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