Fix: int printed as uint
[lttng-tools.git] / src / common / ust-consumer / ust-consumer.c
CommitLineData
3bd1e081
MD
1/*
2 * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
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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
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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 *
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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.
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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>
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47
48#include "ust-consumer.h"
3bd1e081 49
45863397 50#define INT_MAX_STR_LEN 12 /* includes \0 */
4628484a 51
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52extern struct lttng_consumer_global_data consumer_data;
53extern int consumer_poll_timeout;
54extern volatile int consumer_quit;
55
56/*
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57 * Free channel object and all streams associated with it. This MUST be used
58 * only and only if the channel has _NEVER_ been added to the global channel
59 * hash table.
3bd1e081 60 */
ffe60014 61static void destroy_channel(struct lttng_consumer_channel *channel)
3bd1e081 62{
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63 struct lttng_consumer_stream *stream, *stmp;
64
65 assert(channel);
66
67 DBG("UST consumer cleaning stream list");
68
69 cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head,
70 send_node) {
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71
72 health_code_update();
73
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74 cds_list_del(&stream->send_node);
75 ustctl_destroy_stream(stream->ustream);
76 free(stream);
77 }
78
79 /*
80 * If a channel is available meaning that was created before the streams
81 * were, delete it.
82 */
83 if (channel->uchan) {
84 lttng_ustconsumer_del_channel(channel);
b83e03c4 85 lttng_ustconsumer_free_channel(channel);
ffe60014
DG
86 }
87 free(channel);
88}
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89
90/*
ffe60014 91 * Add channel to internal consumer state.
3bd1e081 92 *
ffe60014 93 * Returns 0 on success or else a negative value.
3bd1e081 94 */
ffe60014
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95static int add_channel(struct lttng_consumer_channel *channel,
96 struct lttng_consumer_local_data *ctx)
3bd1e081
MD
97{
98 int ret = 0;
99
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100 assert(channel);
101 assert(ctx);
102
103 if (ctx->on_recv_channel != NULL) {
104 ret = ctx->on_recv_channel(channel);
105 if (ret == 0) {
d8ef542d 106 ret = consumer_add_channel(channel, ctx);
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107 } else if (ret < 0) {
108 /* Most likely an ENOMEM. */
109 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR);
110 goto error;
111 }
112 } else {
d8ef542d 113 ret = consumer_add_channel(channel, ctx);
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114 }
115
d88aee68 116 DBG("UST consumer channel added (key: %" PRIu64 ")", channel->key);
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117
118error:
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119 return ret;
120}
121
122/*
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123 * Allocate and return a consumer channel object.
124 */
125static struct lttng_consumer_channel *allocate_channel(uint64_t session_id,
126 const char *pathname, const char *name, uid_t uid, gid_t gid,
da009f2c 127 uint64_t relayd_id, uint64_t key, enum lttng_event_output output,
2bba9e53 128 uint64_t tracefile_size, uint64_t tracefile_count,
ecc48a90 129 uint64_t session_id_per_pid, unsigned int monitor,
d7ba1388 130 unsigned int live_timer_interval,
3d071855 131 const char *root_shm_path, const char *shm_path)
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132{
133 assert(pathname);
134 assert(name);
135
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136 return consumer_allocate_channel(key, session_id, pathname, name, uid,
137 gid, relayd_id, output, tracefile_size,
d7ba1388 138 tracefile_count, session_id_per_pid, monitor,
3d071855 139 live_timer_interval, root_shm_path, shm_path);
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140}
141
142/*
143 * Allocate and return a consumer stream object. If _alloc_ret is not NULL, the
144 * error value if applicable is set in it else it is kept untouched.
3bd1e081 145 *
ffe60014 146 * Return NULL on error else the newly allocated stream object.
3bd1e081 147 */
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148static struct lttng_consumer_stream *allocate_stream(int cpu, int key,
149 struct lttng_consumer_channel *channel,
150 struct lttng_consumer_local_data *ctx, int *_alloc_ret)
151{
152 int alloc_ret;
153 struct lttng_consumer_stream *stream = NULL;
154
155 assert(channel);
156 assert(ctx);
157
158 stream = consumer_allocate_stream(channel->key,
159 key,
160 LTTNG_CONSUMER_ACTIVE_STREAM,
161 channel->name,
162 channel->uid,
163 channel->gid,
164 channel->relayd_id,
165 channel->session_id,
166 cpu,
167 &alloc_ret,
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168 channel->type,
169 channel->monitor);
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170 if (stream == NULL) {
171 switch (alloc_ret) {
172 case -ENOENT:
173 /*
174 * We could not find the channel. Can happen if cpu hotplug
175 * happens while tearing down.
176 */
177 DBG3("Could not find channel");
178 break;
179 case -ENOMEM:
180 case -EINVAL:
181 default:
182 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR);
183 break;
184 }
185 goto error;
186 }
187
188 stream->chan = channel;
189
190error:
191 if (_alloc_ret) {
192 *_alloc_ret = alloc_ret;
193 }
194 return stream;
195}
196
197/*
198 * Send the given stream pointer to the corresponding thread.
199 *
200 * Returns 0 on success else a negative value.
201 */
202static int send_stream_to_thread(struct lttng_consumer_stream *stream,
203 struct lttng_consumer_local_data *ctx)
204{
dae10966
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205 int ret;
206 struct lttng_pipe *stream_pipe;
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207
208 /* Get the right pipe where the stream will be sent. */
209 if (stream->metadata_flag) {
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210 ret = consumer_add_metadata_stream(stream);
211 if (ret) {
212 ERR("Consumer add metadata stream %" PRIu64 " failed.",
213 stream->key);
214 goto error;
215 }
dae10966 216 stream_pipe = ctx->consumer_metadata_pipe;
ffe60014 217 } else {
5ab66908
MD
218 ret = consumer_add_data_stream(stream);
219 if (ret) {
220 ERR("Consumer add stream %" PRIu64 " failed.",
221 stream->key);
222 goto error;
223 }
dae10966 224 stream_pipe = ctx->consumer_data_pipe;
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225 }
226
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227 /*
228 * From this point on, the stream's ownership has been moved away from
229 * the channel and becomes globally visible.
230 */
231 stream->globally_visible = 1;
232
dae10966 233 ret = lttng_pipe_write(stream_pipe, &stream, sizeof(stream));
ffe60014 234 if (ret < 0) {
dae10966
DG
235 ERR("Consumer write %s stream to pipe %d",
236 stream->metadata_flag ? "metadata" : "data",
237 lttng_pipe_get_writefd(stream_pipe));
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MD
238 if (stream->metadata_flag) {
239 consumer_del_stream_for_metadata(stream);
240 } else {
241 consumer_del_stream_for_data(stream);
242 }
ffe60014 243 }
5ab66908 244error:
ffe60014
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245 return ret;
246}
247
4628484a
MD
248static
249int get_stream_shm_path(char *stream_shm_path, const char *shm_path, int cpu)
250{
45863397 251 char cpu_nr[INT_MAX_STR_LEN]; /* int max len */
4628484a
MD
252 int ret;
253
254 strncpy(stream_shm_path, shm_path, PATH_MAX);
255 stream_shm_path[PATH_MAX - 1] = '\0';
45863397 256 ret = snprintf(cpu_nr, INT_MAX_STR_LEN, "%i", cpu);
67f8cb8d
MD
257 if (ret < 0) {
258 PERROR("snprintf");
4628484a
MD
259 goto end;
260 }
261 strncat(stream_shm_path, cpu_nr,
262 PATH_MAX - strlen(stream_shm_path) - 1);
263 ret = 0;
264end:
265 return ret;
266}
267
d88aee68
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268/*
269 * Create streams for the given channel using liblttng-ust-ctl.
270 *
271 * Return 0 on success else a negative value.
272 */
ffe60014
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273static int create_ust_streams(struct lttng_consumer_channel *channel,
274 struct lttng_consumer_local_data *ctx)
275{
276 int ret, cpu = 0;
277 struct ustctl_consumer_stream *ustream;
278 struct lttng_consumer_stream *stream;
279
280 assert(channel);
281 assert(ctx);
282
283 /*
284 * While a stream is available from ustctl. When NULL is returned, we've
285 * reached the end of the possible stream for the channel.
286 */
287 while ((ustream = ustctl_create_stream(channel->uchan, cpu))) {
288 int wait_fd;
04ef1097 289 int ust_metadata_pipe[2];
ffe60014 290
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MD
291 health_code_update();
292
04ef1097
MD
293 if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && channel->monitor) {
294 ret = utils_create_pipe_cloexec_nonblock(ust_metadata_pipe);
295 if (ret < 0) {
296 ERR("Create ust metadata poll pipe");
297 goto error;
298 }
299 wait_fd = ust_metadata_pipe[0];
300 } else {
301 wait_fd = ustctl_stream_get_wait_fd(ustream);
302 }
ffe60014
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303
304 /* Allocate consumer stream object. */
305 stream = allocate_stream(cpu, wait_fd, channel, ctx, &ret);
306 if (!stream) {
307 goto error_alloc;
308 }
309 stream->ustream = ustream;
310 /*
311 * Store it so we can save multiple function calls afterwards since
312 * this value is used heavily in the stream threads. This is UST
313 * specific so this is why it's done after allocation.
314 */
315 stream->wait_fd = wait_fd;
316
b31398bb
DG
317 /*
318 * Increment channel refcount since the channel reference has now been
319 * assigned in the allocation process above.
320 */
10a50311
JD
321 if (stream->chan->monitor) {
322 uatomic_inc(&stream->chan->refcount);
323 }
b31398bb 324
ffe60014
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325 /*
326 * Order is important this is why a list is used. On error, the caller
327 * should clean this list.
328 */
329 cds_list_add_tail(&stream->send_node, &channel->streams.head);
330
331 ret = ustctl_get_max_subbuf_size(stream->ustream,
332 &stream->max_sb_size);
333 if (ret < 0) {
334 ERR("ustctl_get_max_subbuf_size failed for stream %s",
335 stream->name);
336 goto error;
337 }
338
339 /* Do actions once stream has been received. */
340 if (ctx->on_recv_stream) {
341 ret = ctx->on_recv_stream(stream);
342 if (ret < 0) {
343 goto error;
344 }
345 }
346
d88aee68 347 DBG("UST consumer add stream %s (key: %" PRIu64 ") with relayd id %" PRIu64,
ffe60014
DG
348 stream->name, stream->key, stream->relayd_stream_id);
349
350 /* Set next CPU stream. */
351 channel->streams.count = ++cpu;
d88aee68
DG
352
353 /* Keep stream reference when creating metadata. */
354 if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) {
355 channel->metadata_stream = stream;
8de4f941
JG
356 if (channel->monitor) {
357 /* Set metadata poll pipe if we created one */
358 memcpy(stream->ust_metadata_poll_pipe,
359 ust_metadata_pipe,
360 sizeof(ust_metadata_pipe));
361 }
d88aee68 362 }
ffe60014
DG
363 }
364
365 return 0;
366
367error:
368error_alloc:
369 return ret;
370}
371
4628484a
MD
372/*
373 * create_posix_shm is never called concurrently within a process.
374 */
375static
376int create_posix_shm(void)
377{
378 char tmp_name[NAME_MAX];
379 int shmfd, ret;
380
381 ret = snprintf(tmp_name, NAME_MAX, "/ust-shm-consumer-%d", getpid());
382 if (ret < 0) {
383 PERROR("snprintf");
384 return -1;
385 }
386 /*
387 * Allocate shm, and immediately unlink its shm oject, keeping
388 * only the file descriptor as a reference to the object.
389 * We specifically do _not_ use the / at the beginning of the
390 * pathname so that some OS implementations can keep it local to
391 * the process (POSIX leaves this implementation-defined).
