Commit | Line | Data |
---|---|---|
3bd1e081 | 1 | /* |
ab5be9fa MJ |
2 | * Copyright (C) 2011 Julien Desfossez <julien.desfossez@polymtl.ca> |
3 | * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
3bd1e081 | 5 | * |
ab5be9fa | 6 | * SPDX-License-Identifier: GPL-2.0-only |
3bd1e081 | 7 | * |
3bd1e081 MD |
8 | */ |
9 | ||
276cd1d7 | 10 | #include <stdint.h> |
6c1c0768 | 11 | #define _LGPL_SOURCE |
3bd1e081 | 12 | #include <assert.h> |
f02e1e8a | 13 | #include <lttng/ust-ctl.h> |
3bd1e081 MD |
14 | #include <poll.h> |
15 | #include <pthread.h> | |
16 | #include <stdlib.h> | |
17 | #include <string.h> | |
18 | #include <sys/mman.h> | |
19 | #include <sys/socket.h> | |
dbb5dfe6 | 20 | #include <sys/stat.h> |
3bd1e081 | 21 | #include <sys/types.h> |
77c7c900 | 22 | #include <inttypes.h> |
3bd1e081 | 23 | #include <unistd.h> |
ffe60014 | 24 | #include <urcu/list.h> |
331744e3 | 25 | #include <signal.h> |
02d02e31 | 26 | #include <stdbool.h> |
0857097f | 27 | |
51a9e1c7 | 28 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 29 | #include <common/common.h> |
10a8a223 | 30 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 31 | #include <common/relayd/relayd.h> |
dbb5dfe6 | 32 | #include <common/compat/fcntl.h> |
f263b7fd | 33 | #include <common/compat/endian.h> |
c8fea79c JR |
34 | #include <common/consumer/consumer-metadata-cache.h> |
35 | #include <common/consumer/consumer-stream.h> | |
36 | #include <common/consumer/consumer-timer.h> | |
fe4477ee | 37 | #include <common/utils.h> |
309167d2 | 38 | #include <common/index/index.h> |
10a8a223 DG |
39 | |
40 | #include "ust-consumer.h" | |
3bd1e081 | 41 | |
45863397 | 42 | #define INT_MAX_STR_LEN 12 /* includes \0 */ |
4628484a | 43 | |
3bd1e081 MD |
44 | extern struct lttng_consumer_global_data consumer_data; |
45 | extern int consumer_poll_timeout; | |
3bd1e081 MD |
46 | |
47 | /* | |
ffe60014 DG |
48 | * Free channel object and all streams associated with it. This MUST be used |
49 | * only and only if the channel has _NEVER_ been added to the global channel | |
50 | * hash table. | |
3bd1e081 | 51 | */ |
ffe60014 | 52 | static void destroy_channel(struct lttng_consumer_channel *channel) |
3bd1e081 | 53 | { |
ffe60014 DG |
54 | struct lttng_consumer_stream *stream, *stmp; |
55 | ||
56 | assert(channel); | |
57 | ||
58 | DBG("UST consumer cleaning stream list"); | |
59 | ||
60 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
61 | send_node) { | |
9ce5646a MD |
62 | |
63 | health_code_update(); | |
64 | ||
ffe60014 DG |
65 | cds_list_del(&stream->send_node); |
66 | ustctl_destroy_stream(stream->ustream); | |
d2956687 | 67 | lttng_trace_chunk_put(stream->trace_chunk); |
ffe60014 DG |
68 | free(stream); |
69 | } | |
70 | ||
71 | /* | |
72 | * If a channel is available meaning that was created before the streams | |
73 | * were, delete it. | |
74 | */ | |
75 | if (channel->uchan) { | |
76 | lttng_ustconsumer_del_channel(channel); | |
b83e03c4 | 77 | lttng_ustconsumer_free_channel(channel); |
ffe60014 DG |
78 | } |
79 | free(channel); | |
80 | } | |
3bd1e081 MD |
81 | |
82 | /* | |
ffe60014 | 83 | * Add channel to internal consumer state. |
3bd1e081 | 84 | * |
ffe60014 | 85 | * Returns 0 on success or else a negative value. |
3bd1e081 | 86 | */ |
ffe60014 DG |
87 | static int add_channel(struct lttng_consumer_channel *channel, |
88 | struct lttng_consumer_local_data *ctx) | |
3bd1e081 MD |
89 | { |
90 | int ret = 0; | |
91 | ||
ffe60014 DG |
92 | assert(channel); |
93 | assert(ctx); | |
94 | ||
95 | if (ctx->on_recv_channel != NULL) { | |
96 | ret = ctx->on_recv_channel(channel); | |
97 | if (ret == 0) { | |
d8ef542d | 98 | ret = consumer_add_channel(channel, ctx); |
ffe60014 DG |
99 | } else if (ret < 0) { |
100 | /* Most likely an ENOMEM. */ | |
101 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
102 | goto error; | |
103 | } | |
104 | } else { | |
d8ef542d | 105 | ret = consumer_add_channel(channel, ctx); |
3bd1e081 MD |
106 | } |
107 | ||
d88aee68 | 108 | DBG("UST consumer channel added (key: %" PRIu64 ")", channel->key); |
ffe60014 DG |
109 | |
110 | error: | |
3bd1e081 MD |
111 | return ret; |
112 | } | |
113 | ||
114 | /* | |
ffe60014 DG |
115 | * Allocate and return a consumer channel object. |
116 | */ | |
117 | static struct lttng_consumer_channel *allocate_channel(uint64_t session_id, | |
d2956687 | 118 | const uint64_t *chunk_id, const char *pathname, const char *name, |
da009f2c | 119 | uint64_t relayd_id, uint64_t key, enum lttng_event_output output, |
2bba9e53 | 120 | uint64_t tracefile_size, uint64_t tracefile_count, |
ecc48a90 | 121 | uint64_t session_id_per_pid, unsigned int monitor, |
d7ba1388 | 122 | unsigned int live_timer_interval, |
3d071855 | 123 | const char *root_shm_path, const char *shm_path) |
ffe60014 DG |
124 | { |
125 | assert(pathname); | |
126 | assert(name); | |
127 | ||
d2956687 JG |
128 | return consumer_allocate_channel(key, session_id, chunk_id, pathname, |
129 | name, relayd_id, output, tracefile_size, | |
d7ba1388 | 130 | tracefile_count, session_id_per_pid, monitor, |
3d071855 | 131 | live_timer_interval, root_shm_path, shm_path); |
ffe60014 DG |
132 | } |
133 | ||
134 | /* | |
135 | * Allocate and return a consumer stream object. If _alloc_ret is not NULL, the | |
136 | * error value if applicable is set in it else it is kept untouched. | |
3bd1e081 | 137 | * |
ffe60014 | 138 | * Return NULL on error else the newly allocated stream object. |
3bd1e081 | 139 | */ |
ffe60014 DG |
140 | static struct lttng_consumer_stream *allocate_stream(int cpu, int key, |
141 | struct lttng_consumer_channel *channel, | |
d2956687 | 142 | struct lttng_consumer_local_data *ctx, int *_alloc_ret) |
ffe60014 DG |
143 | { |
144 | int alloc_ret; | |
145 | struct lttng_consumer_stream *stream = NULL; | |
146 | ||
147 | assert(channel); | |
148 | assert(ctx); | |
149 | ||
150 | stream = consumer_allocate_stream(channel->key, | |
151 | key, | |
ffe60014 | 152 | channel->name, |
ffe60014 DG |
153 | channel->relayd_id, |
154 | channel->session_id, | |
d2956687 | 155 | channel->trace_chunk, |
ffe60014 DG |
156 | cpu, |
157 | &alloc_ret, | |
4891ece8 | 158 | channel->type, |
d2956687 | 159 | channel->monitor); |
ffe60014 DG |
160 | if (stream == NULL) { |
161 | switch (alloc_ret) { | |
162 | case -ENOENT: | |
163 | /* | |
164 | * We could not find the channel. Can happen if cpu hotplug | |
165 | * happens while tearing down. | |
166 | */ | |
167 | DBG3("Could not find channel"); | |
168 | break; | |
169 | case -ENOMEM: | |
170 | case -EINVAL: | |
171 | default: | |
172 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
173 | break; | |
174 | } | |
175 | goto error; | |
176 | } | |
177 | ||
d9a2e16e | 178 | consumer_stream_update_channel_attributes(stream, channel); |
ffe60014 DG |
179 | stream->chan = channel; |
180 | ||
181 | error: | |
182 | if (_alloc_ret) { | |
183 | *_alloc_ret = alloc_ret; | |
184 | } | |
185 | return stream; | |
186 | } | |
187 | ||
188 | /* | |
189 | * Send the given stream pointer to the corresponding thread. | |
190 | * | |
191 | * Returns 0 on success else a negative value. | |
192 | */ | |
193 | static int send_stream_to_thread(struct lttng_consumer_stream *stream, | |
194 | struct lttng_consumer_local_data *ctx) | |
195 | { | |
dae10966 DG |
196 | int ret; |
197 | struct lttng_pipe *stream_pipe; | |
ffe60014 DG |
198 | |
199 | /* Get the right pipe where the stream will be sent. */ | |
200 | if (stream->metadata_flag) { | |
66d583dc | 201 | consumer_add_metadata_stream(stream); |
dae10966 | 202 | stream_pipe = ctx->consumer_metadata_pipe; |
ffe60014 | 203 | } else { |
66d583dc | 204 | consumer_add_data_stream(stream); |
dae10966 | 205 | stream_pipe = ctx->consumer_data_pipe; |
ffe60014 DG |
206 | } |
207 | ||
5ab66908 MD |
208 | /* |
209 | * From this point on, the stream's ownership has been moved away from | |
a8086cf4 JR |
210 | * the channel and it becomes globally visible. Hence, remove it from |
211 | * the local stream list to prevent the stream from being both local and | |
212 | * global. | |
5ab66908 MD |
213 | */ |
214 | stream->globally_visible = 1; | |
a8086cf4 | 215 | cds_list_del(&stream->send_node); |
5ab66908 | 216 | |
dae10966 | 217 | ret = lttng_pipe_write(stream_pipe, &stream, sizeof(stream)); |
ffe60014 | 218 | if (ret < 0) { |
dae10966 DG |
219 | ERR("Consumer write %s stream to pipe %d", |
220 | stream->metadata_flag ? "metadata" : "data", | |
221 | lttng_pipe_get_writefd(stream_pipe)); | |
5ab66908 MD |
222 | if (stream->metadata_flag) { |
223 | consumer_del_stream_for_metadata(stream); | |
224 | } else { | |
225 | consumer_del_stream_for_data(stream); | |
226 | } | |
a8086cf4 | 227 | goto error; |
ffe60014 | 228 | } |
a8086cf4 | 229 | |
5ab66908 | 230 | error: |
ffe60014 DG |
231 | return ret; |
232 | } | |
233 | ||
4628484a MD |
234 | static |
235 | int get_stream_shm_path(char *stream_shm_path, const char *shm_path, int cpu) | |
236 | { | |
45863397 | 237 | char cpu_nr[INT_MAX_STR_LEN]; /* int max len */ |
4628484a MD |
238 | int ret; |
239 | ||
240 | strncpy(stream_shm_path, shm_path, PATH_MAX); | |
241 | stream_shm_path[PATH_MAX - 1] = '\0'; | |
45863397 | 242 | ret = snprintf(cpu_nr, INT_MAX_STR_LEN, "%i", cpu); |
67f8cb8d MD |
243 | if (ret < 0) { |
244 | PERROR("snprintf"); | |
4628484a MD |
245 | goto end; |
246 | } | |
247 | strncat(stream_shm_path, cpu_nr, | |
248 | PATH_MAX - strlen(stream_shm_path) - 1); | |
249 | ret = 0; | |
250 | end: | |
251 | return ret; | |
252 | } | |
253 | ||
d88aee68 DG |
254 | /* |
255 | * Create streams for the given channel using liblttng-ust-ctl. | |
d2956687 | 256 | * The channel lock must be acquired by the caller. |
d88aee68 DG |
257 | * |
258 | * Return 0 on success else a negative value. | |
259 | */ | |
ffe60014 | 260 | static int create_ust_streams(struct lttng_consumer_channel *channel, |
d2956687 | 261 | struct lttng_consumer_local_data *ctx) |
ffe60014 DG |
262 | { |
263 | int ret, cpu = 0; | |
264 | struct ustctl_consumer_stream *ustream; | |
265 | struct lttng_consumer_stream *stream; | |
d2956687 | 266 | pthread_mutex_t *current_stream_lock = NULL; |
ffe60014 DG |
267 | |
268 | assert(channel); | |
269 | assert(ctx); | |
270 | ||
271 | /* | |
272 | * While a stream is available from ustctl. When NULL is returned, we've | |
273 | * reached the end of the possible stream for the channel. | |
274 | */ | |
275 | while ((ustream = ustctl_create_stream(channel->uchan, cpu))) { | |
276 | int wait_fd; | |
04ef1097 | 277 | int ust_metadata_pipe[2]; |
ffe60014 | 278 | |
9ce5646a MD |
279 | health_code_update(); |
280 | ||
04ef1097 MD |
281 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && channel->monitor) { |
282 | ret = utils_create_pipe_cloexec_nonblock(ust_metadata_pipe); | |
283 | if (ret < 0) { | |
284 | ERR("Create ust metadata poll pipe"); | |
285 | goto error; | |
286 | } | |
287 | wait_fd = ust_metadata_pipe[0]; | |
288 | } else { | |
289 | wait_fd = ustctl_stream_get_wait_fd(ustream); | |
290 | } | |
ffe60014 DG |
291 | |
292 | /* Allocate consumer stream object. */ | |
d2956687 | 293 | stream = allocate_stream(cpu, wait_fd, channel, ctx, &ret); |
ffe60014 DG |
294 | if (!stream) { |
295 | goto error_alloc; | |
296 | } | |
297 | stream->ustream = ustream; | |
298 | /* | |
299 | * Store it so we can save multiple function calls afterwards since | |
300 | * this value is used heavily in the stream threads. This is UST | |
301 | * specific so this is why it's done after allocation. | |
302 | */ | |
303 | stream->wait_fd = wait_fd; | |
304 | ||
b31398bb DG |
305 | /* |
306 | * Increment channel refcount since the channel reference has now been | |
307 | * assigned in the allocation process above. | |
308 | */ | |
10a50311 JD |
309 | if (stream->chan->monitor) { |
310 | uatomic_inc(&stream->chan->refcount); | |
311 | } | |
b31398bb | 312 | |
d2956687 JG |
313 | pthread_mutex_lock(&stream->lock); |
314 | current_stream_lock = &stream->lock; | |
ffe60014 DG |
315 | /* |
316 | * Order is important this is why a list is used. On error, the caller | |
317 | * should clean this list. | |
318 | */ | |
319 | cds_list_add_tail(&stream->send_node, &channel->streams.head); | |
320 | ||
321 | ret = ustctl_get_max_subbuf_size(stream->ustream, | |
322 | &stream->max_sb_size); | |
323 | if (ret < 0) { | |
324 | ERR("ustctl_get_max_subbuf_size failed for stream %s", | |
325 | stream->name); | |
326 | goto error; | |
327 | } | |
328 | ||
329 | /* Do actions once stream has been received. */ | |
330 | if (ctx->on_recv_stream) { | |
331 | ret = ctx->on_recv_stream(stream); | |
332 | if (ret < 0) { | |
333 | goto error; | |
334 | } | |
335 | } | |
336 | ||
d88aee68 | 337 | DBG("UST consumer add stream %s (key: %" PRIu64 ") with relayd id %" PRIu64, |
ffe60014 DG |
338 | stream->name, stream->key, stream->relayd_stream_id); |
339 | ||
340 | /* Set next CPU stream. */ | |
341 | channel->streams.count = ++cpu; | |
d88aee68 DG |
342 | |
343 | /* Keep stream reference when creating metadata. */ | |
344 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) { | |
345 | channel->metadata_stream = stream; | |
8de4f941 JG |
346 | if (channel->monitor) { |
347 | /* Set metadata poll pipe if we created one */ | |
348 | memcpy(stream->ust_metadata_poll_pipe, | |
349 | ust_metadata_pipe, | |
350 | sizeof(ust_metadata_pipe)); | |
351 | } | |
d88aee68 | 352 | } |
d2956687 JG |
353 | pthread_mutex_unlock(&stream->lock); |
354 | current_stream_lock = NULL; | |
ffe60014 DG |
355 | } |
356 | ||
357 | return 0; | |
358 | ||
359 | error: | |
360 | error_alloc: | |
d2956687 JG |
361 | if (current_stream_lock) { |
362 | pthread_mutex_unlock(current_stream_lock); | |
363 | } | |
ffe60014 DG |
364 | return ret; |
365 | } | |
366 | ||
4628484a MD |
367 | /* |
368 | * create_posix_shm is never called concurrently within a process. | |
369 | */ | |
370 | static | |
371 | int create_posix_shm(void) | |
372 | { | |
373 | char tmp_name[NAME_MAX]; | |
374 | int shmfd, ret; | |
375 | ||
376 | ret = snprintf(tmp_name, NAME_MAX, "/ust-shm-consumer-%d", getpid()); | |
377 | if (ret < 0) { | |
378 | PERROR("snprintf"); | |
379 | return -1; | |
380 | } | |
381 | /* | |
382 | * Allocate shm, and immediately unlink its shm oject, keeping | |
383 | * only the file descriptor as a reference to the object. | |
384 | * We specifically do _not_ use the / at the beginning of the | |
385 | * pathname so that some OS implementations can keep it local to | |
386 | * the process (POSIX leaves this implementation-defined). | |
387 | */ | |
388 | shmfd = shm_open(tmp_name, O_CREAT | O_EXCL | O_RDWR, 0700); | |
389 | if (shmfd < 0) { | |
390 | PERROR("shm_open"); | |
391 | goto error_shm_open; | |
392 | } | |
393 | ret = shm_unlink(tmp_name); | |
394 | if (ret < 0 && errno != ENOENT) { | |
395 | PERROR("shm_unlink"); | |
396 | goto error_shm_release; | |
397 | } | |
398 | return shmfd; | |
399 | ||
400 | error_shm_release: | |
401 | ret = close(shmfd); | |
402 | if (ret) { | |
403 | PERROR("close"); | |
404 | } | |
405 | error_shm_open: | |
406 | return -1; | |
407 | } | |
408 | ||
d2956687 JG |
409 | static int open_ust_stream_fd(struct lttng_consumer_channel *channel, int cpu, |
410 | const struct lttng_credentials *session_credentials) | |
4628484a MD |
411 | { |
412 | char shm_path[PATH_MAX]; | |
413 | int ret; | |
414 | ||
415 | if (!channel->shm_path[0]) { | |
416 | return create_posix_shm(); | |
417 | } | |
418 | ret = get_stream_shm_path(shm_path, channel->shm_path, cpu); | |
419 | if (ret) { | |
420 | goto error_shm_path; | |
421 | } | |
422 | return run_as_open(shm_path, | |
423 | O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR, | |
d2956687 | 424 | session_credentials->uid, session_credentials->gid); |
4628484a MD |
425 | |
426 | error_shm_path: | |
427 | return -1; | |
428 | } | |
429 | ||
ffe60014 DG |
430 | /* |
431 | * Create an UST channel with the given attributes and send it to the session | |
