Commit | Line | Data |
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3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
00e2e675 | 4 | * 2012 - David Goulet <dgoulet@efficios.com> |
3bd1e081 | 5 | * |
d14d33bf AM |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License, version 2 only, | |
8 | * as published by the Free Software Foundation. | |
3bd1e081 | 9 | * |
d14d33bf AM |
10 | * This program is distributed in the hope that it will be useful, but WITHOUT |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
3bd1e081 | 14 | * |
d14d33bf AM |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
3bd1e081 MD |
18 | */ |
19 | ||
20 | #define _GNU_SOURCE | |
21 | #include <assert.h> | |
3bd1e081 MD |
22 | #include <poll.h> |
23 | #include <pthread.h> | |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | #include <sys/mman.h> | |
27 | #include <sys/socket.h> | |
28 | #include <sys/types.h> | |
29 | #include <unistd.h> | |
77c7c900 | 30 | #include <inttypes.h> |
331744e3 | 31 | #include <signal.h> |
3bd1e081 | 32 | |
990570ed | 33 | #include <common/common.h> |
fb3a43a9 DG |
34 | #include <common/utils.h> |
35 | #include <common/compat/poll.h> | |
10a8a223 | 36 | #include <common/kernel-ctl/kernel-ctl.h> |
00e2e675 | 37 | #include <common/sessiond-comm/relayd.h> |
10a8a223 DG |
38 | #include <common/sessiond-comm/sessiond-comm.h> |
39 | #include <common/kernel-consumer/kernel-consumer.h> | |
00e2e675 | 40 | #include <common/relayd/relayd.h> |
10a8a223 DG |
41 | #include <common/ust-consumer/ust-consumer.h> |
42 | ||
43 | #include "consumer.h" | |
3bd1e081 MD |
44 | |
45 | struct lttng_consumer_global_data consumer_data = { | |
3bd1e081 MD |
46 | .stream_count = 0, |
47 | .need_update = 1, | |
48 | .type = LTTNG_CONSUMER_UNKNOWN, | |
49 | }; | |
50 | ||
d8ef542d MD |
51 | enum consumer_channel_action { |
52 | CONSUMER_CHANNEL_ADD, | |
a0cbdd2e | 53 | CONSUMER_CHANNEL_DEL, |
d8ef542d MD |
54 | CONSUMER_CHANNEL_QUIT, |
55 | }; | |
56 | ||
57 | struct consumer_channel_msg { | |
58 | enum consumer_channel_action action; | |
a0cbdd2e MD |
59 | struct lttng_consumer_channel *chan; /* add */ |
60 | uint64_t key; /* del */ | |
d8ef542d MD |
61 | }; |
62 | ||
3bd1e081 MD |
63 | /* |
64 | * Flag to inform the polling thread to quit when all fd hung up. Updated by | |
65 | * the consumer_thread_receive_fds when it notices that all fds has hung up. | |
66 | * Also updated by the signal handler (consumer_should_exit()). Read by the | |
67 | * polling threads. | |
68 | */ | |
a98dae5f | 69 | volatile int consumer_quit; |
3bd1e081 | 70 | |
43c34bc3 | 71 | /* |
43c34bc3 DG |
72 | * Global hash table containing respectively metadata and data streams. The |
73 | * stream element in this ht should only be updated by the metadata poll thread | |
74 | * for the metadata and the data poll thread for the data. | |
75 | */ | |
40dc48e0 DG |
76 | static struct lttng_ht *metadata_ht; |
77 | static struct lttng_ht *data_ht; | |
43c34bc3 | 78 | |
acdb9057 DG |
79 | /* |
80 | * Notify a thread lttng pipe to poll back again. This usually means that some | |
81 | * global state has changed so we just send back the thread in a poll wait | |
82 | * call. | |
83 | */ | |
84 | static void notify_thread_lttng_pipe(struct lttng_pipe *pipe) | |
85 | { | |
86 | struct lttng_consumer_stream *null_stream = NULL; | |
87 | ||
88 | assert(pipe); | |
89 | ||
90 | (void) lttng_pipe_write(pipe, &null_stream, sizeof(null_stream)); | |
91 | } | |
92 | ||
d8ef542d MD |
93 | static void notify_channel_pipe(struct lttng_consumer_local_data *ctx, |
94 | struct lttng_consumer_channel *chan, | |
a0cbdd2e | 95 | uint64_t key, |
d8ef542d MD |
96 | enum consumer_channel_action action) |
97 | { | |
98 | struct consumer_channel_msg msg; | |
99 | int ret; | |
100 | ||
e56251fc DG |
101 | memset(&msg, 0, sizeof(msg)); |
102 | ||
d8ef542d MD |
103 | msg.action = action; |
104 | msg.chan = chan; | |
f21dae48 | 105 | msg.key = key; |
d8ef542d MD |
106 | do { |
107 | ret = write(ctx->consumer_channel_pipe[1], &msg, sizeof(msg)); | |
108 | } while (ret < 0 && errno == EINTR); | |
109 | } | |
110 | ||
a0cbdd2e MD |
111 | void notify_thread_del_channel(struct lttng_consumer_local_data *ctx, |
112 | uint64_t key) | |
113 | { | |
114 | notify_channel_pipe(ctx, NULL, key, CONSUMER_CHANNEL_DEL); | |
115 | } | |
116 | ||
d8ef542d MD |
117 | static int read_channel_pipe(struct lttng_consumer_local_data *ctx, |
118 | struct lttng_consumer_channel **chan, | |
a0cbdd2e | 119 | uint64_t *key, |
d8ef542d MD |
120 | enum consumer_channel_action *action) |
121 | { | |
122 | struct consumer_channel_msg msg; | |
123 | int ret; | |
124 | ||
125 | do { | |
126 | ret = read(ctx->consumer_channel_pipe[0], &msg, sizeof(msg)); | |
127 | } while (ret < 0 && errno == EINTR); | |
128 | if (ret > 0) { | |
129 | *action = msg.action; | |
130 | *chan = msg.chan; | |
a0cbdd2e | 131 | *key = msg.key; |
d8ef542d MD |
132 | } |
133 | return ret; | |
134 | } | |
135 | ||
3bd1e081 MD |
136 | /* |
137 | * Find a stream. The consumer_data.lock must be locked during this | |
138 | * call. | |
139 | */ | |
d88aee68 | 140 | static struct lttng_consumer_stream *find_stream(uint64_t key, |
8389e4f8 | 141 | struct lttng_ht *ht) |
3bd1e081 | 142 | { |
e4421fec | 143 | struct lttng_ht_iter iter; |
d88aee68 | 144 | struct lttng_ht_node_u64 *node; |
e4421fec | 145 | struct lttng_consumer_stream *stream = NULL; |
3bd1e081 | 146 | |
8389e4f8 DG |
147 | assert(ht); |
148 | ||
d88aee68 DG |
149 | /* -1ULL keys are lookup failures */ |
150 | if (key == (uint64_t) -1ULL) { | |
7ad0a0cb | 151 | return NULL; |
7a57cf92 | 152 | } |
e4421fec | 153 | |
6065ceec DG |
154 | rcu_read_lock(); |
155 | ||
d88aee68 DG |
156 | lttng_ht_lookup(ht, &key, &iter); |
157 | node = lttng_ht_iter_get_node_u64(&iter); | |
e4421fec DG |
158 | if (node != NULL) { |
159 | stream = caa_container_of(node, struct lttng_consumer_stream, node); | |
3bd1e081 | 160 | } |
e4421fec | 161 | |
6065ceec DG |
162 | rcu_read_unlock(); |
163 | ||
e4421fec | 164 | return stream; |
3bd1e081 MD |
165 | } |
166 | ||
98cf381a | 167 | static void steal_stream_key(uint64_t key, struct lttng_ht *ht) |
7ad0a0cb MD |
168 | { |
169 | struct lttng_consumer_stream *stream; | |
170 | ||
04253271 | 171 | rcu_read_lock(); |
ffe60014 | 172 | stream = find_stream(key, ht); |
04253271 | 173 | if (stream) { |
98cf381a | 174 | stream->key = (uint64_t) -1ULL; |
04253271 MD |
175 | /* |
176 | * We don't want the lookup to match, but we still need | |
177 | * to iterate on this stream when iterating over the hash table. Just | |
178 | * change the node key. | |
179 | */ | |
98cf381a | 180 | stream->node.key = (uint64_t) -1ULL; |
04253271 MD |
181 | } |
182 | rcu_read_unlock(); | |
7ad0a0cb MD |
183 | } |
184 | ||
d56db448 DG |
185 | /* |
186 | * Return a channel object for the given key. | |
187 | * | |
188 | * RCU read side lock MUST be acquired before calling this function and | |
189 | * protects the channel ptr. | |
190 | */ | |
d88aee68 | 191 | struct lttng_consumer_channel *consumer_find_channel(uint64_t key) |
3bd1e081 | 192 | { |
e4421fec | 193 | struct lttng_ht_iter iter; |
d88aee68 | 194 | struct lttng_ht_node_u64 *node; |
e4421fec | 195 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 | 196 | |
d88aee68 DG |
197 | /* -1ULL keys are lookup failures */ |
198 | if (key == (uint64_t) -1ULL) { | |
7ad0a0cb | 199 | return NULL; |
7a57cf92 | 200 | } |
e4421fec | 201 | |
d88aee68 DG |
202 | lttng_ht_lookup(consumer_data.channel_ht, &key, &iter); |
203 | node = lttng_ht_iter_get_node_u64(&iter); | |
e4421fec DG |
204 | if (node != NULL) { |
205 | channel = caa_container_of(node, struct lttng_consumer_channel, node); | |
3bd1e081 | 206 | } |
e4421fec DG |
207 | |
208 | return channel; | |
3bd1e081 MD |
209 | } |
210 | ||
ffe60014 | 211 | static void free_stream_rcu(struct rcu_head *head) |
7ad0a0cb | 212 | { |
d88aee68 DG |
213 | struct lttng_ht_node_u64 *node = |
214 | caa_container_of(head, struct lttng_ht_node_u64, head); | |
ffe60014 DG |
215 | struct lttng_consumer_stream *stream = |
216 | caa_container_of(node, struct lttng_consumer_stream, node); | |
7ad0a0cb | 217 | |
ffe60014 | 218 | free(stream); |
7ad0a0cb MD |
219 | } |
220 | ||
ffe60014 | 221 | static void free_channel_rcu(struct rcu_head *head) |
702b1ea4 | 222 | { |
d88aee68 DG |
223 | struct lttng_ht_node_u64 *node = |
224 | caa_container_of(head, struct lttng_ht_node_u64, head); | |
ffe60014 DG |
225 | struct lttng_consumer_channel *channel = |
226 | caa_container_of(node, struct lttng_consumer_channel, node); | |
702b1ea4 | 227 | |
ffe60014 | 228 | free(channel); |
702b1ea4 MD |
229 | } |
230 | ||
00e2e675 DG |
231 | /* |
232 | * RCU protected relayd socket pair free. | |
233 | */ | |
ffe60014 | 234 | static void free_relayd_rcu(struct rcu_head *head) |
00e2e675 | 235 | { |
d88aee68 DG |
236 | struct lttng_ht_node_u64 *node = |
237 | caa_container_of(head, struct lttng_ht_node_u64, head); | |
00e2e675 DG |
238 | struct consumer_relayd_sock_pair *relayd = |
239 | caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
240 | ||
8994307f DG |
241 | /* |
242 | * Close all sockets. This is done in the call RCU since we don't want the | |
243 | * socket fds to be reassigned thus potentially creating bad state of the | |
244 | * relayd object. | |
245 | * | |
246 | * We do not have to lock the control socket mutex here since at this stage | |
247 | * there is no one referencing to this relayd object. | |
248 | */ | |
249 | (void) relayd_close(&relayd->control_sock); | |
250 | (void) relayd_close(&relayd->data_sock); | |
251 | ||
00e2e675 DG |
252 | free(relayd); |
253 | } | |
254 | ||
255 | /* | |
256 | * Destroy and free relayd socket pair object. | |
257 | * | |
258 | * This function MUST be called with the consumer_data lock acquired. | |
259 | */ | |
d09e1200 | 260 | static void destroy_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
261 | { |
262 | int ret; | |
263 | struct lttng_ht_iter iter; | |
264 | ||
173af62f DG |
265 | if (relayd == NULL) { |
266 | return; | |
267 | } | |
268 | ||
00e2e675 DG |
269 | DBG("Consumer destroy and close relayd socket pair"); |
270 | ||
271 | iter.iter.node = &relayd->node.node; | |
272 | ret = lttng_ht_del(consumer_data.relayd_ht, &iter); | |
173af62f | 273 | if (ret != 0) { |
8994307f | 274 | /* We assume the relayd is being or is destroyed */ |
173af62f DG |
275 | return; |
276 | } | |
00e2e675 | 277 | |
00e2e675 | 278 | /* RCU free() call */ |
ffe60014 DG |
279 | call_rcu(&relayd->node.head, free_relayd_rcu); |
280 | } | |
281 | ||
282 | /* | |
283 | * Remove a channel from the global list protected by a mutex. This function is | |
284 | * also responsible for freeing its data structures. | |
285 | */ | |
286 | void consumer_del_channel(struct lttng_consumer_channel *channel) | |
287 | { | |
288 | int ret; | |
289 | struct lttng_ht_iter iter; | |
f2a444f1 | 290 | struct lttng_consumer_stream *stream, *stmp; |
ffe60014 | 291 | |
d88aee68 | 292 | DBG("Consumer delete channel key %" PRIu64, channel->key); |
ffe60014 DG |
293 | |
294 | pthread_mutex_lock(&consumer_data.lock); | |
72c3879d | 295 | pthread_mutex_lock(&channel->lock); |
ffe60014 DG |
296 | |
297 | switch (consumer_data.type) { | |
298 | case LTTNG_CONSUMER_KERNEL: | |
299 | break; | |
300 | case LTTNG_CONSUMER32_UST: | |
301 | case LTTNG_CONSUMER64_UST: | |
f2a444f1 DG |
302 | /* Delete streams that might have been left in the stream list. */ |
303 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
304 | send_node) { | |
305 | cds_list_del(&stream->send_node); | |
306 | lttng_ustconsumer_del_stream(stream); | |
307 | free(stream); | |
308 | } | |
ffe60014 DG |
309 | lttng_ustconsumer_del_channel(channel); |
310 | break; | |
311 | default: | |
312 | ERR("Unknown consumer_data type"); | |
313 | assert(0); | |
314 | goto end; | |
315 | } | |
316 | ||
317 | rcu_read_lock(); | |
318 | iter.iter.node = &channel->node.node; | |
319 | ret = lttng_ht_del(consumer_data.channel_ht, &iter); | |
320 | assert(!ret); | |
321 | rcu_read_unlock(); | |
322 | ||
323 | call_rcu(&channel->node.head, free_channel_rcu); | |
324 | end: | |
72c3879d | 325 | pthread_mutex_unlock(&channel->lock); |
ffe60014 | 326 | pthread_mutex_unlock(&consumer_data.lock); |
00e2e675 DG |
327 | } |
328 | ||
228b5bf7 DG |
329 | /* |
330 | * Iterate over the relayd hash table and destroy each element. Finally, | |
331 | * destroy the whole hash table. | |
332 | */ | |
333 | static void cleanup_relayd_ht(void) | |
334 | { | |
335 | struct lttng_ht_iter iter; | |
336 | struct consumer_relayd_sock_pair *relayd; | |
337 | ||
338 | rcu_read_lock(); | |
339 | ||
340 | cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd, | |
341 | node.node) { | |
342 | destroy_relayd(relayd); | |
343 | } | |
344 | ||
228b5bf7 | 345 | rcu_read_unlock(); |
36b588ed MD |
346 | |
347 | lttng_ht_destroy(consumer_data.relayd_ht); | |
228b5bf7 DG |
348 | } |
349 | ||
8994307f DG |
350 | /* |
351 | * Update the end point status of all streams having the given network sequence | |
352 | * index (relayd index). | |
353 | * | |
354 | * It's atomically set without having the stream mutex locked which is fine | |
355 | * because we handle the write/read race with a pipe wakeup for each thread. | |
356 | */ | |
98cf381a | 357 | static void update_endpoint_status_by_netidx(uint64_t net_seq_idx, |
8994307f DG |
358 | enum consumer_endpoint_status status) |
359 | { | |
360 | struct lttng_ht_iter iter; | |
361 | struct lttng_consumer_stream *stream; | |
362 | ||
98cf381a | 363 | DBG("Consumer set delete flag on stream by idx %" PRIu64, net_seq_idx); |
8994307f DG |
364 | |
365 | rcu_read_lock(); | |
366 | ||
367 | /* Let's begin with metadata */ | |
368 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) { | |
369 | if (stream->net_seq_idx == net_seq_idx) { | |
370 | uatomic_set(&stream->endpoint_status, status); | |
371 | DBG("Delete flag set to metadata stream %d", stream->wait_fd); | |
372 | } | |
373 | } | |
374 | ||
375 | /* Follow up by the data streams */ | |
376 | cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) { | |
377 | if (stream->net_seq_idx == net_seq_idx) { | |
378 | uatomic_set(&stream->endpoint_status, status); | |
379 | DBG("Delete flag set to data stream %d", stream->wait_fd); | |
380 | } | |
381 | } | |
382 | rcu_read_unlock(); | |
383 | } | |
384 | ||
385 | /* | |
386 | * Cleanup a relayd object by flagging every associated streams for deletion, | |
387 | * destroying the object meaning removing it from the relayd hash table, | |
388 | * closing the sockets and freeing the memory in a RCU call. | |
389 | * | |
390 | * If a local data context is available, notify the threads that the streams' | |
391 | * state have changed. | |
392 | */ | |
393 | static void cleanup_relayd(struct consumer_relayd_sock_pair *relayd, | |
394 | struct lttng_consumer_local_data *ctx) | |
395 | { | |
98cf381a | 396 | uint64_t netidx; |
8994307f DG |
397 | |
398 | assert(relayd); | |
399 | ||
9617607b DG |
400 | DBG("Cleaning up relayd sockets"); |
401 | ||
8994307f DG |
402 | /* Save the net sequence index before destroying the object */ |
403 | netidx = relayd->net_seq_idx; | |
404 | ||
405 | /* | |
406 | * Delete the relayd from the relayd hash table, close the sockets and free | |
407 | * the object in a RCU call. | |
408 | */ | |
409 | destroy_relayd(relayd); | |
410 | ||
411 | /* Set inactive endpoint to all streams */ | |
412 | update_endpoint_status_by_netidx(netidx, CONSUMER_ENDPOINT_INACTIVE); | |
413 | ||
414 | /* | |
415 | * With a local data context, notify the threads that the streams' state | |
416 | * have changed. The write() action on the pipe acts as an "implicit" | |
417 | * memory barrier ordering the updates of the end point status from the | |
418 | * read of this status which happens AFTER receiving this notify. | |
419 | */ | |
420 | if (ctx) { | |
acdb9057 | 421 | notify_thread_lttng_pipe(ctx->consumer_data_pipe); |
13886d2d | 422 | notify_thread_lttng_pipe(ctx->consumer_metadata_pipe); |
8994307f DG |
423 | } |
424 | } | |
425 | ||
a6ba4fe1 DG |
426 | /* |
427 | * Flag a relayd socket pair for destruction. Destroy it if the refcount | |
428 | * reaches zero. | |
429 | * | |
430 | * RCU read side lock MUST be aquired before calling this function. | |
431 | */ | |
432 | void consumer_flag_relayd_for_destroy(struct consumer_relayd_sock_pair *relayd) | |
433 | { | |
434 | assert(relayd); | |
435 | ||
436 | /* Set destroy flag for this object */ | |
437 | uatomic_set(&relayd->destroy_flag, 1); | |
438 | ||
439 | /* Destroy the relayd if refcount is 0 */ | |
440 | if (uatomic_read(&relayd->refcount) == 0) { | |
d09e1200 | 441 | destroy_relayd(relayd); |
a6ba4fe1 DG |
442 | } |
443 | } | |
444 | ||
3bd1e081 MD |
445 | /* |
446 | * Remove a stream from the global list protected by a mutex. This | |
447 | * function is also responsible for freeing its data structures. | |
448 | */ | |
e316aad5 DG |
449 | void consumer_del_stream(struct lttng_consumer_stream *stream, |
450 | struct lttng_ht *ht) | |
3bd1e081 MD |
451 | { |
452 | int ret; | |
e4421fec | 453 | struct lttng_ht_iter iter; |
3bd1e081 | 454 | struct lttng_consumer_channel *free_chan = NULL; |
