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 | } | |
f2a444f1 | 441 | } |
ffe60014 | 442 | |
f2a444f1 DG |
443 | /* Inform sessiond that we are about to send channel and streams. */ |
444 | ret = consumer_send_status_msg(sock, ret_code); | |
0c759fc9 | 445 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
446 | /* |
447 | * Either the session daemon is not responding or the relayd died so we | |
448 | * stop now. | |
449 | */ | |
450 | goto error; | |
451 | } | |
452 | ||
453 | /* Send channel to sessiond. */ | |
454 | ret = ustctl_send_channel_to_sessiond(sock, channel->uchan); | |
455 | if (ret < 0) { | |
456 | goto error; | |
457 | } | |
458 | ||
459 | ret = ustctl_channel_close_wakeup_fd(channel->uchan); | |
460 | if (ret < 0) { | |
461 | goto error; | |
462 | } | |
463 | ||
464 | /* The channel was sent successfully to the sessiond at this point. */ | |
465 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
466 | |
467 | health_code_update(); | |
468 | ||
ffe60014 DG |
469 | /* Send stream to session daemon. */ |
470 | ret = send_sessiond_stream(sock, stream); | |
471 | if (ret < 0) { | |
472 | goto error; | |
473 | } | |
474 | } | |
475 | ||
476 | /* Tell sessiond there is no more stream. */ | |
477 | ret = ustctl_send_stream_to_sessiond(sock, NULL); | |
478 | if (ret < 0) { | |
479 | goto error; | |
480 | } | |
481 | ||
482 | DBG("UST consumer NULL stream sent to sessiond"); | |
483 | ||
484 | return 0; | |
485 | ||
486 | error: | |
0c759fc9 | 487 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
488 | ret = -1; |
489 | } | |
ffe60014 DG |
490 | return ret; |
491 | } | |
492 | ||
493 | /* | |
494 | * Creates a channel and streams and add the channel it to the channel internal | |
495 | * state. The created stream must ONLY be sent once the GET_CHANNEL command is | |
496 | * received. | |
497 | * | |
498 | * Return 0 on success or else, a negative value is returned and the channel | |
499 | * MUST be destroyed by consumer_del_channel(). | |
500 | */ | |
501 | static int ask_channel(struct lttng_consumer_local_data *ctx, int sock, | |
502 | struct lttng_consumer_channel *channel, | |
503 | struct ustctl_consumer_channel_attr *attr) | |
3bd1e081 MD |
504 | { |
505 | int ret; | |
506 | ||
ffe60014 DG |
507 | assert(ctx); |
508 | assert(channel); | |
509 | assert(attr); | |
510 | ||
511 | /* | |
512 | * This value is still used by the kernel consumer since for the kernel, | |
513 | * the stream ownership is not IN the consumer so we need to have the | |
514 | * number of left stream that needs to be initialized so we can know when | |
515 | * to delete the channel (see consumer.c). | |
516 | * | |
517 | * As for the user space tracer now, the consumer creates and sends the | |
518 | * stream to the session daemon which only sends them to the application | |
519 | * once every stream of a channel is received making this value useless | |
520 | * because we they will be added to the poll thread before the application | |
521 | * receives them. This ensures that a stream can not hang up during | |
522 | * initilization of a channel. | |
523 | */ | |
524 | channel->nb_init_stream_left = 0; | |
525 | ||
526 | /* The reply msg status is handled in the following call. */ | |
527 | ret = create_ust_channel(attr, &channel->uchan); | |
528 | if (ret < 0) { | |
10a50311 | 529 | goto end; |
3bd1e081 MD |
530 | } |
531 | ||
d8ef542d MD |
532 | channel->wait_fd = ustctl_channel_get_wait_fd(channel->uchan); |
533 | ||
10a50311 JD |
534 | /* |
535 | * For the snapshots (no monitor), we create the metadata streams | |
536 | * on demand, not during the channel creation. | |
537 | */ | |
538 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && !channel->monitor) { | |
539 | ret = 0; | |
540 | goto end; | |
541 | } | |
542 | ||
ffe60014 DG |
543 | /* Open all streams for this channel. */ |
544 | ret = create_ust_streams(channel, ctx); | |
545 | if (ret < 0) { | |
10a50311 | 546 | goto end; |
ffe60014 DG |
547 | } |
548 | ||
10a50311 | 549 | end: |
3bd1e081 MD |
550 | return ret; |
551 | } | |
552 | ||
d88aee68 DG |
553 | /* |
554 | * Send all stream of a channel to the right thread handling it. | |
555 | * | |
556 | * On error, return a negative value else 0 on success. | |
557 | */ | |
558 | static int send_streams_to_thread(struct lttng_consumer_channel *channel, | |
559 | struct lttng_consumer_local_data *ctx) | |
560 | { | |
561 | int ret = 0; | |
562 | struct lttng_consumer_stream *stream, *stmp; | |
563 | ||
564 | assert(channel); | |
565 | assert(ctx); | |
566 | ||
567 | /* Send streams to the corresponding thread. */ | |
568 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
569 | send_node) { | |
9ce5646a MD |
570 | |
571 | health_code_update(); | |
572 | ||
d88aee68 DG |
573 | /* Sending the stream to the thread. */ |
574 | ret = send_stream_to_thread(stream, ctx); | |
575 | if (ret < 0) { | |
576 | /* | |
577 | * If we are unable to send the stream to the thread, there is | |
578 | * a big problem so just stop everything. | |
579 | */ | |
5ab66908 MD |
580 | /* Remove node from the channel stream list. */ |
581 | cds_list_del(&stream->send_node); | |
d88aee68 DG |
582 | goto error; |
583 | } | |
584 | ||
585 | /* Remove node from the channel stream list. */ | |
586 | cds_list_del(&stream->send_node); | |
4891ece8 | 587 | |
d88aee68 DG |
588 | } |
589 | ||
590 | error: | |
591 | return ret; | |
592 | } | |
593 | ||
7972aab2 DG |
594 | /* |
595 | * Flush channel's streams using the given key to retrieve the channel. | |
596 | * | |
597 | * Return 0 on success else an LTTng error code. | |
598 | */ | |
599 | static int flush_channel(uint64_t chan_key) | |
600 | { | |
601 | int ret = 0; | |
602 | struct lttng_consumer_channel *channel; | |
603 | struct lttng_consumer_stream *stream; | |
604 | struct lttng_ht *ht; | |
605 | struct lttng_ht_iter iter; | |
606 | ||
8fd623e0 | 607 | DBG("UST consumer flush channel key %" PRIu64, chan_key); |
7972aab2 | 608 | |
a500c257 | 609 | rcu_read_lock(); |
7972aab2 DG |
610 | channel = consumer_find_channel(chan_key); |
611 | if (!channel) { | |
8fd623e0 | 612 | ERR("UST consumer flush channel %" PRIu64 " not found", chan_key); |
7972aab2 DG |
613 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
614 | goto error; | |
615 | } | |
616 | ||
617 | ht = consumer_data.stream_per_chan_id_ht; | |
618 | ||
619 | /* For each stream of the channel id, flush it. */ | |
7972aab2 DG |
620 | cds_lfht_for_each_entry_duplicate(ht->ht, |
621 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
622 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
9ce5646a MD |
623 | |
624 | health_code_update(); | |
625 | ||
b8086166 | 626 | ustctl_flush_buffer(stream->ustream, 1); |
7972aab2 | 627 | } |
7972aab2 | 628 | error: |
a500c257 | 629 | rcu_read_unlock(); |
7972aab2 DG |
630 | return ret; |
631 | } | |
be2b50c7 DG |
632 | /* |
633 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. | |
634 | * RCU read side lock MUST be acquired before calling this function. | |
635 | * | |
636 | * NOTE: This function does NOT take any channel nor stream lock. | |
637 | * | |
638 | * Return 0 on success else LTTng error code. | |
639 | */ | |
640 | static int _close_metadata(struct lttng_consumer_channel *channel) | |
641 | { | |
0c759fc9 | 642 | int ret = LTTCOMM_CONSUMERD_SUCCESS; |
be2b50c7 DG |
643 | |
644 | assert(channel); | |
645 | assert(channel->type == CONSUMER_CHANNEL_TYPE_METADATA); | |
646 | ||
647 | if (channel->switch_timer_enabled == 1) { | |
648 | DBG("Deleting timer on metadata channel"); | |
649 | consumer_timer_switch_stop(channel); | |
650 | } | |
651 | ||
652 | if (channel->metadata_stream) { | |
653 | ret = ustctl_stream_close_wakeup_fd(channel->metadata_stream->ustream); | |
654 | if (ret < 0) { | |
655 | ERR("UST consumer unable to close fd of metadata (ret: %d)", ret); | |
656 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
657 | } | |
658 | ||
659 | if (channel->monitor) { | |
660 | /* Close the read-side in consumer_del_metadata_stream */ | |
661 | ret = close(channel->metadata_stream->ust_metadata_poll_pipe[1]); | |
662 | if (ret < 0) { | |
663 | PERROR("Close UST metadata write-side poll pipe"); | |
664 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
665 | } | |
666 | } | |
667 | } | |
668 | ||
669 | return ret; | |
670 | } | |
7972aab2 | 671 | |
d88aee68 DG |
672 | /* |
673 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. | |
a500c257 | 674 | * RCU read side lock MUST be acquired before calling this function. |
d88aee68 DG |
675 | * |
676 | * Return 0 on success else an LTTng error code. | |
677 | */ | |
678 | static int close_metadata(uint64_t chan_key) | |
679 | { | |
