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 | ||
89 | stream = consumer_find_stream(key); | |
90 | if (stream) | |
91 | stream->key = -1; | |
92 | } | |
93 | ||
3bd1e081 MD |
94 | static struct lttng_consumer_channel *consumer_find_channel(int key) |
95 | { | |
e4421fec DG |
96 | struct lttng_ht_iter iter; |
97 | struct lttng_ht_node_ulong *node; | |
98 | struct lttng_consumer_channel *channel = NULL; | |
3bd1e081 | 99 | |
7ad0a0cb MD |
100 | /* Negative keys are lookup failures */ |
101 | if (key < 0) | |
102 | return NULL; | |
e4421fec | 103 | |
6065ceec DG |
104 | rcu_read_lock(); |
105 | ||
e4421fec DG |
106 | lttng_ht_lookup(consumer_data.channel_ht, (void *)((unsigned long) key), |
107 | &iter); | |
108 | node = lttng_ht_iter_get_node_ulong(&iter); | |
109 | if (node != NULL) { | |
110 | channel = caa_container_of(node, struct lttng_consumer_channel, node); | |
3bd1e081 | 111 | } |
e4421fec | 112 | |
6065ceec DG |
113 | rcu_read_unlock(); |
114 | ||
e4421fec | 115 | return channel; |
3bd1e081 MD |
116 | } |
117 | ||
7ad0a0cb MD |
118 | static void consumer_steal_channel_key(int key) |
119 | { | |
120 | struct lttng_consumer_channel *channel; | |
121 | ||
122 | channel = consumer_find_channel(key); | |
123 | if (channel) | |
124 | channel->key = -1; | |
125 | } | |
126 | ||
702b1ea4 MD |
127 | static |
128 | void consumer_free_stream(struct rcu_head *head) | |
129 | { | |
130 | struct lttng_ht_node_ulong *node = | |
131 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
132 | struct lttng_consumer_stream *stream = | |
133 | caa_container_of(node, struct lttng_consumer_stream, node); | |
134 | ||
135 | free(stream); | |
136 | } | |
137 | ||
3bd1e081 MD |
138 | /* |
139 | * Remove a stream from the global list protected by a mutex. This | |
140 | * function is also responsible for freeing its data structures. | |
141 | */ | |
142 | void consumer_del_stream(struct lttng_consumer_stream *stream) | |
143 | { | |
144 | int ret; | |
e4421fec | 145 | struct lttng_ht_iter iter; |
3bd1e081 MD |
146 | struct lttng_consumer_channel *free_chan = NULL; |
147 | ||
148 | pthread_mutex_lock(&consumer_data.lock); | |
149 | ||
150 | switch (consumer_data.type) { | |
151 | case LTTNG_CONSUMER_KERNEL: | |
152 | if (stream->mmap_base != NULL) { | |
153 | ret = munmap(stream->mmap_base, stream->mmap_len); | |
154 | if (ret != 0) { | |
155 | perror("munmap"); | |
156 | } | |
157 | } | |
158 | break; | |
7753dea8 MD |
159 | case LTTNG_CONSUMER32_UST: |
160 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
161 | lttng_ustconsumer_del_stream(stream); |
162 | break; | |
163 | default: | |
164 | ERR("Unknown consumer_data type"); | |
165 | assert(0); | |
166 | goto end; | |
167 | } | |
168 | ||
6065ceec DG |
169 | rcu_read_lock(); |
170 | ||
e4421fec DG |
171 | /* Get stream node from hash table */ |
172 | lttng_ht_lookup(consumer_data.stream_ht, | |
173 | (void *)((unsigned long) stream->key), &iter); | |
702b1ea4 MD |
174 | /* |
175 | * Remove stream node from hash table. It can fail if it's been | |
176 | * replaced due to key reuse. | |
177 | */ | |
178 | (void) lttng_ht_del(consumer_data.stream_ht, &iter); | |
e4421fec | 179 | |
6065ceec DG |
180 | rcu_read_unlock(); |
181 | ||
3bd1e081 MD |
182 | if (consumer_data.stream_count <= 0) { |
183 | goto end; | |
184 | } | |
185 | consumer_data.stream_count--; | |
186 | if (!stream) { | |
187 | goto end; | |
188 | } | |
189 | if (stream->out_fd >= 0) { | |
4c462e79 MD |
190 | ret = close(stream->out_fd); |
191 | if (ret) { | |
192 | PERROR("close"); | |
193 | } | |
3bd1e081 | 194 | } |
b5c5fc29 | 195 | if (stream->wait_fd >= 0 && !stream->wait_fd_is_copy) { |
4c462e79 MD |
196 | ret = close(stream->wait_fd); |
197 | if (ret) { | |
198 | PERROR("close"); | |
199 | } | |
3bd1e081 | 200 | } |
2c1dd183 | 201 | if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) { |
4c462e79 MD |
202 | ret = close(stream->shm_fd); |
203 | if (ret) { | |
204 | PERROR("close"); | |
205 | } | |
3bd1e081 MD |
206 | } |
207 | if (!--stream->chan->refcount) | |
208 | free_chan = stream->chan; | |
702b1ea4 MD |
209 | |
210 | call_rcu(&stream->node.head, consumer_free_stream); | |
3bd1e081 MD |
211 | end: |
212 | consumer_data.need_update = 1; | |
213 | pthread_mutex_unlock(&consumer_data.lock); | |
214 | ||
215 | if (free_chan) | |
216 | consumer_del_channel(free_chan); | |
217 | } | |
218 | ||
219 | struct lttng_consumer_stream *consumer_allocate_stream( | |
220 | int channel_key, int stream_key, | |
221 | int shm_fd, int wait_fd, | |
222 | enum lttng_consumer_stream_state state, | |
223 | uint64_t mmap_len, | |
224 | enum lttng_event_output output, | |
6df2e2c9 MD |
225 | const char *path_name, |
226 | uid_t uid, | |
227 | gid_t gid) | |
3bd1e081 MD |
228 | { |
229 | struct lttng_consumer_stream *stream; | |
