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 | ||
00e2e675 DG |
175 | /* |
176 | * RCU protected relayd socket pair free. | |
177 | */ | |
178 | static void consumer_rcu_free_relayd(struct rcu_head *head) | |
179 | { | |
180 | struct lttng_ht_node_ulong *node = | |
181 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
182 | struct consumer_relayd_sock_pair *relayd = | |
183 | caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
184 | ||
185 | free(relayd); | |
186 | } | |
187 | ||
188 | /* | |
189 | * Destroy and free relayd socket pair object. | |
190 | * | |
191 | * This function MUST be called with the consumer_data lock acquired. | |
192 | */ | |
d09e1200 | 193 | static void destroy_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
194 | { |
195 | int ret; | |
196 | struct lttng_ht_iter iter; | |
197 | ||
173af62f DG |
198 | if (relayd == NULL) { |
199 | return; | |
200 | } | |
201 | ||
00e2e675 DG |
202 | DBG("Consumer destroy and close relayd socket pair"); |
203 | ||
204 | iter.iter.node = &relayd->node.node; | |
205 | ret = lttng_ht_del(consumer_data.relayd_ht, &iter); | |
173af62f DG |
206 | if (ret != 0) { |
207 | /* We assume the relayd was already destroyed */ | |
208 | return; | |
209 | } | |
00e2e675 DG |
210 | |
211 | /* Close all sockets */ | |
212 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
213 | (void) relayd_close(&relayd->control_sock); | |
214 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
215 | (void) relayd_close(&relayd->data_sock); | |
216 | ||
217 | /* RCU free() call */ | |
218 | call_rcu(&relayd->node.head, consumer_rcu_free_relayd); | |
219 | } | |
220 | ||
a6ba4fe1 DG |
221 | /* |
222 | * Flag a relayd socket pair for destruction. Destroy it if the refcount | |
223 | * reaches zero. | |
224 | * | |
225 | * RCU read side lock MUST be aquired before calling this function. | |
226 | */ | |
227 | void consumer_flag_relayd_for_destroy(struct consumer_relayd_sock_pair *relayd) | |
228 | { | |
229 | assert(relayd); | |
230 | ||
231 | /* Set destroy flag for this object */ | |
232 | uatomic_set(&relayd->destroy_flag, 1); | |
233 | ||
234 | /* Destroy the relayd if refcount is 0 */ | |
235 | if (uatomic_read(&relayd->refcount) == 0) { | |
d09e1200 | 236 | destroy_relayd(relayd); |
a6ba4fe1 DG |
237 | } |
238 | } | |
239 | ||
3bd1e081 MD |
240 | /* |
241 | * Remove a stream from the global list protected by a mutex. This | |
242 | * function is also responsible for freeing its data structures. | |
243 | */ | |
e316aad5 DG |
244 | void consumer_del_stream(struct lttng_consumer_stream *stream, |
245 | struct lttng_ht *ht) | |
3bd1e081 MD |
246 | { |
247 | int ret; | |
e4421fec | 248 | struct lttng_ht_iter iter; |
3bd1e081 | 249 | struct lttng_consumer_channel *free_chan = NULL; |
00e2e675 DG |
250 | struct consumer_relayd_sock_pair *relayd; |
251 | ||
252 | assert(stream); | |
3bd1e081 | 253 | |
e316aad5 DG |
254 | if (ht == NULL) { |
255 | /* Means the stream was allocated but not successfully added */ | |
256 | goto free_stream; | |
257 | } | |
258 | ||
3bd1e081 MD |
259 | pthread_mutex_lock(&consumer_data.lock); |
260 | ||
261 | switch (consumer_data.type) { | |
262 | case LTTNG_CONSUMER_KERNEL: | |
263 | if (stream->mmap_base != NULL) { | |
264 | ret = munmap(stream->mmap_base, stream->mmap_len); | |
265 | if (ret != 0) { | |
7a57cf92 | 266 | PERROR("munmap"); |
3bd1e081 MD |
267 | } |
268 | } | |
269 | break; | |
7753dea8 MD |
270 | case LTTNG_CONSUMER32_UST: |
271 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
272 | lttng_ustconsumer_del_stream(stream); |
273 | break; | |
274 | default: | |
275 | ERR("Unknown consumer_data type"); | |
276 | assert(0); | |
277 | goto end; | |
278 | } | |
279 | ||
6065ceec | 280 | rcu_read_lock(); |
04253271 | 281 | iter.iter.node = &stream->node.node; |
e316aad5 | 282 | ret = lttng_ht_del(ht, &iter); |
04253271 | 283 | assert(!ret); |
6065ceec DG |
284 | rcu_read_unlock(); |
285 | ||
50f8ae69 | 286 | assert(consumer_data.stream_count > 0); |
3bd1e081 | 287 | consumer_data.stream_count--; |
50f8ae69 | 288 | |
3bd1e081 | 289 | if (stream->out_fd >= 0) { |
4c462e79 MD |
290 | ret = close(stream->out_fd); |
291 | if (ret) { | |
292 | PERROR("close"); | |
293 | } | |
3bd1e081 | 294 | } |
b5c5fc29 | 295 | if (stream->wait_fd >= 0 && !stream->wait_fd_is_copy) { |
4c462e79 MD |
296 | ret = close(stream->wait_fd); |
297 | if (ret) { | |
298 | PERROR("close"); | |
299 | } | |
3bd1e081 | 300 | } |
2c1dd183 | 301 | if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) { |
4c462e79 MD |
302 | ret = close(stream->shm_fd); |
303 | if (ret) { | |
304 | PERROR("close"); | |
305 | } | |
3bd1e081 | 306 | } |
00e2e675 DG |
307 | |
308 | /* Check and cleanup relayd */ | |
b0b335c8 | 309 | rcu_read_lock(); |
00e2e675 DG |
310 | relayd = consumer_find_relayd(stream->net_seq_idx); |
311 | if (relayd != NULL) { | |
b0b335c8 MD |
312 | uatomic_dec(&relayd->refcount); |
313 | assert(uatomic_read(&relayd->refcount) >= 0); | |
173af62f | 314 | |
3f8e211f DG |
315 | /* Closing streams requires to lock the control socket. */ |
316 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
173af62f DG |
317 | ret = relayd_send_close_stream(&relayd->control_sock, |
318 | stream->relayd_stream_id, | |
319 | stream->next_net_seq_num - 1); | |
3f8e211f | 320 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); |
173af62f | 321 | if (ret < 0) { |
a4b92340 DG |
322 | DBG("Unable to close stream on the relayd. Continuing"); |
323 | /* | |
324 | * Continue here. There is nothing we can do for the relayd. | |
325 | * Chances are that the relayd has closed the socket so we just | |
326 | * continue cleaning up. | |
327 | */ | |
173af62f DG |
328 | } |
329 | ||
330 | /* Both conditions are met, we destroy the relayd. */ | |
331 | if (uatomic_read(&relayd->refcount) == 0 && | |
332 | uatomic_read(&relayd->destroy_flag)) { | |
d09e1200 | 333 | destroy_relayd(relayd); |
00e2e675 | 334 | } |
00e2e675 | 335 | } |
b0b335c8 | 336 | rcu_read_unlock(); |
00e2e675 | 337 | |
c30aaa51 MD |
338 | uatomic_dec(&stream->chan->refcount); |
339 | if (!uatomic_read(&stream->chan->refcount) | |
340 | && !uatomic_read(&stream->chan->nb_init_streams)) { | |
3bd1e081 | 341 | free_chan = stream->chan; |
00e2e675 DG |
342 | } |
343 | ||
3bd1e081 MD |
344 | end: |
345 | consumer_data.need_update = 1; | |
346 | pthread_mutex_unlock(&consumer_data.lock); | |
347 | ||
c30aaa51 | 348 | if (free_chan) { |
3bd1e081 | 349 | consumer_del_channel(free_chan); |
c30aaa51 | 350 | } |
e316aad5 DG |
351 | |
352 | free_stream: | |
353 | call_rcu(&stream->node.head, consumer_free_stream); | |
3bd1e081 MD |
354 | } |
355 | ||
356 | struct lttng_consumer_stream *consumer_allocate_stream( | |
357 | int channel_key, int stream_key, | |
358 | int shm_fd, int wait_fd, | |
359 | enum lttng_consumer_stream_state state, | |
360 | uint64_t mmap_len, | |
361 | enum lttng_event_output output, | |
6df2e2c9 MD |
362 | const char *path_name, |
363 | uid_t uid, | |
00e2e675 DG |
364 | gid_t gid, |
365 | int net_index, | |
c80048c6 | 366 | int metadata_flag, |
53632229 | 367 | uint64_t session_id, |
c80048c6 | 368 | int *alloc_ret) |
3bd1e081 MD |
369 | { |
370 | struct lttng_consumer_stream *stream; | |
3bd1e081 | 371 | |
effcf122 | 372 | stream = zmalloc(sizeof(*stream)); |
3bd1e081 | 373 | if (stream == NULL) { |
7a57cf92 | 374 | PERROR("malloc struct lttng_consumer_stream"); |
c80048c6 | 375 | *alloc_ret = -ENOMEM; |
7a57cf92 | 376 | goto end; |
3bd1e081 | 377 | } |
7a57cf92 DG |
378 | |
379 | /* | |
380 | * Get stream's channel reference. Needed when adding the stream to the | |
381 | * global hash table. | |
382 | */ | |
3bd1e081 MD |
383 | stream->chan = consumer_find_channel(channel_key); |
384 | if (!stream->chan) { | |
c80048c6 | 385 | *alloc_ret = -ENOENT; |
7a57cf92 | 386 | ERR("Unable to find channel for stream %d", stream_key); |
c80048c6 | 387 | goto error; |
3bd1e081 | 388 | } |
e316aad5 | 389 | |
3bd1e081 MD |
390 | stream->key = stream_key; |
391 | stream->shm_fd = shm_fd; | |
392 | stream->wait_fd = wait_fd; | |
393 | stream->out_fd = -1; | |
394 | stream->out_fd_offset = 0; | |
395 | stream->state = state; | |
396 | stream->mmap_len = mmap_len; | |
397 | stream->mmap_base = NULL; | |
398 | stream->output = output; | |
6df2e2c9 MD |
399 | stream->uid = uid; |
400 | stream->gid = gid; | |
00e2e675 DG |
401 | stream->net_seq_idx = net_index; |
402 | stream->metadata_flag = metadata_flag; | |
53632229 | 403 | stream->session_id = session_id; |
00e2e675 DG |
404 | strncpy(stream->path_name, path_name, sizeof(stream->path_name)); |
405 | stream->path_name[sizeof(stream->path_name) - 1] = '\0'; | |
53632229 | 406 | pthread_mutex_init(&stream->lock, NULL); |
58b1f425 DG |
407 | |
408 | /* | |
409 | * Index differently the metadata node because the thread is using an | |
410 | * internal hash table to match streams in the metadata_ht to the epoll set | |
411 | * file descriptor. | |
412 | */ | |
413 | if (metadata_flag) { | |
414 | lttng_ht_node_init_ulong(&stream->node, stream->wait_fd); | |
415 | } else { | |
416 | lttng_ht_node_init_ulong(&stream->node, stream->key); | |
417 | } | |
c30aaa51 | 418 | |
53632229 DG |
419 | /* Init session id node with the stream session id */ |
420 | lttng_ht_node_init_ulong(&stream->node_session_id, stream->session_id); | |
421 | ||
c869f647 DG |
422 | /* |
423 | * The cpu number is needed before using any ustctl_* actions. Ignored for | |
424 | * the kernel so the value does not matter. | |
425 | */ | |
426 | pthread_mutex_lock(&consumer_data.lock); | |
427 | stream->cpu = stream->chan->cpucount++; | |
428 | pthread_mutex_unlock(&consumer_data.lock); | |
429 | ||
c30aaa51 | 430 | DBG3("Allocated stream %s (key %d, shm_fd %d, wait_fd %d, mmap_len %llu," |
53632229 DG |
431 | " out_fd %d, net_seq_idx %d, session_id %" PRIu64, |
432 | stream->path_name, stream->key, stream->shm_fd, stream->wait_fd, | |
c30aaa51 | 433 | (unsigned long long) stream->mmap_len, stream->out_fd, |
53632229 | 434 | stream->net_seq_idx, stream->session_id); |
3bd1e081 | 435 | return stream; |
c80048c6 MD |
436 | |
437 | error: | |
438 | free(stream); | |
7a57cf92 | 439 | end: |
c80048c6 | 440 | return NULL; |
3bd1e081 MD |
441 | } |
442 | ||
443 | /* | |
444 | * Add a stream to the global list protected by a mutex. | |
445 | */ | |
43c34bc3 DG |
446 | static int consumer_add_stream(struct lttng_consumer_stream *stream, |
