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> |
331744e3 | 31 | #include <signal.h> |
3bd1e081 | 32 | |
990570ed | 33 | #include <common/common.h> |
fb3a43a9 DG |
34 | #include <common/utils.h> |
35 | #include <common/compat/poll.h> | |
309167d2 | 36 | #include <common/index/index.h> |
10a8a223 | 37 | #include <common/kernel-ctl/kernel-ctl.h> |
00e2e675 | 38 | #include <common/sessiond-comm/relayd.h> |
10a8a223 DG |
39 | #include <common/sessiond-comm/sessiond-comm.h> |
40 | #include <common/kernel-consumer/kernel-consumer.h> | |
00e2e675 | 41 | #include <common/relayd/relayd.h> |
10a8a223 | 42 | #include <common/ust-consumer/ust-consumer.h> |
d3e2ba59 | 43 | #include <common/consumer-timer.h> |
10a8a223 DG |
44 | |
45 | #include "consumer.h" | |
1d1a276c | 46 | #include "consumer-stream.h" |
3bd1e081 MD |
47 | |
48 | struct lttng_consumer_global_data consumer_data = { | |
3bd1e081 MD |
49 | .stream_count = 0, |
50 | .need_update = 1, | |
51 | .type = LTTNG_CONSUMER_UNKNOWN, | |
52 | }; | |
53 | ||
d8ef542d MD |
54 | enum consumer_channel_action { |
55 | CONSUMER_CHANNEL_ADD, | |
a0cbdd2e | 56 | CONSUMER_CHANNEL_DEL, |
d8ef542d MD |
57 | CONSUMER_CHANNEL_QUIT, |
58 | }; | |
59 | ||
60 | struct consumer_channel_msg { | |
61 | enum consumer_channel_action action; | |
a0cbdd2e MD |
62 | struct lttng_consumer_channel *chan; /* add */ |
63 | uint64_t key; /* del */ | |
d8ef542d MD |
64 | }; |
65 | ||
3bd1e081 MD |
66 | /* |
67 | * Flag to inform the polling thread to quit when all fd hung up. Updated by | |
68 | * the consumer_thread_receive_fds when it notices that all fds has hung up. | |
69 | * Also updated by the signal handler (consumer_should_exit()). Read by the | |
70 | * polling threads. | |
71 | */ | |
a98dae5f | 72 | volatile int consumer_quit; |
3bd1e081 | 73 | |
43c34bc3 | 74 | /* |
43c34bc3 DG |
75 | * Global hash table containing respectively metadata and data streams. The |
76 | * stream element in this ht should only be updated by the metadata poll thread | |
77 | * for the metadata and the data poll thread for the data. | |
78 | */ | |
40dc48e0 DG |
79 | static struct lttng_ht *metadata_ht; |
80 | static struct lttng_ht *data_ht; | |
43c34bc3 | 81 | |
acdb9057 DG |
82 | /* |
83 | * Notify a thread lttng pipe to poll back again. This usually means that some | |
84 | * global state has changed so we just send back the thread in a poll wait | |
85 | * call. | |
86 | */ | |
87 | static void notify_thread_lttng_pipe(struct lttng_pipe *pipe) | |
88 | { | |
89 | struct lttng_consumer_stream *null_stream = NULL; | |
90 | ||
91 | assert(pipe); | |
92 | ||
93 | (void) lttng_pipe_write(pipe, &null_stream, sizeof(null_stream)); | |
94 | } | |
95 | ||
d8ef542d MD |
96 | static void notify_channel_pipe(struct lttng_consumer_local_data *ctx, |
97 | struct lttng_consumer_channel *chan, | |
a0cbdd2e | 98 | uint64_t key, |
d8ef542d MD |
99 | enum consumer_channel_action action) |
100 | { | |
101 | struct consumer_channel_msg msg; | |
102 | int ret; | |
103 | ||
e56251fc DG |
104 | memset(&msg, 0, sizeof(msg)); |
105 | ||
d8ef542d MD |
106 | msg.action = action; |
107 | msg.chan = chan; | |
f21dae48 | 108 | msg.key = key; |
d8ef542d MD |
109 | do { |
110 | ret = write(ctx->consumer_channel_pipe[1], &msg, sizeof(msg)); | |
111 | } while (ret < 0 && errno == EINTR); | |
112 | } | |
113 | ||
a0cbdd2e MD |
114 | void notify_thread_del_channel(struct lttng_consumer_local_data *ctx, |
115 | uint64_t key) | |
116 | { | |
117 | notify_channel_pipe(ctx, NULL, key, CONSUMER_CHANNEL_DEL); | |
118 | } | |
119 | ||
d8ef542d MD |
120 | static int read_channel_pipe(struct lttng_consumer_local_data *ctx, |
121 | struct lttng_consumer_channel **chan, | |
a0cbdd2e | 122 | uint64_t *key, |
d8ef542d MD |
123 | enum consumer_channel_action *action) |
124 | { | |
125 | struct consumer_channel_msg msg; | |
126 | int ret; | |
127 | ||
128 | do { | |
129 | ret = read(ctx->consumer_channel_pipe[0], &msg, sizeof(msg)); | |
130 | } while (ret < 0 && errno == EINTR); | |
131 | if (ret > 0) { | |
132 | *action = msg.action; | |
133 | *chan = msg.chan; | |
a0cbdd2e | 134 | *key = msg.key; |
d8ef542d MD |
135 | } |
136 | return ret; | |
137 | } | |
138 | ||
3bd1e081 MD |
139 | /* |
140 | * Find a stream. The consumer_data.lock must be locked during this | |
141 | * call. | |
142 | */ | |
d88aee68 | 143 | static struct lttng_consumer_stream *find_stream(uint64_t key, |
8389e4f8 | 144 | struct lttng_ht *ht) |
3bd1e081 | 145 | { |
e4421fec | 146 | struct lttng_ht_iter iter; |
d88aee68 | 147 | struct lttng_ht_node_u64 *node; |
e4421fec | 148 | struct lttng_consumer_stream *stream = NULL; |
3bd1e081 | 149 | |
8389e4f8 DG |
150 | assert(ht); |
151 | ||
d88aee68 DG |
152 | /* -1ULL keys are lookup failures */ |
153 | if (key == (uint64_t) -1ULL) { | |
7ad0a0cb | 154 | return NULL; |
7a57cf92 | 155 | } |
e4421fec | 156 | |
6065ceec DG |
157 | rcu_read_lock(); |
158 | ||
d88aee68 DG |
159 | lttng_ht_lookup(ht, &key, &iter); |
160 | node = lttng_ht_iter_get_node_u64(&iter); | |
e4421fec DG |
161 | if (node != NULL) { |
162 | stream = caa_container_of(node, struct lttng_consumer_stream, node); | |
3bd1e081 | 163 | } |
e4421fec | 164 | |
6065ceec DG |
165 | rcu_read_unlock(); |
166 | ||
e4421fec | 167 | return stream; |
3bd1e081 MD |
168 | } |
169 | ||
da009f2c | 170 | static void steal_stream_key(uint64_t key, struct lttng_ht *ht) |
7ad0a0cb MD |
171 | { |
172 | struct lttng_consumer_stream *stream; | |
173 | ||
04253271 | 174 | rcu_read_lock(); |
ffe60014 | 175 | stream = find_stream(key, ht); |
04253271 | 176 | if (stream) { |
da009f2c | 177 | stream->key = (uint64_t) -1ULL; |
04253271 MD |
178 | /* |
179 | * We don't want the lookup to match, but we still need | |
180 | * to iterate on this stream when iterating over the hash table. Just | |
181 | * change the node key. | |
182 | */ | |
da009f2c | 183 | stream->node.key = (uint64_t) -1ULL; |
04253271 MD |
184 | } |
185 | rcu_read_unlock(); | |
7ad0a0cb MD |
186 | } |
187 | ||
d56db448 DG |
188 | /* |
189 | * Return a channel object for the given key. | |
190 | * | |
191 | * RCU read side lock MUST be acquired before calling this function and | |
192 | * protects the channel ptr. | |
193 | */ | |
d88aee68 | 194 | struct lttng_consumer_channel *consumer_find_channel(uint64_t key) |
3bd1e081 | 195 | { |
e4421fec | 196 | struct lttng_ht_iter iter; |
d88aee68 | 197 | struct lttng_ht_node_u64 *node; |
e4421fec | 198 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 | 199 | |
d88aee68 DG |
200 | /* -1ULL keys are lookup failures */ |
201 | if (key == (uint64_t) -1ULL) { | |
7ad0a0cb | 202 | return NULL; |
7a57cf92 | 203 | } |
e4421fec | 204 | |
d88aee68 DG |
205 | lttng_ht_lookup(consumer_data.channel_ht, &key, &iter); |
206 | node = lttng_ht_iter_get_node_u64(&iter); | |
e4421fec DG |
207 | if (node != NULL) { |
208 | channel = caa_container_of(node, struct lttng_consumer_channel, node); | |
3bd1e081 | 209 | } |
e4421fec DG |
210 | |
211 | return channel; | |
3bd1e081 MD |
212 | } |
213 | ||
ffe60014 | 214 | static void free_stream_rcu(struct rcu_head *head) |
7ad0a0cb | 215 | { |
d88aee68 DG |
216 | struct lttng_ht_node_u64 *node = |
217 | caa_container_of(head, struct lttng_ht_node_u64, head); | |
ffe60014 DG |
218 | struct lttng_consumer_stream *stream = |
219 | caa_container_of(node, struct lttng_consumer_stream, node); | |
7ad0a0cb | 220 | |
ffe60014 | 221 | free(stream); |
7ad0a0cb MD |
222 | } |
223 | ||
ffe60014 | 224 | static void free_channel_rcu(struct rcu_head *head) |
702b1ea4 | 225 | { |
d88aee68 DG |
226 | struct lttng_ht_node_u64 *node = |
227 | caa_container_of(head, struct lttng_ht_node_u64, head); | |
ffe60014 DG |
228 | struct lttng_consumer_channel *channel = |
229 | caa_container_of(node, struct lttng_consumer_channel, node); | |
702b1ea4 | 230 | |
ffe60014 | 231 | free(channel); |
702b1ea4 MD |
232 | } |
233 | ||
00e2e675 DG |
234 | /* |
235 | * RCU protected relayd socket pair free. | |
236 | */ | |
ffe60014 | 237 | static void free_relayd_rcu(struct rcu_head *head) |
00e2e675 | 238 | { |
d88aee68 DG |
239 | struct lttng_ht_node_u64 *node = |
240 | caa_container_of(head, struct lttng_ht_node_u64, head); | |
00e2e675 DG |
241 | struct consumer_relayd_sock_pair *relayd = |
242 | caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
243 | ||
8994307f DG |
244 | /* |
245 | * Close all sockets. This is done in the call RCU since we don't want the | |
246 | * socket fds to be reassigned thus potentially creating bad state of the | |
247 | * relayd object. | |
248 | * | |
249 | * We do not have to lock the control socket mutex here since at this stage | |
250 | * there is no one referencing to this relayd object. | |
251 | */ | |
252 | (void) relayd_close(&relayd->control_sock); | |
253 | (void) relayd_close(&relayd->data_sock); | |
254 | ||
00e2e675 DG |
255 | free(relayd); |
256 | } | |
257 | ||
258 | /* | |
259 | * Destroy and free relayd socket pair object. | |
00e2e675 | 260 | */ |
51230d70 | 261 | void consumer_destroy_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
262 | { |
263 | int ret; | |
264 | struct lttng_ht_iter iter; | |
265 | ||
173af62f DG |
266 | if (relayd == NULL) { |
267 | return; | |
268 | } | |
269 | ||
00e2e675 DG |
270 | DBG("Consumer destroy and close relayd socket pair"); |
271 | ||
272 | iter.iter.node = &relayd->node.node; | |
273 | ret = lttng_ht_del(consumer_data.relayd_ht, &iter); | |
173af62f | 274 | if (ret != 0) { |
8994307f | 275 | /* We assume the relayd is being or is destroyed */ |
173af62f DG |
276 | return; |
277 | } | |
00e2e675 | 278 | |
00e2e675 | 279 | /* RCU free() call */ |
ffe60014 DG |
280 | call_rcu(&relayd->node.head, free_relayd_rcu); |
281 | } | |
282 | ||
283 | /* | |
284 | * Remove a channel from the global list protected by a mutex. This function is | |
285 | * also responsible for freeing its data structures. | |
286 | */ | |
287 | void consumer_del_channel(struct lttng_consumer_channel *channel) | |
288 | { | |
289 | int ret; | |
290 | struct lttng_ht_iter iter; | |
f2a444f1 | 291 | struct lttng_consumer_stream *stream, *stmp; |
ffe60014 | 292 | |
d88aee68 | 293 | DBG("Consumer delete channel key %" PRIu64, channel->key); |
ffe60014 DG |
294 | |
295 | pthread_mutex_lock(&consumer_data.lock); | |
a9838785 | 296 | pthread_mutex_lock(&channel->lock); |
ffe60014 | 297 | |
51e762e5 JD |
298 | /* Delete streams that might have been left in the stream list. */ |
299 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
300 | send_node) { | |
301 | cds_list_del(&stream->send_node); | |
302 | /* | |
303 | * Once a stream is added to this list, the buffers were created so | |
304 | * we have a guarantee that this call will succeed. | |
305 | */ | |
306 | consumer_stream_destroy(stream, NULL); | |
307 | } | |
308 | ||
d3e2ba59 JD |
309 | if (channel->live_timer_enabled == 1) { |
310 | consumer_timer_live_stop(channel); | |
311 | } | |
312 | ||
ffe60014 DG |
313 | switch (consumer_data.type) { |
314 | case LTTNG_CONSUMER_KERNEL: | |
315 | break; | |
316 | case LTTNG_CONSUMER32_UST: | |
317 | case LTTNG_CONSUMER64_UST: | |
318 | lttng_ustconsumer_del_channel(channel); | |
319 | break; | |
320 | default: | |
321 | ERR("Unknown consumer_data type"); | |
322 | assert(0); | |
323 | goto end; | |
324 | } | |
325 | ||
326 | rcu_read_lock(); | |
327 | iter.iter.node = &channel->node.node; | |
328 | ret = lttng_ht_del(consumer_data.channel_ht, &iter); | |
329 | assert(!ret); | |
330 | rcu_read_unlock(); | |
331 | ||
332 | call_rcu(&channel->node.head, free_channel_rcu); | |
333 | end: | |
a9838785 | 334 | pthread_mutex_unlock(&channel->lock); |
ffe60014 | 335 | pthread_mutex_unlock(&consumer_data.lock); |
00e2e675 DG |
336 | } |
337 | ||
228b5bf7 DG |
338 | /* |
339 | * Iterate over the relayd hash table and destroy each element. Finally, | |
340 | * destroy the whole hash table. | |
341 | */ | |
342 | static void cleanup_relayd_ht(void) | |
343 | { | |
344 | struct lttng_ht_iter iter; | |
345 | struct consumer_relayd_sock_pair *relayd; | |
346 | ||
347 | rcu_read_lock(); | |
348 | ||
349 | cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd, | |
350 | node.node) { | |
51230d70 | 351 | consumer_destroy_relayd(relayd); |
228b5bf7 DG |
352 | } |
353 | ||
228b5bf7 | 354 | rcu_read_unlock(); |
36b588ed MD |
355 | |
356 | lttng_ht_destroy(consumer_data.relayd_ht); | |
228b5bf7 DG |
357 | } |
358 | ||
8994307f DG |
359 | /* |
360 | * Update the end point status of all streams having the given network sequence | |
361 | * index (relayd index). | |
362 | * | |
363 | * It's atomically set without having the stream mutex locked which is fine | |
364 | * because we handle the write/read race with a pipe wakeup for each thread. | |
365 | */ | |
da009f2c | 366 | static void update_endpoint_status_by_netidx(uint64_t net_seq_idx, |
8994307f DG |
367 | enum consumer_endpoint_status status) |
368 | { | |
369 | struct lttng_ht_iter iter; | |
370 | struct lttng_consumer_stream *stream; | |
371 | ||
da009f2c | 372 | DBG("Consumer set delete flag on stream by idx %" PRIu64, net_seq_idx); |
8994307f DG |
373 | |
374 | rcu_read_lock(); | |
375 | ||
376 | /* Let's begin with metadata */ | |
377 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) { | |
378 | if (stream->net_seq_idx == net_seq_idx) { | |
379 | uatomic_set(&stream->endpoint_status, status); | |
380 | DBG("Delete flag set to metadata stream %d", stream->wait_fd); | |
381 | } | |
382 | } | |
383 | ||
384 | /* Follow up by the data streams */ | |
385 | cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) { | |
386 | if (stream->net_seq_idx == net_seq_idx) { | |
387 | uatomic_set(&stream->endpoint_status, status); | |
388 | DBG("Delete flag set to data stream %d", stream->wait_fd); | |
389 | } | |
390 | } | |
391 | rcu_read_unlock(); | |
392 | } | |
393 | ||
394 | /* | |
395 | * Cleanup a relayd object by flagging every associated streams for deletion, | |
396 | * destroying the object meaning removing it from the relayd hash table, | |
397 | * closing the sockets and freeing the memory in a RCU call. | |
398 | * | |
399 | * If a local data context is available, notify the threads that the streams' | |
400 | * state have changed. | |
401 | */ | |
402 | static void cleanup_relayd(struct consumer_relayd_sock_pair *relayd, | |
403 | struct lttng_consumer_local_data *ctx) | |
404 | { | |
da009f2c | 405 | uint64_t netidx; |
8994307f DG |
406 | |
407 | assert(relayd); | |
408 | ||
9617607b DG |
409 | DBG("Cleaning up relayd sockets"); |
410 | ||
8994307f DG |
411 | /* Save the net sequence index before destroying the object */ |
412 | netidx = relayd->net_seq_idx; | |
413 | ||
414 | /* | |
415 | * Delete the relayd from the relayd hash table, close the sockets and free | |
416 | * the object in a RCU call. | |
417 | */ | |
51230d70 | 418 | consumer_destroy_relayd(relayd); |
8994307f DG |
419 | |
420 | /* Set inactive endpoint to all streams */ | |
421 | update_endpoint_status_by_netidx(netidx, CONSUMER_ENDPOINT_INACTIVE); | |
422 | ||
423 | /* | |
424 | * With a local data context, notify the threads that the streams' state | |
425 | * have changed. The write() action on the pipe acts as an "implicit" | |
426 | * memory barrier ordering the updates of the end point status from the | |
427 | * read of this status which happens AFTER receiving this notify. | |
428 | */ | |
429 | if (ctx) { | |
acdb9057 | 430 | notify_thread_lttng_pipe(ctx->consumer_data_pipe); |
13886d2d | 431 | notify_thread_lttng_pipe(ctx->consumer_metadata_pipe); |
8994307f DG |
432 | } |
433 | } | |
434 | ||
a6ba4fe1 DG |
435 | /* |
436 | * Flag a relayd socket pair for destruction. Destroy it if the refcount | |
437 | * reaches zero. | |
438 | * | |
439 | * RCU read side lock MUST be aquired before calling this function. | |
440 | */ | |
441 | void consumer_flag_relayd_for_destroy(struct consumer_relayd_sock_pair *relayd) | |
442 | { | |
443 | assert(relayd); | |
444 | ||
445 | /* Set destroy flag for this object */ | |
446 | uatomic_set(&relayd->destroy_flag, 1); | |
447 | ||
448 | /* Destroy the relayd if refcount is 0 */ | |
449 | if (uatomic_read(&relayd->refcount) == 0) { | |
51230d70 | 450 | consumer_destroy_relayd(relayd); |
a6ba4fe1 DG |
451 | } |
452 | } | |
453 | ||
3bd1e081 | 454 | /* |
1d1a276c DG |
455 | * Completly destroy stream from every visiable data structure and the given |
456 | * hash table if one. | |
457 | * | |
458 | * One this call returns, the stream object is not longer usable nor visible. | |
3bd1e081 | 459 | */ |
e316aad5 DG |
460 | void consumer_del_stream(struct lttng_consumer_stream *stream, |
461 | struct lttng_ht *ht) | |
3bd1e081 | 462 | { |
1d1a276c | 463 | consumer_stream_destroy(stream, ht); |
3bd1e081 MD |
464 | } |
465 | ||
5ab66908 MD |
466 | /* |
467 | * XXX naming of del vs destroy is all mixed up. | |
468 | */ | |
469 | void consumer_del_stream_for_data(struct lttng_consumer_stream *stream) | |
470 | { | |
471 | consumer_stream_destroy(stream, data_ht); | |
472 | } | |
473 | ||
474 | void consumer_del_stream_for_metadata(struct lttng_consumer_stream *stream) | |
