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) { |
923333cd | 153 | unsigned long consumed_pos, produced_pos; |
9ce5646a MD |
154 | |
155 | health_code_update(); | |
156 | ||
07b86b52 JD |
157 | /* |
158 | * Lock stream because we are about to change its state. | |
159 | */ | |
160 | pthread_mutex_lock(&stream->lock); | |
161 | ||
29decac3 DG |
162 | /* |
163 | * Assign the received relayd ID so we can use it for streaming. The streams | |
164 | * are not visible to anyone so this is OK to change it. | |
165 | */ | |
07b86b52 JD |
166 | stream->net_seq_idx = relayd_id; |
167 | channel->relayd_id = relayd_id; | |
168 | if (relayd_id != (uint64_t) -1ULL) { | |
10a50311 | 169 | ret = consumer_send_relayd_stream(stream, path); |
07b86b52 JD |
170 | if (ret < 0) { |
171 | ERR("sending stream to relayd"); | |
172 | goto end_unlock; | |
173 | } | |
07b86b52 JD |
174 | } else { |
175 | ret = utils_create_stream_file(path, stream->name, | |
10a50311 JD |
176 | stream->chan->tracefile_size, |
177 | stream->tracefile_count_current, | |
309167d2 | 178 | stream->uid, stream->gid, NULL); |
07b86b52 JD |
179 | if (ret < 0) { |
180 | ERR("utils_create_stream_file"); | |
181 | goto end_unlock; | |
182 | } | |
183 | ||
184 | stream->out_fd = ret; | |
185 | stream->tracefile_size_current = 0; | |
186 | ||
81ea21bf MD |
187 | DBG("Kernel consumer snapshot stream %s/%s (%" PRIu64 ")", |
188 | path, stream->name, stream->key); | |
07b86b52 | 189 | } |
601262d6 JD |
190 | if (relayd_id != -1ULL) { |
191 | ret = consumer_send_relayd_streams_sent(relayd_id); | |
192 | if (ret < 0) { | |
193 | ERR("sending streams sent to relayd"); | |
194 | goto end_unlock; | |
195 | } | |
1bf914e0 | 196 | channel->streams_sent_to_relayd = true; |
a4baae1b | 197 | } |
07b86b52 | 198 | |
213643b9 | 199 | ret = kernctl_buffer_flush_empty(stream->wait_fd); |
07b86b52 | 200 | if (ret < 0) { |
213643b9 MD |
201 | /* |
202 | * Doing a buffer flush which does not take into | |
203 | * account empty packets. This is not perfect | |
204 | * for stream intersection, but required as a | |
205 | * fall-back when "flush_empty" is not | |
206 | * implemented by lttng-modules. | |
207 | */ | |
208 | ret = kernctl_buffer_flush(stream->wait_fd); | |
209 | if (ret < 0) { | |
210 | ERR("Failed to flush kernel stream"); | |
211 | goto end_unlock; | |
212 | } | |
07b86b52 JD |
213 | goto end_unlock; |
214 | } | |
215 | ||
216 | ret = lttng_kconsumer_take_snapshot(stream); | |
217 | if (ret < 0) { | |
218 | ERR("Taking kernel snapshot"); | |
219 | goto end_unlock; | |
220 | } | |
221 | ||
222 | ret = lttng_kconsumer_get_produced_snapshot(stream, &produced_pos); | |
223 | if (ret < 0) { | |
224 | ERR("Produced kernel snapshot position"); | |
225 | goto end_unlock; | |
226 | } | |
227 | ||
228 | ret = lttng_kconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
229 | if (ret < 0) { | |
230 | ERR("Consumerd kernel snapshot position"); | |
231 | goto end_unlock; | |
232 | } | |
233 | ||
234 | if (stream->max_sb_size == 0) { | |
235 | ret = kernctl_get_max_subbuf_size(stream->wait_fd, | |
236 | &stream->max_sb_size); | |
237 | if (ret < 0) { | |
238 | ERR("Getting kernel max_sb_size"); | |
239 | goto end_unlock; | |
240 | } | |
241 | } | |
242 | ||
d07ceecd MD |
243 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
244 | produced_pos, nb_packets_per_stream, | |
245 | stream->max_sb_size); | |
5c786ded | 246 | |
07b86b52 JD |
247 | while (consumed_pos < produced_pos) { |
248 | ssize_t read_len; | |
249 | unsigned long len, padded_len; | |
250 | ||
9ce5646a MD |
251 | health_code_update(); |
252 | ||
07b86b52 JD |
253 | DBG("Kernel consumer taking snapshot at pos %lu", consumed_pos); |
254 | ||
255 | ret = kernctl_get_subbuf(stream->wait_fd, &consumed_pos); | |
256 | if (ret < 0) { | |
32af2c95 | 257 | if (ret != -EAGAIN) { |
07b86b52 JD |
258 | PERROR("kernctl_get_subbuf snapshot"); |
259 | goto end_unlock; | |
260 | } | |
261 | DBG("Kernel consumer get subbuf failed. Skipping it."); | |
262 | consumed_pos += stream->max_sb_size; | |
2947da29 | 263 | stream->chan->lost_packets++; |
07b86b52 JD |
264 | continue; |
265 | } | |
266 | ||
267 | ret = kernctl_get_subbuf_size(stream->wait_fd, &len); | |
268 | if (ret < 0) { | |
269 | ERR("Snapshot kernctl_get_subbuf_size"); | |
29decac3 | 270 | goto error_put_subbuf; |
07b86b52 JD |
271 | } |
272 | ||
273 | ret = kernctl_get_padded_subbuf_size(stream->wait_fd, &padded_len); | |
274 | if (ret < 0) { | |
275 | ERR("Snapshot kernctl_get_padded_subbuf_size"); | |
29decac3 | 276 | goto error_put_subbuf; |
07b86b52 JD |
277 | } |
278 | ||
279 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
309167d2 | 280 | padded_len - len, NULL); |
07b86b52 | 281 | /* |
29decac3 DG |
282 | * We write the padded len in local tracefiles but the data len |
283 | * when using a relay. Display the error but continue processing | |
284 | * to try to release the subbuffer. | |
07b86b52 JD |
285 | */ |
286 | if (relayd_id != (uint64_t) -1ULL) { | |
287 | if (read_len != len) { | |
288 | ERR("Error sending to the relay (ret: %zd != len: %lu)", | |
289 | read_len, len); | |
290 | } | |
291 | } else { | |
292 | if (read_len != padded_len) { | |
293 | ERR("Error writing to tracefile (ret: %zd != len: %lu)", | |
294 | read_len, padded_len); | |
295 | } | |
296 | } | |
297 | ||
298 | ret = kernctl_put_subbuf(stream->wait_fd); | |
299 | if (ret < 0) { | |
300 | ERR("Snapshot kernctl_put_subbuf"); | |
301 | goto end_unlock; | |
302 | } | |
303 | consumed_pos += stream->max_sb_size; | |
304 | } | |
305 | ||
306 | if (relayd_id == (uint64_t) -1ULL) { | |
fdf9986c MD |
307 | if (stream->out_fd >= 0) { |
308 | ret = close(stream->out_fd); | |
309 | if (ret < 0) { | |
310 | PERROR("Kernel consumer snapshot close out_fd"); | |
311 | goto end_unlock; | |
312 | } | |
313 | stream->out_fd = -1; | |
07b86b52 | 314 | } |
07b86b52 JD |
315 | } else { |
316 | close_relayd_stream(stream); | |
317 | stream->net_seq_idx = (uint64_t) -1ULL; | |
318 | } | |
319 | pthread_mutex_unlock(&stream->lock); | |
320 | } | |
321 | ||
322 | /* All good! */ | |
323 | ret = 0; | |
324 | goto end; | |
325 | ||
29decac3 DG |
326 | error_put_subbuf: |
327 | ret = kernctl_put_subbuf(stream->wait_fd); | |
328 | if (ret < 0) { | |
329 | ERR("Snapshot kernctl_put_subbuf error path"); | |
330 | } | |
07b86b52 JD |
331 | end_unlock: |
332 | pthread_mutex_unlock(&stream->lock); | |
333 | end: | |
334 | rcu_read_unlock(); | |
335 | return ret; | |
336 | } | |
337 | ||
338 | /* | |
339 | * Read the whole metadata available for a snapshot. | |
340 | * | |
341 | * Returns 0 on success, < 0 on error | |
342 | */ | |
343 | int lttng_kconsumer_snapshot_metadata(uint64_t key, char *path, | |
e2039c7a | 344 | uint64_t relayd_id, struct lttng_consumer_local_data *ctx) |
07b86b52 | 345 | { |
d771f832 DG |
346 | int ret, use_relayd = 0; |
347 | ssize_t ret_read; | |
07b86b52 JD |
