 140 | |
6cd525e8 MD |
141 | ret = lttng_read(ctx->consumer_channel_pipe[0], &msg, sizeof(msg)); |
142 | if (ret < sizeof(msg)) { | |
143 | ret = -1; | |
144 | goto error; | |
d8ef542d | 145 | } |
6cd525e8 MD |
146 | *action = msg.action; |
147 | *chan = msg.chan; | |
148 | *key = msg.key; | |
149 | error: | |
150 | return (int) ret; | |
d8ef542d MD |
151 | } |
152 | ||
212d67a2 DG |
153 | /* |
154 | * Cleanup the stream list of a channel. Those streams are not yet globally | |
155 | * visible | |
156 | */ | |
157 | static void clean_channel_stream_list(struct lttng_consumer_channel *channel) | |
158 | { | |
159 | struct lttng_consumer_stream *stream, *stmp; | |
160 | ||
161 | assert(channel); | |
162 | ||
163 | /* Delete streams that might have been left in the stream list. */ | |
164 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
165 | send_node) { | |
166 | cds_list_del(&stream->send_node); | |
167 | /* | |
168 | * Once a stream is added to this list, the buffers were created so we | |
169 | * have a guarantee that this call will succeed. Setting the monitor | |
170 | * mode to 0 so we don't lock nor try to delete the stream from the | |
171 | * global hash table. | |
172 | */ | |
173 | stream->monitor = 0; | |
174 | consumer_stream_destroy(stream, NULL); | |
175 | } | |
176 | } | |
177 | ||
3bd1e081 MD |
178 | /* |
179 | * Find a stream. The consumer_data.lock must be locked during this | |
180 | * call. | |
181 | */ | |
d88aee68 | 182 | static struct lttng_consumer_stream *find_stream(uint64_t key, |
8389e4f8 | 183 | struct lttng_ht *ht) |
3bd1e081 | 184 | { |
e4421fec | 185 | struct lttng_ht_iter iter; |
d88aee68 | 186 | struct lttng_ht_node_u64 *node; |
e4421fec | 187 | struct lttng_consumer_stream *stream = NULL; |
3bd1e081 | 188 | |
8389e4f8 DG |
189 | assert(ht); |
190 | ||
d88aee68 DG |
191 | /* -1ULL keys are lookup failures */ |
192 | if (key == (uint64_t) -1ULL) { | |
7ad0a0cb | 193 | return NULL; |
7a57cf92 | 194 | } |
e4421fec | 195 | |
6065ceec DG |
196 | rcu_read_lock(); |
197 | ||
d88aee68 DG |
198 | lttng_ht_lookup(ht, &key, &iter); |
199 | node = lttng_ht_iter_get_node_u64(&iter); | |
e4421fec DG |
200 | if (node != NULL) { |
201 | stream = caa_container_of(node, struct lttng_consumer_stream, node); | |
3bd1e081 | 202 | } |
e4421fec | 203 | |
6065ceec DG |
204 | rcu_read_unlock(); |
205 | ||
e4421fec | 206 | return stream; |
3bd1e081 MD |
207 | } |
208 | ||
da009f2c | 209 | static void steal_stream_key(uint64_t key, struct lttng_ht *ht) |
7ad0a0cb MD |
210 | { |
211 | struct lttng_consumer_stream *stream; | |
212 | ||
04253271 | 213 | rcu_read_lock(); |
ffe60014 | 214 | stream = find_stream(key, ht); |
04253271 | 215 | if (stream) { |
da009f2c | 216 | stream->key = (uint64_t) -1ULL; |
04253271 MD |
217 | /* |
218 | * We don't want the lookup to match, but we still need | |
219 | * to iterate on this stream when iterating over the hash table. Just | |
220 | * change the node key. | |
221 | */ | |
da009f2c | 222 | stream->node.key = (uint64_t) -1ULL; |
04253271 MD |
223 | } |
224 | rcu_read_unlock(); | |
7ad0a0cb MD |
225 | } |
226 | ||
d56db448 DG |
227 | /* |
228 | * Return a channel object for the given key. | |
229 | * | |
230 | * RCU read side lock MUST be acquired before calling this function and | |
231 | * protects the channel ptr. | |
232 | */ | |
d88aee68 | 233 | struct lttng_consumer_channel *consumer_find_channel(uint64_t key) |
3bd1e081 | 234 | { |
e4421fec | 235 | struct lttng_ht_iter iter; |
d88aee68 | 236 | struct lttng_ht_node_u64 *node; |
e4421fec | 237 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 | 238 | |
d88aee68 DG |
239 | /* -1ULL keys are lookup failures */ |
240 | if (key == (uint64_t) -1ULL) { | |
7ad0a0cb | 241 | return NULL; |
7a57cf92 | 242 | } |
e4421fec | 243 | |
d88aee68 DG |
244 | lttng_ht_lookup(consumer_data.channel_ht, &key, &iter); |
245 | node = lttng_ht_iter_get_node_u64(&iter); | |
e4421fec DG |
246 | if (node != NULL) { |
247 | channel = caa_container_of(node, struct lttng_consumer_channel, node); | |
3bd1e081 | 248 | } |
e4421fec DG |
249 | |
250 | return channel; | |
3bd1e081 MD |
251 | } |
252 | ||
b5a6470f DG |
253 | /* |
254 | * There is a possibility that the consumer does not have enough time between | |
255 | * the close of the channel on the session daemon and the cleanup in here thus | |
256 | * once we have a channel add with an existing key, we know for sure that this | |
257 | * channel will eventually get cleaned up by all streams being closed. | |
258 | * | |
259 | * This function just nullifies the already existing channel key. | |
260 | */ | |
261 | static void steal_channel_key(uint64_t key) | |
262 | { | |
263 | struct lttng_consumer_channel *channel; | |
264 | ||
265 | rcu_read_lock(); | |
266 | channel = consumer_find_channel(key); | |
267 | if (channel) { | |
268 | channel->key = (uint64_t) -1ULL; | |
269 | /* | |
270 | * We don't want the lookup to match, but we still need to iterate on | |
271 | * this channel when iterating over the hash table. Just change the | |
272 | * node key. | |
273 | */ | |
274 | channel->node.key = (uint64_t) -1ULL; | |
275 | } | |
276 | rcu_read_unlock(); | |
277 | } | |
278 | ||
ffe60014 | 279 | static void free_channel_rcu(struct rcu_head *head) |
702b1ea4 | 280 | { |
d88aee68 DG |
281 | struct lttng_ht_node_u64 *node = |
282 | caa_container_of(head, struct lttng_ht_node_u64, head); | |
ffe60014 DG |
283 | struct lttng_consumer_channel *channel = |
284 | caa_container_of(node, struct lttng_consumer_channel, node); | |
702b1ea4 | 285 | |
ffe60014 | 286 | free(channel); |
702b1ea4 MD |
287 | } |
288 | ||
00e2e675 DG |
289 | /* |
290 | * RCU protected relayd socket pair free. | |
291 | */ | |
ffe60014 | 292 | static void free_relayd_rcu(struct rcu_head *head) |
00e2e675 | 293 | { |
d88aee68 DG |
294 | struct lttng_ht_node_u64 *node = |
295 | caa_container_of(head, struct lttng_ht_node_u64, head); | |
00e2e675 DG |
296 | struct consumer_relayd_sock_pair *relayd = |
297 | caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
298 | ||
8994307f DG |
299 | /* |
300 | * Close all sockets. This is done in the call RCU since we don't want the | |
301 | * socket fds to be reassigned thus potentially creating bad state of the | |
302 | * relayd object. | |
303 | * | |
304 | * We do not have to lock the control socket mutex here since at this stage | |
305 | * there is no one referencing to this relayd object. | |
306 | */ | |
307 | (void) relayd_close(&relayd->control_sock); | |
308 | (void) relayd_close(&relayd->data_sock); | |
309 | ||
00e2e675 DG |
310 | free(relayd); |
311 | } | |
312 | ||
313 | /* | |
314 | * Destroy and free relayd socket pair object. | |
00e2e675 | 315 | */ |
51230d70 | 316 | void consumer_destroy_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
317 | { |
318 | int ret; | |
319 | struct lttng_ht_iter iter; | |
320 | ||
173af62f DG |
321 | if (relayd == NULL) { |
322 | return; | |
323 | } | |
324 | ||
00e2e675 DG |
325 | DBG("Consumer destroy and close relayd socket pair"); |
326 | ||
327 | iter.iter.node = &relayd->node.node; | |
328 | ret = lttng_ht_del(consumer_data.relayd_ht, &iter); | |
173af62f | 329 | if (ret != 0) { |
8994307f | 330 | /* We assume the relayd is being or is destroyed */ |
173af62f DG |
331 | return; |
332 | } | |
00e2e675 | 333 | |
00e2e675 | 334 | /* RCU free() call */ |
ffe60014 DG |
335 | call_rcu(&relayd->node.head, free_relayd_rcu); |
336 | } | |
337 | ||
338 | /* | |
339 | * Remove a channel from the global list protected by a mutex. This function is | |
340 | * also responsible for freeing its data structures. | |
341 | */ | |
342 | void consumer_del_channel(struct lttng_consumer_channel *channel) | |
343 | { | |
344 | int ret; | |
345 | struct lttng_ht_iter iter; | |
346 | ||
d88aee68 | 347 | DBG("Consumer delete channel key %" PRIu64, channel->key); |
ffe60014 DG |
348 | |
349 | pthread_mutex_lock(&consumer_data.lock); | |
a9838785 | 350 | pthread_mutex_lock(&channel->lock); |
ffe60014 | 351 | |
212d67a2 DG |
352 | /* Destroy streams that might have been left in the stream list. */ |
353 | clean_channel_stream_list(channel); | |
51e762e5 | 354 | |
d3e2ba59 JD |
355 | if (channel->live_timer_enabled == 1) { |
356 | consumer_timer_live_stop(channel); | |
357 | } | |
358 | ||
ffe60014 DG |
359 | switch (consumer_data.type) { |
360 | case LTTNG_CONSUMER_KERNEL: | |
361 | break; | |
362 | case LTTNG_CONSUMER32_UST: | |
363 | case LTTNG_CONSUMER64_UST: | |
364 | lttng_ustconsumer_del_channel(channel); | |
365 | break; | |
366 | default: | |
367 | ERR("Unknown consumer_data type"); | |
368 | assert(0); | |
369 | goto end; | |
370 | } | |
371 | ||
372 | rcu_read_lock(); | |
373 | iter.iter.node = &channel->node.node; | |
374 | ret = lttng_ht_del(consumer_data.channel_ht, &iter); | |
375 | assert(!ret); | |
376 | rcu_read_unlock(); | |
377 | ||
378 | call_rcu(&channel->node.head, free_channel_rcu); | |
379 | end: | |
a9838785 | 380 | pthread_mutex_unlock(&channel->lock); |
ffe60014 | 381 | pthread_mutex_unlock(&consumer_data.lock); |
00e2e675 DG |
382 | } |
383 | ||
228b5bf7 DG |
384 | /* |
385 | * Iterate over the relayd hash table and destroy each element. Finally, | |
386 | * destroy the whole hash table. | |
387 | */ | |
388 | static void cleanup_relayd_ht(void) | |
389 | { | |
390 | struct lttng_ht_iter iter; | |
391 | struct consumer_relayd_sock_pair *relayd; | |
392 | ||
393 | rcu_read_lock(); | |
394 | ||
395 | cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd, | |
396 | node.node) { | |
51230d70 | 397 | consumer_destroy_relayd(relayd); |
228b5bf7 DG |
398 | } |
399 | ||
228b5bf7 | 400 | rcu_read_unlock(); |
36b588ed MD |
401 | |
402 | lttng_ht_destroy(consumer_data.relayd_ht); | |
228b5bf7 DG |
403 | } |
404 | ||
8994307f DG |
405 | /* |
406 | * Update the end point status of all streams having the given network sequence | |
407 | * index (relayd index). | |
408 | * | |
409 | * It's atomically set without having the stream mutex locked which is fine | |
410 | * because we handle the write/read race with a pipe wakeup for each thread. | |
411 | */ | |
da009f2c | 412 | static void update_endpoint_status_by_netidx(uint64_t net_seq_idx, |
8994307f DG |
413 | enum consumer_endpoint_status status) |
414 | { | |
415 | struct lttng_ht_iter iter; | |
416 | struct lttng_consumer_stream *stream; | |
417 | ||
da009f2c | 418 | DBG("Consumer set delete flag on stream by idx %" PRIu64, net_seq_idx); |
8994307f DG |
419 | |
420 | rcu_read_lock(); | |
421 | ||
422 | /* Let's begin with metadata */ | |
423 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) { | |
424 | if (stream->net_seq_idx == net_seq_idx) { | |
425 | uatomic_set(&stream->endpoint_status, status); | |
426 | DBG("Delete flag set to metadata stream %d", stream->wait_fd); | |
427 | } | |
428 | } | |
429 | ||
430 | /* Follow up by the data streams */ | |
431 | cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) { | |
432 | if (stream->net_seq_idx == net_seq_idx) { | |
433 | uatomic_set(&stream->endpoint_status, status); | |
434 | DBG("Delete flag set to data stream %d", stream->wait_fd); | |
435 | } | |
436 | } | |
437 | rcu_read_unlock(); | |
438 | } | |
439 | ||
440 | /* | |
441 | * Cleanup a relayd object by flagging every associated streams for deletion, | |
442 | * destroying the object meaning removing it from the relayd hash table, | |
443 | * closing the sockets and freeing the memory in a RCU call. | |
444 | * | |
445 | * If a local data context is available, notify the threads that the streams' | |
446 | * state have changed. | |
447 | */ | |
448 | static void cleanup_relayd(struct consumer_relayd_sock_pair *relayd, | |
449 | struct lttng_consumer_local_data *ctx) | |
450 | { | |
da009f2c | 451 | uint64_t netidx; |
8994307f DG |
452 | |
453 | assert(relayd); | |
454 | ||
9617607b DG |
455 | DBG("Cleaning up relayd sockets"); |
456 | ||
8994307f DG |
457 | /* Save the net sequence index before destroying the object */ |
458 | netidx = relayd->net_seq_idx; | |
459 | ||
460 | /* | |
461 | * Delete the relayd from the relayd hash table, close the sockets and free | |
462 | * the object in a RCU call. | |
463 | */ | |
51230d70 | 464 | consumer_destroy_relayd(relayd); |
8994307f DG |
465 | |
466 | /* Set inactive endpoint to all streams */ | |
467 | update_endpoint_status_by_netidx(netidx, CONSUMER_ENDPOINT_INACTIVE); | |
468 | ||
469 | /* | |
470 | * With a local data context, notify the threads that the streams' state | |
471 | * have changed. The write() action on the pipe acts as an "implicit" | |
472 | * memory barrier ordering the updates of the end point status from the | |
473 | * read of this status which happens AFTER receiving this notify. | |
474 | */ | |
475 | if (ctx) { | |
acdb9057 | 476 | notify_thread_lttng_pipe(ctx->consumer_data_pipe); |
13886d2d | 477 | notify_thread_lttng_pipe(ctx->consumer_metadata_pipe); |
8994307f DG |
478 | } |
479 | } | |
480 | ||
a6ba4fe1 DG |
481 | /* |
482 | * Flag a relayd socket pair for destruction. Destroy it if the refcount | |
483 | * reaches zero. | |
484 | * | |
485 | * RCU read side lock MUST be aquired before calling this function. | |
486 | */ | |
487 | void consumer_flag_relayd_for_destroy(struct consumer_relayd_sock_pair *relayd) | |
488 | { | |
489 | assert(relayd); | |
490 | ||
491 | /* Set destroy flag for this object */ | |
492 | uatomic_set(&relayd->destroy_flag, 1); | |
493 | ||
494 | /* Destroy the relayd if refcount is 0 */ | |
495 | if (uatomic_read(&relayd->refcount) == 0) { | |
51230d70 | 496 | consumer_destroy_relayd(relayd); |
a6ba4fe1 DG |
497 | } |
498 | } | |
499 | ||
3bd1e081 | 500 | /* |
1d1a276c DG |
501 | * Completly destroy stream from every visiable data structure and the given |
502 | * hash table if one. | |
503 | * | |
504 | * One this call returns, the stream object is not longer usable nor visible. | |
3bd1e081 | 505 | */ |
e316aad5 DG |
506 | void consumer_del_stream(struct lttng_consumer_stream *stream, |
507 | struct lttng_ht *ht) | |
3bd1e081 | 508 | { |
1d1a276c | 509 | consumer_stream_destroy(stream, ht); |
3bd1e081 MD |
510 | } |
511 | ||
5ab66908 MD |
512 | /* |
513 | * XXX naming of del vs destroy is all mixed up. | |
514 | */ | |
515 | void consumer_del_stream_for_data(struct lttng_consumer_stream *stream) | |
516 | { | |
517 | consumer_stream_destroy(stream, data_ht); | |
518 | } | |
519 | ||
520 | void consumer_del_stream_for_metadata(struct lttng_consumer_stream *stream) | |
521 | { | |
522 | consumer_stream_destroy(stream, metadata_ht); | |
523 | } | |
524 | ||
d88aee68 DG |
525 | struct lttng_consumer_stream *consumer_allocate_stream(uint64_t channel_key, |
526 | uint64_t stream_key, | |
3bd1e081 | 527 | enum lttng_consumer_stream_state state, |
ffe60014 | 528 | const char *channel_name, |
6df2e2c9 | 529 | uid_t uid, |
00e2e675 | 530 | gid_t gid, |
57a269f2 | 531 | uint64_t relayd_id, |
53632229 | 532 | uint64_t session_id, |
ffe60014 DG |
533 | int cpu, |
534 | int *alloc_ret, | |
4891ece8 DG |
535 | enum consumer_channel_type type, |
536 | unsigned int monitor) | |
3bd1e081 | 537 | { |
ffe60014 | 538 | int ret; |
3bd1e081 | 539 | struct lttng_consumer_stream *stream; |
3bd1e081 | 540 | |
effcf122 | 541 | stream = zmalloc(sizeof(*stream)); |
3bd1e081 | 542 | if (stream == NULL) { |
7a57cf92 | 543 | PERROR("malloc struct lttng_consumer_stream"); |
ffe60014 | 544 | ret = -ENOMEM; |
7a57cf92 | 545 | goto end; |
3bd1e081 | 546 | } |
7a57cf92 | 547 | |
d56db448 DG |
548 | rcu_read_lock(); |
549 | ||
3bd1e081 | 550 | stream->key = stream_key; |
3bd1e081 MD |
551 | stream->out_fd = -1; |
552 | stream->out_fd_offset = 0; | |
e5d1a9b3 | 553 | stream->output_written = 0; |
3bd1e081 | 554 | stream->state = state; |
6df2e2c9 MD |
555 | stream->uid = uid; |
556 | stream->gid = gid; | |
ffe60014 | 557 | stream->net_seq_idx = relayd_id; |
53632229 | 558 | stream->session_id = session_id; |
4891ece8 | 559 | stream->monitor = monitor; |
774d490c | 560 | stream->endpoint_status = CONSUMER_ENDPOINT_ACTIVE; |
309167d2 | 561 | stream->index_fd = -1; |
53632229 | 562 | pthread_mutex_init(&stream->lock, NULL); |
58b1f425 | 563 | |
ffe60014 DG |
564 | /* If channel is the metadata, flag this stream as metadata. */ |
565 | if (type == CONSUMER_CHANNEL_TYPE_METADATA) { | |
566 | stream->metadata_flag = 1; | |
567 | /* Metadata is flat out. */ | |
568 | strncpy(stream->name, DEFAULT_METADATA_NAME, sizeof(stream->name)); | |
94d49140 JD |
569 | /* Live rendez-vous point. */ |
570 | pthread_cond_init(&stream->metadata_rdv, NULL); | |
571 | pthread_mutex_init(&stream->metadata_rdv_lock, NULL); | |
58b1f425 | 572 | } else { |
ffe60014 DG |
573 | /* Format stream name to <channel_name>_<cpu_number> */ |
574 | ret = snprintf(stream->name, sizeof(stream->name), "%s_%d", | |
575 | channel_name, cpu); | |
576 | if (ret < 0) { | |
577 | PERROR("snprintf stream name"); | |
578 | goto error; | |
579 | } | |
58b1f425 | 580 | } |
c30aaa51 | 581 | |
ffe60014 | 582 | /* Key is always the wait_fd for streams. */ |
d88aee68 | 583 | lttng_ht_node_init_u64(&stream->node, stream->key); |
ffe60014 | 584 | |