447 | struct lttng_ht *ht) | |
3bd1e081 MD |
448 | { |
449 | int ret = 0; | |
00e2e675 | 450 | struct consumer_relayd_sock_pair *relayd; |
3bd1e081 | 451 | |
e316aad5 | 452 | assert(stream); |
43c34bc3 | 453 | assert(ht); |
c77fc10a | 454 | |
e316aad5 DG |
455 | DBG3("Adding consumer stream %d", stream->key); |
456 | ||
457 | pthread_mutex_lock(&consumer_data.lock); | |
b0b335c8 | 458 | rcu_read_lock(); |
e316aad5 | 459 | |
43c34bc3 DG |
460 | /* Steal stream identifier to avoid having streams with the same key */ |
461 | consumer_steal_stream_key(stream->key, ht); | |
462 | ||
463 | lttng_ht_add_unique_ulong(ht, &stream->node); | |
00e2e675 DG |
464 | |
465 | /* Check and cleanup relayd */ | |
466 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
467 | if (relayd != NULL) { | |
b0b335c8 | 468 | uatomic_inc(&relayd->refcount); |
00e2e675 DG |
469 | } |
470 | ||
e316aad5 DG |
471 | /* Update channel refcount once added without error(s). */ |
472 | uatomic_inc(&stream->chan->refcount); | |
473 | ||
474 | /* | |
475 | * When nb_init_streams reaches 0, we don't need to trigger any action in | |
476 | * terms of destroying the associated channel, because the action that | |
477 | * causes the count to become 0 also causes a stream to be added. The | |
478 | * channel deletion will thus be triggered by the following removal of this | |
479 | * stream. | |
480 | */ | |
481 | if (uatomic_read(&stream->chan->nb_init_streams) > 0) { | |
482 | uatomic_dec(&stream->chan->nb_init_streams); | |
483 | } | |
484 | ||
485 | /* Update consumer data once the node is inserted. */ | |
3bd1e081 MD |
486 | consumer_data.stream_count++; |
487 | consumer_data.need_update = 1; | |
488 | ||
e316aad5 | 489 | rcu_read_unlock(); |
3bd1e081 | 490 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 491 | |
3bd1e081 MD |
492 | return ret; |
493 | } | |
494 | ||
00e2e675 | 495 | /* |
3f8e211f DG |
496 | * Add relayd socket to global consumer data hashtable. RCU read side lock MUST |
497 | * be acquired before calling this. | |
00e2e675 | 498 | */ |
d09e1200 | 499 | static int add_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
500 | { |
501 | int ret = 0; | |
502 | struct lttng_ht_node_ulong *node; | |
503 | struct lttng_ht_iter iter; | |
504 | ||
505 | if (relayd == NULL) { | |
506 | ret = -1; | |
507 | goto end; | |
508 | } | |
509 | ||
00e2e675 DG |
510 | lttng_ht_lookup(consumer_data.relayd_ht, |
511 | (void *)((unsigned long) relayd->net_seq_idx), &iter); | |
512 | node = lttng_ht_iter_get_node_ulong(&iter); | |
513 | if (node != NULL) { | |
00e2e675 DG |
514 | /* Relayd already exist. Ignore the insertion */ |
515 | goto end; | |
516 | } | |
517 | lttng_ht_add_unique_ulong(consumer_data.relayd_ht, &relayd->node); | |
518 | ||
00e2e675 DG |
519 | end: |
520 | return ret; | |
521 | } | |
522 | ||
523 | /* | |
524 | * Allocate and return a consumer relayd socket. | |
525 | */ | |
526 | struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair( | |
527 | int net_seq_idx) | |
528 | { | |
529 | struct consumer_relayd_sock_pair *obj = NULL; | |
530 | ||
531 | /* Negative net sequence index is a failure */ | |
532 | if (net_seq_idx < 0) { | |
533 | goto error; | |
534 | } | |
535 | ||
536 | obj = zmalloc(sizeof(struct consumer_relayd_sock_pair)); | |
537 | if (obj == NULL) { | |
538 | PERROR("zmalloc relayd sock"); | |
539 | goto error; | |
540 | } | |
541 | ||
542 | obj->net_seq_idx = net_seq_idx; | |
543 | obj->refcount = 0; | |
173af62f | 544 | obj->destroy_flag = 0; |
00e2e675 DG |
545 | lttng_ht_node_init_ulong(&obj->node, obj->net_seq_idx); |
546 | pthread_mutex_init(&obj->ctrl_sock_mutex, NULL); | |
547 | ||
548 | error: | |
549 | return obj; | |
550 | } | |
551 | ||
552 | /* | |
553 | * Find a relayd socket pair in the global consumer data. | |
554 | * | |
555 | * Return the object if found else NULL. | |
b0b335c8 MD |
556 | * RCU read-side lock must be held across this call and while using the |
557 | * returned object. | |
00e2e675 DG |
558 | */ |
559 | struct consumer_relayd_sock_pair *consumer_find_relayd(int key) | |
560 | { | |
561 | struct lttng_ht_iter iter; | |
562 | struct lttng_ht_node_ulong *node; | |
563 | struct consumer_relayd_sock_pair *relayd = NULL; | |
564 | ||
565 | /* Negative keys are lookup failures */ | |
566 | if (key < 0) { | |
567 | goto error; | |
568 | } | |
569 | ||
00e2e675 DG |
570 | lttng_ht_lookup(consumer_data.relayd_ht, (void *)((unsigned long) key), |
571 | &iter); | |
572 | node = lttng_ht_iter_get_node_ulong(&iter); | |
573 | if (node != NULL) { | |
574 | relayd = caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
575 | } | |
576 | ||
00e2e675 DG |
577 | error: |
578 | return relayd; | |
579 | } | |
580 | ||
581 | /* | |
582 | * Handle stream for relayd transmission if the stream applies for network | |
583 | * streaming where the net sequence index is set. | |
584 | * | |
585 | * Return destination file descriptor or negative value on error. | |
586 | */ | |
6197aea7 | 587 | static int write_relayd_stream_header(struct lttng_consumer_stream *stream, |
1d4dfdef DG |
588 | size_t data_size, unsigned long padding, |
589 | struct consumer_relayd_sock_pair *relayd) | |
00e2e675 DG |
590 | { |
591 | int outfd = -1, ret; | |
00e2e675 DG |
592 | struct lttcomm_relayd_data_hdr data_hdr; |
593 | ||
594 | /* Safety net */ | |
595 | assert(stream); | |
6197aea7 | 596 | assert(relayd); |
00e2e675 DG |
597 | |
598 | /* Reset data header */ | |
599 | memset(&data_hdr, 0, sizeof(data_hdr)); | |
600 | ||
00e2e675 DG |
601 | if (stream->metadata_flag) { |
602 | /* Caller MUST acquire the relayd control socket lock */ | |
603 | ret = relayd_send_metadata(&relayd->control_sock, data_size); | |
604 | if (ret < 0) { | |
605 | goto error; | |
606 | } | |
607 | ||
608 | /* Metadata are always sent on the control socket. */ | |
609 | outfd = relayd->control_sock.fd; | |
610 | } else { | |
611 | /* Set header with stream information */ | |
612 | data_hdr.stream_id = htobe64(stream->relayd_stream_id); | |
613 | data_hdr.data_size = htobe32(data_size); | |
1d4dfdef | 614 | data_hdr.padding_size = htobe32(padding); |
173af62f | 615 | data_hdr.net_seq_num = htobe64(stream->next_net_seq_num++); |
00e2e675 DG |
616 | /* Other fields are zeroed previously */ |
617 | ||
618 | ret = relayd_send_data_hdr(&relayd->data_sock, &data_hdr, | |
619 | sizeof(data_hdr)); | |
620 | if (ret < 0) { | |
621 | goto error; | |
622 | } | |
623 | ||
624 | /* Set to go on data socket */ | |
625 | outfd = relayd->data_sock.fd; | |
626 | } | |
627 | ||
628 | error: | |
629 | return outfd; | |
630 | } | |
631 | ||
702b1ea4 MD |
632 | static |
633 | void consumer_free_channel(struct rcu_head *head) | |
634 | { | |
635 | struct lttng_ht_node_ulong *node = | |
636 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
637 | struct lttng_consumer_channel *channel = | |
638 | caa_container_of(node, struct lttng_consumer_channel, node); | |
639 | ||
640 | free(channel); | |
641 | } | |
642 | ||
3bd1e081 MD |
643 | /* |
644 | * Remove a channel from the global list protected by a mutex. This | |
645 | * function is also responsible for freeing its data structures. | |
646 | */ | |
647 | void consumer_del_channel(struct lttng_consumer_channel *channel) | |
648 | { | |
649 | int ret; | |
e4421fec | 650 | struct lttng_ht_iter iter; |
3bd1e081 MD |
651 | |
652 | pthread_mutex_lock(&consumer_data.lock); | |
653 | ||
654 | switch (consumer_data.type) { | |
655 | case LTTNG_CONSUMER_KERNEL: | |
656 | break; | |
7753dea8 MD |
657 | case LTTNG_CONSUMER32_UST: |
658 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
659 | lttng_ustconsumer_del_channel(channel); |
660 | break; | |
661 | default: | |
662 | ERR("Unknown consumer_data type"); | |
663 | assert(0); | |
664 | goto end; | |
665 | } | |
666 | ||
6065ceec | 667 | rcu_read_lock(); |
04253271 MD |
668 | iter.iter.node = &channel->node.node; |
669 | ret = lttng_ht_del(consumer_data.channel_ht, &iter); | |
670 | assert(!ret); | |
6065ceec DG |
671 | rcu_read_unlock(); |
672 | ||
3bd1e081 MD |
673 | if (channel->mmap_base != NULL) { |
674 | ret = munmap(channel->mmap_base, channel->mmap_len); | |
675 | if (ret != 0) { | |
7a57cf92 | 676 | PERROR("munmap"); |
3bd1e081 MD |
677 | } |
678 | } | |
b5c5fc29 | 679 | if (channel->wait_fd >= 0 && !channel->wait_fd_is_copy) { |
4c462e79 MD |
680 | ret = close(channel->wait_fd); |
681 | if (ret) { | |
682 | PERROR("close"); | |
683 | } | |
3bd1e081 | 684 | } |
2c1dd183 | 685 | if (channel->shm_fd >= 0 && channel->wait_fd != channel->shm_fd) { |
4c462e79 MD |
686 | ret = close(channel->shm_fd); |
687 | if (ret) { | |
688 | PERROR("close"); | |
689 | } | |
3bd1e081 | 690 | } |
702b1ea4 MD |
691 | |
692 | call_rcu(&channel->node.head, consumer_free_channel); | |
3bd1e081 MD |
693 | end: |
694 | pthread_mutex_unlock(&consumer_data.lock); | |
695 | } | |
696 | ||
697 | struct lttng_consumer_channel *consumer_allocate_channel( | |
698 | int channel_key, | |
699 | int shm_fd, int wait_fd, | |
700 | uint64_t mmap_len, | |
c30aaa51 MD |
701 | uint64_t max_sb_size, |
702 | unsigned int nb_init_streams) | |
3bd1e081 MD |
703 | { |
704 | struct lttng_consumer_channel *channel; | |
705 | int ret; | |
706 | ||
276b26d1 | 707 | channel = zmalloc(sizeof(*channel)); |
3bd1e081 | 708 | if (channel == NULL) { |
7a57cf92 | 709 | PERROR("malloc struct lttng_consumer_channel"); |
3bd1e081 MD |
710 | goto end; |
711 | } | |
712 | channel->key = channel_key; | |
713 | channel->shm_fd = shm_fd; | |
714 | channel->wait_fd = wait_fd; | |
715 | channel->mmap_len = mmap_len; | |
716 | channel->max_sb_size = max_sb_size; | |
717 | channel->refcount = 0; | |
c30aaa51 | 718 | channel->nb_init_streams = nb_init_streams; |
e4421fec | 719 | lttng_ht_node_init_ulong(&channel->node, channel->key); |
3bd1e081 MD |
720 | |
721 | switch (consumer_data.type) { | |
722 | case LTTNG_CONSUMER_KERNEL: | |
723 | channel->mmap_base = NULL; | |
724 | channel->mmap_len = 0; | |
725 | break; | |
7753dea8 MD |
726 | case LTTNG_CONSUMER32_UST: |
727 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
728 | ret = lttng_ustconsumer_allocate_channel(channel); |
729 | if (ret) { | |
730 | free(channel); | |
731 | return NULL; | |
732 | } | |
733 | break; | |
734 | default: | |
735 | ERR("Unknown consumer_data type"); | |
736 | assert(0); | |
737 | goto end; | |
738 | } | |
739 | DBG("Allocated channel (key %d, shm_fd %d, wait_fd %d, mmap_len %llu, max_sb_size %llu)", | |
