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 | ||
50 | /* timeout parameter, to control the polling thread grace period. */ | |
51 | int consumer_poll_timeout = -1; | |
52 | ||
53 | /* | |
54 | * Flag to inform the polling thread to quit when all fd hung up. Updated by | |
55 | * the consumer_thread_receive_fds when it notices that all fds has hung up. | |
56 | * Also updated by the signal handler (consumer_should_exit()). Read by the | |
57 | * polling threads. | |
58 | */ | |
59 | volatile int consumer_quit = 0; | |
60 | ||
43c34bc3 DG |
61 | /* |
62 | * The following two hash tables are visible by all threads which are separated | |
63 | * in different source files. | |
64 | * | |
65 | * Global hash table containing respectively metadata and data streams. The | |
66 | * stream element in this ht should only be updated by the metadata poll thread | |
67 | * for the metadata and the data poll thread for the data. | |
68 | */ | |
69 | struct lttng_ht *metadata_ht = NULL; | |
70 | struct lttng_ht *data_ht = NULL; | |
71 | ||
3bd1e081 MD |
72 | /* |
73 | * Find a stream. The consumer_data.lock must be locked during this | |
74 | * call. | |
75 | */ | |
8389e4f8 DG |
76 | static struct lttng_consumer_stream *consumer_find_stream(int key, |
77 | struct lttng_ht *ht) | |
3bd1e081 | 78 | { |
e4421fec DG |
79 | struct lttng_ht_iter iter; |
80 | struct lttng_ht_node_ulong *node; | |
81 | struct lttng_consumer_stream *stream = NULL; | |
3bd1e081 | 82 | |
8389e4f8 DG |
83 | assert(ht); |
84 | ||
7ad0a0cb | 85 | /* Negative keys are lookup failures */ |
7a57cf92 | 86 | if (key < 0) { |
7ad0a0cb | 87 | return NULL; |
7a57cf92 | 88 | } |
e4421fec | 89 | |
6065ceec DG |
90 | rcu_read_lock(); |
91 | ||
8389e4f8 | 92 | lttng_ht_lookup(ht, (void *)((unsigned long) key), &iter); |
e4421fec DG |
93 | node = lttng_ht_iter_get_node_ulong(&iter); |
94 | if (node != NULL) { | |
95 | stream = caa_container_of(node, struct lttng_consumer_stream, node); | |
3bd1e081 | 96 | } |
e4421fec | 97 | |
6065ceec DG |
98 | rcu_read_unlock(); |
99 | ||
e4421fec | 100 | return stream; |
3bd1e081 MD |
101 | } |
102 | ||
c869f647 | 103 | void consumer_steal_stream_key(int key, struct lttng_ht *ht) |
7ad0a0cb MD |
104 | { |
105 | struct lttng_consumer_stream *stream; | |
106 | ||
04253271 | 107 | rcu_read_lock(); |
8389e4f8 | 108 | stream = consumer_find_stream(key, ht); |
04253271 | 109 | if (stream) { |
7ad0a0cb | 110 | stream->key = -1; |
04253271 MD |
111 | /* |
112 | * We don't want the lookup to match, but we still need | |
113 | * to iterate on this stream when iterating over the hash table. Just | |
114 | * change the node key. | |
115 | */ | |
116 | stream->node.key = -1; | |
117 | } | |
118 | rcu_read_unlock(); | |
7ad0a0cb MD |
119 | } |
120 | ||
3bd1e081 MD |
121 | static struct lttng_consumer_channel *consumer_find_channel(int key) |
122 | { | |
e4421fec DG |
123 | struct lttng_ht_iter iter; |
124 | struct lttng_ht_node_ulong *node; | |
125 | struct lttng_consumer_channel *channel = NULL; | |
3bd1e081 | 126 | |
7ad0a0cb | 127 | /* Negative keys are lookup failures */ |
7a57cf92 | 128 | if (key < 0) { |
7ad0a0cb | 129 | return NULL; |
7a57cf92 | 130 | } |
e4421fec | 131 | |
6065ceec DG |
132 | rcu_read_lock(); |
133 | ||
e4421fec DG |
134 | lttng_ht_lookup(consumer_data.channel_ht, (void *)((unsigned long) key), |
135 | &iter); | |
136 | node = lttng_ht_iter_get_node_ulong(&iter); | |
137 | if (node != NULL) { | |
138 | channel = caa_container_of(node, struct lttng_consumer_channel, node); | |
3bd1e081 | 139 | } |
e4421fec | 140 | |
6065ceec DG |
141 | rcu_read_unlock(); |
142 | ||
e4421fec | 143 | return channel; |
3bd1e081 MD |
144 | } |
145 | ||
7ad0a0cb MD |
146 | static void consumer_steal_channel_key(int key) |
147 | { | |
148 | struct lttng_consumer_channel *channel; | |
149 | ||
04253271 | 150 | rcu_read_lock(); |
7ad0a0cb | 151 | channel = consumer_find_channel(key); |
04253271 | 152 | if (channel) { |
7ad0a0cb | 153 | channel->key = -1; |
04253271 MD |
154 | /* |
155 | * We don't want the lookup to match, but we still need | |
156 | * to iterate on this channel when iterating over the hash table. Just | |
157 | * change the node key. | |
158 | */ | |
159 | channel->node.key = -1; | |
160 | } | |
161 | rcu_read_unlock(); | |
7ad0a0cb MD |
162 | } |
163 | ||
702b1ea4 MD |
164 | static |
165 | void consumer_free_stream(struct rcu_head *head) | |
166 | { | |
167 | struct lttng_ht_node_ulong *node = | |
168 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
169 | struct lttng_consumer_stream *stream = | |
170 | caa_container_of(node, struct lttng_consumer_stream, node); | |
171 | ||
172 | free(stream); | |
173 | } | |
174 | ||
e316aad5 DG |
175 | static |
176 | void consumer_free_metadata_stream(struct rcu_head *head) | |
177 | { | |
178 | struct lttng_ht_node_ulong *node = | |
179 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
180 | struct lttng_consumer_stream *stream = | |
181 | caa_container_of(node, struct lttng_consumer_stream, waitfd_node); | |
182 | ||
183 | free(stream); | |
184 | } | |
185 | ||
00e2e675 DG |
186 | /* |
187 | * RCU protected relayd socket pair free. | |
188 | */ | |
189 | static void consumer_rcu_free_relayd(struct rcu_head *head) | |
190 | { | |
191 | struct lttng_ht_node_ulong *node = | |
192 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
193 | struct consumer_relayd_sock_pair *relayd = | |
194 | caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
195 | ||
196 | free(relayd); | |
197 | } | |
198 | ||
199 | /* | |
200 | * Destroy and free relayd socket pair object. | |
201 | * | |
202 | * This function MUST be called with the consumer_data lock acquired. | |
203 | */ | |
d09e1200 | 204 | static void destroy_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
205 | { |
206 | int ret; | |
207 | struct lttng_ht_iter iter; | |
208 | ||
173af62f DG |
209 | if (relayd == NULL) { |
210 | return; | |
211 | } | |
212 | ||
00e2e675 DG |
213 | DBG("Consumer destroy and close relayd socket pair"); |
214 | ||
215 | iter.iter.node = &relayd->node.node; | |
216 | ret = lttng_ht_del(consumer_data.relayd_ht, &iter); | |
173af62f DG |
217 | if (ret != 0) { |
218 | /* We assume the relayd was already destroyed */ | |
219 | return; | |
220 | } | |
00e2e675 DG |
221 | |
222 | /* Close all sockets */ | |
223 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
224 | (void) relayd_close(&relayd->control_sock); | |
225 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
226 | (void) relayd_close(&relayd->data_sock); | |
227 | ||
228 | /* RCU free() call */ | |
229 | call_rcu(&relayd->node.head, consumer_rcu_free_relayd); | |
230 | } | |
231 | ||
a6ba4fe1 DG |
232 | /* |
233 | * Flag a relayd socket pair for destruction. Destroy it if the refcount | |
234 | * reaches zero. | |
235 | * | |
236 | * RCU read side lock MUST be aquired before calling this function. | |
237 | */ | |
238 | void consumer_flag_relayd_for_destroy(struct consumer_relayd_sock_pair *relayd) | |
239 | { | |
240 | assert(relayd); | |
241 | ||
242 | /* Set destroy flag for this object */ | |
243 | uatomic_set(&relayd->destroy_flag, 1); | |
244 | ||
245 | /* Destroy the relayd if refcount is 0 */ | |
246 | if (uatomic_read(&relayd->refcount) == 0) { | |
d09e1200 | 247 | destroy_relayd(relayd); |
a6ba4fe1 DG |
248 | } |
249 | } | |
250 | ||
3bd1e081 MD |
251 | /* |
252 | * Remove a stream from the global list protected by a mutex. This | |
253 | * function is also responsible for freeing its data structures. | |
254 | */ | |
e316aad5 DG |
255 | void consumer_del_stream(struct lttng_consumer_stream *stream, |
256 | struct lttng_ht *ht) | |
3bd1e081 MD |
257 | { |
258 | int ret; | |
e4421fec | 259 | struct lttng_ht_iter iter; |
3bd1e081 | 260 | struct lttng_consumer_channel *free_chan = NULL; |
00e2e675 DG |
261 | struct consumer_relayd_sock_pair *relayd; |
262 | ||
263 | assert(stream); | |
3bd1e081 | 264 | |
e316aad5 DG |
265 | if (ht == NULL) { |
266 | /* Means the stream was allocated but not successfully added */ | |
267 | goto free_stream; | |
268 | } | |
269 | ||
3bd1e081 MD |
270 | pthread_mutex_lock(&consumer_data.lock); |
271 | ||
272 | switch (consumer_data.type) { | |
273 | case LTTNG_CONSUMER_KERNEL: | |
274 | if (stream->mmap_base != NULL) { | |
275 | ret = munmap(stream->mmap_base, stream->mmap_len); | |
276 | if (ret != 0) { | |
7a57cf92 | 277 | PERROR("munmap"); |
3bd1e081 MD |
278 | } |
279 | } | |
280 | break; | |
7753dea8 MD |
281 | case LTTNG_CONSUMER32_UST: |
282 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
283 | lttng_ustconsumer_del_stream(stream); |
284 | break; | |
285 | default: | |
286 | ERR("Unknown consumer_data type"); | |
287 | assert(0); | |
288 | goto end; | |
289 | } | |
290 | ||
6065ceec | 291 | rcu_read_lock(); |
04253271 | 292 | iter.iter.node = &stream->node.node; |
e316aad5 | 293 | ret = lttng_ht_del(ht, &iter); |
04253271 | 294 | assert(!ret); |
e4421fec | 295 | |
6065ceec DG |
296 | rcu_read_unlock(); |
297 | ||
3bd1e081 MD |
298 | if (consumer_data.stream_count <= 0) { |
299 | goto end; | |
300 | } | |
301 | consumer_data.stream_count--; | |
302 | if (!stream) { | |
303 | goto end; | |
304 | } | |
305 | if (stream->out_fd >= 0) { | |
4c462e79 MD |
306 | ret = close(stream->out_fd); |
307 | if (ret) { | |
308 | PERROR("close"); | |
309 | } | |
3bd1e081 | 310 | } |
b5c5fc29 | 311 | if (stream->wait_fd >= 0 && !stream->wait_fd_is_copy) { |
4c462e79 MD |
312 | ret = close(stream->wait_fd); |
313 | if (ret) { | |
314 | PERROR("close"); | |
315 | } | |
3bd1e081 | 316 | } |
2c1dd183 | 317 | if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) { |
4c462e79 MD |
318 | ret = close(stream->shm_fd); |
319 | if (ret) { | |
320 | PERROR("close"); | |
321 | } | |
3bd1e081 | 322 | } |
00e2e675 DG |
323 | |
324 | /* Check and cleanup relayd */ | |
b0b335c8 | 325 | rcu_read_lock(); |
00e2e675 DG |
326 | relayd = consumer_find_relayd(stream->net_seq_idx); |
327 | if (relayd != NULL) { | |
b0b335c8 MD |
328 | uatomic_dec(&relayd->refcount); |
329 | assert(uatomic_read(&relayd->refcount) >= 0); | |
173af62f | 330 | |
3f8e211f DG |
331 | /* Closing streams requires to lock the control socket. */ |
332 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
173af62f DG |
333 | ret = relayd_send_close_stream(&relayd->control_sock, |
334 | stream->relayd_stream_id, | |
335 | stream->next_net_seq_num - 1); | |
3f8e211f | 336 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); |
173af62f | 337 | if (ret < 0) { |
a4b92340 DG |
338 | DBG("Unable to close stream on the relayd. Continuing"); |
339 | /* | |
340 | * Continue here. There is nothing we can do for the relayd. | |
341 | * Chances are that the relayd has closed the socket so we just | |
342 | * continue cleaning up. | |
343 | */ | |
173af62f DG |
344 | } |
345 | ||
346 | /* Both conditions are met, we destroy the relayd. */ | |
347 | if (uatomic_read(&relayd->refcount) == 0 && | |
348 | uatomic_read(&relayd->destroy_flag)) { | |
d09e1200 | 349 | destroy_relayd(relayd); |
00e2e675 | 350 | } |
00e2e675 | 351 | } |
b0b335c8 | 352 | rcu_read_unlock(); |
