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 | ||
6c1c0768 | 10 | #define _LGPL_SOURCE |
3bd1e081 | 11 | #include <assert.h> |
f02e1e8a | 12 | #include <lttng/ust-ctl.h> |
d85707b0 | 13 | #include <lttng/ust-sigbus.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> |
6f9449c2 | 27 | #include <stdint.h> |
0857097f | 28 | |
51a9e1c7 | 29 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 30 | #include <common/common.h> |
10a8a223 | 31 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 32 | #include <common/relayd/relayd.h> |
dbb5dfe6 | 33 | #include <common/compat/fcntl.h> |
f263b7fd | 34 | #include <common/compat/endian.h> |
c8fea79c JR |
35 | #include <common/consumer/consumer-metadata-cache.h> |
36 | #include <common/consumer/consumer-stream.h> | |
37 | #include <common/consumer/consumer-timer.h> | |
fe4477ee | 38 | #include <common/utils.h> |
309167d2 | 39 | #include <common/index/index.h> |
6f9449c2 | 40 | #include <common/consumer/consumer.h> |
b7fc068d | 41 | #include <common/shm.h> |
f5ba75b4 | 42 | #include <common/optional.h> |
10a8a223 DG |
43 | |
44 | #include "ust-consumer.h" | |
3bd1e081 | 45 | |
45863397 | 46 | #define INT_MAX_STR_LEN 12 /* includes \0 */ |
4628484a | 47 | |
fa29bfbf | 48 | extern struct lttng_consumer_global_data the_consumer_data; |
3bd1e081 | 49 | extern int consumer_poll_timeout; |
3bd1e081 | 50 | |
d85707b0 MD |
51 | DEFINE_LTTNG_UST_SIGBUS_STATE(); |
52 | ||
3bd1e081 | 53 | /* |
ffe60014 DG |
54 | * Free channel object and all streams associated with it. This MUST be used |
55 | * only and only if the channel has _NEVER_ been added to the global channel | |
56 | * hash table. | |
3bd1e081 | 57 | */ |
ffe60014 | 58 | static void destroy_channel(struct lttng_consumer_channel *channel) |
3bd1e081 | 59 | { |
ffe60014 DG |
60 | struct lttng_consumer_stream *stream, *stmp; |
61 | ||
62 | assert(channel); | |
63 | ||
64 | DBG("UST consumer cleaning stream list"); | |
65 | ||
66 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
67 | send_node) { | |
9ce5646a MD |
68 | |
69 | health_code_update(); | |
70 | ||
ffe60014 | 71 | cds_list_del(&stream->send_node); |
b623cb6a | 72 | lttng_ust_ctl_destroy_stream(stream->ustream); |
d2956687 | 73 | lttng_trace_chunk_put(stream->trace_chunk); |
ffe60014 DG |
74 | free(stream); |
75 | } | |
76 | ||
77 | /* | |
78 | * If a channel is available meaning that was created before the streams | |
79 | * were, delete it. | |
80 | */ | |
81 | if (channel->uchan) { | |
82 | lttng_ustconsumer_del_channel(channel); | |
b83e03c4 | 83 | lttng_ustconsumer_free_channel(channel); |
ffe60014 | 84 | } |
88ebf5a7 JR |
85 | |
86 | if (channel->trace_chunk) { | |
87 | lttng_trace_chunk_put(channel->trace_chunk); | |
88 | } | |
89 | ||
ffe60014 DG |
90 | free(channel); |
91 | } | |
3bd1e081 MD |
92 | |
93 | /* | |
ffe60014 | 94 | * Add channel to internal consumer state. |
3bd1e081 | 95 | * |
ffe60014 | 96 | * Returns 0 on success or else a negative value. |
3bd1e081 | 97 | */ |
ffe60014 DG |
98 | static int add_channel(struct lttng_consumer_channel *channel, |
99 | struct lttng_consumer_local_data *ctx) | |
3bd1e081 MD |
100 | { |
101 | int ret = 0; | |
102 | ||
ffe60014 DG |
103 | assert(channel); |
104 | assert(ctx); | |
105 | ||
106 | if (ctx->on_recv_channel != NULL) { | |
107 | ret = ctx->on_recv_channel(channel); | |
108 | if (ret == 0) { | |
d8ef542d | 109 | ret = consumer_add_channel(channel, ctx); |
ffe60014 DG |
110 | } else if (ret < 0) { |
111 | /* Most likely an ENOMEM. */ | |
112 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
113 | goto error; | |
114 | } | |
115 | } else { | |
d8ef542d | 116 | ret = consumer_add_channel(channel, ctx); |
3bd1e081 MD |
117 | } |
118 | ||
d88aee68 | 119 | DBG("UST consumer channel added (key: %" PRIu64 ")", channel->key); |
ffe60014 DG |
120 | |
121 | error: | |
3bd1e081 MD |
122 | return ret; |
123 | } | |
124 | ||
ffe60014 DG |
125 | /* |
126 | * Allocate and return a consumer stream object. If _alloc_ret is not NULL, the | |
127 | * error value if applicable is set in it else it is kept untouched. | |
3bd1e081 | 128 | * |
ffe60014 | 129 | * Return NULL on error else the newly allocated stream object. |
3bd1e081 | 130 | */ |
ffe60014 DG |
131 | static struct lttng_consumer_stream *allocate_stream(int cpu, int key, |
132 | struct lttng_consumer_channel *channel, | |
d2956687 | 133 | struct lttng_consumer_local_data *ctx, int *_alloc_ret) |
ffe60014 DG |
134 | { |
135 | int alloc_ret; | |
136 | struct lttng_consumer_stream *stream = NULL; | |
137 | ||
138 | assert(channel); | |
139 | assert(ctx); | |
140 | ||
6f9449c2 | 141 | stream = consumer_stream_create( |
49f45573 JG |
142 | channel, |
143 | channel->key, | |
ffe60014 | 144 | key, |
ffe60014 | 145 | channel->name, |
ffe60014 DG |
146 | channel->relayd_id, |
147 | channel->session_id, | |
d2956687 | 148 | channel->trace_chunk, |
ffe60014 DG |
149 | cpu, |
150 | &alloc_ret, | |
4891ece8 | 151 | channel->type, |
d2956687 | 152 | channel->monitor); |
ffe60014 DG |
153 | if (stream == NULL) { |
154 | switch (alloc_ret) { | |
155 | case -ENOENT: | |
156 | /* | |
157 | * We could not find the channel. Can happen if cpu hotplug | |
158 | * happens while tearing down. | |
159 | */ | |
160 | DBG3("Could not find channel"); | |
161 | break; | |
162 | case -ENOMEM: | |
163 | case -EINVAL: | |
164 | default: | |
165 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
166 | break; | |
167 | } | |
168 | goto error; | |
169 | } | |
170 | ||
d9a2e16e | 171 | consumer_stream_update_channel_attributes(stream, channel); |
ffe60014 DG |
172 | |
173 | error: | |
174 | if (_alloc_ret) { | |
175 | *_alloc_ret = alloc_ret; | |
176 | } | |
177 | return stream; | |
178 | } | |
179 | ||
180 | /* | |
181 | * Send the given stream pointer to the corresponding thread. | |
182 | * | |
183 | * Returns 0 on success else a negative value. | |
184 | */ | |
185 | static int send_stream_to_thread(struct lttng_consumer_stream *stream, | |
186 | struct lttng_consumer_local_data *ctx) | |
187 | { | |
dae10966 DG |
188 | int ret; |
189 | struct lttng_pipe *stream_pipe; | |
ffe60014 DG |
190 | |
191 | /* Get the right pipe where the stream will be sent. */ | |
192 | if (stream->metadata_flag) { | |
66d583dc | 193 | consumer_add_metadata_stream(stream); |
dae10966 | 194 | stream_pipe = ctx->consumer_metadata_pipe; |
ffe60014 | 195 | } else { |
66d583dc | 196 | consumer_add_data_stream(stream); |
dae10966 | 197 | stream_pipe = ctx->consumer_data_pipe; |
ffe60014 DG |
198 | } |
199 | ||
5ab66908 MD |
200 | /* |
201 | * From this point on, the stream's ownership has been moved away from | |
a8086cf4 JR |
202 | * the channel and it becomes globally visible. Hence, remove it from |
203 | * the local stream list to prevent the stream from being both local and | |
204 | * global. | |
5ab66908 MD |
205 | */ |
206 | stream->globally_visible = 1; | |
a8086cf4 | 207 | cds_list_del(&stream->send_node); |
5ab66908 | 208 | |
dae10966 | 209 | ret = lttng_pipe_write(stream_pipe, &stream, sizeof(stream)); |
ffe60014 | 210 | if (ret < 0) { |
dae10966 DG |
211 | ERR("Consumer write %s stream to pipe %d", |
212 | stream->metadata_flag ? "metadata" : "data", | |
213 | lttng_pipe_get_writefd(stream_pipe)); | |
5ab66908 MD |
214 | if (stream->metadata_flag) { |
215 | consumer_del_stream_for_metadata(stream); | |
216 | } else { | |
217 | consumer_del_stream_for_data(stream); | |
218 | } | |
a8086cf4 | 219 | goto error; |
ffe60014 | 220 | } |
a8086cf4 | 221 | |
5ab66908 | 222 | error: |
ffe60014 DG |
223 | return ret; |
224 | } | |
225 | ||
4628484a MD |
226 | static |
227 | int get_stream_shm_path(char *stream_shm_path, const char *shm_path, int cpu) | |
228 | { | |
45863397 | 229 | char cpu_nr[INT_MAX_STR_LEN]; /* int max len */ |
4628484a MD |
230 | int ret; |
231 | ||
232 | strncpy(stream_shm_path, shm_path, PATH_MAX); | |
233 | stream_shm_path[PATH_MAX - 1] = '\0'; | |
45863397 | 234 | ret = snprintf(cpu_nr, INT_MAX_STR_LEN, "%i", cpu); |
67f8cb8d MD |
235 | if (ret < 0) { |
236 | PERROR("snprintf"); | |
4628484a MD |
237 | goto end; |
238 | } | |
239 | strncat(stream_shm_path, cpu_nr, | |
240 | PATH_MAX - strlen(stream_shm_path) - 1); | |
241 | ret = 0; | |
242 | end: | |
243 | return ret; | |
244 | } | |
245 | ||
d88aee68 DG |
246 | /* |
247 | * Create streams for the given channel using liblttng-ust-ctl. | |
d2956687 | 248 | * The channel lock must be acquired by the caller. |
d88aee68 DG |
249 | * |
250 | * Return 0 on success else a negative value. | |
251 | */ | |
ffe60014 | 252 | static int create_ust_streams(struct lttng_consumer_channel *channel, |
d2956687 | 253 | struct lttng_consumer_local_data *ctx) |
ffe60014 DG |
254 | { |
255 | int ret, cpu = 0; | |
b623cb6a | 256 | struct lttng_ust_ctl_consumer_stream *ustream; |
ffe60014 | 257 | struct lttng_consumer_stream *stream; |
d2956687 | 258 | pthread_mutex_t *current_stream_lock = NULL; |
ffe60014 DG |
259 | |
260 | assert(channel); | |
261 | assert(ctx); | |
262 | ||
263 | /* | |
264 | * While a stream is available from ustctl. When NULL is returned, we've | |
265 | * reached the end of the possible stream for the channel. | |
266 | */ | |
b623cb6a | 267 | while ((ustream = lttng_ust_ctl_create_stream(channel->uchan, cpu))) { |
ffe60014 | 268 | int wait_fd; |
04ef1097 | 269 | int ust_metadata_pipe[2]; |
ffe60014 | 270 | |
9ce5646a MD |
271 | health_code_update(); |
272 | ||
04ef1097 MD |
273 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && channel->monitor) { |
274 | ret = utils_create_pipe_cloexec_nonblock(ust_metadata_pipe); | |
275 | if (ret < 0) { | |
276 | ERR("Create ust metadata poll pipe"); | |
277 | goto error; | |
278 | } | |
279 | wait_fd = ust_metadata_pipe[0]; | |
280 | } else { | |
b623cb6a | 281 | wait_fd = lttng_ust_ctl_stream_get_wait_fd(ustream); |
04ef1097 | 282 | } |
ffe60014 DG |
283 | |
284 | /* Allocate consumer stream object. */ | |
d2956687 | 285 | stream = allocate_stream(cpu, wait_fd, channel, ctx, &ret); |
ffe60014 DG |
286 | if (!stream) { |
287 | goto error_alloc; | |
288 | } | |
289 | stream->ustream = ustream; | |
290 | /* | |
291 | * Store it so we can save multiple function calls afterwards since | |
292 | * this value is used heavily in the stream threads. This is UST | |
293 | * specific so this is why it's done after allocation. | |
294 | */ | |
295 | stream->wait_fd = wait_fd; | |
296 | ||
b31398bb DG |
297 | /* |
298 | * Increment channel refcount since the channel reference has now been | |
299 | * assigned in the allocation process above. | |
300 | */ | |
10a50311 JD |
301 | if (stream->chan->monitor) { |
302 | uatomic_inc(&stream->chan->refcount); | |
303 | } | |
b31398bb | 304 | |
d2956687 JG |
305 | pthread_mutex_lock(&stream->lock); |
306 | current_stream_lock = &stream->lock; | |
ffe60014 DG |
307 | /* |
308 | * Order is important this is why a list is used. On error, the caller | |
309 | * should clean this list. | |
310 | */ | |
311 | cds_list_add_tail(&stream->send_node, &channel->streams.head); | |
312 | ||
b623cb6a | 313 | ret = lttng_ust_ctl_get_max_subbuf_size(stream->ustream, |
ffe60014 DG |
314 | &stream->max_sb_size); |
315 | if (ret < 0) { | |
b623cb6a | 316 | ERR("lttng_ust_ctl_get_max_subbuf_size failed for stream %s", |
ffe60014 DG |
317 | stream->name); |
318 | goto error; | |
319 | } | |
320 | ||
321 | /* Do actions once stream has been received. */ | |
322 | if (ctx->on_recv_stream) { | |
323 | ret = ctx->on_recv_stream(stream); | |
324 | if (ret < 0) { | |
325 | goto error; | |
326 | } | |
327 | } | |
328 | ||
d88aee68 | 329 | DBG("UST consumer add stream %s (key: %" PRIu64 ") with relayd id %" PRIu64, |
ffe60014 DG |
330 | stream->name, stream->key, stream->relayd_stream_id); |
331 | ||
332 | /* Set next CPU stream. */ | |
333 | channel->streams.count = ++cpu; | |
d88aee68 DG |
334 | |
335 | /* Keep stream reference when creating metadata. */ | |
336 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) { | |
337 | channel->metadata_stream = stream; | |
8de4f941 JG |
338 | if (channel->monitor) { |
339 | /* Set metadata poll pipe if we created one */ | |
340 | memcpy(stream->ust_metadata_poll_pipe, | |
341 | ust_metadata_pipe, | |
342 | sizeof(ust_metadata_pipe)); | |
343 | } | |
d88aee68 | 344 | } |
d2956687 JG |
345 | pthread_mutex_unlock(&stream->lock); |
346 | current_stream_lock = NULL; | |
ffe60014 DG |
347 | } |
348 | ||
349 | return 0; | |
350 | ||
351 | error: | |
352 | error_alloc: | |
d2956687 JG |
353 | if (current_stream_lock) { |
354 | pthread_mutex_unlock(current_stream_lock); | |
355 | } | |
ffe60014 DG |
356 | return ret; |
357 | } | |
358 | ||
d2956687 JG |
359 | static int open_ust_stream_fd(struct lttng_consumer_channel *channel, int cpu, |
360 | const struct lttng_credentials *session_credentials) | |
4628484a MD |
361 | { |
362 | char shm_path[PATH_MAX]; | |
363 | int ret; | |
364 | ||
365 | if (!channel->shm_path[0]) { | |
b7fc068d | 366 | return shm_create_anonymous("ust-consumer"); |
4628484a MD |
367 | } |
368 | ret = get_stream_shm_path(shm_path, channel->shm_path, cpu); | |
369 | if (ret) { | |
370 | goto error_shm_path; | |
371 | } | |
372 | return run_as_open(shm_path, | |
373 | O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR, | |
ff588497 JR |
374 | lttng_credentials_get_uid(session_credentials), |
375 | lttng_credentials_get_gid(session_credentials)); | |
4628484a MD |
376 | |
377 | error_shm_path: | |
378 | return -1; | |
379 | } | |
380 | ||
ffe60014 DG |
381 | /* |
382 | * Create an UST channel with the given attributes and send it to the session | |
383 | * daemon using the ust ctl API. | |
384 | * | |
385 | * Return 0 on success or else a negative value. | |
386 | */ | |
4628484a | 387 | static int create_ust_channel(struct lttng_consumer_channel *channel, |
b623cb6a MJ |
388 | struct lttng_ust_ctl_consumer_channel_attr *attr, |
389 | struct lttng_ust_ctl_consumer_channel **ust_chanp) | |
ffe60014 | 390 | { |
4628484a MD |
391 | int ret, nr_stream_fds, i, j; |
392 | int *stream_fds; | |
b623cb6a | 393 | struct lttng_ust_ctl_consumer_channel *ust_channel; |
ffe60014 | 394 | |
4628484a | 395 | assert(channel); |
ffe60014 | 396 | assert(attr); |
4628484a | 397 | assert(ust_chanp); |
d2956687 | 398 | assert(channel->buffer_credentials.is_set); |
ffe60014 DG |
399 | |
400 | DBG3("Creating channel to ustctl with attr: [overwrite: %d, " | |
401 | "subbuf_size: %" PRIu64 ", num_subbuf: %" PRIu64 ", " | |
402 | "switch_timer_interval: %u, read_timer_interval: %u, " | |
403 | "output: %d, type: %d", attr->overwrite, attr->subbuf_size, | |
404 | attr->num_subbuf, attr->switch_timer_interval, | |
405 | attr->read_timer_interval, attr->output, attr->type); | |
406 | ||
4628484a MD |
407 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) |
408 | nr_stream_fds = 1; | |
409 | else | |
b623cb6a | 410 | nr_stream_fds = lttng_ust_ctl_get_nr_stream_per_channel(); |
4628484a MD |
411 | stream_fds = zmalloc(nr_stream_fds * sizeof(*stream_fds)); |
412 | if (!stream_fds) { | |
413 | ret = -1; | |
414 | goto error_alloc; | |
415 | } | |
416 | for (i = 0; i < nr_stream_fds; i++) { | |
d2956687 JG |
417 | stream_fds[i] = open_ust_stream_fd(channel, i, |
418 | &channel->buffer_credentials.value); | |
4628484a MD |
419 | if (stream_fds[i] < 0) { |
420 | ret = -1; | |
421 | goto error_open; | |
422 | } | |
423 | } | |
b623cb6a | 424 | ust_channel = lttng_ust_ctl_create_channel(attr, stream_fds, nr_stream_fds); |
4628484a | 425 | if (!ust_channel) { |
ffe60014 DG |
426 | ret = -1; |
427 | goto error_create; | |
428 | } | |
4628484a MD |
429 | channel->nr_stream_fds = nr_stream_fds; |
430 | channel->stream_fds = stream_fds; | |
431 | *ust_chanp = ust_channel; | |
ffe60014 DG |
432 | |
433 | return 0; | |
434 | ||
435 | error_create: | |
4628484a MD |
436 | error_open: |
437 | for (j = i - 1; j >= 0; j--) { | |
438 | int closeret; | |
439 | ||
440 | closeret = close(stream_fds[j]); | |
441 | if (closeret) { | |
442 | PERROR("close"); | |
443 | } | |
444 | if (channel->shm_path[0]) { | |
445 | char shm_path[PATH_MAX]; | |
446 | ||
447 | closeret = get_stream_shm_path(shm_path, | |
448 | channel->shm_path, j); | |
449 | if (closeret) { | |
450 | ERR("Cannot get stream shm path"); | |
451 | } | |
452 | closeret = run_as_unlink(shm_path, | |
ff588497 JR |
453 | lttng_credentials_get_uid(LTTNG_OPTIONAL_GET_PTR( |
454 | channel->buffer_credentials)), | |
455 | lttng_credentials_get_gid(LTTNG_OPTIONAL_GET_PTR( | |
456 | channel->buffer_credentials))); | |
4628484a | 457 | if (closeret) { |
4628484a MD |
458 | PERROR("unlink %s", shm_path); |
459 | } | |
460 | } | |
461 | } | |
462 | /* Try to rmdir all directories under shm_path root. */ | |
