Commit | Line | Data |
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3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License | |
7 | * as published by the Free Software Foundation; only version 2 | |
8 | * of the License. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
18 | */ | |
19 | ||
20 | #define _GNU_SOURCE | |
21 | #include <assert.h> | |
ca4537d3 | 22 | #include <fcntl.h> |
3bd1e081 MD |
23 | #include <poll.h> |
24 | #include <pthread.h> | |
25 | #include <stdlib.h> | |
26 | #include <string.h> | |
27 | #include <sys/mman.h> | |
28 | #include <sys/socket.h> | |
29 | #include <sys/types.h> | |
30 | #include <unistd.h> | |
31 | ||
990570ed | 32 | #include <common/common.h> |
10a8a223 DG |
33 | #include <common/kernel-ctl/kernel-ctl.h> |
34 | #include <common/sessiond-comm/sessiond-comm.h> | |
35 | #include <common/kernel-consumer/kernel-consumer.h> | |
36 | #include <common/ust-consumer/ust-consumer.h> | |
37 | ||
38 | #include "consumer.h" | |
3bd1e081 MD |
39 | |
40 | struct lttng_consumer_global_data consumer_data = { | |
3bd1e081 MD |
41 | .stream_count = 0, |
42 | .need_update = 1, | |
43 | .type = LTTNG_CONSUMER_UNKNOWN, | |
44 | }; | |
45 | ||
46 | /* timeout parameter, to control the polling thread grace period. */ | |
47 | int consumer_poll_timeout = -1; | |
48 | ||
49 | /* | |
50 | * Flag to inform the polling thread to quit when all fd hung up. Updated by | |
51 | * the consumer_thread_receive_fds when it notices that all fds has hung up. | |
52 | * Also updated by the signal handler (consumer_should_exit()). Read by the | |
53 | * polling threads. | |
54 | */ | |
55 | volatile int consumer_quit = 0; | |
56 | ||
57 | /* | |
58 | * Find a stream. The consumer_data.lock must be locked during this | |
59 | * call. | |
60 | */ | |
61 | static struct lttng_consumer_stream *consumer_find_stream(int key) | |
62 | { | |
e4421fec DG |
63 | struct lttng_ht_iter iter; |
64 | struct lttng_ht_node_ulong *node; | |
65 | struct lttng_consumer_stream *stream = NULL; | |
3bd1e081 | 66 | |
7ad0a0cb MD |
67 | /* Negative keys are lookup failures */ |
68 | if (key < 0) | |
69 | return NULL; | |
e4421fec | 70 | |
6065ceec DG |
71 | rcu_read_lock(); |
72 | ||
e4421fec DG |
73 | lttng_ht_lookup(consumer_data.stream_ht, (void *)((unsigned long) key), |
74 | &iter); | |
75 | node = lttng_ht_iter_get_node_ulong(&iter); | |
76 | if (node != NULL) { | |
77 | stream = caa_container_of(node, struct lttng_consumer_stream, node); | |
3bd1e081 | 78 | } |
e4421fec | 79 | |
6065ceec DG |
80 | rcu_read_unlock(); |
81 | ||
e4421fec | 82 | return stream; |
3bd1e081 MD |
83 | } |
84 | ||
7ad0a0cb MD |
85 | static void consumer_steal_stream_key(int key) |
86 | { | |
87 | struct lttng_consumer_stream *stream; | |
88 | ||
04253271 | 89 | rcu_read_lock(); |
7ad0a0cb | 90 | stream = consumer_find_stream(key); |
04253271 | 91 | if (stream) { |
7ad0a0cb | 92 | stream->key = -1; |
04253271 MD |
93 | /* |
94 | * We don't want the lookup to match, but we still need | |
95 | * to iterate on this stream when iterating over the hash table. Just | |
96 | * change the node key. | |
97 | */ | |
98 | stream->node.key = -1; | |
99 | } | |
100 | rcu_read_unlock(); | |
7ad0a0cb MD |
101 | } |
102 | ||
3bd1e081 MD |
103 | static struct lttng_consumer_channel *consumer_find_channel(int key) |
104 | { | |
e4421fec DG |
105 | struct lttng_ht_iter iter; |
106 | struct lttng_ht_node_ulong *node; | |
107 | struct lttng_consumer_channel *channel = NULL; | |
3bd1e081 | 108 | |
7ad0a0cb MD |
109 | /* Negative keys are lookup failures */ |
110 | if (key < 0) | |
111 | return NULL; | |
e4421fec | 112 | |
6065ceec DG |
113 | rcu_read_lock(); |
114 | ||
e4421fec DG |
115 | lttng_ht_lookup(consumer_data.channel_ht, (void *)((unsigned long) key), |
116 | &iter); | |
117 | node = lttng_ht_iter_get_node_ulong(&iter); | |
118 | if (node != NULL) { | |
119 | channel = caa_container_of(node, struct lttng_consumer_channel, node); | |
3bd1e081 | 120 | } |
e4421fec | 121 | |
6065ceec DG |
122 | rcu_read_unlock(); |
123 | ||
e4421fec | 124 | return channel; |
3bd1e081 MD |
125 | } |
126 | ||
7ad0a0cb MD |
127 | static void consumer_steal_channel_key(int key) |
128 | { | |
129 | struct lttng_consumer_channel *channel; | |
130 | ||
04253271 | 131 | rcu_read_lock(); |
7ad0a0cb | 132 | channel = consumer_find_channel(key); |
04253271 | 133 | if (channel) { |
7ad0a0cb | 134 | channel->key = -1; |
04253271 MD |
135 | /* |
136 | * We don't want the lookup to match, but we still need | |
137 | * to iterate on this channel when iterating over the hash table. Just | |
138 | * change the node key. | |
139 | */ | |
140 | channel->node.key = -1; | |
141 | } | |
142 | rcu_read_unlock(); | |
7ad0a0cb MD |
143 | } |
144 | ||
702b1ea4 MD |
145 | static |
146 | void consumer_free_stream(struct rcu_head *head) | |
147 | { | |
148 | struct lttng_ht_node_ulong *node = | |
149 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
150 | struct lttng_consumer_stream *stream = | |
151 | caa_container_of(node, struct lttng_consumer_stream, node); | |
152 | ||
153 | free(stream); | |
154 | } | |
155 | ||
3bd1e081 MD |
156 | /* |
157 | * Remove a stream from the global list protected by a mutex. This | |
158 | * function is also responsible for freeing its data structures. | |
159 | */ | |
160 | void consumer_del_stream(struct lttng_consumer_stream *stream) | |
161 | { | |
162 | int ret; | |
e4421fec | 163 | struct lttng_ht_iter iter; |
3bd1e081 MD |