432 | * daemon using the ust ctl API. | |
433 | * | |
434 | * Return 0 on success or else a negative value. | |
435 | */ | |
4628484a MD |
436 | static int create_ust_channel(struct lttng_consumer_channel *channel, |
437 | struct ustctl_consumer_channel_attr *attr, | |
438 | struct ustctl_consumer_channel **ust_chanp) | |
ffe60014 | 439 | { |
4628484a MD |
440 | int ret, nr_stream_fds, i, j; |
441 | int *stream_fds; | |
442 | struct ustctl_consumer_channel *ust_channel; | |
ffe60014 | 443 | |
4628484a | 444 | assert(channel); |
ffe60014 | 445 | assert(attr); |
4628484a | 446 | assert(ust_chanp); |
d2956687 | 447 | assert(channel->buffer_credentials.is_set); |
ffe60014 DG |
448 | |
449 | DBG3("Creating channel to ustctl with attr: [overwrite: %d, " | |
450 | "subbuf_size: %" PRIu64 ", num_subbuf: %" PRIu64 ", " | |
451 | "switch_timer_interval: %u, read_timer_interval: %u, " | |
452 | "output: %d, type: %d", attr->overwrite, attr->subbuf_size, | |
453 | attr->num_subbuf, attr->switch_timer_interval, | |
454 | attr->read_timer_interval, attr->output, attr->type); | |
455 | ||
4628484a MD |
456 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) |
457 | nr_stream_fds = 1; | |
458 | else | |
459 | nr_stream_fds = ustctl_get_nr_stream_per_channel(); | |
460 | stream_fds = zmalloc(nr_stream_fds * sizeof(*stream_fds)); | |
461 | if (!stream_fds) { | |
462 | ret = -1; | |
463 | goto error_alloc; | |
464 | } | |
465 | for (i = 0; i < nr_stream_fds; i++) { | |
d2956687 JG |
466 | stream_fds[i] = open_ust_stream_fd(channel, i, |
467 | &channel->buffer_credentials.value); | |
4628484a MD |
468 | if (stream_fds[i] < 0) { |
469 | ret = -1; | |
470 | goto error_open; | |
471 | } | |
472 | } | |
473 | ust_channel = ustctl_create_channel(attr, stream_fds, nr_stream_fds); | |
474 | if (!ust_channel) { | |
ffe60014 DG |
475 | ret = -1; |
476 | goto error_create; | |
477 | } | |
4628484a MD |
478 | channel->nr_stream_fds = nr_stream_fds; |
479 | channel->stream_fds = stream_fds; | |
480 | *ust_chanp = ust_channel; | |
ffe60014 DG |
481 | |
482 | return 0; | |
483 | ||
484 | error_create: | |
4628484a MD |
485 | error_open: |
486 | for (j = i - 1; j >= 0; j--) { | |
487 | int closeret; | |
488 | ||
489 | closeret = close(stream_fds[j]); | |
490 | if (closeret) { | |
491 | PERROR("close"); | |
492 | } | |
493 | if (channel->shm_path[0]) { | |
494 | char shm_path[PATH_MAX]; | |
495 | ||
496 | closeret = get_stream_shm_path(shm_path, | |
497 | channel->shm_path, j); | |
498 | if (closeret) { | |
499 | ERR("Cannot get stream shm path"); | |
500 | } | |
501 | closeret = run_as_unlink(shm_path, | |
d2956687 JG |
502 | channel->buffer_credentials.value.uid, |
503 | channel->buffer_credentials.value.gid); | |
4628484a | 504 | if (closeret) { |
4628484a MD |
505 | PERROR("unlink %s", shm_path); |
506 | } | |
507 | } | |
508 | } | |
509 | /* Try to rmdir all directories under shm_path root. */ | |
510 | if (channel->root_shm_path[0]) { | |
602766ec | 511 | (void) run_as_rmdir_recursive(channel->root_shm_path, |
d2956687 | 512 | channel->buffer_credentials.value.uid, |
f75c5439 MD |
513 | channel->buffer_credentials.value.gid, |
514 | LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG); | |
4628484a MD |
515 | } |
516 | free(stream_fds); | |
517 | error_alloc: | |
ffe60014 DG |
518 | return ret; |
519 | } | |
520 | ||
d88aee68 DG |
521 | /* |
522 | * Send a single given stream to the session daemon using the sock. | |
523 | * | |
524 | * Return 0 on success else a negative value. | |
525 | */ | |
ffe60014 DG |
526 | static int send_sessiond_stream(int sock, struct lttng_consumer_stream *stream) |
527 | { | |
528 | int ret; | |
529 | ||
530 | assert(stream); | |
531 | assert(sock >= 0); | |
532 | ||
3eb914c0 | 533 | DBG("UST consumer sending stream %" PRIu64 " to sessiond", stream->key); |
ffe60014 DG |
534 | |
535 | /* Send stream to session daemon. */ | |
536 | ret = ustctl_send_stream_to_sessiond(sock, stream->ustream); | |
537 | if (ret < 0) { | |
538 | goto error; | |
539 | } | |
540 | ||
ffe60014 DG |
541 | error: |
542 | return ret; | |
543 | } | |
544 | ||
545 | /* | |
a3a86f35 | 546 | * Send channel to sessiond and relayd if applicable. |
ffe60014 | 547 | * |
d88aee68 | 548 | * Return 0 on success or else a negative value. |
ffe60014 | 549 | */ |
a3a86f35 | 550 | static int send_channel_to_sessiond_and_relayd(int sock, |
ffe60014 DG |
551 | struct lttng_consumer_channel *channel, |
552 | struct lttng_consumer_local_data *ctx, int *relayd_error) | |
553 | { | |
0c759fc9 | 554 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
ffe60014 | 555 | struct lttng_consumer_stream *stream; |
a4baae1b | 556 | uint64_t net_seq_idx = -1ULL; |
ffe60014 DG |
557 | |
558 | assert(channel); | |
559 | assert(ctx); | |
560 | assert(sock >= 0); | |
561 | ||
562 | DBG("UST consumer sending channel %s to sessiond", channel->name); | |
563 | ||
62285ea4 DG |
564 | if (channel->relayd_id != (uint64_t) -1ULL) { |
565 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
566 | |
567 | health_code_update(); | |
568 | ||
62285ea4 | 569 | /* Try to send the stream to the relayd if one is available. */ |
a3a86f35 JG |
570 | DBG("Sending stream %" PRIu64 " of channel \"%s\" to relayd", |
571 | stream->key, channel->name); | |
62285ea4 DG |
572 | ret = consumer_send_relayd_stream(stream, stream->chan->pathname); |
573 | if (ret < 0) { | |
574 | /* | |
575 | * Flag that the relayd was the problem here probably due to a | |
576 | * communicaton error on the socket. | |
577 | */ | |
578 | if (relayd_error) { | |
579 | *relayd_error = 1; | |
580 | } | |
725d28b2 | 581 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
ffe60014 | 582 | } |
a4baae1b JD |
583 | if (net_seq_idx == -1ULL) { |
584 | net_seq_idx = stream->net_seq_idx; | |
585 | } | |
586 | } | |
f2a444f1 | 587 | } |
ffe60014 | 588 | |
f2a444f1 DG |
589 | /* Inform sessiond that we are about to send channel and streams. */ |
590 | ret = consumer_send_status_msg(sock, ret_code); | |
0c759fc9 | 591 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
592 | /* |
593 | * Either the session daemon is not responding or the relayd died so we | |
594 | * stop now. | |
595 | */ | |
596 | goto error; | |
597 | } | |
598 | ||
599 | /* Send channel to sessiond. */ | |
600 | ret = ustctl_send_channel_to_sessiond(sock, channel->uchan); | |
601 | if (ret < 0) { | |
602 | goto error; | |
603 | } | |
604 | ||
605 | ret = ustctl_channel_close_wakeup_fd(channel->uchan); | |
606 | if (ret < 0) { | |
607 | goto error; | |
608 | } | |
609 | ||
610 | /* The channel was sent successfully to the sessiond at this point. */ | |
611 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
612 | |
613 | health_code_update(); | |
614 | ||
ffe60014 DG |
615 | /* Send stream to session daemon. */ |
616 | ret = send_sessiond_stream(sock, stream); | |
617 | if (ret < 0) { | |
618 | goto error; | |
619 | } | |
620 | } | |
621 | ||
622 | /* Tell sessiond there is no more stream. */ | |
623 | ret = ustctl_send_stream_to_sessiond(sock, NULL); | |
624 | if (ret < 0) { | |
625 | goto error; | |
626 | } | |
627 | ||
628 | DBG("UST consumer NULL stream sent to sessiond"); | |
629 | ||
630 | return 0; | |
631 | ||
632 | error: | |
0c759fc9 | 633 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
634 | ret = -1; |
635 | } | |
ffe60014 DG |
636 | return ret; |
637 | } | |
638 | ||
639 | /* | |
640 | * Creates a channel and streams and add the channel it to the channel internal | |
641 | * state. The created stream must ONLY be sent once the GET_CHANNEL command is | |
642 | * received. | |
643 | * | |
644 | * Return 0 on success or else, a negative value is returned and the channel | |
645 | * MUST be destroyed by consumer_del_channel(). | |
646 | */ | |
75cfe9e6 | 647 | static int ask_channel(struct lttng_consumer_local_data *ctx, |
ffe60014 | 648 | struct lttng_consumer_channel *channel, |
d2956687 | 649 | struct ustctl_consumer_channel_attr *attr) |
3bd1e081 MD |
650 | { |
651 | int ret; | |
652 | ||
ffe60014 DG |
653 | assert(ctx); |
654 | assert(channel); | |
655 | assert(attr); | |
656 | ||
657 | /* | |
658 | * This value is still used by the kernel consumer since for the kernel, | |
659 | * the stream ownership is not IN the consumer so we need to have the | |
660 | * number of left stream that needs to be initialized so we can know when | |
661 | * to delete the channel (see consumer.c). | |
662 | * | |
663 | * As for the user space tracer now, the consumer creates and sends the | |
664 | * stream to the session daemon which only sends them to the application | |
665 | * once every stream of a channel is received making this value useless | |
666 | * because we they will be added to the poll thread before the application | |
667 | * receives them. This ensures that a stream can not hang up during | |
668 | * initilization of a channel. | |
669 | */ | |
670 | channel->nb_init_stream_left = 0; | |
671 | ||
672 | /* The reply msg status is handled in the following call. */ | |
4628484a | 673 | ret = create_ust_channel(channel, attr, &channel->uchan); |
ffe60014 | 674 | if (ret < 0) { |
10a50311 | 675 | goto end; |
3bd1e081 MD |
676 | } |
677 | ||
d8ef542d MD |
678 | channel->wait_fd = ustctl_channel_get_wait_fd(channel->uchan); |
679 | ||
10a50311 JD |
680 | /* |
681 | * For the snapshots (no monitor), we create the metadata streams | |
682 | * on demand, not during the channel creation. | |
683 | */ | |
684 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && !channel->monitor) { | |
685 | ret = 0; | |
686 | goto end; | |
687 | } | |
688 | ||
ffe60014 | 689 | /* Open all streams for this channel. */ |
d2956687 JG |
690 | pthread_mutex_lock(&channel->lock); |
691 | ret = create_ust_streams(channel, ctx); | |
692 | pthread_mutex_unlock(&channel->lock); | |
ffe60014 | 693 | if (ret < 0) { |
10a50311 | 694 | goto end; |
ffe60014 DG |
695 | } |
696 | ||
10a50311 | 697 | end: |
3bd1e081 MD |
698 | return ret; |
699 | } | |
700 | ||
d88aee68 DG |
701 | /* |
702 | * Send all stream of a channel to the right thread handling it. | |
703 | * | |
704 | * On error, return a negative value else 0 on success. | |
705 | */ | |
706 | static int send_streams_to_thread(struct lttng_consumer_channel *channel, | |
707 | struct lttng_consumer_local_data *ctx) | |
708 | { | |
709 | int ret = 0; | |
710 | struct lttng_consumer_stream *stream, *stmp; | |
711 | ||
712 | assert(channel); | |
713 | assert(ctx); | |
714 | ||
715 | /* Send streams to the corresponding thread. */ | |
716 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
717 | send_node) { | |
9ce5646a MD |
718 | |
719 | health_code_update(); | |
720 | ||
d88aee68 DG |
721 | /* Sending the stream to the thread. */ |
722 | ret = send_stream_to_thread(stream, ctx); | |
723 | if (ret < 0) { | |
724 | /* | |
725 | * If we are unable to send the stream to the thread, there is | |
726 | * a big problem so just stop everything. | |
727 | */ | |
728 | goto error; | |
729 | } | |
d88aee68 DG |
730 | } |
731 | ||
732 | error: | |
733 | return ret; | |
734 | } | |
735 | ||
7972aab2 DG |
736 | /* |
737 | * Flush channel's streams using the given key to retrieve the channel. | |
738 | * | |
739 | * Return 0 on success else an LTTng error code. | |
740 | */ | |
741 | static int flush_channel(uint64_t chan_key) | |
742 | { | |
743 | int ret = 0; | |
744 | struct lttng_consumer_channel *channel; | |
745 | struct lttng_consumer_stream *stream; | |
746 | struct lttng_ht *ht; | |
747 | struct lttng_ht_iter iter; | |
748 | ||
8fd623e0 | 749 | DBG("UST consumer flush channel key %" PRIu64, chan_key); |
7972aab2 | 750 | |
a500c257 | 751 | rcu_read_lock(); |
7972aab2 DG |
752 | channel = consumer_find_channel(chan_key); |
753 | if (!channel) { | |
8fd623e0 | 754 | ERR("UST consumer flush channel %" PRIu64 " not found", chan_key); |
7972aab2 DG |
755 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
756 | goto error; | |
757 | } | |
758 | ||
759 | ht = consumer_data.stream_per_chan_id_ht; | |
760 | ||
761 | /* For each stream of the channel id, flush it. */ | |
7972aab2 DG |
762 | cds_lfht_for_each_entry_duplicate(ht->ht, |
763 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
764 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
9ce5646a MD |
765 | |
766 | health_code_update(); | |
767 | ||
0dd01979 | 768 | pthread_mutex_lock(&stream->lock); |
5cfcab67 JR |
769 | |
770 | /* | |
771 | * Protect against concurrent teardown of a stream. | |
772 | */ | |
773 | if (cds_lfht_is_node_deleted(&stream->node.node)) { | |
774 | goto next; | |
775 | } | |
776 | ||
0dd01979 MD |
777 | if (!stream->quiescent) { |
778 | ustctl_flush_buffer(stream->ustream, 0); | |
779 | stream->quiescent = true; | |
780 | } | |
5cfcab67 | 781 | next: |
0dd01979 MD |
782 | pthread_mutex_unlock(&stream->lock); |
783 | } | |
784 | error: | |
785 | rcu_read_unlock(); | |
786 | return ret; | |
787 | } | |
788 | ||
789 | /* | |
790 | * Clear quiescent state from channel's streams using the given key to | |
791 | * retrieve the channel. | |
792 | * | |
793 | * Return 0 on success else an LTTng error code. | |
794 | */ | |
795 | static int clear_quiescent_channel(uint64_t chan_key) | |
796 | { | |
797 | int ret = 0; | |
798 | struct lttng_consumer_channel *channel; | |
799 | struct lttng_consumer_stream *stream; | |
800 | struct lttng_ht *ht; | |
801 | struct lttng_ht_iter iter; | |
802 | ||
803 | DBG("UST consumer clear quiescent channel key %" PRIu64, chan_key); | |
804 | ||
805 | rcu_read_lock(); | |
806 | channel = consumer_find_channel(chan_key); | |
807 | if (!channel) { | |
808 | ERR("UST consumer clear quiescent channel %" PRIu64 " not found", chan_key); | |
809 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
810 | goto error; | |
811 | } | |
812 | ||
813 | ht = consumer_data.stream_per_chan_id_ht; | |
814 | ||
815 | /* For each stream of the channel id, clear quiescent state. */ | |
816 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
817 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
818 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
819 | ||
820 | health_code_update(); | |
821 | ||
822 | pthread_mutex_lock(&stream->lock); | |
823 | stream->quiescent = false; | |
824 | pthread_mutex_unlock(&stream->lock); | |
7972aab2 | 825 | } |
7972aab2 | 826 | error: |
a500c257 | 827 | rcu_read_unlock(); |
7972aab2 DG |
828 | return ret; |
829 | } | |
830 | ||
d88aee68 DG |
831 | /* |
832 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. | |
833 | * | |
834 | * Return 0 on success else an LTTng error code. | |
835 | */ | |
836 | static int close_metadata(uint64_t chan_key) | |
837 | { | |
ea88ca2a | 838 | int ret = 0; |
d88aee68 | 839 | struct lttng_consumer_channel *channel; |
f65a74be | 840 | unsigned int channel_monitor; |
d88aee68 | 841 | |
8fd623e0 | 842 | DBG("UST consumer close metadata key %" PRIu64, chan_key); |
d88aee68 DG |
843 | |
844 | channel = consumer_find_channel(chan_key); | |
845 | if (!channel) { | |
84cc9aa0 DG |
846 | /* |
847 | * This is possible if the metadata thread has issue a delete because | |
848 | * the endpoint point of the stream hung up. There is no way the | |
849 | * session daemon can know about it thus use a DBG instead of an actual | |
850 | * error. | |
851 | */ | |
852 | DBG("UST consumer close metadata %" PRIu64 " not found", chan_key); | |
d88aee68 DG |
853 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
854 | goto error; | |
855 | } | |
856 | ||
ea88ca2a | 857 | pthread_mutex_lock(&consumer_data.lock); |
a9838785 | 858 | pthread_mutex_lock(&channel->lock); |
f65a74be | 859 | channel_monitor = channel->monitor; |
73811ecc DG |
860 | if (cds_lfht_is_node_deleted(&channel->node.node)) { |
861 | goto error_unlock; | |
862 | } | |
863 | ||
6d574024 | 864 | lttng_ustconsumer_close_metadata(channel); |
f65a74be JG |
865 | pthread_mutex_unlock(&channel->lock); |
866 | pthread_mutex_unlock(&consumer_data.lock); | |