00e2e675 | 353 | |
c30aaa51 MD |
354 | uatomic_dec(&stream->chan->refcount); |
355 | if (!uatomic_read(&stream->chan->refcount) | |
356 | && !uatomic_read(&stream->chan->nb_init_streams)) { | |
3bd1e081 | 357 | free_chan = stream->chan; |
00e2e675 DG |
358 | } |
359 | ||
3bd1e081 MD |
360 | end: |
361 | consumer_data.need_update = 1; | |
362 | pthread_mutex_unlock(&consumer_data.lock); | |
363 | ||
c30aaa51 | 364 | if (free_chan) { |
3bd1e081 | 365 | consumer_del_channel(free_chan); |
c30aaa51 | 366 | } |
e316aad5 DG |
367 | |
368 | free_stream: | |
369 | call_rcu(&stream->node.head, consumer_free_stream); | |
3bd1e081 MD |
370 | } |
371 | ||
372 | struct lttng_consumer_stream *consumer_allocate_stream( | |
373 | int channel_key, int stream_key, | |
374 | int shm_fd, int wait_fd, | |
375 | enum lttng_consumer_stream_state state, | |
376 | uint64_t mmap_len, | |
377 | enum lttng_event_output output, | |
6df2e2c9 MD |
378 | const char *path_name, |
379 | uid_t uid, | |
00e2e675 DG |
380 | gid_t gid, |
381 | int net_index, | |
c80048c6 MD |
382 | int metadata_flag, |
383 | int *alloc_ret) | |
3bd1e081 MD |
384 | { |
385 | struct lttng_consumer_stream *stream; | |
3bd1e081 | 386 | |
effcf122 | 387 | stream = zmalloc(sizeof(*stream)); |
3bd1e081 | 388 | if (stream == NULL) { |
7a57cf92 | 389 | PERROR("malloc struct lttng_consumer_stream"); |
c80048c6 | 390 | *alloc_ret = -ENOMEM; |
7a57cf92 | 391 | goto end; |
3bd1e081 | 392 | } |
7a57cf92 DG |
393 | |
394 | /* | |
395 | * Get stream's channel reference. Needed when adding the stream to the | |
396 | * global hash table. | |
397 | */ | |
3bd1e081 MD |
398 | stream->chan = consumer_find_channel(channel_key); |
399 | if (!stream->chan) { | |
c80048c6 | 400 | *alloc_ret = -ENOENT; |
7a57cf92 | 401 | ERR("Unable to find channel for stream %d", stream_key); |
c80048c6 | 402 | goto error; |
3bd1e081 | 403 | } |
e316aad5 | 404 | |
3bd1e081 MD |
405 | stream->key = stream_key; |
406 | stream->shm_fd = shm_fd; | |
407 | stream->wait_fd = wait_fd; | |
408 | stream->out_fd = -1; | |
409 | stream->out_fd_offset = 0; | |
410 | stream->state = state; | |
411 | stream->mmap_len = mmap_len; | |
412 | stream->mmap_base = NULL; | |
413 | stream->output = output; | |
6df2e2c9 MD |
414 | stream->uid = uid; |
415 | stream->gid = gid; | |
00e2e675 DG |
416 | stream->net_seq_idx = net_index; |
417 | stream->metadata_flag = metadata_flag; | |
418 | strncpy(stream->path_name, path_name, sizeof(stream->path_name)); | |
419 | stream->path_name[sizeof(stream->path_name) - 1] = '\0'; | |
00e2e675 | 420 | lttng_ht_node_init_ulong(&stream->waitfd_node, stream->wait_fd); |
e316aad5 | 421 | lttng_ht_node_init_ulong(&stream->node, stream->key); |
c30aaa51 | 422 | |
c869f647 DG |
423 | /* |
424 | * The cpu number is needed before using any ustctl_* actions. Ignored for | |
425 | * the kernel so the value does not matter. | |
426 | */ | |
427 | pthread_mutex_lock(&consumer_data.lock); | |
428 | stream->cpu = stream->chan->cpucount++; | |
429 | pthread_mutex_unlock(&consumer_data.lock); | |
430 | ||
c30aaa51 MD |
431 | DBG3("Allocated stream %s (key %d, shm_fd %d, wait_fd %d, mmap_len %llu," |
432 | " out_fd %d, net_seq_idx %d)", stream->path_name, stream->key, | |
433 | stream->shm_fd, stream->wait_fd, | |
434 | (unsigned long long) stream->mmap_len, stream->out_fd, | |
00e2e675 | 435 | stream->net_seq_idx); |
3bd1e081 | 436 | return stream; |
c80048c6 MD |
437 | |
438 | error: | |
439 | free(stream); | |
7a57cf92 | 440 | end: |
c80048c6 | 441 | return NULL; |
3bd1e081 MD |
442 | } |
443 | ||
444 | /* | |
445 | * Add a stream to the global list protected by a mutex. | |
446 | */ | |
43c34bc3 DG |
447 | static int consumer_add_stream(struct lttng_consumer_stream *stream, |
448 | struct lttng_ht *ht) | |
3bd1e081 MD |
449 | { |
450 | int ret = 0; | |
00e2e675 | 451 | struct consumer_relayd_sock_pair *relayd; |
3bd1e081 | 452 | |
e316aad5 | 453 | assert(stream); |
43c34bc3 | 454 | assert(ht); |
c77fc10a | 455 | |
e316aad5 DG |
456 | DBG3("Adding consumer stream %d", stream->key); |
457 | ||
458 | pthread_mutex_lock(&consumer_data.lock); | |
b0b335c8 | 459 | rcu_read_lock(); |
e316aad5 | 460 | |
43c34bc3 DG |
461 | /* Steal stream identifier to avoid having streams with the same key */ |
462 | consumer_steal_stream_key(stream->key, ht); | |
463 | ||
464 | lttng_ht_add_unique_ulong(ht, &stream->node); | |
00e2e675 DG |
465 | |
466 | /* Check and cleanup relayd */ | |
467 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
468 | if (relayd != NULL) { | |
b0b335c8 | 469 | uatomic_inc(&relayd->refcount); |
00e2e675 DG |
470 | } |
471 | ||
e316aad5 DG |
472 | /* Update channel refcount once added without error(s). */ |
473 | uatomic_inc(&stream->chan->refcount); | |
474 | ||
475 | /* | |
476 | * When nb_init_streams reaches 0, we don't need to trigger any action in | |
477 | * terms of destroying the associated channel, because the action that | |
478 | * causes the count to become 0 also causes a stream to be added. The | |
479 | * channel deletion will thus be triggered by the following removal of this | |
480 | * stream. | |
481 | */ | |
482 | if (uatomic_read(&stream->chan->nb_init_streams) > 0) { | |
483 | uatomic_dec(&stream->chan->nb_init_streams); | |
484 | } | |
485 | ||
486 | /* Update consumer data once the node is inserted. */ | |
3bd1e081 MD |
487 | consumer_data.stream_count++; |
488 | consumer_data.need_update = 1; | |
489 | ||
e316aad5 | 490 | rcu_read_unlock(); |
3bd1e081 | 491 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 492 | |
3bd1e081 MD |
493 | return ret; |
494 | } | |
495 | ||
00e2e675 | 496 | /* |
3f8e211f DG |
497 | * Add relayd socket to global consumer data hashtable. RCU read side lock MUST |
498 | * be acquired before calling this. | |
00e2e675 | 499 | */ |
d09e1200 | 500 | static int add_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
501 | { |
502 | int ret = 0; | |
503 | struct lttng_ht_node_ulong *node; | |
504 | struct lttng_ht_iter iter; | |
505 | ||
506 | if (relayd == NULL) { | |
507 | ret = -1; | |
508 | goto end; | |
509 | } | |
510 | ||
00e2e675 DG |
511 | lttng_ht_lookup(consumer_data.relayd_ht, |
512 | (void *)((unsigned long) relayd->net_seq_idx), &iter); | |
513 | node = lttng_ht_iter_get_node_ulong(&iter); | |
514 | if (node != NULL) { | |
00e2e675 DG |
515 | /* Relayd already exist. Ignore the insertion */ |
516 | goto end; | |
517 | } | |
518 | lttng_ht_add_unique_ulong(consumer_data.relayd_ht, &relayd->node); | |
519 | ||
00e2e675 DG |
520 | end: |
521 | return ret; | |
522 | } | |
523 | ||
524 | /* | |
525 | * Allocate and return a consumer relayd socket. | |
526 | */ | |
527 | struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair( | |
528 | int net_seq_idx) | |
529 | { | |
530 | struct consumer_relayd_sock_pair *obj = NULL; | |
531 | ||
532 | /* Negative net sequence index is a failure */ | |
533 | if (net_seq_idx < 0) { | |
534 | goto error; | |
535 | } | |
536 | ||
537 | obj = zmalloc(sizeof(struct consumer_relayd_sock_pair)); | |
538 | if (obj == NULL) { | |
539 | PERROR("zmalloc relayd sock"); | |
540 | goto error; | |
541 | } | |
542 | ||
543 | obj->net_seq_idx = net_seq_idx; | |
544 | obj->refcount = 0; | |
173af62f | 545 | obj->destroy_flag = 0; |
00e2e675 DG |
546 | lttng_ht_node_init_ulong(&obj->node, obj->net_seq_idx); |
547 | pthread_mutex_init(&obj->ctrl_sock_mutex, NULL); | |
548 | ||
549 | error: | |
550 | return obj; | |
551 | } | |
552 | ||
553 | /* | |
554 | * Find a relayd socket pair in the global consumer data. | |
555 | * | |
556 | * Return the object if found else NULL. | |
b0b335c8 MD |
557 | * RCU read-side lock must be held across this call and while using the |
558 | * returned object. | |
00e2e675 DG |
559 | */ |
560 | struct consumer_relayd_sock_pair *consumer_find_relayd(int key) | |
561 | { | |
562 | struct lttng_ht_iter iter; | |
563 | struct lttng_ht_node_ulong *node; | |
564 | struct consumer_relayd_sock_pair *relayd = NULL; | |
565 | ||
566 | /* Negative keys are lookup failures */ | |
567 | if (key < 0) { | |
568 | goto error; | |
569 | } | |
570 | ||
00e2e675 DG |
571 | lttng_ht_lookup(consumer_data.relayd_ht, (void *)((unsigned long) key), |
572 | &iter); | |
573 | node = lttng_ht_iter_get_node_ulong(&iter); | |
574 | if (node != NULL) { | |
575 | relayd = caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
576 | } | |
577 | ||
00e2e675 DG |
578 | error: |
579 | return relayd; | |
580 | } | |
581 | ||
582 | /* | |
583 | * Handle stream for relayd transmission if the stream applies for network | |
584 | * streaming where the net sequence index is set. | |
585 | * | |
586 | * Return destination file descriptor or negative value on error. | |
587 | */ | |
6197aea7 | 588 | static int write_relayd_stream_header(struct lttng_consumer_stream *stream, |
1d4dfdef DG |
589 | size_t data_size, unsigned long padding, |
590 | struct consumer_relayd_sock_pair *relayd) | |
00e2e675 DG |
591 | { |
592 | int outfd = -1, ret; | |
00e2e675 DG |
593 | struct lttcomm_relayd_data_hdr data_hdr; |
594 | ||
595 | /* Safety net */ | |
596 | assert(stream); | |
6197aea7 | 597 | assert(relayd); |
00e2e675 DG |
598 | |
599 | /* Reset data header */ | |
600 | memset(&data_hdr, 0, sizeof(data_hdr)); | |
601 | ||
00e2e675 DG |
602 | if (stream->metadata_flag) { |
603 | /* Caller MUST acquire the relayd control socket lock */ | |
604 | ret = relayd_send_metadata(&relayd->control_sock, data_size); | |
605 | if (ret < 0) { | |
606 | goto error; | |
607 | } | |
608 | ||
609 | /* Metadata are always sent on the control socket. */ | |
610 | outfd = relayd->control_sock.fd; | |
611 | } else { | |
612 | /* Set header with stream information */ | |
613 | data_hdr.stream_id = htobe64(stream->relayd_stream_id); | |
614 | data_hdr.data_size = htobe32(data_size); | |
1d4dfdef | 615 | data_hdr.padding_size = htobe32(padding); |
173af62f | 616 | data_hdr.net_seq_num = htobe64(stream->next_net_seq_num++); |
00e2e675 DG |
617 | /* Other fields are zeroed previously */ |
618 | ||
619 | ret = relayd_send_data_hdr(&relayd->data_sock, &data_hdr, | |
620 | sizeof(data_hdr)); | |
621 | if (ret < 0) { | |
622 | goto error; | |
623 | } | |
624 | ||
625 | /* Set to go on data socket */ | |
626 | outfd = relayd->data_sock.fd; | |
627 | } | |
628 | ||
629 | error: | |
630 | return outfd; | |
631 | } | |
632 | ||
3bd1e081 MD |
633 | /* |
634 | * Update a stream according to what we just received. | |
635 | */ | |
636 | void consumer_change_stream_state(int stream_key, | |
637 | enum lttng_consumer_stream_state state) | |
638 | { | |
639 | struct lttng_consumer_stream *stream; | |
640 | ||
641 | pthread_mutex_lock(&consumer_data.lock); | |
8389e4f8 | 642 | stream = consumer_find_stream(stream_key, consumer_data.stream_ht); |
3bd1e081 MD |
643 | if (stream) { |
644 | stream->state = state; | |
645 | } | |
646 | consumer_data.need_update = 1; | |
647 | pthread_mutex_unlock(&consumer_data.lock); | |
648 | } | |
649 | ||
702b1ea4 MD |
650 | static |
651 | void consumer_free_channel(struct rcu_head *head) | |
652 | { | |
653 | struct lttng_ht_node_ulong *node = | |
