Commit | Line | Data |
---|---|---|
3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
b3530820 | 4 | * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
3bd1e081 | 5 | * |
d14d33bf AM |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License, version 2 only, | |
8 | * as published by the Free Software Foundation. | |
3bd1e081 MD |
9 | * |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
d14d33bf AM |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
3bd1e081 MD |
18 | */ |
19 | ||
6c1c0768 | 20 | #define _LGPL_SOURCE |
3bd1e081 | 21 | #include <assert.h> |
3bd1e081 MD |
22 | #include <poll.h> |
23 | #include <pthread.h> | |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | #include <sys/mman.h> | |
27 | #include <sys/socket.h> | |
28 | #include <sys/types.h> | |
77c7c900 | 29 | #include <inttypes.h> |
3bd1e081 | 30 | #include <unistd.h> |
dbb5dfe6 | 31 | #include <sys/stat.h> |
3bd1e081 | 32 | |
51a9e1c7 | 33 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 34 | #include <common/common.h> |
10a8a223 | 35 | #include <common/kernel-ctl/kernel-ctl.h> |
10a8a223 | 36 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 37 | #include <common/sessiond-comm/relayd.h> |
dbb5dfe6 | 38 | #include <common/compat/fcntl.h> |
f263b7fd | 39 | #include <common/compat/endian.h> |
acdb9057 | 40 | #include <common/pipe.h> |
00e2e675 | 41 | #include <common/relayd/relayd.h> |
fe4477ee | 42 | #include <common/utils.h> |
c8fea79c | 43 | #include <common/consumer/consumer-stream.h> |
309167d2 | 44 | #include <common/index/index.h> |
c8fea79c | 45 | #include <common/consumer/consumer-timer.h> |
0857097f | 46 | |
10a8a223 | 47 | #include "kernel-consumer.h" |
3bd1e081 MD |
48 | |
49 | extern struct lttng_consumer_global_data consumer_data; | |
50 | extern int consumer_poll_timeout; | |
51 | extern volatile int consumer_quit; | |
52 | ||
3bd1e081 MD |
53 | /* |
54 | * Take a snapshot for a specific fd | |
55 | * | |
56 | * Returns 0 on success, < 0 on error | |
57 | */ | |
ffe60014 | 58 | int lttng_kconsumer_take_snapshot(struct lttng_consumer_stream *stream) |
3bd1e081 MD |
59 | { |
60 | int ret = 0; | |
61 | int infd = stream->wait_fd; | |
62 | ||
63 | ret = kernctl_snapshot(infd); | |
64 | if (ret != 0) { | |
5a510c9f | 65 | PERROR("Getting sub-buffer snapshot."); |
3bd1e081 MD |
66 | } |
67 | ||
68 | return ret; | |
69 | } | |
70 | ||
e9404c27 JG |
71 | /* |
72 | * Sample consumed and produced positions for a specific fd. | |
73 | * | |
74 | * Returns 0 on success, < 0 on error. | |
75 | */ | |
76 | int lttng_kconsumer_sample_snapshot_positions( | |
77 | struct lttng_consumer_stream *stream) | |
78 | { | |
79 | assert(stream); | |
80 | ||
81 | return kernctl_snapshot_sample_positions(stream->wait_fd); | |
82 | } | |
83 | ||
3bd1e081 MD |
84 | /* |
85 | * Get the produced position | |
86 | * | |
87 | * Returns 0 on success, < 0 on error | |
88 | */ | |
ffe60014 | 89 | int lttng_kconsumer_get_produced_snapshot(struct lttng_consumer_stream *stream, |
3bd1e081 MD |
90 | unsigned long *pos) |
91 | { | |
92 | int ret; | |
93 | int infd = stream->wait_fd; | |
94 | ||
95 | ret = kernctl_snapshot_get_produced(infd, pos); | |
96 | if (ret != 0) { | |
5a510c9f | 97 | PERROR("kernctl_snapshot_get_produced"); |
3bd1e081 MD |
98 | } |
99 | ||
100 | return ret; | |
101 | } | |
102 | ||
07b86b52 JD |
103 | /* |
104 | * Get the consumerd position | |
105 | * | |
106 | * Returns 0 on success, < 0 on error | |
107 | */ | |
108 | int lttng_kconsumer_get_consumed_snapshot(struct lttng_consumer_stream *stream, | |
109 | unsigned long *pos) | |
110 | { | |
111 | int ret; | |
112 | int infd = stream->wait_fd; | |
113 | ||
114 | ret = kernctl_snapshot_get_consumed(infd, pos); | |
115 | if (ret != 0) { | |
5a510c9f | 116 | PERROR("kernctl_snapshot_get_consumed"); |
07b86b52 JD |
117 | } |
118 | ||
119 | return ret; | |
120 | } | |
121 | ||
07b86b52 JD |
122 | /* |
123 | * Take a snapshot of all the stream of a channel | |
124 | * | |
125 | * Returns 0 on success, < 0 on error | |
126 | */ | |
127 | int lttng_kconsumer_snapshot_channel(uint64_t key, char *path, | |
d07ceecd | 128 | uint64_t relayd_id, uint64_t nb_packets_per_stream, |
5c786ded | 129 | struct lttng_consumer_local_data *ctx) |
07b86b52 JD |
130 | { |
131 | int ret; | |
07b86b52 JD |
132 | struct lttng_consumer_channel *channel; |
133 | struct lttng_consumer_stream *stream; | |
134 | ||
6a00837f | 135 | DBG("Kernel consumer snapshot channel %" PRIu64, key); |
07b86b52 JD |
136 | |
137 | rcu_read_lock(); | |
138 | ||
139 | channel = consumer_find_channel(key); | |
140 | if (!channel) { | |
6a00837f | 141 | ERR("No channel found for key %" PRIu64, key); |
07b86b52 JD |
142 | ret = -1; |
143 | goto end; | |
144 | } | |
145 | ||
146 | /* Splice is not supported yet for channel snapshot. */ | |
147 | if (channel->output != CONSUMER_CHANNEL_MMAP) { | |
148 | ERR("Unsupported output %d", channel->output); | |
149 | ret = -1; | |
150 | goto end; | |
151 | } | |
152 | ||
10a50311 | 153 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { |
c13082a9 JD |
154 | /* Are we at a position _before_ the first available packet ? */ |
155 | bool before_first_packet = true; | |
923333cd | 156 | unsigned long consumed_pos, produced_pos; |
9ce5646a MD |
157 | |
158 | health_code_update(); | |
159 | ||
07b86b52 JD |
160 | /* |
161 | * Lock stream because we are about to change its state. | |
162 | */ | |
163 | pthread_mutex_lock(&stream->lock); | |
164 | ||
29decac3 DG |
165 | /* |
166 | * Assign the received relayd ID so we can use it for streaming. The streams | |
167 | * are not visible to anyone so this is OK to change it. | |
168 | */ | |
07b86b52 JD |
169 | stream->net_seq_idx = relayd_id; |
170 | channel->relayd_id = relayd_id; | |
171 | if (relayd_id != (uint64_t) -1ULL) { | |
10a50311 | 172 | ret = consumer_send_relayd_stream(stream, path); |
07b86b52 JD |
173 | if (ret < 0) { |
174 | ERR("sending stream to relayd"); | |
175 | goto end_unlock; | |
176 | } | |
07b86b52 JD |
177 | } else { |
178 | ret = utils_create_stream_file(path, stream->name, | |
10a50311 JD |
179 | stream->chan->tracefile_size, |
180 | stream->tracefile_count_current, | |
309167d2 | 181 | stream->uid, stream->gid, NULL); |
07b86b52 JD |
182 | if (ret < 0) { |
183 | ERR("utils_create_stream_file"); | |
184 | goto end_unlock; | |
185 | } | |
186 | ||
187 | stream->out_fd = ret; | |
188 | stream->tracefile_size_current = 0; | |
189 | ||
81ea21bf MD |
190 | DBG("Kernel consumer snapshot stream %s/%s (%" PRIu64 ")", |
191 | path, stream->name, stream->key); | |
07b86b52 | 192 | } |
601262d6 JD |
193 | if (relayd_id != -1ULL) { |
194 | ret = consumer_send_relayd_streams_sent(relayd_id); | |
195 | if (ret < 0) { | |
196 | ERR("sending streams sent to relayd"); | |
197 | goto end_unlock; | |
198 | } | |
a4baae1b | 199 | } |
07b86b52 JD |
200 | |
201 | ret = kernctl_buffer_flush(stream->wait_fd); | |
202 | if (ret < 0) { | |
10a50311 | 203 | ERR("Failed to flush kernel stream"); |
07b86b52 JD |
204 | goto end_unlock; |
205 | } | |
206 | ||
207 | ret = lttng_kconsumer_take_snapshot(stream); | |
208 | if (ret < 0) { | |
209 | ERR("Taking kernel snapshot"); | |
210 | goto end_unlock; | |
211 | } | |
212 | ||
213 | ret = lttng_kconsumer_get_produced_snapshot(stream, &produced_pos); | |
214 | if (ret < 0) { | |
215 | ERR("Produced kernel snapshot position"); | |
216 | goto end_unlock; | |
217 | } | |
218 | ||
219 | ret = lttng_kconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
220 | if (ret < 0) { | |
