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 | |
6c1c0768 | 20 | #define _LGPL_SOURCE |
3bd1e081 | 21 | #include <assert.h> |
f02e1e8a | 22 | #include <lttng/ust-ctl.h> |
3bd1e081 MD |
23 | #include <poll.h> |
24 | #include <pthread.h> | |
25 | #include <stdlib.h> | |
26 | #include <string.h> | |
27 | #include <sys/mman.h> | |
28 | #include <sys/socket.h> | |
dbb5dfe6 | 29 | #include <sys/stat.h> |
3bd1e081 | 30 | #include <sys/types.h> |
77c7c900 | 31 | #include <inttypes.h> |
3bd1e081 | 32 | #include <unistd.h> |
ffe60014 | 33 | #include <urcu/list.h> |
331744e3 | 34 | #include <signal.h> |
0857097f | 35 | |
51a9e1c7 | 36 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 37 | #include <common/common.h> |
10a8a223 | 38 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 39 | #include <common/relayd/relayd.h> |
dbb5dfe6 | 40 | #include <common/compat/fcntl.h> |
f263b7fd | 41 | #include <common/compat/endian.h> |
331744e3 | 42 | #include <common/consumer-metadata-cache.h> |
10a50311 | 43 | #include <common/consumer-stream.h> |
331744e3 | 44 | #include <common/consumer-timer.h> |
fe4477ee | 45 | #include <common/utils.h> |
309167d2 | 46 | #include <common/index/index.h> |
10a8a223 DG |
47 | |
48 | #include "ust-consumer.h" | |
3bd1e081 MD |
49 | |
50 | extern struct lttng_consumer_global_data consumer_data; | |
51 | extern int consumer_poll_timeout; | |
52 | extern volatile int consumer_quit; | |
53 | ||
54 | /* | |
ffe60014 DG |
55 | * Free channel object and all streams associated with it. This MUST be used |
56 | * only and only if the channel has _NEVER_ been added to the global channel | |
57 | * hash table. | |
3bd1e081 | 58 | */ |
ffe60014 | 59 | static void destroy_channel(struct lttng_consumer_channel *channel) |
3bd1e081 | 60 | { |
ffe60014 DG |
61 | struct lttng_consumer_stream *stream, *stmp; |
62 | ||
63 | assert(channel); | |
64 | ||
65 | DBG("UST consumer cleaning stream list"); | |
66 | ||
67 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
68 | send_node) { | |
9ce5646a MD |
69 | |
70 | health_code_update(); | |
71 | ||
ffe60014 DG |
72 | cds_list_del(&stream->send_node); |
73 | ustctl_destroy_stream(stream->ustream); | |
74 | free(stream); | |
75 | } | |
76 | ||
77 | /* | |
78 | * If a channel is available meaning that was created before the streams | |
79 | * were, delete it. | |
80 | */ | |
81 | if (channel->uchan) { | |
82 | lttng_ustconsumer_del_channel(channel); | |
83 | } | |
84 | free(channel); | |
85 | } | |
3bd1e081 MD |
86 | |
87 | /* | |
ffe60014 | 88 | * Add channel to internal consumer state. |
3bd1e081 | 89 | * |
ffe60014 | 90 | * Returns 0 on success or else a negative value. |
3bd1e081 | 91 | */ |
ffe60014 DG |
92 | static int add_channel(struct lttng_consumer_channel *channel, |
93 | struct lttng_consumer_local_data *ctx) | |
3bd1e081 MD |
94 | { |
95 | int ret = 0; | |
96 | ||
ffe60014 DG |
97 | assert(channel); |
98 | assert(ctx); | |
99 | ||
100 | if (ctx->on_recv_channel != NULL) { | |
101 | ret = ctx->on_recv_channel(channel); | |
102 | if (ret == 0) { | |
d8ef542d | 103 | ret = consumer_add_channel(channel, ctx); |
ffe60014 DG |
104 | } else if (ret < 0) { |
105 | /* Most likely an ENOMEM. */ | |
106 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
107 | goto error; | |
108 | } | |
109 | } else { | |
d8ef542d | 110 | ret = consumer_add_channel(channel, ctx); |
3bd1e081 MD |
111 | } |
112 | ||
d88aee68 | 113 | DBG("UST consumer channel added (key: %" PRIu64 ")", channel->key); |
ffe60014 DG |
114 | |
115 | error: | |
3bd1e081 MD |
116 | return ret; |
117 | } | |
118 | ||
119 | /* | |
ffe60014 DG |
120 | * Allocate and return a consumer channel object. |
121 | */ | |
122 | static struct lttng_consumer_channel *allocate_channel(uint64_t session_id, | |
123 | const char *pathname, const char *name, uid_t uid, gid_t gid, | |
da009f2c | 124 | uint64_t relayd_id, uint64_t key, enum lttng_event_output output, |
2bba9e53 | 125 | uint64_t tracefile_size, uint64_t tracefile_count, |
ecc48a90 JD |
126 | uint64_t session_id_per_pid, unsigned int monitor, |
127 | unsigned int live_timer_interval) | |
ffe60014 DG |
128 | { |
129 | assert(pathname); | |
130 | assert(name); | |
131 | ||
1950109e JD |
132 | return consumer_allocate_channel(key, session_id, pathname, name, uid, |
133 | gid, relayd_id, output, tracefile_size, | |
ecc48a90 | 134 | tracefile_count, session_id_per_pid, monitor, live_timer_interval); |
ffe60014 DG |
135 | } |
136 | ||
137 | /* | |
138 | * Allocate and return a consumer stream object. If _alloc_ret is not NULL, the | |
139 | * error value if applicable is set in it else it is kept untouched. | |
3bd1e081 | 140 | * |
ffe60014 | 141 | * Return NULL on error else the newly allocated stream object. |
3bd1e081 | 142 | */ |
ffe60014 DG |
143 | static struct lttng_consumer_stream *allocate_stream(int cpu, int key, |
144 | struct lttng_consumer_channel *channel, | |
145 | struct lttng_consumer_local_data *ctx, int *_alloc_ret) | |
146 | { | |
147 | int alloc_ret; | |
148 | struct lttng_consumer_stream *stream = NULL; | |
149 | ||
150 | assert(channel); | |
151 | assert(ctx); | |
152 | ||
153 | stream = consumer_allocate_stream(channel->key, | |
154 | key, | |
155 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
156 | channel->name, | |
157 | channel->uid, | |
158 | channel->gid, | |
159 | channel->relayd_id, | |
160 | channel->session_id, | |
161 | cpu, | |
162 | &alloc_ret, | |
4891ece8 DG |
163 | channel->type, |
164 | channel->monitor); | |
ffe60014 DG |
165 | if (stream == NULL) { |
166 | switch (alloc_ret) { | |
167 | case -ENOENT: | |
168 | /* | |
169 | * We could not find the channel. Can happen if cpu hotplug | |
170 | * happens while tearing down. | |
171 | */ | |
172 | DBG3("Could not find channel"); | |
173 | break; | |
174 | case -ENOMEM: | |
175 | case -EINVAL: | |
176 | default: | |
177 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
178 | break; | |
179 | } | |
180 | goto error; | |
181 | } | |
182 | ||
183 | stream->chan = channel; | |
184 | ||
185 | error: | |
186 | if (_alloc_ret) { | |
187 | *_alloc_ret = alloc_ret; | |
188 | } | |
189 | return stream; | |
190 | } | |
191 | ||
192 | /* | |
193 | * Send the given stream pointer to the corresponding thread. | |
194 | * | |
195 | * Returns 0 on success else a negative value. | |
196 | */ | |
197 | static int send_stream_to_thread(struct lttng_consumer_stream *stream, | |
198 | struct lttng_consumer_local_data *ctx) | |
199 | { | |
dae10966 DG |
200 | int ret; |
201 | struct lttng_pipe *stream_pipe; | |
ffe60014 DG |
202 | |
203 | /* Get the right pipe where the stream will be sent. */ | |
204 | if (stream->metadata_flag) { | |
5ab66908 MD |
205 | ret = consumer_add_metadata_stream(stream); |
206 | if (ret) { | |
207 | ERR("Consumer add metadata stream %" PRIu64 " failed.", | |
208 | stream->key); | |
209 | goto error; | |
210 | } | |
dae10966 | 211 | stream_pipe = ctx->consumer_metadata_pipe; |
ffe60014 | 212 | } else { |
5ab66908 MD |
213 | ret = consumer_add_data_stream(stream); |
214 | if (ret) { | |
215 | ERR("Consumer add stream %" PRIu64 " failed.", | |
216 | stream->key); | |
217 | goto error; | |
218 | } | |
dae10966 | 219 | stream_pipe = ctx->consumer_data_pipe; |
ffe60014 DG |
220 | } |
221 | ||
5ab66908 MD |
222 | /* |
223 | * From this point on, the stream's ownership has been moved away from | |
224 | * the channel and becomes globally visible. | |
225 | */ | |
226 | stream->globally_visible = 1; | |
227 | ||
dae10966 | 228 | ret = lttng_pipe_write(stream_pipe, &stream, sizeof(stream)); |
ffe60014 | 229 | if (ret < 0) { |
dae10966 DG |
230 | ERR("Consumer write %s stream to pipe %d", |
231 | stream->metadata_flag ? "metadata" : "data", | |
232 | lttng_pipe_get_writefd(stream_pipe)); | |
5ab66908 MD |
233 | if (stream->metadata_flag) { |
234 | consumer_del_stream_for_metadata(stream); | |
235 | } else { | |
236 | consumer_del_stream_for_data(stream); | |
237 | } | |
ffe60014 | 238 | } |
5ab66908 | 239 | error: |
ffe60014 DG |
240 | return ret; |
241 | } | |
242 | ||
d88aee68 DG |
243 | /* |
244 | * Create streams for the given channel using liblttng-ust-ctl. | |
245 | * | |
246 | * Return 0 on success else a negative value. | |
247 | */ | |
ffe60014 DG |
248 | static int create_ust_streams(struct lttng_consumer_channel *channel, |
249 | struct lttng_consumer_local_data *ctx) | |
250 | { | |
251 | int ret, cpu = 0; | |
252 | struct ustctl_consumer_stream *ustream; | |
253 | struct lttng_consumer_stream *stream; | |
254 | ||
255 | assert(channel); | |
256 | assert(ctx); | |
257 | ||
258 | /* | |
259 | * While a stream is available from ustctl. When NULL is returned, we've | |
260 | * reached the end of the possible stream for the channel. | |
261 | */ | |
262 | while ((ustream = ustctl_create_stream(channel->uchan, cpu))) { | |
263 | int wait_fd; | |
04ef1097 | 264 | int ust_metadata_pipe[2]; |
ffe60014 | 265 | |
9ce5646a MD |
266 | health_code_update(); |
267 | ||
04ef1097 MD |
268 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && channel->monitor) { |
269 | ret = utils_create_pipe_cloexec_nonblock(ust_metadata_pipe); | |
270 | if (ret < 0) { | |
271 | ERR("Create ust metadata poll pipe"); | |
272 | goto error; | |
273 | } | |
274 | wait_fd = ust_metadata_pipe[0]; | |
275 | } else { | |
276 | wait_fd = ustctl_stream_get_wait_fd(ustream); | |
277 | } | |
ffe60014 DG |
278 | |
279 | /* Allocate consumer stream object. */ | |
280 | stream = allocate_stream(cpu, wait_fd, channel, ctx, &ret); | |
281 | if (!stream) { | |
282 | goto error_alloc; | |
283 | } | |
284 | stream->ustream = ustream; | |
285 | /* | |
286 | * Store it so we can save multiple function calls afterwards since | |
287 | * this value is used heavily in the stream threads. This is UST | |
288 | * specific so this is why it's done after allocation. | |
289 | */ | |
290 | stream->wait_fd = wait_fd; | |
291 | ||
b31398bb DG |
292 | /* |
293 | * Increment channel refcount since the channel reference has now been | |
294 | * assigned in the allocation process above. | |
295 | */ | |
10a50311 JD |
296 | if (stream->chan->monitor) { |
297 | uatomic_inc(&stream->chan->refcount); | |
298 | } | |
b31398bb | 299 | |
ffe60014 DG |
300 | /* |
301 | * Order is important this is why a list is used. On error, the caller | |
302 | * should clean this list. | |
303 | */ | |
304 | cds_list_add_tail(&stream->send_node, &channel->streams.head); | |
305 | ||
306 | ret = ustctl_get_max_subbuf_size(stream->ustream, | |
307 | &stream->max_sb_size); | |
308 | if (ret < 0) { | |
309 | ERR("ustctl_get_max_subbuf_size failed for stream %s", | |
310 | stream->name); | |
311 | goto error; | |
312 | } | |
313 | ||
314 | /* Do actions once stream has been received. */ | |
315 | if (ctx->on_recv_stream) { | |
316 | ret = ctx->on_recv_stream(stream); | |
317 | if (ret < 0) { | |
318 | goto error; | |
319 | } | |
320 | } | |
