Commit | Line | Data |
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3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * | |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
3bd1e081 MD |
8 | * |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
3bd1e081 MD |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <assert.h> | |
f02e1e8a | 21 | #include <lttng/ust-ctl.h> |
3bd1e081 MD |
22 | #include <poll.h> |
23 | #include <pthread.h> | |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | #include <sys/mman.h> | |
27 | #include <sys/socket.h> | |
dbb5dfe6 | 28 | #include <sys/stat.h> |
3bd1e081 | 29 | #include <sys/types.h> |
77c7c900 | 30 | #include <inttypes.h> |
3bd1e081 | 31 | #include <unistd.h> |
ffe60014 | 32 | #include <urcu/list.h> |
331744e3 | 33 | #include <signal.h> |
0857097f | 34 | |
990570ed | 35 | #include <common/common.h> |
10a8a223 | 36 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 37 | #include <common/relayd/relayd.h> |
dbb5dfe6 | 38 | #include <common/compat/fcntl.h> |
331744e3 | 39 | #include <common/consumer-metadata-cache.h> |
10a50311 | 40 | #include <common/consumer-stream.h> |
331744e3 | 41 | #include <common/consumer-timer.h> |
fe4477ee | 42 | #include <common/utils.h> |
10a8a223 DG |
43 | |
44 | #include "ust-consumer.h" | |
3bd1e081 MD |
45 | |
46 | extern struct lttng_consumer_global_data consumer_data; | |
47 | extern int consumer_poll_timeout; | |
48 | extern volatile int consumer_quit; | |
49 | ||
50 | /* | |
ffe60014 DG |
51 | * Free channel object and all streams associated with it. This MUST be used |
52 | * only and only if the channel has _NEVER_ been added to the global channel | |
53 | * hash table. | |
3bd1e081 | 54 | */ |
ffe60014 | 55 | static void destroy_channel(struct lttng_consumer_channel *channel) |
3bd1e081 | 56 | { |
ffe60014 DG |
57 | struct lttng_consumer_stream *stream, *stmp; |
58 | ||
59 | assert(channel); | |
60 | ||
61 | DBG("UST consumer cleaning stream list"); | |
62 | ||
63 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
64 | send_node) { | |
65 | cds_list_del(&stream->send_node); | |
66 | ustctl_destroy_stream(stream->ustream); | |
67 | free(stream); | |
68 | } | |
69 | ||
70 | /* | |
71 | * If a channel is available meaning that was created before the streams | |
72 | * were, delete it. | |
73 | */ | |
74 | if (channel->uchan) { | |
75 | lttng_ustconsumer_del_channel(channel); | |
76 | } | |
77 | free(channel); | |
78 | } | |
3bd1e081 MD |
79 | |
80 | /* | |
ffe60014 | 81 | * Add channel to internal consumer state. |
3bd1e081 | 82 | * |
ffe60014 | 83 | * Returns 0 on success or else a negative value. |
3bd1e081 | 84 | */ |
ffe60014 DG |
85 | static int add_channel(struct lttng_consumer_channel *channel, |
86 | struct lttng_consumer_local_data *ctx) | |
3bd1e081 MD |
87 | { |
88 | int ret = 0; | |
89 | ||
ffe60014 DG |
90 | assert(channel); |
91 | assert(ctx); | |
92 | ||
93 | if (ctx->on_recv_channel != NULL) { | |
94 | ret = ctx->on_recv_channel(channel); | |
95 | if (ret == 0) { | |
d8ef542d | 96 | ret = consumer_add_channel(channel, ctx); |
ffe60014 DG |
97 | } else if (ret < 0) { |
98 | /* Most likely an ENOMEM. */ | |
99 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
100 | goto error; | |
101 | } | |
102 | } else { | |
d8ef542d | 103 | ret = consumer_add_channel(channel, ctx); |
3bd1e081 MD |
104 | } |
105 | ||
d88aee68 | 106 | DBG("UST consumer channel added (key: %" PRIu64 ")", channel->key); |
ffe60014 DG |
107 | |
108 | error: | |
3bd1e081 MD |
109 | return ret; |
110 | } | |
111 | ||
112 | /* | |
ffe60014 DG |
113 | * Allocate and return a consumer channel object. |
114 | */ | |
115 | static struct lttng_consumer_channel *allocate_channel(uint64_t session_id, | |
116 | const char *pathname, const char *name, uid_t uid, gid_t gid, | |
da009f2c | 117 | uint64_t relayd_id, uint64_t key, enum lttng_event_output output, |
2bba9e53 | 118 | uint64_t tracefile_size, uint64_t tracefile_count, |
1950109e | 119 | uint64_t session_id_per_pid, unsigned int monitor) |
ffe60014 DG |
120 | { |
121 | assert(pathname); | |
122 | assert(name); | |
123 | ||
1950109e JD |
124 | return consumer_allocate_channel(key, session_id, pathname, name, uid, |
125 | gid, relayd_id, output, tracefile_size, | |
126 | tracefile_count, session_id_per_pid, monitor); | |
ffe60014 DG |
127 | } |
128 | ||
129 | /* | |
130 | * Allocate and return a consumer stream object. If _alloc_ret is not NULL, the | |
131 | * error value if applicable is set in it else it is kept untouched. | |
3bd1e081 | 132 | * |
ffe60014 | 133 | * Return NULL on error else the newly allocated stream object. |
3bd1e081 | 134 | */ |
ffe60014 DG |
135 | static struct lttng_consumer_stream *allocate_stream(int cpu, int key, |
136 | struct lttng_consumer_channel *channel, | |
137 | struct lttng_consumer_local_data *ctx, int *_alloc_ret) | |
138 | { | |
139 | int alloc_ret; | |
140 | struct lttng_consumer_stream *stream = NULL; | |
141 | ||
142 | assert(channel); | |
143 | assert(ctx); | |
144 | ||
145 | stream = consumer_allocate_stream(channel->key, | |
146 | key, | |
147 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
148 | channel->name, | |
149 | channel->uid, | |
150 | channel->gid, | |
151 | channel->relayd_id, | |
152 | channel->session_id, | |
153 | cpu, | |
154 | &alloc_ret, | |
4891ece8 DG |
155 | channel->type, |
156 | channel->monitor); | |
ffe60014 DG |
157 | if (stream == NULL) { |
158 | switch (alloc_ret) { | |
159 | case -ENOENT: | |
160 | /* | |
161 | * We could not find the channel. Can happen if cpu hotplug | |
162 | * happens while tearing down. | |
163 | */ | |
164 | DBG3("Could not find channel"); | |
165 | break; | |
166 | case -ENOMEM: | |
167 | case -EINVAL: | |
168 | default: | |
169 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
170 | break; | |
171 | } | |
172 | goto error; | |
173 | } | |
174 | ||
175 | stream->chan = channel; | |
176 | ||
177 | error: | |
178 | if (_alloc_ret) { | |
179 | *_alloc_ret = alloc_ret; | |
180 | } | |
181 | return stream; | |
182 | } | |
183 | ||
184 | /* | |
185 | * Send the given stream pointer to the corresponding thread. | |
186 | * | |
187 | * Returns 0 on success else a negative value. | |
188 | */ | |
189 | static int send_stream_to_thread(struct lttng_consumer_stream *stream, | |
190 | struct lttng_consumer_local_data *ctx) | |
191 | { | |
dae10966 DG |
192 | int ret; |
193 | struct lttng_pipe *stream_pipe; | |
ffe60014 DG |
194 | |
195 | /* Get the right pipe where the stream will be sent. */ | |
196 | if (stream->metadata_flag) { | |
dae10966 | 197 | stream_pipe = ctx->consumer_metadata_pipe; |
ffe60014 | 198 | } else { |
dae10966 | 199 | stream_pipe = ctx->consumer_data_pipe; |
ffe60014 DG |
200 | } |
201 | ||
dae10966 | 202 | ret = lttng_pipe_write(stream_pipe, &stream, sizeof(stream)); |
ffe60014 | 203 | if (ret < 0) { |
dae10966 DG |
204 | ERR("Consumer write %s stream to pipe %d", |
205 | stream->metadata_flag ? "metadata" : "data", | |
206 | lttng_pipe_get_writefd(stream_pipe)); | |
ffe60014 DG |
207 | } |
208 | ||
209 | return ret; | |
210 | } | |
211 | ||
212 | /* | |
213 | * Search for a relayd object related to the stream. If found, send the stream | |
214 | * to the relayd. | |
215 | * | |
216 | * On success, returns 0 else a negative value. | |
217 | */ | |
218 | static int send_stream_to_relayd(struct lttng_consumer_stream *stream) | |
219 | { | |
220 | int ret = 0; | |
221 | struct consumer_relayd_sock_pair *relayd; | |
222 | ||
223 | assert(stream); | |
224 | ||
225 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
226 | if (relayd != NULL) { | |
227 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
228 | /* Add stream on the relayd */ | |
229 | ret = relayd_add_stream(&relayd->control_sock, stream->name, | |
0f907de1 JD |
230 | stream->chan->pathname, &stream->relayd_stream_id, |
231 | stream->chan->tracefile_size, | |
232 | stream->chan->tracefile_count); | |
ffe60014 DG |
233 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); |
234 | if (ret < 0) { | |
235 | goto error; | |
236 | } | |
d88aee68 DG |
237 | } else if (stream->net_seq_idx != (uint64_t) -1ULL) { |
238 | ERR("Network sequence index %" PRIu64 " unknown. Not adding stream.", | |
ffe60014 DG |
239 | stream->net_seq_idx); |
240 | ret = -1; | |
241 | goto error; | |
242 | } | |
243 | ||
244 | error: | |
245 | return ret; | |
246 | } | |
247 | ||
d88aee68 DG |
248 | /* |
249 | * Create streams for the given channel using liblttng-ust-ctl. | |
250 | * | |
251 | * Return 0 on success else a negative value. | |
252 | */ | |
ffe60014 DG |
253 | static int create_ust_streams(struct lttng_consumer_channel *channel, |
254 | struct lttng_consumer_local_data *ctx) | |
255 | { | |
256 | int ret, cpu = 0; | |
