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 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
3bd1e081 | 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> |
f263b7fd | 38 | #include <common/compat/endian.h> |
acdb9057 | 39 | #include <common/pipe.h> |
00e2e675 | 40 | #include <common/relayd/relayd.h> |
fe4477ee | 41 | #include <common/utils.h> |
c8fea79c | 42 | #include <common/consumer/consumer-stream.h> |
309167d2 | 43 | #include <common/index/index.h> |
c8fea79c | 44 | #include <common/consumer/consumer-timer.h> |
0857097f | 45 | |
10a8a223 | 46 | #include "kernel-consumer.h" |
3bd1e081 MD |
47 | |
48 | extern struct lttng_consumer_global_data consumer_data; | |
49 | extern int consumer_poll_timeout; | |
50 | extern volatile int consumer_quit; | |
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); | |
ee6bb36a 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 | ||
74 | /* | |
75 | * Get the produced position | |
76 | * | |
77 | * Returns 0 on success, < 0 on error | |
78 | */ | |
ffe60014 | 79 | int lttng_kconsumer_get_produced_snapshot(struct lttng_consumer_stream *stream, |
3bd1e081 MD |
80 | unsigned long *pos) |
81 | { | |
82 | int ret; | |
83 | int infd = stream->wait_fd; | |
84 | ||
85 | ret = kernctl_snapshot_get_produced(infd, pos); | |
86 | if (ret != 0) { | |
5a510c9f | 87 | PERROR("kernctl_snapshot_get_produced"); |
3bd1e081 MD |
88 | } |
89 | ||
90 | return ret; | |
91 | } | |
92 | ||
07b86b52 JD |
93 | /* |
94 | * Get the consumerd position | |
95 | * | |
96 | * Returns 0 on success, < 0 on error | |
97 | */ | |
98 | int lttng_kconsumer_get_consumed_snapshot(struct lttng_consumer_stream *stream, | |
99 | unsigned long *pos) | |
100 | { | |
101 | int ret; | |
102 | int infd = stream->wait_fd; | |
103 | ||
104 | ret = kernctl_snapshot_get_consumed(infd, pos); | |
105 | if (ret != 0) { | |
5a510c9f | 106 | PERROR("kernctl_snapshot_get_consumed"); |
07b86b52 JD |
107 | } |
108 | ||
109 | return ret; | |
110 | } | |
111 | ||
07b86b52 JD |
112 | /* |
113 | * Take a snapshot of all the stream of a channel | |
114 | * | |
115 | * Returns 0 on success, < 0 on error | |
116 | */ | |
117 | int lttng_kconsumer_snapshot_channel(uint64_t key, char *path, | |
d07ceecd | 118 | uint64_t relayd_id, uint64_t nb_packets_per_stream, |
5c786ded | 119 | struct lttng_consumer_local_data *ctx) |
07b86b52 JD |
120 | { |
121 | int ret; | |
07b86b52 JD |
122 | struct lttng_consumer_channel *channel; |
123 | struct lttng_consumer_stream *stream; | |
124 | ||
6a00837f | 125 | DBG("Kernel consumer snapshot channel %" PRIu64, key); |
07b86b52 JD |
126 | |
127 | rcu_read_lock(); | |
128 | ||
129 | channel = consumer_find_channel(key); | |
130 | if (!channel) { | |
6a00837f | 131 | ERR("No channel found for key %" PRIu64, key); |
07b86b52 JD |
132 | ret = -1; |
133 | goto end; | |
134 | } | |
135 | ||
136 | /* Splice is not supported yet for channel snapshot. */ | |
137 | if (channel->output != CONSUMER_CHANNEL_MMAP) { | |
138 | ERR("Unsupported output %d", channel->output); | |
139 | ret = -1; | |
140 | goto end; | |
141 | } | |
142 | ||
10a50311 | 143 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { |
923333cd | 144 | unsigned long consumed_pos, produced_pos; |
9ce5646a MD |
145 | |
146 | health_code_update(); | |
147 | ||
07b86b52 JD |
148 | /* |
149 | * Lock stream because we are about to change its state. | |
150 | */ | |
151 | pthread_mutex_lock(&stream->lock); | |
152 | ||
29decac3 DG |
153 | /* |
154 | * Assign the received relayd ID so we can use it for streaming. The streams | |
155 | * are not visible to anyone so this is OK to change it. | |
156 | */ | |
07b86b52 JD |
157 | stream->net_seq_idx = relayd_id; |
158 | channel->relayd_id = relayd_id; | |
159 | if (relayd_id != (uint64_t) -1ULL) { | |
10a50311 | 160 | ret = consumer_send_relayd_stream(stream, path); |
07b86b52 JD |
161 | if (ret < 0) { |
162 | ERR("sending stream to relayd"); | |
163 | goto end_unlock; | |
164 | } | |
07b86b52 JD |
165 | } else { |
166 | ret = utils_create_stream_file(path, stream->name, | |
10a50311 JD |
167 | stream->chan->tracefile_size, |
168 | stream->tracefile_count_current, | |
309167d2 | 169 | stream->uid, stream->gid, NULL); |
07b86b52 JD |
170 | if (ret < 0) { |
171 | ERR("utils_create_stream_file"); | |
172 | goto end_unlock; | |
173 | } | |
174 | ||
175 | stream->out_fd = ret; | |
176 | stream->tracefile_size_current = 0; | |
177 | ||
81ea21bf MD |
178 | DBG("Kernel consumer snapshot stream %s/%s (%" PRIu64 ")", |
179 | path, stream->name, stream->key); | |
07b86b52 | 180 | } |
601262d6 JD |
181 | if (relayd_id != -1ULL) { |
182 | ret = consumer_send_relayd_streams_sent(relayd_id); | |
183 | if (ret < 0) { | |
184 | ERR("sending streams sent to relayd"); | |
185 | goto end_unlock; | |
186 | } | |
b7fa98e6 | 187 | channel->streams_sent_to_relayd = true; |
a4baae1b | 188 | } |
07b86b52 | 189 | |
612b8ed8 | 190 | ret = kernctl_buffer_flush_empty(stream->wait_fd); |
07b86b52 | 191 | if (ret < 0) { |
612b8ed8 MD |
192 | /* |
193 | * Doing a buffer flush which does not take into | |
194 | * account empty packets. This is not perfect | |
195 | * for stream intersection, but required as a | |
196 | * fall-back when "flush_empty" is not | |
197 | * implemented by lttng-modules. | |
198 | */ | |
199 | ret = kernctl_buffer_flush(stream->wait_fd); | |
200 | if (ret < 0) { | |
201 | ERR("Failed to flush kernel stream"); | |
202 | goto end_unlock; | |
203 | } | |
07b86b52 JD |
204 | goto end_unlock; |
205 | } | |
206 | ||
207 | ret = lttng_kconsumer_take_snapshot(stream); | |
208 | if (ret < 0) { | |
209 | ERR("Taking kernel snapshot"); | |
210 | goto end_unlock; | |
211 | } | |
212 | ||
213 | ret = lttng_kconsumer_get_produced_snapshot(stream, &produced_pos); | |
214 | if (ret < 0) { | |
215 | ERR("Produced kernel snapshot position"); | |
216 | goto end_unlock; | |
217 | } | |
218 | ||
219 | ret = lttng_kconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
220 | if (ret < 0) { | |
221 | ERR("Consumerd kernel snapshot position"); | |
222 | goto end_unlock; | |
223 | } | |
224 | ||
225 | if (stream->max_sb_size == 0) { | |
226 | ret = kernctl_get_max_subbuf_size(stream->wait_fd, | |
227 | &stream->max_sb_size); | |
228 | if (ret < 0) { | |
229 | ERR("Getting kernel max_sb_size"); | |
230 | goto end_unlock; | |
231 | } | |
232 | } | |
233 | ||
d07ceecd MD |
234 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
235 | produced_pos, nb_packets_per_stream, | |
236 | stream->max_sb_size); | |
5c786ded | 237 | |
07b86b52 JD |
238 | while (consumed_pos < produced_pos) { |
239 | ssize_t read_len; | |
240 | unsigned long len, padded_len; | |
241 | ||
9ce5646a MD |
242 | health_code_update(); |
243 | ||
07b86b52 JD |
244 | DBG("Kernel consumer taking snapshot at pos %lu", consumed_pos); |
245 | ||
246 | ret = kernctl_get_subbuf(stream->wait_fd, &consumed_pos); | |
247 | if (ret < 0) { | |
32af2c95 | 248 | if (ret != -EAGAIN) { |
07b86b52 JD |
249 | PERROR("kernctl_get_subbuf snapshot"); |
250 | goto end_unlock; | |
251 | } | |
