Commit | Line | Data |
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3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
00e2e675 | 4 | * 2012 - David Goulet <dgoulet@efficios.com> |
3bd1e081 | 5 | * |
d14d33bf AM |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License, version 2 only, | |
8 | * as published by the Free Software Foundation. | |
3bd1e081 | 9 | * |
d14d33bf AM |
10 | * This program is distributed in the hope that it will be useful, but WITHOUT |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
3bd1e081 | 14 | * |
d14d33bf AM |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
3bd1e081 MD |
18 | */ |
19 | ||
20 | #define _GNU_SOURCE | |
21 | #include <assert.h> | |
3bd1e081 MD |
22 | #include <poll.h> |
23 | #include <pthread.h> | |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | #include <sys/mman.h> | |
27 | #include <sys/socket.h> | |
28 | #include <sys/types.h> | |
29 | #include <unistd.h> | |
77c7c900 | 30 | #include <inttypes.h> |
3bd1e081 | 31 | |
990570ed | 32 | #include <common/common.h> |
fb3a43a9 DG |
33 | #include <common/utils.h> |
34 | #include <common/compat/poll.h> | |
10a8a223 | 35 | #include <common/kernel-ctl/kernel-ctl.h> |
00e2e675 | 36 | #include <common/sessiond-comm/relayd.h> |
10a8a223 DG |
37 | #include <common/sessiond-comm/sessiond-comm.h> |
38 | #include <common/kernel-consumer/kernel-consumer.h> | |
00e2e675 | 39 | #include <common/relayd/relayd.h> |
10a8a223 DG |
40 | #include <common/ust-consumer/ust-consumer.h> |
41 | ||
42 | #include "consumer.h" | |
3bd1e081 MD |
43 | |
44 | struct lttng_consumer_global_data consumer_data = { | |
3bd1e081 MD |
45 | .stream_count = 0, |
46 | .need_update = 1, | |
47 | .type = LTTNG_CONSUMER_UNKNOWN, | |
48 | }; | |
49 | ||
3bd1e081 MD |
50 | /* |
51 | * Flag to inform the polling thread to quit when all fd hung up. Updated by | |
52 | * the consumer_thread_receive_fds when it notices that all fds has hung up. | |
53 | * Also updated by the signal handler (consumer_should_exit()). Read by the | |
54 | * polling threads. | |
55 | */ | |
a98dae5f | 56 | volatile int consumer_quit; |
3bd1e081 | 57 | |
43c34bc3 | 58 | /* |
43c34bc3 DG |
59 | * Global hash table containing respectively metadata and data streams. The |
60 | * stream element in this ht should only be updated by the metadata poll thread | |
61 | * for the metadata and the data poll thread for the data. | |
62 | */ | |
40dc48e0 DG |
63 | static struct lttng_ht *metadata_ht; |
64 | static struct lttng_ht *data_ht; | |
43c34bc3 | 65 | |
46e6455f DG |
66 | /* |
67 | * This hash table contains the mapping between the session id of the sessiond | |
68 | * and the relayd session id. Element of the ht are indexed by sessiond_id. | |
69 | * | |
70 | * Node can be added when a relayd communication is opened in the sessiond | |
71 | * thread. | |
72 | * | |
73 | * Note that a session id of the session daemon is unique to a tracing session | |
74 | * and not to a domain session. However, a domain session has one consumer | |
75 | * which forces the 1-1 mapping between a consumer and a domain session (ex: | |
76 | * UST). This means that we can't have duplicate in this ht. | |
77 | */ | |
78 | static struct lttng_ht *relayd_session_id_ht; | |
79 | ||
8994307f DG |
80 | /* |
81 | * Notify a thread pipe to poll back again. This usually means that some global | |
82 | * state has changed so we just send back the thread in a poll wait call. | |
83 | */ | |
84 | static void notify_thread_pipe(int wpipe) | |
85 | { | |
86 | int ret; | |
87 | ||
88 | do { | |
89 | struct lttng_consumer_stream *null_stream = NULL; | |
90 | ||
91 | ret = write(wpipe, &null_stream, sizeof(null_stream)); | |
92 | } while (ret < 0 && errno == EINTR); | |
93 | } | |
94 | ||
3bd1e081 MD |
95 | /* |
96 | * Find a stream. The consumer_data.lock must be locked during this | |
97 | * call. | |
98 | */ | |
8389e4f8 DG |
99 | static struct lttng_consumer_stream *consumer_find_stream(int key, |
100 | struct lttng_ht *ht) | |
3bd1e081 | 101 | { |
e4421fec DG |
102 | struct lttng_ht_iter iter; |
103 | struct lttng_ht_node_ulong *node; | |
104 | struct lttng_consumer_stream *stream = NULL; | |
3bd1e081 | 105 | |
8389e4f8 DG |
106 | assert(ht); |
107 | ||
7ad0a0cb | 108 | /* Negative keys are lookup failures */ |
7a57cf92 | 109 | if (key < 0) { |
7ad0a0cb | 110 | return NULL; |
7a57cf92 | 111 | } |
e4421fec | 112 | |
6065ceec DG |
113 | rcu_read_lock(); |
114 | ||
8389e4f8 | 115 | lttng_ht_lookup(ht, (void *)((unsigned long) key), &iter); |
e4421fec DG |
116 | node = lttng_ht_iter_get_node_ulong(&iter); |
117 | if (node != NULL) { | |
118 | stream = caa_container_of(node, struct lttng_consumer_stream, node); | |
3bd1e081 | 119 | } |
e4421fec | 120 | |
6065ceec DG |
121 | rcu_read_unlock(); |
122 | ||
e4421fec | 123 | return stream; |
3bd1e081 MD |
124 | } |
125 | ||
c869f647 | 126 | void consumer_steal_stream_key(int key, struct lttng_ht *ht) |
7ad0a0cb MD |
127 | { |
128 | struct lttng_consumer_stream *stream; | |
129 | ||
04253271 | 130 | rcu_read_lock(); |
8389e4f8 | 131 | stream = consumer_find_stream(key, ht); |
04253271 | 132 | if (stream) { |
7ad0a0cb | 133 | stream->key = -1; |
04253271 MD |
134 | /* |
135 | * We don't want the lookup to match, but we still need | |
136 | * to iterate on this stream when iterating over the hash table. Just | |
137 | * change the node key. | |
138 | */ | |
139 | stream->node.key = -1; | |
140 | } | |
141 | rcu_read_unlock(); | |
7ad0a0cb MD |
142 | } |
143 | ||
d56db448 DG |
144 | /* |
145 | * Return a channel object for the given key. | |
146 | * | |
147 | * RCU read side lock MUST be acquired before calling this function and | |
148 | * protects the channel ptr. | |
149 | */ | |
3bd1e081 MD |
150 | static struct lttng_consumer_channel *consumer_find_channel(int key) |
151 | { | |
e4421fec DG |
152 | struct lttng_ht_iter iter; |
153 | struct lttng_ht_node_ulong *node; | |
154 | struct lttng_consumer_channel *channel = NULL; | |
3bd1e081 | 155 | |
7ad0a0cb | 156 | /* Negative keys are lookup failures */ |
7a57cf92 | 157 | if (key < 0) { |
7ad0a0cb | 158 | return NULL; |
7a57cf92 | 159 | } |
e4421fec DG |
160 | |
161 | lttng_ht_lookup(consumer_data.channel_ht, (void *)((unsigned long) key), | |
162 | &iter); | |
163 | node = lttng_ht_iter_get_node_ulong(&iter); | |
164 | if (node != NULL) { | |
165 | channel = caa_container_of(node, struct lttng_consumer_channel, node); | |
3bd1e081 | 166 | } |
e4421fec DG |
167 | |
168 | return channel; | |
3bd1e081 MD |
169 | } |
170 | ||
7ad0a0cb MD |
171 | static void consumer_steal_channel_key(int key) |
172 | { | |
173 | struct lttng_consumer_channel *channel; | |
174 | ||
04253271 | 175 | rcu_read_lock(); |
7ad0a0cb | 176 | channel = consumer_find_channel(key); |
04253271 | 177 | if (channel) { |
7ad0a0cb | 178 | channel->key = -1; |
04253271 MD |
179 | /* |
180 | * We don't want the lookup to match, but we still need | |
181 | * to iterate on this channel when iterating over the hash table. Just | |
182 | * change the node key. | |
183 | */ | |
184 | channel->node.key = -1; | |
185 | } | |
186 | rcu_read_unlock(); | |
7ad0a0cb MD |
187 | } |
188 | ||
702b1ea4 MD |
189 | static |
190 | void consumer_free_stream(struct rcu_head *head) | |
191 | { | |
192 | struct lttng_ht_node_ulong *node = | |
193 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
194 | struct lttng_consumer_stream *stream = | |
195 | caa_container_of(node, struct lttng_consumer_stream, node); | |
196 | ||
197 | free(stream); | |
198 | } | |
199 | ||
00e2e675 DG |
200 | /* |
201 | * RCU protected relayd socket pair free. | |
202 | */ | |
203 | static void consumer_rcu_free_relayd(struct rcu_head *head) | |
204 | { | |
205 | struct lttng_ht_node_ulong *node = | |
206 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
207 | struct consumer_relayd_sock_pair *relayd = | |
208 | caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
209 | ||
8994307f DG |
210 | /* |
211 | * Close all sockets. This is done in the call RCU since we don't want the | |
212 | * socket fds to be reassigned thus potentially creating bad state of the | |
213 | * relayd object. | |
214 | * | |
215 | * We do not have to lock the control socket mutex here since at this stage | |
216 | * there is no one referencing to this relayd object. | |
217 | */ | |
218 | (void) relayd_close(&relayd->control_sock); | |
219 | (void) relayd_close(&relayd->data_sock); | |
220 | ||
00e2e675 DG |
221 | free(relayd); |
222 | } | |
223 | ||
224 | /* | |
225 | * Destroy and free relayd socket pair object. | |
226 | * | |
227 | * This function MUST be called with the consumer_data lock acquired. | |
228 | */ | |
d09e1200 | 229 | static void destroy_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
230 | { |
231 | int ret; | |
232 | struct lttng_ht_iter iter; | |
46e6455f | 233 | struct lttng_ht_node_ulong *node; |
00e2e675 | 234 | |
173af62f DG |
235 | if (relayd == NULL) { |
236 | return; | |
237 | } | |
238 | ||
00e2e675 DG |
239 | DBG("Consumer destroy and close relayd socket pair"); |
240 | ||
46e6455f DG |
241 | lttng_ht_lookup(relayd_session_id_ht, |
242 | (void *)((unsigned long) relayd->session_id), &iter); | |
243 | node = lttng_ht_iter_get_node_ulong(&iter); | |
244 | if (node != NULL) { | |
245 | /* We assume the relayd is being or is destroyed */ | |
246 | return; | |
247 | } | |
248 | ||
249 | ret = lttng_ht_del(relayd_session_id_ht, &iter); | |
250 | if (ret != 0) { | |
251 | /* We assume the relayd is being or is destroyed */ | |
252 | return; | |
253 | } | |
254 | ||
00e2e675 DG |
255 | iter.iter.node = &relayd->node.node; |
256 | ret = lttng_ht_del(consumer_data.relayd_ht, &iter); | |
173af62f | 257 | if (ret != 0) { |
8994307f | 258 | /* We assume the relayd is being or is destroyed */ |
173af62f DG |
259 | return; |
260 | } | |
00e2e675 | 261 | |
00e2e675 DG |
262 | /* RCU free() call */ |
263 | call_rcu(&relayd->node.head, consumer_rcu_free_relayd); | |
264 | } | |
265 | ||
228b5bf7 DG |
266 | /* |
267 | * Iterate over the relayd hash table and destroy each element. Finally, | |
268 | * destroy the whole hash table. | |
269 | */ | |
270 | static void cleanup_relayd_ht(void) | |
271 | { | |
272 | struct lttng_ht_iter iter; | |
273 | struct consumer_relayd_sock_pair *relayd; | |
274 | ||
275 | rcu_read_lock(); | |
276 | ||
277 | cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd, | |
278 | node.node) { | |
279 | destroy_relayd(relayd); | |
280 | } | |
281 | ||
282 | lttng_ht_destroy(consumer_data.relayd_ht); | |
283 | ||
284 | rcu_read_unlock(); | |
285 | } | |
286 | ||
8994307f DG |
287 | /* |
288 | * Update the end point status of all streams having the given network sequence | |
289 | * index (relayd index). | |
290 | * | |
291 | * It's atomically set without having the stream mutex locked which is fine | |
292 | * because we handle the write/read race with a pipe wakeup for each thread. | |
293 | */ | |
294 | static void update_endpoint_status_by_netidx(int net_seq_idx, | |
295 | enum consumer_endpoint_status status) | |
296 | { | |
297 | struct lttng_ht_iter iter; | |
298 | struct lttng_consumer_stream *stream; | |
299 | ||
300 | DBG("Consumer set delete flag on stream by idx %d", net_seq_idx); | |
301 | ||
302 | rcu_read_lock(); | |
303 | ||
304 | /* Let's begin with metadata */ | |
305 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) { | |
306 | if (stream->net_seq_idx == net_seq_idx) { | |
307 | uatomic_set(&stream->endpoint_status, status); | |
308 | DBG("Delete flag set to metadata stream %d", stream->wait_fd); | |
309 | } | |
310 | } | |
311 | ||
312 | /* Follow up by the data streams */ | |
313 | cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) { | |
314 | if (stream->net_seq_idx == net_seq_idx) { | |
315 | uatomic_set(&stream->endpoint_status, status); | |
316 | DBG("Delete flag set to data stream %d", stream->wait_fd); | |
317 | } | |
318 | } | |
319 | rcu_read_unlock(); | |
320 | } | |
321 | ||
322 | /* | |
323 | * Cleanup a relayd object by flagging every associated streams for deletion, | |
324 | * destroying the object meaning removing it from the relayd hash table, | |
325 | * closing the sockets and freeing the memory in a RCU call. | |
326 | * | |
327 | * If a local data context is available, notify the threads that the streams' | |
328 | * state have changed. | |
329 | */ | |
330 | static void cleanup_relayd(struct consumer_relayd_sock_pair *relayd, | |
331 | struct lttng_consumer_local_data *ctx) | |
332 | { | |
333 | int netidx; | |
334 | ||
335 | assert(relayd); | |
336 | ||
9617607b DG |
337 | DBG("Cleaning up relayd sockets"); |
338 | ||
8994307f DG |
339 | /* Save the net sequence index before destroying the object */ |
340 | netidx = relayd->net_seq_idx; | |
341 | ||
342 | /* | |
343 | * Delete the relayd from the relayd hash table, close the sockets and free | |
344 | * the object in a RCU call. | |
345 | */ | |
346 | destroy_relayd(relayd); | |
347 | ||
348 | /* Set inactive endpoint to all streams */ | |
349 | update_endpoint_status_by_netidx(netidx, CONSUMER_ENDPOINT_INACTIVE); | |
350 | ||
351 | /* | |
352 | * With a local data context, notify the threads that the streams' state | |
353 | * have changed. The write() action on the pipe acts as an "implicit" | |
354 | * memory barrier ordering the updates of the end point status from the | |
355 | * read of this status which happens AFTER receiving this notify. | |
356 | */ | |
357 | if (ctx) { | |
358 | notify_thread_pipe(ctx->consumer_data_pipe[1]); | |
359 | notify_thread_pipe(ctx->consumer_metadata_pipe[1]); | |
360 | } | |
361 | } | |
362 | ||
a6ba4fe1 DG |
363 | /* |
364 | * Flag a relayd socket pair for destruction. Destroy it if the refcount | |
365 | * reaches zero. | |
366 | * | |
367 | * RCU read side lock MUST be aquired before calling this function. | |
368 | */ | |
369 | void consumer_flag_relayd_for_destroy(struct consumer_relayd_sock_pair *relayd) | |
370 | { | |
371 | assert(relayd); | |
372 | ||
373 | /* Set destroy flag for this object */ | |
374 | uatomic_set(&relayd->destroy_flag, 1); | |
375 | ||
376 | /* Destroy the relayd if refcount is 0 */ | |
377 | if (uatomic_read(&relayd->refcount) == 0) { | |
d09e1200 | 378 | destroy_relayd(relayd); |
a6ba4fe1 DG |
