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