Commit | Line | Data |
---|---|---|
3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
00e2e675 | 4 | * 2012 - David Goulet <dgoulet@efficios.com> |
3bd1e081 | 5 | * |
d14d33bf AM |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License, version 2 only, | |
8 | * as published by the Free Software Foundation. | |
3bd1e081 | 9 | * |
d14d33bf AM |
10 | * This program is distributed in the hope that it will be useful, but WITHOUT |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
3bd1e081 | 14 | * |
d14d33bf AM |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
3bd1e081 MD |
18 | */ |
19 | ||
20 | #define _GNU_SOURCE | |
21 | #include <assert.h> | |
3bd1e081 MD |
22 | #include <poll.h> |
23 | #include <pthread.h> | |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | #include <sys/mman.h> | |
27 | #include <sys/socket.h> | |
28 | #include <sys/types.h> | |
29 | #include <unistd.h> | |
77c7c900 | 30 | #include <inttypes.h> |
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 | ||
61 | /* | |
62 | * Find a stream. The consumer_data.lock must be locked during this | |
63 | * call. | |
64 | */ | |
8389e4f8 DG |
65 | static struct lttng_consumer_stream *consumer_find_stream(int key, |
66 | struct lttng_ht *ht) | |
3bd1e081 | 67 | { |
e4421fec DG |
68 | struct lttng_ht_iter iter; |
69 | struct lttng_ht_node_ulong *node; | |
70 | struct lttng_consumer_stream *stream = NULL; | |
3bd1e081 | 71 | |
8389e4f8 DG |
72 | assert(ht); |
73 | ||
7ad0a0cb | 74 | /* Negative keys are lookup failures */ |
7a57cf92 | 75 | if (key < 0) { |
7ad0a0cb | 76 | return NULL; |
7a57cf92 | 77 | } |
e4421fec | 78 | |
6065ceec DG |
79 | rcu_read_lock(); |
80 | ||
8389e4f8 | 81 | lttng_ht_lookup(ht, (void *)((unsigned long) key), &iter); |
e4421fec DG |
82 | node = lttng_ht_iter_get_node_ulong(&iter); |
83 | if (node != NULL) { | |
84 | stream = caa_container_of(node, struct lttng_consumer_stream, node); | |
3bd1e081 | 85 | } |
e4421fec | 86 | |
6065ceec DG |
87 | rcu_read_unlock(); |
88 | ||
e4421fec | 89 | return stream; |
3bd1e081 MD |
90 | } |
91 | ||
8389e4f8 | 92 | static void consumer_steal_stream_key(int key, struct lttng_ht *ht) |
7ad0a0cb MD |
93 | { |
94 | struct lttng_consumer_stream *stream; | |
95 | ||
04253271 | 96 | rcu_read_lock(); |
8389e4f8 | 97 | stream = consumer_find_stream(key, ht); |
04253271 | 98 | if (stream) { |
7ad0a0cb | 99 | stream->key = -1; |
04253271 MD |
100 | /* |
101 | * We don't want the lookup to match, but we still need | |
102 | * to iterate on this stream when iterating over the hash table. Just | |
103 | * change the node key. | |
104 | */ | |
105 | stream->node.key = -1; | |
106 | } | |
107 | rcu_read_unlock(); | |
7ad0a0cb MD |
108 | } |
109 | ||
3bd1e081 MD |
110 | static struct lttng_consumer_channel *consumer_find_channel(int key) |
111 | { | |
e4421fec DG |
112 | struct lttng_ht_iter iter; |
113 | struct lttng_ht_node_ulong *node; | |
114 | struct lttng_consumer_channel *channel = NULL; | |
3bd1e081 | 115 | |
7ad0a0cb | 116 | /* Negative keys are lookup failures */ |
7a57cf92 | 117 | if (key < 0) { |
7ad0a0cb | 118 | return NULL; |
7a57cf92 | 119 | } |
e4421fec | 120 | |
6065ceec DG |
121 | rcu_read_lock(); |
122 | ||
e4421fec DG |
123 | lttng_ht_lookup(consumer_data.channel_ht, (void *)((unsigned long) key), |
124 | &iter); | |
125 | node = lttng_ht_iter_get_node_ulong(&iter); | |
126 | if (node != NULL) { | |
127 | channel = caa_container_of(node, struct lttng_consumer_channel, node); | |
3bd1e081 | 128 | } |
e4421fec | 129 | |
6065ceec DG |
130 | rcu_read_unlock(); |
131 | ||
e4421fec | 132 | return channel; |
3bd1e081 MD |
133 | } |
134 | ||
7ad0a0cb MD |
135 | static void consumer_steal_channel_key(int key) |
136 | { | |
137 | struct lttng_consumer_channel *channel; | |
138 | ||
04253271 | 139 | rcu_read_lock(); |
7ad0a0cb | 140 | channel = consumer_find_channel(key); |
04253271 | 141 | if (channel) { |
7ad0a0cb | 142 | channel->key = -1; |
04253271 MD |
143 | /* |
144 | * We don't want the lookup to match, but we still need | |
145 | * to iterate on this channel when iterating over the hash table. Just | |
146 | * change the node key. | |
147 | */ | |
148 | channel->node.key = -1; | |
149 | } | |
150 | rcu_read_unlock(); | |
7ad0a0cb MD |
151 | } |
152 | ||
702b1ea4 MD |
153 | static |
154 | void consumer_free_stream(struct rcu_head *head) | |
155 | { | |
156 | struct lttng_ht_node_ulong *node = | |
157 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
158 | struct lttng_consumer_stream *stream = | |
159 | caa_container_of(node, struct lttng_consumer_stream, node); | |
160 | ||
161 | free(stream); | |
162 | } | |
163 | ||
00e2e675 DG |
164 | /* |
165 | * RCU protected relayd socket pair free. | |
166 | */ | |
167 | static void consumer_rcu_free_relayd(struct rcu_head *head) | |
168 | { | |
169 | struct lttng_ht_node_ulong *node = | |
170 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
171 | struct consumer_relayd_sock_pair *relayd = | |
172 | caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
173 | ||
174 | free(relayd); | |
175 | } | |
176 | ||
177 | /* | |
178 | * Destroy and free relayd socket pair object. | |
179 | * | |
180 | * This function MUST be called with the consumer_data lock acquired. | |
181 | */ | |
d09e1200 | 182 | static void destroy_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
183 | { |
184 | int ret; | |
185 | struct lttng_ht_iter iter; | |
186 | ||
173af62f DG |
187 | if (relayd == NULL) { |
188 | return; | |
189 | } | |
190 | ||
00e2e675 DG |
191 | DBG("Consumer destroy and close relayd socket pair"); |
192 | ||
193 | iter.iter.node = &relayd->node.node; | |
194 | ret = lttng_ht_del(consumer_data.relayd_ht, &iter); | |
173af62f DG |
195 | if (ret != 0) { |
196 | /* We assume the relayd was already destroyed */ | |
197 | return; | |
198 | } | |
00e2e675 DG |
199 | |
200 | /* Close all sockets */ | |
201 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
202 | (void) relayd_close(&relayd->control_sock); | |
203 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
204 | (void) relayd_close(&relayd->data_sock); | |
205 | ||
206 | /* RCU free() call */ | |
207 | call_rcu(&relayd->node.head, consumer_rcu_free_relayd); | |
208 | } | |
209 | ||
a6ba4fe1 DG |
210 | /* |
211 | * Flag a relayd socket pair for destruction. Destroy it if the refcount | |
212 | * reaches zero. | |
213 | * | |
214 | * RCU read side lock MUST be aquired before calling this function. | |
215 | */ | |
216 | void consumer_flag_relayd_for_destroy(struct consumer_relayd_sock_pair *relayd) | |
217 | { | |
218 | assert(relayd); | |
219 | ||
220 | /* Set destroy flag for this object */ | |
221 | uatomic_set(&relayd->destroy_flag, 1); | |
222 | ||
223 | /* Destroy the relayd if refcount is 0 */ | |
224 | if (uatomic_read(&relayd->refcount) == 0) { | |
d09e1200 | 225 | destroy_relayd(relayd); |
a6ba4fe1 DG |
226 | } |
227 | } | |
228 | ||
3bd1e081 MD |
229 | /* |
230 | * Remove a stream from the global list protected by a mutex. This | |
231 | * function is also responsible for freeing its data structures. | |
232 | */ | |
233 | void consumer_del_stream(struct lttng_consumer_stream *stream) | |
234 | { | |
235 | int ret; | |
e4421fec | 236 | struct lttng_ht_iter iter; |
3bd1e081 | 237 | struct lttng_consumer_channel *free_chan = NULL; |
00e2e675 DG |
238 | struct consumer_relayd_sock_pair *relayd; |
239 | ||
240 | assert(stream); | |
3bd1e081 MD |
241 | |
242 | pthread_mutex_lock(&consumer_data.lock); | |
243 | ||
244 | switch (consumer_data.type) { | |
245 | case LTTNG_CONSUMER_KERNEL: | |
246 | if (stream->mmap_base != NULL) { | |
247 | ret = munmap(stream->mmap_base, stream->mmap_len); | |
248 | if (ret != 0) { | |
7a57cf92 | 249 | PERROR("munmap"); |
3bd1e081 MD |
250 | } |
251 | } | |
252 | break; | |
7753dea8 MD |
253 | case LTTNG_CONSUMER32_UST: |
254 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
255 | lttng_ustconsumer_del_stream(stream); |
256 | break; | |
257 | default: | |
258 | ERR("Unknown consumer_data type"); | |
259 | assert(0); | |
260 | goto end; | |
261 | } | |
262 | ||
6065ceec | 263 | rcu_read_lock(); |
04253271 MD |
264 | iter.iter.node = &stream->node.node; |
265 | ret = lttng_ht_del(consumer_data.stream_ht, &iter); | |
266 | assert(!ret); | |
e4421fec | 267 | |
6065ceec DG |
268 | rcu_read_unlock(); |
269 | ||
3bd1e081 MD |
270 | if (consumer_data.stream_count <= 0) { |
271 | goto end; | |
272 | } | |
273 | consumer_data.stream_count--; | |
274 | if (!stream) { | |
275 | goto end; | |
276 | } | |
277 | if (stream->out_fd >= 0) { | |
4c462e79 MD |
278 | ret = close(stream->out_fd); |
279 | if (ret) { | |
280 | PERROR("close"); | |
281 | } | |
3bd1e081 | 282 | } |
b5c5fc29 | 283 | if (stream->wait_fd >= 0 && !stream->wait_fd_is_copy) { |
4c462e79 MD |
284 | ret = close(stream->wait_fd); |
285 | if (ret) { | |
286 | PERROR("close"); | |
287 | } | |
3bd1e081 | 288 | } |
2c1dd183 | 289 | if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) { |
4c462e79 MD |
290 | ret = close(stream->shm_fd); |
291 | if (ret) { | |
292 | PERROR("close"); | |
293 | } | |
3bd1e081 | 294 | } |
00e2e675 DG |
295 | |
296 | /* Check and cleanup relayd */ | |
b0b335c8 | 297 | rcu_read_lock(); |
00e2e675 DG |
298 | relayd = consumer_find_relayd(stream->net_seq_idx); |
299 | if (relayd != NULL) { | |
b0b335c8 MD |
300 | uatomic_dec(&relayd->refcount); |
301 | assert(uatomic_read(&relayd->refcount) >= 0); | |
173af62f | 302 | |
3f8e211f DG |
303 | /* Closing streams requires to lock the control socket. */ |
304 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
173af62f DG |
305 | ret = relayd_send_close_stream(&relayd->control_sock, |
306 | stream->relayd_stream_id, | |
307 | stream->next_net_seq_num - 1); | |
3f8e211f | 308 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); |
173af62f | 309 | if (ret < 0) { |
a4b92340 DG |
310 | DBG("Unable to close stream on the relayd. Continuing"); |
311 | /* | |
312 | * Continue here. There is nothing we can do for the relayd. | |
313 | * Chances are that the relayd has closed the socket so we just | |
314 | * continue cleaning up. | |
315 | */ | |
173af62f DG |
316 | } |
317 | ||
318 | /* Both conditions are met, we destroy the relayd. */ | |
319 | if (uatomic_read(&relayd->refcount) == 0 && | |
320 | uatomic_read(&relayd->destroy_flag)) { | |
d09e1200 | 321 | destroy_relayd(relayd); |
00e2e675 | 322 | } |
00e2e675 | 323 | } |
b0b335c8 | 324 | rcu_read_unlock(); |
00e2e675 | 325 | |
c30aaa51 MD |
326 | uatomic_dec(&stream->chan->refcount); |
