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."); |
3bd1e081 MD |
65 | } |
66 | ||
67 | return ret; | |
68 | } | |
69 | ||
70 | /* | |
71 | * Get the produced position | |
72 | * | |
73 | * Returns 0 on success, < 0 on error | |
74 | */ | |
ffe60014 | 75 | int lttng_kconsumer_get_produced_snapshot(struct lttng_consumer_stream *stream, |
3bd1e081 MD |
76 | unsigned long *pos) |
77 | { | |
78 | int ret; | |
79 | int infd = stream->wait_fd; | |
80 | ||
81 | ret = kernctl_snapshot_get_produced(infd, pos); | |
82 | if (ret != 0) { | |
5a510c9f | 83 | PERROR("kernctl_snapshot_get_produced"); |
3bd1e081 MD |
84 | } |
85 | ||
86 | return ret; | |
87 | } | |
88 | ||
07b86b52 JD |
89 | /* |
90 | * Get the consumerd position | |
91 | * | |
92 | * Returns 0 on success, < 0 on error | |
93 | */ | |
94 | int lttng_kconsumer_get_consumed_snapshot(struct lttng_consumer_stream *stream, | |
95 | unsigned long *pos) | |
96 | { | |
97 | int ret; | |
98 | int infd = stream->wait_fd; | |
99 | ||
100 | ret = kernctl_snapshot_get_consumed(infd, pos); | |
101 | if (ret != 0) { | |
5a510c9f | 102 | PERROR("kernctl_snapshot_get_consumed"); |
07b86b52 JD |
103 | } |
104 | ||
105 | return ret; | |
106 | } | |
107 | ||
07b86b52 JD |
108 | /* |
109 | * Take a snapshot of all the stream of a channel | |
110 | * | |
111 | * Returns 0 on success, < 0 on error | |
112 | */ | |
113 | int lttng_kconsumer_snapshot_channel(uint64_t key, char *path, | |
d07ceecd | 114 | uint64_t relayd_id, uint64_t nb_packets_per_stream, |
5c786ded | 115 | struct lttng_consumer_local_data *ctx) |
07b86b52 JD |
116 | { |
117 | int ret; | |
07b86b52 JD |
118 | struct lttng_consumer_channel *channel; |
119 | struct lttng_consumer_stream *stream; | |
120 | ||
6a00837f | 121 | DBG("Kernel consumer snapshot channel %" PRIu64, key); |
07b86b52 JD |
122 | |
123 | rcu_read_lock(); | |
124 | ||
125 | channel = consumer_find_channel(key); | |
126 | if (!channel) { | |
6a00837f | 127 | ERR("No channel found for key %" PRIu64, key); |
07b86b52 JD |
128 | ret = -1; |
129 | goto end; | |
130 | } | |
131 | ||
132 | /* Splice is not supported yet for channel snapshot. */ | |
133 | if (channel->output != CONSUMER_CHANNEL_MMAP) { | |
134 | ERR("Unsupported output %d", channel->output); | |
135 | ret = -1; | |
136 | goto end; | |
137 | } | |
138 | ||
10a50311 | 139 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { |
c13082a9 JD |
140 | /* Are we at a position _before_ the first available packet ? */ |
141 | bool before_first_packet = true; | |
923333cd | 142 | unsigned long consumed_pos, produced_pos; |
9ce5646a MD |
143 | |
144 | health_code_update(); | |
145 | ||
07b86b52 JD |
146 | /* |
147 | * Lock stream because we are about to change its state. | |
148 | */ | |
149 | pthread_mutex_lock(&stream->lock); | |
150 | ||
29decac3 DG |
151 | /* |
152 | * Assign the received relayd ID so we can use it for streaming. The streams | |
153 | * are not visible to anyone so this is OK to change it. | |
154 | */ | |
07b86b52 JD |
155 | stream->net_seq_idx = relayd_id; |
156 | channel->relayd_id = relayd_id; | |
157 | if (relayd_id != (uint64_t) -1ULL) { | |
10a50311 | 158 | ret = consumer_send_relayd_stream(stream, path); |
07b86b52 JD |
159 | if (ret < 0) { |
160 | ERR("sending stream to relayd"); | |
161 | goto end_unlock; | |
162 | } | |
07b86b52 JD |
163 | } else { |
164 | ret = utils_create_stream_file(path, stream->name, | |
10a50311 JD |
165 | stream->chan->tracefile_size, |
166 | stream->tracefile_count_current, | |
309167d2 | 167 | stream->uid, stream->gid, NULL); |
07b86b52 JD |
168 | if (ret < 0) { |
169 | ERR("utils_create_stream_file"); | |
170 | goto end_unlock; | |
171 | } | |
172 | ||
173 | stream->out_fd = ret; | |
174 | stream->tracefile_size_current = 0; | |
175 | ||
81ea21bf MD |
176 | DBG("Kernel consumer snapshot stream %s/%s (%" PRIu64 ")", |
177 | path, stream->name, stream->key); | |
07b86b52 | 178 | } |
601262d6 JD |
179 | if (relayd_id != -1ULL) { |
180 | ret = consumer_send_relayd_streams_sent(relayd_id); | |
181 | if (ret < 0) { | |
182 | ERR("sending streams sent to relayd"); | |
183 | goto end_unlock; | |
184 | } | |
b7fa98e6 | 185 | channel->streams_sent_to_relayd = true; |
a4baae1b | 186 | } |
07b86b52 | 187 | |
612b8ed8 | 188 | ret = kernctl_buffer_flush_empty(stream->wait_fd); |
07b86b52 | 189 | if (ret < 0) { |
612b8ed8 MD |
190 | /* |
191 | * Doing a buffer flush which does not take into | |
192 | * account empty packets. This is not perfect | |
193 | * for stream intersection, but required as a | |
194 | * fall-back when "flush_empty" is not | |
195 | * implemented by lttng-modules. | |
196 | */ | |
197 | ret = kernctl_buffer_flush(stream->wait_fd); | |
198 | if (ret < 0) { | |
199 | ERR("Failed to flush kernel stream"); | |
200 | goto end_unlock; | |
201 | } | |
07b86b52 JD |
202 | goto end_unlock; |
203 | } | |
204 | ||
205 | ret = lttng_kconsumer_take_snapshot(stream); | |
206 | if (ret < 0) { | |
207 | ERR("Taking kernel snapshot"); | |
208 | goto end_unlock; | |
209 | } | |
210 | ||
211 | ret = lttng_kconsumer_get_produced_snapshot(stream, &produced_pos); | |
212 | if (ret < 0) { | |
213 | ERR("Produced kernel snapshot position"); | |
214 | goto end_unlock; | |
215 | } | |
216 | ||
217 | ret = lttng_kconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
218 | if (ret < 0) { | |
219 | ERR("Consumerd kernel snapshot position"); | |
220 | goto end_unlock; | |
221 | } | |
222 | ||
223 | if (stream->max_sb_size == 0) { | |
224 | ret = kernctl_get_max_subbuf_size(stream->wait_fd, | |
225 | &stream->max_sb_size); | |
226 | if (ret < 0) { | |
227 | ERR("Getting kernel max_sb_size"); | |
228 | goto end_unlock; | |
229 | } | |
230 | } | |
231 | ||
d07ceecd MD |
232 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
233 | produced_pos, nb_packets_per_stream, | |
234 | stream->max_sb_size); | |
5c786ded | 235 | |
07b86b52 JD |
236 | while (consumed_pos < produced_pos) { |
237 | ssize_t read_len; | |
238 | unsigned long len, padded_len; | |
c13082a9 | 239 | int lost_packet = 0; |
07b86b52 | 240 | |
9ce5646a MD |
241 | health_code_update(); |
242 | ||
07b86b52 JD |
243 | DBG("Kernel consumer taking snapshot at pos %lu", consumed_pos); |
244 | ||
245 | ret = kernctl_get_subbuf(stream->wait_fd, &consumed_pos); | |
246 | if (ret < 0) { | |
32af2c95 | 247 | if (ret != -EAGAIN) { |
07b86b52 JD |
248 | PERROR("kernctl_get_subbuf snapshot"); |
249 | goto end_unlock; | |
250 | } | |
251 | DBG("Kernel consumer get subbuf failed. Skipping it."); | |
252 | consumed_pos += stream->max_sb_size; | |
c13082a9 JD |
253 | |
254 | /* | |
255 | * Start accounting lost packets only when we | |
256 | * already have extracted packets (to match the | |
257 | * content of the final snapshot). | |
258 | */ | |
259 | if (!before_first_packet) { | |
