Commit | Line | Data |
---|---|---|
3bd1e081 | 1 | /* |
90c106c6 | 2 | * Copyright (C) 2011 EfficiOS Inc. |
ab5be9fa MJ |
3 | * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
4 | * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
3bd1e081 | 5 | * |
ab5be9fa | 6 | * SPDX-License-Identifier: GPL-2.0-only |
3bd1e081 | 7 | * |
3bd1e081 MD |
8 | */ |
9 | ||
6c1c0768 | 10 | #define _LGPL_SOURCE |
3bd1e081 | 11 | #include <assert.h> |
3bd1e081 MD |
12 | #include <poll.h> |
13 | #include <pthread.h> | |
14 | #include <stdlib.h> | |
15 | #include <string.h> | |
16 | #include <sys/mman.h> | |
17 | #include <sys/socket.h> | |
18 | #include <sys/types.h> | |
77c7c900 | 19 | #include <inttypes.h> |
3bd1e081 | 20 | #include <unistd.h> |
dbb5dfe6 | 21 | #include <sys/stat.h> |
f5ba75b4 | 22 | #include <stdint.h> |
3bd1e081 | 23 | |
51a9e1c7 | 24 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 25 | #include <common/common.h> |
10a8a223 | 26 | #include <common/kernel-ctl/kernel-ctl.h> |
10a8a223 | 27 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 28 | #include <common/sessiond-comm/relayd.h> |
dbb5dfe6 | 29 | #include <common/compat/fcntl.h> |
f263b7fd | 30 | #include <common/compat/endian.h> |
acdb9057 | 31 | #include <common/pipe.h> |
00e2e675 | 32 | #include <common/relayd/relayd.h> |
fe4477ee | 33 | #include <common/utils.h> |
c8fea79c | 34 | #include <common/consumer/consumer-stream.h> |
309167d2 | 35 | #include <common/index/index.h> |
c8fea79c | 36 | #include <common/consumer/consumer-timer.h> |
d2956687 | 37 | #include <common/optional.h> |
6f9449c2 JG |
38 | #include <common/buffer-view.h> |
39 | #include <common/consumer/consumer.h> | |
f5ba75b4 | 40 | #include <common/consumer/metadata-bucket.h> |
0857097f | 41 | |
10a8a223 | 42 | #include "kernel-consumer.h" |
3bd1e081 | 43 | |
fa29bfbf | 44 | extern struct lttng_consumer_global_data the_consumer_data; |
3bd1e081 | 45 | extern int consumer_poll_timeout; |
3bd1e081 | 46 | |
3bd1e081 MD |
47 | /* |
48 | * Take a snapshot for a specific fd | |
49 | * | |
50 | * Returns 0 on success, < 0 on error | |
51 | */ | |
ffe60014 | 52 | int lttng_kconsumer_take_snapshot(struct lttng_consumer_stream *stream) |
3bd1e081 MD |
53 | { |
54 | int ret = 0; | |
55 | int infd = stream->wait_fd; | |
56 | ||
57 | ret = kernctl_snapshot(infd); | |
d2d2f190 JD |
58 | /* |
59 | * -EAGAIN is not an error, it just means that there is no data to | |
60 | * be read. | |
61 | */ | |
62 | if (ret != 0 && ret != -EAGAIN) { | |
5a510c9f | 63 | PERROR("Getting sub-buffer snapshot."); |
3bd1e081 MD |
64 | } |
65 | ||
66 | return ret; | |
67 | } | |
68 | ||
e9404c27 JG |
69 | /* |
70 | * Sample consumed and produced positions for a specific fd. | |
71 | * | |
72 | * Returns 0 on success, < 0 on error. | |
73 | */ | |
74 | int lttng_kconsumer_sample_snapshot_positions( | |
75 | struct lttng_consumer_stream *stream) | |
76 | { | |
77 | assert(stream); | |
78 | ||
79 | return kernctl_snapshot_sample_positions(stream->wait_fd); | |
80 | } | |
81 | ||
3bd1e081 MD |
82 | /* |
83 | * Get the produced position | |
84 | * | |
85 | * Returns 0 on success, < 0 on error | |
86 | */ | |
ffe60014 | 87 | int lttng_kconsumer_get_produced_snapshot(struct lttng_consumer_stream *stream, |
3bd1e081 MD |
88 | unsigned long *pos) |
89 | { | |
90 | int ret; | |
91 | int infd = stream->wait_fd; | |
92 | ||
93 | ret = kernctl_snapshot_get_produced(infd, pos); | |
94 | if (ret != 0) { | |
5a510c9f | 95 | PERROR("kernctl_snapshot_get_produced"); |
3bd1e081 MD |
96 | } |
97 | ||
98 | return ret; | |
99 | } | |
100 | ||
07b86b52 JD |
101 | /* |
102 | * Get the consumerd position | |
103 | * | |
104 | * Returns 0 on success, < 0 on error | |
105 | */ | |
106 | int lttng_kconsumer_get_consumed_snapshot(struct lttng_consumer_stream *stream, | |
107 | unsigned long *pos) | |
108 | { | |
109 | int ret; | |
110 | int infd = stream->wait_fd; | |
111 | ||
112 | ret = kernctl_snapshot_get_consumed(infd, pos); | |
113 | if (ret != 0) { | |
5a510c9f | 114 | PERROR("kernctl_snapshot_get_consumed"); |
07b86b52 JD |
115 | } |
116 | ||
117 | return ret; | |
118 | } | |
119 | ||
128708c3 JG |
120 | static |
121 | int get_current_subbuf_addr(struct lttng_consumer_stream *stream, | |
122 | const char **addr) | |
123 | { | |
124 | int ret; | |
125 | unsigned long mmap_offset; | |
126 | const char *mmap_base = stream->mmap_base; | |
127 | ||
128 | ret = kernctl_get_mmap_read_offset(stream->wait_fd, &mmap_offset); | |
129 | if (ret < 0) { | |
130 | PERROR("Failed to get mmap read offset"); | |
131 | goto error; | |
132 | } | |
133 | ||
134 | *addr = mmap_base + mmap_offset; | |
135 | error: | |
136 | return ret; | |
137 | } | |
138 | ||
07b86b52 JD |
139 | /* |
140 | * Take a snapshot of all the stream of a channel | |
3eb928aa | 141 | * RCU read-side lock must be held across this function to ensure existence of |
a48ac75a | 142 | * channel. |
07b86b52 JD |
143 | * |
144 | * Returns 0 on success, < 0 on error | |
145 | */ | |
f72bb42f JG |
146 | static int lttng_kconsumer_snapshot_channel( |
147 | struct lttng_consumer_channel *channel, | |
148 | uint64_t key, char *path, uint64_t relayd_id, | |
149 | uint64_t nb_packets_per_stream, | |
5c786ded | 150 | struct lttng_consumer_local_data *ctx) |
07b86b52 JD |
151 | { |
152 | int ret; | |
07b86b52 JD |
153 | struct lttng_consumer_stream *stream; |
154 | ||
6a00837f | 155 | DBG("Kernel consumer snapshot channel %" PRIu64, key); |
07b86b52 | 156 | |
a48ac75a JR |
157 | /* Prevent channel modifications while we perform the snapshot.*/ |
158 | pthread_mutex_lock(&channel->lock); | |
159 | ||
07b86b52 JD |
160 | rcu_read_lock(); |
161 | ||
07b86b52 JD |
162 | /* Splice is not supported yet for channel snapshot. */ |
163 | if (channel->output != CONSUMER_CHANNEL_MMAP) { | |
9381314c JG |
164 | ERR("Unsupported output type for channel \"%s\": mmap output is required to record a snapshot", |
165 | channel->name); | |
07b86b52 JD |
166 | ret = -1; |
167 | goto end; | |
168 | } | |
169 | ||
10a50311 | 170 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { |
923333cd | 171 | unsigned long consumed_pos, produced_pos; |
9ce5646a MD |
172 | |
173 | health_code_update(); | |
174 | ||
07b86b52 JD |
175 | /* |
176 | * Lock stream because we are about to change its state. | |
177 | */ | |
178 | pthread_mutex_lock(&stream->lock); | |
179 | ||
d2956687 JG |
180 | assert(channel->trace_chunk); |
181 | if (!lttng_trace_chunk_get(channel->trace_chunk)) { | |
182 | /* | |
183 | * Can't happen barring an internal error as the channel | |
184 | * holds a reference to the trace chunk. | |
185 | */ | |
186 | ERR("Failed to acquire reference to channel's trace chunk"); | |
187 | ret = -1; | |
188 | goto end_unlock; | |
189 | } | |
190 | assert(!stream->trace_chunk); | |
191 | stream->trace_chunk = channel->trace_chunk; | |
192 | ||
29decac3 DG |
193 | /* |
194 | * Assign the received relayd ID so we can use it for streaming. The streams | |
195 | * are not visible to anyone so this is OK to change it. | |
196 | */ | |
07b86b52 JD |
197 | stream->net_seq_idx = relayd_id; |
198 | channel->relayd_id = relayd_id; | |
199 | if (relayd_id != (uint64_t) -1ULL) { | |
10a50311 | 200 | ret = consumer_send_relayd_stream(stream, path); |
07b86b52 JD |
201 | if (ret < 0) { |
202 | ERR("sending stream to relayd"); | |
203 | goto end_unlock; | |
204 | } | |
07b86b52 | 205 | } else { |
d2956687 JG |
206 | ret = consumer_stream_create_output_files(stream, |
207 | false); | |
07b86b52 | 208 | if (ret < 0) { |
07b86b52 JD |
209 | goto end_unlock; |
210 | } | |
d2956687 JG |
211 | DBG("Kernel consumer snapshot stream (%" PRIu64 ")", |
212 | stream->key); | |
07b86b52 JD |
213 | } |
214 | ||
f22dd891 | 215 | ret = kernctl_buffer_flush_empty(stream->wait_fd); |
07b86b52 | 216 | if (ret < 0) { |
f22dd891 MD |
217 | /* |
218 | * Doing a buffer flush which does not take into | |
219 | * account empty packets. This is not perfect | |
220 | * for stream intersection, but required as a | |
221 | * fall-back when "flush_empty" is not | |
222 | * implemented by lttng-modules. | |
223 | */ | |
224 | ret = kernctl_buffer_flush(stream->wait_fd); | |
225 | if (ret < 0) { | |
226 | ERR("Failed to flush kernel stream"); | |
227 | goto end_unlock; | |
228 | } | |
07b86b52 JD |
229 | goto end_unlock; |
230 | } | |
231 | ||
232 | ret = lttng_kconsumer_take_snapshot(stream); | |
233 | if (ret < 0) { | |
234 | ERR("Taking kernel snapshot"); | |
235 | goto end_unlock; | |
236 | } | |
237 | ||
238 | ret = lttng_kconsumer_get_produced_snapshot(stream, &produced_pos); | |
239 | if (ret < 0) { | |
240 | ERR("Produced kernel snapshot position"); | |
241 | goto end_unlock; | |
242 | } | |
243 | ||
244 | ret = lttng_kconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
245 | if (ret < 0) { | |
246 | ERR("Consumerd kernel snapshot position"); | |
247 | goto end_unlock; | |
248 | } | |
249 | ||
d07ceecd MD |
250 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
251 | produced_pos, nb_packets_per_stream, | |
252 | stream->max_sb_size); | |
5c786ded | 253 | |
9377d830 | 254 | while ((long) (consumed_pos - produced_pos) < 0) { |
07b86b52 JD |
255 | ssize_t read_len; |
256 | unsigned long len, padded_len; | |
