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 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
3bd1e081 | 20 | #include <assert.h> |
3bd1e081 MD |
21 | #include <poll.h> |
22 | #include <pthread.h> | |
23 | #include <stdlib.h> | |
24 | #include <string.h> | |
25 | #include <sys/mman.h> | |
26 | #include <sys/socket.h> | |
27 | #include <sys/types.h> | |
77c7c900 | 28 | #include <inttypes.h> |
3bd1e081 | 29 | #include <unistd.h> |
dbb5dfe6 | 30 | #include <sys/stat.h> |
3bd1e081 | 31 | |
51a9e1c7 | 32 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 33 | #include <common/common.h> |
10a8a223 | 34 | #include <common/kernel-ctl/kernel-ctl.h> |
10a8a223 | 35 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 36 | #include <common/sessiond-comm/relayd.h> |
dbb5dfe6 | 37 | #include <common/compat/fcntl.h> |
f263b7fd | 38 | #include <common/compat/endian.h> |
acdb9057 | 39 | #include <common/pipe.h> |
00e2e675 | 40 | #include <common/relayd/relayd.h> |
fe4477ee | 41 | #include <common/utils.h> |
c8fea79c | 42 | #include <common/consumer/consumer-stream.h> |
309167d2 | 43 | #include <common/index/index.h> |
c8fea79c | 44 | #include <common/consumer/consumer-timer.h> |
0857097f | 45 | |
10a8a223 | 46 | #include "kernel-consumer.h" |
3bd1e081 MD |
47 | |
48 | extern struct lttng_consumer_global_data consumer_data; | |
49 | extern int consumer_poll_timeout; | |
50 | extern volatile int consumer_quit; | |
51 | ||
3bd1e081 MD |
52 | /* |
53 | * Take a snapshot for a specific fd | |
54 | * | |
55 | * Returns 0 on success, < 0 on error | |
56 | */ | |
ffe60014 | 57 | int lttng_kconsumer_take_snapshot(struct lttng_consumer_stream *stream) |
3bd1e081 MD |
58 | { |
59 | int ret = 0; | |
60 | int infd = stream->wait_fd; | |
61 | ||
62 | ret = kernctl_snapshot(infd); | |
63 | if (ret != 0) { | |
5a510c9f | 64 | PERROR("Getting sub-buffer snapshot."); |
56591bac | 65 | ret = -errno; |
3bd1e081 MD |
66 | } |
67 | ||
68 | return ret; | |
69 | } | |
70 | ||
71 | /* | |
72 | * Get the produced position | |
73 | * | |
74 | * Returns 0 on success, < 0 on error | |
75 | */ | |
ffe60014 | 76 | int lttng_kconsumer_get_produced_snapshot(struct lttng_consumer_stream *stream, |
3bd1e081 MD |
77 | unsigned long *pos) |
78 | { | |
79 | int ret; | |
80 | int infd = stream->wait_fd; | |
81 | ||
82 | ret = kernctl_snapshot_get_produced(infd, pos); | |
83 | if (ret != 0) { | |
5a510c9f | 84 | PERROR("kernctl_snapshot_get_produced"); |
56591bac | 85 | ret = -errno; |
3bd1e081 MD |
86 | } |
87 | ||
88 | return ret; | |
89 | } | |
90 | ||
07b86b52 JD |
91 | /* |
92 | * Get the consumerd position | |
93 | * | |
94 | * Returns 0 on success, < 0 on error | |
95 | */ | |
96 | int lttng_kconsumer_get_consumed_snapshot(struct lttng_consumer_stream *stream, | |
97 | unsigned long *pos) | |
98 | { | |
99 | int ret; | |
100 | int infd = stream->wait_fd; | |
101 | ||
102 | ret = kernctl_snapshot_get_consumed(infd, pos); | |
103 | if (ret != 0) { | |
5a510c9f | 104 | PERROR("kernctl_snapshot_get_consumed"); |
56591bac | 105 | ret = -errno; |
07b86b52 JD |
106 | } |
107 | ||
108 | return ret; | |
109 | } | |
110 | ||
07b86b52 JD |
111 | /* |
112 | * Take a snapshot of all the stream of a channel | |
113 | * | |
114 | * Returns 0 on success, < 0 on error | |
115 | */ | |
116 | int lttng_kconsumer_snapshot_channel(uint64_t key, char *path, | |
d07ceecd | 117 | uint64_t relayd_id, uint64_t nb_packets_per_stream, |
5c786ded | 118 | struct lttng_consumer_local_data *ctx) |
07b86b52 JD |
119 | { |
120 | int ret; | |
07b86b52 JD |
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) { |
c13082a9 JD |
143 | /* Are we at a position _before_ the first available packet ? */ |
144 | bool before_first_packet = true; | |
9ffd0032 | 145 | unsigned long consumed_pos, produced_pos; |
9ce5646a MD |
146 | |
147 | health_code_update(); | |
148 | ||
07b86b52 JD |
149 | /* |
150 | * Lock stream because we are about to change its state. | |
151 | */ | |
152 | pthread_mutex_lock(&stream->lock); | |
153 | ||
29decac3 DG |
154 | /* |
155 | * Assign the received relayd ID so we can use it for streaming. The streams | |
156 | * are not visible to anyone so this is OK to change it. | |
157 | */ | |
07b86b52 JD |
158 | stream->net_seq_idx = relayd_id; |
159 | channel->relayd_id = relayd_id; | |
160 | if (relayd_id != (uint64_t) -1ULL) { | |
10a50311 | 161 | ret = consumer_send_relayd_stream(stream, path); |
07b86b52 JD |
162 | if (ret < 0) { |
163 | ERR("sending stream to relayd"); | |
164 | goto end_unlock; | |
165 | } | |
07b86b52 JD |
166 | } else { |
167 | ret = utils_create_stream_file(path, stream->name, | |
10a50311 JD |
168 | stream->chan->tracefile_size, |
169 | stream->tracefile_count_current, | |
309167d2 | 170 | stream->uid, stream->gid, NULL); |
07b86b52 JD |
171 | if (ret < 0) { |
172 | ERR("utils_create_stream_file"); | |
173 | goto end_unlock; | |
174 | } | |
175 | ||
176 | stream->out_fd = ret; | |
177 | stream->tracefile_size_current = 0; | |
178 | ||
81ea21bf MD |
179 | DBG("Kernel consumer snapshot stream %s/%s (%" PRIu64 ")", |
180 | path, stream->name, stream->key); | |
07b86b52 | 181 | } |
601262d6 JD |
182 | if (relayd_id != -1ULL) { |
183 | ret = consumer_send_relayd_streams_sent(relayd_id); | |
184 | if (ret < 0) { | |
185 | ERR("sending streams sent to relayd"); | |
186 | goto end_unlock; | |
187 | } | |
7881b1c4 | 188 | channel->streams_sent_to_relayd = true; |
a4baae1b | 189 | } |
07b86b52 JD |
190 | |
191 | ret = kernctl_buffer_flush(stream->wait_fd); | |
192 | if (ret < 0) { | |
10a50311 | 193 | ERR("Failed to flush kernel stream"); |
56591bac | 194 | ret = -errno; |
07b86b52 JD |
195 | goto end_unlock; |
196 | } | |
197 | ||
198 | ret = lttng_kconsumer_take_snapshot(stream); | |
199 | if (ret < 0) { | |
200 | ERR("Taking kernel snapshot"); | |
201 | goto end_unlock; | |
202 | } | |
203 | ||
204 | ret = lttng_kconsumer_get_produced_snapshot(stream, &produced_pos); | |
205 | if (ret < 0) { | |
206 | ERR("Produced kernel snapshot position"); | |
207 | goto end_unlock; | |
208 | } | |
209 | ||
210 | ret = lttng_kconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
211 | if (ret < 0) { | |
212 | ERR("Consumerd kernel snapshot position"); | |
213 | goto end_unlock; | |