d8ef542d MD |
585 | /* Init node per channel id key */ |
586 | lttng_ht_node_init_u64(&stream->node_channel_id, channel_key); | |
587 | ||
53632229 | 588 | /* Init session id node with the stream session id */ |
d88aee68 | 589 | lttng_ht_node_init_u64(&stream->node_session_id, stream->session_id); |
53632229 | 590 | |
07b86b52 JD |
591 | DBG3("Allocated stream %s (key %" PRIu64 ", chan_key %" PRIu64 |
592 | " relayd_id %" PRIu64 ", session_id %" PRIu64, | |
593 | stream->name, stream->key, channel_key, | |
594 | stream->net_seq_idx, stream->session_id); | |
d56db448 DG |
595 | |
596 | rcu_read_unlock(); | |
3bd1e081 | 597 | return stream; |
c80048c6 MD |
598 | |
599 | error: | |
d56db448 | 600 | rcu_read_unlock(); |
c80048c6 | 601 | free(stream); |
7a57cf92 | 602 | end: |
ffe60014 DG |
603 | if (alloc_ret) { |
604 | *alloc_ret = ret; | |
605 | } | |
c80048c6 | 606 | return NULL; |
3bd1e081 MD |
607 | } |
608 | ||
609 | /* | |
610 | * Add a stream to the global list protected by a mutex. | |
611 | */ | |
5ab66908 | 612 | int consumer_add_data_stream(struct lttng_consumer_stream *stream) |
3bd1e081 | 613 | { |
5ab66908 | 614 | struct lttng_ht *ht = data_ht; |
3bd1e081 MD |
615 | int ret = 0; |
616 | ||
e316aad5 | 617 | assert(stream); |
43c34bc3 | 618 | assert(ht); |
c77fc10a | 619 | |
d88aee68 | 620 | DBG3("Adding consumer stream %" PRIu64, stream->key); |
e316aad5 DG |
621 | |
622 | pthread_mutex_lock(&consumer_data.lock); | |
a9838785 | 623 | pthread_mutex_lock(&stream->chan->lock); |
ec6ea7d0 | 624 | pthread_mutex_lock(&stream->chan->timer_lock); |
2e818a6a | 625 | pthread_mutex_lock(&stream->lock); |
b0b335c8 | 626 | rcu_read_lock(); |
e316aad5 | 627 | |
43c34bc3 | 628 | /* Steal stream identifier to avoid having streams with the same key */ |
ffe60014 | 629 | steal_stream_key(stream->key, ht); |
43c34bc3 | 630 | |
d88aee68 | 631 | lttng_ht_add_unique_u64(ht, &stream->node); |
00e2e675 | 632 | |
d8ef542d MD |
633 | lttng_ht_add_u64(consumer_data.stream_per_chan_id_ht, |
634 | &stream->node_channel_id); | |
635 | ||
ca22feea DG |
636 | /* |
637 | * Add stream to the stream_list_ht of the consumer data. No need to steal | |
638 | * the key since the HT does not use it and we allow to add redundant keys | |
639 | * into this table. | |
640 | */ | |
d88aee68 | 641 | lttng_ht_add_u64(consumer_data.stream_list_ht, &stream->node_session_id); |
ca22feea | 642 | |
e316aad5 | 643 | /* |
ffe60014 DG |
644 | * When nb_init_stream_left reaches 0, we don't need to trigger any action |
645 | * in terms of destroying the associated channel, because the action that | |
e316aad5 DG |
646 | * causes the count to become 0 also causes a stream to be added. The |
647 | * channel deletion will thus be triggered by the following removal of this | |
648 | * stream. | |
649 | */ | |
ffe60014 | 650 | if (uatomic_read(&stream->chan->nb_init_stream_left) > 0) { |
f2ad556d MD |
651 | /* Increment refcount before decrementing nb_init_stream_left */ |
652 | cmm_smp_wmb(); | |
ffe60014 | 653 | uatomic_dec(&stream->chan->nb_init_stream_left); |
e316aad5 DG |
654 | } |
655 | ||
656 | /* Update consumer data once the node is inserted. */ | |
3bd1e081 MD |
657 | consumer_data.stream_count++; |
658 | consumer_data.need_update = 1; | |
659 | ||
e316aad5 | 660 | rcu_read_unlock(); |
2e818a6a | 661 | pthread_mutex_unlock(&stream->lock); |
ec6ea7d0 | 662 | pthread_mutex_unlock(&stream->chan->timer_lock); |
a9838785 | 663 | pthread_mutex_unlock(&stream->chan->lock); |
3bd1e081 | 664 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 665 | |
3bd1e081 MD |
666 | return ret; |
667 | } | |
668 | ||
5ab66908 MD |
669 | void consumer_del_data_stream(struct lttng_consumer_stream *stream) |
670 | { | |
671 | consumer_del_stream(stream, data_ht); | |
672 | } | |
673 | ||
00e2e675 | 674 | /* |
3f8e211f DG |
675 | * Add relayd socket to global consumer data hashtable. RCU read side lock MUST |
676 | * be acquired before calling this. | |
00e2e675 | 677 | */ |
d09e1200 | 678 | static int add_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
679 | { |
680 | int ret = 0; | |
d88aee68 | 681 | struct lttng_ht_node_u64 *node; |
00e2e675 DG |
682 | struct lttng_ht_iter iter; |
683 | ||
ffe60014 | 684 | assert(relayd); |
00e2e675 | 685 | |
00e2e675 | 686 | lttng_ht_lookup(consumer_data.relayd_ht, |
d88aee68 DG |
687 | &relayd->net_seq_idx, &iter); |
688 | node = lttng_ht_iter_get_node_u64(&iter); | |
00e2e675 | 689 | if (node != NULL) { |
00e2e675 DG |
690 | goto end; |
691 | } | |
d88aee68 | 692 | lttng_ht_add_unique_u64(consumer_data.relayd_ht, &relayd->node); |
00e2e675 | 693 | |
00e2e675 DG |
694 | end: |
695 | return ret; | |
696 | } | |
697 | ||
698 | /* | |
699 | * Allocate and return a consumer relayd socket. | |
700 | */ | |
701 | struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair( | |
da009f2c | 702 | uint64_t net_seq_idx) |
00e2e675 DG |
703 | { |
704 | struct consumer_relayd_sock_pair *obj = NULL; | |
705 | ||
da009f2c MD |
706 | /* net sequence index of -1 is a failure */ |
707 | if (net_seq_idx == (uint64_t) -1ULL) { | |
00e2e675 DG |
708 | goto error; |
709 | } | |
710 | ||
711 | obj = zmalloc(sizeof(struct consumer_relayd_sock_pair)); | |
712 | if (obj == NULL) { | |
713 | PERROR("zmalloc relayd sock"); | |
714 | goto error; | |
715 | } | |
716 | ||
717 | obj->net_seq_idx = net_seq_idx; | |
718 | obj->refcount = 0; | |
173af62f | 719 | obj->destroy_flag = 0; |
f96e4545 MD |
720 | obj->control_sock.sock.fd = -1; |
721 | obj->data_sock.sock.fd = -1; | |
d88aee68 | 722 | lttng_ht_node_init_u64(&obj->node, obj->net_seq_idx); |
00e2e675 DG |
723 | pthread_mutex_init(&obj->ctrl_sock_mutex, NULL); |
724 | ||
725 | error: | |
726 | return obj; | |
727 | } | |
728 | ||
729 | /* | |
730 | * Find a relayd socket pair in the global consumer data. | |
731 | * | |
732 | * Return the object if found else NULL. | |
b0b335c8 MD |
733 | * RCU read-side lock must be held across this call and while using the |
734 | * returned object. | |
00e2e675 | 735 | */ |
d88aee68 | 736 | struct consumer_relayd_sock_pair *consumer_find_relayd(uint64_t key) |
00e2e675 DG |
737 | { |
738 | struct lttng_ht_iter iter; | |
d88aee68 | 739 | struct lttng_ht_node_u64 *node; |
00e2e675 DG |
740 | struct consumer_relayd_sock_pair *relayd = NULL; |
741 | ||
742 | /* Negative keys are lookup failures */ | |
d88aee68 | 743 | if (key == (uint64_t) -1ULL) { |
00e2e675 DG |
744 | goto error; |
745 | } | |
746 | ||
d88aee68 | 747 | lttng_ht_lookup(consumer_data.relayd_ht, &key, |
00e2e675 | 748 | &iter); |
d88aee68 | 749 | node = lttng_ht_iter_get_node_u64(&iter); |
00e2e675 DG |
750 | if (node != NULL) { |
751 | relayd = caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
752 | } | |
753 | ||
00e2e675 DG |
754 | error: |
755 | return relayd; | |
756 | } | |
757 | ||
10a50311 JD |
758 | /* |
759 | * Find a relayd and send the stream | |
760 | * | |
761 | * Returns 0 on success, < 0 on error | |
762 | */ | |
763 | int consumer_send_relayd_stream(struct lttng_consumer_stream *stream, | |
764 | char *path) | |
765 | { | |
766 | int ret = 0; | |
767 | struct consumer_relayd_sock_pair *relayd; | |
768 | ||
769 | assert(stream); | |
770 | assert(stream->net_seq_idx != -1ULL); | |
771 | assert(path); | |
772 | ||
773 | /* The stream is not metadata. Get relayd reference if exists. */ | |
774 | rcu_read_lock(); | |
775 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
776 | if (relayd != NULL) { | |
777 | /* Add stream on the relayd */ | |
778 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
779 | ret = relayd_add_stream(&relayd->control_sock, stream->name, | |
780 | path, &stream->relayd_stream_id, | |
781 | stream->chan->tracefile_size, stream->chan->tracefile_count); | |
782 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
783 | if (ret < 0) { | |
784 | goto end; | |
785 | } | |
1c20f0e2 | 786 | |
10a50311 | 787 | uatomic_inc(&relayd->refcount); |
d01178b6 | 788 | stream->sent_to_relayd = 1; |
10a50311 JD |
789 | } else { |
790 | ERR("Stream %" PRIu64 " relayd ID %" PRIu64 " unknown. Can't send it.", | |
791 | stream->key, stream->net_seq_idx); | |
792 | ret = -1; | |
793 | goto end; | |
794 | } | |
795 | ||
796 | DBG("Stream %s with key %" PRIu64 " sent to relayd id %" PRIu64, | |
797 | stream->name, stream->key, stream->net_seq_idx); | |
798 | ||
799 | end: | |
800 | rcu_read_unlock(); | |
801 | return ret; | |
802 | } | |
803 | ||
a4baae1b JD |
804 | /* |
805 | * Find a relayd and send the streams sent message | |
806 | * | |
807 | * Returns 0 on success, < 0 on error | |
808 | */ | |
809 | int consumer_send_relayd_streams_sent(uint64_t net_seq_idx) | |
810 | { | |
811 | int ret = 0; | |
812 | struct consumer_relayd_sock_pair *relayd; | |
813 | ||
814 | assert(net_seq_idx != -1ULL); | |
815 | ||
816 | /* The stream is not metadata. Get relayd reference if exists. */ | |
817 | rcu_read_lock(); | |
818 | relayd = consumer_find_relayd(net_seq_idx); | |
819 | if (relayd != NULL) { | |
820 | /* Add stream on the relayd */ | |
821 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
822 | ret = relayd_streams_sent(&relayd->control_sock); | |
823 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
824 | if (ret < 0) { | |
825 | goto end; | |
826 | } | |
827 | } else { | |
828 | ERR("Relayd ID %" PRIu64 " unknown. Can't send streams_sent.", | |
829 | net_seq_idx); | |
830 | ret = -1; | |
831 | goto end; | |
832 | } | |
833 | ||
834 | ret = 0; | |
835 | DBG("All streams sent relayd id %" PRIu64, net_seq_idx); | |
836 | ||
837 | end: | |
838 | rcu_read_unlock(); | |
839 | return ret; | |
840 | } | |
841 | ||
10a50311 JD |
842 | /* |
843 | * Find a relayd and close the stream | |
844 | */ | |
845 | void close_relayd_stream(struct lttng_consumer_stream *stream) | |
846 | { | |
847 | struct consumer_relayd_sock_pair *relayd; | |
848 | ||
849 | /* The stream is not metadata. Get relayd reference if exists. */ | |
850 | rcu_read_lock(); | |
851 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
852 | if (relayd) { | |
853 | consumer_stream_relayd_close(stream, relayd); | |
854 | } | |
855 | rcu_read_unlock(); | |
856 | } | |
857 | ||
00e2e675 DG |
858 | /* |
859 | * Handle stream for relayd transmission if the stream applies for network | |
860 | * streaming where the net sequence index is set. | |
861 | * | |
862 | * Return destination file descriptor or negative value on error. | |
863 | */ | |
6197aea7 | 864 | static int write_relayd_stream_header(struct lttng_consumer_stream *stream, |
1d4dfdef DG |
865 | size_t data_size, unsigned long padding, |
866 | struct consumer_relayd_sock_pair *relayd) | |
00e2e675 DG |
867 | { |
868 | int outfd = -1, ret; | |
00e2e675 DG |
869 | struct lttcomm_relayd_data_hdr data_hdr; |
870 | ||
871 | /* Safety net */ | |
872 | assert(stream); | |
6197aea7 | 873 | assert(relayd); |
00e2e675 DG |
874 | |
875 | /* Reset data header */ | |
876 | memset(&data_hdr, 0, sizeof(data_hdr)); | |
877 | ||
00e2e675 DG |
878 | if (stream->metadata_flag) { |
879 | /* Caller MUST acquire the relayd control socket lock */ | |
880 | ret = relayd_send_metadata(&relayd->control_sock, data_size); | |
881 | if (ret < 0) { | |
882 | goto error; | |
883 | } | |
884 | ||
885 | /* Metadata are always sent on the control socket. */ | |
6151a90f | 886 | outfd = relayd->control_sock.sock.fd; |
00e2e675 DG |
887 | } else { |
888 | /* Set header with stream information */ | |
889 | data_hdr.stream_id = htobe64(stream->relayd_stream_id); | |
890 | data_hdr.data_size = htobe32(data_size); | |
1d4dfdef | 891 | data_hdr.padding_size = htobe32(padding); |
39df6d9f DG |
892 | /* |
893 | * Note that net_seq_num below is assigned with the *current* value of | |
894 | * next_net_seq_num and only after that the next_net_seq_num will be | |
895 | * increment. This is why when issuing a command on the relayd using | |
896 | * this next value, 1 should always be substracted in order to compare | |
897 | * the last seen sequence number on the relayd side to the last sent. | |
898 | */ | |
3604f373 | 899 | data_hdr.net_seq_num = htobe64(stream->next_net_seq_num); |
00e2e675 DG |
900 | /* Other fields are zeroed previously */ |
901 | ||
902 | ret = relayd_send_data_hdr(&relayd->data_sock, &data_hdr, | |
903 | sizeof(data_hdr)); | |
904 | if (ret < 0) { | |
905 | goto error; | |
906 | } | |
907 | ||
3604f373 DG |
908 | ++stream->next_net_seq_num; |
909 | ||
00e2e675 | 910 | /* Set to go on data socket */ |
6151a90f | 911 | outfd = relayd->data_sock.sock.fd; |
00e2e675 DG |
912 | } |
913 | ||
914 | error: | |
915 | return outfd; | |
916 | } | |
917 | ||
3bd1e081 | 918 | /* |
ffe60014 DG |
919 | * Allocate and return a new lttng_consumer_channel object using the given key |
920 | * to initialize the hash table node. | |
921 | * | |
922 | * On error, return NULL. | |
3bd1e081 | 923 | */ |
886224ff | 924 | struct lttng_consumer_channel *consumer_allocate_channel(uint64_t key, |
ffe60014 DG |
925 | uint64_t session_id, |
926 | const char *pathname, | |
927 | const char *name, | |
928 | uid_t uid, | |
929 | gid_t gid, | |
57a269f2 | 930 | uint64_t relayd_id, |
1624d5b7 JD |
931 | enum lttng_event_output output, |
932 | uint64_t tracefile_size, | |
2bba9e53 | 933 | uint64_t tracefile_count, |
1950109e | 934 | uint64_t session_id_per_pid, |
ecc48a90 JD |
935 | unsigned int monitor, |
936 | unsigned int live_timer_interval) | |
3bd1e081 MD |
937 | { |
938 | struct lttng_consumer_channel *channel; | |
3bd1e081 | 939 | |
276b26d1 | 940 | channel = zmalloc(sizeof(*channel)); |
3bd1e081 | 941 | if (channel == NULL) { |
7a57cf92 | 942 | PERROR("malloc struct lttng_consumer_channel"); |
3bd1e081 MD |
943 | goto end; |
944 | } | |
ffe60014 DG |
945 | |
946 | channel->key = key; | |
3bd1e081 | 947 | channel->refcount = 0; |
ffe60014 | 948 | channel->session_id = session_id; |
1950109e | 949 | channel->session_id_per_pid = session_id_per_pid; |
ffe60014 DG |
950 | channel->uid = uid; |
951 | channel->gid = gid; | |
952 | channel->relayd_id = relayd_id; | |
1624d5b7 JD |
953 | channel->tracefile_size = tracefile_size; |
954 | channel->tracefile_count = tracefile_count; | |
2bba9e53 | 955 | channel->monitor = monitor; |
ecc48a90 | 956 | channel->live_timer_interval = live_timer_interval; |
a9838785 | 957 | pthread_mutex_init(&channel->lock, NULL); |
ec6ea7d0 | 958 | pthread_mutex_init(&channel->timer_lock, NULL); |
ffe60014 | 959 | |
0c759fc9 DG |
960 | switch (output) { |
961 | case LTTNG_EVENT_SPLICE: | |
962 | channel->output = CONSUMER_CHANNEL_SPLICE; | |
963 | break; | |
964 | case LTTNG_EVENT_MMAP: | |
965 | channel->output = CONSUMER_CHANNEL_MMAP; | |
966 | break; | |
967 | default: | |
968 | assert(0); | |
969 | free(channel); | |
970 | channel = NULL; | |
971 | goto end; | |
972 | } | |
973 | ||
07b86b52 JD |
974 | /* |
975 | * In monitor mode, the streams associated with the channel will be put in | |
976 | * a special list ONLY owned by this channel. So, the refcount is set to 1 | |
977 | * here meaning that the channel itself has streams that are referenced. | |
978 | * | |
979 | * On a channel deletion, once the channel is no longer visible, the | |
980 | * refcount is decremented and checked for a zero value to delete it. With | |
981 | * streams in no monitor mode, it will now be safe to destroy the channel. | |
982 | */ | |
983 | if (!channel->monitor) { | |
984 | channel->refcount = 1; | |
985 | } | |
986 | ||
ffe60014 DG |
987 | strncpy(channel->pathname, pathname, sizeof(channel->pathname)); |
988 | channel->pathname[sizeof(channel->pathname) - 1] = '\0'; | |
989 | ||
990 | strncpy(channel->name, name, sizeof(channel->name)); | |
991 | channel->name[sizeof(channel->name) - 1] = '\0'; | |
992 | ||
d88aee68 | 993 | lttng_ht_node_init_u64(&channel->node, channel->key); |
d8ef542d MD |
994 | |
995 | channel->wait_fd = -1; | |
996 | ||
ffe60014 DG |
997 | CDS_INIT_LIST_HEAD(&channel->streams.head); |
998 | ||
d88aee68 | 999 | DBG("Allocated channel (key %" PRIu64 ")", channel->key) |
3bd1e081 | 1000 | |
3bd1e081 MD |
1001 | end: |
1002 | return channel; | |
1003 | } | |
1004 | ||
1005 | /* | |
1006 | * Add a channel to the global list protected by a mutex. | |
821fffb2 | 1007 | * |
b5a6470f | 1008 | * Always return 0 indicating success. |
3bd1e081 | 1009 | */ |
d8ef542d MD |
1010 | int consumer_add_channel(struct lttng_consumer_channel *channel, |
1011 | struct lttng_consumer_local_data *ctx) | |
3bd1e081 | 1012 | { |
3bd1e081 | 1013 | pthread_mutex_lock(&consumer_data.lock); |
a9838785 | 1014 | pthread_mutex_lock(&channel->lock); |
ec6ea7d0 | 1015 | pthread_mutex_lock(&channel->timer_lock); |
c77fc10a | 1016 | |
b5a6470f DG |
1017 | /* |
1018 | * This gives us a guarantee that the channel we are about to add to the | |
1019 | * channel hash table will be unique. See this function comment on the why | |
1020 | * we need to steel the channel key at this stage. | |
1021 | */ | |
1022 | steal_channel_key(channel->key); | |
c77fc10a | 1023 | |
b5a6470f | 1024 | rcu_read_lock(); |
d88aee68 | 1025 | lttng_ht_add_unique_u64(consumer_data.channel_ht, &channel->node); |
6065ceec | 1026 | rcu_read_unlock(); |
