Commit | Line | Data |
---|---|---|
3bd1e081 | 1 | /* |
ab5be9fa MJ |
2 | * Copyright (C) 2011 Julien Desfossez <julien.desfossez@polymtl.ca> |
3 | * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
3bd1e081 | 5 | * |
ab5be9fa | 6 | * SPDX-License-Identifier: GPL-2.0-only |
3bd1e081 | 7 | * |
3bd1e081 MD |
8 | */ |
9 | ||
6c1c0768 | 10 | #define _LGPL_SOURCE |
3bd1e081 | 11 | #include <assert.h> |
3bd1e081 MD |
12 | #include <poll.h> |
13 | #include <pthread.h> | |
14 | #include <stdlib.h> | |
15 | #include <string.h> | |
16 | #include <sys/mman.h> | |
17 | #include <sys/socket.h> | |
18 | #include <sys/types.h> | |
77c7c900 | 19 | #include <inttypes.h> |
3bd1e081 | 20 | #include <unistd.h> |
dbb5dfe6 | 21 | #include <sys/stat.h> |
3bd1e081 | 22 | |
51a9e1c7 | 23 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 24 | #include <common/common.h> |
10a8a223 | 25 | #include <common/kernel-ctl/kernel-ctl.h> |
10a8a223 | 26 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 27 | #include <common/sessiond-comm/relayd.h> |
dbb5dfe6 | 28 | #include <common/compat/fcntl.h> |
f263b7fd | 29 | #include <common/compat/endian.h> |
acdb9057 | 30 | #include <common/pipe.h> |
00e2e675 | 31 | #include <common/relayd/relayd.h> |
fe4477ee | 32 | #include <common/utils.h> |
c8fea79c | 33 | #include <common/consumer/consumer-stream.h> |
309167d2 | 34 | #include <common/index/index.h> |
c8fea79c | 35 | #include <common/consumer/consumer-timer.h> |
d2956687 | 36 | #include <common/optional.h> |
6f9449c2 JG |
37 | #include <common/buffer-view.h> |
38 | #include <common/consumer/consumer.h> | |
39 | #include <stdint.h> | |
0857097f | 40 | |
10a8a223 | 41 | #include "kernel-consumer.h" |
3bd1e081 MD |
42 | |
43 | extern struct lttng_consumer_global_data consumer_data; | |
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 | { | |
76 | assert(stream); | |
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; | |
125 | const char *mmap_base = stream->mmap_base; | |
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 |
d2956687 | 141 | * channel. The channel lock must be held by the caller. |
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, | |
148 | uint64_t nb_packets_per_stream, | |
5c786ded | 149 | struct lttng_consumer_local_data *ctx) |
07b86b52 JD |
150 | { |
151 | int ret; | |
07b86b52 JD |
152 | struct lttng_consumer_stream *stream; |
153 | ||
6a00837f | 154 | DBG("Kernel consumer snapshot channel %" PRIu64, key); |
07b86b52 JD |
155 | |
156 | rcu_read_lock(); | |
157 | ||
07b86b52 JD |
158 | /* Splice is not supported yet for channel snapshot. */ |
159 | if (channel->output != CONSUMER_CHANNEL_MMAP) { | |
9381314c JG |
160 | ERR("Unsupported output type for channel \"%s\": mmap output is required to record a snapshot", |
161 | channel->name); | |
07b86b52 JD |
162 | ret = -1; |
163 | goto end; | |
164 | } | |
165 | ||
10a50311 | 166 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { |
923333cd | 167 | unsigned long consumed_pos, produced_pos; |
9ce5646a MD |
168 | |
169 | health_code_update(); | |
170 | ||
07b86b52 JD |
171 | /* |
172 | * Lock stream because we are about to change its state. | |
173 | */ | |
174 | pthread_mutex_lock(&stream->lock); | |
175 | ||
d2956687 JG |
176 | assert(channel->trace_chunk); |
177 | if (!lttng_trace_chunk_get(channel->trace_chunk)) { | |
178 | /* | |
179 | * Can't happen barring an internal error as the channel | |
180 | * holds a reference to the trace chunk. | |
181 | */ | |
182 | ERR("Failed to acquire reference to channel's trace chunk"); | |
183 | ret = -1; | |
184 | goto end_unlock; | |
185 | } | |
186 | assert(!stream->trace_chunk); | |
187 | stream->trace_chunk = channel->trace_chunk; | |
188 | ||
29decac3 DG |
189 | /* |
190 | * Assign the received relayd ID so we can use it for streaming. The streams | |
191 | * are not visible to anyone so this is OK to change it. | |
192 | */ | |
07b86b52 JD |
193 | stream->net_seq_idx = relayd_id; |
194 | channel->relayd_id = relayd_id; | |
195 | if (relayd_id != (uint64_t) -1ULL) { | |
10a50311 | 196 | ret = consumer_send_relayd_stream(stream, path); |
07b86b52 JD |
197 | if (ret < 0) { |
198 | ERR("sending stream to relayd"); | |
199 | goto end_unlock; | |
200 | } | |
07b86b52 | 201 | } else { |
d2956687 JG |
202 | ret = consumer_stream_create_output_files(stream, |
203 | false); | |
07b86b52 | 204 | if (ret < 0) { |
07b86b52 JD |
205 | goto end_unlock; |
206 | } | |
d2956687 JG |
207 | DBG("Kernel consumer snapshot stream (%" PRIu64 ")", |
208 | stream->key); | |
07b86b52 JD |
209 | } |
210 | ||
f22dd891 | 211 | ret = kernctl_buffer_flush_empty(stream->wait_fd); |
07b86b52 | 212 | if (ret < 0) { |
f22dd891 MD |
213 | /* |
214 | * Doing a buffer flush which does not take into | |
215 | * account empty packets. This is not perfect | |
216 | * for stream intersection, but required as a | |
