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 | 58 | /* |
43c34bc3 DG |
59 | * Global hash table containing respectively metadata and data streams. The |
60 | * stream element in this ht should only be updated by the metadata poll thread | |
61 | * for the metadata and the data poll thread for the data. | |
62 | */ | |
40dc48e0 DG |
63 | static struct lttng_ht *metadata_ht; |
64 | static struct lttng_ht *data_ht; | |
43c34bc3 | 65 | |
46e6455f DG |
66 | /* |
67 | * This hash table contains the mapping between the session id of the sessiond | |
f7079f67 DG |
68 | * and the relayd session id. Element of the ht are indexed by sessiond session |
69 | * id. | |
46e6455f DG |
70 | * |
71 | * Node can be added when a relayd communication is opened in the sessiond | |
72 | * thread. | |
73 | * | |
74 | * Note that a session id of the session daemon is unique to a tracing session | |
75 | * and not to a domain session. However, a domain session has one consumer | |
76 | * which forces the 1-1 mapping between a consumer and a domain session (ex: | |
77 | * UST). This means that we can't have duplicate in this ht. | |
78 | */ | |
79 | static struct lttng_ht *relayd_session_id_ht; | |
80 | ||
8994307f DG |
81 | /* |
82 | * Notify a thread pipe to poll back again. This usually means that some global | |
83 | * state has changed so we just send back the thread in a poll wait call. | |
84 | */ | |
85 | static void notify_thread_pipe(int wpipe) | |
86 | { | |
87 | int ret; | |
88 | ||
89 | do { | |
90 | struct lttng_consumer_stream *null_stream = NULL; | |
91 | ||
92 | ret = write(wpipe, &null_stream, sizeof(null_stream)); | |
93 | } while (ret < 0 && errno == EINTR); | |
94 | } | |
95 | ||
3bd1e081 MD |
96 | /* |
97 | * Find a stream. The consumer_data.lock must be locked during this | |
98 | * call. | |
99 | */ | |
8389e4f8 DG |
100 | static struct lttng_consumer_stream *consumer_find_stream(int key, |
101 | struct lttng_ht *ht) | |
3bd1e081 | 102 | { |
e4421fec DG |
103 | struct lttng_ht_iter iter; |
104 | struct lttng_ht_node_ulong *node; | |
105 | struct lttng_consumer_stream *stream = NULL; | |
3bd1e081 | 106 | |
8389e4f8 DG |
107 | assert(ht); |
108 | ||
7ad0a0cb | 109 | /* Negative keys are lookup failures */ |
7a57cf92 | 110 | if (key < 0) { |
7ad0a0cb | 111 | return NULL; |
7a57cf92 | 112 | } |
e4421fec | 113 | |
6065ceec DG |
114 | rcu_read_lock(); |
115 | ||
8389e4f8 | 116 | lttng_ht_lookup(ht, (void *)((unsigned long) key), &iter); |
e4421fec DG |
117 | node = lttng_ht_iter_get_node_ulong(&iter); |
118 | if (node != NULL) { | |
119 | stream = caa_container_of(node, struct lttng_consumer_stream, node); | |
3bd1e081 | 120 | } |
e4421fec | 121 | |
6065ceec DG |
122 | rcu_read_unlock(); |
123 | ||
e4421fec | 124 | return stream; |
3bd1e081 MD |
125 | } |
126 | ||
c869f647 | 127 | void consumer_steal_stream_key(int key, struct lttng_ht *ht) |
7ad0a0cb MD |
128 | { |
129 | struct lttng_consumer_stream *stream; | |
130 | ||
04253271 | 131 | rcu_read_lock(); |
8389e4f8 | 132 | stream = consumer_find_stream(key, ht); |
04253271 | 133 | if (stream) { |
7ad0a0cb | 134 | stream->key = -1; |
04253271 MD |
135 | /* |
136 | * We don't want the lookup to match, but we still need | |
137 | * to iterate on this stream when iterating over the hash table. Just | |
138 | * change the node key. | |
139 | */ | |
140 | stream->node.key = -1; | |
141 | } | |
142 | rcu_read_unlock(); | |
7ad0a0cb MD |
143 | } |
144 | ||
d56db448 DG |
145 | /* |
146 | * Return a channel object for the given key. | |
147 | * | |
148 | * RCU read side lock MUST be acquired before calling this function and | |
149 | * protects the channel ptr. | |
150 | */ | |
3bd1e081 MD |
151 | static struct lttng_consumer_channel *consumer_find_channel(int key) |
152 | { | |
e4421fec DG |
153 | struct lttng_ht_iter iter; |
154 | struct lttng_ht_node_ulong *node; | |
155 | struct lttng_consumer_channel *channel = NULL; | |
3bd1e081 | 156 | |
7ad0a0cb | 157 | /* Negative keys are lookup failures */ |
7a57cf92 | 158 | if (key < 0) { |
7ad0a0cb | 159 | return NULL; |
7a57cf92 | 160 | } |
e4421fec DG |
161 | |
162 | lttng_ht_lookup(consumer_data.channel_ht, (void *)((unsigned long) key), | |
163 | &iter); | |
164 | node = lttng_ht_iter_get_node_ulong(&iter); | |
165 | if (node != NULL) { | |
166 | channel = caa_container_of(node, struct lttng_consumer_channel, node); | |
3bd1e081 | 167 | } |
e4421fec DG |
168 | |
169 | return channel; | |
3bd1e081 MD |
170 | } |
171 | ||
7ad0a0cb MD |
172 | static void consumer_steal_channel_key(int key) |
173 | { | |
174 | struct lttng_consumer_channel *channel; | |
175 | ||
04253271 | 176 | rcu_read_lock(); |
7ad0a0cb | 177 | channel = consumer_find_channel(key); |
04253271 | 178 | if (channel) { |
7ad0a0cb | 179 | channel->key = -1; |
04253271 MD |
180 | /* |
181 | * We don't want the lookup to match, but we still need | |
182 | * to iterate on this channel when iterating over the hash table. Just | |
183 | * change the node key. | |
184 | */ | |
185 | channel->node.key = -1; | |
186 | } | |
187 | rcu_read_unlock(); | |
7ad0a0cb MD |
188 | } |
189 | ||
702b1ea4 MD |
190 | static |
191 | void consumer_free_stream(struct rcu_head *head) | |
192 | { | |
193 | struct lttng_ht_node_ulong *node = | |
194 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
195 | struct lttng_consumer_stream *stream = | |
196 | caa_container_of(node, struct lttng_consumer_stream, node); | |
197 | ||
198 | free(stream); | |
199 | } | |
200 | ||
00e2e675 DG |
201 | /* |
202 | * RCU protected relayd socket pair free. | |
203 | */ | |
204 | static void consumer_rcu_free_relayd(struct rcu_head *head) | |
205 | { | |
206 | struct lttng_ht_node_ulong *node = | |
207 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
208 | struct consumer_relayd_sock_pair *relayd = | |
209 | caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
210 | ||
8994307f DG |
211 | /* |
212 | * Close all sockets. This is done in the call RCU since we don't want the | |
213 | * socket fds to be reassigned thus potentially creating bad state of the | |
214 | * relayd object. | |
215 | * | |
216 | * We do not have to lock the control socket mutex here since at this stage | |
217 | * there is no one referencing to this relayd object. | |
218 | */ | |
219 | (void) relayd_close(&relayd->control_sock); | |
220 | (void) relayd_close(&relayd->data_sock); | |
221 | ||
00e2e675 DG |
222 | free(relayd); |
223 | } | |
224 | ||
225 | /* | |
226 | * Destroy and free relayd socket pair object. | |
227 | * | |
228 | * This function MUST be called with the consumer_data lock acquired. | |
229 | */ | |
d09e1200 | 230 | static void destroy_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
231 | { |
232 | int ret; | |
233 | struct lttng_ht_iter iter; | |
46e6455f | 234 | struct lttng_ht_node_ulong *node; |
00e2e675 | 235 | |
173af62f DG |
236 | if (relayd == NULL) { |
237 | return; | |
238 | } | |
239 | ||
00e2e675 DG |
240 | DBG("Consumer destroy and close relayd socket pair"); |
241 | ||
f7079f67 | 242 | /* Loockup for a relayd node in the session id map hash table. */ |
46e6455f | 243 | lttng_ht_lookup(relayd_session_id_ht, |
f7079f67 | 244 | (void *)((unsigned long) relayd->sessiond_session_id), &iter); |
46e6455f | 245 | node = lttng_ht_iter_get_node_ulong(&iter); |
8fa0b55b | 246 | if (node == NULL) { |
46e6455f DG |
247 | /* We assume the relayd is being or is destroyed */ |
248 | return; | |
249 | } | |
250 | ||
f7079f67 DG |
251 | /* |
252 | * Try to delete it from the relayd session id ht. The return value is of | |
253 | * no importance since either way we are going to try to delete the relayd | |
254 | * from the global relayd_ht. | |
255 | */ | |
256 | lttng_ht_del(relayd_session_id_ht, &iter); | |
46e6455f | 257 | |
00e2e675 DG |
258 | iter.iter.node = &relayd->node.node; |
259 | ret = lttng_ht_del(consumer_data.relayd_ht, &iter); | |
173af62f | 260 | if (ret != 0) { |
8994307f | 261 | /* We assume the relayd is being or is destroyed */ |
173af62f DG |
262 | return; |
263 | } | |
00e2e675 | 264 | |
00e2e675 DG |
265 | /* RCU free() call */ |
266 | call_rcu(&relayd->node.head, consumer_rcu_free_relayd); | |
267 | } | |
268 | ||
228b5bf7 DG |
269 | /* |
270 | * Iterate over the relayd hash table and destroy each element. Finally, | |
271 | * destroy the whole hash table. | |
272 | */ | |
273 | static void cleanup_relayd_ht(void) | |
274 | { | |
275 | struct lttng_ht_iter iter; | |
276 | struct consumer_relayd_sock_pair *relayd; | |
277 | ||
278 | rcu_read_lock(); | |
279 | ||
280 | cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd, | |
281 | node.node) { | |
282 | destroy_relayd(relayd); | |
283 | } | |
284 | ||
285 | lttng_ht_destroy(consumer_data.relayd_ht); | |
f7079f67 DG |
286 | /* The destroy_relayd call makes sure that this ht is empty here. */ |
287 | lttng_ht_destroy(relayd_session_id_ht); | |
228b5bf7 DG |
288 | |
289 | rcu_read_unlock(); | |
290 | } | |
291 | ||
8994307f DG |
292 | /* |
293 | * Update the end point status of all streams having the given network sequence | |
294 | * index (relayd index). | |
295 | * | |
296 | * It's atomically set without having the stream mutex locked which is fine | |
297 | * because we handle the write/read race with a pipe wakeup for each thread. | |
298 | */ | |
299 | static void update_endpoint_status_by_netidx(int net_seq_idx, | |
300 | enum consumer_endpoint_status status) | |
301 | { | |
302 | struct lttng_ht_iter iter; | |
303 | struct lttng_consumer_stream *stream; | |
304 | ||
305 | DBG("Consumer set delete flag on stream by idx %d", net_seq_idx); | |
306 | ||
307 | rcu_read_lock(); | |
308 | ||
309 | /* Let's begin with metadata */ | |
310 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) { | |
311 | if (stream->net_seq_idx == net_seq_idx) { | |
312 | uatomic_set(&stream->endpoint_status, status); | |
313 | DBG("Delete flag set to metadata stream %d", stream->wait_fd); | |
314 | } | |
315 | } | |
316 | ||
317 | /* Follow up by the data streams */ | |
318 | cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) { | |
319 | if (stream->net_seq_idx == net_seq_idx) { | |
320 | uatomic_set(&stream->endpoint_status, status); | |
321 | DBG("Delete flag set to data stream %d", stream->wait_fd); | |
322 | } | |
323 | } | |
324 | rcu_read_unlock(); | |
325 | } | |
326 | ||
327 | /* | |
328 | * Cleanup a relayd object by flagging every associated streams for deletion, | |
329 | * destroying the object meaning removing it from the relayd hash table, | |
330 | * closing the sockets and freeing the memory in a RCU call. | |
331 | * | |
332 | * If a local data context is available, notify the threads that the streams' | |
333 | * state have changed. | |
334 | */ | |
335 | static void cleanup_relayd(struct consumer_relayd_sock_pair *relayd, | |
336 | struct lttng_consumer_local_data *ctx) | |
337 | { | |
338 | int netidx; | |
339 | ||
340 | assert(relayd); | |
341 | ||
9617607b DG |
342 | DBG("Cleaning up relayd sockets"); |
343 | ||
8994307f DG |
344 | /* Save the net sequence index before destroying the object */ |
345 | netidx = relayd->net_seq_idx; | |
346 | ||
347 | /* | |
348 | * Delete the relayd from the relayd hash table, close the sockets and free | |
349 | * the object in a RCU call. | |
350 | */ | |
351 | destroy_relayd(relayd); | |
352 | ||
353 | /* Set inactive endpoint to all streams */ | |
354 | update_endpoint_status_by_netidx(netidx, CONSUMER_ENDPOINT_INACTIVE); | |
355 | ||
356 | /* | |
357 | * With a local data context, notify the threads that the streams' state | |
358 | * have changed. The write() action on the pipe acts as an "implicit" | |
359 | * memory barrier ordering the updates of the end point status from the | |
360 | * read of this status which happens AFTER receiving this notify. | |
361 | */ | |
362 | if (ctx) { | |
363 | notify_thread_pipe(ctx->consumer_data_pipe[1]); | |
364 | notify_thread_pipe(ctx->consumer_metadata_pipe[1]); | |
365 | } | |
366 | } | |
367 | ||
a6ba4fe1 DG |
368 | /* |
369 | * Flag a relayd socket pair for destruction. Destroy it if the refcount | |
370 | * reaches zero. | |
371 | * | |
372 | * RCU read side lock MUST be aquired before calling this function. | |
373 | */ | |
374 | void consumer_flag_relayd_for_destroy(struct consumer_relayd_sock_pair *relayd) | |
375 | { | |
376 | assert(relayd); | |
377 | ||
378 | /* Set destroy flag for this object */ | |
379 | uatomic_set(&relayd->destroy_flag, 1); | |
380 | ||
381 | /* Destroy the relayd if refcount is 0 */ | |
382 | if (uatomic_read(&relayd->refcount) == 0) { | |
d09e1200 | 383 | destroy_relayd(relayd); |
a6ba4fe1 DG |
384 | } |
385 | } | |
386 | ||
3bd1e081 MD |
387 | /* |
388 | * Remove a stream from the global list protected by a mutex. This | |
389 | * function is also responsible for freeing its data structures. | |
390 | */ | |
e316aad5 DG |
391 | void consumer_del_stream(struct lttng_consumer_stream *stream, |
392 | struct lttng_ht *ht) | |
3bd1e081 MD |
393 | { |
394 | int ret; | |
e4421fec | 395 | struct lttng_ht_iter iter; |
3bd1e081 | 396 | struct lttng_consumer_channel *free_chan = NULL; |
00e2e675 DG |
397 | struct consumer_relayd_sock_pair *relayd; |
398 | ||
399 | assert(stream); | |
3bd1e081 | 400 | |
8994307f DG |
401 | DBG("Consumer del stream %d", stream->wait_fd); |
402 | ||
e316aad5 DG |
403 | if (ht == NULL) { |
404 | /* Means the stream was allocated but not successfully added */ | |
405 | goto free_stream; | |
406 | } | |
407 | ||
3bd1e081 | 408 | pthread_mutex_lock(&consumer_data.lock); |
74251bb8 | 409 | pthread_mutex_lock(&stream->lock); |
3bd1e081 MD |
410 | |
411 | switch (consumer_data.type) { | |
412 | case LTTNG_CONSUMER_KERNEL: | |
413 | if (stream->mmap_base != NULL) { | |
414 | ret = munmap(stream->mmap_base, stream->mmap_len); | |
415 | if (ret != 0) { | |
7a57cf92 | 416 | PERROR("munmap"); |
3bd1e081 MD |
417 | } |
418 | } | |
419 | break; | |
7753dea8 MD |
420 | case LTTNG_CONSUMER32_UST: |
421 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
422 | lttng_ustconsumer_del_stream(stream); |
423 | break; | |
424 | default: | |
425 | ERR("Unknown consumer_data type"); | |
426 | assert(0); | |
427 | goto end; | |
428 | } | |
429 | ||
6065ceec | 430 | rcu_read_lock(); |
04253271 | 431 | iter.iter.node = &stream->node.node; |
e316aad5 | 432 | ret = lttng_ht_del(ht, &iter); |
04253271 | 433 | assert(!ret); |
ca22feea DG |
434 | |
