Commit | Line | Data |
---|---|---|
3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
00e2e675 | 4 | * 2012 - David Goulet <dgoulet@efficios.com> |
3bd1e081 | 5 | * |
d14d33bf AM |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License, version 2 only, | |
8 | * as published by the Free Software Foundation. | |
3bd1e081 | 9 | * |
d14d33bf AM |
10 | * This program is distributed in the hope that it will be useful, but WITHOUT |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
3bd1e081 | 14 | * |
d14d33bf AM |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
3bd1e081 MD |
18 | */ |
19 | ||
20 | #define _GNU_SOURCE | |
21 | #include <assert.h> | |
3bd1e081 MD |
22 | #include <poll.h> |
23 | #include <pthread.h> | |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | #include <sys/mman.h> | |
27 | #include <sys/socket.h> | |
28 | #include <sys/types.h> | |
29 | #include <unistd.h> | |
77c7c900 | 30 | #include <inttypes.h> |
3bd1e081 | 31 | |
990570ed | 32 | #include <common/common.h> |
fb3a43a9 DG |
33 | #include <common/utils.h> |
34 | #include <common/compat/poll.h> | |
10a8a223 | 35 | #include <common/kernel-ctl/kernel-ctl.h> |
00e2e675 | 36 | #include <common/sessiond-comm/relayd.h> |
10a8a223 DG |
37 | #include <common/sessiond-comm/sessiond-comm.h> |
38 | #include <common/kernel-consumer/kernel-consumer.h> | |
00e2e675 | 39 | #include <common/relayd/relayd.h> |
10a8a223 DG |
40 | #include <common/ust-consumer/ust-consumer.h> |
41 | ||
42 | #include "consumer.h" | |
3bd1e081 MD |
43 | |
44 | struct lttng_consumer_global_data consumer_data = { | |
3bd1e081 MD |
45 | .stream_count = 0, |
46 | .need_update = 1, | |
47 | .type = LTTNG_CONSUMER_UNKNOWN, | |
48 | }; | |
49 | ||
50 | /* timeout parameter, to control the polling thread grace period. */ | |
51 | int consumer_poll_timeout = -1; | |
52 | ||
53 | /* | |
54 | * Flag to inform the polling thread to quit when all fd hung up. Updated by | |
55 | * the consumer_thread_receive_fds when it notices that all fds has hung up. | |
56 | * Also updated by the signal handler (consumer_should_exit()). Read by the | |
57 | * polling threads. | |
58 | */ | |
a98dae5f | 59 | volatile int consumer_quit; |
3bd1e081 | 60 | |
43c34bc3 DG |
61 | /* |
62 | * The following two hash tables are visible by all threads which are separated | |
63 | * in different source files. | |
64 | * | |
65 | * Global hash table containing respectively metadata and data streams. The | |
66 | * stream element in this ht should only be updated by the metadata poll thread | |
67 | * for the metadata and the data poll thread for the data. | |
68 | */ | |
a98dae5f DG |
69 | struct lttng_ht *metadata_ht; |
70 | struct lttng_ht *data_ht; | |
43c34bc3 | 71 | |
8994307f DG |
72 | /* |
73 | * Notify a thread pipe to poll back again. This usually means that some global | |
74 | * state has changed so we just send back the thread in a poll wait call. | |
75 | */ | |
76 | static void notify_thread_pipe(int wpipe) | |
77 | { | |
78 | int ret; | |
79 | ||
80 | do { | |
81 | struct lttng_consumer_stream *null_stream = NULL; | |
82 | ||
83 | ret = write(wpipe, &null_stream, sizeof(null_stream)); | |
84 | } while (ret < 0 && errno == EINTR); | |
85 | } | |
86 | ||
3bd1e081 MD |
87 | /* |
88 | * Find a stream. The consumer_data.lock must be locked during this | |
89 | * call. | |
90 | */ | |
8389e4f8 DG |
91 | static struct lttng_consumer_stream *consumer_find_stream(int key, |
92 | struct lttng_ht *ht) | |
3bd1e081 | 93 | { |
e4421fec DG |
94 | struct lttng_ht_iter iter; |
95 | struct lttng_ht_node_ulong *node; | |
96 | struct lttng_consumer_stream *stream = NULL; | |
3bd1e081 | 97 | |
8389e4f8 DG |
98 | assert(ht); |
99 | ||
7ad0a0cb | 100 | /* Negative keys are lookup failures */ |
7a57cf92 | 101 | if (key < 0) { |
7ad0a0cb | 102 | return NULL; |
7a57cf92 | 103 | } |
e4421fec | 104 | |
6065ceec DG |
105 | rcu_read_lock(); |
106 | ||
8389e4f8 | 107 | lttng_ht_lookup(ht, (void *)((unsigned long) key), &iter); |
e4421fec DG |
108 | node = lttng_ht_iter_get_node_ulong(&iter); |
109 | if (node != NULL) { | |
110 | stream = caa_container_of(node, struct lttng_consumer_stream, node); | |
3bd1e081 | 111 | } |
e4421fec | 112 | |
6065ceec DG |
113 | rcu_read_unlock(); |
114 | ||
e4421fec | 115 | return stream; |
3bd1e081 MD |
116 | } |
117 | ||
c869f647 | 118 | void consumer_steal_stream_key(int key, struct lttng_ht *ht) |
7ad0a0cb MD |
119 | { |
120 | struct lttng_consumer_stream *stream; | |
121 | ||
04253271 | 122 | rcu_read_lock(); |
8389e4f8 | 123 | stream = consumer_find_stream(key, ht); |
04253271 | 124 | if (stream) { |
7ad0a0cb | 125 | stream->key = -1; |
04253271 MD |
126 | /* |
127 | * We don't want the lookup to match, but we still need | |
128 | * to iterate on this stream when iterating over the hash table. Just | |
129 | * change the node key. | |
130 | */ | |
131 | stream->node.key = -1; | |
132 | } | |
133 | rcu_read_unlock(); | |
7ad0a0cb MD |
134 | } |
135 | ||
3bd1e081 MD |
136 | static struct lttng_consumer_channel *consumer_find_channel(int key) |
137 | { | |
e4421fec DG |
138 | struct lttng_ht_iter iter; |
139 | struct lttng_ht_node_ulong *node; | |
140 | struct lttng_consumer_channel *channel = NULL; | |
3bd1e081 | 141 | |
7ad0a0cb | 142 | /* Negative keys are lookup failures */ |
7a57cf92 | 143 | if (key < 0) { |
7ad0a0cb | 144 | return NULL; |
7a57cf92 | 145 | } |
e4421fec | 146 | |
6065ceec DG |
147 | rcu_read_lock(); |
148 | ||
e4421fec DG |
149 | lttng_ht_lookup(consumer_data.channel_ht, (void *)((unsigned long) key), |
150 | &iter); | |
151 | node = lttng_ht_iter_get_node_ulong(&iter); | |
152 | if (node != NULL) { | |
153 | channel = caa_container_of(node, struct lttng_consumer_channel, node); | |
3bd1e081 | 154 | } |
e4421fec | 155 | |
6065ceec DG |
156 | rcu_read_unlock(); |
157 | ||
e4421fec | 158 | return channel; |
3bd1e081 MD |
159 | } |
160 | ||
7ad0a0cb MD |
161 | static void consumer_steal_channel_key(int key) |
162 | { | |
163 | struct lttng_consumer_channel *channel; | |
164 | ||
04253271 | 165 | rcu_read_lock(); |
7ad0a0cb | 166 | channel = consumer_find_channel(key); |
04253271 | 167 | if (channel) { |
7ad0a0cb | 168 | channel->key = -1; |
04253271 MD |
169 | /* |
170 | * We don't want the lookup to match, but we still need | |
171 | * to iterate on this channel when iterating over the hash table. Just | |
172 | * change the node key. | |
173 | */ | |
174 | channel->node.key = -1; | |
175 | } | |
176 | rcu_read_unlock(); | |
7ad0a0cb MD |
177 | } |
178 | ||
702b1ea4 MD |
179 | static |
180 | void consumer_free_stream(struct rcu_head *head) | |
181 | { | |
182 | struct lttng_ht_node_ulong *node = | |
183 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
184 | struct lttng_consumer_stream *stream = | |
185 | caa_container_of(node, struct lttng_consumer_stream, node); | |
186 | ||
187 | free(stream); | |
188 | } | |
189 | ||
00e2e675 DG |
190 | /* |
191 | * RCU protected relayd socket pair free. | |
192 | */ | |
193 | static void consumer_rcu_free_relayd(struct rcu_head *head) | |
194 | { | |
195 | struct lttng_ht_node_ulong *node = | |
196 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
197 | struct consumer_relayd_sock_pair *relayd = | |
198 | caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
199 | ||
8994307f DG |
200 | /* |
201 | * Close all sockets. This is done in the call RCU since we don't want the | |
202 | * socket fds to be reassigned thus potentially creating bad state of the | |
203 | * relayd object. | |
204 | * | |
205 | * We do not have to lock the control socket mutex here since at this stage | |
206 | * there is no one referencing to this relayd object. | |
207 | */ | |
208 | (void) relayd_close(&relayd->control_sock); | |
209 | (void) relayd_close(&relayd->data_sock); | |
210 | ||
00e2e675 DG |
211 | free(relayd); |
212 | } | |
213 | ||
214 | /* | |
215 | * Destroy and free relayd socket pair object. | |
216 | * | |
217 | * This function MUST be called with the consumer_data lock acquired. | |
218 | */ | |
d09e1200 | 219 | static void destroy_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
220 | { |
221 | int ret; | |
222 | struct lttng_ht_iter iter; | |
223 | ||
173af62f DG |
224 | if (relayd == NULL) { |
225 | return; | |
226 | } | |
227 | ||
00e2e675 DG |
228 | DBG("Consumer destroy and close relayd socket pair"); |
229 | ||
230 | iter.iter.node = &relayd->node.node; | |
231 | ret = lttng_ht_del(consumer_data.relayd_ht, &iter); | |
173af62f | 232 | if (ret != 0) { |
8994307f | 233 | /* We assume the relayd is being or is destroyed */ |
173af62f DG |
234 | return; |
235 | } | |
00e2e675 | 236 | |
00e2e675 DG |
237 | /* RCU free() call */ |
238 | call_rcu(&relayd->node.head, consumer_rcu_free_relayd); | |
239 | } | |
240 | ||
8994307f DG |
241 | /* |
242 | * Update the end point status of all streams having the given network sequence | |
243 | * index (relayd index). | |
244 | * | |
245 | * It's atomically set without having the stream mutex locked which is fine | |
246 | * because we handle the write/read race with a pipe wakeup for each thread. | |
247 | */ | |
248 | static void update_endpoint_status_by_netidx(int net_seq_idx, | |
249 | enum consumer_endpoint_status status) | |
250 | { | |
251 | struct lttng_ht_iter iter; | |
252 | struct lttng_consumer_stream *stream; | |
253 | ||
254 | DBG("Consumer set delete flag on stream by idx %d", net_seq_idx); | |
255 | ||
256 | rcu_read_lock(); | |
257 | ||
258 | /* Let's begin with metadata */ | |
259 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) { | |
260 | if (stream->net_seq_idx == net_seq_idx) { | |
261 | uatomic_set(&stream->endpoint_status, status); | |
262 | DBG("Delete flag set to metadata stream %d", stream->wait_fd); | |
263 | } | |
264 | } | |
265 | ||
266 | /* Follow up by the data streams */ | |
267 | cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) { | |
268 | if (stream->net_seq_idx == net_seq_idx) { | |
269 | uatomic_set(&stream->endpoint_status, status); | |
270 | DBG("Delete flag set to data stream %d", stream->wait_fd); | |
271 | } | |
272 | } | |
273 | rcu_read_unlock(); | |
274 | } | |
275 | ||
276 | /* | |
277 | * Cleanup a relayd object by flagging every associated streams for deletion, | |
278 | * destroying the object meaning removing it from the relayd hash table, | |
279 | * closing the sockets and freeing the memory in a RCU call. | |
280 | * | |
281 | * If a local data context is available, notify the threads that the streams' | |
282 | * state have changed. | |
283 | */ | |
284 | static void cleanup_relayd(struct consumer_relayd_sock_pair *relayd, | |
285 | struct lttng_consumer_local_data *ctx) | |
286 | { | |
287 | int netidx; | |
288 | ||
289 | assert(relayd); | |
290 | ||
291 | /* Save the net sequence index before destroying the object */ | |
292 | netidx = relayd->net_seq_idx; | |
293 | ||
294 | /* | |
295 | * Delete the relayd from the relayd hash table, close the sockets and free | |
296 | * the object in a RCU call. | |
297 | */ | |
298 | destroy_relayd(relayd); | |
299 | ||
300 | /* Set inactive endpoint to all streams */ | |
301 | update_endpoint_status_by_netidx(netidx, CONSUMER_ENDPOINT_INACTIVE); | |
302 | ||
303 | /* | |
304 | * With a local data context, notify the threads that the streams' state | |
305 | * have changed. The write() action on the pipe acts as an "implicit" | |
306 | * memory barrier ordering the updates of the end point status from the | |
307 | * read of this status which happens AFTER receiving this notify. | |
308 | */ | |
309 | if (ctx) { | |
310 | notify_thread_pipe(ctx->consumer_data_pipe[1]); | |
311 | notify_thread_pipe(ctx->consumer_metadata_pipe[1]); | |
312 | } | |
313 | } | |
314 | ||
a6ba4fe1 DG |
315 | /* |
316 | * Flag a relayd socket pair for destruction. Destroy it if the refcount | |
317 | * reaches zero. | |
318 | * | |
319 | * RCU read side lock MUST be aquired before calling this function. | |
320 | */ | |
321 | void consumer_flag_relayd_for_destroy(struct consumer_relayd_sock_pair *relayd) | |
322 | { | |
323 | assert(relayd); | |
324 | ||
325 | /* Set destroy flag for this object */ | |
326 | uatomic_set(&relayd->destroy_flag, 1); | |
327 | ||
328 | /* Destroy the relayd if refcount is 0 */ | |
329 | if (uatomic_read(&relayd->refcount) == 0) { | |
d09e1200 | 330 | destroy_relayd(relayd); |
a6ba4fe1 DG |
331 | } |
332 | } | |
333 | ||
3bd1e081 MD |
334 | /* |
335 | * Remove a stream from the global list protected by a mutex. This | |
336 | * function is also responsible for freeing its data structures. | |
337 | */ | |
e316aad5 DG |
338 | void consumer_del_stream(struct lttng_consumer_stream *stream, |
339 | struct lttng_ht *ht) | |
3bd1e081 MD |
340 | { |
341 | int ret; | |
e4421fec | 342 | struct lttng_ht_iter iter; |
3bd1e081 | 343 | struct lttng_consumer_channel *free_chan = NULL; |
00e2e675 DG |
344 | struct consumer_relayd_sock_pair *relayd; |
345 | ||
346 | assert(stream); | |
3bd1e081 | 347 | |
8994307f DG |
348 | DBG("Consumer del stream %d", stream->wait_fd); |
349 | ||
e316aad5 DG |
350 | if (ht == NULL) { |
351 | /* Means the stream was allocated but not successfully added */ | |
352 | goto free_stream; | |
353 | } | |
354 | ||
