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> | |
30 | ||
990570ed | 31 | #include <common/common.h> |
10a8a223 | 32 | #include <common/kernel-ctl/kernel-ctl.h> |
00e2e675 | 33 | #include <common/sessiond-comm/relayd.h> |
10a8a223 DG |
34 | #include <common/sessiond-comm/sessiond-comm.h> |
35 | #include <common/kernel-consumer/kernel-consumer.h> | |
00e2e675 | 36 | #include <common/relayd/relayd.h> |
10a8a223 DG |
37 | #include <common/ust-consumer/ust-consumer.h> |
38 | ||
39 | #include "consumer.h" | |
3bd1e081 MD |
40 | |
41 | struct lttng_consumer_global_data consumer_data = { | |
3bd1e081 MD |
42 | .stream_count = 0, |
43 | .need_update = 1, | |
44 | .type = LTTNG_CONSUMER_UNKNOWN, | |
45 | }; | |
46 | ||
47 | /* timeout parameter, to control the polling thread grace period. */ | |
48 | int consumer_poll_timeout = -1; | |
49 | ||
50 | /* | |
51 | * Flag to inform the polling thread to quit when all fd hung up. Updated by | |
52 | * the consumer_thread_receive_fds when it notices that all fds has hung up. | |
53 | * Also updated by the signal handler (consumer_should_exit()). Read by the | |
54 | * polling threads. | |
55 | */ | |
56 | volatile int consumer_quit = 0; | |
57 | ||
58 | /* | |
59 | * Find a stream. The consumer_data.lock must be locked during this | |
60 | * call. | |
61 | */ | |
62 | static struct lttng_consumer_stream *consumer_find_stream(int key) | |
63 | { | |
e4421fec DG |
64 | struct lttng_ht_iter iter; |
65 | struct lttng_ht_node_ulong *node; | |
66 | struct lttng_consumer_stream *stream = NULL; | |
3bd1e081 | 67 | |
7ad0a0cb MD |
68 | /* Negative keys are lookup failures */ |
69 | if (key < 0) | |
70 | return NULL; | |
e4421fec | 71 | |
6065ceec DG |
72 | rcu_read_lock(); |
73 | ||
e4421fec DG |
74 | lttng_ht_lookup(consumer_data.stream_ht, (void *)((unsigned long) key), |
75 | &iter); | |
76 | node = lttng_ht_iter_get_node_ulong(&iter); | |
77 | if (node != NULL) { | |
78 | stream = caa_container_of(node, struct lttng_consumer_stream, node); | |
3bd1e081 | 79 | } |
e4421fec | 80 | |
6065ceec DG |
81 | rcu_read_unlock(); |
82 | ||
e4421fec | 83 | return stream; |
3bd1e081 MD |
84 | } |
85 | ||
7ad0a0cb MD |
86 | static void consumer_steal_stream_key(int key) |
87 | { | |
88 | struct lttng_consumer_stream *stream; | |
89 | ||
04253271 | 90 | rcu_read_lock(); |
7ad0a0cb | 91 | stream = consumer_find_stream(key); |
04253271 | 92 | if (stream) { |
7ad0a0cb | 93 | stream->key = -1; |
04253271 MD |
94 | /* |
95 | * We don't want the lookup to match, but we still need | |
96 | * to iterate on this stream when iterating over the hash table. Just | |
97 | * change the node key. | |
98 | */ | |
99 | stream->node.key = -1; | |
100 | } | |
101 | rcu_read_unlock(); | |
7ad0a0cb MD |
102 | } |
103 | ||
3bd1e081 MD |
104 | static struct lttng_consumer_channel *consumer_find_channel(int key) |
105 | { | |
e4421fec DG |
106 | struct lttng_ht_iter iter; |
107 | struct lttng_ht_node_ulong *node; | |
108 | struct lttng_consumer_channel *channel = NULL; | |
3bd1e081 | 109 | |
7ad0a0cb MD |
110 | /* Negative keys are lookup failures */ |
111 | if (key < 0) | |
112 | return NULL; | |
e4421fec | 113 | |
6065ceec DG |
114 | rcu_read_lock(); |
115 | ||
e4421fec DG |
116 | lttng_ht_lookup(consumer_data.channel_ht, (void *)((unsigned long) key), |
117 | &iter); | |
118 | node = lttng_ht_iter_get_node_ulong(&iter); | |
119 | if (node != NULL) { | |
120 | channel = caa_container_of(node, struct lttng_consumer_channel, node); | |
3bd1e081 | 121 | } |
e4421fec | 122 | |
6065ceec DG |
123 | rcu_read_unlock(); |
124 | ||
e4421fec | 125 | return channel; |
3bd1e081 MD |
126 | } |
127 | ||
7ad0a0cb MD |
128 | static void consumer_steal_channel_key(int key) |
129 | { | |
130 | struct lttng_consumer_channel *channel; | |
131 | ||
04253271 | 132 | rcu_read_lock(); |
7ad0a0cb | 133 | channel = consumer_find_channel(key); |
04253271 | 134 | if (channel) { |
7ad0a0cb | 135 | channel->key = -1; |
04253271 MD |
136 | /* |
137 | * We don't want the lookup to match, but we still need | |
138 | * to iterate on this channel when iterating over the hash table. Just | |
139 | * change the node key. | |
140 | */ | |
141 | channel->node.key = -1; | |
142 | } | |
143 | rcu_read_unlock(); | |
7ad0a0cb MD |
144 | } |
145 | ||
702b1ea4 MD |
146 | static |
147 | void consumer_free_stream(struct rcu_head *head) | |
148 | { | |
149 | struct lttng_ht_node_ulong *node = | |
150 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
151 | struct lttng_consumer_stream *stream = | |
152 | caa_container_of(node, struct lttng_consumer_stream, node); | |
153 | ||
154 | free(stream); | |
155 | } | |
156 | ||
00e2e675 DG |
157 | /* |
158 | * RCU protected relayd socket pair free. | |
159 | */ | |
160 | static void consumer_rcu_free_relayd(struct rcu_head *head) | |
161 | { | |
162 | struct lttng_ht_node_ulong *node = | |
163 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
164 | struct consumer_relayd_sock_pair *relayd = | |
165 | caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
166 | ||
167 | free(relayd); | |
168 | } | |
169 | ||
170 | /* | |
171 | * Destroy and free relayd socket pair object. | |
172 | * | |
173 | * This function MUST be called with the consumer_data lock acquired. | |
174 | */ | |
175 | void consumer_destroy_relayd(struct consumer_relayd_sock_pair *relayd) | |
176 | { | |
177 | int ret; | |
178 | struct lttng_ht_iter iter; | |
179 | ||
173af62f DG |
180 | if (relayd == NULL) { |
181 | return; | |
182 | } | |
183 | ||
00e2e675 DG |
184 | DBG("Consumer destroy and close relayd socket pair"); |
185 | ||
186 | iter.iter.node = &relayd->node.node; | |
187 | ret = lttng_ht_del(consumer_data.relayd_ht, &iter); | |
173af62f DG |
188 | if (ret != 0) { |
189 | /* We assume the relayd was already destroyed */ | |
190 | return; | |
191 | } | |
00e2e675 DG |
192 | |
193 | /* Close all sockets */ | |
194 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
195 | (void) relayd_close(&relayd->control_sock); | |
196 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
197 | (void) relayd_close(&relayd->data_sock); | |
198 | ||
199 | /* RCU free() call */ | |
200 | call_rcu(&relayd->node.head, consumer_rcu_free_relayd); | |
201 | } | |
202 | ||
3bd1e081 MD |
203 | /* |
204 | * Remove a stream from the global list protected by a mutex. This | |
205 | * function is also responsible for freeing its data structures. | |
206 | */ | |
207 | void consumer_del_stream(struct lttng_consumer_stream *stream) | |
208 | { | |
209 | int ret; | |
e4421fec | 210 | struct lttng_ht_iter iter; |
3bd1e081 | 211 | struct lttng_consumer_channel *free_chan = NULL; |
00e2e675 DG |
212 | struct consumer_relayd_sock_pair *relayd; |
213 | ||
214 | assert(stream); | |
3bd1e081 MD |
215 | |
216 | pthread_mutex_lock(&consumer_data.lock); | |
217 | ||
218 | switch (consumer_data.type) { | |
219 | case LTTNG_CONSUMER_KERNEL: | |
220 | if (stream->mmap_base != NULL) { | |
221 | ret = munmap(stream->mmap_base, stream->mmap_len); | |
222 | if (ret != 0) { | |
223 | perror("munmap"); | |
224 | } | |