128708c3 | 257 | const char *subbuf_addr; |
fd424d99 | 258 | struct lttng_buffer_view subbuf_view; |
07b86b52 | 259 | |
9ce5646a | 260 | health_code_update(); |
07b86b52 JD |
261 | DBG("Kernel consumer taking snapshot at pos %lu", consumed_pos); |
262 | ||
263 | ret = kernctl_get_subbuf(stream->wait_fd, &consumed_pos); | |
264 | if (ret < 0) { | |
32af2c95 | 265 | if (ret != -EAGAIN) { |
07b86b52 JD |
266 | PERROR("kernctl_get_subbuf snapshot"); |
267 | goto end_unlock; | |
268 | } | |
269 | DBG("Kernel consumer get subbuf failed. Skipping it."); | |
270 | consumed_pos += stream->max_sb_size; | |
ddc93ee4 | 271 | stream->chan->lost_packets++; |
07b86b52 JD |
272 | continue; |
273 | } | |
274 | ||
275 | ret = kernctl_get_subbuf_size(stream->wait_fd, &len); | |
276 | if (ret < 0) { | |
277 | ERR("Snapshot kernctl_get_subbuf_size"); | |
29decac3 | 278 | goto error_put_subbuf; |
07b86b52 JD |
279 | } |
280 | ||
281 | ret = kernctl_get_padded_subbuf_size(stream->wait_fd, &padded_len); | |
282 | if (ret < 0) { | |
283 | ERR("Snapshot kernctl_get_padded_subbuf_size"); | |
29decac3 | 284 | goto error_put_subbuf; |
07b86b52 JD |
285 | } |
286 | ||
128708c3 JG |
287 | ret = get_current_subbuf_addr(stream, &subbuf_addr); |
288 | if (ret) { | |
289 | goto error_put_subbuf; | |
290 | } | |
291 | ||
fd424d99 JG |
292 | subbuf_view = lttng_buffer_view_init( |
293 | subbuf_addr, 0, padded_len); | |
f5ba75b4 | 294 | read_len = lttng_consumer_on_read_subbuffer_mmap( |
fd424d99 | 295 | stream, &subbuf_view, |
6f9449c2 | 296 | padded_len - len); |
07b86b52 | 297 | /* |
29decac3 DG |
298 | * We write the padded len in local tracefiles but the data len |
299 | * when using a relay. Display the error but continue processing | |
300 | * to try to release the subbuffer. | |
07b86b52 JD |
301 | */ |
302 | if (relayd_id != (uint64_t) -1ULL) { | |
303 | if (read_len != len) { | |
304 | ERR("Error sending to the relay (ret: %zd != len: %lu)", | |
305 | read_len, len); | |
306 | } | |
307 | } else { | |
308 | if (read_len != padded_len) { | |
309 | ERR("Error writing to tracefile (ret: %zd != len: %lu)", | |
310 | read_len, padded_len); | |
311 | } | |
312 | } | |
313 | ||
314 | ret = kernctl_put_subbuf(stream->wait_fd); | |
315 | if (ret < 0) { | |
316 | ERR("Snapshot kernctl_put_subbuf"); | |
317 | goto end_unlock; | |
318 | } | |
319 | consumed_pos += stream->max_sb_size; | |
320 | } | |
321 | ||
322 | if (relayd_id == (uint64_t) -1ULL) { | |
fdf9986c MD |
323 | if (stream->out_fd >= 0) { |
324 | ret = close(stream->out_fd); | |
325 | if (ret < 0) { | |
326 | PERROR("Kernel consumer snapshot close out_fd"); | |
327 | goto end_unlock; | |
328 | } | |
329 | stream->out_fd = -1; | |
07b86b52 | 330 | } |
07b86b52 JD |
331 | } else { |
332 | close_relayd_stream(stream); | |
333 | stream->net_seq_idx = (uint64_t) -1ULL; | |
334 | } | |
d2956687 JG |
335 | lttng_trace_chunk_put(stream->trace_chunk); |
336 | stream->trace_chunk = NULL; | |
07b86b52 JD |
337 | pthread_mutex_unlock(&stream->lock); |
338 | } | |
339 | ||
340 | /* All good! */ | |
341 | ret = 0; | |
342 | goto end; | |
343 | ||
29decac3 DG |
344 | error_put_subbuf: |
345 | ret = kernctl_put_subbuf(stream->wait_fd); | |
346 | if (ret < 0) { | |
347 | ERR("Snapshot kernctl_put_subbuf error path"); | |
348 | } | |
07b86b52 JD |
349 | end_unlock: |
350 | pthread_mutex_unlock(&stream->lock); | |
351 | end: | |
352 | rcu_read_unlock(); | |
a48ac75a | 353 | pthread_mutex_unlock(&channel->lock); |
07b86b52 JD |
354 | return ret; |
355 | } | |
356 | ||
357 | /* | |
358 | * Read the whole metadata available for a snapshot. | |
3eb928aa | 359 | * RCU read-side lock must be held across this function to ensure existence of |
a48ac75a | 360 | * metadata_channel. |
07b86b52 JD |
361 | * |
362 | * Returns 0 on success, < 0 on error | |
363 | */ | |
d2956687 JG |
364 | static int lttng_kconsumer_snapshot_metadata( |
365 | struct lttng_consumer_channel *metadata_channel, | |
3eb928aa MD |
366 | uint64_t key, char *path, uint64_t relayd_id, |
367 | struct lttng_consumer_local_data *ctx) | |
07b86b52 | 368 | { |
d771f832 DG |
369 | int ret, use_relayd = 0; |
370 | ssize_t ret_read; | |
07b86b52 | 371 | struct lttng_consumer_stream *metadata_stream; |
d771f832 DG |
372 | |
373 | assert(ctx); | |
07b86b52 JD |
374 | |
375 | DBG("Kernel consumer snapshot metadata with key %" PRIu64 " at path %s", | |
376 | key, path); | |
377 | ||
378 | rcu_read_lock(); | |
379 | ||
07b86b52 JD |
380 | metadata_stream = metadata_channel->metadata_stream; |
381 | assert(metadata_stream); | |
d2956687 | 382 | |
a48ac75a | 383 | metadata_stream->read_subbuffer_ops.lock(metadata_stream); |
d2956687 JG |
384 | assert(metadata_channel->trace_chunk); |
385 | assert(metadata_stream->trace_chunk); | |
07b86b52 | 386 | |
d771f832 | 387 | /* Flag once that we have a valid relayd for the stream. */ |
e2039c7a | 388 | if (relayd_id != (uint64_t) -1ULL) { |
d771f832 DG |
389 | use_relayd = 1; |
390 | } | |
391 | ||
392 | if (use_relayd) { | |
10a50311 | 393 | ret = consumer_send_relayd_stream(metadata_stream, path); |
e2039c7a | 394 | if (ret < 0) { |
fa27abe8 | 395 | goto error_snapshot; |
e2039c7a | 396 | } |
e2039c7a | 397 | } else { |
d2956687 JG |
398 | ret = consumer_stream_create_output_files(metadata_stream, |
399 | false); | |
e2039c7a | 400 | if (ret < 0) { |
fa27abe8 | 401 | goto error_snapshot; |
e2039c7a | 402 | } |
07b86b52 | 403 | } |
07b86b52 | 404 | |
d771f832 | 405 | do { |
9ce5646a MD |
406 | health_code_update(); |
407 | ||
6f9449c2 | 408 | ret_read = lttng_consumer_read_subbuffer(metadata_stream, ctx, true); |
d771f832 | 409 | if (ret_read < 0) { |
684c6783 MD |
410 | ERR("Kernel snapshot reading metadata subbuffer (ret: %zd)", |
411 | ret_read); | |
412 | ret = ret_read; | |
413 | goto error_snapshot; | |
07b86b52 | 414 | } |
684c6783 | 415 | } while (ret_read > 0); |
07b86b52 | 416 | |
d771f832 DG |
417 | if (use_relayd) { |
418 | close_relayd_stream(metadata_stream); | |
419 | metadata_stream->net_seq_idx = (uint64_t) -1ULL; | |
420 | } else { | |
fdf9986c MD |
421 | if (metadata_stream->out_fd >= 0) { |
422 | ret = close(metadata_stream->out_fd); | |
423 | if (ret < 0) { | |
424 | PERROR("Kernel consumer snapshot metadata close out_fd"); | |
425 | /* | |
426 | * Don't go on error here since the snapshot was successful at this | |
427 | * point but somehow the close failed. | |
428 | */ | |
429 | } | |
430 | metadata_stream->out_fd = -1; | |
d2956687 JG |
431 | lttng_trace_chunk_put(metadata_stream->trace_chunk); |
432 | metadata_stream->trace_chunk = NULL; | |
e2039c7a | 433 | } |
e2039c7a JD |
434 | } |
435 | ||
07b86b52 | 436 | ret = 0; |
fa27abe8 | 437 | error_snapshot: |
a48ac75a | 438 | metadata_stream->read_subbuffer_ops.unlock(metadata_stream); |
cf53a8a6 JD |
439 | cds_list_del(&metadata_stream->send_node); |
440 | consumer_stream_destroy(metadata_stream, NULL); | |
441 | metadata_channel->metadata_stream = NULL; | |
07b86b52 JD |
442 | rcu_read_unlock(); |
443 | return ret; | |
444 | } | |
445 | ||
1803a064 MD |
446 | /* |
447 | * Receive command from session daemon and process it. | |
448 | * | |
449 | * Return 1 on success else a negative value or 0. | |
450 | */ | |
3bd1e081 MD |
451 | int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
452 | int sock, struct pollfd *consumer_sockpoll) | |
453 | { | |
0c5b3718 | 454 | int ret_func; |
0c759fc9 | 455 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 MD |
456 | struct lttcomm_consumer_msg msg; |
457 | ||
9ce5646a MD |
458 | health_code_update(); |
459 | ||
0c5b3718 SM |
460 | { |
461 | ssize_t ret_recv; | |
462 | ||
463 | ret_recv = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); | |
464 | if (ret_recv != sizeof(msg)) { | |
465 | if (ret_recv > 0) { | |
466 | lttng_consumer_send_error(ctx, | |
467 | LTTCOMM_CONSUMERD_ERROR_RECV_CMD); | |
468 | ret_recv = -1; | |
469 | } | |
470 | return ret_recv; | |
1803a064 | 471 | } |
3bd1e081 | 472 | } |
9ce5646a MD |
473 | |
474 | health_code_update(); | |
475 | ||
84382d49 MD |
476 | /* Deprecated command */ |
477 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 478 | |
9ce5646a MD |
479 | health_code_update(); |
480 | ||
b0b335c8 MD |
481 | /* relayd needs RCU read-side protection */ |
482 | rcu_read_lock(); | |
483 | ||
3bd1e081 | 484 | switch (msg.cmd_type) { |
00e2e675 DG |
485 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
486 | { | |
fe7bf564 JR |
487 | uint32_t major = msg.u.relayd_sock.major; |
488 | uint32_t minor = msg.u.relayd_sock.minor; | |
489 | enum lttcomm_sock_proto protocol = (enum lttcomm_sock_proto) | |
490 | msg.u.relayd_sock.relayd_socket_protocol; | |
491 | ||
f50f23d9 | 492 | /* Session daemon status message are handled in the following call. */ |
2527bf85 | 493 | consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
fe7bf564 JR |
494 | msg.u.relayd_sock.type, ctx, sock, |
495 | consumer_sockpoll, msg.u.relayd_sock.session_id, | |
496 | msg.u.relayd_sock.relayd_session_id, major, | |
497 | minor, protocol); | |
00e2e675 DG |
498 | goto end_nosignal; |
499 | } | |
3bd1e081 MD |
500 | case LTTNG_CONSUMER_ADD_CHANNEL: |
501 | { | |
502 | struct lttng_consumer_channel *new_channel; | |
afbf29db | 503 | int ret_send_status, ret_add_channel = 0; |
