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, | |
135347bd | 117 | uint64_t relayd_id, uint64_t nb_packets_per_stream, |
5c786ded | 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 | ||
135347bd MD |
223 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
224 | produced_pos, nb_packets_per_stream, | |
225 | stream->max_sb_size); | |
5c786ded | 226 | |
07b86b52 JD |
227 | while (consumed_pos < produced_pos) { |
228 | ssize_t read_len; | |
229 | unsigned long len, padded_len; | |
230 | ||
9ce5646a MD |
231 | health_code_update(); |
232 | ||
07b86b52 JD |
233 | DBG("Kernel consumer taking snapshot at pos %lu", consumed_pos); |
234 | ||
235 | ret = kernctl_get_subbuf(stream->wait_fd, &consumed_pos); | |
236 | if (ret < 0) { | |
237 | if (errno != EAGAIN) { | |
238 | PERROR("kernctl_get_subbuf snapshot"); | |
56591bac | 239 | ret = -errno; |
07b86b52 JD |
240 | goto end_unlock; |
241 | } | |
242 | DBG("Kernel consumer get subbuf failed. Skipping it."); | |
243 | consumed_pos += stream->max_sb_size; | |
244 | continue; | |
245 | } | |
246 | ||
247 | ret = kernctl_get_subbuf_size(stream->wait_fd, &len); | |
248 | if (ret < 0) { | |
249 | ERR("Snapshot kernctl_get_subbuf_size"); | |
56591bac | 250 | ret = -errno; |
29decac3 | 251 | goto error_put_subbuf; |
07b86b52 JD |
252 | } |
253 | ||
254 | ret = kernctl_get_padded_subbuf_size(stream->wait_fd, &padded_len); | |
255 | if (ret < 0) { | |
256 | ERR("Snapshot kernctl_get_padded_subbuf_size"); | |
56591bac | 257 | ret = -errno; |
29decac3 | 258 | goto error_put_subbuf; |
07b86b52 JD |
259 | } |
260 | ||
261 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
309167d2 | 262 | padded_len - len, NULL); |
07b86b52 | 263 | /* |
29decac3 DG |
264 | * We write the padded len in local tracefiles but the data len |
265 | * when using a relay. Display the error but continue processing | |
266 | * to try to release the subbuffer. | |
07b86b52 JD |
267 | */ |
268 | if (relayd_id != (uint64_t) -1ULL) { | |
269 | if (read_len != len) { | |
270 | ERR("Error sending to the relay (ret: %zd != len: %lu)", | |
271 | read_len, len); | |
272 | } | |
273 | } else { | |
274 | if (read_len != padded_len) { | |
275 | ERR("Error writing to tracefile (ret: %zd != len: %lu)", | |
276 | read_len, padded_len); | |
277 | } | |
278 | } | |
279 | ||
280 | ret = kernctl_put_subbuf(stream->wait_fd); | |
281 | if (ret < 0) { | |
282 | ERR("Snapshot kernctl_put_subbuf"); | |
56591bac | 283 | ret = -errno; |
07b86b52 JD |
284 | goto end_unlock; |
285 | } | |
286 | consumed_pos += stream->max_sb_size; | |
287 | } | |
288 | ||
289 | if (relayd_id == (uint64_t) -1ULL) { | |
fdf9986c MD |
290 | if (stream->out_fd >= 0) { |
291 | ret = close(stream->out_fd); | |
292 | if (ret < 0) { | |
293 | PERROR("Kernel consumer snapshot close out_fd"); | |
294 | goto end_unlock; | |
295 | } | |
296 | stream->out_fd = -1; | |
07b86b52 | 297 | } |
07b86b52 JD |
298 | } else { |
299 | close_relayd_stream(stream); | |
300 | stream->net_seq_idx = (uint64_t) -1ULL; | |
301 | } | |
302 | pthread_mutex_unlock(&stream->lock); | |
303 | } | |
304 | ||
305 | /* All good! */ | |
306 | ret = 0; | |
307 | goto end; | |
308 | ||
29decac3 DG |
309 | error_put_subbuf: |
310 | ret = kernctl_put_subbuf(stream->wait_fd); | |
311 | if (ret < 0) { | |
56591bac | 312 | ret = -errno; |
29decac3 DG |