327 | if (!uatomic_read(&stream->chan->refcount) | |
328 | && !uatomic_read(&stream->chan->nb_init_streams)) { | |
3bd1e081 | 329 | free_chan = stream->chan; |
00e2e675 DG |
330 | } |
331 | ||
702b1ea4 | 332 | call_rcu(&stream->node.head, consumer_free_stream); |
3bd1e081 MD |
333 | end: |
334 | consumer_data.need_update = 1; | |
335 | pthread_mutex_unlock(&consumer_data.lock); | |
336 | ||
c30aaa51 | 337 | if (free_chan) { |
3bd1e081 | 338 | consumer_del_channel(free_chan); |
c30aaa51 | 339 | } |
3bd1e081 MD |
340 | } |
341 | ||
342 | struct lttng_consumer_stream *consumer_allocate_stream( | |
343 | int channel_key, int stream_key, | |
344 | int shm_fd, int wait_fd, | |
345 | enum lttng_consumer_stream_state state, | |
346 | uint64_t mmap_len, | |
347 | enum lttng_event_output output, | |
6df2e2c9 MD |
348 | const char *path_name, |
349 | uid_t uid, | |
00e2e675 DG |
350 | gid_t gid, |
351 | int net_index, | |
c80048c6 MD |
352 | int metadata_flag, |
353 | int *alloc_ret) | |
3bd1e081 MD |
354 | { |
355 | struct lttng_consumer_stream *stream; | |
356 | int ret; | |
357 | ||
effcf122 | 358 | stream = zmalloc(sizeof(*stream)); |
3bd1e081 | 359 | if (stream == NULL) { |
7a57cf92 | 360 | PERROR("malloc struct lttng_consumer_stream"); |
c80048c6 | 361 | *alloc_ret = -ENOMEM; |
7a57cf92 | 362 | goto end; |
3bd1e081 | 363 | } |
7a57cf92 DG |
364 | |
365 | /* | |
366 | * Get stream's channel reference. Needed when adding the stream to the | |
367 | * global hash table. | |
368 | */ | |
3bd1e081 MD |
369 | stream->chan = consumer_find_channel(channel_key); |
370 | if (!stream->chan) { | |
c80048c6 | 371 | *alloc_ret = -ENOENT; |
7a57cf92 | 372 | ERR("Unable to find channel for stream %d", stream_key); |
c80048c6 | 373 | goto error; |
3bd1e081 MD |
374 | } |
375 | stream->chan->refcount++; | |
376 | stream->key = stream_key; | |
377 | stream->shm_fd = shm_fd; | |
378 | stream->wait_fd = wait_fd; | |
379 | stream->out_fd = -1; | |
380 | stream->out_fd_offset = 0; | |
381 | stream->state = state; | |
382 | stream->mmap_len = mmap_len; | |
383 | stream->mmap_base = NULL; | |
384 | stream->output = output; | |
6df2e2c9 MD |
385 | stream->uid = uid; |
386 | stream->gid = gid; | |
00e2e675 DG |
387 | stream->net_seq_idx = net_index; |
388 | stream->metadata_flag = metadata_flag; | |
389 | strncpy(stream->path_name, path_name, sizeof(stream->path_name)); | |
390 | stream->path_name[sizeof(stream->path_name) - 1] = '\0'; | |
e4421fec | 391 | lttng_ht_node_init_ulong(&stream->node, stream->key); |
00e2e675 | 392 | lttng_ht_node_init_ulong(&stream->waitfd_node, stream->wait_fd); |
3bd1e081 MD |
393 | |
394 | switch (consumer_data.type) { | |
395 | case LTTNG_CONSUMER_KERNEL: | |
396 | break; | |
7753dea8 MD |
397 | case LTTNG_CONSUMER32_UST: |
398 | case LTTNG_CONSUMER64_UST: | |
5af2f756 | 399 | stream->cpu = stream->chan->cpucount++; |
3bd1e081 MD |
400 | ret = lttng_ustconsumer_allocate_stream(stream); |
401 | if (ret) { | |
c80048c6 MD |
402 | *alloc_ret = -EINVAL; |
403 | goto error; | |
3bd1e081 MD |
404 | } |
405 | break; | |
406 | default: | |
407 | ERR("Unknown consumer_data type"); | |
c80048c6 MD |
408 | *alloc_ret = -EINVAL; |
409 | goto error; | |
3bd1e081 | 410 | } |
c30aaa51 MD |
411 | |
412 | /* | |
413 | * When nb_init_streams reaches 0, we don't need to trigger any action in | |
414 | * terms of destroying the associated channel, because the action that | |
415 | * causes the count to become 0 also causes a stream to be added. The | |
416 | * channel deletion will thus be triggered by the following removal of this | |
417 | * stream. | |
418 | */ | |
419 | if (uatomic_read(&stream->chan->nb_init_streams) > 0) { | |
420 | uatomic_dec(&stream->chan->nb_init_streams); | |
421 | } | |
422 | ||
423 | DBG3("Allocated stream %s (key %d, shm_fd %d, wait_fd %d, mmap_len %llu," | |
424 | " out_fd %d, net_seq_idx %d)", stream->path_name, stream->key, | |
425 | stream->shm_fd, stream->wait_fd, | |
426 | (unsigned long long) stream->mmap_len, stream->out_fd, | |
00e2e675 | 427 | stream->net_seq_idx); |
3bd1e081 | 428 | return stream; |
c80048c6 MD |
429 | |
430 | error: | |
431 | free(stream); | |
7a57cf92 | 432 | end: |
c80048c6 | 433 | return NULL; |
3bd1e081 MD |
434 | } |
435 | ||
436 | /* | |
437 | * Add a stream to the global list protected by a mutex. | |
438 | */ | |
439 | int consumer_add_stream(struct lttng_consumer_stream *stream) | |
440 | { | |
441 | int ret = 0; | |
c77fc10a DG |
442 | struct lttng_ht_node_ulong *node; |
443 | struct lttng_ht_iter iter; | |
00e2e675 | 444 | struct consumer_relayd_sock_pair *relayd; |
3bd1e081 MD |
445 | |
446 | pthread_mutex_lock(&consumer_data.lock); | |
7ad0a0cb | 447 | /* Steal stream identifier, for UST */ |
8389e4f8 | 448 | consumer_steal_stream_key(stream->key, consumer_data.stream_ht); |
c77fc10a | 449 | |
b0b335c8 | 450 | rcu_read_lock(); |
c77fc10a DG |
451 | lttng_ht_lookup(consumer_data.stream_ht, |
452 | (void *)((unsigned long) stream->key), &iter); | |
453 | node = lttng_ht_iter_get_node_ulong(&iter); | |
454 | if (node != NULL) { | |
455 | rcu_read_unlock(); | |
456 | /* Stream already exist. Ignore the insertion */ | |
457 | goto end; | |
458 | } | |
459 | ||
04253271 | 460 | lttng_ht_add_unique_ulong(consumer_data.stream_ht, &stream->node); |
00e2e675 DG |
461 | |
462 | /* Check and cleanup relayd */ | |
463 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
464 | if (relayd != NULL) { | |
b0b335c8 | 465 | uatomic_inc(&relayd->refcount); |
00e2e675 | 466 | } |
b0b335c8 | 467 | rcu_read_unlock(); |
00e2e675 DG |
468 | |
469 | /* Update consumer data */ | |
3bd1e081 MD |
470 | consumer_data.stream_count++; |
471 | consumer_data.need_update = 1; | |
472 | ||
3bd1e081 MD |
473 | end: |
474 | pthread_mutex_unlock(&consumer_data.lock); | |
702b1ea4 | 475 | |
3bd1e081 MD |
476 | return ret; |
477 | } | |
478 | ||
00e2e675 | 479 | /* |
3f8e211f DG |
480 | * Add relayd socket to global consumer data hashtable. RCU read side lock MUST |
481 | * be acquired before calling this. | |
00e2e675 | 482 | */ |
d09e1200 | 483 | static int add_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
484 | { |
485 | int ret = 0; | |
486 | struct lttng_ht_node_ulong *node; | |
487 | struct lttng_ht_iter iter; | |
488 | ||
489 | if (relayd == NULL) { | |
490 | ret = -1; | |
491 | goto end; | |
492 | } | |
493 | ||
00e2e675 DG |
494 | lttng_ht_lookup(consumer_data.relayd_ht, |
495 | (void *)((unsigned long) relayd->net_seq_idx), &iter); | |
496 | node = lttng_ht_iter_get_node_ulong(&iter); | |
497 | if (node != NULL) { | |
00e2e675 DG |
498 | /* Relayd already exist. Ignore the insertion */ |
499 | goto end; | |
500 | } | |
501 | lttng_ht_add_unique_ulong(consumer_data.relayd_ht, &relayd->node); | |
502 | ||
00e2e675 DG |
503 | end: |
504 | return ret; | |
505 | } | |
506 | ||
507 | /* | |
508 | * Allocate and return a consumer relayd socket. | |
509 | */ | |
510 | struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair( | |
511 | int net_seq_idx) | |
512 | { | |
513 | struct consumer_relayd_sock_pair *obj = NULL; | |
514 | ||
515 | /* Negative net sequence index is a failure */ | |
516 | if (net_seq_idx < 0) { | |
517 | goto error; | |
518 | } | |
519 | ||
520 | obj = zmalloc(sizeof(struct consumer_relayd_sock_pair)); | |
521 | if (obj == NULL) { | |
522 | PERROR("zmalloc relayd sock"); | |
523 | goto error; | |
524 | } | |
525 | ||
526 | obj->net_seq_idx = net_seq_idx; | |
527 | obj->refcount = 0; | |
173af62f | 528 | obj->destroy_flag = 0; |
00e2e675 DG |
529 | lttng_ht_node_init_ulong(&obj->node, obj->net_seq_idx); |
530 | pthread_mutex_init(&obj->ctrl_sock_mutex, NULL); | |
531 | ||
532 | error: | |
533 | return obj; | |
534 | } | |
535 | ||
536 | /* | |
537 | * Find a relayd socket pair in the global consumer data. | |
538 | * | |
539 | * Return the object if found else NULL. | |
b0b335c8 MD |
540 | * RCU read-side lock must be held across this call and while using the |
541 | * returned object. | |
00e2e675 DG |
542 | */ |
543 | struct consumer_relayd_sock_pair *consumer_find_relayd(int key) | |
544 | { | |
545 | struct lttng_ht_iter iter; | |
546 | struct lttng_ht_node_ulong *node; | |
547 | struct consumer_relayd_sock_pair *relayd = NULL; | |
548 | ||
549 | /* Negative keys are lookup failures */ | |
550 | if (key < 0) { | |
551 | goto error; | |
552 | } | |
553 | ||
00e2e675 DG |
554 | lttng_ht_lookup(consumer_data.relayd_ht, (void *)((unsigned long) key), |
555 | &iter); | |
556 | node = lttng_ht_iter_get_node_ulong(&iter); | |
557 | if (node != NULL) { | |
558 | relayd = caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
559 | } | |
560 | ||
00e2e675 DG |
561 | error: |
562 | return relayd; | |
563 | } | |
564 | ||
565 | /* | |
566 | * Handle stream for relayd transmission if the stream applies for network | |
567 | * streaming where the net sequence index is set. | |
568 | * | |
569 | * Return destination file descriptor or negative value on error. | |
570 | */ | |
6197aea7 | 571 | static int write_relayd_stream_header(struct lttng_consumer_stream *stream, |
1d4dfdef DG |
572 | size_t data_size, unsigned long padding, |
573 | struct consumer_relayd_sock_pair *relayd) | |
00e2e675 DG |
574 | { |
575 | int outfd = -1, ret; | |
00e2e675 DG |
576 | struct lttcomm_relayd_data_hdr data_hdr; |
577 | ||
578 | /* Safety net */ | |
579 | assert(stream); | |
6197aea7 | 580 | assert(relayd); |
00e2e675 DG |
581 | |
582 | /* Reset data header */ | |
583 | memset(&data_hdr, 0, sizeof(data_hdr)); | |
584 | ||
00e2e675 DG |
585 | if (stream->metadata_flag) { |
586 | /* Caller MUST acquire the relayd control socket lock */ | |
587 | ret = relayd_send_metadata(&relayd->control_sock, data_size); | |
588 | if (ret < 0) { | |
589 | goto error; | |
590 | } | |
591 | ||
592 | /* Metadata are always sent on the control socket. */ | |
593 | outfd = relayd->control_sock.fd; | |
594 | } else { | |
595 | /* Set header with stream information */ | |
596 | data_hdr.stream_id = htobe64(stream->relayd_stream_id); | |
597 | data_hdr.data_size = htobe32(data_size); | |
1d4dfdef | 598 | data_hdr.padding_size = htobe32(padding); |
173af62f | 599 | data_hdr.net_seq_num = htobe64(stream->next_net_seq_num++); |
00e2e675 DG |
600 | /* Other fields are zeroed previously */ |
601 | ||
602 | ret = relayd_send_data_hdr(&relayd->data_sock, &data_hdr, | |
603 | sizeof(data_hdr)); | |
604 | if (ret < 0) { | |
605 | goto error; | |
606 | } | |
607 | ||
608 | /* Set to go on data socket */ | |
609 | outfd = relayd->data_sock.fd; | |
610 | } | |
611 | ||
612 | error: | |
