Commit | Line | Data |
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3bd1e081 | 1 | /* |
21cf9b6b | 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 MD |
11 | #include <poll.h> |
12 | #include <pthread.h> | |
13 | #include <stdlib.h> | |
14 | #include <string.h> | |
15 | #include <sys/mman.h> | |
16 | #include <sys/socket.h> | |
17 | #include <sys/types.h> | |
77c7c900 | 18 | #include <inttypes.h> |
3bd1e081 | 19 | #include <unistd.h> |
dbb5dfe6 | 20 | #include <sys/stat.h> |
f5ba75b4 | 21 | #include <stdint.h> |
3bd1e081 | 22 | |
c9e313bc SM |
23 | #include <bin/lttng-consumerd/health-consumerd.hpp> |
24 | #include <common/common.hpp> | |
25 | #include <common/kernel-ctl/kernel-ctl.hpp> | |
26 | #include <common/sessiond-comm/sessiond-comm.hpp> | |
27 | #include <common/sessiond-comm/relayd.hpp> | |
28 | #include <common/compat/fcntl.hpp> | |
29 | #include <common/compat/endian.hpp> | |
30 | #include <common/pipe.hpp> | |
31 | #include <common/relayd/relayd.hpp> | |
32 | #include <common/utils.hpp> | |
33 | #include <common/consumer/consumer-stream.hpp> | |
34 | #include <common/index/index.hpp> | |
35 | #include <common/consumer/consumer-timer.hpp> | |
36 | #include <common/optional.hpp> | |
37 | #include <common/buffer-view.hpp> | |
38 | #include <common/consumer/consumer.hpp> | |
39 | #include <common/consumer/metadata-bucket.hpp> | |
0857097f | 40 | |
c9e313bc | 41 | #include "kernel-consumer.hpp" |
3bd1e081 | 42 | |
fa29bfbf | 43 | extern struct lttng_consumer_global_data the_consumer_data; |
3bd1e081 | 44 | extern int consumer_poll_timeout; |
3bd1e081 | 45 | |
3bd1e081 MD |
46 | /* |
47 | * Take a snapshot for a specific fd | |
48 | * | |
49 | * Returns 0 on success, < 0 on error | |
50 | */ | |
ffe60014 | 51 | int lttng_kconsumer_take_snapshot(struct lttng_consumer_stream *stream) |
3bd1e081 MD |
52 | { |
53 | int ret = 0; | |
54 | int infd = stream->wait_fd; | |
55 | ||
56 | ret = kernctl_snapshot(infd); | |
d2d2f190 JD |
57 | /* |
58 | * -EAGAIN is not an error, it just means that there is no data to | |
59 | * be read. | |
60 | */ | |
61 | if (ret != 0 && ret != -EAGAIN) { | |
5a510c9f | 62 | PERROR("Getting sub-buffer snapshot."); |
3bd1e081 MD |
63 | } |
64 | ||
65 | return ret; | |
66 | } | |
67 | ||
e9404c27 JG |
68 | /* |
69 | * Sample consumed and produced positions for a specific fd. | |
70 | * | |
71 | * Returns 0 on success, < 0 on error. | |
72 | */ | |
73 | int lttng_kconsumer_sample_snapshot_positions( | |
74 | struct lttng_consumer_stream *stream) | |
75 | { | |
a0377dfe | 76 | LTTNG_ASSERT(stream); |
e9404c27 JG |
77 | |
78 | return kernctl_snapshot_sample_positions(stream->wait_fd); | |
79 | } | |
80 | ||
3bd1e081 MD |
81 | /* |
82 | * Get the produced position | |
83 | * | |
84 | * Returns 0 on success, < 0 on error | |
85 | */ | |
ffe60014 | 86 | int lttng_kconsumer_get_produced_snapshot(struct lttng_consumer_stream *stream, |
3bd1e081 MD |
87 | unsigned long *pos) |
88 | { | |
89 | int ret; | |
90 | int infd = stream->wait_fd; | |
91 | ||
92 | ret = kernctl_snapshot_get_produced(infd, pos); | |
93 | if (ret != 0) { | |
5a510c9f | 94 | PERROR("kernctl_snapshot_get_produced"); |
3bd1e081 MD |
95 | } |
96 | ||
97 | return ret; | |
98 | } | |
99 | ||
07b86b52 JD |
100 | /* |
101 | * Get the consumerd position | |
102 | * | |
103 | * Returns 0 on success, < 0 on error | |
104 | */ | |
105 | int lttng_kconsumer_get_consumed_snapshot(struct lttng_consumer_stream *stream, | |
106 | unsigned long *pos) | |
107 | { | |
108 | int ret; | |
109 | int infd = stream->wait_fd; | |
110 | ||
111 | ret = kernctl_snapshot_get_consumed(infd, pos); | |
112 | if (ret != 0) { | |
5a510c9f | 113 | PERROR("kernctl_snapshot_get_consumed"); |
07b86b52 JD |
114 | } |
115 | ||
116 | return ret; | |
117 | } | |
118 | ||
128708c3 JG |
119 | static |
120 | int get_current_subbuf_addr(struct lttng_consumer_stream *stream, | |
121 | const char **addr) | |
122 | { | |
123 | int ret; | |
124 | unsigned long mmap_offset; | |
97535efa | 125 | const char *mmap_base = (const char *) stream->mmap_base; |
128708c3 JG |
126 | |
127 | ret = kernctl_get_mmap_read_offset(stream->wait_fd, &mmap_offset); | |
128 | if (ret < 0) { | |
129 | PERROR("Failed to get mmap read offset"); | |
130 | goto error; | |
131 | } | |
132 | ||
133 | *addr = mmap_base + mmap_offset; | |
134 | error: | |
135 | return ret; | |
136 | } | |
137 | ||
a4beac76 JR |
138 | static void finalize_snapshot_stream( |
139 | struct lttng_consumer_stream *stream, uint64_t relayd_id) | |
140 | { | |
141 | ASSERT_LOCKED(stream->lock); | |
142 | ||
143 | if (relayd_id == (uint64_t) -1ULL) { | |
144 | if (stream->out_fd >= 0) { | |
145 | const int ret = close(stream->out_fd); | |
146 | ||
147 | if (ret < 0) { | |
148 | PERROR("Failed to close stream snapshot output file descriptor"); | |
149 | } | |
150 | ||
151 | stream->out_fd = -1; | |
152 | } | |
153 | } else { | |
154 | close_relayd_stream(stream); | |
155 | stream->net_seq_idx = (uint64_t) -1ULL; | |
156 | } | |
157 | ||
158 | lttng_trace_chunk_put(stream->trace_chunk); | |
159 | stream->trace_chunk = NULL; | |
160 | } | |
161 | ||
07b86b52 JD |
162 | /* |
163 | * Take a snapshot of all the stream of a channel | |
3eb928aa | 164 | * RCU read-side lock must be held across this function to ensure existence of |
947bd097 | 165 | * channel. |
07b86b52 JD |
166 | * |
167 | * Returns 0 on success, < 0 on error | |
168 | */ | |
f72bb42f JG |
169 | static int lttng_kconsumer_snapshot_channel( |
170 | struct lttng_consumer_channel *channel, | |
171 | uint64_t key, char *path, uint64_t relayd_id, | |
f46376a1 | 172 | uint64_t nb_packets_per_stream) |
07b86b52 JD |
173 | { |
174 | int ret; | |
07b86b52 JD |
175 | struct lttng_consumer_stream *stream; |
176 | ||
6a00837f | 177 | DBG("Kernel consumer snapshot channel %" PRIu64, key); |
07b86b52 | 178 | |
947bd097 JR |
179 | /* Prevent channel modifications while we perform the snapshot.*/ |
180 | pthread_mutex_lock(&channel->lock); | |
181 | ||
07b86b52 JD |
182 | rcu_read_lock(); |
183 | ||
07b86b52 JD |
184 | /* Splice is not supported yet for channel snapshot. */ |
185 | if (channel->output != CONSUMER_CHANNEL_MMAP) { | |
9381314c JG |
186 | ERR("Unsupported output type for channel \"%s\": mmap output is required to record a snapshot", |
187 | channel->name); | |
07b86b52 JD |
188 | ret = -1; |
189 | goto end; | |
190 | } | |
191 | ||
10a50311 | 192 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { |
923333cd | 193 | unsigned long consumed_pos, produced_pos; |
9ce5646a MD |
194 | |
195 | health_code_update(); | |
196 | ||
07b86b52 JD |
197 | /* |
198 | * Lock stream because we are about to change its state. | |
199 | */ | |
200 | pthread_mutex_lock(&stream->lock); | |
201 | ||
a0377dfe | 202 | LTTNG_ASSERT(channel->trace_chunk); |
d2956687 JG |
203 | if (!lttng_trace_chunk_get(channel->trace_chunk)) { |
204 | /* | |
205 | * Can't happen barring an internal error as the channel | |
206 | * holds a reference to the trace chunk. | |
207 | */ | |
208 | ERR("Failed to acquire reference to channel's trace chunk"); | |
209 | ret = -1; | |
210 | goto end_unlock; | |
211 | } | |
a0377dfe | 212 | LTTNG_ASSERT(!stream->trace_chunk); |
d2956687 JG |
213 | stream->trace_chunk = channel->trace_chunk; |
214 | ||
29decac3 DG |
215 | /* |
216 | * Assign the received relayd ID so we can use it for streaming. The streams | |
217 | * are not visible to anyone so this is OK to change it. | |
218 | */ | |
07b86b52 JD |
219 | stream->net_seq_idx = relayd_id; |
220 | channel->relayd_id = relayd_id; | |
221 | if (relayd_id != (uint64_t) -1ULL) { | |
10a50311 | 222 | ret = consumer_send_relayd_stream(stream, path); |
07b86b52 JD |
223 | if (ret < 0) { |
224 | ERR("sending stream to relayd"); | |
a4beac76 | 225 | goto error_finalize_stream; |
07b86b52 | 226 | } |
07b86b52 | 227 | } else { |
d2956687 JG |
228 | ret = consumer_stream_create_output_files(stream, |
229 | false); | |
07b86b52 | 230 | if (ret < 0) { |
a4beac76 | 231 | goto error_finalize_stream; |
07b86b52 | 232 | } |
d2956687 JG |
233 | DBG("Kernel consumer snapshot stream (%" PRIu64 ")", |
234 | stream->key); | |
07b86b52 JD |
235 | } |
236 | ||
f22dd891 | 237 | ret = kernctl_buffer_flush_empty(stream->wait_fd); |
07b86b52 | 238 | if (ret < 0) { |
f22dd891 MD |
239 | /* |
240 | * Doing a buffer flush which does not take into | |
241 | * account empty packets. This is not perfect | |
242 | * for stream intersection, but required as a | |
243 | * fall-back when "flush_empty" is not | |
244 | * implemented by lttng-modules. | |
245 | */ | |
246 | ret = kernctl_buffer_flush(stream->wait_fd); | |
247 | if (ret < 0) { | |
248 | ERR("Failed to flush kernel stream"); | |
a4beac76 | 249 | goto error_finalize_stream; |
f22dd891 | 250 | } |
07b86b52 JD |
251 | goto end_unlock; |
252 | } | |
253 | ||
254 | ret = lttng_kconsumer_take_snapshot(stream); | |
255 | if (ret < 0) { | |
256 | ERR("Taking kernel snapshot"); | |
a4beac76 | 257 | goto error_finalize_stream; |
07b86b52 JD |
258 | } |
259 | ||
260 | ret = lttng_kconsumer_get_produced_snapshot(stream, &produced_pos); | |
261 | if (ret < 0) { | |
262 | ERR("Produced kernel snapshot position"); | |
a4beac76 | 263 | goto error_finalize_stream; |
07b86b52 JD |
264 | } |
265 | ||
266 | ret = lttng_kconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
