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> | |
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 DG |
32 | #include <common/kernel-ctl/kernel-ctl.h> |
33 | #include <common/sessiond-comm/sessiond-comm.h> | |
34 | #include <common/kernel-consumer/kernel-consumer.h> | |
35 | #include <common/ust-consumer/ust-consumer.h> | |
36 | ||
37 | #include "consumer.h" | |
3bd1e081 MD |
38 | |
39 | struct lttng_consumer_global_data consumer_data = { | |
3bd1e081 MD |
40 | .stream_count = 0, |
41 | .need_update = 1, | |
42 | .type = LTTNG_CONSUMER_UNKNOWN, | |
43 | }; | |
44 | ||
45 | /* timeout parameter, to control the polling thread grace period. */ | |
46 | int consumer_poll_timeout = -1; | |
47 | ||
48 | /* | |
49 | * Flag to inform the polling thread to quit when all fd hung up. Updated by | |
50 | * the consumer_thread_receive_fds when it notices that all fds has hung up. | |
51 | * Also updated by the signal handler (consumer_should_exit()). Read by the | |
52 | * polling threads. | |
53 | */ | |
54 | volatile int consumer_quit = 0; | |
55 | ||
56 | /* | |
57 | * Find a stream. The consumer_data.lock must be locked during this | |
58 | * call. | |
59 | */ | |
60 | static struct lttng_consumer_stream *consumer_find_stream(int key) | |
61 | { | |
e4421fec DG |
62 | struct lttng_ht_iter iter; |
63 | struct lttng_ht_node_ulong *node; | |
64 | struct lttng_consumer_stream *stream = NULL; | |
3bd1e081 | 65 | |
7ad0a0cb MD |
66 | /* Negative keys are lookup failures */ |
67 | if (key < 0) | |
68 | return NULL; | |
e4421fec | 69 | |
6065ceec DG |
70 | rcu_read_lock(); |
71 | ||
e4421fec DG |
72 | lttng_ht_lookup(consumer_data.stream_ht, (void *)((unsigned long) key), |
73 | &iter); | |
74 | node = lttng_ht_iter_get_node_ulong(&iter); | |
75 | if (node != NULL) { | |
76 | stream = caa_container_of(node, struct lttng_consumer_stream, node); | |
3bd1e081 | 77 | } |
e4421fec | 78 | |
6065ceec DG |
79 | rcu_read_unlock(); |
80 | ||
e4421fec | 81 | return stream; |
3bd1e081 MD |
82 | } |
83 | ||
7ad0a0cb MD |
84 | static void consumer_steal_stream_key(int key) |
85 | { | |
86 | struct lttng_consumer_stream *stream; | |
87 | ||
04253271 | 88 | rcu_read_lock(); |
7ad0a0cb | 89 | stream = consumer_find_stream(key); |
04253271 | 90 | if (stream) { |
7ad0a0cb | 91 | stream->key = -1; |
04253271 MD |
92 | /* |
93 | * We don't want the lookup to match, but we still need | |
94 | * to iterate on this stream when iterating over the hash table. Just | |
95 | * change the node key. | |
96 | */ | |
97 | stream->node.key = -1; | |
98 | } | |
99 | rcu_read_unlock(); | |
7ad0a0cb MD |
100 | } |
101 | ||
3bd1e081 MD |
102 | static struct lttng_consumer_channel *consumer_find_channel(int key) |
103 | { | |
e4421fec DG |
104 | struct lttng_ht_iter iter; |
105 | struct lttng_ht_node_ulong *node; | |
106 | struct lttng_consumer_channel *channel = NULL; | |
3bd1e081 | 107 | |
7ad0a0cb MD |
108 | /* Negative keys are lookup failures */ |
109 | if (key < 0) | |
110 | return NULL; | |
e4421fec | 111 | |
6065ceec DG |
112 | rcu_read_lock(); |
113 | ||
e4421fec DG |
114 | lttng_ht_lookup(consumer_data.channel_ht, (void *)((unsigned long) key), |
115 | &iter); | |
116 | node = lttng_ht_iter_get_node_ulong(&iter); | |
117 | if (node != NULL) { | |
118 | channel = caa_container_of(node, struct lttng_consumer_channel, node); | |
3bd1e081 | 119 | } |
e4421fec | 120 | |
6065ceec DG |
121 | rcu_read_unlock(); |
122 | ||
e4421fec | 123 | return channel; |
3bd1e081 MD |
124 | } |
125 | ||
7ad0a0cb MD |
126 | static void consumer_steal_channel_key(int key) |
127 | { | |
128 | struct lttng_consumer_channel *channel; | |
129 | ||
04253271 | 130 | rcu_read_lock(); |
7ad0a0cb | 131 | channel = consumer_find_channel(key); |
04253271 | 132 | if (channel) { |
7ad0a0cb | 133 | channel->key = -1; |
04253271 MD |
134 | /* |
135 | * We don't want the lookup to match, but we still need | |
136 | * to iterate on this channel when iterating over the hash table. Just | |
137 | * change the node key. | |
138 | */ | |
139 | channel->node.key = -1; | |
140 | } | |
141 | rcu_read_unlock(); | |
7ad0a0cb MD |
142 | } |
143 | ||
702b1ea4 MD |
144 | static |
145 | void consumer_free_stream(struct rcu_head *head) | |
146 | { | |
147 | struct lttng_ht_node_ulong *node = | |
148 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
149 | struct lttng_consumer_stream *stream = | |
150 | caa_container_of(node, struct lttng_consumer_stream, node); | |
151 | ||
152 | free(stream); | |
153 | } | |
154 | ||
3bd1e081 MD |
155 | /* |
156 | * Remove a stream from the global list protected by a mutex. This | |
157 | * function is also responsible for freeing its data structures. | |
158 | */ | |
159 | void consumer_del_stream(struct lttng_consumer_stream *stream) | |
160 | { | |
161 | int ret; | |
e4421fec | 162 | struct lttng_ht_iter iter; |
3bd1e081 MD |
163 | struct lttng_consumer_channel *free_chan = NULL; |
164 | ||
165 | pthread_mutex_lock(&consumer_data.lock); | |
166 | ||
167 | switch (consumer_data.type) { | |
168 | case LTTNG_CONSUMER_KERNEL: | |
169 | if (stream->mmap_base != NULL) { | |
170 | ret = munmap(stream->mmap_base, stream->mmap_len); | |
171 | if (ret != 0) { | |
172 | perror("munmap"); | |
173 | } | |
174 | } | |
175 | break; | |
7753dea8 MD |
176 | case LTTNG_CONSUMER32_UST: |
177 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
178 | lttng_ustconsumer_del_stream(stream); |
