Commit | Line | Data |
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3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
00e2e675 | 4 | * 2012 - David Goulet <dgoulet@efficios.com> |
3bd1e081 | 5 | * |
d14d33bf AM |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License, version 2 only, | |
8 | * as published by the Free Software Foundation. | |
3bd1e081 | 9 | * |
d14d33bf AM |
10 | * This program is distributed in the hope that it will be useful, but WITHOUT |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
3bd1e081 | 14 | * |
d14d33bf AM |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
3bd1e081 MD |
18 | */ |
19 | ||
6c1c0768 | 20 | #define _LGPL_SOURCE |
3bd1e081 | 21 | #include <assert.h> |
3bd1e081 MD |
22 | #include <poll.h> |
23 | #include <pthread.h> | |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | #include <sys/mman.h> | |
27 | #include <sys/socket.h> | |
28 | #include <sys/types.h> | |
29 | #include <unistd.h> | |
77c7c900 | 30 | #include <inttypes.h> |
331744e3 | 31 | #include <signal.h> |
3bd1e081 | 32 | |
51a9e1c7 | 33 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 34 | #include <common/common.h> |
fb3a43a9 DG |
35 | #include <common/utils.h> |
36 | #include <common/compat/poll.h> | |
f263b7fd | 37 | #include <common/compat/endian.h> |
309167d2 | 38 | #include <common/index/index.h> |
10a8a223 | 39 | #include <common/kernel-ctl/kernel-ctl.h> |
00e2e675 | 40 | #include <common/sessiond-comm/relayd.h> |
10a8a223 DG |
41 | #include <common/sessiond-comm/sessiond-comm.h> |
42 | #include <common/kernel-consumer/kernel-consumer.h> | |
00e2e675 | 43 | #include <common/relayd/relayd.h> |
10a8a223 | 44 | #include <common/ust-consumer/ust-consumer.h> |
c8fea79c JR |
45 | #include <common/consumer/consumer-timer.h> |
46 | #include <common/consumer/consumer.h> | |
47 | #include <common/consumer/consumer-stream.h> | |
48 | #include <common/consumer/consumer-testpoint.h> | |
49 | #include <common/align.h> | |
5feafd41 | 50 | #include <common/consumer/consumer-metadata-cache.h> |
3bd1e081 MD |
51 | |
52 | struct lttng_consumer_global_data consumer_data = { | |
3bd1e081 MD |
53 | .stream_count = 0, |
54 | .need_update = 1, | |
55 | .type = LTTNG_CONSUMER_UNKNOWN, | |
56 | }; | |
57 | ||
d8ef542d MD |
58 | enum consumer_channel_action { |
59 | CONSUMER_CHANNEL_ADD, | |
a0cbdd2e | 60 | CONSUMER_CHANNEL_DEL, |
d8ef542d MD |
61 | CONSUMER_CHANNEL_QUIT, |
62 | }; | |
63 | ||
64 | struct consumer_channel_msg { | |
65 | enum consumer_channel_action action; | |
a0cbdd2e MD |
66 | struct lttng_consumer_channel *chan; /* add */ |
67 | uint64_t key; /* del */ | |
d8ef542d MD |
68 | }; |
69 | ||
80957876 | 70 | /* Flag used to temporarily pause data consumption from testpoints. */ |
cf0bcb51 JG |
71 | int data_consumption_paused; |
72 | ||
3bd1e081 MD |
73 | /* |
74 | * Flag to inform the polling thread to quit when all fd hung up. Updated by | |
75 | * the consumer_thread_receive_fds when it notices that all fds has hung up. | |
76 | * Also updated by the signal handler (consumer_should_exit()). Read by the | |
77 | * polling threads. | |
78 | */ | |
10211f5c | 79 | int consumer_quit; |
3bd1e081 | 80 | |
43c34bc3 | 81 | /* |
43c34bc3 DG |
82 | * Global hash table containing respectively metadata and data streams. The |
83 | * stream element in this ht should only be updated by the metadata poll thread | |
84 | * for the metadata and the data poll thread for the data. | |
85 | */ | |
40dc48e0 DG |
86 | static struct lttng_ht *metadata_ht; |
87 | static struct lttng_ht *data_ht; | |
43c34bc3 | 88 | |
acdb9057 DG |
89 | /* |
90 | * Notify a thread lttng pipe to poll back again. This usually means that some | |
91 | * global state has changed so we just send back the thread in a poll wait | |
92 | * call. | |
93 | */ | |
94 | static void notify_thread_lttng_pipe(struct lttng_pipe *pipe) | |
95 | { | |
96 | struct lttng_consumer_stream *null_stream = NULL; | |
97 | ||
98 | assert(pipe); | |
99 | ||
100 | (void) lttng_pipe_write(pipe, &null_stream, sizeof(null_stream)); | |
101 | } | |
102 | ||
5c635c72 MD |
103 | static void notify_health_quit_pipe(int *pipe) |
104 | { | |
6cd525e8 | 105 | ssize_t ret; |
5c635c72 | 106 | |
6cd525e8 MD |
107 | ret = lttng_write(pipe[1], "4", 1); |
108 | if (ret < 1) { | |
5c635c72 MD |
109 | PERROR("write consumer health quit"); |
110 | } | |
111 | } | |
112 | ||
d8ef542d MD |
113 | static void notify_channel_pipe(struct lttng_consumer_local_data *ctx, |
114 | struct lttng_consumer_channel *chan, | |
a0cbdd2e | 115 | uint64_t key, |
d8ef542d MD |
116 | enum consumer_channel_action action) |
117 | { | |
118 | struct consumer_channel_msg msg; | |
6cd525e8 | 119 | ssize_t ret; |
d8ef542d | 120 | |
e56251fc DG |
121 | memset(&msg, 0, sizeof(msg)); |
122 | ||
d8ef542d MD |
123 | msg.action = action; |
124 | msg.chan = chan; | |
f21dae48 | 125 | msg.key = key; |
6cd525e8 MD |
126 | ret = lttng_write(ctx->consumer_channel_pipe[1], &msg, sizeof(msg)); |
127 | if (ret < sizeof(msg)) { | |
128 | PERROR("notify_channel_pipe write error"); | |
129 | } | |
d8ef542d MD |
130 | } |
131 | ||
a0cbdd2e MD |
132 | void notify_thread_del_channel(struct lttng_consumer_local_data *ctx, |
133 | uint64_t key) | |
134 | { | |
135 | notify_channel_pipe(ctx, NULL, key, CONSUMER_CHANNEL_DEL); | |
136 | } | |
137 | ||
d8ef542d MD |
138 | static int read_channel_pipe(struct lttng_consumer_local_data *ctx, |
139 | struct lttng_consumer_channel **chan, | |
a0cbdd2e | 140 | uint64_t *key, |
d8ef542d MD |
141 | enum consumer_channel_action *action) |
142 | { | |
143 | struct consumer_channel_msg msg; | |
6cd525e8 | 144 | ssize_t ret; |
d8ef542d | 145 | |
6cd525e8 MD |
146 | ret = lttng_read(ctx->consumer_channel_pipe[0], &msg, sizeof(msg)); |
147 | if (ret < sizeof(msg)) { | |
148 | ret = -1; | |
149 | goto error; | |
d8ef542d | 150 | } |
6cd525e8 MD |
151 | *action = msg.action; |
152 | *chan = msg.chan; | |
153 | *key = msg.key; | |
154 | error: | |
155 | return (int) ret; | |
d8ef542d MD |
156 | } |
157 | ||
212d67a2 DG |
158 | /* |
159 | * Cleanup the stream list of a channel. Those streams are not yet globally | |
160 | * visible | |
161 | */ | |
162 | static void clean_channel_stream_list(struct lttng_consumer_channel *channel) | |
163 | { | |
164 | struct lttng_consumer_stream *stream, *stmp; | |
165 | ||
166 | assert(channel); | |
167 | ||
168 | /* Delete streams that might have been left in the stream list. */ | |
169 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
170 | send_node) { | |
171 | cds_list_del(&stream->send_node); | |
172 | /* | |
173 | * Once a stream is added to this list, the buffers were created so we | |
174 | * have a guarantee that this call will succeed. Setting the monitor | |
175 | * mode to 0 so we don't lock nor try to delete the stream from the | |
176 | * global hash table. | |
177 | */ | |
178 | stream->monitor = 0; | |
179 | consumer_stream_destroy(stream, NULL); | |
180 | } | |
181 | } | |
182 | ||
3bd1e081 MD |
183 | /* |
184 | * Find a stream. The consumer_data.lock must be locked during this | |
185 | * call. | |
186 | */ | |
d88aee68 | 187 | static struct lttng_consumer_stream *find_stream(uint64_t key, |
8389e4f8 | 188 | struct lttng_ht *ht) |
3bd1e081 | 189 | { |
e4421fec | 190 | struct lttng_ht_iter iter; |
d88aee68 | 191 | struct lttng_ht_node_u64 *node; |
e4421fec | 192 | struct lttng_consumer_stream *stream = NULL; |
3bd1e081 | 193 | |
8389e4f8 DG |
194 | assert(ht); |
195 | ||
d88aee68 DG |
196 | /* -1ULL keys are lookup failures */ |
197 | if (key == (uint64_t) -1ULL) { | |
7ad0a0cb | 198 | return NULL; |
7a57cf92 | 199 | } |
e4421fec | 200 | |
6065ceec DG |
201 | rcu_read_lock(); |
202 | ||
d88aee68 DG |
203 | lttng_ht_lookup(ht, &key, &iter); |
204 | node = lttng_ht_iter_get_node_u64(&iter); | |
e4421fec DG |
205 | if (node != NULL) { |
206 | stream = caa_container_of(node, struct lttng_consumer_stream, node); | |
3bd1e081 | 207 | } |
e4421fec | 208 | |
6065ceec DG |
209 | rcu_read_unlock(); |
210 | ||
e4421fec | 211 | return stream; |
3bd1e081 MD |
212 | } |
213 | ||
da009f2c | 214 | static void steal_stream_key(uint64_t key, struct lttng_ht *ht) |
7ad0a0cb MD |
215 | { |
216 | struct lttng_consumer_stream *stream; | |
217 | ||
04253271 | 218 | rcu_read_lock(); |
ffe60014 | 219 | stream = find_stream(key, ht); |
04253271 | 220 | if (stream) { |
da009f2c | 221 | stream->key = (uint64_t) -1ULL; |
04253271 MD |
222 | /* |
223 | * We don't want the lookup to match, but we still need | |
224 | * to iterate on this stream when iterating over the hash table. Just | |
225 | * change the node key. | |
226 | */ | |
da009f2c | 227 | stream->node.key = (uint64_t) -1ULL; |
04253271 MD |
228 | } |
229 | rcu_read_unlock(); | |
7ad0a0cb MD |
230 | } |
231 | ||
d56db448 DG |
232 | /* |
233 | * Return a channel object for the given key. | |
234 | * | |
235 | * RCU read side lock MUST be acquired before calling this function and | |
236 | * protects the channel ptr. | |
237 | */ | |
d88aee68 | 238 | struct lttng_consumer_channel *consumer_find_channel(uint64_t key) |
3bd1e081 | 239 | { |
e4421fec | 240 | struct lttng_ht_iter iter; |
d88aee68 | 241 | struct lttng_ht_node_u64 *node; |
e4421fec | 242 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 | 243 | |
d88aee68 DG |
244 | /* -1ULL keys are lookup failures */ |
245 | if (key == (uint64_t) -1ULL) { | |
7ad0a0cb | 246 | return NULL; |
7a57cf92 | 247 | } |
e4421fec | 248 | |
d88aee68 DG |
249 | lttng_ht_lookup(consumer_data.channel_ht, &key, &iter); |
250 | node = lttng_ht_iter_get_node_u64(&iter); | |
e4421fec DG |
251 | if (node != NULL) { |
252 | channel = caa_container_of(node, struct lttng_consumer_channel, node); | |
3bd1e081 | 253 | } |
e4421fec DG |
254 | |
255 | return channel; | |
3bd1e081 MD |
256 | } |
257 | ||
b5a6470f DG |
258 | /* |
259 | * There is a possibility that the consumer does not have enough time between | |
260 | * the close of the channel on the session daemon and the cleanup in here thus | |
261 | * once we have a channel add with an existing key, we know for sure that this | |
262 | * channel will eventually get cleaned up by all streams being closed. | |
263 | * | |
264 | * This function just nullifies the already existing channel key. | |
265 | */ | |
266 | static void steal_channel_key(uint64_t key) | |
267 | { | |
268 | struct lttng_consumer_channel *channel; | |
269 | ||
270 | rcu_read_lock(); | |
271 | channel = consumer_find_channel(key); | |
272 | if (channel) { | |
273 | channel->key = (uint64_t) -1ULL; | |
274 | /* | |
275 | * We don't want the lookup to match, but we still need to iterate on | |
276 | * this channel when iterating over the hash table. Just change the | |
277 | * node key. | |
278 | */ | |
279 | channel->node.key = (uint64_t) -1ULL; | |
280 | } | |
281 | rcu_read_unlock(); | |
282 | } | |
283 | ||
ffe60014 | 284 | static void free_channel_rcu(struct rcu_head *head) |
702b1ea4 | 285 | { |
d88aee68 DG |
286 | struct lttng_ht_node_u64 *node = |
287 | caa_container_of(head, struct lttng_ht_node_u64, head); | |
ffe60014 DG |
288 | struct lttng_consumer_channel *channel = |
289 | caa_container_of(node, struct lttng_consumer_channel, node); | |
702b1ea4 | 290 | |
b83e03c4 MD |
291 | switch (consumer_data.type) { |
292 | case LTTNG_CONSUMER_KERNEL: | |
293 | break; | |
294 | case LTTNG_CONSUMER32_UST: | |
295 | case LTTNG_CONSUMER64_UST: | |
296 | lttng_ustconsumer_free_channel(channel); | |
297 | break; | |
298 | default: | |
299 | ERR("Unknown consumer_data type"); | |
300 | abort(); | |
301 | } | |
ffe60014 | 302 | free(channel); |
702b1ea4 MD |
303 | } |
304 | ||
00e2e675 DG |
305 | /* |
306 | * RCU protected relayd socket pair free. | |
307 | */ | |
ffe60014 | 308 | static void free_relayd_rcu(struct rcu_head *head) |
00e2e675 | 309 | { |
d88aee68 DG |
310 | struct lttng_ht_node_u64 *node = |
311 | caa_container_of(head, struct lttng_ht_node_u64, head); | |
00e2e675 DG |
312 | struct consumer_relayd_sock_pair *relayd = |
313 | caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
314 | ||
8994307f DG |
315 | /* |
316 | * Close all sockets. This is done in the call RCU since we don't want the | |
317 | * socket fds to be reassigned thus potentially creating bad state of the | |
318 | * relayd object. | |
319 | * | |
320 | * We do not have to lock the control socket mutex here since at this stage | |
321 | * there is no one referencing to this relayd object. | |
322 | */ | |
323 | (void) relayd_close(&relayd->control_sock); | |
324 | (void) relayd_close(&relayd->data_sock); | |
325 | ||
00e2e675 DG |
326 | free(relayd); |
327 | } | |
328 | ||
329 | /* | |
330 | * Destroy and free relayd socket pair object. | |
00e2e675 | 331 | */ |
51230d70 | 332 | void consumer_destroy_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
333 | { |
334 | int ret; | |
335 | struct lttng_ht_iter iter; | |
336 | ||
173af62f DG |
337 | if (relayd == NULL) { |
338 | return; | |
339 | } | |
340 | ||
00e2e675 DG |
341 | DBG("Consumer destroy and close relayd socket pair"); |
342 | ||
343 | iter.iter.node = &relayd->node.node; | |
344 | ret = lttng_ht_del(consumer_data.relayd_ht, &iter); | |
173af62f | 345 | if (ret != 0) { |
8994307f | 346 | /* We assume the relayd is being or is destroyed */ |
173af62f DG |
347 | return; |
348 | } | |
00e2e675 | 349 | |
00e2e675 | 350 | /* RCU free() call */ |
ffe60014 DG |
351 | call_rcu(&relayd->node.head, free_relayd_rcu); |
352 | } | |
353 | ||
354 | /* | |
355 | * Remove a channel from the global list protected by a mutex. This function is | |
356 | * also responsible for freeing its data structures. | |
357 | */ | |
358 | void consumer_del_channel(struct lttng_consumer_channel *channel) | |
359 | { | |
360 | int ret; | |
361 | struct lttng_ht_iter iter; | |
362 | ||
d88aee68 | 363 | DBG("Consumer delete channel key %" PRIu64, channel->key); |
ffe60014 DG |
364 | |
365 | pthread_mutex_lock(&consumer_data.lock); | |
a9838785 | 366 | pthread_mutex_lock(&channel->lock); |
ffe60014 | 367 | |
212d67a2 DG |
368 | /* Destroy streams that might have been left in the stream list. */ |
369 | clean_channel_stream_list(channel); | |
51e762e5 | 370 | |
d3e2ba59 JD |
371 | if (channel->live_timer_enabled == 1) { |
372 | consumer_timer_live_stop(channel); | |
373 | } | |
e9404c27 JG |
374 | if (channel->monitor_timer_enabled == 1) { |
375 | consumer_timer_monitor_stop(channel); | |
376 | } | |
d3e2ba59 | 377 | |
ffe60014 DG |
378 | switch (consumer_data.type) { |
379 | case LTTNG_CONSUMER_KERNEL: | |
380 | break; | |
381 | case LTTNG_CONSUMER32_UST: | |
382 | case LTTNG_CONSUMER64_UST: | |
383 | lttng_ustconsumer_del_channel(channel); | |
384 | break; | |
385 | default: | |
386 | ERR("Unknown consumer_data type"); | |
387 | assert(0); | |
388 | goto end; | |
389 | } | |
390 | ||
391 | rcu_read_lock(); | |
392 | iter.iter.node = &channel->node.node; | |
393 | ret = lttng_ht_del(consumer_data.channel_ht, &iter); | |
394 | assert(!ret); | |
395 | rcu_read_unlock(); | |
396 | ||
397 | call_rcu(&channel->node.head, free_channel_rcu); | |
398 | end: | |
a9838785 | 399 | pthread_mutex_unlock(&channel->lock); |
ffe60014 | 400 | pthread_mutex_unlock(&consumer_data.lock); |
00e2e675 DG |
401 | } |
402 | ||
228b5bf7 DG |
403 | /* |
404 | * Iterate over the relayd hash table and destroy each element. Finally, | |
405 | * destroy the whole hash table. | |
406 | */ | |
407 | static void cleanup_relayd_ht(void) | |
408 | { | |
409 | struct lttng_ht_iter iter; | |
410 | struct consumer_relayd_sock_pair *relayd; | |
411 | ||
412 | rcu_read_lock(); | |
413 | ||
414 | cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd, | |
415 | node.node) { | |
51230d70 | 416 | consumer_destroy_relayd(relayd); |
228b5bf7 DG |
417 | } |
418 | ||
228b5bf7 | 419 | rcu_read_unlock(); |
36b588ed MD |
420 | |
421 | lttng_ht_destroy(consumer_data.relayd_ht); | |
228b5bf7 DG |
422 | } |
423 | ||
8994307f DG |
424 | /* |
425 | * Update the end point status of all streams having the given network sequence | |
426 | * index (relayd index). | |
427 | * | |
428 | * It's atomically set without having the stream mutex locked which is fine | |
429 | * because we handle the write/read race with a pipe wakeup for each thread. | |
430 | */ | |
da009f2c | 431 | static void update_endpoint_status_by_netidx(uint64_t net_seq_idx, |
8994307f DG |
432 | enum consumer_endpoint_status status) |
433 | { | |
434 | struct lttng_ht_iter iter; | |
435 | struct lttng_consumer_stream *stream; | |
436 | ||
da009f2c | 437 | DBG("Consumer set delete flag on stream by idx %" PRIu64, net_seq_idx); |
8994307f DG |
438 | |
439 | rcu_read_lock(); | |
440 | ||
441 | /* Let's begin with metadata */ | |
442 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) { | |
443 | if (stream->net_seq_idx == net_seq_idx) { | |
444 | uatomic_set(&stream->endpoint_status, status); | |
445 | DBG("Delete flag set to metadata stream %d", stream->wait_fd); | |
446 | } | |
447 | } | |
448 | ||
449 | /* Follow up by the data streams */ | |
450 | cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) { | |
451 | if (stream->net_seq_idx == net_seq_idx) { | |
452 | uatomic_set(&stream->endpoint_status, status); | |
453 | DBG("Delete flag set to data stream %d", stream->wait_fd); | |
454 | } | |
455 | } | |
456 | rcu_read_unlock(); | |
457 | } | |
458 | ||
459 | /* | |
460 | * Cleanup a relayd object by flagging every associated streams for deletion, | |
461 | * destroying the object meaning removing it from the relayd hash table, | |
462 | * closing the sockets and freeing the memory in a RCU call. | |
463 | * | |
464 | * If a local data context is available, notify the threads that the streams' | |
465 | * state have changed. | |
466 | */ | |
467 | static void cleanup_relayd(struct consumer_relayd_sock_pair *relayd, | |
468 | struct lttng_consumer_local_data *ctx) | |
469 | { | |
da009f2c | 470 | uint64_t netidx; |
8994307f DG |
471 | |
472 | assert(relayd); | |
473 | ||
9617607b DG |
474 | DBG("Cleaning up relayd sockets"); |
475 | ||
8994307f DG |
476 | /* Save the net sequence index before destroying the object */ |
477 | netidx = relayd->net_seq_idx; | |
478 | ||
479 | /* | |
480 | * Delete the relayd from the relayd hash table, close the sockets and free | |
481 | * the object in a RCU call. | |
482 | */ | |
51230d70 | 483 | consumer_destroy_relayd(relayd); |
8994307f DG |
484 | |
485 | /* Set inactive endpoint to all streams */ | |
486 | update_endpoint_status_by_netidx(netidx, CONSUMER_ENDPOINT_INACTIVE); | |
487 | ||
488 | /* | |
489 | * With a local data context, notify the threads that the streams' state | |
490 | * have changed. The write() action on the pipe acts as an "implicit" | |
491 | * memory barrier ordering the updates of the end point status from the | |
492 | * read of this status which happens AFTER receiving this notify. | |
493 | */ | |
494 | if (ctx) { | |
acdb9057 | 495 | notify_thread_lttng_pipe(ctx->consumer_data_pipe); |