d88aee68 | 867 | |
f65a74be JG |
868 | /* |
869 | * The ownership of a metadata channel depends on the type of | |
870 | * session to which it belongs. In effect, the monitor flag is checked | |
871 | * to determine if this metadata channel is in "snapshot" mode or not. | |
872 | * | |
873 | * In the non-snapshot case, the metadata channel is created along with | |
874 | * a single stream which will remain present until the metadata channel | |
875 | * is destroyed (on the destruction of its session). In this case, the | |
876 | * metadata stream in "monitored" by the metadata poll thread and holds | |
877 | * the ownership of its channel. | |
878 | * | |
879 | * Closing the metadata will cause the metadata stream's "metadata poll | |
880 | * pipe" to be closed. Closing this pipe will wake-up the metadata poll | |
881 | * thread which will teardown the metadata stream which, in return, | |
882 | * deletes the metadata channel. | |
883 | * | |
884 | * In the snapshot case, the metadata stream is created and destroyed | |
885 | * on every snapshot record. Since the channel doesn't have an owner | |
886 | * other than the session daemon, it is safe to destroy it immediately | |
887 | * on reception of the CLOSE_METADATA command. | |
888 | */ | |
889 | if (!channel_monitor) { | |
890 | /* | |
891 | * The channel and consumer_data locks must be | |
892 | * released before this call since consumer_del_channel | |
893 | * re-acquires the channel and consumer_data locks to teardown | |
894 | * the channel and queue its reclamation by the "call_rcu" | |
895 | * worker thread. | |
896 | */ | |
897 | consumer_del_channel(channel); | |
898 | } | |
899 | ||
900 | return ret; | |
ea88ca2a | 901 | error_unlock: |
a9838785 | 902 | pthread_mutex_unlock(&channel->lock); |
ea88ca2a | 903 | pthread_mutex_unlock(&consumer_data.lock); |
d88aee68 DG |
904 | error: |
905 | return ret; | |
906 | } | |
907 | ||
908 | /* | |
909 | * RCU read side lock MUST be acquired before calling this function. | |
910 | * | |
911 | * Return 0 on success else an LTTng error code. | |
912 | */ | |
913 | static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key) | |
914 | { | |
915 | int ret; | |
916 | struct lttng_consumer_channel *metadata; | |
917 | ||
8fd623e0 | 918 | DBG("UST consumer setup metadata key %" PRIu64, key); |
d88aee68 DG |
919 | |
920 | metadata = consumer_find_channel(key); | |
921 | if (!metadata) { | |
922 | ERR("UST consumer push metadata %" PRIu64 " not found", key); | |
923 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
10a50311 JD |
924 | goto end; |
925 | } | |
926 | ||
927 | /* | |
928 | * In no monitor mode, the metadata channel has no stream(s) so skip the | |
929 | * ownership transfer to the metadata thread. | |
930 | */ | |
931 | if (!metadata->monitor) { | |
932 | DBG("Metadata channel in no monitor"); | |
933 | ret = 0; | |
934 | goto end; | |
d88aee68 DG |
935 | } |
936 | ||
937 | /* | |
938 | * Send metadata stream to relayd if one available. Availability is | |
939 | * known if the stream is still in the list of the channel. | |
940 | */ | |
941 | if (cds_list_empty(&metadata->streams.head)) { | |
942 | ERR("Metadata channel key %" PRIu64 ", no stream available.", key); | |
943 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
f5a0c9cf | 944 | goto error_no_stream; |
d88aee68 DG |
945 | } |
946 | ||
947 | /* Send metadata stream to relayd if needed. */ | |
62285ea4 DG |
948 | if (metadata->metadata_stream->net_seq_idx != (uint64_t) -1ULL) { |
949 | ret = consumer_send_relayd_stream(metadata->metadata_stream, | |
950 | metadata->pathname); | |
951 | if (ret < 0) { | |
952 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
953 | goto error; | |
954 | } | |
601262d6 JD |
955 | ret = consumer_send_relayd_streams_sent( |
956 | metadata->metadata_stream->net_seq_idx); | |
957 | if (ret < 0) { | |
958 | ret = LTTCOMM_CONSUMERD_RELAYD_FAIL; | |
959 | goto error; | |
960 | } | |
d88aee68 DG |
961 | } |
962 | ||
a8086cf4 JR |
963 | /* |
964 | * Ownership of metadata stream is passed along. Freeing is handled by | |
965 | * the callee. | |
966 | */ | |
d88aee68 DG |
967 | ret = send_streams_to_thread(metadata, ctx); |
968 | if (ret < 0) { | |
969 | /* | |
970 | * If we are unable to send the stream to the thread, there is | |
971 | * a big problem so just stop everything. | |
972 | */ | |
973 | ret = LTTCOMM_CONSUMERD_FATAL; | |
a8086cf4 | 974 | goto send_streams_error; |
d88aee68 DG |
975 | } |
976 | /* List MUST be empty after or else it could be reused. */ | |
977 | assert(cds_list_empty(&metadata->streams.head)); | |
978 | ||
10a50311 JD |
979 | ret = 0; |
980 | goto end; | |
d88aee68 DG |
981 | |
982 | error: | |
f2a444f1 DG |
983 | /* |
984 | * Delete metadata channel on error. At this point, the metadata stream can | |
985 | * NOT be monitored by the metadata thread thus having the guarantee that | |
986 | * the stream is still in the local stream list of the channel. This call | |
987 | * will make sure to clean that list. | |
988 | */ | |
f5a0c9cf | 989 | consumer_stream_destroy(metadata->metadata_stream, NULL); |
212d67a2 DG |
990 | cds_list_del(&metadata->metadata_stream->send_node); |
991 | metadata->metadata_stream = NULL; | |
a8086cf4 | 992 | send_streams_error: |
f5a0c9cf | 993 | error_no_stream: |
10a50311 JD |
994 | end: |
995 | return ret; | |
996 | } | |
997 | ||
998 | /* | |
999 | * Snapshot the whole metadata. | |
d2956687 | 1000 | * RCU read-side lock must be held by the caller. |
10a50311 JD |
1001 | * |
1002 | * Returns 0 on success, < 0 on error | |
1003 | */ | |
3eb928aa MD |
1004 | static int snapshot_metadata(struct lttng_consumer_channel *metadata_channel, |
1005 | uint64_t key, char *path, uint64_t relayd_id, | |
d2956687 | 1006 | struct lttng_consumer_local_data *ctx) |
10a50311 JD |
1007 | { |
1008 | int ret = 0; | |
10a50311 JD |
1009 | struct lttng_consumer_stream *metadata_stream; |
1010 | ||
1011 | assert(path); | |
1012 | assert(ctx); | |
1013 | ||
1014 | DBG("UST consumer snapshot metadata with key %" PRIu64 " at path %s", | |
1015 | key, path); | |
1016 | ||
1017 | rcu_read_lock(); | |
1018 | ||
10a50311 JD |
1019 | assert(!metadata_channel->monitor); |
1020 | ||
9ce5646a MD |
1021 | health_code_update(); |
1022 | ||
10a50311 JD |
1023 | /* |
1024 | * Ask the sessiond if we have new metadata waiting and update the | |
1025 | * consumer metadata cache. | |
1026 | */ | |
94d49140 | 1027 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 1); |
10a50311 JD |
1028 | if (ret < 0) { |
1029 | goto error; | |
1030 | } | |
1031 | ||
9ce5646a MD |
1032 | health_code_update(); |
1033 | ||
10a50311 JD |
1034 | /* |
1035 | * The metadata stream is NOT created in no monitor mode when the channel | |
1036 | * is created on a sessiond ask channel command. | |
1037 | */ | |
d2956687 | 1038 | ret = create_ust_streams(metadata_channel, ctx); |
10a50311 JD |
1039 | if (ret < 0) { |
1040 | goto error; | |
1041 | } | |
1042 | ||
1043 | metadata_stream = metadata_channel->metadata_stream; | |
1044 | assert(metadata_stream); | |
1045 | ||
d2956687 | 1046 | pthread_mutex_lock(&metadata_stream->lock); |
10a50311 JD |
1047 | if (relayd_id != (uint64_t) -1ULL) { |
1048 | metadata_stream->net_seq_idx = relayd_id; | |
1049 | ret = consumer_send_relayd_stream(metadata_stream, path); | |
10a50311 | 1050 | } else { |
d2956687 JG |
1051 | ret = consumer_stream_create_output_files(metadata_stream, |
1052 | false); | |
1053 | } | |
1054 | pthread_mutex_unlock(&metadata_stream->lock); | |
1055 | if (ret < 0) { | |
1056 | goto error_stream; | |
10a50311 JD |
1057 | } |
1058 | ||
04ef1097 | 1059 | do { |
9ce5646a MD |
1060 | health_code_update(); |
1061 | ||
10a50311 JD |
1062 | ret = lttng_consumer_read_subbuffer(metadata_stream, ctx); |
1063 | if (ret < 0) { | |
94d49140 | 1064 | goto error_stream; |
10a50311 | 1065 | } |
04ef1097 | 1066 | } while (ret > 0); |
10a50311 | 1067 | |
10a50311 JD |
1068 | error_stream: |
1069 | /* | |
1070 | * Clean up the stream completly because the next snapshot will use a new | |
1071 | * metadata stream. | |
1072 | */ | |
10a50311 | 1073 | consumer_stream_destroy(metadata_stream, NULL); |
212d67a2 | 1074 | cds_list_del(&metadata_stream->send_node); |
10a50311 JD |
1075 | metadata_channel->metadata_stream = NULL; |
1076 | ||
1077 | error: | |
1078 | rcu_read_unlock(); | |
1079 | return ret; | |
1080 | } | |
1081 | ||
276cd1d7 JG |
1082 | static |
1083 | int get_current_subbuf_addr(struct lttng_consumer_stream *stream, | |
1084 | const char **addr) | |
1085 | { | |
1086 | int ret; | |
1087 | unsigned long mmap_offset; | |
1088 | const char *mmap_base; | |
1089 | ||
1090 | mmap_base = ustctl_get_mmap_base(stream->ustream); | |
1091 | if (!mmap_base) { | |
1092 | ERR("Failed to get mmap base for stream `%s`", | |
1093 | stream->name); | |
1094 | ret = -EPERM; | |
1095 | goto error; | |
1096 | } | |
1097 | ||
1098 | ret = ustctl_get_mmap_read_offset(stream->ustream, &mmap_offset); | |
1099 | if (ret != 0) { | |
1100 | ERR("Failed to get mmap offset for stream `%s`", stream->name); | |
1101 | ret = -EINVAL; | |
1102 | goto error; | |
1103 | } | |
1104 | ||
1105 | *addr = mmap_base + mmap_offset; | |
1106 | error: | |
1107 | return ret; | |
1108 | ||
1109 | } | |
1110 | ||
10a50311 JD |
1111 | /* |
1112 | * Take a snapshot of all the stream of a channel. | |
d2956687 | 1113 | * RCU read-side lock and the channel lock must be held by the caller. |
10a50311 JD |
1114 | * |
1115 | * Returns 0 on success, < 0 on error | |
1116 | */ | |
3eb928aa MD |
1117 | static int snapshot_channel(struct lttng_consumer_channel *channel, |
1118 | uint64_t key, char *path, uint64_t relayd_id, | |
e098433c JG |
1119 | uint64_t nb_packets_per_stream, |
1120 | struct lttng_consumer_local_data *ctx) | |
10a50311 JD |
1121 | { |
1122 | int ret; | |
1123 | unsigned use_relayd = 0; | |
1124 | unsigned long consumed_pos, produced_pos; | |
10a50311 JD |
1125 | struct lttng_consumer_stream *stream; |
1126 | ||
1127 | assert(path); | |
1128 | assert(ctx); | |
1129 | ||
1130 | rcu_read_lock(); | |
1131 | ||
1132 | if (relayd_id != (uint64_t) -1ULL) { | |
1133 | use_relayd = 1; | |
1134 | } | |
1135 | ||
10a50311 | 1136 | assert(!channel->monitor); |
6a00837f | 1137 | DBG("UST consumer snapshot channel %" PRIu64, key); |
10a50311 JD |
1138 | |
1139 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
1140 | health_code_update(); |
1141 | ||
10a50311 JD |
1142 | /* Lock stream because we are about to change its state. */ |
1143 | pthread_mutex_lock(&stream->lock); | |
d2956687 JG |
1144 | assert(channel->trace_chunk); |
1145 | if (!lttng_trace_chunk_get(channel->trace_chunk)) { | |
1146 | /* | |
1147 | * Can't happen barring an internal error as the channel | |
1148 | * holds a reference to the trace chunk. | |
1149 | */ | |
1150 | ERR("Failed to acquire reference to channel's trace chunk"); | |
1151 | ret = -1; | |
1152 | goto error_unlock; | |
1153 | } | |
1154 | assert(!stream->trace_chunk); | |
1155 | stream->trace_chunk = channel->trace_chunk; | |
1156 | ||
10a50311 JD |
1157 | stream->net_seq_idx = relayd_id; |
1158 | ||
1159 | if (use_relayd) { | |
1160 | ret = consumer_send_relayd_stream(stream, path); | |
1161 | if (ret < 0) { | |
1162 | goto error_unlock; | |
1163 | } | |
1164 | } else { | |
d2956687 JG |
1165 | ret = consumer_stream_create_output_files(stream, |
1166 | false); | |
10a50311 JD |
1167 | if (ret < 0) { |
1168 | goto error_unlock; | |
1169 | } | |
d2956687 JG |
1170 | DBG("UST consumer snapshot stream (%" PRIu64 ")", |
1171 | stream->key); | |
10a50311 JD |
1172 | } |
1173 | ||
d4d80f77 MD |
1174 | /* |
1175 | * If tracing is active, we want to perform a "full" buffer flush. | |
1176 | * Else, if quiescent, it has already been done by the prior stop. | |
1177 | */ | |
1178 | if (!stream->quiescent) { | |
1179 | ustctl_flush_buffer(stream->ustream, 0); | |
1180 | } | |
10a50311 JD |
1181 | |
1182 | ret = lttng_ustconsumer_take_snapshot(stream); | |
1183 | if (ret < 0) { | |
1184 | ERR("Taking UST snapshot"); | |
1185 | goto error_unlock; | |
1186 | } | |
1187 | ||
1188 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); | |
1189 | if (ret < 0) { | |
1190 | ERR("Produced UST snapshot position"); | |
1191 | goto error_unlock; | |
1192 | } | |
1193 | ||
1194 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
1195 | if (ret < 0) { | |
1196 | ERR("Consumerd UST snapshot position"); | |
1197 | goto error_unlock; | |
1198 | } | |
1199 | ||
5c786ded JD |
1200 | /* |
1201 | * The original value is sent back if max stream size is larger than | |
d07ceecd | 1202 | * the possible size of the snapshot. Also, we assume that the session |
5c786ded JD |
1203 | * daemon should never send a maximum stream size that is lower than |
1204 | * subbuffer size. | |
1205 | */ | |
d07ceecd MD |
1206 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
1207 | produced_pos, nb_packets_per_stream, | |
1208 | stream->max_sb_size); | |
5c786ded | 1209 | |
9377d830 | 1210 | while ((long) (consumed_pos - produced_pos) < 0) { |
10a50311 JD |
1211 | ssize_t read_len; |
1212 | unsigned long len, padded_len; | |
276cd1d7 | 1213 | const char *subbuf_addr; |
a587bd64 | 1214 | struct lttng_buffer_view subbuf_view; |
10a50311 | 1215 | |
9ce5646a MD |
1216 | health_code_update(); |
1217 | ||
10a50311 JD |
1218 | DBG("UST consumer taking snapshot at pos %lu", consumed_pos); |
1219 | ||
1220 | ret = ustctl_get_subbuf(stream->ustream, &consumed_pos); | |
1221 | if (ret < 0) { | |
1222 | if (ret != -EAGAIN) { | |
1223 | PERROR("ustctl_get_subbuf snapshot"); | |
1224 | goto error_close_stream; | |
1225 | } | |
1226 | DBG("UST consumer get subbuf failed. Skipping it."); | |
1227 | consumed_pos += stream->max_sb_size; | |
ddc93ee4 | 1228 | stream->chan->lost_packets++; |
10a50311 JD |
1229 | continue; |
1230 | } | |
1231 | ||
1232 | ret = ustctl_get_subbuf_size(stream->ustream, &len); | |
1233 | if (ret < 0) { | |
1234 | ERR("Snapshot ustctl_get_subbuf_size"); | |
1235 | goto error_put_subbuf; | |
1236 | } | |
1237 | ||
1238 | ret = ustctl_get_padded_subbuf_size(stream->ustream, &padded_len); | |
1239 | if (ret < 0) { | |
1240 | ERR("Snapshot ustctl_get_padded_subbuf_size"); | |
1241 | goto error_put_subbuf; | |
1242 | } | |
1243 | ||
276cd1d7 JG |
1244 | ret = get_current_subbuf_addr(stream, &subbuf_addr); |
1245 | if (ret) { | |
1246 | goto error_put_subbuf; | |
1247 | } | |
1248 | ||
a587bd64 JG |
1249 | subbuf_view = lttng_buffer_view_init( |
1250 | subbuf_addr, 0, padded_len); | |
276cd1d7 | 1251 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, |
a587bd64 JG |
1252 | stream, &subbuf_view, padded_len - len, |
1253 | NULL); | |
10a50311 JD |
1254 | if (use_relayd) { |
1255 | if (read_len != len) { | |
56591bac | 1256 | ret = -EPERM; |
10a50311 JD |
1257 | goto error_put_subbuf; |
1258 | } | |
1259 | } else { | |
1260 | if (read_len != padded_len) { | |
56591bac | 1261 | ret = -EPERM; |
10a50311 JD |
1262 | goto error_put_subbuf; |
1263 | } | |
1264 | } | |
1265 | ||
1266 | ret = ustctl_put_subbuf(stream->ustream); | |
1267 | if (ret < 0) { | |
1268 | ERR("Snapshot ustctl_put_subbuf"); | |
1269 | goto error_close_stream; | |
1270 | } | |
1271 | consumed_pos += stream->max_sb_size; | |
1272 | } | |
1273 | ||
1274 | /* Simply close the stream so we can use it on the next snapshot. */ | |
1275 | consumer_stream_close(stream); | |
1276 | pthread_mutex_unlock(&stream->lock); | |
1277 | } | |
1278 | ||
1279 | rcu_read_unlock(); | |
1280 | return 0; | |
1281 | ||
1282 | error_put_subbuf: | |
1283 | if (ustctl_put_subbuf(stream->ustream) < 0) { | |
1284 | ERR("Snapshot ustctl_put_subbuf"); | |
1285 | } | |
1286 | error_close_stream: | |
1287 | consumer_stream_close(stream); | |
1288 | error_unlock: | |
1289 | pthread_mutex_unlock(&stream->lock); | |
10a50311 | 1290 | rcu_read_unlock(); |
d88aee68 DG |
1291 | return ret; |
1292 | } | |
1293 | ||
331744e3 | 1294 | /* |
