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