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