Commit | Line | Data |
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3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * | |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
3bd1e081 MD |
8 | * |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
3bd1e081 MD |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <assert.h> | |
f02e1e8a | 21 | #include <lttng/ust-ctl.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> | |
dbb5dfe6 | 28 | #include <sys/stat.h> |
3bd1e081 | 29 | #include <sys/types.h> |
77c7c900 | 30 | #include <inttypes.h> |
3bd1e081 | 31 | #include <unistd.h> |
ffe60014 | 32 | #include <urcu/list.h> |
0857097f | 33 | |
990570ed | 34 | #include <common/common.h> |
10a8a223 | 35 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 36 | #include <common/relayd/relayd.h> |
dbb5dfe6 | 37 | #include <common/compat/fcntl.h> |
10a8a223 DG |
38 | |
39 | #include "ust-consumer.h" | |
3bd1e081 MD |
40 | |
41 | extern struct lttng_consumer_global_data consumer_data; | |
42 | extern int consumer_poll_timeout; | |
43 | extern volatile int consumer_quit; | |
44 | ||
45 | /* | |
ffe60014 DG |
46 | * Free channel object and all streams associated with it. This MUST be used |
47 | * only and only if the channel has _NEVER_ been added to the global channel | |
48 | * hash table. | |
3bd1e081 | 49 | */ |
ffe60014 | 50 | static void destroy_channel(struct lttng_consumer_channel *channel) |
3bd1e081 | 51 | { |
ffe60014 DG |
52 | struct lttng_consumer_stream *stream, *stmp; |
53 | ||
54 | assert(channel); | |
55 | ||
56 | DBG("UST consumer cleaning stream list"); | |
57 | ||
58 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
59 | send_node) { | |
60 | cds_list_del(&stream->send_node); | |
61 | ustctl_destroy_stream(stream->ustream); | |
62 | free(stream); | |
63 | } | |
64 | ||
65 | /* | |
66 | * If a channel is available meaning that was created before the streams | |
67 | * were, delete it. | |
68 | */ | |
69 | if (channel->uchan) { | |
70 | lttng_ustconsumer_del_channel(channel); | |
71 | } | |
72 | free(channel); | |
73 | } | |
3bd1e081 MD |
74 | |
75 | /* | |
ffe60014 | 76 | * Add channel to internal consumer state. |
3bd1e081 | 77 | * |
ffe60014 | 78 | * Returns 0 on success or else a negative value. |
3bd1e081 | 79 | */ |
ffe60014 DG |
80 | static int add_channel(struct lttng_consumer_channel *channel, |
81 | struct lttng_consumer_local_data *ctx) | |
3bd1e081 MD |
82 | { |
83 | int ret = 0; | |
84 | ||
ffe60014 DG |
85 | assert(channel); |
86 | assert(ctx); | |
87 | ||
88 | if (ctx->on_recv_channel != NULL) { | |
89 | ret = ctx->on_recv_channel(channel); | |
90 | if (ret == 0) { | |
d8ef542d | 91 | ret = consumer_add_channel(channel, ctx); |
ffe60014 DG |
92 | } else if (ret < 0) { |
93 | /* Most likely an ENOMEM. */ | |
94 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
95 | goto error; | |
96 | } | |
97 | } else { | |
d8ef542d | 98 | ret = consumer_add_channel(channel, ctx); |
3bd1e081 MD |
99 | } |
100 | ||
d88aee68 | 101 | DBG("UST consumer channel added (key: %" PRIu64 ")", channel->key); |
ffe60014 DG |
102 | |
103 | error: | |
3bd1e081 MD |
104 | return ret; |
105 | } | |
106 | ||
107 | /* | |
ffe60014 DG |
108 | * Allocate and return a consumer channel object. |
109 | */ | |
110 | static struct lttng_consumer_channel *allocate_channel(uint64_t session_id, | |
111 | const char *pathname, const char *name, uid_t uid, gid_t gid, | |
d88aee68 | 112 | int relayd_id, uint64_t key, enum lttng_event_output output) |
ffe60014 DG |
113 | { |
114 | assert(pathname); | |
115 | assert(name); | |
116 | ||
117 | return consumer_allocate_channel(key, session_id, pathname, name, uid, gid, | |
118 | relayd_id, output); | |
119 | } | |
120 | ||
121 | /* | |
122 | * Allocate and return a consumer stream object. If _alloc_ret is not NULL, the | |
123 | * error value if applicable is set in it else it is kept untouched. | |
3bd1e081 | 124 | * |
ffe60014 | 125 | * Return NULL on error else the newly allocated stream object. |
3bd1e081 | 126 | */ |
ffe60014 DG |
127 | static struct lttng_consumer_stream *allocate_stream(int cpu, int key, |
128 | struct lttng_consumer_channel *channel, | |
129 | struct lttng_consumer_local_data *ctx, int *_alloc_ret) | |
130 | { | |
131 | int alloc_ret; | |
132 | struct lttng_consumer_stream *stream = NULL; | |
133 | ||
134 | assert(channel); | |
135 | assert(ctx); | |
136 | ||
137 | stream = consumer_allocate_stream(channel->key, | |
138 | key, | |
139 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
140 | channel->name, | |
141 | channel->uid, | |
142 | channel->gid, | |
143 | channel->relayd_id, | |
144 | channel->session_id, | |
145 | cpu, | |
146 | &alloc_ret, | |
147 | channel->type); | |
148 | if (stream == NULL) { | |
149 | switch (alloc_ret) { | |
150 | case -ENOENT: | |
151 | /* | |
152 | * We could not find the channel. Can happen if cpu hotplug | |
153 | * happens while tearing down. | |
154 | */ | |
155 | DBG3("Could not find channel"); | |
156 | break; | |
157 | case -ENOMEM: | |
158 | case -EINVAL: | |
159 | default: | |
160 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
161 | break; | |
162 | } | |
163 | goto error; | |
164 | } | |
165 | ||
166 | stream->chan = channel; | |
167 | ||
168 | error: | |
169 | if (_alloc_ret) { | |
170 | *_alloc_ret = alloc_ret; | |
171 | } | |
172 | return stream; | |
173 | } | |
174 | ||
175 | /* | |
176 | * Send the given stream pointer to the corresponding thread. | |
177 | * | |
178 | * Returns 0 on success else a negative value. | |
179 | */ | |
180 | static int send_stream_to_thread(struct lttng_consumer_stream *stream, | |
181 | struct lttng_consumer_local_data *ctx) | |
182 | { | |
183 | int ret, stream_pipe; | |
184 | ||
185 | /* Get the right pipe where the stream will be sent. */ | |