475 | { | |
476 | consumer_stream_destroy(stream, metadata_ht); | |
477 | } | |
478 | ||
d88aee68 DG |
479 | struct lttng_consumer_stream *consumer_allocate_stream(uint64_t channel_key, |
480 | uint64_t stream_key, | |
3bd1e081 | 481 | enum lttng_consumer_stream_state state, |
ffe60014 | 482 | const char *channel_name, |
6df2e2c9 | 483 | uid_t uid, |
00e2e675 | 484 | gid_t gid, |
57a269f2 | 485 | uint64_t relayd_id, |
53632229 | 486 | uint64_t session_id, |
ffe60014 DG |
487 | int cpu, |
488 | int *alloc_ret, | |
4891ece8 DG |
489 | enum consumer_channel_type type, |
490 | unsigned int monitor) | |
3bd1e081 | 491 | { |
ffe60014 | 492 | int ret; |
3bd1e081 | 493 | struct lttng_consumer_stream *stream; |
3bd1e081 | 494 | |
effcf122 | 495 | stream = zmalloc(sizeof(*stream)); |
3bd1e081 | 496 | if (stream == NULL) { |
7a57cf92 | 497 | PERROR("malloc struct lttng_consumer_stream"); |
ffe60014 | 498 | ret = -ENOMEM; |
7a57cf92 | 499 | goto end; |
3bd1e081 | 500 | } |
7a57cf92 | 501 | |
d56db448 DG |
502 | rcu_read_lock(); |
503 | ||
3bd1e081 | 504 | stream->key = stream_key; |
3bd1e081 MD |
505 | stream->out_fd = -1; |
506 | stream->out_fd_offset = 0; | |
e5d1a9b3 | 507 | stream->output_written = 0; |
3bd1e081 | 508 | stream->state = state; |
6df2e2c9 MD |
509 | stream->uid = uid; |
510 | stream->gid = gid; | |
ffe60014 | 511 | stream->net_seq_idx = relayd_id; |
53632229 | 512 | stream->session_id = session_id; |
4891ece8 | 513 | stream->monitor = monitor; |
774d490c | 514 | stream->endpoint_status = CONSUMER_ENDPOINT_ACTIVE; |
309167d2 | 515 | stream->index_fd = -1; |
53632229 | 516 | pthread_mutex_init(&stream->lock, NULL); |
58b1f425 | 517 | |
ffe60014 DG |
518 | /* If channel is the metadata, flag this stream as metadata. */ |
519 | if (type == CONSUMER_CHANNEL_TYPE_METADATA) { | |
520 | stream->metadata_flag = 1; | |
521 | /* Metadata is flat out. */ | |
522 | strncpy(stream->name, DEFAULT_METADATA_NAME, sizeof(stream->name)); | |
58b1f425 | 523 | } else { |
ffe60014 DG |
524 | /* Format stream name to <channel_name>_<cpu_number> */ |
525 | ret = snprintf(stream->name, sizeof(stream->name), "%s_%d", | |
526 | channel_name, cpu); | |
527 | if (ret < 0) { | |
528 | PERROR("snprintf stream name"); | |
529 | goto error; | |
530 | } | |
58b1f425 | 531 | } |
c30aaa51 | 532 | |
ffe60014 | 533 | /* Key is always the wait_fd for streams. */ |
d88aee68 | 534 | lttng_ht_node_init_u64(&stream->node, stream->key); |
ffe60014 | 535 | |
d8ef542d MD |
536 | /* Init node per channel id key */ |
537 | lttng_ht_node_init_u64(&stream->node_channel_id, channel_key); | |
538 | ||
53632229 | 539 | /* Init session id node with the stream session id */ |
d88aee68 | 540 | lttng_ht_node_init_u64(&stream->node_session_id, stream->session_id); |
53632229 | 541 | |
07b86b52 JD |
542 | DBG3("Allocated stream %s (key %" PRIu64 ", chan_key %" PRIu64 |
543 | " relayd_id %" PRIu64 ", session_id %" PRIu64, | |
544 | stream->name, stream->key, channel_key, | |
545 | stream->net_seq_idx, stream->session_id); | |
d56db448 DG |
546 | |
547 | rcu_read_unlock(); | |
3bd1e081 | 548 | return stream; |
c80048c6 MD |
549 | |
550 | error: | |
d56db448 | 551 | rcu_read_unlock(); |
c80048c6 | 552 | free(stream); |
7a57cf92 | 553 | end: |
ffe60014 DG |
554 | if (alloc_ret) { |
555 | *alloc_ret = ret; | |
556 | } | |
c80048c6 | 557 | return NULL; |
3bd1e081 MD |
558 | } |
559 | ||
560 | /* | |
561 | * Add a stream to the global list protected by a mutex. | |
562 | */ | |
5ab66908 | 563 | int consumer_add_data_stream(struct lttng_consumer_stream *stream) |
3bd1e081 | 564 | { |
5ab66908 | 565 | struct lttng_ht *ht = data_ht; |
3bd1e081 MD |
566 | int ret = 0; |
567 | ||
e316aad5 | 568 | assert(stream); |
43c34bc3 | 569 | assert(ht); |
c77fc10a | 570 | |
d88aee68 | 571 | DBG3("Adding consumer stream %" PRIu64, stream->key); |
e316aad5 DG |
572 | |
573 | pthread_mutex_lock(&consumer_data.lock); | |
a9838785 | 574 | pthread_mutex_lock(&stream->chan->lock); |
ec6ea7d0 | 575 | pthread_mutex_lock(&stream->chan->timer_lock); |
2e818a6a | 576 | pthread_mutex_lock(&stream->lock); |
b0b335c8 | 577 | rcu_read_lock(); |
e316aad5 | 578 | |
43c34bc3 | 579 | /* Steal stream identifier to avoid having streams with the same key */ |
ffe60014 | 580 | steal_stream_key(stream->key, ht); |
43c34bc3 | 581 | |
d88aee68 | 582 | lttng_ht_add_unique_u64(ht, &stream->node); |
00e2e675 | 583 | |
d8ef542d MD |
584 | lttng_ht_add_u64(consumer_data.stream_per_chan_id_ht, |
585 | &stream->node_channel_id); | |
586 | ||
ca22feea DG |
587 | /* |
588 | * Add stream to the stream_list_ht of the consumer data. No need to steal | |
589 | * the key since the HT does not use it and we allow to add redundant keys | |
590 | * into this table. | |
591 | */ | |
d88aee68 | 592 | lttng_ht_add_u64(consumer_data.stream_list_ht, &stream->node_session_id); |
ca22feea | 593 | |
e316aad5 | 594 | /* |
ffe60014 DG |
595 | * When nb_init_stream_left reaches 0, we don't need to trigger any action |
596 | * in terms of destroying the associated channel, because the action that | |
e316aad5 DG |
597 | * causes the count to become 0 also causes a stream to be added. The |
598 | * channel deletion will thus be triggered by the following removal of this | |
599 | * stream. | |
600 | */ | |
ffe60014 | 601 | if (uatomic_read(&stream->chan->nb_init_stream_left) > 0) { |
f2ad556d MD |
602 | /* Increment refcount before decrementing nb_init_stream_left */ |
603 | cmm_smp_wmb(); | |
ffe60014 | 604 | uatomic_dec(&stream->chan->nb_init_stream_left); |
e316aad5 DG |
605 | } |
606 | ||
607 | /* Update consumer data once the node is inserted. */ | |
3bd1e081 MD |
608 | consumer_data.stream_count++; |
609 | consumer_data.need_update = 1; | |
610 | ||
e316aad5 | 611 | rcu_read_unlock(); |
2e818a6a | 612 | pthread_mutex_unlock(&stream->lock); |
ec6ea7d0 | 613 | pthread_mutex_unlock(&stream->chan->timer_lock); |
a9838785 | 614 | pthread_mutex_unlock(&stream->chan->lock); |
3bd1e081 | 615 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 616 | |
3bd1e081 MD |
617 | return ret; |
618 | } | |
619 | ||
5ab66908 MD |
620 | void consumer_del_data_stream(struct lttng_consumer_stream *stream) |
621 | { | |
622 | consumer_del_stream(stream, data_ht); | |
623 | } | |
624 | ||
00e2e675 | 625 | /* |
3f8e211f DG |
626 | * Add relayd socket to global consumer data hashtable. RCU read side lock MUST |
627 | * be acquired before calling this. | |
00e2e675 | 628 | */ |
d09e1200 | 629 | static int add_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
630 | { |
631 | int ret = 0; | |
d88aee68 | 632 | struct lttng_ht_node_u64 *node; |
00e2e675 DG |
633 | struct lttng_ht_iter iter; |
634 | ||
ffe60014 | 635 | assert(relayd); |
00e2e675 | 636 | |
00e2e675 | 637 | lttng_ht_lookup(consumer_data.relayd_ht, |
d88aee68 DG |
638 | &relayd->net_seq_idx, &iter); |
639 | node = lttng_ht_iter_get_node_u64(&iter); | |
00e2e675 | 640 | if (node != NULL) { |
00e2e675 DG |
641 | goto end; |
642 | } | |
d88aee68 | 643 | lttng_ht_add_unique_u64(consumer_data.relayd_ht, &relayd->node); |
00e2e675 | 644 | |
00e2e675 DG |
645 | end: |
646 | return ret; | |
647 | } | |
648 | ||
649 | /* | |
650 | * Allocate and return a consumer relayd socket. | |
651 | */ | |
652 | struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair( | |
da009f2c | 653 | uint64_t net_seq_idx) |
00e2e675 DG |
654 | { |
655 | struct consumer_relayd_sock_pair *obj = NULL; | |
656 | ||
da009f2c MD |
657 | /* net sequence index of -1 is a failure */ |
658 | if (net_seq_idx == (uint64_t) -1ULL) { | |
00e2e675 DG |
659 | goto error; |
660 | } | |
661 | ||
662 | obj = zmalloc(sizeof(struct consumer_relayd_sock_pair)); | |
663 | if (obj == NULL) { | |
664 | PERROR("zmalloc relayd sock"); | |
665 | goto error; | |
666 | } | |
667 | ||
668 | obj->net_seq_idx = net_seq_idx; | |
669 | obj->refcount = 0; | |
173af62f | 670 | obj->destroy_flag = 0; |
f96e4545 MD |
671 | obj->control_sock.sock.fd = -1; |
672 | obj->data_sock.sock.fd = -1; | |
d88aee68 | 673 | lttng_ht_node_init_u64(&obj->node, obj->net_seq_idx); |
00e2e675 DG |
674 | pthread_mutex_init(&obj->ctrl_sock_mutex, NULL); |
675 | ||
676 | error: | |
677 | return obj; | |
678 | } | |
679 | ||
680 | /* | |
681 | * Find a relayd socket pair in the global consumer data. | |
682 | * | |
683 | * Return the object if found else NULL. | |
b0b335c8 MD |
684 | * RCU read-side lock must be held across this call and while using the |
685 | * returned object. | |
00e2e675 | 686 | */ |
d88aee68 | 687 | struct consumer_relayd_sock_pair *consumer_find_relayd(uint64_t key) |
00e2e675 DG |
688 | { |
689 | struct lttng_ht_iter iter; | |
d88aee68 | 690 | struct lttng_ht_node_u64 *node; |
00e2e675 DG |
691 | struct consumer_relayd_sock_pair *relayd = NULL; |
692 | ||
693 | /* Negative keys are lookup failures */ | |
d88aee68 | 694 | if (key == (uint64_t) -1ULL) { |
00e2e675 DG |
695 | goto error; |
696 | } | |
697 | ||
d88aee68 | 698 | lttng_ht_lookup(consumer_data.relayd_ht, &key, |
00e2e675 | 699 | &iter); |
d88aee68 | 700 | node = lttng_ht_iter_get_node_u64(&iter); |
00e2e675 DG |
701 | if (node != NULL) { |
702 | relayd = caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
703 | } | |
704 | ||
00e2e675 DG |
705 | error: |
706 | return relayd; | |
707 | } | |
708 | ||
10a50311 JD |
709 | /* |
710 | * Find a relayd and send the stream | |
711 | * | |
712 | * Returns 0 on success, < 0 on error | |
713 | */ | |
714 | int consumer_send_relayd_stream(struct lttng_consumer_stream *stream, | |
715 | char *path) | |
716 | { | |
717 | int ret = 0; | |
718 | struct consumer_relayd_sock_pair *relayd; | |
719 | ||
720 | assert(stream); | |
721 | assert(stream->net_seq_idx != -1ULL); | |
722 | assert(path); | |
723 | ||
724 | /* The stream is not metadata. Get relayd reference if exists. */ | |
725 | rcu_read_lock(); | |
726 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
727 | if (relayd != NULL) { | |
728 | /* Add stream on the relayd */ | |
729 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
730 | ret = relayd_add_stream(&relayd->control_sock, stream->name, | |
731 | path, &stream->relayd_stream_id, | |
732 | stream->chan->tracefile_size, stream->chan->tracefile_count); | |
733 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
734 | if (ret < 0) { | |
735 | goto end; | |
736 | } | |
1c20f0e2 | 737 | |
10a50311 | 738 | uatomic_inc(&relayd->refcount); |
d01178b6 | 739 | stream->sent_to_relayd = 1; |
10a50311 JD |
740 | } else { |
741 | ERR("Stream %" PRIu64 " relayd ID %" PRIu64 " unknown. Can't send it.", | |
742 | stream->key, stream->net_seq_idx); | |
743 | ret = -1; | |
744 | goto end; | |
745 | } | |
746 | ||
747 | DBG("Stream %s with key %" PRIu64 " sent to relayd id %" PRIu64, | |
748 | stream->name, stream->key, stream->net_seq_idx); | |
749 | ||
750 | end: | |
751 | rcu_read_unlock(); | |
752 | return ret; | |
753 | } | |
754 | ||
755 | /* | |
756 | * Find a relayd and close the stream | |
757 | */ | |
758 | void close_relayd_stream(struct lttng_consumer_stream *stream) | |
759 | { | |
760 | struct consumer_relayd_sock_pair *relayd; | |
761 | ||
762 | /* The stream is not metadata. Get relayd reference if exists. */ | |
763 | rcu_read_lock(); | |
764 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
765 | if (relayd) { | |
766 | consumer_stream_relayd_close(stream, relayd); | |
767 | } | |
768 | rcu_read_unlock(); | |
769 | } | |
770 | ||
00e2e675 DG |
771 | /* |
772 | * Handle stream for relayd transmission if the stream applies for network | |
773 | * streaming where the net sequence index is set. | |
774 | * | |
775 | * Return destination file descriptor or negative value on error. | |
776 | */ | |
6197aea7 | 777 | static int write_relayd_stream_header(struct lttng_consumer_stream *stream, |
1d4dfdef DG |
778 | size_t data_size, unsigned long padding, |
779 | struct consumer_relayd_sock_pair *relayd) | |
00e2e675 DG |
780 | { |
781 | int outfd = -1, ret; | |
00e2e675 DG |
782 | struct lttcomm_relayd_data_hdr data_hdr; |
783 | ||
784 | /* Safety net */ | |
785 | assert(stream); | |
6197aea7 | 786 | assert(relayd); |
00e2e675 DG |
787 | |
788 | /* Reset data header */ | |
789 | memset(&data_hdr, 0, sizeof(data_hdr)); | |
790 | ||
00e2e675 DG |
791 | if (stream->metadata_flag) { |
792 | /* Caller MUST acquire the relayd control socket lock */ | |
793 | ret = relayd_send_metadata(&relayd->control_sock, data_size); | |
794 | if (ret < 0) { | |
795 | goto error; | |
796 | } | |
797 | ||
798 | /* Metadata are always sent on the control socket. */ | |
6151a90f | 799 | outfd = relayd->control_sock.sock.fd; |
00e2e675 DG |
800 | } else { |
801 | /* Set header with stream information */ | |
802 | data_hdr.stream_id = htobe64(stream->relayd_stream_id); | |
803 | data_hdr.data_size = htobe32(data_size); | |
1d4dfdef | 804 | data_hdr.padding_size = htobe32(padding); |
39df6d9f DG |
805 | /* |
806 | * Note that net_seq_num below is assigned with the *current* value of | |
807 | * next_net_seq_num and only after that the next_net_seq_num will be | |
808 | * increment. This is why when issuing a command on the relayd using | |
809 | * this next value, 1 should always be substracted in order to compare | |
810 | * the last seen sequence number on the relayd side to the last sent. | |
811 | */ | |
3604f373 | 812 | data_hdr.net_seq_num = htobe64(stream->next_net_seq_num); |
00e2e675 DG |
813 | /* Other fields are zeroed previously */ |
814 | ||
815 | ret = relayd_send_data_hdr(&relayd->data_sock, &data_hdr, | |
816 | sizeof(data_hdr)); | |
817 | if (ret < 0) { | |
818 | goto error; | |
819 | } | |
820 | ||
3604f373 DG |
821 | ++stream->next_net_seq_num; |
822 | ||
00e2e675 | 823 | /* Set to go on data socket */ |
6151a90f | 824 | outfd = relayd->data_sock.sock.fd; |
00e2e675 DG |
825 | } |
826 | ||
827 | error: | |
828 | return outfd; | |
829 | } | |
830 | ||
3bd1e081 | 831 | /* |
ffe60014 DG |
832 | * Allocate and return a new lttng_consumer_channel object using the given key |
833 | * to initialize the hash table node. | |
834 | * | |
835 | * On error, return NULL. | |
3bd1e081 | 836 | */ |
886224ff | 837 | struct lttng_consumer_channel *consumer_allocate_channel(uint64_t key, |
ffe60014 DG |
838 | uint64_t session_id, |
839 | const char *pathname, | |
840 | const char *name, | |
841 | uid_t uid, | |
842 | gid_t gid, | |
57a269f2 | 843 | uint64_t relayd_id, |
1624d5b7 JD |
844 | enum lttng_event_output output, |
845 | uint64_t tracefile_size, | |
2bba9e53 | 846 | uint64_t tracefile_count, |
1950109e | 847 | uint64_t session_id_per_pid, |
ecc48a90 JD |
848 | unsigned int monitor, |
849 | unsigned int live_timer_interval) | |
3bd1e081 MD |
850 | { |
851 | struct lttng_consumer_channel *channel; | |
3bd1e081 | 852 | |
276b26d1 | 853 | channel = zmalloc(sizeof(*channel)); |
3bd1e081 | 854 | if (channel == NULL) { |
7a57cf92 | 855 | PERROR("malloc struct lttng_consumer_channel"); |
3bd1e081 MD |
856 | goto end; |
857 | } | |
ffe60014 DG |
858 | |
859 | channel->key = key; | |
3bd1e081 | 860 | channel->refcount = 0; |
ffe60014 | 861 | channel->session_id = session_id; |
1950109e | 862 | channel->session_id_per_pid = session_id_per_pid; |
ffe60014 DG |
863 | channel->uid = uid; |
864 | channel->gid = gid; | |
865 | channel->relayd_id = relayd_id; | |
866 | channel->output = output; | |
1624d5b7 JD |
867 | channel->tracefile_size = tracefile_size; |
868 | channel->tracefile_count = tracefile_count; | |
2bba9e53 | 869 | channel->monitor = monitor; |
ecc48a90 | 870 | channel->live_timer_interval = live_timer_interval; |
a9838785 | 871 | pthread_mutex_init(&channel->lock, NULL); |
ec6ea7d0 | 872 | pthread_mutex_init(&channel->timer_lock, NULL); |
ffe60014 | 873 | |
07b86b52 JD |
874 | /* |
875 | * In monitor mode, the streams associated with the channel will be put in | |
876 | * a special list ONLY owned by this channel. So, the refcount is set to 1 | |
877 | * here meaning that the channel itself has streams that are referenced. | |
878 | * | |
879 | * On a channel deletion, once the channel is no longer visible, the | |
880 | * refcount is decremented and checked for a zero value to delete it. With | |
881 | * streams in no monitor mode, it will now be safe to destroy the channel. | |
882 | */ | |
883 | if (!channel->monitor) { | |
884 | channel->refcount = 1; | |
885 | } | |
886 | ||
ffe60014 DG |
887 | strncpy(channel->pathname, pathname, sizeof(channel->pathname)); |
888 | channel->pathname[sizeof(channel->pathname) - 1] = '\0'; | |
889 | ||
890 | strncpy(channel->name, name, sizeof(channel->name)); | |
891 | channel->name[sizeof(channel->name) - 1] = '\0'; | |
892 | ||
d88aee68 | 893 | lttng_ht_node_init_u64(&channel->node, channel->key); |
d8ef542d MD |
894 | |
895 | channel->wait_fd = -1; | |
896 | ||
ffe60014 DG |
897 | CDS_INIT_LIST_HEAD(&channel->streams.head); |
898 | ||
d88aee68 | 899 | DBG("Allocated channel (key %" PRIu64 ")", channel->key) |
3bd1e081 | 900 | |
3bd1e081 MD |
901 | end: |
902 | return channel; | |
903 | } | |
904 | ||
905 | /* | |
906 | * Add a channel to the global list protected by a mutex. | |
821fffb2 DG |