463 | if (channel->root_shm_path[0]) { | |
602766ec | 464 | (void) run_as_rmdir_recursive(channel->root_shm_path, |
ff588497 JR |
465 | lttng_credentials_get_uid(LTTNG_OPTIONAL_GET_PTR( |
466 | channel->buffer_credentials)), | |
467 | lttng_credentials_get_gid(LTTNG_OPTIONAL_GET_PTR( | |
468 | channel->buffer_credentials)), | |
f75c5439 | 469 | LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG); |
4628484a MD |
470 | } |
471 | free(stream_fds); | |
472 | error_alloc: | |
ffe60014 DG |
473 | return ret; |
474 | } | |
475 | ||
d88aee68 DG |
476 | /* |
477 | * Send a single given stream to the session daemon using the sock. | |
478 | * | |
479 | * Return 0 on success else a negative value. | |
480 | */ | |
ffe60014 DG |
481 | static int send_sessiond_stream(int sock, struct lttng_consumer_stream *stream) |
482 | { | |
483 | int ret; | |
484 | ||
485 | assert(stream); | |
486 | assert(sock >= 0); | |
487 | ||
3eb914c0 | 488 | DBG("UST consumer sending stream %" PRIu64 " to sessiond", stream->key); |
ffe60014 DG |
489 | |
490 | /* Send stream to session daemon. */ | |
b623cb6a | 491 | ret = lttng_ust_ctl_send_stream_to_sessiond(sock, stream->ustream); |
ffe60014 DG |
492 | if (ret < 0) { |
493 | goto error; | |
494 | } | |
495 | ||
ffe60014 DG |
496 | error: |
497 | return ret; | |
498 | } | |
499 | ||
500 | /* | |
a3a86f35 | 501 | * Send channel to sessiond and relayd if applicable. |
ffe60014 | 502 | * |
d88aee68 | 503 | * Return 0 on success or else a negative value. |
ffe60014 | 504 | */ |
a3a86f35 | 505 | static int send_channel_to_sessiond_and_relayd(int sock, |
ffe60014 DG |
506 | struct lttng_consumer_channel *channel, |
507 | struct lttng_consumer_local_data *ctx, int *relayd_error) | |
508 | { | |
0c759fc9 | 509 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
ffe60014 | 510 | struct lttng_consumer_stream *stream; |
a4baae1b | 511 | uint64_t net_seq_idx = -1ULL; |
ffe60014 DG |
512 | |
513 | assert(channel); | |
514 | assert(ctx); | |
515 | assert(sock >= 0); | |
516 | ||
517 | DBG("UST consumer sending channel %s to sessiond", channel->name); | |
518 | ||
62285ea4 DG |
519 | if (channel->relayd_id != (uint64_t) -1ULL) { |
520 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
521 | |
522 | health_code_update(); | |
523 | ||
62285ea4 | 524 | /* Try to send the stream to the relayd if one is available. */ |
a3a86f35 JG |
525 | DBG("Sending stream %" PRIu64 " of channel \"%s\" to relayd", |
526 | stream->key, channel->name); | |
62285ea4 DG |
527 | ret = consumer_send_relayd_stream(stream, stream->chan->pathname); |
528 | if (ret < 0) { | |
529 | /* | |
530 | * Flag that the relayd was the problem here probably due to a | |
531 | * communicaton error on the socket. | |
532 | */ | |
533 | if (relayd_error) { | |
534 | *relayd_error = 1; | |
535 | } | |
725d28b2 | 536 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
ffe60014 | 537 | } |
a4baae1b JD |
538 | if (net_seq_idx == -1ULL) { |
539 | net_seq_idx = stream->net_seq_idx; | |
540 | } | |
541 | } | |
f2a444f1 | 542 | } |
ffe60014 | 543 | |
f2a444f1 DG |
544 | /* Inform sessiond that we are about to send channel and streams. */ |
545 | ret = consumer_send_status_msg(sock, ret_code); | |
0c759fc9 | 546 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
547 | /* |
548 | * Either the session daemon is not responding or the relayd died so we | |
549 | * stop now. | |
550 | */ | |
551 | goto error; | |
552 | } | |
553 | ||
554 | /* Send channel to sessiond. */ | |
b623cb6a | 555 | ret = lttng_ust_ctl_send_channel_to_sessiond(sock, channel->uchan); |
f2a444f1 DG |
556 | if (ret < 0) { |
557 | goto error; | |
558 | } | |
559 | ||
b623cb6a | 560 | ret = lttng_ust_ctl_channel_close_wakeup_fd(channel->uchan); |
f2a444f1 DG |
561 | if (ret < 0) { |
562 | goto error; | |
563 | } | |
564 | ||
565 | /* The channel was sent successfully to the sessiond at this point. */ | |
566 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
567 | |
568 | health_code_update(); | |
569 | ||
ffe60014 DG |
570 | /* Send stream to session daemon. */ |
571 | ret = send_sessiond_stream(sock, stream); | |
572 | if (ret < 0) { | |
573 | goto error; | |
574 | } | |
575 | } | |
576 | ||
577 | /* Tell sessiond there is no more stream. */ | |
b623cb6a | 578 | ret = lttng_ust_ctl_send_stream_to_sessiond(sock, NULL); |
ffe60014 DG |
579 | if (ret < 0) { |
580 | goto error; | |
581 | } | |
582 | ||
583 | DBG("UST consumer NULL stream sent to sessiond"); | |
584 | ||
585 | return 0; | |
586 | ||
587 | error: | |
0c759fc9 | 588 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
589 | ret = -1; |
590 | } | |
ffe60014 DG |
591 | return ret; |
592 | } | |
593 | ||
594 | /* | |
595 | * Creates a channel and streams and add the channel it to the channel internal | |
596 | * state. The created stream must ONLY be sent once the GET_CHANNEL command is | |
597 | * received. | |
598 | * | |
599 | * Return 0 on success or else, a negative value is returned and the channel | |
600 | * MUST be destroyed by consumer_del_channel(). | |
601 | */ | |
75cfe9e6 | 602 | static int ask_channel(struct lttng_consumer_local_data *ctx, |
ffe60014 | 603 | struct lttng_consumer_channel *channel, |
b623cb6a | 604 | struct lttng_ust_ctl_consumer_channel_attr *attr) |
3bd1e081 MD |
605 | { |
606 | int ret; | |
607 | ||
ffe60014 DG |
608 | assert(ctx); |
609 | assert(channel); | |
610 | assert(attr); | |
611 | ||
612 | /* | |
613 | * This value is still used by the kernel consumer since for the kernel, | |
614 | * the stream ownership is not IN the consumer so we need to have the | |
615 | * number of left stream that needs to be initialized so we can know when | |
616 | * to delete the channel (see consumer.c). | |
617 | * | |
618 | * As for the user space tracer now, the consumer creates and sends the | |
619 | * stream to the session daemon which only sends them to the application | |
620 | * once every stream of a channel is received making this value useless | |
621 | * because we they will be added to the poll thread before the application | |
622 | * receives them. This ensures that a stream can not hang up during | |
623 | * initilization of a channel. | |
624 | */ | |
625 | channel->nb_init_stream_left = 0; | |
626 | ||
627 | /* The reply msg status is handled in the following call. */ | |
4628484a | 628 | ret = create_ust_channel(channel, attr, &channel->uchan); |
ffe60014 | 629 | if (ret < 0) { |
10a50311 | 630 | goto end; |
3bd1e081 MD |
631 | } |
632 | ||
b623cb6a | 633 | channel->wait_fd = lttng_ust_ctl_channel_get_wait_fd(channel->uchan); |
d8ef542d | 634 | |
10a50311 JD |
635 | /* |
636 | * For the snapshots (no monitor), we create the metadata streams | |
637 | * on demand, not during the channel creation. | |
638 | */ | |
639 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && !channel->monitor) { | |
640 | ret = 0; | |
641 | goto end; | |
642 | } | |
643 | ||
ffe60014 | 644 | /* Open all streams for this channel. */ |
d2956687 JG |
645 | pthread_mutex_lock(&channel->lock); |
646 | ret = create_ust_streams(channel, ctx); | |
647 | pthread_mutex_unlock(&channel->lock); | |
ffe60014 | 648 | if (ret < 0) { |
10a50311 | 649 | goto end; |
ffe60014 DG |
650 | } |
651 | ||
10a50311 | 652 | end: |
3bd1e081 MD |
653 | return ret; |
654 | } | |
655 | ||
d88aee68 DG |
656 | /* |
657 | * Send all stream of a channel to the right thread handling it. | |
658 | * | |
659 | * On error, return a negative value else 0 on success. | |
660 | */ | |
661 | static int send_streams_to_thread(struct lttng_consumer_channel *channel, | |
662 | struct lttng_consumer_local_data *ctx) | |
663 | { | |
664 | int ret = 0; | |
665 | struct lttng_consumer_stream *stream, *stmp; | |
666 | ||
667 | assert(channel); | |
668 | assert(ctx); | |
669 | ||
670 | /* Send streams to the corresponding thread. */ | |
671 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
672 | send_node) { | |
9ce5646a MD |
673 | |
674 | health_code_update(); | |
675 | ||
d88aee68 DG |
676 | /* Sending the stream to the thread. */ |
677 | ret = send_stream_to_thread(stream, ctx); | |
678 | if (ret < 0) { | |
679 | /* | |
680 | * If we are unable to send the stream to the thread, there is | |
681 | * a big problem so just stop everything. | |
682 | */ | |
683 | goto error; | |
684 | } | |
d88aee68 DG |
685 | } |
686 | ||
687 | error: | |
688 | return ret; | |
689 | } | |
690 | ||
7972aab2 DG |
691 | /* |
692 | * Flush channel's streams using the given key to retrieve the channel. | |
693 | * | |
694 | * Return 0 on success else an LTTng error code. | |
695 | */ | |
696 | static int flush_channel(uint64_t chan_key) | |
697 | { | |
698 | int ret = 0; | |
699 | struct lttng_consumer_channel *channel; | |
700 | struct lttng_consumer_stream *stream; | |
701 | struct lttng_ht *ht; | |
702 | struct lttng_ht_iter iter; | |
703 | ||
8fd623e0 | 704 | DBG("UST consumer flush channel key %" PRIu64, chan_key); |
7972aab2 | 705 | |
a500c257 | 706 | rcu_read_lock(); |
7972aab2 DG |
707 | channel = consumer_find_channel(chan_key); |
708 | if (!channel) { | |
8fd623e0 | 709 | ERR("UST consumer flush channel %" PRIu64 " not found", chan_key); |
7972aab2 DG |
710 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
711 | goto error; | |
712 | } | |
713 | ||
fa29bfbf | 714 | ht = the_consumer_data.stream_per_chan_id_ht; |
7972aab2 DG |
715 | |
716 | /* For each stream of the channel id, flush it. */ | |
7972aab2 DG |
717 | cds_lfht_for_each_entry_duplicate(ht->ht, |
718 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
719 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
9ce5646a MD |
720 | |
721 | health_code_update(); | |
722 | ||
0dd01979 | 723 | pthread_mutex_lock(&stream->lock); |
5cfcab67 JR |
724 | |
725 | /* | |
726 | * Protect against concurrent teardown of a stream. | |
727 | */ | |
728 | if (cds_lfht_is_node_deleted(&stream->node.node)) { | |
729 | goto next; | |
730 | } | |
731 | ||
0dd01979 | 732 | if (!stream->quiescent) { |
d85707b0 MD |
733 | ret = lttng_ust_ctl_flush_buffer(stream->ustream, 0); |
734 | if (ret) { | |
735 | ERR("Failed to flush buffer while flushing channel: channel key = %" PRIu64 ", channel name = '%s'", | |
736 | chan_key, channel->name); | |
737 | ret = LTTNG_ERR_BUFFER_FLUSH_FAILED; | |
738 | pthread_mutex_unlock(&stream->lock); | |
739 | goto error; | |
740 | } | |
0dd01979 MD |
741 | stream->quiescent = true; |
742 | } | |
5cfcab67 | 743 | next: |
0dd01979 MD |
744 | pthread_mutex_unlock(&stream->lock); |
745 | } | |
746 | error: | |
747 | rcu_read_unlock(); | |
748 | return ret; | |
749 | } | |
750 | ||
751 | /* | |
752 | * Clear quiescent state from channel's streams using the given key to | |
753 | * retrieve the channel. | |
754 | * | |
755 | * Return 0 on success else an LTTng error code. | |
756 | */ | |
757 | static int clear_quiescent_channel(uint64_t chan_key) | |
758 | { | |
759 | int ret = 0; | |
760 | struct lttng_consumer_channel *channel; | |
761 | struct lttng_consumer_stream *stream; | |
762 | struct lttng_ht *ht; | |
763 | struct lttng_ht_iter iter; | |
764 | ||
765 | DBG("UST consumer clear quiescent channel key %" PRIu64, chan_key); | |
766 | ||
767 | rcu_read_lock(); | |
768 | channel = consumer_find_channel(chan_key); | |
769 | if (!channel) { | |
770 | ERR("UST consumer clear quiescent channel %" PRIu64 " not found", chan_key); | |
771 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
772 | goto error; | |
773 | } | |
774 | ||
fa29bfbf | 775 | ht = the_consumer_data.stream_per_chan_id_ht; |
0dd01979 MD |
776 | |
777 | /* For each stream of the channel id, clear quiescent state. */ | |
778 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
779 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
780 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
781 | ||
782 | health_code_update(); | |
783 | ||
784 | pthread_mutex_lock(&stream->lock); | |
785 | stream->quiescent = false; | |
786 | pthread_mutex_unlock(&stream->lock); | |
7972aab2 | 787 | } |
7972aab2 | 788 | error: |
a500c257 | 789 | rcu_read_unlock(); |
7972aab2 DG |
790 | return ret; |
791 | } | |
792 | ||
d88aee68 DG |
793 | /* |
794 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. | |
795 | * | |
796 | * Return 0 on success else an LTTng error code. | |
797 | */ | |
798 | static int close_metadata(uint64_t chan_key) | |
799 | { | |
ea88ca2a | 800 | int ret = 0; |
d88aee68 | 801 | struct lttng_consumer_channel *channel; |
f65a74be | 802 | unsigned int channel_monitor; |
d88aee68 | 803 | |
8fd623e0 | 804 | DBG("UST consumer close metadata key %" PRIu64, chan_key); |
d88aee68 DG |
805 | |
806 | channel = consumer_find_channel(chan_key); | |
807 | if (!channel) { | |
84cc9aa0 DG |
808 | /* |
809 | * This is possible if the metadata thread has issue a delete because | |
810 | * the endpoint point of the stream hung up. There is no way the | |
811 | * session daemon can know about it thus use a DBG instead of an actual | |
812 | * error. | |
813 | */ | |
814 | DBG("UST consumer close metadata %" PRIu64 " not found", chan_key); | |
d88aee68 DG |
815 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
816 | goto error; | |
817 | } | |
818 | ||
fa29bfbf | 819 | pthread_mutex_lock(&the_consumer_data.lock); |
a9838785 | 820 | pthread_mutex_lock(&channel->lock); |
f65a74be | 821 | channel_monitor = channel->monitor; |
73811ecc DG |
822 | if (cds_lfht_is_node_deleted(&channel->node.node)) { |
823 | goto error_unlock; | |
824 | } | |
825 | ||
6d574024 | 826 | lttng_ustconsumer_close_metadata(channel); |
f65a74be | 827 | pthread_mutex_unlock(&channel->lock); |
fa29bfbf | 828 | pthread_mutex_unlock(&the_consumer_data.lock); |
d88aee68 | 829 | |
f65a74be JG |
830 | /* |
831 | * The ownership of a metadata channel depends on the type of | |
832 | * session to which it belongs. In effect, the monitor flag is checked | |
833 | * to determine if this metadata channel is in "snapshot" mode or not. | |
834 | * | |
835 | * In the non-snapshot case, the metadata channel is created along with | |
836 | * a single stream which will remain present until the metadata channel | |
837 | * is destroyed (on the destruction of its session). In this case, the | |
838 | * metadata stream in "monitored" by the metadata poll thread and holds | |
839 | * the ownership of its channel. | |
840 | * | |
841 | * Closing the metadata will cause the metadata stream's "metadata poll | |
842 | * pipe" to be closed. Closing this pipe will wake-up the metadata poll | |
843 | * thread which will teardown the metadata stream which, in return, | |
844 | * deletes the metadata channel. | |
845 | * | |
846 | * In the snapshot case, the metadata stream is created and destroyed | |
847 | * on every snapshot record. Since the channel doesn't have an owner | |
848 | * other than the session daemon, it is safe to destroy it immediately | |
849 | * on reception of the CLOSE_METADATA command. | |
850 | */ | |
851 | if (!channel_monitor) { | |
852 | /* | |
853 | * The channel and consumer_data locks must be | |
854 | * released before this call since consumer_del_channel | |
855 | * re-acquires the channel and consumer_data locks to teardown | |
856 | * the channel and queue its reclamation by the "call_rcu" | |
857 | * worker thread. | |
858 | */ | |
859 | consumer_del_channel(channel); | |
860 | } | |
861 | ||
862 | return ret; | |
ea88ca2a | 863 | error_unlock: |
a9838785 | 864 | pthread_mutex_unlock(&channel->lock); |
fa29bfbf | 865 | pthread_mutex_unlock(&the_consumer_data.lock); |
d88aee68 DG |
866 | error: |
867 | return ret; | |
868 | } | |
869 | ||
870 | /* | |
871 | * RCU read side lock MUST be acquired before calling this function. | |
872 | * | |
873 | * Return 0 on success else an LTTng error code. | |
874 | */ | |
875 | static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key) | |
876 | { | |
877 | int ret; | |
878 | struct lttng_consumer_channel *metadata; | |
879 | ||
8fd623e0 | 880 | DBG("UST consumer setup metadata key %" PRIu64, key); |
d88aee68 DG |
881 | |
882 | metadata = consumer_find_channel(key); | |
883 | if (!metadata) { | |
884 | ERR("UST consumer push metadata %" PRIu64 " not found", key); | |
885 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
10a50311 JD |
886 | goto end; |
887 | } | |
888 | ||
889 | /* | |
890 | * In no monitor mode, the metadata channel has no stream(s) so skip the | |
891 | * ownership transfer to the metadata thread. | |
892 | */ | |
893 | if (!metadata->monitor) { | |
894 | DBG("Metadata channel in no monitor"); | |
895 | ret = 0; | |
896 | goto end; | |
d88aee68 DG |
897 | } |
898 | ||
899 | /* | |
900 | * Send metadata stream to relayd if one available. Availability is | |
901 | * known if the stream is still in the list of the channel. | |
