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 | * | |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
3bd1e081 | 8 | * |
d14d33bf AM |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
3bd1e081 | 13 | * |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
3bd1e081 MD |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <assert.h> | |
3bd1e081 MD |
21 | #include <poll.h> |
22 | #include <pthread.h> | |
23 | #include <stdlib.h> | |
24 | #include <string.h> | |
25 | #include <sys/mman.h> | |
26 | #include <sys/socket.h> | |
27 | #include <sys/types.h> | |
28 | #include <unistd.h> | |
29 | ||
990570ed | 30 | #include <common/common.h> |
10a8a223 DG |
31 | #include <common/kernel-ctl/kernel-ctl.h> |
32 | #include <common/sessiond-comm/sessiond-comm.h> | |
33 | #include <common/kernel-consumer/kernel-consumer.h> | |
34 | #include <common/ust-consumer/ust-consumer.h> | |
35 | ||
36 | #include "consumer.h" | |
3bd1e081 MD |
37 | |
38 | struct lttng_consumer_global_data consumer_data = { | |
3bd1e081 MD |
39 | .stream_count = 0, |
40 | .need_update = 1, | |
41 | .type = LTTNG_CONSUMER_UNKNOWN, | |
42 | }; | |
43 | ||
44 | /* timeout parameter, to control the polling thread grace period. */ | |
45 | int consumer_poll_timeout = -1; | |
46 | ||
47 | /* | |
48 | * Flag to inform the polling thread to quit when all fd hung up. Updated by | |
49 | * the consumer_thread_receive_fds when it notices that all fds has hung up. | |
50 | * Also updated by the signal handler (consumer_should_exit()). Read by the | |
51 | * polling threads. | |
52 | */ | |
53 | volatile int consumer_quit = 0; | |
54 | ||
55 | /* | |
56 | * Find a stream. The consumer_data.lock must be locked during this | |
57 | * call. | |
58 | */ | |
59 | static struct lttng_consumer_stream *consumer_find_stream(int key) | |
60 | { | |
e4421fec DG |
61 | struct lttng_ht_iter iter; |
62 | struct lttng_ht_node_ulong *node; | |
63 | struct lttng_consumer_stream *stream = NULL; | |
3bd1e081 | 64 | |
7ad0a0cb MD |
65 | /* Negative keys are lookup failures */ |
66 | if (key < 0) | |
67 | return NULL; | |
e4421fec | 68 | |
6065ceec DG |
69 | rcu_read_lock(); |
70 | ||
e4421fec DG |
71 | lttng_ht_lookup(consumer_data.stream_ht, (void *)((unsigned long) key), |
72 | &iter); | |
73 | node = lttng_ht_iter_get_node_ulong(&iter); | |
74 | if (node != NULL) { | |
75 | stream = caa_container_of(node, struct lttng_consumer_stream, node); | |
3bd1e081 | 76 | } |
e4421fec | 77 | |
6065ceec DG |
78 | rcu_read_unlock(); |
79 | ||
e4421fec | 80 | return stream; |
3bd1e081 MD |
81 | } |
82 | ||
7ad0a0cb MD |
83 | static void consumer_steal_stream_key(int key) |
84 | { | |
85 | struct lttng_consumer_stream *stream; | |
86 | ||
04253271 | 87 | rcu_read_lock(); |
7ad0a0cb | 88 | stream = consumer_find_stream(key); |
04253271 | 89 | if (stream) { |
7ad0a0cb | 90 | stream->key = -1; |
04253271 MD |
91 | /* |
92 | * We don't want the lookup to match, but we still need | |
93 | * to iterate on this stream when iterating over the hash table. Just | |
94 | * change the node key. | |
95 | */ | |
96 | stream->node.key = -1; | |
97 | } | |
98 | rcu_read_unlock(); | |
7ad0a0cb MD |
99 | } |
100 | ||
3bd1e081 MD |
101 | static struct lttng_consumer_channel *consumer_find_channel(int key) |
102 | { | |
e4421fec DG |
103 | struct lttng_ht_iter iter; |
104 | struct lttng_ht_node_ulong *node; | |
105 | struct lttng_consumer_channel *channel = NULL; | |
3bd1e081 | 106 | |
7ad0a0cb MD |
107 | /* Negative keys are lookup failures */ |
108 | if (key < 0) | |
109 | return NULL; | |
e4421fec | 110 | |
6065ceec DG |
111 | rcu_read_lock(); |
112 | ||
e4421fec DG |
113 | lttng_ht_lookup(consumer_data.channel_ht, (void *)((unsigned long) key), |
114 | &iter); | |
115 | node = lttng_ht_iter_get_node_ulong(&iter); | |
116 | if (node != NULL) { | |
117 | channel = caa_container_of(node, struct lttng_consumer_channel, node); | |
3bd1e081 | 118 | } |
e4421fec | 119 | |
6065ceec DG |
120 | rcu_read_unlock(); |
121 | ||
e4421fec | 122 | return channel; |
3bd1e081 MD |
123 | } |
124 | ||
7ad0a0cb MD |
125 | static void consumer_steal_channel_key(int key) |
126 | { | |
127 | struct lttng_consumer_channel *channel; | |
128 | ||
04253271 | 129 | rcu_read_lock(); |
7ad0a0cb | 130 | channel = consumer_find_channel(key); |
04253271 | 131 | if (channel) { |
7ad0a0cb | 132 | channel->key = -1; |
04253271 MD |
133 | /* |
134 | * We don't want the lookup to match, but we still need | |
135 | * to iterate on this channel when iterating over the hash table. Just | |
136 | * change the node key. | |
137 | */ | |
138 | channel->node.key = -1; | |
139 | } | |
140 | rcu_read_unlock(); | |
7ad0a0cb MD |
141 | } |
142 | ||
702b1ea4 MD |
143 | static |
144 | void consumer_free_stream(struct rcu_head *head) | |
145 | { | |
146 | struct lttng_ht_node_ulong *node = | |
147 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
148 | struct lttng_consumer_stream *stream = | |
149 | caa_container_of(node, struct lttng_consumer_stream, node); | |
150 | ||
151 | free(stream); | |
152 | } | |
153 | ||
3bd1e081 MD |
154 | /* |
155 | * Remove a stream from the global list protected by a mutex. This | |
156 | * function is also responsible for freeing its data structures. | |
157 | */ | |
158 | void consumer_del_stream(struct lttng_consumer_stream *stream) | |
159 | { | |
160 | int ret; | |
e4421fec | 161 | struct lttng_ht_iter iter; |
3bd1e081 MD |
162 | struct lttng_consumer_channel *free_chan = NULL; |
163 | ||
164 | pthread_mutex_lock(&consumer_data.lock); | |
165 | ||
166 | switch (consumer_data.type) { | |
167 | case LTTNG_CONSUMER_KERNEL: | |
168 | if (stream->mmap_base != NULL) { | |
169 | ret = munmap(stream->mmap_base, stream->mmap_len); | |
170 | if (ret != 0) { | |
