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 | |
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 | ||
107 | /* | |
108 | * Find a relayd and send the stream | |
109 | * | |
110 | * Returns 0 on success, < 0 on error | |
111 | */ | |
41ad7012 DG |
112 | static int send_relayd_stream(struct lttng_consumer_stream *stream, |
113 | char *path) | |
07b86b52 | 114 | { |
07b86b52 | 115 | int ret = 0; |
41ad7012 DG |
116 | const char *stream_path; |
117 | struct consumer_relayd_sock_pair *relayd; | |
118 | ||
119 | assert(stream); | |
120 | assert(stream->net_seq_idx != -1ULL); | |
07b86b52 JD |
121 | |
122 | if (path != NULL) { | |
123 | stream_path = path; | |
124 | } else { | |
125 | stream_path = stream->chan->pathname; | |
126 | } | |
41ad7012 | 127 | |
07b86b52 JD |
128 | /* The stream is not metadata. Get relayd reference if exists. */ |
129 | rcu_read_lock(); | |
130 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
131 | if (relayd != NULL) { | |
132 | /* Add stream on the relayd */ | |
133 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
41ad7012 DG |
134 | ret = relayd_add_stream(&relayd->control_sock, stream->name, |
135 | stream_path, &stream->relayd_stream_id, | |
136 | stream->chan->tracefile_size, stream->chan->tracefile_count); | |
07b86b52 JD |
137 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); |
138 | if (ret < 0) { | |
139 | goto end; | |
140 | } | |
141 | uatomic_inc(&relayd->refcount); | |
41ad7012 DG |
142 | } else { |
143 | ERR("Stream %" PRIu64 " relayd ID %" PRIu64 " unknown. Can't send it.", | |
144 | stream->key, stream->net_seq_idx); | |
07b86b52 JD |
145 | ret = -1; |
146 | goto end; | |
147 | } | |
148 | ||
41ad7012 DG |
149 | DBG("Stream %s with key %" PRIu64 " sent to relayd id %" PRIu64, |
150 | stream->name, stream->key, stream->net_seq_idx); | |
151 | ||
07b86b52 JD |
152 | end: |
153 | rcu_read_unlock(); | |
154 | return ret; | |
155 | } | |
156 | ||
157 | /* | |
158 | * Find a relayd and close the stream | |
159 | */ | |
41ad7012 | 160 | static void close_relayd_stream(struct lttng_consumer_stream *stream) |
07b86b52 JD |
161 | { |
162 | struct consumer_relayd_sock_pair *relayd; | |
163 | ||
164 | /* The stream is not metadata. Get relayd reference if exists. */ | |
165 | rcu_read_lock(); | |
166 | relayd = consumer_find_relayd(stream->net_seq_idx); | |
41ad7012 | 167 | if (relayd) { |
07b86b52 JD |
168 | consumer_stream_relayd_close(stream, relayd); |
169 | } | |
170 | rcu_read_unlock(); | |
171 | } | |
172 | ||
173 | /* | |
174 | * Take a snapshot of all the stream of a channel | |
175 | * | |
176 | * Returns 0 on success, < 0 on error | |
177 | */ | |
178 | int lttng_kconsumer_snapshot_channel(uint64_t key, char *path, | |
179 | uint64_t relayd_id, struct lttng_consumer_local_data *ctx) | |
180 | { | |
181 | int ret; | |
182 | unsigned long consumed_pos, produced_pos; | |
183 | struct lttng_consumer_channel *channel; | |
184 | struct lttng_consumer_stream *stream; | |
185 | ||
186 | DBG("Kernel consumer snapshot channel %lu", key); | |
187 | ||
188 | rcu_read_lock(); | |
189 | ||
190 | channel = consumer_find_channel(key); | |
191 | if (!channel) { | |
192 | ERR("No channel found for key %lu", key); | |
193 | ret = -1; | |
194 | goto end; | |
195 | } | |
196 | ||
197 | /* Splice is not supported yet for channel snapshot. */ | |
198 | if (channel->output != CONSUMER_CHANNEL_MMAP) { | |
199 | ERR("Unsupported output %d", channel->output); | |
200 | ret = -1; | |
201 | goto end; | |
202 | } | |
203 | ||
204 | cds_list_for_each_entry(stream, &channel->stream_no_monitor_list.head, | |
205 | no_monitor_node) { | |
206 | /* | |
207 | * Lock stream because we are about to change its state. | |
208 | */ | |
209 | pthread_mutex_lock(&stream->lock); | |
210 | ||
29decac3 DG |
211 | /* |
212 | * Assign the received relayd ID so we can use it for streaming. The streams | |
213 | * are not visible to anyone so this is OK to change it. | |
214 | */ | |
07b86b52 JD |
215 | stream->net_seq_idx = relayd_id; |
216 | channel->relayd_id = relayd_id; | |
217 | if (relayd_id != (uint64_t) -1ULL) { | |
218 | ret = send_relayd_stream(stream, path); | |
219 | if (ret < 0) { | |
220 | ERR("sending stream to relayd"); | |
221 | goto end_unlock; | |
222 | } | |
07b86b52 JD |
223 | } else { |