392 */
393 shmfd = shm_open(tmp_name, O_CREAT | O_EXCL | O_RDWR, 0700);
394 if (shmfd < 0) {
395 PERROR("shm_open");
396 goto error_shm_open;
397 }
398 ret = shm_unlink(tmp_name);
399 if (ret < 0 && errno != ENOENT) {
400 PERROR("shm_unlink");
401 goto error_shm_release;
402 }
403 return shmfd;
404
405error_shm_release:
406 ret = close(shmfd);
407 if (ret) {
408 PERROR("close");
409 }
410error_shm_open:
411 return -1;
412}
413
414static int open_ust_stream_fd(struct lttng_consumer_channel *channel,
415 struct ustctl_consumer_channel_attr *attr,
416 int cpu)
417{
418 char shm_path[PATH_MAX];
419 int ret;
420
421 if (!channel->shm_path[0]) {
422 return create_posix_shm();
423 }
424 ret = get_stream_shm_path(shm_path, channel->shm_path, cpu);
425 if (ret) {
426 goto error_shm_path;
427 }
428 return run_as_open(shm_path,
429 O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR,
430 channel->uid, channel->gid);
431
432error_shm_path:
433 return -1;
434}
435
ffe60014
DG
436/*
437 * Create an UST channel with the given attributes and send it to the session
438 * daemon using the ust ctl API.
439 *
440 * Return 0 on success or else a negative value.
441 */
4628484a
MD
442static int create_ust_channel(struct lttng_consumer_channel *channel,
443 struct ustctl_consumer_channel_attr *attr,
444 struct ustctl_consumer_channel **ust_chanp)
ffe60014 445{
4628484a
MD
446 int ret, nr_stream_fds, i, j;
447 int *stream_fds;
448 struct ustctl_consumer_channel *ust_channel;
ffe60014 449
4628484a 450 assert(channel);
ffe60014 451 assert(attr);
4628484a 452 assert(ust_chanp);
ffe60014
DG
453
454 DBG3("Creating channel to ustctl with attr: [overwrite: %d, "
455 "subbuf_size: %" PRIu64 ", num_subbuf: %" PRIu64 ", "
456 "switch_timer_interval: %u, read_timer_interval: %u, "
457 "output: %d, type: %d", attr->overwrite, attr->subbuf_size,
458 attr->num_subbuf, attr->switch_timer_interval,
459 attr->read_timer_interval, attr->output, attr->type);
460
4628484a
MD
461 if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA)
462 nr_stream_fds = 1;
463 else
464 nr_stream_fds = ustctl_get_nr_stream_per_channel();
465 stream_fds = zmalloc(nr_stream_fds * sizeof(*stream_fds));
466 if (!stream_fds) {
467 ret = -1;
468 goto error_alloc;
469 }
470 for (i = 0; i < nr_stream_fds; i++) {
471 stream_fds[i] = open_ust_stream_fd(channel, attr, i);
472 if (stream_fds[i] < 0) {
473 ret = -1;
474 goto error_open;
475 }
476 }
477 ust_channel = ustctl_create_channel(attr, stream_fds, nr_stream_fds);
478 if (!ust_channel) {
ffe60014
DG
479 ret = -1;
480 goto error_create;
481 }
4628484a
MD
482 channel->nr_stream_fds = nr_stream_fds;
483 channel->stream_fds = stream_fds;
484 *ust_chanp = ust_channel;
ffe60014
DG
485
486 return 0;
487
488error_create:
4628484a
MD
489error_open:
490 for (j = i - 1; j >= 0; j--) {
491 int closeret;
492
493 closeret = close(stream_fds[j]);
494 if (closeret) {
495 PERROR("close");
496 }
497 if (channel->shm_path[0]) {
498 char shm_path[PATH_MAX];
499
500 closeret = get_stream_shm_path(shm_path,
501 channel->shm_path, j);
502 if (closeret) {
503 ERR("Cannot get stream shm path");
504 }
505 closeret = run_as_unlink(shm_path,
506 channel->uid, channel->gid);
507 if (closeret) {
4628484a
MD
508 PERROR("unlink %s", shm_path);
509 }
510 }
511 }
512 /* Try to rmdir all directories under shm_path root. */
513 if (channel->root_shm_path[0]) {
514 (void) run_as_recursive_rmdir(channel->root_shm_path,
515 channel->uid, channel->gid);
516 }
517 free(stream_fds);
518error_alloc:
ffe60014
DG
519 return ret;
520}
521
d88aee68
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522/*
523 * Send a single given stream to the session daemon using the sock.
524 *
525 * Return 0 on success else a negative value.
526 */
ffe60014
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527static int send_sessiond_stream(int sock, struct lttng_consumer_stream *stream)
528{
529 int ret;
530
531 assert(stream);
532 assert(sock >= 0);
533
3eb914c0 534 DBG("UST consumer sending stream %" PRIu64 " to sessiond", stream->key);
ffe60014
DG
535
536 /* Send stream to session daemon. */
537 ret = ustctl_send_stream_to_sessiond(sock, stream->ustream);
538 if (ret < 0) {
539 goto error;
540 }
541
ffe60014
DG
542error:
543 return ret;
544}
545
546/*
547 * Send channel to sessiond.
548 *
d88aee68 549 * Return 0 on success or else a negative value.
ffe60014
DG
550 */
551static int send_sessiond_channel(int sock,
552 struct lttng_consumer_channel *channel,
553 struct lttng_consumer_local_data *ctx, int *relayd_error)
554{
0c759fc9 555 int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS;
ffe60014 556 struct lttng_consumer_stream *stream;
a4baae1b 557 uint64_t net_seq_idx = -1ULL;
ffe60014
DG
558
559 assert(channel);
560 assert(ctx);
561 assert(sock >= 0);
562
563 DBG("UST consumer sending channel %s to sessiond", channel->name);
564
62285ea4
DG
565 if (channel->relayd_id != (uint64_t) -1ULL) {
566 cds_list_for_each_entry(stream, &channel->streams.head, send_node) {
9ce5646a
MD
567
568 health_code_update();
569
62285ea4
DG
570 /* Try to send the stream to the relayd if one is available. */
571 ret = consumer_send_relayd_stream(stream, stream->chan->pathname);
572 if (ret < 0) {
573 /*
574 * Flag that the relayd was the problem here probably due to a
575 * communicaton error on the socket.
576 */
577 if (relayd_error) {
578 *relayd_error = 1;
579 }
725d28b2 580 ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL;
ffe60014 581 }
a4baae1b
JD
582 if (net_seq_idx == -1ULL) {
583 net_seq_idx = stream->net_seq_idx;
584 }
585 }
f2a444f1 586 }
ffe60014 587
f2a444f1
DG
588 /* Inform sessiond that we are about to send channel and streams. */
589 ret = consumer_send_status_msg(sock, ret_code);
0c759fc9 590 if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) {
f2a444f1
DG
591 /*
592 * Either the session daemon is not responding or the relayd died so we
593 * stop now.
594 */
595 goto error;
596 }
597
598 /* Send channel to sessiond. */
599 ret = ustctl_send_channel_to_sessiond(sock, channel->uchan);
600 if (ret < 0) {
601 goto error;
602 }
603
604 ret = ustctl_channel_close_wakeup_fd(channel->uchan);
605 if (ret < 0) {
606 goto error;
607 }
608
609 /* The channel was sent successfully to the sessiond at this point. */
610 cds_list_for_each_entry(stream, &channel->streams.head, send_node) {
9ce5646a
MD
611
612 health_code_update();
613
ffe60014
DG
614 /* Send stream to session daemon. */
615 ret = send_sessiond_stream(sock, stream);
616 if (ret < 0) {
617 goto error;
618 }
619 }
620
621 /* Tell sessiond there is no more stream. */
622 ret = ustctl_send_stream_to_sessiond(sock, NULL);
623 if (ret < 0) {
624 goto error;
625 }
626
627 DBG("UST consumer NULL stream sent to sessiond");
628
629 return 0;
630
631error:
0c759fc9 632 if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) {
f2a444f1
DG
633 ret = -1;
634 }
ffe60014
DG
635 return ret;
636}
637
638/*
639 * Creates a channel and streams and add the channel it to the channel internal
640 * state. The created stream must ONLY be sent once the GET_CHANNEL command is
641 * received.
642 *
643 * Return 0 on success or else, a negative value is returned and the channel
644 * MUST be destroyed by consumer_del_channel().
645 */
646static int ask_channel(struct lttng_consumer_local_data *ctx, int sock,
647 struct lttng_consumer_channel *channel,
648 struct ustctl_consumer_channel_attr *attr)
3bd1e081
MD
649{
650 int ret;
651
ffe60014
DG
652 assert(ctx);
653 assert(channel);
654 assert(attr);
655
656 /*
657 * This value is still used by the kernel consumer since for the kernel,
658 * the stream ownership is not IN the consumer so we need to have the
659 * number of left stream that needs to be initialized so we can know when
660 * to delete the channel (see consumer.c).
661 *
662 * As for the user space tracer now, the consumer creates and sends the
663 * stream to the session daemon which only sends them to the application
664 * once every stream of a channel is received making this value useless
665 * because we they will be added to the poll thread before the application
666 * receives them. This ensures that a stream can not hang up during
667 * initilization of a channel.
668 */
669 channel->nb_init_stream_left = 0;
670
671 /* The reply msg status is handled in the following call. */
4628484a 672 ret = create_ust_channel(channel, attr, &channel->uchan);
ffe60014 673 if (ret < 0) {
10a50311 674 goto end;
3bd1e081
MD
675 }
676
d8ef542d
MD
677 channel->wait_fd = ustctl_channel_get_wait_fd(channel->uchan);
678
10a50311
JD
679 /*
680 * For the snapshots (no monitor), we create the metadata streams
681 * on demand, not during the channel creation.
682 */
683 if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && !channel->monitor) {
684 ret = 0;
685 goto end;
686 }
687
ffe60014
DG
688 /* Open all streams for this channel. */
689 ret = create_ust_streams(channel, ctx);
690 if (ret < 0) {
10a50311 691 goto end;
ffe60014
DG
692 }
693
10a50311 694end:
3bd1e081
MD
695 return ret;
696}
697
d88aee68
DG
698/*
699 * Send all stream of a channel to the right thread handling it.
700 *
701 * On error, return a negative value else 0 on success.
702 */
703static int send_streams_to_thread(struct lttng_consumer_channel *channel,
704 struct lttng_consumer_local_data *ctx)
705{
706 int ret = 0;
707 struct lttng_consumer_stream *stream, *stmp;
708
709 assert(channel);
710 assert(ctx);
711
712 /* Send streams to the corresponding thread. */
713 cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head,
714 send_node) {
9ce5646a
MD
715
716 health_code_update();
717
d88aee68
DG
718 /* Sending the stream to the thread. */
719 ret = send_stream_to_thread(stream, ctx);
720 if (ret < 0) {
721 /*
722 * If we are unable to send the stream to the thread, there is
723 * a big problem so just stop everything.
724 */
5ab66908
MD
725 /* Remove node from the channel stream list. */
726 cds_list_del(&stream->send_node);
d88aee68
DG
727 goto error;
728 }
729
730 /* Remove node from the channel stream list. */
731 cds_list_del(&stream->send_node);
4891ece8 732
d88aee68
DG
733 }
734
735error:
736 return ret;
737}
738
7972aab2
DG
739/*
740 * Flush channel's streams using the given key to retrieve the channel.
741 *
742 * Return 0 on success else an LTTng error code.