313 | ERR("Snapshot kernctl_put_subbuf error path"); |
314 | } | |
07b86b52 JD |
315 | end_unlock: |
316 | pthread_mutex_unlock(&stream->lock); | |
317 | end: | |
318 | rcu_read_unlock(); | |
319 | return ret; | |
320 | } | |
321 | ||
322 | /* | |
323 | * Read the whole metadata available for a snapshot. | |
324 | * | |
325 | * Returns 0 on success, < 0 on error | |
326 | */ | |
327 | int lttng_kconsumer_snapshot_metadata(uint64_t key, char *path, | |
e2039c7a | 328 | uint64_t relayd_id, struct lttng_consumer_local_data *ctx) |
07b86b52 | 329 | { |
d771f832 DG |
330 | int ret, use_relayd = 0; |
331 | ssize_t ret_read; | |
07b86b52 JD |
332 | struct lttng_consumer_channel *metadata_channel; |
333 | struct lttng_consumer_stream *metadata_stream; | |
d771f832 DG |
334 | |
335 | assert(ctx); | |
07b86b52 JD |
336 | |
337 | DBG("Kernel consumer snapshot metadata with key %" PRIu64 " at path %s", | |
338 | key, path); | |
339 | ||
340 | rcu_read_lock(); | |
341 | ||
342 | metadata_channel = consumer_find_channel(key); | |
343 | if (!metadata_channel) { | |
d771f832 | 344 | ERR("Kernel snapshot metadata not found for key %" PRIu64, key); |
07b86b52 | 345 | ret = -1; |
d771f832 | 346 | goto error; |
07b86b52 JD |
347 | } |
348 | ||
349 | metadata_stream = metadata_channel->metadata_stream; | |
350 | assert(metadata_stream); | |
351 | ||
d771f832 | 352 | /* Flag once that we have a valid relayd for the stream. */ |
e2039c7a | 353 | if (relayd_id != (uint64_t) -1ULL) { |
d771f832 DG |
354 | use_relayd = 1; |
355 | } | |
356 | ||
357 | if (use_relayd) { | |
10a50311 | 358 | ret = consumer_send_relayd_stream(metadata_stream, path); |
e2039c7a | 359 | if (ret < 0) { |
d771f832 | 360 | goto error; |
e2039c7a | 361 | } |
e2039c7a JD |
362 | } else { |
363 | ret = utils_create_stream_file(path, metadata_stream->name, | |
364 | metadata_stream->chan->tracefile_size, | |
365 | metadata_stream->tracefile_count_current, | |
309167d2 | 366 | metadata_stream->uid, metadata_stream->gid, NULL); |
e2039c7a | 367 | if (ret < 0) { |
d771f832 | 368 | goto error; |
e2039c7a JD |
369 | } |
370 | metadata_stream->out_fd = ret; | |
07b86b52 | 371 | } |
07b86b52 | 372 | |
d771f832 | 373 | do { |
9ce5646a MD |
374 | health_code_update(); |
375 | ||
d771f832 DG |
376 | ret_read = lttng_kconsumer_read_subbuffer(metadata_stream, ctx); |
377 | if (ret_read < 0) { | |
56591bac | 378 | if (ret_read != -EAGAIN) { |
6a00837f | 379 | ERR("Kernel snapshot reading metadata subbuffer (ret: %zd)", |
d771f832 DG |
380 | ret_read); |
381 | goto error; | |
07b86b52 | 382 | } |
d771f832 | 383 | /* ret_read is negative at this point so we will exit the loop. */ |
07b86b52 JD |
384 | continue; |
385 | } | |
d771f832 | 386 | } while (ret_read >= 0); |
07b86b52 | 387 | |
d771f832 DG |
388 | if (use_relayd) { |
389 | close_relayd_stream(metadata_stream); | |
390 | metadata_stream->net_seq_idx = (uint64_t) -1ULL; | |
391 | } else { | |
fdf9986c MD |
392 | if (metadata_stream->out_fd >= 0) { |
393 | ret = close(metadata_stream->out_fd); | |
394 | if (ret < 0) { | |
395 | PERROR("Kernel consumer snapshot metadata close out_fd"); | |
396 | /* | |
397 | * Don't go on error here since the snapshot was successful at this | |
398 | * point but somehow the close failed. | |
399 | */ | |
400 | } | |
401 | metadata_stream->out_fd = -1; | |
e2039c7a | 402 | } |
e2039c7a JD |
403 | } |
404 | ||