379 | } |
380 | } | |
381 | ||
3bd1e081 MD |
382 | /* |
383 | * Remove a stream from the global list protected by a mutex. This | |
384 | * function is also responsible for freeing its data structures. | |
385 | */ | |
e316aad5 DG |
386 | void consumer_del_stream(struct lttng_consumer_stream *stream, |
387 | struct lttng_ht *ht) | |
3bd1e081 MD |
388 | { |
389 | int ret; | |
e4421fec | 390 | struct lttng_ht_iter iter; |
3bd1e081 | 391 | struct lttng_consumer_channel *free_chan = NULL; |
00e2e675 DG |
392 | struct consumer_relayd_sock_pair *relayd; |
393 | ||
394 | assert(stream); | |
3bd1e081 | 395 | |
8994307f DG |
396 | DBG("Consumer del stream %d", stream->wait_fd); |
397 | ||
e316aad5 DG |
398 | if (ht == NULL) { |
399 | /* Means the stream was allocated but not successfully added */ | |
400 | goto free_stream; | |
401 | } | |
402 | ||
3bd1e081 | 403 | pthread_mutex_lock(&consumer_data.lock); |
74251bb8 | 404 | pthread_mutex_lock(&stream->lock); |
3bd1e081 MD |
405 | |
406 | switch (consumer_data.type) { | |
407 | case LTTNG_CONSUMER_KERNEL: | |
408 | if (stream->mmap_base != NULL) { | |
409 | ret = munmap(stream->mmap_base, stream->mmap_len); | |
410 | if (ret != 0) { | |
7a57cf92 | 411 | PERROR("munmap"); |
3bd1e081 MD |
412 | } |
413 | } | |
414 | break; | |
7753dea8 MD |
415 | case LTTNG_CONSUMER32_UST: |
416 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
417 | lttng_ustconsumer_del_stream(stream); |
418 | break; | |
419 | default: | |
420 | ERR("Unknown consumer_data type"); | |
421 | assert(0); | |
422 | goto end; | |
423 | } | |
424 | ||
6065ceec | 425 | rcu_read_lock(); |
04253271 | 426 | iter.iter.node = &stream->node.node; |
e316aad5 | 427 | ret = lttng_ht_del(ht, &iter); |
04253271 | 428 | assert(!ret); |
ca22feea DG |
429 | |
430 | /* Remove node session id from the consumer_data stream ht */ | |
431 | iter.iter.node = &stream->node_session_id.node; | |
432 | ret = lttng_ht_del(consumer_data.stream_list_ht, &iter); | |
433 | assert(!ret); | |
6065ceec DG |
434 | rcu_read_unlock(); |
435 | ||
50f8ae69 | 436 | assert(consumer_data.stream_count > 0); |
3bd1e081 | 437 | consumer_data.stream_count--; |
50f8ae69 | 438 | |
3bd1e081 | 439 | if (stream->out_fd >= 0) { |
4c462e79 MD |
440 | ret = close(stream->out_fd); |
441 | if (ret) { | |
442 | PERROR("close"); | |
443 | } | |
3bd1e081 | 444 | } |
b5c5fc29 | 445 | if (stream->wait_fd >= 0 && !stream->wait_fd_is_copy) { |
4c462e79 MD |
446 | ret = close(stream->wait_fd); |
447 | if (ret) { | |
448 | PERROR("close"); | |
449 | } | |
3bd1e081 | 450 | } |
2c1dd183 | 451 | if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) { |
4c462e79 MD |
452 | ret = close(stream->shm_fd); |
453 | if (ret) { | |
454 | PERROR("close"); | |
455 | } | |
3bd1e081 | 456 | } |
00e2e675 DG |
457 | |
458 | /* Check and cleanup relayd */ | |
b0b335c8 | 459 | rcu_read_lock(); |
00e2e675 DG |
460 | relayd = consumer_find_relayd(stream->net_seq_idx); |
461 | if (relayd != NULL) { | |
b0b335c8 MD |
462 | uatomic_dec(&relayd->refcount); |
463 | assert(uatomic_read(&relayd->refcount) >= 0); | |
173af62f | 464 | |
3f8e211f DG |
465 | /* Closing streams requires to lock the control socket. */ |
466 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
173af62f DG |
467 | ret = relayd_send_close_stream(&relayd->control_sock, |
468 | stream->relayd_stream_id, | |
469 | stream->next_net_seq_num - 1); | |
3f8e211f | 470 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); |
173af62f | 471 | if (ret < 0) { |
a4b92340 DG |
472 | DBG("Unable to close stream on the relayd. Continuing"); |
473 | /* | |
474 | * Continue here. There is nothing we can do for the relayd. | |
475 | * Chances are that the relayd has closed the socket so we just | |
476 | * continue cleaning up. | |
477 | */ | |
173af62f DG |
478 | } |
479 | ||
480 | /* Both conditions are met, we destroy the relayd. */ | |
481 | if (uatomic_read(&relayd->refcount) == 0 && | |
482 | uatomic_read(&relayd->destroy_flag)) { | |
d09e1200 | 483 | destroy_relayd(relayd); |
00e2e675 | 484 | } |
00e2e675 | 485 | } |
b0b335c8 | 486 | rcu_read_unlock(); |
00e2e675 | 487 | |
c30aaa51 MD |
488 | uatomic_dec(&stream->chan->refcount); |
489 | if (!uatomic_read(&stream->chan->refcount) | |
490 | && !uatomic_read(&stream->chan->nb_init_streams)) { | |
3bd1e081 | 491 | free_chan = stream->chan; |
00e2e675 DG |
492 | } |
493 | ||
3bd1e081 MD |
494 | end: |
495 | consumer_data.need_update = 1; | |
8994307f | 496 | pthread_mutex_unlock(&stream->lock); |
74251bb8 | 497 | pthread_mutex_unlock(&consumer_data.lock); |
3bd1e081 | 498 | |
c30aaa51 | 499 | if (free_chan) { |
3bd1e081 | 500 | consumer_del_channel(free_chan); |
c30aaa51 | 501 | } |
e316aad5 DG |
502 | |
503 | free_stream: | |
504 | call_rcu(&stream->node.head, consumer_free_stream); | |
3bd1e081 MD |
505 | } |
506 | ||
507 | struct lttng_consumer_stream *consumer_allocate_stream( | |
508 | int channel_key, int stream_key, | |
509 | int shm_fd, int wait_fd, | |
510 | enum lttng_consumer_stream_state state, | |
511 | uint64_t mmap_len, | |
512 | enum lttng_event_output output, | |
6df2e2c9 MD |
513 | const char *path_name, |
514 | uid_t uid, | |
00e2e675 DG |
515 | gid_t gid, |
516 | int net_index, | |
c80048c6 | 517 | int metadata_flag, |
53632229 | 518 | uint64_t session_id, |
c80048c6 | 519 | int *alloc_ret) |
3bd1e081 MD |
520 | { |
521 | struct lttng_consumer_stream *stream; | |
3bd1e081 | 522 | |
effcf122 | 523 | stream = zmalloc(sizeof(*stream)); |
3bd1e081 | 524 | if (stream == NULL) { |
7a57cf92 | 525 | PERROR("malloc struct lttng_consumer_stream"); |
c80048c6 | 526 | *alloc_ret = -ENOMEM; |
7a57cf92 | 527 | goto end; |
3bd1e081 | 528 | } |
7a57cf92 | 529 | |
d56db448 DG |
530 | rcu_read_lock(); |
531 | ||
7a57cf92 DG |
532 | /* |
533 | * Get stream's channel reference. Needed when adding the stream to the | |
534 | * global hash table. | |
535 | */ | |
3bd1e081 MD |
536 | stream->chan = consumer_find_channel(channel_key); |
537 | if (!stream->chan) { | |
c80048c6 | 538 | *alloc_ret = -ENOENT; |
7a57cf92 | 539 | ERR("Unable to find channel for stream %d", stream_key); |
c80048c6 | 540 | goto error; |
3bd1e081 | 541 | } |
e316aad5 | 542 | |
3bd1e081 MD |
543 | stream->key = stream_key; |
544 | stream->shm_fd = shm_fd; | |
545 | stream->wait_fd = wait_fd; | |
546 | stream->out_fd = -1; | |
547 | stream->out_fd_offset = 0; | |
548 | stream->state = state; | |
549 | stream->mmap_len = mmap_len; | |
550 | stream->mmap_base = NULL; | |
551 | stream->output = output; | |
6df2e2c9 MD |
552 | stream->uid = uid; |
553 | stream->gid = gid; | |
00e2e675 DG |
554 | stream->net_seq_idx = net_index; |
555 | stream->metadata_flag = metadata_flag; | |
53632229 | 556 | stream->session_id = session_id; |
00e2e675 DG |
557 | strncpy(stream->path_name, path_name, sizeof(stream->path_name)); |
558 | stream->path_name[sizeof(stream->path_name) - 1] = '\0'; | |
53632229 | 559 | pthread_mutex_init(&stream->lock, NULL); |
58b1f425 DG |
560 | |
561 | /* | |
562 | * Index differently the metadata node because the thread is using an | |
563 | * internal hash table to match streams in the metadata_ht to the epoll set | |
564 | * file descriptor. | |
565 | */ | |
566 | if (metadata_flag) { | |
567 | lttng_ht_node_init_ulong(&stream->node, stream->wait_fd); | |
568 | } else { | |
569 | lttng_ht_node_init_ulong(&stream->node, stream->key); | |
570 | } | |
c30aaa51 | 571 | |
53632229 DG |
572 | /* Init session id node with the stream session id */ |
573 | lttng_ht_node_init_ulong(&stream->node_session_id, stream->session_id); | |
574 | ||
c869f647 DG |
575 | /* |
576 | * The cpu number is needed before using any ustctl_* actions. Ignored for | |
577 | * the kernel so the value does not matter. | |
578 | */ | |
579 | pthread_mutex_lock(&consumer_data.lock); | |
580 | stream->cpu = stream->chan->cpucount++; | |
581 | pthread_mutex_unlock(&consumer_data.lock); | |
582 | ||
c30aaa51 | 583 | DBG3("Allocated stream %s (key %d, shm_fd %d, wait_fd %d, mmap_len %llu," |
53632229 DG |
584 | " out_fd %d, net_seq_idx %d, session_id %" PRIu64, |
585 | stream->path_name, stream->key, stream->shm_fd, stream->wait_fd, | |
c30aaa51 | 586 | (unsigned long long) stream->mmap_len, stream->out_fd, |
53632229 | 587 | stream->net_seq_idx, stream->session_id); |
d56db448 DG |
588 | |
589 | rcu_read_unlock(); | |
3bd1e081 | 590 | return stream; |
c80048c6 MD |
591 | |
592 | error: | |
d56db448 | 593 | rcu_read_unlock(); |
c80048c6 | 594 | free(stream); |
7a57cf92 | 595 | end: |
c80048c6 | 596 | return NULL; |
3bd1e081 MD |
597 | } |
598 | ||
599 | /* | |
600 | * Add a stream to the global list protected by a mutex. | |
601 | */ | |
43c34bc3 DG |
602 | static int consumer_add_stream(struct lttng_consumer_stream *stream, |
603 | struct lttng_ht *ht) | |
3bd1e081 MD |
604 | { |
605 | int ret = 0; | |
00e2e675 | 606 | struct consumer_relayd_sock_pair *relayd; |
3bd1e081 | 607 | |
e316aad5 | 608 | assert(stream); |
43c34bc3 | 609 | assert(ht); |
c77fc10a | 610 | |
e316aad5 DG |
611 | DBG3("Adding consumer stream %d", stream->key); |
612 | ||
613 | pthread_mutex_lock(&consumer_data.lock); | |
2e818a6a | 614 | pthread_mutex_lock(&stream->lock); |
b0b335c8 | 615 | rcu_read_lock(); |
e316aad5 | 616 | |
43c34bc3 DG |
617 | /* Steal stream identifier to avoid having streams with the same key */ |
618 | consumer_steal_stream_key(stream->key, ht); | |
619 | ||
620 | lttng_ht_add_unique_ulong(ht, &stream->node); | |
00e2e675 | 621 | |
ca22feea DG |
622 | /* |
623 | * Add stream to the stream_list_ht of the consumer data. No need to steal | |
624 | * the key since the HT does not use it and we allow to add redundant keys | |
625 | * into this table. | |
626 | */ | |
627 | lttng_ht_add_ulong(consumer_data.stream_list_ht, &stream->node_session_id); | |
628 | ||
00e2e675 DG |
629 | /* Check and cleanup relayd */ |
630 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
631 | if (relayd != NULL) { | |
b0b335c8 | 632 | uatomic_inc(&relayd->refcount); |
00e2e675 DG |
633 | } |
634 | ||
e316aad5 DG |
635 | /* Update channel refcount once added without error(s). */ |
636 | uatomic_inc(&stream->chan->refcount); | |
637 | ||
638 | /* | |
639 | * When nb_init_streams reaches 0, we don't need to trigger any action in | |
640 | * terms of destroying the associated channel, because the action that | |
641 | * causes the count to become 0 also causes a stream to be added. The | |
642 | * channel deletion will thus be triggered by the following removal of this | |
643 | * stream. | |
644 | */ | |
645 | if (uatomic_read(&stream->chan->nb_init_streams) > 0) { | |
646 | uatomic_dec(&stream->chan->nb_init_streams); | |
647 | } | |
648 | ||
649 | /* Update consumer data once the node is inserted. */ | |
3bd1e081 MD |
650 | consumer_data.stream_count++; |
651 | consumer_data.need_update = 1; | |
652 | ||
e316aad5 | 653 | rcu_read_unlock(); |
2e818a6a | 654 | pthread_mutex_unlock(&stream->lock); |
3bd1e081 | 655 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 656 | |
3bd1e081 MD |
657 | return ret; |
658 | } | |
659 | ||
00e2e675 | 660 | /* |
3f8e211f DG |
661 | * Add relayd socket to global consumer data hashtable. RCU read side lock MUST |
662 | * be acquired before calling this. | |
00e2e675 | 663 | */ |
d09e1200 | 664 | static int add_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
665 | { |
666 | int ret = 0; | |
667 | struct lttng_ht_node_ulong *node; | |
668 | struct lttng_ht_iter iter; | |
669 | ||
670 | if (relayd == NULL) { | |
671 | ret = -1; | |
672 | goto end; | |
673 | } | |
674 | ||
00e2e675 DG |
675 | lttng_ht_lookup(consumer_data.relayd_ht, |
676 | (void *)((unsigned long) relayd->net_seq_idx), &iter); | |
677 | node = lttng_ht_iter_get_node_ulong(&iter); | |
678 | if (node != NULL) { | |
00e2e675 DG |
679 | /* Relayd already exist. Ignore the insertion */ |
680 | goto end; | |
681 | } | |
682 | lttng_ht_add_unique_ulong(consumer_data.relayd_ht, &relayd->node); | |
683 | ||
00e2e675 DG |
684 | end: |
685 | return ret; | |
686 | } | |
687 | ||
688 | /* | |
689 | * Allocate and return a consumer relayd socket. | |
690 | */ | |
691 | struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair( | |
692 | int net_seq_idx) | |
693 | { | |
694 | struct consumer_relayd_sock_pair *obj = NULL; | |
695 | ||
696 | /* Negative net sequence index is a failure */ | |
697 | if (net_seq_idx < 0) { | |
698 | goto error; | |
699 | } | |
700 | ||
701 | obj = zmalloc(sizeof(struct consumer_relayd_sock_pair)); | |
702 | if (obj == NULL) { | |
703 | PERROR("zmalloc relayd sock"); | |
704 | goto error; | |
705 | } | |
706 | ||
707 | obj->net_seq_idx = net_seq_idx; | |
708 | obj->refcount = 0; | |
173af62f | 709 | obj->destroy_flag = 0; |
00e2e675 DG |
710 | lttng_ht_node_init_ulong(&obj->node, obj->net_seq_idx); |
711 | pthread_mutex_init(&obj->ctrl_sock_mutex, NULL); | |
712 | ||
713 | error: | |
714 | return obj; | |
715 | } | |
716 | ||
717 | /* | |
718 | * Find a relayd socket pair in the global consumer data. | |
719 | * | |
720 | * Return the object if found else NULL. | |
b0b335c8 MD |
721 | * RCU read-side lock must be held across this call and while using the |
722 | * returned object. | |
00e2e675 DG |
723 | */ |
724 | struct consumer_relayd_sock_pair *consumer_find_relayd(int key) | |
725 | { | |
726 | struct lttng_ht_iter iter; | |
727 | struct lttng_ht_node_ulong *node; | |
728 | struct consumer_relayd_sock_pair *relayd = NULL; | |
729 | ||
730 | /* Negative keys are lookup failures */ | |
731 | if (key < 0) { | |
732 | goto error; | |
733 | } | |
734 | ||
00e2e675 DG |
735 | lttng_ht_lookup(consumer_data.relayd_ht, (void *)((unsigned long) key), |
736 | &iter); | |
737 | node = lttng_ht_iter_get_node_ulong(&iter); | |
738 | if (node != NULL) { | |
739 | relayd = caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
740 | } | |
741 | ||
00e2e675 DG |
742 | error: |
743 | return relayd; | |
744 | } | |
745 | ||
746 | /* | |
747 | * Handle stream for relayd transmission if the stream applies for network | |
748 | * streaming where the net sequence index is set. | |
749 | * | |
750 | * Return destination file descriptor or negative value on error. | |
751 | */ | |
6197aea7 | 752 | static int write_relayd_stream_header(struct lttng_consumer_stream *stream, |