348 | struct lttng_consumer_channel *metadata_channel; |
349 | struct lttng_consumer_stream *metadata_stream; | |
d771f832 DG |
350 | |
351 | assert(ctx); | |
07b86b52 JD |
352 | |
353 | DBG("Kernel consumer snapshot metadata with key %" PRIu64 " at path %s", | |
354 | key, path); | |
355 | ||
356 | rcu_read_lock(); | |
357 | ||
358 | metadata_channel = consumer_find_channel(key); | |
359 | if (!metadata_channel) { | |
d771f832 | 360 | ERR("Kernel snapshot metadata not found for key %" PRIu64, key); |
07b86b52 | 361 | ret = -1; |
d771f832 | 362 | goto error; |
07b86b52 JD |
363 | } |
364 | ||
365 | metadata_stream = metadata_channel->metadata_stream; | |
366 | assert(metadata_stream); | |
367 | ||
d771f832 | 368 | /* Flag once that we have a valid relayd for the stream. */ |
e2039c7a | 369 | if (relayd_id != (uint64_t) -1ULL) { |
d771f832 DG |
370 | use_relayd = 1; |
371 | } | |
372 | ||
373 | if (use_relayd) { | |
10a50311 | 374 | ret = consumer_send_relayd_stream(metadata_stream, path); |
e2039c7a | 375 | if (ret < 0) { |
d771f832 | 376 | goto error; |
e2039c7a | 377 | } |
e2039c7a JD |
378 | } else { |
379 | ret = utils_create_stream_file(path, metadata_stream->name, | |
380 | metadata_stream->chan->tracefile_size, | |
381 | metadata_stream->tracefile_count_current, | |
309167d2 | 382 | metadata_stream->uid, metadata_stream->gid, NULL); |
e2039c7a | 383 | if (ret < 0) { |
d771f832 | 384 | goto error; |
e2039c7a JD |
385 | } |
386 | metadata_stream->out_fd = ret; | |
07b86b52 | 387 | } |
07b86b52 | 388 | |
d771f832 | 389 | do { |
9ce5646a MD |
390 | health_code_update(); |
391 | ||
d771f832 DG |
392 | ret_read = lttng_kconsumer_read_subbuffer(metadata_stream, ctx); |
393 | if (ret_read < 0) { | |
56591bac | 394 | if (ret_read != -EAGAIN) { |
6a00837f | 395 | ERR("Kernel snapshot reading metadata subbuffer (ret: %zd)", |
d771f832 DG |
396 | ret_read); |
397 | goto error; | |
07b86b52 | 398 | } |
d771f832 | 399 | /* ret_read is negative at this point so we will exit the loop. */ |
07b86b52 JD |
400 | continue; |
401 | } | |
d771f832 | 402 | } while (ret_read >= 0); |
07b86b52 | 403 | |
d771f832 DG |
404 | if (use_relayd) { |
405 | close_relayd_stream(metadata_stream); | |
406 | metadata_stream->net_seq_idx = (uint64_t) -1ULL; | |
407 | } else { | |
fdf9986c MD |
408 | if (metadata_stream->out_fd >= 0) { |
409 | ret = close(metadata_stream->out_fd); | |
410 | if (ret < 0) { | |
411 | PERROR("Kernel consumer snapshot metadata close out_fd"); | |
412 | /* | |
413 | * Don't go on error here since the snapshot was successful at this | |
414 | * point but somehow the close failed. | |
415 | */ | |
416 | } | |
417 | metadata_stream->out_fd = -1; | |
e2039c7a | 418 | } |
e2039c7a JD |
419 | } |
420 | ||
07b86b52 | 421 | ret = 0; |
d771f832 | 422 | |
cf53a8a6 JD |
423 | cds_list_del(&metadata_stream->send_node); |
424 | consumer_stream_destroy(metadata_stream, NULL); | |
425 | metadata_channel->metadata_stream = NULL; | |
d771f832 | 426 | error: |
07b86b52 JD |
427 | rcu_read_unlock(); |
428 | return ret; | |
429 | } | |
430 | ||
1803a064 MD |
431 | /* |
432 | * Receive command from session daemon and process it. | |
433 | * | |
434 | * Return 1 on success else a negative value or 0. | |
435 | */ | |
3bd1e081 MD |
436 | int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
437 | int sock, struct pollfd *consumer_sockpoll) | |
438 | { | |
439 | ssize_t ret; | |
0c759fc9 | 440 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 MD |
441 | struct lttcomm_consumer_msg msg; |
442 | ||
9ce5646a MD |
443 | health_code_update(); |
444 | ||
3bd1e081 MD |
445 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
446 | if (ret != sizeof(msg)) { | |
1803a064 | 447 | if (ret > 0) { |
c6857fcf | 448 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
1803a064 MD |
449 | ret = -1; |
450 | } | |
3bd1e081 MD |
451 | return ret; |
452 | } | |
9ce5646a MD |
453 | |
454 | health_code_update(); | |
455 | ||
84382d49 MD |
456 | /* Deprecated command */ |
457 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 458 | |
9ce5646a MD |
459 | health_code_update(); |
460 | ||
b0b335c8 MD |
461 | /* relayd needs RCU read-side protection */ |
462 | rcu_read_lock(); | |
463 | ||
3bd1e081 | 464 | switch (msg.cmd_type) { |
00e2e675 DG |
465 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
466 | { | |
f50f23d9 | 467 | /* Session daemon status message are handled in the following call. */ |
7735ef9e DG |
468 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
469 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, | |
d3e2ba59 JD |
470 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
471 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
472 | goto end_nosignal; |
473 | } | |
3bd1e081 MD |
474 | case LTTNG_CONSUMER_ADD_CHANNEL: |
475 | { | |
476 | struct lttng_consumer_channel *new_channel; | |
e43c41c5 | 477 | int ret_recv; |
3bd1e081 | 478 | |
9ce5646a MD |
479 | health_code_update(); |
480 | ||
f50f23d9 DG |
481 | /* First send a status message before receiving the fds. */ |
482 | ret = consumer_send_status_msg(sock, ret_code); | |
483 | if (ret < 0) { | |
484 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 485 | goto error_fatal; |
f50f23d9 | 486 | } |
9ce5646a MD |
487 | |
488 | health_code_update(); | |
489 | ||
d88aee68 | 490 | DBG("consumer_add_channel %" PRIu64, msg.u.channel.channel_key); |
3bd1e081 | 491 | new_channel = consumer_allocate_channel(msg.u.channel.channel_key, |
ffe60014 DG |
492 | msg.u.channel.session_id, msg.u.channel.pathname, |
493 | msg.u.channel.name, msg.u.channel.uid, msg.u.channel.gid, | |
1624d5b7 JD |
494 | msg.u.channel.relayd_id, msg.u.channel.output, |
495 | msg.u.channel.tracefile_size, | |
1950109e | 496 | msg.u.channel.tracefile_count, 0, |
ecc48a90 | 497 | msg.u.channel.monitor, |
d7ba1388 | 498 | msg.u.channel.live_timer_interval, |
3d071855 | 499 | NULL, NULL); |
3bd1e081 | 500 | if (new_channel == NULL) { |
f73fabfd | 501 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
3bd1e081 MD |
502 | goto end_nosignal; |
503 | } | |
ffe60014 | 504 | new_channel->nb_init_stream_left = msg.u.channel.nb_init_streams; |
95a1109b JD |
505 | switch (msg.u.channel.output) { |
506 | case LTTNG_EVENT_SPLICE: | |
507 | new_channel->output = CONSUMER_CHANNEL_SPLICE; | |
508 | break; | |
509 | case LTTNG_EVENT_MMAP: | |
510 | new_channel->output = CONSUMER_CHANNEL_MMAP; | |
511 | break; | |
512 | default: | |
513 | ERR("Channel output unknown %d", msg.u.channel.output); | |
514 | goto end_nosignal; | |
515 | } | |
ffe60014 DG |
516 | |
517 | /* Translate and save channel type. */ | |
518 | switch (msg.u.channel.type) { | |
519 | case CONSUMER_CHANNEL_TYPE_DATA: | |
520 | case CONSUMER_CHANNEL_TYPE_METADATA: | |
521 | new_channel->type = msg.u.channel.type; | |
522 | break; | |
523 | default: | |
524 | assert(0); | |
525 | goto end_nosignal; | |
526 | }; | |
527 | ||
9ce5646a MD |
528 | health_code_update(); |
