Commit | Line | Data |
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3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License | |
7 | * as published by the Free Software Foundation; only version 2 | |
8 | * of the License. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
18 | */ | |
19 | ||
20 | #define _GNU_SOURCE | |
21 | #include <assert.h> | |
3bd1e081 MD |
22 | #include <poll.h> |
23 | #include <pthread.h> | |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | #include <sys/mman.h> | |
27 | #include <sys/socket.h> | |
28 | #include <sys/types.h> | |
29 | #include <unistd.h> | |
30 | ||
990570ed | 31 | #include <common/common.h> |
10a8a223 DG |
32 | #include <common/kernel-ctl/kernel-ctl.h> |
33 | #include <common/sessiond-comm/sessiond-comm.h> | |
34 | #include <common/kernel-consumer/kernel-consumer.h> | |
35 | #include <common/ust-consumer/ust-consumer.h> | |
36 | ||
37 | #include "consumer.h" | |
3bd1e081 MD |
38 | |
39 | struct lttng_consumer_global_data consumer_data = { | |
3bd1e081 MD |
40 | .stream_count = 0, |
41 | .need_update = 1, | |
42 | .type = LTTNG_CONSUMER_UNKNOWN, | |
43 | }; | |
44 | ||
45 | /* timeout parameter, to control the polling thread grace period. */ | |
46 | int consumer_poll_timeout = -1; | |
47 | ||
48 | /* | |
49 | * Flag to inform the polling thread to quit when all fd hung up. Updated by | |
50 | * the consumer_thread_receive_fds when it notices that all fds has hung up. | |
51 | * Also updated by the signal handler (consumer_should_exit()). Read by the | |
52 | * polling threads. | |
53 | */ | |
54 | volatile int consumer_quit = 0; | |
55 | ||
56 | /* | |
57 | * Find a stream. The consumer_data.lock must be locked during this | |
58 | * call. | |
59 | */ | |
60 | static struct lttng_consumer_stream *consumer_find_stream(int key) | |
61 | { | |
e4421fec DG |
62 | struct lttng_ht_iter iter; |
63 | struct lttng_ht_node_ulong *node; | |
64 | struct lttng_consumer_stream *stream = NULL; | |
3bd1e081 | 65 | |
7ad0a0cb MD |
66 | /* Negative keys are lookup failures */ |
67 | if (key < 0) | |
68 | return NULL; | |
e4421fec | 69 | |
6065ceec DG |
70 | rcu_read_lock(); |
71 | ||
e4421fec DG |
72 | lttng_ht_lookup(consumer_data.stream_ht, (void *)((unsigned long) key), |
73 | &iter); | |
74 | node = lttng_ht_iter_get_node_ulong(&iter); | |
75 | if (node != NULL) { | |
76 | stream = caa_container_of(node, struct lttng_consumer_stream, node); | |
3bd1e081 | 77 | } |
e4421fec | 78 | |
6065ceec DG |
79 | rcu_read_unlock(); |
80 | ||
e4421fec | 81 | return stream; |
3bd1e081 MD |
82 | } |
83 | ||
7ad0a0cb MD |
84 | static void consumer_steal_stream_key(int key) |
85 | { | |
86 | struct lttng_consumer_stream *stream; | |
87 | ||
88 | stream = consumer_find_stream(key); | |
89 | if (stream) | |
90 | stream->key = -1; | |
91 | } | |
92 | ||
3bd1e081 MD |
93 | static struct lttng_consumer_channel *consumer_find_channel(int key) |
94 | { | |
e4421fec DG |
95 | struct lttng_ht_iter iter; |
96 | struct lttng_ht_node_ulong *node; | |
97 | struct lttng_consumer_channel *channel = NULL; | |
3bd1e081 | 98 | |
7ad0a0cb MD |
99 | /* Negative keys are lookup failures */ |
100 | if (key < 0) | |
101 | return NULL; | |
e4421fec | 102 | |
6065ceec DG |
103 | rcu_read_lock(); |
104 | ||
e4421fec DG |
105 | lttng_ht_lookup(consumer_data.channel_ht, (void *)((unsigned long) key), |
106 | &iter); | |
107 | node = lttng_ht_iter_get_node_ulong(&iter); | |
108 | if (node != NULL) { | |
109 | channel = caa_container_of(node, struct lttng_consumer_channel, node); | |
3bd1e081 | 110 | } |
e4421fec | 111 | |
6065ceec DG |
112 | rcu_read_unlock(); |
113 | ||
e4421fec | 114 | return channel; |
3bd1e081 MD |
115 | } |
116 | ||
7ad0a0cb MD |
117 | static void consumer_steal_channel_key(int key) |
118 | { | |
119 | struct lttng_consumer_channel *channel; | |
120 | ||
121 | channel = consumer_find_channel(key); | |
122 | if (channel) | |
123 | channel->key = -1; | |
124 | } | |
125 | ||
3bd1e081 MD |
126 | /* |
127 | * Remove a stream from the global list protected by a mutex. This | |
128 | * function is also responsible for freeing its data structures. | |
129 | */ | |
130 | void consumer_del_stream(struct lttng_consumer_stream *stream) | |
131 | { | |
132 | int ret; | |
e4421fec | 133 | struct lttng_ht_iter iter; |
3bd1e081 MD |
134 | struct lttng_consumer_channel *free_chan = NULL; |
135 | ||
136 | pthread_mutex_lock(&consumer_data.lock); | |
137 | ||
138 | switch (consumer_data.type) { | |
139 | case LTTNG_CONSUMER_KERNEL: | |
140 | if (stream->mmap_base != NULL) { | |
141 | ret = munmap(stream->mmap_base, stream->mmap_len); | |
142 | if (ret != 0) { | |
143 | perror("munmap"); | |
144 | } | |
145 | } | |
146 | break; | |
7753dea8 MD |
147 | case LTTNG_CONSUMER32_UST: |
148 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
149 | lttng_ustconsumer_del_stream(stream); |
150 | break; | |
151 | default: | |
152 | ERR("Unknown consumer_data type"); | |
153 | assert(0); | |
154 | goto end; | |
155 | } | |
156 | ||
6065ceec DG |
157 | rcu_read_lock(); |
158 | ||
e4421fec DG |
159 | /* Get stream node from hash table */ |
160 | lttng_ht_lookup(consumer_data.stream_ht, | |
161 | (void *)((unsigned long) stream->key), &iter); | |
162 | /* Remove stream node from hash table */ | |
163 | ret = lttng_ht_del(consumer_data.stream_ht, &iter); | |
164 | assert(!ret); | |
165 | ||
6065ceec DG |
166 | rcu_read_unlock(); |
