Commit | Line | Data |
---|---|---|
3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * | |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
3bd1e081 MD |
8 | * |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
3bd1e081 MD |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <assert.h> | |
3bd1e081 MD |
21 | #include <poll.h> |
22 | #include <pthread.h> | |
23 | #include <stdlib.h> | |
24 | #include <string.h> | |
25 | #include <sys/mman.h> | |
26 | #include <sys/socket.h> | |
27 | #include <sys/types.h> | |
77c7c900 | 28 | #include <inttypes.h> |
3bd1e081 | 29 | #include <unistd.h> |
dbb5dfe6 | 30 | #include <sys/stat.h> |
3bd1e081 | 31 | |
51a9e1c7 | 32 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 33 | #include <common/common.h> |
10a8a223 | 34 | #include <common/kernel-ctl/kernel-ctl.h> |
10a8a223 | 35 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 36 | #include <common/sessiond-comm/relayd.h> |
dbb5dfe6 | 37 | #include <common/compat/fcntl.h> |
acdb9057 | 38 | #include <common/pipe.h> |
00e2e675 | 39 | #include <common/relayd/relayd.h> |
fe4477ee | 40 | #include <common/utils.h> |
07b86b52 | 41 | #include <common/consumer-stream.h> |
309167d2 | 42 | #include <common/index/index.h> |
d3e2ba59 | 43 | #include <common/consumer-timer.h> |
0857097f | 44 | |
10a8a223 | 45 | #include "kernel-consumer.h" |
3bd1e081 MD |
46 | |
47 | extern struct lttng_consumer_global_data consumer_data; | |
48 | extern int consumer_poll_timeout; | |
49 | extern volatile int consumer_quit; | |
50 | ||
3bd1e081 MD |
51 | /* |
52 | * Take a snapshot for a specific fd | |
53 | * | |
54 | * Returns 0 on success, < 0 on error | |
55 | */ | |
ffe60014 | 56 | int lttng_kconsumer_take_snapshot(struct lttng_consumer_stream *stream) |
3bd1e081 MD |
57 | { |
58 | int ret = 0; | |
59 | int infd = stream->wait_fd; | |
60 | ||
61 | ret = kernctl_snapshot(infd); | |
62 | if (ret != 0) { | |
3bd1e081 | 63 | perror("Getting sub-buffer snapshot."); |
56591bac | 64 | ret = -errno; |
3bd1e081 MD |
65 | } |
66 | ||
67 | return ret; | |
68 | } | |
69 | ||
70 | /* | |
71 | * Get the produced position | |
72 | * | |
73 | * Returns 0 on success, < 0 on error | |
74 | */ | |
ffe60014 | 75 | int lttng_kconsumer_get_produced_snapshot(struct lttng_consumer_stream *stream, |
3bd1e081 MD |
76 | unsigned long *pos) |
77 | { | |
78 | int ret; | |
79 | int infd = stream->wait_fd; | |
80 | ||
81 | ret = kernctl_snapshot_get_produced(infd, pos); | |
82 | if (ret != 0) { | |
3bd1e081 | 83 | perror("kernctl_snapshot_get_produced"); |
56591bac | 84 | ret = -errno; |
3bd1e081 MD |
85 | } |
86 | ||
87 | return ret; | |
88 | } | |
89 | ||
07b86b52 JD |
90 | /* |
91 | * Get the consumerd position | |
92 | * | |
93 | * Returns 0 on success, < 0 on error | |
94 | */ | |
95 | int lttng_kconsumer_get_consumed_snapshot(struct lttng_consumer_stream *stream, | |
96 | unsigned long *pos) | |
97 | { | |
98 | int ret; | |
99 | int infd = stream->wait_fd; | |
100 | ||
101 | ret = kernctl_snapshot_get_consumed(infd, pos); | |
102 | if (ret != 0) { | |
07b86b52 | 103 | perror("kernctl_snapshot_get_consumed"); |
56591bac | 104 | ret = -errno; |
07b86b52 JD |
105 | } |
106 | ||
107 | return ret; | |
108 | } | |
109 | ||
07b86b52 JD |
110 | /* |
111 | * Take a snapshot of all the stream of a channel | |
112 | * | |
113 | * Returns 0 on success, < 0 on error | |
114 | */ | |
115 | int lttng_kconsumer_snapshot_channel(uint64_t key, char *path, | |
5c786ded JD |
116 | uint64_t relayd_id, uint64_t max_stream_size, |
117 | struct lttng_consumer_local_data *ctx) | |
07b86b52 JD |
118 | { |
119 | int ret; | |
120 | unsigned long consumed_pos, produced_pos; | |
121 | struct lttng_consumer_channel *channel; | |
122 | struct lttng_consumer_stream *stream; | |
123 | ||
6a00837f | 124 | DBG("Kernel consumer snapshot channel %" PRIu64, key); |
07b86b52 JD |
125 | |
126 | rcu_read_lock(); | |
127 | ||
128 | channel = consumer_find_channel(key); | |
129 | if (!channel) { | |
6a00837f | 130 | ERR("No channel found for key %" PRIu64, key); |
07b86b52 JD |
131 | ret = -1; |
132 | goto end; | |
133 | } | |
134 | ||
135 | /* Splice is not supported yet for channel snapshot. */ | |
136 | if (channel->output != CONSUMER_CHANNEL_MMAP) { | |
137 | ERR("Unsupported output %d", channel->output); | |
138 | ret = -1; | |
139 | goto end; | |
140 | } | |
141 | ||
10a50311 | 142 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { |
9ce5646a MD |
143 | |
144 | health_code_update(); | |
145 | ||
07b86b52 JD |
146 | /* |
147 | * Lock stream because we are about to change its state. | |
148 | */ | |
149 | pthread_mutex_lock(&stream->lock); | |
150 | ||
29decac3 DG |
151 | /* |
152 | * Assign the received relayd ID so we can use it for streaming. The streams | |
153 | * are not visible to anyone so this is OK to change it. | |
154 | */ | |
07b86b52 JD |
155 | stream->net_seq_idx = relayd_id; |
156 | channel->relayd_id = relayd_id; | |
157 | if (relayd_id != (uint64_t) -1ULL) { | |
10a50311 | 158 | ret = consumer_send_relayd_stream(stream, path); |
07b86b52 JD |
159 | if (ret < 0) { |
160 | ERR("sending stream to relayd"); | |
161 | goto end_unlock; | |
162 | } | |
07b86b52 JD |
163 | } else { |
164 | ret = utils_create_stream_file(path, stream->name, | |
10a50311 JD |
165 | stream->chan->tracefile_size, |
166 | stream->tracefile_count_current, | |
309167d2 | 167 | stream->uid, stream->gid, NULL); |
07b86b52 JD |
168 | if (ret < 0) { |
169 | ERR("utils_create_stream_file"); | |
170 | goto end_unlock; | |
171 | } | |
172 | ||
173 | stream->out_fd = ret; | |
174 | stream->tracefile_size_current = 0; | |