07b86b52 | 405 | ret = 0; |
d771f832 | 406 | |
cf53a8a6 JD |
407 | cds_list_del(&metadata_stream->send_node); |
408 | consumer_stream_destroy(metadata_stream, NULL); | |
409 | metadata_channel->metadata_stream = NULL; | |
d771f832 | 410 | error: |
07b86b52 JD |
411 | rcu_read_unlock(); |
412 | return ret; | |
413 | } | |
414 | ||
1803a064 MD |
415 | /* |
416 | * Receive command from session daemon and process it. | |
417 | * | |
418 | * Return 1 on success else a negative value or 0. | |
419 | */ | |
3bd1e081 MD |
420 | int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
421 | int sock, struct pollfd *consumer_sockpoll) | |
422 | { | |
423 | ssize_t ret; | |
0c759fc9 | 424 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 MD |
425 | struct lttcomm_consumer_msg msg; |
426 | ||
9ce5646a MD |
427 | health_code_update(); |
428 | ||
3bd1e081 MD |
429 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
430 | if (ret != sizeof(msg)) { | |
1803a064 | 431 | if (ret > 0) { |
c6857fcf | 432 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
1803a064 MD |
433 | ret = -1; |
434 | } | |
3bd1e081 MD |
435 | return ret; |
436 | } | |
9ce5646a MD |
437 | |
438 | health_code_update(); | |
439 | ||
84382d49 MD |
440 | /* Deprecated command */ |
441 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 442 | |
9ce5646a MD |
443 | health_code_update(); |
444 | ||
b0b335c8 MD |
445 | /* relayd needs RCU read-side protection */ |
446 | rcu_read_lock(); | |
447 | ||
3bd1e081 | 448 | switch (msg.cmd_type) { |
00e2e675 DG |
449 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
450 | { | |
f50f23d9 | 451 | /* Session daemon status message are handled in the following call. */ |
7735ef9e DG |
452 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
453 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, | |
d3e2ba59 JD |
454 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
455 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
456 | goto end_nosignal; |
457 | } | |
3bd1e081 MD |
458 | case LTTNG_CONSUMER_ADD_CHANNEL: |
459 | { | |
460 | struct lttng_consumer_channel *new_channel; | |
e43c41c5 | 461 | int ret_recv; |
3bd1e081 | 462 | |
9ce5646a MD |
463 | health_code_update(); |
464 | ||
f50f23d9 DG |
465 | /* First send a status message before receiving the fds. */ |
466 | ret = consumer_send_status_msg(sock, ret_code); | |
467 | if (ret < 0) { | |
468 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 469 | goto error_fatal; |
f50f23d9 | 470 | } |
9ce5646a MD |
471 | |
472 | health_code_update(); | |
473 | ||
d88aee68 | 474 | DBG("consumer_add_channel %" PRIu64, msg.u.channel.channel_key); |
3bd1e081 | 475 | new_channel = consumer_allocate_channel(msg.u.channel.channel_key, |
ffe60014 DG |
476 | msg.u.channel.session_id, msg.u.channel.pathname, |
477 | msg.u.channel.name, msg.u.channel.uid, msg.u.channel.gid, | |
1624d5b7 JD |
478 | msg.u.channel.relayd_id, msg.u.channel.output, |
479 | msg.u.channel.tracefile_size, | |
1950109e | 480 | msg.u.channel.tracefile_count, 0, |
ecc48a90 JD |
481 | msg.u.channel.monitor, |
482 | msg.u.channel.live_timer_interval); | |
3bd1e081 | 483 | if (new_channel == NULL) { |
f73fabfd | 484 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
3bd1e081 MD |
485 | goto end_nosignal; |
486 | } | |
ffe60014 | 487 | new_channel->nb_init_stream_left = msg.u.channel.nb_init_streams; |
