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> | |
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 | ||
3bd1e081 MD |
50 | /* |
51 | * Flag to inform the polling thread to quit when all fd hung up. Updated by | |
52 | * the consumer_thread_receive_fds when it notices that all fds has hung up. | |
53 | * Also updated by the signal handler (consumer_should_exit()). Read by the | |
54 | * polling threads. | |
55 | */ | |
a98dae5f | 56 | volatile int consumer_quit; |
3bd1e081 | 57 | |
43c34bc3 DG |
58 | /* |
59 | * The following two hash tables are visible by all threads which are separated | |
60 | * in different source files. | |
61 | * | |
62 | * Global hash table containing respectively metadata and data streams. The | |
63 | * stream element in this ht should only be updated by the metadata poll thread | |
64 | * for the metadata and the data poll thread for the data. | |
65 | */ | |
a98dae5f DG |
66 | struct lttng_ht *metadata_ht; |
67 | struct lttng_ht *data_ht; | |
43c34bc3 | 68 | |
8994307f DG |
69 | /* |
70 | * Notify a thread pipe to poll back again. This usually means that some global | |
71 | * state has changed so we just send back the thread in a poll wait call. | |
72 | */ | |
73 | static void notify_thread_pipe(int wpipe) | |
74 | { | |
75 | int ret; | |
76 | ||
77 | do { | |
78 | struct lttng_consumer_stream *null_stream = NULL; | |
79 | ||
80 | ret = write(wpipe, &null_stream, sizeof(null_stream)); | |
81 | } while (ret < 0 && errno == EINTR); | |
82 | } | |
83 | ||
3bd1e081 MD |
84 | /* |
85 | * Find a stream. The consumer_data.lock must be locked during this | |
86 | * call. | |
87 | */ | |
8389e4f8 DG |
88 | static struct lttng_consumer_stream *consumer_find_stream(int key, |
89 | struct lttng_ht *ht) | |
3bd1e081 | 90 | { |
e4421fec DG |
91 | struct lttng_ht_iter iter; |
92 | struct lttng_ht_node_ulong *node; | |
93 | struct lttng_consumer_stream *stream = NULL; | |
3bd1e081 | 94 | |
8389e4f8 DG |
95 | assert(ht); |
96 | ||
7ad0a0cb | 97 | /* Negative keys are lookup failures */ |
7a57cf92 | 98 | if (key < 0) { |
7ad0a0cb | 99 | return NULL; |
7a57cf92 | 100 | } |
e4421fec | 101 | |
6065ceec DG |
102 | rcu_read_lock(); |
103 | ||
8389e4f8 | 104 | lttng_ht_lookup(ht, (void *)((unsigned long) key), &iter); |
e4421fec DG |
105 | node = lttng_ht_iter_get_node_ulong(&iter); |
106 | if (node != NULL) { | |
107 | stream = caa_container_of(node, struct lttng_consumer_stream, node); | |
3bd1e081 | 108 | } |
e4421fec | 109 | |
6065ceec DG |
110 | rcu_read_unlock(); |
111 | ||
e4421fec | 112 | return stream; |
3bd1e081 MD |
113 | } |
114 | ||
c869f647 | 115 | void consumer_steal_stream_key(int key, struct lttng_ht *ht) |
7ad0a0cb MD |
116 | { |
117 | struct lttng_consumer_stream *stream; | |
118 | ||
04253271 | 119 | rcu_read_lock(); |
8389e4f8 | 120 | stream = consumer_find_stream(key, ht); |
04253271 | 121 | if (stream) { |
7ad0a0cb | 122 | stream->key = -1; |
04253271 MD |
123 | /* |
124 | * We don't want the lookup to match, but we still need | |
125 | * to iterate on this stream when iterating over the hash table. Just | |
126 | * change the node key. | |
127 | */ | |
128 | stream->node.key = -1; | |
129 | } | |
130 | rcu_read_unlock(); | |
7ad0a0cb MD |
131 | } |
132 | ||
3bd1e081 MD |
133 | static struct lttng_consumer_channel *consumer_find_channel(int key) |
134 | { | |
e4421fec DG |
135 | struct lttng_ht_iter iter; |
136 | struct lttng_ht_node_ulong *node; | |
137 | struct lttng_consumer_channel *channel = NULL; | |
3bd1e081 | 138 | |
7ad0a0cb | 139 | /* Negative keys are lookup failures */ |
7a57cf92 | 140 | if (key < 0) { |
7ad0a0cb | 141 | return NULL; |
7a57cf92 | 142 | } |
e4421fec | 143 | |
6065ceec DG |
144 | rcu_read_lock(); |
145 | ||
e4421fec DG |
146 | lttng_ht_lookup(consumer_data.channel_ht, (void *)((unsigned long) key), |
147 | &iter); | |
148 | node = lttng_ht_iter_get_node_ulong(&iter); | |
149 | if (node != NULL) { | |
150 | channel = caa_container_of(node, struct lttng_consumer_channel, node); | |
3bd1e081 | 151 | } |
e4421fec | 152 | |
6065ceec DG |
153 | rcu_read_unlock(); |
154 | ||
e4421fec | 155 | return channel; |
3bd1e081 MD |
156 | } |
157 | ||
7ad0a0cb MD |
158 | static void consumer_steal_channel_key(int key) |
159 | { | |
160 | struct lttng_consumer_channel *channel; | |
161 | ||
04253271 | 162 | rcu_read_lock(); |
7ad0a0cb | 163 | channel = consumer_find_channel(key); |
04253271 | 164 | if (channel) { |
7ad0a0cb | 165 | channel->key = -1; |
04253271 MD |
166 | /* |
167 | * We don't want the lookup to match, but we still need | |
168 | * to iterate on this channel when iterating over the hash table. Just | |
169 | * change the node key. | |
170 | */ | |
171 | channel->node.key = -1; | |
172 | } | |
173 | rcu_read_unlock(); | |
7ad0a0cb MD |
174 | } |
175 | ||
702b1ea4 MD |
176 | static |
177 | void consumer_free_stream(struct rcu_head *head) | |
178 | { | |
179 | struct lttng_ht_node_ulong *node = | |
180 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
181 | struct lttng_consumer_stream *stream = | |
182 | caa_container_of(node, struct lttng_consumer_stream, node); | |
183 | ||
184 | free(stream); | |
185 | } | |
186 | ||
00e2e675 DG |
187 | /* |
188 | * RCU protected relayd socket pair free. | |
189 | */ | |
190 | static void consumer_rcu_free_relayd(struct rcu_head *head) | |
191 | { | |
192 | struct lttng_ht_node_ulong *node = | |
193 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
194 | struct consumer_relayd_sock_pair *relayd = | |
195 | caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
196 | ||
8994307f DG |
197 | /* |
198 | * Close all sockets. This is done in the call RCU since we don't want the | |
199 | * socket fds to be reassigned thus potentially creating bad state of the | |
200 | * relayd object. | |
201 | * | |
202 | * We do not have to lock the control socket mutex here since at this stage | |
203 | * there is no one referencing to this relayd object. | |
204 | */ | |
205 | (void) relayd_close(&relayd->control_sock); | |
206 | (void) relayd_close(&relayd->data_sock); | |
207 | ||
00e2e675 DG |
208 | free(relayd); |
209 | } | |
210 | ||
211 | /* | |
212 | * Destroy and free relayd socket pair object. | |
213 | * | |
214 | * This function MUST be called with the consumer_data lock acquired. | |
215 | */ | |
d09e1200 | 216 | static void destroy_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
217 | { |
218 | int ret; | |
219 | struct lttng_ht_iter iter; | |
220 | ||
173af62f DG |
221 | if (relayd == NULL) { |
222 | return; | |
223 | } | |
224 | ||
00e2e675 DG |
225 | DBG("Consumer destroy and close relayd socket pair"); |
226 | ||
227 | iter.iter.node = &relayd->node.node; | |
228 | ret = lttng_ht_del(consumer_data.relayd_ht, &iter); | |
173af62f | 229 | if (ret != 0) { |
8994307f | 230 | /* We assume the relayd is being or is destroyed */ |
173af62f DG |
231 | return; |
232 | } | |
00e2e675 | 233 | |
00e2e675 DG |
234 | /* RCU free() call */ |
235 | call_rcu(&relayd->node.head, consumer_rcu_free_relayd); | |
236 | } | |
237 | ||
8994307f DG |
238 | /* |
239 | * Update the end point status of all streams having the given network sequence | |
240 | * index (relayd index). | |
241 | * | |
242 | * It's atomically set without having the stream mutex locked which is fine | |
243 | * because we handle the write/read race with a pipe wakeup for each thread. | |
244 | */ | |
245 | static void update_endpoint_status_by_netidx(int net_seq_idx, | |
246 | enum consumer_endpoint_status status) | |
247 | { | |
248 | struct lttng_ht_iter iter; | |
249 | struct lttng_consumer_stream *stream; | |
250 | ||
251 | DBG("Consumer set delete flag on stream by idx %d", net_seq_idx); | |
252 | ||
253 | rcu_read_lock(); | |
254 | ||
255 | /* Let's begin with metadata */ | |
256 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) { | |
257 | if (stream->net_seq_idx == net_seq_idx) { | |
258 | uatomic_set(&stream->endpoint_status, status); | |
259 | DBG("Delete flag set to metadata stream %d", stream->wait_fd); | |
260 | } | |
261 | } | |
262 | ||
263 | /* Follow up by the data streams */ | |
264 | cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) { | |
265 | if (stream->net_seq_idx == net_seq_idx) { | |
266 | uatomic_set(&stream->endpoint_status, status); | |
267 | DBG("Delete flag set to data stream %d", stream->wait_fd); | |
268 | } | |
269 | } | |
270 | rcu_read_unlock(); | |
271 | } | |
272 | ||
273 | /* | |
274 | * Cleanup a relayd object by flagging every associated streams for deletion, | |
275 | * destroying the object meaning removing it from the relayd hash table, | |
276 | * closing the sockets and freeing the memory in a RCU call. | |
277 | * | |
278 | * If a local data context is available, notify the threads that the streams' | |
279 | * state have changed. | |
280 | */ | |
281 | static void cleanup_relayd(struct consumer_relayd_sock_pair *relayd, | |
282 | struct lttng_consumer_local_data *ctx) | |
283 | { | |
284 | int netidx; | |
285 | ||
286 | assert(relayd); | |
287 | ||
9617607b DG |
288 | DBG("Cleaning up relayd sockets"); |
289 | ||
8994307f DG |
290 | /* Save the net sequence index before destroying the object */ |
291 | netidx = relayd->net_seq_idx; | |
292 | ||
293 | /* | |
294 | * Delete the relayd from the relayd hash table, close the sockets and free | |
295 | * the object in a RCU call. | |
296 | */ | |
297 | destroy_relayd(relayd); | |
298 | ||
299 | /* Set inactive endpoint to all streams */ | |
300 | update_endpoint_status_by_netidx(netidx, CONSUMER_ENDPOINT_INACTIVE); | |
301 | ||
302 | /* | |
303 | * With a local data context, notify the threads that the streams' state | |
304 | * have changed. The write() action on the pipe acts as an "implicit" | |
305 | * memory barrier ordering the updates of the end point status from the | |
306 | * read of this status which happens AFTER receiving this notify. | |
307 | */ | |
308 | if (ctx) { | |
309 | notify_thread_pipe(ctx->consumer_data_pipe[1]); | |
310 | notify_thread_pipe(ctx->consumer_metadata_pipe[1]); | |
311 | } | |
312 | } | |
313 | ||
a6ba4fe1 DG |
314 | /* |
315 | * Flag a relayd socket pair for destruction. Destroy it if the refcount | |
316 | * reaches zero. | |
317 | * | |
318 | * RCU read side lock MUST be aquired before calling this function. | |
319 | */ | |
320 | void consumer_flag_relayd_for_destroy(struct consumer_relayd_sock_pair *relayd) | |
321 | { | |
322 | assert(relayd); | |
323 | ||
324 | /* Set destroy flag for this object */ | |
325 | uatomic_set(&relayd->destroy_flag, 1); | |
326 | ||
327 | /* Destroy the relayd if refcount is 0 */ | |
328 | if (uatomic_read(&relayd->refcount) == 0) { | |
d09e1200 | 329 | destroy_relayd(relayd); |
a6ba4fe1 DG |
330 | } |
331 | } | |
332 | ||
3bd1e081 MD |
333 | /* |
334 | * Remove a stream from the global list protected by a mutex. This | |
335 | * function is also responsible for freeing its data structures. | |
336 | */ | |
e316aad5 DG |
337 | void consumer_del_stream(struct lttng_consumer_stream *stream, |
338 | struct lttng_ht *ht) | |
3bd1e081 MD |
339 | { |
340 | int ret; | |
e4421fec | 341 | struct lttng_ht_iter iter; |
3bd1e081 | 342 | struct lttng_consumer_channel *free_chan = NULL; |
00e2e675 DG |
343 | struct consumer_relayd_sock_pair *relayd; |
344 | ||
345 | assert(stream); | |
3bd1e081 | 346 | |
8994307f DG |
347 | DBG("Consumer del stream %d", stream->wait_fd); |
348 | ||
e316aad5 DG |
349 | if (ht == NULL) { |
350 | /* Means the stream was allocated but not successfully added */ | |
351 | goto free_stream; | |
352 | } | |
353 | ||
8994307f | 354 | pthread_mutex_lock(&stream->lock); |
3bd1e081 MD |
355 | pthread_mutex_lock(&consumer_data.lock); |
356 | ||
357 | switch (consumer_data.type) { | |
358 | case LTTNG_CONSUMER_KERNEL: | |
359 | if (stream->mmap_base != NULL) { | |
360 | ret = munmap(stream->mmap_base, stream->mmap_len); | |
361 | if (ret != 0) { | |
7a57cf92 | 362 | PERROR("munmap"); |
3bd1e081 MD |
363 | } |
364 | } | |
365 | break; | |
7753dea8 MD |
366 | case LTTNG_CONSUMER32_UST: |
367 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
368 | lttng_ustconsumer_del_stream(stream); |
369 | break; | |
370 | default: | |
371 | ERR("Unknown consumer_data type"); | |
372 | assert(0); | |
373 | goto end; | |
374 | } | |
375 | ||
6065ceec | 376 | rcu_read_lock(); |
04253271 | 377 | iter.iter.node = &stream->node.node; |
e316aad5 | 378 | ret = lttng_ht_del(ht, &iter); |
04253271 | 379 | assert(!ret); |
ca22feea DG |
380 | |
381 | /* Remove node session id from the consumer_data stream ht */ | |
382 | iter.iter.node = &stream->node_session_id.node; | |
383 | ret = lttng_ht_del(consumer_data.stream_list_ht, &iter); | |
384 | assert(!ret); | |
6065ceec DG |
385 | rcu_read_unlock(); |
386 | ||
50f8ae69 | 387 | assert(consumer_data.stream_count > 0); |
3bd1e081 | 388 | consumer_data.stream_count--; |
50f8ae69 | 389 | |
3bd1e081 | 390 | if (stream->out_fd >= 0) { |
4c462e79 MD |
391 | ret = close(stream->out_fd); |
392 | if (ret) { | |
393 | PERROR("close"); | |
394 | } | |
3bd1e081 | 395 | } |