175 | ||
81ea21bf MD |
176 | DBG("Kernel consumer snapshot stream %s/%s (%" PRIu64 ")", |
177 | path, stream->name, stream->key); | |
07b86b52 JD |
178 | } |
179 | ||
180 | ret = kernctl_buffer_flush(stream->wait_fd); | |
181 | if (ret < 0) { | |
10a50311 | 182 | ERR("Failed to flush kernel stream"); |
56591bac | 183 | ret = -errno; |
07b86b52 JD |
184 | goto end_unlock; |
185 | } | |
186 | ||
187 | ret = lttng_kconsumer_take_snapshot(stream); | |
188 | if (ret < 0) { | |
189 | ERR("Taking kernel snapshot"); | |
190 | goto end_unlock; | |
191 | } | |
192 | ||
193 | ret = lttng_kconsumer_get_produced_snapshot(stream, &produced_pos); | |
194 | if (ret < 0) { | |
195 | ERR("Produced kernel snapshot position"); | |
196 | goto end_unlock; | |
197 | } | |
198 | ||
199 | ret = lttng_kconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
200 | if (ret < 0) { | |
201 | ERR("Consumerd kernel snapshot position"); | |
202 | goto end_unlock; | |
203 | } | |
204 | ||
205 | if (stream->max_sb_size == 0) { | |
206 | ret = kernctl_get_max_subbuf_size(stream->wait_fd, | |
207 | &stream->max_sb_size); | |
208 | if (ret < 0) { | |
209 | ERR("Getting kernel max_sb_size"); | |
56591bac | 210 | ret = -errno; |
07b86b52 JD |
211 | goto end_unlock; |
212 | } | |
213 | } | |
214 | ||
5c786ded JD |
215 | /* |
216 | * The original value is sent back if max stream size is larger than | |
217 | * the possible size of the snapshot. Also, we asume that the session | |
218 | * daemon should never send a maximum stream size that is lower than | |
219 | * subbuffer size. | |
220 | */ | |
221 | consumed_pos = consumer_get_consumed_maxsize(consumed_pos, | |
222 | produced_pos, max_stream_size); | |
223 | ||
07b86b52 JD |
224 | while (consumed_pos < produced_pos) { |
225 | ssize_t read_len; | |
226 | unsigned long len, padded_len; | |
227 | ||
9ce5646a MD |
228 | health_code_update(); |
229 | ||
07b86b52 JD |
230 | DBG("Kernel consumer taking snapshot at pos %lu", consumed_pos); |
231 | ||
232 | ret = kernctl_get_subbuf(stream->wait_fd, &consumed_pos); | |
233 | if (ret < 0) { | |
234 | if (errno != EAGAIN) { | |
235 | PERROR("kernctl_get_subbuf snapshot"); | |
56591bac | 236 | ret = -errno; |
07b86b52 JD |
237 | goto end_unlock; |
238 | } | |
239 | DBG("Kernel consumer get subbuf failed. Skipping it."); | |
240 | consumed_pos += stream->max_sb_size; | |
241 | continue; | |
242 | } | |
243 | ||
244 | ret = kernctl_get_subbuf_size(stream->wait_fd, &len); | |
245 | if (ret < 0) { | |
246 | ERR("Snapshot kernctl_get_subbuf_size"); | |
56591bac | 247 | ret = -errno; |
29decac3 | 248 | goto error_put_subbuf; |
07b86b52 JD |
249 | } |
250 | ||
251 | ret = kernctl_get_padded_subbuf_size(stream->wait_fd, &padded_len); | |
252 | if (ret < 0) { | |
253 | ERR("Snapshot kernctl_get_padded_subbuf_size"); | |
56591bac | 254 | ret = -errno; |
29decac3 | 255 | goto error_put_subbuf; |
07b86b52 JD |
256 | } |
257 | ||
258 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
309167d2 | 259 | padded_len - len, NULL); |
07b86b52 | 260 | /* |
29decac3 DG |
261 | * We write the padded len in local tracefiles but the data len |
262 | * when using a relay. Display the error but continue processing | |
263 | * to try to release the subbuffer. | |
07b86b52 JD |
264 | */ |
265 | if (relayd_id != (uint64_t) -1ULL) { | |
266 | if (read_len != len) { | |
267 | ERR("Error sending to the relay (ret: %zd != len: %lu)", | |
268 | read_len, len); | |
269 | } | |
270 | } else { | |
271 | if (read_len != padded_len) { | |
272 | ERR("Error writing to tracefile (ret: %zd != len: %lu)", | |
273 | read_len, padded_len); | |
274 | } | |
275 | } | |
276 | ||
277 | ret = kernctl_put_subbuf(stream->wait_fd); | |
278 | if (ret < 0) { | |
279 | ERR("Snapshot kernctl_put_subbuf"); | |
56591bac | 280 | ret = -errno; |
07b86b52 JD |
281 | goto end_unlock; |
282 | } | |
283 | consumed_pos += stream->max_sb_size; | |
284 | } | |
285 | ||
286 | if (relayd_id == (uint64_t) -1ULL) { | |
fdf9986c MD |
287 | if (stream->out_fd >= 0) { |
288 | ret = close(stream->out_fd); | |
289 | if (ret < 0) { | |
290 | PERROR("Kernel consumer snapshot close out_fd"); | |
291 | goto end_unlock; | |
292 | } | |
293 | stream->out_fd = -1; | |
07b86b52 | 294 | } |
07b86b52 JD |
295 | } else { |
296 | close_relayd_stream(stream); | |
297 | stream->net_seq_idx = (uint64_t) -1ULL; | |
298 | } | |
299 | pthread_mutex_unlock(&stream->lock); | |
300 | } | |
301 | ||
302 | /* All good! */ | |
303 | ret = 0; | |
304 | goto end; | |
305 | ||
29decac3 DG |
306 | error_put_subbuf: |
307 | ret = kernctl_put_subbuf(stream->wait_fd); | |
308 | if (ret < 0) { | |
56591bac | 309 | ret = -errno; |
29decac3 DG |
310 | ERR("Snapshot kernctl_put_subbuf error path"); |
311 | } | |
07b86b52 JD |
312 | end_unlock: |
313 | pthread_mutex_unlock(&stream->lock); | |
314 | end: | |
315 | rcu_read_unlock(); | |
316 | return ret; | |
317 | } | |
318 | ||
319 | /* | |
320 | * Read the whole metadata available for a snapshot. | |
321 | * | |
322 | * Returns 0 on success, < 0 on error | |
323 | */ | |
324 | int lttng_kconsumer_snapshot_metadata(uint64_t key, char *path, | |
e2039c7a | 325 | uint64_t relayd_id, struct lttng_consumer_local_data *ctx) |
07b86b52 | 326 | { |
d771f832 DG |
327 | int ret, use_relayd = 0; |
328 | ssize_t ret_read; | |
07b86b52 JD |
329 | struct lttng_consumer_channel *metadata_channel; |
330 | struct lttng_consumer_stream *metadata_stream; | |
d771f832 DG |
331 | |
332 | assert(ctx); | |
07b86b52 JD |
333 | |
334 | DBG("Kernel consumer snapshot metadata with key %" PRIu64 " at path %s", | |
335 | key, path); | |
336 | ||
337 | rcu_read_lock(); | |
