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 | */ | |
6197aea7 DG |
532 | static int write_relayd_stream_header(struct lttng_consumer_stream *stream, |
533 | size_t data_size, struct consumer_relayd_sock_pair *relayd) | |
00e2e675 DG |
534 | { |
535 | int outfd = -1, ret; | |
00e2e675 DG |
536 | struct lttcomm_relayd_data_hdr data_hdr; |
537 | ||
538 | /* Safety net */ | |
539 | assert(stream); | |
6197aea7 | 540 | assert(relayd); |
00e2e675 DG |
541 | |
542 | /* Reset data header */ | |
543 | memset(&data_hdr, 0, sizeof(data_hdr)); | |
544 | ||
00e2e675 DG |
545 | if (stream->metadata_flag) { |
546 | /* Caller MUST acquire the relayd control socket lock */ | |
547 | ret = relayd_send_metadata(&relayd->control_sock, data_size); | |
548 | if (ret < 0) { | |
549 | goto error; | |
550 | } | |
551 | ||
552 | /* Metadata are always sent on the control socket. */ | |
553 | outfd = relayd->control_sock.fd; | |
554 | } else { | |
555 | /* Set header with stream information */ | |
556 | data_hdr.stream_id = htobe64(stream->relayd_stream_id); | |
557 | data_hdr.data_size = htobe32(data_size); | |
173af62f | 558 | data_hdr.net_seq_num = htobe64(stream->next_net_seq_num++); |
00e2e675 DG |
559 | /* Other fields are zeroed previously */ |
560 | ||
561 | ret = relayd_send_data_hdr(&relayd->data_sock, &data_hdr, | |
562 | sizeof(data_hdr)); | |
563 | if (ret < 0) { | |
564 | goto error; | |
565 | } | |
566 | ||
567 | /* Set to go on data socket */ | |
568 | outfd = relayd->data_sock.fd; | |
569 | } | |
570 | ||
571 | error: | |
572 | return outfd; | |
573 | } | |
574 | ||
3bd1e081 MD |
575 | /* |
576 | * Update a stream according to what we just received. | |
577 | */ | |
578 | void consumer_change_stream_state(int stream_key, | |
579 | enum lttng_consumer_stream_state state) | |
580 | { | |
581 | struct lttng_consumer_stream *stream; | |
582 | ||
583 | pthread_mutex_lock(&consumer_data.lock); | |
584 | stream = consumer_find_stream(stream_key); | |
585 | if (stream) { | |
586 | stream->state = state; | |
587 | } | |
588 | consumer_data.need_update = 1; | |
589 | pthread_mutex_unlock(&consumer_data.lock); | |
590 | } | |
591 | ||
702b1ea4 MD |
592 | static |
593 | void consumer_free_channel(struct rcu_head *head) | |
594 | { | |
595 | struct lttng_ht_node_ulong *node = | |
596 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
597 | struct lttng_consumer_channel *channel = | |
598 | caa_container_of(node, struct lttng_consumer_channel, node); | |
599 | ||
600 | free(channel); | |
601 | } | |
602 | ||
3bd1e081 MD |
603 | /* |
604 | * Remove a channel from the global list protected by a mutex. This | |
605 | * function is also responsible for freeing its data structures. | |
606 | */ | |
607 | void consumer_del_channel(struct lttng_consumer_channel *channel) | |
608 | { | |
609 | int ret; | |
e4421fec | 610 | struct lttng_ht_iter iter; |
3bd1e081 MD |
611 | |
612 | pthread_mutex_lock(&consumer_data.lock); | |
613 | ||
614 | switch (consumer_data.type) { | |
615 | case LTTNG_CONSUMER_KERNEL: | |
616 | break; | |
7753dea8 MD |
617 | case LTTNG_CONSUMER32_UST: |
618 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
619 | lttng_ustconsumer_del_channel(channel); |
620 | break; | |
621 | default: | |
622 | ERR("Unknown consumer_data type"); | |
623 | assert(0); | |
624 | goto end; | |
625 | } | |
626 | ||
6065ceec | 627 | rcu_read_lock(); |
04253271 MD |
628 | iter.iter.node = &channel->node.node; |
629 | ret = lttng_ht_del(consumer_data.channel_ht, &iter); | |
630 | assert(!ret); | |
6065ceec DG |
631 | rcu_read_unlock(); |
632 | ||
3bd1e081 MD |
633 | if (channel->mmap_base != NULL) { |
634 | ret = munmap(channel->mmap_base, channel->mmap_len); | |
635 | if (ret != 0) { | |
636 | perror("munmap"); | |
637 | } | |
638 | } | |
b5c5fc29 | 639 | if (channel->wait_fd >= 0 && !channel->wait_fd_is_copy) { |
4c462e79 MD |
640 | ret = close(channel->wait_fd); |
641 | if (ret) { | |
642 | PERROR("close"); | |
643 | } | |
3bd1e081 | 644 | } |
2c1dd183 | 645 | if (channel->shm_fd >= 0 && channel->wait_fd != channel->shm_fd) { |
4c462e79 MD |
646 | ret = close(channel->shm_fd); |
647 | if (ret) { | |
648 | PERROR("close"); | |
649 | } | |
3bd1e081 | 650 | } |
702b1ea4 MD |
651 | |
652 | call_rcu(&channel->node.head, consumer_free_channel); | |
3bd1e081 MD |
653 | end: |
654 | pthread_mutex_unlock(&consumer_data.lock); | |
655 | } | |
656 | ||
657 | struct lttng_consumer_channel *consumer_allocate_channel( | |
658 | int channel_key, | |
659 | int shm_fd, int wait_fd, | |
660 | uint64_t mmap_len, | |
661 | uint64_t max_sb_size) | |
662 | { | |
663 | struct lttng_consumer_channel *channel; | |
664 | int ret; | |
665 | ||
276b26d1 | 666 | channel = zmalloc(sizeof(*channel)); |
3bd1e081 MD |
667 | if (channel == NULL) { |
668 | perror("malloc struct lttng_consumer_channel"); | |
669 | goto end; | |
670 | } | |
671 | channel->key = channel_key; | |
672 | channel->shm_fd = shm_fd; | |
673 | channel->wait_fd = wait_fd; | |
674 | channel->mmap_len = mmap_len; | |
675 | channel->max_sb_size = max_sb_size; | |
676 | channel->refcount = 0; | |
677 | channel->nr_streams = 0; | |
e4421fec | 678 | lttng_ht_node_init_ulong(&channel->node, channel->key); |
3bd1e081 MD |
679 | |
680 | switch (consumer_data.type) { | |
681 | case LTTNG_CONSUMER_KERNEL: | |
682 | channel->mmap_base = NULL; | |
683 | channel->mmap_len = 0; | |
684 | break; | |
7753dea8 MD |
685 | case LTTNG_CONSUMER32_UST: |
686 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
687 | ret = lttng_ustconsumer_allocate_channel(channel); |
688 | if (ret) { | |
689 | free(channel); | |
690 | return NULL; | |
691 | } | |
692 | break; | |
693 | default: | |
694 | ERR("Unknown consumer_data type"); | |
695 | assert(0); | |
696 | goto end; | |
697 | } | |
698 | DBG("Allocated channel (key %d, shm_fd %d, wait_fd %d, mmap_len %llu, max_sb_size %llu)", | |
00e2e675 | 699 | channel->key, channel->shm_fd, channel->wait_fd, |
3bd1e081 MD |
700 | (unsigned long long) channel->mmap_len, |