252 | DBG("Kernel consumer get subbuf failed. Skipping it."); | |
253 | consumed_pos += stream->max_sb_size; | |
6e1f2e92 | 254 | stream->chan->lost_packets++; |
07b86b52 JD |
255 | continue; |
256 | } | |
257 | ||
258 | ret = kernctl_get_subbuf_size(stream->wait_fd, &len); | |
259 | if (ret < 0) { | |
260 | ERR("Snapshot kernctl_get_subbuf_size"); | |
29decac3 | 261 | goto error_put_subbuf; |
07b86b52 JD |
262 | } |
263 | ||
264 | ret = kernctl_get_padded_subbuf_size(stream->wait_fd, &padded_len); | |
265 | if (ret < 0) { | |
266 | ERR("Snapshot kernctl_get_padded_subbuf_size"); | |
29decac3 | 267 | goto error_put_subbuf; |
07b86b52 JD |
268 | } |
269 | ||
270 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
309167d2 | 271 | padded_len - len, NULL); |
07b86b52 | 272 | /* |
29decac3 DG |
273 | * We write the padded len in local tracefiles but the data len |
274 | * when using a relay. Display the error but continue processing | |
275 | * to try to release the subbuffer. | |
07b86b52 JD |
276 | */ |
277 | if (relayd_id != (uint64_t) -1ULL) { | |
278 | if (read_len != len) { | |
279 | ERR("Error sending to the relay (ret: %zd != len: %lu)", | |
280 | read_len, len); | |
281 | } | |
282 | } else { | |
283 | if (read_len != padded_len) { | |
284 | ERR("Error writing to tracefile (ret: %zd != len: %lu)", | |
285 | read_len, padded_len); | |
286 | } | |
287 | } | |
288 | ||
289 | ret = kernctl_put_subbuf(stream->wait_fd); | |
290 | if (ret < 0) { | |
291 | ERR("Snapshot kernctl_put_subbuf"); | |
292 | goto end_unlock; | |
293 | } | |
294 | consumed_pos += stream->max_sb_size; | |
295 | } | |
296 | ||
297 | if (relayd_id == (uint64_t) -1ULL) { | |
fdf9986c MD |
298 | if (stream->out_fd >= 0) { |
299 | ret = close(stream->out_fd); | |
300 | if (ret < 0) { | |
301 | PERROR("Kernel consumer snapshot close out_fd"); | |
302 | goto end_unlock; | |
303 | } | |
304 | stream->out_fd = -1; | |
07b86b52 | 305 | } |
07b86b52 JD |
306 | } else { |
307 | close_relayd_stream(stream); | |
308 | stream->net_seq_idx = (uint64_t) -1ULL; | |
309 | } | |
310 | pthread_mutex_unlock(&stream->lock); | |
311 | } | |
312 | ||
313 | /* All good! */ | |
314 | ret = 0; | |
315 | goto end; | |
316 | ||
29decac3 DG |
317 | error_put_subbuf: |
318 | ret = kernctl_put_subbuf(stream->wait_fd); | |
319 | if (ret < 0) { | |
320 | ERR("Snapshot kernctl_put_subbuf error path"); | |
321 | } | |
07b86b52 JD |
322 | end_unlock: |
323 | pthread_mutex_unlock(&stream->lock); | |
324 | end: | |
325 | rcu_read_unlock(); | |
326 | return ret; | |
327 | } | |
328 | ||
329 | /* | |
330 | * Read the whole metadata available for a snapshot. | |
331 | * | |
332 | * Returns 0 on success, < 0 on error | |
333 | */ | |
f36acc1a | 334 | static int lttng_kconsumer_snapshot_metadata(uint64_t key, char *path, |
e2039c7a | 335 | uint64_t relayd_id, struct lttng_consumer_local_data *ctx) |
07b86b52 | 336 | { |
d771f832 DG |
337 | int ret, use_relayd = 0; |
338 | ssize_t ret_read; | |
07b86b52 JD |
339 | struct lttng_consumer_channel *metadata_channel; |
340 | struct lttng_consumer_stream *metadata_stream; | |
d771f832 DG |
341 | |
342 | assert(ctx); | |
07b86b52 JD |
343 | |
344 | DBG("Kernel consumer snapshot metadata with key %" PRIu64 " at path %s", | |
345 | key, path); | |
346 | ||
347 | rcu_read_lock(); | |
348 | ||
349 | metadata_channel = consumer_find_channel(key); | |
350 | if (!metadata_channel) { | |
d771f832 | 351 | ERR("Kernel snapshot metadata not found for key %" PRIu64, key); |
07b86b52 | 352 | ret = -1; |
f36acc1a | 353 | goto error_no_channel; |
07b86b52 JD |
354 | } |
355 | ||
356 | metadata_stream = metadata_channel->metadata_stream; | |
357 | assert(metadata_stream); | |
f36acc1a | 358 | pthread_mutex_lock(&metadata_stream->lock); |
07b86b52 | 359 | |
d771f832 | 360 | /* Flag once that we have a valid relayd for the stream. */ |
e2039c7a | 361 | if (relayd_id != (uint64_t) -1ULL) { |
d771f832 DG |
362 | use_relayd = 1; |
363 | } | |
364 | ||
365 | if (use_relayd) { | |
10a50311 | 366 | ret = consumer_send_relayd_stream(metadata_stream, path); |
e2039c7a | 367 | if (ret < 0) { |
f36acc1a | 368 | goto error_snapshot; |
e2039c7a | 369 | } |
e2039c7a JD |
370 | } else { |
371 | ret = utils_create_stream_file(path, metadata_stream->name, | |
372 | metadata_stream->chan->tracefile_size, | |
373 | metadata_stream->tracefile_count_current, | |
309167d2 | 374 | metadata_stream->uid, metadata_stream->gid, NULL); |
e2039c7a | 375 | if (ret < 0) { |
f36acc1a | 376 | goto error_snapshot; |
e2039c7a JD |
377 | } |
378 | metadata_stream->out_fd = ret; | |
07b86b52 | 379 | } |
07b86b52 | 380 | |
d771f832 | 381 | do { |
9ce5646a MD |
382 | health_code_update(); |
383 | ||
d771f832 DG |
384 | ret_read = lttng_kconsumer_read_subbuffer(metadata_stream, ctx); |
385 | if (ret_read < 0) { | |
56591bac | 386 | if (ret_read != -EAGAIN) { |
6a00837f | 387 | ERR("Kernel snapshot reading metadata subbuffer (ret: %zd)", |
d771f832 | 388 | ret_read); |
f36acc1a JG |
389 | ret = ret_read; |
390 | goto error_snapshot; | |
07b86b52 | 391 | } |
d771f832 | 392 | /* ret_read is negative at this point so we will exit the loop. */ |
07b86b52 JD |
393 | continue; |
394 | } | |
d771f832 | 395 | } while (ret_read >= 0); |
07b86b52 | 396 | |
d771f832 DG |
397 | if (use_relayd) { |
398 | close_relayd_stream(metadata_stream); | |
399 | metadata_stream->net_seq_idx = (uint64_t) -1ULL; | |
400 | } else { | |
fdf9986c MD |
401 | if (metadata_stream->out_fd >= 0) { |
402 | ret = close(metadata_stream->out_fd); | |
403 | if (ret < 0) { | |
404 | PERROR("Kernel consumer snapshot metadata close out_fd"); | |
405 | /* | |
406 | * Don't go on error here since the snapshot was successful at this | |
407 | * point but somehow the close failed. | |
408 | */ | |
409 | } | |
410 | metadata_stream->out_fd = -1; | |
e2039c7a | 411 | } |
e2039c7a JD |
412 | } |
413 | ||
07b86b52 | 414 | ret = 0; |
f36acc1a JG |
415 | error_snapshot: |
416 | pthread_mutex_unlock(&metadata_stream->lock); | |
cf53a8a6 JD |
417 | cds_list_del(&metadata_stream->send_node); |
418 | consumer_stream_destroy(metadata_stream, NULL); | |
419 | metadata_channel->metadata_stream = NULL; | |
f36acc1a | 420 | error_no_channel: |
07b86b52 JD |
421 | rcu_read_unlock(); |
422 | return ret; | |
423 | } | |
424 | ||
1803a064 MD |
425 | /* |
426 | * Receive command from session daemon and process it. | |
427 | * | |
428 | * Return 1 on success else a negative value or 0. | |
429 | */ | |
3bd1e081 MD |
430 | int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
431 | int sock, struct pollfd *consumer_sockpoll) | |
432 | { | |
433 | ssize_t ret; | |
0c759fc9 | 434 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 MD |
435 | struct lttcomm_consumer_msg msg; |
436 | ||
9ce5646a MD |
437 | health_code_update(); |
438 | ||
3bd1e081 MD |
439 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
440 | if (ret != sizeof(msg)) { | |
1803a064 | 441 | if (ret > 0) { |
c6857fcf | 442 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
1803a064 MD |
443 | ret = -1; |
444 | } | |
3bd1e081 MD |
445 | return ret; |