257 | struct ustctl_consumer_stream *ustream; | |
258 | struct lttng_consumer_stream *stream; | |
259 | ||
260 | assert(channel); | |
261 | assert(ctx); | |
262 | ||
263 | /* | |
264 | * While a stream is available from ustctl. When NULL is returned, we've | |
265 | * reached the end of the possible stream for the channel. | |
266 | */ | |
267 | while ((ustream = ustctl_create_stream(channel->uchan, cpu))) { | |
268 | int wait_fd; | |
269 | ||
749d339a | 270 | wait_fd = ustctl_stream_get_wait_fd(ustream); |
ffe60014 DG |
271 | |
272 | /* Allocate consumer stream object. */ | |
273 | stream = allocate_stream(cpu, wait_fd, channel, ctx, &ret); | |
274 | if (!stream) { | |
275 | goto error_alloc; | |
276 | } | |
277 | stream->ustream = ustream; | |
278 | /* | |
279 | * Store it so we can save multiple function calls afterwards since | |
280 | * this value is used heavily in the stream threads. This is UST | |
281 | * specific so this is why it's done after allocation. | |
282 | */ | |
283 | stream->wait_fd = wait_fd; | |
284 | ||
b31398bb DG |
285 | /* |
286 | * Increment channel refcount since the channel reference has now been | |
287 | * assigned in the allocation process above. | |
288 | */ | |
10a50311 JD |
289 | if (stream->chan->monitor) { |
290 | uatomic_inc(&stream->chan->refcount); | |
291 | } | |
b31398bb | 292 | |
ffe60014 DG |
293 | /* |
294 | * Order is important this is why a list is used. On error, the caller | |
295 | * should clean this list. | |
296 | */ | |
297 | cds_list_add_tail(&stream->send_node, &channel->streams.head); | |
298 | ||
299 | ret = ustctl_get_max_subbuf_size(stream->ustream, | |
300 | &stream->max_sb_size); | |
301 | if (ret < 0) { | |
302 | ERR("ustctl_get_max_subbuf_size failed for stream %s", | |
303 | stream->name); | |
304 | goto error; | |
305 | } | |
306 | ||
307 | /* Do actions once stream has been received. */ | |
308 | if (ctx->on_recv_stream) { | |
309 | ret = ctx->on_recv_stream(stream); | |
310 | if (ret < 0) { | |
311 | goto error; | |
312 | } | |
313 | } | |
314 | ||
d88aee68 | 315 | DBG("UST consumer add stream %s (key: %" PRIu64 ") with relayd id %" PRIu64, |
ffe60014 DG |
316 | stream->name, stream->key, stream->relayd_stream_id); |
317 | ||
318 | /* Set next CPU stream. */ | |
319 | channel->streams.count = ++cpu; | |
d88aee68 DG |
320 | |
321 | /* Keep stream reference when creating metadata. */ | |
322 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) { | |
323 | channel->metadata_stream = stream; | |
324 | } | |
ffe60014 DG |
325 | } |
326 | ||
327 | return 0; | |
328 | ||
329 | error: | |
330 | error_alloc: | |
331 | return ret; | |
332 | } | |
333 | ||
334 | /* | |
335 | * Create an UST channel with the given attributes and send it to the session | |
336 | * daemon using the ust ctl API. | |
337 | * | |
338 | * Return 0 on success or else a negative value. | |
339 | */ | |
340 | static int create_ust_channel(struct ustctl_consumer_channel_attr *attr, | |
341 | struct ustctl_consumer_channel **chanp) | |
342 | { | |
343 | int ret; | |
344 | struct ustctl_consumer_channel *channel; | |
345 | ||
346 | assert(attr); | |
347 | assert(chanp); | |
348 | ||
349 | DBG3("Creating channel to ustctl with attr: [overwrite: %d, " | |
350 | "subbuf_size: %" PRIu64 ", num_subbuf: %" PRIu64 ", " | |
351 | "switch_timer_interval: %u, read_timer_interval: %u, " | |
352 | "output: %d, type: %d", attr->overwrite, attr->subbuf_size, | |
353 | attr->num_subbuf, attr->switch_timer_interval, | |
354 | attr->read_timer_interval, attr->output, attr->type); | |
355 | ||
356 | channel = ustctl_create_channel(attr); | |
357 | if (!channel) { | |
358 | ret = -1; | |
359 | goto error_create; | |
360 | } | |
361 | ||
362 | *chanp = channel; | |
363 | ||
364 | return 0; | |
365 | ||
366 | error_create: | |
367 | return ret; | |
368 | } | |
369 | ||
d88aee68 DG |
370 | /* |
371 | * Send a single given stream to the session daemon using the sock. | |
372 | * | |
373 | * Return 0 on success else a negative value. | |
374 | */ | |
ffe60014 DG |
375 | static int send_sessiond_stream(int sock, struct lttng_consumer_stream *stream) |
376 | { | |
377 | int ret; | |
378 | ||
379 | assert(stream); | |
380 | assert(sock >= 0); | |
381 | ||
d88aee68 | 382 | DBG2("UST consumer sending stream %" PRIu64 " to sessiond", stream->key); |
ffe60014 DG |
383 | |
384 | /* Send stream to session daemon. */ | |
385 | ret = ustctl_send_stream_to_sessiond(sock, stream->ustream); | |
386 | if (ret < 0) { | |
387 | goto error; | |
388 | } | |
389 | ||
ffe60014 DG |
390 | error: |
391 | return ret; | |
392 | } | |
393 | ||
394 | /* | |
395 | * Send channel to sessiond. | |
396 | * | |
d88aee68 | 397 | * Return 0 on success or else a negative value. |
ffe60014 DG |
398 | */ |
399 | static int send_sessiond_channel(int sock, | |
400 | struct lttng_consumer_channel *channel, | |
401 | struct lttng_consumer_local_data *ctx, int *relayd_error) | |
402 | { | |
f2a444f1 | 403 | int ret, ret_code = LTTNG_OK; |
ffe60014 DG |
404 | struct lttng_consumer_stream *stream; |
405 | ||
406 | assert(channel); | |
407 | assert(ctx); | |
408 | assert(sock >= 0); | |
409 | ||
410 | DBG("UST consumer sending channel %s to sessiond", channel->name); | |
411 | ||
ffe60014 DG |
412 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { |
413 | /* Try to send the stream to the relayd if one is available. */ | |
414 | ret = send_stream_to_relayd(stream); | |
415 | if (ret < 0) { | |
416 | /* | |
417 | * Flag that the relayd was the problem here probably due to a | |
418 | * communicaton error on the socket. | |
419 | */ | |
420 | if (relayd_error) { | |
421 | *relayd_error = 1; | |
422 | } | |
f2a444f1 | 423 | ret_code = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
ffe60014 | 424 | } |
f2a444f1 | 425 | } |
ffe60014 | 426 | |
f2a444f1 DG |
427 | /* Inform sessiond that we are about to send channel and streams. */ |
428 | ret = consumer_send_status_msg(sock, ret_code); | |
429 | if (ret < 0 || ret_code != LTTNG_OK) { | |
430 | /* | |
431 | * Either the session daemon is not responding or the relayd died so we | |
432 | * stop now. | |
433 | */ | |
434 | goto error; | |
435 | } | |
436 | ||
437 | /* Send channel to sessiond. */ | |
438 | ret = ustctl_send_channel_to_sessiond(sock, channel->uchan); | |
439 | if (ret < 0) { | |
440 | goto error; | |
441 | } | |
442 | ||
443 | ret = ustctl_channel_close_wakeup_fd(channel->uchan); | |
444 | if (ret < 0) { | |
445 | goto error; | |
446 | } | |
447 | ||
448 | /* The channel was sent successfully to the sessiond at this point. */ | |
449 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
ffe60014 DG |
450 | /* Send stream to session daemon. */ |
451 | ret = send_sessiond_stream(sock, stream); | |
452 | if (ret < 0) { | |
453 | goto error; | |
454 | } | |
455 | } | |
456 | ||
457 | /* Tell sessiond there is no more stream. */ | |
458 | ret = ustctl_send_stream_to_sessiond(sock, NULL); | |
459 | if (ret < 0) { | |
460 | goto error; | |
461 | } | |
462 | ||
463 | DBG("UST consumer NULL stream sent to sessiond"); | |
464 | ||
465 | return 0; | |
466 | ||
467 | error: | |
f2a444f1 DG |
468 | if (ret_code != LTTNG_OK) { |
469 | ret = -1; | |
470 | } | |
ffe60014 DG |
471 | return ret; |
472 | } | |
473 | ||
474 | /* | |
475 | * Creates a channel and streams and add the channel it to the channel internal | |
476 | * state. The created stream must ONLY be sent once the GET_CHANNEL command is | |
477 | * received. | |
478 | * | |
479 | * Return 0 on success or else, a negative value is returned and the channel | |
480 | * MUST be destroyed by consumer_del_channel(). | |
481 | */ | |
482 | static int ask_channel(struct lttng_consumer_local_data *ctx, int sock, | |
483 | struct lttng_consumer_channel *channel, | |
484 | struct ustctl_consumer_channel_attr *attr) | |
3bd1e081 MD |
485 | { |
486 | int ret; | |
487 | ||
ffe60014 DG |
488 | assert(ctx); |
489 | assert(channel); | |
490 | assert(attr); | |
491 | ||
492 | /* | |
493 | * This value is still used by the kernel consumer since for the kernel, | |
494 | * the stream ownership is not IN the consumer so we need to have the | |
495 | * number of left stream that needs to be initialized so we can know when | |
496 | * to delete the channel (see consumer.c). | |
497 | * | |
498 | * As for the user space tracer now, the consumer creates and sends the | |
499 | * stream to the session daemon which only sends them to the application | |
500 | * once every stream of a channel is received making this value useless | |
501 | * because we they will be added to the poll thread before the application | |
502 | * receives them. This ensures that a stream can not hang up during | |
503 | * initilization of a channel. | |
504 | */ | |
505 | channel->nb_init_stream_left = 0; | |