338 | ||
339 | metadata_channel = consumer_find_channel(key); | |
340 | if (!metadata_channel) { | |
d771f832 | 341 | ERR("Kernel snapshot metadata not found for key %" PRIu64, key); |
07b86b52 | 342 | ret = -1; |
d771f832 | 343 | goto error; |
07b86b52 JD |
344 | } |
345 | ||
346 | metadata_stream = metadata_channel->metadata_stream; | |
347 | assert(metadata_stream); | |
348 | ||
d771f832 | 349 | /* Flag once that we have a valid relayd for the stream. */ |
e2039c7a | 350 | if (relayd_id != (uint64_t) -1ULL) { |
d771f832 DG |
351 | use_relayd = 1; |
352 | } | |
353 | ||
354 | if (use_relayd) { | |
10a50311 | 355 | ret = consumer_send_relayd_stream(metadata_stream, path); |
e2039c7a | 356 | if (ret < 0) { |
d771f832 | 357 | goto error; |
e2039c7a | 358 | } |
e2039c7a JD |
359 | } else { |
360 | ret = utils_create_stream_file(path, metadata_stream->name, | |
361 | metadata_stream->chan->tracefile_size, | |
362 | metadata_stream->tracefile_count_current, | |
309167d2 | 363 | metadata_stream->uid, metadata_stream->gid, NULL); |
e2039c7a | 364 | if (ret < 0) { |
d771f832 | 365 | goto error; |
e2039c7a JD |
366 | } |
367 | metadata_stream->out_fd = ret; | |
07b86b52 | 368 | } |
07b86b52 | 369 | |
d771f832 | 370 | do { |
9ce5646a MD |
371 | health_code_update(); |
372 | ||
d771f832 DG |
373 | ret_read = lttng_kconsumer_read_subbuffer(metadata_stream, ctx); |
374 | if (ret_read < 0) { | |
56591bac | 375 | if (ret_read != -EAGAIN) { |
6a00837f | 376 | ERR("Kernel snapshot reading metadata subbuffer (ret: %zd)", |
d771f832 DG |
377 | ret_read); |
378 | goto error; | |
07b86b52 | 379 | } |
d771f832 | 380 | /* ret_read is negative at this point so we will exit the loop. */ |
07b86b52 JD |
381 | continue; |
382 | } | |
d771f832 | 383 | } while (ret_read >= 0); |
07b86b52 | 384 | |
d771f832 DG |
385 | if (use_relayd) { |
386 | close_relayd_stream(metadata_stream); | |
387 | metadata_stream->net_seq_idx = (uint64_t) -1ULL; | |
388 | } else { | |
fdf9986c MD |
389 | if (metadata_stream->out_fd >= 0) { |
390 | ret = close(metadata_stream->out_fd); | |
391 | if (ret < 0) { | |
392 | PERROR("Kernel consumer snapshot metadata close out_fd"); | |
393 | /* | |
394 | * Don't go on error here since the snapshot was successful at this | |
395 | * point but somehow the close failed. | |
396 | */ | |
397 | } | |
398 | metadata_stream->out_fd = -1; | |
e2039c7a | 399 | } |
e2039c7a JD |
400 | } |
401 | ||
07b86b52 | 402 | ret = 0; |
d771f832 | 403 | |
cf53a8a6 JD |
404 | cds_list_del(&metadata_stream->send_node); |
405 | consumer_stream_destroy(metadata_stream, NULL); | |
406 | metadata_channel->metadata_stream = NULL; | |
d771f832 | 407 | error: |
07b86b52 JD |
408 | rcu_read_unlock(); |
409 | return ret; | |
410 | } | |
411 | ||
1803a064 MD |
412 | /* |
413 | * Receive command from session daemon and process it. | |
414 | * | |
415 | * Return 1 on success else a negative value or 0. | |
416 | */ | |
3bd1e081 MD |
417 | int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
418 | int sock, struct pollfd *consumer_sockpoll) | |
419 | { | |
420 | ssize_t ret; | |
f50f23d9 | 421 | enum lttng_error_code ret_code = LTTNG_OK; |
3bd1e081 MD |
422 | struct lttcomm_consumer_msg msg; |
423 | ||
9ce5646a MD |
424 | health_code_update(); |
425 | ||
3bd1e081 MD |
426 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
427 | if (ret != sizeof(msg)) { | |
1803a064 | 428 | if (ret > 0) { |
c6857fcf | 429 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
1803a064 MD |
430 | ret = -1; |
431 | } | |
3bd1e081 MD |
432 | return ret; |
433 | } | |
9ce5646a MD |
434 | |
435 | health_code_update(); | |
436 | ||
3bd1e081 | 437 | if (msg.cmd_type == LTTNG_CONSUMER_STOP) { |
f50f23d9 DG |
438 | /* |
439 | * Notify the session daemon that the command is completed. | |
440 | * | |
441 | * On transport layer error, the function call will print an error | |
442 | * message so handling the returned code is a bit useless since we | |
443 | * return an error code anyway. | |
444 | */ | |
445 | (void) consumer_send_status_msg(sock, ret_code); | |
3bd1e081 MD |
446 | return -ENOENT; |
447 | } | |
448 | ||
9ce5646a MD |
449 | health_code_update(); |
450 | ||
b0b335c8 MD |
451 | /* relayd needs RCU read-side protection */ |
452 | rcu_read_lock(); | |
453 | ||
3bd1e081 | 454 | switch (msg.cmd_type) { |
00e2e675 DG |
455 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
456 | { | |
f50f23d9 | 457 | /* Session daemon status message are handled in the following call. */ |
7735ef9e DG |
458 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
459 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, | |
d3e2ba59 JD |
460 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
461 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
462 | goto end_nosignal; |
463 | } | |
3bd1e081 MD |
464 | case LTTNG_CONSUMER_ADD_CHANNEL: |
465 | { | |
466 | struct lttng_consumer_channel *new_channel; | |
e43c41c5 | 467 | int ret_recv; |
3bd1e081 | 468 | |
9ce5646a MD |
469 | health_code_update(); |
470 | ||
f50f23d9 DG |
471 | /* First send a status message before receiving the fds. */ |
472 | ret = consumer_send_status_msg(sock, ret_code); | |
473 | if (ret < 0) { | |
474 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 475 | goto error_fatal; |
f50f23d9 | 476 | } |
9ce5646a MD |
477 | |
478 | health_code_update(); | |
479 | ||
d88aee68 | 480 | DBG("consumer_add_channel %" PRIu64, msg.u.channel.channel_key); |
3bd1e081 | 481 | new_channel = consumer_allocate_channel(msg.u.channel.channel_key, |
ffe60014 DG |
482 | msg.u.channel.session_id, msg.u.channel.pathname, |
