Commit | Line | Data |
---|---|---|
3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * | |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
3bd1e081 MD |
8 | * |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
3bd1e081 MD |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <assert.h> | |
3bd1e081 MD |
21 | #include <poll.h> |
22 | #include <pthread.h> | |
23 | #include <stdlib.h> | |
24 | #include <string.h> | |
25 | #include <sys/mman.h> | |
26 | #include <sys/socket.h> | |
27 | #include <sys/types.h> | |
77c7c900 | 28 | #include <inttypes.h> |
3bd1e081 | 29 | #include <unistd.h> |
dbb5dfe6 | 30 | #include <sys/stat.h> |
3bd1e081 | 31 | |
51a9e1c7 | 32 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 33 | #include <common/common.h> |
10a8a223 | 34 | #include <common/kernel-ctl/kernel-ctl.h> |
10a8a223 | 35 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 36 | #include <common/sessiond-comm/relayd.h> |
dbb5dfe6 | 37 | #include <common/compat/fcntl.h> |
f263b7fd | 38 | #include <common/compat/endian.h> |
acdb9057 | 39 | #include <common/pipe.h> |
00e2e675 | 40 | #include <common/relayd/relayd.h> |
fe4477ee | 41 | #include <common/utils.h> |
07b86b52 | 42 | #include <common/consumer-stream.h> |
309167d2 | 43 | #include <common/index/index.h> |
d3e2ba59 | 44 | #include <common/consumer-timer.h> |
0857097f | 45 | |
10a8a223 | 46 | #include "kernel-consumer.h" |
3bd1e081 MD |
47 | |
48 | extern struct lttng_consumer_global_data consumer_data; | |
49 | extern int consumer_poll_timeout; | |
50 | extern volatile int consumer_quit; | |
51 | ||
3bd1e081 MD |
52 | /* |
53 | * Take a snapshot for a specific fd | |
54 | * | |
55 | * Returns 0 on success, < 0 on error | |
56 | */ | |
ffe60014 | 57 | int lttng_kconsumer_take_snapshot(struct lttng_consumer_stream *stream) |
3bd1e081 MD |
58 | { |
59 | int ret = 0; | |
60 | int infd = stream->wait_fd; | |
61 | ||
62 | ret = kernctl_snapshot(infd); | |
63 | if (ret != 0) { | |
5a510c9f | 64 | PERROR("Getting sub-buffer snapshot."); |
56591bac | 65 | ret = -errno; |
3bd1e081 MD |
66 | } |
67 | ||
68 | return ret; | |
69 | } | |
70 | ||
71 | /* | |
72 | * Get the produced position | |
73 | * | |
74 | * Returns 0 on success, < 0 on error | |
75 | */ | |
ffe60014 | 76 | int lttng_kconsumer_get_produced_snapshot(struct lttng_consumer_stream *stream, |
3bd1e081 MD |
77 | unsigned long *pos) |
78 | { | |
79 | int ret; | |
80 | int infd = stream->wait_fd; | |
81 | ||
82 | ret = kernctl_snapshot_get_produced(infd, pos); | |
83 | if (ret != 0) { | |
5a510c9f | 84 | PERROR("kernctl_snapshot_get_produced"); |
56591bac | 85 | ret = -errno; |
3bd1e081 MD |
86 | } |
87 | ||
88 | return ret; | |
89 | } | |
90 | ||
07b86b52 JD |
91 | /* |
92 | * Get the consumerd position | |
93 | * | |
94 | * Returns 0 on success, < 0 on error | |
95 | */ | |
96 | int lttng_kconsumer_get_consumed_snapshot(struct lttng_consumer_stream *stream, | |
97 | unsigned long *pos) | |
98 | { | |
99 | int ret; | |
100 | int infd = stream->wait_fd; | |
101 | ||
102 | ret = kernctl_snapshot_get_consumed(infd, pos); | |
103 | if (ret != 0) { | |
5a510c9f | 104 | PERROR("kernctl_snapshot_get_consumed"); |
56591bac | 105 | ret = -errno; |
07b86b52 JD |
106 | } |
107 | ||
108 | return ret; | |
109 | } | |
110 | ||
07b86b52 JD |
111 | /* |
112 | * Take a snapshot of all the stream of a channel | |
113 | * | |
114 | * Returns 0 on success, < 0 on error | |
115 | */ | |
116 | int lttng_kconsumer_snapshot_channel(uint64_t key, char *path, | |
5c786ded JD |
117 | uint64_t relayd_id, uint64_t max_stream_size, |
118 | struct lttng_consumer_local_data *ctx) | |
07b86b52 JD |
119 | { |
120 | int ret; | |
121 | unsigned long consumed_pos, produced_pos; | |
122 | struct lttng_consumer_channel *channel; | |
123 | struct lttng_consumer_stream *stream; | |
124 | ||
6a00837f | 125 | DBG("Kernel consumer snapshot channel %" PRIu64, key); |
07b86b52 JD |
126 | |
127 | rcu_read_lock(); | |
128 | ||
129 | channel = consumer_find_channel(key); | |
130 | if (!channel) { | |
6a00837f | 131 | ERR("No channel found for key %" PRIu64, key); |
07b86b52 JD |
132 | ret = -1; |
133 | goto end; | |
134 | } | |
135 | ||
136 | /* Splice is not supported yet for channel snapshot. */ | |
137 | if (channel->output != CONSUMER_CHANNEL_MMAP) { | |
138 | ERR("Unsupported output %d", channel->output); | |
139 | ret = -1; | |
140 | goto end; | |
141 | } | |
142 | ||
10a50311 | 143 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { |
9ce5646a MD |
144 | |
145 | health_code_update(); | |
146 | ||
07b86b52 JD |
147 | /* |
148 | * Lock stream because we are about to change its state. | |
149 | */ | |
150 | pthread_mutex_lock(&stream->lock); | |
151 | ||
29decac3 DG |
152 | /* |
153 | * Assign the received relayd ID so we can use it for streaming. The streams | |
154 | * are not visible to anyone so this is OK to change it. | |
155 | */ | |
07b86b52 JD |
156 | stream->net_seq_idx = relayd_id; |
157 | channel->relayd_id = relayd_id; | |
158 | if (relayd_id != (uint64_t) -1ULL) { | |
10a50311 | 159 | ret = consumer_send_relayd_stream(stream, path); |
07b86b52 JD |
160 | if (ret < 0) { |
161 | ERR("sending stream to relayd"); | |
162 | goto end_unlock; | |
163 | } | |
07b86b52 JD |
164 | } else { |
165 | ret = utils_create_stream_file(path, stream->name, | |
10a50311 JD |
166 | stream->chan->tracefile_size, |
167 | stream->tracefile_count_current, | |
309167d2 | 168 | stream->uid, stream->gid, NULL); |
07b86b52 JD |
169 | if (ret < 0) { |
170 | ERR("utils_create_stream_file"); | |
171 | goto end_unlock; | |
172 | } | |
173 | ||
174 | stream->out_fd = ret; | |
175 | stream->tracefile_size_current = 0; | |
176 | ||
81ea21bf MD |
177 | DBG("Kernel consumer snapshot stream %s/%s (%" PRIu64 ")", |
178 | path, stream->name, stream->key); | |
07b86b52 | 179 | } |
601262d6 JD |
180 | if (relayd_id != -1ULL) { |
181 | ret = consumer_send_relayd_streams_sent(relayd_id); | |
182 | if (ret < 0) { | |
183 | ERR("sending streams sent to relayd"); | |
184 | goto end_unlock; | |
185 | } | |