506 | ||
507 | /* The reply msg status is handled in the following call. */ | |
508 | ret = create_ust_channel(attr, &channel->uchan); | |
509 | if (ret < 0) { | |
10a50311 | 510 | goto end; |
3bd1e081 MD |
511 | } |
512 | ||
d8ef542d MD |
513 | channel->wait_fd = ustctl_channel_get_wait_fd(channel->uchan); |
514 | ||
10a50311 JD |
515 | /* |
516 | * For the snapshots (no monitor), we create the metadata streams | |
517 | * on demand, not during the channel creation. | |
518 | */ | |
519 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && !channel->monitor) { | |
520 | ret = 0; | |
521 | goto end; | |
522 | } | |
523 | ||
ffe60014 DG |
524 | /* Open all streams for this channel. */ |
525 | ret = create_ust_streams(channel, ctx); | |
526 | if (ret < 0) { | |
10a50311 | 527 | goto end; |
ffe60014 DG |
528 | } |
529 | ||
10a50311 | 530 | end: |
3bd1e081 MD |
531 | return ret; |
532 | } | |
533 | ||
d88aee68 DG |
534 | /* |
535 | * Send all stream of a channel to the right thread handling it. | |
536 | * | |
537 | * On error, return a negative value else 0 on success. | |
538 | */ | |
539 | static int send_streams_to_thread(struct lttng_consumer_channel *channel, | |
540 | struct lttng_consumer_local_data *ctx) | |
541 | { | |
542 | int ret = 0; | |
543 | struct lttng_consumer_stream *stream, *stmp; | |
544 | ||
545 | assert(channel); | |
546 | assert(ctx); | |
547 | ||
548 | /* Send streams to the corresponding thread. */ | |
549 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
550 | send_node) { | |
551 | /* Sending the stream to the thread. */ | |
552 | ret = send_stream_to_thread(stream, ctx); | |
553 | if (ret < 0) { | |
554 | /* | |
555 | * If we are unable to send the stream to the thread, there is | |
556 | * a big problem so just stop everything. | |
557 | */ | |
558 | goto error; | |
559 | } | |
560 | ||
561 | /* Remove node from the channel stream list. */ | |
562 | cds_list_del(&stream->send_node); | |
4891ece8 DG |
563 | |
564 | /* | |
565 | * From this point on, the stream's ownership has been moved away from | |
566 | * the channel and becomes globally visible. | |
567 | */ | |
568 | stream->globally_visible = 1; | |
d88aee68 DG |
569 | } |
570 | ||
571 | error: | |
572 | return ret; | |
573 | } | |
574 | ||
575 | /* | |
576 | * Write metadata to the given channel using ustctl to convert the string to | |
577 | * the ringbuffer. | |
331744e3 JD |
578 | * Called only from consumer_metadata_cache_write. |
579 | * The metadata cache lock MUST be acquired to write in the cache. | |
d88aee68 DG |
580 | * |
581 | * Return 0 on success else a negative value. | |
582 | */ | |
331744e3 | 583 | int lttng_ustconsumer_push_metadata(struct lttng_consumer_channel *metadata, |
d88aee68 DG |
584 | const char *metadata_str, uint64_t target_offset, uint64_t len) |
585 | { | |
586 | int ret; | |
587 | ||
588 | assert(metadata); | |
589 | assert(metadata_str); | |
590 | ||
591 | DBG("UST consumer writing metadata to channel %s", metadata->name); | |
592 | ||
73811ecc DG |
593 | if (!metadata->metadata_stream) { |
594 | ret = 0; | |
595 | goto error; | |
596 | } | |
597 | ||
331744e3 JD |
598 | assert(target_offset <= metadata->metadata_cache->max_offset); |
599 | ret = ustctl_write_metadata_to_channel(metadata->uchan, | |
600 | metadata_str + target_offset, len); | |
d88aee68 | 601 | if (ret < 0) { |
8fd623e0 | 602 | ERR("ustctl write metadata fail with ret %d, len %" PRIu64, ret, len); |
d88aee68 DG |
603 | goto error; |
604 | } | |
d88aee68 DG |
605 | |
606 | ustctl_flush_buffer(metadata->metadata_stream->ustream, 1); | |
607 | ||
608 | error: | |
609 | return ret; | |
610 | } | |
611 | ||
7972aab2 DG |
612 | /* |
613 | * Flush channel's streams using the given key to retrieve the channel. | |
614 | * | |
615 | * Return 0 on success else an LTTng error code. | |
616 | */ | |
617 | static int flush_channel(uint64_t chan_key) | |
618 | { | |
619 | int ret = 0; | |
620 | struct lttng_consumer_channel *channel; | |
621 | struct lttng_consumer_stream *stream; | |
622 | struct lttng_ht *ht; | |
623 | struct lttng_ht_iter iter; | |
624 | ||
8fd623e0 | 625 | DBG("UST consumer flush channel key %" PRIu64, chan_key); |
7972aab2 | 626 | |
a500c257 | 627 | rcu_read_lock(); |
7972aab2 DG |
628 | channel = consumer_find_channel(chan_key); |
629 | if (!channel) { | |
8fd623e0 | 630 | ERR("UST consumer flush channel %" PRIu64 " not found", chan_key); |
7972aab2 DG |
631 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
632 | goto error; | |
633 | } | |
634 | ||
635 | ht = consumer_data.stream_per_chan_id_ht; | |
636 | ||
637 | /* For each stream of the channel id, flush it. */ | |
7972aab2 DG |
638 | cds_lfht_for_each_entry_duplicate(ht->ht, |
639 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
640 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
641 | ustctl_flush_buffer(stream->ustream, 1); | |
642 | } | |
7972aab2 | 643 | error: |
a500c257 | 644 | rcu_read_unlock(); |
7972aab2 DG |
645 | return ret; |
646 | } | |
647 | ||
d88aee68 DG |
648 | /* |
649 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. | |
a500c257 | 650 | * RCU read side lock MUST be acquired before calling this function. |
d88aee68 DG |
651 | * |
652 | * Return 0 on success else an LTTng error code. | |
653 | */ | |
654 | static int close_metadata(uint64_t chan_key) | |
655 | { | |
ea88ca2a | 656 | int ret = 0; |
d88aee68 DG |
657 | struct lttng_consumer_channel *channel; |
658 | ||
8fd623e0 | 659 | DBG("UST consumer close metadata key %" PRIu64, chan_key); |
d88aee68 DG |
660 | |
661 | channel = consumer_find_channel(chan_key); | |
662 | if (!channel) { | |
84cc9aa0 DG |
663 | /* |
664 | * This is possible if the metadata thread has issue a delete because | |
665 | * the endpoint point of the stream hung up. There is no way the | |
666 | * session daemon can know about it thus use a DBG instead of an actual | |
667 | * error. | |
668 | */ | |
669 | DBG("UST consumer close metadata %" PRIu64 " not found", chan_key); | |
d88aee68 DG |
670 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
671 | goto error; | |
672 | } | |
673 | ||
ea88ca2a | 674 | pthread_mutex_lock(&consumer_data.lock); |
73811ecc DG |
675 | |
676 | if (cds_lfht_is_node_deleted(&channel->node.node)) { | |
677 | goto error_unlock; | |
678 | } | |
679 | ||
680 | if (channel->switch_timer_enabled == 1) { | |
681 | DBG("Deleting timer on metadata channel"); | |
682 | consumer_timer_switch_stop(channel); | |
683 | } | |
684 | ||
685 | if (channel->metadata_stream) { | |
ea88ca2a MD |
686 | ret = ustctl_stream_close_wakeup_fd(channel->metadata_stream->ustream); |
687 | if (ret < 0) { | |
688 | ERR("UST consumer unable to close fd of metadata (ret: %d)", ret); | |
689 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
690 | goto error_unlock; | |
691 | } | |
331744e3 | 692 | } |
d88aee68 | 693 | |
ea88ca2a MD |
694 | error_unlock: |
695 | pthread_mutex_unlock(&consumer_data.lock); | |
d88aee68 DG |
696 | error: |
697 | return ret; | |
698 | } | |
699 | ||
700 | /* | |
701 | * RCU read side lock MUST be acquired before calling this function. | |
702 | * | |
703 | * Return 0 on success else an LTTng error code. | |
704 | */ | |
705 | static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key) | |
706 | { | |
707 | int ret; | |
708 | struct lttng_consumer_channel *metadata; | |
709 | ||
8fd623e0 | 710 | DBG("UST consumer setup metadata key %" PRIu64, key); |
d88aee68 DG |
711 | |
712 | metadata = consumer_find_channel(key); | |
713 | if (!metadata) { | |
714 | ERR("UST consumer push metadata %" PRIu64 " not found", key); | |
715 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
10a50311 JD |
716 | goto end; |
717 | } | |
718 | ||
719 | /* | |
720 | * In no monitor mode, the metadata channel has no stream(s) so skip the | |
721 | * ownership transfer to the metadata thread. | |
722 | */ | |
723 | if (!metadata->monitor) { | |
724 | DBG("Metadata channel in no monitor"); | |
725 | ret = 0; | |
726 | goto end; | |
d88aee68 DG |
727 | } |
728 | ||
729 | /* | |
730 | * Send metadata stream to relayd if one available. Availability is | |
731 | * known if the stream is still in the list of the channel. | |
732 | */ | |
733 | if (cds_list_empty(&metadata->streams.head)) { | |
734 | ERR("Metadata channel key %" PRIu64 ", no stream available.", key); | |
735 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
f5a0c9cf | 736 | goto error_no_stream; |
d88aee68 DG |
737 | } |
738 | ||
739 | /* Send metadata stream to relayd if needed. */ | |
740 | ret = send_stream_to_relayd(metadata->metadata_stream); | |
741 | if (ret < 0) { | |
742 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
743 | goto error; | |
744 | } | |
745 | ||
746 | ret = send_streams_to_thread(metadata, ctx); | |