171 | perror("munmap"); | |
172 | } | |
173 | } | |
174 | break; | |
7753dea8 MD |
175 | case LTTNG_CONSUMER32_UST: |
176 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
177 | lttng_ustconsumer_del_stream(stream); |
178 | break; | |
179 | default: | |
180 | ERR("Unknown consumer_data type"); | |
181 | assert(0); | |
182 | goto end; | |
183 | } | |
184 | ||
6065ceec | 185 | rcu_read_lock(); |
04253271 MD |
186 | iter.iter.node = &stream->node.node; |
187 | ret = lttng_ht_del(consumer_data.stream_ht, &iter); | |
188 | assert(!ret); | |
e4421fec | 189 | |
6065ceec DG |
190 | rcu_read_unlock(); |
191 | ||
3bd1e081 MD |
192 | if (consumer_data.stream_count <= 0) { |
193 | goto end; | |
194 | } | |
195 | consumer_data.stream_count--; | |
196 | if (!stream) { | |
197 | goto end; | |
198 | } | |
199 | if (stream->out_fd >= 0) { | |
4c462e79 MD |
200 | ret = close(stream->out_fd); |
201 | if (ret) { | |
202 | PERROR("close"); | |
203 | } | |
3bd1e081 | 204 | } |
b5c5fc29 | 205 | if (stream->wait_fd >= 0 && !stream->wait_fd_is_copy) { |
4c462e79 MD |
206 | ret = close(stream->wait_fd); |
207 | if (ret) { | |
208 | PERROR("close"); | |
209 | } | |
3bd1e081 | 210 | } |
2c1dd183 | 211 | if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) { |
4c462e79 MD |
212 | ret = close(stream->shm_fd); |
213 | if (ret) { | |
214 | PERROR("close"); | |
215 | } | |
3bd1e081 MD |
216 | } |
217 | if (!--stream->chan->refcount) | |
218 | free_chan = stream->chan; | |
702b1ea4 MD |
219 | |
220 | call_rcu(&stream->node.head, consumer_free_stream); | |
3bd1e081 MD |
221 | end: |
222 | consumer_data.need_update = 1; | |
223 | pthread_mutex_unlock(&consumer_data.lock); | |
224 | ||
225 | if (free_chan) | |
226 | consumer_del_channel(free_chan); | |
227 | } | |
228 | ||
229 | struct lttng_consumer_stream *consumer_allocate_stream( | |
230 | int channel_key, int stream_key, | |
231 | int shm_fd, int wait_fd, | |
232 | enum lttng_consumer_stream_state state, | |
233 | uint64_t mmap_len, | |
234 | enum lttng_event_output output, | |
6df2e2c9 MD |
235 | const char *path_name, |
236 | uid_t uid, | |
237 | gid_t gid) | |
3bd1e081 MD |
238 | { |
239 | struct lttng_consumer_stream *stream; | |
240 | int ret; | |
241 | ||
effcf122 | 242 | stream = zmalloc(sizeof(*stream)); |
3bd1e081 MD |
243 | if (stream == NULL) { |
244 | perror("malloc struct lttng_consumer_stream"); | |
245 | goto end; | |
246 | } | |
247 | stream->chan = consumer_find_channel(channel_key); | |
248 | if (!stream->chan) { | |
249 | perror("Unable to find channel key"); | |
250 | goto end; | |
251 | } | |
252 | stream->chan->refcount++; | |
253 | stream->key = stream_key; | |
254 | stream->shm_fd = shm_fd; | |
255 | stream->wait_fd = wait_fd; | |
256 | stream->out_fd = -1; | |
257 | stream->out_fd_offset = 0; | |
258 | stream->state = state; | |
259 | stream->mmap_len = mmap_len; | |
260 | stream->mmap_base = NULL; | |
261 | stream->output = output; | |
6df2e2c9 MD |
262 | stream->uid = uid; |
263 | stream->gid = gid; | |
3bd1e081 MD |
264 | strncpy(stream->path_name, path_name, PATH_MAX - 1); |
265 | stream->path_name[PATH_MAX - 1] = '\0'; | |
e4421fec | 266 | lttng_ht_node_init_ulong(&stream->node, stream->key); |
3bd1e081 MD |
267 | |
268 | switch (consumer_data.type) { | |
269 | case LTTNG_CONSUMER_KERNEL: | |
270 | break; | |
7753dea8 MD |
271 | case LTTNG_CONSUMER32_UST: |
272 | case LTTNG_CONSUMER64_UST: | |
5af2f756 | 273 | stream->cpu = stream->chan->cpucount++; |
3bd1e081 MD |
274 | ret = lttng_ustconsumer_allocate_stream(stream); |
275 | if (ret) { | |
276 | free(stream); | |
277 | return NULL; | |
278 | } | |
279 | break; | |
280 | default: | |
281 | ERR("Unknown consumer_data type"); | |
282 | assert(0); | |
283 | goto end; | |
284 | } | |
285 | DBG("Allocated stream %s (key %d, shm_fd %d, wait_fd %d, mmap_len %llu, out_fd %d)", | |
286 | stream->path_name, stream->key, | |
287 | stream->shm_fd, | |
288 | stream->wait_fd, | |
289 | (unsigned long long) stream->mmap_len, | |
290 | stream->out_fd); | |
291 | end: | |
292 | return stream; | |
293 | } | |
294 | ||
295 | /* | |
296 | * Add a stream to the global list protected by a mutex. | |
297 | */ | |
298 | int consumer_add_stream(struct lttng_consumer_stream *stream) | |
299 | { | |
300 | int ret = 0; | |
c77fc10a DG |
301 | struct lttng_ht_node_ulong *node; |
302 | struct lttng_ht_iter iter; | |
3bd1e081 MD |
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(); |
c77fc10a DG |
308 | |
309 | lttng_ht_lookup(consumer_data.stream_ht, | |
310 | (void *)((unsigned long) stream->key), &iter); | |
311 | node = lttng_ht_iter_get_node_ulong(&iter); | |
312 | if (node != NULL) { | |
313 | rcu_read_unlock(); | |
314 | /* Stream already exist. Ignore the insertion */ | |
315 | goto end; | |
316 | } | |
317 | ||
04253271 | 318 | lttng_ht_add_unique_ulong(consumer_data.stream_ht, &stream->node); |
6065ceec | 319 | rcu_read_unlock(); |
3bd1e081 MD |
320 | consumer_data.stream_count++; |
321 | consumer_data.need_update = 1; | |
322 | ||
323 | switch (consumer_data.type) { | |
324 | case LTTNG_CONSUMER_KERNEL: | |
325 | break; | |
7753dea8 MD |
326 | case LTTNG_CONSUMER32_UST: |
327 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
328 | /* Streams are in CPU number order (we rely on this) */ |
329 | stream->cpu = stream->chan->nr_streams++; | |
330 | break; | |
331 | default: | |
332 | ERR("Unknown consumer_data type"); | |
333 | assert(0); | |
334 | goto end; | |
335 | } | |
336 | ||
337 | end: | |
338 | pthread_mutex_unlock(&consumer_data.lock); | |
702b1ea4 | 339 | |
3bd1e081 MD |
340 | return ret; |
341 | } | |
342 | ||
343 | /* | |
344 | * Update a stream according to what we just received. | |
345 | */ | |
346 | void consumer_change_stream_state(int stream_key, | |