743 */
744static int flush_channel(uint64_t chan_key)
745{
746 int ret = 0;
747 struct lttng_consumer_channel *channel;
748 struct lttng_consumer_stream *stream;
749 struct lttng_ht *ht;
750 struct lttng_ht_iter iter;
751
8fd623e0 752 DBG("UST consumer flush channel key %" PRIu64, chan_key);
7972aab2 753
a500c257 754 rcu_read_lock();
7972aab2
DG
755 channel = consumer_find_channel(chan_key);
756 if (!channel) {
8fd623e0 757 ERR("UST consumer flush channel %" PRIu64 " not found", chan_key);
7972aab2
DG
758 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
759 goto error;
760 }
761
762 ht = consumer_data.stream_per_chan_id_ht;
763
764 /* For each stream of the channel id, flush it. */
7972aab2
DG
765 cds_lfht_for_each_entry_duplicate(ht->ht,
766 ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct,
767 &channel->key, &iter.iter, stream, node_channel_id.node) {
9ce5646a
MD
768
769 health_code_update();
770
b8086166 771 ustctl_flush_buffer(stream->ustream, 1);
7972aab2 772 }
7972aab2 773error:
a500c257 774 rcu_read_unlock();
7972aab2
DG
775 return ret;
776}
777
d88aee68
DG
778/*
779 * Close metadata stream wakeup_fd using the given key to retrieve the channel.
a500c257 780 * RCU read side lock MUST be acquired before calling this function.
d88aee68
DG
781 *
782 * Return 0 on success else an LTTng error code.
783 */
784static int close_metadata(uint64_t chan_key)
785{
ea88ca2a 786 int ret = 0;
d88aee68
DG
787 struct lttng_consumer_channel *channel;
788
8fd623e0 789 DBG("UST consumer close metadata key %" PRIu64, chan_key);
d88aee68
DG
790
791 channel = consumer_find_channel(chan_key);
792 if (!channel) {
84cc9aa0
DG
793 /*
794 * This is possible if the metadata thread has issue a delete because
795 * the endpoint point of the stream hung up. There is no way the
796 * session daemon can know about it thus use a DBG instead of an actual
797 * error.
798 */
799 DBG("UST consumer close metadata %" PRIu64 " not found", chan_key);
d88aee68
DG
800 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
801 goto error;
802 }
803
ea88ca2a 804 pthread_mutex_lock(&consumer_data.lock);
a9838785 805 pthread_mutex_lock(&channel->lock);
73811ecc
DG
806
807 if (cds_lfht_is_node_deleted(&channel->node.node)) {
808 goto error_unlock;
809 }
810
6d574024 811 lttng_ustconsumer_close_metadata(channel);
d88aee68 812
ea88ca2a 813error_unlock:
a9838785 814 pthread_mutex_unlock(&channel->lock);
ea88ca2a 815 pthread_mutex_unlock(&consumer_data.lock);
d88aee68
DG
816error:
817 return ret;
818}
819
820/*
821 * RCU read side lock MUST be acquired before calling this function.
822 *
823 * Return 0 on success else an LTTng error code.
824 */
825static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key)
826{
827 int ret;
828 struct lttng_consumer_channel *metadata;
829
8fd623e0 830 DBG("UST consumer setup metadata key %" PRIu64, key);
d88aee68
DG
831
832 metadata = consumer_find_channel(key);
833 if (!metadata) {
834 ERR("UST consumer push metadata %" PRIu64 " not found", key);
835 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
10a50311
JD
836 goto end;
837 }
838
839 /*
840 * In no monitor mode, the metadata channel has no stream(s) so skip the
841 * ownership transfer to the metadata thread.
842 */
843 if (!metadata->monitor) {
844 DBG("Metadata channel in no monitor");
845 ret = 0;
846 goto end;
d88aee68
DG
847 }
848
849 /*
850 * Send metadata stream to relayd if one available. Availability is
851 * known if the stream is still in the list of the channel.
852 */
853 if (cds_list_empty(&metadata->streams.head)) {
854 ERR("Metadata channel key %" PRIu64 ", no stream available.", key);
855 ret = LTTCOMM_CONSUMERD_ERROR_METADATA;
f5a0c9cf 856 goto error_no_stream;
d88aee68
DG
857 }
858
859 /* Send metadata stream to relayd if needed. */
62285ea4
DG
860 if (metadata->metadata_stream->net_seq_idx != (uint64_t) -1ULL) {
861 ret = consumer_send_relayd_stream(metadata->metadata_stream,
862 metadata->pathname);
863 if (ret < 0) {
864 ret = LTTCOMM_CONSUMERD_ERROR_METADATA;
865 goto error;
866 }
601262d6
JD
867 ret = consumer_send_relayd_streams_sent(
868 metadata->metadata_stream->net_seq_idx);
869 if (ret < 0) {
870 ret = LTTCOMM_CONSUMERD_RELAYD_FAIL;
871 goto error;
872 }
d88aee68
DG
873 }
874
875 ret = send_streams_to_thread(metadata, ctx);
876 if (ret < 0) {
877 /*
878 * If we are unable to send the stream to the thread, there is
879 * a big problem so just stop everything.
880 */
881 ret = LTTCOMM_CONSUMERD_FATAL;
882 goto error;
883 }
884 /* List MUST be empty after or else it could be reused. */
885 assert(cds_list_empty(&metadata->streams.head));
886
10a50311
JD
887 ret = 0;
888 goto end;
d88aee68
DG
889
890error:
f2a444f1
DG
891 /*
892 * Delete metadata channel on error. At this point, the metadata stream can
893 * NOT be monitored by the metadata thread thus having the guarantee that
894 * the stream is still in the local stream list of the channel. This call
895 * will make sure to clean that list.
896 */
f5a0c9cf 897 consumer_stream_destroy(metadata->metadata_stream, NULL);
212d67a2
DG
898 cds_list_del(&metadata->metadata_stream->send_node);
899 metadata->metadata_stream = NULL;
f5a0c9cf 900error_no_stream:
10a50311
JD
901end:
902 return ret;
903}
904
905/*
906 * Snapshot the whole metadata.
907 *
908 * Returns 0 on success, < 0 on error
909 */
910static int snapshot_metadata(uint64_t key, char *path, uint64_t relayd_id,
911 struct lttng_consumer_local_data *ctx)
912{
913 int ret = 0;
10a50311
JD
914 struct lttng_consumer_channel *metadata_channel;
915 struct lttng_consumer_stream *metadata_stream;
916
917 assert(path);
918 assert(ctx);
919
920 DBG("UST consumer snapshot metadata with key %" PRIu64 " at path %s",
921 key, path);
922
923 rcu_read_lock();
924
925 metadata_channel = consumer_find_channel(key);
926 if (!metadata_channel) {
6a00837f
MD
927 ERR("UST snapshot metadata channel not found for key %" PRIu64,
928 key);
10a50311
JD
929 ret = -1;
930 goto error;
931 }
932 assert(!metadata_channel->monitor);
933
9ce5646a
MD
934 health_code_update();
935
10a50311
JD
936 /*
937 * Ask the sessiond if we have new metadata waiting and update the
938 * consumer metadata cache.
939 */
94d49140 940 ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 1);
10a50311
JD
941 if (ret < 0) {
942 goto error;
943 }
944
9ce5646a
MD
945 health_code_update();
946
10a50311
JD
947 /*
948 * The metadata stream is NOT created in no monitor mode when the channel
949 * is created on a sessiond ask channel command.
950 */
951 ret = create_ust_streams(metadata_channel, ctx);
952 if (ret < 0) {
953 goto error;
954 }
955
956 metadata_stream = metadata_channel->metadata_stream;
957 assert(metadata_stream);
958
959 if (relayd_id != (uint64_t) -1ULL) {
960 metadata_stream->net_seq_idx = relayd_id;
961 ret = consumer_send_relayd_stream(metadata_stream, path);
962 if (ret < 0) {
963 goto error_stream;
964 }
965 } else {
966 ret = utils_create_stream_file(path, metadata_stream->name,
967 metadata_stream->chan->tracefile_size,
968 metadata_stream->tracefile_count_current,
309167d2 969 metadata_stream->uid, metadata_stream->gid, NULL);
10a50311
JD
970 if (ret < 0) {
971 goto error_stream;
972 }
973 metadata_stream->out_fd = ret;
974 metadata_stream->tracefile_size_current = 0;
975 }
976
04ef1097 977 do {
9ce5646a
MD
978 health_code_update();
979
10a50311
JD
980 ret = lttng_consumer_read_subbuffer(metadata_stream, ctx);
981 if (ret < 0) {
94d49140 982 goto error_stream;
10a50311 983 }
04ef1097 984 } while (ret > 0);
10a50311 985
10a50311
JD
986error_stream:
987 /*
988 * Clean up the stream completly because the next snapshot will use a new
989 * metadata stream.
990 */
10a50311 991 consumer_stream_destroy(metadata_stream, NULL);
212d67a2 992 cds_list_del(&metadata_stream->send_node);
10a50311
JD
993 metadata_channel->metadata_stream = NULL;
994
995error:
996 rcu_read_unlock();
997 return ret;
998}
999
1000/*
1001 * Take a snapshot of all the stream of a channel.
1002 *
1003 * Returns 0 on success, < 0 on error
1004 */
1005static int snapshot_channel(uint64_t key, char *path, uint64_t relayd_id,
d07ceecd 1006 uint64_t nb_packets_per_stream, struct lttng_consumer_local_data *ctx)
10a50311
JD
1007{
1008 int ret;
1009 unsigned use_relayd = 0;
1010 unsigned long consumed_pos, produced_pos;
1011 struct lttng_consumer_channel *channel;
1012 struct lttng_consumer_stream *stream;
1013
1014 assert(path);
1015 assert(ctx);
1016
1017 rcu_read_lock();
1018
1019 if (relayd_id != (uint64_t) -1ULL) {
1020 use_relayd = 1;
1021 }
1022
1023 channel = consumer_find_channel(key);
1024 if (!channel) {
6a00837f 1025 ERR("UST snapshot channel not found for key %" PRIu64, key);
10a50311
JD
1026 ret = -1;
1027 goto error;
1028 }
1029 assert(!channel->monitor);
6a00837f 1030 DBG("UST consumer snapshot channel %" PRIu64, key);
10a50311
JD
1031
1032 cds_list_for_each_entry(stream, &channel->streams.head, send_node) {
9ce5646a
MD
1033
1034 health_code_update();
1035
10a50311
JD
1036 /* Lock stream because we are about to change its state. */
1037 pthread_mutex_lock(&stream->lock);
1038 stream->net_seq_idx = relayd_id;
1039
1040 if (use_relayd) {
1041 ret = consumer_send_relayd_stream(stream, path);
1042 if (ret < 0) {
1043 goto error_unlock;
1044 }
1045 } else {
1046 ret = utils_create_stream_file(path, stream->name,
1047 stream->chan->tracefile_size,
1048 stream->tracefile_count_current,
309167d2 1049 stream->uid, stream->gid, NULL);
10a50311
JD
1050 if (ret < 0) {
1051 goto error_unlock;
1052 }
1053 stream->out_fd = ret;
1054 stream->tracefile_size_current = 0;
1055
1056 DBG("UST consumer snapshot stream %s/%s (%" PRIu64 ")", path,
1057 stream->name, stream->key);
1058 }
a4baae1b
JD
1059 if (relayd_id != -1ULL) {
1060 ret = consumer_send_relayd_streams_sent(relayd_id);
1061 if (ret < 0) {
1062 goto error_unlock;
1063 }
1064 }
10a50311
JD
1065
1066 ustctl_flush_buffer(stream->ustream, 1);
1067
1068 ret = lttng_ustconsumer_take_snapshot(stream);
1069 if (ret < 0) {
1070 ERR("Taking UST snapshot");
1071 goto error_unlock;
1072 }
1073
1074 ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos);
1075 if (ret < 0) {
1076 ERR("Produced UST snapshot position");
1077 goto error_unlock;
1078 }
1079
1080 ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos);
1081 if (ret < 0) {
1082 ERR("Consumerd UST snapshot position");
1083 goto error_unlock;
1084 }
1085
5c786ded
JD
1086 /*
1087 * The original value is sent back if max stream size is larger than
d07ceecd 1088 * the possible size of the snapshot. Also, we assume that the session
5c786ded
JD
1089 * daemon should never send a maximum stream size that is lower than
1090 * subbuffer size.