260 | lost_packet = 1; | |
261 | } | |
07b86b52 JD |
262 | continue; |
263 | } | |
264 | ||
265 | ret = kernctl_get_subbuf_size(stream->wait_fd, &len); | |
266 | if (ret < 0) { | |
267 | ERR("Snapshot kernctl_get_subbuf_size"); | |
29decac3 | 268 | goto error_put_subbuf; |
07b86b52 JD |
269 | } |
270 | ||
271 | ret = kernctl_get_padded_subbuf_size(stream->wait_fd, &padded_len); | |
272 | if (ret < 0) { | |
273 | ERR("Snapshot kernctl_get_padded_subbuf_size"); | |
29decac3 | 274 | goto error_put_subbuf; |
07b86b52 JD |
275 | } |
276 | ||
277 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
309167d2 | 278 | padded_len - len, NULL); |
07b86b52 | 279 | /* |
29decac3 DG |
280 | * We write the padded len in local tracefiles but the data len |
281 | * when using a relay. Display the error but continue processing | |
282 | * to try to release the subbuffer. | |
07b86b52 JD |
283 | */ |
284 | if (relayd_id != (uint64_t) -1ULL) { | |
285 | if (read_len != len) { | |
286 | ERR("Error sending to the relay (ret: %zd != len: %lu)", | |
287 | read_len, len); | |
288 | } | |
289 | } else { | |
290 | if (read_len != padded_len) { | |
291 | ERR("Error writing to tracefile (ret: %zd != len: %lu)", | |
292 | read_len, padded_len); | |
293 | } | |
294 | } | |
295 | ||
296 | ret = kernctl_put_subbuf(stream->wait_fd); | |
297 | if (ret < 0) { | |
298 | ERR("Snapshot kernctl_put_subbuf"); | |
299 | goto end_unlock; | |
300 | } | |
301 | consumed_pos += stream->max_sb_size; | |
c13082a9 JD |
302 | |
303 | /* | |
304 | * Only account lost packets located between | |
305 | * succesfully extracted packets (do not account before | |
306 | * and after since they are not visible in the | |
307 | * resulting snapshot). | |
308 | */ | |
309 | stream->chan->lost_packets += lost_packet; | |
310 | lost_packet = 0; | |
311 | before_first_packet = false; | |
07b86b52 JD |
312 | } |
313 | ||
314 | if (relayd_id == (uint64_t) -1ULL) { | |
fdf9986c MD |
315 | if (stream->out_fd >= 0) { |
316 | ret = close(stream->out_fd); | |
317 | if (ret < 0) { | |
318 | PERROR("Kernel consumer snapshot close out_fd"); | |
319 | goto end_unlock; | |
320 | } | |
321 | stream->out_fd = -1; | |
07b86b52 | 322 | } |
07b86b52 JD |
323 | } else { |
324 | close_relayd_stream(stream); | |
325 | stream->net_seq_idx = (uint64_t) -1ULL; | |
326 | } | |
327 | pthread_mutex_unlock(&stream->lock); | |
328 | } | |
329 | ||
330 | /* All good! */ | |
331 | ret = 0; | |
332 | goto end; | |
333 | ||
29decac3 DG |
334 | error_put_subbuf: |
335 | ret = kernctl_put_subbuf(stream->wait_fd); | |
336 | if (ret < 0) { | |
337 | ERR("Snapshot kernctl_put_subbuf error path"); | |
338 | } | |
07b86b52 JD |
339 | end_unlock: |
340 | pthread_mutex_unlock(&stream->lock); | |
341 | end: | |
342 | rcu_read_unlock(); | |
343 | return ret; | |
344 | } | |
345 | ||
346 | /* | |
347 | * Read the whole metadata available for a snapshot. | |
348 | * | |
349 | * Returns 0 on success, < 0 on error | |
350 | */ | |
351 | int lttng_kconsumer_snapshot_metadata(uint64_t key, char *path, | |
e2039c7a | 352 | uint64_t relayd_id, struct lttng_consumer_local_data *ctx) |
07b86b52 | 353 | { |
d771f832 DG |
354 | int ret, use_relayd = 0; |
355 | ssize_t ret_read; | |
07b86b52 JD |
356 | struct lttng_consumer_channel *metadata_channel; |
357 | struct lttng_consumer_stream *metadata_stream; | |
d771f832 DG |
358 | |
359 | assert(ctx); | |
07b86b52 JD |
360 | |
361 | DBG("Kernel consumer snapshot metadata with key %" PRIu64 " at path %s", | |
362 | key, path); | |
363 | ||
364 | rcu_read_lock(); | |
365 | ||
366 | metadata_channel = consumer_find_channel(key); | |
367 | if (!metadata_channel) { | |
d771f832 | 368 | ERR("Kernel snapshot metadata not found for key %" PRIu64, key); |
07b86b52 | 369 | ret = -1; |
d771f832 | 370 | goto error; |
07b86b52 JD |
371 | } |
372 | ||
373 | metadata_stream = metadata_channel->metadata_stream; | |
374 | assert(metadata_stream); | |
375 | ||
d771f832 | 376 | /* Flag once that we have a valid relayd for the stream. */ |
e2039c7a | 377 | if (relayd_id != (uint64_t) -1ULL) { |
d771f832 DG |
378 | use_relayd = 1; |
379 | } | |
380 | ||
381 | if (use_relayd) { | |
10a50311 | 382 | ret = consumer_send_relayd_stream(metadata_stream, path); |
e2039c7a | 383 | if (ret < 0) { |
d771f832 | 384 | goto error; |
e2039c7a | 385 | } |
e2039c7a JD |
386 | } else { |
387 | ret = utils_create_stream_file(path, metadata_stream->name, | |
388 | metadata_stream->chan->tracefile_size, | |
389 | metadata_stream->tracefile_count_current, | |
309167d2 | 390 | metadata_stream->uid, metadata_stream->gid, NULL); |
e2039c7a | 391 | if (ret < 0) { |
d771f832 | 392 | goto error; |
e2039c7a JD |
393 | } |
394 | metadata_stream->out_fd = ret; | |
07b86b52 | 395 | } |
07b86b52 | 396 | |
d771f832 | 397 | do { |
9ce5646a MD |
398 | health_code_update(); |
399 | ||
d771f832 DG |
400 | ret_read = lttng_kconsumer_read_subbuffer(metadata_stream, ctx); |
401 | if (ret_read < 0) { | |
56591bac | 402 | if (ret_read != -EAGAIN) { |
6a00837f | 403 | ERR("Kernel snapshot reading metadata subbuffer (ret: %zd)", |
d771f832 DG |
404 | ret_read); |
405 | goto error; | |
07b86b52 | 406 | } |
d771f832 | 407 | /* ret_read is negative at this point so we will exit the loop. */ |
07b86b52 JD |
408 | continue; |
409 | } | |
d771f832 | 410 | } while (ret_read >= 0); |
07b86b52 | 411 | |
d771f832 DG |
412 | if (use_relayd) { |
413 | close_relayd_stream(metadata_stream); | |
414 | metadata_stream->net_seq_idx = (uint64_t) -1ULL; | |
415 | } else { | |
fdf9986c MD |
416 | if (metadata_stream->out_fd >= 0) { |
417 | ret = close(metadata_stream->out_fd); | |
418 | if (ret < 0) { | |
419 | PERROR("Kernel consumer snapshot metadata close out_fd"); | |
420 | /* | |
421 | * Don't go on error here since the snapshot was successful at this | |
422 | * point but somehow the close failed. | |
423 | */ | |
424 | } | |
425 | metadata_stream->out_fd = -1; | |
e2039c7a | 426 | } |
e2039c7a JD |
427 | } |
428 | ||
07b86b52 | 429 | ret = 0; |
d771f832 | 430 | |
cf53a8a6 JD |
431 | cds_list_del(&metadata_stream->send_node); |
432 | consumer_stream_destroy(metadata_stream, NULL); | |
433 | metadata_channel->metadata_stream = NULL; | |
d771f832 | 434 | error: |
07b86b52 JD |
435 | rcu_read_unlock(); |
436 | return ret; | |
437 | } | |
438 | ||
1803a064 MD |
439 | /* |
440 | * Receive command from session daemon and process it. | |
441 | * | |
442 | * Return 1 on success else a negative value or 0. | |
443 | */ | |
3bd1e081 MD |
444 | int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
445 | int sock, struct pollfd *consumer_sockpoll) | |
446 | { | |
447 | ssize_t ret; | |
0c759fc9 | 448 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 MD |
449 | struct lttcomm_consumer_msg msg; |
450 | ||