347 | enum lttng_consumer_stream_state state) | |
348 | { | |
349 | struct lttng_consumer_stream *stream; | |
350 | ||
351 | pthread_mutex_lock(&consumer_data.lock); | |
352 | stream = consumer_find_stream(stream_key); | |
353 | if (stream) { | |
354 | stream->state = state; | |
355 | } | |
356 | consumer_data.need_update = 1; | |
357 | pthread_mutex_unlock(&consumer_data.lock); | |
358 | } | |
359 | ||
702b1ea4 MD |
360 | static |
361 | void consumer_free_channel(struct rcu_head *head) | |
362 | { | |
363 | struct lttng_ht_node_ulong *node = | |
364 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
365 | struct lttng_consumer_channel *channel = | |
366 | caa_container_of(node, struct lttng_consumer_channel, node); | |
367 | ||
368 | free(channel); | |
369 | } | |
370 | ||
3bd1e081 MD |
371 | /* |
372 | * Remove a channel from the global list protected by a mutex. This | |
373 | * function is also responsible for freeing its data structures. | |
374 | */ | |
375 | void consumer_del_channel(struct lttng_consumer_channel *channel) | |
376 | { | |
377 | int ret; | |
e4421fec | 378 | struct lttng_ht_iter iter; |
3bd1e081 MD |
379 | |
380 | pthread_mutex_lock(&consumer_data.lock); | |
381 | ||
382 | switch (consumer_data.type) { | |
383 | case LTTNG_CONSUMER_KERNEL: | |
384 | break; | |
7753dea8 MD |
385 | case LTTNG_CONSUMER32_UST: |
386 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
387 | lttng_ustconsumer_del_channel(channel); |
388 | break; | |
389 | default: | |
390 | ERR("Unknown consumer_data type"); | |
391 | assert(0); | |
392 | goto end; | |
393 | } | |
394 | ||
6065ceec | 395 | rcu_read_lock(); |
04253271 MD |
396 | iter.iter.node = &channel->node.node; |
397 | ret = lttng_ht_del(consumer_data.channel_ht, &iter); | |
398 | assert(!ret); | |
6065ceec DG |
399 | rcu_read_unlock(); |
400 | ||
3bd1e081 MD |
401 | if (channel->mmap_base != NULL) { |
402 | ret = munmap(channel->mmap_base, channel->mmap_len); | |
403 | if (ret != 0) { | |
404 | perror("munmap"); | |
405 | } | |
406 | } | |
b5c5fc29 | 407 | if (channel->wait_fd >= 0 && !channel->wait_fd_is_copy) { |
4c462e79 MD |
408 | ret = close(channel->wait_fd); |
409 | if (ret) { | |
410 | PERROR("close"); | |
411 | } | |
3bd1e081 | 412 | } |
2c1dd183 | 413 | if (channel->shm_fd >= 0 && channel->wait_fd != channel->shm_fd) { |
4c462e79 MD |
414 | ret = close(channel->shm_fd); |
415 | if (ret) { | |
416 | PERROR("close"); | |
417 | } | |
3bd1e081 | 418 | } |
702b1ea4 MD |
419 | |
420 | call_rcu(&channel->node.head, consumer_free_channel); | |
3bd1e081 MD |
421 | end: |
422 | pthread_mutex_unlock(&consumer_data.lock); | |
423 | } | |
424 | ||
425 | struct lttng_consumer_channel *consumer_allocate_channel( | |
426 | int channel_key, | |
427 | int shm_fd, int wait_fd, | |
428 | uint64_t mmap_len, | |
429 | uint64_t max_sb_size) | |
430 | { | |
431 | struct lttng_consumer_channel *channel; | |
432 | int ret; | |
433 | ||
276b26d1 | 434 | channel = zmalloc(sizeof(*channel)); |
3bd1e081 MD |
435 | if (channel == NULL) { |
436 | perror("malloc struct lttng_consumer_channel"); | |
437 | goto end; | |
438 | } | |
439 | channel->key = channel_key; | |
440 | channel->shm_fd = shm_fd; | |
441 | channel->wait_fd = wait_fd; | |
442 | channel->mmap_len = mmap_len; | |
443 | channel->max_sb_size = max_sb_size; | |
444 | channel->refcount = 0; | |
445 | channel->nr_streams = 0; | |
e4421fec | 446 | lttng_ht_node_init_ulong(&channel->node, channel->key); |
3bd1e081 MD |
447 | |
448 | switch (consumer_data.type) { | |
449 | case LTTNG_CONSUMER_KERNEL: | |
450 | channel->mmap_base = NULL; | |
451 | channel->mmap_len = 0; | |
452 | break; | |
7753dea8 MD |
453 | case LTTNG_CONSUMER32_UST: |
454 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
455 | ret = lttng_ustconsumer_allocate_channel(channel); |
456 | if (ret) { | |
457 | free(channel); | |
458 | return NULL; | |
459 | } | |
460 | break; | |
461 | default: | |
462 | ERR("Unknown consumer_data type"); | |
463 | assert(0); | |
464 | goto end; | |
465 | } | |
466 | DBG("Allocated channel (key %d, shm_fd %d, wait_fd %d, mmap_len %llu, max_sb_size %llu)", | |
467 | channel->key, | |
468 | channel->shm_fd, | |
469 | channel->wait_fd, | |
470 | (unsigned long long) channel->mmap_len, | |
471 | (unsigned long long) channel->max_sb_size); | |
472 | end: | |
473 | return channel; | |
474 | } | |
475 | ||
476 | /* | |
477 | * Add a channel to the global list protected by a mutex. | |
478 | */ | |
479 | int consumer_add_channel(struct lttng_consumer_channel *channel) | |
480 | { | |
c77fc10a DG |
481 | struct lttng_ht_node_ulong *node; |
482 | struct lttng_ht_iter iter; | |
483 | ||
3bd1e081 | 484 | pthread_mutex_lock(&consumer_data.lock); |
7ad0a0cb MD |
485 | /* Steal channel identifier, for UST */ |
486 | consumer_steal_channel_key(channel->key); | |
6065ceec | 487 | rcu_read_lock(); |
c77fc10a DG |
488 | |
489 | lttng_ht_lookup(consumer_data.channel_ht, | |
490 | (void *)((unsigned long) channel->key), &iter); | |
491 | node = lttng_ht_iter_get_node_ulong(&iter); | |
492 | if (node != NULL) { | |
493 | /* Channel already exist. Ignore the insertion */ | |
494 | goto end; | |
495 | } | |
496 | ||
04253271 | 497 | lttng_ht_add_unique_ulong(consumer_data.channel_ht, &channel->node); |
c77fc10a DG |
498 | |
499 | end: | |
6065ceec | 500 | rcu_read_unlock(); |
3bd1e081 | 501 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 502 | |
7ad0a0cb | 503 | return 0; |
3bd1e081 MD |
504 | } |
505 | ||
506 | /* | |
507 | * Allocate the pollfd structure and the local view of the out fds to avoid | |
508 | * doing a lookup in the linked list and concurrency issues when writing is | |
509 | * needed. Called with consumer_data.lock held. | |
510 | * | |