747 | if (ret < 0) { | |
748 | /* | |
749 | * If we are unable to send the stream to the thread, there is | |
750 | * a big problem so just stop everything. | |
751 | */ | |
752 | ret = LTTCOMM_CONSUMERD_FATAL; | |
753 | goto error; | |
754 | } | |
755 | /* List MUST be empty after or else it could be reused. */ | |
756 | assert(cds_list_empty(&metadata->streams.head)); | |
757 | ||
10a50311 JD |
758 | ret = 0; |
759 | goto end; | |
d88aee68 DG |
760 | |
761 | error: | |
f2a444f1 DG |
762 | /* |
763 | * Delete metadata channel on error. At this point, the metadata stream can | |
764 | * NOT be monitored by the metadata thread thus having the guarantee that | |
765 | * the stream is still in the local stream list of the channel. This call | |
766 | * will make sure to clean that list. | |
767 | */ | |
f5a0c9cf DG |
768 | cds_list_del(&metadata->metadata_stream->send_node); |
769 | consumer_stream_destroy(metadata->metadata_stream, NULL); | |
770 | error_no_stream: | |
10a50311 JD |
771 | end: |
772 | return ret; | |
773 | } | |
774 | ||
775 | /* | |
776 | * Snapshot the whole metadata. | |
777 | * | |
778 | * Returns 0 on success, < 0 on error | |
779 | */ | |
780 | static int snapshot_metadata(uint64_t key, char *path, uint64_t relayd_id, | |
781 | struct lttng_consumer_local_data *ctx) | |
782 | { | |
783 | int ret = 0; | |
784 | ssize_t write_len; | |
785 | uint64_t total_len = 0; | |
786 | struct lttng_consumer_channel *metadata_channel; | |
787 | struct lttng_consumer_stream *metadata_stream; | |
788 | ||
789 | assert(path); | |
790 | assert(ctx); | |
791 | ||
792 | DBG("UST consumer snapshot metadata with key %" PRIu64 " at path %s", | |
793 | key, path); | |
794 | ||
795 | rcu_read_lock(); | |
796 | ||
797 | metadata_channel = consumer_find_channel(key); | |
798 | if (!metadata_channel) { | |
799 | ERR("UST snapshot metadata channel not found for key %lu", key); | |
800 | ret = -1; | |
801 | goto error; | |
802 | } | |
803 | assert(!metadata_channel->monitor); | |
804 | ||
805 | /* | |
806 | * Ask the sessiond if we have new metadata waiting and update the | |
807 | * consumer metadata cache. | |
808 | */ | |
809 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel); | |
810 | if (ret < 0) { | |
811 | goto error; | |
812 | } | |
813 | ||
814 | /* | |
815 | * The metadata stream is NOT created in no monitor mode when the channel | |
816 | * is created on a sessiond ask channel command. | |
817 | */ | |
818 | ret = create_ust_streams(metadata_channel, ctx); | |
819 | if (ret < 0) { | |
820 | goto error; | |
821 | } | |
822 | ||
823 | metadata_stream = metadata_channel->metadata_stream; | |
824 | assert(metadata_stream); | |
825 | ||
826 | if (relayd_id != (uint64_t) -1ULL) { | |
827 | metadata_stream->net_seq_idx = relayd_id; | |
828 | ret = consumer_send_relayd_stream(metadata_stream, path); | |
829 | if (ret < 0) { | |
830 | goto error_stream; | |
831 | } | |
832 | } else { | |
833 | ret = utils_create_stream_file(path, metadata_stream->name, | |
834 | metadata_stream->chan->tracefile_size, | |
835 | metadata_stream->tracefile_count_current, | |
836 | metadata_stream->uid, metadata_stream->gid); | |
837 | if (ret < 0) { | |
838 | goto error_stream; | |
839 | } | |
840 | metadata_stream->out_fd = ret; | |
841 | metadata_stream->tracefile_size_current = 0; | |
842 | } | |
843 | ||
844 | pthread_mutex_lock(&metadata_channel->metadata_cache->lock); | |
845 | while (total_len < metadata_channel->metadata_cache->total_bytes_written) { | |
846 | /* | |
847 | * Write at most one packet of metadata into the channel | |
848 | * to avoid blocking here. | |
849 | */ | |
850 | write_len = ustctl_write_one_packet_to_channel(metadata_channel->uchan, | |
851 | metadata_channel->metadata_cache->data, | |
852 | metadata_channel->metadata_cache->total_bytes_written); | |
853 | if (write_len < 0) { | |
854 | ERR("UST consumer snapshot writing metadata packet"); | |
855 | ret = -1; | |
856 | goto error_unlock; | |
857 | } | |
858 | total_len += write_len; | |
859 | ||
860 | DBG("Written %" PRIu64 " bytes to metadata (left: %" PRIu64 ")", | |
861 | write_len, | |
862 | metadata_channel->metadata_cache->total_bytes_written - write_len); | |
863 | ustctl_flush_buffer(metadata_stream->ustream, 1); | |
864 | ret = lttng_consumer_read_subbuffer(metadata_stream, ctx); | |
865 | if (ret < 0) { | |
866 | goto error_unlock; | |
867 | } | |
868 | } | |
869 | ||
870 | error_unlock: | |
871 | pthread_mutex_unlock(&metadata_channel->metadata_cache->lock); | |
872 | ||
873 | error_stream: | |
874 | /* | |
875 | * Clean up the stream completly because the next snapshot will use a new | |
876 | * metadata stream. | |
877 | */ | |
878 | cds_list_del(&metadata_stream->send_node); | |
879 | consumer_stream_destroy(metadata_stream, NULL); | |
880 | metadata_channel->metadata_stream = NULL; | |
881 | ||
882 | error: | |
883 | rcu_read_unlock(); | |
884 | return ret; | |
885 | } | |
886 | ||
887 | /* | |
888 | * Take a snapshot of all the stream of a channel. | |
889 | * | |
890 | * Returns 0 on success, < 0 on error | |
891 | */ | |
892 | static int snapshot_channel(uint64_t key, char *path, uint64_t relayd_id, | |
893 | struct lttng_consumer_local_data *ctx) | |
894 | { | |
895 | int ret; | |
896 | unsigned use_relayd = 0; | |
897 | unsigned long consumed_pos, produced_pos; | |
898 | struct lttng_consumer_channel *channel; | |
899 | struct lttng_consumer_stream *stream; | |
900 | ||
901 | assert(path); | |
902 | assert(ctx); | |
903 | ||
904 | rcu_read_lock(); | |
905 | ||
906 | if (relayd_id != (uint64_t) -1ULL) { | |
907 | use_relayd = 1; | |
908 | } | |
909 | ||
910 | channel = consumer_find_channel(key); | |
911 | if (!channel) { | |
912 | ERR("UST snapshot channel not found for key %lu", key); | |
913 | ret = -1; | |
914 | goto error; | |
915 | } | |
916 | assert(!channel->monitor); | |
917 | DBG("UST consumer snapshot channel %lu", key); | |
918 | ||
919 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
920 | /* Lock stream because we are about to change its state. */ | |
921 | pthread_mutex_lock(&stream->lock); | |
922 | stream->net_seq_idx = relayd_id; | |
923 | ||
924 | if (use_relayd) { | |
925 | ret = consumer_send_relayd_stream(stream, path); | |
926 | if (ret < 0) { | |
927 | goto error_unlock; | |
928 | } | |
929 | } else { | |
930 | ret = utils_create_stream_file(path, stream->name, | |
931 | stream->chan->tracefile_size, | |
932 | stream->tracefile_count_current, | |
933 | stream->uid, stream->gid); | |
934 | if (ret < 0) { | |
935 | goto error_unlock; | |
936 | } | |
937 | stream->out_fd = ret; | |
938 | stream->tracefile_size_current = 0; | |
939 | ||
940 | DBG("UST consumer snapshot stream %s/%s (%" PRIu64 ")", path, | |
941 | stream->name, stream->key); | |
942 | } | |
943 | ||
944 | ustctl_flush_buffer(stream->ustream, 1); | |
945 | ||
946 | ret = lttng_ustconsumer_take_snapshot(stream); | |
947 | if (ret < 0) { | |
948 | ERR("Taking UST snapshot"); | |
949 | goto error_unlock; | |
950 | } | |
951 | ||
952 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); | |
953 | if (ret < 0) { | |
954 | ERR("Produced UST snapshot position"); | |
955 | goto error_unlock; | |
956 | } | |
957 | ||
958 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
959 | if (ret < 0) { | |
960 | ERR("Consumerd UST snapshot position"); | |
961 | goto error_unlock; | |
962 | } | |
963 | ||
964 | while (consumed_pos < produced_pos) { | |
965 | ssize_t read_len; | |
966 | unsigned long len, padded_len; | |
967 | ||
968 | DBG("UST consumer taking snapshot at pos %lu", consumed_pos); | |
969 | ||
970 | ret = ustctl_get_subbuf(stream->ustream, &consumed_pos); | |
971 | if (ret < 0) { | |
972 | if (ret != -EAGAIN) { | |
973 | PERROR("ustctl_get_subbuf snapshot"); | |
974 | goto error_close_stream; | |
975 | } | |
976 | DBG("UST consumer get subbuf failed. Skipping it."); | |
977 | consumed_pos += stream->max_sb_size; | |
978 | continue; | |
979 | } | |
980 | ||
981 | ret = ustctl_get_subbuf_size(stream->ustream, &len); | |
982 | if (ret < 0) { | |
983 | ERR("Snapshot ustctl_get_subbuf_size"); | |
984 | goto error_put_subbuf; | |
985 | } | |
986 | ||
987 | ret = ustctl_get_padded_subbuf_size(stream->ustream, &padded_len); | |
988 | if (ret < 0) { | |
989 | ERR("Snapshot ustctl_get_padded_subbuf_size"); | |
990 | goto error_put_subbuf; | |
991 | } | |
992 | ||
993 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
994 | padded_len - len); | |
995 | if (use_relayd) { | |
996 | if (read_len != len) { | |
997 | ret = -1; | |
998 | goto error_put_subbuf; | |
999 | } | |
1000 | } else { | |
1001 | if (read_len != padded_len) { | |
1002 | ret = -1; | |
1003 | goto error_put_subbuf; | |
1004 | } | |
1005 | } | |
1006 | ||
1007 | ret = ustctl_put_subbuf(stream->ustream); | |