483 | msg.u.channel.name, msg.u.channel.uid, msg.u.channel.gid, | |
1624d5b7 JD |
484 | msg.u.channel.relayd_id, msg.u.channel.output, |
485 | msg.u.channel.tracefile_size, | |
1950109e | 486 | msg.u.channel.tracefile_count, 0, |
ecc48a90 JD |
487 | msg.u.channel.monitor, |
488 | msg.u.channel.live_timer_interval); | |
3bd1e081 | 489 | if (new_channel == NULL) { |
f73fabfd | 490 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
3bd1e081 MD |
491 | goto end_nosignal; |
492 | } | |
ffe60014 | 493 | new_channel->nb_init_stream_left = msg.u.channel.nb_init_streams; |
95a1109b JD |
494 | switch (msg.u.channel.output) { |
495 | case LTTNG_EVENT_SPLICE: | |
496 | new_channel->output = CONSUMER_CHANNEL_SPLICE; | |
497 | break; | |
498 | case LTTNG_EVENT_MMAP: | |
499 | new_channel->output = CONSUMER_CHANNEL_MMAP; | |
500 | break; | |
501 | default: | |
502 | ERR("Channel output unknown %d", msg.u.channel.output); | |
503 | goto end_nosignal; | |
504 | } | |
ffe60014 DG |
505 | |
506 | /* Translate and save channel type. */ | |
507 | switch (msg.u.channel.type) { | |
508 | case CONSUMER_CHANNEL_TYPE_DATA: | |
509 | case CONSUMER_CHANNEL_TYPE_METADATA: | |
510 | new_channel->type = msg.u.channel.type; | |
511 | break; | |
512 | default: | |
513 | assert(0); | |
514 | goto end_nosignal; | |
515 | }; | |
516 | ||
9ce5646a MD |
517 | health_code_update(); |
518 | ||
3bd1e081 | 519 | if (ctx->on_recv_channel != NULL) { |
e43c41c5 JD |
520 | ret_recv = ctx->on_recv_channel(new_channel); |
521 | if (ret_recv == 0) { | |
522 | ret = consumer_add_channel(new_channel, ctx); | |
523 | } else if (ret_recv < 0) { | |
3bd1e081 MD |
524 | goto end_nosignal; |
525 | } | |
526 | } else { | |
e43c41c5 | 527 | ret = consumer_add_channel(new_channel, ctx); |
3bd1e081 | 528 | } |
94d49140 JD |
529 | if (CONSUMER_CHANNEL_TYPE_DATA) { |
530 | consumer_timer_live_start(new_channel, | |
531 | msg.u.channel.live_timer_interval); | |
532 | } | |
e43c41c5 | 533 | |
9ce5646a MD |
534 | health_code_update(); |
535 | ||
e43c41c5 | 536 | /* If we received an error in add_channel, we need to report it. */ |
821fffb2 | 537 | if (ret < 0) { |
1803a064 MD |
538 | ret = consumer_send_status_msg(sock, ret); |
539 | if (ret < 0) { | |
540 | goto error_fatal; | |
541 | } | |
e43c41c5 JD |
542 | goto end_nosignal; |
543 | } | |
544 | ||
3bd1e081 MD |
545 | goto end_nosignal; |
546 | } | |
547 | case LTTNG_CONSUMER_ADD_STREAM: | |
548 | { | |
dae10966 DG |
549 | int fd; |
550 | struct lttng_pipe *stream_pipe; | |
00e2e675 | 551 | struct lttng_consumer_stream *new_stream; |
ffe60014 | 552 | struct lttng_consumer_channel *channel; |
c80048c6 | 553 | int alloc_ret = 0; |
3bd1e081 | 554 | |
ffe60014 DG |
555 | /* |
556 | * Get stream's channel reference. Needed when adding the stream to the | |
557 | * global hash table. | |
558 | */ | |
559 | channel = consumer_find_channel(msg.u.stream.channel_key); | |
560 | if (!channel) { | |
561 | /* | |
562 | * We could not find the channel. Can happen if cpu hotplug | |
563 | * happens while tearing down. | |
564 | */ | |
d88aee68 | 565 | ERR("Unable to find channel key %" PRIu64, msg.u.stream.channel_key); |
ffe60014 DG |
566 | ret_code = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
567 | } | |
568 | ||
9ce5646a MD |
569 | health_code_update(); |
570 | ||
f50f23d9 DG |
571 | /* First send a status message before receiving the fds. */ |
572 | ret = consumer_send_status_msg(sock, ret_code); | |
1803a064 | 573 | if (ret < 0) { |
d771f832 | 574 | /* Somehow, the session daemon is not responding anymore. */ |
1803a064 MD |
575 | goto error_fatal; |
576 | } | |
9ce5646a MD |
577 | |
578 | health_code_update(); | |
579 | ||
1803a064 | 580 | if (ret_code != LTTNG_OK) { |
d771f832 | 581 | /* Channel was not found. */ |
f50f23d9 DG |
582 | goto end_nosignal; |
583 | } | |
584 | ||
d771f832 | 585 | /* Blocking call */ |
9ce5646a MD |
586 | health_poll_entry(); |
587 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
588 | health_poll_exit(); | |
589 | if (ret < 0) { | |
3f8e211f | 590 | rcu_read_unlock(); |
3bd1e081 MD |
591 | return -EINTR; |
592 | } | |
00e2e675 | 593 | |
9ce5646a MD |
594 | health_code_update(); |
595 | ||
00e2e675 | 596 | /* Get stream file descriptor from socket */ |
f2fc6720 MD |
597 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); |
598 | if (ret != sizeof(fd)) { | |
f73fabfd | 599 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
3f8e211f | 600 | rcu_read_unlock(); |
3bd1e081 MD |
601 | return ret; |
602 | } | |
3bd1e081 | 603 | |
9ce5646a MD |
604 | health_code_update(); |
605 | ||
f50f23d9 DG |
606 | /* |
607 | * Send status code to session daemon only if the recv works. If the | |
608 | * above recv() failed, the session daemon is notified through the | |
609 | * error socket and the teardown is eventually done. | |
610 | */ | |
611 | ret = consumer_send_status_msg(sock, ret_code); | |
612 | if (ret < 0) { | |
613 | /* Somehow, the session daemon is not responding anymore. */ | |
614 | goto end_nosignal; | |
615 | } | |
616 | ||
9ce5646a MD |
617 | health_code_update(); |
618 | ||
ffe60014 DG |
619 | new_stream = consumer_allocate_stream(channel->key, |
620 | fd, | |
621 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
622 | channel->name, | |
623 | channel->uid, | |
624 | channel->gid, | |
625 | channel->relayd_id, | |
626 | channel->session_id, | |
627 | msg.u.stream.cpu, | |
628 | &alloc_ret, | |
4891ece8 DG |
629 | channel->type, |
630 | channel->monitor); | |
3bd1e081 | 631 | if (new_stream == NULL) { |
c80048c6 MD |
632 | switch (alloc_ret) { |
633 | case -ENOMEM: | |
634 | case -EINVAL: | |