511 | * Returns the number of fds in the structures. | |
512 | */ | |
513 | int consumer_update_poll_array( | |
514 | struct lttng_consumer_local_data *ctx, struct pollfd **pollfd, | |
515 | struct lttng_consumer_stream **local_stream) | |
516 | { | |
3bd1e081 | 517 | int i = 0; |
e4421fec DG |
518 | struct lttng_ht_iter iter; |
519 | struct lttng_consumer_stream *stream; | |
3bd1e081 MD |
520 | |
521 | DBG("Updating poll fd array"); | |
481d6c57 | 522 | rcu_read_lock(); |
e4421fec DG |
523 | cds_lfht_for_each_entry(consumer_data.stream_ht->ht, &iter.iter, stream, |
524 | node.node) { | |
525 | if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM) { | |
3bd1e081 MD |
526 | continue; |
527 | } | |
e4421fec DG |
528 | DBG("Active FD %d", stream->wait_fd); |
529 | (*pollfd)[i].fd = stream->wait_fd; | |
3bd1e081 | 530 | (*pollfd)[i].events = POLLIN | POLLPRI; |
e4421fec | 531 | local_stream[i] = stream; |
3bd1e081 MD |
532 | i++; |
533 | } | |
481d6c57 | 534 | rcu_read_unlock(); |
3bd1e081 MD |
535 | |
536 | /* | |
537 | * Insert the consumer_poll_pipe at the end of the array and don't | |
538 | * increment i so nb_fd is the number of real FD. | |
539 | */ | |
540 | (*pollfd)[i].fd = ctx->consumer_poll_pipe[0]; | |
509bb1cf | 541 | (*pollfd)[i].events = POLLIN | POLLPRI; |
3bd1e081 MD |
542 | return i; |
543 | } | |
544 | ||
545 | /* | |
546 | * Poll on the should_quit pipe and the command socket return -1 on error and | |
547 | * should exit, 0 if data is available on the command socket | |
548 | */ | |
549 | int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll) | |
550 | { | |
551 | int num_rdy; | |
552 | ||
88f2b785 | 553 | restart: |
3bd1e081 MD |
554 | num_rdy = poll(consumer_sockpoll, 2, -1); |
555 | if (num_rdy == -1) { | |
88f2b785 MD |
556 | /* |
557 | * Restart interrupted system call. | |
558 | */ | |
559 | if (errno == EINTR) { | |
560 | goto restart; | |
561 | } | |
3bd1e081 MD |
562 | perror("Poll error"); |
563 | goto exit; | |
564 | } | |
509bb1cf | 565 | if (consumer_sockpoll[0].revents & (POLLIN | POLLPRI)) { |
3bd1e081 MD |
566 | DBG("consumer_should_quit wake up"); |
567 | goto exit; | |
568 | } | |
569 | return 0; | |
570 | ||
571 | exit: | |
572 | return -1; | |
573 | } | |
574 | ||
575 | /* | |
576 | * Set the error socket. | |
577 | */ | |
578 | void lttng_consumer_set_error_sock( | |
579 | struct lttng_consumer_local_data *ctx, int sock) | |
580 | { | |
581 | ctx->consumer_error_socket = sock; | |
582 | } | |
583 | ||
584 | /* | |
585 | * Set the command socket path. | |
586 | */ | |
587 | ||
588 | void lttng_consumer_set_command_sock_path( | |
589 | struct lttng_consumer_local_data *ctx, char *sock) | |
590 | { | |
591 | ctx->consumer_command_sock_path = sock; | |
592 | } | |
593 | ||
594 | /* | |
595 | * Send return code to the session daemon. | |
596 | * If the socket is not defined, we return 0, it is not a fatal error | |
597 | */ | |
598 | int lttng_consumer_send_error( | |
599 | struct lttng_consumer_local_data *ctx, int cmd) | |
600 | { | |
601 | if (ctx->consumer_error_socket > 0) { | |
602 | return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd, | |
603 | sizeof(enum lttcomm_sessiond_command)); | |
604 | } | |
605 | ||
606 | return 0; | |
607 | } | |
608 | ||
609 | /* | |
610 | * Close all the tracefiles and stream fds, should be called when all instances | |
611 | * are destroyed. | |
612 | */ | |
613 | void lttng_consumer_cleanup(void) | |
614 | { | |
e4421fec | 615 | struct lttng_ht_iter iter; |
6065ceec DG |
616 | struct lttng_ht_node_ulong *node; |
617 | ||
618 | rcu_read_lock(); | |
3bd1e081 MD |
619 | |
620 | /* | |
6065ceec DG |
621 | * close all outfd. Called when there are no more threads running (after |
622 | * joining on the threads), no need to protect list iteration with mutex. | |
3bd1e081 | 623 | */ |
6065ceec DG |
624 | cds_lfht_for_each_entry(consumer_data.stream_ht->ht, &iter.iter, node, |
625 | node) { | |
702b1ea4 MD |
626 | struct lttng_consumer_stream *stream = |
627 | caa_container_of(node, struct lttng_consumer_stream, node); | |
628 | consumer_del_stream(stream); | |
3bd1e081 | 629 | } |
e4421fec | 630 | |
6065ceec DG |
631 | cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, node, |
632 | node) { | |
702b1ea4 MD |
633 | struct lttng_consumer_channel *channel = |
634 | caa_container_of(node, struct lttng_consumer_channel, node); | |
635 | consumer_del_channel(channel); | |
3bd1e081 | 636 | } |
6065ceec DG |
637 | |
638 | rcu_read_unlock(); | |
d6ce1df2 MD |
639 | |
640 | lttng_ht_destroy(consumer_data.stream_ht); | |
641 | lttng_ht_destroy(consumer_data.channel_ht); | |
3bd1e081 MD |
642 | } |
643 | ||
644 | /* | |
645 | * Called from signal handler. | |
646 | */ | |
647 | void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx) | |
648 | { | |
649 | int ret; | |
650 | consumer_quit = 1; | |
651 | ret = write(ctx->consumer_should_quit[1], "4", 1); | |
652 | if (ret < 0) { | |
653 | perror("write consumer quit"); | |
654 | } | |
655 | } | |
656 | ||
657 | void lttng_consumer_sync_trace_file( | |
658 | struct lttng_consumer_stream *stream, off_t orig_offset) | |
659 | { | |
660 | int outfd = stream->out_fd; | |
661 | ||
662 | /* | |
663 | * This does a blocking write-and-wait on any page that belongs to the | |
664 | * subbuffer prior to the one we just wrote. | |
665 | * Don't care about error values, as these are just hints and ways to | |
666 | * limit the amount of page cache used. | |
667 | */ | |
668 | if (orig_offset < stream->chan->max_sb_size) { | |
669 | return; | |
670 | } | |
b9182dd9 | 671 | lttng_sync_file_range(outfd, orig_offset - stream->chan->max_sb_size, |
3bd1e081 MD |
672 | stream->chan->max_sb_size, |
673 | SYNC_FILE_RANGE_WAIT_BEFORE | |