9ce5646a MD |
451 | health_code_update(); |
452 | ||
3bd1e081 MD |
453 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
454 | if (ret != sizeof(msg)) { | |
1803a064 | 455 | if (ret > 0) { |
c6857fcf | 456 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
1803a064 MD |
457 | ret = -1; |
458 | } | |
3bd1e081 MD |
459 | return ret; |
460 | } | |
9ce5646a MD |
461 | |
462 | health_code_update(); | |
463 | ||
84382d49 MD |
464 | /* Deprecated command */ |
465 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 466 | |
9ce5646a MD |
467 | health_code_update(); |
468 | ||
b0b335c8 MD |
469 | /* relayd needs RCU read-side protection */ |
470 | rcu_read_lock(); | |
471 | ||
3bd1e081 | 472 | switch (msg.cmd_type) { |
00e2e675 DG |
473 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
474 | { | |
f50f23d9 | 475 | /* Session daemon status message are handled in the following call. */ |
7735ef9e DG |
476 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
477 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, | |
d3e2ba59 JD |
478 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
479 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
480 | goto end_nosignal; |
481 | } | |
3bd1e081 MD |
482 | case LTTNG_CONSUMER_ADD_CHANNEL: |
483 | { | |
484 | struct lttng_consumer_channel *new_channel; | |
e43c41c5 | 485 | int ret_recv; |
3bd1e081 | 486 | |
9ce5646a MD |
487 | health_code_update(); |
488 | ||
f50f23d9 DG |
489 | /* First send a status message before receiving the fds. */ |
490 | ret = consumer_send_status_msg(sock, ret_code); | |
491 | if (ret < 0) { | |
492 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 493 | goto error_fatal; |
f50f23d9 | 494 | } |
9ce5646a MD |
495 | |
496 | health_code_update(); | |
497 | ||
d88aee68 | 498 | DBG("consumer_add_channel %" PRIu64, msg.u.channel.channel_key); |
3bd1e081 | 499 | new_channel = consumer_allocate_channel(msg.u.channel.channel_key, |
ffe60014 DG |
500 | msg.u.channel.session_id, msg.u.channel.pathname, |
501 | msg.u.channel.name, msg.u.channel.uid, msg.u.channel.gid, | |
1624d5b7 JD |
502 | msg.u.channel.relayd_id, msg.u.channel.output, |
503 | msg.u.channel.tracefile_size, | |
1950109e | 504 | msg.u.channel.tracefile_count, 0, |
ecc48a90 | 505 | msg.u.channel.monitor, |
d7ba1388 | 506 | msg.u.channel.live_timer_interval, |
3d071855 | 507 | NULL, NULL); |
3bd1e081 | 508 | if (new_channel == NULL) { |
f73fabfd | 509 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
3bd1e081 MD |
510 | goto end_nosignal; |
511 | } | |
ffe60014 | 512 | new_channel->nb_init_stream_left = msg.u.channel.nb_init_streams; |
95a1109b JD |
513 | switch (msg.u.channel.output) { |
514 | case LTTNG_EVENT_SPLICE: | |
515 | new_channel->output = CONSUMER_CHANNEL_SPLICE; | |
516 | break; | |
517 | case LTTNG_EVENT_MMAP: | |
518 | new_channel->output = CONSUMER_CHANNEL_MMAP; | |
519 | break; | |
520 | default: | |
521 | ERR("Channel output unknown %d", msg.u.channel.output); | |
522 | goto end_nosignal; | |
523 | } | |
ffe60014 DG |
524 | |
525 | /* Translate and save channel type. */ | |
526 | switch (msg.u.channel.type) { | |
527 | case CONSUMER_CHANNEL_TYPE_DATA: | |
528 | case CONSUMER_CHANNEL_TYPE_METADATA: | |
529 | new_channel->type = msg.u.channel.type; | |
530 | break; | |
531 | default: | |
532 | assert(0); | |
533 | goto end_nosignal; | |
534 | }; | |
535 | ||
9ce5646a MD |
536 | health_code_update(); |
537 | ||
3bd1e081 | 538 | if (ctx->on_recv_channel != NULL) { |
e43c41c5 JD |
539 | ret_recv = ctx->on_recv_channel(new_channel); |
540 | if (ret_recv == 0) { | |
541 | ret = consumer_add_channel(new_channel, ctx); | |
542 | } else if (ret_recv < 0) { | |
3bd1e081 MD |
543 | goto end_nosignal; |
544 | } | |
545 | } else { | |
e43c41c5 | 546 | ret = consumer_add_channel(new_channel, ctx); |
3bd1e081 | 547 | } |
94d49140 JD |
548 | if (CONSUMER_CHANNEL_TYPE_DATA) { |
549 | consumer_timer_live_start(new_channel, | |
550 | msg.u.channel.live_timer_interval); | |
551 | } | |
e43c41c5 | 552 | |
9ce5646a MD |
553 | health_code_update(); |
554 | ||
e43c41c5 | 555 | /* If we received an error in add_channel, we need to report it. */ |
821fffb2 | 556 | if (ret < 0) { |
1803a064 MD |
557 | ret = consumer_send_status_msg(sock, ret); |
558 | if (ret < 0) { | |
559 | goto error_fatal; | |
560 | } | |
e43c41c5 JD |
561 | goto end_nosignal; |
562 | } | |
563 | ||
3bd1e081 MD |
564 | goto end_nosignal; |
565 | } | |
566 | case LTTNG_CONSUMER_ADD_STREAM: | |
567 | { | |
dae10966 DG |
568 | int fd; |
569 | struct lttng_pipe *stream_pipe; | |
00e2e675 | 570 | struct lttng_consumer_stream *new_stream; |
ffe60014 | 571 | struct lttng_consumer_channel *channel; |
c80048c6 | 572 | int alloc_ret = 0; |
3bd1e081 | 573 | |
ffe60014 DG |
574 | /* |
575 | * Get stream's channel reference. Needed when adding the stream to the | |
576 | * global hash table. | |
577 | */ | |
578 | channel = consumer_find_channel(msg.u.stream.channel_key); | |
579 | if (!channel) { | |
580 | /* | |
581 | * We could not find the channel. Can happen if cpu hotplug | |
582 | * happens while tearing down. | |
583 | */ | |
d88aee68 | 584 | ERR("Unable to find channel key %" PRIu64, msg.u.stream.channel_key); |
e462382a | 585 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
ffe60014 DG |
586 | } |
587 | ||
9ce5646a MD |
588 | health_code_update(); |
589 | ||
f50f23d9 DG |
590 | /* First send a status message before receiving the fds. */ |
591 | ret = consumer_send_status_msg(sock, ret_code); | |
1803a064 | 592 | if (ret < 0) { |
d771f832 | 593 | /* Somehow, the session daemon is not responding anymore. */ |
1803a064 MD |
594 | goto error_fatal; |
595 | } | |
9ce5646a MD |
596 | |
597 | health_code_update(); | |
598 | ||
0c759fc9 | 599 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
d771f832 | 600 | /* Channel was not found. */ |
f50f23d9 DG |
601 | goto end_nosignal; |
602 | } | |
603 | ||
d771f832 | 604 | /* Blocking call */ |
9ce5646a MD |
605 | health_poll_entry(); |
606 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
607 | health_poll_exit(); | |
84382d49 MD |
608 | if (ret) { |
609 | goto error_fatal; | |
3bd1e081 | 610 | } |
00e2e675 | 611 | |
9ce5646a MD |
612 | health_code_update(); |
613 | ||
00e2e675 | 614 | /* Get stream file descriptor from socket */ |
f2fc6720 MD |
615 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); |
616 | if (ret != sizeof(fd)) { | |
f73fabfd | 617 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
3f8e211f | 618 | rcu_read_unlock(); |
3bd1e081 MD |
619 | return ret; |
620 | } | |
3bd1e081 | 621 | |
9ce5646a MD |
622 | health_code_update(); |
623 | ||
f50f23d9 DG |
624 | /* |
625 | * Send status code to session daemon only if the recv works. If the | |
626 | * above recv() failed, the session daemon is notified through the | |