321 | ||
d88aee68 | 322 | DBG("UST consumer add stream %s (key: %" PRIu64 ") with relayd id %" PRIu64, |
ffe60014 DG |
323 | stream->name, stream->key, stream->relayd_stream_id); |
324 | ||
325 | /* Set next CPU stream. */ | |
326 | channel->streams.count = ++cpu; | |
d88aee68 DG |
327 | |
328 | /* Keep stream reference when creating metadata. */ | |
329 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) { | |
330 | channel->metadata_stream = stream; | |
04ef1097 MD |
331 | stream->ust_metadata_poll_pipe[0] = ust_metadata_pipe[0]; |
332 | stream->ust_metadata_poll_pipe[1] = ust_metadata_pipe[1]; | |
d88aee68 | 333 | } |
ffe60014 DG |
334 | } |
335 | ||
336 | return 0; | |
337 | ||
338 | error: | |
339 | error_alloc: | |
340 | return ret; | |
341 | } | |
342 | ||
343 | /* | |
344 | * Create an UST channel with the given attributes and send it to the session | |
345 | * daemon using the ust ctl API. | |
346 | * | |
347 | * Return 0 on success or else a negative value. | |
348 | */ | |
349 | static int create_ust_channel(struct ustctl_consumer_channel_attr *attr, | |
350 | struct ustctl_consumer_channel **chanp) | |
351 | { | |
352 | int ret; | |
353 | struct ustctl_consumer_channel *channel; | |
354 | ||
355 | assert(attr); | |
356 | assert(chanp); | |
357 | ||
358 | DBG3("Creating channel to ustctl with attr: [overwrite: %d, " | |
359 | "subbuf_size: %" PRIu64 ", num_subbuf: %" PRIu64 ", " | |
360 | "switch_timer_interval: %u, read_timer_interval: %u, " | |
361 | "output: %d, type: %d", attr->overwrite, attr->subbuf_size, | |
362 | attr->num_subbuf, attr->switch_timer_interval, | |
363 | attr->read_timer_interval, attr->output, attr->type); | |
364 | ||
365 | channel = ustctl_create_channel(attr); | |
366 | if (!channel) { | |
367 | ret = -1; | |
368 | goto error_create; | |
369 | } | |
370 | ||
371 | *chanp = channel; | |
372 | ||
373 | return 0; | |
374 | ||
375 | error_create: | |
376 | return ret; | |
377 | } | |
378 | ||
d88aee68 DG |
379 | /* |
380 | * Send a single given stream to the session daemon using the sock. | |
381 | * | |
382 | * Return 0 on success else a negative value. | |
383 | */ | |
ffe60014 DG |
384 | static int send_sessiond_stream(int sock, struct lttng_consumer_stream *stream) |
385 | { | |
386 | int ret; | |
387 | ||
388 | assert(stream); | |
389 | assert(sock >= 0); | |
390 | ||
3eb914c0 | 391 | DBG("UST consumer sending stream %" PRIu64 " to sessiond", stream->key); |
ffe60014 DG |
392 | |
393 | /* Send stream to session daemon. */ | |
394 | ret = ustctl_send_stream_to_sessiond(sock, stream->ustream); | |
395 | if (ret < 0) { | |
396 | goto error; | |
397 | } | |
398 | ||
ffe60014 DG |
399 | error: |
400 | return ret; | |
401 | } | |
402 | ||
403 | /* | |
404 | * Send channel to sessiond. | |
405 | * | |
d88aee68 | 406 | * Return 0 on success or else a negative value. |
ffe60014 DG |
407 | */ |
408 | static int send_sessiond_channel(int sock, | |
409 | struct lttng_consumer_channel *channel, | |
410 | struct lttng_consumer_local_data *ctx, int *relayd_error) | |
411 | { | |
0c759fc9 | 412 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
ffe60014 | 413 | struct lttng_consumer_stream *stream; |
a4baae1b | 414 | uint64_t net_seq_idx = -1ULL; |
ffe60014 DG |
415 | |
416 | assert(channel); | |
417 | assert(ctx); | |
418 | assert(sock >= 0); | |
419 | ||
420 | DBG("UST consumer sending channel %s to sessiond", channel->name); | |
421 | ||
62285ea4 DG |
422 | if (channel->relayd_id != (uint64_t) -1ULL) { |
423 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
424 | |
425 | health_code_update(); | |
426 | ||
62285ea4 DG |
427 | /* Try to send the stream to the relayd if one is available. */ |
428 | ret = consumer_send_relayd_stream(stream, stream->chan->pathname); | |
429 | if (ret < 0) { | |
430 | /* | |
431 | * Flag that the relayd was the problem here probably due to a | |
432 | * communicaton error on the socket. | |
433 | */ | |
434 | if (relayd_error) { | |
435 | *relayd_error = 1; | |
436 | } | |
725d28b2 | 437 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
ffe60014 | 438 | } |
a4baae1b JD |
439 | if (net_seq_idx == -1ULL) { |
440 | net_seq_idx = stream->net_seq_idx; | |
441 | } | |
442 | } | |
f2a444f1 | 443 | } |
ffe60014 | 444 | |
f2a444f1 DG |
445 | /* Inform sessiond that we are about to send channel and streams. */ |
446 | ret = consumer_send_status_msg(sock, ret_code); | |
0c759fc9 | 447 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
448 | /* |
449 | * Either the session daemon is not responding or the relayd died so we | |
450 | * stop now. | |
451 | */ | |
452 | goto error; | |
453 | } | |
454 | ||
455 | /* Send channel to sessiond. */ | |
456 | ret = ustctl_send_channel_to_sessiond(sock, channel->uchan); | |
457 | if (ret < 0) { | |
458 | goto error; | |
459 | } | |
460 | ||
461 | ret = ustctl_channel_close_wakeup_fd(channel->uchan); | |
462 | if (ret < 0) { | |
463 | goto error; | |
464 | } | |
465 | ||
466 | /* The channel was sent successfully to the sessiond at this point. */ | |
467 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
468 | |
469 | health_code_update(); | |
470 | ||
ffe60014 DG |
471 | /* Send stream to session daemon. */ |
472 | ret = send_sessiond_stream(sock, stream); | |
473 | if (ret < 0) { | |
474 | goto error; | |
475 | } | |
476 | } | |
477 | ||
478 | /* Tell sessiond there is no more stream. */ | |
479 | ret = ustctl_send_stream_to_sessiond(sock, NULL); | |
480 | if (ret < 0) { | |
481 | goto error; | |
482 | } | |
483 | ||
484 | DBG("UST consumer NULL stream sent to sessiond"); | |
485 | ||
486 | return 0; | |
487 | ||
488 | error: | |
0c759fc9 | 489 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
490 | ret = -1; |
491 | } | |
ffe60014 DG |
492 | return ret; |
493 | } | |
494 | ||
495 | /* | |
496 | * Creates a channel and streams and add the channel it to the channel internal | |
497 | * state. The created stream must ONLY be sent once the GET_CHANNEL command is | |
498 | * received. | |
499 | * | |
500 | * Return 0 on success or else, a negative value is returned and the channel | |
501 | * MUST be destroyed by consumer_del_channel(). | |
502 | */ | |
503 | static int ask_channel(struct lttng_consumer_local_data *ctx, int sock, | |
504 | struct lttng_consumer_channel *channel, | |
505 | struct ustctl_consumer_channel_attr *attr) | |
3bd1e081 MD |
506 | { |
507 | int ret; | |
508 | ||
ffe60014 DG |
509 | assert(ctx); |
510 | assert(channel); | |
511 | assert(attr); | |
512 | ||
513 | /* | |
514 | * This value is still used by the kernel consumer since for the kernel, | |
515 | * the stream ownership is not IN the consumer so we need to have the | |
516 | * number of left stream that needs to be initialized so we can know when | |
517 | * to delete the channel (see consumer.c). | |
518 | * | |
519 | * As for the user space tracer now, the consumer creates and sends the | |
520 | * stream to the session daemon which only sends them to the application | |
521 | * once every stream of a channel is received making this value useless | |
522 | * because we they will be added to the poll thread before the application | |
523 | * receives them. This ensures that a stream can not hang up during | |
524 | * initilization of a channel. | |
525 | */ | |
526 | channel->nb_init_stream_left = 0; | |
527 | ||
528 | /* The reply msg status is handled in the following call. */ | |
529 | ret = create_ust_channel(attr, &channel->uchan); | |
530 | if (ret < 0) { | |
10a50311 | 531 | goto end; |
3bd1e081 MD |
532 | } |
533 | ||
d8ef542d MD |
534 | channel->wait_fd = ustctl_channel_get_wait_fd(channel->uchan); |
535 | ||
10a50311 JD |
536 | /* |
537 | * For the snapshots (no monitor), we create the metadata streams | |
538 | * on demand, not during the channel creation. | |
539 | */ | |
540 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && !channel->monitor) { | |
541 | ret = 0; | |
542 | goto end; | |
543 | } | |
544 | ||
ffe60014 DG |
545 | /* Open all streams for this channel. */ |
546 | ret = create_ust_streams(channel, ctx); | |
547 | if (ret < 0) { | |
10a50311 | 548 | goto end; |
ffe60014 DG |
549 | } |
550 | ||
10a50311 | 551 | end: |
3bd1e081 MD |
552 | return ret; |
553 | } | |
554 | ||
d88aee68 DG |
555 | /* |
556 | * Send all stream of a channel to the right thread handling it. | |
557 | * | |
558 | * On error, return a negative value else 0 on success. | |
559 | */ | |
560 | static int send_streams_to_thread(struct lttng_consumer_channel *channel, | |
561 | struct lttng_consumer_local_data *ctx) | |
562 | { | |
563 | int ret = 0; | |
564 | struct lttng_consumer_stream *stream, *stmp; | |
565 | ||
566 | assert(channel); | |
567 | assert(ctx); | |
568 | ||
569 | /* Send streams to the corresponding thread. */ | |
570 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
571 | send_node) { | |
9ce5646a MD |
572 | |
573 | health_code_update(); | |
574 | ||
d88aee68 DG |
575 | /* Sending the stream to the thread. */ |
576 | ret = send_stream_to_thread(stream, ctx); | |
577 | if (ret < 0) { | |
578 | /* | |
579 | * If we are unable to send the stream to the thread, there is | |
580 | * a big problem so just stop everything. | |
581 | */ | |
5ab66908 MD |
582 | /* Remove node from the channel stream list. */ |
583 | cds_list_del(&stream->send_node); | |
d88aee68 DG |
584 | goto error; |
585 | } | |
586 | ||
587 | /* Remove node from the channel stream list. */ | |
588 | cds_list_del(&stream->send_node); | |
4891ece8 | 589 | |
d88aee68 DG |
590 | } |
591 | ||
592 | error: | |
593 | return ret; | |
594 | } | |
595 | ||
7972aab2 DG |
596 | /* |
597 | * Flush channel's streams using the given key to retrieve the channel. | |
598 | * | |
599 | * Return 0 on success else an LTTng error code. | |
600 | */ | |
601 | static int flush_channel(uint64_t chan_key) | |
602 | { | |
603 | int ret = 0; | |
604 | struct lttng_consumer_channel *channel; | |
605 | struct lttng_consumer_stream *stream; | |
606 | struct lttng_ht *ht; | |
607 | struct lttng_ht_iter iter; | |
608 | ||
8fd623e0 | 609 | DBG("UST consumer flush channel key %" PRIu64, chan_key); |
7972aab2 | 610 | |
a500c257 | 611 | rcu_read_lock(); |
7972aab2 DG |
612 | channel = consumer_find_channel(chan_key); |
613 | if (!channel) { | |
8fd623e0 | 614 | ERR("UST consumer flush channel %" PRIu64 " not found", chan_key); |
7972aab2 DG |
615 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
616 | goto error; | |
617 | } | |
618 | ||
619 | ht = consumer_data.stream_per_chan_id_ht; | |
620 | ||
621 | /* For each stream of the channel id, flush it. */ | |
7972aab2 DG |
622 | cds_lfht_for_each_entry_duplicate(ht->ht, |
623 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
624 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
9ce5646a MD |
625 | |
626 | health_code_update(); | |
627 | ||
b8086166 | 628 | ustctl_flush_buffer(stream->ustream, 1); |
7972aab2 | 629 | } |