b5a6470f | 1027 | |
ec6ea7d0 | 1028 | pthread_mutex_unlock(&channel->timer_lock); |
a9838785 | 1029 | pthread_mutex_unlock(&channel->lock); |
3bd1e081 | 1030 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 1031 | |
b5a6470f | 1032 | if (channel->wait_fd != -1 && channel->type == CONSUMER_CHANNEL_TYPE_DATA) { |
a0cbdd2e | 1033 | notify_channel_pipe(ctx, channel, -1, CONSUMER_CHANNEL_ADD); |
d8ef542d | 1034 | } |
b5a6470f DG |
1035 | |
1036 | return 0; | |
3bd1e081 MD |
1037 | } |
1038 | ||
1039 | /* | |
1040 | * Allocate the pollfd structure and the local view of the out fds to avoid | |
1041 | * doing a lookup in the linked list and concurrency issues when writing is | |
1042 | * needed. Called with consumer_data.lock held. | |
1043 | * | |
1044 | * Returns the number of fds in the structures. | |
1045 | */ | |
ffe60014 DG |
1046 | static int update_poll_array(struct lttng_consumer_local_data *ctx, |
1047 | struct pollfd **pollfd, struct lttng_consumer_stream **local_stream, | |
1048 | struct lttng_ht *ht) | |
3bd1e081 | 1049 | { |
3bd1e081 | 1050 | int i = 0; |
e4421fec DG |
1051 | struct lttng_ht_iter iter; |
1052 | struct lttng_consumer_stream *stream; | |
3bd1e081 | 1053 | |
ffe60014 DG |
1054 | assert(ctx); |
1055 | assert(ht); | |
1056 | assert(pollfd); | |
1057 | assert(local_stream); | |
1058 | ||
3bd1e081 | 1059 | DBG("Updating poll fd array"); |
481d6c57 | 1060 | rcu_read_lock(); |
43c34bc3 | 1061 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { |
8994307f DG |
1062 | /* |
1063 | * Only active streams with an active end point can be added to the | |
1064 | * poll set and local stream storage of the thread. | |
1065 | * | |
1066 | * There is a potential race here for endpoint_status to be updated | |
1067 | * just after the check. However, this is OK since the stream(s) will | |
1068 | * be deleted once the thread is notified that the end point state has | |
1069 | * changed where this function will be called back again. | |
1070 | */ | |
1071 | if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM || | |
79d4ffb7 | 1072 | stream->endpoint_status == CONSUMER_ENDPOINT_INACTIVE) { |
3bd1e081 MD |
1073 | continue; |
1074 | } | |
7972aab2 DG |
1075 | /* |
1076 | * This clobbers way too much the debug output. Uncomment that if you | |
1077 | * need it for debugging purposes. | |
1078 | * | |
1079 | * DBG("Active FD %d", stream->wait_fd); | |
1080 | */ | |
e4421fec | 1081 | (*pollfd)[i].fd = stream->wait_fd; |
3bd1e081 | 1082 | (*pollfd)[i].events = POLLIN | POLLPRI; |
e4421fec | 1083 | local_stream[i] = stream; |
3bd1e081 MD |
1084 | i++; |
1085 | } | |
481d6c57 | 1086 | rcu_read_unlock(); |
3bd1e081 MD |
1087 | |
1088 | /* | |
50f8ae69 | 1089 | * Insert the consumer_data_pipe at the end of the array and don't |
3bd1e081 MD |
1090 | * increment i so nb_fd is the number of real FD. |
1091 | */ | |
acdb9057 | 1092 | (*pollfd)[i].fd = lttng_pipe_get_readfd(ctx->consumer_data_pipe); |
509bb1cf | 1093 | (*pollfd)[i].events = POLLIN | POLLPRI; |
3bd1e081 MD |
1094 | return i; |
1095 | } | |
1096 | ||
1097 | /* | |
1098 | * Poll on the should_quit pipe and the command socket return -1 on error and | |
1099 | * should exit, 0 if data is available on the command socket | |
1100 | */ | |
1101 | int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll) | |
1102 | { | |
1103 | int num_rdy; | |
1104 | ||
88f2b785 | 1105 | restart: |
3bd1e081 MD |
1106 | num_rdy = poll(consumer_sockpoll, 2, -1); |
1107 | if (num_rdy == -1) { | |
88f2b785 MD |
1108 | /* |
1109 | * Restart interrupted system call. | |
1110 | */ | |
1111 | if (errno == EINTR) { | |
1112 | goto restart; | |
1113 | } | |
7a57cf92 | 1114 | PERROR("Poll error"); |
3bd1e081 MD |
1115 | goto exit; |
1116 | } | |
509bb1cf | 1117 | if (consumer_sockpoll[0].revents & (POLLIN | POLLPRI)) { |
3bd1e081 MD |
1118 | DBG("consumer_should_quit wake up"); |
1119 | goto exit; | |
1120 | } | |
1121 | return 0; | |
1122 | ||
1123 | exit: | |
1124 | return -1; | |
1125 | } | |
1126 | ||
1127 | /* | |
1128 | * Set the error socket. | |
1129 | */ | |
ffe60014 DG |
1130 | void lttng_consumer_set_error_sock(struct lttng_consumer_local_data *ctx, |
1131 | int sock) | |
3bd1e081 MD |
1132 | { |
1133 | ctx->consumer_error_socket = sock; | |
1134 | } | |
1135 | ||
1136 | /* | |
1137 | * Set the command socket path. | |
1138 | */ | |
3bd1e081 MD |
1139 | void lttng_consumer_set_command_sock_path( |
1140 | struct lttng_consumer_local_data *ctx, char *sock) | |
1141 | { | |
1142 | ctx->consumer_command_sock_path = sock; | |
1143 | } | |
1144 | ||
1145 | /* | |
1146 | * Send return code to the session daemon. | |
1147 | * If the socket is not defined, we return 0, it is not a fatal error | |
1148 | */ | |
ffe60014 | 1149 | int lttng_consumer_send_error(struct lttng_consumer_local_data *ctx, int cmd) |
3bd1e081 MD |
1150 | { |
1151 | if (ctx->consumer_error_socket > 0) { | |
1152 | return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd, | |
1153 | sizeof(enum lttcomm_sessiond_command)); | |
1154 | } | |
1155 | ||
1156 | return 0; | |
1157 | } | |
1158 | ||
1159 | /* | |
228b5bf7 DG |
1160 | * Close all the tracefiles and stream fds and MUST be called when all |
1161 | * instances are destroyed i.e. when all threads were joined and are ended. | |
3bd1e081 MD |
1162 | */ |
1163 | void lttng_consumer_cleanup(void) | |
1164 | { | |
e4421fec | 1165 | struct lttng_ht_iter iter; |
ffe60014 | 1166 | struct lttng_consumer_channel *channel; |
6065ceec DG |
1167 | |
1168 | rcu_read_lock(); | |
3bd1e081 | 1169 | |
ffe60014 DG |
1170 | cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, channel, |
1171 | node.node) { | |
702b1ea4 | 1172 | consumer_del_channel(channel); |
3bd1e081 | 1173 | } |
6065ceec DG |
1174 | |
1175 | rcu_read_unlock(); | |
d6ce1df2 | 1176 | |
d6ce1df2 | 1177 | lttng_ht_destroy(consumer_data.channel_ht); |
228b5bf7 DG |
1178 | |
1179 | cleanup_relayd_ht(); | |
1180 | ||
d8ef542d MD |
1181 | lttng_ht_destroy(consumer_data.stream_per_chan_id_ht); |
1182 | ||
228b5bf7 DG |
1183 | /* |
1184 | * This HT contains streams that are freed by either the metadata thread or | |
1185 | * the data thread so we do *nothing* on the hash table and simply destroy | |
1186 | * it. | |
1187 | */ | |
1188 | lttng_ht_destroy(consumer_data.stream_list_ht); | |
3bd1e081 MD |
1189 | } |
1190 | ||
1191 | /* | |
1192 | * Called from signal handler. | |
1193 | */ | |
1194 | void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx) | |
1195 | { | |
6cd525e8 MD |
1196 | ssize_t ret; |
1197 | ||
3bd1e081 | 1198 | consumer_quit = 1; |
6cd525e8 MD |
1199 | ret = lttng_write(ctx->consumer_should_quit[1], "4", 1); |
1200 | if (ret < 1) { | |
7a57cf92 | 1201 | PERROR("write consumer quit"); |
3bd1e081 | 1202 | } |
ab1027f4 DG |
1203 | |
1204 | DBG("Consumer flag that it should quit"); | |
3bd1e081 MD |
1205 | } |
1206 | ||
00e2e675 DG |
1207 | void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream, |
1208 | off_t orig_offset) | |
3bd1e081 MD |
1209 | { |
1210 | int outfd = stream->out_fd; | |
1211 | ||
1212 | /* | |
1213 | * This does a blocking write-and-wait on any page that belongs to the | |
1214 | * subbuffer prior to the one we just wrote. | |
1215 | * Don't care about error values, as these are just hints and ways to | |
1216 | * limit the amount of page cache used. | |
1217 | */ | |
ffe60014 | 1218 | if (orig_offset < stream->max_sb_size) { |
3bd1e081 MD |
1219 | return; |
1220 | } | |
ffe60014 DG |
1221 | lttng_sync_file_range(outfd, orig_offset - stream->max_sb_size, |
1222 | stream->max_sb_size, | |
3bd1e081 MD |
1223 | SYNC_FILE_RANGE_WAIT_BEFORE |
1224 | | SYNC_FILE_RANGE_WRITE | |
1225 | | SYNC_FILE_RANGE_WAIT_AFTER); | |
1226 | /* | |
1227 | * Give hints to the kernel about how we access the file: | |
1228 | * POSIX_FADV_DONTNEED : we won't re-access data in a near future after | |
1229 | * we write it. | |
1230 | * | |
1231 | * We need to call fadvise again after the file grows because the | |
1232 | * kernel does not seem to apply fadvise to non-existing parts of the | |
1233 | * file. | |
1234 | * | |
1235 | * Call fadvise _after_ having waited for the page writeback to | |
1236 | * complete because the dirty page writeback semantic is not well | |
1237 | * defined. So it can be expected to lead to lower throughput in | |
1238 | * streaming. | |
1239 | */ | |
ffe60014 DG |
1240 | posix_fadvise(outfd, orig_offset - stream->max_sb_size, |
1241 | stream->max_sb_size, POSIX_FADV_DONTNEED); | |
3bd1e081 MD |
1242 | } |
1243 | ||
1244 | /* | |
1245 | * Initialise the necessary environnement : | |
1246 | * - create a new context | |
1247 | * - create the poll_pipe | |
1248 | * - create the should_quit pipe (for signal handler) | |
1249 | * - create the thread pipe (for splice) | |
1250 | * | |
1251 | * Takes a function pointer as argument, this function is called when data is | |
1252 | * available on a buffer. This function is responsible to do the | |
1253 | * kernctl_get_next_subbuf, read the data with mmap or splice depending on the | |
1254 | * buffer configuration and then kernctl_put_next_subbuf at the end. | |
1255 | * | |
1256 | * Returns a pointer to the new context or NULL on error. | |
1257 | */ | |
1258 | struct lttng_consumer_local_data *lttng_consumer_create( | |
1259 | enum lttng_consumer_type type, | |
4078b776 | 1260 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
d41f73b7 | 1261 | struct lttng_consumer_local_data *ctx), |
3bd1e081 MD |
1262 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
1263 | int (*recv_stream)(struct lttng_consumer_stream *stream), | |
30319bcb | 1264 | int (*update_stream)(uint64_t stream_key, uint32_t state)) |
3bd1e081 | 1265 | { |
d8ef542d | 1266 | int ret; |
3bd1e081 MD |
1267 | struct lttng_consumer_local_data *ctx; |
1268 | ||
1269 | assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN || | |
1270 | consumer_data.type == type); | |
1271 | consumer_data.type = type; | |
1272 | ||
effcf122 | 1273 | ctx = zmalloc(sizeof(struct lttng_consumer_local_data)); |
3bd1e081 | 1274 | if (ctx == NULL) { |
7a57cf92 | 1275 | PERROR("allocating context"); |
3bd1e081 MD |
1276 | goto error; |
1277 | } | |
1278 | ||
1279 | ctx->consumer_error_socket = -1; | |
331744e3 | 1280 | ctx->consumer_metadata_socket = -1; |
75d83e50 | 1281 | pthread_mutex_init(&ctx->metadata_socket_lock, NULL); |
3bd1e081 MD |
1282 | /* assign the callbacks */ |
1283 | ctx->on_buffer_ready = buffer_ready; | |
1284 | ctx->on_recv_channel = recv_channel; | |
1285 | ctx->on_recv_stream = recv_stream; | |
1286 | ctx->on_update_stream = update_stream; | |
1287 | ||
acdb9057 DG |
1288 | ctx->consumer_data_pipe = lttng_pipe_open(0); |
1289 | if (!ctx->consumer_data_pipe) { | |
3bd1e081 MD |
1290 | goto error_poll_pipe; |
1291 | } | |
1292 | ||
1293 | ret = pipe(ctx->consumer_should_quit); | |
1294 | if (ret < 0) { | |
7a57cf92 | 1295 | PERROR("Error creating recv pipe"); |
3bd1e081 MD |
1296 | goto error_quit_pipe; |
1297 | } | |
1298 | ||
1299 | ret = pipe(ctx->consumer_thread_pipe); | |
1300 | if (ret < 0) { | |
7a57cf92 | 1301 | PERROR("Error creating thread pipe"); |
3bd1e081 MD |
1302 | goto error_thread_pipe; |
1303 | } | |
1304 | ||
d8ef542d MD |
1305 | ret = pipe(ctx->consumer_channel_pipe); |
1306 | if (ret < 0) { | |
1307 | PERROR("Error creating channel pipe"); | |
1308 | goto error_channel_pipe; | |
1309 | } | |
1310 | ||
13886d2d DG |
1311 | ctx->consumer_metadata_pipe = lttng_pipe_open(0); |
1312 | if (!ctx->consumer_metadata_pipe) { | |
fb3a43a9 DG |
1313 | goto error_metadata_pipe; |
1314 | } | |
3bd1e081 | 1315 | |
fb3a43a9 DG |
1316 | ret = utils_create_pipe(ctx->consumer_splice_metadata_pipe); |
1317 | if (ret < 0) { | |
1318 | goto error_splice_pipe; | |
1319 | } | |
1320 | ||
1321 | return ctx; | |
3bd1e081 | 1322 | |
fb3a43a9 | 1323 | error_splice_pipe: |
13886d2d | 1324 | lttng_pipe_destroy(ctx->consumer_metadata_pipe); |
fb3a43a9 | 1325 | error_metadata_pipe: |
d8ef542d MD |
1326 | utils_close_pipe(ctx->consumer_channel_pipe); |
1327 | error_channel_pipe: | |
fb3a43a9 | 1328 | utils_close_pipe(ctx->consumer_thread_pipe); |
3bd1e081 | 1329 | error_thread_pipe: |
d8ef542d | 1330 | utils_close_pipe(ctx->consumer_should_quit); |
3bd1e081 | 1331 | error_quit_pipe: |
acdb9057 | 1332 | lttng_pipe_destroy(ctx->consumer_data_pipe); |
3bd1e081 MD |
1333 | error_poll_pipe: |
1334 | free(ctx); | |
1335 | error: | |
1336 | return NULL; | |
1337 | } | |
1338 | ||
282dadbc MD |
1339 | /* |
1340 | * Iterate over all streams of the hashtable and free them properly. | |
1341 | */ | |
1342 | static void destroy_data_stream_ht(struct lttng_ht *ht) | |
1343 | { | |
1344 | struct lttng_ht_iter iter; | |
1345 | struct lttng_consumer_stream *stream; | |
1346 | ||
1347 | if (ht == NULL) { | |
1348 | return; | |
1349 | } | |
1350 | ||
1351 | rcu_read_lock(); | |
1352 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { | |
1353 | /* | |
1354 | * Ignore return value since we are currently cleaning up so any error | |
1355 | * can't be handled. | |
1356 | */ | |
1357 | (void) consumer_del_stream(stream, ht); | |
1358 | } | |
1359 | rcu_read_unlock(); | |
1360 | ||
1361 | lttng_ht_destroy(ht); | |
1362 | } | |
1363 | ||
1364 | /* | |
1365 | * Iterate over all streams of the metadata hashtable and free them | |
1366 | * properly. | |
1367 | */ | |
1368 | static void destroy_metadata_stream_ht(struct lttng_ht *ht) | |
1369 | { | |
1370 | struct lttng_ht_iter iter; | |
1371 | struct lttng_consumer_stream *stream; | |
1372 | ||
1373 | if (ht == NULL) { | |
1374 | return; | |
1375 | } | |
1376 | ||
1377 | rcu_read_lock(); | |
1378 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { | |
1379 | /* | |
1380 | * Ignore return value since we are currently cleaning up so any error | |
1381 | * can't be handled. | |
1382 | */ | |
1383 | (void) consumer_del_metadata_stream(stream, ht); | |
1384 | } | |
1385 | rcu_read_unlock(); | |
1386 | ||
1387 | lttng_ht_destroy(ht); | |
1388 | } | |
1389 | ||
3bd1e081 MD |
1390 | /* |
1391 | * Close all fds associated with the instance and free the context. | |
1392 | */ | |
1393 | void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx) | |
1394 | { | |
4c462e79 MD |
1395 | int ret; |
1396 | ||
ab1027f4 DG |
1397 | DBG("Consumer destroying it. Closing everything."); |
1398 | ||
282dadbc MD |
1399 | destroy_data_stream_ht(data_ht); |
1400 | destroy_metadata_stream_ht(metadata_ht); | |
1401 | ||
4c462e79 MD |
1402 | ret = close(ctx->consumer_error_socket); |
1403 | if (ret) { | |
1404 | PERROR("close"); | |
1405 | } | |
331744e3 JD |
1406 | ret = close(ctx->consumer_metadata_socket); |
1407 | if (ret) { | |
1408 | PERROR("close"); | |
1409 | } | |
d8ef542d MD |
1410 | utils_close_pipe(ctx->consumer_thread_pipe); |
1411 | utils_close_pipe(ctx->consumer_channel_pipe); | |
acdb9057 | 1412 | lttng_pipe_destroy(ctx->consumer_data_pipe); |
13886d2d | 1413 | lttng_pipe_destroy(ctx->consumer_metadata_pipe); |
d8ef542d | 1414 | utils_close_pipe(ctx->consumer_should_quit); |
fb3a43a9 DG |
1415 | utils_close_pipe(ctx->consumer_splice_metadata_pipe); |
1416 | ||
3bd1e081 MD |
1417 | unlink(ctx->consumer_command_sock_path); |
1418 | free(ctx); | |
1419 | } | |
1420 | ||
6197aea7 DG |
1421 | /* |
1422 | * Write the metadata stream id on the specified file descriptor. | |
1423 | */ | |
1424 | static int write_relayd_metadata_id(int fd, | |
1425 | struct lttng_consumer_stream *stream, | |
ffe60014 | 1426 | struct consumer_relayd_sock_pair *relayd, unsigned long padding) |
6197aea7 | 1427 | { |
6cd525e8 | 1428 | ssize_t ret; |
1d4dfdef | 1429 | struct lttcomm_relayd_metadata_payload hdr; |
6197aea7 | 1430 | |
1d4dfdef DG |
1431 | hdr.stream_id = htobe64(stream->relayd_stream_id); |
1432 | hdr.padding_size = htobe32(padding); | |
6cd525e8 MD |
1433 | ret = lttng_write(fd, (void *) &hdr, sizeof(hdr)); |
1434 | if (ret < sizeof(hdr)) { | |
d7b75ec8 DG |
1435 | /* |
1436 | * This error means that the fd's end is closed so ignore the perror | |
1437 | * not to clubber the error output since this can happen in a normal | |
1438 | * code path. | |
1439 | */ | |
1440 | if (errno != EPIPE) { | |
1441 | PERROR("write metadata stream id"); | |
1442 | } | |
1443 | DBG3("Consumer failed to write relayd metadata id (errno: %d)", errno); | |
534d2592 DG |
1444 | /* |
1445 | * Set ret to a negative value because if ret != sizeof(hdr), we don't | |
1446 | * handle writting the missing part so report that as an error and | |
1447 | * don't lie to the caller. | |
1448 | */ | |
1449 | ret = -1; | |
6197aea7 DG |
1450 | goto end; |
1451 | } | |
1d4dfdef DG |
1452 | DBG("Metadata stream id %" PRIu64 " with padding %lu written before data", |
1453 | stream->relayd_stream_id, padding); | |
6197aea7 DG |
1454 | |
1455 | end: | |
6cd525e8 | 1456 | return (int) ret; |
6197aea7 DG |
1457 | } |
1458 | ||
3bd1e081 | 1459 | /* |
09e26845 DG |
1460 | * Mmap the ring buffer, read it and write the data to the tracefile. This is a |
1461 | * core function for writing trace buffers to either the local filesystem or | |
1462 | * the network. | |
1463 | * | |