1091 */
d07ceecd
MD
1092 consumed_pos = consumer_get_consume_start_pos(consumed_pos,
1093 produced_pos, nb_packets_per_stream,
1094 stream->max_sb_size);
5c786ded 1095
10a50311
JD
1096 while (consumed_pos < produced_pos) {
1097 ssize_t read_len;
1098 unsigned long len, padded_len;
1099
9ce5646a
MD
1100 health_code_update();
1101
10a50311
JD
1102 DBG("UST consumer taking snapshot at pos %lu", consumed_pos);
1103
1104 ret = ustctl_get_subbuf(stream->ustream, &consumed_pos);
1105 if (ret < 0) {
1106 if (ret != -EAGAIN) {
1107 PERROR("ustctl_get_subbuf snapshot");
1108 goto error_close_stream;
1109 }
1110 DBG("UST consumer get subbuf failed. Skipping it.");
1111 consumed_pos += stream->max_sb_size;
1112 continue;
1113 }
1114
1115 ret = ustctl_get_subbuf_size(stream->ustream, &len);
1116 if (ret < 0) {
1117 ERR("Snapshot ustctl_get_subbuf_size");
1118 goto error_put_subbuf;
1119 }
1120
1121 ret = ustctl_get_padded_subbuf_size(stream->ustream, &padded_len);
1122 if (ret < 0) {
1123 ERR("Snapshot ustctl_get_padded_subbuf_size");
1124 goto error_put_subbuf;
1125 }
1126
1127 read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len,
309167d2 1128 padded_len - len, NULL);
10a50311
JD
1129 if (use_relayd) {
1130 if (read_len != len) {
56591bac 1131 ret = -EPERM;
10a50311
JD
1132 goto error_put_subbuf;
1133 }
1134 } else {
1135 if (read_len != padded_len) {
56591bac 1136 ret = -EPERM;
10a50311
JD
1137 goto error_put_subbuf;
1138 }
1139 }
1140
1141 ret = ustctl_put_subbuf(stream->ustream);
1142 if (ret < 0) {
1143 ERR("Snapshot ustctl_put_subbuf");
1144 goto error_close_stream;
1145 }
1146 consumed_pos += stream->max_sb_size;
1147 }
1148
1149 /* Simply close the stream so we can use it on the next snapshot. */
1150 consumer_stream_close(stream);
1151 pthread_mutex_unlock(&stream->lock);
1152 }
1153
1154 rcu_read_unlock();
1155 return 0;
1156
1157error_put_subbuf:
1158 if (ustctl_put_subbuf(stream->ustream) < 0) {
1159 ERR("Snapshot ustctl_put_subbuf");
1160 }
1161error_close_stream:
1162 consumer_stream_close(stream);
1163error_unlock:
1164 pthread_mutex_unlock(&stream->lock);
1165error:
1166 rcu_read_unlock();
d88aee68
DG
1167 return ret;
1168}
1169
331744e3 1170/*
c585821b
MD
1171 * Receive the metadata updates from the sessiond. Supports receiving
1172 * overlapping metadata, but is needs to always belong to a contiguous
1173 * range starting from 0.
1174 * Be careful about the locks held when calling this function: it needs
1175 * the metadata cache flush to concurrently progress in order to
1176 * complete.
331744e3
JD
1177 */
1178int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset,
5e41ebe1 1179 uint64_t len, struct lttng_consumer_channel *channel,
94d49140 1180 int timer, int wait)
331744e3 1181{
0c759fc9 1182 int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS;
331744e3
JD
1183 char *metadata_str;
1184
8fd623e0 1185 DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len);
331744e3
JD
1186
1187 metadata_str = zmalloc(len * sizeof(char));
1188 if (!metadata_str) {
1189 PERROR("zmalloc metadata string");
1190 ret_code = LTTCOMM_CONSUMERD_ENOMEM;
1191 goto end;
1192 }
1193
9ce5646a
MD
1194 health_code_update();
1195
331744e3
JD
1196 /* Receive metadata string. */
1197 ret = lttcomm_recv_unix_sock(sock, metadata_str, len);
1198 if (ret < 0) {
1199 /* Session daemon is dead so return gracefully. */
1200 ret_code = ret;
1201 goto end_free;
1202 }
1203
9ce5646a
MD
1204 health_code_update();
1205
331744e3
JD
1206 pthread_mutex_lock(&channel->metadata_cache->lock);
1207 ret = consumer_metadata_cache_write(channel, offset, len, metadata_str);
1208 if (ret < 0) {
1209 /* Unable to handle metadata. Notify session daemon. */
1210 ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA;
a32bd775
DG
1211 /*
1212 * Skip metadata flush on write error since the offset and len might
1213 * not have been updated which could create an infinite loop below when
1214 * waiting for the metadata cache to be flushed.
1215 */
1216 pthread_mutex_unlock(&channel->metadata_cache->lock);
a32bd775 1217 goto end_free;
331744e3
JD
1218 }
1219 pthread_mutex_unlock(&channel->metadata_cache->lock);
1220
94d49140
JD
1221 if (!wait) {
1222 goto end_free;
1223 }
5e41ebe1 1224 while (consumer_metadata_cache_flushed(channel, offset + len, timer)) {
331744e3 1225 DBG("Waiting for metadata to be flushed");
9ce5646a
MD
1226
1227 health_code_update();
1228
331744e3
JD
1229 usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME);
1230 }
1231
1232end_free:
1233 free(metadata_str);
1234end:
1235 return ret_code;
1236}
1237
4cbc1a04
DG
1238/*
1239 * Receive command from session daemon and process it.
1240 *
1241 * Return 1 on success else a negative value or 0.
1242 */
3bd1e081
MD
1243int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx,
1244 int sock, struct pollfd *consumer_sockpoll)
1245{
1246 ssize_t ret;
0c759fc9 1247 enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS;
3bd1e081 1248 struct lttcomm_consumer_msg msg;
ffe60014 1249 struct lttng_consumer_channel *channel = NULL;
3bd1e081 1250
9ce5646a
MD
1251 health_code_update();
1252
3bd1e081
MD
1253 ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg));
1254 if (ret != sizeof(msg)) {
173af62f
DG
1255 DBG("Consumer received unexpected message size %zd (expects %zu)",
1256 ret, sizeof(msg));
3be74084
DG
1257 /*
1258 * The ret value might 0 meaning an orderly shutdown but this is ok
1259 * since the caller handles this.
1260 */
489f70e9 1261 if (ret > 0) {
c6857fcf 1262 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD);
489f70e9
MD
1263 ret = -1;
1264 }
3bd1e081
MD
1265 return ret;
1266 }
9ce5646a
MD
1267
1268 health_code_update();
1269
84382d49
MD
1270 /* deprecated */
1271 assert(msg.cmd_type != LTTNG_CONSUMER_STOP);
3bd1e081 1272
9ce5646a
MD
1273 health_code_update();
1274
3f8e211f 1275 /* relayd needs RCU read-side lock */
b0b335c8
MD
1276 rcu_read_lock();
1277
3bd1e081 1278 switch (msg.cmd_type) {
00e2e675
DG
1279 case LTTNG_CONSUMER_ADD_RELAYD_SOCKET:
1280 {
f50f23d9 1281 /* Session daemon status message are handled in the following call. */
7735ef9e
DG
1282 ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index,
1283 msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll,
d3e2ba59
JD
1284 &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id,
1285 msg.u.relayd_sock.relayd_session_id);
00e2e675
DG
1286 goto end_nosignal;
1287 }
173af62f
DG
1288 case LTTNG_CONSUMER_DESTROY_RELAYD:
1289 {
a6ba4fe1 1290 uint64_t index = msg.u.destroy_relayd.net_seq_idx;
173af62f
DG
1291 struct consumer_relayd_sock_pair *relayd;
1292
a6ba4fe1 1293 DBG("UST consumer destroying relayd %" PRIu64, index);
173af62f
DG
1294
1295 /* Get relayd reference if exists. */
a6ba4fe1 1296 relayd = consumer_find_relayd(index);
173af62f 1297 if (relayd == NULL) {
3448e266 1298 DBG("Unable to find relayd %" PRIu64, index);
e462382a 1299 ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL;
173af62f
DG
1300 }
1301
a6ba4fe1
DG
1302 /*
1303 * Each relayd socket pair has a refcount of stream attached to it
1304 * which tells if the relayd is still active or not depending on the
1305 * refcount value.
1306 *
1307 * This will set the destroy flag of the relayd object and destroy it
1308 * if the refcount reaches zero when called.
1309 *
1310 * The destroy can happen either here or when a stream fd hangs up.
1311 */
f50f23d9
DG
1312 if (relayd) {
1313 consumer_flag_relayd_for_destroy(relayd);
1314 }
1315
d88aee68 1316 goto end_msg_sessiond;
173af62f 1317 }
3bd1e081
MD
1318 case LTTNG_CONSUMER_UPDATE_STREAM:
1319 {
3f8e211f 1320 rcu_read_unlock();
7ad0a0cb 1321 return -ENOSYS;
3bd1e081 1322 }
6d805429 1323 case LTTNG_CONSUMER_DATA_PENDING:
53632229 1324 {
3be74084 1325 int ret, is_data_pending;
6d805429 1326 uint64_t id = msg.u.data_pending.session_id;
ca22feea 1327
6d805429 1328 DBG("UST consumer data pending command for id %" PRIu64, id);
ca22feea 1329
3be74084 1330 is_data_pending = consumer_data_pending(id);
ca22feea
DG
1331
1332 /* Send back returned value to session daemon */
3be74084
DG
1333 ret = lttcomm_send_unix_sock(sock, &is_data_pending,
1334 sizeof(is_data_pending));
ca22feea 1335 if (ret < 0) {
3be74084 1336 DBG("Error when sending the data pending ret code: %d", ret);
489f70e9 1337 goto error_fatal;
ca22feea 1338 }
f50f23d9
DG
1339
1340 /*
1341 * No need to send back a status message since the data pending
1342 * returned value is the response.
1343 */
ca22feea 1344 break;
53632229 1345 }
ffe60014
DG
1346 case LTTNG_CONSUMER_ASK_CHANNEL_CREATION:
1347 {
1348 int ret;
1349 struct ustctl_consumer_channel_attr attr;
1350
1351 /* Create a plain object and reserve a channel key. */
1352 channel = allocate_channel(msg.u.ask_channel.session_id,
1353 msg.u.ask_channel.pathname, msg.u.ask_channel.name,
1354 msg.u.ask_channel.uid, msg.u.ask_channel.gid,
1355 msg.u.ask_channel.relayd_id, msg.u.ask_channel.key,
1624d5b7
JD
1356 (enum lttng_event_output) msg.u.ask_channel.output,
1357 msg.u.ask_channel.tracefile_size,
2bba9e53 1358 msg.u.ask_channel.tracefile_count,
1950109e 1359 msg.u.ask_channel.session_id_per_pid,
ecc48a90 1360 msg.u.ask_channel.monitor,
d7ba1388 1361 msg.u.ask_channel.live_timer_interval,
3d071855 1362 msg.u.ask_channel.root_shm_path,
d7ba1388 1363 msg.u.ask_channel.shm_path);
ffe60014
DG
1364 if (!channel) {
1365 goto end_channel_error;
1366 }
1367
567eb353
DG
1368 /*
1369 * Assign UST application UID to the channel. This value is ignored for
1370 * per PID buffers. This is specific to UST thus setting this after the
1371 * allocation.