167 | ||
3bd1e081 MD |
168 | if (consumer_data.stream_count <= 0) { |
169 | goto end; | |
170 | } | |
171 | consumer_data.stream_count--; | |
172 | if (!stream) { | |
173 | goto end; | |
174 | } | |
175 | if (stream->out_fd >= 0) { | |
4c462e79 MD |
176 | ret = close(stream->out_fd); |
177 | if (ret) { | |
178 | PERROR("close"); | |
179 | } | |
3bd1e081 | 180 | } |
b5c5fc29 | 181 | if (stream->wait_fd >= 0 && !stream->wait_fd_is_copy) { |
4c462e79 MD |
182 | ret = close(stream->wait_fd); |
183 | if (ret) { | |
184 | PERROR("close"); | |
185 | } | |
3bd1e081 | 186 | } |
2c1dd183 | 187 | if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) { |
4c462e79 MD |
188 | ret = close(stream->shm_fd); |
189 | if (ret) { | |
190 | PERROR("close"); | |
191 | } | |
3bd1e081 MD |
192 | } |
193 | if (!--stream->chan->refcount) | |
194 | free_chan = stream->chan; | |
195 | free(stream); | |
196 | end: | |
197 | consumer_data.need_update = 1; | |
198 | pthread_mutex_unlock(&consumer_data.lock); | |
199 | ||
200 | if (free_chan) | |
201 | consumer_del_channel(free_chan); | |
202 | } | |
203 | ||
6065ceec DG |
204 | static void consumer_del_stream_rcu(struct rcu_head *head) |
205 | { | |
206 | struct lttng_ht_node_ulong *node = | |
207 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
208 | struct lttng_consumer_stream *stream = | |
209 | caa_container_of(node, struct lttng_consumer_stream, node); | |
210 | ||
211 | consumer_del_stream(stream); | |
212 | } | |
213 | ||
3bd1e081 MD |
214 | struct lttng_consumer_stream *consumer_allocate_stream( |
215 | int channel_key, int stream_key, | |
216 | int shm_fd, int wait_fd, | |
217 | enum lttng_consumer_stream_state state, | |
218 | uint64_t mmap_len, | |
219 | enum lttng_event_output output, | |
6df2e2c9 MD |
220 | const char *path_name, |
221 | uid_t uid, | |
222 | gid_t gid) | |
3bd1e081 MD |
223 | { |
224 | struct lttng_consumer_stream *stream; | |
225 | int ret; | |
226 | ||
effcf122 | 227 | stream = zmalloc(sizeof(*stream)); |
3bd1e081 MD |
228 | if (stream == NULL) { |
229 | perror("malloc struct lttng_consumer_stream"); | |
230 | goto end; | |
231 | } | |
232 | stream->chan = consumer_find_channel(channel_key); | |
233 | if (!stream->chan) { | |
234 | perror("Unable to find channel key"); | |
235 | goto end; | |
236 | } | |
237 | stream->chan->refcount++; | |
238 | stream->key = stream_key; | |
239 | stream->shm_fd = shm_fd; | |
240 | stream->wait_fd = wait_fd; | |
241 | stream->out_fd = -1; | |
242 | stream->out_fd_offset = 0; | |
243 | stream->state = state; | |
244 | stream->mmap_len = mmap_len; | |
245 | stream->mmap_base = NULL; | |
246 | stream->output = output; | |
6df2e2c9 MD |
247 | stream->uid = uid; |
248 | stream->gid = gid; | |
3bd1e081 MD |
249 | strncpy(stream->path_name, path_name, PATH_MAX - 1); |
250 | stream->path_name[PATH_MAX - 1] = '\0'; | |
e4421fec | 251 | lttng_ht_node_init_ulong(&stream->node, stream->key); |
3bd1e081 MD |
252 | |
253 | switch (consumer_data.type) { | |
254 | case LTTNG_CONSUMER_KERNEL: | |
255 | break; | |
7753dea8 MD |
256 | case LTTNG_CONSUMER32_UST: |
257 | case LTTNG_CONSUMER64_UST: | |
5af2f756 | 258 | stream->cpu = stream->chan->cpucount++; |
3bd1e081 MD |
259 | ret = lttng_ustconsumer_allocate_stream(stream); |
260 | if (ret) { | |
261 | free(stream); | |
262 | return NULL; | |
263 | } | |
264 | break; | |
265 | default: | |
266 | ERR("Unknown consumer_data type"); | |
267 | assert(0); | |
268 | goto end; | |
269 | } | |
270 | DBG("Allocated stream %s (key %d, shm_fd %d, wait_fd %d, mmap_len %llu, out_fd %d)", | |
271 | stream->path_name, stream->key, | |
272 | stream->shm_fd, | |
273 | stream->wait_fd, | |
274 | (unsigned long long) stream->mmap_len, | |
275 | stream->out_fd); | |
276 | end: | |
277 | return stream; | |
278 | } | |
279 | ||
280 | /* | |
281 | * Add a stream to the global list protected by a mutex. | |
282 | */ | |
283 | int consumer_add_stream(struct lttng_consumer_stream *stream) | |
284 | { | |
285 | int ret = 0; | |
286 | ||
287 | pthread_mutex_lock(&consumer_data.lock); | |
7ad0a0cb MD |
288 | /* Steal stream identifier, for UST */ |
289 | consumer_steal_stream_key(stream->key); | |
6065ceec | 290 | rcu_read_lock(); |
e4421fec | 291 | lttng_ht_add_unique_ulong(consumer_data.stream_ht, &stream->node); |
6065ceec | 292 | rcu_read_unlock(); |
3bd1e081 MD |
293 | consumer_data.stream_count++; |
294 | consumer_data.need_update = 1; | |
295 | ||
296 | switch (consumer_data.type) { | |
297 | case LTTNG_CONSUMER_KERNEL: | |
298 | break; | |
7753dea8 MD |
299 | case LTTNG_CONSUMER32_UST: |
300 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
301 | /* Streams are in CPU number order (we rely on this) */ |
302 | stream->cpu = stream->chan->nr_streams++; | |
303 | break; | |
304 | default: | |
305 | ERR("Unknown consumer_data type"); | |
306 | assert(0); | |
307 | goto end; | |
308 | } | |
309 | ||
310 | end: | |
311 | pthread_mutex_unlock(&consumer_data.lock); | |
312 | return ret; | |
313 | } | |
314 | ||
315 | /* | |
316 | * Update a stream according to what we just received. | |
317 | */ | |
318 | void consumer_change_stream_state(int stream_key, | |
319 | enum lttng_consumer_stream_state state) | |
320 | { | |
321 | struct lttng_consumer_stream *stream; | |
322 | ||
323 | pthread_mutex_lock(&consumer_data.lock); | |
324 | stream = consumer_find_stream(stream_key); | |
325 | if (stream) { | |
326 | stream->state = state; | |
