Commit | Line | Data |
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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 | |
990570ed | 32 | #include <common/common.h> |
10a8a223 | 33 | #include <common/kernel-ctl/kernel-ctl.h> |
10a8a223 | 34 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 35 | #include <common/sessiond-comm/relayd.h> |
dbb5dfe6 | 36 | #include <common/compat/fcntl.h> |
acdb9057 | 37 | #include <common/pipe.h> |
00e2e675 | 38 | #include <common/relayd/relayd.h> |
fe4477ee | 39 | #include <common/utils.h> |
07b86b52 | 40 | #include <common/consumer-stream.h> |
0857097f | 41 | |
10a8a223 | 42 | #include "kernel-consumer.h" |
3bd1e081 MD |
43 | |
44 | extern struct lttng_consumer_global_data consumer_data; | |
45 | extern int consumer_poll_timeout; | |
46 | extern volatile int consumer_quit; | |
47 | ||
3bd1e081 MD |
48 | /* |
49 | * Take a snapshot for a specific fd | |
50 | * | |
51 | * Returns 0 on success, < 0 on error | |
52 | */ | |
ffe60014 | 53 | int lttng_kconsumer_take_snapshot(struct lttng_consumer_stream *stream) |
3bd1e081 MD |
54 | { |
55 | int ret = 0; | |
56 | int infd = stream->wait_fd; | |
57 | ||
58 | ret = kernctl_snapshot(infd); | |
59 | if (ret != 0) { | |
87dc6a9c | 60 | errno = -ret; |
3bd1e081 MD |
61 | perror("Getting sub-buffer snapshot."); |
62 | } | |
63 | ||
64 | return ret; | |
65 | } | |
66 | ||
67 | /* | |
68 | * Get the produced position | |
69 | * | |
70 | * Returns 0 on success, < 0 on error | |
71 | */ | |
ffe60014 | 72 | int lttng_kconsumer_get_produced_snapshot(struct lttng_consumer_stream *stream, |
3bd1e081 MD |
73 | unsigned long *pos) |
74 | { | |
75 | int ret; | |
76 | int infd = stream->wait_fd; | |
77 | ||
78 | ret = kernctl_snapshot_get_produced(infd, pos); | |
79 | if (ret != 0) { | |
87dc6a9c | 80 | errno = -ret; |
3bd1e081 MD |
81 | perror("kernctl_snapshot_get_produced"); |
82 | } | |
83 | ||
84 | return ret; | |
85 | } | |
86 | ||
07b86b52 JD |
87 | /* |
88 | * Get the consumerd position | |
89 | * | |
90 | * Returns 0 on success, < 0 on error | |
91 | */ | |
92 | int lttng_kconsumer_get_consumed_snapshot(struct lttng_consumer_stream *stream, | |
93 | unsigned long *pos) | |
94 | { | |
95 | int ret; | |
96 | int infd = stream->wait_fd; | |
97 | ||
98 | ret = kernctl_snapshot_get_consumed(infd, pos); | |
99 | if (ret != 0) { | |
100 | errno = -ret; | |
101 | perror("kernctl_snapshot_get_consumed"); | |
102 | } | |
103 | ||
104 | return ret; | |
105 | } | |
106 | ||
07b86b52 JD |
107 | /* |
108 | * Take a snapshot of all the stream of a channel | |
109 | * | |
110 | * Returns 0 on success, < 0 on error | |
111 | */ | |
112 | int lttng_kconsumer_snapshot_channel(uint64_t key, char *path, | |
113 | uint64_t relayd_id, struct lttng_consumer_local_data *ctx) | |
114 | { | |
115 | int ret; | |
116 | unsigned long consumed_pos, produced_pos; | |
117 | struct lttng_consumer_channel *channel; | |
118 | struct lttng_consumer_stream *stream; | |
119 | ||
120 | DBG("Kernel consumer snapshot channel %lu", key); | |
121 | ||
122 | rcu_read_lock(); | |
123 | ||
124 | channel = consumer_find_channel(key); | |
125 | if (!channel) { | |
126 | ERR("No channel found for key %lu", key); | |
127 | ret = -1; | |
128 | goto end; | |
129 | } | |
130 | ||
131 | /* Splice is not supported yet for channel snapshot. */ | |
132 | if (channel->output != CONSUMER_CHANNEL_MMAP) { | |
133 | ERR("Unsupported output %d", channel->output); | |
134 | ret = -1; | |
135 | goto end; | |
136 | } | |
137 | ||
10a50311 | 138 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { |
07b86b52 JD |
139 | /* |
140 | * Lock stream because we are about to change its state. | |
141 | */ | |
142 | pthread_mutex_lock(&stream->lock); | |
143 | ||
29decac3 DG |
144 | /* |
145 | * Assign the received relayd ID so we can use it for streaming. The streams | |
146 | * are not visible to anyone so this is OK to change it. | |
147 | */ | |
07b86b52 JD |
148 | stream->net_seq_idx = relayd_id; |
149 | channel->relayd_id = relayd_id; | |
150 | if (relayd_id != (uint64_t) -1ULL) { | |
10a50311 | 151 | ret = consumer_send_relayd_stream(stream, path); |
07b86b52 JD |
152 | if (ret < 0) { |
153 | ERR("sending stream to relayd"); | |
154 | goto end_unlock; | |
155 | } | |
07b86b52 JD |
156 | } else { |
157 | ret = utils_create_stream_file(path, stream->name, | |
10a50311 JD |
158 | stream->chan->tracefile_size, |
159 | stream->tracefile_count_current, | |