186 | if (stream->metadata_flag) { | |
187 | stream_pipe = ctx->consumer_metadata_pipe[1]; | |
188 | } else { | |
189 | stream_pipe = ctx->consumer_data_pipe[1]; | |
190 | } | |
191 | ||
192 | do { | |
193 | ret = write(stream_pipe, &stream, sizeof(stream)); | |
194 | } while (ret < 0 && errno == EINTR); | |
195 | if (ret < 0) { | |
196 | PERROR("Consumer write %s stream to pipe %d", | |
197 | stream->metadata_flag ? "metadata" : "data", stream_pipe); | |
198 | } | |
199 | ||
200 | return ret; | |
201 | } | |
202 | ||
203 | /* | |
204 | * Search for a relayd object related to the stream. If found, send the stream | |
205 | * to the relayd. | |
206 | * | |
207 | * On success, returns 0 else a negative value. | |
208 | */ | |
209 | static int send_stream_to_relayd(struct lttng_consumer_stream *stream) | |
210 | { | |
211 | int ret = 0; | |
212 | struct consumer_relayd_sock_pair *relayd; | |
213 | ||
214 | assert(stream); | |
215 | ||
216 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
217 | if (relayd != NULL) { | |
218 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
219 | /* Add stream on the relayd */ | |
220 | ret = relayd_add_stream(&relayd->control_sock, stream->name, | |
221 | stream->chan->pathname, &stream->relayd_stream_id); | |
222 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
223 | if (ret < 0) { | |
224 | goto error; | |
225 | } | |
d88aee68 DG |
226 | } else if (stream->net_seq_idx != (uint64_t) -1ULL) { |
227 | ERR("Network sequence index %" PRIu64 " unknown. Not adding stream.", | |
ffe60014 DG |
228 | stream->net_seq_idx); |
229 | ret = -1; | |
230 | goto error; | |
231 | } | |
232 | ||
233 | error: | |
234 | return ret; | |
235 | } | |
236 | ||
d88aee68 DG |
237 | /* |
238 | * Create streams for the given channel using liblttng-ust-ctl. | |
239 | * | |
240 | * Return 0 on success else a negative value. | |
241 | */ | |
ffe60014 DG |
242 | static int create_ust_streams(struct lttng_consumer_channel *channel, |
243 | struct lttng_consumer_local_data *ctx) | |
244 | { | |
245 | int ret, cpu = 0; | |
246 | struct ustctl_consumer_stream *ustream; | |
247 | struct lttng_consumer_stream *stream; | |
248 | ||
249 | assert(channel); | |
250 | assert(ctx); | |
251 | ||
252 | /* | |
253 | * While a stream is available from ustctl. When NULL is returned, we've | |
254 | * reached the end of the possible stream for the channel. | |
255 | */ | |
256 | while ((ustream = ustctl_create_stream(channel->uchan, cpu))) { | |
257 | int wait_fd; | |
258 | ||
749d339a | 259 | wait_fd = ustctl_stream_get_wait_fd(ustream); |
ffe60014 DG |
260 | |
261 | /* Allocate consumer stream object. */ | |
262 | stream = allocate_stream(cpu, wait_fd, channel, ctx, &ret); | |
263 | if (!stream) { | |
264 | goto error_alloc; | |
265 | } | |
266 | stream->ustream = ustream; | |
267 | /* | |
268 | * Store it so we can save multiple function calls afterwards since | |
269 | * this value is used heavily in the stream threads. This is UST | |
270 | * specific so this is why it's done after allocation. | |
271 | */ | |
272 | stream->wait_fd = wait_fd; | |
273 | ||
274 | /* | |
275 | * Order is important this is why a list is used. On error, the caller | |
276 | * should clean this list. | |
277 | */ | |
278 | cds_list_add_tail(&stream->send_node, &channel->streams.head); | |
279 | ||
280 | ret = ustctl_get_max_subbuf_size(stream->ustream, | |
281 | &stream->max_sb_size); | |
282 | if (ret < 0) { | |
283 | ERR("ustctl_get_max_subbuf_size failed for stream %s", | |
284 | stream->name); | |
285 | goto error; | |
286 | } | |
287 | ||
288 | /* Do actions once stream has been received. */ | |
289 | if (ctx->on_recv_stream) { | |
290 | ret = ctx->on_recv_stream(stream); | |
291 | if (ret < 0) { | |
292 | goto error; | |
293 | } | |
294 | } | |
295 | ||
d88aee68 | 296 | DBG("UST consumer add stream %s (key: %" PRIu64 ") with relayd id %" PRIu64, |
ffe60014 DG |
297 | stream->name, stream->key, stream->relayd_stream_id); |
298 | ||
299 | /* Set next CPU stream. */ | |
300 | channel->streams.count = ++cpu; | |
d88aee68 DG |
301 | |
302 | /* Keep stream reference when creating metadata. */ | |
303 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) { | |
304 | channel->metadata_stream = stream; | |
305 | } | |
ffe60014 DG |
306 | } |
307 | ||
308 | return 0; | |
309 | ||
310 | error: | |
311 | error_alloc: | |
312 | return ret; | |
313 | } | |
314 | ||
315 | /* | |
316 | * Create an UST channel with the given attributes and send it to the session | |
317 | * daemon using the ust ctl API. | |
318 | * | |
319 | * Return 0 on success or else a negative value. | |
320 | */ | |
321 | static int create_ust_channel(struct ustctl_consumer_channel_attr *attr, | |
322 | struct ustctl_consumer_channel **chanp) | |
323 | { | |
324 | int ret; | |
325 | struct ustctl_consumer_channel *channel; | |
326 | ||
327 | assert(attr); | |
328 | assert(chanp); | |
329 | ||
330 | DBG3("Creating channel to ustctl with attr: [overwrite: %d, " | |
331 | "subbuf_size: %" PRIu64 ", num_subbuf: %" PRIu64 ", " | |
332 | "switch_timer_interval: %u, read_timer_interval: %u, " | |
333 | "output: %d, type: %d", attr->overwrite, attr->subbuf_size, | |
334 | attr->num_subbuf, attr->switch_timer_interval, | |
335 | attr->read_timer_interval, attr->output, attr->type); | |
336 | ||
337 | channel = ustctl_create_channel(attr); | |
338 | if (!channel) { | |
339 | ret = -1; | |
340 | goto error_create; | |
341 | } | |
342 | ||
343 | *chanp = channel; | |
344 | ||
345 | return 0; | |
346 | ||
347 | error_create: | |
348 | return ret; | |
349 | } | |
350 | ||
d88aee68 DG |
351 | /* |
352 | * Send a single given stream to the session daemon using the sock. | |
353 | * | |
354 | * Return 0 on success else a negative value. | |
