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