00e2e675 | 740 | channel->key, channel->shm_fd, channel->wait_fd, |
3bd1e081 MD |
741 | (unsigned long long) channel->mmap_len, |
742 | (unsigned long long) channel->max_sb_size); | |
743 | end: | |
744 | return channel; | |
745 | } | |
746 | ||
747 | /* | |
748 | * Add a channel to the global list protected by a mutex. | |
749 | */ | |
750 | int consumer_add_channel(struct lttng_consumer_channel *channel) | |
751 | { | |
c77fc10a DG |
752 | struct lttng_ht_node_ulong *node; |
753 | struct lttng_ht_iter iter; | |
754 | ||
3bd1e081 | 755 | pthread_mutex_lock(&consumer_data.lock); |
7ad0a0cb MD |
756 | /* Steal channel identifier, for UST */ |
757 | consumer_steal_channel_key(channel->key); | |
6065ceec | 758 | rcu_read_lock(); |
c77fc10a DG |
759 | |
760 | lttng_ht_lookup(consumer_data.channel_ht, | |
761 | (void *)((unsigned long) channel->key), &iter); | |
762 | node = lttng_ht_iter_get_node_ulong(&iter); | |
763 | if (node != NULL) { | |
764 | /* Channel already exist. Ignore the insertion */ | |
765 | goto end; | |
766 | } | |
767 | ||
04253271 | 768 | lttng_ht_add_unique_ulong(consumer_data.channel_ht, &channel->node); |
c77fc10a DG |
769 | |
770 | end: | |
6065ceec | 771 | rcu_read_unlock(); |
3bd1e081 | 772 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 773 | |
7ad0a0cb | 774 | return 0; |
3bd1e081 MD |
775 | } |
776 | ||
777 | /* | |
778 | * Allocate the pollfd structure and the local view of the out fds to avoid | |
779 | * doing a lookup in the linked list and concurrency issues when writing is | |
780 | * needed. Called with consumer_data.lock held. | |
781 | * | |
782 | * Returns the number of fds in the structures. | |
783 | */ | |
43c34bc3 | 784 | static int consumer_update_poll_array( |
3bd1e081 | 785 | struct lttng_consumer_local_data *ctx, struct pollfd **pollfd, |
43c34bc3 | 786 | struct lttng_consumer_stream **local_stream, struct lttng_ht *ht) |
3bd1e081 | 787 | { |
3bd1e081 | 788 | int i = 0; |
e4421fec DG |
789 | struct lttng_ht_iter iter; |
790 | struct lttng_consumer_stream *stream; | |
3bd1e081 MD |
791 | |
792 | DBG("Updating poll fd array"); | |
481d6c57 | 793 | rcu_read_lock(); |
43c34bc3 | 794 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { |
e4421fec | 795 | if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM) { |
3bd1e081 MD |
796 | continue; |
797 | } | |
e4421fec DG |
798 | DBG("Active FD %d", stream->wait_fd); |
799 | (*pollfd)[i].fd = stream->wait_fd; | |
3bd1e081 | 800 | (*pollfd)[i].events = POLLIN | POLLPRI; |
e4421fec | 801 | local_stream[i] = stream; |
3bd1e081 MD |
802 | i++; |
803 | } | |
481d6c57 | 804 | rcu_read_unlock(); |
3bd1e081 MD |
805 | |
806 | /* | |
50f8ae69 | 807 | * Insert the consumer_data_pipe at the end of the array and don't |
3bd1e081 MD |
808 | * increment i so nb_fd is the number of real FD. |
809 | */ | |
50f8ae69 | 810 | (*pollfd)[i].fd = ctx->consumer_data_pipe[0]; |
509bb1cf | 811 | (*pollfd)[i].events = POLLIN | POLLPRI; |
3bd1e081 MD |
812 | return i; |
813 | } | |
814 | ||
815 | /* | |
816 | * Poll on the should_quit pipe and the command socket return -1 on error and | |
817 | * should exit, 0 if data is available on the command socket | |
818 | */ | |
819 | int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll) | |
820 | { | |
821 | int num_rdy; | |
822 | ||
88f2b785 | 823 | restart: |
3bd1e081 MD |
824 | num_rdy = poll(consumer_sockpoll, 2, -1); |
825 | if (num_rdy == -1) { | |
88f2b785 MD |
826 | /* |
827 | * Restart interrupted system call. | |
828 | */ | |
829 | if (errno == EINTR) { | |
830 | goto restart; | |
831 | } | |
7a57cf92 | 832 | PERROR("Poll error"); |
3bd1e081 MD |
833 | goto exit; |
834 | } | |
509bb1cf | 835 | if (consumer_sockpoll[0].revents & (POLLIN | POLLPRI)) { |
3bd1e081 MD |
836 | DBG("consumer_should_quit wake up"); |
837 | goto exit; | |
838 | } | |
839 | return 0; | |
840 | ||
841 | exit: | |
842 | return -1; | |
843 | } | |
844 | ||
845 | /* | |
846 | * Set the error socket. | |
847 | */ | |
848 | void lttng_consumer_set_error_sock( | |
849 | struct lttng_consumer_local_data *ctx, int sock) | |
850 | { | |
851 | ctx->consumer_error_socket = sock; | |
852 | } | |
853 | ||
854 | /* | |
855 | * Set the command socket path. | |
856 | */ | |
3bd1e081 MD |
857 | void lttng_consumer_set_command_sock_path( |
858 | struct lttng_consumer_local_data *ctx, char *sock) | |
859 | { | |
860 | ctx->consumer_command_sock_path = sock; | |
861 | } | |
862 | ||
863 | /* | |
864 | * Send return code to the session daemon. | |
865 | * If the socket is not defined, we return 0, it is not a fatal error | |
866 | */ | |
867 | int lttng_consumer_send_error( | |
868 | struct lttng_consumer_local_data *ctx, int cmd) | |
869 | { | |
870 | if (ctx->consumer_error_socket > 0) { | |
871 | return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd, | |
872 | sizeof(enum lttcomm_sessiond_command)); | |
873 | } | |
874 | ||
875 | return 0; | |
876 | } | |
877 | ||
878 | /* | |
879 | * Close all the tracefiles and stream fds, should be called when all instances | |
880 | * are destroyed. | |
881 | */ | |
882 | void lttng_consumer_cleanup(void) | |
883 | { | |
e4421fec | 884 | struct lttng_ht_iter iter; |
6065ceec DG |
885 | struct lttng_ht_node_ulong *node; |
886 | ||
887 | rcu_read_lock(); | |
3bd1e081 | 888 | |
6065ceec DG |
889 | cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, node, |
890 | node) { | |
702b1ea4 MD |
891 | struct lttng_consumer_channel *channel = |
892 | caa_container_of(node, struct lttng_consumer_channel, node); | |
893 | consumer_del_channel(channel); | |
3bd1e081 | 894 | } |
6065ceec DG |
895 | |
896 | rcu_read_unlock(); | |
d6ce1df2 | 897 | |
d6ce1df2 | 898 | lttng_ht_destroy(consumer_data.channel_ht); |
3bd1e081 MD |
899 | } |
900 | ||
901 | /* | |
902 | * Called from signal handler. | |
903 | */ | |
904 | void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx) | |
905 | { | |
906 | int ret; | |
907 | consumer_quit = 1; | |
6f94560a MD |
908 | do { |
909 | ret = write(ctx->consumer_should_quit[1], "4", 1); | |
910 | } while (ret < 0 && errno == EINTR); | |
3bd1e081 | 911 | if (ret < 0) { |
7a57cf92 | 912 | PERROR("write consumer quit"); |
3bd1e081 MD |
913 | } |
914 | } | |
915 | ||
00e2e675 DG |
916 | void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream, |
917 | off_t orig_offset) | |
3bd1e081 MD |
918 | { |
919 | int outfd = stream->out_fd; | |
920 | ||
921 | /* | |
922 | * This does a blocking write-and-wait on any page that belongs to the | |
923 | * subbuffer prior to the one we just wrote. | |
924 | * Don't care about error values, as these are just hints and ways to | |
925 | * limit the amount of page cache used. | |
926 | */ | |
927 | if (orig_offset < stream->chan->max_sb_size) { | |
928 | return; | |
929 | } | |
b9182dd9 | 930 | lttng_sync_file_range(outfd, orig_offset - stream->chan->max_sb_size, |
3bd1e081 MD |
931 | stream->chan->max_sb_size, |
932 | SYNC_FILE_RANGE_WAIT_BEFORE | |
933 | | SYNC_FILE_RANGE_WRITE | |
934 | | SYNC_FILE_RANGE_WAIT_AFTER); | |
935 | /* | |
936 | * Give hints to the kernel about how we access the file: | |
937 | * POSIX_FADV_DONTNEED : we won't re-access data in a near future after | |
938 | * we write it. | |
939 | * | |
940 | * We need to call fadvise again after the file grows because the | |
941 | * kernel does not seem to apply fadvise to non-existing parts of the | |
942 | * file. | |
943 | * | |
944 | * Call fadvise _after_ having waited for the page writeback to | |
945 | * complete because the dirty page writeback semantic is not well | |
946 | * defined. So it can be expected to lead to lower throughput in | |
947 | * streaming. | |
948 | */ | |
949 | posix_fadvise(outfd, orig_offset - stream->chan->max_sb_size, | |
950 | stream->chan->max_sb_size, POSIX_FADV_DONTNEED); | |
951 | } | |
952 | ||
953 | /* | |
954 | * Initialise the necessary environnement : | |
955 | * - create a new context | |
956 | * - create the poll_pipe | |
957 | * - create the should_quit pipe (for signal handler) | |
958 | * - create the thread pipe (for splice) | |
959 | * | |
960 | * Takes a function pointer as argument, this function is called when data is | |
961 | * available on a buffer. This function is responsible to do the | |
962 | * kernctl_get_next_subbuf, read the data with mmap or splice depending on the | |
963 | * buffer configuration and then kernctl_put_next_subbuf at the end. | |
964 | * | |
965 | * Returns a pointer to the new context or NULL on error. | |
966 | */ | |
967 | struct lttng_consumer_local_data *lttng_consumer_create( | |
968 | enum lttng_consumer_type type, | |
4078b776 | 969 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
d41f73b7 | 970 | struct lttng_consumer_local_data *ctx), |
3bd1e081 MD |
971 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
972 | int (*recv_stream)(struct lttng_consumer_stream *stream), | |
973 | int (*update_stream)(int stream_key, uint32_t state)) | |
974 | { | |
975 | int ret, i; | |
976 | struct lttng_consumer_local_data *ctx; | |
977 | ||
978 | assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN || | |
979 | consumer_data.type == type); | |
980 | consumer_data.type = type; | |
981 | ||
effcf122 | 982 | ctx = zmalloc(sizeof(struct lttng_consumer_local_data)); |
3bd1e081 | 983 | if (ctx == NULL) { |
7a57cf92 | 984 | PERROR("allocating context"); |
3bd1e081 MD |
985 | goto error; |
986 | } | |
987 | ||
988 | ctx->consumer_error_socket = -1; | |
989 | /* assign the callbacks */ | |
990 | ctx->on_buffer_ready = buffer_ready; | |
991 | ctx->on_recv_channel = recv_channel; | |
992 | ctx->on_recv_stream = recv_stream; | |
993 | ctx->on_update_stream = update_stream; | |
994 | ||
50f8ae69 | 995 | ret = pipe(ctx->consumer_data_pipe); |
3bd1e081 | 996 | if (ret < 0) { |
7a57cf92 | 997 | PERROR("Error creating poll pipe"); |
3bd1e081 MD |
998 | goto error_poll_pipe; |
999 | } | |
1000 | ||
04fdd819 | 1001 | /* set read end of the pipe to non-blocking */ |
50f8ae69 | 1002 | ret = fcntl(ctx->consumer_data_pipe[0], F_SETFL, O_NONBLOCK); |
04fdd819 | 1003 | if (ret < 0) { |
7a57cf92 | 1004 | PERROR("fcntl O_NONBLOCK"); |
04fdd819 MD |
1005 | goto error_poll_fcntl; |
1006 | } | |
1007 | ||
1008 | /* set write end of the pipe to non-blocking */ | |
50f8ae69 | 1009 | ret = fcntl(ctx->consumer_data_pipe[1], F_SETFL, O_NONBLOCK); |
04fdd819 | 1010 | if (ret < 0) { |
7a57cf92 | 1011 | PERROR("fcntl O_NONBLOCK"); |