230 | int ret; | |
231 | ||
effcf122 | 232 | stream = zmalloc(sizeof(*stream)); |
3bd1e081 MD |
233 | if (stream == NULL) { |
234 | perror("malloc struct lttng_consumer_stream"); | |
235 | goto end; | |
236 | } | |
237 | stream->chan = consumer_find_channel(channel_key); | |
238 | if (!stream->chan) { | |
239 | perror("Unable to find channel key"); | |
240 | goto end; | |
241 | } | |
242 | stream->chan->refcount++; | |
243 | stream->key = stream_key; | |
244 | stream->shm_fd = shm_fd; | |
245 | stream->wait_fd = wait_fd; | |
246 | stream->out_fd = -1; | |
247 | stream->out_fd_offset = 0; | |
248 | stream->state = state; | |
249 | stream->mmap_len = mmap_len; | |
250 | stream->mmap_base = NULL; | |
251 | stream->output = output; | |
6df2e2c9 MD |
252 | stream->uid = uid; |
253 | stream->gid = gid; | |
3bd1e081 MD |
254 | strncpy(stream->path_name, path_name, PATH_MAX - 1); |
255 | stream->path_name[PATH_MAX - 1] = '\0'; | |
e4421fec | 256 | lttng_ht_node_init_ulong(&stream->node, stream->key); |
3bd1e081 MD |
257 | |
258 | switch (consumer_data.type) { | |
259 | case LTTNG_CONSUMER_KERNEL: | |
260 | break; | |
7753dea8 MD |
261 | case LTTNG_CONSUMER32_UST: |
262 | case LTTNG_CONSUMER64_UST: | |
5af2f756 | 263 | stream->cpu = stream->chan->cpucount++; |
3bd1e081 MD |
264 | ret = lttng_ustconsumer_allocate_stream(stream); |
265 | if (ret) { | |
266 | free(stream); | |
267 | return NULL; | |
268 | } | |
269 | break; | |
270 | default: | |
271 | ERR("Unknown consumer_data type"); | |
272 | assert(0); | |
273 | goto end; | |
274 | } | |
275 | DBG("Allocated stream %s (key %d, shm_fd %d, wait_fd %d, mmap_len %llu, out_fd %d)", | |
276 | stream->path_name, stream->key, | |
277 | stream->shm_fd, | |
278 | stream->wait_fd, | |
279 | (unsigned long long) stream->mmap_len, | |
280 | stream->out_fd); | |
281 | end: | |
282 | return stream; | |
283 | } | |
284 | ||
285 | /* | |
286 | * Add a stream to the global list protected by a mutex. | |
287 | */ | |
288 | int consumer_add_stream(struct lttng_consumer_stream *stream) | |
289 | { | |
290 | int ret = 0; | |
291 | ||
292 | pthread_mutex_lock(&consumer_data.lock); | |
7ad0a0cb MD |
293 | /* Steal stream identifier, for UST */ |
294 | consumer_steal_stream_key(stream->key); | |
6065ceec | 295 | rcu_read_lock(); |
702b1ea4 MD |
296 | /* |
297 | * We simply remove the old channel from the hash table. It's | |
298 | * ok, since we know for sure the sessiond wants to replace it | |
299 | * with the new version, because the key has been reused. | |
300 | */ | |
301 | (void) lttng_ht_add_replace_ulong(consumer_data.stream_ht, &stream->node); | |
6065ceec | 302 | rcu_read_unlock(); |
3bd1e081 MD |
303 | consumer_data.stream_count++; |
304 | consumer_data.need_update = 1; | |
305 | ||
306 | switch (consumer_data.type) { | |
307 | case LTTNG_CONSUMER_KERNEL: | |
308 | break; | |
7753dea8 MD |
309 | case LTTNG_CONSUMER32_UST: |
310 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
311 | /* Streams are in CPU number order (we rely on this) */ |
312 | stream->cpu = stream->chan->nr_streams++; | |
313 | break; | |
314 | default: | |
315 | ERR("Unknown consumer_data type"); | |
316 | assert(0); | |
317 | goto end; | |
318 | } | |
319 | ||
320 | end: | |
321 | pthread_mutex_unlock(&consumer_data.lock); | |
702b1ea4 | 322 | |
3bd1e081 MD |
323 | return ret; |
324 | } | |
325 | ||
326 | /* | |
327 | * Update a stream according to what we just received. | |
328 | */ | |
329 | void consumer_change_stream_state(int stream_key, | |
330 | enum lttng_consumer_stream_state state) | |
331 | { | |
332 | struct lttng_consumer_stream *stream; | |
333 | ||
334 | pthread_mutex_lock(&consumer_data.lock); | |
335 | stream = consumer_find_stream(stream_key); | |
336 | if (stream) { | |
337 | stream->state = state; | |
338 | } | |
339 | consumer_data.need_update = 1; | |
340 | pthread_mutex_unlock(&consumer_data.lock); | |
341 | } | |
342 | ||
702b1ea4 MD |
343 | static |
344 | void consumer_free_channel(struct rcu_head *head) | |
345 | { | |
346 | struct lttng_ht_node_ulong *node = | |
347 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
348 | struct lttng_consumer_channel *channel = | |
349 | caa_container_of(node, struct lttng_consumer_channel, node); | |
350 | ||
351 | free(channel); | |
352 | } | |
353 | ||
3bd1e081 MD |
354 | /* |
355 | * Remove a channel from the global list protected by a mutex. This | |
356 | * function is also responsible for freeing its data structures. | |
357 | */ | |
358 | void consumer_del_channel(struct lttng_consumer_channel *channel) | |
359 | { | |
360 | int ret; | |
e4421fec | 361 | struct lttng_ht_iter iter; |
3bd1e081 MD |
362 | |
363 | pthread_mutex_lock(&consumer_data.lock); | |
364 | ||
365 | switch (consumer_data.type) { | |
366 | case LTTNG_CONSUMER_KERNEL: | |
367 | break; | |