224 | ret = utils_create_stream_file(path, stream->name, | |
225 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
226 | stream->uid, stream->gid); | |
227 | if (ret < 0) { | |
228 | ERR("utils_create_stream_file"); | |
229 | goto end_unlock; | |
230 | } | |
231 | ||
232 | stream->out_fd = ret; | |
233 | stream->tracefile_size_current = 0; | |
234 | ||
235 | DBG("Kernel consumer snapshot stream %s/%s (%lu)", path, | |
236 | stream->name, stream->key); | |
237 | } | |
238 | ||
239 | ret = kernctl_buffer_flush(stream->wait_fd); | |
240 | if (ret < 0) { | |
241 | ERR("Failed to flush kernel metadata stream"); | |
242 | goto end_unlock; | |
243 | } | |
244 | ||
245 | ret = lttng_kconsumer_take_snapshot(stream); | |
246 | if (ret < 0) { | |
247 | ERR("Taking kernel snapshot"); | |
248 | goto end_unlock; | |
249 | } | |
250 | ||
251 | ret = lttng_kconsumer_get_produced_snapshot(stream, &produced_pos); | |
252 | if (ret < 0) { | |
253 | ERR("Produced kernel snapshot position"); | |
254 | goto end_unlock; | |
255 | } | |
256 | ||
257 | ret = lttng_kconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
258 | if (ret < 0) { | |
259 | ERR("Consumerd kernel snapshot position"); | |
260 | goto end_unlock; | |
261 | } | |
262 | ||
263 | if (stream->max_sb_size == 0) { | |
264 | ret = kernctl_get_max_subbuf_size(stream->wait_fd, | |
265 | &stream->max_sb_size); | |
266 | if (ret < 0) { | |
267 | ERR("Getting kernel max_sb_size"); | |
268 | goto end_unlock; | |
269 | } | |
270 | } | |
271 | ||
272 | while (consumed_pos < produced_pos) { | |
273 | ssize_t read_len; | |
274 | unsigned long len, padded_len; | |
275 | ||
276 | DBG("Kernel consumer taking snapshot at pos %lu", consumed_pos); | |
277 | ||
278 | ret = kernctl_get_subbuf(stream->wait_fd, &consumed_pos); | |
279 | if (ret < 0) { | |
280 | if (errno != EAGAIN) { | |
281 | PERROR("kernctl_get_subbuf snapshot"); | |
282 | goto end_unlock; | |
283 | } | |
284 | DBG("Kernel consumer get subbuf failed. Skipping it."); | |
285 | consumed_pos += stream->max_sb_size; | |
286 | continue; | |
287 | } | |
288 | ||
289 | ret = kernctl_get_subbuf_size(stream->wait_fd, &len); | |
290 | if (ret < 0) { | |
291 | ERR("Snapshot kernctl_get_subbuf_size"); | |
29decac3 | 292 | goto error_put_subbuf; |
07b86b52 JD |
293 | } |
294 | ||
295 | ret = kernctl_get_padded_subbuf_size(stream->wait_fd, &padded_len); | |
296 | if (ret < 0) { | |
297 | ERR("Snapshot kernctl_get_padded_subbuf_size"); | |
29decac3 | 298 | goto error_put_subbuf; |
07b86b52 JD |
299 | } |
300 | ||
301 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
302 | padded_len - len); | |
303 | /* | |
29decac3 DG |
304 | * We write the padded len in local tracefiles but the data len |
305 | * when using a relay. Display the error but continue processing | |
306 | * to try to release the subbuffer. | |
07b86b52 JD |
307 | */ |
308 | if (relayd_id != (uint64_t) -1ULL) { | |
309 | if (read_len != len) { | |
310 | ERR("Error sending to the relay (ret: %zd != len: %lu)", | |
311 | read_len, len); | |
312 | } | |
313 | } else { | |
314 | if (read_len != padded_len) { | |
315 | ERR("Error writing to tracefile (ret: %zd != len: %lu)", | |
316 | read_len, padded_len); | |
317 | } | |
318 | } | |
319 | ||
320 | ret = kernctl_put_subbuf(stream->wait_fd); | |
321 | if (ret < 0) { | |
322 | ERR("Snapshot kernctl_put_subbuf"); | |
323 | goto end_unlock; | |
324 | } | |
325 | consumed_pos += stream->max_sb_size; | |
326 | } | |
327 | ||
328 | if (relayd_id == (uint64_t) -1ULL) { | |
329 | ret = close(stream->out_fd); | |
330 | if (ret < 0) { | |
331 | PERROR("Kernel consumer snapshot close out_fd"); | |
332 | goto end_unlock; | |
333 | } | |
334 | stream->out_fd = -1; | |
335 | } else { | |
336 | close_relayd_stream(stream); | |
337 | stream->net_seq_idx = (uint64_t) -1ULL; | |
338 | } | |
339 | pthread_mutex_unlock(&stream->lock); | |
340 | } | |
341 | ||
342 | /* All good! */ | |
343 | ret = 0; | |
344 | goto end; | |
345 | ||
29decac3 DG |
346 | error_put_subbuf: |
347 | ret = kernctl_put_subbuf(stream->wait_fd); | |
348 | if (ret < 0) { | |
349 | ERR("Snapshot kernctl_put_subbuf error path"); | |
350 | } | |
07b86b52 JD |
351 | end_unlock: |
352 | pthread_mutex_unlock(&stream->lock); | |
353 | end: | |
354 | rcu_read_unlock(); | |
355 | return ret; | |
356 | } | |
357 | ||
358 | /* | |