217 | * fall-back when "flush_empty" is not | |
218 | * implemented by lttng-modules. | |
219 | */ | |
220 | ret = kernctl_buffer_flush(stream->wait_fd); | |
221 | if (ret < 0) { | |
222 | ERR("Failed to flush kernel stream"); | |
223 | goto end_unlock; | |
224 | } | |
07b86b52 JD |
225 | goto end_unlock; |
226 | } | |
227 | ||
228 | ret = lttng_kconsumer_take_snapshot(stream); | |
229 | if (ret < 0) { | |
230 | ERR("Taking kernel snapshot"); | |
231 | goto end_unlock; | |
232 | } | |
233 | ||
234 | ret = lttng_kconsumer_get_produced_snapshot(stream, &produced_pos); | |
235 | if (ret < 0) { | |
236 | ERR("Produced kernel snapshot position"); | |
237 | goto end_unlock; | |
238 | } | |
239 | ||
240 | ret = lttng_kconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
241 | if (ret < 0) { | |
242 | ERR("Consumerd kernel snapshot position"); | |
243 | goto end_unlock; | |
244 | } | |
245 | ||
d07ceecd MD |
246 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
247 | produced_pos, nb_packets_per_stream, | |
248 | stream->max_sb_size); | |
5c786ded | 249 | |
9377d830 | 250 | while ((long) (consumed_pos - produced_pos) < 0) { |
07b86b52 JD |
251 | ssize_t read_len; |
252 | unsigned long len, padded_len; | |
128708c3 | 253 | const char *subbuf_addr; |
fd424d99 | 254 | struct lttng_buffer_view subbuf_view; |
07b86b52 | 255 | |
9ce5646a | 256 | health_code_update(); |
07b86b52 JD |
257 | DBG("Kernel consumer taking snapshot at pos %lu", consumed_pos); |
258 | ||
259 | ret = kernctl_get_subbuf(stream->wait_fd, &consumed_pos); | |
260 | if (ret < 0) { | |
32af2c95 | 261 | if (ret != -EAGAIN) { |
07b86b52 JD |
262 | PERROR("kernctl_get_subbuf snapshot"); |
263 | goto end_unlock; | |
264 | } | |
265 | DBG("Kernel consumer get subbuf failed. Skipping it."); | |
266 | consumed_pos += stream->max_sb_size; | |
ddc93ee4 | 267 | stream->chan->lost_packets++; |
07b86b52 JD |
268 | continue; |
269 | } | |
270 | ||
271 | ret = kernctl_get_subbuf_size(stream->wait_fd, &len); | |
272 | if (ret < 0) { | |
273 | ERR("Snapshot kernctl_get_subbuf_size"); | |
29decac3 | 274 | goto error_put_subbuf; |
07b86b52 JD |
275 | } |
276 | ||
277 | ret = kernctl_get_padded_subbuf_size(stream->wait_fd, &padded_len); | |
278 | if (ret < 0) { | |
279 | ERR("Snapshot kernctl_get_padded_subbuf_size"); | |
29decac3 | 280 | goto error_put_subbuf; |
07b86b52 JD |
281 | } |
282 | ||
128708c3 JG |
283 | ret = get_current_subbuf_addr(stream, &subbuf_addr); |
284 | if (ret) { | |
285 | goto error_put_subbuf; | |
286 | } | |
287 | ||
fd424d99 JG |
288 | subbuf_view = lttng_buffer_view_init( |
289 | subbuf_addr, 0, padded_len); | |
128708c3 | 290 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, |
fd424d99 | 291 | stream, &subbuf_view, |
6f9449c2 | 292 | padded_len - len); |
07b86b52 | 293 | /* |
29decac3 DG |
294 | * We write the padded len in local tracefiles but the data len |
295 | * when using a relay. Display the error but continue processing | |
296 | * to try to release the subbuffer. | |
07b86b52 JD |
297 | */ |
298 | if (relayd_id != (uint64_t) -1ULL) { | |
299 | if (read_len != len) { | |
300 | ERR("Error sending to the relay (ret: %zd != len: %lu)", | |
301 | read_len, len); | |
302 | } | |
303 | } else { | |
304 | if (read_len != padded_len) { | |
305 | ERR("Error writing to tracefile (ret: %zd != len: %lu)", | |
306 | read_len, padded_len); | |
307 | } | |
308 | } | |
309 | ||
310 | ret = kernctl_put_subbuf(stream->wait_fd); | |
311 | if (ret < 0) { | |
312 | ERR("Snapshot kernctl_put_subbuf"); | |
313 | goto end_unlock; | |
314 | } | |
315 | consumed_pos += stream->max_sb_size; | |
316 | } | |
317 | ||
318 | if (relayd_id == (uint64_t) -1ULL) { | |
fdf9986c MD |
319 | if (stream->out_fd >= 0) { |
320 | ret = close(stream->out_fd); | |
321 | if (ret < 0) { | |
322 | PERROR("Kernel consumer snapshot close out_fd"); | |
323 | goto end_unlock; | |
324 | } | |
325 | stream->out_fd = -1; | |
07b86b52 | 326 | } |
07b86b52 JD |
327 | } else { |
328 | close_relayd_stream(stream); | |
329 | stream->net_seq_idx = (uint64_t) -1ULL; | |
330 | } | |
d2956687 JG |
331 | lttng_trace_chunk_put(stream->trace_chunk); |
332 | stream->trace_chunk = NULL; | |
07b86b52 JD |
333 | pthread_mutex_unlock(&stream->lock); |
334 | } | |
335 | ||
336 | /* All good! */ | |
337 | ret = 0; | |
338 | goto end; | |
339 | ||
29decac3 DG |
340 | error_put_subbuf: |
341 | ret = kernctl_put_subbuf(stream->wait_fd); | |
342 | if (ret < 0) { | |
343 | ERR("Snapshot kernctl_put_subbuf error path"); | |
344 | } | |
07b86b52 JD |
345 | end_unlock: |
346 | pthread_mutex_unlock(&stream->lock); | |
347 | end: | |
348 | rcu_read_unlock(); | |
349 | return ret; | |
350 | } | |
351 | ||
352 | /* | |
353 | * Read the whole metadata available for a snapshot. | |
3eb928aa | 354 | * RCU read-side lock must be held across this function to ensure existence of |