a4baae1b | 186 | } |
07b86b52 JD |
187 | |
188 | ret = kernctl_buffer_flush(stream->wait_fd); | |
189 | if (ret < 0) { | |
10a50311 | 190 | ERR("Failed to flush kernel stream"); |
56591bac | 191 | ret = -errno; |
07b86b52 JD |
192 | goto end_unlock; |
193 | } | |
194 | ||
195 | ret = lttng_kconsumer_take_snapshot(stream); | |
196 | if (ret < 0) { | |
197 | ERR("Taking kernel snapshot"); | |
198 | goto end_unlock; | |
199 | } | |
200 | ||
201 | ret = lttng_kconsumer_get_produced_snapshot(stream, &produced_pos); | |
202 | if (ret < 0) { | |
203 | ERR("Produced kernel snapshot position"); | |
204 | goto end_unlock; | |
205 | } | |
206 | ||
207 | ret = lttng_kconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
208 | if (ret < 0) { | |
209 | ERR("Consumerd kernel snapshot position"); | |
210 | goto end_unlock; | |
211 | } | |
212 | ||
213 | if (stream->max_sb_size == 0) { | |
214 | ret = kernctl_get_max_subbuf_size(stream->wait_fd, | |
215 | &stream->max_sb_size); | |
216 | if (ret < 0) { | |
217 | ERR("Getting kernel max_sb_size"); | |
56591bac | 218 | ret = -errno; |
07b86b52 JD |
219 | goto end_unlock; |
220 | } | |
221 | } | |
222 | ||
5c786ded JD |
223 | /* |
224 | * The original value is sent back if max stream size is larger than | |
225 | * the possible size of the snapshot. Also, we asume that the session | |
226 | * daemon should never send a maximum stream size that is lower than | |
227 | * subbuffer size. | |
228 | */ | |
229 | consumed_pos = consumer_get_consumed_maxsize(consumed_pos, | |
230 | produced_pos, max_stream_size); | |
231 | ||
07b86b52 JD |
232 | while (consumed_pos < produced_pos) { |
233 | ssize_t read_len; | |
234 | unsigned long len, padded_len; | |
235 | ||
9ce5646a MD |
236 | health_code_update(); |
237 | ||
07b86b52 JD |
238 | DBG("Kernel consumer taking snapshot at pos %lu", consumed_pos); |
239 | ||
240 | ret = kernctl_get_subbuf(stream->wait_fd, &consumed_pos); | |
241 | if (ret < 0) { | |
242 | if (errno != EAGAIN) { | |
243 | PERROR("kernctl_get_subbuf snapshot"); | |
56591bac | 244 | ret = -errno; |
07b86b52 JD |
245 | goto end_unlock; |
246 | } | |
247 | DBG("Kernel consumer get subbuf failed. Skipping it."); | |
248 | consumed_pos += stream->max_sb_size; | |
249 | continue; | |
250 | } | |
251 | ||
252 | ret = kernctl_get_subbuf_size(stream->wait_fd, &len); | |
253 | if (ret < 0) { | |
254 | ERR("Snapshot kernctl_get_subbuf_size"); | |
56591bac | 255 | ret = -errno; |
29decac3 | 256 | goto error_put_subbuf; |
07b86b52 JD |
257 | } |
258 | ||
259 | ret = kernctl_get_padded_subbuf_size(stream->wait_fd, &padded_len); | |
260 | if (ret < 0) { | |
261 | ERR("Snapshot kernctl_get_padded_subbuf_size"); | |
56591bac | 262 | ret = -errno; |
29decac3 | 263 | goto error_put_subbuf; |
07b86b52 JD |
264 | } |
265 | ||
266 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
309167d2 | 267 | padded_len - len, NULL); |
07b86b52 | 268 | /* |
29decac3 DG |
269 | * We write the padded len in local tracefiles but the data len |
270 | * when using a relay. Display the error but continue processing | |
271 | * to try to release the subbuffer. | |
07b86b52 JD |
272 | */ |
273 | if (relayd_id != (uint64_t) -1ULL) { | |
274 | if (read_len != len) { | |
275 | ERR("Error sending to the relay (ret: %zd != len: %lu)", | |
276 | read_len, len); | |
277 | } | |
278 | } else { | |
279 | if (read_len != padded_len) { | |
280 | ERR("Error writing to tracefile (ret: %zd != len: %lu)", | |
281 | read_len, padded_len); | |
282 | } | |
283 | } | |
284 | ||
285 | ret = kernctl_put_subbuf(stream->wait_fd); | |
286 | if (ret < 0) { | |
287 | ERR("Snapshot kernctl_put_subbuf"); | |
56591bac | 288 | ret = -errno; |
07b86b52 JD |
289 | goto end_unlock; |
290 | } | |
291 | consumed_pos += stream->max_sb_size; | |
292 | } | |
293 | ||
294 | if (relayd_id == (uint64_t) -1ULL) { | |
fdf9986c MD |
295 | if (stream->out_fd >= 0) { |
296 | ret = close(stream->out_fd); | |
297 | if (ret < 0) { | |
298 | PERROR("Kernel consumer snapshot close out_fd"); | |
299 | goto end_unlock; | |
300 | } | |
301 | stream->out_fd = -1; | |
07b86b52 | 302 | } |
07b86b52 JD |
303 | } else { |
304 | close_relayd_stream(stream); | |
305 | stream->net_seq_idx = (uint64_t) -1ULL; | |
306 | } | |
307 | pthread_mutex_unlock(&stream->lock); | |
308 | } | |
309 | ||
310 | /* All good! */ | |
311 | ret = 0; | |
312 | goto end; | |
313 | ||
29decac3 DG |
314 | error_put_subbuf: |
315 | ret = kernctl_put_subbuf(stream->wait_fd); | |
316 | if (ret < 0) { | |
56591bac | 317 | ret = -errno; |
29decac3 DG |
318 | ERR("Snapshot kernctl_put_subbuf error path"); |
319 | } | |
07b86b52 JD |
320 | end_unlock: |
321 | pthread_mutex_unlock(&stream->lock); | |
322 | end: | |
323 | rcu_read_unlock(); | |
324 | return ret; | |
325 | } | |
326 | ||
327 | /* | |
328 | * Read the whole metadata available for a snapshot. | |
329 | * | |
330 | * Returns 0 on success, < 0 on error | |
331 | */ | |
332 | int lttng_kconsumer_snapshot_metadata(uint64_t key, char *path, | |
e2039c7a | 333 | uint64_t relayd_id, struct lttng_consumer_local_data *ctx) |
07b86b52 | 334 | { |
d771f832 DG |
335 | int ret, use_relayd = 0; |
336 | ssize_t ret_read; | |
07b86b52 JD |
337 | struct lttng_consumer_channel *metadata_channel; |
338 | struct lttng_consumer_stream *metadata_stream; | |
d771f832 DG |
339 | |
340 | assert(ctx); | |
07b86b52 JD |
341 | |
342 | DBG("Kernel consumer snapshot metadata with key %" PRIu64 " at path %s", | |
343 | key, path); | |
344 | ||
345 | rcu_read_lock(); | |
346 | ||
347 | metadata_channel = consumer_find_channel(key); | |
348 | if (!metadata_channel) { | |
d771f832 | 349 | ERR("Kernel snapshot metadata not found for key %" PRIu64, key); |
07b86b52 | 350 | ret = -1; |
d771f832 | 351 | goto error; |
07b86b52 JD |
352 | } |
353 | ||
354 | metadata_stream = metadata_channel->metadata_stream; | |
355 | assert(metadata_stream); | |
356 | ||
d771f832 | 357 | /* Flag once that we have a valid relayd for the stream. */ |
e2039c7a | 358 | if (relayd_id != (uint64_t) -1ULL) { |
d771f832 DG |
