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> |
331744e3 | 33 | #include <signal.h> |
0857097f | 34 | |
990570ed | 35 | #include <common/common.h> |
10a8a223 | 36 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 37 | #include <common/relayd/relayd.h> |
dbb5dfe6 | 38 | #include <common/compat/fcntl.h> |
331744e3 | 39 | #include <common/consumer-metadata-cache.h> |
10a50311 | 40 | #include <common/consumer-stream.h> |
331744e3 | 41 | #include <common/consumer-timer.h> |
fe4477ee | 42 | #include <common/utils.h> |
10a8a223 DG |
43 | |
44 | #include "ust-consumer.h" | |
3bd1e081 MD |
45 | |
46 | extern struct lttng_consumer_global_data consumer_data; | |
47 | extern int consumer_poll_timeout; | |
48 | extern volatile int consumer_quit; | |
49 | ||
50 | /* | |
ffe60014 DG |
51 | * Free channel object and all streams associated with it. This MUST be used |
52 | * only and only if the channel has _NEVER_ been added to the global channel | |
53 | * hash table. | |
3bd1e081 | 54 | */ |
ffe60014 | 55 | static void destroy_channel(struct lttng_consumer_channel *channel) |
3bd1e081 | 56 | { |
ffe60014 DG |
57 | struct lttng_consumer_stream *stream, *stmp; |
58 | ||
59 | assert(channel); | |
60 | ||
61 | DBG("UST consumer cleaning stream list"); | |
62 | ||
63 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
64 | send_node) { | |
65 | cds_list_del(&stream->send_node); | |
66 | ustctl_destroy_stream(stream->ustream); | |
67 | free(stream); | |
68 | } | |
69 | ||
70 | /* | |
71 | * If a channel is available meaning that was created before the streams | |
72 | * were, delete it. | |
73 | */ | |
74 | if (channel->uchan) { | |
75 | lttng_ustconsumer_del_channel(channel); | |
76 | } | |
77 | free(channel); | |
78 | } | |
3bd1e081 MD |
79 | |
80 | /* | |
ffe60014 | 81 | * Add channel to internal consumer state. |
3bd1e081 | 82 | * |
ffe60014 | 83 | * Returns 0 on success or else a negative value. |
3bd1e081 | 84 | */ |
ffe60014 DG |
85 | static int add_channel(struct lttng_consumer_channel *channel, |
86 | struct lttng_consumer_local_data *ctx) | |
3bd1e081 MD |
87 | { |
88 | int ret = 0; | |
89 | ||
ffe60014 DG |
90 | assert(channel); |
91 | assert(ctx); | |
92 | ||
93 | if (ctx->on_recv_channel != NULL) { | |
94 | ret = ctx->on_recv_channel(channel); | |
95 | if (ret == 0) { | |
d8ef542d | 96 | ret = consumer_add_channel(channel, ctx); |
ffe60014 DG |
97 | } else if (ret < 0) { |
98 | /* Most likely an ENOMEM. */ | |
99 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
100 | goto error; | |
101 | } | |
102 | } else { | |
d8ef542d | 103 | ret = consumer_add_channel(channel, ctx); |
3bd1e081 MD |
104 | } |
105 | ||
d88aee68 | 106 | DBG("UST consumer channel added (key: %" PRIu64 ")", channel->key); |
ffe60014 DG |
107 | |
108 | error: | |
3bd1e081 MD |
109 | return ret; |
110 | } | |
111 | ||
112 | /* | |
ffe60014 DG |
113 | * Allocate and return a consumer channel object. |
114 | */ | |
115 | static struct lttng_consumer_channel *allocate_channel(uint64_t session_id, | |
116 | const char *pathname, const char *name, uid_t uid, gid_t gid, | |
da009f2c | 117 | uint64_t relayd_id, uint64_t key, enum lttng_event_output output, |
2bba9e53 | 118 | uint64_t tracefile_size, uint64_t tracefile_count, |
1950109e | 119 | uint64_t session_id_per_pid, unsigned int monitor) |
ffe60014 DG |
120 | { |
121 | assert(pathname); | |
122 | assert(name); | |
123 | ||
1950109e JD |
124 | return consumer_allocate_channel(key, session_id, pathname, name, uid, |
125 | gid, relayd_id, output, tracefile_size, | |
126 | tracefile_count, session_id_per_pid, monitor); | |
ffe60014 DG |
127 | } |
128 | ||
129 | /* | |
130 | * Allocate and return a consumer stream object. If _alloc_ret is not NULL, the | |
131 | * error value if applicable is set in it else it is kept untouched. | |
3bd1e081 | 132 | * |
ffe60014 | 133 | * Return NULL on error else the newly allocated stream object. |
3bd1e081 | 134 | */ |
ffe60014 DG |
135 | static struct lttng_consumer_stream *allocate_stream(int cpu, int key, |
136 | struct lttng_consumer_channel *channel, | |
137 | struct lttng_consumer_local_data *ctx, int *_alloc_ret) | |
138 | { | |
139 | int alloc_ret; | |
140 | struct lttng_consumer_stream *stream = NULL; | |
141 | ||
142 | assert(channel); | |
143 | assert(ctx); | |
144 | ||
145 | stream = consumer_allocate_stream(channel->key, | |
146 | key, | |
147 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
148 | channel->name, | |
149 | channel->uid, | |
150 | channel->gid, | |
151 | channel->relayd_id, | |
152 | channel->session_id, | |
153 | cpu, | |
154 | &alloc_ret, | |
4891ece8 DG |
155 | channel->type, |
156 | channel->monitor); | |
ffe60014 DG |
157 | if (stream == NULL) { |
158 | switch (alloc_ret) { | |
159 | case -ENOENT: | |
160 | /* | |
161 | * We could not find the channel. Can happen if cpu hotplug | |
162 | * happens while tearing down. | |
163 | */ | |
164 | DBG3("Could not find channel"); | |
165 | break; | |
166 | case -ENOMEM: | |
167 | case -EINVAL: | |
168 | default: | |
169 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
170 | break; | |
171 | } | |
172 | goto error; | |
173 | } | |
174 | ||
175 | stream->chan = channel; | |
176 | ||
177 | error: | |
178 | if (_alloc_ret) { | |
179 | *_alloc_ret = alloc_ret; | |
180 | } | |
181 | return stream; | |
182 | } | |
183 | ||
184 | /* | |
185 | * Send the given stream pointer to the corresponding thread. | |
186 | * | |
187 | * Returns 0 on success else a negative value. | |
188 | */ | |
189 | static int send_stream_to_thread(struct lttng_consumer_stream *stream, | |
190 | struct lttng_consumer_local_data *ctx) | |
191 | { | |
dae10966 DG |
192 | int ret; |
193 | struct lttng_pipe *stream_pipe; | |
ffe60014 DG |
194 | |
195 | /* Get the right pipe where the stream will be sent. */ | |
196 | if (stream->metadata_flag) { | |
dae10966 | 197 | stream_pipe = ctx->consumer_metadata_pipe; |
ffe60014 | 198 | } else { |
dae10966 | 199 | stream_pipe = ctx->consumer_data_pipe; |
ffe60014 DG |
200 | } |
201 | ||
dae10966 | 202 | ret = lttng_pipe_write(stream_pipe, &stream, sizeof(stream)); |
ffe60014 | 203 | if (ret < 0) { |
dae10966 DG |
204 | ERR("Consumer write %s stream to pipe %d", |
205 | stream->metadata_flag ? "metadata" : "data", | |
206 | lttng_pipe_get_writefd(stream_pipe)); | |
ffe60014 DG |
207 | } |
208 | ||
209 | return ret; | |
210 | } | |
211 | ||
d88aee68 DG |
212 | /* |
213 | * Create streams for the given channel using liblttng-ust-ctl. | |
214 | * | |
215 | * Return 0 on success else a negative value. | |
216 | */ | |
ffe60014 DG |
217 | static int create_ust_streams(struct lttng_consumer_channel *channel, |
218 | struct lttng_consumer_local_data *ctx) | |
219 | { | |
220 | int ret, cpu = 0; | |
221 | struct ustctl_consumer_stream *ustream; | |
222 | struct lttng_consumer_stream *stream; | |
223 | ||
224 | assert(channel); | |
225 | assert(ctx); | |
226 | ||
227 | /* | |
228 | * While a stream is available from ustctl. When NULL is returned, we've | |
229 | * reached the end of the possible stream for the channel. | |
230 | */ | |
231 | while ((ustream = ustctl_create_stream(channel->uchan, cpu))) { | |
232 | int wait_fd; | |
233 | ||
749d339a | 234 | wait_fd = ustctl_stream_get_wait_fd(ustream); |
ffe60014 DG |
235 | |
236 | /* Allocate consumer stream object. */ | |
237 | stream = allocate_stream(cpu, wait_fd, channel, ctx, &ret); | |
238 | if (!stream) { | |
239 | goto error_alloc; | |
240 | } | |
241 | stream->ustream = ustream; | |
242 | /* | |
243 | * Store it so we can save multiple function calls afterwards since | |
244 | * this value is used heavily in the stream threads. This is UST | |
245 | * specific so this is why it's done after allocation. | |
246 | */ | |
247 | stream->wait_fd = wait_fd; | |
248 | ||
b31398bb DG |
249 | /* |
250 | * Increment channel refcount since the channel reference has now been | |
251 | * assigned in the allocation process above. | |
252 | */ | |
10a50311 JD |
253 | if (stream->chan->monitor) { |
254 | uatomic_inc(&stream->chan->refcount); | |
255 | } | |
b31398bb | 256 | |
ffe60014 DG |
257 | /* |
258 | * Order is important this is why a list is used. On error, the caller | |
259 | * should clean this list. | |
260 | */ | |
261 | cds_list_add_tail(&stream->send_node, &channel->streams.head); | |
262 | ||