07b86b52 JD |
160 | stream->uid, stream->gid); |
161 | if (ret < 0) { | |
162 | ERR("utils_create_stream_file"); | |
163 | goto end_unlock; | |
164 | } | |
165 | ||
166 | stream->out_fd = ret; | |
167 | stream->tracefile_size_current = 0; | |
168 | ||
169 | DBG("Kernel consumer snapshot stream %s/%s (%lu)", path, | |
170 | stream->name, stream->key); | |
171 | } | |
172 | ||
173 | ret = kernctl_buffer_flush(stream->wait_fd); | |
174 | if (ret < 0) { | |
10a50311 | 175 | ERR("Failed to flush kernel stream"); |
07b86b52 JD |
176 | goto end_unlock; |
177 | } | |
178 | ||
179 | ret = lttng_kconsumer_take_snapshot(stream); | |
180 | if (ret < 0) { | |
181 | ERR("Taking kernel snapshot"); | |
182 | goto end_unlock; | |
183 | } | |
184 | ||
185 | ret = lttng_kconsumer_get_produced_snapshot(stream, &produced_pos); | |
186 | if (ret < 0) { | |
187 | ERR("Produced kernel snapshot position"); | |
188 | goto end_unlock; | |
189 | } | |
190 | ||
191 | ret = lttng_kconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
192 | if (ret < 0) { | |
193 | ERR("Consumerd kernel snapshot position"); | |
194 | goto end_unlock; | |
195 | } | |
196 | ||
197 | if (stream->max_sb_size == 0) { | |
198 | ret = kernctl_get_max_subbuf_size(stream->wait_fd, | |
199 | &stream->max_sb_size); | |
200 | if (ret < 0) { | |
201 | ERR("Getting kernel max_sb_size"); | |
202 | goto end_unlock; | |
203 | } | |
204 | } | |
205 | ||
206 | while (consumed_pos < produced_pos) { | |
207 | ssize_t read_len; | |
208 | unsigned long len, padded_len; | |
209 | ||
210 | DBG("Kernel consumer taking snapshot at pos %lu", consumed_pos); | |
211 | ||
212 | ret = kernctl_get_subbuf(stream->wait_fd, &consumed_pos); | |
213 | if (ret < 0) { | |
214 | if (errno != EAGAIN) { | |
215 | PERROR("kernctl_get_subbuf snapshot"); | |
216 | goto end_unlock; | |
217 | } | |
218 | DBG("Kernel consumer get subbuf failed. Skipping it."); | |
219 | consumed_pos += stream->max_sb_size; | |
220 | continue; | |
221 | } | |
222 | ||
223 | ret = kernctl_get_subbuf_size(stream->wait_fd, &len); | |
224 | if (ret < 0) { | |
225 | ERR("Snapshot kernctl_get_subbuf_size"); | |
29decac3 | 226 | goto error_put_subbuf; |
07b86b52 JD |
227 | } |
228 | ||
229 | ret = kernctl_get_padded_subbuf_size(stream->wait_fd, &padded_len); | |
230 | if (ret < 0) { | |
231 | ERR("Snapshot kernctl_get_padded_subbuf_size"); | |
29decac3 | 232 | goto error_put_subbuf; |
07b86b52 JD |
233 | } |
234 | ||
235 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
236 | padded_len - len); | |
237 | /* | |
29decac3 DG |
238 | * We write the padded len in local tracefiles but the data len |
239 | * when using a relay. Display the error but continue processing | |
240 | * to try to release the subbuffer. | |
07b86b52 JD |
241 | */ |
242 | if (relayd_id != (uint64_t) -1ULL) { | |
243 | if (read_len != len) { | |
244 | ERR("Error sending to the relay (ret: %zd != len: %lu)", | |
245 | read_len, len); | |
246 | } | |
247 | } else { | |
248 | if (read_len != padded_len) { | |
249 | ERR("Error writing to tracefile (ret: %zd != len: %lu)", | |
250 | read_len, padded_len); | |
251 | } | |
252 | } | |
253 | ||
254 | ret = kernctl_put_subbuf(stream->wait_fd); | |
255 | if (ret < 0) { | |
256 | ERR("Snapshot kernctl_put_subbuf"); | |
257 | goto end_unlock; | |
258 | } | |
259 | consumed_pos += stream->max_sb_size; | |
260 | } | |
261 | ||
262 | if (relayd_id == (uint64_t) -1ULL) { | |
263 | ret = close(stream->out_fd); | |
264 | if (ret < 0) { | |
265 | PERROR("Kernel consumer snapshot close out_fd"); | |
266 | goto end_unlock; | |
267 | } | |
268 | stream->out_fd = -1; | |
269 | } else { | |
270 | close_relayd_stream(stream); | |
271 | stream->net_seq_idx = (uint64_t) -1ULL; | |
272 | } | |
273 | pthread_mutex_unlock(&stream->lock); | |
274 | } | |
275 | ||
276 | /* All good! */ | |
277 | ret = 0; | |
278 | goto end; | |
279 | ||
29decac3 DG |
280 | error_put_subbuf: |
281 | ret = kernctl_put_subbuf(stream->wait_fd); | |
282 | if (ret < 0) { | |
283 | ERR("Snapshot kernctl_put_subbuf error path"); | |
284 | } | |
07b86b52 JD |
285 | end_unlock: |
286 | pthread_mutex_unlock(&stream->lock); | |
287 | end: | |
288 | rcu_read_unlock(); | |
289 | return ret; | |
290 | } | |
291 | ||
292 | /* | |
293 | * Read the whole metadata available for a snapshot. | |
294 | * | |
295 | * Returns 0 on success, < 0 on error | |
296 | */ | |
297 | int lttng_kconsumer_snapshot_metadata(uint64_t key, char *path, | |