902 | */ | |
903 | if (cds_list_empty(&metadata->streams.head)) { | |
904 | ERR("Metadata channel key %" PRIu64 ", no stream available.", key); | |
905 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
f5a0c9cf | 906 | goto error_no_stream; |
d88aee68 DG |
907 | } |
908 | ||
909 | /* Send metadata stream to relayd if needed. */ | |
62285ea4 DG |
910 | if (metadata->metadata_stream->net_seq_idx != (uint64_t) -1ULL) { |
911 | ret = consumer_send_relayd_stream(metadata->metadata_stream, | |
912 | metadata->pathname); | |
913 | if (ret < 0) { | |
914 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
915 | goto error; | |
916 | } | |
601262d6 JD |
917 | ret = consumer_send_relayd_streams_sent( |
918 | metadata->metadata_stream->net_seq_idx); | |
919 | if (ret < 0) { | |
920 | ret = LTTCOMM_CONSUMERD_RELAYD_FAIL; | |
921 | goto error; | |
922 | } | |
d88aee68 DG |
923 | } |
924 | ||
a8086cf4 JR |
925 | /* |
926 | * Ownership of metadata stream is passed along. Freeing is handled by | |
927 | * the callee. | |
928 | */ | |
d88aee68 DG |
929 | ret = send_streams_to_thread(metadata, ctx); |
930 | if (ret < 0) { | |
931 | /* | |
932 | * If we are unable to send the stream to the thread, there is | |
933 | * a big problem so just stop everything. | |
934 | */ | |
935 | ret = LTTCOMM_CONSUMERD_FATAL; | |
a8086cf4 | 936 | goto send_streams_error; |
d88aee68 DG |
937 | } |
938 | /* List MUST be empty after or else it could be reused. */ | |
939 | assert(cds_list_empty(&metadata->streams.head)); | |
940 | ||
10a50311 JD |
941 | ret = 0; |
942 | goto end; | |
d88aee68 DG |
943 | |
944 | error: | |
f2a444f1 DG |
945 | /* |
946 | * Delete metadata channel on error. At this point, the metadata stream can | |
947 | * NOT be monitored by the metadata thread thus having the guarantee that | |
948 | * the stream is still in the local stream list of the channel. This call | |
949 | * will make sure to clean that list. | |
950 | */ | |
f5a0c9cf | 951 | consumer_stream_destroy(metadata->metadata_stream, NULL); |
212d67a2 DG |
952 | cds_list_del(&metadata->metadata_stream->send_node); |
953 | metadata->metadata_stream = NULL; | |
a8086cf4 | 954 | send_streams_error: |
f5a0c9cf | 955 | error_no_stream: |
10a50311 JD |
956 | end: |
957 | return ret; | |
958 | } | |
959 | ||
960 | /* | |
961 | * Snapshot the whole metadata. | |
d2956687 | 962 | * RCU read-side lock must be held by the caller. |
10a50311 JD |
963 | * |
964 | * Returns 0 on success, < 0 on error | |
965 | */ | |
3eb928aa MD |
966 | static int snapshot_metadata(struct lttng_consumer_channel *metadata_channel, |
967 | uint64_t key, char *path, uint64_t relayd_id, | |
d2956687 | 968 | struct lttng_consumer_local_data *ctx) |
10a50311 JD |
969 | { |
970 | int ret = 0; | |
10a50311 JD |
971 | struct lttng_consumer_stream *metadata_stream; |
972 | ||
973 | assert(path); | |
974 | assert(ctx); | |
975 | ||
976 | DBG("UST consumer snapshot metadata with key %" PRIu64 " at path %s", | |
977 | key, path); | |
978 | ||
979 | rcu_read_lock(); | |
980 | ||
10a50311 JD |
981 | assert(!metadata_channel->monitor); |
982 | ||
9ce5646a MD |
983 | health_code_update(); |
984 | ||
10a50311 JD |
985 | /* |
986 | * Ask the sessiond if we have new metadata waiting and update the | |
987 | * consumer metadata cache. | |
988 | */ | |
94d49140 | 989 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 1); |
10a50311 JD |
990 | if (ret < 0) { |
991 | goto error; | |
992 | } | |
993 | ||
9ce5646a MD |
994 | health_code_update(); |
995 | ||
10a50311 JD |
996 | /* |
997 | * The metadata stream is NOT created in no monitor mode when the channel | |
998 | * is created on a sessiond ask channel command. | |
999 | */ | |
d2956687 | 1000 | ret = create_ust_streams(metadata_channel, ctx); |
10a50311 JD |
1001 | if (ret < 0) { |
1002 | goto error; | |
1003 | } | |
1004 | ||
1005 | metadata_stream = metadata_channel->metadata_stream; | |
1006 | assert(metadata_stream); | |
1007 | ||
d2956687 | 1008 | pthread_mutex_lock(&metadata_stream->lock); |
10a50311 JD |
1009 | if (relayd_id != (uint64_t) -1ULL) { |
1010 | metadata_stream->net_seq_idx = relayd_id; | |
1011 | ret = consumer_send_relayd_stream(metadata_stream, path); | |
10a50311 | 1012 | } else { |
d2956687 JG |
1013 | ret = consumer_stream_create_output_files(metadata_stream, |
1014 | false); | |
1015 | } | |
1016 | pthread_mutex_unlock(&metadata_stream->lock); | |
1017 | if (ret < 0) { | |
1018 | goto error_stream; | |
10a50311 JD |
1019 | } |
1020 | ||
04ef1097 | 1021 | do { |
9ce5646a MD |
1022 | health_code_update(); |
1023 | ||
6f9449c2 | 1024 | ret = lttng_consumer_read_subbuffer(metadata_stream, ctx, true); |
10a50311 | 1025 | if (ret < 0) { |
94d49140 | 1026 | goto error_stream; |
10a50311 | 1027 | } |
04ef1097 | 1028 | } while (ret > 0); |
10a50311 | 1029 | |
10a50311 JD |
1030 | error_stream: |
1031 | /* | |
1032 | * Clean up the stream completly because the next snapshot will use a new | |
1033 | * metadata stream. | |
1034 | */ | |
10a50311 | 1035 | consumer_stream_destroy(metadata_stream, NULL); |
212d67a2 | 1036 | cds_list_del(&metadata_stream->send_node); |
10a50311 JD |
1037 | metadata_channel->metadata_stream = NULL; |
1038 | ||
1039 | error: | |
1040 | rcu_read_unlock(); | |
1041 | return ret; | |
1042 | } | |
1043 | ||
128708c3 JG |
1044 | static |
1045 | int get_current_subbuf_addr(struct lttng_consumer_stream *stream, | |
1046 | const char **addr) | |
1047 | { | |
1048 | int ret; | |
1049 | unsigned long mmap_offset; | |
1050 | const char *mmap_base; | |
1051 | ||
b623cb6a | 1052 | mmap_base = lttng_ust_ctl_get_mmap_base(stream->ustream); |
128708c3 JG |
1053 | if (!mmap_base) { |
1054 | ERR("Failed to get mmap base for stream `%s`", | |
1055 | stream->name); | |
1056 | ret = -EPERM; | |
1057 | goto error; | |
1058 | } | |
1059 | ||
b623cb6a | 1060 | ret = lttng_ust_ctl_get_mmap_read_offset(stream->ustream, &mmap_offset); |
128708c3 JG |
1061 | if (ret != 0) { |
1062 | ERR("Failed to get mmap offset for stream `%s`", stream->name); | |
1063 | ret = -EINVAL; | |
1064 | goto error; | |
1065 | } | |
1066 | ||
1067 | *addr = mmap_base + mmap_offset; | |
1068 | error: | |
1069 | return ret; | |
1070 | ||
1071 | } | |
1072 | ||
10a50311 JD |
1073 | /* |
1074 | * Take a snapshot of all the stream of a channel. | |
d2956687 | 1075 | * RCU read-side lock and the channel lock must be held by the caller. |
10a50311 JD |
1076 | * |
1077 | * Returns 0 on success, < 0 on error | |
1078 | */ | |
3eb928aa MD |
1079 | static int snapshot_channel(struct lttng_consumer_channel *channel, |
1080 | uint64_t key, char *path, uint64_t relayd_id, | |
e098433c JG |
1081 | uint64_t nb_packets_per_stream, |
1082 | struct lttng_consumer_local_data *ctx) | |
10a50311 JD |
1083 | { |
1084 | int ret; | |
1085 | unsigned use_relayd = 0; | |
1086 | unsigned long consumed_pos, produced_pos; | |
10a50311 JD |
1087 | struct lttng_consumer_stream *stream; |
1088 | ||
1089 | assert(path); | |
1090 | assert(ctx); | |
1091 | ||
1092 | rcu_read_lock(); | |
1093 | ||
1094 | if (relayd_id != (uint64_t) -1ULL) { | |
1095 | use_relayd = 1; | |
1096 | } | |
1097 | ||
10a50311 | 1098 | assert(!channel->monitor); |
6a00837f | 1099 | DBG("UST consumer snapshot channel %" PRIu64, key); |
10a50311 JD |
1100 | |
1101 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
1102 | health_code_update(); |
1103 | ||
10a50311 JD |
1104 | /* Lock stream because we are about to change its state. */ |
1105 | pthread_mutex_lock(&stream->lock); | |
d2956687 JG |
1106 | assert(channel->trace_chunk); |
1107 | if (!lttng_trace_chunk_get(channel->trace_chunk)) { | |
1108 | /* | |
1109 | * Can't happen barring an internal error as the channel | |
1110 | * holds a reference to the trace chunk. | |
1111 | */ | |
1112 | ERR("Failed to acquire reference to channel's trace chunk"); | |
1113 | ret = -1; | |
1114 | goto error_unlock; | |
1115 | } | |
1116 | assert(!stream->trace_chunk); | |
1117 | stream->trace_chunk = channel->trace_chunk; | |
1118 | ||
10a50311 JD |
1119 | stream->net_seq_idx = relayd_id; |
1120 | ||
1121 | if (use_relayd) { | |
1122 | ret = consumer_send_relayd_stream(stream, path); | |
1123 | if (ret < 0) { | |
1124 | goto error_unlock; | |
1125 | } | |
1126 | } else { | |
d2956687 JG |
1127 | ret = consumer_stream_create_output_files(stream, |
1128 | false); | |
10a50311 JD |
1129 | if (ret < 0) { |
1130 | goto error_unlock; | |
1131 | } | |
d2956687 JG |
1132 | DBG("UST consumer snapshot stream (%" PRIu64 ")", |
1133 | stream->key); | |
10a50311 JD |
1134 | } |
1135 | ||
d4d80f77 MD |
1136 | /* |
1137 | * If tracing is active, we want to perform a "full" buffer flush. | |
1138 | * Else, if quiescent, it has already been done by the prior stop. | |
1139 | */ | |
1140 | if (!stream->quiescent) { | |
d85707b0 MD |
1141 | ret = lttng_ust_ctl_flush_buffer(stream->ustream, 0); |
1142 | if (ret < 0) { | |
1143 | ERR("Failed to flush buffer during snapshot of channel: channel key = %" PRIu64 ", channel name = '%s'", | |
1144 | channel->key, channel->name); | |
1145 | goto error_unlock; | |
1146 | } | |
d4d80f77 | 1147 | } |
10a50311 JD |
1148 | |
1149 | ret = lttng_ustconsumer_take_snapshot(stream); | |
1150 | if (ret < 0) { | |
1151 | ERR("Taking UST snapshot"); | |
1152 | goto error_unlock; | |
1153 | } | |
1154 | ||
1155 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); | |
1156 | if (ret < 0) { | |
1157 | ERR("Produced UST snapshot position"); | |
1158 | goto error_unlock; | |
1159 | } | |
1160 | ||
1161 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
1162 | if (ret < 0) { | |
1163 | ERR("Consumerd UST snapshot position"); | |
1164 | goto error_unlock; | |
1165 | } | |
1166 | ||
5c786ded JD |
1167 | /* |
1168 | * The original value is sent back if max stream size is larger than | |
d07ceecd | 1169 | * the possible size of the snapshot. Also, we assume that the session |
5c786ded JD |
1170 | * daemon should never send a maximum stream size that is lower than |
1171 | * subbuffer size. | |
1172 | */ | |
d07ceecd MD |
1173 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
1174 | produced_pos, nb_packets_per_stream, | |
1175 | stream->max_sb_size); | |
5c786ded | 1176 | |
9377d830 | 1177 | while ((long) (consumed_pos - produced_pos) < 0) { |
10a50311 JD |
1178 | ssize_t read_len; |
1179 | unsigned long len, padded_len; | |
128708c3 | 1180 | const char *subbuf_addr; |
fd424d99 | 1181 | struct lttng_buffer_view subbuf_view; |
10a50311 | 1182 | |
9ce5646a MD |
1183 | health_code_update(); |
1184 | ||
10a50311 JD |
1185 | DBG("UST consumer taking snapshot at pos %lu", consumed_pos); |
1186 | ||
b623cb6a | 1187 | ret = lttng_ust_ctl_get_subbuf(stream->ustream, &consumed_pos); |
10a50311 JD |
1188 | if (ret < 0) { |
1189 | if (ret != -EAGAIN) { | |
b623cb6a | 1190 | PERROR("lttng_ust_ctl_get_subbuf snapshot"); |
10a50311 JD |
1191 | goto error_close_stream; |
1192 | } | |
1193 | DBG("UST consumer get subbuf failed. Skipping it."); | |
1194 | consumed_pos += stream->max_sb_size; | |
ddc93ee4 | 1195 | stream->chan->lost_packets++; |
10a50311 JD |
1196 | continue; |
1197 | } | |
1198 | ||
b623cb6a | 1199 | ret = lttng_ust_ctl_get_subbuf_size(stream->ustream, &len); |
10a50311 | 1200 | if (ret < 0) { |
b623cb6a | 1201 | ERR("Snapshot lttng_ust_ctl_get_subbuf_size"); |
10a50311 JD |
1202 | goto error_put_subbuf; |
1203 | } | |
1204 | ||
b623cb6a | 1205 | ret = lttng_ust_ctl_get_padded_subbuf_size(stream->ustream, &padded_len); |
10a50311 | 1206 | if (ret < 0) { |
b623cb6a | 1207 | ERR("Snapshot lttng_ust_ctl_get_padded_subbuf_size"); |
10a50311 JD |
1208 | goto error_put_subbuf; |
1209 | } | |
1210 | ||
128708c3 JG |
1211 | ret = get_current_subbuf_addr(stream, &subbuf_addr); |
1212 | if (ret) { | |
1213 | goto error_put_subbuf; | |
1214 | } | |
1215 | ||
fd424d99 JG |
1216 | subbuf_view = lttng_buffer_view_init( |
1217 | subbuf_addr, 0, padded_len); | |
f5ba75b4 | 1218 | read_len = lttng_consumer_on_read_subbuffer_mmap( |
6f9449c2 | 1219 | stream, &subbuf_view, padded_len - len); |
10a50311 JD |
1220 | if (use_relayd) { |
1221 | if (read_len != len) { | |
56591bac | 1222 | ret = -EPERM; |
10a50311 JD |
1223 | goto error_put_subbuf; |
1224 | } | |
1225 | } else { | |
1226 | if (read_len != padded_len) { | |
56591bac | 1227 | ret = -EPERM; |
10a50311 JD |
1228 | goto error_put_subbuf; |
1229 | } | |
1230 | } | |
1231 | ||
b623cb6a | 1232 | ret = lttng_ust_ctl_put_subbuf(stream->ustream); |
10a50311 | 1233 | if (ret < 0) { |
b623cb6a | 1234 | ERR("Snapshot lttng_ust_ctl_put_subbuf"); |
10a50311 JD |
1235 | goto error_close_stream; |
1236 | } | |
1237 | consumed_pos += stream->max_sb_size; | |
1238 | } | |
1239 | ||
1240 | /* Simply close the stream so we can use it on the next snapshot. */ | |
1241 | consumer_stream_close(stream); | |
1242 | pthread_mutex_unlock(&stream->lock); | |
1243 | } | |
1244 | ||
1245 | rcu_read_unlock(); | |
1246 | return 0; | |
1247 | ||
1248 | error_put_subbuf: | |
b623cb6a MJ |
1249 | if (lttng_ust_ctl_put_subbuf(stream->ustream) < 0) { |
1250 | ERR("Snapshot lttng_ust_ctl_put_subbuf"); | |
10a50311 JD |
1251 | } |
1252 | error_close_stream: | |
1253 | consumer_stream_close(stream); | |
1254 | error_unlock: | |
1255 | pthread_mutex_unlock(&stream->lock); | |
10a50311 | 1256 | rcu_read_unlock(); |
d88aee68 DG |
1257 | return ret; |
1258 | } | |
1259 | ||
b1316da1 JG |
1260 | static |
1261 | void metadata_stream_reset_cache_consumed_position( | |
1262 | struct lttng_consumer_stream *stream) | |
1263 | { | |
1264 | ASSERT_LOCKED(stream->lock); | |
1265 | ||
1266 | DBG("Reset metadata cache of session %" PRIu64, | |
1267 | stream->chan->session_id); | |
1268 | stream->ust_metadata_pushed = 0; | |
1269 | } | |
1270 | ||
331744e3 | 1271 | /* |
c585821b MD |
1272 | * Receive the metadata updates from the sessiond. Supports receiving |
1273 | * overlapping metadata, but is needs to always belong to a contiguous | |
1274 | * range starting from 0. | |
1275 | * Be careful about the locks held when calling this function: it needs | |
1276 | * the metadata cache flush to concurrently progress in order to | |
1277 | * complete. | |
331744e3 JD |
1278 | */ |
1279 | int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset, | |
93ec662e JD |
1280 | uint64_t len, uint64_t version, |
1281 | struct lttng_consumer_channel *channel, int timer, int wait) | |
331744e3 | 1282 | { |
0c759fc9 | 1283 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
331744e3 | 1284 | char *metadata_str; |
b1316da1 | 1285 | enum consumer_metadata_cache_write_status cache_write_status; |
331744e3 | 1286 | |
8fd623e0 | 1287 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len); |
331744e3 JD |
1288 | |
1289 | metadata_str = zmalloc(len * sizeof(char)); | |
1290 | if (!metadata_str) { | |
1291 | PERROR("zmalloc metadata string"); | |
1292 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; | |
1293 | goto end; | |
1294 | } | |
1295 | ||
9ce5646a MD |
1296 | health_code_update(); |
1297 | ||
331744e3 JD |
1298 | /* Receive metadata string. */ |
1299 | ret = lttcomm_recv_unix_sock(sock, metadata_str, len); | |
1300 | if (ret < 0) { | |
1301 | /* Session daemon is dead so return gracefully. */ | |
1302 | ret_code = ret; | |
1303 | goto end_free; | |
1304 | } | |
1305 | ||
9ce5646a MD |
1306 | health_code_update(); |
1307 | ||
331744e3 | 1308 | pthread_mutex_lock(&channel->metadata_cache->lock); |
b1316da1 | 1309 | cache_write_status = consumer_metadata_cache_write( |
a25d34bc JG |
1310 | channel->metadata_cache, offset, len, version, |
1311 | metadata_str); | |
3bdc49f3 | 1312 | pthread_mutex_unlock(&channel->metadata_cache->lock); |
b1316da1 JG |
1313 | switch (cache_write_status) { |
1314 | case CONSUMER_METADATA_CACHE_WRITE_STATUS_NO_CHANGE: | |
1315 | /* | |
1316 | * The write entirely overlapped with existing contents of the | |
1317 | * same metadata version (same content); there is nothing to do. | |
1318 | */ | |
1319 | break; | |
1320 | case CONSUMER_METADATA_CACHE_WRITE_STATUS_INVALIDATED: | |
1321 | /* | |
1322 | * The metadata cache was invalidated (previously pushed | |
1323 | * content has been overwritten). Reset the stream's consumed | |
1324 | * metadata position to ensure the metadata poll thread consumes | |
1325 | * the whole cache. | |
1326 | */ | |
1327 | pthread_mutex_lock(&channel->metadata_stream->lock); | |
1328 | metadata_stream_reset_cache_consumed_position( | |
1329 | channel->metadata_stream); | |
1330 | pthread_mutex_unlock(&channel->metadata_stream->lock); | |
1331 | /* Fall-through. */ | |
1332 | case CONSUMER_METADATA_CACHE_WRITE_STATUS_APPENDED_CONTENT: | |
1333 | /* | |
1334 | * In both cases, the metadata poll thread has new data to | |