701 | (unsigned long long) channel->max_sb_size); | |
702 | end: | |
703 | return channel; | |
704 | } | |
705 | ||
706 | /* | |
707 | * Add a channel to the global list protected by a mutex. | |
708 | */ | |
709 | int consumer_add_channel(struct lttng_consumer_channel *channel) | |
710 | { | |
c77fc10a DG |
711 | struct lttng_ht_node_ulong *node; |
712 | struct lttng_ht_iter iter; | |
713 | ||
3bd1e081 | 714 | pthread_mutex_lock(&consumer_data.lock); |
7ad0a0cb MD |
715 | /* Steal channel identifier, for UST */ |
716 | consumer_steal_channel_key(channel->key); | |
6065ceec | 717 | rcu_read_lock(); |
c77fc10a DG |
718 | |
719 | lttng_ht_lookup(consumer_data.channel_ht, | |
720 | (void *)((unsigned long) channel->key), &iter); | |
721 | node = lttng_ht_iter_get_node_ulong(&iter); | |
722 | if (node != NULL) { | |
723 | /* Channel already exist. Ignore the insertion */ | |
724 | goto end; | |
725 | } | |
726 | ||
04253271 | 727 | lttng_ht_add_unique_ulong(consumer_data.channel_ht, &channel->node); |
c77fc10a DG |
728 | |
729 | end: | |
6065ceec | 730 | rcu_read_unlock(); |
3bd1e081 | 731 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 732 | |
7ad0a0cb | 733 | return 0; |
3bd1e081 MD |
734 | } |
735 | ||
736 | /* | |
737 | * Allocate the pollfd structure and the local view of the out fds to avoid | |
738 | * doing a lookup in the linked list and concurrency issues when writing is | |
739 | * needed. Called with consumer_data.lock held. | |
740 | * | |
741 | * Returns the number of fds in the structures. | |
742 | */ | |
743 | int consumer_update_poll_array( | |
744 | struct lttng_consumer_local_data *ctx, struct pollfd **pollfd, | |
00e2e675 DG |
745 | struct lttng_consumer_stream **local_stream, |
746 | struct lttng_ht *metadata_ht) | |
3bd1e081 | 747 | { |
3bd1e081 | 748 | int i = 0; |
e4421fec DG |
749 | struct lttng_ht_iter iter; |
750 | struct lttng_consumer_stream *stream; | |
3bd1e081 MD |
751 | |
752 | DBG("Updating poll fd array"); | |
481d6c57 | 753 | rcu_read_lock(); |
e4421fec DG |
754 | cds_lfht_for_each_entry(consumer_data.stream_ht->ht, &iter.iter, stream, |
755 | node.node) { | |
756 | if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM) { | |
3bd1e081 MD |
757 | continue; |
758 | } | |
e4421fec DG |
759 | DBG("Active FD %d", stream->wait_fd); |
760 | (*pollfd)[i].fd = stream->wait_fd; | |
3bd1e081 | 761 | (*pollfd)[i].events = POLLIN | POLLPRI; |
00e2e675 DG |
762 | if (stream->metadata_flag && metadata_ht) { |
763 | lttng_ht_add_unique_ulong(metadata_ht, &stream->waitfd_node); | |
764 | DBG("Active FD added to metadata hash table"); | |
765 | } | |
e4421fec | 766 | local_stream[i] = stream; |
3bd1e081 MD |
767 | i++; |
768 | } | |
481d6c57 | 769 | rcu_read_unlock(); |
3bd1e081 MD |
770 | |
771 | /* | |
772 | * Insert the consumer_poll_pipe at the end of the array and don't | |
773 | * increment i so nb_fd is the number of real FD. | |
774 | */ | |
775 | (*pollfd)[i].fd = ctx->consumer_poll_pipe[0]; | |
509bb1cf | 776 | (*pollfd)[i].events = POLLIN | POLLPRI; |
3bd1e081 MD |
777 | return i; |
778 | } | |
779 | ||
780 | /* | |
781 | * Poll on the should_quit pipe and the command socket return -1 on error and | |
782 | * should exit, 0 if data is available on the command socket | |
783 | */ | |
784 | int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll) | |
785 | { | |
786 | int num_rdy; | |
787 | ||
88f2b785 | 788 | restart: |
3bd1e081 MD |
789 | num_rdy = poll(consumer_sockpoll, 2, -1); |
790 | if (num_rdy == -1) { | |
88f2b785 MD |
791 | /* |
792 | * Restart interrupted system call. | |
793 | */ | |
794 | if (errno == EINTR) { | |
795 | goto restart; | |
796 | } | |
3bd1e081 MD |
797 | perror("Poll error"); |
798 | goto exit; | |
799 | } | |
509bb1cf | 800 | if (consumer_sockpoll[0].revents & (POLLIN | POLLPRI)) { |
3bd1e081 MD |
801 | DBG("consumer_should_quit wake up"); |
802 | goto exit; | |
803 | } | |
804 | return 0; | |
805 | ||
806 | exit: | |
807 | return -1; | |
808 | } | |
809 | ||
810 | /* | |
811 | * Set the error socket. | |
812 | */ | |
813 | void lttng_consumer_set_error_sock( | |
814 | struct lttng_consumer_local_data *ctx, int sock) | |
815 | { | |
816 | ctx->consumer_error_socket = sock; | |
817 | } | |
818 | ||
819 | /* | |
820 | * Set the command socket path. | |
821 | */ | |
3bd1e081 MD |
822 | void lttng_consumer_set_command_sock_path( |
823 | struct lttng_consumer_local_data *ctx, char *sock) | |
824 | { | |
825 | ctx->consumer_command_sock_path = sock; | |
826 | } | |
827 | ||
828 | /* | |
829 | * Send return code to the session daemon. | |
830 | * If the socket is not defined, we return 0, it is not a fatal error | |
831 | */ | |
832 | int lttng_consumer_send_error( | |
833 | struct lttng_consumer_local_data *ctx, int cmd) | |
834 | { | |
835 | if (ctx->consumer_error_socket > 0) { | |
836 | return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd, | |
837 | sizeof(enum lttcomm_sessiond_command)); | |
838 | } | |
839 | ||
840 | return 0; | |
841 | } | |
842 | ||
843 | /* | |
844 | * Close all the tracefiles and stream fds, should be called when all instances | |
845 | * are destroyed. | |
846 | */ | |
847 | void lttng_consumer_cleanup(void) | |
848 | { | |
e4421fec | 849 | struct lttng_ht_iter iter; |
6065ceec DG |
850 | struct lttng_ht_node_ulong *node; |
851 | ||
852 | rcu_read_lock(); | |
3bd1e081 MD |
853 | |
854 | /* | |
6065ceec DG |
855 | * close all outfd. Called when there are no more threads running (after |
856 | * joining on the threads), no need to protect list iteration with mutex. | |
3bd1e081 | 857 | */ |
6065ceec DG |
858 | cds_lfht_for_each_entry(consumer_data.stream_ht->ht, &iter.iter, node, |
859 | node) { | |
702b1ea4 MD |
860 | struct lttng_consumer_stream *stream = |
861 | caa_container_of(node, struct lttng_consumer_stream, node); | |
862 | consumer_del_stream(stream); | |
3bd1e081 | 863 | } |
e4421fec | 864 | |
6065ceec DG |
865 | cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, node, |
866 | node) { | |