221 | ERR("Consumerd kernel snapshot position"); | |
222 | goto end_unlock; | |
223 | } | |
224 | ||
225 | if (stream->max_sb_size == 0) { | |
226 | ret = kernctl_get_max_subbuf_size(stream->wait_fd, | |
227 | &stream->max_sb_size); | |
228 | if (ret < 0) { | |
229 | ERR("Getting kernel max_sb_size"); | |
230 | goto end_unlock; | |
231 | } | |
232 | } | |
233 | ||
d07ceecd MD |
234 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
235 | produced_pos, nb_packets_per_stream, | |
236 | stream->max_sb_size); | |
5c786ded | 237 | |
07b86b52 JD |
238 | while (consumed_pos < produced_pos) { |
239 | ssize_t read_len; | |
240 | unsigned long len, padded_len; | |
c13082a9 | 241 | int lost_packet = 0; |
07b86b52 | 242 | |
9ce5646a MD |
243 | health_code_update(); |
244 | ||
07b86b52 JD |
245 | DBG("Kernel consumer taking snapshot at pos %lu", consumed_pos); |
246 | ||
247 | ret = kernctl_get_subbuf(stream->wait_fd, &consumed_pos); | |
248 | if (ret < 0) { | |
32af2c95 | 249 | if (ret != -EAGAIN) { |
07b86b52 JD |
250 | PERROR("kernctl_get_subbuf snapshot"); |
251 | goto end_unlock; | |
252 | } | |
253 | DBG("Kernel consumer get subbuf failed. Skipping it."); | |
254 | consumed_pos += stream->max_sb_size; | |
c13082a9 JD |
255 | |
256 | /* | |
257 | * Start accounting lost packets only when we | |
258 | * already have extracted packets (to match the | |
259 | * content of the final snapshot). | |
260 | */ | |
261 | if (!before_first_packet) { | |
262 | lost_packet = 1; | |
263 | } | |
07b86b52 JD |
264 | continue; |
265 | } | |
266 | ||
267 | ret = kernctl_get_subbuf_size(stream->wait_fd, &len); | |
268 | if (ret < 0) { | |
269 | ERR("Snapshot kernctl_get_subbuf_size"); | |
29decac3 | 270 | goto error_put_subbuf; |
07b86b52 JD |
271 | } |
272 | ||
273 | ret = kernctl_get_padded_subbuf_size(stream->wait_fd, &padded_len); | |
274 | if (ret < 0) { | |
275 | ERR("Snapshot kernctl_get_padded_subbuf_size"); | |
29decac3 | 276 | goto error_put_subbuf; |
07b86b52 JD |
277 | } |
278 | ||
279 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
309167d2 | 280 | padded_len - len, NULL); |
07b86b52 | 281 | /* |
29decac3 DG |
282 | * We write the padded len in local tracefiles but the data len |
283 | * when using a relay. Display the error but continue processing | |
284 | * to try to release the subbuffer. | |
07b86b52 JD |
285 | */ |
286 | if (relayd_id != (uint64_t) -1ULL) { | |
287 | if (read_len != len) { | |
288 | ERR("Error sending to the relay (ret: %zd != len: %lu)", | |
289 | read_len, len); | |
290 | } | |
291 | } else { | |
292 | if (read_len != padded_len) { | |
293 | ERR("Error writing to tracefile (ret: %zd != len: %lu)", | |
294 | read_len, padded_len); | |
295 | } | |
296 | } | |
297 | ||
298 | ret = kernctl_put_subbuf(stream->wait_fd); | |
299 | if (ret < 0) { | |
300 | ERR("Snapshot kernctl_put_subbuf"); | |
301 | goto end_unlock; | |
302 | } | |
303 | consumed_pos += stream->max_sb_size; | |
c13082a9 JD |
304 | |
305 | /* | |
306 | * Only account lost packets located between | |
307 | * succesfully extracted packets (do not account before | |
308 | * and after since they are not visible in the | |
309 | * resulting snapshot). | |
310 | */ | |
311 | stream->chan->lost_packets += lost_packet; | |
312 | lost_packet = 0; | |
313 | before_first_packet = false; | |
07b86b52 JD |
314 | } |
315 | ||
316 | if (relayd_id == (uint64_t) -1ULL) { | |
fdf9986c MD |
317 | if (stream->out_fd >= 0) { |
318 | ret = close(stream->out_fd); | |
319 | if (ret < 0) { | |
320 | PERROR("Kernel consumer snapshot close out_fd"); | |
321 | goto end_unlock; | |
322 | } | |
323 | stream->out_fd = -1; | |
07b86b52 | 324 | } |
07b86b52 JD |
325 | } else { |
326 | close_relayd_stream(stream); | |
327 | stream->net_seq_idx = (uint64_t) -1ULL; | |
328 | } | |
329 | pthread_mutex_unlock(&stream->lock); | |
330 | } | |
331 | ||
332 | /* All good! */ | |
333 | ret = 0; | |
334 | goto end; | |
335 | ||
29decac3 DG |
336 | error_put_subbuf: |
337 | ret = kernctl_put_subbuf(stream->wait_fd); | |
338 | if (ret < 0) { | |
339 | ERR("Snapshot kernctl_put_subbuf error path"); | |
340 | } | |
07b86b52 JD |
341 | end_unlock: |
342 | pthread_mutex_unlock(&stream->lock); | |
343 | end: | |
344 | rcu_read_unlock(); | |
345 | return ret; | |
346 | } | |
347 | ||
348 | /* | |
349 | * Read the whole metadata available for a snapshot. | |
350 | * | |
351 | * Returns 0 on success, < 0 on error | |
352 | */ | |
353 | int lttng_kconsumer_snapshot_metadata(uint64_t key, char *path, | |
e2039c7a | 354 | uint64_t relayd_id, struct lttng_consumer_local_data *ctx) |
07b86b52 | 355 | { |
d771f832 DG |
356 | int ret, use_relayd = 0; |
357 | ssize_t ret_read; | |
07b86b52 JD |
358 | struct lttng_consumer_channel *metadata_channel; |
359 | struct lttng_consumer_stream *metadata_stream; | |
d771f832 DG |
360 | |
361 | assert(ctx); | |
07b86b52 JD |
362 | |
363 | DBG("Kernel consumer snapshot metadata with key %" PRIu64 " at path %s", | |
364 | key, path); | |
365 | ||
366 | rcu_read_lock(); | |
367 | ||
368 | metadata_channel = consumer_find_channel(key); | |
369 | if (!metadata_channel) { | |
d771f832 | 370 | ERR("Kernel snapshot metadata not found for key %" PRIu64, key); |
07b86b52 | 371 | ret = -1; |
d771f832 | 372 | goto error; |
07b86b52 JD |
373 | } |
374 | ||
375 | metadata_stream = metadata_channel->metadata_stream; | |
376 | assert(metadata_stream); | |
377 | ||
d771f832 | 378 | /* Flag once that we have a valid relayd for the stream. */ |
e2039c7a | 379 | if (relayd_id != (uint64_t) -1ULL) { |
d771f832 DG |
380 | use_relayd = 1; |
381 | } | |
382 | ||
383 | if (use_relayd) { | |
10a50311 | 384 | ret = consumer_send_relayd_stream(metadata_stream, path); |
e2039c7a | 385 | if (ret < 0) { |
d771f832 | 386 | goto error; |
e2039c7a | 387 | } |
e2039c7a JD |
388 | } else { |
389 | ret = utils_create_stream_file(path, metadata_stream->name, | |
390 | metadata_stream->chan->tracefile_size, | |
391 | metadata_stream->tracefile_count_current, | |
309167d2 | 392 | metadata_stream->uid, metadata_stream->gid, NULL); |
e2039c7a | 393 | if (ret < 0) { |
d771f832 | 394 | goto error; |
e2039c7a JD |
395 | } |
396 | metadata_stream->out_fd = ret; | |
07b86b52 | 397 | } |
07b86b52 | 398 | |
d771f832 | 399 | do { |
9ce5646a MD |
400 | health_code_update(); |
401 | ||
d771f832 DG |
402 | ret_read = lttng_kconsumer_read_subbuffer(metadata_stream, ctx); |
403 | if (ret_read < 0) { | |
56591bac | 404 | if (ret_read != -EAGAIN) { |
6a00837f | 405 | ERR("Kernel snapshot reading metadata subbuffer (ret: %zd)", |
d771f832 DG |
406 | ret_read); |
407 | goto error; | |
07b86b52 | 408 | } |
d771f832 | 409 | /* ret_read is negative at this point so we will exit the loop. */ |
07b86b52 JD |
410 | continue; |
411 | } | |
d771f832 | 412 | } while (ret_read >= 0); |
07b86b52 | 413 | |
d771f832 DG |
414 | if (use_relayd) { |
415 | close_relayd_stream(metadata_stream); | |
416 | metadata_stream->net_seq_idx = (uint64_t) -1ULL; | |
417 | } else { | |
fdf9986c MD |
418 | if (metadata_stream->out_fd >= 0) { |
419 | ret = close(metadata_stream->out_fd); | |
420 | if (ret < 0) { | |
421 | PERROR("Kernel consumer snapshot metadata close out_fd"); | |
422 | /* | |
423 | * Don't go on error here since the snapshot was successful at this | |
424 | * point but somehow the close failed. | |
425 | */ | |
426 | } | |
427 | metadata_stream->out_fd = -1; | |
e2039c7a | 428 | } |
e2039c7a JD |
429 | } |
430 | ||
07b86b52 | 431 | ret = 0; |
d771f832 | 432 | |
cf53a8a6 JD |
433 | cds_list_del(&metadata_stream->send_node); |