1335 | * consume. | |
1336 | */ | |
1337 | ret = consumer_metadata_wakeup_pipe(channel); | |
1338 | if (ret) { | |
1339 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
1340 | goto end_free; | |
1341 | } | |
1342 | break; | |
1343 | case CONSUMER_METADATA_CACHE_WRITE_STATUS_ERROR: | |
331744e3 JD |
1344 | /* Unable to handle metadata. Notify session daemon. */ |
1345 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
a32bd775 DG |
1346 | /* |
1347 | * Skip metadata flush on write error since the offset and len might | |
1348 | * not have been updated which could create an infinite loop below when | |
1349 | * waiting for the metadata cache to be flushed. | |
1350 | */ | |
a32bd775 | 1351 | goto end_free; |
b1316da1 JG |
1352 | default: |
1353 | abort(); | |
331744e3 | 1354 | } |
331744e3 | 1355 | |
94d49140 JD |
1356 | if (!wait) { |
1357 | goto end_free; | |
1358 | } | |
5e41ebe1 | 1359 | while (consumer_metadata_cache_flushed(channel, offset + len, timer)) { |
331744e3 | 1360 | DBG("Waiting for metadata to be flushed"); |
9ce5646a MD |
1361 | |
1362 | health_code_update(); | |
1363 | ||
331744e3 JD |
1364 | usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME); |
1365 | } | |
1366 | ||
1367 | end_free: | |
1368 | free(metadata_str); | |
1369 | end: | |
1370 | return ret_code; | |
1371 | } | |
1372 | ||
4cbc1a04 DG |
1373 | /* |
1374 | * Receive command from session daemon and process it. | |
1375 | * | |
1376 | * Return 1 on success else a negative value or 0. | |
1377 | */ | |
3bd1e081 MD |
1378 | int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
1379 | int sock, struct pollfd *consumer_sockpoll) | |
1380 | { | |
594c7c00 | 1381 | int ret_func; |
0c759fc9 | 1382 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 | 1383 | struct lttcomm_consumer_msg msg; |
ffe60014 | 1384 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 | 1385 | |
9ce5646a MD |
1386 | health_code_update(); |
1387 | ||
594c7c00 SM |
1388 | { |
1389 | ssize_t ret_recv; | |
1390 | ||
1391 | ret_recv = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); | |
1392 | if (ret_recv != sizeof(msg)) { | |
1393 | DBG("Consumer received unexpected message size %zd (expects %zu)", | |
1394 | ret_recv, sizeof(msg)); | |
1395 | /* | |
1396 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
1397 | * since the caller handles this. | |
1398 | */ | |
1399 | if (ret_recv > 0) { | |
1400 | lttng_consumer_send_error(ctx, | |
1401 | LTTCOMM_CONSUMERD_ERROR_RECV_CMD); | |
1402 | ret_recv = -1; | |
1403 | } | |
1404 | return ret_recv; | |
489f70e9 | 1405 | } |
3bd1e081 | 1406 | } |
9ce5646a MD |
1407 | |
1408 | health_code_update(); | |
1409 | ||
84382d49 MD |
1410 | /* deprecated */ |
1411 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 1412 | |
9ce5646a MD |
1413 | health_code_update(); |
1414 | ||
3f8e211f | 1415 | /* relayd needs RCU read-side lock */ |
b0b335c8 MD |
1416 | rcu_read_lock(); |
1417 | ||
3bd1e081 | 1418 | switch (msg.cmd_type) { |
00e2e675 DG |
1419 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
1420 | { | |
f50f23d9 | 1421 | /* Session daemon status message are handled in the following call. */ |
2527bf85 | 1422 | consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
7735ef9e | 1423 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, |
d3e2ba59 JD |
1424 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
1425 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
1426 | goto end_nosignal; |
1427 | } | |
173af62f DG |
1428 | case LTTNG_CONSUMER_DESTROY_RELAYD: |
1429 | { | |
a6ba4fe1 | 1430 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
173af62f DG |
1431 | struct consumer_relayd_sock_pair *relayd; |
1432 | ||
a6ba4fe1 | 1433 | DBG("UST consumer destroying relayd %" PRIu64, index); |
173af62f DG |
1434 | |
1435 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 1436 | relayd = consumer_find_relayd(index); |
173af62f | 1437 | if (relayd == NULL) { |
3448e266 | 1438 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 1439 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
173af62f DG |
1440 | } |
1441 | ||
a6ba4fe1 DG |
1442 | /* |
1443 | * Each relayd socket pair has a refcount of stream attached to it | |
1444 | * which tells if the relayd is still active or not depending on the | |
1445 | * refcount value. | |
1446 | * | |
1447 | * This will set the destroy flag of the relayd object and destroy it | |
1448 | * if the refcount reaches zero when called. | |
1449 | * | |
1450 | * The destroy can happen either here or when a stream fd hangs up. | |
1451 | */ | |
f50f23d9 DG |
1452 | if (relayd) { |
1453 | consumer_flag_relayd_for_destroy(relayd); | |
1454 | } | |
1455 | ||
d88aee68 | 1456 | goto end_msg_sessiond; |
173af62f | 1457 | } |
3bd1e081 MD |
1458 | case LTTNG_CONSUMER_UPDATE_STREAM: |
1459 | { | |
3f8e211f | 1460 | rcu_read_unlock(); |
7ad0a0cb | 1461 | return -ENOSYS; |
3bd1e081 | 1462 | } |
6d805429 | 1463 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 1464 | { |
594c7c00 SM |
1465 | int is_data_pending; |
1466 | ssize_t ret_send; | |
6d805429 | 1467 | uint64_t id = msg.u.data_pending.session_id; |
ca22feea | 1468 | |
6d805429 | 1469 | DBG("UST consumer data pending command for id %" PRIu64, id); |
ca22feea | 1470 | |
3be74084 | 1471 | is_data_pending = consumer_data_pending(id); |
ca22feea DG |
1472 | |
1473 | /* Send back returned value to session daemon */ | |
594c7c00 | 1474 | ret_send = lttcomm_send_unix_sock(sock, &is_data_pending, |
3be74084 | 1475 | sizeof(is_data_pending)); |
594c7c00 SM |
1476 | if (ret_send < 0) { |
1477 | DBG("Error when sending the data pending ret code: %zd", | |
1478 | ret_send); | |
489f70e9 | 1479 | goto error_fatal; |
ca22feea | 1480 | } |
f50f23d9 DG |
1481 | |
1482 | /* | |
1483 | * No need to send back a status message since the data pending | |
1484 | * returned value is the response. | |
1485 | */ | |
ca22feea | 1486 | break; |
53632229 | 1487 | } |
ffe60014 DG |
1488 | case LTTNG_CONSUMER_ASK_CHANNEL_CREATION: |
1489 | { | |
594c7c00 | 1490 | int ret_ask_channel, ret_add_channel, ret_send; |
b623cb6a | 1491 | struct lttng_ust_ctl_consumer_channel_attr attr; |
d2956687 JG |
1492 | const uint64_t chunk_id = msg.u.ask_channel.chunk_id.value; |
1493 | const struct lttng_credentials buffer_credentials = { | |
ff588497 JR |
1494 | .uid = LTTNG_OPTIONAL_INIT_VALUE(msg.u.ask_channel.buffer_credentials.uid), |
1495 | .gid = LTTNG_OPTIONAL_INIT_VALUE(msg.u.ask_channel.buffer_credentials.gid), | |
d2956687 | 1496 | }; |
ffe60014 DG |
1497 | |
1498 | /* Create a plain object and reserve a channel key. */ | |
a2814ea7 JG |
1499 | channel = consumer_allocate_channel( |
1500 | msg.u.ask_channel.key, | |
1501 | msg.u.ask_channel.session_id, | |
d2956687 JG |
1502 | msg.u.ask_channel.chunk_id.is_set ? |
1503 | &chunk_id : NULL, | |
1504 | msg.u.ask_channel.pathname, | |
1505 | msg.u.ask_channel.name, | |
1506 | msg.u.ask_channel.relayd_id, | |
1624d5b7 JD |
1507 | (enum lttng_event_output) msg.u.ask_channel.output, |
1508 | msg.u.ask_channel.tracefile_size, | |
2bba9e53 | 1509 | msg.u.ask_channel.tracefile_count, |
1950109e | 1510 | msg.u.ask_channel.session_id_per_pid, |
ecc48a90 | 1511 | msg.u.ask_channel.monitor, |
d7ba1388 | 1512 | msg.u.ask_channel.live_timer_interval, |
a2814ea7 | 1513 | msg.u.ask_channel.is_live, |
3d071855 | 1514 | msg.u.ask_channel.root_shm_path, |
d7ba1388 | 1515 | msg.u.ask_channel.shm_path); |
ffe60014 DG |
1516 | if (!channel) { |
1517 | goto end_channel_error; | |
1518 | } | |
1519 | ||
d2956687 JG |
1520 | LTTNG_OPTIONAL_SET(&channel->buffer_credentials, |
1521 | buffer_credentials); | |
1522 | ||
567eb353 DG |
1523 | /* |
1524 | * Assign UST application UID to the channel. This value is ignored for | |
1525 | * per PID buffers. This is specific to UST thus setting this after the | |
1526 | * allocation. | |
1527 | */ | |
1528 | channel->ust_app_uid = msg.u.ask_channel.ust_app_uid; | |
1529 | ||
ffe60014 DG |
1530 | /* Build channel attributes from received message. */ |
1531 | attr.subbuf_size = msg.u.ask_channel.subbuf_size; | |
1532 | attr.num_subbuf = msg.u.ask_channel.num_subbuf; | |
1533 | attr.overwrite = msg.u.ask_channel.overwrite; | |
1534 | attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval; | |
1535 | attr.read_timer_interval = msg.u.ask_channel.read_timer_interval; | |
7972aab2 | 1536 | attr.chan_id = msg.u.ask_channel.chan_id; |
ffe60014 | 1537 | memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid)); |
491d1539 | 1538 | attr.blocking_timeout= msg.u.ask_channel.blocking_timeout; |
ffe60014 | 1539 | |
0c759fc9 DG |
1540 | /* Match channel buffer type to the UST abi. */ |
1541 | switch (msg.u.ask_channel.output) { | |
1542 | case LTTNG_EVENT_MMAP: | |
1543 | default: | |
fc4b93fa | 1544 | attr.output = LTTNG_UST_ABI_MMAP; |
0c759fc9 DG |
1545 | break; |
1546 | } | |
1547 | ||
ffe60014 DG |
1548 | /* Translate and save channel type. */ |
1549 | switch (msg.u.ask_channel.type) { | |
fc4b93fa | 1550 | case LTTNG_UST_ABI_CHAN_PER_CPU: |
ffe60014 | 1551 | channel->type = CONSUMER_CHANNEL_TYPE_DATA; |
fc4b93fa | 1552 | attr.type = LTTNG_UST_ABI_CHAN_PER_CPU; |
8633d6e3 MD |
1553 | /* |
1554 | * Set refcount to 1 for owner. Below, we will | |
1555 | * pass ownership to the | |
1556 | * consumer_thread_channel_poll() thread. | |
1557 | */ | |
1558 | channel->refcount = 1; | |
ffe60014 | 1559 | break; |
fc4b93fa | 1560 | case LTTNG_UST_ABI_CHAN_METADATA: |
ffe60014 | 1561 | channel->type = CONSUMER_CHANNEL_TYPE_METADATA; |
fc4b93fa | 1562 | attr.type = LTTNG_UST_ABI_CHAN_METADATA; |
ffe60014 DG |
1563 | break; |
1564 | default: | |
1565 | assert(0); | |
1566 | goto error_fatal; | |
1567 | }; | |
1568 | ||
9ce5646a MD |
1569 | health_code_update(); |
1570 | ||
594c7c00 SM |
1571 | ret_ask_channel = ask_channel(ctx, channel, &attr); |
1572 | if (ret_ask_channel < 0) { | |
ffe60014 DG |
1573 | goto end_channel_error; |
1574 | } | |
1575 | ||
fc4b93fa | 1576 | if (msg.u.ask_channel.type == LTTNG_UST_ABI_CHAN_METADATA) { |
594c7c00 SM |
1577 | int ret_allocate; |
1578 | ||
1579 | ret_allocate = consumer_metadata_cache_allocate( | |
1580 | channel); | |
1581 | if (ret_allocate < 0) { | |
fc643247 MD |
1582 | ERR("Allocating metadata cache"); |
1583 | goto end_channel_error; | |
1584 | } | |
1585 | consumer_timer_switch_start(channel, attr.switch_timer_interval); | |
1586 | attr.switch_timer_interval = 0; | |
94d49140 | 1587 | } else { |
e9404c27 JG |
1588 | int monitor_start_ret; |
1589 | ||
94d49140 JD |
1590 | consumer_timer_live_start(channel, |
1591 | msg.u.ask_channel.live_timer_interval); | |
e9404c27 JG |
1592 | monitor_start_ret = consumer_timer_monitor_start( |
1593 | channel, | |
1594 | msg.u.ask_channel.monitor_timer_interval); | |
1595 | if (monitor_start_ret < 0) { | |
1596 | ERR("Starting channel monitoring timer failed"); | |
1597 | goto end_channel_error; | |
1598 | } | |
fc643247 MD |
1599 | } |
1600 | ||
9ce5646a MD |
1601 | health_code_update(); |
1602 | ||
ffe60014 DG |
1603 | /* |
1604 | * Add the channel to the internal state AFTER all streams were created | |
1605 | * and successfully sent to session daemon. This way, all streams must | |
1606 | * be ready before this channel is visible to the threads. | |
fc643247 MD |
1607 | * If add_channel succeeds, ownership of the channel is |
1608 | * passed to consumer_thread_channel_poll(). | |
ffe60014 | 1609 | */ |
594c7c00 SM |
1610 | ret_add_channel = add_channel(channel, ctx); |
1611 | if (ret_add_channel < 0) { | |
fc4b93fa | 1612 | if (msg.u.ask_channel.type == LTTNG_UST_ABI_CHAN_METADATA) { |
ea88ca2a MD |
1613 | if (channel->switch_timer_enabled == 1) { |
1614 | consumer_timer_switch_stop(channel); | |
1615 | } | |
1616 | consumer_metadata_cache_destroy(channel); | |
1617 | } | |
d3e2ba59 JD |
1618 | if (channel->live_timer_enabled == 1) { |
1619 | consumer_timer_live_stop(channel); | |
1620 | } | |
e9404c27 JG |
1621 | if (channel->monitor_timer_enabled == 1) { |
1622 | consumer_timer_monitor_stop(channel); | |
1623 | } | |
ffe60014 DG |
1624 | goto end_channel_error; |
1625 | } | |
1626 | ||
9ce5646a MD |
1627 | health_code_update(); |
1628 | ||
ffe60014 DG |
1629 | /* |
1630 | * Channel and streams are now created. Inform the session daemon that | |
1631 | * everything went well and should wait to receive the channel and | |
1632 | * streams with ustctl API. | |
1633 | */ | |
594c7c00 SM |
1634 | ret_send = consumer_send_status_channel(sock, channel); |
1635 | if (ret_send < 0) { | |
ffe60014 | 1636 | /* |
489f70e9 | 1637 | * There is probably a problem on the socket. |
ffe60014 | 1638 | */ |
489f70e9 | 1639 | goto error_fatal; |
ffe60014 DG |
1640 | } |
1641 | ||
1642 | break; | |
1643 | } | |
1644 | case LTTNG_CONSUMER_GET_CHANNEL: | |
1645 | { | |
1646 | int ret, relayd_err = 0; | |
d88aee68 | 1647 | uint64_t key = msg.u.get_channel.key; |
594c7c00 | 1648 | struct lttng_consumer_channel *found_channel; |
ffe60014 | 1649 | |
594c7c00 SM |
1650 | found_channel = consumer_find_channel(key); |
1651 | if (!found_channel) { | |
8fd623e0 | 1652 | ERR("UST consumer get channel key %" PRIu64 " not found", key); |
e462382a | 1653 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
f3a1fc7b | 1654 | goto end_get_channel; |
ffe60014 DG |
1655 | } |
1656 | ||
9ce5646a MD |
1657 | health_code_update(); |
1658 | ||
a3a86f35 | 1659 | /* Send the channel to sessiond (and relayd, if applicable). */ |
594c7c00 SM |
1660 | ret = send_channel_to_sessiond_and_relayd( |
1661 | sock, found_channel, ctx, &relayd_err); | |
ffe60014 DG |
1662 | if (ret < 0) { |
1663 | if (relayd_err) { | |
1664 | /* | |
1665 | * We were unable to send to the relayd the stream so avoid | |
1666 | * sending back a fatal error to the thread since this is OK | |
f2a444f1 DG |
1667 | * and the consumer can continue its work. The above call |
1668 | * has sent the error status message to the sessiond. | |
ffe60014 | 1669 | */ |
f3a1fc7b | 1670 | goto end_get_channel_nosignal; |
ffe60014 DG |
1671 | } |
1672 | /* | |
1673 | * The communicaton was broken hence there is a bad state between | |
1674 | * the consumer and sessiond so stop everything. | |
1675 | */ | |
f3a1fc7b | 1676 | goto error_get_channel_fatal; |
ffe60014 DG |
1677 | } |
1678 | ||
9ce5646a MD |
1679 | health_code_update(); |
1680 | ||
10a50311 JD |
1681 | /* |
1682 | * In no monitor mode, the streams ownership is kept inside the channel | |
1683 | * so don't send them to the data thread. | |
1684 | */ | |
594c7c00 | 1685 | if (!found_channel->monitor) { |
f3a1fc7b | 1686 | goto end_get_channel; |
10a50311 JD |
1687 | } |
1688 | ||
594c7c00 | 1689 | ret = send_streams_to_thread(found_channel, ctx); |
d88aee68 DG |
1690 | if (ret < 0) { |
1691 | /* | |
1692 | * If we are unable to send the stream to the thread, there is | |
1693 | * a big problem so just stop everything. | |
1694 | */ | |
f3a1fc7b | 1695 | goto error_get_channel_fatal; |
ffe60014 | 1696 | } |
ffe60014 | 1697 | /* List MUST be empty after or else it could be reused. */ |
594c7c00 | 1698 | assert(cds_list_empty(&found_channel->streams.head)); |
f3a1fc7b | 1699 | end_get_channel: |
d88aee68 | 1700 | goto end_msg_sessiond; |
f3a1fc7b JG |
1701 | error_get_channel_fatal: |
1702 | goto error_fatal; | |
1703 | end_get_channel_nosignal: | |
1704 | goto end_nosignal; | |
d88aee68 DG |
1705 | } |
1706 | case LTTNG_CONSUMER_DESTROY_CHANNEL: | |
1707 | { | |
1708 | uint64_t key = msg.u.destroy_channel.key; | |
d88aee68 | 1709 | |
a0cbdd2e MD |
1710 | /* |
1711 | * Only called if streams have not been sent to stream | |
1712 | * manager thread. However, channel has been sent to | |
1713 | * channel manager thread. | |
1714 | */ | |
1715 | notify_thread_del_channel(ctx, key); | |
d88aee68 | 1716 | goto end_msg_sessiond; |
ffe60014 | 1717 | } |
d88aee68 DG |
1718 | case LTTNG_CONSUMER_CLOSE_METADATA: |
1719 | { | |
1720 | int ret; | |
1721 | ||
1722 | ret = close_metadata(msg.u.close_metadata.key); | |
1723 | if (ret != 0) { | |
1724 | ret_code = ret; | |
1725 | } | |
1726 | ||
1727 | goto end_msg_sessiond; | |
1728 | } | |
7972aab2 DG |
1729 | case LTTNG_CONSUMER_FLUSH_CHANNEL: |
1730 | { | |
1731 | int ret; | |
1732 | ||
1733 | ret = flush_channel(msg.u.flush_channel.key); | |
1734 | if (ret != 0) { | |
1735 | ret_code = ret; | |
1736 | } | |
1737 | ||
1738 | goto end_msg_sessiond; | |
1739 | } | |
0dd01979 MD |
1740 | case LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL: |
1741 | { | |
1742 | int ret; | |
1743 | ||
1744 | ret = clear_quiescent_channel( | |
1745 | msg.u.clear_quiescent_channel.key); | |
1746 | if (ret != 0) { | |
1747 | ret_code = ret; | |
1748 | } | |
1749 | ||
1750 | goto end_msg_sessiond; | |