b5c5fc29 | 396 | if (stream->wait_fd >= 0 && !stream->wait_fd_is_copy) { |
4c462e79 MD |
397 | ret = close(stream->wait_fd); |
398 | if (ret) { | |
399 | PERROR("close"); | |
400 | } | |
3bd1e081 | 401 | } |
2c1dd183 | 402 | if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) { |
4c462e79 MD |
403 | ret = close(stream->shm_fd); |
404 | if (ret) { | |
405 | PERROR("close"); | |
406 | } | |
3bd1e081 | 407 | } |
00e2e675 DG |
408 | |
409 | /* Check and cleanup relayd */ | |
b0b335c8 | 410 | rcu_read_lock(); |
00e2e675 DG |
411 | relayd = consumer_find_relayd(stream->net_seq_idx); |
412 | if (relayd != NULL) { | |
b0b335c8 MD |
413 | uatomic_dec(&relayd->refcount); |
414 | assert(uatomic_read(&relayd->refcount) >= 0); | |
173af62f | 415 | |
3f8e211f DG |
416 | /* Closing streams requires to lock the control socket. */ |
417 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
173af62f DG |
418 | ret = relayd_send_close_stream(&relayd->control_sock, |
419 | stream->relayd_stream_id, | |
420 | stream->next_net_seq_num - 1); | |
3f8e211f | 421 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); |
173af62f | 422 | if (ret < 0) { |
a4b92340 DG |
423 | DBG("Unable to close stream on the relayd. Continuing"); |
424 | /* | |
425 | * Continue here. There is nothing we can do for the relayd. | |
426 | * Chances are that the relayd has closed the socket so we just | |
427 | * continue cleaning up. | |
428 | */ | |
173af62f DG |
429 | } |
430 | ||
431 | /* Both conditions are met, we destroy the relayd. */ | |
432 | if (uatomic_read(&relayd->refcount) == 0 && | |
433 | uatomic_read(&relayd->destroy_flag)) { | |
d09e1200 | 434 | destroy_relayd(relayd); |
00e2e675 | 435 | } |
00e2e675 | 436 | } |
b0b335c8 | 437 | rcu_read_unlock(); |
00e2e675 | 438 | |
c30aaa51 MD |
439 | uatomic_dec(&stream->chan->refcount); |
440 | if (!uatomic_read(&stream->chan->refcount) | |
441 | && !uatomic_read(&stream->chan->nb_init_streams)) { | |
3bd1e081 | 442 | free_chan = stream->chan; |
00e2e675 DG |
443 | } |
444 | ||
3bd1e081 MD |
445 | end: |
446 | consumer_data.need_update = 1; | |
447 | pthread_mutex_unlock(&consumer_data.lock); | |
8994307f | 448 | pthread_mutex_unlock(&stream->lock); |
3bd1e081 | 449 | |
c30aaa51 | 450 | if (free_chan) { |
3bd1e081 | 451 | consumer_del_channel(free_chan); |
c30aaa51 | 452 | } |
e316aad5 DG |
453 | |
454 | free_stream: | |
455 | call_rcu(&stream->node.head, consumer_free_stream); | |
3bd1e081 MD |
456 | } |
457 | ||
458 | struct lttng_consumer_stream *consumer_allocate_stream( | |
459 | int channel_key, int stream_key, | |
460 | int shm_fd, int wait_fd, | |
461 | enum lttng_consumer_stream_state state, | |
462 | uint64_t mmap_len, | |
463 | enum lttng_event_output output, | |
6df2e2c9 MD |
464 | const char *path_name, |
465 | uid_t uid, | |
00e2e675 DG |
466 | gid_t gid, |
467 | int net_index, | |
c80048c6 | 468 | int metadata_flag, |
53632229 | 469 | uint64_t session_id, |
c80048c6 | 470 | int *alloc_ret) |
3bd1e081 MD |
471 | { |
472 | struct lttng_consumer_stream *stream; | |
3bd1e081 | 473 | |
effcf122 | 474 | stream = zmalloc(sizeof(*stream)); |
3bd1e081 | 475 | if (stream == NULL) { |
7a57cf92 | 476 | PERROR("malloc struct lttng_consumer_stream"); |
c80048c6 | 477 | *alloc_ret = -ENOMEM; |
7a57cf92 | 478 | goto end; |
3bd1e081 | 479 | } |
7a57cf92 DG |
480 | |
481 | /* | |
482 | * Get stream's channel reference. Needed when adding the stream to the | |
483 | * global hash table. | |
484 | */ | |
3bd1e081 MD |
485 | stream->chan = consumer_find_channel(channel_key); |
486 | if (!stream->chan) { | |
c80048c6 | 487 | *alloc_ret = -ENOENT; |
7a57cf92 | 488 | ERR("Unable to find channel for stream %d", stream_key); |
c80048c6 | 489 | goto error; |
3bd1e081 | 490 | } |
e316aad5 | 491 | |
3bd1e081 MD |
492 | stream->key = stream_key; |
493 | stream->shm_fd = shm_fd; | |
494 | stream->wait_fd = wait_fd; | |
495 | stream->out_fd = -1; | |
496 | stream->out_fd_offset = 0; | |
497 | stream->state = state; | |
498 | stream->mmap_len = mmap_len; | |
499 | stream->mmap_base = NULL; | |
500 | stream->output = output; | |
6df2e2c9 MD |
501 | stream->uid = uid; |
502 | stream->gid = gid; | |
00e2e675 DG |
503 | stream->net_seq_idx = net_index; |
504 | stream->metadata_flag = metadata_flag; | |
53632229 | 505 | stream->session_id = session_id; |
00e2e675 DG |
506 | strncpy(stream->path_name, path_name, sizeof(stream->path_name)); |
507 | stream->path_name[sizeof(stream->path_name) - 1] = '\0'; | |
53632229 | 508 | pthread_mutex_init(&stream->lock, NULL); |
58b1f425 DG |
509 | |
510 | /* | |
511 | * Index differently the metadata node because the thread is using an | |
512 | * internal hash table to match streams in the metadata_ht to the epoll set | |
513 | * file descriptor. | |
514 | */ | |
515 | if (metadata_flag) { | |
516 | lttng_ht_node_init_ulong(&stream->node, stream->wait_fd); | |
517 | } else { | |
518 | lttng_ht_node_init_ulong(&stream->node, stream->key); | |
519 | } | |
c30aaa51 | 520 | |
53632229 DG |
521 | /* Init session id node with the stream session id */ |
522 | lttng_ht_node_init_ulong(&stream->node_session_id, stream->session_id); | |
523 | ||
c869f647 DG |
524 | /* |
525 | * The cpu number is needed before using any ustctl_* actions. Ignored for | |
526 | * the kernel so the value does not matter. | |
527 | */ | |
528 | pthread_mutex_lock(&consumer_data.lock); | |
529 | stream->cpu = stream->chan->cpucount++; | |
530 | pthread_mutex_unlock(&consumer_data.lock); | |
531 | ||
c30aaa51 | 532 | DBG3("Allocated stream %s (key %d, shm_fd %d, wait_fd %d, mmap_len %llu," |
53632229 DG |
533 | " out_fd %d, net_seq_idx %d, session_id %" PRIu64, |
534 | stream->path_name, stream->key, stream->shm_fd, stream->wait_fd, | |
c30aaa51 | 535 | (unsigned long long) stream->mmap_len, stream->out_fd, |
53632229 | 536 | stream->net_seq_idx, stream->session_id); |
3bd1e081 | 537 | return stream; |
c80048c6 MD |
538 | |
539 | error: | |
540 | free(stream); | |
7a57cf92 | 541 | end: |
c80048c6 | 542 | return NULL; |
3bd1e081 MD |
543 | } |
544 | ||
545 | /* | |
546 | * Add a stream to the global list protected by a mutex. | |
547 | */ | |
43c34bc3 DG |
548 | static int consumer_add_stream(struct lttng_consumer_stream *stream, |
549 | struct lttng_ht *ht) | |
3bd1e081 MD |
550 | { |
551 | int ret = 0; | |
00e2e675 | 552 | struct consumer_relayd_sock_pair *relayd; |
3bd1e081 | 553 | |
e316aad5 | 554 | assert(stream); |
43c34bc3 | 555 | assert(ht); |
c77fc10a | 556 | |
e316aad5 DG |
557 | DBG3("Adding consumer stream %d", stream->key); |
558 | ||
559 | pthread_mutex_lock(&consumer_data.lock); | |
b0b335c8 | 560 | rcu_read_lock(); |
e316aad5 | 561 | |
43c34bc3 DG |
562 | /* Steal stream identifier to avoid having streams with the same key */ |
563 | consumer_steal_stream_key(stream->key, ht); | |
564 | ||
565 | lttng_ht_add_unique_ulong(ht, &stream->node); | |
00e2e675 | 566 | |
ca22feea DG |
567 | /* |
568 | * Add stream to the stream_list_ht of the consumer data. No need to steal | |
569 | * the key since the HT does not use it and we allow to add redundant keys | |
570 | * into this table. | |
571 | */ | |
572 | lttng_ht_add_ulong(consumer_data.stream_list_ht, &stream->node_session_id); | |
573 | ||
00e2e675 DG |
574 | /* Check and cleanup relayd */ |
575 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
576 | if (relayd != NULL) { | |
b0b335c8 | 577 | uatomic_inc(&relayd->refcount); |
00e2e675 DG |
578 | } |
579 | ||
e316aad5 DG |
580 | /* Update channel refcount once added without error(s). */ |
581 | uatomic_inc(&stream->chan->refcount); | |
582 | ||
583 | /* | |
584 | * When nb_init_streams reaches 0, we don't need to trigger any action in | |
585 | * terms of destroying the associated channel, because the action that | |
586 | * causes the count to become 0 also causes a stream to be added. The | |
587 | * channel deletion will thus be triggered by the following removal of this | |
588 | * stream. | |
589 | */ | |
590 | if (uatomic_read(&stream->chan->nb_init_streams) > 0) { | |
591 | uatomic_dec(&stream->chan->nb_init_streams); | |
592 | } | |
593 | ||
594 | /* Update consumer data once the node is inserted. */ | |
3bd1e081 MD |
595 | consumer_data.stream_count++; |
596 | consumer_data.need_update = 1; | |
597 | ||
e316aad5 | 598 | rcu_read_unlock(); |
3bd1e081 | 599 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 600 | |
3bd1e081 MD |
601 | return ret; |
602 | } | |
603 | ||
00e2e675 | 604 | /* |
3f8e211f DG |
605 | * Add relayd socket to global consumer data hashtable. RCU read side lock MUST |
606 | * be acquired before calling this. | |
00e2e675 | 607 | */ |
d09e1200 | 608 | static int add_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
609 | { |
610 | int ret = 0; | |
611 | struct lttng_ht_node_ulong *node; | |
612 | struct lttng_ht_iter iter; | |
613 | ||
614 | if (relayd == NULL) { | |
615 | ret = -1; | |
616 | goto end; | |
617 | } | |
618 | ||
00e2e675 DG |
619 | lttng_ht_lookup(consumer_data.relayd_ht, |
620 | (void *)((unsigned long) relayd->net_seq_idx), &iter); | |
621 | node = lttng_ht_iter_get_node_ulong(&iter); | |
622 | if (node != NULL) { | |
00e2e675 DG |
623 | /* Relayd already exist. Ignore the insertion */ |
624 | goto end; | |
625 | } | |
626 | lttng_ht_add_unique_ulong(consumer_data.relayd_ht, &relayd->node); | |
627 | ||
00e2e675 DG |
628 | end: |
629 | return ret; | |
630 | } | |
631 | ||
632 | /* | |
633 | * Allocate and return a consumer relayd socket. | |
634 | */ | |
635 | struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair( | |
636 | int net_seq_idx) | |
637 | { | |
638 | struct consumer_relayd_sock_pair *obj = NULL; | |
639 | ||
640 | /* Negative net sequence index is a failure */ | |
641 | if (net_seq_idx < 0) { | |
642 | goto error; | |
643 | } | |
644 | ||
645 | obj = zmalloc(sizeof(struct consumer_relayd_sock_pair)); | |
646 | if (obj == NULL) { | |
647 | PERROR("zmalloc relayd sock"); | |
648 | goto error; | |
649 | } | |
650 | ||
651 | obj->net_seq_idx = net_seq_idx; | |
652 | obj->refcount = 0; | |
173af62f | 653 | obj->destroy_flag = 0; |
00e2e675 DG |
654 | lttng_ht_node_init_ulong(&obj->node, obj->net_seq_idx); |
655 | pthread_mutex_init(&obj->ctrl_sock_mutex, NULL); | |
656 | ||
657 | error: | |
658 | return obj; | |
659 | } | |
660 | ||
661 | /* | |
662 | * Find a relayd socket pair in the global consumer data. | |
663 | * | |
664 | * Return the object if found else NULL. | |
b0b335c8 MD |
665 | * RCU read-side lock must be held across this call and while using the |
666 | * returned object. | |
00e2e675 DG |
667 | */ |
668 | struct consumer_relayd_sock_pair *consumer_find_relayd(int key) | |
669 | { | |
670 | struct lttng_ht_iter iter; | |
671 | struct lttng_ht_node_ulong *node; | |
672 | struct consumer_relayd_sock_pair *relayd = NULL; | |
673 | ||
674 | /* Negative keys are lookup failures */ | |
675 | if (key < 0) { | |
676 | goto error; | |
677 | } | |
678 | ||
00e2e675 DG |
679 | lttng_ht_lookup(consumer_data.relayd_ht, (void *)((unsigned long) key), |
680 | &iter); | |
681 | node = lttng_ht_iter_get_node_ulong(&iter); | |
682 | if (node != NULL) { | |
683 | relayd = caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
684 | } | |
685 | ||
00e2e675 DG |
686 | error: |
687 | return relayd; | |
688 | } | |
689 | ||
690 | /* | |
691 | * Handle stream for relayd transmission if the stream applies for network | |
692 | * streaming where the net sequence index is set. | |
693 | * | |
694 | * Return destination file descriptor or negative value on error. | |
695 | */ | |
6197aea7 | 696 | static int write_relayd_stream_header(struct lttng_consumer_stream *stream, |
1d4dfdef DG |
697 | size_t data_size, unsigned long padding, |
698 | struct consumer_relayd_sock_pair *relayd) | |
00e2e675 DG |
699 | { |
700 | int outfd = -1, ret; | |
00e2e675 DG |
701 | struct lttcomm_relayd_data_hdr data_hdr; |
702 | ||
703 | /* Safety net */ | |
704 | assert(stream); | |
6197aea7 | 705 | assert(relayd); |
00e2e675 DG |
706 | |
707 | /* Reset data header */ | |
708 | memset(&data_hdr, 0, sizeof(data_hdr)); | |
709 | ||
00e2e675 DG |
710 | if (stream->metadata_flag) { |
711 | /* Caller MUST acquire the relayd control socket lock */ | |
712 | ret = relayd_send_metadata(&relayd->control_sock, data_size); | |
713 | if (ret < 0) { | |
714 | goto error; | |
715 | } | |
716 | ||
717 | /* Metadata are always sent on the control socket. */ | |
718 | outfd = relayd->control_sock.fd; | |
719 | } else { | |
720 | /* Set header with stream information */ | |
721 | data_hdr.stream_id = htobe64(stream->relayd_stream_id); | |
722 | data_hdr.data_size = htobe32(data_size); | |
1d4dfdef | 723 | data_hdr.padding_size = htobe32(padding); |
173af62f | 724 | data_hdr.net_seq_num = htobe64(stream->next_net_seq_num++); |
00e2e675 DG |
725 | /* Other fields are zeroed previously */ |
726 | ||
727 | ret = relayd_send_data_hdr(&relayd->data_sock, &data_hdr, | |
728 | sizeof(data_hdr)); | |
729 | if (ret < 0) { | |
730 | goto error; | |
731 | } | |
732 | ||
733 | /* Set to go on data socket */ | |
734 | outfd = relayd->data_sock.fd; | |
735 | } | |
736 | ||