635 | default: | |
636 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
637 | break; | |
c80048c6 | 638 | } |
3f8e211f | 639 | goto end_nosignal; |
3bd1e081 | 640 | } |
d771f832 | 641 | |
ffe60014 DG |
642 | new_stream->chan = channel; |
643 | new_stream->wait_fd = fd; | |
07b86b52 JD |
644 | switch (channel->output) { |
645 | case CONSUMER_CHANNEL_SPLICE: | |
646 | new_stream->output = LTTNG_EVENT_SPLICE; | |
647 | break; | |
648 | case CONSUMER_CHANNEL_MMAP: | |
649 | new_stream->output = LTTNG_EVENT_MMAP; | |
650 | break; | |
651 | default: | |
652 | ERR("Stream output unknown %d", channel->output); | |
653 | goto end_nosignal; | |
654 | } | |
00e2e675 | 655 | |
a0c83db9 DG |
656 | /* |
657 | * We've just assigned the channel to the stream so increment the | |
07b86b52 JD |
658 | * refcount right now. We don't need to increment the refcount for |
659 | * streams in no monitor because we handle manually the cleanup of | |
660 | * those. It is very important to make sure there is NO prior | |
661 | * consumer_del_stream() calls or else the refcount will be unbalanced. | |
a0c83db9 | 662 | */ |
07b86b52 JD |
663 | if (channel->monitor) { |
664 | uatomic_inc(&new_stream->chan->refcount); | |
665 | } | |
9d9353f9 | 666 | |
fb3a43a9 DG |
667 | /* |
668 | * The buffer flush is done on the session daemon side for the kernel | |
669 | * so no need for the stream "hangup_flush_done" variable to be | |
670 | * tracked. This is important for a kernel stream since we don't rely | |
671 | * on the flush state of the stream to read data. It's not the case for | |
672 | * user space tracing. | |
673 | */ | |
674 | new_stream->hangup_flush_done = 0; | |
675 | ||
9ce5646a MD |
676 | health_code_update(); |
677 | ||
633d0084 DG |
678 | if (ctx->on_recv_stream) { |
679 | ret = ctx->on_recv_stream(new_stream); | |
680 | if (ret < 0) { | |
d771f832 | 681 | consumer_stream_free(new_stream); |
633d0084 | 682 | goto end_nosignal; |
fb3a43a9 | 683 | } |
633d0084 | 684 | } |
fb3a43a9 | 685 | |
9ce5646a MD |
686 | health_code_update(); |
687 | ||
07b86b52 JD |
688 | if (new_stream->metadata_flag) { |
689 | channel->metadata_stream = new_stream; | |
690 | } | |
691 | ||
2bba9e53 DG |
692 | /* Do not monitor this stream. */ |
693 | if (!channel->monitor) { | |
5eecee74 | 694 | DBG("Kernel consumer add stream %s in no monitor mode with " |
6dc3064a | 695 | "relayd id %" PRIu64, new_stream->name, |
5eecee74 | 696 | new_stream->net_seq_idx); |
10a50311 | 697 | cds_list_add(&new_stream->send_node, &channel->streams.head); |
6dc3064a DG |
698 | break; |
699 | } | |
700 | ||
e1b71bdc DG |
701 | /* Send stream to relayd if the stream has an ID. */ |
702 | if (new_stream->net_seq_idx != (uint64_t) -1ULL) { | |
194ee077 DG |
703 | ret = consumer_send_relayd_stream(new_stream, |
704 | new_stream->chan->pathname); | |
e1b71bdc DG |
705 | if (ret < 0) { |
706 | consumer_stream_free(new_stream); | |
707 | goto end_nosignal; | |
708 | } | |
e2039c7a JD |
709 | } |
710 | ||
50f8ae69 | 711 | /* Get the right pipe where the stream will be sent. */ |
633d0084 | 712 | if (new_stream->metadata_flag) { |
5ab66908 MD |
713 | ret = consumer_add_metadata_stream(new_stream); |
714 | if (ret) { | |
715 | ERR("Consumer add metadata stream %" PRIu64 " failed. Continuing", | |
716 | new_stream->key); | |
717 | consumer_stream_free(new_stream); | |
718 | goto end_nosignal; | |
719 | } | |
dae10966 | 720 | stream_pipe = ctx->consumer_metadata_pipe; |
3bd1e081 | 721 | } else { |
5ab66908 MD |
722 | ret = consumer_add_data_stream(new_stream); |
723 | if (ret) { | |
724 | ERR("Consumer add stream %" PRIu64 " failed. Continuing", | |
725 | new_stream->key); | |
726 | consumer_stream_free(new_stream); | |
727 | goto end_nosignal; | |
728 | } | |
dae10966 | 729 | stream_pipe = ctx->consumer_data_pipe; |
50f8ae69 DG |
730 | } |
731 | ||
5ab66908 MD |
732 | /* Vitible to other threads */ |
733 | new_stream->globally_visible = 1; | |
734 | ||
9ce5646a MD |
735 | health_code_update(); |
736 | ||
dae10966 | 737 | ret = lttng_pipe_write(stream_pipe, &new_stream, sizeof(new_stream)); |
50f8ae69 | 738 | if (ret < 0) { |
dae10966 | 739 | ERR("Consumer write %s stream to pipe %d", |
50f8ae69 | 740 | new_stream->metadata_flag ? "metadata" : "data", |
dae10966 | 741 | lttng_pipe_get_writefd(stream_pipe)); |
5ab66908 MD |
742 | if (new_stream->metadata_flag) { |
743 | consumer_del_stream_for_metadata(new_stream); | |
744 | } else { | |
745 | consumer_del_stream_for_data(new_stream); | |
746 | } | |
50f8ae69 | 747 | goto end_nosignal; |
3bd1e081 | 748 | } |
00e2e675 | 749 | |
50f8ae69 | 750 | DBG("Kernel consumer ADD_STREAM %s (fd: %d) with relayd id %" PRIu64, |
ffe60014 | 751 | new_stream->name, fd, new_stream->relayd_stream_id); |
3bd1e081 MD |
752 | break; |
753 | } | |
754 | case LTTNG_CONSUMER_UPDATE_STREAM: | |
755 | { | |
3f8e211f DG |
756 | rcu_read_unlock(); |
757 | return -ENOSYS; | |
758 | } | |
759 | case LTTNG_CONSUMER_DESTROY_RELAYD: | |
760 | { | |
a6ba4fe1 | 761 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
3f8e211f DG |
762 | struct consumer_relayd_sock_pair *relayd; |
763 | ||
a6ba4fe1 | 764 | DBG("Kernel consumer destroying relayd %" PRIu64, index); |
3f8e211f DG |
765 | |
766 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 767 | relayd = consumer_find_relayd(index); |
3f8e211f | 768 | if (relayd == NULL) { |
3448e266 | 769 | DBG("Unable to find relayd %" PRIu64, index); |
f50f23d9 | 770 | ret_code = LTTNG_ERR_NO_CONSUMER; |
3bd1e081 | 771 | } |
3f8e211f | 772 | |
a6ba4fe1 DG |
773 | /* |
774 | * Each relayd socket pair has a refcount of stream attached to it | |