267 | if (ret < 0) { | |
268 | ERR("Consumerd kernel snapshot position"); | |
a4beac76 | 269 | goto error_finalize_stream; |
07b86b52 JD |
270 | } |
271 | ||
d07ceecd MD |
272 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
273 | produced_pos, nb_packets_per_stream, | |
274 | stream->max_sb_size); | |
5c786ded | 275 | |
9377d830 | 276 | while ((long) (consumed_pos - produced_pos) < 0) { |
07b86b52 JD |
277 | ssize_t read_len; |
278 | unsigned long len, padded_len; | |
128708c3 | 279 | const char *subbuf_addr; |
fd424d99 | 280 | struct lttng_buffer_view subbuf_view; |
07b86b52 | 281 | |
9ce5646a | 282 | health_code_update(); |
07b86b52 JD |
283 | DBG("Kernel consumer taking snapshot at pos %lu", consumed_pos); |
284 | ||
285 | ret = kernctl_get_subbuf(stream->wait_fd, &consumed_pos); | |
286 | if (ret < 0) { | |
32af2c95 | 287 | if (ret != -EAGAIN) { |
07b86b52 | 288 | PERROR("kernctl_get_subbuf snapshot"); |
a4beac76 | 289 | goto error_finalize_stream; |
07b86b52 JD |
290 | } |
291 | DBG("Kernel consumer get subbuf failed. Skipping it."); | |
292 | consumed_pos += stream->max_sb_size; | |
ddc93ee4 | 293 | stream->chan->lost_packets++; |
07b86b52 JD |
294 | continue; |
295 | } | |
296 | ||
297 | ret = kernctl_get_subbuf_size(stream->wait_fd, &len); | |
298 | if (ret < 0) { | |
299 | ERR("Snapshot kernctl_get_subbuf_size"); | |
29decac3 | 300 | goto error_put_subbuf; |
07b86b52 JD |
301 | } |
302 | ||
303 | ret = kernctl_get_padded_subbuf_size(stream->wait_fd, &padded_len); | |
304 | if (ret < 0) { | |
305 | ERR("Snapshot kernctl_get_padded_subbuf_size"); | |
29decac3 | 306 | goto error_put_subbuf; |
07b86b52 JD |
307 | } |
308 | ||
128708c3 JG |
309 | ret = get_current_subbuf_addr(stream, &subbuf_addr); |
310 | if (ret) { | |
311 | goto error_put_subbuf; | |
312 | } | |
313 | ||
fd424d99 JG |
314 | subbuf_view = lttng_buffer_view_init( |
315 | subbuf_addr, 0, padded_len); | |
f5ba75b4 | 316 | read_len = lttng_consumer_on_read_subbuffer_mmap( |
fd424d99 | 317 | stream, &subbuf_view, |
6f9449c2 | 318 | padded_len - len); |
07b86b52 | 319 | /* |
29decac3 DG |
320 | * We write the padded len in local tracefiles but the data len |
321 | * when using a relay. Display the error but continue processing | |
322 | * to try to release the subbuffer. | |
07b86b52 JD |
323 | */ |
324 | if (relayd_id != (uint64_t) -1ULL) { | |
325 | if (read_len != len) { | |
326 | ERR("Error sending to the relay (ret: %zd != len: %lu)", | |
327 | read_len, len); | |
328 | } | |
329 | } else { | |
330 | if (read_len != padded_len) { | |
331 | ERR("Error writing to tracefile (ret: %zd != len: %lu)", | |
332 | read_len, padded_len); | |
333 | } | |
334 | } | |
335 | ||
336 | ret = kernctl_put_subbuf(stream->wait_fd); | |
337 | if (ret < 0) { | |
338 | ERR("Snapshot kernctl_put_subbuf"); | |
a4beac76 | 339 | goto error_finalize_stream; |
07b86b52 JD |
340 | } |
341 | consumed_pos += stream->max_sb_size; | |
342 | } | |
343 | ||
a4beac76 | 344 | finalize_snapshot_stream(stream, relayd_id); |
07b86b52 JD |
345 | pthread_mutex_unlock(&stream->lock); |
346 | } | |
347 | ||
348 | /* All good! */ | |
349 | ret = 0; | |
350 | goto end; | |
351 | ||
29decac3 DG |
352 | error_put_subbuf: |
353 | ret = kernctl_put_subbuf(stream->wait_fd); | |
354 | if (ret < 0) { | |
355 | ERR("Snapshot kernctl_put_subbuf error path"); | |
356 | } | |
a4beac76 JR |
357 | error_finalize_stream: |
358 | finalize_snapshot_stream(stream, relayd_id); | |
07b86b52 JD |
359 | end_unlock: |
360 | pthread_mutex_unlock(&stream->lock); | |
361 | end: | |
362 | rcu_read_unlock(); | |
947bd097 | 363 | pthread_mutex_unlock(&channel->lock); |
07b86b52 JD |
364 | return ret; |
365 | } | |
366 | ||
367 | /* | |
368 | * Read the whole metadata available for a snapshot. | |
3eb928aa | 369 | * RCU read-side lock must be held across this function to ensure existence of |
947bd097 | 370 | * metadata_channel. |
07b86b52 JD |
371 | * |
372 | * Returns 0 on success, < 0 on error | |
373 | */ | |
d2956687 JG |
374 | static int lttng_kconsumer_snapshot_metadata( |
375 | struct lttng_consumer_channel *metadata_channel, | |
3eb928aa MD |
376 | uint64_t key, char *path, uint64_t relayd_id, |
377 | struct lttng_consumer_local_data *ctx) | |
07b86b52 | 378 | { |
d771f832 DG |
379 | int ret, use_relayd = 0; |
380 | ssize_t ret_read; | |
07b86b52 | 381 | struct lttng_consumer_stream *metadata_stream; |
d771f832 | 382 | |
a0377dfe | 383 | LTTNG_ASSERT(ctx); |
07b86b52 JD |
384 | |
385 | DBG("Kernel consumer snapshot metadata with key %" PRIu64 " at path %s", | |
386 | key, path); | |
387 | ||
388 | rcu_read_lock(); | |
389 | ||
07b86b52 | 390 | metadata_stream = metadata_channel->metadata_stream; |
a0377dfe | 391 | LTTNG_ASSERT(metadata_stream); |
d2956687 | 392 | |
947bd097 | 393 | metadata_stream->read_subbuffer_ops.lock(metadata_stream); |
a0377dfe FD |
394 | LTTNG_ASSERT(metadata_channel->trace_chunk); |
395 | LTTNG_ASSERT(metadata_stream->trace_chunk); | |
07b86b52 | 396 | |
d771f832 | 397 | /* Flag once that we have a valid relayd for the stream. */ |
e2039c7a | 398 | if (relayd_id != (uint64_t) -1ULL) { |
d771f832 DG |
399 | use_relayd = 1; |
400 | } | |
401 | ||
402 | if (use_relayd) { | |
10a50311 | 403 | ret = consumer_send_relayd_stream(metadata_stream, path); |
e2039c7a | 404 | if (ret < 0) { |
fa27abe8 | 405 | goto error_snapshot; |
e2039c7a | 406 | } |
e2039c7a | 407 | } else { |
d2956687 JG |
408 | ret = consumer_stream_create_output_files(metadata_stream, |
409 | false); | |
e2039c7a | 410 | if (ret < 0) { |
fa27abe8 | 411 | goto error_snapshot; |
e2039c7a | 412 | } |
07b86b52 | 413 | } |
07b86b52 | 414 | |
d771f832 | 415 | do { |
9ce5646a MD |
416 | health_code_update(); |
417 | ||
6f9449c2 | 418 | ret_read = lttng_consumer_read_subbuffer(metadata_stream, ctx, true); |
d771f832 | 419 | if (ret_read < 0) { |
6e5e3c51 MD |
420 | ERR("Kernel snapshot reading metadata subbuffer (ret: %zd)", |
421 | ret_read); | |
422 | ret = ret_read; | |
423 | goto error_snapshot; | |
07b86b52 | 424 | } |
6e5e3c51 | 425 | } while (ret_read > 0); |
07b86b52 | 426 | |
d771f832 DG |
427 | if (use_relayd) { |
428 | close_relayd_stream(metadata_stream); | |
429 | metadata_stream->net_seq_idx = (uint64_t) -1ULL; | |
430 | } else { | |
fdf9986c MD |
431 | if (metadata_stream->out_fd >= 0) { |
432 | ret = close(metadata_stream->out_fd); | |
433 | if (ret < 0) { | |
434 | PERROR("Kernel consumer snapshot metadata close out_fd"); | |
435 | /* | |
436 | * Don't go on error here since the snapshot was successful at this | |
437 | * point but somehow the close failed. | |
438 | */ | |
439 | } | |
440 | metadata_stream->out_fd = -1; | |
d2956687 JG |
441 | lttng_trace_chunk_put(metadata_stream->trace_chunk); |
442 | metadata_stream->trace_chunk = NULL; | |
e2039c7a | 443 | } |
e2039c7a JD |
444 | } |
445 | ||
07b86b52 | 446 | ret = 0; |
fa27abe8 | 447 | error_snapshot: |
947bd097 | 448 | metadata_stream->read_subbuffer_ops.unlock(metadata_stream); |
cf53a8a6 JD |
449 | consumer_stream_destroy(metadata_stream, NULL); |
450 | metadata_channel->metadata_stream = NULL; | |
07b86b52 JD |
451 | rcu_read_unlock(); |
452 | return ret; | |
453 | } | |
454 | ||
1803a064 MD |
455 | /* |
456 | * Receive command from session daemon and process it. | |
457 | * | |
458 | * Return 1 on success else a negative value or 0. | |
459 | */ | |
3bd1e081 MD |
460 | int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
461 | int sock, struct pollfd *consumer_sockpoll) | |
462 | { | |
0c5b3718 | 463 | int ret_func; |
0c759fc9 | 464 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 MD |
465 | struct lttcomm_consumer_msg msg; |
466 | ||
9ce5646a MD |
467 | health_code_update(); |
468 | ||
0c5b3718 SM |
469 | { |
470 | ssize_t ret_recv; | |
471 | ||
472 | ret_recv = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); | |
473 | if (ret_recv != sizeof(msg)) { | |
474 | if (ret_recv > 0) { | |
475 | lttng_consumer_send_error(ctx, | |
476 | LTTCOMM_CONSUMERD_ERROR_RECV_CMD); | |
477 | ret_recv = -1; | |
478 | } | |
479 | return ret_recv; | |
1803a064 | 480 | } |
3bd1e081 | 481 | } |
9ce5646a MD |
482 | |
483 | health_code_update(); | |
484 | ||
84382d49 | 485 | /* Deprecated command */ |
a0377dfe | 486 | LTTNG_ASSERT(msg.cmd_type != LTTNG_CONSUMER_STOP); |
3bd1e081 | 487 | |
9ce5646a MD |
488 | health_code_update(); |
489 | ||
b0b335c8 MD |
490 | /* relayd needs RCU read-side protection */ |
491 | rcu_read_lock(); | |
492 | ||
3bd1e081 | 493 | switch (msg.cmd_type) { |
00e2e675 DG |
494 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
495 | { | |
4222116f JR |
496 | uint32_t major = msg.u.relayd_sock.major; |
497 | uint32_t minor = msg.u.relayd_sock.minor; | |
498 | enum lttcomm_sock_proto protocol = (enum lttcomm_sock_proto) | |
499 | msg.u.relayd_sock.relayd_socket_protocol; | |
500 | ||
f50f23d9 | 501 | /* Session daemon status message are handled in the following call. */ |
2527bf85 | 502 | consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
4222116f JR |
503 | msg.u.relayd_sock.type, ctx, sock, |
504 | consumer_sockpoll, msg.u.relayd_sock.session_id, | |
505 | msg.u.relayd_sock.relayd_session_id, major, | |
506 | minor, protocol); | |
00e2e675 DG |
507 | goto end_nosignal; |
508 | } | |
3bd1e081 MD |
509 | case LTTNG_CONSUMER_ADD_CHANNEL: |
510 | { | |
511 | struct lttng_consumer_channel *new_channel; | |