359 | use_relayd = 1; |
360 | } | |
361 | ||
362 | if (use_relayd) { | |
10a50311 | 363 | ret = consumer_send_relayd_stream(metadata_stream, path); |
e2039c7a | 364 | if (ret < 0) { |
d771f832 | 365 | goto error; |
e2039c7a | 366 | } |
e2039c7a JD |
367 | } else { |
368 | ret = utils_create_stream_file(path, metadata_stream->name, | |
369 | metadata_stream->chan->tracefile_size, | |
370 | metadata_stream->tracefile_count_current, | |
309167d2 | 371 | metadata_stream->uid, metadata_stream->gid, NULL); |
e2039c7a | 372 | if (ret < 0) { |
d771f832 | 373 | goto error; |
e2039c7a JD |
374 | } |
375 | metadata_stream->out_fd = ret; | |
07b86b52 | 376 | } |
07b86b52 | 377 | |
d771f832 | 378 | do { |
9ce5646a MD |
379 | health_code_update(); |
380 | ||
d771f832 DG |
381 | ret_read = lttng_kconsumer_read_subbuffer(metadata_stream, ctx); |
382 | if (ret_read < 0) { | |
56591bac | 383 | if (ret_read != -EAGAIN) { |
6a00837f | 384 | ERR("Kernel snapshot reading metadata subbuffer (ret: %zd)", |
d771f832 DG |
385 | ret_read); |
386 | goto error; | |
07b86b52 | 387 | } |
d771f832 | 388 | /* ret_read is negative at this point so we will exit the loop. */ |
07b86b52 JD |
389 | continue; |
390 | } | |
d771f832 | 391 | } while (ret_read >= 0); |
07b86b52 | 392 | |
d771f832 DG |
393 | if (use_relayd) { |
394 | close_relayd_stream(metadata_stream); | |
395 | metadata_stream->net_seq_idx = (uint64_t) -1ULL; | |
396 | } else { | |
fdf9986c MD |
397 | if (metadata_stream->out_fd >= 0) { |
398 | ret = close(metadata_stream->out_fd); | |
399 | if (ret < 0) { | |
400 | PERROR("Kernel consumer snapshot metadata close out_fd"); | |
401 | /* | |
402 | * Don't go on error here since the snapshot was successful at this | |
403 | * point but somehow the close failed. | |
404 | */ | |
405 | } | |
406 | metadata_stream->out_fd = -1; | |
e2039c7a | 407 | } |
e2039c7a JD |
408 | } |
409 | ||
07b86b52 | 410 | ret = 0; |
d771f832 | 411 | |
cf53a8a6 JD |
412 | cds_list_del(&metadata_stream->send_node); |
413 | consumer_stream_destroy(metadata_stream, NULL); | |
414 | metadata_channel->metadata_stream = NULL; | |
d771f832 | 415 | error: |
07b86b52 JD |
416 | rcu_read_unlock(); |
417 | return ret; | |
418 | } | |
419 | ||
1803a064 MD |
420 | /* |
421 | * Receive command from session daemon and process it. | |
422 | * | |
423 | * Return 1 on success else a negative value or 0. | |
424 | */ | |
3bd1e081 MD |
425 | int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
426 | int sock, struct pollfd *consumer_sockpoll) | |
427 | { | |
428 | ssize_t ret; | |
0c759fc9 | 429 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 MD |
430 | struct lttcomm_consumer_msg msg; |
431 | ||
9ce5646a MD |
432 | health_code_update(); |
433 | ||
3bd1e081 MD |
434 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
435 | if (ret != sizeof(msg)) { | |
1803a064 | 436 | if (ret > 0) { |
c6857fcf | 437 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
1803a064 MD |
438 | ret = -1; |
439 | } | |
3bd1e081 MD |
440 | return ret; |
441 | } | |
9ce5646a MD |
442 | |
443 | health_code_update(); | |
444 | ||
84382d49 MD |
445 | /* Deprecated command */ |
446 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 447 | |
9ce5646a MD |
448 | health_code_update(); |
449 | ||
b0b335c8 MD |
450 | /* relayd needs RCU read-side protection */ |
451 | rcu_read_lock(); | |
452 | ||
3bd1e081 | 453 | switch (msg.cmd_type) { |
00e2e675 DG |
454 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
455 | { | |
f50f23d9 | 456 | /* Session daemon status message are handled in the following call. */ |
7735ef9e DG |
457 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
458 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, | |
d3e2ba59 JD |
459 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
460 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
461 | goto end_nosignal; |
462 | } | |
3bd1e081 MD |
463 | case LTTNG_CONSUMER_ADD_CHANNEL: |
464 | { | |
465 | struct lttng_consumer_channel *new_channel; | |
e43c41c5 | 466 | int ret_recv; |
3bd1e081 | 467 | |
9ce5646a MD |
468 | health_code_update(); |
469 | ||
f50f23d9 DG |
470 | /* First send a status message before receiving the fds. */ |
471 | ret = consumer_send_status_msg(sock, ret_code); | |
472 | if (ret < 0) { | |
473 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 474 | goto error_fatal; |
f50f23d9 | 475 | } |
9ce5646a MD |
476 | |
477 | health_code_update(); | |
478 | ||
d88aee68 | 479 | DBG("consumer_add_channel %" PRIu64, msg.u.channel.channel_key); |
3bd1e081 | 480 | new_channel = consumer_allocate_channel(msg.u.channel.channel_key, |
ffe60014 DG |
481 | msg.u.channel.session_id, msg.u.channel.pathname, |
482 | msg.u.channel.name, msg.u.channel.uid, msg.u.channel.gid, | |
1624d5b7 JD |
483 | msg.u.channel.relayd_id, msg.u.channel.output, |
484 | msg.u.channel.tracefile_size, | |
1950109e | 485 | msg.u.channel.tracefile_count, 0, |
ecc48a90 JD |
486 | msg.u.channel.monitor, |
487 | msg.u.channel.live_timer_interval); | |
3bd1e081 | 488 | if (new_channel == NULL) { |
f73fabfd | 489 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
3bd1e081 MD |
490 | goto end_nosignal; |
491 | } | |
ffe60014 | 492 | new_channel->nb_init_stream_left = msg.u.channel.nb_init_streams; |
95a1109b JD |
493 | switch (msg.u.channel.output) { |
494 | case LTTNG_EVENT_SPLICE: | |
495 | new_channel->output = CONSUMER_CHANNEL_SPLICE; | |
496 | break; | |
497 | case LTTNG_EVENT_MMAP: | |
498 | new_channel->output = CONSUMER_CHANNEL_MMAP; | |
499 | break; | |
500 | default: | |
501 | ERR("Channel output unknown %d", msg.u.channel.output); | |
502 | goto end_nosignal; | |
503 | } | |
ffe60014 DG |
504 | |
505 | /* Translate and save channel type. */ | |
506 | switch (msg.u.channel.type) { | |
507 | case CONSUMER_CHANNEL_TYPE_DATA: | |
508 | case CONSUMER_CHANNEL_TYPE_METADATA: | |
509 | new_channel->type = msg.u.channel.type; | |
510 | break; | |
511 | default: | |
512 | assert(0); | |
513 | goto end_nosignal; | |
514 | }; | |
515 | ||
9ce5646a MD |
516 | health_code_update(); |