1372 */
1373 channel->ust_app_uid = msg.u.ask_channel.ust_app_uid;
1374
ffe60014
DG
1375 /* Build channel attributes from received message. */
1376 attr.subbuf_size = msg.u.ask_channel.subbuf_size;
1377 attr.num_subbuf = msg.u.ask_channel.num_subbuf;
1378 attr.overwrite = msg.u.ask_channel.overwrite;
1379 attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval;
1380 attr.read_timer_interval = msg.u.ask_channel.read_timer_interval;
7972aab2 1381 attr.chan_id = msg.u.ask_channel.chan_id;
ffe60014
DG
1382 memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid));
1383
0c759fc9
DG
1384 /* Match channel buffer type to the UST abi. */
1385 switch (msg.u.ask_channel.output) {
1386 case LTTNG_EVENT_MMAP:
1387 default:
1388 attr.output = LTTNG_UST_MMAP;
1389 break;
1390 }
1391
ffe60014
DG
1392 /* Translate and save channel type. */
1393 switch (msg.u.ask_channel.type) {
1394 case LTTNG_UST_CHAN_PER_CPU:
1395 channel->type = CONSUMER_CHANNEL_TYPE_DATA;
1396 attr.type = LTTNG_UST_CHAN_PER_CPU;
8633d6e3
MD
1397 /*
1398 * Set refcount to 1 for owner. Below, we will
1399 * pass ownership to the
1400 * consumer_thread_channel_poll() thread.
1401 */
1402 channel->refcount = 1;
ffe60014
DG
1403 break;
1404 case LTTNG_UST_CHAN_METADATA:
1405 channel->type = CONSUMER_CHANNEL_TYPE_METADATA;
1406 attr.type = LTTNG_UST_CHAN_METADATA;
1407 break;
1408 default:
1409 assert(0);
1410 goto error_fatal;
1411 };
1412
9ce5646a
MD
1413 health_code_update();
1414
ffe60014
DG
1415 ret = ask_channel(ctx, sock, channel, &attr);
1416 if (ret < 0) {
1417 goto end_channel_error;
1418 }
1419
fc643247
MD
1420 if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) {
1421 ret = consumer_metadata_cache_allocate(channel);
1422 if (ret < 0) {
1423 ERR("Allocating metadata cache");
1424 goto end_channel_error;
1425 }
1426 consumer_timer_switch_start(channel, attr.switch_timer_interval);
1427 attr.switch_timer_interval = 0;
94d49140
JD
1428 } else {
1429 consumer_timer_live_start(channel,
1430 msg.u.ask_channel.live_timer_interval);
fc643247
MD
1431 }
1432
9ce5646a
MD
1433 health_code_update();
1434
ffe60014
DG
1435 /*
1436 * Add the channel to the internal state AFTER all streams were created
1437 * and successfully sent to session daemon. This way, all streams must
1438 * be ready before this channel is visible to the threads.
fc643247
MD
1439 * If add_channel succeeds, ownership of the channel is
1440 * passed to consumer_thread_channel_poll().
ffe60014
DG
1441 */
1442 ret = add_channel(channel, ctx);
1443 if (ret < 0) {
ea88ca2a
MD
1444 if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) {
1445 if (channel->switch_timer_enabled == 1) {
1446 consumer_timer_switch_stop(channel);
1447 }
1448 consumer_metadata_cache_destroy(channel);
1449 }
d3e2ba59
JD
1450 if (channel->live_timer_enabled == 1) {
1451 consumer_timer_live_stop(channel);
1452 }
ffe60014
DG
1453 goto end_channel_error;
1454 }
1455
9ce5646a
MD
1456 health_code_update();
1457
ffe60014
DG
1458 /*
1459 * Channel and streams are now created. Inform the session daemon that
1460 * everything went well and should wait to receive the channel and
1461 * streams with ustctl API.
1462 */
1463 ret = consumer_send_status_channel(sock, channel);
1464 if (ret < 0) {
1465 /*
489f70e9 1466 * There is probably a problem on the socket.
ffe60014 1467 */
489f70e9 1468 goto error_fatal;
ffe60014
DG
1469 }
1470
1471 break;
1472 }
1473 case LTTNG_CONSUMER_GET_CHANNEL:
1474 {
1475 int ret, relayd_err = 0;
d88aee68 1476 uint64_t key = msg.u.get_channel.key;
ffe60014 1477 struct lttng_consumer_channel *channel;
ffe60014
DG
1478
1479 channel = consumer_find_channel(key);
1480 if (!channel) {
8fd623e0 1481 ERR("UST consumer get channel key %" PRIu64 " not found", key);
e462382a 1482 ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND;
ffe60014
DG
1483 goto end_msg_sessiond;
1484 }
1485
9ce5646a
MD
1486 health_code_update();
1487
ffe60014
DG
1488 /* Send everything to sessiond. */
1489 ret = send_sessiond_channel(sock, channel, ctx, &relayd_err);
1490 if (ret < 0) {
1491 if (relayd_err) {
1492 /*
1493 * We were unable to send to the relayd the stream so avoid
1494 * sending back a fatal error to the thread since this is OK
f2a444f1
DG
1495 * and the consumer can continue its work. The above call
1496 * has sent the error status message to the sessiond.
ffe60014 1497 */
f2a444f1 1498 goto end_nosignal;
ffe60014
DG
1499 }
1500 /*
1501 * The communicaton was broken hence there is a bad state between
1502 * the consumer and sessiond so stop everything.
1503 */
1504 goto error_fatal;
1505 }
1506
9ce5646a
MD
1507 health_code_update();
1508
10a50311
JD
1509 /*
1510 * In no monitor mode, the streams ownership is kept inside the channel
1511 * so don't send them to the data thread.
1512 */
1513 if (!channel->monitor) {
1514 goto end_msg_sessiond;
1515 }
1516
d88aee68
DG
1517 ret = send_streams_to_thread(channel, ctx);
1518 if (ret < 0) {
1519 /*
1520 * If we are unable to send the stream to the thread, there is
1521 * a big problem so just stop everything.
1522 */
1523 goto error_fatal;
ffe60014 1524 }
ffe60014
DG
1525 /* List MUST be empty after or else it could be reused. */
1526 assert(cds_list_empty(&channel->streams.head));
d88aee68
DG
1527 goto end_msg_sessiond;
1528 }
1529 case LTTNG_CONSUMER_DESTROY_CHANNEL:
1530 {
1531 uint64_t key = msg.u.destroy_channel.key;
d88aee68 1532
a0cbdd2e
MD
1533 /*
1534 * Only called if streams have not been sent to stream
1535 * manager thread. However, channel has been sent to
1536 * channel manager thread.
1537 */
1538 notify_thread_del_channel(ctx, key);
d88aee68 1539 goto end_msg_sessiond;
ffe60014 1540 }
d88aee68
DG
1541 case LTTNG_CONSUMER_CLOSE_METADATA:
1542 {
1543 int ret;
1544
1545 ret = close_metadata(msg.u.close_metadata.key);
1546 if (ret != 0) {
1547 ret_code = ret;
1548 }
1549
1550 goto end_msg_sessiond;
1551 }
7972aab2
DG
1552 case LTTNG_CONSUMER_FLUSH_CHANNEL:
1553 {
1554 int ret;
1555
1556 ret = flush_channel(msg.u.flush_channel.key);
1557 if (ret != 0) {
1558 ret_code = ret;
1559 }
1560
1561 goto end_msg_sessiond;
1562 }
d88aee68 1563 case LTTNG_CONSUMER_PUSH_METADATA:
ffe60014
DG
1564 {
1565 int ret;
d88aee68 1566 uint64_t len = msg.u.push_metadata.len;
d88aee68 1567 uint64_t key = msg.u.push_metadata.key;
331744e3 1568 uint64_t offset = msg.u.push_metadata.target_offset;
ffe60014
DG
1569 struct lttng_consumer_channel *channel;
1570
8fd623e0
DG
1571 DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key,
1572 len);
ffe60014
DG
1573
1574 channel = consumer_find_channel(key);
1575 if (!channel) {
000baf6a
DG
1576 /*
1577 * This is possible if the metadata creation on the consumer side
1578 * is in flight vis-a-vis a concurrent push metadata from the
1579 * session daemon. Simply return that the channel failed and the
1580 * session daemon will handle that message correctly considering
1581 * that this race is acceptable thus the DBG() statement here.
1582 */
1583 DBG("UST consumer push metadata %" PRIu64 " not found", key);
1584 ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL;
4a2eb0ca 1585 goto end_msg_sessiond;
d88aee68
DG
1586 }
1587
9ce5646a
MD
1588 health_code_update();
1589
c585821b
MD
1590 if (!len) {
1591 /*
1592 * There is nothing to receive. We have simply
1593 * checked whether the channel can be found.
1594 */
1595 ret_code = LTTCOMM_CONSUMERD_SUCCESS;
1596 goto end_msg_sessiond;
1597 }
1598
d88aee68 1599 /* Tell session daemon we are ready to receive the metadata. */
0c759fc9 1600 ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS);
ffe60014
DG
1601 if (ret < 0) {
1602 /* Somehow, the session daemon is not responding anymore. */
d88aee68
DG
1603 goto error_fatal;
1604 }
1605
9ce5646a
MD
1606 health_code_update();
1607
d88aee68 1608 /* Wait for more data. */
9ce5646a
MD
1609 health_poll_entry();
1610 ret = lttng_consumer_poll_socket(consumer_sockpoll);
1611 health_poll_exit();
84382d49 1612 if (ret) {
489f70e9 1613 goto error_fatal;
d88aee68
DG
1614 }
1615
9ce5646a
MD
1616 health_code_update();
1617
331744e3 1618 ret = lttng_ustconsumer_recv_metadata(sock, key, offset,
94d49140 1619 len, channel, 0, 1);
d88aee68 1620 if (ret < 0) {
331744e3 1621 /* error receiving from sessiond */
489f70e9 1622 goto error_fatal;
331744e3
JD
1623 } else {
1624 ret_code = ret;
d88aee68
DG
1625 goto end_msg_sessiond;
1626 }
d88aee68
DG
1627 }
1628 case LTTNG_CONSUMER_SETUP_METADATA:
1629 {
1630 int ret;
1631
1632 ret = setup_metadata(ctx, msg.u.setup_metadata.key);
1633 if (ret) {
1634 ret_code = ret;
1635 }
1636 goto end_msg_sessiond;
ffe60014 1637 }
6dc3064a
DG
1638 case LTTNG_CONSUMER_SNAPSHOT_CHANNEL:
1639 {
10a50311
JD
1640 if (msg.u.snapshot_channel.metadata) {
1641 ret = snapshot_metadata(msg.u.snapshot_channel.key,
1642 msg.u.snapshot_channel.pathname,
1643 msg.u.snapshot_channel.relayd_id,
1644 ctx);
1645 if (ret < 0) {
1646 ERR("Snapshot metadata failed");
e462382a 1647 ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA;
10a50311
JD
1648 }
1649 } else {
1650 ret = snapshot_channel(msg.u.snapshot_channel.key,
1651 msg.u.snapshot_channel.pathname,
1652 msg.u.snapshot_channel.relayd_id,
d07ceecd 1653 msg.u.snapshot_channel.nb_packets_per_stream,
10a50311
JD
1654 ctx);
1655 if (ret < 0) {
1656 ERR("Snapshot channel failed");
e462382a 1657 ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL;
10a50311
JD
1658 }
1659 }
1660
9ce5646a 1661 health_code_update();
6dc3064a
DG
1662 ret = consumer_send_status_msg(sock, ret_code);
1663 if (ret < 0) {
1664 /* Somehow, the session daemon is not responding anymore. */
1665 goto end_nosignal;
1666 }
9ce5646a 1667 health_code_update();
6dc3064a
DG
1668 break;
1669 }
3bd1e081
MD
1670 default:
1671 break;
1672 }
3f8e211f 1673
3bd1e081 1674end_nosignal:
b0b335c8 1675 rcu_read_unlock();
4cbc1a04 1676
9ce5646a
MD
1677 health_code_update();
1678
4cbc1a04
DG
1679 /*
1680 * Return 1 to indicate success since the 0 value can be a socket
1681 * shutdown during the recv() or send() call.