225 | } | |
226 | break; | |
7753dea8 MD |
227 | case LTTNG_CONSUMER32_UST: |
228 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
229 | lttng_ustconsumer_del_stream(stream); |
230 | break; | |
231 | default: | |
232 | ERR("Unknown consumer_data type"); | |
233 | assert(0); | |
234 | goto end; | |
235 | } | |
236 | ||
6065ceec | 237 | rcu_read_lock(); |
04253271 MD |
238 | iter.iter.node = &stream->node.node; |
239 | ret = lttng_ht_del(consumer_data.stream_ht, &iter); | |
240 | assert(!ret); | |
e4421fec | 241 | |
6065ceec DG |
242 | rcu_read_unlock(); |
243 | ||
3bd1e081 MD |
244 | if (consumer_data.stream_count <= 0) { |
245 | goto end; | |
246 | } | |
247 | consumer_data.stream_count--; | |
248 | if (!stream) { | |
249 | goto end; | |
250 | } | |
251 | if (stream->out_fd >= 0) { | |
4c462e79 MD |
252 | ret = close(stream->out_fd); |
253 | if (ret) { | |
254 | PERROR("close"); | |
255 | } | |
3bd1e081 | 256 | } |
b5c5fc29 | 257 | if (stream->wait_fd >= 0 && !stream->wait_fd_is_copy) { |
4c462e79 MD |
258 | ret = close(stream->wait_fd); |
259 | if (ret) { | |
260 | PERROR("close"); | |
261 | } | |
3bd1e081 | 262 | } |
2c1dd183 | 263 | if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) { |
4c462e79 MD |
264 | ret = close(stream->shm_fd); |
265 | if (ret) { | |
266 | PERROR("close"); | |
267 | } | |
3bd1e081 | 268 | } |
00e2e675 DG |
269 | |
270 | /* Check and cleanup relayd */ | |
b0b335c8 | 271 | rcu_read_lock(); |
00e2e675 DG |
272 | relayd = consumer_find_relayd(stream->net_seq_idx); |
273 | if (relayd != NULL) { | |
b0b335c8 MD |
274 | uatomic_dec(&relayd->refcount); |
275 | assert(uatomic_read(&relayd->refcount) >= 0); | |
173af62f DG |
276 | |
277 | ret = relayd_send_close_stream(&relayd->control_sock, | |
278 | stream->relayd_stream_id, | |
279 | stream->next_net_seq_num - 1); | |
280 | if (ret < 0) { | |
281 | ERR("Unable to close stream on the relayd. Continuing"); | |
282 | /* Continue here. There is nothing we can do for the relayd.*/ | |
283 | } | |
284 | ||
285 | /* Both conditions are met, we destroy the relayd. */ | |
286 | if (uatomic_read(&relayd->refcount) == 0 && | |
287 | uatomic_read(&relayd->destroy_flag)) { | |
00e2e675 DG |
288 | consumer_destroy_relayd(relayd); |
289 | } | |
00e2e675 | 290 | } |
b0b335c8 | 291 | rcu_read_unlock(); |
00e2e675 DG |
292 | |
293 | if (!--stream->chan->refcount) { | |
3bd1e081 | 294 | free_chan = stream->chan; |
00e2e675 DG |
295 | } |
296 | ||
702b1ea4 MD |
297 | |
298 | call_rcu(&stream->node.head, consumer_free_stream); | |
3bd1e081 MD |
299 | end: |
300 | consumer_data.need_update = 1; | |
301 | pthread_mutex_unlock(&consumer_data.lock); | |
302 | ||
303 | if (free_chan) | |
304 | consumer_del_channel(free_chan); | |
305 | } | |
306 | ||
307 | struct lttng_consumer_stream *consumer_allocate_stream( | |
308 | int channel_key, int stream_key, | |
309 | int shm_fd, int wait_fd, | |
310 | enum lttng_consumer_stream_state state, | |
311 | uint64_t mmap_len, | |
312 | enum lttng_event_output output, | |
6df2e2c9 MD |
313 | const char *path_name, |
314 | uid_t uid, | |
00e2e675 DG |
315 | gid_t gid, |
316 | int net_index, | |
317 | int metadata_flag) | |
3bd1e081 MD |
318 | { |
319 | struct lttng_consumer_stream *stream; | |
320 | int ret; | |
321 | ||
effcf122 | 322 | stream = zmalloc(sizeof(*stream)); |
3bd1e081 MD |
323 | if (stream == NULL) { |
324 | perror("malloc struct lttng_consumer_stream"); | |
325 | goto end; | |
326 | } | |
327 | stream->chan = consumer_find_channel(channel_key); | |
328 | if (!stream->chan) { | |
329 | perror("Unable to find channel key"); | |
330 | goto end; | |
331 | } | |
332 | stream->chan->refcount++; | |
333 | stream->key = stream_key; | |
334 | stream->shm_fd = shm_fd; | |
335 | stream->wait_fd = wait_fd; | |
336 | stream->out_fd = -1; | |
337 | stream->out_fd_offset = 0; | |
338 | stream->state = state; | |
339 | stream->mmap_len = mmap_len; | |
340 | stream->mmap_base = NULL; | |
341 | stream->output = output; | |
6df2e2c9 MD |
342 | stream->uid = uid; |
343 | stream->gid = gid; | |
00e2e675 DG |
344 | stream->net_seq_idx = net_index; |
345 | stream->metadata_flag = metadata_flag; | |
346 | strncpy(stream->path_name, path_name, sizeof(stream->path_name)); | |
347 | stream->path_name[sizeof(stream->path_name) - 1] = '\0'; | |
e4421fec | 348 | lttng_ht_node_init_ulong(&stream->node, stream->key); |
00e2e675 | 349 | lttng_ht_node_init_ulong(&stream->waitfd_node, stream->wait_fd); |
3bd1e081 MD |
350 | |
351 | switch (consumer_data.type) { | |
352 | case LTTNG_CONSUMER_KERNEL: | |
353 | break; | |
7753dea8 MD |
354 | case LTTNG_CONSUMER32_UST: |
355 | case LTTNG_CONSUMER64_UST: | |
5af2f756 | 356 | stream->cpu = stream->chan->cpucount++; |
3bd1e081 MD |
357 | ret = lttng_ustconsumer_allocate_stream(stream); |
358 | if (ret) { | |
359 | free(stream); | |
360 | return NULL; | |
361 | } | |
362 | break; | |
363 | default: | |
364 | ERR("Unknown consumer_data type"); | |
365 | assert(0); | |
366 | goto end; | |
367 | } | |
00e2e675 | 368 | DBG("Allocated stream %s (key %d, shm_fd %d, wait_fd %d, mmap_len %llu, out_fd %d, net_seq_idx %d)", |
3bd1e081 MD |
369 | stream->path_name, stream->key, |
370 | stream->shm_fd, | |
371 | stream->wait_fd, | |
372 | (unsigned long long) stream->mmap_len, | |
00e2e675 DG |
373 | stream->out_fd, |
374 | stream->net_seq_idx); | |
3bd1e081 MD |
375 | end: |
376 | return stream; | |
377 | } | |
378 | ||
379 | /* | |
380 | * Add a stream to the global list protected by a mutex. | |
381 | */ | |
382 | int consumer_add_stream(struct lttng_consumer_stream *stream) | |
383 | { | |
384 | int ret = 0; | |
c77fc10a DG |
385 | struct lttng_ht_node_ulong *node; |
386 | struct lttng_ht_iter iter; | |
00e2e675 | 387 | struct consumer_relayd_sock_pair *relayd; |
3bd1e081 MD |
388 | |
389 | pthread_mutex_lock(&consumer_data.lock); | |
7ad0a0cb MD |
390 | /* Steal stream identifier, for UST */ |
391 | consumer_steal_stream_key(stream->key); | |
c77fc10a | 392 | |
b0b335c8 | 393 | rcu_read_lock(); |
c77fc10a DG |
394 | lttng_ht_lookup(consumer_data.stream_ht, |
395 | (void *)((unsigned long) stream->key), &iter); | |
396 | node = lttng_ht_iter_get_node_ulong(&iter); | |
397 | if (node != NULL) { | |
398 | rcu_read_unlock(); | |
399 | /* Stream already exist. Ignore the insertion */ | |
400 | goto end; | |
401 | } | |
402 | ||
04253271 | 403 | lttng_ht_add_unique_ulong(consumer_data.stream_ht, &stream->node); |
00e2e675 DG |
404 | |
405 | /* Check and cleanup relayd */ | |
406 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
407 | if (relayd != NULL) { | |
b0b335c8 | 408 | uatomic_inc(&relayd->refcount); |
00e2e675 | 409 | } |
b0b335c8 | 410 | rcu_read_unlock(); |
00e2e675 DG |
411 | |
412 | /* Update consumer data */ | |
3bd1e081 MD |
413 | consumer_data.stream_count++; |
414 | consumer_data.need_update = 1; | |
415 | ||
416 | switch (consumer_data.type) { | |
417 | case LTTNG_CONSUMER_KERNEL: | |
418 | break; | |
7753dea8 MD |
419 | case LTTNG_CONSUMER32_UST: |
420 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
