Commit | Line | Data |
---|---|---|
3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
b3530820 | 4 | * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
3bd1e081 | 5 | * |
d14d33bf AM |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License, version 2 only, | |
8 | * as published by the Free Software Foundation. | |
3bd1e081 MD |
9 | * |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
d14d33bf AM |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
3bd1e081 MD |
18 | */ |
19 | ||
6c1c0768 | 20 | #define _LGPL_SOURCE |
3bd1e081 | 21 | #include <assert.h> |
3bd1e081 MD |
22 | #include <poll.h> |
23 | #include <pthread.h> | |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | #include <sys/mman.h> | |
27 | #include <sys/socket.h> | |
28 | #include <sys/types.h> | |
77c7c900 | 29 | #include <inttypes.h> |
3bd1e081 | 30 | #include <unistd.h> |
dbb5dfe6 | 31 | #include <sys/stat.h> |
3bd1e081 | 32 | |
51a9e1c7 | 33 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 34 | #include <common/common.h> |
10a8a223 | 35 | #include <common/kernel-ctl/kernel-ctl.h> |
10a8a223 | 36 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 37 | #include <common/sessiond-comm/relayd.h> |
dbb5dfe6 | 38 | #include <common/compat/fcntl.h> |
f263b7fd | 39 | #include <common/compat/endian.h> |
acdb9057 | 40 | #include <common/pipe.h> |
00e2e675 | 41 | #include <common/relayd/relayd.h> |
fe4477ee | 42 | #include <common/utils.h> |
c8fea79c | 43 | #include <common/consumer/consumer-stream.h> |
309167d2 | 44 | #include <common/index/index.h> |
c8fea79c | 45 | #include <common/consumer/consumer-timer.h> |
0857097f | 46 | |
10a8a223 | 47 | #include "kernel-consumer.h" |
3bd1e081 MD |
48 | |
49 | extern struct lttng_consumer_global_data consumer_data; | |
50 | extern int consumer_poll_timeout; | |
51 | extern volatile int consumer_quit; | |
52 | ||
3bd1e081 MD |
53 | /* |
54 | * Take a snapshot for a specific fd | |
55 | * | |
56 | * Returns 0 on success, < 0 on error | |
57 | */ | |
ffe60014 | 58 | int lttng_kconsumer_take_snapshot(struct lttng_consumer_stream *stream) |
3bd1e081 MD |
59 | { |
60 | int ret = 0; | |
61 | int infd = stream->wait_fd; | |
62 | ||
63 | ret = kernctl_snapshot(infd); | |
64 | if (ret != 0) { | |
5a510c9f | 65 | PERROR("Getting sub-buffer snapshot."); |
3bd1e081 MD |
66 | } |
67 | ||
68 | return ret; | |
69 | } | |
70 | ||
e9404c27 JG |
71 | /* |
72 | * Sample consumed and produced positions for a specific fd. | |
73 | * | |
74 | * Returns 0 on success, < 0 on error. | |
75 | */ | |
76 | int lttng_kconsumer_sample_snapshot_positions( | |
77 | struct lttng_consumer_stream *stream) | |
78 | { | |
79 | assert(stream); | |
80 | ||
81 | return kernctl_snapshot_sample_positions(stream->wait_fd); | |
82 | } | |
83 | ||
3bd1e081 MD |
84 | /* |
85 | * Get the produced position | |
86 | * | |
87 | * Returns 0 on success, < 0 on error | |
88 | */ | |
ffe60014 | 89 | int lttng_kconsumer_get_produced_snapshot(struct lttng_consumer_stream *stream, |
3bd1e081 MD |
90 | unsigned long *pos) |
91 | { | |
92 | int ret; | |
93 | int infd = stream->wait_fd; | |
94 | ||
95 | ret = kernctl_snapshot_get_produced(infd, pos); | |
96 | if (ret != 0) { | |
5a510c9f | 97 | PERROR("kernctl_snapshot_get_produced"); |
3bd1e081 MD |
98 | } |
99 | ||
100 | return ret; | |
101 | } | |
102 | ||
07b86b52 JD |
103 | /* |
104 | * Get the consumerd position | |
105 | * | |
106 | * Returns 0 on success, < 0 on error | |
107 | */ | |
108 | int lttng_kconsumer_get_consumed_snapshot(struct lttng_consumer_stream *stream, | |
109 | unsigned long *pos) | |
110 | { | |
111 | int ret; | |
112 | int infd = stream->wait_fd; | |
113 | ||
114 | ret = kernctl_snapshot_get_consumed(infd, pos); | |
115 | if (ret != 0) { | |
5a510c9f | 116 | PERROR("kernctl_snapshot_get_consumed"); |
07b86b52 JD |
117 | } |
118 | ||
119 | return ret; | |
120 | } | |
121 | ||
07b86b52 JD |
122 | /* |
123 | * Take a snapshot of all the stream of a channel | |
124 | * | |
125 | * Returns 0 on success, < 0 on error | |
126 | */ | |
127 | int lttng_kconsumer_snapshot_channel(uint64_t key, char *path, | |
d07ceecd | 128 | uint64_t relayd_id, uint64_t nb_packets_per_stream, |
5c786ded | 129 | struct lttng_consumer_local_data *ctx) |
07b86b52 JD |
130 | { |
131 | int ret; | |
07b86b52 JD |
132 | struct lttng_consumer_channel *channel; |
133 | struct lttng_consumer_stream *stream; | |
134 | ||
6a00837f | 135 | DBG("Kernel consumer snapshot channel %" PRIu64, key); |
07b86b52 JD |
136 | |
137 | rcu_read_lock(); | |
138 | ||
139 | channel = consumer_find_channel(key); | |
140 | if (!channel) { | |
6a00837f | 141 | ERR("No channel found for key %" PRIu64, key); |
07b86b52 JD |
142 | ret = -1; |
143 | goto end; | |
144 | } | |
145 | ||
146 | /* Splice is not supported yet for channel snapshot. */ | |
147 | if (channel->output != CONSUMER_CHANNEL_MMAP) { | |
148 | ERR("Unsupported output %d", channel->output); | |
149 | ret = -1; | |
150 | goto end; | |
151 | } | |
152 | ||
10a50311 | 153 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { |
c13082a9 JD |
154 | /* Are we at a position _before_ the first available packet ? */ |
155 | bool before_first_packet = true; | |
923333cd | 156 | unsigned long consumed_pos, produced_pos; |
9ce5646a MD |
157 | |
158 | health_code_update(); | |
159 | ||
07b86b52 JD |
160 | /* |
161 | * Lock stream because we are about to change its state. | |
162 | */ | |
163 | pthread_mutex_lock(&stream->lock); | |
164 | ||
29decac3 DG |
165 | /* |
166 | * Assign the received relayd ID so we can use it for streaming. The streams | |
167 | * are not visible to anyone so this is OK to change it. | |
168 | */ | |
07b86b52 JD |
169 | stream->net_seq_idx = relayd_id; |
170 | channel->relayd_id = relayd_id; | |
171 | if (relayd_id != (uint64_t) -1ULL) { | |
10a50311 | 172 | ret = consumer_send_relayd_stream(stream, path); |
07b86b52 JD |
173 | if (ret < 0) { |
174 | ERR("sending stream to relayd"); | |
175 | goto end_unlock; | |
176 | } | |
07b86b52 JD |
177 | } else { |
178 | ret = utils_create_stream_file(path, stream->name, | |
10a50311 JD |
179 | stream->chan->tracefile_size, |
180 | stream->tracefile_count_current, | |
309167d2 | 181 | stream->uid, stream->gid, NULL); |
07b86b52 JD |
182 | if (ret < 0) { |
183 | ERR("utils_create_stream_file"); | |
184 | goto end_unlock; | |
185 | } | |
186 | ||
187 | stream->out_fd = ret; | |
188 | stream->tracefile_size_current = 0; | |
189 | ||
81ea21bf MD |
190 | DBG("Kernel consumer snapshot stream %s/%s (%" PRIu64 ")", |
191 | path, stream->name, stream->key); | |
07b86b52 | 192 | } |
601262d6 JD |
193 | if (relayd_id != -1ULL) { |
194 | ret = consumer_send_relayd_streams_sent(relayd_id); | |
195 | if (ret < 0) { | |
196 | ERR("sending streams sent to relayd"); | |
197 | goto end_unlock; | |
198 | } | |
1bf914e0 | 199 | channel->streams_sent_to_relayd = true; |
a4baae1b | 200 | } |
07b86b52 | 201 | |
213643b9 | 202 | ret = kernctl_buffer_flush_empty(stream->wait_fd); |
07b86b52 | 203 | if (ret < 0) { |
213643b9 MD |
204 | /* |
205 | * Doing a buffer flush which does not take into | |
206 | * account empty packets. This is not perfect | |
207 | * for stream intersection, but required as a | |
208 | * fall-back when "flush_empty" is not | |
209 | * implemented by lttng-modules. | |
210 | */ | |
211 | ret = kernctl_buffer_flush(stream->wait_fd); | |
212 | if (ret < 0) { | |
213 | ERR("Failed to flush kernel stream"); | |
214 | goto end_unlock; | |
215 | } | |
07b86b52 JD |
216 | goto end_unlock; |
217 | } | |
218 | ||
219 | ret = lttng_kconsumer_take_snapshot(stream); | |
220 | if (ret < 0) { | |
221 | ERR("Taking kernel snapshot"); | |