8994307f | 355 | pthread_mutex_lock(&stream->lock); |
3bd1e081 MD |
356 | pthread_mutex_lock(&consumer_data.lock); |
357 | ||
358 | switch (consumer_data.type) { | |
359 | case LTTNG_CONSUMER_KERNEL: | |
360 | if (stream->mmap_base != NULL) { | |
361 | ret = munmap(stream->mmap_base, stream->mmap_len); | |
362 | if (ret != 0) { | |
7a57cf92 | 363 | PERROR("munmap"); |
3bd1e081 MD |
364 | } |
365 | } | |
366 | break; | |
7753dea8 MD |
367 | case LTTNG_CONSUMER32_UST: |
368 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
369 | lttng_ustconsumer_del_stream(stream); |
370 | break; | |
371 | default: | |
372 | ERR("Unknown consumer_data type"); | |
373 | assert(0); | |
374 | goto end; | |
375 | } | |
376 | ||
6065ceec | 377 | rcu_read_lock(); |
04253271 | 378 | iter.iter.node = &stream->node.node; |
e316aad5 | 379 | ret = lttng_ht_del(ht, &iter); |
04253271 | 380 | assert(!ret); |
ca22feea DG |
381 | |
382 | /* Remove node session id from the consumer_data stream ht */ | |
383 | iter.iter.node = &stream->node_session_id.node; | |
384 | ret = lttng_ht_del(consumer_data.stream_list_ht, &iter); | |
385 | assert(!ret); | |
6065ceec DG |
386 | rcu_read_unlock(); |
387 | ||
50f8ae69 | 388 | assert(consumer_data.stream_count > 0); |
3bd1e081 | 389 | consumer_data.stream_count--; |
50f8ae69 | 390 | |
3bd1e081 | 391 | if (stream->out_fd >= 0) { |
4c462e79 MD |
392 | ret = close(stream->out_fd); |
393 | if (ret) { | |
394 | PERROR("close"); | |
395 | } | |
3bd1e081 | 396 | } |
b5c5fc29 | 397 | if (stream->wait_fd >= 0 && !stream->wait_fd_is_copy) { |
4c462e79 MD |
398 | ret = close(stream->wait_fd); |
399 | if (ret) { | |
400 | PERROR("close"); | |
401 | } | |
3bd1e081 | 402 | } |
2c1dd183 | 403 | if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) { |
4c462e79 MD |
404 | ret = close(stream->shm_fd); |
405 | if (ret) { | |
406 | PERROR("close"); | |
407 | } | |
3bd1e081 | 408 | } |
00e2e675 DG |
409 | |
410 | /* Check and cleanup relayd */ | |
b0b335c8 | 411 | rcu_read_lock(); |
00e2e675 DG |
412 | relayd = consumer_find_relayd(stream->net_seq_idx); |
413 | if (relayd != NULL) { | |
b0b335c8 MD |
414 | uatomic_dec(&relayd->refcount); |
415 | assert(uatomic_read(&relayd->refcount) >= 0); | |
173af62f | 416 | |
3f8e211f DG |
417 | /* Closing streams requires to lock the control socket. */ |
418 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
173af62f DG |
419 | ret = relayd_send_close_stream(&relayd->control_sock, |
420 | stream->relayd_stream_id, | |
421 | stream->next_net_seq_num - 1); | |
3f8e211f | 422 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); |
173af62f | 423 | if (ret < 0) { |
a4b92340 DG |
424 | DBG("Unable to close stream on the relayd. Continuing"); |
425 | /* | |
426 | * Continue here. There is nothing we can do for the relayd. | |
427 | * Chances are that the relayd has closed the socket so we just | |
428 | * continue cleaning up. | |
429 | */ | |
173af62f DG |
430 | } |
431 | ||
432 | /* Both conditions are met, we destroy the relayd. */ | |
433 | if (uatomic_read(&relayd->refcount) == 0 && | |
434 | uatomic_read(&relayd->destroy_flag)) { | |
d09e1200 | 435 | destroy_relayd(relayd); |
00e2e675 | 436 | } |
00e2e675 | 437 | } |
b0b335c8 | 438 | rcu_read_unlock(); |
00e2e675 | 439 | |
c30aaa51 MD |
440 | uatomic_dec(&stream->chan->refcount); |
441 | if (!uatomic_read(&stream->chan->refcount) | |
442 | && !uatomic_read(&stream->chan->nb_init_streams)) { | |
3bd1e081 | 443 | free_chan = stream->chan; |
00e2e675 DG |
444 | } |
445 | ||
3bd1e081 MD |
446 | end: |
447 | consumer_data.need_update = 1; | |
448 | pthread_mutex_unlock(&consumer_data.lock); | |
8994307f | 449 | pthread_mutex_unlock(&stream->lock); |
3bd1e081 | 450 | |
c30aaa51 | 451 | if (free_chan) { |
3bd1e081 | 452 | consumer_del_channel(free_chan); |
c30aaa51 | 453 | } |
e316aad5 DG |
454 | |
455 | free_stream: | |
456 | call_rcu(&stream->node.head, consumer_free_stream); | |
3bd1e081 MD |
457 | } |
458 | ||
459 | struct lttng_consumer_stream *consumer_allocate_stream( | |
460 | int channel_key, int stream_key, | |
461 | int shm_fd, int wait_fd, | |
462 | enum lttng_consumer_stream_state state, | |
463 | uint64_t mmap_len, | |
464 | enum lttng_event_output output, | |
6df2e2c9 MD |
465 | const char *path_name, |
466 | uid_t uid, | |
00e2e675 DG |
467 | gid_t gid, |
468 | int net_index, | |
c80048c6 | 469 | int metadata_flag, |
53632229 | 470 | uint64_t session_id, |
c80048c6 | 471 | int *alloc_ret) |
3bd1e081 MD |
472 | { |
473 | struct lttng_consumer_stream *stream; | |
3bd1e081 | 474 | |
effcf122 | 475 | stream = zmalloc(sizeof(*stream)); |
3bd1e081 | 476 | if (stream == NULL) { |
7a57cf92 | 477 | PERROR("malloc struct lttng_consumer_stream"); |
c80048c6 | 478 | *alloc_ret = -ENOMEM; |
7a57cf92 | 479 | goto end; |
3bd1e081 | 480 | } |
7a57cf92 DG |
481 | |
482 | /* | |
483 | * Get stream's channel reference. Needed when adding the stream to the | |
484 | * global hash table. | |
485 | */ | |
3bd1e081 MD |
486 | stream->chan = consumer_find_channel(channel_key); |
487 | if (!stream->chan) { | |
c80048c6 | 488 | *alloc_ret = -ENOENT; |
7a57cf92 | 489 | ERR("Unable to find channel for stream %d", stream_key); |
c80048c6 | 490 | goto error; |
3bd1e081 | 491 | } |
e316aad5 | 492 | |
3bd1e081 MD |
493 | stream->key = stream_key; |
494 | stream->shm_fd = shm_fd; | |
495 | stream->wait_fd = wait_fd; | |
496 | stream->out_fd = -1; | |
497 | stream->out_fd_offset = 0; | |
498 | stream->state = state; | |
499 | stream->mmap_len = mmap_len; | |
500 | stream->mmap_base = NULL; | |
501 | stream->output = output; | |
6df2e2c9 MD |
502 | stream->uid = uid; |
503 | stream->gid = gid; | |
00e2e675 DG |
504 | stream->net_seq_idx = net_index; |
505 | stream->metadata_flag = metadata_flag; | |
53632229 | 506 | stream->session_id = session_id; |
00e2e675 DG |
507 | strncpy(stream->path_name, path_name, sizeof(stream->path_name)); |
508 | stream->path_name[sizeof(stream->path_name) - 1] = '\0'; | |
53632229 | 509 | pthread_mutex_init(&stream->lock, NULL); |
58b1f425 DG |
510 | |
511 | /* | |
512 | * Index differently the metadata node because the thread is using an | |
513 | * internal hash table to match streams in the metadata_ht to the epoll set | |
514 | * file descriptor. | |
515 | */ | |
516 | if (metadata_flag) { | |
517 | lttng_ht_node_init_ulong(&stream->node, stream->wait_fd); | |
518 | } else { | |
519 | lttng_ht_node_init_ulong(&stream->node, stream->key); | |
520 | } | |
c30aaa51 | 521 | |
53632229 DG |
522 | /* Init session id node with the stream session id */ |
523 | lttng_ht_node_init_ulong(&stream->node_session_id, stream->session_id); | |
524 | ||
c869f647 DG |
525 | /* |
526 | * The cpu number is needed before using any ustctl_* actions. Ignored for | |
527 | * the kernel so the value does not matter. | |
528 | */ | |
529 | pthread_mutex_lock(&consumer_data.lock); | |
530 | stream->cpu = stream->chan->cpucount++; | |
531 | pthread_mutex_unlock(&consumer_data.lock); | |
532 | ||
c30aaa51 | 533 | DBG3("Allocated stream %s (key %d, shm_fd %d, wait_fd %d, mmap_len %llu," |
53632229 DG |
534 | " out_fd %d, net_seq_idx %d, session_id %" PRIu64, |
535 | stream->path_name, stream->key, stream->shm_fd, stream->wait_fd, | |
c30aaa51 | 536 | (unsigned long long) stream->mmap_len, stream->out_fd, |
53632229 | 537 | stream->net_seq_idx, stream->session_id); |
3bd1e081 | 538 | return stream; |
c80048c6 MD |
539 | |
540 | error: | |
541 | free(stream); | |
7a57cf92 | 542 | end: |
c80048c6 | 543 | return NULL; |
3bd1e081 MD |
544 | } |
545 | ||
546 | /* | |
547 | * Add a stream to the global list protected by a mutex. | |
548 | */ | |
43c34bc3 DG |
549 | static int consumer_add_stream(struct lttng_consumer_stream *stream, |
550 | struct lttng_ht *ht) | |
3bd1e081 MD |
551 | { |
552 | int ret = 0; | |
00e2e675 | 553 | struct consumer_relayd_sock_pair *relayd; |
3bd1e081 | 554 | |
e316aad5 | 555 | assert(stream); |
43c34bc3 | 556 | assert(ht); |
c77fc10a | 557 | |
e316aad5 DG |
558 | DBG3("Adding consumer stream %d", stream->key); |
559 | ||
560 | pthread_mutex_lock(&consumer_data.lock); | |
b0b335c8 | 561 | rcu_read_lock(); |
e316aad5 | 562 | |
43c34bc3 DG |
563 | /* Steal stream identifier to avoid having streams with the same key */ |
564 | consumer_steal_stream_key(stream->key, ht); | |
565 | ||
566 | lttng_ht_add_unique_ulong(ht, &stream->node); | |
00e2e675 | 567 | |
ca22feea DG |
568 | /* |
569 | * Add stream to the stream_list_ht of the consumer data. No need to steal | |
570 | * the key since the HT does not use it and we allow to add redundant keys | |
571 | * into this table. | |
572 | */ | |
573 | lttng_ht_add_ulong(consumer_data.stream_list_ht, &stream->node_session_id); | |
574 | ||
00e2e675 DG |
575 | /* Check and cleanup relayd */ |
576 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
577 | if (relayd != NULL) { | |
b0b335c8 | 578 | uatomic_inc(&relayd->refcount); |
00e2e675 DG |
579 | } |
580 | ||
e316aad5 DG |
581 | /* Update channel refcount once added without error(s). */ |
582 | uatomic_inc(&stream->chan->refcount); | |
583 | ||
584 | /* | |
585 | * When nb_init_streams reaches 0, we don't need to trigger any action in | |
586 | * terms of destroying the associated channel, because the action that | |
587 | * causes the count to become 0 also causes a stream to be added. The | |
588 | * channel deletion will thus be triggered by the following removal of this | |
589 | * stream. | |
590 | */ | |
591 | if (uatomic_read(&stream->chan->nb_init_streams) > 0) { | |
592 | uatomic_dec(&stream->chan->nb_init_streams); | |
593 | } | |
594 | ||
595 | /* Update consumer data once the node is inserted. */ | |
3bd1e081 MD |
596 | consumer_data.stream_count++; |
597 | consumer_data.need_update = 1; | |
598 | ||
e316aad5 | 599 | rcu_read_unlock(); |
3bd1e081 | 600 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 601 | |
3bd1e081 MD |
602 | return ret; |
603 | } | |
604 | ||
00e2e675 | 605 | /* |
3f8e211f DG |
606 | * Add relayd socket to global consumer data hashtable. RCU read side lock MUST |
607 | * be acquired before calling this. | |
00e2e675 | 608 | */ |
d09e1200 | 609 | static int add_relayd(struct consumer_relayd_sock_pair *relayd) |
00e2e675 DG |
610 | { |
611 | int ret = 0; | |
612 | struct lttng_ht_node_ulong *node; | |
613 | struct lttng_ht_iter iter; | |
614 | ||
615 | if (relayd == NULL) { | |
616 | ret = -1; | |
617 | goto end; | |
618 | } | |
619 | ||
00e2e675 DG |
620 | lttng_ht_lookup(consumer_data.relayd_ht, |
621 | (void *)((unsigned long) relayd->net_seq_idx), &iter); | |
622 | node = lttng_ht_iter_get_node_ulong(&iter); | |
623 | if (node != NULL) { | |
00e2e675 DG |
624 | /* Relayd already exist. Ignore the insertion */ |
625 | goto end; | |
626 | } | |
627 | lttng_ht_add_unique_ulong(consumer_data.relayd_ht, &relayd->node); | |
628 | ||
00e2e675 DG |
629 | end: |
630 | return ret; | |
631 | } | |
632 | ||
633 | /* | |
634 | * Allocate and return a consumer relayd socket. | |
635 | */ | |
636 | struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair( | |
637 | int net_seq_idx) | |
638 | { | |
639 | struct consumer_relayd_sock_pair *obj = NULL; | |
640 | ||
641 | /* Negative net sequence index is a failure */ | |
642 | if (net_seq_idx < 0) { | |
643 | goto error; | |
644 | } | |
645 | ||
646 | obj = zmalloc(sizeof(struct consumer_relayd_sock_pair)); | |
647 | if (obj == NULL) { | |
648 | PERROR("zmalloc relayd sock"); | |
649 | goto error; | |
650 | } | |
651 | ||
652 | obj->net_seq_idx = net_seq_idx; | |
653 | obj->refcount = 0; | |
173af62f | 654 | obj->destroy_flag = 0; |
00e2e675 DG |
655 | lttng_ht_node_init_ulong(&obj->node, obj->net_seq_idx); |
656 | pthread_mutex_init(&obj->ctrl_sock_mutex, NULL); | |
657 | ||
658 | error: | |
659 | return obj; | |
660 | } | |
661 | ||
662 | /* | |
663 | * Find a relayd socket pair in the global consumer data. | |
664 | * | |
665 | * Return the object if found else NULL. | |
b0b335c8 MD |
666 | * RCU read-side lock must be held across this call and while using the |
667 | * returned object. | |
00e2e675 DG |
668 | */ |
669 | struct consumer_relayd_sock_pair *consumer_find_relayd(int key) | |
670 | { | |
671 | struct lttng_ht_iter iter; | |
672 | struct lttng_ht_node_ulong *node; | |
673 | struct consumer_relayd_sock_pair *relayd = NULL; | |
674 | ||
675 | /* Negative keys are lookup failures */ | |
676 | if (key < 0) { | |
677 | goto error; | |
678 | } | |
679 | ||
00e2e675 DG |
680 | lttng_ht_lookup(consumer_data.relayd_ht, (void *)((unsigned long) key), |
681 | &iter); | |
682 | node = lttng_ht_iter_get_node_ulong(&iter); | |
683 | if (node != NULL) { | |
684 | relayd = caa_container_of(node, struct consumer_relayd_sock_pair, node); | |
685 | } | |
686 | ||
00e2e675 DG |
687 | error: |
688 | return relayd; | |
689 | } | |
690 | ||
691 | /* | |
692 | * Handle stream for relayd transmission if the stream applies for network | |
693 | * streaming where the net sequence index is set. | |
694 | * | |
695 | * Return destination file descriptor or negative value on error. | |
696 | */ | |
6197aea7 | 697 | static int write_relayd_stream_header(struct lttng_consumer_stream *stream, |
1d4dfdef DG |
698 | size_t data_size, unsigned long padding, |
699 | struct consumer_relayd_sock_pair *relayd) | |