95a1109b JD |
488 | switch (msg.u.channel.output) { |
489 | case LTTNG_EVENT_SPLICE: | |
490 | new_channel->output = CONSUMER_CHANNEL_SPLICE; | |
491 | break; | |
492 | case LTTNG_EVENT_MMAP: | |
493 | new_channel->output = CONSUMER_CHANNEL_MMAP; | |
494 | break; | |
495 | default: | |
496 | ERR("Channel output unknown %d", msg.u.channel.output); | |
497 | goto end_nosignal; | |
498 | } | |
ffe60014 DG |
499 | |
500 | /* Translate and save channel type. */ | |
501 | switch (msg.u.channel.type) { | |
502 | case CONSUMER_CHANNEL_TYPE_DATA: | |
503 | case CONSUMER_CHANNEL_TYPE_METADATA: | |
504 | new_channel->type = msg.u.channel.type; | |
505 | break; | |
506 | default: | |
507 | assert(0); | |
508 | goto end_nosignal; | |
509 | }; | |
510 | ||
9ce5646a MD |
511 | health_code_update(); |
512 | ||
3bd1e081 | 513 | if (ctx->on_recv_channel != NULL) { |
e43c41c5 JD |
514 | ret_recv = ctx->on_recv_channel(new_channel); |
515 | if (ret_recv == 0) { | |
516 | ret = consumer_add_channel(new_channel, ctx); | |
517 | } else if (ret_recv < 0) { | |
3bd1e081 MD |
518 | goto end_nosignal; |
519 | } | |
520 | } else { | |
e43c41c5 | 521 | ret = consumer_add_channel(new_channel, ctx); |
3bd1e081 | 522 | } |
94d49140 JD |
523 | if (CONSUMER_CHANNEL_TYPE_DATA) { |
524 | consumer_timer_live_start(new_channel, | |
525 | msg.u.channel.live_timer_interval); | |
526 | } | |
e43c41c5 | 527 | |
9ce5646a MD |
528 | health_code_update(); |
529 | ||
e43c41c5 | 530 | /* If we received an error in add_channel, we need to report it. */ |
821fffb2 | 531 | if (ret < 0) { |
1803a064 MD |
532 | ret = consumer_send_status_msg(sock, ret); |
533 | if (ret < 0) { | |
534 | goto error_fatal; | |
535 | } | |
e43c41c5 JD |
536 | goto end_nosignal; |
537 | } | |
538 | ||
3bd1e081 MD |
539 | goto end_nosignal; |
540 | } | |
541 | case LTTNG_CONSUMER_ADD_STREAM: | |
542 | { | |
dae10966 DG |
543 | int fd; |
544 | struct lttng_pipe *stream_pipe; | |
00e2e675 | 545 | struct lttng_consumer_stream *new_stream; |
ffe60014 | 546 | struct lttng_consumer_channel *channel; |
c80048c6 | 547 | int alloc_ret = 0; |
3bd1e081 | 548 | |
ffe60014 DG |
549 | /* |
550 | * Get stream's channel reference. Needed when adding the stream to the | |
551 | * global hash table. | |
552 | */ | |
553 | channel = consumer_find_channel(msg.u.stream.channel_key); | |
554 | if (!channel) { | |
555 | /* | |
556 | * We could not find the channel. Can happen if cpu hotplug | |
557 | * happens while tearing down. | |
558 | */ | |
d88aee68 | 559 | ERR("Unable to find channel key %" PRIu64, msg.u.stream.channel_key); |
e462382a | 560 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
ffe60014 DG |
561 | } |
562 | ||
9ce5646a MD |
563 | health_code_update(); |
564 | ||
f50f23d9 DG |
565 | /* First send a status message before receiving the fds. */ |
566 | ret = consumer_send_status_msg(sock, ret_code); | |
1803a064 | 567 | if (ret < 0) { |
d771f832 | 568 | /* Somehow, the session daemon is not responding anymore. */ |
1803a064 MD |
569 | goto error_fatal; |
570 | } | |
9ce5646a MD |
571 | |
572 | health_code_update(); | |
573 | ||
0c759fc9 | 574 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
d771f832 | 575 | /* Channel was not found. */ |
f50f23d9 DG |
576 | goto end_nosignal; |
577 | } | |
578 | ||
d771f832 | 579 | /* Blocking call */ |
9ce5646a MD |
580 | health_poll_entry(); |