79d4ffb7 DG |
1464 | * It must be called with the stream lock held. |
1465 | * | |
09e26845 | 1466 | * Careful review MUST be put if any changes occur! |
3bd1e081 MD |
1467 | * |
1468 | * Returns the number of bytes written | |
1469 | */ | |
4078b776 | 1470 | ssize_t lttng_consumer_on_read_subbuffer_mmap( |
3bd1e081 | 1471 | struct lttng_consumer_local_data *ctx, |
1d4dfdef | 1472 | struct lttng_consumer_stream *stream, unsigned long len, |
309167d2 | 1473 | unsigned long padding, |
50adc264 | 1474 | struct ctf_packet_index *index) |
3bd1e081 | 1475 | { |
f02e1e8a | 1476 | unsigned long mmap_offset; |
ffe60014 | 1477 | void *mmap_base; |
994ab360 | 1478 | ssize_t ret = 0; |
f02e1e8a DG |
1479 | off_t orig_offset = stream->out_fd_offset; |
1480 | /* Default is on the disk */ | |
1481 | int outfd = stream->out_fd; | |
f02e1e8a | 1482 | struct consumer_relayd_sock_pair *relayd = NULL; |
8994307f | 1483 | unsigned int relayd_hang_up = 0; |
f02e1e8a DG |
1484 | |
1485 | /* RCU lock for the relayd pointer */ | |
1486 | rcu_read_lock(); | |
1487 | ||
1488 | /* Flag that the current stream if set for network streaming. */ | |
da009f2c | 1489 | if (stream->net_seq_idx != (uint64_t) -1ULL) { |
f02e1e8a DG |
1490 | relayd = consumer_find_relayd(stream->net_seq_idx); |
1491 | if (relayd == NULL) { | |
56591bac | 1492 | ret = -EPIPE; |
f02e1e8a DG |
1493 | goto end; |
1494 | } | |
1495 | } | |
1496 | ||
1497 | /* get the offset inside the fd to mmap */ | |
3bd1e081 MD |
1498 | switch (consumer_data.type) { |
1499 | case LTTNG_CONSUMER_KERNEL: | |
ffe60014 | 1500 | mmap_base = stream->mmap_base; |
f02e1e8a | 1501 | ret = kernctl_get_mmap_read_offset(stream->wait_fd, &mmap_offset); |
994ab360 DG |
1502 | if (ret < 0) { |
1503 | ret = -errno; | |
56591bac | 1504 | PERROR("tracer ctl get_mmap_read_offset"); |
56591bac MD |
1505 | goto end; |
1506 | } | |
f02e1e8a | 1507 | break; |
7753dea8 MD |
1508 | case LTTNG_CONSUMER32_UST: |
1509 | case LTTNG_CONSUMER64_UST: | |
ffe60014 DG |
1510 | mmap_base = lttng_ustctl_get_mmap_base(stream); |
1511 | if (!mmap_base) { | |
1512 | ERR("read mmap get mmap base for stream %s", stream->name); | |
994ab360 | 1513 | ret = -EPERM; |
ffe60014 DG |
1514 | goto end; |
1515 | } | |
1516 | ret = lttng_ustctl_get_mmap_read_offset(stream, &mmap_offset); | |
56591bac MD |
1517 | if (ret != 0) { |
1518 | PERROR("tracer ctl get_mmap_read_offset"); | |
994ab360 | 1519 | ret = -EINVAL; |
56591bac MD |
1520 | goto end; |
1521 | } | |
f02e1e8a | 1522 | break; |
3bd1e081 MD |
1523 | default: |
1524 | ERR("Unknown consumer_data type"); | |
1525 | assert(0); | |
1526 | } | |
b9182dd9 | 1527 | |
f02e1e8a DG |
1528 | /* Handle stream on the relayd if the output is on the network */ |
1529 | if (relayd) { | |
1530 | unsigned long netlen = len; | |
1531 | ||
1532 | /* | |
1533 | * Lock the control socket for the complete duration of the function | |
1534 | * since from this point on we will use the socket. | |
1535 | */ | |
1536 | if (stream->metadata_flag) { | |
1537 | /* Metadata requires the control socket. */ | |
1538 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1d4dfdef | 1539 | netlen += sizeof(struct lttcomm_relayd_metadata_payload); |
f02e1e8a DG |
1540 | } |
1541 | ||
1d4dfdef | 1542 | ret = write_relayd_stream_header(stream, netlen, padding, relayd); |
994ab360 DG |
1543 | if (ret < 0) { |
1544 | relayd_hang_up = 1; | |
1545 | goto write_error; | |
1546 | } | |
1547 | /* Use the returned socket. */ | |
1548 | outfd = ret; | |
f02e1e8a | 1549 | |
994ab360 DG |
1550 | /* Write metadata stream id before payload */ |
1551 | if (stream->metadata_flag) { | |
1552 | ret = write_relayd_metadata_id(outfd, stream, relayd, padding); | |
1553 | if (ret < 0) { | |
8994307f DG |
1554 | relayd_hang_up = 1; |
1555 | goto write_error; | |
1556 | } | |
f02e1e8a | 1557 | } |
1d4dfdef DG |
1558 | } else { |
1559 | /* No streaming, we have to set the len with the full padding */ | |
1560 | len += padding; | |
1624d5b7 JD |
1561 | |
1562 | /* | |
1563 | * Check if we need to change the tracefile before writing the packet. | |
1564 | */ | |
1565 | if (stream->chan->tracefile_size > 0 && | |
1566 | (stream->tracefile_size_current + len) > | |
1567 | stream->chan->tracefile_size) { | |
fe4477ee JD |
1568 | ret = utils_rotate_stream_file(stream->chan->pathname, |
1569 | stream->name, stream->chan->tracefile_size, | |
1570 | stream->chan->tracefile_count, stream->uid, stream->gid, | |
309167d2 JD |
1571 | stream->out_fd, &(stream->tracefile_count_current), |
1572 | &stream->out_fd); | |
1624d5b7 JD |
1573 | if (ret < 0) { |
1574 | ERR("Rotating output file"); | |
1575 | goto end; | |
1576 | } | |
309167d2 JD |
1577 | outfd = stream->out_fd; |
1578 | ||
1579 | if (stream->index_fd >= 0) { | |
1580 | ret = index_create_file(stream->chan->pathname, | |
1581 | stream->name, stream->uid, stream->gid, | |
1582 | stream->chan->tracefile_size, | |
1583 | stream->tracefile_count_current); | |
1584 | if (ret < 0) { | |
1585 | goto end; | |
1586 | } | |
1587 | stream->index_fd = ret; | |
1588 | } | |
1589 | ||
a6976990 DG |
1590 | /* Reset current size because we just perform a rotation. */ |
1591 | stream->tracefile_size_current = 0; | |
a1ae300f JD |
1592 | stream->out_fd_offset = 0; |
1593 | orig_offset = 0; | |
1624d5b7 JD |
1594 | } |
1595 | stream->tracefile_size_current += len; | |
309167d2 JD |
1596 | if (index) { |
1597 | index->offset = htobe64(stream->out_fd_offset); | |
1598 | } | |
f02e1e8a DG |
1599 | } |
1600 | ||
d02b8372 DG |
1601 | /* |
1602 | * This call guarantee that len or less is returned. It's impossible to | |
1603 | * receive a ret value that is bigger than len. | |
1604 | */ | |
1605 | ret = lttng_write(outfd, mmap_base + mmap_offset, len); | |
1606 | DBG("Consumer mmap write() ret %zd (len %lu)", ret, len); | |
1607 | if (ret < 0 || ((size_t) ret != len)) { | |
1608 | /* | |
1609 | * Report error to caller if nothing was written else at least send the | |
1610 | * amount written. | |
1611 | */ | |
1612 | if (ret < 0) { | |
994ab360 | 1613 | ret = -errno; |
f02e1e8a | 1614 | } |
994ab360 | 1615 | relayd_hang_up = 1; |
f02e1e8a | 1616 | |
d02b8372 | 1617 | /* Socket operation failed. We consider the relayd dead */ |
994ab360 | 1618 | if (errno == EPIPE || errno == EINVAL || errno == EBADF) { |
d02b8372 DG |
1619 | /* |
1620 | * This is possible if the fd is closed on the other side | |
1621 | * (outfd) or any write problem. It can be verbose a bit for a | |
1622 | * normal execution if for instance the relayd is stopped | |
1623 | * abruptly. This can happen so set this to a DBG statement. | |
1624 | */ | |
1625 | DBG("Consumer mmap write detected relayd hang up"); | |
994ab360 DG |
1626 | } else { |
1627 | /* Unhandled error, print it and stop function right now. */ | |
1628 | PERROR("Error in write mmap (ret %zd != len %lu)", ret, len); | |
f02e1e8a | 1629 | } |
994ab360 | 1630 | goto write_error; |
d02b8372 DG |
1631 | } |
1632 | stream->output_written += ret; | |
d02b8372 DG |
1633 | |
1634 | /* This call is useless on a socket so better save a syscall. */ | |
1635 | if (!relayd) { | |
1636 | /* This won't block, but will start writeout asynchronously */ | |
1637 | lttng_sync_file_range(outfd, stream->out_fd_offset, len, | |
1638 | SYNC_FILE_RANGE_WRITE); | |
1639 | stream->out_fd_offset += len; | |
f02e1e8a DG |
1640 | } |
1641 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
1642 | ||
8994307f DG |
1643 | write_error: |
1644 | /* | |
1645 | * This is a special case that the relayd has closed its socket. Let's | |
1646 | * cleanup the relayd object and all associated streams. | |
1647 | */ | |
1648 | if (relayd && relayd_hang_up) { | |
1649 | cleanup_relayd(relayd, ctx); | |
1650 | } | |
1651 | ||
f02e1e8a DG |
1652 | end: |
1653 | /* Unlock only if ctrl socket used */ | |
1654 | if (relayd && stream->metadata_flag) { | |
1655 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1656 | } | |
1657 | ||
1658 | rcu_read_unlock(); | |
994ab360 | 1659 | return ret; |
3bd1e081 MD |
1660 | } |
1661 | ||
1662 | /* | |
1663 | * Splice the data from the ring buffer to the tracefile. | |
1664 | * | |
79d4ffb7 DG |
1665 | * It must be called with the stream lock held. |
1666 | * | |
3bd1e081 MD |
1667 | * Returns the number of bytes spliced. |
1668 | */ | |
4078b776 | 1669 | ssize_t lttng_consumer_on_read_subbuffer_splice( |
3bd1e081 | 1670 | struct lttng_consumer_local_data *ctx, |
1d4dfdef | 1671 | struct lttng_consumer_stream *stream, unsigned long len, |
309167d2 | 1672 | unsigned long padding, |
50adc264 | 1673 | struct ctf_packet_index *index) |
3bd1e081 | 1674 | { |
f02e1e8a DG |
1675 | ssize_t ret = 0, written = 0, ret_splice = 0; |
1676 | loff_t offset = 0; | |
1677 | off_t orig_offset = stream->out_fd_offset; | |
1678 | int fd = stream->wait_fd; | |
1679 | /* Default is on the disk */ | |
1680 | int outfd = stream->out_fd; | |
f02e1e8a | 1681 | struct consumer_relayd_sock_pair *relayd = NULL; |
fb3a43a9 | 1682 | int *splice_pipe; |
8994307f | 1683 | unsigned int relayd_hang_up = 0; |
f02e1e8a | 1684 | |
3bd1e081 MD |
1685 | switch (consumer_data.type) { |
1686 | case LTTNG_CONSUMER_KERNEL: | |
f02e1e8a | 1687 | break; |
7753dea8 MD |
1688 | case LTTNG_CONSUMER32_UST: |
1689 | case LTTNG_CONSUMER64_UST: | |
f02e1e8a | 1690 | /* Not supported for user space tracing */ |
3bd1e081 MD |
1691 | return -ENOSYS; |
1692 | default: | |
1693 | ERR("Unknown consumer_data type"); | |
1694 | assert(0); | |
3bd1e081 MD |
1695 | } |
1696 | ||
f02e1e8a DG |
1697 | /* RCU lock for the relayd pointer */ |
1698 | rcu_read_lock(); | |
1699 | ||
1700 | /* Flag that the current stream if set for network streaming. */ | |
da009f2c | 1701 | if (stream->net_seq_idx != (uint64_t) -1ULL) { |
f02e1e8a DG |
1702 | relayd = consumer_find_relayd(stream->net_seq_idx); |
1703 | if (relayd == NULL) { | |
ad0b0d23 | 1704 | written = -ret; |
f02e1e8a DG |
1705 | goto end; |
1706 | } | |
1707 | } | |
1708 | ||
fb3a43a9 DG |
1709 | /* |
1710 | * Choose right pipe for splice. Metadata and trace data are handled by | |
1711 | * different threads hence the use of two pipes in order not to race or | |
1712 | * corrupt the written data. | |
1713 | */ | |
1714 | if (stream->metadata_flag) { | |
1715 | splice_pipe = ctx->consumer_splice_metadata_pipe; | |
1716 | } else { | |
1717 | splice_pipe = ctx->consumer_thread_pipe; | |
1718 | } | |
1719 | ||
f02e1e8a | 1720 | /* Write metadata stream id before payload */ |
1d4dfdef | 1721 | if (relayd) { |
ad0b0d23 | 1722 | unsigned long total_len = len; |
f02e1e8a | 1723 | |
1d4dfdef DG |
1724 | if (stream->metadata_flag) { |
1725 | /* | |
1726 | * Lock the control socket for the complete duration of the function | |
1727 | * since from this point on we will use the socket. | |
1728 | */ | |
1729 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1730 | ||
1731 | ret = write_relayd_metadata_id(splice_pipe[1], stream, relayd, | |
1732 | padding); | |
1733 | if (ret < 0) { | |
1734 | written = ret; | |
ad0b0d23 DG |
1735 | relayd_hang_up = 1; |
1736 | goto write_error; | |
1d4dfdef DG |
1737 | } |
1738 | ||
1739 | total_len += sizeof(struct lttcomm_relayd_metadata_payload); | |
1740 | } | |
1741 | ||
1742 | ret = write_relayd_stream_header(stream, total_len, padding, relayd); | |
ad0b0d23 DG |
1743 | if (ret < 0) { |
1744 | written = ret; | |
1745 | relayd_hang_up = 1; | |
1746 | goto write_error; | |
f02e1e8a | 1747 | } |
ad0b0d23 DG |
1748 | /* Use the returned socket. */ |
1749 | outfd = ret; | |
1d4dfdef DG |
1750 | } else { |
1751 | /* No streaming, we have to set the len with the full padding */ | |
1752 | len += padding; | |
1624d5b7 JD |
1753 | |
1754 | /* | |
1755 | * Check if we need to change the tracefile before writing the packet. | |
1756 | */ | |
1757 | if (stream->chan->tracefile_size > 0 && | |
1758 | (stream->tracefile_size_current + len) > | |
1759 | stream->chan->tracefile_size) { | |
fe4477ee JD |
1760 | ret = utils_rotate_stream_file(stream->chan->pathname, |
1761 | stream->name, stream->chan->tracefile_size, | |
1762 | stream->chan->tracefile_count, stream->uid, stream->gid, | |
309167d2 JD |
1763 | stream->out_fd, &(stream->tracefile_count_current), |
1764 | &stream->out_fd); | |
1624d5b7 | 1765 | if (ret < 0) { |
ad0b0d23 | 1766 | written = ret; |
1624d5b7 JD |
1767 | ERR("Rotating output file"); |
1768 | goto end; | |
1769 | } | |
309167d2 JD |
1770 | outfd = stream->out_fd; |
1771 | ||
1772 | if (stream->index_fd >= 0) { | |
1773 | ret = index_create_file(stream->chan->pathname, | |
1774 | stream->name, stream->uid, stream->gid, | |
1775 | stream->chan->tracefile_size, | |
1776 | stream->tracefile_count_current); | |
1777 | if (ret < 0) { | |
ad0b0d23 | 1778 | written = ret; |
309167d2 JD |
1779 | goto end; |
1780 | } | |
1781 | stream->index_fd = ret; | |
1782 | } | |
1783 | ||
a6976990 DG |
1784 | /* Reset current size because we just perform a rotation. */ |
1785 | stream->tracefile_size_current = 0; | |
a1ae300f JD |
1786 | stream->out_fd_offset = 0; |
1787 | orig_offset = 0; | |
1624d5b7 JD |
1788 | } |
1789 | stream->tracefile_size_current += len; | |
309167d2 | 1790 | index->offset = htobe64(stream->out_fd_offset); |
f02e1e8a DG |
1791 | } |
1792 | ||
1793 | while (len > 0) { | |
1d4dfdef DG |
1794 | DBG("splice chan to pipe offset %lu of len %lu (fd : %d, pipe: %d)", |
1795 | (unsigned long)offset, len, fd, splice_pipe[1]); | |
fb3a43a9 | 1796 | ret_splice = splice(fd, &offset, splice_pipe[1], NULL, len, |
f02e1e8a DG |
1797 | SPLICE_F_MOVE | SPLICE_F_MORE); |
1798 | DBG("splice chan to pipe, ret %zd", ret_splice); | |
1799 | if (ret_splice < 0) { | |
d02b8372 | 1800 | ret = errno; |
ad0b0d23 | 1801 | written = -ret; |
d02b8372 | 1802 | PERROR("Error in relay splice"); |
f02e1e8a DG |
1803 | goto splice_error; |
1804 | } | |
1805 | ||
1806 | /* Handle stream on the relayd if the output is on the network */ | |
ad0b0d23 DG |
1807 | if (relayd && stream->metadata_flag) { |
1808 | size_t metadata_payload_size = | |
1809 | sizeof(struct lttcomm_relayd_metadata_payload); | |
1810 | ||
1811 | /* Update counter to fit the spliced data */ | |
1812 | ret_splice += metadata_payload_size; | |
1813 | len += metadata_payload_size; | |
1814 | /* | |
1815 | * We do this so the return value can match the len passed as | |
1816 | * argument to this function. | |
1817 | */ | |
1818 | written -= metadata_payload_size; | |
f02e1e8a DG |
1819 | } |
1820 | ||
1821 | /* Splice data out */ | |
fb3a43a9 | 1822 | ret_splice = splice(splice_pipe[0], NULL, outfd, NULL, |
f02e1e8a | 1823 | ret_splice, SPLICE_F_MOVE | SPLICE_F_MORE); |
1d4dfdef | 1824 | DBG("Consumer splice pipe to file, ret %zd", ret_splice); |
f02e1e8a | 1825 | if (ret_splice < 0) { |
d02b8372 | 1826 | ret = errno; |
ad0b0d23 DG |
1827 | written = -ret; |
1828 | relayd_hang_up = 1; | |
1829 | goto write_error; | |
f02e1e8a | 1830 | } else if (ret_splice > len) { |
d02b8372 DG |
1831 | /* |
1832 | * We don't expect this code path to be executed but you never know | |
1833 | * so this is an extra protection agains a buggy splice(). | |
1834 | */ | |
f02e1e8a | 1835 | ret = errno; |
ad0b0d23 | 1836 | written += ret_splice; |
d02b8372 DG |
1837 | PERROR("Wrote more data than requested %zd (len: %lu)", ret_splice, |
1838 | len); | |
f02e1e8a | 1839 | goto splice_error; |
d02b8372 DG |
1840 | } else { |
1841 | /* All good, update current len and continue. */ | |
1842 | len -= ret_splice; | |
f02e1e8a | 1843 | } |
f02e1e8a DG |
1844 | |
1845 | /* This call is useless on a socket so better save a syscall. */ | |
1846 | if (!relayd) { | |
1847 | /* This won't block, but will start writeout asynchronously */ | |
1848 | lttng_sync_file_range(outfd, stream->out_fd_offset, ret_splice, | |
1849 | SYNC_FILE_RANGE_WRITE); | |
1850 | stream->out_fd_offset += ret_splice; | |
1851 | } | |
e5d1a9b3 | 1852 | stream->output_written += ret_splice; |
f02e1e8a DG |
1853 | written += ret_splice; |
1854 | } | |
1855 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
f02e1e8a DG |
1856 | goto end; |
1857 | ||
8994307f DG |
1858 | write_error: |
1859 | /* | |
1860 | * This is a special case that the relayd has closed its socket. Let's | |
1861 | * cleanup the relayd object and all associated streams. | |
1862 | */ | |
1863 | if (relayd && relayd_hang_up) { | |
1864 | cleanup_relayd(relayd, ctx); | |
1865 | /* Skip splice error so the consumer does not fail */ | |
1866 | goto end; | |
1867 | } | |
1868 | ||
f02e1e8a DG |
1869 | splice_error: |
1870 | /* send the appropriate error description to sessiond */ | |
1871 | switch (ret) { | |
f02e1e8a | 1872 | case EINVAL: |
f73fabfd | 1873 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_EINVAL); |
f02e1e8a DG |
1874 | break; |
1875 | case ENOMEM: | |
f73fabfd | 1876 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ENOMEM); |
f02e1e8a DG |
1877 | break; |
1878 | case ESPIPE: | |
f73fabfd | 1879 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ESPIPE); |
f02e1e8a DG |
1880 | break; |
1881 | } | |
1882 | ||
1883 | end: | |
1884 | if (relayd && stream->metadata_flag) { | |