654 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
655 | struct lttng_consumer_channel *channel = | |
656 | caa_container_of(node, struct lttng_consumer_channel, node); | |
657 | ||
658 | free(channel); | |
659 | } | |
660 | ||
3bd1e081 MD |
661 | /* |
662 | * Remove a channel from the global list protected by a mutex. This | |
663 | * function is also responsible for freeing its data structures. | |
664 | */ | |
665 | void consumer_del_channel(struct lttng_consumer_channel *channel) | |
666 | { | |
667 | int ret; | |
e4421fec | 668 | struct lttng_ht_iter iter; |
3bd1e081 MD |
669 | |
670 | pthread_mutex_lock(&consumer_data.lock); | |
671 | ||
672 | switch (consumer_data.type) { | |
673 | case LTTNG_CONSUMER_KERNEL: | |
674 | break; | |
7753dea8 MD |
675 | case LTTNG_CONSUMER32_UST: |
676 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
677 | lttng_ustconsumer_del_channel(channel); |
678 | break; | |
679 | default: | |
680 | ERR("Unknown consumer_data type"); | |
681 | assert(0); | |
682 | goto end; | |
683 | } | |
684 | ||
6065ceec | 685 | rcu_read_lock(); |
04253271 MD |
686 | iter.iter.node = &channel->node.node; |
687 | ret = lttng_ht_del(consumer_data.channel_ht, &iter); | |
688 | assert(!ret); | |
6065ceec DG |
689 | rcu_read_unlock(); |
690 | ||
3bd1e081 MD |
691 | if (channel->mmap_base != NULL) { |
692 | ret = munmap(channel->mmap_base, channel->mmap_len); | |
693 | if (ret != 0) { | |
7a57cf92 | 694 | PERROR("munmap"); |
3bd1e081 MD |
695 | } |
696 | } | |
b5c5fc29 | 697 | if (channel->wait_fd >= 0 && !channel->wait_fd_is_copy) { |
4c462e79 MD |
698 | ret = close(channel->wait_fd); |
699 | if (ret) { | |
700 | PERROR("close"); | |
701 | } | |
3bd1e081 | 702 | } |
2c1dd183 | 703 | if (channel->shm_fd >= 0 && channel->wait_fd != channel->shm_fd) { |
4c462e79 MD |
704 | ret = close(channel->shm_fd); |
705 | if (ret) { | |
706 | PERROR("close"); | |
707 | } | |
3bd1e081 | 708 | } |
702b1ea4 MD |
709 | |
710 | call_rcu(&channel->node.head, consumer_free_channel); | |
3bd1e081 MD |
711 | end: |
712 | pthread_mutex_unlock(&consumer_data.lock); | |
713 | } | |
714 | ||
715 | struct lttng_consumer_channel *consumer_allocate_channel( | |
716 | int channel_key, | |
717 | int shm_fd, int wait_fd, | |
718 | uint64_t mmap_len, | |
c30aaa51 MD |
719 | uint64_t max_sb_size, |
720 | unsigned int nb_init_streams) | |
3bd1e081 MD |
721 | { |
722 | struct lttng_consumer_channel *channel; | |
723 | int ret; | |
724 | ||
276b26d1 | 725 | channel = zmalloc(sizeof(*channel)); |
3bd1e081 | 726 | if (channel == NULL) { |
7a57cf92 | 727 | PERROR("malloc struct lttng_consumer_channel"); |
3bd1e081 MD |
728 | goto end; |
729 | } | |
730 | channel->key = channel_key; | |
731 | channel->shm_fd = shm_fd; | |
732 | channel->wait_fd = wait_fd; | |
733 | channel->mmap_len = mmap_len; | |
734 | channel->max_sb_size = max_sb_size; | |
735 | channel->refcount = 0; | |
c30aaa51 | 736 | channel->nb_init_streams = nb_init_streams; |
e4421fec | 737 | lttng_ht_node_init_ulong(&channel->node, channel->key); |
3bd1e081 MD |
738 | |
739 | switch (consumer_data.type) { | |
740 | case LTTNG_CONSUMER_KERNEL: | |
741 | channel->mmap_base = NULL; | |
742 | channel->mmap_len = 0; | |
743 | break; | |
7753dea8 MD |
744 | case LTTNG_CONSUMER32_UST: |
745 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
746 | ret = lttng_ustconsumer_allocate_channel(channel); |
747 | if (ret) { | |
748 | free(channel); | |
749 | return NULL; | |
750 | } | |
751 | break; | |
752 | default: | |
753 | ERR("Unknown consumer_data type"); | |
754 | assert(0); | |
755 | goto end; | |
756 | } | |
757 | DBG("Allocated channel (key %d, shm_fd %d, wait_fd %d, mmap_len %llu, max_sb_size %llu)", | |
00e2e675 | 758 | channel->key, channel->shm_fd, channel->wait_fd, |
3bd1e081 MD |
759 | (unsigned long long) channel->mmap_len, |
760 | (unsigned long long) channel->max_sb_size); | |
761 | end: | |
762 | return channel; | |
763 | } | |
764 | ||
765 | /* | |
766 | * Add a channel to the global list protected by a mutex. | |
767 | */ | |
768 | int consumer_add_channel(struct lttng_consumer_channel *channel) | |
769 | { | |
c77fc10a DG |
770 | struct lttng_ht_node_ulong *node; |
771 | struct lttng_ht_iter iter; | |
772 | ||
3bd1e081 | 773 | pthread_mutex_lock(&consumer_data.lock); |
7ad0a0cb MD |
774 | /* Steal channel identifier, for UST */ |
775 | consumer_steal_channel_key(channel->key); | |
6065ceec | 776 | rcu_read_lock(); |
c77fc10a DG |
777 | |
778 | lttng_ht_lookup(consumer_data.channel_ht, | |
779 | (void *)((unsigned long) channel->key), &iter); | |
780 | node = lttng_ht_iter_get_node_ulong(&iter); | |
781 | if (node != NULL) { | |
782 | /* Channel already exist. Ignore the insertion */ | |
783 | goto end; | |
784 | } | |
785 | ||
04253271 | 786 | lttng_ht_add_unique_ulong(consumer_data.channel_ht, &channel->node); |
c77fc10a DG |
787 | |
788 | end: | |
6065ceec | 789 | rcu_read_unlock(); |
3bd1e081 | 790 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 791 | |
7ad0a0cb | 792 | return 0; |
3bd1e081 MD |
793 | } |
794 | ||
795 | /* | |
796 | * Allocate the pollfd structure and the local view of the out fds to avoid | |
797 | * doing a lookup in the linked list and concurrency issues when writing is | |
798 | * needed. Called with consumer_data.lock held. | |
799 | * | |
800 | * Returns the number of fds in the structures. | |
801 | */ | |
43c34bc3 | 802 | static int consumer_update_poll_array( |
3bd1e081 | 803 | struct lttng_consumer_local_data *ctx, struct pollfd **pollfd, |
43c34bc3 | 804 | struct lttng_consumer_stream **local_stream, struct lttng_ht *ht) |
3bd1e081 | 805 | { |
3bd1e081 | 806 | int i = 0; |
e4421fec DG |
807 | struct lttng_ht_iter iter; |
808 | struct lttng_consumer_stream *stream; | |
3bd1e081 MD |
809 | |
810 | DBG("Updating poll fd array"); | |
481d6c57 | 811 | rcu_read_lock(); |
43c34bc3 | 812 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { |
e4421fec | 813 | if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM) { |
3bd1e081 MD |
814 | continue; |
815 | } | |
e4421fec DG |
816 | DBG("Active FD %d", stream->wait_fd); |
817 | (*pollfd)[i].fd = stream->wait_fd; | |
3bd1e081 | 818 | (*pollfd)[i].events = POLLIN | POLLPRI; |
e4421fec | 819 | local_stream[i] = stream; |
3bd1e081 MD |
820 | i++; |
821 | } | |
481d6c57 | 822 | rcu_read_unlock(); |
3bd1e081 MD |
823 | |
824 | /* | |
825 | * Insert the consumer_poll_pipe at the end of the array and don't | |
826 | * increment i so nb_fd is the number of real FD. | |
827 | */ | |
828 | (*pollfd)[i].fd = ctx->consumer_poll_pipe[0]; | |
509bb1cf | 829 | (*pollfd)[i].events = POLLIN | POLLPRI; |
3bd1e081 MD |
830 | return i; |
831 | } | |
832 | ||
833 | /* | |
834 | * Poll on the should_quit pipe and the command socket return -1 on error and | |
835 | * should exit, 0 if data is available on the command socket | |
836 | */ | |
837 | int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll) | |
838 | { | |
839 | int num_rdy; | |
840 | ||
88f2b785 | 841 | restart: |
3bd1e081 MD |
842 | num_rdy = poll(consumer_sockpoll, 2, -1); |
843 | if (num_rdy == -1) { | |
88f2b785 MD |
844 | /* |
845 | * Restart interrupted system call. | |
846 | */ | |
847 | if (errno == EINTR) { | |
848 | goto restart; | |
849 | } | |
7a57cf92 | 850 | PERROR("Poll error"); |
3bd1e081 MD |
851 | goto exit; |
852 | } | |
509bb1cf | 853 | if (consumer_sockpoll[0].revents & (POLLIN | POLLPRI)) { |
3bd1e081 MD |
854 | DBG("consumer_should_quit wake up"); |
855 | goto exit; | |
856 | } | |
857 | return 0; | |
858 | ||
859 | exit: | |
860 | return -1; | |
861 | } | |
862 | ||
863 | /* | |
864 | * Set the error socket. | |
865 | */ | |
866 | void lttng_consumer_set_error_sock( | |
867 | struct lttng_consumer_local_data *ctx, int sock) | |
868 | { | |
869 | ctx->consumer_error_socket = sock; | |
870 | } | |
871 | ||
872 | /* | |
873 | * Set the command socket path. | |
874 | */ | |
3bd1e081 MD |
875 | void lttng_consumer_set_command_sock_path( |
876 | struct lttng_consumer_local_data *ctx, char *sock) | |
877 | { | |
878 | ctx->consumer_command_sock_path = sock; | |
879 | } | |
880 | ||
881 | /* | |
882 | * Send return code to the session daemon. | |
883 | * If the socket is not defined, we return 0, it is not a fatal error | |
884 | */ | |
885 | int lttng_consumer_send_error( | |
886 | struct lttng_consumer_local_data *ctx, int cmd) | |
887 | { | |
888 | if (ctx->consumer_error_socket > 0) { | |
889 | return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd, | |
890 | sizeof(enum lttcomm_sessiond_command)); | |
891 | } | |
892 | ||
893 | return 0; | |
894 | } | |
895 | ||
896 | /* | |
897 | * Close all the tracefiles and stream fds, should be called when all instances | |
898 | * are destroyed. | |
899 | */ | |
900 | void lttng_consumer_cleanup(void) | |
901 | { | |
e4421fec | 902 | struct lttng_ht_iter iter; |
6065ceec DG |
903 | struct lttng_ht_node_ulong *node; |
904 | ||
905 | rcu_read_lock(); | |
3bd1e081 MD |
906 | |
907 | /* | |
6065ceec DG |
908 | * close all outfd. Called when there are no more threads running (after |
909 | * joining on the threads), no need to protect list iteration with mutex. | |
3bd1e081 | 910 | */ |
6065ceec DG |
911 | cds_lfht_for_each_entry(consumer_data.stream_ht->ht, &iter.iter, node, |
912 | node) { | |
702b1ea4 MD |
913 | struct lttng_consumer_stream *stream = |
914 | caa_container_of(node, struct lttng_consumer_stream, node); | |
e316aad5 | 915 | consumer_del_stream(stream, consumer_data.stream_ht); |
3bd1e081 | 916 | } |
e4421fec | 917 | |
6065ceec DG |
918 | cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, node, |
919 | node) { | |
702b1ea4 MD |
920 | struct lttng_consumer_channel *channel = |
921 | caa_container_of(node, struct lttng_consumer_channel, node); | |
922 | consumer_del_channel(channel); | |
3bd1e081 | 923 | } |
6065ceec DG |
924 | |
925 | rcu_read_unlock(); | |
d6ce1df2 MD |
926 | |
927 | lttng_ht_destroy(consumer_data.stream_ht); | |
928 | lttng_ht_destroy(consumer_data.channel_ht); | |
3bd1e081 MD |
929 | } |
930 | ||
931 | /* | |
932 | * Called from signal handler. | |
933 | */ | |
934 | void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx) | |
935 | { | |
936 | int ret; | |
937 | consumer_quit = 1; | |
6f94560a MD |
938 | do { |
939 | ret = write(ctx->consumer_should_quit[1], "4", 1); | |
940 | } while (ret < 0 && errno == EINTR); | |
3bd1e081 | 941 | if (ret < 0) { |
7a57cf92 | 942 | PERROR("write consumer quit"); |
3bd1e081 MD |
943 | } |
944 | } | |
945 | ||
00e2e675 DG |
946 | void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream, |
947 | off_t orig_offset) | |
3bd1e081 MD |
948 | { |
949 | int outfd = stream->out_fd; | |
950 | ||
951 | /* | |
952 | * This does a blocking write-and-wait on any page that belongs to the | |
953 | * subbuffer prior to the one we just wrote. | |
954 | * Don't care about error values, as these are just hints and ways to | |
955 | * limit the amount of page cache used. | |
956 | */ | |
957 | if (orig_offset < stream->chan->max_sb_size) { | |
958 | return; | |
959 | } | |
b9182dd9 | 960 | lttng_sync_file_range(outfd, orig_offset - stream->chan->max_sb_size, |
