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