179 | break; | |
180 | default: | |
181 | ERR("Unknown consumer_data type"); | |
182 | assert(0); | |
183 | goto end; | |
184 | } | |
185 | ||
6065ceec | 186 | rcu_read_lock(); |
04253271 MD |
187 | iter.iter.node = &stream->node.node; |
188 | ret = lttng_ht_del(consumer_data.stream_ht, &iter); | |
189 | assert(!ret); | |
e4421fec | 190 | |
6065ceec DG |
191 | rcu_read_unlock(); |
192 | ||
3bd1e081 MD |
193 | if (consumer_data.stream_count <= 0) { |
194 | goto end; | |
195 | } | |
196 | consumer_data.stream_count--; | |
197 | if (!stream) { | |
198 | goto end; | |
199 | } | |
200 | if (stream->out_fd >= 0) { | |
4c462e79 MD |
201 | ret = close(stream->out_fd); |
202 | if (ret) { | |
203 | PERROR("close"); | |
204 | } | |
3bd1e081 | 205 | } |
b5c5fc29 | 206 | if (stream->wait_fd >= 0 && !stream->wait_fd_is_copy) { |
4c462e79 MD |
207 | ret = close(stream->wait_fd); |
208 | if (ret) { | |
209 | PERROR("close"); | |
210 | } | |
3bd1e081 | 211 | } |
2c1dd183 | 212 | if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) { |
4c462e79 MD |
213 | ret = close(stream->shm_fd); |
214 | if (ret) { | |
215 | PERROR("close"); | |
216 | } | |
3bd1e081 MD |
217 | } |
218 | if (!--stream->chan->refcount) | |
219 | free_chan = stream->chan; | |
702b1ea4 MD |
220 | |
221 | call_rcu(&stream->node.head, consumer_free_stream); | |
3bd1e081 MD |
222 | end: |
223 | consumer_data.need_update = 1; | |
224 | pthread_mutex_unlock(&consumer_data.lock); | |
225 | ||
226 | if (free_chan) | |
227 | consumer_del_channel(free_chan); | |
228 | } | |
229 | ||
230 | struct lttng_consumer_stream *consumer_allocate_stream( | |
231 | int channel_key, int stream_key, | |
232 | int shm_fd, int wait_fd, | |
233 | enum lttng_consumer_stream_state state, | |
234 | uint64_t mmap_len, | |
235 | enum lttng_event_output output, | |
6df2e2c9 MD |
236 | const char *path_name, |
237 | uid_t uid, | |
238 | gid_t gid) | |
3bd1e081 MD |
239 | { |
240 | struct lttng_consumer_stream *stream; | |
241 | int ret; | |
242 | ||
effcf122 | 243 | stream = zmalloc(sizeof(*stream)); |
3bd1e081 MD |
244 | if (stream == NULL) { |
245 | perror("malloc struct lttng_consumer_stream"); | |
246 | goto end; | |
247 | } | |
248 | stream->chan = consumer_find_channel(channel_key); | |
249 | if (!stream->chan) { | |
250 | perror("Unable to find channel key"); | |
251 | goto end; | |
252 | } | |
253 | stream->chan->refcount++; | |
254 | stream->key = stream_key; | |
255 | stream->shm_fd = shm_fd; | |
256 | stream->wait_fd = wait_fd; | |
257 | stream->out_fd = -1; | |
258 | stream->out_fd_offset = 0; | |
259 | stream->state = state; | |
260 | stream->mmap_len = mmap_len; | |
261 | stream->mmap_base = NULL; | |
262 | stream->output = output; | |
6df2e2c9 MD |
263 | stream->uid = uid; |
264 | stream->gid = gid; | |
3bd1e081 MD |
265 | strncpy(stream->path_name, path_name, PATH_MAX - 1); |
266 | stream->path_name[PATH_MAX - 1] = '\0'; | |
e4421fec | 267 | lttng_ht_node_init_ulong(&stream->node, stream->key); |
3bd1e081 MD |
268 | |
269 | switch (consumer_data.type) { | |
270 | case LTTNG_CONSUMER_KERNEL: | |
271 | break; | |
7753dea8 MD |
272 | case LTTNG_CONSUMER32_UST: |
273 | case LTTNG_CONSUMER64_UST: | |
5af2f756 | 274 | stream->cpu = stream->chan->cpucount++; |
3bd1e081 MD |
275 | ret = lttng_ustconsumer_allocate_stream(stream); |
276 | if (ret) { | |
277 | free(stream); | |
278 | return NULL; | |
279 | } | |
280 | break; | |
281 | default: | |
282 | ERR("Unknown consumer_data type"); | |
283 | assert(0); | |
284 | goto end; | |
285 | } | |
286 | DBG("Allocated stream %s (key %d, shm_fd %d, wait_fd %d, mmap_len %llu, out_fd %d)", | |
287 | stream->path_name, stream->key, | |
288 | stream->shm_fd, | |
289 | stream->wait_fd, | |
290 | (unsigned long long) stream->mmap_len, | |
291 | stream->out_fd); | |
292 | end: | |
293 | return stream; | |
294 | } | |
295 | ||
296 | /* | |
297 | * Add a stream to the global list protected by a mutex. | |
298 | */ | |
299 | int consumer_add_stream(struct lttng_consumer_stream *stream) | |
300 | { | |
301 | int ret = 0; | |
302 | ||
303 | pthread_mutex_lock(&consumer_data.lock); | |
7ad0a0cb MD |
304 | /* Steal stream identifier, for UST */ |
305 | consumer_steal_stream_key(stream->key); | |
6065ceec | 306 | rcu_read_lock(); |
04253271 | 307 | lttng_ht_add_unique_ulong(consumer_data.stream_ht, &stream->node); |
6065ceec | 308 | rcu_read_unlock(); |
3bd1e081 MD |
309 | consumer_data.stream_count++; |
310 | consumer_data.need_update = 1; | |
311 | ||
312 | switch (consumer_data.type) { | |
313 | case LTTNG_CONSUMER_KERNEL: | |
314 | break; | |
7753dea8 MD |
315 | case LTTNG_CONSUMER32_UST: |
316 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
317 | /* Streams are in CPU number order (we rely on this) */ |
318 | stream->cpu = stream->chan->nr_streams++; | |
319 | break; | |
320 | default: | |
321 | ERR("Unknown consumer_data type"); | |
322 | assert(0); | |
323 | goto end; | |
324 | } | |
325 | ||
326 | end: | |
327 | pthread_mutex_unlock(&consumer_data.lock); | |
702b1ea4 | 328 | |
3bd1e081 MD |
329 | return ret; |
330 | } | |
331 | ||
332 | /* | |
333 | * Update a stream according to what we just received. | |
334 | */ | |
335 | void consumer_change_stream_state(int stream_key, | |
336 | enum lttng_consumer_stream_state state) | |
337 | { | |
338 | struct lttng_consumer_stream *stream; | |
339 | ||
340 | pthread_mutex_lock(&consumer_data.lock); | |