446 | } | |
9ce5646a MD |
447 | |
448 | health_code_update(); | |
449 | ||
84382d49 MD |
450 | /* Deprecated command */ |
451 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 452 | |
9ce5646a MD |
453 | health_code_update(); |
454 | ||
b0b335c8 MD |
455 | /* relayd needs RCU read-side protection */ |
456 | rcu_read_lock(); | |
457 | ||
3bd1e081 | 458 | switch (msg.cmd_type) { |
00e2e675 DG |
459 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
460 | { | |
f50f23d9 | 461 | /* Session daemon status message are handled in the following call. */ |
7735ef9e DG |
462 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
463 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, | |
d3e2ba59 JD |
464 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
465 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
466 | goto end_nosignal; |
467 | } | |
3bd1e081 MD |
468 | case LTTNG_CONSUMER_ADD_CHANNEL: |
469 | { | |
470 | struct lttng_consumer_channel *new_channel; | |
e43c41c5 | 471 | int ret_recv; |
3bd1e081 | 472 | |
9ce5646a MD |
473 | health_code_update(); |
474 | ||
f50f23d9 DG |
475 | /* First send a status message before receiving the fds. */ |
476 | ret = consumer_send_status_msg(sock, ret_code); | |
477 | if (ret < 0) { | |
478 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 479 | goto error_fatal; |
f50f23d9 | 480 | } |
9ce5646a MD |
481 | |
482 | health_code_update(); | |
483 | ||
d88aee68 | 484 | DBG("consumer_add_channel %" PRIu64, msg.u.channel.channel_key); |
3bd1e081 | 485 | new_channel = consumer_allocate_channel(msg.u.channel.channel_key, |
ffe60014 DG |
486 | msg.u.channel.session_id, msg.u.channel.pathname, |
487 | msg.u.channel.name, msg.u.channel.uid, msg.u.channel.gid, | |
1624d5b7 JD |
488 | msg.u.channel.relayd_id, msg.u.channel.output, |
489 | msg.u.channel.tracefile_size, | |
1950109e | 490 | msg.u.channel.tracefile_count, 0, |
ecc48a90 | 491 | msg.u.channel.monitor, |
d7ba1388 | 492 | msg.u.channel.live_timer_interval, |
3d071855 | 493 | NULL, NULL); |
3bd1e081 | 494 | if (new_channel == NULL) { |
f73fabfd | 495 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
3bd1e081 MD |
496 | goto end_nosignal; |
497 | } | |
ffe60014 | 498 | new_channel->nb_init_stream_left = msg.u.channel.nb_init_streams; |
95a1109b JD |
499 | switch (msg.u.channel.output) { |
500 | case LTTNG_EVENT_SPLICE: | |
501 | new_channel->output = CONSUMER_CHANNEL_SPLICE; | |
502 | break; | |
503 | case LTTNG_EVENT_MMAP: | |
504 | new_channel->output = CONSUMER_CHANNEL_MMAP; | |
505 | break; | |
506 | default: | |
507 | ERR("Channel output unknown %d", msg.u.channel.output); | |
508 | goto end_nosignal; | |
509 | } | |
ffe60014 DG |
510 | |
511 | /* Translate and save channel type. */ | |
512 | switch (msg.u.channel.type) { | |
513 | case CONSUMER_CHANNEL_TYPE_DATA: | |
514 | case CONSUMER_CHANNEL_TYPE_METADATA: | |
515 | new_channel->type = msg.u.channel.type; | |
516 | break; | |
517 | default: | |
518 | assert(0); | |
519 | goto end_nosignal; | |
520 | }; | |
521 | ||
9ce5646a MD |
522 | health_code_update(); |
523 | ||
3bd1e081 | 524 | if (ctx->on_recv_channel != NULL) { |
e43c41c5 JD |
525 | ret_recv = ctx->on_recv_channel(new_channel); |
526 | if (ret_recv == 0) { | |
527 | ret = consumer_add_channel(new_channel, ctx); | |
528 | } else if (ret_recv < 0) { | |
3bd1e081 MD |
529 | goto end_nosignal; |
530 | } | |
531 | } else { | |
e43c41c5 | 532 | ret = consumer_add_channel(new_channel, ctx); |
3bd1e081 | 533 | } |
94d49140 JD |
534 | if (CONSUMER_CHANNEL_TYPE_DATA) { |
535 | consumer_timer_live_start(new_channel, | |
536 | msg.u.channel.live_timer_interval); | |
537 | } | |
e43c41c5 | 538 | |
9ce5646a MD |
539 | health_code_update(); |
540 | ||
e43c41c5 | 541 | /* If we received an error in add_channel, we need to report it. */ |
821fffb2 | 542 | if (ret < 0) { |
1803a064 MD |
543 | ret = consumer_send_status_msg(sock, ret); |
544 | if (ret < 0) { | |
545 | goto error_fatal; | |
546 | } | |
e43c41c5 JD |
547 | goto end_nosignal; |
548 | } | |
549 | ||
3bd1e081 MD |
550 | goto end_nosignal; |
551 | } | |
552 | case LTTNG_CONSUMER_ADD_STREAM: | |
553 | { | |
dae10966 DG |
554 | int fd; |
555 | struct lttng_pipe *stream_pipe; | |
00e2e675 | 556 | struct lttng_consumer_stream *new_stream; |
ffe60014 | 557 | struct lttng_consumer_channel *channel; |
c80048c6 | 558 | int alloc_ret = 0; |
3bd1e081 | 559 | |
ffe60014 DG |
560 | /* |
561 | * Get stream's channel reference. Needed when adding the stream to the | |
562 | * global hash table. | |
563 | */ | |
564 | channel = consumer_find_channel(msg.u.stream.channel_key); | |
565 | if (!channel) { | |
566 | /* | |
567 | * We could not find the channel. Can happen if cpu hotplug | |
568 | * happens while tearing down. | |
569 | */ | |
d88aee68 | 570 | ERR("Unable to find channel key %" PRIu64, msg.u.stream.channel_key); |
e462382a | 571 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
ffe60014 DG |
572 | } |
573 | ||
9ce5646a MD |
574 | health_code_update(); |
575 | ||
f50f23d9 DG |
576 | /* First send a status message before receiving the fds. */ |
577 | ret = consumer_send_status_msg(sock, ret_code); | |
1803a064 | 578 | if (ret < 0) { |
d771f832 | 579 | /* Somehow, the session daemon is not responding anymore. */ |
1803a064 MD |
580 | goto error_fatal; |
581 | } | |
9ce5646a MD |
582 | |
583 | health_code_update(); | |
584 | ||
0c759fc9 | 585 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
d771f832 | 586 | /* Channel was not found. */ |
f50f23d9 DG |
587 | goto end_nosignal; |
588 | } | |
589 | ||
d771f832 | 590 | /* Blocking call */ |
9ce5646a MD |
591 | health_poll_entry(); |
592 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
593 | health_poll_exit(); | |
84382d49 MD |
594 | if (ret) { |
595 | goto error_fatal; | |
3bd1e081 | 596 | } |
00e2e675 | 597 | |
9ce5646a MD |
598 | health_code_update(); |
599 | ||
00e2e675 | 600 | /* Get stream file descriptor from socket */ |
f2fc6720 MD |
601 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); |
602 | if (ret != sizeof(fd)) { | |
f73fabfd | 603 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
3f8e211f | 604 | rcu_read_unlock(); |
3bd1e081 MD |
605 | return ret; |
606 | } | |
3bd1e081 | 607 | |
9ce5646a MD |
608 | health_code_update(); |
609 | ||
f50f23d9 DG |
610 | /* |
611 | * Send status code to session daemon only if the recv works. If the | |
612 | * above recv() failed, the session daemon is notified through the | |
613 | * error socket and the teardown is eventually done. | |
614 | */ | |
615 | ret = consumer_send_status_msg(sock, ret_code); | |
616 | if (ret < 0) { | |
617 | /* Somehow, the session daemon is not responding anymore. */ | |
618 | goto end_nosignal; | |
619 | } | |
620 | ||
9ce5646a MD |
621 | health_code_update(); |
622 | ||
ffe60014 DG |
623 | new_stream = consumer_allocate_stream(channel->key, |
624 | fd, | |
625 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
626 | channel->name, | |
627 | channel->uid, | |
628 | channel->gid, | |
629 | channel->relayd_id, | |
630 | channel->session_id, | |