7972aab2 | 630 | error: |
a500c257 | 631 | rcu_read_unlock(); |
7972aab2 DG |
632 | return ret; |
633 | } | |
634 | ||
d88aee68 DG |
635 | /* |
636 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. | |
a500c257 | 637 | * RCU read side lock MUST be acquired before calling this function. |
d88aee68 DG |
638 | * |
639 | * Return 0 on success else an LTTng error code. | |
640 | */ | |
641 | static int close_metadata(uint64_t chan_key) | |
642 | { | |
ea88ca2a | 643 | int ret = 0; |
d88aee68 DG |
644 | struct lttng_consumer_channel *channel; |
645 | ||
8fd623e0 | 646 | DBG("UST consumer close metadata key %" PRIu64, chan_key); |
d88aee68 DG |
647 | |
648 | channel = consumer_find_channel(chan_key); | |
649 | if (!channel) { | |
84cc9aa0 DG |
650 | /* |
651 | * This is possible if the metadata thread has issue a delete because | |
652 | * the endpoint point of the stream hung up. There is no way the | |
653 | * session daemon can know about it thus use a DBG instead of an actual | |
654 | * error. | |
655 | */ | |
656 | DBG("UST consumer close metadata %" PRIu64 " not found", chan_key); | |
d88aee68 DG |
657 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
658 | goto error; | |
659 | } | |
660 | ||
ea88ca2a | 661 | pthread_mutex_lock(&consumer_data.lock); |
a9838785 | 662 | pthread_mutex_lock(&channel->lock); |
73811ecc DG |
663 | |
664 | if (cds_lfht_is_node_deleted(&channel->node.node)) { | |
665 | goto error_unlock; | |
666 | } | |
667 | ||
6d574024 | 668 | lttng_ustconsumer_close_metadata(channel); |
d88aee68 | 669 | |
ea88ca2a | 670 | error_unlock: |
a9838785 | 671 | pthread_mutex_unlock(&channel->lock); |
ea88ca2a | 672 | pthread_mutex_unlock(&consumer_data.lock); |
d88aee68 DG |
673 | error: |
674 | return ret; | |
675 | } | |
676 | ||
677 | /* | |
678 | * RCU read side lock MUST be acquired before calling this function. | |
679 | * | |
680 | * Return 0 on success else an LTTng error code. | |
681 | */ | |
682 | static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key) | |
683 | { | |
684 | int ret; | |
685 | struct lttng_consumer_channel *metadata; | |
686 | ||
8fd623e0 | 687 | DBG("UST consumer setup metadata key %" PRIu64, key); |
d88aee68 DG |
688 | |
689 | metadata = consumer_find_channel(key); | |
690 | if (!metadata) { | |
691 | ERR("UST consumer push metadata %" PRIu64 " not found", key); | |
692 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
10a50311 JD |
693 | goto end; |
694 | } | |
695 | ||
696 | /* | |
697 | * In no monitor mode, the metadata channel has no stream(s) so skip the | |
698 | * ownership transfer to the metadata thread. | |
699 | */ | |
700 | if (!metadata->monitor) { | |
701 | DBG("Metadata channel in no monitor"); | |
702 | ret = 0; | |
703 | goto end; | |
d88aee68 DG |
704 | } |
705 | ||
706 | /* | |
707 | * Send metadata stream to relayd if one available. Availability is | |
708 | * known if the stream is still in the list of the channel. | |
709 | */ | |
710 | if (cds_list_empty(&metadata->streams.head)) { | |
711 | ERR("Metadata channel key %" PRIu64 ", no stream available.", key); | |
712 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
f5a0c9cf | 713 | goto error_no_stream; |
d88aee68 DG |
714 | } |
715 | ||
716 | /* Send metadata stream to relayd if needed. */ | |
62285ea4 DG |
717 | if (metadata->metadata_stream->net_seq_idx != (uint64_t) -1ULL) { |
718 | ret = consumer_send_relayd_stream(metadata->metadata_stream, | |
719 | metadata->pathname); | |
720 | if (ret < 0) { | |
721 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
722 | goto error; | |
723 | } | |
601262d6 JD |
724 | ret = consumer_send_relayd_streams_sent( |
725 | metadata->metadata_stream->net_seq_idx); | |
726 | if (ret < 0) { | |
727 | ret = LTTCOMM_CONSUMERD_RELAYD_FAIL; | |
728 | goto error; | |
729 | } | |
d88aee68 DG |
730 | } |
731 | ||
732 | ret = send_streams_to_thread(metadata, ctx); | |
733 | if (ret < 0) { | |
734 | /* | |
735 | * If we are unable to send the stream to the thread, there is | |
736 | * a big problem so just stop everything. | |
737 | */ | |
738 | ret = LTTCOMM_CONSUMERD_FATAL; | |
739 | goto error; | |
740 | } | |
741 | /* List MUST be empty after or else it could be reused. */ | |
742 | assert(cds_list_empty(&metadata->streams.head)); | |
743 | ||
10a50311 JD |
744 | ret = 0; |
745 | goto end; | |
d88aee68 DG |
746 | |
747 | error: | |
f2a444f1 DG |
748 | /* |
749 | * Delete metadata channel on error. At this point, the metadata stream can | |
750 | * NOT be monitored by the metadata thread thus having the guarantee that | |
751 | * the stream is still in the local stream list of the channel. This call | |
752 | * will make sure to clean that list. | |
753 | */ | |
f5a0c9cf | 754 | consumer_stream_destroy(metadata->metadata_stream, NULL); |
212d67a2 DG |
755 | cds_list_del(&metadata->metadata_stream->send_node); |
756 | metadata->metadata_stream = NULL; | |
f5a0c9cf | 757 | error_no_stream: |
10a50311 JD |
758 | end: |
759 | return ret; | |
760 | } | |
761 | ||
762 | /* | |
763 | * Snapshot the whole metadata. | |
764 | * | |
765 | * Returns 0 on success, < 0 on error | |
766 | */ | |
767 | static int snapshot_metadata(uint64_t key, char *path, uint64_t relayd_id, | |
768 | struct lttng_consumer_local_data *ctx) | |
769 | { | |
770 | int ret = 0; | |
10a50311 JD |
771 | struct lttng_consumer_channel *metadata_channel; |
772 | struct lttng_consumer_stream *metadata_stream; | |
773 | ||
774 | assert(path); | |
775 | assert(ctx); | |
776 | ||
777 | DBG("UST consumer snapshot metadata with key %" PRIu64 " at path %s", | |
778 | key, path); | |
779 | ||
780 | rcu_read_lock(); | |
781 | ||
782 | metadata_channel = consumer_find_channel(key); | |
783 | if (!metadata_channel) { | |
6a00837f MD |
784 | ERR("UST snapshot metadata channel not found for key %" PRIu64, |
785 | key); | |
10a50311 JD |
786 | ret = -1; |
787 | goto error; | |
788 | } | |
789 | assert(!metadata_channel->monitor); | |
790 | ||
9ce5646a MD |
791 | health_code_update(); |
792 | ||
10a50311 JD |
793 | /* |
794 | * Ask the sessiond if we have new metadata waiting and update the | |
795 | * consumer metadata cache. | |
796 | */ | |
94d49140 | 797 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 1); |
10a50311 JD |
798 | if (ret < 0) { |
799 | goto error; | |
800 | } | |
801 | ||
9ce5646a MD |
802 | health_code_update(); |
803 | ||
10a50311 JD |
804 | /* |
805 | * The metadata stream is NOT created in no monitor mode when the channel | |
806 | * is created on a sessiond ask channel command. | |
807 | */ | |
808 | ret = create_ust_streams(metadata_channel, ctx); | |
809 | if (ret < 0) { | |
810 | goto error; | |
811 | } | |
812 | ||
813 | metadata_stream = metadata_channel->metadata_stream; | |
814 | assert(metadata_stream); | |
815 | ||
816 | if (relayd_id != (uint64_t) -1ULL) { | |
817 | metadata_stream->net_seq_idx = relayd_id; | |
818 | ret = consumer_send_relayd_stream(metadata_stream, path); | |
819 | if (ret < 0) { | |
820 | goto error_stream; | |
821 | } | |
822 | } else { | |
823 | ret = utils_create_stream_file(path, metadata_stream->name, | |
824 | metadata_stream->chan->tracefile_size, | |
825 | metadata_stream->tracefile_count_current, | |
309167d2 | 826 | metadata_stream->uid, metadata_stream->gid, NULL); |
10a50311 JD |
827 | if (ret < 0) { |
828 | goto error_stream; | |
829 | } | |
830 | metadata_stream->out_fd = ret; | |
831 | metadata_stream->tracefile_size_current = 0; | |
832 | } | |
833 | ||
04ef1097 | 834 | do { |
9ce5646a MD |
835 | health_code_update(); |
836 | ||
10a50311 JD |
837 | ret = lttng_consumer_read_subbuffer(metadata_stream, ctx); |
838 | if (ret < 0) { | |
94d49140 | 839 | goto error_stream; |
10a50311 | 840 | } |
04ef1097 | 841 | } while (ret > 0); |
10a50311 | 842 | |
10a50311 JD |
843 | error_stream: |
844 | /* | |
845 | * Clean up the stream completly because the next snapshot will use a new | |
846 | * metadata stream. | |
847 | */ | |
10a50311 | 848 | consumer_stream_destroy(metadata_stream, NULL); |
212d67a2 | 849 | cds_list_del(&metadata_stream->send_node); |
10a50311 JD |
850 | metadata_channel->metadata_stream = NULL; |
851 | ||
852 | error: | |
853 | rcu_read_unlock(); | |
854 | return ret; | |
855 | } | |
856 | ||
857 | /* | |
858 | * Take a snapshot of all the stream of a channel. | |
859 | * | |
860 | * Returns 0 on success, < 0 on error | |
861 | */ | |
862 | static int snapshot_channel(uint64_t key, char *path, uint64_t relayd_id, | |
5c786ded | 863 | uint64_t max_stream_size, struct lttng_consumer_local_data *ctx) |
10a50311 JD |
864 | { |
865 | int ret; | |
866 | unsigned use_relayd = 0; | |
867 | unsigned long consumed_pos, produced_pos; | |
868 | struct lttng_consumer_channel *channel; | |
869 | struct lttng_consumer_stream *stream; | |
870 | ||
871 | assert(path); | |
872 | assert(ctx); | |
873 | ||
874 | rcu_read_lock(); | |
875 | ||
876 | if (relayd_id != (uint64_t) -1ULL) { | |
877 | use_relayd = 1; | |
878 | } | |
879 | ||
880 | channel = consumer_find_channel(key); | |
881 | if (!channel) { | |
6a00837f | 882 | ERR("UST snapshot channel not found for key %" PRIu64, key); |
10a50311 JD |
883 | ret = -1; |
884 | goto error; | |
885 | } | |
886 | assert(!channel->monitor); | |
6a00837f | 887 | DBG("UST consumer snapshot channel %" PRIu64, key); |
10a50311 JD |
888 | |
889 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
890 | |
891 | health_code_update(); | |
892 | ||
10a50311 JD |
893 | /* Lock stream because we are about to change its state. */ |
894 | pthread_mutex_lock(&stream->lock); | |
895 | stream->net_seq_idx = relayd_id; | |
896 | ||
897 | if (use_relayd) { | |
898 | ret = consumer_send_relayd_stream(stream, path); | |
899 | if (ret < 0) { | |
900 | goto error_unlock; | |
901 | } | |
902 | } else { | |
903 | ret = utils_create_stream_file(path, stream->name, | |
904 | stream->chan->tracefile_size, | |
905 | stream->tracefile_count_current, | |
309167d2 | 906 | stream->uid, stream->gid, NULL); |
10a50311 JD |
907 | if (ret < 0) { |
908 | goto error_unlock; | |
909 | } | |
910 | stream->out_fd = ret; | |
911 | stream->tracefile_size_current = 0; | |
912 | ||
913 | DBG("UST consumer snapshot stream %s/%s (%" PRIu64 ")", path, | |
914 | stream->name, stream->key); | |
915 | } | |
a4baae1b JD |
916 | if (relayd_id != -1ULL) { |
917 | ret = consumer_send_relayd_streams_sent(relayd_id); | |
918 | if (ret < 0) { | |
919 | goto error_unlock; | |
920 | } | |
921 | } | |
10a50311 JD |
922 | |
923 | ustctl_flush_buffer(stream->ustream, 1); | |
924 | ||
925 | ret = lttng_ustconsumer_take_snapshot(stream); | |
926 | if (ret < 0) { | |
927 | ERR("Taking UST snapshot"); | |
928 | goto error_unlock; | |
929 | } | |
930 | ||
931 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); | |
932 | if (ret < 0) { | |
933 | ERR("Produced UST snapshot position"); | |
934 | goto error_unlock; | |
935 | } | |
936 | ||