e2039c7a | 298 | uint64_t relayd_id, struct lttng_consumer_local_data *ctx) |
07b86b52 | 299 | { |
d771f832 DG |
300 | int ret, use_relayd = 0; |
301 | ssize_t ret_read; | |
07b86b52 JD |
302 | struct lttng_consumer_channel *metadata_channel; |
303 | struct lttng_consumer_stream *metadata_stream; | |
d771f832 DG |
304 | |
305 | assert(ctx); | |
07b86b52 JD |
306 | |
307 | DBG("Kernel consumer snapshot metadata with key %" PRIu64 " at path %s", | |
308 | key, path); | |
309 | ||
310 | rcu_read_lock(); | |
311 | ||
312 | metadata_channel = consumer_find_channel(key); | |
313 | if (!metadata_channel) { | |
d771f832 | 314 | ERR("Kernel snapshot metadata not found for key %" PRIu64, key); |
07b86b52 | 315 | ret = -1; |
d771f832 | 316 | goto error; |
07b86b52 JD |
317 | } |
318 | ||
319 | metadata_stream = metadata_channel->metadata_stream; | |
320 | assert(metadata_stream); | |
321 | ||
d771f832 | 322 | /* Flag once that we have a valid relayd for the stream. */ |
e2039c7a | 323 | if (relayd_id != (uint64_t) -1ULL) { |
d771f832 DG |
324 | use_relayd = 1; |
325 | } | |
326 | ||
327 | if (use_relayd) { | |
10a50311 | 328 | ret = consumer_send_relayd_stream(metadata_stream, path); |
e2039c7a | 329 | if (ret < 0) { |
d771f832 | 330 | goto error; |
e2039c7a | 331 | } |
e2039c7a JD |
332 | } else { |
333 | ret = utils_create_stream_file(path, metadata_stream->name, | |
334 | metadata_stream->chan->tracefile_size, | |
335 | metadata_stream->tracefile_count_current, | |
336 | metadata_stream->uid, metadata_stream->gid); | |
337 | if (ret < 0) { | |
d771f832 | 338 | goto error; |
e2039c7a JD |
339 | } |
340 | metadata_stream->out_fd = ret; | |
07b86b52 | 341 | } |
07b86b52 | 342 | |
d771f832 DG |
343 | do { |
344 | ret_read = lttng_kconsumer_read_subbuffer(metadata_stream, ctx); | |
345 | if (ret_read < 0) { | |
346 | if (ret_read != -EPERM) { | |
347 | ERR("Kernel snapshot reading metadata subbuffer (ret: %ld)", | |
348 | ret_read); | |
349 | goto error; | |
07b86b52 | 350 | } |
d771f832 | 351 | /* ret_read is negative at this point so we will exit the loop. */ |
07b86b52 JD |
352 | continue; |
353 | } | |
d771f832 | 354 | } while (ret_read >= 0); |
07b86b52 | 355 | |
d771f832 DG |
356 | if (use_relayd) { |
357 | close_relayd_stream(metadata_stream); | |
358 | metadata_stream->net_seq_idx = (uint64_t) -1ULL; | |
359 | } else { | |
e2039c7a JD |
360 | ret = close(metadata_stream->out_fd); |
361 | if (ret < 0) { | |
d771f832 DG |
362 | PERROR("Kernel consumer snapshot metadata close out_fd"); |
363 | /* | |
364 | * Don't go on error here since the snapshot was successful at this | |
365 | * point but somehow the close failed. | |
366 | */ | |
e2039c7a JD |
367 | } |
368 | metadata_stream->out_fd = -1; | |
e2039c7a JD |
369 | } |
370 | ||
07b86b52 | 371 | ret = 0; |
d771f832 | 372 | |
cf53a8a6 JD |
373 | cds_list_del(&metadata_stream->send_node); |
374 | consumer_stream_destroy(metadata_stream, NULL); | |
375 | metadata_channel->metadata_stream = NULL; | |
d771f832 | 376 | error: |
07b86b52 JD |
377 | rcu_read_unlock(); |
378 | return ret; | |
379 | } | |
380 | ||
1803a064 MD |
381 | /* |
382 | * Receive command from session daemon and process it. | |
383 | * | |
384 | * Return 1 on success else a negative value or 0. | |
385 | */ | |
3bd1e081 MD |
386 | int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
387 | int sock, struct pollfd *consumer_sockpoll) | |
388 | { | |
389 | ssize_t ret; | |
f50f23d9 | 390 | enum lttng_error_code ret_code = LTTNG_OK; |
3bd1e081 MD |
391 | struct lttcomm_consumer_msg msg; |
392 | ||
393 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); | |
394 | if (ret != sizeof(msg)) { | |
f73fabfd | 395 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
1803a064 MD |
396 | if (ret > 0) { |
397 | ret = -1; | |
398 | } | |
3bd1e081 MD |
399 | return ret; |
400 | } | |
401 | if (msg.cmd_type == LTTNG_CONSUMER_STOP) { | |
f50f23d9 DG |
402 | /* |
403 | * Notify the session daemon that the command is completed. | |
404 | * | |
405 | * On transport layer error, the function call will print an error | |
406 | * message so handling the returned code is a bit useless since we | |
407 | * return an error code anyway. | |
408 | */ | |
409 | (void) consumer_send_status_msg(sock, ret_code); | |
3bd1e081 MD |
410 | return -ENOENT; |
411 | } | |
412 | ||
b0b335c8 MD |
413 | /* relayd needs RCU read-side protection */ |
414 | rcu_read_lock(); | |
415 | ||