613 | return outfd; | |
614 | } | |
615 | ||
3bd1e081 MD |
616 | /* |
617 | * Update a stream according to what we just received. | |
618 | */ | |
619 | void consumer_change_stream_state(int stream_key, | |
620 | enum lttng_consumer_stream_state state) | |
621 | { | |
622 | struct lttng_consumer_stream *stream; | |
623 | ||
624 | pthread_mutex_lock(&consumer_data.lock); | |
8389e4f8 | 625 | stream = consumer_find_stream(stream_key, consumer_data.stream_ht); |
3bd1e081 MD |
626 | if (stream) { |
627 | stream->state = state; | |
628 | } | |
629 | consumer_data.need_update = 1; | |
630 | pthread_mutex_unlock(&consumer_data.lock); | |
631 | } | |
632 | ||
702b1ea4 MD |
633 | static |
634 | void consumer_free_channel(struct rcu_head *head) | |
635 | { | |
636 | struct lttng_ht_node_ulong *node = | |
637 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
638 | struct lttng_consumer_channel *channel = | |
639 | caa_container_of(node, struct lttng_consumer_channel, node); | |
640 | ||
641 | free(channel); | |
642 | } | |
643 | ||
3bd1e081 MD |
644 | /* |
645 | * Remove a channel from the global list protected by a mutex. This | |
646 | * function is also responsible for freeing its data structures. | |
647 | */ | |
648 | void consumer_del_channel(struct lttng_consumer_channel *channel) | |
649 | { | |
650 | int ret; | |
e4421fec | 651 | struct lttng_ht_iter iter; |
3bd1e081 MD |
652 | |
653 | pthread_mutex_lock(&consumer_data.lock); | |
654 | ||
655 | switch (consumer_data.type) { | |
656 | case LTTNG_CONSUMER_KERNEL: | |
657 | break; | |
7753dea8 MD |
658 | case LTTNG_CONSUMER32_UST: |
659 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
660 | lttng_ustconsumer_del_channel(channel); |
661 | break; | |
662 | default: | |
663 | ERR("Unknown consumer_data type"); | |
664 | assert(0); | |
665 | goto end; | |
666 | } | |
667 | ||
6065ceec | 668 | rcu_read_lock(); |
04253271 MD |
669 | iter.iter.node = &channel->node.node; |
670 | ret = lttng_ht_del(consumer_data.channel_ht, &iter); | |
671 | assert(!ret); | |
6065ceec DG |
672 | rcu_read_unlock(); |
673 | ||
3bd1e081 MD |
674 | if (channel->mmap_base != NULL) { |
675 | ret = munmap(channel->mmap_base, channel->mmap_len); | |
676 | if (ret != 0) { | |
7a57cf92 | 677 | PERROR("munmap"); |
3bd1e081 MD |
678 | } |
679 | } | |
b5c5fc29 | 680 | if (channel->wait_fd >= 0 && !channel->wait_fd_is_copy) { |
4c462e79 MD |
681 | ret = close(channel->wait_fd); |
682 | if (ret) { | |
683 | PERROR("close"); | |
684 | } | |
3bd1e081 | 685 | } |
2c1dd183 | 686 | if (channel->shm_fd >= 0 && channel->wait_fd != channel->shm_fd) { |
4c462e79 MD |
687 | ret = close(channel->shm_fd); |
688 | if (ret) { | |
689 | PERROR("close"); | |
690 | } | |
3bd1e081 | 691 | } |
702b1ea4 MD |
692 | |
693 | call_rcu(&channel->node.head, consumer_free_channel); | |
3bd1e081 MD |
694 | end: |
695 | pthread_mutex_unlock(&consumer_data.lock); | |
696 | } | |
697 | ||
698 | struct lttng_consumer_channel *consumer_allocate_channel( | |
699 | int channel_key, | |
700 | int shm_fd, int wait_fd, | |
701 | uint64_t mmap_len, | |
c30aaa51 MD |
702 | uint64_t max_sb_size, |
703 | unsigned int nb_init_streams) | |
3bd1e081 MD |
704 | { |
705 | struct lttng_consumer_channel *channel; | |
706 | int ret; | |
707 | ||
276b26d1 | 708 | channel = zmalloc(sizeof(*channel)); |
3bd1e081 | 709 | if (channel == NULL) { |
7a57cf92 | 710 | PERROR("malloc struct lttng_consumer_channel"); |
3bd1e081 MD |
711 | goto end; |
712 | } | |
713 | channel->key = channel_key; | |
714 | channel->shm_fd = shm_fd; | |
715 | channel->wait_fd = wait_fd; | |
716 | channel->mmap_len = mmap_len; | |
717 | channel->max_sb_size = max_sb_size; | |
718 | channel->refcount = 0; | |
c30aaa51 | 719 | channel->nb_init_streams = nb_init_streams; |
e4421fec | 720 | lttng_ht_node_init_ulong(&channel->node, channel->key); |
3bd1e081 MD |
721 | |
722 | switch (consumer_data.type) { | |
723 | case LTTNG_CONSUMER_KERNEL: | |
724 | channel->mmap_base = NULL; | |
725 | channel->mmap_len = 0; | |
726 | break; | |
7753dea8 MD |
727 | case LTTNG_CONSUMER32_UST: |
728 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
729 | ret = lttng_ustconsumer_allocate_channel(channel); |
730 | if (ret) { | |
731 | free(channel); | |
732 | return NULL; | |
733 | } | |
734 | break; | |
735 | default: | |
736 | ERR("Unknown consumer_data type"); | |
737 | assert(0); | |
738 | goto end; | |
739 | } | |
740 | DBG("Allocated channel (key %d, shm_fd %d, wait_fd %d, mmap_len %llu, max_sb_size %llu)", | |
00e2e675 | 741 | channel->key, channel->shm_fd, channel->wait_fd, |
3bd1e081 MD |
742 | (unsigned long long) channel->mmap_len, |
743 | (unsigned long long) channel->max_sb_size); | |
744 | end: | |
745 | return channel; | |
746 | } | |
747 | ||
748 | /* | |
749 | * Add a channel to the global list protected by a mutex. | |
750 | */ | |
751 | int consumer_add_channel(struct lttng_consumer_channel *channel) | |
752 | { | |
c77fc10a DG |
753 | struct lttng_ht_node_ulong *node; |
754 | struct lttng_ht_iter iter; | |
755 | ||
3bd1e081 | 756 | pthread_mutex_lock(&consumer_data.lock); |
7ad0a0cb MD |
757 | /* Steal channel identifier, for UST */ |
758 | consumer_steal_channel_key(channel->key); | |
6065ceec | 759 | rcu_read_lock(); |
c77fc10a DG |
760 | |
761 | lttng_ht_lookup(consumer_data.channel_ht, | |
762 | (void *)((unsigned long) channel->key), &iter); | |
763 | node = lttng_ht_iter_get_node_ulong(&iter); | |
764 | if (node != NULL) { | |
765 | /* Channel already exist. Ignore the insertion */ | |
766 | goto end; | |
767 | } | |
768 | ||
04253271 | 769 | lttng_ht_add_unique_ulong(consumer_data.channel_ht, &channel->node); |
c77fc10a DG |
770 | |
771 | end: | |
6065ceec | 772 | rcu_read_unlock(); |
3bd1e081 | 773 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 774 | |
7ad0a0cb | 775 | return 0; |
3bd1e081 MD |
776 | } |
777 | ||
778 | /* | |
779 | * Allocate the pollfd structure and the local view of the out fds to avoid | |
780 | * doing a lookup in the linked list and concurrency issues when writing is | |
781 | * needed. Called with consumer_data.lock held. | |
782 | * | |
783 | * Returns the number of fds in the structures. | |
784 | */ | |
785 | int consumer_update_poll_array( | |
786 | struct lttng_consumer_local_data *ctx, struct pollfd **pollfd, | |
fb3a43a9 | 787 | struct lttng_consumer_stream **local_stream) |
3bd1e081 | 788 | { |
3bd1e081 | 789 | int i = 0; |
e4421fec DG |
790 | struct lttng_ht_iter iter; |
791 | struct lttng_consumer_stream *stream; | |
3bd1e081 MD |
792 | |
793 | DBG("Updating poll fd array"); | |
481d6c57 | 794 | rcu_read_lock(); |
e4421fec DG |
795 | cds_lfht_for_each_entry(consumer_data.stream_ht->ht, &iter.iter, stream, |
796 | node.node) { | |
797 | if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM) { | |
3bd1e081 MD |
798 | continue; |
799 | } | |
e4421fec DG |
800 | DBG("Active FD %d", stream->wait_fd); |
801 | (*pollfd)[i].fd = stream->wait_fd; | |
3bd1e081 | 802 | (*pollfd)[i].events = POLLIN | POLLPRI; |
e4421fec | 803 | local_stream[i] = stream; |
3bd1e081 MD |
804 | i++; |
805 | } | |
481d6c57 | 806 | rcu_read_unlock(); |
3bd1e081 MD |
807 | |
808 | /* | |
809 | * Insert the consumer_poll_pipe at the end of the array and don't | |
810 | * increment i so nb_fd is the number of real FD. | |
811 | */ | |
812 | (*pollfd)[i].fd = ctx->consumer_poll_pipe[0]; | |
509bb1cf | 813 | (*pollfd)[i].events = POLLIN | POLLPRI; |
3bd1e081 MD |
814 | return i; |
815 | } | |
816 | ||
817 | /* | |
818 | * Poll on the should_quit pipe and the command socket return -1 on error and | |
819 | * should exit, 0 if data is available on the command socket | |
820 | */ | |
821 | int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll) | |
822 | { | |
823 | int num_rdy; | |
824 | ||
88f2b785 | 825 | restart: |
3bd1e081 MD |
826 | num_rdy = poll(consumer_sockpoll, 2, -1); |
827 | if (num_rdy == -1) { | |
88f2b785 MD |
828 | /* |
829 | * Restart interrupted system call. | |
830 | */ | |
831 | if (errno == EINTR) { | |
832 | goto restart; | |
833 | } | |
7a57cf92 | 834 | PERROR("Poll error"); |
3bd1e081 MD |
835 | goto exit; |
836 | } | |
509bb1cf | 837 | if (consumer_sockpoll[0].revents & (POLLIN | POLLPRI)) { |
3bd1e081 MD |
838 | DBG("consumer_should_quit wake up"); |
839 | goto exit; | |
840 | } | |
841 | return 0; | |
842 | ||
843 | exit: | |
844 | return -1; | |
845 | } | |
846 | ||
847 | /* | |
848 | * Set the error socket. | |
849 | */ | |
850 | void lttng_consumer_set_error_sock( | |
851 | struct lttng_consumer_local_data *ctx, int sock) | |
852 | { | |
853 | ctx->consumer_error_socket = sock; | |
854 | } | |
855 | ||
856 | /* | |
857 | * Set the command socket path. | |
858 | */ | |
3bd1e081 MD |
859 | void lttng_consumer_set_command_sock_path( |
860 | struct lttng_consumer_local_data *ctx, char *sock) | |
861 | { | |
862 | ctx->consumer_command_sock_path = sock; | |
863 | } | |
864 | ||
865 | /* | |
866 | * Send return code to the session daemon. | |
867 | * If the socket is not defined, we return 0, it is not a fatal error | |
868 | */ | |
869 | int lttng_consumer_send_error( | |
870 | struct lttng_consumer_local_data *ctx, int cmd) | |
871 | { | |
872 | if (ctx->consumer_error_socket > 0) { | |
873 | return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd, | |
874 | sizeof(enum lttcomm_sessiond_command)); | |
875 | } | |
876 | ||
877 | return 0; | |
878 | } | |
879 | ||
880 | /* | |
881 | * Close all the tracefiles and stream fds, should be called when all instances | |
882 | * are destroyed. | |
883 | */ | |
884 | void lttng_consumer_cleanup(void) | |
885 | { | |
e4421fec | 886 | struct lttng_ht_iter iter; |
6065ceec DG |
887 | struct lttng_ht_node_ulong *node; |
888 | ||
889 | rcu_read_lock(); | |
3bd1e081 MD |
890 | |
891 | /* | |
6065ceec DG |
892 | * close all outfd. Called when there are no more threads running (after |
893 | * joining on the threads), no need to protect list iteration with mutex. | |
3bd1e081 | 894 | */ |
6065ceec DG |
895 | cds_lfht_for_each_entry(consumer_data.stream_ht->ht, &iter.iter, node, |
896 | node) { | |
702b1ea4 MD |
897 | struct lttng_consumer_stream *stream = |
898 | caa_container_of(node, struct lttng_consumer_stream, node); | |
899 | consumer_del_stream(stream); | |
3bd1e081 | 900 | } |
e4421fec | 901 | |
6065ceec DG |
902 | cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, node, |
903 | node) { | |
702b1ea4 MD |
904 | struct lttng_consumer_channel *channel = |
905 | caa_container_of(node, struct lttng_consumer_channel, node); | |
906 | consumer_del_channel(channel); | |