581 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
582 | health_poll_exit(); | |
84382d49 MD |
583 | if (ret) { |
584 | goto error_fatal; | |
3bd1e081 | 585 | } |
00e2e675 | 586 | |
9ce5646a MD |
587 | health_code_update(); |
588 | ||
00e2e675 | 589 | /* Get stream file descriptor from socket */ |
f2fc6720 MD |
590 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); |
591 | if (ret != sizeof(fd)) { | |
f73fabfd | 592 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
3f8e211f | 593 | rcu_read_unlock(); |
3bd1e081 MD |
594 | return ret; |
595 | } | |
3bd1e081 | 596 | |
9ce5646a MD |
597 | health_code_update(); |
598 | ||
f50f23d9 DG |
599 | /* |
600 | * Send status code to session daemon only if the recv works. If the | |
601 | * above recv() failed, the session daemon is notified through the | |
602 | * error socket and the teardown is eventually done. | |
603 | */ | |
604 | ret = consumer_send_status_msg(sock, ret_code); | |
605 | if (ret < 0) { | |
606 | /* Somehow, the session daemon is not responding anymore. */ | |
607 | goto end_nosignal; | |
608 | } | |
609 | ||
9ce5646a MD |
610 | health_code_update(); |
611 | ||
ffe60014 DG |
612 | new_stream = consumer_allocate_stream(channel->key, |
613 | fd, | |
614 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
615 | channel->name, | |
616 | channel->uid, | |
617 | channel->gid, | |
618 | channel->relayd_id, | |
619 | channel->session_id, | |
620 | msg.u.stream.cpu, | |
621 | &alloc_ret, | |
4891ece8 DG |
622 | channel->type, |
623 | channel->monitor); | |
3bd1e081 | 624 | if (new_stream == NULL) { |
c80048c6 MD |
625 | switch (alloc_ret) { |
626 | case -ENOMEM: | |
627 | case -EINVAL: | |
628 | default: | |
629 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
630 | break; | |
c80048c6 | 631 | } |
3f8e211f | 632 | goto end_nosignal; |
3bd1e081 | 633 | } |
d771f832 | 634 | |
ffe60014 DG |
635 | new_stream->chan = channel; |
636 | new_stream->wait_fd = fd; | |
07b86b52 JD |
637 | switch (channel->output) { |
638 | case CONSUMER_CHANNEL_SPLICE: | |
639 | new_stream->output = LTTNG_EVENT_SPLICE; | |
6f2b2a45 JD |
640 | ret = utils_create_pipe(new_stream->splice_pipe); |
641 | if (ret < 0) { | |
642 | goto end_nosignal; | |
643 | } | |
07b86b52 JD |
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); | |
e462382a | 767 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
a4baae1b JD |
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); | |
f261ad0a | 776 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
a4baae1b JD |
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); |
e462382a | 818 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
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"); | |
e462382a | 877 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; |
07b86b52 JD |
878 | } |
879 | } else { | |
880 | ret = lttng_kconsumer_snapshot_channel(msg.u.snapshot_channel.key, | |
881 | msg.u.snapshot_channel.pathname, | |
5c786ded | 882 | msg.u.snapshot_channel.relayd_id, |
135347bd | 883 | msg.u.snapshot_channel.nb_packets_per_stream, |
5c786ded | 884 | ctx); |
07b86b52 JD |
885 | if (ret < 0) { |
886 | ERR("Snapshot channel failed"); | |
e462382a | 887 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
07b86b52 JD |
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); | |
e462382a | 908 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