355 | */ | |
ffe60014 DG |
356 | static int send_sessiond_stream(int sock, struct lttng_consumer_stream *stream) |
357 | { | |
358 | int ret; | |
359 | ||
360 | assert(stream); | |
361 | assert(sock >= 0); | |
362 | ||
d88aee68 | 363 | DBG2("UST consumer sending stream %" PRIu64 " to sessiond", stream->key); |
ffe60014 DG |
364 | |
365 | /* Send stream to session daemon. */ | |
366 | ret = ustctl_send_stream_to_sessiond(sock, stream->ustream); | |
367 | if (ret < 0) { | |
368 | goto error; | |
369 | } | |
370 | ||
ffe60014 DG |
371 | error: |
372 | return ret; | |
373 | } | |
374 | ||
375 | /* | |
376 | * Send channel to sessiond. | |
377 | * | |
d88aee68 | 378 | * Return 0 on success or else a negative value. |
ffe60014 DG |
379 | */ |
380 | static int send_sessiond_channel(int sock, | |
381 | struct lttng_consumer_channel *channel, | |
382 | struct lttng_consumer_local_data *ctx, int *relayd_error) | |
383 | { | |
384 | int ret; | |
385 | struct lttng_consumer_stream *stream; | |
386 | ||
387 | assert(channel); | |
388 | assert(ctx); | |
389 | assert(sock >= 0); | |
390 | ||
391 | DBG("UST consumer sending channel %s to sessiond", channel->name); | |
392 | ||
393 | /* Send channel to sessiond. */ | |
394 | ret = ustctl_send_channel_to_sessiond(sock, channel->uchan); | |
395 | if (ret < 0) { | |
396 | goto error; | |
397 | } | |
398 | ||
d8ef542d MD |
399 | ret = ustctl_channel_close_wakeup_fd(channel->uchan); |
400 | if (ret < 0) { | |
401 | goto error; | |
402 | } | |
403 | ||
ffe60014 DG |
404 | /* The channel was sent successfully to the sessiond at this point. */ |
405 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
406 | /* Try to send the stream to the relayd if one is available. */ | |
407 | ret = send_stream_to_relayd(stream); | |
408 | if (ret < 0) { | |
409 | /* | |
410 | * Flag that the relayd was the problem here probably due to a | |
411 | * communicaton error on the socket. | |
412 | */ | |
413 | if (relayd_error) { | |
414 | *relayd_error = 1; | |
415 | } | |
416 | goto error; | |
417 | } | |
418 | ||
419 | /* Send stream to session daemon. */ | |
420 | ret = send_sessiond_stream(sock, stream); | |
421 | if (ret < 0) { | |
422 | goto error; | |
423 | } | |
424 | } | |
425 | ||
426 | /* Tell sessiond there is no more stream. */ | |
427 | ret = ustctl_send_stream_to_sessiond(sock, NULL); | |
428 | if (ret < 0) { | |
429 | goto error; | |
430 | } | |
431 | ||
432 | DBG("UST consumer NULL stream sent to sessiond"); | |
433 | ||
434 | return 0; | |
435 | ||
436 | error: | |
437 | return ret; | |
438 | } | |
439 | ||
440 | /* | |
441 | * Creates a channel and streams and add the channel it to the channel internal | |
442 | * state. The created stream must ONLY be sent once the GET_CHANNEL command is | |
443 | * received. | |
444 | * | |
445 | * Return 0 on success or else, a negative value is returned and the channel | |
446 | * MUST be destroyed by consumer_del_channel(). | |
447 | */ | |
448 | static int ask_channel(struct lttng_consumer_local_data *ctx, int sock, | |
449 | struct lttng_consumer_channel *channel, | |
450 | struct ustctl_consumer_channel_attr *attr) | |
3bd1e081 MD |
451 | { |
452 | int ret; | |
453 | ||
ffe60014 DG |
454 | assert(ctx); |
455 | assert(channel); | |
456 | assert(attr); | |
457 | ||
458 | /* | |
459 | * This value is still used by the kernel consumer since for the kernel, | |
460 | * the stream ownership is not IN the consumer so we need to have the | |
461 | * number of left stream that needs to be initialized so we can know when | |
462 | * to delete the channel (see consumer.c). | |
463 | * | |
464 | * As for the user space tracer now, the consumer creates and sends the | |
465 | * stream to the session daemon which only sends them to the application | |
466 | * once every stream of a channel is received making this value useless | |
467 | * because we they will be added to the poll thread before the application | |
468 | * receives them. This ensures that a stream can not hang up during | |
469 | * initilization of a channel. | |
470 | */ | |
471 | channel->nb_init_stream_left = 0; | |
472 | ||
473 | /* The reply msg status is handled in the following call. */ | |
474 | ret = create_ust_channel(attr, &channel->uchan); | |
475 | if (ret < 0) { | |
476 | goto error; | |
3bd1e081 MD |
477 | } |
478 | ||
d8ef542d MD |
479 | channel->wait_fd = ustctl_channel_get_wait_fd(channel->uchan); |
480 | ||
481 | if (ret < 0) { | |
482 | goto error; | |
483 | } | |
484 | ||
ffe60014 DG |
485 | /* Open all streams for this channel. */ |
486 | ret = create_ust_streams(channel, ctx); | |
487 | if (ret < 0) { | |
488 | goto error; | |
489 | } | |
490 | ||
491 | error: | |
3bd1e081 MD |
492 | return ret; |
493 | } | |
494 | ||
d88aee68 DG |
495 | /* |
496 | * Send all stream of a channel to the right thread handling it. | |
497 | * | |
498 | * On error, return a negative value else 0 on success. | |
499 | */ | |
500 | static int send_streams_to_thread(struct lttng_consumer_channel *channel, | |
501 | struct lttng_consumer_local_data *ctx) | |
502 | { | |
503 | int ret = 0; | |
504 | struct lttng_consumer_stream *stream, *stmp; | |
505 | ||
506 | assert(channel); | |
507 | assert(ctx); | |
508 | ||
509 | /* Send streams to the corresponding thread. */ | |
510 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
511 | send_node) { | |
512 | /* Sending the stream to the thread. */ | |
513 | ret = send_stream_to_thread(stream, ctx); | |
514 | if (ret < 0) { | |
515 | /* | |
516 | * If we are unable to send the stream to the thread, there is | |
517 | * a big problem so just stop everything. | |
518 | */ | |
519 | goto error; | |
520 | } | |
521 | ||
522 | /* Remove node from the channel stream list. */ | |
523 | cds_list_del(&stream->send_node); | |