13886d2d | 496 | notify_thread_lttng_pipe(ctx->consumer_metadata_pipe); |
8994307f DG |
497 | } |
498 | } | |
499 | ||
a6ba4fe1 DG |
500 | /* |
501 | * Flag a relayd socket pair for destruction. Destroy it if the refcount | |
502 | * reaches zero. | |
503 | * | |
504 | * RCU read side lock MUST be aquired before calling this function. | |
505 | */ | |
506 | void consumer_flag_relayd_for_destroy(struct consumer_relayd_sock_pair *relayd) | |
507 | { | |
508 | assert(relayd); | |
509 | ||
510 | /* Set destroy flag for this object */ | |
511 | uatomic_set(&relayd->destroy_flag, 1); | |
512 | ||
513 | /* Destroy the relayd if refcount is 0 */ | |
514 | if (uatomic_read(&relayd->refcount) == 0) { | |
51230d70 | 515 | consumer_destroy_relayd(relayd); |
a6ba4fe1 DG |
516 | } |
517 | } | |
518 | ||
3bd1e081 | 519 | /* |
1d1a276c DG |
520 | * Completly destroy stream from every visiable data structure and the given |
521 | * hash table if one. | |
522 | * | |
523 | * One this call returns, the stream object is not longer usable nor visible. | |
3bd1e081 | 524 | */ |
e316aad5 DG |
525 | void consumer_del_stream(struct lttng_consumer_stream *stream, |
526 | struct lttng_ht *ht) | |
3bd1e081 | 527 | { |
1d1a276c | 528 | consumer_stream_destroy(stream, ht); |
3bd1e081 MD |
529 | } |
530 | ||
5ab66908 MD |
531 | /* |
532 | * XXX naming of del vs destroy is all mixed up. | |
533 | */ | |
534 | void consumer_del_stream_for_data(struct lttng_consumer_stream *stream) | |
535 | { | |
536 | consumer_stream_destroy(stream, data_ht); | |
537 | } | |
538 | ||
539 | void consumer_del_stream_for_metadata(struct lttng_consumer_stream *stream) | |
540 | { | |
541 | consumer_stream_destroy(stream, metadata_ht); | |
542 | } | |
543 | ||
d9a2e16e JD |
544 | void consumer_stream_update_channel_attributes( |
545 | struct lttng_consumer_stream *stream, | |
546 | struct lttng_consumer_channel *channel) | |
547 | { | |
548 | stream->channel_read_only_attributes.tracefile_size = | |
549 | channel->tracefile_size; | |
550 | memcpy(stream->channel_read_only_attributes.path, channel->pathname, | |
551 | sizeof(stream->channel_read_only_attributes.path)); | |
552 | } | |
553 | ||
d88aee68 DG |
554 | struct lttng_consumer_stream *consumer_allocate_stream(uint64_t channel_key, |
555 | uint64_t stream_key, | |
3bd1e081 | 556 | enum lttng_consumer_stream_state state, |
ffe60014 | 557 | const char *channel_name, |
6df2e2c9 | 558 | uid_t uid, |
00e2e675 | 559 | gid_t gid, |
57a269f2 | 560 | uint64_t relayd_id, |
53632229 | 561 | uint64_t session_id, |
ffe60014 DG |
562 | int cpu, |
563 | int *alloc_ret, | |
4891ece8 DG |
564 | enum consumer_channel_type type, |
565 | unsigned int monitor) | |
3bd1e081 | 566 | { |
ffe60014 | 567 | int ret; |
3bd1e081 | 568 | struct lttng_consumer_stream *stream; |
3bd1e081 | 569 | |
effcf122 | 570 | stream = zmalloc(sizeof(*stream)); |
3bd1e081 | 571 | if (stream == NULL) { |
7a57cf92 | 572 | PERROR("malloc struct lttng_consumer_stream"); |
ffe60014 | 573 | ret = -ENOMEM; |
7a57cf92 | 574 | goto end; |
3bd1e081 | 575 | } |
7a57cf92 | 576 | |
d56db448 DG |
577 | rcu_read_lock(); |
578 | ||
3bd1e081 | 579 | stream->key = stream_key; |
3bd1e081 MD |
580 | stream->out_fd = -1; |
581 | stream->out_fd_offset = 0; | |
e5d1a9b3 | 582 | stream->output_written = 0; |
3bd1e081 | 583 | stream->state = state; |
6df2e2c9 MD |
584 | stream->uid = uid; |
585 | stream->gid = gid; | |
ffe60014 | 586 | stream->net_seq_idx = relayd_id; |
53632229 | 587 | stream->session_id = session_id; |
4891ece8 | 588 | stream->monitor = monitor; |
774d490c | 589 | stream->endpoint_status = CONSUMER_ENDPOINT_ACTIVE; |
f8f3885c | 590 | stream->index_file = NULL; |
fb83fe64 | 591 | stream->last_sequence_number = -1ULL; |
53632229 | 592 | pthread_mutex_init(&stream->lock, NULL); |
c585821b | 593 | pthread_mutex_init(&stream->metadata_timer_lock, NULL); |
58b1f425 | 594 | |
ffe60014 DG |
595 | /* If channel is the metadata, flag this stream as metadata. */ |
596 | if (type == CONSUMER_CHANNEL_TYPE_METADATA) { | |
597 | stream->metadata_flag = 1; | |
598 | /* Metadata is flat out. */ | |
599 | strncpy(stream->name, DEFAULT_METADATA_NAME, sizeof(stream->name)); | |
94d49140 JD |
600 | /* Live rendez-vous point. */ |
601 | pthread_cond_init(&stream->metadata_rdv, NULL); | |
602 | pthread_mutex_init(&stream->metadata_rdv_lock, NULL); | |
58b1f425 | 603 | } else { |
ffe60014 DG |
604 | /* Format stream name to <channel_name>_<cpu_number> */ |
605 | ret = snprintf(stream->name, sizeof(stream->name), "%s_%d", | |
606 | channel_name, cpu); | |
607 | if (ret < 0) { | |
608 | PERROR("snprintf stream name"); | |
609 | goto error; | |
610 | } | |
58b1f425 | 611 | } |
c30aaa51 | 612 | |
ffe60014 | 613 | /* Key is always the wait_fd for streams. */ |
d88aee68 | 614 | lttng_ht_node_init_u64(&stream->node, stream->key); |
ffe60014 | 615 | |
d8ef542d MD |
616 | /* Init node per channel id key */ |
617 | lttng_ht_node_init_u64(&stream->node_channel_id, channel_key); | |
618 | ||
53632229 | 619 | /* Init session id node with the stream session id */ |
d88aee68 | 620 | lttng_ht_node_init_u64(&stream->node_session_id, stream->session_id); |
53632229 | 621 | |
07b86b52 JD |
622 | DBG3("Allocated stream %s (key %" PRIu64 ", chan_key %" PRIu64 |
623 | " relayd_id %" PRIu64 ", session_id %" PRIu64, | |
624 | stream->name, stream->key, channel_key, | |
625 | stream->net_seq_idx, stream->session_id); | |
d56db448 DG |
626 | |
627 | rcu_read_unlock(); | |
3bd1e081 | 628 | return stream; |
c80048c6 MD |
629 | |
630 | error: | |
d56db448 | 631 | rcu_read_unlock(); |
c80048c6 | 632 | free(stream); |
7a57cf92 | 633 | end: |
ffe60014 DG |
634 | if (alloc_ret) { |
635 | *alloc_ret = ret; | |
636 | } | |
c80048c6 | 637 | return NULL; |
3bd1e081 MD |
638 | } |
639 | ||
640 | /* | |
641 | * Add a stream to the global list protected by a mutex. | |
642 | */ | |
66d583dc | 643 | void consumer_add_data_stream(struct lttng_consumer_stream *stream) |
3bd1e081 | 644 | { |
5ab66908 | 645 | struct lttng_ht *ht = data_ht; |
3bd1e081 | 646 | |
e316aad5 | 647 | assert(stream); |
43c34bc3 | 648 | assert(ht); |
c77fc10a | 649 | |
d88aee68 | 650 | DBG3("Adding consumer stream %" PRIu64, stream->key); |
e316aad5 DG |
651 | |
652 | pthread_mutex_lock(&consumer_data.lock); | |
a9838785 | 653 | pthread_mutex_lock(&stream->chan->lock); |
ec6ea7d0 | 654 | pthread_mutex_lock(&stream->chan->timer_lock); |
2e818a6a | 655 | pthread_mutex_lock(&stream->lock); |
b0b335c8 | 656 | rcu_read_lock(); |
e316aad5 | 657 | |
43c34bc3 | 658 | /* Steal stream identifier to avoid having streams with the same key */ |
ffe60014 | 659 | steal_stream_key(stream->key, ht); |
43c34bc3 | 660 | |
d88aee68 | 661 | lttng_ht_add_unique_u64(ht, &stream->node); |
00e2e675 | 662 | |
d8ef542d MD |
663 | lttng_ht_add_u64(consumer_data.stream_per_chan_id_ht, |
664 | &stream->node_channel_id); | |
665 | ||
ca22feea DG |
666 | /* |
667 | * Add stream to the stream_list_ht of the consumer data. No need to steal | |
668 | * the key since the HT does not use it and we allow to add redundant keys | |
669 | * into this table. | |
670 | */ | |
d88aee68 | 671 | lttng_ht_add_u64(consumer_data.stream_list_ht, &stream->node_session_id); |
ca22feea | 672 | |
e316aad5 | 673 | /* |
ffe60014 DG |
674 | * When nb_init_stream_left reaches 0, we don't need to trigger any action |
675 | * in terms of destroying the associated channel, because the action that | |
e316aad5 DG |
676 | * causes the count to become 0 also causes a stream to be added. The |
677 | * channel deletion will thus be triggered by the following removal of this | |
678 | * stream. | |
679 | */ | |
ffe60014 | 680 | if (uatomic_read(&stream->chan->nb_init_stream_left) > 0) { |
f2ad556d MD |
681 | /* Increment refcount before decrementing nb_init_stream_left */ |
682 | cmm_smp_wmb(); | |
ffe60014 | 683 | uatomic_dec(&stream->chan->nb_init_stream_left); |
e316aad5 DG |
684 | } |
685 | ||
686 | /* Update consumer data once the node is inserted. */ | |
3bd1e081 MD |
687 | consumer_data.stream_count++; |
688 | consumer_data.need_update = 1; | |
689 | ||
e316aad5 | 690 | rcu_read_unlock(); |
2e818a6a | 691 | pthread_mutex_unlock(&stream->lock); |
ec6ea7d0 | 692 | pthread_mutex_unlock(&stream->chan->timer_lock); |
a9838785 | 693 | pthread_mutex_unlock(&stream->chan->lock); |
3bd1e081 | 694 | pthread_mutex_unlock(&consumer_data.lock); |
3bd1e081 MD |
695 | } |
696 | ||
5ab66908 MD |
697 | void consumer_del_data_stream(struct lttng_consumer_stream *stream) |
698 | { | |
699 | consumer_del_stream(stream, data_ht); | |
700 | } | |
701 | ||
00e2e675 | 702 | /* |
3f8e211f DG |
703 | * Add relayd socket to global consumer data hashtable. RCU read side lock MUST |
704 | * be acquired before calling this. | |
00e2e675 | 705 | */ |
d09e1200 | 706 | static int add_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
707 | { |
708 | int ret = 0; | |
d88aee68 | 709 | struct lttng_ht_node_u64 *node; |
00e2e675 DG |
710 | struct lttng_ht_iter iter; |
711 | ||
ffe60014 | 712 | assert(relayd); |
00e2e675 | 713 | |
00e2e675 | 714 | lttng_ht_lookup(consumer_data.relayd_ht, |
d88aee68 DG |
715 | &relayd->net_seq_idx, &iter); |
716 | node = lttng_ht_iter_get_node_u64(&iter); | |
00e2e675 | 717 | if (node != NULL) { |
00e2e675 DG |
718 | goto end; |
719 | } | |
d88aee68 | 720 | lttng_ht_add_unique_u64(consumer_data.relayd_ht, &relayd->node); |
00e2e675 | 721 | |
00e2e675 DG |
722 | end: |
723 | return ret; | |
724 | } | |
725 | ||
726 | /* | |
727 | * Allocate and return a consumer relayd socket. | |
728 | */ | |
027a694f | 729 | static struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair( |
da009f2c | 730 | uint64_t net_seq_idx) |
00e2e675 DG |
731 | { |
732 | struct consumer_relayd_sock_pair *obj = NULL; | |
733 | ||
da009f2c MD |
734 | /* net sequence index of -1 is a failure */ |
735 | if (net_seq_idx == (uint64_t) -1ULL) { | |
00e2e675 DG |
736 | goto error; |
737 | } | |
738 | ||
739 | obj = zmalloc(sizeof(struct consumer_relayd_sock_pair)); | |
740 | if (obj == NULL) { | |
741 | PERROR("zmalloc relayd sock"); | |
742 | goto error; | |
743 | } | |
744 | ||
745 | obj->net_seq_idx = net_seq_idx; | |
746 | obj->refcount = 0; | |
173af62f | 747 | obj->destroy_flag = 0; |
f96e4545 MD |
748 | obj->control_sock.sock.fd = -1; |
749 | obj->data_sock.sock.fd = -1; | |
d88aee68 | 750 | lttng_ht_node_init_u64(&obj->node, obj->net_seq_idx); |
00e2e675 DG |
751 | pthread_mutex_init(&obj->ctrl_sock_mutex, NULL); |
752 | ||
753 | error: | |
754 | return obj; | |
755 | } | |
756 | ||
757 | /* | |
758 | * Find a relayd socket pair in the global consumer data. | |
759 | * | |
760 | * Return the object if found else NULL. | |
b0b335c8 MD |
761 | * RCU read-side lock must be held across this call and while using the |
762 | * returned object. | |
00e2e675 | 763 | */ |
d88aee68 | 764 | struct consumer_relayd_sock_pair *consumer_find_relayd(uint64_t key) |
00e2e675 DG |
765 | { |
766 | struct lttng_ht_iter iter; | |
d88aee68 | 767 | struct lttng_ht_node_u64 *node; |
00e2e675 DG |
768 | struct consumer_relayd_sock_pair *relayd = NULL; |
769 | ||
770 | /* Negative keys are lookup failures */ | |
d88aee68 | 771 | if (key == (uint64_t) -1ULL) { |
00e2e675 DG |
772 | goto error; |
773 | } | |
774 | ||
d88aee68 | 775 | lttng_ht_lookup(consumer_data.relayd_ht, &key, |
00e2e675 | 776 | &iter); |
d88aee68 | 777 | node = lttng_ht_iter_get_node_u64(&iter); |
00e2e675 DG |
778 | if (node != NULL) { |
779 | relayd = caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
780 | } | |
781 | ||
00e2e675 DG |
782 | error: |
783 | return relayd; | |
784 | } | |
785 | ||
10a50311 JD |
786 | /* |
787 | * Find a relayd and send the stream | |
788 | * | |
789 | * Returns 0 on success, < 0 on error | |
790 | */ | |
791 | int consumer_send_relayd_stream(struct lttng_consumer_stream *stream, | |
792 | char *path) | |
793 | { | |
794 | int ret = 0; | |
795 | struct consumer_relayd_sock_pair *relayd; | |
796 | ||
797 | assert(stream); | |
798 | assert(stream->net_seq_idx != -1ULL); | |
799 | assert(path); | |
800 | ||
801 | /* The stream is not metadata. Get relayd reference if exists. */ | |
802 | rcu_read_lock(); | |
803 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
804 | if (relayd != NULL) { | |
805 | /* Add stream on the relayd */ | |
806 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
807 | ret = relayd_add_stream(&relayd->control_sock, stream->name, | |
808 | path, &stream->relayd_stream_id, | |
809 | stream->chan->tracefile_size, stream->chan->tracefile_count); | |
810 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
811 | if (ret < 0) { | |
812 | goto end; | |
813 | } | |
1c20f0e2 | 814 | |
10a50311 | 815 | uatomic_inc(&relayd->refcount); |
d01178b6 | 816 | stream->sent_to_relayd = 1; |
10a50311 JD |
817 | } else { |
818 | ERR("Stream %" PRIu64 " relayd ID %" PRIu64 " unknown. Can't send it.", | |
819 | stream->key, stream->net_seq_idx); | |
820 | ret = -1; | |
821 | goto end; | |
822 | } | |
823 | ||
824 | DBG("Stream %s with key %" PRIu64 " sent to relayd id %" PRIu64, | |
825 | stream->name, stream->key, stream->net_seq_idx); | |
826 | ||
827 | end: | |
828 | rcu_read_unlock(); | |
829 | return ret; | |
830 | } | |
831 | ||
a4baae1b JD |
832 | /* |
833 | * Find a relayd and send the streams sent message | |
834 | * | |
835 | * Returns 0 on success, < 0 on error | |
836 | */ | |
837 | int consumer_send_relayd_streams_sent(uint64_t net_seq_idx) | |
838 | { | |
839 | int ret = 0; | |
840 | struct consumer_relayd_sock_pair *relayd; | |
841 | ||
842 | assert(net_seq_idx != -1ULL); | |
843 | ||
844 | /* The stream is not metadata. Get relayd reference if exists. */ | |
845 | rcu_read_lock(); | |
846 | relayd = consumer_find_relayd(net_seq_idx); | |
847 | if (relayd != NULL) { | |
848 | /* Add stream on the relayd */ | |
849 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
850 | ret = relayd_streams_sent(&relayd->control_sock); | |
851 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
852 | if (ret < 0) { | |
853 | goto end; | |
854 | } | |
855 | } else { | |
856 | ERR("Relayd ID %" PRIu64 " unknown. Can't send streams_sent.", | |
857 | net_seq_idx); | |
858 | ret = -1; | |
859 | goto end; | |
860 | } | |
861 | ||
862 | ret = 0; | |
863 | DBG("All streams sent relayd id %" PRIu64, net_seq_idx); | |
864 | ||
865 | end: | |
866 | rcu_read_unlock(); | |
867 | return ret; | |
868 | } | |
869 | ||
10a50311 JD |
870 | /* |
871 | * Find a relayd and close the stream | |
872 | */ | |
873 | void close_relayd_stream(struct lttng_consumer_stream *stream) | |
874 | { | |
875 | struct consumer_relayd_sock_pair *relayd; | |
876 | ||
877 | /* The stream is not metadata. Get relayd reference if exists. */ | |
878 | rcu_read_lock(); | |
879 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
880 | if (relayd) { | |
881 | consumer_stream_relayd_close(stream, relayd); | |
882 | } | |
883 | rcu_read_unlock(); | |
884 | } | |
885 | ||
00e2e675 DG |
886 | /* |
887 | * Handle stream for relayd transmission if the stream applies for network | |
888 | * streaming where the net sequence index is set. | |
889 | * | |
890 | * Return destination file descriptor or negative value on error. | |
891 | */ | |
6197aea7 | 892 | static int write_relayd_stream_header(struct lttng_consumer_stream *stream, |
1d4dfdef DG |
893 | size_t data_size, unsigned long padding, |
894 | struct consumer_relayd_sock_pair *relayd) | |
00e2e675 DG |
895 | { |
896 | int outfd = -1, ret; | |
00e2e675 DG |
897 | struct lttcomm_relayd_data_hdr data_hdr; |
898 | ||
899 | /* Safety net */ | |
900 | assert(stream); | |
6197aea7 | 901 | assert(relayd); |
00e2e675 DG |
902 | |
903 | /* Reset data header */ | |
904 | memset(&data_hdr, 0, sizeof(data_hdr)); | |
905 | ||
00e2e675 DG |
906 | if (stream->metadata_flag) { |
907 | /* Caller MUST acquire the relayd control socket lock */ | |
908 | ret = relayd_send_metadata(&relayd->control_sock, data_size); | |
909 | if (ret < 0) { | |
910 | goto error; | |
911 | } | |
912 | ||
913 | /* Metadata are always sent on the control socket. */ | |
6151a90f | 914 | outfd = relayd->control_sock.sock.fd; |
00e2e675 DG |
915 | } else { |
916 | /* Set header with stream information */ | |
917 | data_hdr.stream_id = htobe64(stream->relayd_stream_id); | |
918 | data_hdr.data_size = htobe32(data_size); | |
1d4dfdef | 919 | data_hdr.padding_size = htobe32(padding); |
39df6d9f DG |
920 | /* |
921 | * Note that net_seq_num below is assigned with the *current* value of | |
922 | * next_net_seq_num and only after that the next_net_seq_num will be | |
923 | * increment. This is why when issuing a command on the relayd using | |
924 | * this next value, 1 should always be substracted in order to compare | |
925 | * the last seen sequence number on the relayd side to the last sent. | |
926 | */ | |
3604f373 | 927 | data_hdr.net_seq_num = htobe64(stream->next_net_seq_num); |
00e2e675 DG |
928 | /* Other fields are zeroed previously */ |
929 | ||
930 | ret = relayd_send_data_hdr(&relayd->data_sock, &data_hdr, | |
931 | sizeof(data_hdr)); | |
932 | if (ret < 0) { | |
933 | goto error; | |
934 | } | |
935 | ||
3604f373 DG |
936 | ++stream->next_net_seq_num; |
937 | ||
00e2e675 | 938 | /* Set to go on data socket */ |
6151a90f | 939 | outfd = relayd->data_sock.sock.fd; |
00e2e675 DG |
940 | } |
941 | ||
942 | error: | |
943 | return outfd; | |
944 | } | |
945 | ||
3bd1e081 | 946 | /* |
ffe60014 DG |
947 | * Allocate and return a new lttng_consumer_channel object using the given key |
948 | * to initialize the hash table node. | |
949 | * | |
950 | * On error, return NULL. | |
3bd1e081 | 951 | */ |
886224ff | 952 | struct lttng_consumer_channel *consumer_allocate_channel(uint64_t key, |
ffe60014 DG |
953 | uint64_t session_id, |
954 | const char *pathname, | |
955 | const char *name, | |
956 | uid_t uid, | |
957 | gid_t gid, | |
57a269f2 | 958 | uint64_t relayd_id, |
1624d5b7 JD |
959 | enum lttng_event_output output, |
960 | uint64_t tracefile_size, | |
2bba9e53 | 961 | uint64_t tracefile_count, |
1950109e | 962 | uint64_t session_id_per_pid, |
ecc48a90 | 963 | unsigned int monitor, |
d7ba1388 | 964 | unsigned int live_timer_interval, |
3d071855 | 965 | const char *root_shm_path, |
d7ba1388 | 966 | const char *shm_path) |
3bd1e081 MD |
967 | { |
968 | struct lttng_consumer_channel *channel; | |
3bd1e081 | 969 | |
276b26d1 | 970 | channel = zmalloc(sizeof(*channel)); |
3bd1e081 | 971 | if (channel == NULL) { |
7a57cf92 | 972 | PERROR("malloc struct lttng_consumer_channel"); |
3bd1e081 MD |
973 | goto end; |
974 | } | |
ffe60014 DG |
975 | |
976 | channel->key = key; | |
3bd1e081 | 977 | channel->refcount = 0; |
ffe60014 | 978 | channel->session_id = session_id; |
1950109e | 979 | channel->session_id_per_pid = session_id_per_pid; |
ffe60014 DG |
980 | channel->uid = uid; |
981 | channel->gid = gid; | |
982 | channel->relayd_id = relayd_id; | |