1d4dfdef DG |
753 | size_t data_size, unsigned long padding, |
754 | struct consumer_relayd_sock_pair *relayd) | |
00e2e675 DG |
755 | { |
756 | int outfd = -1, ret; | |
00e2e675 DG |
757 | struct lttcomm_relayd_data_hdr data_hdr; |
758 | ||
759 | /* Safety net */ | |
760 | assert(stream); | |
6197aea7 | 761 | assert(relayd); |
00e2e675 DG |
762 | |
763 | /* Reset data header */ | |
764 | memset(&data_hdr, 0, sizeof(data_hdr)); | |
765 | ||
00e2e675 DG |
766 | if (stream->metadata_flag) { |
767 | /* Caller MUST acquire the relayd control socket lock */ | |
768 | ret = relayd_send_metadata(&relayd->control_sock, data_size); | |
769 | if (ret < 0) { | |
770 | goto error; | |
771 | } | |
772 | ||
773 | /* Metadata are always sent on the control socket. */ | |
774 | outfd = relayd->control_sock.fd; | |
775 | } else { | |
776 | /* Set header with stream information */ | |
777 | data_hdr.stream_id = htobe64(stream->relayd_stream_id); | |
778 | data_hdr.data_size = htobe32(data_size); | |
1d4dfdef | 779 | data_hdr.padding_size = htobe32(padding); |
173af62f | 780 | data_hdr.net_seq_num = htobe64(stream->next_net_seq_num++); |
00e2e675 DG |
781 | /* Other fields are zeroed previously */ |
782 | ||
783 | ret = relayd_send_data_hdr(&relayd->data_sock, &data_hdr, | |
784 | sizeof(data_hdr)); | |
785 | if (ret < 0) { | |
786 | goto error; | |
787 | } | |
788 | ||
789 | /* Set to go on data socket */ | |
790 | outfd = relayd->data_sock.fd; | |
791 | } | |
792 | ||
793 | error: | |
794 | return outfd; | |
795 | } | |
796 | ||
702b1ea4 MD |
797 | static |
798 | void consumer_free_channel(struct rcu_head *head) | |
799 | { | |
800 | struct lttng_ht_node_ulong *node = | |
801 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
802 | struct lttng_consumer_channel *channel = | |
803 | caa_container_of(node, struct lttng_consumer_channel, node); | |
804 | ||
805 | free(channel); | |
806 | } | |
807 | ||
3bd1e081 MD |
808 | /* |
809 | * Remove a channel from the global list protected by a mutex. This | |
810 | * function is also responsible for freeing its data structures. | |
811 | */ | |
812 | void consumer_del_channel(struct lttng_consumer_channel *channel) | |
813 | { | |
814 | int ret; | |
e4421fec | 815 | struct lttng_ht_iter iter; |
3bd1e081 | 816 | |
5c540210 DG |
817 | DBG("Consumer delete channel key %d", channel->key); |
818 | ||
3bd1e081 MD |
819 | pthread_mutex_lock(&consumer_data.lock); |
820 | ||
821 | switch (consumer_data.type) { | |
822 | case LTTNG_CONSUMER_KERNEL: | |
823 | break; | |
7753dea8 MD |
824 | case LTTNG_CONSUMER32_UST: |
825 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
826 | lttng_ustconsumer_del_channel(channel); |
827 | break; | |
828 | default: | |
829 | ERR("Unknown consumer_data type"); | |
830 | assert(0); | |
831 | goto end; | |
832 | } | |
833 | ||
6065ceec | 834 | rcu_read_lock(); |
04253271 MD |
835 | iter.iter.node = &channel->node.node; |
836 | ret = lttng_ht_del(consumer_data.channel_ht, &iter); | |
837 | assert(!ret); | |
6065ceec DG |
838 | rcu_read_unlock(); |
839 | ||
3bd1e081 MD |
840 | if (channel->mmap_base != NULL) { |
841 | ret = munmap(channel->mmap_base, channel->mmap_len); | |
842 | if (ret != 0) { | |
7a57cf92 | 843 | PERROR("munmap"); |
3bd1e081 MD |
844 | } |
845 | } | |
b5c5fc29 | 846 | if (channel->wait_fd >= 0 && !channel->wait_fd_is_copy) { |
4c462e79 MD |
847 | ret = close(channel->wait_fd); |
848 | if (ret) { | |
849 | PERROR("close"); | |
850 | } | |
3bd1e081 | 851 | } |
2c1dd183 | 852 | if (channel->shm_fd >= 0 && channel->wait_fd != channel->shm_fd) { |
4c462e79 MD |
853 | ret = close(channel->shm_fd); |
854 | if (ret) { | |
855 | PERROR("close"); | |
856 | } | |
3bd1e081 | 857 | } |
702b1ea4 MD |
858 | |
859 | call_rcu(&channel->node.head, consumer_free_channel); | |
3bd1e081 MD |
860 | end: |
861 | pthread_mutex_unlock(&consumer_data.lock); | |
862 | } | |
863 | ||
864 | struct lttng_consumer_channel *consumer_allocate_channel( | |
865 | int channel_key, | |
866 | int shm_fd, int wait_fd, | |
867 | uint64_t mmap_len, | |
c30aaa51 MD |
868 | uint64_t max_sb_size, |
869 | unsigned int nb_init_streams) | |
3bd1e081 MD |
870 | { |
871 | struct lttng_consumer_channel *channel; | |
872 | int ret; | |
873 | ||
276b26d1 | 874 | channel = zmalloc(sizeof(*channel)); |
3bd1e081 | 875 | if (channel == NULL) { |
7a57cf92 | 876 | PERROR("malloc struct lttng_consumer_channel"); |
3bd1e081 MD |
877 | goto end; |
878 | } | |
879 | channel->key = channel_key; | |
880 | channel->shm_fd = shm_fd; | |
881 | channel->wait_fd = wait_fd; | |
882 | channel->mmap_len = mmap_len; | |
883 | channel->max_sb_size = max_sb_size; | |
884 | channel->refcount = 0; | |
c30aaa51 | 885 | channel->nb_init_streams = nb_init_streams; |
e4421fec | 886 | lttng_ht_node_init_ulong(&channel->node, channel->key); |
3bd1e081 MD |
887 | |
888 | switch (consumer_data.type) { | |
889 | case LTTNG_CONSUMER_KERNEL: | |
890 | channel->mmap_base = NULL; | |
891 | channel->mmap_len = 0; | |
892 | break; | |
7753dea8 MD |
893 | case LTTNG_CONSUMER32_UST: |
894 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
895 | ret = lttng_ustconsumer_allocate_channel(channel); |
896 | if (ret) { | |
897 | free(channel); | |
898 | return NULL; | |
899 | } | |
900 | break; | |
901 | default: | |
902 | ERR("Unknown consumer_data type"); | |
903 | assert(0); | |
904 | goto end; | |
905 | } | |
906 | DBG("Allocated channel (key %d, shm_fd %d, wait_fd %d, mmap_len %llu, max_sb_size %llu)", | |
00e2e675 | 907 | channel->key, channel->shm_fd, channel->wait_fd, |
3bd1e081 MD |
908 | (unsigned long long) channel->mmap_len, |
909 | (unsigned long long) channel->max_sb_size); | |
910 | end: | |
911 | return channel; | |
912 | } | |
913 | ||
914 | /* | |
915 | * Add a channel to the global list protected by a mutex. | |
916 | */ | |
917 | int consumer_add_channel(struct lttng_consumer_channel *channel) | |
918 | { | |
c77fc10a DG |
919 | struct lttng_ht_node_ulong *node; |
920 | struct lttng_ht_iter iter; | |
921 | ||
3bd1e081 | 922 | pthread_mutex_lock(&consumer_data.lock); |
7ad0a0cb MD |
923 | /* Steal channel identifier, for UST */ |
924 | consumer_steal_channel_key(channel->key); | |
6065ceec | 925 | rcu_read_lock(); |
c77fc10a DG |
926 | |
927 | lttng_ht_lookup(consumer_data.channel_ht, | |
928 | (void *)((unsigned long) channel->key), &iter); | |
929 | node = lttng_ht_iter_get_node_ulong(&iter); | |
930 | if (node != NULL) { | |
931 | /* Channel already exist. Ignore the insertion */ | |
932 | goto end; | |
933 | } | |
934 | ||
04253271 | 935 | lttng_ht_add_unique_ulong(consumer_data.channel_ht, &channel->node); |
c77fc10a DG |
936 | |
937 | end: | |
6065ceec | 938 | rcu_read_unlock(); |
3bd1e081 | 939 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 940 | |
7ad0a0cb | 941 | return 0; |
3bd1e081 MD |
942 | } |
943 | ||
944 | /* | |
945 | * Allocate the pollfd structure and the local view of the out fds to avoid | |
946 | * doing a lookup in the linked list and concurrency issues when writing is | |
947 | * needed. Called with consumer_data.lock held. | |
948 | * | |
949 | * Returns the number of fds in the structures. | |
950 | */ | |
43c34bc3 | 951 | static int consumer_update_poll_array( |
3bd1e081 | 952 | struct lttng_consumer_local_data *ctx, struct pollfd **pollfd, |
43c34bc3 | 953 | struct lttng_consumer_stream **local_stream, struct lttng_ht *ht) |
3bd1e081 | 954 | { |
3bd1e081 | 955 | int i = 0; |
e4421fec DG |
956 | struct lttng_ht_iter iter; |
957 | struct lttng_consumer_stream *stream; | |
3bd1e081 MD |
958 | |
959 | DBG("Updating poll fd array"); | |
481d6c57 | 960 | rcu_read_lock(); |
43c34bc3 | 961 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { |
8994307f DG |
962 | /* |
963 | * Only active streams with an active end point can be added to the | |
964 | * poll set and local stream storage of the thread. | |
965 | * | |
966 | * There is a potential race here for endpoint_status to be updated | |
967 | * just after the check. However, this is OK since the stream(s) will | |
968 | * be deleted once the thread is notified that the end point state has | |
969 | * changed where this function will be called back again. | |
970 | */ | |
971 | if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM || | |
79d4ffb7 | 972 | stream->endpoint_status == CONSUMER_ENDPOINT_INACTIVE) { |
3bd1e081 MD |
973 | continue; |
974 | } | |
e4421fec DG |
975 | DBG("Active FD %d", stream->wait_fd); |
976 | (*pollfd)[i].fd = stream->wait_fd; | |
3bd1e081 | 977 | (*pollfd)[i].events = POLLIN | POLLPRI; |
e4421fec | 978 | local_stream[i] = stream; |
3bd1e081 MD |
979 | i++; |
980 | } | |
481d6c57 | 981 | rcu_read_unlock(); |
3bd1e081 MD |
982 | |
983 | /* | |
50f8ae69 | 984 | * Insert the consumer_data_pipe at the end of the array and don't |
3bd1e081 MD |
985 | * increment i so nb_fd is the number of real FD. |
986 | */ | |
50f8ae69 | 987 | (*pollfd)[i].fd = ctx->consumer_data_pipe[0]; |
509bb1cf | 988 | (*pollfd)[i].events = POLLIN | POLLPRI; |
3bd1e081 MD |
989 | return i; |
990 | } | |
991 | ||
992 | /* | |
993 | * Poll on the should_quit pipe and the command socket return -1 on error and | |
994 | * should exit, 0 if data is available on the command socket | |
995 | */ | |
996 | int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll) | |
997 | { | |
998 | int num_rdy; | |
999 | ||
88f2b785 | 1000 | restart: |
3bd1e081 MD |
1001 | num_rdy = poll(consumer_sockpoll, 2, -1); |
1002 | if (num_rdy == -1) { | |
88f2b785 MD |
1003 | /* |
1004 | * Restart interrupted system call. | |
1005 | */ | |
1006 | if (errno == EINTR) { | |
1007 | goto restart; | |
1008 | } | |
7a57cf92 | 1009 | PERROR("Poll error"); |
3bd1e081 MD |
1010 | goto exit; |
1011 | } | |
509bb1cf | 1012 | if (consumer_sockpoll[0].revents & (POLLIN | POLLPRI)) { |
3bd1e081 MD |
1013 | DBG("consumer_should_quit wake up"); |
1014 | goto exit; | |
1015 | } | |
1016 | return 0; | |
1017 | ||
1018 | exit: | |
1019 | return -1; | |
1020 | } | |
1021 | ||
1022 | /* | |
1023 | * Set the error socket. | |
1024 | */ | |
1025 | void lttng_consumer_set_error_sock( | |
1026 | struct lttng_consumer_local_data *ctx, int sock) | |
1027 | { | |
1028 | ctx->consumer_error_socket = sock; | |
1029 | } | |
1030 | ||
1031 | /* | |
1032 | * Set the command socket path. | |
1033 | */ | |
3bd1e081 MD |
1034 | void lttng_consumer_set_command_sock_path( |
1035 | struct lttng_consumer_local_data *ctx, char *sock) | |
1036 | { | |
1037 | ctx->consumer_command_sock_path = sock; | |
1038 | } | |
1039 | ||
1040 | /* | |
1041 | * Send return code to the session daemon. | |
1042 | * If the socket is not defined, we return 0, it is not a fatal error | |
1043 | */ | |
1044 | int lttng_consumer_send_error( | |
1045 | struct lttng_consumer_local_data *ctx, int cmd) | |
1046 | { | |
1047 | if (ctx->consumer_error_socket > 0) { | |
1048 | return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd, | |
1049 | sizeof(enum lttcomm_sessiond_command)); | |
1050 | } | |
1051 | ||
1052 | return 0; | |
1053 | } | |
1054 | ||
1055 | /* | |
228b5bf7 DG |
1056 | * Close all the tracefiles and stream fds and MUST be called when all |
1057 | * instances are destroyed i.e. when all threads were joined and are ended. | |
3bd1e081 MD |
1058 | */ |
1059 | void lttng_consumer_cleanup(void) | |
1060 | { | |
e4421fec | 1061 | struct lttng_ht_iter iter; |
6065ceec DG |
1062 | struct lttng_ht_node_ulong *node; |
1063 | ||
1064 | rcu_read_lock(); | |
3bd1e081 | 1065 | |
6065ceec DG |
1066 | cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, node, |
1067 | node) { | |
702b1ea4 MD |
1068 | struct lttng_consumer_channel *channel = |
1069 | caa_container_of(node, struct lttng_consumer_channel, node); | |
1070 | consumer_del_channel(channel); | |
3bd1e081 | 1071 | } |
6065ceec DG |
1072 | |
1073 | rcu_read_unlock(); | |
d6ce1df2 | 1074 | |
d6ce1df2 | 1075 | lttng_ht_destroy(consumer_data.channel_ht); |
228b5bf7 DG |
1076 | |
1077 | cleanup_relayd_ht(); | |
1078 | ||
1079 | /* | |
1080 | * This HT contains streams that are freed by either the metadata thread or | |
1081 | * the data thread so we do *nothing* on the hash table and simply destroy | |
1082 | * it. | |
1083 | */ | |
1084 | lttng_ht_destroy(consumer_data.stream_list_ht); | |
3bd1e081 MD |
1085 | } |
1086 | ||
1087 | /* | |
1088 | * Called from signal handler. | |
1089 | */ | |
1090 | void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx) | |
1091 | { | |
1092 | int ret; | |
1093 | consumer_quit = 1; | |
6f94560a MD |
1094 | do { |
1095 | ret = write(ctx->consumer_should_quit[1], "4", 1); | |
1096 | } while (ret < 0 && errno == EINTR); | |
3bd1e081 | 1097 | if (ret < 0) { |
7a57cf92 | 1098 | PERROR("write consumer quit"); |
3bd1e081 | 1099 | } |
ab1027f4 DG |
1100 | |
1101 | DBG("Consumer flag that it should quit"); | |
3bd1e081 MD |
1102 | } |
1103 | ||
00e2e675 DG |
1104 | void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream, |
1105 | off_t orig_offset) | |
3bd1e081 MD |
1106 | { |
1107 | int outfd = stream->out_fd; | |
1108 | ||
1109 | /* | |
1110 | * This does a blocking write-and-wait on any page that belongs to the | |
1111 | * subbuffer prior to the one we just wrote. | |
1112 | * Don't care about error values, as these are just hints and ways to | |
1113 | * limit the amount of page cache used. | |
1114 | */ | |
1115 | if (orig_offset < stream->chan->max_sb_size) { | |
1116 | return; | |
1117 | } | |
b9182dd9 | 1118 | lttng_sync_file_range(outfd, orig_offset - stream->chan->max_sb_size, |
3bd1e081 MD |
1119 | stream->chan->max_sb_size, |
1120 | SYNC_FILE_RANGE_WAIT_BEFORE | |
1121 | | SYNC_FILE_RANGE_WRITE | |
1122 | | SYNC_FILE_RANGE_WAIT_AFTER); | |
1123 | /* | |
1124 | * Give hints to the kernel about how we access the file: | |
1125 | * POSIX_FADV_DONTNEED : we won't re-access data in a near future after | |
1126 | * we write it. | |
1127 | * | |
1128 | * We need to call fadvise again after the file grows because the | |
1129 | * kernel does not seem to apply fadvise to non-existing parts of the | |
1130 | * file. | |
1131 | * | |
1132 | * Call fadvise _after_ having waited for the page writeback to | |
1133 | * complete because the dirty page writeback semantic is not well | |
1134 | * defined. So it can be expected to lead to lower throughput in | |