517 | ||
3bd1e081 | 518 | if (ctx->on_recv_channel != NULL) { |
e43c41c5 JD |
519 | ret_recv = ctx->on_recv_channel(new_channel); |
520 | if (ret_recv == 0) { | |
521 | ret = consumer_add_channel(new_channel, ctx); | |
522 | } else if (ret_recv < 0) { | |
3bd1e081 MD |
523 | goto end_nosignal; |
524 | } | |
525 | } else { | |
e43c41c5 | 526 | ret = consumer_add_channel(new_channel, ctx); |
3bd1e081 | 527 | } |
94d49140 JD |
528 | if (CONSUMER_CHANNEL_TYPE_DATA) { |
529 | consumer_timer_live_start(new_channel, | |
530 | msg.u.channel.live_timer_interval); | |
531 | } | |
e43c41c5 | 532 | |
9ce5646a MD |
533 | health_code_update(); |
534 | ||
e43c41c5 | 535 | /* If we received an error in add_channel, we need to report it. */ |
821fffb2 | 536 | if (ret < 0) { |
1803a064 MD |
537 | ret = consumer_send_status_msg(sock, ret); |
538 | if (ret < 0) { | |
539 | goto error_fatal; | |
540 | } | |
e43c41c5 JD |
541 | goto end_nosignal; |
542 | } | |
543 | ||
3bd1e081 MD |
544 | goto end_nosignal; |
545 | } | |
546 | case LTTNG_CONSUMER_ADD_STREAM: | |
547 | { | |
dae10966 DG |
548 | int fd; |
549 | struct lttng_pipe *stream_pipe; | |
00e2e675 | 550 | struct lttng_consumer_stream *new_stream; |
ffe60014 | 551 | struct lttng_consumer_channel *channel; |
c80048c6 | 552 | int alloc_ret = 0; |
3bd1e081 | 553 | |
ffe60014 DG |
554 | /* |
555 | * Get stream's channel reference. Needed when adding the stream to the | |
556 | * global hash table. | |
557 | */ | |
558 | channel = consumer_find_channel(msg.u.stream.channel_key); | |
559 | if (!channel) { | |
560 | /* | |
561 | * We could not find the channel. Can happen if cpu hotplug | |
562 | * happens while tearing down. | |
563 | */ | |
d88aee68 | 564 | ERR("Unable to find channel key %" PRIu64, msg.u.stream.channel_key); |
e462382a | 565 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
ffe60014 DG |
566 | } |
567 | ||
9ce5646a MD |
568 | health_code_update(); |
569 | ||
f50f23d9 DG |
570 | /* First send a status message before receiving the fds. */ |
571 | ret = consumer_send_status_msg(sock, ret_code); | |
1803a064 | 572 | if (ret < 0) { |
d771f832 | 573 | /* Somehow, the session daemon is not responding anymore. */ |
1803a064 MD |
574 | goto error_fatal; |
575 | } | |
9ce5646a MD |
576 | |
577 | health_code_update(); | |
578 | ||
0c759fc9 | 579 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
d771f832 | 580 | /* Channel was not found. */ |
f50f23d9 DG |
581 | goto end_nosignal; |
582 | } | |
583 | ||
d771f832 | 584 | /* Blocking call */ |
9ce5646a MD |
585 | health_poll_entry(); |
586 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
587 | health_poll_exit(); | |
84382d49 MD |
588 | if (ret) { |
589 | goto error_fatal; | |
3bd1e081 | 590 | } |
00e2e675 | 591 | |
9ce5646a MD |
592 | health_code_update(); |
593 | ||
00e2e675 | 594 | /* Get stream file descriptor from socket */ |
f2fc6720 MD |
595 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); |
596 | if (ret != sizeof(fd)) { | |
f73fabfd | 597 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
3f8e211f | 598 | rcu_read_unlock(); |
3bd1e081 MD |
599 | return ret; |
600 | } | |
3bd1e081 | 601 | |
9ce5646a MD |
602 | health_code_update(); |
603 | ||
f50f23d9 DG |
604 | /* |
605 | * Send status code to session daemon only if the recv works. If the | |
606 | * above recv() failed, the session daemon is notified through the | |
607 | * error socket and the teardown is eventually done. | |
608 | */ | |
609 | ret = consumer_send_status_msg(sock, ret_code); | |
610 | if (ret < 0) { | |
611 | /* Somehow, the session daemon is not responding anymore. */ | |
612 | goto end_nosignal; | |
613 | } | |
614 | ||
9ce5646a MD |
615 | health_code_update(); |
616 | ||
ffe60014 DG |
617 | new_stream = consumer_allocate_stream(channel->key, |
618 | fd, | |
619 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
620 | channel->name, | |
621 | channel->uid, | |
622 | channel->gid, | |
623 | channel->relayd_id, | |
624 | channel->session_id, | |
625 | msg.u.stream.cpu, | |
626 | &alloc_ret, | |
4891ece8 DG |
627 | channel->type, |
628 | channel->monitor); | |
3bd1e081 | 629 | if (new_stream == NULL) { |
c80048c6 MD |
630 | switch (alloc_ret) { |
631 | case -ENOMEM: | |
632 | case -EINVAL: | |
633 | default: | |
634 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
635 | break; | |
c80048c6 | 636 | } |
3f8e211f | 637 | goto end_nosignal; |
3bd1e081 | 638 | } |
d771f832 | 639 | |
ffe60014 DG |
640 | new_stream->chan = channel; |
641 | new_stream->wait_fd = fd; | |
07b86b52 JD |
642 | switch (channel->output) { |
643 | case CONSUMER_CHANNEL_SPLICE: | |
644 | new_stream->output = LTTNG_EVENT_SPLICE; | |
645 | break; | |
646 | case CONSUMER_CHANNEL_MMAP: | |
647 | new_stream->output = LTTNG_EVENT_MMAP; | |
648 | break; | |
649 | default: | |
650 | ERR("Stream output unknown %d", channel->output); | |
651 | goto end_nosignal; | |
652 | } | |
00e2e675 | 653 | |
a0c83db9 DG |
654 | /* |
655 | * We've just assigned the channel to the stream so increment the | |
07b86b52 JD |
656 | * refcount right now. We don't need to increment the refcount for |
657 | * streams in no monitor because we handle manually the cleanup of | |
658 | * those. It is very important to make sure there is NO prior | |
659 | * consumer_del_stream() calls or else the refcount will be unbalanced. | |
a0c83db9 | 660 | */ |
07b86b52 JD |
661 | if (channel->monitor) { |
662 | uatomic_inc(&new_stream->chan->refcount); | |
663 | } | |
9d9353f9 | 664 | |
fb3a43a9 DG |
665 | /* |
666 | * The buffer flush is done on the session daemon side for the kernel | |
667 | * so no need for the stream "hangup_flush_done" variable to be | |
668 | * tracked. This is important for a kernel stream since we don't rely | |
669 | * on the flush state of the stream to read data. It's not the case for | |
670 | * user space tracing. | |
671 | */ | |
672 | new_stream->hangup_flush_done = 0; | |
673 | ||
9ce5646a MD |
674 | health_code_update(); |
675 | ||
633d0084 DG |
676 | if (ctx->on_recv_stream) { |
