Commit | Line | Data |
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3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * | |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
3bd1e081 MD |
8 | * |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
3bd1e081 MD |
17 | */ |
18 | ||
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 | 190 | |
e49273dc | 191 | ret = kernctl_buffer_flush_empty(stream->wait_fd); |
07b86b52 | 192 | if (ret < 0) { |
e49273dc MD |
193 | /* |
194 | * Doing a buffer flush which does not take into | |
195 | * account empty packets. This is not perfect | |
196 | * for stream intersection, but required as a | |
197 | * fall-back when "flush_empty" is not | |
198 | * implemented by lttng-modules. | |
199 | */ | |
200 | ret = kernctl_buffer_flush(stream->wait_fd); | |
201 | if (ret < 0) { | |
202 | ERR("Failed to flush kernel stream"); | |
203 | goto end_unlock; | |
204 | } | |
07b86b52 JD |
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"); | |
56591bac | 230 | ret = -errno; |
07b86b52 JD |
231 | goto end_unlock; |
232 | } | |
233 | } | |
234 | ||
d07ceecd MD |
235 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
236 | produced_pos, nb_packets_per_stream, | |
237 | stream->max_sb_size); | |
5c786ded | 238 | |
07b86b52 JD |
239 | while (consumed_pos < produced_pos) { |
240 | ssize_t read_len; | |
241 | unsigned long len, padded_len; | |
c13082a9 | 242 | int lost_packet = 0; |
07b86b52 | 243 | |
9ce5646a MD |
244 | health_code_update(); |
245 | ||
07b86b52 JD |
246 | DBG("Kernel consumer taking snapshot at pos %lu", consumed_pos); |
247 | ||
248 | ret = kernctl_get_subbuf(stream->wait_fd, &consumed_pos); | |
249 | if (ret < 0) { | |
250 | if (errno != EAGAIN) { | |
251 | PERROR("kernctl_get_subbuf snapshot"); | |
56591bac | 252 | ret = -errno; |
07b86b52 JD |
253 | goto end_unlock; |
254 | } | |
255 | DBG("Kernel consumer get subbuf failed. Skipping it."); | |
256 | consumed_pos += stream->max_sb_size; | |
c13082a9 JD |
257 | |
258 | /* | |
259 | * Start accounting lost packets only when we | |
260 | * already have extracted packets (to match the | |
261 | * content of the final snapshot). | |
262 | */ | |
263 | if (!before_first_packet) { | |
264 | lost_packet = 1; | |
265 | } | |
07b86b52 JD |
266 | continue; |
267 | } | |
268 | ||
269 | ret = kernctl_get_subbuf_size(stream->wait_fd, &len); | |
270 | if (ret < 0) { | |
271 | ERR("Snapshot kernctl_get_subbuf_size"); | |
56591bac | 272 | ret = -errno; |
29decac3 | 273 | goto error_put_subbuf; |
07b86b52 JD |
274 | } |
275 | ||
276 | ret = kernctl_get_padded_subbuf_size(stream->wait_fd, &padded_len); | |
277 | if (ret < 0) { | |
278 | ERR("Snapshot kernctl_get_padded_subbuf_size"); | |
56591bac | 279 | ret = -errno; |
29decac3 | 280 | goto error_put_subbuf; |
07b86b52 JD |
281 | } |
282 | ||
283 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
309167d2 | 284 | padded_len - len, NULL); |
07b86b52 | 285 | /* |
29decac3 DG |
286 | * We write the padded len in local tracefiles but the data len |
287 | * when using a relay. Display the error but continue processing | |
288 | * to try to release the subbuffer. | |
07b86b52 JD |
289 | */ |
290 | if (relayd_id != (uint64_t) -1ULL) { | |
291 | if (read_len != len) { | |
292 | ERR("Error sending to the relay (ret: %zd != len: %lu)", | |
293 | read_len, len); | |
294 | } | |
295 | } else { | |
296 | if (read_len != padded_len) { | |
297 | ERR("Error writing to tracefile (ret: %zd != len: %lu)", | |
298 | read_len, padded_len); | |
299 | } | |
300 | } | |
301 | ||
302 | ret = kernctl_put_subbuf(stream->wait_fd); | |
303 | if (ret < 0) { | |
304 | ERR("Snapshot kernctl_put_subbuf"); | |
56591bac | 305 | ret = -errno; |
07b86b52 JD |
306 | goto end_unlock; |
307 | } | |
308 | consumed_pos += stream->max_sb_size; | |
c13082a9 JD |
309 | |
310 | /* | |
311 | * Only account lost packets located between | |
312 | * succesfully extracted packets (do not account before | |
313 | * and after since they are not visible in the | |
314 | * resulting snapshot). | |
315 | */ | |
316 | stream->chan->lost_packets += lost_packet; | |
317 | lost_packet = 0; | |
318 | before_first_packet = false; | |
07b86b52 JD |
319 | } |
320 | ||
321 | if (relayd_id == (uint64_t) -1ULL) { | |
fdf9986c MD |
322 | if (stream->out_fd >= 0) { |
323 | ret = close(stream->out_fd); | |
324 | if (ret < 0) { | |
325 | PERROR("Kernel consumer snapshot close out_fd"); | |
326 | goto end_unlock; | |
327 | } | |
328 | stream->out_fd = -1; | |
07b86b52 | 329 | } |
07b86b52 JD |
330 | } else { |
331 | close_relayd_stream(stream); | |
332 | stream->net_seq_idx = (uint64_t) -1ULL; | |
333 | } | |
334 | pthread_mutex_unlock(&stream->lock); | |
335 | } | |
336 | ||
337 | /* All good! */ | |
338 | ret = 0; | |
339 | goto end; | |
340 | ||
29decac3 DG |
341 | error_put_subbuf: |
342 | ret = kernctl_put_subbuf(stream->wait_fd); | |
343 | if (ret < 0) { | |
56591bac | 344 | ret = -errno; |
29decac3 DG |
345 | ERR("Snapshot kernctl_put_subbuf error path"); |
346 | } | |
07b86b52 JD |
347 | end_unlock: |
348 | pthread_mutex_unlock(&stream->lock); | |
349 | end: | |
350 | rcu_read_unlock(); | |
351 | return ret; | |
352 | } | |
353 | ||
354 | /* | |
355 | * Read the whole metadata available for a snapshot. | |
356 | * | |
357 | * Returns 0 on success, < 0 on error | |
358 | */ | |
359 | int lttng_kconsumer_snapshot_metadata(uint64_t key, char *path, | |
e2039c7a | 360 | uint64_t relayd_id, struct lttng_consumer_local_data *ctx) |
07b86b52 | 361 | { |
d771f832 DG |
362 | int ret, use_relayd = 0; |
363 | ssize_t ret_read; | |
07b86b52 JD |
364 | struct lttng_consumer_channel *metadata_channel; |
365 | struct lttng_consumer_stream *metadata_stream; | |
d771f832 DG |
366 | |
367 | assert(ctx); | |
07b86b52 JD |
368 | |
369 | DBG("Kernel consumer snapshot metadata with key %" PRIu64 " at path %s", | |
370 | key, path); | |
371 | ||
372 | rcu_read_lock(); | |
373 | ||
374 | metadata_channel = consumer_find_channel(key); | |
375 | if (!metadata_channel) { | |
d771f832 | 376 | ERR("Kernel snapshot metadata not found for key %" PRIu64, key); |
07b86b52 | 377 | ret = -1; |
d771f832 | 378 | goto error; |
07b86b52 JD |
379 | } |
380 | ||
381 | metadata_stream = metadata_channel->metadata_stream; | |
382 | assert(metadata_stream); | |
383 | ||
d771f832 | 384 | /* Flag once that we have a valid relayd for the stream. */ |
e2039c7a | 385 | if (relayd_id != (uint64_t) -1ULL) { |
d771f832 DG |