214 | } | |
215 | ||
216 | if (stream->max_sb_size == 0) { | |
217 | ret = kernctl_get_max_subbuf_size(stream->wait_fd, | |
218 | &stream->max_sb_size); | |
219 | if (ret < 0) { | |
220 | ERR("Getting kernel max_sb_size"); | |
56591bac | 221 | ret = -errno; |
07b86b52 JD |
222 | goto end_unlock; |
223 | } | |
224 | } | |
225 | ||
d07ceecd MD |
226 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
227 | produced_pos, nb_packets_per_stream, | |
228 | stream->max_sb_size); | |
5c786ded | 229 | |
07b86b52 JD |
230 | while (consumed_pos < produced_pos) { |
231 | ssize_t read_len; | |
232 | unsigned long len, padded_len; | |
c13082a9 | 233 | int lost_packet = 0; |
07b86b52 | 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; | |
c13082a9 JD |
248 | |
249 | /* | |
250 | * Start accounting lost packets only when we | |
251 | * already have extracted packets (to match the | |
252 | * content of the final snapshot). | |
253 | */ | |
254 | if (!before_first_packet) { | |
255 | lost_packet = 1; | |
256 | } | |
07b86b52 JD |
257 | continue; |
258 | } | |
259 | ||
260 | ret = kernctl_get_subbuf_size(stream->wait_fd, &len); | |
261 | if (ret < 0) { | |
262 | ERR("Snapshot kernctl_get_subbuf_size"); | |
56591bac | 263 | ret = -errno; |
29decac3 | 264 | goto error_put_subbuf; |
07b86b52 JD |
265 | } |
266 | ||
267 | ret = kernctl_get_padded_subbuf_size(stream->wait_fd, &padded_len); | |
268 | if (ret < 0) { | |
269 | ERR("Snapshot kernctl_get_padded_subbuf_size"); | |
56591bac | 270 | ret = -errno; |
29decac3 | 271 | goto error_put_subbuf; |
07b86b52 JD |
272 | } |
273 | ||
274 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
309167d2 | 275 | padded_len - len, NULL); |
07b86b52 | 276 | /* |
29decac3 DG |
277 | * We write the padded len in local tracefiles but the data len |
278 | * when using a relay. Display the error but continue processing | |
279 | * to try to release the subbuffer. | |
07b86b52 JD |
280 | */ |
281 | if (relayd_id != (uint64_t) -1ULL) { | |
282 | if (read_len != len) { | |
283 | ERR("Error sending to the relay (ret: %zd != len: %lu)", | |
284 | read_len, len); | |
285 | } | |
286 | } else { | |
287 | if (read_len != padded_len) { | |
288 | ERR("Error writing to tracefile (ret: %zd != len: %lu)", | |
289 | read_len, padded_len); | |
290 | } | |
291 | } | |
292 | ||
293 | ret = kernctl_put_subbuf(stream->wait_fd); | |
294 | if (ret < 0) { | |
295 | ERR("Snapshot kernctl_put_subbuf"); | |
56591bac | 296 | ret = -errno; |
07b86b52 JD |
297 | goto end_unlock; |
298 | } | |
299 | consumed_pos += stream->max_sb_size; | |
c13082a9 JD |
300 | |
301 | /* | |
302 | * Only account lost packets located between | |
303 | * succesfully extracted packets (do not account before | |
304 | * and after since they are not visible in the | |
305 | * resulting snapshot). | |
306 | */ | |
307 | stream->chan->lost_packets += lost_packet; | |
308 | lost_packet = 0; | |
309 | before_first_packet = false; | |
07b86b52 JD |
310 | } |
311 | ||
312 | if (relayd_id == (uint64_t) -1ULL) { | |
fdf9986c MD |
313 | if (stream->out_fd >= 0) { |
314 | ret = close(stream->out_fd); | |
315 | if (ret < 0) { | |
316 | PERROR("Kernel consumer snapshot close out_fd"); | |
317 | goto end_unlock; | |
318 | } | |
319 | stream->out_fd = -1; | |
07b86b52 | 320 | } |
07b86b52 JD |
321 | } else { |
322 | close_relayd_stream(stream); | |
323 | stream->net_seq_idx = (uint64_t) -1ULL; | |
324 | } | |
325 | pthread_mutex_unlock(&stream->lock); | |
326 | } | |
327 | ||
328 | /* All good! */ | |
329 | ret = 0; | |
330 | goto end; | |
331 | ||
29decac3 DG |
332 | error_put_subbuf: |
333 | ret = kernctl_put_subbuf(stream->wait_fd); | |
334 | if (ret < 0) { | |
56591bac | 335 | ret = -errno; |
29decac3 DG |
336 | ERR("Snapshot kernctl_put_subbuf error path"); |
337 | } | |
07b86b52 JD |
338 | end_unlock: |
339 | pthread_mutex_unlock(&stream->lock); | |
340 | end: | |
341 | rcu_read_unlock(); | |
342 | return ret; | |
343 | } | |
344 | ||
345 | /* | |
346 | * Read the whole metadata available for a snapshot. | |
347 | * | |
348 | * Returns 0 on success, < 0 on error | |
349 | */ | |
350 | int lttng_kconsumer_snapshot_metadata(uint64_t key, char *path, | |
e2039c7a | 351 | uint64_t relayd_id, struct lttng_consumer_local_data *ctx) |
07b86b52 | 352 | { |
d771f832 DG |
353 | int ret, use_relayd = 0; |
354 | ssize_t ret_read; | |
07b86b52 JD |
355 | struct lttng_consumer_channel *metadata_channel; |
356 | struct lttng_consumer_stream *metadata_stream; | |
d771f832 DG |
357 | |
358 | assert(ctx); | |
07b86b52 JD |
359 | |
360 | DBG("Kernel consumer snapshot metadata with key %" PRIu64 " at path %s", | |
361 | key, path); | |
362 | ||
363 | rcu_read_lock(); | |
364 | ||
365 | metadata_channel = consumer_find_channel(key); | |
366 | if (!metadata_channel) { | |
d771f832 | 367 | ERR("Kernel snapshot metadata not found for key %" PRIu64, key); |
07b86b52 | 368 | ret = -1; |
d771f832 | 369 | goto error; |
07b86b52 JD |
370 | } |
371 | ||
372 | metadata_stream = metadata_channel->metadata_stream; | |
373 | assert(metadata_stream); | |
374 | ||
d771f832 | 375 | /* Flag once that we have a valid relayd for the stream. */ |
e2039c7a | 376 | if (relayd_id != (uint64_t) -1ULL) { |
d771f832 DG |
377 | use_relayd = 1; |
378 | } | |
379 | ||
380 | if (use_relayd) { | |
10a50311 | 381 | ret = consumer_send_relayd_stream(metadata_stream, path); |
e2039c7a | 382 | if (ret < 0) { |
d771f832 | 383 | goto error; |
e2039c7a | 384 | } |
e2039c7a JD |
385 | } else { |
386 | ret = utils_create_stream_file(path, metadata_stream->name, | |
387 | metadata_stream->chan->tracefile_size, | |
388 | metadata_stream->tracefile_count_current, | |
309167d2 | 389 | metadata_stream->uid, metadata_stream->gid, NULL); |
e2039c7a | 390 | if (ret < 0) { |
d771f832 | 391 | goto error; |
e2039c7a JD |
392 | } |
393 | metadata_stream->out_fd = ret; | |
07b86b52 | 394 | } |
07b86b52 | 395 | |
d771f832 | 396 | do { |
9ce5646a MD |
397 | health_code_update(); |
398 | ||
d771f832 DG |
399 | ret_read = lttng_kconsumer_read_subbuffer(metadata_stream, ctx); |
400 | if (ret_read < 0) { | |
56591bac | 401 | if (ret_read != -EAGAIN) { |
6a00837f | 402 | ERR("Kernel snapshot reading metadata subbuffer (ret: %zd)", |
d771f832 DG |