627 | * error socket and the teardown is eventually done. | |
628 | */ | |
629 | ret = consumer_send_status_msg(sock, ret_code); | |
630 | if (ret < 0) { | |
631 | /* Somehow, the session daemon is not responding anymore. */ | |
632 | goto end_nosignal; | |
633 | } | |
634 | ||
9ce5646a MD |
635 | health_code_update(); |
636 | ||
ffe60014 DG |
637 | new_stream = consumer_allocate_stream(channel->key, |
638 | fd, | |
639 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
640 | channel->name, | |
641 | channel->uid, | |
642 | channel->gid, | |
643 | channel->relayd_id, | |
644 | channel->session_id, | |
645 | msg.u.stream.cpu, | |
646 | &alloc_ret, | |
4891ece8 DG |
647 | channel->type, |
648 | channel->monitor); | |
3bd1e081 | 649 | if (new_stream == NULL) { |
c80048c6 MD |
650 | switch (alloc_ret) { |
651 | case -ENOMEM: | |
652 | case -EINVAL: | |
653 | default: | |
654 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
655 | break; | |
c80048c6 | 656 | } |
3f8e211f | 657 | goto end_nosignal; |
3bd1e081 | 658 | } |
d771f832 | 659 | |
ffe60014 DG |
660 | new_stream->chan = channel; |
661 | new_stream->wait_fd = fd; | |
07b86b52 JD |
662 | switch (channel->output) { |
663 | case CONSUMER_CHANNEL_SPLICE: | |
664 | new_stream->output = LTTNG_EVENT_SPLICE; | |
a2361a61 JD |
665 | ret = utils_create_pipe(new_stream->splice_pipe); |
666 | if (ret < 0) { | |
667 | goto end_nosignal; | |
668 | } | |
07b86b52 JD |
669 | break; |
670 | case CONSUMER_CHANNEL_MMAP: | |
671 | new_stream->output = LTTNG_EVENT_MMAP; | |
672 | break; | |
673 | default: | |
674 | ERR("Stream output unknown %d", channel->output); | |
675 | goto end_nosignal; | |
676 | } | |
00e2e675 | 677 | |
a0c83db9 DG |
678 | /* |
679 | * We've just assigned the channel to the stream so increment the | |
07b86b52 JD |
680 | * refcount right now. We don't need to increment the refcount for |
681 | * streams in no monitor because we handle manually the cleanup of | |
682 | * those. It is very important to make sure there is NO prior | |
683 | * consumer_del_stream() calls or else the refcount will be unbalanced. | |
a0c83db9 | 684 | */ |
07b86b52 JD |
685 | if (channel->monitor) { |
686 | uatomic_inc(&new_stream->chan->refcount); | |
687 | } | |
9d9353f9 | 688 | |
fb3a43a9 DG |
689 | /* |
690 | * The buffer flush is done on the session daemon side for the kernel | |
691 | * so no need for the stream "hangup_flush_done" variable to be | |
692 | * tracked. This is important for a kernel stream since we don't rely | |
693 | * on the flush state of the stream to read data. It's not the case for | |
694 | * user space tracing. | |
695 | */ | |
696 | new_stream->hangup_flush_done = 0; | |
697 | ||
9ce5646a MD |
698 | health_code_update(); |
699 | ||
633d0084 DG |
700 | if (ctx->on_recv_stream) { |
701 | ret = ctx->on_recv_stream(new_stream); | |
702 | if (ret < 0) { | |
d771f832 | 703 | consumer_stream_free(new_stream); |
633d0084 | 704 | goto end_nosignal; |
fb3a43a9 | 705 | } |
633d0084 | 706 | } |
fb3a43a9 | 707 | |
9ce5646a MD |
708 | health_code_update(); |
709 | ||
07b86b52 JD |
710 | if (new_stream->metadata_flag) { |
711 | channel->metadata_stream = new_stream; | |
712 | } | |
713 | ||
2bba9e53 DG |
714 | /* Do not monitor this stream. */ |
715 | if (!channel->monitor) { | |
5eecee74 | 716 | DBG("Kernel consumer add stream %s in no monitor mode with " |
6dc3064a | 717 | "relayd id %" PRIu64, new_stream->name, |
5eecee74 | 718 | new_stream->net_seq_idx); |
10a50311 | 719 | cds_list_add(&new_stream->send_node, &channel->streams.head); |
6dc3064a DG |
720 | break; |
721 | } | |
722 | ||
e1b71bdc DG |
723 | /* Send stream to relayd if the stream has an ID. */ |
724 | if (new_stream->net_seq_idx != (uint64_t) -1ULL) { | |
194ee077 DG |
725 | ret = consumer_send_relayd_stream(new_stream, |
726 | new_stream->chan->pathname); | |
e1b71bdc DG |
727 | if (ret < 0) { |
728 | consumer_stream_free(new_stream); | |
729 | goto end_nosignal; | |
730 | } | |
b7fa98e6 MD |
731 | |
732 | /* | |
733 | * If adding an extra stream to an already | |
734 | * existing channel (e.g. cpu hotplug), we need | |
735 | * to send the "streams_sent" command to relayd. | |
736 | */ | |
737 | if (channel->streams_sent_to_relayd) { | |
738 | ret = consumer_send_relayd_streams_sent( | |
739 | new_stream->net_seq_idx); | |
740 | if (ret < 0) { | |
741 | goto end_nosignal; | |
742 | } | |
743 | } | |
e2039c7a JD |
744 | } |
745 | ||
50f8ae69 | 746 | /* Get the right pipe where the stream will be sent. */ |
633d0084 | 747 | if (new_stream->metadata_flag) { |
5ab66908 MD |
748 | ret = consumer_add_metadata_stream(new_stream); |
749 | if (ret) { | |
750 | ERR("Consumer add metadata stream %" PRIu64 " failed. Continuing", | |
751 | new_stream->key); | |
752 | consumer_stream_free(new_stream); | |
753 | goto end_nosignal; | |
754 | } | |
dae10966 | 755 | stream_pipe = ctx->consumer_metadata_pipe; |
3bd1e081 | 756 | } else { |
5ab66908 MD |
757 | ret = consumer_add_data_stream(new_stream); |
758 | if (ret) { | |
759 | ERR("Consumer add stream %" PRIu64 " failed. Continuing", | |
760 | new_stream->key); | |
761 | consumer_stream_free(new_stream); | |
762 | goto end_nosignal; | |
763 | } | |
dae10966 | 764 | stream_pipe = ctx->consumer_data_pipe; |
50f8ae69 DG |
765 | } |
766 | ||
5ab66908 MD |
767 | /* Vitible to other threads */ |
768 | new_stream->globally_visible = 1; | |
769 | ||
9ce5646a MD |
770 | health_code_update(); |
771 | ||
dae10966 | 772 | ret = lttng_pipe_write(stream_pipe, &new_stream, sizeof(new_stream)); |
50f8ae69 | 773 | if (ret < 0) { |
dae10966 | 774 | ERR("Consumer write %s stream to pipe %d", |
50f8ae69 | 775 | new_stream->metadata_flag ? "metadata" : "data", |
dae10966 | 776 | lttng_pipe_get_writefd(stream_pipe)); |
5ab66908 MD |
777 | if (new_stream->metadata_flag) { |
778 | consumer_del_stream_for_metadata(new_stream); | |
779 | } else { | |
780 | consumer_del_stream_for_data(new_stream); | |
781 | } | |
50f8ae69 | 782 | goto end_nosignal; |
3bd1e081 | 783 | } |
00e2e675 | 784 | |
50f8ae69 | 785 | DBG("Kernel consumer ADD_STREAM %s (fd: %d) with relayd id %" PRIu64, |
ffe60014 | 786 | new_stream->name, fd, new_stream->relayd_stream_id); |
3bd1e081 MD |
787 | break; |
788 | } | |
a4baae1b JD |
789 | case LTTNG_CONSUMER_STREAMS_SENT: |
790 | { | |
791 | struct lttng_consumer_channel *channel; | |
792 | ||
793 | /* | |
794 | * Get stream's channel reference. Needed when adding the stream to the | |
795 | * global hash table. | |
796 | */ | |
797 | channel = consumer_find_channel(msg.u.sent_streams.channel_key); | |
798 | if (!channel) { | |
799 | /* | |
800 | * We could not find the channel. Can happen if cpu hotplug | |
801 | * happens while tearing down. | |
802 | */ | |
803 | ERR("Unable to find channel key %" PRIu64, | |
