Commit | Line | Data |
---|---|---|
3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
00e2e675 | 4 | * 2012 - David Goulet <dgoulet@efficios.com> |
3bd1e081 | 5 | * |
d14d33bf AM |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License, version 2 only, | |
8 | * as published by the Free Software Foundation. | |
3bd1e081 | 9 | * |
d14d33bf AM |
10 | * This program is distributed in the hope that it will be useful, but WITHOUT |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
3bd1e081 | 14 | * |
d14d33bf AM |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
3bd1e081 MD |
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> | |
77c7c900 | 30 | #include <inttypes.h> |
3bd1e081 | 31 | |
990570ed | 32 | #include <common/common.h> |
fb3a43a9 DG |
33 | #include <common/utils.h> |
34 | #include <common/compat/poll.h> | |
10a8a223 | 35 | #include <common/kernel-ctl/kernel-ctl.h> |
00e2e675 | 36 | #include <common/sessiond-comm/relayd.h> |
10a8a223 DG |
37 | #include <common/sessiond-comm/sessiond-comm.h> |
38 | #include <common/kernel-consumer/kernel-consumer.h> | |
00e2e675 | 39 | #include <common/relayd/relayd.h> |
10a8a223 DG |
40 | #include <common/ust-consumer/ust-consumer.h> |
41 | ||
42 | #include "consumer.h" | |
3bd1e081 MD |
43 | |
44 | struct lttng_consumer_global_data consumer_data = { | |
3bd1e081 MD |
45 | .stream_count = 0, |
46 | .need_update = 1, | |
47 | .type = LTTNG_CONSUMER_UNKNOWN, | |
48 | }; | |
49 | ||
50 | /* timeout parameter, to control the polling thread grace period. */ | |
51 | int consumer_poll_timeout = -1; | |
52 | ||
53 | /* | |
54 | * Flag to inform the polling thread to quit when all fd hung up. Updated by | |
55 | * the consumer_thread_receive_fds when it notices that all fds has hung up. | |
56 | * Also updated by the signal handler (consumer_should_exit()). Read by the | |
57 | * polling threads. | |
58 | */ | |
59 | volatile int consumer_quit = 0; | |
60 | ||
61 | /* | |
62 | * Find a stream. The consumer_data.lock must be locked during this | |
63 | * call. | |
64 | */ | |
65 | static struct lttng_consumer_stream *consumer_find_stream(int key) | |
66 | { | |
e4421fec DG |
67 | struct lttng_ht_iter iter; |
68 | struct lttng_ht_node_ulong *node; | |
69 | struct lttng_consumer_stream *stream = NULL; | |
3bd1e081 | 70 | |
7ad0a0cb MD |
71 | /* Negative keys are lookup failures */ |
72 | if (key < 0) | |
73 | return NULL; | |
e4421fec | 74 | |
6065ceec DG |
75 | rcu_read_lock(); |
76 | ||
e4421fec DG |
77 | lttng_ht_lookup(consumer_data.stream_ht, (void *)((unsigned long) key), |
78 | &iter); | |
79 | node = lttng_ht_iter_get_node_ulong(&iter); | |
80 | if (node != NULL) { | |
81 | stream = caa_container_of(node, struct lttng_consumer_stream, node); | |
3bd1e081 | 82 | } |
e4421fec | 83 | |
6065ceec DG |
84 | rcu_read_unlock(); |
85 | ||
e4421fec | 86 | return stream; |
3bd1e081 MD |
87 | } |
88 | ||
7ad0a0cb MD |
89 | static void consumer_steal_stream_key(int key) |
90 | { | |
91 | struct lttng_consumer_stream *stream; | |
92 | ||
04253271 | 93 | rcu_read_lock(); |
7ad0a0cb | 94 | stream = consumer_find_stream(key); |
04253271 | 95 | if (stream) { |
7ad0a0cb | 96 | stream->key = -1; |
04253271 MD |
97 | /* |
98 | * We don't want the lookup to match, but we still need | |
99 | * to iterate on this stream when iterating over the hash table. Just | |
100 | * change the node key. | |
101 | */ | |
102 | stream->node.key = -1; | |
103 | } | |
104 | rcu_read_unlock(); | |
7ad0a0cb MD |
105 | } |
106 | ||
3bd1e081 MD |
107 | static struct lttng_consumer_channel *consumer_find_channel(int key) |
108 | { | |
e4421fec DG |
109 | struct lttng_ht_iter iter; |
110 | struct lttng_ht_node_ulong *node; | |
111 | struct lttng_consumer_channel *channel = NULL; | |
3bd1e081 | 112 | |
7ad0a0cb MD |
113 | /* Negative keys are lookup failures */ |
114 | if (key < 0) | |
115 | return NULL; | |
e4421fec | 116 | |
6065ceec DG |
117 | rcu_read_lock(); |
118 | ||
e4421fec DG |
119 | lttng_ht_lookup(consumer_data.channel_ht, (void *)((unsigned long) key), |
120 | &iter); | |
121 | node = lttng_ht_iter_get_node_ulong(&iter); | |
122 | if (node != NULL) { | |
123 | channel = caa_container_of(node, struct lttng_consumer_channel, node); | |
3bd1e081 | 124 | } |
e4421fec | 125 | |
6065ceec DG |
126 | rcu_read_unlock(); |
127 | ||
e4421fec | 128 | return channel; |
3bd1e081 MD |
129 | } |
130 | ||
7ad0a0cb MD |
131 | static void consumer_steal_channel_key(int key) |
132 | { | |
133 | struct lttng_consumer_channel *channel; | |
134 | ||
04253271 | 135 | rcu_read_lock(); |
7ad0a0cb | 136 | channel = consumer_find_channel(key); |
04253271 | 137 | if (channel) { |
7ad0a0cb | 138 | channel->key = -1; |
04253271 MD |
139 | /* |
140 | * We don't want the lookup to match, but we still need | |
141 | * to iterate on this channel when iterating over the hash table. Just | |
142 | * change the node key. | |
143 | */ | |
144 | channel->node.key = -1; | |
145 | } | |
146 | rcu_read_unlock(); | |
7ad0a0cb MD |
147 | } |
148 | ||
702b1ea4 MD |
149 | static |
150 | void consumer_free_stream(struct rcu_head *head) | |
151 | { | |
152 | struct lttng_ht_node_ulong *node = | |
153 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
154 | struct lttng_consumer_stream *stream = | |
155 | caa_container_of(node, struct lttng_consumer_stream, node); | |
156 | ||
157 | free(stream); | |
158 | } | |
159 | ||
00e2e675 DG |
160 | /* |
161 | * RCU protected relayd socket pair free. | |
162 | */ | |
163 | static void consumer_rcu_free_relayd(struct rcu_head *head) | |
164 | { | |
165 | struct lttng_ht_node_ulong *node = | |
166 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
167 | struct consumer_relayd_sock_pair *relayd = | |
168 | caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
169 | ||
170 | free(relayd); | |
171 | } | |
172 | ||
173 | /* | |
174 | * Destroy and free relayd socket pair object. | |
175 | * | |
176 | * This function MUST be called with the consumer_data lock acquired. | |
177 | */ | |
178 | void consumer_destroy_relayd(struct consumer_relayd_sock_pair *relayd) | |
179 | { | |
180 | int ret; | |
181 | struct lttng_ht_iter iter; | |
182 | ||
173af62f DG |
183 | if (relayd == NULL) { |
184 | return; | |
185 | } | |
186 | ||
00e2e675 DG |
187 | DBG("Consumer destroy and close relayd socket pair"); |
188 | ||
189 | iter.iter.node = &relayd->node.node; | |
190 | ret = lttng_ht_del(consumer_data.relayd_ht, &iter); | |
173af62f DG |
191 | if (ret != 0) { |
192 | /* We assume the relayd was already destroyed */ | |
193 | return; | |
194 | } | |
00e2e675 DG |
195 | |
196 | /* Close all sockets */ | |
197 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
198 | (void) relayd_close(&relayd->control_sock); | |
199 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
200 | (void) relayd_close(&relayd->data_sock); | |
201 | ||
202 | /* RCU free() call */ | |
203 | call_rcu(&relayd->node.head, consumer_rcu_free_relayd); | |
204 | } | |
205 | ||
a6ba4fe1 DG |
206 | /* |
207 | * Flag a relayd socket pair for destruction. Destroy it if the refcount | |
208 | * reaches zero. | |
209 | * | |
210 | * RCU read side lock MUST be aquired before calling this function. | |
211 | */ | |
212 | void consumer_flag_relayd_for_destroy(struct consumer_relayd_sock_pair *relayd) | |
213 | { | |
214 | assert(relayd); | |
215 | ||
216 | /* Set destroy flag for this object */ | |
217 | uatomic_set(&relayd->destroy_flag, 1); | |
218 | ||
219 | /* Destroy the relayd if refcount is 0 */ | |
220 | if (uatomic_read(&relayd->refcount) == 0) { | |
221 | consumer_destroy_relayd(relayd); | |
222 | } | |
223 | } | |
224 | ||
3bd1e081 MD |
225 | /* |
226 | * Remove a stream from the global list protected by a mutex. This | |
227 | * function is also responsible for freeing its data structures. | |
228 | */ | |
229 | void consumer_del_stream(struct lttng_consumer_stream *stream) | |
230 | { | |
231 | int ret; | |
e4421fec | 232 | struct lttng_ht_iter iter; |
3bd1e081 | 233 | struct lttng_consumer_channel *free_chan = NULL; |
00e2e675 DG |
234 | struct consumer_relayd_sock_pair *relayd; |
235 | ||
236 | assert(stream); | |
3bd1e081 MD |
237 | |
238 | pthread_mutex_lock(&consumer_data.lock); | |
239 | ||
240 | switch (consumer_data.type) { | |
241 | case LTTNG_CONSUMER_KERNEL: | |
242 | if (stream->mmap_base != NULL) { | |
243 | ret = munmap(stream->mmap_base, stream->mmap_len); | |
244 | if (ret != 0) { | |
245 | perror("munmap"); | |
246 | } | |
247 | } | |
248 | break; | |
7753dea8 MD |
249 | case LTTNG_CONSUMER32_UST: |
250 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
251 | lttng_ustconsumer_del_stream(stream); |
252 | break; | |
253 | default: | |
254 | ERR("Unknown consumer_data type"); | |
255 | assert(0); | |
256 | goto end; | |
257 | } | |
258 | ||
6065ceec | 259 | rcu_read_lock(); |
04253271 MD |
260 | iter.iter.node = &stream->node.node; |
261 | ret = lttng_ht_del(consumer_data.stream_ht, &iter); | |
262 | assert(!ret); | |
e4421fec | 263 | |
6065ceec DG |
264 | rcu_read_unlock(); |
265 | ||
3bd1e081 MD |
266 | if (consumer_data.stream_count <= 0) { |
267 | goto end; | |
268 | } | |
269 | consumer_data.stream_count--; | |
270 | if (!stream) { | |
271 | goto end; | |
272 | } | |
273 | if (stream->out_fd >= 0) { | |
4c462e79 MD |
274 | ret = close(stream->out_fd); |
275 | if (ret) { | |
276 | PERROR("close"); | |
277 | } | |
3bd1e081 | 278 | } |
b5c5fc29 | 279 | if (stream->wait_fd >= 0 && !stream->wait_fd_is_copy) { |
4c462e79 MD |
280 | ret = close(stream->wait_fd); |
281 | if (ret) { | |
282 | PERROR("close"); | |
283 | } | |
3bd1e081 | 284 | } |
2c1dd183 | 285 | if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) { |
4c462e79 MD |
286 | ret = close(stream->shm_fd); |
287 | if (ret) { | |
288 | PERROR("close"); | |
289 | } | |
3bd1e081 | 290 | } |
00e2e675 DG |
291 | |
292 | /* Check and cleanup relayd */ | |
b0b335c8 | 293 | rcu_read_lock(); |
00e2e675 DG |
294 | relayd = consumer_find_relayd(stream->net_seq_idx); |
295 | if (relayd != NULL) { | |
b0b335c8 MD |
296 | uatomic_dec(&relayd->refcount); |
297 | assert(uatomic_read(&relayd->refcount) >= 0); | |
173af62f | 298 | |
3f8e211f DG |
299 | /* Closing streams requires to lock the control socket. */ |
300 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
173af62f DG |
301 | ret = relayd_send_close_stream(&relayd->control_sock, |
302 | stream->relayd_stream_id, | |