1885 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1886 | } | |
1887 | ||
1888 | rcu_read_unlock(); | |
1889 | return written; | |
3bd1e081 MD |
1890 | } |
1891 | ||
1892 | /* | |
1893 | * Take a snapshot for a specific fd | |
1894 | * | |
1895 | * Returns 0 on success, < 0 on error | |
1896 | */ | |
ffe60014 | 1897 | int lttng_consumer_take_snapshot(struct lttng_consumer_stream *stream) |
3bd1e081 MD |
1898 | { |
1899 | switch (consumer_data.type) { | |
1900 | case LTTNG_CONSUMER_KERNEL: | |
ffe60014 | 1901 | return lttng_kconsumer_take_snapshot(stream); |
7753dea8 MD |
1902 | case LTTNG_CONSUMER32_UST: |
1903 | case LTTNG_CONSUMER64_UST: | |
ffe60014 | 1904 | return lttng_ustconsumer_take_snapshot(stream); |
3bd1e081 MD |
1905 | default: |
1906 | ERR("Unknown consumer_data type"); | |
1907 | assert(0); | |
1908 | return -ENOSYS; | |
1909 | } | |
3bd1e081 MD |
1910 | } |
1911 | ||
1912 | /* | |
1913 | * Get the produced position | |
1914 | * | |
1915 | * Returns 0 on success, < 0 on error | |
1916 | */ | |
ffe60014 | 1917 | int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream *stream, |
3bd1e081 MD |
1918 | unsigned long *pos) |
1919 | { | |
1920 | switch (consumer_data.type) { | |
1921 | case LTTNG_CONSUMER_KERNEL: | |
ffe60014 | 1922 | return lttng_kconsumer_get_produced_snapshot(stream, pos); |
7753dea8 MD |
1923 | case LTTNG_CONSUMER32_UST: |
1924 | case LTTNG_CONSUMER64_UST: | |
ffe60014 | 1925 | return lttng_ustconsumer_get_produced_snapshot(stream, pos); |
3bd1e081 MD |
1926 | default: |
1927 | ERR("Unknown consumer_data type"); | |
1928 | assert(0); | |
1929 | return -ENOSYS; | |
1930 | } | |
1931 | } | |
1932 | ||
1933 | int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, | |
1934 | int sock, struct pollfd *consumer_sockpoll) | |
1935 | { | |
1936 | switch (consumer_data.type) { | |
1937 | case LTTNG_CONSUMER_KERNEL: | |
1938 | return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
7753dea8 MD |
1939 | case LTTNG_CONSUMER32_UST: |
1940 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1941 | return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll); |
1942 | default: | |
1943 | ERR("Unknown consumer_data type"); | |
1944 | assert(0); | |
1945 | return -ENOSYS; | |
1946 | } | |
1947 | } | |
1948 | ||
6d574024 | 1949 | void lttng_consumer_close_all_metadata(void) |
d88aee68 DG |
1950 | { |
1951 | switch (consumer_data.type) { | |
1952 | case LTTNG_CONSUMER_KERNEL: | |
1953 | /* | |
1954 | * The Kernel consumer has a different metadata scheme so we don't | |
1955 | * close anything because the stream will be closed by the session | |
1956 | * daemon. | |
1957 | */ | |
1958 | break; | |
1959 | case LTTNG_CONSUMER32_UST: | |
1960 | case LTTNG_CONSUMER64_UST: | |
1961 | /* | |
1962 | * Close all metadata streams. The metadata hash table is passed and | |
1963 | * this call iterates over it by closing all wakeup fd. This is safe | |
1964 | * because at this point we are sure that the metadata producer is | |
1965 | * either dead or blocked. | |
1966 | */ | |
6d574024 | 1967 | lttng_ustconsumer_close_all_metadata(metadata_ht); |
d88aee68 DG |
1968 | break; |
1969 | default: | |
1970 | ERR("Unknown consumer_data type"); | |
1971 | assert(0); | |
1972 | } | |
1973 | } | |
1974 | ||
fb3a43a9 DG |
1975 | /* |
1976 | * Clean up a metadata stream and free its memory. | |
1977 | */ | |
e316aad5 DG |
1978 | void consumer_del_metadata_stream(struct lttng_consumer_stream *stream, |
1979 | struct lttng_ht *ht) | |
fb3a43a9 | 1980 | { |
e316aad5 | 1981 | struct lttng_consumer_channel *free_chan = NULL; |
fb3a43a9 DG |
1982 | |
1983 | assert(stream); | |
1984 | /* | |
1985 | * This call should NEVER receive regular stream. It must always be | |
1986 | * metadata stream and this is crucial for data structure synchronization. | |
1987 | */ | |
1988 | assert(stream->metadata_flag); | |
1989 | ||
e316aad5 DG |
1990 | DBG3("Consumer delete metadata stream %d", stream->wait_fd); |
1991 | ||
74251bb8 | 1992 | pthread_mutex_lock(&consumer_data.lock); |
a9838785 | 1993 | pthread_mutex_lock(&stream->chan->lock); |
8994307f DG |
1994 | pthread_mutex_lock(&stream->lock); |
1995 | ||
6d574024 DG |
1996 | /* Remove any reference to that stream. */ |
1997 | consumer_stream_delete(stream, ht); | |
ca22feea | 1998 | |
6d574024 DG |
1999 | /* Close down everything including the relayd if one. */ |
2000 | consumer_stream_close(stream); | |
2001 | /* Destroy tracer buffers of the stream. */ | |
2002 | consumer_stream_destroy_buffers(stream); | |
fb3a43a9 DG |
2003 | |
2004 | /* Atomically decrement channel refcount since other threads can use it. */ | |
f2ad556d | 2005 | if (!uatomic_sub_return(&stream->chan->refcount, 1) |
ffe60014 | 2006 | && !uatomic_read(&stream->chan->nb_init_stream_left)) { |
c30aaa51 | 2007 | /* Go for channel deletion! */ |
e316aad5 | 2008 | free_chan = stream->chan; |
fb3a43a9 DG |
2009 | } |
2010 | ||
73811ecc DG |
2011 | /* |
2012 | * Nullify the stream reference so it is not used after deletion. The | |
6d574024 DG |
2013 | * channel lock MUST be acquired before being able to check for a NULL |
2014 | * pointer value. | |
73811ecc DG |
2015 | */ |
2016 | stream->chan->metadata_stream = NULL; | |
2017 | ||
8994307f | 2018 | pthread_mutex_unlock(&stream->lock); |
a9838785 | 2019 | pthread_mutex_unlock(&stream->chan->lock); |
74251bb8 | 2020 | pthread_mutex_unlock(&consumer_data.lock); |
e316aad5 DG |
2021 | |
2022 | if (free_chan) { | |
2023 | consumer_del_channel(free_chan); | |
2024 | } | |
2025 | ||
6d574024 | 2026 | consumer_stream_free(stream); |
fb3a43a9 DG |
2027 | } |
2028 | ||
2029 | /* | |
2030 | * Action done with the metadata stream when adding it to the consumer internal | |
2031 | * data structures to handle it. | |
2032 | */ | |
5ab66908 | 2033 | int consumer_add_metadata_stream(struct lttng_consumer_stream *stream) |
fb3a43a9 | 2034 | { |
5ab66908 | 2035 | struct lttng_ht *ht = metadata_ht; |
e316aad5 | 2036 | int ret = 0; |
76082088 | 2037 | struct lttng_ht_iter iter; |
d88aee68 | 2038 | struct lttng_ht_node_u64 *node; |
fb3a43a9 | 2039 | |
e316aad5 DG |
2040 | assert(stream); |
2041 | assert(ht); | |
2042 | ||
d88aee68 | 2043 | DBG3("Adding metadata stream %" PRIu64 " to hash table", stream->key); |
e316aad5 DG |
2044 | |
2045 | pthread_mutex_lock(&consumer_data.lock); | |
a9838785 | 2046 | pthread_mutex_lock(&stream->chan->lock); |
ec6ea7d0 | 2047 | pthread_mutex_lock(&stream->chan->timer_lock); |
2e818a6a | 2048 | pthread_mutex_lock(&stream->lock); |
e316aad5 | 2049 | |
e316aad5 DG |
2050 | /* |
2051 | * From here, refcounts are updated so be _careful_ when returning an error | |
2052 | * after this point. | |
2053 | */ | |
2054 | ||
fb3a43a9 | 2055 | rcu_read_lock(); |
76082088 DG |
2056 | |
2057 | /* | |
2058 | * Lookup the stream just to make sure it does not exist in our internal | |
2059 | * state. This should NEVER happen. | |
2060 | */ | |
d88aee68 DG |
2061 | lttng_ht_lookup(ht, &stream->key, &iter); |
2062 | node = lttng_ht_iter_get_node_u64(&iter); | |
76082088 DG |
2063 | assert(!node); |
2064 | ||
e316aad5 | 2065 | /* |
ffe60014 DG |
2066 | * When nb_init_stream_left reaches 0, we don't need to trigger any action |
2067 | * in terms of destroying the associated channel, because the action that | |
e316aad5 DG |
2068 | * causes the count to become 0 also causes a stream to be added. The |
2069 | * channel deletion will thus be triggered by the following removal of this | |
2070 | * stream. | |
2071 | */ | |
ffe60014 | 2072 | if (uatomic_read(&stream->chan->nb_init_stream_left) > 0) { |
f2ad556d MD |
2073 | /* Increment refcount before decrementing nb_init_stream_left */ |
2074 | cmm_smp_wmb(); | |
ffe60014 | 2075 | uatomic_dec(&stream->chan->nb_init_stream_left); |
e316aad5 DG |
2076 | } |
2077 | ||
d88aee68 | 2078 | lttng_ht_add_unique_u64(ht, &stream->node); |
ca22feea | 2079 | |
d8ef542d MD |
2080 | lttng_ht_add_unique_u64(consumer_data.stream_per_chan_id_ht, |
2081 | &stream->node_channel_id); | |
2082 | ||
ca22feea DG |
2083 | /* |
2084 | * Add stream to the stream_list_ht of the consumer data. No need to steal | |
2085 | * the key since the HT does not use it and we allow to add redundant keys | |
2086 | * into this table. | |
2087 | */ | |
d88aee68 | 2088 | lttng_ht_add_u64(consumer_data.stream_list_ht, &stream->node_session_id); |
ca22feea | 2089 | |
fb3a43a9 | 2090 | rcu_read_unlock(); |
e316aad5 | 2091 | |
2e818a6a | 2092 | pthread_mutex_unlock(&stream->lock); |
a9838785 | 2093 | pthread_mutex_unlock(&stream->chan->lock); |
ec6ea7d0 | 2094 | pthread_mutex_unlock(&stream->chan->timer_lock); |
e316aad5 DG |
2095 | pthread_mutex_unlock(&consumer_data.lock); |
2096 | return ret; | |
fb3a43a9 DG |
2097 | } |
2098 | ||
8994307f DG |
2099 | /* |
2100 | * Delete data stream that are flagged for deletion (endpoint_status). | |
2101 | */ | |
2102 | static void validate_endpoint_status_data_stream(void) | |
2103 | { | |
2104 | struct lttng_ht_iter iter; | |
2105 | struct lttng_consumer_stream *stream; | |
2106 | ||
2107 | DBG("Consumer delete flagged data stream"); | |
2108 | ||
2109 | rcu_read_lock(); | |
2110 | cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) { | |
2111 | /* Validate delete flag of the stream */ | |
79d4ffb7 | 2112 | if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) { |
8994307f DG |
2113 | continue; |
2114 | } | |
2115 | /* Delete it right now */ | |
2116 | consumer_del_stream(stream, data_ht); | |
2117 | } | |
2118 | rcu_read_unlock(); | |
2119 | } | |
2120 | ||
2121 | /* | |
2122 | * Delete metadata stream that are flagged for deletion (endpoint_status). | |
2123 | */ | |
2124 | static void validate_endpoint_status_metadata_stream( | |
2125 | struct lttng_poll_event *pollset) | |
2126 | { | |
2127 | struct lttng_ht_iter iter; | |
2128 | struct lttng_consumer_stream *stream; | |
2129 | ||
2130 | DBG("Consumer delete flagged metadata stream"); | |
2131 | ||
2132 | assert(pollset); | |
2133 | ||
2134 | rcu_read_lock(); | |
2135 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) { | |
2136 | /* Validate delete flag of the stream */ | |
79d4ffb7 | 2137 | if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) { |
8994307f DG |
2138 | continue; |
2139 | } | |
2140 | /* | |
2141 | * Remove from pollset so the metadata thread can continue without | |
2142 | * blocking on a deleted stream. | |
2143 | */ | |
2144 | lttng_poll_del(pollset, stream->wait_fd); | |
2145 | ||
2146 | /* Delete it right now */ | |
2147 | consumer_del_metadata_stream(stream, metadata_ht); | |
2148 | } | |
2149 | rcu_read_unlock(); | |
2150 | } | |
2151 | ||
fb3a43a9 DG |
2152 | /* |
2153 | * Thread polls on metadata file descriptor and write them on disk or on the | |
2154 | * network. | |
2155 | */ | |
7d980def | 2156 | void *consumer_thread_metadata_poll(void *data) |
fb3a43a9 | 2157 | { |
1fc79fb4 | 2158 | int ret, i, pollfd, err = -1; |
fb3a43a9 | 2159 | uint32_t revents, nb_fd; |
e316aad5 | 2160 | struct lttng_consumer_stream *stream = NULL; |
fb3a43a9 | 2161 | struct lttng_ht_iter iter; |
d88aee68 | 2162 | struct lttng_ht_node_u64 *node; |
fb3a43a9 DG |
2163 | struct lttng_poll_event events; |
2164 | struct lttng_consumer_local_data *ctx = data; | |
2165 | ssize_t len; | |
2166 | ||
2167 | rcu_register_thread(); | |
2168 | ||
1fc79fb4 MD |
2169 | health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_METADATA); |
2170 | ||
2d57de81 MD |
2171 | if (testpoint(consumerd_thread_metadata)) { |
2172 | goto error_testpoint; | |
2173 | } | |
2174 | ||
9ce5646a MD |
2175 | health_code_update(); |
2176 | ||
fb3a43a9 DG |
2177 | DBG("Thread metadata poll started"); |
2178 | ||
fb3a43a9 DG |
2179 | /* Size is set to 1 for the consumer_metadata pipe */ |
2180 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
2181 | if (ret < 0) { | |
2182 | ERR("Poll set creation failed"); | |
d8ef542d | 2183 | goto end_poll; |
fb3a43a9 DG |
2184 | } |
2185 | ||
13886d2d DG |
2186 | ret = lttng_poll_add(&events, |
2187 | lttng_pipe_get_readfd(ctx->consumer_metadata_pipe), LPOLLIN); | |
fb3a43a9 DG |
2188 | if (ret < 0) { |
2189 | goto end; | |
2190 | } | |
2191 | ||
2192 | /* Main loop */ | |
2193 | DBG("Metadata main loop started"); | |
2194 | ||
2195 | while (1) { | |
9ce5646a MD |
2196 | health_code_update(); |
2197 | ||
fb3a43a9 | 2198 | /* Only the metadata pipe is set */ |
d21b0d71 | 2199 | if (LTTNG_POLL_GETNB(&events) == 0 && consumer_quit == 1) { |
1fc79fb4 | 2200 | err = 0; /* All is OK */ |
fb3a43a9 DG |
2201 | goto end; |
2202 | } | |
2203 | ||
2204 | restart: | |
d21b0d71 | 2205 | DBG("Metadata poll wait with %d fd(s)", LTTNG_POLL_GETNB(&events)); |
9ce5646a | 2206 | health_poll_entry(); |
fb3a43a9 | 2207 | ret = lttng_poll_wait(&events, -1); |
9ce5646a | 2208 | health_poll_exit(); |
fb3a43a9 DG |
2209 | DBG("Metadata event catched in thread"); |
2210 | if (ret < 0) { | |
2211 | if (errno == EINTR) { | |
e316aad5 | 2212 | ERR("Poll EINTR catched"); |
fb3a43a9 DG |
2213 | goto restart; |
2214 | } | |
2215 | goto error; | |
2216 | } | |
2217 | ||
0d9c5d77 DG |
2218 | nb_fd = ret; |
2219 | ||
e316aad5 | 2220 | /* From here, the event is a metadata wait fd */ |
fb3a43a9 | 2221 | for (i = 0; i < nb_fd; i++) { |
9ce5646a MD |
2222 | health_code_update(); |
2223 | ||
fb3a43a9 DG |
2224 | revents = LTTNG_POLL_GETEV(&events, i); |
2225 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2226 | ||
13886d2d | 2227 | if (pollfd == lttng_pipe_get_readfd(ctx->consumer_metadata_pipe)) { |
4adabd61 | 2228 | if (revents & (LPOLLERR | LPOLLHUP )) { |
fb3a43a9 DG |
2229 | DBG("Metadata thread pipe hung up"); |
2230 | /* | |
2231 | * Remove the pipe from the poll set and continue the loop | |
2232 | * since their might be data to consume. | |
2233 | */ | |
13886d2d DG |
2234 | lttng_poll_del(&events, |
2235 | lttng_pipe_get_readfd(ctx->consumer_metadata_pipe)); | |
2236 | lttng_pipe_read_close(ctx->consumer_metadata_pipe); | |
fb3a43a9 DG |
2237 | continue; |
2238 | } else if (revents & LPOLLIN) { | |
13886d2d DG |
2239 | ssize_t pipe_len; |
2240 | ||
2241 | pipe_len = lttng_pipe_read(ctx->consumer_metadata_pipe, | |
2242 | &stream, sizeof(stream)); | |
6cd525e8 MD |
2243 | if (pipe_len < sizeof(stream)) { |
2244 | PERROR("read metadata stream"); | |
fb3a43a9 | 2245 | /* |
13886d2d | 2246 | * Continue here to handle the rest of the streams. |
fb3a43a9 DG |
2247 | */ |
2248 | continue; | |
2249 | } | |
2250 | ||
8994307f DG |
2251 | /* A NULL stream means that the state has changed. */ |
2252 | if (stream == NULL) { | |
2253 | /* Check for deleted streams. */ | |
2254 | validate_endpoint_status_metadata_stream(&events); | |
3714380f | 2255 | goto restart; |
8994307f DG |
2256 | } |
2257 | ||
fb3a43a9 DG |
2258 | DBG("Adding metadata stream %d to poll set", |
2259 | stream->wait_fd); | |
2260 | ||
fb3a43a9 DG |
2261 | /* Add metadata stream to the global poll events list */ |
2262 | lttng_poll_add(&events, stream->wait_fd, | |
6d574024 | 2263 | LPOLLIN | LPOLLPRI | LPOLLHUP); |
fb3a43a9 DG |
2264 | } |
2265 | ||
e316aad5 | 2266 | /* Handle other stream */ |
fb3a43a9 DG |
2267 | continue; |
2268 | } | |
2269 | ||
d09e1200 | 2270 | rcu_read_lock(); |
d88aee68 DG |
2271 | { |
2272 | uint64_t tmp_id = (uint64_t) pollfd; | |
2273 | ||
2274 | lttng_ht_lookup(metadata_ht, &tmp_id, &iter); | |
2275 | } | |
2276 | node = lttng_ht_iter_get_node_u64(&iter); | |
e316aad5 | 2277 | assert(node); |
fb3a43a9 DG |
2278 | |
2279 | stream = caa_container_of(node, struct lttng_consumer_stream, | |
58b1f425 | 2280 | node); |
fb3a43a9 | 2281 | |
e316aad5 | 2282 | /* Check for error event */ |
4adabd61 | 2283 | if (revents & (LPOLLERR | LPOLLHUP)) { |
e316aad5 | 2284 | DBG("Metadata fd %d is hup|err.", pollfd); |
fb3a43a9 DG |
2285 | if (!stream->hangup_flush_done |
2286 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
2287 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
2288 | DBG("Attempting to flush and consume the UST buffers"); | |
2289 | lttng_ustconsumer_on_stream_hangup(stream); | |
2290 | ||
2291 | /* We just flushed the stream now read it. */ | |
4bb94b75 | 2292 | do { |
9ce5646a MD |
2293 | health_code_update(); |
2294 | ||
4bb94b75 DG |
2295 | len = ctx->on_buffer_ready(stream, ctx); |
2296 | /* | |
2297 | * We don't check the return value here since if we get | |
2298 | * a negative len, it means an error occured thus we | |
2299 | * simply remove it from the poll set and free the | |
2300 | * stream. | |
2301 | */ | |
2302 | } while (len > 0); | |
fb3a43a9 DG |
2303 | } |
2304 | ||
fb3a43a9 | 2305 | lttng_poll_del(&events, stream->wait_fd); |
e316aad5 DG |
2306 | /* |
2307 | * This call update the channel states, closes file descriptors | |
2308 | * and securely free the stream. | |
2309 | */ | |
2310 | consumer_del_metadata_stream(stream, metadata_ht); | |
2311 | } else if (revents & (LPOLLIN | LPOLLPRI)) { | |
2312 | /* Get the data out of the metadata file descriptor */ | |
2313 | DBG("Metadata available on fd %d", pollfd); | |
2314 | assert(stream->wait_fd == pollfd); | |
2315 | ||
04ef1097 | 2316 | do { |
9ce5646a MD |
2317 | health_code_update(); |
2318 | ||
04ef1097 MD |