d2956687 | 504 | const uint64_t chunk_id = msg.u.channel.chunk_id.value; |
3bd1e081 | 505 | |
9ce5646a MD |
506 | health_code_update(); |
507 | ||
f50f23d9 | 508 | /* First send a status message before receiving the fds. */ |
0c5b3718 SM |
509 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
510 | if (ret_send_status < 0) { | |
f50f23d9 | 511 | /* Somehow, the session daemon is not responding anymore. */ |
1803a064 | 512 | goto error_fatal; |
f50f23d9 | 513 | } |
9ce5646a MD |
514 | |
515 | health_code_update(); | |
516 | ||
d88aee68 | 517 | DBG("consumer_add_channel %" PRIu64, msg.u.channel.channel_key); |
3bd1e081 | 518 | new_channel = consumer_allocate_channel(msg.u.channel.channel_key, |
d2956687 JG |
519 | msg.u.channel.session_id, |
520 | msg.u.channel.chunk_id.is_set ? | |
521 | &chunk_id : NULL, | |
522 | msg.u.channel.pathname, | |
523 | msg.u.channel.name, | |
1624d5b7 JD |
524 | msg.u.channel.relayd_id, msg.u.channel.output, |
525 | msg.u.channel.tracefile_size, | |
1950109e | 526 | msg.u.channel.tracefile_count, 0, |
ecc48a90 | 527 | msg.u.channel.monitor, |
d7ba1388 | 528 | msg.u.channel.live_timer_interval, |
a2814ea7 | 529 | msg.u.channel.is_live, |
3d071855 | 530 | NULL, NULL); |
3bd1e081 | 531 | if (new_channel == NULL) { |
f73fabfd | 532 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
3bd1e081 MD |
533 | goto end_nosignal; |
534 | } | |
ffe60014 | 535 | new_channel->nb_init_stream_left = msg.u.channel.nb_init_streams; |
95a1109b JD |
536 | switch (msg.u.channel.output) { |
537 | case LTTNG_EVENT_SPLICE: | |
538 | new_channel->output = CONSUMER_CHANNEL_SPLICE; | |
539 | break; | |
540 | case LTTNG_EVENT_MMAP: | |
541 | new_channel->output = CONSUMER_CHANNEL_MMAP; | |
542 | break; | |
543 | default: | |
544 | ERR("Channel output unknown %d", msg.u.channel.output); | |
545 | goto end_nosignal; | |
546 | } | |
ffe60014 DG |
547 | |
548 | /* Translate and save channel type. */ | |
549 | switch (msg.u.channel.type) { | |
550 | case CONSUMER_CHANNEL_TYPE_DATA: | |
551 | case CONSUMER_CHANNEL_TYPE_METADATA: | |
552 | new_channel->type = msg.u.channel.type; | |
553 | break; | |
554 | default: | |
555 | assert(0); | |
556 | goto end_nosignal; | |
557 | }; | |
558 | ||
9ce5646a MD |
559 | health_code_update(); |
560 | ||
3bd1e081 | 561 | if (ctx->on_recv_channel != NULL) { |
0c5b3718 SM |
562 | int ret_recv_channel = |
563 | ctx->on_recv_channel(new_channel); | |
564 | if (ret_recv_channel == 0) { | |
565 | ret_add_channel = consumer_add_channel( | |
566 | new_channel, ctx); | |
567 | } else if (ret_recv_channel < 0) { | |
3bd1e081 MD |
568 | goto end_nosignal; |
569 | } | |
570 | } else { | |
0c5b3718 SM |
571 | ret_add_channel = |
572 | consumer_add_channel(new_channel, ctx); | |
3bd1e081 | 573 | } |
0c5b3718 SM |
574 | if (msg.u.channel.type == CONSUMER_CHANNEL_TYPE_DATA && |
575 | !ret_add_channel) { | |
e9404c27 JG |
576 | int monitor_start_ret; |
577 | ||
578 | DBG("Consumer starting monitor timer"); | |
94d49140 JD |
579 | consumer_timer_live_start(new_channel, |
580 | msg.u.channel.live_timer_interval); | |
e9404c27 JG |
581 | monitor_start_ret = consumer_timer_monitor_start( |
582 | new_channel, | |
583 | msg.u.channel.monitor_timer_interval); | |
584 | if (monitor_start_ret < 0) { | |
585 | ERR("Starting channel monitoring timer failed"); | |
586 | goto end_nosignal; | |
587 | } | |
94d49140 | 588 | } |
e43c41c5 | 589 | |
9ce5646a MD |
590 | health_code_update(); |
591 | ||
e43c41c5 | 592 | /* If we received an error in add_channel, we need to report it. */ |
0c5b3718 SM |
593 | if (ret_add_channel < 0) { |
594 | ret_send_status = consumer_send_status_msg( | |
595 | sock, ret_add_channel); | |
596 | if (ret_send_status < 0) { | |
1803a064 MD |
597 | goto error_fatal; |
598 | } | |
e43c41c5 JD |
599 | goto end_nosignal; |
600 | } | |
601 | ||
3bd1e081 MD |
602 | goto end_nosignal; |
603 | } | |
604 | case LTTNG_CONSUMER_ADD_STREAM: | |
605 | { | |
dae10966 DG |
606 | int fd; |
607 | struct lttng_pipe *stream_pipe; | |
00e2e675 | 608 | struct lttng_consumer_stream *new_stream; |
ffe60014 | 609 | struct lttng_consumer_channel *channel; |
c80048c6 | 610 | int alloc_ret = 0; |
0c5b3718 SM |
611 | int ret_send_status, ret_poll, ret_get_max_subbuf_size; |
612 | ssize_t ret_pipe_write, ret_recv; | |
3bd1e081 | 613 | |
ffe60014 DG |
614 | /* |
615 | * Get stream's channel reference. Needed when adding the stream to the | |
616 | * global hash table. | |
617 | */ | |
618 | channel = consumer_find_channel(msg.u.stream.channel_key); | |
619 | if (!channel) { | |
620 | /* | |
621 | * We could not find the channel. Can happen if cpu hotplug | |
622 | * happens while tearing down. | |
623 | */ | |
d88aee68 | 624 | ERR("Unable to find channel key %" PRIu64, msg.u.stream.channel_key); |
e462382a | 625 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
ffe60014 DG |
626 | } |
627 | ||
9ce5646a MD |
628 | health_code_update(); |
629 | ||
f50f23d9 | 630 | /* First send a status message before receiving the fds. */ |
0c5b3718 SM |
631 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
632 | if (ret_send_status < 0) { | |
d771f832 | 633 | /* Somehow, the session daemon is not responding anymore. */ |
c5c7998f | 634 | goto error_add_stream_fatal; |
1803a064 | 635 | } |
9ce5646a MD |
636 | |
637 | health_code_update(); | |
638 | ||
0c759fc9 | 639 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
d771f832 | 640 | /* Channel was not found. */ |
c5c7998f | 641 | goto error_add_stream_nosignal; |
f50f23d9 DG |
642 | } |
643 | ||
d771f832 | 644 | /* Blocking call */ |
9ce5646a | 645 | health_poll_entry(); |
0c5b3718 | 646 | ret_poll = lttng_consumer_poll_socket(consumer_sockpoll); |
9ce5646a | 647 | health_poll_exit(); |
0c5b3718 | 648 | if (ret_poll) { |
c5c7998f | 649 | goto error_add_stream_fatal; |
3bd1e081 | 650 | } |
00e2e675 | 651 | |
9ce5646a MD |
652 | health_code_update(); |
653 | ||
00e2e675 | 654 | /* Get stream file descriptor from socket */ |
0c5b3718 SM |
655 | ret_recv = lttcomm_recv_fds_unix_sock(sock, &fd, 1); |
656 | if (ret_recv != sizeof(fd)) { | |
f73fabfd | 657 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
0c5b3718 | 658 | ret_func = ret_recv; |
c5c7998f | 659 | goto end; |
3bd1e081 | 660 | } |
3bd1e081 | 661 | |
9ce5646a MD |
662 | health_code_update(); |
663 | ||
f50f23d9 DG |
664 | /* |
665 | * Send status code to session daemon only if the recv works. If the | |
666 | * above recv() failed, the session daemon is notified through the | |
667 | * error socket and the teardown is eventually done. | |
668 | */ | |
0c5b3718 SM |
669 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
670 | if (ret_send_status < 0) { | |
f50f23d9 | 671 | /* Somehow, the session daemon is not responding anymore. */ |
c5c7998f | 672 | goto error_add_stream_nosignal; |
f50f23d9 DG |
673 | } |
674 | ||
9ce5646a MD |
675 | health_code_update(); |
676 | ||
d2956687 | 677 | pthread_mutex_lock(&channel->lock); |
6f9449c2 | 678 | new_stream = consumer_stream_create( |
49f45573 JG |
679 | channel, |
680 | channel->key, | |
ffe60014 | 681 | fd, |
ffe60014 | 682 | channel->name, |
ffe60014 DG |
683 | channel->relayd_id, |
684 | channel->session_id, | |
d2956687 | 685 | channel->trace_chunk, |
ffe60014 DG |
686 | msg.u.stream.cpu, |
687 | &alloc_ret, | |
4891ece8 | 688 | channel->type, |
d2956687 | 689 | channel->monitor); |
3bd1e081 | 690 | if (new_stream == NULL) { |
c80048c6 MD |
691 | switch (alloc_ret) { |
692 | case -ENOMEM: | |
693 | case -EINVAL: | |
694 | default: | |
695 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
696 | break; | |
c80048c6 | 697 | } |
d2956687 | 698 | pthread_mutex_unlock(&channel->lock); |
c5c7998f | 699 | goto error_add_stream_nosignal; |
3bd1e081 | 700 | } |
d771f832 | 701 | |
ffe60014 | 702 | new_stream->wait_fd = fd; |
0c5b3718 SM |
703 | ret_get_max_subbuf_size = kernctl_get_max_subbuf_size( |
704 | new_stream->wait_fd, &new_stream->max_sb_size); | |
705 | if (ret_get_max_subbuf_size < 0) { | |
d05185fa JG |
706 | pthread_mutex_unlock(&channel->lock); |
707 | ERR("Failed to get kernel maximal subbuffer size"); | |
c5c7998f | 708 | goto error_add_stream_nosignal; |
d05185fa JG |
709 | } |
710 | ||
d9a2e16e JD |
711 | consumer_stream_update_channel_attributes(new_stream, |
712 | channel); | |
00e2e675 | 713 | |
a0c83db9 DG |
714 | /* |
715 | * We've just assigned the channel to the stream so increment the | |
07b86b52 JD |
716 | * refcount right now. We don't need to increment the refcount for |
717 | * streams in no monitor because we handle manually the cleanup of | |
718 | * those. It is very important to make sure there is NO prior | |
719 | * consumer_del_stream() calls or else the refcount will be unbalanced. | |
a0c83db9 | 720 | */ |
07b86b52 JD |
721 | if (channel->monitor) { |
722 | uatomic_inc(&new_stream->chan->refcount); | |
723 | } | |
9d9353f9 | 724 | |
fb3a43a9 DG |
725 | /* |
726 | * The buffer flush is done on the session daemon side for the kernel | |
727 | * so no need for the stream "hangup_flush_done" variable to be | |
728 | * tracked. This is important for a kernel stream since we don't rely | |
729 | * on the flush state of the stream to read data. It's not the case for | |
730 | * user space tracing. | |
731 | */ | |