1008 | if (ret < 0) { | |
1009 | ERR("Snapshot ustctl_put_subbuf"); | |
1010 | goto error_close_stream; | |
1011 | } | |
1012 | consumed_pos += stream->max_sb_size; | |
1013 | } | |
1014 | ||
1015 | /* Simply close the stream so we can use it on the next snapshot. */ | |
1016 | consumer_stream_close(stream); | |
1017 | pthread_mutex_unlock(&stream->lock); | |
1018 | } | |
1019 | ||
1020 | rcu_read_unlock(); | |
1021 | return 0; | |
1022 | ||
1023 | error_put_subbuf: | |
1024 | if (ustctl_put_subbuf(stream->ustream) < 0) { | |
1025 | ERR("Snapshot ustctl_put_subbuf"); | |
1026 | } | |
1027 | error_close_stream: | |
1028 | consumer_stream_close(stream); | |
1029 | error_unlock: | |
1030 | pthread_mutex_unlock(&stream->lock); | |
1031 | error: | |
1032 | rcu_read_unlock(); | |
d88aee68 DG |
1033 | return ret; |
1034 | } | |
1035 | ||
331744e3 JD |
1036 | /* |
1037 | * Receive the metadata updates from the sessiond. | |
1038 | */ | |
1039 | int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset, | |
1040 | uint64_t len, struct lttng_consumer_channel *channel) | |
1041 | { | |
1042 | int ret, ret_code = LTTNG_OK; | |
1043 | char *metadata_str; | |
1044 | ||
8fd623e0 | 1045 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len); |
331744e3 JD |
1046 | |
1047 | metadata_str = zmalloc(len * sizeof(char)); | |
1048 | if (!metadata_str) { | |
1049 | PERROR("zmalloc metadata string"); | |
1050 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; | |
1051 | goto end; | |
1052 | } | |
1053 | ||
1054 | /* Receive metadata string. */ | |
1055 | ret = lttcomm_recv_unix_sock(sock, metadata_str, len); | |
1056 | if (ret < 0) { | |
1057 | /* Session daemon is dead so return gracefully. */ | |
1058 | ret_code = ret; | |
1059 | goto end_free; | |
1060 | } | |
1061 | ||
73811ecc DG |
1062 | /* |
1063 | * XXX: The consumer data lock is acquired before calling metadata cache | |
1064 | * write which calls push metadata that MUST be protected by the consumer | |
1065 | * lock in order to be able to check the validity of the metadata stream of | |
1066 | * the channel. | |
1067 | * | |
1068 | * Note that this will be subject to change to better fine grained locking | |
1069 | * and ultimately try to get rid of this global consumer data lock. | |
1070 | */ | |
1071 | pthread_mutex_lock(&consumer_data.lock); | |
1072 | ||
331744e3 JD |
1073 | pthread_mutex_lock(&channel->metadata_cache->lock); |
1074 | ret = consumer_metadata_cache_write(channel, offset, len, metadata_str); | |
1075 | if (ret < 0) { | |
1076 | /* Unable to handle metadata. Notify session daemon. */ | |
1077 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
a32bd775 DG |
1078 | /* |
1079 | * Skip metadata flush on write error since the offset and len might | |
1080 | * not have been updated which could create an infinite loop below when | |
1081 | * waiting for the metadata cache to be flushed. | |
1082 | */ | |
1083 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
1084 | pthread_mutex_unlock(&consumer_data.lock); | |
1085 | goto end_free; | |
331744e3 JD |
1086 | } |
1087 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
73811ecc | 1088 | pthread_mutex_unlock(&consumer_data.lock); |
331744e3 JD |
1089 | |
1090 | while (consumer_metadata_cache_flushed(channel, offset + len)) { | |
1091 | DBG("Waiting for metadata to be flushed"); | |
1092 | usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME); | |
1093 | } | |
1094 | ||
1095 | end_free: | |
1096 | free(metadata_str); | |
1097 | end: | |
1098 | return ret_code; | |
1099 | } | |
1100 | ||
4cbc1a04 DG |
1101 | /* |
1102 | * Receive command from session daemon and process it. | |
1103 | * | |
1104 | * Return 1 on success else a negative value or 0. | |
1105 | */ | |
3bd1e081 MD |
1106 | int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
1107 | int sock, struct pollfd *consumer_sockpoll) | |
1108 | { | |
1109 | ssize_t ret; | |
f50f23d9 | 1110 | enum lttng_error_code ret_code = LTTNG_OK; |
3bd1e081 | 1111 | struct lttcomm_consumer_msg msg; |
ffe60014 | 1112 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 MD |
1113 | |
1114 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); | |
1115 | if (ret != sizeof(msg)) { | |
173af62f DG |
1116 | DBG("Consumer received unexpected message size %zd (expects %zu)", |
1117 | ret, sizeof(msg)); | |
ffe60014 | 1118 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
3be74084 DG |
1119 | /* |
1120 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
1121 | * since the caller handles this. | |
1122 | */ | |
489f70e9 MD |
1123 | if (ret > 0) { |
1124 | ret = -1; | |
1125 | } | |
3bd1e081 MD |
1126 | return ret; |
1127 | } | |
1128 | if (msg.cmd_type == LTTNG_CONSUMER_STOP) { | |
f50f23d9 DG |
1129 | /* |
1130 | * Notify the session daemon that the command is completed. | |
1131 | * | |
1132 | * On transport layer error, the function call will print an error | |
1133 | * message so handling the returned code is a bit useless since we | |
1134 | * return an error code anyway. | |
1135 | */ | |
1136 | (void) consumer_send_status_msg(sock, ret_code); | |
3bd1e081 MD |
1137 | return -ENOENT; |
1138 | } | |
1139 | ||
3f8e211f | 1140 | /* relayd needs RCU read-side lock */ |
b0b335c8 MD |
1141 | rcu_read_lock(); |
1142 | ||
3bd1e081 | 1143 | switch (msg.cmd_type) { |
00e2e675 DG |
1144 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
1145 | { | |
f50f23d9 | 1146 | /* Session daemon status message are handled in the following call. */ |
7735ef9e DG |
1147 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
1148 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, | |
46e6455f | 1149 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id); |
00e2e675 DG |
1150 | goto end_nosignal; |
1151 | } | |
173af62f DG |
1152 | case LTTNG_CONSUMER_DESTROY_RELAYD: |
1153 | { | |
a6ba4fe1 | 1154 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
173af62f DG |
1155 | struct consumer_relayd_sock_pair *relayd; |
1156 | ||
a6ba4fe1 | 1157 | DBG("UST consumer destroying relayd %" PRIu64, index); |
173af62f DG |
1158 | |
1159 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 1160 | relayd = consumer_find_relayd(index); |
173af62f | 1161 | if (relayd == NULL) { |
3448e266 | 1162 | DBG("Unable to find relayd %" PRIu64, index); |
f50f23d9 | 1163 | ret_code = LTTNG_ERR_NO_CONSUMER; |
173af62f DG |
1164 | } |
1165 | ||
a6ba4fe1 DG |
1166 | /* |
1167 | * Each relayd socket pair has a refcount of stream attached to it | |
1168 | * which tells if the relayd is still active or not depending on the | |
1169 | * refcount value. | |
1170 | * | |
1171 | * This will set the destroy flag of the relayd object and destroy it | |
1172 | * if the refcount reaches zero when called. | |
1173 | * | |
1174 | * The destroy can happen either here or when a stream fd hangs up. | |
1175 | */ | |
f50f23d9 DG |
1176 | if (relayd) { |
1177 | consumer_flag_relayd_for_destroy(relayd); | |
1178 | } | |
1179 | ||
d88aee68 | 1180 | goto end_msg_sessiond; |
173af62f | 1181 | } |
3bd1e081 MD |
1182 | case LTTNG_CONSUMER_UPDATE_STREAM: |
1183 | { | |
3f8e211f | 1184 | rcu_read_unlock(); |
7ad0a0cb | 1185 | return -ENOSYS; |
3bd1e081 | 1186 | } |
6d805429 | 1187 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 1188 | { |
3be74084 | 1189 | int ret, is_data_pending; |
6d805429 | 1190 | uint64_t id = msg.u.data_pending.session_id; |
ca22feea | 1191 | |
6d805429 | 1192 | DBG("UST consumer data pending command for id %" PRIu64, id); |
ca22feea | 1193 | |
3be74084 | 1194 | is_data_pending = consumer_data_pending(id); |
ca22feea DG |
1195 | |
1196 | /* Send back returned value to session daemon */ | |
3be74084 DG |
1197 | ret = lttcomm_send_unix_sock(sock, &is_data_pending, |
1198 | sizeof(is_data_pending)); | |
ca22feea | 1199 | if (ret < 0) { |
3be74084 | 1200 | DBG("Error when sending the data pending ret code: %d", ret); |
489f70e9 | 1201 | goto error_fatal; |
ca22feea | 1202 | } |
f50f23d9 DG |
1203 | |
1204 | /* | |
1205 | * No need to send back a status message since the data pending | |
1206 | * returned value is the response. | |
1207 | */ | |
ca22feea | 1208 | break; |
53632229 | 1209 | } |
ffe60014 DG |
1210 | case LTTNG_CONSUMER_ASK_CHANNEL_CREATION: |
1211 | { | |
1212 | int ret; | |
1213 | struct ustctl_consumer_channel_attr attr; | |
1214 | ||
1215 | /* Create a plain object and reserve a channel key. */ | |
1216 | channel = allocate_channel(msg.u.ask_channel.session_id, | |
1217 | msg.u.ask_channel.pathname, msg.u.ask_channel.name, | |
1218 | msg.u.ask_channel.uid, msg.u.ask_channel.gid, | |
1219 | msg.u.ask_channel.relayd_id, msg.u.ask_channel.key, | |
1624d5b7 JD |
1220 | (enum lttng_event_output) msg.u.ask_channel.output, |
1221 | msg.u.ask_channel.tracefile_size, | |