359 | * Read the whole metadata available for a snapshot. | |
360 | * | |
361 | * Returns 0 on success, < 0 on error | |
362 | */ | |
363 | int lttng_kconsumer_snapshot_metadata(uint64_t key, char *path, | |
e2039c7a | 364 | uint64_t relayd_id, struct lttng_consumer_local_data *ctx) |
07b86b52 JD |
365 | { |
366 | struct lttng_consumer_channel *metadata_channel; | |
367 | struct lttng_consumer_stream *metadata_stream; | |
368 | int ret; | |
369 | ||
370 | DBG("Kernel consumer snapshot metadata with key %" PRIu64 " at path %s", | |
371 | key, path); | |
372 | ||
373 | rcu_read_lock(); | |
374 | ||
375 | metadata_channel = consumer_find_channel(key); | |
376 | if (!metadata_channel) { | |
377 | ERR("Snapshot kernel metadata channel not found for key %lu", key); | |
378 | ret = -1; | |
379 | goto end; | |
380 | } | |
381 | ||
382 | metadata_stream = metadata_channel->metadata_stream; | |
383 | assert(metadata_stream); | |
384 | ||
e2039c7a JD |
385 | if (relayd_id != (uint64_t) -1ULL) { |
386 | ret = send_relayd_stream(metadata_stream, path); | |
387 | if (ret < 0) { | |
388 | ERR("sending stream to relayd"); | |
389 | } | |
390 | DBG("Stream %s sent to the relayd", metadata_stream->name); | |
391 | } else { | |
392 | ret = utils_create_stream_file(path, metadata_stream->name, | |
393 | metadata_stream->chan->tracefile_size, | |
394 | metadata_stream->tracefile_count_current, | |
395 | metadata_stream->uid, metadata_stream->gid); | |
396 | if (ret < 0) { | |
397 | goto end; | |
398 | } | |
399 | metadata_stream->out_fd = ret; | |
07b86b52 | 400 | } |
07b86b52 JD |
401 | |
402 | ret = 0; | |
403 | while (ret >= 0) { | |
404 | ret = lttng_kconsumer_read_subbuffer(metadata_stream, ctx); | |
405 | if (ret < 0) { | |
406 | if (ret != -EPERM) { | |
407 | ERR("Kernel snapshot reading subbuffer"); | |
408 | goto end; | |
409 | } | |
410 | /* "ret" is negative at this point so we will exit the loop. */ | |
411 | continue; | |
412 | } | |
413 | } | |
414 | ||
e2039c7a JD |
415 | if (relayd_id == (uint64_t) -1ULL) { |
416 | ret = close(metadata_stream->out_fd); | |
417 | if (ret < 0) { | |
418 | PERROR("Kernel consumer snapshot close out_fd"); | |
419 | goto end; | |
420 | } | |
421 | metadata_stream->out_fd = -1; | |
422 | } else { | |
423 | close_relayd_stream(metadata_stream); | |
424 | metadata_stream->net_seq_idx = (uint64_t) -1ULL; | |
425 | } | |
426 | ||
07b86b52 JD |
427 | ret = 0; |
428 | end: | |
429 | rcu_read_unlock(); | |
430 | return ret; | |
431 | } | |
432 | ||
1803a064 MD |
433 | /* |
434 | * Receive command from session daemon and process it. | |
435 | * | |
436 | * Return 1 on success else a negative value or 0. | |
437 | */ | |
3bd1e081 MD |
438 | int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
439 | int sock, struct pollfd *consumer_sockpoll) | |
440 | { | |
441 | ssize_t ret; | |
f50f23d9 | 442 | enum lttng_error_code ret_code = LTTNG_OK; |
3bd1e081 MD |
443 | struct lttcomm_consumer_msg msg; |
444 | ||
445 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); | |
446 | if (ret != sizeof(msg)) { | |
f73fabfd | 447 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
1803a064 MD |
448 | if (ret > 0) { |
449 | ret = -1; | |
450 | } | |
3bd1e081 MD |
451 | return ret; |
452 | } | |
453 | if (msg.cmd_type == LTTNG_CONSUMER_STOP) { | |
f50f23d9 DG |
454 | /* |
455 | * Notify the session daemon that the command is completed. | |
456 | * | |
457 | * On transport layer error, the function call will print an error | |
458 | * message so handling the returned code is a bit useless since we | |
459 | * return an error code anyway. | |
460 | */ | |
461 | (void) consumer_send_status_msg(sock, ret_code); | |
3bd1e081 MD |
462 | return -ENOENT; |
463 | } | |
464 | ||
b0b335c8 MD |
465 | /* relayd needs RCU read-side protection */ |
466 | rcu_read_lock(); | |
467 | ||
3bd1e081 | 468 | switch (msg.cmd_type) { |
00e2e675 DG |
469 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
470 | { | |
f50f23d9 | 471 | /* Session daemon status message are handled in the following call. */ |
7735ef9e DG |
472 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
473 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, | |
46e6455f | 474 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id); |
00e2e675 DG |
475 | goto end_nosignal; |
476 | } | |