3bd1e081 | 907 | } |
6065ceec DG |
908 | |
909 | rcu_read_unlock(); | |
d6ce1df2 MD |
910 | |
911 | lttng_ht_destroy(consumer_data.stream_ht); | |
912 | lttng_ht_destroy(consumer_data.channel_ht); | |
3bd1e081 MD |
913 | } |
914 | ||
915 | /* | |
916 | * Called from signal handler. | |
917 | */ | |
918 | void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx) | |
919 | { | |
920 | int ret; | |
921 | consumer_quit = 1; | |
6f94560a MD |
922 | do { |
923 | ret = write(ctx->consumer_should_quit[1], "4", 1); | |
924 | } while (ret < 0 && errno == EINTR); | |
3bd1e081 | 925 | if (ret < 0) { |
7a57cf92 | 926 | PERROR("write consumer quit"); |
3bd1e081 MD |
927 | } |
928 | } | |
929 | ||
00e2e675 DG |
930 | void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream, |
931 | off_t orig_offset) | |
3bd1e081 MD |
932 | { |
933 | int outfd = stream->out_fd; | |
934 | ||
935 | /* | |
936 | * This does a blocking write-and-wait on any page that belongs to the | |
937 | * subbuffer prior to the one we just wrote. | |
938 | * Don't care about error values, as these are just hints and ways to | |
939 | * limit the amount of page cache used. | |
940 | */ | |
941 | if (orig_offset < stream->chan->max_sb_size) { | |
942 | return; | |
943 | } | |
b9182dd9 | 944 | lttng_sync_file_range(outfd, orig_offset - stream->chan->max_sb_size, |
3bd1e081 MD |
945 | stream->chan->max_sb_size, |
946 | SYNC_FILE_RANGE_WAIT_BEFORE | |
947 | | SYNC_FILE_RANGE_WRITE | |
948 | | SYNC_FILE_RANGE_WAIT_AFTER); | |
949 | /* | |
950 | * Give hints to the kernel about how we access the file: | |
951 | * POSIX_FADV_DONTNEED : we won't re-access data in a near future after | |
952 | * we write it. | |
953 | * | |
954 | * We need to call fadvise again after the file grows because the | |
955 | * kernel does not seem to apply fadvise to non-existing parts of the | |
956 | * file. | |
957 | * | |
958 | * Call fadvise _after_ having waited for the page writeback to | |
959 | * complete because the dirty page writeback semantic is not well | |
960 | * defined. So it can be expected to lead to lower throughput in | |
961 | * streaming. | |
962 | */ | |
963 | posix_fadvise(outfd, orig_offset - stream->chan->max_sb_size, | |
964 | stream->chan->max_sb_size, POSIX_FADV_DONTNEED); | |
965 | } | |
966 | ||
967 | /* | |
968 | * Initialise the necessary environnement : | |
969 | * - create a new context | |
970 | * - create the poll_pipe | |
971 | * - create the should_quit pipe (for signal handler) | |
972 | * - create the thread pipe (for splice) | |
973 | * | |
974 | * Takes a function pointer as argument, this function is called when data is | |
975 | * available on a buffer. This function is responsible to do the | |
976 | * kernctl_get_next_subbuf, read the data with mmap or splice depending on the | |
977 | * buffer configuration and then kernctl_put_next_subbuf at the end. | |
978 | * | |
979 | * Returns a pointer to the new context or NULL on error. | |
980 | */ | |
981 | struct lttng_consumer_local_data *lttng_consumer_create( | |
982 | enum lttng_consumer_type type, | |
4078b776 | 983 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
d41f73b7 | 984 | struct lttng_consumer_local_data *ctx), |
3bd1e081 MD |
985 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
986 | int (*recv_stream)(struct lttng_consumer_stream *stream), | |
987 | int (*update_stream)(int stream_key, uint32_t state)) | |
988 | { | |
989 | int ret, i; | |
990 | struct lttng_consumer_local_data *ctx; | |
991 | ||
992 | assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN || | |
993 | consumer_data.type == type); | |
994 | consumer_data.type = type; | |
995 | ||
effcf122 | 996 | ctx = zmalloc(sizeof(struct lttng_consumer_local_data)); |
3bd1e081 | 997 | if (ctx == NULL) { |
7a57cf92 | 998 | PERROR("allocating context"); |
3bd1e081 MD |
999 | goto error; |
1000 | } | |
1001 | ||
1002 | ctx->consumer_error_socket = -1; | |
1003 | /* assign the callbacks */ | |
1004 | ctx->on_buffer_ready = buffer_ready; | |
1005 | ctx->on_recv_channel = recv_channel; | |
1006 | ctx->on_recv_stream = recv_stream; | |
1007 | ctx->on_update_stream = update_stream; | |
1008 | ||
1009 | ret = pipe(ctx->consumer_poll_pipe); | |
1010 | if (ret < 0) { | |
7a57cf92 | 1011 | PERROR("Error creating poll pipe"); |
3bd1e081 MD |
1012 | goto error_poll_pipe; |
1013 | } | |
1014 | ||
04fdd819 MD |
1015 | /* set read end of the pipe to non-blocking */ |
1016 | ret = fcntl(ctx->consumer_poll_pipe[0], F_SETFL, O_NONBLOCK); | |
1017 | if (ret < 0) { | |
7a57cf92 | 1018 | PERROR("fcntl O_NONBLOCK"); |
04fdd819 MD |
1019 | goto error_poll_fcntl; |
1020 | } | |
1021 | ||
1022 | /* set write end of the pipe to non-blocking */ | |
1023 | ret = fcntl(ctx->consumer_poll_pipe[1], F_SETFL, O_NONBLOCK); | |
1024 | if (ret < 0) { | |
7a57cf92 | 1025 | PERROR("fcntl O_NONBLOCK"); |
04fdd819 MD |
1026 | goto error_poll_fcntl; |
1027 | } | |
1028 | ||
3bd1e081 MD |
1029 | ret = pipe(ctx->consumer_should_quit); |
1030 | if (ret < 0) { | |
7a57cf92 | 1031 | PERROR("Error creating recv pipe"); |
3bd1e081 MD |
1032 | goto error_quit_pipe; |
1033 | } | |
1034 | ||
1035 | ret = pipe(ctx->consumer_thread_pipe); | |
1036 | if (ret < 0) { | |
7a57cf92 | 1037 | PERROR("Error creating thread pipe"); |
3bd1e081 MD |
1038 | goto error_thread_pipe; |
1039 | } | |
1040 | ||
fb3a43a9 DG |
1041 | ret = utils_create_pipe(ctx->consumer_metadata_pipe); |
1042 | if (ret < 0) { | |
1043 | goto error_metadata_pipe; | |
1044 | } | |
3bd1e081 | 1045 | |
fb3a43a9 DG |
1046 | ret = utils_create_pipe(ctx->consumer_splice_metadata_pipe); |
1047 | if (ret < 0) { | |
1048 | goto error_splice_pipe; | |
1049 | } | |
1050 | ||
1051 | return ctx; | |
3bd1e081 | 1052 | |
fb3a43a9 DG |
1053 | error_splice_pipe: |
1054 | utils_close_pipe(ctx->consumer_metadata_pipe); | |
1055 | error_metadata_pipe: | |
1056 | utils_close_pipe(ctx->consumer_thread_pipe); | |
3bd1e081 MD |
1057 | error_thread_pipe: |
1058 | for (i = 0; i < 2; i++) { | |
1059 | int err; | |
1060 | ||
1061 | err = close(ctx->consumer_should_quit[i]); | |
4c462e79 MD |
1062 | if (err) { |
1063 | PERROR("close"); | |
1064 | } | |
3bd1e081 | 1065 | } |
04fdd819 | 1066 | error_poll_fcntl: |
3bd1e081 MD |
1067 | error_quit_pipe: |
1068 | for (i = 0; i < 2; i++) { | |
1069 | int err; | |
1070 | ||
1071 | err = close(ctx->consumer_poll_pipe[i]); | |
4c462e79 MD |
1072 | if (err) { |
1073 | PERROR("close"); | |
1074 | } | |
3bd1e081 MD |
1075 | } |
1076 | error_poll_pipe: | |
1077 | free(ctx); | |
1078 | error: | |
1079 | return NULL; | |
1080 | } | |
1081 | ||
1082 | /* | |
1083 | * Close all fds associated with the instance and free the context. | |
1084 | */ | |
1085 | void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx) | |
1086 | { | |
4c462e79 MD |
1087 | int ret; |
1088 | ||
1089 | ret = close(ctx->consumer_error_socket); | |
1090 | if (ret) { | |
1091 | PERROR("close"); | |
1092 | } | |
1093 | ret = close(ctx->consumer_thread_pipe[0]); | |
1094 | if (ret) { | |
1095 | PERROR("close"); | |
1096 | } | |
1097 | ret = close(ctx->consumer_thread_pipe[1]); | |
1098 | if (ret) { | |
1099 | PERROR("close"); | |
1100 | } | |
1101 | ret = close(ctx->consumer_poll_pipe[0]); | |
1102 | if (ret) { | |
1103 | PERROR("close"); | |
1104 | } | |
1105 | ret = close(ctx->consumer_poll_pipe[1]); | |
1106 | if (ret) { | |
1107 | PERROR("close"); | |
1108 | } | |
1109 | ret = close(ctx->consumer_should_quit[0]); | |
1110 | if (ret) { | |
1111 | PERROR("close"); | |
1112 | } | |
1113 | ret = close(ctx->consumer_should_quit[1]); | |
1114 | if (ret) { | |
1115 | PERROR("close"); | |
1116 | } | |
fb3a43a9 DG |
1117 | utils_close_pipe(ctx->consumer_splice_metadata_pipe); |
1118 | ||
3bd1e081 MD |
1119 | unlink(ctx->consumer_command_sock_path); |
1120 | free(ctx); | |
1121 | } | |
1122 | ||
6197aea7 DG |
1123 | /* |
1124 | * Write the metadata stream id on the specified file descriptor. | |
1125 | */ | |
1126 | static int write_relayd_metadata_id(int fd, | |
1127 | struct lttng_consumer_stream *stream, | |
1d4dfdef DG |
1128 | struct consumer_relayd_sock_pair *relayd, |
1129 | unsigned long padding) | |
6197aea7 DG |
1130 | { |
1131 | int ret; | |
1d4dfdef | 1132 | struct lttcomm_relayd_metadata_payload hdr; |
6197aea7 | 1133 | |
1d4dfdef DG |
1134 | hdr.stream_id = htobe64(stream->relayd_stream_id); |
1135 | hdr.padding_size = htobe32(padding); | |
6197aea7 | 1136 | do { |
1d4dfdef | 1137 | ret = write(fd, (void *) &hdr, sizeof(hdr)); |
6197aea7 DG |
1138 | } while (ret < 0 && errno == EINTR); |
1139 | if (ret < 0) { | |
1140 | PERROR("write metadata stream id"); | |
1141 | goto end; | |
1142 | } | |
1d4dfdef DG |
1143 | DBG("Metadata stream id %" PRIu64 " with padding %lu written before data", |
1144 | stream->relayd_stream_id, padding); | |
6197aea7 DG |
1145 | |
1146 | end: | |
1147 | return ret; | |
1148 | } | |
1149 | ||
3bd1e081 | 1150 | /* |
09e26845 DG |
1151 | * Mmap the ring buffer, read it and write the data to the tracefile. This is a |
1152 | * core function for writing trace buffers to either the local filesystem or | |
1153 | * the network. | |
1154 | * | |
1155 | * Careful review MUST be put if any changes occur! | |
3bd1e081 MD |
1156 | * |
1157 | * Returns the number of bytes written | |
1158 | */ | |
4078b776 | 1159 | ssize_t lttng_consumer_on_read_subbuffer_mmap( |
3bd1e081 | 1160 | struct lttng_consumer_local_data *ctx, |
1d4dfdef DG |
1161 | struct lttng_consumer_stream *stream, unsigned long len, |
1162 | unsigned long padding) | |
3bd1e081 | 1163 | { |
f02e1e8a DG |
1164 | unsigned long mmap_offset; |
1165 | ssize_t ret = 0, written = 0; | |
1166 | off_t orig_offset = stream->out_fd_offset; | |
1167 | /* Default is on the disk */ | |
1168 | int outfd = stream->out_fd; | |
f02e1e8a DG |
1169 | struct consumer_relayd_sock_pair *relayd = NULL; |
1170 | ||
1171 | /* RCU lock for the relayd pointer */ | |
1172 | rcu_read_lock(); | |
1173 | ||
1174 | /* Flag that the current stream if set for network streaming. */ | |
1175 | if (stream->net_seq_idx != -1) { | |
1176 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1177 | if (relayd == NULL) { | |
1178 | goto end; | |
1179 | } | |
1180 | } | |
1181 | ||
1182 | /* get the offset inside the fd to mmap */ | |
3bd1e081 MD |
1183 | switch (consumer_data.type) { |
1184 | case LTTNG_CONSUMER_KERNEL: | |
f02e1e8a DG |
1185 | ret = kernctl_get_mmap_read_offset(stream->wait_fd, &mmap_offset); |
1186 | break; | |
7753dea8 MD |
1187 | case LTTNG_CONSUMER32_UST: |
1188 | case LTTNG_CONSUMER64_UST: | |