d2956687 | 355 | * metadata_channel. The channel lock must be held by the caller. |
07b86b52 JD |
356 | * |
357 | * Returns 0 on success, < 0 on error | |
358 | */ | |
d2956687 JG |
359 | static int lttng_kconsumer_snapshot_metadata( |
360 | struct lttng_consumer_channel *metadata_channel, | |
3eb928aa MD |
361 | uint64_t key, char *path, uint64_t relayd_id, |
362 | struct lttng_consumer_local_data *ctx) | |
07b86b52 | 363 | { |
d771f832 DG |
364 | int ret, use_relayd = 0; |
365 | ssize_t ret_read; | |
07b86b52 | 366 | struct lttng_consumer_stream *metadata_stream; |
d771f832 DG |
367 | |
368 | assert(ctx); | |
07b86b52 JD |
369 | |
370 | DBG("Kernel consumer snapshot metadata with key %" PRIu64 " at path %s", | |
371 | key, path); | |
372 | ||
373 | rcu_read_lock(); | |
374 | ||
07b86b52 JD |
375 | metadata_stream = metadata_channel->metadata_stream; |
376 | assert(metadata_stream); | |
d2956687 | 377 | |
fa27abe8 | 378 | pthread_mutex_lock(&metadata_stream->lock); |
d2956687 JG |
379 | assert(metadata_channel->trace_chunk); |
380 | assert(metadata_stream->trace_chunk); | |
07b86b52 | 381 | |
d771f832 | 382 | /* Flag once that we have a valid relayd for the stream. */ |
e2039c7a | 383 | if (relayd_id != (uint64_t) -1ULL) { |
d771f832 DG |
384 | use_relayd = 1; |
385 | } | |
386 | ||
387 | if (use_relayd) { | |
10a50311 | 388 | ret = consumer_send_relayd_stream(metadata_stream, path); |
e2039c7a | 389 | if (ret < 0) { |
fa27abe8 | 390 | goto error_snapshot; |
e2039c7a | 391 | } |
e2039c7a | 392 | } else { |
d2956687 JG |
393 | ret = consumer_stream_create_output_files(metadata_stream, |
394 | false); | |
e2039c7a | 395 | if (ret < 0) { |
fa27abe8 | 396 | goto error_snapshot; |
e2039c7a | 397 | } |
07b86b52 | 398 | } |
07b86b52 | 399 | |
d771f832 | 400 | do { |
9ce5646a MD |
401 | health_code_update(); |
402 | ||
6f9449c2 | 403 | ret_read = lttng_consumer_read_subbuffer(metadata_stream, ctx, true); |
d771f832 | 404 | if (ret_read < 0) { |
56591bac | 405 | if (ret_read != -EAGAIN) { |
6a00837f | 406 | ERR("Kernel snapshot reading metadata subbuffer (ret: %zd)", |
d771f832 | 407 | ret_read); |
fa27abe8 JG |
408 | ret = ret_read; |
409 | goto error_snapshot; | |
07b86b52 | 410 | } |
d771f832 | 411 | /* ret_read is negative at this point so we will exit the loop. */ |
07b86b52 JD |
412 | continue; |
413 | } | |
d771f832 | 414 | } while (ret_read >= 0); |
07b86b52 | 415 | |
d771f832 DG |
416 | if (use_relayd) { |
417 | close_relayd_stream(metadata_stream); | |
418 | metadata_stream->net_seq_idx = (uint64_t) -1ULL; | |
419 | } else { | |
fdf9986c MD |
420 | if (metadata_stream->out_fd >= 0) { |
421 | ret = close(metadata_stream->out_fd); | |
422 | if (ret < 0) { | |
423 | PERROR("Kernel consumer snapshot metadata close out_fd"); | |
424 | /* | |
425 | * Don't go on error here since the snapshot was successful at this | |
426 | * point but somehow the close failed. | |
427 | */ | |
428 | } | |
429 | metadata_stream->out_fd = -1; | |
d2956687 JG |
430 | lttng_trace_chunk_put(metadata_stream->trace_chunk); |
431 | metadata_stream->trace_chunk = NULL; | |
e2039c7a | 432 | } |
e2039c7a JD |
433 | } |
434 | ||
07b86b52 | 435 | ret = 0; |
fa27abe8 JG |
436 | error_snapshot: |
437 | pthread_mutex_unlock(&metadata_stream->lock); | |
cf53a8a6 JD |
438 | cds_list_del(&metadata_stream->send_node); |
439 | consumer_stream_destroy(metadata_stream, NULL); | |
440 | metadata_channel->metadata_stream = NULL; | |
07b86b52 JD |
441 | rcu_read_unlock(); |
442 | return ret; | |
443 | } | |
444 | ||
1803a064 MD |
445 | /* |
446 | * Receive command from session daemon and process it. | |
447 | * | |
448 | * Return 1 on success else a negative value or 0. | |
449 | */ | |
3bd1e081 MD |
450 | int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
451 | int sock, struct pollfd *consumer_sockpoll) | |
452 | { | |
453 | ssize_t ret; | |
0c759fc9 | 454 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 MD |
455 | struct lttcomm_consumer_msg msg; |
456 | ||
9ce5646a MD |
457 | health_code_update(); |
458 | ||
3bd1e081 MD |
459 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
460 | if (ret != sizeof(msg)) { | |
1803a064 | 461 | if (ret > 0) { |
c6857fcf | 462 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
1803a064 MD |
463 | ret = -1; |
464 | } | |
3bd1e081 MD |
465 | return ret; |
466 | } | |
9ce5646a MD |
467 | |
468 | health_code_update(); | |
469 | ||
84382d49 MD |
470 | /* Deprecated command */ |
471 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 472 | |
9ce5646a MD |
473 | health_code_update(); |
474 | ||
b0b335c8 MD |
475 | /* relayd needs RCU read-side protection */ |
476 | rcu_read_lock(); | |
477 | ||
3bd1e081 | 478 | switch (msg.cmd_type) { |
00e2e675 DG |
479 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
480 | { | |
f50f23d9 | 481 | /* Session daemon status message are handled in the following call. */ |