3bd1e081 MD |
477 | case LTTNG_CONSUMER_ADD_CHANNEL: |
478 | { | |
479 | struct lttng_consumer_channel *new_channel; | |
e43c41c5 | 480 | int ret_recv; |
3bd1e081 | 481 | |
f50f23d9 DG |
482 | /* First send a status message before receiving the fds. */ |
483 | ret = consumer_send_status_msg(sock, ret_code); | |
484 | if (ret < 0) { | |
485 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 486 | goto error_fatal; |
f50f23d9 | 487 | } |
d88aee68 | 488 | DBG("consumer_add_channel %" PRIu64, msg.u.channel.channel_key); |
3bd1e081 | 489 | new_channel = consumer_allocate_channel(msg.u.channel.channel_key, |
ffe60014 DG |
490 | msg.u.channel.session_id, msg.u.channel.pathname, |
491 | msg.u.channel.name, msg.u.channel.uid, msg.u.channel.gid, | |
1624d5b7 JD |
492 | msg.u.channel.relayd_id, msg.u.channel.output, |
493 | msg.u.channel.tracefile_size, | |
1950109e | 494 | msg.u.channel.tracefile_count, 0, |
2bba9e53 | 495 | msg.u.channel.monitor); |
3bd1e081 | 496 | if (new_channel == NULL) { |
f73fabfd | 497 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
3bd1e081 MD |
498 | goto end_nosignal; |
499 | } | |
ffe60014 | 500 | new_channel->nb_init_stream_left = msg.u.channel.nb_init_streams; |
95a1109b JD |
501 | switch (msg.u.channel.output) { |
502 | case LTTNG_EVENT_SPLICE: | |
503 | new_channel->output = CONSUMER_CHANNEL_SPLICE; | |
504 | break; | |
505 | case LTTNG_EVENT_MMAP: | |
506 | new_channel->output = CONSUMER_CHANNEL_MMAP; | |
507 | break; | |
508 | default: | |
509 | ERR("Channel output unknown %d", msg.u.channel.output); | |
510 | goto end_nosignal; | |
511 | } | |
ffe60014 DG |
512 | |
513 | /* Translate and save channel type. */ | |
514 | switch (msg.u.channel.type) { | |
515 | case CONSUMER_CHANNEL_TYPE_DATA: | |
516 | case CONSUMER_CHANNEL_TYPE_METADATA: | |
517 | new_channel->type = msg.u.channel.type; | |
518 | break; | |
519 | default: | |
520 | assert(0); | |
521 | goto end_nosignal; | |
522 | }; | |
523 | ||
3bd1e081 | 524 | if (ctx->on_recv_channel != NULL) { |
e43c41c5 JD |
525 | ret_recv = ctx->on_recv_channel(new_channel); |
526 | if (ret_recv == 0) { | |
527 | ret = consumer_add_channel(new_channel, ctx); | |
528 | } else if (ret_recv < 0) { | |
3bd1e081 MD |
529 | goto end_nosignal; |
530 | } | |
531 | } else { | |
e43c41c5 | 532 | ret = consumer_add_channel(new_channel, ctx); |
3bd1e081 | 533 | } |
e43c41c5 JD |
534 | |
535 | /* If we received an error in add_channel, we need to report it. */ | |
821fffb2 | 536 | if (ret < 0) { |
1803a064 MD |
537 | ret = consumer_send_status_msg(sock, ret); |
538 | if (ret < 0) { | |
539 | goto error_fatal; | |
540 | } | |
e43c41c5 JD |
541 | goto end_nosignal; |
542 | } | |
543 | ||
3bd1e081 MD |
544 | goto end_nosignal; |
545 | } | |
546 | case LTTNG_CONSUMER_ADD_STREAM: | |
547 | { | |
dae10966 DG |
548 | int fd; |
549 | struct lttng_pipe *stream_pipe; | |
00e2e675 | 550 | struct lttng_consumer_stream *new_stream; |
ffe60014 | 551 | struct lttng_consumer_channel *channel; |
c80048c6 | 552 | int alloc_ret = 0; |
3bd1e081 | 553 | |
ffe60014 DG |
554 | /* |
555 | * Get stream's channel reference. Needed when adding the stream to the | |
556 | * global hash table. | |
557 | */ | |
558 | channel = consumer_find_channel(msg.u.stream.channel_key); | |
559 | if (!channel) { | |
560 | /* | |
561 | * We could not find the channel. Can happen if cpu hotplug | |
562 | * happens while tearing down. | |
563 | */ | |
d88aee68 | 564 | ERR("Unable to find channel key %" PRIu64, msg.u.stream.channel_key); |
ffe60014 DG |
565 | ret_code = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
566 | } | |
567 | ||
f50f23d9 DG |
568 | /* First send a status message before receiving the fds. */ |
569 | ret = consumer_send_status_msg(sock, ret_code); | |
1803a064 MD |
570 | if (ret < 0) { |
571 | /* | |
572 | * Somehow, the session daemon is not responding | |
573 | * anymore. | |
574 | */ | |
575 | goto error_fatal; | |
576 | } | |
577 | if (ret_code != LTTNG_OK) { | |
ffe60014 | 578 | /* |
1803a064 | 579 | * Channel was not found. |
ffe60014 | 580 | */ |
f50f23d9 DG |
581 | goto end_nosignal; |
582 | } | |
583 | ||
3bd1e081 MD |
584 | /* block */ |
585 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
3f8e211f | 586 | rcu_read_unlock(); |
3bd1e081 MD |
587 | return -EINTR; |
588 | } | |
00e2e675 DG |