529 | ||
3bd1e081 | 530 | if (ctx->on_recv_channel != NULL) { |
e43c41c5 JD |
531 | ret_recv = ctx->on_recv_channel(new_channel); |
532 | if (ret_recv == 0) { | |
533 | ret = consumer_add_channel(new_channel, ctx); | |
534 | } else if (ret_recv < 0) { | |
3bd1e081 MD |
535 | goto end_nosignal; |
536 | } | |
537 | } else { | |
e43c41c5 | 538 | ret = consumer_add_channel(new_channel, ctx); |
3bd1e081 | 539 | } |
e9404c27 JG |
540 | if (msg.u.channel.type == CONSUMER_CHANNEL_TYPE_DATA && !ret) { |
541 | int monitor_start_ret; | |
542 | ||
543 | DBG("Consumer starting monitor timer"); | |
94d49140 JD |
544 | consumer_timer_live_start(new_channel, |
545 | msg.u.channel.live_timer_interval); | |
e9404c27 JG |
546 | monitor_start_ret = consumer_timer_monitor_start( |
547 | new_channel, | |
548 | msg.u.channel.monitor_timer_interval); | |
549 | if (monitor_start_ret < 0) { | |
550 | ERR("Starting channel monitoring timer failed"); | |
551 | goto end_nosignal; | |
552 | } | |
553 | ||
94d49140 | 554 | } |
e43c41c5 | 555 | |
9ce5646a MD |
556 | health_code_update(); |
557 | ||
e43c41c5 | 558 | /* If we received an error in add_channel, we need to report it. */ |
821fffb2 | 559 | if (ret < 0) { |
1803a064 MD |
560 | ret = consumer_send_status_msg(sock, ret); |
561 | if (ret < 0) { | |
562 | goto error_fatal; | |
563 | } | |
e43c41c5 JD |
564 | goto end_nosignal; |
565 | } | |
566 | ||
3bd1e081 MD |
567 | goto end_nosignal; |
568 | } | |
569 | case LTTNG_CONSUMER_ADD_STREAM: | |
570 | { | |
dae10966 DG |
571 | int fd; |
572 | struct lttng_pipe *stream_pipe; | |
00e2e675 | 573 | struct lttng_consumer_stream *new_stream; |
ffe60014 | 574 | struct lttng_consumer_channel *channel; |
c80048c6 | 575 | int alloc_ret = 0; |
3bd1e081 | 576 | |
ffe60014 DG |
577 | /* |
578 | * Get stream's channel reference. Needed when adding the stream to the | |
579 | * global hash table. | |
580 | */ | |
581 | channel = consumer_find_channel(msg.u.stream.channel_key); | |
582 | if (!channel) { | |
583 | /* | |
584 | * We could not find the channel. Can happen if cpu hotplug | |
585 | * happens while tearing down. | |
586 | */ | |
d88aee68 | 587 | ERR("Unable to find channel key %" PRIu64, msg.u.stream.channel_key); |
e462382a | 588 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
ffe60014 DG |
589 | } |
590 | ||
9ce5646a MD |
591 | health_code_update(); |
592 | ||
f50f23d9 DG |
593 | /* First send a status message before receiving the fds. */ |
594 | ret = consumer_send_status_msg(sock, ret_code); | |
1803a064 | 595 | if (ret < 0) { |
d771f832 | 596 | /* Somehow, the session daemon is not responding anymore. */ |
1803a064 MD |
597 | goto error_fatal; |
598 | } | |
9ce5646a MD |
599 | |
600 | health_code_update(); | |
601 | ||
0c759fc9 | 602 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
d771f832 | 603 | /* Channel was not found. */ |
f50f23d9 DG |
604 | goto end_nosignal; |
605 | } | |
606 | ||
d771f832 | 607 | /* Blocking call */ |
9ce5646a MD |
608 | health_poll_entry(); |
609 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
610 | health_poll_exit(); | |
84382d49 MD |
611 | if (ret) { |
612 | goto error_fatal; | |
3bd1e081 | 613 | } |
00e2e675 | 614 | |
9ce5646a MD |
615 | health_code_update(); |
616 | ||
00e2e675 | 617 | /* Get stream file descriptor from socket */ |
f2fc6720 MD |
618 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); |
619 | if (ret != sizeof(fd)) { | |
f73fabfd | 620 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
3f8e211f | 621 | rcu_read_unlock(); |
3bd1e081 MD |
622 | return ret; |
623 | } | |
3bd1e081 | 624 | |
9ce5646a MD |
625 | health_code_update(); |
626 | ||
f50f23d9 DG |
627 | /* |
628 | * Send status code to session daemon only if the recv works. If the | |
629 | * above recv() failed, the session daemon is notified through the | |
630 | * error socket and the teardown is eventually done. | |
631 | */ | |
632 | ret = consumer_send_status_msg(sock, ret_code); | |
633 | if (ret < 0) { | |
634 | /* Somehow, the session daemon is not responding anymore. */ | |
635 | goto end_nosignal; | |
636 | } | |
637 | ||
9ce5646a MD |
638 | health_code_update(); |
639 | ||
ffe60014 DG |
640 | new_stream = consumer_allocate_stream(channel->key, |
641 | fd, | |
642 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
643 | channel->name, | |
644 | channel->uid, | |
645 | channel->gid, | |
646 | channel->relayd_id, | |
647 | channel->session_id, | |
648 | msg.u.stream.cpu, | |
649 | &alloc_ret, | |
4891ece8 DG |
650 | channel->type, |
651 | channel->monitor); | |
3bd1e081 | 652 | if (new_stream == NULL) { |
c80048c6 MD |
653 | switch (alloc_ret) { |
654 | case -ENOMEM: | |
655 | case -EINVAL: | |
656 | default: | |
657 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
658 | break; | |
c80048c6 | 659 | } |
3f8e211f | 660 | goto end_nosignal; |
3bd1e081 | 661 | } |
d771f832 | 662 | |
ffe60014 DG |
663 | new_stream->chan = channel; |
664 | new_stream->wait_fd = fd; | |
07b86b52 JD |
665 | switch (channel->output) { |
666 | case CONSUMER_CHANNEL_SPLICE: | |
667 | new_stream->output = LTTNG_EVENT_SPLICE; | |
a2361a61 JD |
668 | ret = utils_create_pipe(new_stream->splice_pipe); |
669 | if (ret < 0) { | |
670 | goto end_nosignal; | |
671 | } | |
07b86b52 JD |
672 | break; |
673 | case CONSUMER_CHANNEL_MMAP: | |
674 | new_stream->output = LTTNG_EVENT_MMAP; | |
675 | break; | |
676 | default: | |
677 | ERR("Stream output unknown %d", channel->output); | |
678 | goto end_nosignal; | |
679 | } | |
00e2e675 | 680 | |
a0c83db9 DG |
681 | /* |
682 | * We've just assigned the channel to the stream so increment the | |
07b86b52 JD |
683 | * refcount right now. We don't need to increment the refcount for |
684 | * streams in no monitor because we handle manually the cleanup of | |
685 | * those. It is very important to make sure there is NO prior | |
686 | * consumer_del_stream() calls or else the refcount will be unbalanced. | |
a0c83db9 | 687 | */ |
07b86b52 JD |
688 | if (channel->monitor) { |
689 | uatomic_inc(&new_stream->chan->refcount); | |
690 | } | |
9d9353f9 | 691 | |
fb3a43a9 DG |
692 | /* |
693 | * The buffer flush is done on the session daemon side for the kernel | |
694 | * so no need for the stream "hangup_flush_done" variable to be | |
695 | * tracked. This is important for a kernel stream since we don't rely | |
696 | * on the flush state of the stream to read data. It's not the case for | |
697 | * user space tracing. | |
698 | */ | |
699 | new_stream->hangup_flush_done = 0; | |
700 | ||
9ce5646a MD |
701 | health_code_update(); |
702 | ||
633d0084 DG |
703 | if (ctx->on_recv_stream) { |
704 | ret = ctx->on_recv_stream(new_stream); | |
705 | if (ret < 0) { | |
d771f832 | 706 | consumer_stream_free(new_stream); |
633d0084 | 707 | goto end_nosignal; |
fb3a43a9 | 708 | } |
633d0084 | 709 | } |
fb3a43a9 | 710 | |
9ce5646a MD |
711 | health_code_update(); |
712 | ||
07b86b52 JD |
713 | if (new_stream->metadata_flag) { |