386 | use_relayd = 1; |
387 | } | |
388 | ||
389 | if (use_relayd) { | |
10a50311 | 390 | ret = consumer_send_relayd_stream(metadata_stream, path); |
e2039c7a | 391 | if (ret < 0) { |
d771f832 | 392 | goto error; |
e2039c7a | 393 | } |
e2039c7a JD |
394 | } else { |
395 | ret = utils_create_stream_file(path, metadata_stream->name, | |
396 | metadata_stream->chan->tracefile_size, | |
397 | metadata_stream->tracefile_count_current, | |
309167d2 | 398 | metadata_stream->uid, metadata_stream->gid, NULL); |
e2039c7a | 399 | if (ret < 0) { |
d771f832 | 400 | goto error; |
e2039c7a JD |
401 | } |
402 | metadata_stream->out_fd = ret; | |
07b86b52 | 403 | } |
07b86b52 | 404 | |
d771f832 | 405 | do { |
9ce5646a MD |
406 | health_code_update(); |
407 | ||
d771f832 DG |
408 | ret_read = lttng_kconsumer_read_subbuffer(metadata_stream, ctx); |
409 | if (ret_read < 0) { | |
56591bac | 410 | if (ret_read != -EAGAIN) { |
6a00837f | 411 | ERR("Kernel snapshot reading metadata subbuffer (ret: %zd)", |
d771f832 DG |
412 | ret_read); |
413 | goto error; | |
07b86b52 | 414 | } |
d771f832 | 415 | /* ret_read is negative at this point so we will exit the loop. */ |
07b86b52 JD |
416 | continue; |
417 | } | |
d771f832 | 418 | } while (ret_read >= 0); |
07b86b52 | 419 | |
d771f832 DG |
420 | if (use_relayd) { |
421 | close_relayd_stream(metadata_stream); | |
422 | metadata_stream->net_seq_idx = (uint64_t) -1ULL; | |
423 | } else { | |
fdf9986c MD |
424 | if (metadata_stream->out_fd >= 0) { |
425 | ret = close(metadata_stream->out_fd); | |
426 | if (ret < 0) { | |
427 | PERROR("Kernel consumer snapshot metadata close out_fd"); | |
428 | /* | |
429 | * Don't go on error here since the snapshot was successful at this | |
430 | * point but somehow the close failed. | |
431 | */ | |
432 | } | |
433 | metadata_stream->out_fd = -1; | |
e2039c7a | 434 | } |
e2039c7a JD |
435 | } |
436 | ||
07b86b52 | 437 | ret = 0; |
d771f832 | 438 | |
cf53a8a6 JD |
439 | cds_list_del(&metadata_stream->send_node); |
440 | consumer_stream_destroy(metadata_stream, NULL); | |
441 | metadata_channel->metadata_stream = NULL; | |
d771f832 | 442 | error: |
07b86b52 JD |
443 | rcu_read_unlock(); |
444 | return ret; | |
445 | } | |
446 | ||
1803a064 MD |
447 | /* |
448 | * Receive command from session daemon and process it. | |
449 | * | |
450 | * Return 1 on success else a negative value or 0. | |
451 | */ | |
3bd1e081 MD |
452 | int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
453 | int sock, struct pollfd *consumer_sockpoll) | |
454 | { | |
455 | ssize_t ret; | |
0c759fc9 | 456 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 MD |
457 | struct lttcomm_consumer_msg msg; |
458 | ||
9ce5646a MD |
459 | health_code_update(); |
460 | ||
3bd1e081 MD |
461 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
462 | if (ret != sizeof(msg)) { | |
1803a064 | 463 | if (ret > 0) { |
c6857fcf | 464 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
1803a064 MD |
465 | ret = -1; |
466 | } | |
3bd1e081 MD |
467 | return ret; |
468 | } | |
9ce5646a MD |
469 | |
470 | health_code_update(); | |
471 | ||
84382d49 MD |
472 | /* Deprecated command */ |
473 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 474 | |
9ce5646a MD |
475 | health_code_update(); |
476 | ||
b0b335c8 MD |
477 | /* relayd needs RCU read-side protection */ |
478 | rcu_read_lock(); | |
479 | ||
3bd1e081 | 480 | switch (msg.cmd_type) { |
00e2e675 DG |
481 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
482 | { | |
f50f23d9 | 483 | /* Session daemon status message are handled in the following call. */ |
7735ef9e DG |
484 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
485 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, | |
d3e2ba59 JD |
486 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
487 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
488 | goto end_nosignal; |
489 | } | |
3bd1e081 MD |
490 | case LTTNG_CONSUMER_ADD_CHANNEL: |
491 | { | |
492 | struct lttng_consumer_channel *new_channel; | |
e43c41c5 | 493 | int ret_recv; |
3bd1e081 | 494 | |
9ce5646a MD |
495 | health_code_update(); |
496 | ||
f50f23d9 DG |
497 | /* First send a status message before receiving the fds. */ |
498 | ret = consumer_send_status_msg(sock, ret_code); | |
499 | if (ret < 0) { | |
500 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 501 | goto error_fatal; |
f50f23d9 | 502 | } |
9ce5646a MD |
503 | |
504 | health_code_update(); | |
505 | ||
d88aee68 | 506 | DBG("consumer_add_channel %" PRIu64, msg.u.channel.channel_key); |
3bd1e081 | 507 | new_channel = consumer_allocate_channel(msg.u.channel.channel_key, |
ffe60014 DG |
508 | msg.u.channel.session_id, msg.u.channel.pathname, |
509 | msg.u.channel.name, msg.u.channel.uid, msg.u.channel.gid, | |
1624d5b7 JD |
510 | msg.u.channel.relayd_id, msg.u.channel.output, |
511 | msg.u.channel.tracefile_size, | |
1950109e | 512 | msg.u.channel.tracefile_count, 0, |
ecc48a90 | 513 | msg.u.channel.monitor, |
d7ba1388 | 514 | msg.u.channel.live_timer_interval, |
3d071855 | 515 | NULL, NULL); |
3bd1e081 | 516 | if (new_channel == NULL) { |
f73fabfd | 517 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
3bd1e081 MD |
518 | goto end_nosignal; |
519 | } | |
ffe60014 | 520 | new_channel->nb_init_stream_left = msg.u.channel.nb_init_streams; |
95a1109b JD |
521 | switch (msg.u.channel.output) { |
522 | case LTTNG_EVENT_SPLICE: | |
523 | new_channel->output = CONSUMER_CHANNEL_SPLICE; | |
524 | break; | |
525 | case LTTNG_EVENT_MMAP: | |
526 | new_channel->output = CONSUMER_CHANNEL_MMAP; | |
527 | break; | |
528 | default: | |
529 | ERR("Channel output unknown %d", msg.u.channel.output); | |
530 | goto end_nosignal; | |
531 | } | |
ffe60014 DG |
532 | |
533 | /* Translate and save channel type. */ | |
534 | switch (msg.u.channel.type) { | |
535 | case CONSUMER_CHANNEL_TYPE_DATA: | |
536 | case CONSUMER_CHANNEL_TYPE_METADATA: | |
537 | new_channel->type = msg.u.channel.type; | |
538 | break; | |
539 | default: | |
540 | assert(0); | |
541 | goto end_nosignal; | |
542 | }; | |
543 | ||
9ce5646a MD |
544 | health_code_update(); |
545 | ||
3bd1e081 | 546 | if (ctx->on_recv_channel != NULL) { |
e43c41c5 JD |
547 | ret_recv = ctx->on_recv_channel(new_channel); |
548 | if (ret_recv == 0) { | |
549 | ret = consumer_add_channel(new_channel, ctx); | |
550 | } else if (ret_recv < 0) { | |
3bd1e081 MD |
551 | goto end_nosignal; |
552 | } | |
553 | } else { | |
e43c41c5 | 554 | ret = consumer_add_channel(new_channel, ctx); |