303 | stream->next_net_seq_num - 1); | |
3f8e211f | 304 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); |
173af62f | 305 | if (ret < 0) { |
a4b92340 DG |
306 | DBG("Unable to close stream on the relayd. Continuing"); |
307 | /* | |
308 | * Continue here. There is nothing we can do for the relayd. | |
309 | * Chances are that the relayd has closed the socket so we just | |
310 | * continue cleaning up. | |
311 | */ | |
173af62f DG |
312 | } |
313 | ||
314 | /* Both conditions are met, we destroy the relayd. */ | |
315 | if (uatomic_read(&relayd->refcount) == 0 && | |
316 | uatomic_read(&relayd->destroy_flag)) { | |
00e2e675 DG |
317 | consumer_destroy_relayd(relayd); |
318 | } | |
00e2e675 | 319 | } |
b0b335c8 | 320 | rcu_read_unlock(); |
00e2e675 DG |
321 | |
322 | if (!--stream->chan->refcount) { | |
3bd1e081 | 323 | free_chan = stream->chan; |
00e2e675 DG |
324 | } |
325 | ||
702b1ea4 MD |
326 | |
327 | call_rcu(&stream->node.head, consumer_free_stream); | |
3bd1e081 MD |
328 | end: |
329 | consumer_data.need_update = 1; | |
330 | pthread_mutex_unlock(&consumer_data.lock); | |
331 | ||
332 | if (free_chan) | |
333 | consumer_del_channel(free_chan); | |
334 | } | |
335 | ||
336 | struct lttng_consumer_stream *consumer_allocate_stream( | |
337 | int channel_key, int stream_key, | |
338 | int shm_fd, int wait_fd, | |
339 | enum lttng_consumer_stream_state state, | |
340 | uint64_t mmap_len, | |
341 | enum lttng_event_output output, | |
6df2e2c9 MD |
342 | const char *path_name, |
343 | uid_t uid, | |
00e2e675 DG |
344 | gid_t gid, |
345 | int net_index, | |
346 | int metadata_flag) | |
3bd1e081 MD |
347 | { |
348 | struct lttng_consumer_stream *stream; | |
349 | int ret; | |
350 | ||
effcf122 | 351 | stream = zmalloc(sizeof(*stream)); |
3bd1e081 MD |
352 | if (stream == NULL) { |
353 | perror("malloc struct lttng_consumer_stream"); | |
354 | goto end; | |
355 | } | |
356 | stream->chan = consumer_find_channel(channel_key); | |
357 | if (!stream->chan) { | |
358 | perror("Unable to find channel key"); | |
359 | goto end; | |
360 | } | |
361 | stream->chan->refcount++; | |
362 | stream->key = stream_key; | |
363 | stream->shm_fd = shm_fd; | |
364 | stream->wait_fd = wait_fd; | |
365 | stream->out_fd = -1; | |
366 | stream->out_fd_offset = 0; | |
367 | stream->state = state; | |
368 | stream->mmap_len = mmap_len; | |
369 | stream->mmap_base = NULL; | |
370 | stream->output = output; | |
6df2e2c9 MD |
371 | stream->uid = uid; |
372 | stream->gid = gid; | |
00e2e675 DG |
373 | stream->net_seq_idx = net_index; |
374 | stream->metadata_flag = metadata_flag; | |
375 | strncpy(stream->path_name, path_name, sizeof(stream->path_name)); | |
376 | stream->path_name[sizeof(stream->path_name) - 1] = '\0'; | |
e4421fec | 377 | lttng_ht_node_init_ulong(&stream->node, stream->key); |
00e2e675 | 378 | lttng_ht_node_init_ulong(&stream->waitfd_node, stream->wait_fd); |
3bd1e081 MD |
379 | |
380 | switch (consumer_data.type) { | |
381 | case LTTNG_CONSUMER_KERNEL: | |
382 | break; | |
7753dea8 MD |
383 | case LTTNG_CONSUMER32_UST: |
384 | case LTTNG_CONSUMER64_UST: | |
5af2f756 | 385 | stream->cpu = stream->chan->cpucount++; |
3bd1e081 MD |
386 | ret = lttng_ustconsumer_allocate_stream(stream); |
387 | if (ret) { | |
388 | free(stream); | |
389 | return NULL; | |
390 | } | |
391 | break; | |
392 | default: | |
393 | ERR("Unknown consumer_data type"); | |
394 | assert(0); | |
395 | goto end; | |
396 | } | |
00e2e675 | 397 | DBG("Allocated stream %s (key %d, shm_fd %d, wait_fd %d, mmap_len %llu, out_fd %d, net_seq_idx %d)", |
3bd1e081 MD |
398 | stream->path_name, stream->key, |
399 | stream->shm_fd, | |
400 | stream->wait_fd, | |
401 | (unsigned long long) stream->mmap_len, | |
00e2e675 DG |
402 | stream->out_fd, |
403 | stream->net_seq_idx); | |
3bd1e081 MD |
404 | end: |
405 | return stream; | |
406 | } | |
407 | ||
408 | /* | |
409 | * Add a stream to the global list protected by a mutex. | |
410 | */ | |
411 | int consumer_add_stream(struct lttng_consumer_stream *stream) | |
412 | { | |
413 | int ret = 0; | |
c77fc10a DG |
414 | struct lttng_ht_node_ulong *node; |
415 | struct lttng_ht_iter iter; | |
00e2e675 | 416 | struct consumer_relayd_sock_pair *relayd; |
3bd1e081 MD |
417 | |
418 | pthread_mutex_lock(&consumer_data.lock); | |
7ad0a0cb MD |
419 | /* Steal stream identifier, for UST */ |
420 | consumer_steal_stream_key(stream->key); | |
c77fc10a | 421 | |
b0b335c8 | 422 | rcu_read_lock(); |
c77fc10a DG |
423 | lttng_ht_lookup(consumer_data.stream_ht, |
424 | (void *)((unsigned long) stream->key), &iter); | |
425 | node = lttng_ht_iter_get_node_ulong(&iter); | |
426 | if (node != NULL) { | |
427 | rcu_read_unlock(); | |
428 | /* Stream already exist. Ignore the insertion */ | |
429 | goto end; | |
430 | } | |
431 | ||
04253271 | 432 | lttng_ht_add_unique_ulong(consumer_data.stream_ht, &stream->node); |
00e2e675 DG |
433 | |
434 | /* Check and cleanup relayd */ | |
435 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
436 | if (relayd != NULL) { | |
b0b335c8 | 437 | uatomic_inc(&relayd->refcount); |
00e2e675 | 438 | } |
b0b335c8 | 439 | rcu_read_unlock(); |
00e2e675 DG |
440 | |
441 | /* Update consumer data */ | |
3bd1e081 MD |
442 | consumer_data.stream_count++; |
443 | consumer_data.need_update = 1; | |
444 | ||
3bd1e081 MD |
445 | end: |
446 | pthread_mutex_unlock(&consumer_data.lock); | |
702b1ea4 | 447 | |
3bd1e081 MD |
448 | return ret; |
449 | } | |
450 | ||
00e2e675 | 451 | /* |
3f8e211f DG |
452 | * Add relayd socket to global consumer data hashtable. RCU read side lock MUST |
453 | * be acquired before calling this. | |
00e2e675 | 454 | */ |
3f8e211f | 455 | |
00e2e675 DG |
456 | int consumer_add_relayd(struct consumer_relayd_sock_pair *relayd) |
457 | { | |
458 | int ret = 0; | |
459 | struct lttng_ht_node_ulong *node; | |
460 | struct lttng_ht_iter iter; | |
461 | ||
462 | if (relayd == NULL) { | |
463 | ret = -1; | |
464 | goto end; | |
465 | } | |
466 | ||
00e2e675 DG |
467 | lttng_ht_lookup(consumer_data.relayd_ht, |
468 | (void *)((unsigned long) relayd->net_seq_idx), &iter); | |
469 | node = lttng_ht_iter_get_node_ulong(&iter); | |
470 | if (node != NULL) { | |
00e2e675 DG |
471 | /* Relayd already exist. Ignore the insertion */ |
472 | goto end; | |
473 | } | |
474 | lttng_ht_add_unique_ulong(consumer_data.relayd_ht, &relayd->node); | |
475 | ||
00e2e675 DG |
476 | end: |
477 | return ret; | |
478 | } | |
479 | ||
480 | /* | |
481 | * Allocate and return a consumer relayd socket. | |
482 | */ | |
483 | struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair( | |
484 | int net_seq_idx) | |
485 | { | |
486 | struct consumer_relayd_sock_pair *obj = NULL; | |
487 | ||
488 | /* Negative net sequence index is a failure */ | |
489 | if (net_seq_idx < 0) { | |
490 | goto error; | |
491 | } | |
492 | ||
493 | obj = zmalloc(sizeof(struct consumer_relayd_sock_pair)); | |
494 | if (obj == NULL) { | |
495 | PERROR("zmalloc relayd sock"); | |
496 | goto error; | |
497 | } | |
498 | ||
499 | obj->net_seq_idx = net_seq_idx; | |
500 | obj->refcount = 0; | |
173af62f | 501 | obj->destroy_flag = 0; |
00e2e675 DG |
502 | lttng_ht_node_init_ulong(&obj->node, obj->net_seq_idx); |
503 | pthread_mutex_init(&obj->ctrl_sock_mutex, NULL); | |
504 | ||
505 | error: | |
506 | return obj; | |
507 | } | |
508 | ||
509 | /* | |
510 | * Find a relayd socket pair in the global consumer data. | |
511 | * | |
512 | * Return the object if found else NULL. | |
b0b335c8 MD |
513 | * RCU read-side lock must be held across this call and while using the |
514 | * returned object. | |
00e2e675 DG |
515 | */ |
516 | struct consumer_relayd_sock_pair *consumer_find_relayd(int key) | |
517 | { | |
518 | struct lttng_ht_iter iter; | |
519 | struct lttng_ht_node_ulong *node; | |
520 | struct consumer_relayd_sock_pair *relayd = NULL; | |
521 | ||
522 | /* Negative keys are lookup failures */ | |
523 | if (key < 0) { | |
524 | goto error; | |
525 | } | |
526 | ||
00e2e675 DG |
527 | lttng_ht_lookup(consumer_data.relayd_ht, (void *)((unsigned long) key), |
528 | &iter); | |
529 | node = lttng_ht_iter_get_node_ulong(&iter); | |
530 | if (node != NULL) { | |
531 | relayd = caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
532 | } | |
533 | ||
00e2e675 DG |
534 | error: |
535 | return relayd; | |
536 | } | |
537 | ||
538 | /* | |
539 | * Handle stream for relayd transmission if the stream applies for network | |
540 | * streaming where the net sequence index is set. | |
541 | * | |
542 | * Return destination file descriptor or negative value on error. | |
543 | */ | |
6197aea7 | 544 | static int write_relayd_stream_header(struct lttng_consumer_stream *stream, |
1d4dfdef DG |
545 | size_t data_size, unsigned long padding, |
546 | struct consumer_relayd_sock_pair *relayd) | |
00e2e675 DG |
547 | { |
548 | int outfd = -1, ret; | |
00e2e675 DG |
549 | struct lttcomm_relayd_data_hdr data_hdr; |
550 | ||
551 | /* Safety net */ | |
552 | assert(stream); | |
6197aea7 | 553 | assert(relayd); |
00e2e675 DG |
554 | |
555 | /* Reset data header */ | |
556 | memset(&data_hdr, 0, sizeof(data_hdr)); | |
557 | ||
00e2e675 DG |
558 | if (stream->metadata_flag) { |
559 | /* Caller MUST acquire the relayd control socket lock */ | |
560 | ret = relayd_send_metadata(&relayd->control_sock, data_size); | |
561 | if (ret < 0) { | |
562 | goto error; | |
563 | } | |
564 | ||
565 | /* Metadata are always sent on the control socket. */ | |
566 | outfd = relayd->control_sock.fd; | |
567 | } else { | |
568 | /* Set header with stream information */ | |
569 | data_hdr.stream_id = htobe64(stream->relayd_stream_id); | |
570 | data_hdr.data_size = htobe32(data_size); | |
1d4dfdef | 571 | data_hdr.padding_size = htobe32(padding); |
173af62f | 572 | data_hdr.net_seq_num = htobe64(stream->next_net_seq_num++); |
00e2e675 DG |
573 | /* Other fields are zeroed previously */ |
574 | ||
575 | ret = relayd_send_data_hdr(&relayd->data_sock, &data_hdr, | |
576 | sizeof(data_hdr)); | |
577 | if (ret < 0) { | |
578 | goto error; | |
579 | } | |
580 | ||
581 | /* Set to go on data socket */ | |
582 | outfd = relayd->data_sock.fd; | |
583 | } | |
584 | ||
585 | error: | |
586 | return outfd; | |
587 | } | |
588 | ||
3bd1e081 MD |
589 | /* |
590 | * Update a stream according to what we just received. | |
591 | */ | |
592 | void consumer_change_stream_state(int stream_key, | |
