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); | |
6bcde26b JD |
63 | /* |
64 | * -EAGAIN is not an error, it just means that there is no data to | |
65 | * be read. | |
66 | */ | |
67 | if (ret != 0 && ret != -EAGAIN) { | |
5a510c9f | 68 | PERROR("Getting sub-buffer snapshot."); |
3bd1e081 MD |
69 | } |
70 | ||
71 | return ret; | |
72 | } | |
73 | ||
e9404c27 JG |
74 | /* |
75 | * Sample consumed and produced positions for a specific fd. | |
76 | * | |
77 | * Returns 0 on success, < 0 on error. | |
78 | */ | |
79 | int lttng_kconsumer_sample_snapshot_positions( | |
80 | struct lttng_consumer_stream *stream) | |
81 | { | |
82 | assert(stream); | |
83 | ||
84 | return kernctl_snapshot_sample_positions(stream->wait_fd); | |
85 | } | |
86 | ||
3bd1e081 MD |
87 | /* |
88 | * Get the produced position | |
89 | * | |
90 | * Returns 0 on success, < 0 on error | |
91 | */ | |
ffe60014 | 92 | int lttng_kconsumer_get_produced_snapshot(struct lttng_consumer_stream *stream, |
3bd1e081 MD |
93 | unsigned long *pos) |
94 | { | |
95 | int ret; | |
96 | int infd = stream->wait_fd; | |
97 | ||
98 | ret = kernctl_snapshot_get_produced(infd, pos); | |
99 | if (ret != 0) { | |
5a510c9f | 100 | PERROR("kernctl_snapshot_get_produced"); |
3bd1e081 MD |
101 | } |
102 | ||
103 | return ret; | |
104 | } | |
105 | ||
07b86b52 JD |
106 | /* |
107 | * Get the consumerd position | |
108 | * | |
109 | * Returns 0 on success, < 0 on error | |
110 | */ | |
111 | int lttng_kconsumer_get_consumed_snapshot(struct lttng_consumer_stream *stream, | |
112 | unsigned long *pos) | |
113 | { | |
114 | int ret; | |
115 | int infd = stream->wait_fd; | |
116 | ||
117 | ret = kernctl_snapshot_get_consumed(infd, pos); | |
118 | if (ret != 0) { | |
5a510c9f | 119 | PERROR("kernctl_snapshot_get_consumed"); |
07b86b52 JD |
120 | } |
121 | ||
122 | return ret; | |
123 | } | |
124 | ||
07b86b52 JD |
125 | /* |
126 | * Take a snapshot of all the stream of a channel | |
127 | * | |
128 | * Returns 0 on success, < 0 on error | |
129 | */ | |
130 | int lttng_kconsumer_snapshot_channel(uint64_t key, char *path, | |
d07ceecd | 131 | uint64_t relayd_id, uint64_t nb_packets_per_stream, |
5c786ded | 132 | struct lttng_consumer_local_data *ctx) |
07b86b52 JD |
133 | { |
134 | int ret; | |
07b86b52 JD |
135 | struct lttng_consumer_channel *channel; |
136 | struct lttng_consumer_stream *stream; | |
137 | ||
6a00837f | 138 | DBG("Kernel consumer snapshot channel %" PRIu64, key); |
07b86b52 JD |
139 | |
140 | rcu_read_lock(); | |
141 | ||
142 | channel = consumer_find_channel(key); | |
143 | if (!channel) { | |
6a00837f | 144 | ERR("No channel found for key %" PRIu64, key); |
07b86b52 JD |
145 | ret = -1; |
146 | goto end; | |
147 | } | |
148 | ||
149 | /* Splice is not supported yet for channel snapshot. */ | |
150 | if (channel->output != CONSUMER_CHANNEL_MMAP) { | |
151 | ERR("Unsupported output %d", channel->output); | |
152 | ret = -1; | |
153 | goto end; | |
154 | } | |
155 | ||
10a50311 | 156 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { |
923333cd | 157 | unsigned long consumed_pos, produced_pos; |
9ce5646a MD |
158 | |
159 | health_code_update(); | |
160 | ||
07b86b52 JD |
161 | /* |
162 | * Lock stream because we are about to change its state. | |
163 | */ | |
164 | pthread_mutex_lock(&stream->lock); | |
165 | ||
29decac3 DG |
166 | /* |
167 | * Assign the received relayd ID so we can use it for streaming. The streams | |
168 | * are not visible to anyone so this is OK to change it. | |
169 | */ | |
07b86b52 JD |
170 | stream->net_seq_idx = relayd_id; |
171 | channel->relayd_id = relayd_id; | |
172 | if (relayd_id != (uint64_t) -1ULL) { | |
10a50311 | 173 | ret = consumer_send_relayd_stream(stream, path); |
07b86b52 JD |
174 | if (ret < 0) { |
175 | ERR("sending stream to relayd"); | |
176 | goto end_unlock; | |
177 | } | |
07b86b52 JD |
178 | } else { |
179 | ret = utils_create_stream_file(path, stream->name, | |
10a50311 JD |
180 | stream->chan->tracefile_size, |
181 | stream->tracefile_count_current, | |
309167d2 | 182 | stream->uid, stream->gid, NULL); |
07b86b52 JD |
183 | if (ret < 0) { |
184 | ERR("utils_create_stream_file"); | |
185 | goto end_unlock; | |
186 | } | |
187 | ||
188 | stream->out_fd = ret; | |
189 | stream->tracefile_size_current = 0; | |
190 | ||
81ea21bf MD |
191 | DBG("Kernel consumer snapshot stream %s/%s (%" PRIu64 ")", |
192 | path, stream->name, stream->key); | |
07b86b52 JD |
193 | } |
194 | ||
213643b9 | 195 | ret = kernctl_buffer_flush_empty(stream->wait_fd); |
07b86b52 | 196 | if (ret < 0) { |
213643b9 MD |
197 | /* |
198 | * Doing a buffer flush which does not take into | |
199 | * account empty packets. This is not perfect | |
200 | * for stream intersection, but required as a | |
201 | * fall-back when "flush_empty" is not | |
202 | * implemented by lttng-modules. | |
203 | */ | |
204 | ret = kernctl_buffer_flush(stream->wait_fd); | |
205 | if (ret < 0) { | |
206 | ERR("Failed to flush kernel stream"); | |
207 | goto end_unlock; | |
208 | } | |
07b86b52 JD |
209 | goto end_unlock; |
210 | } | |
211 | ||
212 | ret = lttng_kconsumer_take_snapshot(stream); | |
213 | if (ret < 0) { | |
214 | ERR("Taking kernel snapshot"); | |
215 | goto end_unlock; | |
216 | } | |
217 | ||
218 | ret = lttng_kconsumer_get_produced_snapshot(stream, &produced_pos); | |
219 | if (ret < 0) { | |
220 | ERR("Produced kernel snapshot position"); | |
221 | goto end_unlock; | |
222 | } | |
223 | ||
224 | ret = lttng_kconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
225 | if (ret < 0) { | |
226 | ERR("Consumerd kernel snapshot position"); | |
227 | goto end_unlock; | |
228 | } | |
229 | ||
230 | if (stream->max_sb_size == 0) { | |
231 | ret = kernctl_get_max_subbuf_size(stream->wait_fd, | |
232 | &stream->max_sb_size); | |
233 | if (ret < 0) { | |
234 | ERR("Getting kernel max_sb_size"); | |
235 | goto end_unlock; | |
236 | } | |
237 | } | |
238 | ||
d07ceecd MD |
239 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
240 | produced_pos, nb_packets_per_stream, | |
241 | stream->max_sb_size); | |
5c786ded | 242 | |
a578f62f | 243 | while ((long) (consumed_pos - produced_pos) < 0) { |
07b86b52 JD |
244 | ssize_t read_len; |
245 | unsigned long len, padded_len; | |
246 | ||
9ce5646a MD |
247 | health_code_update(); |
248 | ||
07b86b52 JD |
249 | DBG("Kernel consumer taking snapshot at pos %lu", consumed_pos); |
250 | ||
251 | ret = kernctl_get_subbuf(stream->wait_fd, &consumed_pos); | |
252 | if (ret < 0) { | |
32af2c95 | 253 | if (ret != -EAGAIN) { |
07b86b52 JD |
254 | PERROR("kernctl_get_subbuf snapshot"); |
255 | goto end_unlock; | |
256 | } | |
257 | DBG("Kernel consumer get subbuf failed. Skipping it."); | |
258 | consumed_pos += stream->max_sb_size; | |
2947da29 | 259 | stream->chan->lost_packets++; |
07b86b52 JD |
260 | continue; |
261 | } | |
262 | ||
263 | ret = kernctl_get_subbuf_size(stream->wait_fd, &len); | |
264 | if (ret < 0) { | |
265 | ERR("Snapshot kernctl_get_subbuf_size"); | |
29decac3 | 266 | goto error_put_subbuf; |
07b86b52 JD |
267 | } |
268 | ||
269 | ret = kernctl_get_padded_subbuf_size(stream->wait_fd, &padded_len); | |
270 | if (ret < 0) { | |
271 | ERR("Snapshot kernctl_get_padded_subbuf_size"); | |