263 | ret = ustctl_get_max_subbuf_size(stream->ustream, | |
264 | &stream->max_sb_size); | |
265 | if (ret < 0) { | |
266 | ERR("ustctl_get_max_subbuf_size failed for stream %s", | |
267 | stream->name); | |
268 | goto error; | |
269 | } | |
270 | ||
271 | /* Do actions once stream has been received. */ | |
272 | if (ctx->on_recv_stream) { | |
273 | ret = ctx->on_recv_stream(stream); | |
274 | if (ret < 0) { | |
275 | goto error; | |
276 | } | |
277 | } | |
278 | ||
d88aee68 | 279 | DBG("UST consumer add stream %s (key: %" PRIu64 ") with relayd id %" PRIu64, |
ffe60014 DG |
280 | stream->name, stream->key, stream->relayd_stream_id); |
281 | ||
282 | /* Set next CPU stream. */ | |
283 | channel->streams.count = ++cpu; | |
d88aee68 DG |
284 | |
285 | /* Keep stream reference when creating metadata. */ | |
286 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) { | |
287 | channel->metadata_stream = stream; | |
288 | } | |
ffe60014 DG |
289 | } |
290 | ||
291 | return 0; | |
292 | ||
293 | error: | |
294 | error_alloc: | |
295 | return ret; | |
296 | } | |
297 | ||
298 | /* | |
299 | * Create an UST channel with the given attributes and send it to the session | |
300 | * daemon using the ust ctl API. | |
301 | * | |
302 | * Return 0 on success or else a negative value. | |
303 | */ | |
304 | static int create_ust_channel(struct ustctl_consumer_channel_attr *attr, | |
305 | struct ustctl_consumer_channel **chanp) | |
306 | { | |
307 | int ret; | |
308 | struct ustctl_consumer_channel *channel; | |
309 | ||
310 | assert(attr); | |
311 | assert(chanp); | |
312 | ||
313 | DBG3("Creating channel to ustctl with attr: [overwrite: %d, " | |
314 | "subbuf_size: %" PRIu64 ", num_subbuf: %" PRIu64 ", " | |
315 | "switch_timer_interval: %u, read_timer_interval: %u, " | |
316 | "output: %d, type: %d", attr->overwrite, attr->subbuf_size, | |
317 | attr->num_subbuf, attr->switch_timer_interval, | |
318 | attr->read_timer_interval, attr->output, attr->type); | |
319 | ||
320 | channel = ustctl_create_channel(attr); | |
321 | if (!channel) { | |
322 | ret = -1; | |
323 | goto error_create; | |
324 | } | |
325 | ||
326 | *chanp = channel; | |
327 | ||
328 | return 0; | |
329 | ||
330 | error_create: | |
331 | return ret; | |
332 | } | |
333 | ||
d88aee68 DG |
334 | /* |
335 | * Send a single given stream to the session daemon using the sock. | |
336 | * | |
337 | * Return 0 on success else a negative value. | |
338 | */ | |
ffe60014 DG |
339 | static int send_sessiond_stream(int sock, struct lttng_consumer_stream *stream) |
340 | { | |
341 | int ret; | |
342 | ||
343 | assert(stream); | |
344 | assert(sock >= 0); | |
345 | ||
d88aee68 | 346 | DBG2("UST consumer sending stream %" PRIu64 " to sessiond", stream->key); |
ffe60014 DG |
347 | |
348 | /* Send stream to session daemon. */ | |
349 | ret = ustctl_send_stream_to_sessiond(sock, stream->ustream); | |
350 | if (ret < 0) { | |
351 | goto error; | |
352 | } | |
353 | ||
ffe60014 DG |
354 | error: |
355 | return ret; | |
356 | } | |
357 | ||
358 | /* | |
359 | * Send channel to sessiond. | |
360 | * | |
d88aee68 | 361 | * Return 0 on success or else a negative value. |
ffe60014 DG |
362 | */ |
363 | static int send_sessiond_channel(int sock, | |
364 | struct lttng_consumer_channel *channel, | |
365 | struct lttng_consumer_local_data *ctx, int *relayd_error) | |
366 | { | |
f2a444f1 | 367 | int ret, ret_code = LTTNG_OK; |
ffe60014 DG |
368 | struct lttng_consumer_stream *stream; |
369 | ||
370 | assert(channel); | |
371 | assert(ctx); | |
372 | assert(sock >= 0); | |
373 | ||
374 | DBG("UST consumer sending channel %s to sessiond", channel->name); | |
375 | ||
62285ea4 DG |
376 | if (channel->relayd_id != (uint64_t) -1ULL) { |
377 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
378 | /* Try to send the stream to the relayd if one is available. */ | |
379 | ret = consumer_send_relayd_stream(stream, stream->chan->pathname); | |
380 | if (ret < 0) { | |
381 | /* | |
382 | * Flag that the relayd was the problem here probably due to a | |
383 | * communicaton error on the socket. | |
384 | */ | |
385 | if (relayd_error) { | |
386 | *relayd_error = 1; | |
387 | } | |
388 | ret_code = LTTNG_ERR_RELAYD_CONNECT_FAIL; | |
ffe60014 | 389 | } |
ffe60014 | 390 | } |
f2a444f1 | 391 | } |
ffe60014 | 392 | |
f2a444f1 DG |
393 | /* Inform sessiond that we are about to send channel and streams. */ |
394 | ret = consumer_send_status_msg(sock, ret_code); | |
395 | if (ret < 0 || ret_code != LTTNG_OK) { | |
396 | /* | |
397 | * Either the session daemon is not responding or the relayd died so we | |
398 | * stop now. | |
399 | */ | |
400 | goto error; | |
401 | } | |
402 | ||
403 | /* Send channel to sessiond. */ | |
404 | ret = ustctl_send_channel_to_sessiond(sock, channel->uchan); | |
405 | if (ret < 0) { | |
406 | goto error; | |
407 | } | |
408 | ||
409 | ret = ustctl_channel_close_wakeup_fd(channel->uchan); | |
410 | if (ret < 0) { | |
411 | goto error; | |
412 | } | |
413 | ||
414 | /* The channel was sent successfully to the sessiond at this point. */ | |
415 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
ffe60014 DG |
416 | /* Send stream to session daemon. */ |
417 | ret = send_sessiond_stream(sock, stream); | |
418 | if (ret < 0) { | |
419 | goto error; | |
420 | } | |
421 | } | |
422 | ||
423 | /* Tell sessiond there is no more stream. */ | |
424 | ret = ustctl_send_stream_to_sessiond(sock, NULL); | |
425 | if (ret < 0) { | |
426 | goto error; | |
427 | } | |
428 | ||
429 | DBG("UST consumer NULL stream sent to sessiond"); | |
430 | ||
431 | return 0; | |
432 | ||
433 | error: | |
f2a444f1 DG |
434 | if (ret_code != LTTNG_OK) { |
435 | ret = -1; | |
436 | } | |
ffe60014 DG |
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) { | |
10a50311 | 476 | goto end; |
3bd1e081 MD |
477 | } |
478 | ||
d8ef542d MD |
479 | channel->wait_fd = ustctl_channel_get_wait_fd(channel->uchan); |
480 | ||
10a50311 JD |
481 | /* |
482 | * For the snapshots (no monitor), we create the metadata streams | |
483 | * on demand, not during the channel creation. | |
484 | */ | |
485 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && !channel->monitor) { | |
486 | ret = 0; | |
487 | goto end; | |
488 | } | |
489 | ||
ffe60014 DG |
490 | /* Open all streams for this channel. */ |
491 | ret = create_ust_streams(channel, ctx); | |
492 | if (ret < 0) { | |
10a50311 | 493 | goto end; |
ffe60014 DG |
494 | } |
495 | ||
10a50311 | 496 | end: |
3bd1e081 MD |
497 | return ret; |
498 | } | |
499 | ||
d88aee68 DG |
500 | /* |
501 | * Send all stream of a channel to the right thread handling it. | |
502 | * | |
503 | * On error, return a negative value else 0 on success. | |
504 | */ | |
505 | static int send_streams_to_thread(struct lttng_consumer_channel *channel, | |
506 | struct lttng_consumer_local_data *ctx) | |
507 | { | |
508 | int ret = 0; | |
509 | struct lttng_consumer_stream *stream, *stmp; | |
510 | ||
511 | assert(channel); | |
512 | assert(ctx); | |
513 | ||
514 | /* Send streams to the corresponding thread. */ | |
515 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
516 | send_node) { | |
517 | /* Sending the stream to the thread. */ | |
518 | ret = send_stream_to_thread(stream, ctx); | |
519 | if (ret < 0) { | |
520 | /* | |
521 | * If we are unable to send the stream to the thread, there is | |
522 | * a big problem so just stop everything. | |
523 | */ | |
524 | goto error; | |
525 | } | |
526 | ||
527 | /* Remove node from the channel stream list. */ | |
528 | cds_list_del(&stream->send_node); | |
4891ece8 DG |
529 | |
530 | /* | |
531 | * From this point on, the stream's ownership has been moved away from | |
532 | * the channel and becomes globally visible. | |
533 | */ | |
534 | stream->globally_visible = 1; | |
d88aee68 DG |
535 | } |
536 | ||
537 | error: | |
538 | return ret; | |
539 | } | |
540 | ||
541 | /* | |
542 | * Write metadata to the given channel using ustctl to convert the string to | |
543 | * the ringbuffer. | |
331744e3 JD |
544 | * Called only from consumer_metadata_cache_write. |
545 | * The metadata cache lock MUST be acquired to write in the cache. | |
d88aee68 DG |
546 | * |
547 | * Return 0 on success else a negative value. | |
548 | */ | |
331744e3 | 549 | int lttng_ustconsumer_push_metadata(struct lttng_consumer_channel *metadata, |