1135 | * streaming. | |
1136 | */ | |
1137 | posix_fadvise(outfd, orig_offset - stream->chan->max_sb_size, | |
1138 | stream->chan->max_sb_size, POSIX_FADV_DONTNEED); | |
1139 | } | |
1140 | ||
1141 | /* | |
1142 | * Initialise the necessary environnement : | |
1143 | * - create a new context | |
1144 | * - create the poll_pipe | |
1145 | * - create the should_quit pipe (for signal handler) | |
1146 | * - create the thread pipe (for splice) | |
1147 | * | |
1148 | * Takes a function pointer as argument, this function is called when data is | |
1149 | * available on a buffer. This function is responsible to do the | |
1150 | * kernctl_get_next_subbuf, read the data with mmap or splice depending on the | |
1151 | * buffer configuration and then kernctl_put_next_subbuf at the end. | |
1152 | * | |
1153 | * Returns a pointer to the new context or NULL on error. | |
1154 | */ | |
1155 | struct lttng_consumer_local_data *lttng_consumer_create( | |
1156 | enum lttng_consumer_type type, | |
4078b776 | 1157 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
d41f73b7 | 1158 | struct lttng_consumer_local_data *ctx), |
3bd1e081 MD |
1159 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
1160 | int (*recv_stream)(struct lttng_consumer_stream *stream), | |
1161 | int (*update_stream)(int stream_key, uint32_t state)) | |
1162 | { | |
1163 | int ret, i; | |
1164 | struct lttng_consumer_local_data *ctx; | |
1165 | ||
1166 | assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN || | |
1167 | consumer_data.type == type); | |
1168 | consumer_data.type = type; | |
1169 | ||
effcf122 | 1170 | ctx = zmalloc(sizeof(struct lttng_consumer_local_data)); |
3bd1e081 | 1171 | if (ctx == NULL) { |
7a57cf92 | 1172 | PERROR("allocating context"); |
3bd1e081 MD |
1173 | goto error; |
1174 | } | |
1175 | ||
1176 | ctx->consumer_error_socket = -1; | |
1177 | /* assign the callbacks */ | |
1178 | ctx->on_buffer_ready = buffer_ready; | |
1179 | ctx->on_recv_channel = recv_channel; | |
1180 | ctx->on_recv_stream = recv_stream; | |
1181 | ctx->on_update_stream = update_stream; | |
1182 | ||
50f8ae69 | 1183 | ret = pipe(ctx->consumer_data_pipe); |
3bd1e081 | 1184 | if (ret < 0) { |
7a57cf92 | 1185 | PERROR("Error creating poll pipe"); |
3bd1e081 MD |
1186 | goto error_poll_pipe; |
1187 | } | |
1188 | ||
04fdd819 | 1189 | /* set read end of the pipe to non-blocking */ |
50f8ae69 | 1190 | ret = fcntl(ctx->consumer_data_pipe[0], F_SETFL, O_NONBLOCK); |
04fdd819 | 1191 | if (ret < 0) { |
7a57cf92 | 1192 | PERROR("fcntl O_NONBLOCK"); |
04fdd819 MD |
1193 | goto error_poll_fcntl; |
1194 | } | |
1195 | ||
1196 | /* set write end of the pipe to non-blocking */ | |
50f8ae69 | 1197 | ret = fcntl(ctx->consumer_data_pipe[1], F_SETFL, O_NONBLOCK); |
04fdd819 | 1198 | if (ret < 0) { |
7a57cf92 | 1199 | PERROR("fcntl O_NONBLOCK"); |
04fdd819 MD |
1200 | goto error_poll_fcntl; |
1201 | } | |
1202 | ||
3bd1e081 MD |
1203 | ret = pipe(ctx->consumer_should_quit); |
1204 | if (ret < 0) { | |
7a57cf92 | 1205 | PERROR("Error creating recv pipe"); |
3bd1e081 MD |
1206 | goto error_quit_pipe; |
1207 | } | |
1208 | ||
1209 | ret = pipe(ctx->consumer_thread_pipe); | |
1210 | if (ret < 0) { | |
7a57cf92 | 1211 | PERROR("Error creating thread pipe"); |
3bd1e081 MD |
1212 | goto error_thread_pipe; |
1213 | } | |
1214 | ||
fb3a43a9 DG |
1215 | ret = utils_create_pipe(ctx->consumer_metadata_pipe); |
1216 | if (ret < 0) { | |
1217 | goto error_metadata_pipe; | |
1218 | } | |
3bd1e081 | 1219 | |
fb3a43a9 DG |
1220 | ret = utils_create_pipe(ctx->consumer_splice_metadata_pipe); |
1221 | if (ret < 0) { | |
1222 | goto error_splice_pipe; | |
1223 | } | |
1224 | ||
1225 | return ctx; | |
3bd1e081 | 1226 | |
fb3a43a9 DG |
1227 | error_splice_pipe: |
1228 | utils_close_pipe(ctx->consumer_metadata_pipe); | |
1229 | error_metadata_pipe: | |
1230 | utils_close_pipe(ctx->consumer_thread_pipe); | |
3bd1e081 MD |
1231 | error_thread_pipe: |
1232 | for (i = 0; i < 2; i++) { | |
1233 | int err; | |
1234 | ||
1235 | err = close(ctx->consumer_should_quit[i]); | |
4c462e79 MD |
1236 | if (err) { |
1237 | PERROR("close"); | |
1238 | } | |
3bd1e081 | 1239 | } |
04fdd819 | 1240 | error_poll_fcntl: |
3bd1e081 MD |
1241 | error_quit_pipe: |
1242 | for (i = 0; i < 2; i++) { | |
1243 | int err; | |
1244 | ||
50f8ae69 | 1245 | err = close(ctx->consumer_data_pipe[i]); |
4c462e79 MD |
1246 | if (err) { |
1247 | PERROR("close"); | |
1248 | } | |
3bd1e081 MD |
1249 | } |
1250 | error_poll_pipe: | |
1251 | free(ctx); | |
1252 | error: | |
1253 | return NULL; | |
1254 | } | |
1255 | ||
1256 | /* | |
1257 | * Close all fds associated with the instance and free the context. | |
1258 | */ | |
1259 | void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx) | |
1260 | { | |
4c462e79 MD |
1261 | int ret; |
1262 | ||
ab1027f4 DG |
1263 | DBG("Consumer destroying it. Closing everything."); |
1264 | ||
4c462e79 MD |
1265 | ret = close(ctx->consumer_error_socket); |
1266 | if (ret) { | |
1267 | PERROR("close"); | |
1268 | } | |
1269 | ret = close(ctx->consumer_thread_pipe[0]); | |
1270 | if (ret) { | |
1271 | PERROR("close"); | |
1272 | } | |
1273 | ret = close(ctx->consumer_thread_pipe[1]); | |
1274 | if (ret) { | |
1275 | PERROR("close"); | |
1276 | } | |
50f8ae69 | 1277 | ret = close(ctx->consumer_data_pipe[0]); |
4c462e79 MD |
1278 | if (ret) { |
1279 | PERROR("close"); | |
1280 | } | |
50f8ae69 | 1281 | ret = close(ctx->consumer_data_pipe[1]); |
4c462e79 MD |
1282 | if (ret) { |
1283 | PERROR("close"); | |
1284 | } | |
1285 | ret = close(ctx->consumer_should_quit[0]); | |
1286 | if (ret) { | |
1287 | PERROR("close"); | |
1288 | } | |
1289 | ret = close(ctx->consumer_should_quit[1]); | |
1290 | if (ret) { | |
1291 | PERROR("close"); | |
1292 | } | |
fb3a43a9 DG |
1293 | utils_close_pipe(ctx->consumer_splice_metadata_pipe); |
1294 | ||
3bd1e081 MD |
1295 | unlink(ctx->consumer_command_sock_path); |
1296 | free(ctx); | |
1297 | } | |
1298 | ||
6197aea7 DG |
1299 | /* |
1300 | * Write the metadata stream id on the specified file descriptor. | |
1301 | */ | |
1302 | static int write_relayd_metadata_id(int fd, | |
1303 | struct lttng_consumer_stream *stream, | |
1d4dfdef DG |
1304 | struct consumer_relayd_sock_pair *relayd, |
1305 | unsigned long padding) | |
6197aea7 DG |
1306 | { |
1307 | int ret; | |
1d4dfdef | 1308 | struct lttcomm_relayd_metadata_payload hdr; |
6197aea7 | 1309 | |
1d4dfdef DG |
1310 | hdr.stream_id = htobe64(stream->relayd_stream_id); |
1311 | hdr.padding_size = htobe32(padding); | |
6197aea7 | 1312 | do { |
1d4dfdef | 1313 | ret = write(fd, (void *) &hdr, sizeof(hdr)); |
6197aea7 DG |
1314 | } while (ret < 0 && errno == EINTR); |
1315 | if (ret < 0) { | |
1316 | PERROR("write metadata stream id"); | |
1317 | goto end; | |
1318 | } | |
1d4dfdef DG |
1319 | DBG("Metadata stream id %" PRIu64 " with padding %lu written before data", |
1320 | stream->relayd_stream_id, padding); | |
6197aea7 DG |
1321 | |
1322 | end: | |
1323 | return ret; | |
1324 | } | |
1325 | ||
3bd1e081 | 1326 | /* |
09e26845 DG |
1327 | * Mmap the ring buffer, read it and write the data to the tracefile. This is a |
1328 | * core function for writing trace buffers to either the local filesystem or | |
1329 | * the network. | |
1330 | * | |
79d4ffb7 DG |
1331 | * It must be called with the stream lock held. |
1332 | * | |
09e26845 | 1333 | * Careful review MUST be put if any changes occur! |
3bd1e081 MD |
1334 | * |
1335 | * Returns the number of bytes written | |
1336 | */ | |
4078b776 | 1337 | ssize_t lttng_consumer_on_read_subbuffer_mmap( |
3bd1e081 | 1338 | struct lttng_consumer_local_data *ctx, |
1d4dfdef DG |
1339 | struct lttng_consumer_stream *stream, unsigned long len, |
1340 | unsigned long padding) | |
3bd1e081 | 1341 | { |
f02e1e8a DG |
1342 | unsigned long mmap_offset; |
1343 | ssize_t ret = 0, written = 0; | |
1344 | off_t orig_offset = stream->out_fd_offset; | |
1345 | /* Default is on the disk */ | |
1346 | int outfd = stream->out_fd; | |
f02e1e8a | 1347 | struct consumer_relayd_sock_pair *relayd = NULL; |
8994307f | 1348 | unsigned int relayd_hang_up = 0; |
f02e1e8a DG |
1349 | |
1350 | /* RCU lock for the relayd pointer */ | |
1351 | rcu_read_lock(); | |
1352 | ||
1353 | /* Flag that the current stream if set for network streaming. */ | |
1354 | if (stream->net_seq_idx != -1) { | |
1355 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1356 | if (relayd == NULL) { | |
1357 | goto end; | |
1358 | } | |
1359 | } | |
1360 | ||
1361 | /* get the offset inside the fd to mmap */ | |
3bd1e081 MD |
1362 | switch (consumer_data.type) { |
1363 | case LTTNG_CONSUMER_KERNEL: | |
f02e1e8a DG |
1364 | ret = kernctl_get_mmap_read_offset(stream->wait_fd, &mmap_offset); |
1365 | break; | |
7753dea8 MD |
1366 | case LTTNG_CONSUMER32_UST: |
1367 | case LTTNG_CONSUMER64_UST: | |
f02e1e8a DG |
1368 | ret = lttng_ustctl_get_mmap_read_offset(stream->chan->handle, |
1369 | stream->buf, &mmap_offset); | |
1370 | break; | |
3bd1e081 MD |
1371 | default: |
1372 | ERR("Unknown consumer_data type"); | |
1373 | assert(0); | |
1374 | } | |
f02e1e8a DG |
1375 | if (ret != 0) { |
1376 | errno = -ret; | |
1377 | PERROR("tracer ctl get_mmap_read_offset"); | |
1378 | written = ret; | |
1379 | goto end; | |
1380 | } | |
b9182dd9 | 1381 | |
f02e1e8a DG |
1382 | /* Handle stream on the relayd if the output is on the network */ |
1383 | if (relayd) { | |
1384 | unsigned long netlen = len; | |
1385 | ||
1386 | /* | |
1387 | * Lock the control socket for the complete duration of the function | |
1388 | * since from this point on we will use the socket. | |
1389 | */ | |
1390 | if (stream->metadata_flag) { | |
1391 | /* Metadata requires the control socket. */ | |
1392 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1d4dfdef | 1393 | netlen += sizeof(struct lttcomm_relayd_metadata_payload); |
f02e1e8a DG |
1394 | } |
1395 | ||
1d4dfdef | 1396 | ret = write_relayd_stream_header(stream, netlen, padding, relayd); |
f02e1e8a DG |
1397 | if (ret >= 0) { |
1398 | /* Use the returned socket. */ | |
1399 | outfd = ret; | |
1400 | ||
1401 | /* Write metadata stream id before payload */ | |
1402 | if (stream->metadata_flag) { | |
1d4dfdef | 1403 | ret = write_relayd_metadata_id(outfd, stream, relayd, padding); |
f02e1e8a | 1404 | if (ret < 0) { |
f02e1e8a | 1405 | written = ret; |
8994307f DG |
1406 | /* Socket operation failed. We consider the relayd dead */ |
1407 | if (ret == -EPIPE || ret == -EINVAL) { | |
1408 | relayd_hang_up = 1; | |
1409 | goto write_error; | |
1410 | } | |
f02e1e8a DG |
1411 | goto end; |
1412 | } | |
f02e1e8a | 1413 | } |
8994307f DG |
1414 | } else { |
1415 | /* Socket operation failed. We consider the relayd dead */ | |
1416 | if (ret == -EPIPE || ret == -EINVAL) { | |
1417 | relayd_hang_up = 1; | |
1418 | goto write_error; | |
1419 | } | |
1420 | /* Else, use the default set before which is the filesystem. */ | |
f02e1e8a | 1421 | } |
1d4dfdef DG |
1422 | } else { |
1423 | /* No streaming, we have to set the len with the full padding */ | |
1424 | len += padding; | |
f02e1e8a DG |
1425 | } |
1426 | ||
1427 | while (len > 0) { | |
1428 | do { | |
1429 | ret = write(outfd, stream->mmap_base + mmap_offset, len); | |
1430 | } while (ret < 0 && errno == EINTR); | |
1d4dfdef | 1431 | DBG("Consumer mmap write() ret %zd (len %lu)", ret, len); |
f02e1e8a DG |
1432 | if (ret < 0) { |
1433 | PERROR("Error in file write"); | |
1434 | if (written == 0) { | |
1435 | written = ret; | |
1436 | } | |
8994307f DG |
1437 | /* Socket operation failed. We consider the relayd dead */ |
1438 | if (errno == EPIPE || errno == EINVAL) { | |
1439 | relayd_hang_up = 1; | |
1440 | goto write_error; | |
1441 | } | |
f02e1e8a DG |
1442 | goto end; |
1443 | } else if (ret > len) { | |
77c7c900 | 1444 | PERROR("Error in file write (ret %zd > len %lu)", ret, len); |
f02e1e8a DG |
1445 | written += ret; |
1446 | goto end; | |
1447 | } else { | |
1448 | len -= ret; | |
1449 | mmap_offset += ret; | |
1450 | } | |
f02e1e8a DG |
1451 | |
1452 | /* This call is useless on a socket so better save a syscall. */ | |
1453 | if (!relayd) { | |
1454 | /* This won't block, but will start writeout asynchronously */ | |
1455 | lttng_sync_file_range(outfd, stream->out_fd_offset, ret, | |
1456 | SYNC_FILE_RANGE_WRITE); | |
1457 | stream->out_fd_offset += ret; | |
1458 | } | |
1459 | written += ret; | |
1460 | } | |
1461 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
1462 | ||
8994307f DG |
1463 | write_error: |
1464 | /* | |
1465 | * This is a special case that the relayd has closed its socket. Let's | |
1466 | * cleanup the relayd object and all associated streams. | |
1467 | */ | |
1468 | if (relayd && relayd_hang_up) { | |
1469 | cleanup_relayd(relayd, ctx); | |
1470 | } | |
1471 | ||
f02e1e8a DG |
1472 | end: |
1473 | /* Unlock only if ctrl socket used */ | |
1474 | if (relayd && stream->metadata_flag) { | |
1475 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1476 | } | |
1477 | ||
1478 | rcu_read_unlock(); | |
1479 | return written; | |
3bd1e081 MD |
1480 | } |
1481 | ||
1482 | /* | |
1483 | * Splice the data from the ring buffer to the tracefile. | |
1484 | * | |
79d4ffb7 DG |
1485 | * It must be called with the stream lock held. |
1486 | * | |
3bd1e081 MD |
1487 | * Returns the number of bytes spliced. |
1488 | */ | |
4078b776 | 1489 | ssize_t lttng_consumer_on_read_subbuffer_splice( |
3bd1e081 | 1490 | struct lttng_consumer_local_data *ctx, |
1d4dfdef DG |
1491 | struct lttng_consumer_stream *stream, unsigned long len, |
1492 | unsigned long padding) | |
3bd1e081 | 1493 | { |
f02e1e8a DG |
1494 | ssize_t ret = 0, written = 0, ret_splice = 0; |
1495 | loff_t offset = 0; | |
1496 | off_t orig_offset = stream->out_fd_offset; | |
1497 | int fd = stream->wait_fd; | |
1498 | /* Default is on the disk */ | |
1499 | int outfd = stream->out_fd; | |
f02e1e8a | 1500 | struct consumer_relayd_sock_pair *relayd = NULL; |
fb3a43a9 | 1501 | int *splice_pipe; |
8994307f | 1502 | unsigned int relayd_hang_up = 0; |
f02e1e8a | 1503 | |
3bd1e081 MD |
1504 | switch (consumer_data.type) { |
1505 | case LTTNG_CONSUMER_KERNEL: | |
f02e1e8a | 1506 | break; |
7753dea8 MD |
1507 | case LTTNG_CONSUMER32_UST: |
1508 | case LTTNG_CONSUMER64_UST: | |