29decac3 | 272 | goto error_put_subbuf; |
07b86b52 JD |
273 | } |
274 | ||
275 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
309167d2 | 276 | padded_len - len, NULL); |
07b86b52 | 277 | /* |
29decac3 DG |
278 | * We write the padded len in local tracefiles but the data len |
279 | * when using a relay. Display the error but continue processing | |
280 | * to try to release the subbuffer. | |
07b86b52 JD |
281 | */ |
282 | if (relayd_id != (uint64_t) -1ULL) { | |
283 | if (read_len != len) { | |
284 | ERR("Error sending to the relay (ret: %zd != len: %lu)", | |
285 | read_len, len); | |
286 | } | |
287 | } else { | |
288 | if (read_len != padded_len) { | |
289 | ERR("Error writing to tracefile (ret: %zd != len: %lu)", | |
290 | read_len, padded_len); | |
291 | } | |
292 | } | |
293 | ||
294 | ret = kernctl_put_subbuf(stream->wait_fd); | |
295 | if (ret < 0) { | |
296 | ERR("Snapshot kernctl_put_subbuf"); | |
297 | goto end_unlock; | |
298 | } | |
299 | consumed_pos += stream->max_sb_size; | |
300 | } | |
301 | ||
302 | if (relayd_id == (uint64_t) -1ULL) { | |
fdf9986c MD |
303 | if (stream->out_fd >= 0) { |
304 | ret = close(stream->out_fd); | |
305 | if (ret < 0) { | |
306 | PERROR("Kernel consumer snapshot close out_fd"); | |
307 | goto end_unlock; | |
308 | } | |
309 | stream->out_fd = -1; | |
07b86b52 | 310 | } |
07b86b52 JD |
311 | } else { |
312 | close_relayd_stream(stream); | |
313 | stream->net_seq_idx = (uint64_t) -1ULL; | |
314 | } | |
315 | pthread_mutex_unlock(&stream->lock); | |
316 | } | |
317 | ||
318 | /* All good! */ | |
319 | ret = 0; | |
320 | goto end; | |
321 | ||
29decac3 DG |
322 | error_put_subbuf: |
323 | ret = kernctl_put_subbuf(stream->wait_fd); | |
324 | if (ret < 0) { | |
325 | ERR("Snapshot kernctl_put_subbuf error path"); | |
326 | } | |
07b86b52 JD |
327 | end_unlock: |
328 | pthread_mutex_unlock(&stream->lock); | |
329 | end: | |
330 | rcu_read_unlock(); | |
331 | return ret; | |
332 | } | |
333 | ||
334 | /* | |
335 | * Read the whole metadata available for a snapshot. | |
336 | * | |
337 | * Returns 0 on success, < 0 on error | |
338 | */ | |
78346e68 | 339 | static int lttng_kconsumer_snapshot_metadata(uint64_t key, char *path, |
e2039c7a | 340 | uint64_t relayd_id, struct lttng_consumer_local_data *ctx) |
07b86b52 | 341 | { |
d771f832 DG |
342 | int ret, use_relayd = 0; |
343 | ssize_t ret_read; | |
07b86b52 JD |
344 | struct lttng_consumer_channel *metadata_channel; |
345 | struct lttng_consumer_stream *metadata_stream; | |
d771f832 DG |
346 | |
347 | assert(ctx); | |
07b86b52 JD |
348 | |
349 | DBG("Kernel consumer snapshot metadata with key %" PRIu64 " at path %s", | |
350 | key, path); | |
351 | ||
352 | rcu_read_lock(); | |
353 | ||
354 | metadata_channel = consumer_find_channel(key); | |
355 | if (!metadata_channel) { | |
d771f832 | 356 | ERR("Kernel snapshot metadata not found for key %" PRIu64, key); |
07b86b52 | 357 | ret = -1; |
78346e68 | 358 | goto error_no_channel; |
07b86b52 JD |
359 | } |
360 | ||
361 | metadata_stream = metadata_channel->metadata_stream; | |
362 | assert(metadata_stream); | |
78346e68 | 363 | pthread_mutex_lock(&metadata_stream->lock); |
07b86b52 | 364 | |
d771f832 | 365 | /* Flag once that we have a valid relayd for the stream. */ |
e2039c7a | 366 | if (relayd_id != (uint64_t) -1ULL) { |
d771f832 DG |
367 | use_relayd = 1; |
368 | } | |
369 | ||
370 | if (use_relayd) { | |
10a50311 | 371 | ret = consumer_send_relayd_stream(metadata_stream, path); |
e2039c7a | 372 | if (ret < 0) { |
78346e68 | 373 | goto error_snapshot; |
e2039c7a | 374 | } |
e2039c7a JD |
375 | } else { |
376 | ret = utils_create_stream_file(path, metadata_stream->name, | |
377 | metadata_stream->chan->tracefile_size, | |
378 | metadata_stream->tracefile_count_current, | |
309167d2 | 379 | metadata_stream->uid, metadata_stream->gid, NULL); |
e2039c7a | 380 | if (ret < 0) { |
78346e68 | 381 | goto error_snapshot; |
e2039c7a JD |
382 | } |
383 | metadata_stream->out_fd = ret; | |
07b86b52 | 384 | } |
07b86b52 | 385 | |
d771f832 | 386 | do { |
9ce5646a MD |
387 | health_code_update(); |
388 | ||
d771f832 DG |
389 | ret_read = lttng_kconsumer_read_subbuffer(metadata_stream, ctx); |
390 | if (ret_read < 0) { | |
56591bac | 391 | if (ret_read != -EAGAIN) { |
6a00837f | 392 | ERR("Kernel snapshot reading metadata subbuffer (ret: %zd)", |
d771f832 | 393 | ret_read); |
78346e68 JG |
394 | ret = ret_read; |
395 | goto error_snapshot; | |
07b86b52 | 396 | } |
d771f832 | 397 | /* ret_read is negative at this point so we will exit the loop. */ |
07b86b52 JD |
398 | continue; |
399 | } | |
d771f832 | 400 | } while (ret_read >= 0); |
07b86b52 | 401 | |
d771f832 DG |
402 | if (use_relayd) { |
403 | close_relayd_stream(metadata_stream); | |
404 | metadata_stream->net_seq_idx = (uint64_t) -1ULL; | |
405 | } else { | |
fdf9986c MD |
406 | if (metadata_stream->out_fd >= 0) { |
407 | ret = close(metadata_stream->out_fd); | |
408 | if (ret < 0) { | |
409 | PERROR("Kernel consumer snapshot metadata close out_fd"); | |
410 | /* | |
411 | * Don't go on error here since the snapshot was successful at this | |
412 | * point but somehow the close failed. | |
413 | */ | |
414 | } | |
415 | metadata_stream->out_fd = -1; | |
e2039c7a | 416 | } |
e2039c7a JD |
417 | } |
418 | ||
07b86b52 | 419 | ret = 0; |
78346e68 JG |
420 | error_snapshot: |
421 | pthread_mutex_unlock(&metadata_stream->lock); | |
cf53a8a6 JD |
422 | cds_list_del(&metadata_stream->send_node); |
423 | consumer_stream_destroy(metadata_stream, NULL); | |
424 | metadata_channel->metadata_stream = NULL; | |
78346e68 | 425 | error_no_channel: |
07b86b52 JD |
426 | rcu_read_unlock(); |
427 | return ret; | |
428 | } | |
429 | ||
1803a064 MD |
430 | /* |
431 | * Receive command from session daemon and process it. | |
432 | * | |
433 | * Return 1 on success else a negative value or 0. | |
434 | */ | |
3bd1e081 MD |
435 | int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
436 | int sock, struct pollfd *consumer_sockpoll) | |
437 | { | |
438 | ssize_t ret; | |
0c759fc9 | 439 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 MD |
440 | struct lttcomm_consumer_msg msg; |
441 | ||
9ce5646a MD |
442 | health_code_update(); |
443 | ||
3bd1e081 MD |
444 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
445 | if (ret != sizeof(msg)) { | |
1803a064 | 446 | if (ret > 0) { |
c6857fcf | 447 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
1803a064 MD |
448 | ret = -1; |
449 | } | |
3bd1e081 MD |
450 | return ret; |
451 | } | |
9ce5646a MD |
452 | |
453 | health_code_update(); | |
454 | ||
84382d49 MD |
455 | /* Deprecated command */ |
456 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 457 | |
9ce5646a MD |
458 | health_code_update(); |
459 | ||
b0b335c8 MD |
460 | /* relayd needs RCU read-side protection */ |
461 | rcu_read_lock(); | |
462 | ||
3bd1e081 | 463 | switch (msg.cmd_type) { |
00e2e675 DG |
464 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
465 | { | |
f50f23d9 | 466 | /* Session daemon status message are handled in the following call. */ |
3ab4ee7d | 467 | consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
7735ef9e | 468 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, |
d3e2ba59 | 469 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