04fdd819 MD |
1012 | goto error_poll_fcntl; |
1013 | } | |
1014 | ||
3bd1e081 MD |
1015 | ret = pipe(ctx->consumer_should_quit); |
1016 | if (ret < 0) { | |
7a57cf92 | 1017 | PERROR("Error creating recv pipe"); |
3bd1e081 MD |
1018 | goto error_quit_pipe; |
1019 | } | |
1020 | ||
1021 | ret = pipe(ctx->consumer_thread_pipe); | |
1022 | if (ret < 0) { | |
7a57cf92 | 1023 | PERROR("Error creating thread pipe"); |
3bd1e081 MD |
1024 | goto error_thread_pipe; |
1025 | } | |
1026 | ||
fb3a43a9 DG |
1027 | ret = utils_create_pipe(ctx->consumer_metadata_pipe); |
1028 | if (ret < 0) { | |
1029 | goto error_metadata_pipe; | |
1030 | } | |
3bd1e081 | 1031 | |
fb3a43a9 DG |
1032 | ret = utils_create_pipe(ctx->consumer_splice_metadata_pipe); |
1033 | if (ret < 0) { | |
1034 | goto error_splice_pipe; | |
1035 | } | |
1036 | ||
1037 | return ctx; | |
3bd1e081 | 1038 | |
fb3a43a9 DG |
1039 | error_splice_pipe: |
1040 | utils_close_pipe(ctx->consumer_metadata_pipe); | |
1041 | error_metadata_pipe: | |
1042 | utils_close_pipe(ctx->consumer_thread_pipe); | |
3bd1e081 MD |
1043 | error_thread_pipe: |
1044 | for (i = 0; i < 2; i++) { | |
1045 | int err; | |
1046 | ||
1047 | err = close(ctx->consumer_should_quit[i]); | |
4c462e79 MD |
1048 | if (err) { |
1049 | PERROR("close"); | |
1050 | } | |
3bd1e081 | 1051 | } |
04fdd819 | 1052 | error_poll_fcntl: |
3bd1e081 MD |
1053 | error_quit_pipe: |
1054 | for (i = 0; i < 2; i++) { | |
1055 | int err; | |
1056 | ||
50f8ae69 | 1057 | err = close(ctx->consumer_data_pipe[i]); |
4c462e79 MD |
1058 | if (err) { |
1059 | PERROR("close"); | |
1060 | } | |
3bd1e081 MD |
1061 | } |
1062 | error_poll_pipe: | |
1063 | free(ctx); | |
1064 | error: | |
1065 | return NULL; | |
1066 | } | |
1067 | ||
1068 | /* | |
1069 | * Close all fds associated with the instance and free the context. | |
1070 | */ | |
1071 | void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx) | |
1072 | { | |
4c462e79 MD |
1073 | int ret; |
1074 | ||
1075 | ret = close(ctx->consumer_error_socket); | |
1076 | if (ret) { | |
1077 | PERROR("close"); | |
1078 | } | |
1079 | ret = close(ctx->consumer_thread_pipe[0]); | |
1080 | if (ret) { | |
1081 | PERROR("close"); | |
1082 | } | |
1083 | ret = close(ctx->consumer_thread_pipe[1]); | |
1084 | if (ret) { | |
1085 | PERROR("close"); | |
1086 | } | |
50f8ae69 | 1087 | ret = close(ctx->consumer_data_pipe[0]); |
4c462e79 MD |
1088 | if (ret) { |
1089 | PERROR("close"); | |
1090 | } | |
50f8ae69 | 1091 | ret = close(ctx->consumer_data_pipe[1]); |
4c462e79 MD |
1092 | if (ret) { |
1093 | PERROR("close"); | |
1094 | } | |
1095 | ret = close(ctx->consumer_should_quit[0]); | |
1096 | if (ret) { | |
1097 | PERROR("close"); | |
1098 | } | |
1099 | ret = close(ctx->consumer_should_quit[1]); | |
1100 | if (ret) { | |
1101 | PERROR("close"); | |
1102 | } | |
fb3a43a9 DG |
1103 | utils_close_pipe(ctx->consumer_splice_metadata_pipe); |
1104 | ||
3bd1e081 MD |
1105 | unlink(ctx->consumer_command_sock_path); |
1106 | free(ctx); | |
1107 | } | |
1108 | ||
6197aea7 DG |
1109 | /* |
1110 | * Write the metadata stream id on the specified file descriptor. | |
1111 | */ | |
1112 | static int write_relayd_metadata_id(int fd, | |
1113 | struct lttng_consumer_stream *stream, | |
1d4dfdef DG |
1114 | struct consumer_relayd_sock_pair *relayd, |
1115 | unsigned long padding) | |
6197aea7 DG |
1116 | { |
1117 | int ret; | |
1d4dfdef | 1118 | struct lttcomm_relayd_metadata_payload hdr; |
6197aea7 | 1119 | |
1d4dfdef DG |
1120 | hdr.stream_id = htobe64(stream->relayd_stream_id); |
1121 | hdr.padding_size = htobe32(padding); | |
6197aea7 | 1122 | do { |
1d4dfdef | 1123 | ret = write(fd, (void *) &hdr, sizeof(hdr)); |
6197aea7 DG |
1124 | } while (ret < 0 && errno == EINTR); |
1125 | if (ret < 0) { | |
1126 | PERROR("write metadata stream id"); | |
1127 | goto end; | |
1128 | } | |
1d4dfdef DG |
1129 | DBG("Metadata stream id %" PRIu64 " with padding %lu written before data", |
1130 | stream->relayd_stream_id, padding); | |
6197aea7 DG |
1131 | |
1132 | end: | |
1133 | return ret; | |
1134 | } | |
1135 | ||
3bd1e081 | 1136 | /* |
09e26845 DG |
1137 | * Mmap the ring buffer, read it and write the data to the tracefile. This is a |
1138 | * core function for writing trace buffers to either the local filesystem or | |
1139 | * the network. | |
1140 | * | |
1141 | * Careful review MUST be put if any changes occur! | |
3bd1e081 MD |
1142 | * |
1143 | * Returns the number of bytes written | |
1144 | */ | |
4078b776 | 1145 | ssize_t lttng_consumer_on_read_subbuffer_mmap( |
3bd1e081 | 1146 | struct lttng_consumer_local_data *ctx, |
1d4dfdef DG |
1147 | struct lttng_consumer_stream *stream, unsigned long len, |
1148 | unsigned long padding) | |
3bd1e081 | 1149 | { |
f02e1e8a DG |
1150 | unsigned long mmap_offset; |
1151 | ssize_t ret = 0, written = 0; | |
1152 | off_t orig_offset = stream->out_fd_offset; | |
1153 | /* Default is on the disk */ | |
1154 | int outfd = stream->out_fd; | |
f02e1e8a DG |
1155 | struct consumer_relayd_sock_pair *relayd = NULL; |
1156 | ||
1157 | /* RCU lock for the relayd pointer */ | |
1158 | rcu_read_lock(); | |
1159 | ||
1160 | /* Flag that the current stream if set for network streaming. */ | |
1161 | if (stream->net_seq_idx != -1) { | |
1162 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1163 | if (relayd == NULL) { | |
1164 | goto end; | |
1165 | } | |
1166 | } | |
1167 | ||
1168 | /* get the offset inside the fd to mmap */ | |
3bd1e081 MD |
1169 | switch (consumer_data.type) { |
1170 | case LTTNG_CONSUMER_KERNEL: | |
f02e1e8a DG |
1171 | ret = kernctl_get_mmap_read_offset(stream->wait_fd, &mmap_offset); |
1172 | break; | |
7753dea8 MD |
1173 | case LTTNG_CONSUMER32_UST: |
1174 | case LTTNG_CONSUMER64_UST: | |
f02e1e8a DG |
1175 | ret = lttng_ustctl_get_mmap_read_offset(stream->chan->handle, |
1176 | stream->buf, &mmap_offset); | |
1177 | break; | |
3bd1e081 MD |
1178 | default: |
1179 | ERR("Unknown consumer_data type"); | |
1180 | assert(0); | |
1181 | } | |
f02e1e8a DG |
1182 | if (ret != 0) { |
1183 | errno = -ret; | |
1184 | PERROR("tracer ctl get_mmap_read_offset"); | |
1185 | written = ret; | |
1186 | goto end; | |
1187 | } | |
b9182dd9 | 1188 | |
f02e1e8a DG |
1189 | /* Handle stream on the relayd if the output is on the network */ |
1190 | if (relayd) { | |
1191 | unsigned long netlen = len; | |
1192 | ||
1193 | /* | |
1194 | * Lock the control socket for the complete duration of the function | |
1195 | * since from this point on we will use the socket. | |
1196 | */ | |
1197 | if (stream->metadata_flag) { | |
1198 | /* Metadata requires the control socket. */ | |
1199 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1d4dfdef | 1200 | netlen += sizeof(struct lttcomm_relayd_metadata_payload); |
f02e1e8a DG |
1201 | } |
1202 | ||
1d4dfdef | 1203 | ret = write_relayd_stream_header(stream, netlen, padding, relayd); |
f02e1e8a DG |
1204 | if (ret >= 0) { |
1205 | /* Use the returned socket. */ | |
1206 | outfd = ret; | |
1207 | ||
1208 | /* Write metadata stream id before payload */ | |
1209 | if (stream->metadata_flag) { | |
1d4dfdef | 1210 | ret = write_relayd_metadata_id(outfd, stream, relayd, padding); |
f02e1e8a | 1211 | if (ret < 0) { |
f02e1e8a DG |
1212 | written = ret; |
1213 | goto end; | |
1214 | } | |
f02e1e8a DG |
1215 | } |
1216 | } | |
1217 | /* Else, use the default set before which is the filesystem. */ | |
1d4dfdef DG |
1218 | } else { |
1219 | /* No streaming, we have to set the len with the full padding */ | |
1220 | len += padding; | |
f02e1e8a DG |
1221 | } |
1222 | ||
1223 | while (len > 0) { | |
1224 | do { | |
1225 | ret = write(outfd, stream->mmap_base + mmap_offset, len); | |
1226 | } while (ret < 0 && errno == EINTR); | |
1d4dfdef | 1227 | DBG("Consumer mmap write() ret %zd (len %lu)", ret, len); |
f02e1e8a DG |
1228 | if (ret < 0) { |
1229 | PERROR("Error in file write"); | |
1230 | if (written == 0) { | |
1231 | written = ret; | |
1232 | } | |
1233 | goto end; | |
1234 | } else if (ret > len) { | |
77c7c900 | 1235 | PERROR("Error in file write (ret %zd > len %lu)", ret, len); |
f02e1e8a DG |
1236 | written += ret; |
1237 | goto end; | |
1238 | } else { | |
1239 | len -= ret; | |
1240 | mmap_offset += ret; | |
1241 | } | |
f02e1e8a DG |
1242 | |
1243 | /* This call is useless on a socket so better save a syscall. */ | |
1244 | if (!relayd) { | |
1245 | /* This won't block, but will start writeout asynchronously */ | |
1246 | lttng_sync_file_range(outfd, stream->out_fd_offset, ret, | |
1247 | SYNC_FILE_RANGE_WRITE); | |
1248 | stream->out_fd_offset += ret; | |
1249 | } | |
1250 | written += ret; | |
1251 | } | |
1252 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
1253 | ||
1254 | end: | |
1255 | /* Unlock only if ctrl socket used */ | |
1256 | if (relayd && stream->metadata_flag) { | |
1257 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1258 | } | |
1259 | ||
1260 | rcu_read_unlock(); | |
1261 | return written; | |
3bd1e081 MD |
1262 | } |
1263 | ||
1264 | /* | |
1265 | * Splice the data from the ring buffer to the tracefile. | |
1266 | * | |
1267 | * Returns the number of bytes spliced. | |
1268 | */ | |
4078b776 | 1269 | ssize_t lttng_consumer_on_read_subbuffer_splice( |
3bd1e081 | 1270 | struct lttng_consumer_local_data *ctx, |
1d4dfdef DG |
1271 | struct lttng_consumer_stream *stream, unsigned long len, |
1272 | unsigned long padding) | |
3bd1e081 | 1273 | { |
f02e1e8a DG |
1274 | ssize_t ret = 0, written = 0, ret_splice = 0; |
1275 | loff_t offset = 0; | |
1276 | off_t orig_offset = stream->out_fd_offset; | |
1277 | int fd = stream->wait_fd; | |
1278 | /* Default is on the disk */ | |
1279 | int outfd = stream->out_fd; | |
f02e1e8a | 1280 | struct consumer_relayd_sock_pair *relayd = NULL; |
fb3a43a9 | 1281 | int *splice_pipe; |
f02e1e8a | 1282 | |
3bd1e081 MD |
1283 | switch (consumer_data.type) { |
1284 | case LTTNG_CONSUMER_KERNEL: | |
f02e1e8a | 1285 | break; |
7753dea8 MD |
1286 | case LTTNG_CONSUMER32_UST: |
1287 | case LTTNG_CONSUMER64_UST: | |
f02e1e8a | 1288 | /* Not supported for user space tracing */ |
3bd1e081 MD |
1289 | return -ENOSYS; |
1290 | default: | |
1291 | ERR("Unknown consumer_data type"); | |
1292 | assert(0); | |
3bd1e081 MD |
1293 | } |
1294 | ||
f02e1e8a DG |
1295 | /* RCU lock for the relayd pointer */ |
1296 | rcu_read_lock(); | |
1297 | ||
1298 | /* Flag that the current stream if set for network streaming. */ | |