c585821b MD |
1295 | * Receive the metadata updates from the sessiond. Supports receiving |
1296 | * overlapping metadata, but is needs to always belong to a contiguous | |
1297 | * range starting from 0. | |
1298 | * Be careful about the locks held when calling this function: it needs | |
1299 | * the metadata cache flush to concurrently progress in order to | |
1300 | * complete. | |
331744e3 JD |
1301 | */ |
1302 | int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset, | |
93ec662e JD |
1303 | uint64_t len, uint64_t version, |
1304 | struct lttng_consumer_channel *channel, int timer, int wait) | |
331744e3 | 1305 | { |
0c759fc9 | 1306 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
331744e3 JD |
1307 | char *metadata_str; |
1308 | ||
8fd623e0 | 1309 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len); |
331744e3 JD |
1310 | |
1311 | metadata_str = zmalloc(len * sizeof(char)); | |
1312 | if (!metadata_str) { | |
1313 | PERROR("zmalloc metadata string"); | |
1314 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; | |
1315 | goto end; | |
1316 | } | |
1317 | ||
9ce5646a MD |
1318 | health_code_update(); |
1319 | ||
331744e3 JD |
1320 | /* Receive metadata string. */ |
1321 | ret = lttcomm_recv_unix_sock(sock, metadata_str, len); | |
1322 | if (ret < 0) { | |
1323 | /* Session daemon is dead so return gracefully. */ | |
1324 | ret_code = ret; | |
1325 | goto end_free; | |
1326 | } | |
1327 | ||
9ce5646a MD |
1328 | health_code_update(); |
1329 | ||
331744e3 | 1330 | pthread_mutex_lock(&channel->metadata_cache->lock); |
93ec662e JD |
1331 | ret = consumer_metadata_cache_write(channel, offset, len, version, |
1332 | metadata_str); | |
331744e3 JD |
1333 | if (ret < 0) { |
1334 | /* Unable to handle metadata. Notify session daemon. */ | |
1335 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
a32bd775 DG |
1336 | /* |
1337 | * Skip metadata flush on write error since the offset and len might | |
1338 | * not have been updated which could create an infinite loop below when | |
1339 | * waiting for the metadata cache to be flushed. | |
1340 | */ | |
1341 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
a32bd775 | 1342 | goto end_free; |
331744e3 JD |
1343 | } |
1344 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
1345 | ||
94d49140 JD |
1346 | if (!wait) { |
1347 | goto end_free; | |
1348 | } | |
5e41ebe1 | 1349 | while (consumer_metadata_cache_flushed(channel, offset + len, timer)) { |
331744e3 | 1350 | DBG("Waiting for metadata to be flushed"); |
9ce5646a MD |
1351 | |
1352 | health_code_update(); | |
1353 | ||
331744e3 JD |
1354 | usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME); |
1355 | } | |
1356 | ||
1357 | end_free: | |
1358 | free(metadata_str); | |
1359 | end: | |
1360 | return ret_code; | |
1361 | } | |
1362 | ||
4cbc1a04 DG |
1363 | /* |
1364 | * Receive command from session daemon and process it. | |
1365 | * | |
1366 | * Return 1 on success else a negative value or 0. | |
1367 | */ | |
3bd1e081 MD |
1368 | int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
1369 | int sock, struct pollfd *consumer_sockpoll) | |
1370 | { | |
1371 | ssize_t ret; | |
0c759fc9 | 1372 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 | 1373 | struct lttcomm_consumer_msg msg; |
ffe60014 | 1374 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 | 1375 | |
9ce5646a MD |
1376 | health_code_update(); |
1377 | ||
3bd1e081 MD |
1378 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
1379 | if (ret != sizeof(msg)) { | |
173af62f DG |
1380 | DBG("Consumer received unexpected message size %zd (expects %zu)", |
1381 | ret, sizeof(msg)); | |
3be74084 DG |
1382 | /* |
1383 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
1384 | * since the caller handles this. | |
1385 | */ | |
489f70e9 | 1386 | if (ret > 0) { |
c6857fcf | 1387 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
489f70e9 MD |
1388 | ret = -1; |
1389 | } | |
3bd1e081 MD |
1390 | return ret; |
1391 | } | |
9ce5646a MD |
1392 | |
1393 | health_code_update(); | |
1394 | ||
84382d49 MD |
1395 | /* deprecated */ |
1396 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 1397 | |
9ce5646a MD |
1398 | health_code_update(); |
1399 | ||
3f8e211f | 1400 | /* relayd needs RCU read-side lock */ |
b0b335c8 MD |
1401 | rcu_read_lock(); |
1402 | ||
3bd1e081 | 1403 | switch (msg.cmd_type) { |
00e2e675 DG |
1404 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
1405 | { | |
f50f23d9 | 1406 | /* Session daemon status message are handled in the following call. */ |
2527bf85 | 1407 | consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
7735ef9e | 1408 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, |
d3e2ba59 JD |
1409 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
1410 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
1411 | goto end_nosignal; |
1412 | } | |
173af62f DG |
1413 | case LTTNG_CONSUMER_DESTROY_RELAYD: |
1414 | { | |
a6ba4fe1 | 1415 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
173af62f DG |
1416 | struct consumer_relayd_sock_pair *relayd; |
1417 | ||
a6ba4fe1 | 1418 | DBG("UST consumer destroying relayd %" PRIu64, index); |
173af62f DG |
1419 | |
1420 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 1421 | relayd = consumer_find_relayd(index); |
173af62f | 1422 | if (relayd == NULL) { |
3448e266 | 1423 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 1424 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
173af62f DG |
1425 | } |
1426 | ||
a6ba4fe1 DG |
1427 | /* |
1428 | * Each relayd socket pair has a refcount of stream attached to it | |
1429 | * which tells if the relayd is still active or not depending on the | |
1430 | * refcount value. | |
1431 | * | |
1432 | * This will set the destroy flag of the relayd object and destroy it | |
1433 | * if the refcount reaches zero when called. | |
1434 | * | |
1435 | * The destroy can happen either here or when a stream fd hangs up. | |
1436 | */ | |
f50f23d9 DG |
1437 | if (relayd) { |
1438 | consumer_flag_relayd_for_destroy(relayd); | |
1439 | } | |
1440 | ||
d88aee68 | 1441 | goto end_msg_sessiond; |
173af62f | 1442 | } |
3bd1e081 MD |
1443 | case LTTNG_CONSUMER_UPDATE_STREAM: |
1444 | { | |
3f8e211f | 1445 | rcu_read_unlock(); |
7ad0a0cb | 1446 | return -ENOSYS; |
3bd1e081 | 1447 | } |
6d805429 | 1448 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 1449 | { |
3be74084 | 1450 | int ret, is_data_pending; |
6d805429 | 1451 | uint64_t id = msg.u.data_pending.session_id; |
ca22feea | 1452 | |
6d805429 | 1453 | DBG("UST consumer data pending command for id %" PRIu64, id); |
ca22feea | 1454 | |
3be74084 | 1455 | is_data_pending = consumer_data_pending(id); |
ca22feea DG |
1456 | |
1457 | /* Send back returned value to session daemon */ | |
3be74084 DG |
1458 | ret = lttcomm_send_unix_sock(sock, &is_data_pending, |
1459 | sizeof(is_data_pending)); | |
ca22feea | 1460 | if (ret < 0) { |
3be74084 | 1461 | DBG("Error when sending the data pending ret code: %d", ret); |
489f70e9 | 1462 | goto error_fatal; |
ca22feea | 1463 | } |
f50f23d9 DG |
1464 | |
1465 | /* | |
1466 | * No need to send back a status message since the data pending | |
1467 | * returned value is the response. | |
1468 | */ | |
ca22feea | 1469 | break; |
53632229 | 1470 | } |
ffe60014 DG |
1471 | case LTTNG_CONSUMER_ASK_CHANNEL_CREATION: |
1472 | { | |
1473 | int ret; | |
1474 | struct ustctl_consumer_channel_attr attr; | |
d2956687 JG |
1475 | const uint64_t chunk_id = msg.u.ask_channel.chunk_id.value; |
1476 | const struct lttng_credentials buffer_credentials = { | |
1477 | .uid = msg.u.ask_channel.buffer_credentials.uid, | |
1478 | .gid = msg.u.ask_channel.buffer_credentials.gid, | |
1479 | }; | |
ffe60014 DG |
1480 | |
1481 | /* Create a plain object and reserve a channel key. */ | |
1482 | channel = allocate_channel(msg.u.ask_channel.session_id, | |
d2956687 JG |
1483 | msg.u.ask_channel.chunk_id.is_set ? |
1484 | &chunk_id : NULL, | |
1485 | msg.u.ask_channel.pathname, | |
1486 | msg.u.ask_channel.name, | |
1487 | msg.u.ask_channel.relayd_id, | |
1488 | msg.u.ask_channel.key, | |
1624d5b7 JD |
1489 | (enum lttng_event_output) msg.u.ask_channel.output, |
1490 | msg.u.ask_channel.tracefile_size, | |
2bba9e53 | 1491 | msg.u.ask_channel.tracefile_count, |
1950109e | 1492 | msg.u.ask_channel.session_id_per_pid, |
ecc48a90 | 1493 | msg.u.ask_channel.monitor, |
d7ba1388 | 1494 | msg.u.ask_channel.live_timer_interval, |
3d071855 | 1495 | msg.u.ask_channel.root_shm_path, |
d7ba1388 | 1496 | msg.u.ask_channel.shm_path); |
ffe60014 DG |
1497 | if (!channel) { |
1498 | goto end_channel_error; | |
1499 | } | |
1500 | ||
d2956687 JG |
1501 | LTTNG_OPTIONAL_SET(&channel->buffer_credentials, |
1502 | buffer_credentials); | |
1503 | ||
567eb353 DG |
1504 | /* |
1505 | * Assign UST application UID to the channel. This value is ignored for | |
1506 | * per PID buffers. This is specific to UST thus setting this after the | |
1507 | * allocation. | |
1508 | */ | |
1509 | channel->ust_app_uid = msg.u.ask_channel.ust_app_uid; | |
1510 | ||
ffe60014 DG |
1511 | /* Build channel attributes from received message. */ |
1512 | attr.subbuf_size = msg.u.ask_channel.subbuf_size; | |
1513 | attr.num_subbuf = msg.u.ask_channel.num_subbuf; | |
1514 | attr.overwrite = msg.u.ask_channel.overwrite; | |
1515 | attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval; | |
1516 | attr.read_timer_interval = msg.u.ask_channel.read_timer_interval; | |
7972aab2 | 1517 | attr.chan_id = msg.u.ask_channel.chan_id; |
ffe60014 | 1518 | memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid)); |
491d1539 | 1519 | attr.blocking_timeout= msg.u.ask_channel.blocking_timeout; |
ffe60014 | 1520 | |
0c759fc9 DG |
1521 | /* Match channel buffer type to the UST abi. */ |
1522 | switch (msg.u.ask_channel.output) { | |
1523 | case LTTNG_EVENT_MMAP: | |
1524 | default: | |
1525 | attr.output = LTTNG_UST_MMAP; | |
1526 | break; | |
1527 | } | |
1528 | ||
ffe60014 DG |
1529 | /* Translate and save channel type. */ |
1530 | switch (msg.u.ask_channel.type) { | |
1531 | case LTTNG_UST_CHAN_PER_CPU: | |
1532 | channel->type = CONSUMER_CHANNEL_TYPE_DATA; | |
1533 | attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8633d6e3 MD |
1534 | /* |
1535 | * Set refcount to 1 for owner. Below, we will | |
1536 | * pass ownership to the | |
1537 | * consumer_thread_channel_poll() thread. | |
1538 | */ | |
1539 | channel->refcount = 1; | |
ffe60014 DG |
1540 | break; |
1541 | case LTTNG_UST_CHAN_METADATA: | |
1542 | channel->type = CONSUMER_CHANNEL_TYPE_METADATA; | |
1543 | attr.type = LTTNG_UST_CHAN_METADATA; | |
1544 | break; | |
1545 | default: | |
1546 | assert(0); | |
1547 | goto error_fatal; | |
1548 | }; | |
1549 | ||
9ce5646a MD |
1550 | health_code_update(); |
1551 | ||
d2956687 | 1552 | ret = ask_channel(ctx, channel, &attr); |
ffe60014 DG |
1553 | if (ret < 0) { |
1554 | goto end_channel_error; | |
1555 | } | |
1556 | ||
fc643247 MD |
1557 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1558 | ret = consumer_metadata_cache_allocate(channel); | |
1559 | if (ret < 0) { | |
1560 | ERR("Allocating metadata cache"); | |
1561 | goto end_channel_error; | |
1562 | } | |
1563 | consumer_timer_switch_start(channel, attr.switch_timer_interval); | |
1564 | attr.switch_timer_interval = 0; | |
94d49140 | 1565 | } else { |
e9404c27 JG |
1566 | int monitor_start_ret; |
1567 | ||
94d49140 JD |
1568 | consumer_timer_live_start(channel, |
1569 | msg.u.ask_channel.live_timer_interval); | |
e9404c27 JG |
1570 | monitor_start_ret = consumer_timer_monitor_start( |
1571 | channel, | |
1572 | msg.u.ask_channel.monitor_timer_interval); | |
1573 | if (monitor_start_ret < 0) { | |
1574 | ERR("Starting channel monitoring timer failed"); | |
1575 | goto end_channel_error; | |
1576 | } | |
fc643247 MD |
1577 | } |
1578 | ||
9ce5646a MD |
1579 | health_code_update(); |
1580 | ||
ffe60014 DG |
1581 | /* |
1582 | * Add the channel to the internal state AFTER all streams were created | |
1583 | * and successfully sent to session daemon. This way, all streams must | |
1584 | * be ready before this channel is visible to the threads. | |
fc643247 MD |
1585 | * If add_channel succeeds, ownership of the channel is |
1586 | * passed to consumer_thread_channel_poll(). | |
ffe60014 DG |
1587 | */ |
1588 | ret = add_channel(channel, ctx); | |
1589 | if (ret < 0) { | |
ea88ca2a MD |
1590 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1591 | if (channel->switch_timer_enabled == 1) { | |
1592 | consumer_timer_switch_stop(channel); | |
1593 | } | |
1594 | consumer_metadata_cache_destroy(channel); | |
1595 | } | |
d3e2ba59 JD |
1596 | if (channel->live_timer_enabled == 1) { |
1597 | consumer_timer_live_stop(channel); | |
1598 | } | |
e9404c27 JG |
1599 | if (channel->monitor_timer_enabled == 1) { |
1600 | consumer_timer_monitor_stop(channel); | |
1601 | } | |
ffe60014 DG |
1602 | goto end_channel_error; |
1603 | } | |
1604 | ||
9ce5646a MD |
1605 | health_code_update(); |
1606 | ||
ffe60014 DG |
1607 | /* |
1608 | * Channel and streams are now created. Inform the session daemon that | |
1609 | * everything went well and should wait to receive the channel and | |
1610 | * streams with ustctl API. | |
1611 | */ | |
1612 | ret = consumer_send_status_channel(sock, channel); | |
1613 | if (ret < 0) { | |
1614 | /* | |
489f70e9 | 1615 | * There is probably a problem on the socket. |
ffe60014 | 1616 | */ |
489f70e9 | 1617 | goto error_fatal; |
ffe60014 DG |
1618 | } |
1619 | ||
1620 | break; | |
1621 | } | |
1622 | case LTTNG_CONSUMER_GET_CHANNEL: | |
1623 | { | |
1624 | int ret, relayd_err = 0; | |
d88aee68 | 1625 | uint64_t key = msg.u.get_channel.key; |
ffe60014 | 1626 | struct lttng_consumer_channel *channel; |
ffe60014 DG |
1627 | |
1628 | channel = consumer_find_channel(key); | |
1629 | if (!channel) { | |
8fd623e0 | 1630 | ERR("UST consumer get channel key %" PRIu64 " not found", key); |
e462382a | 1631 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
f3a1fc7b | 1632 | goto end_get_channel; |
ffe60014 DG |
1633 | } |
1634 | ||
9ce5646a MD |
1635 | health_code_update(); |
1636 | ||
a3a86f35 JG |
1637 | /* Send the channel to sessiond (and relayd, if applicable). */ |
1638 | ret = send_channel_to_sessiond_and_relayd(sock, channel, ctx, | |
1639 | &relayd_err); | |
ffe60014 DG |
1640 | if (ret < 0) { |
1641 | if (relayd_err) { | |
1642 | /* | |
1643 | * We were unable to send to the relayd the stream so avoid | |
1644 | * sending back a fatal error to the thread since this is OK | |
f2a444f1 DG |
1645 | * and the consumer can continue its work. The above call |
1646 | * has sent the error status message to the sessiond. | |
ffe60014 | 1647 | */ |
f3a1fc7b | 1648 | goto end_get_channel_nosignal; |
ffe60014 DG |
1649 | } |
1650 | /* | |
1651 | * The communicaton was broken hence there is a bad state between | |
1652 | * the consumer and sessiond so stop everything. | |
1653 | */ | |
f3a1fc7b | 1654 | goto error_get_channel_fatal; |
ffe60014 DG |
1655 | } |
1656 | ||
9ce5646a MD |
1657 | health_code_update(); |
1658 | ||
10a50311 JD |
1659 | /* |
1660 | * In no monitor mode, the streams ownership is kept inside the channel | |
1661 | * so don't send them to the data thread. | |
1662 | */ | |
1663 | if (!channel->monitor) { | |
f3a1fc7b | 1664 | goto end_get_channel; |
10a50311 JD |
1665 | } |
1666 | ||
d88aee68 DG |
1667 | ret = send_streams_to_thread(channel, ctx); |
1668 | if (ret < 0) { | |
1669 | /* | |
1670 | * If we are unable to send the stream to the thread, there is | |
1671 | * a big problem so just stop everything. | |
1672 | */ | |
f3a1fc7b | 1673 | goto error_get_channel_fatal; |
ffe60014 | 1674 | } |
ffe60014 DG |
1675 | /* List MUST be empty after or else it could be reused. */ |
1676 | assert(cds_list_empty(&channel->streams.head)); | |
f3a1fc7b | 1677 | end_get_channel: |
d88aee68 | 1678 | goto end_msg_sessiond; |
f3a1fc7b JG |