907 | * |
908 | * On success 0 is returned else a negative value. | |
3bd1e081 | 909 | */ |
d8ef542d MD |
910 | int consumer_add_channel(struct lttng_consumer_channel *channel, |
911 | struct lttng_consumer_local_data *ctx) | |
3bd1e081 | 912 | { |
ffe60014 | 913 | int ret = 0; |
d88aee68 | 914 | struct lttng_ht_node_u64 *node; |
c77fc10a DG |
915 | struct lttng_ht_iter iter; |
916 | ||
3bd1e081 | 917 | pthread_mutex_lock(&consumer_data.lock); |
a9838785 | 918 | pthread_mutex_lock(&channel->lock); |
ec6ea7d0 | 919 | pthread_mutex_lock(&channel->timer_lock); |
6065ceec | 920 | rcu_read_lock(); |
c77fc10a | 921 | |
7972aab2 | 922 | lttng_ht_lookup(consumer_data.channel_ht, &channel->key, &iter); |
d88aee68 | 923 | node = lttng_ht_iter_get_node_u64(&iter); |
c77fc10a DG |
924 | if (node != NULL) { |
925 | /* Channel already exist. Ignore the insertion */ | |
d88aee68 DG |
926 | ERR("Consumer add channel key %" PRIu64 " already exists!", |
927 | channel->key); | |
821fffb2 | 928 | ret = -EEXIST; |
c77fc10a DG |
929 | goto end; |
930 | } | |
931 | ||
d88aee68 | 932 | lttng_ht_add_unique_u64(consumer_data.channel_ht, &channel->node); |
c77fc10a DG |
933 | |
934 | end: | |
6065ceec | 935 | rcu_read_unlock(); |
ec6ea7d0 | 936 | pthread_mutex_unlock(&channel->timer_lock); |
a9838785 | 937 | pthread_mutex_unlock(&channel->lock); |
3bd1e081 | 938 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 939 | |
d8ef542d | 940 | if (!ret && channel->wait_fd != -1 && |
10a50311 | 941 | channel->type == CONSUMER_CHANNEL_TYPE_DATA) { |
a0cbdd2e | 942 | notify_channel_pipe(ctx, channel, -1, CONSUMER_CHANNEL_ADD); |
d8ef542d | 943 | } |
ffe60014 | 944 | return ret; |
3bd1e081 MD |
945 | } |
946 | ||
947 | /* | |
948 | * Allocate the pollfd structure and the local view of the out fds to avoid | |
949 | * doing a lookup in the linked list and concurrency issues when writing is | |
950 | * needed. Called with consumer_data.lock held. | |
951 | * | |
952 | * Returns the number of fds in the structures. | |
953 | */ | |
ffe60014 DG |
954 | static int update_poll_array(struct lttng_consumer_local_data *ctx, |
955 | struct pollfd **pollfd, struct lttng_consumer_stream **local_stream, | |
956 | struct lttng_ht *ht) | |
3bd1e081 | 957 | { |
3bd1e081 | 958 | int i = 0; |
e4421fec DG |
959 | struct lttng_ht_iter iter; |
960 | struct lttng_consumer_stream *stream; | |
3bd1e081 | 961 | |
ffe60014 DG |
962 | assert(ctx); |
963 | assert(ht); | |
964 | assert(pollfd); | |
965 | assert(local_stream); | |
966 | ||
3bd1e081 | 967 | DBG("Updating poll fd array"); |
481d6c57 | 968 | rcu_read_lock(); |
43c34bc3 | 969 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { |
8994307f DG |
970 | /* |
971 | * Only active streams with an active end point can be added to the | |
972 | * poll set and local stream storage of the thread. | |
973 | * | |
974 | * There is a potential race here for endpoint_status to be updated | |
975 | * just after the check. However, this is OK since the stream(s) will | |
976 | * be deleted once the thread is notified that the end point state has | |
977 | * changed where this function will be called back again. | |
978 | */ | |
979 | if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM || | |
79d4ffb7 | 980 | stream->endpoint_status == CONSUMER_ENDPOINT_INACTIVE) { |
3bd1e081 MD |
981 | continue; |
982 | } | |
7972aab2 DG |
983 | /* |
984 | * This clobbers way too much the debug output. Uncomment that if you | |
985 | * need it for debugging purposes. | |
986 | * | |
987 | * DBG("Active FD %d", stream->wait_fd); | |
988 | */ | |
e4421fec | 989 | (*pollfd)[i].fd = stream->wait_fd; |
3bd1e081 | 990 | (*pollfd)[i].events = POLLIN | POLLPRI; |
e4421fec | 991 | local_stream[i] = stream; |
3bd1e081 MD |
992 | i++; |
993 | } | |
481d6c57 | 994 | rcu_read_unlock(); |
3bd1e081 MD |
995 | |
996 | /* | |
50f8ae69 | 997 | * Insert the consumer_data_pipe at the end of the array and don't |
3bd1e081 MD |
998 | * increment i so nb_fd is the number of real FD. |
999 | */ | |
acdb9057 | 1000 | (*pollfd)[i].fd = lttng_pipe_get_readfd(ctx->consumer_data_pipe); |
509bb1cf | 1001 | (*pollfd)[i].events = POLLIN | POLLPRI; |
3bd1e081 MD |
1002 | return i; |
1003 | } | |
1004 | ||
1005 | /* | |
1006 | * Poll on the should_quit pipe and the command socket return -1 on error and | |
1007 | * should exit, 0 if data is available on the command socket | |
1008 | */ | |
1009 | int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll) | |
1010 | { | |
1011 | int num_rdy; | |
1012 | ||
88f2b785 | 1013 | restart: |
3bd1e081 MD |
1014 | num_rdy = poll(consumer_sockpoll, 2, -1); |
1015 | if (num_rdy == -1) { | |
88f2b785 MD |
1016 | /* |
1017 | * Restart interrupted system call. | |
1018 | */ | |
1019 | if (errno == EINTR) { | |
1020 | goto restart; | |
1021 | } | |
7a57cf92 | 1022 | PERROR("Poll error"); |
3bd1e081 MD |
1023 | goto exit; |
1024 | } | |
509bb1cf | 1025 | if (consumer_sockpoll[0].revents & (POLLIN | POLLPRI)) { |
3bd1e081 MD |
1026 | DBG("consumer_should_quit wake up"); |
1027 | goto exit; | |
1028 | } | |
1029 | return 0; | |
1030 | ||
1031 | exit: | |
1032 | return -1; | |
1033 | } | |
1034 | ||
1035 | /* | |
1036 | * Set the error socket. | |
1037 | */ | |
ffe60014 DG |
1038 | void lttng_consumer_set_error_sock(struct lttng_consumer_local_data *ctx, |
1039 | int sock) | |
3bd1e081 MD |
1040 | { |
1041 | ctx->consumer_error_socket = sock; | |
1042 | } | |
1043 | ||
1044 | /* | |
1045 | * Set the command socket path. | |
1046 | */ | |
3bd1e081 MD |
1047 | void lttng_consumer_set_command_sock_path( |
1048 | struct lttng_consumer_local_data *ctx, char *sock) | |
1049 | { | |
1050 | ctx->consumer_command_sock_path = sock; | |
1051 | } | |
1052 | ||
1053 | /* | |
1054 | * Send return code to the session daemon. | |
1055 | * If the socket is not defined, we return 0, it is not a fatal error | |
1056 | */ | |
ffe60014 | 1057 | int lttng_consumer_send_error(struct lttng_consumer_local_data *ctx, int cmd) |
3bd1e081 MD |
1058 | { |
1059 | if (ctx->consumer_error_socket > 0) { | |
1060 | return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd, | |
1061 | sizeof(enum lttcomm_sessiond_command)); | |
1062 | } | |
1063 | ||
1064 | return 0; | |
1065 | } | |
1066 | ||
1067 | /* | |
228b5bf7 DG |
1068 | * Close all the tracefiles and stream fds and MUST be called when all |
1069 | * instances are destroyed i.e. when all threads were joined and are ended. | |
3bd1e081 MD |
1070 | */ |
1071 | void lttng_consumer_cleanup(void) | |
1072 | { | |
e4421fec | 1073 | struct lttng_ht_iter iter; |
ffe60014 | 1074 | struct lttng_consumer_channel *channel; |
6065ceec DG |
1075 | |
1076 | rcu_read_lock(); | |
3bd1e081 | 1077 | |
ffe60014 DG |
1078 | cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, channel, |
1079 | node.node) { | |
702b1ea4 | 1080 | consumer_del_channel(channel); |
3bd1e081 | 1081 | } |
6065ceec DG |
1082 | |
1083 | rcu_read_unlock(); | |
d6ce1df2 | 1084 | |
d6ce1df2 | 1085 | lttng_ht_destroy(consumer_data.channel_ht); |
228b5bf7 DG |
1086 | |
1087 | cleanup_relayd_ht(); | |
1088 | ||
d8ef542d MD |
1089 | lttng_ht_destroy(consumer_data.stream_per_chan_id_ht); |
1090 | ||
228b5bf7 DG |
1091 | /* |
1092 | * This HT contains streams that are freed by either the metadata thread or | |
1093 | * the data thread so we do *nothing* on the hash table and simply destroy | |
1094 | * it. | |
1095 | */ | |
1096 | lttng_ht_destroy(consumer_data.stream_list_ht); | |
3bd1e081 MD |
1097 | } |
1098 | ||
1099 | /* | |
1100 | * Called from signal handler. | |
1101 | */ | |
1102 | void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx) | |
1103 | { | |
1104 | int ret; | |
1105 | consumer_quit = 1; | |
6f94560a MD |
1106 | do { |
1107 | ret = write(ctx->consumer_should_quit[1], "4", 1); | |
1108 | } while (ret < 0 && errno == EINTR); | |
4cec016f | 1109 | if (ret < 0 || ret != 1) { |
7a57cf92 | 1110 | PERROR("write consumer quit"); |
3bd1e081 | 1111 | } |
ab1027f4 DG |
1112 | |
1113 | DBG("Consumer flag that it should quit"); | |
3bd1e081 MD |
1114 | } |
1115 | ||
00e2e675 DG |
1116 | void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream, |
1117 | off_t orig_offset) | |
3bd1e081 MD |
1118 | { |
1119 | int outfd = stream->out_fd; | |
1120 | ||
1121 | /* | |
1122 | * This does a blocking write-and-wait on any page that belongs to the | |
1123 | * subbuffer prior to the one we just wrote. | |
1124 | * Don't care about error values, as these are just hints and ways to | |
1125 | * limit the amount of page cache used. | |
1126 | */ | |
ffe60014 | 1127 | if (orig_offset < stream->max_sb_size) { |
3bd1e081 MD |
1128 | return; |
1129 | } | |
ffe60014 DG |
1130 | lttng_sync_file_range(outfd, orig_offset - stream->max_sb_size, |
1131 | stream->max_sb_size, | |
3bd1e081 MD |
1132 | SYNC_FILE_RANGE_WAIT_BEFORE |
1133 | | SYNC_FILE_RANGE_WRITE | |
1134 | | SYNC_FILE_RANGE_WAIT_AFTER); | |
1135 | /* | |
1136 | * Give hints to the kernel about how we access the file: | |
1137 | * POSIX_FADV_DONTNEED : we won't re-access data in a near future after | |
1138 | * we write it. | |
1139 | * | |
1140 | * We need to call fadvise again after the file grows because the | |
1141 | * kernel does not seem to apply fadvise to non-existing parts of the | |
1142 | * file. | |
1143 | * | |
1144 | * Call fadvise _after_ having waited for the page writeback to | |
1145 | * complete because the dirty page writeback semantic is not well | |
1146 | * defined. So it can be expected to lead to lower throughput in | |
1147 | * streaming. | |
1148 | */ | |
ffe60014 DG |
1149 | posix_fadvise(outfd, orig_offset - stream->max_sb_size, |
1150 | stream->max_sb_size, POSIX_FADV_DONTNEED); | |
3bd1e081 MD |
1151 | } |
1152 | ||
1153 | /* | |
1154 | * Initialise the necessary environnement : | |
1155 | * - create a new context | |
1156 | * - create the poll_pipe | |
1157 | * - create the should_quit pipe (for signal handler) | |
1158 | * - create the thread pipe (for splice) | |
1159 | * | |
1160 | * Takes a function pointer as argument, this function is called when data is | |
1161 | * available on a buffer. This function is responsible to do the | |
1162 | * kernctl_get_next_subbuf, read the data with mmap or splice depending on the | |
1163 | * buffer configuration and then kernctl_put_next_subbuf at the end. | |
1164 | * | |
1165 | * Returns a pointer to the new context or NULL on error. | |
1166 | */ | |
1167 | struct lttng_consumer_local_data *lttng_consumer_create( | |
1168 | enum lttng_consumer_type type, | |
4078b776 | 1169 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
d41f73b7 | 1170 | struct lttng_consumer_local_data *ctx), |
3bd1e081 MD |
1171 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
1172 | int (*recv_stream)(struct lttng_consumer_stream *stream), | |
30319bcb | 1173 | int (*update_stream)(uint64_t stream_key, uint32_t state)) |
3bd1e081 | 1174 | { |
d8ef542d | 1175 | int ret; |
3bd1e081 MD |
1176 | struct lttng_consumer_local_data *ctx; |
1177 | ||
1178 | assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN || | |
1179 | consumer_data.type == type); | |
1180 | consumer_data.type = type; | |
1181 | ||
effcf122 | 1182 | ctx = zmalloc(sizeof(struct lttng_consumer_local_data)); |
3bd1e081 | 1183 | if (ctx == NULL) { |
7a57cf92 | 1184 | PERROR("allocating context"); |
3bd1e081 MD |
1185 | goto error; |
1186 | } | |
1187 | ||
1188 | ctx->consumer_error_socket = -1; | |
331744e3 | 1189 | ctx->consumer_metadata_socket = -1; |
75d83e50 | 1190 | pthread_mutex_init(&ctx->metadata_socket_lock, NULL); |
3bd1e081 MD |
1191 | /* assign the callbacks */ |
1192 | ctx->on_buffer_ready = buffer_ready; | |
1193 | ctx->on_recv_channel = recv_channel; | |
1194 | ctx->on_recv_stream = recv_stream; | |
1195 | ctx->on_update_stream = update_stream; | |
1196 | ||
acdb9057 DG |
1197 | ctx->consumer_data_pipe = lttng_pipe_open(0); |
1198 | if (!ctx->consumer_data_pipe) { | |
3bd1e081 MD |
1199 | goto error_poll_pipe; |
1200 | } | |
1201 | ||
1202 | ret = pipe(ctx->consumer_should_quit); | |
1203 | if (ret < 0) { | |
7a57cf92 | 1204 | PERROR("Error creating recv pipe"); |
3bd1e081 MD |
1205 | goto error_quit_pipe; |
1206 | } | |
1207 | ||
1208 | ret = pipe(ctx->consumer_thread_pipe); | |
1209 | if (ret < 0) { | |
7a57cf92 | 1210 | PERROR("Error creating thread pipe"); |
3bd1e081 MD |
1211 | goto error_thread_pipe; |
1212 | } | |
1213 | ||
d8ef542d MD |
1214 | ret = pipe(ctx->consumer_channel_pipe); |
1215 | if (ret < 0) { | |
1216 | PERROR("Error creating channel pipe"); | |
1217 | goto error_channel_pipe; | |
1218 | } | |
1219 | ||
13886d2d DG |
1220 | ctx->consumer_metadata_pipe = lttng_pipe_open(0); |
1221 | if (!ctx->consumer_metadata_pipe) { | |
fb3a43a9 DG |
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 | 1232 | error_splice_pipe: |
13886d2d | 1233 | lttng_pipe_destroy(ctx->consumer_metadata_pipe); |
fb3a43a9 | 1234 | error_metadata_pipe: |
d8ef542d MD |
1235 | utils_close_pipe(ctx->consumer_channel_pipe); |
1236 | error_channel_pipe: | |
fb3a43a9 | 1237 | utils_close_pipe(ctx->consumer_thread_pipe); |
3bd1e081 | 1238 | error_thread_pipe: |
d8ef542d | 1239 | utils_close_pipe(ctx->consumer_should_quit); |
3bd1e081 | 1240 | error_quit_pipe: |
acdb9057 | 1241 | lttng_pipe_destroy(ctx->consumer_data_pipe); |
3bd1e081 MD |
1242 | error_poll_pipe: |
1243 | free(ctx); | |
1244 | error: | |
1245 | return NULL; | |
1246 | } | |
1247 | ||
1248 | /* | |
1249 | * Close all fds associated with the instance and free the context. | |
1250 | */ | |
1251 | void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx) | |
1252 | { | |
4c462e79 MD |
1253 | int ret; |
1254 | ||
ab1027f4 DG |
1255 | DBG("Consumer destroying it. Closing everything."); |
1256 | ||
4c462e79 MD |
1257 | ret = close(ctx->consumer_error_socket); |
1258 | if (ret) { | |
1259 | PERROR("close"); | |
1260 | } | |
331744e3 JD |
1261 | ret = close(ctx->consumer_metadata_socket); |
1262 | if (ret) { | |
1263 | PERROR("close"); | |
1264 | } | |
d8ef542d MD |
1265 | utils_close_pipe(ctx->consumer_thread_pipe); |
1266 | utils_close_pipe(ctx->consumer_channel_pipe); | |
acdb9057 | 1267 | lttng_pipe_destroy(ctx->consumer_data_pipe); |
13886d2d | 1268 | lttng_pipe_destroy(ctx->consumer_metadata_pipe); |
d8ef542d | 1269 | utils_close_pipe(ctx->consumer_should_quit); |
fb3a43a9 DG |
1270 | utils_close_pipe(ctx->consumer_splice_metadata_pipe); |
1271 | ||
3bd1e081 MD |
1272 | unlink(ctx->consumer_command_sock_path); |
1273 | free(ctx); | |
1274 | } | |
1275 | ||
6197aea7 DG |
1276 | /* |
1277 | * Write the metadata stream id on the specified file descriptor. | |
1278 | */ | |
1279 | static int write_relayd_metadata_id(int fd, | |
1280 | struct lttng_consumer_stream *stream, | |
ffe60014 | 1281 | struct consumer_relayd_sock_pair *relayd, unsigned long padding) |
6197aea7 DG |
1282 | { |
1283 | int ret; | |
1d4dfdef | 1284 | struct lttcomm_relayd_metadata_payload hdr; |
6197aea7 | 1285 | |
1d4dfdef DG |
1286 | hdr.stream_id = htobe64(stream->relayd_stream_id); |
1287 | hdr.padding_size = htobe32(padding); | |
6197aea7 | 1288 | do { |
1d4dfdef | 1289 | ret = write(fd, (void *) &hdr, sizeof(hdr)); |
6197aea7 | 1290 | } while (ret < 0 && errno == EINTR); |
4cec016f | 1291 | if (ret < 0 || ret != sizeof(hdr)) { |
d7b75ec8 DG |
1292 | /* |
1293 | * This error means that the fd's end is closed so ignore the perror | |
1294 | * not to clubber the error output since this can happen in a normal | |
1295 | * code path. | |
1296 | */ | |
1297 | if (errno != EPIPE) { | |
1298 | PERROR("write metadata stream id"); | |
1299 | } | |
1300 | DBG3("Consumer failed to write relayd metadata id (errno: %d)", errno); | |
534d2592 DG |
1301 | /* |
1302 | * Set ret to a negative value because if ret != sizeof(hdr), we don't | |
1303 | * handle writting the missing part so report that as an error and | |
1304 | * don't lie to the caller. | |
1305 | */ | |
1306 | ret = -1; | |
6197aea7 DG |
1307 | goto end; |
1308 | } | |
1d4dfdef DG |
1309 | DBG("Metadata stream id %" PRIu64 " with padding %lu written before data", |
1310 | stream->relayd_stream_id, padding); | |
6197aea7 DG |
1311 | |
1312 | end: | |
1313 | return ret; | |
1314 | } | |
1315 | ||
3bd1e081 | 1316 | /* |
09e26845 DG |
1317 | * Mmap the ring buffer, read it and write the data to the tracefile. This is a |
1318 | * core function for writing trace buffers to either the local filesystem or | |
1319 | * the network. | |
1320 | * | |
79d4ffb7 DG |
1321 | * It must be called with the stream lock held. |
1322 | * | |
09e26845 | 1323 | * Careful review MUST be put if any changes occur! |
3bd1e081 MD |
1324 | * |
1325 | * Returns the number of bytes written | |
1326 | */ | |
4078b776 | 1327 | ssize_t lttng_consumer_on_read_subbuffer_mmap( |
3bd1e081 | 1328 | struct lttng_consumer_local_data *ctx, |
1d4dfdef | 1329 | struct lttng_consumer_stream *stream, unsigned long len, |
309167d2 JD |
1330 | unsigned long padding, |
1331 | struct lttng_packet_index *index) | |
3bd1e081 | 1332 | { |
f02e1e8a | 1333 | unsigned long mmap_offset; |
ffe60014 | 1334 | void *mmap_base; |
f02e1e8a DG |