341 | stream = consumer_find_stream(stream_key); | |
342 | if (stream) { | |
343 | stream->state = state; | |
344 | } | |
345 | consumer_data.need_update = 1; | |
346 | pthread_mutex_unlock(&consumer_data.lock); | |
347 | } | |
348 | ||
702b1ea4 MD |
349 | static |
350 | void consumer_free_channel(struct rcu_head *head) | |
351 | { | |
352 | struct lttng_ht_node_ulong *node = | |
353 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
354 | struct lttng_consumer_channel *channel = | |
355 | caa_container_of(node, struct lttng_consumer_channel, node); | |
356 | ||
357 | free(channel); | |
358 | } | |
359 | ||
3bd1e081 MD |
360 | /* |
361 | * Remove a channel from the global list protected by a mutex. This | |
362 | * function is also responsible for freeing its data structures. | |
363 | */ | |
364 | void consumer_del_channel(struct lttng_consumer_channel *channel) | |
365 | { | |
366 | int ret; | |
e4421fec | 367 | struct lttng_ht_iter iter; |
3bd1e081 MD |
368 | |
369 | pthread_mutex_lock(&consumer_data.lock); | |
370 | ||
371 | switch (consumer_data.type) { | |
372 | case LTTNG_CONSUMER_KERNEL: | |
373 | break; | |
7753dea8 MD |
374 | case LTTNG_CONSUMER32_UST: |
375 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
376 | lttng_ustconsumer_del_channel(channel); |
377 | break; | |
378 | default: | |
379 | ERR("Unknown consumer_data type"); | |
380 | assert(0); | |
381 | goto end; | |
382 | } | |
383 | ||
6065ceec | 384 | rcu_read_lock(); |
04253271 MD |
385 | iter.iter.node = &channel->node.node; |
386 | ret = lttng_ht_del(consumer_data.channel_ht, &iter); | |
387 | assert(!ret); | |
6065ceec DG |
388 | rcu_read_unlock(); |
389 | ||
3bd1e081 MD |
390 | if (channel->mmap_base != NULL) { |
391 | ret = munmap(channel->mmap_base, channel->mmap_len); | |
392 | if (ret != 0) { | |
393 | perror("munmap"); | |
394 | } | |
395 | } | |
b5c5fc29 | 396 | if (channel->wait_fd >= 0 && !channel->wait_fd_is_copy) { |
4c462e79 MD |
397 | ret = close(channel->wait_fd); |
398 | if (ret) { | |
399 | PERROR("close"); | |
400 | } | |
3bd1e081 | 401 | } |
2c1dd183 | 402 | if (channel->shm_fd >= 0 && channel->wait_fd != channel->shm_fd) { |
4c462e79 MD |
403 | ret = close(channel->shm_fd); |
404 | if (ret) { | |
405 | PERROR("close"); | |
406 | } | |
3bd1e081 | 407 | } |
702b1ea4 MD |
408 | |
409 | call_rcu(&channel->node.head, consumer_free_channel); | |
3bd1e081 MD |
410 | end: |
411 | pthread_mutex_unlock(&consumer_data.lock); | |
412 | } | |
413 | ||
414 | struct lttng_consumer_channel *consumer_allocate_channel( | |
415 | int channel_key, | |
416 | int shm_fd, int wait_fd, | |
417 | uint64_t mmap_len, | |
418 | uint64_t max_sb_size) | |
419 | { | |
420 | struct lttng_consumer_channel *channel; | |
421 | int ret; | |
422 | ||
276b26d1 | 423 | channel = zmalloc(sizeof(*channel)); |
3bd1e081 MD |
424 | if (channel == NULL) { |
425 | perror("malloc struct lttng_consumer_channel"); | |
426 | goto end; | |
427 | } | |
428 | channel->key = channel_key; | |
429 | channel->shm_fd = shm_fd; | |
430 | channel->wait_fd = wait_fd; | |
431 | channel->mmap_len = mmap_len; | |
432 | channel->max_sb_size = max_sb_size; | |
433 | channel->refcount = 0; | |
434 | channel->nr_streams = 0; | |
e4421fec | 435 | lttng_ht_node_init_ulong(&channel->node, channel->key); |
3bd1e081 MD |
436 | |
437 | switch (consumer_data.type) { | |
438 | case LTTNG_CONSUMER_KERNEL: | |
439 | channel->mmap_base = NULL; | |
440 | channel->mmap_len = 0; | |
441 | break; | |
7753dea8 MD |
442 | case LTTNG_CONSUMER32_UST: |
443 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
444 | ret = lttng_ustconsumer_allocate_channel(channel); |
445 | if (ret) { | |
446 | free(channel); | |
447 | return NULL; | |
448 | } | |
449 | break; | |
450 | default: | |
451 | ERR("Unknown consumer_data type"); | |
452 | assert(0); | |
453 | goto end; | |
454 | } | |
455 | DBG("Allocated channel (key %d, shm_fd %d, wait_fd %d, mmap_len %llu, max_sb_size %llu)", | |
456 | channel->key, | |
457 | channel->shm_fd, | |
458 | channel->wait_fd, | |
459 | (unsigned long long) channel->mmap_len, | |
460 | (unsigned long long) channel->max_sb_size); | |
461 | end: | |
462 | return channel; | |
463 | } | |
464 | ||
465 | /* | |
466 | * Add a channel to the global list protected by a mutex. | |
467 | */ | |
468 | int consumer_add_channel(struct lttng_consumer_channel *channel) | |
469 | { | |
3bd1e081 | 470 | pthread_mutex_lock(&consumer_data.lock); |
7ad0a0cb MD |
471 | /* Steal channel identifier, for UST */ |
472 | consumer_steal_channel_key(channel->key); | |
6065ceec | 473 | rcu_read_lock(); |
04253271 | 474 | lttng_ht_add_unique_ulong(consumer_data.channel_ht, &channel->node); |
6065ceec | 475 | rcu_read_unlock(); |
3bd1e081 | 476 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 477 | |
7ad0a0cb | 478 | return 0; |
3bd1e081 MD |
479 | } |
480 | ||
481 | /* | |
482 | * Allocate the pollfd structure and the local view of the out fds to avoid | |
483 | * doing a lookup in the linked list and concurrency issues when writing is | |
484 | * needed. Called with consumer_data.lock held. | |
485 | * | |
486 | * Returns the number of fds in the structures. | |
487 | */ | |
488 | int consumer_update_poll_array( | |
489 | struct lttng_consumer_local_data *ctx, struct pollfd **pollfd, | |
490 | struct lttng_consumer_stream **local_stream) | |
491 | { | |
3bd1e081 | 492 | int i = 0; |
e4421fec DG |