1751 | } | |
d88aee68 | 1752 | case LTTNG_CONSUMER_PUSH_METADATA: |
ffe60014 DG |
1753 | { |
1754 | int ret; | |
d88aee68 | 1755 | uint64_t len = msg.u.push_metadata.len; |
d88aee68 | 1756 | uint64_t key = msg.u.push_metadata.key; |
331744e3 | 1757 | uint64_t offset = msg.u.push_metadata.target_offset; |
93ec662e | 1758 | uint64_t version = msg.u.push_metadata.version; |
594c7c00 | 1759 | struct lttng_consumer_channel *found_channel; |
ffe60014 | 1760 | |
8fd623e0 DG |
1761 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, |
1762 | len); | |
ffe60014 | 1763 | |
594c7c00 SM |
1764 | found_channel = consumer_find_channel(key); |
1765 | if (!found_channel) { | |
000baf6a DG |
1766 | /* |
1767 | * This is possible if the metadata creation on the consumer side | |
1768 | * is in flight vis-a-vis a concurrent push metadata from the | |
1769 | * session daemon. Simply return that the channel failed and the | |
1770 | * session daemon will handle that message correctly considering | |
1771 | * that this race is acceptable thus the DBG() statement here. | |
1772 | */ | |
1773 | DBG("UST consumer push metadata %" PRIu64 " not found", key); | |
1774 | ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; | |
a8ffe244 | 1775 | goto end_push_metadata_msg_sessiond; |
d88aee68 DG |
1776 | } |
1777 | ||
9ce5646a MD |
1778 | health_code_update(); |
1779 | ||
c585821b MD |
1780 | if (!len) { |
1781 | /* | |
1782 | * There is nothing to receive. We have simply | |
1783 | * checked whether the channel can be found. | |
1784 | */ | |
1785 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
a8ffe244 | 1786 | goto end_push_metadata_msg_sessiond; |
c585821b MD |
1787 | } |
1788 | ||
d88aee68 | 1789 | /* Tell session daemon we are ready to receive the metadata. */ |
0c759fc9 | 1790 | ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS); |
ffe60014 DG |
1791 | if (ret < 0) { |
1792 | /* Somehow, the session daemon is not responding anymore. */ | |
a8ffe244 | 1793 | goto error_push_metadata_fatal; |
d88aee68 DG |
1794 | } |
1795 | ||
9ce5646a MD |
1796 | health_code_update(); |
1797 | ||
d88aee68 | 1798 | /* Wait for more data. */ |
9ce5646a MD |
1799 | health_poll_entry(); |
1800 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
1801 | health_poll_exit(); | |
84382d49 | 1802 | if (ret) { |
a8ffe244 | 1803 | goto error_push_metadata_fatal; |
d88aee68 DG |
1804 | } |
1805 | ||
9ce5646a MD |
1806 | health_code_update(); |
1807 | ||
594c7c00 SM |
1808 | ret = lttng_ustconsumer_recv_metadata(sock, key, offset, len, |
1809 | version, found_channel, 0, 1); | |
d88aee68 | 1810 | if (ret < 0) { |
331744e3 | 1811 | /* error receiving from sessiond */ |
a8ffe244 | 1812 | goto error_push_metadata_fatal; |
331744e3 JD |
1813 | } else { |
1814 | ret_code = ret; | |
a8ffe244 | 1815 | goto end_push_metadata_msg_sessiond; |
d88aee68 | 1816 | } |
a8ffe244 JG |
1817 | end_push_metadata_msg_sessiond: |
1818 | goto end_msg_sessiond; | |
1819 | error_push_metadata_fatal: | |
1820 | goto error_fatal; | |
d88aee68 DG |
1821 | } |
1822 | case LTTNG_CONSUMER_SETUP_METADATA: | |
1823 | { | |
1824 | int ret; | |
1825 | ||
1826 | ret = setup_metadata(ctx, msg.u.setup_metadata.key); | |
1827 | if (ret) { | |
1828 | ret_code = ret; | |
1829 | } | |
1830 | goto end_msg_sessiond; | |
ffe60014 | 1831 | } |
6dc3064a DG |
1832 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
1833 | { | |
594c7c00 | 1834 | struct lttng_consumer_channel *found_channel; |
3eb928aa | 1835 | uint64_t key = msg.u.snapshot_channel.key; |
594c7c00 | 1836 | int ret_send; |
3eb928aa | 1837 | |
594c7c00 SM |
1838 | found_channel = consumer_find_channel(key); |
1839 | if (!found_channel) { | |
3eb928aa MD |
1840 | DBG("UST snapshot channel not found for key %" PRIu64, key); |
1841 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
10a50311 | 1842 | } else { |
3eb928aa | 1843 | if (msg.u.snapshot_channel.metadata) { |
594c7c00 SM |
1844 | int ret_snapshot; |
1845 | ||
1846 | ret_snapshot = snapshot_metadata(found_channel, | |
1847 | key, | |
3eb928aa MD |
1848 | msg.u.snapshot_channel.pathname, |
1849 | msg.u.snapshot_channel.relayd_id, | |
d2956687 | 1850 | ctx); |
594c7c00 | 1851 | if (ret_snapshot < 0) { |
3eb928aa MD |
1852 | ERR("Snapshot metadata failed"); |
1853 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
1854 | } | |
1855 | } else { | |
594c7c00 SM |
1856 | int ret_snapshot; |
1857 | ||
1858 | ret_snapshot = snapshot_channel(found_channel, | |
1859 | key, | |
3eb928aa MD |
1860 | msg.u.snapshot_channel.pathname, |
1861 | msg.u.snapshot_channel.relayd_id, | |
594c7c00 SM |
1862 | msg.u.snapshot_channel |
1863 | .nb_packets_per_stream, | |
3eb928aa | 1864 | ctx); |
594c7c00 | 1865 | if (ret_snapshot < 0) { |
3eb928aa MD |
1866 | ERR("Snapshot channel failed"); |
1867 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
1868 | } | |
10a50311 JD |
1869 | } |
1870 | } | |
9ce5646a | 1871 | health_code_update(); |
594c7c00 SM |
1872 | ret_send = consumer_send_status_msg(sock, ret_code); |
1873 | if (ret_send < 0) { | |
6dc3064a DG |
1874 | /* Somehow, the session daemon is not responding anymore. */ |
1875 | goto end_nosignal; | |
1876 | } | |
9ce5646a | 1877 | health_code_update(); |
6dc3064a DG |
1878 | break; |
1879 | } | |
fb83fe64 JD |
1880 | case LTTNG_CONSUMER_DISCARDED_EVENTS: |
1881 | { | |
beb59458 MJ |
1882 | int ret = 0; |
1883 | uint64_t discarded_events; | |
fb83fe64 JD |
1884 | struct lttng_ht_iter iter; |
1885 | struct lttng_ht *ht; | |
1886 | struct lttng_consumer_stream *stream; | |
1887 | uint64_t id = msg.u.discarded_events.session_id; | |
1888 | uint64_t key = msg.u.discarded_events.channel_key; | |
1889 | ||
1890 | DBG("UST consumer discarded events command for session id %" | |
1891 | PRIu64, id); | |
1892 | rcu_read_lock(); | |
fa29bfbf | 1893 | pthread_mutex_lock(&the_consumer_data.lock); |
fb83fe64 | 1894 | |
fa29bfbf | 1895 | ht = the_consumer_data.stream_list_ht; |
fb83fe64 JD |
1896 | |
1897 | /* | |
1898 | * We only need a reference to the channel, but they are not | |
1899 | * directly indexed, so we just use the first matching stream | |
1900 | * to extract the information we need, we default to 0 if not | |
1901 | * found (no events are dropped if the channel is not yet in | |
1902 | * use). | |
1903 | */ | |
beb59458 | 1904 | discarded_events = 0; |
fb83fe64 JD |
1905 | cds_lfht_for_each_entry_duplicate(ht->ht, |
1906 | ht->hash_fct(&id, lttng_ht_seed), | |
1907 | ht->match_fct, &id, | |
1908 | &iter.iter, stream, node_session_id.node) { | |
1909 | if (stream->chan->key == key) { | |
beb59458 | 1910 | discarded_events = stream->chan->discarded_events; |
fb83fe64 JD |
1911 | break; |
1912 | } | |
1913 | } | |
fa29bfbf | 1914 | pthread_mutex_unlock(&the_consumer_data.lock); |
fb83fe64 JD |
1915 | rcu_read_unlock(); |
1916 | ||
1917 | DBG("UST consumer discarded events command for session id %" | |
1918 | PRIu64 ", channel key %" PRIu64, id, key); | |
1919 | ||
1920 | health_code_update(); | |
1921 | ||
1922 | /* Send back returned value to session daemon */ | |
beb59458 | 1923 | ret = lttcomm_send_unix_sock(sock, &discarded_events, sizeof(discarded_events)); |
fb83fe64 JD |
1924 | if (ret < 0) { |
1925 | PERROR("send discarded events"); | |
1926 | goto error_fatal; | |
1927 | } | |
1928 | ||
1929 | break; | |
1930 | } | |
1931 | case LTTNG_CONSUMER_LOST_PACKETS: | |
1932 | { | |
9a06e8d4 JG |
1933 | int ret; |
1934 | uint64_t lost_packets; | |
fb83fe64 JD |
1935 | struct lttng_ht_iter iter; |
1936 | struct lttng_ht *ht; | |
1937 | struct lttng_consumer_stream *stream; | |
1938 | uint64_t id = msg.u.lost_packets.session_id; | |
1939 | uint64_t key = msg.u.lost_packets.channel_key; | |
1940 | ||
1941 | DBG("UST consumer lost packets command for session id %" | |
1942 | PRIu64, id); | |
1943 | rcu_read_lock(); | |
fa29bfbf | 1944 | pthread_mutex_lock(&the_consumer_data.lock); |
fb83fe64 | 1945 | |
fa29bfbf | 1946 | ht = the_consumer_data.stream_list_ht; |
fb83fe64 JD |
1947 | |
1948 | /* | |
1949 | * We only need a reference to the channel, but they are not | |
1950 | * directly indexed, so we just use the first matching stream | |
1951 | * to extract the information we need, we default to 0 if not | |
1952 | * found (no packets lost if the channel is not yet in use). | |
1953 | */ | |
9a06e8d4 | 1954 | lost_packets = 0; |
fb83fe64 JD |
1955 | cds_lfht_for_each_entry_duplicate(ht->ht, |
1956 | ht->hash_fct(&id, lttng_ht_seed), | |
1957 | ht->match_fct, &id, | |
1958 | &iter.iter, stream, node_session_id.node) { | |
1959 | if (stream->chan->key == key) { | |
9a06e8d4 | 1960 | lost_packets = stream->chan->lost_packets; |
fb83fe64 JD |
1961 | break; |
1962 | } | |
1963 | } | |
fa29bfbf | 1964 | pthread_mutex_unlock(&the_consumer_data.lock); |
fb83fe64 JD |
1965 | rcu_read_unlock(); |
1966 | ||
1967 | DBG("UST consumer lost packets command for session id %" | |
1968 | PRIu64 ", channel key %" PRIu64, id, key); | |
1969 | ||
1970 | health_code_update(); | |
1971 | ||
1972 | /* Send back returned value to session daemon */ | |
9a06e8d4 JG |
1973 | ret = lttcomm_send_unix_sock(sock, &lost_packets, |
1974 | sizeof(lost_packets)); | |
fb83fe64 JD |
1975 | if (ret < 0) { |
1976 | PERROR("send lost packets"); | |
1977 | goto error_fatal; | |
1978 | } | |
1979 | ||
1980 | break; | |
1981 | } | |
b3530820 JG |
1982 | case LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE: |
1983 | { | |
594c7c00 SM |
1984 | int channel_monitor_pipe, ret_send, |
1985 | ret_set_channel_monitor_pipe; | |
1986 | ssize_t ret_recv; | |
b3530820 JG |
1987 | |
1988 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1989 | /* Successfully received the command's type. */ | |
594c7c00 SM |
1990 | ret_send = consumer_send_status_msg(sock, ret_code); |
1991 | if (ret_send < 0) { | |
b3530820 JG |
1992 | goto error_fatal; |
1993 | } | |
1994 | ||
594c7c00 SM |
1995 | ret_recv = lttcomm_recv_fds_unix_sock( |
1996 | sock, &channel_monitor_pipe, 1); | |
1997 | if (ret_recv != sizeof(channel_monitor_pipe)) { | |
b3530820 JG |
1998 | ERR("Failed to receive channel monitor pipe"); |
1999 | goto error_fatal; | |
2000 | } | |
2001 | ||
2002 | DBG("Received channel monitor pipe (%d)", channel_monitor_pipe); | |
594c7c00 SM |
2003 | ret_set_channel_monitor_pipe = |
2004 | consumer_timer_thread_set_channel_monitor_pipe( | |
2005 | channel_monitor_pipe); | |
2006 | if (!ret_set_channel_monitor_pipe) { | |
b3530820 | 2007 | int flags; |
594c7c00 | 2008 | int ret_fcntl; |
b3530820 JG |
2009 | |
2010 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
2011 | /* Set the pipe as non-blocking. */ | |
594c7c00 SM |
2012 | ret_fcntl = fcntl(channel_monitor_pipe, F_GETFL, 0); |
2013 | if (ret_fcntl == -1) { | |
b3530820 JG |
2014 | PERROR("fcntl get flags of the channel monitoring pipe"); |
2015 | goto error_fatal; | |
2016 | } | |
594c7c00 | 2017 | flags = ret_fcntl; |
b3530820 | 2018 | |
594c7c00 | 2019 | ret_fcntl = fcntl(channel_monitor_pipe, F_SETFL, |
b3530820 | 2020 | flags | O_NONBLOCK); |
594c7c00 | 2021 | if (ret_fcntl == -1) { |
b3530820 JG |
2022 | PERROR("fcntl set O_NONBLOCK flag of the channel monitoring pipe"); |
2023 | goto error_fatal; | |
2024 | } | |
2025 | DBG("Channel monitor pipe set as non-blocking"); | |
2026 | } else { | |
2027 | ret_code = LTTCOMM_CONSUMERD_ALREADY_SET; | |
2028 | } | |
2029 | goto end_msg_sessiond; | |
2030 | } | |
b99a8d42 JD |
2031 | case LTTNG_CONSUMER_ROTATE_CHANNEL: |
2032 | { | |
594c7c00 | 2033 | struct lttng_consumer_channel *found_channel; |
92b7a7f8 | 2034 | uint64_t key = msg.u.rotate_channel.key; |
594c7c00 | 2035 | int ret_send_status; |
b99a8d42 | 2036 | |
594c7c00 SM |
2037 | found_channel = consumer_find_channel(key); |
2038 | if (!found_channel) { | |
92b7a7f8 MD |
2039 | DBG("Channel %" PRIu64 " not found", key); |
2040 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
2041 | } else { | |
594c7c00 SM |
2042 | int rotate_channel; |
2043 | ||
92b7a7f8 MD |
2044 | /* |
2045 | * Sample the rotate position of all the streams in | |
2046 | * this channel. | |
2047 | */ | |
594c7c00 SM |
2048 | rotate_channel = lttng_consumer_rotate_channel( |
2049 | found_channel, key, | |
92b7a7f8 | 2050 | msg.u.rotate_channel.relayd_id, |
594c7c00 SM |
2051 | msg.u.rotate_channel.metadata, ctx); |
2052 | if (rotate_channel < 0) { | |
92b7a7f8 MD |
2053 | ERR("Rotate channel failed"); |
2054 | ret_code = LTTCOMM_CONSUMERD_ROTATION_FAIL; | |
2055 | } | |
b99a8d42 | 2056 | |
92b7a7f8 MD |
2057 | health_code_update(); |
2058 | } | |
594c7c00 SM |
2059 | |
2060 | ret_send_status = consumer_send_status_msg(sock, ret_code); | |
2061 | if (ret_send_status < 0) { | |
b99a8d42 | 2062 | /* Somehow, the session daemon is not responding anymore. */ |
41c7a76d | 2063 | goto end_rotate_channel_nosignal; |
b99a8d42 JD |
2064 | } |
2065 | ||
2066 | /* | |
2067 | * Rotate the streams that are ready right now. | |
2068 | * FIXME: this is a second consecutive iteration over the | |
2069 | * streams in a channel, there is probably a better way to | |
2070 | * handle this, but it needs to be after the | |
2071 | * consumer_send_status_msg() call. | |
2072 | */ | |
594c7c00 SM |
2073 | if (found_channel) { |
2074 | int ret_rotate_read_streams; | |
2075 | ||
2076 | ret_rotate_read_streams = | |
2077 | lttng_consumer_rotate_ready_streams( | |
2078 | found_channel, key, | |
2079 | ctx); | |
2080 | if (ret_rotate_read_streams < 0) { | |
92b7a7f8 MD |
2081 | ERR("Rotate channel failed"); |
2082 | } | |
b99a8d42 JD |
2083 | } |
2084 | break; | |
41c7a76d JG |
2085 | end_rotate_channel_nosignal: |
2086 | goto end_nosignal; | |
b99a8d42 | 2087 | } |
5f3aff8b MD |
2088 | case LTTNG_CONSUMER_CLEAR_CHANNEL: |
2089 | { | |
594c7c00 | 2090 | struct lttng_consumer_channel *found_channel; |
5f3aff8b | 2091 | uint64_t key = msg.u.clear_channel.key; |
594c7c00 | 2092 | int ret_send_status; |
5f3aff8b | 2093 | |
594c7c00 SM |
2094 | found_channel = consumer_find_channel(key); |
2095 | if (!found_channel) { | |
5f3aff8b MD |
2096 | DBG("Channel %" PRIu64 " not found", key); |
2097 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
2098 | } else { | |
594c7c00 SM |
2099 | int ret_clear_channel; |
2100 | ||
2101 | ret_clear_channel = lttng_consumer_clear_channel( | |
2102 | found_channel); | |
2103 | if (ret_clear_channel) { | |
5f3aff8b | 2104 | ERR("Clear channel failed key %" PRIu64, key); |
594c7c00 | 2105 | ret_code = ret_clear_channel; |
5f3aff8b MD |
2106 | } |
2107 | ||
2108 | health_code_update(); | |
2109 | } | |
594c7c00 SM |
2110 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
2111 | if (ret_send_status < 0) { | |
5f3aff8b MD |
2112 | /* Somehow, the session daemon is not responding anymore. */ |
2113 | goto end_nosignal; | |
2114 | } | |
2115 | break; | |
2116 | } | |
d2956687 | 2117 | case LTTNG_CONSUMER_INIT: |
00fb02ac | 2118 | { |
594c7c00 SM |
2119 | int ret_send_status; |
2120 | ||
d2956687 JG |
2121 | ret_code = lttng_consumer_init_command(ctx, |
2122 | msg.u.init.sessiond_uuid); | |
d88744a4 | 2123 | health_code_update(); |
594c7c00 SM |
2124 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
2125 | if (ret_send_status < 0) { | |
d88744a4 JD |
2126 | /* Somehow, the session daemon is not responding anymore. */ |
2127 | goto end_nosignal; | |
2128 | } | |
2129 | break; | |
2130 | } | |
d2956687 | 2131 | case LTTNG_CONSUMER_CREATE_TRACE_CHUNK: |
d88744a4 | 2132 | { |
d2956687 | 2133 | const struct lttng_credentials credentials = { |
ff588497 JR |
2134 | .uid = LTTNG_OPTIONAL_INIT_VALUE(msg.u.create_trace_chunk.credentials.value.uid), |
2135 | .gid = LTTNG_OPTIONAL_INIT_VALUE(msg.u.create_trace_chunk.credentials.value.gid), | |
d2956687 JG |
2136 | }; |
2137 | const bool is_local_trace = | |
2138 | !msg.u.create_trace_chunk.relayd_id.is_set; | |
2139 | const uint64_t relayd_id = | |
2140 | msg.u.create_trace_chunk.relayd_id.value; | |
2141 | const char *chunk_override_name = | |
2142 | *msg.u.create_trace_chunk.override_name ? | |
2143 | msg.u.create_trace_chunk.override_name : | |
2144 | NULL; | |
cbf53d23 | 2145 | struct lttng_directory_handle *chunk_directory_handle = NULL; |
d88744a4 | 2146 | |
d2956687 JG |
2147 | /* |
2148 | * The session daemon will only provide a chunk directory file | |
2149 | * descriptor for local traces. | |
2150 | */ | |
2151 | if (is_local_trace) { | |
2152 | int chunk_dirfd; | |
594c7c00 SM |
2153 | int ret_send_status; |
2154 | ssize_t ret_recv; | |
19990ed5 | 2155 | |
d2956687 | 2156 | /* Acnowledge the reception of the command. */ |
594c7c00 SM |
2157 | ret_send_status = consumer_send_status_msg( |
2158 | sock, LTTCOMM_CONSUMERD_SUCCESS); | |
2159 | if (ret_send_status < 0) { | |
d2956687 JG |