327 | } | |
328 | consumer_data.need_update = 1; | |
329 | pthread_mutex_unlock(&consumer_data.lock); | |
330 | } | |
331 | ||
332 | /* | |
333 | * Remove a channel from the global list protected by a mutex. This | |
334 | * function is also responsible for freeing its data structures. | |
335 | */ | |
336 | void consumer_del_channel(struct lttng_consumer_channel *channel) | |
337 | { | |
338 | int ret; | |
e4421fec | 339 | struct lttng_ht_iter iter; |
3bd1e081 MD |
340 | |
341 | pthread_mutex_lock(&consumer_data.lock); | |
342 | ||
343 | switch (consumer_data.type) { | |
344 | case LTTNG_CONSUMER_KERNEL: | |
345 | break; | |
7753dea8 MD |
346 | case LTTNG_CONSUMER32_UST: |
347 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
348 | lttng_ustconsumer_del_channel(channel); |
349 | break; | |
350 | default: | |
351 | ERR("Unknown consumer_data type"); | |
352 | assert(0); | |
353 | goto end; | |
354 | } | |
355 | ||
6065ceec DG |
356 | rcu_read_lock(); |
357 | ||
e4421fec DG |
358 | lttng_ht_lookup(consumer_data.channel_ht, |
359 | (void *)((unsigned long) channel->key), &iter); | |
360 | ret = lttng_ht_del(consumer_data.channel_ht, &iter); | |
361 | assert(!ret); | |
362 | ||
6065ceec DG |
363 | rcu_read_unlock(); |
364 | ||
3bd1e081 MD |
365 | if (channel->mmap_base != NULL) { |
366 | ret = munmap(channel->mmap_base, channel->mmap_len); | |
367 | if (ret != 0) { | |
368 | perror("munmap"); | |
369 | } | |
370 | } | |
b5c5fc29 | 371 | if (channel->wait_fd >= 0 && !channel->wait_fd_is_copy) { |
4c462e79 MD |
372 | ret = close(channel->wait_fd); |
373 | if (ret) { | |
374 | PERROR("close"); | |
375 | } | |
3bd1e081 | 376 | } |
2c1dd183 | 377 | if (channel->shm_fd >= 0 && channel->wait_fd != channel->shm_fd) { |
4c462e79 MD |
378 | ret = close(channel->shm_fd); |
379 | if (ret) { | |
380 | PERROR("close"); | |
381 | } | |
3bd1e081 MD |
382 | } |
383 | free(channel); | |
384 | end: | |
385 | pthread_mutex_unlock(&consumer_data.lock); | |
386 | } | |
387 | ||
6065ceec DG |
388 | static void consumer_del_channel_rcu(struct rcu_head *head) |
389 | { | |
390 | struct lttng_ht_node_ulong *node = | |
391 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
392 | struct lttng_consumer_channel *channel= | |
393 | caa_container_of(node, struct lttng_consumer_channel, node); | |
394 | ||
395 | consumer_del_channel(channel); | |
396 | } | |
397 | ||
3bd1e081 MD |
398 | struct lttng_consumer_channel *consumer_allocate_channel( |
399 | int channel_key, | |
400 | int shm_fd, int wait_fd, | |
401 | uint64_t mmap_len, | |
402 | uint64_t max_sb_size) | |
403 | { | |
404 | struct lttng_consumer_channel *channel; | |
405 | int ret; | |
406 | ||
276b26d1 | 407 | channel = zmalloc(sizeof(*channel)); |
3bd1e081 MD |
408 | if (channel == NULL) { |
409 | perror("malloc struct lttng_consumer_channel"); | |
410 | goto end; | |
411 | } | |
412 | channel->key = channel_key; | |
413 | channel->shm_fd = shm_fd; | |
414 | channel->wait_fd = wait_fd; | |
415 | channel->mmap_len = mmap_len; | |
416 | channel->max_sb_size = max_sb_size; | |
417 | channel->refcount = 0; | |
418 | channel->nr_streams = 0; | |
e4421fec | 419 | lttng_ht_node_init_ulong(&channel->node, channel->key); |
3bd1e081 MD |
420 | |
421 | switch (consumer_data.type) { | |
422 | case LTTNG_CONSUMER_KERNEL: | |
423 | channel->mmap_base = NULL; | |
424 | channel->mmap_len = 0; | |
425 | break; | |
7753dea8 MD |
426 | case LTTNG_CONSUMER32_UST: |
427 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
428 | ret = lttng_ustconsumer_allocate_channel(channel); |
429 | if (ret) { | |
430 | free(channel); | |
431 | return NULL; | |
432 | } | |
433 | break; | |
434 | default: | |
435 | ERR("Unknown consumer_data type"); | |
436 | assert(0); | |
437 | goto end; | |
438 | } | |
439 | DBG("Allocated channel (key %d, shm_fd %d, wait_fd %d, mmap_len %llu, max_sb_size %llu)", | |
440 | channel->key, | |
441 | channel->shm_fd, | |
442 | channel->wait_fd, | |
443 | (unsigned long long) channel->mmap_len, | |
444 | (unsigned long long) channel->max_sb_size); | |
445 | end: | |
446 | return channel; | |
447 | } | |
448 | ||
449 | /* | |
450 | * Add a channel to the global list protected by a mutex. | |
451 | */ | |
452 | int consumer_add_channel(struct lttng_consumer_channel *channel) | |
453 | { | |
3bd1e081 | 454 | pthread_mutex_lock(&consumer_data.lock); |
7ad0a0cb MD |
455 | /* Steal channel identifier, for UST */ |
456 | consumer_steal_channel_key(channel->key); | |
6065ceec | 457 | rcu_read_lock(); |
e4421fec | 458 | lttng_ht_add_unique_ulong(consumer_data.channel_ht, &channel->node); |
6065ceec | 459 | rcu_read_unlock(); |
3bd1e081 | 460 | pthread_mutex_unlock(&consumer_data.lock); |
7ad0a0cb | 461 | return 0; |
3bd1e081 MD |
462 | } |
463 | ||
464 | /* | |
465 | * Allocate the pollfd structure and the local view of the out fds to avoid | |
466 | * doing a lookup in the linked list and concurrency issues when writing is | |
467 | * needed. Called with consumer_data.lock held. | |
468 | * | |
469 | * Returns the number of fds in the structures. | |
470 | */ | |
471 | int consumer_update_poll_array( | |
472 | struct lttng_consumer_local_data *ctx, struct pollfd **pollfd, | |
473 | struct lttng_consumer_stream **local_stream) | |
474 | { | |
3bd1e081 | 475 | int i = 0; |
e4421fec DG |
476 | struct lttng_ht_iter iter; |
477 | struct lttng_consumer_stream *stream; | |
3bd1e081 MD |
478 | |
