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 | |
51a9e1c7 | 35 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 36 | #include <common/common.h> |
10a8a223 | 37 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 38 | #include <common/relayd/relayd.h> |
dbb5dfe6 | 39 | #include <common/compat/fcntl.h> |
331744e3 | 40 | #include <common/consumer-metadata-cache.h> |
10a50311 | 41 | #include <common/consumer-stream.h> |
331744e3 | 42 | #include <common/consumer-timer.h> |
fe4477ee | 43 | #include <common/utils.h> |
309167d2 | 44 | #include <common/index/index.h> |
10a8a223 DG |
45 | |
46 | #include "ust-consumer.h" | |
3bd1e081 MD |
47 | |
48 | extern struct lttng_consumer_global_data consumer_data; | |
49 | extern int consumer_poll_timeout; | |
50 | extern volatile int consumer_quit; | |
51 | ||
52 | /* | |
ffe60014 DG |
53 | * Free channel object and all streams associated with it. This MUST be used |
54 | * only and only if the channel has _NEVER_ been added to the global channel | |
55 | * hash table. | |
3bd1e081 | 56 | */ |
ffe60014 | 57 | static void destroy_channel(struct lttng_consumer_channel *channel) |
3bd1e081 | 58 | { |
ffe60014 DG |
59 | struct lttng_consumer_stream *stream, *stmp; |
60 | ||
61 | assert(channel); | |
62 | ||
63 | DBG("UST consumer cleaning stream list"); | |
64 | ||
65 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
66 | send_node) { | |
9ce5646a MD |
67 | |
68 | health_code_update(); | |
69 | ||
ffe60014 DG |
70 | cds_list_del(&stream->send_node); |
71 | ustctl_destroy_stream(stream->ustream); | |
72 | free(stream); | |
73 | } | |
74 | ||
75 | /* | |
76 | * If a channel is available meaning that was created before the streams | |
77 | * were, delete it. | |
78 | */ | |
79 | if (channel->uchan) { | |
80 | lttng_ustconsumer_del_channel(channel); | |
81 | } | |
82 | free(channel); | |
83 | } | |
3bd1e081 MD |
84 | |
85 | /* | |
ffe60014 | 86 | * Add channel to internal consumer state. |
3bd1e081 | 87 | * |
ffe60014 | 88 | * Returns 0 on success or else a negative value. |
3bd1e081 | 89 | */ |
ffe60014 DG |
90 | static int add_channel(struct lttng_consumer_channel *channel, |
91 | struct lttng_consumer_local_data *ctx) | |
3bd1e081 MD |
92 | { |
93 | int ret = 0; | |
94 | ||
ffe60014 DG |
95 | assert(channel); |
96 | assert(ctx); | |
97 | ||
98 | if (ctx->on_recv_channel != NULL) { | |
99 | ret = ctx->on_recv_channel(channel); | |
100 | if (ret == 0) { | |
d8ef542d | 101 | ret = consumer_add_channel(channel, ctx); |
ffe60014 DG |
102 | } else if (ret < 0) { |
103 | /* Most likely an ENOMEM. */ | |
104 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
105 | goto error; | |
106 | } | |
107 | } else { | |
d8ef542d | 108 | ret = consumer_add_channel(channel, ctx); |
3bd1e081 MD |
109 | } |
110 | ||
d88aee68 | 111 | DBG("UST consumer channel added (key: %" PRIu64 ")", channel->key); |
ffe60014 DG |
112 | |
113 | error: | |
3bd1e081 MD |
114 | return ret; |
115 | } | |
116 | ||
117 | /* | |
ffe60014 DG |
118 | * Allocate and return a consumer channel object. |
119 | */ | |
120 | static struct lttng_consumer_channel *allocate_channel(uint64_t session_id, | |
121 | const char *pathname, const char *name, uid_t uid, gid_t gid, | |
da009f2c | 122 | uint64_t relayd_id, uint64_t key, enum lttng_event_output output, |
2bba9e53 | 123 | uint64_t tracefile_size, uint64_t tracefile_count, |
ecc48a90 JD |
124 | uint64_t session_id_per_pid, unsigned int monitor, |
125 | unsigned int live_timer_interval) | |
ffe60014 DG |
126 | { |
127 | assert(pathname); | |
128 | assert(name); | |
129 | ||
1950109e JD |
130 | return consumer_allocate_channel(key, session_id, pathname, name, uid, |
131 | gid, relayd_id, output, tracefile_size, | |
ecc48a90 | 132 | tracefile_count, session_id_per_pid, monitor, live_timer_interval); |
ffe60014 DG |
133 | } |
134 | ||
135 | /* | |
136 | * Allocate and return a consumer stream object. If _alloc_ret is not NULL, the | |
137 | * error value if applicable is set in it else it is kept untouched. | |
3bd1e081 | 138 | * |
ffe60014 | 139 | * Return NULL on error else the newly allocated stream object. |
3bd1e081 | 140 | */ |
ffe60014 DG |
141 | static struct lttng_consumer_stream *allocate_stream(int cpu, int key, |
142 | struct lttng_consumer_channel *channel, | |
143 | struct lttng_consumer_local_data *ctx, int *_alloc_ret) | |
144 | { | |
145 | int alloc_ret; | |
146 | struct lttng_consumer_stream *stream = NULL; | |
147 | ||
148 | assert(channel); | |
149 | assert(ctx); | |
150 | ||
151 | stream = consumer_allocate_stream(channel->key, | |
152 | key, | |
153 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
154 | channel->name, | |
155 | channel->uid, | |
156 | channel->gid, | |
157 | channel->relayd_id, | |
158 | channel->session_id, | |
159 | cpu, | |
160 | &alloc_ret, | |
4891ece8 DG |
161 | channel->type, |
162 | channel->monitor); | |
ffe60014 DG |
163 | if (stream == NULL) { |
164 | switch (alloc_ret) { | |
165 | case -ENOENT: | |
166 | /* | |
167 | * We could not find the channel. Can happen if cpu hotplug | |
168 | * happens while tearing down. | |
169 | */ | |
170 | DBG3("Could not find channel"); | |
171 | break; | |
172 | case -ENOMEM: | |
173 | case -EINVAL: | |
174 | default: | |
175 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
176 | break; | |
177 | } | |
178 | goto error; | |
179 | } | |
180 | ||
181 | stream->chan = channel; | |
182 | ||
183 | error: | |
184 | if (_alloc_ret) { | |
185 | *_alloc_ret = alloc_ret; | |
186 | } | |
187 | return stream; | |
188 | } | |
189 | ||
190 | /* | |
191 | * Send the given stream pointer to the corresponding thread. | |
192 | * | |
193 | * Returns 0 on success else a negative value. | |
194 | */ | |
195 | static int send_stream_to_thread(struct lttng_consumer_stream *stream, | |
196 | struct lttng_consumer_local_data *ctx) | |
197 | { | |
dae10966 DG |
198 | int ret; |
199 | struct lttng_pipe *stream_pipe; | |
ffe60014 DG |
200 | |
201 | /* Get the right pipe where the stream will be sent. */ | |
202 | if (stream->metadata_flag) { | |
5ab66908 MD |
203 | ret = consumer_add_metadata_stream(stream); |
204 | if (ret) { | |
205 | ERR("Consumer add metadata stream %" PRIu64 " failed.", | |
206 | stream->key); | |
207 | goto error; | |
208 | } | |
dae10966 | 209 | stream_pipe = ctx->consumer_metadata_pipe; |
ffe60014 | 210 | } else { |
5ab66908 MD |
211 | ret = consumer_add_data_stream(stream); |
212 | if (ret) { | |
213 | ERR("Consumer add stream %" PRIu64 " failed.", | |
214 | stream->key); | |
215 | goto error; | |
216 | } | |
dae10966 | 217 | stream_pipe = ctx->consumer_data_pipe; |
ffe60014 DG |
218 | } |
219 | ||
5ab66908 MD |
220 | /* |
221 | * From this point on, the stream's ownership has been moved away from | |
222 | * the channel and becomes globally visible. | |
223 | */ | |
224 | stream->globally_visible = 1; | |
225 | ||
dae10966 | 226 | ret = lttng_pipe_write(stream_pipe, &stream, sizeof(stream)); |
ffe60014 | 227 | if (ret < 0) { |
dae10966 DG |
228 | ERR("Consumer write %s stream to pipe %d", |
229 | stream->metadata_flag ? "metadata" : "data", | |
230 | lttng_pipe_get_writefd(stream_pipe)); | |
5ab66908 MD |
231 | if (stream->metadata_flag) { |
232 | consumer_del_stream_for_metadata(stream); | |
233 | } else { | |
234 | consumer_del_stream_for_data(stream); | |
235 | } | |
ffe60014 | 236 | } |
5ab66908 | 237 | error: |
ffe60014 DG |
238 | return ret; |
239 | } | |
240 | ||
d88aee68 DG |
241 | /* |
242 | * Create streams for the given channel using liblttng-ust-ctl. | |
243 | * | |
244 | * Return 0 on success else a negative value. | |
245 | */ | |
ffe60014 DG |
246 | static int create_ust_streams(struct lttng_consumer_channel *channel, |
247 | struct lttng_consumer_local_data *ctx) | |
248 | { | |
249 | int ret, cpu = 0; | |
250 | struct ustctl_consumer_stream *ustream; | |
251 | struct lttng_consumer_stream *stream; | |
252 | ||
253 | assert(channel); | |
254 | assert(ctx); | |
255 | ||
256 | /* | |
257 | * While a stream is available from ustctl. When NULL is returned, we've | |
258 | * reached the end of the possible stream for the channel. | |
259 | */ | |
260 | while ((ustream = ustctl_create_stream(channel->uchan, cpu))) { | |
261 | int wait_fd; | |
04ef1097 | 262 | int ust_metadata_pipe[2]; |
ffe60014 | 263 | |
9ce5646a MD |
264 | health_code_update(); |
265 | ||
04ef1097 MD |
266 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && channel->monitor) { |
267 | ret = utils_create_pipe_cloexec_nonblock(ust_metadata_pipe); | |
268 | if (ret < 0) { | |
269 | ERR("Create ust metadata poll pipe"); | |
270 | goto error; | |
271 | } | |
272 | wait_fd = ust_metadata_pipe[0]; | |
273 | } else { | |
274 | wait_fd = ustctl_stream_get_wait_fd(ustream); | |
275 | } | |
ffe60014 DG |
276 | |
277 | /* Allocate consumer stream object. */ | |
278 | stream = allocate_stream(cpu, wait_fd, channel, ctx, &ret); | |
279 | if (!stream) { | |
280 | goto error_alloc; | |
281 | } | |
282 | stream->ustream = ustream; | |
283 | /* | |
284 | * Store it so we can save multiple function calls afterwards since | |
285 | * this value is used heavily in the stream threads. This is UST | |
286 | * specific so this is why it's done after allocation. | |
287 | */ | |
288 | stream->wait_fd = wait_fd; | |
289 | ||
b31398bb DG |
290 | /* |
291 | * Increment channel refcount since the channel reference has now been | |
292 | * assigned in the allocation process above. | |
293 | */ | |
10a50311 JD |
294 | if (stream->chan->monitor) { |
295 | uatomic_inc(&stream->chan->refcount); | |
296 | } | |
b31398bb | 297 | |
ffe60014 DG |
298 | /* |
299 | * Order is important this is why a list is used. On error, the caller | |
300 | * should clean this list. | |
301 | */ | |
302 | cds_list_add_tail(&stream->send_node, &channel->streams.head); | |
303 | ||
304 | ret = ustctl_get_max_subbuf_size(stream->ustream, | |
305 | &stream->max_sb_size); | |
306 | if (ret < 0) { | |
307 | ERR("ustctl_get_max_subbuf_size failed for stream %s", | |
308 | stream->name); | |
309 | goto error; | |
310 | } | |
311 | ||
312 | /* Do actions once stream has been received. */ | |
313 | if (ctx->on_recv_stream) { | |
314 | ret = ctx->on_recv_stream(stream); | |
315 | if (ret < 0) { | |
316 | goto error; | |
317 | } | |
318 | } | |
319 | ||
d88aee68 | 320 | DBG("UST consumer add stream %s (key: %" PRIu64 ") with relayd id %" PRIu64, |
ffe60014 DG |
321 | stream->name, stream->key, stream->relayd_stream_id); |
322 | ||
323 | /* Set next CPU stream. */ | |