164 | struct lttng_consumer_channel *free_chan = NULL; |
165 | ||
166 | pthread_mutex_lock(&consumer_data.lock); | |
167 | ||
168 | switch (consumer_data.type) { | |
169 | case LTTNG_CONSUMER_KERNEL: | |
170 | if (stream->mmap_base != NULL) { | |
171 | ret = munmap(stream->mmap_base, stream->mmap_len); | |
172 | if (ret != 0) { | |
173 | perror("munmap"); | |
174 | } | |
175 | } | |
176 | break; | |
7753dea8 MD |
177 | case LTTNG_CONSUMER32_UST: |
178 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
179 | lttng_ustconsumer_del_stream(stream); |
180 | break; | |
181 | default: | |
182 | ERR("Unknown consumer_data type"); | |
183 | assert(0); | |
184 | goto end; | |
185 | } | |
186 | ||
6065ceec | 187 | rcu_read_lock(); |
04253271 MD |
188 | iter.iter.node = &stream->node.node; |
189 | ret = lttng_ht_del(consumer_data.stream_ht, &iter); | |
190 | assert(!ret); | |
e4421fec | 191 | |
6065ceec DG |
192 | rcu_read_unlock(); |
193 | ||
3bd1e081 MD |
194 | if (consumer_data.stream_count <= 0) { |
195 | goto end; | |
196 | } | |
197 | consumer_data.stream_count--; | |
198 | if (!stream) { | |
199 | goto end; | |
200 | } | |
201 | if (stream->out_fd >= 0) { | |
4c462e79 MD |
202 | ret = close(stream->out_fd); |
203 | if (ret) { | |
204 | PERROR("close"); | |
205 | } | |
3bd1e081 | 206 | } |
b5c5fc29 | 207 | if (stream->wait_fd >= 0 && !stream->wait_fd_is_copy) { |
4c462e79 MD |
208 | ret = close(stream->wait_fd); |
209 | if (ret) { | |
210 | PERROR("close"); | |
211 | } | |
3bd1e081 | 212 | } |
2c1dd183 | 213 | if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) { |
4c462e79 MD |
214 | ret = close(stream->shm_fd); |
215 | if (ret) { | |
216 | PERROR("close"); | |
217 | } | |
3bd1e081 MD |
218 | } |
219 | if (!--stream->chan->refcount) | |
220 | free_chan = stream->chan; | |
702b1ea4 MD |
221 | |
222 | call_rcu(&stream->node.head, consumer_free_stream); | |
3bd1e081 MD |
223 | end: |
224 | consumer_data.need_update = 1; | |
225 | pthread_mutex_unlock(&consumer_data.lock); | |
226 | ||
227 | if (free_chan) | |
228 | consumer_del_channel(free_chan); | |
229 | } | |
230 | ||
231 | struct lttng_consumer_stream *consumer_allocate_stream( | |
232 | int channel_key, int stream_key, | |
233 | int shm_fd, int wait_fd, | |
234 | enum lttng_consumer_stream_state state, | |
235 | uint64_t mmap_len, | |
236 | enum lttng_event_output output, | |
6df2e2c9 MD |
237 | const char *path_name, |
238 | uid_t uid, | |
239 | gid_t gid) | |
3bd1e081 MD |
240 | { |
241 | struct lttng_consumer_stream *stream; | |
242 | int ret; | |
243 | ||
effcf122 | 244 | stream = zmalloc(sizeof(*stream)); |
3bd1e081 MD |
245 | if (stream == NULL) { |
246 | perror("malloc struct lttng_consumer_stream"); | |
247 | goto end; | |
248 | } | |
249 | stream->chan = consumer_find_channel(channel_key); | |
250 | if (!stream->chan) { | |
251 | perror("Unable to find channel key"); | |
252 | goto end; | |
253 | } | |
254 | stream->chan->refcount++; | |
255 | stream->key = stream_key; | |
256 | stream->shm_fd = shm_fd; | |
257 | stream->wait_fd = wait_fd; | |
258 | stream->out_fd = -1; | |
259 | stream->out_fd_offset = 0; | |
260 | stream->state = state; | |
261 | stream->mmap_len = mmap_len; | |
262 | stream->mmap_base = NULL; | |
263 | stream->output = output; | |
6df2e2c9 MD |
264 | stream->uid = uid; |
265 | stream->gid = gid; | |
3bd1e081 MD |
266 | strncpy(stream->path_name, path_name, PATH_MAX - 1); |
267 | stream->path_name[PATH_MAX - 1] = '\0'; | |
e4421fec | 268 | lttng_ht_node_init_ulong(&stream->node, stream->key); |
3bd1e081 MD |
269 | |
270 | switch (consumer_data.type) { | |
271 | case LTTNG_CONSUMER_KERNEL: | |
272 | break; | |
7753dea8 MD |
273 | case LTTNG_CONSUMER32_UST: |
274 | case LTTNG_CONSUMER64_UST: | |
5af2f756 | 275 | stream->cpu = stream->chan->cpucount++; |
3bd1e081 MD |
276 | ret = lttng_ustconsumer_allocate_stream(stream); |
277 | if (ret) { | |
278 | free(stream); | |
279 | return NULL; | |
280 | } | |
281 | break; | |
282 | default: | |
283 | ERR("Unknown consumer_data type"); | |
284 | assert(0); | |
285 | goto end; | |
286 | } | |
287 | DBG("Allocated stream %s (key %d, shm_fd %d, wait_fd %d, mmap_len %llu, out_fd %d)", | |
288 | stream->path_name, stream->key, | |
289 | stream->shm_fd, | |
290 | stream->wait_fd, | |
291 | (unsigned long long) stream->mmap_len, | |
292 | stream->out_fd); | |
293 | end: | |
294 | return stream; | |
295 | } | |
296 | ||
297 | /* | |
298 | * Add a stream to the global list protected by a mutex. | |
299 | */ | |
300 | int consumer_add_stream(struct lttng_consumer_stream *stream) | |
301 | { | |
302 | int ret = 0; | |
303 | ||
304 | pthread_mutex_lock(&consumer_data.lock); | |
7ad0a0cb MD |
305 | /* Steal stream identifier, for UST */ |
306 | consumer_steal_stream_key(stream->key); | |
6065ceec | 307 | rcu_read_lock(); |
04253271 | 308 | lttng_ht_add_unique_ulong(consumer_data.stream_ht, &stream->node); |
6065ceec | 309 | rcu_read_unlock(); |
3bd1e081 MD |
310 | consumer_data.stream_count++; |
311 | consumer_data.need_update = 1; | |
312 | ||
313 | switch (consumer_data.type) { | |
314 | case LTTNG_CONSUMER_KERNEL: | |
315 | break; | |
7753dea8 MD |
316 | case LTTNG_CONSUMER32_UST: |
317 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
318 | /* Streams are in CPU number order (we rely on this) */ |
319 | stream->cpu = stream->chan->nr_streams++; | |
320 | break; | |
321 | default: | |
322 | ERR("Unknown consumer_data type"); | |
323 | assert(0); | |
324 | goto end; | |