1679 | error_get_channel_fatal: |
1680 | goto error_fatal; | |
1681 | end_get_channel_nosignal: | |
1682 | goto end_nosignal; | |
d88aee68 DG |
1683 | } |
1684 | case LTTNG_CONSUMER_DESTROY_CHANNEL: | |
1685 | { | |
1686 | uint64_t key = msg.u.destroy_channel.key; | |
d88aee68 | 1687 | |
a0cbdd2e MD |
1688 | /* |
1689 | * Only called if streams have not been sent to stream | |
1690 | * manager thread. However, channel has been sent to | |
1691 | * channel manager thread. | |
1692 | */ | |
1693 | notify_thread_del_channel(ctx, key); | |
d88aee68 | 1694 | goto end_msg_sessiond; |
ffe60014 | 1695 | } |
d88aee68 DG |
1696 | case LTTNG_CONSUMER_CLOSE_METADATA: |
1697 | { | |
1698 | int ret; | |
1699 | ||
1700 | ret = close_metadata(msg.u.close_metadata.key); | |
1701 | if (ret != 0) { | |
1702 | ret_code = ret; | |
1703 | } | |
1704 | ||
1705 | goto end_msg_sessiond; | |
1706 | } | |
7972aab2 DG |
1707 | case LTTNG_CONSUMER_FLUSH_CHANNEL: |
1708 | { | |
1709 | int ret; | |
1710 | ||
1711 | ret = flush_channel(msg.u.flush_channel.key); | |
1712 | if (ret != 0) { | |
1713 | ret_code = ret; | |
1714 | } | |
1715 | ||
1716 | goto end_msg_sessiond; | |
1717 | } | |
0dd01979 MD |
1718 | case LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL: |
1719 | { | |
1720 | int ret; | |
1721 | ||
1722 | ret = clear_quiescent_channel( | |
1723 | msg.u.clear_quiescent_channel.key); | |
1724 | if (ret != 0) { | |
1725 | ret_code = ret; | |
1726 | } | |
1727 | ||
1728 | goto end_msg_sessiond; | |
1729 | } | |
d88aee68 | 1730 | case LTTNG_CONSUMER_PUSH_METADATA: |
ffe60014 DG |
1731 | { |
1732 | int ret; | |
d88aee68 | 1733 | uint64_t len = msg.u.push_metadata.len; |
d88aee68 | 1734 | uint64_t key = msg.u.push_metadata.key; |
331744e3 | 1735 | uint64_t offset = msg.u.push_metadata.target_offset; |
93ec662e | 1736 | uint64_t version = msg.u.push_metadata.version; |
ffe60014 DG |
1737 | struct lttng_consumer_channel *channel; |
1738 | ||
8fd623e0 DG |
1739 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, |
1740 | len); | |
ffe60014 DG |
1741 | |
1742 | channel = consumer_find_channel(key); | |
1743 | if (!channel) { | |
000baf6a DG |
1744 | /* |
1745 | * This is possible if the metadata creation on the consumer side | |
1746 | * is in flight vis-a-vis a concurrent push metadata from the | |
1747 | * session daemon. Simply return that the channel failed and the | |
1748 | * session daemon will handle that message correctly considering | |
1749 | * that this race is acceptable thus the DBG() statement here. | |
1750 | */ | |
1751 | DBG("UST consumer push metadata %" PRIu64 " not found", key); | |
1752 | ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; | |
a8ffe244 | 1753 | goto end_push_metadata_msg_sessiond; |
d88aee68 DG |
1754 | } |
1755 | ||
9ce5646a MD |
1756 | health_code_update(); |
1757 | ||
c585821b MD |
1758 | if (!len) { |
1759 | /* | |
1760 | * There is nothing to receive. We have simply | |
1761 | * checked whether the channel can be found. | |
1762 | */ | |
1763 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
a8ffe244 | 1764 | goto end_push_metadata_msg_sessiond; |
c585821b MD |
1765 | } |
1766 | ||
d88aee68 | 1767 | /* Tell session daemon we are ready to receive the metadata. */ |
0c759fc9 | 1768 | ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS); |
ffe60014 DG |
1769 | if (ret < 0) { |
1770 | /* Somehow, the session daemon is not responding anymore. */ | |
a8ffe244 | 1771 | goto error_push_metadata_fatal; |
d88aee68 DG |
1772 | } |
1773 | ||
9ce5646a MD |
1774 | health_code_update(); |
1775 | ||
d88aee68 | 1776 | /* Wait for more data. */ |
9ce5646a MD |
1777 | health_poll_entry(); |
1778 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
1779 | health_poll_exit(); | |
84382d49 | 1780 | if (ret) { |
a8ffe244 | 1781 | goto error_push_metadata_fatal; |
d88aee68 DG |
1782 | } |
1783 | ||
9ce5646a MD |
1784 | health_code_update(); |
1785 | ||
331744e3 | 1786 | ret = lttng_ustconsumer_recv_metadata(sock, key, offset, |
93ec662e | 1787 | len, version, channel, 0, 1); |
d88aee68 | 1788 | if (ret < 0) { |
331744e3 | 1789 | /* error receiving from sessiond */ |
a8ffe244 | 1790 | goto error_push_metadata_fatal; |
331744e3 JD |
1791 | } else { |
1792 | ret_code = ret; | |
a8ffe244 | 1793 | goto end_push_metadata_msg_sessiond; |
d88aee68 | 1794 | } |
a8ffe244 JG |
1795 | end_push_metadata_msg_sessiond: |
1796 | goto end_msg_sessiond; | |
1797 | error_push_metadata_fatal: | |
1798 | goto error_fatal; | |
d88aee68 DG |
1799 | } |
1800 | case LTTNG_CONSUMER_SETUP_METADATA: | |
1801 | { | |
1802 | int ret; | |
1803 | ||
1804 | ret = setup_metadata(ctx, msg.u.setup_metadata.key); | |
1805 | if (ret) { | |
1806 | ret_code = ret; | |
1807 | } | |
1808 | goto end_msg_sessiond; | |
ffe60014 | 1809 | } |
6dc3064a DG |
1810 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
1811 | { | |
3eb928aa MD |
1812 | struct lttng_consumer_channel *channel; |
1813 | uint64_t key = msg.u.snapshot_channel.key; | |
1814 | ||
1815 | channel = consumer_find_channel(key); | |
1816 | if (!channel) { | |
1817 | DBG("UST snapshot channel not found for key %" PRIu64, key); | |
1818 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
10a50311 | 1819 | } else { |
3eb928aa MD |
1820 | if (msg.u.snapshot_channel.metadata) { |
1821 | ret = snapshot_metadata(channel, key, | |
1822 | msg.u.snapshot_channel.pathname, | |
1823 | msg.u.snapshot_channel.relayd_id, | |
d2956687 | 1824 | ctx); |
3eb928aa MD |
1825 | if (ret < 0) { |
1826 | ERR("Snapshot metadata failed"); | |
1827 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
1828 | } | |
1829 | } else { | |
1830 | ret = snapshot_channel(channel, key, | |
1831 | msg.u.snapshot_channel.pathname, | |
1832 | msg.u.snapshot_channel.relayd_id, | |
1833 | msg.u.snapshot_channel.nb_packets_per_stream, | |
1834 | ctx); | |
1835 | if (ret < 0) { | |
1836 | ERR("Snapshot channel failed"); | |
1837 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
1838 | } | |
10a50311 JD |
1839 | } |
1840 | } | |
9ce5646a | 1841 | health_code_update(); |
6dc3064a DG |
1842 | ret = consumer_send_status_msg(sock, ret_code); |
1843 | if (ret < 0) { | |
1844 | /* Somehow, the session daemon is not responding anymore. */ | |
1845 | goto end_nosignal; | |
1846 | } | |
9ce5646a | 1847 | health_code_update(); |
6dc3064a DG |
1848 | break; |
1849 | } | |
fb83fe64 JD |
1850 | case LTTNG_CONSUMER_DISCARDED_EVENTS: |
1851 | { | |
beb59458 MJ |
1852 | int ret = 0; |
1853 | uint64_t discarded_events; | |
fb83fe64 JD |
1854 | struct lttng_ht_iter iter; |
1855 | struct lttng_ht *ht; | |
1856 | struct lttng_consumer_stream *stream; | |
1857 | uint64_t id = msg.u.discarded_events.session_id; | |
1858 | uint64_t key = msg.u.discarded_events.channel_key; | |
1859 | ||
1860 | DBG("UST consumer discarded events command for session id %" | |
1861 | PRIu64, id); | |
1862 | rcu_read_lock(); | |
1863 | pthread_mutex_lock(&consumer_data.lock); | |
1864 | ||
1865 | ht = consumer_data.stream_list_ht; | |
1866 | ||
1867 | /* | |
1868 | * We only need a reference to the channel, but they are not | |
1869 | * directly indexed, so we just use the first matching stream | |
1870 | * to extract the information we need, we default to 0 if not | |
1871 | * found (no events are dropped if the channel is not yet in | |
1872 | * use). | |
1873 | */ | |
beb59458 | 1874 | discarded_events = 0; |
fb83fe64 JD |
1875 | cds_lfht_for_each_entry_duplicate(ht->ht, |
1876 | ht->hash_fct(&id, lttng_ht_seed), | |
1877 | ht->match_fct, &id, | |
1878 | &iter.iter, stream, node_session_id.node) { | |
1879 | if (stream->chan->key == key) { | |
beb59458 | 1880 | discarded_events = stream->chan->discarded_events; |
fb83fe64 JD |
1881 | break; |
1882 | } | |
1883 | } | |
1884 | pthread_mutex_unlock(&consumer_data.lock); | |
1885 | rcu_read_unlock(); | |
1886 | ||
1887 | DBG("UST consumer discarded events command for session id %" | |
1888 | PRIu64 ", channel key %" PRIu64, id, key); | |
1889 | ||
1890 | health_code_update(); | |
1891 | ||
1892 | /* Send back returned value to session daemon */ | |
beb59458 | 1893 | ret = lttcomm_send_unix_sock(sock, &discarded_events, sizeof(discarded_events)); |
fb83fe64 JD |
1894 | if (ret < 0) { |
1895 | PERROR("send discarded events"); | |
1896 | goto error_fatal; | |
1897 | } | |
1898 | ||
1899 | break; | |
1900 | } | |
1901 | case LTTNG_CONSUMER_LOST_PACKETS: | |
1902 | { | |
9a06e8d4 JG |
1903 | int ret; |
1904 | uint64_t lost_packets; | |
fb83fe64 JD |
1905 | struct lttng_ht_iter iter; |
1906 | struct lttng_ht *ht; | |
1907 | struct lttng_consumer_stream *stream; | |
1908 | uint64_t id = msg.u.lost_packets.session_id; | |
1909 | uint64_t key = msg.u.lost_packets.channel_key; | |
1910 | ||
1911 | DBG("UST consumer lost packets command for session id %" | |
1912 | PRIu64, id); | |
1913 | rcu_read_lock(); | |
1914 | pthread_mutex_lock(&consumer_data.lock); | |
1915 | ||
1916 | ht = consumer_data.stream_list_ht; | |
1917 | ||
1918 | /* | |
1919 | * We only need a reference to the channel, but they are not | |
1920 | * directly indexed, so we just use the first matching stream | |
1921 | * to extract the information we need, we default to 0 if not | |
1922 | * found (no packets lost if the channel is not yet in use). | |
1923 | */ | |
9a06e8d4 | 1924 | lost_packets = 0; |
fb83fe64 JD |
1925 | cds_lfht_for_each_entry_duplicate(ht->ht, |
1926 | ht->hash_fct(&id, lttng_ht_seed), | |
1927 | ht->match_fct, &id, | |
1928 | &iter.iter, stream, node_session_id.node) { | |
1929 | if (stream->chan->key == key) { | |
9a06e8d4 | 1930 | lost_packets = stream->chan->lost_packets; |
fb83fe64 JD |
1931 | break; |
1932 | } | |
1933 | } | |
1934 | pthread_mutex_unlock(&consumer_data.lock); | |
1935 | rcu_read_unlock(); | |
1936 | ||
1937 | DBG("UST consumer lost packets command for session id %" | |
1938 | PRIu64 ", channel key %" PRIu64, id, key); | |
1939 | ||
1940 | health_code_update(); | |
1941 | ||
1942 | /* Send back returned value to session daemon */ | |
9a06e8d4 JG |
1943 | ret = lttcomm_send_unix_sock(sock, &lost_packets, |
1944 | sizeof(lost_packets)); | |
fb83fe64 JD |
1945 | if (ret < 0) { |
1946 | PERROR("send lost packets"); | |
1947 | goto error_fatal; | |
1948 | } | |
1949 | ||
1950 | break; | |
1951 | } | |
b3530820 JG |
1952 | case LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE: |
1953 | { | |
1954 | int channel_monitor_pipe; | |
1955 | ||
1956 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1957 | /* Successfully received the command's type. */ | |
1958 | ret = consumer_send_status_msg(sock, ret_code); | |
1959 | if (ret < 0) { | |
1960 | goto error_fatal; | |
1961 | } | |
1962 | ||
1963 | ret = lttcomm_recv_fds_unix_sock(sock, &channel_monitor_pipe, | |
1964 | 1); | |
1965 | if (ret != sizeof(channel_monitor_pipe)) { | |
1966 | ERR("Failed to receive channel monitor pipe"); | |
1967 | goto error_fatal; | |
1968 | } | |
1969 | ||
1970 | DBG("Received channel monitor pipe (%d)", channel_monitor_pipe); | |
1971 | ret = consumer_timer_thread_set_channel_monitor_pipe( | |
1972 | channel_monitor_pipe); | |
1973 | if (!ret) { | |
1974 | int flags; | |
1975 | ||
1976 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1977 | /* Set the pipe as non-blocking. */ | |
1978 | ret = fcntl(channel_monitor_pipe, F_GETFL, 0); | |
1979 | if (ret == -1) { | |
1980 | PERROR("fcntl get flags of the channel monitoring pipe"); | |
1981 | goto error_fatal; | |
1982 | } | |
1983 | flags = ret; | |
1984 | ||
1985 | ret = fcntl(channel_monitor_pipe, F_SETFL, | |
1986 | flags | O_NONBLOCK); | |
1987 | if (ret == -1) { | |
1988 | PERROR("fcntl set O_NONBLOCK flag of the channel monitoring pipe"); | |
1989 | goto error_fatal; | |
1990 | } | |
1991 | DBG("Channel monitor pipe set as non-blocking"); | |
1992 | } else { | |
1993 | ret_code = LTTCOMM_CONSUMERD_ALREADY_SET; | |
1994 | } | |
1995 | goto end_msg_sessiond; | |
1996 | } | |
b99a8d42 JD |
1997 | case LTTNG_CONSUMER_ROTATE_CHANNEL: |
1998 | { | |
92b7a7f8 MD |
1999 | struct lttng_consumer_channel *channel; |
2000 | uint64_t key = msg.u.rotate_channel.key; | |
b99a8d42 | 2001 | |
92b7a7f8 MD |
2002 | channel = consumer_find_channel(key); |
2003 | if (!channel) { | |
2004 | DBG("Channel %" PRIu64 " not found", key); | |
2005 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
2006 | } else { | |
2007 | /* | |
2008 | * Sample the rotate position of all the streams in | |
2009 | * this channel. | |
2010 | */ | |
2011 | ret = lttng_consumer_rotate_channel(channel, key, | |
92b7a7f8 MD |
2012 | msg.u.rotate_channel.relayd_id, |
2013 | msg.u.rotate_channel.metadata, | |
92b7a7f8 MD |
2014 | ctx); |
2015 | if (ret < 0) { | |
2016 | ERR("Rotate channel failed"); | |
2017 | ret_code = LTTCOMM_CONSUMERD_ROTATION_FAIL; | |
2018 | } | |
b99a8d42 | 2019 | |
92b7a7f8 MD |
2020 | health_code_update(); |
2021 | } | |
b99a8d42 JD |
2022 | ret = consumer_send_status_msg(sock, ret_code); |
2023 | if (ret < 0) { | |
2024 | /* Somehow, the session daemon is not responding anymore. */ | |
41c7a76d | 2025 | goto end_rotate_channel_nosignal; |
b99a8d42 JD |
2026 | } |
2027 | ||
2028 | /* | |
2029 | * Rotate the streams that are ready right now. | |
2030 | * FIXME: this is a second consecutive iteration over the | |
2031 | * streams in a channel, there is probably a better way to | |
2032 | * handle this, but it needs to be after the | |
2033 | * consumer_send_status_msg() call. | |
2034 | */ | |
92b7a7f8 MD |
2035 | if (channel) { |
2036 | ret = lttng_consumer_rotate_ready_streams( | |
2037 | channel, key, ctx); | |
2038 | if (ret < 0) { | |
2039 | ERR("Rotate channel failed"); | |
2040 | } | |
b99a8d42 JD |
2041 | } |
2042 | break; | |
41c7a76d JG |
2043 | end_rotate_channel_nosignal: |
2044 | goto end_nosignal; | |
b99a8d42 | 2045 | } |
5f3aff8b MD |
2046 | case LTTNG_CONSUMER_CLEAR_CHANNEL: |
2047 | { | |
2048 | struct lttng_consumer_channel *channel; | |
2049 | uint64_t key = msg.u.clear_channel.key; | |
2050 | ||
2051 | channel = consumer_find_channel(key); | |
2052 | if (!channel) { | |
2053 | DBG("Channel %" PRIu64 " not found", key); | |
2054 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
2055 | } else { | |
2056 | ret = lttng_consumer_clear_channel(channel); | |
2057 | if (ret) { | |
2058 | ERR("Clear channel failed key %" PRIu64, key); | |
2059 | ret_code = ret; | |
2060 | } | |
2061 | ||
2062 | health_code_update(); | |
2063 | } | |
2064 | ret = consumer_send_status_msg(sock, ret_code); | |
2065 | if (ret < 0) { | |
2066 | /* Somehow, the session daemon is not responding anymore. */ | |
2067 | goto end_nosignal; | |
2068 | } | |
2069 | break; | |
2070 | } | |
d2956687 | 2071 | case LTTNG_CONSUMER_INIT: |
00fb02ac | 2072 | { |
d2956687 JG |
2073 | ret_code = lttng_consumer_init_command(ctx, |
2074 | msg.u.init.sessiond_uuid); | |
d88744a4 | 2075 | health_code_update(); |
d88744a4 JD |
2076 | ret = consumer_send_status_msg(sock, ret_code); |
2077 | if (ret < 0) { | |
2078 | /* Somehow, the session daemon is not responding anymore. */ | |
2079 | goto end_nosignal; | |
2080 | } | |
2081 | break; | |
2082 | } | |
d2956687 | 2083 | case LTTNG_CONSUMER_CREATE_TRACE_CHUNK: |
d88744a4 | 2084 | { |
d2956687 | 2085 | const struct lttng_credentials credentials = { |
e5add6d0 JG |
2086 | .uid = msg.u.create_trace_chunk.credentials.value.uid, |
2087 | .gid = msg.u.create_trace_chunk.credentials.value.gid, | |
d2956687 JG |
2088 | }; |
2089 | const bool is_local_trace = | |
2090 | !msg.u.create_trace_chunk.relayd_id.is_set; | |
2091 | const uint64_t relayd_id = | |
2092 | msg.u.create_trace_chunk.relayd_id.value; | |
2093 | const char *chunk_override_name = | |
2094 | *msg.u.create_trace_chunk.override_name ? | |
2095 | msg.u.create_trace_chunk.override_name : | |
2096 | NULL; | |
cbf53d23 | 2097 | struct lttng_directory_handle *chunk_directory_handle = NULL; |
d88744a4 | 2098 | |
d2956687 JG |
2099 | /* |
2100 | * The session daemon will only provide a chunk directory file | |