afbf29db | 512 | int ret_send_status, ret_add_channel = 0; |
d2956687 | 513 | const uint64_t chunk_id = msg.u.channel.chunk_id.value; |
3bd1e081 | 514 | |
9ce5646a MD |
515 | health_code_update(); |
516 | ||
f50f23d9 | 517 | /* First send a status message before receiving the fds. */ |
0c5b3718 SM |
518 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
519 | if (ret_send_status < 0) { | |
f50f23d9 | 520 | /* Somehow, the session daemon is not responding anymore. */ |
1803a064 | 521 | goto error_fatal; |
f50f23d9 | 522 | } |
9ce5646a MD |
523 | |
524 | health_code_update(); | |
525 | ||
d88aee68 | 526 | DBG("consumer_add_channel %" PRIu64, msg.u.channel.channel_key); |
3bd1e081 | 527 | new_channel = consumer_allocate_channel(msg.u.channel.channel_key, |
d2956687 JG |
528 | msg.u.channel.session_id, |
529 | msg.u.channel.chunk_id.is_set ? | |
530 | &chunk_id : NULL, | |
531 | msg.u.channel.pathname, | |
532 | msg.u.channel.name, | |
1624d5b7 JD |
533 | msg.u.channel.relayd_id, msg.u.channel.output, |
534 | msg.u.channel.tracefile_size, | |
1950109e | 535 | msg.u.channel.tracefile_count, 0, |
ecc48a90 | 536 | msg.u.channel.monitor, |
d7ba1388 | 537 | msg.u.channel.live_timer_interval, |
a2814ea7 | 538 | msg.u.channel.is_live, |
3d071855 | 539 | NULL, NULL); |
3bd1e081 | 540 | if (new_channel == NULL) { |
f73fabfd | 541 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
3bd1e081 MD |
542 | goto end_nosignal; |
543 | } | |
ffe60014 | 544 | new_channel->nb_init_stream_left = msg.u.channel.nb_init_streams; |
95a1109b JD |
545 | switch (msg.u.channel.output) { |
546 | case LTTNG_EVENT_SPLICE: | |
547 | new_channel->output = CONSUMER_CHANNEL_SPLICE; | |
548 | break; | |
549 | case LTTNG_EVENT_MMAP: | |
550 | new_channel->output = CONSUMER_CHANNEL_MMAP; | |
551 | break; | |
552 | default: | |
553 | ERR("Channel output unknown %d", msg.u.channel.output); | |
554 | goto end_nosignal; | |
555 | } | |
ffe60014 DG |
556 | |
557 | /* Translate and save channel type. */ | |
558 | switch (msg.u.channel.type) { | |
559 | case CONSUMER_CHANNEL_TYPE_DATA: | |
560 | case CONSUMER_CHANNEL_TYPE_METADATA: | |
97535efa | 561 | new_channel->type = (consumer_channel_type) msg.u.channel.type; |
ffe60014 DG |
562 | break; |
563 | default: | |
a0377dfe | 564 | abort(); |
ffe60014 DG |
565 | goto end_nosignal; |
566 | }; | |
567 | ||
9ce5646a MD |
568 | health_code_update(); |
569 | ||
3bd1e081 | 570 | if (ctx->on_recv_channel != NULL) { |
0c5b3718 SM |
571 | int ret_recv_channel = |
572 | ctx->on_recv_channel(new_channel); | |
573 | if (ret_recv_channel == 0) { | |
574 | ret_add_channel = consumer_add_channel( | |
575 | new_channel, ctx); | |
576 | } else if (ret_recv_channel < 0) { | |
3bd1e081 MD |
577 | goto end_nosignal; |
578 | } | |
579 | } else { | |
0c5b3718 SM |
580 | ret_add_channel = |
581 | consumer_add_channel(new_channel, ctx); | |
3bd1e081 | 582 | } |
0c5b3718 SM |
583 | if (msg.u.channel.type == CONSUMER_CHANNEL_TYPE_DATA && |
584 | !ret_add_channel) { | |
e9404c27 JG |
585 | int monitor_start_ret; |
586 | ||
587 | DBG("Consumer starting monitor timer"); | |
94d49140 JD |
588 | consumer_timer_live_start(new_channel, |
589 | msg.u.channel.live_timer_interval); | |
e9404c27 JG |
590 | monitor_start_ret = consumer_timer_monitor_start( |
591 | new_channel, | |
592 | msg.u.channel.monitor_timer_interval); | |
593 | if (monitor_start_ret < 0) { | |
594 | ERR("Starting channel monitoring timer failed"); | |
595 | goto end_nosignal; | |
596 | } | |
94d49140 | 597 | } |
e43c41c5 | 598 | |
9ce5646a MD |
599 | health_code_update(); |
600 | ||
e43c41c5 | 601 | /* If we received an error in add_channel, we need to report it. */ |
0c5b3718 SM |
602 | if (ret_add_channel < 0) { |
603 | ret_send_status = consumer_send_status_msg( | |
604 | sock, ret_add_channel); | |
605 | if (ret_send_status < 0) { | |
1803a064 MD |
606 | goto error_fatal; |
607 | } | |
e43c41c5 JD |
608 | goto end_nosignal; |
609 | } | |
610 | ||
3bd1e081 MD |
611 | goto end_nosignal; |
612 | } | |
613 | case LTTNG_CONSUMER_ADD_STREAM: | |
614 | { | |
dae10966 DG |
615 | int fd; |
616 | struct lttng_pipe *stream_pipe; | |
00e2e675 | 617 | struct lttng_consumer_stream *new_stream; |
ffe60014 | 618 | struct lttng_consumer_channel *channel; |
c80048c6 | 619 | int alloc_ret = 0; |
0c5b3718 SM |
620 | int ret_send_status, ret_poll, ret_get_max_subbuf_size; |
621 | ssize_t ret_pipe_write, ret_recv; | |
3bd1e081 | 622 | |
ffe60014 DG |
623 | /* |
624 | * Get stream's channel reference. Needed when adding the stream to the | |
625 | * global hash table. | |
626 | */ | |
627 | channel = consumer_find_channel(msg.u.stream.channel_key); | |
628 | if (!channel) { | |
629 | /* | |
630 | * We could not find the channel. Can happen if cpu hotplug | |
631 | * happens while tearing down. | |
632 | */ | |
d88aee68 | 633 | ERR("Unable to find channel key %" PRIu64, msg.u.stream.channel_key); |
e462382a | 634 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
ffe60014 DG |
635 | } |
636 | ||
9ce5646a MD |
637 | health_code_update(); |
638 | ||
f50f23d9 | 639 | /* First send a status message before receiving the fds. */ |
0c5b3718 SM |
640 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
641 | if (ret_send_status < 0) { | |
d771f832 | 642 | /* Somehow, the session daemon is not responding anymore. */ |
c5c7998f | 643 | goto error_add_stream_fatal; |
1803a064 | 644 | } |
9ce5646a MD |
645 | |
646 | health_code_update(); | |
647 | ||
0c759fc9 | 648 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
d771f832 | 649 | /* Channel was not found. */ |
c5c7998f | 650 | goto error_add_stream_nosignal; |
f50f23d9 DG |
651 | } |
652 | ||
d771f832 | 653 | /* Blocking call */ |
9ce5646a | 654 | health_poll_entry(); |
0c5b3718 | 655 | ret_poll = lttng_consumer_poll_socket(consumer_sockpoll); |
9ce5646a | 656 | health_poll_exit(); |
0c5b3718 | 657 | if (ret_poll) { |
c5c7998f | 658 | goto error_add_stream_fatal; |
3bd1e081 | 659 | } |
00e2e675 | 660 | |
9ce5646a MD |
661 | health_code_update(); |
662 | ||
00e2e675 | 663 | /* Get stream file descriptor from socket */ |
0c5b3718 SM |
664 | ret_recv = lttcomm_recv_fds_unix_sock(sock, &fd, 1); |
665 | if (ret_recv != sizeof(fd)) { | |
f73fabfd | 666 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
0c5b3718 | 667 | ret_func = ret_recv; |
c5c7998f | 668 | goto end; |
3bd1e081 | 669 | } |
3bd1e081 | 670 | |
9ce5646a MD |
671 | health_code_update(); |
672 | ||
f50f23d9 DG |
673 | /* |
674 | * Send status code to session daemon only if the recv works. If the | |
675 | * above recv() failed, the session daemon is notified through the | |
676 | * error socket and the teardown is eventually done. | |
677 | */ | |
0c5b3718 SM |
678 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
679 | if (ret_send_status < 0) { | |
f50f23d9 | 680 | /* Somehow, the session daemon is not responding anymore. */ |
c5c7998f | 681 | goto error_add_stream_nosignal; |
f50f23d9 DG |
682 | } |
683 | ||
9ce5646a MD |
684 | health_code_update(); |
685 | ||
d2956687 | 686 | pthread_mutex_lock(&channel->lock); |
6f9449c2 | 687 | new_stream = consumer_stream_create( |
49f45573 JG |
688 | channel, |
689 | channel->key, | |
ffe60014 | 690 | fd, |
ffe60014 | 691 | channel->name, |
ffe60014 DG |
692 | channel->relayd_id, |
693 | channel->session_id, | |
d2956687 | 694 | channel->trace_chunk, |
ffe60014 DG |
695 | msg.u.stream.cpu, |
696 | &alloc_ret, | |
4891ece8 | 697 | channel->type, |
d2956687 | 698 | channel->monitor); |
3bd1e081 | 699 | if (new_stream == NULL) { |
c80048c6 MD |
700 | switch (alloc_ret) { |
701 | case -ENOMEM: | |
702 | case -EINVAL: | |
703 | default: | |
704 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
705 | break; | |
c80048c6 | 706 | } |
d2956687 | 707 | pthread_mutex_unlock(&channel->lock); |
c5c7998f | 708 | goto error_add_stream_nosignal; |
3bd1e081 | 709 | } |
d771f832 | 710 | |
ffe60014 | 711 | new_stream->wait_fd = fd; |
0c5b3718 SM |
712 | ret_get_max_subbuf_size = kernctl_get_max_subbuf_size( |
713 | new_stream->wait_fd, &new_stream->max_sb_size); | |
714 | if (ret_get_max_subbuf_size < 0) { | |
d05185fa JG |
715 | pthread_mutex_unlock(&channel->lock); |
716 | ERR("Failed to get kernel maximal subbuffer size"); | |
c5c7998f | 717 | goto error_add_stream_nosignal; |
d05185fa JG |
718 | } |
719 | ||
d9a2e16e JD |
720 | consumer_stream_update_channel_attributes(new_stream, |
721 | channel); | |
00e2e675 | 722 | |
a0c83db9 DG |
723 | /* |
724 | * We've just assigned the channel to the stream so increment the | |
07b86b52 JD |
725 | * refcount right now. We don't need to increment the refcount for |
726 | * streams in no monitor because we handle manually the cleanup of | |
727 | * those. It is very important to make sure there is NO prior | |
728 | * consumer_del_stream() calls or else the refcount will be unbalanced. | |
a0c83db9 | 729 | */ |
07b86b52 JD |
730 | if (channel->monitor) { |
731 | uatomic_inc(&new_stream->chan->refcount); | |
732 | } | |
9d9353f9 | 733 | |
fb3a43a9 DG |
734 | /* |
735 | * The buffer flush is done on the session daemon side for the kernel | |
736 | * so no need for the stream "hangup_flush_done" variable to be | |
737 | * tracked. This is important for a kernel stream since we don't rely | |
738 | * on the flush state of the stream to read data. It's not the case for | |