589 | |
590 | /* Get stream file descriptor from socket */ | |
f2fc6720 MD |
591 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); |
592 | if (ret != sizeof(fd)) { | |
f73fabfd | 593 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
3f8e211f | 594 | rcu_read_unlock(); |
3bd1e081 MD |
595 | return ret; |
596 | } | |
3bd1e081 | 597 | |
f50f23d9 DG |
598 | /* |
599 | * Send status code to session daemon only if the recv works. If the | |
600 | * above recv() failed, the session daemon is notified through the | |
601 | * error socket and the teardown is eventually done. | |
602 | */ | |
603 | ret = consumer_send_status_msg(sock, ret_code); | |
604 | if (ret < 0) { | |
605 | /* Somehow, the session daemon is not responding anymore. */ | |
606 | goto end_nosignal; | |
607 | } | |
608 | ||
ffe60014 DG |
609 | new_stream = consumer_allocate_stream(channel->key, |
610 | fd, | |
611 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
612 | channel->name, | |
613 | channel->uid, | |
614 | channel->gid, | |
615 | channel->relayd_id, | |
616 | channel->session_id, | |
617 | msg.u.stream.cpu, | |
618 | &alloc_ret, | |
619 | channel->type); | |
3bd1e081 | 620 | if (new_stream == NULL) { |
c80048c6 MD |
621 | switch (alloc_ret) { |
622 | case -ENOMEM: | |
623 | case -EINVAL: | |
624 | default: | |
625 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
626 | break; | |
c80048c6 | 627 | } |
3f8e211f | 628 | goto end_nosignal; |
3bd1e081 | 629 | } |
ffe60014 DG |
630 | new_stream->chan = channel; |
631 | new_stream->wait_fd = fd; | |
07b86b52 JD |
632 | switch (channel->output) { |
633 | case CONSUMER_CHANNEL_SPLICE: | |
634 | new_stream->output = LTTNG_EVENT_SPLICE; | |
635 | break; | |
636 | case CONSUMER_CHANNEL_MMAP: | |
637 | new_stream->output = LTTNG_EVENT_MMAP; | |
638 | break; | |
639 | default: | |
640 | ERR("Stream output unknown %d", channel->output); | |
641 | goto end_nosignal; | |
642 | } | |
00e2e675 | 643 | |
a0c83db9 DG |
644 | /* |
645 | * We've just assigned the channel to the stream so increment the | |
07b86b52 JD |
646 | * refcount right now. We don't need to increment the refcount for |
647 | * streams in no monitor because we handle manually the cleanup of | |
648 | * those. It is very important to make sure there is NO prior | |
649 | * consumer_del_stream() calls or else the refcount will be unbalanced. | |
a0c83db9 | 650 | */ |
07b86b52 JD |
651 | if (channel->monitor) { |
652 | uatomic_inc(&new_stream->chan->refcount); | |
653 | } | |
9d9353f9 | 654 | |
fb3a43a9 DG |
655 | /* |
656 | * The buffer flush is done on the session daemon side for the kernel | |
657 | * so no need for the stream "hangup_flush_done" variable to be | |
658 | * tracked. This is important for a kernel stream since we don't rely | |
659 | * on the flush state of the stream to read data. It's not the case for | |
660 | * user space tracing. | |
661 | */ | |
662 | new_stream->hangup_flush_done = 0; | |
663 | ||
633d0084 DG |
664 | if (ctx->on_recv_stream) { |
665 | ret = ctx->on_recv_stream(new_stream); | |
666 | if (ret < 0) { | |
e316aad5 | 667 | consumer_del_stream(new_stream, NULL); |
633d0084 | 668 | goto end_nosignal; |
fb3a43a9 | 669 | } |
633d0084 | 670 | } |
fb3a43a9 | 671 | |
07b86b52 JD |
672 | if (new_stream->metadata_flag) { |
673 | channel->metadata_stream = new_stream; | |
674 | } | |
675 | ||
2bba9e53 DG |
676 | /* Do not monitor this stream. */ |
677 | if (!channel->monitor) { | |
5eecee74 | 678 | DBG("Kernel consumer add stream %s in no monitor mode with " |
6dc3064a | 679 | "relayd id %" PRIu64, new_stream->name, |
5eecee74 | 680 | new_stream->net_seq_idx); |
07b86b52 JD |
681 | cds_list_add(&new_stream->no_monitor_node, |
682 | &channel->stream_no_monitor_list.head); | |
6dc3064a DG |
683 | break; |
684 | } | |
685 | ||
e2039c7a JD |
686 | ret = send_relayd_stream(new_stream, NULL); |
687 | if (ret < 0) { | |
688 | consumer_del_stream(new_stream, NULL); | |
689 | goto end_nosignal; | |
690 | } | |
691 | ||
50f8ae69 | 692 | /* Get the right pipe where the stream will be sent. */ |
633d0084 | 693 | if (new_stream->metadata_flag) { |
dae10966 | 694 | stream_pipe = ctx->consumer_metadata_pipe; |
3bd1e081 | 695 | } else { |
dae10966 | 696 | stream_pipe = ctx->consumer_data_pipe; |
50f8ae69 DG |
697 | } |
698 | ||