ea88ca2a | 680 | int ret = 0; |
d88aee68 DG |
681 | struct lttng_consumer_channel *channel; |
682 | ||
8fd623e0 | 683 | DBG("UST consumer close metadata key %" PRIu64, chan_key); |
d88aee68 DG |
684 | |
685 | channel = consumer_find_channel(chan_key); | |
686 | if (!channel) { | |
84cc9aa0 DG |
687 | /* |
688 | * This is possible if the metadata thread has issue a delete because | |
689 | * the endpoint point of the stream hung up. There is no way the | |
690 | * session daemon can know about it thus use a DBG instead of an actual | |
691 | * error. | |
692 | */ | |
693 | DBG("UST consumer close metadata %" PRIu64 " not found", chan_key); | |
d88aee68 DG |
694 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
695 | goto error; | |
696 | } | |
697 | ||
ea88ca2a | 698 | pthread_mutex_lock(&consumer_data.lock); |
a9838785 | 699 | pthread_mutex_lock(&channel->lock); |
73811ecc DG |
700 | |
701 | if (cds_lfht_is_node_deleted(&channel->node.node)) { | |
702 | goto error_unlock; | |
703 | } | |
704 | ||
be2b50c7 | 705 | ret = _close_metadata(channel); |
d88aee68 | 706 | |
ea88ca2a | 707 | error_unlock: |
a9838785 | 708 | pthread_mutex_unlock(&channel->lock); |
ea88ca2a | 709 | pthread_mutex_unlock(&consumer_data.lock); |
d88aee68 DG |
710 | error: |
711 | return ret; | |
712 | } | |
713 | ||
714 | /* | |
715 | * RCU read side lock MUST be acquired before calling this function. | |
716 | * | |
717 | * Return 0 on success else an LTTng error code. | |
718 | */ | |
719 | static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key) | |
720 | { | |
721 | int ret; | |
722 | struct lttng_consumer_channel *metadata; | |
723 | ||
8fd623e0 | 724 | DBG("UST consumer setup metadata key %" PRIu64, key); |
d88aee68 DG |
725 | |
726 | metadata = consumer_find_channel(key); | |
727 | if (!metadata) { | |
728 | ERR("UST consumer push metadata %" PRIu64 " not found", key); | |
729 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
10a50311 JD |
730 | goto end; |
731 | } | |
732 | ||
733 | /* | |
734 | * In no monitor mode, the metadata channel has no stream(s) so skip the | |
735 | * ownership transfer to the metadata thread. | |
736 | */ | |
737 | if (!metadata->monitor) { | |
738 | DBG("Metadata channel in no monitor"); | |
739 | ret = 0; | |
740 | goto end; | |
d88aee68 DG |
741 | } |
742 | ||
743 | /* | |
744 | * Send metadata stream to relayd if one available. Availability is | |
745 | * known if the stream is still in the list of the channel. | |
746 | */ | |
747 | if (cds_list_empty(&metadata->streams.head)) { | |
748 | ERR("Metadata channel key %" PRIu64 ", no stream available.", key); | |
749 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
f5a0c9cf | 750 | goto error_no_stream; |
d88aee68 DG |
751 | } |
752 | ||
753 | /* Send metadata stream to relayd if needed. */ | |
62285ea4 DG |
754 | if (metadata->metadata_stream->net_seq_idx != (uint64_t) -1ULL) { |
755 | ret = consumer_send_relayd_stream(metadata->metadata_stream, | |
756 | metadata->pathname); | |
757 | if (ret < 0) { | |
758 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
759 | goto error; | |
760 | } | |
601262d6 JD |
761 | ret = consumer_send_relayd_streams_sent( |
762 | metadata->metadata_stream->net_seq_idx); | |
763 | if (ret < 0) { | |
764 | ret = LTTCOMM_CONSUMERD_RELAYD_FAIL; | |
765 | goto error; | |
766 | } | |
d88aee68 DG |
767 | } |
768 | ||
769 | ret = send_streams_to_thread(metadata, ctx); | |
770 | if (ret < 0) { | |
771 | /* | |
772 | * If we are unable to send the stream to the thread, there is | |
773 | * a big problem so just stop everything. | |
774 | */ | |
775 | ret = LTTCOMM_CONSUMERD_FATAL; | |
776 | goto error; | |
777 | } | |
778 | /* List MUST be empty after or else it could be reused. */ | |
779 | assert(cds_list_empty(&metadata->streams.head)); | |
780 | ||
10a50311 JD |
781 | ret = 0; |
782 | goto end; | |
d88aee68 DG |
783 | |
784 | error: | |
f2a444f1 DG |
785 | /* |
786 | * Delete metadata channel on error. At this point, the metadata stream can | |
787 | * NOT be monitored by the metadata thread thus having the guarantee that | |
788 | * the stream is still in the local stream list of the channel. This call | |
789 | * will make sure to clean that list. | |
790 | */ | |
f5a0c9cf DG |
791 | cds_list_del(&metadata->metadata_stream->send_node); |
792 | consumer_stream_destroy(metadata->metadata_stream, NULL); | |
793 | error_no_stream: | |
10a50311 JD |
794 | end: |
795 | return ret; | |
796 | } | |
797 | ||
798 | /* | |
799 | * Snapshot the whole metadata. | |
800 | * | |
801 | * Returns 0 on success, < 0 on error | |
802 | */ | |
803 | static int snapshot_metadata(uint64_t key, char *path, uint64_t relayd_id, | |
804 | struct lttng_consumer_local_data *ctx) | |
805 | { | |
806 | int ret = 0; | |
10a50311 JD |
807 | struct lttng_consumer_channel *metadata_channel; |
808 | struct lttng_consumer_stream *metadata_stream; | |
809 | ||
810 | assert(path); | |
811 | assert(ctx); | |
812 | ||
813 | DBG("UST consumer snapshot metadata with key %" PRIu64 " at path %s", | |
814 | key, path); | |
815 | ||
816 | rcu_read_lock(); | |
817 | ||
818 | metadata_channel = consumer_find_channel(key); | |
819 | if (!metadata_channel) { | |
6a00837f MD |
820 | ERR("UST snapshot metadata channel not found for key %" PRIu64, |
821 | key); | |
10a50311 JD |
822 | ret = -1; |
823 | goto error; | |
824 | } | |
825 | assert(!metadata_channel->monitor); | |
826 | ||
9ce5646a MD |
827 | health_code_update(); |
828 | ||
10a50311 JD |
829 | /* |
830 | * Ask the sessiond if we have new metadata waiting and update the | |
831 | * consumer metadata cache. | |
832 | */ | |
94d49140 | 833 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 1); |
10a50311 JD |
834 | if (ret < 0) { |
835 | goto error; | |
836 | } | |
837 | ||
9ce5646a MD |
838 | health_code_update(); |
839 | ||
10a50311 JD |
840 | /* |
841 | * The metadata stream is NOT created in no monitor mode when the channel | |
842 | * is created on a sessiond ask channel command. | |
843 | */ | |
844 | ret = create_ust_streams(metadata_channel, ctx); | |
845 | if (ret < 0) { | |
846 | goto error; | |
847 | } | |
848 | ||
849 | metadata_stream = metadata_channel->metadata_stream; | |
850 | assert(metadata_stream); | |
851 | ||
852 | if (relayd_id != (uint64_t) -1ULL) { | |
853 | metadata_stream->net_seq_idx = relayd_id; | |
854 | ret = consumer_send_relayd_stream(metadata_stream, path); | |
855 | if (ret < 0) { | |
856 | goto error_stream; | |
857 | } | |
858 | } else { | |
859 | ret = utils_create_stream_file(path, metadata_stream->name, | |
860 | metadata_stream->chan->tracefile_size, | |
861 | metadata_stream->tracefile_count_current, | |
309167d2 | 862 | metadata_stream->uid, metadata_stream->gid, NULL); |
10a50311 JD |
863 | if (ret < 0) { |
864 | goto error_stream; | |
865 | } | |
866 | metadata_stream->out_fd = ret; | |
867 | metadata_stream->tracefile_size_current = 0; | |
868 | } | |
869 | ||
04ef1097 | 870 | do { |
9ce5646a MD |
871 | health_code_update(); |
872 | ||
10a50311 JD |
873 | ret = lttng_consumer_read_subbuffer(metadata_stream, ctx); |
874 | if (ret < 0) { | |
94d49140 | 875 | goto error_stream; |
10a50311 | 876 | } |
04ef1097 | 877 | } while (ret > 0); |
10a50311 | 878 | |
10a50311 JD |
879 | error_stream: |
880 | /* | |
881 | * Clean up the stream completly because the next snapshot will use a new | |
882 | * metadata stream. | |
883 | */ | |
884 | cds_list_del(&metadata_stream->send_node); | |
885 | consumer_stream_destroy(metadata_stream, NULL); | |
886 | metadata_channel->metadata_stream = NULL; | |
887 | ||
888 | error: | |
889 | rcu_read_unlock(); | |
890 | return ret; | |
891 | } | |
892 | ||
893 | /* | |
894 | * Take a snapshot of all the stream of a channel. | |
895 | * | |
896 | * Returns 0 on success, < 0 on error | |
897 | */ | |
898 | static int snapshot_channel(uint64_t key, char *path, uint64_t relayd_id, | |
5c786ded | 899 | uint64_t max_stream_size, struct lttng_consumer_local_data *ctx) |
10a50311 JD |
900 | { |
901 | int ret; | |
902 | unsigned use_relayd = 0; | |
903 | unsigned long consumed_pos, produced_pos; | |
904 | struct lttng_consumer_channel *channel; | |
905 | struct lttng_consumer_stream *stream; | |
906 | ||
907 | assert(path); | |
908 | assert(ctx); | |
909 | ||
910 | rcu_read_lock(); | |
911 | ||
912 | if (relayd_id != (uint64_t) -1ULL) { | |
913 | use_relayd = 1; | |
914 | } | |
915 | ||
916 | channel = consumer_find_channel(key); | |
917 | if (!channel) { | |
6a00837f | 918 | ERR("UST snapshot channel not found for key %" PRIu64, key); |
10a50311 JD |
919 | ret = -1; |
920 | goto error; | |
921 | } | |
922 | assert(!channel->monitor); | |