3bd1e081 | 555 | } |
94d49140 JD |
556 | if (CONSUMER_CHANNEL_TYPE_DATA) { |
557 | consumer_timer_live_start(new_channel, | |
558 | msg.u.channel.live_timer_interval); | |
559 | } | |
e43c41c5 | 560 | |
9ce5646a MD |
561 | health_code_update(); |
562 | ||
e43c41c5 | 563 | /* If we received an error in add_channel, we need to report it. */ |
821fffb2 | 564 | if (ret < 0) { |
1803a064 MD |
565 | ret = consumer_send_status_msg(sock, ret); |
566 | if (ret < 0) { | |
567 | goto error_fatal; | |
568 | } | |
e43c41c5 JD |
569 | goto end_nosignal; |
570 | } | |
571 | ||
3bd1e081 MD |
572 | goto end_nosignal; |
573 | } | |
574 | case LTTNG_CONSUMER_ADD_STREAM: | |
575 | { | |
dae10966 DG |
576 | int fd; |
577 | struct lttng_pipe *stream_pipe; | |
00e2e675 | 578 | struct lttng_consumer_stream *new_stream; |
ffe60014 | 579 | struct lttng_consumer_channel *channel; |
c80048c6 | 580 | int alloc_ret = 0; |
3bd1e081 | 581 | |
ffe60014 DG |
582 | /* |
583 | * Get stream's channel reference. Needed when adding the stream to the | |
584 | * global hash table. | |
585 | */ | |
586 | channel = consumer_find_channel(msg.u.stream.channel_key); | |
587 | if (!channel) { | |
588 | /* | |
589 | * We could not find the channel. Can happen if cpu hotplug | |
590 | * happens while tearing down. | |
591 | */ | |
d88aee68 | 592 | ERR("Unable to find channel key %" PRIu64, msg.u.stream.channel_key); |
e462382a | 593 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
ffe60014 DG |
594 | } |
595 | ||
9ce5646a MD |
596 | health_code_update(); |
597 | ||
f50f23d9 DG |
598 | /* First send a status message before receiving the fds. */ |
599 | ret = consumer_send_status_msg(sock, ret_code); | |
1803a064 | 600 | if (ret < 0) { |
d771f832 | 601 | /* Somehow, the session daemon is not responding anymore. */ |
1803a064 MD |
602 | goto error_fatal; |
603 | } | |
9ce5646a MD |
604 | |
605 | health_code_update(); | |
606 | ||
0c759fc9 | 607 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
d771f832 | 608 | /* Channel was not found. */ |
f50f23d9 DG |
609 | goto end_nosignal; |
610 | } | |
611 | ||
d771f832 | 612 | /* Blocking call */ |
9ce5646a MD |
613 | health_poll_entry(); |
614 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
615 | health_poll_exit(); | |
84382d49 MD |
616 | if (ret) { |
617 | goto error_fatal; | |
3bd1e081 | 618 | } |
00e2e675 | 619 | |
9ce5646a MD |
620 | health_code_update(); |
621 | ||
00e2e675 | 622 | /* Get stream file descriptor from socket */ |
f2fc6720 MD |
623 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); |
624 | if (ret != sizeof(fd)) { | |
f73fabfd | 625 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
3f8e211f | 626 | rcu_read_unlock(); |
3bd1e081 MD |
627 | return ret; |
628 | } | |
3bd1e081 | 629 | |
9ce5646a MD |
630 | health_code_update(); |
631 | ||
f50f23d9 DG |
632 | /* |
633 | * Send status code to session daemon only if the recv works. If the | |
634 | * above recv() failed, the session daemon is notified through the | |
635 | * error socket and the teardown is eventually done. | |
636 | */ | |
637 | ret = consumer_send_status_msg(sock, ret_code); | |
638 | if (ret < 0) { | |
639 | /* Somehow, the session daemon is not responding anymore. */ | |
640 | goto end_nosignal; | |
641 | } | |
642 | ||
9ce5646a MD |
643 | health_code_update(); |
644 | ||
ffe60014 DG |
645 | new_stream = consumer_allocate_stream(channel->key, |
646 | fd, | |
647 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
648 | channel->name, | |
649 | channel->uid, | |
650 | channel->gid, | |
651 | channel->relayd_id, | |
652 | channel->session_id, | |
653 | msg.u.stream.cpu, | |
654 | &alloc_ret, | |
4891ece8 DG |
655 | channel->type, |
656 | channel->monitor); | |
3bd1e081 | 657 | if (new_stream == NULL) { |
c80048c6 MD |
658 | switch (alloc_ret) { |
659 | case -ENOMEM: | |
660 | case -EINVAL: | |
661 | default: | |
662 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
663 | break; | |
c80048c6 | 664 | } |
3f8e211f | 665 | goto end_nosignal; |
3bd1e081 | 666 | } |
d771f832 | 667 | |
ffe60014 DG |
668 | new_stream->chan = channel; |
669 | new_stream->wait_fd = fd; | |
07b86b52 JD |
670 | switch (channel->output) { |
671 | case CONSUMER_CHANNEL_SPLICE: | |
672 | new_stream->output = LTTNG_EVENT_SPLICE; | |
a2361a61 JD |
673 | ret = utils_create_pipe(new_stream->splice_pipe); |
674 | if (ret < 0) { | |
675 | goto end_nosignal; | |
676 | } | |
07b86b52 JD |
677 | break; |
678 | case CONSUMER_CHANNEL_MMAP: | |
679 | new_stream->output = LTTNG_EVENT_MMAP; | |
680 | break; | |
681 | default: | |
682 | ERR("Stream output unknown %d", channel->output); | |
683 | goto end_nosignal; | |
684 | } | |
00e2e675 | 685 | |
a0c83db9 DG |
686 | /* |
687 | * We've just assigned the channel to the stream so increment the | |
07b86b52 JD |
688 | * refcount right now. We don't need to increment the refcount for |
689 | * streams in no monitor because we handle manually the cleanup of | |
690 | * those. It is very important to make sure there is NO prior | |
691 | * consumer_del_stream() calls or else the refcount will be unbalanced. | |
a0c83db9 | 692 | */ |
07b86b52 JD |
693 | if (channel->monitor) { |
694 | uatomic_inc(&new_stream->chan->refcount); | |
695 | } | |
9d9353f9 | 696 | |
fb3a43a9 DG |
697 | /* |
698 | * The buffer flush is done on the session daemon side for the kernel | |
699 | * so no need for the stream "hangup_flush_done" variable to be | |
700 | * tracked. This is important for a kernel stream since we don't rely | |
701 | * on the flush state of the stream to read data. It's not the case for | |
702 | * user space tracing. | |
703 | */ | |
704 | new_stream->hangup_flush_done = 0; | |
705 | ||
9ce5646a MD |
706 | health_code_update(); |
707 | ||
633d0084 DG |
708 | if (ctx->on_recv_stream) { |
709 | ret = ctx->on_recv_stream(new_stream); | |
710 | if (ret < 0) { | |
d771f832 | 711 | consumer_stream_free(new_stream); |
633d0084 | 712 | goto end_nosignal; |
fb3a43a9 | 713 | } |
633d0084 | 714 | } |
fb3a43a9 | 715 | |
9ce5646a MD |
716 | health_code_update(); |
717 | ||
07b86b52 JD |
718 | if (new_stream->metadata_flag) { |
719 | channel->metadata_stream = new_stream; | |
720 | } | |
721 | ||
2bba9e53 DG |
722 | /* Do not monitor this stream. */ |
723 | if (!channel->monitor) { | |
5eecee74 | 724 | DBG("Kernel consumer add stream %s in no monitor mode with " |
6dc3064a | 725 | "relayd id %" PRIu64, new_stream->name, |
5eecee74 | 726 | new_stream->net_seq_idx); |