3bd1e081 MD |
961 | stream->chan->max_sb_size, |
962 | SYNC_FILE_RANGE_WAIT_BEFORE | |
963 | | SYNC_FILE_RANGE_WRITE | |
964 | | SYNC_FILE_RANGE_WAIT_AFTER); | |
965 | /* | |
966 | * Give hints to the kernel about how we access the file: | |
967 | * POSIX_FADV_DONTNEED : we won't re-access data in a near future after | |
968 | * we write it. | |
969 | * | |
970 | * We need to call fadvise again after the file grows because the | |
971 | * kernel does not seem to apply fadvise to non-existing parts of the | |
972 | * file. | |
973 | * | |
974 | * Call fadvise _after_ having waited for the page writeback to | |
975 | * complete because the dirty page writeback semantic is not well | |
976 | * defined. So it can be expected to lead to lower throughput in | |
977 | * streaming. | |
978 | */ | |
979 | posix_fadvise(outfd, orig_offset - stream->chan->max_sb_size, | |
980 | stream->chan->max_sb_size, POSIX_FADV_DONTNEED); | |
981 | } | |
982 | ||
983 | /* | |
984 | * Initialise the necessary environnement : | |
985 | * - create a new context | |
986 | * - create the poll_pipe | |
987 | * - create the should_quit pipe (for signal handler) | |
988 | * - create the thread pipe (for splice) | |
989 | * | |
990 | * Takes a function pointer as argument, this function is called when data is | |
991 | * available on a buffer. This function is responsible to do the | |
992 | * kernctl_get_next_subbuf, read the data with mmap or splice depending on the | |
993 | * buffer configuration and then kernctl_put_next_subbuf at the end. | |
994 | * | |
995 | * Returns a pointer to the new context or NULL on error. | |
996 | */ | |
997 | struct lttng_consumer_local_data *lttng_consumer_create( | |
998 | enum lttng_consumer_type type, | |
4078b776 | 999 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
d41f73b7 | 1000 | struct lttng_consumer_local_data *ctx), |
3bd1e081 MD |
1001 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
1002 | int (*recv_stream)(struct lttng_consumer_stream *stream), | |
1003 | int (*update_stream)(int stream_key, uint32_t state)) | |
1004 | { | |
1005 | int ret, i; | |
1006 | struct lttng_consumer_local_data *ctx; | |
1007 | ||
1008 | assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN || | |
1009 | consumer_data.type == type); | |
1010 | consumer_data.type = type; | |
1011 | ||
effcf122 | 1012 | ctx = zmalloc(sizeof(struct lttng_consumer_local_data)); |
3bd1e081 | 1013 | if (ctx == NULL) { |
7a57cf92 | 1014 | PERROR("allocating context"); |
3bd1e081 MD |
1015 | goto error; |
1016 | } | |
1017 | ||
1018 | ctx->consumer_error_socket = -1; | |
1019 | /* assign the callbacks */ | |
1020 | ctx->on_buffer_ready = buffer_ready; | |
1021 | ctx->on_recv_channel = recv_channel; | |
1022 | ctx->on_recv_stream = recv_stream; | |
1023 | ctx->on_update_stream = update_stream; | |
1024 | ||
1025 | ret = pipe(ctx->consumer_poll_pipe); | |
1026 | if (ret < 0) { | |
7a57cf92 | 1027 | PERROR("Error creating poll pipe"); |
3bd1e081 MD |
1028 | goto error_poll_pipe; |
1029 | } | |
1030 | ||
04fdd819 MD |
1031 | /* set read end of the pipe to non-blocking */ |
1032 | ret = fcntl(ctx->consumer_poll_pipe[0], F_SETFL, O_NONBLOCK); | |
1033 | if (ret < 0) { | |
7a57cf92 | 1034 | PERROR("fcntl O_NONBLOCK"); |
04fdd819 MD |
1035 | goto error_poll_fcntl; |
1036 | } | |
1037 | ||
1038 | /* set write end of the pipe to non-blocking */ | |
1039 | ret = fcntl(ctx->consumer_poll_pipe[1], F_SETFL, O_NONBLOCK); | |
1040 | if (ret < 0) { | |
7a57cf92 | 1041 | PERROR("fcntl O_NONBLOCK"); |
04fdd819 MD |
1042 | goto error_poll_fcntl; |
1043 | } | |
1044 | ||
3bd1e081 MD |
1045 | ret = pipe(ctx->consumer_should_quit); |
1046 | if (ret < 0) { | |
7a57cf92 | 1047 | PERROR("Error creating recv pipe"); |
3bd1e081 MD |
1048 | goto error_quit_pipe; |
1049 | } | |
1050 | ||
1051 | ret = pipe(ctx->consumer_thread_pipe); | |
1052 | if (ret < 0) { | |
7a57cf92 | 1053 | PERROR("Error creating thread pipe"); |
3bd1e081 MD |
1054 | goto error_thread_pipe; |
1055 | } | |
1056 | ||
fb3a43a9 DG |
1057 | ret = utils_create_pipe(ctx->consumer_metadata_pipe); |
1058 | if (ret < 0) { | |
1059 | goto error_metadata_pipe; | |
1060 | } | |
3bd1e081 | 1061 | |
fb3a43a9 DG |
1062 | ret = utils_create_pipe(ctx->consumer_splice_metadata_pipe); |
1063 | if (ret < 0) { | |
1064 | goto error_splice_pipe; | |
1065 | } | |
1066 | ||
1067 | return ctx; | |
3bd1e081 | 1068 | |
fb3a43a9 DG |
1069 | error_splice_pipe: |
1070 | utils_close_pipe(ctx->consumer_metadata_pipe); | |
1071 | error_metadata_pipe: | |
1072 | utils_close_pipe(ctx->consumer_thread_pipe); | |
3bd1e081 MD |
1073 | error_thread_pipe: |
1074 | for (i = 0; i < 2; i++) { | |
1075 | int err; | |
1076 | ||
1077 | err = close(ctx->consumer_should_quit[i]); | |
4c462e79 MD |
1078 | if (err) { |
1079 | PERROR("close"); | |
1080 | } | |
3bd1e081 | 1081 | } |
04fdd819 | 1082 | error_poll_fcntl: |
3bd1e081 MD |
1083 | error_quit_pipe: |
1084 | for (i = 0; i < 2; i++) { | |
1085 | int err; | |
1086 | ||
1087 | err = close(ctx->consumer_poll_pipe[i]); | |
4c462e79 MD |
1088 | if (err) { |
1089 | PERROR("close"); | |
1090 | } | |
3bd1e081 MD |
1091 | } |
1092 | error_poll_pipe: | |
1093 | free(ctx); | |
1094 | error: | |
1095 | return NULL; | |
1096 | } | |
1097 | ||
1098 | /* | |
1099 | * Close all fds associated with the instance and free the context. | |
1100 | */ | |
1101 | void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx) | |
1102 | { | |
4c462e79 MD |
1103 | int ret; |
1104 | ||
1105 | ret = close(ctx->consumer_error_socket); | |
1106 | if (ret) { | |
1107 | PERROR("close"); | |
1108 | } | |
1109 | ret = close(ctx->consumer_thread_pipe[0]); | |
1110 | if (ret) { | |
1111 | PERROR("close"); | |
1112 | } | |
1113 | ret = close(ctx->consumer_thread_pipe[1]); | |
1114 | if (ret) { | |
1115 | PERROR("close"); | |
1116 | } | |
1117 | ret = close(ctx->consumer_poll_pipe[0]); | |
1118 | if (ret) { | |
1119 | PERROR("close"); | |
1120 | } | |
1121 | ret = close(ctx->consumer_poll_pipe[1]); | |
1122 | if (ret) { | |
1123 | PERROR("close"); | |
1124 | } | |
1125 | ret = close(ctx->consumer_should_quit[0]); | |
1126 | if (ret) { | |
1127 | PERROR("close"); | |
1128 | } | |
1129 | ret = close(ctx->consumer_should_quit[1]); | |
1130 | if (ret) { | |
1131 | PERROR("close"); | |
1132 | } | |
fb3a43a9 DG |
1133 | utils_close_pipe(ctx->consumer_splice_metadata_pipe); |
1134 | ||
3bd1e081 MD |
1135 | unlink(ctx->consumer_command_sock_path); |
1136 | free(ctx); | |
1137 | } | |
1138 | ||
6197aea7 DG |
1139 | /* |
1140 | * Write the metadata stream id on the specified file descriptor. | |
1141 | */ | |
1142 | static int write_relayd_metadata_id(int fd, | |
1143 | struct lttng_consumer_stream *stream, | |
1d4dfdef DG |
1144 | struct consumer_relayd_sock_pair *relayd, |
1145 | unsigned long padding) | |
6197aea7 DG |
1146 | { |
1147 | int ret; | |
1d4dfdef | 1148 | struct lttcomm_relayd_metadata_payload hdr; |
6197aea7 | 1149 | |
1d4dfdef DG |
1150 | hdr.stream_id = htobe64(stream->relayd_stream_id); |
1151 | hdr.padding_size = htobe32(padding); | |
6197aea7 | 1152 | do { |
1d4dfdef | 1153 | ret = write(fd, (void *) &hdr, sizeof(hdr)); |
6197aea7 DG |
1154 | } while (ret < 0 && errno == EINTR); |
1155 | if (ret < 0) { | |
1156 | PERROR("write metadata stream id"); | |
1157 | goto end; | |
1158 | } | |
1d4dfdef DG |
1159 | DBG("Metadata stream id %" PRIu64 " with padding %lu written before data", |
1160 | stream->relayd_stream_id, padding); | |
6197aea7 DG |
1161 | |
1162 | end: | |
1163 | return ret; | |
1164 | } | |
1165 | ||
3bd1e081 | 1166 | /* |
09e26845 DG |
1167 | * Mmap the ring buffer, read it and write the data to the tracefile. This is a |
1168 | * core function for writing trace buffers to either the local filesystem or | |
1169 | * the network. | |
1170 | * | |
1171 | * Careful review MUST be put if any changes occur! | |
3bd1e081 MD |
1172 | * |
1173 | * Returns the number of bytes written | |
1174 | */ | |
4078b776 | 1175 | ssize_t lttng_consumer_on_read_subbuffer_mmap( |
3bd1e081 | 1176 | struct lttng_consumer_local_data *ctx, |
1d4dfdef DG |
1177 | struct lttng_consumer_stream *stream, unsigned long len, |
1178 | unsigned long padding) | |
3bd1e081 | 1179 | { |
f02e1e8a DG |
1180 | unsigned long mmap_offset; |
1181 | ssize_t ret = 0, written = 0; | |
1182 | off_t orig_offset = stream->out_fd_offset; | |
1183 | /* Default is on the disk */ | |
1184 | int outfd = stream->out_fd; | |
f02e1e8a DG |
1185 | struct consumer_relayd_sock_pair *relayd = NULL; |
1186 | ||
1187 | /* RCU lock for the relayd pointer */ | |
1188 | rcu_read_lock(); | |
1189 | ||
1190 | /* Flag that the current stream if set for network streaming. */ | |
1191 | if (stream->net_seq_idx != -1) { | |
1192 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1193 | if (relayd == NULL) { | |
1194 | goto end; | |
1195 | } | |
1196 | } | |
1197 | ||
1198 | /* get the offset inside the fd to mmap */ | |
3bd1e081 MD |
1199 | switch (consumer_data.type) { |
1200 | case LTTNG_CONSUMER_KERNEL: | |
f02e1e8a DG |
1201 | ret = kernctl_get_mmap_read_offset(stream->wait_fd, &mmap_offset); |
1202 | break; | |
7753dea8 MD |
1203 | case LTTNG_CONSUMER32_UST: |
1204 | case LTTNG_CONSUMER64_UST: | |
f02e1e8a DG |
1205 | ret = lttng_ustctl_get_mmap_read_offset(stream->chan->handle, |
1206 | stream->buf, &mmap_offset); | |
1207 | break; | |
3bd1e081 MD |
1208 | default: |
1209 | ERR("Unknown consumer_data type"); | |
1210 | assert(0); | |
1211 | } | |
f02e1e8a DG |
1212 | if (ret != 0) { |
1213 | errno = -ret; | |
1214 | PERROR("tracer ctl get_mmap_read_offset"); | |
1215 | written = ret; | |
1216 | goto end; | |
1217 | } | |
b9182dd9 | 1218 | |
f02e1e8a DG |
1219 | /* Handle stream on the relayd if the output is on the network */ |
1220 | if (relayd) { | |
1221 | unsigned long netlen = len; | |
1222 | ||
1223 | /* | |
1224 | * Lock the control socket for the complete duration of the function | |
1225 | * since from this point on we will use the socket. | |
1226 | */ | |
1227 | if (stream->metadata_flag) { | |
1228 | /* Metadata requires the control socket. */ | |
1229 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1d4dfdef | 1230 | netlen += sizeof(struct lttcomm_relayd_metadata_payload); |
f02e1e8a DG |
1231 | } |
1232 | ||
1d4dfdef | 1233 | ret = write_relayd_stream_header(stream, netlen, padding, relayd); |
f02e1e8a DG |
1234 | if (ret >= 0) { |
1235 | /* Use the returned socket. */ | |
1236 | outfd = ret; | |
1237 | ||
1238 | /* Write metadata stream id before payload */ | |
1239 | if (stream->metadata_flag) { | |
1d4dfdef | 1240 | ret = write_relayd_metadata_id(outfd, stream, relayd, padding); |
f02e1e8a | 1241 | if (ret < 0) { |
f02e1e8a DG |
1242 | written = ret; |
1243 | goto end; | |
1244 | } | |
f02e1e8a DG |
1245 | } |
1246 | } | |
1247 | /* Else, use the default set before which is the filesystem. */ | |
1d4dfdef DG |
1248 | } else { |
1249 | /* No streaming, we have to set the len with the full padding */ | |
1250 | len += padding; | |
f02e1e8a DG |
1251 | } |
1252 | ||
1253 | while (len > 0) { | |
1254 | do { | |