479 | DBG("Updating poll fd array"); | |
e4421fec DG |
480 | cds_lfht_for_each_entry(consumer_data.stream_ht->ht, &iter.iter, stream, |
481 | node.node) { | |
482 | if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM) { | |
3bd1e081 MD |
483 | continue; |
484 | } | |
e4421fec DG |
485 | DBG("Active FD %d", stream->wait_fd); |
486 | (*pollfd)[i].fd = stream->wait_fd; | |
3bd1e081 | 487 | (*pollfd)[i].events = POLLIN | POLLPRI; |
e4421fec | 488 | local_stream[i] = stream; |
3bd1e081 MD |
489 | i++; |
490 | } | |
491 | ||
492 | /* | |
493 | * Insert the consumer_poll_pipe at the end of the array and don't | |
494 | * increment i so nb_fd is the number of real FD. | |
495 | */ | |
496 | (*pollfd)[i].fd = ctx->consumer_poll_pipe[0]; | |
497 | (*pollfd)[i].events = POLLIN; | |
498 | return i; | |
499 | } | |
500 | ||
501 | /* | |
502 | * Poll on the should_quit pipe and the command socket return -1 on error and | |
503 | * should exit, 0 if data is available on the command socket | |
504 | */ | |
505 | int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll) | |
506 | { | |
507 | int num_rdy; | |
508 | ||
88f2b785 | 509 | restart: |
3bd1e081 MD |
510 | num_rdy = poll(consumer_sockpoll, 2, -1); |
511 | if (num_rdy == -1) { | |
88f2b785 MD |
512 | /* |
513 | * Restart interrupted system call. | |
514 | */ | |
515 | if (errno == EINTR) { | |
516 | goto restart; | |
517 | } | |
3bd1e081 MD |
518 | perror("Poll error"); |
519 | goto exit; | |
520 | } | |
521 | if (consumer_sockpoll[0].revents == POLLIN) { | |
522 | DBG("consumer_should_quit wake up"); | |
523 | goto exit; | |
524 | } | |
525 | return 0; | |
526 | ||
527 | exit: | |
528 | return -1; | |
529 | } | |
530 | ||
531 | /* | |
532 | * Set the error socket. | |
533 | */ | |
534 | void lttng_consumer_set_error_sock( | |
535 | struct lttng_consumer_local_data *ctx, int sock) | |
536 | { | |
537 | ctx->consumer_error_socket = sock; | |
538 | } | |
539 | ||
540 | /* | |
541 | * Set the command socket path. | |
542 | */ | |
543 | ||
544 | void lttng_consumer_set_command_sock_path( | |
545 | struct lttng_consumer_local_data *ctx, char *sock) | |
546 | { | |
547 | ctx->consumer_command_sock_path = sock; | |
548 | } | |
549 | ||
550 | /* | |
551 | * Send return code to the session daemon. | |
552 | * If the socket is not defined, we return 0, it is not a fatal error | |
553 | */ | |
554 | int lttng_consumer_send_error( | |
555 | struct lttng_consumer_local_data *ctx, int cmd) | |
556 | { | |
557 | if (ctx->consumer_error_socket > 0) { | |
558 | return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd, | |
559 | sizeof(enum lttcomm_sessiond_command)); | |
560 | } | |
561 | ||
562 | return 0; | |
563 | } | |
564 | ||
565 | /* | |
566 | * Close all the tracefiles and stream fds, should be called when all instances | |
567 | * are destroyed. | |
568 | */ | |
569 | void lttng_consumer_cleanup(void) | |
570 | { | |
e4421fec DG |
571 | int ret; |
572 | struct lttng_ht_iter iter; | |
6065ceec DG |
573 | struct lttng_ht_node_ulong *node; |
574 | ||
575 | rcu_read_lock(); | |
3bd1e081 MD |
576 | |
577 | /* | |
6065ceec DG |
578 | * close all outfd. Called when there are no more threads running (after |
579 | * joining on the threads), no need to protect list iteration with mutex. | |
3bd1e081 | 580 | */ |
6065ceec DG |
581 | cds_lfht_for_each_entry(consumer_data.stream_ht->ht, &iter.iter, node, |
582 | node) { | |
e4421fec DG |
583 | ret = lttng_ht_del(consumer_data.stream_ht, &iter); |
584 | assert(!ret); | |
6065ceec | 585 | call_rcu(&node->head, consumer_del_stream_rcu); |
3bd1e081 | 586 | } |
e4421fec | 587 | |
6065ceec DG |
588 | cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, node, |
589 | node) { | |
e4421fec DG |
590 | ret = lttng_ht_del(consumer_data.channel_ht, &iter); |
591 | assert(!ret); | |
6065ceec | 592 | call_rcu(&node->head, consumer_del_channel_rcu); |
3bd1e081 | 593 | } |
6065ceec DG |
594 | |
595 | rcu_read_unlock(); | |
3bd1e081 MD |
596 | } |
597 | ||
598 | /* | |
599 | * Called from signal handler. | |
600 | */ | |
601 | void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx) | |
602 | { | |
603 | int ret; | |
604 | consumer_quit = 1; | |
605 | ret = write(ctx->consumer_should_quit[1], "4", 1); | |
606 | if (ret < 0) { | |
607 | perror("write consumer quit"); | |
608 | } | |
609 | } | |
610 | ||
611 | void lttng_consumer_sync_trace_file( | |
612 | struct lttng_consumer_stream *stream, off_t orig_offset) | |
613 | { | |
614 | int outfd = stream->out_fd; | |
615 | ||
616 | /* | |
617 | * This does a blocking write-and-wait on any page that belongs to the | |
618 | * subbuffer prior to the one we just wrote. | |
619 | * Don't care about error values, as these are just hints and ways to | |
620 | * limit the amount of page cache used. | |
621 | */ | |
622 | if (orig_offset < stream->chan->max_sb_size) { | |
623 | return; | |
624 | } | |
b9182dd9 | 625 | lttng_sync_file_range(outfd, orig_offset - stream->chan->max_sb_size, |
3bd1e081 MD |
626 | stream->chan->max_sb_size, |
627 | SYNC_FILE_RANGE_WAIT_BEFORE | |
628 | | SYNC_FILE_RANGE_WRITE | |
629 | | SYNC_FILE_RANGE_WAIT_AFTER); | |
630 | /* | |
631 | * Give hints to the kernel about how we access the file: | |
632 | * POSIX_FADV_DONTNEED : we won't re-access data in a near future after | |
633 | * we write it. | |
634 | * | |
635 | * We need to call fadvise again after the file grows because the | |