739 | * user space tracing. | |
740 | */ | |
741 | new_stream->hangup_flush_done = 0; | |
742 | ||
9ce5646a MD |
743 | health_code_update(); |
744 | ||
d2956687 | 745 | pthread_mutex_lock(&new_stream->lock); |
633d0084 | 746 | if (ctx->on_recv_stream) { |
0c5b3718 SM |
747 | int ret_recv_stream = ctx->on_recv_stream(new_stream); |
748 | if (ret_recv_stream < 0) { | |
d2956687 JG |
749 | pthread_mutex_unlock(&new_stream->lock); |
750 | pthread_mutex_unlock(&channel->lock); | |
d771f832 | 751 | consumer_stream_free(new_stream); |
c5c7998f | 752 | goto error_add_stream_nosignal; |
fb3a43a9 | 753 | } |
633d0084 | 754 | } |
9ce5646a MD |
755 | health_code_update(); |
756 | ||
07b86b52 JD |
757 | if (new_stream->metadata_flag) { |
758 | channel->metadata_stream = new_stream; | |
759 | } | |
760 | ||
2bba9e53 DG |
761 | /* Do not monitor this stream. */ |
762 | if (!channel->monitor) { | |
5eecee74 | 763 | DBG("Kernel consumer add stream %s in no monitor mode with " |
6dc3064a | 764 | "relayd id %" PRIu64, new_stream->name, |
5eecee74 | 765 | new_stream->net_seq_idx); |
10a50311 | 766 | cds_list_add(&new_stream->send_node, &channel->streams.head); |
d2956687 JG |
767 | pthread_mutex_unlock(&new_stream->lock); |
768 | pthread_mutex_unlock(&channel->lock); | |
c5c7998f | 769 | goto end_add_stream; |
6dc3064a DG |
770 | } |
771 | ||
e1b71bdc DG |
772 | /* Send stream to relayd if the stream has an ID. */ |
773 | if (new_stream->net_seq_idx != (uint64_t) -1ULL) { | |
0c5b3718 SM |
774 | int ret_send_relayd_stream; |
775 | ||
776 | ret_send_relayd_stream = consumer_send_relayd_stream( | |
777 | new_stream, new_stream->chan->pathname); | |
778 | if (ret_send_relayd_stream < 0) { | |
d2956687 JG |
779 | pthread_mutex_unlock(&new_stream->lock); |
780 | pthread_mutex_unlock(&channel->lock); | |
e1b71bdc | 781 | consumer_stream_free(new_stream); |
c5c7998f | 782 | goto error_add_stream_nosignal; |
e1b71bdc | 783 | } |
001b7e62 MD |
784 | |
785 | /* | |
786 | * If adding an extra stream to an already | |
787 | * existing channel (e.g. cpu hotplug), we need | |
788 | * to send the "streams_sent" command to relayd. | |
789 | */ | |
790 | if (channel->streams_sent_to_relayd) { | |
0c5b3718 SM |
791 | int ret_send_relayd_streams_sent; |
792 | ||
793 | ret_send_relayd_streams_sent = | |
794 | consumer_send_relayd_streams_sent( | |
795 | new_stream->net_seq_idx); | |
796 | if (ret_send_relayd_streams_sent < 0) { | |
d2956687 JG |
797 | pthread_mutex_unlock(&new_stream->lock); |
798 | pthread_mutex_unlock(&channel->lock); | |
c5c7998f | 799 | goto error_add_stream_nosignal; |
001b7e62 MD |
800 | } |
801 | } | |
e2039c7a | 802 | } |
d2956687 JG |
803 | pthread_mutex_unlock(&new_stream->lock); |
804 | pthread_mutex_unlock(&channel->lock); | |
e2039c7a | 805 | |
50f8ae69 | 806 | /* Get the right pipe where the stream will be sent. */ |
633d0084 | 807 | if (new_stream->metadata_flag) { |
66d583dc | 808 | consumer_add_metadata_stream(new_stream); |
dae10966 | 809 | stream_pipe = ctx->consumer_metadata_pipe; |
3bd1e081 | 810 | } else { |
66d583dc | 811 | consumer_add_data_stream(new_stream); |
dae10966 | 812 | stream_pipe = ctx->consumer_data_pipe; |
50f8ae69 DG |
813 | } |
814 | ||
66d583dc | 815 | /* Visible to other threads */ |
5ab66908 MD |
816 | new_stream->globally_visible = 1; |
817 | ||
9ce5646a MD |
818 | health_code_update(); |
819 | ||
0c5b3718 SM |
820 | ret_pipe_write = lttng_pipe_write( |
821 | stream_pipe, &new_stream, sizeof(new_stream)); | |
822 | if (ret_pipe_write < 0) { | |
dae10966 | 823 | ERR("Consumer write %s stream to pipe %d", |
50f8ae69 | 824 | new_stream->metadata_flag ? "metadata" : "data", |
dae10966 | 825 | lttng_pipe_get_writefd(stream_pipe)); |
5ab66908 MD |
826 | if (new_stream->metadata_flag) { |
827 | consumer_del_stream_for_metadata(new_stream); | |
828 | } else { | |
829 | consumer_del_stream_for_data(new_stream); | |
830 | } | |
c5c7998f | 831 | goto error_add_stream_nosignal; |
3bd1e081 | 832 | } |
00e2e675 | 833 | |
02d02e31 JD |
834 | DBG("Kernel consumer ADD_STREAM %s (fd: %d) %s with relayd id %" PRIu64, |
835 | new_stream->name, fd, new_stream->chan->pathname, new_stream->relayd_stream_id); | |
c5c7998f | 836 | end_add_stream: |
3bd1e081 | 837 | break; |
c5c7998f JG |
838 | error_add_stream_nosignal: |
839 | goto end_nosignal; | |
840 | error_add_stream_fatal: | |
841 | goto error_fatal; | |
3bd1e081 | 842 | } |
a4baae1b JD |
843 | case LTTNG_CONSUMER_STREAMS_SENT: |
844 | { | |
845 | struct lttng_consumer_channel *channel; | |
0c5b3718 | 846 | int ret_send_status; |
a4baae1b JD |
847 | |
848 | /* | |
849 | * Get stream's channel reference. Needed when adding the stream to the | |
850 | * global hash table. | |
851 | */ | |
852 | channel = consumer_find_channel(msg.u.sent_streams.channel_key); | |
853 | if (!channel) { | |
854 | /* | |
855 | * We could not find the channel. Can happen if cpu hotplug | |
856 | * happens while tearing down. | |
857 | */ | |
858 | ERR("Unable to find channel key %" PRIu64, | |
859 | msg.u.sent_streams.channel_key); | |
e462382a | 860 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
a4baae1b JD |
861 | } |
862 | ||
863 | health_code_update(); | |
864 | ||
865 | /* | |
866 | * Send status code to session daemon. | |
867 | */ | |
0c5b3718 SM |
868 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
869 | if (ret_send_status < 0 || | |
870 | ret_code != LTTCOMM_CONSUMERD_SUCCESS) { | |
a4baae1b | 871 | /* Somehow, the session daemon is not responding anymore. */ |
80d5a658 | 872 | goto error_streams_sent_nosignal; |
a4baae1b JD |
873 | } |
874 | ||
875 | health_code_update(); | |
876 | ||
877 | /* | |
878 | * We should not send this message if we don't monitor the | |
879 | * streams in this channel. | |
880 | */ | |
881 | if (!channel->monitor) { | |
80d5a658 | 882 | goto end_error_streams_sent; |
a4baae1b JD |
883 | } |
884 | ||
885 | health_code_update(); | |
886 | /* Send stream to relayd if the stream has an ID. */ | |
887 | if (msg.u.sent_streams.net_seq_idx != (uint64_t) -1ULL) { | |
0c5b3718 SM |
888 | int ret_send_relay_streams; |
889 | ||
890 | ret_send_relay_streams = consumer_send_relayd_streams_sent( | |
a4baae1b | 891 | msg.u.sent_streams.net_seq_idx); |
0c5b3718 | 892 | if (ret_send_relay_streams < 0) { |
80d5a658 | 893 | goto error_streams_sent_nosignal; |
a4baae1b | 894 | } |
001b7e62 | 895 | channel->streams_sent_to_relayd = true; |
a4baae1b | 896 | } |
80d5a658 | 897 | end_error_streams_sent: |
a4baae1b | 898 | break; |
80d5a658 JG |
899 | error_streams_sent_nosignal: |
900 | goto end_nosignal; | |
a4baae1b | 901 | } |
3bd1e081 MD |
902 | case LTTNG_CONSUMER_UPDATE_STREAM: |
903 | { | |
3f8e211f DG |
904 | rcu_read_unlock(); |
905 | return -ENOSYS; | |
906 | } | |
907 | case LTTNG_CONSUMER_DESTROY_RELAYD: | |
908 | { | |
a6ba4fe1 | 909 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
3f8e211f | 910 | struct consumer_relayd_sock_pair *relayd; |
0c5b3718 | 911 | int ret_send_status; |
3f8e211f | 912 | |
a6ba4fe1 | 913 | DBG("Kernel consumer destroying relayd %" PRIu64, index); |
3f8e211f DG |
914 | |
915 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 916 | relayd = consumer_find_relayd(index); |
3f8e211f | 917 | if (relayd == NULL) { |
3448e266 | 918 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 919 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
3bd1e081 | 920 | } |
3f8e211f | 921 | |
a6ba4fe1 DG |
922 | /* |
923 | * Each relayd socket pair has a refcount of stream attached to it | |
924 | * which tells if the relayd is still active or not depending on the | |
925 | * refcount value. | |
926 | * | |
927 | * This will set the destroy flag of the relayd object and destroy it | |
928 | * if the refcount reaches zero when called. | |
929 | * | |
930 | * The destroy can happen either here or when a stream fd hangs up. | |
931 | */ | |
f50f23d9 DG |
932 | if (relayd) { |
933 | consumer_flag_relayd_for_destroy(relayd); | |
934 | } | |
935 | ||
9ce5646a MD |
936 | health_code_update(); |
937 | ||
0c5b3718 SM |
938 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
939 | if (ret_send_status < 0) { | |
f50f23d9 | 940 | /* Somehow, the session daemon is not responding anymore. */ |
1803a064 | 941 | goto error_fatal; |
f50f23d9 | 942 | } |
3f8e211f | 943 | |
3f8e211f | 944 | goto end_nosignal; |
3bd1e081 | 945 | } |
6d805429 | 946 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 947 | { |
0c5b3718 | 948 | int32_t ret_data_pending; |
6d805429 | 949 | uint64_t id = msg.u.data_pending.session_id; |
0c5b3718 | 950 | ssize_t ret_send; |
c8f59ee5 | 951 | |
6d805429 | 952 | DBG("Kernel consumer data pending command for id %" PRIu64, id); |
c8f59ee5 | 953 | |
0c5b3718 | 954 | ret_data_pending = consumer_data_pending(id); |
c8f59ee5 | 955 | |
9ce5646a MD |
956 | health_code_update(); |
957 | ||
c8f59ee5 | 958 | /* Send back returned value to session daemon */ |
0c5b3718 SM |
959 | ret_send = lttcomm_send_unix_sock(sock, &ret_data_pending, |
960 | sizeof(ret_data_pending)); | |
961 | if (ret_send < 0) { | |
6d805429 | 962 | PERROR("send data pending ret code"); |
1803a064 | 963 | goto error_fatal; |
c8f59ee5 | 964 | } |
f50f23d9 DG |
965 | |
966 | /* | |
967 | * No need to send back a status message since the data pending | |
968 | * returned value is the response. | |
969 | */ | |
c8f59ee5 | 970 | break; |