f02e1e8a DG |
1189 | ret = lttng_ustctl_get_mmap_read_offset(stream->chan->handle, |
1190 | stream->buf, &mmap_offset); | |
1191 | break; | |
3bd1e081 MD |
1192 | default: |
1193 | ERR("Unknown consumer_data type"); | |
1194 | assert(0); | |
1195 | } | |
f02e1e8a DG |
1196 | if (ret != 0) { |
1197 | errno = -ret; | |
1198 | PERROR("tracer ctl get_mmap_read_offset"); | |
1199 | written = ret; | |
1200 | goto end; | |
1201 | } | |
b9182dd9 | 1202 | |
f02e1e8a DG |
1203 | /* Handle stream on the relayd if the output is on the network */ |
1204 | if (relayd) { | |
1205 | unsigned long netlen = len; | |
1206 | ||
1207 | /* | |
1208 | * Lock the control socket for the complete duration of the function | |
1209 | * since from this point on we will use the socket. | |
1210 | */ | |
1211 | if (stream->metadata_flag) { | |
1212 | /* Metadata requires the control socket. */ | |
1213 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1d4dfdef | 1214 | netlen += sizeof(struct lttcomm_relayd_metadata_payload); |
f02e1e8a DG |
1215 | } |
1216 | ||
1d4dfdef | 1217 | ret = write_relayd_stream_header(stream, netlen, padding, relayd); |
f02e1e8a DG |
1218 | if (ret >= 0) { |
1219 | /* Use the returned socket. */ | |
1220 | outfd = ret; | |
1221 | ||
1222 | /* Write metadata stream id before payload */ | |
1223 | if (stream->metadata_flag) { | |
1d4dfdef | 1224 | ret = write_relayd_metadata_id(outfd, stream, relayd, padding); |
f02e1e8a | 1225 | if (ret < 0) { |
f02e1e8a DG |
1226 | written = ret; |
1227 | goto end; | |
1228 | } | |
f02e1e8a DG |
1229 | } |
1230 | } | |
1231 | /* Else, use the default set before which is the filesystem. */ | |
1d4dfdef DG |
1232 | } else { |
1233 | /* No streaming, we have to set the len with the full padding */ | |
1234 | len += padding; | |
f02e1e8a DG |
1235 | } |
1236 | ||
1237 | while (len > 0) { | |
1238 | do { | |
1239 | ret = write(outfd, stream->mmap_base + mmap_offset, len); | |
1240 | } while (ret < 0 && errno == EINTR); | |
1d4dfdef | 1241 | DBG("Consumer mmap write() ret %zd (len %lu)", ret, len); |
f02e1e8a DG |
1242 | if (ret < 0) { |
1243 | PERROR("Error in file write"); | |
1244 | if (written == 0) { | |
1245 | written = ret; | |
1246 | } | |
1247 | goto end; | |
1248 | } else if (ret > len) { | |
77c7c900 | 1249 | PERROR("Error in file write (ret %zd > len %lu)", ret, len); |
f02e1e8a DG |
1250 | written += ret; |
1251 | goto end; | |
1252 | } else { | |
1253 | len -= ret; | |
1254 | mmap_offset += ret; | |
1255 | } | |
f02e1e8a DG |
1256 | |
1257 | /* This call is useless on a socket so better save a syscall. */ | |
1258 | if (!relayd) { | |
1259 | /* This won't block, but will start writeout asynchronously */ | |
1260 | lttng_sync_file_range(outfd, stream->out_fd_offset, ret, | |
1261 | SYNC_FILE_RANGE_WRITE); | |
1262 | stream->out_fd_offset += ret; | |
1263 | } | |
1264 | written += ret; | |
1265 | } | |
1266 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
1267 | ||
1268 | end: | |
1269 | /* Unlock only if ctrl socket used */ | |
1270 | if (relayd && stream->metadata_flag) { | |
1271 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1272 | } | |
1273 | ||
1274 | rcu_read_unlock(); | |
1275 | return written; | |
3bd1e081 MD |
1276 | } |
1277 | ||
1278 | /* | |
1279 | * Splice the data from the ring buffer to the tracefile. | |
1280 | * | |
1281 | * Returns the number of bytes spliced. | |
1282 | */ | |
4078b776 | 1283 | ssize_t lttng_consumer_on_read_subbuffer_splice( |
3bd1e081 | 1284 | struct lttng_consumer_local_data *ctx, |
1d4dfdef DG |
1285 | struct lttng_consumer_stream *stream, unsigned long len, |
1286 | unsigned long padding) | |
3bd1e081 | 1287 | { |
f02e1e8a DG |
1288 | ssize_t ret = 0, written = 0, ret_splice = 0; |
1289 | loff_t offset = 0; | |
1290 | off_t orig_offset = stream->out_fd_offset; | |
1291 | int fd = stream->wait_fd; | |
1292 | /* Default is on the disk */ | |
1293 | int outfd = stream->out_fd; | |
f02e1e8a | 1294 | struct consumer_relayd_sock_pair *relayd = NULL; |
fb3a43a9 | 1295 | int *splice_pipe; |
f02e1e8a | 1296 | |
3bd1e081 MD |
1297 | switch (consumer_data.type) { |
1298 | case LTTNG_CONSUMER_KERNEL: | |
f02e1e8a | 1299 | break; |
7753dea8 MD |
1300 | case LTTNG_CONSUMER32_UST: |
1301 | case LTTNG_CONSUMER64_UST: | |
f02e1e8a | 1302 | /* Not supported for user space tracing */ |
3bd1e081 MD |
1303 | return -ENOSYS; |
1304 | default: | |
1305 | ERR("Unknown consumer_data type"); | |
1306 | assert(0); | |
3bd1e081 MD |
1307 | } |
1308 | ||
f02e1e8a DG |
1309 | /* RCU lock for the relayd pointer */ |
1310 | rcu_read_lock(); | |
1311 | ||
1312 | /* Flag that the current stream if set for network streaming. */ | |
1313 | if (stream->net_seq_idx != -1) { | |
1314 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1315 | if (relayd == NULL) { | |
1316 | goto end; | |
1317 | } | |
1318 | } | |
1319 | ||
fb3a43a9 DG |
1320 | /* |
1321 | * Choose right pipe for splice. Metadata and trace data are handled by | |
1322 | * different threads hence the use of two pipes in order not to race or | |
1323 | * corrupt the written data. | |
1324 | */ | |
1325 | if (stream->metadata_flag) { | |
1326 | splice_pipe = ctx->consumer_splice_metadata_pipe; | |
1327 | } else { | |
1328 | splice_pipe = ctx->consumer_thread_pipe; | |
1329 | } | |
1330 | ||
f02e1e8a | 1331 | /* Write metadata stream id before payload */ |
1d4dfdef DG |
1332 | if (relayd) { |
1333 | int total_len = len; | |
f02e1e8a | 1334 | |
1d4dfdef DG |
1335 | if (stream->metadata_flag) { |
1336 | /* | |
1337 | * Lock the control socket for the complete duration of the function | |
1338 | * since from this point on we will use the socket. | |
1339 | */ | |
1340 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1341 | ||
1342 | ret = write_relayd_metadata_id(splice_pipe[1], stream, relayd, | |
1343 | padding); | |
1344 | if (ret < 0) { | |
1345 | written = ret; | |
1346 | goto end; | |
1347 | } | |
1348 | ||
1349 | total_len += sizeof(struct lttcomm_relayd_metadata_payload); | |
1350 | } | |
1351 | ||
1352 | ret = write_relayd_stream_header(stream, total_len, padding, relayd); | |
1353 | if (ret >= 0) { | |
1354 | /* Use the returned socket. */ | |
1355 | outfd = ret; | |
1356 | } else { | |
1357 | ERR("Remote relayd disconnected. Stopping"); | |
f02e1e8a DG |
1358 | goto end; |
1359 | } | |
1d4dfdef DG |
1360 | } else { |
1361 | /* No streaming, we have to set the len with the full padding */ | |
1362 | len += padding; | |
f02e1e8a DG |
1363 | } |
1364 | ||
1365 | while (len > 0) { | |
1d4dfdef DG |
1366 | DBG("splice chan to pipe offset %lu of len %lu (fd : %d, pipe: %d)", |
1367 | (unsigned long)offset, len, fd, splice_pipe[1]); | |
fb3a43a9 | 1368 | ret_splice = splice(fd, &offset, splice_pipe[1], NULL, len, |
f02e1e8a DG |
1369 | SPLICE_F_MOVE | SPLICE_F_MORE); |
1370 | DBG("splice chan to pipe, ret %zd", ret_splice); | |
1371 | if (ret_splice < 0) { | |
1372 | PERROR("Error in relay splice"); | |
1373 | if (written == 0) { | |
1374 | written = ret_splice; | |
1375 | } | |
1376 | ret = errno; | |
1377 | goto splice_error; | |
1378 | } | |
1379 | ||
1380 | /* Handle stream on the relayd if the output is on the network */ | |
1381 | if (relayd) { | |
1382 | if (stream->metadata_flag) { | |
1d4dfdef DG |
1383 | size_t metadata_payload_size = |
1384 | sizeof(struct lttcomm_relayd_metadata_payload); | |
1385 | ||
f02e1e8a | 1386 | /* Update counter to fit the spliced data */ |
1d4dfdef DG |
1387 | ret_splice += metadata_payload_size; |
1388 | len += metadata_payload_size; | |
f02e1e8a DG |
1389 | /* |
1390 | * We do this so the return value can match the len passed as | |
1391 | * argument to this function. | |
1392 | */ | |
1d4dfdef | 1393 | written -= metadata_payload_size; |
f02e1e8a DG |
1394 | } |
1395 | } | |
1396 | ||
1397 | /* Splice data out */ | |
fb3a43a9 | 1398 | ret_splice = splice(splice_pipe[0], NULL, outfd, NULL, |
f02e1e8a | 1399 | ret_splice, SPLICE_F_MOVE | SPLICE_F_MORE); |
1d4dfdef | 1400 | DBG("Consumer splice pipe to file, ret %zd", ret_splice); |
f02e1e8a DG |
1401 | if (ret_splice < 0) { |
1402 | PERROR("Error in file splice"); | |
1403 | if (written == 0) { | |
1404 | written = ret_splice; | |
1405 | } | |
1406 | ret = errno; | |
1407 | goto splice_error; | |
1408 | } else if (ret_splice > len) { | |
1409 | errno = EINVAL; | |
1410 | PERROR("Wrote more data than requested %zd (len: %lu)", | |
1411 | ret_splice, len); | |
1412 | written += ret_splice; | |
1413 | ret = errno; | |
1414 | goto splice_error; | |
1415 | } | |
1416 | len -= ret_splice; | |
1417 | ||
1418 | /* This call is useless on a socket so better save a syscall. */ | |
1419 | if (!relayd) { | |
1420 | /* This won't block, but will start writeout asynchronously */ | |
1421 | lttng_sync_file_range(outfd, stream->out_fd_offset, ret_splice, | |
1422 | SYNC_FILE_RANGE_WRITE); | |
1423 | stream->out_fd_offset += ret_splice; | |
1424 | } | |
1425 | written += ret_splice; | |
1426 | } | |
1427 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
1428 | ||
1429 | ret = ret_splice; | |
1430 | ||
1431 | goto end; | |
1432 | ||
1433 | splice_error: | |
1434 | /* send the appropriate error description to sessiond */ | |
1435 | switch (ret) { | |
1436 | case EBADF: | |
f73fabfd | 1437 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_EBADF); |
f02e1e8a DG |
1438 | break; |
1439 | case EINVAL: | |
f73fabfd | 1440 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_EINVAL); |
f02e1e8a DG |
1441 | break; |
1442 | case ENOMEM: | |
f73fabfd | 1443 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ENOMEM); |
f02e1e8a DG |
1444 | break; |
1445 | case ESPIPE: | |
f73fabfd | 1446 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ESPIPE); |
f02e1e8a DG |
1447 | break; |
1448 | } | |
1449 | ||
1450 | end: | |
1451 | if (relayd && stream->metadata_flag) { | |
1452 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1453 | } | |
1454 | ||
1455 | rcu_read_unlock(); | |
1456 | return written; | |
3bd1e081 MD |
1457 | } |
1458 | ||
1459 | /* | |
1460 | * Take a snapshot for a specific fd | |
1461 | * | |
1462 | * Returns 0 on success, < 0 on error | |
1463 | */ | |
1464 | int lttng_consumer_take_snapshot(struct lttng_consumer_local_data *ctx, | |
1465 | struct lttng_consumer_stream *stream) | |
1466 | { | |
1467 | switch (consumer_data.type) { | |
1468 | case LTTNG_CONSUMER_KERNEL: | |
1469 | return lttng_kconsumer_take_snapshot(ctx, stream); | |
7753dea8 MD |
1470 | case LTTNG_CONSUMER32_UST: |