00e2e675 DG |
700 | { |
701 | int outfd = -1, ret; | |
00e2e675 DG |
702 | struct lttcomm_relayd_data_hdr data_hdr; |
703 | ||
704 | /* Safety net */ | |
705 | assert(stream); | |
6197aea7 | 706 | assert(relayd); |
00e2e675 DG |
707 | |
708 | /* Reset data header */ | |
709 | memset(&data_hdr, 0, sizeof(data_hdr)); | |
710 | ||
00e2e675 DG |
711 | if (stream->metadata_flag) { |
712 | /* Caller MUST acquire the relayd control socket lock */ | |
713 | ret = relayd_send_metadata(&relayd->control_sock, data_size); | |
714 | if (ret < 0) { | |
715 | goto error; | |
716 | } | |
717 | ||
718 | /* Metadata are always sent on the control socket. */ | |
719 | outfd = relayd->control_sock.fd; | |
720 | } else { | |
721 | /* Set header with stream information */ | |
722 | data_hdr.stream_id = htobe64(stream->relayd_stream_id); | |
723 | data_hdr.data_size = htobe32(data_size); | |
1d4dfdef | 724 | data_hdr.padding_size = htobe32(padding); |
173af62f | 725 | data_hdr.net_seq_num = htobe64(stream->next_net_seq_num++); |
00e2e675 DG |
726 | /* Other fields are zeroed previously */ |
727 | ||
728 | ret = relayd_send_data_hdr(&relayd->data_sock, &data_hdr, | |
729 | sizeof(data_hdr)); | |
730 | if (ret < 0) { | |
731 | goto error; | |
732 | } | |
733 | ||
734 | /* Set to go on data socket */ | |
735 | outfd = relayd->data_sock.fd; | |
736 | } | |
737 | ||
738 | error: | |
739 | return outfd; | |
740 | } | |
741 | ||
702b1ea4 MD |
742 | static |
743 | void consumer_free_channel(struct rcu_head *head) | |
744 | { | |
745 | struct lttng_ht_node_ulong *node = | |
746 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
747 | struct lttng_consumer_channel *channel = | |
748 | caa_container_of(node, struct lttng_consumer_channel, node); | |
749 | ||
750 | free(channel); | |
751 | } | |
752 | ||
3bd1e081 MD |
753 | /* |
754 | * Remove a channel from the global list protected by a mutex. This | |
755 | * function is also responsible for freeing its data structures. | |
756 | */ | |
757 | void consumer_del_channel(struct lttng_consumer_channel *channel) | |
758 | { | |
759 | int ret; | |
e4421fec | 760 | struct lttng_ht_iter iter; |
3bd1e081 MD |
761 | |
762 | pthread_mutex_lock(&consumer_data.lock); | |
763 | ||
764 | switch (consumer_data.type) { | |
765 | case LTTNG_CONSUMER_KERNEL: | |
766 | break; | |
7753dea8 MD |
767 | case LTTNG_CONSUMER32_UST: |
768 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
769 | lttng_ustconsumer_del_channel(channel); |
770 | break; | |
771 | default: | |
772 | ERR("Unknown consumer_data type"); | |
773 | assert(0); | |
774 | goto end; | |
775 | } | |
776 | ||
6065ceec | 777 | rcu_read_lock(); |
04253271 MD |
778 | iter.iter.node = &channel->node.node; |
779 | ret = lttng_ht_del(consumer_data.channel_ht, &iter); | |
780 | assert(!ret); | |
6065ceec DG |
781 | rcu_read_unlock(); |
782 | ||
3bd1e081 MD |
783 | if (channel->mmap_base != NULL) { |
784 | ret = munmap(channel->mmap_base, channel->mmap_len); | |
785 | if (ret != 0) { | |
7a57cf92 | 786 | PERROR("munmap"); |
3bd1e081 MD |
787 | } |
788 | } | |
b5c5fc29 | 789 | if (channel->wait_fd >= 0 && !channel->wait_fd_is_copy) { |
4c462e79 MD |
790 | ret = close(channel->wait_fd); |
791 | if (ret) { | |
792 | PERROR("close"); | |
793 | } | |
3bd1e081 | 794 | } |
2c1dd183 | 795 | if (channel->shm_fd >= 0 && channel->wait_fd != channel->shm_fd) { |
4c462e79 MD |
796 | ret = close(channel->shm_fd); |
797 | if (ret) { | |
798 | PERROR("close"); | |
799 | } | |
3bd1e081 | 800 | } |
702b1ea4 MD |
801 | |
802 | call_rcu(&channel->node.head, consumer_free_channel); | |
3bd1e081 MD |
803 | end: |
804 | pthread_mutex_unlock(&consumer_data.lock); | |
805 | } | |
806 | ||
807 | struct lttng_consumer_channel *consumer_allocate_channel( | |
808 | int channel_key, | |
809 | int shm_fd, int wait_fd, | |
810 | uint64_t mmap_len, | |
c30aaa51 MD |
811 | uint64_t max_sb_size, |
812 | unsigned int nb_init_streams) | |
3bd1e081 MD |
813 | { |
814 | struct lttng_consumer_channel *channel; | |
815 | int ret; | |
816 | ||
276b26d1 | 817 | channel = zmalloc(sizeof(*channel)); |
3bd1e081 | 818 | if (channel == NULL) { |
7a57cf92 | 819 | PERROR("malloc struct lttng_consumer_channel"); |
3bd1e081 MD |
820 | goto end; |
821 | } | |
822 | channel->key = channel_key; | |
823 | channel->shm_fd = shm_fd; | |
824 | channel->wait_fd = wait_fd; | |
825 | channel->mmap_len = mmap_len; | |
826 | channel->max_sb_size = max_sb_size; | |
827 | channel->refcount = 0; | |
c30aaa51 | 828 | channel->nb_init_streams = nb_init_streams; |
e4421fec | 829 | lttng_ht_node_init_ulong(&channel->node, channel->key); |
3bd1e081 MD |
830 | |
831 | switch (consumer_data.type) { | |
832 | case LTTNG_CONSUMER_KERNEL: | |
833 | channel->mmap_base = NULL; | |
834 | channel->mmap_len = 0; | |
835 | break; | |
7753dea8 MD |
836 | case LTTNG_CONSUMER32_UST: |
837 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
838 | ret = lttng_ustconsumer_allocate_channel(channel); |
839 | if (ret) { | |
840 | free(channel); | |
841 | return NULL; | |
842 | } | |
843 | break; | |
844 | default: | |
845 | ERR("Unknown consumer_data type"); | |
846 | assert(0); | |
847 | goto end; | |
848 | } | |
849 | DBG("Allocated channel (key %d, shm_fd %d, wait_fd %d, mmap_len %llu, max_sb_size %llu)", | |
00e2e675 | 850 | channel->key, channel->shm_fd, channel->wait_fd, |
3bd1e081 MD |
851 | (unsigned long long) channel->mmap_len, |
852 | (unsigned long long) channel->max_sb_size); | |
853 | end: | |
854 | return channel; | |
855 | } | |
856 | ||
857 | /* | |
858 | * Add a channel to the global list protected by a mutex. | |
859 | */ | |
860 | int consumer_add_channel(struct lttng_consumer_channel *channel) | |
861 | { | |
c77fc10a DG |
862 | struct lttng_ht_node_ulong *node; |
863 | struct lttng_ht_iter iter; | |
864 | ||
3bd1e081 | 865 | pthread_mutex_lock(&consumer_data.lock); |
7ad0a0cb MD |
866 | /* Steal channel identifier, for UST */ |
867 | consumer_steal_channel_key(channel->key); | |
6065ceec | 868 | rcu_read_lock(); |
c77fc10a DG |
869 | |
870 | lttng_ht_lookup(consumer_data.channel_ht, | |
871 | (void *)((unsigned long) channel->key), &iter); | |
872 | node = lttng_ht_iter_get_node_ulong(&iter); | |
873 | if (node != NULL) { | |
874 | /* Channel already exist. Ignore the insertion */ | |
875 | goto end; | |
876 | } | |
877 | ||
04253271 | 878 | lttng_ht_add_unique_ulong(consumer_data.channel_ht, &channel->node); |
c77fc10a DG |
879 | |
880 | end: | |
6065ceec | 881 | rcu_read_unlock(); |
3bd1e081 | 882 | pthread_mutex_unlock(&consumer_data.lock); |
702b1ea4 | 883 | |
7ad0a0cb | 884 | return 0; |
3bd1e081 MD |
885 | } |
886 | ||
887 | /* | |
888 | * Allocate the pollfd structure and the local view of the out fds to avoid | |
889 | * doing a lookup in the linked list and concurrency issues when writing is | |
890 | * needed. Called with consumer_data.lock held. | |
891 | * | |
892 | * Returns the number of fds in the structures. | |
893 | */ | |
43c34bc3 | 894 | static int consumer_update_poll_array( |
3bd1e081 | 895 | struct lttng_consumer_local_data *ctx, struct pollfd **pollfd, |
43c34bc3 | 896 | struct lttng_consumer_stream **local_stream, struct lttng_ht *ht) |
3bd1e081 | 897 | { |
3bd1e081 | 898 | int i = 0; |
e4421fec DG |
899 | struct lttng_ht_iter iter; |
900 | struct lttng_consumer_stream *stream; | |
3bd1e081 MD |
901 | |
902 | DBG("Updating poll fd array"); | |
481d6c57 | 903 | rcu_read_lock(); |
43c34bc3 | 904 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { |
8994307f DG |
905 | /* |
906 | * Only active streams with an active end point can be added to the | |
907 | * poll set and local stream storage of the thread. | |
908 | * | |
909 | * There is a potential race here for endpoint_status to be updated | |
910 | * just after the check. However, this is OK since the stream(s) will | |
911 | * be deleted once the thread is notified that the end point state has | |
912 | * changed where this function will be called back again. | |
913 | */ | |
914 | if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM || | |
915 | stream->endpoint_status) { | |
3bd1e081 MD |
916 | continue; |
917 | } | |
e4421fec DG |
918 | DBG("Active FD %d", stream->wait_fd); |
919 | (*pollfd)[i].fd = stream->wait_fd; | |
3bd1e081 | 920 | (*pollfd)[i].events = POLLIN | POLLPRI; |
e4421fec | 921 | local_stream[i] = stream; |
3bd1e081 MD |
922 | i++; |
923 | } | |
481d6c57 | 924 | rcu_read_unlock(); |
3bd1e081 MD |
925 | |
926 | /* | |
50f8ae69 | 927 | * Insert the consumer_data_pipe at the end of the array and don't |
3bd1e081 MD |
928 | * increment i so nb_fd is the number of real FD. |
929 | */ | |
50f8ae69 | 930 | (*pollfd)[i].fd = ctx->consumer_data_pipe[0]; |
509bb1cf | 931 | (*pollfd)[i].events = POLLIN | POLLPRI; |
3bd1e081 MD |
932 | return i; |
933 | } | |
934 | ||
935 | /* | |
936 | * Poll on the should_quit pipe and the command socket return -1 on error and | |
937 | * should exit, 0 if data is available on the command socket | |
938 | */ | |
939 | int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll) | |
940 | { | |
941 | int num_rdy; | |
942 | ||
88f2b785 | 943 | restart: |
3bd1e081 MD |
944 | num_rdy = poll(consumer_sockpoll, 2, -1); |
945 | if (num_rdy == -1) { | |
88f2b785 MD |
946 | /* |
947 | * Restart interrupted system call. | |
948 | */ | |
949 | if (errno == EINTR) { | |
950 | goto restart; | |
951 | } | |
7a57cf92 | 952 | PERROR("Poll error"); |
3bd1e081 MD |
953 | goto exit; |
954 | } | |
509bb1cf | 955 | if (consumer_sockpoll[0].revents & (POLLIN | POLLPRI)) { |
3bd1e081 MD |
956 | DBG("consumer_should_quit wake up"); |
957 | goto exit; | |
958 | } | |
959 | return 0; | |
960 | ||
961 | exit: | |
962 | return -1; | |
963 | } | |
964 | ||
965 | /* | |
966 | * Set the error socket. | |
967 | */ | |
968 | void lttng_consumer_set_error_sock( | |
969 | struct lttng_consumer_local_data *ctx, int sock) | |
970 | { | |
971 | ctx->consumer_error_socket = sock; | |
972 | } | |
973 | ||
974 | /* | |
975 | * Set the command socket path. | |
976 | */ | |
3bd1e081 MD |
977 | void lttng_consumer_set_command_sock_path( |
978 | struct lttng_consumer_local_data *ctx, char *sock) | |
979 | { | |
980 | ctx->consumer_command_sock_path = sock; | |
981 | } | |
982 | ||
983 | /* | |
984 | * Send return code to the session daemon. | |
985 | * If the socket is not defined, we return 0, it is not a fatal error | |
986 | */ | |
987 | int lttng_consumer_send_error( | |
988 | struct lttng_consumer_local_data *ctx, int cmd) | |
989 | { | |
990 | if (ctx->consumer_error_socket > 0) { | |
991 | return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd, | |
992 | sizeof(enum lttcomm_sessiond_command)); | |
993 | } | |
994 | ||
995 | return 0; | |
996 | } | |
997 | ||
998 | /* | |
999 | * Close all the tracefiles and stream fds, should be called when all instances | |
1000 | * are destroyed. | |
1001 | */ | |
1002 | void lttng_consumer_cleanup(void) | |
1003 | { | |
e4421fec | 1004 | struct lttng_ht_iter iter; |
6065ceec DG |
1005 | struct lttng_ht_node_ulong *node; |
1006 | ||
1007 | rcu_read_lock(); | |
3bd1e081 | 1008 | |
6065ceec DG |
1009 | cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, node, |
1010 | node) { | |
702b1ea4 MD |
1011 | struct lttng_consumer_channel *channel = |
1012 | caa_container_of(node, struct lttng_consumer_channel, node); | |
1013 | consumer_del_channel(channel); | |
3bd1e081 | 1014 | } |
6065ceec DG |
1015 | |
1016 | rcu_read_unlock(); | |
d6ce1df2 | 1017 | |
d6ce1df2 | 1018 | lttng_ht_destroy(consumer_data.channel_ht); |
3bd1e081 MD |
1019 | } |
1020 | ||
1021 | /* | |
1022 | * Called from signal handler. | |
1023 | */ | |
1024 | void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx) | |
1025 | { | |
1026 | int ret; | |
1027 | consumer_quit = 1; | |
6f94560a MD |
1028 | do { |
1029 | ret = write(ctx->consumer_should_quit[1], "4", 1); | |
1030 | } while (ret < 0 && errno == EINTR); | |
3bd1e081 | 1031 | if (ret < 0) { |
7a57cf92 | 1032 | PERROR("write consumer quit"); |
3bd1e081 | 1033 | } |
ab1027f4 DG |
1034 | |
1035 | DBG("Consumer flag that it should quit"); | |
3bd1e081 MD |
1036 | } |
1037 | ||
00e2e675 DG |
1038 | void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream, |
1039 | off_t orig_offset) | |
3bd1e081 MD |
1040 | { |
1041 | int outfd = stream->out_fd; | |
1042 | ||
1043 | /* | |
1044 | * This does a blocking write-and-wait on any page that belongs to the | |
1045 | * subbuffer prior to the one we just wrote. | |
1046 | * Don't care about error values, as these are just hints and ways to | |
1047 | * limit the amount of page cache used. | |
1048 | */ | |
1049 | if (orig_offset < stream->chan->max_sb_size) { | |
1050 | return; | |
1051 | } | |
b9182dd9 | 1052 | lttng_sync_file_range(outfd, orig_offset - stream->chan->max_sb_size, |
3bd1e081 MD |
1053 | stream->chan->max_sb_size, |
1054 | SYNC_FILE_RANGE_WAIT_BEFORE | |
1055 | | SYNC_FILE_RANGE_WRITE | |
1056 | | SYNC_FILE_RANGE_WAIT_AFTER); | |
1057 | /* | |
1058 | * Give hints to the kernel about how we access the file: | |
1059 | * POSIX_FADV_DONTNEED : we won't re-access data in a near future after | |
1060 | * we write it. | |
1061 | * | |
1062 | * We need to call fadvise again after the file grows because the | |