324 | channel->streams.count = ++cpu; | |
d88aee68 DG |
325 | |
326 | /* Keep stream reference when creating metadata. */ | |
327 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) { | |
328 | channel->metadata_stream = stream; | |
04ef1097 MD |
329 | stream->ust_metadata_poll_pipe[0] = ust_metadata_pipe[0]; |
330 | stream->ust_metadata_poll_pipe[1] = ust_metadata_pipe[1]; | |
d88aee68 | 331 | } |
ffe60014 DG |
332 | } |
333 | ||
334 | return 0; | |
335 | ||
336 | error: | |
337 | error_alloc: | |
338 | return ret; | |
339 | } | |
340 | ||
341 | /* | |
342 | * Create an UST channel with the given attributes and send it to the session | |
343 | * daemon using the ust ctl API. | |
344 | * | |
345 | * Return 0 on success or else a negative value. | |
346 | */ | |
347 | static int create_ust_channel(struct ustctl_consumer_channel_attr *attr, | |
348 | struct ustctl_consumer_channel **chanp) | |
349 | { | |
350 | int ret; | |
351 | struct ustctl_consumer_channel *channel; | |
352 | ||
353 | assert(attr); | |
354 | assert(chanp); | |
355 | ||
356 | DBG3("Creating channel to ustctl with attr: [overwrite: %d, " | |
357 | "subbuf_size: %" PRIu64 ", num_subbuf: %" PRIu64 ", " | |
358 | "switch_timer_interval: %u, read_timer_interval: %u, " | |
359 | "output: %d, type: %d", attr->overwrite, attr->subbuf_size, | |
360 | attr->num_subbuf, attr->switch_timer_interval, | |
361 | attr->read_timer_interval, attr->output, attr->type); | |
362 | ||
363 | channel = ustctl_create_channel(attr); | |
364 | if (!channel) { | |
365 | ret = -1; | |
366 | goto error_create; | |
367 | } | |
368 | ||
369 | *chanp = channel; | |
370 | ||
371 | return 0; | |
372 | ||
373 | error_create: | |
374 | return ret; | |
375 | } | |
376 | ||
d88aee68 DG |
377 | /* |
378 | * Send a single given stream to the session daemon using the sock. | |
379 | * | |
380 | * Return 0 on success else a negative value. | |
381 | */ | |
ffe60014 DG |
382 | static int send_sessiond_stream(int sock, struct lttng_consumer_stream *stream) |
383 | { | |
384 | int ret; | |
385 | ||
386 | assert(stream); | |
387 | assert(sock >= 0); | |
388 | ||
3eb914c0 | 389 | DBG("UST consumer sending stream %" PRIu64 " to sessiond", stream->key); |
ffe60014 DG |
390 | |
391 | /* Send stream to session daemon. */ | |
392 | ret = ustctl_send_stream_to_sessiond(sock, stream->ustream); | |
393 | if (ret < 0) { | |
394 | goto error; | |
395 | } | |
396 | ||
ffe60014 DG |
397 | error: |
398 | return ret; | |
399 | } | |
400 | ||
401 | /* | |
402 | * Send channel to sessiond. | |
403 | * | |
d88aee68 | 404 | * Return 0 on success or else a negative value. |
ffe60014 DG |
405 | */ |
406 | static int send_sessiond_channel(int sock, | |
407 | struct lttng_consumer_channel *channel, | |
408 | struct lttng_consumer_local_data *ctx, int *relayd_error) | |
409 | { | |
0c759fc9 | 410 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
ffe60014 | 411 | struct lttng_consumer_stream *stream; |
a4baae1b | 412 | uint64_t net_seq_idx = -1ULL; |
ffe60014 DG |
413 | |
414 | assert(channel); | |
415 | assert(ctx); | |
416 | assert(sock >= 0); | |
417 | ||
418 | DBG("UST consumer sending channel %s to sessiond", channel->name); | |
419 | ||
62285ea4 DG |
420 | if (channel->relayd_id != (uint64_t) -1ULL) { |
421 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
422 | |
423 | health_code_update(); | |
424 | ||
62285ea4 DG |
425 | /* Try to send the stream to the relayd if one is available. */ |
426 | ret = consumer_send_relayd_stream(stream, stream->chan->pathname); | |
427 | if (ret < 0) { | |
428 | /* | |
429 | * Flag that the relayd was the problem here probably due to a | |
430 | * communicaton error on the socket. | |
431 | */ | |
432 | if (relayd_error) { | |
433 | *relayd_error = 1; | |
434 | } | |
435 | ret_code = LTTNG_ERR_RELAYD_CONNECT_FAIL; | |
ffe60014 | 436 | } |
a4baae1b JD |
437 | if (net_seq_idx == -1ULL) { |
438 | net_seq_idx = stream->net_seq_idx; | |
439 | } | |
440 | } | |
441 | ret = consumer_send_relayd_streams_sent(net_seq_idx); | |
442 | if (ret < 0) { | |
443 | /* | |
444 | * Flag that the relayd was the problem here probably due to a | |
445 | * communicaton error on the socket. | |
446 | */ | |
447 | if (relayd_error) { | |
448 | *relayd_error = 1; | |
449 | } | |
450 | ret_code = LTTNG_ERR_RELAYD_CONNECT_FAIL; | |
ffe60014 | 451 | } |
f2a444f1 | 452 | } |
ffe60014 | 453 | |
f2a444f1 DG |
454 | /* Inform sessiond that we are about to send channel and streams. */ |
455 | ret = consumer_send_status_msg(sock, ret_code); | |
0c759fc9 | 456 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
457 | /* |
458 | * Either the session daemon is not responding or the relayd died so we | |
459 | * stop now. | |
460 | */ | |
461 | goto error; | |
462 | } | |
463 | ||
464 | /* Send channel to sessiond. */ | |
465 | ret = ustctl_send_channel_to_sessiond(sock, channel->uchan); | |
466 | if (ret < 0) { | |
467 | goto error; | |
468 | } | |
469 | ||
470 | ret = ustctl_channel_close_wakeup_fd(channel->uchan); | |
471 | if (ret < 0) { | |
472 | goto error; | |
473 | } | |
474 | ||
475 | /* The channel was sent successfully to the sessiond at this point. */ | |
476 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
477 | |
478 | health_code_update(); | |
479 | ||
ffe60014 DG |
480 | /* Send stream to session daemon. */ |
481 | ret = send_sessiond_stream(sock, stream); | |
482 | if (ret < 0) { | |
483 | goto error; | |
484 | } | |
485 | } | |
486 | ||
487 | /* Tell sessiond there is no more stream. */ | |
488 | ret = ustctl_send_stream_to_sessiond(sock, NULL); | |
489 | if (ret < 0) { | |
490 | goto error; | |
491 | } | |
492 | ||
493 | DBG("UST consumer NULL stream sent to sessiond"); | |
494 | ||
495 | return 0; | |
496 | ||
497 | error: | |
0c759fc9 | 498 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
499 | ret = -1; |
500 | } | |
ffe60014 DG |
501 | return ret; |
502 | } | |
503 | ||
504 | /* | |
505 | * Creates a channel and streams and add the channel it to the channel internal | |
506 | * state. The created stream must ONLY be sent once the GET_CHANNEL command is | |
507 | * received. | |
508 | * | |
509 | * Return 0 on success or else, a negative value is returned and the channel | |
510 | * MUST be destroyed by consumer_del_channel(). | |
511 | */ | |
512 | static int ask_channel(struct lttng_consumer_local_data *ctx, int sock, | |
513 | struct lttng_consumer_channel *channel, | |
514 | struct ustctl_consumer_channel_attr *attr) | |
3bd1e081 MD |
515 | { |
516 | int ret; | |
517 | ||
ffe60014 DG |
518 | assert(ctx); |
519 | assert(channel); | |
520 | assert(attr); | |
521 | ||
522 | /* | |
523 | * This value is still used by the kernel consumer since for the kernel, | |
524 | * the stream ownership is not IN the consumer so we need to have the | |
525 | * number of left stream that needs to be initialized so we can know when | |
526 | * to delete the channel (see consumer.c). | |
527 | * | |
528 | * As for the user space tracer now, the consumer creates and sends the | |
529 | * stream to the session daemon which only sends them to the application | |
530 | * once every stream of a channel is received making this value useless | |
531 | * because we they will be added to the poll thread before the application | |
532 | * receives them. This ensures that a stream can not hang up during | |
533 | * initilization of a channel. | |
534 | */ | |
535 | channel->nb_init_stream_left = 0; | |
536 | ||
537 | /* The reply msg status is handled in the following call. */ | |
538 | ret = create_ust_channel(attr, &channel->uchan); | |
539 | if (ret < 0) { | |
10a50311 | 540 | goto end; |
3bd1e081 MD |
541 | } |
542 | ||
d8ef542d MD |
543 | channel->wait_fd = ustctl_channel_get_wait_fd(channel->uchan); |
544 | ||
10a50311 JD |
545 | /* |
546 | * For the snapshots (no monitor), we create the metadata streams | |
547 | * on demand, not during the channel creation. | |
548 | */ | |
549 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && !channel->monitor) { | |
550 | ret = 0; | |
551 | goto end; | |
552 | } | |
553 | ||
ffe60014 DG |
554 | /* Open all streams for this channel. */ |
555 | ret = create_ust_streams(channel, ctx); | |
556 | if (ret < 0) { | |
10a50311 | 557 | goto end; |
ffe60014 DG |
558 | } |
559 | ||
10a50311 | 560 | end: |
3bd1e081 MD |
561 | return ret; |
562 | } | |
563 | ||
d88aee68 DG |
564 | /* |
565 | * Send all stream of a channel to the right thread handling it. | |
566 | * | |
567 | * On error, return a negative value else 0 on success. | |
568 | */ | |
569 | static int send_streams_to_thread(struct lttng_consumer_channel *channel, | |
570 | struct lttng_consumer_local_data *ctx) | |
571 | { | |
572 | int ret = 0; | |
573 | struct lttng_consumer_stream *stream, *stmp; | |
574 | ||
575 | assert(channel); | |
576 | assert(ctx); | |
577 | ||
578 | /* Send streams to the corresponding thread. */ | |
579 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
580 | send_node) { | |
9ce5646a MD |
581 | |
582 | health_code_update(); | |
583 | ||
d88aee68 DG |
584 | /* Sending the stream to the thread. */ |
585 | ret = send_stream_to_thread(stream, ctx); | |
586 | if (ret < 0) { | |
587 | /* | |
588 | * If we are unable to send the stream to the thread, there is | |
589 | * a big problem so just stop everything. | |
590 | */ | |
5ab66908 MD |
591 | /* Remove node from the channel stream list. */ |
592 | cds_list_del(&stream->send_node); | |
d88aee68 DG |
593 | goto error; |
594 | } | |
595 | ||
596 | /* Remove node from the channel stream list. */ | |
597 | cds_list_del(&stream->send_node); | |
4891ece8 | 598 | |
d88aee68 DG |
599 | } |
600 | ||
601 | error: | |
602 | return ret; | |
603 | } | |
604 | ||
7972aab2 DG |
605 | /* |
606 | * Flush channel's streams using the given key to retrieve the channel. | |
607 | * | |
608 | * Return 0 on success else an LTTng error code. | |
609 | */ | |
610 | static int flush_channel(uint64_t chan_key) | |
611 | { | |
612 | int ret = 0; | |
613 | struct lttng_consumer_channel *channel; | |
614 | struct lttng_consumer_stream *stream; | |
615 | struct lttng_ht *ht; | |
616 | struct lttng_ht_iter iter; | |
617 | ||
8fd623e0 | 618 | DBG("UST consumer flush channel key %" PRIu64, chan_key); |
7972aab2 | 619 | |
a500c257 | 620 | rcu_read_lock(); |
7972aab2 DG |
621 | channel = consumer_find_channel(chan_key); |
622 | if (!channel) { | |
8fd623e0 | 623 | ERR("UST consumer flush channel %" PRIu64 " not found", chan_key); |
7972aab2 DG |