524 | } | |
525 | ||
526 | error: | |
527 | return ret; | |
528 | } | |
529 | ||
530 | /* | |
531 | * Write metadata to the given channel using ustctl to convert the string to | |
532 | * the ringbuffer. | |
533 | * | |
534 | * Return 0 on success else a negative value. | |
535 | */ | |
536 | static int push_metadata(struct lttng_consumer_channel *metadata, | |
537 | const char *metadata_str, uint64_t target_offset, uint64_t len) | |
538 | { | |
539 | int ret; | |
540 | ||
541 | assert(metadata); | |
542 | assert(metadata_str); | |
543 | ||
544 | DBG("UST consumer writing metadata to channel %s", metadata->name); | |
545 | ||
546 | assert(target_offset == metadata->contig_metadata_written); | |
547 | ret = ustctl_write_metadata_to_channel(metadata->uchan, metadata_str, len); | |
548 | if (ret < 0) { | |
549 | ERR("ustctl write metadata fail with ret %d, len %ld", ret, len); | |
550 | goto error; | |
551 | } | |
552 | metadata->contig_metadata_written += len; | |
553 | ||
554 | ustctl_flush_buffer(metadata->metadata_stream->ustream, 1); | |
555 | ||
556 | error: | |
557 | return ret; | |
558 | } | |
559 | ||
560 | /* | |
561 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. | |
562 | * | |
563 | * Return 0 on success else an LTTng error code. | |
564 | */ | |
565 | static int close_metadata(uint64_t chan_key) | |
566 | { | |
567 | int ret; | |
568 | struct lttng_consumer_channel *channel; | |
569 | ||
570 | DBG("UST consumer close metadata key %lu", chan_key); | |
571 | ||
572 | channel = consumer_find_channel(chan_key); | |
573 | if (!channel) { | |
574 | ERR("UST consumer close metadata %lu not found", chan_key); | |
575 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
576 | goto error; | |
577 | } | |
578 | ||
579 | ret = ustctl_stream_close_wakeup_fd(channel->metadata_stream->ustream); | |
580 | if (ret < 0) { | |
581 | ERR("UST consumer unable to close fd of metadata (ret: %d)", ret); | |
582 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
583 | goto error; | |
584 | } | |
585 | ||
586 | error: | |
587 | return ret; | |
588 | } | |
589 | ||
590 | /* | |
591 | * RCU read side lock MUST be acquired before calling this function. | |
592 | * | |
593 | * Return 0 on success else an LTTng error code. | |
594 | */ | |
595 | static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key) | |
596 | { | |
597 | int ret; | |
598 | struct lttng_consumer_channel *metadata; | |
599 | ||
600 | DBG("UST consumer setup metadata key %lu", key); | |
601 | ||
602 | metadata = consumer_find_channel(key); | |
603 | if (!metadata) { | |
604 | ERR("UST consumer push metadata %" PRIu64 " not found", key); | |
605 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
606 | goto error; | |
607 | } | |
608 | ||
609 | /* | |
610 | * Send metadata stream to relayd if one available. Availability is | |
611 | * known if the stream is still in the list of the channel. | |
612 | */ | |
613 | if (cds_list_empty(&metadata->streams.head)) { | |
614 | ERR("Metadata channel key %" PRIu64 ", no stream available.", key); | |
615 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
616 | goto error; | |
617 | } | |
618 | ||
619 | /* Send metadata stream to relayd if needed. */ | |
620 | ret = send_stream_to_relayd(metadata->metadata_stream); | |
621 | if (ret < 0) { | |
622 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
623 | goto error; | |
624 | } | |
625 | ||
626 | ret = send_streams_to_thread(metadata, ctx); | |
627 | if (ret < 0) { | |
628 | /* | |
629 | * If we are unable to send the stream to the thread, there is | |
630 | * a big problem so just stop everything. | |
631 | */ | |
632 | ret = LTTCOMM_CONSUMERD_FATAL; | |
633 | goto error; | |
634 | } | |
635 | /* List MUST be empty after or else it could be reused. */ | |
636 | assert(cds_list_empty(&metadata->streams.head)); | |
637 | ||
638 | ret = 0; | |
639 | ||
640 | error: | |
641 | return ret; | |
642 | } | |
643 | ||
4cbc1a04 DG |
644 | /* |
645 | * Receive command from session daemon and process it. | |
646 | * | |
647 | * Return 1 on success else a negative value or 0. | |
648 | */ | |
3bd1e081 MD |
649 | int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
650 | int sock, struct pollfd *consumer_sockpoll) | |
651 | { | |
652 | ssize_t ret; | |
f50f23d9 | 653 | enum lttng_error_code ret_code = LTTNG_OK; |
3bd1e081 | 654 | struct lttcomm_consumer_msg msg; |
ffe60014 | 655 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 MD |
656 | |
657 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); | |
658 | if (ret != sizeof(msg)) { | |
173af62f DG |
659 | DBG("Consumer received unexpected message size %zd (expects %zu)", |
660 | ret, sizeof(msg)); | |
ffe60014 | 661 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
3be74084 DG |
662 | /* |
663 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
664 | * since the caller handles this. | |
665 | */ | |
3bd1e081 MD |
666 | return ret; |
667 | } | |
668 | if (msg.cmd_type == LTTNG_CONSUMER_STOP) { | |
f50f23d9 DG |
669 | /* |
670 | * Notify the session daemon that the command is completed. | |
671 | * | |
672 | * On transport layer error, the function call will print an error | |
673 | * message so handling the returned code is a bit useless since we | |
674 | * return an error code anyway. | |
675 | */ | |
676 | (void) consumer_send_status_msg(sock, ret_code); | |
3bd1e081 MD |
677 | return -ENOENT; |
678 | } | |
679 | ||
3f8e211f | 680 | /* relayd needs RCU read-side lock */ |
b0b335c8 MD |
681 | rcu_read_lock(); |
682 | ||
3bd1e081 | 683 | switch (msg.cmd_type) { |
00e2e675 DG |
684 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
685 | { | |
f50f23d9 | 686 | /* Session daemon status message are handled in the following call. */ |
7735ef9e DG |