1471 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1472 | return lttng_ustconsumer_take_snapshot(ctx, stream); |
1473 | default: | |
1474 | ERR("Unknown consumer_data type"); | |
1475 | assert(0); | |
1476 | return -ENOSYS; | |
1477 | } | |
1478 | ||
1479 | } | |
1480 | ||
1481 | /* | |
1482 | * Get the produced position | |
1483 | * | |
1484 | * Returns 0 on success, < 0 on error | |
1485 | */ | |
1486 | int lttng_consumer_get_produced_snapshot( | |
1487 | struct lttng_consumer_local_data *ctx, | |
1488 | struct lttng_consumer_stream *stream, | |
1489 | unsigned long *pos) | |
1490 | { | |
1491 | switch (consumer_data.type) { | |
1492 | case LTTNG_CONSUMER_KERNEL: | |
1493 | return lttng_kconsumer_get_produced_snapshot(ctx, stream, pos); | |
7753dea8 MD |
1494 | case LTTNG_CONSUMER32_UST: |
1495 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1496 | return lttng_ustconsumer_get_produced_snapshot(ctx, stream, pos); |
1497 | default: | |
1498 | ERR("Unknown consumer_data type"); | |
1499 | assert(0); | |
1500 | return -ENOSYS; | |
1501 | } | |
1502 | } | |
1503 | ||
1504 | int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, | |
1505 | int sock, struct pollfd *consumer_sockpoll) | |
1506 | { | |
1507 | switch (consumer_data.type) { | |
1508 | case LTTNG_CONSUMER_KERNEL: | |
1509 | return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
7753dea8 MD |
1510 | case LTTNG_CONSUMER32_UST: |
1511 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1512 | return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll); |
1513 | default: | |
1514 | ERR("Unknown consumer_data type"); | |
1515 | assert(0); | |
1516 | return -ENOSYS; | |
1517 | } | |
1518 | } | |
1519 | ||
fb3a43a9 | 1520 | /* |
f724d81e | 1521 | * Iterate over all streams of the hashtable and free them properly. |
fb3a43a9 DG |
1522 | */ |
1523 | static void destroy_stream_ht(struct lttng_ht *ht) | |
1524 | { | |
1525 | int ret; | |
1526 | struct lttng_ht_iter iter; | |
1527 | struct lttng_consumer_stream *stream; | |
1528 | ||
1529 | if (ht == NULL) { | |
1530 | return; | |
1531 | } | |
1532 | ||
d09e1200 | 1533 | rcu_read_lock(); |
fb3a43a9 DG |
1534 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { |
1535 | ret = lttng_ht_del(ht, &iter); | |
1536 | assert(!ret); | |
1537 | ||
f724d81e | 1538 | call_rcu(&stream->node.head, consumer_free_stream); |
fb3a43a9 | 1539 | } |
d09e1200 | 1540 | rcu_read_unlock(); |
fb3a43a9 DG |
1541 | |
1542 | lttng_ht_destroy(ht); | |
1543 | } | |
1544 | ||
1545 | /* | |
1546 | * Clean up a metadata stream and free its memory. | |
1547 | */ | |
1548 | static void consumer_del_metadata_stream(struct lttng_consumer_stream *stream) | |
1549 | { | |
1550 | int ret; | |
fb3a43a9 DG |
1551 | struct consumer_relayd_sock_pair *relayd; |
1552 | ||
1553 | assert(stream); | |
1554 | /* | |
1555 | * This call should NEVER receive regular stream. It must always be | |
1556 | * metadata stream and this is crucial for data structure synchronization. | |
1557 | */ | |
1558 | assert(stream->metadata_flag); | |
1559 | ||
1560 | pthread_mutex_lock(&consumer_data.lock); | |
1561 | switch (consumer_data.type) { | |
1562 | case LTTNG_CONSUMER_KERNEL: | |
1563 | if (stream->mmap_base != NULL) { | |
1564 | ret = munmap(stream->mmap_base, stream->mmap_len); | |
1565 | if (ret != 0) { | |
1566 | PERROR("munmap metadata stream"); | |
1567 | } | |
1568 | } | |
1569 | break; | |
1570 | case LTTNG_CONSUMER32_UST: | |
1571 | case LTTNG_CONSUMER64_UST: | |
1572 | lttng_ustconsumer_del_stream(stream); | |
1573 | break; | |
1574 | default: | |
1575 | ERR("Unknown consumer_data type"); | |
1576 | assert(0); | |
1577 | } | |
1578 | pthread_mutex_unlock(&consumer_data.lock); | |
1579 | ||
1580 | if (stream->out_fd >= 0) { | |
1581 | ret = close(stream->out_fd); | |
1582 | if (ret) { | |
1583 | PERROR("close"); | |
1584 | } | |
1585 | } | |
1586 | ||
1587 | if (stream->wait_fd >= 0 && !stream->wait_fd_is_copy) { | |
1588 | ret = close(stream->wait_fd); | |
1589 | if (ret) { | |
1590 | PERROR("close"); | |
1591 | } | |
1592 | } | |
1593 | ||
1594 | if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) { | |
1595 | ret = close(stream->shm_fd); | |
1596 | if (ret) { | |
1597 | PERROR("close"); | |
1598 | } | |
1599 | } | |
1600 | ||
1601 | /* Check and cleanup relayd */ | |
1602 | rcu_read_lock(); | |
1603 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1604 | if (relayd != NULL) { | |
1605 | uatomic_dec(&relayd->refcount); | |
1606 | assert(uatomic_read(&relayd->refcount) >= 0); | |
1607 | ||
1608 | /* Closing streams requires to lock the control socket. */ | |
1609 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1610 | ret = relayd_send_close_stream(&relayd->control_sock, | |
1611 | stream->relayd_stream_id, stream->next_net_seq_num - 1); | |
1612 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1613 | if (ret < 0) { | |
1614 | DBG("Unable to close stream on the relayd. Continuing"); | |
1615 | /* | |
1616 | * Continue here. There is nothing we can do for the relayd. | |
1617 | * Chances are that the relayd has closed the socket so we just | |
1618 | * continue cleaning up. | |
1619 | */ | |
1620 | } | |
1621 | ||
1622 | /* Both conditions are met, we destroy the relayd. */ | |
1623 | if (uatomic_read(&relayd->refcount) == 0 && | |
1624 | uatomic_read(&relayd->destroy_flag)) { | |
d09e1200 | 1625 | destroy_relayd(relayd); |
fb3a43a9 DG |
1626 | } |
1627 | } | |
1628 | rcu_read_unlock(); | |
1629 | ||
1630 | /* Atomically decrement channel refcount since other threads can use it. */ | |
1631 | uatomic_dec(&stream->chan->refcount); | |
c30aaa51 MD |
1632 | if (!uatomic_read(&stream->chan->refcount) |
1633 | && !uatomic_read(&stream->chan->nb_init_streams)) { | |
1634 | /* Go for channel deletion! */ | |
1635 | consumer_del_channel(stream->chan); | |
fb3a43a9 DG |
1636 | } |
1637 | ||
f724d81e | 1638 | call_rcu(&stream->node.head, consumer_free_stream); |
fb3a43a9 DG |
1639 | } |
1640 | ||
1641 | /* | |
1642 | * Action done with the metadata stream when adding it to the consumer internal | |
1643 | * data structures to handle it. | |
1644 | */ | |
1645 | static void consumer_add_metadata_stream(struct lttng_consumer_stream *stream) | |
1646 | { | |
1647 | struct consumer_relayd_sock_pair *relayd; | |
1648 | ||
1649 | /* Find relayd and, if one is found, increment refcount. */ | |
1650 | rcu_read_lock(); | |
1651 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1652 | if (relayd != NULL) { | |
1653 | uatomic_inc(&relayd->refcount); | |
1654 | } | |
1655 | rcu_read_unlock(); | |
1656 | } | |
1657 | ||
1658 | /* | |
1659 | * Thread polls on metadata file descriptor and write them on disk or on the | |
1660 | * network. | |
1661 | */ | |
1662 | void *lttng_consumer_thread_poll_metadata(void *data) | |
1663 | { | |
1664 | int ret, i, pollfd; | |
1665 | uint32_t revents, nb_fd; | |
1666 | struct lttng_consumer_stream *stream; | |
1667 | struct lttng_ht_iter iter; | |
1668 | struct lttng_ht_node_ulong *node; | |
1669 | struct lttng_ht *metadata_ht = NULL; | |
1670 | struct lttng_poll_event events; | |
1671 | struct lttng_consumer_local_data *ctx = data; | |
1672 | ssize_t len; | |
1673 | ||
1674 | rcu_register_thread(); | |
1675 | ||
1676 | DBG("Thread metadata poll started"); | |
1677 | ||
1678 | metadata_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
1679 | if (metadata_ht == NULL) { | |
1680 | goto end; | |
1681 | } | |
1682 | ||
1683 | /* Size is set to 1 for the consumer_metadata pipe */ | |
1684 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
1685 | if (ret < 0) { | |
1686 | ERR("Poll set creation failed"); | |
1687 | goto end; | |
1688 | } | |
1689 | ||
1690 | ret = lttng_poll_add(&events, ctx->consumer_metadata_pipe[0], LPOLLIN); | |
1691 | if (ret < 0) { | |
1692 | goto end; | |
1693 | } | |
1694 | ||
1695 | /* Main loop */ | |
1696 | DBG("Metadata main loop started"); | |
1697 | ||
1698 | while (1) { | |
1699 | lttng_poll_reset(&events); | |
1700 | ||
1701 | nb_fd = LTTNG_POLL_GETNB(&events); | |
1702 | ||
1703 | /* Only the metadata pipe is set */ | |
1704 | if (nb_fd == 0 && consumer_quit == 1) { | |
1705 | goto end; | |
1706 | } | |
1707 | ||
1708 | restart: | |
1709 | DBG("Metadata poll wait with %d fd(s)", nb_fd); | |
1710 | ret = lttng_poll_wait(&events, -1); | |
1711 | DBG("Metadata event catched in thread"); | |
1712 | if (ret < 0) { | |
1713 | if (errno == EINTR) { | |
1714 | goto restart; | |
1715 | } | |
1716 | goto error; | |
1717 | } | |
1718 | ||
1719 | for (i = 0; i < nb_fd; i++) { | |
1720 | revents = LTTNG_POLL_GETEV(&events, i); | |
1721 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1722 | ||
1723 | /* Check the metadata pipe for incoming metadata. */ | |
1724 | if (pollfd == ctx->consumer_metadata_pipe[0]) { | |
4adabd61 | 1725 | if (revents & (LPOLLERR | LPOLLHUP )) { |
fb3a43a9 DG |
1726 | DBG("Metadata thread pipe hung up"); |
1727 | /* | |
1728 | * Remove the pipe from the poll set and continue the loop | |
1729 | * since their might be data to consume. | |
1730 | */ | |
1731 | lttng_poll_del(&events, ctx->consumer_metadata_pipe[0]); | |
1732 | close(ctx->consumer_metadata_pipe[0]); | |
1733 | continue; | |
1734 | } else if (revents & LPOLLIN) { | |
fb3a43a9 | 1735 | do { |
633d0084 DG |
1736 | /* Get the stream pointer received */ |
1737 | ret = read(pollfd, &stream, sizeof(stream)); | |
fb3a43a9 | 1738 | } while (ret < 0 && errno == EINTR); |
633d0084 DG |
1739 | if (ret < 0 || |
1740 | ret < sizeof(struct lttng_consumer_stream *)) { | |
fb3a43a9 | 1741 | PERROR("read metadata stream"); |
fb3a43a9 DG |
1742 | /* |
1743 | * Let's continue here and hope we can still work | |
1744 | * without stopping the consumer. XXX: Should we? | |
1745 | */ | |
1746 | continue; | |
1747 | } | |
1748 | ||
1749 | DBG("Adding metadata stream %d to poll set", | |
1750 | stream->wait_fd); | |
1751 | ||
d09e1200 | 1752 | rcu_read_lock(); |
fb3a43a9 DG |
1753 | /* The node should be init at this point */ |
1754 | lttng_ht_add_unique_ulong(metadata_ht, | |
1755 | &stream->waitfd_node); | |
d09e1200 | 1756 | rcu_read_unlock(); |
fb3a43a9 DG |
1757 | |
1758 | /* Add metadata stream to the global poll events list */ | |
1759 | lttng_poll_add(&events, stream->wait_fd, | |
1760 | LPOLLIN | LPOLLPRI); | |
1761 | ||
1762 | consumer_add_metadata_stream(stream); | |
1763 | } | |
1764 | ||
1765 | /* Metadata pipe handled. Continue handling the others */ | |
1766 | continue; | |
1767 | } | |
1768 | ||
1769 | /* From here, the event is a metadata wait fd */ | |
1770 | ||
d09e1200 | 1771 | rcu_read_lock(); |
fb3a43a9 DG |