593 | enum lttng_consumer_stream_state state) | |
594 | { | |
595 | struct lttng_consumer_stream *stream; | |
596 | ||
597 | pthread_mutex_lock(&consumer_data.lock); | |
598 | stream = consumer_find_stream(stream_key); | |
599 | if (stream) { | |
600 | stream->state = state; | |
601 | } | |
602 | consumer_data.need_update = 1; | |
603 | pthread_mutex_unlock(&consumer_data.lock); | |
604 | } | |
605 | ||
702b1ea4 MD |
606 | static |
607 | void consumer_free_channel(struct rcu_head *head) | |
608 | { | |
609 | struct lttng_ht_node_ulong *node = | |
610 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
611 | struct lttng_consumer_channel *channel = | |
612 | caa_container_of(node, struct lttng_consumer_channel, node); | |
613 | ||
614 | free(channel); | |
615 | } | |
616 | ||
3bd1e081 MD |
617 | /* |
618 | * Remove a channel from the global list protected by a mutex. This | |
619 | * function is also responsible for freeing its data structures. | |
620 | */ | |
621 | void consumer_del_channel(struct lttng_consumer_channel *channel) | |
622 | { | |
623 | int ret; | |
e4421fec | 624 | struct lttng_ht_iter iter; |
3bd1e081 MD |
625 | |
626 | pthread_mutex_lock(&consumer_data.lock); | |
627 | ||
628 | switch (consumer_data.type) { | |
629 | case LTTNG_CONSUMER_KERNEL: | |
630 | break; | |
7753dea8 MD |
631 | case LTTNG_CONSUMER32_UST: |
632 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
633 | lttng_ustconsumer_del_channel(channel); |
634 | break; | |
635 | default: | |
636 | ERR("Unknown consumer_data type"); | |
637 | assert(0); | |
638 | goto end; | |
639 | } | |
640 | ||
6065ceec | 641 | rcu_read_lock(); |
04253271 MD |
642 | iter.iter.node = &channel->node.node; |
643 | ret = lttng_ht_del(consumer_data.channel_ht, &iter); | |
644 | assert(!ret); | |
6065ceec DG |
645 | rcu_read_unlock(); |
646 | ||
3bd1e081 MD |
647 | if (channel->mmap_base != NULL) { |
648 | ret = munmap(channel->mmap_base, channel->mmap_len); | |
649 | if (ret != 0) { | |
650 | perror("munmap"); | |
651 | } | |
652 | } | |
b5c5fc29 | 653 | if (channel->wait_fd >= 0 && !channel->wait_fd_is_copy) { |
4c462e79 MD |
654 | ret = close(channel->wait_fd); |
655 | if (ret) { | |
656 | PERROR("close"); | |
657 | } | |
3bd1e081 | 658 | } |
2c1dd183 | 659 | if (channel->shm_fd >= 0 && channel->wait_fd != channel->shm_fd) { |
4c462e79 MD |
660 | ret = close(channel->shm_fd); |
661 | if (ret) { | |
662 | PERROR("close"); | |
663 | } | |
3bd1e081 | 664 | } |
702b1ea4 MD |
665 | |
666 | call_rcu(&channel->node.head, consumer_free_channel); | |
3bd1e081 MD |
667 | end: |
668 | pthread_mutex_unlock(&consumer_data.lock); | |
669 | } | |
670 | ||
671 | struct lttng_consumer_channel *consumer_allocate_channel( | |
672 | int channel_key, | |
673 | int shm_fd, int wait_fd, | |
674 | uint64_t mmap_len, | |
675 | uint64_t max_sb_size) | |
676 | { | |
677 | struct lttng_consumer_channel *channel; | |
678 | int ret; | |
679 | ||
276b26d1 | 680 | channel = zmalloc(sizeof(*channel)); |
3bd1e081 MD |
681 | if (channel == NULL) { |
682 | perror("malloc struct lttng_consumer_channel"); | |
683 | goto end; | |
684 | } | |
685 | channel->key = channel_key; | |
686 | channel->shm_fd = shm_fd; | |
687 | channel->wait_fd = wait_fd; | |
688 | channel->mmap_len = mmap_len; | |
689 | channel->max_sb_size = max_sb_size; | |
690 | channel->refcount = 0; | |
e4421fec | 691 | lttng_ht_node_init_ulong(&channel->node, channel->key); |
3bd1e081 MD |
692 | |
693 | switch (consumer_data.type) { | |
694 | case LTTNG_CONSUMER_KERNEL: | |
695 | channel->mmap_base = NULL; | |
696 | channel->mmap_len = 0; | |
697 | break; | |
7753dea8 MD |
698 | case LTTNG_CONSUMER32_UST: |
699 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
700 | ret = lttng_ustconsumer_allocate_channel(channel); |
701 | if (ret) { | |
702 | free(channel); | |
703 | return NULL; | |
704 | } | |
705 | break; | |
706 | default: | |
707 | ERR("Unknown consumer_data type"); | |
708 | assert(0); | |
709 | goto end; | |
710 | } | |
711 | DBG("Allocated channel (key %d, shm_fd %d, wait_fd %d, mmap_len %llu, max_sb_size %llu)", | |
00e2e675 | 712 | channel->key, channel->shm_fd, channel->wait_fd, |
3bd1e081 MD |
713 | (unsigned long long) channel->mmap_len, |
714 | (unsigned long long) channel->max_sb_size); | |
715 | end: | |
716 | return channel; | |
717 | } | |
718 | ||
719 | /* | |
720 | * Add a channel to the global list protected by a mutex. | |
721 | */ | |
722 | int consumer_add_channel(struct lttng_consumer_channel *channel) | |
723 | { | |
c77fc10a DG |
724 | struct lttng_ht_node_ulong *node; |
725 | struct lttng_ht_iter iter; | |
726 | ||
3bd1e081 | 727 | pthread_mutex_lock(&consumer_data.lock); |
7ad0a0cb MD |
728 | /* Steal channel identifier, for UST */ |
729 | consumer_steal_channel_key(channel->key); | |
6065ceec | 730 | rcu_read_lock(); |
c77fc10a DG |
731 | |
732 | lttng_ht_lookup(consumer_data.channel_ht, | |
733 | (void *)((unsigned long) channel->key), &iter); | |
734 | node = lttng_ht_iter_get_node_ulong(&iter); | |
735 | if (node != NULL) { | |
736 | /* Channel already exist. Ignore the insertion */ | |
737 | goto end; | |
738 | } | |
739 | ||
04253271 | 740 | lttng_ht_add_unique_ulong(consumer_data.channel_ht, &channel->node); |
c77fc10a DG |
741 | |
742 | end: | |
6065ceec | 743 | rcu_read_unlock(); |
3bd1e081 | 744 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 745 | |
7ad0a0cb | 746 | return 0; |
3bd1e081 MD |
747 | } |
748 | ||
749 | /* | |
750 | * Allocate the pollfd structure and the local view of the out fds to avoid | |
751 | * doing a lookup in the linked list and concurrency issues when writing is | |
752 | * needed. Called with consumer_data.lock held. | |
753 | * | |
754 | * Returns the number of fds in the structures. | |
755 | */ | |
756 | int consumer_update_poll_array( | |
757 | struct lttng_consumer_local_data *ctx, struct pollfd **pollfd, | |
fb3a43a9 | 758 | struct lttng_consumer_stream **local_stream) |
3bd1e081 | 759 | { |
3bd1e081 | 760 | int i = 0; |
e4421fec DG |
761 | struct lttng_ht_iter iter; |
762 | struct lttng_consumer_stream *stream; | |
3bd1e081 MD |
763 | |
764 | DBG("Updating poll fd array"); | |
481d6c57 | 765 | rcu_read_lock(); |
e4421fec DG |
766 | cds_lfht_for_each_entry(consumer_data.stream_ht->ht, &iter.iter, stream, |
767 | node.node) { | |
768 | if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM) { | |
3bd1e081 MD |
769 | continue; |
770 | } | |
e4421fec DG |
771 | DBG("Active FD %d", stream->wait_fd); |
772 | (*pollfd)[i].fd = stream->wait_fd; | |
3bd1e081 | 773 | (*pollfd)[i].events = POLLIN | POLLPRI; |
e4421fec | 774 | local_stream[i] = stream; |
3bd1e081 MD |
775 | i++; |
776 | } | |
481d6c57 | 777 | rcu_read_unlock(); |
3bd1e081 MD |
778 | |
779 | /* | |
780 | * Insert the consumer_poll_pipe at the end of the array and don't | |
781 | * increment i so nb_fd is the number of real FD. | |
782 | */ | |
783 | (*pollfd)[i].fd = ctx->consumer_poll_pipe[0]; | |
509bb1cf | 784 | (*pollfd)[i].events = POLLIN | POLLPRI; |
3bd1e081 MD |
785 | return i; |
786 | } | |
787 | ||
788 | /* | |
789 | * Poll on the should_quit pipe and the command socket return -1 on error and | |
790 | * should exit, 0 if data is available on the command socket | |
791 | */ | |
792 | int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll) | |
793 | { | |
794 | int num_rdy; | |
795 | ||
88f2b785 | 796 | restart: |
3bd1e081 MD |
797 | num_rdy = poll(consumer_sockpoll, 2, -1); |
798 | if (num_rdy == -1) { | |
88f2b785 MD |
799 | /* |
800 | * Restart interrupted system call. | |
801 | */ | |
802 | if (errno == EINTR) { | |
803 | goto restart; | |
804 | } | |
3bd1e081 MD |
805 | perror("Poll error"); |
806 | goto exit; | |
807 | } | |
509bb1cf | 808 | if (consumer_sockpoll[0].revents & (POLLIN | POLLPRI)) { |
3bd1e081 MD |
809 | DBG("consumer_should_quit wake up"); |
810 | goto exit; | |
811 | } | |
812 | return 0; | |
813 | ||
814 | exit: | |
815 | return -1; | |
816 | } | |
817 | ||
818 | /* | |
819 | * Set the error socket. | |
820 | */ | |
821 | void lttng_consumer_set_error_sock( | |
822 | struct lttng_consumer_local_data *ctx, int sock) | |
823 | { | |
824 | ctx->consumer_error_socket = sock; | |
825 | } | |
826 | ||
827 | /* | |
828 | * Set the command socket path. | |
829 | */ | |
3bd1e081 MD |
830 | void lttng_consumer_set_command_sock_path( |
831 | struct lttng_consumer_local_data *ctx, char *sock) | |
832 | { | |
833 | ctx->consumer_command_sock_path = sock; | |
834 | } | |
835 | ||
836 | /* | |
837 | * Send return code to the session daemon. | |
838 | * If the socket is not defined, we return 0, it is not a fatal error | |
839 | */ | |
840 | int lttng_consumer_send_error( | |
841 | struct lttng_consumer_local_data *ctx, int cmd) | |
842 | { | |
843 | if (ctx->consumer_error_socket > 0) { | |
844 | return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd, | |
845 | sizeof(enum lttcomm_sessiond_command)); | |
846 | } | |
847 | ||
848 | return 0; | |
849 | } | |
850 | ||
851 | /* | |
852 | * Close all the tracefiles and stream fds, should be called when all instances | |
853 | * are destroyed. | |
854 | */ | |
855 | void lttng_consumer_cleanup(void) | |
856 | { | |
e4421fec | 857 | struct lttng_ht_iter iter; |
6065ceec DG |
858 | struct lttng_ht_node_ulong *node; |
859 | ||
860 | rcu_read_lock(); | |
3bd1e081 MD |
861 | |
862 | /* | |
6065ceec DG |
863 | * close all outfd. Called when there are no more threads running (after |
864 | * joining on the threads), no need to protect list iteration with mutex. | |
3bd1e081 | 865 | */ |
6065ceec DG |
866 | cds_lfht_for_each_entry(consumer_data.stream_ht->ht, &iter.iter, node, |
867 | node) { | |
702b1ea4 MD |
868 | struct lttng_consumer_stream *stream = |
869 | caa_container_of(node, struct lttng_consumer_stream, node); | |
870 | consumer_del_stream(stream); | |
3bd1e081 | 871 | } |
e4421fec | 872 | |
6065ceec DG |
873 | cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, node, |
874 | node) { | |
702b1ea4 MD |
875 | struct lttng_consumer_channel *channel = |
876 | caa_container_of(node, struct lttng_consumer_channel, node); | |
877 | consumer_del_channel(channel); | |
3bd1e081 | 878 | } |
6065ceec DG |
879 | |
880 | rcu_read_unlock(); | |
d6ce1df2 MD |
881 | |
882 | lttng_ht_destroy(consumer_data.stream_ht); | |
883 | lttng_ht_destroy(consumer_data.channel_ht); | |
3bd1e081 MD |
884 | } |
885 | ||
886 | /* | |