702b1ea4 MD |
867 | struct lttng_consumer_channel *channel = |
868 | caa_container_of(node, struct lttng_consumer_channel, node); | |
869 | consumer_del_channel(channel); | |
3bd1e081 | 870 | } |
6065ceec DG |
871 | |
872 | rcu_read_unlock(); | |
d6ce1df2 MD |
873 | |
874 | lttng_ht_destroy(consumer_data.stream_ht); | |
875 | lttng_ht_destroy(consumer_data.channel_ht); | |
3bd1e081 MD |
876 | } |
877 | ||
878 | /* | |
879 | * Called from signal handler. | |
880 | */ | |
881 | void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx) | |
882 | { | |
883 | int ret; | |
884 | consumer_quit = 1; | |
6f94560a MD |
885 | do { |
886 | ret = write(ctx->consumer_should_quit[1], "4", 1); | |
887 | } while (ret < 0 && errno == EINTR); | |
3bd1e081 MD |
888 | if (ret < 0) { |
889 | perror("write consumer quit"); | |
890 | } | |
891 | } | |
892 | ||
00e2e675 DG |
893 | void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream, |
894 | off_t orig_offset) | |
3bd1e081 MD |
895 | { |
896 | int outfd = stream->out_fd; | |
897 | ||
898 | /* | |
899 | * This does a blocking write-and-wait on any page that belongs to the | |
900 | * subbuffer prior to the one we just wrote. | |
901 | * Don't care about error values, as these are just hints and ways to | |
902 | * limit the amount of page cache used. | |
903 | */ | |
904 | if (orig_offset < stream->chan->max_sb_size) { | |
905 | return; | |
906 | } | |
b9182dd9 | 907 | lttng_sync_file_range(outfd, orig_offset - stream->chan->max_sb_size, |
3bd1e081 MD |
908 | stream->chan->max_sb_size, |
909 | SYNC_FILE_RANGE_WAIT_BEFORE | |
910 | | SYNC_FILE_RANGE_WRITE | |
911 | | SYNC_FILE_RANGE_WAIT_AFTER); | |
912 | /* | |
913 | * Give hints to the kernel about how we access the file: | |
914 | * POSIX_FADV_DONTNEED : we won't re-access data in a near future after | |
915 | * we write it. | |
916 | * | |
917 | * We need to call fadvise again after the file grows because the | |
918 | * kernel does not seem to apply fadvise to non-existing parts of the | |
919 | * file. | |
920 | * | |
921 | * Call fadvise _after_ having waited for the page writeback to | |
922 | * complete because the dirty page writeback semantic is not well | |
923 | * defined. So it can be expected to lead to lower throughput in | |
924 | * streaming. | |
925 | */ | |
926 | posix_fadvise(outfd, orig_offset - stream->chan->max_sb_size, | |
927 | stream->chan->max_sb_size, POSIX_FADV_DONTNEED); | |
928 | } | |
929 | ||
930 | /* | |
931 | * Initialise the necessary environnement : | |
932 | * - create a new context | |
933 | * - create the poll_pipe | |
934 | * - create the should_quit pipe (for signal handler) | |
935 | * - create the thread pipe (for splice) | |
936 | * | |
937 | * Takes a function pointer as argument, this function is called when data is | |
938 | * available on a buffer. This function is responsible to do the | |
939 | * kernctl_get_next_subbuf, read the data with mmap or splice depending on the | |
940 | * buffer configuration and then kernctl_put_next_subbuf at the end. | |
941 | * | |
942 | * Returns a pointer to the new context or NULL on error. | |
943 | */ | |
944 | struct lttng_consumer_local_data *lttng_consumer_create( | |
945 | enum lttng_consumer_type type, | |
4078b776 | 946 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
d41f73b7 | 947 | struct lttng_consumer_local_data *ctx), |
3bd1e081 MD |
948 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
949 | int (*recv_stream)(struct lttng_consumer_stream *stream), | |
950 | int (*update_stream)(int stream_key, uint32_t state)) | |
951 | { | |
952 | int ret, i; | |
953 | struct lttng_consumer_local_data *ctx; | |
954 | ||
955 | assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN || | |
956 | consumer_data.type == type); | |
957 | consumer_data.type = type; | |
958 | ||
effcf122 | 959 | ctx = zmalloc(sizeof(struct lttng_consumer_local_data)); |
3bd1e081 MD |
960 | if (ctx == NULL) { |
961 | perror("allocating context"); | |
962 | goto error; | |
963 | } | |
964 | ||
965 | ctx->consumer_error_socket = -1; | |
966 | /* assign the callbacks */ | |
967 | ctx->on_buffer_ready = buffer_ready; | |
968 | ctx->on_recv_channel = recv_channel; | |
969 | ctx->on_recv_stream = recv_stream; | |
970 | ctx->on_update_stream = update_stream; | |
971 | ||
972 | ret = pipe(ctx->consumer_poll_pipe); | |
973 | if (ret < 0) { | |
974 | perror("Error creating poll pipe"); | |
975 | goto error_poll_pipe; | |
976 | } | |
977 | ||
04fdd819 MD |
978 | /* set read end of the pipe to non-blocking */ |
979 | ret = fcntl(ctx->consumer_poll_pipe[0], F_SETFL, O_NONBLOCK); | |
980 | if (ret < 0) { | |
981 | perror("fcntl O_NONBLOCK"); | |
982 | goto error_poll_fcntl; | |
983 | } | |
984 | ||
985 | /* set write end of the pipe to non-blocking */ | |
986 | ret = fcntl(ctx->consumer_poll_pipe[1], F_SETFL, O_NONBLOCK); | |
987 | if (ret < 0) { | |
988 | perror("fcntl O_NONBLOCK"); | |
989 | goto error_poll_fcntl; | |
990 | } | |
991 | ||
3bd1e081 MD |
992 | ret = pipe(ctx->consumer_should_quit); |
993 | if (ret < 0) { | |
994 | perror("Error creating recv pipe"); | |
995 | goto error_quit_pipe; | |
996 | } | |
997 | ||
998 | ret = pipe(ctx->consumer_thread_pipe); | |
999 | if (ret < 0) { | |
1000 | perror("Error creating thread pipe"); | |
1001 | goto error_thread_pipe; | |
1002 | } | |
1003 | ||
1004 | return ctx; | |
1005 | ||
1006 | ||
1007 | error_thread_pipe: | |
1008 | for (i = 0; i < 2; i++) { | |
1009 | int err; | |
1010 | ||
1011 | err = close(ctx->consumer_should_quit[i]); | |
4c462e79 MD |
1012 | if (err) { |
1013 | PERROR("close"); | |
1014 | } | |
3bd1e081 | 1015 | } |
04fdd819 | 1016 | error_poll_fcntl: |
3bd1e081 MD |
1017 | error_quit_pipe: |
1018 | for (i = 0; i < 2; i++) { | |
1019 | int err; | |
1020 | ||
1021 | err = close(ctx->consumer_poll_pipe[i]); | |
4c462e79 MD |
1022 | if (err) { |
1023 | PERROR("close"); | |
1024 | } | |
3bd1e081 MD |
1025 | } |
1026 | error_poll_pipe: | |
1027 | free(ctx); | |
1028 | error: | |