493 | struct lttng_ht_iter iter; |
494 | struct lttng_consumer_stream *stream; | |
3bd1e081 MD |
495 | |
496 | DBG("Updating poll fd array"); | |
481d6c57 | 497 | rcu_read_lock(); |
e4421fec DG |
498 | cds_lfht_for_each_entry(consumer_data.stream_ht->ht, &iter.iter, stream, |
499 | node.node) { | |
500 | if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM) { | |
3bd1e081 MD |
501 | continue; |
502 | } | |
e4421fec DG |
503 | DBG("Active FD %d", stream->wait_fd); |
504 | (*pollfd)[i].fd = stream->wait_fd; | |
3bd1e081 | 505 | (*pollfd)[i].events = POLLIN | POLLPRI; |
e4421fec | 506 | local_stream[i] = stream; |
3bd1e081 MD |
507 | i++; |
508 | } | |
481d6c57 | 509 | rcu_read_unlock(); |
3bd1e081 MD |
510 | |
511 | /* | |
512 | * Insert the consumer_poll_pipe at the end of the array and don't | |
513 | * increment i so nb_fd is the number of real FD. | |
514 | */ | |
515 | (*pollfd)[i].fd = ctx->consumer_poll_pipe[0]; | |
516 | (*pollfd)[i].events = POLLIN; | |
517 | return i; | |
518 | } | |
519 | ||
520 | /* | |
521 | * Poll on the should_quit pipe and the command socket return -1 on error and | |
522 | * should exit, 0 if data is available on the command socket | |
523 | */ | |
524 | int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll) | |
525 | { | |
526 | int num_rdy; | |
527 | ||
88f2b785 | 528 | restart: |
3bd1e081 MD |
529 | num_rdy = poll(consumer_sockpoll, 2, -1); |
530 | if (num_rdy == -1) { | |
88f2b785 MD |
531 | /* |
532 | * Restart interrupted system call. | |
533 | */ | |
534 | if (errno == EINTR) { | |
535 | goto restart; | |
536 | } | |
3bd1e081 MD |
537 | perror("Poll error"); |
538 | goto exit; | |
539 | } | |
540 | if (consumer_sockpoll[0].revents == POLLIN) { | |
541 | DBG("consumer_should_quit wake up"); | |
542 | goto exit; | |
543 | } | |
544 | return 0; | |
545 | ||
546 | exit: | |
547 | return -1; | |
548 | } | |
549 | ||
550 | /* | |
551 | * Set the error socket. | |
552 | */ | |
553 | void lttng_consumer_set_error_sock( | |
554 | struct lttng_consumer_local_data *ctx, int sock) | |
555 | { | |
556 | ctx->consumer_error_socket = sock; | |
557 | } | |
558 | ||
559 | /* | |
560 | * Set the command socket path. | |
561 | */ | |
562 | ||
563 | void lttng_consumer_set_command_sock_path( | |
564 | struct lttng_consumer_local_data *ctx, char *sock) | |
565 | { | |
566 | ctx->consumer_command_sock_path = sock; | |
567 | } | |
568 | ||
569 | /* | |
570 | * Send return code to the session daemon. | |
571 | * If the socket is not defined, we return 0, it is not a fatal error | |
572 | */ | |
573 | int lttng_consumer_send_error( | |
574 | struct lttng_consumer_local_data *ctx, int cmd) | |
575 | { | |
576 | if (ctx->consumer_error_socket > 0) { | |
577 | return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd, | |
578 | sizeof(enum lttcomm_sessiond_command)); | |
579 | } | |
580 | ||
581 | return 0; | |
582 | } | |
583 | ||
584 | /* | |
585 | * Close all the tracefiles and stream fds, should be called when all instances | |
586 | * are destroyed. | |
587 | */ | |
588 | void lttng_consumer_cleanup(void) | |
589 | { | |
e4421fec | 590 | struct lttng_ht_iter iter; |
6065ceec DG |
591 | struct lttng_ht_node_ulong *node; |
592 | ||
593 | rcu_read_lock(); | |
3bd1e081 MD |
594 | |
595 | /* | |
6065ceec DG |
596 | * close all outfd. Called when there are no more threads running (after |
597 | * joining on the threads), no need to protect list iteration with mutex. | |
3bd1e081 | 598 | */ |
6065ceec DG |
599 | cds_lfht_for_each_entry(consumer_data.stream_ht->ht, &iter.iter, node, |
600 | node) { | |
702b1ea4 MD |
601 | struct lttng_consumer_stream *stream = |
602 | caa_container_of(node, struct lttng_consumer_stream, node); | |
603 | consumer_del_stream(stream); | |
3bd1e081 | 604 | } |
e4421fec | 605 | |
6065ceec DG |
606 | cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, node, |
607 | node) { | |
702b1ea4 MD |
608 | struct lttng_consumer_channel *channel = |
609 | caa_container_of(node, struct lttng_consumer_channel, node); | |
610 | consumer_del_channel(channel); | |
3bd1e081 | 611 | } |
6065ceec DG |
612 | |
613 | rcu_read_unlock(); | |
3bd1e081 MD |
614 | } |
615 | ||
616 | /* | |
617 | * Called from signal handler. | |
618 | */ | |
619 | void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx) | |
620 | { | |
621 | int ret; | |
622 | consumer_quit = 1; | |
623 | ret = write(ctx->consumer_should_quit[1], "4", 1); | |
624 | if (ret < 0) { | |
625 | perror("write consumer quit"); | |
626 | } | |
627 | } | |
628 | ||
629 | void lttng_consumer_sync_trace_file( | |
630 | struct lttng_consumer_stream *stream, off_t orig_offset) | |
631 | { | |
632 | int outfd = stream->out_fd; | |
633 | ||
634 | /* | |
635 | * This does a blocking write-and-wait on any page that belongs to the | |
636 | * subbuffer prior to the one we just wrote. | |
637 | * Don't care about error values, as these are just hints and ways to | |
638 | * limit the amount of page cache used. | |
639 | */ | |
640 | if (orig_offset < stream->chan->max_sb_size) { | |
641 | return; | |
642 | } | |
b9182dd9 | 643 | lttng_sync_file_range(outfd, orig_offset - stream->chan->max_sb_size, |
3bd1e081 MD |
644 | stream->chan->max_sb_size, |
645 | SYNC_FILE_RANGE_WAIT_BEFORE | |
646 | | SYNC_FILE_RANGE_WRITE | |
647 | | SYNC_FILE_RANGE_WAIT_AFTER); | |
648 | /* | |
649 | * Give hints to the kernel about how we access the file: | |