434 | consumer_stream_destroy(metadata_stream, NULL); | |
435 | metadata_channel->metadata_stream = NULL; | |
d771f832 | 436 | error: |
07b86b52 JD |
437 | rcu_read_unlock(); |
438 | return ret; | |
439 | } | |
440 | ||
1803a064 MD |
441 | /* |
442 | * Receive command from session daemon and process it. | |
443 | * | |
444 | * Return 1 on success else a negative value or 0. | |
445 | */ | |
3bd1e081 MD |
446 | int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
447 | int sock, struct pollfd *consumer_sockpoll) | |
448 | { | |
449 | ssize_t ret; | |
0c759fc9 | 450 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 MD |
451 | struct lttcomm_consumer_msg msg; |
452 | ||
9ce5646a MD |
453 | health_code_update(); |
454 | ||
3bd1e081 MD |
455 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
456 | if (ret != sizeof(msg)) { | |
1803a064 | 457 | if (ret > 0) { |
c6857fcf | 458 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
1803a064 MD |
459 | ret = -1; |
460 | } | |
3bd1e081 MD |
461 | return ret; |
462 | } | |
9ce5646a MD |
463 | |
464 | health_code_update(); | |
465 | ||
84382d49 MD |
466 | /* Deprecated command */ |
467 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 468 | |
9ce5646a MD |
469 | health_code_update(); |
470 | ||
b0b335c8 MD |
471 | /* relayd needs RCU read-side protection */ |
472 | rcu_read_lock(); | |
473 | ||
3bd1e081 | 474 | switch (msg.cmd_type) { |
00e2e675 DG |
475 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
476 | { | |
f50f23d9 | 477 | /* Session daemon status message are handled in the following call. */ |
7735ef9e DG |
478 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
479 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, | |
d3e2ba59 JD |
480 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
481 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
482 | goto end_nosignal; |
483 | } | |
3bd1e081 MD |
484 | case LTTNG_CONSUMER_ADD_CHANNEL: |
485 | { | |
486 | struct lttng_consumer_channel *new_channel; | |
e43c41c5 | 487 | int ret_recv; |
3bd1e081 | 488 | |
9ce5646a MD |
489 | health_code_update(); |
490 | ||
f50f23d9 DG |
491 | /* First send a status message before receiving the fds. */ |
492 | ret = consumer_send_status_msg(sock, ret_code); | |
493 | if (ret < 0) { | |
494 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 495 | goto error_fatal; |
f50f23d9 | 496 | } |
9ce5646a MD |
497 | |
498 | health_code_update(); | |
499 | ||
d88aee68 | 500 | DBG("consumer_add_channel %" PRIu64, msg.u.channel.channel_key); |
3bd1e081 | 501 | new_channel = consumer_allocate_channel(msg.u.channel.channel_key, |
ffe60014 DG |
502 | msg.u.channel.session_id, msg.u.channel.pathname, |
503 | msg.u.channel.name, msg.u.channel.uid, msg.u.channel.gid, | |
1624d5b7 JD |
504 | msg.u.channel.relayd_id, msg.u.channel.output, |
505 | msg.u.channel.tracefile_size, | |
1950109e | 506 | msg.u.channel.tracefile_count, 0, |
ecc48a90 | 507 | msg.u.channel.monitor, |
d7ba1388 | 508 | msg.u.channel.live_timer_interval, |
3d071855 | 509 | NULL, NULL); |
3bd1e081 | 510 | if (new_channel == NULL) { |
f73fabfd | 511 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
3bd1e081 MD |
512 | goto end_nosignal; |
513 | } | |
ffe60014 | 514 | new_channel->nb_init_stream_left = msg.u.channel.nb_init_streams; |
95a1109b JD |
515 | switch (msg.u.channel.output) { |
516 | case LTTNG_EVENT_SPLICE: | |
517 | new_channel->output = CONSUMER_CHANNEL_SPLICE; | |
518 | break; | |
519 | case LTTNG_EVENT_MMAP: | |
520 | new_channel->output = CONSUMER_CHANNEL_MMAP; | |
521 | break; | |
522 | default: | |
523 | ERR("Channel output unknown %d", msg.u.channel.output); | |
524 | goto end_nosignal; | |
525 | } | |
ffe60014 DG |
526 | |
527 | /* Translate and save channel type. */ | |
528 | switch (msg.u.channel.type) { | |
529 | case CONSUMER_CHANNEL_TYPE_DATA: | |
530 | case CONSUMER_CHANNEL_TYPE_METADATA: | |
531 | new_channel->type = msg.u.channel.type; | |
532 | break; | |
533 | default: | |
534 | assert(0); | |
535 | goto end_nosignal; | |
536 | }; | |
537 | ||
9ce5646a MD |
538 | health_code_update(); |
539 | ||
3bd1e081 | 540 | if (ctx->on_recv_channel != NULL) { |
e43c41c5 JD |
541 | ret_recv = ctx->on_recv_channel(new_channel); |
542 | if (ret_recv == 0) { | |
543 | ret = consumer_add_channel(new_channel, ctx); | |
544 | } else if (ret_recv < 0) { | |
3bd1e081 MD |
545 | goto end_nosignal; |
546 | } | |
547 | } else { | |
e43c41c5 | 548 | ret = consumer_add_channel(new_channel, ctx); |
3bd1e081 | 549 | } |
e9404c27 JG |
550 | if (msg.u.channel.type == CONSUMER_CHANNEL_TYPE_DATA && !ret) { |
551 | int monitor_start_ret; | |
552 | ||
553 | DBG("Consumer starting monitor timer"); | |
94d49140 JD |
554 | consumer_timer_live_start(new_channel, |
555 | msg.u.channel.live_timer_interval); | |
e9404c27 JG |
556 | monitor_start_ret = consumer_timer_monitor_start( |
557 | new_channel, | |
558 | msg.u.channel.monitor_timer_interval); | |
559 | if (monitor_start_ret < 0) { | |
560 | ERR("Starting channel monitoring timer failed"); | |
561 | goto end_nosignal; | |
562 | } | |
563 | ||
94d49140 | 564 | } |
e43c41c5 | 565 | |
9ce5646a MD |
566 | health_code_update(); |
567 | ||
e43c41c5 | 568 | /* If we received an error in add_channel, we need to report it. */ |
821fffb2 | 569 | if (ret < 0) { |
1803a064 MD |
570 | ret = consumer_send_status_msg(sock, ret); |
571 | if (ret < 0) { | |
572 | goto error_fatal; | |
573 | } | |
e43c41c5 JD |
574 | goto end_nosignal; |
575 | } | |
576 | ||
3bd1e081 MD |
577 | goto end_nosignal; |
578 | } | |
579 | case LTTNG_CONSUMER_ADD_STREAM: | |
580 | { | |
dae10966 DG |
581 | int fd; |
582 | struct lttng_pipe *stream_pipe; | |
00e2e675 | 583 | struct lttng_consumer_stream *new_stream; |
ffe60014 | 584 | struct lttng_consumer_channel *channel; |
c80048c6 | 585 | int alloc_ret = 0; |
3bd1e081 | 586 | |
ffe60014 DG |
587 | /* |
588 | * Get stream's channel reference. Needed when adding the stream to the | |
589 | * global hash table. | |
590 | */ | |
591 | channel = consumer_find_channel(msg.u.stream.channel_key); | |
592 | if (!channel) { | |
593 | /* | |
594 | * We could not find the channel. Can happen if cpu hotplug | |
595 | * happens while tearing down. | |
596 | */ | |
d88aee68 | 597 | ERR("Unable to find channel key %" PRIu64, msg.u.stream.channel_key); |
e462382a | 598 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
ffe60014 DG |
599 | } |
600 | ||
9ce5646a MD |
601 | health_code_update(); |
602 | ||
f50f23d9 DG |
603 | /* First send a status message before receiving the fds. */ |
604 | ret = consumer_send_status_msg(sock, ret_code); | |
1803a064 | 605 | if (ret < 0) { |
d771f832 | 606 | /* Somehow, the session daemon is not responding anymore. */ |
1803a064 MD |
607 | goto error_fatal; |
608 | } | |
9ce5646a MD |
609 | |
610 | health_code_update(); | |
611 | ||
0c759fc9 | 612 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
d771f832 | 613 | /* Channel was not found. */ |
f50f23d9 DG |
614 | goto end_nosignal; |
615 | } | |
616 | ||
d771f832 | 617 | /* Blocking call */ |
9ce5646a MD |
618 | health_poll_entry(); |
619 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
620 | health_poll_exit(); | |
84382d49 MD |
621 | if (ret) { |
622 | goto error_fatal; | |
3bd1e081 | 623 | } |
00e2e675 | 624 | |
9ce5646a MD |
625 | health_code_update(); |
626 | ||
00e2e675 | 627 | /* Get stream file descriptor from socket */ |
f2fc6720 MD |
628 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); |
629 | if (ret != sizeof(fd)) { | |