7753dea8 MD |
368 | case LTTNG_CONSUMER32_UST: |
369 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
370 | lttng_ustconsumer_del_channel(channel); |
371 | break; | |
372 | default: | |
373 | ERR("Unknown consumer_data type"); | |
374 | assert(0); | |
375 | goto end; | |
376 | } | |
377 | ||
6065ceec DG |
378 | rcu_read_lock(); |
379 | ||
e4421fec DG |
380 | lttng_ht_lookup(consumer_data.channel_ht, |
381 | (void *)((unsigned long) channel->key), &iter); | |
702b1ea4 MD |
382 | |
383 | /* | |
384 | * Remove channel node from hash table. It can fail if it's been | |
385 | * replaced due to key reuse. | |
386 | */ | |
387 | (void) lttng_ht_del(consumer_data.channel_ht, &iter); | |
e4421fec | 388 | |
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(); |
702b1ea4 MD |
475 | /* |
476 | * We simply remove the old channel from the hash table. It's | |
477 | * ok, since we know for sure the sessiond wants to replace it | |
478 | * with the new version, because the key has been reused. | |
479 | */ | |
480 | (void) lttng_ht_add_replace_ulong(consumer_data.channel_ht, &channel->node); | |
6065ceec | 481 | rcu_read_unlock(); |
3bd1e081 | 482 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 483 | |
7ad0a0cb | 484 | return 0; |
3bd1e081 MD |
485 | } |
486 | ||
487 | /* | |
488 | * Allocate the pollfd structure and the local view of the out fds to avoid | |
489 | * doing a lookup in the linked list and concurrency issues when writing is | |
490 | * needed. Called with consumer_data.lock held. | |
491 | * | |
492 | * Returns the number of fds in the structures. | |
493 | */ | |
494 | int consumer_update_poll_array( | |
495 | struct lttng_consumer_local_data *ctx, struct pollfd **pollfd, | |
496 | struct lttng_consumer_stream **local_stream) | |
497 | { | |
3bd1e081 | 498 | int i = 0; |
e4421fec DG |
499 | struct lttng_ht_iter iter; |
500 | struct lttng_consumer_stream *stream; | |
3bd1e081 MD |
501 | |
502 | DBG("Updating poll fd array"); | |
481d6c57 | 503 | rcu_read_lock(); |
e4421fec DG |
504 | cds_lfht_for_each_entry(consumer_data.stream_ht->ht, &iter.iter, stream, |
505 | node.node) { | |
506 | if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM) { | |
3bd1e081 MD |
507 | continue; |
508 | } | |
e4421fec DG |
509 | DBG("Active FD %d", stream->wait_fd); |
510 | (*pollfd)[i].fd = stream->wait_fd; | |
3bd1e081 | 511 | (*pollfd)[i].events = POLLIN | POLLPRI; |
e4421fec | 512 | local_stream[i] = stream; |
3bd1e081 MD |
513 | i++; |
514 | } | |
481d6c57 | 515 | rcu_read_unlock(); |
3bd1e081 MD |
516 | |
517 | /* | |
518 | * Insert the consumer_poll_pipe at the end of the array and don't | |
519 | * increment i so nb_fd is the number of real FD. | |
520 | */ | |
521 | (*pollfd)[i].fd = ctx->consumer_poll_pipe[0]; | |
522 | (*pollfd)[i].events = POLLIN; | |
523 | return i; | |
524 | } | |
525 | ||
526 | /* | |
527 | * Poll on the should_quit pipe and the command socket return -1 on error and | |
528 | * should exit, 0 if data is available on the command socket | |
529 | */ | |
530 | int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll) | |
531 | { | |
532 | int num_rdy; | |
533 | ||
a8b0b341 | 534 | restart: |
3bd1e081 MD |
535 | num_rdy = poll(consumer_sockpoll, 2, -1); |
536 | if (num_rdy == -1) { | |
a8b0b341 MD |
537 | /* |
538 | * Restart interrupted system call. | |
539 | */ | |
540 | if (errno == EINTR) { | |
541 | goto restart; | |
542 | } | |
3bd1e081 MD |
543 | perror("Poll error"); |
544 | goto exit; | |
545 | } | |
546 | if (consumer_sockpoll[0].revents == POLLIN) { | |
547 | DBG("consumer_should_quit wake up"); | |
548 | goto exit; | |
549 | } | |
550 | return 0; | |
551 | ||
552 | exit: | |
553 | return -1; | |
554 | } | |
555 | ||
556 | /* | |
557 | * Set the error socket. | |
558 | */ | |
559 | void lttng_consumer_set_error_sock( | |
560 | struct lttng_consumer_local_data *ctx, int sock) | |
561 | { | |
562 | ctx->consumer_error_socket = sock; | |
563 | } | |
564 | ||
565 | /* | |
566 | * Set the command socket path. | |
567 | */ | |
568 | ||
569 | void lttng_consumer_set_command_sock_path( | |
570 | struct lttng_consumer_local_data *ctx, char *sock) | |
571 | { | |
572 | ctx->consumer_command_sock_path = sock; | |
573 | } | |
574 | ||
575 | /* | |
576 | * Send return code to the session daemon. | |
577 | * If the socket is not defined, we return 0, it is not a fatal error | |
578 | */ | |
579 | int lttng_consumer_send_error( | |
580 | struct lttng_consumer_local_data *ctx, int cmd) | |
581 | { | |
582 | if (ctx->consumer_error_socket > 0) { | |
583 | return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd, | |
584 | sizeof(enum lttcomm_sessiond_command)); | |
585 | } | |
586 | ||
587 | return 0; | |
588 | } | |
589 | ||
590 | /* | |
591 | * Close all the tracefiles and stream fds, should be called when all instances | |