687 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
688 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, | |
46e6455f | 689 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id); |
00e2e675 DG |
690 | goto end_nosignal; |
691 | } | |
173af62f DG |
692 | case LTTNG_CONSUMER_DESTROY_RELAYD: |
693 | { | |
a6ba4fe1 | 694 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
173af62f DG |
695 | struct consumer_relayd_sock_pair *relayd; |
696 | ||
a6ba4fe1 | 697 | DBG("UST consumer destroying relayd %" PRIu64, index); |
173af62f DG |
698 | |
699 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 700 | relayd = consumer_find_relayd(index); |
173af62f | 701 | if (relayd == NULL) { |
3448e266 | 702 | DBG("Unable to find relayd %" PRIu64, index); |
f50f23d9 | 703 | ret_code = LTTNG_ERR_NO_CONSUMER; |
173af62f DG |
704 | } |
705 | ||
a6ba4fe1 DG |
706 | /* |
707 | * Each relayd socket pair has a refcount of stream attached to it | |
708 | * which tells if the relayd is still active or not depending on the | |
709 | * refcount value. | |
710 | * | |
711 | * This will set the destroy flag of the relayd object and destroy it | |
712 | * if the refcount reaches zero when called. | |
713 | * | |
714 | * The destroy can happen either here or when a stream fd hangs up. | |
715 | */ | |
f50f23d9 DG |
716 | if (relayd) { |
717 | consumer_flag_relayd_for_destroy(relayd); | |
718 | } | |
719 | ||
d88aee68 | 720 | goto end_msg_sessiond; |
173af62f | 721 | } |
3bd1e081 MD |
722 | case LTTNG_CONSUMER_UPDATE_STREAM: |
723 | { | |
3f8e211f | 724 | rcu_read_unlock(); |
7ad0a0cb | 725 | return -ENOSYS; |
3bd1e081 | 726 | } |
6d805429 | 727 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 728 | { |
3be74084 | 729 | int ret, is_data_pending; |
6d805429 | 730 | uint64_t id = msg.u.data_pending.session_id; |
ca22feea | 731 | |
6d805429 | 732 | DBG("UST consumer data pending command for id %" PRIu64, id); |
ca22feea | 733 | |
3be74084 | 734 | is_data_pending = consumer_data_pending(id); |
ca22feea DG |
735 | |
736 | /* Send back returned value to session daemon */ | |
3be74084 DG |
737 | ret = lttcomm_send_unix_sock(sock, &is_data_pending, |
738 | sizeof(is_data_pending)); | |
ca22feea | 739 | if (ret < 0) { |
3be74084 | 740 | DBG("Error when sending the data pending ret code: %d", ret); |
ca22feea | 741 | } |
f50f23d9 DG |
742 | |
743 | /* | |
744 | * No need to send back a status message since the data pending | |
745 | * returned value is the response. | |
746 | */ | |
ca22feea | 747 | break; |
53632229 | 748 | } |
ffe60014 DG |
749 | case LTTNG_CONSUMER_ASK_CHANNEL_CREATION: |
750 | { | |
751 | int ret; | |
752 | struct ustctl_consumer_channel_attr attr; | |
753 | ||
754 | /* Create a plain object and reserve a channel key. */ | |
755 | channel = allocate_channel(msg.u.ask_channel.session_id, | |
756 | msg.u.ask_channel.pathname, msg.u.ask_channel.name, | |
757 | msg.u.ask_channel.uid, msg.u.ask_channel.gid, | |
758 | msg.u.ask_channel.relayd_id, msg.u.ask_channel.key, | |
759 | (enum lttng_event_output) msg.u.ask_channel.output); | |
760 | if (!channel) { | |
761 | goto end_channel_error; | |
762 | } | |
763 | ||
764 | /* Build channel attributes from received message. */ | |
765 | attr.subbuf_size = msg.u.ask_channel.subbuf_size; | |
766 | attr.num_subbuf = msg.u.ask_channel.num_subbuf; | |
767 | attr.overwrite = msg.u.ask_channel.overwrite; | |
768 | attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval; | |
769 | attr.read_timer_interval = msg.u.ask_channel.read_timer_interval; | |
770 | memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid)); | |
771 | ||
772 | /* Translate the event output type to UST. */ | |
773 | switch (channel->output) { | |
774 | case LTTNG_EVENT_SPLICE: | |
775 | /* Splice not supported so fallback on mmap(). */ | |
776 | case LTTNG_EVENT_MMAP: | |
777 | default: | |
778 | attr.output = CONSUMER_CHANNEL_MMAP; | |
779 | break; | |
780 | }; | |
781 | ||
782 | /* Translate and save channel type. */ | |
783 | switch (msg.u.ask_channel.type) { | |
784 | case LTTNG_UST_CHAN_PER_CPU: | |
785 | channel->type = CONSUMER_CHANNEL_TYPE_DATA; | |
786 | attr.type = LTTNG_UST_CHAN_PER_CPU; | |
787 | break; | |
788 | case LTTNG_UST_CHAN_METADATA: | |
789 | channel->type = CONSUMER_CHANNEL_TYPE_METADATA; | |
790 | attr.type = LTTNG_UST_CHAN_METADATA; | |
791 | break; | |
792 | default: | |
793 | assert(0); | |
794 | goto error_fatal; | |
795 | }; | |
796 | ||
797 | ret = ask_channel(ctx, sock, channel, &attr); | |
798 | if (ret < 0) { | |
799 | goto end_channel_error; | |
800 | } | |
801 | ||
802 | /* | |
803 | * Add the channel to the internal state AFTER all streams were created | |
804 | * and successfully sent to session daemon. This way, all streams must | |
805 | * be ready before this channel is visible to the threads. | |
806 | */ | |
807 | ret = add_channel(channel, ctx); | |
808 | if (ret < 0) { | |
809 | goto end_channel_error; | |
810 | } | |
811 | ||
812 | /* | |
813 | * Channel and streams are now created. Inform the session daemon that | |
814 | * everything went well and should wait to receive the channel and | |
815 | * streams with ustctl API. | |
816 | */ | |
817 | ret = consumer_send_status_channel(sock, channel); | |
818 | if (ret < 0) { | |
819 | /* | |
820 | * There is probably a problem on the socket so the poll will get | |
821 | * it and clean everything up. | |
822 | */ | |
823 | goto end_nosignal; | |
824 | } | |
825 | ||
826 | break; | |
827 | } | |
828 | case LTTNG_CONSUMER_GET_CHANNEL: | |
829 | { | |
830 | int ret, relayd_err = 0; | |
d88aee68 | 831 | uint64_t key = msg.u.get_channel.key; |
ffe60014 | 832 | struct lttng_consumer_channel *channel; |
ffe60014 DG |
833 | |
834 | channel = consumer_find_channel(key); | |
835 | if (!channel) { | |