775 | * which tells if the relayd is still active or not depending on the | |
776 | * refcount value. | |
777 | * | |
778 | * This will set the destroy flag of the relayd object and destroy it | |
779 | * if the refcount reaches zero when called. | |
780 | * | |
781 | * The destroy can happen either here or when a stream fd hangs up. | |
782 | */ | |
f50f23d9 DG |
783 | if (relayd) { |
784 | consumer_flag_relayd_for_destroy(relayd); | |
785 | } | |
786 | ||
9ce5646a MD |
787 | health_code_update(); |
788 | ||
f50f23d9 DG |
789 | ret = consumer_send_status_msg(sock, ret_code); |
790 | if (ret < 0) { | |
791 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 792 | goto error_fatal; |
f50f23d9 | 793 | } |
3f8e211f | 794 | |
3f8e211f | 795 | goto end_nosignal; |
3bd1e081 | 796 | } |
6d805429 | 797 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 798 | { |
c8f59ee5 | 799 | int32_t ret; |
6d805429 | 800 | uint64_t id = msg.u.data_pending.session_id; |
c8f59ee5 | 801 | |
6d805429 | 802 | DBG("Kernel consumer data pending command for id %" PRIu64, id); |
c8f59ee5 | 803 | |
6d805429 | 804 | ret = consumer_data_pending(id); |
c8f59ee5 | 805 | |
9ce5646a MD |
806 | health_code_update(); |
807 | ||
c8f59ee5 DG |
808 | /* Send back returned value to session daemon */ |
809 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
810 | if (ret < 0) { | |
6d805429 | 811 | PERROR("send data pending ret code"); |
1803a064 | 812 | goto error_fatal; |
c8f59ee5 | 813 | } |
f50f23d9 DG |
814 | |
815 | /* | |
816 | * No need to send back a status message since the data pending | |
817 | * returned value is the response. | |
818 | */ | |
c8f59ee5 | 819 | break; |
53632229 | 820 | } |
6dc3064a DG |
821 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
822 | { | |
07b86b52 JD |
823 | if (msg.u.snapshot_channel.metadata == 1) { |
824 | ret = lttng_kconsumer_snapshot_metadata(msg.u.snapshot_channel.key, | |
e2039c7a JD |
825 | msg.u.snapshot_channel.pathname, |
826 | msg.u.snapshot_channel.relayd_id, ctx); | |
07b86b52 JD |
827 | if (ret < 0) { |
828 | ERR("Snapshot metadata failed"); | |
829 | ret_code = LTTNG_ERR_KERN_META_FAIL; | |
830 | } | |
831 | } else { | |
832 | ret = lttng_kconsumer_snapshot_channel(msg.u.snapshot_channel.key, | |
833 | msg.u.snapshot_channel.pathname, | |
5c786ded JD |
834 | msg.u.snapshot_channel.relayd_id, |
835 | msg.u.snapshot_channel.max_stream_size, | |
836 | ctx); | |
07b86b52 JD |
837 | if (ret < 0) { |
838 | ERR("Snapshot channel failed"); | |
839 | ret_code = LTTNG_ERR_KERN_CHAN_FAIL; | |
840 | } | |
841 | } | |
842 | ||
9ce5646a MD |
843 | health_code_update(); |
844 | ||
6dc3064a DG |
845 | ret = consumer_send_status_msg(sock, ret_code); |
846 | if (ret < 0) { | |
847 | /* Somehow, the session daemon is not responding anymore. */ | |
848 | goto end_nosignal; | |
849 | } | |
850 | break; | |
851 | } | |
07b86b52 JD |
852 | case LTTNG_CONSUMER_DESTROY_CHANNEL: |
853 | { | |
854 | uint64_t key = msg.u.destroy_channel.key; | |
855 | struct lttng_consumer_channel *channel; | |
856 | ||
857 | channel = consumer_find_channel(key); | |
858 | if (!channel) { | |
859 | ERR("Kernel consumer destroy channel %" PRIu64 " not found", key); | |
860 | ret_code = LTTNG_ERR_KERN_CHAN_NOT_FOUND; | |
861 | } | |
862 | ||
9ce5646a MD |
863 | health_code_update(); |
864 | ||
07b86b52 JD |
865 | ret = consumer_send_status_msg(sock, ret_code); |
866 | if (ret < 0) { | |
867 | /* Somehow, the session daemon is not responding anymore. */ | |
868 | goto end_nosignal; | |
869 | } | |
870 | ||
9ce5646a MD |
871 | health_code_update(); |
872 | ||
07b86b52 JD |
873 | /* |
874 | * This command should ONLY be issued for channel with streams set in | |
875 | * no monitor mode. | |
876 | */ | |
877 | assert(!channel->monitor); | |
878 | ||
879 | /* | |
880 | * The refcount should ALWAYS be 0 in the case of a channel in no | |
881 | * monitor mode. | |
882 | */ | |
883 | assert(!uatomic_sub_return(&channel->refcount, 1)); | |
884 | ||
885 | consumer_del_channel(channel); | |
886 | ||
887 | goto end_nosignal; | |
888 | } | |
3bd1e081 | 889 | default: |
3f8e211f | 890 | goto end_nosignal; |
3bd1e081 | 891 | } |
3f8e211f | 892 | |
3bd1e081 | 893 | end_nosignal: |
b0b335c8 | 894 | rcu_read_unlock(); |
4cbc1a04 DG |
895 | |
896 | /* | |
897 | * Return 1 to indicate success since the 0 value can be a socket | |
898 | * shutdown during the recv() or send() call. | |
899 | */ | |
9ce5646a | 900 | health_code_update(); |
4cbc1a04 | 901 | return 1; |
1803a064 MD |
902 | |
903 | error_fatal: | |
904 | rcu_read_unlock(); | |
905 | /* This will issue a consumer stop. */ | |
906 | return -1; | |
3bd1e081 | 907 | } |
d41f73b7 | 908 | |
309167d2 JD |
909 | /* |
910 | * Populate index values of a kernel stream. Values are set in big endian order. | |
911 | * | |
912 | * Return 0 on success or else a negative value. | |
913 | */ | |
914 | static int get_index_values(struct lttng_packet_index *index, int infd) | |
915 | { | |
916 | int ret; | |
917 | ||
918 | ret = kernctl_get_timestamp_begin(infd, &index->timestamp_begin); | |
919 | if (ret < 0) { | |
920 | PERROR("kernctl_get_timestamp_begin"); | |
921 | goto error; | |
922 | } | |
923 | index->timestamp_begin = htobe64(index->timestamp_begin); | |
924 | ||
925 | ret = kernctl_get_timestamp_end(infd, &index->timestamp_end); | |
926 | if (ret < 0) { | |
927 | PERROR("kernctl_get_timestamp_end"); | |
928 | goto error; | |
929 | } | |
930 | index->timestamp_end = htobe64(index->timestamp_end); | |
931 | ||
932 | ret = kernctl_get_events_discarded(infd, &index->events_discarded); | |
933 | if (ret < 0) { | |