f02e1e8a | 1509 | /* Not supported for user space tracing */ |
3bd1e081 MD |
1510 | return -ENOSYS; |
1511 | default: | |
1512 | ERR("Unknown consumer_data type"); | |
1513 | assert(0); | |
3bd1e081 MD |
1514 | } |
1515 | ||
f02e1e8a DG |
1516 | /* RCU lock for the relayd pointer */ |
1517 | rcu_read_lock(); | |
1518 | ||
1519 | /* Flag that the current stream if set for network streaming. */ | |
1520 | if (stream->net_seq_idx != -1) { | |
1521 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1522 | if (relayd == NULL) { | |
1523 | goto end; | |
1524 | } | |
1525 | } | |
1526 | ||
fb3a43a9 DG |
1527 | /* |
1528 | * Choose right pipe for splice. Metadata and trace data are handled by | |
1529 | * different threads hence the use of two pipes in order not to race or | |
1530 | * corrupt the written data. | |
1531 | */ | |
1532 | if (stream->metadata_flag) { | |
1533 | splice_pipe = ctx->consumer_splice_metadata_pipe; | |
1534 | } else { | |
1535 | splice_pipe = ctx->consumer_thread_pipe; | |
1536 | } | |
1537 | ||
f02e1e8a | 1538 | /* Write metadata stream id before payload */ |
1d4dfdef DG |
1539 | if (relayd) { |
1540 | int total_len = len; | |
f02e1e8a | 1541 | |
1d4dfdef DG |
1542 | if (stream->metadata_flag) { |
1543 | /* | |
1544 | * Lock the control socket for the complete duration of the function | |
1545 | * since from this point on we will use the socket. | |
1546 | */ | |
1547 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1548 | ||
1549 | ret = write_relayd_metadata_id(splice_pipe[1], stream, relayd, | |
1550 | padding); | |
1551 | if (ret < 0) { | |
1552 | written = ret; | |
8994307f DG |
1553 | /* Socket operation failed. We consider the relayd dead */ |
1554 | if (ret == -EBADF) { | |
1555 | WARN("Remote relayd disconnected. Stopping"); | |
1556 | relayd_hang_up = 1; | |
1557 | goto write_error; | |
1558 | } | |
1d4dfdef DG |
1559 | goto end; |
1560 | } | |
1561 | ||
1562 | total_len += sizeof(struct lttcomm_relayd_metadata_payload); | |
1563 | } | |
1564 | ||
1565 | ret = write_relayd_stream_header(stream, total_len, padding, relayd); | |
1566 | if (ret >= 0) { | |
1567 | /* Use the returned socket. */ | |
1568 | outfd = ret; | |
1569 | } else { | |
8994307f DG |
1570 | /* Socket operation failed. We consider the relayd dead */ |
1571 | if (ret == -EBADF) { | |
1572 | WARN("Remote relayd disconnected. Stopping"); | |
1573 | relayd_hang_up = 1; | |
1574 | goto write_error; | |
1575 | } | |
f02e1e8a DG |
1576 | goto end; |
1577 | } | |
1d4dfdef DG |
1578 | } else { |
1579 | /* No streaming, we have to set the len with the full padding */ | |
1580 | len += padding; | |
f02e1e8a DG |
1581 | } |
1582 | ||
1583 | while (len > 0) { | |
1d4dfdef DG |
1584 | DBG("splice chan to pipe offset %lu of len %lu (fd : %d, pipe: %d)", |
1585 | (unsigned long)offset, len, fd, splice_pipe[1]); | |
fb3a43a9 | 1586 | ret_splice = splice(fd, &offset, splice_pipe[1], NULL, len, |
f02e1e8a DG |
1587 | SPLICE_F_MOVE | SPLICE_F_MORE); |
1588 | DBG("splice chan to pipe, ret %zd", ret_splice); | |
1589 | if (ret_splice < 0) { | |
1590 | PERROR("Error in relay splice"); | |
1591 | if (written == 0) { | |
1592 | written = ret_splice; | |
1593 | } | |
1594 | ret = errno; | |
1595 | goto splice_error; | |
1596 | } | |
1597 | ||
1598 | /* Handle stream on the relayd if the output is on the network */ | |
1599 | if (relayd) { | |
1600 | if (stream->metadata_flag) { | |
1d4dfdef DG |
1601 | size_t metadata_payload_size = |
1602 | sizeof(struct lttcomm_relayd_metadata_payload); | |
1603 | ||
f02e1e8a | 1604 | /* Update counter to fit the spliced data */ |
1d4dfdef DG |
1605 | ret_splice += metadata_payload_size; |
1606 | len += metadata_payload_size; | |
f02e1e8a DG |
1607 | /* |
1608 | * We do this so the return value can match the len passed as | |
1609 | * argument to this function. | |
1610 | */ | |
1d4dfdef | 1611 | written -= metadata_payload_size; |
f02e1e8a DG |
1612 | } |
1613 | } | |
1614 | ||
1615 | /* Splice data out */ | |
fb3a43a9 | 1616 | ret_splice = splice(splice_pipe[0], NULL, outfd, NULL, |
f02e1e8a | 1617 | ret_splice, SPLICE_F_MOVE | SPLICE_F_MORE); |
1d4dfdef | 1618 | DBG("Consumer splice pipe to file, ret %zd", ret_splice); |
f02e1e8a DG |
1619 | if (ret_splice < 0) { |
1620 | PERROR("Error in file splice"); | |
1621 | if (written == 0) { | |
1622 | written = ret_splice; | |
1623 | } | |
8994307f | 1624 | /* Socket operation failed. We consider the relayd dead */ |
00c8752b | 1625 | if (errno == EBADF || errno == EPIPE) { |
8994307f DG |
1626 | WARN("Remote relayd disconnected. Stopping"); |
1627 | relayd_hang_up = 1; | |
1628 | goto write_error; | |
1629 | } | |
f02e1e8a DG |
1630 | ret = errno; |
1631 | goto splice_error; | |
1632 | } else if (ret_splice > len) { | |
1633 | errno = EINVAL; | |
1634 | PERROR("Wrote more data than requested %zd (len: %lu)", | |
1635 | ret_splice, len); | |
1636 | written += ret_splice; | |
1637 | ret = errno; | |
1638 | goto splice_error; | |
1639 | } | |
1640 | len -= ret_splice; | |
1641 | ||
1642 | /* This call is useless on a socket so better save a syscall. */ | |
1643 | if (!relayd) { | |
1644 | /* This won't block, but will start writeout asynchronously */ | |
1645 | lttng_sync_file_range(outfd, stream->out_fd_offset, ret_splice, | |
1646 | SYNC_FILE_RANGE_WRITE); | |
1647 | stream->out_fd_offset += ret_splice; | |
1648 | } | |
1649 | written += ret_splice; | |
1650 | } | |
1651 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
1652 | ||
1653 | ret = ret_splice; | |
1654 | ||
1655 | goto end; | |
1656 | ||
8994307f DG |
1657 | write_error: |
1658 | /* | |
1659 | * This is a special case that the relayd has closed its socket. Let's | |
1660 | * cleanup the relayd object and all associated streams. | |
1661 | */ | |
1662 | if (relayd && relayd_hang_up) { | |
1663 | cleanup_relayd(relayd, ctx); | |
1664 | /* Skip splice error so the consumer does not fail */ | |
1665 | goto end; | |
1666 | } | |
1667 | ||
f02e1e8a DG |
1668 | splice_error: |
1669 | /* send the appropriate error description to sessiond */ | |
1670 | switch (ret) { | |
f02e1e8a | 1671 | case EINVAL: |
f73fabfd | 1672 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_EINVAL); |
f02e1e8a DG |
1673 | break; |
1674 | case ENOMEM: | |
f73fabfd | 1675 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ENOMEM); |
f02e1e8a DG |
1676 | break; |
1677 | case ESPIPE: | |
f73fabfd | 1678 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ESPIPE); |
f02e1e8a DG |
1679 | break; |
1680 | } | |
1681 | ||
1682 | end: | |
1683 | if (relayd && stream->metadata_flag) { | |
1684 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1685 | } | |
1686 | ||
1687 | rcu_read_unlock(); | |
1688 | return written; | |
3bd1e081 MD |
1689 | } |
1690 | ||
1691 | /* | |
1692 | * Take a snapshot for a specific fd | |
1693 | * | |
1694 | * Returns 0 on success, < 0 on error | |
1695 | */ | |
1696 | int lttng_consumer_take_snapshot(struct lttng_consumer_local_data *ctx, | |
1697 | struct lttng_consumer_stream *stream) | |
1698 | { | |
1699 | switch (consumer_data.type) { | |
1700 | case LTTNG_CONSUMER_KERNEL: | |
1701 | return lttng_kconsumer_take_snapshot(ctx, stream); | |
7753dea8 MD |
1702 | case LTTNG_CONSUMER32_UST: |
1703 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1704 | return lttng_ustconsumer_take_snapshot(ctx, stream); |
1705 | default: | |
1706 | ERR("Unknown consumer_data type"); | |
1707 | assert(0); | |
1708 | return -ENOSYS; | |
1709 | } | |
1710 | ||
1711 | } | |
1712 | ||
1713 | /* | |
1714 | * Get the produced position | |
1715 | * | |
1716 | * Returns 0 on success, < 0 on error | |
1717 | */ | |
1718 | int lttng_consumer_get_produced_snapshot( | |
1719 | struct lttng_consumer_local_data *ctx, | |
1720 | struct lttng_consumer_stream *stream, | |
1721 | unsigned long *pos) | |
1722 | { | |
1723 | switch (consumer_data.type) { | |
1724 | case LTTNG_CONSUMER_KERNEL: | |
1725 | return lttng_kconsumer_get_produced_snapshot(ctx, stream, pos); | |
7753dea8 MD |
1726 | case LTTNG_CONSUMER32_UST: |
1727 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1728 | return lttng_ustconsumer_get_produced_snapshot(ctx, stream, pos); |
1729 | default: | |
1730 | ERR("Unknown consumer_data type"); | |
1731 | assert(0); | |
1732 | return -ENOSYS; | |
1733 | } | |
1734 | } | |
1735 | ||
1736 | int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, | |
1737 | int sock, struct pollfd *consumer_sockpoll) | |
1738 | { | |
1739 | switch (consumer_data.type) { | |
1740 | case LTTNG_CONSUMER_KERNEL: | |
1741 | return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
7753dea8 MD |
1742 | case LTTNG_CONSUMER32_UST: |
1743 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1744 | return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll); |
1745 | default: | |
1746 | ERR("Unknown consumer_data type"); | |
1747 | assert(0); | |
1748 | return -ENOSYS; | |
1749 | } | |
1750 | } | |
1751 | ||
43c34bc3 DG |
1752 | /* |
1753 | * Iterate over all streams of the hashtable and free them properly. | |
1754 | * | |
1755 | * WARNING: *MUST* be used with data stream only. | |
1756 | */ | |
1757 | static void destroy_data_stream_ht(struct lttng_ht *ht) | |
1758 | { | |
43c34bc3 DG |
1759 | struct lttng_ht_iter iter; |
1760 | struct lttng_consumer_stream *stream; | |
1761 | ||
1762 | if (ht == NULL) { | |
1763 | return; | |
1764 | } | |
1765 | ||
1766 | rcu_read_lock(); | |
1767 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { | |
5c540210 DG |
1768 | /* |
1769 | * Ignore return value since we are currently cleaning up so any error | |
1770 | * can't be handled. | |
1771 | */ | |
1772 | (void) consumer_del_stream(stream, ht); | |
43c34bc3 DG |
1773 | } |
1774 | rcu_read_unlock(); | |
1775 | ||
1776 | lttng_ht_destroy(ht); | |
1777 | } | |
1778 | ||
fb3a43a9 | 1779 | /* |
f724d81e | 1780 | * Iterate over all streams of the hashtable and free them properly. |
e316aad5 DG |
1781 | * |
1782 | * XXX: Should not be only for metadata stream or else use an other name. | |
fb3a43a9 DG |
1783 | */ |
1784 | static void destroy_stream_ht(struct lttng_ht *ht) | |
1785 | { | |
fb3a43a9 DG |
1786 | struct lttng_ht_iter iter; |
1787 | struct lttng_consumer_stream *stream; | |
1788 | ||
1789 | if (ht == NULL) { | |
1790 | return; | |
1791 | } | |
1792 | ||
d09e1200 | 1793 | rcu_read_lock(); |
58b1f425 | 1794 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { |
5c540210 DG |
1795 | /* |
1796 | * Ignore return value since we are currently cleaning up so any error | |
1797 | * can't be handled. | |
1798 | */ | |
1799 | (void) consumer_del_metadata_stream(stream, ht); | |
fb3a43a9 | 1800 | } |
d09e1200 | 1801 | rcu_read_unlock(); |
fb3a43a9 DG |
1802 | |
1803 | lttng_ht_destroy(ht); | |
1804 | } | |
1805 | ||
1806 | /* | |
1807 | * Clean up a metadata stream and free its memory. | |
1808 | */ | |
e316aad5 DG |
1809 | void consumer_del_metadata_stream(struct lttng_consumer_stream *stream, |
1810 | struct lttng_ht *ht) | |
fb3a43a9 DG |
1811 | { |
1812 | int ret; | |
e316aad5 DG |
1813 | struct lttng_ht_iter iter; |
1814 | struct lttng_consumer_channel *free_chan = NULL; | |
fb3a43a9 DG |
1815 | struct consumer_relayd_sock_pair *relayd; |
1816 | ||
1817 | assert(stream); | |
1818 | /* | |
1819 | * This call should NEVER receive regular stream. It must always be | |
1820 | * metadata stream and this is crucial for data structure synchronization. | |
1821 | */ | |
1822 | assert(stream->metadata_flag); | |
1823 | ||
e316aad5 DG |
1824 | DBG3("Consumer delete metadata stream %d", stream->wait_fd); |
1825 | ||
1826 | if (ht == NULL) { | |
1827 | /* Means the stream was allocated but not successfully added */ | |
1828 | goto free_stream; | |
1829 | } | |
1830 | ||
74251bb8 | 1831 | pthread_mutex_lock(&consumer_data.lock); |
8994307f DG |
1832 | pthread_mutex_lock(&stream->lock); |
1833 | ||
fb3a43a9 DG |
1834 | switch (consumer_data.type) { |
1835 | case LTTNG_CONSUMER_KERNEL: | |
1836 | if (stream->mmap_base != NULL) { | |
1837 | ret = munmap(stream->mmap_base, stream->mmap_len); | |
1838 | if (ret != 0) { | |
1839 | PERROR("munmap metadata stream"); | |
1840 | } | |
1841 | } | |
1842 | break; | |
1843 | case LTTNG_CONSUMER32_UST: | |
1844 | case LTTNG_CONSUMER64_UST: | |
1845 | lttng_ustconsumer_del_stream(stream); | |
1846 | break; | |
1847 | default: | |
1848 | ERR("Unknown consumer_data type"); | |
1849 | assert(0); | |
e316aad5 | 1850 | goto end; |
fb3a43a9 | 1851 | } |
fb3a43a9 | 1852 | |
c869f647 | 1853 | rcu_read_lock(); |
58b1f425 | 1854 | iter.iter.node = &stream->node.node; |
c869f647 DG |
1855 | ret = lttng_ht_del(ht, &iter); |
1856 | assert(!ret); | |
ca22feea DG |
1857 | |
1858 | /* Remove node session id from the consumer_data stream ht */ | |
1859 | iter.iter.node = &stream->node_session_id.node; | |
1860 | ret = lttng_ht_del(consumer_data.stream_list_ht, &iter); | |
1861 | assert(!ret); | |
c869f647 DG |
1862 | rcu_read_unlock(); |
1863 | ||
fb3a43a9 DG |
1864 | if (stream->out_fd >= 0) { |
1865 | ret = close(stream->out_fd); | |
1866 | if (ret) { | |
1867 | PERROR("close"); | |
1868 | } | |
1869 | } | |
1870 | ||
1871 | if (stream->wait_fd >= 0 && !stream->wait_fd_is_copy) { | |
1872 | ret = close(stream->wait_fd); | |
1873 | if (ret) { | |
1874 | PERROR("close"); | |
1875 | } | |
1876 | } | |
1877 | ||
1878 | if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) { | |
1879 | ret = close(stream->shm_fd); | |
1880 | if (ret) { | |
1881 | PERROR("close"); | |
1882 | } | |
1883 | } | |
1884 | ||
1885 | /* Check and cleanup relayd */ | |
1886 | rcu_read_lock(); | |
1887 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1888 | if (relayd != NULL) { | |
1889 | uatomic_dec(&relayd->refcount); | |
1890 | assert(uatomic_read(&relayd->refcount) >= 0); | |
1891 | ||
1892 | /* Closing streams requires to lock the control socket. */ | |
1893 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1894 | ret = relayd_send_close_stream(&relayd->control_sock, | |
1895 | stream->relayd_stream_id, stream->next_net_seq_num - 1); | |
1896 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1897 | if (ret < 0) { | |
1898 | DBG("Unable to close stream on the relayd. Continuing"); | |
1899 | /* | |
1900 | * Continue here. There is nothing we can do for the relayd. | |