1299 | if (stream->net_seq_idx != -1) { | |
1300 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1301 | if (relayd == NULL) { | |
1302 | goto end; | |
1303 | } | |
1304 | } | |
1305 | ||
fb3a43a9 DG |
1306 | /* |
1307 | * Choose right pipe for splice. Metadata and trace data are handled by | |
1308 | * different threads hence the use of two pipes in order not to race or | |
1309 | * corrupt the written data. | |
1310 | */ | |
1311 | if (stream->metadata_flag) { | |
1312 | splice_pipe = ctx->consumer_splice_metadata_pipe; | |
1313 | } else { | |
1314 | splice_pipe = ctx->consumer_thread_pipe; | |
1315 | } | |
1316 | ||
f02e1e8a | 1317 | /* Write metadata stream id before payload */ |
1d4dfdef DG |
1318 | if (relayd) { |
1319 | int total_len = len; | |
f02e1e8a | 1320 | |
1d4dfdef DG |
1321 | if (stream->metadata_flag) { |
1322 | /* | |
1323 | * Lock the control socket for the complete duration of the function | |
1324 | * since from this point on we will use the socket. | |
1325 | */ | |
1326 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1327 | ||
1328 | ret = write_relayd_metadata_id(splice_pipe[1], stream, relayd, | |
1329 | padding); | |
1330 | if (ret < 0) { | |
1331 | written = ret; | |
1332 | goto end; | |
1333 | } | |
1334 | ||
1335 | total_len += sizeof(struct lttcomm_relayd_metadata_payload); | |
1336 | } | |
1337 | ||
1338 | ret = write_relayd_stream_header(stream, total_len, padding, relayd); | |
1339 | if (ret >= 0) { | |
1340 | /* Use the returned socket. */ | |
1341 | outfd = ret; | |
1342 | } else { | |
1343 | ERR("Remote relayd disconnected. Stopping"); | |
f02e1e8a DG |
1344 | goto end; |
1345 | } | |
1d4dfdef DG |
1346 | } else { |
1347 | /* No streaming, we have to set the len with the full padding */ | |
1348 | len += padding; | |
f02e1e8a DG |
1349 | } |
1350 | ||
1351 | while (len > 0) { | |
1d4dfdef DG |
1352 | DBG("splice chan to pipe offset %lu of len %lu (fd : %d, pipe: %d)", |
1353 | (unsigned long)offset, len, fd, splice_pipe[1]); | |
fb3a43a9 | 1354 | ret_splice = splice(fd, &offset, splice_pipe[1], NULL, len, |
f02e1e8a DG |
1355 | SPLICE_F_MOVE | SPLICE_F_MORE); |
1356 | DBG("splice chan to pipe, ret %zd", ret_splice); | |
1357 | if (ret_splice < 0) { | |
1358 | PERROR("Error in relay splice"); | |
1359 | if (written == 0) { | |
1360 | written = ret_splice; | |
1361 | } | |
1362 | ret = errno; | |
1363 | goto splice_error; | |
1364 | } | |
1365 | ||
1366 | /* Handle stream on the relayd if the output is on the network */ | |
1367 | if (relayd) { | |
1368 | if (stream->metadata_flag) { | |
1d4dfdef DG |
1369 | size_t metadata_payload_size = |
1370 | sizeof(struct lttcomm_relayd_metadata_payload); | |
1371 | ||
f02e1e8a | 1372 | /* Update counter to fit the spliced data */ |
1d4dfdef DG |
1373 | ret_splice += metadata_payload_size; |
1374 | len += metadata_payload_size; | |
f02e1e8a DG |
1375 | /* |
1376 | * We do this so the return value can match the len passed as | |
1377 | * argument to this function. | |
1378 | */ | |
1d4dfdef | 1379 | written -= metadata_payload_size; |
f02e1e8a DG |
1380 | } |
1381 | } | |
1382 | ||
1383 | /* Splice data out */ | |
fb3a43a9 | 1384 | ret_splice = splice(splice_pipe[0], NULL, outfd, NULL, |
f02e1e8a | 1385 | ret_splice, SPLICE_F_MOVE | SPLICE_F_MORE); |
1d4dfdef | 1386 | DBG("Consumer splice pipe to file, ret %zd", ret_splice); |
f02e1e8a DG |
1387 | if (ret_splice < 0) { |
1388 | PERROR("Error in file splice"); | |
1389 | if (written == 0) { | |
1390 | written = ret_splice; | |
1391 | } | |
1392 | ret = errno; | |
1393 | goto splice_error; | |
1394 | } else if (ret_splice > len) { | |
1395 | errno = EINVAL; | |
1396 | PERROR("Wrote more data than requested %zd (len: %lu)", | |
1397 | ret_splice, len); | |
1398 | written += ret_splice; | |
1399 | ret = errno; | |
1400 | goto splice_error; | |
1401 | } | |
1402 | len -= ret_splice; | |
1403 | ||
1404 | /* This call is useless on a socket so better save a syscall. */ | |
1405 | if (!relayd) { | |
1406 | /* This won't block, but will start writeout asynchronously */ | |
1407 | lttng_sync_file_range(outfd, stream->out_fd_offset, ret_splice, | |
1408 | SYNC_FILE_RANGE_WRITE); | |
1409 | stream->out_fd_offset += ret_splice; | |
1410 | } | |
1411 | written += ret_splice; | |
1412 | } | |
1413 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
1414 | ||
1415 | ret = ret_splice; | |
1416 | ||
1417 | goto end; | |
1418 | ||
1419 | splice_error: | |
1420 | /* send the appropriate error description to sessiond */ | |
1421 | switch (ret) { | |
1422 | case EBADF: | |
f73fabfd | 1423 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_EBADF); |
f02e1e8a DG |
1424 | break; |
1425 | case EINVAL: | |
f73fabfd | 1426 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_EINVAL); |
f02e1e8a DG |
1427 | break; |
1428 | case ENOMEM: | |
f73fabfd | 1429 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ENOMEM); |
f02e1e8a DG |
1430 | break; |
1431 | case ESPIPE: | |
f73fabfd | 1432 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ESPIPE); |
f02e1e8a DG |
1433 | break; |
1434 | } | |
1435 | ||
1436 | end: | |
1437 | if (relayd && stream->metadata_flag) { | |
1438 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1439 | } | |
1440 | ||
1441 | rcu_read_unlock(); | |
1442 | return written; | |
3bd1e081 MD |
1443 | } |
1444 | ||
1445 | /* | |
1446 | * Take a snapshot for a specific fd | |
1447 | * | |
1448 | * Returns 0 on success, < 0 on error | |
1449 | */ | |
1450 | int lttng_consumer_take_snapshot(struct lttng_consumer_local_data *ctx, | |
1451 | struct lttng_consumer_stream *stream) | |
1452 | { | |
1453 | switch (consumer_data.type) { | |
1454 | case LTTNG_CONSUMER_KERNEL: | |
1455 | return lttng_kconsumer_take_snapshot(ctx, stream); | |
7753dea8 MD |
1456 | case LTTNG_CONSUMER32_UST: |
1457 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1458 | return lttng_ustconsumer_take_snapshot(ctx, stream); |
1459 | default: | |
1460 | ERR("Unknown consumer_data type"); | |
1461 | assert(0); | |
1462 | return -ENOSYS; | |
1463 | } | |
1464 | ||
1465 | } | |
1466 | ||
1467 | /* | |
1468 | * Get the produced position | |
1469 | * | |
1470 | * Returns 0 on success, < 0 on error | |
1471 | */ | |
1472 | int lttng_consumer_get_produced_snapshot( | |
1473 | struct lttng_consumer_local_data *ctx, | |
1474 | struct lttng_consumer_stream *stream, | |
1475 | unsigned long *pos) | |
1476 | { | |
1477 | switch (consumer_data.type) { | |
1478 | case LTTNG_CONSUMER_KERNEL: | |
1479 | return lttng_kconsumer_get_produced_snapshot(ctx, stream, pos); | |
7753dea8 MD |
1480 | case LTTNG_CONSUMER32_UST: |
1481 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1482 | return lttng_ustconsumer_get_produced_snapshot(ctx, stream, pos); |
1483 | default: | |
1484 | ERR("Unknown consumer_data type"); | |
1485 | assert(0); | |
1486 | return -ENOSYS; | |
1487 | } | |
1488 | } | |
1489 | ||
1490 | int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, | |
1491 | int sock, struct pollfd *consumer_sockpoll) | |
1492 | { | |
1493 | switch (consumer_data.type) { | |
1494 | case LTTNG_CONSUMER_KERNEL: | |
1495 | return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
7753dea8 MD |
1496 | case LTTNG_CONSUMER32_UST: |
1497 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1498 | return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll); |
1499 | default: | |
1500 | ERR("Unknown consumer_data type"); | |
1501 | assert(0); | |
1502 | return -ENOSYS; | |
1503 | } | |
1504 | } | |
1505 | ||
43c34bc3 DG |
1506 | /* |
1507 | * Iterate over all streams of the hashtable and free them properly. | |
1508 | * | |
1509 | * WARNING: *MUST* be used with data stream only. | |
1510 | */ | |
1511 | static void destroy_data_stream_ht(struct lttng_ht *ht) | |
1512 | { | |
1513 | int ret; | |
1514 | struct lttng_ht_iter iter; | |
1515 | struct lttng_consumer_stream *stream; | |
1516 | ||
1517 | if (ht == NULL) { | |
1518 | return; | |
1519 | } | |
1520 | ||
1521 | rcu_read_lock(); | |
1522 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { | |
1523 | ret = lttng_ht_del(ht, &iter); | |
1524 | assert(!ret); | |
1525 | ||
1526 | call_rcu(&stream->node.head, consumer_free_stream); | |
1527 | } | |
1528 | rcu_read_unlock(); | |
1529 | ||
1530 | lttng_ht_destroy(ht); | |
1531 | } | |
1532 | ||
fb3a43a9 | 1533 | /* |
f724d81e | 1534 | * Iterate over all streams of the hashtable and free them properly. |
e316aad5 DG |
1535 | * |
1536 | * XXX: Should not be only for metadata stream or else use an other name. | |
fb3a43a9 DG |
1537 | */ |
1538 | static void destroy_stream_ht(struct lttng_ht *ht) | |
1539 | { | |
1540 | int ret; | |
1541 | struct lttng_ht_iter iter; | |
1542 | struct lttng_consumer_stream *stream; | |
1543 | ||
1544 | if (ht == NULL) { | |
1545 | return; | |
1546 | } | |
1547 | ||
d09e1200 | 1548 | rcu_read_lock(); |
58b1f425 | 1549 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { |
fb3a43a9 DG |
1550 | ret = lttng_ht_del(ht, &iter); |
1551 | assert(!ret); | |
1552 | ||
58b1f425 | 1553 | call_rcu(&stream->node.head, consumer_free_stream); |
fb3a43a9 | 1554 | } |
d09e1200 | 1555 | rcu_read_unlock(); |
fb3a43a9 DG |
1556 | |
1557 | lttng_ht_destroy(ht); | |
1558 | } | |
1559 | ||
1560 | /* | |
1561 | * Clean up a metadata stream and free its memory. | |
1562 | */ | |
e316aad5 DG |
1563 | void consumer_del_metadata_stream(struct lttng_consumer_stream *stream, |
1564 | struct lttng_ht *ht) | |
fb3a43a9 DG |
1565 | { |
1566 | int ret; | |
e316aad5 DG |
1567 | struct lttng_ht_iter iter; |
1568 | struct lttng_consumer_channel *free_chan = NULL; | |
fb3a43a9 DG |
1569 | struct consumer_relayd_sock_pair *relayd; |
1570 | ||
1571 | assert(stream); | |
1572 | /* | |
1573 | * This call should NEVER receive regular stream. It must always be | |
1574 | * metadata stream and this is crucial for data structure synchronization. | |
1575 | */ | |
1576 | assert(stream->metadata_flag); | |
1577 | ||
e316aad5 DG |
1578 | DBG3("Consumer delete metadata stream %d", stream->wait_fd); |
1579 | ||
1580 | if (ht == NULL) { | |
1581 | /* Means the stream was allocated but not successfully added */ | |
1582 | goto free_stream; | |
1583 | } | |
1584 | ||
fb3a43a9 DG |
1585 | pthread_mutex_lock(&consumer_data.lock); |
1586 | switch (consumer_data.type) { | |
1587 | case LTTNG_CONSUMER_KERNEL: | |
1588 | if (stream->mmap_base != NULL) { | |
1589 | ret = munmap(stream->mmap_base, stream->mmap_len); | |