650 | * POSIX_FADV_DONTNEED : we won't re-access data in a near future after | |
651 | * we write it. | |
652 | * | |
653 | * We need to call fadvise again after the file grows because the | |
654 | * kernel does not seem to apply fadvise to non-existing parts of the | |
655 | * file. | |
656 | * | |
657 | * Call fadvise _after_ having waited for the page writeback to | |
658 | * complete because the dirty page writeback semantic is not well | |
659 | * defined. So it can be expected to lead to lower throughput in | |
660 | * streaming. | |
661 | */ | |
662 | posix_fadvise(outfd, orig_offset - stream->chan->max_sb_size, | |
663 | stream->chan->max_sb_size, POSIX_FADV_DONTNEED); | |
664 | } | |
665 | ||
666 | /* | |
667 | * Initialise the necessary environnement : | |
668 | * - create a new context | |
669 | * - create the poll_pipe | |
670 | * - create the should_quit pipe (for signal handler) | |
671 | * - create the thread pipe (for splice) | |
672 | * | |
673 | * Takes a function pointer as argument, this function is called when data is | |
674 | * available on a buffer. This function is responsible to do the | |
675 | * kernctl_get_next_subbuf, read the data with mmap or splice depending on the | |
676 | * buffer configuration and then kernctl_put_next_subbuf at the end. | |
677 | * | |
678 | * Returns a pointer to the new context or NULL on error. | |
679 | */ | |
680 | struct lttng_consumer_local_data *lttng_consumer_create( | |
681 | enum lttng_consumer_type type, | |
4078b776 | 682 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
d41f73b7 | 683 | struct lttng_consumer_local_data *ctx), |
3bd1e081 MD |
684 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
685 | int (*recv_stream)(struct lttng_consumer_stream *stream), | |
686 | int (*update_stream)(int stream_key, uint32_t state)) | |
687 | { | |
688 | int ret, i; | |
689 | struct lttng_consumer_local_data *ctx; | |
690 | ||
691 | assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN || | |
692 | consumer_data.type == type); | |
693 | consumer_data.type = type; | |
694 | ||
effcf122 | 695 | ctx = zmalloc(sizeof(struct lttng_consumer_local_data)); |
3bd1e081 MD |
696 | if (ctx == NULL) { |
697 | perror("allocating context"); | |
698 | goto error; | |
699 | } | |
700 | ||
701 | ctx->consumer_error_socket = -1; | |
702 | /* assign the callbacks */ | |
703 | ctx->on_buffer_ready = buffer_ready; | |
704 | ctx->on_recv_channel = recv_channel; | |
705 | ctx->on_recv_stream = recv_stream; | |
706 | ctx->on_update_stream = update_stream; | |
707 | ||
708 | ret = pipe(ctx->consumer_poll_pipe); | |
709 | if (ret < 0) { | |
710 | perror("Error creating poll pipe"); | |
711 | goto error_poll_pipe; | |
712 | } | |
713 | ||
714 | ret = pipe(ctx->consumer_should_quit); | |
715 | if (ret < 0) { | |
716 | perror("Error creating recv pipe"); | |
717 | goto error_quit_pipe; | |
718 | } | |
719 | ||
720 | ret = pipe(ctx->consumer_thread_pipe); | |
721 | if (ret < 0) { | |
722 | perror("Error creating thread pipe"); | |
723 | goto error_thread_pipe; | |
724 | } | |
725 | ||
726 | return ctx; | |
727 | ||
728 | ||
729 | error_thread_pipe: | |
730 | for (i = 0; i < 2; i++) { | |
731 | int err; | |
732 | ||
733 | err = close(ctx->consumer_should_quit[i]); | |
4c462e79 MD |
734 | if (err) { |
735 | PERROR("close"); | |
736 | } | |
3bd1e081 MD |
737 | } |
738 | error_quit_pipe: | |
739 | for (i = 0; i < 2; i++) { | |
740 | int err; | |
741 | ||
742 | err = close(ctx->consumer_poll_pipe[i]); | |
4c462e79 MD |
743 | if (err) { |
744 | PERROR("close"); | |
745 | } | |
3bd1e081 MD |
746 | } |
747 | error_poll_pipe: | |
748 | free(ctx); | |
749 | error: | |
750 | return NULL; | |
751 | } | |
752 | ||
753 | /* | |
754 | * Close all fds associated with the instance and free the context. | |
755 | */ | |
756 | void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx) | |
757 | { | |
4c462e79 MD |
758 | int ret; |
759 | ||
760 | ret = close(ctx->consumer_error_socket); | |
761 | if (ret) { | |
762 | PERROR("close"); | |
763 | } | |
764 | ret = close(ctx->consumer_thread_pipe[0]); | |
765 | if (ret) { | |
766 | PERROR("close"); | |
767 | } | |
768 | ret = close(ctx->consumer_thread_pipe[1]); | |
769 | if (ret) { | |
770 | PERROR("close"); | |
771 | } | |
772 | ret = close(ctx->consumer_poll_pipe[0]); | |
773 | if (ret) { | |
774 | PERROR("close"); | |
775 | } | |
776 | ret = close(ctx->consumer_poll_pipe[1]); | |
777 | if (ret) { | |
778 | PERROR("close"); | |
779 | } | |
780 | ret = close(ctx->consumer_should_quit[0]); | |
781 | if (ret) { | |
782 | PERROR("close"); | |
783 | } | |
784 | ret = close(ctx->consumer_should_quit[1]); | |
785 | if (ret) { | |
786 | PERROR("close"); | |
787 | } | |
3bd1e081 MD |
788 | unlink(ctx->consumer_command_sock_path); |
789 | free(ctx); | |
790 | } | |
791 | ||
792 | /* | |
793 | * Mmap the ring buffer, read it and write the data to the tracefile. | |
794 | * | |
795 | * Returns the number of bytes written | |
796 | */ | |
4078b776 | 797 | ssize_t lttng_consumer_on_read_subbuffer_mmap( |
3bd1e081 MD |
798 | struct lttng_consumer_local_data *ctx, |
799 | struct lttng_consumer_stream *stream, unsigned long len) | |
800 | { | |
801 | switch (consumer_data.type) { | |
802 | case LTTNG_CONSUMER_KERNEL: | |
803 | return lttng_kconsumer_on_read_subbuffer_mmap(ctx, stream, len); | |
7753dea8 MD |
804 | case LTTNG_CONSUMER32_UST: |