887 | * Called from signal handler. | |
888 | */ | |
889 | void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx) | |
890 | { | |
891 | int ret; | |
892 | consumer_quit = 1; | |
6f94560a MD |
893 | do { |
894 | ret = write(ctx->consumer_should_quit[1], "4", 1); | |
895 | } while (ret < 0 && errno == EINTR); | |
3bd1e081 MD |
896 | if (ret < 0) { |
897 | perror("write consumer quit"); | |
898 | } | |
899 | } | |
900 | ||
00e2e675 DG |
901 | void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream, |
902 | off_t orig_offset) | |
3bd1e081 MD |
903 | { |
904 | int outfd = stream->out_fd; | |
905 | ||
906 | /* | |
907 | * This does a blocking write-and-wait on any page that belongs to the | |
908 | * subbuffer prior to the one we just wrote. | |
909 | * Don't care about error values, as these are just hints and ways to | |
910 | * limit the amount of page cache used. | |
911 | */ | |
912 | if (orig_offset < stream->chan->max_sb_size) { | |
913 | return; | |
914 | } | |
b9182dd9 | 915 | lttng_sync_file_range(outfd, orig_offset - stream->chan->max_sb_size, |
3bd1e081 MD |
916 | stream->chan->max_sb_size, |
917 | SYNC_FILE_RANGE_WAIT_BEFORE | |
918 | | SYNC_FILE_RANGE_WRITE | |
919 | | SYNC_FILE_RANGE_WAIT_AFTER); | |
920 | /* | |
921 | * Give hints to the kernel about how we access the file: | |
922 | * POSIX_FADV_DONTNEED : we won't re-access data in a near future after | |
923 | * we write it. | |
924 | * | |
925 | * We need to call fadvise again after the file grows because the | |
926 | * kernel does not seem to apply fadvise to non-existing parts of the | |
927 | * file. | |
928 | * | |
929 | * Call fadvise _after_ having waited for the page writeback to | |
930 | * complete because the dirty page writeback semantic is not well | |
931 | * defined. So it can be expected to lead to lower throughput in | |
932 | * streaming. | |
933 | */ | |
934 | posix_fadvise(outfd, orig_offset - stream->chan->max_sb_size, | |
935 | stream->chan->max_sb_size, POSIX_FADV_DONTNEED); | |
936 | } | |
937 | ||
938 | /* | |
939 | * Initialise the necessary environnement : | |
940 | * - create a new context | |
941 | * - create the poll_pipe | |
942 | * - create the should_quit pipe (for signal handler) | |
943 | * - create the thread pipe (for splice) | |
944 | * | |
945 | * Takes a function pointer as argument, this function is called when data is | |
946 | * available on a buffer. This function is responsible to do the | |
947 | * kernctl_get_next_subbuf, read the data with mmap or splice depending on the | |
948 | * buffer configuration and then kernctl_put_next_subbuf at the end. | |
949 | * | |
950 | * Returns a pointer to the new context or NULL on error. | |
951 | */ | |
952 | struct lttng_consumer_local_data *lttng_consumer_create( | |
953 | enum lttng_consumer_type type, | |
4078b776 | 954 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
d41f73b7 | 955 | struct lttng_consumer_local_data *ctx), |
3bd1e081 MD |
956 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
957 | int (*recv_stream)(struct lttng_consumer_stream *stream), | |
958 | int (*update_stream)(int stream_key, uint32_t state)) | |
959 | { | |
960 | int ret, i; | |
961 | struct lttng_consumer_local_data *ctx; | |
962 | ||
963 | assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN || | |
964 | consumer_data.type == type); | |
965 | consumer_data.type = type; | |
966 | ||
effcf122 | 967 | ctx = zmalloc(sizeof(struct lttng_consumer_local_data)); |
3bd1e081 MD |
968 | if (ctx == NULL) { |
969 | perror("allocating context"); | |
970 | goto error; | |
971 | } | |
972 | ||
973 | ctx->consumer_error_socket = -1; | |
974 | /* assign the callbacks */ | |
975 | ctx->on_buffer_ready = buffer_ready; | |
976 | ctx->on_recv_channel = recv_channel; | |
977 | ctx->on_recv_stream = recv_stream; | |
978 | ctx->on_update_stream = update_stream; | |
979 | ||
980 | ret = pipe(ctx->consumer_poll_pipe); | |
981 | if (ret < 0) { | |
982 | perror("Error creating poll pipe"); | |
983 | goto error_poll_pipe; | |
984 | } | |
985 | ||
04fdd819 MD |
986 | /* set read end of the pipe to non-blocking */ |
987 | ret = fcntl(ctx->consumer_poll_pipe[0], F_SETFL, O_NONBLOCK); | |
988 | if (ret < 0) { | |
989 | perror("fcntl O_NONBLOCK"); | |
990 | goto error_poll_fcntl; | |
991 | } | |
992 | ||
993 | /* set write end of the pipe to non-blocking */ | |
994 | ret = fcntl(ctx->consumer_poll_pipe[1], F_SETFL, O_NONBLOCK); | |
995 | if (ret < 0) { | |
996 | perror("fcntl O_NONBLOCK"); | |
997 | goto error_poll_fcntl; | |
998 | } | |
999 | ||
3bd1e081 MD |
1000 | ret = pipe(ctx->consumer_should_quit); |
1001 | if (ret < 0) { | |
1002 | perror("Error creating recv pipe"); | |
1003 | goto error_quit_pipe; | |
1004 | } | |
1005 | ||
1006 | ret = pipe(ctx->consumer_thread_pipe); | |
1007 | if (ret < 0) { | |
1008 | perror("Error creating thread pipe"); | |
1009 | goto error_thread_pipe; | |
1010 | } | |
1011 | ||
fb3a43a9 DG |
1012 | ret = utils_create_pipe(ctx->consumer_metadata_pipe); |
1013 | if (ret < 0) { | |
1014 | goto error_metadata_pipe; | |
1015 | } | |
3bd1e081 | 1016 | |
fb3a43a9 DG |
1017 | ret = utils_create_pipe(ctx->consumer_splice_metadata_pipe); |
1018 | if (ret < 0) { | |
1019 | goto error_splice_pipe; | |
1020 | } | |
1021 | ||
1022 | return ctx; | |
3bd1e081 | 1023 | |
fb3a43a9 DG |
1024 | error_splice_pipe: |
1025 | utils_close_pipe(ctx->consumer_metadata_pipe); | |
1026 | error_metadata_pipe: | |
1027 | utils_close_pipe(ctx->consumer_thread_pipe); | |
3bd1e081 MD |
1028 | error_thread_pipe: |
1029 | for (i = 0; i < 2; i++) { | |
1030 | int err; | |
1031 | ||
1032 | err = close(ctx->consumer_should_quit[i]); | |
4c462e79 MD |
1033 | if (err) { |
1034 | PERROR("close"); | |
1035 | } | |
3bd1e081 | 1036 | } |
04fdd819 | 1037 | error_poll_fcntl: |
3bd1e081 MD |
1038 | error_quit_pipe: |
1039 | for (i = 0; i < 2; i++) { | |
1040 | int err; | |
1041 | ||
1042 | err = close(ctx->consumer_poll_pipe[i]); | |
4c462e79 MD |
1043 | if (err) { |
1044 | PERROR("close"); | |
1045 | } | |
3bd1e081 MD |
1046 | } |
1047 | error_poll_pipe: | |
1048 | free(ctx); | |
1049 | error: | |
1050 | return NULL; | |
1051 | } | |
1052 | ||
1053 | /* | |
1054 | * Close all fds associated with the instance and free the context. | |
1055 | */ | |
1056 | void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx) | |
1057 | { | |
4c462e79 MD |
1058 | int ret; |
1059 | ||
1060 | ret = close(ctx->consumer_error_socket); | |
1061 | if (ret) { | |
1062 | PERROR("close"); | |
1063 | } | |
1064 | ret = close(ctx->consumer_thread_pipe[0]); | |
1065 | if (ret) { | |
1066 | PERROR("close"); | |
1067 | } | |
1068 | ret = close(ctx->consumer_thread_pipe[1]); | |
1069 | if (ret) { | |
1070 | PERROR("close"); | |
1071 | } | |
1072 | ret = close(ctx->consumer_poll_pipe[0]); | |
1073 | if (ret) { | |
1074 | PERROR("close"); | |
1075 | } | |
1076 | ret = close(ctx->consumer_poll_pipe[1]); | |
1077 | if (ret) { | |
1078 | PERROR("close"); | |
1079 | } | |
1080 | ret = close(ctx->consumer_should_quit[0]); | |
1081 | if (ret) { | |
1082 | PERROR("close"); | |
1083 | } | |
1084 | ret = close(ctx->consumer_should_quit[1]); | |
1085 | if (ret) { | |
1086 | PERROR("close"); | |
1087 | } | |
fb3a43a9 DG |
1088 | utils_close_pipe(ctx->consumer_splice_metadata_pipe); |
1089 | ||
3bd1e081 MD |
1090 | unlink(ctx->consumer_command_sock_path); |
1091 | free(ctx); | |
1092 | } | |
1093 | ||
6197aea7 DG |
1094 | /* |
1095 | * Write the metadata stream id on the specified file descriptor. | |
1096 | */ | |
1097 | static int write_relayd_metadata_id(int fd, | |
1098 | struct lttng_consumer_stream *stream, | |
1d4dfdef DG |
1099 | struct consumer_relayd_sock_pair *relayd, |
1100 | unsigned long padding) | |
6197aea7 DG |
1101 | { |
1102 | int ret; | |
1d4dfdef | 1103 | struct lttcomm_relayd_metadata_payload hdr; |
6197aea7 | 1104 | |
1d4dfdef DG |
1105 | hdr.stream_id = htobe64(stream->relayd_stream_id); |
1106 | hdr.padding_size = htobe32(padding); | |
6197aea7 | 1107 | do { |
1d4dfdef | 1108 | ret = write(fd, (void *) &hdr, sizeof(hdr)); |
6197aea7 DG |
1109 | } while (ret < 0 && errno == EINTR); |
1110 | if (ret < 0) { | |
1111 | PERROR("write metadata stream id"); | |
1112 | goto end; | |
1113 | } | |
1d4dfdef DG |
1114 | DBG("Metadata stream id %" PRIu64 " with padding %lu written before data", |
1115 | stream->relayd_stream_id, padding); | |
6197aea7 DG |
1116 | |
1117 | end: | |
1118 | return ret; | |
1119 | } | |
1120 | ||
3bd1e081 | 1121 | /* |
09e26845 DG |
1122 | * Mmap the ring buffer, read it and write the data to the tracefile. This is a |
1123 | * core function for writing trace buffers to either the local filesystem or | |
1124 | * the network. | |
1125 | * | |
1126 | * Careful review MUST be put if any changes occur! | |
3bd1e081 MD |
1127 | * |
1128 | * Returns the number of bytes written | |
1129 | */ | |
4078b776 | 1130 | ssize_t lttng_consumer_on_read_subbuffer_mmap( |
3bd1e081 | 1131 | struct lttng_consumer_local_data *ctx, |
1d4dfdef DG |
1132 | struct lttng_consumer_stream *stream, unsigned long len, |
1133 | unsigned long padding) | |
3bd1e081 | 1134 | { |
f02e1e8a DG |
1135 | unsigned long mmap_offset; |
1136 | ssize_t ret = 0, written = 0; | |
1137 | off_t orig_offset = stream->out_fd_offset; | |
1138 | /* Default is on the disk */ | |
1139 | int outfd = stream->out_fd; | |
f02e1e8a DG |
1140 | struct consumer_relayd_sock_pair *relayd = NULL; |
1141 | ||
1142 | /* RCU lock for the relayd pointer */ | |
1143 | rcu_read_lock(); | |
1144 | ||
1145 | /* Flag that the current stream if set for network streaming. */ | |
1146 | if (stream->net_seq_idx != -1) { | |
1147 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1148 | if (relayd == NULL) { | |
1149 | goto end; | |
1150 | } | |
1151 | } | |
1152 | ||
1153 | /* get the offset inside the fd to mmap */ | |
3bd1e081 MD |
1154 | switch (consumer_data.type) { |
1155 | case LTTNG_CONSUMER_KERNEL: | |
f02e1e8a DG |
1156 | ret = kernctl_get_mmap_read_offset(stream->wait_fd, &mmap_offset); |
1157 | break; | |
7753dea8 MD |
1158 | case LTTNG_CONSUMER32_UST: |
1159 | case LTTNG_CONSUMER64_UST: | |
f02e1e8a DG |
1160 | ret = lttng_ustctl_get_mmap_read_offset(stream->chan->handle, |
1161 | stream->buf, &mmap_offset); | |
1162 | break; | |
3bd1e081 MD |
1163 | default: |
1164 | ERR("Unknown consumer_data type"); | |
1165 | assert(0); | |
1166 | } | |
f02e1e8a DG |