592 | * are destroyed. | |
593 | */ | |
594 | void lttng_consumer_cleanup(void) | |
595 | { | |
e4421fec | 596 | struct lttng_ht_iter iter; |
6065ceec DG |
597 | struct lttng_ht_node_ulong *node; |
598 | ||
599 | rcu_read_lock(); | |
3bd1e081 MD |
600 | |
601 | /* | |
6065ceec DG |
602 | * close all outfd. Called when there are no more threads running (after |
603 | * joining on the threads), no need to protect list iteration with mutex. | |
3bd1e081 | 604 | */ |
6065ceec DG |
605 | cds_lfht_for_each_entry(consumer_data.stream_ht->ht, &iter.iter, node, |
606 | node) { | |
702b1ea4 MD |
607 | struct lttng_consumer_stream *stream = |
608 | caa_container_of(node, struct lttng_consumer_stream, node); | |
609 | consumer_del_stream(stream); | |
3bd1e081 | 610 | } |
e4421fec | 611 | |
6065ceec DG |
612 | cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, node, |
613 | node) { | |
702b1ea4 MD |
614 | struct lttng_consumer_channel *channel = |
615 | caa_container_of(node, struct lttng_consumer_channel, node); | |
616 | consumer_del_channel(channel); | |
3bd1e081 | 617 | } |
6065ceec DG |
618 | |
619 | rcu_read_unlock(); | |
3bd1e081 MD |
620 | } |
621 | ||
622 | /* | |
623 | * Called from signal handler. | |
624 | */ | |
625 | void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx) | |
626 | { | |
627 | int ret; | |
628 | consumer_quit = 1; | |
629 | ret = write(ctx->consumer_should_quit[1], "4", 1); | |
630 | if (ret < 0) { | |
631 | perror("write consumer quit"); | |
632 | } | |
633 | } | |
634 | ||
635 | void lttng_consumer_sync_trace_file( | |
636 | struct lttng_consumer_stream *stream, off_t orig_offset) | |
637 | { | |
638 | int outfd = stream->out_fd; | |
639 | ||
640 | /* | |
641 | * This does a blocking write-and-wait on any page that belongs to the | |
642 | * subbuffer prior to the one we just wrote. | |
643 | * Don't care about error values, as these are just hints and ways to | |
644 | * limit the amount of page cache used. | |
645 | */ | |
646 | if (orig_offset < stream->chan->max_sb_size) { | |
647 | return; | |
648 | } | |
ca4537d3 | 649 | sync_file_range(outfd, orig_offset - stream->chan->max_sb_size, |
3bd1e081 MD |
650 | stream->chan->max_sb_size, |
651 | SYNC_FILE_RANGE_WAIT_BEFORE | |
652 | | SYNC_FILE_RANGE_WRITE | |
653 | | SYNC_FILE_RANGE_WAIT_AFTER); | |
654 | /* | |
655 | * Give hints to the kernel about how we access the file: | |
656 | * POSIX_FADV_DONTNEED : we won't re-access data in a near future after | |
657 | * we write it. | |
658 | * | |
659 | * We need to call fadvise again after the file grows because the | |
660 | * kernel does not seem to apply fadvise to non-existing parts of the | |
661 | * file. | |
662 | * | |
663 | * Call fadvise _after_ having waited for the page writeback to | |
664 | * complete because the dirty page writeback semantic is not well | |
665 | * defined. So it can be expected to lead to lower throughput in | |
666 | * streaming. | |
667 | */ | |
668 | posix_fadvise(outfd, orig_offset - stream->chan->max_sb_size, | |
669 | stream->chan->max_sb_size, POSIX_FADV_DONTNEED); | |
670 | } | |
671 | ||
672 | /* | |
673 | * Initialise the necessary environnement : | |
674 | * - create a new context | |
675 | * - create the poll_pipe | |
676 | * - create the should_quit pipe (for signal handler) | |
677 | * - create the thread pipe (for splice) | |
678 | * | |
679 | * Takes a function pointer as argument, this function is called when data is | |
680 | * available on a buffer. This function is responsible to do the | |
681 | * kernctl_get_next_subbuf, read the data with mmap or splice depending on the | |
682 | * buffer configuration and then kernctl_put_next_subbuf at the end. | |
683 | * | |
684 | * Returns a pointer to the new context or NULL on error. | |
685 | */ | |
686 | struct lttng_consumer_local_data *lttng_consumer_create( | |
687 | enum lttng_consumer_type type, | |
f5204c94 | 688 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
d41f73b7 | 689 | struct lttng_consumer_local_data *ctx), |
3bd1e081 MD |
690 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
691 | int (*recv_stream)(struct lttng_consumer_stream *stream), | |
692 | int (*update_stream)(int stream_key, uint32_t state)) | |
693 | { | |
694 | int ret, i; | |
695 | struct lttng_consumer_local_data *ctx; | |
696 | ||
697 | assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN || | |
698 | consumer_data.type == type); | |
699 | consumer_data.type = type; | |
700 | ||
effcf122 | 701 | ctx = zmalloc(sizeof(struct lttng_consumer_local_data)); |
3bd1e081 MD |
702 | if (ctx == NULL) { |
703 | perror("allocating context"); | |
704 | goto error; | |
705 | } | |
706 | ||
707 | ctx->consumer_error_socket = -1; | |
708 | /* assign the callbacks */ | |
709 | ctx->on_buffer_ready = buffer_ready; | |