3ab4ee7d | 470 | msg.u.relayd_sock.relayd_session_id); |
00e2e675 DG |
471 | goto end_nosignal; |
472 | } | |
3bd1e081 MD |
473 | case LTTNG_CONSUMER_ADD_CHANNEL: |
474 | { | |
475 | struct lttng_consumer_channel *new_channel; | |
e43c41c5 | 476 | int ret_recv; |
3bd1e081 | 477 | |
9ce5646a MD |
478 | health_code_update(); |
479 | ||
f50f23d9 DG |
480 | /* First send a status message before receiving the fds. */ |
481 | ret = consumer_send_status_msg(sock, ret_code); | |
482 | if (ret < 0) { | |
483 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 484 | goto error_fatal; |
f50f23d9 | 485 | } |
9ce5646a MD |
486 | |
487 | health_code_update(); | |
488 | ||
d88aee68 | 489 | DBG("consumer_add_channel %" PRIu64, msg.u.channel.channel_key); |
3bd1e081 | 490 | new_channel = consumer_allocate_channel(msg.u.channel.channel_key, |
ffe60014 DG |
491 | msg.u.channel.session_id, msg.u.channel.pathname, |
492 | msg.u.channel.name, msg.u.channel.uid, msg.u.channel.gid, | |
1624d5b7 JD |
493 | msg.u.channel.relayd_id, msg.u.channel.output, |
494 | msg.u.channel.tracefile_size, | |
1950109e | 495 | msg.u.channel.tracefile_count, 0, |
ecc48a90 | 496 | msg.u.channel.monitor, |
d7ba1388 | 497 | msg.u.channel.live_timer_interval, |
3d071855 | 498 | NULL, NULL); |
3bd1e081 | 499 | if (new_channel == NULL) { |
f73fabfd | 500 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
3bd1e081 MD |
501 | goto end_nosignal; |
502 | } | |
ffe60014 | 503 | new_channel->nb_init_stream_left = msg.u.channel.nb_init_streams; |
95a1109b JD |
504 | switch (msg.u.channel.output) { |
505 | case LTTNG_EVENT_SPLICE: | |
506 | new_channel->output = CONSUMER_CHANNEL_SPLICE; | |
507 | break; | |
508 | case LTTNG_EVENT_MMAP: | |
509 | new_channel->output = CONSUMER_CHANNEL_MMAP; | |
510 | break; | |
511 | default: | |
512 | ERR("Channel output unknown %d", msg.u.channel.output); | |
513 | goto end_nosignal; | |
514 | } | |
ffe60014 DG |
515 | |
516 | /* Translate and save channel type. */ | |
517 | switch (msg.u.channel.type) { | |
518 | case CONSUMER_CHANNEL_TYPE_DATA: | |
519 | case CONSUMER_CHANNEL_TYPE_METADATA: | |
520 | new_channel->type = msg.u.channel.type; | |
521 | break; | |
522 | default: | |
523 | assert(0); | |
524 | goto end_nosignal; | |
525 | }; | |
526 | ||
9ce5646a MD |
527 | health_code_update(); |
528 | ||
3bd1e081 | 529 | if (ctx->on_recv_channel != NULL) { |
e43c41c5 JD |
530 | ret_recv = ctx->on_recv_channel(new_channel); |
531 | if (ret_recv == 0) { | |
532 | ret = consumer_add_channel(new_channel, ctx); | |
533 | } else if (ret_recv < 0) { | |
3bd1e081 MD |
534 | goto end_nosignal; |
535 | } | |
536 | } else { | |
e43c41c5 | 537 | ret = consumer_add_channel(new_channel, ctx); |
3bd1e081 | 538 | } |
e9404c27 JG |
539 | if (msg.u.channel.type == CONSUMER_CHANNEL_TYPE_DATA && !ret) { |
540 | int monitor_start_ret; | |
541 | ||
542 | DBG("Consumer starting monitor timer"); | |
94d49140 JD |
543 | consumer_timer_live_start(new_channel, |
544 | msg.u.channel.live_timer_interval); | |
e9404c27 JG |
545 | monitor_start_ret = consumer_timer_monitor_start( |
546 | new_channel, | |
547 | msg.u.channel.monitor_timer_interval); | |
548 | if (monitor_start_ret < 0) { | |
549 | ERR("Starting channel monitoring timer failed"); | |
550 | goto end_nosignal; | |
551 | } | |
552 | ||
94d49140 | 553 | } |
e43c41c5 | 554 | |
9ce5646a MD |
555 | health_code_update(); |
556 | ||
e43c41c5 | 557 | /* If we received an error in add_channel, we need to report it. */ |
821fffb2 | 558 | if (ret < 0) { |
1803a064 MD |
559 | ret = consumer_send_status_msg(sock, ret); |
560 | if (ret < 0) { | |
561 | goto error_fatal; | |
562 | } | |
e43c41c5 JD |
563 | goto end_nosignal; |
564 | } | |
565 | ||
3bd1e081 MD |
566 | goto end_nosignal; |
567 | } | |
568 | case LTTNG_CONSUMER_ADD_STREAM: | |
569 | { | |
dae10966 DG |
570 | int fd; |
571 | struct lttng_pipe *stream_pipe; | |
00e2e675 | 572 | struct lttng_consumer_stream *new_stream; |
ffe60014 | 573 | struct lttng_consumer_channel *channel; |
c80048c6 | 574 | int alloc_ret = 0; |
3bd1e081 | 575 | |
ffe60014 DG |
576 | /* |
577 | * Get stream's channel reference. Needed when adding the stream to the | |
578 | * global hash table. | |
579 | */ | |
580 | channel = consumer_find_channel(msg.u.stream.channel_key); | |
581 | if (!channel) { | |
582 | /* | |
583 | * We could not find the channel. Can happen if cpu hotplug | |
584 | * happens while tearing down. | |
585 | */ | |
d88aee68 | 586 | ERR("Unable to find channel key %" PRIu64, msg.u.stream.channel_key); |
e462382a | 587 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
ffe60014 DG |
588 | } |
589 | ||
9ce5646a MD |
590 | health_code_update(); |
591 | ||
f50f23d9 DG |
592 | /* First send a status message before receiving the fds. */ |
593 | ret = consumer_send_status_msg(sock, ret_code); | |
1803a064 | 594 | if (ret < 0) { |
d771f832 | 595 | /* Somehow, the session daemon is not responding anymore. */ |
1803a064 MD |
596 | goto error_fatal; |
597 | } | |
9ce5646a MD |
598 | |
599 | health_code_update(); | |
600 | ||
0c759fc9 | 601 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
d771f832 | 602 | /* Channel was not found. */ |
f50f23d9 DG |
603 | goto end_nosignal; |
604 | } | |
605 | ||
d771f832 | 606 | /* Blocking call */ |
9ce5646a MD |
607 | health_poll_entry(); |
608 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
609 | health_poll_exit(); | |
84382d49 MD |
610 | if (ret) { |
611 | goto error_fatal; | |
3bd1e081 | 612 | } |
00e2e675 | 613 | |
9ce5646a MD |
614 | health_code_update(); |
615 | ||
00e2e675 | 616 | /* Get stream file descriptor from socket */ |
f2fc6720 MD |
617 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); |
618 | if (ret != sizeof(fd)) { | |
f73fabfd | 619 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
3f8e211f | 620 | rcu_read_unlock(); |
3bd1e081 MD |
621 | return ret; |
622 | } | |
3bd1e081 | 623 | |
9ce5646a MD |
624 | health_code_update(); |
625 | ||
f50f23d9 DG |
626 | /* |
627 | * Send status code to session daemon only if the recv works. If the | |
628 | * above recv() failed, the session daemon is notified through the | |
629 | * error socket and the teardown is eventually done. | |
630 | */ | |
631 | ret = consumer_send_status_msg(sock, ret_code); | |
632 | if (ret < 0) { | |
633 | /* Somehow, the session daemon is not responding anymore. */ | |
634 | goto end_nosignal; | |
635 | } | |
636 | ||
9ce5646a MD |
637 | health_code_update(); |
638 | ||
ffe60014 DG |
639 | new_stream = consumer_allocate_stream(channel->key, |
640 | fd, | |
641 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
642 | channel->name, | |
643 | channel->uid, | |
644 | channel->gid, | |
645 | channel->relayd_id, | |
646 | channel->session_id, | |
647 | msg.u.stream.cpu, | |
648 | &alloc_ret, | |
4891ece8 DG |
649 | channel->type, |
650 | channel->monitor); | |
3bd1e081 | 651 | if (new_stream == NULL) { |
c80048c6 MD |
652 | switch (alloc_ret) { |
653 | case -ENOMEM: | |
654 | case -EINVAL: | |
655 | default: | |
656 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
657 | break; | |
c80048c6 | 658 | } |
3f8e211f | 659 | goto end_nosignal; |
3bd1e081 | 660 | } |
d771f832 | 661 | |
ffe60014 DG |
662 | new_stream->chan = channel; |