6a00837f | 923 | DBG("UST consumer snapshot channel %" PRIu64, key); |
10a50311 JD |
924 | |
925 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
926 | |
927 | health_code_update(); | |
928 | ||
10a50311 JD |
929 | /* Lock stream because we are about to change its state. */ |
930 | pthread_mutex_lock(&stream->lock); | |
931 | stream->net_seq_idx = relayd_id; | |
932 | ||
933 | if (use_relayd) { | |
934 | ret = consumer_send_relayd_stream(stream, path); | |
935 | if (ret < 0) { | |
936 | goto error_unlock; | |
937 | } | |
938 | } else { | |
939 | ret = utils_create_stream_file(path, stream->name, | |
940 | stream->chan->tracefile_size, | |
941 | stream->tracefile_count_current, | |
309167d2 | 942 | stream->uid, stream->gid, NULL); |
10a50311 JD |
943 | if (ret < 0) { |
944 | goto error_unlock; | |
945 | } | |
946 | stream->out_fd = ret; | |
947 | stream->tracefile_size_current = 0; | |
948 | ||
949 | DBG("UST consumer snapshot stream %s/%s (%" PRIu64 ")", path, | |
950 | stream->name, stream->key); | |
951 | } | |
a4baae1b JD |
952 | if (relayd_id != -1ULL) { |
953 | ret = consumer_send_relayd_streams_sent(relayd_id); | |
954 | if (ret < 0) { | |
955 | goto error_unlock; | |
956 | } | |
957 | } | |
10a50311 JD |
958 | |
959 | ustctl_flush_buffer(stream->ustream, 1); | |
960 | ||
961 | ret = lttng_ustconsumer_take_snapshot(stream); | |
962 | if (ret < 0) { | |
963 | ERR("Taking UST snapshot"); | |
964 | goto error_unlock; | |
965 | } | |
966 | ||
967 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); | |
968 | if (ret < 0) { | |
969 | ERR("Produced UST snapshot position"); | |
970 | goto error_unlock; | |
971 | } | |
972 | ||
973 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
974 | if (ret < 0) { | |
975 | ERR("Consumerd UST snapshot position"); | |
976 | goto error_unlock; | |
977 | } | |
978 | ||
5c786ded JD |
979 | /* |
980 | * The original value is sent back if max stream size is larger than | |
981 | * the possible size of the snapshot. Also, we asume that the session | |
982 | * daemon should never send a maximum stream size that is lower than | |
983 | * subbuffer size. | |
984 | */ | |
985 | consumed_pos = consumer_get_consumed_maxsize(consumed_pos, | |
986 | produced_pos, max_stream_size); | |
987 | ||
10a50311 JD |
988 | while (consumed_pos < produced_pos) { |
989 | ssize_t read_len; | |
990 | unsigned long len, padded_len; | |
991 | ||
9ce5646a MD |
992 | health_code_update(); |
993 | ||
10a50311 JD |
994 | DBG("UST consumer taking snapshot at pos %lu", consumed_pos); |
995 | ||
996 | ret = ustctl_get_subbuf(stream->ustream, &consumed_pos); | |
997 | if (ret < 0) { | |
998 | if (ret != -EAGAIN) { | |
999 | PERROR("ustctl_get_subbuf snapshot"); | |
1000 | goto error_close_stream; | |
1001 | } | |
1002 | DBG("UST consumer get subbuf failed. Skipping it."); | |
1003 | consumed_pos += stream->max_sb_size; | |
1004 | continue; | |
1005 | } | |
1006 | ||
1007 | ret = ustctl_get_subbuf_size(stream->ustream, &len); | |
1008 | if (ret < 0) { | |
1009 | ERR("Snapshot ustctl_get_subbuf_size"); | |
1010 | goto error_put_subbuf; | |
1011 | } | |
1012 | ||
1013 | ret = ustctl_get_padded_subbuf_size(stream->ustream, &padded_len); | |
1014 | if (ret < 0) { | |
1015 | ERR("Snapshot ustctl_get_padded_subbuf_size"); | |
1016 | goto error_put_subbuf; | |
1017 | } | |
1018 | ||
1019 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
309167d2 | 1020 | padded_len - len, NULL); |
10a50311 JD |
1021 | if (use_relayd) { |
1022 | if (read_len != len) { | |
56591bac | 1023 | ret = -EPERM; |
10a50311 JD |
1024 | goto error_put_subbuf; |
1025 | } | |
1026 | } else { | |
1027 | if (read_len != padded_len) { | |
56591bac | 1028 | ret = -EPERM; |
10a50311 JD |
1029 | goto error_put_subbuf; |
1030 | } | |
1031 | } | |
1032 | ||
1033 | ret = ustctl_put_subbuf(stream->ustream); | |
1034 | if (ret < 0) { | |
1035 | ERR("Snapshot ustctl_put_subbuf"); | |
1036 | goto error_close_stream; | |
1037 | } | |
1038 | consumed_pos += stream->max_sb_size; | |
1039 | } | |
1040 | ||
1041 | /* Simply close the stream so we can use it on the next snapshot. */ | |
1042 | consumer_stream_close(stream); | |
1043 | pthread_mutex_unlock(&stream->lock); | |
1044 | } | |
1045 | ||
1046 | rcu_read_unlock(); | |
1047 | return 0; | |
1048 | ||
1049 | error_put_subbuf: | |
1050 | if (ustctl_put_subbuf(stream->ustream) < 0) { | |
1051 | ERR("Snapshot ustctl_put_subbuf"); | |
1052 | } | |
1053 | error_close_stream: | |
1054 | consumer_stream_close(stream); | |
1055 | error_unlock: | |
1056 | pthread_mutex_unlock(&stream->lock); | |
1057 | error: | |
1058 | rcu_read_unlock(); | |
d88aee68 DG |
1059 | return ret; |
1060 | } | |
1061 | ||
331744e3 JD |
1062 | /* |
1063 | * Receive the metadata updates from the sessiond. | |
1064 | */ | |
1065 | int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset, | |
5e41ebe1 | 1066 | uint64_t len, struct lttng_consumer_channel *channel, |
94d49140 | 1067 | int timer, int wait) |
331744e3 | 1068 | { |
0c759fc9 | 1069 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
331744e3 JD |
1070 | char *metadata_str; |
1071 | ||
8fd623e0 | 1072 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len); |
331744e3 JD |
1073 | |
1074 | metadata_str = zmalloc(len * sizeof(char)); | |
1075 | if (!metadata_str) { | |
1076 | PERROR("zmalloc metadata string"); | |
1077 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; | |
1078 | goto end; | |
1079 | } | |
1080 | ||
9ce5646a MD |
1081 | health_code_update(); |
1082 | ||
331744e3 JD |
1083 | /* Receive metadata string. */ |
1084 | ret = lttcomm_recv_unix_sock(sock, metadata_str, len); | |
1085 | if (ret < 0) { | |
1086 | /* Session daemon is dead so return gracefully. */ | |
1087 | ret_code = ret; | |
1088 | goto end_free; | |
1089 | } | |
1090 | ||
9ce5646a MD |
1091 | health_code_update(); |
1092 | ||
331744e3 JD |
1093 | pthread_mutex_lock(&channel->metadata_cache->lock); |
1094 | ret = consumer_metadata_cache_write(channel, offset, len, metadata_str); | |
1095 | if (ret < 0) { | |
1096 | /* Unable to handle metadata. Notify session daemon. */ | |
1097 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
a32bd775 DG |
1098 | /* |
1099 | * Skip metadata flush on write error since the offset and len might | |
1100 | * not have been updated which could create an infinite loop below when | |
1101 | * waiting for the metadata cache to be flushed. | |
1102 | */ | |
1103 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
a32bd775 | 1104 | goto end_free; |
331744e3 JD |
1105 | } |
1106 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
1107 | ||
94d49140 JD |
1108 | if (!wait) { |
1109 | goto end_free; | |
1110 | } | |
5e41ebe1 | 1111 | while (consumer_metadata_cache_flushed(channel, offset + len, timer)) { |
331744e3 | 1112 | DBG("Waiting for metadata to be flushed"); |
9ce5646a MD |
1113 | |
1114 | health_code_update(); | |
1115 | ||
331744e3 JD |
1116 | usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME); |
1117 | } | |
1118 | ||
1119 | end_free: | |
1120 | free(metadata_str); | |
1121 | end: | |
1122 | return ret_code; | |
1123 | } | |
1124 | ||
4cbc1a04 DG |
1125 | /* |
1126 | * Receive command from session daemon and process it. | |
1127 | * | |
1128 | * Return 1 on success else a negative value or 0. | |
1129 | */ | |
3bd1e081 MD |
1130 | int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
1131 | int sock, struct pollfd *consumer_sockpoll) | |
1132 | { | |
1133 | ssize_t ret; | |
0c759fc9 | 1134 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 | 1135 | struct lttcomm_consumer_msg msg; |
ffe60014 | 1136 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 | 1137 | |
9ce5646a MD |
1138 | health_code_update(); |
1139 | ||
3bd1e081 MD |
1140 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
1141 | if (ret != sizeof(msg)) { | |
173af62f DG |
1142 | DBG("Consumer received unexpected message size %zd (expects %zu)", |
1143 | ret, sizeof(msg)); | |
3be74084 DG |
1144 | /* |
1145 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
1146 | * since the caller handles this. | |
1147 | */ | |
489f70e9 | 1148 | if (ret > 0) { |
c6857fcf | 1149 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
489f70e9 MD |
1150 | ret = -1; |
1151 | } | |
3bd1e081 MD |
1152 | return ret; |
1153 | } | |
9ce5646a MD |
1154 | |
1155 | health_code_update(); | |
1156 | ||
3bd1e081 | 1157 | if (msg.cmd_type == LTTNG_CONSUMER_STOP) { |
f50f23d9 DG |
1158 | /* |
1159 | * Notify the session daemon that the command is completed. | |
1160 | * | |
1161 | * On transport layer error, the function call will print an error | |
1162 | * message so handling the returned code is a bit useless since we | |