677 | ret = ctx->on_recv_stream(new_stream); | |
678 | if (ret < 0) { | |
d771f832 | 679 | consumer_stream_free(new_stream); |
633d0084 | 680 | goto end_nosignal; |
fb3a43a9 | 681 | } |
633d0084 | 682 | } |
fb3a43a9 | 683 | |
9ce5646a MD |
684 | health_code_update(); |
685 | ||
07b86b52 JD |
686 | if (new_stream->metadata_flag) { |
687 | channel->metadata_stream = new_stream; | |
688 | } | |
689 | ||
2bba9e53 DG |
690 | /* Do not monitor this stream. */ |
691 | if (!channel->monitor) { | |
5eecee74 | 692 | DBG("Kernel consumer add stream %s in no monitor mode with " |
6dc3064a | 693 | "relayd id %" PRIu64, new_stream->name, |
5eecee74 | 694 | new_stream->net_seq_idx); |
10a50311 | 695 | cds_list_add(&new_stream->send_node, &channel->streams.head); |
6dc3064a DG |
696 | break; |
697 | } | |
698 | ||
e1b71bdc DG |
699 | /* Send stream to relayd if the stream has an ID. */ |
700 | if (new_stream->net_seq_idx != (uint64_t) -1ULL) { | |
194ee077 DG |
701 | ret = consumer_send_relayd_stream(new_stream, |
702 | new_stream->chan->pathname); | |
e1b71bdc DG |
703 | if (ret < 0) { |
704 | consumer_stream_free(new_stream); | |
705 | goto end_nosignal; | |
706 | } | |
e2039c7a JD |
707 | } |
708 | ||
50f8ae69 | 709 | /* Get the right pipe where the stream will be sent. */ |
633d0084 | 710 | if (new_stream->metadata_flag) { |
5ab66908 MD |
711 | ret = consumer_add_metadata_stream(new_stream); |
712 | if (ret) { | |
713 | ERR("Consumer add metadata stream %" PRIu64 " failed. Continuing", | |
714 | new_stream->key); | |
715 | consumer_stream_free(new_stream); | |
716 | goto end_nosignal; | |
717 | } | |
dae10966 | 718 | stream_pipe = ctx->consumer_metadata_pipe; |
3bd1e081 | 719 | } else { |
5ab66908 MD |
720 | ret = consumer_add_data_stream(new_stream); |
721 | if (ret) { | |
722 | ERR("Consumer add stream %" PRIu64 " failed. Continuing", | |
723 | new_stream->key); | |
724 | consumer_stream_free(new_stream); | |
725 | goto end_nosignal; | |
726 | } | |
dae10966 | 727 | stream_pipe = ctx->consumer_data_pipe; |
50f8ae69 DG |
728 | } |
729 | ||
5ab66908 MD |
730 | /* Vitible to other threads */ |
731 | new_stream->globally_visible = 1; | |
732 | ||
9ce5646a MD |
733 | health_code_update(); |
734 | ||
dae10966 | 735 | ret = lttng_pipe_write(stream_pipe, &new_stream, sizeof(new_stream)); |
50f8ae69 | 736 | if (ret < 0) { |
dae10966 | 737 | ERR("Consumer write %s stream to pipe %d", |
50f8ae69 | 738 | new_stream->metadata_flag ? "metadata" : "data", |
dae10966 | 739 | lttng_pipe_get_writefd(stream_pipe)); |
5ab66908 MD |
740 | if (new_stream->metadata_flag) { |
741 | consumer_del_stream_for_metadata(new_stream); | |
742 | } else { | |
743 | consumer_del_stream_for_data(new_stream); | |
744 | } | |
50f8ae69 | 745 | goto end_nosignal; |
3bd1e081 | 746 | } |
00e2e675 | 747 | |
50f8ae69 | 748 | DBG("Kernel consumer ADD_STREAM %s (fd: %d) with relayd id %" PRIu64, |
ffe60014 | 749 | new_stream->name, fd, new_stream->relayd_stream_id); |
3bd1e081 MD |
750 | break; |
751 | } | |
a4baae1b JD |
752 | case LTTNG_CONSUMER_STREAMS_SENT: |
753 | { | |
754 | struct lttng_consumer_channel *channel; | |
755 | ||
756 | /* | |
757 | * Get stream's channel reference. Needed when adding the stream to the | |
758 | * global hash table. | |
759 | */ | |
760 | channel = consumer_find_channel(msg.u.sent_streams.channel_key); | |
761 | if (!channel) { | |
762 | /* | |
763 | * We could not find the channel. Can happen if cpu hotplug | |
764 | * happens while tearing down. | |
765 | */ | |
766 | ERR("Unable to find channel key %" PRIu64, | |
767 | msg.u.sent_streams.channel_key); | |
e462382a | 768 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
a4baae1b JD |
769 | } |
770 | ||
771 | health_code_update(); | |
772 | ||
773 | /* | |
774 | * Send status code to session daemon. | |
775 | */ | |
776 | ret = consumer_send_status_msg(sock, ret_code); | |
f261ad0a | 777 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
a4baae1b JD |
778 | /* Somehow, the session daemon is not responding anymore. */ |
779 | goto end_nosignal; | |
780 | } | |
781 | ||
782 | health_code_update(); | |
783 | ||
784 | /* | |
785 | * We should not send this message if we don't monitor the | |
786 | * streams in this channel. | |
787 | */ | |
788 | if (!channel->monitor) { | |
789 | break; | |
790 | } | |
791 | ||
792 | health_code_update(); | |
793 | /* Send stream to relayd if the stream has an ID. */ | |
794 | if (msg.u.sent_streams.net_seq_idx != (uint64_t) -1ULL) { | |
795 | ret = consumer_send_relayd_streams_sent( | |
796 | msg.u.sent_streams.net_seq_idx); | |
797 | if (ret < 0) { | |
798 | goto end_nosignal; | |
799 | } | |
800 | } | |
801 | break; | |
802 | } | |
3bd1e081 MD |
803 | case LTTNG_CONSUMER_UPDATE_STREAM: |
804 | { | |
3f8e211f DG |
805 | rcu_read_unlock(); |
806 | return -ENOSYS; | |
807 | } | |
808 | case LTTNG_CONSUMER_DESTROY_RELAYD: | |
809 | { | |
a6ba4fe1 | 810 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
3f8e211f DG |
811 | struct consumer_relayd_sock_pair *relayd; |
812 | ||
a6ba4fe1 | 813 | DBG("Kernel consumer destroying relayd %" PRIu64, index); |
3f8e211f DG |
814 | |
815 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 816 | relayd = consumer_find_relayd(index); |
3f8e211f | 817 | if (relayd == NULL) { |
3448e266 | 818 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 819 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
3bd1e081 | 820 | } |
3f8e211f | 821 | |
a6ba4fe1 DG |
822 | /* |
823 | * Each relayd socket pair has a refcount of stream attached to it | |
824 | * which tells if the relayd is still active or not depending on the | |
825 | * refcount value. | |
826 | * | |
827 | * This will set the destroy flag of the relayd object and destroy it | |
828 | * if the refcount reaches zero when called. | |
829 | * | |
830 | * The destroy can happen either here or when a stream fd hangs up. | |
831 | */ | |
f50f23d9 DG |
832 | if (relayd) { |
833 | consumer_flag_relayd_for_destroy(relayd); | |
834 | } | |
835 | ||
9ce5646a MD |
836 | health_code_update(); |
837 | ||