403 | ret_read); |
404 | goto error; | |
07b86b52 | 405 | } |
d771f832 | 406 | /* ret_read is negative at this point so we will exit the loop. */ |
07b86b52 JD |
407 | continue; |
408 | } | |
d771f832 | 409 | } while (ret_read >= 0); |
07b86b52 | 410 | |
d771f832 DG |
411 | if (use_relayd) { |
412 | close_relayd_stream(metadata_stream); | |
413 | metadata_stream->net_seq_idx = (uint64_t) -1ULL; | |
414 | } else { | |
fdf9986c MD |
415 | if (metadata_stream->out_fd >= 0) { |
416 | ret = close(metadata_stream->out_fd); | |
417 | if (ret < 0) { | |
418 | PERROR("Kernel consumer snapshot metadata close out_fd"); | |
419 | /* | |
420 | * Don't go on error here since the snapshot was successful at this | |
421 | * point but somehow the close failed. | |
422 | */ | |
423 | } | |
424 | metadata_stream->out_fd = -1; | |
e2039c7a | 425 | } |
e2039c7a JD |
426 | } |
427 | ||
07b86b52 | 428 | ret = 0; |
d771f832 | 429 | |
cf53a8a6 JD |
430 | cds_list_del(&metadata_stream->send_node); |
431 | consumer_stream_destroy(metadata_stream, NULL); | |
432 | metadata_channel->metadata_stream = NULL; | |
d771f832 | 433 | error: |
07b86b52 JD |
434 | rcu_read_unlock(); |
435 | return ret; | |
436 | } | |
437 | ||
1803a064 MD |
438 | /* |
439 | * Receive command from session daemon and process it. | |
440 | * | |
441 | * Return 1 on success else a negative value or 0. | |
442 | */ | |
3bd1e081 MD |
443 | int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
444 | int sock, struct pollfd *consumer_sockpoll) | |
445 | { | |
446 | ssize_t ret; | |
0c759fc9 | 447 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 MD |
448 | struct lttcomm_consumer_msg msg; |
449 | ||
9ce5646a MD |
450 | health_code_update(); |
451 | ||
3bd1e081 MD |
452 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
453 | if (ret != sizeof(msg)) { | |
1803a064 | 454 | if (ret > 0) { |
c6857fcf | 455 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
1803a064 MD |
456 | ret = -1; |
457 | } | |
3bd1e081 MD |
458 | return ret; |
459 | } | |
9ce5646a MD |
460 | |
461 | health_code_update(); | |
462 | ||
84382d49 MD |
463 | /* Deprecated command */ |
464 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 465 | |
9ce5646a MD |
466 | health_code_update(); |
467 | ||
b0b335c8 MD |
468 | /* relayd needs RCU read-side protection */ |
469 | rcu_read_lock(); | |
470 | ||
3bd1e081 | 471 | switch (msg.cmd_type) { |
00e2e675 DG |
472 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
473 | { | |
f50f23d9 | 474 | /* Session daemon status message are handled in the following call. */ |
7735ef9e DG |
475 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
476 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, | |
d3e2ba59 JD |
477 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
478 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
479 | goto end_nosignal; |
480 | } | |
3bd1e081 MD |
481 | case LTTNG_CONSUMER_ADD_CHANNEL: |
482 | { | |
483 | struct lttng_consumer_channel *new_channel; | |
e43c41c5 | 484 | int ret_recv; |
3bd1e081 | 485 | |
9ce5646a MD |
486 | health_code_update(); |
487 | ||
f50f23d9 DG |
488 | /* First send a status message before receiving the fds. */ |
489 | ret = consumer_send_status_msg(sock, ret_code); | |
490 | if (ret < 0) { | |
491 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 492 | goto error_fatal; |
f50f23d9 | 493 | } |
9ce5646a MD |
494 | |
495 | health_code_update(); | |
496 | ||
d88aee68 | 497 | DBG("consumer_add_channel %" PRIu64, msg.u.channel.channel_key); |
3bd1e081 | 498 | new_channel = consumer_allocate_channel(msg.u.channel.channel_key, |
ffe60014 DG |
499 | msg.u.channel.session_id, msg.u.channel.pathname, |
500 | msg.u.channel.name, msg.u.channel.uid, msg.u.channel.gid, | |
1624d5b7 JD |
501 | msg.u.channel.relayd_id, msg.u.channel.output, |
502 | msg.u.channel.tracefile_size, | |
1950109e | 503 | msg.u.channel.tracefile_count, 0, |
ecc48a90 | 504 | msg.u.channel.monitor, |
d7ba1388 | 505 | msg.u.channel.live_timer_interval, |
3d071855 | 506 | NULL, NULL); |
3bd1e081 | 507 | if (new_channel == NULL) { |
f73fabfd | 508 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
3bd1e081 MD |
509 | goto end_nosignal; |
510 | } | |
ffe60014 | 511 | new_channel->nb_init_stream_left = msg.u.channel.nb_init_streams; |
95a1109b JD |
512 | switch (msg.u.channel.output) { |
513 | case LTTNG_EVENT_SPLICE: | |
514 | new_channel->output = CONSUMER_CHANNEL_SPLICE; | |
515 | break; | |
516 | case LTTNG_EVENT_MMAP: | |
517 | new_channel->output = CONSUMER_CHANNEL_MMAP; | |
518 | break; | |
519 | default: | |
520 | ERR("Channel output unknown %d", msg.u.channel.output); | |
521 | goto end_nosignal; | |
522 | } | |
ffe60014 DG |
523 | |
524 | /* Translate and save channel type. */ | |
525 | switch (msg.u.channel.type) { | |
526 | case CONSUMER_CHANNEL_TYPE_DATA: | |
527 | case CONSUMER_CHANNEL_TYPE_METADATA: | |
528 | new_channel->type = msg.u.channel.type; | |
529 | break; | |
530 | default: | |
531 | assert(0); | |
532 | goto end_nosignal; | |
533 | }; | |
534 | ||
9ce5646a MD |
535 | health_code_update(); |
536 | ||
3bd1e081 | 537 | if (ctx->on_recv_channel != NULL) { |
e43c41c5 JD |
538 | ret_recv = ctx->on_recv_channel(new_channel); |
539 | if (ret_recv == 0) { | |
540 | ret = consumer_add_channel(new_channel, ctx); | |
541 | } else if (ret_recv < 0) { | |
3bd1e081 MD |
542 | goto end_nosignal; |
543 | } | |
544 | } else { | |
e43c41c5 | 545 | ret = consumer_add_channel(new_channel, ctx); |
3bd1e081 | 546 | } |
94d49140 JD |
547 | if (CONSUMER_CHANNEL_TYPE_DATA) { |
548 | consumer_timer_live_start(new_channel, | |
549 | msg.u.channel.live_timer_interval); | |
550 | } | |
e43c41c5 | 551 | |
9ce5646a MD |
552 | health_code_update(); |
553 | ||
e43c41c5 | 554 | /* If we received an error in add_channel, we need to report it. */ |
821fffb2 | 555 | if (ret < 0) { |
1803a064 MD |
556 | ret = consumer_send_status_msg(sock, ret); |
557 | if (ret < 0) { | |
558 | goto error_fatal; | |
559 | } | |
e43c41c5 JD |
560 | goto end_nosignal; |
561 | } | |
562 | ||
3bd1e081 MD |
563 | goto end_nosignal; |
564 | } | |
565 | case LTTNG_CONSUMER_ADD_STREAM: | |
566 | { | |
dae10966 DG |
567 | int fd; |
568 | struct lttng_pipe *stream_pipe; | |