674 | | SYNC_FILE_RANGE_WRITE | |
675 | | SYNC_FILE_RANGE_WAIT_AFTER); | |
676 | /* | |
677 | * Give hints to the kernel about how we access the file: | |
678 | * POSIX_FADV_DONTNEED : we won't re-access data in a near future after | |
679 | * we write it. | |
680 | * | |
681 | * We need to call fadvise again after the file grows because the | |
682 | * kernel does not seem to apply fadvise to non-existing parts of the | |
683 | * file. | |
684 | * | |
685 | * Call fadvise _after_ having waited for the page writeback to | |
686 | * complete because the dirty page writeback semantic is not well | |
687 | * defined. So it can be expected to lead to lower throughput in | |
688 | * streaming. | |
689 | */ | |
690 | posix_fadvise(outfd, orig_offset - stream->chan->max_sb_size, | |
691 | stream->chan->max_sb_size, POSIX_FADV_DONTNEED); | |
692 | } | |
693 | ||
694 | /* | |
695 | * Initialise the necessary environnement : | |
696 | * - create a new context | |
697 | * - create the poll_pipe | |
698 | * - create the should_quit pipe (for signal handler) | |
699 | * - create the thread pipe (for splice) | |
700 | * | |
701 | * Takes a function pointer as argument, this function is called when data is | |
702 | * available on a buffer. This function is responsible to do the | |
703 | * kernctl_get_next_subbuf, read the data with mmap or splice depending on the | |
704 | * buffer configuration and then kernctl_put_next_subbuf at the end. | |
705 | * | |
706 | * Returns a pointer to the new context or NULL on error. | |
707 | */ | |
708 | struct lttng_consumer_local_data *lttng_consumer_create( | |
709 | enum lttng_consumer_type type, | |
4078b776 | 710 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
d41f73b7 | 711 | struct lttng_consumer_local_data *ctx), |
3bd1e081 MD |
712 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
713 | int (*recv_stream)(struct lttng_consumer_stream *stream), | |
714 | int (*update_stream)(int stream_key, uint32_t state)) | |
715 | { | |
716 | int ret, i; | |
717 | struct lttng_consumer_local_data *ctx; | |
718 | ||
719 | assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN || | |
720 | consumer_data.type == type); | |
721 | consumer_data.type = type; | |
722 | ||
effcf122 | 723 | ctx = zmalloc(sizeof(struct lttng_consumer_local_data)); |
3bd1e081 MD |
724 | if (ctx == NULL) { |
725 | perror("allocating context"); | |
726 | goto error; | |
727 | } | |
728 | ||
729 | ctx->consumer_error_socket = -1; | |
730 | /* assign the callbacks */ | |
731 | ctx->on_buffer_ready = buffer_ready; | |
732 | ctx->on_recv_channel = recv_channel; | |
733 | ctx->on_recv_stream = recv_stream; | |
734 | ctx->on_update_stream = update_stream; | |
735 | ||
736 | ret = pipe(ctx->consumer_poll_pipe); | |
737 | if (ret < 0) { | |
738 | perror("Error creating poll pipe"); | |
739 | goto error_poll_pipe; | |
740 | } | |
741 | ||
04fdd819 MD |
742 | /* set read end of the pipe to non-blocking */ |
743 | ret = fcntl(ctx->consumer_poll_pipe[0], F_SETFL, O_NONBLOCK); | |
744 | if (ret < 0) { | |
745 | perror("fcntl O_NONBLOCK"); | |
746 | goto error_poll_fcntl; | |
747 | } | |
748 | ||
749 | /* set write end of the pipe to non-blocking */ | |
750 | ret = fcntl(ctx->consumer_poll_pipe[1], F_SETFL, O_NONBLOCK); | |
751 | if (ret < 0) { | |
752 | perror("fcntl O_NONBLOCK"); | |
753 | goto error_poll_fcntl; | |
754 | } | |
755 | ||
3bd1e081 MD |
756 | ret = pipe(ctx->consumer_should_quit); |
757 | if (ret < 0) { | |
758 | perror("Error creating recv pipe"); | |
759 | goto error_quit_pipe; | |
760 | } | |
761 | ||
762 | ret = pipe(ctx->consumer_thread_pipe); | |
763 | if (ret < 0) { | |
764 | perror("Error creating thread pipe"); | |
765 | goto error_thread_pipe; | |
766 | } | |
767 | ||
768 | return ctx; | |
769 | ||
770 | ||
771 | error_thread_pipe: | |
772 | for (i = 0; i < 2; i++) { | |
773 | int err; | |
774 | ||
775 | err = close(ctx->consumer_should_quit[i]); | |
4c462e79 MD |
776 | if (err) { |
777 | PERROR("close"); | |
778 | } | |
3bd1e081 | 779 | } |
04fdd819 | 780 | error_poll_fcntl: |
3bd1e081 MD |
781 | error_quit_pipe: |
782 | for (i = 0; i < 2; i++) { | |
783 | int err; | |
784 | ||
785 | err = close(ctx->consumer_poll_pipe[i]); | |
4c462e79 MD |
786 | if (err) { |
787 | PERROR("close"); | |
788 | } | |
3bd1e081 MD |
789 | } |
790 | error_poll_pipe: | |
791 | free(ctx); | |
792 | error: | |
793 | return NULL; | |
794 | } | |
795 | ||
796 | /* | |
797 | * Close all fds associated with the instance and free the context. | |
798 | */ | |
799 | void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx) | |
800 | { | |
4c462e79 MD |
801 | int ret; |
802 | ||
803 | ret = close(ctx->consumer_error_socket); | |
804 | if (ret) { | |
805 | PERROR("close"); | |
806 | } | |
807 | ret = close(ctx->consumer_thread_pipe[0]); | |
808 | if (ret) { | |
809 | PERROR("close"); | |
810 | } | |
811 | ret = close(ctx->consumer_thread_pipe[1]); | |
812 | if (ret) { | |
813 | PERROR("close"); | |
814 | } | |
815 | ret = close(ctx->consumer_poll_pipe[0]); | |
816 | if (ret) { | |
817 | PERROR("close"); | |
818 | } | |
819 | ret = close(ctx->consumer_poll_pipe[1]); | |
820 | if (ret) { | |
821 | PERROR("close"); | |
822 | } | |
823 | ret = close(ctx->consumer_should_quit[0]); | |
824 | if (ret) { | |
825 | PERROR("close"); | |
826 | } | |
827 | ret = close(ctx->consumer_should_quit[1]); | |
828 | if (ret) { | |
829 | PERROR("close"); | |
830 | } | |
3bd1e081 MD |
831 | unlink(ctx->consumer_command_sock_path); |
832 | free(ctx); | |
833 | } | |
834 | ||
835 | /* | |
836 | * Mmap the ring buffer, read it and write the data to the tracefile. | |
837 | * | |
838 | * Returns the number of bytes written | |
839 | */ | |
4078b776 | 840 | ssize_t lttng_consumer_on_read_subbuffer_mmap( |