00e2e675 DG |
455 | struct consumer_relayd_sock_pair *relayd; |
456 | ||
457 | assert(stream); | |
3bd1e081 | 458 | |
8994307f DG |
459 | DBG("Consumer del stream %d", stream->wait_fd); |
460 | ||
e316aad5 DG |
461 | if (ht == NULL) { |
462 | /* Means the stream was allocated but not successfully added */ | |
ffe60014 | 463 | goto free_stream_rcu; |
e316aad5 DG |
464 | } |
465 | ||
3bd1e081 | 466 | pthread_mutex_lock(&consumer_data.lock); |
74251bb8 | 467 | pthread_mutex_lock(&stream->lock); |
3bd1e081 MD |
468 | |
469 | switch (consumer_data.type) { | |
470 | case LTTNG_CONSUMER_KERNEL: | |
471 | if (stream->mmap_base != NULL) { | |
472 | ret = munmap(stream->mmap_base, stream->mmap_len); | |
473 | if (ret != 0) { | |
7a57cf92 | 474 | PERROR("munmap"); |
3bd1e081 MD |
475 | } |
476 | } | |
4c95e622 JD |
477 | |
478 | if (stream->wait_fd >= 0) { | |
479 | ret = close(stream->wait_fd); | |
480 | if (ret) { | |
481 | PERROR("close"); | |
482 | } | |
483 | } | |
3bd1e081 | 484 | break; |
7753dea8 MD |
485 | case LTTNG_CONSUMER32_UST: |
486 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
487 | lttng_ustconsumer_del_stream(stream); |
488 | break; | |
489 | default: | |
490 | ERR("Unknown consumer_data type"); | |
491 | assert(0); | |
492 | goto end; | |
493 | } | |
494 | ||
6065ceec | 495 | rcu_read_lock(); |
04253271 | 496 | iter.iter.node = &stream->node.node; |
e316aad5 | 497 | ret = lttng_ht_del(ht, &iter); |
04253271 | 498 | assert(!ret); |
ca22feea | 499 | |
d8ef542d MD |
500 | iter.iter.node = &stream->node_channel_id.node; |
501 | ret = lttng_ht_del(consumer_data.stream_per_chan_id_ht, &iter); | |
502 | assert(!ret); | |
503 | ||
ca22feea DG |
504 | iter.iter.node = &stream->node_session_id.node; |
505 | ret = lttng_ht_del(consumer_data.stream_list_ht, &iter); | |
506 | assert(!ret); | |
6065ceec DG |
507 | rcu_read_unlock(); |
508 | ||
50f8ae69 | 509 | assert(consumer_data.stream_count > 0); |
3bd1e081 | 510 | consumer_data.stream_count--; |
50f8ae69 | 511 | |
3bd1e081 | 512 | if (stream->out_fd >= 0) { |
4c462e79 MD |
513 | ret = close(stream->out_fd); |
514 | if (ret) { | |
515 | PERROR("close"); | |
516 | } | |
3bd1e081 | 517 | } |
00e2e675 DG |
518 | |
519 | /* Check and cleanup relayd */ | |
b0b335c8 | 520 | rcu_read_lock(); |
00e2e675 DG |
521 | relayd = consumer_find_relayd(stream->net_seq_idx); |
522 | if (relayd != NULL) { | |
b0b335c8 MD |
523 | uatomic_dec(&relayd->refcount); |
524 | assert(uatomic_read(&relayd->refcount) >= 0); | |
173af62f | 525 | |
3f8e211f DG |
526 | /* Closing streams requires to lock the control socket. */ |
527 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
173af62f DG |
528 | ret = relayd_send_close_stream(&relayd->control_sock, |
529 | stream->relayd_stream_id, | |
530 | stream->next_net_seq_num - 1); | |
3f8e211f | 531 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); |
173af62f | 532 | if (ret < 0) { |
a4b92340 DG |
533 | DBG("Unable to close stream on the relayd. Continuing"); |
534 | /* | |
535 | * Continue here. There is nothing we can do for the relayd. | |
536 | * Chances are that the relayd has closed the socket so we just | |
537 | * continue cleaning up. | |
538 | */ | |
173af62f DG |
539 | } |
540 | ||
541 | /* Both conditions are met, we destroy the relayd. */ | |
542 | if (uatomic_read(&relayd->refcount) == 0 && | |
543 | uatomic_read(&relayd->destroy_flag)) { | |
d09e1200 | 544 | destroy_relayd(relayd); |
00e2e675 | 545 | } |
00e2e675 | 546 | } |
b0b335c8 | 547 | rcu_read_unlock(); |
00e2e675 | 548 | |
f2ad556d | 549 | if (!uatomic_sub_return(&stream->chan->refcount, 1) |
ffe60014 | 550 | && !uatomic_read(&stream->chan->nb_init_stream_left)) { |
3bd1e081 | 551 | free_chan = stream->chan; |
00e2e675 DG |
552 | } |
553 | ||
3bd1e081 MD |
554 | end: |
555 | consumer_data.need_update = 1; | |
8994307f | 556 | pthread_mutex_unlock(&stream->lock); |
74251bb8 | 557 | pthread_mutex_unlock(&consumer_data.lock); |
3bd1e081 | 558 | |
c30aaa51 | 559 | if (free_chan) { |
3bd1e081 | 560 | consumer_del_channel(free_chan); |
c30aaa51 | 561 | } |
e316aad5 | 562 | |
ffe60014 DG |
563 | free_stream_rcu: |
564 | call_rcu(&stream->node.head, free_stream_rcu); | |
3bd1e081 MD |
565 | } |
566 | ||
155e9bb8 MD |
567 | /* |
568 | * XXX naming of del vs destroy is all mixed up. | |
569 | */ | |
570 | void consumer_del_stream_for_data(struct lttng_consumer_stream *stream) | |
571 | { | |
572 | consumer_del_stream(stream, data_ht); | |
573 | } | |
574 | ||
575 | void consumer_del_stream_for_metadata(struct lttng_consumer_stream *stream) | |
576 | { | |
577 | consumer_del_stream(stream, metadata_ht); | |
578 | } | |
579 | ||
d88aee68 DG |
580 | struct lttng_consumer_stream *consumer_allocate_stream(uint64_t channel_key, |
581 | uint64_t stream_key, | |
3bd1e081 | 582 | enum lttng_consumer_stream_state state, |
ffe60014 | 583 | const char *channel_name, |
6df2e2c9 | 584 | uid_t uid, |
00e2e675 | 585 | gid_t gid, |
57a269f2 | 586 | uint64_t relayd_id, |
53632229 | 587 | uint64_t session_id, |
ffe60014 DG |
588 | int cpu, |
589 | int *alloc_ret, | |
590 | enum consumer_channel_type type) | |
3bd1e081 | 591 | { |
ffe60014 | 592 | int ret; |
3bd1e081 | 593 | struct lttng_consumer_stream *stream; |
3bd1e081 | 594 | |
effcf122 | 595 | stream = zmalloc(sizeof(*stream)); |
3bd1e081 | 596 | if (stream == NULL) { |
7a57cf92 | 597 | PERROR("malloc struct lttng_consumer_stream"); |
ffe60014 | 598 | ret = -ENOMEM; |
7a57cf92 | 599 | goto end; |
3bd1e081 | 600 | } |
7a57cf92 | 601 | |
d56db448 DG |
602 | rcu_read_lock(); |
603 | ||
3bd1e081 | 604 | stream->key = stream_key; |
3bd1e081 MD |
605 | stream->out_fd = -1; |
606 | stream->out_fd_offset = 0; | |
6d67e4b4 | 607 | stream->output_written = 0; |
3bd1e081 | 608 | stream->state = state; |
6df2e2c9 MD |
609 | stream->uid = uid; |
610 | stream->gid = gid; | |
ffe60014 | 611 | stream->net_seq_idx = relayd_id; |
53632229 | 612 | stream->session_id = session_id; |
bf9abc51 | 613 | stream->endpoint_status = CONSUMER_ENDPOINT_ACTIVE; |
53632229 | 614 | pthread_mutex_init(&stream->lock, NULL); |
58b1f425 | 615 | |
ffe60014 DG |
616 | /* If channel is the metadata, flag this stream as metadata. */ |
617 | if (type == CONSUMER_CHANNEL_TYPE_METADATA) { | |
618 | stream->metadata_flag = 1; | |
619 | /* Metadata is flat out. */ | |
620 | strncpy(stream->name, DEFAULT_METADATA_NAME, sizeof(stream->name)); | |
58b1f425 | 621 | } else { |
ffe60014 DG |
622 | /* Format stream name to <channel_name>_<cpu_number> */ |
623 | ret = snprintf(stream->name, sizeof(stream->name), "%s_%d", | |
624 | channel_name, cpu); | |
625 | if (ret < 0) { | |
626 | PERROR("snprintf stream name"); | |
627 | goto error; | |
628 | } | |
58b1f425 | 629 | } |
c30aaa51 | 630 | |
ffe60014 | 631 | /* Key is always the wait_fd for streams. */ |
d88aee68 | 632 | lttng_ht_node_init_u64(&stream->node, stream->key); |
ffe60014 | 633 | |
d8ef542d MD |
634 | /* Init node per channel id key */ |
635 | lttng_ht_node_init_u64(&stream->node_channel_id, channel_key); | |
636 | ||
53632229 | 637 | /* Init session id node with the stream session id */ |
d88aee68 | 638 | lttng_ht_node_init_u64(&stream->node_session_id, stream->session_id); |
53632229 | 639 | |
d8ef542d MD |
640 | DBG3("Allocated stream %s (key %" PRIu64 ", chan_key %" PRIu64 " relayd_id %" PRIu64 ", session_id %" PRIu64, |
641 | stream->name, stream->key, channel_key, stream->net_seq_idx, stream->session_id); | |
d56db448 DG |
642 | |
643 | rcu_read_unlock(); | |
3bd1e081 | 644 | return stream; |
c80048c6 MD |
645 | |
646 | error: | |
d56db448 | 647 | rcu_read_unlock(); |
c80048c6 | 648 | free(stream); |
7a57cf92 | 649 | end: |
ffe60014 DG |
650 | if (alloc_ret) { |
651 | *alloc_ret = ret; | |
652 | } | |
c80048c6 | 653 | return NULL; |
3bd1e081 MD |
654 | } |
655 | ||
656 | /* | |
657 | * Add a stream to the global list protected by a mutex. | |
658 | */ | |
155e9bb8 | 659 | int consumer_add_data_stream(struct lttng_consumer_stream *stream) |
3bd1e081 | 660 | { |
155e9bb8 | 661 | struct lttng_ht *ht = data_ht; |
3bd1e081 | 662 | int ret = 0; |
00e2e675 | 663 | struct consumer_relayd_sock_pair *relayd; |
3bd1e081 | 664 | |
e316aad5 | 665 | assert(stream); |
43c34bc3 | 666 | assert(ht); |
c77fc10a | 667 | |
d88aee68 | 668 | DBG3("Adding consumer stream %" PRIu64, stream->key); |
e316aad5 DG |
669 | |
670 | pthread_mutex_lock(&consumer_data.lock); | |
72c3879d | 671 | pthread_mutex_lock(&stream->chan->lock); |
6ca1a6b0 | 672 | pthread_mutex_lock(&stream->chan->timer_lock); |
2e818a6a | 673 | pthread_mutex_lock(&stream->lock); |
b0b335c8 | 674 | rcu_read_lock(); |
e316aad5 | 675 | |
43c34bc3 | 676 | /* Steal stream identifier to avoid having streams with the same key */ |
ffe60014 | 677 | steal_stream_key(stream->key, ht); |
43c34bc3 | 678 | |
d88aee68 | 679 | lttng_ht_add_unique_u64(ht, &stream->node); |
00e2e675 | 680 | |
d8ef542d MD |
681 | lttng_ht_add_u64(consumer_data.stream_per_chan_id_ht, |
682 | &stream->node_channel_id); | |
683 | ||
ca22feea DG |
684 | /* |
685 | * Add stream to the stream_list_ht of the consumer data. No need to steal | |
686 | * the key since the HT does not use it and we allow to add redundant keys | |
687 | * into this table. | |
688 | */ | |
d88aee68 | 689 | lttng_ht_add_u64(consumer_data.stream_list_ht, &stream->node_session_id); |
ca22feea | 690 | |
00e2e675 DG |
691 | /* Check and cleanup relayd */ |
692 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
693 | if (relayd != NULL) { | |
b0b335c8 | 694 | uatomic_inc(&relayd->refcount); |
00e2e675 DG |
695 | } |
696 | ||
e316aad5 | 697 | /* |
ffe60014 DG |
698 | * When nb_init_stream_left reaches 0, we don't need to trigger any action |
699 | * in terms of destroying the associated channel, because the action that | |
e316aad5 DG |
700 | * causes the count to become 0 also causes a stream to be added. The |
701 | * channel deletion will thus be triggered by the following removal of this | |
702 | * stream. | |
703 | */ | |
ffe60014 | 704 | if (uatomic_read(&stream->chan->nb_init_stream_left) > 0) { |
f2ad556d MD |
705 | /* Increment refcount before decrementing nb_init_stream_left */ |
706 | cmm_smp_wmb(); | |
ffe60014 | 707 | uatomic_dec(&stream->chan->nb_init_stream_left); |
e316aad5 DG |
708 | } |
709 | ||
710 | /* Update consumer data once the node is inserted. */ | |
3bd1e081 MD |
711 | consumer_data.stream_count++; |
712 | consumer_data.need_update = 1; | |
713 | ||
e316aad5 | 714 | rcu_read_unlock(); |
2e818a6a | 715 | pthread_mutex_unlock(&stream->lock); |
6ca1a6b0 | 716 | pthread_mutex_unlock(&stream->chan->timer_lock); |
72c3879d | 717 | pthread_mutex_unlock(&stream->chan->lock); |
3bd1e081 | 718 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 719 | |
3bd1e081 MD |
720 | return ret; |
721 | } | |
722 | ||
155e9bb8 MD |
723 | void consumer_del_data_stream(struct lttng_consumer_stream *stream) |
724 | { | |
725 | consumer_del_stream(stream, data_ht); | |
726 | } | |
727 | ||
00e2e675 | 728 | /* |
3f8e211f DG |
729 | * Add relayd socket to global consumer data hashtable. RCU read side lock MUST |
730 | * be acquired before calling this. | |
00e2e675 | 731 | */ |
d09e1200 | 732 | static int add_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
733 | { |
734 | int ret = 0; | |
d88aee68 | 735 | struct lttng_ht_node_u64 *node; |
00e2e675 DG |
736 | struct lttng_ht_iter iter; |
737 | ||
ffe60014 | 738 | assert(relayd); |
00e2e675 | 739 | |
00e2e675 | 740 | lttng_ht_lookup(consumer_data.relayd_ht, |
d88aee68 DG |
741 | &relayd->net_seq_idx, &iter); |
742 | node = lttng_ht_iter_get_node_u64(&iter); | |
00e2e675 | 743 | if (node != NULL) { |
00e2e675 DG |
744 | goto end; |
745 | } | |
d88aee68 | 746 | lttng_ht_add_unique_u64(consumer_data.relayd_ht, &relayd->node); |
00e2e675 | 747 | |
00e2e675 DG |
748 | end: |
749 | return ret; | |
750 | } | |
751 | ||
752 | /* | |
753 | * Allocate and return a consumer relayd socket. | |
754 | */ | |
755 | struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair( | |
98cf381a | 756 | uint64_t net_seq_idx) |
00e2e675 DG |
757 | { |
758 | struct consumer_relayd_sock_pair *obj = NULL; | |
759 | ||
98cf381a MD |
760 | /* net sequence index of -1 is a failure */ |
761 | if (net_seq_idx == (uint64_t) -1ULL) { | |
00e2e675 DG |
762 | goto error; |
763 | } | |
764 | ||
765 | obj = zmalloc(sizeof(struct consumer_relayd_sock_pair)); | |
766 | if (obj == NULL) { | |
767 | PERROR("zmalloc relayd sock"); | |
768 | goto error; | |
769 | } | |
770 | ||
771 | obj->net_seq_idx = net_seq_idx; | |
772 | obj->refcount = 0; | |
173af62f | 773 | obj->destroy_flag = 0; |
f96e4545 MD |
774 | obj->control_sock.sock.fd = -1; |
775 | obj->data_sock.sock.fd = -1; | |
d88aee68 | 776 | lttng_ht_node_init_u64(&obj->node, obj->net_seq_idx); |
00e2e675 DG |
777 | pthread_mutex_init(&obj->ctrl_sock_mutex, NULL); |
778 | ||
779 | error: | |
780 | return obj; | |
781 | } | |
782 | ||
783 | /* | |
784 | * Find a relayd socket pair in the global consumer data. | |
785 | * | |
786 | * Return the object if found else NULL. | |
b0b335c8 MD |
787 | * RCU read-side lock must be held across this call and while using the |
788 | * returned object. | |
00e2e675 | 789 | */ |
d88aee68 | 790 | struct consumer_relayd_sock_pair *consumer_find_relayd(uint64_t key) |
00e2e675 DG |
791 | { |
792 | struct lttng_ht_iter iter; | |
d88aee68 | 793 | struct lttng_ht_node_u64 *node; |
00e2e675 DG |
794 | struct consumer_relayd_sock_pair *relayd = NULL; |
795 | ||
796 | /* Negative keys are lookup failures */ | |
d88aee68 | 797 | if (key == (uint64_t) -1ULL) { |
00e2e675 DG |
798 | goto error; |
799 | } | |
800 | ||
d88aee68 | 801 | lttng_ht_lookup(consumer_data.relayd_ht, &key, |
00e2e675 | 802 | &iter); |
d88aee68 | 803 | node = lttng_ht_iter_get_node_u64(&iter); |
00e2e675 DG |
804 | if (node != NULL) { |
805 | relayd = caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
806 | } | |
807 | ||
00e2e675 DG |
808 | error: |
809 | return relayd; | |
810 | } | |
811 | ||
812 | /* | |
813 | * Handle stream for relayd transmission if the stream applies for network | |
814 | * streaming where the net sequence index is set. | |
815 | * | |
816 | * Return destination file descriptor or negative value on error. | |
817 | */ | |
6197aea7 | 818 | static int write_relayd_stream_header(struct lttng_consumer_stream *stream, |
1d4dfdef DG |
819 | size_t data_size, unsigned long padding, |
820 | struct consumer_relayd_sock_pair *relayd) | |
00e2e675 DG |
821 | { |
822 | int outfd = -1, ret; | |
00e2e675 DG |
823 | struct lttcomm_relayd_data_hdr data_hdr; |
824 | ||
825 | /* Safety net */ | |
826 | assert(stream); | |
6197aea7 | 827 | assert(relayd); |
00e2e675 DG |
828 | |
829 | /* Reset data header */ | |
830 | memset(&data_hdr, 0, sizeof(data_hdr)); | |
831 | ||
00e2e675 DG |
832 | if (stream->metadata_flag) { |
833 | /* Caller MUST acquire the relayd control socket lock */ | |
834 | ret = relayd_send_metadata(&relayd->control_sock, data_size); | |
835 | if (ret < 0) { | |
836 | goto error; | |
837 | } | |
838 | ||
839 | /* Metadata are always sent on the control socket. */ | |
6151a90f | 840 | outfd = relayd->control_sock.sock.fd; |
00e2e675 DG |
841 | } else { |
842 | /* Set header with stream information */ | |
843 | data_hdr.stream_id = htobe64(stream->relayd_stream_id); | |
844 | data_hdr.data_size = htobe32(data_size); | |
1d4dfdef | 845 | data_hdr.padding_size = htobe32(padding); |
39df6d9f DG |
846 | /* |
847 | * Note that net_seq_num below is assigned with the *current* value of | |
848 | * next_net_seq_num and only after that the next_net_seq_num will be | |
849 | * increment. This is why when issuing a command on the relayd using | |
850 | * this next value, 1 should always be substracted in order to compare | |
851 | * the last seen sequence number on the relayd side to the last sent. | |
852 | */ | |
3604f373 | 853 | data_hdr.net_seq_num = htobe64(stream->next_net_seq_num); |
00e2e675 DG |
854 | /* Other fields are zeroed previously */ |
855 | ||
856 | ret = relayd_send_data_hdr(&relayd->data_sock, &data_hdr, | |
857 | sizeof(data_hdr)); | |
858 | if (ret < 0) { | |
859 | goto error; | |
860 | } | |
861 | ||
3604f373 DG |
862 | ++stream->next_net_seq_num; |
863 | ||
00e2e675 | 864 | /* Set to go on data socket */ |
6151a90f | 865 | outfd = relayd->data_sock.sock.fd; |
00e2e675 DG |
866 | } |
867 | ||
868 | error: | |
869 | return outfd; | |
870 | } | |
871 | ||
3bd1e081 | 872 | /* |
ffe60014 DG |
873 | * Allocate and return a new lttng_consumer_channel object using the given key |
874 | * to initialize the hash table node. | |
875 | * | |
876 | * On error, return NULL. | |
3bd1e081 | 877 | */ |
886224ff | 878 | struct lttng_consumer_channel *consumer_allocate_channel(uint64_t key, |
ffe60014 DG |
879 | uint64_t session_id, |
880 | const char *pathname, | |
881 | const char *name, | |
882 | uid_t uid, | |
883 | gid_t gid, | |
57a269f2 | 884 | uint64_t relayd_id, |
1624d5b7 JD |
885 | enum lttng_event_output output, |
886 | uint64_t tracefile_size, | |
cb7c6909 JD |
887 | uint64_t tracefile_count, |
888 | uint64_t session_id_per_pid) | |
3bd1e081 MD |
889 | { |
890 | struct lttng_consumer_channel *channel; | |
3bd1e081 | 891 | |