d88aee68 DG |
550 | const char *metadata_str, uint64_t target_offset, uint64_t len) |
551 | { | |
552 | int ret; | |
553 | ||
554 | assert(metadata); | |
555 | assert(metadata_str); | |
556 | ||
557 | DBG("UST consumer writing metadata to channel %s", metadata->name); | |
558 | ||
73811ecc DG |
559 | if (!metadata->metadata_stream) { |
560 | ret = 0; | |
561 | goto error; | |
562 | } | |
563 | ||
331744e3 JD |
564 | assert(target_offset <= metadata->metadata_cache->max_offset); |
565 | ret = ustctl_write_metadata_to_channel(metadata->uchan, | |
566 | metadata_str + target_offset, len); | |
d88aee68 | 567 | if (ret < 0) { |
8fd623e0 | 568 | ERR("ustctl write metadata fail with ret %d, len %" PRIu64, ret, len); |
d88aee68 DG |
569 | goto error; |
570 | } | |
d88aee68 DG |
571 | |
572 | ustctl_flush_buffer(metadata->metadata_stream->ustream, 1); | |
573 | ||
574 | error: | |
575 | return ret; | |
576 | } | |
577 | ||
7972aab2 DG |
578 | /* |
579 | * Flush channel's streams using the given key to retrieve the channel. | |
580 | * | |
581 | * Return 0 on success else an LTTng error code. | |
582 | */ | |
583 | static int flush_channel(uint64_t chan_key) | |
584 | { | |
585 | int ret = 0; | |
586 | struct lttng_consumer_channel *channel; | |
587 | struct lttng_consumer_stream *stream; | |
588 | struct lttng_ht *ht; | |
589 | struct lttng_ht_iter iter; | |
590 | ||
8fd623e0 | 591 | DBG("UST consumer flush channel key %" PRIu64, chan_key); |
7972aab2 | 592 | |
a500c257 | 593 | rcu_read_lock(); |
7972aab2 DG |
594 | channel = consumer_find_channel(chan_key); |
595 | if (!channel) { | |
8fd623e0 | 596 | ERR("UST consumer flush channel %" PRIu64 " not found", chan_key); |
7972aab2 DG |
597 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
598 | goto error; | |
599 | } | |
600 | ||
601 | ht = consumer_data.stream_per_chan_id_ht; | |
602 | ||
603 | /* For each stream of the channel id, flush it. */ | |
7972aab2 DG |
604 | cds_lfht_for_each_entry_duplicate(ht->ht, |
605 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
606 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
607 | ustctl_flush_buffer(stream->ustream, 1); | |
608 | } | |
7972aab2 | 609 | error: |
a500c257 | 610 | rcu_read_unlock(); |
7972aab2 DG |
611 | return ret; |
612 | } | |
613 | ||
d88aee68 DG |
614 | /* |
615 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. | |
a500c257 | 616 | * RCU read side lock MUST be acquired before calling this function. |
d88aee68 DG |
617 | * |
618 | * Return 0 on success else an LTTng error code. | |
619 | */ | |
620 | static int close_metadata(uint64_t chan_key) | |
621 | { | |
ea88ca2a | 622 | int ret = 0; |
d88aee68 DG |
623 | struct lttng_consumer_channel *channel; |
624 | ||
8fd623e0 | 625 | DBG("UST consumer close metadata key %" PRIu64, chan_key); |
d88aee68 DG |
626 | |
627 | channel = consumer_find_channel(chan_key); | |
628 | if (!channel) { | |
84cc9aa0 DG |
629 | /* |
630 | * This is possible if the metadata thread has issue a delete because | |
631 | * the endpoint point of the stream hung up. There is no way the | |
632 | * session daemon can know about it thus use a DBG instead of an actual | |
633 | * error. | |
634 | */ | |
635 | DBG("UST consumer close metadata %" PRIu64 " not found", chan_key); | |
d88aee68 DG |
636 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
637 | goto error; | |
638 | } | |
639 | ||
ea88ca2a | 640 | pthread_mutex_lock(&consumer_data.lock); |
73811ecc DG |
641 | |
642 | if (cds_lfht_is_node_deleted(&channel->node.node)) { | |
643 | goto error_unlock; | |
644 | } | |
645 | ||
646 | if (channel->switch_timer_enabled == 1) { | |
647 | DBG("Deleting timer on metadata channel"); | |
648 | consumer_timer_switch_stop(channel); | |
649 | } | |
650 | ||
651 | if (channel->metadata_stream) { | |
ea88ca2a MD |
652 | ret = ustctl_stream_close_wakeup_fd(channel->metadata_stream->ustream); |
653 | if (ret < 0) { | |
654 | ERR("UST consumer unable to close fd of metadata (ret: %d)", ret); | |
655 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
656 | goto error_unlock; | |
657 | } | |
331744e3 | 658 | } |
d88aee68 | 659 | |
ea88ca2a MD |
660 | error_unlock: |
661 | pthread_mutex_unlock(&consumer_data.lock); | |
d88aee68 DG |
662 | error: |
663 | return ret; | |
664 | } | |
665 | ||
666 | /* | |
667 | * RCU read side lock MUST be acquired before calling this function. | |
668 | * | |
669 | * Return 0 on success else an LTTng error code. | |
670 | */ | |
671 | static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key) | |
672 | { | |
673 | int ret; | |
674 | struct lttng_consumer_channel *metadata; | |
675 | ||
8fd623e0 | 676 | DBG("UST consumer setup metadata key %" PRIu64, key); |
d88aee68 DG |
677 | |
678 | metadata = consumer_find_channel(key); | |
679 | if (!metadata) { | |
680 | ERR("UST consumer push metadata %" PRIu64 " not found", key); | |
681 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
10a50311 JD |
682 | goto end; |
683 | } | |
684 | ||
685 | /* | |
686 | * In no monitor mode, the metadata channel has no stream(s) so skip the | |
687 | * ownership transfer to the metadata thread. | |
688 | */ | |
689 | if (!metadata->monitor) { | |
690 | DBG("Metadata channel in no monitor"); | |
691 | ret = 0; | |
692 | goto end; | |
d88aee68 DG |
693 | } |
694 | ||
695 | /* | |
696 | * Send metadata stream to relayd if one available. Availability is | |
697 | * known if the stream is still in the list of the channel. | |
698 | */ | |
699 | if (cds_list_empty(&metadata->streams.head)) { | |
700 | ERR("Metadata channel key %" PRIu64 ", no stream available.", key); | |
701 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
f5a0c9cf | 702 | goto error_no_stream; |
d88aee68 DG |
703 | } |
704 | ||
705 | /* Send metadata stream to relayd if needed. */ | |
62285ea4 DG |
706 | if (metadata->metadata_stream->net_seq_idx != (uint64_t) -1ULL) { |
707 | ret = consumer_send_relayd_stream(metadata->metadata_stream, | |
708 | metadata->pathname); | |
709 | if (ret < 0) { | |
710 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
711 | goto error; | |
712 | } | |
d88aee68 DG |
713 | } |
714 | ||
715 | ret = send_streams_to_thread(metadata, ctx); | |
716 | if (ret < 0) { | |
717 | /* | |
718 | * If we are unable to send the stream to the thread, there is | |
719 | * a big problem so just stop everything. | |
720 | */ | |
721 | ret = LTTCOMM_CONSUMERD_FATAL; | |
722 | goto error; | |
723 | } | |
724 | /* List MUST be empty after or else it could be reused. */ | |
725 | assert(cds_list_empty(&metadata->streams.head)); | |
726 | ||
10a50311 JD |
727 | ret = 0; |
728 | goto end; | |
d88aee68 DG |
729 | |
730 | error: | |
f2a444f1 DG |
731 | /* |
732 | * Delete metadata channel on error. At this point, the metadata stream can | |
733 | * NOT be monitored by the metadata thread thus having the guarantee that | |
734 | * the stream is still in the local stream list of the channel. This call | |
735 | * will make sure to clean that list. | |
736 | */ | |
f5a0c9cf DG |
737 | cds_list_del(&metadata->metadata_stream->send_node); |
738 | consumer_stream_destroy(metadata->metadata_stream, NULL); | |
739 | error_no_stream: | |
10a50311 JD |
740 | end: |
741 | return ret; | |
742 | } | |
743 | ||
744 | /* | |
745 | * Snapshot the whole metadata. | |
746 | * | |
747 | * Returns 0 on success, < 0 on error | |
748 | */ | |
749 | static int snapshot_metadata(uint64_t key, char *path, uint64_t relayd_id, | |
750 | struct lttng_consumer_local_data *ctx) | |
751 | { | |
752 | int ret = 0; | |
753 | ssize_t write_len; | |
754 | uint64_t total_len = 0; | |
755 | struct lttng_consumer_channel *metadata_channel; | |
756 | struct lttng_consumer_stream *metadata_stream; | |
757 | ||
758 | assert(path); | |
759 | assert(ctx); | |
760 | ||
761 | DBG("UST consumer snapshot metadata with key %" PRIu64 " at path %s", | |
762 | key, path); | |
763 | ||
764 | rcu_read_lock(); | |
765 | ||
766 | metadata_channel = consumer_find_channel(key); | |
767 | if (!metadata_channel) { | |
768 | ERR("UST snapshot metadata channel not found for key %lu", key); | |
769 | ret = -1; | |
770 | goto error; | |
771 | } | |
772 | assert(!metadata_channel->monitor); | |
773 | ||
774 | /* | |
775 | * Ask the sessiond if we have new metadata waiting and update the | |
776 | * consumer metadata cache. | |
777 | */ | |