1029 | return NULL; | |
1030 | } | |
1031 | ||
1032 | /* | |
1033 | * Close all fds associated with the instance and free the context. | |
1034 | */ | |
1035 | void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx) | |
1036 | { | |
4c462e79 MD |
1037 | int ret; |
1038 | ||
1039 | ret = close(ctx->consumer_error_socket); | |
1040 | if (ret) { | |
1041 | PERROR("close"); | |
1042 | } | |
1043 | ret = close(ctx->consumer_thread_pipe[0]); | |
1044 | if (ret) { | |
1045 | PERROR("close"); | |
1046 | } | |
1047 | ret = close(ctx->consumer_thread_pipe[1]); | |
1048 | if (ret) { | |
1049 | PERROR("close"); | |
1050 | } | |
1051 | ret = close(ctx->consumer_poll_pipe[0]); | |
1052 | if (ret) { | |
1053 | PERROR("close"); | |
1054 | } | |
1055 | ret = close(ctx->consumer_poll_pipe[1]); | |
1056 | if (ret) { | |
1057 | PERROR("close"); | |
1058 | } | |
1059 | ret = close(ctx->consumer_should_quit[0]); | |
1060 | if (ret) { | |
1061 | PERROR("close"); | |
1062 | } | |
1063 | ret = close(ctx->consumer_should_quit[1]); | |
1064 | if (ret) { | |
1065 | PERROR("close"); | |
1066 | } | |
3bd1e081 MD |
1067 | unlink(ctx->consumer_command_sock_path); |
1068 | free(ctx); | |
1069 | } | |
1070 | ||
6197aea7 DG |
1071 | /* |
1072 | * Write the metadata stream id on the specified file descriptor. | |
1073 | */ | |
1074 | static int write_relayd_metadata_id(int fd, | |
1075 | struct lttng_consumer_stream *stream, | |
1076 | struct consumer_relayd_sock_pair *relayd) | |
1077 | { | |
1078 | int ret; | |
1079 | uint64_t metadata_id; | |
1080 | ||
1081 | metadata_id = htobe64(stream->relayd_stream_id); | |
1082 | do { | |
1083 | ret = write(fd, (void *) &metadata_id, | |
1084 | sizeof(stream->relayd_stream_id)); | |
1085 | } while (ret < 0 && errno == EINTR); | |
1086 | if (ret < 0) { | |
1087 | PERROR("write metadata stream id"); | |
1088 | goto end; | |
1089 | } | |
1090 | DBG("Metadata stream id %zu written before data", | |
1091 | stream->relayd_stream_id); | |
1092 | ||
1093 | end: | |
1094 | return ret; | |
1095 | } | |
1096 | ||
3bd1e081 MD |
1097 | /* |
1098 | * Mmap the ring buffer, read it and write the data to the tracefile. | |
1099 | * | |
1100 | * Returns the number of bytes written | |
1101 | */ | |
4078b776 | 1102 | ssize_t lttng_consumer_on_read_subbuffer_mmap( |
3bd1e081 MD |
1103 | struct lttng_consumer_local_data *ctx, |
1104 | struct lttng_consumer_stream *stream, unsigned long len) | |
1105 | { | |
f02e1e8a DG |
1106 | unsigned long mmap_offset; |
1107 | ssize_t ret = 0, written = 0; | |
1108 | off_t orig_offset = stream->out_fd_offset; | |
1109 | /* Default is on the disk */ | |
1110 | int outfd = stream->out_fd; | |
f02e1e8a DG |
1111 | struct consumer_relayd_sock_pair *relayd = NULL; |
1112 | ||
1113 | /* RCU lock for the relayd pointer */ | |
1114 | rcu_read_lock(); | |
1115 | ||
1116 | /* Flag that the current stream if set for network streaming. */ | |
1117 | if (stream->net_seq_idx != -1) { | |
1118 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1119 | if (relayd == NULL) { | |
1120 | goto end; | |
1121 | } | |
1122 | } | |
1123 | ||
1124 | /* get the offset inside the fd to mmap */ | |
3bd1e081 MD |
1125 | switch (consumer_data.type) { |
1126 | case LTTNG_CONSUMER_KERNEL: | |
f02e1e8a DG |
1127 | ret = kernctl_get_mmap_read_offset(stream->wait_fd, &mmap_offset); |
1128 | break; | |
7753dea8 MD |
1129 | case LTTNG_CONSUMER32_UST: |
1130 | case LTTNG_CONSUMER64_UST: | |
f02e1e8a DG |
1131 | ret = lttng_ustctl_get_mmap_read_offset(stream->chan->handle, |
1132 | stream->buf, &mmap_offset); | |
1133 | break; | |
3bd1e081 MD |
1134 | default: |
1135 | ERR("Unknown consumer_data type"); | |
1136 | assert(0); | |
1137 | } | |
f02e1e8a DG |
1138 | if (ret != 0) { |
1139 | errno = -ret; | |
1140 | PERROR("tracer ctl get_mmap_read_offset"); | |
1141 | written = ret; | |
1142 | goto end; | |
1143 | } | |
b9182dd9 | 1144 | |
f02e1e8a DG |
1145 | /* Handle stream on the relayd if the output is on the network */ |
1146 | if (relayd) { | |
1147 | unsigned long netlen = len; | |
1148 | ||
1149 | /* | |
1150 | * Lock the control socket for the complete duration of the function | |
1151 | * since from this point on we will use the socket. | |
1152 | */ | |
1153 | if (stream->metadata_flag) { | |
1154 | /* Metadata requires the control socket. */ | |
1155 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1156 | netlen += sizeof(stream->relayd_stream_id); | |
1157 | } | |
1158 | ||
6197aea7 | 1159 | ret = write_relayd_stream_header(stream, netlen, relayd); |
f02e1e8a DG |
1160 | if (ret >= 0) { |
1161 | /* Use the returned socket. */ | |
1162 | outfd = ret; | |
1163 | ||
1164 | /* Write metadata stream id before payload */ | |
1165 | if (stream->metadata_flag) { | |
6197aea7 | 1166 | ret = write_relayd_metadata_id(outfd, stream, relayd); |
f02e1e8a | 1167 | if (ret < 0) { |
f02e1e8a DG |
1168 | written = ret; |
1169 | goto end; | |
1170 | } | |
6197aea7 | 1171 | |
f02e1e8a DG |
1172 | /* |
1173 | * We do this so the return value can match the len passed as | |
1174 | * argument to this function. | |
1175 | */ | |
1176 | written -= sizeof(stream->relayd_stream_id); | |
1177 | } | |
1178 | } | |
1179 | /* Else, use the default set before which is the filesystem. */ | |
1180 | } | |
1181 | ||
1182 | while (len > 0) { | |
1183 | do { | |
1184 | ret = write(outfd, stream->mmap_base + mmap_offset, len); | |
1185 | } while (ret < 0 && errno == EINTR); | |
1186 | if (ret < 0) { | |
1187 | PERROR("Error in file write"); | |
1188 | if (written == 0) { | |
1189 | written = ret; | |
1190 | } | |
1191 | goto end; | |
1192 | } else if (ret > len) { | |
1193 | PERROR("Error in file write (ret %ld > len %lu)", ret, len); | |
1194 | written += ret; | |
1195 | goto end; | |
1196 | } else { | |
1197 | len -= ret; | |
1198 | mmap_offset += ret; | |
1199 | } | |
1200 | DBG("Consumer mmap write() ret %ld (len %lu)", ret, len); | |
1201 | ||
1202 | /* This call is useless on a socket so better save a syscall. */ | |
1203 | if (!relayd) { | |