421 | /* Streams are in CPU number order (we rely on this) */ |
422 | stream->cpu = stream->chan->nr_streams++; | |
423 | break; | |
424 | default: | |
425 | ERR("Unknown consumer_data type"); | |
426 | assert(0); | |
427 | goto end; | |
428 | } | |
429 | ||
430 | end: | |
431 | pthread_mutex_unlock(&consumer_data.lock); | |
702b1ea4 | 432 | |
3bd1e081 MD |
433 | return ret; |
434 | } | |
435 | ||
00e2e675 DG |
436 | /* |
437 | * Add relayd socket to global consumer data hashtable. | |
438 | */ | |
439 | int consumer_add_relayd(struct consumer_relayd_sock_pair *relayd) | |
440 | { | |
441 | int ret = 0; | |
442 | struct lttng_ht_node_ulong *node; | |
443 | struct lttng_ht_iter iter; | |
444 | ||
445 | if (relayd == NULL) { | |
446 | ret = -1; | |
447 | goto end; | |
448 | } | |
449 | ||
450 | rcu_read_lock(); | |
451 | ||
452 | lttng_ht_lookup(consumer_data.relayd_ht, | |
453 | (void *)((unsigned long) relayd->net_seq_idx), &iter); | |
454 | node = lttng_ht_iter_get_node_ulong(&iter); | |
455 | if (node != NULL) { | |
456 | rcu_read_unlock(); | |
457 | /* Relayd already exist. Ignore the insertion */ | |
458 | goto end; | |
459 | } | |
460 | lttng_ht_add_unique_ulong(consumer_data.relayd_ht, &relayd->node); | |
461 | ||
462 | rcu_read_unlock(); | |
463 | ||
464 | end: | |
465 | return ret; | |
466 | } | |
467 | ||
468 | /* | |
469 | * Allocate and return a consumer relayd socket. | |
470 | */ | |
471 | struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair( | |
472 | int net_seq_idx) | |
473 | { | |
474 | struct consumer_relayd_sock_pair *obj = NULL; | |
475 | ||
476 | /* Negative net sequence index is a failure */ | |
477 | if (net_seq_idx < 0) { | |
478 | goto error; | |
479 | } | |
480 | ||
481 | obj = zmalloc(sizeof(struct consumer_relayd_sock_pair)); | |
482 | if (obj == NULL) { | |
483 | PERROR("zmalloc relayd sock"); | |
484 | goto error; | |
485 | } | |
486 | ||
487 | obj->net_seq_idx = net_seq_idx; | |
488 | obj->refcount = 0; | |
173af62f | 489 | obj->destroy_flag = 0; |
00e2e675 DG |
490 | lttng_ht_node_init_ulong(&obj->node, obj->net_seq_idx); |
491 | pthread_mutex_init(&obj->ctrl_sock_mutex, NULL); | |
492 | ||
493 | error: | |
494 | return obj; | |
495 | } | |
496 | ||
497 | /* | |
498 | * Find a relayd socket pair in the global consumer data. | |
499 | * | |
500 | * Return the object if found else NULL. | |
b0b335c8 MD |
501 | * RCU read-side lock must be held across this call and while using the |
502 | * returned object. | |
00e2e675 DG |
503 | */ |
504 | struct consumer_relayd_sock_pair *consumer_find_relayd(int key) | |
505 | { | |
506 | struct lttng_ht_iter iter; | |
507 | struct lttng_ht_node_ulong *node; | |
508 | struct consumer_relayd_sock_pair *relayd = NULL; | |
509 | ||
510 | /* Negative keys are lookup failures */ | |
511 | if (key < 0) { | |
512 | goto error; | |
513 | } | |
514 | ||
00e2e675 DG |
515 | lttng_ht_lookup(consumer_data.relayd_ht, (void *)((unsigned long) key), |
516 | &iter); | |
517 | node = lttng_ht_iter_get_node_ulong(&iter); | |
518 | if (node != NULL) { | |
519 | relayd = caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
520 | } | |
521 | ||
00e2e675 DG |
522 | error: |
523 | return relayd; | |
524 | } | |
525 | ||
526 | /* | |
527 | * Handle stream for relayd transmission if the stream applies for network | |
528 | * streaming where the net sequence index is set. | |
529 | * | |
530 | * Return destination file descriptor or negative value on error. | |
531 | */ | |
532 | int consumer_handle_stream_before_relayd(struct lttng_consumer_stream *stream, | |
533 | size_t data_size) | |
534 | { | |
535 | int outfd = -1, ret; | |
536 | struct consumer_relayd_sock_pair *relayd; | |
537 | struct lttcomm_relayd_data_hdr data_hdr; | |
538 | ||
539 | /* Safety net */ | |
540 | assert(stream); | |
541 | ||
542 | /* Reset data header */ | |
543 | memset(&data_hdr, 0, sizeof(data_hdr)); | |
544 | ||
b0b335c8 | 545 | rcu_read_lock(); |
00e2e675 DG |
546 | /* Get relayd reference of the stream. */ |
547 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
548 | if (relayd == NULL) { | |
549 | /* Stream is either local or corrupted */ | |
550 | goto error; | |
551 | } | |
552 | ||
553 | DBG("Consumer found relayd socks with index %d", stream->net_seq_idx); | |
554 | if (stream->metadata_flag) { | |
555 | /* Caller MUST acquire the relayd control socket lock */ | |
556 | ret = relayd_send_metadata(&relayd->control_sock, data_size); | |
557 | if (ret < 0) { | |
558 | goto error; | |
559 | } | |
560 | ||
561 | /* Metadata are always sent on the control socket. */ | |
562 | outfd = relayd->control_sock.fd; | |
563 | } else { | |
564 | /* Set header with stream information */ | |
565 | data_hdr.stream_id = htobe64(stream->relayd_stream_id); | |
566 | data_hdr.data_size = htobe32(data_size); | |
173af62f | 567 | data_hdr.net_seq_num = htobe64(stream->next_net_seq_num++); |
00e2e675 DG |
568 | /* Other fields are zeroed previously */ |
569 | ||
570 | ret = relayd_send_data_hdr(&relayd->data_sock, &data_hdr, | |
571 | sizeof(data_hdr)); | |
572 | if (ret < 0) { | |
573 | goto error; | |
574 | } | |
575 | ||
576 | /* Set to go on data socket */ | |
577 | outfd = relayd->data_sock.fd; | |
578 | } | |
579 | ||
580 | error: | |
b0b335c8 | 581 | rcu_read_unlock(); |
00e2e675 DG |
582 | return outfd; |
583 | } | |
584 | ||
3bd1e081 MD |
585 | /* |
586 | * Update a stream according to what we just received. | |
587 | */ | |
588 | void consumer_change_stream_state(int stream_key, | |
589 | enum lttng_consumer_stream_state state) | |
590 | { | |
591 | struct lttng_consumer_stream *stream; | |
592 | ||
593 | pthread_mutex_lock(&consumer_data.lock); | |
594 | stream = consumer_find_stream(stream_key); | |
595 | if (stream) { | |
596 | stream->state = state; | |
597 | } | |
598 | consumer_data.need_update = 1; | |
599 | pthread_mutex_unlock(&consumer_data.lock); | |
600 | } | |
601 | ||
702b1ea4 MD |
602 | static |
603 | void consumer_free_channel(struct rcu_head *head) | |
604 | { | |
605 | struct lttng_ht_node_ulong *node = | |
606 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
607 | struct lttng_consumer_channel *channel = | |
608 | caa_container_of(node, struct lttng_consumer_channel, node); | |
609 | ||
610 | free(channel); | |
611 | } | |
612 | ||
3bd1e081 MD |
613 | /* |
614 | * Remove a channel from the global list protected by a mutex. This | |
615 | * function is also responsible for freeing its data structures. | |
616 | */ | |
617 | void consumer_del_channel(struct lttng_consumer_channel *channel) | |
618 | { | |
619 | int ret; | |
e4421fec | 620 | struct lttng_ht_iter iter; |
3bd1e081 MD |
621 | |
622 | pthread_mutex_lock(&consumer_data.lock); | |
623 | ||
624 | switch (consumer_data.type) { | |
625 | case LTTNG_CONSUMER_KERNEL: | |
626 | break; | |
7753dea8 MD |
627 | case LTTNG_CONSUMER32_UST: |
628 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
629 | lttng_ustconsumer_del_channel(channel); |
630 | break; | |
631 | default: | |
632 | ERR("Unknown consumer_data type"); | |
633 | assert(0); | |