1255 | ret = write(outfd, stream->mmap_base + mmap_offset, len); | |
1256 | } while (ret < 0 && errno == EINTR); | |
1d4dfdef | 1257 | DBG("Consumer mmap write() ret %zd (len %lu)", ret, len); |
f02e1e8a DG |
1258 | if (ret < 0) { |
1259 | PERROR("Error in file write"); | |
1260 | if (written == 0) { | |
1261 | written = ret; | |
1262 | } | |
1263 | goto end; | |
1264 | } else if (ret > len) { | |
77c7c900 | 1265 | PERROR("Error in file write (ret %zd > len %lu)", ret, len); |
f02e1e8a DG |
1266 | written += ret; |
1267 | goto end; | |
1268 | } else { | |
1269 | len -= ret; | |
1270 | mmap_offset += ret; | |
1271 | } | |
f02e1e8a DG |
1272 | |
1273 | /* This call is useless on a socket so better save a syscall. */ | |
1274 | if (!relayd) { | |
1275 | /* This won't block, but will start writeout asynchronously */ | |
1276 | lttng_sync_file_range(outfd, stream->out_fd_offset, ret, | |
1277 | SYNC_FILE_RANGE_WRITE); | |
1278 | stream->out_fd_offset += ret; | |
1279 | } | |
1280 | written += ret; | |
1281 | } | |
1282 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
1283 | ||
1284 | end: | |
1285 | /* Unlock only if ctrl socket used */ | |
1286 | if (relayd && stream->metadata_flag) { | |
1287 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1288 | } | |
1289 | ||
1290 | rcu_read_unlock(); | |
1291 | return written; | |
3bd1e081 MD |
1292 | } |
1293 | ||
1294 | /* | |
1295 | * Splice the data from the ring buffer to the tracefile. | |
1296 | * | |
1297 | * Returns the number of bytes spliced. | |
1298 | */ | |
4078b776 | 1299 | ssize_t lttng_consumer_on_read_subbuffer_splice( |
3bd1e081 | 1300 | struct lttng_consumer_local_data *ctx, |
1d4dfdef DG |
1301 | struct lttng_consumer_stream *stream, unsigned long len, |
1302 | unsigned long padding) | |
3bd1e081 | 1303 | { |
f02e1e8a DG |
1304 | ssize_t ret = 0, written = 0, ret_splice = 0; |
1305 | loff_t offset = 0; | |
1306 | off_t orig_offset = stream->out_fd_offset; | |
1307 | int fd = stream->wait_fd; | |
1308 | /* Default is on the disk */ | |
1309 | int outfd = stream->out_fd; | |
f02e1e8a | 1310 | struct consumer_relayd_sock_pair *relayd = NULL; |
fb3a43a9 | 1311 | int *splice_pipe; |
f02e1e8a | 1312 | |
3bd1e081 MD |
1313 | switch (consumer_data.type) { |
1314 | case LTTNG_CONSUMER_KERNEL: | |
f02e1e8a | 1315 | break; |
7753dea8 MD |
1316 | case LTTNG_CONSUMER32_UST: |
1317 | case LTTNG_CONSUMER64_UST: | |
f02e1e8a | 1318 | /* Not supported for user space tracing */ |
3bd1e081 MD |
1319 | return -ENOSYS; |
1320 | default: | |
1321 | ERR("Unknown consumer_data type"); | |
1322 | assert(0); | |
3bd1e081 MD |
1323 | } |
1324 | ||
f02e1e8a DG |
1325 | /* RCU lock for the relayd pointer */ |
1326 | rcu_read_lock(); | |
1327 | ||
1328 | /* Flag that the current stream if set for network streaming. */ | |
1329 | if (stream->net_seq_idx != -1) { | |
1330 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1331 | if (relayd == NULL) { | |
1332 | goto end; | |
1333 | } | |
1334 | } | |
1335 | ||
fb3a43a9 DG |
1336 | /* |
1337 | * Choose right pipe for splice. Metadata and trace data are handled by | |
1338 | * different threads hence the use of two pipes in order not to race or | |
1339 | * corrupt the written data. | |
1340 | */ | |
1341 | if (stream->metadata_flag) { | |
1342 | splice_pipe = ctx->consumer_splice_metadata_pipe; | |
1343 | } else { | |
1344 | splice_pipe = ctx->consumer_thread_pipe; | |
1345 | } | |
1346 | ||
f02e1e8a | 1347 | /* Write metadata stream id before payload */ |
1d4dfdef DG |
1348 | if (relayd) { |
1349 | int total_len = len; | |
f02e1e8a | 1350 | |
1d4dfdef DG |
1351 | if (stream->metadata_flag) { |
1352 | /* | |
1353 | * Lock the control socket for the complete duration of the function | |
1354 | * since from this point on we will use the socket. | |
1355 | */ | |
1356 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1357 | ||
1358 | ret = write_relayd_metadata_id(splice_pipe[1], stream, relayd, | |
1359 | padding); | |
1360 | if (ret < 0) { | |
1361 | written = ret; | |
1362 | goto end; | |
1363 | } | |
1364 | ||
1365 | total_len += sizeof(struct lttcomm_relayd_metadata_payload); | |
1366 | } | |
1367 | ||
1368 | ret = write_relayd_stream_header(stream, total_len, padding, relayd); | |
1369 | if (ret >= 0) { | |
1370 | /* Use the returned socket. */ | |
1371 | outfd = ret; | |
1372 | } else { | |
1373 | ERR("Remote relayd disconnected. Stopping"); | |
f02e1e8a DG |
1374 | goto end; |
1375 | } | |
1d4dfdef DG |
1376 | } else { |
1377 | /* No streaming, we have to set the len with the full padding */ | |
1378 | len += padding; | |
f02e1e8a DG |
1379 | } |
1380 | ||
1381 | while (len > 0) { | |
1d4dfdef DG |
1382 | DBG("splice chan to pipe offset %lu of len %lu (fd : %d, pipe: %d)", |
1383 | (unsigned long)offset, len, fd, splice_pipe[1]); | |
fb3a43a9 | 1384 | ret_splice = splice(fd, &offset, splice_pipe[1], NULL, len, |
f02e1e8a DG |
1385 | SPLICE_F_MOVE | SPLICE_F_MORE); |
1386 | DBG("splice chan to pipe, ret %zd", ret_splice); | |
1387 | if (ret_splice < 0) { | |
1388 | PERROR("Error in relay splice"); | |
1389 | if (written == 0) { | |
1390 | written = ret_splice; | |
1391 | } | |
1392 | ret = errno; | |
1393 | goto splice_error; | |
1394 | } | |
1395 | ||
1396 | /* Handle stream on the relayd if the output is on the network */ | |
1397 | if (relayd) { | |
1398 | if (stream->metadata_flag) { | |
1d4dfdef DG |
1399 | size_t metadata_payload_size = |
1400 | sizeof(struct lttcomm_relayd_metadata_payload); | |
1401 | ||
f02e1e8a | 1402 | /* Update counter to fit the spliced data */ |
1d4dfdef DG |
1403 | ret_splice += metadata_payload_size; |
1404 | len += metadata_payload_size; | |
f02e1e8a DG |
1405 | /* |
1406 | * We do this so the return value can match the len passed as | |
1407 | * argument to this function. | |
1408 | */ | |
1d4dfdef | 1409 | written -= metadata_payload_size; |
f02e1e8a DG |
1410 | } |
1411 | } | |
1412 | ||
1413 | /* Splice data out */ | |
fb3a43a9 | 1414 | ret_splice = splice(splice_pipe[0], NULL, outfd, NULL, |
f02e1e8a | 1415 | ret_splice, SPLICE_F_MOVE | SPLICE_F_MORE); |
1d4dfdef | 1416 | DBG("Consumer splice pipe to file, ret %zd", ret_splice); |
f02e1e8a DG |
1417 | if (ret_splice < 0) { |
1418 | PERROR("Error in file splice"); | |
1419 | if (written == 0) { | |
1420 | written = ret_splice; | |
1421 | } | |
1422 | ret = errno; | |
1423 | goto splice_error; | |
1424 | } else if (ret_splice > len) { | |
1425 | errno = EINVAL; | |
1426 | PERROR("Wrote more data than requested %zd (len: %lu)", | |
1427 | ret_splice, len); | |
1428 | written += ret_splice; | |
1429 | ret = errno; | |
1430 | goto splice_error; | |
1431 | } | |
1432 | len -= ret_splice; | |
1433 | ||
1434 | /* This call is useless on a socket so better save a syscall. */ | |
1435 | if (!relayd) { | |
1436 | /* This won't block, but will start writeout asynchronously */ | |
1437 | lttng_sync_file_range(outfd, stream->out_fd_offset, ret_splice, | |
1438 | SYNC_FILE_RANGE_WRITE); | |
1439 | stream->out_fd_offset += ret_splice; | |
1440 | } | |
1441 | written += ret_splice; | |
1442 | } | |
1443 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
1444 | ||
1445 | ret = ret_splice; | |
1446 | ||
1447 | goto end; | |
1448 | ||
1449 | splice_error: | |
1450 | /* send the appropriate error description to sessiond */ | |
1451 | switch (ret) { | |
1452 | case EBADF: | |
f73fabfd | 1453 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_EBADF); |
f02e1e8a DG |
1454 | break; |
1455 | case EINVAL: | |
f73fabfd | 1456 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_EINVAL); |
f02e1e8a DG |
1457 | break; |
1458 | case ENOMEM: | |
f73fabfd | 1459 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ENOMEM); |
f02e1e8a DG |
1460 | break; |
1461 | case ESPIPE: | |
f73fabfd | 1462 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ESPIPE); |
f02e1e8a DG |
1463 | break; |
1464 | } | |
1465 | ||
1466 | end: | |
1467 | if (relayd && stream->metadata_flag) { | |
1468 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1469 | } | |
1470 | ||
1471 | rcu_read_unlock(); | |
1472 | return written; | |
3bd1e081 MD |
1473 | } |
1474 | ||
1475 | /* | |
1476 | * Take a snapshot for a specific fd | |
1477 | * | |
1478 | * Returns 0 on success, < 0 on error | |
1479 | */ | |
1480 | int lttng_consumer_take_snapshot(struct lttng_consumer_local_data *ctx, | |
1481 | struct lttng_consumer_stream *stream) | |
1482 | { | |
1483 | switch (consumer_data.type) { | |
1484 | case LTTNG_CONSUMER_KERNEL: | |
1485 | return lttng_kconsumer_take_snapshot(ctx, stream); | |
7753dea8 MD |
1486 | case LTTNG_CONSUMER32_UST: |
1487 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1488 | return lttng_ustconsumer_take_snapshot(ctx, stream); |
1489 | default: | |
1490 | ERR("Unknown consumer_data type"); | |
1491 | assert(0); | |
1492 | return -ENOSYS; | |
1493 | } | |
1494 | ||
1495 | } | |
1496 | ||
1497 | /* | |
1498 | * Get the produced position | |
1499 | * | |
1500 | * Returns 0 on success, < 0 on error | |
1501 | */ | |
1502 | int lttng_consumer_get_produced_snapshot( | |
1503 | struct lttng_consumer_local_data *ctx, | |
1504 | struct lttng_consumer_stream *stream, | |
1505 | unsigned long *pos) | |
1506 | { | |
1507 | switch (consumer_data.type) { | |
1508 | case LTTNG_CONSUMER_KERNEL: | |
1509 | return lttng_kconsumer_get_produced_snapshot(ctx, stream, pos); | |
7753dea8 MD |
1510 | case LTTNG_CONSUMER32_UST: |
1511 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1512 | return lttng_ustconsumer_get_produced_snapshot(ctx, stream, pos); |
1513 | default: | |
1514 | ERR("Unknown consumer_data type"); | |
1515 | assert(0); | |
1516 | return -ENOSYS; | |
1517 | } | |
1518 | } | |
1519 | ||
1520 | int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, | |
1521 | int sock, struct pollfd *consumer_sockpoll) | |
1522 | { | |
1523 | switch (consumer_data.type) { | |
1524 | case LTTNG_CONSUMER_KERNEL: | |
1525 | return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
7753dea8 MD |
1526 | case LTTNG_CONSUMER32_UST: |
1527 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1528 | return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll); |
1529 | default: | |
1530 | ERR("Unknown consumer_data type"); | |
1531 | assert(0); | |
1532 | return -ENOSYS; | |
1533 | } | |
1534 | } | |
1535 | ||
43c34bc3 DG |
1536 | /* |
1537 | * Iterate over all streams of the hashtable and free them properly. | |
1538 | * | |
1539 | * WARNING: *MUST* be used with data stream only. | |
1540 | */ | |
1541 | static void destroy_data_stream_ht(struct lttng_ht *ht) | |
1542 | { | |
1543 | int ret; | |
1544 | struct lttng_ht_iter iter; | |
1545 | struct lttng_consumer_stream *stream; | |
1546 | ||
1547 | if (ht == NULL) { | |
1548 | return; | |
1549 | } | |
1550 | ||
1551 | rcu_read_lock(); | |
1552 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { | |
1553 | ret = lttng_ht_del(ht, &iter); | |
1554 | assert(!ret); | |
1555 | ||
1556 | call_rcu(&stream->node.head, consumer_free_stream); | |
1557 | } | |
1558 | rcu_read_unlock(); | |
1559 | ||
1560 | lttng_ht_destroy(ht); | |
1561 | } | |
1562 | ||