934 | PERROR("kernctl_get_events_discarded"); | |
935 | goto error; | |
936 | } | |
937 | index->events_discarded = htobe64(index->events_discarded); | |
938 | ||
939 | ret = kernctl_get_content_size(infd, &index->content_size); | |
940 | if (ret < 0) { | |
941 | PERROR("kernctl_get_content_size"); | |
942 | goto error; | |
943 | } | |
944 | index->content_size = htobe64(index->content_size); | |
945 | ||
946 | ret = kernctl_get_packet_size(infd, &index->packet_size); | |
947 | if (ret < 0) { | |
948 | PERROR("kernctl_get_packet_size"); | |
949 | goto error; | |
950 | } | |
951 | index->packet_size = htobe64(index->packet_size); | |
952 | ||
953 | ret = kernctl_get_stream_id(infd, &index->stream_id); | |
954 | if (ret < 0) { | |
955 | PERROR("kernctl_get_stream_id"); | |
956 | goto error; | |
957 | } | |
958 | index->stream_id = htobe64(index->stream_id); | |
959 | ||
960 | error: | |
961 | return ret; | |
962 | } | |
94d49140 JD |
963 | /* |
964 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
965 | * metadata thread can consumer them. | |
966 | * | |
967 | * Metadata stream lock MUST be acquired. | |
968 | * | |
969 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream | |
970 | * is empty or a negative value on error. | |
971 | */ | |
972 | int lttng_kconsumer_sync_metadata(struct lttng_consumer_stream *metadata) | |
973 | { | |
974 | int ret; | |
975 | ||
976 | assert(metadata); | |
977 | ||
978 | ret = kernctl_buffer_flush(metadata->wait_fd); | |
979 | if (ret < 0) { | |
980 | ERR("Failed to flush kernel stream"); | |
981 | goto end; | |
982 | } | |
983 | ||
984 | ret = kernctl_snapshot(metadata->wait_fd); | |
985 | if (ret < 0) { | |
986 | if (errno != EAGAIN) { | |
987 | ERR("Sync metadata, taking kernel snapshot failed."); | |
988 | goto end; | |
989 | } | |
990 | DBG("Sync metadata, no new kernel metadata"); | |
991 | /* No new metadata, exit. */ | |
992 | ret = ENODATA; | |
993 | goto end; | |
994 | } | |
995 | ||
996 | end: | |
997 | return ret; | |
998 | } | |
309167d2 | 999 | |
d41f73b7 MD |
1000 | /* |
1001 | * Consume data on a file descriptor and write it on a trace file. | |
1002 | */ | |
4078b776 | 1003 | ssize_t lttng_kconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
1004 | struct lttng_consumer_local_data *ctx) |
1005 | { | |
1d4dfdef | 1006 | unsigned long len, subbuf_size, padding; |
1c20f0e2 | 1007 | int err, write_index = 1; |
4078b776 | 1008 | ssize_t ret = 0; |
d41f73b7 | 1009 | int infd = stream->wait_fd; |
309167d2 | 1010 | struct lttng_packet_index index; |
d41f73b7 MD |
1011 | |
1012 | DBG("In read_subbuffer (infd : %d)", infd); | |
309167d2 | 1013 | |
d41f73b7 MD |
1014 | /* Get the next subbuffer */ |
1015 | err = kernctl_get_next_subbuf(infd); | |
1016 | if (err != 0) { | |
d41f73b7 MD |
1017 | /* |
1018 | * This is a debug message even for single-threaded consumer, | |
1019 | * because poll() have more relaxed criterions than get subbuf, | |
1020 | * so get_subbuf may fail for short race windows where poll() | |
1021 | * would issue wakeups. | |
1022 | */ | |
1023 | DBG("Reserving sub buffer failed (everything is normal, " | |
1024 | "it is due to concurrency)"); | |
56591bac | 1025 | ret = -errno; |
d41f73b7 MD |
1026 | goto end; |
1027 | } | |
1028 | ||
1d4dfdef DG |
1029 | /* Get the full subbuffer size including padding */ |
1030 | err = kernctl_get_padded_subbuf_size(infd, &len); | |
1031 | if (err != 0) { | |
1d4dfdef | 1032 | perror("Getting sub-buffer len failed."); |
56591bac | 1033 | ret = -errno; |
1d4dfdef DG |
1034 | goto end; |
1035 | } | |
1036 | ||
1c20f0e2 | 1037 | if (!stream->metadata_flag) { |
309167d2 JD |
1038 | ret = get_index_values(&index, infd); |
1039 | if (ret < 0) { | |
1040 | goto end; | |
1041 | } | |
1c20f0e2 JD |
1042 | } else { |
1043 | write_index = 0; | |
309167d2 JD |
1044 | } |
1045 | ||
ffe60014 | 1046 | switch (stream->chan->output) { |
07b86b52 | 1047 | case CONSUMER_CHANNEL_SPLICE: |
1d4dfdef DG |
1048 | /* |
1049 | * XXX: The lttng-modules splice "actor" does not handle copying | |
1050 | * partial pages hence only using the subbuffer size without the | |
1051 | * padding makes the splice fail. | |
1052 | */ | |
1053 | subbuf_size = len; | |
1054 | padding = 0; | |
1055 | ||
1056 | /* splice the subbuffer to the tracefile */ | |
91dfef6e | 1057 | ret = lttng_consumer_on_read_subbuffer_splice(ctx, stream, subbuf_size, |
309167d2 | 1058 | padding, &index); |
91dfef6e DG |
1059 | /* |
1060 | * XXX: Splice does not support network streaming so the return value | |
1061 | * is simply checked against subbuf_size and not like the mmap() op. | |
1062 | */ | |
1d4dfdef DG |
1063 | if (ret != subbuf_size) { |
1064 | /* | |
1065 | * display the error but continue processing to try | |
1066 | * to release the subbuffer | |
1067 | */ | |
1068 | ERR("Error splicing to tracefile (ret: %zd != len: %lu)", | |
1069 | ret, subbuf_size); | |
309167d2 | 1070 | write_index = 0; |
1d4dfdef DG |
1071 | } |
1072 | break; | |
07b86b52 | 1073 | case CONSUMER_CHANNEL_MMAP: |
1d4dfdef DG |
1074 | /* Get subbuffer size without padding */ |
1075 | err = kernctl_get_subbuf_size(infd, &subbuf_size); | |
1076 | if (err != 0) { | |
1d4dfdef | 1077 | perror("Getting sub-buffer len failed."); |
56591bac | 1078 | ret = -errno; |
1d4dfdef DG |
1079 | goto end; |
1080 | } | |
47e81c02 | 1081 | |
1d4dfdef DG |
1082 | /* Make sure the tracer is not gone mad on us! */ |
1083 | assert(len >= subbuf_size); | |
1084 | ||
1085 | padding = len - subbuf_size; | |
1086 | ||
1087 | /* write the subbuffer to the tracefile */ | |
91dfef6e | 1088 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, |