3bd1e081 | 416 | switch (msg.cmd_type) { |
00e2e675 DG |
417 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
418 | { | |
f50f23d9 | 419 | /* Session daemon status message are handled in the following call. */ |
7735ef9e DG |
420 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
421 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, | |
46e6455f | 422 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id); |
00e2e675 DG |
423 | goto end_nosignal; |
424 | } | |
3bd1e081 MD |
425 | case LTTNG_CONSUMER_ADD_CHANNEL: |
426 | { | |
427 | struct lttng_consumer_channel *new_channel; | |
e43c41c5 | 428 | int ret_recv; |
3bd1e081 | 429 | |
f50f23d9 DG |
430 | /* First send a status message before receiving the fds. */ |
431 | ret = consumer_send_status_msg(sock, ret_code); | |
432 | if (ret < 0) { | |
433 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 434 | goto error_fatal; |
f50f23d9 | 435 | } |
d88aee68 | 436 | DBG("consumer_add_channel %" PRIu64, msg.u.channel.channel_key); |
3bd1e081 | 437 | new_channel = consumer_allocate_channel(msg.u.channel.channel_key, |
ffe60014 DG |
438 | msg.u.channel.session_id, msg.u.channel.pathname, |
439 | msg.u.channel.name, msg.u.channel.uid, msg.u.channel.gid, | |
1624d5b7 JD |
440 | msg.u.channel.relayd_id, msg.u.channel.output, |
441 | msg.u.channel.tracefile_size, | |
1950109e | 442 | msg.u.channel.tracefile_count, 0, |
2bba9e53 | 443 | msg.u.channel.monitor); |
3bd1e081 | 444 | if (new_channel == NULL) { |
f73fabfd | 445 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
3bd1e081 MD |
446 | goto end_nosignal; |
447 | } | |
ffe60014 | 448 | new_channel->nb_init_stream_left = msg.u.channel.nb_init_streams; |
95a1109b JD |
449 | switch (msg.u.channel.output) { |
450 | case LTTNG_EVENT_SPLICE: | |
451 | new_channel->output = CONSUMER_CHANNEL_SPLICE; | |
452 | break; | |
453 | case LTTNG_EVENT_MMAP: | |
454 | new_channel->output = CONSUMER_CHANNEL_MMAP; | |
455 | break; | |
456 | default: | |
457 | ERR("Channel output unknown %d", msg.u.channel.output); | |
458 | goto end_nosignal; | |
459 | } | |
ffe60014 DG |
460 | |
461 | /* Translate and save channel type. */ | |
462 | switch (msg.u.channel.type) { | |
463 | case CONSUMER_CHANNEL_TYPE_DATA: | |
464 | case CONSUMER_CHANNEL_TYPE_METADATA: | |
465 | new_channel->type = msg.u.channel.type; | |
466 | break; | |
467 | default: | |
468 | assert(0); | |
469 | goto end_nosignal; | |
470 | }; | |
471 | ||
3bd1e081 | 472 | if (ctx->on_recv_channel != NULL) { |
e43c41c5 JD |
473 | ret_recv = ctx->on_recv_channel(new_channel); |
474 | if (ret_recv == 0) { | |
475 | ret = consumer_add_channel(new_channel, ctx); | |
476 | } else if (ret_recv < 0) { | |
3bd1e081 MD |
477 | goto end_nosignal; |
478 | } | |
479 | } else { | |
e43c41c5 | 480 | ret = consumer_add_channel(new_channel, ctx); |
3bd1e081 | 481 | } |
e43c41c5 JD |
482 | |
483 | /* If we received an error in add_channel, we need to report it. */ | |
821fffb2 | 484 | if (ret < 0) { |
1803a064 MD |
485 | ret = consumer_send_status_msg(sock, ret); |
486 | if (ret < 0) { | |
487 | goto error_fatal; | |
488 | } | |
e43c41c5 JD |
489 | goto end_nosignal; |
490 | } | |
491 | ||
3bd1e081 MD |
492 | goto end_nosignal; |
493 | } | |
494 | case LTTNG_CONSUMER_ADD_STREAM: | |
495 | { | |
dae10966 DG |
496 | int fd; |
497 | struct lttng_pipe *stream_pipe; | |
00e2e675 | 498 | struct lttng_consumer_stream *new_stream; |
ffe60014 | 499 | struct lttng_consumer_channel *channel; |
c80048c6 | 500 | int alloc_ret = 0; |
3bd1e081 | 501 | |
ffe60014 DG |
502 | /* |
503 | * Get stream's channel reference. Needed when adding the stream to the | |
504 | * global hash table. | |
505 | */ | |
506 | channel = consumer_find_channel(msg.u.stream.channel_key); | |
507 | if (!channel) { | |
508 | /* | |
509 | * We could not find the channel. Can happen if cpu hotplug | |
510 | * happens while tearing down. | |
511 | */ | |
d88aee68 | 512 | ERR("Unable to find channel key %" PRIu64, msg.u.stream.channel_key); |
ffe60014 DG |
513 | ret_code = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
514 | } | |
515 | ||
f50f23d9 DG |
516 | /* First send a status message before receiving the fds. */ |
517 | ret = consumer_send_status_msg(sock, ret_code); | |
1803a064 | 518 | if (ret < 0) { |
d771f832 | 519 | /* Somehow, the session daemon is not responding anymore. */ |
1803a064 MD |
520 | goto error_fatal; |
521 | } | |
522 | if (ret_code != LTTNG_OK) { | |