2160 | /* Somehow, the session daemon is not responding anymore. */ |
2161 | goto end_nosignal; | |
2162 | } | |
92816cc3 | 2163 | |
5da88b0f MD |
2164 | /* |
2165 | * Receive trace chunk domain dirfd. | |
2166 | */ | |
594c7c00 SM |
2167 | ret_recv = lttcomm_recv_fds_unix_sock( |
2168 | sock, &chunk_dirfd, 1); | |
2169 | if (ret_recv != sizeof(chunk_dirfd)) { | |
5da88b0f | 2170 | ERR("Failed to receive trace chunk domain directory file descriptor"); |
d2956687 JG |
2171 | goto error_fatal; |
2172 | } | |
92816cc3 | 2173 | |
5da88b0f | 2174 | DBG("Received trace chunk domain directory fd (%d)", |
d2956687 | 2175 | chunk_dirfd); |
cbf53d23 | 2176 | chunk_directory_handle = lttng_directory_handle_create_from_dirfd( |
d2956687 | 2177 | chunk_dirfd); |
cbf53d23 | 2178 | if (!chunk_directory_handle) { |
5da88b0f | 2179 | ERR("Failed to initialize chunk domain directory handle from directory file descriptor"); |
d2956687 JG |
2180 | if (close(chunk_dirfd)) { |
2181 | PERROR("Failed to close chunk directory file descriptor"); | |
2182 | } | |
2183 | goto error_fatal; | |
2184 | } | |
92816cc3 JG |
2185 | } |
2186 | ||
d2956687 JG |
2187 | ret_code = lttng_consumer_create_trace_chunk( |
2188 | !is_local_trace ? &relayd_id : NULL, | |
2189 | msg.u.create_trace_chunk.session_id, | |
2190 | msg.u.create_trace_chunk.chunk_id, | |
e5add6d0 JG |
2191 | (time_t) msg.u.create_trace_chunk |
2192 | .creation_timestamp, | |
d2956687 | 2193 | chunk_override_name, |
e5add6d0 JG |
2194 | msg.u.create_trace_chunk.credentials.is_set ? |
2195 | &credentials : | |
2196 | NULL, | |
cbf53d23 JG |
2197 | chunk_directory_handle); |
2198 | lttng_directory_handle_put(chunk_directory_handle); | |
d2956687 | 2199 | goto end_msg_sessiond; |
00fb02ac | 2200 | } |
d2956687 | 2201 | case LTTNG_CONSUMER_CLOSE_TRACE_CHUNK: |
a1ae2ea5 | 2202 | { |
bbc4768c JG |
2203 | enum lttng_trace_chunk_command_type close_command = |
2204 | msg.u.close_trace_chunk.close_command.value; | |
d2956687 JG |
2205 | const uint64_t relayd_id = |
2206 | msg.u.close_trace_chunk.relayd_id.value; | |
ecd1a12f | 2207 | struct lttcomm_consumer_close_trace_chunk_reply reply; |
d00fb490 | 2208 | char closed_trace_chunk_path[LTTNG_PATH_MAX] = {}; |
ecd1a12f | 2209 | int ret; |
d2956687 JG |
2210 | |
2211 | ret_code = lttng_consumer_close_trace_chunk( | |
2212 | msg.u.close_trace_chunk.relayd_id.is_set ? | |
bbc4768c JG |
2213 | &relayd_id : |
2214 | NULL, | |
d2956687 JG |
2215 | msg.u.close_trace_chunk.session_id, |
2216 | msg.u.close_trace_chunk.chunk_id, | |
bbc4768c JG |
2217 | (time_t) msg.u.close_trace_chunk.close_timestamp, |
2218 | msg.u.close_trace_chunk.close_command.is_set ? | |
2219 | &close_command : | |
ecd1a12f MD |
2220 | NULL, closed_trace_chunk_path); |
2221 | reply.ret_code = ret_code; | |
2222 | reply.path_length = strlen(closed_trace_chunk_path) + 1; | |
2223 | ret = lttcomm_send_unix_sock(sock, &reply, sizeof(reply)); | |
2224 | if (ret != sizeof(reply)) { | |
2225 | goto error_fatal; | |
2226 | } | |
2227 | ret = lttcomm_send_unix_sock(sock, closed_trace_chunk_path, | |
2228 | reply.path_length); | |
2229 | if (ret != reply.path_length) { | |
2230 | goto error_fatal; | |
2231 | } | |
2232 | goto end_nosignal; | |
a1ae2ea5 | 2233 | } |
d2956687 | 2234 | case LTTNG_CONSUMER_TRACE_CHUNK_EXISTS: |
3654ed19 | 2235 | { |
d2956687 JG |
2236 | const uint64_t relayd_id = |
2237 | msg.u.trace_chunk_exists.relayd_id.value; | |
2238 | ||
2239 | ret_code = lttng_consumer_trace_chunk_exists( | |
2240 | msg.u.trace_chunk_exists.relayd_id.is_set ? | |
2241 | &relayd_id : NULL, | |
2242 | msg.u.trace_chunk_exists.session_id, | |
2243 | msg.u.trace_chunk_exists.chunk_id); | |
2244 | goto end_msg_sessiond; | |
04ed9e10 JG |
2245 | } |
2246 | case LTTNG_CONSUMER_OPEN_CHANNEL_PACKETS: | |
2247 | { | |
2248 | const uint64_t key = msg.u.open_channel_packets.key; | |
594c7c00 | 2249 | struct lttng_consumer_channel *found_channel = |
04ed9e10 JG |
2250 | consumer_find_channel(key); |
2251 | ||
594c7c00 SM |
2252 | if (found_channel) { |
2253 | pthread_mutex_lock(&found_channel->lock); | |
2254 | ret_code = lttng_consumer_open_channel_packets( | |
2255 | found_channel); | |
2256 | pthread_mutex_unlock(&found_channel->lock); | |
04ed9e10 JG |
2257 | } else { |
2258 | /* | |
2259 | * The channel could have disappeared in per-pid | |
2260 | * buffering mode. | |
2261 | */ | |
2262 | DBG("Channel %" PRIu64 " not found", key); | |
2263 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
2264 | } | |
2265 | ||
2266 | health_code_update(); | |
2267 | goto end_msg_sessiond; | |
3654ed19 | 2268 | } |
3bd1e081 MD |
2269 | default: |
2270 | break; | |
2271 | } | |
3f8e211f | 2272 | |
3bd1e081 | 2273 | end_nosignal: |
4cbc1a04 DG |
2274 | /* |
2275 | * Return 1 to indicate success since the 0 value can be a socket | |
2276 | * shutdown during the recv() or send() call. | |
2277 | */ | |
594c7c00 | 2278 | ret_func = 1; |
f3a1fc7b | 2279 | goto end; |
ffe60014 DG |
2280 | |
2281 | end_msg_sessiond: | |
2282 | /* | |
2283 | * The returned value here is not useful since either way we'll return 1 to | |
2284 | * the caller because the session daemon socket management is done | |
2285 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. | |
2286 | */ | |
594c7c00 SM |
2287 | { |
2288 | int ret_send_status; | |
2289 | ||
2290 | ret_send_status = consumer_send_status_msg(sock, ret_code); | |
2291 | if (ret_send_status < 0) { | |
2292 | goto error_fatal; | |
2293 | } | |
489f70e9 | 2294 | } |
594c7c00 SM |
2295 | |
2296 | ret_func = 1; | |
f3a1fc7b | 2297 | goto end; |
9ce5646a | 2298 | |
ffe60014 DG |
2299 | end_channel_error: |
2300 | if (channel) { | |
2301 | /* | |
2302 | * Free channel here since no one has a reference to it. We don't | |
2303 | * free after that because a stream can store this pointer. | |
2304 | */ | |
2305 | destroy_channel(channel); | |
2306 | } | |
2307 | /* We have to send a status channel message indicating an error. */ | |
594c7c00 SM |
2308 | { |
2309 | int ret_send_status; | |
2310 | ||
2311 | ret_send_status = consumer_send_status_channel(sock, NULL); | |
2312 | if (ret_send_status < 0) { | |
2313 | /* Stop everything if session daemon can not be notified. */ | |
2314 | goto error_fatal; | |
2315 | } | |
ffe60014 | 2316 | } |
594c7c00 SM |
2317 | |
2318 | ret_func = 1; | |
f3a1fc7b | 2319 | goto end; |
9ce5646a | 2320 | |
ffe60014 | 2321 | error_fatal: |
ffe60014 | 2322 | /* This will issue a consumer stop. */ |
594c7c00 | 2323 | ret_func = -1; |
f3a1fc7b JG |
2324 | goto end; |
2325 | ||
2326 | end: | |
2327 | rcu_read_unlock(); | |
2328 | health_code_update(); | |
594c7c00 | 2329 | return ret_func; |
3bd1e081 MD |
2330 | } |
2331 | ||
d85707b0 MD |
2332 | int lttng_ust_flush_buffer(struct lttng_consumer_stream *stream, |
2333 | int producer_active) | |
fc6d7a51 JD |
2334 | { |
2335 | assert(stream); | |
2336 | assert(stream->ustream); | |
2337 | ||
d85707b0 | 2338 | return lttng_ust_ctl_flush_buffer(stream->ustream, producer_active); |
fc6d7a51 JD |
2339 | } |
2340 | ||
ffe60014 | 2341 | /* |
e9404c27 | 2342 | * Take a snapshot for a specific stream. |
ffe60014 DG |
2343 | * |
2344 | * Returns 0 on success, < 0 on error | |
2345 | */ | |
2346 | int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream) | |
3bd1e081 | 2347 | { |
ffe60014 DG |
2348 | assert(stream); |
2349 | assert(stream->ustream); | |
2350 | ||
b623cb6a | 2351 | return lttng_ust_ctl_snapshot(stream->ustream); |
3bd1e081 MD |
2352 | } |
2353 | ||
e9404c27 JG |
2354 | /* |
2355 | * Sample consumed and produced positions for a specific stream. | |
2356 | * | |
2357 | * Returns 0 on success, < 0 on error. | |
2358 | */ | |
2359 | int lttng_ustconsumer_sample_snapshot_positions( | |
2360 | struct lttng_consumer_stream *stream) | |
2361 | { | |
2362 | assert(stream); | |
2363 | assert(stream->ustream); | |
2364 | ||
b623cb6a | 2365 | return lttng_ust_ctl_snapshot_sample_positions(stream->ustream); |
e9404c27 JG |
2366 | } |
2367 | ||
ffe60014 DG |
2368 | /* |
2369 | * Get the produced position | |
2370 | * | |
2371 | * Returns 0 on success, < 0 on error | |
2372 | */ | |
2373 | int lttng_ustconsumer_get_produced_snapshot( | |
2374 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
3bd1e081 | 2375 | { |
ffe60014 DG |
2376 | assert(stream); |
2377 | assert(stream->ustream); | |
2378 | assert(pos); | |
7a57cf92 | 2379 | |
b623cb6a | 2380 | return lttng_ust_ctl_snapshot_get_produced(stream->ustream, pos); |
ffe60014 | 2381 | } |
7a57cf92 | 2382 | |
10a50311 JD |
2383 | /* |
2384 | * Get the consumed position | |
2385 | * | |
2386 | * Returns 0 on success, < 0 on error | |
2387 | */ | |
2388 | int lttng_ustconsumer_get_consumed_snapshot( | |
2389 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
2390 | { | |
2391 | assert(stream); | |
2392 | assert(stream->ustream); | |
2393 | assert(pos); | |
2394 | ||
b623cb6a | 2395 | return lttng_ust_ctl_snapshot_get_consumed(stream->ustream, pos); |
10a50311 JD |
2396 | } |
2397 | ||
d85707b0 | 2398 | int lttng_ustconsumer_flush_buffer(struct lttng_consumer_stream *stream, |
84a182ce DG |
2399 | int producer) |
2400 | { | |
2401 | assert(stream); | |
2402 | assert(stream->ustream); | |
2403 | ||
d85707b0 | 2404 | return lttng_ust_ctl_flush_buffer(stream->ustream, producer); |
84a182ce DG |
2405 | } |
2406 | ||
d85707b0 | 2407 | int lttng_ustconsumer_clear_buffer(struct lttng_consumer_stream *stream) |
214f70e0 JR |
2408 | { |
2409 | assert(stream); | |
2410 | assert(stream->ustream); | |
2411 | ||
d85707b0 | 2412 | return lttng_ust_ctl_clear_buffer(stream->ustream); |
214f70e0 JR |
2413 | } |
2414 | ||
84a182ce DG |
2415 | int lttng_ustconsumer_get_current_timestamp( |
2416 | struct lttng_consumer_stream *stream, uint64_t *ts) | |
2417 | { | |
2418 | assert(stream); | |
2419 | assert(stream->ustream); | |
2420 | assert(ts); | |
2421 | ||
b623cb6a | 2422 | return lttng_ust_ctl_get_current_timestamp(stream->ustream, ts); |
84a182ce DG |
2423 | } |
2424 | ||
fb83fe64 JD |
2425 | int lttng_ustconsumer_get_sequence_number( |
2426 | struct lttng_consumer_stream *stream, uint64_t *seq) | |
2427 | { | |
2428 | assert(stream); | |
2429 | assert(stream->ustream); | |
2430 | assert(seq); | |
2431 | ||
b623cb6a | 2432 | return lttng_ust_ctl_get_sequence_number(stream->ustream, seq); |
fb83fe64 JD |
2433 | } |
2434 | ||
ffe60014 | 2435 | /* |
0dd01979 | 2436 | * Called when the stream signals the consumer that it has hung up. |
ffe60014 DG |
2437 | */ |
2438 | void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream) | |
2439 | { | |
2440 | assert(stream); | |
2441 | assert(stream->ustream); | |
2c1dd183 | 2442 | |
0dd01979 MD |
2443 | pthread_mutex_lock(&stream->lock); |
2444 | if (!stream->quiescent) { | |
d85707b0 MD |
2445 | if (lttng_ust_ctl_flush_buffer(stream->ustream, 0) < 0) { |
2446 | ERR("Failed to flush buffer on stream hang-up"); | |
2447 | } else { | |
2448 | stream->quiescent = true; | |
2449 | } | |
0dd01979 MD |
2450 | } |
2451 | pthread_mutex_unlock(&stream->lock); | |
ffe60014 DG |
2452 | stream->hangup_flush_done = 1; |
2453 | } | |
ee77a7b0 | 2454 | |
ffe60014 DG |
2455 | void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan) |
2456 | { | |
4628484a MD |
2457 | int i; |
2458 | ||
ffe60014 DG |
2459 | assert(chan); |
2460 | assert(chan->uchan); | |
d2956687 | 2461 | assert(chan->buffer_credentials.is_set); |
e316aad5 | 2462 | |
ea88ca2a MD |
2463 | if (chan->switch_timer_enabled == 1) { |
2464 | consumer_timer_switch_stop(chan); | |
2465 | } | |
4628484a MD |
2466 | for (i = 0; i < chan->nr_stream_fds; i++) { |
2467 | int ret; | |
2468 | ||
2469 | ret = close(chan->stream_fds[i]); | |
2470 | if (ret) { | |
2471 | PERROR("close"); | |
2472 | } | |
2473 | if (chan->shm_path[0]) { | |
2474 | char shm_path[PATH_MAX]; | |
2475 | ||
2476 | ret = get_stream_shm_path(shm_path, chan->shm_path, i); | |
2477 | if (ret) { | |
2478 | ERR("Cannot get stream shm path"); | |
2479 | } | |
d2956687 | 2480 | ret = run_as_unlink(shm_path, |
ff588497 JR |
2481 | lttng_credentials_get_uid(LTTNG_OPTIONAL_GET_PTR( |
2482 | chan->buffer_credentials)), | |
2483 | lttng_credentials_get_gid(LTTNG_OPTIONAL_GET_PTR( | |
2484 | chan->buffer_credentials))); | |
4628484a | 2485 | if (ret) { |
4628484a MD |
2486 | PERROR("unlink %s", shm_path); |
2487 | } | |
2488 | } | |
2489 | } | |
3bd1e081 MD |
2490 | } |
2491 | ||
b83e03c4 MD |
2492 | void lttng_ustconsumer_free_channel(struct lttng_consumer_channel *chan) |
2493 | { | |
2494 | assert(chan); | |
2495 | assert(chan->uchan); | |
d2956687 | 2496 | assert(chan->buffer_credentials.is_set); |
b83e03c4 MD |
2497 | |
2498 | consumer_metadata_cache_destroy(chan); | |
b623cb6a | 2499 | lttng_ust_ctl_destroy_channel(chan->uchan); |
ea853771 JR |
2500 | /* Try to rmdir all directories under shm_path root. */ |
2501 | if (chan->root_shm_path[0]) { | |
602766ec | 2502 | (void) run_as_rmdir_recursive(chan->root_shm_path, |
ff588497 JR |
2503 | lttng_credentials_get_uid(LTTNG_OPTIONAL_GET_PTR( |
2504 | chan->buffer_credentials)), | |
2505 | lttng_credentials_get_gid(LTTNG_OPTIONAL_GET_PTR( | |
2506 | chan->buffer_credentials)), | |
f75c5439 | 2507 | LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG); |
ea853771 | 2508 | } |
b83e03c4 MD |
2509 | free(chan->stream_fds); |
2510 | } | |
2511 | ||
3bd1e081 MD |
2512 | void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream) |
2513 | { | |
ffe60014 DG |
2514 | assert(stream); |
2515 | assert(stream->ustream); | |
d41f73b7 | 2516 | |
ea88ca2a MD |
2517 | if (stream->chan->switch_timer_enabled == 1) { |
2518 | consumer_timer_switch_stop(stream->chan); | |
2519 | } | |
b623cb6a | 2520 | lttng_ust_ctl_destroy_stream(stream->ustream); |
ffe60014 | 2521 | } |
d41f73b7 | 2522 | |
6d574024 DG |
2523 | int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream) |
2524 | { | |
2525 | assert(stream); | |
2526 | assert(stream->ustream); | |
2527 | ||
b623cb6a | 2528 | return lttng_ust_ctl_stream_get_wakeup_fd(stream->ustream); |
6d574024 DG |
2529 | } |
2530 | ||
2531 | int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream) | |
2532 | { | |
2533 | assert(stream); | |
2534 | assert(stream->ustream); | |
2535 | ||
b623cb6a | 2536 | return lttng_ust_ctl_stream_close_wakeup_fd(stream->ustream); |
6d574024 DG |
2537 | } |
2538 | ||
94d49140 JD |
2539 | /* |
2540 | * Write up to one packet from the metadata cache to the channel. | |
2541 | * | |
577eea73 JG |
2542 | * Returns the number of bytes pushed from the cache into the ring buffer, or a |
2543 | * negative value on error. | |
94d49140 JD |
2544 | */ |
2545 | static | |
2546 | int commit_one_metadata_packet(struct lttng_consumer_stream *stream) | |
2547 | { | |
2548 | ssize_t write_len; | |
2549 | int ret; | |
2550 | ||
2551 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); | |
9eac9828 JG |
2552 | if (stream->chan->metadata_cache->contents.size == |
2553 | stream->ust_metadata_pushed) { | |
55954e07 JG |
2554 | /* |
2555 | * In the context of a user space metadata channel, a | |
2556 | * change in version can be detected in two ways: | |
2557 | * 1) During the pre-consume of the `read_subbuffer` loop, | |
2558 | * 2) When populating the metadata ring buffer (i.e. here). | |
2559 | * | |
2560 | * This function is invoked when there is no metadata | |
2561 | * available in the ring-buffer. If all data was consumed | |
2562 | * up to the size of the metadata cache, there is no metadata | |
2563 | * to insert in the ring-buffer. | |
2564 | * | |
2565 | * However, the metadata version could still have changed (a | |
2566 | * regeneration without any new data will yield the same cache | |
2567 | * size). | |
2568 | * | |
2569 | * The cache's version is checked for a version change and the | |
2570 | * consumed position is reset if one occurred. | |
2571 | * | |
2572 | * This check is only necessary for the user space domain as | |
2573 | * it has to manage the cache explicitly. If this reset was not | |
2574 | * performed, no metadata would be consumed (and no reset would | |
2575 | * occur as part of the pre-consume) until the metadata size | |
2576 | * exceeded the cache size. | |
2577 | */ | |
2578 | if (stream->metadata_version != | |
2579 | stream->chan->metadata_cache->version) { | |
2580 | metadata_stream_reset_cache_consumed_position(stream); | |
2581 | consumer_stream_metadata_set_version(stream, | |
2582 | stream->chan->metadata_cache->version); | |
2583 | } else { | |
2584 | ret = 0; | |
2585 | goto end; | |
2586 | } | |
94d49140 JD |
2587 | } |
2588 | ||
b623cb6a | 2589 | write_len = lttng_ust_ctl_write_one_packet_to_channel(stream->chan->uchan, |
9eac9828 JG |
2590 | &stream->chan->metadata_cache->contents.data[stream->ust_metadata_pushed], |