435 | /* Remove node session id from the consumer_data stream ht */ | |
436 | iter.iter.node = &stream->node_session_id.node; | |
437 | ret = lttng_ht_del(consumer_data.stream_list_ht, &iter); | |
438 | assert(!ret); | |
6065ceec DG |
439 | rcu_read_unlock(); |
440 | ||
50f8ae69 | 441 | assert(consumer_data.stream_count > 0); |
3bd1e081 | 442 | consumer_data.stream_count--; |
50f8ae69 | 443 | |
3bd1e081 | 444 | if (stream->out_fd >= 0) { |
4c462e79 MD |
445 | ret = close(stream->out_fd); |
446 | if (ret) { | |
447 | PERROR("close"); | |
448 | } | |
3bd1e081 | 449 | } |
b5c5fc29 | 450 | if (stream->wait_fd >= 0 && !stream->wait_fd_is_copy) { |
4c462e79 MD |
451 | ret = close(stream->wait_fd); |
452 | if (ret) { | |
453 | PERROR("close"); | |
454 | } | |
3bd1e081 | 455 | } |
2c1dd183 | 456 | if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) { |
4c462e79 MD |
457 | ret = close(stream->shm_fd); |
458 | if (ret) { | |
459 | PERROR("close"); | |
460 | } | |
3bd1e081 | 461 | } |
00e2e675 DG |
462 | |
463 | /* Check and cleanup relayd */ | |
b0b335c8 | 464 | rcu_read_lock(); |
00e2e675 DG |
465 | relayd = consumer_find_relayd(stream->net_seq_idx); |
466 | if (relayd != NULL) { | |
b0b335c8 MD |
467 | uatomic_dec(&relayd->refcount); |
468 | assert(uatomic_read(&relayd->refcount) >= 0); | |
173af62f | 469 | |
3f8e211f DG |
470 | /* Closing streams requires to lock the control socket. */ |
471 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
173af62f DG |
472 | ret = relayd_send_close_stream(&relayd->control_sock, |
473 | stream->relayd_stream_id, | |
474 | stream->next_net_seq_num - 1); | |
3f8e211f | 475 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); |
173af62f | 476 | if (ret < 0) { |
a4b92340 DG |
477 | DBG("Unable to close stream on the relayd. Continuing"); |
478 | /* | |
479 | * Continue here. There is nothing we can do for the relayd. | |
480 | * Chances are that the relayd has closed the socket so we just | |
481 | * continue cleaning up. | |
482 | */ | |
173af62f DG |
483 | } |
484 | ||
485 | /* Both conditions are met, we destroy the relayd. */ | |
486 | if (uatomic_read(&relayd->refcount) == 0 && | |
487 | uatomic_read(&relayd->destroy_flag)) { | |
d09e1200 | 488 | destroy_relayd(relayd); |
00e2e675 | 489 | } |
00e2e675 | 490 | } |
b0b335c8 | 491 | rcu_read_unlock(); |
00e2e675 | 492 | |
c30aaa51 MD |
493 | uatomic_dec(&stream->chan->refcount); |
494 | if (!uatomic_read(&stream->chan->refcount) | |
495 | && !uatomic_read(&stream->chan->nb_init_streams)) { | |
3bd1e081 | 496 | free_chan = stream->chan; |
00e2e675 DG |
497 | } |
498 | ||
3bd1e081 MD |
499 | end: |
500 | consumer_data.need_update = 1; | |
8994307f | 501 | pthread_mutex_unlock(&stream->lock); |
74251bb8 | 502 | pthread_mutex_unlock(&consumer_data.lock); |
3bd1e081 | 503 | |
c30aaa51 | 504 | if (free_chan) { |
3bd1e081 | 505 | consumer_del_channel(free_chan); |
c30aaa51 | 506 | } |
e316aad5 DG |
507 | |
508 | free_stream: | |
509 | call_rcu(&stream->node.head, consumer_free_stream); | |
3bd1e081 MD |
510 | } |
511 | ||
512 | struct lttng_consumer_stream *consumer_allocate_stream( | |
513 | int channel_key, int stream_key, | |
514 | int shm_fd, int wait_fd, | |
515 | enum lttng_consumer_stream_state state, | |
516 | uint64_t mmap_len, | |
517 | enum lttng_event_output output, | |
6df2e2c9 MD |
518 | const char *path_name, |
519 | uid_t uid, | |
00e2e675 DG |
520 | gid_t gid, |
521 | int net_index, | |
c80048c6 | 522 | int metadata_flag, |
53632229 | 523 | uint64_t session_id, |
c80048c6 | 524 | int *alloc_ret) |
3bd1e081 MD |
525 | { |
526 | struct lttng_consumer_stream *stream; | |
3bd1e081 | 527 | |
effcf122 | 528 | stream = zmalloc(sizeof(*stream)); |
3bd1e081 | 529 | if (stream == NULL) { |
7a57cf92 | 530 | PERROR("malloc struct lttng_consumer_stream"); |
c80048c6 | 531 | *alloc_ret = -ENOMEM; |
7a57cf92 | 532 | goto end; |
3bd1e081 | 533 | } |
7a57cf92 | 534 | |
d56db448 DG |
535 | rcu_read_lock(); |
536 | ||
7a57cf92 DG |
537 | /* |
538 | * Get stream's channel reference. Needed when adding the stream to the | |
539 | * global hash table. | |
540 | */ | |
3bd1e081 MD |
541 | stream->chan = consumer_find_channel(channel_key); |
542 | if (!stream->chan) { | |
c80048c6 | 543 | *alloc_ret = -ENOENT; |
7a57cf92 | 544 | ERR("Unable to find channel for stream %d", stream_key); |
c80048c6 | 545 | goto error; |
3bd1e081 | 546 | } |
e316aad5 | 547 | |
3bd1e081 MD |
548 | stream->key = stream_key; |
549 | stream->shm_fd = shm_fd; | |
550 | stream->wait_fd = wait_fd; | |
551 | stream->out_fd = -1; | |
552 | stream->out_fd_offset = 0; | |
553 | stream->state = state; | |
554 | stream->mmap_len = mmap_len; | |
555 | stream->mmap_base = NULL; | |
556 | stream->output = output; | |
6df2e2c9 MD |
557 | stream->uid = uid; |
558 | stream->gid = gid; | |
00e2e675 DG |
559 | stream->net_seq_idx = net_index; |
560 | stream->metadata_flag = metadata_flag; | |
53632229 | 561 | stream->session_id = session_id; |
00e2e675 DG |
562 | strncpy(stream->path_name, path_name, sizeof(stream->path_name)); |
563 | stream->path_name[sizeof(stream->path_name) - 1] = '\0'; | |
53632229 | 564 | pthread_mutex_init(&stream->lock, NULL); |
58b1f425 DG |
565 | |
566 | /* | |
567 | * Index differently the metadata node because the thread is using an | |
568 | * internal hash table to match streams in the metadata_ht to the epoll set | |
569 | * file descriptor. | |
570 | */ | |
571 | if (metadata_flag) { | |
572 | lttng_ht_node_init_ulong(&stream->node, stream->wait_fd); | |
573 | } else { | |
574 | lttng_ht_node_init_ulong(&stream->node, stream->key); | |
575 | } | |
c30aaa51 | 576 | |
53632229 DG |
577 | /* Init session id node with the stream session id */ |
578 | lttng_ht_node_init_ulong(&stream->node_session_id, stream->session_id); | |
579 | ||
c869f647 DG |
580 | /* |
581 | * The cpu number is needed before using any ustctl_* actions. Ignored for | |
582 | * the kernel so the value does not matter. | |
583 | */ | |
584 | pthread_mutex_lock(&consumer_data.lock); | |
585 | stream->cpu = stream->chan->cpucount++; | |
586 | pthread_mutex_unlock(&consumer_data.lock); | |
587 | ||
c30aaa51 | 588 | DBG3("Allocated stream %s (key %d, shm_fd %d, wait_fd %d, mmap_len %llu," |
53632229 DG |
589 | " out_fd %d, net_seq_idx %d, session_id %" PRIu64, |
590 | stream->path_name, stream->key, stream->shm_fd, stream->wait_fd, | |
c30aaa51 | 591 | (unsigned long long) stream->mmap_len, stream->out_fd, |
53632229 | 592 | stream->net_seq_idx, stream->session_id); |
d56db448 DG |
593 | |
594 | rcu_read_unlock(); | |
3bd1e081 | 595 | return stream; |
c80048c6 MD |
596 | |
597 | error: | |
d56db448 | 598 | rcu_read_unlock(); |
c80048c6 | 599 | free(stream); |
7a57cf92 | 600 | end: |
c80048c6 | 601 | return NULL; |
3bd1e081 MD |
602 | } |
603 | ||
604 | /* | |
605 | * Add a stream to the global list protected by a mutex. | |
606 | */ | |
43c34bc3 DG |
607 | static int consumer_add_stream(struct lttng_consumer_stream *stream, |
608 | struct lttng_ht *ht) | |
3bd1e081 MD |
609 | { |
610 | int ret = 0; | |
00e2e675 | 611 | struct consumer_relayd_sock_pair *relayd; |
3bd1e081 | 612 | |
e316aad5 | 613 | assert(stream); |
43c34bc3 | 614 | assert(ht); |
c77fc10a | 615 | |
e316aad5 DG |
616 | DBG3("Adding consumer stream %d", stream->key); |
617 | ||
618 | pthread_mutex_lock(&consumer_data.lock); | |
2e818a6a | 619 | pthread_mutex_lock(&stream->lock); |
b0b335c8 | 620 | rcu_read_lock(); |
e316aad5 | 621 | |
43c34bc3 DG |
622 | /* Steal stream identifier to avoid having streams with the same key */ |
623 | consumer_steal_stream_key(stream->key, ht); | |
624 | ||
625 | lttng_ht_add_unique_ulong(ht, &stream->node); | |
00e2e675 | 626 | |
ca22feea DG |
627 | /* |
628 | * Add stream to the stream_list_ht of the consumer data. No need to steal | |
629 | * the key since the HT does not use it and we allow to add redundant keys | |
630 | * into this table. | |
631 | */ | |
632 | lttng_ht_add_ulong(consumer_data.stream_list_ht, &stream->node_session_id); | |
633 | ||
00e2e675 DG |
634 | /* Check and cleanup relayd */ |
635 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
636 | if (relayd != NULL) { | |
b0b335c8 | 637 | uatomic_inc(&relayd->refcount); |
00e2e675 DG |
638 | } |
639 | ||
e316aad5 DG |
640 | /* Update channel refcount once added without error(s). */ |
641 | uatomic_inc(&stream->chan->refcount); | |
642 | ||
643 | /* | |
644 | * When nb_init_streams reaches 0, we don't need to trigger any action in | |
645 | * terms of destroying the associated channel, because the action that | |
646 | * causes the count to become 0 also causes a stream to be added. The | |
647 | * channel deletion will thus be triggered by the following removal of this | |
648 | * stream. | |
649 | */ | |
650 | if (uatomic_read(&stream->chan->nb_init_streams) > 0) { | |
651 | uatomic_dec(&stream->chan->nb_init_streams); | |
652 | } | |
653 | ||
654 | /* Update consumer data once the node is inserted. */ | |
3bd1e081 MD |
655 | consumer_data.stream_count++; |
656 | consumer_data.need_update = 1; | |
657 | ||
e316aad5 | 658 | rcu_read_unlock(); |
2e818a6a | 659 | pthread_mutex_unlock(&stream->lock); |
3bd1e081 | 660 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 661 | |
3bd1e081 MD |
662 | return ret; |
663 | } | |
664 | ||
00e2e675 | 665 | /* |
3f8e211f DG |
666 | * Add relayd socket to global consumer data hashtable. RCU read side lock MUST |
667 | * be acquired before calling this. | |
00e2e675 | 668 | */ |
d09e1200 | 669 | static int add_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
670 | { |
671 | int ret = 0; | |
672 | struct lttng_ht_node_ulong *node; | |
673 | struct lttng_ht_iter iter; | |
674 | ||
675 | if (relayd == NULL) { | |
676 | ret = -1; | |
677 | goto end; | |
678 | } | |
679 | ||
00e2e675 DG |
680 | lttng_ht_lookup(consumer_data.relayd_ht, |
681 | (void *)((unsigned long) relayd->net_seq_idx), &iter); | |
682 | node = lttng_ht_iter_get_node_ulong(&iter); | |
683 | if (node != NULL) { | |
00e2e675 DG |
684 | /* Relayd already exist. Ignore the insertion */ |
685 | goto end; | |
686 | } | |
687 | lttng_ht_add_unique_ulong(consumer_data.relayd_ht, &relayd->node); | |
688 | ||
00e2e675 DG |
689 | end: |
690 | return ret; | |
691 | } | |
692 | ||
693 | /* | |
694 | * Allocate and return a consumer relayd socket. | |
695 | */ | |
696 | struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair( | |
697 | int net_seq_idx) | |
698 | { | |
699 | struct consumer_relayd_sock_pair *obj = NULL; | |
700 | ||
701 | /* Negative net sequence index is a failure */ | |
702 | if (net_seq_idx < 0) { | |
703 | goto error; | |
704 | } | |
705 | ||
706 | obj = zmalloc(sizeof(struct consumer_relayd_sock_pair)); | |
707 | if (obj == NULL) { | |
708 | PERROR("zmalloc relayd sock"); | |
709 | goto error; | |
710 | } | |
711 | ||
712 | obj->net_seq_idx = net_seq_idx; | |
713 | obj->refcount = 0; | |
173af62f | 714 | obj->destroy_flag = 0; |
00e2e675 DG |
715 | lttng_ht_node_init_ulong(&obj->node, obj->net_seq_idx); |
716 | pthread_mutex_init(&obj->ctrl_sock_mutex, NULL); | |
717 | ||
718 | error: | |
719 | return obj; | |
720 | } | |
721 | ||
722 | /* | |
723 | * Find a relayd socket pair in the global consumer data. | |
724 | * | |
725 | * Return the object if found else NULL. | |
b0b335c8 MD |
726 | * RCU read-side lock must be held across this call and while using the |
727 | * returned object. | |
00e2e675 DG |
728 | */ |
729 | struct consumer_relayd_sock_pair *consumer_find_relayd(int key) | |
730 | { | |
731 | struct lttng_ht_iter iter; | |
732 | struct lttng_ht_node_ulong *node; | |
733 | struct consumer_relayd_sock_pair *relayd = NULL; | |
734 | ||
735 | /* Negative keys are lookup failures */ | |
736 | if (key < 0) { | |
737 | goto error; | |
738 | } | |
739 | ||
00e2e675 DG |
740 | lttng_ht_lookup(consumer_data.relayd_ht, (void *)((unsigned long) key), |
741 | &iter); | |
742 | node = lttng_ht_iter_get_node_ulong(&iter); | |
743 | if (node != NULL) { | |
744 | relayd = caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
745 | } | |
746 | ||
00e2e675 DG |
747 | error: |
748 | return relayd; | |
749 | } | |
750 | ||
751 | /* | |
752 | * Handle stream for relayd transmission if the stream applies for network | |
753 | * streaming where the net sequence index is set. | |
754 | * | |
755 | * Return destination file descriptor or negative value on error. | |
756 | */ | |
6197aea7 | 757 | static int write_relayd_stream_header(struct lttng_consumer_stream *stream, |
1d4dfdef DG |
758 | size_t data_size, unsigned long padding, |
759 | struct consumer_relayd_sock_pair *relayd) | |
00e2e675 DG |
760 | { |
761 | int outfd = -1, ret; | |
00e2e675 DG |
762 | struct lttcomm_relayd_data_hdr data_hdr; |
763 | ||
764 | /* Safety net */ | |
765 | assert(stream); | |
6197aea7 | 766 | assert(relayd); |
00e2e675 DG |
767 | |
768 | /* Reset data header */ | |
769 | memset(&data_hdr, 0, sizeof(data_hdr)); | |
770 | ||
00e2e675 DG |
771 | if (stream->metadata_flag) { |
772 | /* Caller MUST acquire the relayd control socket lock */ | |
773 | ret = relayd_send_metadata(&relayd->control_sock, data_size); | |
774 | if (ret < 0) { | |
775 | goto error; | |
776 | } | |
777 | ||
778 | /* Metadata are always sent on the control socket. */ | |
779 | outfd = relayd->control_sock.fd; | |
780 | } else { | |
781 | /* Set header with stream information */ | |
782 | data_hdr.stream_id = htobe64(stream->relayd_stream_id); | |
783 | data_hdr.data_size = htobe32(data_size); | |
1d4dfdef | 784 | data_hdr.padding_size = htobe32(padding); |
173af62f | 785 | data_hdr.net_seq_num = htobe64(stream->next_net_seq_num++); |
00e2e675 DG |
786 | /* Other fields are zeroed previously */ |
787 | ||
788 | ret = relayd_send_data_hdr(&relayd->data_sock, &data_hdr, | |
789 | sizeof(data_hdr)); | |
790 | if (ret < 0) { | |
791 | goto error; | |
792 | } | |
793 | ||
794 | /* Set to go on data socket */ | |
795 | outfd = relayd->data_sock.fd; | |
796 | } | |
797 | ||
798 | error: | |
799 | return outfd; | |
800 | } | |
801 | ||
702b1ea4 MD |
802 | static |
803 | void consumer_free_channel(struct rcu_head *head) | |
804 | { | |
805 | struct lttng_ht_node_ulong *node = | |
806 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
807 | struct lttng_consumer_channel *channel = | |
808 | caa_container_of(node, struct lttng_consumer_channel, node); | |
809 | ||
810 | free(channel); | |
811 | } | |
812 | ||