710 | ctx->on_recv_channel = recv_channel; | |
711 | ctx->on_recv_stream = recv_stream; | |
712 | ctx->on_update_stream = update_stream; | |
713 | ||
714 | ret = pipe(ctx->consumer_poll_pipe); | |
715 | if (ret < 0) { | |
716 | perror("Error creating poll pipe"); | |
717 | goto error_poll_pipe; | |
718 | } | |
719 | ||
720 | ret = pipe(ctx->consumer_should_quit); | |
721 | if (ret < 0) { | |
722 | perror("Error creating recv pipe"); | |
723 | goto error_quit_pipe; | |
724 | } | |
725 | ||
726 | ret = pipe(ctx->consumer_thread_pipe); | |
727 | if (ret < 0) { | |
728 | perror("Error creating thread pipe"); | |
729 | goto error_thread_pipe; | |
730 | } | |
731 | ||
732 | return ctx; | |
733 | ||
734 | ||
735 | error_thread_pipe: | |
736 | for (i = 0; i < 2; i++) { | |
737 | int err; | |
738 | ||
739 | err = close(ctx->consumer_should_quit[i]); | |
4c462e79 MD |
740 | if (err) { |
741 | PERROR("close"); | |
742 | } | |
3bd1e081 MD |
743 | } |
744 | error_quit_pipe: | |
745 | for (i = 0; i < 2; i++) { | |
746 | int err; | |
747 | ||
748 | err = close(ctx->consumer_poll_pipe[i]); | |
4c462e79 MD |
749 | if (err) { |
750 | PERROR("close"); | |
751 | } | |
3bd1e081 MD |
752 | } |
753 | error_poll_pipe: | |
754 | free(ctx); | |
755 | error: | |
756 | return NULL; | |
757 | } | |
758 | ||
759 | /* | |
760 | * Close all fds associated with the instance and free the context. | |
761 | */ | |
762 | void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx) | |
763 | { | |
4c462e79 MD |
764 | int ret; |
765 | ||
766 | ret = close(ctx->consumer_error_socket); | |
767 | if (ret) { | |
768 | PERROR("close"); | |
769 | } | |
770 | ret = close(ctx->consumer_thread_pipe[0]); | |
771 | if (ret) { | |
772 | PERROR("close"); | |
773 | } | |
774 | ret = close(ctx->consumer_thread_pipe[1]); | |
775 | if (ret) { | |
776 | PERROR("close"); | |
777 | } | |
778 | ret = close(ctx->consumer_poll_pipe[0]); | |
779 | if (ret) { | |
780 | PERROR("close"); | |
781 | } | |
782 | ret = close(ctx->consumer_poll_pipe[1]); | |
783 | if (ret) { | |
784 | PERROR("close"); | |
785 | } | |
786 | ret = close(ctx->consumer_should_quit[0]); | |
787 | if (ret) { | |
788 | PERROR("close"); | |
789 | } | |
790 | ret = close(ctx->consumer_should_quit[1]); | |
791 | if (ret) { | |
792 | PERROR("close"); | |
793 | } | |
3bd1e081 MD |
794 | unlink(ctx->consumer_command_sock_path); |
795 | free(ctx); | |
796 | } | |
797 | ||
798 | /* | |
799 | * Mmap the ring buffer, read it and write the data to the tracefile. | |
800 | * | |
801 | * Returns the number of bytes written | |
802 | */ | |
f5204c94 | 803 | ssize_t lttng_consumer_on_read_subbuffer_mmap( |
3bd1e081 MD |
804 | struct lttng_consumer_local_data *ctx, |
805 | struct lttng_consumer_stream *stream, unsigned long len) | |
806 | { | |
807 | switch (consumer_data.type) { | |
808 | case LTTNG_CONSUMER_KERNEL: | |
809 | return lttng_kconsumer_on_read_subbuffer_mmap(ctx, stream, len); | |
7753dea8 MD |
810 | case LTTNG_CONSUMER32_UST: |
811 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
812 | return lttng_ustconsumer_on_read_subbuffer_mmap(ctx, stream, len); |
813 | default: | |
814 | ERR("Unknown consumer_data type"); | |
815 | assert(0); | |
816 | } | |
817 | } | |
818 | ||
819 | /* | |
820 | * Splice the data from the ring buffer to the tracefile. | |
821 | * | |
822 | * Returns the number of bytes spliced. | |
823 | */ | |
f5204c94 | 824 | ssize_t lttng_consumer_on_read_subbuffer_splice( |
3bd1e081 MD |
825 | struct lttng_consumer_local_data *ctx, |
826 | struct lttng_consumer_stream *stream, unsigned long len) | |
827 | { | |
828 | switch (consumer_data.type) { | |
829 | case LTTNG_CONSUMER_KERNEL: | |
830 | return lttng_kconsumer_on_read_subbuffer_splice(ctx, stream, len); | |
7753dea8 MD |
831 | case LTTNG_CONSUMER32_UST: |
832 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
833 | return -ENOSYS; |
834 | default: | |
835 | ERR("Unknown consumer_data type"); | |
836 | assert(0); | |
837 | return -ENOSYS; | |
838 | } | |
839 | ||
840 | } | |
841 | ||
842 | /* | |
843 | * Take a snapshot for a specific fd | |
844 | * | |
845 | * Returns 0 on success, < 0 on error | |
846 | */ | |
847 | int lttng_consumer_take_snapshot(struct lttng_consumer_local_data *ctx, | |
848 | struct lttng_consumer_stream *stream) | |
849 | { | |
850 | switch (consumer_data.type) { | |
851 | case LTTNG_CONSUMER_KERNEL: | |
852 | return lttng_kconsumer_take_snapshot(ctx, stream); | |
7753dea8 MD |
853 | case LTTNG_CONSUMER32_UST: |
854 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
855 | return lttng_ustconsumer_take_snapshot(ctx, stream); |
856 | default: | |
857 | ERR("Unknown consumer_data type"); | |
858 | assert(0); | |
859 | return -ENOSYS; | |
860 | } | |
861 | ||
862 | } | |
863 | ||
864 | /* | |
865 | * Get the produced position | |