d771f832 | 523 | /* Channel was not found. */ |
f50f23d9 DG |
524 | goto end_nosignal; |
525 | } | |
526 | ||
d771f832 | 527 | /* Blocking call */ |
3bd1e081 | 528 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { |
3f8e211f | 529 | rcu_read_unlock(); |
3bd1e081 MD |
530 | return -EINTR; |
531 | } | |
00e2e675 DG |
532 | |
533 | /* Get stream file descriptor from socket */ | |
f2fc6720 MD |
534 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); |
535 | if (ret != sizeof(fd)) { | |
f73fabfd | 536 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
3f8e211f | 537 | rcu_read_unlock(); |
3bd1e081 MD |
538 | return ret; |
539 | } | |
3bd1e081 | 540 | |
f50f23d9 DG |
541 | /* |
542 | * Send status code to session daemon only if the recv works. If the | |
543 | * above recv() failed, the session daemon is notified through the | |
544 | * error socket and the teardown is eventually done. | |
545 | */ | |
546 | ret = consumer_send_status_msg(sock, ret_code); | |
547 | if (ret < 0) { | |
548 | /* Somehow, the session daemon is not responding anymore. */ | |
549 | goto end_nosignal; | |
550 | } | |
551 | ||
ffe60014 DG |
552 | new_stream = consumer_allocate_stream(channel->key, |
553 | fd, | |
554 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
555 | channel->name, | |
556 | channel->uid, | |
557 | channel->gid, | |
558 | channel->relayd_id, | |
559 | channel->session_id, | |
560 | msg.u.stream.cpu, | |
561 | &alloc_ret, | |
562 | channel->type); | |
3bd1e081 | 563 | if (new_stream == NULL) { |
c80048c6 MD |
564 | switch (alloc_ret) { |
565 | case -ENOMEM: | |
566 | case -EINVAL: | |
567 | default: | |
568 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
569 | break; | |
c80048c6 | 570 | } |
3f8e211f | 571 | goto end_nosignal; |
3bd1e081 | 572 | } |
d771f832 | 573 | |
ffe60014 DG |
574 | new_stream->chan = channel; |
575 | new_stream->wait_fd = fd; | |
07b86b52 JD |
576 | switch (channel->output) { |
577 | case CONSUMER_CHANNEL_SPLICE: | |
578 | new_stream->output = LTTNG_EVENT_SPLICE; | |
579 | break; | |
580 | case CONSUMER_CHANNEL_MMAP: | |
581 | new_stream->output = LTTNG_EVENT_MMAP; | |
582 | break; | |
583 | default: | |
584 | ERR("Stream output unknown %d", channel->output); | |
585 | goto end_nosignal; | |
586 | } | |
00e2e675 | 587 | |
a0c83db9 DG |
588 | /* |
589 | * We've just assigned the channel to the stream so increment the | |
07b86b52 JD |
590 | * refcount right now. We don't need to increment the refcount for |
591 | * streams in no monitor because we handle manually the cleanup of | |
592 | * those. It is very important to make sure there is NO prior | |
593 | * consumer_del_stream() calls or else the refcount will be unbalanced. | |
a0c83db9 | 594 | */ |
07b86b52 JD |
595 | if (channel->monitor) { |
596 | uatomic_inc(&new_stream->chan->refcount); | |
597 | } | |
9d9353f9 | 598 | |
fb3a43a9 DG |
599 | /* |
600 | * The buffer flush is done on the session daemon side for the kernel | |
601 | * so no need for the stream "hangup_flush_done" variable to be | |
602 | * tracked. This is important for a kernel stream since we don't rely | |
603 | * on the flush state of the stream to read data. It's not the case for | |
604 | * user space tracing. | |
605 | */ | |
606 | new_stream->hangup_flush_done = 0; | |
607 | ||
633d0084 DG |
608 | if (ctx->on_recv_stream) { |
609 | ret = ctx->on_recv_stream(new_stream); | |
610 | if (ret < 0) { | |
d771f832 | 611 | consumer_stream_free(new_stream); |
633d0084 | 612 | goto end_nosignal; |
fb3a43a9 | 613 | } |
633d0084 | 614 | } |
fb3a43a9 | 615 | |
07b86b52 JD |
616 | if (new_stream->metadata_flag) { |
617 | channel->metadata_stream = new_stream; | |
618 | } | |
619 | ||
2bba9e53 DG |
620 | /* Do not monitor this stream. */ |
621 | if (!channel->monitor) { | |
5eecee74 | 622 | DBG("Kernel consumer add stream %s in no monitor mode with " |
6dc3064a | 623 | "relayd id %" PRIu64, new_stream->name, |
5eecee74 | 624 | new_stream->net_seq_idx); |
10a50311 | 625 | cds_list_add(&new_stream->send_node, &channel->streams.head); |
6dc3064a DG |
626 | break; |
627 | } | |
628 | ||
e1b71bdc DG |
629 | /* Send stream to relayd if the stream has an ID. */ |
630 | if (new_stream->net_seq_idx != (uint64_t) -1ULL) { | |
631 | ret = consumer_send_relayd_stream(new_stream, NULL); | |
632 | if (ret < 0) { | |
633 | consumer_stream_free(new_stream); | |
634 | goto end_nosignal; | |
635 | } | |
e2039c7a JD |
636 | } |
637 | ||