f73fabfd | 630 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
3f8e211f | 631 | rcu_read_unlock(); |
3bd1e081 MD |
632 | return ret; |
633 | } | |
3bd1e081 | 634 | |
9ce5646a MD |
635 | health_code_update(); |
636 | ||
f50f23d9 DG |
637 | /* |
638 | * Send status code to session daemon only if the recv works. If the | |
639 | * above recv() failed, the session daemon is notified through the | |
640 | * error socket and the teardown is eventually done. | |
641 | */ | |
642 | ret = consumer_send_status_msg(sock, ret_code); | |
643 | if (ret < 0) { | |
644 | /* Somehow, the session daemon is not responding anymore. */ | |
645 | goto end_nosignal; | |
646 | } | |
647 | ||
9ce5646a MD |
648 | health_code_update(); |
649 | ||
ffe60014 DG |
650 | new_stream = consumer_allocate_stream(channel->key, |
651 | fd, | |
652 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
653 | channel->name, | |
654 | channel->uid, | |
655 | channel->gid, | |
656 | channel->relayd_id, | |
657 | channel->session_id, | |
658 | msg.u.stream.cpu, | |
659 | &alloc_ret, | |
4891ece8 DG |
660 | channel->type, |
661 | channel->monitor); | |
3bd1e081 | 662 | if (new_stream == NULL) { |
c80048c6 MD |
663 | switch (alloc_ret) { |
664 | case -ENOMEM: | |
665 | case -EINVAL: | |
666 | default: | |
667 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
668 | break; | |
c80048c6 | 669 | } |
3f8e211f | 670 | goto end_nosignal; |
3bd1e081 | 671 | } |
d771f832 | 672 | |
ffe60014 DG |
673 | new_stream->chan = channel; |
674 | new_stream->wait_fd = fd; | |
07b86b52 JD |
675 | switch (channel->output) { |
676 | case CONSUMER_CHANNEL_SPLICE: | |
677 | new_stream->output = LTTNG_EVENT_SPLICE; | |
a2361a61 JD |
678 | ret = utils_create_pipe(new_stream->splice_pipe); |
679 | if (ret < 0) { | |
680 | goto end_nosignal; | |
681 | } | |
07b86b52 JD |
682 | break; |
683 | case CONSUMER_CHANNEL_MMAP: | |
684 | new_stream->output = LTTNG_EVENT_MMAP; | |
685 | break; | |
686 | default: | |
687 | ERR("Stream output unknown %d", channel->output); | |
688 | goto end_nosignal; | |
689 | } | |
00e2e675 | 690 | |
a0c83db9 DG |
691 | /* |
692 | * We've just assigned the channel to the stream so increment the | |
07b86b52 JD |
693 | * refcount right now. We don't need to increment the refcount for |
694 | * streams in no monitor because we handle manually the cleanup of | |
695 | * those. It is very important to make sure there is NO prior | |
696 | * consumer_del_stream() calls or else the refcount will be unbalanced. | |
a0c83db9 | 697 | */ |
07b86b52 JD |
698 | if (channel->monitor) { |
699 | uatomic_inc(&new_stream->chan->refcount); | |
700 | } | |
9d9353f9 | 701 | |
fb3a43a9 DG |
702 | /* |
703 | * The buffer flush is done on the session daemon side for the kernel | |
704 | * so no need for the stream "hangup_flush_done" variable to be | |
705 | * tracked. This is important for a kernel stream since we don't rely | |
706 | * on the flush state of the stream to read data. It's not the case for | |
707 | * user space tracing. | |
708 | */ | |
709 | new_stream->hangup_flush_done = 0; | |
710 | ||
9ce5646a MD |
711 | health_code_update(); |
712 | ||
633d0084 DG |
713 | if (ctx->on_recv_stream) { |
714 | ret = ctx->on_recv_stream(new_stream); | |
715 | if (ret < 0) { | |
d771f832 | 716 | consumer_stream_free(new_stream); |
633d0084 | 717 | goto end_nosignal; |
fb3a43a9 | 718 | } |
633d0084 | 719 | } |
fb3a43a9 | 720 | |
9ce5646a MD |
721 | health_code_update(); |
722 | ||
07b86b52 JD |
723 | if (new_stream->metadata_flag) { |
724 | channel->metadata_stream = new_stream; | |
725 | } | |
726 | ||
2bba9e53 DG |
727 | /* Do not monitor this stream. */ |
728 | if (!channel->monitor) { | |
5eecee74 | 729 | DBG("Kernel consumer add stream %s in no monitor mode with " |
6dc3064a | 730 | "relayd id %" PRIu64, new_stream->name, |
5eecee74 | 731 | new_stream->net_seq_idx); |
10a50311 | 732 | cds_list_add(&new_stream->send_node, &channel->streams.head); |
6dc3064a DG |
733 | break; |
734 | } | |
735 | ||
e1b71bdc DG |
736 | /* Send stream to relayd if the stream has an ID. */ |
737 | if (new_stream->net_seq_idx != (uint64_t) -1ULL) { | |
194ee077 DG |
738 | ret = consumer_send_relayd_stream(new_stream, |
739 | new_stream->chan->pathname); | |
e1b71bdc DG |
740 | if (ret < 0) { |
741 | consumer_stream_free(new_stream); | |
742 | goto end_nosignal; | |
743 | } | |
e2039c7a JD |
744 | } |
745 | ||
50f8ae69 | 746 | /* Get the right pipe where the stream will be sent. */ |
633d0084 | 747 | if (new_stream->metadata_flag) { |
5ab66908 MD |
748 | ret = consumer_add_metadata_stream(new_stream); |
749 | if (ret) { | |
750 | ERR("Consumer add metadata stream %" PRIu64 " failed. Continuing", | |
751 | new_stream->key); | |
752 | consumer_stream_free(new_stream); | |
753 | goto end_nosignal; | |
754 | } | |
dae10966 | 755 | stream_pipe = ctx->consumer_metadata_pipe; |
3bd1e081 | 756 | } else { |
5ab66908 MD |
757 | ret = consumer_add_data_stream(new_stream); |
758 | if (ret) { | |
759 | ERR("Consumer add stream %" PRIu64 " failed. Continuing", | |
760 | new_stream->key); | |
761 | consumer_stream_free(new_stream); | |
762 | goto end_nosignal; | |
763 | } | |
dae10966 | 764 | stream_pipe = ctx->consumer_data_pipe; |
50f8ae69 DG |
765 | } |
766 | ||
5ab66908 MD |
767 | /* Vitible to other threads */ |
768 | new_stream->globally_visible = 1; | |
769 | ||
9ce5646a MD |
770 | health_code_update(); |
771 | ||
dae10966 | 772 | ret = lttng_pipe_write(stream_pipe, &new_stream, sizeof(new_stream)); |
50f8ae69 | 773 | if (ret < 0) { |
dae10966 | 774 | ERR("Consumer write %s stream to pipe %d", |
50f8ae69 | 775 | new_stream->metadata_flag ? "metadata" : "data", |
dae10966 | 776 | lttng_pipe_get_writefd(stream_pipe)); |
5ab66908 MD |
777 | if (new_stream->metadata_flag) { |
778 | consumer_del_stream_for_metadata(new_stream); | |
779 | } else { | |
780 | consumer_del_stream_for_data(new_stream); | |
781 | } | |
50f8ae69 | 782 | goto end_nosignal; |
3bd1e081 | 783 | } |
00e2e675 | 784 | |
50f8ae69 | 785 | DBG("Kernel consumer ADD_STREAM %s (fd: %d) with relayd id %" PRIu64, |
ffe60014 | 786 | new_stream->name, fd, new_stream->relayd_stream_id); |
3bd1e081 MD |
787 | break; |
788 | } | |
a4baae1b JD |
789 | case LTTNG_CONSUMER_STREAMS_SENT: |
790 | { | |
791 | struct lttng_consumer_channel *channel; | |
792 | ||
793 | /* | |
794 | * Get stream's channel reference. Needed when adding the stream to the | |
795 | * global hash table. | |
796 | */ | |
797 | channel = consumer_find_channel(msg.u.sent_streams.channel_key); | |
798 | if (!channel) { | |
799 | /* | |
800 | * We could not find the channel. Can happen if cpu hotplug | |
801 | * happens while tearing down. | |
802 | */ | |
803 | ERR("Unable to find channel key %" PRIu64, | |
804 | msg.u.sent_streams.channel_key); | |
e462382a | 805 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
a4baae1b JD |
806 | } |
807 | ||
808 | health_code_update(); | |
809 | ||
810 | /* | |
811 | * Send status code to session daemon. | |
812 | */ | |
813 | ret = consumer_send_status_msg(sock, ret_code); | |
f261ad0a | 814 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
a4baae1b JD |
815 | /* Somehow, the session daemon is not responding anymore. */ |
816 | goto end_nosignal; | |
817 | } | |
818 | ||
819 | health_code_update(); | |
820 | ||
821 | /* | |
822 | * We should not send this message if we don't monitor the | |
823 | * streams in this channel. | |
824 | */ | |
825 | if (!channel->monitor) { | |
826 | break; | |
827 | } | |
828 | ||
829 | health_code_update(); | |