866 | * | |
867 | * Returns 0 on success, < 0 on error | |
868 | */ | |
869 | int lttng_consumer_get_produced_snapshot( | |
870 | struct lttng_consumer_local_data *ctx, | |
871 | struct lttng_consumer_stream *stream, | |
872 | unsigned long *pos) | |
873 | { | |
874 | switch (consumer_data.type) { | |
875 | case LTTNG_CONSUMER_KERNEL: | |
876 | return lttng_kconsumer_get_produced_snapshot(ctx, stream, pos); | |
7753dea8 MD |
877 | case LTTNG_CONSUMER32_UST: |
878 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
879 | return lttng_ustconsumer_get_produced_snapshot(ctx, stream, pos); |
880 | default: | |
881 | ERR("Unknown consumer_data type"); | |
882 | assert(0); | |
883 | return -ENOSYS; | |
884 | } | |
885 | } | |
886 | ||
887 | int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, | |
888 | int sock, struct pollfd *consumer_sockpoll) | |
889 | { | |
890 | switch (consumer_data.type) { | |
891 | case LTTNG_CONSUMER_KERNEL: | |
892 | return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
7753dea8 MD |
893 | case LTTNG_CONSUMER32_UST: |
894 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
895 | return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll); |
896 | default: | |
897 | ERR("Unknown consumer_data type"); | |
898 | assert(0); | |
899 | return -ENOSYS; | |
900 | } | |
901 | } | |
902 | ||
903 | /* | |
e4421fec | 904 | * This thread polls the fds in the set to consume the data and write |
3bd1e081 MD |
905 | * it to tracefile if necessary. |
906 | */ | |
907 | void *lttng_consumer_thread_poll_fds(void *data) | |
908 | { | |
909 | int num_rdy, num_hup, high_prio, ret, i; | |
910 | struct pollfd *pollfd = NULL; | |
911 | /* local view of the streams */ | |
912 | struct lttng_consumer_stream **local_stream = NULL; | |
913 | /* local view of consumer_data.fds_count */ | |
914 | int nb_fd = 0; | |
915 | char tmp; | |
916 | int tmp2; | |
917 | struct lttng_consumer_local_data *ctx = data; | |
918 | ||
e7b994a3 DG |
919 | rcu_register_thread(); |
920 | ||
effcf122 | 921 | local_stream = zmalloc(sizeof(struct lttng_consumer_stream)); |
3bd1e081 MD |
922 | |
923 | while (1) { | |
924 | high_prio = 0; | |
925 | num_hup = 0; | |
926 | ||
927 | /* | |
e4421fec | 928 | * the fds set has been updated, we need to update our |
3bd1e081 MD |
929 | * local array as well |
930 | */ | |
931 | pthread_mutex_lock(&consumer_data.lock); | |
932 | if (consumer_data.need_update) { | |
933 | if (pollfd != NULL) { | |
934 | free(pollfd); | |
935 | pollfd = NULL; | |
936 | } | |
937 | if (local_stream != NULL) { | |
938 | free(local_stream); | |
939 | local_stream = NULL; | |
940 | } | |
941 | ||
942 | /* allocate for all fds + 1 for the consumer_poll_pipe */ | |
effcf122 | 943 | pollfd = zmalloc((consumer_data.stream_count + 1) * sizeof(struct pollfd)); |
3bd1e081 MD |
944 | if (pollfd == NULL) { |
945 | perror("pollfd malloc"); | |
946 | pthread_mutex_unlock(&consumer_data.lock); | |
947 | goto end; | |
948 | } | |
949 | ||
950 | /* allocate for all fds + 1 for the consumer_poll_pipe */ | |
effcf122 | 951 | local_stream = zmalloc((consumer_data.stream_count + 1) * |
3bd1e081 MD |
952 | sizeof(struct lttng_consumer_stream)); |
953 | if (local_stream == NULL) { | |
954 | perror("local_stream malloc"); | |
955 | pthread_mutex_unlock(&consumer_data.lock); | |
956 | goto end; | |
957 | } | |
958 | ret = consumer_update_poll_array(ctx, &pollfd, local_stream); | |
959 | if (ret < 0) { | |
960 | ERR("Error in allocating pollfd or local_outfds"); | |
961 | lttng_consumer_send_error(ctx, CONSUMERD_POLL_ERROR); | |
962 | pthread_mutex_unlock(&consumer_data.lock); | |
963 | goto end; | |
964 | } | |
965 | nb_fd = ret; | |
966 | consumer_data.need_update = 0; | |
967 | } | |
968 | pthread_mutex_unlock(&consumer_data.lock); | |
969 | ||
f5204c94 MD |
970 | /* No FDs and consumer_quit, consumer_cleanup the thread */ |
971 | if (nb_fd == 0 && consumer_quit == 1) { | |
972 | goto end; | |
973 | } | |
3bd1e081 | 974 | /* poll on the array of fds */ |
a8b0b341 | 975 | restart: |
3bd1e081 MD |
976 | DBG("polling on %d fd", nb_fd + 1); |
977 | num_rdy = poll(pollfd, nb_fd + 1, consumer_poll_timeout); | |
978 | DBG("poll num_rdy : %d", num_rdy); | |
979 | if (num_rdy == -1) { | |
a8b0b341 MD |
980 | /* |
981 | * Restart interrupted system call. | |
982 | */ | |
983 | if (errno == EINTR) { | |
984 | goto restart; | |
985 | } | |
3bd1e081 MD |
986 | perror("Poll error"); |
987 | lttng_consumer_send_error(ctx, CONSUMERD_POLL_ERROR); | |
988 | goto end; | |
989 | } else if (num_rdy == 0) { | |
990 | DBG("Polling thread timed out"); | |
991 | goto end; | |
992 | } | |
993 | ||
3bd1e081 MD |
994 | /* |
995 | * If the consumer_poll_pipe triggered poll go | |
996 | * directly to the beginning of the loop to update the | |
997 | * array. We want to prioritize array update over | |