663 | new_stream->wait_fd = fd; | |
07b86b52 JD |
664 | switch (channel->output) { |
665 | case CONSUMER_CHANNEL_SPLICE: | |
666 | new_stream->output = LTTNG_EVENT_SPLICE; | |
a2361a61 JD |
667 | ret = utils_create_pipe(new_stream->splice_pipe); |
668 | if (ret < 0) { | |
669 | goto end_nosignal; | |
670 | } | |
07b86b52 JD |
671 | break; |
672 | case CONSUMER_CHANNEL_MMAP: | |
673 | new_stream->output = LTTNG_EVENT_MMAP; | |
674 | break; | |
675 | default: | |
676 | ERR("Stream output unknown %d", channel->output); | |
677 | goto end_nosignal; | |
678 | } | |
00e2e675 | 679 | |
a0c83db9 DG |
680 | /* |
681 | * We've just assigned the channel to the stream so increment the | |
07b86b52 JD |
682 | * refcount right now. We don't need to increment the refcount for |
683 | * streams in no monitor because we handle manually the cleanup of | |
684 | * those. It is very important to make sure there is NO prior | |
685 | * consumer_del_stream() calls or else the refcount will be unbalanced. | |
a0c83db9 | 686 | */ |
07b86b52 JD |
687 | if (channel->monitor) { |
688 | uatomic_inc(&new_stream->chan->refcount); | |
689 | } | |
9d9353f9 | 690 | |
fb3a43a9 DG |
691 | /* |
692 | * The buffer flush is done on the session daemon side for the kernel | |
693 | * so no need for the stream "hangup_flush_done" variable to be | |
694 | * tracked. This is important for a kernel stream since we don't rely | |
695 | * on the flush state of the stream to read data. It's not the case for | |
696 | * user space tracing. | |
697 | */ | |
698 | new_stream->hangup_flush_done = 0; | |
699 | ||
9ce5646a MD |
700 | health_code_update(); |
701 | ||
633d0084 DG |
702 | if (ctx->on_recv_stream) { |
703 | ret = ctx->on_recv_stream(new_stream); | |
704 | if (ret < 0) { | |
d771f832 | 705 | consumer_stream_free(new_stream); |
633d0084 | 706 | goto end_nosignal; |
fb3a43a9 | 707 | } |
633d0084 | 708 | } |
fb3a43a9 | 709 | |
9ce5646a MD |
710 | health_code_update(); |
711 | ||
07b86b52 JD |
712 | if (new_stream->metadata_flag) { |
713 | channel->metadata_stream = new_stream; | |
714 | } | |
715 | ||
2bba9e53 DG |
716 | /* Do not monitor this stream. */ |
717 | if (!channel->monitor) { | |
5eecee74 | 718 | DBG("Kernel consumer add stream %s in no monitor mode with " |
6dc3064a | 719 | "relayd id %" PRIu64, new_stream->name, |
5eecee74 | 720 | new_stream->net_seq_idx); |
10a50311 | 721 | cds_list_add(&new_stream->send_node, &channel->streams.head); |
6dc3064a DG |
722 | break; |
723 | } | |
724 | ||
e1b71bdc DG |
725 | /* Send stream to relayd if the stream has an ID. */ |
726 | if (new_stream->net_seq_idx != (uint64_t) -1ULL) { | |
194ee077 DG |
727 | ret = consumer_send_relayd_stream(new_stream, |
728 | new_stream->chan->pathname); | |
e1b71bdc DG |
729 | if (ret < 0) { |
730 | consumer_stream_free(new_stream); | |
731 | goto end_nosignal; | |
732 | } | |
1bf914e0 MD |
733 | |
734 | /* | |
735 | * If adding an extra stream to an already | |
736 | * existing channel (e.g. cpu hotplug), we need | |
737 | * to send the "streams_sent" command to relayd. | |
738 | */ | |
739 | if (channel->streams_sent_to_relayd) { | |
740 | ret = consumer_send_relayd_streams_sent( | |
741 | new_stream->net_seq_idx); | |
742 | if (ret < 0) { | |
743 | goto end_nosignal; | |
744 | } | |
745 | } | |
e2039c7a JD |
746 | } |
747 | ||
50f8ae69 | 748 | /* Get the right pipe where the stream will be sent. */ |
633d0084 | 749 | if (new_stream->metadata_flag) { |
5ab66908 MD |
750 | ret = consumer_add_metadata_stream(new_stream); |
751 | if (ret) { | |
752 | ERR("Consumer add metadata stream %" PRIu64 " failed. Continuing", | |
753 | new_stream->key); | |
754 | consumer_stream_free(new_stream); | |
755 | goto end_nosignal; | |
756 | } | |
dae10966 | 757 | stream_pipe = ctx->consumer_metadata_pipe; |
3bd1e081 | 758 | } else { |
5ab66908 MD |
759 | ret = consumer_add_data_stream(new_stream); |
760 | if (ret) { | |
761 | ERR("Consumer add stream %" PRIu64 " failed. Continuing", | |
762 | new_stream->key); | |
763 | consumer_stream_free(new_stream); | |
764 | goto end_nosignal; | |
765 | } | |
dae10966 | 766 | stream_pipe = ctx->consumer_data_pipe; |
50f8ae69 DG |
767 | } |
768 | ||
5ab66908 MD |
769 | /* Vitible to other threads */ |
770 | new_stream->globally_visible = 1; | |
771 | ||
9ce5646a MD |
772 | health_code_update(); |
773 | ||
dae10966 | 774 | ret = lttng_pipe_write(stream_pipe, &new_stream, sizeof(new_stream)); |
50f8ae69 | 775 | if (ret < 0) { |
dae10966 | 776 | ERR("Consumer write %s stream to pipe %d", |
50f8ae69 | 777 | new_stream->metadata_flag ? "metadata" : "data", |
dae10966 | 778 | lttng_pipe_get_writefd(stream_pipe)); |
5ab66908 MD |
779 | if (new_stream->metadata_flag) { |
780 | consumer_del_stream_for_metadata(new_stream); | |
781 | } else { | |
782 | consumer_del_stream_for_data(new_stream); | |
783 | } | |
50f8ae69 | 784 | goto end_nosignal; |
3bd1e081 | 785 | } |
00e2e675 | 786 | |
50f8ae69 | 787 | DBG("Kernel consumer ADD_STREAM %s (fd: %d) with relayd id %" PRIu64, |
ffe60014 | 788 | new_stream->name, fd, new_stream->relayd_stream_id); |
3bd1e081 MD |
789 | break; |
790 | } | |
a4baae1b JD |
791 | case LTTNG_CONSUMER_STREAMS_SENT: |
792 | { | |
793 | struct lttng_consumer_channel *channel; | |
794 | ||
795 | /* | |
796 | * Get stream's channel reference. Needed when adding the stream to the | |
797 | * global hash table. | |
798 | */ | |
799 | channel = consumer_find_channel(msg.u.sent_streams.channel_key); | |
800 | if (!channel) { | |
801 | /* | |
802 | * We could not find the channel. Can happen if cpu hotplug | |
803 | * happens while tearing down. | |
804 | */ | |
805 | ERR("Unable to find channel key %" PRIu64, | |
806 | msg.u.sent_streams.channel_key); | |
e462382a | 807 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
a4baae1b JD |
808 | } |
809 | ||
810 | health_code_update(); | |
811 | ||
812 | /* | |
813 | * Send status code to session daemon. | |
814 | */ | |
815 | ret = consumer_send_status_msg(sock, ret_code); | |
f261ad0a | 816 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
a4baae1b JD |
817 | /* Somehow, the session daemon is not responding anymore. */ |
818 | goto end_nosignal; | |
819 | } | |
820 | ||
821 | health_code_update(); | |
822 | ||
823 | /* | |
824 | * We should not send this message if we don't monitor the | |
825 | * streams in this channel. | |
826 | */ | |
827 | if (!channel->monitor) { | |
828 | break; | |
829 | } | |
830 | ||
831 | health_code_update(); | |
832 | /* Send stream to relayd if the stream has an ID. */ | |
833 | if (msg.u.sent_streams.net_seq_idx != (uint64_t) -1ULL) { | |
834 | ret = consumer_send_relayd_streams_sent( | |
835 | msg.u.sent_streams.net_seq_idx); | |
836 | if (ret < 0) { | |
837 | goto end_nosignal; | |
838 | } | |
1bf914e0 | 839 | channel->streams_sent_to_relayd = true; |
a4baae1b JD |
840 | } |
841 | break; | |
842 | } | |
3bd1e081 MD |
843 | case LTTNG_CONSUMER_UPDATE_STREAM: |
844 | { | |
3f8e211f DG |
845 | rcu_read_unlock(); |
846 | return -ENOSYS; | |
847 | } | |
848 | case LTTNG_CONSUMER_DESTROY_RELAYD: | |
849 | { | |
a6ba4fe1 | 850 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
3f8e211f DG |
851 | struct consumer_relayd_sock_pair *relayd; |
852 | ||