778 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel); | |
779 | if (ret < 0) { | |
780 | goto error; | |
781 | } | |
782 | ||
783 | /* | |
784 | * The metadata stream is NOT created in no monitor mode when the channel | |
785 | * is created on a sessiond ask channel command. | |
786 | */ | |
787 | ret = create_ust_streams(metadata_channel, ctx); | |
788 | if (ret < 0) { | |
789 | goto error; | |
790 | } | |
791 | ||
792 | metadata_stream = metadata_channel->metadata_stream; | |
793 | assert(metadata_stream); | |
794 | ||
795 | if (relayd_id != (uint64_t) -1ULL) { | |
796 | metadata_stream->net_seq_idx = relayd_id; | |
797 | ret = consumer_send_relayd_stream(metadata_stream, path); | |
798 | if (ret < 0) { | |
799 | goto error_stream; | |
800 | } | |
801 | } else { | |
802 | ret = utils_create_stream_file(path, metadata_stream->name, | |
803 | metadata_stream->chan->tracefile_size, | |
804 | metadata_stream->tracefile_count_current, | |
805 | metadata_stream->uid, metadata_stream->gid); | |
806 | if (ret < 0) { | |
807 | goto error_stream; | |
808 | } | |
809 | metadata_stream->out_fd = ret; | |
810 | metadata_stream->tracefile_size_current = 0; | |
811 | } | |
812 | ||
813 | pthread_mutex_lock(&metadata_channel->metadata_cache->lock); | |
814 | while (total_len < metadata_channel->metadata_cache->total_bytes_written) { | |
815 | /* | |
816 | * Write at most one packet of metadata into the channel | |
817 | * to avoid blocking here. | |
818 | */ | |
819 | write_len = ustctl_write_one_packet_to_channel(metadata_channel->uchan, | |
820 | metadata_channel->metadata_cache->data, | |
821 | metadata_channel->metadata_cache->total_bytes_written); | |
822 | if (write_len < 0) { | |
823 | ERR("UST consumer snapshot writing metadata packet"); | |
824 | ret = -1; | |
825 | goto error_unlock; | |
826 | } | |
827 | total_len += write_len; | |
828 | ||
829 | DBG("Written %" PRIu64 " bytes to metadata (left: %" PRIu64 ")", | |
830 | write_len, | |
831 | metadata_channel->metadata_cache->total_bytes_written - write_len); | |
832 | ustctl_flush_buffer(metadata_stream->ustream, 1); | |
833 | ret = lttng_consumer_read_subbuffer(metadata_stream, ctx); | |
834 | if (ret < 0) { | |
835 | goto error_unlock; | |
836 | } | |
837 | } | |
838 | ||
839 | error_unlock: | |
840 | pthread_mutex_unlock(&metadata_channel->metadata_cache->lock); | |
841 | ||
842 | error_stream: | |
843 | /* | |
844 | * Clean up the stream completly because the next snapshot will use a new | |
845 | * metadata stream. | |
846 | */ | |
847 | cds_list_del(&metadata_stream->send_node); | |
848 | consumer_stream_destroy(metadata_stream, NULL); | |
849 | metadata_channel->metadata_stream = NULL; | |
850 | ||
851 | error: | |
852 | rcu_read_unlock(); | |
853 | return ret; | |
854 | } | |
855 | ||
856 | /* | |
857 | * Take a snapshot of all the stream of a channel. | |
858 | * | |
859 | * Returns 0 on success, < 0 on error | |
860 | */ | |
861 | static int snapshot_channel(uint64_t key, char *path, uint64_t relayd_id, | |
862 | struct lttng_consumer_local_data *ctx) | |
863 | { | |
864 | int ret; | |
865 | unsigned use_relayd = 0; | |
866 | unsigned long consumed_pos, produced_pos; | |
867 | struct lttng_consumer_channel *channel; | |
868 | struct lttng_consumer_stream *stream; | |
869 | ||
870 | assert(path); | |
871 | assert(ctx); | |
872 | ||
873 | rcu_read_lock(); | |
874 | ||
875 | if (relayd_id != (uint64_t) -1ULL) { | |
876 | use_relayd = 1; | |
877 | } | |
878 | ||
879 | channel = consumer_find_channel(key); | |
880 | if (!channel) { | |
881 | ERR("UST snapshot channel not found for key %lu", key); | |
882 | ret = -1; | |
883 | goto error; | |
884 | } | |
885 | assert(!channel->monitor); | |
886 | DBG("UST consumer snapshot channel %lu", key); | |
887 | ||
888 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
889 | /* Lock stream because we are about to change its state. */ | |
890 | pthread_mutex_lock(&stream->lock); | |
891 | stream->net_seq_idx = relayd_id; | |
892 | ||
893 | if (use_relayd) { | |
894 | ret = consumer_send_relayd_stream(stream, path); | |
895 | if (ret < 0) { | |
896 | goto error_unlock; | |
897 | } | |
898 | } else { | |
899 | ret = utils_create_stream_file(path, stream->name, | |
900 | stream->chan->tracefile_size, | |
901 | stream->tracefile_count_current, | |
902 | stream->uid, stream->gid); | |
903 | if (ret < 0) { | |
904 | goto error_unlock; | |
905 | } | |
906 | stream->out_fd = ret; | |
907 | stream->tracefile_size_current = 0; | |
908 | ||
909 | DBG("UST consumer snapshot stream %s/%s (%" PRIu64 ")", path, | |
910 | stream->name, stream->key); | |
911 | } | |
912 | ||
913 | ustctl_flush_buffer(stream->ustream, 1); | |
914 | ||
915 | ret = lttng_ustconsumer_take_snapshot(stream); | |
916 | if (ret < 0) { | |
917 | ERR("Taking UST snapshot"); | |
918 | goto error_unlock; | |
919 | } | |
920 | ||
921 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); | |
922 | if (ret < 0) { | |
923 | ERR("Produced UST snapshot position"); | |
924 | goto error_unlock; | |
925 | } | |
926 | ||
927 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
928 | if (ret < 0) { | |
929 | ERR("Consumerd UST snapshot position"); | |
930 | goto error_unlock; | |
931 | } | |
932 | ||
933 | while (consumed_pos < produced_pos) { | |
934 | ssize_t read_len; | |
935 | unsigned long len, padded_len; | |
936 | ||
937 | DBG("UST consumer taking snapshot at pos %lu", consumed_pos); | |
938 | ||
939 | ret = ustctl_get_subbuf(stream->ustream, &consumed_pos); | |
940 | if (ret < 0) { | |
941 | if (ret != -EAGAIN) { | |
942 | PERROR("ustctl_get_subbuf snapshot"); | |
943 | goto error_close_stream; | |
944 | } | |
945 | DBG("UST consumer get subbuf failed. Skipping it."); | |
946 | consumed_pos += stream->max_sb_size; | |
947 | continue; | |
948 | } | |
949 | ||
950 | ret = ustctl_get_subbuf_size(stream->ustream, &len); | |
951 | if (ret < 0) { | |
952 | ERR("Snapshot ustctl_get_subbuf_size"); | |
953 | goto error_put_subbuf; | |
954 | } | |
955 | ||
956 | ret = ustctl_get_padded_subbuf_size(stream->ustream, &padded_len); | |
957 | if (ret < 0) { | |
958 | ERR("Snapshot ustctl_get_padded_subbuf_size"); | |
959 | goto error_put_subbuf; | |
960 | } | |
961 | ||
962 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
963 | padded_len - len); | |
964 | if (use_relayd) { | |
965 | if (read_len != len) { | |
966 | ret = -1; | |
967 | goto error_put_subbuf; | |
968 | } | |
969 | } else { | |
970 | if (read_len != padded_len) { | |
971 | ret = -1; | |
972 | goto error_put_subbuf; | |
973 | } | |
974 | } | |
975 | ||
976 | ret = ustctl_put_subbuf(stream->ustream); | |
977 | if (ret < 0) { | |
978 | ERR("Snapshot ustctl_put_subbuf"); | |
979 | goto error_close_stream; | |
980 | } | |
981 | consumed_pos += stream->max_sb_size; | |
982 | } | |
983 | ||
984 | /* Simply close the stream so we can use it on the next snapshot. */ | |
985 | consumer_stream_close(stream); | |
986 | pthread_mutex_unlock(&stream->lock); | |
987 | } | |
988 | ||
989 | rcu_read_unlock(); | |
990 | return 0; | |
991 | ||
992 | error_put_subbuf: | |
993 | if (ustctl_put_subbuf(stream->ustream) < 0) { | |
994 | ERR("Snapshot ustctl_put_subbuf"); | |
995 | } | |
996 | error_close_stream: | |
997 | consumer_stream_close(stream); | |
998 | error_unlock: | |
999 | pthread_mutex_unlock(&stream->lock); | |
1000 | error: | |
1001 | rcu_read_unlock(); | |
d88aee68 DG |
1002 | return ret; |
1003 | } | |
1004 | ||
331744e3 JD |
1005 | /* |
1006 | * Receive the metadata updates from the sessiond. | |
1007 | */ | |
1008 | int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset, | |
1009 | uint64_t len, struct lttng_consumer_channel *channel) | |
1010 | { | |
1011 | int ret, ret_code = LTTNG_OK; | |
1012 | char *metadata_str; | |
1013 | ||
8fd623e0 | 1014 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len); |
331744e3 JD |
1015 | |
1016 | metadata_str = zmalloc(len * sizeof(char)); | |
1017 | if (!metadata_str) { | |
1018 | PERROR("zmalloc metadata string"); | |
1019 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; | |
1020 | goto end; | |
1021 | } | |
1022 | ||
1023 | /* Receive metadata string. */ | |
1024 | ret = lttcomm_recv_unix_sock(sock, metadata_str, len); | |
1025 | if (ret < 0) { | |
1026 | /* Session daemon is dead so return gracefully. */ | |
1027 | ret_code = ret; | |