998 | * low-priority reads. | |
999 | */ | |
d41f73b7 | 1000 | if (pollfd[nb_fd].revents & POLLIN) { |
3bd1e081 MD |
1001 | DBG("consumer_poll_pipe wake up"); |
1002 | tmp2 = read(ctx->consumer_poll_pipe[0], &tmp, 1); | |
1003 | if (tmp2 < 0) { | |
d41f73b7 | 1004 | perror("read consumer poll"); |
3bd1e081 MD |
1005 | } |
1006 | continue; | |
1007 | } | |
1008 | ||
1009 | /* Take care of high priority channels first. */ | |
1010 | for (i = 0; i < nb_fd; i++) { | |
d41f73b7 | 1011 | if (pollfd[i].revents & POLLPRI) { |
f5204c94 MD |
1012 | ssize_t len; |
1013 | ||
d41f73b7 MD |
1014 | DBG("Urgent read on fd %d", pollfd[i].fd); |
1015 | high_prio = 1; | |
f5204c94 | 1016 | len = ctx->on_buffer_ready(local_stream[i], ctx); |
d41f73b7 | 1017 | /* it's ok to have an unavailable sub-buffer */ |
f5204c94 MD |
1018 | if (len < 0 && len != -EAGAIN) { |
1019 | goto end; | |
1020 | } else if (len > 0) { | |
1021 | local_stream[i]->data_read = 1; | |
d41f73b7 | 1022 | } |
3bd1e081 MD |
1023 | } |
1024 | } | |
1025 | ||
f5204c94 MD |
1026 | /* |
1027 | * If we read high prio channel in this loop, try again | |
1028 | * for more high prio data. | |
1029 | */ | |
1030 | if (high_prio) { | |
3bd1e081 MD |
1031 | continue; |
1032 | } | |
1033 | ||
1034 | /* Take care of low priority channels. */ | |
f5204c94 MD |
1035 | for (i = 0; i < nb_fd; i++) { |
1036 | if ((pollfd[i].revents & POLLIN) || | |
1037 | local_stream[i]->hangup_flush_done) { | |
1038 | ssize_t len; | |
1039 | ||
1040 | assert(!(pollfd[i].revents & POLLERR)); | |
1041 | assert(!(pollfd[i].revents & POLLNVAL)); | |
1042 | DBG("Normal read on fd %d", pollfd[i].fd); | |
1043 | len = ctx->on_buffer_ready(local_stream[i], ctx); | |
1044 | /* it's ok to have an unavailable sub-buffer */ | |
1045 | if (len < 0 && len != -EAGAIN) { | |
1046 | goto end; | |
1047 | } else if (len > 0) { | |
1048 | local_stream[i]->data_read = 1; | |
1049 | } | |
1050 | } | |
1051 | } | |
1052 | ||
1053 | /* Handle hangup and errors */ | |
1054 | for (i = 0; i < nb_fd; i++) { | |
1055 | if (!local_stream[i]->hangup_flush_done | |
1056 | && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL)) | |
1057 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
1058 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
1059 | DBG("fd %d is hup|err|nval. Attempting flush and read.", | |
1060 | pollfd[i].fd); | |
1061 | lttng_ustconsumer_on_stream_hangup(local_stream[i]); | |
1062 | /* Attempt read again, for the data we just flushed. */ | |
1063 | local_stream[i]->data_read = 1; | |
1064 | } | |
1065 | /* | |
1066 | * If the poll flag is HUP/ERR/NVAL and we have | |
1067 | * read no data in this pass, we can remove the | |
1068 | * stream from its hash table. | |
1069 | */ | |
1070 | if ((pollfd[i].revents & POLLHUP)) { | |
1071 | DBG("Polling fd %d tells it has hung up.", pollfd[i].fd); | |
1072 | if (!local_stream[i]->data_read) { | |
702b1ea4 | 1073 | consumer_del_stream(local_stream[i]); |
f5204c94 MD |
1074 | num_hup++; |
1075 | } | |
1076 | } else if (pollfd[i].revents & POLLERR) { | |
1077 | ERR("Error returned in polling fd %d.", pollfd[i].fd); | |
1078 | if (!local_stream[i]->data_read) { | |
702b1ea4 | 1079 | consumer_del_stream(local_stream[i]); |
f5204c94 MD |
1080 | num_hup++; |
1081 | } | |
1082 | } else if (pollfd[i].revents & POLLNVAL) { | |
1083 | ERR("Polling fd %d tells fd is not open.", pollfd[i].fd); | |
1084 | if (!local_stream[i]->data_read) { | |
702b1ea4 | 1085 | consumer_del_stream(local_stream[i]); |
f5204c94 | 1086 | num_hup++; |
3bd1e081 MD |
1087 | } |
1088 | } | |
f5204c94 | 1089 | local_stream[i]->data_read = 0; |
3bd1e081 MD |
1090 | } |
1091 | } | |
1092 | end: | |
1093 | DBG("polling thread exiting"); | |
1094 | if (pollfd != NULL) { | |
1095 | free(pollfd); | |
1096 | pollfd = NULL; | |
1097 | } | |
1098 | if (local_stream != NULL) { | |
1099 | free(local_stream); | |
1100 | local_stream = NULL; | |
1101 | } | |
e7b994a3 | 1102 | rcu_unregister_thread(); |
3bd1e081 MD |
1103 | return NULL; |
1104 | } | |
1105 | ||
1106 | /* | |
1107 | * This thread listens on the consumerd socket and receives the file | |
1108 | * descriptors from the session daemon. | |
1109 | */ | |
1110 | void *lttng_consumer_thread_receive_fds(void *data) | |
1111 | { | |
1112 | int sock, client_socket, ret; | |
1113 | /* | |
1114 | * structure to poll for incoming data on communication socket avoids | |
1115 | * making blocking sockets. | |
1116 | */ | |
1117 | struct pollfd consumer_sockpoll[2]; | |
1118 | struct lttng_consumer_local_data *ctx = data; | |
1119 | ||
e7b994a3 DG |
1120 | rcu_register_thread(); |
1121 | ||
3bd1e081 MD |
1122 | DBG("Creating command socket %s", ctx->consumer_command_sock_path); |
1123 | unlink(ctx->consumer_command_sock_path); | |