830 | /* Send stream to relayd if the stream has an ID. */ | |
831 | if (msg.u.sent_streams.net_seq_idx != (uint64_t) -1ULL) { | |
832 | ret = consumer_send_relayd_streams_sent( | |
833 | msg.u.sent_streams.net_seq_idx); | |
834 | if (ret < 0) { | |
835 | goto end_nosignal; | |
836 | } | |
837 | } | |
838 | break; | |
839 | } | |
3bd1e081 MD |
840 | case LTTNG_CONSUMER_UPDATE_STREAM: |
841 | { | |
3f8e211f DG |
842 | rcu_read_unlock(); |
843 | return -ENOSYS; | |
844 | } | |
845 | case LTTNG_CONSUMER_DESTROY_RELAYD: | |
846 | { | |
a6ba4fe1 | 847 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
3f8e211f DG |
848 | struct consumer_relayd_sock_pair *relayd; |
849 | ||
a6ba4fe1 | 850 | DBG("Kernel consumer destroying relayd %" PRIu64, index); |
3f8e211f DG |
851 | |
852 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 853 | relayd = consumer_find_relayd(index); |
3f8e211f | 854 | if (relayd == NULL) { |
3448e266 | 855 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 856 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
3bd1e081 | 857 | } |
3f8e211f | 858 | |
a6ba4fe1 DG |
859 | /* |
860 | * Each relayd socket pair has a refcount of stream attached to it | |
861 | * which tells if the relayd is still active or not depending on the | |
862 | * refcount value. | |
863 | * | |
864 | * This will set the destroy flag of the relayd object and destroy it | |
865 | * if the refcount reaches zero when called. | |
866 | * | |
867 | * The destroy can happen either here or when a stream fd hangs up. | |
868 | */ | |
f50f23d9 DG |
869 | if (relayd) { |
870 | consumer_flag_relayd_for_destroy(relayd); | |
871 | } | |
872 | ||
9ce5646a MD |
873 | health_code_update(); |
874 | ||
f50f23d9 DG |
875 | ret = consumer_send_status_msg(sock, ret_code); |
876 | if (ret < 0) { | |
877 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 878 | goto error_fatal; |
f50f23d9 | 879 | } |
3f8e211f | 880 | |
3f8e211f | 881 | goto end_nosignal; |
3bd1e081 | 882 | } |
6d805429 | 883 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 884 | { |
c8f59ee5 | 885 | int32_t ret; |
6d805429 | 886 | uint64_t id = msg.u.data_pending.session_id; |
c8f59ee5 | 887 | |
6d805429 | 888 | DBG("Kernel consumer data pending command for id %" PRIu64, id); |
c8f59ee5 | 889 | |
6d805429 | 890 | ret = consumer_data_pending(id); |
c8f59ee5 | 891 | |
9ce5646a MD |
892 | health_code_update(); |
893 | ||
c8f59ee5 DG |
894 | /* Send back returned value to session daemon */ |
895 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
896 | if (ret < 0) { | |
6d805429 | 897 | PERROR("send data pending ret code"); |
1803a064 | 898 | goto error_fatal; |
c8f59ee5 | 899 | } |
f50f23d9 DG |
900 | |
901 | /* | |
902 | * No need to send back a status message since the data pending | |
903 | * returned value is the response. | |
904 | */ | |
c8f59ee5 | 905 | break; |
53632229 | 906 | } |
6dc3064a DG |
907 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
908 | { | |
07b86b52 JD |
909 | if (msg.u.snapshot_channel.metadata == 1) { |
910 | ret = lttng_kconsumer_snapshot_metadata(msg.u.snapshot_channel.key, | |
e2039c7a JD |
911 | msg.u.snapshot_channel.pathname, |
912 | msg.u.snapshot_channel.relayd_id, ctx); | |
07b86b52 JD |
913 | if (ret < 0) { |
914 | ERR("Snapshot metadata failed"); | |
e462382a | 915 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; |
07b86b52 JD |
916 | } |
917 | } else { | |
918 | ret = lttng_kconsumer_snapshot_channel(msg.u.snapshot_channel.key, | |
919 | msg.u.snapshot_channel.pathname, | |
5c786ded | 920 | msg.u.snapshot_channel.relayd_id, |
d07ceecd | 921 | msg.u.snapshot_channel.nb_packets_per_stream, |
5c786ded | 922 | ctx); |
07b86b52 JD |
923 | if (ret < 0) { |
924 | ERR("Snapshot channel failed"); | |
e462382a | 925 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
07b86b52 JD |
926 | } |
927 | } | |
928 | ||
9ce5646a MD |
929 | health_code_update(); |
930 | ||
6dc3064a DG |
931 | ret = consumer_send_status_msg(sock, ret_code); |
932 | if (ret < 0) { | |
933 | /* Somehow, the session daemon is not responding anymore. */ | |
934 | goto end_nosignal; | |
935 | } | |
936 | break; | |
937 | } | |
07b86b52 JD |
938 | case LTTNG_CONSUMER_DESTROY_CHANNEL: |
939 | { | |
940 | uint64_t key = msg.u.destroy_channel.key; | |
941 | struct lttng_consumer_channel *channel; | |
942 | ||
943 | channel = consumer_find_channel(key); | |
944 | if (!channel) { | |
945 | ERR("Kernel consumer destroy channel %" PRIu64 " not found", key); | |
e462382a | 946 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
07b86b52 JD |
947 | } |
948 | ||
9ce5646a MD |
949 | health_code_update(); |
950 | ||
07b86b52 JD |
951 | ret = consumer_send_status_msg(sock, ret_code); |
952 | if (ret < 0) { | |
953 | /* Somehow, the session daemon is not responding anymore. */ | |
954 | goto end_nosignal; | |
955 | } | |
956 | ||
9ce5646a MD |
957 | health_code_update(); |
958 | ||
15dc512a DG |
959 | /* Stop right now if no channel was found. */ |
960 | if (!channel) { | |
961 | goto end_nosignal; | |
962 | } | |
963 | ||
07b86b52 JD |
964 | /* |
965 | * This command should ONLY be issued for channel with streams set in | |
966 | * no monitor mode. | |
967 | */ | |
968 | assert(!channel->monitor); | |
969 | ||
970 | /* | |
971 | * The refcount should ALWAYS be 0 in the case of a channel in no | |
972 | * monitor mode. | |
973 | */ | |
974 | assert(!uatomic_sub_return(&channel->refcount, 1)); | |
975 | ||
976 | consumer_del_channel(channel); | |
977 | ||
978 | goto end_nosignal; | |
979 | } | |
fb83fe64 JD |
980 | case LTTNG_CONSUMER_DISCARDED_EVENTS: |
981 | { | |
982 | uint64_t ret; | |
983 | struct lttng_consumer_channel *channel; | |
984 | uint64_t id = msg.u.discarded_events.session_id; | |
985 | uint64_t key = msg.u.discarded_events.channel_key; | |
986 | ||
e5742757 MD |
987 | DBG("Kernel consumer discarded events command for session id %" |
988 | PRIu64 ", channel key %" PRIu64, id, key); | |
989 | ||
fb83fe64 JD |
990 | channel = consumer_find_channel(key); |
991 | if (!channel) { | |
992 | ERR("Kernel consumer discarded events channel %" | |
993 | PRIu64 " not found", key); | |
e5742757 MD |
994 | ret = 0; |
995 | } else { | |
996 | ret = channel->discarded_events; | |
fb83fe64 JD |
997 | } |
998 | ||
fb83fe64 JD |
999 | health_code_update(); |
1000 | ||
1001 | /* Send back returned value to session daemon */ | |
1002 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
1003 | if (ret < 0) { | |
1004 | PERROR("send discarded events"); | |
1005 | goto error_fatal; | |
1006 | } | |
1007 | ||
1008 | break; | |
1009 | } | |
1010 | case LTTNG_CONSUMER_LOST_PACKETS: | |
1011 | { | |
1012 | uint64_t ret; | |
1013 | struct lttng_consumer_channel *channel; | |
1014 | uint64_t id = msg.u.lost_packets.session_id; | |
1015 | uint64_t key = msg.u.lost_packets.channel_key; | |
1016 | ||
e5742757 MD |
1017 | DBG("Kernel consumer lost packets command for session id %" |
1018 | PRIu64 ", channel key %" PRIu64, id, key); | |
1019 | ||
fb83fe64 JD |
1020 | channel = consumer_find_channel(key); |
1021 | if (!channel) { | |
1022 | ERR("Kernel consumer lost packets channel %" | |
1023 | PRIu64 " not found", key); | |
e5742757 MD |
1024 | ret = 0; |
1025 | } else { | |
1026 | ret = channel->lost_packets; | |
fb83fe64 JD |
1027 | } |
1028 | ||
fb83fe64 JD |
1029 | health_code_update(); |
1030 | ||
1031 | /* Send back returned value to session daemon */ | |
1032 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
1033 | if (ret < 0) { | |