1590 | if (ret != 0) { | |
1591 | PERROR("munmap metadata stream"); | |
1592 | } | |
1593 | } | |
1594 | break; | |
1595 | case LTTNG_CONSUMER32_UST: | |
1596 | case LTTNG_CONSUMER64_UST: | |
1597 | lttng_ustconsumer_del_stream(stream); | |
1598 | break; | |
1599 | default: | |
1600 | ERR("Unknown consumer_data type"); | |
1601 | assert(0); | |
e316aad5 | 1602 | goto end; |
fb3a43a9 | 1603 | } |
fb3a43a9 | 1604 | |
c869f647 | 1605 | rcu_read_lock(); |
58b1f425 | 1606 | iter.iter.node = &stream->node.node; |
c869f647 DG |
1607 | ret = lttng_ht_del(ht, &iter); |
1608 | assert(!ret); | |
1609 | rcu_read_unlock(); | |
1610 | ||
fb3a43a9 DG |
1611 | if (stream->out_fd >= 0) { |
1612 | ret = close(stream->out_fd); | |
1613 | if (ret) { | |
1614 | PERROR("close"); | |
1615 | } | |
1616 | } | |
1617 | ||
1618 | if (stream->wait_fd >= 0 && !stream->wait_fd_is_copy) { | |
1619 | ret = close(stream->wait_fd); | |
1620 | if (ret) { | |
1621 | PERROR("close"); | |
1622 | } | |
1623 | } | |
1624 | ||
1625 | if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) { | |
1626 | ret = close(stream->shm_fd); | |
1627 | if (ret) { | |
1628 | PERROR("close"); | |
1629 | } | |
1630 | } | |
1631 | ||
1632 | /* Check and cleanup relayd */ | |
1633 | rcu_read_lock(); | |
1634 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1635 | if (relayd != NULL) { | |
1636 | uatomic_dec(&relayd->refcount); | |
1637 | assert(uatomic_read(&relayd->refcount) >= 0); | |
1638 | ||
1639 | /* Closing streams requires to lock the control socket. */ | |
1640 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1641 | ret = relayd_send_close_stream(&relayd->control_sock, | |
1642 | stream->relayd_stream_id, stream->next_net_seq_num - 1); | |
1643 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1644 | if (ret < 0) { | |
1645 | DBG("Unable to close stream on the relayd. Continuing"); | |
1646 | /* | |
1647 | * Continue here. There is nothing we can do for the relayd. | |
1648 | * Chances are that the relayd has closed the socket so we just | |
1649 | * continue cleaning up. | |
1650 | */ | |
1651 | } | |
1652 | ||
1653 | /* Both conditions are met, we destroy the relayd. */ | |
1654 | if (uatomic_read(&relayd->refcount) == 0 && | |
1655 | uatomic_read(&relayd->destroy_flag)) { | |
d09e1200 | 1656 | destroy_relayd(relayd); |
fb3a43a9 DG |
1657 | } |
1658 | } | |
1659 | rcu_read_unlock(); | |
1660 | ||
1661 | /* Atomically decrement channel refcount since other threads can use it. */ | |
1662 | uatomic_dec(&stream->chan->refcount); | |
c30aaa51 MD |
1663 | if (!uatomic_read(&stream->chan->refcount) |
1664 | && !uatomic_read(&stream->chan->nb_init_streams)) { | |
1665 | /* Go for channel deletion! */ | |
e316aad5 | 1666 | free_chan = stream->chan; |
fb3a43a9 DG |
1667 | } |
1668 | ||
e316aad5 DG |
1669 | end: |
1670 | pthread_mutex_unlock(&consumer_data.lock); | |
1671 | ||
1672 | if (free_chan) { | |
1673 | consumer_del_channel(free_chan); | |
1674 | } | |
1675 | ||
1676 | free_stream: | |
58b1f425 | 1677 | call_rcu(&stream->node.head, consumer_free_stream); |
fb3a43a9 DG |
1678 | } |
1679 | ||
1680 | /* | |
1681 | * Action done with the metadata stream when adding it to the consumer internal | |
1682 | * data structures to handle it. | |
1683 | */ | |
e316aad5 DG |
1684 | static int consumer_add_metadata_stream(struct lttng_consumer_stream *stream, |
1685 | struct lttng_ht *ht) | |
fb3a43a9 | 1686 | { |
e316aad5 | 1687 | int ret = 0; |
fb3a43a9 DG |
1688 | struct consumer_relayd_sock_pair *relayd; |
1689 | ||
e316aad5 DG |
1690 | assert(stream); |
1691 | assert(ht); | |
1692 | ||
1693 | DBG3("Adding metadata stream %d to hash table", stream->wait_fd); | |
1694 | ||
1695 | pthread_mutex_lock(&consumer_data.lock); | |
1696 | ||
e316aad5 DG |
1697 | /* |
1698 | * From here, refcounts are updated so be _careful_ when returning an error | |
1699 | * after this point. | |
1700 | */ | |
1701 | ||
fb3a43a9 | 1702 | rcu_read_lock(); |
e316aad5 | 1703 | /* Find relayd and, if one is found, increment refcount. */ |
fb3a43a9 DG |
1704 | relayd = consumer_find_relayd(stream->net_seq_idx); |
1705 | if (relayd != NULL) { | |
1706 | uatomic_inc(&relayd->refcount); | |
1707 | } | |
e316aad5 DG |
1708 | |
1709 | /* Update channel refcount once added without error(s). */ | |
1710 | uatomic_inc(&stream->chan->refcount); | |
1711 | ||
1712 | /* | |
1713 | * When nb_init_streams reaches 0, we don't need to trigger any action in | |
1714 | * terms of destroying the associated channel, because the action that | |
1715 | * causes the count to become 0 also causes a stream to be added. The | |
1716 | * channel deletion will thus be triggered by the following removal of this | |
1717 | * stream. | |
1718 | */ | |
1719 | if (uatomic_read(&stream->chan->nb_init_streams) > 0) { | |
1720 | uatomic_dec(&stream->chan->nb_init_streams); | |
1721 | } | |
1722 | ||
43c34bc3 DG |
1723 | /* Steal stream identifier to avoid having streams with the same key */ |
1724 | consumer_steal_stream_key(stream->key, ht); | |
1725 | ||
58b1f425 | 1726 | lttng_ht_add_unique_ulong(ht, &stream->node); |
fb3a43a9 | 1727 | rcu_read_unlock(); |
e316aad5 | 1728 | |
e316aad5 DG |
1729 | pthread_mutex_unlock(&consumer_data.lock); |
1730 | return ret; | |
fb3a43a9 DG |
1731 | } |
1732 | ||
1733 | /* | |
1734 | * Thread polls on metadata file descriptor and write them on disk or on the | |
1735 | * network. | |
1736 | */ | |
7d980def | 1737 | void *consumer_thread_metadata_poll(void *data) |
fb3a43a9 DG |
1738 | { |
1739 | int ret, i, pollfd; | |
1740 | uint32_t revents, nb_fd; | |
e316aad5 | 1741 | struct lttng_consumer_stream *stream = NULL; |
fb3a43a9 DG |
1742 | struct lttng_ht_iter iter; |
1743 | struct lttng_ht_node_ulong *node; | |
fb3a43a9 DG |
1744 | struct lttng_poll_event events; |
1745 | struct lttng_consumer_local_data *ctx = data; | |
1746 | ssize_t len; | |
1747 | ||
1748 | rcu_register_thread(); | |
1749 | ||
1750 | DBG("Thread metadata poll started"); | |
1751 | ||
fb3a43a9 DG |
1752 | /* Size is set to 1 for the consumer_metadata pipe */ |
1753 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
1754 | if (ret < 0) { | |
1755 | ERR("Poll set creation failed"); | |
1756 | goto end; | |
1757 | } | |
1758 | ||
1759 | ret = lttng_poll_add(&events, ctx->consumer_metadata_pipe[0], LPOLLIN); | |
1760 | if (ret < 0) { | |
1761 | goto end; | |
1762 | } | |
1763 | ||
1764 | /* Main loop */ | |
1765 | DBG("Metadata main loop started"); | |
1766 | ||
1767 | while (1) { | |
1768 | lttng_poll_reset(&events); | |
1769 | ||
1770 | nb_fd = LTTNG_POLL_GETNB(&events); | |
1771 | ||
1772 | /* Only the metadata pipe is set */ | |
1773 | if (nb_fd == 0 && consumer_quit == 1) { | |
1774 | goto end; | |
1775 | } | |
1776 | ||
1777 | restart: | |
1778 | DBG("Metadata poll wait with %d fd(s)", nb_fd); | |
1779 | ret = lttng_poll_wait(&events, -1); | |
1780 | DBG("Metadata event catched in thread"); | |
1781 | if (ret < 0) { | |
1782 | if (errno == EINTR) { | |
e316aad5 | 1783 | ERR("Poll EINTR catched"); |
fb3a43a9 DG |
1784 | goto restart; |
1785 | } | |
1786 | goto error; | |
1787 | } | |
1788 | ||
e316aad5 | 1789 | /* From here, the event is a metadata wait fd */ |
fb3a43a9 DG |
1790 | for (i = 0; i < nb_fd; i++) { |
1791 | revents = LTTNG_POLL_GETEV(&events, i); | |
1792 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1793 | ||
e316aad5 DG |
1794 | /* Just don't waste time if no returned events for the fd */ |
1795 | if (!revents) { | |
1796 | continue; | |
1797 | } | |
1798 | ||
fb3a43a9 | 1799 | if (pollfd == ctx->consumer_metadata_pipe[0]) { |
4adabd61 | 1800 | if (revents & (LPOLLERR | LPOLLHUP )) { |
fb3a43a9 DG |
1801 | DBG("Metadata thread pipe hung up"); |
1802 | /* | |
1803 | * Remove the pipe from the poll set and continue the loop | |
1804 | * since their might be data to consume. | |
1805 | */ | |
1806 | lttng_poll_del(&events, ctx->consumer_metadata_pipe[0]); | |
1807 | close(ctx->consumer_metadata_pipe[0]); | |
1808 | continue; | |
1809 | } else if (revents & LPOLLIN) { | |
fb3a43a9 | 1810 | do { |
633d0084 DG |
1811 | /* Get the stream pointer received */ |
1812 | ret = read(pollfd, &stream, sizeof(stream)); | |
fb3a43a9 | 1813 | } while (ret < 0 && errno == EINTR); |
633d0084 DG |
1814 | if (ret < 0 || |
1815 | ret < sizeof(struct lttng_consumer_stream *)) { | |
fb3a43a9 | 1816 | PERROR("read metadata stream"); |
fb3a43a9 DG |
1817 | /* |
1818 | * Let's continue here and hope we can still work | |
1819 | * without stopping the consumer. XXX: Should we? | |
1820 | */ | |
1821 | continue; | |
1822 | } | |
1823 | ||
1824 | DBG("Adding metadata stream %d to poll set", | |
1825 | stream->wait_fd); | |
1826 | ||
e316aad5 DG |
1827 | ret = consumer_add_metadata_stream(stream, metadata_ht); |
1828 | if (ret) { | |
1829 | ERR("Unable to add metadata stream"); | |
1830 | /* Stream was not setup properly. Continuing. */ | |
1831 | consumer_del_metadata_stream(stream, NULL); | |
1832 | continue; | |
1833 | } | |
fb3a43a9 DG |
1834 | |
1835 | /* Add metadata stream to the global poll events list */ | |
1836 | lttng_poll_add(&events, stream->wait_fd, | |
1837 | LPOLLIN | LPOLLPRI); | |
fb3a43a9 DG |
1838 | } |
1839 | ||
e316aad5 | 1840 | /* Handle other stream */ |
fb3a43a9 DG |
1841 | continue; |
1842 | } | |
1843 | ||
d09e1200 | 1844 | rcu_read_lock(); |
fb3a43a9 DG |
1845 | lttng_ht_lookup(metadata_ht, (void *)((unsigned long) pollfd), |
1846 | &iter); | |
1847 | node = lttng_ht_iter_get_node_ulong(&iter); | |
e316aad5 | 1848 | assert(node); |
fb3a43a9 DG |
1849 | |
1850 | stream = caa_container_of(node, struct lttng_consumer_stream, | |
58b1f425 | 1851 | node); |
fb3a43a9 | 1852 | |
e316aad5 | 1853 | /* Check for error event */ |
4adabd61 | 1854 | if (revents & (LPOLLERR | LPOLLHUP)) { |
e316aad5 | 1855 | DBG("Metadata fd %d is hup|err.", pollfd); |
fb3a43a9 DG |
1856 | if (!stream->hangup_flush_done |
1857 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
1858 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
1859 | DBG("Attempting to flush and consume the UST buffers"); | |
1860 | lttng_ustconsumer_on_stream_hangup(stream); | |
1861 | ||
1862 | /* We just flushed the stream now read it. */ | |
4bb94b75 DG |
1863 | do { |
1864 | len = ctx->on_buffer_ready(stream, ctx); | |
1865 | /* | |
1866 | * We don't check the return value here since if we get | |
1867 | * a negative len, it means an error occured thus we | |