3bd1e081 MD |
813 | /* |
814 | * Remove a channel from the global list protected by a mutex. This | |
815 | * function is also responsible for freeing its data structures. | |
816 | */ | |
817 | void consumer_del_channel(struct lttng_consumer_channel *channel) | |
818 | { | |
819 | int ret; | |
e4421fec | 820 | struct lttng_ht_iter iter; |
3bd1e081 | 821 | |
5c540210 DG |
822 | DBG("Consumer delete channel key %d", channel->key); |
823 | ||
3bd1e081 MD |
824 | pthread_mutex_lock(&consumer_data.lock); |
825 | ||
826 | switch (consumer_data.type) { | |
827 | case LTTNG_CONSUMER_KERNEL: | |
828 | break; | |
7753dea8 MD |
829 | case LTTNG_CONSUMER32_UST: |
830 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
831 | lttng_ustconsumer_del_channel(channel); |
832 | break; | |
833 | default: | |
834 | ERR("Unknown consumer_data type"); | |
835 | assert(0); | |
836 | goto end; | |
837 | } | |
838 | ||
6065ceec | 839 | rcu_read_lock(); |
04253271 MD |
840 | iter.iter.node = &channel->node.node; |
841 | ret = lttng_ht_del(consumer_data.channel_ht, &iter); | |
842 | assert(!ret); | |
6065ceec DG |
843 | rcu_read_unlock(); |
844 | ||
3bd1e081 MD |
845 | if (channel->mmap_base != NULL) { |
846 | ret = munmap(channel->mmap_base, channel->mmap_len); | |
847 | if (ret != 0) { | |
7a57cf92 | 848 | PERROR("munmap"); |
3bd1e081 MD |
849 | } |
850 | } | |
b5c5fc29 | 851 | if (channel->wait_fd >= 0 && !channel->wait_fd_is_copy) { |
4c462e79 MD |
852 | ret = close(channel->wait_fd); |
853 | if (ret) { | |
854 | PERROR("close"); | |
855 | } | |
3bd1e081 | 856 | } |
2c1dd183 | 857 | if (channel->shm_fd >= 0 && channel->wait_fd != channel->shm_fd) { |
4c462e79 MD |
858 | ret = close(channel->shm_fd); |
859 | if (ret) { | |
860 | PERROR("close"); | |
861 | } | |
3bd1e081 | 862 | } |
702b1ea4 MD |
863 | |
864 | call_rcu(&channel->node.head, consumer_free_channel); | |
3bd1e081 MD |
865 | end: |
866 | pthread_mutex_unlock(&consumer_data.lock); | |
867 | } | |
868 | ||
869 | struct lttng_consumer_channel *consumer_allocate_channel( | |
870 | int channel_key, | |
871 | int shm_fd, int wait_fd, | |
872 | uint64_t mmap_len, | |
c30aaa51 MD |
873 | uint64_t max_sb_size, |
874 | unsigned int nb_init_streams) | |
3bd1e081 MD |
875 | { |
876 | struct lttng_consumer_channel *channel; | |
877 | int ret; | |
878 | ||
276b26d1 | 879 | channel = zmalloc(sizeof(*channel)); |
3bd1e081 | 880 | if (channel == NULL) { |
7a57cf92 | 881 | PERROR("malloc struct lttng_consumer_channel"); |
3bd1e081 MD |
882 | goto end; |
883 | } | |
884 | channel->key = channel_key; | |
885 | channel->shm_fd = shm_fd; | |
886 | channel->wait_fd = wait_fd; | |
887 | channel->mmap_len = mmap_len; | |
888 | channel->max_sb_size = max_sb_size; | |
889 | channel->refcount = 0; | |
c30aaa51 | 890 | channel->nb_init_streams = nb_init_streams; |
e4421fec | 891 | lttng_ht_node_init_ulong(&channel->node, channel->key); |
3bd1e081 MD |
892 | |
893 | switch (consumer_data.type) { | |
894 | case LTTNG_CONSUMER_KERNEL: | |
895 | channel->mmap_base = NULL; | |
896 | channel->mmap_len = 0; | |
897 | break; | |
7753dea8 MD |
898 | case LTTNG_CONSUMER32_UST: |
899 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
900 | ret = lttng_ustconsumer_allocate_channel(channel); |
901 | if (ret) { | |
902 | free(channel); | |
903 | return NULL; | |
904 | } | |
905 | break; | |
906 | default: | |
907 | ERR("Unknown consumer_data type"); | |
908 | assert(0); | |
909 | goto end; | |
910 | } | |
911 | DBG("Allocated channel (key %d, shm_fd %d, wait_fd %d, mmap_len %llu, max_sb_size %llu)", | |
00e2e675 | 912 | channel->key, channel->shm_fd, channel->wait_fd, |
3bd1e081 MD |
913 | (unsigned long long) channel->mmap_len, |
914 | (unsigned long long) channel->max_sb_size); | |
915 | end: | |
916 | return channel; | |
917 | } | |
918 | ||
919 | /* | |
920 | * Add a channel to the global list protected by a mutex. | |
921 | */ | |
922 | int consumer_add_channel(struct lttng_consumer_channel *channel) | |
923 | { | |
c77fc10a DG |
924 | struct lttng_ht_node_ulong *node; |
925 | struct lttng_ht_iter iter; | |
926 | ||
3bd1e081 | 927 | pthread_mutex_lock(&consumer_data.lock); |
7ad0a0cb MD |
928 | /* Steal channel identifier, for UST */ |
929 | consumer_steal_channel_key(channel->key); | |
6065ceec | 930 | rcu_read_lock(); |
c77fc10a DG |
931 | |
932 | lttng_ht_lookup(consumer_data.channel_ht, | |
933 | (void *)((unsigned long) channel->key), &iter); | |
934 | node = lttng_ht_iter_get_node_ulong(&iter); | |
935 | if (node != NULL) { | |
936 | /* Channel already exist. Ignore the insertion */ | |
937 | goto end; | |
938 | } | |
939 | ||
04253271 | 940 | lttng_ht_add_unique_ulong(consumer_data.channel_ht, &channel->node); |
c77fc10a DG |
941 | |
942 | end: | |
6065ceec | 943 | rcu_read_unlock(); |
3bd1e081 | 944 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 945 | |
7ad0a0cb | 946 | return 0; |
3bd1e081 MD |
947 | } |
948 | ||
949 | /* | |
950 | * Allocate the pollfd structure and the local view of the out fds to avoid | |
951 | * doing a lookup in the linked list and concurrency issues when writing is | |
952 | * needed. Called with consumer_data.lock held. | |
953 | * | |
954 | * Returns the number of fds in the structures. | |
955 | */ | |
43c34bc3 | 956 | static int consumer_update_poll_array( |
3bd1e081 | 957 | struct lttng_consumer_local_data *ctx, struct pollfd **pollfd, |
43c34bc3 | 958 | struct lttng_consumer_stream **local_stream, struct lttng_ht *ht) |
3bd1e081 | 959 | { |
3bd1e081 | 960 | int i = 0; |
e4421fec DG |
961 | struct lttng_ht_iter iter; |
962 | struct lttng_consumer_stream *stream; | |
3bd1e081 MD |
963 | |
964 | DBG("Updating poll fd array"); | |
481d6c57 | 965 | rcu_read_lock(); |
43c34bc3 | 966 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { |
8994307f DG |
967 | /* |
968 | * Only active streams with an active end point can be added to the | |
969 | * poll set and local stream storage of the thread. | |
970 | * | |
971 | * There is a potential race here for endpoint_status to be updated | |
972 | * just after the check. However, this is OK since the stream(s) will | |
973 | * be deleted once the thread is notified that the end point state has | |
974 | * changed where this function will be called back again. | |
975 | */ | |
976 | if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM || | |
79d4ffb7 | 977 | stream->endpoint_status == CONSUMER_ENDPOINT_INACTIVE) { |
3bd1e081 MD |
978 | continue; |
979 | } | |
e4421fec DG |
980 | DBG("Active FD %d", stream->wait_fd); |
981 | (*pollfd)[i].fd = stream->wait_fd; | |
3bd1e081 | 982 | (*pollfd)[i].events = POLLIN | POLLPRI; |
e4421fec | 983 | local_stream[i] = stream; |
3bd1e081 MD |
984 | i++; |
985 | } | |
481d6c57 | 986 | rcu_read_unlock(); |
3bd1e081 MD |
987 | |
988 | /* | |
50f8ae69 | 989 | * Insert the consumer_data_pipe at the end of the array and don't |
3bd1e081 MD |
990 | * increment i so nb_fd is the number of real FD. |
991 | */ | |
50f8ae69 | 992 | (*pollfd)[i].fd = ctx->consumer_data_pipe[0]; |
509bb1cf | 993 | (*pollfd)[i].events = POLLIN | POLLPRI; |
3bd1e081 MD |
994 | return i; |
995 | } | |
996 | ||
997 | /* | |
998 | * Poll on the should_quit pipe and the command socket return -1 on error and | |
999 | * should exit, 0 if data is available on the command socket | |
1000 | */ | |
1001 | int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll) | |
1002 | { | |
1003 | int num_rdy; | |
1004 | ||
88f2b785 | 1005 | restart: |
3bd1e081 MD |
1006 | num_rdy = poll(consumer_sockpoll, 2, -1); |
1007 | if (num_rdy == -1) { | |
88f2b785 MD |
1008 | /* |
1009 | * Restart interrupted system call. | |
1010 | */ | |
1011 | if (errno == EINTR) { | |
1012 | goto restart; | |
1013 | } | |
7a57cf92 | 1014 | PERROR("Poll error"); |
3bd1e081 MD |
1015 | goto exit; |
1016 | } | |
509bb1cf | 1017 | if (consumer_sockpoll[0].revents & (POLLIN | POLLPRI)) { |
3bd1e081 MD |
1018 | DBG("consumer_should_quit wake up"); |
1019 | goto exit; | |
1020 | } | |
1021 | return 0; | |
1022 | ||
1023 | exit: | |
1024 | return -1; | |
1025 | } | |
1026 | ||
1027 | /* | |
1028 | * Set the error socket. | |
1029 | */ | |
1030 | void lttng_consumer_set_error_sock( | |
1031 | struct lttng_consumer_local_data *ctx, int sock) | |
1032 | { | |
1033 | ctx->consumer_error_socket = sock; | |
1034 | } | |
1035 | ||
1036 | /* | |
1037 | * Set the command socket path. | |
1038 | */ | |
3bd1e081 MD |
1039 | void lttng_consumer_set_command_sock_path( |
1040 | struct lttng_consumer_local_data *ctx, char *sock) | |
1041 | { | |
1042 | ctx->consumer_command_sock_path = sock; | |
1043 | } | |
1044 | ||
1045 | /* | |
1046 | * Send return code to the session daemon. | |
1047 | * If the socket is not defined, we return 0, it is not a fatal error | |
1048 | */ | |
1049 | int lttng_consumer_send_error( | |
1050 | struct lttng_consumer_local_data *ctx, int cmd) | |
1051 | { | |
1052 | if (ctx->consumer_error_socket > 0) { | |
1053 | return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd, | |
1054 | sizeof(enum lttcomm_sessiond_command)); | |
1055 | } | |
1056 | ||
1057 | return 0; | |
1058 | } | |
1059 | ||
1060 | /* | |
228b5bf7 DG |
1061 | * Close all the tracefiles and stream fds and MUST be called when all |
1062 | * instances are destroyed i.e. when all threads were joined and are ended. | |
3bd1e081 MD |
1063 | */ |
1064 | void lttng_consumer_cleanup(void) | |
1065 | { | |
e4421fec | 1066 | struct lttng_ht_iter iter; |
6065ceec DG |
1067 | struct lttng_ht_node_ulong *node; |
1068 | ||
1069 | rcu_read_lock(); | |
3bd1e081 | 1070 | |
6065ceec DG |
1071 | cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, node, |
1072 | node) { | |
702b1ea4 MD |
1073 | struct lttng_consumer_channel *channel = |
1074 | caa_container_of(node, struct lttng_consumer_channel, node); | |
1075 | consumer_del_channel(channel); | |
3bd1e081 | 1076 | } |
6065ceec DG |
1077 | |
1078 | rcu_read_unlock(); | |
d6ce1df2 | 1079 | |
d6ce1df2 | 1080 | lttng_ht_destroy(consumer_data.channel_ht); |
228b5bf7 DG |
1081 | |
1082 | cleanup_relayd_ht(); | |
1083 | ||
1084 | /* | |
1085 | * This HT contains streams that are freed by either the metadata thread or | |
1086 | * the data thread so we do *nothing* on the hash table and simply destroy | |
1087 | * it. | |
1088 | */ | |
1089 | lttng_ht_destroy(consumer_data.stream_list_ht); | |
3bd1e081 MD |
1090 | } |
1091 | ||
1092 | /* | |
1093 | * Called from signal handler. | |
1094 | */ | |
1095 | void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx) | |
1096 | { | |
1097 | int ret; | |
1098 | consumer_quit = 1; | |
6f94560a MD |
1099 | do { |
1100 | ret = write(ctx->consumer_should_quit[1], "4", 1); | |
1101 | } while (ret < 0 && errno == EINTR); | |
3bd1e081 | 1102 | if (ret < 0) { |
7a57cf92 | 1103 | PERROR("write consumer quit"); |
3bd1e081 | 1104 | } |
ab1027f4 DG |
1105 | |
1106 | DBG("Consumer flag that it should quit"); | |
3bd1e081 MD |
1107 | } |
1108 | ||
00e2e675 DG |
1109 | void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream, |
1110 | off_t orig_offset) | |
3bd1e081 MD |
1111 | { |
1112 | int outfd = stream->out_fd; | |
1113 | ||
1114 | /* | |
1115 | * This does a blocking write-and-wait on any page that belongs to the | |
1116 | * subbuffer prior to the one we just wrote. | |
1117 | * Don't care about error values, as these are just hints and ways to | |
1118 | * limit the amount of page cache used. | |
1119 | */ | |
1120 | if (orig_offset < stream->chan->max_sb_size) { | |
1121 | return; | |
1122 | } | |
b9182dd9 | 1123 | lttng_sync_file_range(outfd, orig_offset - stream->chan->max_sb_size, |
3bd1e081 MD |
1124 | stream->chan->max_sb_size, |
1125 | SYNC_FILE_RANGE_WAIT_BEFORE | |
1126 | | SYNC_FILE_RANGE_WRITE | |
1127 | | SYNC_FILE_RANGE_WAIT_AFTER); | |
1128 | /* | |
1129 | * Give hints to the kernel about how we access the file: | |
1130 | * POSIX_FADV_DONTNEED : we won't re-access data in a near future after | |
1131 | * we write it. | |
1132 | * | |
1133 | * We need to call fadvise again after the file grows because the | |
1134 | * kernel does not seem to apply fadvise to non-existing parts of the | |
1135 | * file. | |
1136 | * | |
1137 | * Call fadvise _after_ having waited for the page writeback to | |
1138 | * complete because the dirty page writeback semantic is not well | |
1139 | * defined. So it can be expected to lead to lower throughput in | |
1140 | * streaming. | |
1141 | */ | |
1142 | posix_fadvise(outfd, orig_offset - stream->chan->max_sb_size, | |
1143 | stream->chan->max_sb_size, POSIX_FADV_DONTNEED); | |
1144 | } | |
1145 | ||
1146 | /* | |
1147 | * Initialise the necessary environnement : | |
1148 | * - create a new context | |
1149 | * - create the poll_pipe | |
1150 | * - create the should_quit pipe (for signal handler) | |
1151 | * - create the thread pipe (for splice) | |
1152 | * | |
1153 | * Takes a function pointer as argument, this function is called when data is | |
1154 | * available on a buffer. This function is responsible to do the | |
1155 | * kernctl_get_next_subbuf, read the data with mmap or splice depending on the | |
1156 | * buffer configuration and then kernctl_put_next_subbuf at the end. | |
1157 | * | |
1158 | * Returns a pointer to the new context or NULL on error. | |
1159 | */ | |
1160 | struct lttng_consumer_local_data *lttng_consumer_create( | |
1161 | enum lttng_consumer_type type, | |
4078b776 | 1162 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
d41f73b7 | 1163 | struct lttng_consumer_local_data *ctx), |
3bd1e081 MD |
1164 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
1165 | int (*recv_stream)(struct lttng_consumer_stream *stream), | |
1166 | int (*update_stream)(int stream_key, uint32_t state)) | |
1167 | { | |
1168 | int ret, i; | |
1169 | struct lttng_consumer_local_data *ctx; | |
1170 | ||
1171 | assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN || | |
1172 | consumer_data.type == type); | |
1173 | consumer_data.type = type; | |
1174 | ||
effcf122 | 1175 | ctx = zmalloc(sizeof(struct lttng_consumer_local_data)); |
3bd1e081 | 1176 | if (ctx == NULL) { |
7a57cf92 | 1177 | PERROR("allocating context"); |
3bd1e081 MD |
1178 | goto error; |
1179 | } | |
1180 | ||
1181 | ctx->consumer_error_socket = -1; | |
1182 | /* assign the callbacks */ | |
1183 | ctx->on_buffer_ready = buffer_ready; | |
1184 | ctx->on_recv_channel = recv_channel; | |
1185 | ctx->on_recv_stream = recv_stream; | |