222 | goto end_unlock; | |
223 | } | |
224 | ||
225 | ret = lttng_kconsumer_get_produced_snapshot(stream, &produced_pos); | |
226 | if (ret < 0) { | |
227 | ERR("Produced kernel snapshot position"); | |
228 | goto end_unlock; | |
229 | } | |
230 | ||
231 | ret = lttng_kconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
232 | if (ret < 0) { | |
233 | ERR("Consumerd kernel snapshot position"); | |
234 | goto end_unlock; | |
235 | } | |
236 | ||
237 | if (stream->max_sb_size == 0) { | |
238 | ret = kernctl_get_max_subbuf_size(stream->wait_fd, | |
239 | &stream->max_sb_size); | |
240 | if (ret < 0) { | |
241 | ERR("Getting kernel max_sb_size"); | |
242 | goto end_unlock; | |
243 | } | |
244 | } | |
245 | ||
d07ceecd MD |
246 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
247 | produced_pos, nb_packets_per_stream, | |
248 | stream->max_sb_size); | |
5c786ded | 249 | |
07b86b52 JD |
250 | while (consumed_pos < produced_pos) { |
251 | ssize_t read_len; | |
252 | unsigned long len, padded_len; | |
c13082a9 | 253 | int lost_packet = 0; |
07b86b52 | 254 | |
9ce5646a MD |
255 | health_code_update(); |
256 | ||
07b86b52 JD |
257 | DBG("Kernel consumer taking snapshot at pos %lu", consumed_pos); |
258 | ||
259 | ret = kernctl_get_subbuf(stream->wait_fd, &consumed_pos); | |
260 | if (ret < 0) { | |
32af2c95 | 261 | if (ret != -EAGAIN) { |
07b86b52 JD |
262 | PERROR("kernctl_get_subbuf snapshot"); |
263 | goto end_unlock; | |
264 | } | |
265 | DBG("Kernel consumer get subbuf failed. Skipping it."); | |
266 | consumed_pos += stream->max_sb_size; | |
c13082a9 JD |
267 | |
268 | /* | |
269 | * Start accounting lost packets only when we | |
270 | * already have extracted packets (to match the | |
271 | * content of the final snapshot). | |
272 | */ | |
273 | if (!before_first_packet) { | |
274 | lost_packet = 1; | |
275 | } | |
07b86b52 JD |
276 | continue; |
277 | } | |
278 | ||
279 | ret = kernctl_get_subbuf_size(stream->wait_fd, &len); | |
280 | if (ret < 0) { | |
281 | ERR("Snapshot kernctl_get_subbuf_size"); | |
29decac3 | 282 | goto error_put_subbuf; |
07b86b52 JD |
283 | } |
284 | ||
285 | ret = kernctl_get_padded_subbuf_size(stream->wait_fd, &padded_len); | |
286 | if (ret < 0) { | |
287 | ERR("Snapshot kernctl_get_padded_subbuf_size"); | |
29decac3 | 288 | goto error_put_subbuf; |
07b86b52 JD |
289 | } |
290 | ||
291 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
309167d2 | 292 | padded_len - len, NULL); |
07b86b52 | 293 | /* |
29decac3 DG |
294 | * We write the padded len in local tracefiles but the data len |
295 | * when using a relay. Display the error but continue processing | |
296 | * to try to release the subbuffer. | |
07b86b52 JD |
297 | */ |
298 | if (relayd_id != (uint64_t) -1ULL) { | |
299 | if (read_len != len) { | |
300 | ERR("Error sending to the relay (ret: %zd != len: %lu)", | |
301 | read_len, len); | |
302 | } | |
303 | } else { | |
304 | if (read_len != padded_len) { | |
305 | ERR("Error writing to tracefile (ret: %zd != len: %lu)", | |
306 | read_len, padded_len); | |
307 | } | |
308 | } | |
309 | ||
310 | ret = kernctl_put_subbuf(stream->wait_fd); | |
311 | if (ret < 0) { | |
312 | ERR("Snapshot kernctl_put_subbuf"); | |
313 | goto end_unlock; | |
314 | } | |
315 | consumed_pos += stream->max_sb_size; | |
c13082a9 JD |
316 | |
317 | /* | |
318 | * Only account lost packets located between | |
319 | * succesfully extracted packets (do not account before | |
320 | * and after since they are not visible in the | |
321 | * resulting snapshot). | |
322 | */ | |
323 | stream->chan->lost_packets += lost_packet; | |
324 | lost_packet = 0; | |
325 | before_first_packet = false; | |
07b86b52 JD |
326 | } |
327 | ||
328 | if (relayd_id == (uint64_t) -1ULL) { | |
fdf9986c MD |
329 | if (stream->out_fd >= 0) { |
330 | ret = close(stream->out_fd); | |
331 | if (ret < 0) { | |
332 | PERROR("Kernel consumer snapshot close out_fd"); | |
333 | goto end_unlock; | |
334 | } | |
335 | stream->out_fd = -1; | |
07b86b52 | 336 | } |
07b86b52 JD |
337 | } else { |
338 | close_relayd_stream(stream); | |
339 | stream->net_seq_idx = (uint64_t) -1ULL; | |
340 | } | |
341 | pthread_mutex_unlock(&stream->lock); | |
342 | } | |
343 | ||
344 | /* All good! */ | |
345 | ret = 0; | |
346 | goto end; | |
347 | ||
29decac3 DG |
348 | error_put_subbuf: |
349 | ret = kernctl_put_subbuf(stream->wait_fd); | |
350 | if (ret < 0) { | |
351 | ERR("Snapshot kernctl_put_subbuf error path"); | |
352 | } | |
07b86b52 JD |
353 | end_unlock: |
354 | pthread_mutex_unlock(&stream->lock); | |
355 | end: | |
356 | rcu_read_unlock(); | |
357 | return ret; | |
358 | } | |
359 | ||
360 | /* | |
361 | * Read the whole metadata available for a snapshot. | |
362 | * | |
363 | * Returns 0 on success, < 0 on error | |
364 | */ | |
365 | int lttng_kconsumer_snapshot_metadata(uint64_t key, char *path, | |
e2039c7a | 366 | uint64_t relayd_id, struct lttng_consumer_local_data *ctx) |
07b86b52 | 367 | { |
d771f832 DG |
368 | int ret, use_relayd = 0; |
369 | ssize_t ret_read; | |
07b86b52 JD |
370 | struct lttng_consumer_channel *metadata_channel; |
371 | struct lttng_consumer_stream *metadata_stream; | |
d771f832 DG |
372 | |
373 | assert(ctx); | |
07b86b52 JD |
374 | |
375 | DBG("Kernel consumer snapshot metadata with key %" PRIu64 " at path %s", | |
376 | key, path); | |
377 | ||
378 | rcu_read_lock(); | |
379 | ||
380 | metadata_channel = consumer_find_channel(key); | |
381 | if (!metadata_channel) { | |
d771f832 | 382 | ERR("Kernel snapshot metadata not found for key %" PRIu64, key); |
07b86b52 | 383 | ret = -1; |
d771f832 | 384 | goto error; |
07b86b52 JD |
385 | } |
386 | ||
387 | metadata_stream = metadata_channel->metadata_stream; | |
388 | assert(metadata_stream); | |
389 | ||
d771f832 | 390 | /* Flag once that we have a valid relayd for the stream. */ |
e2039c7a | 391 | if (relayd_id != (uint64_t) -1ULL) { |
d771f832 DG |
392 | use_relayd = 1; |
393 | } | |
394 | ||
395 | if (use_relayd) { | |
10a50311 | 396 | ret = consumer_send_relayd_stream(metadata_stream, path); |
e2039c7a | 397 | if (ret < 0) { |
d771f832 | 398 | goto error; |
e2039c7a | 399 | } |
e2039c7a JD |
400 | } else { |
401 | ret = utils_create_stream_file(path, metadata_stream->name, | |
402 | metadata_stream->chan->tracefile_size, | |
403 | metadata_stream->tracefile_count_current, | |
309167d2 | 404 | metadata_stream->uid, metadata_stream->gid, NULL); |
e2039c7a | 405 | if (ret < 0) { |
d771f832 | 406 | goto error; |
e2039c7a JD |
407 | } |
408 | metadata_stream->out_fd = ret; | |
07b86b52 | 409 | } |
07b86b52 | 410 | |
d771f832 | 411 | do { |
9ce5646a MD |
412 | health_code_update(); |
413 | ||
d771f832 DG |
414 | ret_read = lttng_kconsumer_read_subbuffer(metadata_stream, ctx); |
415 | if (ret_read < 0) { | |
56591bac | 416 | if (ret_read != -EAGAIN) { |
6a00837f | 417 | ERR("Kernel snapshot reading metadata subbuffer (ret: %zd)", |
d771f832 DG |
418 | ret_read); |
419 | goto error; | |
07b86b52 | 420 | } |
d771f832 | 421 | /* ret_read is negative at this point so we will exit the loop. */ |
07b86b52 JD |
422 | continue; |
423 | } | |
d771f832 | 424 | } while (ret_read >= 0); |
07b86b52 | 425 | |
d771f832 DG |
426 | if (use_relayd) { |
427 | close_relayd_stream(metadata_stream); | |
428 | metadata_stream->net_seq_idx = (uint64_t) -1ULL; | |
429 | } else { | |
fdf9986c MD |
430 | if (metadata_stream->out_fd >= 0) { |
431 | ret = close(metadata_stream->out_fd); | |
432 | if (ret < 0) { | |
433 | PERROR("Kernel consumer snapshot metadata close out_fd"); | |
434 | /* | |
435 | * Don't go on error here since the snapshot was successful at this | |
436 | * point but somehow the close failed. | |