634 | goto end; | |
635 | } | |
636 | ||
6065ceec | 637 | rcu_read_lock(); |
04253271 MD |
638 | iter.iter.node = &channel->node.node; |
639 | ret = lttng_ht_del(consumer_data.channel_ht, &iter); | |
640 | assert(!ret); | |
6065ceec DG |
641 | rcu_read_unlock(); |
642 | ||
3bd1e081 MD |
643 | if (channel->mmap_base != NULL) { |
644 | ret = munmap(channel->mmap_base, channel->mmap_len); | |
645 | if (ret != 0) { | |
646 | perror("munmap"); | |
647 | } | |
648 | } | |
b5c5fc29 | 649 | if (channel->wait_fd >= 0 && !channel->wait_fd_is_copy) { |
4c462e79 MD |
650 | ret = close(channel->wait_fd); |
651 | if (ret) { | |
652 | PERROR("close"); | |
653 | } | |
3bd1e081 | 654 | } |
2c1dd183 | 655 | if (channel->shm_fd >= 0 && channel->wait_fd != channel->shm_fd) { |
4c462e79 MD |
656 | ret = close(channel->shm_fd); |
657 | if (ret) { | |
658 | PERROR("close"); | |
659 | } | |
3bd1e081 | 660 | } |
702b1ea4 MD |
661 | |
662 | call_rcu(&channel->node.head, consumer_free_channel); | |
3bd1e081 MD |
663 | end: |
664 | pthread_mutex_unlock(&consumer_data.lock); | |
665 | } | |
666 | ||
667 | struct lttng_consumer_channel *consumer_allocate_channel( | |
668 | int channel_key, | |
669 | int shm_fd, int wait_fd, | |
670 | uint64_t mmap_len, | |
671 | uint64_t max_sb_size) | |
672 | { | |
673 | struct lttng_consumer_channel *channel; | |
674 | int ret; | |
675 | ||
276b26d1 | 676 | channel = zmalloc(sizeof(*channel)); |
3bd1e081 MD |
677 | if (channel == NULL) { |
678 | perror("malloc struct lttng_consumer_channel"); | |
679 | goto end; | |
680 | } | |
681 | channel->key = channel_key; | |
682 | channel->shm_fd = shm_fd; | |
683 | channel->wait_fd = wait_fd; | |
684 | channel->mmap_len = mmap_len; | |
685 | channel->max_sb_size = max_sb_size; | |
686 | channel->refcount = 0; | |
687 | channel->nr_streams = 0; | |
e4421fec | 688 | lttng_ht_node_init_ulong(&channel->node, channel->key); |
3bd1e081 MD |
689 | |
690 | switch (consumer_data.type) { | |
691 | case LTTNG_CONSUMER_KERNEL: | |
692 | channel->mmap_base = NULL; | |
693 | channel->mmap_len = 0; | |
694 | break; | |
7753dea8 MD |
695 | case LTTNG_CONSUMER32_UST: |
696 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
697 | ret = lttng_ustconsumer_allocate_channel(channel); |
698 | if (ret) { | |
699 | free(channel); | |
700 | return NULL; | |
701 | } | |
702 | break; | |
703 | default: | |
704 | ERR("Unknown consumer_data type"); | |
705 | assert(0); | |
706 | goto end; | |
707 | } | |
708 | DBG("Allocated channel (key %d, shm_fd %d, wait_fd %d, mmap_len %llu, max_sb_size %llu)", | |
00e2e675 | 709 | channel->key, channel->shm_fd, channel->wait_fd, |
3bd1e081 MD |
710 | (unsigned long long) channel->mmap_len, |
711 | (unsigned long long) channel->max_sb_size); | |
712 | end: | |
713 | return channel; | |
714 | } | |
715 | ||
716 | /* | |
717 | * Add a channel to the global list protected by a mutex. | |
718 | */ | |
719 | int consumer_add_channel(struct lttng_consumer_channel *channel) | |
720 | { | |
c77fc10a DG |
721 | struct lttng_ht_node_ulong *node; |
722 | struct lttng_ht_iter iter; | |
723 | ||
3bd1e081 | 724 | pthread_mutex_lock(&consumer_data.lock); |
7ad0a0cb MD |
725 | /* Steal channel identifier, for UST */ |
726 | consumer_steal_channel_key(channel->key); | |
6065ceec | 727 | rcu_read_lock(); |
c77fc10a DG |
728 | |
729 | lttng_ht_lookup(consumer_data.channel_ht, | |
730 | (void *)((unsigned long) channel->key), &iter); | |
731 | node = lttng_ht_iter_get_node_ulong(&iter); | |
732 | if (node != NULL) { | |
733 | /* Channel already exist. Ignore the insertion */ | |
734 | goto end; | |
735 | } | |
736 | ||
04253271 | 737 | lttng_ht_add_unique_ulong(consumer_data.channel_ht, &channel->node); |
c77fc10a DG |
738 | |
739 | end: | |
6065ceec | 740 | rcu_read_unlock(); |
3bd1e081 | 741 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 742 | |
7ad0a0cb | 743 | return 0; |
3bd1e081 MD |
744 | } |
745 | ||
746 | /* | |
747 | * Allocate the pollfd structure and the local view of the out fds to avoid | |
748 | * doing a lookup in the linked list and concurrency issues when writing is | |
749 | * needed. Called with consumer_data.lock held. | |
750 | * | |
751 | * Returns the number of fds in the structures. | |
752 | */ | |
753 | int consumer_update_poll_array( | |
754 | struct lttng_consumer_local_data *ctx, struct pollfd **pollfd, | |
00e2e675 DG |
755 | struct lttng_consumer_stream **local_stream, |
756 | struct lttng_ht *metadata_ht) | |
3bd1e081 | 757 | { |
3bd1e081 | 758 | int i = 0; |
e4421fec DG |
759 | struct lttng_ht_iter iter; |
760 | struct lttng_consumer_stream *stream; | |
3bd1e081 MD |
761 | |
762 | DBG("Updating poll fd array"); | |
481d6c57 | 763 | rcu_read_lock(); |
e4421fec DG |
764 | cds_lfht_for_each_entry(consumer_data.stream_ht->ht, &iter.iter, stream, |
765 | node.node) { | |
766 | if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM) { | |
3bd1e081 MD |
767 | continue; |
768 | } | |
e4421fec DG |
769 | DBG("Active FD %d", stream->wait_fd); |
770 | (*pollfd)[i].fd = stream->wait_fd; | |
3bd1e081 | 771 | (*pollfd)[i].events = POLLIN | POLLPRI; |
00e2e675 DG |
772 | if (stream->metadata_flag && metadata_ht) { |
773 | lttng_ht_add_unique_ulong(metadata_ht, &stream->waitfd_node); | |
774 | DBG("Active FD added to metadata hash table"); | |
775 | } | |
e4421fec | 776 | local_stream[i] = stream; |
3bd1e081 MD |
777 | i++; |
778 | } | |
481d6c57 | 779 | rcu_read_unlock(); |
3bd1e081 MD |
780 | |
781 | /* | |
782 | * Insert the consumer_poll_pipe at the end of the array and don't | |
783 | * increment i so nb_fd is the number of real FD. | |
784 | */ | |
785 | (*pollfd)[i].fd = ctx->consumer_poll_pipe[0]; | |
509bb1cf | 786 | (*pollfd)[i].events = POLLIN | POLLPRI; |
3bd1e081 MD |
787 | return i; |
788 | } | |
789 | ||
790 | /* | |
791 | * Poll on the should_quit pipe and the command socket return -1 on error and | |
792 | * should exit, 0 if data is available on the command socket | |
793 | */ | |
794 | int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll) | |
795 | { | |
796 | int num_rdy; | |
797 | ||
88f2b785 | 798 | restart: |
3bd1e081 MD |
799 | num_rdy = poll(consumer_sockpoll, 2, -1); |
800 | if (num_rdy == -1) { | |
88f2b785 MD |
801 | /* |
802 | * Restart interrupted system call. | |
803 | */ | |
804 | if (errno == EINTR) { | |
805 | goto restart; | |
806 | } | |
3bd1e081 MD |
807 | perror("Poll error"); |
808 | goto exit; | |
809 | } | |
509bb1cf | 810 | if (consumer_sockpoll[0].revents & (POLLIN | POLLPRI)) { |
3bd1e081 MD |
811 | DBG("consumer_should_quit wake up"); |
812 | goto exit; | |
813 | } | |
814 | return 0; | |
815 | ||
816 | exit: | |
817 | return -1; | |
818 | } | |
819 | ||
820 | /* | |
821 | * Set the error socket. | |
822 | */ | |
823 | void lttng_consumer_set_error_sock( | |
824 | struct lttng_consumer_local_data *ctx, int sock) | |
825 | { | |
826 | ctx->consumer_error_socket = sock; | |
827 | } | |
828 | ||
829 | /* | |
830 | * Set the command socket path. | |
831 | */ | |
3bd1e081 MD |
832 | void lttng_consumer_set_command_sock_path( |