f50f23d9 DG |
838 | ret = consumer_send_status_msg(sock, ret_code); |
839 | if (ret < 0) { | |
840 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 841 | goto error_fatal; |
f50f23d9 | 842 | } |
3f8e211f | 843 | |
3f8e211f | 844 | goto end_nosignal; |
3bd1e081 | 845 | } |
6d805429 | 846 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 847 | { |
c8f59ee5 | 848 | int32_t ret; |
6d805429 | 849 | uint64_t id = msg.u.data_pending.session_id; |
c8f59ee5 | 850 | |
6d805429 | 851 | DBG("Kernel consumer data pending command for id %" PRIu64, id); |
c8f59ee5 | 852 | |
6d805429 | 853 | ret = consumer_data_pending(id); |
c8f59ee5 | 854 | |
9ce5646a MD |
855 | health_code_update(); |
856 | ||
c8f59ee5 DG |
857 | /* Send back returned value to session daemon */ |
858 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
859 | if (ret < 0) { | |
6d805429 | 860 | PERROR("send data pending ret code"); |
1803a064 | 861 | goto error_fatal; |
c8f59ee5 | 862 | } |
f50f23d9 DG |
863 | |
864 | /* | |
865 | * No need to send back a status message since the data pending | |
866 | * returned value is the response. | |
867 | */ | |
c8f59ee5 | 868 | break; |
53632229 | 869 | } |
6dc3064a DG |
870 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
871 | { | |
07b86b52 JD |
872 | if (msg.u.snapshot_channel.metadata == 1) { |
873 | ret = lttng_kconsumer_snapshot_metadata(msg.u.snapshot_channel.key, | |
e2039c7a JD |
874 | msg.u.snapshot_channel.pathname, |
875 | msg.u.snapshot_channel.relayd_id, ctx); | |
07b86b52 JD |
876 | if (ret < 0) { |
877 | ERR("Snapshot metadata failed"); | |
e462382a | 878 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; |
07b86b52 JD |
879 | } |
880 | } else { | |
881 | ret = lttng_kconsumer_snapshot_channel(msg.u.snapshot_channel.key, | |
882 | msg.u.snapshot_channel.pathname, | |
5c786ded JD |
883 | msg.u.snapshot_channel.relayd_id, |
884 | msg.u.snapshot_channel.max_stream_size, | |
885 | ctx); | |
07b86b52 JD |
886 | if (ret < 0) { |
887 | ERR("Snapshot channel failed"); | |
e462382a | 888 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
07b86b52 JD |
889 | } |
890 | } | |
891 | ||
9ce5646a MD |
892 | health_code_update(); |
893 | ||
6dc3064a DG |
894 | ret = consumer_send_status_msg(sock, ret_code); |
895 | if (ret < 0) { | |
896 | /* Somehow, the session daemon is not responding anymore. */ | |
897 | goto end_nosignal; | |
898 | } | |
899 | break; | |
900 | } | |
07b86b52 JD |
901 | case LTTNG_CONSUMER_DESTROY_CHANNEL: |
902 | { | |
903 | uint64_t key = msg.u.destroy_channel.key; | |
904 | struct lttng_consumer_channel *channel; | |
905 | ||
906 | channel = consumer_find_channel(key); | |
907 | if (!channel) { | |
908 | ERR("Kernel consumer destroy channel %" PRIu64 " not found", key); | |
e462382a | 909 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
07b86b52 JD |
910 | } |
911 | ||
9ce5646a MD |
912 | health_code_update(); |
913 | ||
07b86b52 JD |
914 | ret = consumer_send_status_msg(sock, ret_code); |
915 | if (ret < 0) { | |
916 | /* Somehow, the session daemon is not responding anymore. */ | |
917 | goto end_nosignal; | |
918 | } | |
919 | ||
9ce5646a MD |
920 | health_code_update(); |
921 | ||
15dc512a DG |
922 | /* Stop right now if no channel was found. */ |
923 | if (!channel) { | |
924 | goto end_nosignal; | |
925 | } | |
926 | ||
07b86b52 JD |
927 | /* |
928 | * This command should ONLY be issued for channel with streams set in | |
929 | * no monitor mode. | |
930 | */ | |
931 | assert(!channel->monitor); | |
932 | ||
933 | /* | |
934 | * The refcount should ALWAYS be 0 in the case of a channel in no | |
935 | * monitor mode. | |
936 | */ | |
937 | assert(!uatomic_sub_return(&channel->refcount, 1)); | |
938 | ||
939 | consumer_del_channel(channel); | |
940 | ||
941 | goto end_nosignal; | |
942 | } | |
3bd1e081 | 943 | default: |
3f8e211f | 944 | goto end_nosignal; |
3bd1e081 | 945 | } |
3f8e211f | 946 | |
3bd1e081 | 947 | end_nosignal: |
b0b335c8 | 948 | rcu_read_unlock(); |
4cbc1a04 DG |
949 | |
950 | /* | |
951 | * Return 1 to indicate success since the 0 value can be a socket | |
952 | * shutdown during the recv() or send() call. | |
953 | */ | |
9ce5646a | 954 | health_code_update(); |
4cbc1a04 | 955 | return 1; |
1803a064 MD |
956 | |
957 | error_fatal: | |
958 | rcu_read_unlock(); | |
959 | /* This will issue a consumer stop. */ | |
960 | return -1; | |
3bd1e081 | 961 | } |
d41f73b7 | 962 | |
309167d2 JD |
963 | /* |
964 | * Populate index values of a kernel stream. Values are set in big endian order. | |
965 | * | |
966 | * Return 0 on success or else a negative value. | |
967 | */ | |
50adc264 | 968 | static int get_index_values(struct ctf_packet_index *index, int infd) |
309167d2 JD |
969 | { |
970 | int ret; | |
971 | ||
972 | ret = kernctl_get_timestamp_begin(infd, &index->timestamp_begin); | |
973 | if (ret < 0) { | |
974 | PERROR("kernctl_get_timestamp_begin"); | |
975 | goto error; | |
976 | } | |
977 | index->timestamp_begin = htobe64(index->timestamp_begin); | |
978 | ||
979 | ret = kernctl_get_timestamp_end(infd, &index->timestamp_end); | |
980 | if (ret < 0) { | |
981 | PERROR("kernctl_get_timestamp_end"); | |
982 | goto error; | |
983 | } | |
984 | index->timestamp_end = htobe64(index->timestamp_end); | |
985 | ||
986 | ret = kernctl_get_events_discarded(infd, &index->events_discarded); | |
987 | if (ret < 0) { | |
988 | PERROR("kernctl_get_events_discarded"); | |
989 | goto error; | |
990 | } | |
991 | index->events_discarded = htobe64(index->events_discarded); | |
992 | ||
993 | ret = kernctl_get_content_size(infd, &index->content_size); | |
994 | if (ret < 0) { | |
995 | PERROR("kernctl_get_content_size"); | |
996 | goto error; | |
997 | } | |
998 | index->content_size = htobe64(index->content_size); | |
999 | ||
1000 | ret = kernctl_get_packet_size(infd, &index->packet_size); | |
1001 | if (ret < 0) { | |
1002 | PERROR("kernctl_get_packet_size"); | |
1003 | goto error; | |
1004 | } | |
1005 | index->packet_size = htobe64(index->packet_size); | |
1006 | ||