937 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
938 | if (ret < 0) { | |
939 | ERR("Consumerd UST snapshot position"); | |
940 | goto error_unlock; | |
941 | } | |
942 | ||
5c786ded JD |
943 | /* |
944 | * The original value is sent back if max stream size is larger than | |
945 | * the possible size of the snapshot. Also, we asume that the session | |
946 | * daemon should never send a maximum stream size that is lower than | |
947 | * subbuffer size. | |
948 | */ | |
949 | consumed_pos = consumer_get_consumed_maxsize(consumed_pos, | |
950 | produced_pos, max_stream_size); | |
951 | ||
10a50311 JD |
952 | while (consumed_pos < produced_pos) { |
953 | ssize_t read_len; | |
954 | unsigned long len, padded_len; | |
955 | ||
9ce5646a MD |
956 | health_code_update(); |
957 | ||
10a50311 JD |
958 | DBG("UST consumer taking snapshot at pos %lu", consumed_pos); |
959 | ||
960 | ret = ustctl_get_subbuf(stream->ustream, &consumed_pos); | |
961 | if (ret < 0) { | |
962 | if (ret != -EAGAIN) { | |
963 | PERROR("ustctl_get_subbuf snapshot"); | |
964 | goto error_close_stream; | |
965 | } | |
966 | DBG("UST consumer get subbuf failed. Skipping it."); | |
967 | consumed_pos += stream->max_sb_size; | |
968 | continue; | |
969 | } | |
970 | ||
971 | ret = ustctl_get_subbuf_size(stream->ustream, &len); | |
972 | if (ret < 0) { | |
973 | ERR("Snapshot ustctl_get_subbuf_size"); | |
974 | goto error_put_subbuf; | |
975 | } | |
976 | ||
977 | ret = ustctl_get_padded_subbuf_size(stream->ustream, &padded_len); | |
978 | if (ret < 0) { | |
979 | ERR("Snapshot ustctl_get_padded_subbuf_size"); | |
980 | goto error_put_subbuf; | |
981 | } | |
982 | ||
983 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
309167d2 | 984 | padded_len - len, NULL); |
10a50311 JD |
985 | if (use_relayd) { |
986 | if (read_len != len) { | |
56591bac | 987 | ret = -EPERM; |
10a50311 JD |
988 | goto error_put_subbuf; |
989 | } | |
990 | } else { | |
991 | if (read_len != padded_len) { | |
56591bac | 992 | ret = -EPERM; |
10a50311 JD |
993 | goto error_put_subbuf; |
994 | } | |
995 | } | |
996 | ||
997 | ret = ustctl_put_subbuf(stream->ustream); | |
998 | if (ret < 0) { | |
999 | ERR("Snapshot ustctl_put_subbuf"); | |
1000 | goto error_close_stream; | |
1001 | } | |
1002 | consumed_pos += stream->max_sb_size; | |
1003 | } | |
1004 | ||
1005 | /* Simply close the stream so we can use it on the next snapshot. */ | |
1006 | consumer_stream_close(stream); | |
1007 | pthread_mutex_unlock(&stream->lock); | |
1008 | } | |
1009 | ||
1010 | rcu_read_unlock(); | |
1011 | return 0; | |
1012 | ||
1013 | error_put_subbuf: | |
1014 | if (ustctl_put_subbuf(stream->ustream) < 0) { | |
1015 | ERR("Snapshot ustctl_put_subbuf"); | |
1016 | } | |
1017 | error_close_stream: | |
1018 | consumer_stream_close(stream); | |
1019 | error_unlock: | |
1020 | pthread_mutex_unlock(&stream->lock); | |
1021 | error: | |
1022 | rcu_read_unlock(); | |
d88aee68 DG |
1023 | return ret; |
1024 | } | |
1025 | ||
331744e3 JD |
1026 | /* |
1027 | * Receive the metadata updates from the sessiond. | |
1028 | */ | |
1029 | int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset, | |
5e41ebe1 | 1030 | uint64_t len, struct lttng_consumer_channel *channel, |
94d49140 | 1031 | int timer, int wait) |
331744e3 | 1032 | { |
0c759fc9 | 1033 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
331744e3 JD |
1034 | char *metadata_str; |
1035 | ||
8fd623e0 | 1036 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len); |
331744e3 JD |
1037 | |
1038 | metadata_str = zmalloc(len * sizeof(char)); | |
1039 | if (!metadata_str) { | |
1040 | PERROR("zmalloc metadata string"); | |
1041 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; | |
1042 | goto end; | |
1043 | } | |
1044 | ||
9ce5646a MD |
1045 | health_code_update(); |
1046 | ||
331744e3 JD |
1047 | /* Receive metadata string. */ |
1048 | ret = lttcomm_recv_unix_sock(sock, metadata_str, len); | |
1049 | if (ret < 0) { | |
1050 | /* Session daemon is dead so return gracefully. */ | |
1051 | ret_code = ret; | |
1052 | goto end_free; | |
1053 | } | |
1054 | ||
9ce5646a MD |
1055 | health_code_update(); |
1056 | ||
331744e3 JD |
1057 | pthread_mutex_lock(&channel->metadata_cache->lock); |
1058 | ret = consumer_metadata_cache_write(channel, offset, len, metadata_str); | |
1059 | if (ret < 0) { | |
1060 | /* Unable to handle metadata. Notify session daemon. */ | |
1061 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
a32bd775 DG |
1062 | /* |
1063 | * Skip metadata flush on write error since the offset and len might | |
1064 | * not have been updated which could create an infinite loop below when | |
1065 | * waiting for the metadata cache to be flushed. | |
1066 | */ | |
1067 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
a32bd775 | 1068 | goto end_free; |
331744e3 JD |
1069 | } |
1070 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
1071 | ||
94d49140 JD |
1072 | if (!wait) { |
1073 | goto end_free; | |
1074 | } | |
5e41ebe1 | 1075 | while (consumer_metadata_cache_flushed(channel, offset + len, timer)) { |
331744e3 | 1076 | DBG("Waiting for metadata to be flushed"); |
9ce5646a MD |
1077 | |
1078 | health_code_update(); | |
1079 | ||
331744e3 JD |
1080 | usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME); |
1081 | } | |
1082 | ||
1083 | end_free: | |
1084 | free(metadata_str); | |
1085 | end: | |
1086 | return ret_code; | |
1087 | } | |
1088 | ||
4cbc1a04 DG |
1089 | /* |
1090 | * Receive command from session daemon and process it. | |
1091 | * | |
1092 | * Return 1 on success else a negative value or 0. | |
1093 | */ | |
3bd1e081 MD |
1094 | int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
1095 | int sock, struct pollfd *consumer_sockpoll) | |
1096 | { | |
1097 | ssize_t ret; | |
0c759fc9 | 1098 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 | 1099 | struct lttcomm_consumer_msg msg; |
ffe60014 | 1100 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 | 1101 | |
9ce5646a MD |
1102 | health_code_update(); |
1103 | ||
3bd1e081 MD |
1104 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
1105 | if (ret != sizeof(msg)) { | |
173af62f DG |
1106 | DBG("Consumer received unexpected message size %zd (expects %zu)", |
1107 | ret, sizeof(msg)); | |
3be74084 DG |
1108 | /* |
1109 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
1110 | * since the caller handles this. | |
1111 | */ | |
489f70e9 | 1112 | if (ret > 0) { |
c6857fcf | 1113 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
489f70e9 MD |
1114 | ret = -1; |
1115 | } | |
3bd1e081 MD |
1116 | return ret; |
1117 | } | |
9ce5646a MD |
1118 | |
1119 | health_code_update(); | |
1120 | ||
84382d49 MD |
1121 | /* deprecated */ |
1122 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 1123 | |
9ce5646a MD |
1124 | health_code_update(); |
1125 | ||
3f8e211f | 1126 | /* relayd needs RCU read-side lock */ |
b0b335c8 MD |
1127 | rcu_read_lock(); |
1128 | ||
3bd1e081 | 1129 | switch (msg.cmd_type) { |
00e2e675 DG |
1130 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
1131 | { | |
f50f23d9 | 1132 | /* Session daemon status message are handled in the following call. */ |
7735ef9e DG |
1133 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
1134 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, | |
d3e2ba59 JD |
1135 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
1136 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
1137 | goto end_nosignal; |
1138 | } | |
173af62f DG |
1139 | case LTTNG_CONSUMER_DESTROY_RELAYD: |
1140 | { | |
a6ba4fe1 | 1141 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
173af62f DG |
1142 | struct consumer_relayd_sock_pair *relayd; |
1143 | ||
a6ba4fe1 | 1144 | DBG("UST consumer destroying relayd %" PRIu64, index); |
173af62f DG |
1145 | |
1146 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 1147 | relayd = consumer_find_relayd(index); |
173af62f | 1148 | if (relayd == NULL) { |
3448e266 | 1149 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 1150 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
173af62f DG |
1151 | } |
1152 | ||
a6ba4fe1 DG |
1153 | /* |
1154 | * Each relayd socket pair has a refcount of stream attached to it | |
1155 | * which tells if the relayd is still active or not depending on the | |
1156 | * refcount value. | |
1157 | * | |
1158 | * This will set the destroy flag of the relayd object and destroy it | |
1159 | * if the refcount reaches zero when called. | |
1160 | * | |
1161 | * The destroy can happen either here or when a stream fd hangs up. | |
1162 | */ | |
f50f23d9 DG |
1163 | if (relayd) { |
1164 | consumer_flag_relayd_for_destroy(relayd); | |
1165 | } | |
1166 | ||
d88aee68 | 1167 | goto end_msg_sessiond; |
173af62f | 1168 | } |
3bd1e081 MD |
1169 | case LTTNG_CONSUMER_UPDATE_STREAM: |
1170 | { | |
3f8e211f | 1171 | rcu_read_unlock(); |
7ad0a0cb | 1172 | return -ENOSYS; |
3bd1e081 | 1173 | } |
6d805429 | 1174 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 1175 | { |
3be74084 | 1176 | int ret, is_data_pending; |
6d805429 | 1177 | uint64_t id = msg.u.data_pending.session_id; |
ca22feea | 1178 | |
6d805429 | 1179 | DBG("UST consumer data pending command for id %" PRIu64, id); |
ca22feea | 1180 | |
3be74084 | 1181 | is_data_pending = consumer_data_pending(id); |
ca22feea DG |
1182 | |
1183 | /* Send back returned value to session daemon */ | |
3be74084 DG |
1184 | ret = lttcomm_send_unix_sock(sock, &is_data_pending, |
1185 | sizeof(is_data_pending)); | |
ca22feea | 1186 | if (ret < 0) { |
3be74084 | 1187 | DBG("Error when sending the data pending ret code: %d", ret); |
489f70e9 | 1188 | goto error_fatal; |
ca22feea | 1189 | } |
f50f23d9 DG |
1190 | |
1191 | /* | |
1192 | * No need to send back a status message since the data pending | |
1193 | * returned value is the response. | |
1194 | */ | |
ca22feea | 1195 | break; |
53632229 | 1196 | } |
ffe60014 DG |
1197 | case LTTNG_CONSUMER_ASK_CHANNEL_CREATION: |
1198 | { | |
1199 | int ret; | |
1200 | struct ustctl_consumer_channel_attr attr; | |
1201 | ||
1202 | /* Create a plain object and reserve a channel key. */ | |
1203 | channel = allocate_channel(msg.u.ask_channel.session_id, | |
1204 | msg.u.ask_channel.pathname, msg.u.ask_channel.name, | |
1205 | msg.u.ask_channel.uid, msg.u.ask_channel.gid, | |
1206 | msg.u.ask_channel.relayd_id, msg.u.ask_channel.key, | |
1624d5b7 JD |
1207 | (enum lttng_event_output) msg.u.ask_channel.output, |
1208 | msg.u.ask_channel.tracefile_size, | |
2bba9e53 | 1209 | msg.u.ask_channel.tracefile_count, |
1950109e | 1210 | msg.u.ask_channel.session_id_per_pid, |
ecc48a90 JD |
1211 | msg.u.ask_channel.monitor, |
1212 | msg.u.ask_channel.live_timer_interval); | |
ffe60014 DG |
1213 | if (!channel) { |
1214 | goto end_channel_error; | |
1215 | } | |
1216 | ||
567eb353 DG |
1217 | /* |
1218 | * Assign UST application UID to the channel. This value is ignored for | |
1219 | * per PID buffers. This is specific to UST thus setting this after the | |