276b26d1 | 892 | channel = zmalloc(sizeof(*channel)); |
3bd1e081 | 893 | if (channel == NULL) { |
7a57cf92 | 894 | PERROR("malloc struct lttng_consumer_channel"); |
3bd1e081 MD |
895 | goto end; |
896 | } | |
ffe60014 DG |
897 | |
898 | channel->key = key; | |
3bd1e081 | 899 | channel->refcount = 0; |
ffe60014 | 900 | channel->session_id = session_id; |
cb7c6909 | 901 | channel->session_id_per_pid = session_id_per_pid; |
ffe60014 DG |
902 | channel->uid = uid; |
903 | channel->gid = gid; | |
904 | channel->relayd_id = relayd_id; | |
905 | channel->output = output; | |
1624d5b7 JD |
906 | channel->tracefile_size = tracefile_size; |
907 | channel->tracefile_count = tracefile_count; | |
72c3879d | 908 | pthread_mutex_init(&channel->lock, NULL); |
6ca1a6b0 | 909 | pthread_mutex_init(&channel->timer_lock, NULL); |
ffe60014 DG |
910 | |
911 | strncpy(channel->pathname, pathname, sizeof(channel->pathname)); | |
912 | channel->pathname[sizeof(channel->pathname) - 1] = '\0'; | |
913 | ||
914 | strncpy(channel->name, name, sizeof(channel->name)); | |
915 | channel->name[sizeof(channel->name) - 1] = '\0'; | |
916 | ||
d88aee68 | 917 | lttng_ht_node_init_u64(&channel->node, channel->key); |
d8ef542d MD |
918 | |
919 | channel->wait_fd = -1; | |
920 | ||
ffe60014 DG |
921 | CDS_INIT_LIST_HEAD(&channel->streams.head); |
922 | ||
d88aee68 | 923 | DBG("Allocated channel (key %" PRIu64 ")", channel->key) |
3bd1e081 | 924 | |
3bd1e081 MD |
925 | end: |
926 | return channel; | |
927 | } | |
928 | ||
929 | /* | |
930 | * Add a channel to the global list protected by a mutex. | |
821fffb2 DG |
931 | * |
932 | * On success 0 is returned else a negative value. | |
3bd1e081 | 933 | */ |
d8ef542d MD |
934 | int consumer_add_channel(struct lttng_consumer_channel *channel, |
935 | struct lttng_consumer_local_data *ctx) | |
3bd1e081 | 936 | { |
ffe60014 | 937 | int ret = 0; |
d88aee68 | 938 | struct lttng_ht_node_u64 *node; |
c77fc10a DG |
939 | struct lttng_ht_iter iter; |
940 | ||
3bd1e081 | 941 | pthread_mutex_lock(&consumer_data.lock); |
72c3879d | 942 | pthread_mutex_lock(&channel->lock); |
6ca1a6b0 | 943 | pthread_mutex_lock(&channel->timer_lock); |
6065ceec | 944 | rcu_read_lock(); |
c77fc10a | 945 | |
7972aab2 | 946 | lttng_ht_lookup(consumer_data.channel_ht, &channel->key, &iter); |
d88aee68 | 947 | node = lttng_ht_iter_get_node_u64(&iter); |
c77fc10a DG |
948 | if (node != NULL) { |
949 | /* Channel already exist. Ignore the insertion */ | |
d88aee68 DG |
950 | ERR("Consumer add channel key %" PRIu64 " already exists!", |
951 | channel->key); | |
821fffb2 | 952 | ret = -EEXIST; |
c77fc10a DG |
953 | goto end; |
954 | } | |
955 | ||
d88aee68 | 956 | lttng_ht_add_unique_u64(consumer_data.channel_ht, &channel->node); |
c77fc10a DG |
957 | |
958 | end: | |
6065ceec | 959 | rcu_read_unlock(); |
6ca1a6b0 | 960 | pthread_mutex_unlock(&channel->timer_lock); |
72c3879d | 961 | pthread_mutex_unlock(&channel->lock); |
3bd1e081 | 962 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 963 | |
d8ef542d MD |
964 | if (!ret && channel->wait_fd != -1 && |
965 | channel->metadata_stream == NULL) { | |
a0cbdd2e | 966 | notify_channel_pipe(ctx, channel, -1, CONSUMER_CHANNEL_ADD); |
d8ef542d | 967 | } |
ffe60014 | 968 | return ret; |
3bd1e081 MD |
969 | } |
970 | ||
971 | /* | |
972 | * Allocate the pollfd structure and the local view of the out fds to avoid | |
973 | * doing a lookup in the linked list and concurrency issues when writing is | |
974 | * needed. Called with consumer_data.lock held. | |
975 | * | |
976 | * Returns the number of fds in the structures. | |
977 | */ | |
ffe60014 DG |
978 | static int update_poll_array(struct lttng_consumer_local_data *ctx, |
979 | struct pollfd **pollfd, struct lttng_consumer_stream **local_stream, | |
980 | struct lttng_ht *ht) | |
3bd1e081 | 981 | { |
3bd1e081 | 982 | int i = 0; |
e4421fec DG |
983 | struct lttng_ht_iter iter; |
984 | struct lttng_consumer_stream *stream; | |
3bd1e081 | 985 | |
ffe60014 DG |
986 | assert(ctx); |
987 | assert(ht); | |
988 | assert(pollfd); | |
989 | assert(local_stream); | |
990 | ||
3bd1e081 | 991 | DBG("Updating poll fd array"); |
481d6c57 | 992 | rcu_read_lock(); |
43c34bc3 | 993 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { |
8994307f DG |
994 | /* |
995 | * Only active streams with an active end point can be added to the | |
996 | * poll set and local stream storage of the thread. | |
997 | * | |
998 | * There is a potential race here for endpoint_status to be updated | |
999 | * just after the check. However, this is OK since the stream(s) will | |
1000 | * be deleted once the thread is notified that the end point state has | |
1001 | * changed where this function will be called back again. | |
1002 | */ | |
1003 | if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM || | |
79d4ffb7 | 1004 | stream->endpoint_status == CONSUMER_ENDPOINT_INACTIVE) { |
3bd1e081 MD |
1005 | continue; |
1006 | } | |
7972aab2 DG |
1007 | /* |
1008 | * This clobbers way too much the debug output. Uncomment that if you | |
1009 | * need it for debugging purposes. | |
1010 | * | |
1011 | * DBG("Active FD %d", stream->wait_fd); | |
1012 | */ | |
e4421fec | 1013 | (*pollfd)[i].fd = stream->wait_fd; |
3bd1e081 | 1014 | (*pollfd)[i].events = POLLIN | POLLPRI; |
e4421fec | 1015 | local_stream[i] = stream; |
3bd1e081 MD |
1016 | i++; |
1017 | } | |
481d6c57 | 1018 | rcu_read_unlock(); |
3bd1e081 MD |
1019 | |
1020 | /* | |
50f8ae69 | 1021 | * Insert the consumer_data_pipe at the end of the array and don't |
3bd1e081 MD |
1022 | * increment i so nb_fd is the number of real FD. |
1023 | */ | |
acdb9057 | 1024 | (*pollfd)[i].fd = lttng_pipe_get_readfd(ctx->consumer_data_pipe); |
509bb1cf | 1025 | (*pollfd)[i].events = POLLIN | POLLPRI; |
3bd1e081 MD |
1026 | return i; |
1027 | } | |
1028 | ||
1029 | /* | |
1030 | * Poll on the should_quit pipe and the command socket return -1 on error and | |
1031 | * should exit, 0 if data is available on the command socket | |
1032 | */ | |
1033 | int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll) | |
1034 | { | |
1035 | int num_rdy; | |
1036 | ||
88f2b785 | 1037 | restart: |
3bd1e081 MD |
1038 | num_rdy = poll(consumer_sockpoll, 2, -1); |
1039 | if (num_rdy == -1) { | |
88f2b785 MD |
1040 | /* |
1041 | * Restart interrupted system call. | |
1042 | */ | |
1043 | if (errno == EINTR) { | |
1044 | goto restart; | |
1045 | } | |
7a57cf92 | 1046 | PERROR("Poll error"); |
3bd1e081 MD |
1047 | goto exit; |
1048 | } | |
509bb1cf | 1049 | if (consumer_sockpoll[0].revents & (POLLIN | POLLPRI)) { |
3bd1e081 MD |
1050 | DBG("consumer_should_quit wake up"); |
1051 | goto exit; | |
1052 | } | |
1053 | return 0; | |
1054 | ||
1055 | exit: | |
1056 | return -1; | |
1057 | } | |
1058 | ||
1059 | /* | |
1060 | * Set the error socket. | |
1061 | */ | |
ffe60014 DG |
1062 | void lttng_consumer_set_error_sock(struct lttng_consumer_local_data *ctx, |
1063 | int sock) | |
3bd1e081 MD |
1064 | { |
1065 | ctx->consumer_error_socket = sock; | |
1066 | } | |
1067 | ||
1068 | /* | |
1069 | * Set the command socket path. | |
1070 | */ | |
3bd1e081 MD |
1071 | void lttng_consumer_set_command_sock_path( |
1072 | struct lttng_consumer_local_data *ctx, char *sock) | |
1073 | { | |
1074 | ctx->consumer_command_sock_path = sock; | |
1075 | } | |
1076 | ||
1077 | /* | |
1078 | * Send return code to the session daemon. | |
1079 | * If the socket is not defined, we return 0, it is not a fatal error | |
1080 | */ | |
ffe60014 | 1081 | int lttng_consumer_send_error(struct lttng_consumer_local_data *ctx, int cmd) |
3bd1e081 MD |
1082 | { |
1083 | if (ctx->consumer_error_socket > 0) { | |
1084 | return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd, | |
1085 | sizeof(enum lttcomm_sessiond_command)); | |
1086 | } | |
1087 | ||
1088 | return 0; | |
1089 | } | |
1090 | ||
1091 | /* | |
228b5bf7 DG |
1092 | * Close all the tracefiles and stream fds and MUST be called when all |
1093 | * instances are destroyed i.e. when all threads were joined and are ended. | |
3bd1e081 MD |
1094 | */ |
1095 | void lttng_consumer_cleanup(void) | |
1096 | { | |
e4421fec | 1097 | struct lttng_ht_iter iter; |
ffe60014 | 1098 | struct lttng_consumer_channel *channel; |
6065ceec DG |
1099 | |
1100 | rcu_read_lock(); | |
3bd1e081 | 1101 | |
ffe60014 DG |
1102 | cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, channel, |
1103 | node.node) { | |
702b1ea4 | 1104 | consumer_del_channel(channel); |
3bd1e081 | 1105 | } |
6065ceec DG |
1106 | |
1107 | rcu_read_unlock(); | |
d6ce1df2 | 1108 | |
d6ce1df2 | 1109 | lttng_ht_destroy(consumer_data.channel_ht); |
228b5bf7 DG |
1110 | |
1111 | cleanup_relayd_ht(); | |
1112 | ||
d8ef542d MD |
1113 | lttng_ht_destroy(consumer_data.stream_per_chan_id_ht); |
1114 | ||
228b5bf7 DG |
1115 | /* |
1116 | * This HT contains streams that are freed by either the metadata thread or | |
1117 | * the data thread so we do *nothing* on the hash table and simply destroy | |
1118 | * it. | |
1119 | */ | |
1120 | lttng_ht_destroy(consumer_data.stream_list_ht); | |
3bd1e081 MD |
1121 | } |
1122 | ||
1123 | /* | |
1124 | * Called from signal handler. | |
1125 | */ | |
1126 | void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx) | |
1127 | { | |
1128 | int ret; | |
1129 | consumer_quit = 1; | |
6f94560a MD |
1130 | do { |
1131 | ret = write(ctx->consumer_should_quit[1], "4", 1); | |
1132 | } while (ret < 0 && errno == EINTR); | |
4cec016f | 1133 | if (ret < 0 || ret != 1) { |
7a57cf92 | 1134 | PERROR("write consumer quit"); |
3bd1e081 | 1135 | } |
ab1027f4 DG |
1136 | |
1137 | DBG("Consumer flag that it should quit"); | |
3bd1e081 MD |
1138 | } |
1139 | ||
00e2e675 DG |
1140 | void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream, |
1141 | off_t orig_offset) | |
3bd1e081 MD |
1142 | { |
1143 | int outfd = stream->out_fd; | |
1144 | ||
1145 | /* | |
1146 | * This does a blocking write-and-wait on any page that belongs to the | |
1147 | * subbuffer prior to the one we just wrote. | |
1148 | * Don't care about error values, as these are just hints and ways to | |
1149 | * limit the amount of page cache used. | |
1150 | */ | |
ffe60014 | 1151 | if (orig_offset < stream->max_sb_size) { |
3bd1e081 MD |
1152 | return; |
1153 | } | |
ffe60014 DG |
1154 | lttng_sync_file_range(outfd, orig_offset - stream->max_sb_size, |
1155 | stream->max_sb_size, | |
3bd1e081 MD |
1156 | SYNC_FILE_RANGE_WAIT_BEFORE |
1157 | | SYNC_FILE_RANGE_WRITE | |
1158 | | SYNC_FILE_RANGE_WAIT_AFTER); | |
1159 | /* | |
1160 | * Give hints to the kernel about how we access the file: | |
1161 | * POSIX_FADV_DONTNEED : we won't re-access data in a near future after | |
1162 | * we write it. | |
1163 | * | |
1164 | * We need to call fadvise again after the file grows because the | |
1165 | * kernel does not seem to apply fadvise to non-existing parts of the | |
1166 | * file. | |
1167 | * | |
1168 | * Call fadvise _after_ having waited for the page writeback to | |
1169 | * complete because the dirty page writeback semantic is not well | |
1170 | * defined. So it can be expected to lead to lower throughput in | |
1171 | * streaming. | |
1172 | */ | |
ffe60014 DG |
1173 | posix_fadvise(outfd, orig_offset - stream->max_sb_size, |
1174 | stream->max_sb_size, POSIX_FADV_DONTNEED); | |
3bd1e081 MD |
1175 | } |
1176 | ||
1177 | /* | |
1178 | * Initialise the necessary environnement : | |
1179 | * - create a new context | |
1180 | * - create the poll_pipe | |
1181 | * - create the should_quit pipe (for signal handler) | |
1182 | * - create the thread pipe (for splice) | |
1183 | * | |
1184 | * Takes a function pointer as argument, this function is called when data is | |
1185 | * available on a buffer. This function is responsible to do the | |
1186 | * kernctl_get_next_subbuf, read the data with mmap or splice depending on the | |
1187 | * buffer configuration and then kernctl_put_next_subbuf at the end. | |
1188 | * | |
1189 | * Returns a pointer to the new context or NULL on error. | |
1190 | */ | |
1191 | struct lttng_consumer_local_data *lttng_consumer_create( | |
1192 | enum lttng_consumer_type type, | |
4078b776 | 1193 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
d41f73b7 | 1194 | struct lttng_consumer_local_data *ctx), |
3bd1e081 MD |
1195 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
1196 | int (*recv_stream)(struct lttng_consumer_stream *stream), | |
bcfa3ff9 | 1197 | int (*update_stream)(uint64_t stream_key, uint32_t state)) |
3bd1e081 | 1198 | { |
d8ef542d | 1199 | int ret; |
3bd1e081 MD |
1200 | struct lttng_consumer_local_data *ctx; |
1201 | ||
1202 | assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN || | |
1203 | consumer_data.type == type); | |
1204 | consumer_data.type = type; | |
1205 | ||
effcf122 | 1206 | ctx = zmalloc(sizeof(struct lttng_consumer_local_data)); |
3bd1e081 | 1207 | if (ctx == NULL) { |
7a57cf92 | 1208 | PERROR("allocating context"); |
3bd1e081 MD |
1209 | goto error; |
1210 | } | |
1211 | ||
1212 | ctx->consumer_error_socket = -1; | |
331744e3 | 1213 | ctx->consumer_metadata_socket = -1; |
3bd1e081 MD |
1214 | /* assign the callbacks */ |
1215 | ctx->on_buffer_ready = buffer_ready; | |
1216 | ctx->on_recv_channel = recv_channel; | |
1217 | ctx->on_recv_stream = recv_stream; | |
1218 | ctx->on_update_stream = update_stream; | |
1219 | ||
acdb9057 DG |
1220 | ctx->consumer_data_pipe = lttng_pipe_open(0); |
1221 | if (!ctx->consumer_data_pipe) { | |
3bd1e081 MD |
1222 | goto error_poll_pipe; |
1223 | } | |
1224 | ||
1225 | ret = pipe(ctx->consumer_should_quit); | |
1226 | if (ret < 0) { | |
7a57cf92 | 1227 | PERROR("Error creating recv pipe"); |
3bd1e081 MD |
1228 | goto error_quit_pipe; |
1229 | } | |
1230 | ||
1231 | ret = pipe(ctx->consumer_thread_pipe); | |
1232 | if (ret < 0) { | |
7a57cf92 | 1233 | PERROR("Error creating thread pipe"); |
3bd1e081 MD |
1234 | goto error_thread_pipe; |
1235 | } | |
1236 | ||
d8ef542d MD |
1237 | ret = pipe(ctx->consumer_channel_pipe); |
1238 | if (ret < 0) { | |
1239 | PERROR("Error creating channel pipe"); | |
1240 | goto error_channel_pipe; | |
1241 | } | |
1242 | ||
13886d2d DG |
1243 | ctx->consumer_metadata_pipe = lttng_pipe_open(0); |
1244 | if (!ctx->consumer_metadata_pipe) { | |
fb3a43a9 DG |
1245 | goto error_metadata_pipe; |
1246 | } | |
3bd1e081 | 1247 | |
fb3a43a9 DG |
1248 | ret = utils_create_pipe(ctx->consumer_splice_metadata_pipe); |
1249 | if (ret < 0) { | |
1250 | goto error_splice_pipe; | |
1251 | } | |
1252 | ||
1253 | return ctx; | |
3bd1e081 | 1254 | |
fb3a43a9 | 1255 | error_splice_pipe: |
13886d2d | 1256 | lttng_pipe_destroy(ctx->consumer_metadata_pipe); |
fb3a43a9 | 1257 | error_metadata_pipe: |
d8ef542d MD |
1258 | utils_close_pipe(ctx->consumer_channel_pipe); |
1259 | error_channel_pipe: | |
fb3a43a9 | 1260 | utils_close_pipe(ctx->consumer_thread_pipe); |
3bd1e081 | 1261 | error_thread_pipe: |
d8ef542d | 1262 | utils_close_pipe(ctx->consumer_should_quit); |
3bd1e081 | 1263 | error_quit_pipe: |
acdb9057 | 1264 | lttng_pipe_destroy(ctx->consumer_data_pipe); |
3bd1e081 MD |
1265 | error_poll_pipe: |
1266 | free(ctx); | |
1267 | error: | |
1268 | return NULL; | |
1269 | } | |
1270 | ||
1271 | /* | |
1272 | * Close all fds associated with the instance and free the context. | |
1273 | */ | |
1274 | void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx) | |
1275 | { | |
4c462e79 MD |
1276 | int ret; |
1277 | ||
ab1027f4 DG |
1278 | DBG("Consumer destroying it. Closing everything."); |
1279 | ||
4c462e79 MD |
1280 | ret = close(ctx->consumer_error_socket); |
1281 | if (ret) { | |
1282 | PERROR("close"); | |
1283 | } | |
331744e3 JD |
1284 | ret = close(ctx->consumer_metadata_socket); |
1285 | if (ret) { | |
1286 | PERROR("close"); | |
1287 | } | |
d8ef542d MD |
1288 | utils_close_pipe(ctx->consumer_thread_pipe); |
1289 | utils_close_pipe(ctx->consumer_channel_pipe); | |
acdb9057 | 1290 | lttng_pipe_destroy(ctx->consumer_data_pipe); |
13886d2d | 1291 | lttng_pipe_destroy(ctx->consumer_metadata_pipe); |
d8ef542d | 1292 | utils_close_pipe(ctx->consumer_should_quit); |
fb3a43a9 DG |
1293 | utils_close_pipe(ctx->consumer_splice_metadata_pipe); |
1294 | ||
3bd1e081 MD |
1295 | unlink(ctx->consumer_command_sock_path); |
1296 | free(ctx); | |
1297 | } | |
1298 | ||
6197aea7 DG |
1299 | /* |
1300 | * Write the metadata stream id on the specified file descriptor. | |
1301 | */ | |
1302 | static int write_relayd_metadata_id(int fd, | |
1303 | struct lttng_consumer_stream *stream, | |
ffe60014 | 1304 | struct consumer_relayd_sock_pair *relayd, unsigned long padding) |
6197aea7 DG |
1305 | { |
1306 | int ret; | |
1d4dfdef | 1307 | struct lttcomm_relayd_metadata_payload hdr; |
6197aea7 | 1308 | |
1d4dfdef DG |
1309 | hdr.stream_id = htobe64(stream->relayd_stream_id); |
1310 | hdr.padding_size = htobe32(padding); | |
6197aea7 | 1311 | do { |
1d4dfdef | 1312 | ret = write(fd, (void *) &hdr, sizeof(hdr)); |
6197aea7 | 1313 | } while (ret < 0 && errno == EINTR); |
4cec016f | 1314 | if (ret < 0 || ret != sizeof(hdr)) { |
d7b75ec8 DG |
1315 | /* |
1316 | * This error means that the fd's end is closed so ignore the perror | |
1317 | * not to clubber the error output since this can happen in a normal | |