732 | new_stream->hangup_flush_done = 0; | |
733 | ||
9ce5646a MD |
734 | health_code_update(); |
735 | ||
d2956687 | 736 | pthread_mutex_lock(&new_stream->lock); |
633d0084 | 737 | if (ctx->on_recv_stream) { |
0c5b3718 SM |
738 | int ret_recv_stream = ctx->on_recv_stream(new_stream); |
739 | if (ret_recv_stream < 0) { | |
d2956687 JG |
740 | pthread_mutex_unlock(&new_stream->lock); |
741 | pthread_mutex_unlock(&channel->lock); | |
d771f832 | 742 | consumer_stream_free(new_stream); |
c5c7998f | 743 | goto error_add_stream_nosignal; |
fb3a43a9 | 744 | } |
633d0084 | 745 | } |
9ce5646a MD |
746 | health_code_update(); |
747 | ||
07b86b52 JD |
748 | if (new_stream->metadata_flag) { |
749 | channel->metadata_stream = new_stream; | |
750 | } | |
751 | ||
2bba9e53 DG |
752 | /* Do not monitor this stream. */ |
753 | if (!channel->monitor) { | |
5eecee74 | 754 | DBG("Kernel consumer add stream %s in no monitor mode with " |
6dc3064a | 755 | "relayd id %" PRIu64, new_stream->name, |
5eecee74 | 756 | new_stream->net_seq_idx); |
10a50311 | 757 | cds_list_add(&new_stream->send_node, &channel->streams.head); |
d2956687 JG |
758 | pthread_mutex_unlock(&new_stream->lock); |
759 | pthread_mutex_unlock(&channel->lock); | |
c5c7998f | 760 | goto end_add_stream; |
6dc3064a DG |
761 | } |
762 | ||
e1b71bdc DG |
763 | /* Send stream to relayd if the stream has an ID. */ |
764 | if (new_stream->net_seq_idx != (uint64_t) -1ULL) { | |
0c5b3718 SM |
765 | int ret_send_relayd_stream; |
766 | ||
767 | ret_send_relayd_stream = consumer_send_relayd_stream( | |
768 | new_stream, new_stream->chan->pathname); | |
769 | if (ret_send_relayd_stream < 0) { | |
d2956687 JG |
770 | pthread_mutex_unlock(&new_stream->lock); |
771 | pthread_mutex_unlock(&channel->lock); | |
e1b71bdc | 772 | consumer_stream_free(new_stream); |
c5c7998f | 773 | goto error_add_stream_nosignal; |
e1b71bdc | 774 | } |
001b7e62 MD |
775 | |
776 | /* | |
777 | * If adding an extra stream to an already | |
778 | * existing channel (e.g. cpu hotplug), we need | |
779 | * to send the "streams_sent" command to relayd. | |
780 | */ | |
781 | if (channel->streams_sent_to_relayd) { | |
0c5b3718 SM |
782 | int ret_send_relayd_streams_sent; |
783 | ||
784 | ret_send_relayd_streams_sent = | |
785 | consumer_send_relayd_streams_sent( | |
786 | new_stream->net_seq_idx); | |
787 | if (ret_send_relayd_streams_sent < 0) { | |
d2956687 JG |
788 | pthread_mutex_unlock(&new_stream->lock); |
789 | pthread_mutex_unlock(&channel->lock); | |
c5c7998f | 790 | goto error_add_stream_nosignal; |
001b7e62 MD |
791 | } |
792 | } | |
e2039c7a | 793 | } |
d2956687 JG |
794 | pthread_mutex_unlock(&new_stream->lock); |
795 | pthread_mutex_unlock(&channel->lock); | |
e2039c7a | 796 | |
50f8ae69 | 797 | /* Get the right pipe where the stream will be sent. */ |
633d0084 | 798 | if (new_stream->metadata_flag) { |
66d583dc | 799 | consumer_add_metadata_stream(new_stream); |
dae10966 | 800 | stream_pipe = ctx->consumer_metadata_pipe; |
3bd1e081 | 801 | } else { |
66d583dc | 802 | consumer_add_data_stream(new_stream); |
dae10966 | 803 | stream_pipe = ctx->consumer_data_pipe; |
50f8ae69 DG |
804 | } |
805 | ||
66d583dc | 806 | /* Visible to other threads */ |
5ab66908 MD |
807 | new_stream->globally_visible = 1; |
808 | ||
9ce5646a MD |
809 | health_code_update(); |
810 | ||
0c5b3718 SM |
811 | ret_pipe_write = lttng_pipe_write( |
812 | stream_pipe, &new_stream, sizeof(new_stream)); | |
813 | if (ret_pipe_write < 0) { | |
dae10966 | 814 | ERR("Consumer write %s stream to pipe %d", |
50f8ae69 | 815 | new_stream->metadata_flag ? "metadata" : "data", |
dae10966 | 816 | lttng_pipe_get_writefd(stream_pipe)); |
5ab66908 MD |
817 | if (new_stream->metadata_flag) { |
818 | consumer_del_stream_for_metadata(new_stream); | |
819 | } else { | |
820 | consumer_del_stream_for_data(new_stream); | |
821 | } | |
c5c7998f | 822 | goto error_add_stream_nosignal; |
3bd1e081 | 823 | } |
00e2e675 | 824 | |
02d02e31 JD |
825 | DBG("Kernel consumer ADD_STREAM %s (fd: %d) %s with relayd id %" PRIu64, |
826 | new_stream->name, fd, new_stream->chan->pathname, new_stream->relayd_stream_id); | |
c5c7998f | 827 | end_add_stream: |
3bd1e081 | 828 | break; |
c5c7998f JG |
829 | error_add_stream_nosignal: |
830 | goto end_nosignal; | |
831 | error_add_stream_fatal: | |
832 | goto error_fatal; | |
3bd1e081 | 833 | } |
a4baae1b JD |
834 | case LTTNG_CONSUMER_STREAMS_SENT: |
835 | { | |
836 | struct lttng_consumer_channel *channel; | |
0c5b3718 | 837 | int ret_send_status; |
a4baae1b JD |
838 | |
839 | /* | |
840 | * Get stream's channel reference. Needed when adding the stream to the | |
841 | * global hash table. | |
842 | */ | |
843 | channel = consumer_find_channel(msg.u.sent_streams.channel_key); | |
844 | if (!channel) { | |
845 | /* | |
846 | * We could not find the channel. Can happen if cpu hotplug | |
847 | * happens while tearing down. | |
848 | */ | |
849 | ERR("Unable to find channel key %" PRIu64, | |
850 | msg.u.sent_streams.channel_key); | |
e462382a | 851 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
a4baae1b JD |
852 | } |
853 | ||
854 | health_code_update(); | |
855 | ||
856 | /* | |
857 | * Send status code to session daemon. | |
858 | */ | |
0c5b3718 SM |
859 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
860 | if (ret_send_status < 0 || | |
861 | ret_code != LTTCOMM_CONSUMERD_SUCCESS) { | |
a4baae1b | 862 | /* Somehow, the session daemon is not responding anymore. */ |
80d5a658 | 863 | goto error_streams_sent_nosignal; |
a4baae1b JD |
864 | } |
865 | ||
866 | health_code_update(); | |
867 | ||
868 | /* | |
869 | * We should not send this message if we don't monitor the | |
870 | * streams in this channel. | |
871 | */ | |
872 | if (!channel->monitor) { | |
80d5a658 | 873 | goto end_error_streams_sent; |
a4baae1b JD |
874 | } |
875 | ||
876 | health_code_update(); | |
877 | /* Send stream to relayd if the stream has an ID. */ | |
878 | if (msg.u.sent_streams.net_seq_idx != (uint64_t) -1ULL) { | |
0c5b3718 SM |
879 | int ret_send_relay_streams; |
880 | ||
881 | ret_send_relay_streams = consumer_send_relayd_streams_sent( | |
a4baae1b | 882 | msg.u.sent_streams.net_seq_idx); |
0c5b3718 | 883 | if (ret_send_relay_streams < 0) { |
80d5a658 | 884 | goto error_streams_sent_nosignal; |
a4baae1b | 885 | } |
001b7e62 | 886 | channel->streams_sent_to_relayd = true; |
a4baae1b | 887 | } |
80d5a658 | 888 | end_error_streams_sent: |
a4baae1b | 889 | break; |
80d5a658 JG |
890 | error_streams_sent_nosignal: |
891 | goto end_nosignal; | |
a4baae1b | 892 | } |
3bd1e081 MD |
893 | case LTTNG_CONSUMER_UPDATE_STREAM: |
894 | { | |
3f8e211f DG |
895 | rcu_read_unlock(); |
896 | return -ENOSYS; | |
897 | } | |
898 | case LTTNG_CONSUMER_DESTROY_RELAYD: | |
899 | { | |
a6ba4fe1 | 900 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
3f8e211f | 901 | struct consumer_relayd_sock_pair *relayd; |
0c5b3718 | 902 | int ret_send_status; |
3f8e211f | 903 | |
a6ba4fe1 | 904 | DBG("Kernel consumer destroying relayd %" PRIu64, index); |
3f8e211f DG |
905 | |
906 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 907 | relayd = consumer_find_relayd(index); |
3f8e211f | 908 | if (relayd == NULL) { |
3448e266 | 909 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 910 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
3bd1e081 | 911 | } |
3f8e211f | 912 | |
a6ba4fe1 DG |
913 | /* |
914 | * Each relayd socket pair has a refcount of stream attached to it | |
915 | * which tells if the relayd is still active or not depending on the | |
916 | * refcount value. | |
917 | * | |
918 | * This will set the destroy flag of the relayd object and destroy it | |
919 | * if the refcount reaches zero when called. | |
920 | * | |
921 | * The destroy can happen either here or when a stream fd hangs up. | |
922 | */ | |
f50f23d9 DG |
923 | if (relayd) { |
924 | consumer_flag_relayd_for_destroy(relayd); | |
925 | } | |
926 | ||
9ce5646a MD |
927 | health_code_update(); |
928 | ||
0c5b3718 SM |
929 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
930 | if (ret_send_status < 0) { | |
f50f23d9 | 931 | /* Somehow, the session daemon is not responding anymore. */ |
1803a064 | 932 | goto error_fatal; |
f50f23d9 | 933 | } |
3f8e211f | 934 | |
3f8e211f | 935 | goto end_nosignal; |
3bd1e081 | 936 | } |
6d805429 | 937 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 938 | { |
0c5b3718 | 939 | int32_t ret_data_pending; |
6d805429 | 940 | uint64_t id = msg.u.data_pending.session_id; |
0c5b3718 | 941 | ssize_t ret_send; |
c8f59ee5 | 942 | |
6d805429 | 943 | DBG("Kernel consumer data pending command for id %" PRIu64, id); |
c8f59ee5 | 944 | |
0c5b3718 | 945 | ret_data_pending = consumer_data_pending(id); |
c8f59ee5 | 946 | |
9ce5646a MD |
947 | health_code_update(); |
948 | ||
c8f59ee5 | 949 | /* Send back returned value to session daemon */ |
0c5b3718 SM |
950 | ret_send = lttcomm_send_unix_sock(sock, &ret_data_pending, |
951 | sizeof(ret_data_pending)); | |
952 | if (ret_send < 0) { | |
6d805429 | 953 | PERROR("send data pending ret code"); |
1803a064 | 954 | goto error_fatal; |
c8f59ee5 | 955 | } |
f50f23d9 DG |
956 | |
957 | /* | |
958 | * No need to send back a status message since the data pending | |
959 | * returned value is the response. | |