dae10966 | 699 | ret = lttng_pipe_write(stream_pipe, &new_stream, sizeof(new_stream)); |
50f8ae69 | 700 | if (ret < 0) { |
dae10966 | 701 | ERR("Consumer write %s stream to pipe %d", |
50f8ae69 | 702 | new_stream->metadata_flag ? "metadata" : "data", |
dae10966 | 703 | lttng_pipe_get_writefd(stream_pipe)); |
50f8ae69 DG |
704 | consumer_del_stream(new_stream, NULL); |
705 | goto end_nosignal; | |
3bd1e081 | 706 | } |
00e2e675 | 707 | |
50f8ae69 | 708 | DBG("Kernel consumer ADD_STREAM %s (fd: %d) with relayd id %" PRIu64, |
ffe60014 | 709 | new_stream->name, fd, new_stream->relayd_stream_id); |
3bd1e081 MD |
710 | break; |
711 | } | |
712 | case LTTNG_CONSUMER_UPDATE_STREAM: | |
713 | { | |
3f8e211f DG |
714 | rcu_read_unlock(); |
715 | return -ENOSYS; | |
716 | } | |
717 | case LTTNG_CONSUMER_DESTROY_RELAYD: | |
718 | { | |
a6ba4fe1 | 719 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
3f8e211f DG |
720 | struct consumer_relayd_sock_pair *relayd; |
721 | ||
a6ba4fe1 | 722 | DBG("Kernel consumer destroying relayd %" PRIu64, index); |
3f8e211f DG |
723 | |
724 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 725 | relayd = consumer_find_relayd(index); |
3f8e211f | 726 | if (relayd == NULL) { |
3448e266 | 727 | DBG("Unable to find relayd %" PRIu64, index); |
f50f23d9 | 728 | ret_code = LTTNG_ERR_NO_CONSUMER; |
3bd1e081 | 729 | } |
3f8e211f | 730 | |
a6ba4fe1 DG |
731 | /* |
732 | * Each relayd socket pair has a refcount of stream attached to it | |
733 | * which tells if the relayd is still active or not depending on the | |
734 | * refcount value. | |
735 | * | |
736 | * This will set the destroy flag of the relayd object and destroy it | |
737 | * if the refcount reaches zero when called. | |
738 | * | |
739 | * The destroy can happen either here or when a stream fd hangs up. | |
740 | */ | |
f50f23d9 DG |
741 | if (relayd) { |
742 | consumer_flag_relayd_for_destroy(relayd); | |
743 | } | |
744 | ||
745 | ret = consumer_send_status_msg(sock, ret_code); | |
746 | if (ret < 0) { | |
747 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 748 | goto error_fatal; |
f50f23d9 | 749 | } |
3f8e211f | 750 | |
3f8e211f | 751 | goto end_nosignal; |
3bd1e081 | 752 | } |
6d805429 | 753 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 754 | { |
c8f59ee5 | 755 | int32_t ret; |
6d805429 | 756 | uint64_t id = msg.u.data_pending.session_id; |
c8f59ee5 | 757 | |
6d805429 | 758 | DBG("Kernel consumer data pending command for id %" PRIu64, id); |
c8f59ee5 | 759 | |
6d805429 | 760 | ret = consumer_data_pending(id); |
c8f59ee5 DG |
761 | |
762 | /* Send back returned value to session daemon */ | |
763 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
764 | if (ret < 0) { | |
6d805429 | 765 | PERROR("send data pending ret code"); |
1803a064 | 766 | goto error_fatal; |
c8f59ee5 | 767 | } |
f50f23d9 DG |
768 | |
769 | /* | |
770 | * No need to send back a status message since the data pending | |
771 | * returned value is the response. | |
772 | */ | |
c8f59ee5 | 773 | break; |
53632229 | 774 | } |
6dc3064a DG |
775 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
776 | { | |
07b86b52 JD |
777 | if (msg.u.snapshot_channel.metadata == 1) { |
778 | ret = lttng_kconsumer_snapshot_metadata(msg.u.snapshot_channel.key, | |
e2039c7a JD |
779 | msg.u.snapshot_channel.pathname, |
780 | msg.u.snapshot_channel.relayd_id, ctx); | |
07b86b52 JD |
781 | if (ret < 0) { |
782 | ERR("Snapshot metadata failed"); | |
783 | ret_code = LTTNG_ERR_KERN_META_FAIL; | |
784 | } | |
785 | } else { | |
786 | ret = lttng_kconsumer_snapshot_channel(msg.u.snapshot_channel.key, | |
787 | msg.u.snapshot_channel.pathname, | |
788 | msg.u.snapshot_channel.relayd_id, ctx); | |
789 | if (ret < 0) { | |
790 | ERR("Snapshot channel failed"); | |
791 | ret_code = LTTNG_ERR_KERN_CHAN_FAIL; | |
792 | } | |
793 | } | |
794 | ||
6dc3064a DG |
795 | ret = consumer_send_status_msg(sock, ret_code); |
796 | if (ret < 0) { | |
797 | /* Somehow, the session daemon is not responding anymore. */ | |
798 | goto end_nosignal; | |
799 | } | |
800 | break; | |
801 | } | |
07b86b52 JD |
802 | case LTTNG_CONSUMER_DESTROY_CHANNEL: |
803 | { | |
804 | uint64_t key = msg.u.destroy_channel.key; | |
805 | struct lttng_consumer_channel *channel; | |
806 | ||
807 | channel = consumer_find_channel(key); | |
808 | if (!channel) { | |