1186 | ctx->on_update_stream = update_stream; | |
1187 | ||
50f8ae69 | 1188 | ret = pipe(ctx->consumer_data_pipe); |
3bd1e081 | 1189 | if (ret < 0) { |
7a57cf92 | 1190 | PERROR("Error creating poll pipe"); |
3bd1e081 MD |
1191 | goto error_poll_pipe; |
1192 | } | |
1193 | ||
04fdd819 | 1194 | /* set read end of the pipe to non-blocking */ |
50f8ae69 | 1195 | ret = fcntl(ctx->consumer_data_pipe[0], F_SETFL, O_NONBLOCK); |
04fdd819 | 1196 | if (ret < 0) { |
7a57cf92 | 1197 | PERROR("fcntl O_NONBLOCK"); |
04fdd819 MD |
1198 | goto error_poll_fcntl; |
1199 | } | |
1200 | ||
1201 | /* set write end of the pipe to non-blocking */ | |
50f8ae69 | 1202 | ret = fcntl(ctx->consumer_data_pipe[1], F_SETFL, O_NONBLOCK); |
04fdd819 | 1203 | if (ret < 0) { |
7a57cf92 | 1204 | PERROR("fcntl O_NONBLOCK"); |
04fdd819 MD |
1205 | goto error_poll_fcntl; |
1206 | } | |
1207 | ||
3bd1e081 MD |
1208 | ret = pipe(ctx->consumer_should_quit); |
1209 | if (ret < 0) { | |
7a57cf92 | 1210 | PERROR("Error creating recv pipe"); |
3bd1e081 MD |
1211 | goto error_quit_pipe; |
1212 | } | |
1213 | ||
1214 | ret = pipe(ctx->consumer_thread_pipe); | |
1215 | if (ret < 0) { | |
7a57cf92 | 1216 | PERROR("Error creating thread pipe"); |
3bd1e081 MD |
1217 | goto error_thread_pipe; |
1218 | } | |
1219 | ||
fb3a43a9 DG |
1220 | ret = utils_create_pipe(ctx->consumer_metadata_pipe); |
1221 | if (ret < 0) { | |
1222 | goto error_metadata_pipe; | |
1223 | } | |
3bd1e081 | 1224 | |
fb3a43a9 DG |
1225 | ret = utils_create_pipe(ctx->consumer_splice_metadata_pipe); |
1226 | if (ret < 0) { | |
1227 | goto error_splice_pipe; | |
1228 | } | |
1229 | ||
1230 | return ctx; | |
3bd1e081 | 1231 | |
fb3a43a9 DG |
1232 | error_splice_pipe: |
1233 | utils_close_pipe(ctx->consumer_metadata_pipe); | |
1234 | error_metadata_pipe: | |
1235 | utils_close_pipe(ctx->consumer_thread_pipe); | |
3bd1e081 MD |
1236 | error_thread_pipe: |
1237 | for (i = 0; i < 2; i++) { | |
1238 | int err; | |
1239 | ||
1240 | err = close(ctx->consumer_should_quit[i]); | |
4c462e79 MD |
1241 | if (err) { |
1242 | PERROR("close"); | |
1243 | } | |
3bd1e081 | 1244 | } |
04fdd819 | 1245 | error_poll_fcntl: |
3bd1e081 MD |
1246 | error_quit_pipe: |
1247 | for (i = 0; i < 2; i++) { | |
1248 | int err; | |
1249 | ||
50f8ae69 | 1250 | err = close(ctx->consumer_data_pipe[i]); |
4c462e79 MD |
1251 | if (err) { |
1252 | PERROR("close"); | |
1253 | } | |
3bd1e081 MD |
1254 | } |
1255 | error_poll_pipe: | |
1256 | free(ctx); | |
1257 | error: | |
1258 | return NULL; | |
1259 | } | |
1260 | ||
1261 | /* | |
1262 | * Close all fds associated with the instance and free the context. | |
1263 | */ | |
1264 | void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx) | |
1265 | { | |
4c462e79 MD |
1266 | int ret; |
1267 | ||
ab1027f4 DG |
1268 | DBG("Consumer destroying it. Closing everything."); |
1269 | ||
4c462e79 MD |
1270 | ret = close(ctx->consumer_error_socket); |
1271 | if (ret) { | |
1272 | PERROR("close"); | |
1273 | } | |
1274 | ret = close(ctx->consumer_thread_pipe[0]); | |
1275 | if (ret) { | |
1276 | PERROR("close"); | |
1277 | } | |
1278 | ret = close(ctx->consumer_thread_pipe[1]); | |
1279 | if (ret) { | |
1280 | PERROR("close"); | |
1281 | } | |
50f8ae69 | 1282 | ret = close(ctx->consumer_data_pipe[0]); |
4c462e79 MD |
1283 | if (ret) { |
1284 | PERROR("close"); | |
1285 | } | |
50f8ae69 | 1286 | ret = close(ctx->consumer_data_pipe[1]); |
4c462e79 MD |
1287 | if (ret) { |
1288 | PERROR("close"); | |
1289 | } | |
1290 | ret = close(ctx->consumer_should_quit[0]); | |
1291 | if (ret) { | |
1292 | PERROR("close"); | |
1293 | } | |
1294 | ret = close(ctx->consumer_should_quit[1]); | |
1295 | if (ret) { | |
1296 | PERROR("close"); | |
1297 | } | |
fb3a43a9 DG |
1298 | utils_close_pipe(ctx->consumer_splice_metadata_pipe); |
1299 | ||
3bd1e081 MD |
1300 | unlink(ctx->consumer_command_sock_path); |
1301 | free(ctx); | |
1302 | } | |
1303 | ||
6197aea7 DG |
1304 | /* |
1305 | * Write the metadata stream id on the specified file descriptor. | |
1306 | */ | |
1307 | static int write_relayd_metadata_id(int fd, | |
1308 | struct lttng_consumer_stream *stream, | |
1d4dfdef DG |
1309 | struct consumer_relayd_sock_pair *relayd, |
1310 | unsigned long padding) | |
6197aea7 DG |
1311 | { |
1312 | int ret; | |
1d4dfdef | 1313 | struct lttcomm_relayd_metadata_payload hdr; |
6197aea7 | 1314 | |
1d4dfdef DG |
1315 | hdr.stream_id = htobe64(stream->relayd_stream_id); |
1316 | hdr.padding_size = htobe32(padding); | |
6197aea7 | 1317 | do { |
1d4dfdef | 1318 | ret = write(fd, (void *) &hdr, sizeof(hdr)); |
6197aea7 DG |
1319 | } while (ret < 0 && errno == EINTR); |
1320 | if (ret < 0) { | |
1321 | PERROR("write metadata stream id"); | |
1322 | goto end; | |
1323 | } | |
1d4dfdef DG |
1324 | DBG("Metadata stream id %" PRIu64 " with padding %lu written before data", |
1325 | stream->relayd_stream_id, padding); | |
6197aea7 DG |
1326 | |
1327 | end: | |
1328 | return ret; | |
1329 | } | |
1330 | ||
3bd1e081 | 1331 | /* |
09e26845 DG |
1332 | * Mmap the ring buffer, read it and write the data to the tracefile. This is a |
1333 | * core function for writing trace buffers to either the local filesystem or | |
1334 | * the network. | |
1335 | * | |
79d4ffb7 DG |
1336 | * It must be called with the stream lock held. |
1337 | * | |
09e26845 | 1338 | * Careful review MUST be put if any changes occur! |
3bd1e081 MD |
1339 | * |
1340 | * Returns the number of bytes written | |
1341 | */ | |
4078b776 | 1342 | ssize_t lttng_consumer_on_read_subbuffer_mmap( |
3bd1e081 | 1343 | struct lttng_consumer_local_data *ctx, |
1d4dfdef DG |
1344 | struct lttng_consumer_stream *stream, unsigned long len, |
1345 | unsigned long padding) | |
3bd1e081 | 1346 | { |
f02e1e8a DG |
1347 | unsigned long mmap_offset; |
1348 | ssize_t ret = 0, written = 0; | |
1349 | off_t orig_offset = stream->out_fd_offset; | |
1350 | /* Default is on the disk */ | |
1351 | int outfd = stream->out_fd; | |
f02e1e8a | 1352 | struct consumer_relayd_sock_pair *relayd = NULL; |
8994307f | 1353 | unsigned int relayd_hang_up = 0; |
f02e1e8a DG |
1354 | |
1355 | /* RCU lock for the relayd pointer */ | |
1356 | rcu_read_lock(); | |
1357 | ||
1358 | /* Flag that the current stream if set for network streaming. */ | |
1359 | if (stream->net_seq_idx != -1) { | |
1360 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1361 | if (relayd == NULL) { | |
1362 | goto end; | |
1363 | } | |
1364 | } | |
1365 | ||
1366 | /* get the offset inside the fd to mmap */ | |
3bd1e081 MD |
1367 | switch (consumer_data.type) { |
1368 | case LTTNG_CONSUMER_KERNEL: | |
f02e1e8a DG |
1369 | ret = kernctl_get_mmap_read_offset(stream->wait_fd, &mmap_offset); |
1370 | break; | |
7753dea8 MD |
1371 | case LTTNG_CONSUMER32_UST: |
1372 | case LTTNG_CONSUMER64_UST: | |
f02e1e8a DG |
1373 | ret = lttng_ustctl_get_mmap_read_offset(stream->chan->handle, |
1374 | stream->buf, &mmap_offset); | |
1375 | break; | |
3bd1e081 MD |
1376 | default: |
1377 | ERR("Unknown consumer_data type"); | |
1378 | assert(0); | |
1379 | } | |
f02e1e8a DG |
1380 | if (ret != 0) { |
1381 | errno = -ret; | |
1382 | PERROR("tracer ctl get_mmap_read_offset"); | |
1383 | written = ret; | |
1384 | goto end; | |
1385 | } | |
b9182dd9 | 1386 | |
f02e1e8a DG |
1387 | /* Handle stream on the relayd if the output is on the network */ |
1388 | if (relayd) { | |
1389 | unsigned long netlen = len; | |
1390 | ||
1391 | /* | |
1392 | * Lock the control socket for the complete duration of the function | |
1393 | * since from this point on we will use the socket. | |
1394 | */ | |
1395 | if (stream->metadata_flag) { | |
1396 | /* Metadata requires the control socket. */ | |
1397 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1d4dfdef | 1398 | netlen += sizeof(struct lttcomm_relayd_metadata_payload); |
f02e1e8a DG |
1399 | } |
1400 | ||
1d4dfdef | 1401 | ret = write_relayd_stream_header(stream, netlen, padding, relayd); |
f02e1e8a DG |
1402 | if (ret >= 0) { |
1403 | /* Use the returned socket. */ | |
1404 | outfd = ret; | |
1405 | ||
1406 | /* Write metadata stream id before payload */ | |
1407 | if (stream->metadata_flag) { | |
1d4dfdef | 1408 | ret = write_relayd_metadata_id(outfd, stream, relayd, padding); |
f02e1e8a | 1409 | if (ret < 0) { |
f02e1e8a | 1410 | written = ret; |
8994307f DG |
1411 | /* Socket operation failed. We consider the relayd dead */ |
1412 | if (ret == -EPIPE || ret == -EINVAL) { | |
1413 | relayd_hang_up = 1; | |
1414 | goto write_error; | |
1415 | } | |
f02e1e8a DG |
1416 | goto end; |
1417 | } | |
f02e1e8a | 1418 | } |
8994307f DG |
1419 | } else { |
1420 | /* Socket operation failed. We consider the relayd dead */ | |
1421 | if (ret == -EPIPE || ret == -EINVAL) { | |
1422 | relayd_hang_up = 1; | |
1423 | goto write_error; | |
1424 | } | |
1425 | /* Else, use the default set before which is the filesystem. */ | |
f02e1e8a | 1426 | } |
1d4dfdef DG |
1427 | } else { |
1428 | /* No streaming, we have to set the len with the full padding */ | |
1429 | len += padding; | |
f02e1e8a DG |
1430 | } |
1431 | ||
1432 | while (len > 0) { | |
1433 | do { | |
1434 | ret = write(outfd, stream->mmap_base + mmap_offset, len); | |
1435 | } while (ret < 0 && errno == EINTR); | |
1d4dfdef | 1436 | DBG("Consumer mmap write() ret %zd (len %lu)", ret, len); |
f02e1e8a DG |
1437 | if (ret < 0) { |
1438 | PERROR("Error in file write"); | |
1439 | if (written == 0) { | |
1440 | written = ret; | |
1441 | } | |
8994307f DG |
1442 | /* Socket operation failed. We consider the relayd dead */ |
1443 | if (errno == EPIPE || errno == EINVAL) { | |
1444 | relayd_hang_up = 1; | |
1445 | goto write_error; | |
1446 | } | |
f02e1e8a DG |
1447 | goto end; |
1448 | } else if (ret > len) { | |
77c7c900 | 1449 | PERROR("Error in file write (ret %zd > len %lu)", ret, len); |
f02e1e8a DG |
1450 | written += ret; |
1451 | goto end; | |
1452 | } else { | |
1453 | len -= ret; | |
1454 | mmap_offset += ret; | |
1455 | } | |
f02e1e8a DG |
1456 | |
1457 | /* This call is useless on a socket so better save a syscall. */ | |
1458 | if (!relayd) { | |
1459 | /* This won't block, but will start writeout asynchronously */ | |
1460 | lttng_sync_file_range(outfd, stream->out_fd_offset, ret, | |
1461 | SYNC_FILE_RANGE_WRITE); | |
1462 | stream->out_fd_offset += ret; | |
1463 | } | |
1464 | written += ret; | |
1465 | } | |
1466 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
1467 | ||
8994307f DG |
1468 | write_error: |
1469 | /* | |
1470 | * This is a special case that the relayd has closed its socket. Let's | |
1471 | * cleanup the relayd object and all associated streams. | |
1472 | */ | |
1473 | if (relayd && relayd_hang_up) { | |
1474 | cleanup_relayd(relayd, ctx); | |
1475 | } | |
1476 | ||
f02e1e8a DG |
1477 | end: |
1478 | /* Unlock only if ctrl socket used */ | |
1479 | if (relayd && stream->metadata_flag) { | |
1480 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1481 | } | |
1482 | ||
1483 | rcu_read_unlock(); | |
1484 | return written; | |
3bd1e081 MD |
1485 | } |
1486 | ||
1487 | /* | |
1488 | * Splice the data from the ring buffer to the tracefile. | |
1489 | * | |
79d4ffb7 DG |
1490 | * It must be called with the stream lock held. |
1491 | * | |
3bd1e081 MD |
1492 | * Returns the number of bytes spliced. |
1493 | */ | |
4078b776 | 1494 | ssize_t lttng_consumer_on_read_subbuffer_splice( |
3bd1e081 | 1495 | struct lttng_consumer_local_data *ctx, |
1d4dfdef DG |
1496 | struct lttng_consumer_stream *stream, unsigned long len, |
1497 | unsigned long padding) | |
3bd1e081 | 1498 | { |
f02e1e8a DG |
1499 | ssize_t ret = 0, written = 0, ret_splice = 0; |
1500 | loff_t offset = 0; | |
1501 | off_t orig_offset = stream->out_fd_offset; | |
1502 | int fd = stream->wait_fd; | |
1503 | /* Default is on the disk */ | |
1504 | int outfd = stream->out_fd; | |
f02e1e8a | 1505 | struct consumer_relayd_sock_pair *relayd = NULL; |
fb3a43a9 | 1506 | int *splice_pipe; |
8994307f | 1507 | unsigned int relayd_hang_up = 0; |
f02e1e8a | 1508 | |
3bd1e081 MD |
1509 | switch (consumer_data.type) { |
1510 | case LTTNG_CONSUMER_KERNEL: | |
f02e1e8a | 1511 | break; |
7753dea8 MD |
1512 | case LTTNG_CONSUMER32_UST: |
1513 | case LTTNG_CONSUMER64_UST: | |
f02e1e8a | 1514 | /* Not supported for user space tracing */ |
3bd1e081 MD |
1515 | return -ENOSYS; |
1516 | default: | |
1517 | ERR("Unknown consumer_data type"); | |
1518 | assert(0); | |
3bd1e081 MD |
1519 | } |
1520 | ||
f02e1e8a DG |
1521 | /* RCU lock for the relayd pointer */ |
1522 | rcu_read_lock(); | |
1523 | ||
1524 | /* Flag that the current stream if set for network streaming. */ | |
1525 | if (stream->net_seq_idx != -1) { | |
1526 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1527 | if (relayd == NULL) { | |
1528 | goto end; | |
1529 | } | |
1530 | } | |
1531 | ||
fb3a43a9 DG |
1532 | /* |
1533 | * Choose right pipe for splice. Metadata and trace data are handled by | |
1534 | * different threads hence the use of two pipes in order not to race or | |
1535 | * corrupt the written data. | |
1536 | */ | |
1537 | if (stream->metadata_flag) { | |
1538 | splice_pipe = ctx->consumer_splice_metadata_pipe; | |
1539 | } else { | |
1540 | splice_pipe = ctx->consumer_thread_pipe; | |
1541 | } | |
1542 | ||
f02e1e8a | 1543 | /* Write metadata stream id before payload */ |
1d4dfdef DG |
1544 | if (relayd) { |
1545 | int total_len = len; | |
f02e1e8a | 1546 | |
1d4dfdef DG |
1547 | if (stream->metadata_flag) { |
1548 | /* | |
1549 | * Lock the control socket for the complete duration of the function | |
1550 | * since from this point on we will use the socket. | |
1551 | */ | |
1552 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1553 | ||
1554 | ret = write_relayd_metadata_id(splice_pipe[1], stream, relayd, | |
1555 | padding); | |
1556 | if (ret < 0) { | |
1557 | written = ret; | |
8994307f DG |
1558 | /* Socket operation failed. We consider the relayd dead */ |
1559 | if (ret == -EBADF) { | |
1560 | WARN("Remote relayd disconnected. Stopping"); | |
1561 | relayd_hang_up = 1; | |
1562 | goto write_error; | |
1563 | } | |
1d4dfdef DG |
1564 | goto end; |
1565 | } | |
1566 | ||
1567 | total_len += sizeof(struct lttcomm_relayd_metadata_payload); | |
1568 | } | |
1569 | ||
1570 | ret = write_relayd_stream_header(stream, total_len, padding, relayd); | |
1571 | if (ret >= 0) { | |
1572 | /* Use the returned socket. */ | |
1573 | outfd = ret; | |