805 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
806 | return lttng_ustconsumer_on_read_subbuffer_mmap(ctx, stream, len); |
807 | default: | |
808 | ERR("Unknown consumer_data type"); | |
809 | assert(0); | |
810 | } | |
b9182dd9 DG |
811 | |
812 | return 0; | |
3bd1e081 MD |
813 | } |
814 | ||
815 | /* | |
816 | * Splice the data from the ring buffer to the tracefile. | |
817 | * | |
818 | * Returns the number of bytes spliced. | |
819 | */ | |
4078b776 | 820 | ssize_t lttng_consumer_on_read_subbuffer_splice( |
3bd1e081 MD |
821 | struct lttng_consumer_local_data *ctx, |
822 | struct lttng_consumer_stream *stream, unsigned long len) | |
823 | { | |
824 | switch (consumer_data.type) { | |
825 | case LTTNG_CONSUMER_KERNEL: | |
826 | return lttng_kconsumer_on_read_subbuffer_splice(ctx, stream, len); | |
7753dea8 MD |
827 | case LTTNG_CONSUMER32_UST: |
828 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
829 | return -ENOSYS; |
830 | default: | |
831 | ERR("Unknown consumer_data type"); | |
832 | assert(0); | |
833 | return -ENOSYS; | |
834 | } | |
835 | ||
836 | } | |
837 | ||
838 | /* | |
839 | * Take a snapshot for a specific fd | |
840 | * | |
841 | * Returns 0 on success, < 0 on error | |
842 | */ | |
843 | int lttng_consumer_take_snapshot(struct lttng_consumer_local_data *ctx, | |
844 | struct lttng_consumer_stream *stream) | |
845 | { | |
846 | switch (consumer_data.type) { | |
847 | case LTTNG_CONSUMER_KERNEL: | |
848 | return lttng_kconsumer_take_snapshot(ctx, stream); | |
7753dea8 MD |
849 | case LTTNG_CONSUMER32_UST: |
850 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
851 | return lttng_ustconsumer_take_snapshot(ctx, stream); |
852 | default: | |
853 | ERR("Unknown consumer_data type"); | |
854 | assert(0); | |
855 | return -ENOSYS; | |
856 | } | |
857 | ||
858 | } | |
859 | ||
860 | /* | |
861 | * Get the produced position | |
862 | * | |
863 | * Returns 0 on success, < 0 on error | |
864 | */ | |
865 | int lttng_consumer_get_produced_snapshot( | |
866 | struct lttng_consumer_local_data *ctx, | |
867 | struct lttng_consumer_stream *stream, | |
868 | unsigned long *pos) | |
869 | { | |
870 | switch (consumer_data.type) { | |
871 | case LTTNG_CONSUMER_KERNEL: | |
872 | return lttng_kconsumer_get_produced_snapshot(ctx, stream, pos); | |
7753dea8 MD |
873 | case LTTNG_CONSUMER32_UST: |
874 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
875 | return lttng_ustconsumer_get_produced_snapshot(ctx, stream, pos); |
876 | default: | |
877 | ERR("Unknown consumer_data type"); | |
878 | assert(0); | |
879 | return -ENOSYS; | |
880 | } | |
881 | } | |
882 | ||
883 | int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, | |
884 | int sock, struct pollfd *consumer_sockpoll) | |
885 | { | |
886 | switch (consumer_data.type) { | |
887 | case LTTNG_CONSUMER_KERNEL: | |
888 | return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
7753dea8 MD |
889 | case LTTNG_CONSUMER32_UST: |
890 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
891 | return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll); |
892 | default: | |
893 | ERR("Unknown consumer_data type"); | |
894 | assert(0); | |
895 | return -ENOSYS; | |
896 | } | |
897 | } | |
898 | ||
899 | /* | |
e4421fec | 900 | * This thread polls the fds in the set to consume the data and write |
3bd1e081 MD |
901 | * it to tracefile if necessary. |
902 | */ | |
903 | void *lttng_consumer_thread_poll_fds(void *data) | |
904 | { | |
905 | int num_rdy, num_hup, high_prio, ret, i; | |
906 | struct pollfd *pollfd = NULL; | |
907 | /* local view of the streams */ | |
908 | struct lttng_consumer_stream **local_stream = NULL; | |
909 | /* local view of consumer_data.fds_count */ | |
910 | int nb_fd = 0; | |
911 | char tmp; | |
912 | int tmp2; | |
913 | struct lttng_consumer_local_data *ctx = data; | |
914 | ||
e7b994a3 DG |
915 | rcu_register_thread(); |
916 | ||
effcf122 | 917 | local_stream = zmalloc(sizeof(struct lttng_consumer_stream)); |
3bd1e081 MD |
918 | |
919 | while (1) { | |
920 | high_prio = 0; | |
921 | num_hup = 0; | |
922 | ||
923 | /* | |
e4421fec | 924 | * the fds set has been updated, we need to update our |
3bd1e081 MD |
925 | * local array as well |
926 | */ | |
927 | pthread_mutex_lock(&consumer_data.lock); | |
928 | if (consumer_data.need_update) { | |
929 | if (pollfd != NULL) { | |
930 | free(pollfd); | |
931 | pollfd = NULL; | |
932 | } | |
933 | if (local_stream != NULL) { | |
934 | free(local_stream); | |
935 | local_stream = NULL; | |
936 | } | |
937 | ||
938 | /* allocate for all fds + 1 for the consumer_poll_pipe */ | |
effcf122 | 939 | pollfd = zmalloc((consumer_data.stream_count + 1) * sizeof(struct pollfd)); |
3bd1e081 MD |
940 | if (pollfd == NULL) { |
941 | perror("pollfd malloc"); | |
942 | pthread_mutex_unlock(&consumer_data.lock); | |
943 | goto end; | |
944 | } | |
945 | ||
946 | /* allocate for all fds + 1 for the consumer_poll_pipe */ | |
effcf122 | 947 | local_stream = zmalloc((consumer_data.stream_count + 1) * |
3bd1e081 MD |
948 | sizeof(struct lttng_consumer_stream)); |
949 | if (local_stream == NULL) { | |
950 | perror("local_stream malloc"); | |
951 | pthread_mutex_unlock(&consumer_data.lock); | |
952 | goto end; | |
953 | } | |
954 | ret = consumer_update_poll_array(ctx, &pollfd, local_stream); | |
955 | if (ret < 0) { | |
956 | ERR("Error in allocating pollfd or local_outfds"); | |
957 | lttng_consumer_send_error(ctx, CONSUMERD_POLL_ERROR); | |