1318 | * code path. | |
1319 | */ | |
1320 | if (errno != EPIPE) { | |
1321 | PERROR("write metadata stream id"); | |
1322 | } | |
1323 | DBG3("Consumer failed to write relayd metadata id (errno: %d)", errno); | |
534d2592 DG |
1324 | /* |
1325 | * Set ret to a negative value because if ret != sizeof(hdr), we don't | |
1326 | * handle writting the missing part so report that as an error and | |
1327 | * don't lie to the caller. | |
1328 | */ | |
1329 | ret = -1; | |
6197aea7 DG |
1330 | goto end; |
1331 | } | |
1d4dfdef DG |
1332 | DBG("Metadata stream id %" PRIu64 " with padding %lu written before data", |
1333 | stream->relayd_stream_id, padding); | |
6197aea7 DG |
1334 | |
1335 | end: | |
1336 | return ret; | |
1337 | } | |
1338 | ||
3bd1e081 | 1339 | /* |
09e26845 DG |
1340 | * Mmap the ring buffer, read it and write the data to the tracefile. This is a |
1341 | * core function for writing trace buffers to either the local filesystem or | |
1342 | * the network. | |
1343 | * | |
79d4ffb7 DG |
1344 | * It must be called with the stream lock held. |
1345 | * | |
09e26845 | 1346 | * Careful review MUST be put if any changes occur! |
3bd1e081 MD |
1347 | * |
1348 | * Returns the number of bytes written | |
1349 | */ | |
4078b776 | 1350 | ssize_t lttng_consumer_on_read_subbuffer_mmap( |
3bd1e081 | 1351 | struct lttng_consumer_local_data *ctx, |
1d4dfdef DG |
1352 | struct lttng_consumer_stream *stream, unsigned long len, |
1353 | unsigned long padding) | |
3bd1e081 | 1354 | { |
f02e1e8a | 1355 | unsigned long mmap_offset; |
ffe60014 | 1356 | void *mmap_base; |
f02e1e8a DG |
1357 | ssize_t ret = 0, written = 0; |
1358 | off_t orig_offset = stream->out_fd_offset; | |
1359 | /* Default is on the disk */ | |
1360 | int outfd = stream->out_fd; | |
f02e1e8a | 1361 | struct consumer_relayd_sock_pair *relayd = NULL; |
8994307f | 1362 | unsigned int relayd_hang_up = 0; |
f02e1e8a DG |
1363 | |
1364 | /* RCU lock for the relayd pointer */ | |
1365 | rcu_read_lock(); | |
1366 | ||
1367 | /* Flag that the current stream if set for network streaming. */ | |
98cf381a | 1368 | if (stream->net_seq_idx != (uint64_t) -1ULL) { |
f02e1e8a DG |
1369 | relayd = consumer_find_relayd(stream->net_seq_idx); |
1370 | if (relayd == NULL) { | |
da3d1b70 | 1371 | ret = -EPIPE; |
f02e1e8a DG |
1372 | goto end; |
1373 | } | |
1374 | } | |
1375 | ||
1376 | /* get the offset inside the fd to mmap */ | |
3bd1e081 MD |
1377 | switch (consumer_data.type) { |
1378 | case LTTNG_CONSUMER_KERNEL: | |
ffe60014 | 1379 | mmap_base = stream->mmap_base; |
f02e1e8a | 1380 | ret = kernctl_get_mmap_read_offset(stream->wait_fd, &mmap_offset); |
da3d1b70 MD |
1381 | if (ret != 0) { |
1382 | PERROR("tracer ctl get_mmap_read_offset"); | |
1383 | written = -errno; | |
1384 | goto end; | |
1385 | } | |
f02e1e8a | 1386 | break; |
7753dea8 MD |
1387 | case LTTNG_CONSUMER32_UST: |
1388 | case LTTNG_CONSUMER64_UST: | |
ffe60014 DG |
1389 | mmap_base = lttng_ustctl_get_mmap_base(stream); |
1390 | if (!mmap_base) { | |
1391 | ERR("read mmap get mmap base for stream %s", stream->name); | |
da3d1b70 | 1392 | written = -EPERM; |
ffe60014 DG |
1393 | goto end; |
1394 | } | |
1395 | ret = lttng_ustctl_get_mmap_read_offset(stream, &mmap_offset); | |
da3d1b70 MD |
1396 | if (ret != 0) { |
1397 | PERROR("tracer ctl get_mmap_read_offset"); | |
1398 | written = ret; | |
1399 | goto end; | |
1400 | } | |
f02e1e8a | 1401 | break; |
3bd1e081 MD |
1402 | default: |
1403 | ERR("Unknown consumer_data type"); | |
1404 | assert(0); | |
1405 | } | |
b9182dd9 | 1406 | |
f02e1e8a DG |
1407 | /* Handle stream on the relayd if the output is on the network */ |
1408 | if (relayd) { | |
1409 | unsigned long netlen = len; | |
1410 | ||
1411 | /* | |
1412 | * Lock the control socket for the complete duration of the function | |
1413 | * since from this point on we will use the socket. | |
1414 | */ | |
1415 | if (stream->metadata_flag) { | |
1416 | /* Metadata requires the control socket. */ | |
1417 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1d4dfdef | 1418 | netlen += sizeof(struct lttcomm_relayd_metadata_payload); |
f02e1e8a DG |
1419 | } |
1420 | ||
1d4dfdef | 1421 | ret = write_relayd_stream_header(stream, netlen, padding, relayd); |
f02e1e8a DG |
1422 | if (ret >= 0) { |
1423 | /* Use the returned socket. */ | |
1424 | outfd = ret; | |
1425 | ||
1426 | /* Write metadata stream id before payload */ | |
1427 | if (stream->metadata_flag) { | |
1d4dfdef | 1428 | ret = write_relayd_metadata_id(outfd, stream, relayd, padding); |
f02e1e8a | 1429 | if (ret < 0) { |
f02e1e8a | 1430 | written = ret; |
8994307f DG |
1431 | /* Socket operation failed. We consider the relayd dead */ |
1432 | if (ret == -EPIPE || ret == -EINVAL) { | |
1433 | relayd_hang_up = 1; | |
1434 | goto write_error; | |
1435 | } | |
f02e1e8a DG |
1436 | goto end; |
1437 | } | |
f02e1e8a | 1438 | } |
8994307f DG |
1439 | } else { |
1440 | /* Socket operation failed. We consider the relayd dead */ | |
1441 | if (ret == -EPIPE || ret == -EINVAL) { | |
1442 | relayd_hang_up = 1; | |
1443 | goto write_error; | |
1444 | } | |
1445 | /* Else, use the default set before which is the filesystem. */ | |
f02e1e8a | 1446 | } |
1d4dfdef DG |
1447 | } else { |
1448 | /* No streaming, we have to set the len with the full padding */ | |
1449 | len += padding; | |
1624d5b7 JD |
1450 | |
1451 | /* | |
1452 | * Check if we need to change the tracefile before writing the packet. | |
1453 | */ | |
1454 | if (stream->chan->tracefile_size > 0 && | |
1455 | (stream->tracefile_size_current + len) > | |
1456 | stream->chan->tracefile_size) { | |
fe4477ee JD |
1457 | ret = utils_rotate_stream_file(stream->chan->pathname, |
1458 | stream->name, stream->chan->tracefile_size, | |
1459 | stream->chan->tracefile_count, stream->uid, stream->gid, | |
1460 | stream->out_fd, &(stream->tracefile_count_current)); | |
1624d5b7 JD |
1461 | if (ret < 0) { |
1462 | ERR("Rotating output file"); | |
1463 | goto end; | |
1464 | } | |
fe4477ee | 1465 | outfd = stream->out_fd = ret; |
a6976990 DG |
1466 | /* Reset current size because we just perform a rotation. */ |
1467 | stream->tracefile_size_current = 0; | |
e32c867f JD |
1468 | stream->out_fd_offset = 0; |
1469 | orig_offset = 0; | |
1624d5b7 JD |
1470 | } |
1471 | stream->tracefile_size_current += len; | |
f02e1e8a DG |
1472 | } |
1473 | ||
1474 | while (len > 0) { | |
1475 | do { | |
ffe60014 | 1476 | ret = write(outfd, mmap_base + mmap_offset, len); |
f02e1e8a | 1477 | } while (ret < 0 && errno == EINTR); |
1d4dfdef | 1478 | DBG("Consumer mmap write() ret %zd (len %lu)", ret, len); |
f02e1e8a | 1479 | if (ret < 0) { |
c5c45efa DG |
1480 | /* |
1481 | * This is possible if the fd is closed on the other side (outfd) | |
1482 | * or any write problem. It can be verbose a bit for a normal | |
1483 | * execution if for instance the relayd is stopped abruptly. This | |
1484 | * can happen so set this to a DBG statement. | |
1485 | */ | |
1486 | DBG("Error in file write mmap"); | |
f02e1e8a | 1487 | if (written == 0) { |
da3d1b70 | 1488 | written = -errno; |
f02e1e8a | 1489 | } |
8994307f DG |
1490 | /* Socket operation failed. We consider the relayd dead */ |
1491 | if (errno == EPIPE || errno == EINVAL) { | |
1492 | relayd_hang_up = 1; | |
1493 | goto write_error; | |
1494 | } | |
f02e1e8a DG |
1495 | goto end; |
1496 | } else if (ret > len) { | |
77c7c900 | 1497 | PERROR("Error in file write (ret %zd > len %lu)", ret, len); |
f02e1e8a DG |
1498 | written += ret; |
1499 | goto end; | |
1500 | } else { | |
1501 | len -= ret; | |
1502 | mmap_offset += ret; | |
1503 | } | |
f02e1e8a DG |
1504 | |
1505 | /* This call is useless on a socket so better save a syscall. */ | |
1506 | if (!relayd) { | |
1507 | /* This won't block, but will start writeout asynchronously */ | |
1508 | lttng_sync_file_range(outfd, stream->out_fd_offset, ret, | |
1509 | SYNC_FILE_RANGE_WRITE); | |
1510 | stream->out_fd_offset += ret; | |
1511 | } | |
6d67e4b4 | 1512 | stream->output_written += ret; |
f02e1e8a DG |
1513 | written += ret; |
1514 | } | |
1515 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
1516 | ||
8994307f DG |
1517 | write_error: |
1518 | /* | |
1519 | * This is a special case that the relayd has closed its socket. Let's | |
1520 | * cleanup the relayd object and all associated streams. | |
1521 | */ | |
1522 | if (relayd && relayd_hang_up) { | |
1523 | cleanup_relayd(relayd, ctx); | |
1524 | } | |
1525 | ||
f02e1e8a DG |
1526 | end: |
1527 | /* Unlock only if ctrl socket used */ | |
1528 | if (relayd && stream->metadata_flag) { | |
1529 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1530 | } | |
1531 | ||
1532 | rcu_read_unlock(); | |
1533 | return written; | |
3bd1e081 MD |
1534 | } |
1535 | ||
1536 | /* | |
1537 | * Splice the data from the ring buffer to the tracefile. | |
1538 | * | |
79d4ffb7 DG |
1539 | * It must be called with the stream lock held. |
1540 | * | |
3bd1e081 MD |
1541 | * Returns the number of bytes spliced. |
1542 | */ | |
4078b776 | 1543 | ssize_t lttng_consumer_on_read_subbuffer_splice( |
3bd1e081 | 1544 | struct lttng_consumer_local_data *ctx, |
1d4dfdef DG |
1545 | struct lttng_consumer_stream *stream, unsigned long len, |
1546 | unsigned long padding) | |
3bd1e081 | 1547 | { |
f02e1e8a DG |
1548 | ssize_t ret = 0, written = 0, ret_splice = 0; |
1549 | loff_t offset = 0; | |
1550 | off_t orig_offset = stream->out_fd_offset; | |
1551 | int fd = stream->wait_fd; | |
1552 | /* Default is on the disk */ | |
1553 | int outfd = stream->out_fd; | |
f02e1e8a | 1554 | struct consumer_relayd_sock_pair *relayd = NULL; |
fb3a43a9 | 1555 | int *splice_pipe; |
8994307f | 1556 | unsigned int relayd_hang_up = 0; |
f02e1e8a | 1557 | |
3bd1e081 MD |
1558 | switch (consumer_data.type) { |
1559 | case LTTNG_CONSUMER_KERNEL: | |
f02e1e8a | 1560 | break; |
7753dea8 MD |
1561 | case LTTNG_CONSUMER32_UST: |
1562 | case LTTNG_CONSUMER64_UST: | |
f02e1e8a | 1563 | /* Not supported for user space tracing */ |
3bd1e081 MD |
1564 | return -ENOSYS; |
1565 | default: | |
1566 | ERR("Unknown consumer_data type"); | |
1567 | assert(0); | |
3bd1e081 MD |
1568 | } |
1569 | ||
f02e1e8a DG |
1570 | /* RCU lock for the relayd pointer */ |
1571 | rcu_read_lock(); | |
1572 | ||
1573 | /* Flag that the current stream if set for network streaming. */ | |
98cf381a | 1574 | if (stream->net_seq_idx != (uint64_t) -1ULL) { |
f02e1e8a DG |
1575 | relayd = consumer_find_relayd(stream->net_seq_idx); |
1576 | if (relayd == NULL) { | |
da3d1b70 | 1577 | ret = -EPIPE; |
f02e1e8a DG |
1578 | goto end; |
1579 | } | |
1580 | } | |
1581 | ||
fb3a43a9 DG |
1582 | /* |
1583 | * Choose right pipe for splice. Metadata and trace data are handled by | |
1584 | * different threads hence the use of two pipes in order not to race or | |
1585 | * corrupt the written data. | |
1586 | */ | |
1587 | if (stream->metadata_flag) { | |
1588 | splice_pipe = ctx->consumer_splice_metadata_pipe; | |
1589 | } else { | |
1590 | splice_pipe = ctx->consumer_thread_pipe; | |
1591 | } | |
1592 | ||
f02e1e8a | 1593 | /* Write metadata stream id before payload */ |
1d4dfdef DG |
1594 | if (relayd) { |
1595 | int total_len = len; | |
f02e1e8a | 1596 | |
1d4dfdef DG |
1597 | if (stream->metadata_flag) { |
1598 | /* | |
1599 | * Lock the control socket for the complete duration of the function | |
1600 | * since from this point on we will use the socket. | |
1601 | */ | |
1602 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1603 | ||
1604 | ret = write_relayd_metadata_id(splice_pipe[1], stream, relayd, | |
1605 | padding); | |
1606 | if (ret < 0) { | |
1607 | written = ret; | |
8994307f DG |
1608 | /* Socket operation failed. We consider the relayd dead */ |
1609 | if (ret == -EBADF) { | |
1610 | WARN("Remote relayd disconnected. Stopping"); | |
1611 | relayd_hang_up = 1; | |
1612 | goto write_error; | |
1613 | } | |
1d4dfdef DG |
1614 | goto end; |
1615 | } | |
1616 | ||
1617 | total_len += sizeof(struct lttcomm_relayd_metadata_payload); | |
1618 | } | |
1619 | ||
1620 | ret = write_relayd_stream_header(stream, total_len, padding, relayd); | |
1621 | if (ret >= 0) { | |
1622 | /* Use the returned socket. */ | |
1623 | outfd = ret; | |
1624 | } else { | |
8994307f DG |
1625 | /* Socket operation failed. We consider the relayd dead */ |
1626 | if (ret == -EBADF) { | |
1627 | WARN("Remote relayd disconnected. Stopping"); | |
1628 | relayd_hang_up = 1; | |
1629 | goto write_error; | |
1630 | } | |
f02e1e8a DG |
1631 | goto end; |
1632 | } | |
1d4dfdef DG |
1633 | } else { |
1634 | /* No streaming, we have to set the len with the full padding */ | |
1635 | len += padding; | |
1624d5b7 JD |
1636 | |
1637 | /* | |
1638 | * Check if we need to change the tracefile before writing the packet. | |
1639 | */ | |
1640 | if (stream->chan->tracefile_size > 0 && | |
1641 | (stream->tracefile_size_current + len) > | |
1642 | stream->chan->tracefile_size) { | |
fe4477ee JD |
1643 | ret = utils_rotate_stream_file(stream->chan->pathname, |
1644 | stream->name, stream->chan->tracefile_size, | |
1645 | stream->chan->tracefile_count, stream->uid, stream->gid, | |
1646 | stream->out_fd, &(stream->tracefile_count_current)); | |
1624d5b7 JD |
1647 | if (ret < 0) { |
1648 | ERR("Rotating output file"); | |
1649 | goto end; | |
1650 | } | |
fe4477ee | 1651 | outfd = stream->out_fd = ret; |
a6976990 DG |
1652 | /* Reset current size because we just perform a rotation. */ |
1653 | stream->tracefile_size_current = 0; | |
e32c867f JD |
1654 | stream->out_fd_offset = 0; |
1655 | orig_offset = 0; | |
1624d5b7 JD |
1656 | } |
1657 | stream->tracefile_size_current += len; | |
f02e1e8a DG |
1658 | } |
1659 | ||
1660 | while (len > 0) { | |
1d4dfdef DG |
1661 | DBG("splice chan to pipe offset %lu of len %lu (fd : %d, pipe: %d)", |
1662 | (unsigned long)offset, len, fd, splice_pipe[1]); | |
fb3a43a9 | 1663 | ret_splice = splice(fd, &offset, splice_pipe[1], NULL, len, |
f02e1e8a DG |
1664 | SPLICE_F_MOVE | SPLICE_F_MORE); |
1665 | DBG("splice chan to pipe, ret %zd", ret_splice); | |
1666 | if (ret_splice < 0) { | |
1667 | PERROR("Error in relay splice"); | |
1668 | if (written == 0) { | |
1669 | written = ret_splice; | |
1670 | } | |
1671 | ret = errno; | |
1672 | goto splice_error; | |
1673 | } | |
1674 | ||
1675 | /* Handle stream on the relayd if the output is on the network */ | |
1676 | if (relayd) { | |
1677 | if (stream->metadata_flag) { | |
1d4dfdef DG |
1678 | size_t metadata_payload_size = |
1679 | sizeof(struct lttcomm_relayd_metadata_payload); | |
1680 | ||
f02e1e8a | 1681 | /* Update counter to fit the spliced data */ |
1d4dfdef DG |
1682 | ret_splice += metadata_payload_size; |
1683 | len += metadata_payload_size; | |
f02e1e8a DG |
1684 | /* |
1685 | * We do this so the return value can match the len passed as | |
1686 | * argument to this function. | |
1687 | */ | |
1d4dfdef | 1688 | written -= metadata_payload_size; |
f02e1e8a DG |
1689 | } |
1690 | } | |
1691 | ||
1692 | /* Splice data out */ | |
fb3a43a9 | 1693 | ret_splice = splice(splice_pipe[0], NULL, outfd, NULL, |
f02e1e8a | 1694 | ret_splice, SPLICE_F_MOVE | SPLICE_F_MORE); |
1d4dfdef | 1695 | DBG("Consumer splice pipe to file, ret %zd", ret_splice); |
f02e1e8a DG |
1696 | if (ret_splice < 0) { |
1697 | PERROR("Error in file splice"); | |
1698 | if (written == 0) { | |
1699 | written = ret_splice; | |
1700 | } | |
8994307f | 1701 | /* Socket operation failed. We consider the relayd dead */ |
00c8752b | 1702 | if (errno == EBADF || errno == EPIPE) { |
8994307f DG |
1703 | WARN("Remote relayd disconnected. Stopping"); |
1704 | relayd_hang_up = 1; | |
1705 | goto write_error; | |
1706 | } | |
f02e1e8a DG |
1707 | ret = errno; |
1708 | goto splice_error; | |
1709 | } else if (ret_splice > len) { | |
1710 | errno = EINVAL; | |
1711 | PERROR("Wrote more data than requested %zd (len: %lu)", | |
1712 | ret_splice, len); | |
1713 | written += ret_splice; | |
1714 | ret = errno; | |
1715 | goto splice_error; | |
1716 | } | |
1717 | len -= ret_splice; | |
1718 | ||
1719 | /* This call is useless on a socket so better save a syscall. */ | |
1720 | if (!relayd) { | |
1721 | /* This won't block, but will start writeout asynchronously */ | |
1722 | lttng_sync_file_range(outfd, stream->out_fd_offset, ret_splice, | |
1723 | SYNC_FILE_RANGE_WRITE); | |
1724 | stream->out_fd_offset += ret_splice; | |
1725 | } | |
6d67e4b4 | 1726 | stream->output_written += ret_splice; |
f02e1e8a DG |
1727 | written += ret_splice; |
1728 | } | |
1729 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
1730 | ||
1731 | ret = ret_splice; | |
1732 | ||
1733 | goto end; | |
1734 | ||
8994307f DG |
1735 | write_error: |
1736 | /* | |
1737 | * This is a special case that the relayd has closed its socket. Let's | |
1738 | * cleanup the relayd object and all associated streams. | |
1739 | */ | |
1740 | if (relayd && relayd_hang_up) { | |
1741 | cleanup_relayd(relayd, ctx); | |
1742 | /* Skip splice error so the consumer does not fail */ | |
1743 | goto end; | |
1744 | } | |
1745 | ||
f02e1e8a DG |
1746 | splice_error: |
1747 | /* send the appropriate error description to sessiond */ | |
1748 | switch (ret) { | |
f02e1e8a | 1749 | case EINVAL: |