1220 | * allocation. | |
1221 | */ | |
1222 | channel->ust_app_uid = msg.u.ask_channel.ust_app_uid; | |
1223 | ||
ffe60014 DG |
1224 | /* Build channel attributes from received message. */ |
1225 | attr.subbuf_size = msg.u.ask_channel.subbuf_size; | |
1226 | attr.num_subbuf = msg.u.ask_channel.num_subbuf; | |
1227 | attr.overwrite = msg.u.ask_channel.overwrite; | |
1228 | attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval; | |
1229 | attr.read_timer_interval = msg.u.ask_channel.read_timer_interval; | |
7972aab2 | 1230 | attr.chan_id = msg.u.ask_channel.chan_id; |
ffe60014 DG |
1231 | memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid)); |
1232 | ||
0c759fc9 DG |
1233 | /* Match channel buffer type to the UST abi. */ |
1234 | switch (msg.u.ask_channel.output) { | |
1235 | case LTTNG_EVENT_MMAP: | |
1236 | default: | |
1237 | attr.output = LTTNG_UST_MMAP; | |
1238 | break; | |
1239 | } | |
1240 | ||
ffe60014 DG |
1241 | /* Translate and save channel type. */ |
1242 | switch (msg.u.ask_channel.type) { | |
1243 | case LTTNG_UST_CHAN_PER_CPU: | |
1244 | channel->type = CONSUMER_CHANNEL_TYPE_DATA; | |
1245 | attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8633d6e3 MD |
1246 | /* |
1247 | * Set refcount to 1 for owner. Below, we will | |
1248 | * pass ownership to the | |
1249 | * consumer_thread_channel_poll() thread. | |
1250 | */ | |
1251 | channel->refcount = 1; | |
ffe60014 DG |
1252 | break; |
1253 | case LTTNG_UST_CHAN_METADATA: | |
1254 | channel->type = CONSUMER_CHANNEL_TYPE_METADATA; | |
1255 | attr.type = LTTNG_UST_CHAN_METADATA; | |
1256 | break; | |
1257 | default: | |
1258 | assert(0); | |
1259 | goto error_fatal; | |
1260 | }; | |
1261 | ||
9ce5646a MD |
1262 | health_code_update(); |
1263 | ||
ffe60014 DG |
1264 | ret = ask_channel(ctx, sock, channel, &attr); |
1265 | if (ret < 0) { | |
1266 | goto end_channel_error; | |
1267 | } | |
1268 | ||
fc643247 MD |
1269 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1270 | ret = consumer_metadata_cache_allocate(channel); | |
1271 | if (ret < 0) { | |
1272 | ERR("Allocating metadata cache"); | |
1273 | goto end_channel_error; | |
1274 | } | |
1275 | consumer_timer_switch_start(channel, attr.switch_timer_interval); | |
1276 | attr.switch_timer_interval = 0; | |
94d49140 JD |
1277 | } else { |
1278 | consumer_timer_live_start(channel, | |
1279 | msg.u.ask_channel.live_timer_interval); | |
fc643247 MD |
1280 | } |
1281 | ||
9ce5646a MD |
1282 | health_code_update(); |
1283 | ||
ffe60014 DG |
1284 | /* |
1285 | * Add the channel to the internal state AFTER all streams were created | |
1286 | * and successfully sent to session daemon. This way, all streams must | |
1287 | * be ready before this channel is visible to the threads. | |
fc643247 MD |
1288 | * If add_channel succeeds, ownership of the channel is |
1289 | * passed to consumer_thread_channel_poll(). | |
ffe60014 DG |
1290 | */ |
1291 | ret = add_channel(channel, ctx); | |
1292 | if (ret < 0) { | |
ea88ca2a MD |
1293 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1294 | if (channel->switch_timer_enabled == 1) { | |
1295 | consumer_timer_switch_stop(channel); | |
1296 | } | |
1297 | consumer_metadata_cache_destroy(channel); | |
1298 | } | |
d3e2ba59 JD |
1299 | if (channel->live_timer_enabled == 1) { |
1300 | consumer_timer_live_stop(channel); | |
1301 | } | |
ffe60014 DG |
1302 | goto end_channel_error; |
1303 | } | |
1304 | ||
9ce5646a MD |
1305 | health_code_update(); |
1306 | ||
ffe60014 DG |
1307 | /* |
1308 | * Channel and streams are now created. Inform the session daemon that | |
1309 | * everything went well and should wait to receive the channel and | |
1310 | * streams with ustctl API. | |
1311 | */ | |
1312 | ret = consumer_send_status_channel(sock, channel); | |
1313 | if (ret < 0) { | |
1314 | /* | |
489f70e9 | 1315 | * There is probably a problem on the socket. |
ffe60014 | 1316 | */ |
489f70e9 | 1317 | goto error_fatal; |
ffe60014 DG |
1318 | } |
1319 | ||
1320 | break; | |
1321 | } | |
1322 | case LTTNG_CONSUMER_GET_CHANNEL: | |
1323 | { | |
1324 | int ret, relayd_err = 0; | |
d88aee68 | 1325 | uint64_t key = msg.u.get_channel.key; |
ffe60014 | 1326 | struct lttng_consumer_channel *channel; |
ffe60014 DG |
1327 | |
1328 | channel = consumer_find_channel(key); | |
1329 | if (!channel) { | |
8fd623e0 | 1330 | ERR("UST consumer get channel key %" PRIu64 " not found", key); |
e462382a | 1331 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
ffe60014 DG |
1332 | goto end_msg_sessiond; |
1333 | } | |
1334 | ||
9ce5646a MD |
1335 | health_code_update(); |
1336 | ||
ffe60014 DG |
1337 | /* Send everything to sessiond. */ |
1338 | ret = send_sessiond_channel(sock, channel, ctx, &relayd_err); | |
1339 | if (ret < 0) { | |
1340 | if (relayd_err) { | |
1341 | /* | |
1342 | * We were unable to send to the relayd the stream so avoid | |
1343 | * sending back a fatal error to the thread since this is OK | |
f2a444f1 DG |
1344 | * and the consumer can continue its work. The above call |
1345 | * has sent the error status message to the sessiond. | |
ffe60014 | 1346 | */ |
f2a444f1 | 1347 | goto end_nosignal; |
ffe60014 DG |
1348 | } |
1349 | /* | |
1350 | * The communicaton was broken hence there is a bad state between | |
1351 | * the consumer and sessiond so stop everything. | |
1352 | */ | |
1353 | goto error_fatal; | |
1354 | } | |
1355 | ||
9ce5646a MD |
1356 | health_code_update(); |
1357 | ||
10a50311 JD |
1358 | /* |
1359 | * In no monitor mode, the streams ownership is kept inside the channel | |
1360 | * so don't send them to the data thread. | |
1361 | */ | |
1362 | if (!channel->monitor) { | |
1363 | goto end_msg_sessiond; | |
1364 | } | |
1365 | ||
d88aee68 DG |
1366 | ret = send_streams_to_thread(channel, ctx); |
1367 | if (ret < 0) { | |
1368 | /* | |
1369 | * If we are unable to send the stream to the thread, there is | |
1370 | * a big problem so just stop everything. | |
1371 | */ | |
1372 | goto error_fatal; | |
ffe60014 | 1373 | } |
ffe60014 DG |
1374 | /* List MUST be empty after or else it could be reused. */ |
1375 | assert(cds_list_empty(&channel->streams.head)); | |
d88aee68 DG |
1376 | goto end_msg_sessiond; |
1377 | } | |
1378 | case LTTNG_CONSUMER_DESTROY_CHANNEL: | |
1379 | { | |
1380 | uint64_t key = msg.u.destroy_channel.key; | |
d88aee68 | 1381 | |
a0cbdd2e MD |
1382 | /* |
1383 | * Only called if streams have not been sent to stream | |
1384 | * manager thread. However, channel has been sent to | |
1385 | * channel manager thread. | |
1386 | */ | |
1387 | notify_thread_del_channel(ctx, key); | |
d88aee68 | 1388 | goto end_msg_sessiond; |
ffe60014 | 1389 | } |
d88aee68 DG |
1390 | case LTTNG_CONSUMER_CLOSE_METADATA: |
1391 | { | |
1392 | int ret; | |
1393 | ||
1394 | ret = close_metadata(msg.u.close_metadata.key); | |
1395 | if (ret != 0) { | |
1396 | ret_code = ret; | |
1397 | } | |
1398 | ||
1399 | goto end_msg_sessiond; | |
1400 | } | |
7972aab2 DG |
1401 | case LTTNG_CONSUMER_FLUSH_CHANNEL: |
1402 | { | |
1403 | int ret; | |
1404 | ||
1405 | ret = flush_channel(msg.u.flush_channel.key); | |
1406 | if (ret != 0) { | |
1407 | ret_code = ret; | |
1408 | } | |
1409 | ||
1410 | goto end_msg_sessiond; | |
1411 | } | |
d88aee68 | 1412 | case LTTNG_CONSUMER_PUSH_METADATA: |
ffe60014 DG |
1413 | { |
1414 | int ret; | |
d88aee68 | 1415 | uint64_t len = msg.u.push_metadata.len; |
d88aee68 | 1416 | uint64_t key = msg.u.push_metadata.key; |
331744e3 | 1417 | uint64_t offset = msg.u.push_metadata.target_offset; |
ffe60014 DG |
1418 | struct lttng_consumer_channel *channel; |
1419 | ||
8fd623e0 DG |
1420 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, |
1421 | len); | |
ffe60014 DG |
1422 | |
1423 | channel = consumer_find_channel(key); | |
1424 | if (!channel) { | |
000baf6a DG |
1425 | /* |
1426 | * This is possible if the metadata creation on the consumer side | |
1427 | * is in flight vis-a-vis a concurrent push metadata from the | |
1428 | * session daemon. Simply return that the channel failed and the | |
1429 | * session daemon will handle that message correctly considering | |
1430 | * that this race is acceptable thus the DBG() statement here. | |
1431 | */ | |
1432 | DBG("UST consumer push metadata %" PRIu64 " not found", key); | |
1433 | ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; | |
4a2eb0ca | 1434 | goto end_msg_sessiond; |
d88aee68 DG |
1435 | } |
1436 | ||
9ce5646a MD |
1437 | health_code_update(); |
1438 | ||
d88aee68 | 1439 | /* Tell session daemon we are ready to receive the metadata. */ |
0c759fc9 | 1440 | ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS); |
ffe60014 DG |
1441 | if (ret < 0) { |
1442 | /* Somehow, the session daemon is not responding anymore. */ | |
d88aee68 DG |
1443 | goto error_fatal; |
1444 | } | |
1445 | ||
9ce5646a MD |
1446 | health_code_update(); |
1447 | ||
d88aee68 | 1448 | /* Wait for more data. */ |
9ce5646a MD |
1449 | health_poll_entry(); |
1450 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
1451 | health_poll_exit(); | |
84382d49 | 1452 | if (ret) { |
489f70e9 | 1453 | goto error_fatal; |
d88aee68 DG |
1454 | } |
1455 | ||
9ce5646a MD |
1456 | health_code_update(); |
1457 | ||
331744e3 | 1458 | ret = lttng_ustconsumer_recv_metadata(sock, key, offset, |
94d49140 | 1459 | len, channel, 0, 1); |
d88aee68 | 1460 | if (ret < 0) { |
331744e3 | 1461 | /* error receiving from sessiond */ |
489f70e9 | 1462 | goto error_fatal; |
331744e3 JD |
1463 | } else { |
1464 | ret_code = ret; | |
d88aee68 DG |
1465 | goto end_msg_sessiond; |
1466 | } | |
d88aee68 DG |
1467 | } |
1468 | case LTTNG_CONSUMER_SETUP_METADATA: | |
1469 | { | |
1470 | int ret; | |
1471 | ||
1472 | ret = setup_metadata(ctx, msg.u.setup_metadata.key); | |
1473 | if (ret) { | |
1474 | ret_code = ret; | |
1475 | } | |
1476 | goto end_msg_sessiond; | |
ffe60014 | 1477 | } |
6dc3064a DG |
1478 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
1479 | { | |
10a50311 JD |
1480 | if (msg.u.snapshot_channel.metadata) { |
1481 | ret = snapshot_metadata(msg.u.snapshot_channel.key, | |
1482 | msg.u.snapshot_channel.pathname, | |
1483 | msg.u.snapshot_channel.relayd_id, | |
1484 | ctx); | |
1485 | if (ret < 0) { | |
1486 | ERR("Snapshot metadata failed"); | |
e462382a | 1487 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; |
10a50311 JD |
1488 | } |
1489 | } else { | |
1490 | ret = snapshot_channel(msg.u.snapshot_channel.key, | |
1491 | msg.u.snapshot_channel.pathname, | |
1492 | msg.u.snapshot_channel.relayd_id, | |
5c786ded | 1493 | msg.u.snapshot_channel.max_stream_size, |
10a50311 JD |
1494 | ctx); |
1495 | if (ret < 0) { | |
1496 | ERR("Snapshot channel failed"); | |
e462382a | 1497 | ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; |
10a50311 JD |
1498 | } |
1499 | } | |
1500 | ||
9ce5646a | 1501 | health_code_update(); |
6dc3064a DG |
1502 | ret = consumer_send_status_msg(sock, ret_code); |