1167 | if (ret != 0) { |
1168 | errno = -ret; | |
1169 | PERROR("tracer ctl get_mmap_read_offset"); | |
1170 | written = ret; | |
1171 | goto end; | |
1172 | } | |
b9182dd9 | 1173 | |
f02e1e8a DG |
1174 | /* Handle stream on the relayd if the output is on the network */ |
1175 | if (relayd) { | |
1176 | unsigned long netlen = len; | |
1177 | ||
1178 | /* | |
1179 | * Lock the control socket for the complete duration of the function | |
1180 | * since from this point on we will use the socket. | |
1181 | */ | |
1182 | if (stream->metadata_flag) { | |
1183 | /* Metadata requires the control socket. */ | |
1184 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1d4dfdef | 1185 | netlen += sizeof(struct lttcomm_relayd_metadata_payload); |
f02e1e8a DG |
1186 | } |
1187 | ||
1d4dfdef | 1188 | ret = write_relayd_stream_header(stream, netlen, padding, relayd); |
f02e1e8a DG |
1189 | if (ret >= 0) { |
1190 | /* Use the returned socket. */ | |
1191 | outfd = ret; | |
1192 | ||
1193 | /* Write metadata stream id before payload */ | |
1194 | if (stream->metadata_flag) { | |
1d4dfdef | 1195 | ret = write_relayd_metadata_id(outfd, stream, relayd, padding); |
f02e1e8a | 1196 | if (ret < 0) { |
f02e1e8a DG |
1197 | written = ret; |
1198 | goto end; | |
1199 | } | |
f02e1e8a DG |
1200 | } |
1201 | } | |
1202 | /* Else, use the default set before which is the filesystem. */ | |
1d4dfdef DG |
1203 | } else { |
1204 | /* No streaming, we have to set the len with the full padding */ | |
1205 | len += padding; | |
f02e1e8a DG |
1206 | } |
1207 | ||
1208 | while (len > 0) { | |
1209 | do { | |
1210 | ret = write(outfd, stream->mmap_base + mmap_offset, len); | |
1211 | } while (ret < 0 && errno == EINTR); | |
1d4dfdef | 1212 | DBG("Consumer mmap write() ret %zd (len %lu)", ret, len); |
f02e1e8a DG |
1213 | if (ret < 0) { |
1214 | PERROR("Error in file write"); | |
1215 | if (written == 0) { | |
1216 | written = ret; | |
1217 | } | |
1218 | goto end; | |
1219 | } else if (ret > len) { | |
77c7c900 | 1220 | PERROR("Error in file write (ret %zd > len %lu)", ret, len); |
f02e1e8a DG |
1221 | written += ret; |
1222 | goto end; | |
1223 | } else { | |
1224 | len -= ret; | |
1225 | mmap_offset += ret; | |
1226 | } | |
f02e1e8a DG |
1227 | |
1228 | /* This call is useless on a socket so better save a syscall. */ | |
1229 | if (!relayd) { | |
1230 | /* This won't block, but will start writeout asynchronously */ | |
1231 | lttng_sync_file_range(outfd, stream->out_fd_offset, ret, | |
1232 | SYNC_FILE_RANGE_WRITE); | |
1233 | stream->out_fd_offset += ret; | |
1234 | } | |
1235 | written += ret; | |
1236 | } | |
1237 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
1238 | ||
1239 | end: | |
1240 | /* Unlock only if ctrl socket used */ | |
1241 | if (relayd && stream->metadata_flag) { | |
1242 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1243 | } | |
1244 | ||
1245 | rcu_read_unlock(); | |
1246 | return written; | |
3bd1e081 MD |
1247 | } |
1248 | ||
1249 | /* | |
1250 | * Splice the data from the ring buffer to the tracefile. | |
1251 | * | |
1252 | * Returns the number of bytes spliced. | |
1253 | */ | |
4078b776 | 1254 | ssize_t lttng_consumer_on_read_subbuffer_splice( |
3bd1e081 | 1255 | struct lttng_consumer_local_data *ctx, |
1d4dfdef DG |
1256 | struct lttng_consumer_stream *stream, unsigned long len, |
1257 | unsigned long padding) | |
3bd1e081 | 1258 | { |
f02e1e8a DG |
1259 | ssize_t ret = 0, written = 0, ret_splice = 0; |
1260 | loff_t offset = 0; | |
1261 | off_t orig_offset = stream->out_fd_offset; | |
1262 | int fd = stream->wait_fd; | |
1263 | /* Default is on the disk */ | |
1264 | int outfd = stream->out_fd; | |
f02e1e8a | 1265 | struct consumer_relayd_sock_pair *relayd = NULL; |
fb3a43a9 | 1266 | int *splice_pipe; |
f02e1e8a | 1267 | |
3bd1e081 MD |
1268 | switch (consumer_data.type) { |
1269 | case LTTNG_CONSUMER_KERNEL: | |
f02e1e8a | 1270 | break; |
7753dea8 MD |
1271 | case LTTNG_CONSUMER32_UST: |
1272 | case LTTNG_CONSUMER64_UST: | |
f02e1e8a | 1273 | /* Not supported for user space tracing */ |
3bd1e081 MD |
1274 | return -ENOSYS; |
1275 | default: | |
1276 | ERR("Unknown consumer_data type"); | |
1277 | assert(0); | |
3bd1e081 MD |
1278 | } |
1279 | ||
f02e1e8a DG |
1280 | /* RCU lock for the relayd pointer */ |
1281 | rcu_read_lock(); | |
1282 | ||
1283 | /* Flag that the current stream if set for network streaming. */ | |
1284 | if (stream->net_seq_idx != -1) { | |
1285 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1286 | if (relayd == NULL) { | |
1287 | goto end; | |
1288 | } | |
1289 | } | |
1290 | ||
fb3a43a9 DG |
1291 | /* |
1292 | * Choose right pipe for splice. Metadata and trace data are handled by | |
1293 | * different threads hence the use of two pipes in order not to race or | |
1294 | * corrupt the written data. | |
1295 | */ | |
1296 | if (stream->metadata_flag) { | |
1297 | splice_pipe = ctx->consumer_splice_metadata_pipe; | |
1298 | } else { | |
1299 | splice_pipe = ctx->consumer_thread_pipe; | |
1300 | } | |
1301 | ||
f02e1e8a | 1302 | /* Write metadata stream id before payload */ |
1d4dfdef DG |
1303 | if (relayd) { |
1304 | int total_len = len; | |
f02e1e8a | 1305 | |
1d4dfdef DG |
1306 | if (stream->metadata_flag) { |
1307 | /* | |
1308 | * Lock the control socket for the complete duration of the function | |
1309 | * since from this point on we will use the socket. | |
1310 | */ | |
1311 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1312 | ||
1313 | ret = write_relayd_metadata_id(splice_pipe[1], stream, relayd, | |
1314 | padding); | |
1315 | if (ret < 0) { | |
1316 | written = ret; | |
1317 | goto end; | |
1318 | } | |
1319 | ||
1320 | total_len += sizeof(struct lttcomm_relayd_metadata_payload); | |
1321 | } | |
1322 | ||
1323 | ret = write_relayd_stream_header(stream, total_len, padding, relayd); | |
1324 | if (ret >= 0) { | |
1325 | /* Use the returned socket. */ | |
1326 | outfd = ret; | |
1327 | } else { | |
1328 | ERR("Remote relayd disconnected. Stopping"); | |
f02e1e8a DG |
1329 | goto end; |
1330 | } | |
1d4dfdef DG |
1331 | } else { |
1332 | /* No streaming, we have to set the len with the full padding */ | |
1333 | len += padding; | |
f02e1e8a DG |
1334 | } |
1335 | ||
1336 | while (len > 0) { | |
1d4dfdef DG |
1337 | DBG("splice chan to pipe offset %lu of len %lu (fd : %d, pipe: %d)", |
1338 | (unsigned long)offset, len, fd, splice_pipe[1]); | |
fb3a43a9 | 1339 | ret_splice = splice(fd, &offset, splice_pipe[1], NULL, len, |
f02e1e8a DG |
1340 | SPLICE_F_MOVE | SPLICE_F_MORE); |
1341 | DBG("splice chan to pipe, ret %zd", ret_splice); | |
1342 | if (ret_splice < 0) { | |
1343 | PERROR("Error in relay splice"); | |
1344 | if (written == 0) { | |
1345 | written = ret_splice; | |
1346 | } | |
1347 | ret = errno; | |
1348 | goto splice_error; | |
1349 | } | |
1350 | ||
1351 | /* Handle stream on the relayd if the output is on the network */ | |
1352 | if (relayd) { | |
1353 | if (stream->metadata_flag) { | |
1d4dfdef DG |
1354 | size_t metadata_payload_size = |
1355 | sizeof(struct lttcomm_relayd_metadata_payload); | |
1356 | ||
f02e1e8a | 1357 | /* Update counter to fit the spliced data */ |
1d4dfdef DG |
1358 | ret_splice += metadata_payload_size; |
1359 | len += metadata_payload_size; | |
f02e1e8a DG |
1360 | /* |
1361 | * We do this so the return value can match the len passed as | |
1362 | * argument to this function. | |
1363 | */ | |
1d4dfdef | 1364 | written -= metadata_payload_size; |
f02e1e8a DG |
1365 | } |
1366 | } | |
1367 | ||
1368 | /* Splice data out */ | |
fb3a43a9 | 1369 | ret_splice = splice(splice_pipe[0], NULL, outfd, NULL, |
f02e1e8a | 1370 | ret_splice, SPLICE_F_MOVE | SPLICE_F_MORE); |
1d4dfdef | 1371 | DBG("Consumer splice pipe to file, ret %zd", ret_splice); |
f02e1e8a DG |
1372 | if (ret_splice < 0) { |
1373 | PERROR("Error in file splice"); | |
1374 | if (written == 0) { | |
1375 | written = ret_splice; | |
1376 | } | |
1377 | ret = errno; | |
1378 | goto splice_error; | |
1379 | } else if (ret_splice > len) { | |
1380 | errno = EINVAL; | |
1381 | PERROR("Wrote more data than requested %zd (len: %lu)", | |
1382 | ret_splice, len); | |
1383 | written += ret_splice; | |
1384 | ret = errno; | |
1385 | goto splice_error; | |
1386 | } | |
1387 | len -= ret_splice; | |
1388 | ||
1389 | /* This call is useless on a socket so better save a syscall. */ | |
1390 | if (!relayd) { | |
1391 | /* This won't block, but will start writeout asynchronously */ | |
1392 | lttng_sync_file_range(outfd, stream->out_fd_offset, ret_splice, | |
1393 | SYNC_FILE_RANGE_WRITE); | |
1394 | stream->out_fd_offset += ret_splice; | |
1395 | } | |
1396 | written += ret_splice; | |
1397 | } | |
1398 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
1399 | ||
1400 | ret = ret_splice; | |
1401 | ||
1402 | goto end; | |
1403 | ||
1404 | splice_error: | |
1405 | /* send the appropriate error description to sessiond */ | |
1406 | switch (ret) { | |
1407 | case EBADF: | |
f73fabfd | 1408 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_EBADF); |
f02e1e8a DG |
1409 | break; |
1410 | case EINVAL: | |
f73fabfd | 1411 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_EINVAL); |
f02e1e8a DG |
1412 | break; |
1413 | case ENOMEM: | |
f73fabfd | 1414 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ENOMEM); |
f02e1e8a DG |
1415 | break; |
1416 | case ESPIPE: | |
f73fabfd | 1417 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ESPIPE); |
f02e1e8a DG |
1418 | break; |
1419 | } | |
1420 | ||
1421 | end: | |
1422 | if (relayd && stream->metadata_flag) { | |
1423 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1424 | } | |
1425 | ||
1426 | rcu_read_unlock(); | |
1427 | return written; | |
3bd1e081 MD |
1428 | } |
1429 | ||
1430 | /* | |
1431 | * Take a snapshot for a specific fd | |
1432 | * | |
1433 | * Returns 0 on success, < 0 on error | |
1434 | */ | |
1435 | int lttng_consumer_take_snapshot(struct lttng_consumer_local_data *ctx, | |
1436 | struct lttng_consumer_stream *stream) | |
1437 | { | |
1438 | switch (consumer_data.type) { | |
1439 | case LTTNG_CONSUMER_KERNEL: | |
1440 | return lttng_kconsumer_take_snapshot(ctx, stream); | |
7753dea8 MD |
1441 | case LTTNG_CONSUMER32_UST: |
1442 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1443 | return lttng_ustconsumer_take_snapshot(ctx, stream); |
1444 | default: | |
1445 | ERR("Unknown consumer_data type"); | |