1574 | } else { | |
8994307f DG |
1575 | /* Socket operation failed. We consider the relayd dead */ |
1576 | if (ret == -EBADF) { | |
1577 | WARN("Remote relayd disconnected. Stopping"); | |
1578 | relayd_hang_up = 1; | |
1579 | goto write_error; | |
1580 | } | |
f02e1e8a DG |
1581 | goto end; |
1582 | } | |
1d4dfdef DG |
1583 | } else { |
1584 | /* No streaming, we have to set the len with the full padding */ | |
1585 | len += padding; | |
f02e1e8a DG |
1586 | } |
1587 | ||
1588 | while (len > 0) { | |
1d4dfdef DG |
1589 | DBG("splice chan to pipe offset %lu of len %lu (fd : %d, pipe: %d)", |
1590 | (unsigned long)offset, len, fd, splice_pipe[1]); | |
fb3a43a9 | 1591 | ret_splice = splice(fd, &offset, splice_pipe[1], NULL, len, |
f02e1e8a DG |
1592 | SPLICE_F_MOVE | SPLICE_F_MORE); |
1593 | DBG("splice chan to pipe, ret %zd", ret_splice); | |
1594 | if (ret_splice < 0) { | |
1595 | PERROR("Error in relay splice"); | |
1596 | if (written == 0) { | |
1597 | written = ret_splice; | |
1598 | } | |
1599 | ret = errno; | |
1600 | goto splice_error; | |
1601 | } | |
1602 | ||
1603 | /* Handle stream on the relayd if the output is on the network */ | |
1604 | if (relayd) { | |
1605 | if (stream->metadata_flag) { | |
1d4dfdef DG |
1606 | size_t metadata_payload_size = |
1607 | sizeof(struct lttcomm_relayd_metadata_payload); | |
1608 | ||
f02e1e8a | 1609 | /* Update counter to fit the spliced data */ |
1d4dfdef DG |
1610 | ret_splice += metadata_payload_size; |
1611 | len += metadata_payload_size; | |
f02e1e8a DG |
1612 | /* |
1613 | * We do this so the return value can match the len passed as | |
1614 | * argument to this function. | |
1615 | */ | |
1d4dfdef | 1616 | written -= metadata_payload_size; |
f02e1e8a DG |
1617 | } |
1618 | } | |
1619 | ||
1620 | /* Splice data out */ | |
fb3a43a9 | 1621 | ret_splice = splice(splice_pipe[0], NULL, outfd, NULL, |
f02e1e8a | 1622 | ret_splice, SPLICE_F_MOVE | SPLICE_F_MORE); |
1d4dfdef | 1623 | DBG("Consumer splice pipe to file, ret %zd", ret_splice); |
f02e1e8a DG |
1624 | if (ret_splice < 0) { |
1625 | PERROR("Error in file splice"); | |
1626 | if (written == 0) { | |
1627 | written = ret_splice; | |
1628 | } | |
8994307f | 1629 | /* Socket operation failed. We consider the relayd dead */ |
00c8752b | 1630 | if (errno == EBADF || errno == EPIPE) { |
8994307f DG |
1631 | WARN("Remote relayd disconnected. Stopping"); |
1632 | relayd_hang_up = 1; | |
1633 | goto write_error; | |
1634 | } | |
f02e1e8a DG |
1635 | ret = errno; |
1636 | goto splice_error; | |
1637 | } else if (ret_splice > len) { | |
1638 | errno = EINVAL; | |
1639 | PERROR("Wrote more data than requested %zd (len: %lu)", | |
1640 | ret_splice, len); | |
1641 | written += ret_splice; | |
1642 | ret = errno; | |
1643 | goto splice_error; | |
1644 | } | |
1645 | len -= ret_splice; | |
1646 | ||
1647 | /* This call is useless on a socket so better save a syscall. */ | |
1648 | if (!relayd) { | |
1649 | /* This won't block, but will start writeout asynchronously */ | |
1650 | lttng_sync_file_range(outfd, stream->out_fd_offset, ret_splice, | |
1651 | SYNC_FILE_RANGE_WRITE); | |
1652 | stream->out_fd_offset += ret_splice; | |
1653 | } | |
1654 | written += ret_splice; | |
1655 | } | |
1656 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
1657 | ||
1658 | ret = ret_splice; | |
1659 | ||
1660 | goto end; | |
1661 | ||
8994307f DG |
1662 | write_error: |
1663 | /* | |
1664 | * This is a special case that the relayd has closed its socket. Let's | |
1665 | * cleanup the relayd object and all associated streams. | |
1666 | */ | |
1667 | if (relayd && relayd_hang_up) { | |
1668 | cleanup_relayd(relayd, ctx); | |
1669 | /* Skip splice error so the consumer does not fail */ | |
1670 | goto end; | |
1671 | } | |
1672 | ||
f02e1e8a DG |
1673 | splice_error: |
1674 | /* send the appropriate error description to sessiond */ | |
1675 | switch (ret) { | |
f02e1e8a | 1676 | case EINVAL: |
f73fabfd | 1677 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_EINVAL); |
f02e1e8a DG |
1678 | break; |
1679 | case ENOMEM: | |
f73fabfd | 1680 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ENOMEM); |
f02e1e8a DG |
1681 | break; |
1682 | case ESPIPE: | |
f73fabfd | 1683 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ESPIPE); |
f02e1e8a DG |
1684 | break; |
1685 | } | |
1686 | ||
1687 | end: | |
1688 | if (relayd && stream->metadata_flag) { | |
1689 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1690 | } | |
1691 | ||
1692 | rcu_read_unlock(); | |
1693 | return written; | |
3bd1e081 MD |
1694 | } |
1695 | ||
1696 | /* | |
1697 | * Take a snapshot for a specific fd | |
1698 | * | |
1699 | * Returns 0 on success, < 0 on error | |
1700 | */ | |
1701 | int lttng_consumer_take_snapshot(struct lttng_consumer_local_data *ctx, | |
1702 | struct lttng_consumer_stream *stream) | |
1703 | { | |
1704 | switch (consumer_data.type) { | |
1705 | case LTTNG_CONSUMER_KERNEL: | |
1706 | return lttng_kconsumer_take_snapshot(ctx, stream); | |
7753dea8 MD |
1707 | case LTTNG_CONSUMER32_UST: |
1708 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1709 | return lttng_ustconsumer_take_snapshot(ctx, stream); |
1710 | default: | |
1711 | ERR("Unknown consumer_data type"); | |
1712 | assert(0); | |
1713 | return -ENOSYS; | |
1714 | } | |
1715 | ||
1716 | } | |
1717 | ||
1718 | /* | |
1719 | * Get the produced position | |
1720 | * | |
1721 | * Returns 0 on success, < 0 on error | |
1722 | */ | |
1723 | int lttng_consumer_get_produced_snapshot( | |
1724 | struct lttng_consumer_local_data *ctx, | |
1725 | struct lttng_consumer_stream *stream, | |
1726 | unsigned long *pos) | |
1727 | { | |
1728 | switch (consumer_data.type) { | |
1729 | case LTTNG_CONSUMER_KERNEL: | |
1730 | return lttng_kconsumer_get_produced_snapshot(ctx, stream, pos); | |
7753dea8 MD |
1731 | case LTTNG_CONSUMER32_UST: |
1732 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1733 | return lttng_ustconsumer_get_produced_snapshot(ctx, stream, pos); |
1734 | default: | |
1735 | ERR("Unknown consumer_data type"); | |
1736 | assert(0); | |
1737 | return -ENOSYS; | |
1738 | } | |
1739 | } | |
1740 | ||
1741 | int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, | |
1742 | int sock, struct pollfd *consumer_sockpoll) | |
1743 | { | |
1744 | switch (consumer_data.type) { | |
1745 | case LTTNG_CONSUMER_KERNEL: | |
1746 | return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
7753dea8 MD |
1747 | case LTTNG_CONSUMER32_UST: |
1748 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1749 | return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll); |
1750 | default: | |
1751 | ERR("Unknown consumer_data type"); | |
1752 | assert(0); | |
1753 | return -ENOSYS; | |
1754 | } | |
1755 | } | |
1756 | ||
43c34bc3 DG |
1757 | /* |
1758 | * Iterate over all streams of the hashtable and free them properly. | |
1759 | * | |
1760 | * WARNING: *MUST* be used with data stream only. | |
1761 | */ | |
1762 | static void destroy_data_stream_ht(struct lttng_ht *ht) | |
1763 | { | |
43c34bc3 DG |
1764 | struct lttng_ht_iter iter; |
1765 | struct lttng_consumer_stream *stream; | |
1766 | ||
1767 | if (ht == NULL) { | |
1768 | return; | |
1769 | } | |
1770 | ||
1771 | rcu_read_lock(); | |
1772 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { | |
5c540210 DG |
1773 | /* |
1774 | * Ignore return value since we are currently cleaning up so any error | |
1775 | * can't be handled. | |
1776 | */ | |
1777 | (void) consumer_del_stream(stream, ht); | |
43c34bc3 DG |
1778 | } |
1779 | rcu_read_unlock(); | |
1780 | ||
1781 | lttng_ht_destroy(ht); | |
1782 | } | |
1783 | ||
fb3a43a9 | 1784 | /* |
f724d81e | 1785 | * Iterate over all streams of the hashtable and free them properly. |
e316aad5 DG |
1786 | * |
1787 | * XXX: Should not be only for metadata stream or else use an other name. | |
fb3a43a9 DG |
1788 | */ |
1789 | static void destroy_stream_ht(struct lttng_ht *ht) | |
1790 | { | |
fb3a43a9 DG |
1791 | struct lttng_ht_iter iter; |
1792 | struct lttng_consumer_stream *stream; | |
1793 | ||
1794 | if (ht == NULL) { | |
1795 | return; | |
1796 | } | |
1797 | ||
d09e1200 | 1798 | rcu_read_lock(); |
58b1f425 | 1799 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { |
5c540210 DG |
1800 | /* |
1801 | * Ignore return value since we are currently cleaning up so any error | |
1802 | * can't be handled. | |
1803 | */ | |
1804 | (void) consumer_del_metadata_stream(stream, ht); | |
fb3a43a9 | 1805 | } |
d09e1200 | 1806 | rcu_read_unlock(); |
fb3a43a9 DG |
1807 | |
1808 | lttng_ht_destroy(ht); | |
1809 | } | |
1810 | ||
1811 | /* | |
1812 | * Clean up a metadata stream and free its memory. | |
1813 | */ | |
e316aad5 DG |
1814 | void consumer_del_metadata_stream(struct lttng_consumer_stream *stream, |
1815 | struct lttng_ht *ht) | |
fb3a43a9 DG |
1816 | { |
1817 | int ret; | |
e316aad5 DG |
1818 | struct lttng_ht_iter iter; |
1819 | struct lttng_consumer_channel *free_chan = NULL; | |
fb3a43a9 DG |
1820 | struct consumer_relayd_sock_pair *relayd; |
1821 | ||
1822 | assert(stream); | |
1823 | /* | |
1824 | * This call should NEVER receive regular stream. It must always be | |
1825 | * metadata stream and this is crucial for data structure synchronization. | |
1826 | */ | |
1827 | assert(stream->metadata_flag); | |
1828 | ||
e316aad5 DG |
1829 | DBG3("Consumer delete metadata stream %d", stream->wait_fd); |
1830 | ||
1831 | if (ht == NULL) { | |
1832 | /* Means the stream was allocated but not successfully added */ | |
1833 | goto free_stream; | |
1834 | } | |
1835 | ||
74251bb8 | 1836 | pthread_mutex_lock(&consumer_data.lock); |
8994307f DG |
1837 | pthread_mutex_lock(&stream->lock); |
1838 | ||
fb3a43a9 DG |
1839 | switch (consumer_data.type) { |
1840 | case LTTNG_CONSUMER_KERNEL: | |
1841 | if (stream->mmap_base != NULL) { | |
1842 | ret = munmap(stream->mmap_base, stream->mmap_len); | |
1843 | if (ret != 0) { | |
1844 | PERROR("munmap metadata stream"); | |
1845 | } | |
1846 | } | |
1847 | break; | |
1848 | case LTTNG_CONSUMER32_UST: | |
1849 | case LTTNG_CONSUMER64_UST: | |
1850 | lttng_ustconsumer_del_stream(stream); | |
1851 | break; | |
1852 | default: | |
1853 | ERR("Unknown consumer_data type"); | |
1854 | assert(0); | |
e316aad5 | 1855 | goto end; |
fb3a43a9 | 1856 | } |
fb3a43a9 | 1857 | |
c869f647 | 1858 | rcu_read_lock(); |
58b1f425 | 1859 | iter.iter.node = &stream->node.node; |
c869f647 DG |
1860 | ret = lttng_ht_del(ht, &iter); |
1861 | assert(!ret); | |
ca22feea DG |
1862 | |
1863 | /* Remove node session id from the consumer_data stream ht */ | |
1864 | iter.iter.node = &stream->node_session_id.node; | |
1865 | ret = lttng_ht_del(consumer_data.stream_list_ht, &iter); | |
1866 | assert(!ret); | |
c869f647 DG |
1867 | rcu_read_unlock(); |
1868 | ||
fb3a43a9 DG |
1869 | if (stream->out_fd >= 0) { |
1870 | ret = close(stream->out_fd); | |
1871 | if (ret) { | |
1872 | PERROR("close"); | |
1873 | } | |
1874 | } | |
1875 | ||
1876 | if (stream->wait_fd >= 0 && !stream->wait_fd_is_copy) { | |
1877 | ret = close(stream->wait_fd); | |
1878 | if (ret) { | |
1879 | PERROR("close"); | |
1880 | } | |
1881 | } | |
1882 | ||
1883 | if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) { | |
1884 | ret = close(stream->shm_fd); | |
1885 | if (ret) { | |
1886 | PERROR("close"); | |
1887 | } | |
1888 | } | |
1889 | ||
1890 | /* Check and cleanup relayd */ | |
1891 | rcu_read_lock(); | |
1892 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1893 | if (relayd != NULL) { | |
1894 | uatomic_dec(&relayd->refcount); | |
1895 | assert(uatomic_read(&relayd->refcount) >= 0); | |
1896 | ||
1897 | /* Closing streams requires to lock the control socket. */ | |
1898 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1899 | ret = relayd_send_close_stream(&relayd->control_sock, | |
1900 | stream->relayd_stream_id, stream->next_net_seq_num - 1); | |
1901 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1902 | if (ret < 0) { | |
1903 | DBG("Unable to close stream on the relayd. Continuing"); | |
1904 | /* | |
1905 | * Continue here. There is nothing we can do for the relayd. | |
1906 | * Chances are that the relayd has closed the socket so we just | |
1907 | * continue cleaning up. | |
1908 | */ | |
1909 | } | |
1910 | ||
1911 | /* Both conditions are met, we destroy the relayd. */ | |
1912 | if (uatomic_read(&relayd->refcount) == 0 && | |
1913 | uatomic_read(&relayd->destroy_flag)) { | |
d09e1200 | 1914 | destroy_relayd(relayd); |
fb3a43a9 DG |
1915 | } |
1916 | } | |
1917 | rcu_read_unlock(); | |
1918 | ||
1919 | /* Atomically decrement channel refcount since other threads can use it. */ | |
1920 | uatomic_dec(&stream->chan->refcount); | |
c30aaa51 MD |
1921 | if (!uatomic_read(&stream->chan->refcount) |
1922 | && !uatomic_read(&stream->chan->nb_init_streams)) { | |
1923 | /* Go for channel deletion! */ | |
e316aad5 | 1924 | free_chan = stream->chan; |
fb3a43a9 DG |
1925 | } |
1926 | ||
e316aad5 | 1927 | end: |
8994307f | 1928 | pthread_mutex_unlock(&stream->lock); |
74251bb8 | 1929 | pthread_mutex_unlock(&consumer_data.lock); |
e316aad5 DG |
1930 | |
1931 | if (free_chan) { | |
1932 | consumer_del_channel(free_chan); | |
1933 | } | |
1934 | ||
1935 | free_stream: | |
58b1f425 | 1936 | call_rcu(&stream->node.head, consumer_free_stream); |
fb3a43a9 DG |
1937 | } |
1938 | ||
1939 | /* | |
1940 | * Action done with the metadata stream when adding it to the consumer internal | |
1941 | * data structures to handle it. | |
1942 | */ | |
e316aad5 DG |
1943 | static int consumer_add_metadata_stream(struct lttng_consumer_stream *stream, |
1944 | struct lttng_ht *ht) | |
fb3a43a9 | 1945 | { |
e316aad5 | 1946 | int ret = 0; |
fb3a43a9 | 1947 | struct consumer_relayd_sock_pair *relayd; |
76082088 DG |
1948 | struct lttng_ht_iter iter; |
1949 | struct lttng_ht_node_ulong *node; | |
fb3a43a9 | 1950 | |
e316aad5 DG |
1951 | assert(stream); |
1952 | assert(ht); | |
1953 | ||
1954 | DBG3("Adding metadata stream %d to hash table", stream->wait_fd); | |
1955 | ||
1956 | pthread_mutex_lock(&consumer_data.lock); | |
2e818a6a | 1957 | pthread_mutex_lock(&stream->lock); |
e316aad5 | 1958 | |
e316aad5 DG |
1959 | /* |
1960 | * From here, refcounts are updated so be _careful_ when returning an error | |
1961 | * after this point. | |
1962 | */ | |
1963 | ||
fb3a43a9 | 1964 | rcu_read_lock(); |
76082088 DG |
1965 | |
1966 | /* | |
1967 | * Lookup the stream just to make sure it does not exist in our internal | |