2bba9e53 | 1222 | msg.u.ask_channel.tracefile_count, |
1950109e | 1223 | msg.u.ask_channel.session_id_per_pid, |
2bba9e53 | 1224 | msg.u.ask_channel.monitor); |
ffe60014 DG |
1225 | if (!channel) { |
1226 | goto end_channel_error; | |
1227 | } | |
1228 | ||
1229 | /* Build channel attributes from received message. */ | |
1230 | attr.subbuf_size = msg.u.ask_channel.subbuf_size; | |
1231 | attr.num_subbuf = msg.u.ask_channel.num_subbuf; | |
1232 | attr.overwrite = msg.u.ask_channel.overwrite; | |
1233 | attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval; | |
1234 | attr.read_timer_interval = msg.u.ask_channel.read_timer_interval; | |
7972aab2 | 1235 | attr.chan_id = msg.u.ask_channel.chan_id; |
10a50311 | 1236 | attr.output = msg.u.ask_channel.output; |
ffe60014 DG |
1237 | memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid)); |
1238 | ||
ffe60014 DG |
1239 | /* Translate and save channel type. */ |
1240 | switch (msg.u.ask_channel.type) { | |
1241 | case LTTNG_UST_CHAN_PER_CPU: | |
1242 | channel->type = CONSUMER_CHANNEL_TYPE_DATA; | |
1243 | attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8633d6e3 MD |
1244 | /* |
1245 | * Set refcount to 1 for owner. Below, we will | |
1246 | * pass ownership to the | |
1247 | * consumer_thread_channel_poll() thread. | |
1248 | */ | |
1249 | channel->refcount = 1; | |
ffe60014 DG |
1250 | break; |
1251 | case LTTNG_UST_CHAN_METADATA: | |
1252 | channel->type = CONSUMER_CHANNEL_TYPE_METADATA; | |
1253 | attr.type = LTTNG_UST_CHAN_METADATA; | |
1254 | break; | |
1255 | default: | |
1256 | assert(0); | |
1257 | goto error_fatal; | |
1258 | }; | |
1259 | ||
1260 | ret = ask_channel(ctx, sock, channel, &attr); | |
1261 | if (ret < 0) { | |
1262 | goto end_channel_error; | |
1263 | } | |
1264 | ||
fc643247 MD |
1265 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1266 | ret = consumer_metadata_cache_allocate(channel); | |
1267 | if (ret < 0) { | |
1268 | ERR("Allocating metadata cache"); | |
1269 | goto end_channel_error; | |
1270 | } | |
1271 | consumer_timer_switch_start(channel, attr.switch_timer_interval); | |
1272 | attr.switch_timer_interval = 0; | |
1273 | } | |
1274 | ||
ffe60014 DG |
1275 | /* |
1276 | * Add the channel to the internal state AFTER all streams were created | |
1277 | * and successfully sent to session daemon. This way, all streams must | |
1278 | * be ready before this channel is visible to the threads. | |
fc643247 MD |
1279 | * If add_channel succeeds, ownership of the channel is |
1280 | * passed to consumer_thread_channel_poll(). | |
ffe60014 DG |
1281 | */ |
1282 | ret = add_channel(channel, ctx); | |
1283 | if (ret < 0) { | |
ea88ca2a MD |
1284 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1285 | if (channel->switch_timer_enabled == 1) { | |
1286 | consumer_timer_switch_stop(channel); | |
1287 | } | |
1288 | consumer_metadata_cache_destroy(channel); | |
1289 | } | |
ffe60014 DG |
1290 | goto end_channel_error; |
1291 | } | |
1292 | ||
1293 | /* | |
1294 | * Channel and streams are now created. Inform the session daemon that | |
1295 | * everything went well and should wait to receive the channel and | |
1296 | * streams with ustctl API. | |
1297 | */ | |
1298 | ret = consumer_send_status_channel(sock, channel); | |
1299 | if (ret < 0) { | |
1300 | /* | |
489f70e9 | 1301 | * There is probably a problem on the socket. |
ffe60014 | 1302 | */ |
489f70e9 | 1303 | goto error_fatal; |
ffe60014 DG |
1304 | } |
1305 | ||
1306 | break; | |
1307 | } | |
1308 | case LTTNG_CONSUMER_GET_CHANNEL: | |
1309 | { | |
1310 | int ret, relayd_err = 0; | |
d88aee68 | 1311 | uint64_t key = msg.u.get_channel.key; |
ffe60014 | 1312 | struct lttng_consumer_channel *channel; |
ffe60014 DG |
1313 | |
1314 | channel = consumer_find_channel(key); | |
1315 | if (!channel) { | |
8fd623e0 | 1316 | ERR("UST consumer get channel key %" PRIu64 " not found", key); |
ffe60014 DG |
1317 | ret_code = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
1318 | goto end_msg_sessiond; | |
1319 | } | |
1320 | ||
ffe60014 DG |
1321 | /* Send everything to sessiond. */ |
1322 | ret = send_sessiond_channel(sock, channel, ctx, &relayd_err); | |
1323 | if (ret < 0) { | |
1324 | if (relayd_err) { | |
1325 | /* | |
1326 | * We were unable to send to the relayd the stream so avoid | |
1327 | * sending back a fatal error to the thread since this is OK | |
f2a444f1 DG |
1328 | * and the consumer can continue its work. The above call |
1329 | * has sent the error status message to the sessiond. | |
ffe60014 | 1330 | */ |
f2a444f1 | 1331 | goto end_nosignal; |
ffe60014 DG |
1332 | } |
1333 | /* | |
1334 | * The communicaton was broken hence there is a bad state between | |
1335 | * the consumer and sessiond so stop everything. | |
1336 | */ | |
1337 | goto error_fatal; | |
1338 | } | |
1339 | ||
10a50311 JD |
1340 | /* |
1341 | * In no monitor mode, the streams ownership is kept inside the channel | |
1342 | * so don't send them to the data thread. | |
1343 | */ | |
1344 | if (!channel->monitor) { | |
1345 | goto end_msg_sessiond; | |
1346 | } | |
1347 | ||
d88aee68 DG |
1348 | ret = send_streams_to_thread(channel, ctx); |
1349 | if (ret < 0) { | |
1350 | /* | |
1351 | * If we are unable to send the stream to the thread, there is | |
1352 | * a big problem so just stop everything. | |
1353 | */ | |
1354 | goto error_fatal; | |
ffe60014 | 1355 | } |
ffe60014 DG |
1356 | /* List MUST be empty after or else it could be reused. */ |
1357 | assert(cds_list_empty(&channel->streams.head)); | |
d88aee68 DG |
1358 | goto end_msg_sessiond; |
1359 | } | |
1360 | case LTTNG_CONSUMER_DESTROY_CHANNEL: | |
1361 | { | |
1362 | uint64_t key = msg.u.destroy_channel.key; | |
d88aee68 | 1363 | |
a0cbdd2e MD |
1364 | /* |
1365 | * Only called if streams have not been sent to stream | |
1366 | * manager thread. However, channel has been sent to | |
1367 | * channel manager thread. | |
1368 | */ | |
1369 | notify_thread_del_channel(ctx, key); | |
d88aee68 | 1370 | goto end_msg_sessiond; |
ffe60014 | 1371 | } |
d88aee68 DG |
1372 | case LTTNG_CONSUMER_CLOSE_METADATA: |
1373 | { | |
1374 | int ret; | |
1375 | ||
1376 | ret = close_metadata(msg.u.close_metadata.key); | |
1377 | if (ret != 0) { | |
1378 | ret_code = ret; | |
1379 | } | |
1380 | ||
1381 | goto end_msg_sessiond; | |
1382 | } | |
7972aab2 DG |
1383 | case LTTNG_CONSUMER_FLUSH_CHANNEL: |
1384 | { | |
1385 | int ret; | |
1386 | ||
1387 | ret = flush_channel(msg.u.flush_channel.key); | |
1388 | if (ret != 0) { | |
1389 | ret_code = ret; | |
1390 | } | |
1391 | ||
1392 | goto end_msg_sessiond; | |
1393 | } | |
d88aee68 | 1394 | case LTTNG_CONSUMER_PUSH_METADATA: |
ffe60014 DG |
1395 | { |
1396 | int ret; | |
d88aee68 | 1397 | uint64_t len = msg.u.push_metadata.len; |
d88aee68 | 1398 | uint64_t key = msg.u.push_metadata.key; |
331744e3 | 1399 | uint64_t offset = msg.u.push_metadata.target_offset; |
ffe60014 DG |
1400 | struct lttng_consumer_channel *channel; |
1401 | ||
8fd623e0 DG |
1402 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, |
1403 | len); | |
ffe60014 DG |
1404 | |
1405 | channel = consumer_find_channel(key); | |
1406 | if (!channel) { | |
8fd623e0 | 1407 | ERR("UST consumer push metadata %" PRIu64 " not found", key); |
ffe60014 | 1408 | ret_code = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
4a2eb0ca | 1409 | goto end_msg_sessiond; |
d88aee68 DG |
1410 | } |
1411 | ||
1412 | /* Tell session daemon we are ready to receive the metadata. */ | |
ffe60014 DG |
1413 | ret = consumer_send_status_msg(sock, LTTNG_OK); |
1414 | if (ret < 0) { | |
1415 | /* Somehow, the session daemon is not responding anymore. */ | |
d88aee68 DG |
1416 | goto error_fatal; |
1417 | } | |
1418 | ||
1419 | /* Wait for more data. */ | |
1420 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
489f70e9 | 1421 | goto error_fatal; |
d88aee68 DG |
1422 | } |
1423 | ||
331744e3 JD |
1424 | ret = lttng_ustconsumer_recv_metadata(sock, key, offset, |
1425 | len, channel); | |
d88aee68 | 1426 | if (ret < 0) { |
331744e3 | 1427 | /* error receiving from sessiond */ |
489f70e9 | 1428 | goto error_fatal; |
331744e3 JD |
1429 | } else { |
1430 | ret_code = ret; | |
d88aee68 DG |
1431 | goto end_msg_sessiond; |
1432 | } | |
d88aee68 DG |
1433 | } |
1434 | case LTTNG_CONSUMER_SETUP_METADATA: | |
1435 | { | |
1436 | int ret; | |
1437 | ||
1438 | ret = setup_metadata(ctx, msg.u.setup_metadata.key); | |
1439 | if (ret) { | |
1440 | ret_code = ret; | |
1441 | } | |
1442 | goto end_msg_sessiond; | |
ffe60014 | 1443 | } |
6dc3064a DG |
1444 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
1445 | { | |
10a50311 JD |
1446 | if (msg.u.snapshot_channel.metadata) { |
1447 | ret = snapshot_metadata(msg.u.snapshot_channel.key, | |
1448 | msg.u.snapshot_channel.pathname, | |