836 | ERR("UST consumer get channel key %lu not found", key); | |
837 | ret_code = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
838 | goto end_msg_sessiond; | |
839 | } | |
840 | ||
841 | /* Inform sessiond that we are about to send channel and streams. */ | |
842 | ret = consumer_send_status_msg(sock, LTTNG_OK); | |
843 | if (ret < 0) { | |
844 | /* Somehow, the session daemon is not responding anymore. */ | |
845 | goto end_nosignal; | |
846 | } | |
847 | ||
848 | /* Send everything to sessiond. */ | |
849 | ret = send_sessiond_channel(sock, channel, ctx, &relayd_err); | |
850 | if (ret < 0) { | |
851 | if (relayd_err) { | |
852 | /* | |
853 | * We were unable to send to the relayd the stream so avoid | |
854 | * sending back a fatal error to the thread since this is OK | |
855 | * and the consumer can continue its work. | |
856 | */ | |
857 | ret_code = LTTNG_ERR_RELAYD_CONNECT_FAIL; | |
858 | goto end_msg_sessiond; | |
859 | } | |
860 | /* | |
861 | * The communicaton was broken hence there is a bad state between | |
862 | * the consumer and sessiond so stop everything. | |
863 | */ | |
864 | goto error_fatal; | |
865 | } | |
866 | ||
d88aee68 DG |
867 | ret = send_streams_to_thread(channel, ctx); |
868 | if (ret < 0) { | |
869 | /* | |
870 | * If we are unable to send the stream to the thread, there is | |
871 | * a big problem so just stop everything. | |
872 | */ | |
873 | goto error_fatal; | |
ffe60014 | 874 | } |
ffe60014 DG |
875 | /* List MUST be empty after or else it could be reused. */ |
876 | assert(cds_list_empty(&channel->streams.head)); | |
877 | ||
d88aee68 DG |
878 | goto end_msg_sessiond; |
879 | } | |
880 | case LTTNG_CONSUMER_DESTROY_CHANNEL: | |
881 | { | |
882 | uint64_t key = msg.u.destroy_channel.key; | |
883 | struct lttng_consumer_channel *channel; | |
884 | ||
885 | channel = consumer_find_channel(key); | |
886 | if (!channel) { | |
887 | ERR("UST consumer get channel key %lu not found", key); | |
888 | ret_code = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
889 | goto end_msg_sessiond; | |
ffe60014 DG |
890 | } |
891 | ||
d88aee68 DG |
892 | destroy_channel(channel); |
893 | ||
894 | goto end_msg_sessiond; | |
ffe60014 | 895 | } |
d88aee68 DG |
896 | case LTTNG_CONSUMER_CLOSE_METADATA: |
897 | { | |
898 | int ret; | |
899 | ||
900 | ret = close_metadata(msg.u.close_metadata.key); | |
901 | if (ret != 0) { | |
902 | ret_code = ret; | |
903 | } | |
904 | ||
905 | goto end_msg_sessiond; | |
906 | } | |
907 | case LTTNG_CONSUMER_PUSH_METADATA: | |
ffe60014 DG |
908 | { |
909 | int ret; | |
d88aee68 DG |
910 | uint64_t len = msg.u.push_metadata.len; |
911 | uint64_t target_offset = msg.u.push_metadata.target_offset; | |
912 | uint64_t key = msg.u.push_metadata.key; | |
ffe60014 | 913 | struct lttng_consumer_channel *channel; |
d88aee68 | 914 | char *metadata_str; |
ffe60014 | 915 | |
d88aee68 | 916 | DBG("UST consumer push metadata key %lu of len %lu", key, len); |
ffe60014 DG |
917 | |
918 | channel = consumer_find_channel(key); | |
919 | if (!channel) { | |
d88aee68 | 920 | ERR("UST consumer push metadata %lu not found", key); |
ffe60014 | 921 | ret_code = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
ffe60014 DG |
922 | } |
923 | ||
d88aee68 DG |
924 | metadata_str = zmalloc(len * sizeof(char)); |
925 | if (!metadata_str) { | |
926 | PERROR("zmalloc metadata string"); | |
927 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; | |
928 | goto end_msg_sessiond; | |
929 | } | |
930 | ||
931 | /* Tell session daemon we are ready to receive the metadata. */ | |
ffe60014 DG |
932 | ret = consumer_send_status_msg(sock, LTTNG_OK); |
933 | if (ret < 0) { | |
934 | /* Somehow, the session daemon is not responding anymore. */ | |
d88aee68 DG |
935 | goto error_fatal; |
936 | } | |
937 | ||
938 | /* Wait for more data. */ | |
939 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
940 | goto end_nosignal; | |
941 | } | |
942 | ||
943 | /* Receive metadata string. */ | |
944 | ret = lttcomm_recv_unix_sock(sock, metadata_str, len); | |
945 | if (ret < 0) { | |
946 | /* Session daemon is dead so return gracefully. */ | |
ffe60014 DG |
947 | goto end_nosignal; |
948 | } | |
d88aee68 DG |
949 | |
950 | ret = push_metadata(channel, metadata_str, target_offset, len); | |
951 | free(metadata_str); | |
952 | if (ret < 0) { | |
953 | /* Unable to handle metadata. Notify session daemon. */ | |
954 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
955 | goto end_msg_sessiond; | |
956 | } | |
957 | ||
958 | goto end_msg_sessiond; | |
959 | } | |
960 | case LTTNG_CONSUMER_SETUP_METADATA: | |
961 | { | |
962 | int ret; | |
963 | ||
964 | ret = setup_metadata(ctx, msg.u.setup_metadata.key); | |
965 | if (ret) { | |
966 | ret_code = ret; | |
967 | } | |
968 | goto end_msg_sessiond; | |
ffe60014 | 969 | } |
3bd1e081 MD |
970 | default: |
971 | break; | |
972 | } | |
3f8e211f | 973 | |
3bd1e081 | 974 | end_nosignal: |
b0b335c8 | 975 | rcu_read_unlock(); |
4cbc1a04 DG |
976 | |
977 | /* | |
978 | * Return 1 to indicate success since the 0 value can be a socket | |
979 | * shutdown during the recv() or send() call. | |
980 | */ | |
981 | return 1; | |
ffe60014 DG |
982 | |
983 | end_msg_sessiond: | |
984 | /* | |
985 | * The returned value here is not useful since either way we'll return 1 to | |
986 | * the caller because the session daemon socket management is done | |
987 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. | |
988 | */ | |
989 | (void) consumer_send_status_msg(sock, ret_code); | |
990 | rcu_read_unlock(); | |
991 | return 1; | |
992 | end_channel_error: | |
993 | if (channel) { | |
994 | /* | |
995 | * Free channel here since no one has a reference to it. We don't | |
996 | * free after that because a stream can store this pointer. | |