2527bf85 | 482 | consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
7735ef9e | 483 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, |
d3e2ba59 | 484 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
2527bf85 | 485 | msg.u.relayd_sock.relayd_session_id); |
00e2e675 DG |
486 | goto end_nosignal; |
487 | } | |
3bd1e081 MD |
488 | case LTTNG_CONSUMER_ADD_CHANNEL: |
489 | { | |
490 | struct lttng_consumer_channel *new_channel; | |
e43c41c5 | 491 | int ret_recv; |
d2956687 | 492 | const uint64_t chunk_id = msg.u.channel.chunk_id.value; |
3bd1e081 | 493 | |
9ce5646a MD |
494 | health_code_update(); |
495 | ||
f50f23d9 DG |
496 | /* First send a status message before receiving the fds. */ |
497 | ret = consumer_send_status_msg(sock, ret_code); | |
498 | if (ret < 0) { | |
499 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 500 | goto error_fatal; |
f50f23d9 | 501 | } |
9ce5646a MD |
502 | |
503 | health_code_update(); | |
504 | ||
d88aee68 | 505 | DBG("consumer_add_channel %" PRIu64, msg.u.channel.channel_key); |
3bd1e081 | 506 | new_channel = consumer_allocate_channel(msg.u.channel.channel_key, |
d2956687 JG |
507 | msg.u.channel.session_id, |
508 | msg.u.channel.chunk_id.is_set ? | |
509 | &chunk_id : NULL, | |
510 | msg.u.channel.pathname, | |
511 | msg.u.channel.name, | |
1624d5b7 JD |
512 | msg.u.channel.relayd_id, msg.u.channel.output, |
513 | msg.u.channel.tracefile_size, | |
1950109e | 514 | msg.u.channel.tracefile_count, 0, |
ecc48a90 | 515 | msg.u.channel.monitor, |
d7ba1388 | 516 | msg.u.channel.live_timer_interval, |
a2814ea7 | 517 | msg.u.channel.is_live, |
3d071855 | 518 | NULL, NULL); |
3bd1e081 | 519 | if (new_channel == NULL) { |
f73fabfd | 520 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
3bd1e081 MD |
521 | goto end_nosignal; |
522 | } | |
ffe60014 | 523 | new_channel->nb_init_stream_left = msg.u.channel.nb_init_streams; |
95a1109b JD |
524 | switch (msg.u.channel.output) { |
525 | case LTTNG_EVENT_SPLICE: | |
526 | new_channel->output = CONSUMER_CHANNEL_SPLICE; | |
527 | break; | |
528 | case LTTNG_EVENT_MMAP: | |
529 | new_channel->output = CONSUMER_CHANNEL_MMAP; | |
530 | break; | |
531 | default: | |
532 | ERR("Channel output unknown %d", msg.u.channel.output); | |
533 | goto end_nosignal; | |
534 | } | |
ffe60014 DG |
535 | |
536 | /* Translate and save channel type. */ | |
537 | switch (msg.u.channel.type) { | |
538 | case CONSUMER_CHANNEL_TYPE_DATA: | |
539 | case CONSUMER_CHANNEL_TYPE_METADATA: | |
540 | new_channel->type = msg.u.channel.type; | |
541 | break; | |
542 | default: | |
543 | assert(0); | |
544 | goto end_nosignal; | |
545 | }; | |
546 | ||
9ce5646a MD |
547 | health_code_update(); |
548 | ||
3bd1e081 | 549 | if (ctx->on_recv_channel != NULL) { |
e43c41c5 JD |
550 | ret_recv = ctx->on_recv_channel(new_channel); |
551 | if (ret_recv == 0) { | |
552 | ret = consumer_add_channel(new_channel, ctx); | |
553 | } else if (ret_recv < 0) { | |
3bd1e081 MD |
554 | goto end_nosignal; |
555 | } | |
556 | } else { | |
e43c41c5 | 557 | ret = consumer_add_channel(new_channel, ctx); |
3bd1e081 | 558 | } |
e9404c27 JG |
559 | if (msg.u.channel.type == CONSUMER_CHANNEL_TYPE_DATA && !ret) { |
560 | int monitor_start_ret; | |
561 | ||
562 | DBG("Consumer starting monitor timer"); | |
94d49140 JD |
563 | consumer_timer_live_start(new_channel, |
564 | msg.u.channel.live_timer_interval); | |
e9404c27 JG |
565 | monitor_start_ret = consumer_timer_monitor_start( |
566 | new_channel, | |
567 | msg.u.channel.monitor_timer_interval); | |
568 | if (monitor_start_ret < 0) { | |
569 | ERR("Starting channel monitoring timer failed"); | |
570 | goto end_nosignal; | |
571 | } | |
572 | ||
94d49140 | 573 | } |
e43c41c5 | 574 | |
9ce5646a MD |
575 | health_code_update(); |
576 | ||
e43c41c5 | 577 | /* If we received an error in add_channel, we need to report it. */ |
821fffb2 | 578 | if (ret < 0) { |
1803a064 MD |
579 | ret = consumer_send_status_msg(sock, ret); |
580 | if (ret < 0) { | |
581 | goto error_fatal; | |
582 | } | |
e43c41c5 JD |
583 | goto end_nosignal; |
584 | } | |
585 | ||
3bd1e081 MD |
586 | goto end_nosignal; |
587 | } | |
588 | case LTTNG_CONSUMER_ADD_STREAM: | |
589 | { | |
dae10966 DG |
590 | int fd; |
591 | struct lttng_pipe *stream_pipe; | |
00e2e675 | 592 | struct lttng_consumer_stream *new_stream; |
ffe60014 | 593 | struct lttng_consumer_channel *channel; |
c80048c6 | 594 | int alloc_ret = 0; |
3bd1e081 | 595 | |
ffe60014 DG |
596 | /* |
597 | * Get stream's channel reference. Needed when adding the stream to the | |
598 | * global hash table. | |
599 | */ | |
600 | channel = consumer_find_channel(msg.u.stream.channel_key); | |
601 | if (!channel) { | |
602 | /* | |
603 | * We could not find the channel. Can happen if cpu hotplug | |
604 | * happens while tearing down. | |
605 | */ | |
d88aee68 | 606 | ERR("Unable to find channel key %" PRIu64, msg.u.stream.channel_key); |