a6ba4fe1 | 853 | DBG("Kernel consumer destroying relayd %" PRIu64, index); |
3f8e211f DG |
854 | |
855 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 856 | relayd = consumer_find_relayd(index); |
3f8e211f | 857 | if (relayd == NULL) { |
3448e266 | 858 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 859 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
3bd1e081 | 860 | } |
3f8e211f | 861 | |
a6ba4fe1 DG |
862 | /* |
863 | * Each relayd socket pair has a refcount of stream attached to it | |
864 | * which tells if the relayd is still active or not depending on the | |
865 | * refcount value. | |
866 | * | |
867 | * This will set the destroy flag of the relayd object and destroy it | |
868 | * if the refcount reaches zero when called. | |
869 | * | |
870 | * The destroy can happen either here or when a stream fd hangs up. | |
871 | */ | |
f50f23d9 DG |
872 | if (relayd) { |
873 | consumer_flag_relayd_for_destroy(relayd); | |
874 | } | |
875 | ||
9ce5646a MD |
876 | health_code_update(); |
877 | ||
f50f23d9 DG |
878 | ret = consumer_send_status_msg(sock, ret_code); |
879 | if (ret < 0) { | |
880 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 881 | goto error_fatal; |
f50f23d9 | 882 | } |
3f8e211f | 883 | |
3f8e211f | 884 | goto end_nosignal; |
3bd1e081 | 885 | } |
6d805429 | 886 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 887 | { |
c8f59ee5 | 888 | int32_t ret; |
6d805429 | 889 | uint64_t id = msg.u.data_pending.session_id; |
c8f59ee5 | 890 | |
6d805429 | 891 | DBG("Kernel consumer data pending command for id %" PRIu64, id); |
c8f59ee5 | 892 | |
6d805429 | 893 | ret = consumer_data_pending(id); |
c8f59ee5 | 894 | |
9ce5646a MD |
895 | health_code_update(); |
896 | ||
c8f59ee5 DG |
897 | /* Send back returned value to session daemon */ |
898 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
899 | if (ret < 0) { | |
6d805429 | 900 | PERROR("send data pending ret code"); |
1803a064 | 901 | goto error_fatal; |
c8f59ee5 | 902 | } |
f50f23d9 DG |
903 | |
904 | /* | |
905 | * No need to send back a status message since the data pending | |
906 | * returned value is the response. | |
907 | */ | |
c8f59ee5 | 908 | break; |
53632229 | 909 | } |
6dc3064a DG |
910 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
911 | { | |
07b86b52 JD |
912 | if (msg.u.snapshot_channel.metadata == 1) { |
913 | ret = lttng_kconsumer_snapshot_metadata(msg.u.snapshot_channel.key, | |
e2039c7a JD |
914 | msg.u.snapshot_channel.pathname, |
915 | msg.u.snapshot_channel.relayd_id, ctx); | |
07b86b52 JD |
916 | if (ret < 0) { |
917 | ERR("Snapshot metadata failed"); | |
e462382a | 918 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; |
07b86b52 JD |
919 | } |
920 | } else { | |
921 | ret = lttng_kconsumer_snapshot_channel(msg.u.snapshot_channel.key, | |
922 | msg.u.snapshot_channel.pathname, | |
5c786ded | 923 | msg.u.snapshot_channel.relayd_id, |
d07ceecd | 924 | msg.u.snapshot_channel.nb_packets_per_stream, |
5c786ded | 925 | ctx); |
07b86b52 JD |
926 | if (ret < 0) { |
927 | ERR("Snapshot channel failed"); | |
e462382a | 928 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
07b86b52 JD |
929 | } |
930 | } | |
931 | ||
9ce5646a MD |
932 | health_code_update(); |
933 | ||
6dc3064a DG |
934 | ret = consumer_send_status_msg(sock, ret_code); |
935 | if (ret < 0) { | |
936 | /* Somehow, the session daemon is not responding anymore. */ | |
937 | goto end_nosignal; | |
938 | } | |
939 | break; | |
940 | } | |
07b86b52 JD |
941 | case LTTNG_CONSUMER_DESTROY_CHANNEL: |
942 | { | |
943 | uint64_t key = msg.u.destroy_channel.key; | |
944 | struct lttng_consumer_channel *channel; | |
945 | ||
946 | channel = consumer_find_channel(key); | |
947 | if (!channel) { | |
948 | ERR("Kernel consumer destroy channel %" PRIu64 " not found", key); | |
e462382a | 949 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
07b86b52 JD |
950 | } |
951 | ||
9ce5646a MD |
952 | health_code_update(); |
953 | ||
07b86b52 JD |
954 | ret = consumer_send_status_msg(sock, ret_code); |
955 | if (ret < 0) { | |
956 | /* Somehow, the session daemon is not responding anymore. */ | |
957 | goto end_nosignal; | |
958 | } | |
959 | ||
9ce5646a MD |
960 | health_code_update(); |
961 | ||
15dc512a DG |
962 | /* Stop right now if no channel was found. */ |
963 | if (!channel) { | |
964 | goto end_nosignal; | |
965 | } | |
966 | ||
07b86b52 JD |
967 | /* |
968 | * This command should ONLY be issued for channel with streams set in | |
969 | * no monitor mode. | |
970 | */ | |
971 | assert(!channel->monitor); | |
972 | ||
973 | /* | |
974 | * The refcount should ALWAYS be 0 in the case of a channel in no | |
975 | * monitor mode. | |
976 | */ | |
977 | assert(!uatomic_sub_return(&channel->refcount, 1)); | |
978 | ||
979 | consumer_del_channel(channel); | |
980 | ||
981 | goto end_nosignal; | |
982 | } | |
fb83fe64 JD |
983 | case LTTNG_CONSUMER_DISCARDED_EVENTS: |
984 | { | |
2aeac147 JD |
985 | ssize_t ret; |
986 | uint64_t count; | |
fb83fe64 JD |
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); | |
2aeac147 | 998 | count = 0; |
e5742757 | 999 | } else { |
2aeac147 | 1000 | count = channel->discarded_events; |
fb83fe64 JD |
1001 | } |
1002 | ||
fb83fe64 JD |
1003 | health_code_update(); |
1004 | ||
1005 | /* Send back returned value to session daemon */ | |
2aeac147 | 1006 | ret = lttcomm_send_unix_sock(sock, &count, sizeof(count)); |
fb83fe64 JD |
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 | { | |
2aeac147 JD |
1016 | ssize_t ret; |
1017 | uint64_t count; | |
fb83fe64 JD |
1018 | struct lttng_consumer_channel *channel; |
1019 | uint64_t id = msg.u.lost_packets.session_id; | |
1020 | uint64_t key = msg.u.lost_packets.channel_key; | |
1021 | ||
e5742757 MD |
1022 | DBG("Kernel consumer lost packets command for session id %" |
1023 | PRIu64 ", channel key %" PRIu64, id, key); | |
1024 | ||
fb83fe64 JD |
1025 | channel = consumer_find_channel(key); |
1026 | if (!channel) { | |
1027 | ERR("Kernel consumer lost packets channel %" | |
1028 | PRIu64 " not found", key); | |
2aeac147 | 1029 | count = 0; |
e5742757 | 1030 | } else { |
2aeac147 | 1031 | count = channel->lost_packets; |
fb83fe64 JD |
1032 | } |
1033 | ||
fb83fe64 JD |
1034 | health_code_update(); |
1035 | ||
1036 | /* Send back returned value to session daemon */ | |
2aeac147 | 1037 | ret = lttcomm_send_unix_sock(sock, &count, sizeof(count)); |
fb83fe64 JD |
1038 | if (ret < 0) { |
1039 | PERROR("send lost packets"); | |
1040 | goto error_fatal; | |
1041 | } | |
1042 | ||
1043 | break; | |
1044 | } | |
b3530820 JG |
1045 | case LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE: |
1046 | { | |
1047 | int channel_monitor_pipe; | |
1048 | ||
1049 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1050 | /* Successfully received the command's type. */ | |
1051 | ret = consumer_send_status_msg(sock, ret_code); | |
1052 | if (ret < 0) { | |
1053 | goto error_fatal; | |
1054 | } | |
1055 | ||
1056 | ret = lttcomm_recv_fds_unix_sock(sock, &channel_monitor_pipe, | |
1057 | 1); | |
1058 | if (ret != sizeof(channel_monitor_pipe)) { | |
1059 | ERR("Failed to receive channel monitor pipe"); | |
1060 | goto error_fatal; | |
1061 | } | |
1062 | ||
1063 | DBG("Received channel monitor pipe (%d)", channel_monitor_pipe); | |