997 | */ | |
998 | destroy_channel(channel); | |
999 | } | |
1000 | /* We have to send a status channel message indicating an error. */ | |
1001 | ret = consumer_send_status_channel(sock, NULL); | |
1002 | if (ret < 0) { | |
1003 | /* Stop everything if session daemon can not be notified. */ | |
1004 | goto error_fatal; | |
1005 | } | |
1006 | rcu_read_unlock(); | |
1007 | return 1; | |
1008 | error_fatal: | |
1009 | rcu_read_unlock(); | |
1010 | /* This will issue a consumer stop. */ | |
1011 | return -1; | |
3bd1e081 MD |
1012 | } |
1013 | ||
ffe60014 DG |
1014 | /* |
1015 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
1016 | * compiled out, we isolate it in this library. | |
1017 | */ | |
1018 | int lttng_ustctl_get_mmap_read_offset(struct lttng_consumer_stream *stream, | |
1019 | unsigned long *off) | |
3bd1e081 | 1020 | { |
ffe60014 DG |
1021 | assert(stream); |
1022 | assert(stream->ustream); | |
b5c5fc29 | 1023 | |
ffe60014 | 1024 | return ustctl_get_mmap_read_offset(stream->ustream, off); |
3bd1e081 MD |
1025 | } |
1026 | ||
ffe60014 DG |
1027 | /* |
1028 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
1029 | * compiled out, we isolate it in this library. | |
1030 | */ | |
1031 | void *lttng_ustctl_get_mmap_base(struct lttng_consumer_stream *stream) | |
d056b477 | 1032 | { |
ffe60014 DG |
1033 | assert(stream); |
1034 | assert(stream->ustream); | |
1035 | ||
1036 | return ustctl_get_mmap_base(stream->ustream); | |
d056b477 MD |
1037 | } |
1038 | ||
ffe60014 DG |
1039 | /* |
1040 | * Take a snapshot for a specific fd | |
1041 | * | |
1042 | * Returns 0 on success, < 0 on error | |
1043 | */ | |
1044 | int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream) | |
3bd1e081 | 1045 | { |
ffe60014 DG |
1046 | assert(stream); |
1047 | assert(stream->ustream); | |
1048 | ||
1049 | return ustctl_snapshot(stream->ustream); | |
3bd1e081 MD |
1050 | } |
1051 | ||
ffe60014 DG |
1052 | /* |
1053 | * Get the produced position | |
1054 | * | |
1055 | * Returns 0 on success, < 0 on error | |
1056 | */ | |
1057 | int lttng_ustconsumer_get_produced_snapshot( | |
1058 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
3bd1e081 | 1059 | { |
ffe60014 DG |
1060 | assert(stream); |
1061 | assert(stream->ustream); | |
1062 | assert(pos); | |
7a57cf92 | 1063 | |
ffe60014 DG |
1064 | return ustctl_snapshot_get_produced(stream->ustream, pos); |
1065 | } | |
7a57cf92 | 1066 | |
ffe60014 DG |
1067 | /* |
1068 | * Called when the stream signal the consumer that it has hang up. | |
1069 | */ | |
1070 | void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream) | |
1071 | { | |
1072 | assert(stream); | |
1073 | assert(stream->ustream); | |
2c1dd183 | 1074 | |
ffe60014 DG |
1075 | ustctl_flush_buffer(stream->ustream, 0); |
1076 | stream->hangup_flush_done = 1; | |
1077 | } | |
ee77a7b0 | 1078 | |
ffe60014 DG |
1079 | void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan) |
1080 | { | |
1081 | assert(chan); | |
1082 | assert(chan->uchan); | |
e316aad5 | 1083 | |
ffe60014 | 1084 | ustctl_destroy_channel(chan->uchan); |
3bd1e081 MD |
1085 | } |
1086 | ||
1087 | void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream) | |
1088 | { | |
ffe60014 DG |
1089 | assert(stream); |
1090 | assert(stream->ustream); | |
d41f73b7 | 1091 | |
ffe60014 DG |
1092 | ustctl_destroy_stream(stream->ustream); |
1093 | } | |
d41f73b7 MD |
1094 | |
1095 | int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream, | |
1096 | struct lttng_consumer_local_data *ctx) | |
1097 | { | |
1d4dfdef | 1098 | unsigned long len, subbuf_size, padding; |
d41f73b7 MD |
1099 | int err; |
1100 | long ret = 0; | |
d41f73b7 | 1101 | char dummy; |
ffe60014 DG |
1102 | struct ustctl_consumer_stream *ustream; |
1103 | ||
1104 | assert(stream); | |
1105 | assert(stream->ustream); | |
1106 | assert(ctx); | |
d41f73b7 | 1107 | |
ffe60014 DG |
1108 | DBG2("In UST read_subbuffer (wait_fd: %d, name: %s)", stream->wait_fd, |
1109 | stream->name); | |
1110 | ||
1111 | /* Ease our life for what's next. */ | |
1112 | ustream = stream->ustream; | |
d41f73b7 MD |
1113 | |
1114 | /* We can consume the 1 byte written into the wait_fd by UST */ | |
effcf122 | 1115 | if (!stream->hangup_flush_done) { |
c617c0c6 MD |
1116 | ssize_t readlen; |
1117 | ||
effcf122 MD |
1118 | do { |
1119 | readlen = read(stream->wait_fd, &dummy, 1); | |
87dc6a9c | 1120 | } while (readlen == -1 && errno == EINTR); |
effcf122 MD |
1121 | if (readlen == -1) { |
1122 | ret = readlen; | |
1123 | goto end; | |
1124 | } | |
d41f73b7 MD |
1125 | } |
1126 | ||
d41f73b7 | 1127 | /* Get the next subbuffer */ |
ffe60014 | 1128 | err = ustctl_get_next_subbuf(ustream); |
d41f73b7 | 1129 | if (err != 0) { |
1d4dfdef | 1130 | ret = err; /* ustctl_get_next_subbuf returns negative, caller expect positive. */ |
d41f73b7 MD |
1131 | /* |
1132 | * This is a debug message even for single-threaded consumer, | |
1133 | * because poll() have more relaxed criterions than get subbuf, | |
1134 | * so get_subbuf may fail for short race windows where poll() | |
1135 | * would issue wakeups. | |
1136 | */ | |
1137 | DBG("Reserving sub buffer failed (everything is normal, " | |
ffe60014 | 1138 | "it is due to concurrency) [ret: %d]", err); |
d41f73b7 MD |
1139 | goto end; |
1140 | } | |
ffe60014 | 1141 | assert(stream->chan->output == CONSUMER_CHANNEL_MMAP); |
1d4dfdef | 1142 | /* Get the full padded subbuffer size */ |
ffe60014 | 1143 | err = ustctl_get_padded_subbuf_size(ustream, &len); |
effcf122 | 1144 | assert(err == 0); |
1d4dfdef DG |
1145 | |
1146 | /* Get subbuffer data size (without padding) */ | |
ffe60014 | 1147 | err = ustctl_get_subbuf_size(ustream, &subbuf_size); |
1d4dfdef DG |
1148 | assert(err == 0); |
1149 | ||
1150 | /* Make sure we don't get a subbuffer size bigger than the padded */ | |