1449 | msg.u.snapshot_channel.relayd_id, | |
1450 | ctx); | |
1451 | if (ret < 0) { | |
1452 | ERR("Snapshot metadata failed"); | |
1453 | ret_code = LTTNG_ERR_UST_META_FAIL; | |
1454 | } | |
1455 | } else { | |
1456 | ret = snapshot_channel(msg.u.snapshot_channel.key, | |
1457 | msg.u.snapshot_channel.pathname, | |
1458 | msg.u.snapshot_channel.relayd_id, | |
1459 | ctx); | |
1460 | if (ret < 0) { | |
1461 | ERR("Snapshot channel failed"); | |
1462 | ret_code = LTTNG_ERR_UST_CHAN_FAIL; | |
1463 | } | |
1464 | } | |
1465 | ||
6dc3064a DG |
1466 | ret = consumer_send_status_msg(sock, ret_code); |
1467 | if (ret < 0) { | |
1468 | /* Somehow, the session daemon is not responding anymore. */ | |
1469 | goto end_nosignal; | |
1470 | } | |
1471 | break; | |
1472 | } | |
3bd1e081 MD |
1473 | default: |
1474 | break; | |
1475 | } | |
3f8e211f | 1476 | |
3bd1e081 | 1477 | end_nosignal: |
b0b335c8 | 1478 | rcu_read_unlock(); |
4cbc1a04 DG |
1479 | |
1480 | /* | |
1481 | * Return 1 to indicate success since the 0 value can be a socket | |
1482 | * shutdown during the recv() or send() call. | |
1483 | */ | |
1484 | return 1; | |
ffe60014 DG |
1485 | |
1486 | end_msg_sessiond: | |
1487 | /* | |
1488 | * The returned value here is not useful since either way we'll return 1 to | |
1489 | * the caller because the session daemon socket management is done | |
1490 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. | |
1491 | */ | |
489f70e9 MD |
1492 | ret = consumer_send_status_msg(sock, ret_code); |
1493 | if (ret < 0) { | |
1494 | goto error_fatal; | |
1495 | } | |
ffe60014 DG |
1496 | rcu_read_unlock(); |
1497 | return 1; | |
1498 | end_channel_error: | |
1499 | if (channel) { | |
1500 | /* | |
1501 | * Free channel here since no one has a reference to it. We don't | |
1502 | * free after that because a stream can store this pointer. | |
1503 | */ | |
1504 | destroy_channel(channel); | |
1505 | } | |
1506 | /* We have to send a status channel message indicating an error. */ | |
1507 | ret = consumer_send_status_channel(sock, NULL); | |
1508 | if (ret < 0) { | |
1509 | /* Stop everything if session daemon can not be notified. */ | |
1510 | goto error_fatal; | |
1511 | } | |
1512 | rcu_read_unlock(); | |
1513 | return 1; | |
1514 | error_fatal: | |
1515 | rcu_read_unlock(); | |
1516 | /* This will issue a consumer stop. */ | |
1517 | return -1; | |
3bd1e081 MD |
1518 | } |
1519 | ||
ffe60014 DG |
1520 | /* |
1521 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
1522 | * compiled out, we isolate it in this library. | |
1523 | */ | |
1524 | int lttng_ustctl_get_mmap_read_offset(struct lttng_consumer_stream *stream, | |
1525 | unsigned long *off) | |
3bd1e081 | 1526 | { |
ffe60014 DG |
1527 | assert(stream); |
1528 | assert(stream->ustream); | |
b5c5fc29 | 1529 | |
ffe60014 | 1530 | return ustctl_get_mmap_read_offset(stream->ustream, off); |
3bd1e081 MD |
1531 | } |
1532 | ||
ffe60014 DG |
1533 | /* |
1534 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
1535 | * compiled out, we isolate it in this library. | |
1536 | */ | |
1537 | void *lttng_ustctl_get_mmap_base(struct lttng_consumer_stream *stream) | |
d056b477 | 1538 | { |
ffe60014 DG |
1539 | assert(stream); |
1540 | assert(stream->ustream); | |
1541 | ||
1542 | return ustctl_get_mmap_base(stream->ustream); | |
d056b477 MD |
1543 | } |
1544 | ||
ffe60014 DG |
1545 | /* |
1546 | * Take a snapshot for a specific fd | |
1547 | * | |
1548 | * Returns 0 on success, < 0 on error | |
1549 | */ | |
1550 | int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream) | |
3bd1e081 | 1551 | { |
ffe60014 DG |
1552 | assert(stream); |
1553 | assert(stream->ustream); | |
1554 | ||
1555 | return ustctl_snapshot(stream->ustream); | |
3bd1e081 MD |
1556 | } |
1557 | ||
ffe60014 DG |
1558 | /* |
1559 | * Get the produced position | |
1560 | * | |
1561 | * Returns 0 on success, < 0 on error | |
1562 | */ | |
1563 | int lttng_ustconsumer_get_produced_snapshot( | |
1564 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
3bd1e081 | 1565 | { |
ffe60014 DG |
1566 | assert(stream); |
1567 | assert(stream->ustream); | |
1568 | assert(pos); | |
7a57cf92 | 1569 | |
ffe60014 DG |
1570 | return ustctl_snapshot_get_produced(stream->ustream, pos); |
1571 | } | |
7a57cf92 | 1572 | |
10a50311 JD |
1573 | /* |
1574 | * Get the consumed position | |
1575 | * | |
1576 | * Returns 0 on success, < 0 on error | |
1577 | */ | |
1578 | int lttng_ustconsumer_get_consumed_snapshot( | |
1579 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
1580 | { | |
1581 | assert(stream); | |
1582 | assert(stream->ustream); | |
1583 | assert(pos); | |
1584 | ||
1585 | return ustctl_snapshot_get_consumed(stream->ustream, pos); | |
1586 | } | |
1587 | ||
ffe60014 DG |
1588 | /* |
1589 | * Called when the stream signal the consumer that it has hang up. | |
1590 | */ | |
1591 | void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream) | |
1592 | { | |
1593 | assert(stream); | |
1594 | assert(stream->ustream); | |
2c1dd183 | 1595 | |
ffe60014 DG |
1596 | ustctl_flush_buffer(stream->ustream, 0); |
1597 | stream->hangup_flush_done = 1; | |
1598 | } | |
ee77a7b0 | 1599 | |
ffe60014 DG |
1600 | void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan) |
1601 | { | |
1602 | assert(chan); | |
1603 | assert(chan->uchan); | |
e316aad5 | 1604 | |
ea88ca2a MD |
1605 | if (chan->switch_timer_enabled == 1) { |
1606 | consumer_timer_switch_stop(chan); | |
1607 | } | |
1608 | consumer_metadata_cache_destroy(chan); | |
ffe60014 | 1609 | ustctl_destroy_channel(chan->uchan); |
3bd1e081 MD |
1610 | } |
1611 | ||
1612 | void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream) | |
1613 | { | |
ffe60014 DG |
1614 | assert(stream); |
1615 | assert(stream->ustream); | |
d41f73b7 | 1616 | |
ea88ca2a MD |
1617 | if (stream->chan->switch_timer_enabled == 1) { |
1618 | consumer_timer_switch_stop(stream->chan); | |
1619 | } | |
ffe60014 DG |
1620 | ustctl_destroy_stream(stream->ustream); |
1621 | } | |
d41f73b7 MD |
1622 | |
1623 | int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream, | |
1624 | struct lttng_consumer_local_data *ctx) | |
1625 | { | |
1d4dfdef | 1626 | unsigned long len, subbuf_size, padding; |
d41f73b7 MD |
1627 | int err; |
1628 | long ret = 0; | |
d41f73b7 | 1629 | char dummy; |
ffe60014 DG |
1630 | struct ustctl_consumer_stream *ustream; |
1631 | ||
1632 | assert(stream); | |
1633 | assert(stream->ustream); | |
1634 | assert(ctx); | |
d41f73b7 | 1635 | |
ffe60014 DG |
1636 | DBG2("In UST read_subbuffer (wait_fd: %d, name: %s)", stream->wait_fd, |
1637 | stream->name); | |
1638 | ||
1639 | /* Ease our life for what's next. */ | |
1640 | ustream = stream->ustream; | |
d41f73b7 MD |
1641 | |
1642 | /* We can consume the 1 byte written into the wait_fd by UST */ | |
effcf122 | 1643 | if (!stream->hangup_flush_done) { |
c617c0c6 MD |
1644 | ssize_t readlen; |
1645 | ||
effcf122 MD |
1646 | do { |
1647 | readlen = read(stream->wait_fd, &dummy, 1); | |
87dc6a9c | 1648 | } while (readlen == -1 && errno == EINTR); |
effcf122 MD |
1649 | if (readlen == -1) { |
1650 | ret = readlen; | |
1651 | goto end; | |
1652 | } | |
d41f73b7 MD |
1653 | } |
1654 | ||
d41f73b7 | 1655 | /* Get the next subbuffer */ |
ffe60014 | 1656 | err = ustctl_get_next_subbuf(ustream); |
d41f73b7 | 1657 | if (err != 0) { |
1d4dfdef | 1658 | ret = err; /* ustctl_get_next_subbuf returns negative, caller expect positive. */ |
d41f73b7 MD |
1659 | /* |
1660 | * This is a debug message even for single-threaded consumer, | |
1661 | * because poll() have more relaxed criterions than get subbuf, | |
1662 | * so get_subbuf may fail for short race windows where poll() | |
1663 | * would issue wakeups. | |
1664 | */ | |
1665 | DBG("Reserving sub buffer failed (everything is normal, " | |
ffe60014 | 1666 | "it is due to concurrency) [ret: %d]", err); |
d41f73b7 MD |
1667 | goto end; |
1668 | } | |
ffe60014 | 1669 | assert(stream->chan->output == CONSUMER_CHANNEL_MMAP); |
1d4dfdef | 1670 | /* Get the full padded subbuffer size */ |
ffe60014 | 1671 | err = ustctl_get_padded_subbuf_size(ustream, &len); |
effcf122 | 1672 | assert(err == 0); |
1d4dfdef DG |
1673 | |
1674 | /* Get subbuffer data size (without padding) */ | |
ffe60014 | 1675 | err = ustctl_get_subbuf_size(ustream, &subbuf_size); |
1d4dfdef DG |
1676 | assert(err == 0); |
1677 | ||
1678 | /* Make sure we don't get a subbuffer size bigger than the padded */ | |
1679 | assert(len >= subbuf_size); | |
1680 | ||
1681 | padding = len - subbuf_size; | |
d41f73b7 | 1682 | /* write the subbuffer to the tracefile */ |
1d4dfdef | 1683 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, padding); |
91dfef6e DG |
1684 | /* |
1685 | * The mmap operation should write subbuf_size amount of data when network | |