809 | ERR("Kernel consumer destroy channel %" PRIu64 " not found", key); | |
810 | ret_code = LTTNG_ERR_KERN_CHAN_NOT_FOUND; | |
811 | } | |
812 | ||
813 | ret = consumer_send_status_msg(sock, ret_code); | |
814 | if (ret < 0) { | |
815 | /* Somehow, the session daemon is not responding anymore. */ | |
816 | goto end_nosignal; | |
817 | } | |
818 | ||
819 | /* | |
820 | * This command should ONLY be issued for channel with streams set in | |
821 | * no monitor mode. | |
822 | */ | |
823 | assert(!channel->monitor); | |
824 | ||
825 | /* | |
826 | * The refcount should ALWAYS be 0 in the case of a channel in no | |
827 | * monitor mode. | |
828 | */ | |
829 | assert(!uatomic_sub_return(&channel->refcount, 1)); | |
830 | ||
831 | consumer_del_channel(channel); | |
832 | ||
833 | goto end_nosignal; | |
834 | } | |
3bd1e081 | 835 | default: |
3f8e211f | 836 | goto end_nosignal; |
3bd1e081 | 837 | } |
3f8e211f | 838 | |
3bd1e081 | 839 | end_nosignal: |
b0b335c8 | 840 | rcu_read_unlock(); |
4cbc1a04 DG |
841 | |
842 | /* | |
843 | * Return 1 to indicate success since the 0 value can be a socket | |
844 | * shutdown during the recv() or send() call. | |
845 | */ | |
846 | return 1; | |
1803a064 MD |
847 | |
848 | error_fatal: | |
849 | rcu_read_unlock(); | |
850 | /* This will issue a consumer stop. */ | |
851 | return -1; | |
3bd1e081 | 852 | } |
d41f73b7 MD |
853 | |
854 | /* | |
855 | * Consume data on a file descriptor and write it on a trace file. | |
856 | */ | |
4078b776 | 857 | ssize_t lttng_kconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
858 | struct lttng_consumer_local_data *ctx) |
859 | { | |
1d4dfdef | 860 | unsigned long len, subbuf_size, padding; |
d41f73b7 | 861 | int err; |
4078b776 | 862 | ssize_t ret = 0; |
d41f73b7 MD |
863 | int infd = stream->wait_fd; |
864 | ||
865 | DBG("In read_subbuffer (infd : %d)", infd); | |
866 | /* Get the next subbuffer */ | |
867 | err = kernctl_get_next_subbuf(infd); | |
868 | if (err != 0) { | |
1d4dfdef | 869 | ret = err; |
d41f73b7 MD |
870 | /* |
871 | * This is a debug message even for single-threaded consumer, | |
872 | * because poll() have more relaxed criterions than get subbuf, | |
873 | * so get_subbuf may fail for short race windows where poll() | |
874 | * would issue wakeups. | |
875 | */ | |
876 | DBG("Reserving sub buffer failed (everything is normal, " | |
877 | "it is due to concurrency)"); | |
878 | goto end; | |
879 | } | |
880 | ||
1d4dfdef DG |
881 | /* Get the full subbuffer size including padding */ |
882 | err = kernctl_get_padded_subbuf_size(infd, &len); | |
883 | if (err != 0) { | |
884 | errno = -err; | |
885 | perror("Getting sub-buffer len failed."); | |
886 | ret = err; | |
887 | goto end; | |
888 | } | |
889 | ||
ffe60014 | 890 | switch (stream->chan->output) { |
07b86b52 | 891 | case CONSUMER_CHANNEL_SPLICE: |
1d4dfdef DG |
892 | /* |
893 | * XXX: The lttng-modules splice "actor" does not handle copying | |
894 | * partial pages hence only using the subbuffer size without the | |
895 | * padding makes the splice fail. | |
896 | */ | |
897 | subbuf_size = len; | |
898 | padding = 0; | |
899 | ||
900 | /* splice the subbuffer to the tracefile */ | |
91dfef6e DG |
901 | ret = lttng_consumer_on_read_subbuffer_splice(ctx, stream, subbuf_size, |
902 | padding); | |
903 | /* | |
904 | * XXX: Splice does not support network streaming so the return value | |
905 | * is simply checked against subbuf_size and not like the mmap() op. | |
906 | */ | |
1d4dfdef DG |
907 | if (ret != subbuf_size) { |
908 | /* | |
909 | * display the error but continue processing to try | |
910 | * to release the subbuffer | |
911 | */ | |
912 | ERR("Error splicing to tracefile (ret: %zd != len: %lu)", | |
913 | ret, subbuf_size); | |
914 | } | |
915 | break; | |
07b86b52 | 916 | case CONSUMER_CHANNEL_MMAP: |
1d4dfdef DG |
917 | /* Get subbuffer size without padding */ |
918 | err = kernctl_get_subbuf_size(infd, &subbuf_size); | |
919 | if (err != 0) { | |
920 | errno = -err; | |
921 | perror("Getting sub-buffer len failed."); | |
922 | ret = err; | |
923 | goto end; | |
924 | } | |
47e81c02 | 925 | |
1d4dfdef DG |
926 | /* Make sure the tracer is not gone mad on us! */ |
927 | assert(len >= subbuf_size); | |
928 | ||
929 | padding = len - subbuf_size; | |
930 | ||
931 | /* write the subbuffer to the tracefile */ | |