1682 */
1683 return 1;
ffe60014
DG
1684
1685end_msg_sessiond:
1686 /*
1687 * The returned value here is not useful since either way we'll return 1 to
1688 * the caller because the session daemon socket management is done
1689 * elsewhere. Returning a negative code or 0 will shutdown the consumer.
1690 */
489f70e9
MD
1691 ret = consumer_send_status_msg(sock, ret_code);
1692 if (ret < 0) {
1693 goto error_fatal;
1694 }
ffe60014 1695 rcu_read_unlock();
9ce5646a
MD
1696
1697 health_code_update();
1698
ffe60014
DG
1699 return 1;
1700end_channel_error:
1701 if (channel) {
1702 /*
1703 * Free channel here since no one has a reference to it. We don't
1704 * free after that because a stream can store this pointer.
1705 */
1706 destroy_channel(channel);
1707 }
1708 /* We have to send a status channel message indicating an error. */
1709 ret = consumer_send_status_channel(sock, NULL);
1710 if (ret < 0) {
1711 /* Stop everything if session daemon can not be notified. */
1712 goto error_fatal;
1713 }
1714 rcu_read_unlock();
9ce5646a
MD
1715
1716 health_code_update();
1717
ffe60014
DG
1718 return 1;
1719error_fatal:
1720 rcu_read_unlock();
1721 /* This will issue a consumer stop. */
1722 return -1;
3bd1e081
MD
1723}
1724
ffe60014
DG
1725/*
1726 * Wrapper over the mmap() read offset from ust-ctl library. Since this can be
1727 * compiled out, we isolate it in this library.
1728 */
1729int lttng_ustctl_get_mmap_read_offset(struct lttng_consumer_stream *stream,
1730 unsigned long *off)
3bd1e081 1731{
ffe60014
DG
1732 assert(stream);
1733 assert(stream->ustream);
b5c5fc29 1734
ffe60014 1735 return ustctl_get_mmap_read_offset(stream->ustream, off);
3bd1e081
MD
1736}
1737
ffe60014
DG
1738/*
1739 * Wrapper over the mmap() read offset from ust-ctl library. Since this can be
1740 * compiled out, we isolate it in this library.
1741 */
1742void *lttng_ustctl_get_mmap_base(struct lttng_consumer_stream *stream)
d056b477 1743{
ffe60014
DG
1744 assert(stream);
1745 assert(stream->ustream);
1746
1747 return ustctl_get_mmap_base(stream->ustream);
d056b477
MD
1748}
1749
ffe60014
DG
1750/*
1751 * Take a snapshot for a specific fd
1752 *
1753 * Returns 0 on success, < 0 on error
1754 */
1755int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream)
3bd1e081 1756{
ffe60014
DG
1757 assert(stream);
1758 assert(stream->ustream);
1759
1760 return ustctl_snapshot(stream->ustream);
3bd1e081
MD
1761}
1762
ffe60014
DG
1763/*
1764 * Get the produced position
1765 *
1766 * Returns 0 on success, < 0 on error
1767 */
1768int lttng_ustconsumer_get_produced_snapshot(
1769 struct lttng_consumer_stream *stream, unsigned long *pos)
3bd1e081 1770{
ffe60014
DG
1771 assert(stream);
1772 assert(stream->ustream);
1773 assert(pos);
7a57cf92 1774
ffe60014
DG
1775 return ustctl_snapshot_get_produced(stream->ustream, pos);
1776}
7a57cf92 1777
10a50311
JD
1778/*
1779 * Get the consumed position
1780 *
1781 * Returns 0 on success, < 0 on error
1782 */
1783int lttng_ustconsumer_get_consumed_snapshot(
1784 struct lttng_consumer_stream *stream, unsigned long *pos)
1785{
1786 assert(stream);
1787 assert(stream->ustream);
1788 assert(pos);
1789
1790 return ustctl_snapshot_get_consumed(stream->ustream, pos);
1791}
1792
84a182ce
DG
1793void lttng_ustconsumer_flush_buffer(struct lttng_consumer_stream *stream,
1794 int producer)
1795{
1796 assert(stream);
1797 assert(stream->ustream);
1798
1799 ustctl_flush_buffer(stream->ustream, producer);
1800}
1801
1802int lttng_ustconsumer_get_current_timestamp(
1803 struct lttng_consumer_stream *stream, uint64_t *ts)
1804{
1805 assert(stream);
1806 assert(stream->ustream);
1807 assert(ts);
1808
1809 return ustctl_get_current_timestamp(stream->ustream, ts);
1810}
1811
ffe60014
DG
1812/*
1813 * Called when the stream signal the consumer that it has hang up.
1814 */
1815void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream)
1816{
1817 assert(stream);
1818 assert(stream->ustream);
2c1dd183 1819
ffe60014
DG
1820 ustctl_flush_buffer(stream->ustream, 0);
1821 stream->hangup_flush_done = 1;
1822}
ee77a7b0 1823
ffe60014
DG
1824void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan)
1825{
4628484a
MD
1826 int i;
1827
ffe60014
DG
1828 assert(chan);
1829 assert(chan->uchan);
e316aad5 1830
ea88ca2a
MD
1831 if (chan->switch_timer_enabled == 1) {
1832 consumer_timer_switch_stop(chan);
1833 }
4628484a
MD
1834 for (i = 0; i < chan->nr_stream_fds; i++) {
1835 int ret;
1836
1837 ret = close(chan->stream_fds[i]);
1838 if (ret) {
1839 PERROR("close");
1840 }
1841 if (chan->shm_path[0]) {
1842 char shm_path[PATH_MAX];
1843
1844 ret = get_stream_shm_path(shm_path, chan->shm_path, i);
1845 if (ret) {
1846 ERR("Cannot get stream shm path");
1847 }
1848 ret = run_as_unlink(shm_path, chan->uid, chan->gid);
1849 if (ret) {
4628484a
MD
1850 PERROR("unlink %s", shm_path);
1851 }
1852 }
1853 }
3d071855
MD
1854 /* Try to rmdir all directories under shm_path root. */
1855 if (chan->root_shm_path[0]) {
4628484a
MD
1856 (void) run_as_recursive_rmdir(chan->root_shm_path,
1857 chan->uid, chan->gid);
3d071855 1858 }
3bd1e081
MD
1859}
1860
b83e03c4
MD
1861void lttng_ustconsumer_free_channel(struct lttng_consumer_channel *chan)
1862{
1863 assert(chan);
1864 assert(chan->uchan);
1865
1866 consumer_metadata_cache_destroy(chan);
1867 ustctl_destroy_channel(chan->uchan);
1868 free(chan->stream_fds);
1869}
1870
3bd1e081
MD
1871void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream)
1872{
ffe60014
DG
1873 assert(stream);
1874 assert(stream->ustream);
d41f73b7 1875
ea88ca2a
MD
1876 if (stream->chan->switch_timer_enabled == 1) {
1877 consumer_timer_switch_stop(stream->chan);
1878 }
ffe60014
DG
1879 ustctl_destroy_stream(stream->ustream);
1880}
d41f73b7 1881
6d574024
DG
1882int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream)
1883{
1884 assert(stream);
1885 assert(stream->ustream);
1886
1887 return ustctl_stream_get_wakeup_fd(stream->ustream);
1888}
1889
1890int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream)
1891{
1892 assert(stream);
1893 assert(stream->ustream);
1894
1895 return ustctl_stream_close_wakeup_fd(stream->ustream);
1896}
1897
309167d2
JD
1898/*
1899 * Populate index values of a UST stream. Values are set in big endian order.
1900 *
1901 * Return 0 on success or else a negative value.
1902 */
50adc264 1903static int get_index_values(struct ctf_packet_index *index,
309167d2
JD
1904 struct ustctl_consumer_stream *ustream)
1905{
1906 int ret;
1907
1908 ret = ustctl_get_timestamp_begin(ustream, &index->timestamp_begin);
1909 if (ret < 0) {
1910 PERROR("ustctl_get_timestamp_begin");
1911 goto error;
1912 }
1913 index->timestamp_begin = htobe64(index->timestamp_begin);
1914
1915 ret = ustctl_get_timestamp_end(ustream, &index->timestamp_end);
1916 if (ret < 0) {
1917 PERROR("ustctl_get_timestamp_end");
1918 goto error;
1919 }
1920 index->timestamp_end = htobe64(index->timestamp_end);
1921
1922 ret = ustctl_get_events_discarded(ustream, &index->events_discarded);
1923 if (ret < 0) {
1924 PERROR("ustctl_get_events_discarded");
1925 goto error;
1926 }
1927 index->events_discarded = htobe64(index->events_discarded);
1928
1929 ret = ustctl_get_content_size(ustream, &index->content_size);
1930 if (ret < 0) {
1931 PERROR("ustctl_get_content_size");
1932 goto error;
1933 }
1934 index->content_size = htobe64(index->content_size);
1935
1936 ret = ustctl_get_packet_size(ustream, &index->packet_size);
1937 if (ret < 0) {
1938 PERROR("ustctl_get_packet_size");
1939 goto error;
1940 }
1941 index->packet_size = htobe64(index->packet_size);
1942
1943 ret = ustctl_get_stream_id(ustream, &index->stream_id);
1944 if (ret < 0) {
1945 PERROR("ustctl_get_stream_id");
1946 goto error;
1947 }
1948 index->stream_id = htobe64(index->stream_id);
1949
1950error:
1951 return ret;
1952}
1953
94d49140
JD
1954/*
1955 * Write up to one packet from the metadata cache to the channel.
1956 *
1957 * Returns the number of bytes pushed in the cache, or a negative value
1958 * on error.
1959 */
1960static
1961int commit_one_metadata_packet(struct lttng_consumer_stream *stream)
1962{
1963 ssize_t write_len;
1964 int ret;
1965
1966 pthread_mutex_lock(&stream->chan->metadata_cache->lock);
c585821b 1967 if (stream->chan->metadata_cache->max_offset
94d49140
JD
1968 == stream->ust_metadata_pushed) {
1969 ret = 0;
1970 goto end;
1971 }
1972
1973 write_len = ustctl_write_one_packet_to_channel(stream->chan->uchan,
1974 &stream->chan->metadata_cache->data[stream->ust_metadata_pushed],
c585821b 1975 stream->chan->metadata_cache->max_offset
94d49140
JD
1976 - stream->ust_metadata_pushed);
1977 assert(write_len != 0);
1978 if (write_len < 0) {
1979 ERR("Writing one metadata packet");
1980 ret = -1;
1981 goto end;
1982 }
1983 stream->ust_metadata_pushed += write_len;
1984
c585821b 1985 assert(stream->chan->metadata_cache->max_offset >=
94d49140
JD
1986 stream->ust_metadata_pushed);
1987 ret = write_len;
1988
1989end:
1990 pthread_mutex_unlock(&stream->chan->metadata_cache->lock);
1991 return ret;
1992}
1993
309167d2 1994
94d49140
JD
1995/*
1996 * Sync metadata meaning request them to the session daemon and snapshot to the
1997 * metadata thread can consumer them.
1998 *
c585821b
MD
1999 * Metadata stream lock is held here, but we need to release it when
2000 * interacting with sessiond, else we cause a deadlock with live
2001 * awaiting on metadata to be pushed out.