f73fabfd | 1750 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_EINVAL); |
f02e1e8a DG |
1751 | break; |
1752 | case ENOMEM: | |
f73fabfd | 1753 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ENOMEM); |
f02e1e8a DG |
1754 | break; |
1755 | case ESPIPE: | |
f73fabfd | 1756 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ESPIPE); |
f02e1e8a DG |
1757 | break; |
1758 | } | |
1759 | ||
1760 | end: | |
1761 | if (relayd && stream->metadata_flag) { | |
1762 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1763 | } | |
1764 | ||
1765 | rcu_read_unlock(); | |
1766 | return written; | |
3bd1e081 MD |
1767 | } |
1768 | ||
1769 | /* | |
1770 | * Take a snapshot for a specific fd | |
1771 | * | |
1772 | * Returns 0 on success, < 0 on error | |
1773 | */ | |
ffe60014 | 1774 | int lttng_consumer_take_snapshot(struct lttng_consumer_stream *stream) |
3bd1e081 MD |
1775 | { |
1776 | switch (consumer_data.type) { | |
1777 | case LTTNG_CONSUMER_KERNEL: | |
ffe60014 | 1778 | return lttng_kconsumer_take_snapshot(stream); |
7753dea8 MD |
1779 | case LTTNG_CONSUMER32_UST: |
1780 | case LTTNG_CONSUMER64_UST: | |
ffe60014 | 1781 | return lttng_ustconsumer_take_snapshot(stream); |
3bd1e081 MD |
1782 | default: |
1783 | ERR("Unknown consumer_data type"); | |
1784 | assert(0); | |
1785 | return -ENOSYS; | |
1786 | } | |
3bd1e081 MD |
1787 | } |
1788 | ||
1789 | /* | |
1790 | * Get the produced position | |
1791 | * | |
1792 | * Returns 0 on success, < 0 on error | |
1793 | */ | |
ffe60014 | 1794 | int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream *stream, |
3bd1e081 MD |
1795 | unsigned long *pos) |
1796 | { | |
1797 | switch (consumer_data.type) { | |
1798 | case LTTNG_CONSUMER_KERNEL: | |
ffe60014 | 1799 | return lttng_kconsumer_get_produced_snapshot(stream, pos); |
7753dea8 MD |
1800 | case LTTNG_CONSUMER32_UST: |
1801 | case LTTNG_CONSUMER64_UST: | |
ffe60014 | 1802 | return lttng_ustconsumer_get_produced_snapshot(stream, pos); |
3bd1e081 MD |
1803 | default: |
1804 | ERR("Unknown consumer_data type"); | |
1805 | assert(0); | |
1806 | return -ENOSYS; | |
1807 | } | |
1808 | } | |
1809 | ||
1810 | int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, | |
1811 | int sock, struct pollfd *consumer_sockpoll) | |
1812 | { | |
1813 | switch (consumer_data.type) { | |
1814 | case LTTNG_CONSUMER_KERNEL: | |
1815 | return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
7753dea8 MD |
1816 | case LTTNG_CONSUMER32_UST: |
1817 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1818 | return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll); |
1819 | default: | |
1820 | ERR("Unknown consumer_data type"); | |
1821 | assert(0); | |
1822 | return -ENOSYS; | |
1823 | } | |
1824 | } | |
1825 | ||
43c34bc3 DG |
1826 | /* |
1827 | * Iterate over all streams of the hashtable and free them properly. | |
1828 | * | |
1829 | * WARNING: *MUST* be used with data stream only. | |
1830 | */ | |
1831 | static void destroy_data_stream_ht(struct lttng_ht *ht) | |
1832 | { | |
43c34bc3 DG |
1833 | struct lttng_ht_iter iter; |
1834 | struct lttng_consumer_stream *stream; | |
1835 | ||
1836 | if (ht == NULL) { | |
1837 | return; | |
1838 | } | |
1839 | ||
1840 | rcu_read_lock(); | |
1841 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { | |
5c540210 DG |
1842 | /* |
1843 | * Ignore return value since we are currently cleaning up so any error | |
1844 | * can't be handled. | |
1845 | */ | |
1846 | (void) consumer_del_stream(stream, ht); | |
43c34bc3 DG |
1847 | } |
1848 | rcu_read_unlock(); | |
1849 | ||
1850 | lttng_ht_destroy(ht); | |
1851 | } | |
1852 | ||
fb3a43a9 | 1853 | /* |
f724d81e | 1854 | * Iterate over all streams of the hashtable and free them properly. |
e316aad5 DG |
1855 | * |
1856 | * XXX: Should not be only for metadata stream or else use an other name. | |
fb3a43a9 DG |
1857 | */ |
1858 | static void destroy_stream_ht(struct lttng_ht *ht) | |
1859 | { | |
fb3a43a9 DG |
1860 | struct lttng_ht_iter iter; |
1861 | struct lttng_consumer_stream *stream; | |
1862 | ||
1863 | if (ht == NULL) { | |
1864 | return; | |
1865 | } | |
1866 | ||
d09e1200 | 1867 | rcu_read_lock(); |
58b1f425 | 1868 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { |
5c540210 DG |
1869 | /* |
1870 | * Ignore return value since we are currently cleaning up so any error | |
1871 | * can't be handled. | |
1872 | */ | |
1873 | (void) consumer_del_metadata_stream(stream, ht); | |
fb3a43a9 | 1874 | } |
d09e1200 | 1875 | rcu_read_unlock(); |
fb3a43a9 DG |
1876 | |
1877 | lttng_ht_destroy(ht); | |
1878 | } | |
1879 | ||
d88aee68 DG |
1880 | void lttng_consumer_close_metadata(void) |
1881 | { | |
1882 | switch (consumer_data.type) { | |
1883 | case LTTNG_CONSUMER_KERNEL: | |
1884 | /* | |
1885 | * The Kernel consumer has a different metadata scheme so we don't | |
1886 | * close anything because the stream will be closed by the session | |
1887 | * daemon. | |
1888 | */ | |
1889 | break; | |
1890 | case LTTNG_CONSUMER32_UST: | |
1891 | case LTTNG_CONSUMER64_UST: | |
1892 | /* | |
1893 | * Close all metadata streams. The metadata hash table is passed and | |
1894 | * this call iterates over it by closing all wakeup fd. This is safe | |
1895 | * because at this point we are sure that the metadata producer is | |
1896 | * either dead or blocked. | |
1897 | */ | |
1898 | lttng_ustconsumer_close_metadata(metadata_ht); | |
1899 | break; | |
1900 | default: | |
1901 | ERR("Unknown consumer_data type"); | |
1902 | assert(0); | |
1903 | } | |
1904 | } | |
1905 | ||
fb3a43a9 DG |
1906 | /* |
1907 | * Clean up a metadata stream and free its memory. | |
1908 | */ | |
e316aad5 DG |
1909 | void consumer_del_metadata_stream(struct lttng_consumer_stream *stream, |
1910 | struct lttng_ht *ht) | |
fb3a43a9 DG |
1911 | { |
1912 | int ret; | |
e316aad5 DG |
1913 | struct lttng_ht_iter iter; |
1914 | struct lttng_consumer_channel *free_chan = NULL; | |
fb3a43a9 DG |
1915 | struct consumer_relayd_sock_pair *relayd; |
1916 | ||
1917 | assert(stream); | |
1918 | /* | |
1919 | * This call should NEVER receive regular stream. It must always be | |
1920 | * metadata stream and this is crucial for data structure synchronization. | |
1921 | */ | |
1922 | assert(stream->metadata_flag); | |
1923 | ||
e316aad5 DG |
1924 | DBG3("Consumer delete metadata stream %d", stream->wait_fd); |
1925 | ||
1926 | if (ht == NULL) { | |
1927 | /* Means the stream was allocated but not successfully added */ | |
ffe60014 | 1928 | goto free_stream_rcu; |
e316aad5 DG |
1929 | } |
1930 | ||
74251bb8 | 1931 | pthread_mutex_lock(&consumer_data.lock); |
72c3879d | 1932 | pthread_mutex_lock(&stream->chan->lock); |
8994307f DG |
1933 | pthread_mutex_lock(&stream->lock); |
1934 | ||
fb3a43a9 DG |
1935 | switch (consumer_data.type) { |
1936 | case LTTNG_CONSUMER_KERNEL: | |
1937 | if (stream->mmap_base != NULL) { | |
1938 | ret = munmap(stream->mmap_base, stream->mmap_len); | |
1939 | if (ret != 0) { | |
1940 | PERROR("munmap metadata stream"); | |
1941 | } | |
1942 | } | |
4c95e622 JD |
1943 | |
1944 | if (stream->wait_fd >= 0) { | |
1945 | ret = close(stream->wait_fd); | |
1946 | if (ret < 0) { | |
1947 | PERROR("close kernel metadata wait_fd"); | |
1948 | } | |
1949 | } | |
fb3a43a9 DG |
1950 | break; |
1951 | case LTTNG_CONSUMER32_UST: | |
1952 | case LTTNG_CONSUMER64_UST: | |
1953 | lttng_ustconsumer_del_stream(stream); | |
1954 | break; | |
1955 | default: | |
1956 | ERR("Unknown consumer_data type"); | |
1957 | assert(0); | |
e316aad5 | 1958 | goto end; |
fb3a43a9 | 1959 | } |
fb3a43a9 | 1960 | |
c869f647 | 1961 | rcu_read_lock(); |
58b1f425 | 1962 | iter.iter.node = &stream->node.node; |
c869f647 DG |
1963 | ret = lttng_ht_del(ht, &iter); |
1964 | assert(!ret); | |
ca22feea | 1965 | |
d8ef542d MD |
1966 | iter.iter.node = &stream->node_channel_id.node; |
1967 | ret = lttng_ht_del(consumer_data.stream_per_chan_id_ht, &iter); | |
1968 | assert(!ret); | |
1969 | ||
ca22feea DG |
1970 | iter.iter.node = &stream->node_session_id.node; |
1971 | ret = lttng_ht_del(consumer_data.stream_list_ht, &iter); | |
1972 | assert(!ret); | |
c869f647 DG |
1973 | rcu_read_unlock(); |
1974 | ||
fb3a43a9 DG |
1975 | if (stream->out_fd >= 0) { |
1976 | ret = close(stream->out_fd); | |
1977 | if (ret) { | |
1978 | PERROR("close"); | |
1979 | } | |
1980 | } | |
1981 | ||
fb3a43a9 DG |
1982 | /* Check and cleanup relayd */ |
1983 | rcu_read_lock(); | |
1984 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1985 | if (relayd != NULL) { | |
1986 | uatomic_dec(&relayd->refcount); | |
1987 | assert(uatomic_read(&relayd->refcount) >= 0); | |
1988 | ||
1989 | /* Closing streams requires to lock the control socket. */ | |
1990 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1991 | ret = relayd_send_close_stream(&relayd->control_sock, | |
1992 | stream->relayd_stream_id, stream->next_net_seq_num - 1); | |
1993 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1994 | if (ret < 0) { | |
1995 | DBG("Unable to close stream on the relayd. Continuing"); | |
1996 | /* | |
1997 | * Continue here. There is nothing we can do for the relayd. | |
1998 | * Chances are that the relayd has closed the socket so we just | |
1999 | * continue cleaning up. | |
2000 | */ | |
2001 | } | |
2002 | ||
2003 | /* Both conditions are met, we destroy the relayd. */ | |
2004 | if (uatomic_read(&relayd->refcount) == 0 && | |
2005 | uatomic_read(&relayd->destroy_flag)) { | |
d09e1200 | 2006 | destroy_relayd(relayd); |
fb3a43a9 DG |
2007 | } |
2008 | } | |
2009 | rcu_read_unlock(); | |
2010 | ||
2011 | /* Atomically decrement channel refcount since other threads can use it. */ | |
f2ad556d | 2012 | if (!uatomic_sub_return(&stream->chan->refcount, 1) |
ffe60014 | 2013 | && !uatomic_read(&stream->chan->nb_init_stream_left)) { |
c30aaa51 | 2014 | /* Go for channel deletion! */ |
e316aad5 | 2015 | free_chan = stream->chan; |
fb3a43a9 DG |
2016 | } |
2017 | ||
e316aad5 | 2018 | end: |
73811ecc DG |
2019 | /* |
2020 | * Nullify the stream reference so it is not used after deletion. The | |
f0e1c785 MD |
2021 | * channel lock MUST be acquired before being able to check for |
2022 | * a NULL pointer value. | |
73811ecc DG |
2023 | */ |
2024 | stream->chan->metadata_stream = NULL; | |
2025 | ||
8994307f | 2026 | pthread_mutex_unlock(&stream->lock); |
72c3879d | 2027 | pthread_mutex_unlock(&stream->chan->lock); |
74251bb8 | 2028 | pthread_mutex_unlock(&consumer_data.lock); |
e316aad5 DG |
2029 | |
2030 | if (free_chan) { | |
2031 | consumer_del_channel(free_chan); | |
2032 | } | |
2033 | ||
ffe60014 DG |
2034 | free_stream_rcu: |
2035 | call_rcu(&stream->node.head, free_stream_rcu); | |
fb3a43a9 DG |
2036 | } |
2037 | ||
2038 | /* | |
2039 | * Action done with the metadata stream when adding it to the consumer internal | |
2040 | * data structures to handle it. | |
2041 | */ | |
155e9bb8 | 2042 | int consumer_add_metadata_stream(struct lttng_consumer_stream *stream) |
fb3a43a9 | 2043 | { |
155e9bb8 | 2044 | struct lttng_ht *ht = metadata_ht; |
e316aad5 | 2045 | int ret = 0; |
fb3a43a9 | 2046 | struct consumer_relayd_sock_pair *relayd; |
76082088 | 2047 | struct lttng_ht_iter iter; |
d88aee68 | 2048 | struct lttng_ht_node_u64 *node; |
fb3a43a9 | 2049 | |
e316aad5 DG |
2050 | assert(stream); |
2051 | assert(ht); | |
2052 | ||
d88aee68 | 2053 | DBG3("Adding metadata stream %" PRIu64 " to hash table", stream->key); |
e316aad5 DG |
2054 | |
2055 | pthread_mutex_lock(&consumer_data.lock); | |
72c3879d | 2056 | pthread_mutex_lock(&stream->chan->lock); |
6ca1a6b0 | 2057 | pthread_mutex_lock(&stream->chan->timer_lock); |
2e818a6a | 2058 | pthread_mutex_lock(&stream->lock); |
e316aad5 | 2059 | |
e316aad5 DG |
2060 | /* |
2061 | * From here, refcounts are updated so be _careful_ when returning an error | |
2062 | * after this point. | |
2063 | */ | |
2064 | ||
fb3a43a9 | 2065 | rcu_read_lock(); |
76082088 DG |
2066 | |
2067 | /* | |
2068 | * Lookup the stream just to make sure it does not exist in our internal | |
2069 | * state. This should NEVER happen. | |
2070 | */ | |
d88aee68 DG |
2071 | lttng_ht_lookup(ht, &stream->key, &iter); |
2072 | node = lttng_ht_iter_get_node_u64(&iter); | |
76082088 DG |
2073 | assert(!node); |
2074 | ||
e316aad5 | 2075 | /* Find relayd and, if one is found, increment refcount. */ |
fb3a43a9 DG |
2076 | relayd = consumer_find_relayd(stream->net_seq_idx); |
2077 | if (relayd != NULL) { | |
2078 | uatomic_inc(&relayd->refcount); | |
2079 | } | |
e316aad5 | 2080 | |
e316aad5 | 2081 | /* |
ffe60014 DG |
2082 | * When nb_init_stream_left reaches 0, we don't need to trigger any action |
2083 | * in terms of destroying the associated channel, because the action that | |
e316aad5 DG |
2084 | * causes the count to become 0 also causes a stream to be added. The |
2085 | * channel deletion will thus be triggered by the following removal of this | |
2086 | * stream. | |
2087 | */ | |
ffe60014 | 2088 | if (uatomic_read(&stream->chan->nb_init_stream_left) > 0) { |
f2ad556d MD |
2089 | /* Increment refcount before decrementing nb_init_stream_left */ |
2090 | cmm_smp_wmb(); | |
ffe60014 | 2091 | uatomic_dec(&stream->chan->nb_init_stream_left); |
e316aad5 DG |
2092 | } |
2093 | ||
d88aee68 | 2094 | lttng_ht_add_unique_u64(ht, &stream->node); |
ca22feea | 2095 | |
d8ef542d MD |
2096 | lttng_ht_add_unique_u64(consumer_data.stream_per_chan_id_ht, |
2097 | &stream->node_channel_id); | |
2098 | ||
ca22feea DG |
2099 | /* |
2100 | * Add stream to the stream_list_ht of the consumer data. No need to steal | |
2101 | * the key since the HT does not use it and we allow to add redundant keys | |
2102 | * into this table. | |
2103 | */ | |
d88aee68 | 2104 | lttng_ht_add_u64(consumer_data.stream_list_ht, &stream->node_session_id); |
ca22feea | 2105 | |
fb3a43a9 | 2106 | rcu_read_unlock(); |
e316aad5 | 2107 | |
2e818a6a | 2108 | pthread_mutex_unlock(&stream->lock); |
72c3879d | 2109 | pthread_mutex_unlock(&stream->chan->lock); |
6ca1a6b0 | 2110 | pthread_mutex_unlock(&stream->chan->timer_lock); |
e316aad5 DG |
2111 | pthread_mutex_unlock(&consumer_data.lock); |
2112 | return ret; | |
fb3a43a9 DG |
2113 | } |
2114 | ||
8994307f DG |
2115 | /* |
2116 | * Delete data stream that are flagged for deletion (endpoint_status). | |
2117 | */ | |
2118 | static void validate_endpoint_status_data_stream(void) | |
2119 | { | |
2120 | struct lttng_ht_iter iter; | |
2121 | struct lttng_consumer_stream *stream; | |
2122 | ||
2123 | DBG("Consumer delete flagged data stream"); | |
2124 | ||
2125 | rcu_read_lock(); | |
2126 | cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) { | |
2127 | /* Validate delete flag of the stream */ | |
79d4ffb7 | 2128 | if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) { |
8994307f DG |
2129 | continue; |
2130 | } | |
2131 | /* Delete it right now */ | |
2132 | consumer_del_stream(stream, data_ht); | |
2133 | } | |
2134 | rcu_read_unlock(); | |
2135 | } | |
2136 | ||
2137 | /* | |
2138 | * Delete metadata stream that are flagged for deletion (endpoint_status). | |
2139 | */ | |
2140 | static void validate_endpoint_status_metadata_stream( | |
2141 | struct lttng_poll_event *pollset) | |
2142 | { | |
2143 | struct lttng_ht_iter iter; | |
2144 | struct lttng_consumer_stream *stream; | |
2145 | ||
2146 | DBG("Consumer delete flagged metadata stream"); | |
2147 | ||
2148 | assert(pollset); | |
2149 | ||
2150 | rcu_read_lock(); | |
2151 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) { | |
2152 | /* Validate delete flag of the stream */ | |
79d4ffb7 | 2153 | if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) { |
8994307f DG |
2154 | continue; |
2155 | } | |
2156 | /* | |
2157 | * Remove from pollset so the metadata thread can continue without | |
2158 | * blocking on a deleted stream. | |
2159 | */ | |
2160 | lttng_poll_del(pollset, stream->wait_fd); | |
2161 | ||
2162 | /* Delete it right now */ | |
2163 | consumer_del_metadata_stream(stream, metadata_ht); | |
2164 | } | |
2165 | rcu_read_unlock(); | |
2166 | } | |
2167 | ||
fb3a43a9 DG |
2168 | /* |
2169 | * Thread polls on metadata file descriptor and write them on disk or on the | |
2170 | * network. | |
2171 | */ | |
7d980def | 2172 | void *consumer_thread_metadata_poll(void *data) |
fb3a43a9 DG |
2173 | { |
2174 | int ret, i, pollfd; | |
2175 | uint32_t revents, nb_fd; | |
e316aad5 | 2176 | struct lttng_consumer_stream *stream = NULL; |
fb3a43a9 | 2177 | struct lttng_ht_iter iter; |
d88aee68 | 2178 | struct lttng_ht_node_u64 *node; |
fb3a43a9 DG |
2179 | struct lttng_poll_event events; |
2180 | struct lttng_consumer_local_data *ctx = data; | |
2181 | ssize_t len; | |
2182 | ||
2183 | rcu_register_thread(); | |
2184 | ||
d88aee68 | 2185 | metadata_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
04bb2b64 DG |
2186 | if (!metadata_ht) { |
2187 | /* ENOMEM at this point. Better to bail out. */ | |
d8ef542d | 2188 | goto end_ht; |
04bb2b64 DG |
2189 | } |
2190 | ||
fb3a43a9 DG |
2191 | DBG("Thread metadata poll started"); |
2192 | ||
fb3a43a9 DG |
2193 | /* Size is set to 1 for the consumer_metadata pipe */ |
2194 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
2195 | if (ret < 0) { | |
2196 | ERR("Poll set creation failed"); | |
d8ef542d | 2197 | goto end_poll; |