1028 | goto end_free; | |
1029 | } | |
1030 | ||
73811ecc DG |
1031 | /* |
1032 | * XXX: The consumer data lock is acquired before calling metadata cache | |
1033 | * write which calls push metadata that MUST be protected by the consumer | |
1034 | * lock in order to be able to check the validity of the metadata stream of | |
1035 | * the channel. | |
1036 | * | |
1037 | * Note that this will be subject to change to better fine grained locking | |
1038 | * and ultimately try to get rid of this global consumer data lock. | |
1039 | */ | |
1040 | pthread_mutex_lock(&consumer_data.lock); | |
1041 | ||
331744e3 JD |
1042 | pthread_mutex_lock(&channel->metadata_cache->lock); |
1043 | ret = consumer_metadata_cache_write(channel, offset, len, metadata_str); | |
1044 | if (ret < 0) { | |
1045 | /* Unable to handle metadata. Notify session daemon. */ | |
1046 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
a32bd775 DG |
1047 | /* |
1048 | * Skip metadata flush on write error since the offset and len might | |
1049 | * not have been updated which could create an infinite loop below when | |
1050 | * waiting for the metadata cache to be flushed. | |
1051 | */ | |
1052 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
1053 | pthread_mutex_unlock(&consumer_data.lock); | |
1054 | goto end_free; | |
331744e3 JD |
1055 | } |
1056 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
73811ecc | 1057 | pthread_mutex_unlock(&consumer_data.lock); |
331744e3 JD |
1058 | |
1059 | while (consumer_metadata_cache_flushed(channel, offset + len)) { | |
1060 | DBG("Waiting for metadata to be flushed"); | |
1061 | usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME); | |
1062 | } | |
1063 | ||
1064 | end_free: | |
1065 | free(metadata_str); | |
1066 | end: | |
1067 | return ret_code; | |
1068 | } | |
1069 | ||
4cbc1a04 DG |
1070 | /* |
1071 | * Receive command from session daemon and process it. | |
1072 | * | |
1073 | * Return 1 on success else a negative value or 0. | |
1074 | */ | |
3bd1e081 MD |
1075 | int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
1076 | int sock, struct pollfd *consumer_sockpoll) | |
1077 | { | |
1078 | ssize_t ret; | |
f50f23d9 | 1079 | enum lttng_error_code ret_code = LTTNG_OK; |
3bd1e081 | 1080 | struct lttcomm_consumer_msg msg; |
ffe60014 | 1081 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 MD |
1082 | |
1083 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); | |
1084 | if (ret != sizeof(msg)) { | |
173af62f DG |
1085 | DBG("Consumer received unexpected message size %zd (expects %zu)", |
1086 | ret, sizeof(msg)); | |
3be74084 DG |
1087 | /* |
1088 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
1089 | * since the caller handles this. | |
1090 | */ | |
489f70e9 | 1091 | if (ret > 0) { |
c6857fcf | 1092 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
489f70e9 MD |
1093 | ret = -1; |
1094 | } | |
3bd1e081 MD |
1095 | return ret; |
1096 | } | |
1097 | if (msg.cmd_type == LTTNG_CONSUMER_STOP) { | |
f50f23d9 DG |
1098 | /* |
1099 | * Notify the session daemon that the command is completed. | |
1100 | * | |
1101 | * On transport layer error, the function call will print an error | |
1102 | * message so handling the returned code is a bit useless since we | |
1103 | * return an error code anyway. | |
1104 | */ | |
1105 | (void) consumer_send_status_msg(sock, ret_code); | |
3bd1e081 MD |
1106 | return -ENOENT; |
1107 | } | |
1108 | ||
3f8e211f | 1109 | /* relayd needs RCU read-side lock */ |
b0b335c8 MD |
1110 | rcu_read_lock(); |
1111 | ||
3bd1e081 | 1112 | switch (msg.cmd_type) { |
00e2e675 DG |
1113 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
1114 | { | |
f50f23d9 | 1115 | /* Session daemon status message are handled in the following call. */ |
7735ef9e DG |
1116 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
1117 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, | |
46e6455f | 1118 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id); |
00e2e675 DG |
1119 | goto end_nosignal; |
1120 | } | |
173af62f DG |
1121 | case LTTNG_CONSUMER_DESTROY_RELAYD: |
1122 | { | |
a6ba4fe1 | 1123 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
173af62f DG |
1124 | struct consumer_relayd_sock_pair *relayd; |
1125 | ||
a6ba4fe1 | 1126 | DBG("UST consumer destroying relayd %" PRIu64, index); |
173af62f DG |
1127 | |
1128 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 1129 | relayd = consumer_find_relayd(index); |
173af62f | 1130 | if (relayd == NULL) { |
3448e266 | 1131 | DBG("Unable to find relayd %" PRIu64, index); |
f50f23d9 | 1132 | ret_code = LTTNG_ERR_NO_CONSUMER; |
173af62f DG |
1133 | } |
1134 | ||
a6ba4fe1 DG |
1135 | /* |
1136 | * Each relayd socket pair has a refcount of stream attached to it | |
1137 | * which tells if the relayd is still active or not depending on the | |
1138 | * refcount value. | |
1139 | * | |
1140 | * This will set the destroy flag of the relayd object and destroy it | |
1141 | * if the refcount reaches zero when called. | |
1142 | * | |
1143 | * The destroy can happen either here or when a stream fd hangs up. | |
1144 | */ | |
f50f23d9 DG |
1145 | if (relayd) { |
1146 | consumer_flag_relayd_for_destroy(relayd); | |
1147 | } | |
1148 | ||
d88aee68 | 1149 | goto end_msg_sessiond; |
173af62f | 1150 | } |
3bd1e081 MD |
1151 | case LTTNG_CONSUMER_UPDATE_STREAM: |
1152 | { | |
3f8e211f | 1153 | rcu_read_unlock(); |
7ad0a0cb | 1154 | return -ENOSYS; |
3bd1e081 | 1155 | } |
6d805429 | 1156 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 1157 | { |
3be74084 | 1158 | int ret, is_data_pending; |
6d805429 | 1159 | uint64_t id = msg.u.data_pending.session_id; |
ca22feea | 1160 | |
6d805429 | 1161 | DBG("UST consumer data pending command for id %" PRIu64, id); |
ca22feea | 1162 | |
3be74084 | 1163 | is_data_pending = consumer_data_pending(id); |
ca22feea DG |
1164 | |
1165 | /* Send back returned value to session daemon */ | |
3be74084 DG |
1166 | ret = lttcomm_send_unix_sock(sock, &is_data_pending, |
1167 | sizeof(is_data_pending)); | |
ca22feea | 1168 | if (ret < 0) { |
3be74084 | 1169 | DBG("Error when sending the data pending ret code: %d", ret); |
489f70e9 | 1170 | goto error_fatal; |
ca22feea | 1171 | } |
f50f23d9 DG |
1172 | |
1173 | /* | |
1174 | * No need to send back a status message since the data pending | |
1175 | * returned value is the response. | |
1176 | */ | |
ca22feea | 1177 | break; |
53632229 | 1178 | } |
ffe60014 DG |
1179 | case LTTNG_CONSUMER_ASK_CHANNEL_CREATION: |
1180 | { | |
1181 | int ret; | |
1182 | struct ustctl_consumer_channel_attr attr; | |
1183 | ||
1184 | /* Create a plain object and reserve a channel key. */ | |
1185 | channel = allocate_channel(msg.u.ask_channel.session_id, | |
1186 | msg.u.ask_channel.pathname, msg.u.ask_channel.name, | |
1187 | msg.u.ask_channel.uid, msg.u.ask_channel.gid, | |
1188 | msg.u.ask_channel.relayd_id, msg.u.ask_channel.key, | |
1624d5b7 JD |
1189 | (enum lttng_event_output) msg.u.ask_channel.output, |
1190 | msg.u.ask_channel.tracefile_size, | |
2bba9e53 | 1191 | msg.u.ask_channel.tracefile_count, |
1950109e | 1192 | msg.u.ask_channel.session_id_per_pid, |
2bba9e53 | 1193 | msg.u.ask_channel.monitor); |
ffe60014 DG |
1194 | if (!channel) { |
1195 | goto end_channel_error; | |
1196 | } | |
1197 | ||
1198 | /* Build channel attributes from received message. */ | |
1199 | attr.subbuf_size = msg.u.ask_channel.subbuf_size; | |
1200 | attr.num_subbuf = msg.u.ask_channel.num_subbuf; | |
1201 | attr.overwrite = msg.u.ask_channel.overwrite; | |
1202 | attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval; | |
1203 | attr.read_timer_interval = msg.u.ask_channel.read_timer_interval; | |
7972aab2 | 1204 | attr.chan_id = msg.u.ask_channel.chan_id; |
10a50311 | 1205 | attr.output = msg.u.ask_channel.output; |
ffe60014 DG |
1206 | memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid)); |
1207 | ||
ffe60014 DG |
1208 | /* Translate and save channel type. */ |
1209 | switch (msg.u.ask_channel.type) { | |
1210 | case LTTNG_UST_CHAN_PER_CPU: | |
1211 | channel->type = CONSUMER_CHANNEL_TYPE_DATA; | |
1212 | attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8633d6e3 MD |
1213 | /* |
1214 | * Set refcount to 1 for owner. Below, we will | |
1215 | * pass ownership to the | |
1216 | * consumer_thread_channel_poll() thread. | |
1217 | */ | |