94d49140
JD
2002 *
2003 * Return 0 if new metadatda is available, EAGAIN if the metadata stream
2004 * is empty or a negative value on error.
2005 */
2006int lttng_ustconsumer_sync_metadata(struct lttng_consumer_local_data *ctx,
2007 struct lttng_consumer_stream *metadata)
2008{
2009 int ret;
2010 int retry = 0;
2011
2012 assert(ctx);
2013 assert(metadata);
2014
c585821b 2015 pthread_mutex_unlock(&metadata->lock);
94d49140
JD
2016 /*
2017 * Request metadata from the sessiond, but don't wait for the flush
2018 * because we locked the metadata thread.
2019 */
2020 ret = lttng_ustconsumer_request_metadata(ctx, metadata->chan, 0, 0);
2021 if (ret < 0) {
2022 goto end;
2023 }
c585821b 2024 pthread_mutex_lock(&metadata->lock);
94d49140
JD
2025
2026 ret = commit_one_metadata_packet(metadata);
2027 if (ret <= 0) {
2028 goto end;
2029 } else if (ret > 0) {
2030 retry = 1;
2031 }
2032
2033 ustctl_flush_buffer(metadata->ustream, 1);
2034 ret = ustctl_snapshot(metadata->ustream);
2035 if (ret < 0) {
2036 if (errno != EAGAIN) {
2037 ERR("Sync metadata, taking UST snapshot");
2038 goto end;
2039 }
2040 DBG("No new metadata when syncing them.");
2041 /* No new metadata, exit. */
2042 ret = ENODATA;
2043 goto end;
2044 }
2045
2046 /*
2047 * After this flush, we still need to extract metadata.
2048 */
2049 if (retry) {
2050 ret = EAGAIN;
2051 }
2052
2053end:
2054 return ret;
2055}
2056
02b3d176
DG
2057/*
2058 * Return 0 on success else a negative value.
2059 */
2060static int notify_if_more_data(struct lttng_consumer_stream *stream,
2061 struct lttng_consumer_local_data *ctx)
2062{
2063 int ret;
2064 struct ustctl_consumer_stream *ustream;
2065
2066 assert(stream);
2067 assert(ctx);
2068
2069 ustream = stream->ustream;
2070
2071 /*
2072 * First, we are going to check if there is a new subbuffer available
2073 * before reading the stream wait_fd.
2074 */
2075 /* Get the next subbuffer */
2076 ret = ustctl_get_next_subbuf(ustream);
2077 if (ret) {
2078 /* No more data found, flag the stream. */
2079 stream->has_data = 0;
2080 ret = 0;
2081 goto end;
2082 }
2083
5420e5db 2084 ret = ustctl_put_subbuf(ustream);
02b3d176
DG
2085 assert(!ret);
2086
2087 /* This stream still has data. Flag it and wake up the data thread. */
2088 stream->has_data = 1;
2089
2090 if (stream->monitor && !stream->hangup_flush_done && !ctx->has_wakeup) {
2091 ssize_t writelen;
2092
2093 writelen = lttng_pipe_write(ctx->consumer_wakeup_pipe, "!", 1);
2094 if (writelen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) {
2095 ret = writelen;
2096 goto end;
2097 }
2098
2099 /* The wake up pipe has been notified. */
2100 ctx->has_wakeup = 1;
2101 }
2102 ret = 0;
2103
2104end:
2105 return ret;
2106}
2107
94d49140
JD
2108/*
2109 * Read subbuffer from the given stream.
2110 *
2111 * Stream lock MUST be acquired.
2112 *
2113 * Return 0 on success else a negative value.
2114 */
d41f73b7
MD
2115int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream,
2116 struct lttng_consumer_local_data *ctx)
2117{
1d4dfdef 2118 unsigned long len, subbuf_size, padding;
1c20f0e2 2119 int err, write_index = 1;
d41f73b7 2120 long ret = 0;
ffe60014 2121 struct ustctl_consumer_stream *ustream;
50adc264 2122 struct ctf_packet_index index;
ffe60014
DG
2123
2124 assert(stream);
2125 assert(stream->ustream);
2126 assert(ctx);
d41f73b7 2127
3eb914c0 2128 DBG("In UST read_subbuffer (wait_fd: %d, name: %s)", stream->wait_fd,
ffe60014
DG
2129 stream->name);
2130
2131 /* Ease our life for what's next. */
2132 ustream = stream->ustream;
d41f73b7 2133
6cd525e8 2134 /*
02b3d176
DG
2135 * We can consume the 1 byte written into the wait_fd by UST. Don't trigger
2136 * error if we cannot read this one byte (read returns 0), or if the error
2137 * is EAGAIN or EWOULDBLOCK.
2138 *
2139 * This is only done when the stream is monitored by a thread, before the
2140 * flush is done after a hangup and if the stream is not flagged with data
2141 * since there might be nothing to consume in the wait fd but still have
2142 * data available flagged by the consumer wake up pipe.
6cd525e8 2143 */
02b3d176
DG
2144 if (stream->monitor && !stream->hangup_flush_done && !stream->has_data) {
2145 char dummy;
c617c0c6
MD
2146 ssize_t readlen;
2147
6cd525e8
MD
2148 readlen = lttng_read(stream->wait_fd, &dummy, 1);
2149 if (readlen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) {
effcf122
MD
2150 ret = readlen;
2151 goto end;
2152 }
d41f73b7
MD
2153 }
2154
04ef1097 2155retry:
d41f73b7 2156 /* Get the next subbuffer */
ffe60014 2157 err = ustctl_get_next_subbuf(ustream);
d41f73b7 2158 if (err != 0) {
04ef1097
MD
2159 /*
2160 * Populate metadata info if the existing info has
2161 * already been read.
2162 */
2163 if (stream->metadata_flag) {
94d49140
JD
2164 ret = commit_one_metadata_packet(stream);
2165 if (ret <= 0) {
04ef1097
MD
2166 goto end;
2167 }
04ef1097
MD
2168 ustctl_flush_buffer(stream->ustream, 1);
2169 goto retry;
2170 }
2171
1d4dfdef 2172 ret = err; /* ustctl_get_next_subbuf returns negative, caller expect positive. */
d41f73b7
MD
2173 /*
2174 * This is a debug message even for single-threaded consumer,
2175 * because poll() have more relaxed criterions than get subbuf,
2176 * so get_subbuf may fail for short race windows where poll()
2177 * would issue wakeups.
2178 */
2179 DBG("Reserving sub buffer failed (everything is normal, "
ffe60014 2180 "it is due to concurrency) [ret: %d]", err);
d41f73b7
MD
2181 goto end;
2182 }
ffe60014 2183 assert(stream->chan->output == CONSUMER_CHANNEL_MMAP);
309167d2 2184
1c20f0e2 2185 if (!stream->metadata_flag) {
309167d2
JD
2186 index.offset = htobe64(stream->out_fd_offset);
2187 ret = get_index_values(&index, ustream);
2188 if (ret < 0) {
2189 goto end;
2190 }
1c20f0e2
JD
2191 } else {
2192 write_index = 0;
309167d2
JD
2193 }
2194
1d4dfdef 2195 /* Get the full padded subbuffer size */
ffe60014 2196 err = ustctl_get_padded_subbuf_size(ustream, &len);
effcf122 2197 assert(err == 0);
1d4dfdef
DG
2198
2199 /* Get subbuffer data size (without padding) */
ffe60014 2200 err = ustctl_get_subbuf_size(ustream, &subbuf_size);
1d4dfdef
DG
2201 assert(err == 0);
2202
2203 /* Make sure we don't get a subbuffer size bigger than the padded */
2204 assert(len >= subbuf_size);
2205
2206 padding = len - subbuf_size;
d41f73b7 2207 /* write the subbuffer to the tracefile */
309167d2 2208 ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, padding, &index);
91dfef6e
DG
2209 /*
2210 * The mmap operation should write subbuf_size amount of data when network
2211 * streaming or the full padding (len) size when we are _not_ streaming.
2212 */
d88aee68
DG
2213 if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) ||
2214 (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) {
d41f73b7 2215 /*
91dfef6e 2216 * Display the error but continue processing to try to release the
c5c45efa
DG
2217 * subbuffer. This is a DBG statement since any unexpected kill or
2218 * signal, the application gets unregistered, relayd gets closed or
2219 * anything that affects the buffer lifetime will trigger this error.
2220 * So, for the sake of the user, don't print this error since it can
2221 * happen and it is OK with the code flow.
d41f73b7 2222 */
c5c45efa 2223 DBG("Error writing to tracefile "
8fd623e0 2224 "(ret: %ld != len: %lu != subbuf_size: %lu)",
91dfef6e 2225 ret, len, subbuf_size);
309167d2 2226 write_index = 0;
d41f73b7 2227 }
ffe60014 2228 err = ustctl_put_next_subbuf(ustream);
effcf122 2229 assert(err == 0);
331744e3 2230
02b3d176
DG
2231 /*
2232 * This will consumer the byte on the wait_fd if and only if there is not
2233 * next subbuffer to be acquired.
2234 */
2235 if (!stream->metadata_flag) {
2236 ret = notify_if_more_data(stream, ctx);
2237 if (ret < 0) {
2238 goto end;
2239 }
2240 }
2241
309167d2 2242 /* Write index if needed. */
1c20f0e2
JD
2243 if (!write_index) {
2244 goto end;
2245 }
2246
94d49140
JD
2247 if (stream->chan->live_timer_interval && !stream->metadata_flag) {
2248 /*
2249 * In live, block until all the metadata is sent.
2250 */
c585821b
MD
2251 pthread_mutex_lock(&stream->metadata_timer_lock);
2252 assert(!stream->missed_metadata_flush);
2253 stream->waiting_on_metadata = true;
2254 pthread_mutex_unlock(&stream->metadata_timer_lock);
2255
94d49140 2256 err = consumer_stream_sync_metadata(ctx, stream->session_id);
c585821b
MD
2257
2258 pthread_mutex_lock(&stream->metadata_timer_lock);
2259 stream->waiting_on_metadata = false;
2260 if (stream->missed_metadata_flush) {
2261 stream->missed_metadata_flush = false;
2262 pthread_mutex_unlock(&stream->metadata_timer_lock);
2263 (void) consumer_flush_ust_index(stream);
2264 } else {
2265 pthread_mutex_unlock(&stream->metadata_timer_lock);
2266 }
2267
94d49140
JD
2268 if (err < 0) {
2269 goto end;
2270 }
2271 }
2272
1c20f0e2
JD
2273 assert(!stream->metadata_flag);
2274 err = consumer_stream_write_index(stream, &index);
2275 if (err < 0) {
2276 goto end;
309167d2
JD
2277 }
2278
d41f73b7
MD
2279end:
2280 return ret;
2281}
2282
ffe60014
DG
2283/*
2284 * Called when a stream is created.
fe4477ee
JD
2285 *
2286 * Return 0 on success or else a negative value.
ffe60014 2287 */
d41f73b7
MD
2288int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream)
2289{
fe4477ee
JD
2290 int ret;
2291
10a50311
JD
2292 assert(stream);
2293
fe4477ee 2294 /* Don't create anything if this is set for streaming. */
10a50311 2295 if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) {
fe4477ee
JD
2296 ret = utils_create_stream_file(stream->chan->pathname, stream->name,
2297 stream->chan->tracefile_size, stream->tracefile_count_current,
309167d2 2298 stream->uid, stream->gid, NULL);
fe4477ee
JD
2299 if (ret < 0) {
2300 goto error;
2301 }
2302 stream->out_fd = ret;
2303 stream->tracefile_size_current = 0;
309167d2
JD
2304
2305 if (!stream->metadata_flag) {
2306 ret = index_create_file(stream->chan->pathname,
2307 stream->name, stream->uid, stream->gid,
2308 stream->chan->tracefile_size,
2309 stream->tracefile_count_current);
2310 if (ret < 0) {
2311 goto error;
2312 }
2313 stream->index_fd = ret;
2314 }
fe4477ee
JD
2315 }
2316 ret = 0;
2317
2318error:
2319 return ret;
d41f73b7 2320}
ca22feea
DG
2321
2322/*
2323 * Check if data is still being extracted from the buffers for a specific
4e9a4686
DG
2324 * stream. Consumer data lock MUST be acquired before calling this function
2325 * and the stream lock.
ca22feea 2326 *
6d805429 2327 * Return 1 if the traced data are still getting read else 0 meaning that the
ca22feea
DG
2328 * data is available for trace viewer reading.