1624d5b7 JD |
983 | channel->tracefile_size = tracefile_size; |
984 | channel->tracefile_count = tracefile_count; | |
2bba9e53 | 985 | channel->monitor = monitor; |
ecc48a90 | 986 | channel->live_timer_interval = live_timer_interval; |
a9838785 | 987 | pthread_mutex_init(&channel->lock, NULL); |
ec6ea7d0 | 988 | pthread_mutex_init(&channel->timer_lock, NULL); |
ffe60014 | 989 | |
0c759fc9 DG |
990 | switch (output) { |
991 | case LTTNG_EVENT_SPLICE: | |
992 | channel->output = CONSUMER_CHANNEL_SPLICE; | |
993 | break; | |
994 | case LTTNG_EVENT_MMAP: | |
995 | channel->output = CONSUMER_CHANNEL_MMAP; | |
996 | break; | |
997 | default: | |
998 | assert(0); | |
999 | free(channel); | |
1000 | channel = NULL; | |
1001 | goto end; | |
1002 | } | |
1003 | ||
07b86b52 JD |
1004 | /* |
1005 | * In monitor mode, the streams associated with the channel will be put in | |
1006 | * a special list ONLY owned by this channel. So, the refcount is set to 1 | |
1007 | * here meaning that the channel itself has streams that are referenced. | |
1008 | * | |
1009 | * On a channel deletion, once the channel is no longer visible, the | |
1010 | * refcount is decremented and checked for a zero value to delete it. With | |
1011 | * streams in no monitor mode, it will now be safe to destroy the channel. | |
1012 | */ | |
1013 | if (!channel->monitor) { | |
1014 | channel->refcount = 1; | |
1015 | } | |
1016 | ||
ffe60014 DG |
1017 | strncpy(channel->pathname, pathname, sizeof(channel->pathname)); |
1018 | channel->pathname[sizeof(channel->pathname) - 1] = '\0'; | |
1019 | ||
1020 | strncpy(channel->name, name, sizeof(channel->name)); | |
1021 | channel->name[sizeof(channel->name) - 1] = '\0'; | |
1022 | ||
3d071855 MD |
1023 | if (root_shm_path) { |
1024 | strncpy(channel->root_shm_path, root_shm_path, sizeof(channel->root_shm_path)); | |
1025 | channel->root_shm_path[sizeof(channel->root_shm_path) - 1] = '\0'; | |
1026 | } | |
d7ba1388 MD |
1027 | if (shm_path) { |
1028 | strncpy(channel->shm_path, shm_path, sizeof(channel->shm_path)); | |
1029 | channel->shm_path[sizeof(channel->shm_path) - 1] = '\0'; | |
1030 | } | |
1031 | ||
d88aee68 | 1032 | lttng_ht_node_init_u64(&channel->node, channel->key); |
d8ef542d MD |
1033 | |
1034 | channel->wait_fd = -1; | |
1035 | ||
ffe60014 DG |
1036 | CDS_INIT_LIST_HEAD(&channel->streams.head); |
1037 | ||
62a7b8ed | 1038 | DBG("Allocated channel (key %" PRIu64 ")", channel->key); |
3bd1e081 | 1039 | |
3bd1e081 MD |
1040 | end: |
1041 | return channel; | |
1042 | } | |
1043 | ||
1044 | /* | |
1045 | * Add a channel to the global list protected by a mutex. | |
821fffb2 | 1046 | * |
b5a6470f | 1047 | * Always return 0 indicating success. |
3bd1e081 | 1048 | */ |
d8ef542d MD |
1049 | int consumer_add_channel(struct lttng_consumer_channel *channel, |
1050 | struct lttng_consumer_local_data *ctx) | |
3bd1e081 | 1051 | { |
3bd1e081 | 1052 | pthread_mutex_lock(&consumer_data.lock); |
a9838785 | 1053 | pthread_mutex_lock(&channel->lock); |
ec6ea7d0 | 1054 | pthread_mutex_lock(&channel->timer_lock); |
c77fc10a | 1055 | |
b5a6470f DG |
1056 | /* |
1057 | * This gives us a guarantee that the channel we are about to add to the | |
1058 | * channel hash table will be unique. See this function comment on the why | |
1059 | * we need to steel the channel key at this stage. | |
1060 | */ | |
1061 | steal_channel_key(channel->key); | |
c77fc10a | 1062 | |
b5a6470f | 1063 | rcu_read_lock(); |
d88aee68 | 1064 | lttng_ht_add_unique_u64(consumer_data.channel_ht, &channel->node); |
6065ceec | 1065 | rcu_read_unlock(); |
b5a6470f | 1066 | |
ec6ea7d0 | 1067 | pthread_mutex_unlock(&channel->timer_lock); |
a9838785 | 1068 | pthread_mutex_unlock(&channel->lock); |
3bd1e081 | 1069 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 1070 | |
b5a6470f | 1071 | if (channel->wait_fd != -1 && channel->type == CONSUMER_CHANNEL_TYPE_DATA) { |
a0cbdd2e | 1072 | notify_channel_pipe(ctx, channel, -1, CONSUMER_CHANNEL_ADD); |
d8ef542d | 1073 | } |
b5a6470f DG |
1074 | |
1075 | return 0; | |
3bd1e081 MD |
1076 | } |
1077 | ||
1078 | /* | |
1079 | * Allocate the pollfd structure and the local view of the out fds to avoid | |
1080 | * doing a lookup in the linked list and concurrency issues when writing is | |
1081 | * needed. Called with consumer_data.lock held. | |
1082 | * | |
1083 | * Returns the number of fds in the structures. | |
1084 | */ | |
ffe60014 DG |
1085 | static int update_poll_array(struct lttng_consumer_local_data *ctx, |
1086 | struct pollfd **pollfd, struct lttng_consumer_stream **local_stream, | |
9a2fcf78 | 1087 | struct lttng_ht *ht, int *nb_inactive_fd) |
3bd1e081 | 1088 | { |
3bd1e081 | 1089 | int i = 0; |
e4421fec DG |
1090 | struct lttng_ht_iter iter; |
1091 | struct lttng_consumer_stream *stream; | |
3bd1e081 | 1092 | |
ffe60014 DG |
1093 | assert(ctx); |
1094 | assert(ht); | |
1095 | assert(pollfd); | |
1096 | assert(local_stream); | |
1097 | ||
3bd1e081 | 1098 | DBG("Updating poll fd array"); |
9a2fcf78 | 1099 | *nb_inactive_fd = 0; |
481d6c57 | 1100 | rcu_read_lock(); |
43c34bc3 | 1101 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { |
8994307f DG |
1102 | /* |
1103 | * Only active streams with an active end point can be added to the | |
1104 | * poll set and local stream storage of the thread. | |
1105 | * | |
1106 | * There is a potential race here for endpoint_status to be updated | |
1107 | * just after the check. However, this is OK since the stream(s) will | |
1108 | * be deleted once the thread is notified that the end point state has | |
1109 | * changed where this function will be called back again. | |
9a2fcf78 JD |
1110 | * |
1111 | * We track the number of inactive FDs because they still need to be | |
1112 | * closed by the polling thread after a wakeup on the data_pipe or | |
1113 | * metadata_pipe. | |
8994307f DG |
1114 | */ |
1115 | if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM || | |
79d4ffb7 | 1116 | stream->endpoint_status == CONSUMER_ENDPOINT_INACTIVE) { |
9a2fcf78 | 1117 | (*nb_inactive_fd)++; |
3bd1e081 MD |
1118 | continue; |
1119 | } | |
7972aab2 DG |
1120 | /* |
1121 | * This clobbers way too much the debug output. Uncomment that if you | |
1122 | * need it for debugging purposes. | |
1123 | * | |
1124 | * DBG("Active FD %d", stream->wait_fd); | |
1125 | */ | |
e4421fec | 1126 | (*pollfd)[i].fd = stream->wait_fd; |
3bd1e081 | 1127 | (*pollfd)[i].events = POLLIN | POLLPRI; |
e4421fec | 1128 | local_stream[i] = stream; |
3bd1e081 MD |
1129 | i++; |
1130 | } | |
481d6c57 | 1131 | rcu_read_unlock(); |
3bd1e081 MD |
1132 | |
1133 | /* | |
50f8ae69 | 1134 | * Insert the consumer_data_pipe at the end of the array and don't |
3bd1e081 MD |
1135 | * increment i so nb_fd is the number of real FD. |
1136 | */ | |
acdb9057 | 1137 | (*pollfd)[i].fd = lttng_pipe_get_readfd(ctx->consumer_data_pipe); |
509bb1cf | 1138 | (*pollfd)[i].events = POLLIN | POLLPRI; |
02b3d176 DG |
1139 | |
1140 | (*pollfd)[i + 1].fd = lttng_pipe_get_readfd(ctx->consumer_wakeup_pipe); | |
1141 | (*pollfd)[i + 1].events = POLLIN | POLLPRI; | |
3bd1e081 MD |
1142 | return i; |
1143 | } | |
1144 | ||
1145 | /* | |
84382d49 MD |
1146 | * Poll on the should_quit pipe and the command socket return -1 on |
1147 | * error, 1 if should exit, 0 if data is available on the command socket | |
3bd1e081 MD |
1148 | */ |
1149 | int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll) | |
1150 | { | |
1151 | int num_rdy; | |
1152 | ||
88f2b785 | 1153 | restart: |
3bd1e081 MD |
1154 | num_rdy = poll(consumer_sockpoll, 2, -1); |
1155 | if (num_rdy == -1) { | |
88f2b785 MD |
1156 | /* |
1157 | * Restart interrupted system call. | |
1158 | */ | |
1159 | if (errno == EINTR) { | |
1160 | goto restart; | |
1161 | } | |
7a57cf92 | 1162 | PERROR("Poll error"); |
84382d49 | 1163 | return -1; |
3bd1e081 | 1164 | } |
509bb1cf | 1165 | if (consumer_sockpoll[0].revents & (POLLIN | POLLPRI)) { |
3bd1e081 | 1166 | DBG("consumer_should_quit wake up"); |
84382d49 | 1167 | return 1; |
3bd1e081 MD |
1168 | } |
1169 | return 0; | |
3bd1e081 MD |
1170 | } |
1171 | ||
1172 | /* | |
1173 | * Set the error socket. | |
1174 | */ | |
ffe60014 DG |
1175 | void lttng_consumer_set_error_sock(struct lttng_consumer_local_data *ctx, |
1176 | int sock) | |
3bd1e081 MD |
1177 | { |
1178 | ctx->consumer_error_socket = sock; | |
1179 | } | |
1180 | ||
1181 | /* | |
1182 | * Set the command socket path. | |
1183 | */ | |
3bd1e081 MD |
1184 | void lttng_consumer_set_command_sock_path( |
1185 | struct lttng_consumer_local_data *ctx, char *sock) | |
1186 | { | |
1187 | ctx->consumer_command_sock_path = sock; | |
1188 | } | |
1189 | ||
1190 | /* | |
1191 | * Send return code to the session daemon. | |
1192 | * If the socket is not defined, we return 0, it is not a fatal error | |
1193 | */ | |
ffe60014 | 1194 | int lttng_consumer_send_error(struct lttng_consumer_local_data *ctx, int cmd) |
3bd1e081 MD |
1195 | { |
1196 | if (ctx->consumer_error_socket > 0) { | |
1197 | return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd, | |
1198 | sizeof(enum lttcomm_sessiond_command)); | |
1199 | } | |
1200 | ||
1201 | return 0; | |
1202 | } | |
1203 | ||
1204 | /* | |
228b5bf7 DG |
1205 | * Close all the tracefiles and stream fds and MUST be called when all |
1206 | * instances are destroyed i.e. when all threads were joined and are ended. | |
3bd1e081 MD |
1207 | */ |
1208 | void lttng_consumer_cleanup(void) | |
1209 | { | |
e4421fec | 1210 | struct lttng_ht_iter iter; |
ffe60014 | 1211 | struct lttng_consumer_channel *channel; |
6065ceec DG |
1212 | |
1213 | rcu_read_lock(); | |
3bd1e081 | 1214 | |
ffe60014 DG |
1215 | cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, channel, |
1216 | node.node) { | |
702b1ea4 | 1217 | consumer_del_channel(channel); |
3bd1e081 | 1218 | } |
6065ceec DG |
1219 | |
1220 | rcu_read_unlock(); | |
d6ce1df2 | 1221 | |
d6ce1df2 | 1222 | lttng_ht_destroy(consumer_data.channel_ht); |
228b5bf7 DG |
1223 | |
1224 | cleanup_relayd_ht(); | |
1225 | ||
d8ef542d MD |
1226 | lttng_ht_destroy(consumer_data.stream_per_chan_id_ht); |
1227 | ||
228b5bf7 DG |
1228 | /* |
1229 | * This HT contains streams that are freed by either the metadata thread or | |
1230 | * the data thread so we do *nothing* on the hash table and simply destroy | |
1231 | * it. | |
1232 | */ | |
1233 | lttng_ht_destroy(consumer_data.stream_list_ht); | |
3bd1e081 MD |
1234 | } |
1235 | ||
1236 | /* | |
1237 | * Called from signal handler. | |
1238 | */ | |
1239 | void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx) | |
1240 | { | |
6cd525e8 MD |
1241 | ssize_t ret; |
1242 | ||
10211f5c | 1243 | CMM_STORE_SHARED(consumer_quit, 1); |
6cd525e8 MD |
1244 | ret = lttng_write(ctx->consumer_should_quit[1], "4", 1); |
1245 | if (ret < 1) { | |
7a57cf92 | 1246 | PERROR("write consumer quit"); |
3bd1e081 | 1247 | } |
ab1027f4 DG |
1248 | |
1249 | DBG("Consumer flag that it should quit"); | |
3bd1e081 MD |
1250 | } |
1251 | ||
5199ffc4 JG |
1252 | |
1253 | /* | |
1254 | * Flush pending writes to trace output disk file. | |
1255 | */ | |
1256 | static | |
00e2e675 DG |
1257 | void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream, |
1258 | off_t orig_offset) | |
3bd1e081 | 1259 | { |
c7a78aab | 1260 | int ret; |
3bd1e081 MD |
1261 | int outfd = stream->out_fd; |
1262 | ||
1263 | /* | |
1264 | * This does a blocking write-and-wait on any page that belongs to the | |
1265 | * subbuffer prior to the one we just wrote. | |
1266 | * Don't care about error values, as these are just hints and ways to | |
1267 | * limit the amount of page cache used. | |
1268 | */ | |
ffe60014 | 1269 | if (orig_offset < stream->max_sb_size) { |
3bd1e081 MD |
1270 | return; |
1271 | } | |
ffe60014 DG |
1272 | lttng_sync_file_range(outfd, orig_offset - stream->max_sb_size, |
1273 | stream->max_sb_size, | |
3bd1e081 MD |
1274 | SYNC_FILE_RANGE_WAIT_BEFORE |
1275 | | SYNC_FILE_RANGE_WRITE | |
1276 | | SYNC_FILE_RANGE_WAIT_AFTER); | |
1277 | /* | |
1278 | * Give hints to the kernel about how we access the file: | |
1279 | * POSIX_FADV_DONTNEED : we won't re-access data in a near future after | |
1280 | * we write it. | |
1281 | * | |
1282 | * We need to call fadvise again after the file grows because the | |
1283 | * kernel does not seem to apply fadvise to non-existing parts of the | |
1284 | * file. | |
1285 | * | |
1286 | * Call fadvise _after_ having waited for the page writeback to | |
1287 | * complete because the dirty page writeback semantic is not well | |
1288 | * defined. So it can be expected to lead to lower throughput in | |
1289 | * streaming. | |
1290 | */ | |
c7a78aab | 1291 | ret = posix_fadvise(outfd, orig_offset - stream->max_sb_size, |
ffe60014 | 1292 | stream->max_sb_size, POSIX_FADV_DONTNEED); |
a0d0e127 | 1293 | if (ret && ret != -ENOSYS) { |
a74a5f4a JG |
1294 | errno = ret; |
1295 | PERROR("posix_fadvise on fd %i", outfd); | |
c7a78aab | 1296 | } |
3bd1e081 MD |
1297 | } |
1298 | ||
1299 | /* | |
1300 | * Initialise the necessary environnement : | |
1301 | * - create a new context | |
1302 | * - create the poll_pipe | |
1303 | * - create the should_quit pipe (for signal handler) | |
1304 | * - create the thread pipe (for splice) | |
1305 | * | |
1306 | * Takes a function pointer as argument, this function is called when data is | |
1307 | * available on a buffer. This function is responsible to do the | |
1308 | * kernctl_get_next_subbuf, read the data with mmap or splice depending on the | |
1309 | * buffer configuration and then kernctl_put_next_subbuf at the end. | |
1310 | * | |
1311 | * Returns a pointer to the new context or NULL on error. | |
1312 | */ | |
1313 | struct lttng_consumer_local_data *lttng_consumer_create( | |
1314 | enum lttng_consumer_type type, | |
4078b776 | 1315 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
d41f73b7 | 1316 | struct lttng_consumer_local_data *ctx), |
3bd1e081 MD |
1317 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
1318 | int (*recv_stream)(struct lttng_consumer_stream *stream), | |
30319bcb | 1319 | int (*update_stream)(uint64_t stream_key, uint32_t state)) |
3bd1e081 | 1320 | { |
d8ef542d | 1321 | int ret; |
3bd1e081 MD |
1322 | struct lttng_consumer_local_data *ctx; |
1323 | ||
1324 | assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN || | |
1325 | consumer_data.type == type); | |
1326 | consumer_data.type = type; | |
1327 | ||
effcf122 | 1328 | ctx = zmalloc(sizeof(struct lttng_consumer_local_data)); |
3bd1e081 | 1329 | if (ctx == NULL) { |
7a57cf92 | 1330 | PERROR("allocating context"); |
3bd1e081 MD |
1331 | goto error; |
1332 | } | |
1333 | ||
1334 | ctx->consumer_error_socket = -1; | |
331744e3 | 1335 | ctx->consumer_metadata_socket = -1; |
75d83e50 | 1336 | pthread_mutex_init(&ctx->metadata_socket_lock, NULL); |
3bd1e081 MD |
1337 | /* assign the callbacks */ |
1338 | ctx->on_buffer_ready = buffer_ready; | |
1339 | ctx->on_recv_channel = recv_channel; | |
1340 | ctx->on_recv_stream = recv_stream; | |
1341 | ctx->on_update_stream = update_stream; | |
1342 | ||
acdb9057 DG |
1343 | ctx->consumer_data_pipe = lttng_pipe_open(0); |
1344 | if (!ctx->consumer_data_pipe) { | |
3bd1e081 MD |
1345 | goto error_poll_pipe; |
1346 | } | |
1347 | ||
02b3d176 DG |
1348 | ctx->consumer_wakeup_pipe = lttng_pipe_open(0); |
1349 | if (!ctx->consumer_wakeup_pipe) { | |
1350 | goto error_wakeup_pipe; | |
1351 | } | |
1352 | ||
3bd1e081 MD |
1353 | ret = pipe(ctx->consumer_should_quit); |
1354 | if (ret < 0) { | |
7a57cf92 | 1355 | PERROR("Error creating recv pipe"); |
3bd1e081 MD |
1356 | goto error_quit_pipe; |
1357 | } | |
1358 | ||
d8ef542d MD |
1359 | ret = pipe(ctx->consumer_channel_pipe); |
1360 | if (ret < 0) { | |
1361 | PERROR("Error creating channel pipe"); | |
1362 | goto error_channel_pipe; | |
1363 | } | |
1364 | ||
13886d2d DG |
1365 | ctx->consumer_metadata_pipe = lttng_pipe_open(0); |
1366 | if (!ctx->consumer_metadata_pipe) { | |
fb3a43a9 DG |
1367 | goto error_metadata_pipe; |
1368 | } | |
3bd1e081 | 1369 | |
e9404c27 JG |
1370 | ctx->channel_monitor_pipe = -1; |
1371 | ||
fb3a43a9 | 1372 | return ctx; |
3bd1e081 | 1373 | |
fb3a43a9 | 1374 | error_metadata_pipe: |
d8ef542d MD |
1375 | utils_close_pipe(ctx->consumer_channel_pipe); |
1376 | error_channel_pipe: | |
d8ef542d | 1377 | utils_close_pipe(ctx->consumer_should_quit); |
3bd1e081 | 1378 | error_quit_pipe: |
02b3d176 DG |
1379 | lttng_pipe_destroy(ctx->consumer_wakeup_pipe); |
1380 | error_wakeup_pipe: | |
acdb9057 | 1381 | lttng_pipe_destroy(ctx->consumer_data_pipe); |
3bd1e081 MD |
1382 | error_poll_pipe: |
1383 | free(ctx); | |
1384 | error: | |
1385 | return NULL; | |
1386 | } | |
1387 | ||
282dadbc MD |
1388 | /* |
1389 | * Iterate over all streams of the hashtable and free them properly. | |
1390 | */ | |
1391 | static void destroy_data_stream_ht(struct lttng_ht *ht) | |
1392 | { | |
1393 | struct lttng_ht_iter iter; | |
1394 | struct lttng_consumer_stream *stream; | |
1395 | ||
1396 | if (ht == NULL) { | |
1397 | return; | |
1398 | } | |
1399 | ||
1400 | rcu_read_lock(); | |
1401 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { | |
1402 | /* | |
1403 | * Ignore return value since we are currently cleaning up so any error | |
1404 | * can't be handled. | |
1405 | */ | |
1406 | (void) consumer_del_stream(stream, ht); | |
1407 | } | |
1408 | rcu_read_unlock(); | |
1409 | ||
1410 | lttng_ht_destroy(ht); | |
1411 | } | |
1412 | ||
1413 | /* | |
1414 | * Iterate over all streams of the metadata hashtable and free them | |
1415 | * properly. | |
1416 | */ | |
1417 | static void destroy_metadata_stream_ht(struct lttng_ht *ht) | |
1418 | { | |
1419 | struct lttng_ht_iter iter; | |
1420 | struct lttng_consumer_stream *stream; | |
1421 | ||
1422 | if (ht == NULL) { | |
1423 | return; | |
1424 | } | |
1425 | ||
1426 | rcu_read_lock(); | |
1427 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { | |
1428 | /* | |
1429 | * Ignore return value since we are currently cleaning up so any error | |
1430 | * can't be handled. | |
1431 | */ | |
1432 | (void) consumer_del_metadata_stream(stream, ht); | |
1433 | } | |
1434 | rcu_read_unlock(); | |
1435 | ||
1436 | lttng_ht_destroy(ht); | |
1437 | } | |
1438 | ||
3bd1e081 MD |
1439 | /* |
1440 | * Close all fds associated with the instance and free the context. | |
1441 | */ | |
1442 | void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx) | |
1443 | { | |
4c462e79 MD |
1444 | int ret; |
1445 | ||
ab1027f4 DG |
1446 | DBG("Consumer destroying it. Closing everything."); |
1447 | ||
4f2e75b9 DG |
1448 | if (!ctx) { |
1449 | return; | |
1450 | } | |
1451 | ||
282dadbc MD |
1452 | destroy_data_stream_ht(data_ht); |
1453 | destroy_metadata_stream_ht(metadata_ht); | |
1454 | ||
4c462e79 MD |
1455 | ret = close(ctx->consumer_error_socket); |
1456 | if (ret) { | |
1457 | PERROR("close"); | |
1458 | } | |
331744e3 JD |
1459 | ret = close(ctx->consumer_metadata_socket); |
1460 | if (ret) { | |