1163 | * return an error code anyway. | |
1164 | */ | |
1165 | (void) consumer_send_status_msg(sock, ret_code); | |
3bd1e081 MD |
1166 | return -ENOENT; |
1167 | } | |
1168 | ||
9ce5646a MD |
1169 | health_code_update(); |
1170 | ||
3f8e211f | 1171 | /* relayd needs RCU read-side lock */ |
b0b335c8 MD |
1172 | rcu_read_lock(); |
1173 | ||
3bd1e081 | 1174 | switch (msg.cmd_type) { |
00e2e675 DG |
1175 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
1176 | { | |
f50f23d9 | 1177 | /* Session daemon status message are handled in the following call. */ |
7735ef9e DG |
1178 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
1179 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, | |
d3e2ba59 JD |
1180 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
1181 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
1182 | goto end_nosignal; |
1183 | } | |
173af62f DG |
1184 | case LTTNG_CONSUMER_DESTROY_RELAYD: |
1185 | { | |
a6ba4fe1 | 1186 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
173af62f DG |
1187 | struct consumer_relayd_sock_pair *relayd; |
1188 | ||
a6ba4fe1 | 1189 | DBG("UST consumer destroying relayd %" PRIu64, index); |
173af62f DG |
1190 | |
1191 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 1192 | relayd = consumer_find_relayd(index); |
173af62f | 1193 | if (relayd == NULL) { |
3448e266 | 1194 | DBG("Unable to find relayd %" PRIu64, index); |
f50f23d9 | 1195 | ret_code = LTTNG_ERR_NO_CONSUMER; |
173af62f DG |
1196 | } |
1197 | ||
a6ba4fe1 DG |
1198 | /* |
1199 | * Each relayd socket pair has a refcount of stream attached to it | |
1200 | * which tells if the relayd is still active or not depending on the | |
1201 | * refcount value. | |
1202 | * | |
1203 | * This will set the destroy flag of the relayd object and destroy it | |
1204 | * if the refcount reaches zero when called. | |
1205 | * | |
1206 | * The destroy can happen either here or when a stream fd hangs up. | |
1207 | */ | |
f50f23d9 DG |
1208 | if (relayd) { |
1209 | consumer_flag_relayd_for_destroy(relayd); | |
1210 | } | |
1211 | ||
d88aee68 | 1212 | goto end_msg_sessiond; |
173af62f | 1213 | } |
3bd1e081 MD |
1214 | case LTTNG_CONSUMER_UPDATE_STREAM: |
1215 | { | |
3f8e211f | 1216 | rcu_read_unlock(); |
7ad0a0cb | 1217 | return -ENOSYS; |
3bd1e081 | 1218 | } |
6d805429 | 1219 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 1220 | { |
3be74084 | 1221 | int ret, is_data_pending; |
6d805429 | 1222 | uint64_t id = msg.u.data_pending.session_id; |
ca22feea | 1223 | |
6d805429 | 1224 | DBG("UST consumer data pending command for id %" PRIu64, id); |
ca22feea | 1225 | |
3be74084 | 1226 | is_data_pending = consumer_data_pending(id); |
ca22feea DG |
1227 | |
1228 | /* Send back returned value to session daemon */ | |
3be74084 DG |
1229 | ret = lttcomm_send_unix_sock(sock, &is_data_pending, |
1230 | sizeof(is_data_pending)); | |
ca22feea | 1231 | if (ret < 0) { |
3be74084 | 1232 | DBG("Error when sending the data pending ret code: %d", ret); |
489f70e9 | 1233 | goto error_fatal; |
ca22feea | 1234 | } |
f50f23d9 DG |
1235 | |
1236 | /* | |
1237 | * No need to send back a status message since the data pending | |
1238 | * returned value is the response. | |
1239 | */ | |
ca22feea | 1240 | break; |
53632229 | 1241 | } |
ffe60014 DG |
1242 | case LTTNG_CONSUMER_ASK_CHANNEL_CREATION: |
1243 | { | |
1244 | int ret; | |
1245 | struct ustctl_consumer_channel_attr attr; | |
1246 | ||
1247 | /* Create a plain object and reserve a channel key. */ | |
1248 | channel = allocate_channel(msg.u.ask_channel.session_id, | |
1249 | msg.u.ask_channel.pathname, msg.u.ask_channel.name, | |
1250 | msg.u.ask_channel.uid, msg.u.ask_channel.gid, | |
1251 | msg.u.ask_channel.relayd_id, msg.u.ask_channel.key, | |
1624d5b7 JD |
1252 | (enum lttng_event_output) msg.u.ask_channel.output, |
1253 | msg.u.ask_channel.tracefile_size, | |
2bba9e53 | 1254 | msg.u.ask_channel.tracefile_count, |
1950109e | 1255 | msg.u.ask_channel.session_id_per_pid, |
ecc48a90 JD |
1256 | msg.u.ask_channel.monitor, |
1257 | msg.u.ask_channel.live_timer_interval); | |
ffe60014 DG |
1258 | if (!channel) { |
1259 | goto end_channel_error; | |
1260 | } | |
1261 | ||
567eb353 DG |
1262 | /* |
1263 | * Assign UST application UID to the channel. This value is ignored for | |
1264 | * per PID buffers. This is specific to UST thus setting this after the | |
1265 | * allocation. | |
1266 | */ | |
1267 | channel->ust_app_uid = msg.u.ask_channel.ust_app_uid; | |
1268 | ||
ffe60014 DG |
1269 | /* Build channel attributes from received message. */ |
1270 | attr.subbuf_size = msg.u.ask_channel.subbuf_size; | |
1271 | attr.num_subbuf = msg.u.ask_channel.num_subbuf; | |
1272 | attr.overwrite = msg.u.ask_channel.overwrite; | |
1273 | attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval; | |
1274 | attr.read_timer_interval = msg.u.ask_channel.read_timer_interval; | |
7972aab2 | 1275 | attr.chan_id = msg.u.ask_channel.chan_id; |
ffe60014 DG |
1276 | memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid)); |
1277 | ||
0c759fc9 DG |
1278 | /* Match channel buffer type to the UST abi. */ |
1279 | switch (msg.u.ask_channel.output) { | |
1280 | case LTTNG_EVENT_MMAP: | |
1281 | default: | |
1282 | attr.output = LTTNG_UST_MMAP; | |
1283 | break; | |
1284 | } | |
1285 | ||
ffe60014 DG |
1286 | /* Translate and save channel type. */ |
1287 | switch (msg.u.ask_channel.type) { | |
1288 | case LTTNG_UST_CHAN_PER_CPU: | |
1289 | channel->type = CONSUMER_CHANNEL_TYPE_DATA; | |
1290 | attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8633d6e3 MD |
1291 | /* |
1292 | * Set refcount to 1 for owner. Below, we will | |
1293 | * pass ownership to the | |
1294 | * consumer_thread_channel_poll() thread. | |
1295 | */ | |
1296 | channel->refcount = 1; | |
ffe60014 DG |
1297 | break; |
1298 | case LTTNG_UST_CHAN_METADATA: | |
1299 | channel->type = CONSUMER_CHANNEL_TYPE_METADATA; | |
1300 | attr.type = LTTNG_UST_CHAN_METADATA; | |
1301 | break; | |
1302 | default: | |
1303 | assert(0); | |
1304 | goto error_fatal; | |
1305 | }; | |
1306 | ||
9ce5646a MD |
1307 | health_code_update(); |
1308 | ||
ffe60014 DG |
1309 | ret = ask_channel(ctx, sock, channel, &attr); |
1310 | if (ret < 0) { | |
1311 | goto end_channel_error; | |
1312 | } | |
1313 | ||
fc643247 MD |
1314 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1315 | ret = consumer_metadata_cache_allocate(channel); | |
1316 | if (ret < 0) { | |
1317 | ERR("Allocating metadata cache"); | |
1318 | goto end_channel_error; | |
1319 | } | |
1320 | consumer_timer_switch_start(channel, attr.switch_timer_interval); | |
1321 | attr.switch_timer_interval = 0; | |
94d49140 JD |
1322 | } else { |
1323 | consumer_timer_live_start(channel, | |
1324 | msg.u.ask_channel.live_timer_interval); | |
fc643247 MD |
1325 | } |
1326 | ||
9ce5646a MD |
1327 | health_code_update(); |
1328 | ||
ffe60014 DG |
1329 | /* |
1330 | * Add the channel to the internal state AFTER all streams were created | |
1331 | * and successfully sent to session daemon. This way, all streams must | |
1332 | * be ready before this channel is visible to the threads. | |
fc643247 MD |
1333 | * If add_channel succeeds, ownership of the channel is |
1334 | * passed to consumer_thread_channel_poll(). | |
ffe60014 DG |
1335 | */ |
1336 | ret = add_channel(channel, ctx); | |
1337 | if (ret < 0) { | |
ea88ca2a MD |
1338 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1339 | if (channel->switch_timer_enabled == 1) { | |
1340 | consumer_timer_switch_stop(channel); | |
1341 | } | |
1342 | consumer_metadata_cache_destroy(channel); | |
1343 | } | |
d3e2ba59 JD |
1344 | if (channel->live_timer_enabled == 1) { |
1345 | consumer_timer_live_stop(channel); | |
1346 | } | |
ffe60014 DG |
1347 | goto end_channel_error; |
1348 | } | |
1349 | ||
9ce5646a MD |
1350 | health_code_update(); |
1351 | ||
ffe60014 DG |
1352 | /* |
1353 | * Channel and streams are now created. Inform the session daemon that | |
1354 | * everything went well and should wait to receive the channel and | |
1355 | * streams with ustctl API. | |
1356 | */ | |
1357 | ret = consumer_send_status_channel(sock, channel); | |
1358 | if (ret < 0) { | |
1359 | /* | |
489f70e9 | 1360 | * There is probably a problem on the socket. |
ffe60014 | 1361 | */ |
489f70e9 | 1362 | goto error_fatal; |
ffe60014 DG |
1363 | } |
1364 | ||
1365 | break; | |
1366 | } | |
1367 | case LTTNG_CONSUMER_GET_CHANNEL: | |
1368 | { | |
1369 | int ret, relayd_err = 0; | |
d88aee68 | 1370 | uint64_t key = msg.u.get_channel.key; |
ffe60014 | 1371 | struct lttng_consumer_channel *channel; |
ffe60014 DG |
1372 | |
1373 | channel = consumer_find_channel(key); | |
1374 | if (!channel) { | |