636 | * kernel does not seem to apply fadvise to non-existing parts of the | |
637 | * file. | |
638 | * | |
639 | * Call fadvise _after_ having waited for the page writeback to | |
640 | * complete because the dirty page writeback semantic is not well | |
641 | * defined. So it can be expected to lead to lower throughput in | |
642 | * streaming. | |
643 | */ | |
644 | posix_fadvise(outfd, orig_offset - stream->chan->max_sb_size, | |
645 | stream->chan->max_sb_size, POSIX_FADV_DONTNEED); | |
646 | } | |
647 | ||
648 | /* | |
649 | * Initialise the necessary environnement : | |
650 | * - create a new context | |
651 | * - create the poll_pipe | |
652 | * - create the should_quit pipe (for signal handler) | |
653 | * - create the thread pipe (for splice) | |
654 | * | |
655 | * Takes a function pointer as argument, this function is called when data is | |
656 | * available on a buffer. This function is responsible to do the | |
657 | * kernctl_get_next_subbuf, read the data with mmap or splice depending on the | |
658 | * buffer configuration and then kernctl_put_next_subbuf at the end. | |
659 | * | |
660 | * Returns a pointer to the new context or NULL on error. | |
661 | */ | |
662 | struct lttng_consumer_local_data *lttng_consumer_create( | |
663 | enum lttng_consumer_type type, | |
4078b776 | 664 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
d41f73b7 | 665 | struct lttng_consumer_local_data *ctx), |
3bd1e081 MD |
666 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
667 | int (*recv_stream)(struct lttng_consumer_stream *stream), | |
668 | int (*update_stream)(int stream_key, uint32_t state)) | |
669 | { | |
670 | int ret, i; | |
671 | struct lttng_consumer_local_data *ctx; | |
672 | ||
673 | assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN || | |
674 | consumer_data.type == type); | |
675 | consumer_data.type = type; | |
676 | ||
effcf122 | 677 | ctx = zmalloc(sizeof(struct lttng_consumer_local_data)); |
3bd1e081 MD |
678 | if (ctx == NULL) { |
679 | perror("allocating context"); | |
680 | goto error; | |
681 | } | |
682 | ||
683 | ctx->consumer_error_socket = -1; | |
684 | /* assign the callbacks */ | |
685 | ctx->on_buffer_ready = buffer_ready; | |
686 | ctx->on_recv_channel = recv_channel; | |
687 | ctx->on_recv_stream = recv_stream; | |
688 | ctx->on_update_stream = update_stream; | |
689 | ||
690 | ret = pipe(ctx->consumer_poll_pipe); | |
691 | if (ret < 0) { | |
692 | perror("Error creating poll pipe"); | |
693 | goto error_poll_pipe; | |
694 | } | |
695 | ||
696 | ret = pipe(ctx->consumer_should_quit); | |
697 | if (ret < 0) { | |
698 | perror("Error creating recv pipe"); | |
699 | goto error_quit_pipe; | |
700 | } | |
701 | ||
702 | ret = pipe(ctx->consumer_thread_pipe); | |
703 | if (ret < 0) { | |
704 | perror("Error creating thread pipe"); | |
705 | goto error_thread_pipe; | |
706 | } | |
707 | ||
708 | return ctx; | |
709 | ||
710 | ||
711 | error_thread_pipe: | |
712 | for (i = 0; i < 2; i++) { | |
713 | int err; | |
714 | ||
715 | err = close(ctx->consumer_should_quit[i]); | |
4c462e79 MD |
716 | if (err) { |
717 | PERROR("close"); | |
718 | } | |
3bd1e081 MD |
719 | } |
720 | error_quit_pipe: | |
721 | for (i = 0; i < 2; i++) { | |
722 | int err; | |
723 | ||
724 | err = close(ctx->consumer_poll_pipe[i]); | |
4c462e79 MD |
725 | if (err) { |
726 | PERROR("close"); | |
727 | } | |
3bd1e081 MD |
728 | } |
729 | error_poll_pipe: | |
730 | free(ctx); | |
731 | error: | |
732 | return NULL; | |
733 | } | |
734 | ||
735 | /* | |
736 | * Close all fds associated with the instance and free the context. | |
737 | */ | |
738 | void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx) | |
739 | { | |
4c462e79 MD |
740 | int ret; |
741 | ||
742 | ret = close(ctx->consumer_error_socket); | |
743 | if (ret) { | |
744 | PERROR("close"); | |
745 | } | |
746 | ret = close(ctx->consumer_thread_pipe[0]); | |
747 | if (ret) { | |
748 | PERROR("close"); | |
749 | } | |
750 | ret = close(ctx->consumer_thread_pipe[1]); | |
751 | if (ret) { | |
752 | PERROR("close"); | |
753 | } | |
754 | ret = close(ctx->consumer_poll_pipe[0]); | |
755 | if (ret) { | |
756 | PERROR("close"); | |
757 | } | |
758 | ret = close(ctx->consumer_poll_pipe[1]); | |
759 | if (ret) { | |
760 | PERROR("close"); | |
761 | } | |
762 | ret = close(ctx->consumer_should_quit[0]); | |
763 | if (ret) { | |
764 | PERROR("close"); | |
765 | } | |
766 | ret = close(ctx->consumer_should_quit[1]); | |
767 | if (ret) { | |
768 | PERROR("close"); | |
769 | } | |
3bd1e081 MD |
770 | unlink(ctx->consumer_command_sock_path); |
771 | free(ctx); | |
772 | } | |
773 | ||
774 | /* | |
775 | * Mmap the ring buffer, read it and write the data to the tracefile. | |
776 | * | |
777 | * Returns the number of bytes written | |
778 | */ | |
4078b776 | 779 | ssize_t lttng_consumer_on_read_subbuffer_mmap( |
3bd1e081 MD |
780 | struct lttng_consumer_local_data *ctx, |
781 | struct lttng_consumer_stream *stream, unsigned long len) | |
782 | { | |
783 | switch (consumer_data.type) { | |
784 | case LTTNG_CONSUMER_KERNEL: | |
785 | return lttng_kconsumer_on_read_subbuffer_mmap(ctx, stream, len); | |
7753dea8 MD |
786 | case LTTNG_CONSUMER32_UST: |
787 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
788 | return lttng_ustconsumer_on_read_subbuffer_mmap(ctx, stream, len); |
789 | default: | |
790 | ERR("Unknown consumer_data type"); | |
791 | assert(0); | |
792 | } | |