1901 | * Chances are that the relayd has closed the socket so we just | |
1902 | * continue cleaning up. | |
1903 | */ | |
1904 | } | |
1905 | ||
1906 | /* Both conditions are met, we destroy the relayd. */ | |
1907 | if (uatomic_read(&relayd->refcount) == 0 && | |
1908 | uatomic_read(&relayd->destroy_flag)) { | |
d09e1200 | 1909 | destroy_relayd(relayd); |
fb3a43a9 DG |
1910 | } |
1911 | } | |
1912 | rcu_read_unlock(); | |
1913 | ||
1914 | /* Atomically decrement channel refcount since other threads can use it. */ | |
1915 | uatomic_dec(&stream->chan->refcount); | |
c30aaa51 MD |
1916 | if (!uatomic_read(&stream->chan->refcount) |
1917 | && !uatomic_read(&stream->chan->nb_init_streams)) { | |
1918 | /* Go for channel deletion! */ | |
e316aad5 | 1919 | free_chan = stream->chan; |
fb3a43a9 DG |
1920 | } |
1921 | ||
e316aad5 | 1922 | end: |
8994307f | 1923 | pthread_mutex_unlock(&stream->lock); |
74251bb8 | 1924 | pthread_mutex_unlock(&consumer_data.lock); |
e316aad5 DG |
1925 | |
1926 | if (free_chan) { | |
1927 | consumer_del_channel(free_chan); | |
1928 | } | |
1929 | ||
1930 | free_stream: | |
58b1f425 | 1931 | call_rcu(&stream->node.head, consumer_free_stream); |
fb3a43a9 DG |
1932 | } |
1933 | ||
1934 | /* | |
1935 | * Action done with the metadata stream when adding it to the consumer internal | |
1936 | * data structures to handle it. | |
1937 | */ | |
e316aad5 DG |
1938 | static int consumer_add_metadata_stream(struct lttng_consumer_stream *stream, |
1939 | struct lttng_ht *ht) | |
fb3a43a9 | 1940 | { |
e316aad5 | 1941 | int ret = 0; |
fb3a43a9 | 1942 | struct consumer_relayd_sock_pair *relayd; |
76082088 DG |
1943 | struct lttng_ht_iter iter; |
1944 | struct lttng_ht_node_ulong *node; | |
fb3a43a9 | 1945 | |
e316aad5 DG |
1946 | assert(stream); |
1947 | assert(ht); | |
1948 | ||
1949 | DBG3("Adding metadata stream %d to hash table", stream->wait_fd); | |
1950 | ||
1951 | pthread_mutex_lock(&consumer_data.lock); | |
2e818a6a | 1952 | pthread_mutex_lock(&stream->lock); |
e316aad5 | 1953 | |
e316aad5 DG |
1954 | /* |
1955 | * From here, refcounts are updated so be _careful_ when returning an error | |
1956 | * after this point. | |
1957 | */ | |
1958 | ||
fb3a43a9 | 1959 | rcu_read_lock(); |
76082088 DG |
1960 | |
1961 | /* | |
1962 | * Lookup the stream just to make sure it does not exist in our internal | |
1963 | * state. This should NEVER happen. | |
1964 | */ | |
1965 | lttng_ht_lookup(ht, (void *)((unsigned long) stream->wait_fd), &iter); | |
1966 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1967 | assert(!node); | |
1968 | ||
e316aad5 | 1969 | /* Find relayd and, if one is found, increment refcount. */ |
fb3a43a9 DG |
1970 | relayd = consumer_find_relayd(stream->net_seq_idx); |
1971 | if (relayd != NULL) { | |
1972 | uatomic_inc(&relayd->refcount); | |
1973 | } | |
e316aad5 DG |
1974 | |
1975 | /* Update channel refcount once added without error(s). */ | |
1976 | uatomic_inc(&stream->chan->refcount); | |
1977 | ||
1978 | /* | |
1979 | * When nb_init_streams reaches 0, we don't need to trigger any action in | |
1980 | * terms of destroying the associated channel, because the action that | |
1981 | * causes the count to become 0 also causes a stream to be added. The | |
1982 | * channel deletion will thus be triggered by the following removal of this | |
1983 | * stream. | |
1984 | */ | |
1985 | if (uatomic_read(&stream->chan->nb_init_streams) > 0) { | |
1986 | uatomic_dec(&stream->chan->nb_init_streams); | |
1987 | } | |
1988 | ||
58b1f425 | 1989 | lttng_ht_add_unique_ulong(ht, &stream->node); |
ca22feea DG |
1990 | |
1991 | /* | |
1992 | * Add stream to the stream_list_ht of the consumer data. No need to steal | |
1993 | * the key since the HT does not use it and we allow to add redundant keys | |
1994 | * into this table. | |
1995 | */ | |
1996 | lttng_ht_add_ulong(consumer_data.stream_list_ht, &stream->node_session_id); | |
1997 | ||
fb3a43a9 | 1998 | rcu_read_unlock(); |
e316aad5 | 1999 | |
2e818a6a | 2000 | pthread_mutex_unlock(&stream->lock); |
e316aad5 DG |
2001 | pthread_mutex_unlock(&consumer_data.lock); |
2002 | return ret; | |
fb3a43a9 DG |
2003 | } |
2004 | ||
8994307f DG |
2005 | /* |
2006 | * Delete data stream that are flagged for deletion (endpoint_status). | |
2007 | */ | |
2008 | static void validate_endpoint_status_data_stream(void) | |
2009 | { | |
2010 | struct lttng_ht_iter iter; | |
2011 | struct lttng_consumer_stream *stream; | |
2012 | ||
2013 | DBG("Consumer delete flagged data stream"); | |
2014 | ||
2015 | rcu_read_lock(); | |
2016 | cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) { | |
2017 | /* Validate delete flag of the stream */ | |
79d4ffb7 | 2018 | if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) { |
8994307f DG |
2019 | continue; |
2020 | } | |
2021 | /* Delete it right now */ | |
2022 | consumer_del_stream(stream, data_ht); | |
2023 | } | |
2024 | rcu_read_unlock(); | |
2025 | } | |
2026 | ||
2027 | /* | |
2028 | * Delete metadata stream that are flagged for deletion (endpoint_status). | |
2029 | */ | |
2030 | static void validate_endpoint_status_metadata_stream( | |
2031 | struct lttng_poll_event *pollset) | |
2032 | { | |
2033 | struct lttng_ht_iter iter; | |
2034 | struct lttng_consumer_stream *stream; | |
2035 | ||
2036 | DBG("Consumer delete flagged metadata stream"); | |
2037 | ||
2038 | assert(pollset); | |
2039 | ||
2040 | rcu_read_lock(); | |
2041 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) { | |
2042 | /* Validate delete flag of the stream */ | |
79d4ffb7 | 2043 | if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) { |
8994307f DG |
2044 | continue; |
2045 | } | |
2046 | /* | |
2047 | * Remove from pollset so the metadata thread can continue without | |
2048 | * blocking on a deleted stream. | |
2049 | */ | |
2050 | lttng_poll_del(pollset, stream->wait_fd); | |
2051 | ||
2052 | /* Delete it right now */ | |
2053 | consumer_del_metadata_stream(stream, metadata_ht); | |
2054 | } | |
2055 | rcu_read_unlock(); | |
2056 | } | |
2057 | ||
fb3a43a9 DG |
2058 | /* |
2059 | * Thread polls on metadata file descriptor and write them on disk or on the | |
2060 | * network. | |
2061 | */ | |
7d980def | 2062 | void *consumer_thread_metadata_poll(void *data) |
fb3a43a9 DG |
2063 | { |
2064 | int ret, i, pollfd; | |
2065 | uint32_t revents, nb_fd; | |
e316aad5 | 2066 | struct lttng_consumer_stream *stream = NULL; |
fb3a43a9 DG |
2067 | struct lttng_ht_iter iter; |
2068 | struct lttng_ht_node_ulong *node; | |
fb3a43a9 DG |
2069 | struct lttng_poll_event events; |
2070 | struct lttng_consumer_local_data *ctx = data; | |
2071 | ssize_t len; | |
2072 | ||
2073 | rcu_register_thread(); | |
2074 | ||
04bb2b64 DG |
2075 | metadata_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2076 | if (!metadata_ht) { | |
2077 | /* ENOMEM at this point. Better to bail out. */ | |
2078 | goto error; | |
2079 | } | |
2080 | ||
fb3a43a9 DG |
2081 | DBG("Thread metadata poll started"); |
2082 | ||
fb3a43a9 DG |
2083 | /* Size is set to 1 for the consumer_metadata pipe */ |
2084 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
2085 | if (ret < 0) { | |
2086 | ERR("Poll set creation failed"); | |
2087 | goto end; | |
2088 | } | |
2089 | ||
2090 | ret = lttng_poll_add(&events, ctx->consumer_metadata_pipe[0], LPOLLIN); | |
2091 | if (ret < 0) { | |
2092 | goto end; | |
2093 | } | |
2094 | ||
2095 | /* Main loop */ | |
2096 | DBG("Metadata main loop started"); | |
2097 | ||
2098 | while (1) { | |
2099 | lttng_poll_reset(&events); | |
2100 | ||
2101 | nb_fd = LTTNG_POLL_GETNB(&events); | |
2102 | ||
2103 | /* Only the metadata pipe is set */ | |
2104 | if (nb_fd == 0 && consumer_quit == 1) { | |
2105 | goto end; | |
2106 | } | |
2107 | ||
2108 | restart: | |
2109 | DBG("Metadata poll wait with %d fd(s)", nb_fd); | |
2110 | ret = lttng_poll_wait(&events, -1); | |
2111 | DBG("Metadata event catched in thread"); | |
2112 | if (ret < 0) { | |
2113 | if (errno == EINTR) { | |
e316aad5 | 2114 | ERR("Poll EINTR catched"); |
fb3a43a9 DG |
2115 | goto restart; |
2116 | } | |
2117 | goto error; | |
2118 | } | |
2119 | ||
e316aad5 | 2120 | /* From here, the event is a metadata wait fd */ |
fb3a43a9 DG |
2121 | for (i = 0; i < nb_fd; i++) { |
2122 | revents = LTTNG_POLL_GETEV(&events, i); | |
2123 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2124 | ||
e316aad5 DG |
2125 | /* Just don't waste time if no returned events for the fd */ |
2126 | if (!revents) { | |
2127 | continue; | |
2128 | } | |
2129 | ||
fb3a43a9 | 2130 | if (pollfd == ctx->consumer_metadata_pipe[0]) { |
4adabd61 | 2131 | if (revents & (LPOLLERR | LPOLLHUP )) { |
fb3a43a9 DG |
2132 | DBG("Metadata thread pipe hung up"); |
2133 | /* | |
2134 | * Remove the pipe from the poll set and continue the loop | |
2135 | * since their might be data to consume. | |
2136 | */ | |
2137 | lttng_poll_del(&events, ctx->consumer_metadata_pipe[0]); | |
f66c074c DG |
2138 | ret = close(ctx->consumer_metadata_pipe[0]); |
2139 | if (ret < 0) { | |
2140 | PERROR("close metadata pipe"); | |
2141 | } | |
fb3a43a9 DG |
2142 | continue; |
2143 | } else if (revents & LPOLLIN) { | |
fb3a43a9 | 2144 | do { |
633d0084 DG |
2145 | /* Get the stream pointer received */ |
2146 | ret = read(pollfd, &stream, sizeof(stream)); | |
fb3a43a9 | 2147 | } while (ret < 0 && errno == EINTR); |
633d0084 DG |
2148 | if (ret < 0 || |
2149 | ret < sizeof(struct lttng_consumer_stream *)) { | |
fb3a43a9 | 2150 | PERROR("read metadata stream"); |
fb3a43a9 DG |
2151 | /* |
2152 | * Let's continue here and hope we can still work | |
2153 | * without stopping the consumer. XXX: Should we? | |
2154 | */ | |
2155 | continue; | |
2156 | } | |
2157 | ||
8994307f DG |
2158 | /* A NULL stream means that the state has changed. */ |
2159 | if (stream == NULL) { | |
2160 | /* Check for deleted streams. */ | |
2161 | validate_endpoint_status_metadata_stream(&events); | |
2162 | continue; | |
2163 | } | |
2164 | ||
fb3a43a9 DG |
2165 | DBG("Adding metadata stream %d to poll set", |
2166 | stream->wait_fd); | |
2167 | ||
e316aad5 DG |
2168 | ret = consumer_add_metadata_stream(stream, metadata_ht); |
2169 | if (ret) { | |
2170 | ERR("Unable to add metadata stream"); | |
2171 | /* Stream was not setup properly. Continuing. */ | |
2172 | consumer_del_metadata_stream(stream, NULL); | |
2173 | continue; | |
2174 | } | |
fb3a43a9 DG |
2175 | |
2176 | /* Add metadata stream to the global poll events list */ | |
2177 | lttng_poll_add(&events, stream->wait_fd, | |
2178 | LPOLLIN | LPOLLPRI); | |
fb3a43a9 DG |
2179 | } |
2180 | ||
e316aad5 | 2181 | /* Handle other stream */ |
fb3a43a9 DG |
2182 | continue; |
2183 | } | |
2184 | ||
d09e1200 | 2185 | rcu_read_lock(); |
fb3a43a9 DG |
2186 | lttng_ht_lookup(metadata_ht, (void *)((unsigned long) pollfd), |
2187 | &iter); | |
2188 | node = lttng_ht_iter_get_node_ulong(&iter); | |
e316aad5 | 2189 | assert(node); |
fb3a43a9 DG |
2190 | |
2191 | stream = caa_container_of(node, struct lttng_consumer_stream, | |
58b1f425 | 2192 | node); |
fb3a43a9 | 2193 | |
e316aad5 | 2194 | /* Check for error event */ |
4adabd61 | 2195 | if (revents & (LPOLLERR | LPOLLHUP)) { |
e316aad5 | 2196 | DBG("Metadata fd %d is hup|err.", pollfd); |
fb3a43a9 DG |
2197 | if (!stream->hangup_flush_done |
2198 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
2199 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
2200 | DBG("Attempting to flush and consume the UST buffers"); | |
2201 | lttng_ustconsumer_on_stream_hangup(stream); | |
2202 | ||
2203 | /* We just flushed the stream now read it. */ | |
4bb94b75 DG |
2204 | do { |
2205 | len = ctx->on_buffer_ready(stream, ctx); | |
2206 | /* | |
2207 | * We don't check the return value here since if we get | |
2208 | * a negative len, it means an error occured thus we | |
2209 | * simply remove it from the poll set and free the | |
2210 | * stream. | |
2211 | */ | |
2212 | } while (len > 0); | |
fb3a43a9 DG |
2213 | } |
2214 | ||
fb3a43a9 | 2215 | lttng_poll_del(&events, stream->wait_fd); |
e316aad5 DG |
2216 | /* |
2217 | * This call update the channel states, closes file descriptors | |
2218 | * and securely free the stream. | |
2219 | */ | |
2220 | consumer_del_metadata_stream(stream, metadata_ht); | |
2221 | } else if (revents & (LPOLLIN | LPOLLPRI)) { | |
2222 | /* Get the data out of the metadata file descriptor */ | |
2223 | DBG("Metadata available on fd %d", pollfd); | |
2224 | assert(stream->wait_fd == pollfd); | |
2225 | ||
2226 | len = ctx->on_buffer_ready(stream, ctx); | |
2227 | /* It's ok to have an unavailable sub-buffer */ | |
b64403e3 | 2228 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2229 | /* Clean up stream from consumer and free it. */ |
2230 | lttng_poll_del(&events, stream->wait_fd); | |
2231 | consumer_del_metadata_stream(stream, metadata_ht); | |
e316aad5 DG |
2232 | } else if (len > 0) { |
2233 | stream->data_read = 1; | |
2234 | } | |
fb3a43a9 | 2235 | } |
e316aad5 DG |
2236 | |
2237 | /* Release RCU lock for the stream looked up */ | |
d09e1200 | 2238 | rcu_read_unlock(); |
fb3a43a9 DG |
2239 | } |
2240 | } | |
2241 | ||
2242 | error: | |
2243 | end: | |
2244 | DBG("Metadata poll thread exiting"); | |
2245 | lttng_poll_clean(&events); | |
2246 | ||
04bb2b64 | 2247 | destroy_stream_ht(metadata_ht); |
fb3a43a9 DG |
2248 | |
2249 | rcu_unregister_thread(); | |
2250 | return NULL; | |
2251 | } | |
2252 | ||
3bd1e081 | 2253 | /* |
e4421fec | 2254 | * This thread polls the fds in the set to consume the data and write |
3bd1e081 MD |
2255 | * it to tracefile if necessary. |
2256 | */ | |
7d980def | 2257 | void *consumer_thread_data_poll(void *data) |
3bd1e081 MD |
2258 | { |
2259 | int num_rdy, num_hup, high_prio, ret, i; | |
2260 | struct pollfd *pollfd = NULL; | |
2261 | /* local view of the streams */ | |
c869f647 | 2262 | struct lttng_consumer_stream **local_stream = NULL, *new_stream = NULL; |
3bd1e081 MD |
2263 | /* local view of consumer_data.fds_count */ |
2264 | int nb_fd = 0; | |
3bd1e081 | 2265 | struct lttng_consumer_local_data *ctx = data; |
00e2e675 | 2266 | ssize_t len; |
3bd1e081 | 2267 | |
e7b994a3 DG |
2268 | rcu_register_thread(); |
2269 | ||
43c34bc3 DG |
2270 | data_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2271 | if (data_ht == NULL) { | |