1007 | ret = kernctl_get_stream_id(infd, &index->stream_id); | |
1008 | if (ret < 0) { | |
1009 | PERROR("kernctl_get_stream_id"); | |
1010 | goto error; | |
1011 | } | |
1012 | index->stream_id = htobe64(index->stream_id); | |
1013 | ||
1014 | error: | |
1015 | return ret; | |
1016 | } | |
94d49140 JD |
1017 | /* |
1018 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
1019 | * metadata thread can consumer them. | |
1020 | * | |
1021 | * Metadata stream lock MUST be acquired. | |
1022 | * | |
1023 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream | |
1024 | * is empty or a negative value on error. | |
1025 | */ | |
1026 | int lttng_kconsumer_sync_metadata(struct lttng_consumer_stream *metadata) | |
1027 | { | |
1028 | int ret; | |
1029 | ||
1030 | assert(metadata); | |
1031 | ||
1032 | ret = kernctl_buffer_flush(metadata->wait_fd); | |
1033 | if (ret < 0) { | |
1034 | ERR("Failed to flush kernel stream"); | |
1035 | goto end; | |
1036 | } | |
1037 | ||
1038 | ret = kernctl_snapshot(metadata->wait_fd); | |
1039 | if (ret < 0) { | |
1040 | if (errno != EAGAIN) { | |
1041 | ERR("Sync metadata, taking kernel snapshot failed."); | |
1042 | goto end; | |
1043 | } | |
1044 | DBG("Sync metadata, no new kernel metadata"); | |
1045 | /* No new metadata, exit. */ | |
1046 | ret = ENODATA; | |
1047 | goto end; | |
1048 | } | |
1049 | ||
1050 | end: | |
1051 | return ret; | |
1052 | } | |
309167d2 | 1053 | |
d41f73b7 MD |
1054 | /* |
1055 | * Consume data on a file descriptor and write it on a trace file. | |
1056 | */ | |
4078b776 | 1057 | ssize_t lttng_kconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
1058 | struct lttng_consumer_local_data *ctx) |
1059 | { | |
1d4dfdef | 1060 | unsigned long len, subbuf_size, padding; |
1c20f0e2 | 1061 | int err, write_index = 1; |
4078b776 | 1062 | ssize_t ret = 0; |
d41f73b7 | 1063 | int infd = stream->wait_fd; |
50adc264 | 1064 | struct ctf_packet_index index; |
d41f73b7 MD |
1065 | |
1066 | DBG("In read_subbuffer (infd : %d)", infd); | |
309167d2 | 1067 | |
d41f73b7 MD |
1068 | /* Get the next subbuffer */ |
1069 | err = kernctl_get_next_subbuf(infd); | |
1070 | if (err != 0) { | |
d41f73b7 MD |
1071 | /* |
1072 | * This is a debug message even for single-threaded consumer, | |
1073 | * because poll() have more relaxed criterions than get subbuf, | |
1074 | * so get_subbuf may fail for short race windows where poll() | |
1075 | * would issue wakeups. | |
1076 | */ | |
1077 | DBG("Reserving sub buffer failed (everything is normal, " | |
1078 | "it is due to concurrency)"); | |
56591bac | 1079 | ret = -errno; |
d41f73b7 MD |
1080 | goto end; |
1081 | } | |
1082 | ||
1d4dfdef DG |
1083 | /* Get the full subbuffer size including padding */ |
1084 | err = kernctl_get_padded_subbuf_size(infd, &len); | |
1085 | if (err != 0) { | |
5a510c9f | 1086 | PERROR("Getting sub-buffer len failed."); |
8265f19e MD |
1087 | err = kernctl_put_subbuf(infd); |
1088 | if (err != 0) { | |
1089 | if (errno == EFAULT) { | |
5a510c9f | 1090 | PERROR("Error in unreserving sub buffer\n"); |
8265f19e MD |
1091 | } else if (errno == EIO) { |
1092 | /* Should never happen with newer LTTng versions */ | |
5a510c9f | 1093 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e MD |
1094 | } |
1095 | ret = -errno; | |
1096 | goto end; | |
1097 | } | |
56591bac | 1098 | ret = -errno; |
1d4dfdef DG |
1099 | goto end; |
1100 | } | |
1101 | ||
1c20f0e2 | 1102 | if (!stream->metadata_flag) { |
309167d2 JD |
1103 | ret = get_index_values(&index, infd); |
1104 | if (ret < 0) { | |
8265f19e MD |
1105 | err = kernctl_put_subbuf(infd); |
1106 | if (err != 0) { | |
1107 | if (errno == EFAULT) { | |
5a510c9f | 1108 | PERROR("Error in unreserving sub buffer\n"); |
8265f19e MD |
1109 | } else if (errno == EIO) { |
1110 | /* Should never happen with newer LTTng versions */ | |
5a510c9f | 1111 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e MD |
1112 | } |
1113 | ret = -errno; | |
1114 | goto end; | |
1115 | } | |
309167d2 JD |
1116 | goto end; |
1117 | } | |
1c20f0e2 JD |
1118 | } else { |
1119 | write_index = 0; | |
309167d2 JD |
1120 | } |
1121 | ||
ffe60014 | 1122 | switch (stream->chan->output) { |
07b86b52 | 1123 | case CONSUMER_CHANNEL_SPLICE: |
1d4dfdef DG |
1124 | /* |
1125 | * XXX: The lttng-modules splice "actor" does not handle copying | |
1126 | * partial pages hence only using the subbuffer size without the | |
1127 | * padding makes the splice fail. | |
1128 | */ | |
1129 | subbuf_size = len; | |
1130 | padding = 0; | |
1131 | ||
1132 | /* splice the subbuffer to the tracefile */ | |
91dfef6e | 1133 | ret = lttng_consumer_on_read_subbuffer_splice(ctx, stream, subbuf_size, |
309167d2 | 1134 | padding, &index); |
91dfef6e DG |
1135 | /* |
1136 | * XXX: Splice does not support network streaming so the return value | |
1137 | * is simply checked against subbuf_size and not like the mmap() op. | |
1138 | */ | |
1d4dfdef DG |
1139 | if (ret != subbuf_size) { |
1140 | /* | |
1141 | * display the error but continue processing to try | |
1142 | * to release the subbuffer | |
1143 | */ | |
1144 | ERR("Error splicing to tracefile (ret: %zd != len: %lu)", | |
1145 | ret, subbuf_size); | |
309167d2 | 1146 | write_index = 0; |
1d4dfdef DG |
1147 | } |
1148 | break; | |
07b86b52 | 1149 | case CONSUMER_CHANNEL_MMAP: |
1d4dfdef DG |
1150 | /* Get subbuffer size without padding */ |
1151 | err = kernctl_get_subbuf_size(infd, &subbuf_size); | |
1152 | if (err != 0) { | |
5a510c9f | 1153 | PERROR("Getting sub-buffer len failed."); |
8265f19e MD |
1154 | err = kernctl_put_subbuf(infd); |
1155 | if (err != 0) { | |
1156 | if (errno == EFAULT) { | |
5a510c9f | 1157 | PERROR("Error in unreserving sub buffer\n"); |
8265f19e MD |
1158 | } else if (errno == EIO) { |
1159 | /* Should never happen with newer LTTng versions */ | |
5a510c9f | 1160 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e MD |
1161 | } |
1162 | ret = -errno; | |
1163 | goto end; | |
1164 | } | |
56591bac | 1165 | ret = -errno; |
1d4dfdef DG |
1166 | goto end; |
1167 | } | |
47e81c02 | 1168 | |