1968 | * state. This should NEVER happen. | |
1969 | */ | |
1970 | lttng_ht_lookup(ht, (void *)((unsigned long) stream->wait_fd), &iter); | |
1971 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1972 | assert(!node); | |
1973 | ||
e316aad5 | 1974 | /* Find relayd and, if one is found, increment refcount. */ |
fb3a43a9 DG |
1975 | relayd = consumer_find_relayd(stream->net_seq_idx); |
1976 | if (relayd != NULL) { | |
1977 | uatomic_inc(&relayd->refcount); | |
1978 | } | |
e316aad5 DG |
1979 | |
1980 | /* Update channel refcount once added without error(s). */ | |
1981 | uatomic_inc(&stream->chan->refcount); | |
1982 | ||
1983 | /* | |
1984 | * When nb_init_streams reaches 0, we don't need to trigger any action in | |
1985 | * terms of destroying the associated channel, because the action that | |
1986 | * causes the count to become 0 also causes a stream to be added. The | |
1987 | * channel deletion will thus be triggered by the following removal of this | |
1988 | * stream. | |
1989 | */ | |
1990 | if (uatomic_read(&stream->chan->nb_init_streams) > 0) { | |
1991 | uatomic_dec(&stream->chan->nb_init_streams); | |
1992 | } | |
1993 | ||
58b1f425 | 1994 | lttng_ht_add_unique_ulong(ht, &stream->node); |
ca22feea DG |
1995 | |
1996 | /* | |
1997 | * Add stream to the stream_list_ht of the consumer data. No need to steal | |
1998 | * the key since the HT does not use it and we allow to add redundant keys | |
1999 | * into this table. | |
2000 | */ | |
2001 | lttng_ht_add_ulong(consumer_data.stream_list_ht, &stream->node_session_id); | |
2002 | ||
fb3a43a9 | 2003 | rcu_read_unlock(); |
e316aad5 | 2004 | |
2e818a6a | 2005 | pthread_mutex_unlock(&stream->lock); |
e316aad5 DG |
2006 | pthread_mutex_unlock(&consumer_data.lock); |
2007 | return ret; | |
fb3a43a9 DG |
2008 | } |
2009 | ||
8994307f DG |
2010 | /* |
2011 | * Delete data stream that are flagged for deletion (endpoint_status). | |
2012 | */ | |
2013 | static void validate_endpoint_status_data_stream(void) | |
2014 | { | |
2015 | struct lttng_ht_iter iter; | |
2016 | struct lttng_consumer_stream *stream; | |
2017 | ||
2018 | DBG("Consumer delete flagged data stream"); | |
2019 | ||
2020 | rcu_read_lock(); | |
2021 | cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) { | |
2022 | /* Validate delete flag of the stream */ | |
79d4ffb7 | 2023 | if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) { |
8994307f DG |
2024 | continue; |
2025 | } | |
2026 | /* Delete it right now */ | |
2027 | consumer_del_stream(stream, data_ht); | |
2028 | } | |
2029 | rcu_read_unlock(); | |
2030 | } | |
2031 | ||
2032 | /* | |
2033 | * Delete metadata stream that are flagged for deletion (endpoint_status). | |
2034 | */ | |
2035 | static void validate_endpoint_status_metadata_stream( | |
2036 | struct lttng_poll_event *pollset) | |
2037 | { | |
2038 | struct lttng_ht_iter iter; | |
2039 | struct lttng_consumer_stream *stream; | |
2040 | ||
2041 | DBG("Consumer delete flagged metadata stream"); | |
2042 | ||
2043 | assert(pollset); | |
2044 | ||
2045 | rcu_read_lock(); | |
2046 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) { | |
2047 | /* Validate delete flag of the stream */ | |
79d4ffb7 | 2048 | if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) { |
8994307f DG |
2049 | continue; |
2050 | } | |
2051 | /* | |
2052 | * Remove from pollset so the metadata thread can continue without | |
2053 | * blocking on a deleted stream. | |
2054 | */ | |
2055 | lttng_poll_del(pollset, stream->wait_fd); | |
2056 | ||
2057 | /* Delete it right now */ | |
2058 | consumer_del_metadata_stream(stream, metadata_ht); | |
2059 | } | |
2060 | rcu_read_unlock(); | |
2061 | } | |
2062 | ||
fb3a43a9 DG |
2063 | /* |
2064 | * Thread polls on metadata file descriptor and write them on disk or on the | |
2065 | * network. | |
2066 | */ | |
7d980def | 2067 | void *consumer_thread_metadata_poll(void *data) |
fb3a43a9 DG |
2068 | { |
2069 | int ret, i, pollfd; | |
2070 | uint32_t revents, nb_fd; | |
e316aad5 | 2071 | struct lttng_consumer_stream *stream = NULL; |
fb3a43a9 DG |
2072 | struct lttng_ht_iter iter; |
2073 | struct lttng_ht_node_ulong *node; | |
fb3a43a9 DG |
2074 | struct lttng_poll_event events; |
2075 | struct lttng_consumer_local_data *ctx = data; | |
2076 | ssize_t len; | |
2077 | ||
2078 | rcu_register_thread(); | |
2079 | ||
04bb2b64 DG |
2080 | metadata_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2081 | if (!metadata_ht) { | |
2082 | /* ENOMEM at this point. Better to bail out. */ | |
2083 | goto error; | |
2084 | } | |
2085 | ||
fb3a43a9 DG |
2086 | DBG("Thread metadata poll started"); |
2087 | ||
fb3a43a9 DG |
2088 | /* Size is set to 1 for the consumer_metadata pipe */ |
2089 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
2090 | if (ret < 0) { | |
2091 | ERR("Poll set creation failed"); | |
2092 | goto end; | |
2093 | } | |
2094 | ||
2095 | ret = lttng_poll_add(&events, ctx->consumer_metadata_pipe[0], LPOLLIN); | |
2096 | if (ret < 0) { | |
2097 | goto end; | |
2098 | } | |
2099 | ||
2100 | /* Main loop */ | |
2101 | DBG("Metadata main loop started"); | |
2102 | ||
2103 | while (1) { | |
fb3a43a9 | 2104 | /* Only the metadata pipe is set */ |
d21b0d71 | 2105 | if (LTTNG_POLL_GETNB(&events) == 0 && consumer_quit == 1) { |
fb3a43a9 DG |
2106 | goto end; |
2107 | } | |
2108 | ||
2109 | restart: | |
d21b0d71 | 2110 | DBG("Metadata poll wait with %d fd(s)", LTTNG_POLL_GETNB(&events)); |
fb3a43a9 DG |
2111 | ret = lttng_poll_wait(&events, -1); |
2112 | DBG("Metadata event catched in thread"); | |
2113 | if (ret < 0) { | |
2114 | if (errno == EINTR) { | |
e316aad5 | 2115 | ERR("Poll EINTR catched"); |
fb3a43a9 DG |
2116 | goto restart; |
2117 | } | |
2118 | goto error; | |
2119 | } | |
2120 | ||
0d9c5d77 DG |
2121 | nb_fd = ret; |
2122 | ||
e316aad5 | 2123 | /* From here, the event is a metadata wait fd */ |
fb3a43a9 DG |
2124 | for (i = 0; i < nb_fd; i++) { |
2125 | revents = LTTNG_POLL_GETEV(&events, i); | |
2126 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2127 | ||
e316aad5 DG |
2128 | /* Just don't waste time if no returned events for the fd */ |
2129 | if (!revents) { | |
2130 | continue; | |
2131 | } | |
2132 | ||
fb3a43a9 | 2133 | if (pollfd == ctx->consumer_metadata_pipe[0]) { |
4adabd61 | 2134 | if (revents & (LPOLLERR | LPOLLHUP )) { |
fb3a43a9 DG |
2135 | DBG("Metadata thread pipe hung up"); |
2136 | /* | |
2137 | * Remove the pipe from the poll set and continue the loop | |
2138 | * since their might be data to consume. | |
2139 | */ | |
2140 | lttng_poll_del(&events, ctx->consumer_metadata_pipe[0]); | |
f66c074c DG |
2141 | ret = close(ctx->consumer_metadata_pipe[0]); |
2142 | if (ret < 0) { | |
2143 | PERROR("close metadata pipe"); | |
2144 | } | |
fb3a43a9 DG |
2145 | continue; |
2146 | } else if (revents & LPOLLIN) { | |
fb3a43a9 | 2147 | do { |
633d0084 DG |
2148 | /* Get the stream pointer received */ |
2149 | ret = read(pollfd, &stream, sizeof(stream)); | |
fb3a43a9 | 2150 | } while (ret < 0 && errno == EINTR); |
633d0084 DG |
2151 | if (ret < 0 || |
2152 | ret < sizeof(struct lttng_consumer_stream *)) { | |
fb3a43a9 | 2153 | PERROR("read metadata stream"); |
fb3a43a9 DG |
2154 | /* |
2155 | * Let's continue here and hope we can still work | |
2156 | * without stopping the consumer. XXX: Should we? | |
2157 | */ | |
2158 | continue; | |
2159 | } | |
2160 | ||
8994307f DG |
2161 | /* A NULL stream means that the state has changed. */ |
2162 | if (stream == NULL) { | |
2163 | /* Check for deleted streams. */ | |
2164 | validate_endpoint_status_metadata_stream(&events); | |
2165 | continue; | |
2166 | } | |
2167 | ||
fb3a43a9 DG |
2168 | DBG("Adding metadata stream %d to poll set", |
2169 | stream->wait_fd); | |
2170 | ||
e316aad5 DG |
2171 | ret = consumer_add_metadata_stream(stream, metadata_ht); |
2172 | if (ret) { | |
2173 | ERR("Unable to add metadata stream"); | |
2174 | /* Stream was not setup properly. Continuing. */ | |
2175 | consumer_del_metadata_stream(stream, NULL); | |
2176 | continue; | |
2177 | } | |
fb3a43a9 DG |
2178 | |
2179 | /* Add metadata stream to the global poll events list */ | |
2180 | lttng_poll_add(&events, stream->wait_fd, | |
2181 | LPOLLIN | LPOLLPRI); | |
fb3a43a9 DG |
2182 | } |
2183 | ||
e316aad5 | 2184 | /* Handle other stream */ |
fb3a43a9 DG |
2185 | continue; |
2186 | } | |
2187 | ||
d09e1200 | 2188 | rcu_read_lock(); |
fb3a43a9 DG |
2189 | lttng_ht_lookup(metadata_ht, (void *)((unsigned long) pollfd), |
2190 | &iter); | |
2191 | node = lttng_ht_iter_get_node_ulong(&iter); | |
e316aad5 | 2192 | assert(node); |
fb3a43a9 DG |
2193 | |
2194 | stream = caa_container_of(node, struct lttng_consumer_stream, | |
58b1f425 | 2195 | node); |
fb3a43a9 | 2196 | |
e316aad5 | 2197 | /* Check for error event */ |
4adabd61 | 2198 | if (revents & (LPOLLERR | LPOLLHUP)) { |
e316aad5 | 2199 | DBG("Metadata fd %d is hup|err.", pollfd); |
fb3a43a9 DG |
2200 | if (!stream->hangup_flush_done |
2201 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
2202 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
2203 | DBG("Attempting to flush and consume the UST buffers"); | |
2204 | lttng_ustconsumer_on_stream_hangup(stream); | |
2205 | ||
2206 | /* We just flushed the stream now read it. */ | |
4bb94b75 DG |
2207 | do { |
2208 | len = ctx->on_buffer_ready(stream, ctx); | |
2209 | /* | |
2210 | * We don't check the return value here since if we get | |
2211 | * a negative len, it means an error occured thus we | |
2212 | * simply remove it from the poll set and free the | |
2213 | * stream. | |
2214 | */ | |
2215 | } while (len > 0); | |
fb3a43a9 DG |
2216 | } |
2217 | ||
fb3a43a9 | 2218 | lttng_poll_del(&events, stream->wait_fd); |
e316aad5 DG |
2219 | /* |
2220 | * This call update the channel states, closes file descriptors | |
2221 | * and securely free the stream. | |
2222 | */ | |
2223 | consumer_del_metadata_stream(stream, metadata_ht); | |
2224 | } else if (revents & (LPOLLIN | LPOLLPRI)) { | |
2225 | /* Get the data out of the metadata file descriptor */ | |
2226 | DBG("Metadata available on fd %d", pollfd); | |
2227 | assert(stream->wait_fd == pollfd); | |
2228 | ||
2229 | len = ctx->on_buffer_ready(stream, ctx); | |
2230 | /* It's ok to have an unavailable sub-buffer */ | |
b64403e3 | 2231 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2232 | /* Clean up stream from consumer and free it. */ |
2233 | lttng_poll_del(&events, stream->wait_fd); | |
2234 | consumer_del_metadata_stream(stream, metadata_ht); | |
e316aad5 DG |
2235 | } else if (len > 0) { |
2236 | stream->data_read = 1; | |
2237 | } | |
fb3a43a9 | 2238 | } |
e316aad5 DG |
2239 | |
2240 | /* Release RCU lock for the stream looked up */ | |
d09e1200 | 2241 | rcu_read_unlock(); |
fb3a43a9 DG |
2242 | } |
2243 | } | |
2244 | ||
2245 | error: | |
2246 | end: | |
2247 | DBG("Metadata poll thread exiting"); | |
2248 | lttng_poll_clean(&events); | |
2249 | ||
04bb2b64 | 2250 | destroy_stream_ht(metadata_ht); |
fb3a43a9 DG |
2251 | |
2252 | rcu_unregister_thread(); | |
2253 | return NULL; | |
2254 | } | |
2255 | ||
3bd1e081 | 2256 | /* |
e4421fec | 2257 | * This thread polls the fds in the set to consume the data and write |
3bd1e081 MD |
2258 | * it to tracefile if necessary. |
2259 | */ | |
7d980def | 2260 | void *consumer_thread_data_poll(void *data) |
3bd1e081 MD |
2261 | { |
2262 | int num_rdy, num_hup, high_prio, ret, i; | |
2263 | struct pollfd *pollfd = NULL; | |
2264 | /* local view of the streams */ | |
c869f647 | 2265 | struct lttng_consumer_stream **local_stream = NULL, *new_stream = NULL; |
3bd1e081 MD |
2266 | /* local view of consumer_data.fds_count */ |
2267 | int nb_fd = 0; | |
3bd1e081 | 2268 | struct lttng_consumer_local_data *ctx = data; |
00e2e675 | 2269 | ssize_t len; |
3bd1e081 | 2270 | |
e7b994a3 DG |
2271 | rcu_register_thread(); |
2272 | ||
43c34bc3 DG |
2273 | data_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2274 | if (data_ht == NULL) { | |
04bb2b64 | 2275 | /* ENOMEM at this point. Better to bail out. */ |
43c34bc3 DG |
2276 | goto end; |
2277 | } | |
2278 | ||
effcf122 | 2279 | local_stream = zmalloc(sizeof(struct lttng_consumer_stream)); |
3bd1e081 MD |
2280 | |
2281 | while (1) { | |
2282 | high_prio = 0; | |
2283 | num_hup = 0; | |
2284 | ||
2285 | /* | |
e4421fec | 2286 | * the fds set has been updated, we need to update our |
3bd1e081 MD |
2287 | * local array as well |
2288 | */ | |
2289 | pthread_mutex_lock(&consumer_data.lock); | |
2290 | if (consumer_data.need_update) { | |
2291 | if (pollfd != NULL) { | |
2292 | free(pollfd); | |
2293 | pollfd = NULL; | |
2294 | } | |
2295 | if (local_stream != NULL) { | |
2296 | free(local_stream); | |
2297 | local_stream = NULL; | |
2298 | } | |
2299 | ||
50f8ae69 | 2300 | /* allocate for all fds + 1 for the consumer_data_pipe */ |
effcf122 | 2301 | pollfd = zmalloc((consumer_data.stream_count + 1) * sizeof(struct pollfd)); |
3bd1e081 | 2302 | if (pollfd == NULL) { |
7a57cf92 | 2303 | PERROR("pollfd malloc"); |
3bd1e081 MD |
2304 | pthread_mutex_unlock(&consumer_data.lock); |
2305 | goto end; | |
2306 | } | |
2307 | ||
50f8ae69 | 2308 | /* allocate for all fds + 1 for the consumer_data_pipe */ |
effcf122 | 2309 | local_stream = zmalloc((consumer_data.stream_count + 1) * |
3bd1e081 MD |
2310 | sizeof(struct lttng_consumer_stream)); |
2311 | if (local_stream == NULL) { | |
7a57cf92 | 2312 | PERROR("local_stream malloc"); |
3bd1e081 MD |
2313 | pthread_mutex_unlock(&consumer_data.lock); |
2314 | goto end; | |
2315 | } | |
43c34bc3 DG |
2316 | ret = consumer_update_poll_array(ctx, &pollfd, local_stream, |
2317 | data_ht); | |
3bd1e081 MD |
2318 | if (ret < 0) { |
2319 | ERR("Error in allocating pollfd or local_outfds"); | |
f73fabfd | 2320 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
2321 | pthread_mutex_unlock(&consumer_data.lock); |
2322 | goto end; | |
2323 | } | |
2324 | nb_fd = ret; | |
2325 | consumer_data.need_update = 0; | |
2326 | } | |
2327 | pthread_mutex_unlock(&consumer_data.lock); | |
2328 | ||
4078b776 MD |
2329 | /* No FDs and consumer_quit, consumer_cleanup the thread */ |
2330 | if (nb_fd == 0 && consumer_quit == 1) { | |
2331 | goto end; | |
2332 | } | |
3bd1e081 | 2333 | /* poll on the array of fds */ |
88f2b785 | 2334 | restart: |
3bd1e081 | 2335 | DBG("polling on %d fd", nb_fd + 1); |
cb365c03 | 2336 | num_rdy = poll(pollfd, nb_fd + 1, -1); |