1335 | ssize_t ret = 0, written = 0; |
1336 | off_t orig_offset = stream->out_fd_offset; | |
1337 | /* Default is on the disk */ | |
1338 | int outfd = stream->out_fd; | |
f02e1e8a | 1339 | struct consumer_relayd_sock_pair *relayd = NULL; |
8994307f | 1340 | unsigned int relayd_hang_up = 0; |
f02e1e8a DG |
1341 | |
1342 | /* RCU lock for the relayd pointer */ | |
1343 | rcu_read_lock(); | |
1344 | ||
1345 | /* Flag that the current stream if set for network streaming. */ | |
da009f2c | 1346 | if (stream->net_seq_idx != (uint64_t) -1ULL) { |
f02e1e8a DG |
1347 | relayd = consumer_find_relayd(stream->net_seq_idx); |
1348 | if (relayd == NULL) { | |
56591bac | 1349 | ret = -EPIPE; |
f02e1e8a DG |
1350 | goto end; |
1351 | } | |
1352 | } | |
1353 | ||
1354 | /* get the offset inside the fd to mmap */ | |
3bd1e081 MD |
1355 | switch (consumer_data.type) { |
1356 | case LTTNG_CONSUMER_KERNEL: | |
ffe60014 | 1357 | mmap_base = stream->mmap_base; |
f02e1e8a | 1358 | ret = kernctl_get_mmap_read_offset(stream->wait_fd, &mmap_offset); |
56591bac MD |
1359 | if (ret != 0) { |
1360 | PERROR("tracer ctl get_mmap_read_offset"); | |
1361 | written = -errno; | |
1362 | goto end; | |
1363 | } | |
f02e1e8a | 1364 | break; |
7753dea8 MD |
1365 | case LTTNG_CONSUMER32_UST: |
1366 | case LTTNG_CONSUMER64_UST: | |
ffe60014 DG |
1367 | mmap_base = lttng_ustctl_get_mmap_base(stream); |
1368 | if (!mmap_base) { | |
1369 | ERR("read mmap get mmap base for stream %s", stream->name); | |
56591bac | 1370 | written = -EPERM; |
ffe60014 DG |
1371 | goto end; |
1372 | } | |
1373 | ret = lttng_ustctl_get_mmap_read_offset(stream, &mmap_offset); | |
56591bac MD |
1374 | if (ret != 0) { |
1375 | PERROR("tracer ctl get_mmap_read_offset"); | |
1376 | written = ret; | |
1377 | goto end; | |
1378 | } | |
f02e1e8a | 1379 | break; |
3bd1e081 MD |
1380 | default: |
1381 | ERR("Unknown consumer_data type"); | |
1382 | assert(0); | |
1383 | } | |
b9182dd9 | 1384 | |
f02e1e8a DG |
1385 | /* Handle stream on the relayd if the output is on the network */ |
1386 | if (relayd) { | |
1387 | unsigned long netlen = len; | |
1388 | ||
1389 | /* | |
1390 | * Lock the control socket for the complete duration of the function | |
1391 | * since from this point on we will use the socket. | |
1392 | */ | |
1393 | if (stream->metadata_flag) { | |
1394 | /* Metadata requires the control socket. */ | |
1395 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1d4dfdef | 1396 | netlen += sizeof(struct lttcomm_relayd_metadata_payload); |
f02e1e8a DG |
1397 | } |
1398 | ||
1d4dfdef | 1399 | ret = write_relayd_stream_header(stream, netlen, padding, relayd); |
f02e1e8a DG |
1400 | if (ret >= 0) { |
1401 | /* Use the returned socket. */ | |
1402 | outfd = ret; | |
1403 | ||
1404 | /* Write metadata stream id before payload */ | |
1405 | if (stream->metadata_flag) { | |
1d4dfdef | 1406 | ret = write_relayd_metadata_id(outfd, stream, relayd, padding); |
f02e1e8a | 1407 | if (ret < 0) { |
f02e1e8a | 1408 | written = ret; |
8994307f DG |
1409 | /* Socket operation failed. We consider the relayd dead */ |
1410 | if (ret == -EPIPE || ret == -EINVAL) { | |
1411 | relayd_hang_up = 1; | |
1412 | goto write_error; | |
1413 | } | |
f02e1e8a DG |
1414 | goto end; |
1415 | } | |
f02e1e8a | 1416 | } |
8994307f DG |
1417 | } else { |
1418 | /* Socket operation failed. We consider the relayd dead */ | |
1419 | if (ret == -EPIPE || ret == -EINVAL) { | |
1420 | relayd_hang_up = 1; | |
1421 | goto write_error; | |
1422 | } | |
1423 | /* Else, use the default set before which is the filesystem. */ | |
f02e1e8a | 1424 | } |
1d4dfdef DG |
1425 | } else { |
1426 | /* No streaming, we have to set the len with the full padding */ | |
1427 | len += padding; | |
1624d5b7 JD |
1428 | |
1429 | /* | |
1430 | * Check if we need to change the tracefile before writing the packet. | |
1431 | */ | |
1432 | if (stream->chan->tracefile_size > 0 && | |
1433 | (stream->tracefile_size_current + len) > | |
1434 | stream->chan->tracefile_size) { | |
fe4477ee JD |
1435 | ret = utils_rotate_stream_file(stream->chan->pathname, |
1436 | stream->name, stream->chan->tracefile_size, | |
1437 | stream->chan->tracefile_count, stream->uid, stream->gid, | |
309167d2 JD |
1438 | stream->out_fd, &(stream->tracefile_count_current), |
1439 | &stream->out_fd); | |
1624d5b7 JD |
1440 | if (ret < 0) { |
1441 | ERR("Rotating output file"); | |
1442 | goto end; | |
1443 | } | |
309167d2 JD |
1444 | outfd = stream->out_fd; |
1445 | ||
1446 | if (stream->index_fd >= 0) { | |
1447 | ret = index_create_file(stream->chan->pathname, | |
1448 | stream->name, stream->uid, stream->gid, | |
1449 | stream->chan->tracefile_size, | |
1450 | stream->tracefile_count_current); | |
1451 | if (ret < 0) { | |
1452 | goto end; | |
1453 | } | |
1454 | stream->index_fd = ret; | |
1455 | } | |
1456 | ||
a6976990 DG |
1457 | /* Reset current size because we just perform a rotation. */ |
1458 | stream->tracefile_size_current = 0; | |
a1ae300f JD |
1459 | stream->out_fd_offset = 0; |
1460 | orig_offset = 0; | |
1624d5b7 JD |
1461 | } |
1462 | stream->tracefile_size_current += len; | |
309167d2 JD |
1463 | if (index) { |
1464 | index->offset = htobe64(stream->out_fd_offset); | |
1465 | } | |
f02e1e8a DG |
1466 | } |
1467 | ||
1468 | while (len > 0) { | |
1469 | do { | |
ffe60014 | 1470 | ret = write(outfd, mmap_base + mmap_offset, len); |
f02e1e8a | 1471 | } while (ret < 0 && errno == EINTR); |
1d4dfdef | 1472 | DBG("Consumer mmap write() ret %zd (len %lu)", ret, len); |
f02e1e8a | 1473 | if (ret < 0) { |
c5c45efa DG |
1474 | /* |
1475 | * This is possible if the fd is closed on the other side (outfd) | |
1476 | * or any write problem. It can be verbose a bit for a normal | |
1477 | * execution if for instance the relayd is stopped abruptly. This | |
1478 | * can happen so set this to a DBG statement. | |
1479 | */ | |
1480 | DBG("Error in file write mmap"); | |
f02e1e8a | 1481 | if (written == 0) { |
56591bac | 1482 | written = -errno; |
f02e1e8a | 1483 | } |
8994307f DG |
1484 | /* Socket operation failed. We consider the relayd dead */ |
1485 | if (errno == EPIPE || errno == EINVAL) { | |
1486 | relayd_hang_up = 1; | |
1487 | goto write_error; | |
1488 | } | |
f02e1e8a DG |
1489 | goto end; |
1490 | } else if (ret > len) { | |
77c7c900 | 1491 | PERROR("Error in file write (ret %zd > len %lu)", ret, len); |
f02e1e8a DG |
1492 | written += ret; |
1493 | goto end; | |
1494 | } else { | |
1495 | len -= ret; | |
1496 | mmap_offset += ret; | |
1497 | } | |
f02e1e8a DG |
1498 | |
1499 | /* This call is useless on a socket so better save a syscall. */ | |
1500 | if (!relayd) { | |
1501 | /* This won't block, but will start writeout asynchronously */ | |
1502 | lttng_sync_file_range(outfd, stream->out_fd_offset, ret, | |
1503 | SYNC_FILE_RANGE_WRITE); | |
1504 | stream->out_fd_offset += ret; | |
1505 | } | |
e5d1a9b3 | 1506 | stream->output_written += ret; |
f02e1e8a DG |
1507 | written += ret; |
1508 | } | |
1509 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
1510 | ||
8994307f DG |
1511 | write_error: |
1512 | /* | |
1513 | * This is a special case that the relayd has closed its socket. Let's | |
1514 | * cleanup the relayd object and all associated streams. | |
1515 | */ | |
1516 | if (relayd && relayd_hang_up) { | |
1517 | cleanup_relayd(relayd, ctx); | |
1518 | } | |
1519 | ||
f02e1e8a DG |
1520 | end: |
1521 | /* Unlock only if ctrl socket used */ | |
1522 | if (relayd && stream->metadata_flag) { | |
1523 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1524 | } | |
1525 | ||
1526 | rcu_read_unlock(); | |
1527 | return written; | |
3bd1e081 MD |
1528 | } |
1529 | ||
1530 | /* | |
1531 | * Splice the data from the ring buffer to the tracefile. | |
1532 | * | |
79d4ffb7 DG |
1533 | * It must be called with the stream lock held. |
1534 | * | |
3bd1e081 MD |
1535 | * Returns the number of bytes spliced. |
1536 | */ | |
4078b776 | 1537 | ssize_t lttng_consumer_on_read_subbuffer_splice( |
3bd1e081 | 1538 | struct lttng_consumer_local_data *ctx, |
1d4dfdef | 1539 | struct lttng_consumer_stream *stream, unsigned long len, |
309167d2 JD |
1540 | unsigned long padding, |
1541 | struct lttng_packet_index *index) | |
3bd1e081 | 1542 | { |
f02e1e8a DG |
1543 | ssize_t ret = 0, written = 0, ret_splice = 0; |
1544 | loff_t offset = 0; | |
1545 | off_t orig_offset = stream->out_fd_offset; | |
1546 | int fd = stream->wait_fd; | |
1547 | /* Default is on the disk */ | |
1548 | int outfd = stream->out_fd; | |
f02e1e8a | 1549 | struct consumer_relayd_sock_pair *relayd = NULL; |
fb3a43a9 | 1550 | int *splice_pipe; |
8994307f | 1551 | unsigned int relayd_hang_up = 0; |
f02e1e8a | 1552 | |
3bd1e081 MD |
1553 | switch (consumer_data.type) { |
1554 | case LTTNG_CONSUMER_KERNEL: | |
f02e1e8a | 1555 | break; |
7753dea8 MD |
1556 | case LTTNG_CONSUMER32_UST: |
1557 | case LTTNG_CONSUMER64_UST: | |
f02e1e8a | 1558 | /* Not supported for user space tracing */ |
3bd1e081 MD |
1559 | return -ENOSYS; |
1560 | default: | |
1561 | ERR("Unknown consumer_data type"); | |
1562 | assert(0); | |
3bd1e081 MD |
1563 | } |
1564 | ||
f02e1e8a DG |
1565 | /* RCU lock for the relayd pointer */ |
1566 | rcu_read_lock(); | |
1567 | ||
1568 | /* Flag that the current stream if set for network streaming. */ | |
da009f2c | 1569 | if (stream->net_seq_idx != (uint64_t) -1ULL) { |
f02e1e8a DG |
1570 | relayd = consumer_find_relayd(stream->net_seq_idx); |
1571 | if (relayd == NULL) { | |
56591bac | 1572 | ret = -EPIPE; |
f02e1e8a DG |
1573 | goto end; |
1574 | } | |
1575 | } | |
1576 | ||
fb3a43a9 DG |
1577 | /* |
1578 | * Choose right pipe for splice. Metadata and trace data are handled by | |
1579 | * different threads hence the use of two pipes in order not to race or | |
1580 | * corrupt the written data. | |
1581 | */ | |
1582 | if (stream->metadata_flag) { | |
1583 | splice_pipe = ctx->consumer_splice_metadata_pipe; | |
1584 | } else { | |
1585 | splice_pipe = ctx->consumer_thread_pipe; | |
1586 | } | |
1587 | ||
f02e1e8a | 1588 | /* Write metadata stream id before payload */ |
1d4dfdef DG |
1589 | if (relayd) { |
1590 | int total_len = len; | |
f02e1e8a | 1591 | |
1d4dfdef DG |
1592 | if (stream->metadata_flag) { |
1593 | /* | |
1594 | * Lock the control socket for the complete duration of the function | |
1595 | * since from this point on we will use the socket. | |
1596 | */ | |
1597 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1598 | ||
1599 | ret = write_relayd_metadata_id(splice_pipe[1], stream, relayd, | |
1600 | padding); | |
1601 | if (ret < 0) { | |
1602 | written = ret; | |
8994307f DG |
1603 | /* Socket operation failed. We consider the relayd dead */ |
1604 | if (ret == -EBADF) { | |
1605 | WARN("Remote relayd disconnected. Stopping"); | |
1606 | relayd_hang_up = 1; | |
1607 | goto write_error; | |
1608 | } | |
1d4dfdef DG |
1609 | goto end; |
1610 | } | |
1611 | ||
1612 | total_len += sizeof(struct lttcomm_relayd_metadata_payload); | |
1613 | } | |
1614 | ||
1615 | ret = write_relayd_stream_header(stream, total_len, padding, relayd); | |
1616 | if (ret >= 0) { | |
1617 | /* Use the returned socket. */ | |
1618 | outfd = ret; | |
1619 | } else { | |
8994307f DG |
1620 | /* Socket operation failed. We consider the relayd dead */ |
1621 | if (ret == -EBADF) { | |
1622 | WARN("Remote relayd disconnected. Stopping"); | |
1623 | relayd_hang_up = 1; | |
1624 | goto write_error; | |
1625 | } | |
f02e1e8a DG |
1626 | goto end; |
1627 | } | |
1d4dfdef DG |
1628 | } else { |
1629 | /* No streaming, we have to set the len with the full padding */ | |
1630 | len += padding; | |
1624d5b7 JD |
1631 | |
1632 | /* | |
1633 | * Check if we need to change the tracefile before writing the packet. | |
1634 | */ | |
1635 | if (stream->chan->tracefile_size > 0 && | |
1636 | (stream->tracefile_size_current + len) > | |
1637 | stream->chan->tracefile_size) { | |
fe4477ee JD |
1638 | ret = utils_rotate_stream_file(stream->chan->pathname, |
1639 | stream->name, stream->chan->tracefile_size, | |
1640 | stream->chan->tracefile_count, stream->uid, stream->gid, | |
309167d2 JD |
1641 | stream->out_fd, &(stream->tracefile_count_current), |
1642 | &stream->out_fd); | |
1624d5b7 JD |
1643 | if (ret < 0) { |
1644 | ERR("Rotating output file"); | |
1645 | goto end; | |
1646 | } | |
309167d2 JD |
1647 | outfd = stream->out_fd; |
1648 | ||
1649 | if (stream->index_fd >= 0) { | |
1650 | ret = index_create_file(stream->chan->pathname, | |
1651 | stream->name, stream->uid, stream->gid, | |
1652 | stream->chan->tracefile_size, | |
1653 | stream->tracefile_count_current); | |
1654 | if (ret < 0) { | |
1655 | goto end; | |
1656 | } | |
1657 | stream->index_fd = ret; | |
1658 | } | |
1659 | ||
a6976990 DG |
1660 | /* Reset current size because we just perform a rotation. */ |
1661 | stream->tracefile_size_current = 0; | |
a1ae300f JD |
1662 | stream->out_fd_offset = 0; |
1663 | orig_offset = 0; | |
1624d5b7 JD |
1664 | } |
1665 | stream->tracefile_size_current += len; | |
309167d2 | 1666 | index->offset = htobe64(stream->out_fd_offset); |
f02e1e8a DG |
1667 | } |
1668 | ||
1669 | while (len > 0) { | |
1d4dfdef DG |
1670 | DBG("splice chan to pipe offset %lu of len %lu (fd : %d, pipe: %d)", |
1671 | (unsigned long)offset, len, fd, splice_pipe[1]); | |
fb3a43a9 | 1672 | ret_splice = splice(fd, &offset, splice_pipe[1], NULL, len, |
f02e1e8a DG |
1673 | SPLICE_F_MOVE | SPLICE_F_MORE); |
1674 | DBG("splice chan to pipe, ret %zd", ret_splice); | |
1675 | if (ret_splice < 0) { | |
1676 | PERROR("Error in relay splice"); | |
1677 | if (written == 0) { | |
1678 | written = ret_splice; | |
1679 | } | |
1680 | ret = errno; | |
1681 | goto splice_error; | |
1682 | } | |
1683 | ||
1684 | /* Handle stream on the relayd if the output is on the network */ | |
1685 | if (relayd) { | |
1686 | if (stream->metadata_flag) { | |
1d4dfdef DG |
1687 | size_t metadata_payload_size = |
1688 | sizeof(struct lttcomm_relayd_metadata_payload); | |
1689 | ||
f02e1e8a | 1690 | /* Update counter to fit the spliced data */ |
1d4dfdef DG |
1691 | ret_splice += metadata_payload_size; |
1692 | len += metadata_payload_size; | |
f02e1e8a DG |
1693 | /* |
1694 | * We do this so the return value can match the len passed as | |
1695 | * argument to this function. | |
1696 | */ | |
1d4dfdef | 1697 | written -= metadata_payload_size; |
f02e1e8a DG |
1698 | } |
1699 | } | |
1700 | ||
1701 | /* Splice data out */ | |
fb3a43a9 | 1702 | ret_splice = splice(splice_pipe[0], NULL, outfd, NULL, |
f02e1e8a | 1703 | ret_splice, SPLICE_F_MOVE | SPLICE_F_MORE); |
1d4dfdef | 1704 | DBG("Consumer splice pipe to file, ret %zd", ret_splice); |
f02e1e8a DG |
1705 | if (ret_splice < 0) { |
1706 | PERROR("Error in file splice"); | |
1707 | if (written == 0) { | |
1708 | written = ret_splice; | |
1709 | } | |
8994307f | 1710 | /* Socket operation failed. We consider the relayd dead */ |
00c8752b | 1711 | if (errno == EBADF || errno == EPIPE) { |
8994307f DG |
1712 | WARN("Remote relayd disconnected. Stopping"); |
1713 | relayd_hang_up = 1; | |
1714 | goto write_error; | |
1715 | } | |
f02e1e8a DG |
1716 | ret = errno; |
1717 | goto splice_error; | |
1718 | } else if (ret_splice > len) { | |
1719 | errno = EINVAL; | |
1720 | PERROR("Wrote more data than requested %zd (len: %lu)", | |
1721 | ret_splice, len); | |
1722 | written += ret_splice; | |
1723 | ret = errno; | |
1724 | goto splice_error; | |
1725 | } | |
1726 | len -= ret_splice; | |
1727 | ||
1728 | /* This call is useless on a socket so better save a syscall. */ | |
1729 | if (!relayd) { | |
1730 | /* This won't block, but will start writeout asynchronously */ | |
1731 | lttng_sync_file_range(outfd, stream->out_fd_offset, ret_splice, | |
1732 | SYNC_FILE_RANGE_WRITE); | |
1733 | stream->out_fd_offset += ret_splice; | |
1734 | } | |
e5d1a9b3 | 1735 | stream->output_written += ret_splice; |
f02e1e8a DG |
1736 | written += ret_splice; |
1737 | } | |
1738 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
1739 | ||
1740 | ret = ret_splice; | |
1741 | ||
1742 | goto end; | |
1743 | ||
8994307f DG |
1744 | write_error: |
1745 | /* | |
1746 | * This is a special case that the relayd has closed its socket. Let's | |
1747 | * cleanup the relayd object and all associated streams. | |
1748 | */ | |
1749 | if (relayd && relayd_hang_up) { | |
1750 | cleanup_relayd(relayd, ctx); | |
1751 | /* Skip splice error so the consumer does not fail */ | |
1752 | goto end; | |
1753 | } | |
1754 | ||
f02e1e8a DG |
1755 | splice_error: |
1756 | /* send the appropriate error description to sessiond */ | |
1757 | switch (ret) { | |
f02e1e8a | 1758 | case EINVAL: |
f73fabfd | 1759 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_EINVAL); |
f02e1e8a DG |
1760 | break; |
1761 | case ENOMEM: | |
f73fabfd | 1762 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ENOMEM); |
f02e1e8a DG |
1763 | break; |
1764 | case ESPIPE: | |
f73fabfd | 1765 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ESPIPE); |
f02e1e8a DG |
1766 | break; |
1767 | } | |
1768 | ||
1769 | end: | |
1770 | if (relayd && stream->metadata_flag) { | |