1446 | assert(0); | |
1447 | return -ENOSYS; | |
1448 | } | |
1449 | ||
1450 | } | |
1451 | ||
1452 | /* | |
1453 | * Get the produced position | |
1454 | * | |
1455 | * Returns 0 on success, < 0 on error | |
1456 | */ | |
1457 | int lttng_consumer_get_produced_snapshot( | |
1458 | struct lttng_consumer_local_data *ctx, | |
1459 | struct lttng_consumer_stream *stream, | |
1460 | unsigned long *pos) | |
1461 | { | |
1462 | switch (consumer_data.type) { | |
1463 | case LTTNG_CONSUMER_KERNEL: | |
1464 | return lttng_kconsumer_get_produced_snapshot(ctx, stream, pos); | |
7753dea8 MD |
1465 | case LTTNG_CONSUMER32_UST: |
1466 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1467 | return lttng_ustconsumer_get_produced_snapshot(ctx, stream, pos); |
1468 | default: | |
1469 | ERR("Unknown consumer_data type"); | |
1470 | assert(0); | |
1471 | return -ENOSYS; | |
1472 | } | |
1473 | } | |
1474 | ||
1475 | int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, | |
1476 | int sock, struct pollfd *consumer_sockpoll) | |
1477 | { | |
1478 | switch (consumer_data.type) { | |
1479 | case LTTNG_CONSUMER_KERNEL: | |
1480 | return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
7753dea8 MD |
1481 | case LTTNG_CONSUMER32_UST: |
1482 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1483 | return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll); |
1484 | default: | |
1485 | ERR("Unknown consumer_data type"); | |
1486 | assert(0); | |
1487 | return -ENOSYS; | |
1488 | } | |
1489 | } | |
1490 | ||
fb3a43a9 DG |
1491 | /* |
1492 | * Iterate over all stream element of the hashtable and free them. This is race | |
1493 | * free since the hashtable received MUST be in a race free synchronization | |
1494 | * state. It's the caller responsability to make sure of that. | |
1495 | */ | |
1496 | static void destroy_stream_ht(struct lttng_ht *ht) | |
1497 | { | |
1498 | int ret; | |
1499 | struct lttng_ht_iter iter; | |
1500 | struct lttng_consumer_stream *stream; | |
1501 | ||
1502 | if (ht == NULL) { | |
1503 | return; | |
1504 | } | |
1505 | ||
1506 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { | |
1507 | ret = lttng_ht_del(ht, &iter); | |
1508 | assert(!ret); | |
1509 | ||
1510 | free(stream); | |
1511 | } | |
1512 | ||
1513 | lttng_ht_destroy(ht); | |
1514 | } | |
1515 | ||
1516 | /* | |
1517 | * Clean up a metadata stream and free its memory. | |
1518 | */ | |
1519 | static void consumer_del_metadata_stream(struct lttng_consumer_stream *stream) | |
1520 | { | |
1521 | int ret; | |
1522 | struct lttng_consumer_channel *free_chan = NULL; | |
1523 | struct consumer_relayd_sock_pair *relayd; | |
1524 | ||
1525 | assert(stream); | |
1526 | /* | |
1527 | * This call should NEVER receive regular stream. It must always be | |
1528 | * metadata stream and this is crucial for data structure synchronization. | |
1529 | */ | |
1530 | assert(stream->metadata_flag); | |
1531 | ||
1532 | pthread_mutex_lock(&consumer_data.lock); | |
1533 | switch (consumer_data.type) { | |
1534 | case LTTNG_CONSUMER_KERNEL: | |
1535 | if (stream->mmap_base != NULL) { | |
1536 | ret = munmap(stream->mmap_base, stream->mmap_len); | |
1537 | if (ret != 0) { | |
1538 | PERROR("munmap metadata stream"); | |
1539 | } | |
1540 | } | |
1541 | break; | |
1542 | case LTTNG_CONSUMER32_UST: | |
1543 | case LTTNG_CONSUMER64_UST: | |
1544 | lttng_ustconsumer_del_stream(stream); | |
1545 | break; | |
1546 | default: | |
1547 | ERR("Unknown consumer_data type"); | |
1548 | assert(0); | |
1549 | } | |
1550 | pthread_mutex_unlock(&consumer_data.lock); | |
1551 | ||
1552 | if (stream->out_fd >= 0) { | |
1553 | ret = close(stream->out_fd); | |
1554 | if (ret) { | |
1555 | PERROR("close"); | |
1556 | } | |
1557 | } | |
1558 | ||
1559 | if (stream->wait_fd >= 0 && !stream->wait_fd_is_copy) { | |
1560 | ret = close(stream->wait_fd); | |
1561 | if (ret) { | |
1562 | PERROR("close"); | |
1563 | } | |
1564 | } | |
1565 | ||
1566 | if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) { | |
1567 | ret = close(stream->shm_fd); | |
1568 | if (ret) { | |
1569 | PERROR("close"); | |
1570 | } | |
1571 | } | |
1572 | ||
1573 | /* Check and cleanup relayd */ | |
1574 | rcu_read_lock(); | |
1575 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1576 | if (relayd != NULL) { | |
1577 | uatomic_dec(&relayd->refcount); | |
1578 | assert(uatomic_read(&relayd->refcount) >= 0); | |
1579 | ||
1580 | /* Closing streams requires to lock the control socket. */ | |
1581 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1582 | ret = relayd_send_close_stream(&relayd->control_sock, | |
1583 | stream->relayd_stream_id, stream->next_net_seq_num - 1); | |
1584 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1585 | if (ret < 0) { | |
1586 | DBG("Unable to close stream on the relayd. Continuing"); | |
1587 | /* | |
1588 | * Continue here. There is nothing we can do for the relayd. | |
1589 | * Chances are that the relayd has closed the socket so we just | |
1590 | * continue cleaning up. | |
1591 | */ | |
1592 | } | |
1593 | ||
1594 | /* Both conditions are met, we destroy the relayd. */ | |
1595 | if (uatomic_read(&relayd->refcount) == 0 && | |
1596 | uatomic_read(&relayd->destroy_flag)) { | |
1597 | consumer_destroy_relayd(relayd); | |
1598 | } | |
1599 | } | |
1600 | rcu_read_unlock(); | |
1601 | ||
1602 | /* Atomically decrement channel refcount since other threads can use it. */ | |
1603 | uatomic_dec(&stream->chan->refcount); | |
1604 | if (!uatomic_read(&stream->chan->refcount)) { | |
1605 | free_chan = stream->chan; | |
1606 | } | |
1607 | ||
1608 | if (free_chan) { | |
1609 | consumer_del_channel(free_chan); | |
1610 | } | |
1611 | ||
1612 | free(stream); | |
1613 | } | |
1614 | ||
1615 | /* | |
1616 | * Action done with the metadata stream when adding it to the consumer internal | |
1617 | * data structures to handle it. | |
1618 | */ | |
1619 | static void consumer_add_metadata_stream(struct lttng_consumer_stream *stream) | |
1620 | { | |
1621 | struct consumer_relayd_sock_pair *relayd; | |
1622 | ||
1623 | /* Find relayd and, if one is found, increment refcount. */ | |
1624 | rcu_read_lock(); | |
1625 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1626 | if (relayd != NULL) { | |
1627 | uatomic_inc(&relayd->refcount); | |
1628 | } | |
1629 | rcu_read_unlock(); | |
1630 | } | |
1631 | ||
1632 | /* | |
1633 | * Thread polls on metadata file descriptor and write them on disk or on the | |
1634 | * network. | |
1635 | */ | |
1636 | void *lttng_consumer_thread_poll_metadata(void *data) | |
1637 | { | |
1638 | int ret, i, pollfd; | |
1639 | uint32_t revents, nb_fd; | |
1640 | struct lttng_consumer_stream *stream; | |
1641 | struct lttng_ht_iter iter; | |
1642 | struct lttng_ht_node_ulong *node; | |
1643 | struct lttng_ht *metadata_ht = NULL; | |
1644 | struct lttng_poll_event events; | |
1645 | struct lttng_consumer_local_data *ctx = data; | |
1646 | ssize_t len; | |
1647 | ||
1648 | rcu_register_thread(); | |
1649 | ||
1650 | DBG("Thread metadata poll started"); | |
1651 | ||
1652 | metadata_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
1653 | if (metadata_ht == NULL) { | |
1654 | goto end; | |
1655 | } | |
1656 | ||
1657 | /* Size is set to 1 for the consumer_metadata pipe */ | |
1658 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
1659 | if (ret < 0) { | |
1660 | ERR("Poll set creation failed"); | |
1661 | goto end; | |
1662 | } | |
1663 | ||
1664 | ret = lttng_poll_add(&events, ctx->consumer_metadata_pipe[0], LPOLLIN); | |
1665 | if (ret < 0) { | |
1666 | goto end; | |
1667 | } | |
1668 | ||
1669 | /* Main loop */ | |
1670 | DBG("Metadata main loop started"); | |
1671 | ||
1672 | while (1) { | |
1673 | lttng_poll_reset(&events); | |
1674 | ||
1675 | nb_fd = LTTNG_POLL_GETNB(&events); | |
1676 | ||
1677 | /* Only the metadata pipe is set */ | |
1678 | if (nb_fd == 0 && consumer_quit == 1) { | |
1679 | goto end; | |
1680 | } | |
1681 | ||
1682 | restart: | |
1683 | DBG("Metadata poll wait with %d fd(s)", nb_fd); | |
1684 | ret = lttng_poll_wait(&events, -1); | |
1685 | DBG("Metadata event catched in thread"); | |
1686 | if (ret < 0) { | |
1687 | if (errno == EINTR) { | |
1688 | goto restart; | |
1689 | } | |
1690 | goto error; | |
1691 | } | |
1692 | ||
1693 | for (i = 0; i < nb_fd; i++) { | |
1694 | revents = LTTNG_POLL_GETEV(&events, i); | |
1695 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1696 | ||
1697 | /* Check the metadata pipe for incoming metadata. */ | |
1698 | if (pollfd == ctx->consumer_metadata_pipe[0]) { | |
1699 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLNVAL)) { | |
1700 | DBG("Metadata thread pipe hung up"); | |
1701 | /* | |
1702 | * Remove the pipe from the poll set and continue the loop | |
1703 | * since their might be data to consume. | |
1704 | */ | |
1705 | lttng_poll_del(&events, ctx->consumer_metadata_pipe[0]); | |
1706 | close(ctx->consumer_metadata_pipe[0]); | |
1707 | continue; | |
1708 | } else if (revents & LPOLLIN) { | |
1709 | stream = zmalloc(sizeof(struct lttng_consumer_stream)); | |
1710 | if (stream == NULL) { | |
1711 | PERROR("zmalloc metadata consumer stream"); | |
1712 | goto error; | |
1713 | } | |
1714 | ||
1715 | do { | |
1716 | /* Get the stream and add it to the local hash table */ | |
1717 | ret = read(pollfd, stream, | |
1718 | sizeof(struct lttng_consumer_stream)); | |
1719 | } while (ret < 0 && errno == EINTR); | |
1720 | if (ret < 0 || ret < sizeof(struct lttng_consumer_stream)) { | |
1721 | PERROR("read metadata stream"); | |
1722 | free(stream); | |
1723 | /* | |
1724 | * Let's continue here and hope we can still work | |
1725 | * without stopping the consumer. XXX: Should we? | |
1726 | */ | |
1727 | continue; | |
1728 | } | |
1729 | ||
1730 | DBG("Adding metadata stream %d to poll set", | |
1731 | stream->wait_fd); | |
1732 | ||
1733 | /* The node should be init at this point */ | |
1734 | lttng_ht_add_unique_ulong(metadata_ht, | |
1735 | &stream->waitfd_node); | |
1736 | ||
1737 | /* Add metadata stream to the global poll events list */ | |
1738 | lttng_poll_add(&events, stream->wait_fd, | |
1739 | LPOLLIN | LPOLLPRI); | |
1740 | ||
1741 | consumer_add_metadata_stream(stream); | |
1742 | } | |
1743 | ||
1744 | /* Metadata pipe handled. Continue handling the others */ | |
1745 | continue; | |
1746 | } | |
1747 | ||
1748 | /* From here, the event is a metadata wait fd */ | |