1063 | * kernel does not seem to apply fadvise to non-existing parts of the | |
1064 | * file. | |
1065 | * | |
1066 | * Call fadvise _after_ having waited for the page writeback to | |
1067 | * complete because the dirty page writeback semantic is not well | |
1068 | * defined. So it can be expected to lead to lower throughput in | |
1069 | * streaming. | |
1070 | */ | |
1071 | posix_fadvise(outfd, orig_offset - stream->chan->max_sb_size, | |
1072 | stream->chan->max_sb_size, POSIX_FADV_DONTNEED); | |
1073 | } | |
1074 | ||
1075 | /* | |
1076 | * Initialise the necessary environnement : | |
1077 | * - create a new context | |
1078 | * - create the poll_pipe | |
1079 | * - create the should_quit pipe (for signal handler) | |
1080 | * - create the thread pipe (for splice) | |
1081 | * | |
1082 | * Takes a function pointer as argument, this function is called when data is | |
1083 | * available on a buffer. This function is responsible to do the | |
1084 | * kernctl_get_next_subbuf, read the data with mmap or splice depending on the | |
1085 | * buffer configuration and then kernctl_put_next_subbuf at the end. | |
1086 | * | |
1087 | * Returns a pointer to the new context or NULL on error. | |
1088 | */ | |
1089 | struct lttng_consumer_local_data *lttng_consumer_create( | |
1090 | enum lttng_consumer_type type, | |
4078b776 | 1091 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
d41f73b7 | 1092 | struct lttng_consumer_local_data *ctx), |
3bd1e081 MD |
1093 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
1094 | int (*recv_stream)(struct lttng_consumer_stream *stream), | |
1095 | int (*update_stream)(int stream_key, uint32_t state)) | |
1096 | { | |
1097 | int ret, i; | |
1098 | struct lttng_consumer_local_data *ctx; | |
1099 | ||
1100 | assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN || | |
1101 | consumer_data.type == type); | |
1102 | consumer_data.type = type; | |
1103 | ||
effcf122 | 1104 | ctx = zmalloc(sizeof(struct lttng_consumer_local_data)); |
3bd1e081 | 1105 | if (ctx == NULL) { |
7a57cf92 | 1106 | PERROR("allocating context"); |
3bd1e081 MD |
1107 | goto error; |
1108 | } | |
1109 | ||
1110 | ctx->consumer_error_socket = -1; | |
1111 | /* assign the callbacks */ | |
1112 | ctx->on_buffer_ready = buffer_ready; | |
1113 | ctx->on_recv_channel = recv_channel; | |
1114 | ctx->on_recv_stream = recv_stream; | |
1115 | ctx->on_update_stream = update_stream; | |
1116 | ||
50f8ae69 | 1117 | ret = pipe(ctx->consumer_data_pipe); |
3bd1e081 | 1118 | if (ret < 0) { |
7a57cf92 | 1119 | PERROR("Error creating poll pipe"); |
3bd1e081 MD |
1120 | goto error_poll_pipe; |
1121 | } | |
1122 | ||
04fdd819 | 1123 | /* set read end of the pipe to non-blocking */ |
50f8ae69 | 1124 | ret = fcntl(ctx->consumer_data_pipe[0], F_SETFL, O_NONBLOCK); |
04fdd819 | 1125 | if (ret < 0) { |
7a57cf92 | 1126 | PERROR("fcntl O_NONBLOCK"); |
04fdd819 MD |
1127 | goto error_poll_fcntl; |
1128 | } | |
1129 | ||
1130 | /* set write end of the pipe to non-blocking */ | |
50f8ae69 | 1131 | ret = fcntl(ctx->consumer_data_pipe[1], F_SETFL, O_NONBLOCK); |
04fdd819 | 1132 | if (ret < 0) { |
7a57cf92 | 1133 | PERROR("fcntl O_NONBLOCK"); |
04fdd819 MD |
1134 | goto error_poll_fcntl; |
1135 | } | |
1136 | ||
3bd1e081 MD |
1137 | ret = pipe(ctx->consumer_should_quit); |
1138 | if (ret < 0) { | |
7a57cf92 | 1139 | PERROR("Error creating recv pipe"); |
3bd1e081 MD |
1140 | goto error_quit_pipe; |
1141 | } | |
1142 | ||
1143 | ret = pipe(ctx->consumer_thread_pipe); | |
1144 | if (ret < 0) { | |
7a57cf92 | 1145 | PERROR("Error creating thread pipe"); |
3bd1e081 MD |
1146 | goto error_thread_pipe; |
1147 | } | |
1148 | ||
fb3a43a9 DG |
1149 | ret = utils_create_pipe(ctx->consumer_metadata_pipe); |
1150 | if (ret < 0) { | |
1151 | goto error_metadata_pipe; | |
1152 | } | |
3bd1e081 | 1153 | |
fb3a43a9 DG |
1154 | ret = utils_create_pipe(ctx->consumer_splice_metadata_pipe); |
1155 | if (ret < 0) { | |
1156 | goto error_splice_pipe; | |
1157 | } | |
1158 | ||
1159 | return ctx; | |
3bd1e081 | 1160 | |
fb3a43a9 DG |
1161 | error_splice_pipe: |
1162 | utils_close_pipe(ctx->consumer_metadata_pipe); | |
1163 | error_metadata_pipe: | |
1164 | utils_close_pipe(ctx->consumer_thread_pipe); | |
3bd1e081 MD |
1165 | error_thread_pipe: |
1166 | for (i = 0; i < 2; i++) { | |
1167 | int err; | |
1168 | ||
1169 | err = close(ctx->consumer_should_quit[i]); | |
4c462e79 MD |
1170 | if (err) { |
1171 | PERROR("close"); | |
1172 | } | |
3bd1e081 | 1173 | } |
04fdd819 | 1174 | error_poll_fcntl: |
3bd1e081 MD |
1175 | error_quit_pipe: |
1176 | for (i = 0; i < 2; i++) { | |
1177 | int err; | |
1178 | ||
50f8ae69 | 1179 | err = close(ctx->consumer_data_pipe[i]); |
4c462e79 MD |
1180 | if (err) { |
1181 | PERROR("close"); | |
1182 | } | |
3bd1e081 MD |
1183 | } |
1184 | error_poll_pipe: | |
1185 | free(ctx); | |
1186 | error: | |
1187 | return NULL; | |
1188 | } | |
1189 | ||
1190 | /* | |
1191 | * Close all fds associated with the instance and free the context. | |
1192 | */ | |
1193 | void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx) | |
1194 | { | |
4c462e79 MD |
1195 | int ret; |
1196 | ||
ab1027f4 DG |
1197 | DBG("Consumer destroying it. Closing everything."); |
1198 | ||
4c462e79 MD |
1199 | ret = close(ctx->consumer_error_socket); |
1200 | if (ret) { | |
1201 | PERROR("close"); | |
1202 | } | |
1203 | ret = close(ctx->consumer_thread_pipe[0]); | |
1204 | if (ret) { | |
1205 | PERROR("close"); | |
1206 | } | |
1207 | ret = close(ctx->consumer_thread_pipe[1]); | |
1208 | if (ret) { | |
1209 | PERROR("close"); | |
1210 | } | |
50f8ae69 | 1211 | ret = close(ctx->consumer_data_pipe[0]); |
4c462e79 MD |
1212 | if (ret) { |
1213 | PERROR("close"); | |
1214 | } | |
50f8ae69 | 1215 | ret = close(ctx->consumer_data_pipe[1]); |
4c462e79 MD |
1216 | if (ret) { |
1217 | PERROR("close"); | |
1218 | } | |
1219 | ret = close(ctx->consumer_should_quit[0]); | |
1220 | if (ret) { | |
1221 | PERROR("close"); | |
1222 | } | |
1223 | ret = close(ctx->consumer_should_quit[1]); | |
1224 | if (ret) { | |
1225 | PERROR("close"); | |
1226 | } | |
fb3a43a9 DG |
1227 | utils_close_pipe(ctx->consumer_splice_metadata_pipe); |
1228 | ||
3bd1e081 MD |
1229 | unlink(ctx->consumer_command_sock_path); |
1230 | free(ctx); | |
1231 | } | |
1232 | ||
6197aea7 DG |
1233 | /* |
1234 | * Write the metadata stream id on the specified file descriptor. | |
1235 | */ | |
1236 | static int write_relayd_metadata_id(int fd, | |
1237 | struct lttng_consumer_stream *stream, | |
1d4dfdef DG |
1238 | struct consumer_relayd_sock_pair *relayd, |
1239 | unsigned long padding) | |
6197aea7 DG |
1240 | { |
1241 | int ret; | |
1d4dfdef | 1242 | struct lttcomm_relayd_metadata_payload hdr; |
6197aea7 | 1243 | |
1d4dfdef DG |
1244 | hdr.stream_id = htobe64(stream->relayd_stream_id); |
1245 | hdr.padding_size = htobe32(padding); | |
6197aea7 | 1246 | do { |
1d4dfdef | 1247 | ret = write(fd, (void *) &hdr, sizeof(hdr)); |
6197aea7 DG |
1248 | } while (ret < 0 && errno == EINTR); |
1249 | if (ret < 0) { | |
1250 | PERROR("write metadata stream id"); | |
1251 | goto end; | |
1252 | } | |
1d4dfdef DG |
1253 | DBG("Metadata stream id %" PRIu64 " with padding %lu written before data", |
1254 | stream->relayd_stream_id, padding); | |
6197aea7 DG |
1255 | |
1256 | end: | |
1257 | return ret; | |
1258 | } | |
1259 | ||
3bd1e081 | 1260 | /* |
09e26845 DG |
1261 | * Mmap the ring buffer, read it and write the data to the tracefile. This is a |
1262 | * core function for writing trace buffers to either the local filesystem or | |
1263 | * the network. | |
1264 | * | |
1265 | * Careful review MUST be put if any changes occur! | |
3bd1e081 MD |
1266 | * |
1267 | * Returns the number of bytes written | |
1268 | */ | |
4078b776 | 1269 | ssize_t lttng_consumer_on_read_subbuffer_mmap( |
3bd1e081 | 1270 | struct lttng_consumer_local_data *ctx, |
1d4dfdef DG |
1271 | struct lttng_consumer_stream *stream, unsigned long len, |
1272 | unsigned long padding) | |
3bd1e081 | 1273 | { |
f02e1e8a DG |
1274 | unsigned long mmap_offset; |
1275 | ssize_t ret = 0, written = 0; | |
1276 | off_t orig_offset = stream->out_fd_offset; | |
1277 | /* Default is on the disk */ | |
1278 | int outfd = stream->out_fd; | |
f02e1e8a | 1279 | struct consumer_relayd_sock_pair *relayd = NULL; |
8994307f | 1280 | unsigned int relayd_hang_up = 0; |
f02e1e8a DG |
1281 | |
1282 | /* RCU lock for the relayd pointer */ | |
1283 | rcu_read_lock(); | |
1284 | ||
c8f59ee5 DG |
1285 | pthread_mutex_lock(&stream->lock); |
1286 | ||
f02e1e8a DG |
1287 | /* Flag that the current stream if set for network streaming. */ |
1288 | if (stream->net_seq_idx != -1) { | |
1289 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1290 | if (relayd == NULL) { | |
1291 | goto end; | |
1292 | } | |
1293 | } | |
1294 | ||
1295 | /* get the offset inside the fd to mmap */ | |
3bd1e081 MD |
1296 | switch (consumer_data.type) { |
1297 | case LTTNG_CONSUMER_KERNEL: | |
f02e1e8a DG |
1298 | ret = kernctl_get_mmap_read_offset(stream->wait_fd, &mmap_offset); |
1299 | break; | |
7753dea8 MD |
1300 | case LTTNG_CONSUMER32_UST: |
1301 | case LTTNG_CONSUMER64_UST: | |
f02e1e8a DG |
1302 | ret = lttng_ustctl_get_mmap_read_offset(stream->chan->handle, |
1303 | stream->buf, &mmap_offset); | |
1304 | break; | |
3bd1e081 MD |
1305 | default: |
1306 | ERR("Unknown consumer_data type"); | |
1307 | assert(0); | |
1308 | } | |
f02e1e8a DG |
1309 | if (ret != 0) { |
1310 | errno = -ret; | |
1311 | PERROR("tracer ctl get_mmap_read_offset"); | |
1312 | written = ret; | |
1313 | goto end; | |
1314 | } | |
b9182dd9 | 1315 | |
f02e1e8a DG |
1316 | /* Handle stream on the relayd if the output is on the network */ |
1317 | if (relayd) { | |
1318 | unsigned long netlen = len; | |
1319 | ||
1320 | /* | |
1321 | * Lock the control socket for the complete duration of the function | |
1322 | * since from this point on we will use the socket. | |
1323 | */ | |
1324 | if (stream->metadata_flag) { | |
1325 | /* Metadata requires the control socket. */ | |
1326 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1d4dfdef | 1327 | netlen += sizeof(struct lttcomm_relayd_metadata_payload); |
f02e1e8a DG |
1328 | } |
1329 | ||
1d4dfdef | 1330 | ret = write_relayd_stream_header(stream, netlen, padding, relayd); |
f02e1e8a DG |
1331 | if (ret >= 0) { |
1332 | /* Use the returned socket. */ | |
1333 | outfd = ret; | |
1334 | ||
1335 | /* Write metadata stream id before payload */ | |
1336 | if (stream->metadata_flag) { | |
1d4dfdef | 1337 | ret = write_relayd_metadata_id(outfd, stream, relayd, padding); |
f02e1e8a | 1338 | if (ret < 0) { |
f02e1e8a | 1339 | written = ret; |
8994307f DG |
1340 | /* Socket operation failed. We consider the relayd dead */ |
1341 | if (ret == -EPIPE || ret == -EINVAL) { | |
1342 | relayd_hang_up = 1; | |
1343 | goto write_error; | |
1344 | } | |
f02e1e8a DG |
1345 | goto end; |
1346 | } | |
f02e1e8a | 1347 | } |
8994307f DG |
1348 | } else { |
1349 | /* Socket operation failed. We consider the relayd dead */ | |
1350 | if (ret == -EPIPE || ret == -EINVAL) { | |
1351 | relayd_hang_up = 1; | |
1352 | goto write_error; | |
1353 | } | |
1354 | /* Else, use the default set before which is the filesystem. */ | |
f02e1e8a | 1355 | } |
1d4dfdef DG |
1356 | } else { |
1357 | /* No streaming, we have to set the len with the full padding */ | |
1358 | len += padding; | |
f02e1e8a DG |
1359 | } |
1360 | ||
1361 | while (len > 0) { | |
1362 | do { | |
1363 | ret = write(outfd, stream->mmap_base + mmap_offset, len); | |
1364 | } while (ret < 0 && errno == EINTR); | |
1d4dfdef | 1365 | DBG("Consumer mmap write() ret %zd (len %lu)", ret, len); |
f02e1e8a DG |
1366 | if (ret < 0) { |
1367 | PERROR("Error in file write"); | |
1368 | if (written == 0) { | |
1369 | written = ret; | |
1370 | } | |
8994307f DG |
1371 | /* Socket operation failed. We consider the relayd dead */ |
1372 | if (errno == EPIPE || errno == EINVAL) { | |
1373 | relayd_hang_up = 1; | |
1374 | goto write_error; | |
1375 | } | |
f02e1e8a DG |
1376 | goto end; |
1377 | } else if (ret > len) { | |
77c7c900 | 1378 | PERROR("Error in file write (ret %zd > len %lu)", ret, len); |
f02e1e8a DG |
1379 | written += ret; |
1380 | goto end; | |
1381 | } else { | |
1382 | len -= ret; | |
1383 | mmap_offset += ret; | |
1384 | } | |
f02e1e8a DG |
1385 | |
1386 | /* This call is useless on a socket so better save a syscall. */ | |
1387 | if (!relayd) { | |
1388 | /* This won't block, but will start writeout asynchronously */ | |
1389 | lttng_sync_file_range(outfd, stream->out_fd_offset, ret, | |
1390 | SYNC_FILE_RANGE_WRITE); | |
1391 | stream->out_fd_offset += ret; | |
1392 | } | |
1393 | written += ret; | |
1394 | } | |
1395 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
1396 | ||
8994307f DG |
1397 | write_error: |
1398 | /* | |
1399 | * This is a special case that the relayd has closed its socket. Let's | |
1400 | * cleanup the relayd object and all associated streams. | |
1401 | */ | |
1402 | if (relayd && relayd_hang_up) { | |
1403 | cleanup_relayd(relayd, ctx); | |
1404 | } | |
1405 | ||
f02e1e8a DG |
1406 | end: |
1407 | /* Unlock only if ctrl socket used */ | |
1408 | if (relayd && stream->metadata_flag) { | |