325 | } | |
326 | ||
327 | end: | |
328 | pthread_mutex_unlock(&consumer_data.lock); | |
702b1ea4 | 329 | |
3bd1e081 MD |
330 | return ret; |
331 | } | |
332 | ||
333 | /* | |
334 | * Update a stream according to what we just received. | |
335 | */ | |
336 | void consumer_change_stream_state(int stream_key, | |
337 | enum lttng_consumer_stream_state state) | |
338 | { | |
339 | struct lttng_consumer_stream *stream; | |
340 | ||
341 | pthread_mutex_lock(&consumer_data.lock); | |
342 | stream = consumer_find_stream(stream_key); | |
343 | if (stream) { | |
344 | stream->state = state; | |
345 | } | |
346 | consumer_data.need_update = 1; | |
347 | pthread_mutex_unlock(&consumer_data.lock); | |
348 | } | |
349 | ||
702b1ea4 MD |
350 | static |
351 | void consumer_free_channel(struct rcu_head *head) | |
352 | { | |
353 | struct lttng_ht_node_ulong *node = | |
354 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
355 | struct lttng_consumer_channel *channel = | |
356 | caa_container_of(node, struct lttng_consumer_channel, node); | |
357 | ||
358 | free(channel); | |
359 | } | |
360 | ||
3bd1e081 MD |
361 | /* |
362 | * Remove a channel from the global list protected by a mutex. This | |
363 | * function is also responsible for freeing its data structures. | |
364 | */ | |
365 | void consumer_del_channel(struct lttng_consumer_channel *channel) | |
366 | { | |
367 | int ret; | |
e4421fec | 368 | struct lttng_ht_iter iter; |
3bd1e081 MD |
369 | |
370 | pthread_mutex_lock(&consumer_data.lock); | |
371 | ||
372 | switch (consumer_data.type) { | |
373 | case LTTNG_CONSUMER_KERNEL: | |
374 | break; | |
7753dea8 MD |
375 | case LTTNG_CONSUMER32_UST: |
376 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
377 | lttng_ustconsumer_del_channel(channel); |
378 | break; | |
379 | default: | |
380 | ERR("Unknown consumer_data type"); | |
381 | assert(0); | |
382 | goto end; | |
383 | } | |
384 | ||
6065ceec | 385 | rcu_read_lock(); |
04253271 MD |
386 | iter.iter.node = &channel->node.node; |
387 | ret = lttng_ht_del(consumer_data.channel_ht, &iter); | |
388 | assert(!ret); | |
6065ceec DG |
389 | rcu_read_unlock(); |
390 | ||
3bd1e081 MD |
391 | if (channel->mmap_base != NULL) { |
392 | ret = munmap(channel->mmap_base, channel->mmap_len); | |
393 | if (ret != 0) { | |
394 | perror("munmap"); | |
395 | } | |
396 | } | |
b5c5fc29 | 397 | if (channel->wait_fd >= 0 && !channel->wait_fd_is_copy) { |
4c462e79 MD |
398 | ret = close(channel->wait_fd); |
399 | if (ret) { | |
400 | PERROR("close"); | |
401 | } | |
3bd1e081 | 402 | } |
2c1dd183 | 403 | if (channel->shm_fd >= 0 && channel->wait_fd != channel->shm_fd) { |
4c462e79 MD |
404 | ret = close(channel->shm_fd); |
405 | if (ret) { | |
406 | PERROR("close"); | |
407 | } | |
3bd1e081 | 408 | } |
702b1ea4 MD |
409 | |
410 | call_rcu(&channel->node.head, consumer_free_channel); | |
3bd1e081 MD |
411 | end: |
412 | pthread_mutex_unlock(&consumer_data.lock); | |
413 | } | |
414 | ||
415 | struct lttng_consumer_channel *consumer_allocate_channel( | |
416 | int channel_key, | |
417 | int shm_fd, int wait_fd, | |
418 | uint64_t mmap_len, | |
419 | uint64_t max_sb_size) | |
420 | { | |
421 | struct lttng_consumer_channel *channel; | |
422 | int ret; | |
423 | ||
276b26d1 | 424 | channel = zmalloc(sizeof(*channel)); |
3bd1e081 MD |
425 | if (channel == NULL) { |
426 | perror("malloc struct lttng_consumer_channel"); | |
427 | goto end; | |
428 | } | |
429 | channel->key = channel_key; | |
430 | channel->shm_fd = shm_fd; | |
431 | channel->wait_fd = wait_fd; | |
432 | channel->mmap_len = mmap_len; | |
433 | channel->max_sb_size = max_sb_size; | |
434 | channel->refcount = 0; | |
435 | channel->nr_streams = 0; | |
e4421fec | 436 | lttng_ht_node_init_ulong(&channel->node, channel->key); |
3bd1e081 MD |
437 | |
438 | switch (consumer_data.type) { | |
439 | case LTTNG_CONSUMER_KERNEL: | |
440 | channel->mmap_base = NULL; | |
441 | channel->mmap_len = 0; | |
442 | break; | |
7753dea8 MD |
443 | case LTTNG_CONSUMER32_UST: |
444 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
445 | ret = lttng_ustconsumer_allocate_channel(channel); |
446 | if (ret) { | |
447 | free(channel); | |
448 | return NULL; | |
449 | } | |
450 | break; | |
451 | default: | |
452 | ERR("Unknown consumer_data type"); | |
453 | assert(0); | |
454 | goto end; | |
455 | } | |
456 | DBG("Allocated channel (key %d, shm_fd %d, wait_fd %d, mmap_len %llu, max_sb_size %llu)", | |
457 | channel->key, | |
458 | channel->shm_fd, | |
459 | channel->wait_fd, | |
460 | (unsigned long long) channel->mmap_len, | |
461 | (unsigned long long) channel->max_sb_size); | |
462 | end: | |
463 | return channel; | |
464 | } | |
465 | ||
466 | /* | |
467 | * Add a channel to the global list protected by a mutex. | |
468 | */ | |
469 | int consumer_add_channel(struct lttng_consumer_channel *channel) | |
470 | { | |
3bd1e081 | 471 | pthread_mutex_lock(&consumer_data.lock); |
7ad0a0cb MD |
472 | /* Steal channel identifier, for UST */ |
473 | consumer_steal_channel_key(channel->key); | |
6065ceec | 474 | rcu_read_lock(); |
04253271 | 475 | lttng_ht_add_unique_ulong(consumer_data.channel_ht, &channel->node); |
6065ceec | 476 | rcu_read_unlock(); |
3bd1e081 | 477 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 478 | |
7ad0a0cb | 479 | return 0; |
3bd1e081 MD |
480 | } |
481 | ||
482 | /* | |
483 | * Allocate the pollfd structure and the local view of the out fds to avoid | |