737 | error: | |
738 | return outfd; | |
739 | } | |
740 | ||
702b1ea4 MD |
741 | static |
742 | void consumer_free_channel(struct rcu_head *head) | |
743 | { | |
744 | struct lttng_ht_node_ulong *node = | |
745 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
746 | struct lttng_consumer_channel *channel = | |
747 | caa_container_of(node, struct lttng_consumer_channel, node); | |
748 | ||
749 | free(channel); | |
750 | } | |
751 | ||
3bd1e081 MD |
752 | /* |
753 | * Remove a channel from the global list protected by a mutex. This | |
754 | * function is also responsible for freeing its data structures. | |
755 | */ | |
756 | void consumer_del_channel(struct lttng_consumer_channel *channel) | |
757 | { | |
758 | int ret; | |
e4421fec | 759 | struct lttng_ht_iter iter; |
3bd1e081 MD |
760 | |
761 | pthread_mutex_lock(&consumer_data.lock); | |
762 | ||
763 | switch (consumer_data.type) { | |
764 | case LTTNG_CONSUMER_KERNEL: | |
765 | break; | |
7753dea8 MD |
766 | case LTTNG_CONSUMER32_UST: |
767 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
768 | lttng_ustconsumer_del_channel(channel); |
769 | break; | |
770 | default: | |
771 | ERR("Unknown consumer_data type"); | |
772 | assert(0); | |
773 | goto end; | |
774 | } | |
775 | ||
6065ceec | 776 | rcu_read_lock(); |
04253271 MD |
777 | iter.iter.node = &channel->node.node; |
778 | ret = lttng_ht_del(consumer_data.channel_ht, &iter); | |
779 | assert(!ret); | |
6065ceec DG |
780 | rcu_read_unlock(); |
781 | ||
3bd1e081 MD |
782 | if (channel->mmap_base != NULL) { |
783 | ret = munmap(channel->mmap_base, channel->mmap_len); | |
784 | if (ret != 0) { | |
7a57cf92 | 785 | PERROR("munmap"); |
3bd1e081 MD |
786 | } |
787 | } | |
b5c5fc29 | 788 | if (channel->wait_fd >= 0 && !channel->wait_fd_is_copy) { |
4c462e79 MD |
789 | ret = close(channel->wait_fd); |
790 | if (ret) { | |
791 | PERROR("close"); | |
792 | } | |
3bd1e081 | 793 | } |
2c1dd183 | 794 | if (channel->shm_fd >= 0 && channel->wait_fd != channel->shm_fd) { |
4c462e79 MD |
795 | ret = close(channel->shm_fd); |
796 | if (ret) { | |
797 | PERROR("close"); | |
798 | } | |
3bd1e081 | 799 | } |
702b1ea4 MD |
800 | |
801 | call_rcu(&channel->node.head, consumer_free_channel); | |
3bd1e081 MD |
802 | end: |
803 | pthread_mutex_unlock(&consumer_data.lock); | |
804 | } | |
805 | ||
806 | struct lttng_consumer_channel *consumer_allocate_channel( | |
807 | int channel_key, | |
808 | int shm_fd, int wait_fd, | |
809 | uint64_t mmap_len, | |
c30aaa51 MD |
810 | uint64_t max_sb_size, |
811 | unsigned int nb_init_streams) | |
3bd1e081 MD |
812 | { |
813 | struct lttng_consumer_channel *channel; | |
814 | int ret; | |
815 | ||
276b26d1 | 816 | channel = zmalloc(sizeof(*channel)); |
3bd1e081 | 817 | if (channel == NULL) { |
7a57cf92 | 818 | PERROR("malloc struct lttng_consumer_channel"); |
3bd1e081 MD |
819 | goto end; |
820 | } | |
821 | channel->key = channel_key; | |
822 | channel->shm_fd = shm_fd; | |
823 | channel->wait_fd = wait_fd; | |
824 | channel->mmap_len = mmap_len; | |
825 | channel->max_sb_size = max_sb_size; | |
826 | channel->refcount = 0; | |
c30aaa51 | 827 | channel->nb_init_streams = nb_init_streams; |
e4421fec | 828 | lttng_ht_node_init_ulong(&channel->node, channel->key); |
3bd1e081 MD |
829 | |
830 | switch (consumer_data.type) { | |
831 | case LTTNG_CONSUMER_KERNEL: | |
832 | channel->mmap_base = NULL; | |
833 | channel->mmap_len = 0; | |
834 | break; | |
7753dea8 MD |
835 | case LTTNG_CONSUMER32_UST: |
836 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
837 | ret = lttng_ustconsumer_allocate_channel(channel); |
838 | if (ret) { | |
839 | free(channel); | |
840 | return NULL; | |
841 | } | |
842 | break; | |
843 | default: | |
844 | ERR("Unknown consumer_data type"); | |
845 | assert(0); | |
846 | goto end; | |
847 | } | |
848 | DBG("Allocated channel (key %d, shm_fd %d, wait_fd %d, mmap_len %llu, max_sb_size %llu)", | |
00e2e675 | 849 | channel->key, channel->shm_fd, channel->wait_fd, |
3bd1e081 MD |
850 | (unsigned long long) channel->mmap_len, |
851 | (unsigned long long) channel->max_sb_size); | |
852 | end: | |
853 | return channel; | |
854 | } | |
855 | ||
856 | /* | |
857 | * Add a channel to the global list protected by a mutex. | |
858 | */ | |
859 | int consumer_add_channel(struct lttng_consumer_channel *channel) | |
860 | { | |
c77fc10a DG |
861 | struct lttng_ht_node_ulong *node; |
862 | struct lttng_ht_iter iter; | |
863 | ||
3bd1e081 | 864 | pthread_mutex_lock(&consumer_data.lock); |
7ad0a0cb MD |
865 | /* Steal channel identifier, for UST */ |
866 | consumer_steal_channel_key(channel->key); | |
6065ceec | 867 | rcu_read_lock(); |
c77fc10a DG |
868 | |
869 | lttng_ht_lookup(consumer_data.channel_ht, | |
870 | (void *)((unsigned long) channel->key), &iter); | |
871 | node = lttng_ht_iter_get_node_ulong(&iter); | |
872 | if (node != NULL) { | |
873 | /* Channel already exist. Ignore the insertion */ | |
874 | goto end; | |
875 | } | |
876 | ||
04253271 | 877 | lttng_ht_add_unique_ulong(consumer_data.channel_ht, &channel->node); |
c77fc10a DG |
878 | |
879 | end: | |
6065ceec | 880 | rcu_read_unlock(); |
3bd1e081 | 881 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 882 | |
7ad0a0cb | 883 | return 0; |
3bd1e081 MD |
884 | } |
885 | ||
886 | /* | |
887 | * Allocate the pollfd structure and the local view of the out fds to avoid | |
888 | * doing a lookup in the linked list and concurrency issues when writing is | |
889 | * needed. Called with consumer_data.lock held. | |
890 | * | |
891 | * Returns the number of fds in the structures. | |
892 | */ | |
43c34bc3 | 893 | static int consumer_update_poll_array( |
3bd1e081 | 894 | struct lttng_consumer_local_data *ctx, struct pollfd **pollfd, |
43c34bc3 | 895 | struct lttng_consumer_stream **local_stream, struct lttng_ht *ht) |
3bd1e081 | 896 | { |
3bd1e081 | 897 | int i = 0; |
e4421fec DG |
898 | struct lttng_ht_iter iter; |
899 | struct lttng_consumer_stream *stream; | |
3bd1e081 MD |
900 | |
901 | DBG("Updating poll fd array"); | |
481d6c57 | 902 | rcu_read_lock(); |
43c34bc3 | 903 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { |
8994307f DG |
904 | /* |
905 | * Only active streams with an active end point can be added to the | |
906 | * poll set and local stream storage of the thread. | |
907 | * | |
908 | * There is a potential race here for endpoint_status to be updated | |
909 | * just after the check. However, this is OK since the stream(s) will | |
910 | * be deleted once the thread is notified that the end point state has | |
911 | * changed where this function will be called back again. | |
912 | */ | |
913 | if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM || | |
914 | stream->endpoint_status) { | |
3bd1e081 MD |
915 | continue; |
916 | } | |
e4421fec DG |
917 | DBG("Active FD %d", stream->wait_fd); |
918 | (*pollfd)[i].fd = stream->wait_fd; | |
3bd1e081 | 919 | (*pollfd)[i].events = POLLIN | POLLPRI; |
e4421fec | 920 | local_stream[i] = stream; |
3bd1e081 MD |
921 | i++; |
922 | } | |
481d6c57 | 923 | rcu_read_unlock(); |
3bd1e081 MD |
924 | |
925 | /* | |
50f8ae69 | 926 | * Insert the consumer_data_pipe at the end of the array and don't |
3bd1e081 MD |
927 | * increment i so nb_fd is the number of real FD. |
928 | */ | |
50f8ae69 | 929 | (*pollfd)[i].fd = ctx->consumer_data_pipe[0]; |
509bb1cf | 930 | (*pollfd)[i].events = POLLIN | POLLPRI; |
3bd1e081 MD |
931 | return i; |
932 | } | |
933 | ||
934 | /* | |
935 | * Poll on the should_quit pipe and the command socket return -1 on error and | |
936 | * should exit, 0 if data is available on the command socket | |
937 | */ | |
938 | int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll) | |
939 | { | |
940 | int num_rdy; | |
941 | ||
88f2b785 | 942 | restart: |
3bd1e081 MD |
943 | num_rdy = poll(consumer_sockpoll, 2, -1); |
944 | if (num_rdy == -1) { | |
88f2b785 MD |
945 | /* |
946 | * Restart interrupted system call. | |
947 | */ | |
948 | if (errno == EINTR) { | |
949 | goto restart; | |
950 | } | |
7a57cf92 | 951 | PERROR("Poll error"); |
3bd1e081 MD |
952 | goto exit; |
953 | } | |
509bb1cf | 954 | if (consumer_sockpoll[0].revents & (POLLIN | POLLPRI)) { |
3bd1e081 MD |
955 | DBG("consumer_should_quit wake up"); |
956 | goto exit; | |
957 | } | |
958 | return 0; | |
959 | ||
960 | exit: | |
961 | return -1; | |
962 | } | |
963 | ||
964 | /* | |
965 | * Set the error socket. | |
966 | */ | |
967 | void lttng_consumer_set_error_sock( | |
968 | struct lttng_consumer_local_data *ctx, int sock) | |
969 | { | |
970 | ctx->consumer_error_socket = sock; | |
971 | } | |
972 | ||
973 | /* | |
974 | * Set the command socket path. | |
975 | */ | |
3bd1e081 MD |
976 | void lttng_consumer_set_command_sock_path( |
977 | struct lttng_consumer_local_data *ctx, char *sock) | |
978 | { | |
979 | ctx->consumer_command_sock_path = sock; | |
980 | } | |
981 | ||
982 | /* | |
983 | * Send return code to the session daemon. | |
984 | * If the socket is not defined, we return 0, it is not a fatal error | |
985 | */ | |
986 | int lttng_consumer_send_error( | |
987 | struct lttng_consumer_local_data *ctx, int cmd) | |
988 | { | |
989 | if (ctx->consumer_error_socket > 0) { | |
990 | return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd, | |
991 | sizeof(enum lttcomm_sessiond_command)); | |
992 | } | |
993 | ||
994 | return 0; | |
995 | } | |
996 | ||
997 | /* | |
998 | * Close all the tracefiles and stream fds, should be called when all instances | |
999 | * are destroyed. | |
1000 | */ | |
1001 | void lttng_consumer_cleanup(void) | |
1002 | { | |
e4421fec | 1003 | struct lttng_ht_iter iter; |
6065ceec DG |
1004 | struct lttng_ht_node_ulong *node; |
1005 | ||
1006 | rcu_read_lock(); | |
3bd1e081 | 1007 | |
6065ceec DG |
1008 | cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, node, |
1009 | node) { | |
702b1ea4 MD |
1010 | struct lttng_consumer_channel *channel = |
1011 | caa_container_of(node, struct lttng_consumer_channel, node); | |
1012 | consumer_del_channel(channel); | |
3bd1e081 | 1013 | } |
6065ceec DG |
1014 | |
1015 | rcu_read_unlock(); | |
d6ce1df2 | 1016 | |
d6ce1df2 | 1017 | lttng_ht_destroy(consumer_data.channel_ht); |
3bd1e081 MD |
1018 | } |
1019 | ||
1020 | /* | |
1021 | * Called from signal handler. | |
1022 | */ | |
1023 | void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx) | |
1024 | { | |
1025 | int ret; | |
1026 | consumer_quit = 1; | |
6f94560a MD |
1027 | do { |
1028 | ret = write(ctx->consumer_should_quit[1], "4", 1); | |
1029 | } while (ret < 0 && errno == EINTR); | |
3bd1e081 | 1030 | if (ret < 0) { |
7a57cf92 | 1031 | PERROR("write consumer quit"); |
3bd1e081 | 1032 | } |
ab1027f4 DG |
1033 | |
1034 | DBG("Consumer flag that it should quit"); | |
3bd1e081 MD |
1035 | } |
1036 | ||
00e2e675 DG |
1037 | void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream, |
1038 | off_t orig_offset) | |
3bd1e081 MD |
1039 | { |
1040 | int outfd = stream->out_fd; | |
1041 | ||
1042 | /* | |
1043 | * This does a blocking write-and-wait on any page that belongs to the | |
1044 | * subbuffer prior to the one we just wrote. | |
1045 | * Don't care about error values, as these are just hints and ways to | |
1046 | * limit the amount of page cache used. | |
1047 | */ | |
1048 | if (orig_offset < stream->chan->max_sb_size) { | |
1049 | return; | |
1050 | } | |
b9182dd9 | 1051 | lttng_sync_file_range(outfd, orig_offset - stream->chan->max_sb_size, |
3bd1e081 MD |
1052 | stream->chan->max_sb_size, |
1053 | SYNC_FILE_RANGE_WAIT_BEFORE | |
1054 | | SYNC_FILE_RANGE_WRITE | |
1055 | | SYNC_FILE_RANGE_WAIT_AFTER); | |
1056 | /* | |
1057 | * Give hints to the kernel about how we access the file: | |
1058 | * POSIX_FADV_DONTNEED : we won't re-access data in a near future after | |
1059 | * we write it. | |
1060 | * | |
1061 | * We need to call fadvise again after the file grows because the | |
1062 | * kernel does not seem to apply fadvise to non-existing parts of the | |
1063 | * file. | |
1064 | * | |
1065 | * Call fadvise _after_ having waited for the page writeback to | |
1066 | * complete because the dirty page writeback semantic is not well | |
1067 | * defined. So it can be expected to lead to lower throughput in | |
1068 | * streaming. | |
1069 | */ | |
1070 | posix_fadvise(outfd, orig_offset - stream->chan->max_sb_size, | |
1071 | stream->chan->max_sb_size, POSIX_FADV_DONTNEED); | |
1072 | } | |
1073 | ||
1074 | /* | |
1075 | * Initialise the necessary environnement : | |
1076 | * - create a new context | |
1077 | * - create the poll_pipe | |
1078 | * - create the should_quit pipe (for signal handler) | |
1079 | * - create the thread pipe (for splice) | |
1080 | * | |
1081 | * Takes a function pointer as argument, this function is called when data is | |
1082 | * available on a buffer. This function is responsible to do the | |
1083 | * kernctl_get_next_subbuf, read the data with mmap or splice depending on the | |
1084 | * buffer configuration and then kernctl_put_next_subbuf at the end. | |
1085 | * | |
1086 | * Returns a pointer to the new context or NULL on error. | |
1087 | */ | |