960 | */ | |
c8f59ee5 | 961 | break; |
53632229 | 962 | } |
6dc3064a DG |
963 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
964 | { | |
3eb928aa MD |
965 | struct lttng_consumer_channel *channel; |
966 | uint64_t key = msg.u.snapshot_channel.key; | |
0c5b3718 | 967 | int ret_send_status; |
3eb928aa MD |
968 | |
969 | channel = consumer_find_channel(key); | |
970 | if (!channel) { | |
971 | ERR("Channel %" PRIu64 " not found", key); | |
972 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
07b86b52 | 973 | } else { |
3eb928aa | 974 | if (msg.u.snapshot_channel.metadata == 1) { |
0c5b3718 SM |
975 | int ret_snapshot; |
976 | ||
977 | ret_snapshot = lttng_kconsumer_snapshot_metadata( | |
978 | channel, key, | |
3eb928aa | 979 | msg.u.snapshot_channel.pathname, |
0c5b3718 SM |
980 | msg.u.snapshot_channel.relayd_id, |
981 | ctx); | |
982 | if (ret_snapshot < 0) { | |
3eb928aa MD |
983 | ERR("Snapshot metadata failed"); |
984 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
985 | } | |
986 | } else { | |
0c5b3718 SM |
987 | int ret_snapshot; |
988 | ||
989 | ret_snapshot = lttng_kconsumer_snapshot_channel( | |
990 | channel, key, | |
3eb928aa MD |
991 | msg.u.snapshot_channel.pathname, |
992 | msg.u.snapshot_channel.relayd_id, | |
0c5b3718 SM |
993 | msg.u.snapshot_channel |
994 | .nb_packets_per_stream, | |
3eb928aa | 995 | ctx); |
0c5b3718 | 996 | if (ret_snapshot < 0) { |
3eb928aa MD |
997 | ERR("Snapshot channel failed"); |
998 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
999 | } | |
07b86b52 JD |
1000 | } |
1001 | } | |
9ce5646a MD |
1002 | health_code_update(); |
1003 | ||
0c5b3718 SM |
1004 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
1005 | if (ret_send_status < 0) { | |
6dc3064a DG |
1006 | /* Somehow, the session daemon is not responding anymore. */ |
1007 | goto end_nosignal; | |
1008 | } | |
1009 | break; | |
1010 | } | |
07b86b52 JD |
1011 | case LTTNG_CONSUMER_DESTROY_CHANNEL: |
1012 | { | |
1013 | uint64_t key = msg.u.destroy_channel.key; | |
1014 | struct lttng_consumer_channel *channel; | |
0c5b3718 | 1015 | int ret_send_status; |
07b86b52 JD |
1016 | |
1017 | channel = consumer_find_channel(key); | |
1018 | if (!channel) { | |
1019 | ERR("Kernel consumer destroy channel %" PRIu64 " not found", key); | |
e462382a | 1020 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
07b86b52 JD |
1021 | } |
1022 | ||
9ce5646a MD |
1023 | health_code_update(); |
1024 | ||
0c5b3718 SM |
1025 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
1026 | if (ret_send_status < 0) { | |
07b86b52 | 1027 | /* Somehow, the session daemon is not responding anymore. */ |
a9d36096 | 1028 | goto end_destroy_channel; |
07b86b52 JD |
1029 | } |
1030 | ||
9ce5646a MD |
1031 | health_code_update(); |
1032 | ||
15dc512a DG |
1033 | /* Stop right now if no channel was found. */ |
1034 | if (!channel) { | |
a9d36096 | 1035 | goto end_destroy_channel; |
15dc512a DG |
1036 | } |
1037 | ||
07b86b52 JD |
1038 | /* |
1039 | * This command should ONLY be issued for channel with streams set in | |
1040 | * no monitor mode. | |
1041 | */ | |
1042 | assert(!channel->monitor); | |
1043 | ||
1044 | /* | |
1045 | * The refcount should ALWAYS be 0 in the case of a channel in no | |
1046 | * monitor mode. | |
1047 | */ | |
1048 | assert(!uatomic_sub_return(&channel->refcount, 1)); | |
1049 | ||
1050 | consumer_del_channel(channel); | |
a9d36096 | 1051 | end_destroy_channel: |
07b86b52 JD |
1052 | goto end_nosignal; |
1053 | } | |
fb83fe64 JD |
1054 | case LTTNG_CONSUMER_DISCARDED_EVENTS: |
1055 | { | |
66ab32be JD |
1056 | ssize_t ret; |
1057 | uint64_t count; | |
fb83fe64 JD |
1058 | struct lttng_consumer_channel *channel; |
1059 | uint64_t id = msg.u.discarded_events.session_id; | |
1060 | uint64_t key = msg.u.discarded_events.channel_key; | |
1061 | ||
e5742757 MD |
1062 | DBG("Kernel consumer discarded events command for session id %" |
1063 | PRIu64 ", channel key %" PRIu64, id, key); | |
1064 | ||
fb83fe64 JD |
1065 | channel = consumer_find_channel(key); |
1066 | if (!channel) { | |
1067 | ERR("Kernel consumer discarded events channel %" | |
1068 | PRIu64 " not found", key); | |
66ab32be | 1069 | count = 0; |
e5742757 | 1070 | } else { |
66ab32be | 1071 | count = channel->discarded_events; |
fb83fe64 JD |
1072 | } |
1073 | ||
fb83fe64 JD |
1074 | health_code_update(); |
1075 | ||
1076 | /* Send back returned value to session daemon */ | |
66ab32be | 1077 | ret = lttcomm_send_unix_sock(sock, &count, sizeof(count)); |
fb83fe64 JD |
1078 | if (ret < 0) { |
1079 | PERROR("send discarded events"); | |
1080 | goto error_fatal; | |
1081 | } | |
1082 | ||
1083 | break; | |
1084 | } | |
1085 | case LTTNG_CONSUMER_LOST_PACKETS: | |
1086 | { | |
66ab32be JD |
1087 | ssize_t ret; |
1088 | uint64_t count; | |
fb83fe64 JD |
1089 | struct lttng_consumer_channel *channel; |
1090 | uint64_t id = msg.u.lost_packets.session_id; | |
1091 | uint64_t key = msg.u.lost_packets.channel_key; | |
1092 | ||
e5742757 MD |
1093 | DBG("Kernel consumer lost packets command for session id %" |
1094 | PRIu64 ", channel key %" PRIu64, id, key); | |
1095 | ||
fb83fe64 JD |
1096 | channel = consumer_find_channel(key); |
1097 | if (!channel) { | |
1098 | ERR("Kernel consumer lost packets channel %" | |
1099 | PRIu64 " not found", key); | |
66ab32be | 1100 | count = 0; |
e5742757 | 1101 | } else { |
66ab32be | 1102 | count = channel->lost_packets; |
fb83fe64 JD |
1103 | } |
1104 | ||
fb83fe64 JD |
1105 | health_code_update(); |
1106 | ||
1107 | /* Send back returned value to session daemon */ | |
66ab32be | 1108 | ret = lttcomm_send_unix_sock(sock, &count, sizeof(count)); |
fb83fe64 JD |
1109 | if (ret < 0) { |
1110 | PERROR("send lost packets"); | |
1111 | goto error_fatal; | |
1112 | } | |
1113 | ||
1114 | break; | |
1115 | } | |
b3530820 JG |
1116 | case LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE: |
1117 | { | |
1118 | int channel_monitor_pipe; | |
0c5b3718 SM |
1119 | int ret_send_status, ret_set_channel_monitor_pipe; |
1120 | ssize_t ret_recv; | |
b3530820 JG |
1121 | |
1122 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1123 | /* Successfully received the command's type. */ | |
0c5b3718 SM |
1124 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
1125 | if (ret_send_status < 0) { | |
b3530820 JG |
1126 | goto error_fatal; |
1127 | } | |
1128 | ||
0c5b3718 SM |
1129 | ret_recv = lttcomm_recv_fds_unix_sock( |
1130 | sock, &channel_monitor_pipe, 1); | |
1131 | if (ret_recv != sizeof(channel_monitor_pipe)) { | |
b3530820 JG |
1132 | ERR("Failed to receive channel monitor pipe"); |
1133 | goto error_fatal; | |
1134 | } | |
1135 | ||
1136 | DBG("Received channel monitor pipe (%d)", channel_monitor_pipe); | |
0c5b3718 SM |
1137 | ret_set_channel_monitor_pipe = |
1138 | consumer_timer_thread_set_channel_monitor_pipe( | |
1139 | channel_monitor_pipe); | |
1140 | if (!ret_set_channel_monitor_pipe) { | |
b3530820 | 1141 | int flags; |
0c5b3718 | 1142 | int ret_fcntl; |
b3530820 JG |
1143 | |
1144 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1145 | /* Set the pipe as non-blocking. */ | |
0c5b3718 SM |
1146 | ret_fcntl = fcntl(channel_monitor_pipe, F_GETFL, 0); |
1147 | if (ret_fcntl == -1) { | |
b3530820 JG |
1148 | PERROR("fcntl get flags of the channel monitoring pipe"); |
1149 | goto error_fatal; | |
1150 | } | |
0c5b3718 | 1151 | flags = ret_fcntl; |
b3530820 | 1152 | |
0c5b3718 | 1153 | ret_fcntl = fcntl(channel_monitor_pipe, F_SETFL, |
b3530820 | 1154 | flags | O_NONBLOCK); |
0c5b3718 | 1155 | if (ret_fcntl == -1) { |
b3530820 JG |
1156 | PERROR("fcntl set O_NONBLOCK flag of the channel monitoring pipe"); |
1157 | goto error_fatal; | |
1158 | } | |
1159 | DBG("Channel monitor pipe set as non-blocking"); | |
1160 | } else { | |
1161 | ret_code = LTTCOMM_CONSUMERD_ALREADY_SET; | |
1162 | } | |
0c5b3718 SM |
1163 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
1164 | if (ret_send_status < 0) { | |
b3530820 JG |
1165 | goto error_fatal; |
1166 | } | |
1167 | break; | |
1168 | } | |
b99a8d42 JD |
1169 | case LTTNG_CONSUMER_ROTATE_CHANNEL: |
1170 | { | |
92b7a7f8 MD |
1171 | struct lttng_consumer_channel *channel; |
1172 | uint64_t key = msg.u.rotate_channel.key; | |
0c5b3718 | 1173 | int ret_send_status; |
b99a8d42 | 1174 | |
92b7a7f8 | 1175 | DBG("Consumer rotate channel %" PRIu64, key); |
b99a8d42 | 1176 | |
92b7a7f8 MD |
1177 | channel = consumer_find_channel(key); |
1178 | if (!channel) { | |
1179 | ERR("Channel %" PRIu64 " not found", key); | |
1180 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
1181 | } else { | |
1182 | /* | |
1183 | * Sample the rotate position of all the streams in this channel. | |
1184 | */ | |
0c5b3718 SM |
1185 | int ret_rotate_channel; |
1186 | ||
1187 | ret_rotate_channel = lttng_consumer_rotate_channel( | |
1188 | channel, key, | |
92b7a7f8 | 1189 | msg.u.rotate_channel.relayd_id, |
0c5b3718 SM |
1190 | msg.u.rotate_channel.metadata, ctx); |
1191 | if (ret_rotate_channel < 0) { | |
92b7a7f8 MD |
1192 | ERR("Rotate channel failed"); |
1193 | ret_code = LTTCOMM_CONSUMERD_ROTATION_FAIL; | |
1194 | } | |
b99a8d42 | 1195 | |
92b7a7f8 MD |
1196 | health_code_update(); |
1197 | } | |
0c5b3718 SM |
1198 | |