10a50311 | 727 | cds_list_add(&new_stream->send_node, &channel->streams.head); |
6dc3064a DG |
728 | break; |
729 | } | |
730 | ||
e1b71bdc DG |
731 | /* Send stream to relayd if the stream has an ID. */ |
732 | if (new_stream->net_seq_idx != (uint64_t) -1ULL) { | |
194ee077 DG |
733 | ret = consumer_send_relayd_stream(new_stream, |
734 | new_stream->chan->pathname); | |
e1b71bdc DG |
735 | if (ret < 0) { |
736 | consumer_stream_free(new_stream); | |
737 | goto end_nosignal; | |
738 | } | |
7881b1c4 MD |
739 | |
740 | /* | |
741 | * If adding an extra stream to an already | |
742 | * existing channel (e.g. cpu hotplug), we need | |
743 | * to send the "streams_sent" command to relayd. | |
744 | */ | |
745 | if (channel->streams_sent_to_relayd) { | |
746 | ret = consumer_send_relayd_streams_sent( | |
747 | new_stream->net_seq_idx); | |
748 | if (ret < 0) { | |
749 | goto end_nosignal; | |
750 | } | |
751 | } | |
e2039c7a JD |
752 | } |
753 | ||
50f8ae69 | 754 | /* Get the right pipe where the stream will be sent. */ |
633d0084 | 755 | if (new_stream->metadata_flag) { |
5ab66908 MD |
756 | ret = consumer_add_metadata_stream(new_stream); |
757 | if (ret) { | |
758 | ERR("Consumer add metadata 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_metadata_pipe; |
3bd1e081 | 764 | } else { |
5ab66908 MD |
765 | ret = consumer_add_data_stream(new_stream); |
766 | if (ret) { | |
767 | ERR("Consumer add stream %" PRIu64 " failed. Continuing", | |
768 | new_stream->key); | |
769 | consumer_stream_free(new_stream); | |
770 | goto end_nosignal; | |
771 | } | |
dae10966 | 772 | stream_pipe = ctx->consumer_data_pipe; |
50f8ae69 DG |
773 | } |
774 | ||
5ab66908 MD |
775 | /* Vitible to other threads */ |
776 | new_stream->globally_visible = 1; | |
777 | ||
9ce5646a MD |
778 | health_code_update(); |
779 | ||
dae10966 | 780 | ret = lttng_pipe_write(stream_pipe, &new_stream, sizeof(new_stream)); |
50f8ae69 | 781 | if (ret < 0) { |
dae10966 | 782 | ERR("Consumer write %s stream to pipe %d", |
50f8ae69 | 783 | new_stream->metadata_flag ? "metadata" : "data", |
dae10966 | 784 | lttng_pipe_get_writefd(stream_pipe)); |
5ab66908 MD |
785 | if (new_stream->metadata_flag) { |
786 | consumer_del_stream_for_metadata(new_stream); | |
787 | } else { | |
788 | consumer_del_stream_for_data(new_stream); | |
789 | } | |
50f8ae69 | 790 | goto end_nosignal; |
3bd1e081 | 791 | } |
00e2e675 | 792 | |
50f8ae69 | 793 | DBG("Kernel consumer ADD_STREAM %s (fd: %d) with relayd id %" PRIu64, |
ffe60014 | 794 | new_stream->name, fd, new_stream->relayd_stream_id); |
3bd1e081 MD |
795 | break; |
796 | } | |
a4baae1b JD |
797 | case LTTNG_CONSUMER_STREAMS_SENT: |
798 | { | |
799 | struct lttng_consumer_channel *channel; | |
800 | ||
801 | /* | |
802 | * Get stream's channel reference. Needed when adding the stream to the | |
803 | * global hash table. | |
804 | */ | |
805 | channel = consumer_find_channel(msg.u.sent_streams.channel_key); | |
806 | if (!channel) { | |
807 | /* | |
808 | * We could not find the channel. Can happen if cpu hotplug | |
809 | * happens while tearing down. | |
810 | */ | |
811 | ERR("Unable to find channel key %" PRIu64, | |
812 | msg.u.sent_streams.channel_key); | |
e462382a | 813 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
a4baae1b JD |
814 | } |
815 | ||
816 | health_code_update(); | |
817 | ||
818 | /* | |
819 | * Send status code to session daemon. | |
820 | */ | |
821 | ret = consumer_send_status_msg(sock, ret_code); | |
f261ad0a | 822 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
a4baae1b JD |
823 | /* Somehow, the session daemon is not responding anymore. */ |
824 | goto end_nosignal; | |
825 | } | |
826 | ||
827 | health_code_update(); | |
828 | ||
829 | /* | |
830 | * We should not send this message if we don't monitor the | |
831 | * streams in this channel. | |
832 | */ | |
833 | if (!channel->monitor) { | |
834 | break; | |
835 | } | |
836 | ||
837 | health_code_update(); | |
838 | /* Send stream to relayd if the stream has an ID. */ | |
839 | if (msg.u.sent_streams.net_seq_idx != (uint64_t) -1ULL) { | |
840 | ret = consumer_send_relayd_streams_sent( | |
841 | msg.u.sent_streams.net_seq_idx); | |
842 | if (ret < 0) { | |
843 | goto end_nosignal; | |
844 | } | |
7881b1c4 | 845 | channel->streams_sent_to_relayd = true; |
a4baae1b JD |
846 | } |
847 | break; | |
848 | } | |
3bd1e081 MD |
849 | case LTTNG_CONSUMER_UPDATE_STREAM: |
850 | { | |
3f8e211f DG |
851 | rcu_read_unlock(); |
852 | return -ENOSYS; | |
853 | } | |
854 | case LTTNG_CONSUMER_DESTROY_RELAYD: | |
855 | { | |
a6ba4fe1 | 856 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
3f8e211f DG |
857 | struct consumer_relayd_sock_pair *relayd; |
858 | ||
a6ba4fe1 | 859 | DBG("Kernel consumer destroying relayd %" PRIu64, index); |
3f8e211f DG |
860 | |
861 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 862 | relayd = consumer_find_relayd(index); |
3f8e211f | 863 | if (relayd == NULL) { |
3448e266 | 864 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 865 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
3bd1e081 | 866 | } |
3f8e211f | 867 | |
a6ba4fe1 DG |
868 | /* |
869 | * Each relayd socket pair has a refcount of stream attached to it | |
870 | * which tells if the relayd is still active or not depending on the | |
871 | * refcount value. | |
872 | * | |
873 | * This will set the destroy flag of the relayd object and destroy it | |
874 | * if the refcount reaches zero when called. | |
875 | * | |
876 | * The destroy can happen either here or when a stream fd hangs up. | |
877 | */ | |
f50f23d9 DG |
878 | if (relayd) { |
879 | consumer_flag_relayd_for_destroy(relayd); | |
880 | } | |
881 | ||
9ce5646a MD |
882 | health_code_update(); |
883 | ||
f50f23d9 DG |
884 | ret = consumer_send_status_msg(sock, ret_code); |
885 | if (ret < 0) { | |
886 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 887 | goto error_fatal; |
f50f23d9 | 888 | } |
3f8e211f | 889 | |
3f8e211f | 890 | goto end_nosignal; |
3bd1e081 | 891 | } |
6d805429 | 892 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 893 | { |
c8f59ee5 | 894 | int32_t ret; |
6d805429 | 895 | uint64_t id = msg.u.data_pending.session_id; |
c8f59ee5 | 896 | |
6d805429 | 897 | DBG("Kernel consumer data pending command for id %" PRIu64, id); |
c8f59ee5 | 898 | |
6d805429 | 899 | ret = consumer_data_pending(id); |
c8f59ee5 | 900 | |
9ce5646a MD |
901 | health_code_update(); |
902 | ||
c8f59ee5 DG |
903 | /* Send back returned value to session daemon */ |