3bd1e081 MD |
841 | struct lttng_consumer_local_data *ctx, |
842 | struct lttng_consumer_stream *stream, unsigned long len) | |
843 | { | |
844 | switch (consumer_data.type) { | |
845 | case LTTNG_CONSUMER_KERNEL: | |
846 | return lttng_kconsumer_on_read_subbuffer_mmap(ctx, stream, len); | |
7753dea8 MD |
847 | case LTTNG_CONSUMER32_UST: |
848 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
849 | return lttng_ustconsumer_on_read_subbuffer_mmap(ctx, stream, len); |
850 | default: | |
851 | ERR("Unknown consumer_data type"); | |
852 | assert(0); | |
853 | } | |
b9182dd9 DG |
854 | |
855 | return 0; | |
3bd1e081 MD |
856 | } |
857 | ||
858 | /* | |
859 | * Splice the data from the ring buffer to the tracefile. | |
860 | * | |
861 | * Returns the number of bytes spliced. | |
862 | */ | |
4078b776 | 863 | ssize_t lttng_consumer_on_read_subbuffer_splice( |
3bd1e081 MD |
864 | struct lttng_consumer_local_data *ctx, |
865 | struct lttng_consumer_stream *stream, unsigned long len) | |
866 | { | |
867 | switch (consumer_data.type) { | |
868 | case LTTNG_CONSUMER_KERNEL: | |
869 | return lttng_kconsumer_on_read_subbuffer_splice(ctx, stream, len); | |
7753dea8 MD |
870 | case LTTNG_CONSUMER32_UST: |
871 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
872 | return -ENOSYS; |
873 | default: | |
874 | ERR("Unknown consumer_data type"); | |
875 | assert(0); | |
876 | return -ENOSYS; | |
877 | } | |
878 | ||
879 | } | |
880 | ||
881 | /* | |
882 | * Take a snapshot for a specific fd | |
883 | * | |
884 | * Returns 0 on success, < 0 on error | |
885 | */ | |
886 | int lttng_consumer_take_snapshot(struct lttng_consumer_local_data *ctx, | |
887 | struct lttng_consumer_stream *stream) | |
888 | { | |
889 | switch (consumer_data.type) { | |
890 | case LTTNG_CONSUMER_KERNEL: | |
891 | return lttng_kconsumer_take_snapshot(ctx, stream); | |
7753dea8 MD |
892 | case LTTNG_CONSUMER32_UST: |
893 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
894 | return lttng_ustconsumer_take_snapshot(ctx, stream); |
895 | default: | |
896 | ERR("Unknown consumer_data type"); | |
897 | assert(0); | |
898 | return -ENOSYS; | |
899 | } | |
900 | ||
901 | } | |
902 | ||
903 | /* | |
904 | * Get the produced position | |
905 | * | |
906 | * Returns 0 on success, < 0 on error | |
907 | */ | |
908 | int lttng_consumer_get_produced_snapshot( | |
909 | struct lttng_consumer_local_data *ctx, | |
910 | struct lttng_consumer_stream *stream, | |
911 | unsigned long *pos) | |
912 | { | |
913 | switch (consumer_data.type) { | |
914 | case LTTNG_CONSUMER_KERNEL: | |
915 | return lttng_kconsumer_get_produced_snapshot(ctx, stream, pos); | |
7753dea8 MD |
916 | case LTTNG_CONSUMER32_UST: |
917 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
918 | return lttng_ustconsumer_get_produced_snapshot(ctx, stream, pos); |
919 | default: | |
920 | ERR("Unknown consumer_data type"); | |
921 | assert(0); | |
922 | return -ENOSYS; | |
923 | } | |
924 | } | |
925 | ||
926 | int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, | |
927 | int sock, struct pollfd *consumer_sockpoll) | |
928 | { | |
929 | switch (consumer_data.type) { | |
930 | case LTTNG_CONSUMER_KERNEL: | |
931 | return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
7753dea8 MD |
932 | case LTTNG_CONSUMER32_UST: |
933 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
934 | return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll); |
935 | default: | |
936 | ERR("Unknown consumer_data type"); | |
937 | assert(0); | |
938 | return -ENOSYS; | |
939 | } | |
940 | } | |
941 | ||
942 | /* | |
e4421fec | 943 | * This thread polls the fds in the set to consume the data and write |
3bd1e081 MD |
944 | * it to tracefile if necessary. |
945 | */ | |
946 | void *lttng_consumer_thread_poll_fds(void *data) | |
947 | { | |
948 | int num_rdy, num_hup, high_prio, ret, i; | |
949 | struct pollfd *pollfd = NULL; | |
950 | /* local view of the streams */ | |
951 | struct lttng_consumer_stream **local_stream = NULL; | |
952 | /* local view of consumer_data.fds_count */ | |
953 | int nb_fd = 0; | |
3bd1e081 MD |
954 | struct lttng_consumer_local_data *ctx = data; |
955 | ||
e7b994a3 DG |
956 | rcu_register_thread(); |
957 | ||
effcf122 | 958 | local_stream = zmalloc(sizeof(struct lttng_consumer_stream)); |
3bd1e081 MD |
959 | |
960 | while (1) { | |
961 | high_prio = 0; | |
962 | num_hup = 0; | |
963 | ||
964 | /* | |
e4421fec | 965 | * the fds set has been updated, we need to update our |
3bd1e081 MD |
966 | * local array as well |
967 | */ | |
968 | pthread_mutex_lock(&consumer_data.lock); | |
969 | if (consumer_data.need_update) { | |
970 | if (pollfd != NULL) { | |
971 | free(pollfd); | |
972 | pollfd = NULL; | |
973 | } | |
974 | if (local_stream != NULL) { | |
975 | free(local_stream); | |
976 | local_stream = NULL; | |
977 | } | |
978 | ||
979 | /* allocate for all fds + 1 for the consumer_poll_pipe */ | |
effcf122 | 980 | pollfd = zmalloc((consumer_data.stream_count + 1) * sizeof(struct pollfd)); |
3bd1e081 MD |
981 | if (pollfd == NULL) { |
982 | perror("pollfd malloc"); | |
983 | pthread_mutex_unlock(&consumer_data.lock); | |
984 | goto end; | |
985 | } | |
986 | ||
987 | /* allocate for all fds + 1 for the consumer_poll_pipe */ | |
effcf122 | 988 | local_stream = zmalloc((consumer_data.stream_count + 1) * |
3bd1e081 MD |
989 | sizeof(struct lttng_consumer_stream)); |
990 | if (local_stream == NULL) { | |
991 | perror("local_stream malloc"); | |
992 | pthread_mutex_unlock(&consumer_data.lock); | |
993 | goto end; | |
994 | } | |
995 | ret = consumer_update_poll_array(ctx, &pollfd, local_stream); | |
996 | if (ret < 0) { | |
997 | ERR("Error in allocating pollfd or local_outfds"); | |
998 | lttng_consumer_send_error(ctx, CONSUMERD_POLL_ERROR); | |