e462382a | 607 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
ffe60014 DG |
608 | } |
609 | ||
9ce5646a MD |
610 | health_code_update(); |
611 | ||
f50f23d9 DG |
612 | /* First send a status message before receiving the fds. */ |
613 | ret = consumer_send_status_msg(sock, ret_code); | |
1803a064 | 614 | if (ret < 0) { |
d771f832 | 615 | /* Somehow, the session daemon is not responding anymore. */ |
c5c7998f | 616 | goto error_add_stream_fatal; |
1803a064 | 617 | } |
9ce5646a MD |
618 | |
619 | health_code_update(); | |
620 | ||
0c759fc9 | 621 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
d771f832 | 622 | /* Channel was not found. */ |
c5c7998f | 623 | goto error_add_stream_nosignal; |
f50f23d9 DG |
624 | } |
625 | ||
d771f832 | 626 | /* Blocking call */ |
9ce5646a MD |
627 | health_poll_entry(); |
628 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
629 | health_poll_exit(); | |
84382d49 | 630 | if (ret) { |
c5c7998f | 631 | goto error_add_stream_fatal; |
3bd1e081 | 632 | } |
00e2e675 | 633 | |
9ce5646a MD |
634 | health_code_update(); |
635 | ||
00e2e675 | 636 | /* Get stream file descriptor from socket */ |
f2fc6720 MD |
637 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); |
638 | if (ret != sizeof(fd)) { | |
f73fabfd | 639 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
c5c7998f | 640 | goto end; |
3bd1e081 | 641 | } |
3bd1e081 | 642 | |
9ce5646a MD |
643 | health_code_update(); |
644 | ||
f50f23d9 DG |
645 | /* |
646 | * Send status code to session daemon only if the recv works. If the | |
647 | * above recv() failed, the session daemon is notified through the | |
648 | * error socket and the teardown is eventually done. | |
649 | */ | |
650 | ret = consumer_send_status_msg(sock, ret_code); | |
651 | if (ret < 0) { | |
652 | /* Somehow, the session daemon is not responding anymore. */ | |
c5c7998f | 653 | goto error_add_stream_nosignal; |
f50f23d9 DG |
654 | } |
655 | ||
9ce5646a MD |
656 | health_code_update(); |
657 | ||
d2956687 | 658 | pthread_mutex_lock(&channel->lock); |
6f9449c2 | 659 | new_stream = consumer_stream_create( |
49f45573 JG |
660 | channel, |
661 | channel->key, | |
ffe60014 | 662 | fd, |
ffe60014 | 663 | channel->name, |
ffe60014 DG |
664 | channel->relayd_id, |
665 | channel->session_id, | |
d2956687 | 666 | channel->trace_chunk, |
ffe60014 DG |
667 | msg.u.stream.cpu, |
668 | &alloc_ret, | |
4891ece8 | 669 | channel->type, |
d2956687 | 670 | channel->monitor); |
3bd1e081 | 671 | if (new_stream == NULL) { |
c80048c6 MD |
672 | switch (alloc_ret) { |
673 | case -ENOMEM: | |
674 | case -EINVAL: | |
675 | default: | |
676 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
677 | break; | |
c80048c6 | 678 | } |
d2956687 | 679 | pthread_mutex_unlock(&channel->lock); |
c5c7998f | 680 | goto error_add_stream_nosignal; |
3bd1e081 | 681 | } |
d771f832 | 682 | |
ffe60014 | 683 | new_stream->wait_fd = fd; |
d05185fa JG |
684 | ret = kernctl_get_max_subbuf_size(new_stream->wait_fd, |
685 | &new_stream->max_sb_size); | |
686 | if (ret < 0) { | |
687 | pthread_mutex_unlock(&channel->lock); | |
688 | ERR("Failed to get kernel maximal subbuffer size"); | |
c5c7998f | 689 | goto error_add_stream_nosignal; |
d05185fa JG |
690 | } |
691 | ||
d9a2e16e JD |
692 | consumer_stream_update_channel_attributes(new_stream, |
693 | channel); | |
00e2e675 | 694 | |
a0c83db9 DG |
695 | /* |
696 | * We've just assigned the channel to the stream so increment the | |
07b86b52 JD |
697 | * refcount right now. We don't need to increment the refcount for |
698 | * streams in no monitor because we handle manually the cleanup of | |
699 | * those. It is very important to make sure there is NO prior | |
700 | * consumer_del_stream() calls or else the refcount will be unbalanced. | |
a0c83db9 | 701 | */ |
07b86b52 JD |
702 | if (channel->monitor) { |
703 | uatomic_inc(&new_stream->chan->refcount); | |
704 | } | |
9d9353f9 | 705 | |
fb3a43a9 DG |
706 | /* |
707 | * The buffer flush is done on the session daemon side for the kernel | |
708 | * so no need for the stream "hangup_flush_done" variable to be | |
709 | * tracked. This is important for a kernel stream since we don't rely | |
710 | * on the flush state of the stream to read data. It's not the case for | |
711 | * user space tracing. | |
712 | */ | |
713 | new_stream->hangup_flush_done = 0; | |
714 | ||
9ce5646a MD |
715 | health_code_update(); |
716 | ||
d2956687 | 717 | pthread_mutex_lock(&new_stream->lock); |
633d0084 DG |
718 | if (ctx->on_recv_stream) { |
719 | ret = ctx->on_recv_stream(new_stream); | |
720 | if (ret < 0) { | |
d2956687 JG |
721 | pthread_mutex_unlock(&new_stream->lock); |
722 | pthread_mutex_unlock(&channel->lock); | |
d771f832 | 723 | consumer_stream_free(new_stream); |
c5c7998f | 724 | goto error_add_stream_nosignal; |
fb3a43a9 | 725 | } |