50f8ae69 | 638 | /* Get the right pipe where the stream will be sent. */ |
633d0084 | 639 | if (new_stream->metadata_flag) { |
dae10966 | 640 | stream_pipe = ctx->consumer_metadata_pipe; |
3bd1e081 | 641 | } else { |
dae10966 | 642 | stream_pipe = ctx->consumer_data_pipe; |
50f8ae69 DG |
643 | } |
644 | ||
dae10966 | 645 | ret = lttng_pipe_write(stream_pipe, &new_stream, sizeof(new_stream)); |
50f8ae69 | 646 | if (ret < 0) { |
dae10966 | 647 | ERR("Consumer write %s stream to pipe %d", |
50f8ae69 | 648 | new_stream->metadata_flag ? "metadata" : "data", |
dae10966 | 649 | lttng_pipe_get_writefd(stream_pipe)); |
d771f832 | 650 | consumer_stream_free(new_stream); |
50f8ae69 | 651 | goto end_nosignal; |
3bd1e081 | 652 | } |
00e2e675 | 653 | |
50f8ae69 | 654 | DBG("Kernel consumer ADD_STREAM %s (fd: %d) with relayd id %" PRIu64, |
ffe60014 | 655 | new_stream->name, fd, new_stream->relayd_stream_id); |
3bd1e081 MD |
656 | break; |
657 | } | |
658 | case LTTNG_CONSUMER_UPDATE_STREAM: | |
659 | { | |
3f8e211f DG |
660 | rcu_read_unlock(); |
661 | return -ENOSYS; | |
662 | } | |
663 | case LTTNG_CONSUMER_DESTROY_RELAYD: | |
664 | { | |
a6ba4fe1 | 665 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
3f8e211f DG |
666 | struct consumer_relayd_sock_pair *relayd; |
667 | ||
a6ba4fe1 | 668 | DBG("Kernel consumer destroying relayd %" PRIu64, index); |
3f8e211f DG |
669 | |
670 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 671 | relayd = consumer_find_relayd(index); |
3f8e211f | 672 | if (relayd == NULL) { |
3448e266 | 673 | DBG("Unable to find relayd %" PRIu64, index); |
f50f23d9 | 674 | ret_code = LTTNG_ERR_NO_CONSUMER; |
3bd1e081 | 675 | } |
3f8e211f | 676 | |
a6ba4fe1 DG |
677 | /* |
678 | * Each relayd socket pair has a refcount of stream attached to it | |
679 | * which tells if the relayd is still active or not depending on the | |
680 | * refcount value. | |
681 | * | |
682 | * This will set the destroy flag of the relayd object and destroy it | |
683 | * if the refcount reaches zero when called. | |
684 | * | |
685 | * The destroy can happen either here or when a stream fd hangs up. | |
686 | */ | |
f50f23d9 DG |
687 | if (relayd) { |
688 | consumer_flag_relayd_for_destroy(relayd); | |
689 | } | |
690 | ||
691 | ret = consumer_send_status_msg(sock, ret_code); | |
692 | if (ret < 0) { | |
693 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 694 | goto error_fatal; |
f50f23d9 | 695 | } |
3f8e211f | 696 | |
3f8e211f | 697 | goto end_nosignal; |
3bd1e081 | 698 | } |
6d805429 | 699 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 700 | { |
c8f59ee5 | 701 | int32_t ret; |
6d805429 | 702 | uint64_t id = msg.u.data_pending.session_id; |
c8f59ee5 | 703 | |
6d805429 | 704 | DBG("Kernel consumer data pending command for id %" PRIu64, id); |
c8f59ee5 | 705 | |
6d805429 | 706 | ret = consumer_data_pending(id); |
c8f59ee5 DG |
707 | |
708 | /* Send back returned value to session daemon */ | |
709 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
710 | if (ret < 0) { | |
6d805429 | 711 | PERROR("send data pending ret code"); |
1803a064 | 712 | goto error_fatal; |
c8f59ee5 | 713 | } |
f50f23d9 DG |
714 | |
715 | /* | |
716 | * No need to send back a status message since the data pending | |
717 | * returned value is the response. | |
718 | */ | |
c8f59ee5 | 719 | break; |
53632229 | 720 | } |
6dc3064a DG |
721 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
722 | { | |
07b86b52 JD |
723 | if (msg.u.snapshot_channel.metadata == 1) { |
724 | ret = lttng_kconsumer_snapshot_metadata(msg.u.snapshot_channel.key, | |
e2039c7a JD |
725 | msg.u.snapshot_channel.pathname, |
726 | msg.u.snapshot_channel.relayd_id, ctx); | |
07b86b52 JD |
727 | if (ret < 0) { |
728 | ERR("Snapshot metadata failed"); | |
729 | ret_code = LTTNG_ERR_KERN_META_FAIL; | |
730 | } | |
731 | } else { | |
732 | ret = lttng_kconsumer_snapshot_channel(msg.u.snapshot_channel.key, | |
733 | msg.u.snapshot_channel.pathname, | |
734 | msg.u.snapshot_channel.relayd_id, ctx); | |
735 | if (ret < 0) { | |
736 | ERR("Snapshot channel failed"); | |
737 | ret_code = LTTNG_ERR_KERN_CHAN_FAIL; | |
738 | } | |
739 | } | |
740 | ||
6dc3064a DG |
741 | ret = consumer_send_status_msg(sock, ret_code); |
742 | if (ret < 0) { | |
743 | /* Somehow, the session daemon is not responding anymore. */ | |
744 | goto end_nosignal; | |
745 | } | |
746 | break; | |
747 | } | |
07b86b52 JD |
748 | case LTTNG_CONSUMER_DESTROY_CHANNEL: |