8fd623e0 | 1375 | ERR("UST consumer get channel key %" PRIu64 " not found", key); |
ffe60014 DG |
1376 | ret_code = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
1377 | goto end_msg_sessiond; | |
1378 | } | |
1379 | ||
9ce5646a MD |
1380 | health_code_update(); |
1381 | ||
ffe60014 DG |
1382 | /* Send everything to sessiond. */ |
1383 | ret = send_sessiond_channel(sock, channel, ctx, &relayd_err); | |
1384 | if (ret < 0) { | |
1385 | if (relayd_err) { | |
1386 | /* | |
1387 | * We were unable to send to the relayd the stream so avoid | |
1388 | * sending back a fatal error to the thread since this is OK | |
f2a444f1 DG |
1389 | * and the consumer can continue its work. The above call |
1390 | * has sent the error status message to the sessiond. | |
ffe60014 | 1391 | */ |
f2a444f1 | 1392 | goto end_nosignal; |
ffe60014 DG |
1393 | } |
1394 | /* | |
1395 | * The communicaton was broken hence there is a bad state between | |
1396 | * the consumer and sessiond so stop everything. | |
1397 | */ | |
1398 | goto error_fatal; | |
1399 | } | |
1400 | ||
9ce5646a MD |
1401 | health_code_update(); |
1402 | ||
10a50311 JD |
1403 | /* |
1404 | * In no monitor mode, the streams ownership is kept inside the channel | |
1405 | * so don't send them to the data thread. | |
1406 | */ | |
1407 | if (!channel->monitor) { | |
1408 | goto end_msg_sessiond; | |
1409 | } | |
1410 | ||
d88aee68 DG |
1411 | ret = send_streams_to_thread(channel, ctx); |
1412 | if (ret < 0) { | |
1413 | /* | |
1414 | * If we are unable to send the stream to the thread, there is | |
1415 | * a big problem so just stop everything. | |
1416 | */ | |
1417 | goto error_fatal; | |
ffe60014 | 1418 | } |
ffe60014 DG |
1419 | /* List MUST be empty after or else it could be reused. */ |
1420 | assert(cds_list_empty(&channel->streams.head)); | |
d88aee68 DG |
1421 | goto end_msg_sessiond; |
1422 | } | |
1423 | case LTTNG_CONSUMER_DESTROY_CHANNEL: | |
1424 | { | |
1425 | uint64_t key = msg.u.destroy_channel.key; | |
d88aee68 | 1426 | |
a0cbdd2e MD |
1427 | /* |
1428 | * Only called if streams have not been sent to stream | |
1429 | * manager thread. However, channel has been sent to | |
1430 | * channel manager thread. | |
1431 | */ | |
1432 | notify_thread_del_channel(ctx, key); | |
d88aee68 | 1433 | goto end_msg_sessiond; |
ffe60014 | 1434 | } |
d88aee68 DG |
1435 | case LTTNG_CONSUMER_CLOSE_METADATA: |
1436 | { | |
1437 | int ret; | |
1438 | ||
1439 | ret = close_metadata(msg.u.close_metadata.key); | |
1440 | if (ret != 0) { | |
1441 | ret_code = ret; | |
1442 | } | |
1443 | ||
1444 | goto end_msg_sessiond; | |
1445 | } | |
7972aab2 DG |
1446 | case LTTNG_CONSUMER_FLUSH_CHANNEL: |
1447 | { | |
1448 | int ret; | |
1449 | ||
1450 | ret = flush_channel(msg.u.flush_channel.key); | |
1451 | if (ret != 0) { | |
1452 | ret_code = ret; | |
1453 | } | |
1454 | ||
1455 | goto end_msg_sessiond; | |
1456 | } | |
d88aee68 | 1457 | case LTTNG_CONSUMER_PUSH_METADATA: |
ffe60014 DG |
1458 | { |
1459 | int ret; | |
d88aee68 | 1460 | uint64_t len = msg.u.push_metadata.len; |
d88aee68 | 1461 | uint64_t key = msg.u.push_metadata.key; |
331744e3 | 1462 | uint64_t offset = msg.u.push_metadata.target_offset; |
ffe60014 DG |
1463 | struct lttng_consumer_channel *channel; |
1464 | ||
8fd623e0 DG |
1465 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, |
1466 | len); | |
ffe60014 DG |
1467 | |
1468 | channel = consumer_find_channel(key); | |
1469 | if (!channel) { | |
000baf6a DG |
1470 | /* |
1471 | * This is possible if the metadata creation on the consumer side | |
1472 | * is in flight vis-a-vis a concurrent push metadata from the | |
1473 | * session daemon. Simply return that the channel failed and the | |
1474 | * session daemon will handle that message correctly considering | |
1475 | * that this race is acceptable thus the DBG() statement here. | |
1476 | */ | |
1477 | DBG("UST consumer push metadata %" PRIu64 " not found", key); | |
1478 | ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; | |
4a2eb0ca | 1479 | goto end_msg_sessiond; |
d88aee68 DG |
1480 | } |
1481 | ||
9ce5646a MD |
1482 | health_code_update(); |
1483 | ||
d88aee68 | 1484 | /* Tell session daemon we are ready to receive the metadata. */ |
0c759fc9 | 1485 | ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS); |
ffe60014 DG |
1486 | if (ret < 0) { |
1487 | /* Somehow, the session daemon is not responding anymore. */ | |
d88aee68 DG |
1488 | goto error_fatal; |
1489 | } | |
1490 | ||
9ce5646a MD |
1491 | health_code_update(); |
1492 | ||
d88aee68 | 1493 | /* Wait for more data. */ |
9ce5646a MD |
1494 | health_poll_entry(); |
1495 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
1496 | health_poll_exit(); | |
1497 | if (ret < 0) { | |
489f70e9 | 1498 | goto error_fatal; |
d88aee68 DG |
1499 | } |
1500 | ||
9ce5646a MD |
1501 | health_code_update(); |
1502 | ||
331744e3 | 1503 | ret = lttng_ustconsumer_recv_metadata(sock, key, offset, |
94d49140 | 1504 | len, channel, 0, 1); |
d88aee68 | 1505 | if (ret < 0) { |
331744e3 | 1506 | /* error receiving from sessiond */ |
489f70e9 | 1507 | goto error_fatal; |
331744e3 JD |
1508 | } else { |
1509 | ret_code = ret; | |
d88aee68 DG |
1510 | goto end_msg_sessiond; |
1511 | } | |
d88aee68 DG |
1512 | } |
1513 | case LTTNG_CONSUMER_SETUP_METADATA: | |
1514 | { | |
1515 | int ret; | |
1516 | ||
1517 | ret = setup_metadata(ctx, msg.u.setup_metadata.key); | |
1518 | if (ret) { | |
1519 | ret_code = ret; | |
1520 | } | |
1521 | goto end_msg_sessiond; | |
ffe60014 | 1522 | } |
6dc3064a DG |
1523 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
1524 | { | |
10a50311 JD |
1525 | if (msg.u.snapshot_channel.metadata) { |
1526 | ret = snapshot_metadata(msg.u.snapshot_channel.key, | |
1527 | msg.u.snapshot_channel.pathname, | |
1528 | msg.u.snapshot_channel.relayd_id, | |
1529 | ctx); | |
1530 | if (ret < 0) { | |
1531 | ERR("Snapshot metadata failed"); | |
1532 | ret_code = LTTNG_ERR_UST_META_FAIL; | |
1533 | } | |
1534 | } else { | |
1535 | ret = snapshot_channel(msg.u.snapshot_channel.key, | |
1536 | msg.u.snapshot_channel.pathname, | |
1537 | msg.u.snapshot_channel.relayd_id, | |
5c786ded | 1538 | msg.u.snapshot_channel.max_stream_size, |
10a50311 JD |
1539 | ctx); |
1540 | if (ret < 0) { | |
1541 | ERR("Snapshot channel failed"); | |
1542 | ret_code = LTTNG_ERR_UST_CHAN_FAIL; | |
1543 | } | |
1544 | } | |
1545 | ||
9ce5646a | 1546 | health_code_update(); |
6dc3064a DG |
1547 | ret = consumer_send_status_msg(sock, ret_code); |
1548 | if (ret < 0) { | |
1549 | /* Somehow, the session daemon is not responding anymore. */ | |
1550 | goto end_nosignal; | |
1551 | } | |
9ce5646a | 1552 | health_code_update(); |
6dc3064a DG |
1553 | break; |
1554 | } | |
3bd1e081 MD |
1555 | default: |
1556 | break; | |
1557 | } | |
3f8e211f | 1558 | |
3bd1e081 | 1559 | end_nosignal: |
b0b335c8 | 1560 | rcu_read_unlock(); |
4cbc1a04 | 1561 | |
9ce5646a MD |
1562 | health_code_update(); |
1563 | ||
4cbc1a04 DG |
1564 | /* |
1565 | * Return 1 to indicate success since the 0 value can be a socket | |
1566 | * shutdown during the recv() or send() call. | |
1567 | */ | |
1568 | return 1; | |
ffe60014 DG |
1569 | |
1570 | end_msg_sessiond: | |
1571 | /* | |
1572 | * The returned value here is not useful since either way we'll return 1 to | |
1573 | * the caller because the session daemon socket management is done | |
1574 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. | |
1575 | */ | |
489f70e9 MD |
1576 | ret = consumer_send_status_msg(sock, ret_code); |
1577 | if (ret < 0) { | |
1578 | goto error_fatal; | |
1579 | } | |
ffe60014 | 1580 | rcu_read_unlock(); |
9ce5646a MD |
1581 | |
1582 | health_code_update(); | |
1583 | ||
ffe60014 DG |
1584 | return 1; |
1585 | end_channel_error: | |
1586 | if (channel) { | |
1587 | /* | |
1588 | * Free channel here since no one has a reference to it. We don't | |
1589 | * free after that because a stream can store this pointer. | |
1590 | */ | |
1591 | destroy_channel(channel); | |
1592 | } | |
1593 | /* We have to send a status channel message indicating an error. */ | |
1594 | ret = consumer_send_status_channel(sock, NULL); | |
1595 | if (ret < 0) { | |
1596 | /* Stop everything if session daemon can not be notified. */ | |
1597 | goto error_fatal; | |
1598 | } | |
1599 | rcu_read_unlock(); | |
9ce5646a MD |
1600 | |
1601 | health_code_update(); | |
1602 | ||
ffe60014 DG |
1603 | return 1; |
1604 | error_fatal: | |
1605 | rcu_read_unlock(); | |
1606 | /* This will issue a consumer stop. */ | |
1607 | return -1; | |
3bd1e081 MD |
1608 | } |
1609 | ||
ffe60014 DG |
1610 | /* |
1611 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
1612 | * compiled out, we isolate it in this library. | |