1034 | PERROR("send lost packets"); | |
1035 | goto error_fatal; | |
1036 | } | |
1037 | ||
1038 | break; | |
1039 | } | |
b3530820 JG |
1040 | case LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE: |
1041 | { | |
1042 | int channel_monitor_pipe; | |
1043 | ||
1044 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1045 | /* Successfully received the command's type. */ | |
1046 | ret = consumer_send_status_msg(sock, ret_code); | |
1047 | if (ret < 0) { | |
1048 | goto error_fatal; | |
1049 | } | |
1050 | ||
1051 | ret = lttcomm_recv_fds_unix_sock(sock, &channel_monitor_pipe, | |
1052 | 1); | |
1053 | if (ret != sizeof(channel_monitor_pipe)) { | |
1054 | ERR("Failed to receive channel monitor pipe"); | |
1055 | goto error_fatal; | |
1056 | } | |
1057 | ||
1058 | DBG("Received channel monitor pipe (%d)", channel_monitor_pipe); | |
1059 | ret = consumer_timer_thread_set_channel_monitor_pipe( | |
1060 | channel_monitor_pipe); | |
1061 | if (!ret) { | |
1062 | int flags; | |
1063 | ||
1064 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1065 | /* Set the pipe as non-blocking. */ | |
1066 | ret = fcntl(channel_monitor_pipe, F_GETFL, 0); | |
1067 | if (ret == -1) { | |
1068 | PERROR("fcntl get flags of the channel monitoring pipe"); | |
1069 | goto error_fatal; | |
1070 | } | |
1071 | flags = ret; | |
1072 | ||
1073 | ret = fcntl(channel_monitor_pipe, F_SETFL, | |
1074 | flags | O_NONBLOCK); | |
1075 | if (ret == -1) { | |
1076 | PERROR("fcntl set O_NONBLOCK flag of the channel monitoring pipe"); | |
1077 | goto error_fatal; | |
1078 | } | |
1079 | DBG("Channel monitor pipe set as non-blocking"); | |
1080 | } else { | |
1081 | ret_code = LTTCOMM_CONSUMERD_ALREADY_SET; | |
1082 | } | |
1083 | ret = consumer_send_status_msg(sock, ret_code); | |
1084 | if (ret < 0) { | |
1085 | goto error_fatal; | |
1086 | } | |
1087 | break; | |
1088 | } | |
3bd1e081 | 1089 | default: |
3f8e211f | 1090 | goto end_nosignal; |
3bd1e081 | 1091 | } |
3f8e211f | 1092 | |
3bd1e081 | 1093 | end_nosignal: |
b0b335c8 | 1094 | rcu_read_unlock(); |
4cbc1a04 DG |
1095 | |
1096 | /* | |
1097 | * Return 1 to indicate success since the 0 value can be a socket | |
1098 | * shutdown during the recv() or send() call. | |
1099 | */ | |
9ce5646a | 1100 | health_code_update(); |
4cbc1a04 | 1101 | return 1; |
1803a064 MD |
1102 | |
1103 | error_fatal: | |
1104 | rcu_read_unlock(); | |
1105 | /* This will issue a consumer stop. */ | |
1106 | return -1; | |
3bd1e081 | 1107 | } |
d41f73b7 | 1108 | |
309167d2 JD |
1109 | /* |
1110 | * Populate index values of a kernel stream. Values are set in big endian order. | |
1111 | * | |
1112 | * Return 0 on success or else a negative value. | |
1113 | */ | |
50adc264 | 1114 | static int get_index_values(struct ctf_packet_index *index, int infd) |
309167d2 JD |
1115 | { |
1116 | int ret; | |
1117 | ||
1118 | ret = kernctl_get_timestamp_begin(infd, &index->timestamp_begin); | |
1119 | if (ret < 0) { | |
1120 | PERROR("kernctl_get_timestamp_begin"); | |
1121 | goto error; | |
1122 | } | |
1123 | index->timestamp_begin = htobe64(index->timestamp_begin); | |
1124 | ||
1125 | ret = kernctl_get_timestamp_end(infd, &index->timestamp_end); | |
1126 | if (ret < 0) { | |
1127 | PERROR("kernctl_get_timestamp_end"); | |
1128 | goto error; | |
1129 | } | |
1130 | index->timestamp_end = htobe64(index->timestamp_end); | |
1131 | ||
1132 | ret = kernctl_get_events_discarded(infd, &index->events_discarded); | |
1133 | if (ret < 0) { | |
1134 | PERROR("kernctl_get_events_discarded"); | |
1135 | goto error; | |
1136 | } | |
1137 | index->events_discarded = htobe64(index->events_discarded); | |
1138 | ||
1139 | ret = kernctl_get_content_size(infd, &index->content_size); | |
1140 | if (ret < 0) { | |
1141 | PERROR("kernctl_get_content_size"); | |
1142 | goto error; | |
1143 | } | |
1144 | index->content_size = htobe64(index->content_size); | |
1145 | ||
1146 | ret = kernctl_get_packet_size(infd, &index->packet_size); | |
1147 | if (ret < 0) { | |
1148 | PERROR("kernctl_get_packet_size"); | |
1149 | goto error; | |
1150 | } | |
1151 | index->packet_size = htobe64(index->packet_size); | |
1152 | ||
1153 | ret = kernctl_get_stream_id(infd, &index->stream_id); | |
1154 | if (ret < 0) { | |
1155 | PERROR("kernctl_get_stream_id"); | |
1156 | goto error; | |
1157 | } | |
1158 | index->stream_id = htobe64(index->stream_id); | |
1159 | ||
234cd636 JD |
1160 | ret = kernctl_get_instance_id(infd, &index->stream_instance_id); |
1161 | if (ret < 0) { | |
f0b03c22 MD |
1162 | if (ret == -ENOTTY) { |
1163 | /* Command not implemented by lttng-modules. */ | |
1164 | index->stream_instance_id = -1ULL; | |
1165 | ret = 0; | |
1166 | } else { | |
1167 | PERROR("kernctl_get_instance_id"); | |
1168 | goto error; | |
1169 | } | |
234cd636 JD |
1170 | } |
1171 | index->stream_instance_id = htobe64(index->stream_instance_id); | |
1172 | ||
1173 | ret = kernctl_get_sequence_number(infd, &index->packet_seq_num); | |
1174 | if (ret < 0) { | |
f0b03c22 MD |
1175 | if (ret == -ENOTTY) { |
1176 | /* Command not implemented by lttng-modules. */ | |
1177 | index->packet_seq_num = -1ULL; | |
1178 | ret = 0; | |
1179 | } else { | |
1180 | PERROR("kernctl_get_sequence_number"); | |
1181 | goto error; | |
1182 | } | |
234cd636 JD |
1183 | } |
1184 | index->packet_seq_num = htobe64(index->packet_seq_num); | |
1185 | ||
309167d2 JD |
1186 | error: |
1187 | return ret; | |
1188 | } | |
94d49140 JD |
1189 | /* |
1190 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
1191 | * metadata thread can consumer them. | |
1192 | * | |
1193 | * Metadata stream lock MUST be acquired. | |
1194 | * | |
1195 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream | |
1196 | * is empty or a negative value on error. | |
1197 | */ | |
1198 | int lttng_kconsumer_sync_metadata(struct lttng_consumer_stream *metadata) | |
1199 | { | |
1200 | int ret; | |
1201 | ||
1202 | assert(metadata); | |
1203 | ||
1204 | ret = kernctl_buffer_flush(metadata->wait_fd); | |
1205 | if (ret < 0) { | |
1206 | ERR("Failed to flush kernel stream"); | |
1207 | goto end; | |
1208 | } | |
1209 | ||
1210 | ret = kernctl_snapshot(metadata->wait_fd); | |
1211 | if (ret < 0) { | |
32af2c95 | 1212 | if (ret != -EAGAIN) { |
94d49140 JD |
1213 | ERR("Sync metadata, taking kernel snapshot failed."); |
1214 | goto end; | |
1215 | } | |
1216 | DBG("Sync metadata, no new kernel metadata"); | |
1217 | /* No new metadata, exit. */ | |
1218 | ret = ENODATA; | |
1219 | goto end; | |
1220 | } | |
1221 | ||
1222 | end: | |
1223 | return ret; | |
1224 | } | |
309167d2 | 1225 | |
fb83fe64 JD |
1226 | static |
1227 | int update_stream_stats(struct lttng_consumer_stream *stream) | |
1228 | { | |
1229 | int ret; | |
1230 | uint64_t seq, discarded; | |
1231 | ||
1232 | ret = kernctl_get_sequence_number(stream->wait_fd, &seq); | |
1233 | if (ret < 0) { | |
f0b03c22 MD |
1234 | if (ret == -ENOTTY) { |
1235 | /* Command not implemented by lttng-modules. */ | |
1236 | seq = -1ULL; | |
1237 | ret = 0; | |
1238 | } else { | |
1239 | PERROR("kernctl_get_sequence_number"); | |
1240 | goto end; | |
1241 | } | |
fb83fe64 JD |
1242 | } |
1243 | ||
1244 | /* | |
1245 | * Start the sequence when we extract the first packet in case we don't | |
1246 | * start at 0 (for example if a consumer is not connected to the | |
1247 | * session immediately after the beginning). | |
1248 | */ | |
1249 | if (stream->last_sequence_number == -1ULL) { | |
1250 | stream->last_sequence_number = seq; | |
1251 | } else if (seq > stream->last_sequence_number) { | |