1772 | lttng_ht_lookup(metadata_ht, (void *)((unsigned long) pollfd), |
1773 | &iter); | |
1774 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1775 | if (node == NULL) { | |
1776 | /* FD not found, continue loop */ | |
d09e1200 | 1777 | rcu_read_unlock(); |
fb3a43a9 DG |
1778 | continue; |
1779 | } | |
1780 | ||
1781 | stream = caa_container_of(node, struct lttng_consumer_stream, | |
1782 | waitfd_node); | |
1783 | ||
1784 | /* Get the data out of the metadata file descriptor */ | |
1785 | if (revents & (LPOLLIN | LPOLLPRI)) { | |
1786 | DBG("Metadata available on fd %d", pollfd); | |
1787 | assert(stream->wait_fd == pollfd); | |
1788 | ||
1789 | len = ctx->on_buffer_ready(stream, ctx); | |
1790 | /* It's ok to have an unavailable sub-buffer */ | |
1791 | if (len < 0 && len != -EAGAIN) { | |
d09e1200 | 1792 | rcu_read_unlock(); |
fb3a43a9 DG |
1793 | goto end; |
1794 | } else if (len > 0) { | |
1795 | stream->data_read = 1; | |
1796 | } | |
1797 | } | |
1798 | ||
1799 | /* | |
1800 | * Remove the stream from the hash table since there is no data | |
1801 | * left on the fd because we previously did a read on the buffer. | |
1802 | */ | |
4adabd61 | 1803 | if (revents & (LPOLLERR | LPOLLHUP)) { |
fb3a43a9 DG |
1804 | DBG("Metadata fd %d is hup|err|nval.", pollfd); |
1805 | if (!stream->hangup_flush_done | |
1806 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
1807 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
1808 | DBG("Attempting to flush and consume the UST buffers"); | |
1809 | lttng_ustconsumer_on_stream_hangup(stream); | |
1810 | ||
1811 | /* We just flushed the stream now read it. */ | |
1812 | len = ctx->on_buffer_ready(stream, ctx); | |
1813 | /* It's ok to have an unavailable sub-buffer */ | |
1814 | if (len < 0 && len != -EAGAIN) { | |
d09e1200 | 1815 | rcu_read_unlock(); |
fb3a43a9 DG |
1816 | goto end; |
1817 | } | |
1818 | } | |
1819 | ||
1820 | /* Removing it from hash table, poll set and free memory */ | |
1821 | lttng_ht_del(metadata_ht, &iter); | |
d09e1200 | 1822 | |
fb3a43a9 DG |
1823 | lttng_poll_del(&events, stream->wait_fd); |
1824 | consumer_del_metadata_stream(stream); | |
1825 | } | |
d09e1200 | 1826 | rcu_read_unlock(); |
fb3a43a9 DG |
1827 | } |
1828 | } | |
1829 | ||
1830 | error: | |
1831 | end: | |
1832 | DBG("Metadata poll thread exiting"); | |
1833 | lttng_poll_clean(&events); | |
1834 | ||
1835 | if (metadata_ht) { | |
1836 | destroy_stream_ht(metadata_ht); | |
1837 | } | |
1838 | ||
1839 | rcu_unregister_thread(); | |
1840 | return NULL; | |
1841 | } | |
1842 | ||
3bd1e081 | 1843 | /* |
e4421fec | 1844 | * This thread polls the fds in the set to consume the data and write |
3bd1e081 MD |
1845 | * it to tracefile if necessary. |
1846 | */ | |
1847 | void *lttng_consumer_thread_poll_fds(void *data) | |
1848 | { | |
1849 | int num_rdy, num_hup, high_prio, ret, i; | |
1850 | struct pollfd *pollfd = NULL; | |
1851 | /* local view of the streams */ | |
1852 | struct lttng_consumer_stream **local_stream = NULL; | |
1853 | /* local view of consumer_data.fds_count */ | |
1854 | int nb_fd = 0; | |
3bd1e081 | 1855 | struct lttng_consumer_local_data *ctx = data; |
00e2e675 | 1856 | ssize_t len; |
fb3a43a9 DG |
1857 | pthread_t metadata_thread; |
1858 | void *status; | |
3bd1e081 | 1859 | |
e7b994a3 DG |
1860 | rcu_register_thread(); |
1861 | ||
fb3a43a9 DG |
1862 | /* Start metadata polling thread */ |
1863 | ret = pthread_create(&metadata_thread, NULL, | |
1864 | lttng_consumer_thread_poll_metadata, (void *) ctx); | |
1865 | if (ret < 0) { | |
1866 | PERROR("pthread_create metadata thread"); | |
1867 | goto end; | |
1868 | } | |
1869 | ||
effcf122 | 1870 | local_stream = zmalloc(sizeof(struct lttng_consumer_stream)); |
3bd1e081 MD |
1871 | |
1872 | while (1) { | |
1873 | high_prio = 0; | |
1874 | num_hup = 0; | |
1875 | ||
1876 | /* | |
e4421fec | 1877 | * the fds set has been updated, we need to update our |
3bd1e081 MD |
1878 | * local array as well |
1879 | */ | |
1880 | pthread_mutex_lock(&consumer_data.lock); | |
1881 | if (consumer_data.need_update) { | |
1882 | if (pollfd != NULL) { | |
1883 | free(pollfd); | |
1884 | pollfd = NULL; | |
1885 | } | |
1886 | if (local_stream != NULL) { | |
1887 | free(local_stream); | |
1888 | local_stream = NULL; | |
1889 | } | |
1890 | ||
1891 | /* allocate for all fds + 1 for the consumer_poll_pipe */ | |
effcf122 | 1892 | pollfd = zmalloc((consumer_data.stream_count + 1) * sizeof(struct pollfd)); |
3bd1e081 | 1893 | if (pollfd == NULL) { |
7a57cf92 | 1894 | PERROR("pollfd malloc"); |
3bd1e081 MD |
1895 | pthread_mutex_unlock(&consumer_data.lock); |
1896 | goto end; | |
1897 | } | |
1898 | ||
1899 | /* allocate for all fds + 1 for the consumer_poll_pipe */ | |
effcf122 | 1900 | local_stream = zmalloc((consumer_data.stream_count + 1) * |
3bd1e081 MD |
1901 | sizeof(struct lttng_consumer_stream)); |
1902 | if (local_stream == NULL) { | |
7a57cf92 | 1903 | PERROR("local_stream malloc"); |
3bd1e081 MD |
1904 | pthread_mutex_unlock(&consumer_data.lock); |
1905 | goto end; | |
1906 | } | |
fb3a43a9 | 1907 | ret = consumer_update_poll_array(ctx, &pollfd, local_stream); |
3bd1e081 MD |
1908 | if (ret < 0) { |
1909 | ERR("Error in allocating pollfd or local_outfds"); | |
f73fabfd | 1910 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
1911 | pthread_mutex_unlock(&consumer_data.lock); |
1912 | goto end; | |
1913 | } | |
1914 | nb_fd = ret; | |
1915 | consumer_data.need_update = 0; | |
1916 | } | |
1917 | pthread_mutex_unlock(&consumer_data.lock); | |
1918 | ||
4078b776 MD |
1919 | /* No FDs and consumer_quit, consumer_cleanup the thread */ |
1920 | if (nb_fd == 0 && consumer_quit == 1) { | |
1921 | goto end; | |
1922 | } | |
3bd1e081 | 1923 | /* poll on the array of fds */ |
88f2b785 | 1924 | restart: |
3bd1e081 MD |
1925 | DBG("polling on %d fd", nb_fd + 1); |
1926 | num_rdy = poll(pollfd, nb_fd + 1, consumer_poll_timeout); | |
1927 | DBG("poll num_rdy : %d", num_rdy); | |
1928 | if (num_rdy == -1) { | |
88f2b785 MD |
1929 | /* |
1930 | * Restart interrupted system call. | |
1931 | */ | |
1932 | if (errno == EINTR) { | |
1933 | goto restart; | |
1934 | } | |
7a57cf92 | 1935 | PERROR("Poll error"); |
f73fabfd | 1936 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
1937 | goto end; |
1938 | } else if (num_rdy == 0) { | |
1939 | DBG("Polling thread timed out"); | |
1940 | goto end; | |
1941 | } | |
1942 | ||
3bd1e081 | 1943 | /* |
00e2e675 DG |
1944 | * If the consumer_poll_pipe triggered poll go directly to the |
1945 | * beginning of the loop to update the array. We want to prioritize | |
1946 | * array update over low-priority reads. | |
3bd1e081 | 1947 | */ |
509bb1cf | 1948 | if (pollfd[nb_fd].revents & (POLLIN | POLLPRI)) { |
04fdd819 MD |
1949 | size_t pipe_readlen; |
1950 | char tmp; | |
1951 | ||
3bd1e081 | 1952 | DBG("consumer_poll_pipe wake up"); |
04fdd819 MD |
1953 | /* Consume 1 byte of pipe data */ |
1954 | do { | |
1955 | pipe_readlen = read(ctx->consumer_poll_pipe[0], &tmp, 1); | |
1956 | } while (pipe_readlen == -1 && errno == EINTR); | |
3bd1e081 MD |
1957 | continue; |
1958 | } | |
1959 | ||
1960 | /* Take care of high priority channels first. */ | |
1961 | for (i = 0; i < nb_fd; i++) { | |
fb3a43a9 | 1962 | if (pollfd[i].revents & POLLPRI) { |
d41f73b7 MD |
1963 | DBG("Urgent read on fd %d", pollfd[i].fd); |
1964 | high_prio = 1; | |
4078b776 | 1965 | len = ctx->on_buffer_ready(local_stream[i], ctx); |
d41f73b7 | 1966 | /* it's ok to have an unavailable sub-buffer */ |
4078b776 MD |
1967 | if (len < 0 && len != -EAGAIN) { |
1968 | goto end; | |
1969 | } else if (len > 0) { | |
1970 | local_stream[i]->data_read = 1; | |
d41f73b7 | 1971 | } |
3bd1e081 MD |
1972 | } |
1973 | } | |
1974 | ||
4078b776 MD |
1975 | /* |
1976 | * If we read high prio channel in this loop, try again | |
1977 | * for more high prio data. | |
1978 | */ | |
1979 | if (high_prio) { | |
3bd1e081 MD |
1980 | continue; |
1981 | } | |
1982 | ||
1983 | /* Take care of low priority channels. */ | |
4078b776 MD |
1984 | for (i = 0; i < nb_fd; i++) { |
1985 | if ((pollfd[i].revents & POLLIN) || | |
1986 | local_stream[i]->hangup_flush_done) { | |
4078b776 MD |
1987 | DBG("Normal read on fd %d", pollfd[i].fd); |
1988 | len = ctx->on_buffer_ready(local_stream[i], ctx); | |
1989 | /* it's ok to have an unavailable sub-buffer */ | |
1990 | if (len < 0 && len != -EAGAIN) { | |
1991 | goto end; | |
1992 | } else if (len > 0) { | |
1993 | local_stream[i]->data_read = 1; | |
1994 | } | |
1995 | } | |
1996 | } | |
1997 | ||
1998 | /* Handle hangup and errors */ | |
1999 | for (i = 0; i < nb_fd; i++) { | |
2000 | if (!local_stream[i]->hangup_flush_done | |
2001 | && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL)) | |
2002 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
2003 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
2004 | DBG("fd %d is hup|err|nval. Attempting flush and read.", | |
2005 | pollfd[i].fd); | |
2006 | lttng_ustconsumer_on_stream_hangup(local_stream[i]); | |
2007 | /* Attempt read again, for the data we just flushed. */ | |
2008 | local_stream[i]->data_read = 1; | |
2009 | } | |
2010 | /* | |
2011 | * If the poll flag is HUP/ERR/NVAL and we have | |
2012 | * read no data in this pass, we can remove the | |
2013 | * stream from its hash table. | |
2014 | */ | |
2015 | if ((pollfd[i].revents & POLLHUP)) { | |
2016 | DBG("Polling fd %d tells it has hung up.", pollfd[i].fd); | |
2017 | if (!local_stream[i]->data_read) { | |
702b1ea4 | 2018 | consumer_del_stream(local_stream[i]); |
4078b776 MD |
2019 | num_hup++; |
2020 | } | |
2021 | } else if (pollfd[i].revents & POLLERR) { | |
2022 | ERR("Error returned in polling fd %d.", pollfd[i].fd); | |
2023 | if (!local_stream[i]->data_read) { | |
702b1ea4 | 2024 | consumer_del_stream(local_stream[i]); |
4078b776 MD |
2025 | num_hup++; |
2026 | } | |
2027 | } else if (pollfd[i].revents & POLLNVAL) { | |
2028 | ERR("Polling fd %d tells fd is not open.", pollfd[i].fd); | |
2029 | if (!local_stream[i]->data_read) { | |
702b1ea4 | 2030 | consumer_del_stream(local_stream[i]); |
4078b776 | 2031 | num_hup++; |
3bd1e081 MD |
2032 | } |
2033 | } | |
4078b776 | 2034 | local_stream[i]->data_read = 0; |
3bd1e081 MD |
2035 | } |
2036 | } | |
2037 | end: | |
2038 | DBG("polling thread exiting"); | |
2039 | if (pollfd != NULL) { | |
2040 | free(pollfd); | |
2041 | pollfd = NULL; | |
2042 | } | |
2043 | if (local_stream != NULL) { | |
2044 | free(local_stream); | |
2045 | local_stream = NULL; | |
2046 | } | |
fb3a43a9 DG |
2047 | |
2048 | /* | |