437 | */ | |
438 | } | |
439 | metadata_stream->out_fd = -1; | |
e2039c7a | 440 | } |
e2039c7a JD |
441 | } |
442 | ||
07b86b52 | 443 | ret = 0; |
d771f832 | 444 | |
cf53a8a6 JD |
445 | cds_list_del(&metadata_stream->send_node); |
446 | consumer_stream_destroy(metadata_stream, NULL); | |
447 | metadata_channel->metadata_stream = NULL; | |
d771f832 | 448 | error: |
07b86b52 JD |
449 | rcu_read_unlock(); |
450 | return ret; | |
451 | } | |
452 | ||
1803a064 MD |
453 | /* |
454 | * Receive command from session daemon and process it. | |
455 | * | |
456 | * Return 1 on success else a negative value or 0. | |
457 | */ | |
3bd1e081 MD |
458 | int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
459 | int sock, struct pollfd *consumer_sockpoll) | |
460 | { | |
461 | ssize_t ret; | |
0c759fc9 | 462 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 MD |
463 | struct lttcomm_consumer_msg msg; |
464 | ||
9ce5646a MD |
465 | health_code_update(); |
466 | ||
3bd1e081 MD |
467 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
468 | if (ret != sizeof(msg)) { | |
1803a064 | 469 | if (ret > 0) { |
c6857fcf | 470 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
1803a064 MD |
471 | ret = -1; |
472 | } | |
3bd1e081 MD |
473 | return ret; |
474 | } | |
9ce5646a MD |
475 | |
476 | health_code_update(); | |
477 | ||
84382d49 MD |
478 | /* Deprecated command */ |
479 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 480 | |
9ce5646a MD |
481 | health_code_update(); |
482 | ||
b0b335c8 MD |
483 | /* relayd needs RCU read-side protection */ |
484 | rcu_read_lock(); | |
485 | ||
3bd1e081 | 486 | switch (msg.cmd_type) { |
00e2e675 DG |
487 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
488 | { | |
f50f23d9 | 489 | /* Session daemon status message are handled in the following call. */ |
7735ef9e DG |
490 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
491 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, | |
d3e2ba59 JD |
492 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
493 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
494 | goto end_nosignal; |
495 | } | |
3bd1e081 MD |
496 | case LTTNG_CONSUMER_ADD_CHANNEL: |
497 | { | |
498 | struct lttng_consumer_channel *new_channel; | |
e43c41c5 | 499 | int ret_recv; |
3bd1e081 | 500 | |
9ce5646a MD |
501 | health_code_update(); |
502 | ||
f50f23d9 DG |
503 | /* First send a status message before receiving the fds. */ |
504 | ret = consumer_send_status_msg(sock, ret_code); | |
505 | if (ret < 0) { | |
506 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 507 | goto error_fatal; |
f50f23d9 | 508 | } |
9ce5646a MD |
509 | |
510 | health_code_update(); | |
511 | ||
d88aee68 | 512 | DBG("consumer_add_channel %" PRIu64, msg.u.channel.channel_key); |
3bd1e081 | 513 | new_channel = consumer_allocate_channel(msg.u.channel.channel_key, |
ffe60014 DG |
514 | msg.u.channel.session_id, msg.u.channel.pathname, |
515 | msg.u.channel.name, msg.u.channel.uid, msg.u.channel.gid, | |
1624d5b7 JD |
516 | msg.u.channel.relayd_id, msg.u.channel.output, |
517 | msg.u.channel.tracefile_size, | |
1950109e | 518 | msg.u.channel.tracefile_count, 0, |
ecc48a90 | 519 | msg.u.channel.monitor, |
d7ba1388 | 520 | msg.u.channel.live_timer_interval, |
3d071855 | 521 | NULL, NULL); |
3bd1e081 | 522 | if (new_channel == NULL) { |
f73fabfd | 523 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
3bd1e081 MD |
524 | goto end_nosignal; |
525 | } | |
ffe60014 | 526 | new_channel->nb_init_stream_left = msg.u.channel.nb_init_streams; |
95a1109b JD |
527 | switch (msg.u.channel.output) { |
528 | case LTTNG_EVENT_SPLICE: | |
529 | new_channel->output = CONSUMER_CHANNEL_SPLICE; | |
530 | break; | |
531 | case LTTNG_EVENT_MMAP: | |
532 | new_channel->output = CONSUMER_CHANNEL_MMAP; | |
533 | break; | |
534 | default: | |
535 | ERR("Channel output unknown %d", msg.u.channel.output); | |
536 | goto end_nosignal; | |
537 | } | |
ffe60014 DG |
538 | |
539 | /* Translate and save channel type. */ | |
540 | switch (msg.u.channel.type) { | |
541 | case CONSUMER_CHANNEL_TYPE_DATA: | |
542 | case CONSUMER_CHANNEL_TYPE_METADATA: | |
543 | new_channel->type = msg.u.channel.type; | |
544 | break; | |
545 | default: | |
546 | assert(0); | |
547 | goto end_nosignal; | |
548 | }; | |
549 | ||
9ce5646a MD |
550 | health_code_update(); |
551 | ||
3bd1e081 | 552 | if (ctx->on_recv_channel != NULL) { |
e43c41c5 JD |
553 | ret_recv = ctx->on_recv_channel(new_channel); |
554 | if (ret_recv == 0) { | |
555 | ret = consumer_add_channel(new_channel, ctx); | |
556 | } else if (ret_recv < 0) { | |
3bd1e081 MD |
557 | goto end_nosignal; |
558 | } | |
559 | } else { | |
e43c41c5 | 560 | ret = consumer_add_channel(new_channel, ctx); |
3bd1e081 | 561 | } |
e9404c27 JG |
562 | if (msg.u.channel.type == CONSUMER_CHANNEL_TYPE_DATA && !ret) { |
563 | int monitor_start_ret; | |
564 | ||
565 | DBG("Consumer starting monitor timer"); | |
94d49140 JD |
566 | consumer_timer_live_start(new_channel, |
567 | msg.u.channel.live_timer_interval); | |
e9404c27 JG |
568 | monitor_start_ret = consumer_timer_monitor_start( |
569 | new_channel, | |
570 | msg.u.channel.monitor_timer_interval); | |
571 | if (monitor_start_ret < 0) { | |
572 | ERR("Starting channel monitoring timer failed"); | |
573 | goto end_nosignal; | |
574 | } | |
575 | ||
94d49140 | 576 | } |
e43c41c5 | 577 | |
9ce5646a MD |
578 | health_code_update(); |
579 | ||
e43c41c5 | 580 | /* If we received an error in add_channel, we need to report it. */ |
821fffb2 | 581 | if (ret < 0) { |
1803a064 MD |
582 | ret = consumer_send_status_msg(sock, ret); |
583 | if (ret < 0) { | |
584 | goto error_fatal; | |
585 | } | |
e43c41c5 JD |
586 | goto end_nosignal; |
587 | } | |
588 | ||
3bd1e081 MD |
589 | goto end_nosignal; |
590 | } | |
591 | case LTTNG_CONSUMER_ADD_STREAM: | |
592 | { | |
dae10966 DG |
593 | int fd; |
594 | struct lttng_pipe *stream_pipe; | |
00e2e675 | 595 | struct lttng_consumer_stream *new_stream; |
ffe60014 | 596 | struct lttng_consumer_channel *channel; |
c80048c6 | 597 | int alloc_ret = 0; |
3bd1e081 | 598 | |
ffe60014 DG |
599 | /* |
600 | * Get stream's channel reference. Needed when adding the stream to the | |
601 | * global hash table. | |
602 | */ | |
603 | channel = consumer_find_channel(msg.u.stream.channel_key); | |
604 | if (!channel) { | |
605 | /* | |
606 | * We could not find the channel. Can happen if cpu hotplug | |
607 | * happens while tearing down. | |
608 | */ | |
d88aee68 | 609 | ERR("Unable to find channel key %" PRIu64, msg.u.stream.channel_key); |
e462382a | 610 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
ffe60014 DG |
611 | } |
612 | ||
9ce5646a MD |
613 | health_code_update(); |
614 | ||
f50f23d9 DG |
615 | /* First send a status message before receiving the fds. */ |
616 | ret = consumer_send_status_msg(sock, ret_code); | |
1803a064 | 617 | if (ret < 0) { |
d771f832 | 618 | /* Somehow, the session daemon is not responding anymore. */ |
1803a064 MD |
619 | goto error_fatal; |
620 | } | |
9ce5646a MD |
621 | |
622 | health_code_update(); | |
623 | ||
0c759fc9 | 624 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
d771f832 | 625 | /* Channel was not found. */ |
f50f23d9 DG |
626 | goto end_nosignal; |
627 | } | |
628 | ||
d771f832 | 629 | /* Blocking call */ |
9ce5646a MD |
630 | health_poll_entry(); |
631 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
632 | health_poll_exit(); | |
84382d49 MD |
633 | if (ret) { |
634 | goto error_fatal; | |
3bd1e081 | 635 | } |
00e2e675 | 636 | |
9ce5646a MD |
637 | health_code_update(); |
638 | ||
00e2e675 | 639 | /* Get stream file descriptor from socket */ |
f2fc6720 MD |