624 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
625 | goto error; | |
626 | } | |
627 | ||
628 | ht = consumer_data.stream_per_chan_id_ht; | |
629 | ||
630 | /* For each stream of the channel id, flush it. */ | |
7972aab2 DG |
631 | cds_lfht_for_each_entry_duplicate(ht->ht, |
632 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
633 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
9ce5646a MD |
634 | |
635 | health_code_update(); | |
636 | ||
b8086166 | 637 | ustctl_flush_buffer(stream->ustream, 1); |
7972aab2 | 638 | } |
7972aab2 | 639 | error: |
a500c257 | 640 | rcu_read_unlock(); |
7972aab2 DG |
641 | return ret; |
642 | } | |
be2b50c7 DG |
643 | /* |
644 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. | |
645 | * RCU read side lock MUST be acquired before calling this function. | |
646 | * | |
647 | * NOTE: This function does NOT take any channel nor stream lock. | |
648 | * | |
649 | * Return 0 on success else LTTng error code. | |
650 | */ | |
651 | static int _close_metadata(struct lttng_consumer_channel *channel) | |
652 | { | |
0c759fc9 | 653 | int ret = LTTCOMM_CONSUMERD_SUCCESS; |
be2b50c7 DG |
654 | |
655 | assert(channel); | |
656 | assert(channel->type == CONSUMER_CHANNEL_TYPE_METADATA); | |
657 | ||
658 | if (channel->switch_timer_enabled == 1) { | |
659 | DBG("Deleting timer on metadata channel"); | |
660 | consumer_timer_switch_stop(channel); | |
661 | } | |
662 | ||
663 | if (channel->metadata_stream) { | |
664 | ret = ustctl_stream_close_wakeup_fd(channel->metadata_stream->ustream); | |
665 | if (ret < 0) { | |
666 | ERR("UST consumer unable to close fd of metadata (ret: %d)", ret); | |
667 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
668 | } | |
669 | ||
670 | if (channel->monitor) { | |
671 | /* Close the read-side in consumer_del_metadata_stream */ | |
672 | ret = close(channel->metadata_stream->ust_metadata_poll_pipe[1]); | |
673 | if (ret < 0) { | |
674 | PERROR("Close UST metadata write-side poll pipe"); | |
675 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
676 | } | |
677 | } | |
678 | } | |
679 | ||
680 | return ret; | |
681 | } | |
7972aab2 | 682 | |
d88aee68 DG |
683 | /* |
684 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. | |
a500c257 | 685 | * RCU read side lock MUST be acquired before calling this function. |
d88aee68 DG |
686 | * |
687 | * Return 0 on success else an LTTng error code. | |
688 | */ | |
689 | static int close_metadata(uint64_t chan_key) | |
690 | { | |
ea88ca2a | 691 | int ret = 0; |
d88aee68 DG |
692 | struct lttng_consumer_channel *channel; |
693 | ||
8fd623e0 | 694 | DBG("UST consumer close metadata key %" PRIu64, chan_key); |
d88aee68 DG |
695 | |
696 | channel = consumer_find_channel(chan_key); | |
697 | if (!channel) { | |
84cc9aa0 DG |
698 | /* |
699 | * This is possible if the metadata thread has issue a delete because | |
700 | * the endpoint point of the stream hung up. There is no way the | |
701 | * session daemon can know about it thus use a DBG instead of an actual | |
702 | * error. | |
703 | */ | |
704 | DBG("UST consumer close metadata %" PRIu64 " not found", chan_key); | |
d88aee68 DG |
705 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
706 | goto error; | |
707 | } | |
708 | ||
ea88ca2a | 709 | pthread_mutex_lock(&consumer_data.lock); |
a9838785 | 710 | pthread_mutex_lock(&channel->lock); |
73811ecc DG |
711 | |
712 | if (cds_lfht_is_node_deleted(&channel->node.node)) { | |
713 | goto error_unlock; | |
714 | } | |
715 | ||
be2b50c7 | 716 | ret = _close_metadata(channel); |
d88aee68 | 717 | |
ea88ca2a | 718 | error_unlock: |
a9838785 | 719 | pthread_mutex_unlock(&channel->lock); |
ea88ca2a | 720 | pthread_mutex_unlock(&consumer_data.lock); |
d88aee68 DG |
721 | error: |
722 | return ret; | |
723 | } | |
724 | ||
725 | /* | |
726 | * RCU read side lock MUST be acquired before calling this function. | |
727 | * | |
728 | * Return 0 on success else an LTTng error code. | |
729 | */ | |
730 | static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key) | |
731 | { | |
732 | int ret; | |
733 | struct lttng_consumer_channel *metadata; | |
734 | ||
8fd623e0 | 735 | DBG("UST consumer setup metadata key %" PRIu64, key); |
d88aee68 DG |
736 | |
737 | metadata = consumer_find_channel(key); | |
738 | if (!metadata) { | |
739 | ERR("UST consumer push metadata %" PRIu64 " not found", key); | |
740 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
10a50311 JD |
741 | goto end; |
742 | } | |
743 | ||
744 | /* | |
745 | * In no monitor mode, the metadata channel has no stream(s) so skip the | |
746 | * ownership transfer to the metadata thread. | |
747 | */ | |
748 | if (!metadata->monitor) { | |
749 | DBG("Metadata channel in no monitor"); | |
750 | ret = 0; | |
751 | goto end; | |
d88aee68 DG |
752 | } |
753 | ||
754 | /* | |
755 | * Send metadata stream to relayd if one available. Availability is | |
756 | * known if the stream is still in the list of the channel. | |
757 | */ | |
758 | if (cds_list_empty(&metadata->streams.head)) { | |
759 | ERR("Metadata channel key %" PRIu64 ", no stream available.", key); | |
760 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
f5a0c9cf | 761 | goto error_no_stream; |
d88aee68 DG |
762 | } |
763 | ||
764 | /* Send metadata stream to relayd if needed. */ | |
62285ea4 DG |
765 | if (metadata->metadata_stream->net_seq_idx != (uint64_t) -1ULL) { |
766 | ret = consumer_send_relayd_stream(metadata->metadata_stream, | |
767 | metadata->pathname); | |
768 | if (ret < 0) { | |
769 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
770 | goto error; | |
771 | } | |
d88aee68 DG |
772 | } |
773 | ||
774 | ret = send_streams_to_thread(metadata, ctx); | |
775 | if (ret < 0) { | |
776 | /* | |
777 | * If we are unable to send the stream to the thread, there is | |
778 | * a big problem so just stop everything. | |
779 | */ | |
780 | ret = LTTCOMM_CONSUMERD_FATAL; | |
781 | goto error; | |
782 | } | |
783 | /* List MUST be empty after or else it could be reused. */ | |
784 | assert(cds_list_empty(&metadata->streams.head)); | |
785 | ||
10a50311 JD |
786 | ret = 0; |
787 | goto end; | |
d88aee68 DG |
788 | |
789 | error: | |
f2a444f1 DG |
790 | /* |
791 | * Delete metadata channel on error. At this point, the metadata stream can | |
792 | * NOT be monitored by the metadata thread thus having the guarantee that | |
793 | * the stream is still in the local stream list of the channel. This call | |
794 | * will make sure to clean that list. | |
795 | */ | |
f5a0c9cf DG |
796 | cds_list_del(&metadata->metadata_stream->send_node); |
797 | consumer_stream_destroy(metadata->metadata_stream, NULL); | |
798 | error_no_stream: | |
10a50311 JD |
799 | end: |
800 | return ret; | |
801 | } | |
802 | ||
803 | /* | |
804 | * Snapshot the whole metadata. | |
805 | * | |
806 | * Returns 0 on success, < 0 on error | |
807 | */ | |
808 | static int snapshot_metadata(uint64_t key, char *path, uint64_t relayd_id, | |
809 | struct lttng_consumer_local_data *ctx) | |
810 | { | |
811 | int ret = 0; | |
10a50311 JD |
812 | struct lttng_consumer_channel *metadata_channel; |
813 | struct lttng_consumer_stream *metadata_stream; | |
814 | ||
815 | assert(path); | |
816 | assert(ctx); | |
817 | ||
818 | DBG("UST consumer snapshot metadata with key %" PRIu64 " at path %s", | |
819 | key, path); | |
820 | ||
821 | rcu_read_lock(); | |
822 | ||
823 | metadata_channel = consumer_find_channel(key); | |
824 | if (!metadata_channel) { | |
6a00837f MD |
825 | ERR("UST snapshot metadata channel not found for key %" PRIu64, |
826 | key); | |
10a50311 JD |
827 | ret = -1; |
828 | goto error; | |
829 | } | |
830 | assert(!metadata_channel->monitor); | |
831 | ||
9ce5646a MD |
832 | health_code_update(); |
833 | ||
10a50311 JD |
834 | /* |
835 | * Ask the sessiond if we have new metadata waiting and update the | |
836 | * consumer metadata cache. | |
837 | */ | |
94d49140 | 838 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 1); |
10a50311 JD |
839 | if (ret < 0) { |
840 | goto error; | |
841 | } | |
842 | ||
9ce5646a MD |
843 | health_code_update(); |
844 | ||
10a50311 JD |
845 | /* |
846 | * The metadata stream is NOT created in no monitor mode when the channel | |
847 | * is created on a sessiond ask channel command. | |
848 | */ | |
849 | ret = create_ust_streams(metadata_channel, ctx); | |
850 | if (ret < 0) { | |
851 | goto error; | |
852 | } | |
853 | ||
854 | metadata_stream = metadata_channel->metadata_stream; | |
855 | assert(metadata_stream); | |
856 | ||
857 | if (relayd_id != (uint64_t) -1ULL) { | |
858 | metadata_stream->net_seq_idx = relayd_id; | |
859 | ret = consumer_send_relayd_stream(metadata_stream, path); | |
860 | if (ret < 0) { | |
861 | goto error_stream; | |
862 | } | |
863 | } else { | |
864 | ret = utils_create_stream_file(path, metadata_stream->name, | |
865 | metadata_stream->chan->tracefile_size, | |
866 | metadata_stream->tracefile_count_current, | |
309167d2 | 867 | metadata_stream->uid, metadata_stream->gid, NULL); |
10a50311 JD |
868 | if (ret < 0) { |
869 | goto error_stream; | |
870 | } | |
871 | metadata_stream->out_fd = ret; | |
872 | metadata_stream->tracefile_size_current = 0; | |
873 | } | |
874 | ||
04ef1097 | 875 | do { |
9ce5646a MD |
876 | health_code_update(); |
877 | ||
10a50311 JD |
878 | ret = lttng_consumer_read_subbuffer(metadata_stream, ctx); |
879 | if (ret < 0) { | |
94d49140 | 880 | goto error_stream; |
10a50311 | 881 | } |
04ef1097 | 882 | } while (ret > 0); |
10a50311 | 883 | |
10a50311 JD |
884 | error_stream: |
885 | /* | |
886 | * Clean up the stream completly because the next snapshot will use a new | |
887 | * metadata stream. | |
888 | */ | |
889 | cds_list_del(&metadata_stream->send_node); | |
890 | consumer_stream_destroy(metadata_stream, NULL); | |
891 | metadata_channel->metadata_stream = NULL; | |
892 | ||
893 | error: | |
894 | rcu_read_unlock(); | |
895 | return ret; | |
896 | } | |
897 | ||
898 | /* | |
899 | * Take a snapshot of all the stream of a channel. | |
900 | * | |
901 | * Returns 0 on success, < 0 on error | |
902 | */ | |
903 | static int snapshot_channel(uint64_t key, char *path, uint64_t relayd_id, | |
5c786ded | 904 | uint64_t max_stream_size, struct lttng_consumer_local_data *ctx) |
10a50311 JD |
905 | { |
906 | int ret; | |
907 | unsigned use_relayd = 0; | |
908 | unsigned long consumed_pos, produced_pos; | |
909 | struct lttng_consumer_channel *channel; | |
910 | struct lttng_consumer_stream *stream; | |
911 | ||
912 | assert(path); | |
913 | assert(ctx); | |