958 | pthread_mutex_unlock(&consumer_data.lock); | |
959 | goto end; | |
960 | } | |
961 | nb_fd = ret; | |
962 | consumer_data.need_update = 0; | |
963 | } | |
964 | pthread_mutex_unlock(&consumer_data.lock); | |
965 | ||
4078b776 MD |
966 | /* No FDs and consumer_quit, consumer_cleanup the thread */ |
967 | if (nb_fd == 0 && consumer_quit == 1) { | |
968 | goto end; | |
969 | } | |
3bd1e081 | 970 | /* poll on the array of fds */ |
88f2b785 | 971 | restart: |
3bd1e081 MD |
972 | DBG("polling on %d fd", nb_fd + 1); |
973 | num_rdy = poll(pollfd, nb_fd + 1, consumer_poll_timeout); | |
974 | DBG("poll num_rdy : %d", num_rdy); | |
975 | if (num_rdy == -1) { | |
88f2b785 MD |
976 | /* |
977 | * Restart interrupted system call. | |
978 | */ | |
979 | if (errno == EINTR) { | |
980 | goto restart; | |
981 | } | |
3bd1e081 MD |
982 | perror("Poll error"); |
983 | lttng_consumer_send_error(ctx, CONSUMERD_POLL_ERROR); | |
984 | goto end; | |
985 | } else if (num_rdy == 0) { | |
986 | DBG("Polling thread timed out"); | |
987 | goto end; | |
988 | } | |
989 | ||
3bd1e081 MD |
990 | /* |
991 | * If the consumer_poll_pipe triggered poll go | |
992 | * directly to the beginning of the loop to update the | |
993 | * array. We want to prioritize array update over | |
994 | * low-priority reads. | |
995 | */ | |
d41f73b7 | 996 | if (pollfd[nb_fd].revents & POLLIN) { |
3bd1e081 MD |
997 | DBG("consumer_poll_pipe wake up"); |
998 | tmp2 = read(ctx->consumer_poll_pipe[0], &tmp, 1); | |
999 | if (tmp2 < 0) { | |
d41f73b7 | 1000 | perror("read consumer poll"); |
3bd1e081 MD |
1001 | } |
1002 | continue; | |
1003 | } | |
1004 | ||
1005 | /* Take care of high priority channels first. */ | |
1006 | for (i = 0; i < nb_fd; i++) { | |
d41f73b7 | 1007 | if (pollfd[i].revents & POLLPRI) { |
4078b776 MD |
1008 | ssize_t len; |
1009 | ||
d41f73b7 MD |
1010 | DBG("Urgent read on fd %d", pollfd[i].fd); |
1011 | high_prio = 1; | |
4078b776 | 1012 | len = ctx->on_buffer_ready(local_stream[i], ctx); |
d41f73b7 | 1013 | /* it's ok to have an unavailable sub-buffer */ |
4078b776 MD |
1014 | if (len < 0 && len != -EAGAIN) { |
1015 | goto end; | |
1016 | } else if (len > 0) { | |
1017 | local_stream[i]->data_read = 1; | |
d41f73b7 | 1018 | } |
3bd1e081 MD |
1019 | } |
1020 | } | |
1021 | ||
4078b776 MD |
1022 | /* |
1023 | * If we read high prio channel in this loop, try again | |
1024 | * for more high prio data. | |
1025 | */ | |
1026 | if (high_prio) { | |
3bd1e081 MD |
1027 | continue; |
1028 | } | |
1029 | ||
1030 | /* Take care of low priority channels. */ | |
4078b776 MD |
1031 | for (i = 0; i < nb_fd; i++) { |
1032 | if ((pollfd[i].revents & POLLIN) || | |
1033 | local_stream[i]->hangup_flush_done) { | |
1034 | ssize_t len; | |
1035 | ||
4078b776 MD |
1036 | DBG("Normal read on fd %d", pollfd[i].fd); |
1037 | len = ctx->on_buffer_ready(local_stream[i], ctx); | |
1038 | /* it's ok to have an unavailable sub-buffer */ | |
1039 | if (len < 0 && len != -EAGAIN) { | |
1040 | goto end; | |
1041 | } else if (len > 0) { | |
1042 | local_stream[i]->data_read = 1; | |
1043 | } | |
1044 | } | |
1045 | } | |
1046 | ||
1047 | /* Handle hangup and errors */ | |
1048 | for (i = 0; i < nb_fd; i++) { | |
1049 | if (!local_stream[i]->hangup_flush_done | |
1050 | && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL)) | |
1051 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
1052 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
1053 | DBG("fd %d is hup|err|nval. Attempting flush and read.", | |
1054 | pollfd[i].fd); | |
1055 | lttng_ustconsumer_on_stream_hangup(local_stream[i]); | |
1056 | /* Attempt read again, for the data we just flushed. */ | |
1057 | local_stream[i]->data_read = 1; | |
1058 | } | |
1059 | /* | |
1060 | * If the poll flag is HUP/ERR/NVAL and we have | |
1061 | * read no data in this pass, we can remove the | |
1062 | * stream from its hash table. | |
1063 | */ | |
1064 | if ((pollfd[i].revents & POLLHUP)) { | |
1065 | DBG("Polling fd %d tells it has hung up.", pollfd[i].fd); | |
1066 | if (!local_stream[i]->data_read) { | |
702b1ea4 | 1067 | consumer_del_stream(local_stream[i]); |
4078b776 MD |
1068 | num_hup++; |
1069 | } | |
1070 | } else if (pollfd[i].revents & POLLERR) { | |
1071 | ERR("Error returned in polling fd %d.", pollfd[i].fd); | |
1072 | if (!local_stream[i]->data_read) { | |
702b1ea4 | 1073 | consumer_del_stream(local_stream[i]); |
4078b776 MD |
1074 | num_hup++; |
1075 | } | |
1076 | } else if (pollfd[i].revents & POLLNVAL) { | |
1077 | ERR("Polling fd %d tells fd is not open.", pollfd[i].fd); | |
1078 | if (!local_stream[i]->data_read) { | |
702b1ea4 | 1079 | consumer_del_stream(local_stream[i]); |
4078b776 | 1080 | num_hup++; |
3bd1e081 MD |
1081 | } |
1082 | } | |
4078b776 | 1083 | local_stream[i]->data_read = 0; |
3bd1e081 MD |
1084 | } |
1085 | } | |
1086 | end: | |
1087 | DBG("polling thread exiting"); | |
1088 | if (pollfd != NULL) { | |
1089 | free(pollfd); | |
1090 | pollfd = NULL; | |
1091 | } | |
1092 | if (local_stream != NULL) { | |
1093 | free(local_stream); | |
1094 | local_stream = NULL; | |
1095 | } | |
e7b994a3 | 1096 | rcu_unregister_thread(); |
3bd1e081 MD |
1097 | return NULL; |
1098 | } | |
1099 | ||
1100 | /* | |
1101 | * This thread listens on the consumerd socket and receives the file | |
1102 | * descriptors from the session daemon. | |
1103 | */ | |