1199 | ret_send_status = consumer_send_status_msg(sock, ret_code); | |
1200 | if (ret_send_status < 0) { | |
b99a8d42 | 1201 | /* Somehow, the session daemon is not responding anymore. */ |
713bdd26 | 1202 | goto error_rotate_channel; |
b99a8d42 | 1203 | } |
92b7a7f8 MD |
1204 | if (channel) { |
1205 | /* Rotate the streams that are ready right now. */ | |
0c5b3718 SM |
1206 | int ret_rotate; |
1207 | ||
1208 | ret_rotate = lttng_consumer_rotate_ready_streams( | |
92b7a7f8 | 1209 | channel, key, ctx); |
0c5b3718 | 1210 | if (ret_rotate < 0) { |
92b7a7f8 MD |
1211 | ERR("Rotate ready streams failed"); |
1212 | } | |
b99a8d42 | 1213 | } |
b99a8d42 | 1214 | break; |
713bdd26 JG |
1215 | error_rotate_channel: |
1216 | goto end_nosignal; | |
b99a8d42 | 1217 | } |
5f3aff8b MD |
1218 | case LTTNG_CONSUMER_CLEAR_CHANNEL: |
1219 | { | |
1220 | struct lttng_consumer_channel *channel; | |
1221 | uint64_t key = msg.u.clear_channel.key; | |
0c5b3718 | 1222 | int ret_send_status; |
5f3aff8b MD |
1223 | |
1224 | channel = consumer_find_channel(key); | |
1225 | if (!channel) { | |
1226 | DBG("Channel %" PRIu64 " not found", key); | |
1227 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
1228 | } else { | |
0c5b3718 SM |
1229 | int ret_clear_channel; |
1230 | ||
1231 | ret_clear_channel = | |
1232 | lttng_consumer_clear_channel(channel); | |
1233 | if (ret_clear_channel) { | |
5f3aff8b | 1234 | ERR("Clear channel failed"); |
0c5b3718 | 1235 | ret_code = ret_clear_channel; |
5f3aff8b MD |
1236 | } |
1237 | ||
1238 | health_code_update(); | |
1239 | } | |
0c5b3718 SM |
1240 | |
1241 | ret_send_status = consumer_send_status_msg(sock, ret_code); | |
1242 | if (ret_send_status < 0) { | |
5f3aff8b MD |
1243 | /* Somehow, the session daemon is not responding anymore. */ |
1244 | goto end_nosignal; | |
1245 | } | |
1246 | ||
1247 | break; | |
1248 | } | |
d2956687 | 1249 | case LTTNG_CONSUMER_INIT: |
00fb02ac | 1250 | { |
0c5b3718 SM |
1251 | int ret_send_status; |
1252 | ||
d2956687 JG |
1253 | ret_code = lttng_consumer_init_command(ctx, |
1254 | msg.u.init.sessiond_uuid); | |
00fb02ac | 1255 | health_code_update(); |
0c5b3718 SM |
1256 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
1257 | if (ret_send_status < 0) { | |
00fb02ac JD |
1258 | /* Somehow, the session daemon is not responding anymore. */ |
1259 | goto end_nosignal; | |
1260 | } | |
1261 | break; | |
1262 | } | |
d2956687 | 1263 | case LTTNG_CONSUMER_CREATE_TRACE_CHUNK: |
d88744a4 | 1264 | { |
d2956687 | 1265 | const struct lttng_credentials credentials = { |
ff588497 JR |
1266 | .uid = LTTNG_OPTIONAL_INIT_VALUE(msg.u.create_trace_chunk.credentials.value.uid), |
1267 | .gid = LTTNG_OPTIONAL_INIT_VALUE(msg.u.create_trace_chunk.credentials.value.gid), | |
d2956687 JG |
1268 | }; |
1269 | const bool is_local_trace = | |
1270 | !msg.u.create_trace_chunk.relayd_id.is_set; | |
1271 | const uint64_t relayd_id = | |
1272 | msg.u.create_trace_chunk.relayd_id.value; | |
1273 | const char *chunk_override_name = | |
1274 | *msg.u.create_trace_chunk.override_name ? | |
1275 | msg.u.create_trace_chunk.override_name : | |
1276 | NULL; | |
cbf53d23 | 1277 | struct lttng_directory_handle *chunk_directory_handle = NULL; |
d88744a4 | 1278 | |
d2956687 JG |
1279 | /* |
1280 | * The session daemon will only provide a chunk directory file | |
1281 | * descriptor for local traces. | |
1282 | */ | |
1283 | if (is_local_trace) { | |
1284 | int chunk_dirfd; | |
0c5b3718 SM |
1285 | int ret_send_status; |
1286 | ssize_t ret_recv; | |
19990ed5 | 1287 | |
d2956687 | 1288 | /* Acnowledge the reception of the command. */ |
0c5b3718 SM |
1289 | ret_send_status = consumer_send_status_msg( |
1290 | sock, LTTCOMM_CONSUMERD_SUCCESS); | |
1291 | if (ret_send_status < 0) { | |
d2956687 JG |
1292 | /* Somehow, the session daemon is not responding anymore. */ |
1293 | goto end_nosignal; | |
1294 | } | |
92816cc3 | 1295 | |
0c5b3718 SM |
1296 | ret_recv = lttcomm_recv_fds_unix_sock( |
1297 | sock, &chunk_dirfd, 1); | |
1298 | if (ret_recv != sizeof(chunk_dirfd)) { | |
d2956687 JG |
1299 | ERR("Failed to receive trace chunk directory file descriptor"); |
1300 | goto error_fatal; | |
1301 | } | |
92816cc3 | 1302 | |
d2956687 JG |
1303 | DBG("Received trace chunk directory fd (%d)", |
1304 | chunk_dirfd); | |
cbf53d23 | 1305 | chunk_directory_handle = lttng_directory_handle_create_from_dirfd( |
d2956687 | 1306 | chunk_dirfd); |
cbf53d23 | 1307 | if (!chunk_directory_handle) { |
d2956687 JG |
1308 | ERR("Failed to initialize chunk directory handle from directory file descriptor"); |
1309 | if (close(chunk_dirfd)) { | |
1310 | PERROR("Failed to close chunk directory file descriptor"); | |
1311 | } | |
1312 | goto error_fatal; | |
1313 | } | |
92816cc3 JG |
1314 | } |
1315 | ||
d2956687 JG |
1316 | ret_code = lttng_consumer_create_trace_chunk( |
1317 | !is_local_trace ? &relayd_id : NULL, | |
1318 | msg.u.create_trace_chunk.session_id, | |
1319 | msg.u.create_trace_chunk.chunk_id, | |
e5add6d0 JG |
1320 | (time_t) msg.u.create_trace_chunk |
1321 | .creation_timestamp, | |
d2956687 | 1322 | chunk_override_name, |
e5add6d0 JG |
1323 | msg.u.create_trace_chunk.credentials.is_set ? |
1324 | &credentials : | |
1325 | NULL, | |
cbf53d23 JG |
1326 | chunk_directory_handle); |
1327 | lttng_directory_handle_put(chunk_directory_handle); | |
d2956687 | 1328 | goto end_msg_sessiond; |
d88744a4 | 1329 | } |
d2956687 | 1330 | case LTTNG_CONSUMER_CLOSE_TRACE_CHUNK: |
a1ae2ea5 | 1331 | { |
bbc4768c JG |
1332 | enum lttng_trace_chunk_command_type close_command = |
1333 | msg.u.close_trace_chunk.close_command.value; | |
d2956687 JG |
1334 | const uint64_t relayd_id = |
1335 | msg.u.close_trace_chunk.relayd_id.value; | |
ecd1a12f MD |
1336 | struct lttcomm_consumer_close_trace_chunk_reply reply; |
1337 | char path[LTTNG_PATH_MAX]; | |
0c5b3718 | 1338 | ssize_t ret_send; |
d2956687 JG |
1339 | |
1340 | ret_code = lttng_consumer_close_trace_chunk( | |
1341 | msg.u.close_trace_chunk.relayd_id.is_set ? | |
bbc4768c JG |
1342 | &relayd_id : |
1343 | NULL, | |
d2956687 JG |
1344 | msg.u.close_trace_chunk.session_id, |
1345 | msg.u.close_trace_chunk.chunk_id, | |
bbc4768c JG |
1346 | (time_t) msg.u.close_trace_chunk.close_timestamp, |
1347 | msg.u.close_trace_chunk.close_command.is_set ? | |
1348 | &close_command : | |
ecd1a12f MD |
1349 | NULL, path); |
1350 | reply.ret_code = ret_code; | |
1351 | reply.path_length = strlen(path) + 1; | |
0c5b3718 SM |
1352 | ret_send = lttcomm_send_unix_sock(sock, &reply, sizeof(reply)); |
1353 | if (ret_send != sizeof(reply)) { | |
ecd1a12f MD |
1354 | goto error_fatal; |
1355 | } | |
0c5b3718 SM |
1356 | ret_send = lttcomm_send_unix_sock( |
1357 | sock, path, reply.path_length); | |
1358 | if (ret_send != reply.path_length) { | |
ecd1a12f MD |
1359 | goto error_fatal; |
1360 | } | |
1361 | goto end_nosignal; | |
3654ed19 | 1362 | } |
d2956687 | 1363 | case LTTNG_CONSUMER_TRACE_CHUNK_EXISTS: |
3654ed19 | 1364 | { |
d2956687 JG |
1365 | const uint64_t relayd_id = |
1366 | msg.u.trace_chunk_exists.relayd_id.value; | |
1367 | ||
1368 | ret_code = lttng_consumer_trace_chunk_exists( | |
1369 | msg.u.trace_chunk_exists.relayd_id.is_set ? | |
1370 | &relayd_id : NULL, | |
1371 | msg.u.trace_chunk_exists.session_id, | |
1372 | msg.u.trace_chunk_exists.chunk_id); | |
1373 | goto end_msg_sessiond; | |
a1ae2ea5 | 1374 | } |
04ed9e10 JG |
1375 | case LTTNG_CONSUMER_OPEN_CHANNEL_PACKETS: |
1376 | { | |
1377 | const uint64_t key = msg.u.open_channel_packets.key; | |
1378 | struct lttng_consumer_channel *channel = | |
1379 | consumer_find_channel(key); | |
1380 | ||
1381 | if (channel) { | |
1382 | pthread_mutex_lock(&channel->lock); | |
1383 | ret_code = lttng_consumer_open_channel_packets(channel); | |
1384 | pthread_mutex_unlock(&channel->lock); | |
1385 | } else { | |
1386 | WARN("Channel %" PRIu64 " not found", key); | |
1387 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
1388 | } | |
1389 | ||
1390 | health_code_update(); | |
1391 | goto end_msg_sessiond; | |
1392 | } | |
3bd1e081 | 1393 | default: |
3f8e211f | 1394 | goto end_nosignal; |
3bd1e081 | 1395 | } |
3f8e211f | 1396 | |
3bd1e081 | 1397 | end_nosignal: |
4cbc1a04 DG |
1398 | /* |
1399 | * Return 1 to indicate success since the 0 value can be a socket | |
1400 | * shutdown during the recv() or send() call. | |
1401 | */ | |
0c5b3718 | 1402 | ret_func = 1; |
c5c7998f JG |
1403 | goto end; |
1404 | error_fatal: | |
1405 | /* This will issue a consumer stop. */ | |
0c5b3718 | 1406 | ret_func = -1; |
c5c7998f | 1407 | goto end; |
d2956687 JG |
1408 | end_msg_sessiond: |
1409 | /* | |
1410 | * The returned value here is not useful since either way we'll return 1 to | |
1411 | * the caller because the session daemon socket management is done | |
1412 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. | |
1413 | */ | |
0c5b3718 SM |
1414 | { |
1415 | int ret_send_status; | |
1416 | ||
1417 | ret_send_status = consumer_send_status_msg(sock, ret_code); | |
1418 | if (ret_send_status < 0) { | |
1419 | goto error_fatal; | |
1420 | } | |
d2956687 | 1421 | } |
0c5b3718 SM |
1422 | |
1423 | ret_func = 1; | |
1424 | ||
c5c7998f | 1425 | end: |
d2956687 | 1426 | health_code_update(); |
1803a064 | 1427 | rcu_read_unlock(); |
0c5b3718 | 1428 | return ret_func; |