fb3a43a9 DG |
2198 | } |
2199 | ||
13886d2d DG |
2200 | ret = lttng_poll_add(&events, |
2201 | lttng_pipe_get_readfd(ctx->consumer_metadata_pipe), LPOLLIN); | |
fb3a43a9 DG |
2202 | if (ret < 0) { |
2203 | goto end; | |
2204 | } | |
2205 | ||
2206 | /* Main loop */ | |
2207 | DBG("Metadata main loop started"); | |
2208 | ||
2209 | while (1) { | |
fb3a43a9 | 2210 | /* Only the metadata pipe is set */ |
d21b0d71 | 2211 | if (LTTNG_POLL_GETNB(&events) == 0 && consumer_quit == 1) { |
fb3a43a9 DG |
2212 | goto end; |
2213 | } | |
2214 | ||
2215 | restart: | |
d21b0d71 | 2216 | DBG("Metadata poll wait with %d fd(s)", LTTNG_POLL_GETNB(&events)); |
fb3a43a9 DG |
2217 | ret = lttng_poll_wait(&events, -1); |
2218 | DBG("Metadata event catched in thread"); | |
2219 | if (ret < 0) { | |
2220 | if (errno == EINTR) { | |
e316aad5 | 2221 | ERR("Poll EINTR catched"); |
fb3a43a9 DG |
2222 | goto restart; |
2223 | } | |
2224 | goto error; | |
2225 | } | |
2226 | ||
0d9c5d77 DG |
2227 | nb_fd = ret; |
2228 | ||
e316aad5 | 2229 | /* From here, the event is a metadata wait fd */ |
fb3a43a9 DG |
2230 | for (i = 0; i < nb_fd; i++) { |
2231 | revents = LTTNG_POLL_GETEV(&events, i); | |
2232 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2233 | ||
e316aad5 DG |
2234 | /* Just don't waste time if no returned events for the fd */ |
2235 | if (!revents) { | |
2236 | continue; | |
2237 | } | |
2238 | ||
13886d2d | 2239 | if (pollfd == lttng_pipe_get_readfd(ctx->consumer_metadata_pipe)) { |
4adabd61 | 2240 | if (revents & (LPOLLERR | LPOLLHUP )) { |
fb3a43a9 DG |
2241 | DBG("Metadata thread pipe hung up"); |
2242 | /* | |
2243 | * Remove the pipe from the poll set and continue the loop | |
2244 | * since their might be data to consume. | |
2245 | */ | |
13886d2d DG |
2246 | lttng_poll_del(&events, |
2247 | lttng_pipe_get_readfd(ctx->consumer_metadata_pipe)); | |
2248 | lttng_pipe_read_close(ctx->consumer_metadata_pipe); | |
fb3a43a9 DG |
2249 | continue; |
2250 | } else if (revents & LPOLLIN) { | |
13886d2d DG |
2251 | ssize_t pipe_len; |
2252 | ||
2253 | pipe_len = lttng_pipe_read(ctx->consumer_metadata_pipe, | |
2254 | &stream, sizeof(stream)); | |
2255 | if (pipe_len < 0) { | |
c5c46de1 | 2256 | ERR("read metadata stream, ret: %zd", pipe_len); |
fb3a43a9 | 2257 | /* |
13886d2d | 2258 | * Continue here to handle the rest of the streams. |
fb3a43a9 DG |
2259 | */ |
2260 | continue; | |
2261 | } | |
2262 | ||
8994307f DG |
2263 | /* A NULL stream means that the state has changed. */ |
2264 | if (stream == NULL) { | |
2265 | /* Check for deleted streams. */ | |
2266 | validate_endpoint_status_metadata_stream(&events); | |
3714380f | 2267 | goto restart; |
8994307f DG |
2268 | } |
2269 | ||
fb3a43a9 DG |
2270 | DBG("Adding metadata stream %d to poll set", |
2271 | stream->wait_fd); | |
2272 | ||
fb3a43a9 DG |
2273 | /* Add metadata stream to the global poll events list */ |
2274 | lttng_poll_add(&events, stream->wait_fd, | |
2275 | LPOLLIN | LPOLLPRI); | |
fb3a43a9 DG |
2276 | } |
2277 | ||
e316aad5 | 2278 | /* Handle other stream */ |
fb3a43a9 DG |
2279 | continue; |
2280 | } | |
2281 | ||
d09e1200 | 2282 | rcu_read_lock(); |
d88aee68 DG |
2283 | { |
2284 | uint64_t tmp_id = (uint64_t) pollfd; | |
2285 | ||
2286 | lttng_ht_lookup(metadata_ht, &tmp_id, &iter); | |
2287 | } | |
2288 | node = lttng_ht_iter_get_node_u64(&iter); | |
e316aad5 | 2289 | assert(node); |
fb3a43a9 DG |
2290 | |
2291 | stream = caa_container_of(node, struct lttng_consumer_stream, | |
58b1f425 | 2292 | node); |
fb3a43a9 | 2293 | |
e316aad5 | 2294 | /* Check for error event */ |
4adabd61 | 2295 | if (revents & (LPOLLERR | LPOLLHUP)) { |
e316aad5 | 2296 | DBG("Metadata fd %d is hup|err.", pollfd); |
fb3a43a9 DG |
2297 | if (!stream->hangup_flush_done |
2298 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
2299 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
2300 | DBG("Attempting to flush and consume the UST buffers"); | |
2301 | lttng_ustconsumer_on_stream_hangup(stream); | |
2302 | ||
2303 | /* We just flushed the stream now read it. */ | |
4bb94b75 DG |
2304 | do { |
2305 | len = ctx->on_buffer_ready(stream, ctx); | |
2306 | /* | |
2307 | * We don't check the return value here since if we get | |
2308 | * a negative len, it means an error occured thus we | |
2309 | * simply remove it from the poll set and free the | |
2310 | * stream. | |
2311 | */ | |
2312 | } while (len > 0); | |
fb3a43a9 DG |
2313 | } |
2314 | ||
fb3a43a9 | 2315 | lttng_poll_del(&events, stream->wait_fd); |
e316aad5 DG |
2316 | /* |
2317 | * This call update the channel states, closes file descriptors | |
2318 | * and securely free the stream. | |
2319 | */ | |
2320 | consumer_del_metadata_stream(stream, metadata_ht); | |
2321 | } else if (revents & (LPOLLIN | LPOLLPRI)) { | |
2322 | /* Get the data out of the metadata file descriptor */ | |
2323 | DBG("Metadata available on fd %d", pollfd); | |
2324 | assert(stream->wait_fd == pollfd); | |
2325 | ||
2326 | len = ctx->on_buffer_ready(stream, ctx); | |
2327 | /* It's ok to have an unavailable sub-buffer */ | |
b64403e3 | 2328 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2329 | /* Clean up stream from consumer and free it. */ |
2330 | lttng_poll_del(&events, stream->wait_fd); | |
2331 | consumer_del_metadata_stream(stream, metadata_ht); | |
e316aad5 DG |
2332 | } else if (len > 0) { |
2333 | stream->data_read = 1; | |
2334 | } | |
fb3a43a9 | 2335 | } |
e316aad5 DG |
2336 | |
2337 | /* Release RCU lock for the stream looked up */ | |
d09e1200 | 2338 | rcu_read_unlock(); |
fb3a43a9 DG |
2339 | } |
2340 | } | |
2341 | ||
2342 | error: | |
2343 | end: | |
2344 | DBG("Metadata poll thread exiting"); | |
fb3a43a9 | 2345 | |
d8ef542d MD |
2346 | lttng_poll_clean(&events); |
2347 | end_poll: | |
04bb2b64 | 2348 | destroy_stream_ht(metadata_ht); |
d8ef542d | 2349 | end_ht: |
fb3a43a9 DG |
2350 | rcu_unregister_thread(); |
2351 | return NULL; | |
2352 | } | |
2353 | ||
3bd1e081 | 2354 | /* |
e4421fec | 2355 | * This thread polls the fds in the set to consume the data and write |
3bd1e081 MD |
2356 | * it to tracefile if necessary. |
2357 | */ | |
7d980def | 2358 | void *consumer_thread_data_poll(void *data) |
3bd1e081 MD |
2359 | { |
2360 | int num_rdy, num_hup, high_prio, ret, i; | |
2361 | struct pollfd *pollfd = NULL; | |
2362 | /* local view of the streams */ | |
c869f647 | 2363 | struct lttng_consumer_stream **local_stream = NULL, *new_stream = NULL; |
3bd1e081 MD |
2364 | /* local view of consumer_data.fds_count */ |
2365 | int nb_fd = 0; | |
3bd1e081 | 2366 | struct lttng_consumer_local_data *ctx = data; |
00e2e675 | 2367 | ssize_t len; |
3bd1e081 | 2368 | |
e7b994a3 DG |
2369 | rcu_register_thread(); |
2370 | ||
d88aee68 | 2371 | data_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
43c34bc3 | 2372 | if (data_ht == NULL) { |
04bb2b64 | 2373 | /* ENOMEM at this point. Better to bail out. */ |
43c34bc3 DG |
2374 | goto end; |
2375 | } | |
2376 | ||
e1eb1e0e MD |
2377 | local_stream = zmalloc(sizeof(struct lttng_consumer_stream *)); |
2378 | if (local_stream == NULL) { | |
2379 | PERROR("local_stream malloc"); | |
2380 | goto end; | |
2381 | } | |
3bd1e081 MD |
2382 | |
2383 | while (1) { | |
2384 | high_prio = 0; | |
2385 | num_hup = 0; | |
2386 | ||
2387 | /* | |
e4421fec | 2388 | * the fds set has been updated, we need to update our |
3bd1e081 MD |
2389 | * local array as well |
2390 | */ | |
2391 | pthread_mutex_lock(&consumer_data.lock); | |
2392 | if (consumer_data.need_update) { | |
0e428499 DG |
2393 | free(pollfd); |
2394 | pollfd = NULL; | |
2395 | ||
2396 | free(local_stream); | |
2397 | local_stream = NULL; | |
3bd1e081 | 2398 | |
50f8ae69 | 2399 | /* allocate for all fds + 1 for the consumer_data_pipe */ |
effcf122 | 2400 | pollfd = zmalloc((consumer_data.stream_count + 1) * sizeof(struct pollfd)); |
3bd1e081 | 2401 | if (pollfd == NULL) { |
7a57cf92 | 2402 | PERROR("pollfd malloc"); |
3bd1e081 MD |
2403 | pthread_mutex_unlock(&consumer_data.lock); |
2404 | goto end; | |
2405 | } | |
2406 | ||
50f8ae69 | 2407 | /* allocate for all fds + 1 for the consumer_data_pipe */ |
effcf122 | 2408 | local_stream = zmalloc((consumer_data.stream_count + 1) * |
747f8642 | 2409 | sizeof(struct lttng_consumer_stream *)); |
3bd1e081 | 2410 | if (local_stream == NULL) { |
7a57cf92 | 2411 | PERROR("local_stream malloc"); |
3bd1e081 MD |
2412 | pthread_mutex_unlock(&consumer_data.lock); |
2413 | goto end; | |
2414 | } | |
ffe60014 | 2415 | ret = update_poll_array(ctx, &pollfd, local_stream, |
43c34bc3 | 2416 | data_ht); |
3bd1e081 MD |
2417 | if (ret < 0) { |
2418 | ERR("Error in allocating pollfd or local_outfds"); | |
f73fabfd | 2419 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
2420 | pthread_mutex_unlock(&consumer_data.lock); |
2421 | goto end; | |
2422 | } | |
2423 | nb_fd = ret; | |
2424 | consumer_data.need_update = 0; | |
2425 | } | |
2426 | pthread_mutex_unlock(&consumer_data.lock); | |
2427 | ||
4078b776 MD |
2428 | /* No FDs and consumer_quit, consumer_cleanup the thread */ |
2429 | if (nb_fd == 0 && consumer_quit == 1) { | |
2430 | goto end; | |
2431 | } | |
3bd1e081 | 2432 | /* poll on the array of fds */ |
88f2b785 | 2433 | restart: |
3bd1e081 | 2434 | DBG("polling on %d fd", nb_fd + 1); |
cb365c03 | 2435 | num_rdy = poll(pollfd, nb_fd + 1, -1); |
3bd1e081 MD |
2436 | DBG("poll num_rdy : %d", num_rdy); |
2437 | if (num_rdy == -1) { | |
88f2b785 MD |
2438 | /* |
2439 | * Restart interrupted system call. | |
2440 | */ | |
2441 | if (errno == EINTR) { | |
2442 | goto restart; | |
2443 | } | |
7a57cf92 | 2444 | PERROR("Poll error"); |
f73fabfd | 2445 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
2446 | goto end; |
2447 | } else if (num_rdy == 0) { | |
2448 | DBG("Polling thread timed out"); | |
2449 | goto end; | |
2450 | } | |
2451 | ||
3bd1e081 | 2452 | /* |
50f8ae69 | 2453 | * If the consumer_data_pipe triggered poll go directly to the |
00e2e675 DG |
2454 | * beginning of the loop to update the array. We want to prioritize |
2455 | * array update over low-priority reads. | |
3bd1e081 | 2456 | */ |
509bb1cf | 2457 | if (pollfd[nb_fd].revents & (POLLIN | POLLPRI)) { |
ab30f567 | 2458 | ssize_t pipe_readlen; |
04fdd819 | 2459 | |
50f8ae69 | 2460 | DBG("consumer_data_pipe wake up"); |
acdb9057 DG |
2461 | pipe_readlen = lttng_pipe_read(ctx->consumer_data_pipe, |
2462 | &new_stream, sizeof(new_stream)); | |
23f5f35d | 2463 | if (pipe_readlen < 0) { |
c5c46de1 | 2464 | ERR("Consumer data pipe ret %zd", pipe_readlen); |
23f5f35d DG |
2465 | /* Continue so we can at least handle the current stream(s). */ |
2466 | continue; | |
2467 | } | |
c869f647 DG |
2468 | |
2469 | /* | |
2470 | * If the stream is NULL, just ignore it. It's also possible that | |
2471 | * the sessiond poll thread changed the consumer_quit state and is | |
2472 | * waking us up to test it. | |
2473 | */ | |
2474 | if (new_stream == NULL) { | |
8994307f | 2475 | validate_endpoint_status_data_stream(); |
c869f647 DG |
2476 | continue; |
2477 | } | |
2478 | ||
c869f647 | 2479 | /* Continue to update the local streams and handle prio ones */ |
3bd1e081 MD |
2480 | continue; |
2481 | } | |
2482 | ||
2483 | /* Take care of high priority channels first. */ | |
2484 | for (i = 0; i < nb_fd; i++) { | |
9617607b DG |
2485 | if (local_stream[i] == NULL) { |
2486 | continue; | |
2487 | } | |
fb3a43a9 | 2488 | if (pollfd[i].revents & POLLPRI) { |
d41f73b7 MD |
2489 | DBG("Urgent read on fd %d", pollfd[i].fd); |
2490 | high_prio = 1; | |
4078b776 | 2491 | len = ctx->on_buffer_ready(local_stream[i], ctx); |
d41f73b7 | 2492 | /* it's ok to have an unavailable sub-buffer */ |
b64403e3 | 2493 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2494 | /* Clean the stream and free it. */ |
2495 | consumer_del_stream(local_stream[i], data_ht); | |
9617607b | 2496 | local_stream[i] = NULL; |
4078b776 MD |
2497 | } else if (len > 0) { |
2498 | local_stream[i]->data_read = 1; | |
d41f73b7 | 2499 | } |
3bd1e081 MD |
2500 | } |
2501 | } | |
2502 | ||
4078b776 MD |
2503 | /* |
2504 | * If we read high prio channel in this loop, try again | |
2505 | * for more high prio data. | |
2506 | */ | |
2507 | if (high_prio) { | |
3bd1e081 MD |
2508 | continue; |
2509 | } | |
2510 | ||
2511 | /* Take care of low priority channels. */ | |
4078b776 | 2512 | for (i = 0; i < nb_fd; i++) { |
9617607b DG |
2513 | if (local_stream[i] == NULL) { |
2514 | continue; | |
2515 | } | |
4078b776 MD |
2516 | if ((pollfd[i].revents & POLLIN) || |
2517 | local_stream[i]->hangup_flush_done) { | |
4078b776 MD |
2518 | DBG("Normal read on fd %d", pollfd[i].fd); |
2519 | len = ctx->on_buffer_ready(local_stream[i], ctx); | |
2520 | /* it's ok to have an unavailable sub-buffer */ | |
b64403e3 | 2521 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2522 | /* Clean the stream and free it. */ |
2523 | consumer_del_stream(local_stream[i], data_ht); | |
9617607b | 2524 | local_stream[i] = NULL; |
4078b776 MD |
2525 | } else if (len > 0) { |
2526 | local_stream[i]->data_read = 1; | |
2527 | } | |
2528 | } | |
2529 | } | |
2530 | ||
2531 | /* Handle hangup and errors */ | |
2532 | for (i = 0; i < nb_fd; i++) { | |
9617607b DG |
2533 | if (local_stream[i] == NULL) { |
2534 | continue; | |
2535 | } | |
4078b776 MD |
2536 | if (!local_stream[i]->hangup_flush_done |
2537 | && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL)) | |
2538 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
2539 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
2540 | DBG("fd %d is hup|err|nval. Attempting flush and read.", | |
9617607b | 2541 | pollfd[i].fd); |
4078b776 MD |
2542 | lttng_ustconsumer_on_stream_hangup(local_stream[i]); |
2543 | /* Attempt read again, for the data we just flushed. */ | |
2544 | local_stream[i]->data_read = 1; | |
2545 | } | |
2546 | /* | |
2547 | * If the poll flag is HUP/ERR/NVAL and we have | |
2548 | * read no data in this pass, we can remove the | |
2549 | * stream from its hash table. | |
2550 | */ | |
2551 | if ((pollfd[i].revents & POLLHUP)) { | |
2552 | DBG("Polling fd %d tells it has hung up.", pollfd[i].fd); | |
2553 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2554 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2555 | local_stream[i] = NULL; |
4078b776 MD |
2556 | num_hup++; |
2557 | } | |
2558 | } else if (pollfd[i].revents & POLLERR) { | |
2559 | ERR("Error returned in polling fd %d.", pollfd[i].fd); | |
2560 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2561 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2562 | local_stream[i] = NULL; |
4078b776 MD |
2563 | num_hup++; |
2564 | } | |
2565 | } else if (pollfd[i].revents & POLLNVAL) { | |
2566 | ERR("Polling fd %d tells fd is not open.", pollfd[i].fd); | |
2567 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2568 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2569 | local_stream[i] = NULL; |
4078b776 | 2570 | num_hup++; |
3bd1e081 MD |
2571 | } |
2572 | } | |
9617607b DG |
2573 | if (local_stream[i] != NULL) { |
2574 | local_stream[i]->data_read = 0; | |
2575 | } | |
3bd1e081 MD |
2576 | } |
2577 | } | |
2578 | end: | |
2579 | DBG("polling thread exiting"); | |
0e428499 DG |
2580 | free(pollfd); |
2581 | free(local_stream); | |
fb3a43a9 DG |
2582 | |
2583 | /* | |
2584 | * Close the write side of the pipe so epoll_wait() in | |
7d980def DG |
2585 | * consumer_thread_metadata_poll can catch it. The thread is monitoring the |
2586 | * read side of the pipe. If we close them both, epoll_wait strangely does | |
2587 | * not return and could create a endless wait period if the pipe is the | |
2588 | * only tracked fd in the poll set. The thread will take care of closing | |
2589 | * the read side. | |
fb3a43a9 | 2590 | */ |
13886d2d | 2591 | (void) lttng_pipe_write_close(ctx->consumer_metadata_pipe); |
fb3a43a9 | 2592 | |
04bb2b64 | 2593 | destroy_data_stream_ht(data_ht); |
43c34bc3 | 2594 | |
e7b994a3 | 2595 | rcu_unregister_thread(); |
3bd1e081 MD |
2596 | return NULL; |
2597 | } | |
2598 | ||
d8ef542d MD |
2599 | /* |
2600 | * Close wake-up end of each stream belonging to the channel. This will | |
2601 | * allow the poll() on the stream read-side to detect when the | |
2602 | * write-side (application) finally closes them. | |
2603 | */ | |
2604 | static | |
2605 | void consumer_close_channel_streams(struct lttng_consumer_channel *channel) | |
2606 | { | |
2607 | struct lttng_ht *ht; | |
2608 | struct lttng_consumer_stream *stream; | |
2609 | struct lttng_ht_iter iter; | |
2610 | ||
2611 | ht = consumer_data.stream_per_chan_id_ht; | |
2612 | ||
2613 | rcu_read_lock(); | |
2614 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
2615 | ht->hash_fct(&channel->key, lttng_ht_seed), | |
2616 | ht->match_fct, &channel->key, | |
2617 | &iter.iter, stream, node_channel_id.node) { | |
f2ad556d MD |
2618 | /* |
2619 | * Protect against teardown with mutex. | |
2620 | */ | |
2621 | pthread_mutex_lock(&stream->lock); | |
2622 | if (cds_lfht_is_node_deleted(&stream->node.node)) { | |
2623 | goto next; | |
2624 | } | |
d8ef542d MD |
2625 | switch (consumer_data.type) { |
2626 | case LTTNG_CONSUMER_KERNEL: | |
2627 | break; | |
2628 | case LTTNG_CONSUMER32_UST: | |
2629 | case LTTNG_CONSUMER64_UST: | |