1613 | */ | |
1614 | int lttng_ustctl_get_mmap_read_offset(struct lttng_consumer_stream *stream, | |
1615 | unsigned long *off) | |
3bd1e081 | 1616 | { |
ffe60014 DG |
1617 | assert(stream); |
1618 | assert(stream->ustream); | |
b5c5fc29 | 1619 | |
ffe60014 | 1620 | return ustctl_get_mmap_read_offset(stream->ustream, off); |
3bd1e081 MD |
1621 | } |
1622 | ||
ffe60014 DG |
1623 | /* |
1624 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
1625 | * compiled out, we isolate it in this library. | |
1626 | */ | |
1627 | void *lttng_ustctl_get_mmap_base(struct lttng_consumer_stream *stream) | |
d056b477 | 1628 | { |
ffe60014 DG |
1629 | assert(stream); |
1630 | assert(stream->ustream); | |
1631 | ||
1632 | return ustctl_get_mmap_base(stream->ustream); | |
d056b477 MD |
1633 | } |
1634 | ||
ffe60014 DG |
1635 | /* |
1636 | * Take a snapshot for a specific fd | |
1637 | * | |
1638 | * Returns 0 on success, < 0 on error | |
1639 | */ | |
1640 | int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream) | |
3bd1e081 | 1641 | { |
ffe60014 DG |
1642 | assert(stream); |
1643 | assert(stream->ustream); | |
1644 | ||
1645 | return ustctl_snapshot(stream->ustream); | |
3bd1e081 MD |
1646 | } |
1647 | ||
ffe60014 DG |
1648 | /* |
1649 | * Get the produced position | |
1650 | * | |
1651 | * Returns 0 on success, < 0 on error | |
1652 | */ | |
1653 | int lttng_ustconsumer_get_produced_snapshot( | |
1654 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
3bd1e081 | 1655 | { |
ffe60014 DG |
1656 | assert(stream); |
1657 | assert(stream->ustream); | |
1658 | assert(pos); | |
7a57cf92 | 1659 | |
ffe60014 DG |
1660 | return ustctl_snapshot_get_produced(stream->ustream, pos); |
1661 | } | |
7a57cf92 | 1662 | |
10a50311 JD |
1663 | /* |
1664 | * Get the consumed position | |
1665 | * | |
1666 | * Returns 0 on success, < 0 on error | |
1667 | */ | |
1668 | int lttng_ustconsumer_get_consumed_snapshot( | |
1669 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
1670 | { | |
1671 | assert(stream); | |
1672 | assert(stream->ustream); | |
1673 | assert(pos); | |
1674 | ||
1675 | return ustctl_snapshot_get_consumed(stream->ustream, pos); | |
1676 | } | |
1677 | ||
84a182ce DG |
1678 | void lttng_ustconsumer_flush_buffer(struct lttng_consumer_stream *stream, |
1679 | int producer) | |
1680 | { | |
1681 | assert(stream); | |
1682 | assert(stream->ustream); | |
1683 | ||
1684 | ustctl_flush_buffer(stream->ustream, producer); | |
1685 | } | |
1686 | ||
1687 | int lttng_ustconsumer_get_current_timestamp( | |
1688 | struct lttng_consumer_stream *stream, uint64_t *ts) | |
1689 | { | |
1690 | assert(stream); | |
1691 | assert(stream->ustream); | |
1692 | assert(ts); | |
1693 | ||
1694 | return ustctl_get_current_timestamp(stream->ustream, ts); | |
1695 | } | |
1696 | ||
ffe60014 DG |
1697 | /* |
1698 | * Called when the stream signal the consumer that it has hang up. | |
1699 | */ | |
1700 | void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream) | |
1701 | { | |
1702 | assert(stream); | |
1703 | assert(stream->ustream); | |
2c1dd183 | 1704 | |
ffe60014 DG |
1705 | ustctl_flush_buffer(stream->ustream, 0); |
1706 | stream->hangup_flush_done = 1; | |
1707 | } | |
ee77a7b0 | 1708 | |
ffe60014 DG |
1709 | void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan) |
1710 | { | |
1711 | assert(chan); | |
1712 | assert(chan->uchan); | |
e316aad5 | 1713 | |
ea88ca2a MD |
1714 | if (chan->switch_timer_enabled == 1) { |
1715 | consumer_timer_switch_stop(chan); | |
1716 | } | |
1717 | consumer_metadata_cache_destroy(chan); | |
ffe60014 | 1718 | ustctl_destroy_channel(chan->uchan); |
3bd1e081 MD |
1719 | } |
1720 | ||
1721 | void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream) | |
1722 | { | |
ffe60014 DG |
1723 | assert(stream); |
1724 | assert(stream->ustream); | |
d41f73b7 | 1725 | |
ea88ca2a MD |
1726 | if (stream->chan->switch_timer_enabled == 1) { |
1727 | consumer_timer_switch_stop(stream->chan); | |
1728 | } | |
ffe60014 DG |
1729 | ustctl_destroy_stream(stream->ustream); |
1730 | } | |
d41f73b7 | 1731 | |
309167d2 JD |
1732 | /* |
1733 | * Populate index values of a UST stream. Values are set in big endian order. | |
1734 | * | |
1735 | * Return 0 on success or else a negative value. | |
1736 | */ | |
50adc264 | 1737 | static int get_index_values(struct ctf_packet_index *index, |
309167d2 JD |
1738 | struct ustctl_consumer_stream *ustream) |
1739 | { | |
1740 | int ret; | |
1741 | ||
1742 | ret = ustctl_get_timestamp_begin(ustream, &index->timestamp_begin); | |
1743 | if (ret < 0) { | |
1744 | PERROR("ustctl_get_timestamp_begin"); | |
1745 | goto error; | |
1746 | } | |
1747 | index->timestamp_begin = htobe64(index->timestamp_begin); | |
1748 | ||
1749 | ret = ustctl_get_timestamp_end(ustream, &index->timestamp_end); | |
1750 | if (ret < 0) { | |
1751 | PERROR("ustctl_get_timestamp_end"); | |
1752 | goto error; | |
1753 | } | |
1754 | index->timestamp_end = htobe64(index->timestamp_end); | |
1755 | ||
1756 | ret = ustctl_get_events_discarded(ustream, &index->events_discarded); | |
1757 | if (ret < 0) { | |
1758 | PERROR("ustctl_get_events_discarded"); | |
1759 | goto error; | |
1760 | } | |
1761 | index->events_discarded = htobe64(index->events_discarded); | |
1762 | ||
1763 | ret = ustctl_get_content_size(ustream, &index->content_size); | |
1764 | if (ret < 0) { | |
1765 | PERROR("ustctl_get_content_size"); | |
1766 | goto error; | |
1767 | } | |
1768 | index->content_size = htobe64(index->content_size); | |
1769 | ||
1770 | ret = ustctl_get_packet_size(ustream, &index->packet_size); | |
1771 | if (ret < 0) { | |
1772 | PERROR("ustctl_get_packet_size"); | |
1773 | goto error; | |
1774 | } | |
1775 | index->packet_size = htobe64(index->packet_size); | |
1776 | ||
1777 | ret = ustctl_get_stream_id(ustream, &index->stream_id); | |
1778 | if (ret < 0) { | |
1779 | PERROR("ustctl_get_stream_id"); | |
1780 | goto error; | |
1781 | } | |
1782 | index->stream_id = htobe64(index->stream_id); | |
1783 | ||
1784 | error: | |
1785 | return ret; | |
1786 | } | |
1787 | ||
94d49140 JD |
1788 | /* |
1789 | * Write up to one packet from the metadata cache to the channel. | |
1790 | * | |
1791 | * Returns the number of bytes pushed in the cache, or a negative value | |
1792 | * on error. | |
1793 | */ | |
1794 | static | |
1795 | int commit_one_metadata_packet(struct lttng_consumer_stream *stream) | |
1796 | { | |
1797 | ssize_t write_len; | |
1798 | int ret; | |
1799 | ||
1800 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); | |
1801 | if (stream->chan->metadata_cache->contiguous | |
1802 | == stream->ust_metadata_pushed) { | |
1803 | ret = 0; | |
1804 | goto end; | |
1805 | } | |
1806 | ||
1807 | write_len = ustctl_write_one_packet_to_channel(stream->chan->uchan, | |
1808 | &stream->chan->metadata_cache->data[stream->ust_metadata_pushed], | |
1809 | stream->chan->metadata_cache->contiguous | |
1810 | - stream->ust_metadata_pushed); | |
1811 | assert(write_len != 0); | |
1812 | if (write_len < 0) { | |
1813 | ERR("Writing one metadata packet"); | |
1814 | ret = -1; | |
1815 | goto end; | |
1816 | } | |
1817 | stream->ust_metadata_pushed += write_len; | |
1818 | ||
1819 | assert(stream->chan->metadata_cache->contiguous >= | |
1820 | stream->ust_metadata_pushed); | |
1821 | ret = write_len; | |
1822 | ||
1823 | end: | |
1824 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); | |
1825 | return ret; | |
1826 | } | |
1827 | ||
309167d2 | 1828 | |
94d49140 JD |
1829 | /* |
1830 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
1831 | * metadata thread can consumer them. | |
1832 | * | |
1833 | * Metadata stream lock MUST be acquired. | |
1834 | * | |
1835 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream | |
1836 | * is empty or a negative value on error. | |
1837 | */ | |
1838 | int lttng_ustconsumer_sync_metadata(struct lttng_consumer_local_data *ctx, | |
1839 | struct lttng_consumer_stream *metadata) | |
1840 | { | |
1841 | int ret; | |
1842 | int retry = 0; | |
1843 | ||
1844 | assert(ctx); | |
1845 | assert(metadata); | |
1846 | ||
1847 | /* | |
1848 | * Request metadata from the sessiond, but don't wait for the flush | |
1849 | * because we locked the metadata thread. | |
1850 | */ | |
1851 | ret = lttng_ustconsumer_request_metadata(ctx, metadata->chan, 0, 0); | |
1852 | if (ret < 0) { | |
1853 | goto end; | |
1854 | } | |
1855 | ||
1856 | ret = commit_one_metadata_packet(metadata); | |
1857 | if (ret <= 0) { | |
1858 | goto end; | |
1859 | } else if (ret > 0) { | |
1860 | retry = 1; | |
1861 | } | |
1862 | ||
1863 | ustctl_flush_buffer(metadata->ustream, 1); | |
1864 | ret = ustctl_snapshot(metadata->ustream); | |
1865 | if (ret < 0) { | |