04bb2b64 | 2272 | /* ENOMEM at this point. Better to bail out. */ |
43c34bc3 DG |
2273 | goto end; |
2274 | } | |
2275 | ||
effcf122 | 2276 | local_stream = zmalloc(sizeof(struct lttng_consumer_stream)); |
3bd1e081 MD |
2277 | |
2278 | while (1) { | |
2279 | high_prio = 0; | |
2280 | num_hup = 0; | |
2281 | ||
2282 | /* | |
e4421fec | 2283 | * the fds set has been updated, we need to update our |
3bd1e081 MD |
2284 | * local array as well |
2285 | */ | |
2286 | pthread_mutex_lock(&consumer_data.lock); | |
2287 | if (consumer_data.need_update) { | |
2288 | if (pollfd != NULL) { | |
2289 | free(pollfd); | |
2290 | pollfd = NULL; | |
2291 | } | |
2292 | if (local_stream != NULL) { | |
2293 | free(local_stream); | |
2294 | local_stream = NULL; | |
2295 | } | |
2296 | ||
50f8ae69 | 2297 | /* allocate for all fds + 1 for the consumer_data_pipe */ |
effcf122 | 2298 | pollfd = zmalloc((consumer_data.stream_count + 1) * sizeof(struct pollfd)); |
3bd1e081 | 2299 | if (pollfd == NULL) { |
7a57cf92 | 2300 | PERROR("pollfd malloc"); |
3bd1e081 MD |
2301 | pthread_mutex_unlock(&consumer_data.lock); |
2302 | goto end; | |
2303 | } | |
2304 | ||
50f8ae69 | 2305 | /* allocate for all fds + 1 for the consumer_data_pipe */ |
effcf122 | 2306 | local_stream = zmalloc((consumer_data.stream_count + 1) * |
3bd1e081 MD |
2307 | sizeof(struct lttng_consumer_stream)); |
2308 | if (local_stream == NULL) { | |
7a57cf92 | 2309 | PERROR("local_stream malloc"); |
3bd1e081 MD |
2310 | pthread_mutex_unlock(&consumer_data.lock); |
2311 | goto end; | |
2312 | } | |
43c34bc3 DG |
2313 | ret = consumer_update_poll_array(ctx, &pollfd, local_stream, |
2314 | data_ht); | |
3bd1e081 MD |
2315 | if (ret < 0) { |
2316 | ERR("Error in allocating pollfd or local_outfds"); | |
f73fabfd | 2317 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
2318 | pthread_mutex_unlock(&consumer_data.lock); |
2319 | goto end; | |
2320 | } | |
2321 | nb_fd = ret; | |
2322 | consumer_data.need_update = 0; | |
2323 | } | |
2324 | pthread_mutex_unlock(&consumer_data.lock); | |
2325 | ||
4078b776 MD |
2326 | /* No FDs and consumer_quit, consumer_cleanup the thread */ |
2327 | if (nb_fd == 0 && consumer_quit == 1) { | |
2328 | goto end; | |
2329 | } | |
3bd1e081 | 2330 | /* poll on the array of fds */ |
88f2b785 | 2331 | restart: |
3bd1e081 | 2332 | DBG("polling on %d fd", nb_fd + 1); |
cb365c03 | 2333 | num_rdy = poll(pollfd, nb_fd + 1, -1); |
3bd1e081 MD |
2334 | DBG("poll num_rdy : %d", num_rdy); |
2335 | if (num_rdy == -1) { | |
88f2b785 MD |
2336 | /* |
2337 | * Restart interrupted system call. | |
2338 | */ | |
2339 | if (errno == EINTR) { | |
2340 | goto restart; | |
2341 | } | |
7a57cf92 | 2342 | PERROR("Poll error"); |
f73fabfd | 2343 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
2344 | goto end; |
2345 | } else if (num_rdy == 0) { | |
2346 | DBG("Polling thread timed out"); | |
2347 | goto end; | |
2348 | } | |
2349 | ||
3bd1e081 | 2350 | /* |
50f8ae69 | 2351 | * If the consumer_data_pipe triggered poll go directly to the |
00e2e675 DG |
2352 | * beginning of the loop to update the array. We want to prioritize |
2353 | * array update over low-priority reads. | |
3bd1e081 | 2354 | */ |
509bb1cf | 2355 | if (pollfd[nb_fd].revents & (POLLIN | POLLPRI)) { |
04fdd819 | 2356 | size_t pipe_readlen; |
04fdd819 | 2357 | |
50f8ae69 | 2358 | DBG("consumer_data_pipe wake up"); |
04fdd819 MD |
2359 | /* Consume 1 byte of pipe data */ |
2360 | do { | |
50f8ae69 | 2361 | pipe_readlen = read(ctx->consumer_data_pipe[0], &new_stream, |
c869f647 | 2362 | sizeof(new_stream)); |
04fdd819 | 2363 | } while (pipe_readlen == -1 && errno == EINTR); |
c869f647 DG |
2364 | |
2365 | /* | |
2366 | * If the stream is NULL, just ignore it. It's also possible that | |
2367 | * the sessiond poll thread changed the consumer_quit state and is | |
2368 | * waking us up to test it. | |
2369 | */ | |
2370 | if (new_stream == NULL) { | |
8994307f | 2371 | validate_endpoint_status_data_stream(); |
c869f647 DG |
2372 | continue; |
2373 | } | |
2374 | ||
43c34bc3 | 2375 | ret = consumer_add_stream(new_stream, data_ht); |
c869f647 DG |
2376 | if (ret) { |
2377 | ERR("Consumer add stream %d failed. Continuing", | |
2378 | new_stream->key); | |
2379 | /* | |
2380 | * At this point, if the add_stream fails, it is not in the | |
2381 | * hash table thus passing the NULL value here. | |
2382 | */ | |
2383 | consumer_del_stream(new_stream, NULL); | |
2384 | } | |
2385 | ||
2386 | /* Continue to update the local streams and handle prio ones */ | |
3bd1e081 MD |
2387 | continue; |
2388 | } | |
2389 | ||
2390 | /* Take care of high priority channels first. */ | |
2391 | for (i = 0; i < nb_fd; i++) { | |
9617607b DG |
2392 | if (local_stream[i] == NULL) { |
2393 | continue; | |
2394 | } | |
fb3a43a9 | 2395 | if (pollfd[i].revents & POLLPRI) { |
d41f73b7 MD |
2396 | DBG("Urgent read on fd %d", pollfd[i].fd); |
2397 | high_prio = 1; | |
4078b776 | 2398 | len = ctx->on_buffer_ready(local_stream[i], ctx); |
d41f73b7 | 2399 | /* it's ok to have an unavailable sub-buffer */ |
b64403e3 | 2400 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2401 | /* Clean the stream and free it. */ |
2402 | consumer_del_stream(local_stream[i], data_ht); | |
9617607b | 2403 | local_stream[i] = NULL; |
4078b776 MD |
2404 | } else if (len > 0) { |
2405 | local_stream[i]->data_read = 1; | |
d41f73b7 | 2406 | } |
3bd1e081 MD |
2407 | } |
2408 | } | |
2409 | ||
4078b776 MD |
2410 | /* |
2411 | * If we read high prio channel in this loop, try again | |
2412 | * for more high prio data. | |
2413 | */ | |
2414 | if (high_prio) { | |
3bd1e081 MD |
2415 | continue; |
2416 | } | |
2417 | ||
2418 | /* Take care of low priority channels. */ | |
4078b776 | 2419 | for (i = 0; i < nb_fd; i++) { |
9617607b DG |
2420 | if (local_stream[i] == NULL) { |
2421 | continue; | |
2422 | } | |
4078b776 MD |
2423 | if ((pollfd[i].revents & POLLIN) || |
2424 | local_stream[i]->hangup_flush_done) { | |
4078b776 MD |
2425 | DBG("Normal read on fd %d", pollfd[i].fd); |
2426 | len = ctx->on_buffer_ready(local_stream[i], ctx); | |
2427 | /* it's ok to have an unavailable sub-buffer */ | |
b64403e3 | 2428 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2429 | /* Clean the stream and free it. */ |
2430 | consumer_del_stream(local_stream[i], data_ht); | |
9617607b | 2431 | local_stream[i] = NULL; |
4078b776 MD |
2432 | } else if (len > 0) { |
2433 | local_stream[i]->data_read = 1; | |
2434 | } | |
2435 | } | |
2436 | } | |
2437 | ||
2438 | /* Handle hangup and errors */ | |
2439 | for (i = 0; i < nb_fd; i++) { | |
9617607b DG |
2440 | if (local_stream[i] == NULL) { |
2441 | continue; | |
2442 | } | |
4078b776 MD |
2443 | if (!local_stream[i]->hangup_flush_done |
2444 | && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL)) | |
2445 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
2446 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
2447 | DBG("fd %d is hup|err|nval. Attempting flush and read.", | |
9617607b | 2448 | pollfd[i].fd); |
4078b776 MD |
2449 | lttng_ustconsumer_on_stream_hangup(local_stream[i]); |
2450 | /* Attempt read again, for the data we just flushed. */ | |
2451 | local_stream[i]->data_read = 1; | |
2452 | } | |
2453 | /* | |
2454 | * If the poll flag is HUP/ERR/NVAL and we have | |
2455 | * read no data in this pass, we can remove the | |
2456 | * stream from its hash table. | |
2457 | */ | |
2458 | if ((pollfd[i].revents & POLLHUP)) { | |
2459 | DBG("Polling fd %d tells it has hung up.", pollfd[i].fd); | |
2460 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2461 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2462 | local_stream[i] = NULL; |
4078b776 MD |
2463 | num_hup++; |
2464 | } | |
2465 | } else if (pollfd[i].revents & POLLERR) { | |
2466 | ERR("Error returned in polling fd %d.", pollfd[i].fd); | |
2467 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2468 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2469 | local_stream[i] = NULL; |
4078b776 MD |
2470 | num_hup++; |
2471 | } | |
2472 | } else if (pollfd[i].revents & POLLNVAL) { | |
2473 | ERR("Polling fd %d tells fd is not open.", pollfd[i].fd); | |
2474 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2475 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2476 | local_stream[i] = NULL; |
4078b776 | 2477 | num_hup++; |
3bd1e081 MD |
2478 | } |
2479 | } | |
9617607b DG |
2480 | if (local_stream[i] != NULL) { |
2481 | local_stream[i]->data_read = 0; | |
2482 | } | |
3bd1e081 MD |
2483 | } |
2484 | } | |
2485 | end: | |
2486 | DBG("polling thread exiting"); | |
2487 | if (pollfd != NULL) { | |
2488 | free(pollfd); | |
2489 | pollfd = NULL; | |
2490 | } | |
2491 | if (local_stream != NULL) { | |
2492 | free(local_stream); | |
2493 | local_stream = NULL; | |
2494 | } | |
fb3a43a9 DG |
2495 | |
2496 | /* | |
2497 | * Close the write side of the pipe so epoll_wait() in | |
7d980def DG |
2498 | * consumer_thread_metadata_poll can catch it. The thread is monitoring the |
2499 | * read side of the pipe. If we close them both, epoll_wait strangely does | |
2500 | * not return and could create a endless wait period if the pipe is the | |
2501 | * only tracked fd in the poll set. The thread will take care of closing | |
2502 | * the read side. | |
fb3a43a9 | 2503 | */ |
f66c074c DG |
2504 | ret = close(ctx->consumer_metadata_pipe[1]); |
2505 | if (ret < 0) { | |
2506 | PERROR("close data pipe"); | |
2507 | } | |
fb3a43a9 | 2508 | |
04bb2b64 | 2509 | destroy_data_stream_ht(data_ht); |
43c34bc3 | 2510 | |
e7b994a3 | 2511 | rcu_unregister_thread(); |
3bd1e081 MD |
2512 | return NULL; |
2513 | } | |
2514 | ||
2515 | /* | |
2516 | * This thread listens on the consumerd socket and receives the file | |
2517 | * descriptors from the session daemon. | |
2518 | */ | |
7d980def | 2519 | void *consumer_thread_sessiond_poll(void *data) |
3bd1e081 | 2520 | { |
d96f09c6 | 2521 | int sock = -1, client_socket, ret; |
3bd1e081 MD |
2522 | /* |
2523 | * structure to poll for incoming data on communication socket avoids | |
2524 | * making blocking sockets. | |
2525 | */ | |
2526 | struct pollfd consumer_sockpoll[2]; | |
2527 | struct lttng_consumer_local_data *ctx = data; | |
2528 | ||
e7b994a3 DG |
2529 | rcu_register_thread(); |
2530 | ||
3bd1e081 MD |
2531 | DBG("Creating command socket %s", ctx->consumer_command_sock_path); |
2532 | unlink(ctx->consumer_command_sock_path); | |
2533 | client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path); | |
2534 | if (client_socket < 0) { | |
2535 | ERR("Cannot create command socket"); | |
2536 | goto end; | |
2537 | } | |
2538 | ||
2539 | ret = lttcomm_listen_unix_sock(client_socket); | |
2540 | if (ret < 0) { | |
2541 | goto end; | |
2542 | } | |
2543 | ||
32258573 | 2544 | DBG("Sending ready command to lttng-sessiond"); |
f73fabfd | 2545 | ret = lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_COMMAND_SOCK_READY); |
3bd1e081 MD |
2546 | /* return < 0 on error, but == 0 is not fatal */ |
2547 | if (ret < 0) { | |
32258573 | 2548 | ERR("Error sending ready command to lttng-sessiond"); |
3bd1e081 MD |
2549 | goto end; |
2550 | } | |
2551 | ||
2552 | ret = fcntl(client_socket, F_SETFL, O_NONBLOCK); | |
2553 | if (ret < 0) { | |
7a57cf92 | 2554 | PERROR("fcntl O_NONBLOCK"); |
3bd1e081 MD |
2555 | goto end; |
2556 | } | |
2557 | ||
2558 | /* prepare the FDs to poll : to client socket and the should_quit pipe */ | |
2559 | consumer_sockpoll[0].fd = ctx->consumer_should_quit[0]; | |
2560 | consumer_sockpoll[0].events = POLLIN | POLLPRI; | |
2561 | consumer_sockpoll[1].fd = client_socket; | |
2562 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
2563 | ||
2564 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2565 | goto end; | |
2566 | } | |
2567 | DBG("Connection on client_socket"); | |
2568 | ||
2569 | /* Blocking call, waiting for transmission */ | |
2570 | sock = lttcomm_accept_unix_sock(client_socket); | |
2571 | if (sock <= 0) { | |
2572 | WARN("On accept"); | |
2573 | goto end; | |
2574 | } | |
2575 | ret = fcntl(sock, F_SETFL, O_NONBLOCK); | |
2576 | if (ret < 0) { | |
7a57cf92 | 2577 | PERROR("fcntl O_NONBLOCK"); |
3bd1e081 MD |
2578 | goto end; |
2579 | } | |
2580 | ||
d96f09c6 DG |
2581 | /* This socket is not useful anymore. */ |
2582 | ret = close(client_socket); | |
2583 | if (ret < 0) { | |
2584 | PERROR("close client_socket"); | |
2585 | } | |
2586 | client_socket = -1; | |
2587 | ||
3bd1e081 MD |
2588 | /* update the polling structure to poll on the established socket */ |
2589 | consumer_sockpoll[1].fd = sock; | |
2590 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
2591 | ||
2592 | while (1) { | |
2593 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2594 | goto end; | |
2595 | } | |
2596 | DBG("Incoming command on sock"); | |
2597 | ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
2598 | if (ret == -ENOENT) { | |
2599 | DBG("Received STOP command"); | |
2600 | goto end; | |
2601 | } | |
4cbc1a04 DG |
2602 | if (ret <= 0) { |
2603 | /* | |
2604 | * This could simply be a session daemon quitting. Don't output | |
2605 | * ERR() here. | |
2606 | */ | |
2607 | DBG("Communication interrupted on command socket"); | |
3bd1e081 MD |
2608 | goto end; |
2609 | } | |
2610 | if (consumer_quit) { | |
2611 | DBG("consumer_thread_receive_fds received quit from signal"); | |
2612 | goto end; | |
2613 | } | |
2614 | DBG("received fds on sock"); | |
2615 | } | |
2616 | end: | |
2617 | DBG("consumer_thread_receive_fds exiting"); | |
2618 | ||
2619 | /* | |
2620 | * when all fds have hung up, the polling thread | |
2621 | * can exit cleanly | |
2622 | */ | |
2623 | consumer_quit = 1; | |
2624 | ||
04fdd819 | 2625 | /* |
c869f647 | 2626 | * Notify the data poll thread to poll back again and test the |
8994307f | 2627 | * consumer_quit state that we just set so to quit gracefully. |
04fdd819 | 2628 | */ |
8994307f | 2629 | notify_thread_pipe(ctx->consumer_data_pipe[1]); |
c869f647 | 2630 | |
d96f09c6 DG |
2631 | /* Cleaning up possibly open sockets. */ |
2632 | if (sock >= 0) { | |
2633 | ret = close(sock); | |
2634 | if (ret < 0) { | |
2635 | PERROR("close sock sessiond poll"); | |
2636 | } | |
2637 | } | |
2638 | if (client_socket >= 0) { | |
2639 | ret = close(sock); | |