1104 | void *lttng_consumer_thread_receive_fds(void *data) | |
1105 | { | |
1106 | int sock, client_socket, ret; | |
1107 | /* | |
1108 | * structure to poll for incoming data on communication socket avoids | |
1109 | * making blocking sockets. | |
1110 | */ | |
1111 | struct pollfd consumer_sockpoll[2]; | |
1112 | struct lttng_consumer_local_data *ctx = data; | |
1113 | ||
e7b994a3 DG |
1114 | rcu_register_thread(); |
1115 | ||
3bd1e081 MD |
1116 | DBG("Creating command socket %s", ctx->consumer_command_sock_path); |
1117 | unlink(ctx->consumer_command_sock_path); | |
1118 | client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path); | |
1119 | if (client_socket < 0) { | |
1120 | ERR("Cannot create command socket"); | |
1121 | goto end; | |
1122 | } | |
1123 | ||
1124 | ret = lttcomm_listen_unix_sock(client_socket); | |
1125 | if (ret < 0) { | |
1126 | goto end; | |
1127 | } | |
1128 | ||
32258573 | 1129 | DBG("Sending ready command to lttng-sessiond"); |
3bd1e081 MD |
1130 | ret = lttng_consumer_send_error(ctx, CONSUMERD_COMMAND_SOCK_READY); |
1131 | /* return < 0 on error, but == 0 is not fatal */ | |
1132 | if (ret < 0) { | |
32258573 | 1133 | ERR("Error sending ready command to lttng-sessiond"); |
3bd1e081 MD |
1134 | goto end; |
1135 | } | |
1136 | ||
1137 | ret = fcntl(client_socket, F_SETFL, O_NONBLOCK); | |
1138 | if (ret < 0) { | |
1139 | perror("fcntl O_NONBLOCK"); | |
1140 | goto end; | |
1141 | } | |
1142 | ||
1143 | /* prepare the FDs to poll : to client socket and the should_quit pipe */ | |
1144 | consumer_sockpoll[0].fd = ctx->consumer_should_quit[0]; | |
1145 | consumer_sockpoll[0].events = POLLIN | POLLPRI; | |
1146 | consumer_sockpoll[1].fd = client_socket; | |
1147 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
1148 | ||
1149 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
1150 | goto end; | |
1151 | } | |
1152 | DBG("Connection on client_socket"); | |
1153 | ||
1154 | /* Blocking call, waiting for transmission */ | |
1155 | sock = lttcomm_accept_unix_sock(client_socket); | |
1156 | if (sock <= 0) { | |
1157 | WARN("On accept"); | |
1158 | goto end; | |
1159 | } | |
1160 | ret = fcntl(sock, F_SETFL, O_NONBLOCK); | |
1161 | if (ret < 0) { | |
1162 | perror("fcntl O_NONBLOCK"); | |
1163 | goto end; | |
1164 | } | |
1165 | ||
1166 | /* update the polling structure to poll on the established socket */ | |
1167 | consumer_sockpoll[1].fd = sock; | |
1168 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
1169 | ||
1170 | while (1) { | |
1171 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
1172 | goto end; | |
1173 | } | |
1174 | DBG("Incoming command on sock"); | |
1175 | ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
1176 | if (ret == -ENOENT) { | |
1177 | DBG("Received STOP command"); | |
1178 | goto end; | |
1179 | } | |
1180 | if (ret < 0) { | |
1181 | ERR("Communication interrupted on command socket"); | |
1182 | goto end; | |
1183 | } | |
1184 | if (consumer_quit) { | |
1185 | DBG("consumer_thread_receive_fds received quit from signal"); | |
1186 | goto end; | |
1187 | } | |
1188 | DBG("received fds on sock"); | |
1189 | } | |
1190 | end: | |
1191 | DBG("consumer_thread_receive_fds exiting"); | |
1192 | ||
1193 | /* | |
1194 | * when all fds have hung up, the polling thread | |
1195 | * can exit cleanly | |
1196 | */ | |
1197 | consumer_quit = 1; | |
1198 | ||
1199 | /* | |
1200 | * 2s of grace period, if no polling events occur during | |
1201 | * this period, the polling thread will exit even if there | |
1202 | * are still open FDs (should not happen, but safety mechanism). | |
1203 | */ | |
1204 | consumer_poll_timeout = LTTNG_CONSUMER_POLL_TIMEOUT; | |
1205 | ||
1206 | /* wake up the polling thread */ | |
1207 | ret = write(ctx->consumer_poll_pipe[1], "4", 1); | |
1208 | if (ret < 0) { | |
1209 | perror("poll pipe write"); | |
1210 | } | |
e7b994a3 | 1211 | rcu_unregister_thread(); |
3bd1e081 MD |
1212 | return NULL; |
1213 | } | |
d41f73b7 | 1214 | |
4078b776 | 1215 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
1216 | struct lttng_consumer_local_data *ctx) |
1217 | { | |
1218 | switch (consumer_data.type) { | |
1219 | case LTTNG_CONSUMER_KERNEL: | |
1220 | return lttng_kconsumer_read_subbuffer(stream, ctx); | |
7753dea8 MD |
1221 | case LTTNG_CONSUMER32_UST: |
1222 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
1223 | return lttng_ustconsumer_read_subbuffer(stream, ctx); |
1224 | default: | |
1225 | ERR("Unknown consumer_data type"); | |
1226 | assert(0); | |
1227 | return -ENOSYS; | |
1228 | } | |
1229 | } | |
1230 | ||
1231 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
1232 | { | |
1233 | switch (consumer_data.type) { | |
1234 | case LTTNG_CONSUMER_KERNEL: | |
1235 | return lttng_kconsumer_on_recv_stream(stream); | |
7753dea8 MD |
1236 | case LTTNG_CONSUMER32_UST: |
1237 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
1238 | return lttng_ustconsumer_on_recv_stream(stream); |
1239 | default: | |
1240 | ERR("Unknown consumer_data type"); | |
1241 | assert(0); | |
1242 | return -ENOSYS; | |
1243 | } | |
1244 | } | |
e4421fec DG |
1245 | |
1246 | /* | |
1247 | * Allocate and set consumer data hash tables. | |
1248 | */ | |
1249 | void lttng_consumer_init(void) | |
1250 | { | |
1251 | consumer_data.stream_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
1252 | consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
1253 | } | |
1254 |