53632229 | 971 | } |
6dc3064a DG |
972 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
973 | { | |
3eb928aa MD |
974 | struct lttng_consumer_channel *channel; |
975 | uint64_t key = msg.u.snapshot_channel.key; | |
0c5b3718 | 976 | int ret_send_status; |
3eb928aa MD |
977 | |
978 | channel = consumer_find_channel(key); | |
979 | if (!channel) { | |
980 | ERR("Channel %" PRIu64 " not found", key); | |
981 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
07b86b52 | 982 | } else { |
3eb928aa | 983 | if (msg.u.snapshot_channel.metadata == 1) { |
0c5b3718 SM |
984 | int ret_snapshot; |
985 | ||
986 | ret_snapshot = lttng_kconsumer_snapshot_metadata( | |
987 | channel, key, | |
3eb928aa | 988 | msg.u.snapshot_channel.pathname, |
0c5b3718 SM |
989 | msg.u.snapshot_channel.relayd_id, |
990 | ctx); | |
991 | if (ret_snapshot < 0) { | |
3eb928aa MD |
992 | ERR("Snapshot metadata failed"); |
993 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
994 | } | |
995 | } else { | |
0c5b3718 SM |
996 | int ret_snapshot; |
997 | ||
998 | ret_snapshot = lttng_kconsumer_snapshot_channel( | |
999 | channel, key, | |
3eb928aa MD |
1000 | msg.u.snapshot_channel.pathname, |
1001 | msg.u.snapshot_channel.relayd_id, | |
0c5b3718 | 1002 | msg.u.snapshot_channel |
f46376a1 | 1003 | .nb_packets_per_stream); |
0c5b3718 | 1004 | if (ret_snapshot < 0) { |
3eb928aa MD |
1005 | ERR("Snapshot channel failed"); |
1006 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
1007 | } | |
07b86b52 JD |
1008 | } |
1009 | } | |
9ce5646a MD |
1010 | health_code_update(); |
1011 | ||
0c5b3718 SM |
1012 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
1013 | if (ret_send_status < 0) { | |
6dc3064a DG |
1014 | /* Somehow, the session daemon is not responding anymore. */ |
1015 | goto end_nosignal; | |
1016 | } | |
1017 | break; | |
1018 | } | |
07b86b52 JD |
1019 | case LTTNG_CONSUMER_DESTROY_CHANNEL: |
1020 | { | |
1021 | uint64_t key = msg.u.destroy_channel.key; | |
1022 | struct lttng_consumer_channel *channel; | |
0c5b3718 | 1023 | int ret_send_status; |
07b86b52 JD |
1024 | |
1025 | channel = consumer_find_channel(key); | |
1026 | if (!channel) { | |
1027 | ERR("Kernel consumer destroy channel %" PRIu64 " not found", key); | |
e462382a | 1028 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
07b86b52 JD |
1029 | } |
1030 | ||
9ce5646a MD |
1031 | health_code_update(); |
1032 | ||
0c5b3718 SM |
1033 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
1034 | if (ret_send_status < 0) { | |
07b86b52 | 1035 | /* Somehow, the session daemon is not responding anymore. */ |
a9d36096 | 1036 | goto end_destroy_channel; |
07b86b52 JD |
1037 | } |
1038 | ||
9ce5646a MD |
1039 | health_code_update(); |
1040 | ||
15dc512a DG |
1041 | /* Stop right now if no channel was found. */ |
1042 | if (!channel) { | |
a9d36096 | 1043 | goto end_destroy_channel; |
15dc512a DG |
1044 | } |
1045 | ||
07b86b52 JD |
1046 | /* |
1047 | * This command should ONLY be issued for channel with streams set in | |
1048 | * no monitor mode. | |
1049 | */ | |
a0377dfe | 1050 | LTTNG_ASSERT(!channel->monitor); |
07b86b52 JD |
1051 | |
1052 | /* | |
1053 | * The refcount should ALWAYS be 0 in the case of a channel in no | |
1054 | * monitor mode. | |
1055 | */ | |
a0377dfe | 1056 | LTTNG_ASSERT(!uatomic_sub_return(&channel->refcount, 1)); |
07b86b52 JD |
1057 | |
1058 | consumer_del_channel(channel); | |
a9d36096 | 1059 | end_destroy_channel: |
07b86b52 JD |
1060 | goto end_nosignal; |
1061 | } | |
fb83fe64 JD |
1062 | case LTTNG_CONSUMER_DISCARDED_EVENTS: |
1063 | { | |
66ab32be JD |
1064 | ssize_t ret; |
1065 | uint64_t count; | |
fb83fe64 JD |
1066 | struct lttng_consumer_channel *channel; |
1067 | uint64_t id = msg.u.discarded_events.session_id; | |
1068 | uint64_t key = msg.u.discarded_events.channel_key; | |
1069 | ||
e5742757 MD |
1070 | DBG("Kernel consumer discarded events command for session id %" |
1071 | PRIu64 ", channel key %" PRIu64, id, key); | |
1072 | ||
fb83fe64 JD |
1073 | channel = consumer_find_channel(key); |
1074 | if (!channel) { | |
1075 | ERR("Kernel consumer discarded events channel %" | |
1076 | PRIu64 " not found", key); | |
66ab32be | 1077 | count = 0; |
e5742757 | 1078 | } else { |
66ab32be | 1079 | count = channel->discarded_events; |
fb83fe64 JD |
1080 | } |
1081 | ||
fb83fe64 JD |
1082 | health_code_update(); |
1083 | ||
1084 | /* Send back returned value to session daemon */ | |
66ab32be | 1085 | ret = lttcomm_send_unix_sock(sock, &count, sizeof(count)); |
fb83fe64 JD |
1086 | if (ret < 0) { |
1087 | PERROR("send discarded events"); | |
1088 | goto error_fatal; | |
1089 | } | |
1090 | ||
1091 | break; | |
1092 | } | |
1093 | case LTTNG_CONSUMER_LOST_PACKETS: | |
1094 | { | |
66ab32be JD |
1095 | ssize_t ret; |
1096 | uint64_t count; | |
fb83fe64 JD |
1097 | struct lttng_consumer_channel *channel; |
1098 | uint64_t id = msg.u.lost_packets.session_id; | |
1099 | uint64_t key = msg.u.lost_packets.channel_key; | |
1100 | ||
e5742757 MD |
1101 | DBG("Kernel consumer lost packets command for session id %" |
1102 | PRIu64 ", channel key %" PRIu64, id, key); | |
1103 | ||
fb83fe64 JD |
1104 | channel = consumer_find_channel(key); |
1105 | if (!channel) { | |
1106 | ERR("Kernel consumer lost packets channel %" | |
1107 | PRIu64 " not found", key); | |
66ab32be | 1108 | count = 0; |
e5742757 | 1109 | } else { |
66ab32be | 1110 | count = channel->lost_packets; |
fb83fe64 JD |
1111 | } |
1112 | ||
fb83fe64 JD |
1113 | health_code_update(); |
1114 | ||
1115 | /* Send back returned value to session daemon */ | |
66ab32be | 1116 | ret = lttcomm_send_unix_sock(sock, &count, sizeof(count)); |
fb83fe64 JD |
1117 | if (ret < 0) { |
1118 | PERROR("send lost packets"); | |
1119 | goto error_fatal; | |
1120 | } | |
1121 | ||
1122 | break; | |
1123 | } | |
b3530820 JG |
1124 | case LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE: |
1125 | { | |
1126 | int channel_monitor_pipe; | |
0c5b3718 SM |
1127 | int ret_send_status, ret_set_channel_monitor_pipe; |
1128 | ssize_t ret_recv; | |
b3530820 JG |
1129 | |
1130 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1131 | /* Successfully received the command's type. */ | |
0c5b3718 SM |
1132 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
1133 | if (ret_send_status < 0) { | |
b3530820 JG |
1134 | goto error_fatal; |
1135 | } | |
1136 | ||
0c5b3718 SM |
1137 | ret_recv = lttcomm_recv_fds_unix_sock( |
1138 | sock, &channel_monitor_pipe, 1); | |
1139 | if (ret_recv != sizeof(channel_monitor_pipe)) { | |
b3530820 JG |
1140 | ERR("Failed to receive channel monitor pipe"); |
1141 | goto error_fatal; | |
1142 | } | |
1143 | ||
1144 | DBG("Received channel monitor pipe (%d)", channel_monitor_pipe); | |
0c5b3718 SM |
1145 | ret_set_channel_monitor_pipe = |
1146 | consumer_timer_thread_set_channel_monitor_pipe( | |
1147 | channel_monitor_pipe); | |
1148 | if (!ret_set_channel_monitor_pipe) { | |
b3530820 | 1149 | int flags; |
0c5b3718 | 1150 | int ret_fcntl; |
b3530820 JG |
1151 | |
1152 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1153 | /* Set the pipe as non-blocking. */ | |
0c5b3718 SM |
1154 | ret_fcntl = fcntl(channel_monitor_pipe, F_GETFL, 0); |
1155 | if (ret_fcntl == -1) { | |
b3530820 JG |
1156 | PERROR("fcntl get flags of the channel monitoring pipe"); |
1157 | goto error_fatal; | |
1158 | } | |
0c5b3718 | 1159 | flags = ret_fcntl; |
b3530820 | 1160 | |
0c5b3718 | 1161 | ret_fcntl = fcntl(channel_monitor_pipe, F_SETFL, |
b3530820 | 1162 | flags | O_NONBLOCK); |
0c5b3718 | 1163 | if (ret_fcntl == -1) { |
b3530820 JG |
1164 | PERROR("fcntl set O_NONBLOCK flag of the channel monitoring pipe"); |
1165 | goto error_fatal; | |
1166 | } | |
1167 | DBG("Channel monitor pipe set as non-blocking"); | |
1168 | } else { | |
1169 | ret_code = LTTCOMM_CONSUMERD_ALREADY_SET; | |
1170 | } | |
0c5b3718 SM |
1171 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
1172 | if (ret_send_status < 0) { | |
b3530820 JG |
1173 | goto error_fatal; |
1174 | } | |
1175 | break; | |
1176 | } | |
b99a8d42 JD |
1177 | case LTTNG_CONSUMER_ROTATE_CHANNEL: |
1178 | { | |
92b7a7f8 MD |
1179 | struct lttng_consumer_channel *channel; |
1180 | uint64_t key = msg.u.rotate_channel.key; | |
0c5b3718 | 1181 | int ret_send_status; |
b99a8d42 | 1182 | |
92b7a7f8 | 1183 | DBG("Consumer rotate channel %" PRIu64, key); |
b99a8d42 | 1184 | |
92b7a7f8 MD |
1185 | channel = consumer_find_channel(key); |
1186 | if (!channel) { | |
1187 | ERR("Channel %" PRIu64 " not found", key); | |
1188 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
1189 | } else { | |
1190 | /* | |
1191 | * Sample the rotate position of all the streams in this channel. | |
1192 | */ | |
0c5b3718 SM |
1193 | int ret_rotate_channel; |
1194 | ||
1195 | ret_rotate_channel = lttng_consumer_rotate_channel( | |
1196 | channel, key, | |
f46376a1 | 1197 | msg.u.rotate_channel.relayd_id); |
0c5b3718 | 1198 | if (ret_rotate_channel < 0) { |
92b7a7f8 MD |
1199 | ERR("Rotate channel failed"); |
1200 | ret_code = LTTCOMM_CONSUMERD_ROTATION_FAIL; | |
1201 | } | |
b99a8d42 | 1202 | |
92b7a7f8 MD |
1203 | health_code_update(); |
1204 | } | |
0c5b3718 SM |
1205 | |
1206 | ret_send_status = consumer_send_status_msg(sock, ret_code); | |
1207 | if (ret_send_status < 0) { | |
b99a8d42 | 1208 | /* Somehow, the session daemon is not responding anymore. */ |