3bd1e081 MD |
2337 | DBG("poll num_rdy : %d", num_rdy); |
2338 | if (num_rdy == -1) { | |
88f2b785 MD |
2339 | /* |
2340 | * Restart interrupted system call. | |
2341 | */ | |
2342 | if (errno == EINTR) { | |
2343 | goto restart; | |
2344 | } | |
7a57cf92 | 2345 | PERROR("Poll error"); |
f73fabfd | 2346 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
2347 | goto end; |
2348 | } else if (num_rdy == 0) { | |
2349 | DBG("Polling thread timed out"); | |
2350 | goto end; | |
2351 | } | |
2352 | ||
3bd1e081 | 2353 | /* |
50f8ae69 | 2354 | * If the consumer_data_pipe triggered poll go directly to the |
00e2e675 DG |
2355 | * beginning of the loop to update the array. We want to prioritize |
2356 | * array update over low-priority reads. | |
3bd1e081 | 2357 | */ |
509bb1cf | 2358 | if (pollfd[nb_fd].revents & (POLLIN | POLLPRI)) { |
04fdd819 | 2359 | size_t pipe_readlen; |
04fdd819 | 2360 | |
50f8ae69 | 2361 | DBG("consumer_data_pipe wake up"); |
04fdd819 MD |
2362 | /* Consume 1 byte of pipe data */ |
2363 | do { | |
50f8ae69 | 2364 | pipe_readlen = read(ctx->consumer_data_pipe[0], &new_stream, |
c869f647 | 2365 | sizeof(new_stream)); |
04fdd819 | 2366 | } while (pipe_readlen == -1 && errno == EINTR); |
23f5f35d DG |
2367 | if (pipe_readlen < 0) { |
2368 | PERROR("read consumer data pipe"); | |
2369 | /* Continue so we can at least handle the current stream(s). */ | |
2370 | continue; | |
2371 | } | |
c869f647 DG |
2372 | |
2373 | /* | |
2374 | * If the stream is NULL, just ignore it. It's also possible that | |
2375 | * the sessiond poll thread changed the consumer_quit state and is | |
2376 | * waking us up to test it. | |
2377 | */ | |
2378 | if (new_stream == NULL) { | |
8994307f | 2379 | validate_endpoint_status_data_stream(); |
c869f647 DG |
2380 | continue; |
2381 | } | |
2382 | ||
43c34bc3 | 2383 | ret = consumer_add_stream(new_stream, data_ht); |
c869f647 DG |
2384 | if (ret) { |
2385 | ERR("Consumer add stream %d failed. Continuing", | |
2386 | new_stream->key); | |
2387 | /* | |
2388 | * At this point, if the add_stream fails, it is not in the | |
2389 | * hash table thus passing the NULL value here. | |
2390 | */ | |
2391 | consumer_del_stream(new_stream, NULL); | |
2392 | } | |
2393 | ||
2394 | /* Continue to update the local streams and handle prio ones */ | |
3bd1e081 MD |
2395 | continue; |
2396 | } | |
2397 | ||
2398 | /* Take care of high priority channels first. */ | |
2399 | for (i = 0; i < nb_fd; i++) { | |
9617607b DG |
2400 | if (local_stream[i] == NULL) { |
2401 | continue; | |
2402 | } | |
fb3a43a9 | 2403 | if (pollfd[i].revents & POLLPRI) { |
d41f73b7 MD |
2404 | DBG("Urgent read on fd %d", pollfd[i].fd); |
2405 | high_prio = 1; | |
4078b776 | 2406 | len = ctx->on_buffer_ready(local_stream[i], ctx); |
d41f73b7 | 2407 | /* it's ok to have an unavailable sub-buffer */ |
b64403e3 | 2408 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2409 | /* Clean the stream and free it. */ |
2410 | consumer_del_stream(local_stream[i], data_ht); | |
9617607b | 2411 | local_stream[i] = NULL; |
4078b776 MD |
2412 | } else if (len > 0) { |
2413 | local_stream[i]->data_read = 1; | |
d41f73b7 | 2414 | } |
3bd1e081 MD |
2415 | } |
2416 | } | |
2417 | ||
4078b776 MD |
2418 | /* |
2419 | * If we read high prio channel in this loop, try again | |
2420 | * for more high prio data. | |
2421 | */ | |
2422 | if (high_prio) { | |
3bd1e081 MD |
2423 | continue; |
2424 | } | |
2425 | ||
2426 | /* Take care of low priority channels. */ | |
4078b776 | 2427 | for (i = 0; i < nb_fd; i++) { |
9617607b DG |
2428 | if (local_stream[i] == NULL) { |
2429 | continue; | |
2430 | } | |
4078b776 MD |
2431 | if ((pollfd[i].revents & POLLIN) || |
2432 | local_stream[i]->hangup_flush_done) { | |
4078b776 MD |
2433 | DBG("Normal read on fd %d", pollfd[i].fd); |
2434 | len = ctx->on_buffer_ready(local_stream[i], ctx); | |
2435 | /* it's ok to have an unavailable sub-buffer */ | |
b64403e3 | 2436 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2437 | /* Clean the stream and free it. */ |
2438 | consumer_del_stream(local_stream[i], data_ht); | |
9617607b | 2439 | local_stream[i] = NULL; |
4078b776 MD |
2440 | } else if (len > 0) { |
2441 | local_stream[i]->data_read = 1; | |
2442 | } | |
2443 | } | |
2444 | } | |
2445 | ||
2446 | /* Handle hangup and errors */ | |
2447 | for (i = 0; i < nb_fd; i++) { | |
9617607b DG |
2448 | if (local_stream[i] == NULL) { |
2449 | continue; | |
2450 | } | |
4078b776 MD |
2451 | if (!local_stream[i]->hangup_flush_done |
2452 | && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL)) | |
2453 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
2454 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
2455 | DBG("fd %d is hup|err|nval. Attempting flush and read.", | |
9617607b | 2456 | pollfd[i].fd); |
4078b776 MD |
2457 | lttng_ustconsumer_on_stream_hangup(local_stream[i]); |
2458 | /* Attempt read again, for the data we just flushed. */ | |
2459 | local_stream[i]->data_read = 1; | |
2460 | } | |
2461 | /* | |
2462 | * If the poll flag is HUP/ERR/NVAL and we have | |
2463 | * read no data in this pass, we can remove the | |
2464 | * stream from its hash table. | |
2465 | */ | |
2466 | if ((pollfd[i].revents & POLLHUP)) { | |
2467 | DBG("Polling fd %d tells it has hung up.", pollfd[i].fd); | |
2468 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2469 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2470 | local_stream[i] = NULL; |
4078b776 MD |
2471 | num_hup++; |
2472 | } | |
2473 | } else if (pollfd[i].revents & POLLERR) { | |
2474 | ERR("Error returned in polling fd %d.", pollfd[i].fd); | |
2475 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2476 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2477 | local_stream[i] = NULL; |
4078b776 MD |
2478 | num_hup++; |
2479 | } | |
2480 | } else if (pollfd[i].revents & POLLNVAL) { | |
2481 | ERR("Polling fd %d tells fd is not open.", pollfd[i].fd); | |
2482 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2483 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2484 | local_stream[i] = NULL; |
4078b776 | 2485 | num_hup++; |
3bd1e081 MD |
2486 | } |
2487 | } | |
9617607b DG |
2488 | if (local_stream[i] != NULL) { |
2489 | local_stream[i]->data_read = 0; | |
2490 | } | |
3bd1e081 MD |
2491 | } |
2492 | } | |
2493 | end: | |
2494 | DBG("polling thread exiting"); | |
2495 | if (pollfd != NULL) { | |
2496 | free(pollfd); | |
2497 | pollfd = NULL; | |
2498 | } | |
2499 | if (local_stream != NULL) { | |
2500 | free(local_stream); | |
2501 | local_stream = NULL; | |
2502 | } | |
fb3a43a9 DG |
2503 | |
2504 | /* | |
2505 | * Close the write side of the pipe so epoll_wait() in | |
7d980def DG |
2506 | * consumer_thread_metadata_poll can catch it. The thread is monitoring the |
2507 | * read side of the pipe. If we close them both, epoll_wait strangely does | |
2508 | * not return and could create a endless wait period if the pipe is the | |
2509 | * only tracked fd in the poll set. The thread will take care of closing | |
2510 | * the read side. | |
fb3a43a9 | 2511 | */ |
f66c074c DG |
2512 | ret = close(ctx->consumer_metadata_pipe[1]); |
2513 | if (ret < 0) { | |
2514 | PERROR("close data pipe"); | |
2515 | } | |
fb3a43a9 | 2516 | |
04bb2b64 | 2517 | destroy_data_stream_ht(data_ht); |
43c34bc3 | 2518 | |
e7b994a3 | 2519 | rcu_unregister_thread(); |
3bd1e081 MD |
2520 | return NULL; |
2521 | } | |
2522 | ||
2523 | /* | |
2524 | * This thread listens on the consumerd socket and receives the file | |
2525 | * descriptors from the session daemon. | |
2526 | */ | |
7d980def | 2527 | void *consumer_thread_sessiond_poll(void *data) |
3bd1e081 | 2528 | { |
d96f09c6 | 2529 | int sock = -1, client_socket, ret; |
3bd1e081 MD |
2530 | /* |
2531 | * structure to poll for incoming data on communication socket avoids | |
2532 | * making blocking sockets. | |
2533 | */ | |
2534 | struct pollfd consumer_sockpoll[2]; | |
2535 | struct lttng_consumer_local_data *ctx = data; | |
2536 | ||
e7b994a3 DG |
2537 | rcu_register_thread(); |
2538 | ||
3bd1e081 MD |
2539 | DBG("Creating command socket %s", ctx->consumer_command_sock_path); |
2540 | unlink(ctx->consumer_command_sock_path); | |
2541 | client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path); | |
2542 | if (client_socket < 0) { | |
2543 | ERR("Cannot create command socket"); | |
2544 | goto end; | |
2545 | } | |
2546 | ||
2547 | ret = lttcomm_listen_unix_sock(client_socket); | |
2548 | if (ret < 0) { | |
2549 | goto end; | |
2550 | } | |
2551 | ||
32258573 | 2552 | DBG("Sending ready command to lttng-sessiond"); |
f73fabfd | 2553 | ret = lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_COMMAND_SOCK_READY); |
3bd1e081 MD |
2554 | /* return < 0 on error, but == 0 is not fatal */ |
2555 | if (ret < 0) { | |
32258573 | 2556 | ERR("Error sending ready command to lttng-sessiond"); |
3bd1e081 MD |
2557 | goto end; |
2558 | } | |
2559 | ||
2560 | ret = fcntl(client_socket, F_SETFL, O_NONBLOCK); | |
2561 | if (ret < 0) { | |
7a57cf92 | 2562 | PERROR("fcntl O_NONBLOCK"); |
3bd1e081 MD |
2563 | goto end; |
2564 | } | |
2565 | ||
2566 | /* prepare the FDs to poll : to client socket and the should_quit pipe */ | |
2567 | consumer_sockpoll[0].fd = ctx->consumer_should_quit[0]; | |
2568 | consumer_sockpoll[0].events = POLLIN | POLLPRI; | |
2569 | consumer_sockpoll[1].fd = client_socket; | |
2570 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
2571 | ||
2572 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2573 | goto end; | |
2574 | } | |
2575 | DBG("Connection on client_socket"); | |
2576 | ||
2577 | /* Blocking call, waiting for transmission */ | |
2578 | sock = lttcomm_accept_unix_sock(client_socket); | |
2579 | if (sock <= 0) { | |
2580 | WARN("On accept"); | |
2581 | goto end; | |
2582 | } | |
2583 | ret = fcntl(sock, F_SETFL, O_NONBLOCK); | |
2584 | if (ret < 0) { | |
7a57cf92 | 2585 | PERROR("fcntl O_NONBLOCK"); |
3bd1e081 MD |
2586 | goto end; |
2587 | } | |
2588 | ||
d96f09c6 DG |
2589 | /* This socket is not useful anymore. */ |
2590 | ret = close(client_socket); | |
2591 | if (ret < 0) { | |
2592 | PERROR("close client_socket"); | |
2593 | } | |
2594 | client_socket = -1; | |
2595 | ||
3bd1e081 MD |
2596 | /* update the polling structure to poll on the established socket */ |
2597 | consumer_sockpoll[1].fd = sock; | |
2598 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
2599 | ||
2600 | while (1) { | |
2601 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2602 | goto end; | |
2603 | } | |
2604 | DBG("Incoming command on sock"); | |
2605 | ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
2606 | if (ret == -ENOENT) { | |
2607 | DBG("Received STOP command"); | |
2608 | goto end; | |
2609 | } | |
4cbc1a04 DG |
2610 | if (ret <= 0) { |
2611 | /* | |
2612 | * This could simply be a session daemon quitting. Don't output | |
2613 | * ERR() here. | |
2614 | */ | |
2615 | DBG("Communication interrupted on command socket"); | |
3bd1e081 MD |
2616 | goto end; |
2617 | } | |
2618 | if (consumer_quit) { | |
2619 | DBG("consumer_thread_receive_fds received quit from signal"); | |
2620 | goto end; | |
2621 | } | |
2622 | DBG("received fds on sock"); | |
2623 | } | |
2624 | end: | |
2625 | DBG("consumer_thread_receive_fds exiting"); | |
2626 | ||
2627 | /* | |
2628 | * when all fds have hung up, the polling thread | |
2629 | * can exit cleanly | |
2630 | */ | |
2631 | consumer_quit = 1; | |
2632 | ||
04fdd819 | 2633 | /* |
c869f647 | 2634 | * Notify the data poll thread to poll back again and test the |
8994307f | 2635 | * consumer_quit state that we just set so to quit gracefully. |
04fdd819 | 2636 | */ |
8994307f | 2637 | notify_thread_pipe(ctx->consumer_data_pipe[1]); |
c869f647 | 2638 | |
d96f09c6 DG |
2639 | /* Cleaning up possibly open sockets. */ |
2640 | if (sock >= 0) { | |
2641 | ret = close(sock); | |
2642 | if (ret < 0) { | |
2643 | PERROR("close sock sessiond poll"); | |
2644 | } | |
2645 | } | |
2646 | if (client_socket >= 0) { | |
2647 | ret = close(sock); | |
2648 | if (ret < 0) { | |
2649 | PERROR("close client_socket sessiond poll"); | |
2650 | } | |
2651 | } | |
2652 | ||
e7b994a3 | 2653 | rcu_unregister_thread(); |
3bd1e081 MD |
2654 | return NULL; |
2655 | } | |
d41f73b7 | 2656 | |
4078b776 | 2657 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
2658 | struct lttng_consumer_local_data *ctx) |
2659 | { | |
74251bb8 DG |
2660 | ssize_t ret; |
2661 | ||
2662 | pthread_mutex_lock(&stream->lock); | |
2663 | ||
d41f73b7 MD |
2664 | switch (consumer_data.type) { |
2665 | case LTTNG_CONSUMER_KERNEL: | |
74251bb8 DG |
2666 | ret = lttng_kconsumer_read_subbuffer(stream, ctx); |
2667 | break; | |
7753dea8 MD |
2668 | case LTTNG_CONSUMER32_UST: |
2669 | case LTTNG_CONSUMER64_UST: | |
74251bb8 DG |
2670 | ret = lttng_ustconsumer_read_subbuffer(stream, ctx); |
2671 | break; | |
d41f73b7 MD |
2672 | default: |
2673 | ERR("Unknown consumer_data type"); | |
2674 | assert(0); | |
74251bb8 DG |
2675 | ret = -ENOSYS; |
2676 | break; | |
d41f73b7 | 2677 | } |
74251bb8 DG |
2678 | |
2679 | pthread_mutex_unlock(&stream->lock); | |
2680 | return ret; | |
d41f73b7 MD |
2681 | } |
2682 | ||
2683 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
2684 | { | |
2685 | switch (consumer_data.type) { | |
2686 | case LTTNG_CONSUMER_KERNEL: | |
2687 | return lttng_kconsumer_on_recv_stream(stream); | |
7753dea8 MD |
2688 | case LTTNG_CONSUMER32_UST: |
2689 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
2690 | return lttng_ustconsumer_on_recv_stream(stream); |
2691 | default: | |
2692 | ERR("Unknown consumer_data type"); | |
2693 | assert(0); | |
2694 | return -ENOSYS; | |
2695 | } | |
2696 | } | |
e4421fec DG |
2697 | |
2698 | /* | |
2699 | * Allocate and set consumer data hash tables. | |
2700 | */ | |
2701 | void lttng_consumer_init(void) | |
2702 | { | |
e4421fec | 2703 | consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
00e2e675 | 2704 | consumer_data.relayd_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
53632229 | 2705 | consumer_data.stream_list_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
46e6455f | 2706 | relayd_session_id_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
e4421fec | 2707 | } |
7735ef9e DG |
2708 | |
2709 | /* | |
2710 | * Process the ADD_RELAYD command receive by a consumer. | |
2711 | * | |
2712 | * This will create a relayd socket pair and add it to the relayd hash table. | |