2101 | * descriptor for local traces. | |
2102 | */ | |
2103 | if (is_local_trace) { | |
2104 | int chunk_dirfd; | |
19990ed5 | 2105 | |
d2956687 JG |
2106 | /* Acnowledge the reception of the command. */ |
2107 | ret = consumer_send_status_msg(sock, | |
2108 | LTTCOMM_CONSUMERD_SUCCESS); | |
2109 | if (ret < 0) { | |
2110 | /* Somehow, the session daemon is not responding anymore. */ | |
2111 | goto end_nosignal; | |
2112 | } | |
92816cc3 | 2113 | |
5da88b0f MD |
2114 | /* |
2115 | * Receive trace chunk domain dirfd. | |
2116 | */ | |
d2956687 JG |
2117 | ret = lttcomm_recv_fds_unix_sock(sock, &chunk_dirfd, 1); |
2118 | if (ret != sizeof(chunk_dirfd)) { | |
5da88b0f | 2119 | ERR("Failed to receive trace chunk domain directory file descriptor"); |
d2956687 JG |
2120 | goto error_fatal; |
2121 | } | |
92816cc3 | 2122 | |
5da88b0f | 2123 | DBG("Received trace chunk domain directory fd (%d)", |
d2956687 | 2124 | chunk_dirfd); |
cbf53d23 | 2125 | chunk_directory_handle = lttng_directory_handle_create_from_dirfd( |
d2956687 | 2126 | chunk_dirfd); |
cbf53d23 | 2127 | if (!chunk_directory_handle) { |
5da88b0f | 2128 | ERR("Failed to initialize chunk domain directory handle from directory file descriptor"); |
d2956687 JG |
2129 | if (close(chunk_dirfd)) { |
2130 | PERROR("Failed to close chunk directory file descriptor"); | |
2131 | } | |
2132 | goto error_fatal; | |
2133 | } | |
92816cc3 JG |
2134 | } |
2135 | ||
d2956687 JG |
2136 | ret_code = lttng_consumer_create_trace_chunk( |
2137 | !is_local_trace ? &relayd_id : NULL, | |
2138 | msg.u.create_trace_chunk.session_id, | |
2139 | msg.u.create_trace_chunk.chunk_id, | |
e5add6d0 JG |
2140 | (time_t) msg.u.create_trace_chunk |
2141 | .creation_timestamp, | |
d2956687 | 2142 | chunk_override_name, |
e5add6d0 JG |
2143 | msg.u.create_trace_chunk.credentials.is_set ? |
2144 | &credentials : | |
2145 | NULL, | |
cbf53d23 JG |
2146 | chunk_directory_handle); |
2147 | lttng_directory_handle_put(chunk_directory_handle); | |
d2956687 | 2148 | goto end_msg_sessiond; |
00fb02ac | 2149 | } |
d2956687 | 2150 | case LTTNG_CONSUMER_CLOSE_TRACE_CHUNK: |
a1ae2ea5 | 2151 | { |
bbc4768c JG |
2152 | enum lttng_trace_chunk_command_type close_command = |
2153 | msg.u.close_trace_chunk.close_command.value; | |
d2956687 JG |
2154 | const uint64_t relayd_id = |
2155 | msg.u.close_trace_chunk.relayd_id.value; | |
ecd1a12f MD |
2156 | struct lttcomm_consumer_close_trace_chunk_reply reply; |
2157 | char closed_trace_chunk_path[LTTNG_PATH_MAX]; | |
2158 | int ret; | |
d2956687 JG |
2159 | |
2160 | ret_code = lttng_consumer_close_trace_chunk( | |
2161 | msg.u.close_trace_chunk.relayd_id.is_set ? | |
bbc4768c JG |
2162 | &relayd_id : |
2163 | NULL, | |
d2956687 JG |
2164 | msg.u.close_trace_chunk.session_id, |
2165 | msg.u.close_trace_chunk.chunk_id, | |
bbc4768c JG |
2166 | (time_t) msg.u.close_trace_chunk.close_timestamp, |
2167 | msg.u.close_trace_chunk.close_command.is_set ? | |
2168 | &close_command : | |
ecd1a12f MD |
2169 | NULL, closed_trace_chunk_path); |
2170 | reply.ret_code = ret_code; | |
2171 | reply.path_length = strlen(closed_trace_chunk_path) + 1; | |
2172 | ret = lttcomm_send_unix_sock(sock, &reply, sizeof(reply)); | |
2173 | if (ret != sizeof(reply)) { | |
2174 | goto error_fatal; | |
2175 | } | |
2176 | ret = lttcomm_send_unix_sock(sock, closed_trace_chunk_path, | |
2177 | reply.path_length); | |
2178 | if (ret != reply.path_length) { | |
2179 | goto error_fatal; | |
2180 | } | |
2181 | goto end_nosignal; | |
a1ae2ea5 | 2182 | } |
d2956687 | 2183 | case LTTNG_CONSUMER_TRACE_CHUNK_EXISTS: |
3654ed19 | 2184 | { |
d2956687 JG |
2185 | const uint64_t relayd_id = |
2186 | msg.u.trace_chunk_exists.relayd_id.value; | |
2187 | ||
2188 | ret_code = lttng_consumer_trace_chunk_exists( | |
2189 | msg.u.trace_chunk_exists.relayd_id.is_set ? | |
2190 | &relayd_id : NULL, | |
2191 | msg.u.trace_chunk_exists.session_id, | |
2192 | msg.u.trace_chunk_exists.chunk_id); | |
2193 | goto end_msg_sessiond; | |
3654ed19 | 2194 | } |
3bd1e081 MD |
2195 | default: |
2196 | break; | |
2197 | } | |
3f8e211f | 2198 | |
3bd1e081 | 2199 | end_nosignal: |
4cbc1a04 DG |
2200 | /* |
2201 | * Return 1 to indicate success since the 0 value can be a socket | |
2202 | * shutdown during the recv() or send() call. | |
2203 | */ | |
f3a1fc7b JG |
2204 | ret = 1; |
2205 | goto end; | |
ffe60014 DG |
2206 | |
2207 | end_msg_sessiond: | |
2208 | /* | |
2209 | * The returned value here is not useful since either way we'll return 1 to | |
2210 | * the caller because the session daemon socket management is done | |
2211 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. | |
2212 | */ | |
489f70e9 MD |
2213 | ret = consumer_send_status_msg(sock, ret_code); |
2214 | if (ret < 0) { | |
2215 | goto error_fatal; | |
2216 | } | |
f3a1fc7b JG |
2217 | ret = 1; |
2218 | goto end; | |
9ce5646a | 2219 | |
ffe60014 DG |
2220 | end_channel_error: |
2221 | if (channel) { | |
2222 | /* | |
2223 | * Free channel here since no one has a reference to it. We don't | |
2224 | * free after that because a stream can store this pointer. | |
2225 | */ | |
2226 | destroy_channel(channel); | |
2227 | } | |
2228 | /* We have to send a status channel message indicating an error. */ | |
2229 | ret = consumer_send_status_channel(sock, NULL); | |
2230 | if (ret < 0) { | |
2231 | /* Stop everything if session daemon can not be notified. */ | |
2232 | goto error_fatal; | |
2233 | } | |
f3a1fc7b JG |
2234 | ret = 1; |
2235 | goto end; | |
9ce5646a | 2236 | |
ffe60014 | 2237 | error_fatal: |
ffe60014 | 2238 | /* This will issue a consumer stop. */ |
f3a1fc7b JG |
2239 | ret = -1; |
2240 | goto end; | |
2241 | ||
2242 | end: | |
2243 | rcu_read_unlock(); | |
2244 | health_code_update(); | |
2245 | return ret; | |
3bd1e081 MD |
2246 | } |
2247 | ||
fc6d7a51 JD |
2248 | void lttng_ustctl_flush_buffer(struct lttng_consumer_stream *stream, |
2249 | int producer_active) | |
2250 | { | |
2251 | assert(stream); | |
2252 | assert(stream->ustream); | |
2253 | ||
2254 | ustctl_flush_buffer(stream->ustream, producer_active); | |
2255 | } | |
2256 | ||
ffe60014 | 2257 | /* |
e9404c27 | 2258 | * Take a snapshot for a specific stream. |
ffe60014 DG |
2259 | * |
2260 | * Returns 0 on success, < 0 on error | |
2261 | */ | |
2262 | int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream) | |
3bd1e081 | 2263 | { |
ffe60014 DG |
2264 | assert(stream); |
2265 | assert(stream->ustream); | |
2266 | ||
2267 | return ustctl_snapshot(stream->ustream); | |
3bd1e081 MD |
2268 | } |
2269 | ||
e9404c27 JG |
2270 | /* |
2271 | * Sample consumed and produced positions for a specific stream. | |
2272 | * | |
2273 | * Returns 0 on success, < 0 on error. | |
2274 | */ | |
2275 | int lttng_ustconsumer_sample_snapshot_positions( | |
2276 | struct lttng_consumer_stream *stream) | |
2277 | { | |
2278 | assert(stream); | |
2279 | assert(stream->ustream); | |
2280 | ||
2281 | return ustctl_snapshot_sample_positions(stream->ustream); | |
2282 | } | |
2283 | ||
ffe60014 DG |
2284 | /* |
2285 | * Get the produced position | |
2286 | * | |
2287 | * Returns 0 on success, < 0 on error | |
2288 | */ | |
2289 | int lttng_ustconsumer_get_produced_snapshot( | |
2290 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
3bd1e081 | 2291 | { |
ffe60014 DG |
2292 | assert(stream); |
2293 | assert(stream->ustream); | |
2294 | assert(pos); | |
7a57cf92 | 2295 | |
ffe60014 DG |
2296 | return ustctl_snapshot_get_produced(stream->ustream, pos); |
2297 | } | |
7a57cf92 | 2298 | |
10a50311 JD |
2299 | /* |
2300 | * Get the consumed position | |
2301 | * | |
2302 | * Returns 0 on success, < 0 on error | |
2303 | */ | |
2304 | int lttng_ustconsumer_get_consumed_snapshot( | |
2305 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
2306 | { | |
2307 | assert(stream); | |
2308 | assert(stream->ustream); | |
2309 | assert(pos); | |
2310 | ||
2311 | return ustctl_snapshot_get_consumed(stream->ustream, pos); | |
2312 | } | |
2313 | ||
84a182ce DG |
2314 | void lttng_ustconsumer_flush_buffer(struct lttng_consumer_stream *stream, |
2315 | int producer) | |
2316 | { | |
2317 | assert(stream); | |
2318 | assert(stream->ustream); | |
2319 | ||
2320 | ustctl_flush_buffer(stream->ustream, producer); | |
2321 | } | |
2322 | ||
214f70e0 JR |
2323 | void lttng_ustconsumer_clear_buffer(struct lttng_consumer_stream *stream) |
2324 | { | |
2325 | assert(stream); | |
2326 | assert(stream->ustream); | |
2327 | ||
2328 | ustctl_clear_buffer(stream->ustream); | |
2329 | } | |
2330 | ||
84a182ce DG |
2331 | int lttng_ustconsumer_get_current_timestamp( |
2332 | struct lttng_consumer_stream *stream, uint64_t *ts) | |
2333 | { | |
2334 | assert(stream); | |
2335 | assert(stream->ustream); | |
2336 | assert(ts); | |
2337 | ||
2338 | return ustctl_get_current_timestamp(stream->ustream, ts); | |
2339 | } | |
2340 | ||
fb83fe64 JD |
2341 | int lttng_ustconsumer_get_sequence_number( |
2342 | struct lttng_consumer_stream *stream, uint64_t *seq) | |
2343 | { | |
2344 | assert(stream); | |
2345 | assert(stream->ustream); | |
2346 | assert(seq); | |
2347 | ||
2348 | return ustctl_get_sequence_number(stream->ustream, seq); | |
2349 | } | |
2350 | ||
ffe60014 | 2351 | /* |
0dd01979 | 2352 | * Called when the stream signals the consumer that it has hung up. |
ffe60014 DG |
2353 | */ |
2354 | void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream) | |
2355 | { | |
2356 | assert(stream); | |
2357 | assert(stream->ustream); | |
2c1dd183 | 2358 | |
0dd01979 MD |
2359 | pthread_mutex_lock(&stream->lock); |
2360 | if (!stream->quiescent) { | |
2361 | ustctl_flush_buffer(stream->ustream, 0); | |
2362 | stream->quiescent = true; | |
2363 | } | |
2364 | pthread_mutex_unlock(&stream->lock); | |
ffe60014 DG |
2365 | stream->hangup_flush_done = 1; |
2366 | } | |
ee77a7b0 | 2367 | |
ffe60014 DG |
2368 | void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan) |
2369 | { | |
4628484a MD |
2370 | int i; |
2371 | ||
ffe60014 DG |
2372 | assert(chan); |
2373 | assert(chan->uchan); | |
d2956687 | 2374 | assert(chan->buffer_credentials.is_set); |
e316aad5 | 2375 | |
ea88ca2a MD |
2376 | if (chan->switch_timer_enabled == 1) { |
2377 | consumer_timer_switch_stop(chan); | |
2378 | } | |
4628484a MD |
2379 | for (i = 0; i < chan->nr_stream_fds; i++) { |
2380 | int ret; | |
2381 | ||
2382 | ret = close(chan->stream_fds[i]); | |
2383 | if (ret) { | |
2384 | PERROR("close"); | |
2385 | } | |
2386 | if (chan->shm_path[0]) { | |
2387 | char shm_path[PATH_MAX]; | |
2388 | ||
2389 | ret = get_stream_shm_path(shm_path, chan->shm_path, i); | |
2390 | if (ret) { | |
2391 | ERR("Cannot get stream shm path"); | |
2392 | } | |
d2956687 JG |
2393 | ret = run_as_unlink(shm_path, |
2394 | chan->buffer_credentials.value.uid, | |
2395 | chan->buffer_credentials.value.gid); | |
4628484a | 2396 | if (ret) { |
4628484a MD |
2397 | PERROR("unlink %s", shm_path); |
2398 | } | |
2399 | } | |
2400 | } | |
3bd1e081 MD |
2401 | } |
2402 | ||
b83e03c4 MD |
2403 | void lttng_ustconsumer_free_channel(struct lttng_consumer_channel *chan) |
2404 | { | |
2405 | assert(chan); | |
2406 | assert(chan->uchan); | |
d2956687 | 2407 | assert(chan->buffer_credentials.is_set); |
b83e03c4 MD |
2408 | |
2409 | consumer_metadata_cache_destroy(chan); | |
2410 | ustctl_destroy_channel(chan->uchan); | |
ea853771 JR |
2411 | /* Try to rmdir all directories under shm_path root. */ |
2412 | if (chan->root_shm_path[0]) { | |
602766ec | 2413 | (void) run_as_rmdir_recursive(chan->root_shm_path, |
d2956687 | 2414 | chan->buffer_credentials.value.uid, |
f75c5439 MD |
2415 | chan->buffer_credentials.value.gid, |
2416 | LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG); | |
ea853771 | 2417 | } |
b83e03c4 MD |
2418 | free(chan->stream_fds); |
2419 | } | |
2420 | ||
3bd1e081 MD |
2421 | void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream) |
2422 | { | |
ffe60014 DG |
2423 | assert(stream); |
2424 | assert(stream->ustream); | |
d41f73b7 | 2425 | |
ea88ca2a MD |
2426 | if (stream->chan->switch_timer_enabled == 1) { |
2427 | consumer_timer_switch_stop(stream->chan); | |
2428 | } | |
ffe60014 DG |
2429 | ustctl_destroy_stream(stream->ustream); |
2430 | } | |
d41f73b7 | 2431 | |
6d574024 DG |
2432 | int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream) |
2433 | { | |
2434 | assert(stream); | |
2435 | assert(stream->ustream); | |
2436 | ||
2437 | return ustctl_stream_get_wakeup_fd(stream->ustream); | |
2438 | } | |
2439 | ||
2440 | int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream) | |
2441 | { | |
2442 | assert(stream); | |
2443 | assert(stream->ustream); | |
2444 | ||
2445 | return ustctl_stream_close_wakeup_fd(stream->ustream); | |
2446 | } | |
2447 | ||
309167d2 JD |
2448 | /* |
2449 | * Populate index values of a UST stream. Values are set in big endian order. | |
2450 | * | |
2451 | * Return 0 on success or else a negative value. | |
2452 | */ | |
50adc264 | 2453 | static int get_index_values(struct ctf_packet_index *index, |
309167d2 JD |
2454 | struct ustctl_consumer_stream *ustream) |
2455 | { | |
2456 | int ret; | |
85d1db9f JG |
2457 | uint64_t packet_size, content_size, timestamp_begin, timestamp_end, |
2458 | events_discarded, stream_id, stream_instance_id, | |
2459 | packet_seq_num; | |
309167d2 | 2460 | |
85d1db9f | 2461 | ret = ustctl_get_timestamp_begin(ustream, ×tamp_begin); |
309167d2 JD |
2462 | if (ret < 0) { |
2463 | PERROR("ustctl_get_timestamp_begin"); | |
2464 | goto error; | |
2465 | } | |
309167d2 | 2466 | |
85d1db9f | 2467 | ret = ustctl_get_timestamp_end(ustream, ×tamp_end); |
309167d2 JD |
2468 | if (ret < 0) { |
2469 | PERROR("ustctl_get_timestamp_end"); | |
2470 | goto error; | |
2471 | } | |
309167d2 | 2472 | |
85d1db9f | 2473 | ret = ustctl_get_events_discarded(ustream, &events_discarded); |
309167d2 JD |
2474 | if (ret < 0) { |
2475 | PERROR("ustctl_get_events_discarded"); | |
2476 | goto error; | |
2477 | } | |
309167d2 | 2478 | |
85d1db9f | 2479 | ret = ustctl_get_content_size(ustream, &content_size); |
309167d2 JD |
2480 | if (ret < 0) { |
2481 | PERROR("ustctl_get_content_size"); | |
2482 | goto error; | |
2483 | } | |
309167d2 | 2484 | |
85d1db9f | 2485 | ret = ustctl_get_packet_size(ustream, &packet_size); |
309167d2 JD |
2486 | if (ret < 0) { |
2487 | PERROR("ustctl_get_packet_size"); | |
2488 | goto error; | |
2489 | } | |
309167d2 | 2490 | |
85d1db9f | 2491 | ret = ustctl_get_stream_id(ustream, &stream_id); |
309167d2 JD |
2492 | if (ret < 0) { |
2493 | PERROR("ustctl_get_stream_id"); | |
2494 | goto error; | |
2495 | } | |
309167d2 | 2496 | |
85d1db9f | 2497 | ret = ustctl_get_instance_id(ustream, &stream_instance_id); |
234cd636 JD |
2498 | if (ret < 0) { |
2499 | PERROR("ustctl_get_instance_id"); | |
2500 | goto error; | |
2501 | } | |
234cd636 | 2502 | |
85d1db9f | 2503 | ret = ustctl_get_sequence_number(ustream, &packet_seq_num); |
234cd636 JD |
2504 | if (ret < 0) { |
2505 | PERROR("ustctl_get_sequence_number"); | |
2506 | goto error; | |
2507 | } | |
85d1db9f JG |
2508 | |
2509 | *index = (typeof(*index)) { | |
2510 | .offset = index->offset, | |
2511 | .packet_size = htobe64(packet_size), | |
2512 | .content_size = htobe64(content_size), | |
2513 | .timestamp_begin = htobe64(timestamp_begin), | |
2514 | .timestamp_end = htobe64(timestamp_end), | |
2515 | .events_discarded = htobe64(events_discarded), | |
2516 | .stream_id = htobe64(stream_id), | |
2517 | .stream_instance_id = htobe64(stream_instance_id), | |
2518 | .packet_seq_num = htobe64(packet_seq_num), | |
2519 | }; | |
234cd636 | 2520 | |
309167d2 JD |
2521 | error: |
2522 | return ret; | |
2523 | } | |
2524 | ||
93ec662e JD |
2525 | static |
2526 | void metadata_stream_reset_cache(struct lttng_consumer_stream *stream, | |
2527 | struct consumer_metadata_cache *cache) | |
2528 | { | |
2529 | DBG("Metadata stream update to version %" PRIu64, | |
2530 | cache->version); | |