833 | struct lttng_consumer_local_data *ctx, char *sock) | |
834 | { | |
835 | ctx->consumer_command_sock_path = sock; | |
836 | } | |
837 | ||
838 | /* | |
839 | * Send return code to the session daemon. | |
840 | * If the socket is not defined, we return 0, it is not a fatal error | |
841 | */ | |
842 | int lttng_consumer_send_error( | |
843 | struct lttng_consumer_local_data *ctx, int cmd) | |
844 | { | |
845 | if (ctx->consumer_error_socket > 0) { | |
846 | return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd, | |
847 | sizeof(enum lttcomm_sessiond_command)); | |
848 | } | |
849 | ||
850 | return 0; | |
851 | } | |
852 | ||
853 | /* | |
854 | * Close all the tracefiles and stream fds, should be called when all instances | |
855 | * are destroyed. | |
856 | */ | |
857 | void lttng_consumer_cleanup(void) | |
858 | { | |
e4421fec | 859 | struct lttng_ht_iter iter; |
6065ceec DG |
860 | struct lttng_ht_node_ulong *node; |
861 | ||
862 | rcu_read_lock(); | |
3bd1e081 MD |
863 | |
864 | /* | |
6065ceec DG |
865 | * close all outfd. Called when there are no more threads running (after |
866 | * joining on the threads), no need to protect list iteration with mutex. | |
3bd1e081 | 867 | */ |
6065ceec DG |
868 | cds_lfht_for_each_entry(consumer_data.stream_ht->ht, &iter.iter, node, |
869 | node) { | |
702b1ea4 MD |
870 | struct lttng_consumer_stream *stream = |
871 | caa_container_of(node, struct lttng_consumer_stream, node); | |
872 | consumer_del_stream(stream); | |
3bd1e081 | 873 | } |
e4421fec | 874 | |
6065ceec DG |
875 | cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, node, |
876 | node) { | |
702b1ea4 MD |
877 | struct lttng_consumer_channel *channel = |
878 | caa_container_of(node, struct lttng_consumer_channel, node); | |
879 | consumer_del_channel(channel); | |
3bd1e081 | 880 | } |
6065ceec DG |
881 | |
882 | rcu_read_unlock(); | |
d6ce1df2 MD |
883 | |
884 | lttng_ht_destroy(consumer_data.stream_ht); | |
885 | lttng_ht_destroy(consumer_data.channel_ht); | |
3bd1e081 MD |
886 | } |
887 | ||
888 | /* | |
889 | * Called from signal handler. | |
890 | */ | |
891 | void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx) | |
892 | { | |
893 | int ret; | |
894 | consumer_quit = 1; | |
6f94560a MD |
895 | do { |
896 | ret = write(ctx->consumer_should_quit[1], "4", 1); | |
897 | } while (ret < 0 && errno == EINTR); | |
3bd1e081 MD |
898 | if (ret < 0) { |
899 | perror("write consumer quit"); | |
900 | } | |
901 | } | |
902 | ||
00e2e675 DG |
903 | void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream, |
904 | off_t orig_offset) | |
3bd1e081 MD |
905 | { |
906 | int outfd = stream->out_fd; | |
907 | ||
908 | /* | |
909 | * This does a blocking write-and-wait on any page that belongs to the | |
910 | * subbuffer prior to the one we just wrote. | |
911 | * Don't care about error values, as these are just hints and ways to | |
912 | * limit the amount of page cache used. | |
913 | */ | |
914 | if (orig_offset < stream->chan->max_sb_size) { | |
915 | return; | |
916 | } | |
b9182dd9 | 917 | lttng_sync_file_range(outfd, orig_offset - stream->chan->max_sb_size, |
3bd1e081 MD |
918 | stream->chan->max_sb_size, |
919 | SYNC_FILE_RANGE_WAIT_BEFORE | |
920 | | SYNC_FILE_RANGE_WRITE | |
921 | | SYNC_FILE_RANGE_WAIT_AFTER); | |
922 | /* | |
923 | * Give hints to the kernel about how we access the file: | |
924 | * POSIX_FADV_DONTNEED : we won't re-access data in a near future after | |
925 | * we write it. | |
926 | * | |
927 | * We need to call fadvise again after the file grows because the | |
928 | * kernel does not seem to apply fadvise to non-existing parts of the | |
929 | * file. | |
930 | * | |
931 | * Call fadvise _after_ having waited for the page writeback to | |
932 | * complete because the dirty page writeback semantic is not well | |
933 | * defined. So it can be expected to lead to lower throughput in | |
934 | * streaming. | |
935 | */ | |
936 | posix_fadvise(outfd, orig_offset - stream->chan->max_sb_size, | |
937 | stream->chan->max_sb_size, POSIX_FADV_DONTNEED); | |
938 | } | |
939 | ||
940 | /* | |
941 | * Initialise the necessary environnement : | |
942 | * - create a new context | |
943 | * - create the poll_pipe | |
944 | * - create the should_quit pipe (for signal handler) | |
945 | * - create the thread pipe (for splice) | |
946 | * | |
947 | * Takes a function pointer as argument, this function is called when data is | |
948 | * available on a buffer. This function is responsible to do the | |
949 | * kernctl_get_next_subbuf, read the data with mmap or splice depending on the | |
950 | * buffer configuration and then kernctl_put_next_subbuf at the end. | |
951 | * | |
952 | * Returns a pointer to the new context or NULL on error. | |
953 | */ | |
954 | struct lttng_consumer_local_data *lttng_consumer_create( | |
955 | enum lttng_consumer_type type, | |
4078b776 | 956 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
d41f73b7 | 957 | struct lttng_consumer_local_data *ctx), |
3bd1e081 MD |
958 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
959 | int (*recv_stream)(struct lttng_consumer_stream *stream), | |
960 | int (*update_stream)(int stream_key, uint32_t state)) | |
961 | { | |
962 | int ret, i; | |
963 | struct lttng_consumer_local_data *ctx; | |
964 | ||
965 | assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN || | |
966 | consumer_data.type == type); | |
967 | consumer_data.type = type; | |
968 | ||
effcf122 | 969 | ctx = zmalloc(sizeof(struct lttng_consumer_local_data)); |
3bd1e081 MD |
970 | if (ctx == NULL) { |
971 | perror("allocating context"); | |
972 | goto error; | |
973 | } | |
974 | ||
975 | ctx->consumer_error_socket = -1; | |
976 | /* assign the callbacks */ | |
977 | ctx->on_buffer_ready = buffer_ready; | |
978 | ctx->on_recv_channel = recv_channel; | |
979 | ctx->on_recv_stream = recv_stream; | |
980 | ctx->on_update_stream = update_stream; | |
981 | ||
982 | ret = pipe(ctx->consumer_poll_pipe); | |
983 | if (ret < 0) { | |
984 | perror("Error creating poll pipe"); | |
985 | goto error_poll_pipe; | |
986 | } | |
987 | ||
04fdd819 MD |
988 | /* set read end of the pipe to non-blocking */ |
989 | ret = fcntl(ctx->consumer_poll_pipe[0], F_SETFL, O_NONBLOCK); | |
990 | if (ret < 0) { | |
991 | perror("fcntl O_NONBLOCK"); | |
992 | goto error_poll_fcntl; | |
993 | } | |
994 | ||
995 | /* set write end of the pipe to non-blocking */ | |
996 | ret = fcntl(ctx->consumer_poll_pipe[1], F_SETFL, O_NONBLOCK); | |
997 | if (ret < 0) { | |
998 | perror("fcntl O_NONBLOCK"); | |
999 | goto error_poll_fcntl; | |
1000 | } | |
1001 | ||
3bd1e081 MD |
1002 | ret = pipe(ctx->consumer_should_quit); |
1003 | if (ret < 0) { | |
1004 | perror("Error creating recv pipe"); | |
1005 | goto error_quit_pipe; | |
1006 | } | |
1007 | ||
1008 | ret = pipe(ctx->consumer_thread_pipe); | |
1009 | if (ret < 0) { | |
1010 | perror("Error creating thread pipe"); | |
1011 | goto error_thread_pipe; | |
1012 | } | |
1013 | ||
1014 | return ctx; | |
1015 | ||
1016 | ||
1017 | error_thread_pipe: | |
1018 | for (i = 0; i < 2; i++) { | |