309167d2 | 1089 | padding, &index); |
91dfef6e DG |
1090 | /* |
1091 | * The mmap operation should write subbuf_size amount of data when | |
1092 | * network streaming or the full padding (len) size when we are _not_ | |
1093 | * streaming. | |
1094 | */ | |
d88aee68 DG |
1095 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
1096 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
1d4dfdef | 1097 | /* |
91dfef6e DG |
1098 | * Display the error but continue processing to try to release the |
1099 | * subbuffer | |
1d4dfdef | 1100 | */ |
91dfef6e DG |
1101 | ERR("Error writing to tracefile " |
1102 | "(ret: %zd != len: %lu != subbuf_size: %lu)", | |
1103 | ret, len, subbuf_size); | |
309167d2 | 1104 | write_index = 0; |
1d4dfdef DG |
1105 | } |
1106 | break; | |
1107 | default: | |
1108 | ERR("Unknown output method"); | |
56591bac | 1109 | ret = -EPERM; |
d41f73b7 MD |
1110 | } |
1111 | ||
1112 | err = kernctl_put_next_subbuf(infd); | |
1113 | if (err != 0) { | |
d41f73b7 MD |
1114 | if (errno == EFAULT) { |
1115 | perror("Error in unreserving sub buffer\n"); | |
1116 | } else if (errno == EIO) { | |
1117 | /* Should never happen with newer LTTng versions */ | |
1118 | perror("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
1119 | } | |
56591bac | 1120 | ret = -errno; |
d41f73b7 MD |
1121 | goto end; |
1122 | } | |
1123 | ||
309167d2 | 1124 | /* Write index if needed. */ |
1c20f0e2 JD |
1125 | if (!write_index) { |
1126 | goto end; | |
1127 | } | |
1128 | ||
94d49140 JD |
1129 | if (stream->chan->live_timer_interval && !stream->metadata_flag) { |
1130 | /* | |
1131 | * In live, block until all the metadata is sent. | |
1132 | */ | |
1133 | err = consumer_stream_sync_metadata(ctx, stream->session_id); | |
1134 | if (err < 0) { | |
1135 | goto end; | |
1136 | } | |
1137 | } | |
1138 | ||
1c20f0e2 JD |
1139 | err = consumer_stream_write_index(stream, &index); |
1140 | if (err < 0) { | |
1141 | goto end; | |
309167d2 JD |
1142 | } |
1143 | ||
d41f73b7 MD |
1144 | end: |
1145 | return ret; | |
1146 | } | |
1147 | ||
1148 | int lttng_kconsumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
1149 | { | |
1150 | int ret; | |
ffe60014 DG |
1151 | |
1152 | assert(stream); | |
1153 | ||
2bba9e53 DG |
1154 | /* |
1155 | * Don't create anything if this is set for streaming or should not be | |
1156 | * monitored. | |
1157 | */ | |
1158 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { | |
fe4477ee JD |
1159 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
1160 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
309167d2 | 1161 | stream->uid, stream->gid, NULL); |
fe4477ee JD |
1162 | if (ret < 0) { |
1163 | goto error; | |
1164 | } | |
1165 | stream->out_fd = ret; | |
1166 | stream->tracefile_size_current = 0; | |
309167d2 JD |
1167 | |
1168 | if (!stream->metadata_flag) { | |
1169 | ret = index_create_file(stream->chan->pathname, | |
1170 | stream->name, stream->uid, stream->gid, | |
1171 | stream->chan->tracefile_size, | |
1172 | stream->tracefile_count_current); | |
1173 | if (ret < 0) { | |
1174 | goto error; | |
1175 | } | |
1176 | stream->index_fd = ret; | |
1177 | } | |
ffe60014 | 1178 | } |
d41f73b7 | 1179 | |
d41f73b7 MD |
1180 | if (stream->output == LTTNG_EVENT_MMAP) { |
1181 | /* get the len of the mmap region */ | |
1182 | unsigned long mmap_len; | |
1183 | ||
1184 | ret = kernctl_get_mmap_len(stream->wait_fd, &mmap_len); | |
1185 | if (ret != 0) { | |
ffe60014 | 1186 | PERROR("kernctl_get_mmap_len"); |
56591bac | 1187 | ret = -errno; |
d41f73b7 MD |
1188 | goto error_close_fd; |
1189 | } | |
1190 | stream->mmap_len = (size_t) mmap_len; | |
1191 | ||
ffe60014 DG |
1192 | stream->mmap_base = mmap(NULL, stream->mmap_len, PROT_READ, |
1193 | MAP_PRIVATE, stream->wait_fd, 0); | |
d41f73b7 | 1194 | if (stream->mmap_base == MAP_FAILED) { |
ffe60014 | 1195 | PERROR("Error mmaping"); |
d41f73b7 MD |
1196 | ret = -1; |
1197 | goto error_close_fd; | |
1198 | } | |
1199 | } | |
1200 | ||
1201 | /* we return 0 to let the library handle the FD internally */ | |
1202 | return 0; | |
1203 | ||
1204 | error_close_fd: | |
2f225ce2 | 1205 | if (stream->out_fd >= 0) { |
d41f73b7 MD |
1206 | int err; |
1207 | ||
1208 | err = close(stream->out_fd); | |
1209 | assert(!err); | |
2f225ce2 | 1210 | stream->out_fd = -1; |
d41f73b7 MD |
1211 | } |
1212 | error: | |
1213 | return ret; | |
1214 | } | |
1215 | ||
ca22feea DG |
1216 | /* |
1217 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
1218 | * stream. Consumer data lock MUST be acquired before calling this function |
1219 | * and the stream lock. | |
ca22feea | 1220 | * |
6d805429 | 1221 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
1222 | * data is available for trace viewer reading. |
1223 | */ | |
6d805429 | 1224 | int lttng_kconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
1225 | { |
1226 | int ret; | |
1227 | ||
1228 | assert(stream); | |
1229 | ||
873b9e9a MD |
1230 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
1231 | ret = 0; | |
1232 | goto end; | |
1233 | } | |
1234 | ||
ca22feea DG |
1235 | ret = kernctl_get_next_subbuf(stream->wait_fd); |
1236 | if (ret == 0) { | |
1237 | /* There is still data so let's put back this subbuffer. */ | |
1238 | ret = kernctl_put_subbuf(stream->wait_fd); | |
1239 | assert(ret == 0); | |
6d805429 | 1240 | ret = 1; /* Data is pending */ |
4e9a4686 | 1241 | goto end; |
ca22feea DG |
1242 | } |
1243 | ||
6d805429 DG |
1244 | /* Data is NOT pending and ready to be read. */ |
1245 | ret = 0; | |
ca22feea | 1246 | |
6efae65e DG |
1247 | end: |
1248 | return ret; | |
ca22feea | 1249 | } |