631 | msg.u.stream.cpu, | |
632 | &alloc_ret, | |
4891ece8 DG |
633 | channel->type, |
634 | channel->monitor); | |
3bd1e081 | 635 | if (new_stream == NULL) { |
c80048c6 MD |
636 | switch (alloc_ret) { |
637 | case -ENOMEM: | |
638 | case -EINVAL: | |
639 | default: | |
640 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
641 | break; | |
c80048c6 | 642 | } |
3f8e211f | 643 | goto end_nosignal; |
3bd1e081 | 644 | } |
d771f832 | 645 | |
ffe60014 DG |
646 | new_stream->chan = channel; |
647 | new_stream->wait_fd = fd; | |
07b86b52 JD |
648 | switch (channel->output) { |
649 | case CONSUMER_CHANNEL_SPLICE: | |
650 | new_stream->output = LTTNG_EVENT_SPLICE; | |
a2361a61 JD |
651 | ret = utils_create_pipe(new_stream->splice_pipe); |
652 | if (ret < 0) { | |
653 | goto end_nosignal; | |
654 | } | |
07b86b52 JD |
655 | break; |
656 | case CONSUMER_CHANNEL_MMAP: | |
657 | new_stream->output = LTTNG_EVENT_MMAP; | |
658 | break; | |
659 | default: | |
660 | ERR("Stream output unknown %d", channel->output); | |
661 | goto end_nosignal; | |
662 | } | |
00e2e675 | 663 | |
a0c83db9 DG |
664 | /* |
665 | * We've just assigned the channel to the stream so increment the | |
07b86b52 JD |
666 | * refcount right now. We don't need to increment the refcount for |
667 | * streams in no monitor because we handle manually the cleanup of | |
668 | * those. It is very important to make sure there is NO prior | |
669 | * consumer_del_stream() calls or else the refcount will be unbalanced. | |
a0c83db9 | 670 | */ |
07b86b52 JD |
671 | if (channel->monitor) { |
672 | uatomic_inc(&new_stream->chan->refcount); | |
673 | } | |
9d9353f9 | 674 | |
fb3a43a9 DG |
675 | /* |
676 | * The buffer flush is done on the session daemon side for the kernel | |
677 | * so no need for the stream "hangup_flush_done" variable to be | |
678 | * tracked. This is important for a kernel stream since we don't rely | |
679 | * on the flush state of the stream to read data. It's not the case for | |
680 | * user space tracing. | |
681 | */ | |
682 | new_stream->hangup_flush_done = 0; | |
683 | ||
9ce5646a MD |
684 | health_code_update(); |
685 | ||
633d0084 DG |
686 | if (ctx->on_recv_stream) { |
687 | ret = ctx->on_recv_stream(new_stream); | |
688 | if (ret < 0) { | |
d771f832 | 689 | consumer_stream_free(new_stream); |
633d0084 | 690 | goto end_nosignal; |
fb3a43a9 | 691 | } |
633d0084 | 692 | } |
fb3a43a9 | 693 | |
9ce5646a MD |
694 | health_code_update(); |
695 | ||
07b86b52 JD |
696 | if (new_stream->metadata_flag) { |
697 | channel->metadata_stream = new_stream; | |
698 | } | |
699 | ||
2bba9e53 DG |
700 | /* Do not monitor this stream. */ |
701 | if (!channel->monitor) { | |
5eecee74 | 702 | DBG("Kernel consumer add stream %s in no monitor mode with " |
6dc3064a | 703 | "relayd id %" PRIu64, new_stream->name, |
5eecee74 | 704 | new_stream->net_seq_idx); |
10a50311 | 705 | cds_list_add(&new_stream->send_node, &channel->streams.head); |
6dc3064a DG |
706 | break; |
707 | } | |
708 | ||
e1b71bdc DG |
709 | /* Send stream to relayd if the stream has an ID. */ |
710 | if (new_stream->net_seq_idx != (uint64_t) -1ULL) { | |
194ee077 DG |
711 | ret = consumer_send_relayd_stream(new_stream, |
712 | new_stream->chan->pathname); | |
e1b71bdc DG |
713 | if (ret < 0) { |
714 | consumer_stream_free(new_stream); | |
715 | goto end_nosignal; | |
716 | } | |
b7fa98e6 MD |
717 | |
718 | /* | |
719 | * If adding an extra stream to an already | |
720 | * existing channel (e.g. cpu hotplug), we need | |
721 | * to send the "streams_sent" command to relayd. | |
722 | */ | |
723 | if (channel->streams_sent_to_relayd) { | |
724 | ret = consumer_send_relayd_streams_sent( | |
725 | new_stream->net_seq_idx); | |
726 | if (ret < 0) { | |
727 | goto end_nosignal; | |
728 | } | |
729 | } | |
e2039c7a JD |
730 | } |
731 | ||
50f8ae69 | 732 | /* Get the right pipe where the stream will be sent. */ |
633d0084 | 733 | if (new_stream->metadata_flag) { |
5ab66908 MD |
734 | ret = consumer_add_metadata_stream(new_stream); |
735 | if (ret) { | |
736 | ERR("Consumer add metadata stream %" PRIu64 " failed. Continuing", | |
737 | new_stream->key); | |
738 | consumer_stream_free(new_stream); | |
739 | goto end_nosignal; | |
740 | } | |
dae10966 | 741 | stream_pipe = ctx->consumer_metadata_pipe; |
3bd1e081 | 742 | } else { |
5ab66908 MD |
743 | ret = consumer_add_data_stream(new_stream); |
744 | if (ret) { | |
745 | ERR("Consumer add stream %" PRIu64 " failed. Continuing", | |
746 | new_stream->key); | |
747 | consumer_stream_free(new_stream); | |
748 | goto end_nosignal; | |
749 | } | |
dae10966 | 750 | stream_pipe = ctx->consumer_data_pipe; |
50f8ae69 DG |
751 | } |
752 | ||
5ab66908 MD |
753 | /* Vitible to other threads */ |
754 | new_stream->globally_visible = 1; | |
755 | ||
9ce5646a MD |
756 | health_code_update(); |
757 | ||
dae10966 | 758 | ret = lttng_pipe_write(stream_pipe, &new_stream, sizeof(new_stream)); |
50f8ae69 | 759 | if (ret < 0) { |
dae10966 | 760 | ERR("Consumer write %s stream to pipe %d", |
50f8ae69 | 761 | new_stream->metadata_flag ? "metadata" : "data", |
dae10966 | 762 | lttng_pipe_get_writefd(stream_pipe)); |
5ab66908 MD |
763 | if (new_stream->metadata_flag) { |
764 | consumer_del_stream_for_metadata(new_stream); | |
765 | } else { | |
766 | consumer_del_stream_for_data(new_stream); | |
767 | } | |
50f8ae69 | 768 | goto end_nosignal; |
3bd1e081 | 769 | } |
00e2e675 | 770 | |
50f8ae69 | 771 | DBG("Kernel consumer ADD_STREAM %s (fd: %d) with relayd id %" PRIu64, |
ffe60014 | 772 | new_stream->name, fd, new_stream->relayd_stream_id); |
3bd1e081 MD |
773 | break; |
774 | } | |
a4baae1b JD |
775 | case LTTNG_CONSUMER_STREAMS_SENT: |
776 | { | |
777 | struct lttng_consumer_channel *channel; | |
778 | ||
779 | /* | |
780 | * Get stream's channel reference. Needed when adding the stream to the | |
781 | * global hash table. | |
782 | */ | |
783 | channel = consumer_find_channel(msg.u.sent_streams.channel_key); | |
784 | if (!channel) { | |
785 | /* | |
786 | * We could not find the channel. Can happen if cpu hotplug | |
787 | * happens while tearing down. | |
788 | */ | |
789 | ERR("Unable to find channel key %" PRIu64, | |
790 | msg.u.sent_streams.channel_key); | |
e462382a | 791 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
a4baae1b JD |
792 | } |
793 | ||
794 | health_code_update(); | |
795 | ||
796 | /* | |
797 | * Send status code to session daemon. | |
798 | */ | |
799 | ret = consumer_send_status_msg(sock, ret_code); | |
f261ad0a | 800 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
a4baae1b JD |
801 | /* Somehow, the session daemon is not responding anymore. */ |
802 | goto end_nosignal; | |
803 | } | |
804 | ||
805 | health_code_update(); | |
806 | ||
807 | /* | |
808 | * We should not send this message if we don't monitor the | |
809 | * streams in this channel. | |
810 | */ | |
811 | if (!channel->monitor) { | |
812 | break; | |
813 | } | |
814 | ||
815 | health_code_update(); | |
816 | /* Send stream to relayd if the stream has an ID. */ | |