1868 | * simply remove it from the poll set and free the | |
1869 | * stream. | |
1870 | */ | |
1871 | } while (len > 0); | |
fb3a43a9 DG |
1872 | } |
1873 | ||
fb3a43a9 | 1874 | lttng_poll_del(&events, stream->wait_fd); |
e316aad5 DG |
1875 | /* |
1876 | * This call update the channel states, closes file descriptors | |
1877 | * and securely free the stream. | |
1878 | */ | |
1879 | consumer_del_metadata_stream(stream, metadata_ht); | |
1880 | } else if (revents & (LPOLLIN | LPOLLPRI)) { | |
1881 | /* Get the data out of the metadata file descriptor */ | |
1882 | DBG("Metadata available on fd %d", pollfd); | |
1883 | assert(stream->wait_fd == pollfd); | |
1884 | ||
1885 | len = ctx->on_buffer_ready(stream, ctx); | |
1886 | /* It's ok to have an unavailable sub-buffer */ | |
b64403e3 | 1887 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
e316aad5 DG |
1888 | rcu_read_unlock(); |
1889 | goto end; | |
1890 | } else if (len > 0) { | |
1891 | stream->data_read = 1; | |
1892 | } | |
fb3a43a9 | 1893 | } |
e316aad5 DG |
1894 | |
1895 | /* Release RCU lock for the stream looked up */ | |
d09e1200 | 1896 | rcu_read_unlock(); |
fb3a43a9 DG |
1897 | } |
1898 | } | |
1899 | ||
1900 | error: | |
1901 | end: | |
1902 | DBG("Metadata poll thread exiting"); | |
1903 | lttng_poll_clean(&events); | |
1904 | ||
1905 | if (metadata_ht) { | |
1906 | destroy_stream_ht(metadata_ht); | |
1907 | } | |
1908 | ||
1909 | rcu_unregister_thread(); | |
1910 | return NULL; | |
1911 | } | |
1912 | ||
3bd1e081 | 1913 | /* |
e4421fec | 1914 | * This thread polls the fds in the set to consume the data and write |
3bd1e081 MD |
1915 | * it to tracefile if necessary. |
1916 | */ | |
7d980def | 1917 | void *consumer_thread_data_poll(void *data) |
3bd1e081 MD |
1918 | { |
1919 | int num_rdy, num_hup, high_prio, ret, i; | |
1920 | struct pollfd *pollfd = NULL; | |
1921 | /* local view of the streams */ | |
c869f647 | 1922 | struct lttng_consumer_stream **local_stream = NULL, *new_stream = NULL; |
3bd1e081 MD |
1923 | /* local view of consumer_data.fds_count */ |
1924 | int nb_fd = 0; | |
3bd1e081 | 1925 | struct lttng_consumer_local_data *ctx = data; |
00e2e675 | 1926 | ssize_t len; |
3bd1e081 | 1927 | |
e7b994a3 DG |
1928 | rcu_register_thread(); |
1929 | ||
43c34bc3 DG |
1930 | data_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1931 | if (data_ht == NULL) { | |
1932 | goto end; | |
1933 | } | |
1934 | ||
effcf122 | 1935 | local_stream = zmalloc(sizeof(struct lttng_consumer_stream)); |
3bd1e081 MD |
1936 | |
1937 | while (1) { | |
1938 | high_prio = 0; | |
1939 | num_hup = 0; | |
1940 | ||
1941 | /* | |
e4421fec | 1942 | * the fds set has been updated, we need to update our |
3bd1e081 MD |
1943 | * local array as well |
1944 | */ | |
1945 | pthread_mutex_lock(&consumer_data.lock); | |
1946 | if (consumer_data.need_update) { | |
1947 | if (pollfd != NULL) { | |
1948 | free(pollfd); | |
1949 | pollfd = NULL; | |
1950 | } | |
1951 | if (local_stream != NULL) { | |
1952 | free(local_stream); | |
1953 | local_stream = NULL; | |
1954 | } | |
1955 | ||
50f8ae69 | 1956 | /* allocate for all fds + 1 for the consumer_data_pipe */ |
effcf122 | 1957 | pollfd = zmalloc((consumer_data.stream_count + 1) * sizeof(struct pollfd)); |
3bd1e081 | 1958 | if (pollfd == NULL) { |
7a57cf92 | 1959 | PERROR("pollfd malloc"); |
3bd1e081 MD |
1960 | pthread_mutex_unlock(&consumer_data.lock); |
1961 | goto end; | |
1962 | } | |
1963 | ||
50f8ae69 | 1964 | /* allocate for all fds + 1 for the consumer_data_pipe */ |
effcf122 | 1965 | local_stream = zmalloc((consumer_data.stream_count + 1) * |
3bd1e081 MD |
1966 | sizeof(struct lttng_consumer_stream)); |
1967 | if (local_stream == NULL) { | |
7a57cf92 | 1968 | PERROR("local_stream malloc"); |
3bd1e081 MD |
1969 | pthread_mutex_unlock(&consumer_data.lock); |
1970 | goto end; | |
1971 | } | |
43c34bc3 DG |
1972 | ret = consumer_update_poll_array(ctx, &pollfd, local_stream, |
1973 | data_ht); | |
3bd1e081 MD |
1974 | if (ret < 0) { |
1975 | ERR("Error in allocating pollfd or local_outfds"); | |
f73fabfd | 1976 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
1977 | pthread_mutex_unlock(&consumer_data.lock); |
1978 | goto end; | |
1979 | } | |
1980 | nb_fd = ret; | |
1981 | consumer_data.need_update = 0; | |
1982 | } | |
1983 | pthread_mutex_unlock(&consumer_data.lock); | |
1984 | ||
4078b776 MD |
1985 | /* No FDs and consumer_quit, consumer_cleanup the thread */ |
1986 | if (nb_fd == 0 && consumer_quit == 1) { | |
1987 | goto end; | |
1988 | } | |
3bd1e081 | 1989 | /* poll on the array of fds */ |
88f2b785 | 1990 | restart: |
3bd1e081 MD |
1991 | DBG("polling on %d fd", nb_fd + 1); |
1992 | num_rdy = poll(pollfd, nb_fd + 1, consumer_poll_timeout); | |
1993 | DBG("poll num_rdy : %d", num_rdy); | |
1994 | if (num_rdy == -1) { | |
88f2b785 MD |
1995 | /* |
1996 | * Restart interrupted system call. | |
1997 | */ | |
1998 | if (errno == EINTR) { | |
1999 | goto restart; | |
2000 | } | |
7a57cf92 | 2001 | PERROR("Poll error"); |
f73fabfd | 2002 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
2003 | goto end; |
2004 | } else if (num_rdy == 0) { | |
2005 | DBG("Polling thread timed out"); | |
2006 | goto end; | |
2007 | } | |
2008 | ||
3bd1e081 | 2009 | /* |
50f8ae69 | 2010 | * If the consumer_data_pipe triggered poll go directly to the |
00e2e675 DG |
2011 | * beginning of the loop to update the array. We want to prioritize |
2012 | * array update over low-priority reads. | |
3bd1e081 | 2013 | */ |
509bb1cf | 2014 | if (pollfd[nb_fd].revents & (POLLIN | POLLPRI)) { |
04fdd819 | 2015 | size_t pipe_readlen; |
04fdd819 | 2016 | |
50f8ae69 | 2017 | DBG("consumer_data_pipe wake up"); |
04fdd819 MD |
2018 | /* Consume 1 byte of pipe data */ |
2019 | do { | |
50f8ae69 | 2020 | pipe_readlen = read(ctx->consumer_data_pipe[0], &new_stream, |
c869f647 | 2021 | sizeof(new_stream)); |
04fdd819 | 2022 | } while (pipe_readlen == -1 && errno == EINTR); |
c869f647 DG |
2023 | |
2024 | /* | |
2025 | * If the stream is NULL, just ignore it. It's also possible that | |
2026 | * the sessiond poll thread changed the consumer_quit state and is | |
2027 | * waking us up to test it. | |
2028 | */ | |
2029 | if (new_stream == NULL) { | |
2030 | continue; | |
2031 | } | |
2032 | ||
43c34bc3 | 2033 | ret = consumer_add_stream(new_stream, data_ht); |
c869f647 DG |
2034 | if (ret) { |
2035 | ERR("Consumer add stream %d failed. Continuing", | |
2036 | new_stream->key); | |
2037 | /* | |
2038 | * At this point, if the add_stream fails, it is not in the | |
2039 | * hash table thus passing the NULL value here. | |
2040 | */ | |
2041 | consumer_del_stream(new_stream, NULL); | |
2042 | } | |
2043 | ||
2044 | /* Continue to update the local streams and handle prio ones */ | |
3bd1e081 MD |
2045 | continue; |
2046 | } | |
2047 | ||
2048 | /* Take care of high priority channels first. */ | |
2049 | for (i = 0; i < nb_fd; i++) { | |
fb3a43a9 | 2050 | if (pollfd[i].revents & POLLPRI) { |
d41f73b7 MD |
2051 | DBG("Urgent read on fd %d", pollfd[i].fd); |
2052 | high_prio = 1; | |
4078b776 | 2053 | len = ctx->on_buffer_ready(local_stream[i], ctx); |
d41f73b7 | 2054 | /* it's ok to have an unavailable sub-buffer */ |
b64403e3 | 2055 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
4078b776 MD |
2056 | goto end; |
2057 | } else if (len > 0) { | |
2058 | local_stream[i]->data_read = 1; | |
d41f73b7 | 2059 | } |
3bd1e081 MD |
2060 | } |
2061 | } | |
2062 | ||
4078b776 MD |
2063 | /* |
2064 | * If we read high prio channel in this loop, try again | |
2065 | * for more high prio data. | |
2066 | */ | |
2067 | if (high_prio) { | |
3bd1e081 MD |
2068 | continue; |
2069 | } | |
2070 | ||
2071 | /* Take care of low priority channels. */ | |
4078b776 MD |
2072 | for (i = 0; i < nb_fd; i++) { |
2073 | if ((pollfd[i].revents & POLLIN) || | |
2074 | local_stream[i]->hangup_flush_done) { | |
4078b776 MD |
2075 | DBG("Normal read on fd %d", pollfd[i].fd); |
2076 | len = ctx->on_buffer_ready(local_stream[i], ctx); | |
2077 | /* it's ok to have an unavailable sub-buffer */ | |
b64403e3 | 2078 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
4078b776 MD |
2079 | goto end; |
2080 | } else if (len > 0) { | |
2081 | local_stream[i]->data_read = 1; | |
2082 | } | |
2083 | } | |
2084 | } | |
2085 | ||
2086 | /* Handle hangup and errors */ | |
2087 | for (i = 0; i < nb_fd; i++) { | |
2088 | if (!local_stream[i]->hangup_flush_done | |
2089 | && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL)) | |
2090 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
2091 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
2092 | DBG("fd %d is hup|err|nval. Attempting flush and read.", | |
2093 | pollfd[i].fd); | |
2094 | lttng_ustconsumer_on_stream_hangup(local_stream[i]); | |
2095 | /* Attempt read again, for the data we just flushed. */ | |
2096 | local_stream[i]->data_read = 1; | |
2097 | } | |
2098 | /* | |
2099 | * If the poll flag is HUP/ERR/NVAL and we have | |
2100 | * read no data in this pass, we can remove the | |
2101 | * stream from its hash table. | |
2102 | */ | |
2103 | if ((pollfd[i].revents & POLLHUP)) { | |
2104 | DBG("Polling fd %d tells it has hung up.", pollfd[i].fd); | |
2105 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2106 | consumer_del_stream(local_stream[i], data_ht); |
4078b776 MD |
2107 | num_hup++; |
2108 | } | |
2109 | } else if (pollfd[i].revents & POLLERR) { | |
2110 | ERR("Error returned in polling fd %d.", pollfd[i].fd); | |
2111 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2112 | consumer_del_stream(local_stream[i], data_ht); |
4078b776 MD |
2113 | num_hup++; |
2114 | } | |
2115 | } else if (pollfd[i].revents & POLLNVAL) { | |
2116 | ERR("Polling fd %d tells fd is not open.", pollfd[i].fd); | |
2117 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2118 | consumer_del_stream(local_stream[i], data_ht); |
4078b776 | 2119 | num_hup++; |
3bd1e081 MD |
2120 | } |
2121 | } | |
4078b776 | 2122 | local_stream[i]->data_read = 0; |
3bd1e081 MD |
2123 | } |
2124 | } | |
2125 | end: | |
2126 | DBG("polling thread exiting"); | |
2127 | if (pollfd != NULL) { | |
2128 | free(pollfd); | |
2129 | pollfd = NULL; | |
2130 | } | |
2131 | if (local_stream != NULL) { | |
2132 | free(local_stream); | |
2133 | local_stream = NULL; | |
2134 | } | |
fb3a43a9 DG |
2135 | |
2136 | /* | |
2137 | * Close the write side of the pipe so epoll_wait() in | |
7d980def DG |