1503 | if (ret < 0) { | |
1504 | /* Somehow, the session daemon is not responding anymore. */ | |
1505 | goto end_nosignal; | |
1506 | } | |
9ce5646a | 1507 | health_code_update(); |
6dc3064a DG |
1508 | break; |
1509 | } | |
3bd1e081 MD |
1510 | default: |
1511 | break; | |
1512 | } | |
3f8e211f | 1513 | |
3bd1e081 | 1514 | end_nosignal: |
b0b335c8 | 1515 | rcu_read_unlock(); |
4cbc1a04 | 1516 | |
9ce5646a MD |
1517 | health_code_update(); |
1518 | ||
4cbc1a04 DG |
1519 | /* |
1520 | * Return 1 to indicate success since the 0 value can be a socket | |
1521 | * shutdown during the recv() or send() call. | |
1522 | */ | |
1523 | return 1; | |
ffe60014 DG |
1524 | |
1525 | end_msg_sessiond: | |
1526 | /* | |
1527 | * The returned value here is not useful since either way we'll return 1 to | |
1528 | * the caller because the session daemon socket management is done | |
1529 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. | |
1530 | */ | |
489f70e9 MD |
1531 | ret = consumer_send_status_msg(sock, ret_code); |
1532 | if (ret < 0) { | |
1533 | goto error_fatal; | |
1534 | } | |
ffe60014 | 1535 | rcu_read_unlock(); |
9ce5646a MD |
1536 | |
1537 | health_code_update(); | |
1538 | ||
ffe60014 DG |
1539 | return 1; |
1540 | end_channel_error: | |
1541 | if (channel) { | |
1542 | /* | |
1543 | * Free channel here since no one has a reference to it. We don't | |
1544 | * free after that because a stream can store this pointer. | |
1545 | */ | |
1546 | destroy_channel(channel); | |
1547 | } | |
1548 | /* We have to send a status channel message indicating an error. */ | |
1549 | ret = consumer_send_status_channel(sock, NULL); | |
1550 | if (ret < 0) { | |
1551 | /* Stop everything if session daemon can not be notified. */ | |
1552 | goto error_fatal; | |
1553 | } | |
1554 | rcu_read_unlock(); | |
9ce5646a MD |
1555 | |
1556 | health_code_update(); | |
1557 | ||
ffe60014 DG |
1558 | return 1; |
1559 | error_fatal: | |
1560 | rcu_read_unlock(); | |
1561 | /* This will issue a consumer stop. */ | |
1562 | return -1; | |
3bd1e081 MD |
1563 | } |
1564 | ||
ffe60014 DG |
1565 | /* |
1566 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
1567 | * compiled out, we isolate it in this library. | |
1568 | */ | |
1569 | int lttng_ustctl_get_mmap_read_offset(struct lttng_consumer_stream *stream, | |
1570 | unsigned long *off) | |
3bd1e081 | 1571 | { |
ffe60014 DG |
1572 | assert(stream); |
1573 | assert(stream->ustream); | |
b5c5fc29 | 1574 | |
ffe60014 | 1575 | return ustctl_get_mmap_read_offset(stream->ustream, off); |
3bd1e081 MD |
1576 | } |
1577 | ||
ffe60014 DG |
1578 | /* |
1579 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
1580 | * compiled out, we isolate it in this library. | |
1581 | */ | |
1582 | void *lttng_ustctl_get_mmap_base(struct lttng_consumer_stream *stream) | |
d056b477 | 1583 | { |
ffe60014 DG |
1584 | assert(stream); |
1585 | assert(stream->ustream); | |
1586 | ||
1587 | return ustctl_get_mmap_base(stream->ustream); | |
d056b477 MD |
1588 | } |
1589 | ||
ffe60014 DG |
1590 | /* |
1591 | * Take a snapshot for a specific fd | |
1592 | * | |
1593 | * Returns 0 on success, < 0 on error | |
1594 | */ | |
1595 | int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream) | |
3bd1e081 | 1596 | { |
ffe60014 DG |
1597 | assert(stream); |
1598 | assert(stream->ustream); | |
1599 | ||
1600 | return ustctl_snapshot(stream->ustream); | |
3bd1e081 MD |
1601 | } |
1602 | ||
ffe60014 DG |
1603 | /* |
1604 | * Get the produced position | |
1605 | * | |
1606 | * Returns 0 on success, < 0 on error | |
1607 | */ | |
1608 | int lttng_ustconsumer_get_produced_snapshot( | |
1609 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
3bd1e081 | 1610 | { |
ffe60014 DG |
1611 | assert(stream); |
1612 | assert(stream->ustream); | |
1613 | assert(pos); | |
7a57cf92 | 1614 | |
ffe60014 DG |
1615 | return ustctl_snapshot_get_produced(stream->ustream, pos); |
1616 | } | |
7a57cf92 | 1617 | |
10a50311 JD |
1618 | /* |
1619 | * Get the consumed position | |
1620 | * | |
1621 | * Returns 0 on success, < 0 on error | |
1622 | */ | |
1623 | int lttng_ustconsumer_get_consumed_snapshot( | |
1624 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
1625 | { | |
1626 | assert(stream); | |
1627 | assert(stream->ustream); | |
1628 | assert(pos); | |
1629 | ||
1630 | return ustctl_snapshot_get_consumed(stream->ustream, pos); | |
1631 | } | |
1632 | ||
84a182ce DG |
1633 | void lttng_ustconsumer_flush_buffer(struct lttng_consumer_stream *stream, |
1634 | int producer) | |
1635 | { | |
1636 | assert(stream); | |
1637 | assert(stream->ustream); | |
1638 | ||
1639 | ustctl_flush_buffer(stream->ustream, producer); | |
1640 | } | |
1641 | ||
1642 | int lttng_ustconsumer_get_current_timestamp( | |
1643 | struct lttng_consumer_stream *stream, uint64_t *ts) | |
1644 | { | |
1645 | assert(stream); | |
1646 | assert(stream->ustream); | |
1647 | assert(ts); | |
1648 | ||
1649 | return ustctl_get_current_timestamp(stream->ustream, ts); | |
1650 | } | |
1651 | ||
ffe60014 DG |
1652 | /* |
1653 | * Called when the stream signal the consumer that it has hang up. | |
1654 | */ | |
1655 | void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream) | |
1656 | { | |
1657 | assert(stream); | |
1658 | assert(stream->ustream); | |
2c1dd183 | 1659 | |
ffe60014 DG |
1660 | ustctl_flush_buffer(stream->ustream, 0); |
1661 | stream->hangup_flush_done = 1; | |
1662 | } | |
ee77a7b0 | 1663 | |
ffe60014 DG |
1664 | void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan) |
1665 | { | |
1666 | assert(chan); | |
1667 | assert(chan->uchan); | |
e316aad5 | 1668 | |
ea88ca2a MD |
1669 | if (chan->switch_timer_enabled == 1) { |
1670 | consumer_timer_switch_stop(chan); | |
1671 | } | |
1672 | consumer_metadata_cache_destroy(chan); | |
ffe60014 | 1673 | ustctl_destroy_channel(chan->uchan); |
3bd1e081 MD |
1674 | } |
1675 | ||
1676 | void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream) | |
1677 | { | |
ffe60014 DG |
1678 | assert(stream); |
1679 | assert(stream->ustream); | |
d41f73b7 | 1680 | |
ea88ca2a MD |
1681 | if (stream->chan->switch_timer_enabled == 1) { |
1682 | consumer_timer_switch_stop(stream->chan); | |
1683 | } | |
ffe60014 DG |
1684 | ustctl_destroy_stream(stream->ustream); |
1685 | } | |
d41f73b7 | 1686 | |
6d574024 DG |
1687 | int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream) |
1688 | { | |
1689 | assert(stream); | |
1690 | assert(stream->ustream); | |
1691 | ||
1692 | return ustctl_stream_get_wakeup_fd(stream->ustream); | |
1693 | } | |
1694 | ||
1695 | int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream) | |
1696 | { | |
1697 | assert(stream); | |
1698 | assert(stream->ustream); | |
1699 | ||
1700 | return ustctl_stream_close_wakeup_fd(stream->ustream); | |
1701 | } | |
1702 | ||
309167d2 JD |
1703 | /* |
1704 | * Populate index values of a UST stream. Values are set in big endian order. | |
1705 | * | |
1706 | * Return 0 on success or else a negative value. | |
1707 | */ | |
50adc264 | 1708 | static int get_index_values(struct ctf_packet_index *index, |
309167d2 JD |
1709 | struct ustctl_consumer_stream *ustream) |
1710 | { | |
1711 | int ret; | |
1712 | ||
1713 | ret = ustctl_get_timestamp_begin(ustream, &index->timestamp_begin); | |
1714 | if (ret < 0) { | |
1715 | PERROR("ustctl_get_timestamp_begin"); | |
1716 | goto error; | |
1717 | } | |
1718 | index->timestamp_begin = htobe64(index->timestamp_begin); | |
1719 | ||
1720 | ret = ustctl_get_timestamp_end(ustream, &index->timestamp_end); | |
1721 | if (ret < 0) { | |
1722 | PERROR("ustctl_get_timestamp_end"); | |
1723 | goto error; | |
1724 | } | |
1725 | index->timestamp_end = htobe64(index->timestamp_end); | |
1726 | ||
1727 | ret = ustctl_get_events_discarded(ustream, &index->events_discarded); | |
1728 | if (ret < 0) { | |
1729 | PERROR("ustctl_get_events_discarded"); | |
1730 | goto error; | |
1731 | } | |
1732 | index->events_discarded = htobe64(index->events_discarded); | |
1733 | ||
1734 | ret = ustctl_get_content_size(ustream, &index->content_size); | |
1735 | if (ret < 0) { | |
1736 | PERROR("ustctl_get_content_size"); | |
1737 | goto error; | |
1738 | } | |
1739 | index->content_size = htobe64(index->content_size); | |
1740 | ||
1741 | ret = ustctl_get_packet_size(ustream, &index->packet_size); | |
1742 | if (ret < 0) { | |
1743 | PERROR("ustctl_get_packet_size"); | |
1744 | goto error; | |
1745 | } | |
1746 | index->packet_size = htobe64(index->packet_size); | |
1747 | ||
1748 | ret = ustctl_get_stream_id(ustream, &index->stream_id); | |
1749 | if (ret < 0) { | |
1750 | PERROR("ustctl_get_stream_id"); | |
1751 | goto error; | |
1752 | } | |
1753 | index->stream_id = htobe64(index->stream_id); | |
1754 | ||
1755 | error: | |
1756 | return ret; | |
1757 | } | |
1758 | ||
94d49140 JD |
1759 | /* |
1760 | * Write up to one packet from the metadata cache to the channel. | |
1761 | * | |
1762 | * Returns the number of bytes pushed in the cache, or a negative value | |
1763 | * on error. | |
1764 | */ | |
1765 | static | |
1766 | int commit_one_metadata_packet(struct lttng_consumer_stream *stream) | |
1767 | { | |
1768 | ssize_t write_len; | |
1769 | int ret; | |
1770 | ||
1771 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); | |
1772 | if (stream->chan->metadata_cache->contiguous | |
1773 | == stream->ust_metadata_pushed) { | |
1774 | ret = 0; | |
1775 | goto end; | |
1776 | } | |
1777 | ||
1778 | write_len = ustctl_write_one_packet_to_channel(stream->chan->uchan, | |
1779 | &stream->chan->metadata_cache->data[stream->ust_metadata_pushed], | |
1780 | stream->chan->metadata_cache->contiguous | |
1781 | - stream->ust_metadata_pushed); | |
1782 | assert(write_len != 0); | |
1783 | if (write_len < 0) { | |
1784 | ERR("Writing one metadata packet"); | |
1785 | ret = -1; | |
1786 | goto end; | |
1787 | } | |
1788 | stream->ust_metadata_pushed += write_len; | |
1789 | ||
1790 | assert(stream->chan->metadata_cache->contiguous >= | |
1791 | stream->ust_metadata_pushed); | |
1792 | ret = write_len; | |
1793 | ||
1794 | end: | |
1795 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); | |
1796 | return ret; | |
1797 | } | |
1798 | ||
309167d2 | 1799 | |
94d49140 JD |
1800 | /* |
1801 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
1802 | * metadata thread can consumer them. | |
1803 | * | |
1804 | * Metadata stream lock MUST be acquired. | |
1805 | * | |
1806 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream | |
1807 | * is empty or a negative value on error. | |
1808 | */ | |
1809 | int lttng_ustconsumer_sync_metadata(struct lttng_consumer_local_data *ctx, | |
1810 | struct lttng_consumer_stream *metadata) | |
1811 | { | |
1812 | int ret; | |
1813 | int retry = 0; | |
1814 | ||
1815 | assert(ctx); | |
1816 | assert(metadata); | |
1817 | ||
1818 | /* | |
1819 | * Request metadata from the sessiond, but don't wait for the flush | |