1461 | PERROR("close"); | |
1462 | } | |
d8ef542d | 1463 | utils_close_pipe(ctx->consumer_channel_pipe); |
acdb9057 | 1464 | lttng_pipe_destroy(ctx->consumer_data_pipe); |
13886d2d | 1465 | lttng_pipe_destroy(ctx->consumer_metadata_pipe); |
02b3d176 | 1466 | lttng_pipe_destroy(ctx->consumer_wakeup_pipe); |
d8ef542d | 1467 | utils_close_pipe(ctx->consumer_should_quit); |
fb3a43a9 | 1468 | |
3bd1e081 MD |
1469 | unlink(ctx->consumer_command_sock_path); |
1470 | free(ctx); | |
1471 | } | |
1472 | ||
6197aea7 DG |
1473 | /* |
1474 | * Write the metadata stream id on the specified file descriptor. | |
1475 | */ | |
1476 | static int write_relayd_metadata_id(int fd, | |
1477 | struct lttng_consumer_stream *stream, | |
ffe60014 | 1478 | struct consumer_relayd_sock_pair *relayd, unsigned long padding) |
6197aea7 | 1479 | { |
6cd525e8 | 1480 | ssize_t ret; |
1d4dfdef | 1481 | struct lttcomm_relayd_metadata_payload hdr; |
6197aea7 | 1482 | |
1d4dfdef DG |
1483 | hdr.stream_id = htobe64(stream->relayd_stream_id); |
1484 | hdr.padding_size = htobe32(padding); | |
6cd525e8 MD |
1485 | ret = lttng_write(fd, (void *) &hdr, sizeof(hdr)); |
1486 | if (ret < sizeof(hdr)) { | |
d7b75ec8 | 1487 | /* |
6f04ed72 | 1488 | * This error means that the fd's end is closed so ignore the PERROR |
d7b75ec8 DG |
1489 | * not to clubber the error output since this can happen in a normal |
1490 | * code path. | |
1491 | */ | |
1492 | if (errno != EPIPE) { | |
1493 | PERROR("write metadata stream id"); | |
1494 | } | |
1495 | DBG3("Consumer failed to write relayd metadata id (errno: %d)", errno); | |
534d2592 DG |
1496 | /* |
1497 | * Set ret to a negative value because if ret != sizeof(hdr), we don't | |
1498 | * handle writting the missing part so report that as an error and | |
1499 | * don't lie to the caller. | |
1500 | */ | |
1501 | ret = -1; | |
6197aea7 DG |
1502 | goto end; |
1503 | } | |
1d4dfdef DG |
1504 | DBG("Metadata stream id %" PRIu64 " with padding %lu written before data", |
1505 | stream->relayd_stream_id, padding); | |
6197aea7 DG |
1506 | |
1507 | end: | |
6cd525e8 | 1508 | return (int) ret; |
6197aea7 DG |
1509 | } |
1510 | ||
3bd1e081 | 1511 | /* |
09e26845 DG |
1512 | * Mmap the ring buffer, read it and write the data to the tracefile. This is a |
1513 | * core function for writing trace buffers to either the local filesystem or | |
1514 | * the network. | |
1515 | * | |
79d4ffb7 DG |
1516 | * It must be called with the stream lock held. |
1517 | * | |
09e26845 | 1518 | * Careful review MUST be put if any changes occur! |
3bd1e081 MD |
1519 | * |
1520 | * Returns the number of bytes written | |
1521 | */ | |
4078b776 | 1522 | ssize_t lttng_consumer_on_read_subbuffer_mmap( |
3bd1e081 | 1523 | struct lttng_consumer_local_data *ctx, |
1d4dfdef | 1524 | struct lttng_consumer_stream *stream, unsigned long len, |
309167d2 | 1525 | unsigned long padding, |
50adc264 | 1526 | struct ctf_packet_index *index) |
3bd1e081 | 1527 | { |
f02e1e8a | 1528 | unsigned long mmap_offset; |
ffe60014 | 1529 | void *mmap_base; |
994ab360 | 1530 | ssize_t ret = 0; |
f02e1e8a DG |
1531 | off_t orig_offset = stream->out_fd_offset; |
1532 | /* Default is on the disk */ | |
1533 | int outfd = stream->out_fd; | |
f02e1e8a | 1534 | struct consumer_relayd_sock_pair *relayd = NULL; |
8994307f | 1535 | unsigned int relayd_hang_up = 0; |
f02e1e8a DG |
1536 | |
1537 | /* RCU lock for the relayd pointer */ | |
1538 | rcu_read_lock(); | |
1539 | ||
1540 | /* Flag that the current stream if set for network streaming. */ | |
da009f2c | 1541 | if (stream->net_seq_idx != (uint64_t) -1ULL) { |
f02e1e8a DG |
1542 | relayd = consumer_find_relayd(stream->net_seq_idx); |
1543 | if (relayd == NULL) { | |
56591bac | 1544 | ret = -EPIPE; |
f02e1e8a DG |
1545 | goto end; |
1546 | } | |
1547 | } | |
1548 | ||
1549 | /* get the offset inside the fd to mmap */ | |
3bd1e081 MD |
1550 | switch (consumer_data.type) { |
1551 | case LTTNG_CONSUMER_KERNEL: | |
ffe60014 | 1552 | mmap_base = stream->mmap_base; |
f02e1e8a | 1553 | ret = kernctl_get_mmap_read_offset(stream->wait_fd, &mmap_offset); |
994ab360 | 1554 | if (ret < 0) { |
56591bac | 1555 | PERROR("tracer ctl get_mmap_read_offset"); |
56591bac MD |
1556 | goto end; |
1557 | } | |
f02e1e8a | 1558 | break; |
7753dea8 MD |
1559 | case LTTNG_CONSUMER32_UST: |
1560 | case LTTNG_CONSUMER64_UST: | |
ffe60014 DG |
1561 | mmap_base = lttng_ustctl_get_mmap_base(stream); |
1562 | if (!mmap_base) { | |
1563 | ERR("read mmap get mmap base for stream %s", stream->name); | |
994ab360 | 1564 | ret = -EPERM; |
ffe60014 DG |
1565 | goto end; |
1566 | } | |
1567 | ret = lttng_ustctl_get_mmap_read_offset(stream, &mmap_offset); | |
56591bac MD |
1568 | if (ret != 0) { |
1569 | PERROR("tracer ctl get_mmap_read_offset"); | |
994ab360 | 1570 | ret = -EINVAL; |
56591bac MD |
1571 | goto end; |
1572 | } | |
f02e1e8a | 1573 | break; |
3bd1e081 MD |
1574 | default: |
1575 | ERR("Unknown consumer_data type"); | |
1576 | assert(0); | |
1577 | } | |
b9182dd9 | 1578 | |
f02e1e8a DG |
1579 | /* Handle stream on the relayd if the output is on the network */ |
1580 | if (relayd) { | |
1581 | unsigned long netlen = len; | |
1582 | ||
1583 | /* | |
1584 | * Lock the control socket for the complete duration of the function | |
1585 | * since from this point on we will use the socket. | |
1586 | */ | |
1587 | if (stream->metadata_flag) { | |
1588 | /* Metadata requires the control socket. */ | |
1589 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
93ec662e JD |
1590 | if (stream->reset_metadata_flag) { |
1591 | ret = relayd_reset_metadata(&relayd->control_sock, | |
1592 | stream->relayd_stream_id, | |
1593 | stream->metadata_version); | |
1594 | if (ret < 0) { | |
1595 | relayd_hang_up = 1; | |
1596 | goto write_error; | |
1597 | } | |
1598 | stream->reset_metadata_flag = 0; | |
1599 | } | |
1d4dfdef | 1600 | netlen += sizeof(struct lttcomm_relayd_metadata_payload); |
f02e1e8a DG |
1601 | } |
1602 | ||
1d4dfdef | 1603 | ret = write_relayd_stream_header(stream, netlen, padding, relayd); |
994ab360 DG |
1604 | if (ret < 0) { |
1605 | relayd_hang_up = 1; | |
1606 | goto write_error; | |
1607 | } | |
1608 | /* Use the returned socket. */ | |
1609 | outfd = ret; | |
f02e1e8a | 1610 | |
994ab360 DG |
1611 | /* Write metadata stream id before payload */ |
1612 | if (stream->metadata_flag) { | |
1613 | ret = write_relayd_metadata_id(outfd, stream, relayd, padding); | |
1614 | if (ret < 0) { | |
8994307f DG |
1615 | relayd_hang_up = 1; |
1616 | goto write_error; | |
1617 | } | |
f02e1e8a | 1618 | } |
1d4dfdef DG |
1619 | } else { |
1620 | /* No streaming, we have to set the len with the full padding */ | |
1621 | len += padding; | |
1624d5b7 | 1622 | |
93ec662e JD |
1623 | if (stream->metadata_flag && stream->reset_metadata_flag) { |
1624 | ret = utils_truncate_stream_file(stream->out_fd, 0); | |
1625 | if (ret < 0) { | |
1626 | ERR("Reset metadata file"); | |
1627 | goto end; | |
1628 | } | |
1629 | stream->reset_metadata_flag = 0; | |
1630 | } | |
1631 | ||
1624d5b7 JD |
1632 | /* |
1633 | * Check if we need to change the tracefile before writing the packet. | |
1634 | */ | |
1635 | if (stream->chan->tracefile_size > 0 && | |
1636 | (stream->tracefile_size_current + len) > | |
1637 | stream->chan->tracefile_size) { | |
fe4477ee JD |
1638 | ret = utils_rotate_stream_file(stream->chan->pathname, |
1639 | stream->name, stream->chan->tracefile_size, | |
1640 | stream->chan->tracefile_count, stream->uid, stream->gid, | |
309167d2 JD |
1641 | stream->out_fd, &(stream->tracefile_count_current), |
1642 | &stream->out_fd); | |
1624d5b7 JD |
1643 | if (ret < 0) { |
1644 | ERR("Rotating output file"); | |
1645 | goto end; | |
1646 | } | |
309167d2 JD |
1647 | outfd = stream->out_fd; |
1648 | ||
f8f3885c MD |
1649 | if (stream->index_file) { |
1650 | lttng_index_file_put(stream->index_file); | |
1651 | stream->index_file = lttng_index_file_create(stream->chan->pathname, | |
309167d2 JD |
1652 | stream->name, stream->uid, stream->gid, |
1653 | stream->chan->tracefile_size, | |
f8f3885c MD |
1654 | stream->tracefile_count_current, |
1655 | CTF_INDEX_MAJOR, CTF_INDEX_MINOR); | |
1656 | if (!stream->index_file) { | |
309167d2 JD |
1657 | goto end; |
1658 | } | |
309167d2 JD |
1659 | } |
1660 | ||
a6976990 DG |
1661 | /* Reset current size because we just perform a rotation. */ |
1662 | stream->tracefile_size_current = 0; | |
a1ae300f JD |
1663 | stream->out_fd_offset = 0; |
1664 | orig_offset = 0; | |
1624d5b7 JD |
1665 | } |
1666 | stream->tracefile_size_current += len; | |
309167d2 JD |
1667 | if (index) { |
1668 | index->offset = htobe64(stream->out_fd_offset); | |
1669 | } | |
f02e1e8a DG |
1670 | } |
1671 | ||
d02b8372 DG |
1672 | /* |
1673 | * This call guarantee that len or less is returned. It's impossible to | |
1674 | * receive a ret value that is bigger than len. | |
1675 | */ | |
1676 | ret = lttng_write(outfd, mmap_base + mmap_offset, len); | |
1677 | DBG("Consumer mmap write() ret %zd (len %lu)", ret, len); | |
1678 | if (ret < 0 || ((size_t) ret != len)) { | |
1679 | /* | |
1680 | * Report error to caller if nothing was written else at least send the | |
1681 | * amount written. | |
1682 | */ | |
1683 | if (ret < 0) { | |
994ab360 | 1684 | ret = -errno; |
f02e1e8a | 1685 | } |
994ab360 | 1686 | relayd_hang_up = 1; |
f02e1e8a | 1687 | |
d02b8372 | 1688 | /* Socket operation failed. We consider the relayd dead */ |
994ab360 | 1689 | if (errno == EPIPE || errno == EINVAL || errno == EBADF) { |
d02b8372 DG |
1690 | /* |
1691 | * This is possible if the fd is closed on the other side | |
1692 | * (outfd) or any write problem. It can be verbose a bit for a | |
1693 | * normal execution if for instance the relayd is stopped | |
1694 | * abruptly. This can happen so set this to a DBG statement. | |
1695 | */ | |
1696 | DBG("Consumer mmap write detected relayd hang up"); | |
994ab360 DG |
1697 | } else { |
1698 | /* Unhandled error, print it and stop function right now. */ | |
1699 | PERROR("Error in write mmap (ret %zd != len %lu)", ret, len); | |
f02e1e8a | 1700 | } |
994ab360 | 1701 | goto write_error; |
d02b8372 DG |
1702 | } |
1703 | stream->output_written += ret; | |
d02b8372 DG |
1704 | |
1705 | /* This call is useless on a socket so better save a syscall. */ | |
1706 | if (!relayd) { | |
1707 | /* This won't block, but will start writeout asynchronously */ | |
1708 | lttng_sync_file_range(outfd, stream->out_fd_offset, len, | |
1709 | SYNC_FILE_RANGE_WRITE); | |
1710 | stream->out_fd_offset += len; | |
f5dbe415 | 1711 | lttng_consumer_sync_trace_file(stream, orig_offset); |
f02e1e8a | 1712 | } |
f02e1e8a | 1713 | |
8994307f DG |
1714 | write_error: |
1715 | /* | |
1716 | * This is a special case that the relayd has closed its socket. Let's | |
1717 | * cleanup the relayd object and all associated streams. | |
1718 | */ | |
1719 | if (relayd && relayd_hang_up) { | |
1720 | cleanup_relayd(relayd, ctx); | |
1721 | } | |
1722 | ||
f02e1e8a DG |
1723 | end: |
1724 | /* Unlock only if ctrl socket used */ | |
1725 | if (relayd && stream->metadata_flag) { | |
1726 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1727 | } | |
1728 | ||
1729 | rcu_read_unlock(); | |
994ab360 | 1730 | return ret; |
3bd1e081 MD |
1731 | } |
1732 | ||
1733 | /* | |
1734 | * Splice the data from the ring buffer to the tracefile. | |
1735 | * | |
79d4ffb7 DG |
1736 | * It must be called with the stream lock held. |
1737 | * | |
3bd1e081 MD |
1738 | * Returns the number of bytes spliced. |
1739 | */ | |
4078b776 | 1740 | ssize_t lttng_consumer_on_read_subbuffer_splice( |
3bd1e081 | 1741 | struct lttng_consumer_local_data *ctx, |
1d4dfdef | 1742 | struct lttng_consumer_stream *stream, unsigned long len, |
309167d2 | 1743 | unsigned long padding, |
50adc264 | 1744 | struct ctf_packet_index *index) |
3bd1e081 | 1745 | { |
f02e1e8a DG |
1746 | ssize_t ret = 0, written = 0, ret_splice = 0; |
1747 | loff_t offset = 0; | |
1748 | off_t orig_offset = stream->out_fd_offset; | |
1749 | int fd = stream->wait_fd; | |
1750 | /* Default is on the disk */ | |
1751 | int outfd = stream->out_fd; | |
f02e1e8a | 1752 | struct consumer_relayd_sock_pair *relayd = NULL; |
fb3a43a9 | 1753 | int *splice_pipe; |
8994307f | 1754 | unsigned int relayd_hang_up = 0; |
f02e1e8a | 1755 | |
3bd1e081 MD |
1756 | switch (consumer_data.type) { |
1757 | case LTTNG_CONSUMER_KERNEL: | |
f02e1e8a | 1758 | break; |
7753dea8 MD |
1759 | case LTTNG_CONSUMER32_UST: |
1760 | case LTTNG_CONSUMER64_UST: | |
f02e1e8a | 1761 | /* Not supported for user space tracing */ |
3bd1e081 MD |
1762 | return -ENOSYS; |
1763 | default: | |
1764 | ERR("Unknown consumer_data type"); | |
1765 | assert(0); | |
3bd1e081 MD |
1766 | } |
1767 | ||
f02e1e8a DG |
1768 | /* RCU lock for the relayd pointer */ |
1769 | rcu_read_lock(); | |
1770 | ||
1771 | /* Flag that the current stream if set for network streaming. */ | |
da009f2c | 1772 | if (stream->net_seq_idx != (uint64_t) -1ULL) { |
f02e1e8a DG |
1773 | relayd = consumer_find_relayd(stream->net_seq_idx); |
1774 | if (relayd == NULL) { | |
ad0b0d23 | 1775 | written = -ret; |
f02e1e8a DG |
1776 | goto end; |
1777 | } | |
1778 | } | |
a2361a61 | 1779 | splice_pipe = stream->splice_pipe; |
fb3a43a9 | 1780 | |
f02e1e8a | 1781 | /* Write metadata stream id before payload */ |
1d4dfdef | 1782 | if (relayd) { |
ad0b0d23 | 1783 | unsigned long total_len = len; |
f02e1e8a | 1784 | |
1d4dfdef DG |
1785 | if (stream->metadata_flag) { |
1786 | /* | |
1787 | * Lock the control socket for the complete duration of the function | |
1788 | * since from this point on we will use the socket. | |
1789 | */ | |
1790 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1791 | ||
93ec662e JD |
1792 | if (stream->reset_metadata_flag) { |
1793 | ret = relayd_reset_metadata(&relayd->control_sock, | |
1794 | stream->relayd_stream_id, | |
1795 | stream->metadata_version); | |
1796 | if (ret < 0) { | |
1797 | relayd_hang_up = 1; | |
1798 | goto write_error; | |
1799 | } | |
1800 | stream->reset_metadata_flag = 0; | |
1801 | } | |
1d4dfdef DG |
1802 | ret = write_relayd_metadata_id(splice_pipe[1], stream, relayd, |
1803 | padding); | |
1804 | if (ret < 0) { | |
1805 | written = ret; | |
ad0b0d23 DG |
1806 | relayd_hang_up = 1; |
1807 | goto write_error; | |
1d4dfdef DG |
1808 | } |
1809 | ||
1810 | total_len += sizeof(struct lttcomm_relayd_metadata_payload); | |
1811 | } | |
1812 | ||
1813 | ret = write_relayd_stream_header(stream, total_len, padding, relayd); | |
ad0b0d23 DG |
1814 | if (ret < 0) { |
1815 | written = ret; | |
1816 | relayd_hang_up = 1; | |
1817 | goto write_error; | |
f02e1e8a | 1818 | } |
ad0b0d23 DG |
1819 | /* Use the returned socket. */ |
1820 | outfd = ret; | |
1d4dfdef DG |
1821 | } else { |
1822 | /* No streaming, we have to set the len with the full padding */ | |
1823 | len += padding; | |
1624d5b7 | 1824 | |
93ec662e JD |
1825 | if (stream->metadata_flag && stream->reset_metadata_flag) { |
1826 | ret = utils_truncate_stream_file(stream->out_fd, 0); | |
1827 | if (ret < 0) { | |
1828 | ERR("Reset metadata file"); | |
1829 | goto end; | |
1830 | } | |
1831 | stream->reset_metadata_flag = 0; | |
1832 | } | |
1624d5b7 JD |
1833 | /* |
1834 | * Check if we need to change the tracefile before writing the packet. | |
1835 | */ | |
1836 | if (stream->chan->tracefile_size > 0 && | |
1837 | (stream->tracefile_size_current + len) > | |
1838 | stream->chan->tracefile_size) { | |
fe4477ee JD |
1839 | ret = utils_rotate_stream_file(stream->chan->pathname, |
1840 | stream->name, stream->chan->tracefile_size, | |
1841 | stream->chan->tracefile_count, stream->uid, stream->gid, | |
309167d2 JD |
1842 | stream->out_fd, &(stream->tracefile_count_current), |
1843 | &stream->out_fd); | |
1624d5b7 | 1844 | if (ret < 0) { |
ad0b0d23 | 1845 | written = ret; |
1624d5b7 JD |
1846 | ERR("Rotating output file"); |
1847 | goto end; | |
1848 | } | |
309167d2 JD |
1849 | outfd = stream->out_fd; |
1850 | ||
f8f3885c MD |
1851 | if (stream->index_file) { |
1852 | lttng_index_file_put(stream->index_file); | |
1853 | stream->index_file = lttng_index_file_create(stream->chan->pathname, | |
309167d2 JD |
1854 | stream->name, stream->uid, stream->gid, |
1855 | stream->chan->tracefile_size, | |
f8f3885c MD |
1856 | stream->tracefile_count_current, |
1857 | CTF_INDEX_MAJOR, CTF_INDEX_MINOR); | |
1858 | if (!stream->index_file) { | |
309167d2 JD |
1859 | goto end; |
1860 | } | |
309167d2 JD |
1861 | } |
1862 | ||
a6976990 DG |
1863 | /* Reset current size because we just perform a rotation. */ |
1864 | stream->tracefile_size_current = 0; | |
a1ae300f JD |
1865 | stream->out_fd_offset = 0; |
1866 | orig_offset = 0; | |
1624d5b7 JD |
1867 | } |
1868 | stream->tracefile_size_current += len; | |
309167d2 | 1869 | index->offset = htobe64(stream->out_fd_offset); |
f02e1e8a DG |
1870 | } |
1871 | ||
1872 | while (len > 0) { | |
1d4dfdef DG |
1873 | DBG("splice chan to pipe offset %lu of len %lu (fd : %d, pipe: %d)", |
1874 | (unsigned long)offset, len, fd, splice_pipe[1]); | |
fb3a43a9 | 1875 | ret_splice = splice(fd, &offset, splice_pipe[1], NULL, len, |
f02e1e8a DG |
1876 | SPLICE_F_MOVE | SPLICE_F_MORE); |
1877 | DBG("splice chan to pipe, ret %zd", ret_splice); | |
1878 | if (ret_splice < 0) { | |
d02b8372 | 1879 | ret = errno; |
ad0b0d23 | 1880 | written = -ret; |
d02b8372 | 1881 | PERROR("Error in relay splice"); |
f02e1e8a DG |
1882 | goto splice_error; |
1883 | } | |
1884 | ||
1885 | /* Handle stream on the relayd if the output is on the network */ | |
ad0b0d23 DG |
1886 | if (relayd && stream->metadata_flag) { |
1887 | size_t metadata_payload_size = | |
1888 | sizeof(struct lttcomm_relayd_metadata_payload); | |
1889 | ||
1890 | /* Update counter to fit the spliced data */ | |
1891 | ret_splice += metadata_payload_size; | |
1892 | len += metadata_payload_size; | |
1893 | /* | |
1894 | * We do this so the return value can match the len passed as | |
1895 | * argument to this function. | |
1896 | */ | |
1897 | written -= metadata_payload_size; | |
f02e1e8a DG |
1898 | } |
1899 | ||
1900 | /* Splice data out */ | |
fb3a43a9 | 1901 | ret_splice = splice(splice_pipe[0], NULL, outfd, NULL, |
f02e1e8a | 1902 | ret_splice, SPLICE_F_MOVE | SPLICE_F_MORE); |
a2361a61 JD |
1903 | DBG("Consumer splice pipe to file (out_fd: %d), ret %zd", |
1904 | outfd, ret_splice); | |
f02e1e8a | 1905 | if (ret_splice < 0) { |
d02b8372 | 1906 | ret = errno; |
ad0b0d23 DG |
1907 | written = -ret; |
1908 | relayd_hang_up = 1; | |
1909 | goto write_error; | |
f02e1e8a | 1910 | } else if (ret_splice > len) { |
d02b8372 DG |
1911 | /* |
1912 | * We don't expect this code path to be executed but you never know | |
1913 | * so this is an extra protection agains a buggy splice(). | |
1914 | */ | |
f02e1e8a | 1915 | ret = errno; |
ad0b0d23 | 1916 | written += ret_splice; |
d02b8372 DG |
1917 | PERROR("Wrote more data than requested %zd (len: %lu)", ret_splice, |
1918 | len); | |