640 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); |
641 | if (ret != sizeof(fd)) { | |
f73fabfd | 642 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
3f8e211f | 643 | rcu_read_unlock(); |
3bd1e081 MD |
644 | return ret; |
645 | } | |
3bd1e081 | 646 | |
9ce5646a MD |
647 | health_code_update(); |
648 | ||
f50f23d9 DG |
649 | /* |
650 | * Send status code to session daemon only if the recv works. If the | |
651 | * above recv() failed, the session daemon is notified through the | |
652 | * error socket and the teardown is eventually done. | |
653 | */ | |
654 | ret = consumer_send_status_msg(sock, ret_code); | |
655 | if (ret < 0) { | |
656 | /* Somehow, the session daemon is not responding anymore. */ | |
657 | goto end_nosignal; | |
658 | } | |
659 | ||
9ce5646a MD |
660 | health_code_update(); |
661 | ||
ffe60014 DG |
662 | new_stream = consumer_allocate_stream(channel->key, |
663 | fd, | |
664 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
665 | channel->name, | |
666 | channel->uid, | |
667 | channel->gid, | |
668 | channel->relayd_id, | |
669 | channel->session_id, | |
670 | msg.u.stream.cpu, | |
671 | &alloc_ret, | |
4891ece8 DG |
672 | channel->type, |
673 | channel->monitor); | |
3bd1e081 | 674 | if (new_stream == NULL) { |
c80048c6 MD |
675 | switch (alloc_ret) { |
676 | case -ENOMEM: | |
677 | case -EINVAL: | |
678 | default: | |
679 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
680 | break; | |
c80048c6 | 681 | } |
3f8e211f | 682 | goto end_nosignal; |
3bd1e081 | 683 | } |
d771f832 | 684 | |
ffe60014 DG |
685 | new_stream->chan = channel; |
686 | new_stream->wait_fd = fd; | |
07b86b52 JD |
687 | switch (channel->output) { |
688 | case CONSUMER_CHANNEL_SPLICE: | |
689 | new_stream->output = LTTNG_EVENT_SPLICE; | |
a2361a61 JD |
690 | ret = utils_create_pipe(new_stream->splice_pipe); |
691 | if (ret < 0) { | |
692 | goto end_nosignal; | |
693 | } | |
07b86b52 JD |
694 | break; |
695 | case CONSUMER_CHANNEL_MMAP: | |
696 | new_stream->output = LTTNG_EVENT_MMAP; | |
697 | break; | |
698 | default: | |
699 | ERR("Stream output unknown %d", channel->output); | |
700 | goto end_nosignal; | |
701 | } | |
00e2e675 | 702 | |
a0c83db9 DG |
703 | /* |
704 | * We've just assigned the channel to the stream so increment the | |
07b86b52 JD |
705 | * refcount right now. We don't need to increment the refcount for |
706 | * streams in no monitor because we handle manually the cleanup of | |
707 | * those. It is very important to make sure there is NO prior | |
708 | * consumer_del_stream() calls or else the refcount will be unbalanced. | |
a0c83db9 | 709 | */ |
07b86b52 JD |
710 | if (channel->monitor) { |
711 | uatomic_inc(&new_stream->chan->refcount); | |
712 | } | |
9d9353f9 | 713 | |
fb3a43a9 DG |
714 | /* |
715 | * The buffer flush is done on the session daemon side for the kernel | |
716 | * so no need for the stream "hangup_flush_done" variable to be | |
717 | * tracked. This is important for a kernel stream since we don't rely | |
718 | * on the flush state of the stream to read data. It's not the case for | |
719 | * user space tracing. | |
720 | */ | |
721 | new_stream->hangup_flush_done = 0; | |
722 | ||
9ce5646a MD |
723 | health_code_update(); |
724 | ||
633d0084 DG |
725 | if (ctx->on_recv_stream) { |
726 | ret = ctx->on_recv_stream(new_stream); | |
727 | if (ret < 0) { | |
d771f832 | 728 | consumer_stream_free(new_stream); |
633d0084 | 729 | goto end_nosignal; |
fb3a43a9 | 730 | } |
633d0084 | 731 | } |
fb3a43a9 | 732 | |
9ce5646a MD |
733 | health_code_update(); |
734 | ||
07b86b52 JD |
735 | if (new_stream->metadata_flag) { |
736 | channel->metadata_stream = new_stream; | |
737 | } | |
738 | ||
2bba9e53 DG |
739 | /* Do not monitor this stream. */ |
740 | if (!channel->monitor) { | |
5eecee74 | 741 | DBG("Kernel consumer add stream %s in no monitor mode with " |
6dc3064a | 742 | "relayd id %" PRIu64, new_stream->name, |
5eecee74 | 743 | new_stream->net_seq_idx); |
10a50311 | 744 | cds_list_add(&new_stream->send_node, &channel->streams.head); |
6dc3064a DG |
745 | break; |
746 | } | |
747 | ||
e1b71bdc DG |
748 | /* Send stream to relayd if the stream has an ID. */ |
749 | if (new_stream->net_seq_idx != (uint64_t) -1ULL) { | |
194ee077 DG |
750 | ret = consumer_send_relayd_stream(new_stream, |
751 | new_stream->chan->pathname); | |
e1b71bdc DG |
752 | if (ret < 0) { |
753 | consumer_stream_free(new_stream); | |
754 | goto end_nosignal; | |
755 | } | |
1bf914e0 MD |
756 | |
757 | /* | |
758 | * If adding an extra stream to an already | |
759 | * existing channel (e.g. cpu hotplug), we need | |
760 | * to send the "streams_sent" command to relayd. | |
761 | */ | |
762 | if (channel->streams_sent_to_relayd) { | |
763 | ret = consumer_send_relayd_streams_sent( | |
764 | new_stream->net_seq_idx); | |
765 | if (ret < 0) { | |
766 | goto end_nosignal; | |
767 | } | |
768 | } | |
e2039c7a JD |
769 | } |
770 | ||
50f8ae69 | 771 | /* Get the right pipe where the stream will be sent. */ |
633d0084 | 772 | if (new_stream->metadata_flag) { |
5ab66908 MD |
773 | ret = consumer_add_metadata_stream(new_stream); |
774 | if (ret) { | |
775 | ERR("Consumer add metadata stream %" PRIu64 " failed. Continuing", | |
776 | new_stream->key); | |
777 | consumer_stream_free(new_stream); | |
778 | goto end_nosignal; | |
779 | } | |
dae10966 | 780 | stream_pipe = ctx->consumer_metadata_pipe; |
3bd1e081 | 781 | } else { |
5ab66908 MD |
782 | ret = consumer_add_data_stream(new_stream); |
783 | if (ret) { | |
784 | ERR("Consumer add stream %" PRIu64 " failed. Continuing", | |
785 | new_stream->key); | |
786 | consumer_stream_free(new_stream); | |
787 | goto end_nosignal; | |
788 | } | |
dae10966 | 789 | stream_pipe = ctx->consumer_data_pipe; |
50f8ae69 DG |
790 | } |
791 | ||
5ab66908 MD |
792 | /* Vitible to other threads */ |
793 | new_stream->globally_visible = 1; | |
794 | ||
9ce5646a MD |
795 | health_code_update(); |
796 | ||
dae10966 | 797 | ret = lttng_pipe_write(stream_pipe, &new_stream, sizeof(new_stream)); |
50f8ae69 | 798 | if (ret < 0) { |
dae10966 | 799 | ERR("Consumer write %s stream to pipe %d", |
50f8ae69 | 800 | new_stream->metadata_flag ? "metadata" : "data", |
dae10966 | 801 | lttng_pipe_get_writefd(stream_pipe)); |
5ab66908 MD |
802 | if (new_stream->metadata_flag) { |
803 | consumer_del_stream_for_metadata(new_stream); | |
804 | } else { | |
805 | consumer_del_stream_for_data(new_stream); | |
806 | } | |
50f8ae69 | 807 | goto end_nosignal; |
3bd1e081 | 808 | } |
00e2e675 | 809 | |
50f8ae69 | 810 | DBG("Kernel consumer ADD_STREAM %s (fd: %d) with relayd id %" PRIu64, |
ffe60014 | 811 | new_stream->name, fd, new_stream->relayd_stream_id); |
3bd1e081 MD |
812 | break; |
813 | } | |
a4baae1b JD |
814 | case LTTNG_CONSUMER_STREAMS_SENT: |
815 | { | |
816 | struct lttng_consumer_channel *channel; | |
817 | ||
818 | /* | |
819 | * Get stream's channel reference. Needed when adding the stream to the | |
820 | * global hash table. | |
821 | */ | |
822 | channel = consumer_find_channel(msg.u.sent_streams.channel_key); | |
823 | if (!channel) { | |
824 | /* | |
825 | * We could not find the channel. Can happen if cpu hotplug | |
826 | * happens while tearing down. | |
827 | */ | |
828 | ERR("Unable to find channel key %" PRIu64, | |
829 | msg.u.sent_streams.channel_key); | |
e462382a | 830 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
a4baae1b JD |
831 | } |
832 | ||
833 | health_code_update(); | |
834 | ||
835 | /* | |
836 | * Send status code to session daemon. | |
837 | */ | |
838 | ret = consumer_send_status_msg(sock, ret_code); | |
f261ad0a | 839 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
