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