804 | msg.u.sent_streams.channel_key); | |
e462382a | 805 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
a4baae1b JD |
806 | } |
807 | ||
808 | health_code_update(); | |
809 | ||
810 | /* | |
811 | * Send status code to session daemon. | |
812 | */ | |
813 | ret = consumer_send_status_msg(sock, ret_code); | |
f261ad0a | 814 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
a4baae1b JD |
815 | /* Somehow, the session daemon is not responding anymore. */ |
816 | goto end_nosignal; | |
817 | } | |
818 | ||
819 | health_code_update(); | |
820 | ||
821 | /* | |
822 | * We should not send this message if we don't monitor the | |
823 | * streams in this channel. | |
824 | */ | |
825 | if (!channel->monitor) { | |
826 | break; | |
827 | } | |
828 | ||
829 | health_code_update(); | |
830 | /* Send stream to relayd if the stream has an ID. */ | |
831 | if (msg.u.sent_streams.net_seq_idx != (uint64_t) -1ULL) { | |
832 | ret = consumer_send_relayd_streams_sent( | |
833 | msg.u.sent_streams.net_seq_idx); | |
834 | if (ret < 0) { | |
835 | goto end_nosignal; | |
836 | } | |
b7fa98e6 | 837 | channel->streams_sent_to_relayd = true; |
a4baae1b JD |
838 | } |
839 | break; | |
840 | } | |
3bd1e081 MD |
841 | case LTTNG_CONSUMER_UPDATE_STREAM: |
842 | { | |
3f8e211f DG |
843 | rcu_read_unlock(); |
844 | return -ENOSYS; | |
845 | } | |
846 | case LTTNG_CONSUMER_DESTROY_RELAYD: | |
847 | { | |
a6ba4fe1 | 848 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
3f8e211f DG |
849 | struct consumer_relayd_sock_pair *relayd; |
850 | ||
a6ba4fe1 | 851 | DBG("Kernel consumer destroying relayd %" PRIu64, index); |
3f8e211f DG |
852 | |
853 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 854 | relayd = consumer_find_relayd(index); |
3f8e211f | 855 | if (relayd == NULL) { |
3448e266 | 856 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 857 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
3bd1e081 | 858 | } |
3f8e211f | 859 | |
a6ba4fe1 DG |
860 | /* |
861 | * Each relayd socket pair has a refcount of stream attached to it | |
862 | * which tells if the relayd is still active or not depending on the | |
863 | * refcount value. | |
864 | * | |
865 | * This will set the destroy flag of the relayd object and destroy it | |
866 | * if the refcount reaches zero when called. | |
867 | * | |
868 | * The destroy can happen either here or when a stream fd hangs up. | |
869 | */ | |
f50f23d9 DG |
870 | if (relayd) { |
871 | consumer_flag_relayd_for_destroy(relayd); | |
872 | } | |
873 | ||
9ce5646a MD |
874 | health_code_update(); |
875 | ||
f50f23d9 DG |
876 | ret = consumer_send_status_msg(sock, ret_code); |
877 | if (ret < 0) { | |
878 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 879 | goto error_fatal; |
f50f23d9 | 880 | } |
3f8e211f | 881 | |
3f8e211f | 882 | goto end_nosignal; |
3bd1e081 | 883 | } |
6d805429 | 884 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 885 | { |
c8f59ee5 | 886 | int32_t ret; |
6d805429 | 887 | uint64_t id = msg.u.data_pending.session_id; |
c8f59ee5 | 888 | |
6d805429 | 889 | DBG("Kernel consumer data pending command for id %" PRIu64, id); |
c8f59ee5 | 890 | |
6d805429 | 891 | ret = consumer_data_pending(id); |
c8f59ee5 | 892 | |
9ce5646a MD |
893 | health_code_update(); |
894 | ||
c8f59ee5 DG |
895 | /* Send back returned value to session daemon */ |
896 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
897 | if (ret < 0) { | |
6d805429 | 898 | PERROR("send data pending ret code"); |
1803a064 | 899 | goto error_fatal; |
c8f59ee5 | 900 | } |
f50f23d9 DG |
901 | |
902 | /* | |
903 | * No need to send back a status message since the data pending | |
904 | * returned value is the response. | |
905 | */ | |
c8f59ee5 | 906 | break; |
53632229 | 907 | } |
6dc3064a DG |
908 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
909 | { | |
07b86b52 JD |
910 | if (msg.u.snapshot_channel.metadata == 1) { |
911 | ret = lttng_kconsumer_snapshot_metadata(msg.u.snapshot_channel.key, | |
e2039c7a JD |
912 | msg.u.snapshot_channel.pathname, |
913 | msg.u.snapshot_channel.relayd_id, ctx); | |
07b86b52 JD |
914 | if (ret < 0) { |
915 | ERR("Snapshot metadata failed"); | |
e462382a | 916 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; |
07b86b52 JD |
917 | } |
918 | } else { | |
919 | ret = lttng_kconsumer_snapshot_channel(msg.u.snapshot_channel.key, | |
920 | msg.u.snapshot_channel.pathname, | |
5c786ded | 921 | msg.u.snapshot_channel.relayd_id, |
d07ceecd | 922 | msg.u.snapshot_channel.nb_packets_per_stream, |
5c786ded | 923 | ctx); |
07b86b52 JD |
924 | if (ret < 0) { |
925 | ERR("Snapshot channel failed"); | |
e462382a | 926 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
07b86b52 JD |
927 | } |
928 | } | |
929 | ||
9ce5646a MD |
930 | health_code_update(); |
931 | ||
6dc3064a DG |
932 | ret = consumer_send_status_msg(sock, ret_code); |
933 | if (ret < 0) { | |
934 | /* Somehow, the session daemon is not responding anymore. */ | |
935 | goto end_nosignal; | |
936 | } | |
937 | break; | |
938 | } | |
07b86b52 JD |
939 | case LTTNG_CONSUMER_DESTROY_CHANNEL: |
940 | { | |
941 | uint64_t key = msg.u.destroy_channel.key; | |
942 | struct lttng_consumer_channel *channel; | |
943 | ||
944 | channel = consumer_find_channel(key); | |
945 | if (!channel) { | |
946 | ERR("Kernel consumer destroy channel %" PRIu64 " not found", key); | |
e462382a | 947 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
07b86b52 JD |
948 | } |
949 | ||
9ce5646a MD |
950 | health_code_update(); |
951 | ||
07b86b52 JD |
952 | ret = consumer_send_status_msg(sock, ret_code); |
953 | if (ret < 0) { | |
954 | /* Somehow, the session daemon is not responding anymore. */ | |
955 | goto end_nosignal; | |
956 | } | |
957 | ||
9ce5646a MD |
958 | health_code_update(); |
959 | ||
15dc512a DG |
960 | /* Stop right now if no channel was found. */ |
961 | if (!channel) { | |
962 | goto end_nosignal; | |
963 | } | |
964 | ||
07b86b52 JD |
965 | /* |
966 | * This command should ONLY be issued for channel with streams set in | |
967 | * no monitor mode. | |
968 | */ | |
969 | assert(!channel->monitor); | |
970 | ||
971 | /* | |
972 | * The refcount should ALWAYS be 0 in the case of a channel in no | |
973 | * monitor mode. | |
974 | */ | |
975 | assert(!uatomic_sub_return(&channel->refcount, 1)); | |
976 | ||
977 | consumer_del_channel(channel); | |
978 | ||
979 | goto end_nosignal; | |
980 | } | |
fb83fe64 JD |
981 | case LTTNG_CONSUMER_DISCARDED_EVENTS: |
982 | { | |
983 | uint64_t ret; | |
984 | struct lttng_consumer_channel *channel; | |
985 | uint64_t id = msg.u.discarded_events.session_id; | |
986 | uint64_t key = msg.u.discarded_events.channel_key; | |
987 | ||
e5742757 MD |
988 | DBG("Kernel consumer discarded events command for session id %" |
989 | PRIu64 ", channel key %" PRIu64, id, key); | |