1088 | struct lttng_consumer_local_data *lttng_consumer_create( | |
1089 | enum lttng_consumer_type type, | |
4078b776 | 1090 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
d41f73b7 | 1091 | struct lttng_consumer_local_data *ctx), |
3bd1e081 MD |
1092 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
1093 | int (*recv_stream)(struct lttng_consumer_stream *stream), | |
1094 | int (*update_stream)(int stream_key, uint32_t state)) | |
1095 | { | |
1096 | int ret, i; | |
1097 | struct lttng_consumer_local_data *ctx; | |
1098 | ||
1099 | assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN || | |
1100 | consumer_data.type == type); | |
1101 | consumer_data.type = type; | |
1102 | ||
effcf122 | 1103 | ctx = zmalloc(sizeof(struct lttng_consumer_local_data)); |
3bd1e081 | 1104 | if (ctx == NULL) { |
7a57cf92 | 1105 | PERROR("allocating context"); |
3bd1e081 MD |
1106 | goto error; |
1107 | } | |
1108 | ||
1109 | ctx->consumer_error_socket = -1; | |
1110 | /* assign the callbacks */ | |
1111 | ctx->on_buffer_ready = buffer_ready; | |
1112 | ctx->on_recv_channel = recv_channel; | |
1113 | ctx->on_recv_stream = recv_stream; | |
1114 | ctx->on_update_stream = update_stream; | |
1115 | ||
50f8ae69 | 1116 | ret = pipe(ctx->consumer_data_pipe); |
3bd1e081 | 1117 | if (ret < 0) { |
7a57cf92 | 1118 | PERROR("Error creating poll pipe"); |
3bd1e081 MD |
1119 | goto error_poll_pipe; |
1120 | } | |
1121 | ||
04fdd819 | 1122 | /* set read end of the pipe to non-blocking */ |
50f8ae69 | 1123 | ret = fcntl(ctx->consumer_data_pipe[0], F_SETFL, O_NONBLOCK); |
04fdd819 | 1124 | if (ret < 0) { |
7a57cf92 | 1125 | PERROR("fcntl O_NONBLOCK"); |
04fdd819 MD |
1126 | goto error_poll_fcntl; |
1127 | } | |
1128 | ||
1129 | /* set write end of the pipe to non-blocking */ | |
50f8ae69 | 1130 | ret = fcntl(ctx->consumer_data_pipe[1], F_SETFL, O_NONBLOCK); |
04fdd819 | 1131 | if (ret < 0) { |
7a57cf92 | 1132 | PERROR("fcntl O_NONBLOCK"); |
04fdd819 MD |
1133 | goto error_poll_fcntl; |
1134 | } | |
1135 | ||
3bd1e081 MD |
1136 | ret = pipe(ctx->consumer_should_quit); |
1137 | if (ret < 0) { | |
7a57cf92 | 1138 | PERROR("Error creating recv pipe"); |
3bd1e081 MD |
1139 | goto error_quit_pipe; |
1140 | } | |
1141 | ||
1142 | ret = pipe(ctx->consumer_thread_pipe); | |
1143 | if (ret < 0) { | |
7a57cf92 | 1144 | PERROR("Error creating thread pipe"); |
3bd1e081 MD |
1145 | goto error_thread_pipe; |
1146 | } | |
1147 | ||
fb3a43a9 DG |
1148 | ret = utils_create_pipe(ctx->consumer_metadata_pipe); |
1149 | if (ret < 0) { | |
1150 | goto error_metadata_pipe; | |
1151 | } | |
3bd1e081 | 1152 | |
fb3a43a9 DG |
1153 | ret = utils_create_pipe(ctx->consumer_splice_metadata_pipe); |
1154 | if (ret < 0) { | |
1155 | goto error_splice_pipe; | |
1156 | } | |
1157 | ||
1158 | return ctx; | |
3bd1e081 | 1159 | |
fb3a43a9 DG |
1160 | error_splice_pipe: |
1161 | utils_close_pipe(ctx->consumer_metadata_pipe); | |
1162 | error_metadata_pipe: | |
1163 | utils_close_pipe(ctx->consumer_thread_pipe); | |
3bd1e081 MD |
1164 | error_thread_pipe: |
1165 | for (i = 0; i < 2; i++) { | |
1166 | int err; | |
1167 | ||
1168 | err = close(ctx->consumer_should_quit[i]); | |
4c462e79 MD |
1169 | if (err) { |
1170 | PERROR("close"); | |
1171 | } | |
3bd1e081 | 1172 | } |
04fdd819 | 1173 | error_poll_fcntl: |
3bd1e081 MD |
1174 | error_quit_pipe: |
1175 | for (i = 0; i < 2; i++) { | |
1176 | int err; | |
1177 | ||
50f8ae69 | 1178 | err = close(ctx->consumer_data_pipe[i]); |
4c462e79 MD |
1179 | if (err) { |
1180 | PERROR("close"); | |
1181 | } | |
3bd1e081 MD |
1182 | } |
1183 | error_poll_pipe: | |
1184 | free(ctx); | |
1185 | error: | |
1186 | return NULL; | |
1187 | } | |
1188 | ||
1189 | /* | |
1190 | * Close all fds associated with the instance and free the context. | |
1191 | */ | |
1192 | void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx) | |
1193 | { | |
4c462e79 MD |
1194 | int ret; |
1195 | ||
ab1027f4 DG |
1196 | DBG("Consumer destroying it. Closing everything."); |
1197 | ||
4c462e79 MD |
1198 | ret = close(ctx->consumer_error_socket); |
1199 | if (ret) { | |
1200 | PERROR("close"); | |
1201 | } | |
1202 | ret = close(ctx->consumer_thread_pipe[0]); | |
1203 | if (ret) { | |
1204 | PERROR("close"); | |
1205 | } | |
1206 | ret = close(ctx->consumer_thread_pipe[1]); | |
1207 | if (ret) { | |
1208 | PERROR("close"); | |
1209 | } | |
50f8ae69 | 1210 | ret = close(ctx->consumer_data_pipe[0]); |
4c462e79 MD |
1211 | if (ret) { |
1212 | PERROR("close"); | |
1213 | } | |
50f8ae69 | 1214 | ret = close(ctx->consumer_data_pipe[1]); |
4c462e79 MD |
1215 | if (ret) { |
1216 | PERROR("close"); | |
1217 | } | |
1218 | ret = close(ctx->consumer_should_quit[0]); | |
1219 | if (ret) { | |
1220 | PERROR("close"); | |
1221 | } | |
1222 | ret = close(ctx->consumer_should_quit[1]); | |
1223 | if (ret) { | |
1224 | PERROR("close"); | |
1225 | } | |
fb3a43a9 DG |
1226 | utils_close_pipe(ctx->consumer_splice_metadata_pipe); |
1227 | ||
3bd1e081 MD |
1228 | unlink(ctx->consumer_command_sock_path); |
1229 | free(ctx); | |
1230 | } | |
1231 | ||
6197aea7 DG |
1232 | /* |
1233 | * Write the metadata stream id on the specified file descriptor. | |
1234 | */ | |
1235 | static int write_relayd_metadata_id(int fd, | |
1236 | struct lttng_consumer_stream *stream, | |
1d4dfdef DG |
1237 | struct consumer_relayd_sock_pair *relayd, |
1238 | unsigned long padding) | |
6197aea7 DG |
1239 | { |
1240 | int ret; | |
1d4dfdef | 1241 | struct lttcomm_relayd_metadata_payload hdr; |
6197aea7 | 1242 | |
1d4dfdef DG |
1243 | hdr.stream_id = htobe64(stream->relayd_stream_id); |
1244 | hdr.padding_size = htobe32(padding); | |
6197aea7 | 1245 | do { |
1d4dfdef | 1246 | ret = write(fd, (void *) &hdr, sizeof(hdr)); |
6197aea7 DG |
1247 | } while (ret < 0 && errno == EINTR); |
1248 | if (ret < 0) { | |
1249 | PERROR("write metadata stream id"); | |
1250 | goto end; | |
1251 | } | |
1d4dfdef DG |
1252 | DBG("Metadata stream id %" PRIu64 " with padding %lu written before data", |
1253 | stream->relayd_stream_id, padding); | |
6197aea7 DG |
1254 | |
1255 | end: | |
1256 | return ret; | |
1257 | } | |
1258 | ||
3bd1e081 | 1259 | /* |
09e26845 DG |
1260 | * Mmap the ring buffer, read it and write the data to the tracefile. This is a |
1261 | * core function for writing trace buffers to either the local filesystem or | |
1262 | * the network. | |
1263 | * | |
1264 | * Careful review MUST be put if any changes occur! | |
3bd1e081 MD |
1265 | * |
1266 | * Returns the number of bytes written | |
1267 | */ | |
4078b776 | 1268 | ssize_t lttng_consumer_on_read_subbuffer_mmap( |
3bd1e081 | 1269 | struct lttng_consumer_local_data *ctx, |
1d4dfdef DG |
1270 | struct lttng_consumer_stream *stream, unsigned long len, |
1271 | unsigned long padding) | |
3bd1e081 | 1272 | { |
f02e1e8a DG |
1273 | unsigned long mmap_offset; |
1274 | ssize_t ret = 0, written = 0; | |
1275 | off_t orig_offset = stream->out_fd_offset; | |
1276 | /* Default is on the disk */ | |
1277 | int outfd = stream->out_fd; | |
f02e1e8a | 1278 | struct consumer_relayd_sock_pair *relayd = NULL; |
8994307f | 1279 | unsigned int relayd_hang_up = 0; |
f02e1e8a DG |
1280 | |
1281 | /* RCU lock for the relayd pointer */ | |
1282 | rcu_read_lock(); | |
1283 | ||
c8f59ee5 DG |
1284 | pthread_mutex_lock(&stream->lock); |
1285 | ||
f02e1e8a DG |
1286 | /* Flag that the current stream if set for network streaming. */ |
1287 | if (stream->net_seq_idx != -1) { | |
1288 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1289 | if (relayd == NULL) { | |
1290 | goto end; | |
1291 | } | |
1292 | } | |
1293 | ||
1294 | /* get the offset inside the fd to mmap */ | |
3bd1e081 MD |
1295 | switch (consumer_data.type) { |
1296 | case LTTNG_CONSUMER_KERNEL: | |
f02e1e8a DG |
1297 | ret = kernctl_get_mmap_read_offset(stream->wait_fd, &mmap_offset); |
1298 | break; | |
7753dea8 MD |
1299 | case LTTNG_CONSUMER32_UST: |
1300 | case LTTNG_CONSUMER64_UST: | |
f02e1e8a DG |
1301 | ret = lttng_ustctl_get_mmap_read_offset(stream->chan->handle, |
1302 | stream->buf, &mmap_offset); | |
1303 | break; | |
3bd1e081 MD |
1304 | default: |
1305 | ERR("Unknown consumer_data type"); | |
1306 | assert(0); | |
1307 | } | |
f02e1e8a DG |
1308 | if (ret != 0) { |
1309 | errno = -ret; | |
1310 | PERROR("tracer ctl get_mmap_read_offset"); | |
1311 | written = ret; | |
1312 | goto end; | |
1313 | } | |
b9182dd9 | 1314 | |
f02e1e8a DG |
1315 | /* Handle stream on the relayd if the output is on the network */ |
1316 | if (relayd) { | |
1317 | unsigned long netlen = len; | |
1318 | ||
1319 | /* | |
1320 | * Lock the control socket for the complete duration of the function | |
1321 | * since from this point on we will use the socket. | |
1322 | */ | |
1323 | if (stream->metadata_flag) { | |
1324 | /* Metadata requires the control socket. */ | |
1325 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1d4dfdef | 1326 | netlen += sizeof(struct lttcomm_relayd_metadata_payload); |
f02e1e8a DG |
1327 | } |
1328 | ||
1d4dfdef | 1329 | ret = write_relayd_stream_header(stream, netlen, padding, relayd); |
f02e1e8a DG |
1330 | if (ret >= 0) { |
1331 | /* Use the returned socket. */ | |
1332 | outfd = ret; | |
1333 | ||
1334 | /* Write metadata stream id before payload */ | |
1335 | if (stream->metadata_flag) { | |
1d4dfdef | 1336 | ret = write_relayd_metadata_id(outfd, stream, relayd, padding); |
f02e1e8a | 1337 | if (ret < 0) { |
f02e1e8a | 1338 | written = ret; |
8994307f DG |
1339 | /* Socket operation failed. We consider the relayd dead */ |
1340 | if (ret == -EPIPE || ret == -EINVAL) { | |
1341 | relayd_hang_up = 1; | |
1342 | goto write_error; | |
1343 | } | |
f02e1e8a DG |
1344 | goto end; |
1345 | } | |
f02e1e8a | 1346 | } |
8994307f DG |
1347 | } else { |
1348 | /* Socket operation failed. We consider the relayd dead */ | |
1349 | if (ret == -EPIPE || ret == -EINVAL) { | |
1350 | relayd_hang_up = 1; | |
1351 | goto write_error; | |
1352 | } | |
1353 | /* Else, use the default set before which is the filesystem. */ | |
f02e1e8a | 1354 | } |
1d4dfdef DG |
1355 | } else { |
1356 | /* No streaming, we have to set the len with the full padding */ | |
1357 | len += padding; | |
f02e1e8a DG |
1358 | } |
1359 | ||
1360 | while (len > 0) { | |
1361 | do { | |
1362 | ret = write(outfd, stream->mmap_base + mmap_offset, len); | |
1363 | } while (ret < 0 && errno == EINTR); | |
1d4dfdef | 1364 | DBG("Consumer mmap write() ret %zd (len %lu)", ret, len); |
f02e1e8a DG |
1365 | if (ret < 0) { |
1366 | PERROR("Error in file write"); | |
1367 | if (written == 0) { | |
1368 | written = ret; | |
1369 | } | |
8994307f DG |
1370 | /* Socket operation failed. We consider the relayd dead */ |
1371 | if (errno == EPIPE || errno == EINVAL) { | |
1372 | relayd_hang_up = 1; | |
1373 | goto write_error; | |
1374 | } | |
f02e1e8a DG |
1375 | goto end; |
1376 | } else if (ret > len) { | |
77c7c900 | 1377 | PERROR("Error in file write (ret %zd > len %lu)", ret, len); |
f02e1e8a DG |
1378 | written += ret; |
1379 | goto end; | |
1380 | } else { | |
1381 | len -= ret; | |
1382 | mmap_offset += ret; | |
1383 | } | |
f02e1e8a DG |
1384 | |
1385 | /* This call is useless on a socket so better save a syscall. */ | |
1386 | if (!relayd) { | |
1387 | /* This won't block, but will start writeout asynchronously */ | |
1388 | lttng_sync_file_range(outfd, stream->out_fd_offset, ret, | |
1389 | SYNC_FILE_RANGE_WRITE); | |
1390 | stream->out_fd_offset += ret; | |
1391 | } | |
1392 | written += ret; | |
1393 | } | |
1394 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
1395 | ||
8994307f DG |
1396 | write_error: |
1397 | /* | |
1398 | * This is a special case that the relayd has closed its socket. Let's | |
1399 | * cleanup the relayd object and all associated streams. | |
1400 | */ | |
1401 | if (relayd && relayd_hang_up) { | |
1402 | cleanup_relayd(relayd, ctx); | |
1403 | } | |
1404 | ||
f02e1e8a DG |
1405 | end: |
1406 | /* Unlock only if ctrl socket used */ | |
1407 | if (relayd && stream->metadata_flag) { | |
1408 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1409 | } | |
6f6eda74 | 1410 | pthread_mutex_unlock(&stream->lock); |
f02e1e8a DG |
1411 | |
1412 | rcu_read_unlock(); | |
1413 | return written; | |
3bd1e081 MD |
1414 | } |
1415 | ||
1416 | /* | |
1417 | * Splice the data from the ring buffer to the tracefile. | |
1418 | * | |
1419 | * Returns the number of bytes spliced. | |
1420 | */ | |
4078b776 | 1421 | ssize_t lttng_consumer_on_read_subbuffer_splice( |
3bd1e081 | 1422 | struct lttng_consumer_local_data *ctx, |
1d4dfdef DG |
1423 | struct lttng_consumer_stream *stream, unsigned long len, |
1424 | unsigned long padding) | |
3bd1e081 | 1425 | { |
f02e1e8a DG |
1426 | ssize_t ret = 0, written = 0, ret_splice = 0; |
1427 | loff_t offset = 0; | |
1428 | off_t orig_offset = stream->out_fd_offset; | |
1429 | int fd = stream->wait_fd; | |
1430 | /* Default is on the disk */ | |
1431 | int outfd = stream->out_fd; | |
f02e1e8a | 1432 | struct consumer_relayd_sock_pair *relayd = NULL; |
fb3a43a9 | 1433 | int *splice_pipe; |
8994307f | 1434 | unsigned int relayd_hang_up = 0; |