1866 | if (errno != EAGAIN) { | |
1867 | ERR("Sync metadata, taking UST snapshot"); | |
1868 | goto end; | |
1869 | } | |
1870 | DBG("No new metadata when syncing them."); | |
1871 | /* No new metadata, exit. */ | |
1872 | ret = ENODATA; | |
1873 | goto end; | |
1874 | } | |
1875 | ||
1876 | /* | |
1877 | * After this flush, we still need to extract metadata. | |
1878 | */ | |
1879 | if (retry) { | |
1880 | ret = EAGAIN; | |
1881 | } | |
1882 | ||
1883 | end: | |
1884 | return ret; | |
1885 | } | |
1886 | ||
1887 | /* | |
1888 | * Read subbuffer from the given stream. | |
1889 | * | |
1890 | * Stream lock MUST be acquired. | |
1891 | * | |
1892 | * Return 0 on success else a negative value. | |
1893 | */ | |
d41f73b7 MD |
1894 | int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
1895 | struct lttng_consumer_local_data *ctx) | |
1896 | { | |
1d4dfdef | 1897 | unsigned long len, subbuf_size, padding; |
1c20f0e2 | 1898 | int err, write_index = 1; |
d41f73b7 | 1899 | long ret = 0; |
d41f73b7 | 1900 | char dummy; |
ffe60014 | 1901 | struct ustctl_consumer_stream *ustream; |
50adc264 | 1902 | struct ctf_packet_index index; |
ffe60014 DG |
1903 | |
1904 | assert(stream); | |
1905 | assert(stream->ustream); | |
1906 | assert(ctx); | |
d41f73b7 | 1907 | |
3eb914c0 | 1908 | DBG("In UST read_subbuffer (wait_fd: %d, name: %s)", stream->wait_fd, |
ffe60014 DG |
1909 | stream->name); |
1910 | ||
1911 | /* Ease our life for what's next. */ | |
1912 | ustream = stream->ustream; | |
d41f73b7 | 1913 | |
6cd525e8 MD |
1914 | /* |
1915 | * We can consume the 1 byte written into the wait_fd by UST. | |
1916 | * Don't trigger error if we cannot read this one byte (read | |
1917 | * returns 0), or if the error is EAGAIN or EWOULDBLOCK. | |
1918 | */ | |
04ef1097 | 1919 | if (stream->monitor && !stream->hangup_flush_done) { |
c617c0c6 MD |
1920 | ssize_t readlen; |
1921 | ||
6cd525e8 MD |
1922 | readlen = lttng_read(stream->wait_fd, &dummy, 1); |
1923 | if (readlen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
effcf122 MD |
1924 | ret = readlen; |
1925 | goto end; | |
1926 | } | |
d41f73b7 MD |
1927 | } |
1928 | ||
04ef1097 | 1929 | retry: |
d41f73b7 | 1930 | /* Get the next subbuffer */ |
ffe60014 | 1931 | err = ustctl_get_next_subbuf(ustream); |
d41f73b7 | 1932 | if (err != 0) { |
04ef1097 MD |
1933 | /* |
1934 | * Populate metadata info if the existing info has | |
1935 | * already been read. | |
1936 | */ | |
1937 | if (stream->metadata_flag) { | |
94d49140 JD |
1938 | ret = commit_one_metadata_packet(stream); |
1939 | if (ret <= 0) { | |
04ef1097 MD |
1940 | goto end; |
1941 | } | |
04ef1097 MD |
1942 | ustctl_flush_buffer(stream->ustream, 1); |
1943 | goto retry; | |
1944 | } | |
1945 | ||
1d4dfdef | 1946 | ret = err; /* ustctl_get_next_subbuf returns negative, caller expect positive. */ |
d41f73b7 MD |
1947 | /* |
1948 | * This is a debug message even for single-threaded consumer, | |
1949 | * because poll() have more relaxed criterions than get subbuf, | |
1950 | * so get_subbuf may fail for short race windows where poll() | |
1951 | * would issue wakeups. | |
1952 | */ | |
1953 | DBG("Reserving sub buffer failed (everything is normal, " | |
ffe60014 | 1954 | "it is due to concurrency) [ret: %d]", err); |
d41f73b7 MD |
1955 | goto end; |
1956 | } | |
ffe60014 | 1957 | assert(stream->chan->output == CONSUMER_CHANNEL_MMAP); |
309167d2 | 1958 | |
1c20f0e2 | 1959 | if (!stream->metadata_flag) { |
309167d2 JD |
1960 | index.offset = htobe64(stream->out_fd_offset); |
1961 | ret = get_index_values(&index, ustream); | |
1962 | if (ret < 0) { | |
1963 | goto end; | |
1964 | } | |
1c20f0e2 JD |
1965 | } else { |
1966 | write_index = 0; | |
309167d2 JD |
1967 | } |
1968 | ||
1d4dfdef | 1969 | /* Get the full padded subbuffer size */ |
ffe60014 | 1970 | err = ustctl_get_padded_subbuf_size(ustream, &len); |
effcf122 | 1971 | assert(err == 0); |
1d4dfdef DG |
1972 | |
1973 | /* Get subbuffer data size (without padding) */ | |
ffe60014 | 1974 | err = ustctl_get_subbuf_size(ustream, &subbuf_size); |
1d4dfdef DG |
1975 | assert(err == 0); |
1976 | ||
1977 | /* Make sure we don't get a subbuffer size bigger than the padded */ | |
1978 | assert(len >= subbuf_size); | |
1979 | ||
1980 | padding = len - subbuf_size; | |
d41f73b7 | 1981 | /* write the subbuffer to the tracefile */ |
309167d2 | 1982 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, padding, &index); |
91dfef6e DG |
1983 | /* |
1984 | * The mmap operation should write subbuf_size amount of data when network | |
1985 | * streaming or the full padding (len) size when we are _not_ streaming. | |
1986 | */ | |
d88aee68 DG |
1987 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
1988 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
d41f73b7 | 1989 | /* |
91dfef6e | 1990 | * Display the error but continue processing to try to release the |
c5c45efa DG |
1991 | * subbuffer. This is a DBG statement since any unexpected kill or |
1992 | * signal, the application gets unregistered, relayd gets closed or | |
1993 | * anything that affects the buffer lifetime will trigger this error. | |
1994 | * So, for the sake of the user, don't print this error since it can | |
1995 | * happen and it is OK with the code flow. | |
d41f73b7 | 1996 | */ |
c5c45efa | 1997 | DBG("Error writing to tracefile " |
8fd623e0 | 1998 | "(ret: %ld != len: %lu != subbuf_size: %lu)", |
91dfef6e | 1999 | ret, len, subbuf_size); |
309167d2 | 2000 | write_index = 0; |
d41f73b7 | 2001 | } |
ffe60014 | 2002 | err = ustctl_put_next_subbuf(ustream); |
effcf122 | 2003 | assert(err == 0); |
331744e3 | 2004 | |
309167d2 | 2005 | /* Write index if needed. */ |
1c20f0e2 JD |
2006 | if (!write_index) { |
2007 | goto end; | |
2008 | } | |
2009 | ||
94d49140 JD |
2010 | if (stream->chan->live_timer_interval && !stream->metadata_flag) { |
2011 | /* | |
2012 | * In live, block until all the metadata is sent. | |
2013 | */ | |
2014 | err = consumer_stream_sync_metadata(ctx, stream->session_id); | |
2015 | if (err < 0) { | |
2016 | goto end; | |
2017 | } | |
2018 | } | |
2019 | ||
1c20f0e2 JD |
2020 | assert(!stream->metadata_flag); |
2021 | err = consumer_stream_write_index(stream, &index); | |
2022 | if (err < 0) { | |
2023 | goto end; | |
309167d2 JD |
2024 | } |
2025 | ||
d41f73b7 MD |
2026 | end: |
2027 | return ret; | |
2028 | } | |
2029 | ||
ffe60014 DG |
2030 | /* |
2031 | * Called when a stream is created. | |
fe4477ee JD |
2032 | * |
2033 | * Return 0 on success or else a negative value. | |
ffe60014 | 2034 | */ |
d41f73b7 MD |
2035 | int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream) |
2036 | { | |
fe4477ee JD |
2037 | int ret; |
2038 | ||
10a50311 JD |
2039 | assert(stream); |
2040 | ||
fe4477ee | 2041 | /* Don't create anything if this is set for streaming. */ |
10a50311 | 2042 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { |
fe4477ee JD |
2043 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
2044 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
309167d2 | 2045 | stream->uid, stream->gid, NULL); |
fe4477ee JD |
2046 | if (ret < 0) { |
2047 | goto error; | |
2048 | } | |
2049 | stream->out_fd = ret; | |
2050 | stream->tracefile_size_current = 0; | |
309167d2 JD |
2051 | |
2052 | if (!stream->metadata_flag) { | |
2053 | ret = index_create_file(stream->chan->pathname, | |
2054 | stream->name, stream->uid, stream->gid, | |
2055 | stream->chan->tracefile_size, | |
2056 | stream->tracefile_count_current); | |
2057 | if (ret < 0) { | |
2058 | goto error; | |
2059 | } | |
2060 | stream->index_fd = ret; | |
2061 | } | |
fe4477ee JD |
2062 | } |
2063 | ret = 0; | |
2064 | ||
2065 | error: | |
2066 | return ret; | |
d41f73b7 | 2067 | } |
ca22feea DG |
2068 | |
2069 | /* | |
2070 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
2071 | * stream. Consumer data lock MUST be acquired before calling this function |
2072 | * and the stream lock. | |
ca22feea | 2073 | * |
6d805429 | 2074 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
2075 | * data is available for trace viewer reading. |
2076 | */ | |
6d805429 | 2077 | int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
2078 | { |
2079 | int ret; | |
2080 | ||
2081 | assert(stream); | |
ffe60014 | 2082 | assert(stream->ustream); |
ca22feea | 2083 | |
6d805429 | 2084 | DBG("UST consumer checking data pending"); |
c8f59ee5 | 2085 | |
ca6b395f MD |
2086 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
2087 | ret = 0; | |
2088 | goto end; | |
2089 | } | |
2090 | ||
04ef1097 | 2091 | if (stream->chan->type == CONSUMER_CHANNEL_TYPE_METADATA) { |
e6ee4eab DG |
2092 | uint64_t contiguous, pushed; |
2093 | ||
2094 | /* Ease our life a bit. */ | |