714 | channel->metadata_stream = new_stream; | |
715 | } | |
716 | ||
2bba9e53 DG |
717 | /* Do not monitor this stream. */ |
718 | if (!channel->monitor) { | |
5eecee74 | 719 | DBG("Kernel consumer add stream %s in no monitor mode with " |
6dc3064a | 720 | "relayd id %" PRIu64, new_stream->name, |
5eecee74 | 721 | new_stream->net_seq_idx); |
10a50311 | 722 | cds_list_add(&new_stream->send_node, &channel->streams.head); |
6dc3064a DG |
723 | break; |
724 | } | |
725 | ||
e1b71bdc DG |
726 | /* Send stream to relayd if the stream has an ID. */ |
727 | if (new_stream->net_seq_idx != (uint64_t) -1ULL) { | |
194ee077 DG |
728 | ret = consumer_send_relayd_stream(new_stream, |
729 | new_stream->chan->pathname); | |
e1b71bdc DG |
730 | if (ret < 0) { |
731 | consumer_stream_free(new_stream); | |
732 | goto end_nosignal; | |
733 | } | |
1bf914e0 MD |
734 | |
735 | /* | |
736 | * If adding an extra stream to an already | |
737 | * existing channel (e.g. cpu hotplug), we need | |
738 | * to send the "streams_sent" command to relayd. | |
739 | */ | |
740 | if (channel->streams_sent_to_relayd) { | |
741 | ret = consumer_send_relayd_streams_sent( | |
742 | new_stream->net_seq_idx); | |
743 | if (ret < 0) { | |
744 | goto end_nosignal; | |
745 | } | |
746 | } | |
e2039c7a JD |
747 | } |
748 | ||
50f8ae69 | 749 | /* Get the right pipe where the stream will be sent. */ |
633d0084 | 750 | if (new_stream->metadata_flag) { |
5ab66908 MD |
751 | ret = consumer_add_metadata_stream(new_stream); |
752 | if (ret) { | |
753 | ERR("Consumer add metadata stream %" PRIu64 " failed. Continuing", | |
754 | new_stream->key); | |
755 | consumer_stream_free(new_stream); | |
756 | goto end_nosignal; | |
757 | } | |
dae10966 | 758 | stream_pipe = ctx->consumer_metadata_pipe; |
3bd1e081 | 759 | } else { |
5ab66908 MD |
760 | ret = consumer_add_data_stream(new_stream); |
761 | if (ret) { | |
762 | ERR("Consumer add stream %" PRIu64 " failed. Continuing", | |
763 | new_stream->key); | |
764 | consumer_stream_free(new_stream); | |
765 | goto end_nosignal; | |
766 | } | |
dae10966 | 767 | stream_pipe = ctx->consumer_data_pipe; |
50f8ae69 DG |
768 | } |
769 | ||
5ab66908 MD |
770 | /* Vitible to other threads */ |
771 | new_stream->globally_visible = 1; | |
772 | ||
9ce5646a MD |
773 | health_code_update(); |
774 | ||
dae10966 | 775 | ret = lttng_pipe_write(stream_pipe, &new_stream, sizeof(new_stream)); |
50f8ae69 | 776 | if (ret < 0) { |
dae10966 | 777 | ERR("Consumer write %s stream to pipe %d", |
50f8ae69 | 778 | new_stream->metadata_flag ? "metadata" : "data", |
dae10966 | 779 | lttng_pipe_get_writefd(stream_pipe)); |
5ab66908 MD |
780 | if (new_stream->metadata_flag) { |
781 | consumer_del_stream_for_metadata(new_stream); | |
782 | } else { | |
783 | consumer_del_stream_for_data(new_stream); | |
784 | } | |
50f8ae69 | 785 | goto end_nosignal; |
3bd1e081 | 786 | } |
00e2e675 | 787 | |
50f8ae69 | 788 | DBG("Kernel consumer ADD_STREAM %s (fd: %d) with relayd id %" PRIu64, |
ffe60014 | 789 | new_stream->name, fd, new_stream->relayd_stream_id); |
3bd1e081 MD |
790 | break; |
791 | } | |
a4baae1b JD |
792 | case LTTNG_CONSUMER_STREAMS_SENT: |
793 | { | |
794 | struct lttng_consumer_channel *channel; | |
795 | ||
796 | /* | |
797 | * Get stream's channel reference. Needed when adding the stream to the | |
798 | * global hash table. | |
799 | */ | |
800 | channel = consumer_find_channel(msg.u.sent_streams.channel_key); | |
801 | if (!channel) { | |
802 | /* | |
803 | * We could not find the channel. Can happen if cpu hotplug | |
804 | * happens while tearing down. | |
805 | */ | |
806 | ERR("Unable to find channel key %" PRIu64, | |
807 | msg.u.sent_streams.channel_key); | |
e462382a | 808 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
a4baae1b JD |
809 | } |
810 | ||
811 | health_code_update(); | |
812 | ||
813 | /* | |
814 | * Send status code to session daemon. | |
815 | */ | |
816 | ret = consumer_send_status_msg(sock, ret_code); | |
f261ad0a | 817 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
a4baae1b JD |
818 | /* Somehow, the session daemon is not responding anymore. */ |
819 | goto end_nosignal; | |
820 | } | |
821 | ||
822 | health_code_update(); | |
823 | ||
824 | /* | |
825 | * We should not send this message if we don't monitor the | |
826 | * streams in this channel. | |
827 | */ | |
828 | if (!channel->monitor) { | |
829 | break; | |
830 | } | |
831 | ||
832 | health_code_update(); | |
833 | /* Send stream to relayd if the stream has an ID. */ | |
834 | if (msg.u.sent_streams.net_seq_idx != (uint64_t) -1ULL) { | |
835 | ret = consumer_send_relayd_streams_sent( | |
836 | msg.u.sent_streams.net_seq_idx); | |
837 | if (ret < 0) { | |
838 | goto end_nosignal; | |
839 | } | |
1bf914e0 | 840 | channel->streams_sent_to_relayd = true; |
a4baae1b JD |
841 | } |
842 | break; | |
843 | } | |
3bd1e081 MD |
844 | case LTTNG_CONSUMER_UPDATE_STREAM: |
845 | { | |
3f8e211f DG |
846 | rcu_read_unlock(); |
847 | return -ENOSYS; | |
848 | } | |
849 | case LTTNG_CONSUMER_DESTROY_RELAYD: | |
850 | { | |
a6ba4fe1 | 851 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
3f8e211f DG |
852 | struct consumer_relayd_sock_pair *relayd; |
853 | ||
a6ba4fe1 | 854 | DBG("Kernel consumer destroying relayd %" PRIu64, index); |
3f8e211f DG |
855 | |
856 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 857 | relayd = consumer_find_relayd(index); |
3f8e211f | 858 | if (relayd == NULL) { |
3448e266 | 859 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 860 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
3bd1e081 | 861 | } |
3f8e211f | 862 | |
a6ba4fe1 DG |
863 | /* |
864 | * Each relayd socket pair has a refcount of stream attached to it | |
865 | * which tells if the relayd is still active or not depending on the | |
866 | * refcount value. | |
867 | * | |
868 | * This will set the destroy flag of the relayd object and destroy it | |
869 | * if the refcount reaches zero when called. | |
870 | * | |
871 | * The destroy can happen either here or when a stream fd hangs up. | |
872 | */ | |
f50f23d9 DG |
873 | if (relayd) { |
874 | consumer_flag_relayd_for_destroy(relayd); | |
875 | } | |
876 | ||
9ce5646a MD |
877 | health_code_update(); |
878 | ||
f50f23d9 DG |
879 | ret = consumer_send_status_msg(sock, ret_code); |
880 | if (ret < 0) { | |
881 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 882 | goto error_fatal; |
f50f23d9 | 883 | } |
3f8e211f | 884 | |
3f8e211f | 885 | goto end_nosignal; |
3bd1e081 | 886 | } |
6d805429 | 887 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 888 | { |
c8f59ee5 | 889 | int32_t ret; |
6d805429 | 890 | uint64_t id = msg.u.data_pending.session_id; |
c8f59ee5 | 891 | |
6d805429 | 892 | DBG("Kernel consumer data pending command for id %" PRIu64, id); |
c8f59ee5 | 893 | |
6d805429 | 894 | ret = consumer_data_pending(id); |
c8f59ee5 | 895 | |
9ce5646a MD |
896 | health_code_update(); |