1820 | * because we locked the metadata thread. | |
1821 | */ | |
1822 | ret = lttng_ustconsumer_request_metadata(ctx, metadata->chan, 0, 0); | |
1823 | if (ret < 0) { | |
1824 | goto end; | |
1825 | } | |
1826 | ||
1827 | ret = commit_one_metadata_packet(metadata); | |
1828 | if (ret <= 0) { | |
1829 | goto end; | |
1830 | } else if (ret > 0) { | |
1831 | retry = 1; | |
1832 | } | |
1833 | ||
1834 | ustctl_flush_buffer(metadata->ustream, 1); | |
1835 | ret = ustctl_snapshot(metadata->ustream); | |
1836 | if (ret < 0) { | |
1837 | if (errno != EAGAIN) { | |
1838 | ERR("Sync metadata, taking UST snapshot"); | |
1839 | goto end; | |
1840 | } | |
1841 | DBG("No new metadata when syncing them."); | |
1842 | /* No new metadata, exit. */ | |
1843 | ret = ENODATA; | |
1844 | goto end; | |
1845 | } | |
1846 | ||
1847 | /* | |
1848 | * After this flush, we still need to extract metadata. | |
1849 | */ | |
1850 | if (retry) { | |
1851 | ret = EAGAIN; | |
1852 | } | |
1853 | ||
1854 | end: | |
1855 | return ret; | |
1856 | } | |
1857 | ||
02b3d176 DG |
1858 | /* |
1859 | * Return 0 on success else a negative value. | |
1860 | */ | |
1861 | static int notify_if_more_data(struct lttng_consumer_stream *stream, | |
1862 | struct lttng_consumer_local_data *ctx) | |
1863 | { | |
1864 | int ret; | |
1865 | struct ustctl_consumer_stream *ustream; | |
1866 | ||
1867 | assert(stream); | |
1868 | assert(ctx); | |
1869 | ||
1870 | ustream = stream->ustream; | |
1871 | ||
1872 | /* | |
1873 | * First, we are going to check if there is a new subbuffer available | |
1874 | * before reading the stream wait_fd. | |
1875 | */ | |
1876 | /* Get the next subbuffer */ | |
1877 | ret = ustctl_get_next_subbuf(ustream); | |
1878 | if (ret) { | |
1879 | /* No more data found, flag the stream. */ | |
1880 | stream->has_data = 0; | |
1881 | ret = 0; | |
1882 | goto end; | |
1883 | } | |
1884 | ||
5420e5db | 1885 | ret = ustctl_put_subbuf(ustream); |
02b3d176 DG |
1886 | assert(!ret); |
1887 | ||
1888 | /* This stream still has data. Flag it and wake up the data thread. */ | |
1889 | stream->has_data = 1; | |
1890 | ||
1891 | if (stream->monitor && !stream->hangup_flush_done && !ctx->has_wakeup) { | |
1892 | ssize_t writelen; | |
1893 | ||
1894 | writelen = lttng_pipe_write(ctx->consumer_wakeup_pipe, "!", 1); | |
1895 | if (writelen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
1896 | ret = writelen; | |
1897 | goto end; | |
1898 | } | |
1899 | ||
1900 | /* The wake up pipe has been notified. */ | |
1901 | ctx->has_wakeup = 1; | |
1902 | } | |
1903 | ret = 0; | |
1904 | ||
1905 | end: | |
1906 | return ret; | |
1907 | } | |
1908 | ||
94d49140 JD |
1909 | /* |
1910 | * Read subbuffer from the given stream. | |
1911 | * | |
1912 | * Stream lock MUST be acquired. | |
1913 | * | |
1914 | * Return 0 on success else a negative value. | |
1915 | */ | |
d41f73b7 MD |
1916 | int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
1917 | struct lttng_consumer_local_data *ctx) | |
1918 | { | |
1d4dfdef | 1919 | unsigned long len, subbuf_size, padding; |
1c20f0e2 | 1920 | int err, write_index = 1; |
d41f73b7 | 1921 | long ret = 0; |
ffe60014 | 1922 | struct ustctl_consumer_stream *ustream; |
50adc264 | 1923 | struct ctf_packet_index index; |
ffe60014 DG |
1924 | |
1925 | assert(stream); | |
1926 | assert(stream->ustream); | |
1927 | assert(ctx); | |
d41f73b7 | 1928 | |
3eb914c0 | 1929 | DBG("In UST read_subbuffer (wait_fd: %d, name: %s)", stream->wait_fd, |
ffe60014 DG |
1930 | stream->name); |
1931 | ||
1932 | /* Ease our life for what's next. */ | |
1933 | ustream = stream->ustream; | |
d41f73b7 | 1934 | |
6cd525e8 | 1935 | /* |
02b3d176 DG |
1936 | * We can consume the 1 byte written into the wait_fd by UST. Don't trigger |
1937 | * error if we cannot read this one byte (read returns 0), or if the error | |
1938 | * is EAGAIN or EWOULDBLOCK. | |
1939 | * | |
1940 | * This is only done when the stream is monitored by a thread, before the | |
1941 | * flush is done after a hangup and if the stream is not flagged with data | |
1942 | * since there might be nothing to consume in the wait fd but still have | |
1943 | * data available flagged by the consumer wake up pipe. | |
6cd525e8 | 1944 | */ |
02b3d176 DG |
1945 | if (stream->monitor && !stream->hangup_flush_done && !stream->has_data) { |
1946 | char dummy; | |
c617c0c6 MD |
1947 | ssize_t readlen; |
1948 | ||
6cd525e8 MD |
1949 | readlen = lttng_read(stream->wait_fd, &dummy, 1); |
1950 | if (readlen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
effcf122 MD |
1951 | ret = readlen; |
1952 | goto end; | |
1953 | } | |
d41f73b7 MD |
1954 | } |
1955 | ||
04ef1097 | 1956 | retry: |
d41f73b7 | 1957 | /* Get the next subbuffer */ |
ffe60014 | 1958 | err = ustctl_get_next_subbuf(ustream); |
d41f73b7 | 1959 | if (err != 0) { |
04ef1097 MD |
1960 | /* |
1961 | * Populate metadata info if the existing info has | |
1962 | * already been read. | |
1963 | */ | |
1964 | if (stream->metadata_flag) { | |
94d49140 JD |
1965 | ret = commit_one_metadata_packet(stream); |
1966 | if (ret <= 0) { | |
04ef1097 MD |
1967 | goto end; |
1968 | } | |
04ef1097 MD |
1969 | ustctl_flush_buffer(stream->ustream, 1); |
1970 | goto retry; | |
1971 | } | |
1972 | ||
1d4dfdef | 1973 | ret = err; /* ustctl_get_next_subbuf returns negative, caller expect positive. */ |
d41f73b7 MD |
1974 | /* |
1975 | * This is a debug message even for single-threaded consumer, | |
1976 | * because poll() have more relaxed criterions than get subbuf, | |
1977 | * so get_subbuf may fail for short race windows where poll() | |
1978 | * would issue wakeups. | |
1979 | */ | |
1980 | DBG("Reserving sub buffer failed (everything is normal, " | |
ffe60014 | 1981 | "it is due to concurrency) [ret: %d]", err); |
d41f73b7 MD |
1982 | goto end; |
1983 | } | |
ffe60014 | 1984 | assert(stream->chan->output == CONSUMER_CHANNEL_MMAP); |
309167d2 | 1985 | |
1c20f0e2 | 1986 | if (!stream->metadata_flag) { |
309167d2 JD |
1987 | index.offset = htobe64(stream->out_fd_offset); |
1988 | ret = get_index_values(&index, ustream); | |
1989 | if (ret < 0) { | |
1990 | goto end; | |
1991 | } | |
1c20f0e2 JD |
1992 | } else { |
1993 | write_index = 0; | |
309167d2 JD |
1994 | } |
1995 | ||
1d4dfdef | 1996 | /* Get the full padded subbuffer size */ |
ffe60014 | 1997 | err = ustctl_get_padded_subbuf_size(ustream, &len); |
effcf122 | 1998 | assert(err == 0); |
1d4dfdef DG |
1999 | |
2000 | /* Get subbuffer data size (without padding) */ | |
ffe60014 | 2001 | err = ustctl_get_subbuf_size(ustream, &subbuf_size); |
1d4dfdef DG |
2002 | assert(err == 0); |
2003 | ||
2004 | /* Make sure we don't get a subbuffer size bigger than the padded */ | |
2005 | assert(len >= subbuf_size); | |
2006 | ||
2007 | padding = len - subbuf_size; | |
d41f73b7 | 2008 | /* write the subbuffer to the tracefile */ |
309167d2 | 2009 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, padding, &index); |
91dfef6e DG |
2010 | /* |
2011 | * The mmap operation should write subbuf_size amount of data when network | |
2012 | * streaming or the full padding (len) size when we are _not_ streaming. | |
2013 | */ | |
d88aee68 DG |
2014 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
2015 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
d41f73b7 | 2016 | /* |
91dfef6e | 2017 | * Display the error but continue processing to try to release the |
c5c45efa DG |
2018 | * subbuffer. This is a DBG statement since any unexpected kill or |
2019 | * signal, the application gets unregistered, relayd gets closed or | |
2020 | * anything that affects the buffer lifetime will trigger this error. | |
2021 | * So, for the sake of the user, don't print this error since it can | |
2022 | * happen and it is OK with the code flow. | |
d41f73b7 | 2023 | */ |
c5c45efa | 2024 | DBG("Error writing to tracefile " |
8fd623e0 | 2025 | "(ret: %ld != len: %lu != subbuf_size: %lu)", |
91dfef6e | 2026 | ret, len, subbuf_size); |
309167d2 | 2027 | write_index = 0; |
d41f73b7 | 2028 | } |
ffe60014 | 2029 | err = ustctl_put_next_subbuf(ustream); |
effcf122 | 2030 | assert(err == 0); |
331744e3 | 2031 | |
02b3d176 DG |
2032 | /* |
2033 | * This will consumer the byte on the wait_fd if and only if there is not | |
2034 | * next subbuffer to be acquired. | |
2035 | */ | |
2036 | if (!stream->metadata_flag) { | |
2037 | ret = notify_if_more_data(stream, ctx); | |
2038 | if (ret < 0) { | |
2039 | goto end; | |
2040 | } | |
2041 | } | |
2042 | ||
309167d2 | 2043 | /* Write index if needed. */ |
1c20f0e2 JD |
2044 | if (!write_index) { |
2045 | goto end; | |
2046 | } | |
2047 | ||
94d49140 JD |
2048 | if (stream->chan->live_timer_interval && !stream->metadata_flag) { |
2049 | /* | |
2050 | * In live, block until all the metadata is sent. | |
2051 | */ | |
2052 | err = consumer_stream_sync_metadata(ctx, stream->session_id); | |
2053 | if (err < 0) { | |
2054 | goto end; | |
2055 | } | |
2056 | } | |
2057 | ||
1c20f0e2 JD |
2058 | assert(!stream->metadata_flag); |
2059 | err = consumer_stream_write_index(stream, &index); | |
2060 | if (err < 0) { | |
2061 | goto end; | |
309167d2 JD |
2062 | } |
2063 | ||
d41f73b7 MD |
2064 | end: |
2065 | return ret; | |
2066 | } | |
2067 | ||
ffe60014 DG |
2068 | /* |
2069 | * Called when a stream is created. | |
fe4477ee JD |
2070 | * |
2071 | * Return 0 on success or else a negative value. | |
ffe60014 | 2072 | */ |
d41f73b7 MD |
2073 | int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream) |
2074 | { | |
fe4477ee JD |
2075 | int ret; |
2076 | ||
10a50311 JD |
2077 | assert(stream); |
2078 | ||
fe4477ee | 2079 | /* Don't create anything if this is set for streaming. */ |
10a50311 | 2080 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { |
fe4477ee JD |
2081 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
2082 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
309167d2 | 2083 | stream->uid, stream->gid, NULL); |
fe4477ee JD |
2084 | if (ret < 0) { |
2085 | goto error; | |
2086 | } | |
2087 | stream->out_fd = ret; | |
2088 | stream->tracefile_size_current = 0; | |
309167d2 JD |
2089 | |
2090 | if (!stream->metadata_flag) { | |
2091 | ret = index_create_file(stream->chan->pathname, | |
2092 | stream->name, stream->uid, stream->gid, | |
2093 | stream->chan->tracefile_size, | |
2094 | stream->tracefile_count_current); | |
2095 | if (ret < 0) { | |
2096 | goto error; | |
2097 | } | |
2098 | stream->index_fd = ret; | |
2099 | } | |
fe4477ee JD |
2100 | } |
2101 | ret = 0; | |
2102 | ||
2103 | error: | |
2104 | return ret; | |
d41f73b7 | 2105 | } |
ca22feea DG |
2106 | |
2107 | /* | |
2108 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
2109 | * stream. Consumer data lock MUST be acquired before calling this function |
2110 | * and the stream lock. | |
ca22feea | 2111 | * |
6d805429 | 2112 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
2113 | * data is available for trace viewer reading. |