999 | pthread_mutex_unlock(&consumer_data.lock); | |
1000 | goto end; | |
1001 | } | |
1002 | nb_fd = ret; | |
1003 | consumer_data.need_update = 0; | |
1004 | } | |
1005 | pthread_mutex_unlock(&consumer_data.lock); | |
1006 | ||
4078b776 MD |
1007 | /* No FDs and consumer_quit, consumer_cleanup the thread */ |
1008 | if (nb_fd == 0 && consumer_quit == 1) { | |
1009 | goto end; | |
1010 | } | |
3bd1e081 | 1011 | /* poll on the array of fds */ |
88f2b785 | 1012 | restart: |
3bd1e081 MD |
1013 | DBG("polling on %d fd", nb_fd + 1); |
1014 | num_rdy = poll(pollfd, nb_fd + 1, consumer_poll_timeout); | |
1015 | DBG("poll num_rdy : %d", num_rdy); | |
1016 | if (num_rdy == -1) { | |
88f2b785 MD |
1017 | /* |
1018 | * Restart interrupted system call. | |
1019 | */ | |
1020 | if (errno == EINTR) { | |
1021 | goto restart; | |
1022 | } | |
3bd1e081 MD |
1023 | perror("Poll error"); |
1024 | lttng_consumer_send_error(ctx, CONSUMERD_POLL_ERROR); | |
1025 | goto end; | |
1026 | } else if (num_rdy == 0) { | |
1027 | DBG("Polling thread timed out"); | |
1028 | goto end; | |
1029 | } | |
1030 | ||
3bd1e081 MD |
1031 | /* |
1032 | * If the consumer_poll_pipe triggered poll go | |
1033 | * directly to the beginning of the loop to update the | |
1034 | * array. We want to prioritize array update over | |
1035 | * low-priority reads. | |
1036 | */ | |
509bb1cf | 1037 | if (pollfd[nb_fd].revents & (POLLIN | POLLPRI)) { |
04fdd819 MD |
1038 | size_t pipe_readlen; |
1039 | char tmp; | |
1040 | ||
3bd1e081 | 1041 | DBG("consumer_poll_pipe wake up"); |
04fdd819 MD |
1042 | /* Consume 1 byte of pipe data */ |
1043 | do { | |
1044 | pipe_readlen = read(ctx->consumer_poll_pipe[0], &tmp, 1); | |
1045 | } while (pipe_readlen == -1 && errno == EINTR); | |
3bd1e081 MD |
1046 | continue; |
1047 | } | |
1048 | ||
1049 | /* Take care of high priority channels first. */ | |
1050 | for (i = 0; i < nb_fd; i++) { | |
d41f73b7 | 1051 | if (pollfd[i].revents & POLLPRI) { |
4078b776 MD |
1052 | ssize_t len; |
1053 | ||
d41f73b7 MD |
1054 | DBG("Urgent read on fd %d", pollfd[i].fd); |
1055 | high_prio = 1; | |
4078b776 | 1056 | len = ctx->on_buffer_ready(local_stream[i], ctx); |
d41f73b7 | 1057 | /* it's ok to have an unavailable sub-buffer */ |
4078b776 MD |
1058 | if (len < 0 && len != -EAGAIN) { |
1059 | goto end; | |
1060 | } else if (len > 0) { | |
1061 | local_stream[i]->data_read = 1; | |
d41f73b7 | 1062 | } |
3bd1e081 MD |
1063 | } |
1064 | } | |
1065 | ||
4078b776 MD |
1066 | /* |
1067 | * If we read high prio channel in this loop, try again | |
1068 | * for more high prio data. | |
1069 | */ | |
1070 | if (high_prio) { | |
3bd1e081 MD |
1071 | continue; |
1072 | } | |
1073 | ||
1074 | /* Take care of low priority channels. */ | |
4078b776 MD |
1075 | for (i = 0; i < nb_fd; i++) { |
1076 | if ((pollfd[i].revents & POLLIN) || | |
1077 | local_stream[i]->hangup_flush_done) { | |
1078 | ssize_t len; | |
1079 | ||
4078b776 MD |
1080 | DBG("Normal read on fd %d", pollfd[i].fd); |
1081 | len = ctx->on_buffer_ready(local_stream[i], ctx); | |
1082 | /* it's ok to have an unavailable sub-buffer */ | |
1083 | if (len < 0 && len != -EAGAIN) { | |
1084 | goto end; | |
1085 | } else if (len > 0) { | |
1086 | local_stream[i]->data_read = 1; | |
1087 | } | |
1088 | } | |
1089 | } | |
1090 | ||
1091 | /* Handle hangup and errors */ | |
1092 | for (i = 0; i < nb_fd; i++) { | |
1093 | if (!local_stream[i]->hangup_flush_done | |
1094 | && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL)) | |
1095 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
1096 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
1097 | DBG("fd %d is hup|err|nval. Attempting flush and read.", | |
1098 | pollfd[i].fd); | |
1099 | lttng_ustconsumer_on_stream_hangup(local_stream[i]); | |
1100 | /* Attempt read again, for the data we just flushed. */ | |
1101 | local_stream[i]->data_read = 1; | |
1102 | } | |
1103 | /* | |
1104 | * If the poll flag is HUP/ERR/NVAL and we have | |
1105 | * read no data in this pass, we can remove the | |
1106 | * stream from its hash table. | |
1107 | */ | |
1108 | if ((pollfd[i].revents & POLLHUP)) { | |
1109 | DBG("Polling fd %d tells it has hung up.", pollfd[i].fd); | |
1110 | if (!local_stream[i]->data_read) { | |
702b1ea4 | 1111 | consumer_del_stream(local_stream[i]); |
4078b776 MD |
1112 | num_hup++; |
1113 | } | |
1114 | } else if (pollfd[i].revents & POLLERR) { | |
1115 | ERR("Error returned in polling fd %d.", pollfd[i].fd); | |
1116 | if (!local_stream[i]->data_read) { | |
702b1ea4 | 1117 | consumer_del_stream(local_stream[i]); |
4078b776 MD |
1118 | num_hup++; |
1119 | } | |
1120 | } else if (pollfd[i].revents & POLLNVAL) { | |
1121 | ERR("Polling fd %d tells fd is not open.", pollfd[i].fd); | |
1122 | if (!local_stream[i]->data_read) { | |
702b1ea4 | 1123 | consumer_del_stream(local_stream[i]); |
4078b776 | 1124 | num_hup++; |
3bd1e081 MD |
1125 | } |
1126 | } | |
4078b776 | 1127 | local_stream[i]->data_read = 0; |
3bd1e081 MD |
1128 | } |
1129 | } | |
1130 | end: | |
1131 | DBG("polling thread exiting"); | |
1132 | if (pollfd != NULL) { | |
1133 | free(pollfd); | |
1134 | pollfd = NULL; | |
1135 | } | |
1136 | if (local_stream != NULL) { | |
1137 | free(local_stream); | |
1138 | local_stream = NULL; | |
1139 | } | |
e7b994a3 | 1140 | rcu_unregister_thread(); |
3bd1e081 MD |
1141 | return NULL; |
1142 | } | |
1143 | ||
1144 | /* | |
1145 | * This thread listens on the consumerd socket and receives the file | |
1146 | * descriptors from the session daemon. | |
1147 | */ | |
1148 | void *lttng_consumer_thread_receive_fds(void *data) | |
1149 | { | |
1150 | int sock, client_socket, ret; | |
1151 | /* | |
1152 | * structure to poll for incoming data on communication socket avoids | |