00e2e675 | 569 | struct lttng_consumer_stream *new_stream; |
ffe60014 | 570 | struct lttng_consumer_channel *channel; |
c80048c6 | 571 | int alloc_ret = 0; |
3bd1e081 | 572 | |
ffe60014 DG |
573 | /* |
574 | * Get stream's channel reference. Needed when adding the stream to the | |
575 | * global hash table. | |
576 | */ | |
577 | channel = consumer_find_channel(msg.u.stream.channel_key); | |
578 | if (!channel) { | |
579 | /* | |
580 | * We could not find the channel. Can happen if cpu hotplug | |
581 | * happens while tearing down. | |
582 | */ | |
d88aee68 | 583 | ERR("Unable to find channel key %" PRIu64, msg.u.stream.channel_key); |
e462382a | 584 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
ffe60014 DG |
585 | } |
586 | ||
9ce5646a MD |
587 | health_code_update(); |
588 | ||
f50f23d9 DG |
589 | /* First send a status message before receiving the fds. */ |
590 | ret = consumer_send_status_msg(sock, ret_code); | |
1803a064 | 591 | if (ret < 0) { |
d771f832 | 592 | /* Somehow, the session daemon is not responding anymore. */ |
1803a064 MD |
593 | goto error_fatal; |
594 | } | |
9ce5646a MD |
595 | |
596 | health_code_update(); | |
597 | ||
0c759fc9 | 598 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
d771f832 | 599 | /* Channel was not found. */ |
f50f23d9 DG |
600 | goto end_nosignal; |
601 | } | |
602 | ||
d771f832 | 603 | /* Blocking call */ |
9ce5646a MD |
604 | health_poll_entry(); |
605 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
606 | health_poll_exit(); | |
84382d49 MD |
607 | if (ret) { |
608 | goto error_fatal; | |
3bd1e081 | 609 | } |
00e2e675 | 610 | |
9ce5646a MD |
611 | health_code_update(); |
612 | ||
00e2e675 | 613 | /* Get stream file descriptor from socket */ |
f2fc6720 MD |
614 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); |
615 | if (ret != sizeof(fd)) { | |
f73fabfd | 616 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
3f8e211f | 617 | rcu_read_unlock(); |
3bd1e081 MD |
618 | return ret; |
619 | } | |
3bd1e081 | 620 | |
9ce5646a MD |
621 | health_code_update(); |
622 | ||
f50f23d9 DG |
623 | /* |
624 | * Send status code to session daemon only if the recv works. If the | |
625 | * above recv() failed, the session daemon is notified through the | |
626 | * error socket and the teardown is eventually done. | |
627 | */ | |
628 | ret = consumer_send_status_msg(sock, ret_code); | |
629 | if (ret < 0) { | |
630 | /* Somehow, the session daemon is not responding anymore. */ | |
631 | goto end_nosignal; | |
632 | } | |
633 | ||
9ce5646a MD |
634 | health_code_update(); |
635 | ||
ffe60014 DG |
636 | new_stream = consumer_allocate_stream(channel->key, |
637 | fd, | |
638 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
639 | channel->name, | |
640 | channel->uid, | |
641 | channel->gid, | |
642 | channel->relayd_id, | |
643 | channel->session_id, | |
644 | msg.u.stream.cpu, | |
645 | &alloc_ret, | |
4891ece8 DG |
646 | channel->type, |
647 | channel->monitor); | |
3bd1e081 | 648 | if (new_stream == NULL) { |
c80048c6 MD |
649 | switch (alloc_ret) { |
650 | case -ENOMEM: | |
651 | case -EINVAL: | |
652 | default: | |
653 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
654 | break; | |
c80048c6 | 655 | } |
3f8e211f | 656 | goto end_nosignal; |
3bd1e081 | 657 | } |
d771f832 | 658 | |
ffe60014 DG |
659 | new_stream->chan = channel; |
660 | new_stream->wait_fd = fd; | |
07b86b52 JD |
661 | switch (channel->output) { |
662 | case CONSUMER_CHANNEL_SPLICE: | |
663 | new_stream->output = LTTNG_EVENT_SPLICE; | |
a2361a61 JD |
664 | ret = utils_create_pipe(new_stream->splice_pipe); |
665 | if (ret < 0) { | |
666 | goto end_nosignal; | |
667 | } | |
07b86b52 JD |
668 | break; |
669 | case CONSUMER_CHANNEL_MMAP: | |
670 | new_stream->output = LTTNG_EVENT_MMAP; | |
671 | break; | |
672 | default: | |
673 | ERR("Stream output unknown %d", channel->output); | |
674 | goto end_nosignal; | |
675 | } | |
00e2e675 | 676 | |
a0c83db9 DG |
677 | /* |
678 | * We've just assigned the channel to the stream so increment the | |
07b86b52 JD |
679 | * refcount right now. We don't need to increment the refcount for |
680 | * streams in no monitor because we handle manually the cleanup of | |
681 | * those. It is very important to make sure there is NO prior | |
682 | * consumer_del_stream() calls or else the refcount will be unbalanced. | |
a0c83db9 | 683 | */ |
07b86b52 JD |
684 | if (channel->monitor) { |
685 | uatomic_inc(&new_stream->chan->refcount); | |
686 | } | |
9d9353f9 | 687 | |
fb3a43a9 DG |
688 | /* |
689 | * The buffer flush is done on the session daemon side for the kernel | |
690 | * so no need for the stream "hangup_flush_done" variable to be | |
691 | * tracked. This is important for a kernel stream since we don't rely | |
692 | * on the flush state of the stream to read data. It's not the case for | |
693 | * user space tracing. | |
694 | */ | |
695 | new_stream->hangup_flush_done = 0; | |
696 | ||
9ce5646a MD |
697 | health_code_update(); |
698 | ||
633d0084 DG |
699 | if (ctx->on_recv_stream) { |
700 | ret = ctx->on_recv_stream(new_stream); | |
701 | if (ret < 0) { | |
d771f832 | 702 | consumer_stream_free(new_stream); |
633d0084 | 703 | goto end_nosignal; |
fb3a43a9 | 704 | } |
633d0084 | 705 | } |
fb3a43a9 | 706 | |
9ce5646a MD |
707 | health_code_update(); |
708 | ||
07b86b52 JD |
709 | if (new_stream->metadata_flag) { |
710 | channel->metadata_stream = new_stream; | |
711 | } | |
712 | ||
2bba9e53 DG |
713 | /* Do not monitor this stream. */ |
714 | if (!channel->monitor) { | |
5eecee74 | 715 | DBG("Kernel consumer add stream %s in no monitor mode with " |
6dc3064a | 716 | "relayd id %" PRIu64, new_stream->name, |
5eecee74 | 717 | new_stream->net_seq_idx); |
10a50311 | 718 | cds_list_add(&new_stream->send_node, &channel->streams.head); |
6dc3064a DG |
719 | break; |
720 | } | |
721 | ||
e1b71bdc DG |
722 | /* Send stream to relayd if the stream has an ID. */ |
723 | if (new_stream->net_seq_idx != (uint64_t) -1ULL) { | |
194ee077 DG |
724 | ret = consumer_send_relayd_stream(new_stream, |
725 | new_stream->chan->pathname); | |
e1b71bdc DG |
726 | if (ret < 0) { |
727 | consumer_stream_free(new_stream); | |
728 | goto end_nosignal; | |
729 | } | |
7881b1c4 MD |
730 | |
731 | /* | |