990 | ||
fb83fe64 JD |
991 | channel = consumer_find_channel(key); |
992 | if (!channel) { | |
993 | ERR("Kernel consumer discarded events channel %" | |
994 | PRIu64 " not found", key); | |
e5742757 MD |
995 | ret = 0; |
996 | } else { | |
997 | ret = channel->discarded_events; | |
fb83fe64 JD |
998 | } |
999 | ||
fb83fe64 JD |
1000 | health_code_update(); |
1001 | ||
1002 | /* Send back returned value to session daemon */ | |
1003 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
1004 | if (ret < 0) { | |
1005 | PERROR("send discarded events"); | |
1006 | goto error_fatal; | |
1007 | } | |
1008 | ||
1009 | break; | |
1010 | } | |
1011 | case LTTNG_CONSUMER_LOST_PACKETS: | |
1012 | { | |
1013 | uint64_t ret; | |
1014 | struct lttng_consumer_channel *channel; | |
1015 | uint64_t id = msg.u.lost_packets.session_id; | |
1016 | uint64_t key = msg.u.lost_packets.channel_key; | |
1017 | ||
e5742757 MD |
1018 | DBG("Kernel consumer lost packets command for session id %" |
1019 | PRIu64 ", channel key %" PRIu64, id, key); | |
1020 | ||
fb83fe64 JD |
1021 | channel = consumer_find_channel(key); |
1022 | if (!channel) { | |
1023 | ERR("Kernel consumer lost packets channel %" | |
1024 | PRIu64 " not found", key); | |
e5742757 MD |
1025 | ret = 0; |
1026 | } else { | |
1027 | ret = channel->lost_packets; | |
fb83fe64 JD |
1028 | } |
1029 | ||
fb83fe64 JD |
1030 | health_code_update(); |
1031 | ||
1032 | /* Send back returned value to session daemon */ | |
1033 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
1034 | if (ret < 0) { | |
1035 | PERROR("send lost packets"); | |
1036 | goto error_fatal; | |
1037 | } | |
1038 | ||
1039 | break; | |
1040 | } | |
3bd1e081 | 1041 | default: |
3f8e211f | 1042 | goto end_nosignal; |
3bd1e081 | 1043 | } |
3f8e211f | 1044 | |
3bd1e081 | 1045 | end_nosignal: |
b0b335c8 | 1046 | rcu_read_unlock(); |
4cbc1a04 DG |
1047 | |
1048 | /* | |
1049 | * Return 1 to indicate success since the 0 value can be a socket | |
1050 | * shutdown during the recv() or send() call. | |
1051 | */ | |
9ce5646a | 1052 | health_code_update(); |
4cbc1a04 | 1053 | return 1; |
1803a064 MD |
1054 | |
1055 | error_fatal: | |
1056 | rcu_read_unlock(); | |
1057 | /* This will issue a consumer stop. */ | |
1058 | return -1; | |
3bd1e081 | 1059 | } |
d41f73b7 | 1060 | |
309167d2 JD |
1061 | /* |
1062 | * Populate index values of a kernel stream. Values are set in big endian order. | |
1063 | * | |
1064 | * Return 0 on success or else a negative value. | |
1065 | */ | |
50adc264 | 1066 | static int get_index_values(struct ctf_packet_index *index, int infd) |
309167d2 JD |
1067 | { |
1068 | int ret; | |
1069 | ||
1070 | ret = kernctl_get_timestamp_begin(infd, &index->timestamp_begin); | |
1071 | if (ret < 0) { | |
1072 | PERROR("kernctl_get_timestamp_begin"); | |
1073 | goto error; | |
1074 | } | |
1075 | index->timestamp_begin = htobe64(index->timestamp_begin); | |
1076 | ||
1077 | ret = kernctl_get_timestamp_end(infd, &index->timestamp_end); | |
1078 | if (ret < 0) { | |
1079 | PERROR("kernctl_get_timestamp_end"); | |
1080 | goto error; | |
1081 | } | |
1082 | index->timestamp_end = htobe64(index->timestamp_end); | |
1083 | ||
1084 | ret = kernctl_get_events_discarded(infd, &index->events_discarded); | |
1085 | if (ret < 0) { | |
1086 | PERROR("kernctl_get_events_discarded"); | |
1087 | goto error; | |
1088 | } | |
1089 | index->events_discarded = htobe64(index->events_discarded); | |
1090 | ||
1091 | ret = kernctl_get_content_size(infd, &index->content_size); | |
1092 | if (ret < 0) { | |
1093 | PERROR("kernctl_get_content_size"); | |
1094 | goto error; | |
1095 | } | |
1096 | index->content_size = htobe64(index->content_size); | |
1097 | ||
1098 | ret = kernctl_get_packet_size(infd, &index->packet_size); | |
1099 | if (ret < 0) { | |
1100 | PERROR("kernctl_get_packet_size"); | |
1101 | goto error; | |
1102 | } | |
1103 | index->packet_size = htobe64(index->packet_size); | |
1104 | ||
1105 | ret = kernctl_get_stream_id(infd, &index->stream_id); | |
1106 | if (ret < 0) { | |
1107 | PERROR("kernctl_get_stream_id"); | |
1108 | goto error; | |
1109 | } | |
1110 | index->stream_id = htobe64(index->stream_id); | |
1111 | ||
234cd636 JD |
1112 | ret = kernctl_get_instance_id(infd, &index->stream_instance_id); |
1113 | if (ret < 0) { | |
f0b03c22 MD |
1114 | if (ret == -ENOTTY) { |
1115 | /* Command not implemented by lttng-modules. */ | |
1116 | index->stream_instance_id = -1ULL; | |
1117 | ret = 0; | |
1118 | } else { | |
1119 | PERROR("kernctl_get_instance_id"); | |
1120 | goto error; | |
1121 | } | |
234cd636 JD |
1122 | } |
1123 | index->stream_instance_id = htobe64(index->stream_instance_id); | |
1124 | ||
1125 | ret = kernctl_get_sequence_number(infd, &index->packet_seq_num); | |
1126 | if (ret < 0) { | |
f0b03c22 MD |
1127 | if (ret == -ENOTTY) { |
1128 | /* Command not implemented by lttng-modules. */ | |
1129 | index->packet_seq_num = -1ULL; | |
1130 | ret = 0; | |
1131 | } else { | |
1132 | PERROR("kernctl_get_sequence_number"); | |
1133 | goto error; | |
1134 | } | |
234cd636 JD |
1135 | } |
1136 | index->packet_seq_num = htobe64(index->packet_seq_num); | |
1137 | ||
309167d2 JD |
1138 | error: |
1139 | return ret; | |
1140 | } | |
94d49140 JD |
1141 | /* |
1142 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
1143 | * metadata thread can consumer them. | |
1144 | * | |
1145 | * Metadata stream lock MUST be acquired. | |
1146 | * | |
1147 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream | |
1148 | * is empty or a negative value on error. | |
1149 | */ | |
1150 | int lttng_kconsumer_sync_metadata(struct lttng_consumer_stream *metadata) | |
1151 | { | |
1152 | int ret; | |
1153 | ||
1154 | assert(metadata); | |
1155 | ||
1156 | ret = kernctl_buffer_flush(metadata->wait_fd); | |
1157 | if (ret < 0) { | |
1158 | ERR("Failed to flush kernel stream"); | |
1159 | goto end; | |
1160 | } | |
1161 | ||
1162 | ret = kernctl_snapshot(metadata->wait_fd); | |
1163 | if (ret < 0) { | |
32af2c95 | 1164 | if (ret != -EAGAIN) { |
94d49140 JD |
1165 | ERR("Sync metadata, taking kernel snapshot failed."); |
1166 | goto end; | |
1167 | } | |
1168 | DBG("Sync metadata, no new kernel metadata"); | |
1169 | /* No new metadata, exit. */ | |
1170 | ret = ENODATA; | |
1171 | goto end; | |
1172 | } | |
1173 | ||
1174 | end: | |
1175 | return ret; | |
1176 | } | |
309167d2 | 1177 | |
fb83fe64 JD |
1178 | static |
1179 | int update_stream_stats(struct lttng_consumer_stream *stream) | |
1180 | { | |
1181 | int ret; | |
1182 | uint64_t seq, discarded; | |
1183 | ||
1184 | ret = kernctl_get_sequence_number(stream->wait_fd, &seq); | |
1185 | if (ret < 0) { | |
f0b03c22 MD |
1186 | if (ret == -ENOTTY) { |
1187 | /* Command not implemented by lttng-modules. */ | |