1686 | * streaming or the full padding (len) size when we are _not_ streaming. | |
1687 | */ | |
d88aee68 DG |
1688 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
1689 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
d41f73b7 | 1690 | /* |
91dfef6e | 1691 | * Display the error but continue processing to try to release the |
c5c45efa DG |
1692 | * subbuffer. This is a DBG statement since any unexpected kill or |
1693 | * signal, the application gets unregistered, relayd gets closed or | |
1694 | * anything that affects the buffer lifetime will trigger this error. | |
1695 | * So, for the sake of the user, don't print this error since it can | |
1696 | * happen and it is OK with the code flow. | |
d41f73b7 | 1697 | */ |
c5c45efa | 1698 | DBG("Error writing to tracefile " |
8fd623e0 | 1699 | "(ret: %ld != len: %lu != subbuf_size: %lu)", |
91dfef6e | 1700 | ret, len, subbuf_size); |
d41f73b7 | 1701 | } |
ffe60014 | 1702 | err = ustctl_put_next_subbuf(ustream); |
effcf122 | 1703 | assert(err == 0); |
331744e3 | 1704 | |
d41f73b7 MD |
1705 | end: |
1706 | return ret; | |
1707 | } | |
1708 | ||
ffe60014 DG |
1709 | /* |
1710 | * Called when a stream is created. | |
fe4477ee JD |
1711 | * |
1712 | * Return 0 on success or else a negative value. | |
ffe60014 | 1713 | */ |
d41f73b7 MD |
1714 | int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream) |
1715 | { | |
fe4477ee JD |
1716 | int ret; |
1717 | ||
10a50311 JD |
1718 | assert(stream); |
1719 | ||
fe4477ee | 1720 | /* Don't create anything if this is set for streaming. */ |
10a50311 | 1721 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { |
fe4477ee JD |
1722 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
1723 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
1724 | stream->uid, stream->gid); | |
1725 | if (ret < 0) { | |
1726 | goto error; | |
1727 | } | |
1728 | stream->out_fd = ret; | |
1729 | stream->tracefile_size_current = 0; | |
1730 | } | |
1731 | ret = 0; | |
1732 | ||
1733 | error: | |
1734 | return ret; | |
d41f73b7 | 1735 | } |
ca22feea DG |
1736 | |
1737 | /* | |
1738 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
1739 | * stream. Consumer data lock MUST be acquired before calling this function |
1740 | * and the stream lock. | |
ca22feea | 1741 | * |
6d805429 | 1742 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
1743 | * data is available for trace viewer reading. |
1744 | */ | |
6d805429 | 1745 | int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
1746 | { |
1747 | int ret; | |
1748 | ||
1749 | assert(stream); | |
ffe60014 | 1750 | assert(stream->ustream); |
ca22feea | 1751 | |
6d805429 | 1752 | DBG("UST consumer checking data pending"); |
c8f59ee5 | 1753 | |
ffe60014 | 1754 | ret = ustctl_get_next_subbuf(stream->ustream); |
ca22feea DG |
1755 | if (ret == 0) { |
1756 | /* There is still data so let's put back this subbuffer. */ | |
ffe60014 | 1757 | ret = ustctl_put_subbuf(stream->ustream); |
ca22feea | 1758 | assert(ret == 0); |
6d805429 | 1759 | ret = 1; /* Data is pending */ |
4e9a4686 | 1760 | goto end; |
ca22feea DG |
1761 | } |
1762 | ||
6d805429 DG |
1763 | /* Data is NOT pending so ready to be read. */ |
1764 | ret = 0; | |
ca22feea | 1765 | |
6efae65e DG |
1766 | end: |
1767 | return ret; | |
ca22feea | 1768 | } |
d88aee68 DG |
1769 | |
1770 | /* | |
1771 | * Close every metadata stream wait fd of the metadata hash table. This | |
1772 | * function MUST be used very carefully so not to run into a race between the | |
1773 | * metadata thread handling streams and this function closing their wait fd. | |
1774 | * | |
1775 | * For UST, this is used when the session daemon hangs up. Its the metadata | |
1776 | * producer so calling this is safe because we are assured that no state change | |
1777 | * can occur in the metadata thread for the streams in the hash table. | |
1778 | */ | |
1779 | void lttng_ustconsumer_close_metadata(struct lttng_ht *metadata_ht) | |
1780 | { | |
1781 | int ret; | |
1782 | struct lttng_ht_iter iter; | |
1783 | struct lttng_consumer_stream *stream; | |
1784 | ||
1785 | assert(metadata_ht); | |
1786 | assert(metadata_ht->ht); | |
1787 | ||
1788 | DBG("UST consumer closing all metadata streams"); | |
1789 | ||
1790 | rcu_read_lock(); | |
1791 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, | |
1792 | node.node) { | |
1793 | int fd = stream->wait_fd; | |
1794 | ||
1795 | /* | |
1796 | * Whatever happens here we have to continue to try to close every | |
1797 | * streams. Let's report at least the error on failure. | |
1798 | */ | |
1799 | ret = ustctl_stream_close_wakeup_fd(stream->ustream); | |
1800 | if (ret) { | |
1801 | ERR("Unable to close metadata stream fd %d ret %d", fd, ret); | |
1802 | } | |
1803 | DBG("Metadata wait fd %d closed", fd); | |
1804 | } | |
1805 | rcu_read_unlock(); | |
1806 | } | |
d8ef542d MD |
1807 | |
1808 | void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream) | |
1809 | { | |
1810 | int ret; | |
1811 | ||
1812 | ret = ustctl_stream_close_wakeup_fd(stream->ustream); | |
1813 | if (ret < 0) { | |
1814 | ERR("Unable to close wakeup fd"); | |
1815 | } | |
1816 | } | |
331744e3 JD |
1817 | |
1818 | int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx, | |
1819 | struct lttng_consumer_channel *channel) | |
1820 | { | |
1821 | struct lttcomm_metadata_request_msg request; | |
1822 | struct lttcomm_consumer_msg msg; | |
1823 | enum lttng_error_code ret_code = LTTNG_OK; | |
1824 | uint64_t len, key, offset; | |
1825 | int ret; | |
1826 | ||
1827 | assert(channel); | |
1828 | assert(channel->metadata_cache); | |
1829 | ||
1830 | /* send the metadata request to sessiond */ | |
1831 | switch (consumer_data.type) { | |
1832 | case LTTNG_CONSUMER64_UST: | |
1833 | request.bits_per_long = 64; | |
1834 | break; | |
1835 | case LTTNG_CONSUMER32_UST: | |
1836 | request.bits_per_long = 32; | |
1837 | break; | |
1838 | default: | |
1839 | request.bits_per_long = 0; | |
1840 | break; | |
1841 | } | |
1842 | ||
1843 | request.session_id = channel->session_id; | |
1950109e | 1844 | request.session_id_per_pid = channel->session_id_per_pid; |
331744e3 JD |
1845 | request.uid = channel->uid; |
1846 | request.key = channel->key; | |
1950109e JD |
1847 | DBG("Sending metadata request to sessiond, session id %" PRIu64 |
1848 | ", per-pid %" PRIu64, | |
1849 | channel->session_id, | |
1850 | channel->session_id_per_pid); | |
331744e3 JD |
1851 | |
1852 | ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request, | |
1853 | sizeof(request)); | |
1854 | if (ret < 0) { | |
1855 | ERR("Asking metadata to sessiond"); | |
1856 | goto end; | |
1857 | } | |
1858 | ||
1859 | /* Receive the metadata from sessiond */ | |
1860 | ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg, | |
1861 | sizeof(msg)); | |
1862 | if (ret != sizeof(msg)) { | |
8fd623e0 | 1863 | DBG("Consumer received unexpected message size %d (expects %zu)", |
331744e3 JD |
1864 | ret, sizeof(msg)); |
1865 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); | |
1866 | /* | |
1867 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
1868 | * since the caller handles this. | |
1869 | */ | |
1870 | goto end; | |
1871 | } | |
1872 | ||
1873 | if (msg.cmd_type == LTTNG_ERR_UND) { | |
1874 | /* No registry found */ | |
1875 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, | |
1876 | ret_code); | |
1877 | ret = 0; | |
1878 | goto end; | |
1879 | } else if (msg.cmd_type != LTTNG_CONSUMER_PUSH_METADATA) { | |
1880 | ERR("Unexpected cmd_type received %d", msg.cmd_type); | |
1881 | ret = -1; | |
1882 | goto end; | |
1883 | } | |
1884 | ||
1885 | len = msg.u.push_metadata.len; | |
1886 | key = msg.u.push_metadata.key; | |
1887 | offset = msg.u.push_metadata.target_offset; | |
1888 | ||
1889 | assert(key == channel->key); | |
1890 | if (len == 0) { | |
1891 | DBG("No new metadata to receive for key %" PRIu64, key); | |
1892 | } | |
1893 | ||
1894 | /* Tell session daemon we are ready to receive the metadata. */ | |
1895 | ret = consumer_send_status_msg(ctx->consumer_metadata_socket, | |
1896 | LTTNG_OK); | |
1897 | if (ret < 0 || len == 0) { | |
1898 | /* | |
1899 | * Somehow, the session daemon is not responding anymore or there is | |
1900 | * nothing to receive. | |
1901 | */ | |
1902 | goto end; | |
1903 | } | |
1904 | ||
1905 | ret_code = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket, | |
1906 | key, offset, len, channel); | |
f2a444f1 DG |
1907 | if (ret_code >= 0) { |
1908 | /* | |
1909 | * Only send the status msg if the sessiond is alive meaning a positive | |
1910 | * ret code. | |
1911 | */ | |
1912 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret_code); | |
1913 | } | |
331744e3 JD |
1914 | ret = 0; |
1915 | ||
1916 | end: | |
1917 | return ret; | |
1918 | } |