817 | if (msg.u.sent_streams.net_seq_idx != (uint64_t) -1ULL) { | |
818 | ret = consumer_send_relayd_streams_sent( | |
819 | msg.u.sent_streams.net_seq_idx); | |
820 | if (ret < 0) { | |
821 | goto end_nosignal; | |
822 | } | |
b7fa98e6 | 823 | channel->streams_sent_to_relayd = true; |
a4baae1b JD |
824 | } |
825 | break; | |
826 | } | |
3bd1e081 MD |
827 | case LTTNG_CONSUMER_UPDATE_STREAM: |
828 | { | |
3f8e211f DG |
829 | rcu_read_unlock(); |
830 | return -ENOSYS; | |
831 | } | |
832 | case LTTNG_CONSUMER_DESTROY_RELAYD: | |
833 | { | |
a6ba4fe1 | 834 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
3f8e211f DG |
835 | struct consumer_relayd_sock_pair *relayd; |
836 | ||
a6ba4fe1 | 837 | DBG("Kernel consumer destroying relayd %" PRIu64, index); |
3f8e211f DG |
838 | |
839 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 840 | relayd = consumer_find_relayd(index); |
3f8e211f | 841 | if (relayd == NULL) { |
3448e266 | 842 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 843 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
3bd1e081 | 844 | } |
3f8e211f | 845 | |
a6ba4fe1 DG |
846 | /* |
847 | * Each relayd socket pair has a refcount of stream attached to it | |
848 | * which tells if the relayd is still active or not depending on the | |
849 | * refcount value. | |
850 | * | |
851 | * This will set the destroy flag of the relayd object and destroy it | |
852 | * if the refcount reaches zero when called. | |
853 | * | |
854 | * The destroy can happen either here or when a stream fd hangs up. | |
855 | */ | |
f50f23d9 DG |
856 | if (relayd) { |
857 | consumer_flag_relayd_for_destroy(relayd); | |
858 | } | |
859 | ||
9ce5646a MD |
860 | health_code_update(); |
861 | ||
f50f23d9 DG |
862 | ret = consumer_send_status_msg(sock, ret_code); |
863 | if (ret < 0) { | |
864 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 865 | goto error_fatal; |
f50f23d9 | 866 | } |
3f8e211f | 867 | |
3f8e211f | 868 | goto end_nosignal; |
3bd1e081 | 869 | } |
6d805429 | 870 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 871 | { |
c8f59ee5 | 872 | int32_t ret; |
6d805429 | 873 | uint64_t id = msg.u.data_pending.session_id; |
c8f59ee5 | 874 | |
6d805429 | 875 | DBG("Kernel consumer data pending command for id %" PRIu64, id); |
c8f59ee5 | 876 | |
6d805429 | 877 | ret = consumer_data_pending(id); |
c8f59ee5 | 878 | |
9ce5646a MD |
879 | health_code_update(); |
880 | ||
c8f59ee5 DG |
881 | /* Send back returned value to session daemon */ |
882 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
883 | if (ret < 0) { | |
6d805429 | 884 | PERROR("send data pending ret code"); |
1803a064 | 885 | goto error_fatal; |
c8f59ee5 | 886 | } |
f50f23d9 DG |
887 | |
888 | /* | |
889 | * No need to send back a status message since the data pending | |
890 | * returned value is the response. | |
891 | */ | |
c8f59ee5 | 892 | break; |
53632229 | 893 | } |
6dc3064a DG |
894 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
895 | { | |
07b86b52 JD |
896 | if (msg.u.snapshot_channel.metadata == 1) { |
897 | ret = lttng_kconsumer_snapshot_metadata(msg.u.snapshot_channel.key, | |
e2039c7a JD |
898 | msg.u.snapshot_channel.pathname, |
899 | msg.u.snapshot_channel.relayd_id, ctx); | |
07b86b52 JD |
900 | if (ret < 0) { |
901 | ERR("Snapshot metadata failed"); | |
e462382a | 902 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; |
07b86b52 JD |
903 | } |
904 | } else { | |
905 | ret = lttng_kconsumer_snapshot_channel(msg.u.snapshot_channel.key, | |
906 | msg.u.snapshot_channel.pathname, | |
5c786ded | 907 | msg.u.snapshot_channel.relayd_id, |
d07ceecd | 908 | msg.u.snapshot_channel.nb_packets_per_stream, |
5c786ded | 909 | ctx); |
07b86b52 JD |
910 | if (ret < 0) { |
911 | ERR("Snapshot channel failed"); | |
e462382a | 912 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
07b86b52 JD |
913 | } |
914 | } | |
915 | ||
9ce5646a MD |
916 | health_code_update(); |
917 | ||
6dc3064a DG |
918 | ret = consumer_send_status_msg(sock, ret_code); |
919 | if (ret < 0) { | |
920 | /* Somehow, the session daemon is not responding anymore. */ | |
921 | goto end_nosignal; | |
922 | } | |
923 | break; | |
924 | } | |
07b86b52 JD |
925 | case LTTNG_CONSUMER_DESTROY_CHANNEL: |
926 | { | |
927 | uint64_t key = msg.u.destroy_channel.key; | |
928 | struct lttng_consumer_channel *channel; | |
929 | ||
930 | channel = consumer_find_channel(key); | |
931 | if (!channel) { | |
932 | ERR("Kernel consumer destroy channel %" PRIu64 " not found", key); | |
e462382a | 933 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
07b86b52 JD |
934 | } |
935 | ||
9ce5646a MD |
936 | health_code_update(); |
937 | ||
07b86b52 JD |
938 | ret = consumer_send_status_msg(sock, ret_code); |
939 | if (ret < 0) { | |
940 | /* Somehow, the session daemon is not responding anymore. */ | |
941 | goto end_nosignal; | |
942 | } | |
943 | ||
9ce5646a MD |
944 | health_code_update(); |
945 | ||
15dc512a DG |
946 | /* Stop right now if no channel was found. */ |
947 | if (!channel) { | |
948 | goto end_nosignal; | |
949 | } | |
950 | ||
07b86b52 JD |
951 | /* |
952 | * This command should ONLY be issued for channel with streams set in | |
953 | * no monitor mode. | |
954 | */ | |
955 | assert(!channel->monitor); | |
956 | ||
957 | /* | |
958 | * The refcount should ALWAYS be 0 in the case of a channel in no | |
959 | * monitor mode. | |
960 | */ | |
961 | assert(!uatomic_sub_return(&channel->refcount, 1)); | |
962 | ||
963 | consumer_del_channel(channel); | |
964 | ||
965 | goto end_nosignal; | |
966 | } | |
fb83fe64 JD |
967 | case LTTNG_CONSUMER_DISCARDED_EVENTS: |
968 | { | |
969 | uint64_t ret; | |
970 | struct lttng_consumer_channel *channel; | |
971 | uint64_t id = msg.u.discarded_events.session_id; | |
972 | uint64_t key = msg.u.discarded_events.channel_key; | |
973 | ||
e5742757 MD |
974 | DBG("Kernel consumer discarded events command for session id %" |
975 | PRIu64 ", channel key %" PRIu64, id, key); | |
976 | ||
fb83fe64 JD |
977 | channel = consumer_find_channel(key); |
978 | if (!channel) { | |
979 | ERR("Kernel consumer discarded events channel %" | |
980 | PRIu64 " not found", key); | |
e5742757 MD |
981 | ret = 0; |
982 | } else { | |
983 | ret = channel->discarded_events; | |
fb83fe64 JD |
984 | } |
985 | ||
fb83fe64 JD |
986 | health_code_update(); |
987 | ||
988 | /* Send back returned value to session daemon */ | |
989 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
990 | if (ret < 0) { | |
991 | PERROR("send discarded events"); | |
992 | goto error_fatal; | |
993 | } | |
994 | ||
995 | break; | |
996 | } | |
997 | case LTTNG_CONSUMER_LOST_PACKETS: | |
998 | { | |
999 | uint64_t ret; | |
1000 | struct lttng_consumer_channel *channel; | |
1001 | uint64_t id = msg.u.lost_packets.session_id; | |
1002 | uint64_t key = msg.u.lost_packets.channel_key; | |
1003 | ||
e5742757 MD |
1004 | DBG("Kernel consumer lost packets command for session id %" |
1005 | PRIu64 ", channel key %" PRIu64, id, key); | |
1006 | ||
fb83fe64 JD |
1007 | channel = consumer_find_channel(key); |
1008 | if (!channel) { | |