1218 | channel->refcount = 1; | |
ffe60014 DG |
1219 | break; |
1220 | case LTTNG_UST_CHAN_METADATA: | |
1221 | channel->type = CONSUMER_CHANNEL_TYPE_METADATA; | |
1222 | attr.type = LTTNG_UST_CHAN_METADATA; | |
1223 | break; | |
1224 | default: | |
1225 | assert(0); | |
1226 | goto error_fatal; | |
1227 | }; | |
1228 | ||
1229 | ret = ask_channel(ctx, sock, channel, &attr); | |
1230 | if (ret < 0) { | |
1231 | goto end_channel_error; | |
1232 | } | |
1233 | ||
fc643247 MD |
1234 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1235 | ret = consumer_metadata_cache_allocate(channel); | |
1236 | if (ret < 0) { | |
1237 | ERR("Allocating metadata cache"); | |
1238 | goto end_channel_error; | |
1239 | } | |
1240 | consumer_timer_switch_start(channel, attr.switch_timer_interval); | |
1241 | attr.switch_timer_interval = 0; | |
1242 | } | |
1243 | ||
ffe60014 DG |
1244 | /* |
1245 | * Add the channel to the internal state AFTER all streams were created | |
1246 | * and successfully sent to session daemon. This way, all streams must | |
1247 | * be ready before this channel is visible to the threads. | |
fc643247 MD |
1248 | * If add_channel succeeds, ownership of the channel is |
1249 | * passed to consumer_thread_channel_poll(). | |
ffe60014 DG |
1250 | */ |
1251 | ret = add_channel(channel, ctx); | |
1252 | if (ret < 0) { | |
ea88ca2a MD |
1253 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1254 | if (channel->switch_timer_enabled == 1) { | |
1255 | consumer_timer_switch_stop(channel); | |
1256 | } | |
1257 | consumer_metadata_cache_destroy(channel); | |
1258 | } | |
ffe60014 DG |
1259 | goto end_channel_error; |
1260 | } | |
1261 | ||
1262 | /* | |
1263 | * Channel and streams are now created. Inform the session daemon that | |
1264 | * everything went well and should wait to receive the channel and | |
1265 | * streams with ustctl API. | |
1266 | */ | |
1267 | ret = consumer_send_status_channel(sock, channel); | |
1268 | if (ret < 0) { | |
1269 | /* | |
489f70e9 | 1270 | * There is probably a problem on the socket. |
ffe60014 | 1271 | */ |
489f70e9 | 1272 | goto error_fatal; |
ffe60014 DG |
1273 | } |
1274 | ||
1275 | break; | |
1276 | } | |
1277 | case LTTNG_CONSUMER_GET_CHANNEL: | |
1278 | { | |
1279 | int ret, relayd_err = 0; | |
d88aee68 | 1280 | uint64_t key = msg.u.get_channel.key; |
ffe60014 | 1281 | struct lttng_consumer_channel *channel; |
ffe60014 DG |
1282 | |
1283 | channel = consumer_find_channel(key); | |
1284 | if (!channel) { | |
8fd623e0 | 1285 | ERR("UST consumer get channel key %" PRIu64 " not found", key); |
ffe60014 DG |
1286 | ret_code = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
1287 | goto end_msg_sessiond; | |
1288 | } | |
1289 | ||
ffe60014 DG |
1290 | /* Send everything to sessiond. */ |
1291 | ret = send_sessiond_channel(sock, channel, ctx, &relayd_err); | |
1292 | if (ret < 0) { | |
1293 | if (relayd_err) { | |
1294 | /* | |
1295 | * We were unable to send to the relayd the stream so avoid | |
1296 | * sending back a fatal error to the thread since this is OK | |
f2a444f1 DG |
1297 | * and the consumer can continue its work. The above call |
1298 | * has sent the error status message to the sessiond. | |
ffe60014 | 1299 | */ |
f2a444f1 | 1300 | goto end_nosignal; |
ffe60014 DG |
1301 | } |
1302 | /* | |
1303 | * The communicaton was broken hence there is a bad state between | |
1304 | * the consumer and sessiond so stop everything. | |
1305 | */ | |
1306 | goto error_fatal; | |
1307 | } | |
1308 | ||
10a50311 JD |
1309 | /* |
1310 | * In no monitor mode, the streams ownership is kept inside the channel | |
1311 | * so don't send them to the data thread. | |
1312 | */ | |
1313 | if (!channel->monitor) { | |
1314 | goto end_msg_sessiond; | |
1315 | } | |
1316 | ||
d88aee68 DG |
1317 | ret = send_streams_to_thread(channel, ctx); |
1318 | if (ret < 0) { | |
1319 | /* | |
1320 | * If we are unable to send the stream to the thread, there is | |
1321 | * a big problem so just stop everything. | |
1322 | */ | |
1323 | goto error_fatal; | |
ffe60014 | 1324 | } |
ffe60014 DG |
1325 | /* List MUST be empty after or else it could be reused. */ |
1326 | assert(cds_list_empty(&channel->streams.head)); | |
d88aee68 DG |
1327 | goto end_msg_sessiond; |
1328 | } | |
1329 | case LTTNG_CONSUMER_DESTROY_CHANNEL: | |
1330 | { | |
1331 | uint64_t key = msg.u.destroy_channel.key; | |
d88aee68 | 1332 | |
a0cbdd2e MD |
1333 | /* |
1334 | * Only called if streams have not been sent to stream | |
1335 | * manager thread. However, channel has been sent to | |
1336 | * channel manager thread. | |
1337 | */ | |
1338 | notify_thread_del_channel(ctx, key); | |
d88aee68 | 1339 | goto end_msg_sessiond; |
ffe60014 | 1340 | } |
d88aee68 DG |
1341 | case LTTNG_CONSUMER_CLOSE_METADATA: |
1342 | { | |
1343 | int ret; | |
1344 | ||
1345 | ret = close_metadata(msg.u.close_metadata.key); | |
1346 | if (ret != 0) { | |
1347 | ret_code = ret; | |
1348 | } | |
1349 | ||
1350 | goto end_msg_sessiond; | |
1351 | } | |
7972aab2 DG |
1352 | case LTTNG_CONSUMER_FLUSH_CHANNEL: |
1353 | { | |
1354 | int ret; | |
1355 | ||
1356 | ret = flush_channel(msg.u.flush_channel.key); | |
1357 | if (ret != 0) { | |
1358 | ret_code = ret; | |
1359 | } | |
1360 | ||
1361 | goto end_msg_sessiond; | |
1362 | } | |
d88aee68 | 1363 | case LTTNG_CONSUMER_PUSH_METADATA: |
ffe60014 DG |
1364 | { |
1365 | int ret; | |
d88aee68 | 1366 | uint64_t len = msg.u.push_metadata.len; |
d88aee68 | 1367 | uint64_t key = msg.u.push_metadata.key; |
331744e3 | 1368 | uint64_t offset = msg.u.push_metadata.target_offset; |
ffe60014 DG |
1369 | struct lttng_consumer_channel *channel; |
1370 | ||
8fd623e0 DG |
1371 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, |
1372 | len); | |
ffe60014 DG |
1373 | |
1374 | channel = consumer_find_channel(key); | |
1375 | if (!channel) { | |
8fd623e0 | 1376 | ERR("UST consumer push metadata %" PRIu64 " not found", key); |
ffe60014 | 1377 | ret_code = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
4a2eb0ca | 1378 | goto end_msg_sessiond; |
d88aee68 DG |
1379 | } |
1380 | ||
1381 | /* Tell session daemon we are ready to receive the metadata. */ | |
ffe60014 DG |
1382 | ret = consumer_send_status_msg(sock, LTTNG_OK); |
1383 | if (ret < 0) { | |
1384 | /* Somehow, the session daemon is not responding anymore. */ | |
d88aee68 DG |
1385 | goto error_fatal; |
1386 | } | |
1387 | ||
1388 | /* Wait for more data. */ | |
1389 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
489f70e9 | 1390 | goto error_fatal; |
d88aee68 DG |
1391 | } |
1392 | ||
331744e3 JD |
1393 | ret = lttng_ustconsumer_recv_metadata(sock, key, offset, |
1394 | len, channel); | |
d88aee68 | 1395 | if (ret < 0) { |
331744e3 | 1396 | /* error receiving from sessiond */ |
489f70e9 | 1397 | goto error_fatal; |
331744e3 JD |
1398 | } else { |
1399 | ret_code = ret; | |
d88aee68 DG |
1400 | goto end_msg_sessiond; |
1401 | } | |
d88aee68 DG |
1402 | } |
1403 | case LTTNG_CONSUMER_SETUP_METADATA: | |
1404 | { | |
1405 | int ret; | |
1406 | ||
1407 | ret = setup_metadata(ctx, msg.u.setup_metadata.key); | |
1408 | if (ret) { | |
1409 | ret_code = ret; | |
1410 | } | |
1411 | goto end_msg_sessiond; | |
ffe60014 | 1412 | } |
6dc3064a DG |
1413 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
1414 | { | |
10a50311 JD |
1415 | if (msg.u.snapshot_channel.metadata) { |
1416 | ret = snapshot_metadata(msg.u.snapshot_channel.key, | |
1417 | msg.u.snapshot_channel.pathname, | |
1418 | msg.u.snapshot_channel.relayd_id, | |
1419 | ctx); | |
1420 | if (ret < 0) { | |
1421 | ERR("Snapshot metadata failed"); | |
1422 | ret_code = LTTNG_ERR_UST_META_FAIL; | |
1423 | } | |
1424 | } else { | |
1425 | ret = snapshot_channel(msg.u.snapshot_channel.key, | |
1426 | msg.u.snapshot_channel.pathname, | |
1427 | msg.u.snapshot_channel.relayd_id, | |
1428 | ctx); | |
1429 | if (ret < 0) { | |
1430 | ERR("Snapshot channel failed"); | |
1431 | ret_code = LTTNG_ERR_UST_CHAN_FAIL; | |
1432 | } | |
1433 | } | |
1434 | ||
6dc3064a DG |
1435 | ret = consumer_send_status_msg(sock, ret_code); |
1436 | if (ret < 0) { | |
1437 | /* Somehow, the session daemon is not responding anymore. */ | |
1438 | goto end_nosignal; | |
1439 | } | |
1440 | break; | |
1441 | } | |
3bd1e081 MD |
1442 | default: |
1443 | break; | |
1444 | } | |
3f8e211f | 1445 | |