1064 | ret = consumer_timer_thread_set_channel_monitor_pipe( | |
1065 | channel_monitor_pipe); | |
1066 | if (!ret) { | |
1067 | int flags; | |
1068 | ||
1069 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1070 | /* Set the pipe as non-blocking. */ | |
1071 | ret = fcntl(channel_monitor_pipe, F_GETFL, 0); | |
1072 | if (ret == -1) { | |
1073 | PERROR("fcntl get flags of the channel monitoring pipe"); | |
1074 | goto error_fatal; | |
1075 | } | |
1076 | flags = ret; | |
1077 | ||
1078 | ret = fcntl(channel_monitor_pipe, F_SETFL, | |
1079 | flags | O_NONBLOCK); | |
1080 | if (ret == -1) { | |
1081 | PERROR("fcntl set O_NONBLOCK flag of the channel monitoring pipe"); | |
1082 | goto error_fatal; | |
1083 | } | |
1084 | DBG("Channel monitor pipe set as non-blocking"); | |
1085 | } else { | |
1086 | ret_code = LTTCOMM_CONSUMERD_ALREADY_SET; | |
1087 | } | |
1088 | ret = consumer_send_status_msg(sock, ret_code); | |
1089 | if (ret < 0) { | |
1090 | goto error_fatal; | |
1091 | } | |
1092 | break; | |
1093 | } | |
3bd1e081 | 1094 | default: |
3f8e211f | 1095 | goto end_nosignal; |
3bd1e081 | 1096 | } |
3f8e211f | 1097 | |
3bd1e081 | 1098 | end_nosignal: |
b0b335c8 | 1099 | rcu_read_unlock(); |
4cbc1a04 DG |
1100 | |
1101 | /* | |
1102 | * Return 1 to indicate success since the 0 value can be a socket | |
1103 | * shutdown during the recv() or send() call. | |
1104 | */ | |
9ce5646a | 1105 | health_code_update(); |
4cbc1a04 | 1106 | return 1; |
1803a064 MD |
1107 | |
1108 | error_fatal: | |
1109 | rcu_read_unlock(); | |
1110 | /* This will issue a consumer stop. */ | |
1111 | return -1; | |
3bd1e081 | 1112 | } |
d41f73b7 | 1113 | |
309167d2 JD |
1114 | /* |
1115 | * Populate index values of a kernel stream. Values are set in big endian order. | |
1116 | * | |
1117 | * Return 0 on success or else a negative value. | |
1118 | */ | |
50adc264 | 1119 | static int get_index_values(struct ctf_packet_index *index, int infd) |
309167d2 JD |
1120 | { |
1121 | int ret; | |
1122 | ||
1123 | ret = kernctl_get_timestamp_begin(infd, &index->timestamp_begin); | |
1124 | if (ret < 0) { | |
1125 | PERROR("kernctl_get_timestamp_begin"); | |
1126 | goto error; | |
1127 | } | |
1128 | index->timestamp_begin = htobe64(index->timestamp_begin); | |
1129 | ||
1130 | ret = kernctl_get_timestamp_end(infd, &index->timestamp_end); | |
1131 | if (ret < 0) { | |
1132 | PERROR("kernctl_get_timestamp_end"); | |
1133 | goto error; | |
1134 | } | |
1135 | index->timestamp_end = htobe64(index->timestamp_end); | |
1136 | ||
1137 | ret = kernctl_get_events_discarded(infd, &index->events_discarded); | |
1138 | if (ret < 0) { | |
1139 | PERROR("kernctl_get_events_discarded"); | |
1140 | goto error; | |
1141 | } | |
1142 | index->events_discarded = htobe64(index->events_discarded); | |
1143 | ||
1144 | ret = kernctl_get_content_size(infd, &index->content_size); | |
1145 | if (ret < 0) { | |
1146 | PERROR("kernctl_get_content_size"); | |
1147 | goto error; | |
1148 | } | |
1149 | index->content_size = htobe64(index->content_size); | |
1150 | ||
1151 | ret = kernctl_get_packet_size(infd, &index->packet_size); | |
1152 | if (ret < 0) { | |
1153 | PERROR("kernctl_get_packet_size"); | |
1154 | goto error; | |
1155 | } | |
1156 | index->packet_size = htobe64(index->packet_size); | |
1157 | ||
1158 | ret = kernctl_get_stream_id(infd, &index->stream_id); | |
1159 | if (ret < 0) { | |
1160 | PERROR("kernctl_get_stream_id"); | |
1161 | goto error; | |
1162 | } | |
1163 | index->stream_id = htobe64(index->stream_id); | |
1164 | ||
234cd636 JD |
1165 | ret = kernctl_get_instance_id(infd, &index->stream_instance_id); |
1166 | if (ret < 0) { | |
f0b03c22 MD |
1167 | if (ret == -ENOTTY) { |
1168 | /* Command not implemented by lttng-modules. */ | |
1169 | index->stream_instance_id = -1ULL; | |
f0b03c22 MD |
1170 | } else { |
1171 | PERROR("kernctl_get_instance_id"); | |
1172 | goto error; | |
1173 | } | |
234cd636 JD |
1174 | } |
1175 | index->stream_instance_id = htobe64(index->stream_instance_id); | |
1176 | ||
1177 | ret = kernctl_get_sequence_number(infd, &index->packet_seq_num); | |
1178 | if (ret < 0) { | |
f0b03c22 MD |
1179 | if (ret == -ENOTTY) { |
1180 | /* Command not implemented by lttng-modules. */ | |
1181 | index->packet_seq_num = -1ULL; | |
1182 | ret = 0; | |
1183 | } else { | |
1184 | PERROR("kernctl_get_sequence_number"); | |
1185 | goto error; | |
1186 | } | |
234cd636 JD |
1187 | } |
1188 | index->packet_seq_num = htobe64(index->packet_seq_num); | |
1189 | ||
309167d2 JD |
1190 | error: |
1191 | return ret; | |
1192 | } | |
94d49140 JD |
1193 | /* |
1194 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
1195 | * metadata thread can consumer them. | |
1196 | * | |
1197 | * Metadata stream lock MUST be acquired. | |
1198 | * | |
1199 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream | |
1200 | * is empty or a negative value on error. | |
1201 | */ | |
1202 | int lttng_kconsumer_sync_metadata(struct lttng_consumer_stream *metadata) | |
1203 | { | |
1204 | int ret; | |
1205 | ||
1206 | assert(metadata); | |
1207 | ||
1208 | ret = kernctl_buffer_flush(metadata->wait_fd); | |
1209 | if (ret < 0) { | |
1210 | ERR("Failed to flush kernel stream"); | |
1211 | goto end; | |
1212 | } | |
1213 | ||
1214 | ret = kernctl_snapshot(metadata->wait_fd); | |
1215 | if (ret < 0) { | |
32af2c95 | 1216 | if (ret != -EAGAIN) { |
94d49140 JD |
1217 | ERR("Sync metadata, taking kernel snapshot failed."); |
1218 | goto end; | |
1219 | } | |
1220 | DBG("Sync metadata, no new kernel metadata"); | |
1221 | /* No new metadata, exit. */ | |
1222 | ret = ENODATA; | |
1223 | goto end; | |
1224 | } | |
1225 | ||
1226 | end: | |
1227 | return ret; | |
1228 | } | |
309167d2 | 1229 | |
fb83fe64 JD |
1230 | static |
1231 | int update_stream_stats(struct lttng_consumer_stream *stream) | |
1232 | { | |
1233 | int ret; | |
1234 | uint64_t seq, discarded; | |
1235 | ||
1236 | ret = kernctl_get_sequence_number(stream->wait_fd, &seq); | |
1237 | if (ret < 0) { | |
f0b03c22 MD |
1238 | if (ret == -ENOTTY) { |
1239 | /* Command not implemented by lttng-modules. */ | |
1240 | seq = -1ULL; | |
f0b03c22 MD |
1241 | } else { |
1242 | PERROR("kernctl_get_sequence_number"); | |
1243 | goto end; | |
1244 | } | |
fb83fe64 JD |
1245 | } |
1246 | ||
1247 | /* | |
1248 | * Start the sequence when we extract the first packet in case we don't | |
1249 | * start at 0 (for example if a consumer is not connected to the | |
1250 | * session immediately after the beginning). | |
1251 | */ | |
1252 | if (stream->last_sequence_number == -1ULL) { | |
1253 | stream->last_sequence_number = seq; | |
1254 | } else if (seq > stream->last_sequence_number) { | |
1255 | stream->chan->lost_packets += seq - | |
1256 | stream->last_sequence_number - 1; | |
1257 | } else { | |
1258 | /* seq <= last_sequence_number */ | |
1259 | ERR("Sequence number inconsistent : prev = %" PRIu64 | |
1260 | ", current = %" PRIu64, | |
1261 | stream->last_sequence_number, seq); | |
1262 | ret = -1; | |
1263 | goto end; | |
1264 | } | |
1265 | stream->last_sequence_number = seq; | |
1266 | ||
1267 | ret = kernctl_get_events_discarded(stream->wait_fd, &discarded); | |
1268 | if (ret < 0) { | |
1269 | PERROR("kernctl_get_events_discarded"); | |