1204 | /* This won't block, but will start writeout asynchronously */ | |
1205 | lttng_sync_file_range(outfd, stream->out_fd_offset, ret, | |
1206 | SYNC_FILE_RANGE_WRITE); | |
1207 | stream->out_fd_offset += ret; | |
1208 | } | |
1209 | written += ret; | |
1210 | } | |
1211 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
1212 | ||
1213 | end: | |
1214 | /* Unlock only if ctrl socket used */ | |
1215 | if (relayd && stream->metadata_flag) { | |
1216 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1217 | } | |
1218 | ||
1219 | rcu_read_unlock(); | |
1220 | return written; | |
3bd1e081 MD |
1221 | } |
1222 | ||
1223 | /* | |
1224 | * Splice the data from the ring buffer to the tracefile. | |
1225 | * | |
1226 | * Returns the number of bytes spliced. | |
1227 | */ | |
4078b776 | 1228 | ssize_t lttng_consumer_on_read_subbuffer_splice( |
3bd1e081 MD |
1229 | struct lttng_consumer_local_data *ctx, |
1230 | struct lttng_consumer_stream *stream, unsigned long len) | |
1231 | { | |
f02e1e8a DG |
1232 | ssize_t ret = 0, written = 0, ret_splice = 0; |
1233 | loff_t offset = 0; | |
1234 | off_t orig_offset = stream->out_fd_offset; | |
1235 | int fd = stream->wait_fd; | |
1236 | /* Default is on the disk */ | |
1237 | int outfd = stream->out_fd; | |
f02e1e8a DG |
1238 | struct consumer_relayd_sock_pair *relayd = NULL; |
1239 | ||
3bd1e081 MD |
1240 | switch (consumer_data.type) { |
1241 | case LTTNG_CONSUMER_KERNEL: | |
f02e1e8a | 1242 | break; |
7753dea8 MD |
1243 | case LTTNG_CONSUMER32_UST: |
1244 | case LTTNG_CONSUMER64_UST: | |
f02e1e8a | 1245 | /* Not supported for user space tracing */ |
3bd1e081 MD |
1246 | return -ENOSYS; |
1247 | default: | |
1248 | ERR("Unknown consumer_data type"); | |
1249 | assert(0); | |
3bd1e081 MD |
1250 | } |
1251 | ||
f02e1e8a DG |
1252 | /* RCU lock for the relayd pointer */ |
1253 | rcu_read_lock(); | |
1254 | ||
1255 | /* Flag that the current stream if set for network streaming. */ | |
1256 | if (stream->net_seq_idx != -1) { | |
1257 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1258 | if (relayd == NULL) { | |
1259 | goto end; | |
1260 | } | |
1261 | } | |
1262 | ||
1263 | /* Write metadata stream id before payload */ | |
1264 | if (stream->metadata_flag && relayd) { | |
1265 | /* | |
1266 | * Lock the control socket for the complete duration of the function | |
1267 | * since from this point on we will use the socket. | |
1268 | */ | |
1269 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1270 | ||
6197aea7 DG |
1271 | ret = write_relayd_metadata_id(ctx->consumer_thread_pipe[1], |
1272 | stream, relayd); | |
f02e1e8a | 1273 | if (ret < 0) { |
f02e1e8a DG |
1274 | written = ret; |
1275 | goto end; | |
1276 | } | |
f02e1e8a DG |
1277 | } |
1278 | ||
1279 | while (len > 0) { | |
1280 | DBG("splice chan to pipe offset %lu of len %lu (fd : %d)", | |
1281 | (unsigned long)offset, len, fd); | |
1282 | ret_splice = splice(fd, &offset, ctx->consumer_thread_pipe[1], NULL, len, | |
1283 | SPLICE_F_MOVE | SPLICE_F_MORE); | |
1284 | DBG("splice chan to pipe, ret %zd", ret_splice); | |
1285 | if (ret_splice < 0) { | |
1286 | PERROR("Error in relay splice"); | |
1287 | if (written == 0) { | |
1288 | written = ret_splice; | |
1289 | } | |
1290 | ret = errno; | |
1291 | goto splice_error; | |
1292 | } | |
1293 | ||
1294 | /* Handle stream on the relayd if the output is on the network */ | |
1295 | if (relayd) { | |
1296 | if (stream->metadata_flag) { | |
1297 | /* Update counter to fit the spliced data */ | |
1298 | ret_splice += sizeof(stream->relayd_stream_id); | |
1299 | len += sizeof(stream->relayd_stream_id); | |
1300 | /* | |
1301 | * We do this so the return value can match the len passed as | |
1302 | * argument to this function. | |
1303 | */ | |
1304 | written -= sizeof(stream->relayd_stream_id); | |
1305 | } | |
1306 | ||
6197aea7 | 1307 | ret = write_relayd_stream_header(stream, ret_splice, relayd); |
f02e1e8a DG |
1308 | if (ret >= 0) { |
1309 | /* Use the returned socket. */ | |
1310 | outfd = ret; | |
1311 | } else { | |
6197aea7 DG |
1312 | ERR("Remote relayd disconnected. Stopping"); |
1313 | goto end; | |
f02e1e8a DG |
1314 | } |
1315 | } | |
1316 | ||
1317 | /* Splice data out */ | |
1318 | ret_splice = splice(ctx->consumer_thread_pipe[0], NULL, outfd, NULL, | |
1319 | ret_splice, SPLICE_F_MOVE | SPLICE_F_MORE); | |
1320 | DBG("Kernel consumer splice pipe to file, ret %zd", ret_splice); | |
1321 | if (ret_splice < 0) { | |
1322 | PERROR("Error in file splice"); | |
1323 | if (written == 0) { | |
1324 | written = ret_splice; | |
1325 | } | |
1326 | ret = errno; | |
1327 | goto splice_error; | |
1328 | } else if (ret_splice > len) { | |
1329 | errno = EINVAL; | |
1330 | PERROR("Wrote more data than requested %zd (len: %lu)", | |
1331 | ret_splice, len); | |
1332 | written += ret_splice; | |
1333 | ret = errno; | |
1334 | goto splice_error; | |
1335 | } | |
1336 | len -= ret_splice; | |
1337 | ||
1338 | /* This call is useless on a socket so better save a syscall. */ | |
1339 | if (!relayd) { | |
1340 | /* This won't block, but will start writeout asynchronously */ | |
1341 | lttng_sync_file_range(outfd, stream->out_fd_offset, ret_splice, | |
1342 | SYNC_FILE_RANGE_WRITE); | |
1343 | stream->out_fd_offset += ret_splice; | |
1344 | } | |
1345 | written += ret_splice; | |
1346 | } | |
1347 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
1348 | ||
1349 | ret = ret_splice; | |
1350 | ||
1351 | goto end; | |
1352 | ||
1353 | splice_error: | |
1354 | /* send the appropriate error description to sessiond */ | |
1355 | switch (ret) { | |
1356 | case EBADF: | |
1357 | lttng_consumer_send_error(ctx, CONSUMERD_SPLICE_EBADF); | |
1358 | break; | |
1359 | case EINVAL: | |
1360 | lttng_consumer_send_error(ctx, CONSUMERD_SPLICE_EINVAL); | |
1361 | break; | |
1362 | case ENOMEM: | |
1363 | lttng_consumer_send_error(ctx, CONSUMERD_SPLICE_ENOMEM); | |
1364 | break; | |
1365 | case ESPIPE: | |
1366 | lttng_consumer_send_error(ctx, CONSUMERD_SPLICE_ESPIPE); | |