749 | { | |
750 | uint64_t key = msg.u.destroy_channel.key; | |
751 | struct lttng_consumer_channel *channel; | |
752 | ||
753 | channel = consumer_find_channel(key); | |
754 | if (!channel) { | |
755 | ERR("Kernel consumer destroy channel %" PRIu64 " not found", key); | |
756 | ret_code = LTTNG_ERR_KERN_CHAN_NOT_FOUND; | |
757 | } | |
758 | ||
759 | ret = consumer_send_status_msg(sock, ret_code); | |
760 | if (ret < 0) { | |
761 | /* Somehow, the session daemon is not responding anymore. */ | |
762 | goto end_nosignal; | |
763 | } | |
764 | ||
765 | /* | |
766 | * This command should ONLY be issued for channel with streams set in | |
767 | * no monitor mode. | |
768 | */ | |
769 | assert(!channel->monitor); | |
770 | ||
771 | /* | |
772 | * The refcount should ALWAYS be 0 in the case of a channel in no | |
773 | * monitor mode. | |
774 | */ | |
775 | assert(!uatomic_sub_return(&channel->refcount, 1)); | |
776 | ||
777 | consumer_del_channel(channel); | |
778 | ||
779 | goto end_nosignal; | |
780 | } | |
3bd1e081 | 781 | default: |
3f8e211f | 782 | goto end_nosignal; |
3bd1e081 | 783 | } |
3f8e211f | 784 | |
3bd1e081 | 785 | end_nosignal: |
b0b335c8 | 786 | rcu_read_unlock(); |
4cbc1a04 DG |
787 | |
788 | /* | |
789 | * Return 1 to indicate success since the 0 value can be a socket | |
790 | * shutdown during the recv() or send() call. | |
791 | */ | |
792 | return 1; | |
1803a064 MD |
793 | |
794 | error_fatal: | |
795 | rcu_read_unlock(); | |
796 | /* This will issue a consumer stop. */ | |
797 | return -1; | |
3bd1e081 | 798 | } |
d41f73b7 MD |
799 | |
800 | /* | |
801 | * Consume data on a file descriptor and write it on a trace file. | |
802 | */ | |
4078b776 | 803 | ssize_t lttng_kconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
804 | struct lttng_consumer_local_data *ctx) |
805 | { | |
1d4dfdef | 806 | unsigned long len, subbuf_size, padding; |
d41f73b7 | 807 | int err; |
4078b776 | 808 | ssize_t ret = 0; |
d41f73b7 MD |
809 | int infd = stream->wait_fd; |
810 | ||
811 | DBG("In read_subbuffer (infd : %d)", infd); | |
812 | /* Get the next subbuffer */ | |
813 | err = kernctl_get_next_subbuf(infd); | |
814 | if (err != 0) { | |
1d4dfdef | 815 | ret = err; |
d41f73b7 MD |
816 | /* |
817 | * This is a debug message even for single-threaded consumer, | |
818 | * because poll() have more relaxed criterions than get subbuf, | |
819 | * so get_subbuf may fail for short race windows where poll() | |
820 | * would issue wakeups. | |
821 | */ | |
822 | DBG("Reserving sub buffer failed (everything is normal, " | |
823 | "it is due to concurrency)"); | |
824 | goto end; | |
825 | } | |
826 | ||
1d4dfdef DG |
827 | /* Get the full subbuffer size including padding */ |
828 | err = kernctl_get_padded_subbuf_size(infd, &len); | |
829 | if (err != 0) { | |
830 | errno = -err; | |
831 | perror("Getting sub-buffer len failed."); | |
832 | ret = err; | |
833 | goto end; | |
834 | } | |
835 | ||
ffe60014 | 836 | switch (stream->chan->output) { |
07b86b52 | 837 | case CONSUMER_CHANNEL_SPLICE: |
1d4dfdef DG |
838 | /* |
839 | * XXX: The lttng-modules splice "actor" does not handle copying | |
840 | * partial pages hence only using the subbuffer size without the | |
841 | * padding makes the splice fail. | |
842 | */ | |
843 | subbuf_size = len; | |
844 | padding = 0; | |
845 | ||
846 | /* splice the subbuffer to the tracefile */ | |
91dfef6e DG |
847 | ret = lttng_consumer_on_read_subbuffer_splice(ctx, stream, subbuf_size, |
848 | padding); | |
849 | /* | |
850 | * XXX: Splice does not support network streaming so the return value | |
851 | * is simply checked against subbuf_size and not like the mmap() op. | |
852 | */ | |
1d4dfdef DG |
853 | if (ret != subbuf_size) { |
854 | /* | |
855 | * display the error but continue processing to try | |
856 | * to release the subbuffer | |
857 | */ | |
858 | ERR("Error splicing to tracefile (ret: %zd != len: %lu)", | |
859 | ret, subbuf_size); | |
860 | } | |
861 | break; | |
07b86b52 | 862 | case CONSUMER_CHANNEL_MMAP: |
1d4dfdef DG |
863 | /* Get subbuffer size without padding */ |
864 | err = kernctl_get_subbuf_size(infd, &subbuf_size); | |
865 | if (err != 0) { | |
866 | errno = -err; | |
867 | perror("Getting sub-buffer len failed."); | |
868 | ret = err; | |
869 | goto end; | |
870 | } | |
47e81c02 | 871 | |
1d4dfdef DG |
872 | /* Make sure the tracer is not gone mad on us! */ |
873 | assert(len >= subbuf_size); | |
874 | ||