1270 | goto end; | |
1271 | } | |
1272 | if (discarded < stream->last_discarded_events) { | |
1273 | /* | |
83f4233d MJ |
1274 | * Overflow has occurred. We assume only one wrap-around |
1275 | * has occurred. | |
fb83fe64 JD |
1276 | */ |
1277 | stream->chan->discarded_events += (1ULL << (CAA_BITS_PER_LONG - 1)) - | |
1278 | stream->last_discarded_events + discarded; | |
1279 | } else { | |
1280 | stream->chan->discarded_events += discarded - | |
1281 | stream->last_discarded_events; | |
1282 | } | |
1283 | stream->last_discarded_events = discarded; | |
1284 | ret = 0; | |
1285 | ||
1286 | end: | |
1287 | return ret; | |
1288 | } | |
1289 | ||
93ec662e JD |
1290 | /* |
1291 | * Check if the local version of the metadata stream matches with the version | |
1292 | * of the metadata stream in the kernel. If it was updated, set the reset flag | |
1293 | * on the stream. | |
1294 | */ | |
1295 | static | |
1296 | int metadata_stream_check_version(int infd, struct lttng_consumer_stream *stream) | |
1297 | { | |
1298 | int ret; | |
1299 | uint64_t cur_version; | |
1300 | ||
1301 | ret = kernctl_get_metadata_version(infd, &cur_version); | |
1302 | if (ret < 0) { | |
f0b03c22 MD |
1303 | if (ret == -ENOTTY) { |
1304 | /* | |
1305 | * LTTng-modules does not implement this | |
1306 | * command. | |
1307 | */ | |
1308 | ret = 0; | |
1309 | goto end; | |
1310 | } | |
93ec662e JD |
1311 | ERR("Failed to get the metadata version"); |
1312 | goto end; | |
1313 | } | |
1314 | ||
1315 | if (stream->metadata_version == cur_version) { | |
1316 | ret = 0; | |
1317 | goto end; | |
1318 | } | |
1319 | ||
1320 | DBG("New metadata version detected"); | |
1321 | stream->metadata_version = cur_version; | |
1322 | stream->reset_metadata_flag = 1; | |
1323 | ret = 0; | |
1324 | ||
1325 | end: | |
1326 | return ret; | |
1327 | } | |
1328 | ||
d41f73b7 MD |
1329 | /* |
1330 | * Consume data on a file descriptor and write it on a trace file. | |
1331 | */ | |
4078b776 | 1332 | ssize_t lttng_kconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
1333 | struct lttng_consumer_local_data *ctx) |
1334 | { | |
1d4dfdef | 1335 | unsigned long len, subbuf_size, padding; |
1c20f0e2 | 1336 | int err, write_index = 1; |
4078b776 | 1337 | ssize_t ret = 0; |
d41f73b7 | 1338 | int infd = stream->wait_fd; |
50adc264 | 1339 | struct ctf_packet_index index; |
d41f73b7 MD |
1340 | |
1341 | DBG("In read_subbuffer (infd : %d)", infd); | |
309167d2 | 1342 | |
d41f73b7 MD |
1343 | /* Get the next subbuffer */ |
1344 | err = kernctl_get_next_subbuf(infd); | |
1345 | if (err != 0) { | |
d41f73b7 MD |
1346 | /* |
1347 | * This is a debug message even for single-threaded consumer, | |
1348 | * because poll() have more relaxed criterions than get subbuf, | |
1349 | * so get_subbuf may fail for short race windows where poll() | |
1350 | * would issue wakeups. | |
1351 | */ | |
1352 | DBG("Reserving sub buffer failed (everything is normal, " | |
1353 | "it is due to concurrency)"); | |
32af2c95 | 1354 | ret = err; |
d41f73b7 MD |
1355 | goto end; |
1356 | } | |
1357 | ||
1d4dfdef DG |
1358 | /* Get the full subbuffer size including padding */ |
1359 | err = kernctl_get_padded_subbuf_size(infd, &len); | |
1360 | if (err != 0) { | |
5a510c9f | 1361 | PERROR("Getting sub-buffer len failed."); |
8265f19e MD |
1362 | err = kernctl_put_subbuf(infd); |
1363 | if (err != 0) { | |
32af2c95 | 1364 | if (err == -EFAULT) { |
5a510c9f | 1365 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1366 | } else if (err == -EIO) { |
8265f19e | 1367 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1368 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e | 1369 | } |
32af2c95 | 1370 | ret = err; |
8265f19e MD |
1371 | goto end; |
1372 | } | |
32af2c95 | 1373 | ret = err; |
1d4dfdef DG |
1374 | goto end; |
1375 | } | |
1376 | ||
1c20f0e2 | 1377 | if (!stream->metadata_flag) { |
309167d2 JD |
1378 | ret = get_index_values(&index, infd); |
1379 | if (ret < 0) { | |
8265f19e MD |
1380 | err = kernctl_put_subbuf(infd); |
1381 | if (err != 0) { | |
32af2c95 | 1382 | if (err == -EFAULT) { |
5a510c9f | 1383 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1384 | } else if (err == -EIO) { |
8265f19e | 1385 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1386 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e | 1387 | } |
32af2c95 | 1388 | ret = err; |
8265f19e MD |
1389 | goto end; |
1390 | } | |
309167d2 JD |
1391 | goto end; |
1392 | } | |
fb83fe64 JD |
1393 | ret = update_stream_stats(stream); |
1394 | if (ret < 0) { | |
7b87473d MD |
1395 | err = kernctl_put_subbuf(infd); |
1396 | if (err != 0) { | |
1397 | if (err == -EFAULT) { | |
1398 | PERROR("Error in unreserving sub buffer\n"); | |
1399 | } else if (err == -EIO) { | |
1400 | /* Should never happen with newer LTTng versions */ | |
1401 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
1402 | } | |
1403 | ret = err; | |
1404 | goto end; | |
1405 | } | |
fb83fe64 JD |
1406 | goto end; |
1407 | } | |
1c20f0e2 JD |
1408 | } else { |
1409 | write_index = 0; | |
93ec662e JD |
1410 | ret = metadata_stream_check_version(infd, stream); |
1411 | if (ret < 0) { | |
7b87473d MD |
1412 | err = kernctl_put_subbuf(infd); |
1413 | if (err != 0) { | |
1414 | if (err == -EFAULT) { | |
1415 | PERROR("Error in unreserving sub buffer\n"); | |
1416 | } else if (err == -EIO) { | |
1417 | /* Should never happen with newer LTTng versions */ | |
1418 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
1419 | } | |
1420 | ret = err; | |
1421 | goto end; | |
1422 | } | |
93ec662e JD |
1423 | goto end; |
1424 | } | |
309167d2 JD |
1425 | } |
1426 | ||
ffe60014 | 1427 | switch (stream->chan->output) { |
07b86b52 | 1428 | case CONSUMER_CHANNEL_SPLICE: |
1d4dfdef DG |
1429 | /* |
1430 | * XXX: The lttng-modules splice "actor" does not handle copying | |
1431 | * partial pages hence only using the subbuffer size without the | |
1432 | * padding makes the splice fail. | |
1433 | */ | |
1434 | subbuf_size = len; | |
1435 | padding = 0; | |
1436 | ||
1437 | /* splice the subbuffer to the tracefile */ | |
91dfef6e | 1438 | ret = lttng_consumer_on_read_subbuffer_splice(ctx, stream, subbuf_size, |
309167d2 | 1439 | padding, &index); |
91dfef6e DG |
1440 | /* |
1441 | * XXX: Splice does not support network streaming so the return value | |
1442 | * is simply checked against subbuf_size and not like the mmap() op. | |
1443 | */ | |
1d4dfdef DG |
1444 | if (ret != subbuf_size) { |
1445 | /* | |
1446 | * display the error but continue processing to try | |
1447 | * to release the subbuffer | |
1448 | */ | |
1449 | ERR("Error splicing to tracefile (ret: %zd != len: %lu)", | |
1450 | ret, subbuf_size); | |
309167d2 | 1451 | write_index = 0; |
1d4dfdef DG |
1452 | } |
1453 | break; | |
07b86b52 | 1454 | case CONSUMER_CHANNEL_MMAP: |
1d4dfdef DG |
1455 | /* Get subbuffer size without padding */ |
1456 | err = kernctl_get_subbuf_size(infd, &subbuf_size); | |
1457 | if (err != 0) { | |
5a510c9f | 1458 | PERROR("Getting sub-buffer len failed."); |
8265f19e MD |
1459 | err = kernctl_put_subbuf(infd); |
1460 | if (err != 0) { | |
32af2c95 | 1461 | if (err == -EFAULT) { |
5a510c9f | 1462 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1463 | } else if (err == -EIO) { |