a4baae1b JD |
840 | /* Somehow, the session daemon is not responding anymore. */ |
841 | goto end_nosignal; | |
842 | } | |
843 | ||
844 | health_code_update(); | |
845 | ||
846 | /* | |
847 | * We should not send this message if we don't monitor the | |
848 | * streams in this channel. | |
849 | */ | |
850 | if (!channel->monitor) { | |
851 | break; | |
852 | } | |
853 | ||
854 | health_code_update(); | |
855 | /* Send stream to relayd if the stream has an ID. */ | |
856 | if (msg.u.sent_streams.net_seq_idx != (uint64_t) -1ULL) { | |
857 | ret = consumer_send_relayd_streams_sent( | |
858 | msg.u.sent_streams.net_seq_idx); | |
859 | if (ret < 0) { | |
860 | goto end_nosignal; | |
861 | } | |
1bf914e0 | 862 | channel->streams_sent_to_relayd = true; |
a4baae1b JD |
863 | } |
864 | break; | |
865 | } | |
3bd1e081 MD |
866 | case LTTNG_CONSUMER_UPDATE_STREAM: |
867 | { | |
3f8e211f DG |
868 | rcu_read_unlock(); |
869 | return -ENOSYS; | |
870 | } | |
871 | case LTTNG_CONSUMER_DESTROY_RELAYD: | |
872 | { | |
a6ba4fe1 | 873 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
3f8e211f DG |
874 | struct consumer_relayd_sock_pair *relayd; |
875 | ||
a6ba4fe1 | 876 | DBG("Kernel consumer destroying relayd %" PRIu64, index); |
3f8e211f DG |
877 | |
878 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 879 | relayd = consumer_find_relayd(index); |
3f8e211f | 880 | if (relayd == NULL) { |
3448e266 | 881 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 882 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
3bd1e081 | 883 | } |
3f8e211f | 884 | |
a6ba4fe1 DG |
885 | /* |
886 | * Each relayd socket pair has a refcount of stream attached to it | |
887 | * which tells if the relayd is still active or not depending on the | |
888 | * refcount value. | |
889 | * | |
890 | * This will set the destroy flag of the relayd object and destroy it | |
891 | * if the refcount reaches zero when called. | |
892 | * | |
893 | * The destroy can happen either here or when a stream fd hangs up. | |
894 | */ | |
f50f23d9 DG |
895 | if (relayd) { |
896 | consumer_flag_relayd_for_destroy(relayd); | |
897 | } | |
898 | ||
9ce5646a MD |
899 | health_code_update(); |
900 | ||
f50f23d9 DG |
901 | ret = consumer_send_status_msg(sock, ret_code); |
902 | if (ret < 0) { | |
903 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 904 | goto error_fatal; |
f50f23d9 | 905 | } |
3f8e211f | 906 | |
3f8e211f | 907 | goto end_nosignal; |
3bd1e081 | 908 | } |
6d805429 | 909 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 910 | { |
c8f59ee5 | 911 | int32_t ret; |
6d805429 | 912 | uint64_t id = msg.u.data_pending.session_id; |
c8f59ee5 | 913 | |
6d805429 | 914 | DBG("Kernel consumer data pending command for id %" PRIu64, id); |
c8f59ee5 | 915 | |
6d805429 | 916 | ret = consumer_data_pending(id); |
c8f59ee5 | 917 | |
9ce5646a MD |
918 | health_code_update(); |
919 | ||
c8f59ee5 DG |
920 | /* Send back returned value to session daemon */ |
921 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
922 | if (ret < 0) { | |
6d805429 | 923 | PERROR("send data pending ret code"); |
1803a064 | 924 | goto error_fatal; |
c8f59ee5 | 925 | } |
f50f23d9 DG |
926 | |
927 | /* | |
928 | * No need to send back a status message since the data pending | |
929 | * returned value is the response. | |
930 | */ | |
c8f59ee5 | 931 | break; |
53632229 | 932 | } |
6dc3064a DG |
933 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
934 | { | |
07b86b52 JD |
935 | if (msg.u.snapshot_channel.metadata == 1) { |
936 | ret = lttng_kconsumer_snapshot_metadata(msg.u.snapshot_channel.key, | |
e2039c7a JD |
937 | msg.u.snapshot_channel.pathname, |
938 | msg.u.snapshot_channel.relayd_id, ctx); | |
07b86b52 JD |
939 | if (ret < 0) { |
940 | ERR("Snapshot metadata failed"); | |
e462382a | 941 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; |
07b86b52 JD |
942 | } |
943 | } else { | |
944 | ret = lttng_kconsumer_snapshot_channel(msg.u.snapshot_channel.key, | |
945 | msg.u.snapshot_channel.pathname, | |
5c786ded | 946 | msg.u.snapshot_channel.relayd_id, |
d07ceecd | 947 | msg.u.snapshot_channel.nb_packets_per_stream, |
5c786ded | 948 | ctx); |
07b86b52 JD |
949 | if (ret < 0) { |
950 | ERR("Snapshot channel failed"); | |
e462382a | 951 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
07b86b52 JD |
952 | } |
953 | } | |
954 | ||
9ce5646a MD |
955 | health_code_update(); |
956 | ||
6dc3064a DG |
957 | ret = consumer_send_status_msg(sock, ret_code); |
958 | if (ret < 0) { | |
959 | /* Somehow, the session daemon is not responding anymore. */ | |
960 | goto end_nosignal; | |
961 | } | |
962 | break; | |
963 | } | |
07b86b52 JD |
964 | case LTTNG_CONSUMER_DESTROY_CHANNEL: |
965 | { | |
966 | uint64_t key = msg.u.destroy_channel.key; | |
967 | struct lttng_consumer_channel *channel; | |
968 | ||
969 | channel = consumer_find_channel(key); | |
970 | if (!channel) { | |
971 | ERR("Kernel consumer destroy channel %" PRIu64 " not found", key); | |
e462382a | 972 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
07b86b52 JD |
973 | } |
974 | ||
9ce5646a MD |
975 | health_code_update(); |
976 | ||
07b86b52 JD |
977 | ret = consumer_send_status_msg(sock, ret_code); |
978 | if (ret < 0) { | |
979 | /* Somehow, the session daemon is not responding anymore. */ | |
980 | goto end_nosignal; | |
981 | } | |
982 | ||
9ce5646a MD |
983 | health_code_update(); |
984 | ||
15dc512a DG |
985 | /* Stop right now if no channel was found. */ |
986 | if (!channel) { | |
987 | goto end_nosignal; | |
988 | } | |
989 | ||
07b86b52 JD |
990 | /* |
991 | * This command should ONLY be issued for channel with streams set in | |
992 | * no monitor mode. | |
993 | */ | |
994 | assert(!channel->monitor); | |
995 | ||
996 | /* | |
997 | * The refcount should ALWAYS be 0 in the case of a channel in no | |
998 | * monitor mode. | |
999 | */ | |
1000 | assert(!uatomic_sub_return(&channel->refcount, 1)); | |
1001 | ||
1002 | consumer_del_channel(channel); | |
1003 | ||
1004 | goto end_nosignal; | |
1005 | } | |
fb83fe64 JD |
1006 | case LTTNG_CONSUMER_DISCARDED_EVENTS: |
1007 | { | |
1008 | uint64_t ret; | |
1009 | struct lttng_consumer_channel *channel; | |
1010 | uint64_t id = msg.u.discarded_events.session_id; | |
1011 | uint64_t key = msg.u.discarded_events.channel_key; | |
1012 | ||
e5742757 MD |
1013 | DBG("Kernel consumer discarded events command for session id %" |
1014 | PRIu64 ", channel key %" PRIu64, id, key); | |
1015 | ||
fb83fe64 JD |
1016 | channel = consumer_find_channel(key); |
1017 | if (!channel) { | |
1018 | ERR("Kernel consumer discarded events channel %" | |
1019 | PRIu64 " not found", key); | |
e5742757 MD |
1020 | ret = 0; |
1021 | } else { | |
1022 | ret = channel->discarded_events; | |
fb83fe64 JD |
1023 | } |
1024 | ||
fb83fe64 JD |
1025 | health_code_update(); |
1026 | ||
1027 | /* Send back returned value to session daemon */ | |
1028 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
1029 | if (ret < 0) { | |
1030 | PERROR("send discarded events"); | |
1031 | goto error_fatal; | |
1032 | } | |
1033 | ||
1034 | break; | |
1035 | } | |
1036 | case LTTNG_CONSUMER_LOST_PACKETS: | |
1037 | { | |
1038 | uint64_t ret; | |
1039 | struct lttng_consumer_channel *channel; | |
1040 | uint64_t id = msg.u.lost_packets.session_id; | |
1041 | uint64_t key = msg.u.lost_packets.channel_key; | |
1042 | ||
e5742757 MD |
1043 | DBG("Kernel consumer lost packets command for session id %" |
1044 | PRIu64 ", channel key %" PRIu64, id, key); | |
1045 | ||
fb83fe64 JD |
1046 | channel = consumer_find_channel(key); |
1047 | if (!channel) { | |
1048 | ERR("Kernel consumer lost packets channel %" | |