b9182dd9 DG |
793 | |
794 | return 0; | |
3bd1e081 MD |
795 | } |
796 | ||
797 | /* | |
798 | * Splice the data from the ring buffer to the tracefile. | |
799 | * | |
800 | * Returns the number of bytes spliced. | |
801 | */ | |
4078b776 | 802 | ssize_t lttng_consumer_on_read_subbuffer_splice( |
3bd1e081 MD |
803 | struct lttng_consumer_local_data *ctx, |
804 | struct lttng_consumer_stream *stream, unsigned long len) | |
805 | { | |
806 | switch (consumer_data.type) { | |
807 | case LTTNG_CONSUMER_KERNEL: | |
808 | return lttng_kconsumer_on_read_subbuffer_splice(ctx, stream, len); | |
7753dea8 MD |
809 | case LTTNG_CONSUMER32_UST: |
810 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
811 | return -ENOSYS; |
812 | default: | |
813 | ERR("Unknown consumer_data type"); | |
814 | assert(0); | |
815 | return -ENOSYS; | |
816 | } | |
817 | ||
818 | } | |
819 | ||
820 | /* | |
821 | * Take a snapshot for a specific fd | |
822 | * | |
823 | * Returns 0 on success, < 0 on error | |
824 | */ | |
825 | int lttng_consumer_take_snapshot(struct lttng_consumer_local_data *ctx, | |
826 | struct lttng_consumer_stream *stream) | |
827 | { | |
828 | switch (consumer_data.type) { | |
829 | case LTTNG_CONSUMER_KERNEL: | |
830 | return lttng_kconsumer_take_snapshot(ctx, stream); | |
7753dea8 MD |
831 | case LTTNG_CONSUMER32_UST: |
832 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
833 | return lttng_ustconsumer_take_snapshot(ctx, stream); |
834 | default: | |
835 | ERR("Unknown consumer_data type"); | |
836 | assert(0); | |
837 | return -ENOSYS; | |
838 | } | |
839 | ||
840 | } | |
841 | ||
842 | /* | |
843 | * Get the produced position | |
844 | * | |
845 | * Returns 0 on success, < 0 on error | |
846 | */ | |
847 | int lttng_consumer_get_produced_snapshot( | |
848 | struct lttng_consumer_local_data *ctx, | |
849 | struct lttng_consumer_stream *stream, | |
850 | unsigned long *pos) | |
851 | { | |
852 | switch (consumer_data.type) { | |
853 | case LTTNG_CONSUMER_KERNEL: | |
854 | return lttng_kconsumer_get_produced_snapshot(ctx, stream, pos); | |
7753dea8 MD |
855 | case LTTNG_CONSUMER32_UST: |
856 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
857 | return lttng_ustconsumer_get_produced_snapshot(ctx, stream, pos); |
858 | default: | |
859 | ERR("Unknown consumer_data type"); | |
860 | assert(0); | |
861 | return -ENOSYS; | |
862 | } | |
863 | } | |
864 | ||
865 | int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, | |
866 | int sock, struct pollfd *consumer_sockpoll) | |
867 | { | |
868 | switch (consumer_data.type) { | |
869 | case LTTNG_CONSUMER_KERNEL: | |
870 | return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
7753dea8 MD |
871 | case LTTNG_CONSUMER32_UST: |
872 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
873 | return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll); |
874 | default: | |
875 | ERR("Unknown consumer_data type"); | |
876 | assert(0); | |
877 | return -ENOSYS; | |
878 | } | |
879 | } | |
880 | ||
881 | /* | |
e4421fec | 882 | * This thread polls the fds in the set to consume the data and write |
3bd1e081 MD |
883 | * it to tracefile if necessary. |
884 | */ | |
885 | void *lttng_consumer_thread_poll_fds(void *data) | |
886 | { | |
887 | int num_rdy, num_hup, high_prio, ret, i; | |
888 | struct pollfd *pollfd = NULL; | |
889 | /* local view of the streams */ | |
890 | struct lttng_consumer_stream **local_stream = NULL; | |
891 | /* local view of consumer_data.fds_count */ | |
892 | int nb_fd = 0; | |
893 | char tmp; | |
894 | int tmp2; | |
895 | struct lttng_consumer_local_data *ctx = data; | |
896 | ||
e7b994a3 DG |
897 | rcu_register_thread(); |
898 | ||
effcf122 | 899 | local_stream = zmalloc(sizeof(struct lttng_consumer_stream)); |
3bd1e081 MD |
900 | |
901 | while (1) { | |
902 | high_prio = 0; | |
903 | num_hup = 0; | |
904 | ||
905 | /* | |
e4421fec | 906 | * the fds set has been updated, we need to update our |
3bd1e081 MD |
907 | * local array as well |
908 | */ | |
909 | pthread_mutex_lock(&consumer_data.lock); | |
910 | if (consumer_data.need_update) { | |
911 | if (pollfd != NULL) { | |
912 | free(pollfd); | |
913 | pollfd = NULL; | |
914 | } | |
915 | if (local_stream != NULL) { | |
916 | free(local_stream); | |
917 | local_stream = NULL; | |
918 | } | |
919 | ||
920 | /* allocate for all fds + 1 for the consumer_poll_pipe */ | |
effcf122 | 921 | pollfd = zmalloc((consumer_data.stream_count + 1) * sizeof(struct pollfd)); |
3bd1e081 MD |
922 | if (pollfd == NULL) { |
923 | perror("pollfd malloc"); | |
924 | pthread_mutex_unlock(&consumer_data.lock); | |
925 | goto end; | |
926 | } | |
927 | ||
928 | /* allocate for all fds + 1 for the consumer_poll_pipe */ | |
effcf122 | 929 | local_stream = zmalloc((consumer_data.stream_count + 1) * |
3bd1e081 MD |
930 | sizeof(struct lttng_consumer_stream)); |
931 | if (local_stream == NULL) { | |
932 | perror("local_stream malloc"); | |
933 | pthread_mutex_unlock(&consumer_data.lock); | |
934 | goto end; | |
935 | } | |
936 | ret = consumer_update_poll_array(ctx, &pollfd, local_stream); | |
937 | if (ret < 0) { | |
938 | ERR("Error in allocating pollfd or local_outfds"); | |
939 | lttng_consumer_send_error(ctx, CONSUMERD_POLL_ERROR); | |
940 | pthread_mutex_unlock(&consumer_data.lock); | |
941 | goto end; | |
942 | } | |
943 | nb_fd = ret; | |
944 | consumer_data.need_update = 0; | |
945 | } | |
946 | pthread_mutex_unlock(&consumer_data.lock); | |