484 | * doing a lookup in the linked list and concurrency issues when writing is | |
485 | * needed. Called with consumer_data.lock held. | |
486 | * | |
487 | * Returns the number of fds in the structures. | |
488 | */ | |
489 | int consumer_update_poll_array( | |
490 | struct lttng_consumer_local_data *ctx, struct pollfd **pollfd, | |
491 | struct lttng_consumer_stream **local_stream) | |
492 | { | |
3bd1e081 | 493 | int i = 0; |
e4421fec DG |
494 | struct lttng_ht_iter iter; |
495 | struct lttng_consumer_stream *stream; | |
3bd1e081 MD |
496 | |
497 | DBG("Updating poll fd array"); | |
481d6c57 | 498 | rcu_read_lock(); |
e4421fec DG |
499 | cds_lfht_for_each_entry(consumer_data.stream_ht->ht, &iter.iter, stream, |
500 | node.node) { | |
501 | if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM) { | |
3bd1e081 MD |
502 | continue; |
503 | } | |
e4421fec DG |
504 | DBG("Active FD %d", stream->wait_fd); |
505 | (*pollfd)[i].fd = stream->wait_fd; | |
3bd1e081 | 506 | (*pollfd)[i].events = POLLIN | POLLPRI; |
e4421fec | 507 | local_stream[i] = stream; |
3bd1e081 MD |
508 | i++; |
509 | } | |
481d6c57 | 510 | rcu_read_unlock(); |
3bd1e081 MD |
511 | |
512 | /* | |
513 | * Insert the consumer_poll_pipe at the end of the array and don't | |
514 | * increment i so nb_fd is the number of real FD. | |
515 | */ | |
516 | (*pollfd)[i].fd = ctx->consumer_poll_pipe[0]; | |
517 | (*pollfd)[i].events = POLLIN; | |
518 | return i; | |
519 | } | |
520 | ||
521 | /* | |
522 | * Poll on the should_quit pipe and the command socket return -1 on error and | |
523 | * should exit, 0 if data is available on the command socket | |
524 | */ | |
525 | int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll) | |
526 | { | |
527 | int num_rdy; | |
528 | ||
a8b0b341 | 529 | restart: |
3bd1e081 MD |
530 | num_rdy = poll(consumer_sockpoll, 2, -1); |
531 | if (num_rdy == -1) { | |
a8b0b341 MD |
532 | /* |
533 | * Restart interrupted system call. | |
534 | */ | |
535 | if (errno == EINTR) { | |
536 | goto restart; | |
537 | } | |
3bd1e081 MD |
538 | perror("Poll error"); |
539 | goto exit; | |
540 | } | |
541 | if (consumer_sockpoll[0].revents == POLLIN) { | |
542 | DBG("consumer_should_quit wake up"); | |
543 | goto exit; | |
544 | } | |
545 | return 0; | |
546 | ||
547 | exit: | |
548 | return -1; | |
549 | } | |
550 | ||
551 | /* | |
552 | * Set the error socket. | |
553 | */ | |
554 | void lttng_consumer_set_error_sock( | |
555 | struct lttng_consumer_local_data *ctx, int sock) | |
556 | { | |
557 | ctx->consumer_error_socket = sock; | |
558 | } | |
559 | ||
560 | /* | |
561 | * Set the command socket path. | |
562 | */ | |
563 | ||
564 | void lttng_consumer_set_command_sock_path( | |
565 | struct lttng_consumer_local_data *ctx, char *sock) | |
566 | { | |
567 | ctx->consumer_command_sock_path = sock; | |
568 | } | |
569 | ||
570 | /* | |
571 | * Send return code to the session daemon. | |
572 | * If the socket is not defined, we return 0, it is not a fatal error | |
573 | */ | |
574 | int lttng_consumer_send_error( | |
575 | struct lttng_consumer_local_data *ctx, int cmd) | |
576 | { | |
577 | if (ctx->consumer_error_socket > 0) { | |
578 | return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd, | |
579 | sizeof(enum lttcomm_sessiond_command)); | |
580 | } | |
581 | ||
582 | return 0; | |
583 | } | |
584 | ||
585 | /* | |
586 | * Close all the tracefiles and stream fds, should be called when all instances | |
587 | * are destroyed. | |
588 | */ | |
589 | void lttng_consumer_cleanup(void) | |
590 | { | |
e4421fec | 591 | struct lttng_ht_iter iter; |
6065ceec DG |
592 | struct lttng_ht_node_ulong *node; |
593 | ||
594 | rcu_read_lock(); | |
3bd1e081 MD |
595 | |
596 | /* | |
6065ceec DG |
597 | * close all outfd. Called when there are no more threads running (after |
598 | * joining on the threads), no need to protect list iteration with mutex. | |
3bd1e081 | 599 | */ |
6065ceec DG |
600 | cds_lfht_for_each_entry(consumer_data.stream_ht->ht, &iter.iter, node, |
601 | node) { | |
702b1ea4 MD |
602 | struct lttng_consumer_stream *stream = |
603 | caa_container_of(node, struct lttng_consumer_stream, node); | |
604 | consumer_del_stream(stream); | |
3bd1e081 | 605 | } |
e4421fec | 606 | |
6065ceec DG |
607 | cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, node, |
608 | node) { | |
702b1ea4 MD |
609 | struct lttng_consumer_channel *channel = |
610 | caa_container_of(node, struct lttng_consumer_channel, node); | |
611 | consumer_del_channel(channel); | |
3bd1e081 | 612 | } |
6065ceec DG |
613 | |
614 | rcu_read_unlock(); | |
3bd1e081 MD |
615 | } |
616 | ||
617 | /* | |
618 | * Called from signal handler. | |
619 | */ | |
620 | void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx) | |
621 | { | |
622 | int ret; | |
623 | consumer_quit = 1; | |
624 | ret = write(ctx->consumer_should_quit[1], "4", 1); | |
625 | if (ret < 0) { | |
626 | perror("write consumer quit"); | |
627 | } | |
628 | } | |
629 | ||
630 | void lttng_consumer_sync_trace_file( | |
631 | struct lttng_consumer_stream *stream, off_t orig_offset) | |
632 | { | |
633 | int outfd = stream->out_fd; | |
634 | ||
635 | /* | |
636 | * This does a blocking write-and-wait on any page that belongs to the | |
637 | * subbuffer prior to the one we just wrote. | |
638 | * Don't care about error values, as these are just hints and ways to | |
639 | * limit the amount of page cache used. | |
640 | */ | |
641 | if (orig_offset < stream->chan->max_sb_size) { | |
642 | return; | |