1367 | break; | |
1368 | } | |
1369 | ||
1370 | end: | |
1371 | if (relayd && stream->metadata_flag) { | |
1372 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1373 | } | |
1374 | ||
1375 | rcu_read_unlock(); | |
1376 | return written; | |
3bd1e081 MD |
1377 | } |
1378 | ||
1379 | /* | |
1380 | * Take a snapshot for a specific fd | |
1381 | * | |
1382 | * Returns 0 on success, < 0 on error | |
1383 | */ | |
1384 | int lttng_consumer_take_snapshot(struct lttng_consumer_local_data *ctx, | |
1385 | struct lttng_consumer_stream *stream) | |
1386 | { | |
1387 | switch (consumer_data.type) { | |
1388 | case LTTNG_CONSUMER_KERNEL: | |
1389 | return lttng_kconsumer_take_snapshot(ctx, stream); | |
7753dea8 MD |
1390 | case LTTNG_CONSUMER32_UST: |
1391 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1392 | return lttng_ustconsumer_take_snapshot(ctx, stream); |
1393 | default: | |
1394 | ERR("Unknown consumer_data type"); | |
1395 | assert(0); | |
1396 | return -ENOSYS; | |
1397 | } | |
1398 | ||
1399 | } | |
1400 | ||
1401 | /* | |
1402 | * Get the produced position | |
1403 | * | |
1404 | * Returns 0 on success, < 0 on error | |
1405 | */ | |
1406 | int lttng_consumer_get_produced_snapshot( | |
1407 | struct lttng_consumer_local_data *ctx, | |
1408 | struct lttng_consumer_stream *stream, | |
1409 | unsigned long *pos) | |
1410 | { | |
1411 | switch (consumer_data.type) { | |
1412 | case LTTNG_CONSUMER_KERNEL: | |
1413 | return lttng_kconsumer_get_produced_snapshot(ctx, stream, pos); | |
7753dea8 MD |
1414 | case LTTNG_CONSUMER32_UST: |
1415 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1416 | return lttng_ustconsumer_get_produced_snapshot(ctx, stream, pos); |
1417 | default: | |
1418 | ERR("Unknown consumer_data type"); | |
1419 | assert(0); | |
1420 | return -ENOSYS; | |
1421 | } | |
1422 | } | |
1423 | ||
1424 | int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, | |
1425 | int sock, struct pollfd *consumer_sockpoll) | |
1426 | { | |
1427 | switch (consumer_data.type) { | |
1428 | case LTTNG_CONSUMER_KERNEL: | |
1429 | return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
7753dea8 MD |
1430 | case LTTNG_CONSUMER32_UST: |
1431 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1432 | return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll); |
1433 | default: | |
1434 | ERR("Unknown consumer_data type"); | |
1435 | assert(0); | |
1436 | return -ENOSYS; | |
1437 | } | |
1438 | } | |
1439 | ||
1440 | /* | |
e4421fec | 1441 | * This thread polls the fds in the set to consume the data and write |
3bd1e081 MD |
1442 | * it to tracefile if necessary. |
1443 | */ | |
1444 | void *lttng_consumer_thread_poll_fds(void *data) | |
1445 | { | |
1446 | int num_rdy, num_hup, high_prio, ret, i; | |
1447 | struct pollfd *pollfd = NULL; | |
1448 | /* local view of the streams */ | |
1449 | struct lttng_consumer_stream **local_stream = NULL; | |
1450 | /* local view of consumer_data.fds_count */ | |
1451 | int nb_fd = 0; | |
3bd1e081 | 1452 | struct lttng_consumer_local_data *ctx = data; |
00e2e675 DG |
1453 | struct lttng_ht *metadata_ht; |
1454 | struct lttng_ht_iter iter; | |
1455 | struct lttng_ht_node_ulong *node; | |
1456 | struct lttng_consumer_stream *metadata_stream; | |
1457 | ssize_t len; | |
1458 | ||
1459 | metadata_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
3bd1e081 | 1460 | |
e7b994a3 DG |
1461 | rcu_register_thread(); |
1462 | ||
effcf122 | 1463 | local_stream = zmalloc(sizeof(struct lttng_consumer_stream)); |
3bd1e081 MD |
1464 | |
1465 | while (1) { | |
1466 | high_prio = 0; | |
1467 | num_hup = 0; | |
1468 | ||
1469 | /* | |
e4421fec | 1470 | * the fds set has been updated, we need to update our |
3bd1e081 MD |
1471 | * local array as well |
1472 | */ | |
1473 | pthread_mutex_lock(&consumer_data.lock); | |
1474 | if (consumer_data.need_update) { | |
1475 | if (pollfd != NULL) { | |
1476 | free(pollfd); | |
1477 | pollfd = NULL; | |
1478 | } | |
1479 | if (local_stream != NULL) { | |
1480 | free(local_stream); | |
1481 | local_stream = NULL; | |
1482 | } | |
1483 | ||
1484 | /* allocate for all fds + 1 for the consumer_poll_pipe */ | |
effcf122 | 1485 | pollfd = zmalloc((consumer_data.stream_count + 1) * sizeof(struct pollfd)); |
3bd1e081 MD |
1486 | if (pollfd == NULL) { |
1487 | perror("pollfd malloc"); | |
1488 | pthread_mutex_unlock(&consumer_data.lock); | |
1489 | goto end; | |
1490 | } | |
1491 | ||
1492 | /* allocate for all fds + 1 for the consumer_poll_pipe */ | |
effcf122 | 1493 | local_stream = zmalloc((consumer_data.stream_count + 1) * |
3bd1e081 MD |
1494 | sizeof(struct lttng_consumer_stream)); |
1495 | if (local_stream == NULL) { | |
1496 | perror("local_stream malloc"); | |
1497 | pthread_mutex_unlock(&consumer_data.lock); | |
1498 | goto end; | |
1499 | } | |
00e2e675 DG |
1500 | ret = consumer_update_poll_array(ctx, &pollfd, local_stream, |
1501 | metadata_ht); | |
3bd1e081 MD |
1502 | if (ret < 0) { |
1503 | ERR("Error in allocating pollfd or local_outfds"); | |
1504 | lttng_consumer_send_error(ctx, CONSUMERD_POLL_ERROR); | |
1505 | pthread_mutex_unlock(&consumer_data.lock); | |
1506 | goto end; | |
1507 | } | |
1508 | nb_fd = ret; | |
1509 | consumer_data.need_update = 0; | |
1510 | } | |
1511 | pthread_mutex_unlock(&consumer_data.lock); | |
1512 | ||
4078b776 MD |
1513 | /* No FDs and consumer_quit, consumer_cleanup the thread */ |
1514 | if (nb_fd == 0 && consumer_quit == 1) { | |
1515 | goto end; | |
1516 | } | |
3bd1e081 | 1517 | /* poll on the array of fds */ |
88f2b785 | 1518 | restart: |
3bd1e081 MD |
1519 | DBG("polling on %d fd", nb_fd + 1); |
1520 | num_rdy = poll(pollfd, nb_fd + 1, consumer_poll_timeout); | |
1521 | DBG("poll num_rdy : %d", num_rdy); | |
1522 | if (num_rdy == -1) { | |
88f2b785 MD |
1523 | /* |
1524 | * Restart interrupted system call. | |
1525 | */ | |
1526 | if (errno == EINTR) { | |
1527 | goto restart; | |
1528 | } | |
3bd1e081 MD |
1529 | perror("Poll error"); |
1530 | lttng_consumer_send_error(ctx, CONSUMERD_POLL_ERROR); | |