1188 | seq = -1ULL; | |
1189 | ret = 0; | |
1190 | } else { | |
1191 | PERROR("kernctl_get_sequence_number"); | |
1192 | goto end; | |
1193 | } | |
fb83fe64 JD |
1194 | } |
1195 | ||
1196 | /* | |
1197 | * Start the sequence when we extract the first packet in case we don't | |
1198 | * start at 0 (for example if a consumer is not connected to the | |
1199 | * session immediately after the beginning). | |
1200 | */ | |
1201 | if (stream->last_sequence_number == -1ULL) { | |
1202 | stream->last_sequence_number = seq; | |
1203 | } else if (seq > stream->last_sequence_number) { | |
1204 | stream->chan->lost_packets += seq - | |
1205 | stream->last_sequence_number - 1; | |
1206 | } else { | |
1207 | /* seq <= last_sequence_number */ | |
1208 | ERR("Sequence number inconsistent : prev = %" PRIu64 | |
1209 | ", current = %" PRIu64, | |
1210 | stream->last_sequence_number, seq); | |
1211 | ret = -1; | |
1212 | goto end; | |
1213 | } | |
1214 | stream->last_sequence_number = seq; | |
1215 | ||
1216 | ret = kernctl_get_events_discarded(stream->wait_fd, &discarded); | |
1217 | if (ret < 0) { | |
1218 | PERROR("kernctl_get_events_discarded"); | |
1219 | goto end; | |
1220 | } | |
1221 | if (discarded < stream->last_discarded_events) { | |
1222 | /* | |
83f4233d MJ |
1223 | * Overflow has occurred. We assume only one wrap-around |
1224 | * has occurred. | |
fb83fe64 JD |
1225 | */ |
1226 | stream->chan->discarded_events += (1ULL << (CAA_BITS_PER_LONG - 1)) - | |
1227 | stream->last_discarded_events + discarded; | |
1228 | } else { | |
1229 | stream->chan->discarded_events += discarded - | |
1230 | stream->last_discarded_events; | |
1231 | } | |
1232 | stream->last_discarded_events = discarded; | |
1233 | ret = 0; | |
1234 | ||
1235 | end: | |
1236 | return ret; | |
1237 | } | |
1238 | ||
93ec662e JD |
1239 | /* |
1240 | * Check if the local version of the metadata stream matches with the version | |
1241 | * of the metadata stream in the kernel. If it was updated, set the reset flag | |
1242 | * on the stream. | |
1243 | */ | |
1244 | static | |
1245 | int metadata_stream_check_version(int infd, struct lttng_consumer_stream *stream) | |
1246 | { | |
1247 | int ret; | |
1248 | uint64_t cur_version; | |
1249 | ||
1250 | ret = kernctl_get_metadata_version(infd, &cur_version); | |
1251 | if (ret < 0) { | |
f0b03c22 MD |
1252 | if (ret == -ENOTTY) { |
1253 | /* | |
1254 | * LTTng-modules does not implement this | |
1255 | * command. | |
1256 | */ | |
1257 | ret = 0; | |
1258 | goto end; | |
1259 | } | |
93ec662e JD |
1260 | ERR("Failed to get the metadata version"); |
1261 | goto end; | |
1262 | } | |
1263 | ||
1264 | if (stream->metadata_version == cur_version) { | |
1265 | ret = 0; | |
1266 | goto end; | |
1267 | } | |
1268 | ||
1269 | DBG("New metadata version detected"); | |
1270 | stream->metadata_version = cur_version; | |
1271 | stream->reset_metadata_flag = 1; | |
1272 | ret = 0; | |
1273 | ||
1274 | end: | |
1275 | return ret; | |
1276 | } | |
1277 | ||
d41f73b7 MD |
1278 | /* |
1279 | * Consume data on a file descriptor and write it on a trace file. | |
1280 | */ | |
4078b776 | 1281 | ssize_t lttng_kconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
1282 | struct lttng_consumer_local_data *ctx) |
1283 | { | |
1d4dfdef | 1284 | unsigned long len, subbuf_size, padding; |
1c20f0e2 | 1285 | int err, write_index = 1; |
4078b776 | 1286 | ssize_t ret = 0; |
d41f73b7 | 1287 | int infd = stream->wait_fd; |
50adc264 | 1288 | struct ctf_packet_index index; |
d41f73b7 MD |
1289 | |
1290 | DBG("In read_subbuffer (infd : %d)", infd); | |
309167d2 | 1291 | |
d41f73b7 MD |
1292 | /* Get the next subbuffer */ |
1293 | err = kernctl_get_next_subbuf(infd); | |
1294 | if (err != 0) { | |
d41f73b7 MD |
1295 | /* |
1296 | * This is a debug message even for single-threaded consumer, | |
1297 | * because poll() have more relaxed criterions than get subbuf, | |
1298 | * so get_subbuf may fail for short race windows where poll() | |
1299 | * would issue wakeups. | |
1300 | */ | |
1301 | DBG("Reserving sub buffer failed (everything is normal, " | |
1302 | "it is due to concurrency)"); | |
32af2c95 | 1303 | ret = err; |
d41f73b7 MD |
1304 | goto end; |
1305 | } | |
1306 | ||
1d4dfdef DG |
1307 | /* Get the full subbuffer size including padding */ |
1308 | err = kernctl_get_padded_subbuf_size(infd, &len); | |
1309 | if (err != 0) { | |
5a510c9f | 1310 | PERROR("Getting sub-buffer len failed."); |
8265f19e MD |
1311 | err = kernctl_put_subbuf(infd); |
1312 | if (err != 0) { | |
32af2c95 | 1313 | if (err == -EFAULT) { |
5a510c9f | 1314 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1315 | } else if (err == -EIO) { |
8265f19e | 1316 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1317 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e | 1318 | } |
32af2c95 | 1319 | ret = err; |
8265f19e MD |
1320 | goto end; |
1321 | } | |
32af2c95 | 1322 | ret = err; |
1d4dfdef DG |
1323 | goto end; |
1324 | } | |
1325 | ||
1c20f0e2 | 1326 | if (!stream->metadata_flag) { |
309167d2 JD |
1327 | ret = get_index_values(&index, infd); |
1328 | if (ret < 0) { | |
8265f19e MD |
1329 | err = kernctl_put_subbuf(infd); |
1330 | if (err != 0) { | |
32af2c95 | 1331 | if (err == -EFAULT) { |
5a510c9f | 1332 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1333 | } else if (err == -EIO) { |
8265f19e | 1334 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1335 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e | 1336 | } |
32af2c95 | 1337 | ret = err; |
8265f19e MD |
1338 | goto end; |
1339 | } | |
309167d2 JD |
1340 | goto end; |
1341 | } | |
fb83fe64 JD |
1342 | ret = update_stream_stats(stream); |
1343 | if (ret < 0) { | |
becac7c4 MD |
1344 | err = kernctl_put_subbuf(infd); |
1345 | if (err != 0) { | |
1346 | if (err == -EFAULT) { | |
1347 | PERROR("Error in unreserving sub buffer\n"); | |
1348 | } else if (err == -EIO) { | |
1349 | /* Should never happen with newer LTTng versions */ | |
1350 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
1351 | } | |
1352 | ret = err; | |
1353 | goto end; | |
1354 | } | |
fb83fe64 JD |
1355 | goto end; |
1356 | } | |
1c20f0e2 JD |
1357 | } else { |
1358 | write_index = 0; | |
93ec662e JD |
1359 | ret = metadata_stream_check_version(infd, stream); |
1360 | if (ret < 0) { | |
becac7c4 MD |
1361 | err = kernctl_put_subbuf(infd); |
1362 | if (err != 0) { | |
1363 | if (err == -EFAULT) { | |
1364 | PERROR("Error in unreserving sub buffer\n"); | |
1365 | } else if (err == -EIO) { | |
1366 | /* Should never happen with newer LTTng versions */ | |
1367 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
1368 | } | |
1369 | ret = err; | |
1370 | goto end; | |
1371 | } | |
93ec662e JD |
1372 | goto end; |
1373 | } | |
309167d2 JD |
1374 | } |
1375 | ||