07b86b52 JD |
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) { | |
5a510c9f | 1085 | PERROR("Getting sub-buffer len failed."); |
8265f19e MD |
1086 | err = kernctl_put_subbuf(infd); |
1087 | if (err != 0) { | |
1088 | if (errno == EFAULT) { | |
5a510c9f | 1089 | PERROR("Error in unreserving sub buffer\n"); |
8265f19e MD |
1090 | } else if (errno == EIO) { |
1091 | /* Should never happen with newer LTTng versions */ | |
5a510c9f | 1092 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e MD |
1093 | } |
1094 | ret = -errno; | |
1095 | goto end; | |
1096 | } | |
56591bac | 1097 | ret = -errno; |
1d4dfdef DG |
1098 | goto end; |
1099 | } | |
1100 | ||
1c20f0e2 | 1101 | if (!stream->metadata_flag) { |
309167d2 JD |
1102 | ret = get_index_values(&index, infd); |
1103 | if (ret < 0) { | |
8265f19e MD |
1104 | err = kernctl_put_subbuf(infd); |
1105 | if (err != 0) { | |
1106 | if (errno == EFAULT) { | |
5a510c9f | 1107 | PERROR("Error in unreserving sub buffer\n"); |
8265f19e MD |
1108 | } else if (errno == EIO) { |
1109 | /* Should never happen with newer LTTng versions */ | |
5a510c9f | 1110 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e MD |
1111 | } |
1112 | ret = -errno; | |
1113 | goto end; | |
1114 | } | |
309167d2 JD |
1115 | goto end; |
1116 | } | |
1c20f0e2 JD |
1117 | } else { |
1118 | write_index = 0; | |
309167d2 JD |
1119 | } |
1120 | ||
ffe60014 | 1121 | switch (stream->chan->output) { |
07b86b52 | 1122 | case CONSUMER_CHANNEL_SPLICE: |
1d4dfdef DG |
1123 | /* |
1124 | * XXX: The lttng-modules splice "actor" does not handle copying | |
1125 | * partial pages hence only using the subbuffer size without the | |
1126 | * padding makes the splice fail. | |
1127 | */ | |
1128 | subbuf_size = len; | |
1129 | padding = 0; | |
1130 | ||
1131 | /* splice the subbuffer to the tracefile */ | |
91dfef6e | 1132 | ret = lttng_consumer_on_read_subbuffer_splice(ctx, stream, subbuf_size, |
309167d2 | 1133 | padding, &index); |
91dfef6e DG |
1134 | /* |
1135 | * XXX: Splice does not support network streaming so the return value | |
1136 | * is simply checked against subbuf_size and not like the mmap() op. | |
1137 | */ | |
1d4dfdef DG |
1138 | if (ret != subbuf_size) { |
1139 | /* | |
1140 | * display the error but continue processing to try | |
1141 | * to release the subbuffer | |
1142 | */ | |
1143 | ERR("Error splicing to tracefile (ret: %zd != len: %lu)", | |
1144 | ret, subbuf_size); | |
309167d2 | 1145 | write_index = 0; |
1d4dfdef DG |
1146 | } |
1147 | break; | |
07b86b52 | 1148 | case CONSUMER_CHANNEL_MMAP: |
1d4dfdef DG |
1149 | /* Get subbuffer size without padding */ |
1150 | err = kernctl_get_subbuf_size(infd, &subbuf_size); | |
1151 | if (err != 0) { | |
5a510c9f | 1152 | PERROR("Getting sub-buffer len failed."); |
8265f19e MD |
1153 | err = kernctl_put_subbuf(infd); |
1154 | if (err != 0) { | |
1155 | if (errno == EFAULT) { | |
5a510c9f | 1156 | PERROR("Error in unreserving sub buffer\n"); |
8265f19e MD |
1157 | } else if (errno == EIO) { |
1158 | /* Should never happen with newer LTTng versions */ | |
5a510c9f | 1159 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e MD |
1160 | } |
1161 | ret = -errno; | |
1162 | goto end; | |
1163 | } | |
56591bac | 1164 | ret = -errno; |
1d4dfdef DG |
1165 | goto end; |
1166 | } | |
47e81c02 | 1167 | |
1d4dfdef DG |