1771 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1772 | } | |
1773 | ||
1774 | rcu_read_unlock(); | |
1775 | return written; | |
3bd1e081 MD |
1776 | } |
1777 | ||
1778 | /* | |
1779 | * Take a snapshot for a specific fd | |
1780 | * | |
1781 | * Returns 0 on success, < 0 on error | |
1782 | */ | |
ffe60014 | 1783 | int lttng_consumer_take_snapshot(struct lttng_consumer_stream *stream) |
3bd1e081 MD |
1784 | { |
1785 | switch (consumer_data.type) { | |
1786 | case LTTNG_CONSUMER_KERNEL: | |
ffe60014 | 1787 | return lttng_kconsumer_take_snapshot(stream); |
7753dea8 MD |
1788 | case LTTNG_CONSUMER32_UST: |
1789 | case LTTNG_CONSUMER64_UST: | |
ffe60014 | 1790 | return lttng_ustconsumer_take_snapshot(stream); |
3bd1e081 MD |
1791 | default: |
1792 | ERR("Unknown consumer_data type"); | |
1793 | assert(0); | |
1794 | return -ENOSYS; | |
1795 | } | |
3bd1e081 MD |
1796 | } |
1797 | ||
1798 | /* | |
1799 | * Get the produced position | |
1800 | * | |
1801 | * Returns 0 on success, < 0 on error | |
1802 | */ | |
ffe60014 | 1803 | int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream *stream, |
3bd1e081 MD |
1804 | unsigned long *pos) |
1805 | { | |
1806 | switch (consumer_data.type) { | |
1807 | case LTTNG_CONSUMER_KERNEL: | |
ffe60014 | 1808 | return lttng_kconsumer_get_produced_snapshot(stream, pos); |
7753dea8 MD |
1809 | case LTTNG_CONSUMER32_UST: |
1810 | case LTTNG_CONSUMER64_UST: | |
ffe60014 | 1811 | return lttng_ustconsumer_get_produced_snapshot(stream, pos); |
3bd1e081 MD |
1812 | default: |
1813 | ERR("Unknown consumer_data type"); | |
1814 | assert(0); | |
1815 | return -ENOSYS; | |
1816 | } | |
1817 | } | |
1818 | ||
1819 | int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, | |
1820 | int sock, struct pollfd *consumer_sockpoll) | |
1821 | { | |
1822 | switch (consumer_data.type) { | |
1823 | case LTTNG_CONSUMER_KERNEL: | |
1824 | return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
7753dea8 MD |
1825 | case LTTNG_CONSUMER32_UST: |
1826 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1827 | return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll); |
1828 | default: | |
1829 | ERR("Unknown consumer_data type"); | |
1830 | assert(0); | |
1831 | return -ENOSYS; | |
1832 | } | |
1833 | } | |
1834 | ||
43c34bc3 DG |
1835 | /* |
1836 | * Iterate over all streams of the hashtable and free them properly. | |
1837 | * | |
1838 | * WARNING: *MUST* be used with data stream only. | |
1839 | */ | |
1840 | static void destroy_data_stream_ht(struct lttng_ht *ht) | |
1841 | { | |
43c34bc3 DG |
1842 | struct lttng_ht_iter iter; |
1843 | struct lttng_consumer_stream *stream; | |
1844 | ||
1845 | if (ht == NULL) { | |
1846 | return; | |
1847 | } | |
1848 | ||
1849 | rcu_read_lock(); | |
1850 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { | |
5c540210 DG |
1851 | /* |
1852 | * Ignore return value since we are currently cleaning up so any error | |
1853 | * can't be handled. | |
1854 | */ | |
1855 | (void) consumer_del_stream(stream, ht); | |
43c34bc3 DG |
1856 | } |
1857 | rcu_read_unlock(); | |
1858 | ||
1859 | lttng_ht_destroy(ht); | |
1860 | } | |
1861 | ||
fb3a43a9 | 1862 | /* |
f724d81e | 1863 | * Iterate over all streams of the hashtable and free them properly. |
e316aad5 DG |
1864 | * |
1865 | * XXX: Should not be only for metadata stream or else use an other name. | |
fb3a43a9 DG |
1866 | */ |
1867 | static void destroy_stream_ht(struct lttng_ht *ht) | |
1868 | { | |
fb3a43a9 DG |
1869 | struct lttng_ht_iter iter; |
1870 | struct lttng_consumer_stream *stream; | |
1871 | ||
1872 | if (ht == NULL) { | |
1873 | return; | |
1874 | } | |
1875 | ||
d09e1200 | 1876 | rcu_read_lock(); |
58b1f425 | 1877 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { |
5c540210 DG |
1878 | /* |
1879 | * Ignore return value since we are currently cleaning up so any error | |
1880 | * can't be handled. | |
1881 | */ | |
1882 | (void) consumer_del_metadata_stream(stream, ht); | |
fb3a43a9 | 1883 | } |
d09e1200 | 1884 | rcu_read_unlock(); |
fb3a43a9 DG |
1885 | |
1886 | lttng_ht_destroy(ht); | |
1887 | } | |
1888 | ||
d88aee68 DG |
1889 | void lttng_consumer_close_metadata(void) |
1890 | { | |
1891 | switch (consumer_data.type) { | |
1892 | case LTTNG_CONSUMER_KERNEL: | |
1893 | /* | |
1894 | * The Kernel consumer has a different metadata scheme so we don't | |
1895 | * close anything because the stream will be closed by the session | |
1896 | * daemon. | |
1897 | */ | |
1898 | break; | |
1899 | case LTTNG_CONSUMER32_UST: | |
1900 | case LTTNG_CONSUMER64_UST: | |
1901 | /* | |
1902 | * Close all metadata streams. The metadata hash table is passed and | |
1903 | * this call iterates over it by closing all wakeup fd. This is safe | |
1904 | * because at this point we are sure that the metadata producer is | |
1905 | * either dead or blocked. | |
1906 | */ | |
1907 | lttng_ustconsumer_close_metadata(metadata_ht); | |
1908 | break; | |
1909 | default: | |
1910 | ERR("Unknown consumer_data type"); | |
1911 | assert(0); | |
1912 | } | |
1913 | } | |
1914 | ||
fb3a43a9 DG |
1915 | /* |
1916 | * Clean up a metadata stream and free its memory. | |
1917 | */ | |
e316aad5 DG |
1918 | void consumer_del_metadata_stream(struct lttng_consumer_stream *stream, |
1919 | struct lttng_ht *ht) | |
fb3a43a9 DG |
1920 | { |
1921 | int ret; | |
e316aad5 DG |
1922 | struct lttng_ht_iter iter; |
1923 | struct lttng_consumer_channel *free_chan = NULL; | |
fb3a43a9 DG |
1924 | struct consumer_relayd_sock_pair *relayd; |
1925 | ||
1926 | assert(stream); | |
1927 | /* | |
1928 | * This call should NEVER receive regular stream. It must always be | |
1929 | * metadata stream and this is crucial for data structure synchronization. | |
1930 | */ | |
1931 | assert(stream->metadata_flag); | |
1932 | ||
e316aad5 DG |
1933 | DBG3("Consumer delete metadata stream %d", stream->wait_fd); |
1934 | ||
1935 | if (ht == NULL) { | |
1936 | /* Means the stream was allocated but not successfully added */ | |
ffe60014 | 1937 | goto free_stream_rcu; |
e316aad5 DG |
1938 | } |
1939 | ||
74251bb8 | 1940 | pthread_mutex_lock(&consumer_data.lock); |
a9838785 | 1941 | pthread_mutex_lock(&stream->chan->lock); |
8994307f DG |
1942 | pthread_mutex_lock(&stream->lock); |
1943 | ||
fb3a43a9 DG |
1944 | switch (consumer_data.type) { |
1945 | case LTTNG_CONSUMER_KERNEL: | |
1946 | if (stream->mmap_base != NULL) { | |
1947 | ret = munmap(stream->mmap_base, stream->mmap_len); | |
1948 | if (ret != 0) { | |
1949 | PERROR("munmap metadata stream"); | |
1950 | } | |
1951 | } | |
4c95e622 JD |
1952 | if (stream->wait_fd >= 0) { |
1953 | ret = close(stream->wait_fd); | |
1954 | if (ret < 0) { | |
1955 | PERROR("close kernel metadata wait_fd"); | |
1956 | } | |
1957 | } | |
fb3a43a9 DG |
1958 | break; |
1959 | case LTTNG_CONSUMER32_UST: | |
1960 | case LTTNG_CONSUMER64_UST: | |
04ef1097 MD |
1961 | if (stream->monitor) { |
1962 | /* close the write-side in close_metadata */ | |
1963 | ret = close(stream->ust_metadata_poll_pipe[0]); | |
1964 | if (ret < 0) { | |
1965 | PERROR("Close UST metadata read-side poll pipe"); | |
1966 | } | |
1967 | } | |
fb3a43a9 DG |
1968 | lttng_ustconsumer_del_stream(stream); |
1969 | break; | |
1970 | default: | |
1971 | ERR("Unknown consumer_data type"); | |
1972 | assert(0); | |
e316aad5 | 1973 | goto end; |
fb3a43a9 | 1974 | } |
fb3a43a9 | 1975 | |
c869f647 | 1976 | rcu_read_lock(); |
58b1f425 | 1977 | iter.iter.node = &stream->node.node; |
c869f647 DG |
1978 | ret = lttng_ht_del(ht, &iter); |
1979 | assert(!ret); | |
ca22feea | 1980 | |
d8ef542d MD |
1981 | iter.iter.node = &stream->node_channel_id.node; |
1982 | ret = lttng_ht_del(consumer_data.stream_per_chan_id_ht, &iter); | |
1983 | assert(!ret); | |
1984 | ||
ca22feea DG |
1985 | iter.iter.node = &stream->node_session_id.node; |
1986 | ret = lttng_ht_del(consumer_data.stream_list_ht, &iter); | |
1987 | assert(!ret); | |
c869f647 DG |
1988 | rcu_read_unlock(); |
1989 | ||
fb3a43a9 DG |
1990 | if (stream->out_fd >= 0) { |
1991 | ret = close(stream->out_fd); | |
1992 | if (ret) { | |
1993 | PERROR("close"); | |
1994 | } | |
1995 | } | |
1996 | ||
fb3a43a9 DG |
1997 | /* Check and cleanup relayd */ |
1998 | rcu_read_lock(); | |
1999 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
2000 | if (relayd != NULL) { | |
2001 | uatomic_dec(&relayd->refcount); | |
2002 | assert(uatomic_read(&relayd->refcount) >= 0); | |
2003 | ||
2004 | /* Closing streams requires to lock the control socket. */ | |
2005 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
2006 | ret = relayd_send_close_stream(&relayd->control_sock, | |
2007 | stream->relayd_stream_id, stream->next_net_seq_num - 1); | |
2008 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
2009 | if (ret < 0) { | |
2010 | DBG("Unable to close stream on the relayd. Continuing"); | |
2011 | /* | |
2012 | * Continue here. There is nothing we can do for the relayd. | |
2013 | * Chances are that the relayd has closed the socket so we just | |
2014 | * continue cleaning up. | |
2015 | */ | |
2016 | } | |
2017 | ||
2018 | /* Both conditions are met, we destroy the relayd. */ | |
2019 | if (uatomic_read(&relayd->refcount) == 0 && | |
2020 | uatomic_read(&relayd->destroy_flag)) { | |
51230d70 | 2021 | consumer_destroy_relayd(relayd); |
fb3a43a9 DG |
2022 | } |
2023 | } | |
2024 | rcu_read_unlock(); | |
2025 | ||
2026 | /* Atomically decrement channel refcount since other threads can use it. */ | |
f2ad556d | 2027 | if (!uatomic_sub_return(&stream->chan->refcount, 1) |
ffe60014 | 2028 | && !uatomic_read(&stream->chan->nb_init_stream_left)) { |
c30aaa51 | 2029 | /* Go for channel deletion! */ |
e316aad5 | 2030 | free_chan = stream->chan; |
fb3a43a9 DG |
2031 | } |
2032 | ||
e316aad5 | 2033 | end: |
73811ecc DG |
2034 | /* |
2035 | * Nullify the stream reference so it is not used after deletion. The | |
5e41ebe1 MD |
2036 | * channel lock MUST be acquired before being able to check for |
2037 | * a NULL pointer value. | |
73811ecc DG |
2038 | */ |
2039 | stream->chan->metadata_stream = NULL; | |
2040 | ||
8994307f | 2041 | pthread_mutex_unlock(&stream->lock); |
a9838785 | 2042 | pthread_mutex_unlock(&stream->chan->lock); |
74251bb8 | 2043 | pthread_mutex_unlock(&consumer_data.lock); |
e316aad5 DG |
2044 | |
2045 | if (free_chan) { | |
2046 | consumer_del_channel(free_chan); | |
2047 | } | |
2048 | ||
ffe60014 DG |
2049 | free_stream_rcu: |
2050 | call_rcu(&stream->node.head, free_stream_rcu); | |
fb3a43a9 DG |
2051 | } |
2052 | ||
2053 | /* | |
2054 | * Action done with the metadata stream when adding it to the consumer internal | |
2055 | * data structures to handle it. | |
2056 | */ | |
5ab66908 | 2057 | int consumer_add_metadata_stream(struct lttng_consumer_stream *stream) |
fb3a43a9 | 2058 | { |
5ab66908 | 2059 | struct lttng_ht *ht = metadata_ht; |
e316aad5 | 2060 | int ret = 0; |
76082088 | 2061 | struct lttng_ht_iter iter; |
d88aee68 | 2062 | struct lttng_ht_node_u64 *node; |
fb3a43a9 | 2063 | |
e316aad5 DG |
2064 | assert(stream); |
2065 | assert(ht); | |
2066 | ||
d88aee68 | 2067 | DBG3("Adding metadata stream %" PRIu64 " to hash table", stream->key); |
e316aad5 DG |
2068 | |
2069 | pthread_mutex_lock(&consumer_data.lock); | |
a9838785 | 2070 | pthread_mutex_lock(&stream->chan->lock); |
ec6ea7d0 | 2071 | pthread_mutex_lock(&stream->chan->timer_lock); |
2e818a6a | 2072 | pthread_mutex_lock(&stream->lock); |
e316aad5 | 2073 | |
e316aad5 DG |
2074 | /* |
2075 | * From here, refcounts are updated so be _careful_ when returning an error | |
2076 | * after this point. | |
2077 | */ | |
2078 | ||
fb3a43a9 | 2079 | rcu_read_lock(); |
76082088 DG |
2080 | |
2081 | /* | |
2082 | * Lookup the stream just to make sure it does not exist in our internal | |
2083 | * state. This should NEVER happen. | |
2084 | */ | |
d88aee68 DG |
2085 | lttng_ht_lookup(ht, &stream->key, &iter); |
2086 | node = lttng_ht_iter_get_node_u64(&iter); | |
76082088 DG |
2087 | assert(!node); |
2088 | ||
e316aad5 | 2089 | /* |
ffe60014 DG |
2090 | * When nb_init_stream_left reaches 0, we don't need to trigger any action |
2091 | * in terms of destroying the associated channel, because the action that | |
e316aad5 DG |
2092 | * causes the count to become 0 also causes a stream to be added. The |
2093 | * channel deletion will thus be triggered by the following removal of this | |
2094 | * stream. | |
2095 | */ | |
ffe60014 | 2096 | if (uatomic_read(&stream->chan->nb_init_stream_left) > 0) { |
f2ad556d MD |
2097 | /* Increment refcount before decrementing nb_init_stream_left */ |
2098 | cmm_smp_wmb(); | |
ffe60014 | 2099 | uatomic_dec(&stream->chan->nb_init_stream_left); |
e316aad5 DG |
2100 | } |
2101 | ||
d88aee68 | 2102 | lttng_ht_add_unique_u64(ht, &stream->node); |
ca22feea | 2103 | |
d8ef542d MD |
2104 | lttng_ht_add_unique_u64(consumer_data.stream_per_chan_id_ht, |
2105 | &stream->node_channel_id); | |
2106 | ||
ca22feea DG |
2107 | /* |
2108 | * Add stream to the stream_list_ht of the consumer data. No need to steal | |
2109 | * the key since the HT does not use it and we allow to add redundant keys | |
2110 | * into this table. | |
2111 | */ | |
d88aee68 | 2112 | lttng_ht_add_u64(consumer_data.stream_list_ht, &stream->node_session_id); |
ca22feea | 2113 | |
fb3a43a9 | 2114 | rcu_read_unlock(); |
e316aad5 | 2115 | |
2e818a6a | 2116 | pthread_mutex_unlock(&stream->lock); |
a9838785 | 2117 | pthread_mutex_unlock(&stream->chan->lock); |
ec6ea7d0 | 2118 | pthread_mutex_unlock(&stream->chan->timer_lock); |
e316aad5 DG |
2119 | pthread_mutex_unlock(&consumer_data.lock); |
2120 | return ret; | |
fb3a43a9 DG |
2121 | } |
2122 | ||
8994307f DG |
2123 | /* |
2124 | * Delete data stream that are flagged for deletion (endpoint_status). | |
2125 | */ | |
2126 | static void validate_endpoint_status_data_stream(void) | |
2127 | { | |
2128 | struct lttng_ht_iter iter; | |
2129 | struct lttng_consumer_stream *stream; | |
2130 | ||
2131 | DBG("Consumer delete flagged data stream"); | |
2132 | ||
2133 | rcu_read_lock(); | |
2134 | cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) { | |
2135 | /* Validate delete flag of the stream */ | |
79d4ffb7 | 2136 | if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) { |
8994307f DG |
2137 | continue; |
2138 | } | |
2139 | /* Delete it right now */ | |
2140 | consumer_del_stream(stream, data_ht); | |
2141 | } | |
2142 | rcu_read_unlock(); | |
2143 | } | |
2144 | ||
2145 | /* | |
2146 | * Delete metadata stream that are flagged for deletion (endpoint_status). | |
2147 | */ | |
2148 | static void validate_endpoint_status_metadata_stream( | |
2149 | struct lttng_poll_event *pollset) | |
2150 | { | |
2151 | struct lttng_ht_iter iter; | |
2152 | struct lttng_consumer_stream *stream; | |
2153 | ||
2154 | DBG("Consumer delete flagged metadata stream"); | |
2155 | ||
2156 | assert(pollset); | |
2157 | ||
2158 | rcu_read_lock(); | |
2159 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) { | |
2160 | /* Validate delete flag of the stream */ | |
79d4ffb7 | 2161 | if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) { |
8994307f DG |
2162 | continue; |
2163 | } | |
2164 | /* | |
2165 | * Remove from pollset so the metadata thread can continue without | |
2166 | * blocking on a deleted stream. | |
2167 | */ | |
2168 | lttng_poll_del(pollset, stream->wait_fd); | |
2169 | ||
2170 | /* Delete it right now */ | |
2171 | consumer_del_metadata_stream(stream, metadata_ht); | |
2172 | } | |
2173 | rcu_read_unlock(); | |
2174 | } | |
2175 | ||
fb3a43a9 DG |
2176 | /* |
2177 | * Thread polls on metadata file descriptor and write them on disk or on the | |
2178 | * network. | |
2179 | */ | |
7d980def | 2180 | void *consumer_thread_metadata_poll(void *data) |
fb3a43a9 DG |
2181 | { |
2182 | int ret, i, pollfd; | |
2183 | uint32_t revents, nb_fd; | |
e316aad5 | 2184 | struct lttng_consumer_stream *stream = NULL; |
fb3a43a9 | 2185 | struct lttng_ht_iter iter; |
d88aee68 | 2186 | struct lttng_ht_node_u64 *node; |
fb3a43a9 DG |
2187 | struct lttng_poll_event events; |
2188 | struct lttng_consumer_local_data *ctx = data; | |
2189 | ssize_t len; | |
2190 | ||
2191 | rcu_register_thread(); | |
2192 | ||
d88aee68 | 2193 | metadata_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
04bb2b64 DG |
2194 | if (!metadata_ht) { |
2195 | /* ENOMEM at this point. Better to bail out. */ | |
d8ef542d | 2196 | goto end_ht; |
04bb2b64 DG |
2197 | } |
2198 | ||
fb3a43a9 DG |
2199 | DBG("Thread metadata poll started"); |
2200 | ||
fb3a43a9 DG |
2201 | /* Size is set to 1 for the consumer_metadata pipe */ |
2202 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
2203 | if (ret < 0) { | |
2204 | ERR("Poll set creation failed"); | |
d8ef542d | 2205 | goto end_poll; |
fb3a43a9 DG |
2206 | } |
2207 | ||
13886d2d DG |
2208 | ret = lttng_poll_add(&events, |
2209 | lttng_pipe_get_readfd(ctx->consumer_metadata_pipe), LPOLLIN); | |
fb3a43a9 DG |
2210 | if (ret < 0) { |
2211 | goto end; | |
2212 | } | |
2213 | ||
2214 | /* Main loop */ | |
2215 | DBG("Metadata main loop started"); | |
2216 | ||
2217 | while (1) { | |
fb3a43a9 | 2218 | /* Only the metadata pipe is set */ |