732 | * If adding an extra stream to an already | |
733 | * existing channel (e.g. cpu hotplug), we need | |
734 | * to send the "streams_sent" command to relayd. | |
735 | */ | |
736 | if (channel->streams_sent_to_relayd) { | |
737 | ret = consumer_send_relayd_streams_sent( | |
738 | new_stream->net_seq_idx); | |
739 | if (ret < 0) { | |
740 | goto end_nosignal; | |
741 | } | |
742 | } | |
e2039c7a JD |
743 | } |
744 | ||
50f8ae69 | 745 | /* Get the right pipe where the stream will be sent. */ |
633d0084 | 746 | if (new_stream->metadata_flag) { |
5ab66908 MD |
747 | ret = consumer_add_metadata_stream(new_stream); |
748 | if (ret) { | |
749 | ERR("Consumer add metadata stream %" PRIu64 " failed. Continuing", | |
750 | new_stream->key); | |
751 | consumer_stream_free(new_stream); | |
752 | goto end_nosignal; | |
753 | } | |
dae10966 | 754 | stream_pipe = ctx->consumer_metadata_pipe; |
3bd1e081 | 755 | } else { |
5ab66908 MD |
756 | ret = consumer_add_data_stream(new_stream); |
757 | if (ret) { | |
758 | ERR("Consumer add stream %" PRIu64 " failed. Continuing", | |
759 | new_stream->key); | |
760 | consumer_stream_free(new_stream); | |
761 | goto end_nosignal; | |
762 | } | |
dae10966 | 763 | stream_pipe = ctx->consumer_data_pipe; |
50f8ae69 DG |
764 | } |
765 | ||
5ab66908 MD |
766 | /* Vitible to other threads */ |
767 | new_stream->globally_visible = 1; | |
768 | ||
9ce5646a MD |
769 | health_code_update(); |
770 | ||
dae10966 | 771 | ret = lttng_pipe_write(stream_pipe, &new_stream, sizeof(new_stream)); |
50f8ae69 | 772 | if (ret < 0) { |
dae10966 | 773 | ERR("Consumer write %s stream to pipe %d", |
50f8ae69 | 774 | new_stream->metadata_flag ? "metadata" : "data", |
dae10966 | 775 | lttng_pipe_get_writefd(stream_pipe)); |
5ab66908 MD |
776 | if (new_stream->metadata_flag) { |
777 | consumer_del_stream_for_metadata(new_stream); | |
778 | } else { | |
779 | consumer_del_stream_for_data(new_stream); | |
780 | } | |
50f8ae69 | 781 | goto end_nosignal; |
3bd1e081 | 782 | } |
00e2e675 | 783 | |
50f8ae69 | 784 | DBG("Kernel consumer ADD_STREAM %s (fd: %d) with relayd id %" PRIu64, |
ffe60014 | 785 | new_stream->name, fd, new_stream->relayd_stream_id); |
3bd1e081 MD |
786 | break; |
787 | } | |
a4baae1b JD |
788 | case LTTNG_CONSUMER_STREAMS_SENT: |
789 | { | |
790 | struct lttng_consumer_channel *channel; | |
791 | ||
792 | /* | |
793 | * Get stream's channel reference. Needed when adding the stream to the | |
794 | * global hash table. | |
795 | */ | |
796 | channel = consumer_find_channel(msg.u.sent_streams.channel_key); | |
797 | if (!channel) { | |
798 | /* | |
799 | * We could not find the channel. Can happen if cpu hotplug | |
800 | * happens while tearing down. | |
801 | */ | |
802 | ERR("Unable to find channel key %" PRIu64, | |
803 | msg.u.sent_streams.channel_key); | |
e462382a | 804 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
a4baae1b JD |
805 | } |
806 | ||
807 | health_code_update(); | |
808 | ||
809 | /* | |
810 | * Send status code to session daemon. | |
811 | */ | |
812 | ret = consumer_send_status_msg(sock, ret_code); | |
f261ad0a | 813 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
a4baae1b JD |
814 | /* Somehow, the session daemon is not responding anymore. */ |
815 | goto end_nosignal; | |
816 | } | |
817 | ||
818 | health_code_update(); | |
819 | ||
820 | /* | |
821 | * We should not send this message if we don't monitor the | |
822 | * streams in this channel. | |
823 | */ | |
824 | if (!channel->monitor) { | |
825 | break; | |
826 | } | |
827 | ||
828 | health_code_update(); | |
829 | /* Send stream to relayd if the stream has an ID. */ | |
830 | if (msg.u.sent_streams.net_seq_idx != (uint64_t) -1ULL) { | |
831 | ret = consumer_send_relayd_streams_sent( | |
832 | msg.u.sent_streams.net_seq_idx); | |
833 | if (ret < 0) { | |
834 | goto end_nosignal; | |
835 | } | |
7881b1c4 | 836 | channel->streams_sent_to_relayd = true; |
a4baae1b JD |
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 | ||
bf181b05 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); | |
bf181b05 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 | ||
bf181b05 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); | |
bf181b05 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 | } | |
3bd1e081 | 1040 | default: |
3f8e211f | 1041 | goto end_nosignal; |
3bd1e081 | 1042 | } |
3f8e211f | 1043 | |
3bd1e081 | 1044 | end_nosignal: |
b0b335c8 | 1045 | rcu_read_unlock(); |
4cbc1a04 DG |
1046 | |
1047 | /* | |
1048 | * Return 1 to indicate success since the 0 value can be a socket | |
1049 | * shutdown during the recv() or send() call. | |
1050 | */ | |
9ce5646a | 1051 | health_code_update(); |
4cbc1a04 | 1052 | return 1; |
1803a064 MD |
1053 | |
1054 | error_fatal: | |
1055 | rcu_read_unlock(); | |
1056 | /* This will issue a consumer stop. */ | |
1057 | return -1; | |
3bd1e081 | 1058 | } |
d41f73b7 | 1059 | |
309167d2 JD |
1060 | /* |
1061 | * Populate index values of a kernel stream. Values are set in big endian order. | |
1062 | * | |
1063 | * Return 0 on success or else a negative value. | |
1064 | */ | |
50adc264 | 1065 | static int get_index_values(struct ctf_packet_index *index, int infd) |
309167d2 JD |
1066 | { |
1067 | int ret; | |
1068 | ||
1069 | ret = kernctl_get_timestamp_begin(infd, &index->timestamp_begin); | |
1070 | if (ret < 0) { | |
1071 | PERROR("kernctl_get_timestamp_begin"); | |
1072 | goto error; | |
1073 | } | |
1074 | index->timestamp_begin = htobe64(index->timestamp_begin); | |
1075 | ||
1076 | ret = kernctl_get_timestamp_end(infd, &index->timestamp_end); | |
1077 | if (ret < 0) { | |
1078 | PERROR("kernctl_get_timestamp_end"); | |
1079 | goto error; | |
1080 | } | |
1081 | index->timestamp_end = htobe64(index->timestamp_end); | |
1082 | ||
1083 | ret = kernctl_get_events_discarded(infd, &index->events_discarded); | |
1084 | if (ret < 0) { | |
1085 | PERROR("kernctl_get_events_discarded"); | |
1086 | goto error; | |
1087 | } | |
1088 | index->events_discarded = htobe64(index->events_discarded); | |
1089 | ||
1090 | ret = kernctl_get_content_size(infd, &index->content_size); | |
1091 | if (ret < 0) { | |
1092 | PERROR("kernctl_get_content_size"); | |
1093 | goto error; | |
1094 | } | |