904 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
905 | if (ret < 0) { | |
6d805429 | 906 | PERROR("send data pending ret code"); |
1803a064 | 907 | goto error_fatal; |
c8f59ee5 | 908 | } |
f50f23d9 DG |
909 | |
910 | /* | |
911 | * No need to send back a status message since the data pending | |
912 | * returned value is the response. | |
913 | */ | |
c8f59ee5 | 914 | break; |
53632229 | 915 | } |
6dc3064a DG |
916 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
917 | { | |
07b86b52 JD |
918 | if (msg.u.snapshot_channel.metadata == 1) { |
919 | ret = lttng_kconsumer_snapshot_metadata(msg.u.snapshot_channel.key, | |
e2039c7a JD |
920 | msg.u.snapshot_channel.pathname, |
921 | msg.u.snapshot_channel.relayd_id, ctx); | |
07b86b52 JD |
922 | if (ret < 0) { |
923 | ERR("Snapshot metadata failed"); | |
e462382a | 924 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; |
07b86b52 JD |
925 | } |
926 | } else { | |
927 | ret = lttng_kconsumer_snapshot_channel(msg.u.snapshot_channel.key, | |
928 | msg.u.snapshot_channel.pathname, | |
5c786ded | 929 | msg.u.snapshot_channel.relayd_id, |
d07ceecd | 930 | msg.u.snapshot_channel.nb_packets_per_stream, |
5c786ded | 931 | ctx); |
07b86b52 JD |
932 | if (ret < 0) { |
933 | ERR("Snapshot channel failed"); | |
e462382a | 934 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
07b86b52 JD |
935 | } |
936 | } | |
937 | ||
9ce5646a MD |
938 | health_code_update(); |
939 | ||
6dc3064a DG |
940 | ret = consumer_send_status_msg(sock, ret_code); |
941 | if (ret < 0) { | |
942 | /* Somehow, the session daemon is not responding anymore. */ | |
943 | goto end_nosignal; | |
944 | } | |
945 | break; | |
946 | } | |
07b86b52 JD |
947 | case LTTNG_CONSUMER_DESTROY_CHANNEL: |
948 | { | |
949 | uint64_t key = msg.u.destroy_channel.key; | |
950 | struct lttng_consumer_channel *channel; | |
951 | ||
952 | channel = consumer_find_channel(key); | |
953 | if (!channel) { | |
954 | ERR("Kernel consumer destroy channel %" PRIu64 " not found", key); | |
e462382a | 955 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
07b86b52 JD |
956 | } |
957 | ||
9ce5646a MD |
958 | health_code_update(); |
959 | ||
07b86b52 JD |
960 | ret = consumer_send_status_msg(sock, ret_code); |
961 | if (ret < 0) { | |
962 | /* Somehow, the session daemon is not responding anymore. */ | |
963 | goto end_nosignal; | |
964 | } | |
965 | ||
9ce5646a MD |
966 | health_code_update(); |
967 | ||
15dc512a DG |
968 | /* Stop right now if no channel was found. */ |
969 | if (!channel) { | |
970 | goto end_nosignal; | |
971 | } | |
972 | ||
07b86b52 JD |
973 | /* |
974 | * This command should ONLY be issued for channel with streams set in | |
975 | * no monitor mode. | |
976 | */ | |
977 | assert(!channel->monitor); | |
978 | ||
979 | /* | |
980 | * The refcount should ALWAYS be 0 in the case of a channel in no | |
981 | * monitor mode. | |
982 | */ | |
983 | assert(!uatomic_sub_return(&channel->refcount, 1)); | |
984 | ||
985 | consumer_del_channel(channel); | |
986 | ||
987 | goto end_nosignal; | |
988 | } | |
fb83fe64 JD |
989 | case LTTNG_CONSUMER_DISCARDED_EVENTS: |
990 | { | |
991 | uint64_t ret; | |
992 | struct lttng_consumer_channel *channel; | |
993 | uint64_t id = msg.u.discarded_events.session_id; | |
994 | uint64_t key = msg.u.discarded_events.channel_key; | |
995 | ||
bf181b05 MD |
996 | DBG("Kernel consumer discarded events command for session id %" |
997 | PRIu64 ", channel key %" PRIu64, id, key); | |
998 | ||
fb83fe64 JD |
999 | channel = consumer_find_channel(key); |
1000 | if (!channel) { | |
1001 | ERR("Kernel consumer discarded events channel %" | |
1002 | PRIu64 " not found", key); | |
bf181b05 MD |
1003 | ret = 0; |
1004 | } else { | |
1005 | ret = channel->discarded_events; | |
fb83fe64 JD |
1006 | } |
1007 | ||
fb83fe64 JD |
1008 | health_code_update(); |
1009 | ||
1010 | /* Send back returned value to session daemon */ | |
1011 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
1012 | if (ret < 0) { | |
1013 | PERROR("send discarded events"); | |
1014 | goto error_fatal; | |
1015 | } | |
1016 | ||
1017 | break; | |
1018 | } | |
1019 | case LTTNG_CONSUMER_LOST_PACKETS: | |
1020 | { | |
1021 | uint64_t ret; | |
1022 | struct lttng_consumer_channel *channel; | |
1023 | uint64_t id = msg.u.lost_packets.session_id; | |
1024 | uint64_t key = msg.u.lost_packets.channel_key; | |
1025 | ||
bf181b05 MD |
1026 | DBG("Kernel consumer lost packets command for session id %" |
1027 | PRIu64 ", channel key %" PRIu64, id, key); | |
1028 | ||
fb83fe64 JD |
1029 | channel = consumer_find_channel(key); |
1030 | if (!channel) { | |
1031 | ERR("Kernel consumer lost packets channel %" | |
1032 | PRIu64 " not found", key); | |
bf181b05 MD |
1033 | ret = 0; |
1034 | } else { | |
1035 | ret = channel->lost_packets; | |
fb83fe64 JD |
1036 | } |
1037 | ||
fb83fe64 JD |
1038 | health_code_update(); |
1039 | ||
1040 | /* Send back returned value to session daemon */ | |
1041 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
1042 | if (ret < 0) { | |
1043 | PERROR("send lost packets"); | |
1044 | goto error_fatal; | |
1045 | } | |
1046 | ||
1047 | break; | |
1048 | } | |
3bd1e081 | 1049 | default: |
3f8e211f | 1050 | goto end_nosignal; |
3bd1e081 | 1051 | } |
3f8e211f | 1052 | |
3bd1e081 | 1053 | end_nosignal: |
b0b335c8 | 1054 | rcu_read_unlock(); |
4cbc1a04 DG |
1055 | |
1056 | /* | |
1057 | * Return 1 to indicate success since the 0 value can be a socket | |
1058 | * shutdown during the recv() or send() call. | |
1059 | */ | |
9ce5646a | 1060 | health_code_update(); |
4cbc1a04 | 1061 | return 1; |
1803a064 MD |
1062 | |
1063 | error_fatal: | |
1064 | rcu_read_unlock(); | |
1065 | /* This will issue a consumer stop. */ | |
1066 | return -1; | |
3bd1e081 | 1067 | } |
d41f73b7 | 1068 | |
309167d2 JD |
1069 | /* |
1070 | * Populate index values of a kernel stream. Values are set in big endian order. | |
1071 | * | |
1072 | * Return 0 on success or else a negative value. | |
1073 | */ | |
50adc264 | 1074 | static int get_index_values(struct ctf_packet_index *index, int infd) |
309167d2 JD |
1075 | { |
1076 | int ret; | |
1077 | ||
1078 | ret = kernctl_get_timestamp_begin(infd, &index->timestamp_begin); | |
1079 | if (ret < 0) { | |
1080 | PERROR("kernctl_get_timestamp_begin"); | |
1081 | goto error; | |
1082 | } | |
1083 | index->timestamp_begin = htobe64(index->timestamp_begin); | |
1084 | ||
1085 | ret = kernctl_get_timestamp_end(infd, &index->timestamp_end); | |