3bd1e081 | 1446 | end_nosignal: |
b0b335c8 | 1447 | rcu_read_unlock(); |
4cbc1a04 DG |
1448 | |
1449 | /* | |
1450 | * Return 1 to indicate success since the 0 value can be a socket | |
1451 | * shutdown during the recv() or send() call. | |
1452 | */ | |
1453 | return 1; | |
ffe60014 DG |
1454 | |
1455 | end_msg_sessiond: | |
1456 | /* | |
1457 | * The returned value here is not useful since either way we'll return 1 to | |
1458 | * the caller because the session daemon socket management is done | |
1459 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. | |
1460 | */ | |
489f70e9 MD |
1461 | ret = consumer_send_status_msg(sock, ret_code); |
1462 | if (ret < 0) { | |
1463 | goto error_fatal; | |
1464 | } | |
ffe60014 DG |
1465 | rcu_read_unlock(); |
1466 | return 1; | |
1467 | end_channel_error: | |
1468 | if (channel) { | |
1469 | /* | |
1470 | * Free channel here since no one has a reference to it. We don't | |
1471 | * free after that because a stream can store this pointer. | |
1472 | */ | |
1473 | destroy_channel(channel); | |
1474 | } | |
1475 | /* We have to send a status channel message indicating an error. */ | |
1476 | ret = consumer_send_status_channel(sock, NULL); | |
1477 | if (ret < 0) { | |
1478 | /* Stop everything if session daemon can not be notified. */ | |
1479 | goto error_fatal; | |
1480 | } | |
1481 | rcu_read_unlock(); | |
1482 | return 1; | |
1483 | error_fatal: | |
1484 | rcu_read_unlock(); | |
1485 | /* This will issue a consumer stop. */ | |
1486 | return -1; | |
3bd1e081 MD |
1487 | } |
1488 | ||
ffe60014 DG |
1489 | /* |
1490 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
1491 | * compiled out, we isolate it in this library. | |
1492 | */ | |
1493 | int lttng_ustctl_get_mmap_read_offset(struct lttng_consumer_stream *stream, | |
1494 | unsigned long *off) | |
3bd1e081 | 1495 | { |
ffe60014 DG |
1496 | assert(stream); |
1497 | assert(stream->ustream); | |
b5c5fc29 | 1498 | |
ffe60014 | 1499 | return ustctl_get_mmap_read_offset(stream->ustream, off); |
3bd1e081 MD |
1500 | } |
1501 | ||
ffe60014 DG |
1502 | /* |
1503 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
1504 | * compiled out, we isolate it in this library. | |
1505 | */ | |
1506 | void *lttng_ustctl_get_mmap_base(struct lttng_consumer_stream *stream) | |
d056b477 | 1507 | { |
ffe60014 DG |
1508 | assert(stream); |
1509 | assert(stream->ustream); | |
1510 | ||
1511 | return ustctl_get_mmap_base(stream->ustream); | |
d056b477 MD |
1512 | } |
1513 | ||
ffe60014 DG |
1514 | /* |
1515 | * Take a snapshot for a specific fd | |
1516 | * | |
1517 | * Returns 0 on success, < 0 on error | |
1518 | */ | |
1519 | int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream) | |
3bd1e081 | 1520 | { |
ffe60014 DG |
1521 | assert(stream); |
1522 | assert(stream->ustream); | |
1523 | ||
1524 | return ustctl_snapshot(stream->ustream); | |
3bd1e081 MD |
1525 | } |
1526 | ||
ffe60014 DG |
1527 | /* |
1528 | * Get the produced position | |
1529 | * | |
1530 | * Returns 0 on success, < 0 on error | |
1531 | */ | |
1532 | int lttng_ustconsumer_get_produced_snapshot( | |
1533 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
3bd1e081 | 1534 | { |
ffe60014 DG |
1535 | assert(stream); |
1536 | assert(stream->ustream); | |
1537 | assert(pos); | |
7a57cf92 | 1538 | |
ffe60014 DG |
1539 | return ustctl_snapshot_get_produced(stream->ustream, pos); |
1540 | } | |
7a57cf92 | 1541 | |
10a50311 JD |
1542 | /* |
1543 | * Get the consumed position | |
1544 | * | |
1545 | * Returns 0 on success, < 0 on error | |
1546 | */ | |
1547 | int lttng_ustconsumer_get_consumed_snapshot( | |
1548 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
1549 | { | |
1550 | assert(stream); | |
1551 | assert(stream->ustream); | |
1552 | assert(pos); | |
1553 | ||
1554 | return ustctl_snapshot_get_consumed(stream->ustream, pos); | |
1555 | } | |
1556 | ||
ffe60014 DG |
1557 | /* |
1558 | * Called when the stream signal the consumer that it has hang up. | |
1559 | */ | |
1560 | void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream) | |
1561 | { | |
1562 | assert(stream); | |
1563 | assert(stream->ustream); | |
2c1dd183 | 1564 | |
ffe60014 DG |
1565 | ustctl_flush_buffer(stream->ustream, 0); |
1566 | stream->hangup_flush_done = 1; | |
1567 | } | |
ee77a7b0 | 1568 | |
ffe60014 DG |
1569 | void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan) |
1570 | { | |
1571 | assert(chan); | |
1572 | assert(chan->uchan); | |
e316aad5 | 1573 | |
ea88ca2a MD |
1574 | if (chan->switch_timer_enabled == 1) { |
1575 | consumer_timer_switch_stop(chan); | |
1576 | } | |
1577 | consumer_metadata_cache_destroy(chan); | |
ffe60014 | 1578 | ustctl_destroy_channel(chan->uchan); |
3bd1e081 MD |
1579 | } |
1580 | ||
1581 | void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream) | |
1582 | { | |
ffe60014 DG |
1583 | assert(stream); |
1584 | assert(stream->ustream); | |
d41f73b7 | 1585 | |
ea88ca2a MD |
1586 | if (stream->chan->switch_timer_enabled == 1) { |
1587 | consumer_timer_switch_stop(stream->chan); | |
1588 | } | |
ffe60014 DG |
1589 | ustctl_destroy_stream(stream->ustream); |
1590 | } | |
d41f73b7 MD |
1591 | |
1592 | int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream, | |
1593 | struct lttng_consumer_local_data *ctx) | |
1594 | { | |
1d4dfdef | 1595 | unsigned long len, subbuf_size, padding; |
d41f73b7 MD |
1596 | int err; |
1597 | long ret = 0; | |
d41f73b7 | 1598 | char dummy; |
ffe60014 DG |
1599 | struct ustctl_consumer_stream *ustream; |
1600 | ||
1601 | assert(stream); | |
1602 | assert(stream->ustream); | |
1603 | assert(ctx); | |
d41f73b7 | 1604 | |
ffe60014 DG |
1605 | DBG2("In UST read_subbuffer (wait_fd: %d, name: %s)", stream->wait_fd, |
1606 | stream->name); | |
1607 | ||
1608 | /* Ease our life for what's next. */ | |
1609 | ustream = stream->ustream; | |
d41f73b7 MD |
1610 | |
1611 | /* We can consume the 1 byte written into the wait_fd by UST */ | |
effcf122 | 1612 | if (!stream->hangup_flush_done) { |
c617c0c6 MD |
1613 | ssize_t readlen; |
1614 | ||
effcf122 MD |
1615 | do { |
1616 | readlen = read(stream->wait_fd, &dummy, 1); | |
87dc6a9c | 1617 | } while (readlen == -1 && errno == EINTR); |
effcf122 MD |
1618 | if (readlen == -1) { |
1619 | ret = readlen; | |
1620 | goto end; | |
1621 | } | |
d41f73b7 MD |
1622 | } |
1623 | ||
d41f73b7 | 1624 | /* Get the next subbuffer */ |
ffe60014 | 1625 | err = ustctl_get_next_subbuf(ustream); |
d41f73b7 | 1626 | if (err != 0) { |
1d4dfdef | 1627 | ret = err; /* ustctl_get_next_subbuf returns negative, caller expect positive. */ |
d41f73b7 MD |
1628 | /* |
1629 | * This is a debug message even for single-threaded consumer, | |
1630 | * because poll() have more relaxed criterions than get subbuf, | |
1631 | * so get_subbuf may fail for short race windows where poll() | |
1632 | * would issue wakeups. | |
1633 | */ | |
1634 | DBG("Reserving sub buffer failed (everything is normal, " | |
ffe60014 | 1635 | "it is due to concurrency) [ret: %d]", err); |
d41f73b7 MD |
1636 | goto end; |
1637 | } | |
ffe60014 | 1638 | assert(stream->chan->output == CONSUMER_CHANNEL_MMAP); |
1d4dfdef | 1639 | /* Get the full padded subbuffer size */ |
ffe60014 | 1640 | err = ustctl_get_padded_subbuf_size(ustream, &len); |
effcf122 | 1641 | assert(err == 0); |
1d4dfdef DG |
1642 | |
1643 | /* Get subbuffer data size (without padding) */ | |
ffe60014 | 1644 | err = ustctl_get_subbuf_size(ustream, &subbuf_size); |
1d4dfdef DG |
1645 | assert(err == 0); |
1646 | ||
1647 | /* Make sure we don't get a subbuffer size bigger than the padded */ | |
1648 | assert(len >= subbuf_size); | |
1649 | ||
1650 | padding = len - subbuf_size; | |
d41f73b7 | 1651 | /* write the subbuffer to the tracefile */ |
1d4dfdef | 1652 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, padding); |
91dfef6e DG |
1653 | /* |
1654 | * The mmap operation should write subbuf_size amount of data when network | |
1655 | * streaming or the full padding (len) size when we are _not_ streaming. | |
1656 | */ | |
d88aee68 DG |
1657 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
1658 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
d41f73b7 | 1659 | /* |
91dfef6e | 1660 | * Display the error but continue processing to try to release the |
c5c45efa DG |
1661 | * subbuffer. This is a DBG statement since any unexpected kill or |