1095 | index->content_size = htobe64(index->content_size); | |
1096 | ||
1097 | ret = kernctl_get_packet_size(infd, &index->packet_size); | |
1098 | if (ret < 0) { | |
1099 | PERROR("kernctl_get_packet_size"); | |
1100 | goto error; | |
1101 | } | |
1102 | index->packet_size = htobe64(index->packet_size); | |
1103 | ||
1104 | ret = kernctl_get_stream_id(infd, &index->stream_id); | |
1105 | if (ret < 0) { | |
1106 | PERROR("kernctl_get_stream_id"); | |
1107 | goto error; | |
1108 | } | |
1109 | index->stream_id = htobe64(index->stream_id); | |
1110 | ||
234cd636 JD |
1111 | ret = kernctl_get_instance_id(infd, &index->stream_instance_id); |
1112 | if (ret < 0) { | |
912a3957 MD |
1113 | if (ret == -ENOTTY) { |
1114 | /* Command not implemented by lttng-modules. */ | |
1115 | index->stream_instance_id = -1ULL; | |
1116 | ret = 0; | |
1117 | } else { | |
1118 | PERROR("kernctl_get_instance_id"); | |
1119 | goto error; | |
1120 | } | |
234cd636 JD |
1121 | } |
1122 | index->stream_instance_id = htobe64(index->stream_instance_id); | |
1123 | ||
1124 | ret = kernctl_get_sequence_number(infd, &index->packet_seq_num); | |
1125 | if (ret < 0) { | |
912a3957 MD |
1126 | if (ret == -ENOTTY) { |
1127 | /* Command not implemented by lttng-modules. */ | |
1128 | index->packet_seq_num = -1ULL; | |
1129 | ret = 0; | |
1130 | } else { | |
1131 | PERROR("kernctl_get_sequence_number"); | |
1132 | goto error; | |
1133 | } | |
234cd636 JD |
1134 | } |
1135 | index->packet_seq_num = htobe64(index->packet_seq_num); | |
1136 | ||
309167d2 JD |
1137 | error: |
1138 | return ret; | |
1139 | } | |
94d49140 JD |
1140 | /* |
1141 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
1142 | * metadata thread can consumer them. | |
1143 | * | |
1144 | * Metadata stream lock MUST be acquired. | |
1145 | * | |
1146 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream | |
1147 | * is empty or a negative value on error. | |
1148 | */ | |
1149 | int lttng_kconsumer_sync_metadata(struct lttng_consumer_stream *metadata) | |
1150 | { | |
1151 | int ret; | |
1152 | ||
1153 | assert(metadata); | |
1154 | ||
1155 | ret = kernctl_buffer_flush(metadata->wait_fd); | |
1156 | if (ret < 0) { | |
1157 | ERR("Failed to flush kernel stream"); | |
1158 | goto end; | |
1159 | } | |
1160 | ||
1161 | ret = kernctl_snapshot(metadata->wait_fd); | |
1162 | if (ret < 0) { | |
1163 | if (errno != EAGAIN) { | |
1164 | ERR("Sync metadata, taking kernel snapshot failed."); | |
1165 | goto end; | |
1166 | } | |
1167 | DBG("Sync metadata, no new kernel metadata"); | |
1168 | /* No new metadata, exit. */ | |
1169 | ret = ENODATA; | |
1170 | goto end; | |
1171 | } | |
1172 | ||
1173 | end: | |
1174 | return ret; | |
1175 | } | |
309167d2 | 1176 | |
fb83fe64 JD |
1177 | static |
1178 | int update_stream_stats(struct lttng_consumer_stream *stream) | |
1179 | { | |
1180 | int ret; | |
1181 | uint64_t seq, discarded; | |
1182 | ||
1183 | ret = kernctl_get_sequence_number(stream->wait_fd, &seq); | |
1184 | if (ret < 0) { | |
912a3957 MD |
1185 | if (ret == -ENOTTY) { |
1186 | /* Command not implemented by lttng-modules. */ | |
1187 | seq = -1ULL; | |
1188 | ret = 0; | |
1189 | } else { | |
1190 | PERROR("kernctl_get_sequence_number"); | |
1191 | goto end; | |
1192 | } | |
fb83fe64 JD |
1193 | } |
1194 | ||
1195 | /* | |
1196 | * Start the sequence when we extract the first packet in case we don't | |
1197 | * start at 0 (for example if a consumer is not connected to the | |
1198 | * session immediately after the beginning). | |
1199 | */ | |
1200 | if (stream->last_sequence_number == -1ULL) { | |
1201 | stream->last_sequence_number = seq; | |
1202 | } else if (seq > stream->last_sequence_number) { | |
1203 | stream->chan->lost_packets += seq - | |
1204 | stream->last_sequence_number - 1; | |
1205 | } else { | |
1206 | /* seq <= last_sequence_number */ | |
1207 | ERR("Sequence number inconsistent : prev = %" PRIu64 | |
1208 | ", current = %" PRIu64, | |
1209 | stream->last_sequence_number, seq); | |
1210 | ret = -1; | |
1211 | goto end; | |
1212 | } | |
1213 | stream->last_sequence_number = seq; | |
1214 | ||
1215 | ret = kernctl_get_events_discarded(stream->wait_fd, &discarded); | |
1216 | if (ret < 0) { | |
1217 | PERROR("kernctl_get_events_discarded"); | |
1218 | goto end; | |
1219 | } | |
1220 | if (discarded < stream->last_discarded_events) { | |
1221 | /* | |
fae1e3cc MJ |
1222 | * Overflow has occurred. We assume only one wrap-around |
1223 | * has occurred. | |
fb83fe64 JD |
1224 | */ |
1225 | stream->chan->discarded_events += (1ULL << (CAA_BITS_PER_LONG - 1)) - | |
1226 | stream->last_discarded_events + discarded; | |
1227 | } else { | |
1228 | stream->chan->discarded_events += discarded - | |
1229 | stream->last_discarded_events; | |
1230 | } | |
1231 | stream->last_discarded_events = discarded; | |
1232 | ret = 0; | |
1233 | ||
1234 | end: | |
1235 | return ret; | |
1236 | } | |
1237 | ||
93ec662e JD |
1238 | /* |
1239 | * Check if the local version of the metadata stream matches with the version | |
1240 | * of the metadata stream in the kernel. If it was updated, set the reset flag | |
1241 | * on the stream. | |
1242 | */ | |
1243 | static | |
1244 | int metadata_stream_check_version(int infd, struct lttng_consumer_stream *stream) | |
1245 | { | |
1246 | int ret; | |
1247 | uint64_t cur_version; | |
1248 | ||
1249 | ret = kernctl_get_metadata_version(infd, &cur_version); | |
1250 | if (ret < 0) { | |
912a3957 MD |
1251 | if (ret == -ENOTTY) { |
1252 | /* | |
1253 | * LTTng-modules does not implement this | |
1254 | * command. | |
1255 | */ | |
1256 | ret = 0; | |
1257 | goto end; | |
1258 | } | |
93ec662e JD |
1259 | ERR("Failed to get the metadata version"); |
1260 | goto end; | |
1261 | } | |
1262 | ||
1263 | if (stream->metadata_version == cur_version) { | |
1264 | ret = 0; | |
1265 | goto end; | |
1266 | } | |
1267 | ||
1268 | DBG("New metadata version detected"); | |
1269 | stream->metadata_version = cur_version; | |
1270 | stream->reset_metadata_flag = 1; | |
1271 | ret = 0; | |
1272 | ||
1273 | end: | |
1274 | return ret; | |
1275 | } | |
1276 | ||
d41f73b7 MD |
1277 | /* |
1278 | * Consume data on a file descriptor and write it on a trace file. | |
1279 | */ | |