1749 | ||
1750 | lttng_ht_lookup(metadata_ht, (void *)((unsigned long) pollfd), | |
1751 | &iter); | |
1752 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1753 | if (node == NULL) { | |
1754 | /* FD not found, continue loop */ | |
1755 | continue; | |
1756 | } | |
1757 | ||
1758 | stream = caa_container_of(node, struct lttng_consumer_stream, | |
1759 | waitfd_node); | |
1760 | ||
1761 | /* Get the data out of the metadata file descriptor */ | |
1762 | if (revents & (LPOLLIN | LPOLLPRI)) { | |
1763 | DBG("Metadata available on fd %d", pollfd); | |
1764 | assert(stream->wait_fd == pollfd); | |
1765 | ||
1766 | len = ctx->on_buffer_ready(stream, ctx); | |
1767 | /* It's ok to have an unavailable sub-buffer */ | |
1768 | if (len < 0 && len != -EAGAIN) { | |
1769 | goto end; | |
1770 | } else if (len > 0) { | |
1771 | stream->data_read = 1; | |
1772 | } | |
1773 | } | |
1774 | ||
1775 | /* | |
1776 | * Remove the stream from the hash table since there is no data | |
1777 | * left on the fd because we previously did a read on the buffer. | |
1778 | */ | |
1779 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLNVAL)) { | |
1780 | DBG("Metadata fd %d is hup|err|nval.", pollfd); | |
1781 | if (!stream->hangup_flush_done | |
1782 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
1783 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
1784 | DBG("Attempting to flush and consume the UST buffers"); | |
1785 | lttng_ustconsumer_on_stream_hangup(stream); | |
1786 | ||
1787 | /* We just flushed the stream now read it. */ | |
1788 | len = ctx->on_buffer_ready(stream, ctx); | |
1789 | /* It's ok to have an unavailable sub-buffer */ | |
1790 | if (len < 0 && len != -EAGAIN) { | |
1791 | goto end; | |
1792 | } | |
1793 | } | |
1794 | ||
1795 | /* Removing it from hash table, poll set and free memory */ | |
1796 | lttng_ht_del(metadata_ht, &iter); | |
1797 | lttng_poll_del(&events, stream->wait_fd); | |
1798 | consumer_del_metadata_stream(stream); | |
1799 | } | |
1800 | } | |
1801 | } | |
1802 | ||
1803 | error: | |
1804 | end: | |
1805 | DBG("Metadata poll thread exiting"); | |
1806 | lttng_poll_clean(&events); | |
1807 | ||
1808 | if (metadata_ht) { | |
1809 | destroy_stream_ht(metadata_ht); | |
1810 | } | |
1811 | ||
1812 | rcu_unregister_thread(); | |
1813 | return NULL; | |
1814 | } | |
1815 | ||
3bd1e081 | 1816 | /* |
e4421fec | 1817 | * This thread polls the fds in the set to consume the data and write |
3bd1e081 MD |
1818 | * it to tracefile if necessary. |
1819 | */ | |
1820 | void *lttng_consumer_thread_poll_fds(void *data) | |
1821 | { | |
1822 | int num_rdy, num_hup, high_prio, ret, i; | |
1823 | struct pollfd *pollfd = NULL; | |
1824 | /* local view of the streams */ | |
1825 | struct lttng_consumer_stream **local_stream = NULL; | |
1826 | /* local view of consumer_data.fds_count */ | |
1827 | int nb_fd = 0; | |
3bd1e081 | 1828 | struct lttng_consumer_local_data *ctx = data; |
00e2e675 | 1829 | ssize_t len; |
fb3a43a9 DG |
1830 | pthread_t metadata_thread; |
1831 | void *status; | |
3bd1e081 | 1832 | |
e7b994a3 DG |
1833 | rcu_register_thread(); |
1834 | ||
fb3a43a9 DG |
1835 | /* Start metadata polling thread */ |
1836 | ret = pthread_create(&metadata_thread, NULL, | |
1837 | lttng_consumer_thread_poll_metadata, (void *) ctx); | |
1838 | if (ret < 0) { | |
1839 | PERROR("pthread_create metadata thread"); | |
1840 | goto end; | |
1841 | } | |
1842 | ||
effcf122 | 1843 | local_stream = zmalloc(sizeof(struct lttng_consumer_stream)); |
3bd1e081 MD |
1844 | |
1845 | while (1) { | |
1846 | high_prio = 0; | |
1847 | num_hup = 0; | |
1848 | ||
1849 | /* | |
e4421fec | 1850 | * the fds set has been updated, we need to update our |
3bd1e081 MD |
1851 | * local array as well |
1852 | */ | |
1853 | pthread_mutex_lock(&consumer_data.lock); | |
1854 | if (consumer_data.need_update) { | |
1855 | if (pollfd != NULL) { | |
1856 | free(pollfd); | |
1857 | pollfd = NULL; | |
1858 | } | |
1859 | if (local_stream != NULL) { | |
1860 | free(local_stream); | |
1861 | local_stream = NULL; | |
1862 | } | |
1863 | ||
1864 | /* allocate for all fds + 1 for the consumer_poll_pipe */ | |
effcf122 | 1865 | pollfd = zmalloc((consumer_data.stream_count + 1) * sizeof(struct pollfd)); |
3bd1e081 MD |
1866 | if (pollfd == NULL) { |
1867 | perror("pollfd malloc"); | |
1868 | pthread_mutex_unlock(&consumer_data.lock); | |
1869 | goto end; | |
1870 | } | |
1871 | ||
1872 | /* allocate for all fds + 1 for the consumer_poll_pipe */ | |
effcf122 | 1873 | local_stream = zmalloc((consumer_data.stream_count + 1) * |
3bd1e081 MD |
1874 | sizeof(struct lttng_consumer_stream)); |
1875 | if (local_stream == NULL) { | |
1876 | perror("local_stream malloc"); | |
1877 | pthread_mutex_unlock(&consumer_data.lock); | |
1878 | goto end; | |
1879 | } | |
fb3a43a9 | 1880 | ret = consumer_update_poll_array(ctx, &pollfd, local_stream); |
3bd1e081 MD |
1881 | if (ret < 0) { |
1882 | ERR("Error in allocating pollfd or local_outfds"); | |
f73fabfd | 1883 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
1884 | pthread_mutex_unlock(&consumer_data.lock); |
1885 | goto end; | |
1886 | } | |
1887 | nb_fd = ret; | |
1888 | consumer_data.need_update = 0; | |
1889 | } | |
1890 | pthread_mutex_unlock(&consumer_data.lock); | |
1891 | ||
4078b776 MD |
1892 | /* No FDs and consumer_quit, consumer_cleanup the thread */ |
1893 | if (nb_fd == 0 && consumer_quit == 1) { | |
1894 | goto end; | |
1895 | } | |
3bd1e081 | 1896 | /* poll on the array of fds */ |
88f2b785 | 1897 | restart: |
3bd1e081 MD |
1898 | DBG("polling on %d fd", nb_fd + 1); |
1899 | num_rdy = poll(pollfd, nb_fd + 1, consumer_poll_timeout); | |
1900 | DBG("poll num_rdy : %d", num_rdy); | |
1901 | if (num_rdy == -1) { | |
88f2b785 MD |
1902 | /* |
1903 | * Restart interrupted system call. | |
1904 | */ | |
1905 | if (errno == EINTR) { | |
1906 | goto restart; | |
1907 | } | |
3bd1e081 | 1908 | perror("Poll error"); |
f73fabfd | 1909 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
1910 | goto end; |
1911 | } else if (num_rdy == 0) { | |
1912 | DBG("Polling thread timed out"); | |
1913 | goto end; | |
1914 | } | |
1915 | ||
3bd1e081 | 1916 | /* |
00e2e675 DG |
1917 | * If the consumer_poll_pipe triggered poll go directly to the |
1918 | * beginning of the loop to update the array. We want to prioritize | |
1919 | * array update over low-priority reads. | |
3bd1e081 | 1920 | */ |
509bb1cf | 1921 | if (pollfd[nb_fd].revents & (POLLIN | POLLPRI)) { |
04fdd819 MD |
1922 | size_t pipe_readlen; |
1923 | char tmp; | |
1924 | ||
3bd1e081 | 1925 | DBG("consumer_poll_pipe wake up"); |
04fdd819 MD |
1926 | /* Consume 1 byte of pipe data */ |
1927 | do { | |
1928 | pipe_readlen = read(ctx->consumer_poll_pipe[0], &tmp, 1); | |
1929 | } while (pipe_readlen == -1 && errno == EINTR); | |
3bd1e081 MD |
1930 | continue; |
1931 | } | |
1932 | ||
1933 | /* Take care of high priority channels first. */ | |
1934 | for (i = 0; i < nb_fd; i++) { | |
fb3a43a9 | 1935 | if (pollfd[i].revents & POLLPRI) { |
d41f73b7 MD |
1936 | DBG("Urgent read on fd %d", pollfd[i].fd); |
1937 | high_prio = 1; | |
4078b776 | 1938 | len = ctx->on_buffer_ready(local_stream[i], ctx); |
d41f73b7 | 1939 | /* it's ok to have an unavailable sub-buffer */ |
4078b776 MD |
1940 | if (len < 0 && len != -EAGAIN) { |
1941 | goto end; | |
1942 | } else if (len > 0) { | |
1943 | local_stream[i]->data_read = 1; | |
d41f73b7 | 1944 | } |
3bd1e081 MD |
1945 | } |
1946 | } | |
1947 | ||
4078b776 MD |
1948 | /* |
1949 | * If we read high prio channel in this loop, try again | |
1950 | * for more high prio data. | |
1951 | */ | |
1952 | if (high_prio) { | |
3bd1e081 MD |
1953 | continue; |
1954 | } | |
1955 | ||
1956 | /* Take care of low priority channels. */ | |
4078b776 MD |
1957 | for (i = 0; i < nb_fd; i++) { |
1958 | if ((pollfd[i].revents & POLLIN) || | |
1959 | local_stream[i]->hangup_flush_done) { | |
4078b776 MD |
1960 | DBG("Normal read on fd %d", pollfd[i].fd); |
1961 | len = ctx->on_buffer_ready(local_stream[i], ctx); | |
1962 | /* it's ok to have an unavailable sub-buffer */ | |
1963 | if (len < 0 && len != -EAGAIN) { | |
1964 | goto end; | |
1965 | } else if (len > 0) { | |
1966 | local_stream[i]->data_read = 1; | |
1967 | } | |
1968 | } | |
1969 | } | |
1970 | ||
1971 | /* Handle hangup and errors */ | |
1972 | for (i = 0; i < nb_fd; i++) { | |
1973 | if (!local_stream[i]->hangup_flush_done | |
1974 | && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL)) | |
1975 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
1976 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
1977 | DBG("fd %d is hup|err|nval. Attempting flush and read.", | |
1978 | pollfd[i].fd); | |
1979 | lttng_ustconsumer_on_stream_hangup(local_stream[i]); | |
1980 | /* Attempt read again, for the data we just flushed. */ | |
1981 | local_stream[i]->data_read = 1; | |
1982 | } | |
1983 | /* | |
1984 | * If the poll flag is HUP/ERR/NVAL and we have | |
1985 | * read no data in this pass, we can remove the | |
1986 | * stream from its hash table. | |
1987 | */ | |
1988 | if ((pollfd[i].revents & POLLHUP)) { | |
1989 | DBG("Polling fd %d tells it has hung up.", pollfd[i].fd); | |
1990 | if (!local_stream[i]->data_read) { | |
702b1ea4 | 1991 | consumer_del_stream(local_stream[i]); |
4078b776 MD |
1992 | num_hup++; |
1993 | } | |
1994 | } else if (pollfd[i].revents & POLLERR) { | |
1995 | ERR("Error returned in polling fd %d.", pollfd[i].fd); | |
1996 | if (!local_stream[i]->data_read) { | |
702b1ea4 | 1997 | consumer_del_stream(local_stream[i]); |
4078b776 MD |
1998 | num_hup++; |
1999 | } | |
2000 | } else if (pollfd[i].revents & POLLNVAL) { | |
2001 | ERR("Polling fd %d tells fd is not open.", pollfd[i].fd); | |
2002 | if (!local_stream[i]->data_read) { | |
702b1ea4 | 2003 | consumer_del_stream(local_stream[i]); |
4078b776 | 2004 | num_hup++; |
3bd1e081 MD |
2005 | } |
2006 | } | |
4078b776 | 2007 | local_stream[i]->data_read = 0; |
3bd1e081 MD |
2008 | } |
2009 | } | |
2010 | end: | |
2011 | DBG("polling thread exiting"); | |
2012 | if (pollfd != NULL) { | |
2013 | free(pollfd); | |
2014 | pollfd = NULL; | |
2015 | } | |
2016 | if (local_stream != NULL) { | |
2017 | free(local_stream); | |
2018 | local_stream = NULL; | |
2019 | } | |
fb3a43a9 DG |
2020 | |
2021 | /* | |
2022 | * Close the write side of the pipe so epoll_wait() in | |