d21b0d71 | 2219 | if (LTTNG_POLL_GETNB(&events) == 0 && consumer_quit == 1) { |
fb3a43a9 DG |
2220 | goto end; |
2221 | } | |
2222 | ||
2223 | restart: | |
d21b0d71 | 2224 | DBG("Metadata poll wait with %d fd(s)", LTTNG_POLL_GETNB(&events)); |
fb3a43a9 DG |
2225 | ret = lttng_poll_wait(&events, -1); |
2226 | DBG("Metadata event catched in thread"); | |
2227 | if (ret < 0) { | |
2228 | if (errno == EINTR) { | |
e316aad5 | 2229 | ERR("Poll EINTR catched"); |
fb3a43a9 DG |
2230 | goto restart; |
2231 | } | |
2232 | goto error; | |
2233 | } | |
2234 | ||
0d9c5d77 DG |
2235 | nb_fd = ret; |
2236 | ||
e316aad5 | 2237 | /* From here, the event is a metadata wait fd */ |
fb3a43a9 DG |
2238 | for (i = 0; i < nb_fd; i++) { |
2239 | revents = LTTNG_POLL_GETEV(&events, i); | |
2240 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2241 | ||
13886d2d | 2242 | if (pollfd == lttng_pipe_get_readfd(ctx->consumer_metadata_pipe)) { |
4adabd61 | 2243 | if (revents & (LPOLLERR | LPOLLHUP )) { |
fb3a43a9 DG |
2244 | DBG("Metadata thread pipe hung up"); |
2245 | /* | |
2246 | * Remove the pipe from the poll set and continue the loop | |
2247 | * since their might be data to consume. | |
2248 | */ | |
13886d2d DG |
2249 | lttng_poll_del(&events, |
2250 | lttng_pipe_get_readfd(ctx->consumer_metadata_pipe)); | |
2251 | lttng_pipe_read_close(ctx->consumer_metadata_pipe); | |
fb3a43a9 DG |
2252 | continue; |
2253 | } else if (revents & LPOLLIN) { | |
13886d2d DG |
2254 | ssize_t pipe_len; |
2255 | ||
2256 | pipe_len = lttng_pipe_read(ctx->consumer_metadata_pipe, | |
2257 | &stream, sizeof(stream)); | |
2258 | if (pipe_len < 0) { | |
6a00837f | 2259 | ERR("read metadata stream, ret: %zd", pipe_len); |
fb3a43a9 | 2260 | /* |
13886d2d | 2261 | * Continue here to handle the rest of the streams. |
fb3a43a9 DG |
2262 | */ |
2263 | continue; | |
2264 | } | |
2265 | ||
8994307f DG |
2266 | /* A NULL stream means that the state has changed. */ |
2267 | if (stream == NULL) { | |
2268 | /* Check for deleted streams. */ | |
2269 | validate_endpoint_status_metadata_stream(&events); | |
3714380f | 2270 | goto restart; |
8994307f DG |
2271 | } |
2272 | ||
fb3a43a9 DG |
2273 | DBG("Adding metadata stream %d to poll set", |
2274 | stream->wait_fd); | |
2275 | ||
fb3a43a9 DG |
2276 | /* Add metadata stream to the global poll events list */ |
2277 | lttng_poll_add(&events, stream->wait_fd, | |
2278 | LPOLLIN | LPOLLPRI); | |
fb3a43a9 DG |
2279 | } |
2280 | ||
e316aad5 | 2281 | /* Handle other stream */ |
fb3a43a9 DG |
2282 | continue; |
2283 | } | |
2284 | ||
d09e1200 | 2285 | rcu_read_lock(); |
d88aee68 DG |
2286 | { |
2287 | uint64_t tmp_id = (uint64_t) pollfd; | |
2288 | ||
2289 | lttng_ht_lookup(metadata_ht, &tmp_id, &iter); | |
2290 | } | |
2291 | node = lttng_ht_iter_get_node_u64(&iter); | |
e316aad5 | 2292 | assert(node); |
fb3a43a9 DG |
2293 | |
2294 | stream = caa_container_of(node, struct lttng_consumer_stream, | |
58b1f425 | 2295 | node); |
fb3a43a9 | 2296 | |
e316aad5 | 2297 | /* Check for error event */ |
4adabd61 | 2298 | if (revents & (LPOLLERR | LPOLLHUP)) { |
e316aad5 | 2299 | DBG("Metadata fd %d is hup|err.", pollfd); |
fb3a43a9 DG |
2300 | if (!stream->hangup_flush_done |
2301 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
2302 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
2303 | DBG("Attempting to flush and consume the UST buffers"); | |
2304 | lttng_ustconsumer_on_stream_hangup(stream); | |
2305 | ||
2306 | /* We just flushed the stream now read it. */ | |
4bb94b75 DG |
2307 | do { |
2308 | len = ctx->on_buffer_ready(stream, ctx); | |
2309 | /* | |
2310 | * We don't check the return value here since if we get | |
2311 | * a negative len, it means an error occured thus we | |
2312 | * simply remove it from the poll set and free the | |
2313 | * stream. | |
2314 | */ | |
2315 | } while (len > 0); | |
fb3a43a9 DG |
2316 | } |
2317 | ||
fb3a43a9 | 2318 | lttng_poll_del(&events, stream->wait_fd); |
e316aad5 DG |
2319 | /* |
2320 | * This call update the channel states, closes file descriptors | |
2321 | * and securely free the stream. | |
2322 | */ | |
2323 | consumer_del_metadata_stream(stream, metadata_ht); | |
2324 | } else if (revents & (LPOLLIN | LPOLLPRI)) { | |
2325 | /* Get the data out of the metadata file descriptor */ | |
2326 | DBG("Metadata available on fd %d", pollfd); | |
2327 | assert(stream->wait_fd == pollfd); | |
2328 | ||
04ef1097 MD |
2329 | do { |
2330 | len = ctx->on_buffer_ready(stream, ctx); | |
2331 | /* | |
2332 | * We don't check the return value here since if we get | |
2333 | * a negative len, it means an error occured thus we | |
2334 | * simply remove it from the poll set and free the | |
2335 | * stream. | |
2336 | */ | |
2337 | } while (len > 0); | |
2338 | ||
e316aad5 | 2339 | /* It's ok to have an unavailable sub-buffer */ |
b64403e3 | 2340 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2341 | /* Clean up stream from consumer and free it. */ |
2342 | lttng_poll_del(&events, stream->wait_fd); | |
2343 | consumer_del_metadata_stream(stream, metadata_ht); | |
e316aad5 | 2344 | } |
fb3a43a9 | 2345 | } |
e316aad5 DG |
2346 | |
2347 | /* Release RCU lock for the stream looked up */ | |
d09e1200 | 2348 | rcu_read_unlock(); |
fb3a43a9 DG |
2349 | } |
2350 | } | |
2351 | ||
2352 | error: | |
2353 | end: | |
2354 | DBG("Metadata poll thread exiting"); | |
fb3a43a9 | 2355 | |
d8ef542d MD |
2356 | lttng_poll_clean(&events); |
2357 | end_poll: | |
04bb2b64 | 2358 | destroy_stream_ht(metadata_ht); |
d8ef542d | 2359 | end_ht: |
fb3a43a9 DG |
2360 | rcu_unregister_thread(); |
2361 | return NULL; | |
2362 | } | |
2363 | ||
3bd1e081 | 2364 | /* |
e4421fec | 2365 | * This thread polls the fds in the set to consume the data and write |
3bd1e081 MD |
2366 | * it to tracefile if necessary. |
2367 | */ | |
7d980def | 2368 | void *consumer_thread_data_poll(void *data) |
3bd1e081 MD |
2369 | { |
2370 | int num_rdy, num_hup, high_prio, ret, i; | |
2371 | struct pollfd *pollfd = NULL; | |
2372 | /* local view of the streams */ | |
c869f647 | 2373 | struct lttng_consumer_stream **local_stream = NULL, *new_stream = NULL; |
3bd1e081 MD |
2374 | /* local view of consumer_data.fds_count */ |
2375 | int nb_fd = 0; | |
3bd1e081 | 2376 | struct lttng_consumer_local_data *ctx = data; |
00e2e675 | 2377 | ssize_t len; |
3bd1e081 | 2378 | |
e7b994a3 DG |
2379 | rcu_register_thread(); |
2380 | ||
d88aee68 | 2381 | data_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
43c34bc3 | 2382 | if (data_ht == NULL) { |
04bb2b64 | 2383 | /* ENOMEM at this point. Better to bail out. */ |
43c34bc3 DG |
2384 | goto end; |
2385 | } | |
2386 | ||
4df6c8cb MD |
2387 | local_stream = zmalloc(sizeof(struct lttng_consumer_stream *)); |
2388 | if (local_stream == NULL) { | |
2389 | PERROR("local_stream malloc"); | |
2390 | goto end; | |
2391 | } | |
3bd1e081 MD |
2392 | |
2393 | while (1) { | |
2394 | high_prio = 0; | |
2395 | num_hup = 0; | |
2396 | ||
2397 | /* | |
e4421fec | 2398 | * the fds set has been updated, we need to update our |
3bd1e081 MD |
2399 | * local array as well |
2400 | */ | |
2401 | pthread_mutex_lock(&consumer_data.lock); | |
2402 | if (consumer_data.need_update) { | |
0e428499 DG |
2403 | free(pollfd); |
2404 | pollfd = NULL; | |
2405 | ||
2406 | free(local_stream); | |
2407 | local_stream = NULL; | |
3bd1e081 | 2408 | |
50f8ae69 | 2409 | /* allocate for all fds + 1 for the consumer_data_pipe */ |
effcf122 | 2410 | pollfd = zmalloc((consumer_data.stream_count + 1) * sizeof(struct pollfd)); |
3bd1e081 | 2411 | if (pollfd == NULL) { |
7a57cf92 | 2412 | PERROR("pollfd malloc"); |
3bd1e081 MD |
2413 | pthread_mutex_unlock(&consumer_data.lock); |
2414 | goto end; | |
2415 | } | |
2416 | ||
50f8ae69 | 2417 | /* allocate for all fds + 1 for the consumer_data_pipe */ |
effcf122 | 2418 | local_stream = zmalloc((consumer_data.stream_count + 1) * |
747f8642 | 2419 | sizeof(struct lttng_consumer_stream *)); |
3bd1e081 | 2420 | if (local_stream == NULL) { |
7a57cf92 | 2421 | PERROR("local_stream malloc"); |
3bd1e081 MD |
2422 | pthread_mutex_unlock(&consumer_data.lock); |
2423 | goto end; | |
2424 | } | |
ffe60014 | 2425 | ret = update_poll_array(ctx, &pollfd, local_stream, |
43c34bc3 | 2426 | data_ht); |
3bd1e081 MD |
2427 | if (ret < 0) { |
2428 | ERR("Error in allocating pollfd or local_outfds"); | |
f73fabfd | 2429 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
2430 | pthread_mutex_unlock(&consumer_data.lock); |
2431 | goto end; | |
2432 | } | |
2433 | nb_fd = ret; | |
2434 | consumer_data.need_update = 0; | |
2435 | } | |
2436 | pthread_mutex_unlock(&consumer_data.lock); | |
2437 | ||
4078b776 MD |
2438 | /* No FDs and consumer_quit, consumer_cleanup the thread */ |
2439 | if (nb_fd == 0 && consumer_quit == 1) { | |
2440 | goto end; | |
2441 | } | |
3bd1e081 | 2442 | /* poll on the array of fds */ |
88f2b785 | 2443 | restart: |
3bd1e081 | 2444 | DBG("polling on %d fd", nb_fd + 1); |
cb365c03 | 2445 | num_rdy = poll(pollfd, nb_fd + 1, -1); |
3bd1e081 MD |
2446 | DBG("poll num_rdy : %d", num_rdy); |
2447 | if (num_rdy == -1) { | |
88f2b785 MD |
2448 | /* |
2449 | * Restart interrupted system call. | |
2450 | */ | |
2451 | if (errno == EINTR) { | |
2452 | goto restart; | |
2453 | } | |
7a57cf92 | 2454 | PERROR("Poll error"); |
f73fabfd | 2455 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
2456 | goto end; |
2457 | } else if (num_rdy == 0) { | |
2458 | DBG("Polling thread timed out"); | |
2459 | goto end; | |
2460 | } | |
2461 | ||
3bd1e081 | 2462 | /* |
50f8ae69 | 2463 | * If the consumer_data_pipe triggered poll go directly to the |
00e2e675 DG |
2464 | * beginning of the loop to update the array. We want to prioritize |
2465 | * array update over low-priority reads. | |
3bd1e081 | 2466 | */ |
509bb1cf | 2467 | if (pollfd[nb_fd].revents & (POLLIN | POLLPRI)) { |
ab30f567 | 2468 | ssize_t pipe_readlen; |
04fdd819 | 2469 | |
50f8ae69 | 2470 | DBG("consumer_data_pipe wake up"); |
acdb9057 DG |
2471 | pipe_readlen = lttng_pipe_read(ctx->consumer_data_pipe, |
2472 | &new_stream, sizeof(new_stream)); | |
23f5f35d | 2473 | if (pipe_readlen < 0) { |
6a00837f | 2474 | ERR("Consumer data pipe ret %zd", pipe_readlen); |
23f5f35d DG |
2475 | /* Continue so we can at least handle the current stream(s). */ |
2476 | continue; | |
2477 | } | |
c869f647 DG |
2478 | |
2479 | /* | |
2480 | * If the stream is NULL, just ignore it. It's also possible that | |
2481 | * the sessiond poll thread changed the consumer_quit state and is | |
2482 | * waking us up to test it. | |
2483 | */ | |
2484 | if (new_stream == NULL) { | |
8994307f | 2485 | validate_endpoint_status_data_stream(); |
c869f647 DG |
2486 | continue; |
2487 | } | |
2488 | ||
c869f647 | 2489 | /* Continue to update the local streams and handle prio ones */ |
3bd1e081 MD |
2490 | continue; |
2491 | } | |
2492 | ||
2493 | /* Take care of high priority channels first. */ | |
2494 | for (i = 0; i < nb_fd; i++) { | |
9617607b DG |
2495 | if (local_stream[i] == NULL) { |
2496 | continue; | |
2497 | } | |
fb3a43a9 | 2498 | if (pollfd[i].revents & POLLPRI) { |
d41f73b7 MD |
2499 | DBG("Urgent read on fd %d", pollfd[i].fd); |
2500 | high_prio = 1; | |
4078b776 | 2501 | len = ctx->on_buffer_ready(local_stream[i], ctx); |
d41f73b7 | 2502 | /* it's ok to have an unavailable sub-buffer */ |
b64403e3 | 2503 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2504 | /* Clean the stream and free it. */ |
2505 | consumer_del_stream(local_stream[i], data_ht); | |
9617607b | 2506 | local_stream[i] = NULL; |
4078b776 MD |
2507 | } else if (len > 0) { |
2508 | local_stream[i]->data_read = 1; | |
d41f73b7 | 2509 | } |
3bd1e081 MD |
2510 | } |
2511 | } | |
2512 | ||
4078b776 MD |
2513 | /* |
2514 | * If we read high prio channel in this loop, try again | |
2515 | * for more high prio data. | |
2516 | */ | |
2517 | if (high_prio) { | |
3bd1e081 MD |
2518 | continue; |
2519 | } | |
2520 | ||
2521 | /* Take care of low priority channels. */ | |
4078b776 | 2522 | for (i = 0; i < nb_fd; i++) { |
9617607b DG |
2523 | if (local_stream[i] == NULL) { |
2524 | continue; | |
2525 | } | |
4078b776 MD |
2526 | if ((pollfd[i].revents & POLLIN) || |
2527 | local_stream[i]->hangup_flush_done) { | |
4078b776 MD |
2528 | DBG("Normal read on fd %d", pollfd[i].fd); |
2529 | len = ctx->on_buffer_ready(local_stream[i], ctx); | |
2530 | /* it's ok to have an unavailable sub-buffer */ | |
b64403e3 | 2531 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2532 | /* Clean the stream and free it. */ |
2533 | consumer_del_stream(local_stream[i], data_ht); | |
9617607b | 2534 | local_stream[i] = NULL; |
4078b776 MD |
2535 | } else if (len > 0) { |
2536 | local_stream[i]->data_read = 1; | |
2537 | } | |
2538 | } | |
2539 | } | |
2540 | ||
2541 | /* Handle hangup and errors */ | |
2542 | for (i = 0; i < nb_fd; i++) { | |
9617607b DG |
2543 | if (local_stream[i] == NULL) { |
2544 | continue; | |
2545 | } | |
4078b776 MD |
2546 | if (!local_stream[i]->hangup_flush_done |
2547 | && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL)) | |
2548 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
2549 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
2550 | DBG("fd %d is hup|err|nval. Attempting flush and read.", | |
9617607b | 2551 | pollfd[i].fd); |
4078b776 MD |
2552 | lttng_ustconsumer_on_stream_hangup(local_stream[i]); |
2553 | /* Attempt read again, for the data we just flushed. */ | |
2554 | local_stream[i]->data_read = 1; | |
2555 | } | |
2556 | /* | |
2557 | * If the poll flag is HUP/ERR/NVAL and we have | |
2558 | * read no data in this pass, we can remove the | |
2559 | * stream from its hash table. | |
2560 | */ | |
2561 | if ((pollfd[i].revents & POLLHUP)) { | |
2562 | DBG("Polling fd %d tells it has hung up.", pollfd[i].fd); | |
2563 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2564 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2565 | local_stream[i] = NULL; |
4078b776 MD |
2566 | num_hup++; |
2567 | } | |
2568 | } else if (pollfd[i].revents & POLLERR) { | |
2569 | ERR("Error returned in polling fd %d.", pollfd[i].fd); | |
2570 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2571 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2572 | local_stream[i] = NULL; |
4078b776 MD |
2573 | num_hup++; |
2574 | } | |
2575 | } else if (pollfd[i].revents & POLLNVAL) { | |
2576 | ERR("Polling fd %d tells fd is not open.", pollfd[i].fd); | |
2577 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2578 | consumer_del_stream(local_stream[i], data_ht); |
9617607b | 2579 | local_stream[i] = NULL; |
4078b776 | 2580 | num_hup++; |
3bd1e081 MD |
2581 | } |
2582 | } | |
9617607b DG |
2583 | if (local_stream[i] != NULL) { |
2584 | local_stream[i]->data_read = 0; | |
2585 | } | |
3bd1e081 MD |
2586 | } |
2587 | } | |
2588 | end: | |
2589 | DBG("polling thread exiting"); | |
0e428499 DG |
2590 | free(pollfd); |
2591 | free(local_stream); | |
fb3a43a9 DG |
2592 | |
2593 | /* | |
2594 | * Close the write side of the pipe so epoll_wait() in | |
7d980def DG |
2595 | * consumer_thread_metadata_poll can catch it. The thread is monitoring the |
2596 | * read side of the pipe. If we close them both, epoll_wait strangely does | |
2597 | * not return and could create a endless wait period if the pipe is the | |
2598 | * only tracked fd in the poll set. The thread will take care of closing | |
2599 | * the read side. | |
fb3a43a9 | 2600 | */ |
13886d2d | 2601 | (void) lttng_pipe_write_close(ctx->consumer_metadata_pipe); |
fb3a43a9 | 2602 | |
04bb2b64 | 2603 | destroy_data_stream_ht(data_ht); |
43c34bc3 | 2604 | |
e7b994a3 | 2605 | rcu_unregister_thread(); |
3bd1e081 MD |
2606 | return NULL; |
2607 | } | |
2608 | ||
d8ef542d MD |
2609 | /* |
2610 | * Close wake-up end of each stream belonging to the channel. This will | |
2611 | * allow the poll() on the stream read-side to detect when the | |
2612 | * write-side (application) finally closes them. | |
2613 | */ | |
2614 | static | |
2615 | void consumer_close_channel_streams(struct lttng_consumer_channel *channel) | |
2616 | { | |
2617 | struct lttng_ht *ht; | |
2618 | struct lttng_consumer_stream *stream; | |
2619 | struct lttng_ht_iter iter; | |
2620 | ||
2621 | ht = consumer_data.stream_per_chan_id_ht; | |
2622 | ||
2623 | rcu_read_lock(); | |
2624 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
2625 | ht->hash_fct(&channel->key, lttng_ht_seed), | |
2626 | ht->match_fct, &channel->key, | |
2627 | &iter.iter, stream, node_channel_id.node) { | |
f2ad556d MD |
2628 | /* |
2629 | * Protect against teardown with mutex. | |
2630 | */ | |
2631 | pthread_mutex_lock(&stream->lock); | |
2632 | if (cds_lfht_is_node_deleted(&stream->node.node)) { | |
2633 | goto next; | |
2634 | } | |
d8ef542d MD |
2635 | switch (consumer_data.type) { |
2636 | case LTTNG_CONSUMER_KERNEL: | |
2637 | break; | |
2638 | case LTTNG_CONSUMER32_UST: | |
2639 | case LTTNG_CONSUMER64_UST: | |
2640 | /* | |
2641 | * Note: a mutex is taken internally within | |
2642 | * liblttng-ust-ctl to protect timer wakeup_fd | |
2643 | * use from concurrent close. | |