875 | padding = len - subbuf_size; | |
876 | ||
877 | /* write the subbuffer to the tracefile */ | |
91dfef6e DG |
878 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, |
879 | padding); | |
880 | /* | |
881 | * The mmap operation should write subbuf_size amount of data when | |
882 | * network streaming or the full padding (len) size when we are _not_ | |
883 | * streaming. | |
884 | */ | |
d88aee68 DG |
885 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
886 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
1d4dfdef | 887 | /* |
91dfef6e DG |
888 | * Display the error but continue processing to try to release the |
889 | * subbuffer | |
1d4dfdef | 890 | */ |
91dfef6e DG |
891 | ERR("Error writing to tracefile " |
892 | "(ret: %zd != len: %lu != subbuf_size: %lu)", | |
893 | ret, len, subbuf_size); | |
1d4dfdef DG |
894 | } |
895 | break; | |
896 | default: | |
897 | ERR("Unknown output method"); | |
898 | ret = -1; | |
d41f73b7 MD |
899 | } |
900 | ||
901 | err = kernctl_put_next_subbuf(infd); | |
902 | if (err != 0) { | |
21073eaa | 903 | errno = -err; |
d41f73b7 MD |
904 | if (errno == EFAULT) { |
905 | perror("Error in unreserving sub buffer\n"); | |
906 | } else if (errno == EIO) { | |
907 | /* Should never happen with newer LTTng versions */ | |
908 | perror("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
909 | } | |
21073eaa DG |
910 | |
911 | ret = -err; | |
d41f73b7 MD |
912 | goto end; |
913 | } | |
914 | ||
915 | end: | |
916 | return ret; | |
917 | } | |
918 | ||
919 | int lttng_kconsumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
920 | { | |
921 | int ret; | |
ffe60014 DG |
922 | |
923 | assert(stream); | |
924 | ||
2bba9e53 DG |
925 | /* |
926 | * Don't create anything if this is set for streaming or should not be | |
927 | * monitored. | |
928 | */ | |
929 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { | |
fe4477ee JD |
930 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
931 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
932 | stream->uid, stream->gid); | |
933 | if (ret < 0) { | |
934 | goto error; | |
935 | } | |
936 | stream->out_fd = ret; | |
937 | stream->tracefile_size_current = 0; | |
ffe60014 | 938 | } |
d41f73b7 | 939 | |
d41f73b7 MD |
940 | if (stream->output == LTTNG_EVENT_MMAP) { |
941 | /* get the len of the mmap region */ | |
942 | unsigned long mmap_len; | |
943 | ||
944 | ret = kernctl_get_mmap_len(stream->wait_fd, &mmap_len); | |
945 | if (ret != 0) { | |
87dc6a9c | 946 | errno = -ret; |
ffe60014 | 947 | PERROR("kernctl_get_mmap_len"); |
d41f73b7 MD |
948 | goto error_close_fd; |
949 | } | |
950 | stream->mmap_len = (size_t) mmap_len; | |
951 | ||
ffe60014 DG |
952 | stream->mmap_base = mmap(NULL, stream->mmap_len, PROT_READ, |
953 | MAP_PRIVATE, stream->wait_fd, 0); | |
d41f73b7 | 954 | if (stream->mmap_base == MAP_FAILED) { |
ffe60014 | 955 | PERROR("Error mmaping"); |
d41f73b7 MD |
956 | ret = -1; |
957 | goto error_close_fd; | |
958 | } | |
959 | } | |
960 | ||
961 | /* we return 0 to let the library handle the FD internally */ | |
962 | return 0; | |
963 | ||
964 | error_close_fd: | |
2f225ce2 | 965 | if (stream->out_fd >= 0) { |
d41f73b7 MD |
966 | int err; |
967 | ||
968 | err = close(stream->out_fd); | |
969 | assert(!err); | |
2f225ce2 | 970 | stream->out_fd = -1; |
d41f73b7 MD |
971 | } |
972 | error: | |
973 | return ret; | |
974 | } | |
975 | ||
ca22feea DG |
976 | /* |
977 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
978 | * stream. Consumer data lock MUST be acquired before calling this function |
979 | * and the stream lock. | |
ca22feea | 980 | * |
6d805429 | 981 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
982 | * data is available for trace viewer reading. |
983 | */ | |
6d805429 | 984 | int lttng_kconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
985 | { |
986 | int ret; | |
987 | ||
988 | assert(stream); | |
989 | ||
ca22feea DG |
990 | ret = kernctl_get_next_subbuf(stream->wait_fd); |
991 | if (ret == 0) { | |
992 | /* There is still data so let's put back this subbuffer. */ | |
993 | ret = kernctl_put_subbuf(stream->wait_fd); | |
994 | assert(ret == 0); | |
6d805429 | 995 | ret = 1; /* Data is pending */ |
4e9a4686 | 996 | goto end; |
ca22feea DG |
997 | } |
998 | ||
6d805429 DG |
999 | /* Data is NOT pending and ready to be read. */ |
1000 | ret = 0; | |
ca22feea | 1001 | |
6efae65e DG |
1002 | end: |
1003 | return ret; | |
ca22feea | 1004 | } |