897 | ||
c8f59ee5 DG |
898 | /* Send back returned value to session daemon */ |
899 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
900 | if (ret < 0) { | |
6d805429 | 901 | PERROR("send data pending ret code"); |
1803a064 | 902 | goto error_fatal; |
c8f59ee5 | 903 | } |
f50f23d9 DG |
904 | |
905 | /* | |
906 | * No need to send back a status message since the data pending | |
907 | * returned value is the response. | |
908 | */ | |
c8f59ee5 | 909 | break; |
53632229 | 910 | } |
6dc3064a DG |
911 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
912 | { | |
07b86b52 JD |
913 | if (msg.u.snapshot_channel.metadata == 1) { |
914 | ret = lttng_kconsumer_snapshot_metadata(msg.u.snapshot_channel.key, | |
e2039c7a JD |
915 | msg.u.snapshot_channel.pathname, |
916 | msg.u.snapshot_channel.relayd_id, ctx); | |
07b86b52 JD |
917 | if (ret < 0) { |
918 | ERR("Snapshot metadata failed"); | |
e462382a | 919 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; |
07b86b52 JD |
920 | } |
921 | } else { | |
922 | ret = lttng_kconsumer_snapshot_channel(msg.u.snapshot_channel.key, | |
923 | msg.u.snapshot_channel.pathname, | |
5c786ded | 924 | msg.u.snapshot_channel.relayd_id, |
d07ceecd | 925 | msg.u.snapshot_channel.nb_packets_per_stream, |
5c786ded | 926 | ctx); |
07b86b52 JD |
927 | if (ret < 0) { |
928 | ERR("Snapshot channel failed"); | |
e462382a | 929 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
07b86b52 JD |
930 | } |
931 | } | |
932 | ||
9ce5646a MD |
933 | health_code_update(); |
934 | ||
6dc3064a DG |
935 | ret = consumer_send_status_msg(sock, ret_code); |
936 | if (ret < 0) { | |
937 | /* Somehow, the session daemon is not responding anymore. */ | |
938 | goto end_nosignal; | |
939 | } | |
940 | break; | |
941 | } | |
07b86b52 JD |
942 | case LTTNG_CONSUMER_DESTROY_CHANNEL: |
943 | { | |
944 | uint64_t key = msg.u.destroy_channel.key; | |
945 | struct lttng_consumer_channel *channel; | |
946 | ||
947 | channel = consumer_find_channel(key); | |
948 | if (!channel) { | |
949 | ERR("Kernel consumer destroy channel %" PRIu64 " not found", key); | |
e462382a | 950 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
07b86b52 JD |
951 | } |
952 | ||
9ce5646a MD |
953 | health_code_update(); |
954 | ||
07b86b52 JD |
955 | ret = consumer_send_status_msg(sock, ret_code); |
956 | if (ret < 0) { | |
957 | /* Somehow, the session daemon is not responding anymore. */ | |
958 | goto end_nosignal; | |
959 | } | |
960 | ||
9ce5646a MD |
961 | health_code_update(); |
962 | ||
15dc512a DG |
963 | /* Stop right now if no channel was found. */ |
964 | if (!channel) { | |
965 | goto end_nosignal; | |
966 | } | |
967 | ||
07b86b52 JD |
968 | /* |
969 | * This command should ONLY be issued for channel with streams set in | |
970 | * no monitor mode. | |
971 | */ | |
972 | assert(!channel->monitor); | |
973 | ||
974 | /* | |
975 | * The refcount should ALWAYS be 0 in the case of a channel in no | |
976 | * monitor mode. | |
977 | */ | |
978 | assert(!uatomic_sub_return(&channel->refcount, 1)); | |
979 | ||
980 | consumer_del_channel(channel); | |
981 | ||
982 | goto end_nosignal; | |
983 | } | |
fb83fe64 JD |
984 | case LTTNG_CONSUMER_DISCARDED_EVENTS: |
985 | { | |
986 | uint64_t ret; | |
987 | struct lttng_consumer_channel *channel; | |
988 | uint64_t id = msg.u.discarded_events.session_id; | |
989 | uint64_t key = msg.u.discarded_events.channel_key; | |
990 | ||
e5742757 MD |
991 | DBG("Kernel consumer discarded events command for session id %" |
992 | PRIu64 ", channel key %" PRIu64, id, key); | |
993 | ||
fb83fe64 JD |
994 | channel = consumer_find_channel(key); |
995 | if (!channel) { | |
996 | ERR("Kernel consumer discarded events channel %" | |
997 | PRIu64 " not found", key); | |
e5742757 MD |
998 | ret = 0; |
999 | } else { | |
1000 | ret = channel->discarded_events; | |
fb83fe64 JD |
1001 | } |
1002 | ||
fb83fe64 JD |
1003 | health_code_update(); |
1004 | ||
1005 | /* Send back returned value to session daemon */ | |
1006 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
1007 | if (ret < 0) { | |
1008 | PERROR("send discarded events"); | |
1009 | goto error_fatal; | |
1010 | } | |
1011 | ||
1012 | break; | |
1013 | } | |
1014 | case LTTNG_CONSUMER_LOST_PACKETS: | |
1015 | { | |
1016 | uint64_t ret; | |
1017 | struct lttng_consumer_channel *channel; | |
1018 | uint64_t id = msg.u.lost_packets.session_id; | |
1019 | uint64_t key = msg.u.lost_packets.channel_key; | |
1020 | ||
e5742757 MD |
1021 | DBG("Kernel consumer lost packets command for session id %" |
1022 | PRIu64 ", channel key %" PRIu64, id, key); | |
1023 | ||
fb83fe64 JD |
1024 | channel = consumer_find_channel(key); |
1025 | if (!channel) { | |
1026 | ERR("Kernel consumer lost packets channel %" | |
1027 | PRIu64 " not found", key); | |
e5742757 MD |
1028 | ret = 0; |
1029 | } else { | |
1030 | ret = channel->lost_packets; | |
fb83fe64 JD |
1031 | } |
1032 | ||
fb83fe64 JD |
1033 | health_code_update(); |
1034 | ||
1035 | /* Send back returned value to session daemon */ | |
1036 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
1037 | if (ret < 0) { | |
1038 | PERROR("send lost packets"); | |
1039 | goto error_fatal; | |
1040 | } | |
1041 | ||
1042 | break; | |
1043 | } | |
b3530820 JG |
1044 | case LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE: |
1045 | { | |
1046 | int channel_monitor_pipe; | |
1047 | ||
1048 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1049 | /* Successfully received the command's type. */ | |
1050 | ret = consumer_send_status_msg(sock, ret_code); | |
1051 | if (ret < 0) { | |
1052 | goto error_fatal; | |
1053 | } | |
1054 | ||
1055 | ret = lttcomm_recv_fds_unix_sock(sock, &channel_monitor_pipe, | |
1056 | 1); | |
1057 | if (ret != sizeof(channel_monitor_pipe)) { | |
1058 | ERR("Failed to receive channel monitor pipe"); | |
1059 | goto error_fatal; | |
1060 | } | |
1061 | ||
1062 | DBG("Received channel monitor pipe (%d)", channel_monitor_pipe); | |
1063 | ret = consumer_timer_thread_set_channel_monitor_pipe( | |
1064 | channel_monitor_pipe); | |
1065 | if (!ret) { | |
1066 | int flags; | |
1067 | ||
1068 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1069 | /* Set the pipe as non-blocking. */ | |
1070 | ret = fcntl(channel_monitor_pipe, F_GETFL, 0); | |
1071 | if (ret == -1) { | |
1072 | PERROR("fcntl get flags of the channel monitoring pipe"); | |
1073 | goto error_fatal; | |
1074 | } | |
1075 | flags = ret; | |
1076 | ||
1077 | ret = fcntl(channel_monitor_pipe, F_SETFL, | |
1078 | flags | O_NONBLOCK); | |
1079 | if (ret == -1) { | |
1080 | PERROR("fcntl set O_NONBLOCK flag of the channel monitoring pipe"); | |
1081 | goto error_fatal; | |
1082 | } | |
1083 | DBG("Channel monitor pipe set as non-blocking"); | |
1084 | } else { | |
1085 | ret_code = LTTCOMM_CONSUMERD_ALREADY_SET; | |
1086 | } | |
1087 | ret = consumer_send_status_msg(sock, ret_code); | |
1088 | if (ret < 0) { | |