f02e1e8a | 1919 | goto splice_error; |
d02b8372 DG |
1920 | } else { |
1921 | /* All good, update current len and continue. */ | |
1922 | len -= ret_splice; | |
f02e1e8a | 1923 | } |
f02e1e8a DG |
1924 | |
1925 | /* This call is useless on a socket so better save a syscall. */ | |
1926 | if (!relayd) { | |
1927 | /* This won't block, but will start writeout asynchronously */ | |
1928 | lttng_sync_file_range(outfd, stream->out_fd_offset, ret_splice, | |
1929 | SYNC_FILE_RANGE_WRITE); | |
1930 | stream->out_fd_offset += ret_splice; | |
1931 | } | |
e5d1a9b3 | 1932 | stream->output_written += ret_splice; |
f02e1e8a DG |
1933 | written += ret_splice; |
1934 | } | |
f5dbe415 JG |
1935 | if (!relayd) { |
1936 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
1937 | } | |
f02e1e8a DG |
1938 | goto end; |
1939 | ||
8994307f DG |
1940 | write_error: |
1941 | /* | |
1942 | * This is a special case that the relayd has closed its socket. Let's | |
1943 | * cleanup the relayd object and all associated streams. | |
1944 | */ | |
1945 | if (relayd && relayd_hang_up) { | |
1946 | cleanup_relayd(relayd, ctx); | |
1947 | /* Skip splice error so the consumer does not fail */ | |
1948 | goto end; | |
1949 | } | |
1950 | ||
f02e1e8a DG |
1951 | splice_error: |
1952 | /* send the appropriate error description to sessiond */ | |
1953 | switch (ret) { | |
f02e1e8a | 1954 | case EINVAL: |
f73fabfd | 1955 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_EINVAL); |
f02e1e8a DG |
1956 | break; |
1957 | case ENOMEM: | |
f73fabfd | 1958 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ENOMEM); |
f02e1e8a DG |
1959 | break; |
1960 | case ESPIPE: | |
f73fabfd | 1961 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ESPIPE); |
f02e1e8a DG |
1962 | break; |
1963 | } | |
1964 | ||
1965 | end: | |
1966 | if (relayd && stream->metadata_flag) { | |
1967 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1968 | } | |
1969 | ||
1970 | rcu_read_unlock(); | |
1971 | return written; | |
3bd1e081 MD |
1972 | } |
1973 | ||
1974 | /* | |
1975 | * Take a snapshot for a specific fd | |
1976 | * | |
1977 | * Returns 0 on success, < 0 on error | |
1978 | */ | |
ffe60014 | 1979 | int lttng_consumer_take_snapshot(struct lttng_consumer_stream *stream) |
3bd1e081 MD |
1980 | { |
1981 | switch (consumer_data.type) { | |
1982 | case LTTNG_CONSUMER_KERNEL: | |
ffe60014 | 1983 | return lttng_kconsumer_take_snapshot(stream); |
7753dea8 MD |
1984 | case LTTNG_CONSUMER32_UST: |
1985 | case LTTNG_CONSUMER64_UST: | |
ffe60014 | 1986 | return lttng_ustconsumer_take_snapshot(stream); |
3bd1e081 MD |
1987 | default: |
1988 | ERR("Unknown consumer_data type"); | |
1989 | assert(0); | |
1990 | return -ENOSYS; | |
1991 | } | |
3bd1e081 MD |
1992 | } |
1993 | ||
1994 | /* | |
1995 | * Get the produced position | |
1996 | * | |
1997 | * Returns 0 on success, < 0 on error | |
1998 | */ | |
ffe60014 | 1999 | int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream *stream, |
3bd1e081 MD |
2000 | unsigned long *pos) |
2001 | { | |
2002 | switch (consumer_data.type) { | |
2003 | case LTTNG_CONSUMER_KERNEL: | |
ffe60014 | 2004 | return lttng_kconsumer_get_produced_snapshot(stream, pos); |
7753dea8 MD |
2005 | case LTTNG_CONSUMER32_UST: |
2006 | case LTTNG_CONSUMER64_UST: | |
ffe60014 | 2007 | return lttng_ustconsumer_get_produced_snapshot(stream, pos); |
3bd1e081 MD |
2008 | default: |
2009 | ERR("Unknown consumer_data type"); | |
2010 | assert(0); | |
2011 | return -ENOSYS; | |
2012 | } | |
2013 | } | |
2014 | ||
2015 | int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, | |
2016 | int sock, struct pollfd *consumer_sockpoll) | |
2017 | { | |
2018 | switch (consumer_data.type) { | |
2019 | case LTTNG_CONSUMER_KERNEL: | |
2020 | return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
7753dea8 MD |
2021 | case LTTNG_CONSUMER32_UST: |
2022 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
2023 | return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll); |
2024 | default: | |
2025 | ERR("Unknown consumer_data type"); | |
2026 | assert(0); | |
2027 | return -ENOSYS; | |
2028 | } | |
2029 | } | |
2030 | ||
6d574024 | 2031 | void lttng_consumer_close_all_metadata(void) |
d88aee68 DG |
2032 | { |
2033 | switch (consumer_data.type) { | |
2034 | case LTTNG_CONSUMER_KERNEL: | |
2035 | /* | |
2036 | * The Kernel consumer has a different metadata scheme so we don't | |
2037 | * close anything because the stream will be closed by the session | |
2038 | * daemon. | |
2039 | */ | |
2040 | break; | |
2041 | case LTTNG_CONSUMER32_UST: | |
2042 | case LTTNG_CONSUMER64_UST: | |
2043 | /* | |
2044 | * Close all metadata streams. The metadata hash table is passed and | |
2045 | * this call iterates over it by closing all wakeup fd. This is safe | |
2046 | * because at this point we are sure that the metadata producer is | |
2047 | * either dead or blocked. | |
2048 | */ | |
6d574024 | 2049 | lttng_ustconsumer_close_all_metadata(metadata_ht); |
d88aee68 DG |
2050 | break; |
2051 | default: | |
2052 | ERR("Unknown consumer_data type"); | |
2053 | assert(0); | |
2054 | } | |
2055 | } | |
2056 | ||
fb3a43a9 DG |
2057 | /* |
2058 | * Clean up a metadata stream and free its memory. | |
2059 | */ | |
e316aad5 DG |
2060 | void consumer_del_metadata_stream(struct lttng_consumer_stream *stream, |
2061 | struct lttng_ht *ht) | |
fb3a43a9 | 2062 | { |
e316aad5 | 2063 | struct lttng_consumer_channel *free_chan = NULL; |
fb3a43a9 DG |
2064 | |
2065 | assert(stream); | |
2066 | /* | |
2067 | * This call should NEVER receive regular stream. It must always be | |
2068 | * metadata stream and this is crucial for data structure synchronization. | |
2069 | */ | |
2070 | assert(stream->metadata_flag); | |
2071 | ||
e316aad5 DG |
2072 | DBG3("Consumer delete metadata stream %d", stream->wait_fd); |
2073 | ||
74251bb8 | 2074 | pthread_mutex_lock(&consumer_data.lock); |
fb549e7a | 2075 | pthread_mutex_lock(&stream->chan->lock); |
3dad2c0f | 2076 | pthread_mutex_lock(&stream->lock); |
081424af JG |
2077 | if (stream->chan->metadata_cache) { |
2078 | /* Only applicable to userspace consumers. */ | |
2079 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); | |
2080 | } | |
8994307f | 2081 | |
6d574024 DG |
2082 | /* Remove any reference to that stream. */ |
2083 | consumer_stream_delete(stream, ht); | |
ca22feea | 2084 | |
6d574024 DG |
2085 | /* Close down everything including the relayd if one. */ |
2086 | consumer_stream_close(stream); | |
2087 | /* Destroy tracer buffers of the stream. */ | |
2088 | consumer_stream_destroy_buffers(stream); | |
fb3a43a9 DG |
2089 | |
2090 | /* Atomically decrement channel refcount since other threads can use it. */ | |
f2ad556d | 2091 | if (!uatomic_sub_return(&stream->chan->refcount, 1) |
ffe60014 | 2092 | && !uatomic_read(&stream->chan->nb_init_stream_left)) { |
c30aaa51 | 2093 | /* Go for channel deletion! */ |
e316aad5 | 2094 | free_chan = stream->chan; |
fb3a43a9 DG |
2095 | } |
2096 | ||
73811ecc DG |
2097 | /* |
2098 | * Nullify the stream reference so it is not used after deletion. The | |
6d574024 DG |
2099 | * channel lock MUST be acquired before being able to check for a NULL |
2100 | * pointer value. | |
73811ecc DG |
2101 | */ |
2102 | stream->chan->metadata_stream = NULL; | |
2103 | ||
081424af JG |
2104 | if (stream->chan->metadata_cache) { |
2105 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); | |
2106 | } | |
3dad2c0f | 2107 | pthread_mutex_unlock(&stream->lock); |
fb549e7a | 2108 | pthread_mutex_unlock(&stream->chan->lock); |
74251bb8 | 2109 | pthread_mutex_unlock(&consumer_data.lock); |
e316aad5 DG |
2110 | |
2111 | if (free_chan) { | |
2112 | consumer_del_channel(free_chan); | |
2113 | } | |
2114 | ||
6d574024 | 2115 | consumer_stream_free(stream); |
fb3a43a9 DG |
2116 | } |
2117 | ||
2118 | /* | |
2119 | * Action done with the metadata stream when adding it to the consumer internal | |
2120 | * data structures to handle it. | |
2121 | */ | |
66d583dc | 2122 | void consumer_add_metadata_stream(struct lttng_consumer_stream *stream) |
fb3a43a9 | 2123 | { |
5ab66908 | 2124 | struct lttng_ht *ht = metadata_ht; |
76082088 | 2125 | struct lttng_ht_iter iter; |
d88aee68 | 2126 | struct lttng_ht_node_u64 *node; |
fb3a43a9 | 2127 | |
e316aad5 DG |
2128 | assert(stream); |
2129 | assert(ht); | |
2130 | ||
d88aee68 | 2131 | DBG3("Adding metadata stream %" PRIu64 " to hash table", stream->key); |
e316aad5 DG |
2132 | |
2133 | pthread_mutex_lock(&consumer_data.lock); | |
a9838785 | 2134 | pthread_mutex_lock(&stream->chan->lock); |
ec6ea7d0 | 2135 | pthread_mutex_lock(&stream->chan->timer_lock); |
2e818a6a | 2136 | pthread_mutex_lock(&stream->lock); |
e316aad5 | 2137 | |
e316aad5 DG |
2138 | /* |
2139 | * From here, refcounts are updated so be _careful_ when returning an error | |
2140 | * after this point. | |
2141 | */ | |
2142 | ||
fb3a43a9 | 2143 | rcu_read_lock(); |
76082088 DG |
2144 | |
2145 | /* | |
2146 | * Lookup the stream just to make sure it does not exist in our internal | |
2147 | * state. This should NEVER happen. | |
2148 | */ | |
d88aee68 DG |
2149 | lttng_ht_lookup(ht, &stream->key, &iter); |
2150 | node = lttng_ht_iter_get_node_u64(&iter); | |
76082088 DG |
2151 | assert(!node); |
2152 | ||
e316aad5 | 2153 | /* |
ffe60014 DG |
2154 | * When nb_init_stream_left reaches 0, we don't need to trigger any action |
2155 | * in terms of destroying the associated channel, because the action that | |
e316aad5 DG |
2156 | * causes the count to become 0 also causes a stream to be added. The |
2157 | * channel deletion will thus be triggered by the following removal of this | |
2158 | * stream. | |
2159 | */ | |
ffe60014 | 2160 | if (uatomic_read(&stream->chan->nb_init_stream_left) > 0) { |
f2ad556d MD |
2161 | /* Increment refcount before decrementing nb_init_stream_left */ |
2162 | cmm_smp_wmb(); | |
ffe60014 | 2163 | uatomic_dec(&stream->chan->nb_init_stream_left); |
e316aad5 DG |
2164 | } |
2165 | ||
d88aee68 | 2166 | lttng_ht_add_unique_u64(ht, &stream->node); |
ca22feea | 2167 | |
446156b4 | 2168 | lttng_ht_add_u64(consumer_data.stream_per_chan_id_ht, |
d8ef542d MD |
2169 | &stream->node_channel_id); |
2170 | ||
ca22feea DG |
2171 | /* |
2172 | * Add stream to the stream_list_ht of the consumer data. No need to steal | |
2173 | * the key since the HT does not use it and we allow to add redundant keys | |
2174 | * into this table. | |
2175 | */ | |
d88aee68 | 2176 | lttng_ht_add_u64(consumer_data.stream_list_ht, &stream->node_session_id); |
ca22feea | 2177 | |
fb3a43a9 | 2178 | rcu_read_unlock(); |
e316aad5 | 2179 | |
2e818a6a | 2180 | pthread_mutex_unlock(&stream->lock); |
a9838785 | 2181 | pthread_mutex_unlock(&stream->chan->lock); |
ec6ea7d0 | 2182 | pthread_mutex_unlock(&stream->chan->timer_lock); |
e316aad5 | 2183 | pthread_mutex_unlock(&consumer_data.lock); |
fb3a43a9 DG |
2184 | } |
2185 | ||
8994307f DG |
2186 | /* |
2187 | * Delete data stream that are flagged for deletion (endpoint_status). | |
2188 | */ | |
2189 | static void validate_endpoint_status_data_stream(void) | |
2190 | { | |
2191 | struct lttng_ht_iter iter; | |
2192 | struct lttng_consumer_stream *stream; | |
2193 | ||
2194 | DBG("Consumer delete flagged data stream"); | |
2195 | ||
2196 | rcu_read_lock(); | |
2197 | cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) { | |
2198 | /* Validate delete flag of the stream */ | |
79d4ffb7 | 2199 | if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) { |
8994307f DG |
2200 | continue; |
2201 | } | |
2202 | /* Delete it right now */ | |
2203 | consumer_del_stream(stream, data_ht); | |
2204 | } | |
2205 | rcu_read_unlock(); | |
2206 | } | |
2207 | ||
2208 | /* | |
2209 | * Delete metadata stream that are flagged for deletion (endpoint_status). | |
2210 | */ | |
2211 | static void validate_endpoint_status_metadata_stream( | |
2212 | struct lttng_poll_event *pollset) | |
2213 | { | |
2214 | struct lttng_ht_iter iter; | |
2215 | struct lttng_consumer_stream *stream; | |
2216 | ||
2217 | DBG("Consumer delete flagged metadata stream"); | |
2218 | ||
2219 | assert(pollset); | |
2220 | ||
2221 | rcu_read_lock(); | |
2222 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) { | |
2223 | /* Validate delete flag of the stream */ | |
79d4ffb7 | 2224 | if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) { |
8994307f DG |
2225 | continue; |
2226 | } | |
2227 | /* | |
2228 | * Remove from pollset so the metadata thread can continue without | |
2229 | * blocking on a deleted stream. | |
2230 | */ | |
2231 | lttng_poll_del(pollset, stream->wait_fd); | |
2232 | ||
2233 | /* Delete it right now */ | |
2234 | consumer_del_metadata_stream(stream, metadata_ht); | |
2235 | } | |
2236 | rcu_read_unlock(); | |
2237 | } | |
2238 | ||
fb3a43a9 DG |
2239 | /* |
2240 | * Thread polls on metadata file descriptor and write them on disk or on the | |
2241 | * network. | |
2242 | */ | |
7d980def | 2243 | void *consumer_thread_metadata_poll(void *data) |
fb3a43a9 | 2244 | { |
1fc79fb4 | 2245 | int ret, i, pollfd, err = -1; |
fb3a43a9 | 2246 | uint32_t revents, nb_fd; |
e316aad5 | 2247 | struct lttng_consumer_stream *stream = NULL; |
fb3a43a9 | 2248 | struct lttng_ht_iter iter; |
d88aee68 | 2249 | struct lttng_ht_node_u64 *node; |
fb3a43a9 DG |
2250 | struct lttng_poll_event events; |
2251 | struct lttng_consumer_local_data *ctx = data; | |
2252 | ssize_t len; | |
2253 | ||
2254 | rcu_register_thread(); | |
2255 | ||
1fc79fb4 MD |
2256 | health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_METADATA); |
2257 | ||
2d57de81 MD |
2258 | if (testpoint(consumerd_thread_metadata)) { |
2259 | goto error_testpoint; | |
2260 | } | |
2261 | ||
9ce5646a MD |
2262 | health_code_update(); |
2263 | ||
fb3a43a9 DG |
2264 | DBG("Thread metadata poll started"); |
2265 | ||
fb3a43a9 DG |
2266 | /* Size is set to 1 for the consumer_metadata pipe */ |
2267 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
2268 | if (ret < 0) { | |
2269 | ERR("Poll set creation failed"); | |
d8ef542d | 2270 | goto end_poll; |
fb3a43a9 DG |
2271 | } |
2272 | ||
13886d2d DG |
2273 | ret = lttng_poll_add(&events, |
2274 | lttng_pipe_get_readfd(ctx->consumer_metadata_pipe), LPOLLIN); | |
fb3a43a9 DG |
2275 | if (ret < 0) { |
2276 | goto end; | |
2277 | } | |
2278 | ||
2279 | /* Main loop */ | |
2280 | DBG("Metadata main loop started"); | |
2281 | ||
2282 | while (1) { | |
fb3a43a9 | 2283 | restart: |
7fa2082e | 2284 | health_code_update(); |
9ce5646a | 2285 | health_poll_entry(); |
7fa2082e | 2286 | DBG("Metadata poll wait"); |
fb3a43a9 | 2287 | ret = lttng_poll_wait(&events, -1); |
7fa2082e MD |
2288 | DBG("Metadata poll return from wait with %d fd(s)", |
2289 | LTTNG_POLL_GETNB(&events)); | |
9ce5646a | 2290 | health_poll_exit(); |
40063ead | 2291 | DBG("Metadata event caught in thread"); |
fb3a43a9 DG |
2292 | if (ret < 0) { |
2293 | if (errno == EINTR) { | |
40063ead | 2294 | ERR("Poll EINTR caught"); |
fb3a43a9 DG |
2295 | goto restart; |
2296 | } | |
d9607cd7 MD |
2297 | if (LTTNG_POLL_GETNB(&events) == 0) { |
2298 | err = 0; /* All is OK */ | |
2299 | } | |
2300 | goto end; | |
fb3a43a9 DG |
2301 | } |
2302 | ||
0d9c5d77 DG |
2303 | nb_fd = ret; |
2304 | ||
e316aad5 | 2305 | /* From here, the event is a metadata wait fd */ |
fb3a43a9 | 2306 | for (i = 0; i < nb_fd; i++) { |
9ce5646a MD |
2307 | health_code_update(); |
2308 | ||
fb3a43a9 DG |
2309 | revents = LTTNG_POLL_GETEV(&events, i); |
2310 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2311 | ||
fd20dac9 MD |
2312 | if (!revents) { |
2313 | /* No activity for this FD (poll implementation). */ | |
2314 | continue; | |
2315 | } | |
2316 | ||
13886d2d | 2317 | if (pollfd == lttng_pipe_get_readfd(ctx->consumer_metadata_pipe)) { |
03e43155 | 2318 | if (revents & LPOLLIN) { |
13886d2d DG |
2319 | ssize_t pipe_len; |
2320 | ||
2321 | pipe_len = lttng_pipe_read(ctx->consumer_metadata_pipe, | |
2322 | &stream, sizeof(stream)); | |
6cd525e8 | 2323 | if (pipe_len < sizeof(stream)) { |
03e43155 MD |
2324 | if (pipe_len < 0) { |
2325 | PERROR("read metadata stream"); | |
2326 | } | |
fb3a43a9 | 2327 | /* |
03e43155 MD |
2328 | * Remove the pipe from the poll set and continue the loop |
2329 | * since their might be data to consume. | |
fb3a43a9 | 2330 | */ |
03e43155 MD |
2331 | lttng_poll_del(&events, |
2332 | lttng_pipe_get_readfd(ctx->consumer_metadata_pipe)); | |
2333 | lttng_pipe_read_close(ctx->consumer_metadata_pipe); | |
fb3a43a9 DG |
2334 | continue; |
2335 | } | |
2336 | ||
8994307f DG |
2337 | /* A NULL stream means that the state has changed. */ |
2338 | if (stream == NULL) { | |
2339 | /* Check for deleted streams. */ | |
2340 | validate_endpoint_status_metadata_stream(&events); | |
3714380f | 2341 | goto restart; |
8994307f DG |
2342 | } |
2343 | ||
fb3a43a9 DG |
2344 | DBG("Adding metadata stream %d to poll set", |
2345 | stream->wait_fd); | |
2346 | ||
fb3a43a9 DG |
2347 | /* Add metadata stream to the global poll events list */ |
2348 | lttng_poll_add(&events, stream->wait_fd, | |
6d574024 | 2349 | LPOLLIN | LPOLLPRI | LPOLLHUP); |
03e43155 MD |
2350 | } else if (revents & (LPOLLERR | LPOLLHUP)) { |
2351 | DBG("Metadata thread pipe hung up"); | |
2352 | /* | |
2353 | * Remove the pipe from the poll set and continue the loop | |
2354 | * since their might be data to consume. | |
2355 | */ | |
2356 | lttng_poll_del(&events, | |
2357 | lttng_pipe_get_readfd(ctx->consumer_metadata_pipe)); | |
2358 | lttng_pipe_read_close(ctx->consumer_metadata_pipe); | |
2359 | continue; | |
2360 | } else { | |
2361 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2362 | goto end; | |
fb3a43a9 DG |
2363 | } |
2364 | ||
e316aad5 | 2365 | /* Handle other stream */ |
fb3a43a9 DG |
2366 | continue; |
2367 | } | |
2368 | ||
d09e1200 | 2369 | rcu_read_lock(); |
d88aee68 DG |
2370 | { |
2371 | uint64_t tmp_id = (uint64_t) pollfd; | |
2372 | ||
2373 | lttng_ht_lookup(metadata_ht, &tmp_id, &iter); | |
2374 | } | |
2375 | node = lttng_ht_iter_get_node_u64(&iter); | |
e316aad5 | 2376 | assert(node); |
fb3a43a9 DG |
2377 | |
2378 | stream = caa_container_of(node, struct lttng_consumer_stream, | |
58b1f425 | 2379 | node); |
fb3a43a9 | 2380 | |
03e43155 MD |
2381 | if (revents & (LPOLLIN | LPOLLPRI)) { |
2382 | /* Get the data out of the metadata file descriptor */ | |
2383 | DBG("Metadata available on fd %d", pollfd); | |
2384 | assert(stream->wait_fd == pollfd); | |
2385 | ||
2386 | do { | |
2387 | health_code_update(); | |
2388 | ||
2389 | len = ctx->on_buffer_ready(stream, ctx); | |
2390 | /* | |
2391 | * We don't check the return value here since if we get | |
83f4233d | 2392 | * a negative len, it means an error occurred thus we |
03e43155 MD |
2393 | * simply remove it from the poll set and free the |
2394 | * stream. | |
2395 | */ | |
2396 | } while (len > 0); | |
2397 | ||
2398 | /* It's ok to have an unavailable sub-buffer */ | |
2399 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { | |
2400 | /* Clean up stream from consumer and free it. */ | |
2401 | lttng_poll_del(&events, stream->wait_fd); | |
2402 | consumer_del_metadata_stream(stream, metadata_ht); | |
2403 | } | |
2404 | } else if (revents & (LPOLLERR | LPOLLHUP)) { | |
e316aad5 | 2405 | DBG("Metadata fd %d is hup|err.", pollfd); |
fb3a43a9 DG |
2406 | if (!stream->hangup_flush_done |
2407 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
2408 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
2409 | DBG("Attempting to flush and consume the UST buffers"); | |
2410 | lttng_ustconsumer_on_stream_hangup(stream); | |
2411 | ||
2412 | /* We just flushed the stream now read it. */ | |
4bb94b75 | 2413 | do { |
9ce5646a MD |
2414 | health_code_update(); |
2415 | ||
4bb94b75 DG |
2416 | len = ctx->on_buffer_ready(stream, ctx); |
2417 | /* | |
2418 | * We don't check the return value here since if we get | |
83f4233d | 2419 | * a negative len, it means an error occurred thus we |
4bb94b75 DG |
2420 | * simply remove it from the poll set and free the |
2421 | * stream. | |
2422 | */ | |
2423 | } while (len > 0); | |
fb3a43a9 DG |
2424 | } |
2425 | ||
fb3a43a9 | 2426 | lttng_poll_del(&events, stream->wait_fd); |
e316aad5 DG |
2427 | /* |
2428 | * This call update the channel states, closes file descriptors | |
2429 | * and securely free the stream. | |
2430 | */ | |
2431 | consumer_del_metadata_stream(stream, metadata_ht); | |
03e43155 MD |
2432 | } else { |
2433 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
6f2f1a70 | 2434 | rcu_read_unlock(); |
03e43155 | 2435 | goto end; |
fb3a43a9 | 2436 | } |
e316aad5 | 2437 | /* Release RCU lock for the stream looked up */ |
d09e1200 | 2438 | rcu_read_unlock(); |
fb3a43a9 DG |
2439 | } |
2440 | } | |
2441 | ||
1fc79fb4 MD |
2442 | /* All is OK */ |
2443 | err = 0; | |
fb3a43a9 DG |
2444 | end: |
2445 | DBG("Metadata poll thread exiting"); | |
fb3a43a9 | 2446 | |
d8ef542d MD |
2447 | lttng_poll_clean(&events); |
2448 | end_poll: | |
2d57de81 | 2449 | error_testpoint: |
1fc79fb4 MD |
2450 | if (err) { |
2451 | health_error(); | |
2452 | ERR("Health error occurred in %s", __func__); | |
2453 | } | |
2454 | health_unregister(health_consumerd); | |
fb3a43a9 DG |
2455 | rcu_unregister_thread(); |
2456 | return NULL; | |
2457 | } | |
2458 | ||
3bd1e081 | 2459 | /* |
e4421fec | 2460 | * This thread polls the fds in the set to consume the data and write |
3bd1e081 MD |
2461 | * it to tracefile if necessary. |
2462 | */ | |
7d980def | 2463 | void *consumer_thread_data_poll(void *data) |
3bd1e081 | 2464 | { |
1fc79fb4 | 2465 | int num_rdy, num_hup, high_prio, ret, i, err = -1; |
3bd1e081 MD |
2466 | struct pollfd *pollfd = NULL; |
2467 | /* local view of the streams */ | |
c869f647 | 2468 | struct lttng_consumer_stream **local_stream = NULL, *new_stream = NULL; |
3bd1e081 | 2469 | /* local view of consumer_data.fds_count */ |
261de637 | 2470 | int nb_fd = 0, nb_pipes_fd; |
9a2fcf78 JD |
2471 | /* Number of FDs with CONSUMER_ENDPOINT_INACTIVE but still open. */ |
2472 | int nb_inactive_fd = 0; | |
3bd1e081 | 2473 | struct lttng_consumer_local_data *ctx = data; |
00e2e675 | 2474 | ssize_t len; |
3bd1e081 | 2475 | |
e7b994a3 DG |
2476 | rcu_register_thread(); |
2477 | ||
1fc79fb4 MD |
2478 | health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_DATA); |
2479 | ||
2d57de81 MD |
2480 | if (testpoint(consumerd_thread_data)) { |
2481 | goto error_testpoint; | |
2482 | } | |
2483 | ||
9ce5646a MD |
2484 | health_code_update(); |
2485 | ||
4df6c8cb MD |
2486 | local_stream = zmalloc(sizeof(struct lttng_consumer_stream *)); |
2487 | if (local_stream == NULL) { | |
2488 | PERROR("local_stream malloc"); | |
2489 | goto end; | |
2490 | } | |
3bd1e081 MD |
2491 | |
2492 | while (1) { | |
9ce5646a MD |
2493 | health_code_update(); |
2494 | ||
3bd1e081 MD |
2495 | high_prio = 0; |
2496 | num_hup = 0; | |
2497 | ||
2498 | /* | |
e4421fec | 2499 | * the fds set has been updated, we need to update our |
3bd1e081 MD |
2500 | * local array as well |
2501 | */ | |
2502 | pthread_mutex_lock(&consumer_data.lock); | |
2503 | if (consumer_data.need_update) { | |
0e428499 DG |
2504 | free(pollfd); |
2505 | pollfd = NULL; | |
2506 | ||
2507 | free(local_stream); | |
2508 | local_stream = NULL; | |
3bd1e081 | 2509 | |
02b3d176 | 2510 | /* |
261de637 JD |
2511 | * Allocate for all fds + 2: |
2512 | * +1 for the consumer_data_pipe | |
2513 | * +1 for wake up pipe | |
02b3d176 | 2514 | */ |
261de637 JD |
2515 | nb_pipes_fd = 2; |
2516 | pollfd = zmalloc((consumer_data.stream_count + nb_pipes_fd) * sizeof(struct pollfd)); | |
3bd1e081 | 2517 | if (pollfd == NULL) { |
7a57cf92 | 2518 | PERROR("pollfd malloc"); |
3bd1e081 MD |
2519 | pthread_mutex_unlock(&consumer_data.lock); |
2520 | goto end; | |
2521 | } | |
2522 | ||
261de637 | 2523 | local_stream = zmalloc((consumer_data.stream_count + nb_pipes_fd) * |
747f8642 | 2524 | sizeof(struct lttng_consumer_stream *)); |
3bd1e081 | 2525 | if (local_stream == NULL) { |
7a57cf92 | 2526 | PERROR("local_stream malloc"); |
3bd1e081 MD |
2527 | pthread_mutex_unlock(&consumer_data.lock); |
2528 | goto end; | |
2529 | } | |
ffe60014 | 2530 | ret = update_poll_array(ctx, &pollfd, local_stream, |
9a2fcf78 | 2531 | data_ht, &nb_inactive_fd); |
3bd1e081 MD |
2532 | if (ret < 0) { |
2533 | ERR("Error in allocating pollfd or local_outfds"); | |
f73fabfd | 2534 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
2535 | pthread_mutex_unlock(&consumer_data.lock); |
2536 | goto end; | |
2537 | } | |
2538 | nb_fd = ret; | |
2539 | consumer_data.need_update = 0; | |
2540 | } | |
2541 | pthread_mutex_unlock(&consumer_data.lock); | |
2542 | ||
4078b776 | 2543 | /* No FDs and consumer_quit, consumer_cleanup the thread */ |
9a2fcf78 JD |
2544 | if (nb_fd == 0 && nb_inactive_fd == 0 && |
2545 | CMM_LOAD_SHARED(consumer_quit) == 1) { | |
1fc79fb4 | 2546 | err = 0; /* All is OK */ |
4078b776 MD |
2547 | goto end; |
2548 | } | |
3bd1e081 | 2549 | /* poll on the array of fds */ |
88f2b785 | 2550 | restart: |
261de637 | 2551 | DBG("polling on %d fd", nb_fd + nb_pipes_fd); |
cf0bcb51 JG |
2552 | if (testpoint(consumerd_thread_data_poll)) { |
2553 | goto end; | |
2554 | } | |
9ce5646a | 2555 | health_poll_entry(); |
261de637 | 2556 | num_rdy = poll(pollfd, nb_fd + nb_pipes_fd, -1); |
9ce5646a | 2557 | health_poll_exit(); |
3bd1e081 MD |
2558 | DBG("poll num_rdy : %d", num_rdy); |
2559 | if (num_rdy == -1) { | |
88f2b785 MD |
2560 | /* |
2561 | * Restart interrupted system call. | |
2562 | */ | |
2563 | if (errno == EINTR) { | |
2564 | goto restart; | |
2565 | } | |
7a57cf92 | 2566 | PERROR("Poll error"); |
f73fabfd | 2567 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
2568 | goto end; |
2569 | } else if (num_rdy == 0) { | |
2570 | DBG("Polling thread timed out"); | |
2571 | goto end; | |
2572 | } | |
2573 | ||
80957876 JG |
2574 | if (caa_unlikely(data_consumption_paused)) { |
2575 | DBG("Data consumption paused, sleeping..."); | |
2576 | sleep(1); | |
2577 | goto restart; | |
2578 | } | |
2579 | ||
3bd1e081 | 2580 | /* |
50f8ae69 | 2581 | * If the consumer_data_pipe triggered poll go directly to the |
00e2e675 DG |
2582 | * beginning of the loop to update the array. We want to prioritize |
2583 | * array update over low-priority reads. | |
3bd1e081 | 2584 | */ |
509bb1cf | 2585 | if (pollfd[nb_fd].revents & (POLLIN | POLLPRI)) { |
ab30f567 | 2586 | ssize_t pipe_readlen; |
04fdd819 | 2587 | |
50f8ae69 | 2588 | DBG("consumer_data_pipe wake up"); |
acdb9057 DG |
2589 | pipe_readlen = lttng_pipe_read(ctx->consumer_data_pipe, |
2590 | &new_stream, sizeof(new_stream)); | |
6cd525e8 MD |
2591 | if (pipe_readlen < sizeof(new_stream)) { |
2592 | PERROR("Consumer data pipe"); | |
23f5f35d DG |
2593 | /* Continue so we can at least handle the current stream(s). */ |
2594 | continue; | |
2595 | } | |
c869f647 DG |
2596 | |
2597 | /* | |
2598 | * If the stream is NULL, just ignore it. It's also possible that | |
2599 | * the sessiond poll thread changed the consumer_quit state and is | |
2600 | * waking us up to test it. | |
2601 | */ | |
2602 | if (new_stream == NULL) { | |
8994307f | 2603 | validate_endpoint_status_data_stream(); |
c869f647 DG |
2604 | continue; |
2605 | } | |
2606 | ||
c869f647 | 2607 | /* Continue to update the local streams and handle prio ones */ |
3bd1e081 MD |
2608 | continue; |
2609 | } | |
2610 | ||
02b3d176 DG |
2611 | /* Handle wakeup pipe. */ |
2612 | if (pollfd[nb_fd + 1].revents & (POLLIN | POLLPRI)) { | |
2613 | char dummy; | |
2614 | ssize_t pipe_readlen; | |
2615 | ||
2616 | pipe_readlen = lttng_pipe_read(ctx->consumer_wakeup_pipe, &dummy, | |
2617 | sizeof(dummy)); | |
2618 | if (pipe_readlen < 0) { | |
2619 | PERROR("Consumer data wakeup pipe"); | |
2620 | } | |
2621 | /* We've been awakened to handle stream(s). */ | |
2622 | ctx->has_wakeup = 0; | |
2623 | } | |
2624 | ||
3bd1e081 MD |
2625 | /* Take care of high priority channels first. */ |
2626 | for (i = 0; i < nb_fd; i++) { | |
9ce5646a MD |
2627 | health_code_update(); |
2628 | ||
9617607b DG |
2629 | if (local_stream[i] == NULL) { |
2630 | continue; | |
2631 | } | |
fb3a43a9 | 2632 | if (pollfd[i].revents & POLLPRI) { |
d41f73b7 MD |
2633 | DBG("Urgent read on fd %d", pollfd[i].fd); |
2634 | high_prio = 1; | |
4078b776 | 2635 | len = ctx->on_buffer_ready(local_stream[i], ctx); |
d41f73b7 | 2636 | /* it's ok to have an unavailable sub-buffer */ |
b64403e3 | 2637 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2638 | /* Clean the stream and free it. */ |
2639 | consumer_del_stream(local_stream[i], data_ht); | |
9617607b | 2640 | local_stream[i] = NULL; |
4078b776 MD |
2641 | } else if (len > 0) { |
2642 | local_stream[i]->data_read = 1; | |
d41f73b7 | 2643 | } |
3bd1e081 MD |
2644 | } |
2645 | } | |
2646 | ||
4078b776 MD |
2647 | /* |
2648 | * If we read high prio channel in this loop, try again | |
2649 | * for more high prio data. | |
2650 | */ | |
2651 | if (high_prio) { | |
3bd1e081 MD |
2652 | continue; |
2653 | } | |
2654 | ||
2655 | /* Take care of low priority channels. */ | |
4078b776 | 2656 | for (i = 0; i < nb_fd; i++) { |
9ce5646a MD |
2657 | health_code_update(); |
2658 | ||
9617607b DG |
2659 | if (local_stream[i] == NULL) { |
2660 | continue; | |
2661 | } | |
4078b776 | 2662 | if ((pollfd[i].revents & POLLIN) || |
02b3d176 DG |
2663 | local_stream[i]->hangup_flush_done || |
2664 | local_stream[i]->has_data) { | |
4078b776 MD |
2665 | DBG("Normal read on fd %d", pollfd[i].fd); |
2666 | len = ctx->on_buffer_ready(local_stream[i], ctx); | |
2667 | /* it's ok to have an unavailable sub-buffer */ | |
b64403e3 | 2668 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2669 | /* Clean the stream and free it. */ |
2670 | consumer_del_stream(local_stream[i], data_ht); | |
9617607b | 2671 | local_stream[i] = NULL; |
4078b776 MD |
2672 | } else if (len > 0) { |
2673 | local_stream[i]->data_read = 1; | |
2674 | } | |
2675 | } | |
2676 | } | |
2677 | ||
2678 | /* Handle hangup and errors */ | |
2679 | for (i = 0; i < nb_fd; i++) { | |
9ce5646a MD |
2680 | health_code_update(); |
2681 | ||
9617607b DG |
2682 | if (local_stream[i] == NULL) { |
2683 | continue; | |
2684 | } | |
4078b776 MD |
2685 | if (!local_stream[i]->hangup_flush_done |
2686 | && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL)) | |
2687 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
2688 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
2689 | DBG("fd %d is hup|err|nval. Attempting flush and read.", | |
9617607b | 2690 | pollfd[i].fd); |
4078b776 MD |
2691 | lttng_ustconsumer_on_stream_hangup(local_stream[i]); |
2692 | /* Attempt read again, for the data we just flushed. */ | |
2693 | local_stream[i]->data_read = 1; | |
2694 | } | |
2695 | /* | |
2696 | * If the poll flag is HUP/ERR/NVAL and we have | |
2697 | * read no data in this pass, we can remove the | |
2698 | * stream from its hash table. | |
2699 | */ | |
2700 | if ((pollfd[i].revents & POLLHUP)) { | |
2701 | DBG("Polling fd %d tells it has hung up.", pollfd[i].fd); | |
2702 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2703 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2704 | local_stream[i] = NULL; |
4078b776 MD |
2705 | num_hup++; |
2706 | } | |
2707 | } else if (pollfd[i].revents & POLLERR) { | |
2708 | ERR("Error returned in polling fd %d.", pollfd[i].fd); | |
2709 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2710 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2711 | local_stream[i] = NULL; |
4078b776 MD |
2712 | num_hup++; |
2713 | } | |
2714 | } else if (pollfd[i].revents & POLLNVAL) { | |
2715 | ERR("Polling fd %d tells fd is not open.", pollfd[i].fd); | |
2716 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2717 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2718 | local_stream[i] = NULL; |
4078b776 | 2719 | num_hup++; |
3bd1e081 MD |
2720 | } |
2721 | } | |
9617607b DG |
2722 | if (local_stream[i] != NULL) { |
2723 | local_stream[i]->data_read = 0; | |
2724 | } | |
3bd1e081 MD |
2725 | } |
2726 | } | |
1fc79fb4 MD |
2727 | /* All is OK */ |
2728 | err = 0; | |
3bd1e081 MD |
2729 | end: |
2730 | DBG("polling thread exiting"); | |
0e428499 DG |
2731 | free(pollfd); |
2732 | free(local_stream); | |
fb3a43a9 DG |
2733 | |
2734 | /* | |
2735 | * Close the write side of the pipe so epoll_wait() in | |
7d980def DG |
2736 | * consumer_thread_metadata_poll can catch it. The thread is monitoring the |
2737 | * read side of the pipe. If we close them both, epoll_wait strangely does | |
2738 | * not return and could create a endless wait period if the pipe is the | |
2739 | * only tracked fd in the poll set. The thread will take care of closing | |
2740 | * the read side. | |
fb3a43a9 | 2741 | */ |
13886d2d | 2742 | (void) lttng_pipe_write_close(ctx->consumer_metadata_pipe); |
fb3a43a9 | 2743 | |
2d57de81 | 2744 | error_testpoint: |
1fc79fb4 MD |
2745 | if (err) { |
2746 | health_error(); | |
2747 | ERR("Health error occurred in %s", __func__); | |
2748 | } | |
2749 | health_unregister(health_consumerd); | |
2750 | ||
e7b994a3 | 2751 | rcu_unregister_thread(); |
3bd1e081 MD |
2752 | return NULL; |
2753 | } | |
2754 | ||
d8ef542d MD |
2755 | /* |
2756 | * Close wake-up end of each stream belonging to the channel. This will | |
2757 | * allow the poll() on the stream read-side to detect when the | |
2758 | * write-side (application) finally closes them. | |
2759 | */ | |
2760 | static | |
2761 | void consumer_close_channel_streams(struct lttng_consumer_channel *channel) | |
2762 | { | |
2763 | struct lttng_ht *ht; | |
2764 | struct lttng_consumer_stream *stream; | |
2765 | struct lttng_ht_iter iter; | |
2766 | ||
2767 | ht = consumer_data.stream_per_chan_id_ht; | |
2768 | ||
2769 | rcu_read_lock(); | |
2770 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
2771 | ht->hash_fct(&channel->key, lttng_ht_seed), | |
2772 | ht->match_fct, &channel->key, | |
2773 | &iter.iter, stream, node_channel_id.node) { | |
f2ad556d MD |
2774 | /* |
2775 | * Protect against teardown with mutex. | |
2776 | */ | |
2777 | pthread_mutex_lock(&stream->lock); | |
2778 | if (cds_lfht_is_node_deleted(&stream->node.node)) { | |
2779 | goto next; | |
2780 | } | |
d8ef542d MD |
2781 | switch (consumer_data.type) { |
2782 | case LTTNG_CONSUMER_KERNEL: | |
2783 | break; | |
2784 | case LTTNG_CONSUMER32_UST: | |
2785 | case LTTNG_CONSUMER64_UST: | |
b4a650f3 DG |
2786 | if (stream->metadata_flag) { |
2787 | /* Safe and protected by the stream lock. */ | |
2788 | lttng_ustconsumer_close_metadata(stream->chan); | |
2789 | } else { | |
2790 | /* | |
2791 | * Note: a mutex is taken internally within | |
2792 | * liblttng-ust-ctl to protect timer wakeup_fd | |
2793 | * use from concurrent close. | |
2794 | */ | |
2795 | lttng_ustconsumer_close_stream_wakeup(stream); | |
2796 | } | |
d8ef542d MD |
2797 | break; |
2798 | default: | |
2799 | ERR("Unknown consumer_data type"); | |
2800 | assert(0); | |
2801 | } | |
f2ad556d MD |
2802 | next: |
2803 | pthread_mutex_unlock(&stream->lock); | |
d8ef542d MD |
2804 | } |
2805 | rcu_read_unlock(); | |
2806 | } | |
2807 | ||
2808 | static void destroy_channel_ht(struct lttng_ht *ht) | |
2809 | { | |
2810 | struct lttng_ht_iter iter; | |
2811 | struct lttng_consumer_channel *channel; | |
2812 | int ret; | |
2813 | ||
2814 | if (ht == NULL) { | |
2815 | return; | |
2816 | } | |
2817 | ||
2818 | rcu_read_lock(); | |
2819 | cds_lfht_for_each_entry(ht->ht, &iter.iter, channel, wait_fd_node.node) { | |
2820 | ret = lttng_ht_del(ht, &iter); | |
2821 | assert(ret != 0); | |
2822 | } | |
2823 | rcu_read_unlock(); | |
2824 | ||
2825 | lttng_ht_destroy(ht); | |
2826 | } | |
2827 | ||
2828 | /* | |
2829 | * This thread polls the channel fds to detect when they are being | |
2830 | * closed. It closes all related streams if the channel is detected as | |
2831 | * closed. It is currently only used as a shim layer for UST because the | |
2832 | * consumerd needs to keep the per-stream wakeup end of pipes open for | |
2833 | * periodical flush. | |
2834 | */ | |
2835 | void *consumer_thread_channel_poll(void *data) | |
2836 | { | |
1fc79fb4 | 2837 | int ret, i, pollfd, err = -1; |
d8ef542d MD |
2838 | uint32_t revents, nb_fd; |
2839 | struct lttng_consumer_channel *chan = NULL; | |
2840 | struct lttng_ht_iter iter; | |
2841 | struct lttng_ht_node_u64 *node; | |
2842 | struct lttng_poll_event events; | |
2843 | struct lttng_consumer_local_data *ctx = data; | |
2844 | struct lttng_ht *channel_ht; | |
2845 | ||
2846 | rcu_register_thread(); | |
2847 | ||
1fc79fb4 MD |
2848 | health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_CHANNEL); |
2849 | ||
2d57de81 MD |
2850 | if (testpoint(consumerd_thread_channel)) { |
2851 | goto error_testpoint; | |
2852 | } | |
2853 | ||
9ce5646a MD |
2854 | health_code_update(); |
2855 | ||
d8ef542d MD |
2856 | channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
2857 | if (!channel_ht) { | |
2858 | /* ENOMEM at this point. Better to bail out. */ | |
2859 | goto end_ht; | |
2860 | } | |
2861 | ||
2862 | DBG("Thread channel poll started"); | |
2863 | ||
2864 | /* Size is set to 1 for the consumer_channel pipe */ | |
2865 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
2866 | if (ret < 0) { | |
2867 | ERR("Poll set creation failed"); | |
2868 | goto end_poll; | |
2869 | } | |
2870 | ||
2871 | ret = lttng_poll_add(&events, ctx->consumer_channel_pipe[0], LPOLLIN); | |
2872 | if (ret < 0) { | |
2873 | goto end; | |
2874 | } | |
2875 | ||
2876 | /* Main loop */ | |
2877 | DBG("Channel main loop started"); | |
2878 | ||
2879 | while (1) { | |
d8ef542d | 2880 | restart: |
7fa2082e MD |
2881 | health_code_update(); |
2882 | DBG("Channel poll wait"); | |
9ce5646a | 2883 | health_poll_entry(); |
d8ef542d | 2884 | ret = lttng_poll_wait(&events, -1); |
7fa2082e MD |
2885 | DBG("Channel poll return from wait with %d fd(s)", |
2886 | LTTNG_POLL_GETNB(&events)); | |
9ce5646a | 2887 | health_poll_exit(); |