713bdd26 | 1209 | goto error_rotate_channel; |
b99a8d42 | 1210 | } |
92b7a7f8 MD |
1211 | if (channel) { |
1212 | /* Rotate the streams that are ready right now. */ | |
0c5b3718 SM |
1213 | int ret_rotate; |
1214 | ||
1215 | ret_rotate = lttng_consumer_rotate_ready_streams( | |
f46376a1 | 1216 | channel, key); |
0c5b3718 | 1217 | if (ret_rotate < 0) { |
92b7a7f8 MD |
1218 | ERR("Rotate ready streams failed"); |
1219 | } | |
b99a8d42 | 1220 | } |
b99a8d42 | 1221 | break; |
713bdd26 JG |
1222 | error_rotate_channel: |
1223 | goto end_nosignal; | |
b99a8d42 | 1224 | } |
5f3aff8b MD |
1225 | case LTTNG_CONSUMER_CLEAR_CHANNEL: |
1226 | { | |
1227 | struct lttng_consumer_channel *channel; | |
1228 | uint64_t key = msg.u.clear_channel.key; | |
0c5b3718 | 1229 | int ret_send_status; |
5f3aff8b MD |
1230 | |
1231 | channel = consumer_find_channel(key); | |
1232 | if (!channel) { | |
1233 | DBG("Channel %" PRIu64 " not found", key); | |
1234 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
1235 | } else { | |
0c5b3718 SM |
1236 | int ret_clear_channel; |
1237 | ||
1238 | ret_clear_channel = | |
1239 | lttng_consumer_clear_channel(channel); | |
1240 | if (ret_clear_channel) { | |
5f3aff8b | 1241 | ERR("Clear channel failed"); |
97535efa | 1242 | ret_code = (lttcomm_return_code) ret_clear_channel; |
5f3aff8b MD |
1243 | } |
1244 | ||
1245 | health_code_update(); | |
1246 | } | |
0c5b3718 SM |
1247 | |
1248 | ret_send_status = consumer_send_status_msg(sock, ret_code); | |
1249 | if (ret_send_status < 0) { | |
5f3aff8b MD |
1250 | /* Somehow, the session daemon is not responding anymore. */ |
1251 | goto end_nosignal; | |
1252 | } | |
1253 | ||
1254 | break; | |
1255 | } | |
d2956687 | 1256 | case LTTNG_CONSUMER_INIT: |
00fb02ac | 1257 | { |
0c5b3718 | 1258 | int ret_send_status; |
328c2fe7 JG |
1259 | lttng_uuid sessiond_uuid; |
1260 | ||
1261 | std::copy(std::begin(msg.u.init.sessiond_uuid), std::end(msg.u.init.sessiond_uuid), | |
1262 | sessiond_uuid.begin()); | |
0c5b3718 | 1263 | |
d2956687 | 1264 | ret_code = lttng_consumer_init_command(ctx, |
328c2fe7 | 1265 | sessiond_uuid); |
00fb02ac | 1266 | health_code_update(); |
0c5b3718 SM |
1267 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
1268 | if (ret_send_status < 0) { | |
00fb02ac JD |
1269 | /* Somehow, the session daemon is not responding anymore. */ |
1270 | goto end_nosignal; | |
1271 | } | |
1272 | break; | |
1273 | } | |
d2956687 | 1274 | case LTTNG_CONSUMER_CREATE_TRACE_CHUNK: |
d88744a4 | 1275 | { |
d2956687 | 1276 | const struct lttng_credentials credentials = { |
ff588497 JR |
1277 | .uid = LTTNG_OPTIONAL_INIT_VALUE(msg.u.create_trace_chunk.credentials.value.uid), |
1278 | .gid = LTTNG_OPTIONAL_INIT_VALUE(msg.u.create_trace_chunk.credentials.value.gid), | |
d2956687 JG |
1279 | }; |
1280 | const bool is_local_trace = | |
1281 | !msg.u.create_trace_chunk.relayd_id.is_set; | |
1282 | const uint64_t relayd_id = | |
1283 | msg.u.create_trace_chunk.relayd_id.value; | |
1284 | const char *chunk_override_name = | |
1285 | *msg.u.create_trace_chunk.override_name ? | |
1286 | msg.u.create_trace_chunk.override_name : | |
1287 | NULL; | |
cbf53d23 | 1288 | struct lttng_directory_handle *chunk_directory_handle = NULL; |
d88744a4 | 1289 | |
d2956687 JG |
1290 | /* |
1291 | * The session daemon will only provide a chunk directory file | |
1292 | * descriptor for local traces. | |
1293 | */ | |
1294 | if (is_local_trace) { | |
1295 | int chunk_dirfd; | |
0c5b3718 SM |
1296 | int ret_send_status; |
1297 | ssize_t ret_recv; | |
19990ed5 | 1298 | |
d2956687 | 1299 | /* Acnowledge the reception of the command. */ |
0c5b3718 SM |
1300 | ret_send_status = consumer_send_status_msg( |
1301 | sock, LTTCOMM_CONSUMERD_SUCCESS); | |
1302 | if (ret_send_status < 0) { | |
d2956687 JG |
1303 | /* Somehow, the session daemon is not responding anymore. */ |
1304 | goto end_nosignal; | |
1305 | } | |
92816cc3 | 1306 | |
0c5b3718 SM |
1307 | ret_recv = lttcomm_recv_fds_unix_sock( |
1308 | sock, &chunk_dirfd, 1); | |
1309 | if (ret_recv != sizeof(chunk_dirfd)) { | |
d2956687 JG |
1310 | ERR("Failed to receive trace chunk directory file descriptor"); |
1311 | goto error_fatal; | |
1312 | } | |
92816cc3 | 1313 | |
d2956687 JG |
1314 | DBG("Received trace chunk directory fd (%d)", |
1315 | chunk_dirfd); | |
cbf53d23 | 1316 | chunk_directory_handle = lttng_directory_handle_create_from_dirfd( |
d2956687 | 1317 | chunk_dirfd); |
cbf53d23 | 1318 | if (!chunk_directory_handle) { |
d2956687 JG |
1319 | ERR("Failed to initialize chunk directory handle from directory file descriptor"); |
1320 | if (close(chunk_dirfd)) { | |
1321 | PERROR("Failed to close chunk directory file descriptor"); | |
1322 | } | |
1323 | goto error_fatal; | |
1324 | } | |
92816cc3 JG |
1325 | } |
1326 | ||
d2956687 JG |
1327 | ret_code = lttng_consumer_create_trace_chunk( |
1328 | !is_local_trace ? &relayd_id : NULL, | |
1329 | msg.u.create_trace_chunk.session_id, | |
1330 | msg.u.create_trace_chunk.chunk_id, | |
e5add6d0 JG |
1331 | (time_t) msg.u.create_trace_chunk |
1332 | .creation_timestamp, | |
d2956687 | 1333 | chunk_override_name, |
e5add6d0 JG |
1334 | msg.u.create_trace_chunk.credentials.is_set ? |
1335 | &credentials : | |
1336 | NULL, | |
cbf53d23 JG |
1337 | chunk_directory_handle); |
1338 | lttng_directory_handle_put(chunk_directory_handle); | |
d2956687 | 1339 | goto end_msg_sessiond; |
d88744a4 | 1340 | } |
d2956687 | 1341 | case LTTNG_CONSUMER_CLOSE_TRACE_CHUNK: |
a1ae2ea5 | 1342 | { |
bbc4768c | 1343 | enum lttng_trace_chunk_command_type close_command = |
97535efa | 1344 | (lttng_trace_chunk_command_type) msg.u.close_trace_chunk.close_command.value; |
d2956687 JG |
1345 | const uint64_t relayd_id = |
1346 | msg.u.close_trace_chunk.relayd_id.value; | |
ecd1a12f MD |
1347 | struct lttcomm_consumer_close_trace_chunk_reply reply; |
1348 | char path[LTTNG_PATH_MAX]; | |
0c5b3718 | 1349 | ssize_t ret_send; |
d2956687 JG |
1350 | |
1351 | ret_code = lttng_consumer_close_trace_chunk( | |
1352 | msg.u.close_trace_chunk.relayd_id.is_set ? | |
bbc4768c JG |
1353 | &relayd_id : |
1354 | NULL, | |
d2956687 JG |
1355 | msg.u.close_trace_chunk.session_id, |
1356 | msg.u.close_trace_chunk.chunk_id, | |
bbc4768c JG |
1357 | (time_t) msg.u.close_trace_chunk.close_timestamp, |
1358 | msg.u.close_trace_chunk.close_command.is_set ? | |
1359 | &close_command : | |
ecd1a12f MD |
1360 | NULL, path); |
1361 | reply.ret_code = ret_code; | |
1362 | reply.path_length = strlen(path) + 1; | |
0c5b3718 SM |
1363 | ret_send = lttcomm_send_unix_sock(sock, &reply, sizeof(reply)); |
1364 | if (ret_send != sizeof(reply)) { | |
ecd1a12f MD |
1365 | goto error_fatal; |
1366 | } | |
0c5b3718 SM |
1367 | ret_send = lttcomm_send_unix_sock( |
1368 | sock, path, reply.path_length); | |
1369 | if (ret_send != reply.path_length) { | |
ecd1a12f MD |
1370 | goto error_fatal; |
1371 | } | |
1372 | goto end_nosignal; | |
3654ed19 | 1373 | } |
d2956687 | 1374 | case LTTNG_CONSUMER_TRACE_CHUNK_EXISTS: |
3654ed19 | 1375 | { |
d2956687 JG |
1376 | const uint64_t relayd_id = |
1377 | msg.u.trace_chunk_exists.relayd_id.value; | |
1378 | ||
1379 | ret_code = lttng_consumer_trace_chunk_exists( | |
1380 | msg.u.trace_chunk_exists.relayd_id.is_set ? | |
1381 | &relayd_id : NULL, | |
1382 | msg.u.trace_chunk_exists.session_id, | |
1383 | msg.u.trace_chunk_exists.chunk_id); | |
1384 | goto end_msg_sessiond; | |
a1ae2ea5 | 1385 | } |
04ed9e10 JG |
1386 | case LTTNG_CONSUMER_OPEN_CHANNEL_PACKETS: |
1387 | { | |
1388 | const uint64_t key = msg.u.open_channel_packets.key; | |
1389 | struct lttng_consumer_channel *channel = | |
1390 | consumer_find_channel(key); | |
1391 | ||
1392 | if (channel) { | |
1393 | pthread_mutex_lock(&channel->lock); | |
1394 | ret_code = lttng_consumer_open_channel_packets(channel); | |
1395 | pthread_mutex_unlock(&channel->lock); | |
1396 | } else { | |
1397 | WARN("Channel %" PRIu64 " not found", key); | |
1398 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
1399 | } | |
1400 | ||
1401 | health_code_update(); | |
1402 | goto end_msg_sessiond; | |
1403 | } | |
3bd1e081 | 1404 | default: |
3f8e211f | 1405 | goto end_nosignal; |
3bd1e081 | 1406 | } |
3f8e211f | 1407 | |
3bd1e081 | 1408 | end_nosignal: |
4cbc1a04 DG |
1409 | /* |
1410 | * Return 1 to indicate success since the 0 value can be a socket | |
1411 | * shutdown during the recv() or send() call. | |
1412 | */ | |
0c5b3718 | 1413 | ret_func = 1; |
c5c7998f JG |
1414 | goto end; |
1415 | error_fatal: | |
1416 | /* This will issue a consumer stop. */ | |
0c5b3718 | 1417 | ret_func = -1; |
c5c7998f | 1418 | goto end; |
d2956687 JG |
1419 | end_msg_sessiond: |
1420 | /* | |
1421 | * The returned value here is not useful since either way we'll return 1 to | |
1422 | * the caller because the session daemon socket management is done | |
1423 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. | |
1424 | */ | |
0c5b3718 SM |
1425 | { |
1426 | int ret_send_status; | |
1427 | ||
1428 | ret_send_status = consumer_send_status_msg(sock, ret_code); | |
1429 | if (ret_send_status < 0) { | |
1430 | goto error_fatal; | |
1431 | } | |
d2956687 | 1432 | } |
0c5b3718 SM |
1433 | |
1434 | ret_func = 1; | |
1435 | ||
c5c7998f | 1436 | end: |
d2956687 | 1437 | health_code_update(); |
1803a064 | 1438 | rcu_read_unlock(); |
0c5b3718 | 1439 | return ret_func; |