3bd1e081 | 1429 | } |
d41f73b7 | 1430 | |
94d49140 JD |
1431 | /* |
1432 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
1433 | * metadata thread can consumer them. | |
1434 | * | |
1435 | * Metadata stream lock MUST be acquired. | |
94d49140 | 1436 | */ |
577eea73 JG |
1437 | enum sync_metadata_status lttng_kconsumer_sync_metadata( |
1438 | struct lttng_consumer_stream *metadata) | |
94d49140 JD |
1439 | { |
1440 | int ret; | |
577eea73 | 1441 | enum sync_metadata_status status; |
94d49140 JD |
1442 | |
1443 | assert(metadata); | |
1444 | ||
1445 | ret = kernctl_buffer_flush(metadata->wait_fd); | |
1446 | if (ret < 0) { | |
1447 | ERR("Failed to flush kernel stream"); | |
577eea73 | 1448 | status = SYNC_METADATA_STATUS_ERROR; |
94d49140 JD |
1449 | goto end; |
1450 | } | |
1451 | ||
1452 | ret = kernctl_snapshot(metadata->wait_fd); | |
1453 | if (ret < 0) { | |
577eea73 JG |
1454 | if (errno == EAGAIN) { |
1455 | /* No new metadata, exit. */ | |
1456 | DBG("Sync metadata, no new kernel metadata"); | |
1457 | status = SYNC_METADATA_STATUS_NO_DATA; | |
1458 | } else { | |
94d49140 | 1459 | ERR("Sync metadata, taking kernel snapshot failed."); |
577eea73 | 1460 | status = SYNC_METADATA_STATUS_ERROR; |
94d49140 | 1461 | } |
577eea73 JG |
1462 | } else { |
1463 | status = SYNC_METADATA_STATUS_NEW_DATA; | |
94d49140 JD |
1464 | } |
1465 | ||
1466 | end: | |
577eea73 | 1467 | return status; |
94d49140 | 1468 | } |
309167d2 | 1469 | |
fb83fe64 | 1470 | static |
6f9449c2 JG |
1471 | int extract_common_subbuffer_info(struct lttng_consumer_stream *stream, |
1472 | struct stream_subbuffer *subbuf) | |
fb83fe64 JD |
1473 | { |
1474 | int ret; | |
fb83fe64 | 1475 | |
6f9449c2 JG |
1476 | ret = kernctl_get_subbuf_size( |
1477 | stream->wait_fd, &subbuf->info.data.subbuf_size); | |
1478 | if (ret) { | |
fb83fe64 JD |
1479 | goto end; |
1480 | } | |
fb83fe64 | 1481 | |
6f9449c2 JG |
1482 | ret = kernctl_get_padded_subbuf_size( |
1483 | stream->wait_fd, &subbuf->info.data.padded_subbuf_size); | |
1484 | if (ret) { | |
fb83fe64 JD |
1485 | goto end; |
1486 | } | |
fb83fe64 JD |
1487 | |
1488 | end: | |
1489 | return ret; | |
1490 | } | |
1491 | ||
93ec662e | 1492 | static |
6f9449c2 JG |
1493 | int extract_metadata_subbuffer_info(struct lttng_consumer_stream *stream, |
1494 | struct stream_subbuffer *subbuf) | |
93ec662e JD |
1495 | { |
1496 | int ret; | |
93ec662e | 1497 | |
6f9449c2 JG |
1498 | ret = extract_common_subbuffer_info(stream, subbuf); |
1499 | if (ret) { | |
93ec662e JD |
1500 | goto end; |
1501 | } | |
1502 | ||
6f9449c2 JG |
1503 | ret = kernctl_get_metadata_version( |
1504 | stream->wait_fd, &subbuf->info.metadata.version); | |
1505 | if (ret) { | |
93ec662e JD |
1506 | goto end; |
1507 | } | |
1508 | ||
93ec662e JD |
1509 | end: |
1510 | return ret; | |
1511 | } | |
1512 | ||
6f9449c2 JG |
1513 | static |
1514 | int extract_data_subbuffer_info(struct lttng_consumer_stream *stream, | |
1515 | struct stream_subbuffer *subbuf) | |
d41f73b7 | 1516 | { |
6f9449c2 | 1517 | int ret; |
d41f73b7 | 1518 | |
6f9449c2 JG |
1519 | ret = extract_common_subbuffer_info(stream, subbuf); |
1520 | if (ret) { | |
1521 | goto end; | |
1522 | } | |
309167d2 | 1523 | |
6f9449c2 JG |
1524 | ret = kernctl_get_packet_size( |
1525 | stream->wait_fd, &subbuf->info.data.packet_size); | |
1526 | if (ret < 0) { | |
1527 | PERROR("Failed to get sub-buffer packet size"); | |
1528 | goto end; | |
1529 | } | |
02d02e31 | 1530 | |
6f9449c2 JG |
1531 | ret = kernctl_get_content_size( |
1532 | stream->wait_fd, &subbuf->info.data.content_size); | |
1533 | if (ret < 0) { | |
1534 | PERROR("Failed to get sub-buffer content size"); | |
1535 | goto end; | |
d41f73b7 MD |
1536 | } |
1537 | ||
6f9449c2 JG |
1538 | ret = kernctl_get_timestamp_begin( |
1539 | stream->wait_fd, &subbuf->info.data.timestamp_begin); | |
1540 | if (ret < 0) { | |
1541 | PERROR("Failed to get sub-buffer begin timestamp"); | |
1542 | goto end; | |
1d4dfdef DG |
1543 | } |
1544 | ||
6f9449c2 JG |
1545 | ret = kernctl_get_timestamp_end( |
1546 | stream->wait_fd, &subbuf->info.data.timestamp_end); | |
1547 | if (ret < 0) { | |
1548 | PERROR("Failed to get sub-buffer end timestamp"); | |
1549 | goto end; | |
1550 | } | |
1551 | ||
1552 | ret = kernctl_get_events_discarded( | |
1553 | stream->wait_fd, &subbuf->info.data.events_discarded); | |
1554 | if (ret) { | |
1555 | PERROR("Failed to get sub-buffer events discarded count"); | |
1556 | goto end; | |
1557 | } | |
1558 | ||
1559 | ret = kernctl_get_sequence_number(stream->wait_fd, | |
1560 | &subbuf->info.data.sequence_number.value); | |
1561 | if (ret) { | |
1562 | /* May not be supported by older LTTng-modules. */ | |
1563 | if (ret != -ENOTTY) { | |
1564 | PERROR("Failed to get sub-buffer sequence number"); | |
1565 | goto end; | |
fb83fe64 | 1566 | } |
1c20f0e2 | 1567 | } else { |
6f9449c2 | 1568 | subbuf->info.data.sequence_number.is_set = true; |
309167d2 JD |
1569 | } |
1570 | ||
6f9449c2 JG |
1571 | ret = kernctl_get_stream_id( |
1572 | stream->wait_fd, &subbuf->info.data.stream_id); | |
1573 | if (ret < 0) { | |
1574 | PERROR("Failed to get stream id"); | |
1575 | goto end; | |
1576 | } | |
1d4dfdef | 1577 | |
6f9449c2 JG |
1578 | ret = kernctl_get_instance_id(stream->wait_fd, |
1579 | &subbuf->info.data.stream_instance_id.value); | |
1580 | if (ret) { | |
1581 | /* May not be supported by older LTTng-modules. */ | |
1582 | if (ret != -ENOTTY) { | |
1583 | PERROR("Failed to get stream instance id"); | |
1584 | goto end; | |
1d4dfdef | 1585 | } |
6f9449c2 JG |
1586 | } else { |
1587 | subbuf->info.data.stream_instance_id.is_set = true; | |
1588 | } | |
1589 | end: | |
1590 | return ret; | |
1591 | } | |
47e81c02 | 1592 | |
6f9449c2 | 1593 | static |
823a3926 JG |
1594 | enum get_next_subbuffer_status get_subbuffer_common( |
1595 | struct lttng_consumer_stream *stream, | |
6f9449c2 JG |
1596 | struct stream_subbuffer *subbuffer) |
1597 | { | |
1598 | int ret; | |
823a3926 | 1599 | enum get_next_subbuffer_status status; |
6f9449c2 JG |
1600 | |
1601 | ret = kernctl_get_next_subbuf(stream->wait_fd); | |
823a3926 JG |
1602 | switch (ret) { |
1603 | case 0: | |
1604 | status = GET_NEXT_SUBBUFFER_STATUS_OK; | |
1605 | break; | |
1606 | case -ENODATA: | |
1607 | case -EAGAIN: | |
684c6783 MD |
1608 | /* |
1609 | * The caller only expects -ENODATA when there is no data to | |
1610 | * read, but the kernel tracer returns -EAGAIN when there is | |
1611 | * currently no data for a non-finalized stream, and -ENODATA | |
1612 | * when there is no data for a finalized stream. Those can be | |
1613 | * combined into a -ENODATA return value. | |
1614 | */ | |
823a3926 JG |
1615 | status = GET_NEXT_SUBBUFFER_STATUS_NO_DATA; |
1616 | goto end; | |
1617 | default: | |
1618 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; | |
6f9449c2 JG |
1619 | goto end; |
1620 | } | |
1621 | ||
1622 | ret = stream->read_subbuffer_ops.extract_subbuffer_info( | |
823a3926 JG |
1623 | stream, subbuffer); |
1624 | if (ret) { | |
1625 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; | |
1626 | } | |
6f9449c2 | 1627 | end: |
823a3926 | 1628 | return status; |
6f9449c2 | 1629 | } |
128708c3 | 1630 | |
6f9449c2 | 1631 | static |
823a3926 JG |
1632 | enum get_next_subbuffer_status get_next_subbuffer_splice( |
1633 | struct lttng_consumer_stream *stream, | |
6f9449c2 JG |
1634 | struct stream_subbuffer *subbuffer) |
1635 | { | |
823a3926 JG |
1636 | const enum get_next_subbuffer_status status = |
1637 | get_subbuffer_common(stream, subbuffer); | |
1d4dfdef | 1638 | |
823a3926 | 1639 | if (status != GET_NEXT_SUBBUFFER_STATUS_OK) { |
6f9449c2 JG |
1640 | goto end; |
1641 | } | |
1d4dfdef | 1642 | |
6f9449c2 JG |
1643 | subbuffer->buffer.fd = stream->wait_fd; |
1644 | end: | |
823a3926 | 1645 | return status; |
6f9449c2 | 1646 | } |
fd424d99 | 1647 | |
6f9449c2 | 1648 | static |
823a3926 JG |
1649 | enum get_next_subbuffer_status get_next_subbuffer_mmap( |
1650 | struct lttng_consumer_stream *stream, | |
6f9449c2 JG |
1651 | struct stream_subbuffer *subbuffer) |
1652 | { | |
1653 | int ret; | |
823a3926 | 1654 | enum get_next_subbuffer_status status; |
6f9449c2 JG |
1655 | const char *addr; |
1656 | ||
823a3926 JG |
1657 | status = get_subbuffer_common(stream, subbuffer); |
1658 | if (status != GET_NEXT_SUBBUFFER_STATUS_OK) { | |
6f9449c2 | 1659 | goto end; |
128708c3 | 1660 | } |
6f9449c2 JG |
1661 | |
1662 | ret = get_current_subbuf_addr(stream, &addr); | |
1663 | if (ret) { | |
823a3926 | 1664 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; |
6f9449c2 | 1665 | goto end; |
d41f73b7 | 1666 | } |
6f9449c2 JG |
1667 | |
1668 | subbuffer->buffer.buffer = lttng_buffer_view_init( | |
1669 | addr, 0, subbuffer->info.data.padded_subbuf_size); | |
1670 | end: | |
823a3926 | 1671 | return status; |
6f9449c2 JG |
1672 | } |
1673 | ||
f5ba75b4 | 1674 | static |
823a3926 | 1675 | enum get_next_subbuffer_status get_next_subbuffer_metadata_check(struct lttng_consumer_stream *stream, |
f5ba75b4 JG |
1676 | struct stream_subbuffer *subbuffer) |
1677 | { | |
1678 | int ret; | |
1679 | const char *addr; | |
1680 | bool coherent; | |
823a3926 | 1681 | enum get_next_subbuffer_status status; |
f5ba75b4 JG |
1682 | |