1089 | goto error_fatal; | |
1090 | } | |
1091 | break; | |
1092 | } | |
3bd1e081 | 1093 | default: |
3f8e211f | 1094 | goto end_nosignal; |
3bd1e081 | 1095 | } |
3f8e211f | 1096 | |
3bd1e081 | 1097 | end_nosignal: |
b0b335c8 | 1098 | rcu_read_unlock(); |
4cbc1a04 DG |
1099 | |
1100 | /* | |
1101 | * Return 1 to indicate success since the 0 value can be a socket | |
1102 | * shutdown during the recv() or send() call. | |
1103 | */ | |
9ce5646a | 1104 | health_code_update(); |
4cbc1a04 | 1105 | return 1; |
1803a064 MD |
1106 | |
1107 | error_fatal: | |
1108 | rcu_read_unlock(); | |
1109 | /* This will issue a consumer stop. */ | |
1110 | return -1; | |
3bd1e081 | 1111 | } |
d41f73b7 | 1112 | |
309167d2 JD |
1113 | /* |
1114 | * Populate index values of a kernel stream. Values are set in big endian order. | |
1115 | * | |
1116 | * Return 0 on success or else a negative value. | |
1117 | */ | |
50adc264 | 1118 | static int get_index_values(struct ctf_packet_index *index, int infd) |
309167d2 JD |
1119 | { |
1120 | int ret; | |
1121 | ||
1122 | ret = kernctl_get_timestamp_begin(infd, &index->timestamp_begin); | |
1123 | if (ret < 0) { | |
1124 | PERROR("kernctl_get_timestamp_begin"); | |
1125 | goto error; | |
1126 | } | |
1127 | index->timestamp_begin = htobe64(index->timestamp_begin); | |
1128 | ||
1129 | ret = kernctl_get_timestamp_end(infd, &index->timestamp_end); | |
1130 | if (ret < 0) { | |
1131 | PERROR("kernctl_get_timestamp_end"); | |
1132 | goto error; | |
1133 | } | |
1134 | index->timestamp_end = htobe64(index->timestamp_end); | |
1135 | ||
1136 | ret = kernctl_get_events_discarded(infd, &index->events_discarded); | |
1137 | if (ret < 0) { | |
1138 | PERROR("kernctl_get_events_discarded"); | |
1139 | goto error; | |
1140 | } | |
1141 | index->events_discarded = htobe64(index->events_discarded); | |
1142 | ||
1143 | ret = kernctl_get_content_size(infd, &index->content_size); | |
1144 | if (ret < 0) { | |
1145 | PERROR("kernctl_get_content_size"); | |
1146 | goto error; | |
1147 | } | |
1148 | index->content_size = htobe64(index->content_size); | |
1149 | ||
1150 | ret = kernctl_get_packet_size(infd, &index->packet_size); | |
1151 | if (ret < 0) { | |
1152 | PERROR("kernctl_get_packet_size"); | |
1153 | goto error; | |
1154 | } | |
1155 | index->packet_size = htobe64(index->packet_size); | |
1156 | ||
1157 | ret = kernctl_get_stream_id(infd, &index->stream_id); | |
1158 | if (ret < 0) { | |
1159 | PERROR("kernctl_get_stream_id"); | |
1160 | goto error; | |
1161 | } | |
1162 | index->stream_id = htobe64(index->stream_id); | |
1163 | ||
234cd636 JD |
1164 | ret = kernctl_get_instance_id(infd, &index->stream_instance_id); |
1165 | if (ret < 0) { | |
f0b03c22 MD |
1166 | if (ret == -ENOTTY) { |
1167 | /* Command not implemented by lttng-modules. */ | |
1168 | index->stream_instance_id = -1ULL; | |
f0b03c22 MD |
1169 | } else { |
1170 | PERROR("kernctl_get_instance_id"); | |
1171 | goto error; | |
1172 | } | |
234cd636 JD |
1173 | } |
1174 | index->stream_instance_id = htobe64(index->stream_instance_id); | |
1175 | ||
1176 | ret = kernctl_get_sequence_number(infd, &index->packet_seq_num); | |
1177 | if (ret < 0) { | |
f0b03c22 MD |
1178 | if (ret == -ENOTTY) { |
1179 | /* Command not implemented by lttng-modules. */ | |
1180 | index->packet_seq_num = -1ULL; | |
1181 | ret = 0; | |
1182 | } else { | |
1183 | PERROR("kernctl_get_sequence_number"); | |
1184 | goto error; | |
1185 | } | |
234cd636 JD |
1186 | } |
1187 | index->packet_seq_num = htobe64(index->packet_seq_num); | |
1188 | ||
309167d2 JD |
1189 | error: |
1190 | return ret; | |
1191 | } | |
94d49140 JD |
1192 | /* |
1193 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
1194 | * metadata thread can consumer them. | |
1195 | * | |
1196 | * Metadata stream lock MUST be acquired. | |
1197 | * | |
1198 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream | |
1199 | * is empty or a negative value on error. | |
1200 | */ | |
1201 | int lttng_kconsumer_sync_metadata(struct lttng_consumer_stream *metadata) | |
1202 | { | |
1203 | int ret; | |
1204 | ||
1205 | assert(metadata); | |
1206 | ||
1207 | ret = kernctl_buffer_flush(metadata->wait_fd); | |
1208 | if (ret < 0) { | |
1209 | ERR("Failed to flush kernel stream"); | |
1210 | goto end; | |
1211 | } | |
1212 | ||
1213 | ret = kernctl_snapshot(metadata->wait_fd); | |
1214 | if (ret < 0) { | |
32af2c95 | 1215 | if (ret != -EAGAIN) { |
94d49140 JD |
1216 | ERR("Sync metadata, taking kernel snapshot failed."); |
1217 | goto end; | |
1218 | } | |
1219 | DBG("Sync metadata, no new kernel metadata"); | |
1220 | /* No new metadata, exit. */ | |
1221 | ret = ENODATA; | |
1222 | goto end; | |
1223 | } | |
1224 | ||
1225 | end: | |
1226 | return ret; | |
1227 | } | |
309167d2 | 1228 | |
fb83fe64 JD |
1229 | static |
1230 | int update_stream_stats(struct lttng_consumer_stream *stream) | |
1231 | { | |
1232 | int ret; | |
1233 | uint64_t seq, discarded; | |
1234 | ||
1235 | ret = kernctl_get_sequence_number(stream->wait_fd, &seq); | |
1236 | if (ret < 0) { | |
f0b03c22 MD |
1237 | if (ret == -ENOTTY) { |
1238 | /* Command not implemented by lttng-modules. */ | |
1239 | seq = -1ULL; | |
f0b03c22 MD |
1240 | } else { |
1241 | PERROR("kernctl_get_sequence_number"); | |
1242 | goto end; | |
1243 | } | |
fb83fe64 JD |
1244 | } |
1245 | ||
1246 | /* | |
1247 | * Start the sequence when we extract the first packet in case we don't | |
1248 | * start at 0 (for example if a consumer is not connected to the | |
1249 | * session immediately after the beginning). | |
1250 | */ | |
1251 | if (stream->last_sequence_number == -1ULL) { | |
1252 | stream->last_sequence_number = seq; | |
1253 | } else if (seq > stream->last_sequence_number) { | |
1254 | stream->chan->lost_packets += seq - | |
1255 | stream->last_sequence_number - 1; | |
1256 | } else { | |
1257 | /* seq <= last_sequence_number */ | |
1258 | ERR("Sequence number inconsistent : prev = %" PRIu64 | |
1259 | ", current = %" PRIu64, | |
1260 | stream->last_sequence_number, seq); | |
1261 | ret = -1; | |
1262 | goto end; | |
1263 | } | |
1264 | stream->last_sequence_number = seq; | |
1265 | ||
1266 | ret = kernctl_get_events_discarded(stream->wait_fd, &discarded); | |
1267 | if (ret < 0) { | |
1268 | PERROR("kernctl_get_events_discarded"); | |
1269 | goto end; | |
1270 | } | |
1271 | if (discarded < stream->last_discarded_events) { | |
1272 | /* | |
83f4233d MJ |
1273 | * Overflow has occurred. We assume only one wrap-around |
1274 | * has occurred. | |
fb83fe64 JD |
1275 | */ |
1276 | stream->chan->discarded_events += (1ULL << (CAA_BITS_PER_LONG - 1)) - | |
1277 | stream->last_discarded_events + discarded; | |
1278 | } else { | |
1279 | stream->chan->discarded_events += discarded - | |
1280 | stream->last_discarded_events; | |
1281 | } | |
1282 | stream->last_discarded_events = discarded; | |
1283 | ret = 0; | |
1284 | ||
1285 | end: | |
1286 | return ret; | |
1287 | } | |