1409 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1410 | } | |
6f6eda74 | 1411 | pthread_mutex_unlock(&stream->lock); |
f02e1e8a DG |
1412 | |
1413 | rcu_read_unlock(); | |
1414 | return written; | |
3bd1e081 MD |
1415 | } |
1416 | ||
1417 | /* | |
1418 | * Splice the data from the ring buffer to the tracefile. | |
1419 | * | |
1420 | * Returns the number of bytes spliced. | |
1421 | */ | |
4078b776 | 1422 | ssize_t lttng_consumer_on_read_subbuffer_splice( |
3bd1e081 | 1423 | struct lttng_consumer_local_data *ctx, |
1d4dfdef DG |
1424 | struct lttng_consumer_stream *stream, unsigned long len, |
1425 | unsigned long padding) | |
3bd1e081 | 1426 | { |
f02e1e8a DG |
1427 | ssize_t ret = 0, written = 0, ret_splice = 0; |
1428 | loff_t offset = 0; | |
1429 | off_t orig_offset = stream->out_fd_offset; | |
1430 | int fd = stream->wait_fd; | |
1431 | /* Default is on the disk */ | |
1432 | int outfd = stream->out_fd; | |
f02e1e8a | 1433 | struct consumer_relayd_sock_pair *relayd = NULL; |
fb3a43a9 | 1434 | int *splice_pipe; |
8994307f | 1435 | unsigned int relayd_hang_up = 0; |
f02e1e8a | 1436 | |
3bd1e081 MD |
1437 | switch (consumer_data.type) { |
1438 | case LTTNG_CONSUMER_KERNEL: | |
f02e1e8a | 1439 | break; |
7753dea8 MD |
1440 | case LTTNG_CONSUMER32_UST: |
1441 | case LTTNG_CONSUMER64_UST: | |
f02e1e8a | 1442 | /* Not supported for user space tracing */ |
3bd1e081 MD |
1443 | return -ENOSYS; |
1444 | default: | |
1445 | ERR("Unknown consumer_data type"); | |
1446 | assert(0); | |
3bd1e081 MD |
1447 | } |
1448 | ||
f02e1e8a DG |
1449 | /* RCU lock for the relayd pointer */ |
1450 | rcu_read_lock(); | |
1451 | ||
c8f59ee5 DG |
1452 | pthread_mutex_lock(&stream->lock); |
1453 | ||
f02e1e8a DG |
1454 | /* Flag that the current stream if set for network streaming. */ |
1455 | if (stream->net_seq_idx != -1) { | |
1456 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1457 | if (relayd == NULL) { | |
1458 | goto end; | |
1459 | } | |
1460 | } | |
1461 | ||
fb3a43a9 DG |
1462 | /* |
1463 | * Choose right pipe for splice. Metadata and trace data are handled by | |
1464 | * different threads hence the use of two pipes in order not to race or | |
1465 | * corrupt the written data. | |
1466 | */ | |
1467 | if (stream->metadata_flag) { | |
1468 | splice_pipe = ctx->consumer_splice_metadata_pipe; | |
1469 | } else { | |
1470 | splice_pipe = ctx->consumer_thread_pipe; | |
1471 | } | |
1472 | ||
f02e1e8a | 1473 | /* Write metadata stream id before payload */ |
1d4dfdef DG |
1474 | if (relayd) { |
1475 | int total_len = len; | |
f02e1e8a | 1476 | |
1d4dfdef DG |
1477 | if (stream->metadata_flag) { |
1478 | /* | |
1479 | * Lock the control socket for the complete duration of the function | |
1480 | * since from this point on we will use the socket. | |
1481 | */ | |
1482 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1483 | ||
1484 | ret = write_relayd_metadata_id(splice_pipe[1], stream, relayd, | |
1485 | padding); | |
1486 | if (ret < 0) { | |
1487 | written = ret; | |
8994307f DG |
1488 | /* Socket operation failed. We consider the relayd dead */ |
1489 | if (ret == -EBADF) { | |
1490 | WARN("Remote relayd disconnected. Stopping"); | |
1491 | relayd_hang_up = 1; | |
1492 | goto write_error; | |
1493 | } | |
1d4dfdef DG |
1494 | goto end; |
1495 | } | |
1496 | ||
1497 | total_len += sizeof(struct lttcomm_relayd_metadata_payload); | |
1498 | } | |
1499 | ||
1500 | ret = write_relayd_stream_header(stream, total_len, padding, relayd); | |
1501 | if (ret >= 0) { | |
1502 | /* Use the returned socket. */ | |
1503 | outfd = ret; | |
1504 | } else { | |
8994307f DG |
1505 | /* Socket operation failed. We consider the relayd dead */ |
1506 | if (ret == -EBADF) { | |
1507 | WARN("Remote relayd disconnected. Stopping"); | |
1508 | relayd_hang_up = 1; | |
1509 | goto write_error; | |
1510 | } | |
f02e1e8a DG |
1511 | goto end; |
1512 | } | |
1d4dfdef DG |
1513 | } else { |
1514 | /* No streaming, we have to set the len with the full padding */ | |
1515 | len += padding; | |
f02e1e8a DG |
1516 | } |
1517 | ||
1518 | while (len > 0) { | |
1d4dfdef DG |
1519 | DBG("splice chan to pipe offset %lu of len %lu (fd : %d, pipe: %d)", |
1520 | (unsigned long)offset, len, fd, splice_pipe[1]); | |
fb3a43a9 | 1521 | ret_splice = splice(fd, &offset, splice_pipe[1], NULL, len, |
f02e1e8a DG |
1522 | SPLICE_F_MOVE | SPLICE_F_MORE); |
1523 | DBG("splice chan to pipe, ret %zd", ret_splice); | |
1524 | if (ret_splice < 0) { | |
1525 | PERROR("Error in relay splice"); | |
1526 | if (written == 0) { | |
1527 | written = ret_splice; | |
1528 | } | |
1529 | ret = errno; | |
1530 | goto splice_error; | |
1531 | } | |
1532 | ||
1533 | /* Handle stream on the relayd if the output is on the network */ | |
1534 | if (relayd) { | |
1535 | if (stream->metadata_flag) { | |
1d4dfdef DG |
1536 | size_t metadata_payload_size = |
1537 | sizeof(struct lttcomm_relayd_metadata_payload); | |
1538 | ||
f02e1e8a | 1539 | /* Update counter to fit the spliced data */ |
1d4dfdef DG |
1540 | ret_splice += metadata_payload_size; |
1541 | len += metadata_payload_size; | |
f02e1e8a DG |
1542 | /* |
1543 | * We do this so the return value can match the len passed as | |
1544 | * argument to this function. | |
1545 | */ | |
1d4dfdef | 1546 | written -= metadata_payload_size; |
f02e1e8a DG |
1547 | } |
1548 | } | |
1549 | ||
1550 | /* Splice data out */ | |
fb3a43a9 | 1551 | ret_splice = splice(splice_pipe[0], NULL, outfd, NULL, |
f02e1e8a | 1552 | ret_splice, SPLICE_F_MOVE | SPLICE_F_MORE); |
1d4dfdef | 1553 | DBG("Consumer splice pipe to file, ret %zd", ret_splice); |
f02e1e8a DG |
1554 | if (ret_splice < 0) { |
1555 | PERROR("Error in file splice"); | |
1556 | if (written == 0) { | |
1557 | written = ret_splice; | |
1558 | } | |
8994307f DG |
1559 | /* Socket operation failed. We consider the relayd dead */ |
1560 | if (errno == EBADF) { | |
1561 | WARN("Remote relayd disconnected. Stopping"); | |
1562 | relayd_hang_up = 1; | |
1563 | goto write_error; | |
1564 | } | |
f02e1e8a DG |
1565 | ret = errno; |
1566 | goto splice_error; | |
1567 | } else if (ret_splice > len) { | |
1568 | errno = EINVAL; | |
1569 | PERROR("Wrote more data than requested %zd (len: %lu)", | |
1570 | ret_splice, len); | |
1571 | written += ret_splice; | |
1572 | ret = errno; | |
1573 | goto splice_error; | |
1574 | } | |
1575 | len -= ret_splice; | |
1576 | ||
1577 | /* This call is useless on a socket so better save a syscall. */ | |
1578 | if (!relayd) { | |
1579 | /* This won't block, but will start writeout asynchronously */ | |
1580 | lttng_sync_file_range(outfd, stream->out_fd_offset, ret_splice, | |
1581 | SYNC_FILE_RANGE_WRITE); | |
1582 | stream->out_fd_offset += ret_splice; | |
1583 | } | |
1584 | written += ret_splice; | |
1585 | } | |
1586 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
1587 | ||
1588 | ret = ret_splice; | |
1589 | ||
1590 | goto end; | |
1591 | ||
8994307f DG |
1592 | write_error: |
1593 | /* | |
1594 | * This is a special case that the relayd has closed its socket. Let's | |
1595 | * cleanup the relayd object and all associated streams. | |
1596 | */ | |
1597 | if (relayd && relayd_hang_up) { | |
1598 | cleanup_relayd(relayd, ctx); | |
1599 | /* Skip splice error so the consumer does not fail */ | |
1600 | goto end; | |
1601 | } | |
1602 | ||
f02e1e8a DG |
1603 | splice_error: |
1604 | /* send the appropriate error description to sessiond */ | |
1605 | switch (ret) { | |
f02e1e8a | 1606 | case EINVAL: |
f73fabfd | 1607 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_EINVAL); |
f02e1e8a DG |
1608 | break; |
1609 | case ENOMEM: | |
f73fabfd | 1610 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ENOMEM); |
f02e1e8a DG |
1611 | break; |
1612 | case ESPIPE: | |
f73fabfd | 1613 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ESPIPE); |
f02e1e8a DG |
1614 | break; |
1615 | } | |
1616 | ||
1617 | end: | |
1618 | if (relayd && stream->metadata_flag) { | |
1619 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1620 | } | |
6f6eda74 | 1621 | pthread_mutex_unlock(&stream->lock); |
f02e1e8a DG |
1622 | |
1623 | rcu_read_unlock(); | |
1624 | return written; | |
3bd1e081 MD |
1625 | } |
1626 | ||
1627 | /* | |
1628 | * Take a snapshot for a specific fd | |
1629 | * | |
1630 | * Returns 0 on success, < 0 on error | |
1631 | */ | |
1632 | int lttng_consumer_take_snapshot(struct lttng_consumer_local_data *ctx, | |
1633 | struct lttng_consumer_stream *stream) | |
1634 | { | |
1635 | switch (consumer_data.type) { | |
1636 | case LTTNG_CONSUMER_KERNEL: | |
1637 | return lttng_kconsumer_take_snapshot(ctx, stream); | |
7753dea8 MD |
1638 | case LTTNG_CONSUMER32_UST: |
1639 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1640 | return lttng_ustconsumer_take_snapshot(ctx, stream); |
1641 | default: | |
1642 | ERR("Unknown consumer_data type"); | |
1643 | assert(0); | |
1644 | return -ENOSYS; | |
1645 | } | |
1646 | ||
1647 | } | |
1648 | ||
1649 | /* | |
1650 | * Get the produced position | |
1651 | * | |
1652 | * Returns 0 on success, < 0 on error | |
1653 | */ | |
1654 | int lttng_consumer_get_produced_snapshot( | |
1655 | struct lttng_consumer_local_data *ctx, | |
1656 | struct lttng_consumer_stream *stream, | |
1657 | unsigned long *pos) | |
1658 | { | |
1659 | switch (consumer_data.type) { | |
1660 | case LTTNG_CONSUMER_KERNEL: | |
1661 | return lttng_kconsumer_get_produced_snapshot(ctx, stream, pos); | |
7753dea8 MD |
1662 | case LTTNG_CONSUMER32_UST: |
1663 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1664 | return lttng_ustconsumer_get_produced_snapshot(ctx, stream, pos); |
1665 | default: | |
1666 | ERR("Unknown consumer_data type"); | |
1667 | assert(0); | |
1668 | return -ENOSYS; | |
1669 | } | |
1670 | } | |
1671 | ||
1672 | int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, | |
1673 | int sock, struct pollfd *consumer_sockpoll) | |
1674 | { | |
1675 | switch (consumer_data.type) { | |
1676 | case LTTNG_CONSUMER_KERNEL: | |
1677 | return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
7753dea8 MD |
1678 | case LTTNG_CONSUMER32_UST: |
1679 | case LTTNG_CONSUMER64_UST: | |
3bd1e081 MD |
1680 | return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll); |
1681 | default: | |
1682 | ERR("Unknown consumer_data type"); | |
1683 | assert(0); | |
1684 | return -ENOSYS; | |
1685 | } | |
1686 | } | |
1687 | ||
43c34bc3 DG |
1688 | /* |
1689 | * Iterate over all streams of the hashtable and free them properly. | |
1690 | * | |
1691 | * WARNING: *MUST* be used with data stream only. | |
1692 | */ | |
1693 | static void destroy_data_stream_ht(struct lttng_ht *ht) | |
1694 | { | |
1695 | int ret; | |
1696 | struct lttng_ht_iter iter; | |
1697 | struct lttng_consumer_stream *stream; | |
1698 | ||
1699 | if (ht == NULL) { | |
1700 | return; | |
1701 | } | |
1702 | ||
1703 | rcu_read_lock(); | |
1704 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { | |
1705 | ret = lttng_ht_del(ht, &iter); | |
1706 | assert(!ret); | |
1707 | ||
1708 | call_rcu(&stream->node.head, consumer_free_stream); | |
1709 | } | |
1710 | rcu_read_unlock(); | |
1711 | ||
1712 | lttng_ht_destroy(ht); | |
1713 | } | |
1714 | ||
fb3a43a9 | 1715 | /* |
f724d81e | 1716 | * Iterate over all streams of the hashtable and free them properly. |
e316aad5 DG |
1717 | * |
1718 | * XXX: Should not be only for metadata stream or else use an other name. | |
fb3a43a9 DG |
1719 | */ |
1720 | static void destroy_stream_ht(struct lttng_ht *ht) | |
1721 | { | |
1722 | int ret; | |
1723 | struct lttng_ht_iter iter; | |
1724 | struct lttng_consumer_stream *stream; | |
1725 | ||
1726 | if (ht == NULL) { | |
1727 | return; | |
1728 | } | |
1729 | ||
d09e1200 | 1730 | rcu_read_lock(); |
58b1f425 | 1731 | cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { |
fb3a43a9 DG |
1732 | ret = lttng_ht_del(ht, &iter); |
1733 | assert(!ret); | |
1734 | ||
58b1f425 | 1735 | call_rcu(&stream->node.head, consumer_free_stream); |
fb3a43a9 | 1736 | } |
d09e1200 | 1737 | rcu_read_unlock(); |
fb3a43a9 DG |
1738 | |
1739 | lttng_ht_destroy(ht); | |
1740 | } | |
1741 | ||
1742 | /* | |
1743 | * Clean up a metadata stream and free its memory. | |
1744 | */ | |
e316aad5 DG |
1745 | void consumer_del_metadata_stream(struct lttng_consumer_stream *stream, |
1746 | struct lttng_ht *ht) | |
fb3a43a9 DG |
1747 | { |
1748 | int ret; | |
e316aad5 DG |
1749 | struct lttng_ht_iter iter; |
1750 | struct lttng_consumer_channel *free_chan = NULL; | |
fb3a43a9 DG |
1751 | struct consumer_relayd_sock_pair *relayd; |
1752 | ||
1753 | assert(stream); | |
1754 | /* | |
1755 | * This call should NEVER receive regular stream. It must always be | |
1756 | * metadata stream and this is crucial for data structure synchronization. | |
1757 | */ | |
1758 | assert(stream->metadata_flag); | |
1759 | ||
e316aad5 DG |
1760 | DBG3("Consumer delete metadata stream %d", stream->wait_fd); |
1761 | ||
1762 | if (ht == NULL) { | |
1763 | /* Means the stream was allocated but not successfully added */ | |
1764 | goto free_stream; | |
1765 | } | |
1766 | ||
8994307f DG |
1767 | pthread_mutex_lock(&stream->lock); |
1768 | ||
fb3a43a9 DG |
1769 | pthread_mutex_lock(&consumer_data.lock); |
1770 | switch (consumer_data.type) { | |