2023 | * lttng_consumer_thread_poll_metadata can catch it. The thread is | |
2024 | * monitoring the read side of the pipe. If we close them both, epoll_wait | |
2025 | * strangely does not return and could create a endless wait period if the | |
2026 | * pipe is the only tracked fd in the poll set. The thread will take care | |
2027 | * of closing the read side. | |
2028 | */ | |
2029 | close(ctx->consumer_metadata_pipe[1]); | |
2030 | if (ret) { | |
2031 | ret = pthread_join(metadata_thread, &status); | |
2032 | if (ret < 0) { | |
2033 | PERROR("pthread_join metadata thread"); | |
2034 | } | |
2035 | } | |
2036 | ||
e7b994a3 | 2037 | rcu_unregister_thread(); |
3bd1e081 MD |
2038 | return NULL; |
2039 | } | |
2040 | ||
2041 | /* | |
2042 | * This thread listens on the consumerd socket and receives the file | |
2043 | * descriptors from the session daemon. | |
2044 | */ | |
2045 | void *lttng_consumer_thread_receive_fds(void *data) | |
2046 | { | |
2047 | int sock, client_socket, ret; | |
2048 | /* | |
2049 | * structure to poll for incoming data on communication socket avoids | |
2050 | * making blocking sockets. | |
2051 | */ | |
2052 | struct pollfd consumer_sockpoll[2]; | |
2053 | struct lttng_consumer_local_data *ctx = data; | |
2054 | ||
e7b994a3 DG |
2055 | rcu_register_thread(); |
2056 | ||
3bd1e081 MD |
2057 | DBG("Creating command socket %s", ctx->consumer_command_sock_path); |
2058 | unlink(ctx->consumer_command_sock_path); | |
2059 | client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path); | |
2060 | if (client_socket < 0) { | |
2061 | ERR("Cannot create command socket"); | |
2062 | goto end; | |
2063 | } | |
2064 | ||
2065 | ret = lttcomm_listen_unix_sock(client_socket); | |
2066 | if (ret < 0) { | |
2067 | goto end; | |
2068 | } | |
2069 | ||
32258573 | 2070 | DBG("Sending ready command to lttng-sessiond"); |
f73fabfd | 2071 | ret = lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_COMMAND_SOCK_READY); |
3bd1e081 MD |
2072 | /* return < 0 on error, but == 0 is not fatal */ |
2073 | if (ret < 0) { | |
32258573 | 2074 | ERR("Error sending ready command to lttng-sessiond"); |
3bd1e081 MD |
2075 | goto end; |
2076 | } | |
2077 | ||
2078 | ret = fcntl(client_socket, F_SETFL, O_NONBLOCK); | |
2079 | if (ret < 0) { | |
2080 | perror("fcntl O_NONBLOCK"); | |
2081 | goto end; | |
2082 | } | |
2083 | ||
2084 | /* prepare the FDs to poll : to client socket and the should_quit pipe */ | |
2085 | consumer_sockpoll[0].fd = ctx->consumer_should_quit[0]; | |
2086 | consumer_sockpoll[0].events = POLLIN | POLLPRI; | |
2087 | consumer_sockpoll[1].fd = client_socket; | |
2088 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
2089 | ||
2090 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2091 | goto end; | |
2092 | } | |
2093 | DBG("Connection on client_socket"); | |
2094 | ||
2095 | /* Blocking call, waiting for transmission */ | |
2096 | sock = lttcomm_accept_unix_sock(client_socket); | |
2097 | if (sock <= 0) { | |
2098 | WARN("On accept"); | |
2099 | goto end; | |
2100 | } | |
2101 | ret = fcntl(sock, F_SETFL, O_NONBLOCK); | |
2102 | if (ret < 0) { | |
2103 | perror("fcntl O_NONBLOCK"); | |
2104 | goto end; | |
2105 | } | |
2106 | ||
2107 | /* update the polling structure to poll on the established socket */ | |
2108 | consumer_sockpoll[1].fd = sock; | |
2109 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
2110 | ||
2111 | while (1) { | |
2112 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2113 | goto end; | |
2114 | } | |
2115 | DBG("Incoming command on sock"); | |
2116 | ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
2117 | if (ret == -ENOENT) { | |
2118 | DBG("Received STOP command"); | |
2119 | goto end; | |
2120 | } | |
4cbc1a04 DG |
2121 | if (ret <= 0) { |
2122 | /* | |
2123 | * This could simply be a session daemon quitting. Don't output | |
2124 | * ERR() here. | |
2125 | */ | |
2126 | DBG("Communication interrupted on command socket"); | |
3bd1e081 MD |
2127 | goto end; |
2128 | } | |
2129 | if (consumer_quit) { | |
2130 | DBG("consumer_thread_receive_fds received quit from signal"); | |
2131 | goto end; | |
2132 | } | |
2133 | DBG("received fds on sock"); | |
2134 | } | |
2135 | end: | |
2136 | DBG("consumer_thread_receive_fds exiting"); | |
2137 | ||
2138 | /* | |
2139 | * when all fds have hung up, the polling thread | |
2140 | * can exit cleanly | |
2141 | */ | |
2142 | consumer_quit = 1; | |
2143 | ||
2144 | /* | |
2145 | * 2s of grace period, if no polling events occur during | |
2146 | * this period, the polling thread will exit even if there | |
2147 | * are still open FDs (should not happen, but safety mechanism). | |
2148 | */ | |
2149 | consumer_poll_timeout = LTTNG_CONSUMER_POLL_TIMEOUT; | |
2150 | ||
04fdd819 MD |
2151 | /* |
2152 | * Wake-up the other end by writing a null byte in the pipe | |
2153 | * (non-blocking). Important note: Because writing into the | |
2154 | * pipe is non-blocking (and therefore we allow dropping wakeup | |
2155 | * data, as long as there is wakeup data present in the pipe | |
2156 | * buffer to wake up the other end), the other end should | |
2157 | * perform the following sequence for waiting: | |
2158 | * 1) empty the pipe (reads). | |
2159 | * 2) perform update operation. | |
2160 | * 3) wait on the pipe (poll). | |
2161 | */ | |
2162 | do { | |
2163 | ret = write(ctx->consumer_poll_pipe[1], "", 1); | |
6f94560a | 2164 | } while (ret < 0 && errno == EINTR); |
e7b994a3 | 2165 | rcu_unregister_thread(); |
3bd1e081 MD |
2166 | return NULL; |
2167 | } | |
d41f73b7 | 2168 | |
4078b776 | 2169 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
2170 | struct lttng_consumer_local_data *ctx) |
2171 | { | |
2172 | switch (consumer_data.type) { | |
2173 | case LTTNG_CONSUMER_KERNEL: | |
2174 | return lttng_kconsumer_read_subbuffer(stream, ctx); | |
7753dea8 MD |
2175 | case LTTNG_CONSUMER32_UST: |
2176 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
2177 | return lttng_ustconsumer_read_subbuffer(stream, ctx); |
2178 | default: | |
2179 | ERR("Unknown consumer_data type"); | |
2180 | assert(0); | |
2181 | return -ENOSYS; | |
2182 | } | |
2183 | } | |
2184 | ||
2185 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
2186 | { | |
2187 | switch (consumer_data.type) { | |
2188 | case LTTNG_CONSUMER_KERNEL: | |
2189 | return lttng_kconsumer_on_recv_stream(stream); | |
7753dea8 MD |
2190 | case LTTNG_CONSUMER32_UST: |
2191 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
2192 | return lttng_ustconsumer_on_recv_stream(stream); |
2193 | default: | |
2194 | ERR("Unknown consumer_data type"); | |
2195 | assert(0); | |
2196 | return -ENOSYS; | |
2197 | } | |
2198 | } | |
e4421fec DG |
2199 | |
2200 | /* | |
2201 | * Allocate and set consumer data hash tables. | |
2202 | */ | |
2203 | void lttng_consumer_init(void) | |
2204 | { | |
2205 | consumer_data.stream_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
2206 | consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
00e2e675 | 2207 | consumer_data.relayd_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
e4421fec | 2208 | } |
7735ef9e DG |
2209 | |
2210 | /* | |
2211 | * Process the ADD_RELAYD command receive by a consumer. | |
2212 | * | |
2213 | * This will create a relayd socket pair and add it to the relayd hash table. | |
2214 | * The caller MUST acquire a RCU read side lock before calling it. | |
2215 | */ | |
2216 | int consumer_add_relayd_socket(int net_seq_idx, int sock_type, | |
2217 | struct lttng_consumer_local_data *ctx, int sock, | |
2218 | struct pollfd *consumer_sockpoll, struct lttcomm_sock *relayd_sock) | |
2219 | { | |
2220 | int fd, ret = -1; | |
2221 | struct consumer_relayd_sock_pair *relayd; | |
2222 | ||
2223 | DBG("Consumer adding relayd socket (idx: %d)", net_seq_idx); | |
2224 | ||
2225 | /* Get relayd reference if exists. */ | |
2226 | relayd = consumer_find_relayd(net_seq_idx); | |
2227 | if (relayd == NULL) { | |
2228 | /* Not found. Allocate one. */ | |
2229 | relayd = consumer_allocate_relayd_sock_pair(net_seq_idx); | |
2230 | if (relayd == NULL) { | |
f73fabfd | 2231 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
7735ef9e DG |
2232 | goto error; |
2233 | } | |
2234 | } | |
2235 | ||
2236 | /* Poll on consumer socket. */ | |
2237 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2238 | ret = -EINTR; | |
2239 | goto error; | |
2240 | } | |
2241 | ||
2242 | /* Get relayd socket from session daemon */ | |
2243 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); | |
2244 | if (ret != sizeof(fd)) { | |
f73fabfd | 2245 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
7735ef9e DG |
2246 | ret = -1; |
2247 | goto error; | |
2248 | } | |
2249 | ||
2250 | /* Copy socket information and received FD */ | |
2251 | switch (sock_type) { | |
2252 | case LTTNG_STREAM_CONTROL: | |
2253 | /* Copy received lttcomm socket */ | |
2254 | lttcomm_copy_sock(&relayd->control_sock, relayd_sock); | |
2255 | ret = lttcomm_create_sock(&relayd->control_sock); | |
2256 | if (ret < 0) { | |
2257 | goto error; | |
2258 | } | |
2259 | ||
2260 | /* Close the created socket fd which is useless */ | |
2261 | close(relayd->control_sock.fd); | |
2262 | ||
2263 | /* Assign new file descriptor */ | |
2264 | relayd->control_sock.fd = fd; | |
2265 | break; | |
2266 | case LTTNG_STREAM_DATA: | |
2267 | /* Copy received lttcomm socket */ | |
2268 | lttcomm_copy_sock(&relayd->data_sock, relayd_sock); | |
2269 | ret = lttcomm_create_sock(&relayd->data_sock); | |
2270 | if (ret < 0) { | |
2271 | goto error; | |
2272 | } | |
2273 | ||
2274 | /* Close the created socket fd which is useless */ | |
2275 | close(relayd->data_sock.fd); | |
2276 | ||
2277 | /* Assign new file descriptor */ | |
2278 | relayd->data_sock.fd = fd; | |
2279 | break; | |
2280 | default: | |
2281 | ERR("Unknown relayd socket type (%d)", sock_type); | |
2282 | goto error; | |
2283 | } | |
2284 | ||
2285 | DBG("Consumer %s socket created successfully with net idx %d (fd: %d)", | |
2286 | sock_type == LTTNG_STREAM_CONTROL ? "control" : "data", | |
2287 | relayd->net_seq_idx, fd); | |
2288 | ||
2289 | /* | |
2290 | * Add relayd socket pair to consumer data hashtable. If object already | |
2291 | * exists or on error, the function gracefully returns. | |
2292 | */ | |
2293 | consumer_add_relayd(relayd); | |
2294 | ||
2295 | /* All good! */ | |
2296 | ret = 0; | |
2297 | ||
2298 | error: | |
2299 | return ret; | |
2300 | } |