2591 | stream->chan->metadata_cache->contents.size - | |
2592 | stream->ust_metadata_pushed); | |
94d49140 JD |
2593 | assert(write_len != 0); |
2594 | if (write_len < 0) { | |
2595 | ERR("Writing one metadata packet"); | |
f5ba75b4 | 2596 | ret = write_len; |
94d49140 JD |
2597 | goto end; |
2598 | } | |
2599 | stream->ust_metadata_pushed += write_len; | |
2600 | ||
9eac9828 | 2601 | assert(stream->chan->metadata_cache->contents.size >= |
94d49140 JD |
2602 | stream->ust_metadata_pushed); |
2603 | ret = write_len; | |
2604 | ||
0d88e046 JG |
2605 | /* |
2606 | * Switch packet (but don't open the next one) on every commit of | |
2607 | * a metadata packet. Since the subbuffer is fully filled (with padding, | |
2608 | * if needed), the stream is "quiescent" after this commit. | |
2609 | */ | |
d85707b0 MD |
2610 | if (lttng_ust_ctl_flush_buffer(stream->ustream, 1)) { |
2611 | ERR("Failed to flush buffer while commiting one metadata packet"); | |
2612 | ret = -EIO; | |
2613 | } else { | |
2614 | stream->quiescent = true; | |
2615 | } | |
94d49140 JD |
2616 | end: |
2617 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); | |
2618 | return ret; | |
2619 | } | |
2620 | ||
309167d2 | 2621 | |
94d49140 JD |
2622 | /* |
2623 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
2624 | * metadata thread can consumer them. | |
2625 | * | |
c585821b MD |
2626 | * Metadata stream lock is held here, but we need to release it when |
2627 | * interacting with sessiond, else we cause a deadlock with live | |
2628 | * awaiting on metadata to be pushed out. | |
94d49140 | 2629 | * |
cdb72e4e | 2630 | * The RCU read side lock must be held by the caller. |
94d49140 | 2631 | */ |
577eea73 JG |
2632 | enum sync_metadata_status lttng_ustconsumer_sync_metadata( |
2633 | struct lttng_consumer_local_data *ctx, | |
cdb72e4e | 2634 | struct lttng_consumer_stream *metadata_stream) |
94d49140 JD |
2635 | { |
2636 | int ret; | |
577eea73 | 2637 | enum sync_metadata_status status; |
cdb72e4e | 2638 | struct lttng_consumer_channel *metadata_channel; |
94d49140 JD |
2639 | |
2640 | assert(ctx); | |
cdb72e4e | 2641 | assert(metadata_stream); |
94d49140 | 2642 | |
cdb72e4e JG |
2643 | metadata_channel = metadata_stream->chan; |
2644 | pthread_mutex_unlock(&metadata_stream->lock); | |
94d49140 JD |
2645 | /* |
2646 | * Request metadata from the sessiond, but don't wait for the flush | |
2647 | * because we locked the metadata thread. | |
2648 | */ | |
cdb72e4e JG |
2649 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 0); |
2650 | pthread_mutex_lock(&metadata_stream->lock); | |
94d49140 | 2651 | if (ret < 0) { |
577eea73 | 2652 | status = SYNC_METADATA_STATUS_ERROR; |
94d49140 JD |
2653 | goto end; |
2654 | } | |
2655 | ||
cdb72e4e JG |
2656 | /* |
2657 | * The metadata stream and channel can be deleted while the | |
2658 | * metadata stream lock was released. The streamed is checked | |
2659 | * for deletion before we use it further. | |
2660 | * | |
2661 | * Note that it is safe to access a logically-deleted stream since its | |
2662 | * existence is still guaranteed by the RCU read side lock. However, | |
2663 | * it should no longer be used. The close/deletion of the metadata | |
2664 | * channel and stream already guarantees that all metadata has been | |
2665 | * consumed. Therefore, there is nothing left to do in this function. | |
2666 | */ | |
2667 | if (consumer_stream_is_deleted(metadata_stream)) { | |
2668 | DBG("Metadata stream %" PRIu64 " was deleted during the metadata synchronization", | |
2669 | metadata_stream->key); | |
577eea73 | 2670 | status = SYNC_METADATA_STATUS_NO_DATA; |
cdb72e4e JG |
2671 | goto end; |
2672 | } | |
2673 | ||
2674 | ret = commit_one_metadata_packet(metadata_stream); | |
577eea73 JG |
2675 | if (ret < 0) { |
2676 | status = SYNC_METADATA_STATUS_ERROR; | |
94d49140 JD |
2677 | goto end; |
2678 | } else if (ret > 0) { | |
577eea73 JG |
2679 | status = SYNC_METADATA_STATUS_NEW_DATA; |
2680 | } else /* ret == 0 */ { | |
2681 | status = SYNC_METADATA_STATUS_NO_DATA; | |
2682 | goto end; | |
94d49140 JD |
2683 | } |
2684 | ||
b623cb6a | 2685 | ret = lttng_ust_ctl_snapshot(metadata_stream->ustream); |
94d49140 | 2686 | if (ret < 0) { |
577eea73 JG |
2687 | ERR("Failed to take a snapshot of the metadata ring-buffer positions, ret = %d", ret); |
2688 | status = SYNC_METADATA_STATUS_ERROR; | |
94d49140 JD |
2689 | goto end; |
2690 | } | |
2691 | ||
94d49140 | 2692 | end: |
577eea73 | 2693 | return status; |
94d49140 JD |
2694 | } |
2695 | ||
02b3d176 DG |
2696 | /* |
2697 | * Return 0 on success else a negative value. | |
2698 | */ | |
2699 | static int notify_if_more_data(struct lttng_consumer_stream *stream, | |
2700 | struct lttng_consumer_local_data *ctx) | |
2701 | { | |
2702 | int ret; | |
b623cb6a | 2703 | struct lttng_ust_ctl_consumer_stream *ustream; |
02b3d176 DG |
2704 | |
2705 | assert(stream); | |
2706 | assert(ctx); | |
2707 | ||
2708 | ustream = stream->ustream; | |
2709 | ||
2710 | /* | |
2711 | * First, we are going to check if there is a new subbuffer available | |
2712 | * before reading the stream wait_fd. | |
2713 | */ | |
2714 | /* Get the next subbuffer */ | |
b623cb6a | 2715 | ret = lttng_ust_ctl_get_next_subbuf(ustream); |
02b3d176 DG |
2716 | if (ret) { |
2717 | /* No more data found, flag the stream. */ | |
2718 | stream->has_data = 0; | |
2719 | ret = 0; | |
2720 | goto end; | |
2721 | } | |
2722 | ||
b623cb6a | 2723 | ret = lttng_ust_ctl_put_subbuf(ustream); |
02b3d176 DG |
2724 | assert(!ret); |
2725 | ||
2726 | /* This stream still has data. Flag it and wake up the data thread. */ | |
2727 | stream->has_data = 1; | |
2728 | ||
2729 | if (stream->monitor && !stream->hangup_flush_done && !ctx->has_wakeup) { | |
2730 | ssize_t writelen; | |
2731 | ||
2732 | writelen = lttng_pipe_write(ctx->consumer_wakeup_pipe, "!", 1); | |
2733 | if (writelen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
2734 | ret = writelen; | |
2735 | goto end; | |
2736 | } | |
2737 | ||
2738 | /* The wake up pipe has been notified. */ | |
2739 | ctx->has_wakeup = 1; | |
2740 | } | |
2741 | ret = 0; | |
2742 | ||
2743 | end: | |
2744 | return ret; | |
2745 | } | |
2746 | ||
6f9449c2 | 2747 | static int consumer_stream_ust_on_wake_up(struct lttng_consumer_stream *stream) |
fb83fe64 | 2748 | { |
6f9449c2 | 2749 | int ret = 0; |
fb83fe64 | 2750 | |
fb83fe64 | 2751 | /* |
6f9449c2 JG |
2752 | * We can consume the 1 byte written into the wait_fd by |
2753 | * UST. Don't trigger error if we cannot read this one byte | |
2754 | * (read returns 0), or if the error is EAGAIN or EWOULDBLOCK. | |
2755 | * | |
2756 | * This is only done when the stream is monitored by a thread, | |
2757 | * before the flush is done after a hangup and if the stream | |
2758 | * is not flagged with data since there might be nothing to | |
2759 | * consume in the wait fd but still have data available | |
2760 | * flagged by the consumer wake up pipe. | |
fb83fe64 | 2761 | */ |
6f9449c2 JG |
2762 | if (stream->monitor && !stream->hangup_flush_done && !stream->has_data) { |
2763 | char dummy; | |
2764 | ssize_t readlen; | |
2765 | ||
2766 | readlen = lttng_read(stream->wait_fd, &dummy, 1); | |
2767 | if (readlen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
2768 | ret = readlen; | |
2769 | } | |
fb83fe64 | 2770 | } |
fb83fe64 | 2771 | |
6f9449c2 JG |
2772 | return ret; |
2773 | } | |
2774 | ||
2775 | static int extract_common_subbuffer_info(struct lttng_consumer_stream *stream, | |
2776 | struct stream_subbuffer *subbuf) | |
2777 | { | |
2778 | int ret; | |
2779 | ||
b623cb6a | 2780 | ret = lttng_ust_ctl_get_subbuf_size( |
6f9449c2 JG |
2781 | stream->ustream, &subbuf->info.data.subbuf_size); |
2782 | if (ret) { | |
fb83fe64 JD |
2783 | goto end; |
2784 | } | |
6f9449c2 | 2785 | |
b623cb6a | 2786 | ret = lttng_ust_ctl_get_padded_subbuf_size( |
6f9449c2 JG |
2787 | stream->ustream, &subbuf->info.data.padded_subbuf_size); |
2788 | if (ret) { | |
2789 | goto end; | |
fb83fe64 | 2790 | } |
fb83fe64 JD |
2791 | |
2792 | end: | |
2793 | return ret; | |
2794 | } | |
2795 | ||
6f9449c2 JG |
2796 | static int extract_metadata_subbuffer_info(struct lttng_consumer_stream *stream, |
2797 | struct stream_subbuffer *subbuf) | |
d41f73b7 | 2798 | { |
6f9449c2 | 2799 | int ret; |
ffe60014 | 2800 | |
6f9449c2 JG |
2801 | ret = extract_common_subbuffer_info(stream, subbuf); |
2802 | if (ret) { | |
2803 | goto end; | |
2804 | } | |
d41f73b7 | 2805 | |
55954e07 | 2806 | subbuf->info.metadata.version = stream->metadata_version; |
ffe60014 | 2807 | |
6f9449c2 JG |
2808 | end: |
2809 | return ret; | |
2810 | } | |
d41f73b7 | 2811 | |
6f9449c2 JG |
2812 | static int extract_data_subbuffer_info(struct lttng_consumer_stream *stream, |
2813 | struct stream_subbuffer *subbuf) | |
2814 | { | |
2815 | int ret; | |
c617c0c6 | 2816 | |
6f9449c2 JG |
2817 | ret = extract_common_subbuffer_info(stream, subbuf); |
2818 | if (ret) { | |
2819 | goto end; | |
02d02e31 JD |
2820 | } |
2821 | ||
b623cb6a | 2822 | ret = lttng_ust_ctl_get_packet_size( |
6f9449c2 JG |
2823 | stream->ustream, &subbuf->info.data.packet_size); |
2824 | if (ret < 0) { | |
2825 | PERROR("Failed to get sub-buffer packet size"); | |
2826 | goto end; | |
2827 | } | |
04ef1097 | 2828 | |
b623cb6a | 2829 | ret = lttng_ust_ctl_get_content_size( |
6f9449c2 JG |
2830 | stream->ustream, &subbuf->info.data.content_size); |
2831 | if (ret < 0) { | |
2832 | PERROR("Failed to get sub-buffer content size"); | |
2833 | goto end; | |
d41f73b7 | 2834 | } |
309167d2 | 2835 | |
b623cb6a | 2836 | ret = lttng_ust_ctl_get_timestamp_begin( |
6f9449c2 JG |
2837 | stream->ustream, &subbuf->info.data.timestamp_begin); |
2838 | if (ret < 0) { | |
2839 | PERROR("Failed to get sub-buffer begin timestamp"); | |
2840 | goto end; | |
2841 | } | |
fb83fe64 | 2842 | |
b623cb6a | 2843 | ret = lttng_ust_ctl_get_timestamp_end( |
6f9449c2 JG |
2844 | stream->ustream, &subbuf->info.data.timestamp_end); |
2845 | if (ret < 0) { | |
2846 | PERROR("Failed to get sub-buffer end timestamp"); | |
2847 | goto end; | |
2848 | } | |
2849 | ||
b623cb6a | 2850 | ret = lttng_ust_ctl_get_events_discarded( |
6f9449c2 JG |
2851 | stream->ustream, &subbuf->info.data.events_discarded); |
2852 | if (ret) { | |
2853 | PERROR("Failed to get sub-buffer events discarded count"); | |
2854 | goto end; | |
2855 | } | |
2856 | ||
b623cb6a | 2857 | ret = lttng_ust_ctl_get_sequence_number(stream->ustream, |
6f9449c2 JG |
2858 | &subbuf->info.data.sequence_number.value); |
2859 | if (ret) { | |
2860 | /* May not be supported by older LTTng-modules. */ | |
2861 | if (ret != -ENOTTY) { | |
2862 | PERROR("Failed to get sub-buffer sequence number"); | |
2863 | goto end; | |
fb83fe64 | 2864 | } |
1c20f0e2 | 2865 | } else { |
6f9449c2 | 2866 | subbuf->info.data.sequence_number.is_set = true; |
309167d2 JD |
2867 | } |
2868 | ||
b623cb6a | 2869 | ret = lttng_ust_ctl_get_stream_id( |
6f9449c2 JG |
2870 | stream->ustream, &subbuf->info.data.stream_id); |
2871 | if (ret < 0) { | |
2872 | PERROR("Failed to get stream id"); | |
2873 | goto end; | |
2874 | } | |
1d4dfdef | 2875 | |
b623cb6a | 2876 | ret = lttng_ust_ctl_get_instance_id(stream->ustream, |
6f9449c2 JG |
2877 | &subbuf->info.data.stream_instance_id.value); |
2878 | if (ret) { | |
2879 | /* May not be supported by older LTTng-modules. */ | |
2880 | if (ret != -ENOTTY) { | |
2881 | PERROR("Failed to get stream instance id"); | |
2882 | goto end; | |
2883 | } | |
2884 | } else { | |
2885 | subbuf->info.data.stream_instance_id.is_set = true; | |
2886 | } | |
2887 | end: | |
2888 | return ret; | |
2889 | } | |
1d4dfdef | 2890 | |
6f9449c2 JG |
2891 | static int get_next_subbuffer_common(struct lttng_consumer_stream *stream, |
2892 | struct stream_subbuffer *subbuffer) | |
2893 | { | |
2894 | int ret; | |
2895 | const char *addr; | |
1d4dfdef | 2896 | |
6f9449c2 JG |
2897 | ret = stream->read_subbuffer_ops.extract_subbuffer_info( |
2898 | stream, subbuffer); | |
2899 | if (ret) { | |
2900 | goto end; | |
2901 | } | |
02d02e31 | 2902 | |
6f9449c2 | 2903 | ret = get_current_subbuf_addr(stream, &addr); |
128708c3 | 2904 | if (ret) { |
6f9449c2 | 2905 | goto end; |
128708c3 JG |
2906 | } |
2907 | ||
6f9449c2 JG |
2908 | subbuffer->buffer.buffer = lttng_buffer_view_init( |
2909 | addr, 0, subbuffer->info.data.padded_subbuf_size); | |
2910 | assert(subbuffer->buffer.buffer.data != NULL); | |
2911 | end: | |
2912 | return ret; | |
2913 | } | |
fd424d99 | 2914 | |
823a3926 JG |
2915 | static enum get_next_subbuffer_status get_next_subbuffer( |
2916 | struct lttng_consumer_stream *stream, | |
6f9449c2 JG |
2917 | struct stream_subbuffer *subbuffer) |
2918 | { | |
2919 | int ret; | |
823a3926 | 2920 | enum get_next_subbuffer_status status; |
331744e3 | 2921 | |
b623cb6a | 2922 | ret = lttng_ust_ctl_get_next_subbuf(stream->ustream); |
823a3926 JG |
2923 | switch (ret) { |
2924 | case 0: | |
2925 | status = GET_NEXT_SUBBUFFER_STATUS_OK; | |
2926 | break; | |
2927 | case -ENODATA: | |
2928 | case -EAGAIN: | |
2929 | /* | |
2930 | * The caller only expects -ENODATA when there is no data to | |
2931 | * read, but the kernel tracer returns -EAGAIN when there is | |
2932 | * currently no data for a non-finalized stream, and -ENODATA | |
2933 | * when there is no data for a finalized stream. Those can be | |
2934 | * combined into a -ENODATA return value. | |
2935 | */ | |
2936 | status = GET_NEXT_SUBBUFFER_STATUS_NO_DATA; | |
2937 | goto end; | |
2938 | default: | |
2939 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; | |
6f9449c2 | 2940 | goto end; |
02b3d176 DG |
2941 | } |
2942 | ||
6f9449c2 JG |
2943 | ret = get_next_subbuffer_common(stream, subbuffer); |
2944 | if (ret) { | |
823a3926 | 2945 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; |
23d56598 | 2946 | goto end; |
1c20f0e2 | 2947 | } |
6f9449c2 | 2948 | end: |
823a3926 | 2949 | return status; |
6f9449c2 | 2950 | } |
1c20f0e2 | 2951 | |
823a3926 JG |
2952 | static enum get_next_subbuffer_status get_next_subbuffer_metadata( |
2953 | struct lttng_consumer_stream *stream, | |
6f9449c2 JG |
2954 | struct stream_subbuffer *subbuffer) |
2955 | { | |
2956 | int ret; | |
f5ba75b4 JG |
2957 | bool cache_empty; |
2958 | bool got_subbuffer; | |
2959 | bool coherent; | |
2960 | bool buffer_empty; | |
2961 | unsigned long consumed_pos, produced_pos; | |
823a3926 | 2962 | enum get_next_subbuffer_status status; |
6f9449c2 | 2963 | |
f5ba75b4 | 2964 | do { |
b623cb6a | 2965 | ret = lttng_ust_ctl_get_next_subbuf(stream->ustream); |
f5ba75b4 JG |
2966 | if (ret == 0) { |
2967 | got_subbuffer = true; | |
2968 | } else { | |
2969 | got_subbuffer = false; | |
2970 | if (ret != -EAGAIN) { | |
2971 | /* Fatal error. */ | |
823a3926 | 2972 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; |
f5ba75b4 JG |
2973 | goto end; |
2974 | } | |
c585821b MD |
2975 | } |
2976 | ||
f5ba75b4 JG |
2977 | /* |
2978 | * Determine if the cache is empty and ensure that a sub-buffer | |
2979 | * is made available if the cache is not empty. | |
2980 | */ | |
2981 | if (!got_subbuffer) { | |
2982 | ret = commit_one_metadata_packet(stream); | |
2983 | if (ret < 0 && ret != -ENOBUFS) { | |
823a3926 | 2984 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; |
f5ba75b4 JG |
2985 | goto end; |
2986 | } else if (ret == 0) { | |
2987 | /* Not an error, the cache is empty. */ | |
2988 | cache_empty = true; | |
823a3926 | 2989 | status = GET_NEXT_SUBBUFFER_STATUS_NO_DATA; |
f5ba75b4 JG |
2990 | goto end; |
2991 | } else { | |
2992 | cache_empty = false; | |
2993 | } | |
2994 | } else { | |
2995 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); | |
9eac9828 JG |
2996 | cache_empty = stream->chan->metadata_cache->contents.size == |
2997 | stream->ust_metadata_pushed; | |
f5ba75b4 | 2998 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); |
94d49140 | 2999 | } |
f5ba75b4 | 3000 | } while (!got_subbuffer); |
94d49140 | 3001 | |
f5ba75b4 | 3002 | /* Populate sub-buffer infos and view. */ |
6f9449c2 JG |
3003 | ret = get_next_subbuffer_common(stream, subbuffer); |
3004 | if (ret) { | |
823a3926 | 3005 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; |
6f9449c2 | 3006 | goto end; |
309167d2 | 3007 | } |
f5ba75b4 JG |
3008 | |
3009 | ret = lttng_ustconsumer_sample_snapshot_positions(stream); | |
3010 | if (ret < 0) { | |
3011 | /* | |
3012 | * -EAGAIN is not expected since we got a sub-buffer and haven't | |
3013 | * pushed the consumption position yet (on put_next). | |
3014 | */ | |
3015 | PERROR("Failed to take a snapshot of metadata buffer positions"); | |
823a3926 | 3016 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; |
f5ba75b4 JG |
3017 | goto end; |
3018 | } | |