fb3a43a9 | 1563 | /* |
f724d81e | 1564 | * Iterate over all streams of the hashtable and free them properly. |
e316aad5 DG |
1565 | * |
1566 | * XXX: Should not be only for metadata stream or else use an other name. | |
fb3a43a9 DG |
1567 | */ |
1568 | static void destroy_stream_ht(struct lttng_ht *ht) | |
1569 | { | |
1570 | int ret; | |
1571 | struct lttng_ht_iter iter; | |
1572 | struct lttng_consumer_stream *stream; | |
1573 | ||
1574 | if (ht == NULL) { | |
1575 | return; | |
1576 | } | |
1577 | ||
d09e1200 | 1578 | rcu_read_lock(); |
e316aad5 | 1579 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, waitfd_node.node) { |
fb3a43a9 DG |
1580 | ret = lttng_ht_del(ht, &iter); |
1581 | assert(!ret); | |
1582 | ||
e316aad5 | 1583 | call_rcu(&stream->waitfd_node.head, consumer_free_metadata_stream); |
fb3a43a9 | 1584 | } |
d09e1200 | 1585 | rcu_read_unlock(); |
fb3a43a9 DG |
1586 | |
1587 | lttng_ht_destroy(ht); | |
1588 | } | |
1589 | ||
1590 | /* | |
1591 | * Clean up a metadata stream and free its memory. | |
1592 | */ | |
e316aad5 DG |
1593 | void consumer_del_metadata_stream(struct lttng_consumer_stream *stream, |
1594 | struct lttng_ht *ht) | |
fb3a43a9 DG |
1595 | { |
1596 | int ret; | |
e316aad5 DG |
1597 | struct lttng_ht_iter iter; |
1598 | struct lttng_consumer_channel *free_chan = NULL; | |
fb3a43a9 DG |
1599 | struct consumer_relayd_sock_pair *relayd; |
1600 | ||
1601 | assert(stream); | |
1602 | /* | |
1603 | * This call should NEVER receive regular stream. It must always be | |
1604 | * metadata stream and this is crucial for data structure synchronization. | |
1605 | */ | |
1606 | assert(stream->metadata_flag); | |
1607 | ||
e316aad5 DG |
1608 | DBG3("Consumer delete metadata stream %d", stream->wait_fd); |
1609 | ||
1610 | if (ht == NULL) { | |
1611 | /* Means the stream was allocated but not successfully added */ | |
1612 | goto free_stream; | |
1613 | } | |
1614 | ||
fb3a43a9 DG |
1615 | pthread_mutex_lock(&consumer_data.lock); |
1616 | switch (consumer_data.type) { | |
1617 | case LTTNG_CONSUMER_KERNEL: | |
1618 | if (stream->mmap_base != NULL) { | |
1619 | ret = munmap(stream->mmap_base, stream->mmap_len); | |
1620 | if (ret != 0) { | |
1621 | PERROR("munmap metadata stream"); | |
1622 | } | |
1623 | } | |
1624 | break; | |
1625 | case LTTNG_CONSUMER32_UST: | |
1626 | case LTTNG_CONSUMER64_UST: | |
1627 | lttng_ustconsumer_del_stream(stream); | |
1628 | break; | |
1629 | default: | |
1630 | ERR("Unknown consumer_data type"); | |
1631 | assert(0); | |
e316aad5 | 1632 | goto end; |
fb3a43a9 | 1633 | } |
fb3a43a9 | 1634 | |
c869f647 DG |
1635 | rcu_read_lock(); |
1636 | iter.iter.node = &stream->waitfd_node.node; | |
1637 | ret = lttng_ht_del(ht, &iter); | |
1638 | assert(!ret); | |
1639 | rcu_read_unlock(); | |
1640 | ||
fb3a43a9 DG |
1641 | if (stream->out_fd >= 0) { |
1642 | ret = close(stream->out_fd); | |
1643 | if (ret) { | |
1644 | PERROR("close"); | |
1645 | } | |
1646 | } | |
1647 | ||
1648 | if (stream->wait_fd >= 0 && !stream->wait_fd_is_copy) { | |
1649 | ret = close(stream->wait_fd); | |
1650 | if (ret) { | |
1651 | PERROR("close"); | |
1652 | } | |
1653 | } | |
1654 | ||
1655 | if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) { | |
1656 | ret = close(stream->shm_fd); | |
1657 | if (ret) { | |
1658 | PERROR("close"); | |
1659 | } | |
1660 | } | |
1661 | ||
1662 | /* Check and cleanup relayd */ | |
1663 | rcu_read_lock(); | |
1664 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1665 | if (relayd != NULL) { | |
1666 | uatomic_dec(&relayd->refcount); | |
1667 | assert(uatomic_read(&relayd->refcount) >= 0); | |
1668 | ||
1669 | /* Closing streams requires to lock the control socket. */ | |
1670 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1671 | ret = relayd_send_close_stream(&relayd->control_sock, | |
1672 | stream->relayd_stream_id, stream->next_net_seq_num - 1); | |
1673 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1674 | if (ret < 0) { | |
1675 | DBG("Unable to close stream on the relayd. Continuing"); | |
1676 | /* | |
1677 | * Continue here. There is nothing we can do for the relayd. | |
1678 | * Chances are that the relayd has closed the socket so we just | |
1679 | * continue cleaning up. | |
1680 | */ | |
1681 | } | |
1682 | ||
1683 | /* Both conditions are met, we destroy the relayd. */ | |
1684 | if (uatomic_read(&relayd->refcount) == 0 && | |
1685 | uatomic_read(&relayd->destroy_flag)) { | |
d09e1200 | 1686 | destroy_relayd(relayd); |
fb3a43a9 DG |
1687 | } |
1688 | } | |
1689 | rcu_read_unlock(); | |
1690 | ||
1691 | /* Atomically decrement channel refcount since other threads can use it. */ | |
1692 | uatomic_dec(&stream->chan->refcount); | |
c30aaa51 MD |
1693 | if (!uatomic_read(&stream->chan->refcount) |
1694 | && !uatomic_read(&stream->chan->nb_init_streams)) { | |
1695 | /* Go for channel deletion! */ | |
e316aad5 | 1696 | free_chan = stream->chan; |
fb3a43a9 DG |
1697 | } |
1698 | ||
e316aad5 DG |
1699 | end: |
1700 | pthread_mutex_unlock(&consumer_data.lock); | |
1701 | ||
1702 | if (free_chan) { | |
1703 | consumer_del_channel(free_chan); | |
1704 | } | |
1705 | ||
1706 | free_stream: | |
1707 | call_rcu(&stream->waitfd_node.head, consumer_free_metadata_stream); | |
fb3a43a9 DG |
1708 | } |
1709 | ||
1710 | /* | |
1711 | * Action done with the metadata stream when adding it to the consumer internal | |
1712 | * data structures to handle it. | |
1713 | */ | |
e316aad5 DG |
1714 | static int consumer_add_metadata_stream(struct lttng_consumer_stream *stream, |
1715 | struct lttng_ht *ht) | |
fb3a43a9 | 1716 | { |
e316aad5 | 1717 | int ret = 0; |
fb3a43a9 DG |
1718 | struct consumer_relayd_sock_pair *relayd; |
1719 | ||
e316aad5 DG |
1720 | assert(stream); |
1721 | assert(ht); | |
1722 | ||
1723 | DBG3("Adding metadata stream %d to hash table", stream->wait_fd); | |
1724 | ||
1725 | pthread_mutex_lock(&consumer_data.lock); | |
1726 | ||
e316aad5 DG |
1727 | /* |
1728 | * From here, refcounts are updated so be _careful_ when returning an error | |
1729 | * after this point. | |
1730 | */ | |
1731 | ||
fb3a43a9 | 1732 | rcu_read_lock(); |
e316aad5 | 1733 | /* Find relayd and, if one is found, increment refcount. */ |
fb3a43a9 DG |
1734 | relayd = consumer_find_relayd(stream->net_seq_idx); |
1735 | if (relayd != NULL) { | |
1736 | uatomic_inc(&relayd->refcount); | |
1737 | } | |
e316aad5 DG |
1738 | |
1739 | /* Update channel refcount once added without error(s). */ | |
1740 | uatomic_inc(&stream->chan->refcount); | |
1741 | ||
1742 | /* | |
1743 | * When nb_init_streams reaches 0, we don't need to trigger any action in | |
1744 | * terms of destroying the associated channel, because the action that | |
1745 | * causes the count to become 0 also causes a stream to be added. The | |
1746 | * channel deletion will thus be triggered by the following removal of this | |
1747 | * stream. | |
1748 | */ | |
1749 | if (uatomic_read(&stream->chan->nb_init_streams) > 0) { | |
1750 | uatomic_dec(&stream->chan->nb_init_streams); | |
1751 | } | |
1752 | ||
43c34bc3 DG |
1753 | /* Steal stream identifier to avoid having streams with the same key */ |
1754 | consumer_steal_stream_key(stream->key, ht); | |
1755 | ||
e316aad5 | 1756 | lttng_ht_add_unique_ulong(ht, &stream->waitfd_node); |
fb3a43a9 | 1757 | rcu_read_unlock(); |
e316aad5 | 1758 | |
e316aad5 DG |
1759 | pthread_mutex_unlock(&consumer_data.lock); |
1760 | return ret; | |
fb3a43a9 DG |
1761 | } |
1762 | ||
1763 | /* | |
1764 | * Thread polls on metadata file descriptor and write them on disk or on the | |
1765 | * network. | |
1766 | */ | |
7d980def | 1767 | void *consumer_thread_metadata_poll(void *data) |
fb3a43a9 DG |
1768 | { |
1769 | int ret, i, pollfd; | |
1770 | uint32_t revents, nb_fd; | |
e316aad5 | 1771 | struct lttng_consumer_stream *stream = NULL; |
fb3a43a9 DG |
1772 | struct lttng_ht_iter iter; |
1773 | struct lttng_ht_node_ulong *node; | |
fb3a43a9 DG |
1774 | struct lttng_poll_event events; |
1775 | struct lttng_consumer_local_data *ctx = data; | |
1776 | ssize_t len; | |
1777 | ||
1778 | rcu_register_thread(); | |
1779 | ||
1780 | DBG("Thread metadata poll started"); | |
1781 | ||
fb3a43a9 DG |
1782 | /* Size is set to 1 for the consumer_metadata pipe */ |
1783 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
1784 | if (ret < 0) { | |
1785 | ERR("Poll set creation failed"); | |
1786 | goto end; | |
1787 | } | |
1788 | ||
1789 | ret = lttng_poll_add(&events, ctx->consumer_metadata_pipe[0], LPOLLIN); | |
1790 | if (ret < 0) { | |
1791 | goto end; | |
1792 | } | |
1793 | ||
1794 | /* Main loop */ | |
1795 | DBG("Metadata main loop started"); | |
1796 | ||
1797 | while (1) { | |
1798 | lttng_poll_reset(&events); | |
1799 | ||
1800 | nb_fd = LTTNG_POLL_GETNB(&events); | |
1801 | ||
1802 | /* Only the metadata pipe is set */ | |
1803 | if (nb_fd == 0 && consumer_quit == 1) { | |
1804 | goto end; | |
1805 | } | |
1806 | ||
1807 | restart: | |
1808 | DBG("Metadata poll wait with %d fd(s)", nb_fd); | |
1809 | ret = lttng_poll_wait(&events, -1); | |
1810 | DBG("Metadata event catched in thread"); | |
1811 | if (ret < 0) { | |
1812 | if (errno == EINTR) { | |
e316aad5 | 1813 | ERR("Poll EINTR catched"); |
fb3a43a9 DG |
1814 | goto restart; |
1815 | } | |
1816 | goto error; | |
1817 | } | |
1818 | ||
e316aad5 | 1819 | /* From here, the event is a metadata wait fd */ |
fb3a43a9 DG |
1820 | for (i = 0; i < nb_fd; i++) { |
1821 | revents = LTTNG_POLL_GETEV(&events, i); | |
1822 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1823 | ||
e316aad5 DG |
1824 | /* Just don't waste time if no returned events for the fd */ |
1825 | if (!revents) { | |
1826 | continue; | |
1827 | } | |
1828 | ||
fb3a43a9 | 1829 | if (pollfd == ctx->consumer_metadata_pipe[0]) { |
4adabd61 | 1830 | if (revents & (LPOLLERR | LPOLLHUP )) { |
fb3a43a9 DG |
1831 | DBG("Metadata thread pipe hung up"); |
1832 | /* | |
1833 | * Remove the pipe from the poll set and continue the loop | |
1834 | * since their might be data to consume. | |
1835 | */ | |
1836 | lttng_poll_del(&events, ctx->consumer_metadata_pipe[0]); | |
1837 | close(ctx->consumer_metadata_pipe[0]); | |
1838 | continue; | |
1839 | } else if (revents & LPOLLIN) { | |
fb3a43a9 | 1840 | do { |
633d0084 DG |
1841 | /* Get the stream pointer received */ |
1842 | ret = read(pollfd, &stream, sizeof(stream)); | |
fb3a43a9 | 1843 | } while (ret < 0 && errno == EINTR); |
633d0084 DG |
1844 | if (ret < 0 || |
1845 | ret < sizeof(struct lttng_consumer_stream *)) { | |
fb3a43a9 | 1846 | PERROR("read metadata stream"); |
fb3a43a9 DG |
1847 | /* |
1848 | * Let's continue here and hope we can still work | |
1849 | * without stopping the consumer. XXX: Should we? | |
1850 | */ | |
1851 | continue; | |
1852 | } | |
1853 | ||
1854 | DBG("Adding metadata stream %d to poll set", | |
1855 | stream->wait_fd); | |
1856 | ||
e316aad5 DG |
1857 | ret = consumer_add_metadata_stream(stream, metadata_ht); |
1858 | if (ret) { | |
1859 | ERR("Unable to add metadata stream"); | |
1860 | /* Stream was not setup properly. Continuing. */ | |
1861 | consumer_del_metadata_stream(stream, NULL); | |