914 | ||
915 | rcu_read_lock(); | |
916 | ||
917 | if (relayd_id != (uint64_t) -1ULL) { | |
918 | use_relayd = 1; | |
919 | } | |
920 | ||
921 | channel = consumer_find_channel(key); | |
922 | if (!channel) { | |
6a00837f | 923 | ERR("UST snapshot channel not found for key %" PRIu64, key); |
10a50311 JD |
924 | ret = -1; |
925 | goto error; | |
926 | } | |
927 | assert(!channel->monitor); | |
6a00837f | 928 | DBG("UST consumer snapshot channel %" PRIu64, key); |
10a50311 JD |
929 | |
930 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
931 | |
932 | health_code_update(); | |
933 | ||
10a50311 JD |
934 | /* Lock stream because we are about to change its state. */ |
935 | pthread_mutex_lock(&stream->lock); | |
936 | stream->net_seq_idx = relayd_id; | |
937 | ||
938 | if (use_relayd) { | |
939 | ret = consumer_send_relayd_stream(stream, path); | |
940 | if (ret < 0) { | |
941 | goto error_unlock; | |
942 | } | |
943 | } else { | |
944 | ret = utils_create_stream_file(path, stream->name, | |
945 | stream->chan->tracefile_size, | |
946 | stream->tracefile_count_current, | |
309167d2 | 947 | stream->uid, stream->gid, NULL); |
10a50311 JD |
948 | if (ret < 0) { |
949 | goto error_unlock; | |
950 | } | |
951 | stream->out_fd = ret; | |
952 | stream->tracefile_size_current = 0; | |
953 | ||
954 | DBG("UST consumer snapshot stream %s/%s (%" PRIu64 ")", path, | |
955 | stream->name, stream->key); | |
956 | } | |
a4baae1b JD |
957 | if (relayd_id != -1ULL) { |
958 | ret = consumer_send_relayd_streams_sent(relayd_id); | |
959 | if (ret < 0) { | |
960 | goto error_unlock; | |
961 | } | |
962 | } | |
10a50311 JD |
963 | |
964 | ustctl_flush_buffer(stream->ustream, 1); | |
965 | ||
966 | ret = lttng_ustconsumer_take_snapshot(stream); | |
967 | if (ret < 0) { | |
968 | ERR("Taking UST snapshot"); | |
969 | goto error_unlock; | |
970 | } | |
971 | ||
972 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); | |
973 | if (ret < 0) { | |
974 | ERR("Produced UST snapshot position"); | |
975 | goto error_unlock; | |
976 | } | |
977 | ||
978 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
979 | if (ret < 0) { | |
980 | ERR("Consumerd UST snapshot position"); | |
981 | goto error_unlock; | |
982 | } | |
983 | ||
5c786ded JD |
984 | /* |
985 | * The original value is sent back if max stream size is larger than | |
986 | * the possible size of the snapshot. Also, we asume that the session | |
987 | * daemon should never send a maximum stream size that is lower than | |
988 | * subbuffer size. | |
989 | */ | |
990 | consumed_pos = consumer_get_consumed_maxsize(consumed_pos, | |
991 | produced_pos, max_stream_size); | |
992 | ||
10a50311 JD |
993 | while (consumed_pos < produced_pos) { |
994 | ssize_t read_len; | |
995 | unsigned long len, padded_len; | |
996 | ||
9ce5646a MD |
997 | health_code_update(); |
998 | ||
10a50311 JD |
999 | DBG("UST consumer taking snapshot at pos %lu", consumed_pos); |
1000 | ||
1001 | ret = ustctl_get_subbuf(stream->ustream, &consumed_pos); | |
1002 | if (ret < 0) { | |
1003 | if (ret != -EAGAIN) { | |
1004 | PERROR("ustctl_get_subbuf snapshot"); | |
1005 | goto error_close_stream; | |
1006 | } | |
1007 | DBG("UST consumer get subbuf failed. Skipping it."); | |
1008 | consumed_pos += stream->max_sb_size; | |
1009 | continue; | |
1010 | } | |
1011 | ||
1012 | ret = ustctl_get_subbuf_size(stream->ustream, &len); | |
1013 | if (ret < 0) { | |
1014 | ERR("Snapshot ustctl_get_subbuf_size"); | |
1015 | goto error_put_subbuf; | |
1016 | } | |
1017 | ||
1018 | ret = ustctl_get_padded_subbuf_size(stream->ustream, &padded_len); | |
1019 | if (ret < 0) { | |
1020 | ERR("Snapshot ustctl_get_padded_subbuf_size"); | |
1021 | goto error_put_subbuf; | |
1022 | } | |
1023 | ||
1024 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
309167d2 | 1025 | padded_len - len, NULL); |
10a50311 JD |
1026 | if (use_relayd) { |
1027 | if (read_len != len) { | |
56591bac | 1028 | ret = -EPERM; |
10a50311 JD |
1029 | goto error_put_subbuf; |
1030 | } | |
1031 | } else { | |
1032 | if (read_len != padded_len) { | |
56591bac | 1033 | ret = -EPERM; |
10a50311 JD |
1034 | goto error_put_subbuf; |
1035 | } | |
1036 | } | |
1037 | ||
1038 | ret = ustctl_put_subbuf(stream->ustream); | |
1039 | if (ret < 0) { | |
1040 | ERR("Snapshot ustctl_put_subbuf"); | |
1041 | goto error_close_stream; | |
1042 | } | |
1043 | consumed_pos += stream->max_sb_size; | |
1044 | } | |
1045 | ||
1046 | /* Simply close the stream so we can use it on the next snapshot. */ | |
1047 | consumer_stream_close(stream); | |
1048 | pthread_mutex_unlock(&stream->lock); | |
1049 | } | |
1050 | ||
1051 | rcu_read_unlock(); | |
1052 | return 0; | |
1053 | ||
1054 | error_put_subbuf: | |
1055 | if (ustctl_put_subbuf(stream->ustream) < 0) { | |
1056 | ERR("Snapshot ustctl_put_subbuf"); | |
1057 | } | |
1058 | error_close_stream: | |
1059 | consumer_stream_close(stream); | |
1060 | error_unlock: | |
1061 | pthread_mutex_unlock(&stream->lock); | |
1062 | error: | |
1063 | rcu_read_unlock(); | |
d88aee68 DG |
1064 | return ret; |
1065 | } | |
1066 | ||
331744e3 JD |
1067 | /* |
1068 | * Receive the metadata updates from the sessiond. | |
1069 | */ | |
1070 | int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset, | |
5e41ebe1 | 1071 | uint64_t len, struct lttng_consumer_channel *channel, |
94d49140 | 1072 | int timer, int wait) |
331744e3 | 1073 | { |
0c759fc9 | 1074 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
331744e3 JD |
1075 | char *metadata_str; |
1076 | ||
8fd623e0 | 1077 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len); |
331744e3 JD |
1078 | |
1079 | metadata_str = zmalloc(len * sizeof(char)); | |
1080 | if (!metadata_str) { | |
1081 | PERROR("zmalloc metadata string"); | |
1082 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; | |
1083 | goto end; | |
1084 | } | |
1085 | ||
9ce5646a MD |
1086 | health_code_update(); |
1087 | ||
331744e3 JD |
1088 | /* Receive metadata string. */ |
1089 | ret = lttcomm_recv_unix_sock(sock, metadata_str, len); | |
1090 | if (ret < 0) { | |
1091 | /* Session daemon is dead so return gracefully. */ | |
1092 | ret_code = ret; | |
1093 | goto end_free; | |
1094 | } | |
1095 | ||
9ce5646a MD |
1096 | health_code_update(); |
1097 | ||
331744e3 JD |
1098 | pthread_mutex_lock(&channel->metadata_cache->lock); |
1099 | ret = consumer_metadata_cache_write(channel, offset, len, metadata_str); | |
1100 | if (ret < 0) { | |
1101 | /* Unable to handle metadata. Notify session daemon. */ | |
1102 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
a32bd775 DG |
1103 | /* |
1104 | * Skip metadata flush on write error since the offset and len might | |
1105 | * not have been updated which could create an infinite loop below when | |
1106 | * waiting for the metadata cache to be flushed. | |
1107 | */ | |
1108 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
a32bd775 | 1109 | goto end_free; |
331744e3 JD |
1110 | } |
1111 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
1112 | ||
94d49140 JD |
1113 | if (!wait) { |
1114 | goto end_free; | |
1115 | } | |
5e41ebe1 | 1116 | while (consumer_metadata_cache_flushed(channel, offset + len, timer)) { |
331744e3 | 1117 | DBG("Waiting for metadata to be flushed"); |
9ce5646a MD |
1118 | |
1119 | health_code_update(); | |
1120 | ||
331744e3 JD |
1121 | usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME); |
1122 | } | |
1123 | ||
1124 | end_free: | |
1125 | free(metadata_str); | |
1126 | end: | |
1127 | return ret_code; | |
1128 | } | |
1129 | ||
4cbc1a04 DG |
1130 | /* |
1131 | * Receive command from session daemon and process it. | |
1132 | * | |
1133 | * Return 1 on success else a negative value or 0. | |
1134 | */ | |
3bd1e081 MD |
1135 | int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
1136 | int sock, struct pollfd *consumer_sockpoll) | |
1137 | { | |
1138 | ssize_t ret; | |
0c759fc9 | 1139 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 | 1140 | struct lttcomm_consumer_msg msg; |
ffe60014 | 1141 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 | 1142 | |
9ce5646a MD |
1143 | health_code_update(); |
1144 | ||
3bd1e081 MD |
1145 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
1146 | if (ret != sizeof(msg)) { | |
173af62f DG |
1147 | DBG("Consumer received unexpected message size %zd (expects %zu)", |
1148 | ret, sizeof(msg)); | |
3be74084 DG |
1149 | /* |
1150 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
1151 | * since the caller handles this. | |
1152 | */ | |
489f70e9 | 1153 | if (ret > 0) { |
c6857fcf | 1154 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
489f70e9 MD |
1155 | ret = -1; |
1156 | } | |
3bd1e081 MD |
1157 | return ret; |
1158 | } | |
9ce5646a MD |
1159 | |
1160 | health_code_update(); | |
1161 | ||
3bd1e081 | 1162 | if (msg.cmd_type == LTTNG_CONSUMER_STOP) { |
f50f23d9 DG |
1163 | /* |
1164 | * Notify the session daemon that the command is completed. | |
1165 | * | |
1166 | * On transport layer error, the function call will print an error | |
1167 | * message so handling the returned code is a bit useless since we | |
1168 | * return an error code anyway. | |
1169 | */ | |
1170 | (void) consumer_send_status_msg(sock, ret_code); | |
3bd1e081 MD |
1171 | return -ENOENT; |
1172 | } | |
1173 | ||
9ce5646a MD |
1174 | health_code_update(); |
1175 | ||
3f8e211f | 1176 | /* relayd needs RCU read-side lock */ |
b0b335c8 MD |
1177 | rcu_read_lock(); |
1178 | ||
3bd1e081 | 1179 | switch (msg.cmd_type) { |
00e2e675 DG |
1180 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
1181 | { | |
f50f23d9 | 1182 | /* Session daemon status message are handled in the following call. */ |
7735ef9e DG |
1183 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
1184 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, | |
d3e2ba59 JD |
1185 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
1186 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
1187 | goto end_nosignal; |
1188 | } | |
173af62f DG |
1189 | case LTTNG_CONSUMER_DESTROY_RELAYD: |
1190 | { | |
a6ba4fe1 | 1191 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
173af62f DG |
1192 | struct consumer_relayd_sock_pair *relayd; |
1193 | ||
a6ba4fe1 | 1194 | DBG("UST consumer destroying relayd %" PRIu64, index); |
173af62f DG |
1195 | |
1196 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 1197 | relayd = consumer_find_relayd(index); |
173af62f | 1198 | if (relayd == NULL) { |
3448e266 | 1199 | DBG("Unable to find relayd %" PRIu64, index); |