1771 | case LTTNG_CONSUMER_KERNEL: | |
1772 | if (stream->mmap_base != NULL) { | |
1773 | ret = munmap(stream->mmap_base, stream->mmap_len); | |
1774 | if (ret != 0) { | |
1775 | PERROR("munmap metadata stream"); | |
1776 | } | |
1777 | } | |
1778 | break; | |
1779 | case LTTNG_CONSUMER32_UST: | |
1780 | case LTTNG_CONSUMER64_UST: | |
1781 | lttng_ustconsumer_del_stream(stream); | |
1782 | break; | |
1783 | default: | |
1784 | ERR("Unknown consumer_data type"); | |
1785 | assert(0); | |
e316aad5 | 1786 | goto end; |
fb3a43a9 | 1787 | } |
fb3a43a9 | 1788 | |
c869f647 | 1789 | rcu_read_lock(); |
58b1f425 | 1790 | iter.iter.node = &stream->node.node; |
c869f647 DG |
1791 | ret = lttng_ht_del(ht, &iter); |
1792 | assert(!ret); | |
ca22feea DG |
1793 | |
1794 | /* Remove node session id from the consumer_data stream ht */ | |
1795 | iter.iter.node = &stream->node_session_id.node; | |
1796 | ret = lttng_ht_del(consumer_data.stream_list_ht, &iter); | |
1797 | assert(!ret); | |
c869f647 DG |
1798 | rcu_read_unlock(); |
1799 | ||
fb3a43a9 DG |
1800 | if (stream->out_fd >= 0) { |
1801 | ret = close(stream->out_fd); | |
1802 | if (ret) { | |
1803 | PERROR("close"); | |
1804 | } | |
1805 | } | |
1806 | ||
1807 | if (stream->wait_fd >= 0 && !stream->wait_fd_is_copy) { | |
1808 | ret = close(stream->wait_fd); | |
1809 | if (ret) { | |
1810 | PERROR("close"); | |
1811 | } | |
1812 | } | |
1813 | ||
1814 | if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) { | |
1815 | ret = close(stream->shm_fd); | |
1816 | if (ret) { | |
1817 | PERROR("close"); | |
1818 | } | |
1819 | } | |
1820 | ||
1821 | /* Check and cleanup relayd */ | |
1822 | rcu_read_lock(); | |
1823 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
1824 | if (relayd != NULL) { | |
1825 | uatomic_dec(&relayd->refcount); | |
1826 | assert(uatomic_read(&relayd->refcount) >= 0); | |
1827 | ||
1828 | /* Closing streams requires to lock the control socket. */ | |
1829 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
1830 | ret = relayd_send_close_stream(&relayd->control_sock, | |
1831 | stream->relayd_stream_id, stream->next_net_seq_num - 1); | |
1832 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
1833 | if (ret < 0) { | |
1834 | DBG("Unable to close stream on the relayd. Continuing"); | |
1835 | /* | |
1836 | * Continue here. There is nothing we can do for the relayd. | |
1837 | * Chances are that the relayd has closed the socket so we just | |
1838 | * continue cleaning up. | |
1839 | */ | |
1840 | } | |
1841 | ||
1842 | /* Both conditions are met, we destroy the relayd. */ | |
1843 | if (uatomic_read(&relayd->refcount) == 0 && | |
1844 | uatomic_read(&relayd->destroy_flag)) { | |
d09e1200 | 1845 | destroy_relayd(relayd); |
fb3a43a9 DG |
1846 | } |
1847 | } | |
1848 | rcu_read_unlock(); | |
1849 | ||
1850 | /* Atomically decrement channel refcount since other threads can use it. */ | |
1851 | uatomic_dec(&stream->chan->refcount); | |
c30aaa51 MD |
1852 | if (!uatomic_read(&stream->chan->refcount) |
1853 | && !uatomic_read(&stream->chan->nb_init_streams)) { | |
1854 | /* Go for channel deletion! */ | |
e316aad5 | 1855 | free_chan = stream->chan; |
fb3a43a9 DG |
1856 | } |
1857 | ||
e316aad5 DG |
1858 | end: |
1859 | pthread_mutex_unlock(&consumer_data.lock); | |
8994307f | 1860 | pthread_mutex_unlock(&stream->lock); |
e316aad5 DG |
1861 | |
1862 | if (free_chan) { | |
1863 | consumer_del_channel(free_chan); | |
1864 | } | |
1865 | ||
1866 | free_stream: | |
58b1f425 | 1867 | call_rcu(&stream->node.head, consumer_free_stream); |
fb3a43a9 DG |
1868 | } |
1869 | ||
1870 | /* | |
1871 | * Action done with the metadata stream when adding it to the consumer internal | |
1872 | * data structures to handle it. | |
1873 | */ | |
e316aad5 DG |
1874 | static int consumer_add_metadata_stream(struct lttng_consumer_stream *stream, |
1875 | struct lttng_ht *ht) | |
fb3a43a9 | 1876 | { |
e316aad5 | 1877 | int ret = 0; |
fb3a43a9 DG |
1878 | struct consumer_relayd_sock_pair *relayd; |
1879 | ||
e316aad5 DG |
1880 | assert(stream); |
1881 | assert(ht); | |
1882 | ||
1883 | DBG3("Adding metadata stream %d to hash table", stream->wait_fd); | |
1884 | ||
1885 | pthread_mutex_lock(&consumer_data.lock); | |
1886 | ||
e316aad5 DG |
1887 | /* |
1888 | * From here, refcounts are updated so be _careful_ when returning an error | |
1889 | * after this point. | |
1890 | */ | |
1891 | ||
fb3a43a9 | 1892 | rcu_read_lock(); |
e316aad5 | 1893 | /* Find relayd and, if one is found, increment refcount. */ |
fb3a43a9 DG |
1894 | relayd = consumer_find_relayd(stream->net_seq_idx); |
1895 | if (relayd != NULL) { | |
1896 | uatomic_inc(&relayd->refcount); | |
1897 | } | |
e316aad5 DG |
1898 | |
1899 | /* Update channel refcount once added without error(s). */ | |
1900 | uatomic_inc(&stream->chan->refcount); | |
1901 | ||
1902 | /* | |
1903 | * When nb_init_streams reaches 0, we don't need to trigger any action in | |
1904 | * terms of destroying the associated channel, because the action that | |
1905 | * causes the count to become 0 also causes a stream to be added. The | |
1906 | * channel deletion will thus be triggered by the following removal of this | |
1907 | * stream. | |
1908 | */ | |
1909 | if (uatomic_read(&stream->chan->nb_init_streams) > 0) { | |
1910 | uatomic_dec(&stream->chan->nb_init_streams); | |
1911 | } | |
1912 | ||
43c34bc3 DG |
1913 | /* Steal stream identifier to avoid having streams with the same key */ |
1914 | consumer_steal_stream_key(stream->key, ht); | |
1915 | ||
58b1f425 | 1916 | lttng_ht_add_unique_ulong(ht, &stream->node); |
ca22feea DG |
1917 | |
1918 | /* | |
1919 | * Add stream to the stream_list_ht of the consumer data. No need to steal | |
1920 | * the key since the HT does not use it and we allow to add redundant keys | |
1921 | * into this table. | |
1922 | */ | |
1923 | lttng_ht_add_ulong(consumer_data.stream_list_ht, &stream->node_session_id); | |
1924 | ||
fb3a43a9 | 1925 | rcu_read_unlock(); |
e316aad5 | 1926 | |
e316aad5 DG |
1927 | pthread_mutex_unlock(&consumer_data.lock); |
1928 | return ret; | |
fb3a43a9 DG |
1929 | } |
1930 | ||
8994307f DG |
1931 | /* |
1932 | * Delete data stream that are flagged for deletion (endpoint_status). | |
1933 | */ | |
1934 | static void validate_endpoint_status_data_stream(void) | |
1935 | { | |
1936 | struct lttng_ht_iter iter; | |
1937 | struct lttng_consumer_stream *stream; | |
1938 | ||
1939 | DBG("Consumer delete flagged data stream"); | |
1940 | ||
1941 | rcu_read_lock(); | |
1942 | cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) { | |
1943 | /* Validate delete flag of the stream */ | |
1944 | if (!stream->endpoint_status) { | |
1945 | continue; | |
1946 | } | |
1947 | /* Delete it right now */ | |
1948 | consumer_del_stream(stream, data_ht); | |
1949 | } | |
1950 | rcu_read_unlock(); | |
1951 | } | |
1952 | ||
1953 | /* | |
1954 | * Delete metadata stream that are flagged for deletion (endpoint_status). | |
1955 | */ | |
1956 | static void validate_endpoint_status_metadata_stream( | |
1957 | struct lttng_poll_event *pollset) | |
1958 | { | |
1959 | struct lttng_ht_iter iter; | |
1960 | struct lttng_consumer_stream *stream; | |
1961 | ||
1962 | DBG("Consumer delete flagged metadata stream"); | |
1963 | ||
1964 | assert(pollset); | |
1965 | ||
1966 | rcu_read_lock(); | |
1967 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) { | |
1968 | /* Validate delete flag of the stream */ | |
1969 | if (!stream->endpoint_status) { | |
1970 | continue; | |
1971 | } | |
1972 | /* | |
1973 | * Remove from pollset so the metadata thread can continue without | |
1974 | * blocking on a deleted stream. | |
1975 | */ | |
1976 | lttng_poll_del(pollset, stream->wait_fd); | |
1977 | ||
1978 | /* Delete it right now */ | |
1979 | consumer_del_metadata_stream(stream, metadata_ht); | |
1980 | } | |
1981 | rcu_read_unlock(); | |
1982 | } | |
1983 | ||
fb3a43a9 DG |
1984 | /* |
1985 | * Thread polls on metadata file descriptor and write them on disk or on the | |
1986 | * network. | |
1987 | */ | |
7d980def | 1988 | void *consumer_thread_metadata_poll(void *data) |
fb3a43a9 DG |
1989 | { |
1990 | int ret, i, pollfd; | |
1991 | uint32_t revents, nb_fd; | |
e316aad5 | 1992 | struct lttng_consumer_stream *stream = NULL; |
fb3a43a9 DG |
1993 | struct lttng_ht_iter iter; |
1994 | struct lttng_ht_node_ulong *node; | |
fb3a43a9 DG |
1995 | struct lttng_poll_event events; |
1996 | struct lttng_consumer_local_data *ctx = data; | |
1997 | ssize_t len; | |
1998 | ||
1999 | rcu_register_thread(); | |
2000 | ||
2001 | DBG("Thread metadata poll started"); | |
2002 | ||
fb3a43a9 DG |
2003 | /* Size is set to 1 for the consumer_metadata pipe */ |
2004 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
2005 | if (ret < 0) { | |
2006 | ERR("Poll set creation failed"); | |
2007 | goto end; | |
2008 | } | |
2009 | ||
2010 | ret = lttng_poll_add(&events, ctx->consumer_metadata_pipe[0], LPOLLIN); | |
2011 | if (ret < 0) { | |
2012 | goto end; | |
2013 | } | |
2014 | ||
2015 | /* Main loop */ | |
2016 | DBG("Metadata main loop started"); | |
2017 | ||
2018 | while (1) { | |
2019 | lttng_poll_reset(&events); | |
2020 | ||
2021 | nb_fd = LTTNG_POLL_GETNB(&events); | |
2022 | ||
2023 | /* Only the metadata pipe is set */ | |
2024 | if (nb_fd == 0 && consumer_quit == 1) { | |
2025 | goto end; | |
2026 | } | |
2027 | ||
2028 | restart: | |
2029 | DBG("Metadata poll wait with %d fd(s)", nb_fd); | |
2030 | ret = lttng_poll_wait(&events, -1); | |
2031 | DBG("Metadata event catched in thread"); | |
2032 | if (ret < 0) { | |
2033 | if (errno == EINTR) { | |
e316aad5 | 2034 | ERR("Poll EINTR catched"); |
fb3a43a9 DG |
2035 | goto restart; |
2036 | } | |
2037 | goto error; | |
2038 | } | |
2039 | ||
e316aad5 | 2040 | /* From here, the event is a metadata wait fd */ |
fb3a43a9 DG |
2041 | for (i = 0; i < nb_fd; i++) { |
2042 | revents = LTTNG_POLL_GETEV(&events, i); | |
2043 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2044 | ||
e316aad5 DG |
2045 | /* Just don't waste time if no returned events for the fd */ |
2046 | if (!revents) { | |
2047 | continue; | |
2048 | } | |
2049 | ||
fb3a43a9 | 2050 | if (pollfd == ctx->consumer_metadata_pipe[0]) { |
4adabd61 | 2051 | if (revents & (LPOLLERR | LPOLLHUP )) { |
fb3a43a9 DG |
2052 | DBG("Metadata thread pipe hung up"); |
2053 | /* | |
2054 | * Remove the pipe from the poll set and continue the loop | |
2055 | * since their might be data to consume. | |
2056 | */ | |
2057 | lttng_poll_del(&events, ctx->consumer_metadata_pipe[0]); | |
2058 | close(ctx->consumer_metadata_pipe[0]); | |
2059 | continue; | |
2060 | } else if (revents & LPOLLIN) { | |
fb3a43a9 | 2061 | do { |
633d0084 DG |
2062 | /* Get the stream pointer received */ |
2063 | ret = read(pollfd, &stream, sizeof(stream)); | |
fb3a43a9 | 2064 | } while (ret < 0 && errno == EINTR); |
633d0084 DG |
2065 | if (ret < 0 || |
2066 | ret < sizeof(struct lttng_consumer_stream *)) { | |
fb3a43a9 | 2067 | PERROR("read metadata stream"); |
fb3a43a9 DG |
2068 | /* |
2069 | * Let's continue here and hope we can still work | |
2070 | * without stopping the consumer. XXX: Should we? | |
2071 | */ | |
2072 | continue; | |
2073 | } | |
2074 | ||
8994307f DG |
2075 | /* A NULL stream means that the state has changed. */ |
2076 | if (stream == NULL) { | |
2077 | /* Check for deleted streams. */ | |
2078 | validate_endpoint_status_metadata_stream(&events); | |
2079 | continue; | |
2080 | } | |
2081 | ||
fb3a43a9 DG |
2082 | DBG("Adding metadata stream %d to poll set", |
2083 | stream->wait_fd); | |
2084 | ||
e316aad5 DG |
2085 | ret = consumer_add_metadata_stream(stream, metadata_ht); |
2086 | if (ret) { | |
2087 | ERR("Unable to add metadata stream"); | |
2088 | /* Stream was not setup properly. Continuing. */ | |
2089 | consumer_del_metadata_stream(stream, NULL); | |
2090 | continue; | |
2091 | } | |
fb3a43a9 DG |
2092 | |
2093 | /* Add metadata stream to the global poll events list */ | |
2094 | lttng_poll_add(&events, stream->wait_fd, | |
2095 | LPOLLIN | LPOLLPRI); | |
fb3a43a9 DG |
2096 | } |
2097 | ||
e316aad5 | 2098 | /* Handle other stream */ |
fb3a43a9 DG |
2099 | continue; |
2100 | } | |
2101 | ||
d09e1200 | 2102 | rcu_read_lock(); |
fb3a43a9 DG |
2103 | lttng_ht_lookup(metadata_ht, (void *)((unsigned long) pollfd), |
2104 | &iter); | |
2105 | node = lttng_ht_iter_get_node_ulong(&iter); | |
e316aad5 | 2106 | assert(node); |
fb3a43a9 DG |
2107 | |
2108 | stream = caa_container_of(node, struct lttng_consumer_stream, | |
58b1f425 | 2109 | node); |
fb3a43a9 | 2110 | |
e316aad5 | 2111 | /* Check for error event */ |
4adabd61 | 2112 | if (revents & (LPOLLERR | LPOLLHUP)) { |
e316aad5 | 2113 | DBG("Metadata fd %d is hup|err.", pollfd); |
fb3a43a9 DG |
2114 | if (!stream->hangup_flush_done |
2115 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
2116 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
2117 | DBG("Attempting to flush and consume the UST buffers"); | |
2118 | lttng_ustconsumer_on_stream_hangup(stream); | |
2119 | ||
2120 | /* We just flushed the stream now read it. */ | |
4bb94b75 DG |
2121 | do { |
2122 | len = ctx->on_buffer_ready(stream, ctx); | |
2123 | /* | |
2124 | * We don't check the return value here since if we get | |