2095 | contiguous = stream->chan->metadata_cache->contiguous; | |
2096 | pushed = stream->ust_metadata_pushed; | |
2097 | ||
04ef1097 MD |
2098 | /* |
2099 | * We can simply check whether all contiguously available data | |
2100 | * has been pushed to the ring buffer, since the push operation | |
2101 | * is performed within get_next_subbuf(), and because both | |
2102 | * get_next_subbuf() and put_next_subbuf() are issued atomically | |
2103 | * thanks to the stream lock within | |
2104 | * lttng_ustconsumer_read_subbuffer(). This basically means that | |
2105 | * whetnever ust_metadata_pushed is incremented, the associated | |
2106 | * metadata has been consumed from the metadata stream. | |
2107 | */ | |
2108 | DBG("UST consumer metadata pending check: contiguous %" PRIu64 " vs pushed %" PRIu64, | |
e6ee4eab | 2109 | contiguous, pushed); |
6acdf328 | 2110 | assert(((int64_t) contiguous - pushed) >= 0); |
e6ee4eab | 2111 | if ((contiguous != pushed) || |
6acdf328 | 2112 | (((int64_t) contiguous - pushed) > 0 || contiguous == 0)) { |
04ef1097 MD |
2113 | ret = 1; /* Data is pending */ |
2114 | goto end; | |
2115 | } | |
2116 | } else { | |
2117 | ret = ustctl_get_next_subbuf(stream->ustream); | |
2118 | if (ret == 0) { | |
2119 | /* | |
2120 | * There is still data so let's put back this | |
2121 | * subbuffer. | |
2122 | */ | |
2123 | ret = ustctl_put_subbuf(stream->ustream); | |
2124 | assert(ret == 0); | |
2125 | ret = 1; /* Data is pending */ | |
2126 | goto end; | |
2127 | } | |
ca22feea DG |
2128 | } |
2129 | ||
6d805429 DG |
2130 | /* Data is NOT pending so ready to be read. */ |
2131 | ret = 0; | |
ca22feea | 2132 | |
6efae65e DG |
2133 | end: |
2134 | return ret; | |
ca22feea | 2135 | } |
d88aee68 DG |
2136 | |
2137 | /* | |
2138 | * Close every metadata stream wait fd of the metadata hash table. This | |
2139 | * function MUST be used very carefully so not to run into a race between the | |
2140 | * metadata thread handling streams and this function closing their wait fd. | |
2141 | * | |
2142 | * For UST, this is used when the session daemon hangs up. Its the metadata | |
2143 | * producer so calling this is safe because we are assured that no state change | |
2144 | * can occur in the metadata thread for the streams in the hash table. | |
2145 | */ | |
2146 | void lttng_ustconsumer_close_metadata(struct lttng_ht *metadata_ht) | |
2147 | { | |
d88aee68 DG |
2148 | struct lttng_ht_iter iter; |
2149 | struct lttng_consumer_stream *stream; | |
2150 | ||
2151 | assert(metadata_ht); | |
2152 | assert(metadata_ht->ht); | |
2153 | ||
2154 | DBG("UST consumer closing all metadata streams"); | |
2155 | ||
2156 | rcu_read_lock(); | |
2157 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, | |
2158 | node.node) { | |
9ce5646a MD |
2159 | |
2160 | health_code_update(); | |
2161 | ||
be2b50c7 | 2162 | pthread_mutex_lock(&stream->chan->lock); |
d88aee68 | 2163 | /* |
be2b50c7 DG |
2164 | * Whatever returned value, we must continue to try to close everything |
2165 | * so ignore it. | |
d88aee68 | 2166 | */ |
be2b50c7 DG |
2167 | (void) _close_metadata(stream->chan); |
2168 | DBG("Metadata wait fd %d and poll pipe fd %d closed", stream->wait_fd, | |
2169 | stream->ust_metadata_poll_pipe[1]); | |
2170 | pthread_mutex_unlock(&stream->chan->lock); | |
2171 | ||
d88aee68 DG |
2172 | } |
2173 | rcu_read_unlock(); | |
2174 | } | |
d8ef542d MD |
2175 | |
2176 | void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream) | |
2177 | { | |
2178 | int ret; | |
2179 | ||
2180 | ret = ustctl_stream_close_wakeup_fd(stream->ustream); | |
2181 | if (ret < 0) { | |
2182 | ERR("Unable to close wakeup fd"); | |
2183 | } | |
2184 | } | |
331744e3 | 2185 | |
f666ae70 MD |
2186 | /* |
2187 | * Please refer to consumer-timer.c before adding any lock within this | |
2188 | * function or any of its callees. Timers have a very strict locking | |
2189 | * semantic with respect to teardown. Failure to respect this semantic | |
2190 | * introduces deadlocks. | |
2191 | */ | |
331744e3 | 2192 | int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx, |
94d49140 | 2193 | struct lttng_consumer_channel *channel, int timer, int wait) |
331744e3 JD |
2194 | { |
2195 | struct lttcomm_metadata_request_msg request; | |
2196 | struct lttcomm_consumer_msg msg; | |
0c759fc9 | 2197 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
331744e3 JD |
2198 | uint64_t len, key, offset; |
2199 | int ret; | |
2200 | ||
2201 | assert(channel); | |
2202 | assert(channel->metadata_cache); | |
2203 | ||
2204 | /* send the metadata request to sessiond */ | |
2205 | switch (consumer_data.type) { | |
2206 | case LTTNG_CONSUMER64_UST: | |
2207 | request.bits_per_long = 64; | |
2208 | break; | |
2209 | case LTTNG_CONSUMER32_UST: | |
2210 | request.bits_per_long = 32; | |
2211 | break; | |
2212 | default: | |
2213 | request.bits_per_long = 0; | |
2214 | break; | |
2215 | } | |
2216 | ||
2217 | request.session_id = channel->session_id; | |
1950109e | 2218 | request.session_id_per_pid = channel->session_id_per_pid; |
567eb353 DG |
2219 | /* |
2220 | * Request the application UID here so the metadata of that application can | |
2221 | * be sent back. The channel UID corresponds to the user UID of the session | |
2222 | * used for the rights on the stream file(s). | |
2223 | */ | |
2224 | request.uid = channel->ust_app_uid; | |
331744e3 | 2225 | request.key = channel->key; |
567eb353 | 2226 | |
1950109e | 2227 | DBG("Sending metadata request to sessiond, session id %" PRIu64 |
567eb353 DG |
2228 | ", per-pid %" PRIu64 ", app UID %u and channek key %" PRIu64, |
2229 | request.session_id, request.session_id_per_pid, request.uid, | |
2230 | request.key); | |
331744e3 | 2231 | |
75d83e50 | 2232 | pthread_mutex_lock(&ctx->metadata_socket_lock); |
9ce5646a MD |
2233 | |
2234 | health_code_update(); | |
2235 | ||
331744e3 JD |
2236 | ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request, |
2237 | sizeof(request)); | |
2238 | if (ret < 0) { | |
2239 | ERR("Asking metadata to sessiond"); | |
2240 | goto end; | |
2241 | } | |
2242 | ||
9ce5646a MD |
2243 | health_code_update(); |
2244 | ||
331744e3 JD |
2245 | /* Receive the metadata from sessiond */ |
2246 | ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg, | |
2247 | sizeof(msg)); | |
2248 | if (ret != sizeof(msg)) { | |
8fd623e0 | 2249 | DBG("Consumer received unexpected message size %d (expects %zu)", |
331744e3 JD |
2250 | ret, sizeof(msg)); |
2251 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); | |
2252 | /* | |
2253 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
2254 | * since the caller handles this. | |
2255 | */ | |
2256 | goto end; | |
2257 | } | |
2258 | ||
9ce5646a MD |
2259 | health_code_update(); |
2260 | ||
331744e3 JD |
2261 | if (msg.cmd_type == LTTNG_ERR_UND) { |
2262 | /* No registry found */ | |
2263 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, | |
2264 | ret_code); | |
2265 | ret = 0; | |
2266 | goto end; | |
2267 | } else if (msg.cmd_type != LTTNG_CONSUMER_PUSH_METADATA) { | |
2268 | ERR("Unexpected cmd_type received %d", msg.cmd_type); | |
2269 | ret = -1; | |
2270 | goto end; | |
2271 | } | |
2272 | ||
2273 | len = msg.u.push_metadata.len; | |
2274 | key = msg.u.push_metadata.key; | |
2275 | offset = msg.u.push_metadata.target_offset; | |
2276 | ||
2277 | assert(key == channel->key); | |
2278 | if (len == 0) { | |
2279 | DBG("No new metadata to receive for key %" PRIu64, key); | |
2280 | } | |
2281 | ||
9ce5646a MD |
2282 | health_code_update(); |
2283 | ||
331744e3 JD |
2284 | /* Tell session daemon we are ready to receive the metadata. */ |
2285 | ret = consumer_send_status_msg(ctx->consumer_metadata_socket, | |
0c759fc9 | 2286 | LTTCOMM_CONSUMERD_SUCCESS); |
331744e3 JD |
2287 | if (ret < 0 || len == 0) { |
2288 | /* | |
2289 | * Somehow, the session daemon is not responding anymore or there is | |
2290 | * nothing to receive. | |
2291 | */ | |
2292 | goto end; | |
2293 | } | |
2294 | ||
9ce5646a MD |
2295 | health_code_update(); |
2296 | ||
1eb682be | 2297 | ret = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket, |
94d49140 | 2298 | key, offset, len, channel, timer, wait); |
1eb682be | 2299 | if (ret >= 0) { |
f2a444f1 DG |
2300 | /* |
2301 | * Only send the status msg if the sessiond is alive meaning a positive | |
2302 | * ret code. | |
2303 | */ | |
1eb682be | 2304 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret); |
f2a444f1 | 2305 | } |
331744e3 JD |
2306 | ret = 0; |
2307 | ||
2308 | end: | |
9ce5646a MD |
2309 | health_code_update(); |
2310 | ||
75d83e50 | 2311 | pthread_mutex_unlock(&ctx->metadata_socket_lock); |
331744e3 JD |
2312 | return ret; |
2313 | } |