1288 | ||
93ec662e JD |
1289 | /* |
1290 | * Check if the local version of the metadata stream matches with the version | |
1291 | * of the metadata stream in the kernel. If it was updated, set the reset flag | |
1292 | * on the stream. | |
1293 | */ | |
1294 | static | |
1295 | int metadata_stream_check_version(int infd, struct lttng_consumer_stream *stream) | |
1296 | { | |
1297 | int ret; | |
1298 | uint64_t cur_version; | |
1299 | ||
1300 | ret = kernctl_get_metadata_version(infd, &cur_version); | |
1301 | if (ret < 0) { | |
f0b03c22 MD |
1302 | if (ret == -ENOTTY) { |
1303 | /* | |
1304 | * LTTng-modules does not implement this | |
1305 | * command. | |
1306 | */ | |
1307 | ret = 0; | |
1308 | goto end; | |
1309 | } | |
93ec662e JD |
1310 | ERR("Failed to get the metadata version"); |
1311 | goto end; | |
1312 | } | |
1313 | ||
1314 | if (stream->metadata_version == cur_version) { | |
1315 | ret = 0; | |
1316 | goto end; | |
1317 | } | |
1318 | ||
1319 | DBG("New metadata version detected"); | |
1320 | stream->metadata_version = cur_version; | |
1321 | stream->reset_metadata_flag = 1; | |
1322 | ret = 0; | |
1323 | ||
1324 | end: | |
1325 | return ret; | |
1326 | } | |
1327 | ||
d41f73b7 MD |
1328 | /* |
1329 | * Consume data on a file descriptor and write it on a trace file. | |
1330 | */ | |
4078b776 | 1331 | ssize_t lttng_kconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
1332 | struct lttng_consumer_local_data *ctx) |
1333 | { | |
1d4dfdef | 1334 | unsigned long len, subbuf_size, padding; |
1c20f0e2 | 1335 | int err, write_index = 1; |
4078b776 | 1336 | ssize_t ret = 0; |
d41f73b7 | 1337 | int infd = stream->wait_fd; |
50adc264 | 1338 | struct ctf_packet_index index; |
d41f73b7 MD |
1339 | |
1340 | DBG("In read_subbuffer (infd : %d)", infd); | |
309167d2 | 1341 | |
d41f73b7 MD |
1342 | /* Get the next subbuffer */ |
1343 | err = kernctl_get_next_subbuf(infd); | |
1344 | if (err != 0) { | |
d41f73b7 MD |
1345 | /* |
1346 | * This is a debug message even for single-threaded consumer, | |
1347 | * because poll() have more relaxed criterions than get subbuf, | |
1348 | * so get_subbuf may fail for short race windows where poll() | |
1349 | * would issue wakeups. | |
1350 | */ | |
1351 | DBG("Reserving sub buffer failed (everything is normal, " | |
1352 | "it is due to concurrency)"); | |
32af2c95 | 1353 | ret = err; |
d41f73b7 MD |
1354 | goto end; |
1355 | } | |
1356 | ||
1d4dfdef DG |
1357 | /* Get the full subbuffer size including padding */ |
1358 | err = kernctl_get_padded_subbuf_size(infd, &len); | |
1359 | if (err != 0) { | |
5a510c9f | 1360 | PERROR("Getting sub-buffer len failed."); |
8265f19e MD |
1361 | err = kernctl_put_subbuf(infd); |
1362 | if (err != 0) { | |
32af2c95 | 1363 | if (err == -EFAULT) { |
5a510c9f | 1364 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1365 | } else if (err == -EIO) { |
8265f19e | 1366 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1367 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e | 1368 | } |
32af2c95 | 1369 | ret = err; |
8265f19e MD |
1370 | goto end; |
1371 | } | |
32af2c95 | 1372 | ret = err; |
1d4dfdef DG |
1373 | goto end; |
1374 | } | |
1375 | ||
1c20f0e2 | 1376 | if (!stream->metadata_flag) { |
309167d2 JD |
1377 | ret = get_index_values(&index, infd); |
1378 | if (ret < 0) { | |
8265f19e MD |
1379 | err = kernctl_put_subbuf(infd); |
1380 | if (err != 0) { | |
32af2c95 | 1381 | if (err == -EFAULT) { |
5a510c9f | 1382 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1383 | } else if (err == -EIO) { |
8265f19e | 1384 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1385 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e | 1386 | } |
32af2c95 | 1387 | ret = err; |
8265f19e MD |
1388 | goto end; |
1389 | } | |
309167d2 JD |
1390 | goto end; |
1391 | } | |
fb83fe64 JD |
1392 | ret = update_stream_stats(stream); |
1393 | if (ret < 0) { | |
7b87473d MD |
1394 | err = kernctl_put_subbuf(infd); |
1395 | if (err != 0) { | |
1396 | if (err == -EFAULT) { | |
1397 | PERROR("Error in unreserving sub buffer\n"); | |
1398 | } else if (err == -EIO) { | |
1399 | /* Should never happen with newer LTTng versions */ | |
1400 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
1401 | } | |
1402 | ret = err; | |
1403 | goto end; | |
1404 | } | |
fb83fe64 JD |
1405 | goto end; |
1406 | } | |
1c20f0e2 JD |
1407 | } else { |
1408 | write_index = 0; | |
93ec662e JD |
1409 | ret = metadata_stream_check_version(infd, stream); |
1410 | if (ret < 0) { | |
7b87473d MD |
1411 | err = kernctl_put_subbuf(infd); |
1412 | if (err != 0) { | |
1413 | if (err == -EFAULT) { | |
1414 | PERROR("Error in unreserving sub buffer\n"); | |
1415 | } else if (err == -EIO) { | |
1416 | /* Should never happen with newer LTTng versions */ | |
1417 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
1418 | } | |
1419 | ret = err; | |
1420 | goto end; | |
1421 | } | |
93ec662e JD |
1422 | goto end; |
1423 | } | |
309167d2 JD |
1424 | } |
1425 | ||
ffe60014 | 1426 | switch (stream->chan->output) { |
07b86b52 | 1427 | case CONSUMER_CHANNEL_SPLICE: |
1d4dfdef DG |
1428 | /* |
1429 | * XXX: The lttng-modules splice "actor" does not handle copying | |
1430 | * partial pages hence only using the subbuffer size without the | |
1431 | * padding makes the splice fail. | |
1432 | */ | |
1433 | subbuf_size = len; | |
1434 | padding = 0; | |
1435 | ||
1436 | /* splice the subbuffer to the tracefile */ | |
91dfef6e | 1437 | ret = lttng_consumer_on_read_subbuffer_splice(ctx, stream, subbuf_size, |
309167d2 | 1438 | padding, &index); |
91dfef6e DG |
1439 | /* |
1440 | * XXX: Splice does not support network streaming so the return value | |
1441 | * is simply checked against subbuf_size and not like the mmap() op. | |
1442 | */ | |
1d4dfdef DG |
1443 | if (ret != subbuf_size) { |
1444 | /* | |
1445 | * display the error but continue processing to try | |
1446 | * to release the subbuffer | |
1447 | */ | |
1448 | ERR("Error splicing to tracefile (ret: %zd != len: %lu)", | |
1449 | ret, subbuf_size); | |
309167d2 | 1450 | write_index = 0; |
1d4dfdef DG |
1451 | } |
1452 | break; | |
07b86b52 | 1453 | case CONSUMER_CHANNEL_MMAP: |
1d4dfdef DG |
1454 | /* Get subbuffer size without padding */ |
1455 | err = kernctl_get_subbuf_size(infd, &subbuf_size); | |
1456 | if (err != 0) { | |
5a510c9f | 1457 | PERROR("Getting sub-buffer len failed."); |
8265f19e MD |
1458 | err = kernctl_put_subbuf(infd); |
1459 | if (err != 0) { | |
32af2c95 | 1460 | if (err == -EFAULT) { |
5a510c9f | 1461 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1462 | } else if (err == -EIO) { |
8265f19e | 1463 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1464 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e | 1465 | } |
32af2c95 | 1466 | ret = err; |
8265f19e MD |
1467 | goto end; |
1468 | } | |
32af2c95 | 1469 | ret = err; |
1d4dfdef DG |
1470 | goto end; |
1471 | } | |
47e81c02 | 1472 | |