1086 | if (ret < 0) { | |
1087 | PERROR("kernctl_get_timestamp_end"); | |
1088 | goto error; | |
1089 | } | |
1090 | index->timestamp_end = htobe64(index->timestamp_end); | |
1091 | ||
1092 | ret = kernctl_get_events_discarded(infd, &index->events_discarded); | |
1093 | if (ret < 0) { | |
1094 | PERROR("kernctl_get_events_discarded"); | |
1095 | goto error; | |
1096 | } | |
1097 | index->events_discarded = htobe64(index->events_discarded); | |
1098 | ||
1099 | ret = kernctl_get_content_size(infd, &index->content_size); | |
1100 | if (ret < 0) { | |
1101 | PERROR("kernctl_get_content_size"); | |
1102 | goto error; | |
1103 | } | |
1104 | index->content_size = htobe64(index->content_size); | |
1105 | ||
1106 | ret = kernctl_get_packet_size(infd, &index->packet_size); | |
1107 | if (ret < 0) { | |
1108 | PERROR("kernctl_get_packet_size"); | |
1109 | goto error; | |
1110 | } | |
1111 | index->packet_size = htobe64(index->packet_size); | |
1112 | ||
1113 | ret = kernctl_get_stream_id(infd, &index->stream_id); | |
1114 | if (ret < 0) { | |
1115 | PERROR("kernctl_get_stream_id"); | |
1116 | goto error; | |
1117 | } | |
1118 | index->stream_id = htobe64(index->stream_id); | |
1119 | ||
234cd636 JD |
1120 | ret = kernctl_get_instance_id(infd, &index->stream_instance_id); |
1121 | if (ret < 0) { | |
912a3957 MD |
1122 | if (ret == -ENOTTY) { |
1123 | /* Command not implemented by lttng-modules. */ | |
1124 | index->stream_instance_id = -1ULL; | |
1125 | ret = 0; | |
1126 | } else { | |
1127 | PERROR("kernctl_get_instance_id"); | |
1128 | goto error; | |
1129 | } | |
234cd636 JD |
1130 | } |
1131 | index->stream_instance_id = htobe64(index->stream_instance_id); | |
1132 | ||
1133 | ret = kernctl_get_sequence_number(infd, &index->packet_seq_num); | |
1134 | if (ret < 0) { | |
912a3957 MD |
1135 | if (ret == -ENOTTY) { |
1136 | /* Command not implemented by lttng-modules. */ | |
1137 | index->packet_seq_num = -1ULL; | |
1138 | ret = 0; | |
1139 | } else { | |
1140 | PERROR("kernctl_get_sequence_number"); | |
1141 | goto error; | |
1142 | } | |
234cd636 JD |
1143 | } |
1144 | index->packet_seq_num = htobe64(index->packet_seq_num); | |
1145 | ||
309167d2 JD |
1146 | error: |
1147 | return ret; | |
1148 | } | |
94d49140 JD |
1149 | /* |
1150 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
1151 | * metadata thread can consumer them. | |
1152 | * | |
1153 | * Metadata stream lock MUST be acquired. | |
1154 | * | |
1155 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream | |
1156 | * is empty or a negative value on error. | |
1157 | */ | |
1158 | int lttng_kconsumer_sync_metadata(struct lttng_consumer_stream *metadata) | |
1159 | { | |
1160 | int ret; | |
1161 | ||
1162 | assert(metadata); | |
1163 | ||
1164 | ret = kernctl_buffer_flush(metadata->wait_fd); | |
1165 | if (ret < 0) { | |
1166 | ERR("Failed to flush kernel stream"); | |
1167 | goto end; | |
1168 | } | |
1169 | ||
1170 | ret = kernctl_snapshot(metadata->wait_fd); | |
1171 | if (ret < 0) { | |
1172 | if (errno != EAGAIN) { | |
1173 | ERR("Sync metadata, taking kernel snapshot failed."); | |
1174 | goto end; | |
1175 | } | |
1176 | DBG("Sync metadata, no new kernel metadata"); | |
1177 | /* No new metadata, exit. */ | |
1178 | ret = ENODATA; | |
1179 | goto end; | |
1180 | } | |
1181 | ||
1182 | end: | |
1183 | return ret; | |
1184 | } | |
309167d2 | 1185 | |
fb83fe64 JD |
1186 | static |
1187 | int update_stream_stats(struct lttng_consumer_stream *stream) | |
1188 | { | |
1189 | int ret; | |
1190 | uint64_t seq, discarded; | |
1191 | ||
1192 | ret = kernctl_get_sequence_number(stream->wait_fd, &seq); | |
1193 | if (ret < 0) { | |
912a3957 MD |
1194 | if (ret == -ENOTTY) { |
1195 | /* Command not implemented by lttng-modules. */ | |
1196 | seq = -1ULL; | |
1197 | ret = 0; | |
1198 | } else { | |
1199 | PERROR("kernctl_get_sequence_number"); | |
1200 | goto end; | |
1201 | } | |
fb83fe64 JD |
1202 | } |
1203 | ||
1204 | /* | |
1205 | * Start the sequence when we extract the first packet in case we don't | |
1206 | * start at 0 (for example if a consumer is not connected to the | |
1207 | * session immediately after the beginning). | |
1208 | */ | |
1209 | if (stream->last_sequence_number == -1ULL) { | |
1210 | stream->last_sequence_number = seq; | |
1211 | } else if (seq > stream->last_sequence_number) { | |
1212 | stream->chan->lost_packets += seq - | |
1213 | stream->last_sequence_number - 1; | |
1214 | } else { | |
1215 | /* seq <= last_sequence_number */ | |
1216 | ERR("Sequence number inconsistent : prev = %" PRIu64 | |
1217 | ", current = %" PRIu64, | |
1218 | stream->last_sequence_number, seq); | |
1219 | ret = -1; | |
1220 | goto end; | |
1221 | } | |
1222 | stream->last_sequence_number = seq; | |
1223 | ||
1224 | ret = kernctl_get_events_discarded(stream->wait_fd, &discarded); | |
1225 | if (ret < 0) { | |
1226 | PERROR("kernctl_get_events_discarded"); | |
1227 | goto end; | |
1228 | } | |
1229 | if (discarded < stream->last_discarded_events) { | |
1230 | /* | |
fae1e3cc MJ |
1231 | * Overflow has occurred. We assume only one wrap-around |
1232 | * has occurred. | |
fb83fe64 JD |
1233 | */ |
1234 | stream->chan->discarded_events += (1ULL << (CAA_BITS_PER_LONG - 1)) - | |
1235 | stream->last_discarded_events + discarded; | |
1236 | } else { | |
1237 | stream->chan->discarded_events += discarded - | |
1238 | stream->last_discarded_events; | |
1239 | } | |
1240 | stream->last_discarded_events = discarded; | |
1241 | ret = 0; | |
1242 | ||
1243 | end: | |
1244 | return ret; | |
1245 | } | |
1246 | ||
93ec662e JD |
1247 | /* |
1248 | * Check if the local version of the metadata stream matches with the version | |
1249 | * of the metadata stream in the kernel. If it was updated, set the reset flag | |
1250 | * on the stream. | |
1251 | */ | |
1252 | static | |
1253 | int metadata_stream_check_version(int infd, struct lttng_consumer_stream *stream) | |
1254 | { | |
1255 | int ret; | |
1256 | uint64_t cur_version; | |
1257 | ||
1258 | ret = kernctl_get_metadata_version(infd, &cur_version); | |
1259 | if (ret < 0) { | |
912a3957 MD |
1260 | if (ret == -ENOTTY) { |
1261 | /* | |
1262 | * LTTng-modules does not implement this | |
1263 | * command. | |
1264 | */ | |
1265 | ret = 0; | |
1266 | goto end; | |
1267 | } | |
93ec662e JD |
1268 | ERR("Failed to get the metadata version"); |
1269 | goto end; | |
1270 | } | |
1271 | ||
1272 | if (stream->metadata_version == cur_version) { | |