f50f23d9 | 1200 | ret_code = LTTNG_ERR_NO_CONSUMER; |
173af62f DG |
1201 | } |
1202 | ||
a6ba4fe1 DG |
1203 | /* |
1204 | * Each relayd socket pair has a refcount of stream attached to it | |
1205 | * which tells if the relayd is still active or not depending on the | |
1206 | * refcount value. | |
1207 | * | |
1208 | * This will set the destroy flag of the relayd object and destroy it | |
1209 | * if the refcount reaches zero when called. | |
1210 | * | |
1211 | * The destroy can happen either here or when a stream fd hangs up. | |
1212 | */ | |
f50f23d9 DG |
1213 | if (relayd) { |
1214 | consumer_flag_relayd_for_destroy(relayd); | |
1215 | } | |
1216 | ||
d88aee68 | 1217 | goto end_msg_sessiond; |
173af62f | 1218 | } |
3bd1e081 MD |
1219 | case LTTNG_CONSUMER_UPDATE_STREAM: |
1220 | { | |
3f8e211f | 1221 | rcu_read_unlock(); |
7ad0a0cb | 1222 | return -ENOSYS; |
3bd1e081 | 1223 | } |
6d805429 | 1224 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 1225 | { |
3be74084 | 1226 | int ret, is_data_pending; |
6d805429 | 1227 | uint64_t id = msg.u.data_pending.session_id; |
ca22feea | 1228 | |
6d805429 | 1229 | DBG("UST consumer data pending command for id %" PRIu64, id); |
ca22feea | 1230 | |
3be74084 | 1231 | is_data_pending = consumer_data_pending(id); |
ca22feea DG |
1232 | |
1233 | /* Send back returned value to session daemon */ | |
3be74084 DG |
1234 | ret = lttcomm_send_unix_sock(sock, &is_data_pending, |
1235 | sizeof(is_data_pending)); | |
ca22feea | 1236 | if (ret < 0) { |
3be74084 | 1237 | DBG("Error when sending the data pending ret code: %d", ret); |
489f70e9 | 1238 | goto error_fatal; |
ca22feea | 1239 | } |
f50f23d9 DG |
1240 | |
1241 | /* | |
1242 | * No need to send back a status message since the data pending | |
1243 | * returned value is the response. | |
1244 | */ | |
ca22feea | 1245 | break; |
53632229 | 1246 | } |
ffe60014 DG |
1247 | case LTTNG_CONSUMER_ASK_CHANNEL_CREATION: |
1248 | { | |
1249 | int ret; | |
1250 | struct ustctl_consumer_channel_attr attr; | |
1251 | ||
1252 | /* Create a plain object and reserve a channel key. */ | |
1253 | channel = allocate_channel(msg.u.ask_channel.session_id, | |
1254 | msg.u.ask_channel.pathname, msg.u.ask_channel.name, | |
1255 | msg.u.ask_channel.uid, msg.u.ask_channel.gid, | |
1256 | msg.u.ask_channel.relayd_id, msg.u.ask_channel.key, | |
1624d5b7 JD |
1257 | (enum lttng_event_output) msg.u.ask_channel.output, |
1258 | msg.u.ask_channel.tracefile_size, | |
2bba9e53 | 1259 | msg.u.ask_channel.tracefile_count, |
1950109e | 1260 | msg.u.ask_channel.session_id_per_pid, |
ecc48a90 JD |
1261 | msg.u.ask_channel.monitor, |
1262 | msg.u.ask_channel.live_timer_interval); | |
ffe60014 DG |
1263 | if (!channel) { |
1264 | goto end_channel_error; | |
1265 | } | |
1266 | ||
567eb353 DG |
1267 | /* |
1268 | * Assign UST application UID to the channel. This value is ignored for | |
1269 | * per PID buffers. This is specific to UST thus setting this after the | |
1270 | * allocation. | |
1271 | */ | |
1272 | channel->ust_app_uid = msg.u.ask_channel.ust_app_uid; | |
1273 | ||
ffe60014 DG |
1274 | /* Build channel attributes from received message. */ |
1275 | attr.subbuf_size = msg.u.ask_channel.subbuf_size; | |
1276 | attr.num_subbuf = msg.u.ask_channel.num_subbuf; | |
1277 | attr.overwrite = msg.u.ask_channel.overwrite; | |
1278 | attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval; | |
1279 | attr.read_timer_interval = msg.u.ask_channel.read_timer_interval; | |
7972aab2 | 1280 | attr.chan_id = msg.u.ask_channel.chan_id; |
ffe60014 DG |
1281 | memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid)); |
1282 | ||
0c759fc9 DG |
1283 | /* Match channel buffer type to the UST abi. */ |
1284 | switch (msg.u.ask_channel.output) { | |
1285 | case LTTNG_EVENT_MMAP: | |
1286 | default: | |
1287 | attr.output = LTTNG_UST_MMAP; | |
1288 | break; | |
1289 | } | |
1290 | ||
ffe60014 DG |
1291 | /* Translate and save channel type. */ |
1292 | switch (msg.u.ask_channel.type) { | |
1293 | case LTTNG_UST_CHAN_PER_CPU: | |
1294 | channel->type = CONSUMER_CHANNEL_TYPE_DATA; | |
1295 | attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8633d6e3 MD |
1296 | /* |
1297 | * Set refcount to 1 for owner. Below, we will | |
1298 | * pass ownership to the | |
1299 | * consumer_thread_channel_poll() thread. | |
1300 | */ | |
1301 | channel->refcount = 1; | |
ffe60014 DG |
1302 | break; |
1303 | case LTTNG_UST_CHAN_METADATA: | |
1304 | channel->type = CONSUMER_CHANNEL_TYPE_METADATA; | |
1305 | attr.type = LTTNG_UST_CHAN_METADATA; | |
1306 | break; | |
1307 | default: | |
1308 | assert(0); | |
1309 | goto error_fatal; | |
1310 | }; | |
1311 | ||
9ce5646a MD |
1312 | health_code_update(); |
1313 | ||
ffe60014 DG |
1314 | ret = ask_channel(ctx, sock, channel, &attr); |
1315 | if (ret < 0) { | |
1316 | goto end_channel_error; | |
1317 | } | |
1318 | ||
fc643247 MD |
1319 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1320 | ret = consumer_metadata_cache_allocate(channel); | |
1321 | if (ret < 0) { | |
1322 | ERR("Allocating metadata cache"); | |
1323 | goto end_channel_error; | |
1324 | } | |
1325 | consumer_timer_switch_start(channel, attr.switch_timer_interval); | |
1326 | attr.switch_timer_interval = 0; | |
94d49140 JD |
1327 | } else { |
1328 | consumer_timer_live_start(channel, | |
1329 | msg.u.ask_channel.live_timer_interval); | |
fc643247 MD |
1330 | } |
1331 | ||
9ce5646a MD |
1332 | health_code_update(); |
1333 | ||
ffe60014 DG |
1334 | /* |
1335 | * Add the channel to the internal state AFTER all streams were created | |
1336 | * and successfully sent to session daemon. This way, all streams must | |
1337 | * be ready before this channel is visible to the threads. | |
fc643247 MD |
1338 | * If add_channel succeeds, ownership of the channel is |
1339 | * passed to consumer_thread_channel_poll(). | |
ffe60014 DG |
1340 | */ |
1341 | ret = add_channel(channel, ctx); | |
1342 | if (ret < 0) { | |
ea88ca2a MD |
1343 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1344 | if (channel->switch_timer_enabled == 1) { | |
1345 | consumer_timer_switch_stop(channel); | |
1346 | } | |
1347 | consumer_metadata_cache_destroy(channel); | |
1348 | } | |
d3e2ba59 JD |
1349 | if (channel->live_timer_enabled == 1) { |
1350 | consumer_timer_live_stop(channel); | |
1351 | } | |
ffe60014 DG |
1352 | goto end_channel_error; |
1353 | } | |
1354 | ||
9ce5646a MD |
1355 | health_code_update(); |
1356 | ||
ffe60014 DG |
1357 | /* |
1358 | * Channel and streams are now created. Inform the session daemon that | |
1359 | * everything went well and should wait to receive the channel and | |
1360 | * streams with ustctl API. | |
1361 | */ | |
1362 | ret = consumer_send_status_channel(sock, channel); | |
1363 | if (ret < 0) { | |
1364 | /* | |
489f70e9 | 1365 | * There is probably a problem on the socket. |
ffe60014 | 1366 | */ |
489f70e9 | 1367 | goto error_fatal; |
ffe60014 DG |
1368 | } |
1369 | ||
1370 | break; | |
1371 | } | |
1372 | case LTTNG_CONSUMER_GET_CHANNEL: | |
1373 | { | |
1374 | int ret, relayd_err = 0; | |
d88aee68 | 1375 | uint64_t key = msg.u.get_channel.key; |
ffe60014 | 1376 | struct lttng_consumer_channel *channel; |
ffe60014 DG |
1377 | |
1378 | channel = consumer_find_channel(key); | |
1379 | if (!channel) { | |
8fd623e0 | 1380 | ERR("UST consumer get channel key %" PRIu64 " not found", key); |
ffe60014 DG |
1381 | ret_code = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
1382 | goto end_msg_sessiond; | |
1383 | } | |
1384 | ||
9ce5646a MD |
1385 | health_code_update(); |
1386 | ||
ffe60014 DG |
1387 | /* Send everything to sessiond. */ |
1388 | ret = send_sessiond_channel(sock, channel, ctx, &relayd_err); | |
1389 | if (ret < 0) { | |
1390 | if (relayd_err) { | |
1391 | /* | |
1392 | * We were unable to send to the relayd the stream so avoid | |
1393 | * sending back a fatal error to the thread since this is OK | |
f2a444f1 DG |
1394 | * and the consumer can continue its work. The above call |
1395 | * has sent the error status message to the sessiond. | |
ffe60014 | 1396 | */ |
f2a444f1 | 1397 | goto end_nosignal; |
ffe60014 DG |
1398 | } |
1399 | /* | |
1400 | * The communicaton was broken hence there is a bad state between | |
1401 | * the consumer and sessiond so stop everything. | |
1402 | */ | |
1403 | goto error_fatal; | |
1404 | } | |
1405 | ||
9ce5646a MD |
1406 | health_code_update(); |
1407 | ||
10a50311 JD |
1408 | /* |
1409 | * In no monitor mode, the streams ownership is kept inside the channel | |
1410 | * so don't send them to the data thread. | |
1411 | */ | |
1412 | if (!channel->monitor) { | |
1413 | goto end_msg_sessiond; | |
1414 | } | |
1415 | ||
d88aee68 DG |
1416 | ret = send_streams_to_thread(channel, ctx); |
1417 | if (ret < 0) { | |
1418 | /* | |
1419 | * If we are unable to send the stream to the thread, there is | |
1420 | * a big problem so just stop everything. | |
1421 | */ | |
1422 | goto error_fatal; | |
ffe60014 | 1423 | } |
ffe60014 DG |
1424 | /* List MUST be empty after or else it could be reused. */ |
1425 | assert(cds_list_empty(&channel->streams.head)); | |
d88aee68 DG |
1426 | goto end_msg_sessiond; |
1427 | } | |
1428 | case LTTNG_CONSUMER_DESTROY_CHANNEL: | |
1429 | { | |
1430 | uint64_t key = msg.u.destroy_channel.key; | |
d88aee68 | 1431 | |
a0cbdd2e MD |
1432 | /* |
1433 | * Only called if streams have not been sent to stream | |
1434 | * manager thread. However, channel has been sent to | |
1435 | * channel manager thread. | |
1436 | */ | |
1437 | notify_thread_del_channel(ctx, key); | |
d88aee68 | 1438 | goto end_msg_sessiond; |
ffe60014 | 1439 | } |
d88aee68 DG |
1440 | case LTTNG_CONSUMER_CLOSE_METADATA: |
1441 | { | |
1442 | int ret; | |
1443 | ||
1444 | ret = close_metadata(msg.u.close_metadata.key); | |
1445 | if (ret != 0) { | |
1446 | ret_code = ret; | |
1447 | } | |
1448 | ||
1449 | goto end_msg_sessiond; | |
1450 | } | |
7972aab2 DG |
1451 | case LTTNG_CONSUMER_FLUSH_CHANNEL: |
1452 | { | |
1453 | int ret; | |
1454 | ||
1455 | ret = flush_channel(msg.u.flush_channel.key); | |
1456 | if (ret != 0) { | |
1457 | ret_code = ret; | |
1458 | } | |
1459 | ||
1460 | goto end_msg_sessiond; | |
1461 | } | |
d88aee68 | 1462 | case LTTNG_CONSUMER_PUSH_METADATA: |
ffe60014 DG |
1463 | { |
1464 | int ret; | |
d88aee68 | 1465 | uint64_t len = msg.u.push_metadata.len; |
d88aee68 | 1466 | uint64_t key = msg.u.push_metadata.key; |
331744e3 | 1467 | uint64_t offset = msg.u.push_metadata.target_offset; |
ffe60014 DG |
1468 | struct lttng_consumer_channel *channel; |