1168 | /* Make sure the tracer is not gone mad on us! */ |
1169 | assert(len >= subbuf_size); | |
1170 | ||
1171 | padding = len - subbuf_size; | |
1172 | ||
1173 | /* write the subbuffer to the tracefile */ | |
91dfef6e | 1174 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, |
309167d2 | 1175 | padding, &index); |
91dfef6e DG |
1176 | /* |
1177 | * The mmap operation should write subbuf_size amount of data when | |
1178 | * network streaming or the full padding (len) size when we are _not_ | |
1179 | * streaming. | |
1180 | */ | |
d88aee68 DG |
1181 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
1182 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
1d4dfdef | 1183 | /* |
91dfef6e | 1184 | * Display the error but continue processing to try to release the |
2336629e DG |
1185 | * subbuffer. This is a DBG statement since this is possible to |
1186 | * happen without being a critical error. | |
1d4dfdef | 1187 | */ |
2336629e | 1188 | DBG("Error writing to tracefile " |
91dfef6e DG |
1189 | "(ret: %zd != len: %lu != subbuf_size: %lu)", |
1190 | ret, len, subbuf_size); | |
309167d2 | 1191 | write_index = 0; |
1d4dfdef DG |
1192 | } |
1193 | break; | |
1194 | default: | |
1195 | ERR("Unknown output method"); | |
56591bac | 1196 | ret = -EPERM; |
d41f73b7 MD |
1197 | } |
1198 | ||
1199 | err = kernctl_put_next_subbuf(infd); | |
1200 | if (err != 0) { | |
d41f73b7 | 1201 | if (errno == EFAULT) { |
5a510c9f | 1202 | PERROR("Error in unreserving sub buffer\n"); |
d41f73b7 MD |
1203 | } else if (errno == EIO) { |
1204 | /* Should never happen with newer LTTng versions */ | |
5a510c9f | 1205 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
d41f73b7 | 1206 | } |
56591bac | 1207 | ret = -errno; |
d41f73b7 MD |
1208 | goto end; |
1209 | } | |
1210 | ||
309167d2 | 1211 | /* Write index if needed. */ |
1c20f0e2 JD |
1212 | if (!write_index) { |
1213 | goto end; | |
1214 | } | |
1215 | ||
94d49140 JD |
1216 | if (stream->chan->live_timer_interval && !stream->metadata_flag) { |
1217 | /* | |
1218 | * In live, block until all the metadata is sent. | |
1219 | */ | |
5cc6b3e4 MD |
1220 | pthread_mutex_lock(&stream->metadata_timer_lock); |
1221 | assert(!stream->missed_metadata_flush); | |
1222 | stream->waiting_on_metadata = true; | |
1223 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1224 | ||
94d49140 | 1225 | err = consumer_stream_sync_metadata(ctx, stream->session_id); |
5cc6b3e4 MD |
1226 | |
1227 | pthread_mutex_lock(&stream->metadata_timer_lock); | |
1228 | stream->waiting_on_metadata = false; | |
1229 | if (stream->missed_metadata_flush) { | |
1230 | stream->missed_metadata_flush = false; | |
1231 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1232 | (void) consumer_flush_kernel_index(stream); | |
1233 | } else { | |
1234 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1235 | } | |
94d49140 JD |
1236 | if (err < 0) { |
1237 | goto end; | |
1238 | } | |
1239 | } | |
1240 | ||
1c20f0e2 JD |
1241 | err = consumer_stream_write_index(stream, &index); |
1242 | if (err < 0) { | |
1243 | goto end; | |
309167d2 JD |
1244 | } |
1245 | ||
d41f73b7 MD |
1246 | end: |
1247 | return ret; | |
1248 | } | |
1249 | ||
1250 | int lttng_kconsumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
1251 | { | |
1252 | int ret; | |
ffe60014 DG |
1253 | |
1254 | assert(stream); | |
1255 | ||
2bba9e53 DG |