1d4dfdef DG |
1169 | /* Make sure the tracer is not gone mad on us! */ |
1170 | assert(len >= subbuf_size); | |
1171 | ||
1172 | padding = len - subbuf_size; | |
1173 | ||
1174 | /* write the subbuffer to the tracefile */ | |
91dfef6e | 1175 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, |
309167d2 | 1176 | padding, &index); |
91dfef6e DG |
1177 | /* |
1178 | * The mmap operation should write subbuf_size amount of data when | |
1179 | * network streaming or the full padding (len) size when we are _not_ | |
1180 | * streaming. | |
1181 | */ | |
d88aee68 DG |
1182 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
1183 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
1d4dfdef | 1184 | /* |
91dfef6e | 1185 | * Display the error but continue processing to try to release the |
2336629e DG |
1186 | * subbuffer. This is a DBG statement since this is possible to |
1187 | * happen without being a critical error. | |
1d4dfdef | 1188 | */ |
2336629e | 1189 | DBG("Error writing to tracefile " |
91dfef6e DG |
1190 | "(ret: %zd != len: %lu != subbuf_size: %lu)", |
1191 | ret, len, subbuf_size); | |
309167d2 | 1192 | write_index = 0; |
1d4dfdef DG |
1193 | } |
1194 | break; | |
1195 | default: | |
1196 | ERR("Unknown output method"); | |
56591bac | 1197 | ret = -EPERM; |
d41f73b7 MD |
1198 | } |
1199 | ||
1200 | err = kernctl_put_next_subbuf(infd); | |
1201 | if (err != 0) { | |
d41f73b7 | 1202 | if (errno == EFAULT) { |
5a510c9f | 1203 | PERROR("Error in unreserving sub buffer\n"); |
d41f73b7 MD |
1204 | } else if (errno == EIO) { |
1205 | /* Should never happen with newer LTTng versions */ | |
5a510c9f | 1206 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
d41f73b7 | 1207 | } |
56591bac | 1208 | ret = -errno; |
d41f73b7 MD |
1209 | goto end; |
1210 | } | |
1211 | ||
309167d2 | 1212 | /* Write index if needed. */ |
1c20f0e2 JD |
1213 | if (!write_index) { |
1214 | goto end; | |
1215 | } | |
1216 | ||
94d49140 JD |
1217 | if (stream->chan->live_timer_interval && !stream->metadata_flag) { |
1218 | /* | |
1219 | * In live, block until all the metadata is sent. | |
1220 | */ | |
1221 | err = consumer_stream_sync_metadata(ctx, stream->session_id); | |
1222 | if (err < 0) { | |
1223 | goto end; | |
1224 | } | |
1225 | } | |
1226 | ||
1c20f0e2 JD |
1227 | err = consumer_stream_write_index(stream, &index); |
1228 | if (err < 0) { | |
1229 | goto end; | |
309167d2 JD |
1230 | } |
1231 | ||
d41f73b7 MD |
1232 | end: |
1233 | return ret; | |
1234 | } | |
1235 | ||
1236 | int lttng_kconsumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
1237 | { | |
1238 | int ret; | |
ffe60014 DG |
1239 | |
1240 | assert(stream); | |
1241 | ||
2bba9e53 DG |
1242 | /* |
1243 | * Don't create anything if this is set for streaming or should not be | |
1244 | * monitored. | |
1245 | */ | |
1246 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { | |
fe4477ee JD |
1247 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
1248 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
309167d2 | 1249 | stream->uid, stream->gid, NULL); |
fe4477ee JD |
1250 | if (ret < 0) { |
1251 | goto error; | |
1252 | } | |
1253 | stream->out_fd = ret; | |
1254 | stream->tracefile_size_current = 0; | |
309167d2 JD |
1255 | |
1256 | if (!stream->metadata_flag) { | |
1257 | ret = index_create_file(stream->chan->pathname, | |
1258 | stream->name, stream->uid, stream->gid, | |
1259 | stream->chan->tracefile_size, | |
1260 | stream->tracefile_count_current); | |
1261 | if (ret < 0) { | |
1262 | goto error; | |
1263 | } | |
1264 | stream->index_fd = ret; | |
1265 | } | |
ffe60014 | 1266 | } |
d41f73b7 | 1267 | |
d41f73b7 MD |
1268 | if (stream->output == LTTNG_EVENT_MMAP) { |
1269 | /* get the len of the mmap region */ | |
1270 | unsigned long mmap_len; | |
1271 | ||
1272 | ret = kernctl_get_mmap_len(stream->wait_fd, &mmap_len); | |
1273 | if (ret != 0) { | |
ffe60014 | 1274 | PERROR("kernctl_get_mmap_len"); |
56591bac | 1275 | ret = -errno; |
d41f73b7 MD |
1276 | goto error_close_fd; |
1277 | } | |
1278 | stream->mmap_len = (size_t) mmap_len; | |
1279 | ||
ffe60014 DG |
1280 | stream->mmap_base = mmap(NULL, stream->mmap_len, PROT_READ, |
1281 | MAP_PRIVATE, stream->wait_fd, 0); | |
d41f73b7 | 1282 | if (stream->mmap_base == MAP_FAILED) { |
ffe60014 | 1283 | PERROR("Error mmaping"); |
d41f73b7 MD |
1284 | ret = -1; |
1285 | goto error_close_fd; | |
1286 | } | |
1287 | } | |
1288 | ||
1289 | /* we return 0 to let the library handle the FD internally */ | |
1290 | return 0; | |
1291 | ||
1292 | error_close_fd: | |
2f225ce2 | 1293 | if (stream->out_fd >= 0) { |
d41f73b7 MD |
1294 | int err; |
1295 | ||
1296 | err = close(stream->out_fd); | |
1297 | assert(!err); | |
2f225ce2 | 1298 | stream->out_fd = -1; |
d41f73b7 MD |
1299 | } |
1300 | error: | |
1301 | return ret; | |
1302 | } | |
1303 | ||
ca22feea DG |
1304 | /* |
1305 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
1306 | * stream. Consumer data lock MUST be acquired before calling this function |
1307 | * and the stream lock. | |
ca22feea | 1308 | * |
6d805429 | 1309 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
1310 | * data is available for trace viewer reading. |
1311 | */ | |
6d805429 | 1312 | int lttng_kconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
1313 | { |
1314 | int ret; | |
1315 | ||
1316 | assert(stream); | |
1317 | ||
873b9e9a MD |
1318 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
1319 | ret = 0; | |
1320 | goto end; | |
1321 | } | |
1322 | ||
ca22feea DG |
1323 | ret = kernctl_get_next_subbuf(stream->wait_fd); |
1324 | if (ret == 0) { | |
1325 | /* There is still data so let's put back this subbuffer. */ | |
1326 | ret = kernctl_put_subbuf(stream->wait_fd); | |
1327 | assert(ret == 0); | |
6d805429 | 1328 | ret = 1; /* Data is pending */ |
4e9a4686 | 1329 | goto end; |
ca22feea DG |
1330 | } |
1331 | ||
6d805429 DG |
1332 | /* Data is NOT pending and ready to be read. */ |
1333 | ret = 0; | |
ca22feea | 1334 | |
6efae65e DG |
1335 | end: |
1336 | return ret; | |
ca22feea | 1337 | } |