f02e1e8a | 1435 | |
3bd1e081 MD |
1436 | switch (consumer_data.type) { |
1437 | case LTTNG_CONSUMER_KERNEL: | |
f02e1e8a | 1438 | break; |
7753dea8 MD |
1439 | case LTTNG_CONSUMER32_UST: |
1440 | case LTTNG_CONSUMER64_UST: | |
f02e1e8a | 1441 | /* Not supported for user space tracing */ |
3bd1e081 MD |
1442 | return -ENOSYS; |
1443 | default: | |
1444 | ERR("Unknown consumer_data type"); | |
1445 | assert(0); | |
3bd1e081 MD |
1446 | } |
1447 | ||
f02e1e8a DG |
1448 | /* RCU lock for the relayd pointer */ |
1449 | rcu_read_lock(); | |
1450 | ||
c8f59ee5 DG |
1451 | pthread_mutex_lock(&stream->lock); |
1452 | ||
f02e1e8a DG |
1453 | /* Flag that the current stream if set for network streaming. */ |
1454 | if (stream->net_seq_idx != -1) { | |
1455 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1456 | if (relayd == NULL) { | |
1457 | goto end; | |
1458 | } | |
1459 | } | |
1460 | ||
fb3a43a9 DG |
1461 | /* |
1462 | * Choose right pipe for splice. Metadata and trace data are handled by | |
1463 | * different threads hence the use of two pipes in order not to race or | |
1464 | * corrupt the written data. | |
1465 | */ | |
1466 | if (stream->metadata_flag) { | |
1467 | splice_pipe = ctx->consumer_splice_metadata_pipe; | |
1468 | } else { | |
1469 | splice_pipe = ctx->consumer_thread_pipe; | |
1470 | } | |
1471 | ||
f02e1e8a | 1472 | /* Write metadata stream id before payload */ |
1d4dfdef DG |
1473 | if (relayd) { |
1474 | int total_len = len; | |
f02e1e8a | 1475 | |
1d4dfdef DG |
1476 | if (stream->metadata_flag) { |
1477 | /* | |
1478 | * Lock the control socket for the complete duration of the function | |
1479 | * since from this point on we will use the socket. | |
1480 | */ | |
1481 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1482 | ||
1483 | ret = write_relayd_metadata_id(splice_pipe[1], stream, relayd, | |
1484 | padding); | |
1485 | if (ret < 0) { | |
1486 | written = ret; | |
8994307f DG |
1487 | /* Socket operation failed. We consider the relayd dead */ |
1488 | if (ret == -EBADF) { | |
1489 | WARN("Remote relayd disconnected. Stopping"); | |
1490 | relayd_hang_up = 1; | |
1491 | goto write_error; | |
1492 | } | |
1d4dfdef DG |
1493 | goto end; |
1494 | } | |
1495 | ||
1496 | total_len += sizeof(struct lttcomm_relayd_metadata_payload); | |
1497 | } | |
1498 | ||
1499 | ret = write_relayd_stream_header(stream, total_len, padding, relayd); | |
1500 | if (ret >= 0) { | |
1501 | /* Use the returned socket. */ | |
1502 | outfd = ret; | |
1503 | } else { | |
8994307f DG |
1504 | /* Socket operation failed. We consider the relayd dead */ |
1505 | if (ret == -EBADF) { | |
1506 | WARN("Remote relayd disconnected. Stopping"); | |
1507 | relayd_hang_up = 1; | |
1508 | goto write_error; | |
1509 | } | |
f02e1e8a DG |
1510 | goto end; |
1511 | } | |
1d4dfdef DG |
1512 | } else { |
1513 | /* No streaming, we have to set the len with the full padding */ | |
1514 | len += padding; | |
f02e1e8a DG |
1515 | } |
1516 | ||
1517 | while (len > 0) { | |
1d4dfdef DG |
1518 | DBG("splice chan to pipe offset %lu of len %lu (fd : %d, pipe: %d)", |
1519 | (unsigned long)offset, len, fd, splice_pipe[1]); | |
fb3a43a9 | 1520 | ret_splice = splice(fd, &offset, splice_pipe[1], NULL, len, |
f02e1e8a DG |
1521 | SPLICE_F_MOVE | SPLICE_F_MORE); |
1522 | DBG("splice chan to pipe, ret %zd", ret_splice); | |
1523 | if (ret_splice < 0) { | |
1524 | PERROR("Error in relay splice"); | |
1525 | if (written == 0) { | |
1526 | written = ret_splice; | |
1527 | } | |
1528 | ret = errno; | |
1529 | goto splice_error; | |
1530 | } | |
1531 | ||
1532 | /* Handle stream on the relayd if the output is on the network */ | |
1533 | if (relayd) { | |
1534 | if (stream->metadata_flag) { | |
1d4dfdef DG |
1535 | size_t metadata_payload_size = |
1536 | sizeof(struct lttcomm_relayd_metadata_payload); | |
1537 | ||
f02e1e8a | 1538 | /* Update counter to fit the spliced data */ |
1d4dfdef DG |
1539 | ret_splice += metadata_payload_size; |
1540 | len += metadata_payload_size; | |
f02e1e8a DG |
1541 | /* |
1542 | * We do this so the return value can match the len passed as | |
1543 | * argument to this function. | |
1544 | */ | |
1d4dfdef | 1545 | written -= metadata_payload_size; |
f02e1e8a DG |
1546 | } |
1547 | } | |
1548 | ||
1549 | /* Splice data out */ | |
fb3a43a9 | 1550 | ret_splice = splice(splice_pipe[0], NULL, outfd, NULL, |
f02e1e8a | 1551 | ret_splice, SPLICE_F_MOVE | SPLICE_F_MORE); |
1d4dfdef | 1552 | DBG("Consumer splice pipe to file, ret %zd", ret_splice); |
f02e1e8a DG |
1553 | if (ret_splice < 0) { |
1554 | PERROR("Error in file splice"); | |
1555 | if (written == 0) { | |
1556 | written = ret_splice; | |
1557 | } | |
8994307f | 1558 | /* Socket operation failed. We consider the relayd dead */ |
00c8752b | 1559 | if (errno == EBADF || errno == EPIPE) { |
8994307f DG |
1560 | WARN("Remote relayd disconnected. Stopping"); |
1561 | relayd_hang_up = 1; | |
1562 | goto write_error; | |
1563 | } | |
f02e1e8a DG |
1564 | ret = errno; |
1565 | goto splice_error; | |
1566 | } else if (ret_splice > len) { | |
1567 | errno = EINVAL; | |
1568 | PERROR("Wrote more data than requested %zd (len: %lu)", | |
1569 | ret_splice, len); | |
1570 | written += ret_splice; | |
1571 | ret = errno; | |
1572 | goto splice_error; | |
1573 | } | |
1574 | len -= ret_splice; | |
1575 | ||
1576 | /* This call is useless on a socket so better save a syscall. */ | |
1577 | if (!relayd) { | |
1578 | /* This won't block, but will start writeout asynchronously */ | |
1579 | lttng_sync_file_range(outfd, stream->out_fd_offset, ret_splice, | |
1580 | SYNC_FILE_RANGE_WRITE); | |
1581 | stream->out_fd_offset += ret_splice; | |
1582 | } | |
1583 | written += ret_splice; | |
1584 | } | |
1585 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
1586 | ||
1587 | ret = ret_splice; | |
1588 | ||
1589 | goto end; | |
1590 | ||
8994307f DG |
1591 | write_error: |
1592 | /* | |
1593 | * This is a special case that the relayd has closed its socket. Let's | |
1594 | * cleanup the relayd object and all associated streams. | |
1595 | */ | |
1596 | if (relayd && relayd_hang_up) { | |
1597 | cleanup_relayd(relayd, ctx); | |
1598 | /* Skip splice error so the consumer does not fail */ | |
1599 | goto end; | |
1600 | } | |
1601 | ||
f02e1e8a DG |
1602 | splice_error: |
1603 | /* send the appropriate error description to sessiond */ | |
1604 | switch (ret) { | |
f02e1e8a | 1605 | case EINVAL: |
f73fabfd | 1606 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_EINVAL); |
f02e1e8a DG |
1607 | break; |
1608 | case ENOMEM: | |
f73fabfd | 1609 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ENOMEM); |
f02e1e8a DG |
1610 | break; |
1611 | case ESPIPE: | |
f73fabfd | 1612 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ESPIPE); |
f02e1e8a DG |
1613 | break; |
1614 | } | |
1615 | ||
1616 | end: | |
1617 | if (relayd && stream->metadata_flag) { | |
1618 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1619 | } | |
6f6eda74 | 1620 | pthread_mutex_unlock(&stream->lock); |
f02e1e8a DG |
1621 | |
1622 | rcu_read_unlock(); | |
1623 | return written; | |
3bd1e081 MD |
1624 | } |
1625 | ||
1626 | /* | |
1627 | * Take a snapshot for a specific fd | |
1628 | * | |
1629 | * Returns 0 on success, < 0 on error | |
1630 | */ | |
1631 | int lttng_consumer_take_snapshot(struct lttng_consumer_local_data *ctx, | |
1632 | struct lttng_consumer_stream *stream) | |
1633 | { | |
1634 | switch (consumer_data.type) { | |
1635 | case LTTNG_CONSUMER_KERNEL: | |
1636 | return lttng_kconsumer_take_snapshot(ctx, stream); | |
7753dea8 MD |
1637 | case LTTNG_CONSUMER32_UST: |
1638 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1639 | return lttng_ustconsumer_take_snapshot(ctx, stream); |
1640 | default: | |
1641 | ERR("Unknown consumer_data type"); | |
1642 | assert(0); | |
1643 | return -ENOSYS; | |
1644 | } | |
1645 | ||
1646 | } | |
1647 | ||
1648 | /* | |
1649 | * Get the produced position | |
1650 | * | |
1651 | * Returns 0 on success, < 0 on error | |
1652 | */ | |
1653 | int lttng_consumer_get_produced_snapshot( | |
1654 | struct lttng_consumer_local_data *ctx, | |
1655 | struct lttng_consumer_stream *stream, | |
1656 | unsigned long *pos) | |
1657 | { | |
1658 | switch (consumer_data.type) { | |
1659 | case LTTNG_CONSUMER_KERNEL: | |
1660 | return lttng_kconsumer_get_produced_snapshot(ctx, stream, pos); | |
7753dea8 MD |
1661 | case LTTNG_CONSUMER32_UST: |
1662 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1663 | return lttng_ustconsumer_get_produced_snapshot(ctx, stream, pos); |
1664 | default: | |
1665 | ERR("Unknown consumer_data type"); | |
1666 | assert(0); | |
1667 | return -ENOSYS; | |
1668 | } | |
1669 | } | |
1670 | ||
1671 | int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, | |
1672 | int sock, struct pollfd *consumer_sockpoll) | |
1673 | { | |
1674 | switch (consumer_data.type) { | |
1675 | case LTTNG_CONSUMER_KERNEL: | |
1676 | return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
7753dea8 MD |
1677 | case LTTNG_CONSUMER32_UST: |
1678 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1679 | return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll); |
1680 | default: | |
1681 | ERR("Unknown consumer_data type"); | |
1682 | assert(0); | |
1683 | return -ENOSYS; | |
1684 | } | |
1685 | } | |
1686 | ||
43c34bc3 DG |
1687 | /* |
1688 | * Iterate over all streams of the hashtable and free them properly. | |
1689 | * | |
1690 | * WARNING: *MUST* be used with data stream only. | |
1691 | */ | |
1692 | static void destroy_data_stream_ht(struct lttng_ht *ht) | |
1693 | { | |
1694 | int ret; | |
1695 | struct lttng_ht_iter iter; | |
1696 | struct lttng_consumer_stream *stream; | |
1697 | ||
1698 | if (ht == NULL) { | |
1699 | return; | |
1700 | } | |
1701 | ||
1702 | rcu_read_lock(); | |
1703 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { | |
1704 | ret = lttng_ht_del(ht, &iter); | |
1705 | assert(!ret); | |
1706 | ||
1707 | call_rcu(&stream->node.head, consumer_free_stream); | |
1708 | } | |
1709 | rcu_read_unlock(); | |
1710 | ||
1711 | lttng_ht_destroy(ht); | |
1712 | } | |
1713 | ||
fb3a43a9 | 1714 | /* |
f724d81e | 1715 | * Iterate over all streams of the hashtable and free them properly. |
e316aad5 DG |
1716 | * |
1717 | * XXX: Should not be only for metadata stream or else use an other name. | |
fb3a43a9 DG |
1718 | */ |
1719 | static void destroy_stream_ht(struct lttng_ht *ht) | |
1720 | { | |
1721 | int ret; | |
1722 | struct lttng_ht_iter iter; | |
1723 | struct lttng_consumer_stream *stream; | |
1724 | ||
1725 | if (ht == NULL) { | |
1726 | return; | |
1727 | } | |
1728 | ||
d09e1200 | 1729 | rcu_read_lock(); |
58b1f425 | 1730 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { |
fb3a43a9 DG |
1731 | ret = lttng_ht_del(ht, &iter); |
1732 | assert(!ret); | |
1733 | ||
58b1f425 | 1734 | call_rcu(&stream->node.head, consumer_free_stream); |
fb3a43a9 | 1735 | } |
d09e1200 | 1736 | rcu_read_unlock(); |
fb3a43a9 DG |
1737 | |
1738 | lttng_ht_destroy(ht); | |
1739 | } | |
1740 | ||
1741 | /* | |
1742 | * Clean up a metadata stream and free its memory. | |
1743 | */ | |
e316aad5 DG |
1744 | void consumer_del_metadata_stream(struct lttng_consumer_stream *stream, |
1745 | struct lttng_ht *ht) | |
fb3a43a9 DG |
1746 | { |
1747 | int ret; | |
e316aad5 DG |
1748 | struct lttng_ht_iter iter; |
1749 | struct lttng_consumer_channel *free_chan = NULL; | |
fb3a43a9 DG |
1750 | struct consumer_relayd_sock_pair *relayd; |
1751 | ||
1752 | assert(stream); | |
1753 | /* | |
1754 | * This call should NEVER receive regular stream. It must always be | |
1755 | * metadata stream and this is crucial for data structure synchronization. | |
1756 | */ | |
1757 | assert(stream->metadata_flag); | |
1758 | ||
e316aad5 DG |
1759 | DBG3("Consumer delete metadata stream %d", stream->wait_fd); |
1760 | ||
1761 | if (ht == NULL) { | |
1762 | /* Means the stream was allocated but not successfully added */ | |
1763 | goto free_stream; | |
1764 | } | |
1765 | ||
8994307f DG |
1766 | pthread_mutex_lock(&stream->lock); |
1767 | ||
fb3a43a9 DG |
1768 | pthread_mutex_lock(&consumer_data.lock); |
1769 | switch (consumer_data.type) { | |
1770 | case LTTNG_CONSUMER_KERNEL: | |
1771 | if (stream->mmap_base != NULL) { | |
1772 | ret = munmap(stream->mmap_base, stream->mmap_len); | |
1773 | if (ret != 0) { | |
1774 | PERROR("munmap metadata stream"); | |
1775 | } | |
1776 | } | |
1777 | break; | |
1778 | case LTTNG_CONSUMER32_UST: | |
1779 | case LTTNG_CONSUMER64_UST: | |
1780 | lttng_ustconsumer_del_stream(stream); | |
1781 | break; | |
1782 | default: | |
1783 | ERR("Unknown consumer_data type"); | |
1784 | assert(0); | |
e316aad5 | 1785 | goto end; |
fb3a43a9 | 1786 | } |
fb3a43a9 | 1787 | |
c869f647 | 1788 | rcu_read_lock(); |
58b1f425 | 1789 | iter.iter.node = &stream->node.node; |
c869f647 DG |
1790 | ret = lttng_ht_del(ht, &iter); |
1791 | assert(!ret); | |
ca22feea DG |
1792 | |
1793 | /* Remove node session id from the consumer_data stream ht */ | |
1794 | iter.iter.node = &stream->node_session_id.node; | |
1795 | ret = lttng_ht_del(consumer_data.stream_list_ht, &iter); | |