2640 | if (ret < 0) { | |
2641 | PERROR("close client_socket sessiond poll"); | |
2642 | } | |
2643 | } | |
2644 | ||
e7b994a3 | 2645 | rcu_unregister_thread(); |
3bd1e081 MD |
2646 | return NULL; |
2647 | } | |
d41f73b7 | 2648 | |
4078b776 | 2649 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
2650 | struct lttng_consumer_local_data *ctx) |
2651 | { | |
74251bb8 DG |
2652 | ssize_t ret; |
2653 | ||
2654 | pthread_mutex_lock(&stream->lock); | |
2655 | ||
d41f73b7 MD |
2656 | switch (consumer_data.type) { |
2657 | case LTTNG_CONSUMER_KERNEL: | |
74251bb8 DG |
2658 | ret = lttng_kconsumer_read_subbuffer(stream, ctx); |
2659 | break; | |
7753dea8 MD |
2660 | case LTTNG_CONSUMER32_UST: |
2661 | case LTTNG_CONSUMER64_UST: | |
74251bb8 DG |
2662 | ret = lttng_ustconsumer_read_subbuffer(stream, ctx); |
2663 | break; | |
d41f73b7 MD |
2664 | default: |
2665 | ERR("Unknown consumer_data type"); | |
2666 | assert(0); | |
74251bb8 DG |
2667 | ret = -ENOSYS; |
2668 | break; | |
d41f73b7 | 2669 | } |
74251bb8 DG |
2670 | |
2671 | pthread_mutex_unlock(&stream->lock); | |
2672 | return ret; | |
d41f73b7 MD |
2673 | } |
2674 | ||
2675 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
2676 | { | |
2677 | switch (consumer_data.type) { | |
2678 | case LTTNG_CONSUMER_KERNEL: | |
2679 | return lttng_kconsumer_on_recv_stream(stream); | |
7753dea8 MD |
2680 | case LTTNG_CONSUMER32_UST: |
2681 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
2682 | return lttng_ustconsumer_on_recv_stream(stream); |
2683 | default: | |
2684 | ERR("Unknown consumer_data type"); | |
2685 | assert(0); | |
2686 | return -ENOSYS; | |
2687 | } | |
2688 | } | |
e4421fec DG |
2689 | |
2690 | /* | |
2691 | * Allocate and set consumer data hash tables. | |
2692 | */ | |
2693 | void lttng_consumer_init(void) | |
2694 | { | |
e4421fec | 2695 | consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
00e2e675 | 2696 | consumer_data.relayd_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
53632229 | 2697 | consumer_data.stream_list_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
46e6455f | 2698 | relayd_session_id_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
e4421fec | 2699 | } |
7735ef9e DG |
2700 | |
2701 | /* | |
2702 | * Process the ADD_RELAYD command receive by a consumer. | |
2703 | * | |
2704 | * This will create a relayd socket pair and add it to the relayd hash table. | |
2705 | * The caller MUST acquire a RCU read side lock before calling it. | |
2706 | */ | |
2707 | int consumer_add_relayd_socket(int net_seq_idx, int sock_type, | |
2708 | struct lttng_consumer_local_data *ctx, int sock, | |
46e6455f DG |
2709 | struct pollfd *consumer_sockpoll, struct lttcomm_sock *relayd_sock, |
2710 | unsigned int sessiond_id) | |
7735ef9e | 2711 | { |
4028eeb9 | 2712 | int fd = -1, ret = -1; |
f50f23d9 | 2713 | enum lttng_error_code ret_code = LTTNG_OK; |
7735ef9e | 2714 | struct consumer_relayd_sock_pair *relayd; |
46e6455f | 2715 | struct consumer_relayd_session_id *relayd_id_node; |
7735ef9e DG |
2716 | |
2717 | DBG("Consumer adding relayd socket (idx: %d)", net_seq_idx); | |
2718 | ||
f50f23d9 DG |
2719 | /* First send a status message before receiving the fds. */ |
2720 | ret = consumer_send_status_msg(sock, ret_code); | |
2721 | if (ret < 0) { | |
2722 | /* Somehow, the session daemon is not responding anymore. */ | |
2723 | goto error; | |
2724 | } | |
2725 | ||
7735ef9e DG |
2726 | /* Get relayd reference if exists. */ |
2727 | relayd = consumer_find_relayd(net_seq_idx); | |
2728 | if (relayd == NULL) { | |
2729 | /* Not found. Allocate one. */ | |
2730 | relayd = consumer_allocate_relayd_sock_pair(net_seq_idx); | |
2731 | if (relayd == NULL) { | |
f73fabfd | 2732 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
7735ef9e DG |
2733 | goto error; |
2734 | } | |
2735 | } | |
2736 | ||
2737 | /* Poll on consumer socket. */ | |
2738 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2739 | ret = -EINTR; | |
2740 | goto error; | |
2741 | } | |
2742 | ||
2743 | /* Get relayd socket from session daemon */ | |
2744 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); | |
2745 | if (ret != sizeof(fd)) { | |
f73fabfd | 2746 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
7735ef9e | 2747 | ret = -1; |
4028eeb9 | 2748 | fd = -1; /* Just in case it gets set with an invalid value. */ |
7735ef9e DG |
2749 | goto error; |
2750 | } | |
2751 | ||
f50f23d9 DG |
2752 | /* We have the fds without error. Send status back. */ |
2753 | ret = consumer_send_status_msg(sock, ret_code); | |
2754 | if (ret < 0) { | |
2755 | /* Somehow, the session daemon is not responding anymore. */ | |
2756 | goto error; | |
2757 | } | |
2758 | ||
7735ef9e DG |
2759 | /* Copy socket information and received FD */ |
2760 | switch (sock_type) { | |
2761 | case LTTNG_STREAM_CONTROL: | |
2762 | /* Copy received lttcomm socket */ | |
2763 | lttcomm_copy_sock(&relayd->control_sock, relayd_sock); | |
2764 | ret = lttcomm_create_sock(&relayd->control_sock); | |
4028eeb9 DG |
2765 | /* Immediately try to close the created socket if valid. */ |
2766 | if (relayd->control_sock.fd >= 0) { | |
2767 | if (close(relayd->control_sock.fd)) { | |
2768 | PERROR("close relayd control socket"); | |
2769 | } | |
7735ef9e | 2770 | } |
4028eeb9 | 2771 | /* Handle create_sock error. */ |
f66c074c | 2772 | if (ret < 0) { |
4028eeb9 | 2773 | goto error; |
f66c074c | 2774 | } |
7735ef9e DG |
2775 | |
2776 | /* Assign new file descriptor */ | |
2777 | relayd->control_sock.fd = fd; | |
c5b6f4f0 DG |
2778 | |
2779 | /* | |
2780 | * Create a session on the relayd and store the returned id. No need to | |
2781 | * grab the socket lock since the relayd object is not yet visible. | |
2782 | */ | |
2783 | ret = relayd_create_session(&relayd->control_sock, | |
2784 | &relayd->session_id); | |
2785 | if (ret < 0) { | |
2786 | goto error; | |
2787 | } | |
2788 | ||
46e6455f DG |
2789 | /* Set up a relayd session id node. */ |
2790 | relayd_id_node = zmalloc(sizeof(struct consumer_relayd_session_id)); | |
2791 | if (!relayd_id_node) { | |
2792 | PERROR("zmalloc relayd id node"); | |
2793 | goto error; | |
2794 | } | |
2795 | ||
2796 | relayd_id_node->relayd_id = relayd->session_id; | |
2797 | relayd_id_node->sessiond_id = (uint64_t) sessiond_id; | |
2798 | ||
2799 | /* Indexed by session id of the session daemon. */ | |
2800 | lttng_ht_node_init_ulong(&relayd_id_node->node, | |
2801 | relayd_id_node->sessiond_id); | |
2802 | rcu_read_lock(); | |
2803 | lttng_ht_add_unique_ulong(relayd_session_id_ht, &relayd_id_node->node); | |
2804 | rcu_read_unlock(); | |
2805 | ||
7735ef9e DG |
2806 | break; |
2807 | case LTTNG_STREAM_DATA: | |
2808 | /* Copy received lttcomm socket */ | |
2809 | lttcomm_copy_sock(&relayd->data_sock, relayd_sock); | |
2810 | ret = lttcomm_create_sock(&relayd->data_sock); | |
4028eeb9 DG |
2811 | /* Immediately try to close the created socket if valid. */ |
2812 | if (relayd->data_sock.fd >= 0) { | |
2813 | if (close(relayd->data_sock.fd)) { | |
2814 | PERROR("close relayd data socket"); | |
2815 | } | |
7735ef9e | 2816 | } |
4028eeb9 | 2817 | /* Handle create_sock error. */ |
f66c074c | 2818 | if (ret < 0) { |
4028eeb9 | 2819 | goto error; |
f66c074c | 2820 | } |
7735ef9e DG |
2821 | |
2822 | /* Assign new file descriptor */ | |
2823 | relayd->data_sock.fd = fd; | |
2824 | break; | |
2825 | default: | |
2826 | ERR("Unknown relayd socket type (%d)", sock_type); | |
2827 | goto error; | |
2828 | } | |
2829 | ||
2830 | DBG("Consumer %s socket created successfully with net idx %d (fd: %d)", | |
2831 | sock_type == LTTNG_STREAM_CONTROL ? "control" : "data", | |
2832 | relayd->net_seq_idx, fd); | |
2833 | ||
2834 | /* | |
2835 | * Add relayd socket pair to consumer data hashtable. If object already | |
2836 | * exists or on error, the function gracefully returns. | |
2837 | */ | |
d09e1200 | 2838 | add_relayd(relayd); |
7735ef9e DG |
2839 | |
2840 | /* All good! */ | |
4028eeb9 | 2841 | return 0; |
7735ef9e DG |
2842 | |
2843 | error: | |
4028eeb9 DG |
2844 | /* Close received socket if valid. */ |
2845 | if (fd >= 0) { | |
2846 | if (close(fd)) { | |
2847 | PERROR("close received socket"); | |
2848 | } | |
2849 | } | |
7735ef9e DG |
2850 | return ret; |
2851 | } | |
ca22feea | 2852 | |
4e9a4686 DG |
2853 | /* |
2854 | * Try to lock the stream mutex. | |
2855 | * | |
2856 | * On success, 1 is returned else 0 indicating that the mutex is NOT lock. | |
2857 | */ | |
2858 | static int stream_try_lock(struct lttng_consumer_stream *stream) | |
2859 | { | |
2860 | int ret; | |
2861 | ||
2862 | assert(stream); | |
2863 | ||
2864 | /* | |
2865 | * Try to lock the stream mutex. On failure, we know that the stream is | |
2866 | * being used else where hence there is data still being extracted. | |
2867 | */ | |
2868 | ret = pthread_mutex_trylock(&stream->lock); | |
2869 | if (ret) { | |
2870 | /* For both EBUSY and EINVAL error, the mutex is NOT locked. */ | |
2871 | ret = 0; | |
2872 | goto end; | |
2873 | } | |
2874 | ||
2875 | ret = 1; | |
2876 | ||
2877 | end: | |
2878 | return ret; | |
2879 | } | |
2880 | ||
ca22feea DG |
2881 | /* |
2882 | * Check if for a given session id there is still data needed to be extract | |
2883 | * from the buffers. | |
2884 | * | |
6d805429 | 2885 | * Return 1 if data is pending or else 0 meaning ready to be read. |
ca22feea | 2886 | */ |
6d805429 | 2887 | int consumer_data_pending(uint64_t id) |
ca22feea DG |
2888 | { |
2889 | int ret; | |
2890 | struct lttng_ht_iter iter; | |
2891 | struct lttng_ht *ht; | |
2892 | struct lttng_consumer_stream *stream; | |
c8f59ee5 | 2893 | struct consumer_relayd_sock_pair *relayd; |
6d805429 | 2894 | int (*data_pending)(struct lttng_consumer_stream *); |
ca22feea | 2895 | |
6d805429 | 2896 | DBG("Consumer data pending command on session id %" PRIu64, id); |
ca22feea | 2897 | |
6f6eda74 | 2898 | rcu_read_lock(); |
ca22feea DG |
2899 | pthread_mutex_lock(&consumer_data.lock); |
2900 | ||
2901 | switch (consumer_data.type) { | |
2902 | case LTTNG_CONSUMER_KERNEL: | |
6d805429 | 2903 | data_pending = lttng_kconsumer_data_pending; |
ca22feea DG |
2904 | break; |
2905 | case LTTNG_CONSUMER32_UST: | |
2906 | case LTTNG_CONSUMER64_UST: | |
6d805429 | 2907 | data_pending = lttng_ustconsumer_data_pending; |
ca22feea DG |
2908 | break; |
2909 | default: | |
2910 | ERR("Unknown consumer data type"); | |
2911 | assert(0); | |
2912 | } | |
2913 | ||
2914 | /* Ease our life a bit */ | |
2915 | ht = consumer_data.stream_list_ht; | |
2916 | ||
c8f59ee5 | 2917 | cds_lfht_for_each_entry_duplicate(ht->ht, |
b6314938 | 2918 | ht->hash_fct((void *)((unsigned long) id), lttng_ht_seed), |
ca22feea DG |
2919 | ht->match_fct, (void *)((unsigned long) id), |
2920 | &iter.iter, stream, node_session_id.node) { | |
4e9a4686 DG |
2921 | /* If this call fails, the stream is being used hence data pending. */ |
2922 | ret = stream_try_lock(stream); | |
2923 | if (!ret) { | |
6d805429 | 2924 | goto data_not_pending; |
ca22feea | 2925 | } |
ca22feea | 2926 | |
4e9a4686 DG |
2927 | /* |
2928 | * A removed node from the hash table indicates that the stream has | |
2929 | * been deleted thus having a guarantee that the buffers are closed | |
2930 | * on the consumer side. However, data can still be transmitted | |
2931 | * over the network so don't skip the relayd check. | |
2932 | */ | |
2933 | ret = cds_lfht_is_node_deleted(&stream->node.node); | |
2934 | if (!ret) { | |
2935 | /* Check the stream if there is data in the buffers. */ | |
6d805429 DG |
2936 | ret = data_pending(stream); |
2937 | if (ret == 1) { | |
4e9a4686 | 2938 | pthread_mutex_unlock(&stream->lock); |
6d805429 | 2939 | goto data_not_pending; |
4e9a4686 DG |
2940 | } |
2941 | } | |
2942 | ||
2943 | /* Relayd check */ | |
c8f59ee5 DG |
2944 | if (stream->net_seq_idx != -1) { |
2945 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
4e9a4686 DG |
2946 | if (!relayd) { |
2947 | /* | |
2948 | * At this point, if the relayd object is not available for the | |
2949 | * given stream, it is because the relayd is being cleaned up | |
2950 | * so every stream associated with it (for a session id value) | |
2951 | * are or will be marked for deletion hence no data pending. | |
2952 | */ | |
2953 | pthread_mutex_unlock(&stream->lock); | |
6d805429 | 2954 | goto data_not_pending; |
4e9a4686 | 2955 | } |
c8f59ee5 | 2956 | |
c8f59ee5 DG |
2957 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); |
2958 | if (stream->metadata_flag) { | |
2959 | ret = relayd_quiescent_control(&relayd->control_sock); | |
2960 | } else { | |
6d805429 | 2961 | ret = relayd_data_pending(&relayd->control_sock, |
c8f59ee5 DG |
2962 | stream->relayd_stream_id, stream->next_net_seq_num); |
2963 | } | |
2964 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
6d805429 | 2965 | if (ret == 1) { |
4e9a4686 | 2966 | pthread_mutex_unlock(&stream->lock); |
6d805429 | 2967 | goto data_not_pending; |
c8f59ee5 DG |
2968 | } |
2969 | } | |
4e9a4686 | 2970 | pthread_mutex_unlock(&stream->lock); |
c8f59ee5 | 2971 | } |
ca22feea DG |
2972 | |
2973 | /* | |
2974 | * Finding _no_ node in the hash table means that the stream(s) have been | |
2975 | * removed thus data is guaranteed to be available for analysis from the | |
2976 | * trace files. This is *only* true for local consumer and not network | |
2977 | * streaming. | |
2978 | */ | |
2979 | ||
2980 | /* Data is available to be read by a viewer. */ | |
2981 | pthread_mutex_unlock(&consumer_data.lock); | |
c8f59ee5 | 2982 | rcu_read_unlock(); |
6d805429 | 2983 | return 0; |
ca22feea | 2984 | |
6d805429 | 2985 | data_not_pending: |
ca22feea DG |
2986 | /* Data is still being extracted from buffers. */ |
2987 | pthread_mutex_unlock(&consumer_data.lock); | |
c8f59ee5 | 2988 | rcu_read_unlock(); |
6d805429 | 2989 | return 1; |
ca22feea | 2990 | } |
f50f23d9 DG |
2991 | |
2992 | /* | |
2993 | * Send a ret code status message to the sessiond daemon. | |
2994 | * | |
2995 | * Return the sendmsg() return value. | |
2996 | */ | |
2997 | int consumer_send_status_msg(int sock, int ret_code) | |
2998 | { | |
2999 | struct lttcomm_consumer_status_msg msg; | |
3000 | ||
3001 | msg.ret_code = ret_code; | |
3002 | ||
3003 | return lttcomm_send_unix_sock(sock, &msg, sizeof(msg)); | |
3004 | } |