1009 | ERR("Kernel consumer lost packets channel %" | |
1010 | PRIu64 " not found", key); | |
e5742757 MD |
1011 | ret = 0; |
1012 | } else { | |
1013 | ret = channel->lost_packets; | |
fb83fe64 JD |
1014 | } |
1015 | ||
fb83fe64 JD |
1016 | health_code_update(); |
1017 | ||
1018 | /* Send back returned value to session daemon */ | |
1019 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
1020 | if (ret < 0) { | |
1021 | PERROR("send lost packets"); | |
1022 | goto error_fatal; | |
1023 | } | |
1024 | ||
1025 | break; | |
1026 | } | |
3bd1e081 | 1027 | default: |
3f8e211f | 1028 | goto end_nosignal; |
3bd1e081 | 1029 | } |
3f8e211f | 1030 | |
3bd1e081 | 1031 | end_nosignal: |
b0b335c8 | 1032 | rcu_read_unlock(); |
4cbc1a04 DG |
1033 | |
1034 | /* | |
1035 | * Return 1 to indicate success since the 0 value can be a socket | |
1036 | * shutdown during the recv() or send() call. | |
1037 | */ | |
9ce5646a | 1038 | health_code_update(); |
4cbc1a04 | 1039 | return 1; |
1803a064 MD |
1040 | |
1041 | error_fatal: | |
1042 | rcu_read_unlock(); | |
1043 | /* This will issue a consumer stop. */ | |
1044 | return -1; | |
3bd1e081 | 1045 | } |
d41f73b7 | 1046 | |
309167d2 JD |
1047 | /* |
1048 | * Populate index values of a kernel stream. Values are set in big endian order. | |
1049 | * | |
1050 | * Return 0 on success or else a negative value. | |
1051 | */ | |
50adc264 | 1052 | static int get_index_values(struct ctf_packet_index *index, int infd) |
309167d2 JD |
1053 | { |
1054 | int ret; | |
1055 | ||
1056 | ret = kernctl_get_timestamp_begin(infd, &index->timestamp_begin); | |
1057 | if (ret < 0) { | |
1058 | PERROR("kernctl_get_timestamp_begin"); | |
1059 | goto error; | |
1060 | } | |
1061 | index->timestamp_begin = htobe64(index->timestamp_begin); | |
1062 | ||
1063 | ret = kernctl_get_timestamp_end(infd, &index->timestamp_end); | |
1064 | if (ret < 0) { | |
1065 | PERROR("kernctl_get_timestamp_end"); | |
1066 | goto error; | |
1067 | } | |
1068 | index->timestamp_end = htobe64(index->timestamp_end); | |
1069 | ||
1070 | ret = kernctl_get_events_discarded(infd, &index->events_discarded); | |
1071 | if (ret < 0) { | |
1072 | PERROR("kernctl_get_events_discarded"); | |
1073 | goto error; | |
1074 | } | |
1075 | index->events_discarded = htobe64(index->events_discarded); | |
1076 | ||
1077 | ret = kernctl_get_content_size(infd, &index->content_size); | |
1078 | if (ret < 0) { | |
1079 | PERROR("kernctl_get_content_size"); | |
1080 | goto error; | |
1081 | } | |
1082 | index->content_size = htobe64(index->content_size); | |
1083 | ||
1084 | ret = kernctl_get_packet_size(infd, &index->packet_size); | |
1085 | if (ret < 0) { | |
1086 | PERROR("kernctl_get_packet_size"); | |
1087 | goto error; | |
1088 | } | |
1089 | index->packet_size = htobe64(index->packet_size); | |
1090 | ||
1091 | ret = kernctl_get_stream_id(infd, &index->stream_id); | |
1092 | if (ret < 0) { | |
1093 | PERROR("kernctl_get_stream_id"); | |
1094 | goto error; | |
1095 | } | |
1096 | index->stream_id = htobe64(index->stream_id); | |
1097 | ||
234cd636 JD |
1098 | ret = kernctl_get_instance_id(infd, &index->stream_instance_id); |
1099 | if (ret < 0) { | |
f0b03c22 MD |
1100 | if (ret == -ENOTTY) { |
1101 | /* Command not implemented by lttng-modules. */ | |
1102 | index->stream_instance_id = -1ULL; | |
1103 | ret = 0; | |
1104 | } else { | |
1105 | PERROR("kernctl_get_instance_id"); | |
1106 | goto error; | |
1107 | } | |
234cd636 JD |
1108 | } |
1109 | index->stream_instance_id = htobe64(index->stream_instance_id); | |
1110 | ||
1111 | ret = kernctl_get_sequence_number(infd, &index->packet_seq_num); | |
1112 | if (ret < 0) { | |
f0b03c22 MD |
1113 | if (ret == -ENOTTY) { |
1114 | /* Command not implemented by lttng-modules. */ | |
1115 | index->packet_seq_num = -1ULL; | |
1116 | ret = 0; | |
1117 | } else { | |
1118 | PERROR("kernctl_get_sequence_number"); | |
1119 | goto error; | |
1120 | } | |
234cd636 JD |
1121 | } |
1122 | index->packet_seq_num = htobe64(index->packet_seq_num); | |
1123 | ||
309167d2 JD |
1124 | error: |
1125 | return ret; | |
1126 | } | |
94d49140 JD |
1127 | /* |
1128 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
1129 | * metadata thread can consumer them. | |
1130 | * | |
1131 | * Metadata stream lock MUST be acquired. | |
1132 | * | |
1133 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream | |
1134 | * is empty or a negative value on error. | |
1135 | */ | |
1136 | int lttng_kconsumer_sync_metadata(struct lttng_consumer_stream *metadata) | |
1137 | { | |
1138 | int ret; | |
1139 | ||
1140 | assert(metadata); | |
1141 | ||
1142 | ret = kernctl_buffer_flush(metadata->wait_fd); | |
1143 | if (ret < 0) { | |
1144 | ERR("Failed to flush kernel stream"); | |
1145 | goto end; | |
1146 | } | |
1147 | ||
1148 | ret = kernctl_snapshot(metadata->wait_fd); | |
1149 | if (ret < 0) { | |
32af2c95 | 1150 | if (ret != -EAGAIN) { |
94d49140 JD |
1151 | ERR("Sync metadata, taking kernel snapshot failed."); |
1152 | goto end; | |
1153 | } | |
1154 | DBG("Sync metadata, no new kernel metadata"); | |
1155 | /* No new metadata, exit. */ | |
1156 | ret = ENODATA; | |
1157 | goto end; | |
1158 | } | |
1159 | ||
1160 | end: | |
1161 | return ret; | |
1162 | } | |
309167d2 | 1163 | |
fb83fe64 JD |
1164 | static |
1165 | int update_stream_stats(struct lttng_consumer_stream *stream) | |
1166 | { | |
1167 | int ret; | |
1168 | uint64_t seq, discarded; | |
1169 | ||
1170 | ret = kernctl_get_sequence_number(stream->wait_fd, &seq); | |
1171 | if (ret < 0) { | |
f0b03c22 MD |
1172 | if (ret == -ENOTTY) { |
1173 | /* Command not implemented by lttng-modules. */ | |
1174 | seq = -1ULL; | |
1175 | ret = 0; | |
1176 | } else { | |
1177 | PERROR("kernctl_get_sequence_number"); | |
1178 | goto end; | |
1179 | } | |
fb83fe64 JD |
1180 | } |
1181 | ||
1182 | /* | |
1183 | * Start the sequence when we extract the first packet in case we don't | |
1184 | * start at 0 (for example if a consumer is not connected to the | |
1185 | * session immediately after the beginning). | |
1186 | */ | |
1187 | if (stream->last_sequence_number == -1ULL) { | |
1188 | stream->last_sequence_number = seq; | |
1189 | } else if (seq > stream->last_sequence_number) { | |
1190 | stream->chan->lost_packets += seq - | |
1191 | stream->last_sequence_number - 1; | |
1192 | } else { | |
1193 | /* seq <= last_sequence_number */ | |
1194 | ERR("Sequence number inconsistent : prev = %" PRIu64 | |
1195 | ", current = %" PRIu64, | |
1196 | stream->last_sequence_number, seq); | |
1197 | ret = -1; | |
1198 | goto end; | |
1199 | } | |
1200 | stream->last_sequence_number = seq; | |
1201 | ||
1202 | ret = kernctl_get_events_discarded(stream->wait_fd, &discarded); | |
1203 | if (ret < 0) { | |
1204 | PERROR("kernctl_get_events_discarded"); | |
1205 | goto end; | |
1206 | } | |
1207 | if (discarded < stream->last_discarded_events) { | |
1208 | /* | |
83f4233d MJ |
1209 | * Overflow has occurred. We assume only one wrap-around |
1210 | * has occurred. | |
fb83fe64 JD |
1211 | */ |
1212 | stream->chan->discarded_events += (1ULL << (CAA_BITS_PER_LONG - 1)) - | |