1796 | assert(!ret); | |
c869f647 DG |
1797 | rcu_read_unlock(); |
1798 | ||
fb3a43a9 DG |
1799 | if (stream->out_fd >= 0) { |
1800 | ret = close(stream->out_fd); | |
1801 | if (ret) { | |
1802 | PERROR("close"); | |
1803 | } | |
1804 | } | |
1805 | ||
1806 | if (stream->wait_fd >= 0 && !stream->wait_fd_is_copy) { | |
1807 | ret = close(stream->wait_fd); | |
1808 | if (ret) { | |
1809 | PERROR("close"); | |
1810 | } | |
1811 | } | |
1812 | ||
1813 | if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) { | |
1814 | ret = close(stream->shm_fd); | |
1815 | if (ret) { | |
1816 | PERROR("close"); | |
1817 | } | |
1818 | } | |
1819 | ||
1820 | /* Check and cleanup relayd */ | |
1821 | rcu_read_lock(); | |
1822 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1823 | if (relayd != NULL) { | |
1824 | uatomic_dec(&relayd->refcount); | |
1825 | assert(uatomic_read(&relayd->refcount) >= 0); | |
1826 | ||
1827 | /* Closing streams requires to lock the control socket. */ | |
1828 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1829 | ret = relayd_send_close_stream(&relayd->control_sock, | |
1830 | stream->relayd_stream_id, stream->next_net_seq_num - 1); | |
1831 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1832 | if (ret < 0) { | |
1833 | DBG("Unable to close stream on the relayd. Continuing"); | |
1834 | /* | |
1835 | * Continue here. There is nothing we can do for the relayd. | |
1836 | * Chances are that the relayd has closed the socket so we just | |
1837 | * continue cleaning up. | |
1838 | */ | |
1839 | } | |
1840 | ||
1841 | /* Both conditions are met, we destroy the relayd. */ | |
1842 | if (uatomic_read(&relayd->refcount) == 0 && | |
1843 | uatomic_read(&relayd->destroy_flag)) { | |
d09e1200 | 1844 | destroy_relayd(relayd); |
fb3a43a9 DG |
1845 | } |
1846 | } | |
1847 | rcu_read_unlock(); | |
1848 | ||
1849 | /* Atomically decrement channel refcount since other threads can use it. */ | |
1850 | uatomic_dec(&stream->chan->refcount); | |
c30aaa51 MD |
1851 | if (!uatomic_read(&stream->chan->refcount) |
1852 | && !uatomic_read(&stream->chan->nb_init_streams)) { | |
1853 | /* Go for channel deletion! */ | |
e316aad5 | 1854 | free_chan = stream->chan; |
fb3a43a9 DG |
1855 | } |
1856 | ||
e316aad5 DG |
1857 | end: |
1858 | pthread_mutex_unlock(&consumer_data.lock); | |
8994307f | 1859 | pthread_mutex_unlock(&stream->lock); |
e316aad5 DG |
1860 | |
1861 | if (free_chan) { | |
1862 | consumer_del_channel(free_chan); | |
1863 | } | |
1864 | ||
1865 | free_stream: | |
58b1f425 | 1866 | call_rcu(&stream->node.head, consumer_free_stream); |
fb3a43a9 DG |
1867 | } |
1868 | ||
1869 | /* | |
1870 | * Action done with the metadata stream when adding it to the consumer internal | |
1871 | * data structures to handle it. | |
1872 | */ | |
e316aad5 DG |
1873 | static int consumer_add_metadata_stream(struct lttng_consumer_stream *stream, |
1874 | struct lttng_ht *ht) | |
fb3a43a9 | 1875 | { |
e316aad5 | 1876 | int ret = 0; |
fb3a43a9 DG |
1877 | struct consumer_relayd_sock_pair *relayd; |
1878 | ||
e316aad5 DG |
1879 | assert(stream); |
1880 | assert(ht); | |
1881 | ||
1882 | DBG3("Adding metadata stream %d to hash table", stream->wait_fd); | |
1883 | ||
1884 | pthread_mutex_lock(&consumer_data.lock); | |
1885 | ||
e316aad5 DG |
1886 | /* |
1887 | * From here, refcounts are updated so be _careful_ when returning an error | |
1888 | * after this point. | |
1889 | */ | |
1890 | ||
fb3a43a9 | 1891 | rcu_read_lock(); |
e316aad5 | 1892 | /* Find relayd and, if one is found, increment refcount. */ |
fb3a43a9 DG |
1893 | relayd = consumer_find_relayd(stream->net_seq_idx); |
1894 | if (relayd != NULL) { | |
1895 | uatomic_inc(&relayd->refcount); | |
1896 | } | |
e316aad5 DG |
1897 | |
1898 | /* Update channel refcount once added without error(s). */ | |
1899 | uatomic_inc(&stream->chan->refcount); | |
1900 | ||
1901 | /* | |
1902 | * When nb_init_streams reaches 0, we don't need to trigger any action in | |
1903 | * terms of destroying the associated channel, because the action that | |
1904 | * causes the count to become 0 also causes a stream to be added. The | |
1905 | * channel deletion will thus be triggered by the following removal of this | |
1906 | * stream. | |
1907 | */ | |
1908 | if (uatomic_read(&stream->chan->nb_init_streams) > 0) { | |
1909 | uatomic_dec(&stream->chan->nb_init_streams); | |
1910 | } | |
1911 | ||
43c34bc3 DG |
1912 | /* Steal stream identifier to avoid having streams with the same key */ |
1913 | consumer_steal_stream_key(stream->key, ht); | |
1914 | ||
58b1f425 | 1915 | lttng_ht_add_unique_ulong(ht, &stream->node); |
ca22feea DG |
1916 | |
1917 | /* | |
1918 | * Add stream to the stream_list_ht of the consumer data. No need to steal | |
1919 | * the key since the HT does not use it and we allow to add redundant keys | |
1920 | * into this table. | |
1921 | */ | |
1922 | lttng_ht_add_ulong(consumer_data.stream_list_ht, &stream->node_session_id); | |
1923 | ||
fb3a43a9 | 1924 | rcu_read_unlock(); |
e316aad5 | 1925 | |
e316aad5 DG |
1926 | pthread_mutex_unlock(&consumer_data.lock); |
1927 | return ret; | |
fb3a43a9 DG |
1928 | } |
1929 | ||
8994307f DG |
1930 | /* |
1931 | * Delete data stream that are flagged for deletion (endpoint_status). | |
1932 | */ | |
1933 | static void validate_endpoint_status_data_stream(void) | |
1934 | { | |
1935 | struct lttng_ht_iter iter; | |
1936 | struct lttng_consumer_stream *stream; | |
1937 | ||
1938 | DBG("Consumer delete flagged data stream"); | |
1939 | ||
1940 | rcu_read_lock(); | |
1941 | cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) { | |
1942 | /* Validate delete flag of the stream */ | |
9617607b | 1943 | if (stream->endpoint_status != CONSUMER_ENDPOINT_INACTIVE) { |
8994307f DG |
1944 | continue; |
1945 | } | |
1946 | /* Delete it right now */ | |
1947 | consumer_del_stream(stream, data_ht); | |
1948 | } | |
1949 | rcu_read_unlock(); | |
1950 | } | |
1951 | ||
1952 | /* | |
1953 | * Delete metadata stream that are flagged for deletion (endpoint_status). | |
1954 | */ | |
1955 | static void validate_endpoint_status_metadata_stream( | |
1956 | struct lttng_poll_event *pollset) | |
1957 | { | |
1958 | struct lttng_ht_iter iter; | |
1959 | struct lttng_consumer_stream *stream; | |
1960 | ||
1961 | DBG("Consumer delete flagged metadata stream"); | |
1962 | ||
1963 | assert(pollset); | |
1964 | ||
1965 | rcu_read_lock(); | |
1966 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) { | |
1967 | /* Validate delete flag of the stream */ | |
1968 | if (!stream->endpoint_status) { | |
1969 | continue; | |
1970 | } | |
1971 | /* | |
1972 | * Remove from pollset so the metadata thread can continue without | |
1973 | * blocking on a deleted stream. | |
1974 | */ | |
1975 | lttng_poll_del(pollset, stream->wait_fd); | |
1976 | ||
1977 | /* Delete it right now */ | |
1978 | consumer_del_metadata_stream(stream, metadata_ht); | |
1979 | } | |
1980 | rcu_read_unlock(); | |
1981 | } | |
1982 | ||
fb3a43a9 DG |
1983 | /* |
1984 | * Thread polls on metadata file descriptor and write them on disk or on the | |
1985 | * network. | |
1986 | */ | |
7d980def | 1987 | void *consumer_thread_metadata_poll(void *data) |
fb3a43a9 DG |
1988 | { |
1989 | int ret, i, pollfd; | |
1990 | uint32_t revents, nb_fd; | |
e316aad5 | 1991 | struct lttng_consumer_stream *stream = NULL; |
fb3a43a9 DG |
1992 | struct lttng_ht_iter iter; |
1993 | struct lttng_ht_node_ulong *node; | |
fb3a43a9 DG |
1994 | struct lttng_poll_event events; |
1995 | struct lttng_consumer_local_data *ctx = data; | |
1996 | ssize_t len; | |
1997 | ||
1998 | rcu_register_thread(); | |
1999 | ||
2000 | DBG("Thread metadata poll started"); | |
2001 | ||
fb3a43a9 DG |
2002 | /* Size is set to 1 for the consumer_metadata pipe */ |
2003 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
2004 | if (ret < 0) { | |
2005 | ERR("Poll set creation failed"); | |
2006 | goto end; | |
2007 | } | |
2008 | ||
2009 | ret = lttng_poll_add(&events, ctx->consumer_metadata_pipe[0], LPOLLIN); | |
2010 | if (ret < 0) { | |
2011 | goto end; | |
2012 | } | |
2013 | ||
2014 | /* Main loop */ | |
2015 | DBG("Metadata main loop started"); | |
2016 | ||
2017 | while (1) { | |
2018 | lttng_poll_reset(&events); | |
2019 | ||
2020 | nb_fd = LTTNG_POLL_GETNB(&events); | |
2021 | ||
2022 | /* Only the metadata pipe is set */ | |
2023 | if (nb_fd == 0 && consumer_quit == 1) { | |
2024 | goto end; | |
2025 | } | |
2026 | ||
2027 | restart: | |
2028 | DBG("Metadata poll wait with %d fd(s)", nb_fd); | |
2029 | ret = lttng_poll_wait(&events, -1); | |
2030 | DBG("Metadata event catched in thread"); | |
2031 | if (ret < 0) { | |
2032 | if (errno == EINTR) { | |
e316aad5 | 2033 | ERR("Poll EINTR catched"); |
fb3a43a9 DG |
2034 | goto restart; |
2035 | } | |
2036 | goto error; | |
2037 | } | |
2038 | ||
e316aad5 | 2039 | /* From here, the event is a metadata wait fd */ |
fb3a43a9 DG |
2040 | for (i = 0; i < nb_fd; i++) { |
2041 | revents = LTTNG_POLL_GETEV(&events, i); | |
2042 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2043 | ||
e316aad5 DG |
2044 | /* Just don't waste time if no returned events for the fd */ |
2045 | if (!revents) { | |
2046 | continue; | |
2047 | } | |
2048 | ||
fb3a43a9 | 2049 | if (pollfd == ctx->consumer_metadata_pipe[0]) { |
4adabd61 | 2050 | if (revents & (LPOLLERR | LPOLLHUP )) { |
fb3a43a9 DG |
2051 | DBG("Metadata thread pipe hung up"); |
2052 | /* | |
2053 | * Remove the pipe from the poll set and continue the loop | |
2054 | * since their might be data to consume. | |
2055 | */ | |
2056 | lttng_poll_del(&events, ctx->consumer_metadata_pipe[0]); | |
2057 | close(ctx->consumer_metadata_pipe[0]); | |
2058 | continue; | |
2059 | } else if (revents & LPOLLIN) { | |
fb3a43a9 | 2060 | do { |
633d0084 DG |
2061 | /* Get the stream pointer received */ |
2062 | ret = read(pollfd, &stream, sizeof(stream)); | |
fb3a43a9 | 2063 | } while (ret < 0 && errno == EINTR); |
633d0084 DG |
2064 | if (ret < 0 || |
2065 | ret < sizeof(struct lttng_consumer_stream *)) { | |
fb3a43a9 | 2066 | PERROR("read metadata stream"); |
fb3a43a9 DG |
2067 | /* |
2068 | * Let's continue here and hope we can still work | |
2069 | * without stopping the consumer. XXX: Should we? | |
2070 | */ | |
2071 | continue; | |
2072 | } | |
2073 | ||
8994307f DG |
2074 | /* A NULL stream means that the state has changed. */ |
2075 | if (stream == NULL) { | |
2076 | /* Check for deleted streams. */ | |
2077 | validate_endpoint_status_metadata_stream(&events); | |
2078 | continue; | |
2079 | } | |
2080 | ||
fb3a43a9 DG |
2081 | DBG("Adding metadata stream %d to poll set", |
2082 | stream->wait_fd); | |
2083 | ||
e316aad5 DG |
2084 | ret = consumer_add_metadata_stream(stream, metadata_ht); |
2085 | if (ret) { | |
2086 | ERR("Unable to add metadata stream"); | |
2087 | /* Stream was not setup properly. Continuing. */ | |
2088 | consumer_del_metadata_stream(stream, NULL); | |
2089 | continue; | |
2090 | } | |
fb3a43a9 DG |
2091 | |
2092 | /* Add metadata stream to the global poll events list */ | |
2093 | lttng_poll_add(&events, stream->wait_fd, | |
2094 | LPOLLIN | LPOLLPRI); | |
fb3a43a9 DG |
2095 | } |
2096 | ||
e316aad5 | 2097 | /* Handle other stream */ |
fb3a43a9 DG |
2098 | continue; |
2099 | } | |
2100 | ||
d09e1200 | 2101 | rcu_read_lock(); |
fb3a43a9 DG |
2102 | lttng_ht_lookup(metadata_ht, (void *)((unsigned long) pollfd), |
2103 | &iter); | |
2104 | node = lttng_ht_iter_get_node_ulong(&iter); | |
e316aad5 | 2105 | assert(node); |
fb3a43a9 DG |
2106 | |
2107 | stream = caa_container_of(node, struct lttng_consumer_stream, | |
58b1f425 | 2108 | node); |
fb3a43a9 | 2109 | |
e316aad5 | 2110 | /* Check for error event */ |
4adabd61 | 2111 | if (revents & (LPOLLERR | LPOLLHUP)) { |
e316aad5 | 2112 | DBG("Metadata fd %d is hup|err.", pollfd); |
fb3a43a9 DG |
2113 | if (!stream->hangup_flush_done |
2114 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
2115 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
2116 | DBG("Attempting to flush and consume the UST buffers"); | |
2117 | lttng_ustconsumer_on_stream_hangup(stream); | |
2118 | ||
2119 | /* We just flushed the stream now read it. */ | |
4bb94b75 DG |
2120 | do { |
2121 | len = ctx->on_buffer_ready(stream, ctx); | |
2122 | /* | |
2123 | * We don't check the return value here since if we get | |
2124 | * a negative len, it means an error occured thus we | |
2125 | * simply remove it from the poll set and free the | |
2126 | * stream. | |
2127 | */ | |
2128 | } while (len > 0); | |
fb3a43a9 DG |
2129 | } |
2130 | ||
fb3a43a9 | 2131 | lttng_poll_del(&events, stream->wait_fd); |
e316aad5 DG |
2132 | /* |
2133 | * This call update the channel states, closes file descriptors | |
2134 | * and securely free the stream. | |
2135 | */ | |
2136 | consumer_del_metadata_stream(stream, metadata_ht); | |
2137 | } else if (revents & (LPOLLIN | LPOLLPRI)) { | |
2138 | /* Get the data out of the metadata file descriptor */ | |
2139 | DBG("Metadata available on fd %d", pollfd); | |
2140 | assert(stream->wait_fd == pollfd); | |