3019 | ||
3020 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
3021 | if (ret) { | |
3022 | PERROR("Failed to get metadata consumed position"); | |
823a3926 | 3023 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; |
f5ba75b4 JG |
3024 | goto end; |
3025 | } | |
3026 | ||
3027 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); | |
3028 | if (ret) { | |
3029 | PERROR("Failed to get metadata produced position"); | |
823a3926 | 3030 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; |
f5ba75b4 JG |
3031 | goto end; |
3032 | } | |
3033 | ||
3034 | /* Last sub-buffer of the ring buffer ? */ | |
3035 | buffer_empty = (consumed_pos + stream->max_sb_size) == produced_pos; | |
3036 | ||
3037 | /* | |
3038 | * The sessiond registry lock ensures that coherent units of metadata | |
3039 | * are pushed to the consumer daemon at once. Hence, if a sub-buffer is | |
3040 | * acquired, the cache is empty, and it is the only available sub-buffer | |
3041 | * available, it is safe to assume that it is "coherent". | |
3042 | */ | |
3043 | coherent = got_subbuffer && cache_empty && buffer_empty; | |
3044 | ||
3045 | LTTNG_OPTIONAL_SET(&subbuffer->info.metadata.coherent, coherent); | |
823a3926 | 3046 | status = GET_NEXT_SUBBUFFER_STATUS_OK; |
23d56598 | 3047 | end: |
823a3926 | 3048 | return status; |
d41f73b7 MD |
3049 | } |
3050 | ||
6f9449c2 JG |
3051 | static int put_next_subbuffer(struct lttng_consumer_stream *stream, |
3052 | struct stream_subbuffer *subbuffer) | |
3053 | { | |
b623cb6a | 3054 | const int ret = lttng_ust_ctl_put_next_subbuf(stream->ustream); |
6f9449c2 JG |
3055 | |
3056 | assert(ret == 0); | |
3057 | return ret; | |
3058 | } | |
3059 | ||
3060 | static int signal_metadata(struct lttng_consumer_stream *stream, | |
3061 | struct lttng_consumer_local_data *ctx) | |
3062 | { | |
8db3acaf | 3063 | ASSERT_LOCKED(stream->metadata_rdv_lock); |
6f9449c2 JG |
3064 | return pthread_cond_broadcast(&stream->metadata_rdv) ? -errno : 0; |
3065 | } | |
3066 | ||
f5ba75b4 | 3067 | static int lttng_ustconsumer_set_stream_ops( |
6f9449c2 JG |
3068 | struct lttng_consumer_stream *stream) |
3069 | { | |
f5ba75b4 JG |
3070 | int ret = 0; |
3071 | ||
6f9449c2 JG |
3072 | stream->read_subbuffer_ops.on_wake_up = consumer_stream_ust_on_wake_up; |
3073 | if (stream->metadata_flag) { | |
3074 | stream->read_subbuffer_ops.get_next_subbuffer = | |
3075 | get_next_subbuffer_metadata; | |
3076 | stream->read_subbuffer_ops.extract_subbuffer_info = | |
3077 | extract_metadata_subbuffer_info; | |
3078 | stream->read_subbuffer_ops.reset_metadata = | |
55954e07 | 3079 | metadata_stream_reset_cache_consumed_position; |
f5ba75b4 JG |
3080 | if (stream->chan->is_live) { |
3081 | stream->read_subbuffer_ops.on_sleep = signal_metadata; | |
3082 | ret = consumer_stream_enable_metadata_bucketization( | |
3083 | stream); | |
3084 | if (ret) { | |
3085 | goto end; | |
3086 | } | |
3087 | } | |
6f9449c2 JG |
3088 | } else { |
3089 | stream->read_subbuffer_ops.get_next_subbuffer = | |
3090 | get_next_subbuffer; | |
3091 | stream->read_subbuffer_ops.extract_subbuffer_info = | |
3092 | extract_data_subbuffer_info; | |
3093 | stream->read_subbuffer_ops.on_sleep = notify_if_more_data; | |
3094 | if (stream->chan->is_live) { | |
3095 | stream->read_subbuffer_ops.send_live_beacon = | |
3096 | consumer_flush_ust_index; | |
3097 | } | |
3098 | } | |
3099 | ||
3100 | stream->read_subbuffer_ops.put_next_subbuffer = put_next_subbuffer; | |
f5ba75b4 JG |
3101 | end: |
3102 | return ret; | |
6f9449c2 JG |
3103 | } |
3104 | ||
ffe60014 DG |
3105 | /* |
3106 | * Called when a stream is created. | |
fe4477ee JD |
3107 | * |
3108 | * Return 0 on success or else a negative value. | |
ffe60014 | 3109 | */ |
d41f73b7 MD |
3110 | int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream) |
3111 | { | |
fe4477ee JD |
3112 | int ret; |
3113 | ||
10a50311 JD |
3114 | assert(stream); |
3115 | ||
d2956687 JG |
3116 | /* |
3117 | * Don't create anything if this is set for streaming or if there is | |
3118 | * no current trace chunk on the parent channel. | |
3119 | */ | |
3120 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor && | |
3121 | stream->chan->trace_chunk) { | |
3122 | ret = consumer_stream_create_output_files(stream, true); | |
3123 | if (ret) { | |
fe4477ee JD |
3124 | goto error; |
3125 | } | |
fe4477ee | 3126 | } |
6f9449c2 JG |
3127 | |
3128 | lttng_ustconsumer_set_stream_ops(stream); | |
fe4477ee JD |
3129 | ret = 0; |
3130 | ||
3131 | error: | |
3132 | return ret; | |
d41f73b7 | 3133 | } |
ca22feea DG |
3134 | |
3135 | /* | |
3136 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
3137 | * stream. Consumer data lock MUST be acquired before calling this function |
3138 | * and the stream lock. | |
ca22feea | 3139 | * |
6d805429 | 3140 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
3141 | * data is available for trace viewer reading. |
3142 | */ | |
6d805429 | 3143 | int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
3144 | { |
3145 | int ret; | |
3146 | ||
3147 | assert(stream); | |
ffe60014 | 3148 | assert(stream->ustream); |
b1316da1 | 3149 | ASSERT_LOCKED(stream->lock); |
ca22feea | 3150 | |
6d805429 | 3151 | DBG("UST consumer checking data pending"); |
c8f59ee5 | 3152 | |
ca6b395f MD |
3153 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
3154 | ret = 0; | |
3155 | goto end; | |
3156 | } | |
3157 | ||
04ef1097 | 3158 | if (stream->chan->type == CONSUMER_CHANNEL_TYPE_METADATA) { |
e6ee4eab DG |
3159 | uint64_t contiguous, pushed; |
3160 | ||
3161 | /* Ease our life a bit. */ | |
934ba8fd | 3162 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); |
9eac9828 | 3163 | contiguous = stream->chan->metadata_cache->contents.size; |
934ba8fd | 3164 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); |
e6ee4eab DG |
3165 | pushed = stream->ust_metadata_pushed; |
3166 | ||
04ef1097 MD |
3167 | /* |
3168 | * We can simply check whether all contiguously available data | |
3169 | * has been pushed to the ring buffer, since the push operation | |
3170 | * is performed within get_next_subbuf(), and because both | |
3171 | * get_next_subbuf() and put_next_subbuf() are issued atomically | |
3172 | * thanks to the stream lock within | |
3173 | * lttng_ustconsumer_read_subbuffer(). This basically means that | |
3174 | * whetnever ust_metadata_pushed is incremented, the associated | |
3175 | * metadata has been consumed from the metadata stream. | |
3176 | */ | |
3177 | DBG("UST consumer metadata pending check: contiguous %" PRIu64 " vs pushed %" PRIu64, | |
e6ee4eab | 3178 | contiguous, pushed); |
aa01b94c | 3179 | assert(((int64_t) (contiguous - pushed)) >= 0); |
e6ee4eab | 3180 | if ((contiguous != pushed) || |
6acdf328 | 3181 | (((int64_t) contiguous - pushed) > 0 || contiguous == 0)) { |
04ef1097 MD |
3182 | ret = 1; /* Data is pending */ |
3183 | goto end; | |
3184 | } | |
3185 | } else { | |
b623cb6a | 3186 | ret = lttng_ust_ctl_get_next_subbuf(stream->ustream); |
04ef1097 MD |
3187 | if (ret == 0) { |
3188 | /* | |
3189 | * There is still data so let's put back this | |
3190 | * subbuffer. | |
3191 | */ | |
b623cb6a | 3192 | ret = lttng_ust_ctl_put_subbuf(stream->ustream); |
04ef1097 MD |
3193 | assert(ret == 0); |
3194 | ret = 1; /* Data is pending */ | |
3195 | goto end; | |
3196 | } | |
ca22feea DG |
3197 | } |
3198 | ||
6d805429 DG |
3199 | /* Data is NOT pending so ready to be read. */ |
3200 | ret = 0; | |
ca22feea | 3201 | |
6efae65e DG |
3202 | end: |
3203 | return ret; | |
ca22feea | 3204 | } |
d88aee68 | 3205 | |
6d574024 DG |
3206 | /* |
3207 | * Stop a given metadata channel timer if enabled and close the wait fd which | |
3208 | * is the poll pipe of the metadata stream. | |
3209 | * | |
d2c82a5a | 3210 | * This MUST be called with the metadata channel lock acquired. |
6d574024 DG |
3211 | */ |
3212 | void lttng_ustconsumer_close_metadata(struct lttng_consumer_channel *metadata) | |
3213 | { | |
3214 | int ret; | |
3215 | ||
3216 | assert(metadata); | |
3217 | assert(metadata->type == CONSUMER_CHANNEL_TYPE_METADATA); | |
3218 | ||
3219 | DBG("Closing metadata channel key %" PRIu64, metadata->key); | |
3220 | ||
3221 | if (metadata->switch_timer_enabled == 1) { | |
3222 | consumer_timer_switch_stop(metadata); | |
3223 | } | |
3224 | ||
3225 | if (!metadata->metadata_stream) { | |
3226 | goto end; | |
3227 | } | |
3228 | ||
3229 | /* | |
3230 | * Closing write side so the thread monitoring the stream wakes up if any | |
3231 | * and clean the metadata stream. | |
3232 | */ | |
3233 | if (metadata->metadata_stream->ust_metadata_poll_pipe[1] >= 0) { | |
3234 | ret = close(metadata->metadata_stream->ust_metadata_poll_pipe[1]); | |
3235 | if (ret < 0) { | |
3236 | PERROR("closing metadata pipe write side"); | |
3237 | } | |
3238 | metadata->metadata_stream->ust_metadata_poll_pipe[1] = -1; | |
3239 | } | |
3240 | ||
3241 | end: | |
3242 | return; | |
3243 | } | |
3244 | ||
d88aee68 DG |
3245 | /* |
3246 | * Close every metadata stream wait fd of the metadata hash table. This | |
3247 | * function MUST be used very carefully so not to run into a race between the | |
3248 | * metadata thread handling streams and this function closing their wait fd. | |
3249 | * | |
3250 | * For UST, this is used when the session daemon hangs up. Its the metadata | |
3251 | * producer so calling this is safe because we are assured that no state change | |
3252 | * can occur in the metadata thread for the streams in the hash table. | |
3253 | */ | |
6d574024 | 3254 | void lttng_ustconsumer_close_all_metadata(struct lttng_ht *metadata_ht) |
d88aee68 | 3255 | { |
d88aee68 DG |
3256 | struct lttng_ht_iter iter; |
3257 | struct lttng_consumer_stream *stream; | |
3258 | ||
3259 | assert(metadata_ht); | |
3260 | assert(metadata_ht->ht); | |
3261 | ||
3262 | DBG("UST consumer closing all metadata streams"); | |
3263 | ||
3264 | rcu_read_lock(); | |
3265 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, | |
3266 | node.node) { | |
9ce5646a MD |
3267 | |
3268 | health_code_update(); | |
3269 | ||
be2b50c7 | 3270 | pthread_mutex_lock(&stream->chan->lock); |
6d574024 | 3271 | lttng_ustconsumer_close_metadata(stream->chan); |
be2b50c7 DG |
3272 | pthread_mutex_unlock(&stream->chan->lock); |
3273 | ||
d88aee68 DG |
3274 | } |
3275 | rcu_read_unlock(); | |
3276 | } | |
d8ef542d MD |
3277 | |
3278 | void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream) | |
3279 | { | |
3280 | int ret; | |
3281 | ||
b623cb6a | 3282 | ret = lttng_ust_ctl_stream_close_wakeup_fd(stream->ustream); |
d8ef542d MD |
3283 | if (ret < 0) { |
3284 | ERR("Unable to close wakeup fd"); | |
3285 | } | |
3286 | } | |
331744e3 | 3287 | |
f666ae70 MD |
3288 | /* |
3289 | * Please refer to consumer-timer.c before adding any lock within this | |
3290 | * function or any of its callees. Timers have a very strict locking | |
3291 | * semantic with respect to teardown. Failure to respect this semantic | |
3292 | * introduces deadlocks. | |
c585821b MD |
3293 | * |
3294 | * DON'T hold the metadata lock when calling this function, else this | |
3295 | * can cause deadlock involving consumer awaiting for metadata to be | |
3296 | * pushed out due to concurrent interaction with the session daemon. | |
f666ae70 | 3297 | */ |
331744e3 | 3298 | int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx, |
94d49140 | 3299 | struct lttng_consumer_channel *channel, int timer, int wait) |
331744e3 JD |
3300 | { |
3301 | struct lttcomm_metadata_request_msg request; | |
3302 | struct lttcomm_consumer_msg msg; | |
0c759fc9 | 3303 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
93ec662e | 3304 | uint64_t len, key, offset, version; |
331744e3 JD |
3305 | int ret; |
3306 | ||
3307 | assert(channel); | |
3308 | assert(channel->metadata_cache); | |
3309 | ||
53efb85a MD |
3310 | memset(&request, 0, sizeof(request)); |
3311 | ||
331744e3 | 3312 | /* send the metadata request to sessiond */ |
fa29bfbf | 3313 | switch (the_consumer_data.type) { |
331744e3 JD |
3314 | case LTTNG_CONSUMER64_UST: |
3315 | request.bits_per_long = 64; | |
3316 | break; | |
3317 | case LTTNG_CONSUMER32_UST: | |
3318 | request.bits_per_long = 32; | |
3319 | break; | |
3320 | default: | |
3321 | request.bits_per_long = 0; | |
3322 | break; | |
3323 | } | |
3324 | ||
3325 | request.session_id = channel->session_id; | |
1950109e | 3326 | request.session_id_per_pid = channel->session_id_per_pid; |
567eb353 DG |
3327 | /* |
3328 | * Request the application UID here so the metadata of that application can | |
3329 | * be sent back. The channel UID corresponds to the user UID of the session | |
3330 | * used for the rights on the stream file(s). | |
3331 | */ | |
3332 | request.uid = channel->ust_app_uid; | |
331744e3 | 3333 | request.key = channel->key; |
567eb353 | 3334 | |
1950109e | 3335 | DBG("Sending metadata request to sessiond, session id %" PRIu64 |
3e25d926 | 3336 | ", per-pid %" PRIu64 ", app UID %u and channel key %" PRIu64, |
567eb353 DG |
3337 | request.session_id, request.session_id_per_pid, request.uid, |
3338 | request.key); | |
331744e3 | 3339 | |
75d83e50 | 3340 | pthread_mutex_lock(&ctx->metadata_socket_lock); |
9ce5646a MD |
3341 | |
3342 | health_code_update(); | |
3343 | ||
331744e3 JD |
3344 | ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request, |
3345 | sizeof(request)); | |
3346 | if (ret < 0) { | |
3347 | ERR("Asking metadata to sessiond"); | |
3348 | goto end; | |
3349 | } | |
3350 | ||
9ce5646a MD |
3351 | health_code_update(); |
3352 | ||
331744e3 JD |
3353 | /* Receive the metadata from sessiond */ |
3354 | ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg, | |
3355 | sizeof(msg)); | |
3356 | if (ret != sizeof(msg)) { | |
8fd623e0 | 3357 | DBG("Consumer received unexpected message size %d (expects %zu)", |
331744e3 JD |
3358 | ret, sizeof(msg)); |
3359 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); | |
3360 | /* | |
3361 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
3362 | * since the caller handles this. | |
3363 | */ | |
3364 | goto end; | |
3365 | } | |
3366 | ||
9ce5646a MD |
3367 | health_code_update(); |
3368 | ||
331744e3 JD |
3369 | if (msg.cmd_type == LTTNG_ERR_UND) { |
3370 | /* No registry found */ | |
3371 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, | |
3372 | ret_code); | |
3373 | ret = 0; | |
3374 | goto end; | |
3375 | } else if (msg.cmd_type != LTTNG_CONSUMER_PUSH_METADATA) { | |
3376 | ERR("Unexpected cmd_type received %d", msg.cmd_type); | |
3377 | ret = -1; | |
3378 | goto end; | |
3379 | } | |
3380 | ||
3381 | len = msg.u.push_metadata.len; | |
3382 | key = msg.u.push_metadata.key; | |
3383 | offset = msg.u.push_metadata.target_offset; | |
93ec662e | 3384 | version = msg.u.push_metadata.version; |
331744e3 JD |
3385 | |
3386 | assert(key == channel->key); | |
3387 | if (len == 0) { | |
3388 | DBG("No new metadata to receive for key %" PRIu64, key); | |
3389 | } | |
3390 | ||
9ce5646a MD |
3391 | health_code_update(); |
3392 | ||
331744e3 JD |
3393 | /* Tell session daemon we are ready to receive the metadata. */ |
3394 | ret = consumer_send_status_msg(ctx->consumer_metadata_socket, | |
0c759fc9 | 3395 | LTTCOMM_CONSUMERD_SUCCESS); |
331744e3 JD |
3396 | if (ret < 0 || len == 0) { |
3397 | /* | |
3398 | * Somehow, the session daemon is not responding anymore or there is | |
3399 | * nothing to receive. | |
3400 | */ | |
3401 | goto end; | |
3402 | } | |
3403 | ||
9ce5646a MD |
3404 | health_code_update(); |
3405 | ||
1eb682be | 3406 | ret = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket, |
93ec662e | 3407 | key, offset, len, version, channel, timer, wait); |
1eb682be | 3408 | if (ret >= 0) { |
f2a444f1 DG |
3409 | /* |
3410 | * Only send the status msg if the sessiond is alive meaning a positive | |
3411 | * ret code. | |
3412 | */ | |
1eb682be | 3413 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret); |
f2a444f1 | 3414 | } |
331744e3 JD |
3415 | ret = 0; |
3416 | ||
3417 | end: | |
9ce5646a MD |
3418 | health_code_update(); |
3419 | ||
75d83e50 | 3420 | pthread_mutex_unlock(&ctx->metadata_socket_lock); |
331744e3 JD |
3421 | return ret; |
3422 | } | |
70190e1c DG |
3423 | |
3424 | /* | |
3425 | * Return the ustctl call for the get stream id. | |
3426 | */ | |
3427 | int lttng_ustconsumer_get_stream_id(struct lttng_consumer_stream *stream, | |
3428 | uint64_t *stream_id) | |
3429 | { | |
3430 | assert(stream); | |
3431 | assert(stream_id); | |
3432 | ||
b623cb6a | 3433 | return lttng_ust_ctl_get_stream_id(stream->ustream, stream_id); |
70190e1c | 3434 | } |
d85707b0 MD |
3435 | |
3436 | void lttng_ustconsumer_sigbus_handle(void *addr) | |
3437 | { | |
3438 | lttng_ust_ctl_sigbus_handle(addr); | |
3439 | } |