4078b776 | 1280 | ssize_t lttng_kconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
1281 | struct lttng_consumer_local_data *ctx) |
1282 | { | |
1d4dfdef | 1283 | unsigned long len, subbuf_size, padding; |
1c20f0e2 | 1284 | int err, write_index = 1; |
4078b776 | 1285 | ssize_t ret = 0; |
d41f73b7 | 1286 | int infd = stream->wait_fd; |
50adc264 | 1287 | struct ctf_packet_index index; |
d41f73b7 MD |
1288 | |
1289 | DBG("In read_subbuffer (infd : %d)", infd); | |
309167d2 | 1290 | |
d41f73b7 MD |
1291 | /* Get the next subbuffer */ |
1292 | err = kernctl_get_next_subbuf(infd); | |
1293 | if (err != 0) { | |
d41f73b7 MD |
1294 | /* |
1295 | * This is a debug message even for single-threaded consumer, | |
1296 | * because poll() have more relaxed criterions than get subbuf, | |
1297 | * so get_subbuf may fail for short race windows where poll() | |
1298 | * would issue wakeups. | |
1299 | */ | |
1300 | DBG("Reserving sub buffer failed (everything is normal, " | |
1301 | "it is due to concurrency)"); | |
56591bac | 1302 | ret = -errno; |
d41f73b7 MD |
1303 | goto end; |
1304 | } | |
1305 | ||
1d4dfdef DG |
1306 | /* Get the full subbuffer size including padding */ |
1307 | err = kernctl_get_padded_subbuf_size(infd, &len); | |
1308 | if (err != 0) { | |
5a510c9f | 1309 | PERROR("Getting sub-buffer len failed."); |
8265f19e MD |
1310 | err = kernctl_put_subbuf(infd); |
1311 | if (err != 0) { | |
1312 | if (errno == EFAULT) { | |
5a510c9f | 1313 | PERROR("Error in unreserving sub buffer\n"); |
8265f19e MD |
1314 | } else if (errno == EIO) { |
1315 | /* Should never happen with newer LTTng versions */ | |
5a510c9f | 1316 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e MD |
1317 | } |
1318 | ret = -errno; | |
1319 | goto end; | |
1320 | } | |
56591bac | 1321 | ret = -errno; |
1d4dfdef DG |
1322 | goto end; |
1323 | } | |
1324 | ||
1c20f0e2 | 1325 | if (!stream->metadata_flag) { |
309167d2 JD |
1326 | ret = get_index_values(&index, infd); |
1327 | if (ret < 0) { | |
8265f19e MD |
1328 | err = kernctl_put_subbuf(infd); |
1329 | if (err != 0) { | |
1330 | if (errno == EFAULT) { | |
5a510c9f | 1331 | PERROR("Error in unreserving sub buffer\n"); |
8265f19e MD |
1332 | } else if (errno == EIO) { |
1333 | /* Should never happen with newer LTTng versions */ | |
5a510c9f | 1334 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e MD |
1335 | } |
1336 | ret = -errno; | |
1337 | goto end; | |
1338 | } | |
309167d2 JD |
1339 | goto end; |
1340 | } | |
fb83fe64 JD |
1341 | ret = update_stream_stats(stream); |
1342 | if (ret < 0) { | |
c3c60f7d MD |
1343 | err = kernctl_put_subbuf(infd); |
1344 | if (err != 0) { | |
1345 | if (err == -EFAULT) { | |
1346 | PERROR("Error in unreserving sub buffer\n"); | |
1347 | } else if (err == -EIO) { | |
1348 | /* Should never happen with newer LTTng versions */ | |
1349 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
1350 | } | |
1351 | ret = err; | |
1352 | goto end; | |
1353 | } | |
fb83fe64 JD |
1354 | goto end; |
1355 | } | |
1c20f0e2 JD |
1356 | } else { |
1357 | write_index = 0; | |
93ec662e JD |
1358 | ret = metadata_stream_check_version(infd, stream); |
1359 | if (ret < 0) { | |
c3c60f7d MD |
1360 | err = kernctl_put_subbuf(infd); |
1361 | if (err != 0) { | |
1362 | if (err == -EFAULT) { | |
1363 | PERROR("Error in unreserving sub buffer\n"); | |
1364 | } else if (err == -EIO) { | |
1365 | /* Should never happen with newer LTTng versions */ | |
1366 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
1367 | } | |
1368 | ret = err; | |
1369 | goto end; | |
1370 | } | |
93ec662e JD |
1371 | goto end; |
1372 | } | |
309167d2 JD |
1373 | } |
1374 | ||
ffe60014 | 1375 | switch (stream->chan->output) { |
07b86b52 | 1376 | case CONSUMER_CHANNEL_SPLICE: |
1d4dfdef DG |
1377 | /* |
1378 | * XXX: The lttng-modules splice "actor" does not handle copying | |
1379 | * partial pages hence only using the subbuffer size without the | |
1380 | * padding makes the splice fail. | |
1381 | */ | |
1382 | subbuf_size = len; | |
1383 | padding = 0; | |
1384 | ||
1385 | /* splice the subbuffer to the tracefile */ | |
91dfef6e | 1386 | ret = lttng_consumer_on_read_subbuffer_splice(ctx, stream, subbuf_size, |
309167d2 | 1387 | padding, &index); |
91dfef6e DG |
1388 | /* |
1389 | * XXX: Splice does not support network streaming so the return value | |
1390 | * is simply checked against subbuf_size and not like the mmap() op. | |
1391 | */ | |
1d4dfdef DG |
1392 | if (ret != subbuf_size) { |
1393 | /* | |
1394 | * display the error but continue processing to try | |
1395 | * to release the subbuffer | |
1396 | */ | |
1397 | ERR("Error splicing to tracefile (ret: %zd != len: %lu)", | |
1398 | ret, subbuf_size); | |
309167d2 | 1399 | write_index = 0; |
1d4dfdef DG |
1400 | } |
1401 | break; | |
07b86b52 | 1402 | case CONSUMER_CHANNEL_MMAP: |
1d4dfdef DG |
1403 | /* Get subbuffer size without padding */ |
1404 | err = kernctl_get_subbuf_size(infd, &subbuf_size); | |
1405 | if (err != 0) { | |
5a510c9f | 1406 | PERROR("Getting sub-buffer len failed."); |
8265f19e MD |
1407 | err = kernctl_put_subbuf(infd); |
1408 | if (err != 0) { | |
1409 | if (errno == EFAULT) { | |
5a510c9f | 1410 | PERROR("Error in unreserving sub buffer\n"); |
8265f19e MD |
1411 | } else if (errno == EIO) { |
1412 | /* Should never happen with newer LTTng versions */ | |
5a510c9f | 1413 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e MD |
1414 | } |
1415 | ret = -errno; | |
1416 | goto end; | |
1417 | } | |
56591bac | 1418 | ret = -errno; |
1d4dfdef DG |
1419 | goto end; |
1420 | } | |
47e81c02 | 1421 | |
1d4dfdef DG |
1422 | /* Make sure the tracer is not gone mad on us! */ |
1423 | assert(len >= subbuf_size); | |
1424 | ||
1425 | padding = len - subbuf_size; | |
1426 | ||
1427 | /* write the subbuffer to the tracefile */ | |
91dfef6e | 1428 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, |
309167d2 | 1429 | padding, &index); |
91dfef6e DG |
1430 | /* |
1431 | * The mmap operation should write subbuf_size amount of data when | |
1432 | * network streaming or the full padding (len) size when we are _not_ | |
1433 | * streaming. | |
1434 | */ | |
d88aee68 DG |
1435 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
1436 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