1019 | int err; | |
1020 | ||
1021 | err = close(ctx->consumer_should_quit[i]); | |
4c462e79 MD |
1022 | if (err) { |
1023 | PERROR("close"); | |
1024 | } | |
3bd1e081 | 1025 | } |
04fdd819 | 1026 | error_poll_fcntl: |
3bd1e081 MD |
1027 | error_quit_pipe: |
1028 | for (i = 0; i < 2; i++) { | |
1029 | int err; | |
1030 | ||
1031 | err = close(ctx->consumer_poll_pipe[i]); | |
4c462e79 MD |
1032 | if (err) { |
1033 | PERROR("close"); | |
1034 | } | |
3bd1e081 MD |
1035 | } |
1036 | error_poll_pipe: | |
1037 | free(ctx); | |
1038 | error: | |
1039 | return NULL; | |
1040 | } | |
1041 | ||
1042 | /* | |
1043 | * Close all fds associated with the instance and free the context. | |
1044 | */ | |
1045 | void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx) | |
1046 | { | |
4c462e79 MD |
1047 | int ret; |
1048 | ||
1049 | ret = close(ctx->consumer_error_socket); | |
1050 | if (ret) { | |
1051 | PERROR("close"); | |
1052 | } | |
1053 | ret = close(ctx->consumer_thread_pipe[0]); | |
1054 | if (ret) { | |
1055 | PERROR("close"); | |
1056 | } | |
1057 | ret = close(ctx->consumer_thread_pipe[1]); | |
1058 | if (ret) { | |
1059 | PERROR("close"); | |
1060 | } | |
1061 | ret = close(ctx->consumer_poll_pipe[0]); | |
1062 | if (ret) { | |
1063 | PERROR("close"); | |
1064 | } | |
1065 | ret = close(ctx->consumer_poll_pipe[1]); | |
1066 | if (ret) { | |
1067 | PERROR("close"); | |
1068 | } | |
1069 | ret = close(ctx->consumer_should_quit[0]); | |
1070 | if (ret) { | |
1071 | PERROR("close"); | |
1072 | } | |
1073 | ret = close(ctx->consumer_should_quit[1]); | |
1074 | if (ret) { | |
1075 | PERROR("close"); | |
1076 | } | |
3bd1e081 MD |
1077 | unlink(ctx->consumer_command_sock_path); |
1078 | free(ctx); | |
1079 | } | |
1080 | ||
1081 | /* | |
1082 | * Mmap the ring buffer, read it and write the data to the tracefile. | |
1083 | * | |
1084 | * Returns the number of bytes written | |
1085 | */ | |
4078b776 | 1086 | ssize_t lttng_consumer_on_read_subbuffer_mmap( |
3bd1e081 MD |
1087 | struct lttng_consumer_local_data *ctx, |
1088 | struct lttng_consumer_stream *stream, unsigned long len) | |
1089 | { | |
1090 | switch (consumer_data.type) { | |
1091 | case LTTNG_CONSUMER_KERNEL: | |
1092 | return lttng_kconsumer_on_read_subbuffer_mmap(ctx, stream, len); | |
7753dea8 MD |
1093 | case LTTNG_CONSUMER32_UST: |
1094 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1095 | return lttng_ustconsumer_on_read_subbuffer_mmap(ctx, stream, len); |
1096 | default: | |
1097 | ERR("Unknown consumer_data type"); | |
1098 | assert(0); | |
1099 | } | |
b9182dd9 DG |
1100 | |
1101 | return 0; | |
3bd1e081 MD |
1102 | } |
1103 | ||
1104 | /* | |
1105 | * Splice the data from the ring buffer to the tracefile. | |
1106 | * | |
1107 | * Returns the number of bytes spliced. | |
1108 | */ | |
4078b776 | 1109 | ssize_t lttng_consumer_on_read_subbuffer_splice( |
3bd1e081 MD |
1110 | struct lttng_consumer_local_data *ctx, |
1111 | struct lttng_consumer_stream *stream, unsigned long len) | |
1112 | { | |
1113 | switch (consumer_data.type) { | |
1114 | case LTTNG_CONSUMER_KERNEL: | |
1115 | return lttng_kconsumer_on_read_subbuffer_splice(ctx, stream, len); | |
7753dea8 MD |
1116 | case LTTNG_CONSUMER32_UST: |
1117 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1118 | return -ENOSYS; |
1119 | default: | |
1120 | ERR("Unknown consumer_data type"); | |
1121 | assert(0); | |
1122 | return -ENOSYS; | |
1123 | } | |
1124 | ||
1125 | } | |
1126 | ||
1127 | /* | |
1128 | * Take a snapshot for a specific fd | |
1129 | * | |
1130 | * Returns 0 on success, < 0 on error | |
1131 | */ | |
1132 | int lttng_consumer_take_snapshot(struct lttng_consumer_local_data *ctx, | |
1133 | struct lttng_consumer_stream *stream) | |
1134 | { | |
1135 | switch (consumer_data.type) { | |
1136 | case LTTNG_CONSUMER_KERNEL: | |
1137 | return lttng_kconsumer_take_snapshot(ctx, stream); | |
7753dea8 MD |
1138 | case LTTNG_CONSUMER32_UST: |
1139 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1140 | return lttng_ustconsumer_take_snapshot(ctx, stream); |
1141 | default: | |
1142 | ERR("Unknown consumer_data type"); | |
1143 | assert(0); | |
1144 | return -ENOSYS; | |
1145 | } | |
1146 | ||
1147 | } | |
1148 | ||
1149 | /* | |
1150 | * Get the produced position | |
1151 | * | |
1152 | * Returns 0 on success, < 0 on error | |
1153 | */ | |
1154 | int lttng_consumer_get_produced_snapshot( | |
1155 | struct lttng_consumer_local_data *ctx, | |
1156 | struct lttng_consumer_stream *stream, | |
1157 | unsigned long *pos) | |
1158 | { | |
1159 | switch (consumer_data.type) { | |
1160 | case LTTNG_CONSUMER_KERNEL: | |
1161 | return lttng_kconsumer_get_produced_snapshot(ctx, stream, pos); | |
7753dea8 MD |
1162 | case LTTNG_CONSUMER32_UST: |
1163 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1164 | return lttng_ustconsumer_get_produced_snapshot(ctx, stream, pos); |
1165 | default: | |
1166 | ERR("Unknown consumer_data type"); | |
1167 | assert(0); | |
1168 | return -ENOSYS; | |
1169 | } | |
1170 | } | |
1171 | ||
1172 | int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, | |
1173 | int sock, struct pollfd *consumer_sockpoll) | |
1174 | { | |
1175 | switch (consumer_data.type) { | |
1176 | case LTTNG_CONSUMER_KERNEL: | |
1177 | return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
7753dea8 MD |
1178 | case LTTNG_CONSUMER32_UST: |
1179 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1180 | return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll); |
1181 | default: | |
1182 | ERR("Unknown consumer_data type"); | |
1183 | assert(0); | |
1184 | return -ENOSYS; | |
1185 | } | |
1186 | } | |
1187 | ||
1188 | /* | |
e4421fec | 1189 | * This thread polls the fds in the set to consume the data and write |
3bd1e081 MD |
1190 | * it to tracefile if necessary. |
1191 | */ | |
1192 | void *lttng_consumer_thread_poll_fds(void *data) | |
1193 | { | |
1194 | int num_rdy, num_hup, high_prio, ret, i; | |
1195 | struct pollfd *pollfd = NULL; | |
1196 | /* local view of the streams */ | |
1197 | struct lttng_consumer_stream **local_stream = NULL; | |
1198 | /* local view of consumer_data.fds_count */ | |
1199 | int nb_fd = 0; | |
3bd1e081 | 1200 | struct lttng_consumer_local_data *ctx = data; |
00e2e675 DG |
1201 | struct lttng_ht *metadata_ht; |
1202 | struct lttng_ht_iter iter; | |
1203 | struct lttng_ht_node_ulong *node; | |
1204 | struct lttng_consumer_stream *metadata_stream; | |
1205 | ssize_t len; | |
1206 | ||
1207 | metadata_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
3bd1e081 | 1208 | |
e7b994a3 DG |
1209 | rcu_register_thread(); |
1210 | ||
effcf122 | 1211 | local_stream = zmalloc(sizeof(struct lttng_consumer_stream)); |
3bd1e081 MD |
1212 | |
1213 | while (1) { | |
1214 | high_prio = 0; | |
1215 | num_hup = 0; | |
1216 | ||
1217 | /* | |
e4421fec | 1218 | * the fds set has been updated, we need to update our |
3bd1e081 MD |
1219 | * local array as well |
1220 | */ | |
1221 | pthread_mutex_lock(&consumer_data.lock); | |
1222 | if (consumer_data.need_update) { | |
1223 | if (pollfd != NULL) { | |
