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