1124 | client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path); | |
1125 | if (client_socket < 0) { | |
1126 | ERR("Cannot create command socket"); | |
1127 | goto end; | |
1128 | } | |
1129 | ||
1130 | ret = lttcomm_listen_unix_sock(client_socket); | |
1131 | if (ret < 0) { | |
1132 | goto end; | |
1133 | } | |
1134 | ||
32258573 | 1135 | DBG("Sending ready command to lttng-sessiond"); |
3bd1e081 MD |
1136 | ret = lttng_consumer_send_error(ctx, CONSUMERD_COMMAND_SOCK_READY); |
1137 | /* return < 0 on error, but == 0 is not fatal */ | |
1138 | if (ret < 0) { | |
32258573 | 1139 | ERR("Error sending ready command to lttng-sessiond"); |
3bd1e081 MD |
1140 | goto end; |
1141 | } | |
1142 | ||
1143 | ret = fcntl(client_socket, F_SETFL, O_NONBLOCK); | |
1144 | if (ret < 0) { | |
1145 | perror("fcntl O_NONBLOCK"); | |
1146 | goto end; | |
1147 | } | |
1148 | ||
1149 | /* prepare the FDs to poll : to client socket and the should_quit pipe */ | |
1150 | consumer_sockpoll[0].fd = ctx->consumer_should_quit[0]; | |
1151 | consumer_sockpoll[0].events = POLLIN | POLLPRI; | |
1152 | consumer_sockpoll[1].fd = client_socket; | |
1153 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
1154 | ||
1155 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
1156 | goto end; | |
1157 | } | |
1158 | DBG("Connection on client_socket"); | |
1159 | ||
1160 | /* Blocking call, waiting for transmission */ | |
1161 | sock = lttcomm_accept_unix_sock(client_socket); | |
1162 | if (sock <= 0) { | |
1163 | WARN("On accept"); | |
1164 | goto end; | |
1165 | } | |
1166 | ret = fcntl(sock, F_SETFL, O_NONBLOCK); | |
1167 | if (ret < 0) { | |
1168 | perror("fcntl O_NONBLOCK"); | |
1169 | goto end; | |
1170 | } | |
1171 | ||
1172 | /* update the polling structure to poll on the established socket */ | |
1173 | consumer_sockpoll[1].fd = sock; | |
1174 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
1175 | ||
1176 | while (1) { | |
1177 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
1178 | goto end; | |
1179 | } | |
1180 | DBG("Incoming command on sock"); | |
1181 | ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
1182 | if (ret == -ENOENT) { | |
1183 | DBG("Received STOP command"); | |
1184 | goto end; | |
1185 | } | |
1186 | if (ret < 0) { | |
1187 | ERR("Communication interrupted on command socket"); | |
1188 | goto end; | |
1189 | } | |
1190 | if (consumer_quit) { | |
1191 | DBG("consumer_thread_receive_fds received quit from signal"); | |
1192 | goto end; | |
1193 | } | |
1194 | DBG("received fds on sock"); | |
1195 | } | |
1196 | end: | |
1197 | DBG("consumer_thread_receive_fds exiting"); | |
1198 | ||
1199 | /* | |
1200 | * when all fds have hung up, the polling thread | |
1201 | * can exit cleanly | |
1202 | */ | |
1203 | consumer_quit = 1; | |
1204 | ||
1205 | /* | |
1206 | * 2s of grace period, if no polling events occur during | |
1207 | * this period, the polling thread will exit even if there | |
1208 | * are still open FDs (should not happen, but safety mechanism). | |
1209 | */ | |
1210 | consumer_poll_timeout = LTTNG_CONSUMER_POLL_TIMEOUT; | |
1211 | ||
1212 | /* wake up the polling thread */ | |
1213 | ret = write(ctx->consumer_poll_pipe[1], "4", 1); | |
1214 | if (ret < 0) { | |
1215 | perror("poll pipe write"); | |
1216 | } | |
e7b994a3 | 1217 | rcu_unregister_thread(); |
3bd1e081 MD |
1218 | return NULL; |
1219 | } | |
d41f73b7 | 1220 | |
f5204c94 | 1221 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
1222 | struct lttng_consumer_local_data *ctx) |
1223 | { | |
1224 | switch (consumer_data.type) { | |
1225 | case LTTNG_CONSUMER_KERNEL: | |
1226 | return lttng_kconsumer_read_subbuffer(stream, ctx); | |
7753dea8 MD |
1227 | case LTTNG_CONSUMER32_UST: |
1228 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
1229 | return lttng_ustconsumer_read_subbuffer(stream, ctx); |
1230 | default: | |
1231 | ERR("Unknown consumer_data type"); | |
1232 | assert(0); | |
1233 | return -ENOSYS; | |
1234 | } | |
1235 | } | |
1236 | ||
1237 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
1238 | { | |
1239 | switch (consumer_data.type) { | |
1240 | case LTTNG_CONSUMER_KERNEL: | |
1241 | return lttng_kconsumer_on_recv_stream(stream); | |
7753dea8 MD |
1242 | case LTTNG_CONSUMER32_UST: |
1243 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
1244 | return lttng_ustconsumer_on_recv_stream(stream); |
1245 | default: | |
1246 | ERR("Unknown consumer_data type"); | |
1247 | assert(0); | |
1248 | return -ENOSYS; | |
1249 | } | |
1250 | } | |
e4421fec DG |
1251 | |
1252 | /* | |
1253 | * Allocate and set consumer data hash tables. | |
1254 | */ | |
1255 | void lttng_consumer_init(void) | |
1256 | { | |
1257 | consumer_data.stream_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
1258 | consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
1259 | } | |
1260 |