2319 | len = ctx->on_buffer_ready(stream, ctx); |
2320 | /* | |
2321 | * We don't check the return value here since if we get | |
2322 | * a negative len, it means an error occured thus we | |
2323 | * simply remove it from the poll set and free the | |
2324 | * stream. | |
2325 | */ | |
2326 | } while (len > 0); | |
2327 | ||
e316aad5 | 2328 | /* It's ok to have an unavailable sub-buffer */ |
b64403e3 | 2329 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2330 | /* Clean up stream from consumer and free it. */ |
2331 | lttng_poll_del(&events, stream->wait_fd); | |
2332 | consumer_del_metadata_stream(stream, metadata_ht); | |
e316aad5 | 2333 | } |
fb3a43a9 | 2334 | } |
e316aad5 DG |
2335 | |
2336 | /* Release RCU lock for the stream looked up */ | |
d09e1200 | 2337 | rcu_read_unlock(); |
fb3a43a9 DG |
2338 | } |
2339 | } | |
2340 | ||
1fc79fb4 MD |
2341 | /* All is OK */ |
2342 | err = 0; | |
fb3a43a9 DG |
2343 | error: |
2344 | end: | |
2345 | DBG("Metadata poll thread exiting"); | |
fb3a43a9 | 2346 | |
d8ef542d MD |
2347 | lttng_poll_clean(&events); |
2348 | end_poll: | |
2d57de81 | 2349 | error_testpoint: |
1fc79fb4 MD |
2350 | if (err) { |
2351 | health_error(); | |
2352 | ERR("Health error occurred in %s", __func__); | |
2353 | } | |
2354 | health_unregister(health_consumerd); | |
fb3a43a9 DG |
2355 | rcu_unregister_thread(); |
2356 | return NULL; | |
2357 | } | |
2358 | ||
3bd1e081 | 2359 | /* |
e4421fec | 2360 | * This thread polls the fds in the set to consume the data and write |
3bd1e081 MD |
2361 | * it to tracefile if necessary. |
2362 | */ | |
7d980def | 2363 | void *consumer_thread_data_poll(void *data) |
3bd1e081 | 2364 | { |
1fc79fb4 | 2365 | int num_rdy, num_hup, high_prio, ret, i, err = -1; |
3bd1e081 MD |
2366 | struct pollfd *pollfd = NULL; |
2367 | /* local view of the streams */ | |
c869f647 | 2368 | struct lttng_consumer_stream **local_stream = NULL, *new_stream = NULL; |
3bd1e081 MD |
2369 | /* local view of consumer_data.fds_count */ |
2370 | int nb_fd = 0; | |
3bd1e081 | 2371 | struct lttng_consumer_local_data *ctx = data; |
00e2e675 | 2372 | ssize_t len; |
3bd1e081 | 2373 | |
e7b994a3 DG |
2374 | rcu_register_thread(); |
2375 | ||
1fc79fb4 MD |
2376 | health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_DATA); |
2377 | ||
2d57de81 MD |
2378 | if (testpoint(consumerd_thread_data)) { |
2379 | goto error_testpoint; | |
2380 | } | |
2381 | ||
9ce5646a MD |
2382 | health_code_update(); |
2383 | ||
4df6c8cb MD |
2384 | local_stream = zmalloc(sizeof(struct lttng_consumer_stream *)); |
2385 | if (local_stream == NULL) { | |
2386 | PERROR("local_stream malloc"); | |
2387 | goto end; | |
2388 | } | |
3bd1e081 MD |
2389 | |
2390 | while (1) { | |
9ce5646a MD |
2391 | health_code_update(); |
2392 | ||
3bd1e081 MD |
2393 | high_prio = 0; |
2394 | num_hup = 0; | |
2395 | ||
2396 | /* | |
e4421fec | 2397 | * the fds set has been updated, we need to update our |
3bd1e081 MD |
2398 | * local array as well |
2399 | */ | |
2400 | pthread_mutex_lock(&consumer_data.lock); | |
2401 | if (consumer_data.need_update) { | |
0e428499 DG |
2402 | free(pollfd); |
2403 | pollfd = NULL; | |
2404 | ||
2405 | free(local_stream); | |
2406 | local_stream = NULL; | |
3bd1e081 | 2407 | |
50f8ae69 | 2408 | /* allocate for all fds + 1 for the consumer_data_pipe */ |
effcf122 | 2409 | pollfd = zmalloc((consumer_data.stream_count + 1) * sizeof(struct pollfd)); |
3bd1e081 | 2410 | if (pollfd == NULL) { |
7a57cf92 | 2411 | PERROR("pollfd malloc"); |
3bd1e081 MD |
2412 | pthread_mutex_unlock(&consumer_data.lock); |
2413 | goto end; | |
2414 | } | |
2415 | ||
50f8ae69 | 2416 | /* allocate for all fds + 1 for the consumer_data_pipe */ |
effcf122 | 2417 | local_stream = zmalloc((consumer_data.stream_count + 1) * |
747f8642 | 2418 | sizeof(struct lttng_consumer_stream *)); |
3bd1e081 | 2419 | if (local_stream == NULL) { |
7a57cf92 | 2420 | PERROR("local_stream malloc"); |
3bd1e081 MD |
2421 | pthread_mutex_unlock(&consumer_data.lock); |
2422 | goto end; | |
2423 | } | |
ffe60014 | 2424 | ret = update_poll_array(ctx, &pollfd, local_stream, |
43c34bc3 | 2425 | data_ht); |
3bd1e081 MD |
2426 | if (ret < 0) { |
2427 | ERR("Error in allocating pollfd or local_outfds"); | |
f73fabfd | 2428 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
2429 | pthread_mutex_unlock(&consumer_data.lock); |
2430 | goto end; | |
2431 | } | |
2432 | nb_fd = ret; | |
2433 | consumer_data.need_update = 0; | |
2434 | } | |
2435 | pthread_mutex_unlock(&consumer_data.lock); | |
2436 | ||
4078b776 MD |
2437 | /* No FDs and consumer_quit, consumer_cleanup the thread */ |
2438 | if (nb_fd == 0 && consumer_quit == 1) { | |
1fc79fb4 | 2439 | err = 0; /* All is OK */ |
4078b776 MD |
2440 | goto end; |
2441 | } | |
3bd1e081 | 2442 | /* poll on the array of fds */ |
88f2b785 | 2443 | restart: |
3bd1e081 | 2444 | DBG("polling on %d fd", nb_fd + 1); |
9ce5646a | 2445 | health_poll_entry(); |
cb365c03 | 2446 | num_rdy = poll(pollfd, nb_fd + 1, -1); |
9ce5646a | 2447 | health_poll_exit(); |
3bd1e081 MD |
2448 | DBG("poll num_rdy : %d", num_rdy); |
2449 | if (num_rdy == -1) { | |
88f2b785 MD |
2450 | /* |
2451 | * Restart interrupted system call. | |
2452 | */ | |
2453 | if (errno == EINTR) { | |
2454 | goto restart; | |
2455 | } | |
7a57cf92 | 2456 | PERROR("Poll error"); |
f73fabfd | 2457 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
2458 | goto end; |
2459 | } else if (num_rdy == 0) { | |
2460 | DBG("Polling thread timed out"); | |
2461 | goto end; | |
2462 | } | |
2463 | ||
3bd1e081 | 2464 | /* |
50f8ae69 | 2465 | * If the consumer_data_pipe triggered poll go directly to the |
00e2e675 DG |
2466 | * beginning of the loop to update the array. We want to prioritize |
2467 | * array update over low-priority reads. | |
3bd1e081 | 2468 | */ |
509bb1cf | 2469 | if (pollfd[nb_fd].revents & (POLLIN | POLLPRI)) { |
ab30f567 | 2470 | ssize_t pipe_readlen; |
04fdd819 | 2471 | |
50f8ae69 | 2472 | DBG("consumer_data_pipe wake up"); |
acdb9057 DG |
2473 | pipe_readlen = lttng_pipe_read(ctx->consumer_data_pipe, |
2474 | &new_stream, sizeof(new_stream)); | |
6cd525e8 MD |
2475 | if (pipe_readlen < sizeof(new_stream)) { |
2476 | PERROR("Consumer data pipe"); | |
23f5f35d DG |
2477 | /* Continue so we can at least handle the current stream(s). */ |
2478 | continue; | |
2479 | } | |
c869f647 DG |
2480 | |
2481 | /* | |
2482 | * If the stream is NULL, just ignore it. It's also possible that | |
2483 | * the sessiond poll thread changed the consumer_quit state and is | |
2484 | * waking us up to test it. | |
2485 | */ | |
2486 | if (new_stream == NULL) { | |
8994307f | 2487 | validate_endpoint_status_data_stream(); |
c869f647 DG |
2488 | continue; |
2489 | } | |
2490 | ||
c869f647 | 2491 | /* Continue to update the local streams and handle prio ones */ |
3bd1e081 MD |
2492 | continue; |
2493 | } | |
2494 | ||
2495 | /* Take care of high priority channels first. */ | |
2496 | for (i = 0; i < nb_fd; i++) { | |
9ce5646a MD |
2497 | health_code_update(); |
2498 | ||
9617607b DG |
2499 | if (local_stream[i] == NULL) { |
2500 | continue; | |
2501 | } | |
fb3a43a9 | 2502 | if (pollfd[i].revents & POLLPRI) { |
d41f73b7 MD |
2503 | DBG("Urgent read on fd %d", pollfd[i].fd); |
2504 | high_prio = 1; | |
4078b776 | 2505 | len = ctx->on_buffer_ready(local_stream[i], ctx); |
d41f73b7 | 2506 | /* it's ok to have an unavailable sub-buffer */ |
b64403e3 | 2507 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2508 | /* Clean the stream and free it. */ |
2509 | consumer_del_stream(local_stream[i], data_ht); | |
9617607b | 2510 | local_stream[i] = NULL; |
4078b776 MD |
2511 | } else if (len > 0) { |
2512 | local_stream[i]->data_read = 1; | |
d41f73b7 | 2513 | } |
3bd1e081 MD |
2514 | } |
2515 | } | |
2516 | ||
4078b776 MD |
2517 | /* |
2518 | * If we read high prio channel in this loop, try again | |
2519 | * for more high prio data. | |
2520 | */ | |
2521 | if (high_prio) { | |
3bd1e081 MD |
2522 | continue; |
2523 | } | |
2524 | ||
2525 | /* Take care of low priority channels. */ | |
4078b776 | 2526 | for (i = 0; i < nb_fd; i++) { |
9ce5646a MD |
2527 | health_code_update(); |
2528 | ||
9617607b DG |
2529 | if (local_stream[i] == NULL) { |
2530 | continue; | |
2531 | } | |
4078b776 MD |
2532 | if ((pollfd[i].revents & POLLIN) || |
2533 | local_stream[i]->hangup_flush_done) { | |
4078b776 MD |
2534 | DBG("Normal read on fd %d", pollfd[i].fd); |
2535 | len = ctx->on_buffer_ready(local_stream[i], ctx); | |
2536 | /* it's ok to have an unavailable sub-buffer */ | |
b64403e3 | 2537 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2538 | /* Clean the stream and free it. */ |
2539 | consumer_del_stream(local_stream[i], data_ht); | |
9617607b | 2540 | local_stream[i] = NULL; |
4078b776 MD |
2541 | } else if (len > 0) { |
2542 | local_stream[i]->data_read = 1; | |
2543 | } | |
2544 | } | |
2545 | } | |
2546 | ||
2547 | /* Handle hangup and errors */ | |
2548 | for (i = 0; i < nb_fd; i++) { | |
9ce5646a MD |
2549 | health_code_update(); |
2550 | ||
9617607b DG |
2551 | if (local_stream[i] == NULL) { |
2552 | continue; | |
2553 | } | |
4078b776 MD |
2554 | if (!local_stream[i]->hangup_flush_done |
2555 | && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL)) | |
2556 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
2557 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
2558 | DBG("fd %d is hup|err|nval. Attempting flush and read.", | |
9617607b | 2559 | pollfd[i].fd); |
4078b776 MD |
2560 | lttng_ustconsumer_on_stream_hangup(local_stream[i]); |
2561 | /* Attempt read again, for the data we just flushed. */ | |
2562 | local_stream[i]->data_read = 1; | |
2563 | } | |
2564 | /* | |
2565 | * If the poll flag is HUP/ERR/NVAL and we have | |
2566 | * read no data in this pass, we can remove the | |
2567 | * stream from its hash table. | |
2568 | */ | |
2569 | if ((pollfd[i].revents & POLLHUP)) { | |
2570 | DBG("Polling fd %d tells it has hung up.", pollfd[i].fd); | |
2571 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2572 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2573 | local_stream[i] = NULL; |
4078b776 MD |
2574 | num_hup++; |
2575 | } | |
2576 | } else if (pollfd[i].revents & POLLERR) { | |
2577 | ERR("Error returned in polling fd %d.", pollfd[i].fd); | |
2578 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2579 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2580 | local_stream[i] = NULL; |
4078b776 MD |
2581 | num_hup++; |
2582 | } | |
2583 | } else if (pollfd[i].revents & POLLNVAL) { | |
2584 | ERR("Polling fd %d tells fd is not open.", pollfd[i].fd); | |
2585 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2586 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2587 | local_stream[i] = NULL; |
4078b776 | 2588 | num_hup++; |
3bd1e081 MD |
2589 | } |
2590 | } | |
9617607b DG |
2591 | if (local_stream[i] != NULL) { |
2592 | local_stream[i]->data_read = 0; | |
2593 | } | |
3bd1e081 MD |
2594 | } |
2595 | } | |
1fc79fb4 MD |
2596 | /* All is OK */ |
2597 | err = 0; | |
3bd1e081 MD |
2598 | end: |
2599 | DBG("polling thread exiting"); | |
0e428499 DG |
2600 | free(pollfd); |
2601 | free(local_stream); | |
fb3a43a9 DG |
2602 | |
2603 | /* | |
2604 | * Close the write side of the pipe so epoll_wait() in | |
7d980def DG |
2605 | * consumer_thread_metadata_poll can catch it. The thread is monitoring the |
2606 | * read side of the pipe. If we close them both, epoll_wait strangely does | |
2607 | * not return and could create a endless wait period if the pipe is the | |
2608 | * only tracked fd in the poll set. The thread will take care of closing | |
2609 | * the read side. | |
fb3a43a9 | 2610 | */ |
13886d2d | 2611 | (void) lttng_pipe_write_close(ctx->consumer_metadata_pipe); |
fb3a43a9 | 2612 | |
2d57de81 | 2613 | error_testpoint: |
1fc79fb4 MD |
2614 | if (err) { |
2615 | health_error(); | |
2616 | ERR("Health error occurred in %s", __func__); | |
2617 | } | |
2618 | health_unregister(health_consumerd); | |
2619 | ||
e7b994a3 | 2620 | rcu_unregister_thread(); |
3bd1e081 MD |
2621 | return NULL; |
2622 | } | |
2623 | ||
d8ef542d MD |
2624 | /* |
2625 | * Close wake-up end of each stream belonging to the channel. This will | |
2626 | * allow the poll() on the stream read-side to detect when the | |
2627 | * write-side (application) finally closes them. | |
2628 | */ | |
2629 | static | |
2630 | void consumer_close_channel_streams(struct lttng_consumer_channel *channel) | |
2631 | { | |
2632 | struct lttng_ht *ht; | |
2633 | struct lttng_consumer_stream *stream; | |
2634 | struct lttng_ht_iter iter; | |
2635 | ||
2636 | ht = consumer_data.stream_per_chan_id_ht; | |
2637 | ||
2638 | rcu_read_lock(); | |
2639 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
2640 | ht->hash_fct(&channel->key, lttng_ht_seed), | |
2641 | ht->match_fct, &channel->key, | |
2642 | &iter.iter, stream, node_channel_id.node) { | |
f2ad556d MD |
2643 | /* |
2644 | * Protect against teardown with mutex. | |
2645 | */ | |
2646 | pthread_mutex_lock(&stream->lock); | |
2647 | if (cds_lfht_is_node_deleted(&stream->node.node)) { | |
2648 | goto next; | |
2649 | } | |
d8ef542d MD |
2650 | switch (consumer_data.type) { |
2651 | case LTTNG_CONSUMER_KERNEL: | |
2652 | break; | |
2653 | case LTTNG_CONSUMER32_UST: | |
2654 | case LTTNG_CONSUMER64_UST: | |
b4a650f3 DG |
2655 | if (stream->metadata_flag) { |
2656 | /* Safe and protected by the stream lock. */ | |
2657 | lttng_ustconsumer_close_metadata(stream->chan); | |
2658 | } else { | |
2659 | /* | |
2660 | * Note: a mutex is taken internally within | |
2661 | * liblttng-ust-ctl to protect timer wakeup_fd | |
2662 | * use from concurrent close. | |
2663 | */ | |
2664 | lttng_ustconsumer_close_stream_wakeup(stream); | |
2665 | } | |
d8ef542d MD |
2666 | break; |
2667 | default: | |
2668 | ERR("Unknown consumer_data type"); | |
2669 | assert(0); | |
2670 | } | |
f2ad556d MD |
2671 | next: |
2672 | pthread_mutex_unlock(&stream->lock); | |
d8ef542d MD |
2673 | } |
2674 | rcu_read_unlock(); | |
2675 | } | |
2676 | ||
2677 | static void destroy_channel_ht(struct lttng_ht *ht) | |
2678 | { | |
2679 | struct lttng_ht_iter iter; | |
2680 | struct lttng_consumer_channel *channel; | |
2681 | int ret; | |
2682 | ||
2683 | if (ht == NULL) { | |
2684 | return; | |
2685 | } | |
2686 | ||
2687 | rcu_read_lock(); | |
2688 | cds_lfht_for_each_entry(ht->ht, &iter.iter, channel, wait_fd_node.node) { | |
2689 | ret = lttng_ht_del(ht, &iter); | |
2690 | assert(ret != 0); | |
2691 | } | |
2692 | rcu_read_unlock(); | |
2693 | ||
2694 | lttng_ht_destroy(ht); | |
2695 | } | |
2696 | ||
2697 | /* | |
2698 | * This thread polls the channel fds to detect when they are being | |
2699 | * closed. It closes all related streams if the channel is detected as | |
2700 | * closed. It is currently only used as a shim layer for UST because the | |
2701 | * consumerd needs to keep the per-stream wakeup end of pipes open for | |
2702 | * periodical flush. | |
2703 | */ | |
2704 | void *consumer_thread_channel_poll(void *data) | |
2705 | { | |
1fc79fb4 | 2706 | int ret, i, pollfd, err = -1; |
d8ef542d MD |
2707 | uint32_t revents, nb_fd; |
2708 | struct lttng_consumer_channel *chan = NULL; | |
2709 | struct lttng_ht_iter iter; | |
2710 | struct lttng_ht_node_u64 *node; | |
2711 | struct lttng_poll_event events; | |
2712 | struct lttng_consumer_local_data *ctx = data; | |
2713 | struct lttng_ht *channel_ht; | |
2714 | ||
2715 | rcu_register_thread(); | |
2716 | ||
1fc79fb4 MD |
2717 | health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_CHANNEL); |
2718 | ||
2d57de81 MD |
2719 | if (testpoint(consumerd_thread_channel)) { |
2720 | goto error_testpoint; | |
2721 | } | |
2722 | ||
9ce5646a MD |
2723 | health_code_update(); |
2724 | ||
d8ef542d MD |
2725 | channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
2726 | if (!channel_ht) { | |
2727 | /* ENOMEM at this point. Better to bail out. */ | |
2728 | goto end_ht; | |
2729 | } | |
2730 | ||
2731 | DBG("Thread channel poll started"); | |
2732 | ||
2733 | /* Size is set to 1 for the consumer_channel pipe */ | |
2734 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
2735 | if (ret < 0) { | |
2736 | ERR("Poll set creation failed"); | |
2737 | goto end_poll; | |
2738 | } | |
2739 | ||
2740 | ret = lttng_poll_add(&events, ctx->consumer_channel_pipe[0], LPOLLIN); | |
2741 | if (ret < 0) { | |
2742 | goto end; | |
2743 | } | |
2744 | ||
2745 | /* Main loop */ | |
2746 | DBG("Channel main loop started"); | |
2747 | ||
2748 | while (1) { | |
9ce5646a MD |
2749 | health_code_update(); |
2750 | ||
d8ef542d MD |
2751 | /* Only the channel pipe is set */ |
2752 | if (LTTNG_POLL_GETNB(&events) == 0 && consumer_quit == 1) { | |
1fc79fb4 | 2753 | err = 0; /* All is OK */ |
d8ef542d MD |
2754 | goto end; |
2755 | } | |
2756 | ||
2757 | restart: | |
2758 | DBG("Channel poll wait with %d fd(s)", LTTNG_POLL_GETNB(&events)); | |
9ce5646a | 2759 | health_poll_entry(); |
d8ef542d | 2760 | ret = lttng_poll_wait(&events, -1); |
9ce5646a | 2761 | health_poll_exit(); |
d8ef542d MD |
2762 | DBG("Channel event catched in thread"); |