2141 | ||
2142 | len = ctx->on_buffer_ready(stream, ctx); | |
2143 | /* It's ok to have an unavailable sub-buffer */ | |
b64403e3 | 2144 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2145 | /* Clean up stream from consumer and free it. */ |
2146 | lttng_poll_del(&events, stream->wait_fd); | |
2147 | consumer_del_metadata_stream(stream, metadata_ht); | |
e316aad5 DG |
2148 | } else if (len > 0) { |
2149 | stream->data_read = 1; | |
2150 | } | |
fb3a43a9 | 2151 | } |
e316aad5 DG |
2152 | |
2153 | /* Release RCU lock for the stream looked up */ | |
d09e1200 | 2154 | rcu_read_unlock(); |
fb3a43a9 DG |
2155 | } |
2156 | } | |
2157 | ||
2158 | error: | |
2159 | end: | |
2160 | DBG("Metadata poll thread exiting"); | |
2161 | lttng_poll_clean(&events); | |
2162 | ||
2163 | if (metadata_ht) { | |
2164 | destroy_stream_ht(metadata_ht); | |
2165 | } | |
2166 | ||
2167 | rcu_unregister_thread(); | |
2168 | return NULL; | |
2169 | } | |
2170 | ||
3bd1e081 | 2171 | /* |
e4421fec | 2172 | * This thread polls the fds in the set to consume the data and write |
3bd1e081 MD |
2173 | * it to tracefile if necessary. |
2174 | */ | |
7d980def | 2175 | void *consumer_thread_data_poll(void *data) |
3bd1e081 MD |
2176 | { |
2177 | int num_rdy, num_hup, high_prio, ret, i; | |
2178 | struct pollfd *pollfd = NULL; | |
2179 | /* local view of the streams */ | |
c869f647 | 2180 | struct lttng_consumer_stream **local_stream = NULL, *new_stream = NULL; |
3bd1e081 MD |
2181 | /* local view of consumer_data.fds_count */ |
2182 | int nb_fd = 0; | |
3bd1e081 | 2183 | struct lttng_consumer_local_data *ctx = data; |
00e2e675 | 2184 | ssize_t len; |
3bd1e081 | 2185 | |
e7b994a3 DG |
2186 | rcu_register_thread(); |
2187 | ||
43c34bc3 DG |
2188 | data_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2189 | if (data_ht == NULL) { | |
2190 | goto end; | |
2191 | } | |
2192 | ||
effcf122 | 2193 | local_stream = zmalloc(sizeof(struct lttng_consumer_stream)); |
3bd1e081 MD |
2194 | |
2195 | while (1) { | |
2196 | high_prio = 0; | |
2197 | num_hup = 0; | |
2198 | ||
2199 | /* | |
e4421fec | 2200 | * the fds set has been updated, we need to update our |
3bd1e081 MD |
2201 | * local array as well |
2202 | */ | |
2203 | pthread_mutex_lock(&consumer_data.lock); | |
2204 | if (consumer_data.need_update) { | |
2205 | if (pollfd != NULL) { | |
2206 | free(pollfd); | |
2207 | pollfd = NULL; | |
2208 | } | |
2209 | if (local_stream != NULL) { | |
2210 | free(local_stream); | |
2211 | local_stream = NULL; | |
2212 | } | |
2213 | ||
50f8ae69 | 2214 | /* allocate for all fds + 1 for the consumer_data_pipe */ |
effcf122 | 2215 | pollfd = zmalloc((consumer_data.stream_count + 1) * sizeof(struct pollfd)); |
3bd1e081 | 2216 | if (pollfd == NULL) { |
7a57cf92 | 2217 | PERROR("pollfd malloc"); |
3bd1e081 MD |
2218 | pthread_mutex_unlock(&consumer_data.lock); |
2219 | goto end; | |
2220 | } | |
2221 | ||
50f8ae69 | 2222 | /* allocate for all fds + 1 for the consumer_data_pipe */ |
effcf122 | 2223 | local_stream = zmalloc((consumer_data.stream_count + 1) * |
3bd1e081 MD |
2224 | sizeof(struct lttng_consumer_stream)); |
2225 | if (local_stream == NULL) { | |
7a57cf92 | 2226 | PERROR("local_stream malloc"); |
3bd1e081 MD |
2227 | pthread_mutex_unlock(&consumer_data.lock); |
2228 | goto end; | |
2229 | } | |
43c34bc3 DG |
2230 | ret = consumer_update_poll_array(ctx, &pollfd, local_stream, |
2231 | data_ht); | |
3bd1e081 MD |
2232 | if (ret < 0) { |
2233 | ERR("Error in allocating pollfd or local_outfds"); | |
f73fabfd | 2234 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
2235 | pthread_mutex_unlock(&consumer_data.lock); |
2236 | goto end; | |
2237 | } | |
2238 | nb_fd = ret; | |
2239 | consumer_data.need_update = 0; | |
2240 | } | |
2241 | pthread_mutex_unlock(&consumer_data.lock); | |
2242 | ||
4078b776 MD |
2243 | /* No FDs and consumer_quit, consumer_cleanup the thread */ |
2244 | if (nb_fd == 0 && consumer_quit == 1) { | |
2245 | goto end; | |
2246 | } | |
3bd1e081 | 2247 | /* poll on the array of fds */ |
88f2b785 | 2248 | restart: |
3bd1e081 | 2249 | DBG("polling on %d fd", nb_fd + 1); |
cb365c03 | 2250 | num_rdy = poll(pollfd, nb_fd + 1, -1); |
3bd1e081 MD |
2251 | DBG("poll num_rdy : %d", num_rdy); |
2252 | if (num_rdy == -1) { | |
88f2b785 MD |
2253 | /* |
2254 | * Restart interrupted system call. | |
2255 | */ | |
2256 | if (errno == EINTR) { | |
2257 | goto restart; | |
2258 | } | |
7a57cf92 | 2259 | PERROR("Poll error"); |
f73fabfd | 2260 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
2261 | goto end; |
2262 | } else if (num_rdy == 0) { | |
2263 | DBG("Polling thread timed out"); | |
2264 | goto end; | |
2265 | } | |
2266 | ||
3bd1e081 | 2267 | /* |
50f8ae69 | 2268 | * If the consumer_data_pipe triggered poll go directly to the |
00e2e675 DG |
2269 | * beginning of the loop to update the array. We want to prioritize |
2270 | * array update over low-priority reads. | |
3bd1e081 | 2271 | */ |
509bb1cf | 2272 | if (pollfd[nb_fd].revents & (POLLIN | POLLPRI)) { |
04fdd819 | 2273 | size_t pipe_readlen; |
04fdd819 | 2274 | |
50f8ae69 | 2275 | DBG("consumer_data_pipe wake up"); |
04fdd819 MD |
2276 | /* Consume 1 byte of pipe data */ |
2277 | do { | |
50f8ae69 | 2278 | pipe_readlen = read(ctx->consumer_data_pipe[0], &new_stream, |
c869f647 | 2279 | sizeof(new_stream)); |
04fdd819 | 2280 | } while (pipe_readlen == -1 && errno == EINTR); |
c869f647 DG |
2281 | |
2282 | /* | |
2283 | * If the stream is NULL, just ignore it. It's also possible that | |
2284 | * the sessiond poll thread changed the consumer_quit state and is | |
2285 | * waking us up to test it. | |
2286 | */ | |
2287 | if (new_stream == NULL) { | |
8994307f | 2288 | validate_endpoint_status_data_stream(); |
c869f647 DG |
2289 | continue; |
2290 | } | |
2291 | ||
43c34bc3 | 2292 | ret = consumer_add_stream(new_stream, data_ht); |
c869f647 DG |
2293 | if (ret) { |
2294 | ERR("Consumer add stream %d failed. Continuing", | |
2295 | new_stream->key); | |
2296 | /* | |
2297 | * At this point, if the add_stream fails, it is not in the | |
2298 | * hash table thus passing the NULL value here. | |
2299 | */ | |
2300 | consumer_del_stream(new_stream, NULL); | |
2301 | } | |
2302 | ||
2303 | /* Continue to update the local streams and handle prio ones */ | |
3bd1e081 MD |
2304 | continue; |
2305 | } | |
2306 | ||
2307 | /* Take care of high priority channels first. */ | |
2308 | for (i = 0; i < nb_fd; i++) { | |
9617607b DG |
2309 | if (local_stream[i] == NULL) { |
2310 | continue; | |
2311 | } | |
fb3a43a9 | 2312 | if (pollfd[i].revents & POLLPRI) { |
d41f73b7 MD |
2313 | DBG("Urgent read on fd %d", pollfd[i].fd); |
2314 | high_prio = 1; | |
4078b776 | 2315 | len = ctx->on_buffer_ready(local_stream[i], ctx); |
d41f73b7 | 2316 | /* it's ok to have an unavailable sub-buffer */ |
b64403e3 | 2317 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2318 | /* Clean the stream and free it. */ |
2319 | consumer_del_stream(local_stream[i], data_ht); | |
9617607b | 2320 | local_stream[i] = NULL; |
4078b776 MD |
2321 | } else if (len > 0) { |
2322 | local_stream[i]->data_read = 1; | |
d41f73b7 | 2323 | } |
3bd1e081 MD |
2324 | } |
2325 | } | |
2326 | ||
4078b776 MD |
2327 | /* |
2328 | * If we read high prio channel in this loop, try again | |
2329 | * for more high prio data. | |
2330 | */ | |
2331 | if (high_prio) { | |
3bd1e081 MD |
2332 | continue; |
2333 | } | |
2334 | ||
2335 | /* Take care of low priority channels. */ | |
4078b776 | 2336 | for (i = 0; i < nb_fd; i++) { |
9617607b DG |
2337 | if (local_stream[i] == NULL) { |
2338 | continue; | |
2339 | } | |
4078b776 MD |
2340 | if ((pollfd[i].revents & POLLIN) || |
2341 | local_stream[i]->hangup_flush_done) { | |
4078b776 MD |
2342 | DBG("Normal read on fd %d", pollfd[i].fd); |
2343 | len = ctx->on_buffer_ready(local_stream[i], ctx); | |
2344 | /* it's ok to have an unavailable sub-buffer */ | |
b64403e3 | 2345 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2346 | /* Clean the stream and free it. */ |
2347 | consumer_del_stream(local_stream[i], data_ht); | |
9617607b | 2348 | local_stream[i] = NULL; |
4078b776 MD |
2349 | } else if (len > 0) { |
2350 | local_stream[i]->data_read = 1; | |
2351 | } | |
2352 | } | |
2353 | } | |
2354 | ||
2355 | /* Handle hangup and errors */ | |
2356 | for (i = 0; i < nb_fd; i++) { | |
9617607b DG |
2357 | if (local_stream[i] == NULL) { |
2358 | continue; | |
2359 | } | |
4078b776 MD |
2360 | if (!local_stream[i]->hangup_flush_done |
2361 | && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL)) | |
2362 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
2363 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
2364 | DBG("fd %d is hup|err|nval. Attempting flush and read.", | |
9617607b | 2365 | pollfd[i].fd); |
4078b776 MD |
2366 | lttng_ustconsumer_on_stream_hangup(local_stream[i]); |
2367 | /* Attempt read again, for the data we just flushed. */ | |
2368 | local_stream[i]->data_read = 1; | |
2369 | } | |
2370 | /* | |
2371 | * If the poll flag is HUP/ERR/NVAL and we have | |
2372 | * read no data in this pass, we can remove the | |
2373 | * stream from its hash table. | |
2374 | */ | |
2375 | if ((pollfd[i].revents & POLLHUP)) { | |
2376 | DBG("Polling fd %d tells it has hung up.", pollfd[i].fd); | |
2377 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2378 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2379 | local_stream[i] = NULL; |
4078b776 MD |
2380 | num_hup++; |
2381 | } | |
2382 | } else if (pollfd[i].revents & POLLERR) { | |
2383 | ERR("Error returned in polling fd %d.", pollfd[i].fd); | |
2384 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2385 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2386 | local_stream[i] = NULL; |
4078b776 MD |
2387 | num_hup++; |
2388 | } | |
2389 | } else if (pollfd[i].revents & POLLNVAL) { | |
2390 | ERR("Polling fd %d tells fd is not open.", pollfd[i].fd); | |
2391 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2392 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2393 | local_stream[i] = NULL; |
4078b776 | 2394 | num_hup++; |
3bd1e081 MD |
2395 | } |
2396 | } | |
9617607b DG |
2397 | if (local_stream[i] != NULL) { |
2398 | local_stream[i]->data_read = 0; | |
2399 | } | |
3bd1e081 MD |
2400 | } |
2401 | } | |
2402 | end: | |
2403 | DBG("polling thread exiting"); | |
2404 | if (pollfd != NULL) { | |
2405 | free(pollfd); | |
2406 | pollfd = NULL; | |
2407 | } | |
2408 | if (local_stream != NULL) { | |
2409 | free(local_stream); | |
2410 | local_stream = NULL; | |
2411 | } | |
fb3a43a9 DG |
2412 | |
2413 | /* | |
2414 | * Close the write side of the pipe so epoll_wait() in | |
7d980def DG |
2415 | * consumer_thread_metadata_poll can catch it. The thread is monitoring the |
2416 | * read side of the pipe. If we close them both, epoll_wait strangely does | |
2417 | * not return and could create a endless wait period if the pipe is the | |
2418 | * only tracked fd in the poll set. The thread will take care of closing | |
2419 | * the read side. | |
fb3a43a9 DG |
2420 | */ |
2421 | close(ctx->consumer_metadata_pipe[1]); | |
fb3a43a9 | 2422 | |
43c34bc3 DG |
2423 | if (data_ht) { |
2424 | destroy_data_stream_ht(data_ht); | |
2425 | } | |
2426 | ||
e7b994a3 | 2427 | rcu_unregister_thread(); |
3bd1e081 MD |
2428 | return NULL; |
2429 | } | |
2430 | ||
2431 | /* | |
2432 | * This thread listens on the consumerd socket and receives the file | |
2433 | * descriptors from the session daemon. | |
2434 | */ | |
7d980def | 2435 | void *consumer_thread_sessiond_poll(void *data) |
3bd1e081 MD |
2436 | { |
2437 | int sock, client_socket, ret; | |
2438 | /* | |
2439 | * structure to poll for incoming data on communication socket avoids | |
2440 | * making blocking sockets. | |
2441 | */ | |
2442 | struct pollfd consumer_sockpoll[2]; | |
2443 | struct lttng_consumer_local_data *ctx = data; | |
2444 | ||
e7b994a3 DG |
2445 | rcu_register_thread(); |
2446 | ||
3bd1e081 MD |
2447 | DBG("Creating command socket %s", ctx->consumer_command_sock_path); |
2448 | unlink(ctx->consumer_command_sock_path); | |
2449 | client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path); | |
2450 | if (client_socket < 0) { | |
2451 | ERR("Cannot create command socket"); | |
2452 | goto end; | |
2453 | } | |
2454 | ||
2455 | ret = lttcomm_listen_unix_sock(client_socket); | |
2456 | if (ret < 0) { | |
2457 | goto end; | |
2458 | } | |
2459 | ||
32258573 | 2460 | DBG("Sending ready command to lttng-sessiond"); |
f73fabfd | 2461 | ret = lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_COMMAND_SOCK_READY); |
3bd1e081 MD |
2462 | /* return < 0 on error, but == 0 is not fatal */ |
2463 | if (ret < 0) { | |
32258573 | 2464 | ERR("Error sending ready command to lttng-sessiond"); |
3bd1e081 MD |
2465 | goto end; |
2466 | } | |
2467 | ||
2468 | ret = fcntl(client_socket, F_SETFL, O_NONBLOCK); | |
2469 | if (ret < 0) { | |
7a57cf92 | 2470 | PERROR("fcntl O_NONBLOCK"); |
3bd1e081 MD |
2471 | goto end; |
2472 | } | |
2473 | ||
2474 | /* prepare the FDs to poll : to client socket and the should_quit pipe */ | |