1d4dfdef | 1437 | /* |
91dfef6e | 1438 | * Display the error but continue processing to try to release the |
2336629e DG |
1439 | * subbuffer. This is a DBG statement since this is possible to |
1440 | * happen without being a critical error. | |
1d4dfdef | 1441 | */ |
2336629e | 1442 | DBG("Error writing to tracefile " |
91dfef6e DG |
1443 | "(ret: %zd != len: %lu != subbuf_size: %lu)", |
1444 | ret, len, subbuf_size); | |
309167d2 | 1445 | write_index = 0; |
1d4dfdef DG |
1446 | } |
1447 | break; | |
1448 | default: | |
1449 | ERR("Unknown output method"); | |
56591bac | 1450 | ret = -EPERM; |
d41f73b7 MD |
1451 | } |
1452 | ||
1453 | err = kernctl_put_next_subbuf(infd); | |
1454 | if (err != 0) { | |
d41f73b7 | 1455 | if (errno == EFAULT) { |
5a510c9f | 1456 | PERROR("Error in unreserving sub buffer\n"); |
d41f73b7 MD |
1457 | } else if (errno == EIO) { |
1458 | /* Should never happen with newer LTTng versions */ | |
5a510c9f | 1459 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
d41f73b7 | 1460 | } |
56591bac | 1461 | ret = -errno; |
d41f73b7 MD |
1462 | goto end; |
1463 | } | |
1464 | ||
309167d2 | 1465 | /* Write index if needed. */ |
1c20f0e2 JD |
1466 | if (!write_index) { |
1467 | goto end; | |
1468 | } | |
1469 | ||
94d49140 JD |
1470 | if (stream->chan->live_timer_interval && !stream->metadata_flag) { |
1471 | /* | |
1472 | * In live, block until all the metadata is sent. | |
1473 | */ | |
c585821b MD |
1474 | pthread_mutex_lock(&stream->metadata_timer_lock); |
1475 | assert(!stream->missed_metadata_flush); | |
1476 | stream->waiting_on_metadata = true; | |
1477 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1478 | ||
94d49140 | 1479 | err = consumer_stream_sync_metadata(ctx, stream->session_id); |
c585821b MD |
1480 | |
1481 | pthread_mutex_lock(&stream->metadata_timer_lock); | |
1482 | stream->waiting_on_metadata = false; | |
1483 | if (stream->missed_metadata_flush) { | |
1484 | stream->missed_metadata_flush = false; | |
1485 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1486 | (void) consumer_flush_kernel_index(stream); | |
1487 | } else { | |
1488 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1489 | } | |
94d49140 JD |
1490 | if (err < 0) { |
1491 | goto end; | |
1492 | } | |
1493 | } | |
1494 | ||
1c20f0e2 JD |
1495 | err = consumer_stream_write_index(stream, &index); |
1496 | if (err < 0) { | |
1497 | goto end; | |
309167d2 JD |
1498 | } |
1499 | ||
d41f73b7 MD |
1500 | end: |
1501 | return ret; | |
1502 | } | |
1503 | ||
1504 | int lttng_kconsumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
1505 | { | |
1506 | int ret; | |
ffe60014 DG |
1507 | |
1508 | assert(stream); | |
1509 | ||
2bba9e53 DG |
1510 | /* |
1511 | * Don't create anything if this is set for streaming or should not be | |
1512 | * monitored. | |
1513 | */ | |
1514 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { | |
fe4477ee JD |
1515 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
1516 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
309167d2 | 1517 | stream->uid, stream->gid, NULL); |
fe4477ee JD |
1518 | if (ret < 0) { |
1519 | goto error; | |
1520 | } | |
1521 | stream->out_fd = ret; | |
1522 | stream->tracefile_size_current = 0; | |
309167d2 JD |
1523 | |
1524 | if (!stream->metadata_flag) { | |
8dbd7d83 MD |
1525 | struct lttng_index_file *index_file; |
1526 | ||
1527 | index_file = lttng_index_file_create(stream->chan->pathname, | |
309167d2 JD |
1528 | stream->name, stream->uid, stream->gid, |
1529 | stream->chan->tracefile_size, | |
8dbd7d83 MD |
1530 | stream->tracefile_count_current, |
1531 | CTF_INDEX_MAJOR, CTF_INDEX_MINOR); | |
1532 | if (!index_file) { | |
309167d2 JD |
1533 | goto error; |
1534 | } | |
8dbd7d83 | 1535 | stream->index_file = index_file; |
309167d2 | 1536 | } |
ffe60014 | 1537 | } |
d41f73b7 | 1538 | |
d41f73b7 MD |
1539 | if (stream->output == LTTNG_EVENT_MMAP) { |
1540 | /* get the len of the mmap region */ | |
1541 | unsigned long mmap_len; | |
1542 | ||
1543 | ret = kernctl_get_mmap_len(stream->wait_fd, &mmap_len); | |
1544 | if (ret != 0) { | |
ffe60014 | 1545 | PERROR("kernctl_get_mmap_len"); |
56591bac | 1546 | ret = -errno; |
d41f73b7 MD |
1547 | goto error_close_fd; |
1548 | } | |
1549 | stream->mmap_len = (size_t) mmap_len; | |
1550 | ||
ffe60014 DG |
1551 | stream->mmap_base = mmap(NULL, stream->mmap_len, PROT_READ, |
1552 | MAP_PRIVATE, stream->wait_fd, 0); | |
d41f73b7 | 1553 | if (stream->mmap_base == MAP_FAILED) { |
ffe60014 | 1554 | PERROR("Error mmaping"); |
d41f73b7 MD |
1555 | ret = -1; |
1556 | goto error_close_fd; | |
1557 | } | |
1558 | } | |
1559 | ||
1560 | /* we return 0 to let the library handle the FD internally */ | |
1561 | return 0; | |
1562 | ||
1563 | error_close_fd: | |
2f225ce2 | 1564 | if (stream->out_fd >= 0) { |
d41f73b7 MD |
1565 | int err; |
1566 | ||
1567 | err = close(stream->out_fd); | |
1568 | assert(!err); | |
2f225ce2 | 1569 | stream->out_fd = -1; |
d41f73b7 MD |
1570 | } |
1571 | error: | |
1572 | return ret; | |
1573 | } | |
1574 | ||
ca22feea DG |
1575 | /* |
1576 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
1577 | * stream. Consumer data lock MUST be acquired before calling this function |
1578 | * and the stream lock. | |
ca22feea | 1579 | * |
6d805429 | 1580 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
1581 | * data is available for trace viewer reading. |
1582 | */ | |
6d805429 | 1583 | int lttng_kconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
1584 | { |
1585 | int ret; | |
1586 | ||
1587 | assert(stream); | |
1588 | ||
873b9e9a MD |
1589 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
1590 | ret = 0; | |
1591 | goto end; | |
1592 | } | |
1593 | ||
ca22feea DG |
1594 | ret = kernctl_get_next_subbuf(stream->wait_fd); |
1595 | if (ret == 0) { | |
1596 | /* There is still data so let's put back this subbuffer. */ | |
1597 | ret = kernctl_put_subbuf(stream->wait_fd); | |
1598 | assert(ret == 0); | |
6d805429 | 1599 | ret = 1; /* Data is pending */ |
4e9a4686 | 1600 | goto end; |
ca22feea DG |
1601 | } |
1602 | ||
6d805429 DG |
1603 | /* Data is NOT pending and ready to be read. */ |
1604 | ret = 0; | |
ca22feea | 1605 | |
6efae65e DG |
1606 | end: |
1607 | return ret; | |
ca22feea | 1608 | } |