1224 | free(pollfd); | |
1225 | pollfd = NULL; | |
1226 | } | |
1227 | if (local_stream != NULL) { | |
1228 | free(local_stream); | |
1229 | local_stream = NULL; | |
1230 | } | |
1231 | ||
1232 | /* allocate for all fds + 1 for the consumer_poll_pipe */ | |
effcf122 | 1233 | pollfd = zmalloc((consumer_data.stream_count + 1) * sizeof(struct pollfd)); |
3bd1e081 MD |
1234 | if (pollfd == NULL) { |
1235 | perror("pollfd malloc"); | |
1236 | pthread_mutex_unlock(&consumer_data.lock); | |
1237 | goto end; | |
1238 | } | |
1239 | ||
1240 | /* allocate for all fds + 1 for the consumer_poll_pipe */ | |
effcf122 | 1241 | local_stream = zmalloc((consumer_data.stream_count + 1) * |
3bd1e081 MD |
1242 | sizeof(struct lttng_consumer_stream)); |
1243 | if (local_stream == NULL) { | |
1244 | perror("local_stream malloc"); | |
1245 | pthread_mutex_unlock(&consumer_data.lock); | |
1246 | goto end; | |
1247 | } | |
00e2e675 DG |
1248 | ret = consumer_update_poll_array(ctx, &pollfd, local_stream, |
1249 | metadata_ht); | |
3bd1e081 MD |
1250 | if (ret < 0) { |
1251 | ERR("Error in allocating pollfd or local_outfds"); | |
1252 | lttng_consumer_send_error(ctx, CONSUMERD_POLL_ERROR); | |
1253 | pthread_mutex_unlock(&consumer_data.lock); | |
1254 | goto end; | |
1255 | } | |
1256 | nb_fd = ret; | |
1257 | consumer_data.need_update = 0; | |
1258 | } | |
1259 | pthread_mutex_unlock(&consumer_data.lock); | |
1260 | ||
4078b776 MD |
1261 | /* No FDs and consumer_quit, consumer_cleanup the thread */ |
1262 | if (nb_fd == 0 && consumer_quit == 1) { | |
1263 | goto end; | |
1264 | } | |
3bd1e081 | 1265 | /* poll on the array of fds */ |
88f2b785 | 1266 | restart: |
3bd1e081 MD |
1267 | DBG("polling on %d fd", nb_fd + 1); |
1268 | num_rdy = poll(pollfd, nb_fd + 1, consumer_poll_timeout); | |
1269 | DBG("poll num_rdy : %d", num_rdy); | |
1270 | if (num_rdy == -1) { | |
88f2b785 MD |
1271 | /* |
1272 | * Restart interrupted system call. | |
1273 | */ | |
1274 | if (errno == EINTR) { | |
1275 | goto restart; | |
1276 | } | |
3bd1e081 MD |
1277 | perror("Poll error"); |
1278 | lttng_consumer_send_error(ctx, CONSUMERD_POLL_ERROR); | |
1279 | goto end; | |
1280 | } else if (num_rdy == 0) { | |
1281 | DBG("Polling thread timed out"); | |
1282 | goto end; | |
1283 | } | |
1284 | ||
3bd1e081 | 1285 | /* |
00e2e675 DG |
1286 | * If the consumer_poll_pipe triggered poll go directly to the |
1287 | * beginning of the loop to update the array. We want to prioritize | |
1288 | * array update over low-priority reads. | |
3bd1e081 | 1289 | */ |
509bb1cf | 1290 | if (pollfd[nb_fd].revents & (POLLIN | POLLPRI)) { |
04fdd819 MD |
1291 | size_t pipe_readlen; |
1292 | char tmp; | |
1293 | ||
3bd1e081 | 1294 | DBG("consumer_poll_pipe wake up"); |
04fdd819 MD |
1295 | /* Consume 1 byte of pipe data */ |
1296 | do { | |
1297 | pipe_readlen = read(ctx->consumer_poll_pipe[0], &tmp, 1); | |
1298 | } while (pipe_readlen == -1 && errno == EINTR); | |
3bd1e081 MD |
1299 | continue; |
1300 | } | |
1301 | ||
1302 | /* Take care of high priority channels first. */ | |
1303 | for (i = 0; i < nb_fd; i++) { | |
00e2e675 DG |
1304 | /* Lookup for metadata which is the highest priority */ |
1305 | lttng_ht_lookup(metadata_ht, | |
1306 | (void *)((unsigned long) pollfd[i].fd), &iter); | |
1307 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1308 | if (node != NULL && | |
1309 | (pollfd[i].revents & (POLLIN | POLLPRI))) { | |
1310 | DBG("Urgent metadata read on fd %d", pollfd[i].fd); | |
1311 | metadata_stream = caa_container_of(node, | |
1312 | struct lttng_consumer_stream, waitfd_node); | |
1313 | high_prio = 1; | |
1314 | len = ctx->on_buffer_ready(metadata_stream, ctx); | |
1315 | /* it's ok to have an unavailable sub-buffer */ | |
1316 | if (len < 0 && len != -EAGAIN) { | |
1317 | goto end; | |
1318 | } else if (len > 0) { | |
1319 | metadata_stream->data_read = 1; | |
1320 | } | |
1321 | } else if (pollfd[i].revents & POLLPRI) { | |
d41f73b7 MD |
1322 | DBG("Urgent read on fd %d", pollfd[i].fd); |
1323 | high_prio = 1; | |
4078b776 | 1324 | len = ctx->on_buffer_ready(local_stream[i], ctx); |
d41f73b7 | 1325 | /* it's ok to have an unavailable sub-buffer */ |
4078b776 MD |
1326 | if (len < 0 && len != -EAGAIN) { |
1327 | goto end; | |
1328 | } else if (len > 0) { | |
1329 | local_stream[i]->data_read = 1; | |
d41f73b7 | 1330 | } |
3bd1e081 MD |
1331 | } |
1332 | } | |
1333 | ||
4078b776 MD |
1334 | /* |
1335 | * If we read high prio channel in this loop, try again | |
1336 | * for more high prio data. | |
1337 | */ | |
1338 | if (high_prio) { | |
3bd1e081 MD |
1339 | continue; |
1340 | } | |
1341 | ||
1342 | /* Take care of low priority channels. */ | |
4078b776 MD |
1343 | for (i = 0; i < nb_fd; i++) { |
1344 | if ((pollfd[i].revents & POLLIN) || | |
1345 | local_stream[i]->hangup_flush_done) { | |
4078b776 MD |
1346 | DBG("Normal read on fd %d", pollfd[i].fd); |
1347 | len = ctx->on_buffer_ready(local_stream[i], ctx); | |
1348 | /* it's ok to have an unavailable sub-buffer */ | |
1349 | if (len < 0 && len != -EAGAIN) { | |
1350 | goto end; | |
1351 | } else if (len > 0) { | |
1352 | local_stream[i]->data_read = 1; | |
1353 | } | |
1354 | } | |
1355 | } | |
1356 | ||
1357 | /* Handle hangup and errors */ | |
1358 | for (i = 0; i < nb_fd; i++) { | |
1359 | if (!local_stream[i]->hangup_flush_done | |
1360 | && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL)) | |
1361 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
1362 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
1363 | DBG("fd %d is hup|err|nval. Attempting flush and read.", | |
1364 | pollfd[i].fd); | |
1365 | lttng_ustconsumer_on_stream_hangup(local_stream[i]); | |
1366 | /* Attempt read again, for the data we just flushed. */ | |
1367 | local_stream[i]->data_read = 1; | |
1368 | } | |
1369 | /* | |
1370 | * If the poll flag is HUP/ERR/NVAL and we have | |
1371 | * read no data in this pass, we can remove the | |
1372 | * stream from its hash table. | |
1373 | */ | |
1374 | if ((pollfd[i].revents & POLLHUP)) { | |
1375 | DBG("Polling fd %d tells it has hung up.", pollfd[i].fd); | |
1376 | if (!local_stream[i]->data_read) { | |
00e2e675 DG |
1377 | if (local_stream[i]->metadata_flag) { |
1378 | iter.iter.node = &local_stream[i]->waitfd_node.node; | |
1379 | ret = lttng_ht_del(metadata_ht, &iter); | |
1380 | assert(!ret); | |
1381 | } | |
702b1ea4 | 1382 | consumer_del_stream(local_stream[i]); |
4078b776 MD |
1383 | num_hup++; |
1384 | } | |
1385 | } else if (pollfd[i].revents & POLLERR) { | |
1386 | ERR("Error returned in polling fd %d.", pollfd[i].fd); | |
1387 | if (!local_stream[i]->data_read) { | |
00e2e675 DG |
1388 | if (local_stream[i]->metadata_flag) { |
1389 | iter.iter.node = &local_stream[i]->waitfd_node.node; | |
1390 | ret = lttng_ht_del(metadata_ht, &iter); | |
1391 | assert(!ret); | |
1392 | } | |
702b1ea4 | 1393 | consumer_del_stream(local_stream[i]); |
4078b776 MD |
1394 | num_hup++; |
1395 | } | |
1396 | } else if (pollfd[i].revents & POLLNVAL) { | |
1397 | ERR("Polling fd %d tells fd is not open.", pollfd[i].fd); | |