1153 | * making blocking sockets. | |
1154 | */ | |
1155 | struct pollfd consumer_sockpoll[2]; | |
1156 | struct lttng_consumer_local_data *ctx = data; | |
1157 | ||
e7b994a3 DG |
1158 | rcu_register_thread(); |
1159 | ||
3bd1e081 MD |
1160 | DBG("Creating command socket %s", ctx->consumer_command_sock_path); |
1161 | unlink(ctx->consumer_command_sock_path); | |
1162 | client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path); | |
1163 | if (client_socket < 0) { | |
1164 | ERR("Cannot create command socket"); | |
1165 | goto end; | |
1166 | } | |
1167 | ||
1168 | ret = lttcomm_listen_unix_sock(client_socket); | |
1169 | if (ret < 0) { | |
1170 | goto end; | |
1171 | } | |
1172 | ||
32258573 | 1173 | DBG("Sending ready command to lttng-sessiond"); |
3bd1e081 MD |
1174 | ret = lttng_consumer_send_error(ctx, CONSUMERD_COMMAND_SOCK_READY); |
1175 | /* return < 0 on error, but == 0 is not fatal */ | |
1176 | if (ret < 0) { | |
32258573 | 1177 | ERR("Error sending ready command to lttng-sessiond"); |
3bd1e081 MD |
1178 | goto end; |
1179 | } | |
1180 | ||
1181 | ret = fcntl(client_socket, F_SETFL, O_NONBLOCK); | |
1182 | if (ret < 0) { | |
1183 | perror("fcntl O_NONBLOCK"); | |
1184 | goto end; | |
1185 | } | |
1186 | ||
1187 | /* prepare the FDs to poll : to client socket and the should_quit pipe */ | |
1188 | consumer_sockpoll[0].fd = ctx->consumer_should_quit[0]; | |
1189 | consumer_sockpoll[0].events = POLLIN | POLLPRI; | |
1190 | consumer_sockpoll[1].fd = client_socket; | |
1191 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
1192 | ||
1193 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
1194 | goto end; | |
1195 | } | |
1196 | DBG("Connection on client_socket"); | |
1197 | ||
1198 | /* Blocking call, waiting for transmission */ | |
1199 | sock = lttcomm_accept_unix_sock(client_socket); | |
1200 | if (sock <= 0) { | |
1201 | WARN("On accept"); | |
1202 | goto end; | |
1203 | } | |
1204 | ret = fcntl(sock, F_SETFL, O_NONBLOCK); | |
1205 | if (ret < 0) { | |
1206 | perror("fcntl O_NONBLOCK"); | |
1207 | goto end; | |
1208 | } | |
1209 | ||
1210 | /* update the polling structure to poll on the established socket */ | |
1211 | consumer_sockpoll[1].fd = sock; | |
1212 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
1213 | ||
1214 | while (1) { | |
1215 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
1216 | goto end; | |
1217 | } | |
1218 | DBG("Incoming command on sock"); | |
1219 | ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
1220 | if (ret == -ENOENT) { | |
1221 | DBG("Received STOP command"); | |
1222 | goto end; | |
1223 | } | |
1224 | if (ret < 0) { | |
1225 | ERR("Communication interrupted on command socket"); | |
1226 | goto end; | |
1227 | } | |
1228 | if (consumer_quit) { | |
1229 | DBG("consumer_thread_receive_fds received quit from signal"); | |
1230 | goto end; | |
1231 | } | |
1232 | DBG("received fds on sock"); | |
1233 | } | |
1234 | end: | |
1235 | DBG("consumer_thread_receive_fds exiting"); | |
1236 | ||
1237 | /* | |
1238 | * when all fds have hung up, the polling thread | |
1239 | * can exit cleanly | |
1240 | */ | |
1241 | consumer_quit = 1; | |
1242 | ||
1243 | /* | |
1244 | * 2s of grace period, if no polling events occur during | |
1245 | * this period, the polling thread will exit even if there | |
1246 | * are still open FDs (should not happen, but safety mechanism). | |
1247 | */ | |
1248 | consumer_poll_timeout = LTTNG_CONSUMER_POLL_TIMEOUT; | |
1249 | ||
04fdd819 MD |
1250 | /* |
1251 | * Wake-up the other end by writing a null byte in the pipe | |
1252 | * (non-blocking). Important note: Because writing into the | |
1253 | * pipe is non-blocking (and therefore we allow dropping wakeup | |
1254 | * data, as long as there is wakeup data present in the pipe | |
1255 | * buffer to wake up the other end), the other end should | |
1256 | * perform the following sequence for waiting: | |
1257 | * 1) empty the pipe (reads). | |
1258 | * 2) perform update operation. | |
1259 | * 3) wait on the pipe (poll). | |
1260 | */ | |
1261 | do { | |
1262 | ret = write(ctx->consumer_poll_pipe[1], "", 1); | |
1263 | } while (ret == -1UL && errno == EINTR); | |
e7b994a3 | 1264 | rcu_unregister_thread(); |
3bd1e081 MD |
1265 | return NULL; |
1266 | } | |
d41f73b7 | 1267 | |
4078b776 | 1268 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
1269 | struct lttng_consumer_local_data *ctx) |
1270 | { | |
1271 | switch (consumer_data.type) { | |
1272 | case LTTNG_CONSUMER_KERNEL: | |
1273 | return lttng_kconsumer_read_subbuffer(stream, ctx); | |
7753dea8 MD |
1274 | case LTTNG_CONSUMER32_UST: |
1275 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
1276 | return lttng_ustconsumer_read_subbuffer(stream, ctx); |
1277 | default: | |
1278 | ERR("Unknown consumer_data type"); | |
1279 | assert(0); | |
1280 | return -ENOSYS; | |
1281 | } | |
1282 | } | |
1283 | ||
1284 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
1285 | { | |
1286 | switch (consumer_data.type) { | |
1287 | case LTTNG_CONSUMER_KERNEL: | |
1288 | return lttng_kconsumer_on_recv_stream(stream); | |
7753dea8 MD |
1289 | case LTTNG_CONSUMER32_UST: |
1290 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
1291 | return lttng_ustconsumer_on_recv_stream(stream); |
1292 | default: | |
1293 | ERR("Unknown consumer_data type"); | |
1294 | assert(0); | |
1295 | return -ENOSYS; | |
1296 | } | |
1297 | } | |
e4421fec DG |
1298 | |
1299 | /* | |
1300 | * Allocate and set consumer data hash tables. | |
1301 | */ | |
1302 | void lttng_consumer_init(void) | |
1303 | { | |
1304 | consumer_data.stream_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
1305 | consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
1306 | } | |
1307 |