2630 | /* | |
2631 | * Note: a mutex is taken internally within | |
2632 | * liblttng-ust-ctl to protect timer wakeup_fd | |
2633 | * use from concurrent close. | |
2634 | */ | |
2635 | lttng_ustconsumer_close_stream_wakeup(stream); | |
2636 | break; | |
2637 | default: | |
2638 | ERR("Unknown consumer_data type"); | |
2639 | assert(0); | |
2640 | } | |
f2ad556d MD |
2641 | next: |
2642 | pthread_mutex_unlock(&stream->lock); | |
d8ef542d MD |
2643 | } |
2644 | rcu_read_unlock(); | |
2645 | } | |
2646 | ||
2647 | static void destroy_channel_ht(struct lttng_ht *ht) | |
2648 | { | |
2649 | struct lttng_ht_iter iter; | |
2650 | struct lttng_consumer_channel *channel; | |
2651 | int ret; | |
2652 | ||
2653 | if (ht == NULL) { | |
2654 | return; | |
2655 | } | |
2656 | ||
2657 | rcu_read_lock(); | |
2658 | cds_lfht_for_each_entry(ht->ht, &iter.iter, channel, wait_fd_node.node) { | |
2659 | ret = lttng_ht_del(ht, &iter); | |
2660 | assert(ret != 0); | |
2661 | } | |
2662 | rcu_read_unlock(); | |
2663 | ||
2664 | lttng_ht_destroy(ht); | |
2665 | } | |
2666 | ||
2667 | /* | |
2668 | * This thread polls the channel fds to detect when they are being | |
2669 | * closed. It closes all related streams if the channel is detected as | |
2670 | * closed. It is currently only used as a shim layer for UST because the | |
2671 | * consumerd needs to keep the per-stream wakeup end of pipes open for | |
2672 | * periodical flush. | |
2673 | */ | |
2674 | void *consumer_thread_channel_poll(void *data) | |
2675 | { | |
2676 | int ret, i, pollfd; | |
2677 | uint32_t revents, nb_fd; | |
2678 | struct lttng_consumer_channel *chan = NULL; | |
2679 | struct lttng_ht_iter iter; | |
2680 | struct lttng_ht_node_u64 *node; | |
2681 | struct lttng_poll_event events; | |
2682 | struct lttng_consumer_local_data *ctx = data; | |
2683 | struct lttng_ht *channel_ht; | |
2684 | ||
2685 | rcu_register_thread(); | |
2686 | ||
2687 | channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); | |
2688 | if (!channel_ht) { | |
2689 | /* ENOMEM at this point. Better to bail out. */ | |
2690 | goto end_ht; | |
2691 | } | |
2692 | ||
2693 | DBG("Thread channel poll started"); | |
2694 | ||
2695 | /* Size is set to 1 for the consumer_channel pipe */ | |
2696 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
2697 | if (ret < 0) { | |
2698 | ERR("Poll set creation failed"); | |
2699 | goto end_poll; | |
2700 | } | |
2701 | ||
2702 | ret = lttng_poll_add(&events, ctx->consumer_channel_pipe[0], LPOLLIN); | |
2703 | if (ret < 0) { | |
2704 | goto end; | |
2705 | } | |
2706 | ||
2707 | /* Main loop */ | |
2708 | DBG("Channel main loop started"); | |
2709 | ||
2710 | while (1) { | |
2711 | /* Only the channel pipe is set */ | |
2712 | if (LTTNG_POLL_GETNB(&events) == 0 && consumer_quit == 1) { | |
2713 | goto end; | |
2714 | } | |
2715 | ||
2716 | restart: | |
2717 | DBG("Channel poll wait with %d fd(s)", LTTNG_POLL_GETNB(&events)); | |
2718 | ret = lttng_poll_wait(&events, -1); | |
2719 | DBG("Channel event catched in thread"); | |
2720 | if (ret < 0) { | |
2721 | if (errno == EINTR) { | |
2722 | ERR("Poll EINTR catched"); | |
2723 | goto restart; | |
2724 | } | |
2725 | goto end; | |
2726 | } | |
2727 | ||
2728 | nb_fd = ret; | |
2729 | ||
2730 | /* From here, the event is a channel wait fd */ | |
2731 | for (i = 0; i < nb_fd; i++) { | |
2732 | revents = LTTNG_POLL_GETEV(&events, i); | |
2733 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2734 | ||
2735 | /* Just don't waste time if no returned events for the fd */ | |
2736 | if (!revents) { | |
2737 | continue; | |
2738 | } | |
2739 | if (pollfd == ctx->consumer_channel_pipe[0]) { | |
2740 | if (revents & (LPOLLERR | LPOLLHUP)) { | |
2741 | DBG("Channel thread pipe hung up"); | |
2742 | /* | |
2743 | * Remove the pipe from the poll set and continue the loop | |
2744 | * since their might be data to consume. | |
2745 | */ | |
2746 | lttng_poll_del(&events, ctx->consumer_channel_pipe[0]); | |
2747 | continue; | |
2748 | } else if (revents & LPOLLIN) { | |
2749 | enum consumer_channel_action action; | |
a0cbdd2e | 2750 | uint64_t key; |
d8ef542d | 2751 | |
a0cbdd2e | 2752 | ret = read_channel_pipe(ctx, &chan, &key, &action); |
d8ef542d MD |
2753 | if (ret <= 0) { |
2754 | ERR("Error reading channel pipe"); | |
2755 | continue; | |
2756 | } | |
2757 | ||
2758 | switch (action) { | |
2759 | case CONSUMER_CHANNEL_ADD: | |
2760 | DBG("Adding channel %d to poll set", | |
2761 | chan->wait_fd); | |
2762 | ||
2763 | lttng_ht_node_init_u64(&chan->wait_fd_node, | |
2764 | chan->wait_fd); | |
c7260a81 | 2765 | rcu_read_lock(); |
d8ef542d MD |
2766 | lttng_ht_add_unique_u64(channel_ht, |
2767 | &chan->wait_fd_node); | |
c7260a81 | 2768 | rcu_read_unlock(); |
d8ef542d MD |
2769 | /* Add channel to the global poll events list */ |
2770 | lttng_poll_add(&events, chan->wait_fd, | |
2771 | LPOLLIN | LPOLLPRI); | |
2772 | break; | |
a0cbdd2e MD |
2773 | case CONSUMER_CHANNEL_DEL: |
2774 | { | |
f2a444f1 DG |
2775 | struct lttng_consumer_stream *stream, *stmp; |
2776 | ||
c7260a81 | 2777 | rcu_read_lock(); |
a0cbdd2e MD |
2778 | chan = consumer_find_channel(key); |
2779 | if (!chan) { | |
c7260a81 | 2780 | rcu_read_unlock(); |
a0cbdd2e MD |
2781 | ERR("UST consumer get channel key %" PRIu64 " not found for del channel", key); |
2782 | break; | |
2783 | } | |
2784 | lttng_poll_del(&events, chan->wait_fd); | |
f623cc0b | 2785 | iter.iter.node = &chan->wait_fd_node.node; |
a0cbdd2e MD |
2786 | ret = lttng_ht_del(channel_ht, &iter); |
2787 | assert(ret == 0); | |
2788 | consumer_close_channel_streams(chan); | |
2789 | ||
f2a444f1 DG |
2790 | switch (consumer_data.type) { |
2791 | case LTTNG_CONSUMER_KERNEL: | |
2792 | break; | |
2793 | case LTTNG_CONSUMER32_UST: | |
2794 | case LTTNG_CONSUMER64_UST: | |
2795 | /* Delete streams that might have been left in the stream list. */ | |
2796 | cds_list_for_each_entry_safe(stream, stmp, &chan->streams.head, | |
2797 | send_node) { | |
2798 | cds_list_del(&stream->send_node); | |
2799 | lttng_ustconsumer_del_stream(stream); | |
2800 | uatomic_sub(&stream->chan->refcount, 1); | |
2801 | assert(&chan->refcount); | |
2802 | free(stream); | |
2803 | } | |
2804 | break; | |
2805 | default: | |
2806 | ERR("Unknown consumer_data type"); | |
2807 | assert(0); | |
2808 | } | |
2809 | ||
a0cbdd2e MD |
2810 | /* |
2811 | * Release our own refcount. Force channel deletion even if | |
2812 | * streams were not initialized. | |
2813 | */ | |
2814 | if (!uatomic_sub_return(&chan->refcount, 1)) { | |
2815 | consumer_del_channel(chan); | |
2816 | } | |
c7260a81 | 2817 | rcu_read_unlock(); |
a0cbdd2e MD |
2818 | goto restart; |
2819 | } | |
d8ef542d MD |
2820 | case CONSUMER_CHANNEL_QUIT: |
2821 | /* | |
2822 | * Remove the pipe from the poll set and continue the loop | |
2823 | * since their might be data to consume. | |
2824 | */ | |
2825 | lttng_poll_del(&events, ctx->consumer_channel_pipe[0]); | |
2826 | continue; | |
2827 | default: | |
2828 | ERR("Unknown action"); | |
2829 | break; | |
2830 | } | |
2831 | } | |
2832 | ||
2833 | /* Handle other stream */ | |
2834 | continue; | |
2835 | } | |
2836 | ||
2837 | rcu_read_lock(); | |
2838 | { | |
2839 | uint64_t tmp_id = (uint64_t) pollfd; | |
2840 | ||
2841 | lttng_ht_lookup(channel_ht, &tmp_id, &iter); | |
2842 | } | |
2843 | node = lttng_ht_iter_get_node_u64(&iter); | |
2844 | assert(node); | |
2845 | ||
2846 | chan = caa_container_of(node, struct lttng_consumer_channel, | |
2847 | wait_fd_node); | |
2848 | ||
2849 | /* Check for error event */ | |
2850 | if (revents & (LPOLLERR | LPOLLHUP)) { | |
2851 | DBG("Channel fd %d is hup|err.", pollfd); | |
2852 | ||
2853 | lttng_poll_del(&events, chan->wait_fd); | |
2854 | ret = lttng_ht_del(channel_ht, &iter); | |
2855 | assert(ret == 0); | |
f2a444f1 | 2856 | assert(cds_list_empty(&chan->streams.head)); |
d8ef542d | 2857 | consumer_close_channel_streams(chan); |
f2ad556d MD |
2858 | |
2859 | /* Release our own refcount */ | |
2860 | if (!uatomic_sub_return(&chan->refcount, 1) | |
2861 | && !uatomic_read(&chan->nb_init_stream_left)) { | |
2862 | consumer_del_channel(chan); | |
2863 | } | |
d8ef542d MD |
2864 | } |
2865 | ||
2866 | /* Release RCU lock for the channel looked up */ | |
2867 | rcu_read_unlock(); | |
2868 | } | |
2869 | } | |
2870 | ||
2871 | end: | |
2872 | lttng_poll_clean(&events); | |
2873 | end_poll: | |
2874 | destroy_channel_ht(channel_ht); | |
2875 | end_ht: | |
2876 | DBG("Channel poll thread exiting"); | |
2877 | rcu_unregister_thread(); | |
2878 | return NULL; | |
2879 | } | |
2880 | ||
331744e3 JD |
2881 | static int set_metadata_socket(struct lttng_consumer_local_data *ctx, |
2882 | struct pollfd *sockpoll, int client_socket) | |
2883 | { | |
2884 | int ret; | |
2885 | ||
2886 | assert(ctx); | |
2887 | assert(sockpoll); | |
2888 | ||
2889 | if (lttng_consumer_poll_socket(sockpoll) < 0) { | |
2890 | ret = -1; | |
2891 | goto error; | |
2892 | } | |
2893 | DBG("Metadata connection on client_socket"); | |
2894 | ||
2895 | /* Blocking call, waiting for transmission */ | |
2896 | ctx->consumer_metadata_socket = lttcomm_accept_unix_sock(client_socket); | |
2897 | if (ctx->consumer_metadata_socket < 0) { | |
2898 | WARN("On accept metadata"); | |
2899 | ret = -1; | |
2900 | goto error; | |
2901 | } | |
2902 | ret = 0; | |
2903 | ||
2904 | error: | |
2905 | return ret; | |
2906 | } | |
2907 | ||
3bd1e081 MD |
2908 | /* |
2909 | * This thread listens on the consumerd socket and receives the file | |
2910 | * descriptors from the session daemon. | |
2911 | */ | |
7d980def | 2912 | void *consumer_thread_sessiond_poll(void *data) |
3bd1e081 | 2913 | { |
d96f09c6 | 2914 | int sock = -1, client_socket, ret; |
3bd1e081 MD |
2915 | /* |
2916 | * structure to poll for incoming data on communication socket avoids | |
2917 | * making blocking sockets. | |
2918 | */ | |
2919 | struct pollfd consumer_sockpoll[2]; | |
2920 | struct lttng_consumer_local_data *ctx = data; | |
2921 | ||
e7b994a3 DG |
2922 | rcu_register_thread(); |
2923 | ||
3bd1e081 MD |
2924 | DBG("Creating command socket %s", ctx->consumer_command_sock_path); |
2925 | unlink(ctx->consumer_command_sock_path); | |
2926 | client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path); | |
2927 | if (client_socket < 0) { | |
2928 | ERR("Cannot create command socket"); | |
2929 | goto end; | |
2930 | } | |
2931 | ||
2932 | ret = lttcomm_listen_unix_sock(client_socket); | |
2933 | if (ret < 0) { | |
2934 | goto end; | |
2935 | } | |
2936 | ||
32258573 | 2937 | DBG("Sending ready command to lttng-sessiond"); |
f73fabfd | 2938 | ret = lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_COMMAND_SOCK_READY); |
3bd1e081 MD |
2939 | /* return < 0 on error, but == 0 is not fatal */ |
2940 | if (ret < 0) { | |
32258573 | 2941 | ERR("Error sending ready command to lttng-sessiond"); |
3bd1e081 MD |
2942 | goto end; |
2943 | } | |
2944 | ||
3bd1e081 MD |
2945 | /* prepare the FDs to poll : to client socket and the should_quit pipe */ |
2946 | consumer_sockpoll[0].fd = ctx->consumer_should_quit[0]; | |
2947 | consumer_sockpoll[0].events = POLLIN | POLLPRI; | |
2948 | consumer_sockpoll[1].fd = client_socket; | |
2949 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
2950 | ||
2951 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2952 | goto end; | |
2953 | } | |
2954 | DBG("Connection on client_socket"); | |
2955 | ||
2956 | /* Blocking call, waiting for transmission */ | |
2957 | sock = lttcomm_accept_unix_sock(client_socket); | |
534d2592 | 2958 | if (sock < 0) { |
3bd1e081 MD |
2959 | WARN("On accept"); |
2960 | goto end; | |
2961 | } | |
3bd1e081 | 2962 | |
331744e3 JD |
2963 | /* |
2964 | * Setup metadata socket which is the second socket connection on the | |
2965 | * command unix socket. | |
2966 | */ | |
2967 | ret = set_metadata_socket(ctx, consumer_sockpoll, client_socket); | |
2968 | if (ret < 0) { | |
2969 | goto end; | |
2970 | } | |
2971 | ||
d96f09c6 DG |
2972 | /* This socket is not useful anymore. */ |
2973 | ret = close(client_socket); | |
2974 | if (ret < 0) { | |
2975 | PERROR("close client_socket"); | |
2976 | } | |
2977 | client_socket = -1; | |
2978 | ||
3bd1e081 MD |
2979 | /* update the polling structure to poll on the established socket */ |
2980 | consumer_sockpoll[1].fd = sock; | |
2981 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
2982 | ||
2983 | while (1) { | |
2984 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2985 | goto end; | |
2986 | } | |
2987 | DBG("Incoming command on sock"); | |
2988 | ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
2989 | if (ret == -ENOENT) { | |
2990 | DBG("Received STOP command"); | |
2991 | goto end; | |
2992 | } | |
4cbc1a04 DG |
2993 | if (ret <= 0) { |
2994 | /* | |
2995 | * This could simply be a session daemon quitting. Don't output | |
2996 | * ERR() here. | |
2997 | */ | |
2998 | DBG("Communication interrupted on command socket"); | |
3bd1e081 MD |
2999 | goto end; |
3000 | } | |
3001 | if (consumer_quit) { | |
3002 | DBG("consumer_thread_receive_fds received quit from signal"); | |
3003 | goto end; | |
3004 | } | |
ffe60014 | 3005 | DBG("received command on sock"); |
3bd1e081 MD |
3006 | } |
3007 | end: | |
ffe60014 | 3008 | DBG("Consumer thread sessiond poll exiting"); |
3bd1e081 | 3009 | |
d88aee68 DG |
3010 | /* |
3011 | * Close metadata streams since the producer is the session daemon which | |
3012 | * just died. | |
3013 | * | |
3014 | * NOTE: for now, this only applies to the UST tracer. | |
3015 | */ | |
3016 | lttng_consumer_close_metadata(); | |
3017 | ||
3bd1e081 MD |
3018 | /* |
3019 | * when all fds have hung up, the polling thread | |
3020 | * can exit cleanly | |
3021 | */ | |
3022 | consumer_quit = 1; | |
3023 | ||
04fdd819 | 3024 | /* |
c869f647 | 3025 | * Notify the data poll thread to poll back again and test the |
8994307f | 3026 | * consumer_quit state that we just set so to quit gracefully. |
04fdd819 | 3027 | */ |
acdb9057 | 3028 | notify_thread_lttng_pipe(ctx->consumer_data_pipe); |
c869f647 | 3029 | |
a0cbdd2e | 3030 | notify_channel_pipe(ctx, NULL, -1, CONSUMER_CHANNEL_QUIT); |
d8ef542d | 3031 | |
d96f09c6 DG |
3032 | /* Cleaning up possibly open sockets. */ |
3033 | if (sock >= 0) { | |
3034 | ret = close(sock); | |
3035 | if (ret < 0) { | |
3036 | PERROR("close sock sessiond poll"); | |
3037 | } | |
3038 | } | |
3039 | if (client_socket >= 0) { | |
38476d24 | 3040 | ret = close(client_socket); |
d96f09c6 DG |
3041 | if (ret < 0) { |
3042 | PERROR("close client_socket sessiond poll"); | |
3043 | } | |
3044 | } | |
3045 | ||
e7b994a3 | 3046 | rcu_unregister_thread(); |
3bd1e081 MD |
3047 | return NULL; |
3048 | } | |
d41f73b7 | 3049 | |
4078b776 | 3050 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
3051 | struct lttng_consumer_local_data *ctx) |
3052 | { | |
74251bb8 DG |
3053 | ssize_t ret; |
3054 | ||
3055 | pthread_mutex_lock(&stream->lock); | |
3056 | ||
d41f73b7 MD |
3057 | switch (consumer_data.type) { |
3058 | case LTTNG_CONSUMER_KERNEL: | |
74251bb8 DG |
3059 | ret = lttng_kconsumer_read_subbuffer(stream, ctx); |
3060 | break; | |
7753dea8 MD |
3061 | case LTTNG_CONSUMER32_UST: |
3062 | case LTTNG_CONSUMER64_UST: | |
74251bb8 DG |
3063 | ret = lttng_ustconsumer_read_subbuffer(stream, ctx); |
3064 | break; | |
d41f73b7 MD |
3065 | default: |
3066 | ERR("Unknown consumer_data type"); | |
3067 | assert(0); | |
74251bb8 DG |
3068 | ret = -ENOSYS; |
3069 | break; | |
d41f73b7 | 3070 | } |
74251bb8 DG |
3071 | |
3072 | pthread_mutex_unlock(&stream->lock); | |
3073 | return ret; | |
d41f73b7 MD |
3074 | } |
3075 | ||
3076 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
3077 | { | |
3078 | switch (consumer_data.type) { | |
3079 | case LTTNG_CONSUMER_KERNEL: | |
3080 | return lttng_kconsumer_on_recv_stream(stream); | |
7753dea8 MD |
3081 | case LTTNG_CONSUMER32_UST: |
3082 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
3083 | return lttng_ustconsumer_on_recv_stream(stream); |
3084 | default: | |
3085 | ERR("Unknown consumer_data type"); | |
3086 | assert(0); | |
3087 | return -ENOSYS; | |
3088 | } | |
3089 | } | |
e4421fec DG |
3090 | |
3091 | /* | |
3092 | * Allocate and set consumer data hash tables. | |
3093 | */ | |
3094 | void lttng_consumer_init(void) | |
3095 | { | |
d88aee68 DG |
3096 | consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
3097 | consumer_data.relayd_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); | |
3098 | consumer_data.stream_list_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); | |
d8ef542d | 3099 | consumer_data.stream_per_chan_id_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
e4421fec | 3100 | } |
7735ef9e DG |
3101 | |
3102 | /* | |
3103 | * Process the ADD_RELAYD command receive by a consumer. | |
3104 | * | |
3105 | * This will create a relayd socket pair and add it to the relayd hash table. | |
3106 | * The caller MUST acquire a RCU read side lock before calling it. | |
3107 | */ | |
98cf381a | 3108 | int consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type, |
7735ef9e | 3109 | struct lttng_consumer_local_data *ctx, int sock, |
6151a90f | 3110 | struct pollfd *consumer_sockpoll, |