947 | ||
4078b776 MD |
948 | /* No FDs and consumer_quit, consumer_cleanup the thread */ |
949 | if (nb_fd == 0 && consumer_quit == 1) { | |
950 | goto end; | |
951 | } | |
3bd1e081 | 952 | /* poll on the array of fds */ |
88f2b785 | 953 | restart: |
3bd1e081 MD |
954 | DBG("polling on %d fd", nb_fd + 1); |
955 | num_rdy = poll(pollfd, nb_fd + 1, consumer_poll_timeout); | |
956 | DBG("poll num_rdy : %d", num_rdy); | |
957 | if (num_rdy == -1) { | |
88f2b785 MD |
958 | /* |
959 | * Restart interrupted system call. | |
960 | */ | |
961 | if (errno == EINTR) { | |
962 | goto restart; | |
963 | } | |
3bd1e081 MD |
964 | perror("Poll error"); |
965 | lttng_consumer_send_error(ctx, CONSUMERD_POLL_ERROR); | |
966 | goto end; | |
967 | } else if (num_rdy == 0) { | |
968 | DBG("Polling thread timed out"); | |
969 | goto end; | |
970 | } | |
971 | ||
3bd1e081 MD |
972 | /* |
973 | * If the consumer_poll_pipe triggered poll go | |
974 | * directly to the beginning of the loop to update the | |
975 | * array. We want to prioritize array update over | |
976 | * low-priority reads. | |
977 | */ | |
d41f73b7 | 978 | if (pollfd[nb_fd].revents & POLLIN) { |
3bd1e081 MD |
979 | DBG("consumer_poll_pipe wake up"); |
980 | tmp2 = read(ctx->consumer_poll_pipe[0], &tmp, 1); | |
981 | if (tmp2 < 0) { | |
d41f73b7 | 982 | perror("read consumer poll"); |
3bd1e081 MD |
983 | } |
984 | continue; | |
985 | } | |
986 | ||
987 | /* Take care of high priority channels first. */ | |
988 | for (i = 0; i < nb_fd; i++) { | |
d41f73b7 | 989 | if (pollfd[i].revents & POLLPRI) { |
4078b776 MD |
990 | ssize_t len; |
991 | ||
d41f73b7 MD |
992 | DBG("Urgent read on fd %d", pollfd[i].fd); |
993 | high_prio = 1; | |
4078b776 | 994 | len = ctx->on_buffer_ready(local_stream[i], ctx); |
d41f73b7 | 995 | /* it's ok to have an unavailable sub-buffer */ |
4078b776 MD |
996 | if (len < 0 && len != -EAGAIN) { |
997 | goto end; | |
998 | } else if (len > 0) { | |
999 | local_stream[i]->data_read = 1; | |
d41f73b7 | 1000 | } |
3bd1e081 MD |
1001 | } |
1002 | } | |
1003 | ||
4078b776 MD |
1004 | /* |
1005 | * If we read high prio channel in this loop, try again | |
1006 | * for more high prio data. | |
1007 | */ | |
1008 | if (high_prio) { | |
3bd1e081 MD |
1009 | continue; |
1010 | } | |
1011 | ||
1012 | /* Take care of low priority channels. */ | |
4078b776 MD |
1013 | for (i = 0; i < nb_fd; i++) { |
1014 | if ((pollfd[i].revents & POLLIN) || | |
1015 | local_stream[i]->hangup_flush_done) { | |
1016 | ssize_t len; | |
1017 | ||
1018 | assert(!(pollfd[i].revents & POLLERR)); | |
1019 | assert(!(pollfd[i].revents & POLLNVAL)); | |
1020 | DBG("Normal read on fd %d", pollfd[i].fd); | |
1021 | len = ctx->on_buffer_ready(local_stream[i], ctx); | |
1022 | /* it's ok to have an unavailable sub-buffer */ | |
1023 | if (len < 0 && len != -EAGAIN) { | |
1024 | goto end; | |
1025 | } else if (len > 0) { | |
1026 | local_stream[i]->data_read = 1; | |
1027 | } | |
1028 | } | |
1029 | } | |
1030 | ||
1031 | /* Handle hangup and errors */ | |
1032 | for (i = 0; i < nb_fd; i++) { | |
1033 | if (!local_stream[i]->hangup_flush_done | |
1034 | && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL)) | |
1035 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
1036 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
1037 | DBG("fd %d is hup|err|nval. Attempting flush and read.", | |
1038 | pollfd[i].fd); | |
1039 | lttng_ustconsumer_on_stream_hangup(local_stream[i]); | |
1040 | /* Attempt read again, for the data we just flushed. */ | |
1041 | local_stream[i]->data_read = 1; | |
1042 | } | |
1043 | /* | |
1044 | * If the poll flag is HUP/ERR/NVAL and we have | |
1045 | * read no data in this pass, we can remove the | |
1046 | * stream from its hash table. | |
1047 | */ | |
1048 | if ((pollfd[i].revents & POLLHUP)) { | |
1049 | DBG("Polling fd %d tells it has hung up.", pollfd[i].fd); | |
1050 | if (!local_stream[i]->data_read) { | |
1051 | rcu_read_lock(); | |
1052 | consumer_del_stream_rcu(&local_stream[i]->node.head); | |
1053 | rcu_read_unlock(); | |
1054 | num_hup++; | |
1055 | } | |
1056 | } else if (pollfd[i].revents & POLLERR) { | |
1057 | ERR("Error returned in polling fd %d.", pollfd[i].fd); | |
1058 | if (!local_stream[i]->data_read) { | |
1059 | rcu_read_lock(); | |
1060 | consumer_del_stream_rcu(&local_stream[i]->node.head); | |
1061 | rcu_read_unlock(); | |
1062 | num_hup++; | |
1063 | } | |
1064 | } else if (pollfd[i].revents & POLLNVAL) { | |
1065 | ERR("Polling fd %d tells fd is not open.", pollfd[i].fd); | |
1066 | if (!local_stream[i]->data_read) { | |
1067 | rcu_read_lock(); | |
1068 | consumer_del_stream_rcu(&local_stream[i]->node.head); | |
1069 | rcu_read_unlock(); | |
1070 | num_hup++; | |
3bd1e081 MD |
1071 | } |
1072 | } | |
4078b776 | 1073 | local_stream[i]->data_read = 0; |
3bd1e081 MD |
1074 | } |
1075 | } | |
1076 | end: | |
1077 | DBG("polling thread exiting"); | |
1078 | if (pollfd != NULL) { | |
1079 | free(pollfd); | |
1080 | pollfd = NULL; | |
1081 | } | |
1082 | if (local_stream != NULL) { | |
1083 | free(local_stream); | |
1084 | local_stream = NULL; | |
1085 | } | |
e7b994a3 | 1086 | rcu_unregister_thread(); |
3bd1e081 MD |
1087 | return NULL; |
1088 | } | |
1089 | ||
1090 | /* | |
1091 | * This thread listens on the consumerd socket and receives the file | |
1092 | * descriptors from the session daemon. | |
1093 | */ | |