1469 | ||
8fd623e0 DG |
1470 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, |
1471 | len); | |
ffe60014 DG |
1472 | |
1473 | channel = consumer_find_channel(key); | |
1474 | if (!channel) { | |
000baf6a DG |
1475 | /* |
1476 | * This is possible if the metadata creation on the consumer side | |
1477 | * is in flight vis-a-vis a concurrent push metadata from the | |
1478 | * session daemon. Simply return that the channel failed and the | |
1479 | * session daemon will handle that message correctly considering | |
1480 | * that this race is acceptable thus the DBG() statement here. | |
1481 | */ | |
1482 | DBG("UST consumer push metadata %" PRIu64 " not found", key); | |
1483 | ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; | |
4a2eb0ca | 1484 | goto end_msg_sessiond; |
d88aee68 DG |
1485 | } |
1486 | ||
9ce5646a MD |
1487 | health_code_update(); |
1488 | ||
d88aee68 | 1489 | /* Tell session daemon we are ready to receive the metadata. */ |
0c759fc9 | 1490 | ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS); |
ffe60014 DG |
1491 | if (ret < 0) { |
1492 | /* Somehow, the session daemon is not responding anymore. */ | |
d88aee68 DG |
1493 | goto error_fatal; |
1494 | } | |
1495 | ||
9ce5646a MD |
1496 | health_code_update(); |
1497 | ||
d88aee68 | 1498 | /* Wait for more data. */ |
9ce5646a MD |
1499 | health_poll_entry(); |
1500 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
1501 | health_poll_exit(); | |
1502 | if (ret < 0) { | |
489f70e9 | 1503 | goto error_fatal; |
d88aee68 DG |
1504 | } |
1505 | ||
9ce5646a MD |
1506 | health_code_update(); |
1507 | ||
331744e3 | 1508 | ret = lttng_ustconsumer_recv_metadata(sock, key, offset, |
94d49140 | 1509 | len, channel, 0, 1); |
d88aee68 | 1510 | if (ret < 0) { |
331744e3 | 1511 | /* error receiving from sessiond */ |
489f70e9 | 1512 | goto error_fatal; |
331744e3 JD |
1513 | } else { |
1514 | ret_code = ret; | |
d88aee68 DG |
1515 | goto end_msg_sessiond; |
1516 | } | |
d88aee68 DG |
1517 | } |
1518 | case LTTNG_CONSUMER_SETUP_METADATA: | |
1519 | { | |
1520 | int ret; | |
1521 | ||
1522 | ret = setup_metadata(ctx, msg.u.setup_metadata.key); | |
1523 | if (ret) { | |
1524 | ret_code = ret; | |
1525 | } | |
1526 | goto end_msg_sessiond; | |
ffe60014 | 1527 | } |
6dc3064a DG |
1528 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
1529 | { | |
10a50311 JD |
1530 | if (msg.u.snapshot_channel.metadata) { |
1531 | ret = snapshot_metadata(msg.u.snapshot_channel.key, | |
1532 | msg.u.snapshot_channel.pathname, | |
1533 | msg.u.snapshot_channel.relayd_id, | |
1534 | ctx); | |
1535 | if (ret < 0) { | |
1536 | ERR("Snapshot metadata failed"); | |
1537 | ret_code = LTTNG_ERR_UST_META_FAIL; | |
1538 | } | |
1539 | } else { | |
1540 | ret = snapshot_channel(msg.u.snapshot_channel.key, | |
1541 | msg.u.snapshot_channel.pathname, | |
1542 | msg.u.snapshot_channel.relayd_id, | |
5c786ded | 1543 | msg.u.snapshot_channel.max_stream_size, |
10a50311 JD |
1544 | ctx); |
1545 | if (ret < 0) { | |
1546 | ERR("Snapshot channel failed"); | |
1547 | ret_code = LTTNG_ERR_UST_CHAN_FAIL; | |
1548 | } | |
1549 | } | |
1550 | ||
9ce5646a | 1551 | health_code_update(); |
6dc3064a DG |
1552 | ret = consumer_send_status_msg(sock, ret_code); |
1553 | if (ret < 0) { | |
1554 | /* Somehow, the session daemon is not responding anymore. */ | |
1555 | goto end_nosignal; | |
1556 | } | |
9ce5646a | 1557 | health_code_update(); |
6dc3064a DG |
1558 | break; |
1559 | } | |
3bd1e081 MD |
1560 | default: |
1561 | break; | |
1562 | } | |
3f8e211f | 1563 | |
3bd1e081 | 1564 | end_nosignal: |
b0b335c8 | 1565 | rcu_read_unlock(); |
4cbc1a04 | 1566 | |
9ce5646a MD |
1567 | health_code_update(); |
1568 | ||
4cbc1a04 DG |
1569 | /* |
1570 | * Return 1 to indicate success since the 0 value can be a socket | |
1571 | * shutdown during the recv() or send() call. | |
1572 | */ | |
1573 | return 1; | |
ffe60014 DG |
1574 | |
1575 | end_msg_sessiond: | |
1576 | /* | |
1577 | * The returned value here is not useful since either way we'll return 1 to | |
1578 | * the caller because the session daemon socket management is done | |
1579 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. | |
1580 | */ | |
489f70e9 MD |
1581 | ret = consumer_send_status_msg(sock, ret_code); |
1582 | if (ret < 0) { | |
1583 | goto error_fatal; | |
1584 | } | |
ffe60014 | 1585 | rcu_read_unlock(); |
9ce5646a MD |
1586 | |
1587 | health_code_update(); | |
1588 | ||
ffe60014 DG |
1589 | return 1; |
1590 | end_channel_error: | |
1591 | if (channel) { | |
1592 | /* | |
1593 | * Free channel here since no one has a reference to it. We don't | |
1594 | * free after that because a stream can store this pointer. | |
1595 | */ | |
1596 | destroy_channel(channel); | |
1597 | } | |
1598 | /* We have to send a status channel message indicating an error. */ | |
1599 | ret = consumer_send_status_channel(sock, NULL); | |
1600 | if (ret < 0) { | |
1601 | /* Stop everything if session daemon can not be notified. */ | |
1602 | goto error_fatal; | |
1603 | } | |
1604 | rcu_read_unlock(); | |
9ce5646a MD |
1605 | |
1606 | health_code_update(); | |
1607 | ||
ffe60014 DG |
1608 | return 1; |
1609 | error_fatal: | |
1610 | rcu_read_unlock(); | |
1611 | /* This will issue a consumer stop. */ | |
1612 | return -1; | |
3bd1e081 MD |
1613 | } |
1614 | ||
ffe60014 DG |
1615 | /* |
1616 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
1617 | * compiled out, we isolate it in this library. | |
1618 | */ | |
1619 | int lttng_ustctl_get_mmap_read_offset(struct lttng_consumer_stream *stream, | |
1620 | unsigned long *off) | |
3bd1e081 | 1621 | { |
ffe60014 DG |
1622 | assert(stream); |
1623 | assert(stream->ustream); | |
b5c5fc29 | 1624 | |
ffe60014 | 1625 | return ustctl_get_mmap_read_offset(stream->ustream, off); |
3bd1e081 MD |
1626 | } |
1627 | ||
ffe60014 DG |
1628 | /* |
1629 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
1630 | * compiled out, we isolate it in this library. | |
1631 | */ | |
1632 | void *lttng_ustctl_get_mmap_base(struct lttng_consumer_stream *stream) | |
d056b477 | 1633 | { |
ffe60014 DG |
1634 | assert(stream); |
1635 | assert(stream->ustream); | |
1636 | ||
1637 | return ustctl_get_mmap_base(stream->ustream); | |
d056b477 MD |
1638 | } |
1639 | ||
ffe60014 DG |
1640 | /* |
1641 | * Take a snapshot for a specific fd | |
1642 | * | |
1643 | * Returns 0 on success, < 0 on error | |
1644 | */ | |
1645 | int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream) | |
3bd1e081 | 1646 | { |
ffe60014 DG |
1647 | assert(stream); |
1648 | assert(stream->ustream); | |
1649 | ||
1650 | return ustctl_snapshot(stream->ustream); | |
3bd1e081 MD |
1651 | } |
1652 | ||
ffe60014 DG |
1653 | /* |
1654 | * Get the produced position | |
1655 | * | |
1656 | * Returns 0 on success, < 0 on error | |
1657 | */ | |
1658 | int lttng_ustconsumer_get_produced_snapshot( | |
1659 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
3bd1e081 | 1660 | { |
ffe60014 DG |
1661 | assert(stream); |
1662 | assert(stream->ustream); | |
1663 | assert(pos); | |
7a57cf92 | 1664 | |
ffe60014 DG |
1665 | return ustctl_snapshot_get_produced(stream->ustream, pos); |
1666 | } | |
7a57cf92 | 1667 | |
10a50311 JD |
1668 | /* |
1669 | * Get the consumed position | |
1670 | * | |
1671 | * Returns 0 on success, < 0 on error | |
1672 | */ | |
1673 | int lttng_ustconsumer_get_consumed_snapshot( | |
1674 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
1675 | { | |
1676 | assert(stream); | |
1677 | assert(stream->ustream); | |
1678 | assert(pos); | |
1679 | ||
1680 | return ustctl_snapshot_get_consumed(stream->ustream, pos); | |
1681 | } | |
1682 | ||
84a182ce DG |
1683 | void lttng_ustconsumer_flush_buffer(struct lttng_consumer_stream *stream, |
1684 | int producer) | |
1685 | { | |
1686 | assert(stream); | |
1687 | assert(stream->ustream); | |
1688 | ||
1689 | ustctl_flush_buffer(stream->ustream, producer); | |
1690 | } | |
1691 | ||
1692 | int lttng_ustconsumer_get_current_timestamp( | |
1693 | struct lttng_consumer_stream *stream, uint64_t *ts) | |
1694 | { | |
1695 | assert(stream); | |
1696 | assert(stream->ustream); | |
1697 | assert(ts); | |
1698 | ||
1699 | return ustctl_get_current_timestamp(stream->ustream, ts); | |
1700 | } | |
1701 | ||
ffe60014 DG |
1702 | /* |
1703 | * Called when the stream signal the consumer that it has hang up. | |
1704 | */ | |
1705 | void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream) | |
1706 | { | |
1707 | assert(stream); | |
1708 | assert(stream->ustream); | |
2c1dd183 | 1709 | |
ffe60014 DG |
1710 | ustctl_flush_buffer(stream->ustream, 0); |
1711 | stream->hangup_flush_done = 1; | |
1712 | } | |
ee77a7b0 | 1713 | |
ffe60014 DG |
1714 | void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan) |
1715 | { | |
1716 | assert(chan); | |
1717 | assert(chan->uchan); | |
e316aad5 | 1718 | |
ea88ca2a MD |
1719 | if (chan->switch_timer_enabled == 1) { |
1720 | consumer_timer_switch_stop(chan); | |
1721 | } | |
1722 | consumer_metadata_cache_destroy(chan); | |
ffe60014 | 1723 | ustctl_destroy_channel(chan->uchan); |
3bd1e081 MD |
1724 | } |
1725 | ||
1726 | void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream) | |
1727 | { | |
ffe60014 DG |
1728 | assert(stream); |
1729 | assert(stream->ustream); | |
d41f73b7 | 1730 | |
ea88ca2a MD |
1731 | if (stream->chan->switch_timer_enabled == 1) { |
1732 | consumer_timer_switch_stop(stream->chan); | |
1733 | } | |
ffe60014 DG |
1734 | ustctl_destroy_stream(stream->ustream); |
1735 | } | |
d41f73b7 | 1736 | |
309167d2 JD |
1737 | /* |
1738 | * Populate index values of a UST stream. Values are set in big endian order. | |
1739 | * | |
1740 | * Return 0 on success or else a negative value. | |
1741 | */ | |
50adc264 | 1742 | static int get_index_values(struct ctf_packet_index *index, |
309167d2 JD |
1743 | struct ustctl_consumer_stream *ustream) |
1744 | { | |
1745 | int ret; | |
1746 | ||
1747 | ret = ustctl_get_timestamp_begin(ustream, &index->timestamp_begin); | |
1748 | if (ret < 0) { | |
1749 | PERROR("ustctl_get_timestamp_begin"); | |
1750 | goto error; | |
1751 | } | |
1752 | index->timestamp_begin = htobe64(index->timestamp_begin); | |
1753 | ||
1754 | ret = ustctl_get_timestamp_end(ustream, &index->timestamp_end); | |
1755 | if (ret < 0) { | |
1756 | PERROR("ustctl_get_timestamp_end"); | |
1757 | goto error; | |
1758 | } | |
1759 | index->timestamp_end = htobe64(index->timestamp_end); | |
1760 | ||
1761 | ret = ustctl_get_events_discarded(ustream, &index->events_discarded); | |