633d0084 | 726 | } |
9ce5646a MD |
727 | health_code_update(); |
728 | ||
07b86b52 JD |
729 | if (new_stream->metadata_flag) { |
730 | channel->metadata_stream = new_stream; | |
731 | } | |
732 | ||
2bba9e53 DG |
733 | /* Do not monitor this stream. */ |
734 | if (!channel->monitor) { | |
5eecee74 | 735 | DBG("Kernel consumer add stream %s in no monitor mode with " |
6dc3064a | 736 | "relayd id %" PRIu64, new_stream->name, |
5eecee74 | 737 | new_stream->net_seq_idx); |
10a50311 | 738 | cds_list_add(&new_stream->send_node, &channel->streams.head); |
d2956687 JG |
739 | pthread_mutex_unlock(&new_stream->lock); |
740 | pthread_mutex_unlock(&channel->lock); | |
c5c7998f | 741 | goto end_add_stream; |
6dc3064a DG |
742 | } |
743 | ||
e1b71bdc DG |
744 | /* Send stream to relayd if the stream has an ID. */ |
745 | if (new_stream->net_seq_idx != (uint64_t) -1ULL) { | |
194ee077 DG |
746 | ret = consumer_send_relayd_stream(new_stream, |
747 | new_stream->chan->pathname); | |
e1b71bdc | 748 | if (ret < 0) { |
d2956687 JG |
749 | pthread_mutex_unlock(&new_stream->lock); |
750 | pthread_mutex_unlock(&channel->lock); | |
e1b71bdc | 751 | consumer_stream_free(new_stream); |
c5c7998f | 752 | goto error_add_stream_nosignal; |
e1b71bdc | 753 | } |
001b7e62 MD |
754 | |
755 | /* | |
756 | * If adding an extra stream to an already | |
757 | * existing channel (e.g. cpu hotplug), we need | |
758 | * to send the "streams_sent" command to relayd. | |
759 | */ | |
760 | if (channel->streams_sent_to_relayd) { | |
761 | ret = consumer_send_relayd_streams_sent( | |
762 | new_stream->net_seq_idx); | |
763 | if (ret < 0) { | |
d2956687 JG |
764 | pthread_mutex_unlock(&new_stream->lock); |
765 | pthread_mutex_unlock(&channel->lock); | |
c5c7998f | 766 | goto error_add_stream_nosignal; |
001b7e62 MD |
767 | } |
768 | } | |
e2039c7a | 769 | } |
d2956687 JG |
770 | pthread_mutex_unlock(&new_stream->lock); |
771 | pthread_mutex_unlock(&channel->lock); | |
e2039c7a | 772 | |
50f8ae69 | 773 | /* Get the right pipe where the stream will be sent. */ |
633d0084 | 774 | if (new_stream->metadata_flag) { |
66d583dc | 775 | consumer_add_metadata_stream(new_stream); |
dae10966 | 776 | stream_pipe = ctx->consumer_metadata_pipe; |
3bd1e081 | 777 | } else { |
66d583dc | 778 | consumer_add_data_stream(new_stream); |
dae10966 | 779 | stream_pipe = ctx->consumer_data_pipe; |
50f8ae69 DG |
780 | } |
781 | ||
66d583dc | 782 | /* Visible to other threads */ |
5ab66908 MD |
783 | new_stream->globally_visible = 1; |
784 | ||
9ce5646a MD |
785 | health_code_update(); |
786 | ||
dae10966 | 787 | ret = lttng_pipe_write(stream_pipe, &new_stream, sizeof(new_stream)); |
50f8ae69 | 788 | if (ret < 0) { |
dae10966 | 789 | ERR("Consumer write %s stream to pipe %d", |
50f8ae69 | 790 | new_stream->metadata_flag ? "metadata" : "data", |
dae10966 | 791 | lttng_pipe_get_writefd(stream_pipe)); |
5ab66908 MD |
792 | if (new_stream->metadata_flag) { |
793 | consumer_del_stream_for_metadata(new_stream); | |
794 | } else { | |
795 | consumer_del_stream_for_data(new_stream); | |
796 | } | |
c5c7998f | 797 | goto error_add_stream_nosignal; |
3bd1e081 | 798 | } |
00e2e675 | 799 | |
02d02e31 JD |
800 | DBG("Kernel consumer ADD_STREAM %s (fd: %d) %s with relayd id %" PRIu64, |
801 | new_stream->name, fd, new_stream->chan->pathname, new_stream->relayd_stream_id); | |
c5c7998f | 802 | end_add_stream: |
3bd1e081 | 803 | break; |
c5c7998f JG |
804 | error_add_stream_nosignal: |
805 | goto end_nosignal; | |
806 | error_add_stream_fatal: | |
807 | goto error_fatal; | |
3bd1e081 | 808 | } |
a4baae1b JD |
809 | case LTTNG_CONSUMER_STREAMS_SENT: |
810 | { | |
811 | struct lttng_consumer_channel *channel; | |
812 | ||
813 | /* | |
814 | * Get stream's channel reference. Needed when adding the stream to the | |
815 | * global hash table. | |
816 | */ | |
817 | channel = consumer_find_channel(msg.u.sent_streams.channel_key); | |
818 | if (!channel) { | |
819 | /* | |
820 | * We could not find the channel. Can happen if cpu hotplug | |
821 | * happens while tearing down. | |
822 | */ | |
823 | ERR("Unable to find channel key %" PRIu64, | |
824 | msg.u.sent_streams.channel_key); | |
e462382a | 825 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
a4baae1b JD |
826 | } |
827 | ||
828 | health_code_update(); | |
829 | ||
830 | /* | |
831 | * Send status code to session daemon. | |
832 | */ | |
833 | ret = consumer_send_status_msg(sock, ret_code); | |
f261ad0a | 834 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
a4baae1b | 835 | /* Somehow, the session daemon is not responding anymore. */ |
80d5a658 | 836 | goto error_streams_sent_nosignal; |
a4baae1b JD |
837 | } |
838 | ||
839 | health_code_update(); | |
840 | ||
841 | /* | |
842 | * We should not send this message if we don't monitor the | |
843 | * streams in this channel. | |
844 | */ | |
845 | if (!channel->monitor) { | |