1273 | ret = 0; | |
1274 | goto end; | |
1275 | } | |
1276 | ||
1277 | DBG("New metadata version detected"); | |
1278 | stream->metadata_version = cur_version; | |
1279 | stream->reset_metadata_flag = 1; | |
1280 | ret = 0; | |
1281 | ||
1282 | end: | |
1283 | return ret; | |
1284 | } | |
1285 | ||
d41f73b7 MD |
1286 | /* |
1287 | * Consume data on a file descriptor and write it on a trace file. | |
1288 | */ | |
4078b776 | 1289 | ssize_t lttng_kconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
1290 | struct lttng_consumer_local_data *ctx) |
1291 | { | |
1d4dfdef | 1292 | unsigned long len, subbuf_size, padding; |
1c20f0e2 | 1293 | int err, write_index = 1; |
4078b776 | 1294 | ssize_t ret = 0; |
d41f73b7 | 1295 | int infd = stream->wait_fd; |
50adc264 | 1296 | struct ctf_packet_index index; |
d41f73b7 MD |
1297 | |
1298 | DBG("In read_subbuffer (infd : %d)", infd); | |
309167d2 | 1299 | |
d41f73b7 MD |
1300 | /* Get the next subbuffer */ |
1301 | err = kernctl_get_next_subbuf(infd); | |
1302 | if (err != 0) { | |
d41f73b7 MD |
1303 | /* |
1304 | * This is a debug message even for single-threaded consumer, | |
1305 | * because poll() have more relaxed criterions than get subbuf, | |
1306 | * so get_subbuf may fail for short race windows where poll() | |
1307 | * would issue wakeups. | |
1308 | */ | |
1309 | DBG("Reserving sub buffer failed (everything is normal, " | |
1310 | "it is due to concurrency)"); | |
56591bac | 1311 | ret = -errno; |
d41f73b7 MD |
1312 | goto end; |
1313 | } | |
1314 | ||
1d4dfdef DG |
1315 | /* Get the full subbuffer size including padding */ |
1316 | err = kernctl_get_padded_subbuf_size(infd, &len); | |
1317 | if (err != 0) { | |
5a510c9f | 1318 | PERROR("Getting sub-buffer len failed."); |
8265f19e MD |
1319 | err = kernctl_put_subbuf(infd); |
1320 | if (err != 0) { | |
1321 | if (errno == EFAULT) { | |
5a510c9f | 1322 | PERROR("Error in unreserving sub buffer\n"); |
8265f19e MD |
1323 | } else if (errno == EIO) { |
1324 | /* Should never happen with newer LTTng versions */ | |
5a510c9f | 1325 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e MD |
1326 | } |
1327 | ret = -errno; | |
1328 | goto end; | |
1329 | } | |
56591bac | 1330 | ret = -errno; |
1d4dfdef DG |
1331 | goto end; |
1332 | } | |
1333 | ||
1c20f0e2 | 1334 | if (!stream->metadata_flag) { |
309167d2 JD |
1335 | ret = get_index_values(&index, infd); |
1336 | if (ret < 0) { | |
8265f19e MD |
1337 | err = kernctl_put_subbuf(infd); |
1338 | if (err != 0) { | |
1339 | if (errno == EFAULT) { | |
5a510c9f | 1340 | PERROR("Error in unreserving sub buffer\n"); |
8265f19e MD |
1341 | } else if (errno == EIO) { |
1342 | /* Should never happen with newer LTTng versions */ | |
5a510c9f | 1343 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e MD |
1344 | } |
1345 | ret = -errno; | |
1346 | goto end; | |
1347 | } | |
309167d2 JD |
1348 | goto end; |
1349 | } | |
fb83fe64 JD |
1350 | ret = update_stream_stats(stream); |
1351 | if (ret < 0) { | |
c3c60f7d MD |
1352 | err = kernctl_put_subbuf(infd); |
1353 | if (err != 0) { | |
1354 | if (err == -EFAULT) { | |
1355 | PERROR("Error in unreserving sub buffer\n"); | |
1356 | } else if (err == -EIO) { | |
1357 | /* Should never happen with newer LTTng versions */ | |
1358 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
1359 | } | |
1360 | ret = err; | |
1361 | goto end; | |
1362 | } | |
fb83fe64 JD |
1363 | goto end; |
1364 | } | |
1c20f0e2 JD |
1365 | } else { |
1366 | write_index = 0; | |
93ec662e JD |
1367 | ret = metadata_stream_check_version(infd, stream); |
1368 | if (ret < 0) { | |
c3c60f7d MD |
1369 | err = kernctl_put_subbuf(infd); |
1370 | if (err != 0) { | |
1371 | if (err == -EFAULT) { | |
1372 | PERROR("Error in unreserving sub buffer\n"); | |
1373 | } else if (err == -EIO) { | |
1374 | /* Should never happen with newer LTTng versions */ | |
1375 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
1376 | } | |
1377 | ret = err; | |
1378 | goto end; | |
1379 | } | |
93ec662e JD |
1380 | goto end; |
1381 | } | |
309167d2 JD |
1382 | } |
1383 | ||
ffe60014 | 1384 | switch (stream->chan->output) { |
07b86b52 | 1385 | case CONSUMER_CHANNEL_SPLICE: |
1d4dfdef DG |
1386 | /* |
1387 | * XXX: The lttng-modules splice "actor" does not handle copying | |
1388 | * partial pages hence only using the subbuffer size without the | |
1389 | * padding makes the splice fail. | |
1390 | */ | |
1391 | subbuf_size = len; | |
1392 | padding = 0; | |
1393 | ||
1394 | /* splice the subbuffer to the tracefile */ | |
91dfef6e | 1395 | ret = lttng_consumer_on_read_subbuffer_splice(ctx, stream, subbuf_size, |
309167d2 | 1396 | padding, &index); |
91dfef6e DG |
1397 | /* |
1398 | * XXX: Splice does not support network streaming so the return value | |
1399 | * is simply checked against subbuf_size and not like the mmap() op. | |
1400 | */ | |
1d4dfdef DG |
1401 | if (ret != subbuf_size) { |
1402 | /* | |
1403 | * display the error but continue processing to try | |
1404 | * to release the subbuffer | |
1405 | */ | |
1406 | ERR("Error splicing to tracefile (ret: %zd != len: %lu)", | |
1407 | ret, subbuf_size); | |
309167d2 | 1408 | write_index = 0; |
1d4dfdef DG |
1409 | } |
1410 | break; | |
07b86b52 | 1411 | case CONSUMER_CHANNEL_MMAP: |
1d4dfdef DG |
1412 | /* Get subbuffer size without padding */ |
1413 | err = kernctl_get_subbuf_size(infd, &subbuf_size); | |
1414 | if (err != 0) { | |
5a510c9f | 1415 | PERROR("Getting sub-buffer len failed."); |
8265f19e MD |
1416 | err = kernctl_put_subbuf(infd); |
1417 | if (err != 0) { | |
1418 | if (errno == EFAULT) { | |
5a510c9f | 1419 | PERROR("Error in unreserving sub buffer\n"); |
8265f19e MD |
1420 | } else if (errno == EIO) { |
1421 | /* Should never happen with newer LTTng versions */ | |
5a510c9f | 1422 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e MD |
1423 | } |
1424 | ret = -errno; | |
1425 | goto end; | |
1426 | } | |
56591bac | 1427 | ret = -errno; |
1d4dfdef DG |
1428 | goto end; |
1429 | } | |
47e81c02 | 1430 | |
1d4dfdef DG |
1431 | /* Make sure the tracer is not gone mad on us! */ |
1432 | assert(len >= subbuf_size); | |
1433 | ||
1434 | padding = len - subbuf_size; | |
1435 | ||
1436 | /* write the subbuffer to the tracefile */ | |
91dfef6e | 1437 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, |
309167d2 | 1438 | padding, &index); |
91dfef6e DG |
1439 | /* |
1440 | * The mmap operation should write subbuf_size amount of data when | |