2644 | */ | |
2645 | lttng_ustconsumer_close_stream_wakeup(stream); | |
2646 | break; | |
2647 | default: | |
2648 | ERR("Unknown consumer_data type"); | |
2649 | assert(0); | |
2650 | } | |
f2ad556d MD |
2651 | next: |
2652 | pthread_mutex_unlock(&stream->lock); | |
d8ef542d MD |
2653 | } |
2654 | rcu_read_unlock(); | |
2655 | } | |
2656 | ||
2657 | static void destroy_channel_ht(struct lttng_ht *ht) | |
2658 | { | |
2659 | struct lttng_ht_iter iter; | |
2660 | struct lttng_consumer_channel *channel; | |
2661 | int ret; | |
2662 | ||
2663 | if (ht == NULL) { | |
2664 | return; | |
2665 | } | |
2666 | ||
2667 | rcu_read_lock(); | |
2668 | cds_lfht_for_each_entry(ht->ht, &iter.iter, channel, wait_fd_node.node) { | |
2669 | ret = lttng_ht_del(ht, &iter); | |
2670 | assert(ret != 0); | |
2671 | } | |
2672 | rcu_read_unlock(); | |
2673 | ||
2674 | lttng_ht_destroy(ht); | |
2675 | } | |
2676 | ||
2677 | /* | |
2678 | * This thread polls the channel fds to detect when they are being | |
2679 | * closed. It closes all related streams if the channel is detected as | |
2680 | * closed. It is currently only used as a shim layer for UST because the | |
2681 | * consumerd needs to keep the per-stream wakeup end of pipes open for | |
2682 | * periodical flush. | |
2683 | */ | |
2684 | void *consumer_thread_channel_poll(void *data) | |
2685 | { | |
2686 | int ret, i, pollfd; | |
2687 | uint32_t revents, nb_fd; | |
2688 | struct lttng_consumer_channel *chan = NULL; | |
2689 | struct lttng_ht_iter iter; | |
2690 | struct lttng_ht_node_u64 *node; | |
2691 | struct lttng_poll_event events; | |
2692 | struct lttng_consumer_local_data *ctx = data; | |
2693 | struct lttng_ht *channel_ht; | |
2694 | ||
2695 | rcu_register_thread(); | |
2696 | ||
2697 | channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); | |
2698 | if (!channel_ht) { | |
2699 | /* ENOMEM at this point. Better to bail out. */ | |
2700 | goto end_ht; | |
2701 | } | |
2702 | ||
2703 | DBG("Thread channel poll started"); | |
2704 | ||
2705 | /* Size is set to 1 for the consumer_channel pipe */ | |
2706 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
2707 | if (ret < 0) { | |
2708 | ERR("Poll set creation failed"); | |
2709 | goto end_poll; | |
2710 | } | |
2711 | ||
2712 | ret = lttng_poll_add(&events, ctx->consumer_channel_pipe[0], LPOLLIN); | |
2713 | if (ret < 0) { | |
2714 | goto end; | |
2715 | } | |
2716 | ||
2717 | /* Main loop */ | |
2718 | DBG("Channel main loop started"); | |
2719 | ||
2720 | while (1) { | |
2721 | /* Only the channel pipe is set */ | |
2722 | if (LTTNG_POLL_GETNB(&events) == 0 && consumer_quit == 1) { | |
2723 | goto end; | |
2724 | } | |
2725 | ||
2726 | restart: | |
2727 | DBG("Channel poll wait with %d fd(s)", LTTNG_POLL_GETNB(&events)); | |
2728 | ret = lttng_poll_wait(&events, -1); | |
2729 | DBG("Channel event catched in thread"); | |
2730 | if (ret < 0) { | |
2731 | if (errno == EINTR) { | |
2732 | ERR("Poll EINTR catched"); | |
2733 | goto restart; | |
2734 | } | |
2735 | goto end; | |
2736 | } | |
2737 | ||
2738 | nb_fd = ret; | |
2739 | ||
2740 | /* From here, the event is a channel wait fd */ | |
2741 | for (i = 0; i < nb_fd; i++) { | |
2742 | revents = LTTNG_POLL_GETEV(&events, i); | |
2743 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2744 | ||
2745 | /* Just don't waste time if no returned events for the fd */ | |
2746 | if (!revents) { | |
2747 | continue; | |
2748 | } | |
2749 | if (pollfd == ctx->consumer_channel_pipe[0]) { | |
2750 | if (revents & (LPOLLERR | LPOLLHUP)) { | |
2751 | DBG("Channel thread pipe hung up"); | |
2752 | /* | |
2753 | * Remove the pipe from the poll set and continue the loop | |
2754 | * since their might be data to consume. | |
2755 | */ | |
2756 | lttng_poll_del(&events, ctx->consumer_channel_pipe[0]); | |
2757 | continue; | |
2758 | } else if (revents & LPOLLIN) { | |
2759 | enum consumer_channel_action action; | |
a0cbdd2e | 2760 | uint64_t key; |
d8ef542d | 2761 | |
a0cbdd2e | 2762 | ret = read_channel_pipe(ctx, &chan, &key, &action); |
d8ef542d MD |
2763 | if (ret <= 0) { |
2764 | ERR("Error reading channel pipe"); | |
2765 | continue; | |
2766 | } | |
2767 | ||
2768 | switch (action) { | |
2769 | case CONSUMER_CHANNEL_ADD: | |
2770 | DBG("Adding channel %d to poll set", | |
2771 | chan->wait_fd); | |
2772 | ||
2773 | lttng_ht_node_init_u64(&chan->wait_fd_node, | |
2774 | chan->wait_fd); | |
c7260a81 | 2775 | rcu_read_lock(); |
d8ef542d MD |
2776 | lttng_ht_add_unique_u64(channel_ht, |
2777 | &chan->wait_fd_node); | |
c7260a81 | 2778 | rcu_read_unlock(); |
d8ef542d MD |
2779 | /* Add channel to the global poll events list */ |
2780 | lttng_poll_add(&events, chan->wait_fd, | |
2781 | LPOLLIN | LPOLLPRI); | |
2782 | break; | |
a0cbdd2e MD |
2783 | case CONSUMER_CHANNEL_DEL: |
2784 | { | |
f2a444f1 DG |
2785 | struct lttng_consumer_stream *stream, *stmp; |
2786 | ||
c7260a81 | 2787 | rcu_read_lock(); |
a0cbdd2e MD |
2788 | chan = consumer_find_channel(key); |
2789 | if (!chan) { | |
c7260a81 | 2790 | rcu_read_unlock(); |
a0cbdd2e MD |
2791 | ERR("UST consumer get channel key %" PRIu64 " not found for del channel", key); |
2792 | break; | |
2793 | } | |
2794 | lttng_poll_del(&events, chan->wait_fd); | |
f623cc0b | 2795 | iter.iter.node = &chan->wait_fd_node.node; |
a0cbdd2e MD |
2796 | ret = lttng_ht_del(channel_ht, &iter); |
2797 | assert(ret == 0); | |
2798 | consumer_close_channel_streams(chan); | |
2799 | ||
f2a444f1 DG |
2800 | switch (consumer_data.type) { |
2801 | case LTTNG_CONSUMER_KERNEL: | |
2802 | break; | |
2803 | case LTTNG_CONSUMER32_UST: | |
2804 | case LTTNG_CONSUMER64_UST: | |
2805 | /* Delete streams that might have been left in the stream list. */ | |
2806 | cds_list_for_each_entry_safe(stream, stmp, &chan->streams.head, | |
2807 | send_node) { | |
2808 | cds_list_del(&stream->send_node); | |
2809 | lttng_ustconsumer_del_stream(stream); | |
2810 | uatomic_sub(&stream->chan->refcount, 1); | |
2811 | assert(&chan->refcount); | |
2812 | free(stream); | |
2813 | } | |
2814 | break; | |
2815 | default: | |
2816 | ERR("Unknown consumer_data type"); | |
2817 | assert(0); | |
2818 | } | |
2819 | ||
a0cbdd2e MD |
2820 | /* |
2821 | * Release our own refcount. Force channel deletion even if | |
2822 | * streams were not initialized. | |
2823 | */ | |
2824 | if (!uatomic_sub_return(&chan->refcount, 1)) { | |
2825 | consumer_del_channel(chan); | |
2826 | } | |
c7260a81 | 2827 | rcu_read_unlock(); |
a0cbdd2e MD |
2828 | goto restart; |
2829 | } | |
d8ef542d MD |
2830 | case CONSUMER_CHANNEL_QUIT: |
2831 | /* | |
2832 | * Remove the pipe from the poll set and continue the loop | |
2833 | * since their might be data to consume. | |
2834 | */ | |
2835 | lttng_poll_del(&events, ctx->consumer_channel_pipe[0]); | |
2836 | continue; | |
2837 | default: | |
2838 | ERR("Unknown action"); | |
2839 | break; | |
2840 | } | |
2841 | } | |
2842 | ||
2843 | /* Handle other stream */ | |
2844 | continue; | |
2845 | } | |
2846 | ||
2847 | rcu_read_lock(); | |
2848 | { | |
2849 | uint64_t tmp_id = (uint64_t) pollfd; | |
2850 | ||
2851 | lttng_ht_lookup(channel_ht, &tmp_id, &iter); | |
2852 | } | |
2853 | node = lttng_ht_iter_get_node_u64(&iter); | |
2854 | assert(node); | |
2855 | ||
2856 | chan = caa_container_of(node, struct lttng_consumer_channel, | |
2857 | wait_fd_node); | |
2858 | ||
2859 | /* Check for error event */ | |
2860 | if (revents & (LPOLLERR | LPOLLHUP)) { | |
2861 | DBG("Channel fd %d is hup|err.", pollfd); | |
2862 | ||
2863 | lttng_poll_del(&events, chan->wait_fd); | |
2864 | ret = lttng_ht_del(channel_ht, &iter); | |
2865 | assert(ret == 0); | |
2866 | consumer_close_channel_streams(chan); | |
f2ad556d MD |
2867 | |
2868 | /* Release our own refcount */ | |
2869 | if (!uatomic_sub_return(&chan->refcount, 1) | |
2870 | && !uatomic_read(&chan->nb_init_stream_left)) { | |
2871 | consumer_del_channel(chan); | |
2872 | } | |
d8ef542d MD |
2873 | } |
2874 | ||
2875 | /* Release RCU lock for the channel looked up */ | |
2876 | rcu_read_unlock(); | |
2877 | } | |
2878 | } | |
2879 | ||
2880 | end: | |
2881 | lttng_poll_clean(&events); | |
2882 | end_poll: | |
2883 | destroy_channel_ht(channel_ht); | |
2884 | end_ht: | |
2885 | DBG("Channel poll thread exiting"); | |
2886 | rcu_unregister_thread(); | |
2887 | return NULL; | |
2888 | } | |
2889 | ||
331744e3 JD |
2890 | static int set_metadata_socket(struct lttng_consumer_local_data *ctx, |
2891 | struct pollfd *sockpoll, int client_socket) | |
2892 | { | |
2893 | int ret; | |
2894 | ||
2895 | assert(ctx); | |
2896 | assert(sockpoll); | |
2897 | ||
2898 | if (lttng_consumer_poll_socket(sockpoll) < 0) { | |
2899 | ret = -1; | |
2900 | goto error; | |
2901 | } | |
2902 | DBG("Metadata connection on client_socket"); | |
2903 | ||
2904 | /* Blocking call, waiting for transmission */ | |
2905 | ctx->consumer_metadata_socket = lttcomm_accept_unix_sock(client_socket); | |
2906 | if (ctx->consumer_metadata_socket < 0) { | |
2907 | WARN("On accept metadata"); | |
2908 | ret = -1; | |
2909 | goto error; | |
2910 | } | |
2911 | ret = 0; | |
2912 | ||
2913 | error: | |
2914 | return ret; | |
2915 | } | |
2916 | ||
3bd1e081 MD |
2917 | /* |
2918 | * This thread listens on the consumerd socket and receives the file | |
2919 | * descriptors from the session daemon. | |
2920 | */ | |
7d980def | 2921 | void *consumer_thread_sessiond_poll(void *data) |
3bd1e081 | 2922 | { |
d96f09c6 | 2923 | int sock = -1, client_socket, ret; |
3bd1e081 MD |
2924 | /* |
2925 | * structure to poll for incoming data on communication socket avoids | |
2926 | * making blocking sockets. | |
2927 | */ | |
2928 | struct pollfd consumer_sockpoll[2]; | |
2929 | struct lttng_consumer_local_data *ctx = data; | |
2930 | ||
e7b994a3 DG |
2931 | rcu_register_thread(); |
2932 | ||
3bd1e081 MD |
2933 | DBG("Creating command socket %s", ctx->consumer_command_sock_path); |
2934 | unlink(ctx->consumer_command_sock_path); | |
2935 | client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path); | |
2936 | if (client_socket < 0) { | |
2937 | ERR("Cannot create command socket"); | |
2938 | goto end; | |
2939 | } | |
2940 | ||
2941 | ret = lttcomm_listen_unix_sock(client_socket); | |
2942 | if (ret < 0) { | |
2943 | goto end; | |
2944 | } | |
2945 | ||
32258573 | 2946 | DBG("Sending ready command to lttng-sessiond"); |
f73fabfd | 2947 | ret = lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_COMMAND_SOCK_READY); |
3bd1e081 MD |
2948 | /* return < 0 on error, but == 0 is not fatal */ |
2949 | if (ret < 0) { | |
32258573 | 2950 | ERR("Error sending ready command to lttng-sessiond"); |
3bd1e081 MD |
2951 | goto end; |
2952 | } | |
2953 | ||
3bd1e081 MD |
2954 | /* prepare the FDs to poll : to client socket and the should_quit pipe */ |
2955 | consumer_sockpoll[0].fd = ctx->consumer_should_quit[0]; | |
2956 | consumer_sockpoll[0].events = POLLIN | POLLPRI; | |
2957 | consumer_sockpoll[1].fd = client_socket; | |
2958 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
2959 | ||
2960 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2961 | goto end; | |
2962 | } | |
2963 | DBG("Connection on client_socket"); | |
2964 | ||
2965 | /* Blocking call, waiting for transmission */ | |
2966 | sock = lttcomm_accept_unix_sock(client_socket); | |
534d2592 | 2967 | if (sock < 0) { |
3bd1e081 MD |
2968 | WARN("On accept"); |
2969 | goto end; | |
2970 | } | |
3bd1e081 | 2971 | |
331744e3 JD |
2972 | /* |
2973 | * Setup metadata socket which is the second socket connection on the | |
2974 | * command unix socket. | |
2975 | */ | |
2976 | ret = set_metadata_socket(ctx, consumer_sockpoll, client_socket); | |
2977 | if (ret < 0) { | |
2978 | goto end; | |
2979 | } | |
2980 | ||
d96f09c6 DG |
2981 | /* This socket is not useful anymore. */ |
2982 | ret = close(client_socket); | |
2983 | if (ret < 0) { | |
2984 | PERROR("close client_socket"); | |
2985 | } | |
2986 | client_socket = -1; | |
2987 | ||
3bd1e081 MD |
2988 | /* update the polling structure to poll on the established socket */ |
2989 | consumer_sockpoll[1].fd = sock; | |
2990 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
2991 | ||
2992 | while (1) { | |
2993 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2994 | goto end; | |
2995 | } | |
2996 | DBG("Incoming command on sock"); | |
2997 | ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
2998 | if (ret == -ENOENT) { | |
2999 | DBG("Received STOP command"); | |
3000 | goto end; | |
3001 | } | |
4cbc1a04 DG |
3002 | if (ret <= 0) { |
3003 | /* | |
3004 | * This could simply be a session daemon quitting. Don't output | |
3005 | * ERR() here. | |
3006 | */ | |
3007 | DBG("Communication interrupted on command socket"); | |
3bd1e081 MD |
3008 | goto end; |
3009 | } | |
3010 | if (consumer_quit) { | |
3011 | DBG("consumer_thread_receive_fds received quit from signal"); | |
3012 | goto end; | |
3013 | } | |
ffe60014 | 3014 | DBG("received command on sock"); |
3bd1e081 MD |
3015 | } |
3016 | end: | |
ffe60014 | 3017 | DBG("Consumer thread sessiond poll exiting"); |
3bd1e081 | 3018 | |
d88aee68 DG |
3019 | /* |
3020 | * Close metadata streams since the producer is the session daemon which | |
3021 | * just died. | |
3022 | * | |
3023 | * NOTE: for now, this only applies to the UST tracer. | |
3024 | */ | |
3025 | lttng_consumer_close_metadata(); | |
3026 | ||
3bd1e081 MD |
3027 | /* |
3028 | * when all fds have hung up, the polling thread | |
3029 | * can exit cleanly | |
3030 | */ | |
3031 | consumer_quit = 1; | |
3032 | ||
04fdd819 | 3033 | /* |
c869f647 | 3034 | * Notify the data poll thread to poll back again and test the |
8994307f | 3035 | * consumer_quit state that we just set so to quit gracefully. |
04fdd819 | 3036 | */ |
acdb9057 | 3037 | notify_thread_lttng_pipe(ctx->consumer_data_pipe); |
c869f647 | 3038 | |
a0cbdd2e | 3039 | notify_channel_pipe(ctx, NULL, -1, CONSUMER_CHANNEL_QUIT); |
d8ef542d | 3040 | |
d96f09c6 DG |
3041 | /* Cleaning up possibly open sockets. */ |
3042 | if (sock >= 0) { | |
3043 | ret = close(sock); | |
3044 | if (ret < 0) { | |
3045 | PERROR("close sock sessiond poll"); | |
3046 | } | |
3047 | } | |
3048 | if (client_socket >= 0) { | |
38476d24 | 3049 | ret = close(client_socket); |
d96f09c6 DG |
3050 | if (ret < 0) { |
3051 | PERROR("close client_socket sessiond poll"); | |
3052 | } | |
3053 | } | |
3054 | ||
e7b994a3 | 3055 | rcu_unregister_thread(); |
3bd1e081 MD |
3056 | return NULL; |
3057 | } | |
d41f73b7 | 3058 | |
4078b776 | 3059 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
3060 | struct lttng_consumer_local_data *ctx) |
3061 | { | |
74251bb8 DG |
3062 | ssize_t ret; |
3063 | ||
3064 | pthread_mutex_lock(&stream->lock); | |
3065 | ||
d41f73b7 MD |
3066 | switch (consumer_data.type) { |
3067 | case LTTNG_CONSUMER_KERNEL: | |
74251bb8 DG |
3068 | ret = lttng_kconsumer_read_subbuffer(stream, ctx); |
3069 | break; | |
7753dea8 MD |
3070 | case LTTNG_CONSUMER32_UST: |
3071 | case LTTNG_CONSUMER64_UST: | |
74251bb8 DG |
3072 | ret = lttng_ustconsumer_read_subbuffer(stream, ctx); |
3073 | break; | |
d41f73b7 MD |
3074 | default: |
3075 | ERR("Unknown consumer_data type"); | |
3076 | assert(0); | |
74251bb8 DG |
3077 | ret = -ENOSYS; |
3078 | break; | |
d41f73b7 | 3079 | } |
74251bb8 DG |
3080 | |
3081 | pthread_mutex_unlock(&stream->lock); | |
3082 | return ret; | |
d41f73b7 MD |
3083 | } |
3084 | ||
3085 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
3086 | { | |
3087 | switch (consumer_data.type) { | |
3088 | case LTTNG_CONSUMER_KERNEL: | |
3089 | return lttng_kconsumer_on_recv_stream(stream); | |
7753dea8 MD |
3090 | case LTTNG_CONSUMER32_UST: |
3091 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
3092 | return lttng_ustconsumer_on_recv_stream(stream); |
3093 | default: | |
3094 | ERR("Unknown consumer_data type"); | |
3095 | assert(0); | |
3096 | return -ENOSYS; | |
3097 | } | |
3098 | } | |
e4421fec DG |
3099 | |
3100 | /* | |
3101 | * Allocate and set consumer data hash tables. | |
3102 | */ | |
3103 | void lttng_consumer_init(void) | |
3104 | { | |
d88aee68 DG |
3105 | consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
3106 | consumer_data.relayd_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); | |
3107 | consumer_data.stream_list_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); | |
d8ef542d | 3108 | consumer_data.stream_per_chan_id_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
e4421fec | 3109 | } |
7735ef9e DG |
3110 | |
3111 | /* | |
3112 | * Process the ADD_RELAYD command receive by a consumer. | |
3113 | * | |
3114 | * This will create a relayd socket pair and add it to the relayd hash table. | |
3115 | * The caller MUST acquire a RCU read side lock before calling it. | |
3116 | */ | |
da009f2c | 3117 | int consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type, |
7735ef9e | 3118 | struct lttng_consumer_local_data *ctx, int sock, |
6151a90f | 3119 | struct pollfd *consumer_sockpoll, |
d3e2ba59 JD |
3120 | struct lttcomm_relayd_sock *relayd_sock, uint64_t sessiond_id, |
3121 | uint64_t relayd_session_id) | |
7735ef9e | 3122 | { |