1213 | stream->last_discarded_events + discarded; | |
1214 | } else { | |
1215 | stream->chan->discarded_events += discarded - | |
1216 | stream->last_discarded_events; | |
1217 | } | |
1218 | stream->last_discarded_events = discarded; | |
1219 | ret = 0; | |
1220 | ||
1221 | end: | |
1222 | return ret; | |
1223 | } | |
1224 | ||
93ec662e JD |
1225 | /* |
1226 | * Check if the local version of the metadata stream matches with the version | |
1227 | * of the metadata stream in the kernel. If it was updated, set the reset flag | |
1228 | * on the stream. | |
1229 | */ | |
1230 | static | |
1231 | int metadata_stream_check_version(int infd, struct lttng_consumer_stream *stream) | |
1232 | { | |
1233 | int ret; | |
1234 | uint64_t cur_version; | |
1235 | ||
1236 | ret = kernctl_get_metadata_version(infd, &cur_version); | |
1237 | if (ret < 0) { | |
f0b03c22 MD |
1238 | if (ret == -ENOTTY) { |
1239 | /* | |
1240 | * LTTng-modules does not implement this | |
1241 | * command. | |
1242 | */ | |
1243 | ret = 0; | |
1244 | goto end; | |
1245 | } | |
93ec662e JD |
1246 | ERR("Failed to get the metadata version"); |
1247 | goto end; | |
1248 | } | |
1249 | ||
1250 | if (stream->metadata_version == cur_version) { | |
1251 | ret = 0; | |
1252 | goto end; | |
1253 | } | |
1254 | ||
1255 | DBG("New metadata version detected"); | |
1256 | stream->metadata_version = cur_version; | |
1257 | stream->reset_metadata_flag = 1; | |
1258 | ret = 0; | |
1259 | ||
1260 | end: | |
1261 | return ret; | |
1262 | } | |
1263 | ||
d41f73b7 MD |
1264 | /* |
1265 | * Consume data on a file descriptor and write it on a trace file. | |
1266 | */ | |
4078b776 | 1267 | ssize_t lttng_kconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
1268 | struct lttng_consumer_local_data *ctx) |
1269 | { | |
1d4dfdef | 1270 | unsigned long len, subbuf_size, padding; |
1c20f0e2 | 1271 | int err, write_index = 1; |
4078b776 | 1272 | ssize_t ret = 0; |
d41f73b7 | 1273 | int infd = stream->wait_fd; |
50adc264 | 1274 | struct ctf_packet_index index; |
d41f73b7 MD |
1275 | |
1276 | DBG("In read_subbuffer (infd : %d)", infd); | |
309167d2 | 1277 | |
d41f73b7 MD |
1278 | /* Get the next subbuffer */ |
1279 | err = kernctl_get_next_subbuf(infd); | |
1280 | if (err != 0) { | |
d41f73b7 MD |
1281 | /* |
1282 | * This is a debug message even for single-threaded consumer, | |
1283 | * because poll() have more relaxed criterions than get subbuf, | |
1284 | * so get_subbuf may fail for short race windows where poll() | |
1285 | * would issue wakeups. | |
1286 | */ | |
1287 | DBG("Reserving sub buffer failed (everything is normal, " | |
1288 | "it is due to concurrency)"); | |
32af2c95 | 1289 | ret = err; |
d41f73b7 MD |
1290 | goto end; |
1291 | } | |
1292 | ||
1d4dfdef DG |
1293 | /* Get the full subbuffer size including padding */ |
1294 | err = kernctl_get_padded_subbuf_size(infd, &len); | |
1295 | if (err != 0) { | |
5a510c9f | 1296 | PERROR("Getting sub-buffer len failed."); |
8265f19e MD |
1297 | err = kernctl_put_subbuf(infd); |
1298 | if (err != 0) { | |
32af2c95 | 1299 | if (err == -EFAULT) { |
5a510c9f | 1300 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1301 | } else if (err == -EIO) { |
8265f19e | 1302 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1303 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e | 1304 | } |
32af2c95 | 1305 | ret = err; |
8265f19e MD |
1306 | goto end; |
1307 | } | |
32af2c95 | 1308 | ret = err; |
1d4dfdef DG |
1309 | goto end; |
1310 | } | |
1311 | ||
1c20f0e2 | 1312 | if (!stream->metadata_flag) { |
309167d2 JD |
1313 | ret = get_index_values(&index, infd); |
1314 | if (ret < 0) { | |
8265f19e MD |
1315 | err = kernctl_put_subbuf(infd); |
1316 | if (err != 0) { | |
32af2c95 | 1317 | if (err == -EFAULT) { |
5a510c9f | 1318 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1319 | } else if (err == -EIO) { |
8265f19e | 1320 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1321 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e | 1322 | } |
32af2c95 | 1323 | ret = err; |
8265f19e MD |
1324 | goto end; |
1325 | } | |
309167d2 JD |
1326 | goto end; |
1327 | } | |
fb83fe64 JD |
1328 | ret = update_stream_stats(stream); |
1329 | if (ret < 0) { | |
becac7c4 MD |
1330 | err = kernctl_put_subbuf(infd); |
1331 | if (err != 0) { | |
1332 | if (err == -EFAULT) { | |
1333 | PERROR("Error in unreserving sub buffer\n"); | |
1334 | } else if (err == -EIO) { | |
1335 | /* Should never happen with newer LTTng versions */ | |
1336 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
1337 | } | |
1338 | ret = err; | |
1339 | goto end; | |
1340 | } | |
fb83fe64 JD |
1341 | goto end; |
1342 | } | |
1c20f0e2 JD |
1343 | } else { |
1344 | write_index = 0; | |
93ec662e JD |
1345 | ret = metadata_stream_check_version(infd, stream); |
1346 | if (ret < 0) { | |
becac7c4 MD |
1347 | err = kernctl_put_subbuf(infd); |
1348 | if (err != 0) { | |
1349 | if (err == -EFAULT) { | |
1350 | PERROR("Error in unreserving sub buffer\n"); | |
1351 | } else if (err == -EIO) { | |
1352 | /* Should never happen with newer LTTng versions */ | |
1353 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
1354 | } | |
1355 | ret = err; | |
1356 | goto end; | |
1357 | } | |
93ec662e JD |
1358 | goto end; |
1359 | } | |
309167d2 JD |
1360 | } |
1361 | ||
ffe60014 | 1362 | switch (stream->chan->output) { |
07b86b52 | 1363 | case CONSUMER_CHANNEL_SPLICE: |
1d4dfdef DG |
1364 | /* |
1365 | * XXX: The lttng-modules splice "actor" does not handle copying | |
1366 | * partial pages hence only using the subbuffer size without the | |
1367 | * padding makes the splice fail. | |
1368 | */ | |
1369 | subbuf_size = len; | |
1370 | padding = 0; | |
1371 | ||
1372 | /* splice the subbuffer to the tracefile */ | |
91dfef6e | 1373 | ret = lttng_consumer_on_read_subbuffer_splice(ctx, stream, subbuf_size, |
309167d2 | 1374 | padding, &index); |
91dfef6e DG |
1375 | /* |
1376 | * XXX: Splice does not support network streaming so the return value | |
1377 | * is simply checked against subbuf_size and not like the mmap() op. | |
1378 | */ | |
1d4dfdef DG |
1379 | if (ret != subbuf_size) { |
1380 | /* | |
1381 | * display the error but continue processing to try | |
1382 | * to release the subbuffer | |
1383 | */ | |
1384 | ERR("Error splicing to tracefile (ret: %zd != len: %lu)", | |
1385 | ret, subbuf_size); | |
309167d2 | 1386 | write_index = 0; |
1d4dfdef DG |
1387 | } |
1388 | break; | |
07b86b52 | 1389 | case CONSUMER_CHANNEL_MMAP: |
1d4dfdef DG |
1390 | /* Get subbuffer size without padding */ |
1391 | err = kernctl_get_subbuf_size(infd, &subbuf_size); | |
1392 | if (err != 0) { | |
5a510c9f | 1393 | PERROR("Getting sub-buffer len failed."); |
8265f19e MD |
1394 | err = kernctl_put_subbuf(infd); |
1395 | if (err != 0) { | |
32af2c95 | 1396 | if (err == -EFAULT) { |
5a510c9f | 1397 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1398 | } else if (err == -EIO) { |
8265f19e | 1399 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1400 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e | 1401 | } |