80d5a658 | 846 | goto end_error_streams_sent; |
a4baae1b JD |
847 | } |
848 | ||
849 | health_code_update(); | |
850 | /* Send stream to relayd if the stream has an ID. */ | |
851 | if (msg.u.sent_streams.net_seq_idx != (uint64_t) -1ULL) { | |
852 | ret = consumer_send_relayd_streams_sent( | |
853 | msg.u.sent_streams.net_seq_idx); | |
854 | if (ret < 0) { | |
80d5a658 | 855 | goto error_streams_sent_nosignal; |
a4baae1b | 856 | } |
001b7e62 | 857 | channel->streams_sent_to_relayd = true; |
a4baae1b | 858 | } |
80d5a658 | 859 | end_error_streams_sent: |
a4baae1b | 860 | break; |
80d5a658 JG |
861 | error_streams_sent_nosignal: |
862 | goto end_nosignal; | |
a4baae1b | 863 | } |
3bd1e081 MD |
864 | case LTTNG_CONSUMER_UPDATE_STREAM: |
865 | { | |
3f8e211f DG |
866 | rcu_read_unlock(); |
867 | return -ENOSYS; | |
868 | } | |
869 | case LTTNG_CONSUMER_DESTROY_RELAYD: | |
870 | { | |
a6ba4fe1 | 871 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
3f8e211f DG |
872 | struct consumer_relayd_sock_pair *relayd; |
873 | ||
a6ba4fe1 | 874 | DBG("Kernel consumer destroying relayd %" PRIu64, index); |
3f8e211f DG |
875 | |
876 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 877 | relayd = consumer_find_relayd(index); |
3f8e211f | 878 | if (relayd == NULL) { |
3448e266 | 879 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 880 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
3bd1e081 | 881 | } |
3f8e211f | 882 | |
a6ba4fe1 DG |
883 | /* |
884 | * Each relayd socket pair has a refcount of stream attached to it | |
885 | * which tells if the relayd is still active or not depending on the | |
886 | * refcount value. | |
887 | * | |
888 | * This will set the destroy flag of the relayd object and destroy it | |
889 | * if the refcount reaches zero when called. | |
890 | * | |
891 | * The destroy can happen either here or when a stream fd hangs up. | |
892 | */ | |
f50f23d9 DG |
893 | if (relayd) { |
894 | consumer_flag_relayd_for_destroy(relayd); | |
895 | } | |
896 | ||
9ce5646a MD |
897 | health_code_update(); |
898 | ||
f50f23d9 DG |
899 | ret = consumer_send_status_msg(sock, ret_code); |
900 | if (ret < 0) { | |
901 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 902 | goto error_fatal; |
f50f23d9 | 903 | } |
3f8e211f | 904 | |
3f8e211f | 905 | goto end_nosignal; |
3bd1e081 | 906 | } |
6d805429 | 907 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 908 | { |
c8f59ee5 | 909 | int32_t ret; |
6d805429 | 910 | uint64_t id = msg.u.data_pending.session_id; |
c8f59ee5 | 911 | |
6d805429 | 912 | DBG("Kernel consumer data pending command for id %" PRIu64, id); |
c8f59ee5 | 913 | |
6d805429 | 914 | ret = consumer_data_pending(id); |
c8f59ee5 | 915 | |
9ce5646a MD |
916 | health_code_update(); |
917 | ||
c8f59ee5 DG |
918 | /* Send back returned value to session daemon */ |
919 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
920 | if (ret < 0) { | |
6d805429 | 921 | PERROR("send data pending ret code"); |
1803a064 | 922 | goto error_fatal; |
c8f59ee5 | 923 | } |
f50f23d9 DG |
924 | |
925 | /* | |
926 | * No need to send back a status message since the data pending | |
927 | * returned value is the response. | |
928 | */ | |
c8f59ee5 | 929 | break; |
53632229 | 930 | } |
6dc3064a DG |
931 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
932 | { | |
3eb928aa MD |
933 | struct lttng_consumer_channel *channel; |
934 | uint64_t key = msg.u.snapshot_channel.key; | |
935 | ||
936 | channel = consumer_find_channel(key); | |
937 | if (!channel) { | |
938 | ERR("Channel %" PRIu64 " not found", key); | |
939 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
07b86b52 | 940 | } else { |
d2956687 | 941 | pthread_mutex_lock(&channel->lock); |
3eb928aa MD |
942 | if (msg.u.snapshot_channel.metadata == 1) { |
943 | ret = lttng_kconsumer_snapshot_metadata(channel, key, | |
944 | msg.u.snapshot_channel.pathname, | |
945 | msg.u.snapshot_channel.relayd_id, ctx); | |
946 | if (ret < 0) { | |
947 | ERR("Snapshot metadata failed"); | |
948 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
949 | } | |
950 | } else { | |
951 | ret = lttng_kconsumer_snapshot_channel(channel, key, | |
952 | msg.u.snapshot_channel.pathname, | |
953 | msg.u.snapshot_channel.relayd_id, | |
954 | msg.u.snapshot_channel.nb_packets_per_stream, | |
955 | ctx); | |
956 | if (ret < 0) { | |
957 | ERR("Snapshot channel failed"); | |
958 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
959 | } | |
07b86b52 | 960 | } |
d2956687 | 961 | pthread_mutex_unlock(&channel->lock); |
07b86b52 | 962 | } |
9ce5646a MD |
963 | health_code_update(); |
964 | ||
6dc3064a DG |
965 | ret = consumer_send_status_msg(sock, ret_code); |
966 | if (ret < 0) { | |
967 | /* Somehow, the session daemon is not responding anymore. */ | |
968 | goto end_nosignal; | |
969 | } | |
970 | break; | |
971 | } | |
07b86b52 JD |