40063ead | 2888 | DBG("Channel event caught in thread"); |
d8ef542d MD |
2889 | if (ret < 0) { |
2890 | if (errno == EINTR) { | |
40063ead | 2891 | ERR("Poll EINTR caught"); |
d8ef542d MD |
2892 | goto restart; |
2893 | } | |
d9607cd7 MD |
2894 | if (LTTNG_POLL_GETNB(&events) == 0) { |
2895 | err = 0; /* All is OK */ | |
2896 | } | |
d8ef542d MD |
2897 | goto end; |
2898 | } | |
2899 | ||
2900 | nb_fd = ret; | |
2901 | ||
2902 | /* From here, the event is a channel wait fd */ | |
2903 | for (i = 0; i < nb_fd; i++) { | |
9ce5646a MD |
2904 | health_code_update(); |
2905 | ||
d8ef542d MD |
2906 | revents = LTTNG_POLL_GETEV(&events, i); |
2907 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2908 | ||
d8ef542d | 2909 | if (!revents) { |
fd20dac9 | 2910 | /* No activity for this FD (poll implementation). */ |
d8ef542d MD |
2911 | continue; |
2912 | } | |
fd20dac9 | 2913 | |
d8ef542d | 2914 | if (pollfd == ctx->consumer_channel_pipe[0]) { |
03e43155 | 2915 | if (revents & LPOLLIN) { |
d8ef542d | 2916 | enum consumer_channel_action action; |
a0cbdd2e | 2917 | uint64_t key; |
d8ef542d | 2918 | |
a0cbdd2e | 2919 | ret = read_channel_pipe(ctx, &chan, &key, &action); |
d8ef542d | 2920 | if (ret <= 0) { |
03e43155 MD |
2921 | if (ret < 0) { |
2922 | ERR("Error reading channel pipe"); | |
2923 | } | |
2924 | lttng_poll_del(&events, ctx->consumer_channel_pipe[0]); | |
d8ef542d MD |
2925 | continue; |
2926 | } | |
2927 | ||
2928 | switch (action) { | |
2929 | case CONSUMER_CHANNEL_ADD: | |
2930 | DBG("Adding channel %d to poll set", | |
2931 | chan->wait_fd); | |
2932 | ||
2933 | lttng_ht_node_init_u64(&chan->wait_fd_node, | |
2934 | chan->wait_fd); | |
c7260a81 | 2935 | rcu_read_lock(); |
d8ef542d MD |
2936 | lttng_ht_add_unique_u64(channel_ht, |
2937 | &chan->wait_fd_node); | |
c7260a81 | 2938 | rcu_read_unlock(); |
d8ef542d MD |
2939 | /* Add channel to the global poll events list */ |
2940 | lttng_poll_add(&events, chan->wait_fd, | |
03e43155 | 2941 | LPOLLERR | LPOLLHUP); |
d8ef542d | 2942 | break; |
a0cbdd2e MD |
2943 | case CONSUMER_CHANNEL_DEL: |
2944 | { | |
b4a650f3 DG |
2945 | /* |
2946 | * This command should never be called if the channel | |
2947 | * has streams monitored by either the data or metadata | |
2948 | * thread. The consumer only notify this thread with a | |
2949 | * channel del. command if it receives a destroy | |
2950 | * channel command from the session daemon that send it | |
2951 | * if a command prior to the GET_CHANNEL failed. | |
2952 | */ | |
2953 | ||
c7260a81 | 2954 | rcu_read_lock(); |
a0cbdd2e MD |
2955 | chan = consumer_find_channel(key); |
2956 | if (!chan) { | |
c7260a81 | 2957 | rcu_read_unlock(); |
a0cbdd2e MD |
2958 | ERR("UST consumer get channel key %" PRIu64 " not found for del channel", key); |
2959 | break; | |
2960 | } | |
2961 | lttng_poll_del(&events, chan->wait_fd); | |
f623cc0b | 2962 | iter.iter.node = &chan->wait_fd_node.node; |
a0cbdd2e MD |
2963 | ret = lttng_ht_del(channel_ht, &iter); |
2964 | assert(ret == 0); | |
a0cbdd2e | 2965 | |
f2a444f1 DG |
2966 | switch (consumer_data.type) { |
2967 | case LTTNG_CONSUMER_KERNEL: | |
2968 | break; | |
2969 | case LTTNG_CONSUMER32_UST: | |
2970 | case LTTNG_CONSUMER64_UST: | |
212d67a2 DG |
2971 | health_code_update(); |
2972 | /* Destroy streams that might have been left in the stream list. */ | |
2973 | clean_channel_stream_list(chan); | |
f2a444f1 DG |
2974 | break; |
2975 | default: | |
2976 | ERR("Unknown consumer_data type"); | |
2977 | assert(0); | |
2978 | } | |
2979 | ||
a0cbdd2e MD |
2980 | /* |
2981 | * Release our own refcount. Force channel deletion even if | |
2982 | * streams were not initialized. | |
2983 | */ | |
2984 | if (!uatomic_sub_return(&chan->refcount, 1)) { | |
2985 | consumer_del_channel(chan); | |
2986 | } | |
c7260a81 | 2987 | rcu_read_unlock(); |
a0cbdd2e MD |
2988 | goto restart; |
2989 | } | |
d8ef542d MD |
2990 | case CONSUMER_CHANNEL_QUIT: |
2991 | /* | |
2992 | * Remove the pipe from the poll set and continue the loop | |
2993 | * since their might be data to consume. | |
2994 | */ | |
2995 | lttng_poll_del(&events, ctx->consumer_channel_pipe[0]); | |
2996 | continue; | |
2997 | default: | |
2998 | ERR("Unknown action"); | |
2999 | break; | |
3000 | } | |
03e43155 MD |
3001 | } else if (revents & (LPOLLERR | LPOLLHUP)) { |
3002 | DBG("Channel thread pipe hung up"); | |
3003 | /* | |
3004 | * Remove the pipe from the poll set and continue the loop | |
3005 | * since their might be data to consume. | |
3006 | */ | |
3007 | lttng_poll_del(&events, ctx->consumer_channel_pipe[0]); | |
3008 | continue; | |
3009 | } else { | |
3010 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
3011 | goto end; | |
d8ef542d MD |
3012 | } |
3013 | ||
3014 | /* Handle other stream */ | |
3015 | continue; | |
3016 | } | |
3017 | ||
3018 | rcu_read_lock(); | |
3019 | { | |
3020 | uint64_t tmp_id = (uint64_t) pollfd; | |
3021 | ||
3022 | lttng_ht_lookup(channel_ht, &tmp_id, &iter); | |
3023 | } | |
3024 | node = lttng_ht_iter_get_node_u64(&iter); | |
3025 | assert(node); | |
3026 | ||
3027 | chan = caa_container_of(node, struct lttng_consumer_channel, | |
3028 | wait_fd_node); | |
3029 | ||
3030 | /* Check for error event */ | |
3031 | if (revents & (LPOLLERR | LPOLLHUP)) { | |
3032 | DBG("Channel fd %d is hup|err.", pollfd); | |
3033 | ||
3034 | lttng_poll_del(&events, chan->wait_fd); | |
3035 | ret = lttng_ht_del(channel_ht, &iter); | |
3036 | assert(ret == 0); | |
b4a650f3 DG |
3037 | |
3038 | /* | |
3039 | * This will close the wait fd for each stream associated to | |
3040 | * this channel AND monitored by the data/metadata thread thus | |
3041 | * will be clean by the right thread. | |
3042 | */ | |
d8ef542d | 3043 | consumer_close_channel_streams(chan); |
f2ad556d MD |
3044 | |
3045 | /* Release our own refcount */ | |
3046 | if (!uatomic_sub_return(&chan->refcount, 1) | |
3047 | && !uatomic_read(&chan->nb_init_stream_left)) { | |
3048 | consumer_del_channel(chan); | |
3049 | } | |
03e43155 MD |
3050 | } else { |
3051 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
3052 | rcu_read_unlock(); | |
3053 | goto end; | |
d8ef542d MD |
3054 | } |
3055 | ||
3056 | /* Release RCU lock for the channel looked up */ | |
3057 | rcu_read_unlock(); | |
3058 | } | |
3059 | } | |
3060 | ||
1fc79fb4 MD |
3061 | /* All is OK */ |
3062 | err = 0; | |
d8ef542d MD |
3063 | end: |
3064 | lttng_poll_clean(&events); | |
3065 | end_poll: | |
3066 | destroy_channel_ht(channel_ht); | |
3067 | end_ht: | |
2d57de81 | 3068 | error_testpoint: |
d8ef542d | 3069 | DBG("Channel poll thread exiting"); |
1fc79fb4 MD |
3070 | if (err) { |
3071 | health_error(); | |
3072 | ERR("Health error occurred in %s", __func__); | |
3073 | } | |
3074 | health_unregister(health_consumerd); | |
d8ef542d MD |
3075 | rcu_unregister_thread(); |
3076 | return NULL; | |
3077 | } | |
3078 | ||
331744e3 JD |
3079 | static int set_metadata_socket(struct lttng_consumer_local_data *ctx, |
3080 | struct pollfd *sockpoll, int client_socket) | |
3081 | { | |
3082 | int ret; | |
3083 | ||
3084 | assert(ctx); | |
3085 | assert(sockpoll); | |
3086 | ||
84382d49 MD |
3087 | ret = lttng_consumer_poll_socket(sockpoll); |
3088 | if (ret) { | |
331744e3 JD |
3089 | goto error; |
3090 | } | |
3091 | DBG("Metadata connection on client_socket"); | |
3092 | ||
3093 | /* Blocking call, waiting for transmission */ | |
3094 | ctx->consumer_metadata_socket = lttcomm_accept_unix_sock(client_socket); | |
3095 | if (ctx->consumer_metadata_socket < 0) { | |
3096 | WARN("On accept metadata"); | |
3097 | ret = -1; | |
3098 | goto error; | |
3099 | } | |
3100 | ret = 0; | |
3101 | ||
3102 | error: | |
3103 | return ret; | |
3104 | } | |
3105 | ||
3bd1e081 MD |
3106 | /* |
3107 | * This thread listens on the consumerd socket and receives the file | |
3108 | * descriptors from the session daemon. | |
3109 | */ | |
7d980def | 3110 | void *consumer_thread_sessiond_poll(void *data) |
3bd1e081 | 3111 | { |
1fc79fb4 | 3112 | int sock = -1, client_socket, ret, err = -1; |
3bd1e081 MD |
3113 | /* |
3114 | * structure to poll for incoming data on communication socket avoids | |
3115 | * making blocking sockets. | |
3116 | */ | |
3117 | struct pollfd consumer_sockpoll[2]; | |
3118 | struct lttng_consumer_local_data *ctx = data; | |
3119 | ||
e7b994a3 DG |
3120 | rcu_register_thread(); |
3121 | ||
1fc79fb4 MD |
3122 | health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_SESSIOND); |
3123 | ||
2d57de81 MD |
3124 | if (testpoint(consumerd_thread_sessiond)) { |
3125 | goto error_testpoint; | |
3126 | } | |
3127 | ||
9ce5646a MD |
3128 | health_code_update(); |
3129 | ||
3bd1e081 MD |
3130 | DBG("Creating command socket %s", ctx->consumer_command_sock_path); |
3131 | unlink(ctx->consumer_command_sock_path); | |
3132 | client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path); | |
3133 | if (client_socket < 0) { | |
3134 | ERR("Cannot create command socket"); | |
3135 | goto end; | |
3136 | } | |
3137 | ||
3138 | ret = lttcomm_listen_unix_sock(client_socket); | |
3139 | if (ret < 0) { | |
3140 | goto end; | |
3141 | } | |
3142 | ||
32258573 | 3143 | DBG("Sending ready command to lttng-sessiond"); |
f73fabfd | 3144 | ret = lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_COMMAND_SOCK_READY); |
3bd1e081 MD |
3145 | /* return < 0 on error, but == 0 is not fatal */ |
3146 | if (ret < 0) { | |
32258573 | 3147 | ERR("Error sending ready command to lttng-sessiond"); |
3bd1e081 MD |
3148 | goto end; |
3149 | } | |
3150 | ||
3bd1e081 MD |
3151 | /* prepare the FDs to poll : to client socket and the should_quit pipe */ |
3152 | consumer_sockpoll[0].fd = ctx->consumer_should_quit[0]; | |
3153 | consumer_sockpoll[0].events = POLLIN | POLLPRI; | |
3154 | consumer_sockpoll[1].fd = client_socket; | |
3155 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
3156 | ||
84382d49 MD |
3157 | ret = lttng_consumer_poll_socket(consumer_sockpoll); |
3158 | if (ret) { | |
3159 | if (ret > 0) { | |
3160 | /* should exit */ | |
3161 | err = 0; | |
3162 | } | |
3bd1e081 MD |
3163 | goto end; |
3164 | } | |
3165 | DBG("Connection on client_socket"); | |
3166 | ||
3167 | /* Blocking call, waiting for transmission */ | |
3168 | sock = lttcomm_accept_unix_sock(client_socket); | |
534d2592 | 3169 | if (sock < 0) { |
3bd1e081 MD |
3170 | WARN("On accept"); |
3171 | goto end; | |
3172 | } | |
3bd1e081 | 3173 | |
331744e3 JD |
3174 | /* |
3175 | * Setup metadata socket which is the second socket connection on the | |
3176 | * command unix socket. | |
3177 | */ | |
3178 | ret = set_metadata_socket(ctx, consumer_sockpoll, client_socket); | |
84382d49 MD |
3179 | if (ret) { |
3180 | if (ret > 0) { | |
3181 | /* should exit */ | |
3182 | err = 0; | |
3183 | } | |
331744e3 JD |
3184 | goto end; |
3185 | } | |
3186 | ||
d96f09c6 DG |
3187 | /* This socket is not useful anymore. */ |
3188 | ret = close(client_socket); | |
3189 | if (ret < 0) { | |
3190 | PERROR("close client_socket"); | |
3191 | } | |
3192 | client_socket = -1; | |
3193 | ||
3bd1e081 MD |
3194 | /* update the polling structure to poll on the established socket */ |
3195 | consumer_sockpoll[1].fd = sock; | |
3196 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
3197 | ||
3198 | while (1) { | |
9ce5646a MD |
3199 | health_code_update(); |
3200 | ||
3201 | health_poll_entry(); | |
3202 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
3203 | health_poll_exit(); | |
84382d49 MD |
3204 | if (ret) { |
3205 | if (ret > 0) { | |
3206 | /* should exit */ | |
3207 | err = 0; | |
3208 | } | |
3bd1e081 MD |
3209 | goto end; |
3210 | } | |
3211 | DBG("Incoming command on sock"); | |
3212 | ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
4cbc1a04 DG |
3213 | if (ret <= 0) { |
3214 | /* | |
3215 | * This could simply be a session daemon quitting. Don't output | |
3216 | * ERR() here. | |
3217 | */ | |
3218 | DBG("Communication interrupted on command socket"); | |
41ba6035 | 3219 | err = 0; |
3bd1e081 MD |
3220 | goto end; |
3221 | } | |
10211f5c | 3222 | if (CMM_LOAD_SHARED(consumer_quit)) { |
3bd1e081 | 3223 | DBG("consumer_thread_receive_fds received quit from signal"); |
1fc79fb4 | 3224 | err = 0; /* All is OK */ |
3bd1e081 MD |
3225 | goto end; |
3226 | } | |
ffe60014 | 3227 | DBG("received command on sock"); |
3bd1e081 | 3228 | } |
1fc79fb4 MD |
3229 | /* All is OK */ |
3230 | err = 0; | |
3231 | ||
3bd1e081 | 3232 | end: |
ffe60014 | 3233 | DBG("Consumer thread sessiond poll exiting"); |
3bd1e081 | 3234 | |
d88aee68 DG |
3235 | /* |
3236 | * Close metadata streams since the producer is the session daemon which | |
3237 | * just died. | |
3238 | * | |
3239 | * NOTE: for now, this only applies to the UST tracer. | |
3240 | */ | |
6d574024 | 3241 | lttng_consumer_close_all_metadata(); |
d88aee68 | 3242 | |
3bd1e081 MD |
3243 | /* |
3244 | * when all fds have hung up, the polling thread | |
3245 | * can exit cleanly | |
3246 | */ | |
10211f5c | 3247 | CMM_STORE_SHARED(consumer_quit, 1); |
3bd1e081 | 3248 | |
04fdd819 | 3249 | /* |
c869f647 | 3250 | * Notify the data poll thread to poll back again and test the |
8994307f | 3251 | * consumer_quit state that we just set so to quit gracefully. |
04fdd819 | 3252 | */ |
acdb9057 | 3253 | notify_thread_lttng_pipe(ctx->consumer_data_pipe); |
c869f647 | 3254 | |
a0cbdd2e | 3255 | notify_channel_pipe(ctx, NULL, -1, CONSUMER_CHANNEL_QUIT); |
d8ef542d | 3256 | |
5c635c72 MD |
3257 | notify_health_quit_pipe(health_quit_pipe); |
3258 | ||
d96f09c6 DG |
3259 | /* Cleaning up possibly open sockets. */ |
3260 | if (sock >= 0) { | |
3261 | ret = close(sock); | |
3262 | if (ret < 0) { | |
3263 | PERROR("close sock sessiond poll"); | |
3264 | } | |
3265 | } | |
3266 | if (client_socket >= 0) { | |
38476d24 | 3267 | ret = close(client_socket); |
d96f09c6 DG |
3268 | if (ret < 0) { |
3269 | PERROR("close client_socket sessiond poll"); | |
3270 | } | |
3271 | } | |
3272 | ||
2d57de81 | 3273 | error_testpoint: |
1fc79fb4 MD |
3274 | if (err) { |
3275 | health_error(); | |
3276 | ERR("Health error occurred in %s", __func__); | |
3277 | } | |
3278 | health_unregister(health_consumerd); | |
3279 | ||
e7b994a3 | 3280 | rcu_unregister_thread(); |
3bd1e081 MD |
3281 | return NULL; |
3282 | } | |
d41f73b7 | 3283 | |
4078b776 | 3284 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
3285 | struct lttng_consumer_local_data *ctx) |
3286 | { | |
74251bb8 DG |
3287 | ssize_t ret; |
3288 | ||
3289 | pthread_mutex_lock(&stream->lock); | |
94d49140 JD |
3290 | if (stream->metadata_flag) { |
3291 | pthread_mutex_lock(&stream->metadata_rdv_lock); | |
3292 | } | |
74251bb8 | 3293 | |
d41f73b7 MD |
3294 | switch (consumer_data.type) { |
3295 | case LTTNG_CONSUMER_KERNEL: | |
74251bb8 DG |
3296 | ret = lttng_kconsumer_read_subbuffer(stream, ctx); |
3297 | break; | |
7753dea8 MD |
3298 | case LTTNG_CONSUMER32_UST: |
3299 | case LTTNG_CONSUMER64_UST: | |
74251bb8 DG |
3300 | ret = lttng_ustconsumer_read_subbuffer(stream, ctx); |
3301 | break; | |
d41f73b7 MD |
3302 | default: |
3303 | ERR("Unknown consumer_data type"); | |
3304 | assert(0); | |
74251bb8 DG |
3305 | ret = -ENOSYS; |
3306 | break; | |
d41f73b7 | 3307 | } |
74251bb8 | 3308 | |
94d49140 JD |
3309 | if (stream->metadata_flag) { |
3310 | pthread_cond_broadcast(&stream->metadata_rdv); | |
3311 | pthread_mutex_unlock(&stream->metadata_rdv_lock); | |
3312 | } | |
74251bb8 DG |
3313 | pthread_mutex_unlock(&stream->lock); |
3314 | return ret; | |
d41f73b7 MD |
3315 | } |
3316 | ||
3317 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
3318 | { | |
3319 | switch (consumer_data.type) { | |
3320 | case LTTNG_CONSUMER_KERNEL: | |
3321 | return lttng_kconsumer_on_recv_stream(stream); | |
7753dea8 MD |
3322 | case LTTNG_CONSUMER32_UST: |
3323 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
3324 | return lttng_ustconsumer_on_recv_stream(stream); |
3325 | default: | |
3326 | ERR("Unknown consumer_data type"); | |
3327 | assert(0); | |
3328 | return -ENOSYS; | |
3329 | } | |
3330 | } | |
e4421fec DG |
3331 | |
3332 | /* | |
3333 | * Allocate and set consumer data hash tables. | |
3334 | */ | |
282dadbc | 3335 | int lttng_consumer_init(void) |
e4421fec | 3336 | { |
d88aee68 | 3337 | consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
282dadbc MD |
3338 | if (!consumer_data.channel_ht) { |
3339 | goto error; | |
3340 | } | |
3341 | ||
d88aee68 | 3342 | consumer_data.relayd_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
282dadbc MD |
3343 | if (!consumer_data.relayd_ht) { |
3344 | goto error; | |
3345 | } | |
3346 | ||
d88aee68 | 3347 | consumer_data.stream_list_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
282dadbc MD |
3348 | if (!consumer_data.stream_list_ht) { |
3349 | goto error; | |
3350 | } | |
3351 | ||
d8ef542d | 3352 | consumer_data.stream_per_chan_id_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
282dadbc MD |
3353 | if (!consumer_data.stream_per_chan_id_ht) { |
3354 | goto error; | |
3355 | } | |
3356 | ||
3357 | data_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); | |
3358 | if (!data_ht) { | |
3359 | goto error; | |
3360 | } | |
3361 | ||
3362 | metadata_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); | |
3363 | if (!metadata_ht) { | |
3364 | goto error; | |
3365 | } | |
3366 | ||
3367 | return 0; | |
3368 | ||
3369 | error: | |
3370 | return -1; | |
e4421fec | 3371 | } |
7735ef9e DG |
3372 | |
3373 | /* | |
3374 | * Process the ADD_RELAYD command receive by a consumer. | |
3375 | * | |
3376 | * This will create a relayd socket pair and add it to the relayd hash table. | |
3377 | * The caller MUST acquire a RCU read side lock before calling it. | |
3378 | */ | |
2527bf85 | 3379 | void consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type, |
7735ef9e | 3380 | struct lttng_consumer_local_data *ctx, int sock, |
6151a90f | 3381 | struct pollfd *consumer_sockpoll, |
d3e2ba59 JD |
3382 | struct lttcomm_relayd_sock *relayd_sock, uint64_t sessiond_id, |
3383 | uint64_t relayd_session_id) | |
7735ef9e | 3384 | { |
cd2b09ed | 3385 | int fd = -1, ret = -1, relayd_created = 0; |
0c759fc9 | 3386 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
d4298c99 | 3387 | struct consumer_relayd_sock_pair *relayd = NULL; |
7735ef9e | 3388 | |
6151a90f JD |
3389 | assert(ctx); |
3390 | assert(relayd_sock); | |
3391 | ||
da009f2c | 3392 | DBG("Consumer adding relayd socket (idx: %" PRIu64 ")", net_seq_idx); |
7735ef9e DG |
3393 | |
3394 | /* Get relayd reference if exists. */ | |
3395 | relayd = consumer_find_relayd(net_seq_idx); | |
3396 | if (relayd == NULL) { | |
da009f2c | 3397 | assert(sock_type == LTTNG_STREAM_CONTROL); |
7735ef9e DG |
3398 | /* Not found. Allocate one. */ |
3399 | relayd = consumer_allocate_relayd_sock_pair(net_seq_idx); | |
3400 | if (relayd == NULL) { | |
618a6a28 MD |
3401 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; |
3402 | goto error; | |
0d08d75e | 3403 | } else { |
30319bcb | 3404 | relayd->sessiond_session_id = sessiond_id; |