2138 | * consumer_thread_metadata_poll can catch it. The thread is monitoring the |
2139 | * read side of the pipe. If we close them both, epoll_wait strangely does | |
2140 | * not return and could create a endless wait period if the pipe is the | |
2141 | * only tracked fd in the poll set. The thread will take care of closing | |
2142 | * the read side. | |
fb3a43a9 DG |
2143 | */ |
2144 | close(ctx->consumer_metadata_pipe[1]); | |
fb3a43a9 | 2145 | |
43c34bc3 DG |
2146 | if (data_ht) { |
2147 | destroy_data_stream_ht(data_ht); | |
2148 | } | |
2149 | ||
e7b994a3 | 2150 | rcu_unregister_thread(); |
3bd1e081 MD |
2151 | return NULL; |
2152 | } | |
2153 | ||
2154 | /* | |
2155 | * This thread listens on the consumerd socket and receives the file | |
2156 | * descriptors from the session daemon. | |
2157 | */ | |
7d980def | 2158 | void *consumer_thread_sessiond_poll(void *data) |
3bd1e081 MD |
2159 | { |
2160 | int sock, client_socket, ret; | |
2161 | /* | |
2162 | * structure to poll for incoming data on communication socket avoids | |
2163 | * making blocking sockets. | |
2164 | */ | |
2165 | struct pollfd consumer_sockpoll[2]; | |
2166 | struct lttng_consumer_local_data *ctx = data; | |
2167 | ||
e7b994a3 DG |
2168 | rcu_register_thread(); |
2169 | ||
3bd1e081 MD |
2170 | DBG("Creating command socket %s", ctx->consumer_command_sock_path); |
2171 | unlink(ctx->consumer_command_sock_path); | |
2172 | client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path); | |
2173 | if (client_socket < 0) { | |
2174 | ERR("Cannot create command socket"); | |
2175 | goto end; | |
2176 | } | |
2177 | ||
2178 | ret = lttcomm_listen_unix_sock(client_socket); | |
2179 | if (ret < 0) { | |
2180 | goto end; | |
2181 | } | |
2182 | ||
32258573 | 2183 | DBG("Sending ready command to lttng-sessiond"); |
f73fabfd | 2184 | ret = lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_COMMAND_SOCK_READY); |
3bd1e081 MD |
2185 | /* return < 0 on error, but == 0 is not fatal */ |
2186 | if (ret < 0) { | |
32258573 | 2187 | ERR("Error sending ready command to lttng-sessiond"); |
3bd1e081 MD |
2188 | goto end; |
2189 | } | |
2190 | ||
2191 | ret = fcntl(client_socket, F_SETFL, O_NONBLOCK); | |
2192 | if (ret < 0) { | |
7a57cf92 | 2193 | PERROR("fcntl O_NONBLOCK"); |
3bd1e081 MD |
2194 | goto end; |
2195 | } | |
2196 | ||
2197 | /* prepare the FDs to poll : to client socket and the should_quit pipe */ | |
2198 | consumer_sockpoll[0].fd = ctx->consumer_should_quit[0]; | |
2199 | consumer_sockpoll[0].events = POLLIN | POLLPRI; | |
2200 | consumer_sockpoll[1].fd = client_socket; | |
2201 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
2202 | ||
2203 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2204 | goto end; | |
2205 | } | |
2206 | DBG("Connection on client_socket"); | |
2207 | ||
2208 | /* Blocking call, waiting for transmission */ | |
2209 | sock = lttcomm_accept_unix_sock(client_socket); | |
2210 | if (sock <= 0) { | |
2211 | WARN("On accept"); | |
2212 | goto end; | |
2213 | } | |
2214 | ret = fcntl(sock, F_SETFL, O_NONBLOCK); | |
2215 | if (ret < 0) { | |
7a57cf92 | 2216 | PERROR("fcntl O_NONBLOCK"); |
3bd1e081 MD |
2217 | goto end; |
2218 | } | |
2219 | ||
2220 | /* update the polling structure to poll on the established socket */ | |
2221 | consumer_sockpoll[1].fd = sock; | |
2222 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
2223 | ||
2224 | while (1) { | |
2225 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2226 | goto end; | |
2227 | } | |
2228 | DBG("Incoming command on sock"); | |
2229 | ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
2230 | if (ret == -ENOENT) { | |
2231 | DBG("Received STOP command"); | |
2232 | goto end; | |
2233 | } | |
4cbc1a04 DG |
2234 | if (ret <= 0) { |
2235 | /* | |
2236 | * This could simply be a session daemon quitting. Don't output | |
2237 | * ERR() here. | |
2238 | */ | |
2239 | DBG("Communication interrupted on command socket"); | |
3bd1e081 MD |
2240 | goto end; |
2241 | } | |
2242 | if (consumer_quit) { | |
2243 | DBG("consumer_thread_receive_fds received quit from signal"); | |
2244 | goto end; | |
2245 | } | |
2246 | DBG("received fds on sock"); | |
2247 | } | |
2248 | end: | |
2249 | DBG("consumer_thread_receive_fds exiting"); | |
2250 | ||
2251 | /* | |
2252 | * when all fds have hung up, the polling thread | |
2253 | * can exit cleanly | |
2254 | */ | |
2255 | consumer_quit = 1; | |
2256 | ||
2257 | /* | |
2258 | * 2s of grace period, if no polling events occur during | |
2259 | * this period, the polling thread will exit even if there | |
2260 | * are still open FDs (should not happen, but safety mechanism). | |
2261 | */ | |
2262 | consumer_poll_timeout = LTTNG_CONSUMER_POLL_TIMEOUT; | |
2263 | ||
04fdd819 | 2264 | /* |
c869f647 DG |
2265 | * Notify the data poll thread to poll back again and test the |
2266 | * consumer_quit state to quit gracefully. | |
04fdd819 MD |
2267 | */ |
2268 | do { | |
c869f647 DG |
2269 | struct lttng_consumer_stream *null_stream = NULL; |
2270 | ||
50f8ae69 | 2271 | ret = write(ctx->consumer_data_pipe[1], &null_stream, |
c869f647 | 2272 | sizeof(null_stream)); |
6f94560a | 2273 | } while (ret < 0 && errno == EINTR); |
c869f647 | 2274 | |
e7b994a3 | 2275 | rcu_unregister_thread(); |
3bd1e081 MD |
2276 | return NULL; |
2277 | } | |
d41f73b7 | 2278 | |
4078b776 | 2279 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
2280 | struct lttng_consumer_local_data *ctx) |
2281 | { | |
2282 | switch (consumer_data.type) { | |
2283 | case LTTNG_CONSUMER_KERNEL: | |
2284 | return lttng_kconsumer_read_subbuffer(stream, ctx); | |
7753dea8 MD |
2285 | case LTTNG_CONSUMER32_UST: |
2286 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
2287 | return lttng_ustconsumer_read_subbuffer(stream, ctx); |
2288 | default: | |
2289 | ERR("Unknown consumer_data type"); | |
2290 | assert(0); | |
2291 | return -ENOSYS; | |
2292 | } | |
2293 | } | |
2294 | ||
2295 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
2296 | { | |
2297 | switch (consumer_data.type) { | |
2298 | case LTTNG_CONSUMER_KERNEL: | |
2299 | return lttng_kconsumer_on_recv_stream(stream); | |
7753dea8 MD |
2300 | case LTTNG_CONSUMER32_UST: |
2301 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
2302 | return lttng_ustconsumer_on_recv_stream(stream); |
2303 | default: | |
2304 | ERR("Unknown consumer_data type"); | |
2305 | assert(0); | |
2306 | return -ENOSYS; | |
2307 | } | |
2308 | } | |
e4421fec DG |
2309 | |
2310 | /* | |
2311 | * Allocate and set consumer data hash tables. | |
2312 | */ | |
2313 | void lttng_consumer_init(void) | |
2314 | { | |
e4421fec | 2315 | consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
00e2e675 | 2316 | consumer_data.relayd_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
53632229 | 2317 | consumer_data.stream_list_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
43c34bc3 DG |
2318 | |
2319 | metadata_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
2320 | assert(metadata_ht); | |
2321 | data_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
2322 | assert(data_ht); | |
e4421fec | 2323 | } |
7735ef9e DG |
2324 | |
2325 | /* | |
2326 | * Process the ADD_RELAYD command receive by a consumer. | |
2327 | * | |
2328 | * This will create a relayd socket pair and add it to the relayd hash table. | |
2329 | * The caller MUST acquire a RCU read side lock before calling it. | |
2330 | */ | |
2331 | int consumer_add_relayd_socket(int net_seq_idx, int sock_type, | |
2332 | struct lttng_consumer_local_data *ctx, int sock, | |
2333 | struct pollfd *consumer_sockpoll, struct lttcomm_sock *relayd_sock) | |
2334 | { | |
2335 | int fd, ret = -1; | |
2336 | struct consumer_relayd_sock_pair *relayd; | |
2337 | ||
2338 | DBG("Consumer adding relayd socket (idx: %d)", net_seq_idx); | |
2339 | ||
2340 | /* Get relayd reference if exists. */ | |
2341 | relayd = consumer_find_relayd(net_seq_idx); | |
2342 | if (relayd == NULL) { | |
2343 | /* Not found. Allocate one. */ | |
2344 | relayd = consumer_allocate_relayd_sock_pair(net_seq_idx); | |
2345 | if (relayd == NULL) { | |
f73fabfd | 2346 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
7735ef9e DG |
2347 | goto error; |
2348 | } | |
2349 | } | |
2350 | ||
2351 | /* Poll on consumer socket. */ | |
2352 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2353 | ret = -EINTR; | |
2354 | goto error; | |
2355 | } | |
2356 | ||
2357 | /* Get relayd socket from session daemon */ | |
2358 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); | |
2359 | if (ret != sizeof(fd)) { | |
f73fabfd | 2360 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
7735ef9e DG |
2361 | ret = -1; |
2362 | goto error; | |
2363 | } | |
2364 | ||
2365 | /* Copy socket information and received FD */ | |
2366 | switch (sock_type) { | |
2367 | case LTTNG_STREAM_CONTROL: | |
2368 | /* Copy received lttcomm socket */ | |
2369 | lttcomm_copy_sock(&relayd->control_sock, relayd_sock); | |
2370 | ret = lttcomm_create_sock(&relayd->control_sock); | |
2371 | if (ret < 0) { | |
2372 | goto error; | |
2373 | } | |
2374 | ||
2375 | /* Close the created socket fd which is useless */ | |
2376 | close(relayd->control_sock.fd); | |
2377 | ||
2378 | /* Assign new file descriptor */ | |
2379 | relayd->control_sock.fd = fd; | |
2380 | break; | |
2381 | case LTTNG_STREAM_DATA: | |
2382 | /* Copy received lttcomm socket */ | |
2383 | lttcomm_copy_sock(&relayd->data_sock, relayd_sock); | |
2384 | ret = lttcomm_create_sock(&relayd->data_sock); | |
2385 | if (ret < 0) { | |
2386 | goto error; | |
2387 | } | |
2388 | ||
2389 | /* Close the created socket fd which is useless */ | |
2390 | close(relayd->data_sock.fd); | |
2391 | ||
2392 | /* Assign new file descriptor */ | |
2393 | relayd->data_sock.fd = fd; | |
2394 | break; | |
2395 | default: | |
2396 | ERR("Unknown relayd socket type (%d)", sock_type); | |
2397 | goto error; | |
2398 | } | |
2399 | ||
2400 | DBG("Consumer %s socket created successfully with net idx %d (fd: %d)", | |
2401 | sock_type == LTTNG_STREAM_CONTROL ? "control" : "data", | |
2402 | relayd->net_seq_idx, fd); | |
2403 | ||
2404 | /* | |
2405 | * Add relayd socket pair to consumer data hashtable. If object already | |
2406 | * exists or on error, the function gracefully returns. | |
2407 | */ | |
d09e1200 | 2408 | add_relayd(relayd); |
7735ef9e DG |
2409 | |
2410 | /* All good! */ | |
2411 | ret = 0; | |
2412 | ||
2413 | error: | |
2414 | return ret; | |
2415 | } |