643 | } | |
ca4537d3 | 644 | sync_file_range(outfd, orig_offset - stream->chan->max_sb_size, |
3bd1e081 MD |
645 | stream->chan->max_sb_size, |
646 | SYNC_FILE_RANGE_WAIT_BEFORE | |
647 | | SYNC_FILE_RANGE_WRITE | |
648 | | SYNC_FILE_RANGE_WAIT_AFTER); | |
649 | /* | |
650 | * Give hints to the kernel about how we access the file: | |
651 | * POSIX_FADV_DONTNEED : we won't re-access data in a near future after | |
652 | * we write it. | |
653 | * | |
654 | * We need to call fadvise again after the file grows because the | |
655 | * kernel does not seem to apply fadvise to non-existing parts of the | |
656 | * file. | |
657 | * | |
658 | * Call fadvise _after_ having waited for the page writeback to | |
659 | * complete because the dirty page writeback semantic is not well | |
660 | * defined. So it can be expected to lead to lower throughput in | |
661 | * streaming. | |
662 | */ | |
663 | posix_fadvise(outfd, orig_offset - stream->chan->max_sb_size, | |
664 | stream->chan->max_sb_size, POSIX_FADV_DONTNEED); | |
665 | } | |
666 | ||
667 | /* | |
668 | * Initialise the necessary environnement : | |
669 | * - create a new context | |
670 | * - create the poll_pipe | |
671 | * - create the should_quit pipe (for signal handler) | |
672 | * - create the thread pipe (for splice) | |
673 | * | |
674 | * Takes a function pointer as argument, this function is called when data is | |
675 | * available on a buffer. This function is responsible to do the | |
676 | * kernctl_get_next_subbuf, read the data with mmap or splice depending on the | |
677 | * buffer configuration and then kernctl_put_next_subbuf at the end. | |
678 | * | |
679 | * Returns a pointer to the new context or NULL on error. | |
680 | */ | |
681 | struct lttng_consumer_local_data *lttng_consumer_create( | |
682 | enum lttng_consumer_type type, | |
f5204c94 | 683 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
d41f73b7 | 684 | struct lttng_consumer_local_data *ctx), |
3bd1e081 MD |
685 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
686 | int (*recv_stream)(struct lttng_consumer_stream *stream), | |
687 | int (*update_stream)(int stream_key, uint32_t state)) | |
688 | { | |
689 | int ret, i; | |
690 | struct lttng_consumer_local_data *ctx; | |
691 | ||
692 | assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN || | |
693 | consumer_data.type == type); | |
694 | consumer_data.type = type; | |
695 | ||
effcf122 | 696 | ctx = zmalloc(sizeof(struct lttng_consumer_local_data)); |
3bd1e081 MD |
697 | if (ctx == NULL) { |
698 | perror("allocating context"); | |
699 | goto error; | |
700 | } | |
701 | ||
702 | ctx->consumer_error_socket = -1; | |
703 | /* assign the callbacks */ | |
704 | ctx->on_buffer_ready = buffer_ready; | |
705 | ctx->on_recv_channel = recv_channel; | |
706 | ctx->on_recv_stream = recv_stream; | |
707 | ctx->on_update_stream = update_stream; | |
708 | ||
709 | ret = pipe(ctx->consumer_poll_pipe); | |
710 | if (ret < 0) { | |
711 | perror("Error creating poll pipe"); | |
712 | goto error_poll_pipe; | |
713 | } | |
714 | ||
715 | ret = pipe(ctx->consumer_should_quit); | |
716 | if (ret < 0) { | |
717 | perror("Error creating recv pipe"); | |
718 | goto error_quit_pipe; | |
719 | } | |
720 | ||
721 | ret = pipe(ctx->consumer_thread_pipe); | |
722 | if (ret < 0) { | |
723 | perror("Error creating thread pipe"); | |
724 | goto error_thread_pipe; | |
725 | } | |
726 | ||
727 | return ctx; | |
728 | ||
729 | ||
730 | error_thread_pipe: | |
731 | for (i = 0; i < 2; i++) { | |
732 | int err; | |
733 | ||
734 | err = close(ctx->consumer_should_quit[i]); | |
4c462e79 MD |
735 | if (err) { |
736 | PERROR("close"); | |
737 | } | |
3bd1e081 MD |
738 | } |
739 | error_quit_pipe: | |
740 | for (i = 0; i < 2; i++) { | |
741 | int err; | |
742 | ||
743 | err = close(ctx->consumer_poll_pipe[i]); | |
4c462e79 MD |
744 | if (err) { |
745 | PERROR("close"); | |
746 | } | |
3bd1e081 MD |
747 | } |
748 | error_poll_pipe: | |
749 | free(ctx); | |
750 | error: | |
751 | return NULL; | |
752 | } | |
753 | ||
754 | /* | |
755 | * Close all fds associated with the instance and free the context. | |
756 | */ | |
757 | void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx) | |
758 | { | |
4c462e79 MD |
759 | int ret; |
760 | ||
761 | ret = close(ctx->consumer_error_socket); | |
762 | if (ret) { | |
763 | PERROR("close"); | |
764 | } | |
765 | ret = close(ctx->consumer_thread_pipe[0]); | |
766 | if (ret) { | |
767 | PERROR("close"); | |
768 | } | |
769 | ret = close(ctx->consumer_thread_pipe[1]); | |
770 | if (ret) { | |
771 | PERROR("close"); | |
772 | } | |
773 | ret = close(ctx->consumer_poll_pipe[0]); | |
774 | if (ret) { | |
775 | PERROR("close"); | |
776 | } | |
777 | ret = close(ctx->consumer_poll_pipe[1]); | |
778 | if (ret) { | |
779 | PERROR("close"); | |
780 | } | |
781 | ret = close(ctx->consumer_should_quit[0]); | |
782 | if (ret) { | |
783 | PERROR("close"); | |
784 | } | |
785 | ret = close(ctx->consumer_should_quit[1]); | |
786 | if (ret) { | |
787 | PERROR("close"); | |
788 | } | |
3bd1e081 MD |
789 | unlink(ctx->consumer_command_sock_path); |
790 | free(ctx); | |
791 | } | |
792 | ||
793 | /* | |
794 | * Mmap the ring buffer, read it and write the data to the tracefile. | |
795 | * | |
796 | * Returns the number of bytes written | |
797 | */ | |
f5204c94 | 798 | ssize_t lttng_consumer_on_read_subbuffer_mmap( |
3bd1e081 MD |
799 | struct lttng_consumer_local_data *ctx, |
800 | struct lttng_consumer_stream *stream, unsigned long len) | |