1683 | ret = kernctl_get_next_subbuf_metadata_check(stream->wait_fd, | |
1684 | &coherent); | |
1685 | if (ret) { | |
1686 | goto end; | |
1687 | } | |
1688 | ||
1689 | ret = stream->read_subbuffer_ops.extract_subbuffer_info( | |
1690 | stream, subbuffer); | |
1691 | if (ret) { | |
1692 | goto end; | |
1693 | } | |
1694 | ||
1695 | LTTNG_OPTIONAL_SET(&subbuffer->info.metadata.coherent, coherent); | |
1696 | ||
1697 | ret = get_current_subbuf_addr(stream, &addr); | |
1698 | if (ret) { | |
1699 | goto end; | |
1700 | } | |
1701 | ||
1702 | subbuffer->buffer.buffer = lttng_buffer_view_init( | |
1703 | addr, 0, subbuffer->info.data.padded_subbuf_size); | |
1704 | DBG("Got metadata packet with padded_subbuf_size = %lu, coherent = %s", | |
1705 | subbuffer->info.metadata.padded_subbuf_size, | |
1706 | coherent ? "true" : "false"); | |
1707 | end: | |
684c6783 MD |
1708 | /* |
1709 | * The caller only expects -ENODATA when there is no data to read, but | |
1710 | * the kernel tracer returns -EAGAIN when there is currently no data | |
1711 | * for a non-finalized stream, and -ENODATA when there is no data for a | |
1712 | * finalized stream. Those can be combined into a -ENODATA return value. | |
1713 | */ | |
823a3926 JG |
1714 | switch (ret) { |
1715 | case 0: | |
1716 | status = GET_NEXT_SUBBUFFER_STATUS_OK; | |
1717 | break; | |
1718 | case -ENODATA: | |
1719 | case -EAGAIN: | |
1720 | /* | |
1721 | * The caller only expects -ENODATA when there is no data to | |
1722 | * read, but the kernel tracer returns -EAGAIN when there is | |
1723 | * currently no data for a non-finalized stream, and -ENODATA | |
1724 | * when there is no data for a finalized stream. Those can be | |
1725 | * combined into a -ENODATA return value. | |
1726 | */ | |
1727 | status = GET_NEXT_SUBBUFFER_STATUS_NO_DATA; | |
1728 | break; | |
1729 | default: | |
1730 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; | |
1731 | break; | |
684c6783 MD |
1732 | } |
1733 | ||
823a3926 | 1734 | return status; |
f5ba75b4 JG |
1735 | } |
1736 | ||
6f9449c2 JG |
1737 | static |
1738 | int put_next_subbuffer(struct lttng_consumer_stream *stream, | |
1739 | struct stream_subbuffer *subbuffer) | |
1740 | { | |
1741 | const int ret = kernctl_put_next_subbuf(stream->wait_fd); | |
1742 | ||
1743 | if (ret) { | |
1744 | if (ret == -EFAULT) { | |
1745 | PERROR("Error in unreserving sub buffer"); | |
1746 | } else if (ret == -EIO) { | |
d41f73b7 | 1747 | /* Should never happen with newer LTTng versions */ |
6f9449c2 | 1748 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted"); |
d41f73b7 | 1749 | } |
d41f73b7 MD |
1750 | } |
1751 | ||
6f9449c2 JG |
1752 | return ret; |
1753 | } | |
1c20f0e2 | 1754 | |
f5ba75b4 JG |
1755 | static |
1756 | bool is_get_next_check_metadata_available(int tracer_fd) | |
1757 | { | |
0aeedd20 JG |
1758 | const int ret = kernctl_get_next_subbuf_metadata_check(tracer_fd, NULL); |
1759 | const bool available = ret != -ENOTTY; | |
1760 | ||
1761 | if (ret == 0) { | |
1762 | /* get succeeded, make sure to put the subbuffer. */ | |
1763 | kernctl_put_subbuf(tracer_fd); | |
1764 | } | |
1765 | ||
1766 | return available; | |
f5ba75b4 JG |
1767 | } |
1768 | ||
ee0350f8 MD |
1769 | static |
1770 | int signal_metadata(struct lttng_consumer_stream *stream, | |
1771 | struct lttng_consumer_local_data *ctx) | |
1772 | { | |
1773 | ASSERT_LOCKED(stream->metadata_rdv_lock); | |
1774 | return pthread_cond_broadcast(&stream->metadata_rdv) ? -errno : 0; | |
1775 | } | |
1776 | ||
f5ba75b4 JG |
1777 | static |
1778 | int lttng_kconsumer_set_stream_ops( | |
6f9449c2 JG |
1779 | struct lttng_consumer_stream *stream) |
1780 | { | |
f5ba75b4 JG |
1781 | int ret = 0; |
1782 | ||
1783 | if (stream->metadata_flag && stream->chan->is_live) { | |
1784 | DBG("Attempting to enable metadata bucketization for live consumers"); | |
1785 | if (is_get_next_check_metadata_available(stream->wait_fd)) { | |
1786 | DBG("Kernel tracer supports get_next_subbuffer_metadata_check, metadata will be accumulated until a coherent state is reached"); | |
1787 | stream->read_subbuffer_ops.get_next_subbuffer = | |
1788 | get_next_subbuffer_metadata_check; | |
1789 | ret = consumer_stream_enable_metadata_bucketization( | |
1790 | stream); | |
1791 | if (ret) { | |
1792 | goto end; | |
1793 | } | |
1794 | } else { | |
1795 | /* | |
1796 | * The kernel tracer version is too old to indicate | |
1797 | * when the metadata stream has reached a "coherent" | |
1798 | * (parseable) point. | |
1799 | * | |
1800 | * This means that a live viewer may see an incoherent | |
1801 | * sequence of metadata and fail to parse it. | |
1802 | */ | |
1803 | WARN("Kernel tracer does not support get_next_subbuffer_metadata_check which may cause live clients to fail to parse the metadata stream"); | |
1804 | metadata_bucket_destroy(stream->metadata_bucket); | |
1805 | stream->metadata_bucket = NULL; | |
1806 | } | |
ee0350f8 MD |
1807 | |
1808 | stream->read_subbuffer_ops.on_sleep = signal_metadata; | |
f5ba75b4 JG |
1809 | } |
1810 | ||
1811 | if (!stream->read_subbuffer_ops.get_next_subbuffer) { | |
1812 | if (stream->chan->output == CONSUMER_CHANNEL_MMAP) { | |
1813 | stream->read_subbuffer_ops.get_next_subbuffer = | |
1814 | get_next_subbuffer_mmap; | |
1815 | } else { | |
1816 | stream->read_subbuffer_ops.get_next_subbuffer = | |
1817 | get_next_subbuffer_splice; | |
1818 | } | |
94d49140 JD |
1819 | } |
1820 | ||
6f9449c2 JG |
1821 | if (stream->metadata_flag) { |
1822 | stream->read_subbuffer_ops.extract_subbuffer_info = | |
1823 | extract_metadata_subbuffer_info; | |
1824 | } else { | |
1825 | stream->read_subbuffer_ops.extract_subbuffer_info = | |
1826 | extract_data_subbuffer_info; | |
1827 | if (stream->chan->is_live) { | |
1828 | stream->read_subbuffer_ops.send_live_beacon = | |
1829 | consumer_flush_kernel_index; | |
1830 | } | |
309167d2 JD |
1831 | } |
1832 | ||
6f9449c2 | 1833 | stream->read_subbuffer_ops.put_next_subbuffer = put_next_subbuffer; |
f5ba75b4 JG |
1834 | end: |
1835 | return ret; | |
d41f73b7 MD |
1836 | } |
1837 | ||
1838 | int lttng_kconsumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
1839 | { | |
1840 | int ret; | |
ffe60014 DG |
1841 | |
1842 | assert(stream); | |
1843 | ||
2bba9e53 | 1844 | /* |
d2956687 JG |
1845 | * Don't create anything if this is set for streaming or if there is |
1846 | * no current trace chunk on the parent channel. | |
2bba9e53 | 1847 | */ |
d2956687 JG |
1848 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor && |
1849 | stream->chan->trace_chunk) { | |
1850 | ret = consumer_stream_create_output_files(stream, true); | |
1851 | if (ret) { | |
fe4477ee JD |
1852 | goto error; |
1853 | } | |
ffe60014 | 1854 | } |
d41f73b7 | 1855 | |
d41f73b7 MD |
1856 | if (stream->output == LTTNG_EVENT_MMAP) { |
1857 | /* get the len of the mmap region */ | |
1858 | unsigned long mmap_len; | |
1859 | ||
1860 | ret = kernctl_get_mmap_len(stream->wait_fd, &mmap_len); | |
1861 | if (ret != 0) { | |
ffe60014 | 1862 | PERROR("kernctl_get_mmap_len"); |
d41f73b7 MD |
1863 | goto error_close_fd; |
1864 | } | |
1865 | stream->mmap_len = (size_t) mmap_len; | |
1866 | ||
ffe60014 DG |
1867 | stream->mmap_base = mmap(NULL, stream->mmap_len, PROT_READ, |
1868 | MAP_PRIVATE, stream->wait_fd, 0); | |
d41f73b7 | 1869 | if (stream->mmap_base == MAP_FAILED) { |
ffe60014 | 1870 | PERROR("Error mmaping"); |
d41f73b7 MD |
1871 | ret = -1; |
1872 | goto error_close_fd; | |
1873 | } | |
1874 | } | |
1875 | ||
f5ba75b4 JG |
1876 | ret = lttng_kconsumer_set_stream_ops(stream); |
1877 | if (ret) { | |
1878 | goto error_close_fd; | |
1879 | } | |
6f9449c2 | 1880 | |
d41f73b7 MD |
1881 | /* we return 0 to let the library handle the FD internally */ |
1882 | return 0; | |
1883 | ||
1884 | error_close_fd: | |
2f225ce2 | 1885 | if (stream->out_fd >= 0) { |
d41f73b7 MD |
1886 | int err; |
1887 | ||
1888 | err = close(stream->out_fd); | |
1889 | assert(!err); | |
2f225ce2 | 1890 | stream->out_fd = -1; |
d41f73b7 MD |
1891 | } |
1892 | error: | |
1893 | return ret; | |
1894 | } | |
1895 | ||
ca22feea DG |
1896 | /* |
1897 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
1898 | * stream. Consumer data lock MUST be acquired before calling this function |
1899 | * and the stream lock. | |
ca22feea | 1900 | * |
6d805429 | 1901 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
1902 | * data is available for trace viewer reading. |
1903 | */ | |
6d805429 | 1904 | int lttng_kconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
1905 | { |
1906 | int ret; | |
1907 | ||
1908 | assert(stream); | |
1909 | ||
873b9e9a MD |
1910 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
1911 | ret = 0; | |
1912 | goto end; | |
1913 | } | |
1914 | ||
ca22feea DG |
1915 | ret = kernctl_get_next_subbuf(stream->wait_fd); |
1916 | if (ret == 0) { | |
1917 | /* There is still data so let's put back this subbuffer. */ | |
1918 | ret = kernctl_put_subbuf(stream->wait_fd); | |
1919 | assert(ret == 0); | |
6d805429 | 1920 | ret = 1; /* Data is pending */ |
4e9a4686 | 1921 | goto end; |
ca22feea DG |
1922 | } |
1923 | ||
6d805429 DG |
1924 | /* Data is NOT pending and ready to be read. */ |
1925 | ret = 0; | |
ca22feea | 1926 | |
6efae65e DG |
1927 | end: |
1928 | return ret; | |
ca22feea | 1929 | } |