91dfef6e DG |
932 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, |
933 | padding); | |
934 | /* | |
935 | * The mmap operation should write subbuf_size amount of data when | |
936 | * network streaming or the full padding (len) size when we are _not_ | |
937 | * streaming. | |
938 | */ | |
d88aee68 DG |
939 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
940 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
1d4dfdef | 941 | /* |
91dfef6e DG |
942 | * Display the error but continue processing to try to release the |
943 | * subbuffer | |
1d4dfdef | 944 | */ |
91dfef6e DG |
945 | ERR("Error writing to tracefile " |
946 | "(ret: %zd != len: %lu != subbuf_size: %lu)", | |
947 | ret, len, subbuf_size); | |
1d4dfdef DG |
948 | } |
949 | break; | |
950 | default: | |
951 | ERR("Unknown output method"); | |
952 | ret = -1; | |
d41f73b7 MD |
953 | } |
954 | ||
955 | err = kernctl_put_next_subbuf(infd); | |
956 | if (err != 0) { | |
21073eaa | 957 | errno = -err; |
d41f73b7 MD |
958 | if (errno == EFAULT) { |
959 | perror("Error in unreserving sub buffer\n"); | |
960 | } else if (errno == EIO) { | |
961 | /* Should never happen with newer LTTng versions */ | |
962 | perror("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
963 | } | |
21073eaa DG |
964 | |
965 | ret = -err; | |
d41f73b7 MD |
966 | goto end; |
967 | } | |
968 | ||
969 | end: | |
970 | return ret; | |
971 | } | |
972 | ||
973 | int lttng_kconsumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
974 | { | |
975 | int ret; | |
ffe60014 DG |
976 | |
977 | assert(stream); | |
978 | ||
2bba9e53 DG |
979 | /* |
980 | * Don't create anything if this is set for streaming or should not be | |
981 | * monitored. | |
982 | */ | |
983 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { | |
fe4477ee JD |
984 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
985 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
986 | stream->uid, stream->gid); | |
987 | if (ret < 0) { | |
988 | goto error; | |
989 | } | |
990 | stream->out_fd = ret; | |
991 | stream->tracefile_size_current = 0; | |
ffe60014 | 992 | } |
d41f73b7 | 993 | |
d41f73b7 MD |
994 | if (stream->output == LTTNG_EVENT_MMAP) { |
995 | /* get the len of the mmap region */ | |
996 | unsigned long mmap_len; | |
997 | ||
998 | ret = kernctl_get_mmap_len(stream->wait_fd, &mmap_len); | |
999 | if (ret != 0) { | |
87dc6a9c | 1000 | errno = -ret; |
ffe60014 | 1001 | PERROR("kernctl_get_mmap_len"); |
d41f73b7 MD |
1002 | goto error_close_fd; |
1003 | } | |
1004 | stream->mmap_len = (size_t) mmap_len; | |
1005 | ||
ffe60014 DG |
1006 | stream->mmap_base = mmap(NULL, stream->mmap_len, PROT_READ, |
1007 | MAP_PRIVATE, stream->wait_fd, 0); | |
d41f73b7 | 1008 | if (stream->mmap_base == MAP_FAILED) { |
ffe60014 | 1009 | PERROR("Error mmaping"); |
d41f73b7 MD |
1010 | ret = -1; |
1011 | goto error_close_fd; | |
1012 | } | |
1013 | } | |
1014 | ||
1015 | /* we return 0 to let the library handle the FD internally */ | |
1016 | return 0; | |
1017 | ||
1018 | error_close_fd: | |
1019 | { | |
1020 | int err; | |
1021 | ||
1022 | err = close(stream->out_fd); | |
1023 | assert(!err); | |
1024 | } | |
1025 | error: | |
1026 | return ret; | |
1027 | } | |
1028 | ||
ca22feea DG |
1029 | /* |
1030 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
1031 | * stream. Consumer data lock MUST be acquired before calling this function |
1032 | * and the stream lock. | |
ca22feea | 1033 | * |
6d805429 | 1034 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
1035 | * data is available for trace viewer reading. |
1036 | */ | |
6d805429 | 1037 | int lttng_kconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
1038 | { |
1039 | int ret; | |
1040 | ||
1041 | assert(stream); | |
1042 | ||
ca22feea DG |
1043 | ret = kernctl_get_next_subbuf(stream->wait_fd); |
1044 | if (ret == 0) { | |
1045 | /* There is still data so let's put back this subbuffer. */ | |
1046 | ret = kernctl_put_subbuf(stream->wait_fd); | |
1047 | assert(ret == 0); | |
6d805429 | 1048 | ret = 1; /* Data is pending */ |
4e9a4686 | 1049 | goto end; |
ca22feea DG |
1050 | } |
1051 | ||
6d805429 DG |
1052 | /* Data is NOT pending and ready to be read. */ |
1053 | ret = 0; | |
ca22feea | 1054 | |
6efae65e DG |
1055 | end: |
1056 | return ret; | |
ca22feea | 1057 | } |