2125 | * a negative len, it means an error occured thus we | |
2126 | * simply remove it from the poll set and free the | |
2127 | * stream. | |
2128 | */ | |
2129 | } while (len > 0); | |
fb3a43a9 DG |
2130 | } |
2131 | ||
fb3a43a9 | 2132 | lttng_poll_del(&events, stream->wait_fd); |
e316aad5 DG |
2133 | /* |
2134 | * This call update the channel states, closes file descriptors | |
2135 | * and securely free the stream. | |
2136 | */ | |
2137 | consumer_del_metadata_stream(stream, metadata_ht); | |
2138 | } else if (revents & (LPOLLIN | LPOLLPRI)) { | |
2139 | /* Get the data out of the metadata file descriptor */ | |
2140 | DBG("Metadata available on fd %d", pollfd); | |
2141 | assert(stream->wait_fd == pollfd); | |
2142 | ||
2143 | len = ctx->on_buffer_ready(stream, ctx); | |
2144 | /* It's ok to have an unavailable sub-buffer */ | |
b64403e3 | 2145 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2146 | /* Clean up stream from consumer and free it. */ |
2147 | lttng_poll_del(&events, stream->wait_fd); | |
2148 | consumer_del_metadata_stream(stream, metadata_ht); | |
e316aad5 DG |
2149 | } else if (len > 0) { |
2150 | stream->data_read = 1; | |
2151 | } | |
fb3a43a9 | 2152 | } |
e316aad5 DG |
2153 | |
2154 | /* Release RCU lock for the stream looked up */ | |
d09e1200 | 2155 | rcu_read_unlock(); |
fb3a43a9 DG |
2156 | } |
2157 | } | |
2158 | ||
2159 | error: | |
2160 | end: | |
2161 | DBG("Metadata poll thread exiting"); | |
2162 | lttng_poll_clean(&events); | |
2163 | ||
2164 | if (metadata_ht) { | |
2165 | destroy_stream_ht(metadata_ht); | |
2166 | } | |
2167 | ||
2168 | rcu_unregister_thread(); | |
2169 | return NULL; | |
2170 | } | |
2171 | ||
3bd1e081 | 2172 | /* |
e4421fec | 2173 | * This thread polls the fds in the set to consume the data and write |
3bd1e081 MD |
2174 | * it to tracefile if necessary. |
2175 | */ | |
7d980def | 2176 | void *consumer_thread_data_poll(void *data) |
3bd1e081 MD |
2177 | { |
2178 | int num_rdy, num_hup, high_prio, ret, i; | |
2179 | struct pollfd *pollfd = NULL; | |
2180 | /* local view of the streams */ | |
c869f647 | 2181 | struct lttng_consumer_stream **local_stream = NULL, *new_stream = NULL; |
3bd1e081 MD |
2182 | /* local view of consumer_data.fds_count */ |
2183 | int nb_fd = 0; | |
3bd1e081 | 2184 | struct lttng_consumer_local_data *ctx = data; |
00e2e675 | 2185 | ssize_t len; |
3bd1e081 | 2186 | |
e7b994a3 DG |
2187 | rcu_register_thread(); |
2188 | ||
43c34bc3 DG |
2189 | data_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2190 | if (data_ht == NULL) { | |
2191 | goto end; | |
2192 | } | |
2193 | ||
effcf122 | 2194 | local_stream = zmalloc(sizeof(struct lttng_consumer_stream)); |
3bd1e081 MD |
2195 | |
2196 | while (1) { | |
2197 | high_prio = 0; | |
2198 | num_hup = 0; | |
2199 | ||
2200 | /* | |
e4421fec | 2201 | * the fds set has been updated, we need to update our |
3bd1e081 MD |
2202 | * local array as well |
2203 | */ | |
2204 | pthread_mutex_lock(&consumer_data.lock); | |
2205 | if (consumer_data.need_update) { | |
2206 | if (pollfd != NULL) { | |
2207 | free(pollfd); | |
2208 | pollfd = NULL; | |
2209 | } | |
2210 | if (local_stream != NULL) { | |
2211 | free(local_stream); | |
2212 | local_stream = NULL; | |
2213 | } | |
2214 | ||
50f8ae69 | 2215 | /* allocate for all fds + 1 for the consumer_data_pipe */ |
effcf122 | 2216 | pollfd = zmalloc((consumer_data.stream_count + 1) * sizeof(struct pollfd)); |
3bd1e081 | 2217 | if (pollfd == NULL) { |
7a57cf92 | 2218 | PERROR("pollfd malloc"); |
3bd1e081 MD |
2219 | pthread_mutex_unlock(&consumer_data.lock); |
2220 | goto end; | |
2221 | } | |
2222 | ||
50f8ae69 | 2223 | /* allocate for all fds + 1 for the consumer_data_pipe */ |
effcf122 | 2224 | local_stream = zmalloc((consumer_data.stream_count + 1) * |
3bd1e081 MD |
2225 | sizeof(struct lttng_consumer_stream)); |
2226 | if (local_stream == NULL) { | |
7a57cf92 | 2227 | PERROR("local_stream malloc"); |
3bd1e081 MD |
2228 | pthread_mutex_unlock(&consumer_data.lock); |
2229 | goto end; | |
2230 | } | |
43c34bc3 DG |
2231 | ret = consumer_update_poll_array(ctx, &pollfd, local_stream, |
2232 | data_ht); | |
3bd1e081 MD |
2233 | if (ret < 0) { |
2234 | ERR("Error in allocating pollfd or local_outfds"); | |
f73fabfd | 2235 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
2236 | pthread_mutex_unlock(&consumer_data.lock); |
2237 | goto end; | |
2238 | } | |
2239 | nb_fd = ret; | |
2240 | consumer_data.need_update = 0; | |
2241 | } | |
2242 | pthread_mutex_unlock(&consumer_data.lock); | |
2243 | ||
4078b776 MD |
2244 | /* No FDs and consumer_quit, consumer_cleanup the thread */ |
2245 | if (nb_fd == 0 && consumer_quit == 1) { | |
2246 | goto end; | |
2247 | } | |
3bd1e081 | 2248 | /* poll on the array of fds */ |
88f2b785 | 2249 | restart: |
3bd1e081 MD |
2250 | DBG("polling on %d fd", nb_fd + 1); |
2251 | num_rdy = poll(pollfd, nb_fd + 1, consumer_poll_timeout); | |
2252 | DBG("poll num_rdy : %d", num_rdy); | |
2253 | if (num_rdy == -1) { | |
88f2b785 MD |
2254 | /* |
2255 | * Restart interrupted system call. | |
2256 | */ | |
2257 | if (errno == EINTR) { | |
2258 | goto restart; | |
2259 | } | |
7a57cf92 | 2260 | PERROR("Poll error"); |
f73fabfd | 2261 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); |
3bd1e081 MD |
2262 | goto end; |
2263 | } else if (num_rdy == 0) { | |
2264 | DBG("Polling thread timed out"); | |
2265 | goto end; | |
2266 | } | |
2267 | ||
3bd1e081 | 2268 | /* |
50f8ae69 | 2269 | * If the consumer_data_pipe triggered poll go directly to the |
00e2e675 DG |
2270 | * beginning of the loop to update the array. We want to prioritize |
2271 | * array update over low-priority reads. | |
3bd1e081 | 2272 | */ |
509bb1cf | 2273 | if (pollfd[nb_fd].revents & (POLLIN | POLLPRI)) { |
04fdd819 | 2274 | size_t pipe_readlen; |
04fdd819 | 2275 | |
50f8ae69 | 2276 | DBG("consumer_data_pipe wake up"); |
04fdd819 MD |
2277 | /* Consume 1 byte of pipe data */ |
2278 | do { | |
50f8ae69 | 2279 | pipe_readlen = read(ctx->consumer_data_pipe[0], &new_stream, |
c869f647 | 2280 | sizeof(new_stream)); |
04fdd819 | 2281 | } while (pipe_readlen == -1 && errno == EINTR); |
c869f647 DG |
2282 | |
2283 | /* | |
2284 | * If the stream is NULL, just ignore it. It's also possible that | |
2285 | * the sessiond poll thread changed the consumer_quit state and is | |
2286 | * waking us up to test it. | |
2287 | */ | |
2288 | if (new_stream == NULL) { | |
8994307f | 2289 | validate_endpoint_status_data_stream(); |
c869f647 DG |
2290 | continue; |
2291 | } | |
2292 | ||
43c34bc3 | 2293 | ret = consumer_add_stream(new_stream, data_ht); |
c869f647 DG |
2294 | if (ret) { |
2295 | ERR("Consumer add stream %d failed. Continuing", | |
2296 | new_stream->key); | |
2297 | /* | |
2298 | * At this point, if the add_stream fails, it is not in the | |
2299 | * hash table thus passing the NULL value here. | |
2300 | */ | |
2301 | consumer_del_stream(new_stream, NULL); | |
2302 | } | |
2303 | ||
2304 | /* Continue to update the local streams and handle prio ones */ | |
3bd1e081 MD |
2305 | continue; |
2306 | } | |
2307 | ||
2308 | /* Take care of high priority channels first. */ | |
2309 | for (i = 0; i < nb_fd; i++) { | |
fb3a43a9 | 2310 | if (pollfd[i].revents & POLLPRI) { |
d41f73b7 MD |
2311 | DBG("Urgent read on fd %d", pollfd[i].fd); |
2312 | high_prio = 1; | |
4078b776 | 2313 | len = ctx->on_buffer_ready(local_stream[i], ctx); |
d41f73b7 | 2314 | /* it's ok to have an unavailable sub-buffer */ |
b64403e3 | 2315 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2316 | /* Clean the stream and free it. */ |
2317 | consumer_del_stream(local_stream[i], data_ht); | |
4078b776 MD |
2318 | } else if (len > 0) { |
2319 | local_stream[i]->data_read = 1; | |
d41f73b7 | 2320 | } |
3bd1e081 MD |
2321 | } |
2322 | } | |
2323 | ||
4078b776 MD |
2324 | /* |
2325 | * If we read high prio channel in this loop, try again | |
2326 | * for more high prio data. | |
2327 | */ | |
2328 | if (high_prio) { | |
3bd1e081 MD |
2329 | continue; |
2330 | } | |
2331 | ||
2332 | /* Take care of low priority channels. */ | |
4078b776 MD |
2333 | for (i = 0; i < nb_fd; i++) { |
2334 | if ((pollfd[i].revents & POLLIN) || | |
2335 | local_stream[i]->hangup_flush_done) { | |
4078b776 MD |
2336 | DBG("Normal read on fd %d", pollfd[i].fd); |
2337 | len = ctx->on_buffer_ready(local_stream[i], ctx); | |
2338 | /* it's ok to have an unavailable sub-buffer */ | |
b64403e3 | 2339 | if (len < 0 && len != -EAGAIN && len != -ENODATA) { |
ab1027f4 DG |
2340 | /* Clean the stream and free it. */ |
2341 | consumer_del_stream(local_stream[i], data_ht); | |
4078b776 MD |
2342 | } else if (len > 0) { |
2343 | local_stream[i]->data_read = 1; | |
2344 | } | |
2345 | } | |
2346 | } | |
2347 | ||
2348 | /* Handle hangup and errors */ | |
2349 | for (i = 0; i < nb_fd; i++) { | |
2350 | if (!local_stream[i]->hangup_flush_done | |
2351 | && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL)) | |
2352 | && (consumer_data.type == LTTNG_CONSUMER32_UST | |
2353 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { | |
2354 | DBG("fd %d is hup|err|nval. Attempting flush and read.", | |
2355 | pollfd[i].fd); | |
2356 | lttng_ustconsumer_on_stream_hangup(local_stream[i]); | |
2357 | /* Attempt read again, for the data we just flushed. */ | |
2358 | local_stream[i]->data_read = 1; | |
2359 | } | |
2360 | /* | |
2361 | * If the poll flag is HUP/ERR/NVAL and we have | |
2362 | * read no data in this pass, we can remove the | |
2363 | * stream from its hash table. | |
2364 | */ | |
2365 | if ((pollfd[i].revents & POLLHUP)) { | |
2366 | DBG("Polling fd %d tells it has hung up.", pollfd[i].fd); | |
2367 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2368 | consumer_del_stream(local_stream[i], data_ht); |
4078b776 MD |
2369 | num_hup++; |
2370 | } | |
2371 | } else if (pollfd[i].revents & POLLERR) { | |
2372 | ERR("Error returned in polling fd %d.", pollfd[i].fd); | |
2373 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2374 | consumer_del_stream(local_stream[i], data_ht); |
4078b776 MD |
2375 | num_hup++; |
2376 | } | |
2377 | } else if (pollfd[i].revents & POLLNVAL) { | |
2378 | ERR("Polling fd %d tells fd is not open.", pollfd[i].fd); | |
2379 | if (!local_stream[i]->data_read) { | |
43c34bc3 | 2380 | consumer_del_stream(local_stream[i], data_ht); |
4078b776 | 2381 | num_hup++; |
3bd1e081 MD |
2382 | } |
2383 | } | |
4078b776 | 2384 | local_stream[i]->data_read = 0; |
3bd1e081 MD |
2385 | } |
2386 | } | |
2387 | end: | |
2388 | DBG("polling thread exiting"); | |
2389 | if (pollfd != NULL) { | |
2390 | free(pollfd); | |
2391 | pollfd = NULL; | |
2392 | } | |
2393 | if (local_stream != NULL) { | |
2394 | free(local_stream); | |
2395 | local_stream = NULL; | |
2396 | } | |
fb3a43a9 DG |
2397 | |
2398 | /* | |
2399 | * Close the write side of the pipe so epoll_wait() in | |
7d980def DG |
2400 | * consumer_thread_metadata_poll can catch it. The thread is monitoring the |
2401 | * read side of the pipe. If we close them both, epoll_wait strangely does | |
2402 | * not return and could create a endless wait period if the pipe is the | |
2403 | * only tracked fd in the poll set. The thread will take care of closing | |
2404 | * the read side. | |
fb3a43a9 DG |
2405 | */ |
2406 | close(ctx->consumer_metadata_pipe[1]); | |
fb3a43a9 | 2407 | |
43c34bc3 DG |
2408 | if (data_ht) { |
2409 | destroy_data_stream_ht(data_ht); | |
2410 | } | |
2411 | ||
e7b994a3 | 2412 | rcu_unregister_thread(); |
3bd1e081 MD |
2413 | return NULL; |
2414 | } | |
2415 | ||
2416 | /* | |
2417 | * This thread listens on the consumerd socket and receives the file | |
2418 | * descriptors from the session daemon. | |
2419 | */ | |
7d980def | 2420 | void *consumer_thread_sessiond_poll(void *data) |
3bd1e081 MD |
2421 | { |
2422 | int sock, client_socket, ret; | |
2423 | /* | |
2424 | * structure to poll for incoming data on communication socket avoids | |
2425 | * making blocking sockets. | |
2426 | */ | |
2427 | struct pollfd consumer_sockpoll[2]; | |
2428 | struct lttng_consumer_local_data *ctx = data; | |
2429 | ||
e7b994a3 DG |
2430 | rcu_register_thread(); |
2431 | ||
3bd1e081 MD |
2432 | DBG("Creating command socket %s", ctx->consumer_command_sock_path); |
2433 | unlink(ctx->consumer_command_sock_path); | |
2434 | client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path); | |
2435 | if (client_socket < 0) { | |
2436 | ERR("Cannot create command socket"); | |
2437 | goto end; | |
2438 | } | |
2439 | ||
2440 | ret = lttcomm_listen_unix_sock(client_socket); | |
2441 | if (ret < 0) { | |
2442 | goto end; | |
2443 | } | |
2444 | ||
32258573 | 2445 | DBG("Sending ready command to lttng-sessiond"); |
f73fabfd | 2446 | ret = lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_COMMAND_SOCK_READY); |
3bd1e081 MD |
2447 | /* return < 0 on error, but == 0 is not fatal */ |
2448 | if (ret < 0) { | |
32258573 | 2449 | ERR("Error sending ready command to lttng-sessiond"); |
3bd1e081 MD |
2450 | goto end; |
2451 | } | |
2452 | ||
2453 | ret = fcntl(client_socket, F_SETFL, O_NONBLOCK); | |
2454 | if (ret < 0) { | |
7a57cf92 | 2455 | PERROR("fcntl O_NONBLOCK"); |
3bd1e081 MD |
2456 | goto end; |
2457 | } | |
2458 | ||