2329 */
6d805429 2330int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream)
ca22feea
DG
2331{
2332 int ret;
2333
2334 assert(stream);
ffe60014 2335 assert(stream->ustream);
ca22feea 2336
6d805429 2337 DBG("UST consumer checking data pending");
c8f59ee5 2338
ca6b395f
MD
2339 if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) {
2340 ret = 0;
2341 goto end;
2342 }
2343
04ef1097 2344 if (stream->chan->type == CONSUMER_CHANNEL_TYPE_METADATA) {
e6ee4eab
DG
2345 uint64_t contiguous, pushed;
2346
2347 /* Ease our life a bit. */
c585821b 2348 contiguous = stream->chan->metadata_cache->max_offset;
e6ee4eab
DG
2349 pushed = stream->ust_metadata_pushed;
2350
04ef1097
MD
2351 /*
2352 * We can simply check whether all contiguously available data
2353 * has been pushed to the ring buffer, since the push operation
2354 * is performed within get_next_subbuf(), and because both
2355 * get_next_subbuf() and put_next_subbuf() are issued atomically
2356 * thanks to the stream lock within
2357 * lttng_ustconsumer_read_subbuffer(). This basically means that
2358 * whetnever ust_metadata_pushed is incremented, the associated
2359 * metadata has been consumed from the metadata stream.
2360 */
2361 DBG("UST consumer metadata pending check: contiguous %" PRIu64 " vs pushed %" PRIu64,
e6ee4eab 2362 contiguous, pushed);
aa01b94c 2363 assert(((int64_t) (contiguous - pushed)) >= 0);
e6ee4eab 2364 if ((contiguous != pushed) ||
6acdf328 2365 (((int64_t) contiguous - pushed) > 0 || contiguous == 0)) {
04ef1097
MD
2366 ret = 1; /* Data is pending */
2367 goto end;
2368 }
2369 } else {
2370 ret = ustctl_get_next_subbuf(stream->ustream);
2371 if (ret == 0) {
2372 /*
2373 * There is still data so let's put back this
2374 * subbuffer.
2375 */
2376 ret = ustctl_put_subbuf(stream->ustream);
2377 assert(ret == 0);
2378 ret = 1; /* Data is pending */
2379 goto end;
2380 }
ca22feea
DG
2381 }
2382
6d805429
DG
2383 /* Data is NOT pending so ready to be read. */
2384 ret = 0;
ca22feea 2385
6efae65e
DG
2386end:
2387 return ret;
ca22feea 2388}
d88aee68 2389
6d574024
DG
2390/*
2391 * Stop a given metadata channel timer if enabled and close the wait fd which
2392 * is the poll pipe of the metadata stream.
2393 *
2394 * This MUST be called with the metadata channel acquired.
2395 */
2396void lttng_ustconsumer_close_metadata(struct lttng_consumer_channel *metadata)
2397{
2398 int ret;
2399
2400 assert(metadata);
2401 assert(metadata->type == CONSUMER_CHANNEL_TYPE_METADATA);
2402
2403 DBG("Closing metadata channel key %" PRIu64, metadata->key);
2404
2405 if (metadata->switch_timer_enabled == 1) {
2406 consumer_timer_switch_stop(metadata);
2407 }
2408
2409 if (!metadata->metadata_stream) {
2410 goto end;
2411 }
2412
2413 /*
2414 * Closing write side so the thread monitoring the stream wakes up if any
2415 * and clean the metadata stream.
2416 */
2417 if (metadata->metadata_stream->ust_metadata_poll_pipe[1] >= 0) {
2418 ret = close(metadata->metadata_stream->ust_metadata_poll_pipe[1]);
2419 if (ret < 0) {
2420 PERROR("closing metadata pipe write side");
2421 }
2422 metadata->metadata_stream->ust_metadata_poll_pipe[1] = -1;
2423 }
2424
2425end:
2426 return;
2427}
2428
d88aee68
DG
2429/*
2430 * Close every metadata stream wait fd of the metadata hash table. This
2431 * function MUST be used very carefully so not to run into a race between the
2432 * metadata thread handling streams and this function closing their wait fd.
2433 *
2434 * For UST, this is used when the session daemon hangs up. Its the metadata
2435 * producer so calling this is safe because we are assured that no state change
2436 * can occur in the metadata thread for the streams in the hash table.
2437 */
6d574024 2438void lttng_ustconsumer_close_all_metadata(struct lttng_ht *metadata_ht)
d88aee68 2439{
d88aee68
DG
2440 struct lttng_ht_iter iter;
2441 struct lttng_consumer_stream *stream;
2442
2443 assert(metadata_ht);
2444 assert(metadata_ht->ht);
2445
2446 DBG("UST consumer closing all metadata streams");
2447
2448 rcu_read_lock();
2449 cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream,
2450 node.node) {
9ce5646a
MD
2451
2452 health_code_update();
2453
be2b50c7 2454 pthread_mutex_lock(&stream->chan->lock);
6d574024 2455 lttng_ustconsumer_close_metadata(stream->chan);
be2b50c7
DG
2456 pthread_mutex_unlock(&stream->chan->lock);
2457
d88aee68
DG
2458 }
2459 rcu_read_unlock();
2460}
d8ef542d
MD
2461
2462void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream)
2463{
2464 int ret;
2465
2466 ret = ustctl_stream_close_wakeup_fd(stream->ustream);
2467 if (ret < 0) {
2468 ERR("Unable to close wakeup fd");
2469 }
2470}
331744e3 2471
f666ae70
MD
2472/*
2473 * Please refer to consumer-timer.c before adding any lock within this
2474 * function or any of its callees. Timers have a very strict locking
2475 * semantic with respect to teardown. Failure to respect this semantic
2476 * introduces deadlocks.
c585821b
MD
2477 *
2478 * DON'T hold the metadata lock when calling this function, else this
2479 * can cause deadlock involving consumer awaiting for metadata to be
2480 * pushed out due to concurrent interaction with the session daemon.
f666ae70 2481 */
331744e3 2482int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx,
94d49140 2483 struct lttng_consumer_channel *channel, int timer, int wait)
331744e3
JD
2484{
2485 struct lttcomm_metadata_request_msg request;
2486 struct lttcomm_consumer_msg msg;
0c759fc9 2487 enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS;
331744e3
JD
2488 uint64_t len, key, offset;
2489 int ret;
2490
2491 assert(channel);
2492 assert(channel->metadata_cache);
2493
53efb85a
MD
2494 memset(&request, 0, sizeof(request));
2495
331744e3
JD
2496 /* send the metadata request to sessiond */
2497 switch (consumer_data.type) {
2498 case LTTNG_CONSUMER64_UST:
2499 request.bits_per_long = 64;
2500 break;
2501 case LTTNG_CONSUMER32_UST:
2502 request.bits_per_long = 32;
2503 break;
2504 default:
2505 request.bits_per_long = 0;
2506 break;
2507 }
2508
2509 request.session_id = channel->session_id;
1950109e 2510 request.session_id_per_pid = channel->session_id_per_pid;
567eb353
DG
2511 /*
2512 * Request the application UID here so the metadata of that application can
2513 * be sent back. The channel UID corresponds to the user UID of the session
2514 * used for the rights on the stream file(s).
2515 */
2516 request.uid = channel->ust_app_uid;
331744e3 2517 request.key = channel->key;
567eb353 2518
1950109e 2519 DBG("Sending metadata request to sessiond, session id %" PRIu64
567eb353
DG
2520 ", per-pid %" PRIu64 ", app UID %u and channek key %" PRIu64,
2521 request.session_id, request.session_id_per_pid, request.uid,
2522 request.key);
331744e3 2523
75d83e50 2524 pthread_mutex_lock(&ctx->metadata_socket_lock);
9ce5646a
MD
2525
2526 health_code_update();
2527
331744e3
JD
2528 ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request,
2529 sizeof(request));
2530 if (ret < 0) {
2531 ERR("Asking metadata to sessiond");
2532 goto end;
2533 }
2534
9ce5646a
MD
2535 health_code_update();
2536
331744e3
JD
2537 /* Receive the metadata from sessiond */
2538 ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg,
2539 sizeof(msg));
2540 if (ret != sizeof(msg)) {
8fd623e0 2541 DBG("Consumer received unexpected message size %d (expects %zu)",
331744e3
JD
2542 ret, sizeof(msg));
2543 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD);
2544 /*
2545 * The ret value might 0 meaning an orderly shutdown but this is ok
2546 * since the caller handles this.
2547 */
2548 goto end;
2549 }
2550
9ce5646a
MD
2551 health_code_update();
2552
331744e3
JD
2553 if (msg.cmd_type == LTTNG_ERR_UND) {
2554 /* No registry found */
2555 (void) consumer_send_status_msg(ctx->consumer_metadata_socket,
2556 ret_code);
2557 ret = 0;
2558 goto end;
2559 } else if (msg.cmd_type != LTTNG_CONSUMER_PUSH_METADATA) {
2560 ERR("Unexpected cmd_type received %d", msg.cmd_type);
2561 ret = -1;
2562 goto end;
2563 }
2564
2565 len = msg.u.push_metadata.len;
2566 key = msg.u.push_metadata.key;
2567 offset = msg.u.push_metadata.target_offset;
2568
2569 assert(key == channel->key);
2570 if (len == 0) {
2571 DBG("No new metadata to receive for key %" PRIu64, key);
2572 }
2573
9ce5646a
MD
2574 health_code_update();
2575
331744e3
JD
2576 /* Tell session daemon we are ready to receive the metadata. */
2577 ret = consumer_send_status_msg(ctx->consumer_metadata_socket,
0c759fc9 2578 LTTCOMM_CONSUMERD_SUCCESS);
331744e3
JD
2579 if (ret < 0 || len == 0) {
2580 /*
2581 * Somehow, the session daemon is not responding anymore or there is
2582 * nothing to receive.
2583 */
2584 goto end;
2585 }
2586
9ce5646a
MD
2587 health_code_update();
2588
1eb682be 2589 ret = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket,
94d49140 2590 key, offset, len, channel, timer, wait);
1eb682be 2591 if (ret >= 0) {
f2a444f1
DG
2592 /*
2593 * Only send the status msg if the sessiond is alive meaning a positive
2594 * ret code.
2595 */
1eb682be 2596 (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret);
f2a444f1 2597 }
331744e3
JD
2598 ret = 0;
2599
2600end:
9ce5646a
MD
2601 health_code_update();
2602
75d83e50 2603 pthread_mutex_unlock(&ctx->metadata_socket_lock);
331744e3
JD
2604 return ret;
2605}
70190e1c
DG
2606
2607/*
2608 * Return the ustctl call for the get stream id.
2609 */
2610int lttng_ustconsumer_get_stream_id(struct lttng_consumer_stream *stream,
2611 uint64_t *stream_id)
2612{
2613 assert(stream);
2614 assert(stream_id);
2615
2616 return ustctl_get_stream_id(stream->ustream, stream_id);
2617}
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