0d08d75e | 3405 | relayd_created = 1; |
7735ef9e | 3406 | } |
0d08d75e DG |
3407 | |
3408 | /* | |
3409 | * This code path MUST continue to the consumer send status message to | |
3410 | * we can notify the session daemon and continue our work without | |
3411 | * killing everything. | |
3412 | */ | |
da009f2c MD |
3413 | } else { |
3414 | /* | |
3415 | * relayd key should never be found for control socket. | |
3416 | */ | |
3417 | assert(sock_type != LTTNG_STREAM_CONTROL); | |
0d08d75e DG |
3418 | } |
3419 | ||
3420 | /* First send a status message before receiving the fds. */ | |
0c759fc9 | 3421 | ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS); |
618a6a28 | 3422 | if (ret < 0) { |
0d08d75e | 3423 | /* Somehow, the session daemon is not responding anymore. */ |
618a6a28 MD |
3424 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL); |
3425 | goto error_nosignal; | |
7735ef9e DG |
3426 | } |
3427 | ||
3428 | /* Poll on consumer socket. */ | |
84382d49 MD |
3429 | ret = lttng_consumer_poll_socket(consumer_sockpoll); |
3430 | if (ret) { | |
3431 | /* Needing to exit in the middle of a command: error. */ | |
0d08d75e | 3432 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
618a6a28 | 3433 | goto error_nosignal; |
7735ef9e DG |
3434 | } |
3435 | ||
3436 | /* Get relayd socket from session daemon */ | |
3437 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); | |
3438 | if (ret != sizeof(fd)) { | |
4028eeb9 | 3439 | fd = -1; /* Just in case it gets set with an invalid value. */ |
0d08d75e DG |
3440 | |
3441 | /* | |
3442 | * Failing to receive FDs might indicate a major problem such as | |
3443 | * reaching a fd limit during the receive where the kernel returns a | |
3444 | * MSG_CTRUNC and fails to cleanup the fd in the queue. Any case, we | |
3445 | * don't take any chances and stop everything. | |
3446 | * | |
3447 | * XXX: Feature request #558 will fix that and avoid this possible | |
3448 | * issue when reaching the fd limit. | |
3449 | */ | |
3450 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); | |
618a6a28 | 3451 | ret_code = LTTCOMM_CONSUMERD_ERROR_RECV_FD; |
f50f23d9 DG |
3452 | goto error; |
3453 | } | |
3454 | ||
7735ef9e DG |
3455 | /* Copy socket information and received FD */ |
3456 | switch (sock_type) { | |
3457 | case LTTNG_STREAM_CONTROL: | |
3458 | /* Copy received lttcomm socket */ | |
6151a90f JD |
3459 | lttcomm_copy_sock(&relayd->control_sock.sock, &relayd_sock->sock); |
3460 | ret = lttcomm_create_sock(&relayd->control_sock.sock); | |
4028eeb9 | 3461 | /* Handle create_sock error. */ |
f66c074c | 3462 | if (ret < 0) { |
618a6a28 | 3463 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; |
4028eeb9 | 3464 | goto error; |
f66c074c | 3465 | } |
da009f2c MD |
3466 | /* |
3467 | * Close the socket created internally by | |
3468 | * lttcomm_create_sock, so we can replace it by the one | |
3469 | * received from sessiond. | |
3470 | */ | |
3471 | if (close(relayd->control_sock.sock.fd)) { | |
3472 | PERROR("close"); | |
3473 | } | |
7735ef9e DG |
3474 | |
3475 | /* Assign new file descriptor */ | |
6151a90f | 3476 | relayd->control_sock.sock.fd = fd; |
4b29f1ce | 3477 | fd = -1; /* For error path */ |
6151a90f JD |
3478 | /* Assign version values. */ |
3479 | relayd->control_sock.major = relayd_sock->major; | |
3480 | relayd->control_sock.minor = relayd_sock->minor; | |
c5b6f4f0 | 3481 | |
d3e2ba59 | 3482 | relayd->relayd_session_id = relayd_session_id; |
c5b6f4f0 | 3483 | |
7735ef9e DG |
3484 | break; |
3485 | case LTTNG_STREAM_DATA: | |
3486 | /* Copy received lttcomm socket */ | |
6151a90f JD |
3487 | lttcomm_copy_sock(&relayd->data_sock.sock, &relayd_sock->sock); |
3488 | ret = lttcomm_create_sock(&relayd->data_sock.sock); | |
4028eeb9 | 3489 | /* Handle create_sock error. */ |
f66c074c | 3490 | if (ret < 0) { |
618a6a28 | 3491 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; |
4028eeb9 | 3492 | goto error; |
f66c074c | 3493 | } |
da009f2c MD |
3494 | /* |
3495 | * Close the socket created internally by | |
3496 | * lttcomm_create_sock, so we can replace it by the one | |
3497 | * received from sessiond. | |
3498 | */ | |
3499 | if (close(relayd->data_sock.sock.fd)) { | |
3500 | PERROR("close"); | |
3501 | } | |
7735ef9e DG |
3502 | |
3503 | /* Assign new file descriptor */ | |
6151a90f | 3504 | relayd->data_sock.sock.fd = fd; |
4b29f1ce | 3505 | fd = -1; /* for eventual error paths */ |
6151a90f JD |
3506 | /* Assign version values. */ |
3507 | relayd->data_sock.major = relayd_sock->major; | |
3508 | relayd->data_sock.minor = relayd_sock->minor; | |
7735ef9e DG |
3509 | break; |
3510 | default: | |
3511 | ERR("Unknown relayd socket type (%d)", sock_type); | |
618a6a28 | 3512 | ret_code = LTTCOMM_CONSUMERD_FATAL; |
7735ef9e DG |
3513 | goto error; |
3514 | } | |
3515 | ||
d88aee68 | 3516 | DBG("Consumer %s socket created successfully with net idx %" PRIu64 " (fd: %d)", |
7735ef9e DG |
3517 | sock_type == LTTNG_STREAM_CONTROL ? "control" : "data", |
3518 | relayd->net_seq_idx, fd); | |
3519 | ||
618a6a28 MD |
3520 | /* We successfully added the socket. Send status back. */ |
3521 | ret = consumer_send_status_msg(sock, ret_code); | |
3522 | if (ret < 0) { | |
3523 | /* Somehow, the session daemon is not responding anymore. */ | |
3524 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL); | |
3525 | goto error_nosignal; | |
3526 | } | |
3527 | ||
7735ef9e DG |
3528 | /* |
3529 | * Add relayd socket pair to consumer data hashtable. If object already | |
3530 | * exists or on error, the function gracefully returns. | |
3531 | */ | |
d09e1200 | 3532 | add_relayd(relayd); |
7735ef9e DG |
3533 | |
3534 | /* All good! */ | |
2527bf85 | 3535 | return; |
7735ef9e DG |
3536 | |
3537 | error: | |
618a6a28 MD |
3538 | if (consumer_send_status_msg(sock, ret_code) < 0) { |
3539 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL); | |
3540 | } | |
3541 | ||
3542 | error_nosignal: | |
4028eeb9 DG |
3543 | /* Close received socket if valid. */ |
3544 | if (fd >= 0) { | |
3545 | if (close(fd)) { | |
3546 | PERROR("close received socket"); | |
3547 | } | |
3548 | } | |
cd2b09ed DG |
3549 | |
3550 | if (relayd_created) { | |
cd2b09ed DG |
3551 | free(relayd); |
3552 | } | |
7735ef9e | 3553 | } |
ca22feea | 3554 | |
4e9a4686 DG |
3555 | /* |
3556 | * Try to lock the stream mutex. | |
3557 | * | |
3558 | * On success, 1 is returned else 0 indicating that the mutex is NOT lock. | |
3559 | */ | |
3560 | static int stream_try_lock(struct lttng_consumer_stream *stream) | |
3561 | { | |
3562 | int ret; | |
3563 | ||
3564 | assert(stream); | |
3565 | ||
3566 | /* | |
3567 | * Try to lock the stream mutex. On failure, we know that the stream is | |
3568 | * being used else where hence there is data still being extracted. | |
3569 | */ | |
3570 | ret = pthread_mutex_trylock(&stream->lock); | |
3571 | if (ret) { | |
3572 | /* For both EBUSY and EINVAL error, the mutex is NOT locked. */ | |
3573 | ret = 0; | |
3574 | goto end; | |
3575 | } | |
3576 | ||
3577 | ret = 1; | |
3578 | ||
3579 | end: | |
3580 | return ret; | |
3581 | } | |
3582 | ||
f7079f67 DG |
3583 | /* |
3584 | * Search for a relayd associated to the session id and return the reference. | |
3585 | * | |
3586 | * A rcu read side lock MUST be acquire before calling this function and locked | |
3587 | * until the relayd object is no longer necessary. | |
3588 | */ | |
3589 | static struct consumer_relayd_sock_pair *find_relayd_by_session_id(uint64_t id) | |
3590 | { | |
3591 | struct lttng_ht_iter iter; | |
f7079f67 | 3592 | struct consumer_relayd_sock_pair *relayd = NULL; |
f7079f67 DG |
3593 | |
3594 | /* Iterate over all relayd since they are indexed by net_seq_idx. */ | |
3595 | cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd, | |
3596 | node.node) { | |
18261bd1 DG |
3597 | /* |
3598 | * Check by sessiond id which is unique here where the relayd session | |
3599 | * id might not be when having multiple relayd. | |
3600 | */ | |
3601 | if (relayd->sessiond_session_id == id) { | |
f7079f67 | 3602 | /* Found the relayd. There can be only one per id. */ |
18261bd1 | 3603 | goto found; |
f7079f67 DG |
3604 | } |
3605 | } | |
3606 | ||
18261bd1 DG |
3607 | return NULL; |
3608 | ||
3609 | found: | |
f7079f67 DG |
3610 | return relayd; |
3611 | } | |
3612 | ||
ca22feea DG |
3613 | /* |
3614 | * Check if for a given session id there is still data needed to be extract | |
3615 | * from the buffers. | |
3616 | * | |
6d805429 | 3617 | * Return 1 if data is pending or else 0 meaning ready to be read. |
ca22feea | 3618 | */ |
6d805429 | 3619 | int consumer_data_pending(uint64_t id) |
ca22feea DG |
3620 | { |
3621 | int ret; | |
3622 | struct lttng_ht_iter iter; | |
3623 | struct lttng_ht *ht; | |
3624 | struct lttng_consumer_stream *stream; | |
f7079f67 | 3625 | struct consumer_relayd_sock_pair *relayd = NULL; |
6d805429 | 3626 | int (*data_pending)(struct lttng_consumer_stream *); |
ca22feea | 3627 | |
6d805429 | 3628 | DBG("Consumer data pending command on session id %" PRIu64, id); |
ca22feea | 3629 | |
6f6eda74 | 3630 | rcu_read_lock(); |
ca22feea DG |
3631 | pthread_mutex_lock(&consumer_data.lock); |
3632 | ||
3633 | switch (consumer_data.type) { | |
3634 | case LTTNG_CONSUMER_KERNEL: | |
6d805429 | 3635 | data_pending = lttng_kconsumer_data_pending; |
ca22feea DG |
3636 | break; |
3637 | case LTTNG_CONSUMER32_UST: | |
3638 | case LTTNG_CONSUMER64_UST: | |
6d805429 | 3639 | data_pending = lttng_ustconsumer_data_pending; |
ca22feea DG |
3640 | break; |
3641 | default: | |
3642 | ERR("Unknown consumer data type"); | |
3643 | assert(0); | |
3644 | } | |
3645 | ||
3646 | /* Ease our life a bit */ | |
3647 | ht = consumer_data.stream_list_ht; | |
3648 | ||
f7079f67 DG |
3649 | relayd = find_relayd_by_session_id(id); |
3650 | if (relayd) { | |
3651 | /* Send init command for data pending. */ | |
3652 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
3653 | ret = relayd_begin_data_pending(&relayd->control_sock, | |
3654 | relayd->relayd_session_id); | |
3655 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
3656 | if (ret < 0) { | |
3657 | /* Communication error thus the relayd so no data pending. */ | |
3658 | goto data_not_pending; | |
3659 | } | |
3660 | } | |
3661 | ||
c8f59ee5 | 3662 | cds_lfht_for_each_entry_duplicate(ht->ht, |
d88aee68 DG |
3663 | ht->hash_fct(&id, lttng_ht_seed), |
3664 | ht->match_fct, &id, | |
ca22feea | 3665 | &iter.iter, stream, node_session_id.node) { |
4e9a4686 DG |
3666 | /* If this call fails, the stream is being used hence data pending. */ |
3667 | ret = stream_try_lock(stream); | |
3668 | if (!ret) { | |
f7079f67 | 3669 | goto data_pending; |
ca22feea | 3670 | } |
ca22feea | 3671 | |
4e9a4686 DG |
3672 | /* |
3673 | * A removed node from the hash table indicates that the stream has | |
3674 | * been deleted thus having a guarantee that the buffers are closed | |
3675 | * on the consumer side. However, data can still be transmitted | |
3676 | * over the network so don't skip the relayd check. | |
3677 | */ | |
3678 | ret = cds_lfht_is_node_deleted(&stream->node.node); | |
3679 | if (!ret) { | |
3680 | /* Check the stream if there is data in the buffers. */ | |
6d805429 DG |
3681 | ret = data_pending(stream); |
3682 | if (ret == 1) { | |
4e9a4686 | 3683 | pthread_mutex_unlock(&stream->lock); |
f7079f67 | 3684 | goto data_pending; |
4e9a4686 DG |
3685 | } |
3686 | } | |
3687 | ||
3688 | /* Relayd check */ | |
f7079f67 | 3689 | if (relayd) { |
c8f59ee5 DG |
3690 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); |
3691 | if (stream->metadata_flag) { | |
ad7051c0 DG |
3692 | ret = relayd_quiescent_control(&relayd->control_sock, |
3693 | stream->relayd_stream_id); | |
c8f59ee5 | 3694 | } else { |
6d805429 | 3695 | ret = relayd_data_pending(&relayd->control_sock, |
39df6d9f DG |
3696 | stream->relayd_stream_id, |
3697 | stream->next_net_seq_num - 1); | |
c8f59ee5 DG |
3698 | } |
3699 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
6d805429 | 3700 | if (ret == 1) { |
4e9a4686 | 3701 | pthread_mutex_unlock(&stream->lock); |
f7079f67 | 3702 | goto data_pending; |
c8f59ee5 DG |
3703 | } |
3704 | } | |
4e9a4686 | 3705 | pthread_mutex_unlock(&stream->lock); |
c8f59ee5 | 3706 | } |
ca22feea | 3707 | |
f7079f67 DG |
3708 | if (relayd) { |
3709 | unsigned int is_data_inflight = 0; | |
3710 | ||
3711 | /* Send init command for data pending. */ | |
3712 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
3713 | ret = relayd_end_data_pending(&relayd->control_sock, | |
3714 | relayd->relayd_session_id, &is_data_inflight); | |
3715 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
bdd88757 | 3716 | if (ret < 0) { |
f7079f67 DG |
3717 | goto data_not_pending; |
3718 | } | |
bdd88757 DG |
3719 | if (is_data_inflight) { |
3720 | goto data_pending; | |
3721 | } | |
f7079f67 DG |
3722 | } |
3723 | ||
ca22feea | 3724 | /* |
f7079f67 DG |
3725 | * Finding _no_ node in the hash table and no inflight data means that the |
3726 | * stream(s) have been removed thus data is guaranteed to be available for | |
3727 | * analysis from the trace files. | |
ca22feea DG |
3728 | */ |
3729 | ||
f7079f67 | 3730 | data_not_pending: |
ca22feea DG |
3731 | /* Data is available to be read by a viewer. */ |
3732 | pthread_mutex_unlock(&consumer_data.lock); | |
c8f59ee5 | 3733 | rcu_read_unlock(); |
6d805429 | 3734 | return 0; |
ca22feea | 3735 | |
f7079f67 | 3736 | data_pending: |
ca22feea DG |
3737 | /* Data is still being extracted from buffers. */ |
3738 | pthread_mutex_unlock(&consumer_data.lock); | |
c8f59ee5 | 3739 | rcu_read_unlock(); |
6d805429 | 3740 | return 1; |
ca22feea | 3741 | } |
f50f23d9 DG |
3742 | |
3743 | /* | |
3744 | * Send a ret code status message to the sessiond daemon. | |
3745 | * | |
3746 | * Return the sendmsg() return value. | |
3747 | */ | |
3748 | int consumer_send_status_msg(int sock, int ret_code) | |
3749 | { | |
3750 | struct lttcomm_consumer_status_msg msg; | |
3751 | ||
53efb85a | 3752 | memset(&msg, 0, sizeof(msg)); |
f50f23d9 DG |
3753 | msg.ret_code = ret_code; |
3754 | ||
3755 | return lttcomm_send_unix_sock(sock, &msg, sizeof(msg)); | |
3756 | } | |
ffe60014 DG |
3757 | |
3758 | /* | |
3759 | * Send a channel status message to the sessiond daemon. | |
3760 | * | |
3761 | * Return the sendmsg() return value. | |
3762 | */ | |
3763 | int consumer_send_status_channel(int sock, | |
3764 | struct lttng_consumer_channel *channel) | |
3765 | { | |
3766 | struct lttcomm_consumer_status_channel msg; | |
3767 | ||
3768 | assert(sock >= 0); | |
3769 | ||
53efb85a | 3770 | memset(&msg, 0, sizeof(msg)); |
ffe60014 | 3771 | if (!channel) { |
0c759fc9 | 3772 | msg.ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; |
ffe60014 | 3773 | } else { |
0c759fc9 | 3774 | msg.ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
ffe60014 DG |
3775 | msg.key = channel->key; |
3776 | msg.stream_count = channel->streams.count; | |
3777 | } | |
3778 | ||
3779 | return lttcomm_send_unix_sock(sock, &msg, sizeof(msg)); | |
3780 | } | |
5c786ded | 3781 | |
d07ceecd MD |
3782 | unsigned long consumer_get_consume_start_pos(unsigned long consumed_pos, |
3783 | unsigned long produced_pos, uint64_t nb_packets_per_stream, | |
3784 | uint64_t max_sb_size) | |
5c786ded | 3785 | { |
d07ceecd | 3786 | unsigned long start_pos; |
5c786ded | 3787 | |
d07ceecd MD |
3788 | if (!nb_packets_per_stream) { |
3789 | return consumed_pos; /* Grab everything */ | |
3790 | } | |
3791 | start_pos = produced_pos - offset_align_floor(produced_pos, max_sb_size); | |
3792 | start_pos -= max_sb_size * nb_packets_per_stream; | |
3793 | if ((long) (start_pos - consumed_pos) < 0) { | |
3794 | return consumed_pos; /* Grab everything */ | |
3795 | } | |
3796 | return start_pos; | |
5c786ded | 3797 | } |
a1ae2ea5 | 3798 | |
00fb02ac JD |
3799 | static |
3800 | int rotate_rename_local(const char *old_path, const char *new_path, | |
3801 | uid_t uid, gid_t gid) | |
3802 | { | |
3803 | int ret; | |
3804 | ||
3805 | assert(old_path); | |
3806 | assert(new_path); | |
3807 | ||
3808 | ret = utils_mkdir_recursive(new_path, S_IRWXU | S_IRWXG, uid, gid); | |
3809 | if (ret < 0) { | |
3810 | ERR("Create directory on rotate"); | |
3811 | goto end; | |
3812 | } | |
3813 | ||
3814 | ret = rename(old_path, new_path); | |
3815 | if (ret < 0 && errno != ENOENT) { | |
3816 | PERROR("Rename completed rotation chunk"); | |
3817 | goto end; | |
3818 | } | |
3819 | ||
3820 | ret = 0; | |
3821 | end: | |
3822 | return ret; | |
3823 | } | |
3824 | ||
3825 | static | |
3826 | int rotate_rename_relay(const char *old_path, const char *new_path, | |
3827 | uint64_t relayd_id) | |
3828 | { | |
3829 | int ret; | |
3830 | struct consumer_relayd_sock_pair *relayd; | |
3831 | ||
3832 | relayd = consumer_find_relayd(relayd_id); | |
3833 | if (!relayd) { | |
3834 | ERR("Failed to find relayd while running rotate_rename_relay command"); | |
3835 | ret = -1; | |
3836 | goto end; | |
3837 | } | |
3838 | ||
3839 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
3840 | ret = relayd_rotate_rename(&relayd->control_sock, old_path, new_path); | |
3841 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
3842 | end: | |
3843 | return ret; | |
3844 | } | |
3845 | ||
3846 | int lttng_consumer_rotate_rename(const char *old_path, const char *new_path, | |
3847 | uid_t uid, gid_t gid, uint64_t relayd_id) | |
3848 | { | |
3849 | if (relayd_id != -1ULL) { | |
3850 | return rotate_rename_relay(old_path, new_path, relayd_id); | |
3851 | } else { | |
3852 | return rotate_rename_local(old_path, new_path, uid, gid); | |
3853 | } | |
3854 | } | |
3855 | ||
a1ae2ea5 JD |
3856 | static |
3857 | int mkdir_local(const char *path, uid_t uid, gid_t gid) | |
3858 | { | |
3859 | int ret; | |
3860 | ||
3861 | ret = utils_mkdir_recursive(path, S_IRWXU | S_IRWXG, uid, gid); | |
3862 | if (ret < 0) { | |
3863 | /* utils_mkdir_recursive logs an error. */ | |
3864 | goto end; | |
3865 | } | |
3866 | ||
3867 | ret = 0; | |
3868 | end: | |
3869 | return ret; | |
3870 | } | |
3871 | ||
3872 | static | |
3873 | int mkdir_relay(const char *path, uint64_t relayd_id) | |
3874 | { | |
3875 | int ret; | |
3876 | struct consumer_relayd_sock_pair *relayd; | |
3877 | ||
3878 | relayd = consumer_find_relayd(relayd_id); | |
3879 | if (!relayd) { | |
3880 | ERR("Failed to find relayd"); | |
3881 | ret = -1; | |
3882 | goto end; | |
3883 | } | |
3884 | ||
3885 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
3886 | ret = relayd_mkdir(&relayd->control_sock, path); | |
3887 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
3888 | ||
3889 | end: | |
3890 | return ret; | |
3891 | ||
3892 | } | |
3893 | ||
3894 | int lttng_consumer_mkdir(const char *path, uid_t uid, gid_t gid, | |
3895 | uint64_t relayd_id) | |
3896 | { | |
3897 | if (relayd_id != -1ULL) { | |
3898 | return mkdir_relay(path, relayd_id); | |
3899 | } else { | |
3900 | return mkdir_local(path, uid, gid); | |
3901 | } | |
3902 | } |