1256 | /* |
1257 | * Don't create anything if this is set for streaming or should not be | |
1258 | * monitored. | |
1259 | */ | |
1260 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { | |
fe4477ee JD |
1261 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
1262 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
309167d2 | 1263 | stream->uid, stream->gid, NULL); |
fe4477ee JD |
1264 | if (ret < 0) { |
1265 | goto error; | |
1266 | } | |
1267 | stream->out_fd = ret; | |
1268 | stream->tracefile_size_current = 0; | |
309167d2 JD |
1269 | |
1270 | if (!stream->metadata_flag) { | |
1271 | ret = index_create_file(stream->chan->pathname, | |
1272 | stream->name, stream->uid, stream->gid, | |
1273 | stream->chan->tracefile_size, | |
1274 | stream->tracefile_count_current); | |
1275 | if (ret < 0) { | |
1276 | goto error; | |
1277 | } | |
1278 | stream->index_fd = ret; | |
1279 | } | |
ffe60014 | 1280 | } |
d41f73b7 | 1281 | |
d41f73b7 MD |
1282 | if (stream->output == LTTNG_EVENT_MMAP) { |
1283 | /* get the len of the mmap region */ | |
1284 | unsigned long mmap_len; | |
1285 | ||
1286 | ret = kernctl_get_mmap_len(stream->wait_fd, &mmap_len); | |
1287 | if (ret != 0) { | |
ffe60014 | 1288 | PERROR("kernctl_get_mmap_len"); |
56591bac | 1289 | ret = -errno; |
d41f73b7 MD |
1290 | goto error_close_fd; |
1291 | } | |
1292 | stream->mmap_len = (size_t) mmap_len; | |
1293 | ||
ffe60014 DG |
1294 | stream->mmap_base = mmap(NULL, stream->mmap_len, PROT_READ, |
1295 | MAP_PRIVATE, stream->wait_fd, 0); | |
d41f73b7 | 1296 | if (stream->mmap_base == MAP_FAILED) { |
ffe60014 | 1297 | PERROR("Error mmaping"); |
d41f73b7 MD |
1298 | ret = -1; |
1299 | goto error_close_fd; | |
1300 | } | |
1301 | } | |
1302 | ||
1303 | /* we return 0 to let the library handle the FD internally */ | |
1304 | return 0; | |
1305 | ||
1306 | error_close_fd: | |
2f225ce2 | 1307 | if (stream->out_fd >= 0) { |
d41f73b7 MD |
1308 | int err; |
1309 | ||
1310 | err = close(stream->out_fd); | |
1311 | assert(!err); | |
2f225ce2 | 1312 | stream->out_fd = -1; |
d41f73b7 MD |
1313 | } |
1314 | error: | |
1315 | return ret; | |
1316 | } | |
1317 | ||
ca22feea DG |
1318 | /* |
1319 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
1320 | * stream. Consumer data lock MUST be acquired before calling this function |
1321 | * and the stream lock. | |
ca22feea | 1322 | * |
6d805429 | 1323 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
1324 | * data is available for trace viewer reading. |
1325 | */ | |
6d805429 | 1326 | int lttng_kconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
1327 | { |
1328 | int ret; | |
1329 | ||
1330 | assert(stream); | |
1331 | ||
873b9e9a MD |
1332 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
1333 | ret = 0; | |
1334 | goto end; | |
1335 | } | |
1336 | ||
ca22feea DG |
1337 | ret = kernctl_get_next_subbuf(stream->wait_fd); |
1338 | if (ret == 0) { | |
1339 | /* There is still data so let's put back this subbuffer. */ | |
1340 | ret = kernctl_put_subbuf(stream->wait_fd); | |
1341 | assert(ret == 0); | |
6d805429 | 1342 | ret = 1; /* Data is pending */ |
4e9a4686 | 1343 | goto end; |
ca22feea DG |
1344 | } |
1345 | ||
6d805429 DG |
1346 | /* Data is NOT pending and ready to be read. */ |
1347 | ret = 0; | |
ca22feea | 1348 | |
6efae65e DG |
1349 | end: |
1350 | return ret; | |
ca22feea | 1351 | } |