2049 | * Close the write side of the pipe so epoll_wait() in | |
2050 | * lttng_consumer_thread_poll_metadata can catch it. The thread is | |
2051 | * monitoring the read side of the pipe. If we close them both, epoll_wait | |
2052 | * strangely does not return and could create a endless wait period if the | |
2053 | * pipe is the only tracked fd in the poll set. The thread will take care | |
2054 | * of closing the read side. | |
2055 | */ | |
2056 | close(ctx->consumer_metadata_pipe[1]); | |
2057 | if (ret) { | |
2058 | ret = pthread_join(metadata_thread, &status); | |
2059 | if (ret < 0) { | |
2060 | PERROR("pthread_join metadata thread"); | |
2061 | } | |
2062 | } | |
2063 | ||
e7b994a3 | 2064 | rcu_unregister_thread(); |
3bd1e081 MD |
2065 | return NULL; |
2066 | } | |
2067 | ||
2068 | /* | |
2069 | * This thread listens on the consumerd socket and receives the file | |
2070 | * descriptors from the session daemon. | |
2071 | */ | |
2072 | void *lttng_consumer_thread_receive_fds(void *data) | |
2073 | { | |
2074 | int sock, client_socket, ret; | |
2075 | /* | |
2076 | * structure to poll for incoming data on communication socket avoids | |
2077 | * making blocking sockets. | |
2078 | */ | |
2079 | struct pollfd consumer_sockpoll[2]; | |
2080 | struct lttng_consumer_local_data *ctx = data; | |
2081 | ||
e7b994a3 DG |
2082 | rcu_register_thread(); |
2083 | ||
3bd1e081 MD |
2084 | DBG("Creating command socket %s", ctx->consumer_command_sock_path); |
2085 | unlink(ctx->consumer_command_sock_path); | |
2086 | client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path); | |
2087 | if (client_socket < 0) { | |
2088 | ERR("Cannot create command socket"); | |
2089 | goto end; | |
2090 | } | |
2091 | ||
2092 | ret = lttcomm_listen_unix_sock(client_socket); | |
2093 | if (ret < 0) { | |
2094 | goto end; | |
2095 | } | |
2096 | ||
32258573 | 2097 | DBG("Sending ready command to lttng-sessiond"); |
f73fabfd | 2098 | ret = lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_COMMAND_SOCK_READY); |
3bd1e081 MD |
2099 | /* return < 0 on error, but == 0 is not fatal */ |
2100 | if (ret < 0) { | |
32258573 | 2101 | ERR("Error sending ready command to lttng-sessiond"); |
3bd1e081 MD |
2102 | goto end; |
2103 | } | |
2104 | ||
2105 | ret = fcntl(client_socket, F_SETFL, O_NONBLOCK); | |
2106 | if (ret < 0) { | |
7a57cf92 | 2107 | PERROR("fcntl O_NONBLOCK"); |
3bd1e081 MD |
2108 | goto end; |
2109 | } | |
2110 | ||
2111 | /* prepare the FDs to poll : to client socket and the should_quit pipe */ | |
2112 | consumer_sockpoll[0].fd = ctx->consumer_should_quit[0]; | |
2113 | consumer_sockpoll[0].events = POLLIN | POLLPRI; | |
2114 | consumer_sockpoll[1].fd = client_socket; | |
2115 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
2116 | ||
2117 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2118 | goto end; | |
2119 | } | |
2120 | DBG("Connection on client_socket"); | |
2121 | ||
2122 | /* Blocking call, waiting for transmission */ | |
2123 | sock = lttcomm_accept_unix_sock(client_socket); | |
2124 | if (sock <= 0) { | |
2125 | WARN("On accept"); | |
2126 | goto end; | |
2127 | } | |
2128 | ret = fcntl(sock, F_SETFL, O_NONBLOCK); | |
2129 | if (ret < 0) { | |
7a57cf92 | 2130 | PERROR("fcntl O_NONBLOCK"); |
3bd1e081 MD |
2131 | goto end; |
2132 | } | |
2133 | ||
2134 | /* update the polling structure to poll on the established socket */ | |
2135 | consumer_sockpoll[1].fd = sock; | |
2136 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
2137 | ||
2138 | while (1) { | |
2139 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2140 | goto end; | |
2141 | } | |
2142 | DBG("Incoming command on sock"); | |
2143 | ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
2144 | if (ret == -ENOENT) { | |
2145 | DBG("Received STOP command"); | |
2146 | goto end; | |
2147 | } | |
4cbc1a04 DG |
2148 | if (ret <= 0) { |
2149 | /* | |
2150 | * This could simply be a session daemon quitting. Don't output | |
2151 | * ERR() here. | |
2152 | */ | |
2153 | DBG("Communication interrupted on command socket"); | |
3bd1e081 MD |
2154 | goto end; |
2155 | } | |
2156 | if (consumer_quit) { | |
2157 | DBG("consumer_thread_receive_fds received quit from signal"); | |
2158 | goto end; | |
2159 | } | |
2160 | DBG("received fds on sock"); | |
2161 | } | |
2162 | end: | |
2163 | DBG("consumer_thread_receive_fds exiting"); | |
2164 | ||
2165 | /* | |
2166 | * when all fds have hung up, the polling thread | |
2167 | * can exit cleanly | |
2168 | */ | |
2169 | consumer_quit = 1; | |
2170 | ||
2171 | /* | |
2172 | * 2s of grace period, if no polling events occur during | |
2173 | * this period, the polling thread will exit even if there | |
2174 | * are still open FDs (should not happen, but safety mechanism). | |
2175 | */ | |
2176 | consumer_poll_timeout = LTTNG_CONSUMER_POLL_TIMEOUT; | |
2177 | ||
04fdd819 MD |
2178 | /* |
2179 | * Wake-up the other end by writing a null byte in the pipe | |
2180 | * (non-blocking). Important note: Because writing into the | |
2181 | * pipe is non-blocking (and therefore we allow dropping wakeup | |
2182 | * data, as long as there is wakeup data present in the pipe | |
2183 | * buffer to wake up the other end), the other end should | |
2184 | * perform the following sequence for waiting: | |
2185 | * 1) empty the pipe (reads). | |
2186 | * 2) perform update operation. | |
2187 | * 3) wait on the pipe (poll). | |
2188 | */ | |
2189 | do { | |
2190 | ret = write(ctx->consumer_poll_pipe[1], "", 1); | |
6f94560a | 2191 | } while (ret < 0 && errno == EINTR); |
e7b994a3 | 2192 | rcu_unregister_thread(); |
3bd1e081 MD |
2193 | return NULL; |
2194 | } | |
d41f73b7 | 2195 | |
4078b776 | 2196 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
2197 | struct lttng_consumer_local_data *ctx) |
2198 | { | |
2199 | switch (consumer_data.type) { | |
2200 | case LTTNG_CONSUMER_KERNEL: | |
2201 | return lttng_kconsumer_read_subbuffer(stream, ctx); | |
7753dea8 MD |
2202 | case LTTNG_CONSUMER32_UST: |
2203 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
2204 | return lttng_ustconsumer_read_subbuffer(stream, ctx); |
2205 | default: | |
2206 | ERR("Unknown consumer_data type"); | |
2207 | assert(0); | |
2208 | return -ENOSYS; | |
2209 | } | |
2210 | } | |
2211 | ||
2212 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
2213 | { | |
2214 | switch (consumer_data.type) { | |
2215 | case LTTNG_CONSUMER_KERNEL: | |
2216 | return lttng_kconsumer_on_recv_stream(stream); | |
7753dea8 MD |
2217 | case LTTNG_CONSUMER32_UST: |
2218 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
2219 | return lttng_ustconsumer_on_recv_stream(stream); |
2220 | default: | |
2221 | ERR("Unknown consumer_data type"); | |
2222 | assert(0); | |
2223 | return -ENOSYS; | |
2224 | } | |
2225 | } | |
e4421fec DG |
2226 | |
2227 | /* | |
2228 | * Allocate and set consumer data hash tables. | |
2229 | */ | |
2230 | void lttng_consumer_init(void) | |
2231 | { | |
2232 | consumer_data.stream_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
2233 | consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
00e2e675 | 2234 | consumer_data.relayd_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
e4421fec | 2235 | } |
7735ef9e DG |
2236 | |
2237 | /* | |
2238 | * Process the ADD_RELAYD command receive by a consumer. | |
2239 | * | |
2240 | * This will create a relayd socket pair and add it to the relayd hash table. | |
2241 | * The caller MUST acquire a RCU read side lock before calling it. | |
2242 | */ | |
2243 | int consumer_add_relayd_socket(int net_seq_idx, int sock_type, | |
2244 | struct lttng_consumer_local_data *ctx, int sock, | |
2245 | struct pollfd *consumer_sockpoll, struct lttcomm_sock *relayd_sock) | |
2246 | { | |
2247 | int fd, ret = -1; | |
2248 | struct consumer_relayd_sock_pair *relayd; | |
2249 | ||
2250 | DBG("Consumer adding relayd socket (idx: %d)", net_seq_idx); | |
2251 | ||
2252 | /* Get relayd reference if exists. */ | |
2253 | relayd = consumer_find_relayd(net_seq_idx); | |
2254 | if (relayd == NULL) { | |
2255 | /* Not found. Allocate one. */ | |
2256 | relayd = consumer_allocate_relayd_sock_pair(net_seq_idx); | |
2257 | if (relayd == NULL) { | |
f73fabfd | 2258 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
7735ef9e DG |
2259 | goto error; |
2260 | } | |
2261 | } | |
2262 | ||
2263 | /* Poll on consumer socket. */ | |
2264 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2265 | ret = -EINTR; | |
2266 | goto error; | |
2267 | } | |
2268 | ||
2269 | /* Get relayd socket from session daemon */ | |
2270 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); | |
2271 | if (ret != sizeof(fd)) { | |
f73fabfd | 2272 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
7735ef9e DG |
2273 | ret = -1; |
2274 | goto error; | |
2275 | } | |
2276 | ||
2277 | /* Copy socket information and received FD */ | |
2278 | switch (sock_type) { | |
2279 | case LTTNG_STREAM_CONTROL: | |
2280 | /* Copy received lttcomm socket */ | |
2281 | lttcomm_copy_sock(&relayd->control_sock, relayd_sock); | |
2282 | ret = lttcomm_create_sock(&relayd->control_sock); | |
2283 | if (ret < 0) { | |
2284 | goto error; | |
2285 | } | |
2286 | ||
2287 | /* Close the created socket fd which is useless */ | |
2288 | close(relayd->control_sock.fd); | |
2289 | ||
2290 | /* Assign new file descriptor */ | |
2291 | relayd->control_sock.fd = fd; | |
2292 | break; | |
2293 | case LTTNG_STREAM_DATA: | |
2294 | /* Copy received lttcomm socket */ | |
2295 | lttcomm_copy_sock(&relayd->data_sock, relayd_sock); | |
2296 | ret = lttcomm_create_sock(&relayd->data_sock); | |
2297 | if (ret < 0) { | |
2298 | goto error; | |
2299 | } | |
2300 | ||
2301 | /* Close the created socket fd which is useless */ | |
2302 | close(relayd->data_sock.fd); | |
2303 | ||
2304 | /* Assign new file descriptor */ | |
2305 | relayd->data_sock.fd = fd; | |
2306 | break; | |
2307 | default: | |
2308 | ERR("Unknown relayd socket type (%d)", sock_type); | |
2309 | goto error; | |
2310 | } | |
2311 | ||
2312 | DBG("Consumer %s socket created successfully with net idx %d (fd: %d)", | |
2313 | sock_type == LTTNG_STREAM_CONTROL ? "control" : "data", | |
2314 | relayd->net_seq_idx, fd); | |
2315 | ||
2316 | /* | |
2317 | * Add relayd socket pair to consumer data hashtable. If object already | |
2318 | * exists or on error, the function gracefully returns. | |
2319 | */ | |
d09e1200 | 2320 | add_relayd(relayd); |
7735ef9e DG |
2321 | |
2322 | /* All good! */ | |
2323 | ret = 0; | |
2324 | ||
2325 | error: | |
2326 | return ret; | |
2327 | } |