801 | { | |
802 | switch (consumer_data.type) { | |
803 | case LTTNG_CONSUMER_KERNEL: | |
804 | return lttng_kconsumer_on_read_subbuffer_mmap(ctx, stream, len); | |
7753dea8 MD |
805 | case LTTNG_CONSUMER32_UST: |
806 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
807 | return lttng_ustconsumer_on_read_subbuffer_mmap(ctx, stream, len); |
808 | default: | |
809 | ERR("Unknown consumer_data type"); | |
810 | assert(0); | |
811 | } | |
812 | } | |
813 | ||
814 | /* | |
815 | * Splice the data from the ring buffer to the tracefile. | |
816 | * | |
817 | * Returns the number of bytes spliced. | |
818 | */ | |
f5204c94 | 819 | ssize_t lttng_consumer_on_read_subbuffer_splice( |
3bd1e081 MD |
820 | struct lttng_consumer_local_data *ctx, |
821 | struct lttng_consumer_stream *stream, unsigned long len) | |
822 | { | |
823 | switch (consumer_data.type) { | |
824 | case LTTNG_CONSUMER_KERNEL: | |
825 | return lttng_kconsumer_on_read_subbuffer_splice(ctx, stream, len); | |
7753dea8 MD |
826 | case LTTNG_CONSUMER32_UST: |
827 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
828 | return -ENOSYS; |
829 | default: | |
830 | ERR("Unknown consumer_data type"); | |
831 | assert(0); | |
832 | return -ENOSYS; | |
833 | } | |
834 | ||
835 | } | |
836 | ||
837 | /* | |
838 | * Take a snapshot for a specific fd | |
839 | * | |
840 | * Returns 0 on success, < 0 on error | |
841 | */ | |
842 | int lttng_consumer_take_snapshot(struct lttng_consumer_local_data *ctx, | |
843 | struct lttng_consumer_stream *stream) | |
844 | { | |
845 | switch (consumer_data.type) { | |
846 | case LTTNG_CONSUMER_KERNEL: | |
847 | return lttng_kconsumer_take_snapshot(ctx, stream); | |
7753dea8 MD |
848 | case LTTNG_CONSUMER32_UST: |
849 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
850 | return lttng_ustconsumer_take_snapshot(ctx, stream); |
851 | default: | |
852 | ERR("Unknown consumer_data type"); | |
853 | assert(0); | |
854 | return -ENOSYS; | |
855 | } | |
856 | ||
857 | } | |
858 | ||
859 | /* | |
860 | * Get the produced position | |
861 | * | |
862 | * Returns 0 on success, < 0 on error | |
863 | */ | |
864 | int lttng_consumer_get_produced_snapshot( | |
865 | struct lttng_consumer_local_data *ctx, | |
866 | struct lttng_consumer_stream *stream, | |
867 | unsigned long *pos) | |
868 | { | |
869 | switch (consumer_data.type) { | |
870 | case LTTNG_CONSUMER_KERNEL: | |
871 | return lttng_kconsumer_get_produced_snapshot(ctx, stream, pos); | |
7753dea8 MD |
872 | case LTTNG_CONSUMER32_UST: |
873 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
874 | return lttng_ustconsumer_get_produced_snapshot(ctx, stream, pos); |
875 | default: | |
876 | ERR("Unknown consumer_data type"); | |
877 | assert(0); | |
878 | return -ENOSYS; | |
879 | } | |
880 | } | |
881 | ||
882 | int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, | |
883 | int sock, struct pollfd *consumer_sockpoll) | |
884 | { | |
885 | switch (consumer_data.type) { | |
886 | case LTTNG_CONSUMER_KERNEL: | |
887 | return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
7753dea8 MD |
888 | case LTTNG_CONSUMER32_UST: |
889 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
890 | return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll); |
891 | default: | |
892 | ERR("Unknown consumer_data type"); | |
893 | assert(0); | |
894 | return -ENOSYS; | |
895 | } | |
896 | } | |
897 | ||
898 | /* | |
e4421fec | 899 | * This thread polls the fds in the set to consume the data and write |
3bd1e081 MD |
900 | * it to tracefile if necessary. |
901 | */ | |
902 | void *lttng_consumer_thread_poll_fds(void *data) | |
903 | { | |
904 | int num_rdy, num_hup, high_prio, ret, i; | |
905 | struct pollfd *pollfd = NULL; | |
906 | /* local view of the streams */ | |
907 | struct lttng_consumer_stream **local_stream = NULL; | |
908 | /* local view of consumer_data.fds_count */ | |
909 | int nb_fd = 0; | |
910 | char tmp; | |
911 | int tmp2; | |
912 | struct lttng_consumer_local_data *ctx = data; | |
913 | ||
e7b994a3 DG |
914 | rcu_register_thread(); |
915 | ||
effcf122 | 916 | local_stream = zmalloc(sizeof(struct lttng_consumer_stream)); |
3bd1e081 MD |
917 | |
918 | while (1) { | |
919 | high_prio = 0; | |
920 | num_hup = 0; | |
921 | ||
922 | /* | |
e4421fec | 923 | * the fds set has been updated, we need to update our |
3bd1e081 MD |
924 | * local array as well |
925 | */ | |
926 | pthread_mutex_lock(&consumer_data.lock); | |
927 | if (consumer_data.need_update) { | |
928 | if (pollfd != NULL) { | |
929 | free(pollfd); | |
930 | pollfd = NULL; | |
931 | } | |
932 | if (local_stream != NULL) { | |
933 | free(local_stream); | |
934 | local_stream = NULL; | |
935 | } | |
936 | ||
937 | /* allocate for all fds + 1 for the consumer_poll_pipe */ | |
effcf122 | 938 | pollfd = zmalloc((consumer_data.stream_count + 1) * sizeof(struct pollfd)); |
3bd1e081 MD |
939 | if (pollfd == NULL) { |
940 | perror("pollfd malloc"); | |
941 | pthread_mutex_unlock(&consumer_data.lock); | |
942 | goto end; | |
943 | } | |
944 | ||
945 | /* allocate for all fds + 1 for the consumer_poll_pipe */ | |
effcf122 | 946 | local_stream = zmalloc((consumer_data.stream_count + 1) * |
3bd1e081 MD |
947 | sizeof(struct lttng_consumer_stream)); |
948 | if (local_stream == NULL) { | |
949 | perror("local_stream malloc"); | |
950 | pthread_mutex_unlock(&consumer_data.lock); | |
951 | goto end; | |
952 | } | |
953 | ret = consumer_update_poll_array(ctx, &pollfd, local_stream); | |