3bd1e081 | 1440 | } |
d41f73b7 | 1441 | |
94d49140 JD |
1442 | /* |
1443 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
1444 | * metadata thread can consumer them. | |
1445 | * | |
1446 | * Metadata stream lock MUST be acquired. | |
94d49140 | 1447 | */ |
577eea73 JG |
1448 | enum sync_metadata_status lttng_kconsumer_sync_metadata( |
1449 | struct lttng_consumer_stream *metadata) | |
94d49140 JD |
1450 | { |
1451 | int ret; | |
577eea73 | 1452 | enum sync_metadata_status status; |
94d49140 | 1453 | |
a0377dfe | 1454 | LTTNG_ASSERT(metadata); |
94d49140 JD |
1455 | |
1456 | ret = kernctl_buffer_flush(metadata->wait_fd); | |
1457 | if (ret < 0) { | |
1458 | ERR("Failed to flush kernel stream"); | |
577eea73 | 1459 | status = SYNC_METADATA_STATUS_ERROR; |
94d49140 JD |
1460 | goto end; |
1461 | } | |
1462 | ||
1463 | ret = kernctl_snapshot(metadata->wait_fd); | |
1464 | if (ret < 0) { | |
577eea73 JG |
1465 | if (errno == EAGAIN) { |
1466 | /* No new metadata, exit. */ | |
1467 | DBG("Sync metadata, no new kernel metadata"); | |
1468 | status = SYNC_METADATA_STATUS_NO_DATA; | |
1469 | } else { | |
94d49140 | 1470 | ERR("Sync metadata, taking kernel snapshot failed."); |
577eea73 | 1471 | status = SYNC_METADATA_STATUS_ERROR; |
94d49140 | 1472 | } |
577eea73 JG |
1473 | } else { |
1474 | status = SYNC_METADATA_STATUS_NEW_DATA; | |
94d49140 JD |
1475 | } |
1476 | ||
1477 | end: | |
577eea73 | 1478 | return status; |
94d49140 | 1479 | } |
309167d2 | 1480 | |
fb83fe64 | 1481 | static |
6f9449c2 JG |
1482 | int extract_common_subbuffer_info(struct lttng_consumer_stream *stream, |
1483 | struct stream_subbuffer *subbuf) | |
fb83fe64 JD |
1484 | { |
1485 | int ret; | |
fb83fe64 | 1486 | |
6f9449c2 JG |
1487 | ret = kernctl_get_subbuf_size( |
1488 | stream->wait_fd, &subbuf->info.data.subbuf_size); | |
1489 | if (ret) { | |
fb83fe64 JD |
1490 | goto end; |
1491 | } | |
fb83fe64 | 1492 | |
6f9449c2 JG |
1493 | ret = kernctl_get_padded_subbuf_size( |
1494 | stream->wait_fd, &subbuf->info.data.padded_subbuf_size); | |
1495 | if (ret) { | |
fb83fe64 JD |
1496 | goto end; |
1497 | } | |
fb83fe64 JD |
1498 | |
1499 | end: | |
1500 | return ret; | |
1501 | } | |
1502 | ||
93ec662e | 1503 | static |
6f9449c2 JG |
1504 | int extract_metadata_subbuffer_info(struct lttng_consumer_stream *stream, |
1505 | struct stream_subbuffer *subbuf) | |
93ec662e JD |
1506 | { |
1507 | int ret; | |
93ec662e | 1508 | |
6f9449c2 JG |
1509 | ret = extract_common_subbuffer_info(stream, subbuf); |
1510 | if (ret) { | |
93ec662e JD |
1511 | goto end; |
1512 | } | |
1513 | ||
6f9449c2 JG |
1514 | ret = kernctl_get_metadata_version( |
1515 | stream->wait_fd, &subbuf->info.metadata.version); | |
1516 | if (ret) { | |
93ec662e JD |
1517 | goto end; |
1518 | } | |
1519 | ||
93ec662e JD |
1520 | end: |
1521 | return ret; | |
1522 | } | |
1523 | ||
6f9449c2 JG |
1524 | static |
1525 | int extract_data_subbuffer_info(struct lttng_consumer_stream *stream, | |
1526 | struct stream_subbuffer *subbuf) | |
d41f73b7 | 1527 | { |
6f9449c2 | 1528 | int ret; |
d41f73b7 | 1529 | |
6f9449c2 JG |
1530 | ret = extract_common_subbuffer_info(stream, subbuf); |
1531 | if (ret) { | |
1532 | goto end; | |
1533 | } | |
309167d2 | 1534 | |
6f9449c2 JG |
1535 | ret = kernctl_get_packet_size( |
1536 | stream->wait_fd, &subbuf->info.data.packet_size); | |
1537 | if (ret < 0) { | |
1538 | PERROR("Failed to get sub-buffer packet size"); | |
1539 | goto end; | |
1540 | } | |
02d02e31 | 1541 | |
6f9449c2 JG |
1542 | ret = kernctl_get_content_size( |
1543 | stream->wait_fd, &subbuf->info.data.content_size); | |
1544 | if (ret < 0) { | |
1545 | PERROR("Failed to get sub-buffer content size"); | |
1546 | goto end; | |
d41f73b7 MD |
1547 | } |
1548 | ||
6f9449c2 JG |
1549 | ret = kernctl_get_timestamp_begin( |
1550 | stream->wait_fd, &subbuf->info.data.timestamp_begin); | |
1551 | if (ret < 0) { | |
1552 | PERROR("Failed to get sub-buffer begin timestamp"); | |
1553 | goto end; | |
1d4dfdef DG |
1554 | } |
1555 | ||
6f9449c2 JG |
1556 | ret = kernctl_get_timestamp_end( |
1557 | stream->wait_fd, &subbuf->info.data.timestamp_end); | |
1558 | if (ret < 0) { | |
1559 | PERROR("Failed to get sub-buffer end timestamp"); | |
1560 | goto end; | |
1561 | } | |
1562 | ||
1563 | ret = kernctl_get_events_discarded( | |
1564 | stream->wait_fd, &subbuf->info.data.events_discarded); | |
1565 | if (ret) { | |
1566 | PERROR("Failed to get sub-buffer events discarded count"); | |
1567 | goto end; | |
1568 | } | |
1569 | ||
1570 | ret = kernctl_get_sequence_number(stream->wait_fd, | |
1571 | &subbuf->info.data.sequence_number.value); | |
1572 | if (ret) { | |
1573 | /* May not be supported by older LTTng-modules. */ | |
1574 | if (ret != -ENOTTY) { | |
1575 | PERROR("Failed to get sub-buffer sequence number"); | |
1576 | goto end; | |
fb83fe64 | 1577 | } |
1c20f0e2 | 1578 | } else { |
6f9449c2 | 1579 | subbuf->info.data.sequence_number.is_set = true; |
309167d2 JD |
1580 | } |
1581 | ||
6f9449c2 JG |
1582 | ret = kernctl_get_stream_id( |
1583 | stream->wait_fd, &subbuf->info.data.stream_id); | |
1584 | if (ret < 0) { | |
1585 | PERROR("Failed to get stream id"); | |
1586 | goto end; | |
1587 | } | |
1d4dfdef | 1588 | |
6f9449c2 JG |
1589 | ret = kernctl_get_instance_id(stream->wait_fd, |
1590 | &subbuf->info.data.stream_instance_id.value); | |
1591 | if (ret) { | |
1592 | /* May not be supported by older LTTng-modules. */ | |
1593 | if (ret != -ENOTTY) { | |
1594 | PERROR("Failed to get stream instance id"); | |
1595 | goto end; | |
1d4dfdef | 1596 | } |
6f9449c2 JG |
1597 | } else { |
1598 | subbuf->info.data.stream_instance_id.is_set = true; | |
1599 | } | |
1600 | end: | |
1601 | return ret; | |
1602 | } | |
47e81c02 | 1603 | |
6f9449c2 | 1604 | static |
b6797c8e JG |
1605 | enum get_next_subbuffer_status get_subbuffer_common( |
1606 | struct lttng_consumer_stream *stream, | |
6f9449c2 JG |
1607 | struct stream_subbuffer *subbuffer) |
1608 | { | |
1609 | int ret; | |
b6797c8e | 1610 | enum get_next_subbuffer_status status; |
6f9449c2 JG |
1611 | |
1612 | ret = kernctl_get_next_subbuf(stream->wait_fd); | |
b6797c8e JG |
1613 | switch (ret) { |
1614 | case 0: | |
1615 | status = GET_NEXT_SUBBUFFER_STATUS_OK; | |
1616 | break; | |
1617 | case -ENODATA: | |
1618 | case -EAGAIN: | |
6e5e3c51 MD |
1619 | /* |
1620 | * The caller only expects -ENODATA when there is no data to | |
1621 | * read, but the kernel tracer returns -EAGAIN when there is | |
1622 | * currently no data for a non-finalized stream, and -ENODATA | |
1623 | * when there is no data for a finalized stream. Those can be | |
1624 | * combined into a -ENODATA return value. | |
1625 | */ | |
b6797c8e JG |
1626 | status = GET_NEXT_SUBBUFFER_STATUS_NO_DATA; |
1627 | goto end; | |
1628 | default: | |
1629 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; | |
6f9449c2 JG |
1630 | goto end; |
1631 | } | |
1632 | ||
1633 | ret = stream->read_subbuffer_ops.extract_subbuffer_info( | |
b6797c8e JG |
1634 | stream, subbuffer); |
1635 | if (ret) { | |
1636 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; | |
1637 | } | |
6f9449c2 | 1638 | end: |
b6797c8e | 1639 | return status; |
6f9449c2 | 1640 | } |
128708c3 | 1641 | |
6f9449c2 | 1642 | static |
b6797c8e JG |
1643 | enum get_next_subbuffer_status get_next_subbuffer_splice( |
1644 | struct lttng_consumer_stream *stream, | |
6f9449c2 JG |
1645 | struct stream_subbuffer *subbuffer) |
1646 | { | |
b6797c8e JG |
1647 | const enum get_next_subbuffer_status status = |
1648 | get_subbuffer_common(stream, subbuffer); | |
1d4dfdef | 1649 | |
b6797c8e | 1650 | if (status != GET_NEXT_SUBBUFFER_STATUS_OK) { |
6f9449c2 JG |
1651 | goto end; |
1652 | } | |
1d4dfdef | 1653 | |
6f9449c2 JG |
1654 | subbuffer->buffer.fd = stream->wait_fd; |
1655 | end: | |
b6797c8e | 1656 | return status; |
6f9449c2 | 1657 | } |
fd424d99 | 1658 | |
6f9449c2 | 1659 | static |
b6797c8e JG |
1660 | enum get_next_subbuffer_status get_next_subbuffer_mmap( |
1661 | struct lttng_consumer_stream *stream, | |
6f9449c2 JG |
1662 | struct stream_subbuffer *subbuffer) |
1663 | { | |
1664 | int ret; | |
b6797c8e | 1665 | enum get_next_subbuffer_status status; |
6f9449c2 JG |
1666 | const char *addr; |
1667 | ||
b6797c8e JG |
1668 | status = get_subbuffer_common(stream, subbuffer); |
1669 | if (status != GET_NEXT_SUBBUFFER_STATUS_OK) { | |
6f9449c2 | 1670 | goto end; |
128708c3 | 1671 | } |
6f9449c2 JG |
1672 | |
1673 | ret = get_current_subbuf_addr(stream, &addr); | |
1674 | if (ret) { | |
b6797c8e | 1675 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; |
6f9449c2 | 1676 | goto end; |
d41f73b7 | 1677 | } |
6f9449c2 JG |
1678 | |
1679 | subbuffer->buffer.buffer = lttng_buffer_view_init( | |
1680 | addr, 0, subbuffer->info.data.padded_subbuf_size); | |
1681 | end: | |
b6797c8e | 1682 | return status; |
6f9449c2 JG |
1683 | } |
1684 | ||
f5ba75b4 | 1685 | static |
b6797c8e | 1686 | enum get_next_subbuffer_status get_next_subbuffer_metadata_check(struct lttng_consumer_stream *stream, |
f5ba75b4 JG |
1687 | struct stream_subbuffer *subbuffer) |
1688 | { | |
1689 | int ret; | |
1690 | const char *addr; | |
1691 | bool coherent; | |
b6797c8e | 1692 | enum get_next_subbuffer_status status; |
f5ba75b4 JG |
1693 | |
1694 | ret = kernctl_get_next_subbuf_metadata_check(stream->wait_fd, | |
1695 | &coherent); | |