ffe60014 | 1376 | switch (stream->chan->output) { |
07b86b52 | 1377 | case CONSUMER_CHANNEL_SPLICE: |
1d4dfdef DG |
1378 | /* |
1379 | * XXX: The lttng-modules splice "actor" does not handle copying | |
1380 | * partial pages hence only using the subbuffer size without the | |
1381 | * padding makes the splice fail. | |
1382 | */ | |
1383 | subbuf_size = len; | |
1384 | padding = 0; | |
1385 | ||
1386 | /* splice the subbuffer to the tracefile */ | |
91dfef6e | 1387 | ret = lttng_consumer_on_read_subbuffer_splice(ctx, stream, subbuf_size, |
309167d2 | 1388 | padding, &index); |
91dfef6e DG |
1389 | /* |
1390 | * XXX: Splice does not support network streaming so the return value | |
1391 | * is simply checked against subbuf_size and not like the mmap() op. | |
1392 | */ | |
1d4dfdef DG |
1393 | if (ret != subbuf_size) { |
1394 | /* | |
1395 | * display the error but continue processing to try | |
1396 | * to release the subbuffer | |
1397 | */ | |
1398 | ERR("Error splicing to tracefile (ret: %zd != len: %lu)", | |
1399 | ret, subbuf_size); | |
309167d2 | 1400 | write_index = 0; |
1d4dfdef DG |
1401 | } |
1402 | break; | |
07b86b52 | 1403 | case CONSUMER_CHANNEL_MMAP: |
1d4dfdef DG |
1404 | /* Get subbuffer size without padding */ |
1405 | err = kernctl_get_subbuf_size(infd, &subbuf_size); | |
1406 | if (err != 0) { | |
5a510c9f | 1407 | PERROR("Getting sub-buffer len failed."); |
8265f19e MD |
1408 | err = kernctl_put_subbuf(infd); |
1409 | if (err != 0) { | |
32af2c95 | 1410 | if (err == -EFAULT) { |
5a510c9f | 1411 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1412 | } else if (err == -EIO) { |
8265f19e | 1413 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1414 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e | 1415 | } |
32af2c95 | 1416 | ret = err; |
8265f19e MD |
1417 | goto end; |
1418 | } | |
32af2c95 | 1419 | ret = err; |
1d4dfdef DG |
1420 | goto end; |
1421 | } | |
47e81c02 | 1422 | |
1d4dfdef DG |
1423 | /* Make sure the tracer is not gone mad on us! */ |
1424 | assert(len >= subbuf_size); | |
1425 | ||
1426 | padding = len - subbuf_size; | |
1427 | ||
1428 | /* write the subbuffer to the tracefile */ | |
91dfef6e | 1429 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, |
309167d2 | 1430 | padding, &index); |
91dfef6e DG |
1431 | /* |
1432 | * The mmap operation should write subbuf_size amount of data when | |
1433 | * network streaming or the full padding (len) size when we are _not_ | |
1434 | * streaming. | |
1435 | */ | |
d88aee68 DG |
1436 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
1437 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
1d4dfdef | 1438 | /* |
91dfef6e | 1439 | * Display the error but continue processing to try to release the |
2336629e DG |
1440 | * subbuffer. This is a DBG statement since this is possible to |
1441 | * happen without being a critical error. | |
1d4dfdef | 1442 | */ |
2336629e | 1443 | DBG("Error writing to tracefile " |
91dfef6e DG |
1444 | "(ret: %zd != len: %lu != subbuf_size: %lu)", |
1445 | ret, len, subbuf_size); | |
309167d2 | 1446 | write_index = 0; |
1d4dfdef DG |
1447 | } |
1448 | break; | |
1449 | default: | |
1450 | ERR("Unknown output method"); | |
56591bac | 1451 | ret = -EPERM; |
d41f73b7 MD |
1452 | } |
1453 | ||
1454 | err = kernctl_put_next_subbuf(infd); | |
1455 | if (err != 0) { | |
32af2c95 | 1456 | if (err == -EFAULT) { |
5a510c9f | 1457 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1458 | } else if (err == -EIO) { |
d41f73b7 | 1459 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1460 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
d41f73b7 | 1461 | } |
32af2c95 | 1462 | ret = err; |
d41f73b7 MD |
1463 | goto end; |
1464 | } | |
1465 | ||
309167d2 | 1466 | /* Write index if needed. */ |
1c20f0e2 JD |
1467 | if (!write_index) { |
1468 | goto end; | |
1469 | } | |
1470 | ||
94d49140 JD |
1471 | if (stream->chan->live_timer_interval && !stream->metadata_flag) { |
1472 | /* | |
1473 | * In live, block until all the metadata is sent. | |
1474 | */ | |
c585821b MD |
1475 | pthread_mutex_lock(&stream->metadata_timer_lock); |
1476 | assert(!stream->missed_metadata_flush); | |
1477 | stream->waiting_on_metadata = true; | |
1478 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1479 | ||
94d49140 | 1480 | err = consumer_stream_sync_metadata(ctx, stream->session_id); |
c585821b MD |
1481 | |
1482 | pthread_mutex_lock(&stream->metadata_timer_lock); | |
1483 | stream->waiting_on_metadata = false; | |
1484 | if (stream->missed_metadata_flush) { | |
1485 | stream->missed_metadata_flush = false; | |
1486 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1487 | (void) consumer_flush_kernel_index(stream); | |
1488 | } else { | |
1489 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1490 | } | |
94d49140 JD |
1491 | if (err < 0) { |
1492 | goto end; | |
1493 | } | |
1494 | } | |
1495 | ||
1c20f0e2 JD |
1496 | err = consumer_stream_write_index(stream, &index); |
1497 | if (err < 0) { | |
1498 | goto end; | |
309167d2 JD |
1499 | } |
1500 | ||
d41f73b7 MD |
1501 | end: |
1502 | return ret; | |
1503 | } | |
1504 | ||
1505 | int lttng_kconsumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
1506 | { | |
1507 | int ret; | |
ffe60014 DG |
1508 | |
1509 | assert(stream); | |
1510 | ||
2bba9e53 DG |
1511 | /* |
1512 | * Don't create anything if this is set for streaming or should not be | |
1513 | * monitored. | |
1514 | */ | |
1515 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { | |
fe4477ee JD |
1516 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
1517 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
309167d2 | 1518 | stream->uid, stream->gid, NULL); |
fe4477ee JD |
1519 | if (ret < 0) { |
1520 | goto error; | |
1521 | } | |
1522 | stream->out_fd = ret; | |
1523 | stream->tracefile_size_current = 0; | |
309167d2 JD |
1524 | |
1525 | if (!stream->metadata_flag) { | |
e0547b83 MD |
1526 | struct lttng_index_file *index_file; |
1527 | ||
1528 | index_file = lttng_index_file_create(stream->chan->pathname, | |
309167d2 JD |
1529 | stream->name, stream->uid, stream->gid, |
1530 | stream->chan->tracefile_size, | |
e0547b83 MD |
1531 | stream->tracefile_count_current, |
1532 | CTF_INDEX_MAJOR, CTF_INDEX_MINOR); | |
1533 | if (!index_file) { | |
309167d2 JD |
1534 | goto error; |
1535 | } | |
e0547b83 | 1536 | stream->index_file = index_file; |
309167d2 | 1537 | } |
ffe60014 | 1538 | } |
d41f73b7 | 1539 | |
d41f73b7 MD |
1540 | if (stream->output == LTTNG_EVENT_MMAP) { |
1541 | /* get the len of the mmap region */ | |
1542 | unsigned long mmap_len; | |
1543 | ||
1544 | ret = kernctl_get_mmap_len(stream->wait_fd, &mmap_len); | |
1545 | if (ret != 0) { | |
ffe60014 | 1546 | PERROR("kernctl_get_mmap_len"); |
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 | } |