2459 | /* prepare the FDs to poll : to client socket and the should_quit pipe */ | |
2460 | consumer_sockpoll[0].fd = ctx->consumer_should_quit[0]; | |
2461 | consumer_sockpoll[0].events = POLLIN | POLLPRI; | |
2462 | consumer_sockpoll[1].fd = client_socket; | |
2463 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
2464 | ||
2465 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2466 | goto end; | |
2467 | } | |
2468 | DBG("Connection on client_socket"); | |
2469 | ||
2470 | /* Blocking call, waiting for transmission */ | |
2471 | sock = lttcomm_accept_unix_sock(client_socket); | |
2472 | if (sock <= 0) { | |
2473 | WARN("On accept"); | |
2474 | goto end; | |
2475 | } | |
2476 | ret = fcntl(sock, F_SETFL, O_NONBLOCK); | |
2477 | if (ret < 0) { | |
7a57cf92 | 2478 | PERROR("fcntl O_NONBLOCK"); |
3bd1e081 MD |
2479 | goto end; |
2480 | } | |
2481 | ||
2482 | /* update the polling structure to poll on the established socket */ | |
2483 | consumer_sockpoll[1].fd = sock; | |
2484 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
2485 | ||
2486 | while (1) { | |
2487 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2488 | goto end; | |
2489 | } | |
2490 | DBG("Incoming command on sock"); | |
2491 | ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
2492 | if (ret == -ENOENT) { | |
2493 | DBG("Received STOP command"); | |
2494 | goto end; | |
2495 | } | |
4cbc1a04 DG |
2496 | if (ret <= 0) { |
2497 | /* | |
2498 | * This could simply be a session daemon quitting. Don't output | |
2499 | * ERR() here. | |
2500 | */ | |
2501 | DBG("Communication interrupted on command socket"); | |
3bd1e081 MD |
2502 | goto end; |
2503 | } | |
2504 | if (consumer_quit) { | |
2505 | DBG("consumer_thread_receive_fds received quit from signal"); | |
2506 | goto end; | |
2507 | } | |
2508 | DBG("received fds on sock"); | |
2509 | } | |
2510 | end: | |
2511 | DBG("consumer_thread_receive_fds exiting"); | |
2512 | ||
2513 | /* | |
2514 | * when all fds have hung up, the polling thread | |
2515 | * can exit cleanly | |
2516 | */ | |
2517 | consumer_quit = 1; | |
2518 | ||
2519 | /* | |
2520 | * 2s of grace period, if no polling events occur during | |
2521 | * this period, the polling thread will exit even if there | |
2522 | * are still open FDs (should not happen, but safety mechanism). | |
2523 | */ | |
2524 | consumer_poll_timeout = LTTNG_CONSUMER_POLL_TIMEOUT; | |
2525 | ||
04fdd819 | 2526 | /* |
c869f647 | 2527 | * Notify the data poll thread to poll back again and test the |
8994307f | 2528 | * consumer_quit state that we just set so to quit gracefully. |
04fdd819 | 2529 | */ |
8994307f | 2530 | notify_thread_pipe(ctx->consumer_data_pipe[1]); |
c869f647 | 2531 | |
e7b994a3 | 2532 | rcu_unregister_thread(); |
3bd1e081 MD |
2533 | return NULL; |
2534 | } | |
d41f73b7 | 2535 | |
4078b776 | 2536 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
2537 | struct lttng_consumer_local_data *ctx) |
2538 | { | |
2539 | switch (consumer_data.type) { | |
2540 | case LTTNG_CONSUMER_KERNEL: | |
2541 | return lttng_kconsumer_read_subbuffer(stream, ctx); | |
7753dea8 MD |
2542 | case LTTNG_CONSUMER32_UST: |
2543 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
2544 | return lttng_ustconsumer_read_subbuffer(stream, ctx); |
2545 | default: | |
2546 | ERR("Unknown consumer_data type"); | |
2547 | assert(0); | |
2548 | return -ENOSYS; | |
2549 | } | |
2550 | } | |
2551 | ||
2552 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
2553 | { | |
2554 | switch (consumer_data.type) { | |
2555 | case LTTNG_CONSUMER_KERNEL: | |
2556 | return lttng_kconsumer_on_recv_stream(stream); | |
7753dea8 MD |
2557 | case LTTNG_CONSUMER32_UST: |
2558 | case LTTNG_CONSUMER64_UST: | |
d41f73b7 MD |
2559 | return lttng_ustconsumer_on_recv_stream(stream); |
2560 | default: | |
2561 | ERR("Unknown consumer_data type"); | |
2562 | assert(0); | |
2563 | return -ENOSYS; | |
2564 | } | |
2565 | } | |
e4421fec DG |
2566 | |
2567 | /* | |
2568 | * Allocate and set consumer data hash tables. | |
2569 | */ | |
2570 | void lttng_consumer_init(void) | |
2571 | { | |
e4421fec | 2572 | consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
00e2e675 | 2573 | consumer_data.relayd_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
53632229 | 2574 | consumer_data.stream_list_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
43c34bc3 DG |
2575 | |
2576 | metadata_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
2577 | assert(metadata_ht); | |
2578 | data_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
2579 | assert(data_ht); | |
e4421fec | 2580 | } |
7735ef9e DG |
2581 | |
2582 | /* | |
2583 | * Process the ADD_RELAYD command receive by a consumer. | |
2584 | * | |
2585 | * This will create a relayd socket pair and add it to the relayd hash table. | |
2586 | * The caller MUST acquire a RCU read side lock before calling it. | |
2587 | */ | |
2588 | int consumer_add_relayd_socket(int net_seq_idx, int sock_type, | |
2589 | struct lttng_consumer_local_data *ctx, int sock, | |
2590 | struct pollfd *consumer_sockpoll, struct lttcomm_sock *relayd_sock) | |
2591 | { | |
2592 | int fd, ret = -1; | |
2593 | struct consumer_relayd_sock_pair *relayd; | |
2594 | ||
2595 | DBG("Consumer adding relayd socket (idx: %d)", net_seq_idx); | |
2596 | ||
2597 | /* Get relayd reference if exists. */ | |
2598 | relayd = consumer_find_relayd(net_seq_idx); | |
2599 | if (relayd == NULL) { | |
2600 | /* Not found. Allocate one. */ | |
2601 | relayd = consumer_allocate_relayd_sock_pair(net_seq_idx); | |
2602 | if (relayd == NULL) { | |
f73fabfd | 2603 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
7735ef9e DG |
2604 | goto error; |
2605 | } | |
2606 | } | |
2607 | ||
2608 | /* Poll on consumer socket. */ | |
2609 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
2610 | ret = -EINTR; | |
2611 | goto error; | |
2612 | } | |
2613 | ||
2614 | /* Get relayd socket from session daemon */ | |
2615 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); | |
2616 | if (ret != sizeof(fd)) { | |
f73fabfd | 2617 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
7735ef9e DG |
2618 | ret = -1; |
2619 | goto error; | |
2620 | } | |
2621 | ||
2622 | /* Copy socket information and received FD */ | |
2623 | switch (sock_type) { | |
2624 | case LTTNG_STREAM_CONTROL: | |
2625 | /* Copy received lttcomm socket */ | |
2626 | lttcomm_copy_sock(&relayd->control_sock, relayd_sock); | |
2627 | ret = lttcomm_create_sock(&relayd->control_sock); | |
2628 | if (ret < 0) { | |
2629 | goto error; | |
2630 | } | |
2631 | ||
2632 | /* Close the created socket fd which is useless */ | |
2633 | close(relayd->control_sock.fd); | |
2634 | ||
2635 | /* Assign new file descriptor */ | |
2636 | relayd->control_sock.fd = fd; | |
2637 | break; | |
2638 | case LTTNG_STREAM_DATA: | |
2639 | /* Copy received lttcomm socket */ | |
2640 | lttcomm_copy_sock(&relayd->data_sock, relayd_sock); | |
2641 | ret = lttcomm_create_sock(&relayd->data_sock); | |
2642 | if (ret < 0) { | |
2643 | goto error; | |
2644 | } | |
2645 | ||
2646 | /* Close the created socket fd which is useless */ | |
2647 | close(relayd->data_sock.fd); | |
2648 | ||
2649 | /* Assign new file descriptor */ | |
2650 | relayd->data_sock.fd = fd; | |
2651 | break; | |
2652 | default: | |
2653 | ERR("Unknown relayd socket type (%d)", sock_type); | |
2654 | goto error; | |
2655 | } | |
2656 | ||
2657 | DBG("Consumer %s socket created successfully with net idx %d (fd: %d)", | |
2658 | sock_type == LTTNG_STREAM_CONTROL ? "control" : "data", | |
2659 | relayd->net_seq_idx, fd); | |
2660 | ||
2661 | /* | |
2662 | * Add relayd socket pair to consumer data hashtable. If object already | |
2663 | * exists or on error, the function gracefully returns. | |
2664 | */ | |
d09e1200 | 2665 | add_relayd(relayd); |
7735ef9e DG |
2666 | |
2667 | /* All good! */ | |
2668 | ret = 0; | |
2669 | ||
2670 | error: | |
2671 | return ret; | |
2672 | } | |
ca22feea | 2673 | |
4e9a4686 DG |
2674 | /* |
2675 | * Try to lock the stream mutex. | |
2676 | * | |
2677 | * On success, 1 is returned else 0 indicating that the mutex is NOT lock. | |
2678 | */ | |
2679 | static int stream_try_lock(struct lttng_consumer_stream *stream) | |
2680 | { | |
2681 | int ret; | |
2682 | ||
2683 | assert(stream); | |
2684 | ||
2685 | /* | |
2686 | * Try to lock the stream mutex. On failure, we know that the stream is | |
2687 | * being used else where hence there is data still being extracted. | |
2688 | */ | |
2689 | ret = pthread_mutex_trylock(&stream->lock); | |
2690 | if (ret) { | |
2691 | /* For both EBUSY and EINVAL error, the mutex is NOT locked. */ | |
2692 | ret = 0; | |
2693 | goto end; | |
2694 | } | |
2695 | ||
2696 | ret = 1; | |
2697 | ||
2698 | end: | |
2699 | return ret; | |
2700 | } | |
2701 | ||
ca22feea DG |
2702 | /* |
2703 | * Check if for a given session id there is still data needed to be extract | |
2704 | * from the buffers. | |
2705 | * | |
2706 | * Return 1 if data is in fact available to be read or else 0. | |
2707 | */ | |
2708 | int consumer_data_available(uint64_t id) | |
2709 | { | |
2710 | int ret; | |
2711 | struct lttng_ht_iter iter; | |
2712 | struct lttng_ht *ht; | |
2713 | struct lttng_consumer_stream *stream; | |
c8f59ee5 | 2714 | struct consumer_relayd_sock_pair *relayd; |
ca22feea DG |
2715 | int (*data_available)(struct lttng_consumer_stream *); |
2716 | ||
2717 | DBG("Consumer data available command on session id %" PRIu64, id); | |
2718 | ||
6f6eda74 | 2719 | rcu_read_lock(); |
ca22feea DG |
2720 | pthread_mutex_lock(&consumer_data.lock); |
2721 | ||
2722 | switch (consumer_data.type) { | |
2723 | case LTTNG_CONSUMER_KERNEL: | |
2724 | data_available = lttng_kconsumer_data_available; | |
2725 | break; | |
2726 | case LTTNG_CONSUMER32_UST: | |
2727 | case LTTNG_CONSUMER64_UST: | |
2728 | data_available = lttng_ustconsumer_data_available; | |
2729 | break; | |
2730 | default: | |
2731 | ERR("Unknown consumer data type"); | |
2732 | assert(0); | |
2733 | } | |
2734 | ||
2735 | /* Ease our life a bit */ | |
2736 | ht = consumer_data.stream_list_ht; | |
2737 | ||
c8f59ee5 DG |
2738 | cds_lfht_for_each_entry_duplicate(ht->ht, |
2739 | ht->hash_fct((void *)((unsigned long) id), 0x42UL), | |
ca22feea DG |
2740 | ht->match_fct, (void *)((unsigned long) id), |
2741 | &iter.iter, stream, node_session_id.node) { | |
4e9a4686 DG |
2742 | /* If this call fails, the stream is being used hence data pending. */ |
2743 | ret = stream_try_lock(stream); | |
2744 | if (!ret) { | |
ca22feea DG |
2745 | goto data_not_available; |
2746 | } | |
ca22feea | 2747 | |
4e9a4686 DG |
2748 | /* |
2749 | * A removed node from the hash table indicates that the stream has | |
2750 | * been deleted thus having a guarantee that the buffers are closed | |
2751 | * on the consumer side. However, data can still be transmitted | |
2752 | * over the network so don't skip the relayd check. | |
2753 | */ | |
2754 | ret = cds_lfht_is_node_deleted(&stream->node.node); | |
2755 | if (!ret) { | |
2756 | /* Check the stream if there is data in the buffers. */ | |
2757 | ret = data_available(stream); | |
2758 | if (ret == 0) { | |
2759 | pthread_mutex_unlock(&stream->lock); | |
2760 | goto data_not_available; | |
2761 | } | |
2762 | } | |
2763 | ||
2764 | /* Relayd check */ | |
c8f59ee5 DG |
2765 | if (stream->net_seq_idx != -1) { |
2766 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
4e9a4686 DG |
2767 | if (!relayd) { |
2768 | /* | |
2769 | * At this point, if the relayd object is not available for the | |
2770 | * given stream, it is because the relayd is being cleaned up | |
2771 | * so every stream associated with it (for a session id value) | |
2772 | * are or will be marked for deletion hence no data pending. | |
2773 | */ | |
2774 | pthread_mutex_unlock(&stream->lock); | |
2775 | goto data_not_available; | |
2776 | } | |
c8f59ee5 | 2777 | |
c8f59ee5 DG |
2778 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); |
2779 | if (stream->metadata_flag) { | |
2780 | ret = relayd_quiescent_control(&relayd->control_sock); | |
2781 | } else { | |
2782 | ret = relayd_data_available(&relayd->control_sock, | |
2783 | stream->relayd_stream_id, stream->next_net_seq_num); | |
2784 | } | |
2785 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
c8f59ee5 | 2786 | if (ret == 0) { |
4e9a4686 | 2787 | pthread_mutex_unlock(&stream->lock); |
c8f59ee5 DG |
2788 | goto data_not_available; |
2789 | } | |
2790 | } | |
4e9a4686 | 2791 | pthread_mutex_unlock(&stream->lock); |
c8f59ee5 | 2792 | } |
ca22feea DG |
2793 | |
2794 | /* | |
2795 | * Finding _no_ node in the hash table means that the stream(s) have been | |
2796 | * removed thus data is guaranteed to be available for analysis from the | |
2797 | * trace files. This is *only* true for local consumer and not network | |
2798 | * streaming. | |
2799 | */ | |
2800 | ||
2801 | /* Data is available to be read by a viewer. */ | |
2802 | pthread_mutex_unlock(&consumer_data.lock); | |
c8f59ee5 | 2803 | rcu_read_unlock(); |
ca22feea DG |
2804 | return 1; |
2805 | ||
2806 | data_not_available: | |
2807 | /* Data is still being extracted from buffers. */ | |
2808 | pthread_mutex_unlock(&consumer_data.lock); | |
c8f59ee5 | 2809 | rcu_read_unlock(); |
ca22feea DG |
2810 | return 0; |
2811 | } |