1398 | if (!local_stream[i]->data_read) { | |
00e2e675 DG |
1399 | if (local_stream[i]->metadata_flag) { |
1400 | iter.iter.node = &local_stream[i]->waitfd_node.node; | |
1401 | ret = lttng_ht_del(metadata_ht, &iter); | |
1402 | assert(!ret); | |
1403 | } | |
702b1ea4 | 1404 | consumer_del_stream(local_stream[i]); |
4078b776 | 1405 | num_hup++; |
3bd1e081 MD |
1406 | } |
1407 | } | |
4078b776 | 1408 | local_stream[i]->data_read = 0; |
3bd1e081 MD |
1409 | } |
1410 | } | |
1411 | end: | |
1412 | DBG("polling thread exiting"); | |
1413 | if (pollfd != NULL) { | |
1414 | free(pollfd); | |
1415 | pollfd = NULL; | |
1416 | } | |
1417 | if (local_stream != NULL) { | |
1418 | free(local_stream); | |
1419 | local_stream = NULL; | |
1420 | } | |
e7b994a3 | 1421 | rcu_unregister_thread(); |
3bd1e081 MD |
1422 | return NULL; |
1423 | } | |
1424 | ||
1425 | /* | |
1426 | * This thread listens on the consumerd socket and receives the file | |
1427 | * descriptors from the session daemon. | |
1428 | */ | |
1429 | void *lttng_consumer_thread_receive_fds(void *data) | |
1430 | { | |
1431 | int sock, client_socket, ret; | |
1432 | /* | |
1433 | * structure to poll for incoming data on communication socket avoids | |
1434 | * making blocking sockets. | |
1435 | */ | |
1436 | struct pollfd consumer_sockpoll[2]; | |
1437 | struct lttng_consumer_local_data *ctx = data; | |
1438 | ||
e7b994a3 DG |
1439 | rcu_register_thread(); |
1440 | ||
3bd1e081 MD |
1441 | DBG("Creating command socket %s", ctx->consumer_command_sock_path); |
1442 | unlink(ctx->consumer_command_sock_path); | |
1443 | client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path); | |
1444 | if (client_socket < 0) { | |
1445 | ERR("Cannot create command socket"); | |
1446 | goto end; | |
1447 | } | |
1448 | ||
1449 | ret = lttcomm_listen_unix_sock(client_socket); | |
1450 | if (ret < 0) { | |
1451 | goto end; | |
1452 | } | |
1453 | ||
32258573 | 1454 | DBG("Sending ready command to lttng-sessiond"); |
3bd1e081 MD |
1455 | ret = lttng_consumer_send_error(ctx, CONSUMERD_COMMAND_SOCK_READY); |
1456 | /* return < 0 on error, but == 0 is not fatal */ | |
1457 | if (ret < 0) { | |
32258573 | 1458 | ERR("Error sending ready command to lttng-sessiond"); |
3bd1e081 MD |
1459 | goto end; |
1460 | } | |
1461 | ||
1462 | ret = fcntl(client_socket, F_SETFL, O_NONBLOCK); | |
1463 | if (ret < 0) { | |
1464 | perror("fcntl O_NONBLOCK"); | |
1465 | goto end; | |
1466 | } | |
1467 | ||
1468 | /* prepare the FDs to poll : to client socket and the should_quit pipe */ | |
1469 | consumer_sockpoll[0].fd = ctx->consumer_should_quit[0]; | |
1470 | consumer_sockpoll[0].events = POLLIN | POLLPRI; | |
1471 | consumer_sockpoll[1].fd = client_socket; | |
1472 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
1473 | ||
1474 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
1475 | goto end; | |
1476 | } | |
1477 | DBG("Connection on client_socket"); | |
1478 | ||
1479 | /* Blocking call, waiting for transmission */ | |
1480 | sock = lttcomm_accept_unix_sock(client_socket); | |
1481 | if (sock <= 0) { | |
1482 | WARN("On accept"); | |
1483 | goto end; | |
1484 | } | |
1485 | ret = fcntl(sock, F_SETFL, O_NONBLOCK); | |
1486 | if (ret < 0) { | |
1487 | perror("fcntl O_NONBLOCK"); | |
1488 | goto end; | |
1489 | } | |
1490 | ||
1491 | /* update the polling structure to poll on the established socket */ | |
1492 | consumer_sockpoll[1].fd = sock; | |
1493 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
1494 | ||
1495 | while (1) { | |
1496 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
1497 | goto end; | |
1498 | } | |
1499 | DBG("Incoming command on sock"); | |
1500 | ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
1501 | if (ret == -ENOENT) { | |
1502 | DBG("Received STOP command"); | |
1503 | goto end; | |
1504 | } | |
1505 | if (ret < 0) { | |
1506 | ERR("Communication interrupted on command socket"); | |
1507 | goto end; | |
1508 | } | |
1509 | if (consumer_quit) { | |
1510 | DBG("consumer_thread_receive_fds received quit from signal"); | |
1511 | goto end; | |
1512 | } | |
1513 | DBG("received fds on sock"); | |
1514 | } | |
1515 | end: | |
1516 | DBG("consumer_thread_receive_fds exiting"); | |
1517 | ||
1518 | /* | |
1519 | * when all fds have hung up, the polling thread | |
1520 | * can exit cleanly | |
1521 | */ | |
1522 | consumer_quit = 1; | |
1523 | ||
1524 | /* | |
1525 | * 2s of grace period, if no polling events occur during | |
1526 | * this period, the polling thread will exit even if there | |
1527 | * are still open FDs (should not happen, but safety mechanism). | |
1528 | */ | |
1529 | consumer_poll_timeout = LTTNG_CONSUMER_POLL_TIMEOUT; | |
1530 | ||
04fdd819 MD |
1531 | /* |
1532 | * Wake-up the other end by writing a null byte in the pipe | |
1533 | * (non-blocking). Important note: Because writing into the | |
1534 | * pipe is non-blocking (and therefore we allow dropping wakeup | |
1535 | * data, as long as there is wakeup data present in the pipe | |
1536 | * buffer to wake up the other end), the other end should | |
1537 | * perform the following sequence for waiting: | |
1538 | * 1) empty the pipe (reads). | |
1539 | * 2) perform update operation. | |
1540 | * 3) wait on the pipe (poll). | |
1541 | */ | |
1542 | do { | |
1543 | ret = write(ctx->consumer_poll_pipe[1], "", 1); | |
6f94560a | 1544 | } while (ret < 0 && errno == EINTR); |
e7b994a3 | 1545 | rcu_unregister_thread(); |
3bd1e081 MD |
1546 | return NULL; |
1547 | } | |
d41f73b7 | 1548 | |
4078b776 | 1549 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
1550 | struct lttng_consumer_local_data *ctx) |
1551 | { | |
1552 | switch (consumer_data.type) { | |
1553 | case LTTNG_CONSUMER_KERNEL: | |
1554 | return lttng_kconsumer_read_subbuffer(stream, ctx); | |
7753dea8 MD |
1555 | case LTTNG_CONSUMER32_UST: |
1556 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
1557 | return lttng_ustconsumer_read_subbuffer(stream, ctx); |
1558 | default: | |
1559 | ERR("Unknown consumer_data type"); | |
1560 | assert(0); | |
1561 | return -ENOSYS; | |
1562 | } | |
1563 | } | |
1564 | ||
1565 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
1566 | { | |
1567 | switch (consumer_data.type) { | |
1568 | case LTTNG_CONSUMER_KERNEL: | |
1569 | return lttng_kconsumer_on_recv_stream(stream); | |
7753dea8 MD |
1570 | case LTTNG_CONSUMER32_UST: |
1571 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
1572 | return lttng_ustconsumer_on_recv_stream(stream); |
1573 | default: | |
1574 | ERR("Unknown consumer_data type"); | |
1575 | assert(0); | |
1576 | return -ENOSYS; | |
1577 | } | |
1578 | } | |
e4421fec DG |
1579 | |
1580 | /* | |
1581 | * Allocate and set consumer data hash tables. | |
1582 | */ | |
1583 | void lttng_consumer_init(void) | |
1584 | { | |
1585 | consumer_data.stream_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
1586 | consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
00e2e675 | 1587 | consumer_data.relayd_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
e4421fec | 1588 | } |