1762 | if (ret < 0) { | |
1763 | PERROR("ustctl_get_events_discarded"); | |
1764 | goto error; | |
1765 | } | |
1766 | index->events_discarded = htobe64(index->events_discarded); | |
1767 | ||
1768 | ret = ustctl_get_content_size(ustream, &index->content_size); | |
1769 | if (ret < 0) { | |
1770 | PERROR("ustctl_get_content_size"); | |
1771 | goto error; | |
1772 | } | |
1773 | index->content_size = htobe64(index->content_size); | |
1774 | ||
1775 | ret = ustctl_get_packet_size(ustream, &index->packet_size); | |
1776 | if (ret < 0) { | |
1777 | PERROR("ustctl_get_packet_size"); | |
1778 | goto error; | |
1779 | } | |
1780 | index->packet_size = htobe64(index->packet_size); | |
1781 | ||
1782 | ret = ustctl_get_stream_id(ustream, &index->stream_id); | |
1783 | if (ret < 0) { | |
1784 | PERROR("ustctl_get_stream_id"); | |
1785 | goto error; | |
1786 | } | |
1787 | index->stream_id = htobe64(index->stream_id); | |
1788 | ||
1789 | error: | |
1790 | return ret; | |
1791 | } | |
1792 | ||
94d49140 JD |
1793 | /* |
1794 | * Write up to one packet from the metadata cache to the channel. | |
1795 | * | |
1796 | * Returns the number of bytes pushed in the cache, or a negative value | |
1797 | * on error. | |
1798 | */ | |
1799 | static | |
1800 | int commit_one_metadata_packet(struct lttng_consumer_stream *stream) | |
1801 | { | |
1802 | ssize_t write_len; | |
1803 | int ret; | |
1804 | ||
1805 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); | |
1806 | if (stream->chan->metadata_cache->contiguous | |
1807 | == stream->ust_metadata_pushed) { | |
1808 | ret = 0; | |
1809 | goto end; | |
1810 | } | |
1811 | ||
1812 | write_len = ustctl_write_one_packet_to_channel(stream->chan->uchan, | |
1813 | &stream->chan->metadata_cache->data[stream->ust_metadata_pushed], | |
1814 | stream->chan->metadata_cache->contiguous | |
1815 | - stream->ust_metadata_pushed); | |
1816 | assert(write_len != 0); | |
1817 | if (write_len < 0) { | |
1818 | ERR("Writing one metadata packet"); | |
1819 | ret = -1; | |
1820 | goto end; | |
1821 | } | |
1822 | stream->ust_metadata_pushed += write_len; | |
1823 | ||
1824 | assert(stream->chan->metadata_cache->contiguous >= | |
1825 | stream->ust_metadata_pushed); | |
1826 | ret = write_len; | |
1827 | ||
1828 | end: | |
1829 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); | |
1830 | return ret; | |
1831 | } | |
1832 | ||
309167d2 | 1833 | |
94d49140 JD |
1834 | /* |
1835 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
1836 | * metadata thread can consumer them. | |
1837 | * | |
1838 | * Metadata stream lock MUST be acquired. | |
1839 | * | |
1840 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream | |
1841 | * is empty or a negative value on error. | |
1842 | */ | |
1843 | int lttng_ustconsumer_sync_metadata(struct lttng_consumer_local_data *ctx, | |
1844 | struct lttng_consumer_stream *metadata) | |
1845 | { | |
1846 | int ret; | |
1847 | int retry = 0; | |
1848 | ||
1849 | assert(ctx); | |
1850 | assert(metadata); | |
1851 | ||
1852 | /* | |
1853 | * Request metadata from the sessiond, but don't wait for the flush | |
1854 | * because we locked the metadata thread. | |
1855 | */ | |
1856 | ret = lttng_ustconsumer_request_metadata(ctx, metadata->chan, 0, 0); | |
1857 | if (ret < 0) { | |
1858 | goto end; | |
1859 | } | |
1860 | ||
1861 | ret = commit_one_metadata_packet(metadata); | |
1862 | if (ret <= 0) { | |
1863 | goto end; | |
1864 | } else if (ret > 0) { | |
1865 | retry = 1; | |
1866 | } | |
1867 | ||
1868 | ustctl_flush_buffer(metadata->ustream, 1); | |
1869 | ret = ustctl_snapshot(metadata->ustream); | |
1870 | if (ret < 0) { | |
1871 | if (errno != EAGAIN) { | |
1872 | ERR("Sync metadata, taking UST snapshot"); | |
1873 | goto end; | |
1874 | } | |
1875 | DBG("No new metadata when syncing them."); | |
1876 | /* No new metadata, exit. */ | |
1877 | ret = ENODATA; | |
1878 | goto end; | |
1879 | } | |
1880 | ||
1881 | /* | |
1882 | * After this flush, we still need to extract metadata. | |
1883 | */ | |
1884 | if (retry) { | |
1885 | ret = EAGAIN; | |
1886 | } | |
1887 | ||
1888 | end: | |
1889 | return ret; | |
1890 | } | |
1891 | ||
1892 | /* | |
1893 | * Read subbuffer from the given stream. | |
1894 | * | |
1895 | * Stream lock MUST be acquired. | |
1896 | * | |
1897 | * Return 0 on success else a negative value. | |
1898 | */ | |
d41f73b7 MD |
1899 | int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
1900 | struct lttng_consumer_local_data *ctx) | |
1901 | { | |
1d4dfdef | 1902 | unsigned long len, subbuf_size, padding; |
1c20f0e2 | 1903 | int err, write_index = 1; |
d41f73b7 | 1904 | long ret = 0; |
d41f73b7 | 1905 | char dummy; |
ffe60014 | 1906 | struct ustctl_consumer_stream *ustream; |
50adc264 | 1907 | struct ctf_packet_index index; |
ffe60014 DG |
1908 | |
1909 | assert(stream); | |
1910 | assert(stream->ustream); | |
1911 | assert(ctx); | |
d41f73b7 | 1912 | |
3eb914c0 | 1913 | DBG("In UST read_subbuffer (wait_fd: %d, name: %s)", stream->wait_fd, |
ffe60014 DG |
1914 | stream->name); |
1915 | ||
1916 | /* Ease our life for what's next. */ | |
1917 | ustream = stream->ustream; | |
d41f73b7 | 1918 | |
6cd525e8 MD |
1919 | /* |
1920 | * We can consume the 1 byte written into the wait_fd by UST. | |
1921 | * Don't trigger error if we cannot read this one byte (read | |
1922 | * returns 0), or if the error is EAGAIN or EWOULDBLOCK. | |
1923 | */ | |
04ef1097 | 1924 | if (stream->monitor && !stream->hangup_flush_done) { |
c617c0c6 MD |
1925 | ssize_t readlen; |
1926 | ||
6cd525e8 MD |
1927 | readlen = lttng_read(stream->wait_fd, &dummy, 1); |
1928 | if (readlen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
effcf122 MD |
1929 | ret = readlen; |
1930 | goto end; | |
1931 | } | |
d41f73b7 MD |
1932 | } |
1933 | ||
04ef1097 | 1934 | retry: |
d41f73b7 | 1935 | /* Get the next subbuffer */ |
ffe60014 | 1936 | err = ustctl_get_next_subbuf(ustream); |
d41f73b7 | 1937 | if (err != 0) { |
04ef1097 MD |
1938 | /* |
1939 | * Populate metadata info if the existing info has | |
1940 | * already been read. | |
1941 | */ | |
1942 | if (stream->metadata_flag) { | |
94d49140 JD |
1943 | ret = commit_one_metadata_packet(stream); |
1944 | if (ret <= 0) { | |
04ef1097 MD |
1945 | goto end; |
1946 | } | |
04ef1097 MD |
1947 | ustctl_flush_buffer(stream->ustream, 1); |
1948 | goto retry; | |
1949 | } | |
1950 | ||
1d4dfdef | 1951 | ret = err; /* ustctl_get_next_subbuf returns negative, caller expect positive. */ |
d41f73b7 MD |
1952 | /* |
1953 | * This is a debug message even for single-threaded consumer, | |
1954 | * because poll() have more relaxed criterions than get subbuf, | |
1955 | * so get_subbuf may fail for short race windows where poll() | |
1956 | * would issue wakeups. | |
1957 | */ | |
1958 | DBG("Reserving sub buffer failed (everything is normal, " | |
ffe60014 | 1959 | "it is due to concurrency) [ret: %d]", err); |
d41f73b7 MD |
1960 | goto end; |
1961 | } | |
ffe60014 | 1962 | assert(stream->chan->output == CONSUMER_CHANNEL_MMAP); |
309167d2 | 1963 | |
1c20f0e2 | 1964 | if (!stream->metadata_flag) { |
309167d2 JD |
1965 | index.offset = htobe64(stream->out_fd_offset); |
1966 | ret = get_index_values(&index, ustream); | |
1967 | if (ret < 0) { | |
1968 | goto end; | |
1969 | } | |
1c20f0e2 JD |
1970 | } else { |
1971 | write_index = 0; | |
309167d2 JD |
1972 | } |
1973 | ||
1d4dfdef | 1974 | /* Get the full padded subbuffer size */ |
ffe60014 | 1975 | err = ustctl_get_padded_subbuf_size(ustream, &len); |
effcf122 | 1976 | assert(err == 0); |
1d4dfdef DG |
1977 | |
1978 | /* Get subbuffer data size (without padding) */ | |
ffe60014 | 1979 | err = ustctl_get_subbuf_size(ustream, &subbuf_size); |
1d4dfdef DG |
1980 | assert(err == 0); |
1981 | ||
1982 | /* Make sure we don't get a subbuffer size bigger than the padded */ | |
1983 | assert(len >= subbuf_size); | |
1984 | ||
1985 | padding = len - subbuf_size; | |
d41f73b7 | 1986 | /* write the subbuffer to the tracefile */ |
309167d2 | 1987 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, padding, &index); |
91dfef6e DG |
1988 | /* |
1989 | * The mmap operation should write subbuf_size amount of data when network | |
1990 | * streaming or the full padding (len) size when we are _not_ streaming. | |
1991 | */ | |
d88aee68 DG |
1992 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
1993 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
d41f73b7 | 1994 | /* |
91dfef6e | 1995 | * Display the error but continue processing to try to release the |
c5c45efa DG |
1996 | * subbuffer. This is a DBG statement since any unexpected kill or |
1997 | * signal, the application gets unregistered, relayd gets closed or | |
1998 | * anything that affects the buffer lifetime will trigger this error. | |
1999 | * So, for the sake of the user, don't print this error since it can | |
2000 | * happen and it is OK with the code flow. | |
d41f73b7 | 2001 | */ |
c5c45efa | 2002 | DBG("Error writing to tracefile " |
8fd623e0 | 2003 | "(ret: %ld != len: %lu != subbuf_size: %lu)", |
91dfef6e | 2004 | ret, len, subbuf_size); |
309167d2 | 2005 | write_index = 0; |
d41f73b7 | 2006 | } |
ffe60014 | 2007 | err = ustctl_put_next_subbuf(ustream); |
effcf122 | 2008 | assert(err == 0); |
331744e3 | 2009 | |
309167d2 | 2010 | /* Write index if needed. */ |
1c20f0e2 JD |
2011 | if (!write_index) { |
2012 | goto end; | |
2013 | } | |
2014 | ||
94d49140 JD |
2015 | if (stream->chan->live_timer_interval && !stream->metadata_flag) { |
2016 | /* | |
2017 | * In live, block until all the metadata is sent. | |
2018 | */ | |
2019 | err = consumer_stream_sync_metadata(ctx, stream->session_id); | |
2020 | if (err < 0) { | |
2021 | goto end; | |
2022 | } | |
2023 | } | |
2024 | ||
1c20f0e2 JD |
2025 | assert(!stream->metadata_flag); |
2026 | err = consumer_stream_write_index(stream, &index); | |
2027 | if (err < 0) { | |
2028 | goto end; | |
309167d2 JD |
2029 | } |
2030 | ||
d41f73b7 MD |
2031 | end: |
2032 | return ret; | |
2033 | } | |
2034 | ||
ffe60014 DG |
2035 | /* |
2036 | * Called when a stream is created. | |
fe4477ee JD |
2037 | * |
2038 | * Return 0 on success or else a negative value. | |
ffe60014 | 2039 | */ |
d41f73b7 MD |
2040 | int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream) |
2041 | { | |
fe4477ee JD |
2042 | int ret; |
2043 | ||
10a50311 JD |
2044 | assert(stream); |
2045 | ||
fe4477ee | 2046 | /* Don't create anything if this is set for streaming. */ |
10a50311 | 2047 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { |
fe4477ee JD |
2048 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
2049 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
309167d2 | 2050 | stream->uid, stream->gid, NULL); |
fe4477ee JD |
2051 | if (ret < 0) { |
2052 | goto error; | |
2053 | } | |
2054 | stream->out_fd = ret; | |
2055 | stream->tracefile_size_current = 0; | |
309167d2 JD |
2056 | |
2057 | if (!stream->metadata_flag) { | |
2058 | ret = index_create_file(stream->chan->pathname, | |
2059 | stream->name, stream->uid, stream->gid, | |
2060 | stream->chan->tracefile_size, | |
2061 | stream->tracefile_count_current); | |
2062 | if (ret < 0) { | |
2063 | goto error; | |
2064 | } | |
2065 | stream->index_fd = ret; | |
2066 | } | |
fe4477ee JD |
2067 | } |
2068 | ret = 0; | |
2069 | ||
2070 | error: | |
2071 | return ret; | |
d41f73b7 | 2072 | } |
ca22feea DG |
2073 | |
2074 | /* | |
2075 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
2076 | * stream. Consumer data lock MUST be acquired before calling this function |
2077 | * and the stream lock. | |
ca22feea | 2078 | * |
6d805429 | 2079 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
2080 | * data is available for trace viewer reading. |
2081 | */ | |
6d805429 | 2082 | int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
2083 | { |
2084 | int ret; | |
2085 | ||
2086 | assert(stream); | |
ffe60014 | 2087 | assert(stream->ustream); |
ca22feea | 2088 | |
6d805429 | 2089 | DBG("UST consumer checking data pending"); |
c8f59ee5 | 2090 | |
ca6b395f MD |
2091 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
2092 | ret = 0; | |
2093 | goto end; | |
2094 | } | |
2095 | ||
04ef1097 | 2096 | if (stream->chan->type == CONSUMER_CHANNEL_TYPE_METADATA) { |
e6ee4eab DG |
2097 | uint64_t contiguous, pushed; |
2098 | ||
2099 | /* Ease our life a bit. */ | |
2100 | contiguous = stream->chan->metadata_cache->contiguous; | |
2101 | pushed = stream->ust_metadata_pushed; | |
2102 | ||
04ef1097 MD |
2103 | /* |
2104 | * We can simply check whether all contiguously available data | |
2105 | * has been pushed to the ring buffer, since the push operation | |
2106 | * is performed within get_next_subbuf(), and because both | |
2107 | * get_next_subbuf() and put_next_subbuf() are issued atomically | |
2108 | * thanks to the stream lock within | |
2109 | * lttng_ustconsumer_read_subbuffer(). This basically means that | |
2110 | * whetnever ust_metadata_pushed is incremented, the associated | |
2111 | * metadata has been consumed from the metadata stream. | |
2112 | */ | |
2113 | DBG("UST consumer metadata pending check: contiguous %" PRIu64 " vs pushed %" PRIu64, | |
e6ee4eab | 2114 | contiguous, pushed); |
6acdf328 | 2115 | assert(((int64_t) contiguous - pushed) >= 0); |
e6ee4eab | 2116 | if ((contiguous != pushed) || |
6acdf328 | 2117 | (((int64_t) contiguous - pushed) > 0 || contiguous == 0)) { |
04ef1097 MD |
2118 | ret = 1; /* Data is pending */ |
2119 | goto end; | |
2120 | } | |
2121 | } else { | |
2122 | ret = ustctl_get_next_subbuf(stream->ustream); | |
2123 | if (ret == 0) { | |
2124 | /* | |
2125 | * There is still data so let's put back this | |
2126 | * subbuffer. | |
2127 | */ | |
2128 | ret = ustctl_put_subbuf(stream->ustream); | |
2129 | assert(ret == 0); | |
2130 | ret = 1; /* Data is pending */ | |
2131 | goto end; | |
2132 | } | |
ca22feea DG |
2133 | } |
2134 | ||
6d805429 DG |
2135 | /* Data is NOT pending so ready to be read. */ |
2136 | ret = 0; | |
ca22feea | 2137 | |
6efae65e DG |
2138 | end: |
2139 | return ret; | |
ca22feea | 2140 | } |
d88aee68 DG |
2141 | |
2142 | /* | |
2143 | * Close every metadata stream wait fd of the metadata hash table. This | |
2144 | * function MUST be used very carefully so not to run into a race between the | |
2145 | * metadata thread handling streams and this function closing their wait fd. | |
2146 | * | |
2147 | * For UST, this is used when the session daemon hangs up. Its the metadata | |
2148 | * producer so calling this is safe because we are assured that no state change | |
2149 | * can occur in the metadata thread for the streams in the hash table. | |
2150 | */ | |
2151 | void lttng_ustconsumer_close_metadata(struct lttng_ht *metadata_ht) | |
2152 | { | |
d88aee68 DG |
2153 | struct lttng_ht_iter iter; |
2154 | struct lttng_consumer_stream *stream; | |
2155 | ||
2156 | assert(metadata_ht); | |
2157 | assert(metadata_ht->ht); | |
2158 | ||
2159 | DBG("UST consumer closing all metadata streams"); | |
2160 | ||
2161 | rcu_read_lock(); | |
2162 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, | |
2163 | node.node) { | |
9ce5646a MD |
2164 | |
2165 | health_code_update(); | |
2166 | ||
be2b50c7 | 2167 | pthread_mutex_lock(&stream->chan->lock); |
d88aee68 | 2168 | /* |
be2b50c7 DG |
2169 | * Whatever returned value, we must continue to try to close everything |
2170 | * so ignore it. | |
d88aee68 | 2171 | */ |
be2b50c7 DG |
2172 | (void) _close_metadata(stream->chan); |
2173 | DBG("Metadata wait fd %d and poll pipe fd %d closed", stream->wait_fd, | |
2174 | stream->ust_metadata_poll_pipe[1]); | |
2175 | pthread_mutex_unlock(&stream->chan->lock); | |
2176 | ||
d88aee68 DG |
2177 | } |
2178 | rcu_read_unlock(); | |
2179 | } | |
d8ef542d MD |
2180 | |
2181 | void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream) | |
2182 | { | |
2183 | int ret; | |
2184 | ||
2185 | ret = ustctl_stream_close_wakeup_fd(stream->ustream); | |
2186 | if (ret < 0) { | |
2187 | ERR("Unable to close wakeup fd"); | |
2188 | } | |
2189 | } | |
331744e3 | 2190 | |
f666ae70 MD |
2191 | /* |
2192 | * Please refer to consumer-timer.c before adding any lock within this | |
2193 | * function or any of its callees. Timers have a very strict locking | |
2194 | * semantic with respect to teardown. Failure to respect this semantic | |
2195 | * introduces deadlocks. | |
2196 | */ | |
331744e3 | 2197 | int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx, |
94d49140 | 2198 | struct lttng_consumer_channel *channel, int timer, int wait) |
331744e3 JD |
2199 | { |
2200 | struct lttcomm_metadata_request_msg request; | |
2201 | struct lttcomm_consumer_msg msg; | |
0c759fc9 | 2202 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
331744e3 JD |
2203 | uint64_t len, key, offset; |
2204 | int ret; | |
2205 | ||
2206 | assert(channel); | |
2207 | assert(channel->metadata_cache); | |
2208 | ||
2209 | /* send the metadata request to sessiond */ | |
2210 | switch (consumer_data.type) { | |
2211 | case LTTNG_CONSUMER64_UST: | |
2212 | request.bits_per_long = 64; | |
2213 | break; | |
2214 | case LTTNG_CONSUMER32_UST: | |
2215 | request.bits_per_long = 32; | |
2216 | break; | |
2217 | default: | |
2218 | request.bits_per_long = 0; | |
2219 | break; | |
2220 | } | |
2221 | ||
2222 | request.session_id = channel->session_id; | |
1950109e | 2223 | request.session_id_per_pid = channel->session_id_per_pid; |
567eb353 DG |
2224 | /* |
2225 | * Request the application UID here so the metadata of that application can | |
2226 | * be sent back. The channel UID corresponds to the user UID of the session | |
2227 | * used for the rights on the stream file(s). | |
2228 | */ | |
2229 | request.uid = channel->ust_app_uid; | |
331744e3 | 2230 | request.key = channel->key; |
567eb353 | 2231 | |
1950109e | 2232 | DBG("Sending metadata request to sessiond, session id %" PRIu64 |
567eb353 DG |
2233 | ", per-pid %" PRIu64 ", app UID %u and channek key %" PRIu64, |
2234 | request.session_id, request.session_id_per_pid, request.uid, | |
2235 | request.key); | |
331744e3 | 2236 | |
75d83e50 | 2237 | pthread_mutex_lock(&ctx->metadata_socket_lock); |
9ce5646a MD |
2238 | |
2239 | health_code_update(); | |
2240 | ||
331744e3 JD |
2241 | ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request, |
2242 | sizeof(request)); | |
2243 | if (ret < 0) { | |
2244 | ERR("Asking metadata to sessiond"); | |
2245 | goto end; | |
2246 | } | |
2247 | ||
9ce5646a MD |
2248 | health_code_update(); |
2249 | ||
331744e3 JD |
2250 | /* Receive the metadata from sessiond */ |
2251 | ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg, | |
2252 | sizeof(msg)); | |
2253 | if (ret != sizeof(msg)) { | |
8fd623e0 | 2254 | DBG("Consumer received unexpected message size %d (expects %zu)", |
331744e3 JD |
2255 | ret, sizeof(msg)); |
2256 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); | |
2257 | /* | |
2258 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
2259 | * since the caller handles this. | |
2260 | */ | |
2261 | goto end; | |
2262 | } | |
2263 | ||
9ce5646a MD |
2264 | health_code_update(); |
2265 | ||
331744e3 JD |
2266 | if (msg.cmd_type == LTTNG_ERR_UND) { |
2267 | /* No registry found */ | |
2268 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, | |
2269 | ret_code); | |
2270 | ret = 0; | |
2271 | goto end; | |
2272 | } else if (msg.cmd_type != LTTNG_CONSUMER_PUSH_METADATA) { | |
2273 | ERR("Unexpected cmd_type received %d", msg.cmd_type); | |
2274 | ret = -1; | |
2275 | goto end; | |
2276 | } | |
2277 | ||
2278 | len = msg.u.push_metadata.len; | |
2279 | key = msg.u.push_metadata.key; | |
2280 | offset = msg.u.push_metadata.target_offset; | |
2281 | ||
2282 | assert(key == channel->key); | |
2283 | if (len == 0) { | |
2284 | DBG("No new metadata to receive for key %" PRIu64, key); | |
2285 | } | |
2286 | ||
9ce5646a MD |
2287 | health_code_update(); |
2288 | ||
331744e3 JD |
2289 | /* Tell session daemon we are ready to receive the metadata. */ |
2290 | ret = consumer_send_status_msg(ctx->consumer_metadata_socket, | |
0c759fc9 | 2291 | LTTCOMM_CONSUMERD_SUCCESS); |
331744e3 JD |
2292 | if (ret < 0 || len == 0) { |
2293 | /* | |
2294 | * Somehow, the session daemon is not responding anymore or there is | |
2295 | * nothing to receive. | |
2296 | */ | |
2297 | goto end; | |
2298 | } | |
2299 | ||
9ce5646a MD |
2300 | health_code_update(); |
2301 | ||
1eb682be | 2302 | ret = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket, |
94d49140 | 2303 | key, offset, len, channel, timer, wait); |
1eb682be | 2304 | if (ret >= 0) { |
f2a444f1 DG |
2305 | /* |
2306 | * Only send the status msg if the sessiond is alive meaning a positive | |
2307 | * ret code. | |
2308 | */ | |
1eb682be | 2309 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret); |
f2a444f1 | 2310 | } |
331744e3 JD |
2311 | ret = 0; |
2312 | ||
2313 | end: | |
9ce5646a MD |
2314 | health_code_update(); |
2315 | ||
75d83e50 | 2316 | pthread_mutex_unlock(&ctx->metadata_socket_lock); |
331744e3 JD |
2317 | return ret; |
2318 | } |