cd2b09ed | 3123 | int fd = -1, ret = -1, relayd_created = 0; |
f50f23d9 | 3124 | enum lttng_error_code ret_code = LTTNG_OK; |
d4298c99 | 3125 | struct consumer_relayd_sock_pair *relayd = NULL; |
7735ef9e | 3126 | |
6151a90f JD |
3127 | assert(ctx); |
3128 | assert(relayd_sock); | |
3129 | ||
da009f2c | 3130 | DBG("Consumer adding relayd socket (idx: %" PRIu64 ")", net_seq_idx); |
7735ef9e DG |
3131 | |
3132 | /* Get relayd reference if exists. */ | |
3133 | relayd = consumer_find_relayd(net_seq_idx); | |
3134 | if (relayd == NULL) { | |
da009f2c | 3135 | assert(sock_type == LTTNG_STREAM_CONTROL); |
7735ef9e DG |
3136 | /* Not found. Allocate one. */ |
3137 | relayd = consumer_allocate_relayd_sock_pair(net_seq_idx); | |
3138 | if (relayd == NULL) { | |
0d08d75e | 3139 | ret = -ENOMEM; |
618a6a28 MD |
3140 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; |
3141 | goto error; | |
0d08d75e | 3142 | } else { |
30319bcb | 3143 | relayd->sessiond_session_id = sessiond_id; |
0d08d75e | 3144 | relayd_created = 1; |
7735ef9e | 3145 | } |
0d08d75e DG |
3146 | |
3147 | /* | |
3148 | * This code path MUST continue to the consumer send status message to | |
3149 | * we can notify the session daemon and continue our work without | |
3150 | * killing everything. | |
3151 | */ | |
da009f2c MD |
3152 | } else { |
3153 | /* | |
3154 | * relayd key should never be found for control socket. | |
3155 | */ | |
3156 | assert(sock_type != LTTNG_STREAM_CONTROL); | |
0d08d75e DG |
3157 | } |
3158 | ||
3159 | /* First send a status message before receiving the fds. */ | |
618a6a28 MD |
3160 | ret = consumer_send_status_msg(sock, LTTNG_OK); |
3161 | if (ret < 0) { | |
0d08d75e | 3162 | /* Somehow, the session daemon is not responding anymore. */ |
618a6a28 MD |
3163 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL); |
3164 | goto error_nosignal; | |
7735ef9e DG |
3165 | } |
3166 | ||
3167 | /* Poll on consumer socket. */ | |
3168 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
0d08d75e | 3169 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
7735ef9e | 3170 | ret = -EINTR; |
618a6a28 | 3171 | goto error_nosignal; |
7735ef9e DG |
3172 | } |
3173 | ||
3174 | /* Get relayd socket from session daemon */ | |
3175 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); | |
3176 | if (ret != sizeof(fd)) { | |
7735ef9e | 3177 | ret = -1; |
4028eeb9 | 3178 | fd = -1; /* Just in case it gets set with an invalid value. */ |
0d08d75e DG |
3179 | |
3180 | /* | |
3181 | * Failing to receive FDs might indicate a major problem such as | |
3182 | * reaching a fd limit during the receive where the kernel returns a | |
3183 | * MSG_CTRUNC and fails to cleanup the fd in the queue. Any case, we | |
3184 | * don't take any chances and stop everything. | |
3185 | * | |
3186 | * XXX: Feature request #558 will fix that and avoid this possible | |
3187 | * issue when reaching the fd limit. | |
3188 | */ | |
3189 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); | |
618a6a28 | 3190 | ret_code = LTTCOMM_CONSUMERD_ERROR_RECV_FD; |
f50f23d9 DG |
3191 | goto error; |
3192 | } | |
3193 | ||
7735ef9e DG |
3194 | /* Copy socket information and received FD */ |
3195 | switch (sock_type) { | |
3196 | case LTTNG_STREAM_CONTROL: | |
3197 | /* Copy received lttcomm socket */ | |
6151a90f JD |
3198 | lttcomm_copy_sock(&relayd->control_sock.sock, &relayd_sock->sock); |
3199 | ret = lttcomm_create_sock(&relayd->control_sock.sock); | |
4028eeb9 | 3200 | /* Handle create_sock error. */ |
f66c074c | 3201 | if (ret < 0) { |
618a6a28 | 3202 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; |
4028eeb9 | 3203 | goto error; |
f66c074c | 3204 | } |
da009f2c MD |
3205 | /* |
3206 | * Close the socket created internally by | |
3207 | * lttcomm_create_sock, so we can replace it by the one | |
3208 | * received from sessiond. | |
3209 | */ | |
3210 | if (close(relayd->control_sock.sock.fd)) { | |
3211 | PERROR("close"); | |
3212 | } | |
7735ef9e DG |
3213 | |
3214 | /* Assign new file descriptor */ | |
6151a90f | 3215 | relayd->control_sock.sock.fd = fd; |
4b29f1ce | 3216 | fd = -1; /* For error path */ |
6151a90f JD |
3217 | /* Assign version values. */ |
3218 | relayd->control_sock.major = relayd_sock->major; | |
3219 | relayd->control_sock.minor = relayd_sock->minor; | |
c5b6f4f0 | 3220 | |
d3e2ba59 | 3221 | relayd->relayd_session_id = relayd_session_id; |
c5b6f4f0 | 3222 | |
7735ef9e DG |
3223 | break; |
3224 | case LTTNG_STREAM_DATA: | |
3225 | /* Copy received lttcomm socket */ | |
6151a90f JD |
3226 | lttcomm_copy_sock(&relayd->data_sock.sock, &relayd_sock->sock); |
3227 | ret = lttcomm_create_sock(&relayd->data_sock.sock); | |
4028eeb9 | 3228 | /* Handle create_sock error. */ |
f66c074c | 3229 | if (ret < 0) { |
618a6a28 | 3230 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; |
4028eeb9 | 3231 | goto error; |
f66c074c | 3232 | } |
da009f2c MD |
3233 | /* |
3234 | * Close the socket created internally by | |
3235 | * lttcomm_create_sock, so we can replace it by the one | |
3236 | * received from sessiond. | |
3237 | */ | |
3238 | if (close(relayd->data_sock.sock.fd)) { | |
3239 | PERROR("close"); | |
3240 | } | |
7735ef9e DG |
3241 | |
3242 | /* Assign new file descriptor */ | |
6151a90f | 3243 | relayd->data_sock.sock.fd = fd; |
4b29f1ce | 3244 | fd = -1; /* for eventual error paths */ |
6151a90f JD |
3245 | /* Assign version values. */ |
3246 | relayd->data_sock.major = relayd_sock->major; | |
3247 | relayd->data_sock.minor = relayd_sock->minor; | |
7735ef9e DG |
3248 | break; |
3249 | default: | |
3250 | ERR("Unknown relayd socket type (%d)", sock_type); | |
59e71485 | 3251 | ret = -1; |
618a6a28 | 3252 | ret_code = LTTCOMM_CONSUMERD_FATAL; |
7735ef9e DG |
3253 | goto error; |
3254 | } | |
3255 | ||
d88aee68 | 3256 | DBG("Consumer %s socket created successfully with net idx %" PRIu64 " (fd: %d)", |
7735ef9e DG |
3257 | sock_type == LTTNG_STREAM_CONTROL ? "control" : "data", |
3258 | relayd->net_seq_idx, fd); | |
3259 | ||
618a6a28 MD |
3260 | /* We successfully added the socket. Send status back. */ |
3261 | ret = consumer_send_status_msg(sock, ret_code); | |
3262 | if (ret < 0) { | |
3263 | /* Somehow, the session daemon is not responding anymore. */ | |
3264 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL); | |
3265 | goto error_nosignal; | |
3266 | } | |
3267 | ||
7735ef9e DG |
3268 | /* |
3269 | * Add relayd socket pair to consumer data hashtable. If object already | |
3270 | * exists or on error, the function gracefully returns. | |
3271 | */ | |
d09e1200 | 3272 | add_relayd(relayd); |
7735ef9e DG |
3273 | |
3274 | /* All good! */ | |
4028eeb9 | 3275 | return 0; |
7735ef9e DG |
3276 | |
3277 | error: | |
618a6a28 MD |
3278 | if (consumer_send_status_msg(sock, ret_code) < 0) { |
3279 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL); | |
3280 | } | |
3281 | ||
3282 | error_nosignal: | |
4028eeb9 DG |
3283 | /* Close received socket if valid. */ |
3284 | if (fd >= 0) { | |
3285 | if (close(fd)) { | |
3286 | PERROR("close received socket"); | |
3287 | } | |
3288 | } | |
cd2b09ed DG |
3289 | |
3290 | if (relayd_created) { | |
cd2b09ed DG |
3291 | free(relayd); |
3292 | } | |
3293 | ||
7735ef9e DG |
3294 | return ret; |
3295 | } | |
ca22feea | 3296 | |
4e9a4686 DG |
3297 | /* |
3298 | * Try to lock the stream mutex. | |
3299 | * | |
3300 | * On success, 1 is returned else 0 indicating that the mutex is NOT lock. | |
3301 | */ | |
3302 | static int stream_try_lock(struct lttng_consumer_stream *stream) | |
3303 | { | |
3304 | int ret; | |
3305 | ||
3306 | assert(stream); | |
3307 | ||
3308 | /* | |
3309 | * Try to lock the stream mutex. On failure, we know that the stream is | |
3310 | * being used else where hence there is data still being extracted. | |
3311 | */ | |
3312 | ret = pthread_mutex_trylock(&stream->lock); | |
3313 | if (ret) { | |
3314 | /* For both EBUSY and EINVAL error, the mutex is NOT locked. */ | |
3315 | ret = 0; | |
3316 | goto end; | |
3317 | } | |
3318 | ||
3319 | ret = 1; | |
3320 | ||
3321 | end: | |
3322 | return ret; | |
3323 | } | |
3324 | ||
f7079f67 DG |
3325 | /* |
3326 | * Search for a relayd associated to the session id and return the reference. | |
3327 | * | |
3328 | * A rcu read side lock MUST be acquire before calling this function and locked | |
3329 | * until the relayd object is no longer necessary. | |
3330 | */ | |
3331 | static struct consumer_relayd_sock_pair *find_relayd_by_session_id(uint64_t id) | |
3332 | { | |
3333 | struct lttng_ht_iter iter; | |
f7079f67 | 3334 | struct consumer_relayd_sock_pair *relayd = NULL; |
f7079f67 DG |
3335 | |
3336 | /* Iterate over all relayd since they are indexed by net_seq_idx. */ | |
3337 | cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd, | |
3338 | node.node) { | |
18261bd1 DG |
3339 | /* |
3340 | * Check by sessiond id which is unique here where the relayd session | |
3341 | * id might not be when having multiple relayd. | |
3342 | */ | |
3343 | if (relayd->sessiond_session_id == id) { | |
f7079f67 | 3344 | /* Found the relayd. There can be only one per id. */ |
18261bd1 | 3345 | goto found; |
f7079f67 DG |
3346 | } |
3347 | } | |
3348 | ||
18261bd1 DG |
3349 | return NULL; |
3350 | ||
3351 | found: | |
f7079f67 DG |
3352 | return relayd; |
3353 | } | |
3354 | ||
ca22feea DG |
3355 | /* |
3356 | * Check if for a given session id there is still data needed to be extract | |
3357 | * from the buffers. | |
3358 | * | |
6d805429 | 3359 | * Return 1 if data is pending or else 0 meaning ready to be read. |
ca22feea | 3360 | */ |
6d805429 | 3361 | int consumer_data_pending(uint64_t id) |
ca22feea DG |
3362 | { |
3363 | int ret; | |
3364 | struct lttng_ht_iter iter; | |
3365 | struct lttng_ht *ht; | |
3366 | struct lttng_consumer_stream *stream; | |
f7079f67 | 3367 | struct consumer_relayd_sock_pair *relayd = NULL; |
6d805429 | 3368 | int (*data_pending)(struct lttng_consumer_stream *); |
ca22feea | 3369 | |
6d805429 | 3370 | DBG("Consumer data pending command on session id %" PRIu64, id); |
ca22feea | 3371 | |
6f6eda74 | 3372 | rcu_read_lock(); |
ca22feea DG |
3373 | pthread_mutex_lock(&consumer_data.lock); |
3374 | ||
3375 | switch (consumer_data.type) { | |
3376 | case LTTNG_CONSUMER_KERNEL: | |
6d805429 | 3377 | data_pending = lttng_kconsumer_data_pending; |
ca22feea DG |
3378 | break; |
3379 | case LTTNG_CONSUMER32_UST: | |
3380 | case LTTNG_CONSUMER64_UST: | |
6d805429 | 3381 | data_pending = lttng_ustconsumer_data_pending; |
ca22feea DG |
3382 | break; |
3383 | default: | |
3384 | ERR("Unknown consumer data type"); | |
3385 | assert(0); | |
3386 | } | |
3387 | ||
3388 | /* Ease our life a bit */ | |
3389 | ht = consumer_data.stream_list_ht; | |
3390 | ||
f7079f67 DG |
3391 | relayd = find_relayd_by_session_id(id); |
3392 | if (relayd) { | |
3393 | /* Send init command for data pending. */ | |
3394 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
3395 | ret = relayd_begin_data_pending(&relayd->control_sock, | |
3396 | relayd->relayd_session_id); | |
3397 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
3398 | if (ret < 0) { | |
3399 | /* Communication error thus the relayd so no data pending. */ | |
3400 | goto data_not_pending; | |
3401 | } | |
3402 | } | |
3403 | ||
c8f59ee5 | 3404 | cds_lfht_for_each_entry_duplicate(ht->ht, |
d88aee68 DG |
3405 | ht->hash_fct(&id, lttng_ht_seed), |
3406 | ht->match_fct, &id, | |
ca22feea | 3407 | &iter.iter, stream, node_session_id.node) { |
4e9a4686 DG |
3408 | /* If this call fails, the stream is being used hence data pending. */ |
3409 | ret = stream_try_lock(stream); | |
3410 | if (!ret) { | |
f7079f67 | 3411 | goto data_pending; |
ca22feea | 3412 | } |
ca22feea | 3413 | |
4e9a4686 DG |
3414 | /* |
3415 | * A removed node from the hash table indicates that the stream has | |
3416 | * been deleted thus having a guarantee that the buffers are closed | |
3417 | * on the consumer side. However, data can still be transmitted | |
3418 | * over the network so don't skip the relayd check. | |
3419 | */ | |
3420 | ret = cds_lfht_is_node_deleted(&stream->node.node); | |
3421 | if (!ret) { | |
e5d1a9b3 MD |
3422 | /* |
3423 | * An empty output file is not valid. We need at least one packet | |
3424 | * generated per stream, even if it contains no event, so it | |
3425 | * contains at least one packet header. | |
3426 | */ | |
3427 | if (stream->output_written == 0) { | |
3428 | pthread_mutex_unlock(&stream->lock); | |
3429 | goto data_pending; | |
3430 | } | |
4e9a4686 | 3431 | /* Check the stream if there is data in the buffers. */ |
6d805429 DG |
3432 | ret = data_pending(stream); |
3433 | if (ret == 1) { | |
4e9a4686 | 3434 | pthread_mutex_unlock(&stream->lock); |
f7079f67 | 3435 | goto data_pending; |
4e9a4686 DG |
3436 | } |
3437 | } | |
3438 | ||
3439 | /* Relayd check */ | |
f7079f67 | 3440 | if (relayd) { |
c8f59ee5 DG |
3441 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); |
3442 | if (stream->metadata_flag) { | |
ad7051c0 DG |
3443 | ret = relayd_quiescent_control(&relayd->control_sock, |
3444 | stream->relayd_stream_id); | |
c8f59ee5 | 3445 | } else { |
6d805429 | 3446 | ret = relayd_data_pending(&relayd->control_sock, |
39df6d9f DG |
3447 | stream->relayd_stream_id, |
3448 | stream->next_net_seq_num - 1); | |
c8f59ee5 DG |
3449 | } |
3450 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
6d805429 | 3451 | if (ret == 1) { |
4e9a4686 | 3452 | pthread_mutex_unlock(&stream->lock); |
f7079f67 | 3453 | goto data_pending; |
c8f59ee5 DG |
3454 | } |
3455 | } | |
4e9a4686 | 3456 | pthread_mutex_unlock(&stream->lock); |
c8f59ee5 | 3457 | } |
ca22feea | 3458 | |
f7079f67 DG |
3459 | if (relayd) { |
3460 | unsigned int is_data_inflight = 0; | |
3461 | ||
3462 | /* Send init command for data pending. */ | |
3463 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
3464 | ret = relayd_end_data_pending(&relayd->control_sock, | |
3465 | relayd->relayd_session_id, &is_data_inflight); | |
3466 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
bdd88757 | 3467 | if (ret < 0) { |
f7079f67 DG |
3468 | goto data_not_pending; |
3469 | } | |
bdd88757 DG |
3470 | if (is_data_inflight) { |
3471 | goto data_pending; | |
3472 | } | |
f7079f67 DG |
3473 | } |
3474 | ||
ca22feea | 3475 | /* |
f7079f67 DG |
3476 | * Finding _no_ node in the hash table and no inflight data means that the |
3477 | * stream(s) have been removed thus data is guaranteed to be available for | |
3478 | * analysis from the trace files. | |
ca22feea DG |
3479 | */ |
3480 | ||
f7079f67 | 3481 | data_not_pending: |
ca22feea DG |
3482 | /* Data is available to be read by a viewer. */ |
3483 | pthread_mutex_unlock(&consumer_data.lock); | |
c8f59ee5 | 3484 | rcu_read_unlock(); |
6d805429 | 3485 | return 0; |
ca22feea | 3486 | |
f7079f67 | 3487 | data_pending: |
ca22feea DG |
3488 | /* Data is still being extracted from buffers. */ |
3489 | pthread_mutex_unlock(&consumer_data.lock); | |
c8f59ee5 | 3490 | rcu_read_unlock(); |
6d805429 | 3491 | return 1; |
ca22feea | 3492 | } |
f50f23d9 DG |
3493 | |
3494 | /* | |
3495 | * Send a ret code status message to the sessiond daemon. | |
3496 | * | |
3497 | * Return the sendmsg() return value. | |
3498 | */ | |
3499 | int consumer_send_status_msg(int sock, int ret_code) | |
3500 | { | |
3501 | struct lttcomm_consumer_status_msg msg; | |
3502 | ||
3503 | msg.ret_code = ret_code; | |
3504 | ||
3505 | return lttcomm_send_unix_sock(sock, &msg, sizeof(msg)); | |
3506 | } | |
ffe60014 DG |
3507 | |
3508 | /* | |
3509 | * Send a channel status message to the sessiond daemon. | |
3510 | * | |
3511 | * Return the sendmsg() return value. | |
3512 | */ | |
3513 | int consumer_send_status_channel(int sock, | |
3514 | struct lttng_consumer_channel *channel) | |
3515 | { | |
3516 | struct lttcomm_consumer_status_channel msg; | |
3517 | ||
3518 | assert(sock >= 0); | |
3519 | ||
3520 | if (!channel) { | |
3521 | msg.ret_code = -LTTNG_ERR_UST_CHAN_FAIL; | |
3522 | } else { | |
3523 | msg.ret_code = LTTNG_OK; | |
3524 | msg.key = channel->key; | |
3525 | msg.stream_count = channel->streams.count; | |
3526 | } | |
3527 | ||
3528 | return lttcomm_send_unix_sock(sock, &msg, sizeof(msg)); | |
3529 | } | |
5c786ded JD |
3530 | |
3531 | /* | |
3532 | * Using a maximum stream size with the produced and consumed position of a | |
3533 | * stream, computes the new consumed position to be as close as possible to the | |
3534 | * maximum possible stream size. | |
3535 | * | |
3536 | * If maximum stream size is lower than the possible buffer size (produced - | |
3537 | * consumed), the consumed_pos given is returned untouched else the new value | |
3538 | * is returned. | |
3539 | */ | |
3540 | unsigned long consumer_get_consumed_maxsize(unsigned long consumed_pos, | |
3541 | unsigned long produced_pos, uint64_t max_stream_size) | |
3542 | { | |
3543 | if (max_stream_size && max_stream_size < (produced_pos - consumed_pos)) { | |
3544 | /* Offset from the produced position to get the latest buffers. */ | |
3545 | return produced_pos - max_stream_size; | |
3546 | } | |
3547 | ||
3548 | return consumed_pos; | |
3549 | } |