1531 | goto end; | |
1532 | } else if (num_rdy == 0) { | |
1533 | DBG("Polling thread timed out"); | |
1534 | goto end; | |
1535 | } | |
1536 | ||
3bd1e081 | 1537 | /* |
00e2e675 DG |
1538 | * If the consumer_poll_pipe triggered poll go directly to the |
1539 | * beginning of the loop to update the array. We want to prioritize | |
1540 | * array update over low-priority reads. | |
3bd1e081 | 1541 | */ |
509bb1cf | 1542 | if (pollfd[nb_fd].revents & (POLLIN | POLLPRI)) { |
04fdd819 MD |
1543 | size_t pipe_readlen; |
1544 | char tmp; | |
1545 | ||
3bd1e081 | 1546 | DBG("consumer_poll_pipe wake up"); |
04fdd819 MD |
1547 | /* Consume 1 byte of pipe data */ |
1548 | do { | |
1549 | pipe_readlen = read(ctx->consumer_poll_pipe[0], &tmp, 1); | |
1550 | } while (pipe_readlen == -1 && errno == EINTR); | |
3bd1e081 MD |
1551 | continue; |
1552 | } | |
1553 | ||
1554 | /* Take care of high priority channels first. */ | |
1555 | for (i = 0; i < nb_fd; i++) { | |
00e2e675 DG |
1556 | /* Lookup for metadata which is the highest priority */ |
1557 | lttng_ht_lookup(metadata_ht, | |
1558 | (void *)((unsigned long) pollfd[i].fd), &iter); | |
1559 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1560 | if (node != NULL && | |
1561 | (pollfd[i].revents & (POLLIN | POLLPRI))) { | |
1562 | DBG("Urgent metadata read on fd %d", pollfd[i].fd); | |
1563 | metadata_stream = caa_container_of(node, | |
1564 | struct lttng_consumer_stream, waitfd_node); | |
1565 | high_prio = 1; | |
1566 | len = ctx->on_buffer_ready(metadata_stream, ctx); | |
1567 | /* it's ok to have an unavailable sub-buffer */ | |
1568 | if (len < 0 && len != -EAGAIN) { | |
1569 | goto end; | |
1570 | } else if (len > 0) { | |
1571 | metadata_stream->data_read = 1; | |
1572 | } | |
1573 | } else if (pollfd[i].revents & POLLPRI) { | |
d41f73b7 MD |
1574 | DBG("Urgent read on fd %d", pollfd[i].fd); |
1575 | high_prio = 1; | |
4078b776 | 1576 | len = ctx->on_buffer_ready(local_stream[i], ctx); |
d41f73b7 | 1577 | /* it's ok to have an unavailable sub-buffer */ |
4078b776 MD |
1578 | if (len < 0 && len != -EAGAIN) { |
1579 | goto end; | |
1580 | } else if (len > 0) { | |
1581 | local_stream[i]->data_read = 1; | |
d41f73b7 | 1582 | } |
3bd1e081 MD |
1583 | } |
1584 | } | |
1585 | ||
4078b776 MD |
1586 | /* |
1587 | * If we read high prio channel in this loop, try again | |
1588 | * for more high prio data. | |
1589 | */ | |
1590 | if (high_prio) { | |
3bd1e081 MD |
1591 | continue; |
1592 | } | |
1593 | ||
1594 | /* Take care of low priority channels. */ | |
4078b776 MD |
1595 | for (i = 0; i < nb_fd; i++) { |
1596 | if ((pollfd[i].revents & POLLIN) || | |
1597 | local_stream[i]->hangup_flush_done) { | |
4078b776 MD |
1598 | DBG("Normal read on fd %d", pollfd[i].fd); |
1599 | len = ctx->on_buffer_ready(local_stream[i], ctx); | |
1600 | /* it's ok to have an unavailable sub-buffer */ | |
1601 | if (len < 0 && len != -EAGAIN) { | |
1602 | goto end; | |
1603 | } else if (len > 0) { | |
1604 | local_stream[i]->data_read = 1; | |
1605 | } | |
1606 | } | |
1607 | } | |
1608 | ||
1609 | /* Handle hangup and errors */ | |
1610 | for (i = 0; i < nb_fd; i++) { | |
1611 | if (!local_stream[i]->hangup_flush_done | |
1612 | && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL)) | |
1613 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
1614 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
1615 | DBG("fd %d is hup|err|nval. Attempting flush and read.", | |
1616 | pollfd[i].fd); | |
1617 | lttng_ustconsumer_on_stream_hangup(local_stream[i]); | |
1618 | /* Attempt read again, for the data we just flushed. */ | |
1619 | local_stream[i]->data_read = 1; | |
1620 | } | |
1621 | /* | |
1622 | * If the poll flag is HUP/ERR/NVAL and we have | |
1623 | * read no data in this pass, we can remove the | |
1624 | * stream from its hash table. | |
1625 | */ | |
1626 | if ((pollfd[i].revents & POLLHUP)) { | |
1627 | DBG("Polling fd %d tells it has hung up.", pollfd[i].fd); | |
1628 | if (!local_stream[i]->data_read) { | |
00e2e675 DG |
1629 | if (local_stream[i]->metadata_flag) { |
1630 | iter.iter.node = &local_stream[i]->waitfd_node.node; | |
1631 | ret = lttng_ht_del(metadata_ht, &iter); | |
1632 | assert(!ret); | |
1633 | } | |
702b1ea4 | 1634 | consumer_del_stream(local_stream[i]); |
4078b776 MD |
1635 | num_hup++; |
1636 | } | |
1637 | } else if (pollfd[i].revents & POLLERR) { | |
1638 | ERR("Error returned in polling fd %d.", pollfd[i].fd); | |
1639 | if (!local_stream[i]->data_read) { | |
00e2e675 DG |
1640 | if (local_stream[i]->metadata_flag) { |
1641 | iter.iter.node = &local_stream[i]->waitfd_node.node; | |
1642 | ret = lttng_ht_del(metadata_ht, &iter); | |
1643 | assert(!ret); | |
1644 | } | |
702b1ea4 | 1645 | consumer_del_stream(local_stream[i]); |
4078b776 MD |
1646 | num_hup++; |
1647 | } | |
1648 | } else if (pollfd[i].revents & POLLNVAL) { | |
1649 | ERR("Polling fd %d tells fd is not open.", pollfd[i].fd); | |
1650 | if (!local_stream[i]->data_read) { | |
00e2e675 DG |
1651 | if (local_stream[i]->metadata_flag) { |
1652 | iter.iter.node = &local_stream[i]->waitfd_node.node; | |
1653 | ret = lttng_ht_del(metadata_ht, &iter); | |
1654 | assert(!ret); | |
1655 | } | |
702b1ea4 | 1656 | consumer_del_stream(local_stream[i]); |
4078b776 | 1657 | num_hup++; |
3bd1e081 MD |
1658 | } |
1659 | } | |
4078b776 | 1660 | local_stream[i]->data_read = 0; |
3bd1e081 MD |
1661 | } |
1662 | } | |
1663 | end: | |
1664 | DBG("polling thread exiting"); | |
1665 | if (pollfd != NULL) { | |
1666 | free(pollfd); | |
1667 | pollfd = NULL; | |
1668 | } | |
1669 | if (local_stream != NULL) { | |
1670 | free(local_stream); | |
1671 | local_stream = NULL; | |
1672 | } | |
e7b994a3 | 1673 | rcu_unregister_thread(); |
3bd1e081 MD |
1674 | return NULL; |
1675 | } | |
1676 | ||
1677 | /* | |
1678 | * This thread listens on the consumerd socket and receives the file | |
1679 | * descriptors from the session daemon. | |
1680 | */ | |
1681 | void *lttng_consumer_thread_receive_fds(void *data) | |