1696 | if (ret) { | |
1697 | goto end; | |
1698 | } | |
1699 | ||
1700 | ret = stream->read_subbuffer_ops.extract_subbuffer_info( | |
1701 | stream, subbuffer); | |
1702 | if (ret) { | |
1703 | goto end; | |
1704 | } | |
1705 | ||
1706 | LTTNG_OPTIONAL_SET(&subbuffer->info.metadata.coherent, coherent); | |
1707 | ||
1708 | ret = get_current_subbuf_addr(stream, &addr); | |
1709 | if (ret) { | |
1710 | goto end; | |
1711 | } | |
1712 | ||
1713 | subbuffer->buffer.buffer = lttng_buffer_view_init( | |
1714 | addr, 0, subbuffer->info.data.padded_subbuf_size); | |
1715 | DBG("Got metadata packet with padded_subbuf_size = %lu, coherent = %s", | |
1716 | subbuffer->info.metadata.padded_subbuf_size, | |
1717 | coherent ? "true" : "false"); | |
1718 | end: | |
6e5e3c51 MD |
1719 | /* |
1720 | * The caller only expects -ENODATA when there is no data to read, but | |
1721 | * the kernel tracer returns -EAGAIN when there is currently no data | |
1722 | * for a non-finalized stream, and -ENODATA when there is no data for a | |
1723 | * finalized stream. Those can be combined into a -ENODATA return value. | |
1724 | */ | |
b6797c8e JG |
1725 | switch (ret) { |
1726 | case 0: | |
1727 | status = GET_NEXT_SUBBUFFER_STATUS_OK; | |
1728 | break; | |
1729 | case -ENODATA: | |
1730 | case -EAGAIN: | |
1731 | /* | |
1732 | * The caller only expects -ENODATA when there is no data to | |
1733 | * read, but the kernel tracer returns -EAGAIN when there is | |
1734 | * currently no data for a non-finalized stream, and -ENODATA | |
1735 | * when there is no data for a finalized stream. Those can be | |
1736 | * combined into a -ENODATA return value. | |
1737 | */ | |
1738 | status = GET_NEXT_SUBBUFFER_STATUS_NO_DATA; | |
1739 | break; | |
1740 | default: | |
1741 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; | |
1742 | break; | |
6e5e3c51 MD |
1743 | } |
1744 | ||
b6797c8e | 1745 | return status; |
f5ba75b4 JG |
1746 | } |
1747 | ||
6f9449c2 JG |
1748 | static |
1749 | int put_next_subbuffer(struct lttng_consumer_stream *stream, | |
f46376a1 | 1750 | struct stream_subbuffer *subbuffer __attribute__((unused))) |
6f9449c2 JG |
1751 | { |
1752 | const int ret = kernctl_put_next_subbuf(stream->wait_fd); | |
1753 | ||
1754 | if (ret) { | |
1755 | if (ret == -EFAULT) { | |
1756 | PERROR("Error in unreserving sub buffer"); | |
1757 | } else if (ret == -EIO) { | |
d41f73b7 | 1758 | /* Should never happen with newer LTTng versions */ |
6f9449c2 | 1759 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted"); |
d41f73b7 | 1760 | } |
d41f73b7 MD |
1761 | } |
1762 | ||
6f9449c2 JG |
1763 | return ret; |
1764 | } | |
1c20f0e2 | 1765 | |
f5ba75b4 JG |
1766 | static |
1767 | bool is_get_next_check_metadata_available(int tracer_fd) | |
1768 | { | |
741e787b JG |
1769 | const int ret = kernctl_get_next_subbuf_metadata_check(tracer_fd, NULL); |
1770 | const bool available = ret != -ENOTTY; | |
1771 | ||
1772 | if (ret == 0) { | |
1773 | /* get succeeded, make sure to put the subbuffer. */ | |
1774 | kernctl_put_subbuf(tracer_fd); | |
1775 | } | |
1776 | ||
1777 | return available; | |
f5ba75b4 JG |
1778 | } |
1779 | ||
091441eb MD |
1780 | static |
1781 | int signal_metadata(struct lttng_consumer_stream *stream, | |
f46376a1 | 1782 | struct lttng_consumer_local_data *ctx __attribute__((unused))) |
091441eb MD |
1783 | { |
1784 | ASSERT_LOCKED(stream->metadata_rdv_lock); | |
1785 | return pthread_cond_broadcast(&stream->metadata_rdv) ? -errno : 0; | |
1786 | } | |
1787 | ||
f5ba75b4 JG |
1788 | static |
1789 | int lttng_kconsumer_set_stream_ops( | |
6f9449c2 JG |
1790 | struct lttng_consumer_stream *stream) |
1791 | { | |
f5ba75b4 JG |
1792 | int ret = 0; |
1793 | ||
1794 | if (stream->metadata_flag && stream->chan->is_live) { | |
1795 | DBG("Attempting to enable metadata bucketization for live consumers"); | |
1796 | if (is_get_next_check_metadata_available(stream->wait_fd)) { | |
1797 | DBG("Kernel tracer supports get_next_subbuffer_metadata_check, metadata will be accumulated until a coherent state is reached"); | |
1798 | stream->read_subbuffer_ops.get_next_subbuffer = | |
1799 | get_next_subbuffer_metadata_check; | |
1800 | ret = consumer_stream_enable_metadata_bucketization( | |
1801 | stream); | |
1802 | if (ret) { | |
1803 | goto end; | |
1804 | } | |
1805 | } else { | |
1806 | /* | |
1807 | * The kernel tracer version is too old to indicate | |
1808 | * when the metadata stream has reached a "coherent" | |
1809 | * (parseable) point. | |
1810 | * | |
1811 | * This means that a live viewer may see an incoherent | |
1812 | * sequence of metadata and fail to parse it. | |
1813 | */ | |
1814 | WARN("Kernel tracer does not support get_next_subbuffer_metadata_check which may cause live clients to fail to parse the metadata stream"); | |
1815 | metadata_bucket_destroy(stream->metadata_bucket); | |
1816 | stream->metadata_bucket = NULL; | |
1817 | } | |
091441eb MD |
1818 | |
1819 | stream->read_subbuffer_ops.on_sleep = signal_metadata; | |
f5ba75b4 JG |
1820 | } |
1821 | ||
1822 | if (!stream->read_subbuffer_ops.get_next_subbuffer) { | |
1823 | if (stream->chan->output == CONSUMER_CHANNEL_MMAP) { | |
1824 | stream->read_subbuffer_ops.get_next_subbuffer = | |
1825 | get_next_subbuffer_mmap; | |
1826 | } else { | |
1827 | stream->read_subbuffer_ops.get_next_subbuffer = | |
1828 | get_next_subbuffer_splice; | |
1829 | } | |
94d49140 JD |
1830 | } |
1831 | ||
6f9449c2 JG |
1832 | if (stream->metadata_flag) { |
1833 | stream->read_subbuffer_ops.extract_subbuffer_info = | |
1834 | extract_metadata_subbuffer_info; | |
1835 | } else { | |
1836 | stream->read_subbuffer_ops.extract_subbuffer_info = | |
1837 | extract_data_subbuffer_info; | |
1838 | if (stream->chan->is_live) { | |
1839 | stream->read_subbuffer_ops.send_live_beacon = | |
1840 | consumer_flush_kernel_index; | |
1841 | } | |
309167d2 JD |
1842 | } |
1843 | ||
6f9449c2 | 1844 | stream->read_subbuffer_ops.put_next_subbuffer = put_next_subbuffer; |
f5ba75b4 JG |
1845 | end: |
1846 | return ret; | |
d41f73b7 MD |
1847 | } |
1848 | ||
1849 | int lttng_kconsumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
1850 | { | |
1851 | int ret; | |
ffe60014 | 1852 | |
a0377dfe | 1853 | LTTNG_ASSERT(stream); |
ffe60014 | 1854 | |
2bba9e53 | 1855 | /* |
d2956687 JG |
1856 | * Don't create anything if this is set for streaming or if there is |
1857 | * no current trace chunk on the parent channel. | |
2bba9e53 | 1858 | */ |
d2956687 JG |
1859 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor && |
1860 | stream->chan->trace_chunk) { | |
1861 | ret = consumer_stream_create_output_files(stream, true); | |
1862 | if (ret) { | |
fe4477ee JD |
1863 | goto error; |
1864 | } | |
ffe60014 | 1865 | } |
d41f73b7 | 1866 | |
d41f73b7 MD |
1867 | if (stream->output == LTTNG_EVENT_MMAP) { |
1868 | /* get the len of the mmap region */ | |
1869 | unsigned long mmap_len; | |
1870 | ||
1871 | ret = kernctl_get_mmap_len(stream->wait_fd, &mmap_len); | |
1872 | if (ret != 0) { | |
ffe60014 | 1873 | PERROR("kernctl_get_mmap_len"); |
d41f73b7 MD |
1874 | goto error_close_fd; |
1875 | } | |
1876 | stream->mmap_len = (size_t) mmap_len; | |
1877 | ||
ffe60014 DG |
1878 | stream->mmap_base = mmap(NULL, stream->mmap_len, PROT_READ, |
1879 | MAP_PRIVATE, stream->wait_fd, 0); | |
d41f73b7 | 1880 | if (stream->mmap_base == MAP_FAILED) { |
ffe60014 | 1881 | PERROR("Error mmaping"); |
d41f73b7 MD |
1882 | ret = -1; |
1883 | goto error_close_fd; | |
1884 | } | |
1885 | } | |
1886 | ||
f5ba75b4 JG |
1887 | ret = lttng_kconsumer_set_stream_ops(stream); |
1888 | if (ret) { | |
1889 | goto error_close_fd; | |
1890 | } | |
6f9449c2 | 1891 | |
d41f73b7 MD |
1892 | /* we return 0 to let the library handle the FD internally */ |
1893 | return 0; | |
1894 | ||
1895 | error_close_fd: | |
2f225ce2 | 1896 | if (stream->out_fd >= 0) { |
d41f73b7 MD |
1897 | int err; |
1898 | ||
1899 | err = close(stream->out_fd); | |
a0377dfe | 1900 | LTTNG_ASSERT(!err); |
2f225ce2 | 1901 | stream->out_fd = -1; |
d41f73b7 MD |
1902 | } |
1903 | error: | |
1904 | return ret; | |
1905 | } | |
1906 | ||
ca22feea DG |
1907 | /* |
1908 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
1909 | * stream. Consumer data lock MUST be acquired before calling this function |
1910 | * and the stream lock. | |
ca22feea | 1911 | * |
6d805429 | 1912 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
1913 | * data is available for trace viewer reading. |
1914 | */ | |
6d805429 | 1915 | int lttng_kconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
1916 | { |
1917 | int ret; | |
1918 | ||
a0377dfe | 1919 | LTTNG_ASSERT(stream); |
ca22feea | 1920 | |
873b9e9a MD |
1921 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
1922 | ret = 0; | |
1923 | goto end; | |
1924 | } | |
1925 | ||
ca22feea DG |
1926 | ret = kernctl_get_next_subbuf(stream->wait_fd); |
1927 | if (ret == 0) { | |
1928 | /* There is still data so let's put back this subbuffer. */ | |
1929 | ret = kernctl_put_subbuf(stream->wait_fd); | |
a0377dfe | 1930 | LTTNG_ASSERT(ret == 0); |
6d805429 | 1931 | ret = 1; /* Data is pending */ |
4e9a4686 | 1932 | goto end; |
ca22feea DG |
1933 | } |
1934 | ||
6d805429 DG |
1935 | /* Data is NOT pending and ready to be read. */ |
1936 | ret = 0; | |
ca22feea | 1937 | |
6efae65e DG |
1938 | end: |
1939 | return ret; | |
ca22feea | 1940 | } |