2713 | * The caller MUST acquire a RCU read side lock before calling it. | |
2714 | */ | |
2715 | int consumer_add_relayd_socket(int net_seq_idx, int sock_type, | |
2716 | struct lttng_consumer_local_data *ctx, int sock, | |
46e6455f DG |
2717 | struct pollfd *consumer_sockpoll, struct lttcomm_sock *relayd_sock, |
2718 | unsigned int sessiond_id) | |
7735ef9e | 2719 | { |
cd2b09ed | 2720 | int fd = -1, ret = -1, relayd_created = 0; |
f50f23d9 | 2721 | enum lttng_error_code ret_code = LTTNG_OK; |
7735ef9e | 2722 | struct consumer_relayd_sock_pair *relayd; |
46e6455f | 2723 | struct consumer_relayd_session_id *relayd_id_node; |
7735ef9e DG |
2724 | |
2725 | DBG("Consumer adding relayd socket (idx: %d)", net_seq_idx); | |
2726 | ||
f50f23d9 DG |
2727 | /* First send a status message before receiving the fds. */ |
2728 | ret = consumer_send_status_msg(sock, ret_code); | |
2729 | if (ret < 0) { | |
2730 | /* Somehow, the session daemon is not responding anymore. */ | |
2731 | goto error; | |
2732 | } | |
2733 | ||
7735ef9e DG |
2734 | /* Get relayd reference if exists. */ |
2735 | relayd = consumer_find_relayd(net_seq_idx); | |
2736 | if (relayd == NULL) { | |
2737 | /* Not found. Allocate one. */ | |
2738 | relayd = consumer_allocate_relayd_sock_pair(net_seq_idx); | |
2739 | if (relayd == NULL) { | |
f73fabfd | 2740 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
7735ef9e DG |
2741 | goto error; |
2742 | } | |
f7079f67 | 2743 | relayd->sessiond_session_id = (uint64_t) sessiond_id; |
cd2b09ed | 2744 | relayd_created = 1; |
7735ef9e DG |
2745 | } |
2746 | ||
2747 | /* Poll on consumer socket. */ | |
2748 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2749 | ret = -EINTR; | |
2750 | goto error; | |
2751 | } | |
2752 | ||
2753 | /* Get relayd socket from session daemon */ | |
2754 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); | |
2755 | if (ret != sizeof(fd)) { | |
f73fabfd | 2756 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
7735ef9e | 2757 | ret = -1; |
4028eeb9 | 2758 | fd = -1; /* Just in case it gets set with an invalid value. */ |
7735ef9e DG |
2759 | goto error; |
2760 | } | |
2761 | ||
f50f23d9 DG |
2762 | /* We have the fds without error. Send status back. */ |
2763 | ret = consumer_send_status_msg(sock, ret_code); | |
2764 | if (ret < 0) { | |
2765 | /* Somehow, the session daemon is not responding anymore. */ | |
2766 | goto error; | |
2767 | } | |
2768 | ||
7735ef9e DG |
2769 | /* Copy socket information and received FD */ |
2770 | switch (sock_type) { | |
2771 | case LTTNG_STREAM_CONTROL: | |
2772 | /* Copy received lttcomm socket */ | |
2773 | lttcomm_copy_sock(&relayd->control_sock, relayd_sock); | |
2774 | ret = lttcomm_create_sock(&relayd->control_sock); | |
4028eeb9 DG |
2775 | /* Immediately try to close the created socket if valid. */ |
2776 | if (relayd->control_sock.fd >= 0) { | |
2777 | if (close(relayd->control_sock.fd)) { | |
2778 | PERROR("close relayd control socket"); | |
2779 | } | |
7735ef9e | 2780 | } |
4028eeb9 | 2781 | /* Handle create_sock error. */ |
f66c074c | 2782 | if (ret < 0) { |
4028eeb9 | 2783 | goto error; |
f66c074c | 2784 | } |
7735ef9e DG |
2785 | |
2786 | /* Assign new file descriptor */ | |
2787 | relayd->control_sock.fd = fd; | |
c5b6f4f0 DG |
2788 | |
2789 | /* | |
2790 | * Create a session on the relayd and store the returned id. No need to | |
2791 | * grab the socket lock since the relayd object is not yet visible. | |
2792 | */ | |
2793 | ret = relayd_create_session(&relayd->control_sock, | |
f7079f67 | 2794 | &relayd->relayd_session_id); |
c5b6f4f0 DG |
2795 | if (ret < 0) { |
2796 | goto error; | |
2797 | } | |
2798 | ||
46e6455f DG |
2799 | /* Set up a relayd session id node. */ |
2800 | relayd_id_node = zmalloc(sizeof(struct consumer_relayd_session_id)); | |
2801 | if (!relayd_id_node) { | |
2802 | PERROR("zmalloc relayd id node"); | |
2803 | goto error; | |
2804 | } | |
2805 | ||
f7079f67 | 2806 | relayd_id_node->relayd_id = relayd->relayd_session_id; |
46e6455f DG |
2807 | relayd_id_node->sessiond_id = (uint64_t) sessiond_id; |
2808 | ||
f7079f67 | 2809 | /* Indexed by session id of the sessiond. */ |
46e6455f DG |
2810 | lttng_ht_node_init_ulong(&relayd_id_node->node, |
2811 | relayd_id_node->sessiond_id); | |
2812 | rcu_read_lock(); | |
2813 | lttng_ht_add_unique_ulong(relayd_session_id_ht, &relayd_id_node->node); | |
2814 | rcu_read_unlock(); | |
2815 | ||
7735ef9e DG |
2816 | break; |
2817 | case LTTNG_STREAM_DATA: | |
2818 | /* Copy received lttcomm socket */ | |
2819 | lttcomm_copy_sock(&relayd->data_sock, relayd_sock); | |
2820 | ret = lttcomm_create_sock(&relayd->data_sock); | |
4028eeb9 DG |
2821 | /* Immediately try to close the created socket if valid. */ |
2822 | if (relayd->data_sock.fd >= 0) { | |
2823 | if (close(relayd->data_sock.fd)) { | |
2824 | PERROR("close relayd data socket"); | |
2825 | } | |
7735ef9e | 2826 | } |
4028eeb9 | 2827 | /* Handle create_sock error. */ |
f66c074c | 2828 | if (ret < 0) { |
4028eeb9 | 2829 | goto error; |
f66c074c | 2830 | } |
7735ef9e DG |
2831 | |
2832 | /* Assign new file descriptor */ | |
2833 | relayd->data_sock.fd = fd; | |
2834 | break; | |
2835 | default: | |
2836 | ERR("Unknown relayd socket type (%d)", sock_type); | |
2837 | goto error; | |
2838 | } | |
2839 | ||
2840 | DBG("Consumer %s socket created successfully with net idx %d (fd: %d)", | |
2841 | sock_type == LTTNG_STREAM_CONTROL ? "control" : "data", | |
2842 | relayd->net_seq_idx, fd); | |
2843 | ||
2844 | /* | |
2845 | * Add relayd socket pair to consumer data hashtable. If object already | |
2846 | * exists or on error, the function gracefully returns. | |
2847 | */ | |
d09e1200 | 2848 | add_relayd(relayd); |
7735ef9e DG |
2849 | |
2850 | /* All good! */ | |
4028eeb9 | 2851 | return 0; |
7735ef9e DG |
2852 | |
2853 | error: | |
4028eeb9 DG |
2854 | /* Close received socket if valid. */ |
2855 | if (fd >= 0) { | |
2856 | if (close(fd)) { | |
2857 | PERROR("close received socket"); | |
2858 | } | |
2859 | } | |
cd2b09ed DG |
2860 | |
2861 | if (relayd_created) { | |
2862 | /* We just want to cleanup. Ignore ret value. */ | |
2863 | (void) relayd_close(&relayd->control_sock); | |
2864 | (void) relayd_close(&relayd->data_sock); | |
2865 | free(relayd); | |
2866 | } | |
2867 | ||
7735ef9e DG |
2868 | return ret; |
2869 | } | |
ca22feea | 2870 | |
4e9a4686 DG |
2871 | /* |
2872 | * Try to lock the stream mutex. | |
2873 | * | |
2874 | * On success, 1 is returned else 0 indicating that the mutex is NOT lock. | |
2875 | */ | |
2876 | static int stream_try_lock(struct lttng_consumer_stream *stream) | |
2877 | { | |
2878 | int ret; | |
2879 | ||
2880 | assert(stream); | |
2881 | ||
2882 | /* | |
2883 | * Try to lock the stream mutex. On failure, we know that the stream is | |
2884 | * being used else where hence there is data still being extracted. | |
2885 | */ | |
2886 | ret = pthread_mutex_trylock(&stream->lock); | |
2887 | if (ret) { | |
2888 | /* For both EBUSY and EINVAL error, the mutex is NOT locked. */ | |
2889 | ret = 0; | |
2890 | goto end; | |
2891 | } | |
2892 | ||
2893 | ret = 1; | |
2894 | ||
2895 | end: | |
2896 | return ret; | |
2897 | } | |
2898 | ||
f7079f67 DG |
2899 | /* |
2900 | * Search for a relayd associated to the session id and return the reference. | |
2901 | * | |
2902 | * A rcu read side lock MUST be acquire before calling this function and locked | |
2903 | * until the relayd object is no longer necessary. | |
2904 | */ | |
2905 | static struct consumer_relayd_sock_pair *find_relayd_by_session_id(uint64_t id) | |
2906 | { | |
2907 | struct lttng_ht_iter iter; | |
2908 | struct lttng_ht_node_ulong *node; | |
2909 | struct consumer_relayd_sock_pair *relayd = NULL; | |
2910 | struct consumer_relayd_session_id *session_id_map; | |
2911 | ||
2912 | /* Get the session id map. */ | |
2913 | lttng_ht_lookup(relayd_session_id_ht, (void *)((unsigned long) id), &iter); | |
2914 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2915 | if (node == NULL) { | |
2916 | goto end; | |
2917 | } | |
2918 | ||
2919 | session_id_map = caa_container_of(node, struct consumer_relayd_session_id, | |
2920 | node); | |
2921 | ||
2922 | /* Iterate over all relayd since they are indexed by net_seq_idx. */ | |
2923 | cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd, | |
2924 | node.node) { | |
2925 | if (relayd->relayd_session_id == session_id_map->relayd_id) { | |
2926 | /* Found the relayd. There can be only one per id. */ | |
2927 | break; | |
2928 | } | |
2929 | } | |
2930 | ||
2931 | end: | |
2932 | return relayd; | |
2933 | } | |
2934 | ||
ca22feea DG |
2935 | /* |
2936 | * Check if for a given session id there is still data needed to be extract | |
2937 | * from the buffers. | |
2938 | * | |
6d805429 | 2939 | * Return 1 if data is pending or else 0 meaning ready to be read. |
ca22feea | 2940 | */ |
6d805429 | 2941 | int consumer_data_pending(uint64_t id) |
ca22feea DG |
2942 | { |
2943 | int ret; | |
2944 | struct lttng_ht_iter iter; | |
2945 | struct lttng_ht *ht; | |
2946 | struct lttng_consumer_stream *stream; | |
f7079f67 | 2947 | struct consumer_relayd_sock_pair *relayd = NULL; |
6d805429 | 2948 | int (*data_pending)(struct lttng_consumer_stream *); |
ca22feea | 2949 | |
6d805429 | 2950 | DBG("Consumer data pending command on session id %" PRIu64, id); |
ca22feea | 2951 | |
6f6eda74 | 2952 | rcu_read_lock(); |
ca22feea DG |
2953 | pthread_mutex_lock(&consumer_data.lock); |
2954 | ||
2955 | switch (consumer_data.type) { | |
2956 | case LTTNG_CONSUMER_KERNEL: | |
6d805429 | 2957 | data_pending = lttng_kconsumer_data_pending; |
ca22feea DG |
2958 | break; |
2959 | case LTTNG_CONSUMER32_UST: | |
2960 | case LTTNG_CONSUMER64_UST: | |
6d805429 | 2961 | data_pending = lttng_ustconsumer_data_pending; |
ca22feea DG |
2962 | break; |
2963 | default: | |
2964 | ERR("Unknown consumer data type"); | |
2965 | assert(0); | |
2966 | } | |
2967 | ||
2968 | /* Ease our life a bit */ | |
2969 | ht = consumer_data.stream_list_ht; | |
2970 | ||
f7079f67 DG |
2971 | relayd = find_relayd_by_session_id(id); |
2972 | if (relayd) { | |
2973 | /* Send init command for data pending. */ | |
2974 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
2975 | ret = relayd_begin_data_pending(&relayd->control_sock, | |
2976 | relayd->relayd_session_id); | |
2977 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
2978 | if (ret < 0) { | |
2979 | /* Communication error thus the relayd so no data pending. */ | |
2980 | goto data_not_pending; | |
2981 | } | |
2982 | } | |
2983 | ||
c8f59ee5 | 2984 | cds_lfht_for_each_entry_duplicate(ht->ht, |
b6314938 | 2985 | ht->hash_fct((void *)((unsigned long) id), lttng_ht_seed), |
ca22feea DG |
2986 | ht->match_fct, (void *)((unsigned long) id), |
2987 | &iter.iter, stream, node_session_id.node) { | |
4e9a4686 DG |
2988 | /* If this call fails, the stream is being used hence data pending. */ |
2989 | ret = stream_try_lock(stream); | |
2990 | if (!ret) { | |
f7079f67 | 2991 | goto data_pending; |
ca22feea | 2992 | } |
ca22feea | 2993 | |
4e9a4686 DG |
2994 | /* |
2995 | * A removed node from the hash table indicates that the stream has | |
2996 | * been deleted thus having a guarantee that the buffers are closed | |
2997 | * on the consumer side. However, data can still be transmitted | |
2998 | * over the network so don't skip the relayd check. | |
2999 | */ | |
3000 | ret = cds_lfht_is_node_deleted(&stream->node.node); | |
3001 | if (!ret) { | |
3002 | /* Check the stream if there is data in the buffers. */ | |
6d805429 DG |
3003 | ret = data_pending(stream); |
3004 | if (ret == 1) { | |
4e9a4686 | 3005 | pthread_mutex_unlock(&stream->lock); |
f7079f67 | 3006 | goto data_pending; |
4e9a4686 DG |
3007 | } |
3008 | } | |
3009 | ||
3010 | /* Relayd check */ | |
f7079f67 | 3011 | if (relayd) { |
c8f59ee5 DG |
3012 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); |
3013 | if (stream->metadata_flag) { | |
ad7051c0 DG |
3014 | ret = relayd_quiescent_control(&relayd->control_sock, |
3015 | stream->relayd_stream_id); | |
c8f59ee5 | 3016 | } else { |
6d805429 | 3017 | ret = relayd_data_pending(&relayd->control_sock, |
c8f59ee5 DG |
3018 | stream->relayd_stream_id, stream->next_net_seq_num); |
3019 | } | |
3020 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
6d805429 | 3021 | if (ret == 1) { |
4e9a4686 | 3022 | pthread_mutex_unlock(&stream->lock); |
f7079f67 | 3023 | goto data_pending; |
c8f59ee5 DG |
3024 | } |
3025 | } | |
4e9a4686 | 3026 | pthread_mutex_unlock(&stream->lock); |
c8f59ee5 | 3027 | } |
ca22feea | 3028 | |
f7079f67 DG |
3029 | if (relayd) { |
3030 | unsigned int is_data_inflight = 0; | |
3031 | ||
3032 | /* Send init command for data pending. */ | |
3033 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
3034 | ret = relayd_end_data_pending(&relayd->control_sock, | |
3035 | relayd->relayd_session_id, &is_data_inflight); | |
3036 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
bdd88757 | 3037 | if (ret < 0) { |
f7079f67 DG |
3038 | goto data_not_pending; |
3039 | } | |
bdd88757 DG |
3040 | if (is_data_inflight) { |
3041 | goto data_pending; | |
3042 | } | |
f7079f67 DG |
3043 | } |
3044 | ||
ca22feea | 3045 | /* |
f7079f67 DG |
3046 | * Finding _no_ node in the hash table and no inflight data means that the |
3047 | * stream(s) have been removed thus data is guaranteed to be available for | |
3048 | * analysis from the trace files. | |
ca22feea DG |
3049 | */ |
3050 | ||
f7079f67 | 3051 | data_not_pending: |
ca22feea DG |
3052 | /* Data is available to be read by a viewer. */ |
3053 | pthread_mutex_unlock(&consumer_data.lock); | |
c8f59ee5 | 3054 | rcu_read_unlock(); |
6d805429 | 3055 | return 0; |
ca22feea | 3056 | |
f7079f67 | 3057 | data_pending: |
ca22feea DG |
3058 | /* Data is still being extracted from buffers. */ |
3059 | pthread_mutex_unlock(&consumer_data.lock); | |
c8f59ee5 | 3060 | rcu_read_unlock(); |
6d805429 | 3061 | return 1; |
ca22feea | 3062 | } |
f50f23d9 DG |
3063 | |
3064 | /* | |
3065 | * Send a ret code status message to the sessiond daemon. | |
3066 | * | |
3067 | * Return the sendmsg() return value. | |
3068 | */ | |
3069 | int consumer_send_status_msg(int sock, int ret_code) | |
3070 | { | |
3071 | struct lttcomm_consumer_status_msg msg; | |
3072 | ||
3073 | msg.ret_code = ret_code; | |
3074 | ||
3075 | return lttcomm_send_unix_sock(sock, &msg, sizeof(msg)); | |
3076 | } |