8265f19e | 1464 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1465 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e | 1466 | } |
32af2c95 | 1467 | ret = err; |
8265f19e MD |
1468 | goto end; |
1469 | } | |
32af2c95 | 1470 | ret = err; |
1d4dfdef DG |
1471 | goto end; |
1472 | } | |
47e81c02 | 1473 | |
1d4dfdef DG |
1474 | /* Make sure the tracer is not gone mad on us! */ |
1475 | assert(len >= subbuf_size); | |
1476 | ||
1477 | padding = len - subbuf_size; | |
1478 | ||
1479 | /* write the subbuffer to the tracefile */ | |
91dfef6e | 1480 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, |
309167d2 | 1481 | padding, &index); |
91dfef6e DG |
1482 | /* |
1483 | * The mmap operation should write subbuf_size amount of data when | |
1484 | * network streaming or the full padding (len) size when we are _not_ | |
1485 | * streaming. | |
1486 | */ | |
d88aee68 DG |
1487 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
1488 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
1d4dfdef | 1489 | /* |
91dfef6e | 1490 | * Display the error but continue processing to try to release the |
2336629e DG |
1491 | * subbuffer. This is a DBG statement since this is possible to |
1492 | * happen without being a critical error. | |
1d4dfdef | 1493 | */ |
2336629e | 1494 | DBG("Error writing to tracefile " |
91dfef6e DG |
1495 | "(ret: %zd != len: %lu != subbuf_size: %lu)", |
1496 | ret, len, subbuf_size); | |
309167d2 | 1497 | write_index = 0; |
1d4dfdef DG |
1498 | } |
1499 | break; | |
1500 | default: | |
1501 | ERR("Unknown output method"); | |
56591bac | 1502 | ret = -EPERM; |
d41f73b7 MD |
1503 | } |
1504 | ||
1505 | err = kernctl_put_next_subbuf(infd); | |
1506 | if (err != 0) { | |
32af2c95 | 1507 | if (err == -EFAULT) { |
5a510c9f | 1508 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1509 | } else if (err == -EIO) { |
d41f73b7 | 1510 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1511 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
d41f73b7 | 1512 | } |
32af2c95 | 1513 | ret = err; |
d41f73b7 MD |
1514 | goto end; |
1515 | } | |
1516 | ||
309167d2 | 1517 | /* Write index if needed. */ |
1c20f0e2 JD |
1518 | if (!write_index) { |
1519 | goto end; | |
1520 | } | |
1521 | ||
94d49140 JD |
1522 | if (stream->chan->live_timer_interval && !stream->metadata_flag) { |
1523 | /* | |
1524 | * In live, block until all the metadata is sent. | |
1525 | */ | |
c585821b MD |
1526 | pthread_mutex_lock(&stream->metadata_timer_lock); |
1527 | assert(!stream->missed_metadata_flush); | |
1528 | stream->waiting_on_metadata = true; | |
1529 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1530 | ||
94d49140 | 1531 | err = consumer_stream_sync_metadata(ctx, stream->session_id); |
c585821b MD |
1532 | |
1533 | pthread_mutex_lock(&stream->metadata_timer_lock); | |
1534 | stream->waiting_on_metadata = false; | |
1535 | if (stream->missed_metadata_flush) { | |
1536 | stream->missed_metadata_flush = false; | |
1537 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1538 | (void) consumer_flush_kernel_index(stream); | |
1539 | } else { | |
1540 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1541 | } | |
94d49140 JD |
1542 | if (err < 0) { |
1543 | goto end; | |
1544 | } | |
1545 | } | |
1546 | ||
1c20f0e2 JD |
1547 | err = consumer_stream_write_index(stream, &index); |
1548 | if (err < 0) { | |
1549 | goto end; | |
309167d2 JD |
1550 | } |
1551 | ||
d41f73b7 MD |
1552 | end: |
1553 | return ret; | |
1554 | } | |
1555 | ||
1556 | int lttng_kconsumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
1557 | { | |
1558 | int ret; | |
ffe60014 DG |
1559 | |
1560 | assert(stream); | |
1561 | ||
2bba9e53 DG |
1562 | /* |
1563 | * Don't create anything if this is set for streaming or should not be | |
1564 | * monitored. | |
1565 | */ | |
1566 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { | |
fe4477ee JD |
1567 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
1568 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
309167d2 | 1569 | stream->uid, stream->gid, NULL); |
fe4477ee JD |
1570 | if (ret < 0) { |
1571 | goto error; | |
1572 | } | |
1573 | stream->out_fd = ret; | |
1574 | stream->tracefile_size_current = 0; | |
309167d2 JD |
1575 | |
1576 | if (!stream->metadata_flag) { | |
f8f3885c MD |
1577 | struct lttng_index_file *index_file; |
1578 | ||
1579 | index_file = lttng_index_file_create(stream->chan->pathname, | |
309167d2 JD |
1580 | stream->name, stream->uid, stream->gid, |
1581 | stream->chan->tracefile_size, | |
f8f3885c MD |
1582 | stream->tracefile_count_current, |
1583 | CTF_INDEX_MAJOR, CTF_INDEX_MINOR); | |
1584 | if (!index_file) { | |
309167d2 JD |
1585 | goto error; |
1586 | } | |
1b47ae58 | 1587 | assert(!stream->index_file); |
f8f3885c | 1588 | stream->index_file = index_file; |
309167d2 | 1589 | } |
ffe60014 | 1590 | } |
d41f73b7 | 1591 | |
d41f73b7 MD |
1592 | if (stream->output == LTTNG_EVENT_MMAP) { |
1593 | /* get the len of the mmap region */ | |
1594 | unsigned long mmap_len; | |
1595 | ||
1596 | ret = kernctl_get_mmap_len(stream->wait_fd, &mmap_len); | |
1597 | if (ret != 0) { | |
ffe60014 | 1598 | PERROR("kernctl_get_mmap_len"); |
d41f73b7 MD |
1599 | goto error_close_fd; |
1600 | } | |
1601 | stream->mmap_len = (size_t) mmap_len; | |
1602 | ||
ffe60014 DG |
1603 | stream->mmap_base = mmap(NULL, stream->mmap_len, PROT_READ, |
1604 | MAP_PRIVATE, stream->wait_fd, 0); | |
d41f73b7 | 1605 | if (stream->mmap_base == MAP_FAILED) { |
ffe60014 | 1606 | PERROR("Error mmaping"); |
d41f73b7 MD |
1607 | ret = -1; |
1608 | goto error_close_fd; | |
1609 | } | |
1610 | } | |
1611 | ||
1612 | /* we return 0 to let the library handle the FD internally */ | |
1613 | return 0; | |
1614 | ||
1615 | error_close_fd: | |
2f225ce2 | 1616 | if (stream->out_fd >= 0) { |
d41f73b7 MD |
1617 | int err; |
1618 | ||
1619 | err = close(stream->out_fd); | |
1620 | assert(!err); | |
2f225ce2 | 1621 | stream->out_fd = -1; |
d41f73b7 MD |
1622 | } |
1623 | error: | |
1624 | return ret; | |
1625 | } | |
1626 | ||
ca22feea DG |
1627 | /* |
1628 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
1629 | * stream. Consumer data lock MUST be acquired before calling this function |
1630 | * and the stream lock. | |
ca22feea | 1631 | * |
6d805429 | 1632 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
1633 | * data is available for trace viewer reading. |
1634 | */ | |
6d805429 | 1635 | int lttng_kconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
1636 | { |
1637 | int ret; | |
1638 | ||
1639 | assert(stream); | |
1640 | ||
873b9e9a MD |
1641 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
1642 | ret = 0; | |
1643 | goto end; | |
1644 | } | |
1645 | ||
ca22feea DG |
1646 | ret = kernctl_get_next_subbuf(stream->wait_fd); |
1647 | if (ret == 0) { | |
1648 | /* There is still data so let's put back this subbuffer. */ | |
1649 | ret = kernctl_put_subbuf(stream->wait_fd); | |
1650 | assert(ret == 0); | |
6d805429 | 1651 | ret = 1; /* Data is pending */ |
4e9a4686 | 1652 | goto end; |
ca22feea DG |
1653 | } |
1654 | ||
6d805429 DG |
1655 | /* Data is NOT pending and ready to be read. */ |
1656 | ret = 0; | |
ca22feea | 1657 | |
6efae65e DG |
1658 | end: |
1659 | return ret; | |
ca22feea | 1660 | } |