1862 | continue; | |
1863 | } | |
fb3a43a9 DG |
1864 | |
1865 | /* Add metadata stream to the global poll events list */ | |
1866 | lttng_poll_add(&events, stream->wait_fd, | |
1867 | LPOLLIN | LPOLLPRI); | |
fb3a43a9 DG |
1868 | } |
1869 | ||
e316aad5 | 1870 | /* Handle other stream */ |
fb3a43a9 DG |
1871 | continue; |
1872 | } | |
1873 | ||
d09e1200 | 1874 | rcu_read_lock(); |
fb3a43a9 DG |
1875 | lttng_ht_lookup(metadata_ht, (void *)((unsigned long) pollfd), |
1876 | &iter); | |
1877 | node = lttng_ht_iter_get_node_ulong(&iter); | |
e316aad5 | 1878 | assert(node); |
fb3a43a9 DG |
1879 | |
1880 | stream = caa_container_of(node, struct lttng_consumer_stream, | |
1881 | waitfd_node); | |
1882 | ||
e316aad5 | 1883 | /* Check for error event */ |
4adabd61 | 1884 | if (revents & (LPOLLERR | LPOLLHUP)) { |
e316aad5 | 1885 | DBG("Metadata fd %d is hup|err.", pollfd); |
fb3a43a9 DG |
1886 | if (!stream->hangup_flush_done |
1887 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
1888 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
1889 | DBG("Attempting to flush and consume the UST buffers"); | |
1890 | lttng_ustconsumer_on_stream_hangup(stream); | |
1891 | ||
1892 | /* We just flushed the stream now read it. */ | |
4bb94b75 DG |
1893 | do { |
1894 | len = ctx->on_buffer_ready(stream, ctx); | |
1895 | /* | |
1896 | * We don't check the return value here since if we get | |
1897 | * a negative len, it means an error occured thus we | |
1898 | * simply remove it from the poll set and free the | |
1899 | * stream. | |
1900 | */ | |
1901 | } while (len > 0); | |
fb3a43a9 DG |
1902 | } |
1903 | ||
fb3a43a9 | 1904 | lttng_poll_del(&events, stream->wait_fd); |
e316aad5 DG |
1905 | /* |
1906 | * This call update the channel states, closes file descriptors | |
1907 | * and securely free the stream. | |
1908 | */ | |
1909 | consumer_del_metadata_stream(stream, metadata_ht); | |
1910 | } else if (revents & (LPOLLIN | LPOLLPRI)) { | |
1911 | /* Get the data out of the metadata file descriptor */ | |
1912 | DBG("Metadata available on fd %d", pollfd); | |
1913 | assert(stream->wait_fd == pollfd); | |
1914 | ||
1915 | len = ctx->on_buffer_ready(stream, ctx); | |
1916 | /* It's ok to have an unavailable sub-buffer */ | |
b64403e3 | 1917 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
e316aad5 DG |
1918 | rcu_read_unlock(); |
1919 | goto end; | |
1920 | } else if (len > 0) { | |
1921 | stream->data_read = 1; | |
1922 | } | |
fb3a43a9 | 1923 | } |
e316aad5 DG |
1924 | |
1925 | /* Release RCU lock for the stream looked up */ | |
d09e1200 | 1926 | rcu_read_unlock(); |
fb3a43a9 DG |
1927 | } |
1928 | } | |
1929 | ||
1930 | error: | |
1931 | end: | |
1932 | DBG("Metadata poll thread exiting"); | |
1933 | lttng_poll_clean(&events); | |
1934 | ||
1935 | if (metadata_ht) { | |
1936 | destroy_stream_ht(metadata_ht); | |
1937 | } | |
1938 | ||
1939 | rcu_unregister_thread(); | |
1940 | return NULL; | |
1941 | } | |
1942 | ||
3bd1e081 | 1943 | /* |
e4421fec | 1944 | * This thread polls the fds in the set to consume the data and write |
3bd1e081 MD |
1945 | * it to tracefile if necessary. |
1946 | */ | |
7d980def | 1947 | void *consumer_thread_data_poll(void *data) |
3bd1e081 MD |
1948 | { |
1949 | int num_rdy, num_hup, high_prio, ret, i; | |
1950 | struct pollfd *pollfd = NULL; | |
1951 | /* local view of the streams */ | |
c869f647 | 1952 | struct lttng_consumer_stream **local_stream = NULL, *new_stream = NULL; |
3bd1e081 MD |
1953 | /* local view of consumer_data.fds_count */ |
1954 | int nb_fd = 0; | |
3bd1e081 | 1955 | struct lttng_consumer_local_data *ctx = data; |
00e2e675 | 1956 | ssize_t len; |
3bd1e081 | 1957 | |
e7b994a3 DG |
1958 | rcu_register_thread(); |
1959 | ||
43c34bc3 DG |
1960 | data_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1961 | if (data_ht == NULL) { | |
1962 | goto end; | |
1963 | } | |
1964 | ||
effcf122 | 1965 | local_stream = zmalloc(sizeof(struct lttng_consumer_stream)); |
3bd1e081 MD |
1966 | |
1967 | while (1) { | |
1968 | high_prio = 0; | |
1969 | num_hup = 0; | |
1970 | ||
1971 | /* | |
e4421fec | 1972 | * the fds set has been updated, we need to update our |
3bd1e081 MD |
1973 | * local array as well |
1974 | */ | |
1975 | pthread_mutex_lock(&consumer_data.lock); | |
1976 | if (consumer_data.need_update) { | |
1977 | if (pollfd != NULL) { | |
1978 | free(pollfd); | |
1979 | pollfd = NULL; | |
1980 | } | |
1981 | if (local_stream != NULL) { | |
1982 | free(local_stream); | |
1983 | local_stream = NULL; | |
1984 | } | |
1985 | ||
1986 | /* allocate for all fds + 1 for the consumer_poll_pipe */ | |
effcf122 | 1987 | pollfd = zmalloc((consumer_data.stream_count + 1) * sizeof(struct pollfd)); |
3bd1e081 | 1988 | if (pollfd == NULL) { |
7a57cf92 | 1989 | PERROR("pollfd malloc"); |
3bd1e081 MD |
1990 | pthread_mutex_unlock(&consumer_data.lock); |
1991 | goto end; | |
1992 | } | |
1993 | ||
1994 | /* allocate for all fds + 1 for the consumer_poll_pipe */ | |
effcf122 | 1995 | local_stream = zmalloc((consumer_data.stream_count + 1) * |
3bd1e081 MD |
1996 | sizeof(struct lttng_consumer_stream)); |
1997 | if (local_stream == NULL) { | |
7a57cf92 | 1998 | PERROR("local_stream malloc"); |
3bd1e081 MD |
1999 | pthread_mutex_unlock(&consumer_data.lock); |
2000 | goto end; | |
2001 | } | |
43c34bc3 DG |
2002 | ret = consumer_update_poll_array(ctx, &pollfd, local_stream, |
2003 | data_ht); | |
3bd1e081 MD |
2004 | if (ret < 0) { |
2005 | ERR("Error in allocating pollfd or local_outfds"); | |
f73fabfd | 2006 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
2007 | pthread_mutex_unlock(&consumer_data.lock); |
2008 | goto end; | |
2009 | } | |
2010 | nb_fd = ret; | |
2011 | consumer_data.need_update = 0; | |
2012 | } | |
2013 | pthread_mutex_unlock(&consumer_data.lock); | |
2014 | ||
4078b776 MD |
2015 | /* No FDs and consumer_quit, consumer_cleanup the thread */ |
2016 | if (nb_fd == 0 && consumer_quit == 1) { | |
2017 | goto end; | |
2018 | } | |
3bd1e081 | 2019 | /* poll on the array of fds */ |
88f2b785 | 2020 | restart: |
3bd1e081 MD |
2021 | DBG("polling on %d fd", nb_fd + 1); |
2022 | num_rdy = poll(pollfd, nb_fd + 1, consumer_poll_timeout); | |
2023 | DBG("poll num_rdy : %d", num_rdy); | |
2024 | if (num_rdy == -1) { | |
88f2b785 MD |
2025 | /* |
2026 | * Restart interrupted system call. | |
2027 | */ | |
2028 | if (errno == EINTR) { | |
2029 | goto restart; | |
2030 | } | |
7a57cf92 | 2031 | PERROR("Poll error"); |
f73fabfd | 2032 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
2033 | goto end; |
2034 | } else if (num_rdy == 0) { | |
2035 | DBG("Polling thread timed out"); | |
2036 | goto end; | |
2037 | } | |
2038 | ||
3bd1e081 | 2039 | /* |
00e2e675 DG |
2040 | * If the consumer_poll_pipe triggered poll go directly to the |
2041 | * beginning of the loop to update the array. We want to prioritize | |
2042 | * array update over low-priority reads. | |
3bd1e081 | 2043 | */ |
509bb1cf | 2044 | if (pollfd[nb_fd].revents & (POLLIN | POLLPRI)) { |
04fdd819 | 2045 | size_t pipe_readlen; |
04fdd819 | 2046 | |
3bd1e081 | 2047 | DBG("consumer_poll_pipe wake up"); |
04fdd819 MD |
2048 | /* Consume 1 byte of pipe data */ |
2049 | do { | |
c869f647 DG |
2050 | pipe_readlen = read(ctx->consumer_poll_pipe[0], &new_stream, |
2051 | sizeof(new_stream)); | |
04fdd819 | 2052 | } while (pipe_readlen == -1 && errno == EINTR); |
c869f647 DG |
2053 | |
2054 | /* | |
2055 | * If the stream is NULL, just ignore it. It's also possible that | |
2056 | * the sessiond poll thread changed the consumer_quit state and is | |
2057 | * waking us up to test it. | |
2058 | */ | |
2059 | if (new_stream == NULL) { | |
2060 | continue; | |
2061 | } | |
2062 | ||
43c34bc3 | 2063 | ret = consumer_add_stream(new_stream, data_ht); |
c869f647 DG |
2064 | if (ret) { |
2065 | ERR("Consumer add stream %d failed. Continuing", | |
2066 | new_stream->key); | |
2067 | /* | |
2068 | * At this point, if the add_stream fails, it is not in the | |
2069 | * hash table thus passing the NULL value here. | |
2070 | */ | |
2071 | consumer_del_stream(new_stream, NULL); | |
2072 | } | |
2073 | ||
2074 | /* Continue to update the local streams and handle prio ones */ | |
3bd1e081 MD |
2075 | continue; |
2076 | } | |
2077 | ||
2078 | /* Take care of high priority channels first. */ | |
2079 | for (i = 0; i < nb_fd; i++) { | |
fb3a43a9 | 2080 | if (pollfd[i].revents & POLLPRI) { |
d41f73b7 MD |
2081 | DBG("Urgent read on fd %d", pollfd[i].fd); |
2082 | high_prio = 1; | |
4078b776 | 2083 | len = ctx->on_buffer_ready(local_stream[i], ctx); |
d41f73b7 | 2084 | /* it's ok to have an unavailable sub-buffer */ |
b64403e3 | 2085 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
4078b776 MD |
2086 | goto end; |
2087 | } else if (len > 0) { | |
2088 | local_stream[i]->data_read = 1; | |
d41f73b7 | 2089 | } |
3bd1e081 MD |
2090 | } |
2091 | } | |
2092 | ||
4078b776 MD |
2093 | /* |
2094 | * If we read high prio channel in this loop, try again | |
2095 | * for more high prio data. | |
2096 | */ | |
2097 | if (high_prio) { | |
3bd1e081 MD |
2098 | continue; |
2099 | } | |
2100 | ||
2101 | /* Take care of low priority channels. */ | |
4078b776 MD |
2102 | for (i = 0; i < nb_fd; i++) { |
2103 | if ((pollfd[i].revents & POLLIN) || | |
2104 | local_stream[i]->hangup_flush_done) { | |
4078b776 MD |
2105 | DBG("Normal read on fd %d", pollfd[i].fd); |
2106 | len = ctx->on_buffer_ready(local_stream[i], ctx); | |
2107 | /* it's ok to have an unavailable sub-buffer */ | |
b64403e3 | 2108 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
4078b776 MD |
2109 | goto end; |
2110 | } else if (len > 0) { | |
2111 | local_stream[i]->data_read = 1; | |
2112 | } | |
2113 | } | |
2114 | } | |
2115 | ||
2116 | /* Handle hangup and errors */ | |
2117 | for (i = 0; i < nb_fd; i++) { | |
2118 | if (!local_stream[i]->hangup_flush_done | |
2119 | && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL)) | |
2120 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
2121 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
2122 | DBG("fd %d is hup|err|nval. Attempting flush and read.", | |
2123 | pollfd[i].fd); | |
2124 | lttng_ustconsumer_on_stream_hangup(local_stream[i]); | |
2125 | /* Attempt read again, for the data we just flushed. */ | |
2126 | local_stream[i]->data_read = 1; | |
2127 | } | |
2128 | /* | |
2129 | * If the poll flag is HUP/ERR/NVAL and we have | |
2130 | * read no data in this pass, we can remove the | |
2131 | * stream from its hash table. | |
2132 | */ | |
2133 | if ((pollfd[i].revents & POLLHUP)) { | |
2134 | DBG("Polling fd %d tells it has hung up.", pollfd[i].fd); | |
2135 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2136 | consumer_del_stream(local_stream[i], data_ht); |
4078b776 MD |
2137 | num_hup++; |
2138 | } | |
2139 | } else if (pollfd[i].revents & POLLERR) { | |
2140 | ERR("Error returned in polling fd %d.", pollfd[i].fd); | |
2141 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2142 | consumer_del_stream(local_stream[i], data_ht); |
4078b776 MD |
2143 | num_hup++; |
2144 | } | |
2145 | } else if (pollfd[i].revents & POLLNVAL) { | |