2114 | */ | |
6d805429 | 2115 | int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
2116 | { |
2117 | int ret; | |
2118 | ||
2119 | assert(stream); | |
ffe60014 | 2120 | assert(stream->ustream); |
ca22feea | 2121 | |
6d805429 | 2122 | DBG("UST consumer checking data pending"); |
c8f59ee5 | 2123 | |
ca6b395f MD |
2124 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
2125 | ret = 0; | |
2126 | goto end; | |
2127 | } | |
2128 | ||
04ef1097 | 2129 | if (stream->chan->type == CONSUMER_CHANNEL_TYPE_METADATA) { |
e6ee4eab DG |
2130 | uint64_t contiguous, pushed; |
2131 | ||
2132 | /* Ease our life a bit. */ | |
2133 | contiguous = stream->chan->metadata_cache->contiguous; | |
2134 | pushed = stream->ust_metadata_pushed; | |
2135 | ||
04ef1097 MD |
2136 | /* |
2137 | * We can simply check whether all contiguously available data | |
2138 | * has been pushed to the ring buffer, since the push operation | |
2139 | * is performed within get_next_subbuf(), and because both | |
2140 | * get_next_subbuf() and put_next_subbuf() are issued atomically | |
2141 | * thanks to the stream lock within | |
2142 | * lttng_ustconsumer_read_subbuffer(). This basically means that | |
2143 | * whetnever ust_metadata_pushed is incremented, the associated | |
2144 | * metadata has been consumed from the metadata stream. | |
2145 | */ | |
2146 | DBG("UST consumer metadata pending check: contiguous %" PRIu64 " vs pushed %" PRIu64, | |
e6ee4eab | 2147 | contiguous, pushed); |
aa01b94c | 2148 | assert(((int64_t) (contiguous - pushed)) >= 0); |
e6ee4eab | 2149 | if ((contiguous != pushed) || |
6acdf328 | 2150 | (((int64_t) contiguous - pushed) > 0 || contiguous == 0)) { |
04ef1097 MD |
2151 | ret = 1; /* Data is pending */ |
2152 | goto end; | |
2153 | } | |
2154 | } else { | |
2155 | ret = ustctl_get_next_subbuf(stream->ustream); | |
2156 | if (ret == 0) { | |
2157 | /* | |
2158 | * There is still data so let's put back this | |
2159 | * subbuffer. | |
2160 | */ | |
2161 | ret = ustctl_put_subbuf(stream->ustream); | |
2162 | assert(ret == 0); | |
2163 | ret = 1; /* Data is pending */ | |
2164 | goto end; | |
2165 | } | |
ca22feea DG |
2166 | } |
2167 | ||
6d805429 DG |
2168 | /* Data is NOT pending so ready to be read. */ |
2169 | ret = 0; | |
ca22feea | 2170 | |
6efae65e DG |
2171 | end: |
2172 | return ret; | |
ca22feea | 2173 | } |
d88aee68 | 2174 | |
6d574024 DG |
2175 | /* |
2176 | * Stop a given metadata channel timer if enabled and close the wait fd which | |
2177 | * is the poll pipe of the metadata stream. | |
2178 | * | |
2179 | * This MUST be called with the metadata channel acquired. | |
2180 | */ | |
2181 | void lttng_ustconsumer_close_metadata(struct lttng_consumer_channel *metadata) | |
2182 | { | |
2183 | int ret; | |
2184 | ||
2185 | assert(metadata); | |
2186 | assert(metadata->type == CONSUMER_CHANNEL_TYPE_METADATA); | |
2187 | ||
2188 | DBG("Closing metadata channel key %" PRIu64, metadata->key); | |
2189 | ||
2190 | if (metadata->switch_timer_enabled == 1) { | |
2191 | consumer_timer_switch_stop(metadata); | |
2192 | } | |
2193 | ||
2194 | if (!metadata->metadata_stream) { | |
2195 | goto end; | |
2196 | } | |
2197 | ||
2198 | /* | |
2199 | * Closing write side so the thread monitoring the stream wakes up if any | |
2200 | * and clean the metadata stream. | |
2201 | */ | |
2202 | if (metadata->metadata_stream->ust_metadata_poll_pipe[1] >= 0) { | |
2203 | ret = close(metadata->metadata_stream->ust_metadata_poll_pipe[1]); | |
2204 | if (ret < 0) { | |
2205 | PERROR("closing metadata pipe write side"); | |
2206 | } | |
2207 | metadata->metadata_stream->ust_metadata_poll_pipe[1] = -1; | |
2208 | } | |
2209 | ||
2210 | end: | |
2211 | return; | |
2212 | } | |
2213 | ||
d88aee68 DG |
2214 | /* |
2215 | * Close every metadata stream wait fd of the metadata hash table. This | |
2216 | * function MUST be used very carefully so not to run into a race between the | |
2217 | * metadata thread handling streams and this function closing their wait fd. | |
2218 | * | |
2219 | * For UST, this is used when the session daemon hangs up. Its the metadata | |
2220 | * producer so calling this is safe because we are assured that no state change | |
2221 | * can occur in the metadata thread for the streams in the hash table. | |
2222 | */ | |
6d574024 | 2223 | void lttng_ustconsumer_close_all_metadata(struct lttng_ht *metadata_ht) |
d88aee68 | 2224 | { |
d88aee68 DG |
2225 | struct lttng_ht_iter iter; |
2226 | struct lttng_consumer_stream *stream; | |
2227 | ||
2228 | assert(metadata_ht); | |
2229 | assert(metadata_ht->ht); | |
2230 | ||
2231 | DBG("UST consumer closing all metadata streams"); | |
2232 | ||
2233 | rcu_read_lock(); | |
2234 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, | |
2235 | node.node) { | |
9ce5646a MD |
2236 | |
2237 | health_code_update(); | |
2238 | ||
be2b50c7 | 2239 | pthread_mutex_lock(&stream->chan->lock); |
6d574024 | 2240 | lttng_ustconsumer_close_metadata(stream->chan); |
be2b50c7 DG |
2241 | pthread_mutex_unlock(&stream->chan->lock); |
2242 | ||
d88aee68 DG |
2243 | } |
2244 | rcu_read_unlock(); | |
2245 | } | |
d8ef542d MD |
2246 | |
2247 | void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream) | |
2248 | { | |
2249 | int ret; | |
2250 | ||
2251 | ret = ustctl_stream_close_wakeup_fd(stream->ustream); | |
2252 | if (ret < 0) { | |
2253 | ERR("Unable to close wakeup fd"); | |
2254 | } | |
2255 | } | |
331744e3 | 2256 | |
f666ae70 MD |
2257 | /* |
2258 | * Please refer to consumer-timer.c before adding any lock within this | |
2259 | * function or any of its callees. Timers have a very strict locking | |
2260 | * semantic with respect to teardown. Failure to respect this semantic | |
2261 | * introduces deadlocks. | |
2262 | */ | |
331744e3 | 2263 | int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx, |
94d49140 | 2264 | struct lttng_consumer_channel *channel, int timer, int wait) |
331744e3 JD |
2265 | { |
2266 | struct lttcomm_metadata_request_msg request; | |
2267 | struct lttcomm_consumer_msg msg; | |
0c759fc9 | 2268 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
331744e3 JD |
2269 | uint64_t len, key, offset; |
2270 | int ret; | |
2271 | ||
2272 | assert(channel); | |
2273 | assert(channel->metadata_cache); | |
2274 | ||
53efb85a MD |
2275 | memset(&request, 0, sizeof(request)); |
2276 | ||
331744e3 JD |
2277 | /* send the metadata request to sessiond */ |
2278 | switch (consumer_data.type) { | |
2279 | case LTTNG_CONSUMER64_UST: | |
2280 | request.bits_per_long = 64; | |
2281 | break; | |
2282 | case LTTNG_CONSUMER32_UST: | |
2283 | request.bits_per_long = 32; | |
2284 | break; | |
2285 | default: | |
2286 | request.bits_per_long = 0; | |
2287 | break; | |
2288 | } | |
2289 | ||
2290 | request.session_id = channel->session_id; | |
1950109e | 2291 | request.session_id_per_pid = channel->session_id_per_pid; |
567eb353 DG |
2292 | /* |
2293 | * Request the application UID here so the metadata of that application can | |
2294 | * be sent back. The channel UID corresponds to the user UID of the session | |
2295 | * used for the rights on the stream file(s). | |
2296 | */ | |
2297 | request.uid = channel->ust_app_uid; | |
331744e3 | 2298 | request.key = channel->key; |
567eb353 | 2299 | |
1950109e | 2300 | DBG("Sending metadata request to sessiond, session id %" PRIu64 |
567eb353 DG |
2301 | ", per-pid %" PRIu64 ", app UID %u and channek key %" PRIu64, |
2302 | request.session_id, request.session_id_per_pid, request.uid, | |
2303 | request.key); | |
331744e3 | 2304 | |
75d83e50 | 2305 | pthread_mutex_lock(&ctx->metadata_socket_lock); |
9ce5646a MD |
2306 | |
2307 | health_code_update(); | |
2308 | ||
331744e3 JD |
2309 | ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request, |
2310 | sizeof(request)); | |
2311 | if (ret < 0) { | |
2312 | ERR("Asking metadata to sessiond"); | |
2313 | goto end; | |
2314 | } | |
2315 | ||
9ce5646a MD |
2316 | health_code_update(); |
2317 | ||
331744e3 JD |
2318 | /* Receive the metadata from sessiond */ |
2319 | ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg, | |
2320 | sizeof(msg)); | |
2321 | if (ret != sizeof(msg)) { | |
8fd623e0 | 2322 | DBG("Consumer received unexpected message size %d (expects %zu)", |
331744e3 JD |
2323 | ret, sizeof(msg)); |
2324 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); | |
2325 | /* | |
2326 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
2327 | * since the caller handles this. | |
2328 | */ | |
2329 | goto end; | |
2330 | } | |
2331 | ||
9ce5646a MD |
2332 | health_code_update(); |
2333 | ||
331744e3 JD |
2334 | if (msg.cmd_type == LTTNG_ERR_UND) { |
2335 | /* No registry found */ | |
2336 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, | |
2337 | ret_code); | |
2338 | ret = 0; | |
2339 | goto end; | |
2340 | } else if (msg.cmd_type != LTTNG_CONSUMER_PUSH_METADATA) { | |
2341 | ERR("Unexpected cmd_type received %d", msg.cmd_type); | |
2342 | ret = -1; | |
2343 | goto end; | |
2344 | } | |
2345 | ||
2346 | len = msg.u.push_metadata.len; | |
2347 | key = msg.u.push_metadata.key; | |
2348 | offset = msg.u.push_metadata.target_offset; | |
2349 | ||
2350 | assert(key == channel->key); | |
2351 | if (len == 0) { | |
2352 | DBG("No new metadata to receive for key %" PRIu64, key); | |
2353 | } | |
2354 | ||
9ce5646a MD |
2355 | health_code_update(); |
2356 | ||
331744e3 JD |
2357 | /* Tell session daemon we are ready to receive the metadata. */ |
2358 | ret = consumer_send_status_msg(ctx->consumer_metadata_socket, | |
0c759fc9 | 2359 | LTTCOMM_CONSUMERD_SUCCESS); |
331744e3 JD |
2360 | if (ret < 0 || len == 0) { |
2361 | /* | |
2362 | * Somehow, the session daemon is not responding anymore or there is | |
2363 | * nothing to receive. | |
2364 | */ | |
2365 | goto end; | |
2366 | } | |
2367 | ||
9ce5646a MD |
2368 | health_code_update(); |
2369 | ||
1eb682be | 2370 | ret = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket, |
94d49140 | 2371 | key, offset, len, channel, timer, wait); |
1eb682be | 2372 | if (ret >= 0) { |
f2a444f1 DG |
2373 | /* |
2374 | * Only send the status msg if the sessiond is alive meaning a positive | |
2375 | * ret code. | |
2376 | */ | |
1eb682be | 2377 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret); |
f2a444f1 | 2378 | } |
331744e3 JD |
2379 | ret = 0; |
2380 | ||
2381 | end: | |
9ce5646a MD |
2382 | health_code_update(); |
2383 | ||
75d83e50 | 2384 | pthread_mutex_unlock(&ctx->metadata_socket_lock); |
331744e3 JD |
2385 | return ret; |
2386 | } | |
70190e1c DG |
2387 | |
2388 | /* | |
2389 | * Return the ustctl call for the get stream id. | |
2390 | */ | |
2391 | int lttng_ustconsumer_get_stream_id(struct lttng_consumer_stream *stream, | |
2392 | uint64_t *stream_id) | |
2393 | { | |
2394 | assert(stream); | |
2395 | assert(stream_id); | |
2396 | ||
2397 | return ustctl_get_stream_id(stream->ustream, stream_id); | |
2398 | } |