954 | if (ret < 0) { | |
955 | ERR("Error in allocating pollfd or local_outfds"); | |
956 | lttng_consumer_send_error(ctx, CONSUMERD_POLL_ERROR); | |
957 | pthread_mutex_unlock(&consumer_data.lock); | |
958 | goto end; | |
959 | } | |
960 | nb_fd = ret; | |
961 | consumer_data.need_update = 0; | |
962 | } | |
963 | pthread_mutex_unlock(&consumer_data.lock); | |
964 | ||
f5204c94 MD |
965 | /* No FDs and consumer_quit, consumer_cleanup the thread */ |
966 | if (nb_fd == 0 && consumer_quit == 1) { | |
967 | goto end; | |
968 | } | |
3bd1e081 | 969 | /* poll on the array of fds */ |
a8b0b341 | 970 | restart: |
3bd1e081 MD |
971 | DBG("polling on %d fd", nb_fd + 1); |
972 | num_rdy = poll(pollfd, nb_fd + 1, consumer_poll_timeout); | |
973 | DBG("poll num_rdy : %d", num_rdy); | |
974 | if (num_rdy == -1) { | |
a8b0b341 MD |
975 | /* |
976 | * Restart interrupted system call. | |
977 | */ | |
978 | if (errno == EINTR) { | |
979 | goto restart; | |
980 | } | |
3bd1e081 MD |
981 | perror("Poll error"); |
982 | lttng_consumer_send_error(ctx, CONSUMERD_POLL_ERROR); | |
983 | goto end; | |
984 | } else if (num_rdy == 0) { | |
985 | DBG("Polling thread timed out"); | |
986 | goto end; | |
987 | } | |
988 | ||
3bd1e081 MD |
989 | /* |
990 | * If the consumer_poll_pipe triggered poll go | |
991 | * directly to the beginning of the loop to update the | |
992 | * array. We want to prioritize array update over | |
993 | * low-priority reads. | |
994 | */ | |
d41f73b7 | 995 | if (pollfd[nb_fd].revents & POLLIN) { |
3bd1e081 MD |
996 | DBG("consumer_poll_pipe wake up"); |
997 | tmp2 = read(ctx->consumer_poll_pipe[0], &tmp, 1); | |
998 | if (tmp2 < 0) { | |
d41f73b7 | 999 | perror("read consumer poll"); |
3bd1e081 MD |
1000 | } |
1001 | continue; | |
1002 | } | |
1003 | ||
1004 | /* Take care of high priority channels first. */ | |
1005 | for (i = 0; i < nb_fd; i++) { | |
d41f73b7 | 1006 | if (pollfd[i].revents & POLLPRI) { |
f5204c94 MD |
1007 | ssize_t len; |
1008 | ||
d41f73b7 MD |
1009 | DBG("Urgent read on fd %d", pollfd[i].fd); |
1010 | high_prio = 1; | |
f5204c94 | 1011 | len = ctx->on_buffer_ready(local_stream[i], ctx); |
d41f73b7 | 1012 | /* it's ok to have an unavailable sub-buffer */ |
f5204c94 MD |
1013 | if (len < 0 && len != -EAGAIN) { |
1014 | goto end; | |
1015 | } else if (len > 0) { | |
1016 | local_stream[i]->data_read = 1; | |
d41f73b7 | 1017 | } |
3bd1e081 MD |
1018 | } |
1019 | } | |
1020 | ||
f5204c94 MD |
1021 | /* |
1022 | * If we read high prio channel in this loop, try again | |
1023 | * for more high prio data. | |
1024 | */ | |
1025 | if (high_prio) { | |
3bd1e081 MD |
1026 | continue; |
1027 | } | |
1028 | ||
1029 | /* Take care of low priority channels. */ | |
f5204c94 MD |
1030 | for (i = 0; i < nb_fd; i++) { |
1031 | if ((pollfd[i].revents & POLLIN) || | |
1032 | local_stream[i]->hangup_flush_done) { | |
1033 | ssize_t len; | |
1034 | ||
f5204c94 MD |
1035 | DBG("Normal read on fd %d", pollfd[i].fd); |
1036 | len = ctx->on_buffer_ready(local_stream[i], ctx); | |
1037 | /* it's ok to have an unavailable sub-buffer */ | |
1038 | if (len < 0 && len != -EAGAIN) { | |
1039 | goto end; | |
1040 | } else if (len > 0) { | |
1041 | local_stream[i]->data_read = 1; | |
1042 | } | |
1043 | } | |
1044 | } | |
1045 | ||
1046 | /* Handle hangup and errors */ | |
1047 | for (i = 0; i < nb_fd; i++) { | |
1048 | if (!local_stream[i]->hangup_flush_done | |
1049 | && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL)) | |
1050 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
1051 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
1052 | DBG("fd %d is hup|err|nval. Attempting flush and read.", | |
1053 | pollfd[i].fd); | |
1054 | lttng_ustconsumer_on_stream_hangup(local_stream[i]); | |
1055 | /* Attempt read again, for the data we just flushed. */ | |
1056 | local_stream[i]->data_read = 1; | |
1057 | } | |
1058 | /* | |
1059 | * If the poll flag is HUP/ERR/NVAL and we have | |
1060 | * read no data in this pass, we can remove the | |
1061 | * stream from its hash table. | |
1062 | */ | |
1063 | if ((pollfd[i].revents & POLLHUP)) { | |
1064 | DBG("Polling fd %d tells it has hung up.", pollfd[i].fd); | |
1065 | if (!local_stream[i]->data_read) { | |
702b1ea4 | 1066 | consumer_del_stream(local_stream[i]); |
f5204c94 MD |
1067 | num_hup++; |
1068 | } | |
1069 | } else if (pollfd[i].revents & POLLERR) { | |
1070 | ERR("Error returned in polling fd %d.", pollfd[i].fd); | |
1071 | if (!local_stream[i]->data_read) { | |
702b1ea4 | 1072 | consumer_del_stream(local_stream[i]); |
f5204c94 MD |
1073 | num_hup++; |
1074 | } | |
1075 | } else if (pollfd[i].revents & POLLNVAL) { | |
1076 | ERR("Polling fd %d tells fd is not open.", pollfd[i].fd); | |
1077 | if (!local_stream[i]->data_read) { | |
702b1ea4 | 1078 | consumer_del_stream(local_stream[i]); |
f5204c94 | 1079 | num_hup++; |
3bd1e081 MD |
1080 | } |
1081 | } | |
f5204c94 | 1082 | local_stream[i]->data_read = 0; |
3bd1e081 MD |
1083 | } |
1084 | } | |
1085 | end: | |
1086 | DBG("polling thread exiting"); | |
1087 | if (pollfd != NULL) { | |
1088 | free(pollfd); | |
1089 | pollfd = NULL; | |
1090 | } | |
1091 | if (local_stream != NULL) { | |
1092 | free(local_stream); | |
1093 | local_stream = NULL; | |
1094 | } | |
e7b994a3 | 1095 | rcu_unregister_thread(); |
3bd1e081 MD |
1096 | return NULL; |
1097 | } | |
1098 | ||
1099 | /* | |
1100 | * This thread listens on the consumerd socket and receives the file | |