1d4dfdef DG |
1473 | /* Make sure the tracer is not gone mad on us! */ |
1474 | assert(len >= subbuf_size); | |
1475 | ||
1476 | padding = len - subbuf_size; | |
1477 | ||
1478 | /* write the subbuffer to the tracefile */ | |
91dfef6e | 1479 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, |
309167d2 | 1480 | padding, &index); |
91dfef6e DG |
1481 | /* |
1482 | * The mmap operation should write subbuf_size amount of data when | |
1483 | * network streaming or the full padding (len) size when we are _not_ | |
1484 | * streaming. | |
1485 | */ | |
d88aee68 DG |
1486 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
1487 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
1d4dfdef | 1488 | /* |
91dfef6e | 1489 | * Display the error but continue processing to try to release the |
2336629e DG |
1490 | * subbuffer. This is a DBG statement since this is possible to |
1491 | * happen without being a critical error. | |
1d4dfdef | 1492 | */ |
2336629e | 1493 | DBG("Error writing to tracefile " |
91dfef6e DG |
1494 | "(ret: %zd != len: %lu != subbuf_size: %lu)", |
1495 | ret, len, subbuf_size); | |
309167d2 | 1496 | write_index = 0; |
1d4dfdef DG |
1497 | } |
1498 | break; | |
1499 | default: | |
1500 | ERR("Unknown output method"); | |
56591bac | 1501 | ret = -EPERM; |
d41f73b7 MD |
1502 | } |
1503 | ||
1504 | err = kernctl_put_next_subbuf(infd); | |
1505 | if (err != 0) { | |
32af2c95 | 1506 | if (err == -EFAULT) { |
5a510c9f | 1507 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1508 | } else if (err == -EIO) { |
d41f73b7 | 1509 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1510 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
d41f73b7 | 1511 | } |
32af2c95 | 1512 | ret = err; |
d41f73b7 MD |
1513 | goto end; |
1514 | } | |
1515 | ||
309167d2 | 1516 | /* Write index if needed. */ |
1c20f0e2 JD |
1517 | if (!write_index) { |
1518 | goto end; | |
1519 | } | |
1520 | ||
94d49140 JD |
1521 | if (stream->chan->live_timer_interval && !stream->metadata_flag) { |
1522 | /* | |
1523 | * In live, block until all the metadata is sent. | |
1524 | */ | |
c585821b MD |
1525 | pthread_mutex_lock(&stream->metadata_timer_lock); |
1526 | assert(!stream->missed_metadata_flush); | |
1527 | stream->waiting_on_metadata = true; | |
1528 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1529 | ||
94d49140 | 1530 | err = consumer_stream_sync_metadata(ctx, stream->session_id); |
c585821b MD |
1531 | |
1532 | pthread_mutex_lock(&stream->metadata_timer_lock); | |
1533 | stream->waiting_on_metadata = false; | |
1534 | if (stream->missed_metadata_flush) { | |
1535 | stream->missed_metadata_flush = false; | |
1536 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1537 | (void) consumer_flush_kernel_index(stream); | |
1538 | } else { | |
1539 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1540 | } | |
94d49140 JD |
1541 | if (err < 0) { |
1542 | goto end; | |
1543 | } | |
1544 | } | |
1545 | ||
1c20f0e2 JD |
1546 | err = consumer_stream_write_index(stream, &index); |
1547 | if (err < 0) { | |
1548 | goto end; | |
309167d2 JD |
1549 | } |
1550 | ||
d41f73b7 MD |
1551 | end: |
1552 | return ret; | |
1553 | } | |
1554 | ||
1555 | int lttng_kconsumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
1556 | { | |
1557 | int ret; | |
ffe60014 DG |
1558 | |
1559 | assert(stream); | |
1560 | ||
2bba9e53 DG |
1561 | /* |
1562 | * Don't create anything if this is set for streaming or should not be | |
1563 | * monitored. | |
1564 | */ | |
1565 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { | |
fe4477ee JD |
1566 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
1567 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
309167d2 | 1568 | stream->uid, stream->gid, NULL); |
fe4477ee JD |
1569 | if (ret < 0) { |
1570 | goto error; | |
1571 | } | |
1572 | stream->out_fd = ret; | |
1573 | stream->tracefile_size_current = 0; | |
309167d2 JD |
1574 | |
1575 | if (!stream->metadata_flag) { | |
f8f3885c MD |
1576 | struct lttng_index_file *index_file; |
1577 | ||
1578 | index_file = lttng_index_file_create(stream->chan->pathname, | |
309167d2 JD |
1579 | stream->name, stream->uid, stream->gid, |
1580 | stream->chan->tracefile_size, | |
f8f3885c MD |
1581 | stream->tracefile_count_current, |
1582 | CTF_INDEX_MAJOR, CTF_INDEX_MINOR); | |
1583 | if (!index_file) { | |
309167d2 JD |
1584 | goto error; |
1585 | } | |
1b47ae58 | 1586 | assert(!stream->index_file); |
f8f3885c | 1587 | stream->index_file = index_file; |
309167d2 | 1588 | } |
ffe60014 | 1589 | } |
d41f73b7 | 1590 | |
d41f73b7 MD |
1591 | if (stream->output == LTTNG_EVENT_MMAP) { |
1592 | /* get the len of the mmap region */ | |
1593 | unsigned long mmap_len; | |
1594 | ||
1595 | ret = kernctl_get_mmap_len(stream->wait_fd, &mmap_len); | |
1596 | if (ret != 0) { | |
ffe60014 | 1597 | PERROR("kernctl_get_mmap_len"); |
d41f73b7 MD |
1598 | goto error_close_fd; |
1599 | } | |
1600 | stream->mmap_len = (size_t) mmap_len; | |
1601 | ||
ffe60014 DG |
1602 | stream->mmap_base = mmap(NULL, stream->mmap_len, PROT_READ, |
1603 | MAP_PRIVATE, stream->wait_fd, 0); | |
d41f73b7 | 1604 | if (stream->mmap_base == MAP_FAILED) { |
ffe60014 | 1605 | PERROR("Error mmaping"); |
d41f73b7 MD |
1606 | ret = -1; |
1607 | goto error_close_fd; | |
1608 | } | |
1609 | } | |
1610 | ||
1611 | /* we return 0 to let the library handle the FD internally */ | |
1612 | return 0; | |
1613 | ||
1614 | error_close_fd: | |
2f225ce2 | 1615 | if (stream->out_fd >= 0) { |
d41f73b7 MD |
1616 | int err; |
1617 | ||
1618 | err = close(stream->out_fd); | |
1619 | assert(!err); | |
2f225ce2 | 1620 | stream->out_fd = -1; |
d41f73b7 MD |
1621 | } |
1622 | error: | |
1623 | return ret; | |
1624 | } | |
1625 | ||
ca22feea DG |
1626 | /* |
1627 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
1628 | * stream. Consumer data lock MUST be acquired before calling this function |
1629 | * and the stream lock. | |
ca22feea | 1630 | * |
6d805429 | 1631 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
1632 | * data is available for trace viewer reading. |
1633 | */ | |
6d805429 | 1634 | int lttng_kconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
1635 | { |
1636 | int ret; | |
1637 | ||
1638 | assert(stream); | |
1639 | ||
873b9e9a MD |
1640 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
1641 | ret = 0; | |
1642 | goto end; | |
1643 | } | |
1644 | ||
ca22feea DG |
1645 | ret = kernctl_get_next_subbuf(stream->wait_fd); |
1646 | if (ret == 0) { | |
1647 | /* There is still data so let's put back this subbuffer. */ | |
1648 | ret = kernctl_put_subbuf(stream->wait_fd); | |
1649 | assert(ret == 0); | |
6d805429 | 1650 | ret = 1; /* Data is pending */ |
4e9a4686 | 1651 | goto end; |
ca22feea DG |
1652 | } |
1653 | ||
6d805429 DG |
1654 | /* Data is NOT pending and ready to be read. */ |
1655 | ret = 0; | |
ca22feea | 1656 | |
6efae65e DG |
1657 | end: |
1658 | return ret; | |
ca22feea | 1659 | } |