1682 | { | |
1683 | int sock, client_socket, ret; | |
1684 | /* | |
1685 | * structure to poll for incoming data on communication socket avoids | |
1686 | * making blocking sockets. | |
1687 | */ | |
1688 | struct pollfd consumer_sockpoll[2]; | |
1689 | struct lttng_consumer_local_data *ctx = data; | |
1690 | ||
e7b994a3 DG |
1691 | rcu_register_thread(); |
1692 | ||
3bd1e081 MD |
1693 | DBG("Creating command socket %s", ctx->consumer_command_sock_path); |
1694 | unlink(ctx->consumer_command_sock_path); | |
1695 | client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path); | |
1696 | if (client_socket < 0) { | |
1697 | ERR("Cannot create command socket"); | |
1698 | goto end; | |
1699 | } | |
1700 | ||
1701 | ret = lttcomm_listen_unix_sock(client_socket); | |
1702 | if (ret < 0) { | |
1703 | goto end; | |
1704 | } | |
1705 | ||
32258573 | 1706 | DBG("Sending ready command to lttng-sessiond"); |
3bd1e081 MD |
1707 | ret = lttng_consumer_send_error(ctx, CONSUMERD_COMMAND_SOCK_READY); |
1708 | /* return < 0 on error, but == 0 is not fatal */ | |
1709 | if (ret < 0) { | |
32258573 | 1710 | ERR("Error sending ready command to lttng-sessiond"); |
3bd1e081 MD |
1711 | goto end; |
1712 | } | |
1713 | ||
1714 | ret = fcntl(client_socket, F_SETFL, O_NONBLOCK); | |
1715 | if (ret < 0) { | |
1716 | perror("fcntl O_NONBLOCK"); | |
1717 | goto end; | |
1718 | } | |
1719 | ||
1720 | /* prepare the FDs to poll : to client socket and the should_quit pipe */ | |
1721 | consumer_sockpoll[0].fd = ctx->consumer_should_quit[0]; | |
1722 | consumer_sockpoll[0].events = POLLIN | POLLPRI; | |
1723 | consumer_sockpoll[1].fd = client_socket; | |
1724 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
1725 | ||
1726 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
1727 | goto end; | |
1728 | } | |
1729 | DBG("Connection on client_socket"); | |
1730 | ||
1731 | /* Blocking call, waiting for transmission */ | |
1732 | sock = lttcomm_accept_unix_sock(client_socket); | |
1733 | if (sock <= 0) { | |
1734 | WARN("On accept"); | |
1735 | goto end; | |
1736 | } | |
1737 | ret = fcntl(sock, F_SETFL, O_NONBLOCK); | |
1738 | if (ret < 0) { | |
1739 | perror("fcntl O_NONBLOCK"); | |
1740 | goto end; | |
1741 | } | |
1742 | ||
1743 | /* update the polling structure to poll on the established socket */ | |
1744 | consumer_sockpoll[1].fd = sock; | |
1745 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
1746 | ||
1747 | while (1) { | |
1748 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
1749 | goto end; | |
1750 | } | |
1751 | DBG("Incoming command on sock"); | |
1752 | ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
1753 | if (ret == -ENOENT) { | |
1754 | DBG("Received STOP command"); | |
1755 | goto end; | |
1756 | } | |
1757 | if (ret < 0) { | |
1758 | ERR("Communication interrupted on command socket"); | |
1759 | goto end; | |
1760 | } | |
1761 | if (consumer_quit) { | |
1762 | DBG("consumer_thread_receive_fds received quit from signal"); | |
1763 | goto end; | |
1764 | } | |
1765 | DBG("received fds on sock"); | |
1766 | } | |
1767 | end: | |
1768 | DBG("consumer_thread_receive_fds exiting"); | |
1769 | ||
1770 | /* | |
1771 | * when all fds have hung up, the polling thread | |
1772 | * can exit cleanly | |
1773 | */ | |
1774 | consumer_quit = 1; | |
1775 | ||
1776 | /* | |
1777 | * 2s of grace period, if no polling events occur during | |
1778 | * this period, the polling thread will exit even if there | |
1779 | * are still open FDs (should not happen, but safety mechanism). | |
1780 | */ | |
1781 | consumer_poll_timeout = LTTNG_CONSUMER_POLL_TIMEOUT; | |
1782 | ||
04fdd819 MD |
1783 | /* |
1784 | * Wake-up the other end by writing a null byte in the pipe | |
1785 | * (non-blocking). Important note: Because writing into the | |
1786 | * pipe is non-blocking (and therefore we allow dropping wakeup | |
1787 | * data, as long as there is wakeup data present in the pipe | |
1788 | * buffer to wake up the other end), the other end should | |
1789 | * perform the following sequence for waiting: | |
1790 | * 1) empty the pipe (reads). | |
1791 | * 2) perform update operation. | |
1792 | * 3) wait on the pipe (poll). | |
1793 | */ | |
1794 | do { | |
1795 | ret = write(ctx->consumer_poll_pipe[1], "", 1); | |
6f94560a | 1796 | } while (ret < 0 && errno == EINTR); |
e7b994a3 | 1797 | rcu_unregister_thread(); |
3bd1e081 MD |
1798 | return NULL; |
1799 | } | |
d41f73b7 | 1800 | |
4078b776 | 1801 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
1802 | struct lttng_consumer_local_data *ctx) |
1803 | { | |
1804 | switch (consumer_data.type) { | |
1805 | case LTTNG_CONSUMER_KERNEL: | |
1806 | return lttng_kconsumer_read_subbuffer(stream, ctx); | |
7753dea8 MD |
1807 | case LTTNG_CONSUMER32_UST: |
1808 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
1809 | return lttng_ustconsumer_read_subbuffer(stream, ctx); |
1810 | default: | |
1811 | ERR("Unknown consumer_data type"); | |
1812 | assert(0); | |
1813 | return -ENOSYS; | |
1814 | } | |
1815 | } | |
1816 | ||
1817 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
1818 | { | |
1819 | switch (consumer_data.type) { | |
1820 | case LTTNG_CONSUMER_KERNEL: | |
1821 | return lttng_kconsumer_on_recv_stream(stream); | |
7753dea8 MD |
1822 | case LTTNG_CONSUMER32_UST: |
1823 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
1824 | return lttng_ustconsumer_on_recv_stream(stream); |
1825 | default: | |
1826 | ERR("Unknown consumer_data type"); | |
1827 | assert(0); | |
1828 | return -ENOSYS; | |
1829 | } | |
1830 | } | |
e4421fec DG |
1831 | |
1832 | /* | |
1833 | * Allocate and set consumer data hash tables. | |
1834 | */ | |
1835 | void lttng_consumer_init(void) | |
1836 | { | |
1837 | consumer_data.stream_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
1838 | consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
00e2e675 | 1839 | consumer_data.relayd_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
e4421fec | 1840 | } |