1049 | PRIu64 " not found", key); | |
e5742757 MD |
1050 | ret = 0; |
1051 | } else { | |
1052 | ret = channel->lost_packets; | |
fb83fe64 JD |
1053 | } |
1054 | ||
fb83fe64 JD |
1055 | health_code_update(); |
1056 | ||
1057 | /* Send back returned value to session daemon */ | |
1058 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
1059 | if (ret < 0) { | |
1060 | PERROR("send lost packets"); | |
1061 | goto error_fatal; | |
1062 | } | |
1063 | ||
1064 | break; | |
1065 | } | |
b3530820 JG |
1066 | case LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE: |
1067 | { | |
1068 | int channel_monitor_pipe; | |
1069 | ||
1070 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1071 | /* Successfully received the command's type. */ | |
1072 | ret = consumer_send_status_msg(sock, ret_code); | |
1073 | if (ret < 0) { | |
1074 | goto error_fatal; | |
1075 | } | |
1076 | ||
1077 | ret = lttcomm_recv_fds_unix_sock(sock, &channel_monitor_pipe, | |
1078 | 1); | |
1079 | if (ret != sizeof(channel_monitor_pipe)) { | |
1080 | ERR("Failed to receive channel monitor pipe"); | |
1081 | goto error_fatal; | |
1082 | } | |
1083 | ||
1084 | DBG("Received channel monitor pipe (%d)", channel_monitor_pipe); | |
1085 | ret = consumer_timer_thread_set_channel_monitor_pipe( | |
1086 | channel_monitor_pipe); | |
1087 | if (!ret) { | |
1088 | int flags; | |
1089 | ||
1090 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1091 | /* Set the pipe as non-blocking. */ | |
1092 | ret = fcntl(channel_monitor_pipe, F_GETFL, 0); | |
1093 | if (ret == -1) { | |
1094 | PERROR("fcntl get flags of the channel monitoring pipe"); | |
1095 | goto error_fatal; | |
1096 | } | |
1097 | flags = ret; | |
1098 | ||
1099 | ret = fcntl(channel_monitor_pipe, F_SETFL, | |
1100 | flags | O_NONBLOCK); | |
1101 | if (ret == -1) { | |
1102 | PERROR("fcntl set O_NONBLOCK flag of the channel monitoring pipe"); | |
1103 | goto error_fatal; | |
1104 | } | |
1105 | DBG("Channel monitor pipe set as non-blocking"); | |
1106 | } else { | |
1107 | ret_code = LTTCOMM_CONSUMERD_ALREADY_SET; | |
1108 | } | |
1109 | ret = consumer_send_status_msg(sock, ret_code); | |
1110 | if (ret < 0) { | |
1111 | goto error_fatal; | |
1112 | } | |
1113 | break; | |
1114 | } | |
3bd1e081 | 1115 | default: |
3f8e211f | 1116 | goto end_nosignal; |
3bd1e081 | 1117 | } |
3f8e211f | 1118 | |
3bd1e081 | 1119 | end_nosignal: |
b0b335c8 | 1120 | rcu_read_unlock(); |
4cbc1a04 DG |
1121 | |
1122 | /* | |
1123 | * Return 1 to indicate success since the 0 value can be a socket | |
1124 | * shutdown during the recv() or send() call. | |
1125 | */ | |
9ce5646a | 1126 | health_code_update(); |
4cbc1a04 | 1127 | return 1; |
1803a064 MD |
1128 | |
1129 | error_fatal: | |
1130 | rcu_read_unlock(); | |
1131 | /* This will issue a consumer stop. */ | |
1132 | return -1; | |
3bd1e081 | 1133 | } |
d41f73b7 | 1134 | |
309167d2 JD |
1135 | /* |
1136 | * Populate index values of a kernel stream. Values are set in big endian order. | |
1137 | * | |
1138 | * Return 0 on success or else a negative value. | |
1139 | */ | |
50adc264 | 1140 | static int get_index_values(struct ctf_packet_index *index, int infd) |
309167d2 JD |
1141 | { |
1142 | int ret; | |
1143 | ||
1144 | ret = kernctl_get_timestamp_begin(infd, &index->timestamp_begin); | |
1145 | if (ret < 0) { | |
1146 | PERROR("kernctl_get_timestamp_begin"); | |
1147 | goto error; | |
1148 | } | |
1149 | index->timestamp_begin = htobe64(index->timestamp_begin); | |
1150 | ||
1151 | ret = kernctl_get_timestamp_end(infd, &index->timestamp_end); | |
1152 | if (ret < 0) { | |
1153 | PERROR("kernctl_get_timestamp_end"); | |
1154 | goto error; | |
1155 | } | |
1156 | index->timestamp_end = htobe64(index->timestamp_end); | |
1157 | ||
1158 | ret = kernctl_get_events_discarded(infd, &index->events_discarded); | |
1159 | if (ret < 0) { | |
1160 | PERROR("kernctl_get_events_discarded"); | |
1161 | goto error; | |
1162 | } | |
1163 | index->events_discarded = htobe64(index->events_discarded); | |
1164 | ||
1165 | ret = kernctl_get_content_size(infd, &index->content_size); | |
1166 | if (ret < 0) { | |
1167 | PERROR("kernctl_get_content_size"); | |
1168 | goto error; | |
1169 | } | |
1170 | index->content_size = htobe64(index->content_size); | |
1171 | ||
1172 | ret = kernctl_get_packet_size(infd, &index->packet_size); | |
1173 | if (ret < 0) { | |
1174 | PERROR("kernctl_get_packet_size"); | |
1175 | goto error; | |
1176 | } | |
1177 | index->packet_size = htobe64(index->packet_size); | |
1178 | ||
1179 | ret = kernctl_get_stream_id(infd, &index->stream_id); | |
1180 | if (ret < 0) { | |
1181 | PERROR("kernctl_get_stream_id"); | |
1182 | goto error; | |
1183 | } | |
1184 | index->stream_id = htobe64(index->stream_id); | |
1185 | ||
234cd636 JD |
1186 | ret = kernctl_get_instance_id(infd, &index->stream_instance_id); |
1187 | if (ret < 0) { | |
f0b03c22 MD |
1188 | if (ret == -ENOTTY) { |
1189 | /* Command not implemented by lttng-modules. */ | |
1190 | index->stream_instance_id = -1ULL; | |
1191 | ret = 0; | |
1192 | } else { | |
1193 | PERROR("kernctl_get_instance_id"); | |
1194 | goto error; | |
1195 | } | |
234cd636 JD |
1196 | } |
1197 | index->stream_instance_id = htobe64(index->stream_instance_id); | |
1198 | ||
1199 | ret = kernctl_get_sequence_number(infd, &index->packet_seq_num); | |
1200 | if (ret < 0) { | |
f0b03c22 MD |
1201 | if (ret == -ENOTTY) { |
1202 | /* Command not implemented by lttng-modules. */ | |
1203 | index->packet_seq_num = -1ULL; | |
1204 | ret = 0; | |
1205 | } else { | |
1206 | PERROR("kernctl_get_sequence_number"); | |
1207 | goto error; | |
1208 | } | |
234cd636 JD |
1209 | } |
1210 | index->packet_seq_num = htobe64(index->packet_seq_num); | |
1211 | ||
309167d2 JD |
1212 | error: |
1213 | return ret; | |
1214 | } | |
94d49140 JD |
1215 | /* |
1216 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
1217 | * metadata thread can consumer them. | |
1218 | * | |
1219 | * Metadata stream lock MUST be acquired. | |
1220 | * | |
1221 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream | |
1222 | * is empty or a negative value on error. | |
1223 | */ | |
1224 | int lttng_kconsumer_sync_metadata(struct lttng_consumer_stream *metadata) | |
1225 | { | |
1226 | int ret; | |
1227 | ||
1228 | assert(metadata); | |
1229 | ||
1230 | ret = kernctl_buffer_flush(metadata->wait_fd); | |
1231 | if (ret < 0) { | |
1232 | ERR("Failed to flush kernel stream"); | |
1233 | goto end; | |
1234 | } | |
1235 | ||
1236 | ret = kernctl_snapshot(metadata->wait_fd); | |
1237 | if (ret < 0) { | |
32af2c95 | 1238 | if (ret != -EAGAIN) { |
94d49140 JD |
1239 | ERR("Sync metadata, taking kernel snapshot failed."); |
1240 | goto end; | |
1241 | } | |
1242 | DBG("Sync metadata, no new kernel metadata"); | |
1243 | /* No new metadata, exit. */ | |
1244 | ret = ENODATA; | |
1245 | goto end; | |
1246 | } | |
1247 | ||
1248 | end: | |
1249 | return ret; | |
1250 | } | |
309167d2 | 1251 | |
fb83fe64 JD |
1252 | static |
1253 | int update_stream_stats(struct lttng_consumer_stream *stream) | |
1254 | { | |
1255 | int ret; | |
1256 | uint64_t seq, discarded; | |
1257 | ||
1258 | ret = kernctl_get_sequence_number(stream->wait_fd, &seq); | |
1259 | if (ret < 0) { | |
f0b03c22 MD |
1260 | if (ret == -ENOTTY) { |
1261 | /* Command not implemented by lttng-modules. */ | |
1262 | seq = -1ULL; | |
1263 | ret = 0; | |
1264 | } else { | |
1265 | PERROR("kernctl_get_sequence_number"); | |
1266 | goto end; | |
1267 | } | |
fb83fe64 JD |
1268 | } |
1269 | ||
1270 | /* | |
1271 | * Start the sequence when we extract the first packet in case we don't | |
1272 | * start at 0 (for example if a consumer is not connected to the | |