2763 | if (ret < 0) { | |
2764 | if (errno == EINTR) { | |
2765 | ERR("Poll EINTR catched"); | |
2766 | goto restart; | |
2767 | } | |
2768 | goto end; | |
2769 | } | |
2770 | ||
2771 | nb_fd = ret; | |
2772 | ||
2773 | /* From here, the event is a channel wait fd */ | |
2774 | for (i = 0; i < nb_fd; i++) { | |
9ce5646a MD |
2775 | health_code_update(); |
2776 | ||
d8ef542d MD |
2777 | revents = LTTNG_POLL_GETEV(&events, i); |
2778 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2779 | ||
2780 | /* Just don't waste time if no returned events for the fd */ | |
2781 | if (!revents) { | |
2782 | continue; | |
2783 | } | |
2784 | if (pollfd == ctx->consumer_channel_pipe[0]) { | |
2785 | if (revents & (LPOLLERR | LPOLLHUP)) { | |
2786 | DBG("Channel thread pipe hung up"); | |
2787 | /* | |
2788 | * Remove the pipe from the poll set and continue the loop | |
2789 | * since their might be data to consume. | |
2790 | */ | |
2791 | lttng_poll_del(&events, ctx->consumer_channel_pipe[0]); | |
2792 | continue; | |
2793 | } else if (revents & LPOLLIN) { | |
2794 | enum consumer_channel_action action; | |
a0cbdd2e | 2795 | uint64_t key; |
d8ef542d | 2796 | |
a0cbdd2e | 2797 | ret = read_channel_pipe(ctx, &chan, &key, &action); |
d8ef542d MD |
2798 | if (ret <= 0) { |
2799 | ERR("Error reading channel pipe"); | |
2800 | continue; | |
2801 | } | |
2802 | ||
2803 | switch (action) { | |
2804 | case CONSUMER_CHANNEL_ADD: | |
2805 | DBG("Adding channel %d to poll set", | |
2806 | chan->wait_fd); | |
2807 | ||
2808 | lttng_ht_node_init_u64(&chan->wait_fd_node, | |
2809 | chan->wait_fd); | |
c7260a81 | 2810 | rcu_read_lock(); |
d8ef542d MD |
2811 | lttng_ht_add_unique_u64(channel_ht, |
2812 | &chan->wait_fd_node); | |
c7260a81 | 2813 | rcu_read_unlock(); |
d8ef542d MD |
2814 | /* Add channel to the global poll events list */ |
2815 | lttng_poll_add(&events, chan->wait_fd, | |
2816 | LPOLLIN | LPOLLPRI); | |
2817 | break; | |
a0cbdd2e MD |
2818 | case CONSUMER_CHANNEL_DEL: |
2819 | { | |
b4a650f3 DG |
2820 | /* |
2821 | * This command should never be called if the channel | |
2822 | * has streams monitored by either the data or metadata | |
2823 | * thread. The consumer only notify this thread with a | |
2824 | * channel del. command if it receives a destroy | |
2825 | * channel command from the session daemon that send it | |
2826 | * if a command prior to the GET_CHANNEL failed. | |
2827 | */ | |
2828 | ||
c7260a81 | 2829 | rcu_read_lock(); |
a0cbdd2e MD |
2830 | chan = consumer_find_channel(key); |
2831 | if (!chan) { | |
c7260a81 | 2832 | rcu_read_unlock(); |
a0cbdd2e MD |
2833 | ERR("UST consumer get channel key %" PRIu64 " not found for del channel", key); |
2834 | break; | |
2835 | } | |
2836 | lttng_poll_del(&events, chan->wait_fd); | |
f623cc0b | 2837 | iter.iter.node = &chan->wait_fd_node.node; |
a0cbdd2e MD |
2838 | ret = lttng_ht_del(channel_ht, &iter); |
2839 | assert(ret == 0); | |
a0cbdd2e | 2840 | |
f2a444f1 DG |
2841 | switch (consumer_data.type) { |
2842 | case LTTNG_CONSUMER_KERNEL: | |
2843 | break; | |
2844 | case LTTNG_CONSUMER32_UST: | |
2845 | case LTTNG_CONSUMER64_UST: | |
212d67a2 DG |
2846 | health_code_update(); |
2847 | /* Destroy streams that might have been left in the stream list. */ | |
2848 | clean_channel_stream_list(chan); | |
f2a444f1 DG |
2849 | break; |
2850 | default: | |
2851 | ERR("Unknown consumer_data type"); | |
2852 | assert(0); | |
2853 | } | |
2854 | ||
a0cbdd2e MD |
2855 | /* |
2856 | * Release our own refcount. Force channel deletion even if | |
2857 | * streams were not initialized. | |
2858 | */ | |
2859 | if (!uatomic_sub_return(&chan->refcount, 1)) { | |
2860 | consumer_del_channel(chan); | |
2861 | } | |
c7260a81 | 2862 | rcu_read_unlock(); |
a0cbdd2e MD |
2863 | goto restart; |
2864 | } | |
d8ef542d MD |
2865 | case CONSUMER_CHANNEL_QUIT: |
2866 | /* | |
2867 | * Remove the pipe from the poll set and continue the loop | |
2868 | * since their might be data to consume. | |
2869 | */ | |
2870 | lttng_poll_del(&events, ctx->consumer_channel_pipe[0]); | |
2871 | continue; | |
2872 | default: | |
2873 | ERR("Unknown action"); | |
2874 | break; | |
2875 | } | |
2876 | } | |
2877 | ||
2878 | /* Handle other stream */ | |
2879 | continue; | |
2880 | } | |
2881 | ||
2882 | rcu_read_lock(); | |
2883 | { | |
2884 | uint64_t tmp_id = (uint64_t) pollfd; | |
2885 | ||
2886 | lttng_ht_lookup(channel_ht, &tmp_id, &iter); | |
2887 | } | |
2888 | node = lttng_ht_iter_get_node_u64(&iter); | |
2889 | assert(node); | |
2890 | ||
2891 | chan = caa_container_of(node, struct lttng_consumer_channel, | |
2892 | wait_fd_node); | |
2893 | ||
2894 | /* Check for error event */ | |
2895 | if (revents & (LPOLLERR | LPOLLHUP)) { | |
2896 | DBG("Channel fd %d is hup|err.", pollfd); | |
2897 | ||
2898 | lttng_poll_del(&events, chan->wait_fd); | |
2899 | ret = lttng_ht_del(channel_ht, &iter); | |
2900 | assert(ret == 0); | |
b4a650f3 DG |
2901 | |
2902 | /* | |
2903 | * This will close the wait fd for each stream associated to | |
2904 | * this channel AND monitored by the data/metadata thread thus | |
2905 | * will be clean by the right thread. | |
2906 | */ | |
d8ef542d | 2907 | consumer_close_channel_streams(chan); |
f2ad556d MD |
2908 | |
2909 | /* Release our own refcount */ | |
2910 | if (!uatomic_sub_return(&chan->refcount, 1) | |
2911 | && !uatomic_read(&chan->nb_init_stream_left)) { | |
2912 | consumer_del_channel(chan); | |
2913 | } | |
d8ef542d MD |
2914 | } |
2915 | ||
2916 | /* Release RCU lock for the channel looked up */ | |
2917 | rcu_read_unlock(); | |
2918 | } | |
2919 | } | |
2920 | ||
1fc79fb4 MD |
2921 | /* All is OK */ |
2922 | err = 0; | |
d8ef542d MD |
2923 | end: |
2924 | lttng_poll_clean(&events); | |
2925 | end_poll: | |
2926 | destroy_channel_ht(channel_ht); | |
2927 | end_ht: | |
2d57de81 | 2928 | error_testpoint: |
d8ef542d | 2929 | DBG("Channel poll thread exiting"); |
1fc79fb4 MD |
2930 | if (err) { |
2931 | health_error(); | |
2932 | ERR("Health error occurred in %s", __func__); | |
2933 | } | |
2934 | health_unregister(health_consumerd); | |
d8ef542d MD |
2935 | rcu_unregister_thread(); |
2936 | return NULL; | |
2937 | } | |
2938 | ||
331744e3 JD |
2939 | static int set_metadata_socket(struct lttng_consumer_local_data *ctx, |
2940 | struct pollfd *sockpoll, int client_socket) | |
2941 | { | |
2942 | int ret; | |
2943 | ||
2944 | assert(ctx); | |
2945 | assert(sockpoll); | |
2946 | ||
2947 | if (lttng_consumer_poll_socket(sockpoll) < 0) { | |
2948 | ret = -1; | |
2949 | goto error; | |
2950 | } | |
2951 | DBG("Metadata connection on client_socket"); | |
2952 | ||
2953 | /* Blocking call, waiting for transmission */ | |
2954 | ctx->consumer_metadata_socket = lttcomm_accept_unix_sock(client_socket); | |
2955 | if (ctx->consumer_metadata_socket < 0) { | |
2956 | WARN("On accept metadata"); | |
2957 | ret = -1; | |
2958 | goto error; | |
2959 | } | |
2960 | ret = 0; | |
2961 | ||
2962 | error: | |
2963 | return ret; | |
2964 | } | |
2965 | ||
3bd1e081 MD |
2966 | /* |
2967 | * This thread listens on the consumerd socket and receives the file | |
2968 | * descriptors from the session daemon. | |
2969 | */ | |
7d980def | 2970 | void *consumer_thread_sessiond_poll(void *data) |
3bd1e081 | 2971 | { |
1fc79fb4 | 2972 | int sock = -1, client_socket, ret, err = -1; |
3bd1e081 MD |
2973 | /* |
2974 | * structure to poll for incoming data on communication socket avoids | |
2975 | * making blocking sockets. | |
2976 | */ | |
2977 | struct pollfd consumer_sockpoll[2]; | |
2978 | struct lttng_consumer_local_data *ctx = data; | |
2979 | ||
e7b994a3 DG |
2980 | rcu_register_thread(); |
2981 | ||
1fc79fb4 MD |
2982 | health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_SESSIOND); |
2983 | ||
2d57de81 MD |
2984 | if (testpoint(consumerd_thread_sessiond)) { |
2985 | goto error_testpoint; | |
2986 | } | |
2987 | ||
9ce5646a MD |
2988 | health_code_update(); |
2989 | ||
3bd1e081 MD |
2990 | DBG("Creating command socket %s", ctx->consumer_command_sock_path); |
2991 | unlink(ctx->consumer_command_sock_path); | |
2992 | client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path); | |
2993 | if (client_socket < 0) { | |
2994 | ERR("Cannot create command socket"); | |
2995 | goto end; | |
2996 | } | |
2997 | ||
2998 | ret = lttcomm_listen_unix_sock(client_socket); | |
2999 | if (ret < 0) { | |
3000 | goto end; | |
3001 | } | |
3002 | ||
32258573 | 3003 | DBG("Sending ready command to lttng-sessiond"); |
f73fabfd | 3004 | ret = lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_COMMAND_SOCK_READY); |
3bd1e081 MD |
3005 | /* return < 0 on error, but == 0 is not fatal */ |
3006 | if (ret < 0) { | |
32258573 | 3007 | ERR("Error sending ready command to lttng-sessiond"); |
3bd1e081 MD |
3008 | goto end; |
3009 | } | |
3010 | ||
3bd1e081 MD |
3011 | /* prepare the FDs to poll : to client socket and the should_quit pipe */ |
3012 | consumer_sockpoll[0].fd = ctx->consumer_should_quit[0]; | |
3013 | consumer_sockpoll[0].events = POLLIN | POLLPRI; | |
3014 | consumer_sockpoll[1].fd = client_socket; | |
3015 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
3016 | ||
3017 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
3018 | goto end; | |
3019 | } | |
3020 | DBG("Connection on client_socket"); | |
3021 | ||
3022 | /* Blocking call, waiting for transmission */ | |
3023 | sock = lttcomm_accept_unix_sock(client_socket); | |
534d2592 | 3024 | if (sock < 0) { |
3bd1e081 MD |
3025 | WARN("On accept"); |
3026 | goto end; | |
3027 | } | |
3bd1e081 | 3028 | |
331744e3 JD |
3029 | /* |
3030 | * Setup metadata socket which is the second socket connection on the | |
3031 | * command unix socket. | |
3032 | */ | |
3033 | ret = set_metadata_socket(ctx, consumer_sockpoll, client_socket); | |
3034 | if (ret < 0) { | |
3035 | goto end; | |
3036 | } | |
3037 | ||
d96f09c6 DG |
3038 | /* This socket is not useful anymore. */ |
3039 | ret = close(client_socket); | |
3040 | if (ret < 0) { | |
3041 | PERROR("close client_socket"); | |
3042 | } | |
3043 | client_socket = -1; | |
3044 | ||
3bd1e081 MD |
3045 | /* update the polling structure to poll on the established socket */ |
3046 | consumer_sockpoll[1].fd = sock; | |
3047 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
3048 | ||
3049 | while (1) { | |
9ce5646a MD |
3050 | health_code_update(); |
3051 | ||
3052 | health_poll_entry(); | |
3053 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
3054 | health_poll_exit(); | |
3055 | if (ret < 0) { | |
3bd1e081 MD |
3056 | goto end; |
3057 | } | |
3058 | DBG("Incoming command on sock"); | |
3059 | ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
3060 | if (ret == -ENOENT) { | |
3061 | DBG("Received STOP command"); | |
3062 | goto end; | |
3063 | } | |
4cbc1a04 DG |
3064 | if (ret <= 0) { |
3065 | /* | |
3066 | * This could simply be a session daemon quitting. Don't output | |
3067 | * ERR() here. | |
3068 | */ | |
3069 | DBG("Communication interrupted on command socket"); | |
41ba6035 | 3070 | err = 0; |
3bd1e081 MD |
3071 | goto end; |
3072 | } | |
3073 | if (consumer_quit) { | |
3074 | DBG("consumer_thread_receive_fds received quit from signal"); | |
1fc79fb4 | 3075 | err = 0; /* All is OK */ |
3bd1e081 MD |
3076 | goto end; |
3077 | } | |
ffe60014 | 3078 | DBG("received command on sock"); |
3bd1e081 | 3079 | } |
1fc79fb4 MD |
3080 | /* All is OK */ |
3081 | err = 0; | |
3082 | ||
3bd1e081 | 3083 | end: |
ffe60014 | 3084 | DBG("Consumer thread sessiond poll exiting"); |
3bd1e081 | 3085 | |
d88aee68 DG |
3086 | /* |
3087 | * Close metadata streams since the producer is the session daemon which | |
3088 | * just died. | |
3089 | * | |
3090 | * NOTE: for now, this only applies to the UST tracer. | |
3091 | */ | |
6d574024 | 3092 | lttng_consumer_close_all_metadata(); |
d88aee68 | 3093 | |
3bd1e081 MD |
3094 | /* |
3095 | * when all fds have hung up, the polling thread | |
3096 | * can exit cleanly | |
3097 | */ | |
3098 | consumer_quit = 1; | |
3099 | ||
04fdd819 | 3100 | /* |
c869f647 | 3101 | * Notify the data poll thread to poll back again and test the |
8994307f | 3102 | * consumer_quit state that we just set so to quit gracefully. |
04fdd819 | 3103 | */ |
acdb9057 | 3104 | notify_thread_lttng_pipe(ctx->consumer_data_pipe); |
c869f647 | 3105 | |
a0cbdd2e | 3106 | notify_channel_pipe(ctx, NULL, -1, CONSUMER_CHANNEL_QUIT); |
d8ef542d | 3107 | |
5c635c72 MD |
3108 | notify_health_quit_pipe(health_quit_pipe); |
3109 | ||
d96f09c6 DG |
3110 | /* Cleaning up possibly open sockets. */ |
3111 | if (sock >= 0) { | |
3112 | ret = close(sock); | |
3113 | if (ret < 0) { | |
3114 | PERROR("close sock sessiond poll"); | |
3115 | } | |
3116 | } | |
3117 | if (client_socket >= 0) { | |
38476d24 | 3118 | ret = close(client_socket); |
d96f09c6 DG |
3119 | if (ret < 0) { |
3120 | PERROR("close client_socket sessiond poll"); | |
3121 | } | |
3122 | } | |
3123 | ||
2d57de81 | 3124 | error_testpoint: |
1fc79fb4 MD |
3125 | if (err) { |
3126 | health_error(); | |
3127 | ERR("Health error occurred in %s", __func__); | |
3128 | } | |
3129 | health_unregister(health_consumerd); | |
3130 | ||
e7b994a3 | 3131 | rcu_unregister_thread(); |
3bd1e081 MD |
3132 | return NULL; |
3133 | } | |
d41f73b7 | 3134 | |
4078b776 | 3135 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
3136 | struct lttng_consumer_local_data *ctx) |
3137 | { | |
74251bb8 DG |
3138 | ssize_t ret; |
3139 | ||
3140 | pthread_mutex_lock(&stream->lock); | |
94d49140 JD |
3141 | if (stream->metadata_flag) { |
3142 | pthread_mutex_lock(&stream->metadata_rdv_lock); | |
3143 | } | |
74251bb8 | 3144 | |
d41f73b7 MD |
3145 | switch (consumer_data.type) { |
3146 | case LTTNG_CONSUMER_KERNEL: | |
74251bb8 DG |
3147 | ret = lttng_kconsumer_read_subbuffer(stream, ctx); |
3148 | break; | |
7753dea8 MD |
3149 | case LTTNG_CONSUMER32_UST: |
3150 | case LTTNG_CONSUMER64_UST: | |
74251bb8 DG |
3151 | ret = lttng_ustconsumer_read_subbuffer(stream, ctx); |
3152 | break; | |
d41f73b7 MD |
3153 | default: |
3154 | ERR("Unknown consumer_data type"); | |
3155 | assert(0); | |
74251bb8 DG |
3156 | ret = -ENOSYS; |
3157 | break; | |
d41f73b7 | 3158 | } |
74251bb8 | 3159 | |
94d49140 JD |
3160 | if (stream->metadata_flag) { |
3161 | pthread_cond_broadcast(&stream->metadata_rdv); | |
3162 | pthread_mutex_unlock(&stream->metadata_rdv_lock); | |
3163 | } | |
74251bb8 DG |
3164 | pthread_mutex_unlock(&stream->lock); |
3165 | return ret; | |
d41f73b7 MD |
3166 | } |
3167 | ||
3168 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
3169 | { | |
3170 | switch (consumer_data.type) { | |
3171 | case LTTNG_CONSUMER_KERNEL: | |
3172 | return lttng_kconsumer_on_recv_stream(stream); | |
7753dea8 MD |
3173 | case LTTNG_CONSUMER32_UST: |
3174 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
3175 | return lttng_ustconsumer_on_recv_stream(stream); |
3176 | default: | |
3177 | ERR("Unknown consumer_data type"); | |
3178 | assert(0); | |
3179 | return -ENOSYS; | |
3180 | } | |
3181 | } | |
e4421fec DG |
3182 | |
3183 | /* | |
3184 | * Allocate and set consumer data hash tables. | |
3185 | */ | |
282dadbc | 3186 | int lttng_consumer_init(void) |
e4421fec | 3187 | { |
d88aee68 | 3188 | consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
282dadbc MD |
3189 | if (!consumer_data.channel_ht) { |
3190 | goto error; | |
3191 | } | |
3192 | ||
d88aee68 | 3193 | consumer_data.relayd_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
282dadbc MD |
3194 | if (!consumer_data.relayd_ht) { |
3195 | goto error; | |
3196 | } | |
3197 | ||
d88aee68 | 3198 | consumer_data.stream_list_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
282dadbc MD |
3199 | if (!consumer_data.stream_list_ht) { |
3200 | goto error; | |
3201 | } | |
3202 | ||
d8ef542d | 3203 | consumer_data.stream_per_chan_id_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
282dadbc MD |
3204 | if (!consumer_data.stream_per_chan_id_ht) { |
3205 | goto error; | |
3206 | } | |
3207 | ||
3208 | data_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); | |
3209 | if (!data_ht) { | |
3210 | goto error; | |
3211 | } | |
3212 | ||
3213 | metadata_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); | |
3214 | if (!metadata_ht) { | |
3215 | goto error; | |
3216 | } | |
3217 | ||
3218 | return 0; | |
3219 | ||
3220 | error: | |
3221 | return -1; | |
e4421fec | 3222 | } |
7735ef9e DG |
3223 | |
3224 | /* | |
3225 | * Process the ADD_RELAYD command receive by a consumer. | |
3226 | * | |
3227 | * This will create a relayd socket pair and add it to the relayd hash table. | |
3228 | * The caller MUST acquire a RCU read side lock before calling it. | |
3229 | */ | |
da009f2c | 3230 | int consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type, |
7735ef9e | 3231 | struct lttng_consumer_local_data *ctx, int sock, |
6151a90f | 3232 | struct pollfd *consumer_sockpoll, |
d3e2ba59 JD |
3233 | struct lttcomm_relayd_sock *relayd_sock, uint64_t sessiond_id, |
3234 | uint64_t relayd_session_id) | |
7735ef9e | 3235 | { |
cd2b09ed | 3236 | int fd = -1, ret = -1, relayd_created = 0; |
0c759fc9 | 3237 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