1252 | stream->chan->lost_packets += seq - | |
1253 | stream->last_sequence_number - 1; | |
1254 | } else { | |
1255 | /* seq <= last_sequence_number */ | |
1256 | ERR("Sequence number inconsistent : prev = %" PRIu64 | |
1257 | ", current = %" PRIu64, | |
1258 | stream->last_sequence_number, seq); | |
1259 | ret = -1; | |
1260 | goto end; | |
1261 | } | |
1262 | stream->last_sequence_number = seq; | |
1263 | ||
1264 | ret = kernctl_get_events_discarded(stream->wait_fd, &discarded); | |
1265 | if (ret < 0) { | |
1266 | PERROR("kernctl_get_events_discarded"); | |
1267 | goto end; | |
1268 | } | |
1269 | if (discarded < stream->last_discarded_events) { | |
1270 | /* | |
83f4233d MJ |
1271 | * Overflow has occurred. We assume only one wrap-around |
1272 | * has occurred. | |
fb83fe64 JD |
1273 | */ |
1274 | stream->chan->discarded_events += (1ULL << (CAA_BITS_PER_LONG - 1)) - | |
1275 | stream->last_discarded_events + discarded; | |
1276 | } else { | |
1277 | stream->chan->discarded_events += discarded - | |
1278 | stream->last_discarded_events; | |
1279 | } | |
1280 | stream->last_discarded_events = discarded; | |
1281 | ret = 0; | |
1282 | ||
1283 | end: | |
1284 | return ret; | |
1285 | } | |
1286 | ||
93ec662e JD |
1287 | /* |
1288 | * Check if the local version of the metadata stream matches with the version | |
1289 | * of the metadata stream in the kernel. If it was updated, set the reset flag | |
1290 | * on the stream. | |
1291 | */ | |
1292 | static | |
1293 | int metadata_stream_check_version(int infd, struct lttng_consumer_stream *stream) | |
1294 | { | |
1295 | int ret; | |
1296 | uint64_t cur_version; | |
1297 | ||
1298 | ret = kernctl_get_metadata_version(infd, &cur_version); | |
1299 | if (ret < 0) { | |
f0b03c22 MD |
1300 | if (ret == -ENOTTY) { |
1301 | /* | |
1302 | * LTTng-modules does not implement this | |
1303 | * command. | |
1304 | */ | |
1305 | ret = 0; | |
1306 | goto end; | |
1307 | } | |
93ec662e JD |
1308 | ERR("Failed to get the metadata version"); |
1309 | goto end; | |
1310 | } | |
1311 | ||
1312 | if (stream->metadata_version == cur_version) { | |
1313 | ret = 0; | |
1314 | goto end; | |
1315 | } | |
1316 | ||
1317 | DBG("New metadata version detected"); | |
1318 | stream->metadata_version = cur_version; | |
1319 | stream->reset_metadata_flag = 1; | |
1320 | ret = 0; | |
1321 | ||
1322 | end: | |
1323 | return ret; | |
1324 | } | |
1325 | ||
d41f73b7 MD |
1326 | /* |
1327 | * Consume data on a file descriptor and write it on a trace file. | |
1328 | */ | |
4078b776 | 1329 | ssize_t lttng_kconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
1330 | struct lttng_consumer_local_data *ctx) |
1331 | { | |
1d4dfdef | 1332 | unsigned long len, subbuf_size, padding; |
1c20f0e2 | 1333 | int err, write_index = 1; |
4078b776 | 1334 | ssize_t ret = 0; |
d41f73b7 | 1335 | int infd = stream->wait_fd; |
50adc264 | 1336 | struct ctf_packet_index index; |
d41f73b7 MD |
1337 | |
1338 | DBG("In read_subbuffer (infd : %d)", infd); | |
309167d2 | 1339 | |
d41f73b7 MD |
1340 | /* Get the next subbuffer */ |
1341 | err = kernctl_get_next_subbuf(infd); | |
1342 | if (err != 0) { | |
d41f73b7 MD |
1343 | /* |
1344 | * This is a debug message even for single-threaded consumer, | |
1345 | * because poll() have more relaxed criterions than get subbuf, | |
1346 | * so get_subbuf may fail for short race windows where poll() | |
1347 | * would issue wakeups. | |
1348 | */ | |
1349 | DBG("Reserving sub buffer failed (everything is normal, " | |
1350 | "it is due to concurrency)"); | |
32af2c95 | 1351 | ret = err; |
d41f73b7 MD |
1352 | goto end; |
1353 | } | |
1354 | ||
1d4dfdef DG |
1355 | /* Get the full subbuffer size including padding */ |
1356 | err = kernctl_get_padded_subbuf_size(infd, &len); | |
1357 | if (err != 0) { | |
5a510c9f | 1358 | PERROR("Getting sub-buffer len failed."); |
8265f19e MD |
1359 | err = kernctl_put_subbuf(infd); |
1360 | if (err != 0) { | |
32af2c95 | 1361 | if (err == -EFAULT) { |
5a510c9f | 1362 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1363 | } else if (err == -EIO) { |
8265f19e | 1364 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1365 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e | 1366 | } |
32af2c95 | 1367 | ret = err; |
8265f19e MD |
1368 | goto end; |
1369 | } | |
32af2c95 | 1370 | ret = err; |
1d4dfdef DG |
1371 | goto end; |
1372 | } | |
1373 | ||
1c20f0e2 | 1374 | if (!stream->metadata_flag) { |
309167d2 JD |
1375 | ret = get_index_values(&index, infd); |
1376 | if (ret < 0) { | |
8265f19e MD |
1377 | err = kernctl_put_subbuf(infd); |
1378 | if (err != 0) { | |
32af2c95 | 1379 | if (err == -EFAULT) { |
5a510c9f | 1380 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1381 | } else if (err == -EIO) { |
8265f19e | 1382 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1383 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e | 1384 | } |
32af2c95 | 1385 | ret = err; |
8265f19e MD |
1386 | goto end; |
1387 | } | |
309167d2 JD |
1388 | goto end; |
1389 | } | |
fb83fe64 JD |
1390 | ret = update_stream_stats(stream); |
1391 | if (ret < 0) { | |
7b87473d MD |
1392 | err = kernctl_put_subbuf(infd); |
1393 | if (err != 0) { | |
1394 | if (err == -EFAULT) { | |
1395 | PERROR("Error in unreserving sub buffer\n"); | |
1396 | } else if (err == -EIO) { | |
1397 | /* Should never happen with newer LTTng versions */ | |
1398 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
1399 | } | |
1400 | ret = err; | |
1401 | goto end; | |
1402 | } | |
fb83fe64 JD |
1403 | goto end; |
1404 | } | |
1c20f0e2 JD |
1405 | } else { |
1406 | write_index = 0; | |
93ec662e JD |
1407 | ret = metadata_stream_check_version(infd, stream); |
1408 | if (ret < 0) { | |
7b87473d MD |
1409 | err = kernctl_put_subbuf(infd); |
1410 | if (err != 0) { | |
1411 | if (err == -EFAULT) { | |
1412 | PERROR("Error in unreserving sub buffer\n"); | |
1413 | } else if (err == -EIO) { | |
1414 | /* Should never happen with newer LTTng versions */ | |
1415 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
1416 | } | |
1417 | ret = err; | |
1418 | goto end; | |
1419 | } | |
93ec662e JD |
1420 | goto end; |
1421 | } | |
309167d2 JD |
1422 | } |
1423 | ||
ffe60014 | 1424 | switch (stream->chan->output) { |
07b86b52 | 1425 | case CONSUMER_CHANNEL_SPLICE: |
1d4dfdef DG |
1426 | /* |
1427 | * XXX: The lttng-modules splice "actor" does not handle copying | |
1428 | * partial pages hence only using the subbuffer size without the | |
1429 | * padding makes the splice fail. | |
1430 | */ | |
1431 | subbuf_size = len; | |
1432 | padding = 0; | |
1433 | ||
1434 | /* splice the subbuffer to the tracefile */ | |
91dfef6e | 1435 | ret = lttng_consumer_on_read_subbuffer_splice(ctx, stream, subbuf_size, |
309167d2 | 1436 | padding, &index); |
91dfef6e DG |
1437 | /* |
1438 | * XXX: Splice does not support network streaming so the return value | |
1439 | * is simply checked against subbuf_size and not like the mmap() op. | |
1440 | */ | |
1d4dfdef DG |
1441 | if (ret != subbuf_size) { |
1442 | /* | |
1443 | * display the error but continue processing to try | |
1444 | * to release the subbuffer | |
1445 | */ | |
1446 | ERR("Error splicing to tracefile (ret: %zd != len: %lu)", | |
1447 | ret, subbuf_size); | |
309167d2 | 1448 | write_index = 0; |
1d4dfdef DG |
1449 | } |
1450 | break; | |
07b86b52 | 1451 | case CONSUMER_CHANNEL_MMAP: |
1d4dfdef DG |
1452 | /* Get subbuffer size without padding */ |
1453 | err = kernctl_get_subbuf_size(infd, &subbuf_size); | |
1454 | if (err != 0) { | |