1273 | * session immediately after the beginning). | |
1274 | */ | |
1275 | if (stream->last_sequence_number == -1ULL) { | |
1276 | stream->last_sequence_number = seq; | |
1277 | } else if (seq > stream->last_sequence_number) { | |
1278 | stream->chan->lost_packets += seq - | |
1279 | stream->last_sequence_number - 1; | |
1280 | } else { | |
1281 | /* seq <= last_sequence_number */ | |
1282 | ERR("Sequence number inconsistent : prev = %" PRIu64 | |
1283 | ", current = %" PRIu64, | |
1284 | stream->last_sequence_number, seq); | |
1285 | ret = -1; | |
1286 | goto end; | |
1287 | } | |
1288 | stream->last_sequence_number = seq; | |
1289 | ||
1290 | ret = kernctl_get_events_discarded(stream->wait_fd, &discarded); | |
1291 | if (ret < 0) { | |
1292 | PERROR("kernctl_get_events_discarded"); | |
1293 | goto end; | |
1294 | } | |
1295 | if (discarded < stream->last_discarded_events) { | |
1296 | /* | |
83f4233d MJ |
1297 | * Overflow has occurred. We assume only one wrap-around |
1298 | * has occurred. | |
fb83fe64 JD |
1299 | */ |
1300 | stream->chan->discarded_events += (1ULL << (CAA_BITS_PER_LONG - 1)) - | |
1301 | stream->last_discarded_events + discarded; | |
1302 | } else { | |
1303 | stream->chan->discarded_events += discarded - | |
1304 | stream->last_discarded_events; | |
1305 | } | |
1306 | stream->last_discarded_events = discarded; | |
1307 | ret = 0; | |
1308 | ||
1309 | end: | |
1310 | return ret; | |
1311 | } | |
1312 | ||
93ec662e JD |
1313 | /* |
1314 | * Check if the local version of the metadata stream matches with the version | |
1315 | * of the metadata stream in the kernel. If it was updated, set the reset flag | |
1316 | * on the stream. | |
1317 | */ | |
1318 | static | |
1319 | int metadata_stream_check_version(int infd, struct lttng_consumer_stream *stream) | |
1320 | { | |
1321 | int ret; | |
1322 | uint64_t cur_version; | |
1323 | ||
1324 | ret = kernctl_get_metadata_version(infd, &cur_version); | |
1325 | if (ret < 0) { | |
f0b03c22 MD |
1326 | if (ret == -ENOTTY) { |
1327 | /* | |
1328 | * LTTng-modules does not implement this | |
1329 | * command. | |
1330 | */ | |
1331 | ret = 0; | |
1332 | goto end; | |
1333 | } | |
93ec662e JD |
1334 | ERR("Failed to get the metadata version"); |
1335 | goto end; | |
1336 | } | |
1337 | ||
1338 | if (stream->metadata_version == cur_version) { | |
1339 | ret = 0; | |
1340 | goto end; | |
1341 | } | |
1342 | ||
1343 | DBG("New metadata version detected"); | |
1344 | stream->metadata_version = cur_version; | |
1345 | stream->reset_metadata_flag = 1; | |
1346 | ret = 0; | |
1347 | ||
1348 | end: | |
1349 | return ret; | |
1350 | } | |
1351 | ||
d41f73b7 MD |
1352 | /* |
1353 | * Consume data on a file descriptor and write it on a trace file. | |
1354 | */ | |
4078b776 | 1355 | ssize_t lttng_kconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
1356 | struct lttng_consumer_local_data *ctx) |
1357 | { | |
1d4dfdef | 1358 | unsigned long len, subbuf_size, padding; |
1c20f0e2 | 1359 | int err, write_index = 1; |
4078b776 | 1360 | ssize_t ret = 0; |
d41f73b7 | 1361 | int infd = stream->wait_fd; |
50adc264 | 1362 | struct ctf_packet_index index; |
d41f73b7 MD |
1363 | |
1364 | DBG("In read_subbuffer (infd : %d)", infd); | |
309167d2 | 1365 | |
d41f73b7 MD |
1366 | /* Get the next subbuffer */ |
1367 | err = kernctl_get_next_subbuf(infd); | |
1368 | if (err != 0) { | |
d41f73b7 MD |
1369 | /* |
1370 | * This is a debug message even for single-threaded consumer, | |
1371 | * because poll() have more relaxed criterions than get subbuf, | |
1372 | * so get_subbuf may fail for short race windows where poll() | |
1373 | * would issue wakeups. | |
1374 | */ | |
1375 | DBG("Reserving sub buffer failed (everything is normal, " | |
1376 | "it is due to concurrency)"); | |
32af2c95 | 1377 | ret = err; |
d41f73b7 MD |
1378 | goto end; |
1379 | } | |
1380 | ||
1d4dfdef DG |
1381 | /* Get the full subbuffer size including padding */ |
1382 | err = kernctl_get_padded_subbuf_size(infd, &len); | |
1383 | if (err != 0) { | |
5a510c9f | 1384 | PERROR("Getting sub-buffer len failed."); |
8265f19e MD |
1385 | err = kernctl_put_subbuf(infd); |
1386 | if (err != 0) { | |
32af2c95 | 1387 | if (err == -EFAULT) { |
5a510c9f | 1388 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1389 | } else if (err == -EIO) { |
8265f19e | 1390 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1391 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e | 1392 | } |
32af2c95 | 1393 | ret = err; |
8265f19e MD |
1394 | goto end; |
1395 | } | |
32af2c95 | 1396 | ret = err; |
1d4dfdef DG |
1397 | goto end; |
1398 | } | |
1399 | ||
1c20f0e2 | 1400 | if (!stream->metadata_flag) { |
309167d2 JD |
1401 | ret = get_index_values(&index, infd); |
1402 | if (ret < 0) { | |
8265f19e MD |
1403 | err = kernctl_put_subbuf(infd); |
1404 | if (err != 0) { | |
32af2c95 | 1405 | if (err == -EFAULT) { |
5a510c9f | 1406 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1407 | } else if (err == -EIO) { |
8265f19e | 1408 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1409 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e | 1410 | } |
32af2c95 | 1411 | ret = err; |
8265f19e MD |
1412 | goto end; |
1413 | } | |
309167d2 JD |
1414 | goto end; |
1415 | } | |
fb83fe64 JD |
1416 | ret = update_stream_stats(stream); |
1417 | if (ret < 0) { | |
7b87473d MD |
1418 | err = kernctl_put_subbuf(infd); |
1419 | if (err != 0) { | |
1420 | if (err == -EFAULT) { | |
1421 | PERROR("Error in unreserving sub buffer\n"); | |
1422 | } else if (err == -EIO) { | |
1423 | /* Should never happen with newer LTTng versions */ | |
1424 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
1425 | } | |
1426 | ret = err; | |
1427 | goto end; | |
1428 | } | |
fb83fe64 JD |
1429 | goto end; |
1430 | } | |
1c20f0e2 JD |
1431 | } else { |
1432 | write_index = 0; | |
93ec662e JD |
1433 | ret = metadata_stream_check_version(infd, stream); |
1434 | if (ret < 0) { | |
7b87473d MD |
1435 | err = kernctl_put_subbuf(infd); |
1436 | if (err != 0) { | |
1437 | if (err == -EFAULT) { | |
1438 | PERROR("Error in unreserving sub buffer\n"); | |
1439 | } else if (err == -EIO) { | |
1440 | /* Should never happen with newer LTTng versions */ | |
1441 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
1442 | } | |
1443 | ret = err; | |
1444 | goto end; | |
1445 | } | |
93ec662e JD |
1446 | goto end; |
1447 | } | |
309167d2 JD |
1448 | } |
1449 | ||
ffe60014 | 1450 | switch (stream->chan->output) { |
07b86b52 | 1451 | case CONSUMER_CHANNEL_SPLICE: |
1d4dfdef DG |
1452 | /* |
1453 | * XXX: The lttng-modules splice "actor" does not handle copying | |
1454 | * partial pages hence only using the subbuffer size without the | |
1455 | * padding makes the splice fail. | |
1456 | */ | |
1457 | subbuf_size = len; | |
1458 | padding = 0; | |
1459 | ||
1460 | /* splice the subbuffer to the tracefile */ | |
91dfef6e | 1461 | ret = lttng_consumer_on_read_subbuffer_splice(ctx, stream, subbuf_size, |
309167d2 | 1462 | padding, &index); |
91dfef6e DG |
1463 | /* |
1464 | * XXX: Splice does not support network streaming so the return value | |
1465 | * is simply checked against subbuf_size and not like the mmap() op. | |
1466 | */ | |
1d4dfdef DG |
1467 | if (ret != subbuf_size) { |
1468 | /* | |
1469 | * display the error but continue processing to try | |
1470 | * to release the subbuffer | |
1471 | */ | |
1472 | ERR("Error splicing to tracefile (ret: %zd != len: %lu)", | |
1473 | ret, subbuf_size); | |
309167d2 | 1474 | write_index = 0; |
1d4dfdef DG |
1475 | } |
1476 | break; | |
07b86b52 | 1477 | case CONSUMER_CHANNEL_MMAP: |
1d4dfdef DG |