1441 | * network streaming or the full padding (len) size when we are _not_ | |
1442 | * streaming. | |
1443 | */ | |
d88aee68 DG |
1444 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
1445 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
1d4dfdef | 1446 | /* |
91dfef6e | 1447 | * Display the error but continue processing to try to release the |
2336629e DG |
1448 | * subbuffer. This is a DBG statement since this is possible to |
1449 | * happen without being a critical error. | |
1d4dfdef | 1450 | */ |
2336629e | 1451 | DBG("Error writing to tracefile " |
91dfef6e DG |
1452 | "(ret: %zd != len: %lu != subbuf_size: %lu)", |
1453 | ret, len, subbuf_size); | |
309167d2 | 1454 | write_index = 0; |
1d4dfdef DG |
1455 | } |
1456 | break; | |
1457 | default: | |
1458 | ERR("Unknown output method"); | |
56591bac | 1459 | ret = -EPERM; |
d41f73b7 MD |
1460 | } |
1461 | ||
1462 | err = kernctl_put_next_subbuf(infd); | |
1463 | if (err != 0) { | |
d41f73b7 | 1464 | if (errno == EFAULT) { |
5a510c9f | 1465 | PERROR("Error in unreserving sub buffer\n"); |
d41f73b7 MD |
1466 | } else if (errno == EIO) { |
1467 | /* Should never happen with newer LTTng versions */ | |
5a510c9f | 1468 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
d41f73b7 | 1469 | } |
56591bac | 1470 | ret = -errno; |
d41f73b7 MD |
1471 | goto end; |
1472 | } | |
1473 | ||
309167d2 | 1474 | /* Write index if needed. */ |
1c20f0e2 JD |
1475 | if (!write_index) { |
1476 | goto end; | |
1477 | } | |
1478 | ||
94d49140 JD |
1479 | if (stream->chan->live_timer_interval && !stream->metadata_flag) { |
1480 | /* | |
1481 | * In live, block until all the metadata is sent. | |
1482 | */ | |
c585821b MD |
1483 | pthread_mutex_lock(&stream->metadata_timer_lock); |
1484 | assert(!stream->missed_metadata_flush); | |
1485 | stream->waiting_on_metadata = true; | |
1486 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1487 | ||
94d49140 | 1488 | err = consumer_stream_sync_metadata(ctx, stream->session_id); |
c585821b MD |
1489 | |
1490 | pthread_mutex_lock(&stream->metadata_timer_lock); | |
1491 | stream->waiting_on_metadata = false; | |
1492 | if (stream->missed_metadata_flush) { | |
1493 | stream->missed_metadata_flush = false; | |
1494 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1495 | (void) consumer_flush_kernel_index(stream); | |
1496 | } else { | |
1497 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1498 | } | |
94d49140 JD |
1499 | if (err < 0) { |
1500 | goto end; | |
1501 | } | |
1502 | } | |
1503 | ||
1c20f0e2 JD |
1504 | err = consumer_stream_write_index(stream, &index); |
1505 | if (err < 0) { | |
1506 | goto end; | |
309167d2 JD |
1507 | } |
1508 | ||
d41f73b7 MD |
1509 | end: |
1510 | return ret; | |
1511 | } | |
1512 | ||
1513 | int lttng_kconsumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
1514 | { | |
1515 | int ret; | |
ffe60014 DG |
1516 | |
1517 | assert(stream); | |
1518 | ||
2bba9e53 DG |
1519 | /* |
1520 | * Don't create anything if this is set for streaming or should not be | |
1521 | * monitored. | |
1522 | */ | |
1523 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { | |
fe4477ee JD |
1524 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
1525 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
309167d2 | 1526 | stream->uid, stream->gid, NULL); |
fe4477ee JD |
1527 | if (ret < 0) { |
1528 | goto error; | |
1529 | } | |
1530 | stream->out_fd = ret; | |
1531 | stream->tracefile_size_current = 0; | |
309167d2 JD |
1532 | |
1533 | if (!stream->metadata_flag) { | |
8dbd7d83 MD |
1534 | struct lttng_index_file *index_file; |
1535 | ||
1536 | index_file = lttng_index_file_create(stream->chan->pathname, | |
309167d2 JD |
1537 | stream->name, stream->uid, stream->gid, |
1538 | stream->chan->tracefile_size, | |
8dbd7d83 MD |
1539 | stream->tracefile_count_current, |
1540 | CTF_INDEX_MAJOR, CTF_INDEX_MINOR); | |
1541 | if (!index_file) { | |
309167d2 JD |
1542 | goto error; |
1543 | } | |
8dbd7d83 | 1544 | stream->index_file = index_file; |
309167d2 | 1545 | } |
ffe60014 | 1546 | } |
d41f73b7 | 1547 | |
d41f73b7 MD |
1548 | if (stream->output == LTTNG_EVENT_MMAP) { |
1549 | /* get the len of the mmap region */ | |
1550 | unsigned long mmap_len; | |
1551 | ||
1552 | ret = kernctl_get_mmap_len(stream->wait_fd, &mmap_len); | |
1553 | if (ret != 0) { | |
ffe60014 | 1554 | PERROR("kernctl_get_mmap_len"); |
56591bac | 1555 | ret = -errno; |
d41f73b7 MD |
1556 | goto error_close_fd; |
1557 | } | |
1558 | stream->mmap_len = (size_t) mmap_len; | |
1559 | ||
ffe60014 DG |
1560 | stream->mmap_base = mmap(NULL, stream->mmap_len, PROT_READ, |
1561 | MAP_PRIVATE, stream->wait_fd, 0); | |
d41f73b7 | 1562 | if (stream->mmap_base == MAP_FAILED) { |
ffe60014 | 1563 | PERROR("Error mmaping"); |
d41f73b7 MD |
1564 | ret = -1; |
1565 | goto error_close_fd; | |
1566 | } | |
1567 | } | |
1568 | ||
1569 | /* we return 0 to let the library handle the FD internally */ | |
1570 | return 0; | |
1571 | ||
1572 | error_close_fd: | |
2f225ce2 | 1573 | if (stream->out_fd >= 0) { |
d41f73b7 MD |
1574 | int err; |
1575 | ||
1576 | err = close(stream->out_fd); | |
1577 | assert(!err); | |
2f225ce2 | 1578 | stream->out_fd = -1; |
d41f73b7 MD |
1579 | } |
1580 | error: | |
1581 | return ret; | |
1582 | } | |
1583 | ||
ca22feea DG |
1584 | /* |
1585 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
1586 | * stream. Consumer data lock MUST be acquired before calling this function |
1587 | * and the stream lock. | |
ca22feea | 1588 | * |
6d805429 | 1589 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
1590 | * data is available for trace viewer reading. |
1591 | */ | |
6d805429 | 1592 | int lttng_kconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
1593 | { |
1594 | int ret; | |
1595 | ||
1596 | assert(stream); | |
1597 | ||
873b9e9a MD |
1598 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
1599 | ret = 0; | |
1600 | goto end; | |
1601 | } | |
1602 | ||
ca22feea DG |
1603 | ret = kernctl_get_next_subbuf(stream->wait_fd); |
1604 | if (ret == 0) { | |
1605 | /* There is still data so let's put back this subbuffer. */ | |
1606 | ret = kernctl_put_subbuf(stream->wait_fd); | |
1607 | assert(ret == 0); | |
6d805429 | 1608 | ret = 1; /* Data is pending */ |
4e9a4686 | 1609 | goto end; |
ca22feea DG |
1610 | } |
1611 | ||
6d805429 DG |
1612 | /* Data is NOT pending and ready to be read. */ |
1613 | ret = 0; | |
ca22feea | 1614 | |
6efae65e DG |
1615 | end: |
1616 | return ret; | |
ca22feea | 1617 | } |