2475 | consumer_sockpoll[0].fd = ctx->consumer_should_quit[0]; | |
2476 | consumer_sockpoll[0].events = POLLIN | POLLPRI; | |
2477 | consumer_sockpoll[1].fd = client_socket; | |
2478 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
2479 | ||
2480 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2481 | goto end; | |
2482 | } | |
2483 | DBG("Connection on client_socket"); | |
2484 | ||
2485 | /* Blocking call, waiting for transmission */ | |
2486 | sock = lttcomm_accept_unix_sock(client_socket); | |
2487 | if (sock <= 0) { | |
2488 | WARN("On accept"); | |
2489 | goto end; | |
2490 | } | |
2491 | ret = fcntl(sock, F_SETFL, O_NONBLOCK); | |
2492 | if (ret < 0) { | |
7a57cf92 | 2493 | PERROR("fcntl O_NONBLOCK"); |
3bd1e081 MD |
2494 | goto end; |
2495 | } | |
2496 | ||
2497 | /* update the polling structure to poll on the established socket */ | |
2498 | consumer_sockpoll[1].fd = sock; | |
2499 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
2500 | ||
2501 | while (1) { | |
2502 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2503 | goto end; | |
2504 | } | |
2505 | DBG("Incoming command on sock"); | |
2506 | ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
2507 | if (ret == -ENOENT) { | |
2508 | DBG("Received STOP command"); | |
2509 | goto end; | |
2510 | } | |
4cbc1a04 DG |
2511 | if (ret <= 0) { |
2512 | /* | |
2513 | * This could simply be a session daemon quitting. Don't output | |
2514 | * ERR() here. | |
2515 | */ | |
2516 | DBG("Communication interrupted on command socket"); | |
3bd1e081 MD |
2517 | goto end; |
2518 | } | |
2519 | if (consumer_quit) { | |
2520 | DBG("consumer_thread_receive_fds received quit from signal"); | |
2521 | goto end; | |
2522 | } | |
2523 | DBG("received fds on sock"); | |
2524 | } | |
2525 | end: | |
2526 | DBG("consumer_thread_receive_fds exiting"); | |
2527 | ||
2528 | /* | |
2529 | * when all fds have hung up, the polling thread | |
2530 | * can exit cleanly | |
2531 | */ | |
2532 | consumer_quit = 1; | |
2533 | ||
04fdd819 | 2534 | /* |
c869f647 | 2535 | * Notify the data poll thread to poll back again and test the |
8994307f | 2536 | * consumer_quit state that we just set so to quit gracefully. |
04fdd819 | 2537 | */ |
8994307f | 2538 | notify_thread_pipe(ctx->consumer_data_pipe[1]); |
c869f647 | 2539 | |
e7b994a3 | 2540 | rcu_unregister_thread(); |
3bd1e081 MD |
2541 | return NULL; |
2542 | } | |
d41f73b7 | 2543 | |
4078b776 | 2544 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
2545 | struct lttng_consumer_local_data *ctx) |
2546 | { | |
2547 | switch (consumer_data.type) { | |
2548 | case LTTNG_CONSUMER_KERNEL: | |
2549 | return lttng_kconsumer_read_subbuffer(stream, ctx); | |
7753dea8 MD |
2550 | case LTTNG_CONSUMER32_UST: |
2551 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
2552 | return lttng_ustconsumer_read_subbuffer(stream, ctx); |
2553 | default: | |
2554 | ERR("Unknown consumer_data type"); | |
2555 | assert(0); | |
2556 | return -ENOSYS; | |
2557 | } | |
2558 | } | |
2559 | ||
2560 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
2561 | { | |
2562 | switch (consumer_data.type) { | |
2563 | case LTTNG_CONSUMER_KERNEL: | |
2564 | return lttng_kconsumer_on_recv_stream(stream); | |
7753dea8 MD |
2565 | case LTTNG_CONSUMER32_UST: |
2566 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
2567 | return lttng_ustconsumer_on_recv_stream(stream); |
2568 | default: | |
2569 | ERR("Unknown consumer_data type"); | |
2570 | assert(0); | |
2571 | return -ENOSYS; | |
2572 | } | |
2573 | } | |
e4421fec DG |
2574 | |
2575 | /* | |
2576 | * Allocate and set consumer data hash tables. | |
2577 | */ | |
2578 | void lttng_consumer_init(void) | |
2579 | { | |
e4421fec | 2580 | consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
00e2e675 | 2581 | consumer_data.relayd_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
53632229 | 2582 | consumer_data.stream_list_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
43c34bc3 DG |
2583 | |
2584 | metadata_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
2585 | assert(metadata_ht); | |
2586 | data_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
2587 | assert(data_ht); | |
e4421fec | 2588 | } |
7735ef9e DG |
2589 | |
2590 | /* | |
2591 | * Process the ADD_RELAYD command receive by a consumer. | |
2592 | * | |
2593 | * This will create a relayd socket pair and add it to the relayd hash table. | |
2594 | * The caller MUST acquire a RCU read side lock before calling it. | |
2595 | */ | |
2596 | int consumer_add_relayd_socket(int net_seq_idx, int sock_type, | |
2597 | struct lttng_consumer_local_data *ctx, int sock, | |
2598 | struct pollfd *consumer_sockpoll, struct lttcomm_sock *relayd_sock) | |
2599 | { | |
2600 | int fd, ret = -1; | |
2601 | struct consumer_relayd_sock_pair *relayd; | |
2602 | ||
2603 | DBG("Consumer adding relayd socket (idx: %d)", net_seq_idx); | |
2604 | ||
2605 | /* Get relayd reference if exists. */ | |
2606 | relayd = consumer_find_relayd(net_seq_idx); | |
2607 | if (relayd == NULL) { | |
2608 | /* Not found. Allocate one. */ | |
2609 | relayd = consumer_allocate_relayd_sock_pair(net_seq_idx); | |
2610 | if (relayd == NULL) { | |
f73fabfd | 2611 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
7735ef9e DG |
2612 | goto error; |
2613 | } | |
2614 | } | |
2615 | ||
2616 | /* Poll on consumer socket. */ | |
2617 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2618 | ret = -EINTR; | |
2619 | goto error; | |
2620 | } | |
2621 | ||
2622 | /* Get relayd socket from session daemon */ | |
2623 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); | |
2624 | if (ret != sizeof(fd)) { | |
f73fabfd | 2625 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
7735ef9e DG |
2626 | ret = -1; |
2627 | goto error; | |
2628 | } | |
2629 | ||
2630 | /* Copy socket information and received FD */ | |
2631 | switch (sock_type) { | |
2632 | case LTTNG_STREAM_CONTROL: | |
2633 | /* Copy received lttcomm socket */ | |
2634 | lttcomm_copy_sock(&relayd->control_sock, relayd_sock); | |
2635 | ret = lttcomm_create_sock(&relayd->control_sock); | |
2636 | if (ret < 0) { | |
2637 | goto error; | |
2638 | } | |
2639 | ||
2640 | /* Close the created socket fd which is useless */ | |
2641 | close(relayd->control_sock.fd); | |
2642 | ||
2643 | /* Assign new file descriptor */ | |
2644 | relayd->control_sock.fd = fd; | |
2645 | break; | |
2646 | case LTTNG_STREAM_DATA: | |
2647 | /* Copy received lttcomm socket */ | |
2648 | lttcomm_copy_sock(&relayd->data_sock, relayd_sock); | |
2649 | ret = lttcomm_create_sock(&relayd->data_sock); | |
2650 | if (ret < 0) { | |
2651 | goto error; | |
2652 | } | |
2653 | ||
2654 | /* Close the created socket fd which is useless */ | |
2655 | close(relayd->data_sock.fd); | |
2656 | ||
2657 | /* Assign new file descriptor */ | |
2658 | relayd->data_sock.fd = fd; | |
2659 | break; | |
2660 | default: | |
2661 | ERR("Unknown relayd socket type (%d)", sock_type); | |
2662 | goto error; | |
2663 | } | |
2664 | ||
2665 | DBG("Consumer %s socket created successfully with net idx %d (fd: %d)", | |
2666 | sock_type == LTTNG_STREAM_CONTROL ? "control" : "data", | |
2667 | relayd->net_seq_idx, fd); | |
2668 | ||
2669 | /* | |
2670 | * Add relayd socket pair to consumer data hashtable. If object already | |
2671 | * exists or on error, the function gracefully returns. | |
2672 | */ | |
d09e1200 | 2673 | add_relayd(relayd); |
7735ef9e DG |
2674 | |
2675 | /* All good! */ | |
2676 | ret = 0; | |
2677 | ||
2678 | error: | |
2679 | return ret; | |
2680 | } | |
ca22feea | 2681 | |
4e9a4686 DG |
2682 | /* |
2683 | * Try to lock the stream mutex. | |
2684 | * | |
2685 | * On success, 1 is returned else 0 indicating that the mutex is NOT lock. | |
2686 | */ | |
2687 | static int stream_try_lock(struct lttng_consumer_stream *stream) | |
2688 | { | |
2689 | int ret; | |
2690 | ||
2691 | assert(stream); | |
2692 | ||
2693 | /* | |
2694 | * Try to lock the stream mutex. On failure, we know that the stream is | |
2695 | * being used else where hence there is data still being extracted. | |
2696 | */ | |
2697 | ret = pthread_mutex_trylock(&stream->lock); | |
2698 | if (ret) { | |
2699 | /* For both EBUSY and EINVAL error, the mutex is NOT locked. */ | |
2700 | ret = 0; | |
2701 | goto end; | |
2702 | } | |
2703 | ||
2704 | ret = 1; | |
2705 | ||
2706 | end: | |
2707 | return ret; | |
2708 | } | |
2709 | ||
ca22feea DG |
2710 | /* |
2711 | * Check if for a given session id there is still data needed to be extract | |
2712 | * from the buffers. | |
2713 | * | |
6d805429 | 2714 | * Return 1 if data is pending or else 0 meaning ready to be read. |
ca22feea | 2715 | */ |
6d805429 | 2716 | int consumer_data_pending(uint64_t id) |
ca22feea DG |
2717 | { |
2718 | int ret; | |
2719 | struct lttng_ht_iter iter; | |
2720 | struct lttng_ht *ht; | |
2721 | struct lttng_consumer_stream *stream; | |
c8f59ee5 | 2722 | struct consumer_relayd_sock_pair *relayd; |
6d805429 | 2723 | int (*data_pending)(struct lttng_consumer_stream *); |
ca22feea | 2724 | |
6d805429 | 2725 | DBG("Consumer data pending command on session id %" PRIu64, id); |
ca22feea | 2726 | |
6f6eda74 | 2727 | rcu_read_lock(); |
ca22feea DG |
2728 | pthread_mutex_lock(&consumer_data.lock); |
2729 | ||
2730 | switch (consumer_data.type) { | |
2731 | case LTTNG_CONSUMER_KERNEL: | |
6d805429 | 2732 | data_pending = lttng_kconsumer_data_pending; |
ca22feea DG |
2733 | break; |
2734 | case LTTNG_CONSUMER32_UST: | |
2735 | case LTTNG_CONSUMER64_UST: | |
6d805429 | 2736 | data_pending = lttng_ustconsumer_data_pending; |
ca22feea DG |
2737 | break; |
2738 | default: | |
2739 | ERR("Unknown consumer data type"); | |
2740 | assert(0); | |
2741 | } | |
2742 | ||
2743 | /* Ease our life a bit */ | |
2744 | ht = consumer_data.stream_list_ht; | |
2745 | ||
c8f59ee5 | 2746 | cds_lfht_for_each_entry_duplicate(ht->ht, |
b6314938 | 2747 | ht->hash_fct((void *)((unsigned long) id), lttng_ht_seed), |
ca22feea DG |
2748 | ht->match_fct, (void *)((unsigned long) id), |
2749 | &iter.iter, stream, node_session_id.node) { | |
4e9a4686 DG |
2750 | /* If this call fails, the stream is being used hence data pending. */ |
2751 | ret = stream_try_lock(stream); | |
2752 | if (!ret) { | |
6d805429 | 2753 | goto data_not_pending; |
ca22feea | 2754 | } |
ca22feea | 2755 | |
4e9a4686 DG |
2756 | /* |
2757 | * A removed node from the hash table indicates that the stream has | |
2758 | * been deleted thus having a guarantee that the buffers are closed | |
2759 | * on the consumer side. However, data can still be transmitted | |
2760 | * over the network so don't skip the relayd check. | |
2761 | */ | |
2762 | ret = cds_lfht_is_node_deleted(&stream->node.node); | |
2763 | if (!ret) { | |
2764 | /* Check the stream if there is data in the buffers. */ | |
6d805429 DG |
2765 | ret = data_pending(stream); |
2766 | if (ret == 1) { | |
4e9a4686 | 2767 | pthread_mutex_unlock(&stream->lock); |
6d805429 | 2768 | goto data_not_pending; |
4e9a4686 DG |
2769 | } |
2770 | } | |
2771 | ||
2772 | /* Relayd check */ | |
c8f59ee5 DG |
2773 | if (stream->net_seq_idx != -1) { |
2774 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
4e9a4686 DG |
2775 | if (!relayd) { |
2776 | /* | |
2777 | * At this point, if the relayd object is not available for the | |
2778 | * given stream, it is because the relayd is being cleaned up | |
2779 | * so every stream associated with it (for a session id value) | |
2780 | * are or will be marked for deletion hence no data pending. | |
2781 | */ | |
2782 | pthread_mutex_unlock(&stream->lock); | |
6d805429 | 2783 | goto data_not_pending; |
4e9a4686 | 2784 | } |
c8f59ee5 | 2785 | |
c8f59ee5 DG |
2786 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); |
2787 | if (stream->metadata_flag) { | |
2788 | ret = relayd_quiescent_control(&relayd->control_sock); | |
2789 | } else { | |
6d805429 | 2790 | ret = relayd_data_pending(&relayd->control_sock, |
c8f59ee5 DG |
2791 | stream->relayd_stream_id, stream->next_net_seq_num); |
2792 | } | |
2793 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
6d805429 | 2794 | if (ret == 1) { |
4e9a4686 | 2795 | pthread_mutex_unlock(&stream->lock); |
6d805429 | 2796 | goto data_not_pending; |
c8f59ee5 DG |
2797 | } |
2798 | } | |
4e9a4686 | 2799 | pthread_mutex_unlock(&stream->lock); |
c8f59ee5 | 2800 | } |
ca22feea DG |
2801 | |
2802 | /* | |
2803 | * Finding _no_ node in the hash table means that the stream(s) have been | |
2804 | * removed thus data is guaranteed to be available for analysis from the | |
2805 | * trace files. This is *only* true for local consumer and not network | |
2806 | * streaming. | |
2807 | */ | |
2808 | ||
2809 | /* Data is available to be read by a viewer. */ | |
2810 | pthread_mutex_unlock(&consumer_data.lock); | |
c8f59ee5 | 2811 | rcu_read_unlock(); |
6d805429 | 2812 | return 0; |
ca22feea | 2813 | |
6d805429 | 2814 | data_not_pending: |
ca22feea DG |
2815 | /* Data is still being extracted from buffers. */ |
2816 | pthread_mutex_unlock(&consumer_data.lock); | |
c8f59ee5 | 2817 | rcu_read_unlock(); |
6d805429 | 2818 | return 1; |
ca22feea | 2819 | } |