2531 | stream->ust_metadata_pushed = 0; | |
2532 | stream->metadata_version = cache->version; | |
2533 | stream->reset_metadata_flag = 1; | |
2534 | } | |
2535 | ||
2536 | /* | |
2537 | * Check if the version of the metadata stream and metadata cache match. | |
2538 | * If the cache got updated, reset the metadata stream. | |
2539 | * The stream lock and metadata cache lock MUST be held. | |
2540 | * Return 0 on success, a negative value on error. | |
2541 | */ | |
2542 | static | |
2543 | int metadata_stream_check_version(struct lttng_consumer_stream *stream) | |
2544 | { | |
2545 | int ret = 0; | |
2546 | struct consumer_metadata_cache *cache = stream->chan->metadata_cache; | |
2547 | ||
2548 | if (cache->version == stream->metadata_version) { | |
2549 | goto end; | |
2550 | } | |
2551 | metadata_stream_reset_cache(stream, cache); | |
2552 | ||
2553 | end: | |
2554 | return ret; | |
2555 | } | |
2556 | ||
94d49140 JD |
2557 | /* |
2558 | * Write up to one packet from the metadata cache to the channel. | |
2559 | * | |
2560 | * Returns the number of bytes pushed in the cache, or a negative value | |
2561 | * on error. | |
2562 | */ | |
2563 | static | |
2564 | int commit_one_metadata_packet(struct lttng_consumer_stream *stream) | |
2565 | { | |
2566 | ssize_t write_len; | |
2567 | int ret; | |
2568 | ||
2569 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); | |
93ec662e JD |
2570 | ret = metadata_stream_check_version(stream); |
2571 | if (ret < 0) { | |
2572 | goto end; | |
2573 | } | |
c585821b | 2574 | if (stream->chan->metadata_cache->max_offset |
94d49140 JD |
2575 | == stream->ust_metadata_pushed) { |
2576 | ret = 0; | |
2577 | goto end; | |
2578 | } | |
2579 | ||
2580 | write_len = ustctl_write_one_packet_to_channel(stream->chan->uchan, | |
2581 | &stream->chan->metadata_cache->data[stream->ust_metadata_pushed], | |
c585821b | 2582 | stream->chan->metadata_cache->max_offset |
94d49140 JD |
2583 | - stream->ust_metadata_pushed); |
2584 | assert(write_len != 0); | |
2585 | if (write_len < 0) { | |
2586 | ERR("Writing one metadata packet"); | |
2587 | ret = -1; | |
2588 | goto end; | |
2589 | } | |
2590 | stream->ust_metadata_pushed += write_len; | |
2591 | ||
c585821b | 2592 | assert(stream->chan->metadata_cache->max_offset >= |
94d49140 JD |
2593 | stream->ust_metadata_pushed); |
2594 | ret = write_len; | |
2595 | ||
0d88e046 JG |
2596 | /* |
2597 | * Switch packet (but don't open the next one) on every commit of | |
2598 | * a metadata packet. Since the subbuffer is fully filled (with padding, | |
2599 | * if needed), the stream is "quiescent" after this commit. | |
2600 | */ | |
2601 | ustctl_flush_buffer(stream->ustream, 1); | |
2602 | stream->quiescent = true; | |
94d49140 JD |
2603 | end: |
2604 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); | |
2605 | return ret; | |
2606 | } | |
2607 | ||
309167d2 | 2608 | |
94d49140 JD |
2609 | /* |
2610 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
2611 | * metadata thread can consumer them. | |
2612 | * | |
c585821b MD |
2613 | * Metadata stream lock is held here, but we need to release it when |
2614 | * interacting with sessiond, else we cause a deadlock with live | |
2615 | * awaiting on metadata to be pushed out. | |
94d49140 | 2616 | * |
cdb72e4e JG |
2617 | * The RCU read side lock must be held by the caller. |
2618 | * | |
94d49140 JD |
2619 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream |
2620 | * is empty or a negative value on error. | |
2621 | */ | |
2622 | int lttng_ustconsumer_sync_metadata(struct lttng_consumer_local_data *ctx, | |
cdb72e4e | 2623 | struct lttng_consumer_stream *metadata_stream) |
94d49140 JD |
2624 | { |
2625 | int ret; | |
2626 | int retry = 0; | |
cdb72e4e | 2627 | struct lttng_consumer_channel *metadata_channel; |
94d49140 JD |
2628 | |
2629 | assert(ctx); | |
cdb72e4e | 2630 | assert(metadata_stream); |
94d49140 | 2631 | |
cdb72e4e JG |
2632 | metadata_channel = metadata_stream->chan; |
2633 | pthread_mutex_unlock(&metadata_stream->lock); | |
94d49140 JD |
2634 | /* |
2635 | * Request metadata from the sessiond, but don't wait for the flush | |
2636 | * because we locked the metadata thread. | |
2637 | */ | |
cdb72e4e JG |
2638 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 0); |
2639 | pthread_mutex_lock(&metadata_stream->lock); | |
94d49140 JD |
2640 | if (ret < 0) { |
2641 | goto end; | |
2642 | } | |
2643 | ||
cdb72e4e JG |
2644 | /* |
2645 | * The metadata stream and channel can be deleted while the | |
2646 | * metadata stream lock was released. The streamed is checked | |
2647 | * for deletion before we use it further. | |
2648 | * | |
2649 | * Note that it is safe to access a logically-deleted stream since its | |
2650 | * existence is still guaranteed by the RCU read side lock. However, | |
2651 | * it should no longer be used. The close/deletion of the metadata | |
2652 | * channel and stream already guarantees that all metadata has been | |
2653 | * consumed. Therefore, there is nothing left to do in this function. | |
2654 | */ | |
2655 | if (consumer_stream_is_deleted(metadata_stream)) { | |
2656 | DBG("Metadata stream %" PRIu64 " was deleted during the metadata synchronization", | |
2657 | metadata_stream->key); | |
2658 | ret = 0; | |
2659 | goto end; | |
2660 | } | |
2661 | ||
2662 | ret = commit_one_metadata_packet(metadata_stream); | |
94d49140 JD |
2663 | if (ret <= 0) { |
2664 | goto end; | |
2665 | } else if (ret > 0) { | |
2666 | retry = 1; | |
2667 | } | |
2668 | ||
cdb72e4e | 2669 | ret = ustctl_snapshot(metadata_stream->ustream); |
94d49140 JD |
2670 | if (ret < 0) { |
2671 | if (errno != EAGAIN) { | |
2672 | ERR("Sync metadata, taking UST snapshot"); | |
2673 | goto end; | |
2674 | } | |
2675 | DBG("No new metadata when syncing them."); | |
2676 | /* No new metadata, exit. */ | |
2677 | ret = ENODATA; | |
2678 | goto end; | |
2679 | } | |
2680 | ||
2681 | /* | |
2682 | * After this flush, we still need to extract metadata. | |
2683 | */ | |
2684 | if (retry) { | |
2685 | ret = EAGAIN; | |
2686 | } | |
2687 | ||
2688 | end: | |
2689 | return ret; | |
2690 | } | |
2691 | ||
02b3d176 DG |
2692 | /* |
2693 | * Return 0 on success else a negative value. | |
2694 | */ | |
2695 | static int notify_if_more_data(struct lttng_consumer_stream *stream, | |
2696 | struct lttng_consumer_local_data *ctx) | |
2697 | { | |
2698 | int ret; | |
2699 | struct ustctl_consumer_stream *ustream; | |
2700 | ||
2701 | assert(stream); | |
2702 | assert(ctx); | |
2703 | ||
2704 | ustream = stream->ustream; | |
2705 | ||
2706 | /* | |
2707 | * First, we are going to check if there is a new subbuffer available | |
2708 | * before reading the stream wait_fd. | |
2709 | */ | |
2710 | /* Get the next subbuffer */ | |
2711 | ret = ustctl_get_next_subbuf(ustream); | |
2712 | if (ret) { | |
2713 | /* No more data found, flag the stream. */ | |
2714 | stream->has_data = 0; | |
2715 | ret = 0; | |
2716 | goto end; | |
2717 | } | |
2718 | ||
5420e5db | 2719 | ret = ustctl_put_subbuf(ustream); |
02b3d176 DG |
2720 | assert(!ret); |
2721 | ||
2722 | /* This stream still has data. Flag it and wake up the data thread. */ | |
2723 | stream->has_data = 1; | |
2724 | ||
2725 | if (stream->monitor && !stream->hangup_flush_done && !ctx->has_wakeup) { | |
2726 | ssize_t writelen; | |
2727 | ||
2728 | writelen = lttng_pipe_write(ctx->consumer_wakeup_pipe, "!", 1); | |
2729 | if (writelen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
2730 | ret = writelen; | |
2731 | goto end; | |
2732 | } | |
2733 | ||
2734 | /* The wake up pipe has been notified. */ | |
2735 | ctx->has_wakeup = 1; | |
2736 | } | |
2737 | ret = 0; | |
2738 | ||
2739 | end: | |
2740 | return ret; | |
2741 | } | |
2742 | ||
fb83fe64 JD |
2743 | static |
2744 | int update_stream_stats(struct lttng_consumer_stream *stream) | |
2745 | { | |
2746 | int ret; | |
2747 | uint64_t seq, discarded; | |
2748 | ||
2749 | ret = ustctl_get_sequence_number(stream->ustream, &seq); | |
2750 | if (ret < 0) { | |
2751 | PERROR("ustctl_get_sequence_number"); | |
2752 | goto end; | |
2753 | } | |
2754 | /* | |
2755 | * Start the sequence when we extract the first packet in case we don't | |
2756 | * start at 0 (for example if a consumer is not connected to the | |
2757 | * session immediately after the beginning). | |
2758 | */ | |
2759 | if (stream->last_sequence_number == -1ULL) { | |
2760 | stream->last_sequence_number = seq; | |
2761 | } else if (seq > stream->last_sequence_number) { | |
2762 | stream->chan->lost_packets += seq - | |
2763 | stream->last_sequence_number - 1; | |
2764 | } else { | |
2765 | /* seq <= last_sequence_number */ | |
2766 | ERR("Sequence number inconsistent : prev = %" PRIu64 | |
2767 | ", current = %" PRIu64, | |
2768 | stream->last_sequence_number, seq); | |
2769 | ret = -1; | |
2770 | goto end; | |
2771 | } | |
2772 | stream->last_sequence_number = seq; | |
2773 | ||
2774 | ret = ustctl_get_events_discarded(stream->ustream, &discarded); | |
2775 | if (ret < 0) { | |
2776 | PERROR("kernctl_get_events_discarded"); | |
2777 | goto end; | |
2778 | } | |
2779 | if (discarded < stream->last_discarded_events) { | |
2780 | /* | |
83f4233d MJ |
2781 | * Overflow has occurred. We assume only one wrap-around |
2782 | * has occurred. | |
fb83fe64 JD |
2783 | */ |
2784 | stream->chan->discarded_events += | |
2785 | (1ULL << (CAA_BITS_PER_LONG - 1)) - | |
2786 | stream->last_discarded_events + discarded; | |
2787 | } else { | |
2788 | stream->chan->discarded_events += discarded - | |
2789 | stream->last_discarded_events; | |
2790 | } | |
2791 | stream->last_discarded_events = discarded; | |
2792 | ret = 0; | |
2793 | ||
2794 | end: | |
2795 | return ret; | |
2796 | } | |
2797 | ||
94d49140 JD |
2798 | /* |
2799 | * Read subbuffer from the given stream. | |
2800 | * | |
d2956687 | 2801 | * Stream and channel locks MUST be acquired by the caller. |
94d49140 JD |
2802 | * |
2803 | * Return 0 on success else a negative value. | |
2804 | */ | |
d41f73b7 | 2805 | int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d2956687 | 2806 | struct lttng_consumer_local_data *ctx) |
d41f73b7 | 2807 | { |
1d4dfdef | 2808 | unsigned long len, subbuf_size, padding; |
02d02e31 | 2809 | int err, write_index = 1, rotation_ret; |
d41f73b7 | 2810 | long ret = 0; |
ffe60014 | 2811 | struct ustctl_consumer_stream *ustream; |
50adc264 | 2812 | struct ctf_packet_index index; |
276cd1d7 | 2813 | const char *subbuf_addr; |
a587bd64 | 2814 | struct lttng_buffer_view subbuf_view; |
ffe60014 DG |
2815 | |
2816 | assert(stream); | |
2817 | assert(stream->ustream); | |
2818 | assert(ctx); | |
d41f73b7 | 2819 | |
3eb914c0 | 2820 | DBG("In UST read_subbuffer (wait_fd: %d, name: %s)", stream->wait_fd, |
ffe60014 DG |
2821 | stream->name); |
2822 | ||
2823 | /* Ease our life for what's next. */ | |
2824 | ustream = stream->ustream; | |
d41f73b7 | 2825 | |
6cd525e8 | 2826 | /* |
02b3d176 DG |
2827 | * We can consume the 1 byte written into the wait_fd by UST. Don't trigger |
2828 | * error if we cannot read this one byte (read returns 0), or if the error | |
2829 | * is EAGAIN or EWOULDBLOCK. | |
2830 | * | |
2831 | * This is only done when the stream is monitored by a thread, before the | |
2832 | * flush is done after a hangup and if the stream is not flagged with data | |
2833 | * since there might be nothing to consume in the wait fd but still have | |
2834 | * data available flagged by the consumer wake up pipe. | |
6cd525e8 | 2835 | */ |
02b3d176 DG |
2836 | if (stream->monitor && !stream->hangup_flush_done && !stream->has_data) { |
2837 | char dummy; | |
c617c0c6 MD |
2838 | ssize_t readlen; |
2839 | ||
6cd525e8 MD |
2840 | readlen = lttng_read(stream->wait_fd, &dummy, 1); |
2841 | if (readlen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
effcf122 | 2842 | ret = readlen; |
02d02e31 JD |
2843 | goto error; |
2844 | } | |
2845 | } | |
2846 | ||
2847 | /* | |
2848 | * If the stream was flagged to be ready for rotation before we extract the | |
2849 | * next packet, rotate it now. | |
2850 | */ | |
2851 | if (stream->rotate_ready) { | |
2852 | DBG("Rotate stream before extracting data"); | |
d2956687 | 2853 | rotation_ret = lttng_consumer_rotate_stream(ctx, stream); |
02d02e31 JD |
2854 | if (rotation_ret < 0) { |
2855 | ERR("Stream rotation error"); | |
2856 | ret = -1; | |
2857 | goto error; | |
effcf122 | 2858 | } |
d41f73b7 MD |
2859 | } |
2860 | ||
04ef1097 | 2861 | retry: |
d41f73b7 | 2862 | /* Get the next subbuffer */ |
ffe60014 | 2863 | err = ustctl_get_next_subbuf(ustream); |
d41f73b7 | 2864 | if (err != 0) { |
04ef1097 MD |
2865 | /* |
2866 | * Populate metadata info if the existing info has | |
2867 | * already been read. | |
2868 | */ | |
2869 | if (stream->metadata_flag) { | |
94d49140 JD |
2870 | ret = commit_one_metadata_packet(stream); |
2871 | if (ret <= 0) { | |
02d02e31 | 2872 | goto error; |
04ef1097 | 2873 | } |
04ef1097 MD |
2874 | goto retry; |
2875 | } | |
2876 | ||
1d4dfdef | 2877 | ret = err; /* ustctl_get_next_subbuf returns negative, caller expect positive. */ |
d41f73b7 MD |
2878 | /* |
2879 | * This is a debug message even for single-threaded consumer, | |
2880 | * because poll() have more relaxed criterions than get subbuf, | |
2881 | * so get_subbuf may fail for short race windows where poll() | |
2882 | * would issue wakeups. | |
2883 | */ | |
2884 | DBG("Reserving sub buffer failed (everything is normal, " | |
ffe60014 | 2885 | "it is due to concurrency) [ret: %d]", err); |
02d02e31 | 2886 | goto error; |
d41f73b7 | 2887 | } |
ffe60014 | 2888 | assert(stream->chan->output == CONSUMER_CHANNEL_MMAP); |
309167d2 | 2889 | |
1c20f0e2 | 2890 | if (!stream->metadata_flag) { |
309167d2 JD |
2891 | index.offset = htobe64(stream->out_fd_offset); |
2892 | ret = get_index_values(&index, ustream); | |
2893 | if (ret < 0) { | |
7b87473d MD |
2894 | err = ustctl_put_subbuf(ustream); |
2895 | assert(err == 0); | |
02d02e31 | 2896 | goto error; |
309167d2 | 2897 | } |
fb83fe64 JD |
2898 | |
2899 | /* Update the stream's sequence and discarded events count. */ | |
2900 | ret = update_stream_stats(stream); | |
2901 | if (ret < 0) { | |
2902 | PERROR("kernctl_get_events_discarded"); | |
7b87473d MD |
2903 | err = ustctl_put_subbuf(ustream); |
2904 | assert(err == 0); | |
02d02e31 | 2905 | goto error; |
fb83fe64 | 2906 | } |
1c20f0e2 JD |
2907 | } else { |
2908 | write_index = 0; | |
309167d2 JD |
2909 | } |
2910 | ||
1d4dfdef | 2911 | /* Get the full padded subbuffer size */ |
ffe60014 | 2912 | err = ustctl_get_padded_subbuf_size(ustream, &len); |
effcf122 | 2913 | assert(err == 0); |
1d4dfdef DG |
2914 | |
2915 | /* Get subbuffer data size (without padding) */ | |
ffe60014 | 2916 | err = ustctl_get_subbuf_size(ustream, &subbuf_size); |
1d4dfdef DG |
2917 | assert(err == 0); |
2918 | ||
2919 | /* Make sure we don't get a subbuffer size bigger than the padded */ | |
2920 | assert(len >= subbuf_size); | |
2921 | ||
2922 | padding = len - subbuf_size; | |
02d02e31 | 2923 | |
276cd1d7 JG |
2924 | ret = get_current_subbuf_addr(stream, &subbuf_addr); |
2925 | if (ret) { | |
2926 | write_index = 0; | |
2927 | goto error_put_subbuf; | |
2928 | } | |
2929 | ||
a587bd64 JG |
2930 | subbuf_view = lttng_buffer_view_init(subbuf_addr, 0, len); |
2931 | ||
d41f73b7 | 2932 | /* write the subbuffer to the tracefile */ |
276cd1d7 | 2933 | ret = lttng_consumer_on_read_subbuffer_mmap( |
a587bd64 | 2934 | ctx, stream, &subbuf_view, padding, &index); |
91dfef6e | 2935 | /* |
276cd1d7 JG |
2936 | * The mmap operation should write subbuf_size amount of data when |
2937 | * network streaming or the full padding (len) size when we are _not_ | |
2938 | * streaming. | |
91dfef6e | 2939 | */ |
d88aee68 DG |
2940 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
2941 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
d41f73b7 | 2942 | /* |
91dfef6e | 2943 | * Display the error but continue processing to try to release the |