5a510c9f | 1455 | PERROR("Getting sub-buffer len failed."); |
8265f19e MD |
1456 | err = kernctl_put_subbuf(infd); |
1457 | if (err != 0) { | |
32af2c95 | 1458 | if (err == -EFAULT) { |
5a510c9f | 1459 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1460 | } else if (err == -EIO) { |
8265f19e | 1461 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1462 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e | 1463 | } |
32af2c95 | 1464 | ret = err; |
8265f19e MD |
1465 | goto end; |
1466 | } | |
32af2c95 | 1467 | ret = err; |
1d4dfdef DG |
1468 | goto end; |
1469 | } | |
47e81c02 | 1470 | |
1d4dfdef DG |
1471 | /* Make sure the tracer is not gone mad on us! */ |
1472 | assert(len >= subbuf_size); | |
1473 | ||
1474 | padding = len - subbuf_size; | |
1475 | ||
1476 | /* write the subbuffer to the tracefile */ | |
91dfef6e | 1477 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, |
309167d2 | 1478 | padding, &index); |
91dfef6e DG |
1479 | /* |
1480 | * The mmap operation should write subbuf_size amount of data when | |
1481 | * network streaming or the full padding (len) size when we are _not_ | |
1482 | * streaming. | |
1483 | */ | |
d88aee68 DG |
1484 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
1485 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
1d4dfdef | 1486 | /* |
91dfef6e | 1487 | * Display the error but continue processing to try to release the |
2336629e DG |
1488 | * subbuffer. This is a DBG statement since this is possible to |
1489 | * happen without being a critical error. | |
1d4dfdef | 1490 | */ |
2336629e | 1491 | DBG("Error writing to tracefile " |
91dfef6e DG |
1492 | "(ret: %zd != len: %lu != subbuf_size: %lu)", |
1493 | ret, len, subbuf_size); | |
309167d2 | 1494 | write_index = 0; |
1d4dfdef DG |
1495 | } |
1496 | break; | |
1497 | default: | |
1498 | ERR("Unknown output method"); | |
56591bac | 1499 | ret = -EPERM; |
d41f73b7 MD |
1500 | } |
1501 | ||
1502 | err = kernctl_put_next_subbuf(infd); | |
1503 | if (err != 0) { | |
32af2c95 | 1504 | if (err == -EFAULT) { |
5a510c9f | 1505 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1506 | } else if (err == -EIO) { |
d41f73b7 | 1507 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1508 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
d41f73b7 | 1509 | } |
32af2c95 | 1510 | ret = err; |
d41f73b7 MD |
1511 | goto end; |
1512 | } | |
1513 | ||
309167d2 | 1514 | /* Write index if needed. */ |
1c20f0e2 JD |
1515 | if (!write_index) { |
1516 | goto end; | |
1517 | } | |
1518 | ||
94d49140 JD |
1519 | if (stream->chan->live_timer_interval && !stream->metadata_flag) { |
1520 | /* | |
1521 | * In live, block until all the metadata is sent. | |
1522 | */ | |
c585821b MD |
1523 | pthread_mutex_lock(&stream->metadata_timer_lock); |
1524 | assert(!stream->missed_metadata_flush); | |
1525 | stream->waiting_on_metadata = true; | |
1526 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1527 | ||
94d49140 | 1528 | err = consumer_stream_sync_metadata(ctx, stream->session_id); |
c585821b MD |
1529 | |
1530 | pthread_mutex_lock(&stream->metadata_timer_lock); | |
1531 | stream->waiting_on_metadata = false; | |
1532 | if (stream->missed_metadata_flush) { | |
1533 | stream->missed_metadata_flush = false; | |
1534 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1535 | (void) consumer_flush_kernel_index(stream); | |
1536 | } else { | |
1537 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1538 | } | |
94d49140 JD |
1539 | if (err < 0) { |
1540 | goto end; | |
1541 | } | |
1542 | } | |
1543 | ||
1c20f0e2 JD |
1544 | err = consumer_stream_write_index(stream, &index); |
1545 | if (err < 0) { | |
1546 | goto end; | |
309167d2 JD |
1547 | } |
1548 | ||
d41f73b7 MD |
1549 | end: |
1550 | return ret; | |
1551 | } | |
1552 | ||
1553 | int lttng_kconsumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
1554 | { | |
1555 | int ret; | |
ffe60014 DG |
1556 | |
1557 | assert(stream); | |
1558 | ||
2bba9e53 DG |
1559 | /* |
1560 | * Don't create anything if this is set for streaming or should not be | |
1561 | * monitored. | |
1562 | */ | |
1563 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { | |
fe4477ee JD |
1564 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
1565 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
309167d2 | 1566 | stream->uid, stream->gid, NULL); |
fe4477ee JD |
1567 | if (ret < 0) { |
1568 | goto error; | |
1569 | } | |
1570 | stream->out_fd = ret; | |
1571 | stream->tracefile_size_current = 0; | |
309167d2 JD |
1572 | |
1573 | if (!stream->metadata_flag) { | |
f8f3885c MD |
1574 | struct lttng_index_file *index_file; |
1575 | ||
1576 | index_file = lttng_index_file_create(stream->chan->pathname, | |
309167d2 JD |
1577 | stream->name, stream->uid, stream->gid, |
1578 | stream->chan->tracefile_size, | |
f8f3885c MD |
1579 | stream->tracefile_count_current, |
1580 | CTF_INDEX_MAJOR, CTF_INDEX_MINOR); | |
1581 | if (!index_file) { | |
309167d2 JD |
1582 | goto error; |
1583 | } | |
1b47ae58 | 1584 | assert(!stream->index_file); |
f8f3885c | 1585 | stream->index_file = index_file; |
309167d2 | 1586 | } |
ffe60014 | 1587 | } |
d41f73b7 | 1588 | |
d41f73b7 MD |
1589 | if (stream->output == LTTNG_EVENT_MMAP) { |
1590 | /* get the len of the mmap region */ | |
1591 | unsigned long mmap_len; | |
1592 | ||
1593 | ret = kernctl_get_mmap_len(stream->wait_fd, &mmap_len); | |
1594 | if (ret != 0) { | |
ffe60014 | 1595 | PERROR("kernctl_get_mmap_len"); |
d41f73b7 MD |
1596 | goto error_close_fd; |
1597 | } | |
1598 | stream->mmap_len = (size_t) mmap_len; | |
1599 | ||
ffe60014 DG |
1600 | stream->mmap_base = mmap(NULL, stream->mmap_len, PROT_READ, |
1601 | MAP_PRIVATE, stream->wait_fd, 0); | |
d41f73b7 | 1602 | if (stream->mmap_base == MAP_FAILED) { |
ffe60014 | 1603 | PERROR("Error mmaping"); |
d41f73b7 MD |
1604 | ret = -1; |
1605 | goto error_close_fd; | |
1606 | } | |
1607 | } | |
1608 | ||
1609 | /* we return 0 to let the library handle the FD internally */ | |
1610 | return 0; | |
1611 | ||
1612 | error_close_fd: | |
2f225ce2 | 1613 | if (stream->out_fd >= 0) { |
d41f73b7 MD |
1614 | int err; |
1615 | ||
1616 | err = close(stream->out_fd); | |
1617 | assert(!err); | |
2f225ce2 | 1618 | stream->out_fd = -1; |
d41f73b7 MD |
1619 | } |
1620 | error: | |
1621 | return ret; | |
1622 | } | |
1623 | ||
ca22feea DG |
1624 | /* |
1625 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
1626 | * stream. Consumer data lock MUST be acquired before calling this function |
1627 | * and the stream lock. | |
ca22feea | 1628 | * |
6d805429 | 1629 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
1630 | * data is available for trace viewer reading. |
1631 | */ | |
6d805429 | 1632 | int lttng_kconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
1633 | { |
1634 | int ret; | |
1635 | ||
1636 | assert(stream); | |
1637 | ||
873b9e9a MD |
1638 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
1639 | ret = 0; | |
1640 | goto end; | |
1641 | } | |
1642 | ||
ca22feea DG |
1643 | ret = kernctl_get_next_subbuf(stream->wait_fd); |
1644 | if (ret == 0) { | |
1645 | /* There is still data so let's put back this subbuffer. */ | |
1646 | ret = kernctl_put_subbuf(stream->wait_fd); | |
1647 | assert(ret == 0); | |
6d805429 | 1648 | ret = 1; /* Data is pending */ |
4e9a4686 | 1649 | goto end; |
ca22feea DG |
1650 | } |
1651 | ||
6d805429 DG |
1652 | /* Data is NOT pending and ready to be read. */ |
1653 | ret = 0; | |
ca22feea | 1654 | |
6efae65e DG |
1655 | end: |
1656 | return ret; | |
ca22feea | 1657 | } |