32af2c95 | 1402 | ret = err; |
8265f19e MD |
1403 | goto end; |
1404 | } | |
32af2c95 | 1405 | ret = err; |
1d4dfdef DG |
1406 | goto end; |
1407 | } | |
47e81c02 | 1408 | |
1d4dfdef DG |
1409 | /* Make sure the tracer is not gone mad on us! */ |
1410 | assert(len >= subbuf_size); | |
1411 | ||
1412 | padding = len - subbuf_size; | |
1413 | ||
1414 | /* write the subbuffer to the tracefile */ | |
91dfef6e | 1415 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, |
309167d2 | 1416 | padding, &index); |
91dfef6e DG |
1417 | /* |
1418 | * The mmap operation should write subbuf_size amount of data when | |
1419 | * network streaming or the full padding (len) size when we are _not_ | |
1420 | * streaming. | |
1421 | */ | |
d88aee68 DG |
1422 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
1423 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
1d4dfdef | 1424 | /* |
91dfef6e | 1425 | * Display the error but continue processing to try to release the |
2336629e DG |
1426 | * subbuffer. This is a DBG statement since this is possible to |
1427 | * happen without being a critical error. | |
1d4dfdef | 1428 | */ |
2336629e | 1429 | DBG("Error writing to tracefile " |
91dfef6e DG |
1430 | "(ret: %zd != len: %lu != subbuf_size: %lu)", |
1431 | ret, len, subbuf_size); | |
309167d2 | 1432 | write_index = 0; |
1d4dfdef DG |
1433 | } |
1434 | break; | |
1435 | default: | |
1436 | ERR("Unknown output method"); | |
56591bac | 1437 | ret = -EPERM; |
d41f73b7 MD |
1438 | } |
1439 | ||
1440 | err = kernctl_put_next_subbuf(infd); | |
1441 | if (err != 0) { | |
32af2c95 | 1442 | if (err == -EFAULT) { |
5a510c9f | 1443 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1444 | } else if (err == -EIO) { |
d41f73b7 | 1445 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1446 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
d41f73b7 | 1447 | } |
32af2c95 | 1448 | ret = err; |
d41f73b7 MD |
1449 | goto end; |
1450 | } | |
1451 | ||
309167d2 | 1452 | /* Write index if needed. */ |
1c20f0e2 JD |
1453 | if (!write_index) { |
1454 | goto end; | |
1455 | } | |
1456 | ||
94d49140 JD |
1457 | if (stream->chan->live_timer_interval && !stream->metadata_flag) { |
1458 | /* | |
1459 | * In live, block until all the metadata is sent. | |
1460 | */ | |
c585821b MD |
1461 | pthread_mutex_lock(&stream->metadata_timer_lock); |
1462 | assert(!stream->missed_metadata_flush); | |
1463 | stream->waiting_on_metadata = true; | |
1464 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1465 | ||
94d49140 | 1466 | err = consumer_stream_sync_metadata(ctx, stream->session_id); |
c585821b MD |
1467 | |
1468 | pthread_mutex_lock(&stream->metadata_timer_lock); | |
1469 | stream->waiting_on_metadata = false; | |
1470 | if (stream->missed_metadata_flush) { | |
1471 | stream->missed_metadata_flush = false; | |
1472 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1473 | (void) consumer_flush_kernel_index(stream); | |
1474 | } else { | |
1475 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1476 | } | |
94d49140 JD |
1477 | if (err < 0) { |
1478 | goto end; | |
1479 | } | |
1480 | } | |
1481 | ||
1c20f0e2 JD |
1482 | err = consumer_stream_write_index(stream, &index); |
1483 | if (err < 0) { | |
1484 | goto end; | |
309167d2 JD |
1485 | } |
1486 | ||
d41f73b7 MD |
1487 | end: |
1488 | return ret; | |
1489 | } | |
1490 | ||
1491 | int lttng_kconsumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
1492 | { | |
1493 | int ret; | |
ffe60014 DG |
1494 | |
1495 | assert(stream); | |
1496 | ||
2bba9e53 DG |
1497 | /* |
1498 | * Don't create anything if this is set for streaming or should not be | |
1499 | * monitored. | |
1500 | */ | |
1501 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { | |
fe4477ee JD |
1502 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
1503 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
309167d2 | 1504 | stream->uid, stream->gid, NULL); |
fe4477ee JD |
1505 | if (ret < 0) { |
1506 | goto error; | |
1507 | } | |
1508 | stream->out_fd = ret; | |
1509 | stream->tracefile_size_current = 0; | |
309167d2 JD |
1510 | |
1511 | if (!stream->metadata_flag) { | |
e0547b83 MD |
1512 | struct lttng_index_file *index_file; |
1513 | ||
1514 | index_file = lttng_index_file_create(stream->chan->pathname, | |
309167d2 JD |
1515 | stream->name, stream->uid, stream->gid, |
1516 | stream->chan->tracefile_size, | |
e0547b83 MD |
1517 | stream->tracefile_count_current, |
1518 | CTF_INDEX_MAJOR, CTF_INDEX_MINOR); | |
1519 | if (!index_file) { | |
309167d2 JD |
1520 | goto error; |
1521 | } | |
e0547b83 | 1522 | stream->index_file = index_file; |
309167d2 | 1523 | } |
ffe60014 | 1524 | } |
d41f73b7 | 1525 | |
d41f73b7 MD |
1526 | if (stream->output == LTTNG_EVENT_MMAP) { |
1527 | /* get the len of the mmap region */ | |
1528 | unsigned long mmap_len; | |
1529 | ||
1530 | ret = kernctl_get_mmap_len(stream->wait_fd, &mmap_len); | |
1531 | if (ret != 0) { | |
ffe60014 | 1532 | PERROR("kernctl_get_mmap_len"); |
d41f73b7 MD |
1533 | goto error_close_fd; |
1534 | } | |
1535 | stream->mmap_len = (size_t) mmap_len; | |
1536 | ||
ffe60014 DG |
1537 | stream->mmap_base = mmap(NULL, stream->mmap_len, PROT_READ, |
1538 | MAP_PRIVATE, stream->wait_fd, 0); | |
d41f73b7 | 1539 | if (stream->mmap_base == MAP_FAILED) { |
ffe60014 | 1540 | PERROR("Error mmaping"); |
d41f73b7 MD |
1541 | ret = -1; |
1542 | goto error_close_fd; | |
1543 | } | |
1544 | } | |
1545 | ||
1546 | /* we return 0 to let the library handle the FD internally */ | |
1547 | return 0; | |
1548 | ||
1549 | error_close_fd: | |
2f225ce2 | 1550 | if (stream->out_fd >= 0) { |
d41f73b7 MD |
1551 | int err; |
1552 | ||
1553 | err = close(stream->out_fd); | |
1554 | assert(!err); | |
2f225ce2 | 1555 | stream->out_fd = -1; |
d41f73b7 MD |
1556 | } |
1557 | error: | |
1558 | return ret; | |
1559 | } | |
1560 | ||
ca22feea DG |
1561 | /* |
1562 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
1563 | * stream. Consumer data lock MUST be acquired before calling this function |
1564 | * and the stream lock. | |
ca22feea | 1565 | * |
6d805429 | 1566 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
1567 | * data is available for trace viewer reading. |
1568 | */ | |
6d805429 | 1569 | int lttng_kconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
1570 | { |
1571 | int ret; | |
1572 | ||
1573 | assert(stream); | |
1574 | ||
873b9e9a MD |
1575 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
1576 | ret = 0; | |
1577 | goto end; | |
1578 | } | |
1579 | ||
ca22feea DG |
1580 | ret = kernctl_get_next_subbuf(stream->wait_fd); |
1581 | if (ret == 0) { | |
1582 | /* There is still data so let's put back this subbuffer. */ | |
1583 | ret = kernctl_put_subbuf(stream->wait_fd); | |
1584 | assert(ret == 0); | |
6d805429 | 1585 | ret = 1; /* Data is pending */ |
4e9a4686 | 1586 | goto end; |
ca22feea DG |
1587 | } |
1588 | ||
6d805429 DG |
1589 | /* Data is NOT pending and ready to be read. */ |
1590 | ret = 0; | |
ca22feea | 1591 | |
6efae65e DG |
1592 | end: |
1593 | return ret; | |
ca22feea | 1594 | } |