c5c45efa DG |
2944 | * subbuffer. This is a DBG statement since any unexpected kill or |
2945 | * signal, the application gets unregistered, relayd gets closed or | |
2946 | * anything that affects the buffer lifetime will trigger this error. | |
2947 | * So, for the sake of the user, don't print this error since it can | |
2948 | * happen and it is OK with the code flow. | |
d41f73b7 | 2949 | */ |
c5c45efa | 2950 | DBG("Error writing to tracefile " |
8fd623e0 | 2951 | "(ret: %ld != len: %lu != subbuf_size: %lu)", |
91dfef6e | 2952 | ret, len, subbuf_size); |
309167d2 | 2953 | write_index = 0; |
d41f73b7 | 2954 | } |
276cd1d7 | 2955 | error_put_subbuf: |
ffe60014 | 2956 | err = ustctl_put_next_subbuf(ustream); |
effcf122 | 2957 | assert(err == 0); |
331744e3 | 2958 | |
02b3d176 DG |
2959 | /* |
2960 | * This will consumer the byte on the wait_fd if and only if there is not | |
2961 | * next subbuffer to be acquired. | |
2962 | */ | |
2963 | if (!stream->metadata_flag) { | |
2964 | ret = notify_if_more_data(stream, ctx); | |
2965 | if (ret < 0) { | |
02d02e31 | 2966 | goto error; |
02b3d176 DG |
2967 | } |
2968 | } | |
2969 | ||
309167d2 | 2970 | /* Write index if needed. */ |
1c20f0e2 | 2971 | if (!write_index) { |
02d02e31 | 2972 | goto rotate; |
1c20f0e2 JD |
2973 | } |
2974 | ||
94d49140 JD |
2975 | if (stream->chan->live_timer_interval && !stream->metadata_flag) { |
2976 | /* | |
2977 | * In live, block until all the metadata is sent. | |
2978 | */ | |
c585821b MD |
2979 | pthread_mutex_lock(&stream->metadata_timer_lock); |
2980 | assert(!stream->missed_metadata_flush); | |
2981 | stream->waiting_on_metadata = true; | |
2982 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
2983 | ||
94d49140 | 2984 | err = consumer_stream_sync_metadata(ctx, stream->session_id); |
c585821b MD |
2985 | |
2986 | pthread_mutex_lock(&stream->metadata_timer_lock); | |
2987 | stream->waiting_on_metadata = false; | |
2988 | if (stream->missed_metadata_flush) { | |
2989 | stream->missed_metadata_flush = false; | |
2990 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
2991 | (void) consumer_flush_ust_index(stream); | |
2992 | } else { | |
2993 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
2994 | } | |
2995 | ||
94d49140 | 2996 | if (err < 0) { |
02d02e31 | 2997 | goto error; |
94d49140 JD |
2998 | } |
2999 | } | |
3000 | ||
1c20f0e2 JD |
3001 | assert(!stream->metadata_flag); |
3002 | err = consumer_stream_write_index(stream, &index); | |
3003 | if (err < 0) { | |
02d02e31 | 3004 | goto error; |
309167d2 JD |
3005 | } |
3006 | ||
02d02e31 JD |
3007 | rotate: |
3008 | /* | |
3009 | * After extracting the packet, we check if the stream is now ready to be | |
3010 | * rotated and perform the action immediately. | |
3011 | */ | |
3012 | rotation_ret = lttng_consumer_stream_is_rotate_ready(stream); | |
3013 | if (rotation_ret == 1) { | |
d2956687 | 3014 | rotation_ret = lttng_consumer_rotate_stream(ctx, stream); |
02d02e31 JD |
3015 | if (rotation_ret < 0) { |
3016 | ERR("Stream rotation error"); | |
3017 | ret = -1; | |
3018 | goto error; | |
3019 | } | |
3020 | } else if (rotation_ret < 0) { | |
3021 | ERR("Checking if stream is ready to rotate"); | |
3022 | ret = -1; | |
3023 | goto error; | |
3024 | } | |
3025 | error: | |
d41f73b7 MD |
3026 | return ret; |
3027 | } | |
3028 | ||
ffe60014 DG |
3029 | /* |
3030 | * Called when a stream is created. | |
fe4477ee JD |
3031 | * |
3032 | * Return 0 on success or else a negative value. | |
ffe60014 | 3033 | */ |
d41f73b7 MD |
3034 | int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream) |
3035 | { | |
fe4477ee JD |
3036 | int ret; |
3037 | ||
10a50311 JD |
3038 | assert(stream); |
3039 | ||
d2956687 JG |
3040 | /* |
3041 | * Don't create anything if this is set for streaming or if there is | |
3042 | * no current trace chunk on the parent channel. | |
3043 | */ | |
3044 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor && | |
3045 | stream->chan->trace_chunk) { | |
3046 | ret = consumer_stream_create_output_files(stream, true); | |
3047 | if (ret) { | |
fe4477ee JD |
3048 | goto error; |
3049 | } | |
fe4477ee JD |
3050 | } |
3051 | ret = 0; | |
3052 | ||
3053 | error: | |
3054 | return ret; | |
d41f73b7 | 3055 | } |
ca22feea DG |
3056 | |
3057 | /* | |
3058 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
3059 | * stream. Consumer data lock MUST be acquired before calling this function |
3060 | * and the stream lock. | |
ca22feea | 3061 | * |
6d805429 | 3062 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
3063 | * data is available for trace viewer reading. |
3064 | */ | |
6d805429 | 3065 | int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
3066 | { |
3067 | int ret; | |
3068 | ||
3069 | assert(stream); | |
ffe60014 | 3070 | assert(stream->ustream); |
ca22feea | 3071 | |
6d805429 | 3072 | DBG("UST consumer checking data pending"); |
c8f59ee5 | 3073 | |
ca6b395f MD |
3074 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
3075 | ret = 0; | |
3076 | goto end; | |
3077 | } | |
3078 | ||
04ef1097 | 3079 | if (stream->chan->type == CONSUMER_CHANNEL_TYPE_METADATA) { |
e6ee4eab DG |
3080 | uint64_t contiguous, pushed; |
3081 | ||
3082 | /* Ease our life a bit. */ | |
c585821b | 3083 | contiguous = stream->chan->metadata_cache->max_offset; |
e6ee4eab DG |
3084 | pushed = stream->ust_metadata_pushed; |
3085 | ||
04ef1097 MD |
3086 | /* |
3087 | * We can simply check whether all contiguously available data | |
3088 | * has been pushed to the ring buffer, since the push operation | |
3089 | * is performed within get_next_subbuf(), and because both | |
3090 | * get_next_subbuf() and put_next_subbuf() are issued atomically | |
3091 | * thanks to the stream lock within | |
3092 | * lttng_ustconsumer_read_subbuffer(). This basically means that | |
3093 | * whetnever ust_metadata_pushed is incremented, the associated | |
3094 | * metadata has been consumed from the metadata stream. | |
3095 | */ | |
3096 | DBG("UST consumer metadata pending check: contiguous %" PRIu64 " vs pushed %" PRIu64, | |
e6ee4eab | 3097 | contiguous, pushed); |
aa01b94c | 3098 | assert(((int64_t) (contiguous - pushed)) >= 0); |
e6ee4eab | 3099 | if ((contiguous != pushed) || |
6acdf328 | 3100 | (((int64_t) contiguous - pushed) > 0 || contiguous == 0)) { |
04ef1097 MD |
3101 | ret = 1; /* Data is pending */ |
3102 | goto end; | |
3103 | } | |
3104 | } else { | |
3105 | ret = ustctl_get_next_subbuf(stream->ustream); | |
3106 | if (ret == 0) { | |
3107 | /* | |
3108 | * There is still data so let's put back this | |
3109 | * subbuffer. | |
3110 | */ | |
3111 | ret = ustctl_put_subbuf(stream->ustream); | |
3112 | assert(ret == 0); | |
3113 | ret = 1; /* Data is pending */ | |
3114 | goto end; | |
3115 | } | |
ca22feea DG |
3116 | } |
3117 | ||
6d805429 DG |
3118 | /* Data is NOT pending so ready to be read. */ |
3119 | ret = 0; | |
ca22feea | 3120 | |
6efae65e DG |
3121 | end: |
3122 | return ret; | |
ca22feea | 3123 | } |
d88aee68 | 3124 | |
6d574024 DG |
3125 | /* |
3126 | * Stop a given metadata channel timer if enabled and close the wait fd which | |
3127 | * is the poll pipe of the metadata stream. | |
3128 | * | |
d2c82a5a | 3129 | * This MUST be called with the metadata channel lock acquired. |
6d574024 DG |
3130 | */ |
3131 | void lttng_ustconsumer_close_metadata(struct lttng_consumer_channel *metadata) | |
3132 | { | |
3133 | int ret; | |
3134 | ||
3135 | assert(metadata); | |
3136 | assert(metadata->type == CONSUMER_CHANNEL_TYPE_METADATA); | |
3137 | ||
3138 | DBG("Closing metadata channel key %" PRIu64, metadata->key); | |
3139 | ||
3140 | if (metadata->switch_timer_enabled == 1) { | |
3141 | consumer_timer_switch_stop(metadata); | |
3142 | } | |
3143 | ||
3144 | if (!metadata->metadata_stream) { | |
3145 | goto end; | |
3146 | } | |
3147 | ||
3148 | /* | |
3149 | * Closing write side so the thread monitoring the stream wakes up if any | |
3150 | * and clean the metadata stream. | |
3151 | */ | |
3152 | if (metadata->metadata_stream->ust_metadata_poll_pipe[1] >= 0) { | |
3153 | ret = close(metadata->metadata_stream->ust_metadata_poll_pipe[1]); | |
3154 | if (ret < 0) { | |
3155 | PERROR("closing metadata pipe write side"); | |
3156 | } | |
3157 | metadata->metadata_stream->ust_metadata_poll_pipe[1] = -1; | |
3158 | } | |
3159 | ||
3160 | end: | |
3161 | return; | |
3162 | } | |
3163 | ||
d88aee68 DG |
3164 | /* |
3165 | * Close every metadata stream wait fd of the metadata hash table. This | |
3166 | * function MUST be used very carefully so not to run into a race between the | |
3167 | * metadata thread handling streams and this function closing their wait fd. | |
3168 | * | |
3169 | * For UST, this is used when the session daemon hangs up. Its the metadata | |
3170 | * producer so calling this is safe because we are assured that no state change | |
3171 | * can occur in the metadata thread for the streams in the hash table. | |
3172 | */ | |
6d574024 | 3173 | void lttng_ustconsumer_close_all_metadata(struct lttng_ht *metadata_ht) |
d88aee68 | 3174 | { |
d88aee68 DG |
3175 | struct lttng_ht_iter iter; |
3176 | struct lttng_consumer_stream *stream; | |
3177 | ||
3178 | assert(metadata_ht); | |
3179 | assert(metadata_ht->ht); | |
3180 | ||
3181 | DBG("UST consumer closing all metadata streams"); | |
3182 | ||
3183 | rcu_read_lock(); | |
3184 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, | |
3185 | node.node) { | |
9ce5646a MD |
3186 | |
3187 | health_code_update(); | |
3188 | ||
be2b50c7 | 3189 | pthread_mutex_lock(&stream->chan->lock); |
6d574024 | 3190 | lttng_ustconsumer_close_metadata(stream->chan); |
be2b50c7 DG |
3191 | pthread_mutex_unlock(&stream->chan->lock); |
3192 | ||
d88aee68 DG |
3193 | } |
3194 | rcu_read_unlock(); | |
3195 | } | |
d8ef542d MD |
3196 | |
3197 | void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream) | |
3198 | { | |
3199 | int ret; | |
3200 | ||
3201 | ret = ustctl_stream_close_wakeup_fd(stream->ustream); | |
3202 | if (ret < 0) { | |
3203 | ERR("Unable to close wakeup fd"); | |
3204 | } | |
3205 | } | |
331744e3 | 3206 | |
f666ae70 MD |
3207 | /* |
3208 | * Please refer to consumer-timer.c before adding any lock within this | |
3209 | * function or any of its callees. Timers have a very strict locking | |
3210 | * semantic with respect to teardown. Failure to respect this semantic | |
3211 | * introduces deadlocks. | |
c585821b MD |
3212 | * |
3213 | * DON'T hold the metadata lock when calling this function, else this | |
3214 | * can cause deadlock involving consumer awaiting for metadata to be | |
3215 | * pushed out due to concurrent interaction with the session daemon. | |
f666ae70 | 3216 | */ |
331744e3 | 3217 | int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx, |
94d49140 | 3218 | struct lttng_consumer_channel *channel, int timer, int wait) |
331744e3 JD |
3219 | { |
3220 | struct lttcomm_metadata_request_msg request; | |
3221 | struct lttcomm_consumer_msg msg; | |
0c759fc9 | 3222 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
93ec662e | 3223 | uint64_t len, key, offset, version; |
331744e3 JD |
3224 | int ret; |
3225 | ||
3226 | assert(channel); | |
3227 | assert(channel->metadata_cache); | |
3228 | ||
53efb85a MD |
3229 | memset(&request, 0, sizeof(request)); |
3230 | ||
331744e3 JD |
3231 | /* send the metadata request to sessiond */ |
3232 | switch (consumer_data.type) { | |
3233 | case LTTNG_CONSUMER64_UST: | |
3234 | request.bits_per_long = 64; | |
3235 | break; | |
3236 | case LTTNG_CONSUMER32_UST: | |
3237 | request.bits_per_long = 32; | |
3238 | break; | |
3239 | default: | |
3240 | request.bits_per_long = 0; | |
3241 | break; | |
3242 | } | |
3243 | ||
3244 | request.session_id = channel->session_id; | |
1950109e | 3245 | request.session_id_per_pid = channel->session_id_per_pid; |
567eb353 DG |
3246 | /* |
3247 | * Request the application UID here so the metadata of that application can | |
3248 | * be sent back. The channel UID corresponds to the user UID of the session | |
3249 | * used for the rights on the stream file(s). | |
3250 | */ | |
3251 | request.uid = channel->ust_app_uid; | |
331744e3 | 3252 | request.key = channel->key; |
567eb353 | 3253 | |
1950109e | 3254 | DBG("Sending metadata request to sessiond, session id %" PRIu64 |
3e25d926 | 3255 | ", per-pid %" PRIu64 ", app UID %u and channel key %" PRIu64, |
567eb353 DG |
3256 | request.session_id, request.session_id_per_pid, request.uid, |
3257 | request.key); | |
331744e3 | 3258 | |
75d83e50 | 3259 | pthread_mutex_lock(&ctx->metadata_socket_lock); |
9ce5646a MD |
3260 | |
3261 | health_code_update(); | |
3262 | ||
331744e3 JD |
3263 | ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request, |
3264 | sizeof(request)); | |
3265 | if (ret < 0) { | |
3266 | ERR("Asking metadata to sessiond"); | |
3267 | goto end; | |
3268 | } | |
3269 | ||
9ce5646a MD |
3270 | health_code_update(); |
3271 | ||
331744e3 JD |
3272 | /* Receive the metadata from sessiond */ |
3273 | ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg, | |
3274 | sizeof(msg)); | |
3275 | if (ret != sizeof(msg)) { | |
8fd623e0 | 3276 | DBG("Consumer received unexpected message size %d (expects %zu)", |
331744e3 JD |
3277 | ret, sizeof(msg)); |
3278 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); | |
3279 | /* | |
3280 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
3281 | * since the caller handles this. | |
3282 | */ | |
3283 | goto end; | |
3284 | } | |
3285 | ||
9ce5646a MD |
3286 | health_code_update(); |
3287 | ||
331744e3 JD |
3288 | if (msg.cmd_type == LTTNG_ERR_UND) { |
3289 | /* No registry found */ | |
3290 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, | |
3291 | ret_code); | |
3292 | ret = 0; | |
3293 | goto end; | |
3294 | } else if (msg.cmd_type != LTTNG_CONSUMER_PUSH_METADATA) { | |
3295 | ERR("Unexpected cmd_type received %d", msg.cmd_type); | |
3296 | ret = -1; | |
3297 | goto end; | |
3298 | } | |
3299 | ||
3300 | len = msg.u.push_metadata.len; | |
3301 | key = msg.u.push_metadata.key; | |
3302 | offset = msg.u.push_metadata.target_offset; | |
93ec662e | 3303 | version = msg.u.push_metadata.version; |
331744e3 JD |
3304 | |
3305 | assert(key == channel->key); | |
3306 | if (len == 0) { | |
3307 | DBG("No new metadata to receive for key %" PRIu64, key); | |
3308 | } | |
3309 | ||
9ce5646a MD |
3310 | health_code_update(); |
3311 | ||
331744e3 JD |
3312 | /* Tell session daemon we are ready to receive the metadata. */ |
3313 | ret = consumer_send_status_msg(ctx->consumer_metadata_socket, | |
0c759fc9 | 3314 | LTTCOMM_CONSUMERD_SUCCESS); |
331744e3 JD |
3315 | if (ret < 0 || len == 0) { |
3316 | /* | |
3317 | * Somehow, the session daemon is not responding anymore or there is | |
3318 | * nothing to receive. | |
3319 | */ | |
3320 | goto end; | |
3321 | } | |
3322 | ||
9ce5646a MD |
3323 | health_code_update(); |
3324 | ||
1eb682be | 3325 | ret = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket, |
93ec662e | 3326 | key, offset, len, version, channel, timer, wait); |
1eb682be | 3327 | if (ret >= 0) { |
f2a444f1 DG |
3328 | /* |
3329 | * Only send the status msg if the sessiond is alive meaning a positive | |
3330 | * ret code. | |
3331 | */ | |
1eb682be | 3332 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret); |
f2a444f1 | 3333 | } |
331744e3 JD |
3334 | ret = 0; |
3335 | ||
3336 | end: | |
9ce5646a MD |
3337 | health_code_update(); |
3338 | ||
75d83e50 | 3339 | pthread_mutex_unlock(&ctx->metadata_socket_lock); |
331744e3 JD |
3340 | return ret; |
3341 | } | |
70190e1c DG |
3342 | |
3343 | /* | |
3344 | * Return the ustctl call for the get stream id. | |
3345 | */ | |
3346 | int lttng_ustconsumer_get_stream_id(struct lttng_consumer_stream *stream, | |
3347 | uint64_t *stream_id) | |
3348 | { | |
3349 | assert(stream); | |
3350 | assert(stream_id); | |
3351 | ||
3352 | return ustctl_get_stream_id(stream->ustream, stream_id); | |
3353 | } |