1478 | /* Get subbuffer size without padding */ |
1479 | err = kernctl_get_subbuf_size(infd, &subbuf_size); | |
1480 | if (err != 0) { | |
5a510c9f | 1481 | PERROR("Getting sub-buffer len failed."); |
8265f19e MD |
1482 | err = kernctl_put_subbuf(infd); |
1483 | if (err != 0) { | |
32af2c95 | 1484 | if (err == -EFAULT) { |
5a510c9f | 1485 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1486 | } else if (err == -EIO) { |
8265f19e | 1487 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1488 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e | 1489 | } |
32af2c95 | 1490 | ret = err; |
8265f19e MD |
1491 | goto end; |
1492 | } | |
32af2c95 | 1493 | ret = err; |
1d4dfdef DG |
1494 | goto end; |
1495 | } | |
47e81c02 | 1496 | |
1d4dfdef DG |
1497 | /* Make sure the tracer is not gone mad on us! */ |
1498 | assert(len >= subbuf_size); | |
1499 | ||
1500 | padding = len - subbuf_size; | |
1501 | ||
1502 | /* write the subbuffer to the tracefile */ | |
91dfef6e | 1503 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, |
309167d2 | 1504 | padding, &index); |
91dfef6e DG |
1505 | /* |
1506 | * The mmap operation should write subbuf_size amount of data when | |
1507 | * network streaming or the full padding (len) size when we are _not_ | |
1508 | * streaming. | |
1509 | */ | |
d88aee68 DG |
1510 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
1511 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
1d4dfdef | 1512 | /* |
91dfef6e | 1513 | * Display the error but continue processing to try to release the |
2336629e DG |
1514 | * subbuffer. This is a DBG statement since this is possible to |
1515 | * happen without being a critical error. | |
1d4dfdef | 1516 | */ |
2336629e | 1517 | DBG("Error writing to tracefile " |
91dfef6e DG |
1518 | "(ret: %zd != len: %lu != subbuf_size: %lu)", |
1519 | ret, len, subbuf_size); | |
309167d2 | 1520 | write_index = 0; |
1d4dfdef DG |
1521 | } |
1522 | break; | |
1523 | default: | |
1524 | ERR("Unknown output method"); | |
56591bac | 1525 | ret = -EPERM; |
d41f73b7 MD |
1526 | } |
1527 | ||
1528 | err = kernctl_put_next_subbuf(infd); | |
1529 | if (err != 0) { | |
32af2c95 | 1530 | if (err == -EFAULT) { |
5a510c9f | 1531 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1532 | } else if (err == -EIO) { |
d41f73b7 | 1533 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1534 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
d41f73b7 | 1535 | } |
32af2c95 | 1536 | ret = err; |
d41f73b7 MD |
1537 | goto end; |
1538 | } | |
1539 | ||
309167d2 | 1540 | /* Write index if needed. */ |
1c20f0e2 JD |
1541 | if (!write_index) { |
1542 | goto end; | |
1543 | } | |
1544 | ||
94d49140 JD |
1545 | if (stream->chan->live_timer_interval && !stream->metadata_flag) { |
1546 | /* | |
1547 | * In live, block until all the metadata is sent. | |
1548 | */ | |
c585821b MD |
1549 | pthread_mutex_lock(&stream->metadata_timer_lock); |
1550 | assert(!stream->missed_metadata_flush); | |
1551 | stream->waiting_on_metadata = true; | |
1552 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1553 | ||
94d49140 | 1554 | err = consumer_stream_sync_metadata(ctx, stream->session_id); |
c585821b MD |
1555 | |
1556 | pthread_mutex_lock(&stream->metadata_timer_lock); | |
1557 | stream->waiting_on_metadata = false; | |
1558 | if (stream->missed_metadata_flush) { | |
1559 | stream->missed_metadata_flush = false; | |
1560 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1561 | (void) consumer_flush_kernel_index(stream); | |
1562 | } else { | |
1563 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1564 | } | |
94d49140 JD |
1565 | if (err < 0) { |
1566 | goto end; | |
1567 | } | |
1568 | } | |
1569 | ||
1c20f0e2 JD |
1570 | err = consumer_stream_write_index(stream, &index); |
1571 | if (err < 0) { | |
1572 | goto end; | |
309167d2 JD |
1573 | } |
1574 | ||
d41f73b7 MD |
1575 | end: |
1576 | return ret; | |
1577 | } | |
1578 | ||
1579 | int lttng_kconsumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
1580 | { | |
1581 | int ret; | |
ffe60014 DG |
1582 | |
1583 | assert(stream); | |
1584 | ||
2bba9e53 DG |
1585 | /* |
1586 | * Don't create anything if this is set for streaming or should not be | |
1587 | * monitored. | |
1588 | */ | |
1589 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { | |
fe4477ee JD |
1590 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
1591 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
309167d2 | 1592 | stream->uid, stream->gid, NULL); |
fe4477ee JD |
1593 | if (ret < 0) { |
1594 | goto error; | |
1595 | } | |
1596 | stream->out_fd = ret; | |
1597 | stream->tracefile_size_current = 0; | |
309167d2 JD |
1598 | |
1599 | if (!stream->metadata_flag) { | |
f8f3885c MD |
1600 | struct lttng_index_file *index_file; |
1601 | ||
1602 | index_file = lttng_index_file_create(stream->chan->pathname, | |
309167d2 JD |
1603 | stream->name, stream->uid, stream->gid, |
1604 | stream->chan->tracefile_size, | |
f8f3885c MD |
1605 | stream->tracefile_count_current, |
1606 | CTF_INDEX_MAJOR, CTF_INDEX_MINOR); | |
1607 | if (!index_file) { | |
309167d2 JD |
1608 | goto error; |
1609 | } | |
1b47ae58 | 1610 | assert(!stream->index_file); |
f8f3885c | 1611 | stream->index_file = index_file; |
309167d2 | 1612 | } |
ffe60014 | 1613 | } |
d41f73b7 | 1614 | |
d41f73b7 MD |
1615 | if (stream->output == LTTNG_EVENT_MMAP) { |
1616 | /* get the len of the mmap region */ | |
1617 | unsigned long mmap_len; | |
1618 | ||
1619 | ret = kernctl_get_mmap_len(stream->wait_fd, &mmap_len); | |
1620 | if (ret != 0) { | |
ffe60014 | 1621 | PERROR("kernctl_get_mmap_len"); |
d41f73b7 MD |
1622 | goto error_close_fd; |
1623 | } | |
1624 | stream->mmap_len = (size_t) mmap_len; | |
1625 | ||
ffe60014 DG |
1626 | stream->mmap_base = mmap(NULL, stream->mmap_len, PROT_READ, |
1627 | MAP_PRIVATE, stream->wait_fd, 0); | |
d41f73b7 | 1628 | if (stream->mmap_base == MAP_FAILED) { |
ffe60014 | 1629 | PERROR("Error mmaping"); |
d41f73b7 MD |
1630 | ret = -1; |
1631 | goto error_close_fd; | |
1632 | } | |
1633 | } | |
1634 | ||
1635 | /* we return 0 to let the library handle the FD internally */ | |
1636 | return 0; | |
1637 | ||
1638 | error_close_fd: | |
2f225ce2 | 1639 | if (stream->out_fd >= 0) { |
d41f73b7 MD |
1640 | int err; |
1641 | ||
1642 | err = close(stream->out_fd); | |
1643 | assert(!err); | |
2f225ce2 | 1644 | stream->out_fd = -1; |
d41f73b7 MD |
1645 | } |
1646 | error: | |
1647 | return ret; | |
1648 | } | |
1649 | ||
ca22feea DG |
1650 | /* |
1651 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
1652 | * stream. Consumer data lock MUST be acquired before calling this function |
1653 | * and the stream lock. | |
ca22feea | 1654 | * |
6d805429 | 1655 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
1656 | * data is available for trace viewer reading. |
1657 | */ | |
6d805429 | 1658 | int lttng_kconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
1659 | { |
1660 | int ret; | |
1661 | ||
1662 | assert(stream); | |
1663 | ||
873b9e9a MD |
1664 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
1665 | ret = 0; | |
1666 | goto end; | |
1667 | } | |
1668 | ||
ca22feea DG |
1669 | ret = kernctl_get_next_subbuf(stream->wait_fd); |
1670 | if (ret == 0) { | |
1671 | /* There is still data so let's put back this subbuffer. */ | |
1672 | ret = kernctl_put_subbuf(stream->wait_fd); | |
1673 | assert(ret == 0); | |
6d805429 | 1674 | ret = 1; /* Data is pending */ |
4e9a4686 | 1675 | goto end; |
ca22feea DG |
1676 | } |
1677 | ||
6d805429 DG |
1678 | /* Data is NOT pending and ready to be read. */ |
1679 | ret = 0; | |
ca22feea | 1680 | |
6efae65e DG |
1681 | end: |
1682 | return ret; | |
ca22feea | 1683 | } |