1101 | * descriptors from the session daemon. | |
1102 | */ | |
1103 | void *lttng_consumer_thread_receive_fds(void *data) | |
1104 | { | |
1105 | int sock, client_socket, ret; | |
1106 | /* | |
1107 | * structure to poll for incoming data on communication socket avoids | |
1108 | * making blocking sockets. | |
1109 | */ | |
1110 | struct pollfd consumer_sockpoll[2]; | |
1111 | struct lttng_consumer_local_data *ctx = data; | |
1112 | ||
e7b994a3 DG |
1113 | rcu_register_thread(); |
1114 | ||
3bd1e081 MD |
1115 | DBG("Creating command socket %s", ctx->consumer_command_sock_path); |
1116 | unlink(ctx->consumer_command_sock_path); | |
1117 | client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path); | |
1118 | if (client_socket < 0) { | |
1119 | ERR("Cannot create command socket"); | |
1120 | goto end; | |
1121 | } | |
1122 | ||
1123 | ret = lttcomm_listen_unix_sock(client_socket); | |
1124 | if (ret < 0) { | |
1125 | goto end; | |
1126 | } | |
1127 | ||
32258573 | 1128 | DBG("Sending ready command to lttng-sessiond"); |
3bd1e081 MD |
1129 | ret = lttng_consumer_send_error(ctx, CONSUMERD_COMMAND_SOCK_READY); |
1130 | /* return < 0 on error, but == 0 is not fatal */ | |
1131 | if (ret < 0) { | |
32258573 | 1132 | ERR("Error sending ready command to lttng-sessiond"); |
3bd1e081 MD |
1133 | goto end; |
1134 | } | |
1135 | ||
1136 | ret = fcntl(client_socket, F_SETFL, O_NONBLOCK); | |
1137 | if (ret < 0) { | |
1138 | perror("fcntl O_NONBLOCK"); | |
1139 | goto end; | |
1140 | } | |
1141 | ||
1142 | /* prepare the FDs to poll : to client socket and the should_quit pipe */ | |
1143 | consumer_sockpoll[0].fd = ctx->consumer_should_quit[0]; | |
1144 | consumer_sockpoll[0].events = POLLIN | POLLPRI; | |
1145 | consumer_sockpoll[1].fd = client_socket; | |
1146 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
1147 | ||
1148 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
1149 | goto end; | |
1150 | } | |
1151 | DBG("Connection on client_socket"); | |
1152 | ||
1153 | /* Blocking call, waiting for transmission */ | |
1154 | sock = lttcomm_accept_unix_sock(client_socket); | |
1155 | if (sock <= 0) { | |
1156 | WARN("On accept"); | |
1157 | goto end; | |
1158 | } | |
1159 | ret = fcntl(sock, F_SETFL, O_NONBLOCK); | |
1160 | if (ret < 0) { | |
1161 | perror("fcntl O_NONBLOCK"); | |
1162 | goto end; | |
1163 | } | |
1164 | ||
1165 | /* update the polling structure to poll on the established socket */ | |
1166 | consumer_sockpoll[1].fd = sock; | |
1167 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
1168 | ||
1169 | while (1) { | |
1170 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
1171 | goto end; | |
1172 | } | |
1173 | DBG("Incoming command on sock"); | |
1174 | ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
1175 | if (ret == -ENOENT) { | |
1176 | DBG("Received STOP command"); | |
1177 | goto end; | |
1178 | } | |
1179 | if (ret < 0) { | |
1180 | ERR("Communication interrupted on command socket"); | |
1181 | goto end; | |
1182 | } | |
1183 | if (consumer_quit) { | |
1184 | DBG("consumer_thread_receive_fds received quit from signal"); | |
1185 | goto end; | |
1186 | } | |
1187 | DBG("received fds on sock"); | |
1188 | } | |
1189 | end: | |
1190 | DBG("consumer_thread_receive_fds exiting"); | |
1191 | ||
1192 | /* | |
1193 | * when all fds have hung up, the polling thread | |
1194 | * can exit cleanly | |
1195 | */ | |
1196 | consumer_quit = 1; | |
1197 | ||
1198 | /* | |
1199 | * 2s of grace period, if no polling events occur during | |
1200 | * this period, the polling thread will exit even if there | |
1201 | * are still open FDs (should not happen, but safety mechanism). | |
1202 | */ | |
1203 | consumer_poll_timeout = LTTNG_CONSUMER_POLL_TIMEOUT; | |
1204 | ||
1205 | /* wake up the polling thread */ | |
1206 | ret = write(ctx->consumer_poll_pipe[1], "4", 1); | |
1207 | if (ret < 0) { | |
1208 | perror("poll pipe write"); | |
1209 | } | |
e7b994a3 | 1210 | rcu_unregister_thread(); |
3bd1e081 MD |
1211 | return NULL; |
1212 | } | |
d41f73b7 | 1213 | |
f5204c94 | 1214 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
1215 | struct lttng_consumer_local_data *ctx) |
1216 | { | |
1217 | switch (consumer_data.type) { | |
1218 | case LTTNG_CONSUMER_KERNEL: | |
1219 | return lttng_kconsumer_read_subbuffer(stream, ctx); | |
7753dea8 MD |
1220 | case LTTNG_CONSUMER32_UST: |
1221 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
1222 | return lttng_ustconsumer_read_subbuffer(stream, ctx); |
1223 | default: | |
1224 | ERR("Unknown consumer_data type"); | |
1225 | assert(0); | |
1226 | return -ENOSYS; | |
1227 | } | |
1228 | } | |
1229 | ||
1230 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
1231 | { | |
1232 | switch (consumer_data.type) { | |
1233 | case LTTNG_CONSUMER_KERNEL: | |
1234 | return lttng_kconsumer_on_recv_stream(stream); | |
7753dea8 MD |
1235 | case LTTNG_CONSUMER32_UST: |
1236 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
1237 | return lttng_ustconsumer_on_recv_stream(stream); |
1238 | default: | |
1239 | ERR("Unknown consumer_data type"); | |
1240 | assert(0); | |
1241 | return -ENOSYS; | |
1242 | } | |
1243 | } | |
e4421fec DG |
1244 | |
1245 | /* | |
1246 | * Allocate and set consumer data hash tables. | |
1247 | */ | |
1248 | void lttng_consumer_init(void) | |
1249 | { | |
1250 | consumer_data.stream_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
1251 | consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
1252 | } | |
1253 |