1094 | void *lttng_consumer_thread_receive_fds(void *data) | |
1095 | { | |
1096 | int sock, client_socket, ret; | |
1097 | /* | |
1098 | * structure to poll for incoming data on communication socket avoids | |
1099 | * making blocking sockets. | |
1100 | */ | |
1101 | struct pollfd consumer_sockpoll[2]; | |
1102 | struct lttng_consumer_local_data *ctx = data; | |
1103 | ||
e7b994a3 DG |
1104 | rcu_register_thread(); |
1105 | ||
3bd1e081 MD |
1106 | DBG("Creating command socket %s", ctx->consumer_command_sock_path); |
1107 | unlink(ctx->consumer_command_sock_path); | |
1108 | client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path); | |
1109 | if (client_socket < 0) { | |
1110 | ERR("Cannot create command socket"); | |
1111 | goto end; | |
1112 | } | |
1113 | ||
1114 | ret = lttcomm_listen_unix_sock(client_socket); | |
1115 | if (ret < 0) { | |
1116 | goto end; | |
1117 | } | |
1118 | ||
32258573 | 1119 | DBG("Sending ready command to lttng-sessiond"); |
3bd1e081 MD |
1120 | ret = lttng_consumer_send_error(ctx, CONSUMERD_COMMAND_SOCK_READY); |
1121 | /* return < 0 on error, but == 0 is not fatal */ | |
1122 | if (ret < 0) { | |
32258573 | 1123 | ERR("Error sending ready command to lttng-sessiond"); |
3bd1e081 MD |
1124 | goto end; |
1125 | } | |
1126 | ||
1127 | ret = fcntl(client_socket, F_SETFL, O_NONBLOCK); | |
1128 | if (ret < 0) { | |
1129 | perror("fcntl O_NONBLOCK"); | |
1130 | goto end; | |
1131 | } | |
1132 | ||
1133 | /* prepare the FDs to poll : to client socket and the should_quit pipe */ | |
1134 | consumer_sockpoll[0].fd = ctx->consumer_should_quit[0]; | |
1135 | consumer_sockpoll[0].events = POLLIN | POLLPRI; | |
1136 | consumer_sockpoll[1].fd = client_socket; | |
1137 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
1138 | ||
1139 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
1140 | goto end; | |
1141 | } | |
1142 | DBG("Connection on client_socket"); | |
1143 | ||
1144 | /* Blocking call, waiting for transmission */ | |
1145 | sock = lttcomm_accept_unix_sock(client_socket); | |
1146 | if (sock <= 0) { | |
1147 | WARN("On accept"); | |
1148 | goto end; | |
1149 | } | |
1150 | ret = fcntl(sock, F_SETFL, O_NONBLOCK); | |
1151 | if (ret < 0) { | |
1152 | perror("fcntl O_NONBLOCK"); | |
1153 | goto end; | |
1154 | } | |
1155 | ||
1156 | /* update the polling structure to poll on the established socket */ | |
1157 | consumer_sockpoll[1].fd = sock; | |
1158 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
1159 | ||
1160 | while (1) { | |
1161 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
1162 | goto end; | |
1163 | } | |
1164 | DBG("Incoming command on sock"); | |
1165 | ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
1166 | if (ret == -ENOENT) { | |
1167 | DBG("Received STOP command"); | |
1168 | goto end; | |
1169 | } | |
1170 | if (ret < 0) { | |
1171 | ERR("Communication interrupted on command socket"); | |
1172 | goto end; | |
1173 | } | |
1174 | if (consumer_quit) { | |
1175 | DBG("consumer_thread_receive_fds received quit from signal"); | |
1176 | goto end; | |
1177 | } | |
1178 | DBG("received fds on sock"); | |
1179 | } | |
1180 | end: | |
1181 | DBG("consumer_thread_receive_fds exiting"); | |
1182 | ||
1183 | /* | |
1184 | * when all fds have hung up, the polling thread | |
1185 | * can exit cleanly | |
1186 | */ | |
1187 | consumer_quit = 1; | |
1188 | ||
1189 | /* | |
1190 | * 2s of grace period, if no polling events occur during | |
1191 | * this period, the polling thread will exit even if there | |
1192 | * are still open FDs (should not happen, but safety mechanism). | |
1193 | */ | |
1194 | consumer_poll_timeout = LTTNG_CONSUMER_POLL_TIMEOUT; | |
1195 | ||
1196 | /* wake up the polling thread */ | |
1197 | ret = write(ctx->consumer_poll_pipe[1], "4", 1); | |
1198 | if (ret < 0) { | |
1199 | perror("poll pipe write"); | |
1200 | } | |
e7b994a3 | 1201 | rcu_unregister_thread(); |
3bd1e081 MD |
1202 | return NULL; |
1203 | } | |
d41f73b7 | 1204 | |
4078b776 | 1205 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
1206 | struct lttng_consumer_local_data *ctx) |
1207 | { | |
1208 | switch (consumer_data.type) { | |
1209 | case LTTNG_CONSUMER_KERNEL: | |
1210 | return lttng_kconsumer_read_subbuffer(stream, ctx); | |
7753dea8 MD |
1211 | case LTTNG_CONSUMER32_UST: |
1212 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
1213 | return lttng_ustconsumer_read_subbuffer(stream, ctx); |
1214 | default: | |
1215 | ERR("Unknown consumer_data type"); | |
1216 | assert(0); | |
1217 | return -ENOSYS; | |
1218 | } | |
1219 | } | |
1220 | ||
1221 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
1222 | { | |
1223 | switch (consumer_data.type) { | |
1224 | case LTTNG_CONSUMER_KERNEL: | |
1225 | return lttng_kconsumer_on_recv_stream(stream); | |
7753dea8 MD |
1226 | case LTTNG_CONSUMER32_UST: |
1227 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
1228 | return lttng_ustconsumer_on_recv_stream(stream); |
1229 | default: | |
1230 | ERR("Unknown consumer_data type"); | |
1231 | assert(0); | |
1232 | return -ENOSYS; | |
1233 | } | |
1234 | } | |
e4421fec DG |
1235 | |
1236 | /* | |
1237 | * Allocate and set consumer data hash tables. | |
1238 | */ | |
1239 | void lttng_consumer_init(void) | |
1240 | { | |
1241 | consumer_data.stream_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
1242 | consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
1243 | } | |
1244 |