1151 | assert(len >= subbuf_size); | |
1152 | ||
1153 | padding = len - subbuf_size; | |
d41f73b7 | 1154 | /* write the subbuffer to the tracefile */ |
1d4dfdef | 1155 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, padding); |
91dfef6e DG |
1156 | /* |
1157 | * The mmap operation should write subbuf_size amount of data when network | |
1158 | * streaming or the full padding (len) size when we are _not_ streaming. | |
1159 | */ | |
d88aee68 DG |
1160 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
1161 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
d41f73b7 | 1162 | /* |
91dfef6e | 1163 | * Display the error but continue processing to try to release the |
c5c45efa DG |
1164 | * subbuffer. This is a DBG statement since any unexpected kill or |
1165 | * signal, the application gets unregistered, relayd gets closed or | |
1166 | * anything that affects the buffer lifetime will trigger this error. | |
1167 | * So, for the sake of the user, don't print this error since it can | |
1168 | * happen and it is OK with the code flow. | |
d41f73b7 | 1169 | */ |
c5c45efa | 1170 | DBG("Error writing to tracefile " |
91dfef6e DG |
1171 | "(ret: %zd != len: %lu != subbuf_size: %lu)", |
1172 | ret, len, subbuf_size); | |
d41f73b7 | 1173 | } |
ffe60014 | 1174 | err = ustctl_put_next_subbuf(ustream); |
effcf122 | 1175 | assert(err == 0); |
d41f73b7 MD |
1176 | end: |
1177 | return ret; | |
1178 | } | |
1179 | ||
ffe60014 DG |
1180 | /* |
1181 | * Called when a stream is created. | |
1182 | */ | |
d41f73b7 MD |
1183 | int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream) |
1184 | { | |
1185 | int ret; | |
ffe60014 | 1186 | char full_path[PATH_MAX]; |
d41f73b7 MD |
1187 | |
1188 | /* Opening the tracefile in write mode */ | |
d88aee68 | 1189 | if (stream->net_seq_idx != (uint64_t) -1ULL) { |
ffe60014 | 1190 | goto end; |
d41f73b7 MD |
1191 | } |
1192 | ||
ffe60014 DG |
1193 | ret = snprintf(full_path, sizeof(full_path), "%s/%s", |
1194 | stream->chan->pathname, stream->name); | |
1195 | if (ret < 0) { | |
1196 | PERROR("snprintf on_recv_stream"); | |
1197 | goto error; | |
1198 | } | |
1199 | ||
1200 | ret = run_as_open(full_path, O_WRONLY | O_CREAT | O_TRUNC, | |
1201 | S_IRWXU | S_IRWXG | S_IRWXO, stream->uid, stream->gid); | |
1202 | if (ret < 0) { | |
1203 | PERROR("open stream path %s", full_path); | |
c869f647 DG |
1204 | goto error; |
1205 | } | |
ffe60014 | 1206 | stream->out_fd = ret; |
c869f647 | 1207 | |
ffe60014 | 1208 | end: |
d41f73b7 MD |
1209 | /* we return 0 to let the library handle the FD internally */ |
1210 | return 0; | |
1211 | ||
1212 | error: | |
1213 | return ret; | |
1214 | } | |
ca22feea DG |
1215 | |
1216 | /* | |
1217 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
1218 | * stream. Consumer data lock MUST be acquired before calling this function |
1219 | * and the stream lock. | |
ca22feea | 1220 | * |
6d805429 | 1221 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
1222 | * data is available for trace viewer reading. |
1223 | */ | |
6d805429 | 1224 | int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
1225 | { |
1226 | int ret; | |
1227 | ||
1228 | assert(stream); | |
ffe60014 | 1229 | assert(stream->ustream); |
ca22feea | 1230 | |
6d805429 | 1231 | DBG("UST consumer checking data pending"); |
c8f59ee5 | 1232 | |
ffe60014 | 1233 | ret = ustctl_get_next_subbuf(stream->ustream); |
ca22feea DG |
1234 | if (ret == 0) { |
1235 | /* There is still data so let's put back this subbuffer. */ | |
ffe60014 | 1236 | ret = ustctl_put_subbuf(stream->ustream); |
ca22feea | 1237 | assert(ret == 0); |
6d805429 | 1238 | ret = 1; /* Data is pending */ |
4e9a4686 | 1239 | goto end; |
ca22feea DG |
1240 | } |
1241 | ||
6d805429 DG |
1242 | /* Data is NOT pending so ready to be read. */ |
1243 | ret = 0; | |
ca22feea | 1244 | |
6efae65e DG |
1245 | end: |
1246 | return ret; | |
ca22feea | 1247 | } |
d88aee68 DG |
1248 | |
1249 | /* | |
1250 | * Close every metadata stream wait fd of the metadata hash table. This | |
1251 | * function MUST be used very carefully so not to run into a race between the | |
1252 | * metadata thread handling streams and this function closing their wait fd. | |
1253 | * | |
1254 | * For UST, this is used when the session daemon hangs up. Its the metadata | |
1255 | * producer so calling this is safe because we are assured that no state change | |
1256 | * can occur in the metadata thread for the streams in the hash table. | |
1257 | */ | |
1258 | void lttng_ustconsumer_close_metadata(struct lttng_ht *metadata_ht) | |
1259 | { | |
1260 | int ret; | |
1261 | struct lttng_ht_iter iter; | |
1262 | struct lttng_consumer_stream *stream; | |
1263 | ||
1264 | assert(metadata_ht); | |
1265 | assert(metadata_ht->ht); | |
1266 | ||
1267 | DBG("UST consumer closing all metadata streams"); | |
1268 | ||
1269 | rcu_read_lock(); | |
1270 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, | |
1271 | node.node) { | |
1272 | int fd = stream->wait_fd; | |
1273 | ||
1274 | /* | |
1275 | * Whatever happens here we have to continue to try to close every | |
1276 | * streams. Let's report at least the error on failure. | |
1277 | */ | |
1278 | ret = ustctl_stream_close_wakeup_fd(stream->ustream); | |
1279 | if (ret) { | |
1280 | ERR("Unable to close metadata stream fd %d ret %d", fd, ret); | |
1281 | } | |
1282 | DBG("Metadata wait fd %d closed", fd); | |
1283 | } | |
1284 | rcu_read_unlock(); | |
1285 | } | |
d8ef542d MD |
1286 | |
1287 | void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream) | |
1288 | { | |
1289 | int ret; | |
1290 | ||
1291 | ret = ustctl_stream_close_wakeup_fd(stream->ustream); | |
1292 | if (ret < 0) { | |
1293 | ERR("Unable to close wakeup fd"); | |
1294 | } | |
1295 | } |