1662 | * signal, the application gets unregistered, relayd gets closed or | |
1663 | * anything that affects the buffer lifetime will trigger this error. | |
1664 | * So, for the sake of the user, don't print this error since it can | |
1665 | * happen and it is OK with the code flow. | |
d41f73b7 | 1666 | */ |
c5c45efa | 1667 | DBG("Error writing to tracefile " |
8fd623e0 | 1668 | "(ret: %ld != len: %lu != subbuf_size: %lu)", |
91dfef6e | 1669 | ret, len, subbuf_size); |
d41f73b7 | 1670 | } |
ffe60014 | 1671 | err = ustctl_put_next_subbuf(ustream); |
effcf122 | 1672 | assert(err == 0); |
331744e3 | 1673 | |
d41f73b7 MD |
1674 | end: |
1675 | return ret; | |
1676 | } | |
1677 | ||
ffe60014 DG |
1678 | /* |
1679 | * Called when a stream is created. | |
fe4477ee JD |
1680 | * |
1681 | * Return 0 on success or else a negative value. | |
ffe60014 | 1682 | */ |
d41f73b7 MD |
1683 | int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream) |
1684 | { | |
fe4477ee JD |
1685 | int ret; |
1686 | ||
10a50311 JD |
1687 | assert(stream); |
1688 | ||
fe4477ee | 1689 | /* Don't create anything if this is set for streaming. */ |
10a50311 | 1690 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { |
fe4477ee JD |
1691 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
1692 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
1693 | stream->uid, stream->gid); | |
1694 | if (ret < 0) { | |
1695 | goto error; | |
1696 | } | |
1697 | stream->out_fd = ret; | |
1698 | stream->tracefile_size_current = 0; | |
1699 | } | |
1700 | ret = 0; | |
1701 | ||
1702 | error: | |
1703 | return ret; | |
d41f73b7 | 1704 | } |
ca22feea DG |
1705 | |
1706 | /* | |
1707 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
1708 | * stream. Consumer data lock MUST be acquired before calling this function |
1709 | * and the stream lock. | |
ca22feea | 1710 | * |
6d805429 | 1711 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
1712 | * data is available for trace viewer reading. |
1713 | */ | |
6d805429 | 1714 | int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
1715 | { |
1716 | int ret; | |
1717 | ||
1718 | assert(stream); | |
ffe60014 | 1719 | assert(stream->ustream); |
ca22feea | 1720 | |
6d805429 | 1721 | DBG("UST consumer checking data pending"); |
c8f59ee5 | 1722 | |
ffe60014 | 1723 | ret = ustctl_get_next_subbuf(stream->ustream); |
ca22feea DG |
1724 | if (ret == 0) { |
1725 | /* There is still data so let's put back this subbuffer. */ | |
ffe60014 | 1726 | ret = ustctl_put_subbuf(stream->ustream); |
ca22feea | 1727 | assert(ret == 0); |
6d805429 | 1728 | ret = 1; /* Data is pending */ |
4e9a4686 | 1729 | goto end; |
ca22feea DG |
1730 | } |
1731 | ||
6d805429 DG |
1732 | /* Data is NOT pending so ready to be read. */ |
1733 | ret = 0; | |
ca22feea | 1734 | |
6efae65e DG |
1735 | end: |
1736 | return ret; | |
ca22feea | 1737 | } |
d88aee68 DG |
1738 | |
1739 | /* | |
1740 | * Close every metadata stream wait fd of the metadata hash table. This | |
1741 | * function MUST be used very carefully so not to run into a race between the | |
1742 | * metadata thread handling streams and this function closing their wait fd. | |
1743 | * | |
1744 | * For UST, this is used when the session daemon hangs up. Its the metadata | |
1745 | * producer so calling this is safe because we are assured that no state change | |
1746 | * can occur in the metadata thread for the streams in the hash table. | |
1747 | */ | |
1748 | void lttng_ustconsumer_close_metadata(struct lttng_ht *metadata_ht) | |
1749 | { | |
1750 | int ret; | |
1751 | struct lttng_ht_iter iter; | |
1752 | struct lttng_consumer_stream *stream; | |
1753 | ||
1754 | assert(metadata_ht); | |
1755 | assert(metadata_ht->ht); | |
1756 | ||
1757 | DBG("UST consumer closing all metadata streams"); | |
1758 | ||
1759 | rcu_read_lock(); | |
1760 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, | |
1761 | node.node) { | |
1762 | int fd = stream->wait_fd; | |
1763 | ||
1764 | /* | |
1765 | * Whatever happens here we have to continue to try to close every | |
1766 | * streams. Let's report at least the error on failure. | |
1767 | */ | |
1768 | ret = ustctl_stream_close_wakeup_fd(stream->ustream); | |
1769 | if (ret) { | |
1770 | ERR("Unable to close metadata stream fd %d ret %d", fd, ret); | |
1771 | } | |
1772 | DBG("Metadata wait fd %d closed", fd); | |
1773 | } | |
1774 | rcu_read_unlock(); | |
1775 | } | |
d8ef542d MD |
1776 | |
1777 | void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream) | |
1778 | { | |
1779 | int ret; | |
1780 | ||
1781 | ret = ustctl_stream_close_wakeup_fd(stream->ustream); | |
1782 | if (ret < 0) { | |
1783 | ERR("Unable to close wakeup fd"); | |
1784 | } | |
1785 | } | |
331744e3 JD |
1786 | |
1787 | int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx, | |
1788 | struct lttng_consumer_channel *channel) | |
1789 | { | |
1790 | struct lttcomm_metadata_request_msg request; | |
1791 | struct lttcomm_consumer_msg msg; | |
1792 | enum lttng_error_code ret_code = LTTNG_OK; | |
1793 | uint64_t len, key, offset; | |
1794 | int ret; | |
1795 | ||
1796 | assert(channel); | |
1797 | assert(channel->metadata_cache); | |
1798 | ||
1799 | /* send the metadata request to sessiond */ | |
1800 | switch (consumer_data.type) { | |
1801 | case LTTNG_CONSUMER64_UST: | |
1802 | request.bits_per_long = 64; | |
1803 | break; | |
1804 | case LTTNG_CONSUMER32_UST: | |
1805 | request.bits_per_long = 32; | |
1806 | break; | |
1807 | default: | |
1808 | request.bits_per_long = 0; | |
1809 | break; | |
1810 | } | |
1811 | ||
1812 | request.session_id = channel->session_id; | |
1950109e | 1813 | request.session_id_per_pid = channel->session_id_per_pid; |
331744e3 JD |
1814 | request.uid = channel->uid; |
1815 | request.key = channel->key; | |
1950109e JD |
1816 | DBG("Sending metadata request to sessiond, session id %" PRIu64 |
1817 | ", per-pid %" PRIu64, | |
1818 | channel->session_id, | |
1819 | channel->session_id_per_pid); | |
331744e3 JD |
1820 | |
1821 | ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request, | |
1822 | sizeof(request)); | |
1823 | if (ret < 0) { | |
1824 | ERR("Asking metadata to sessiond"); | |
1825 | goto end; | |
1826 | } | |
1827 | ||
1828 | /* Receive the metadata from sessiond */ | |
1829 | ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg, | |
1830 | sizeof(msg)); | |
1831 | if (ret != sizeof(msg)) { | |
8fd623e0 | 1832 | DBG("Consumer received unexpected message size %d (expects %zu)", |
331744e3 JD |
1833 | ret, sizeof(msg)); |
1834 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); | |
1835 | /* | |
1836 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
1837 | * since the caller handles this. | |
1838 | */ | |
1839 | goto end; | |
1840 | } | |
1841 | ||
1842 | if (msg.cmd_type == LTTNG_ERR_UND) { | |
1843 | /* No registry found */ | |
1844 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, | |
1845 | ret_code); | |
1846 | ret = 0; | |
1847 | goto end; | |
1848 | } else if (msg.cmd_type != LTTNG_CONSUMER_PUSH_METADATA) { | |
1849 | ERR("Unexpected cmd_type received %d", msg.cmd_type); | |
1850 | ret = -1; | |
1851 | goto end; | |
1852 | } | |
1853 | ||
1854 | len = msg.u.push_metadata.len; | |
1855 | key = msg.u.push_metadata.key; | |
1856 | offset = msg.u.push_metadata.target_offset; | |
1857 | ||
1858 | assert(key == channel->key); | |
1859 | if (len == 0) { | |
1860 | DBG("No new metadata to receive for key %" PRIu64, key); | |
1861 | } | |
1862 | ||
1863 | /* Tell session daemon we are ready to receive the metadata. */ | |
1864 | ret = consumer_send_status_msg(ctx->consumer_metadata_socket, | |
1865 | LTTNG_OK); | |
1866 | if (ret < 0 || len == 0) { | |
1867 | /* | |
1868 | * Somehow, the session daemon is not responding anymore or there is | |
1869 | * nothing to receive. | |
1870 | */ | |
1871 | goto end; | |
1872 | } | |
1873 | ||
1874 | ret_code = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket, | |
1875 | key, offset, len, channel); | |
f2a444f1 DG |
1876 | if (ret_code >= 0) { |
1877 | /* | |
1878 | * Only send the status msg if the sessiond is alive meaning a positive | |
1879 | * ret code. | |
1880 | */ | |
1881 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret_code); | |
1882 | } | |
331744e3 JD |
1883 | ret = 0; |
1884 | ||
1885 | end: | |
1886 | return ret; | |
1887 | } |