2146 | ERR("Polling fd %d tells fd is not open.", pollfd[i].fd); | |
2147 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2148 | consumer_del_stream(local_stream[i], data_ht); |
4078b776 | 2149 | num_hup++; |
3bd1e081 MD |
2150 | } |
2151 | } | |
4078b776 | 2152 | local_stream[i]->data_read = 0; |
3bd1e081 MD |
2153 | } |
2154 | } | |
2155 | end: | |
2156 | DBG("polling thread exiting"); | |
2157 | if (pollfd != NULL) { | |
2158 | free(pollfd); | |
2159 | pollfd = NULL; | |
2160 | } | |
2161 | if (local_stream != NULL) { | |
2162 | free(local_stream); | |
2163 | local_stream = NULL; | |
2164 | } | |
fb3a43a9 DG |
2165 | |
2166 | /* | |
2167 | * Close the write side of the pipe so epoll_wait() in | |
7d980def DG |
2168 | * consumer_thread_metadata_poll can catch it. The thread is monitoring the |
2169 | * read side of the pipe. If we close them both, epoll_wait strangely does | |
2170 | * not return and could create a endless wait period if the pipe is the | |
2171 | * only tracked fd in the poll set. The thread will take care of closing | |
2172 | * the read side. | |
fb3a43a9 DG |
2173 | */ |
2174 | close(ctx->consumer_metadata_pipe[1]); | |
fb3a43a9 | 2175 | |
43c34bc3 DG |
2176 | if (data_ht) { |
2177 | destroy_data_stream_ht(data_ht); | |
2178 | } | |
2179 | ||
e7b994a3 | 2180 | rcu_unregister_thread(); |
3bd1e081 MD |
2181 | return NULL; |
2182 | } | |
2183 | ||
2184 | /* | |
2185 | * This thread listens on the consumerd socket and receives the file | |
2186 | * descriptors from the session daemon. | |
2187 | */ | |
7d980def | 2188 | void *consumer_thread_sessiond_poll(void *data) |
3bd1e081 MD |
2189 | { |
2190 | int sock, client_socket, ret; | |
2191 | /* | |
2192 | * structure to poll for incoming data on communication socket avoids | |
2193 | * making blocking sockets. | |
2194 | */ | |
2195 | struct pollfd consumer_sockpoll[2]; | |
2196 | struct lttng_consumer_local_data *ctx = data; | |
2197 | ||
e7b994a3 DG |
2198 | rcu_register_thread(); |
2199 | ||
3bd1e081 MD |
2200 | DBG("Creating command socket %s", ctx->consumer_command_sock_path); |
2201 | unlink(ctx->consumer_command_sock_path); | |
2202 | client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path); | |
2203 | if (client_socket < 0) { | |
2204 | ERR("Cannot create command socket"); | |
2205 | goto end; | |
2206 | } | |
2207 | ||
2208 | ret = lttcomm_listen_unix_sock(client_socket); | |
2209 | if (ret < 0) { | |
2210 | goto end; | |
2211 | } | |
2212 | ||
32258573 | 2213 | DBG("Sending ready command to lttng-sessiond"); |
f73fabfd | 2214 | ret = lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_COMMAND_SOCK_READY); |
3bd1e081 MD |
2215 | /* return < 0 on error, but == 0 is not fatal */ |
2216 | if (ret < 0) { | |
32258573 | 2217 | ERR("Error sending ready command to lttng-sessiond"); |
3bd1e081 MD |
2218 | goto end; |
2219 | } | |
2220 | ||
2221 | ret = fcntl(client_socket, F_SETFL, O_NONBLOCK); | |
2222 | if (ret < 0) { | |
7a57cf92 | 2223 | PERROR("fcntl O_NONBLOCK"); |
3bd1e081 MD |
2224 | goto end; |
2225 | } | |
2226 | ||
2227 | /* prepare the FDs to poll : to client socket and the should_quit pipe */ | |
2228 | consumer_sockpoll[0].fd = ctx->consumer_should_quit[0]; | |
2229 | consumer_sockpoll[0].events = POLLIN | POLLPRI; | |
2230 | consumer_sockpoll[1].fd = client_socket; | |
2231 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
2232 | ||
2233 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2234 | goto end; | |
2235 | } | |
2236 | DBG("Connection on client_socket"); | |
2237 | ||
2238 | /* Blocking call, waiting for transmission */ | |
2239 | sock = lttcomm_accept_unix_sock(client_socket); | |
2240 | if (sock <= 0) { | |
2241 | WARN("On accept"); | |
2242 | goto end; | |
2243 | } | |
2244 | ret = fcntl(sock, F_SETFL, O_NONBLOCK); | |
2245 | if (ret < 0) { | |
7a57cf92 | 2246 | PERROR("fcntl O_NONBLOCK"); |
3bd1e081 MD |
2247 | goto end; |
2248 | } | |
2249 | ||
2250 | /* update the polling structure to poll on the established socket */ | |
2251 | consumer_sockpoll[1].fd = sock; | |
2252 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
2253 | ||
2254 | while (1) { | |
2255 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2256 | goto end; | |
2257 | } | |
2258 | DBG("Incoming command on sock"); | |
2259 | ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
2260 | if (ret == -ENOENT) { | |
2261 | DBG("Received STOP command"); | |
2262 | goto end; | |
2263 | } | |
4cbc1a04 DG |
2264 | if (ret <= 0) { |
2265 | /* | |
2266 | * This could simply be a session daemon quitting. Don't output | |
2267 | * ERR() here. | |
2268 | */ | |
2269 | DBG("Communication interrupted on command socket"); | |
3bd1e081 MD |
2270 | goto end; |
2271 | } | |
2272 | if (consumer_quit) { | |
2273 | DBG("consumer_thread_receive_fds received quit from signal"); | |
2274 | goto end; | |
2275 | } | |
2276 | DBG("received fds on sock"); | |
2277 | } | |
2278 | end: | |
2279 | DBG("consumer_thread_receive_fds exiting"); | |
2280 | ||
2281 | /* | |
2282 | * when all fds have hung up, the polling thread | |
2283 | * can exit cleanly | |
2284 | */ | |
2285 | consumer_quit = 1; | |
2286 | ||
2287 | /* | |
2288 | * 2s of grace period, if no polling events occur during | |
2289 | * this period, the polling thread will exit even if there | |
2290 | * are still open FDs (should not happen, but safety mechanism). | |
2291 | */ | |
2292 | consumer_poll_timeout = LTTNG_CONSUMER_POLL_TIMEOUT; | |
2293 | ||
04fdd819 | 2294 | /* |
c869f647 DG |
2295 | * Notify the data poll thread to poll back again and test the |
2296 | * consumer_quit state to quit gracefully. | |
04fdd819 MD |
2297 | */ |
2298 | do { | |
c869f647 DG |
2299 | struct lttng_consumer_stream *null_stream = NULL; |
2300 | ||
2301 | ret = write(ctx->consumer_poll_pipe[1], &null_stream, | |
2302 | sizeof(null_stream)); | |
6f94560a | 2303 | } while (ret < 0 && errno == EINTR); |
c869f647 | 2304 | |
e7b994a3 | 2305 | rcu_unregister_thread(); |
3bd1e081 MD |
2306 | return NULL; |
2307 | } | |
d41f73b7 | 2308 | |
4078b776 | 2309 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
2310 | struct lttng_consumer_local_data *ctx) |
2311 | { | |
2312 | switch (consumer_data.type) { | |
2313 | case LTTNG_CONSUMER_KERNEL: | |
2314 | return lttng_kconsumer_read_subbuffer(stream, ctx); | |
7753dea8 MD |
2315 | case LTTNG_CONSUMER32_UST: |
2316 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
2317 | return lttng_ustconsumer_read_subbuffer(stream, ctx); |
2318 | default: | |
2319 | ERR("Unknown consumer_data type"); | |
2320 | assert(0); | |
2321 | return -ENOSYS; | |
2322 | } | |
2323 | } | |
2324 | ||
2325 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
2326 | { | |
2327 | switch (consumer_data.type) { | |
2328 | case LTTNG_CONSUMER_KERNEL: | |
2329 | return lttng_kconsumer_on_recv_stream(stream); | |
7753dea8 MD |
2330 | case LTTNG_CONSUMER32_UST: |
2331 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
2332 | return lttng_ustconsumer_on_recv_stream(stream); |
2333 | default: | |
2334 | ERR("Unknown consumer_data type"); | |
2335 | assert(0); | |
2336 | return -ENOSYS; | |
2337 | } | |
2338 | } | |
e4421fec DG |
2339 | |
2340 | /* | |
2341 | * Allocate and set consumer data hash tables. | |
2342 | */ | |
2343 | void lttng_consumer_init(void) | |
2344 | { | |
2345 | consumer_data.stream_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
2346 | consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
00e2e675 | 2347 | consumer_data.relayd_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
43c34bc3 DG |
2348 | |
2349 | metadata_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
2350 | assert(metadata_ht); | |
2351 | data_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
2352 | assert(data_ht); | |
e4421fec | 2353 | } |
7735ef9e DG |
2354 | |
2355 | /* | |
2356 | * Process the ADD_RELAYD command receive by a consumer. | |
2357 | * | |
2358 | * This will create a relayd socket pair and add it to the relayd hash table. | |
2359 | * The caller MUST acquire a RCU read side lock before calling it. | |
2360 | */ | |
2361 | int consumer_add_relayd_socket(int net_seq_idx, int sock_type, | |
2362 | struct lttng_consumer_local_data *ctx, int sock, | |
2363 | struct pollfd *consumer_sockpoll, struct lttcomm_sock *relayd_sock) | |
2364 | { | |
2365 | int fd, ret = -1; | |
2366 | struct consumer_relayd_sock_pair *relayd; | |
2367 | ||
2368 | DBG("Consumer adding relayd socket (idx: %d)", net_seq_idx); | |
2369 | ||
2370 | /* Get relayd reference if exists. */ | |
2371 | relayd = consumer_find_relayd(net_seq_idx); | |
2372 | if (relayd == NULL) { | |
2373 | /* Not found. Allocate one. */ | |
2374 | relayd = consumer_allocate_relayd_sock_pair(net_seq_idx); | |
2375 | if (relayd == NULL) { | |
f73fabfd | 2376 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
7735ef9e DG |
2377 | goto error; |
2378 | } | |
2379 | } | |
2380 | ||
2381 | /* Poll on consumer socket. */ | |
2382 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2383 | ret = -EINTR; | |
2384 | goto error; | |
2385 | } | |
2386 | ||
2387 | /* Get relayd socket from session daemon */ | |
2388 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); | |
2389 | if (ret != sizeof(fd)) { | |
f73fabfd | 2390 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
7735ef9e DG |
2391 | ret = -1; |
2392 | goto error; | |
2393 | } | |
2394 | ||
2395 | /* Copy socket information and received FD */ | |
2396 | switch (sock_type) { | |
2397 | case LTTNG_STREAM_CONTROL: | |
2398 | /* Copy received lttcomm socket */ | |
2399 | lttcomm_copy_sock(&relayd->control_sock, relayd_sock); | |
2400 | ret = lttcomm_create_sock(&relayd->control_sock); | |
2401 | if (ret < 0) { | |
2402 | goto error; | |
2403 | } | |
2404 | ||
2405 | /* Close the created socket fd which is useless */ | |
2406 | close(relayd->control_sock.fd); | |
2407 | ||
2408 | /* Assign new file descriptor */ | |
2409 | relayd->control_sock.fd = fd; | |
2410 | break; | |
2411 | case LTTNG_STREAM_DATA: | |
2412 | /* Copy received lttcomm socket */ | |
2413 | lttcomm_copy_sock(&relayd->data_sock, relayd_sock); | |
2414 | ret = lttcomm_create_sock(&relayd->data_sock); | |
2415 | if (ret < 0) { | |
2416 | goto error; | |
2417 | } | |
2418 | ||
2419 | /* Close the created socket fd which is useless */ | |
2420 | close(relayd->data_sock.fd); | |
2421 | ||
2422 | /* Assign new file descriptor */ | |
2423 | relayd->data_sock.fd = fd; | |
2424 | break; | |
2425 | default: | |
2426 | ERR("Unknown relayd socket type (%d)", sock_type); | |
2427 | goto error; | |
2428 | } | |
2429 | ||
2430 | DBG("Consumer %s socket created successfully with net idx %d (fd: %d)", | |
2431 | sock_type == LTTNG_STREAM_CONTROL ? "control" : "data", | |
2432 | relayd->net_seq_idx, fd); | |
2433 | ||
2434 | /* | |
2435 | * Add relayd socket pair to consumer data hashtable. If object already | |
2436 | * exists or on error, the function gracefully returns. | |
2437 | */ | |
d09e1200 | 2438 | add_relayd(relayd); |
7735ef9e DG |
2439 | |
2440 | /* All good! */ | |
2441 | ret = 0; | |
2442 | ||
2443 | error: | |
2444 | return ret; | |
2445 | } |