d4298c99 | 3238 | struct consumer_relayd_sock_pair *relayd = NULL; |
7735ef9e | 3239 | |
6151a90f JD |
3240 | assert(ctx); |
3241 | assert(relayd_sock); | |
3242 | ||
da009f2c | 3243 | DBG("Consumer adding relayd socket (idx: %" PRIu64 ")", net_seq_idx); |
7735ef9e DG |
3244 | |
3245 | /* Get relayd reference if exists. */ | |
3246 | relayd = consumer_find_relayd(net_seq_idx); | |
3247 | if (relayd == NULL) { | |
da009f2c | 3248 | assert(sock_type == LTTNG_STREAM_CONTROL); |
7735ef9e DG |
3249 | /* Not found. Allocate one. */ |
3250 | relayd = consumer_allocate_relayd_sock_pair(net_seq_idx); | |
3251 | if (relayd == NULL) { | |
0d08d75e | 3252 | ret = -ENOMEM; |
618a6a28 MD |
3253 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; |
3254 | goto error; | |
0d08d75e | 3255 | } else { |
30319bcb | 3256 | relayd->sessiond_session_id = sessiond_id; |
0d08d75e | 3257 | relayd_created = 1; |
7735ef9e | 3258 | } |
0d08d75e DG |
3259 | |
3260 | /* | |
3261 | * This code path MUST continue to the consumer send status message to | |
3262 | * we can notify the session daemon and continue our work without | |
3263 | * killing everything. | |
3264 | */ | |
da009f2c MD |
3265 | } else { |
3266 | /* | |
3267 | * relayd key should never be found for control socket. | |
3268 | */ | |
3269 | assert(sock_type != LTTNG_STREAM_CONTROL); | |
0d08d75e DG |
3270 | } |
3271 | ||
3272 | /* First send a status message before receiving the fds. */ | |
0c759fc9 | 3273 | ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS); |
618a6a28 | 3274 | if (ret < 0) { |
0d08d75e | 3275 | /* Somehow, the session daemon is not responding anymore. */ |
618a6a28 MD |
3276 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL); |
3277 | goto error_nosignal; | |
7735ef9e DG |
3278 | } |
3279 | ||
3280 | /* Poll on consumer socket. */ | |
3281 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
0d08d75e | 3282 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
7735ef9e | 3283 | ret = -EINTR; |
618a6a28 | 3284 | goto error_nosignal; |
7735ef9e DG |
3285 | } |
3286 | ||
3287 | /* Get relayd socket from session daemon */ | |
3288 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); | |
3289 | if (ret != sizeof(fd)) { | |
7735ef9e | 3290 | ret = -1; |
4028eeb9 | 3291 | fd = -1; /* Just in case it gets set with an invalid value. */ |
0d08d75e DG |
3292 | |
3293 | /* | |
3294 | * Failing to receive FDs might indicate a major problem such as | |
3295 | * reaching a fd limit during the receive where the kernel returns a | |
3296 | * MSG_CTRUNC and fails to cleanup the fd in the queue. Any case, we | |
3297 | * don't take any chances and stop everything. | |
3298 | * | |
3299 | * XXX: Feature request #558 will fix that and avoid this possible | |
3300 | * issue when reaching the fd limit. | |
3301 | */ | |
3302 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); | |
618a6a28 | 3303 | ret_code = LTTCOMM_CONSUMERD_ERROR_RECV_FD; |
f50f23d9 DG |
3304 | goto error; |
3305 | } | |
3306 | ||
7735ef9e DG |
3307 | /* Copy socket information and received FD */ |
3308 | switch (sock_type) { | |
3309 | case LTTNG_STREAM_CONTROL: | |
3310 | /* Copy received lttcomm socket */ | |
6151a90f JD |
3311 | lttcomm_copy_sock(&relayd->control_sock.sock, &relayd_sock->sock); |
3312 | ret = lttcomm_create_sock(&relayd->control_sock.sock); | |
4028eeb9 | 3313 | /* Handle create_sock error. */ |
f66c074c | 3314 | if (ret < 0) { |
618a6a28 | 3315 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; |
4028eeb9 | 3316 | goto error; |
f66c074c | 3317 | } |
da009f2c MD |
3318 | /* |
3319 | * Close the socket created internally by | |
3320 | * lttcomm_create_sock, so we can replace it by the one | |
3321 | * received from sessiond. | |
3322 | */ | |
3323 | if (close(relayd->control_sock.sock.fd)) { | |
3324 | PERROR("close"); | |
3325 | } | |
7735ef9e DG |
3326 | |
3327 | /* Assign new file descriptor */ | |
6151a90f | 3328 | relayd->control_sock.sock.fd = fd; |
4b29f1ce | 3329 | fd = -1; /* For error path */ |
6151a90f JD |
3330 | /* Assign version values. */ |
3331 | relayd->control_sock.major = relayd_sock->major; | |
3332 | relayd->control_sock.minor = relayd_sock->minor; | |
c5b6f4f0 | 3333 | |
d3e2ba59 | 3334 | relayd->relayd_session_id = relayd_session_id; |
c5b6f4f0 | 3335 | |
7735ef9e DG |
3336 | break; |
3337 | case LTTNG_STREAM_DATA: | |
3338 | /* Copy received lttcomm socket */ | |
6151a90f JD |
3339 | lttcomm_copy_sock(&relayd->data_sock.sock, &relayd_sock->sock); |
3340 | ret = lttcomm_create_sock(&relayd->data_sock.sock); | |
4028eeb9 | 3341 | /* Handle create_sock error. */ |
f66c074c | 3342 | if (ret < 0) { |
618a6a28 | 3343 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; |
4028eeb9 | 3344 | goto error; |
f66c074c | 3345 | } |
da009f2c MD |
3346 | /* |
3347 | * Close the socket created internally by | |
3348 | * lttcomm_create_sock, so we can replace it by the one | |
3349 | * received from sessiond. | |
3350 | */ | |
3351 | if (close(relayd->data_sock.sock.fd)) { | |
3352 | PERROR("close"); | |
3353 | } | |
7735ef9e DG |
3354 | |
3355 | /* Assign new file descriptor */ | |
6151a90f | 3356 | relayd->data_sock.sock.fd = fd; |
4b29f1ce | 3357 | fd = -1; /* for eventual error paths */ |
6151a90f JD |
3358 | /* Assign version values. */ |
3359 | relayd->data_sock.major = relayd_sock->major; | |
3360 | relayd->data_sock.minor = relayd_sock->minor; | |
7735ef9e DG |
3361 | break; |
3362 | default: | |
3363 | ERR("Unknown relayd socket type (%d)", sock_type); | |
59e71485 | 3364 | ret = -1; |
618a6a28 | 3365 | ret_code = LTTCOMM_CONSUMERD_FATAL; |
7735ef9e DG |
3366 | goto error; |
3367 | } | |
3368 | ||
d88aee68 | 3369 | DBG("Consumer %s socket created successfully with net idx %" PRIu64 " (fd: %d)", |
7735ef9e DG |
3370 | sock_type == LTTNG_STREAM_CONTROL ? "control" : "data", |
3371 | relayd->net_seq_idx, fd); | |
3372 | ||
618a6a28 MD |
3373 | /* We successfully added the socket. Send status back. */ |
3374 | ret = consumer_send_status_msg(sock, ret_code); | |
3375 | if (ret < 0) { | |
3376 | /* Somehow, the session daemon is not responding anymore. */ | |
3377 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL); | |
3378 | goto error_nosignal; | |
3379 | } | |
3380 | ||
7735ef9e DG |
3381 | /* |
3382 | * Add relayd socket pair to consumer data hashtable. If object already | |
3383 | * exists or on error, the function gracefully returns. | |
3384 | */ | |
d09e1200 | 3385 | add_relayd(relayd); |
7735ef9e DG |
3386 | |
3387 | /* All good! */ | |
4028eeb9 | 3388 | return 0; |
7735ef9e DG |
3389 | |
3390 | error: | |
618a6a28 MD |
3391 | if (consumer_send_status_msg(sock, ret_code) < 0) { |
3392 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL); | |
3393 | } | |
3394 | ||
3395 | error_nosignal: | |
4028eeb9 DG |
3396 | /* Close received socket if valid. */ |
3397 | if (fd >= 0) { | |
3398 | if (close(fd)) { | |
3399 | PERROR("close received socket"); | |
3400 | } | |
3401 | } | |
cd2b09ed DG |
3402 | |
3403 | if (relayd_created) { | |
cd2b09ed DG |
3404 | free(relayd); |
3405 | } | |
3406 | ||
7735ef9e DG |
3407 | return ret; |
3408 | } | |
ca22feea | 3409 | |
4e9a4686 DG |
3410 | /* |
3411 | * Try to lock the stream mutex. | |
3412 | * | |
3413 | * On success, 1 is returned else 0 indicating that the mutex is NOT lock. | |
3414 | */ | |
3415 | static int stream_try_lock(struct lttng_consumer_stream *stream) | |
3416 | { | |
3417 | int ret; | |
3418 | ||
3419 | assert(stream); | |
3420 | ||
3421 | /* | |
3422 | * Try to lock the stream mutex. On failure, we know that the stream is | |
3423 | * being used else where hence there is data still being extracted. | |
3424 | */ | |
3425 | ret = pthread_mutex_trylock(&stream->lock); | |
3426 | if (ret) { | |
3427 | /* For both EBUSY and EINVAL error, the mutex is NOT locked. */ | |
3428 | ret = 0; | |
3429 | goto end; | |
3430 | } | |
3431 | ||
3432 | ret = 1; | |
3433 | ||
3434 | end: | |
3435 | return ret; | |
3436 | } | |
3437 | ||
f7079f67 DG |
3438 | /* |
3439 | * Search for a relayd associated to the session id and return the reference. | |
3440 | * | |
3441 | * A rcu read side lock MUST be acquire before calling this function and locked | |
3442 | * until the relayd object is no longer necessary. | |
3443 | */ | |
3444 | static struct consumer_relayd_sock_pair *find_relayd_by_session_id(uint64_t id) | |
3445 | { | |
3446 | struct lttng_ht_iter iter; | |
f7079f67 | 3447 | struct consumer_relayd_sock_pair *relayd = NULL; |
f7079f67 DG |
3448 | |
3449 | /* Iterate over all relayd since they are indexed by net_seq_idx. */ | |
3450 | cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd, | |
3451 | node.node) { | |
18261bd1 DG |
3452 | /* |
3453 | * Check by sessiond id which is unique here where the relayd session | |
3454 | * id might not be when having multiple relayd. | |
3455 | */ | |
3456 | if (relayd->sessiond_session_id == id) { | |
f7079f67 | 3457 | /* Found the relayd. There can be only one per id. */ |
18261bd1 | 3458 | goto found; |
f7079f67 DG |
3459 | } |
3460 | } | |
3461 | ||
18261bd1 DG |
3462 | return NULL; |
3463 | ||
3464 | found: | |
f7079f67 DG |
3465 | return relayd; |
3466 | } | |
3467 | ||
ca22feea DG |
3468 | /* |
3469 | * Check if for a given session id there is still data needed to be extract | |
3470 | * from the buffers. | |
3471 | * | |
6d805429 | 3472 | * Return 1 if data is pending or else 0 meaning ready to be read. |
ca22feea | 3473 | */ |
6d805429 | 3474 | int consumer_data_pending(uint64_t id) |
ca22feea DG |
3475 | { |
3476 | int ret; | |
3477 | struct lttng_ht_iter iter; | |
3478 | struct lttng_ht *ht; | |
3479 | struct lttng_consumer_stream *stream; | |
f7079f67 | 3480 | struct consumer_relayd_sock_pair *relayd = NULL; |
6d805429 | 3481 | int (*data_pending)(struct lttng_consumer_stream *); |
ca22feea | 3482 | |
6d805429 | 3483 | DBG("Consumer data pending command on session id %" PRIu64, id); |
ca22feea | 3484 | |
6f6eda74 | 3485 | rcu_read_lock(); |
ca22feea DG |
3486 | pthread_mutex_lock(&consumer_data.lock); |
3487 | ||
3488 | switch (consumer_data.type) { | |
3489 | case LTTNG_CONSUMER_KERNEL: | |
6d805429 | 3490 | data_pending = lttng_kconsumer_data_pending; |
ca22feea DG |
3491 | break; |
3492 | case LTTNG_CONSUMER32_UST: | |
3493 | case LTTNG_CONSUMER64_UST: | |
6d805429 | 3494 | data_pending = lttng_ustconsumer_data_pending; |
ca22feea DG |
3495 | break; |
3496 | default: | |
3497 | ERR("Unknown consumer data type"); | |
3498 | assert(0); | |
3499 | } | |
3500 | ||
3501 | /* Ease our life a bit */ | |
3502 | ht = consumer_data.stream_list_ht; | |
3503 | ||
f7079f67 DG |
3504 | relayd = find_relayd_by_session_id(id); |
3505 | if (relayd) { | |
3506 | /* Send init command for data pending. */ | |
3507 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
3508 | ret = relayd_begin_data_pending(&relayd->control_sock, | |
3509 | relayd->relayd_session_id); | |
3510 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
3511 | if (ret < 0) { | |
3512 | /* Communication error thus the relayd so no data pending. */ | |
3513 | goto data_not_pending; | |
3514 | } | |
3515 | } | |
3516 | ||
c8f59ee5 | 3517 | cds_lfht_for_each_entry_duplicate(ht->ht, |
d88aee68 DG |
3518 | ht->hash_fct(&id, lttng_ht_seed), |
3519 | ht->match_fct, &id, | |
ca22feea | 3520 | &iter.iter, stream, node_session_id.node) { |
4e9a4686 DG |
3521 | /* If this call fails, the stream is being used hence data pending. */ |
3522 | ret = stream_try_lock(stream); | |
3523 | if (!ret) { | |
f7079f67 | 3524 | goto data_pending; |
ca22feea | 3525 | } |
ca22feea | 3526 | |
4e9a4686 DG |
3527 | /* |
3528 | * A removed node from the hash table indicates that the stream has | |
3529 | * been deleted thus having a guarantee that the buffers are closed | |
3530 | * on the consumer side. However, data can still be transmitted | |
3531 | * over the network so don't skip the relayd check. | |
3532 | */ | |
3533 | ret = cds_lfht_is_node_deleted(&stream->node.node); | |
3534 | if (!ret) { | |
e5d1a9b3 MD |
3535 | /* |
3536 | * An empty output file is not valid. We need at least one packet | |
3537 | * generated per stream, even if it contains no event, so it | |
3538 | * contains at least one packet header. | |
3539 | */ | |
3540 | if (stream->output_written == 0) { | |
3541 | pthread_mutex_unlock(&stream->lock); | |
3542 | goto data_pending; | |
3543 | } | |
4e9a4686 | 3544 | /* Check the stream if there is data in the buffers. */ |
6d805429 DG |
3545 | ret = data_pending(stream); |
3546 | if (ret == 1) { | |
4e9a4686 | 3547 | pthread_mutex_unlock(&stream->lock); |
f7079f67 | 3548 | goto data_pending; |
4e9a4686 DG |
3549 | } |
3550 | } | |
3551 | ||
3552 | /* Relayd check */ | |
f7079f67 | 3553 | if (relayd) { |
c8f59ee5 DG |
3554 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); |
3555 | if (stream->metadata_flag) { | |
ad7051c0 DG |
3556 | ret = relayd_quiescent_control(&relayd->control_sock, |
3557 | stream->relayd_stream_id); | |
c8f59ee5 | 3558 | } else { |
6d805429 | 3559 | ret = relayd_data_pending(&relayd->control_sock, |
39df6d9f DG |
3560 | stream->relayd_stream_id, |
3561 | stream->next_net_seq_num - 1); | |
c8f59ee5 DG |
3562 | } |
3563 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
6d805429 | 3564 | if (ret == 1) { |
4e9a4686 | 3565 | pthread_mutex_unlock(&stream->lock); |
f7079f67 | 3566 | goto data_pending; |
c8f59ee5 DG |
3567 | } |
3568 | } | |
4e9a4686 | 3569 | pthread_mutex_unlock(&stream->lock); |
c8f59ee5 | 3570 | } |
ca22feea | 3571 | |
f7079f67 DG |
3572 | if (relayd) { |
3573 | unsigned int is_data_inflight = 0; | |
3574 | ||
3575 | /* Send init command for data pending. */ | |
3576 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
3577 | ret = relayd_end_data_pending(&relayd->control_sock, | |
3578 | relayd->relayd_session_id, &is_data_inflight); | |
3579 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
bdd88757 | 3580 | if (ret < 0) { |
f7079f67 DG |
3581 | goto data_not_pending; |
3582 | } | |
bdd88757 DG |
3583 | if (is_data_inflight) { |
3584 | goto data_pending; | |
3585 | } | |
f7079f67 DG |
3586 | } |
3587 | ||
ca22feea | 3588 | /* |
f7079f67 DG |
3589 | * Finding _no_ node in the hash table and no inflight data means that the |
3590 | * stream(s) have been removed thus data is guaranteed to be available for | |
3591 | * analysis from the trace files. | |
ca22feea DG |
3592 | */ |
3593 | ||
f7079f67 | 3594 | data_not_pending: |
ca22feea DG |
3595 | /* Data is available to be read by a viewer. */ |
3596 | pthread_mutex_unlock(&consumer_data.lock); | |
c8f59ee5 | 3597 | rcu_read_unlock(); |
6d805429 | 3598 | return 0; |
ca22feea | 3599 | |
f7079f67 | 3600 | data_pending: |
ca22feea DG |
3601 | /* Data is still being extracted from buffers. */ |
3602 | pthread_mutex_unlock(&consumer_data.lock); | |
c8f59ee5 | 3603 | rcu_read_unlock(); |
6d805429 | 3604 | return 1; |
ca22feea | 3605 | } |
f50f23d9 DG |
3606 | |
3607 | /* | |
3608 | * Send a ret code status message to the sessiond daemon. | |
3609 | * | |
3610 | * Return the sendmsg() return value. | |
3611 | */ | |
3612 | int consumer_send_status_msg(int sock, int ret_code) | |
3613 | { | |
3614 | struct lttcomm_consumer_status_msg msg; | |
3615 | ||
3616 | msg.ret_code = ret_code; | |
3617 | ||
3618 | return lttcomm_send_unix_sock(sock, &msg, sizeof(msg)); | |
3619 | } | |
ffe60014 DG |
3620 | |
3621 | /* | |
3622 | * Send a channel status message to the sessiond daemon. | |
3623 | * | |
3624 | * Return the sendmsg() return value. | |
3625 | */ | |
3626 | int consumer_send_status_channel(int sock, | |
3627 | struct lttng_consumer_channel *channel) | |
3628 | { | |
3629 | struct lttcomm_consumer_status_channel msg; | |
3630 | ||
3631 | assert(sock >= 0); | |
3632 | ||
3633 | if (!channel) { | |
0c759fc9 | 3634 | msg.ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; |
ffe60014 | 3635 | } else { |
0c759fc9 | 3636 | msg.ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
ffe60014 DG |
3637 | msg.key = channel->key; |
3638 | msg.stream_count = channel->streams.count; | |
3639 | } | |
3640 | ||
3641 | return lttcomm_send_unix_sock(sock, &msg, sizeof(msg)); | |
3642 | } | |
5c786ded JD |
3643 | |
3644 | /* | |
3645 | * Using a maximum stream size with the produced and consumed position of a | |
3646 | * stream, computes the new consumed position to be as close as possible to the | |
3647 | * maximum possible stream size. | |
3648 | * | |
3649 | * If maximum stream size is lower than the possible buffer size (produced - | |
3650 | * consumed), the consumed_pos given is returned untouched else the new value | |
3651 | * is returned. | |
3652 | */ | |
3653 | unsigned long consumer_get_consumed_maxsize(unsigned long consumed_pos, | |
3654 | unsigned long produced_pos, uint64_t max_stream_size) | |
3655 | { | |
3656 | if (max_stream_size && max_stream_size < (produced_pos - consumed_pos)) { | |
3657 | /* Offset from the produced position to get the latest buffers. */ | |
3658 | return produced_pos - max_stream_size; | |
3659 | } | |
3660 | ||
3661 | return consumed_pos; | |
3662 | } |