bcfa3ff9 | 3111 | struct lttcomm_relayd_sock *relayd_sock, uint64_t sessiond_id) |
7735ef9e | 3112 | { |
cd2b09ed | 3113 | int fd = -1, ret = -1, relayd_created = 0; |
f50f23d9 | 3114 | enum lttng_error_code ret_code = LTTNG_OK; |
d4298c99 | 3115 | struct consumer_relayd_sock_pair *relayd = NULL; |
7735ef9e | 3116 | |
6151a90f JD |
3117 | assert(ctx); |
3118 | assert(relayd_sock); | |
3119 | ||
98cf381a | 3120 | DBG("Consumer adding relayd socket (idx: %" PRIu64 ")", net_seq_idx); |
7735ef9e DG |
3121 | |
3122 | /* Get relayd reference if exists. */ | |
3123 | relayd = consumer_find_relayd(net_seq_idx); | |
3124 | if (relayd == NULL) { | |
98cf381a | 3125 | assert(sock_type == LTTNG_STREAM_CONTROL); |
7735ef9e DG |
3126 | /* Not found. Allocate one. */ |
3127 | relayd = consumer_allocate_relayd_sock_pair(net_seq_idx); | |
3128 | if (relayd == NULL) { | |
0d08d75e | 3129 | ret = -ENOMEM; |
e124929f MD |
3130 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; |
3131 | goto error; | |
0d08d75e | 3132 | } else { |
bcfa3ff9 | 3133 | relayd->sessiond_session_id = sessiond_id; |
0d08d75e | 3134 | relayd_created = 1; |
7735ef9e | 3135 | } |
0d08d75e DG |
3136 | |
3137 | /* | |
3138 | * This code path MUST continue to the consumer send status message to | |
3139 | * we can notify the session daemon and continue our work without | |
3140 | * killing everything. | |
3141 | */ | |
98cf381a MD |
3142 | } else { |
3143 | /* | |
3144 | * relayd key should never be found for control socket. | |
3145 | */ | |
3146 | assert(sock_type != LTTNG_STREAM_CONTROL); | |
0d08d75e DG |
3147 | } |
3148 | ||
3149 | /* First send a status message before receiving the fds. */ | |
e124929f MD |
3150 | ret = consumer_send_status_msg(sock, LTTNG_OK); |
3151 | if (ret < 0) { | |
0d08d75e | 3152 | /* Somehow, the session daemon is not responding anymore. */ |
e124929f MD |
3153 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL); |
3154 | goto error_nosignal; | |
7735ef9e DG |
3155 | } |
3156 | ||
3157 | /* Poll on consumer socket. */ | |
3158 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
0d08d75e | 3159 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
7735ef9e | 3160 | ret = -EINTR; |
e124929f | 3161 | goto error_nosignal; |
7735ef9e DG |
3162 | } |
3163 | ||
3164 | /* Get relayd socket from session daemon */ | |
3165 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); | |
3166 | if (ret != sizeof(fd)) { | |
7735ef9e | 3167 | ret = -1; |
4028eeb9 | 3168 | fd = -1; /* Just in case it gets set with an invalid value. */ |
0d08d75e DG |
3169 | |
3170 | /* | |
3171 | * Failing to receive FDs might indicate a major problem such as | |
3172 | * reaching a fd limit during the receive where the kernel returns a | |
3173 | * MSG_CTRUNC and fails to cleanup the fd in the queue. Any case, we | |
3174 | * don't take any chances and stop everything. | |
3175 | * | |
3176 | * XXX: Feature request #558 will fix that and avoid this possible | |
3177 | * issue when reaching the fd limit. | |
3178 | */ | |
3179 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); | |
e124929f | 3180 | ret_code = LTTCOMM_CONSUMERD_ERROR_RECV_FD; |
f50f23d9 DG |
3181 | goto error; |
3182 | } | |
3183 | ||
7735ef9e DG |
3184 | /* Copy socket information and received FD */ |
3185 | switch (sock_type) { | |
3186 | case LTTNG_STREAM_CONTROL: | |
3187 | /* Copy received lttcomm socket */ | |
6151a90f JD |
3188 | lttcomm_copy_sock(&relayd->control_sock.sock, &relayd_sock->sock); |
3189 | ret = lttcomm_create_sock(&relayd->control_sock.sock); | |
4028eeb9 | 3190 | /* Handle create_sock error. */ |
f66c074c | 3191 | if (ret < 0) { |
e124929f | 3192 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; |
4028eeb9 | 3193 | goto error; |
f66c074c | 3194 | } |
98cf381a MD |
3195 | /* |
3196 | * Close the socket created internally by | |
3197 | * lttcomm_create_sock, so we can replace it by the one | |
3198 | * received from sessiond. | |
3199 | */ | |
3200 | if (close(relayd->control_sock.sock.fd)) { | |
3201 | PERROR("close"); | |
3202 | } | |
7735ef9e DG |
3203 | |
3204 | /* Assign new file descriptor */ | |
6151a90f | 3205 | relayd->control_sock.sock.fd = fd; |
f1dab979 | 3206 | fd = -1; /* For error path */ |
6151a90f JD |
3207 | /* Assign version values. */ |
3208 | relayd->control_sock.major = relayd_sock->major; | |
3209 | relayd->control_sock.minor = relayd_sock->minor; | |
c5b6f4f0 DG |
3210 | |
3211 | /* | |
59e71485 DG |
3212 | * Create a session on the relayd and store the returned id. Lock the |
3213 | * control socket mutex if the relayd was NOT created before. | |
c5b6f4f0 | 3214 | */ |
59e71485 DG |
3215 | if (!relayd_created) { |
3216 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
3217 | } | |
c5b6f4f0 | 3218 | ret = relayd_create_session(&relayd->control_sock, |
f7079f67 | 3219 | &relayd->relayd_session_id); |
59e71485 DG |
3220 | if (!relayd_created) { |
3221 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
3222 | } | |
c5b6f4f0 | 3223 | if (ret < 0) { |
ffe60014 DG |
3224 | /* |
3225 | * Close all sockets of a relayd object. It will be freed if it was | |
3226 | * created at the error code path or else it will be garbage | |
3227 | * collect. | |
3228 | */ | |
3229 | (void) relayd_close(&relayd->control_sock); | |
3230 | (void) relayd_close(&relayd->data_sock); | |
e124929f | 3231 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
c5b6f4f0 DG |
3232 | goto error; |
3233 | } | |
3234 | ||
7735ef9e DG |
3235 | break; |
3236 | case LTTNG_STREAM_DATA: | |
3237 | /* Copy received lttcomm socket */ | |
6151a90f JD |
3238 | lttcomm_copy_sock(&relayd->data_sock.sock, &relayd_sock->sock); |
3239 | ret = lttcomm_create_sock(&relayd->data_sock.sock); | |
4028eeb9 | 3240 | /* Handle create_sock error. */ |
f66c074c | 3241 | if (ret < 0) { |
e124929f | 3242 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; |
4028eeb9 | 3243 | goto error; |
f66c074c | 3244 | } |
98cf381a MD |
3245 | /* |
3246 | * Close the socket created internally by | |
3247 | * lttcomm_create_sock, so we can replace it by the one | |
3248 | * received from sessiond. | |
3249 | */ | |
3250 | if (close(relayd->data_sock.sock.fd)) { | |
3251 | PERROR("close"); | |
3252 | } | |
7735ef9e DG |
3253 | |
3254 | /* Assign new file descriptor */ | |
6151a90f | 3255 | relayd->data_sock.sock.fd = fd; |
f1dab979 | 3256 | fd = -1; /* for eventual error paths */ |
6151a90f JD |
3257 | /* Assign version values. */ |
3258 | relayd->data_sock.major = relayd_sock->major; | |
3259 | relayd->data_sock.minor = relayd_sock->minor; | |
7735ef9e DG |
3260 | break; |
3261 | default: | |
3262 | ERR("Unknown relayd socket type (%d)", sock_type); | |
59e71485 | 3263 | ret = -1; |
e124929f | 3264 | ret_code = LTTCOMM_CONSUMERD_FATAL; |
7735ef9e DG |
3265 | goto error; |
3266 | } | |
3267 | ||
d88aee68 | 3268 | DBG("Consumer %s socket created successfully with net idx %" PRIu64 " (fd: %d)", |
7735ef9e DG |
3269 | sock_type == LTTNG_STREAM_CONTROL ? "control" : "data", |
3270 | relayd->net_seq_idx, fd); | |
3271 | ||
e124929f MD |
3272 | /* We successfully added the socket. Send status back. */ |
3273 | ret = consumer_send_status_msg(sock, ret_code); | |
3274 | if (ret < 0) { | |
3275 | /* Somehow, the session daemon is not responding anymore. */ | |
3276 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL); | |
3277 | goto error_nosignal; | |
3278 | } | |
3279 | ||
7735ef9e DG |
3280 | /* |
3281 | * Add relayd socket pair to consumer data hashtable. If object already | |
3282 | * exists or on error, the function gracefully returns. | |
3283 | */ | |
d09e1200 | 3284 | add_relayd(relayd); |
7735ef9e DG |
3285 | |
3286 | /* All good! */ | |
4028eeb9 | 3287 | return 0; |
7735ef9e DG |
3288 | |
3289 | error: | |
e124929f MD |
3290 | if (consumer_send_status_msg(sock, ret_code) < 0) { |
3291 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL); | |
3292 | } | |
3293 | ||
3294 | error_nosignal: | |
4028eeb9 DG |
3295 | /* Close received socket if valid. */ |
3296 | if (fd >= 0) { | |
3297 | if (close(fd)) { | |
3298 | PERROR("close received socket"); | |
3299 | } | |
3300 | } | |
cd2b09ed DG |
3301 | |
3302 | if (relayd_created) { | |
cd2b09ed DG |
3303 | free(relayd); |
3304 | } | |
3305 | ||
7735ef9e DG |
3306 | return ret; |
3307 | } | |
ca22feea | 3308 | |
4e9a4686 DG |
3309 | /* |
3310 | * Try to lock the stream mutex. | |
3311 | * | |
3312 | * On success, 1 is returned else 0 indicating that the mutex is NOT lock. | |
3313 | */ | |
3314 | static int stream_try_lock(struct lttng_consumer_stream *stream) | |
3315 | { | |
3316 | int ret; | |
3317 | ||
3318 | assert(stream); | |
3319 | ||
3320 | /* | |
3321 | * Try to lock the stream mutex. On failure, we know that the stream is | |
3322 | * being used else where hence there is data still being extracted. | |
3323 | */ | |
3324 | ret = pthread_mutex_trylock(&stream->lock); | |
3325 | if (ret) { | |
3326 | /* For both EBUSY and EINVAL error, the mutex is NOT locked. */ | |
3327 | ret = 0; | |
3328 | goto end; | |
3329 | } | |
3330 | ||
3331 | ret = 1; | |
3332 | ||
3333 | end: | |
3334 | return ret; | |
3335 | } | |
3336 | ||
f7079f67 DG |
3337 | /* |
3338 | * Search for a relayd associated to the session id and return the reference. | |
3339 | * | |
3340 | * A rcu read side lock MUST be acquire before calling this function and locked | |
3341 | * until the relayd object is no longer necessary. | |
3342 | */ | |
3343 | static struct consumer_relayd_sock_pair *find_relayd_by_session_id(uint64_t id) | |
3344 | { | |
3345 | struct lttng_ht_iter iter; | |
f7079f67 | 3346 | struct consumer_relayd_sock_pair *relayd = NULL; |
f7079f67 DG |
3347 | |
3348 | /* Iterate over all relayd since they are indexed by net_seq_idx. */ | |
3349 | cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd, | |
3350 | node.node) { | |
18261bd1 DG |
3351 | /* |
3352 | * Check by sessiond id which is unique here where the relayd session | |
3353 | * id might not be when having multiple relayd. | |
3354 | */ | |
3355 | if (relayd->sessiond_session_id == id) { | |
f7079f67 | 3356 | /* Found the relayd. There can be only one per id. */ |
18261bd1 | 3357 | goto found; |
f7079f67 DG |
3358 | } |
3359 | } | |
3360 | ||
18261bd1 DG |
3361 | return NULL; |
3362 | ||
3363 | found: | |
f7079f67 DG |
3364 | return relayd; |
3365 | } | |
3366 | ||
ca22feea DG |
3367 | /* |
3368 | * Check if for a given session id there is still data needed to be extract | |
3369 | * from the buffers. | |
3370 | * | |
6d805429 | 3371 | * Return 1 if data is pending or else 0 meaning ready to be read. |
ca22feea | 3372 | */ |
6d805429 | 3373 | int consumer_data_pending(uint64_t id) |
ca22feea DG |
3374 | { |
3375 | int ret; | |
3376 | struct lttng_ht_iter iter; | |
3377 | struct lttng_ht *ht; | |
3378 | struct lttng_consumer_stream *stream; | |
f7079f67 | 3379 | struct consumer_relayd_sock_pair *relayd = NULL; |
6d805429 | 3380 | int (*data_pending)(struct lttng_consumer_stream *); |
ca22feea | 3381 | |
6d805429 | 3382 | DBG("Consumer data pending command on session id %" PRIu64, id); |
ca22feea | 3383 | |
6f6eda74 | 3384 | rcu_read_lock(); |
ca22feea DG |
3385 | pthread_mutex_lock(&consumer_data.lock); |
3386 | ||
3387 | switch (consumer_data.type) { | |
3388 | case LTTNG_CONSUMER_KERNEL: | |
6d805429 | 3389 | data_pending = lttng_kconsumer_data_pending; |
ca22feea DG |
3390 | break; |
3391 | case LTTNG_CONSUMER32_UST: | |
3392 | case LTTNG_CONSUMER64_UST: | |
6d805429 | 3393 | data_pending = lttng_ustconsumer_data_pending; |
ca22feea DG |
3394 | break; |
3395 | default: | |
3396 | ERR("Unknown consumer data type"); | |
3397 | assert(0); | |
3398 | } | |
3399 | ||
3400 | /* Ease our life a bit */ | |
3401 | ht = consumer_data.stream_list_ht; | |
3402 | ||
f7079f67 DG |
3403 | relayd = find_relayd_by_session_id(id); |
3404 | if (relayd) { | |
3405 | /* Send init command for data pending. */ | |
3406 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
3407 | ret = relayd_begin_data_pending(&relayd->control_sock, | |
3408 | relayd->relayd_session_id); | |
3409 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
3410 | if (ret < 0) { | |
3411 | /* Communication error thus the relayd so no data pending. */ | |
3412 | goto data_not_pending; | |
3413 | } | |
3414 | } | |
3415 | ||
c8f59ee5 | 3416 | cds_lfht_for_each_entry_duplicate(ht->ht, |
d88aee68 DG |
3417 | ht->hash_fct(&id, lttng_ht_seed), |
3418 | ht->match_fct, &id, | |
ca22feea | 3419 | &iter.iter, stream, node_session_id.node) { |
4e9a4686 DG |
3420 | /* If this call fails, the stream is being used hence data pending. */ |
3421 | ret = stream_try_lock(stream); | |
3422 | if (!ret) { | |
f7079f67 | 3423 | goto data_pending; |
ca22feea | 3424 | } |
ca22feea | 3425 | |
4e9a4686 DG |
3426 | /* |
3427 | * A removed node from the hash table indicates that the stream has | |
3428 | * been deleted thus having a guarantee that the buffers are closed | |
3429 | * on the consumer side. However, data can still be transmitted | |
3430 | * over the network so don't skip the relayd check. | |
3431 | */ | |
3432 | ret = cds_lfht_is_node_deleted(&stream->node.node); | |
3433 | if (!ret) { | |
6d67e4b4 MD |
3434 | /* |
3435 | * An empty output file is not valid. We need at least one packet | |
3436 | * generated per stream, even if it contains no event, so it | |
3437 | * contains at least one packet header. | |
3438 | */ | |
3439 | if (stream->output_written == 0) { | |
3440 | pthread_mutex_unlock(&stream->lock); | |
3441 | goto data_pending; | |
3442 | } | |
4e9a4686 | 3443 | /* Check the stream if there is data in the buffers. */ |
6d805429 DG |
3444 | ret = data_pending(stream); |
3445 | if (ret == 1) { | |
4e9a4686 | 3446 | pthread_mutex_unlock(&stream->lock); |
f7079f67 | 3447 | goto data_pending; |
4e9a4686 DG |
3448 | } |
3449 | } | |
3450 | ||
3451 | /* Relayd check */ | |
f7079f67 | 3452 | if (relayd) { |
c8f59ee5 DG |
3453 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); |
3454 | if (stream->metadata_flag) { | |
ad7051c0 DG |
3455 | ret = relayd_quiescent_control(&relayd->control_sock, |
3456 | stream->relayd_stream_id); | |
c8f59ee5 | 3457 | } else { |
6d805429 | 3458 | ret = relayd_data_pending(&relayd->control_sock, |
39df6d9f DG |
3459 | stream->relayd_stream_id, |
3460 | stream->next_net_seq_num - 1); | |
c8f59ee5 DG |
3461 | } |
3462 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
6d805429 | 3463 | if (ret == 1) { |
4e9a4686 | 3464 | pthread_mutex_unlock(&stream->lock); |
f7079f67 | 3465 | goto data_pending; |
c8f59ee5 DG |
3466 | } |
3467 | } | |
4e9a4686 | 3468 | pthread_mutex_unlock(&stream->lock); |
c8f59ee5 | 3469 | } |
ca22feea | 3470 | |
f7079f67 DG |
3471 | if (relayd) { |
3472 | unsigned int is_data_inflight = 0; | |
3473 | ||
3474 | /* Send init command for data pending. */ | |
3475 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
3476 | ret = relayd_end_data_pending(&relayd->control_sock, | |
3477 | relayd->relayd_session_id, &is_data_inflight); | |
3478 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
bdd88757 | 3479 | if (ret < 0) { |
f7079f67 DG |
3480 | goto data_not_pending; |
3481 | } | |
bdd88757 DG |
3482 | if (is_data_inflight) { |
3483 | goto data_pending; | |
3484 | } | |
f7079f67 DG |
3485 | } |
3486 | ||
ca22feea | 3487 | /* |
f7079f67 DG |
3488 | * Finding _no_ node in the hash table and no inflight data means that the |
3489 | * stream(s) have been removed thus data is guaranteed to be available for | |
3490 | * analysis from the trace files. | |
ca22feea DG |
3491 | */ |
3492 | ||
f7079f67 | 3493 | data_not_pending: |
ca22feea DG |
3494 | /* Data is available to be read by a viewer. */ |
3495 | pthread_mutex_unlock(&consumer_data.lock); | |
c8f59ee5 | 3496 | rcu_read_unlock(); |
6d805429 | 3497 | return 0; |
ca22feea | 3498 | |
f7079f67 | 3499 | data_pending: |
ca22feea DG |
3500 | /* Data is still being extracted from buffers. */ |
3501 | pthread_mutex_unlock(&consumer_data.lock); | |
c8f59ee5 | 3502 | rcu_read_unlock(); |
6d805429 | 3503 | return 1; |
ca22feea | 3504 | } |
f50f23d9 DG |
3505 | |
3506 | /* | |
3507 | * Send a ret code status message to the sessiond daemon. | |
3508 | * | |
3509 | * Return the sendmsg() return value. | |
3510 | */ | |
3511 | int consumer_send_status_msg(int sock, int ret_code) | |
3512 | { | |
3513 | struct lttcomm_consumer_status_msg msg; | |
3514 | ||
3515 | msg.ret_code = ret_code; | |
3516 | ||
3517 | return lttcomm_send_unix_sock(sock, &msg, sizeof(msg)); | |
3518 | } | |
ffe60014 DG |
3519 | |
3520 | /* | |
3521 | * Send a channel status message to the sessiond daemon. | |
3522 | * | |
3523 | * Return the sendmsg() return value. | |
3524 | */ | |
3525 | int consumer_send_status_channel(int sock, | |
3526 | struct lttng_consumer_channel *channel) | |
3527 | { | |
3528 | struct lttcomm_consumer_status_channel msg; | |
3529 | ||
3530 | assert(sock >= 0); | |
3531 | ||
3532 | if (!channel) { | |
3533 | msg.ret_code = -LTTNG_ERR_UST_CHAN_FAIL; | |
3534 | } else { | |
3535 | msg.ret_code = LTTNG_OK; | |
3536 | msg.key = channel->key; | |
3537 | msg.stream_count = channel->streams.count; | |
3538 | } | |
3539 | ||
3540 | return lttcomm_send_unix_sock(sock, &msg, sizeof(msg)); | |
3541 | } |