972 | case LTTNG_CONSUMER_DESTROY_CHANNEL: |
973 | { | |
974 | uint64_t key = msg.u.destroy_channel.key; | |
975 | struct lttng_consumer_channel *channel; | |
976 | ||
977 | channel = consumer_find_channel(key); | |
978 | if (!channel) { | |
979 | ERR("Kernel consumer destroy channel %" PRIu64 " not found", key); | |
e462382a | 980 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
07b86b52 JD |
981 | } |
982 | ||
9ce5646a MD |
983 | health_code_update(); |
984 | ||
07b86b52 JD |
985 | ret = consumer_send_status_msg(sock, ret_code); |
986 | if (ret < 0) { | |
987 | /* Somehow, the session daemon is not responding anymore. */ | |
a9d36096 | 988 | goto end_destroy_channel; |
07b86b52 JD |
989 | } |
990 | ||
9ce5646a MD |
991 | health_code_update(); |
992 | ||
15dc512a DG |
993 | /* Stop right now if no channel was found. */ |
994 | if (!channel) { | |
a9d36096 | 995 | goto end_destroy_channel; |
15dc512a DG |
996 | } |
997 | ||
07b86b52 JD |
998 | /* |
999 | * This command should ONLY be issued for channel with streams set in | |
1000 | * no monitor mode. | |
1001 | */ | |
1002 | assert(!channel->monitor); | |
1003 | ||
1004 | /* | |
1005 | * The refcount should ALWAYS be 0 in the case of a channel in no | |
1006 | * monitor mode. | |
1007 | */ | |
1008 | assert(!uatomic_sub_return(&channel->refcount, 1)); | |
1009 | ||
1010 | consumer_del_channel(channel); | |
a9d36096 | 1011 | end_destroy_channel: |
07b86b52 JD |
1012 | goto end_nosignal; |
1013 | } | |
fb83fe64 JD |
1014 | case LTTNG_CONSUMER_DISCARDED_EVENTS: |
1015 | { | |
66ab32be JD |
1016 | ssize_t ret; |
1017 | uint64_t count; | |
fb83fe64 JD |
1018 | struct lttng_consumer_channel *channel; |
1019 | uint64_t id = msg.u.discarded_events.session_id; | |
1020 | uint64_t key = msg.u.discarded_events.channel_key; | |
1021 | ||
e5742757 MD |
1022 | DBG("Kernel consumer discarded events command for session id %" |
1023 | PRIu64 ", channel key %" PRIu64, id, key); | |
1024 | ||
fb83fe64 JD |
1025 | channel = consumer_find_channel(key); |
1026 | if (!channel) { | |
1027 | ERR("Kernel consumer discarded events channel %" | |
1028 | PRIu64 " not found", key); | |
66ab32be | 1029 | count = 0; |
e5742757 | 1030 | } else { |
66ab32be | 1031 | count = channel->discarded_events; |
fb83fe64 JD |
1032 | } |
1033 | ||
fb83fe64 JD |
1034 | health_code_update(); |
1035 | ||
1036 | /* Send back returned value to session daemon */ | |
66ab32be | 1037 | ret = lttcomm_send_unix_sock(sock, &count, sizeof(count)); |
fb83fe64 JD |
1038 | if (ret < 0) { |
1039 | PERROR("send discarded events"); | |
1040 | goto error_fatal; | |
1041 | } | |
1042 | ||
1043 | break; | |
1044 | } | |
1045 | case LTTNG_CONSUMER_LOST_PACKETS: | |
1046 | { | |
66ab32be JD |
1047 | ssize_t ret; |
1048 | uint64_t count; | |
fb83fe64 JD |
1049 | struct lttng_consumer_channel *channel; |
1050 | uint64_t id = msg.u.lost_packets.session_id; | |
1051 | uint64_t key = msg.u.lost_packets.channel_key; | |
1052 | ||
e5742757 MD |
1053 | DBG("Kernel consumer lost packets command for session id %" |
1054 | PRIu64 ", channel key %" PRIu64, id, key); | |
1055 | ||
fb83fe64 JD |
1056 | channel = consumer_find_channel(key); |
1057 | if (!channel) { | |
1058 | ERR("Kernel consumer lost packets channel %" | |
1059 | PRIu64 " not found", key); | |
66ab32be | 1060 | count = 0; |
e5742757 | 1061 | } else { |
66ab32be | 1062 | count = channel->lost_packets; |
fb83fe64 JD |
1063 | } |
1064 | ||
fb83fe64 JD |
1065 | health_code_update(); |
1066 | ||
1067 | /* Send back returned value to session daemon */ | |
66ab32be | 1068 | ret = lttcomm_send_unix_sock(sock, &count, sizeof(count)); |
fb83fe64 JD |
1069 | if (ret < 0) { |
1070 | PERROR("send lost packets"); | |
1071 | goto error_fatal; | |
1072 | } | |
1073 | ||
1074 | break; | |
1075 | } | |
b3530820 JG |
1076 | case LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE: |
1077 | { | |
1078 | int channel_monitor_pipe; | |
1079 | ||
1080 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1081 | /* Successfully received the command's type. */ | |
1082 | ret = consumer_send_status_msg(sock, ret_code); | |
1083 | if (ret < 0) { | |
1084 | goto error_fatal; | |
1085 | } | |
1086 | ||
1087 | ret = lttcomm_recv_fds_unix_sock(sock, &channel_monitor_pipe, | |
1088 | 1); | |
1089 | if (ret != sizeof(channel_monitor_pipe)) { | |
1090 | ERR("Failed to receive channel monitor pipe"); | |
1091 | goto error_fatal; | |
1092 | } | |
1093 | ||
1094 | DBG("Received channel monitor pipe (%d)", channel_monitor_pipe); | |
1095 | ret = consumer_timer_thread_set_channel_monitor_pipe( | |
1096 | channel_monitor_pipe); | |
1097 | if (!ret) { | |
1098 | int flags; | |
1099 | ||
1100 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1101 | /* Set the pipe as non-blocking. */ | |
1102 | ret = fcntl(channel_monitor_pipe, F_GETFL, 0); | |
1103 | if (ret == -1) { | |
1104 | PERROR("fcntl get flags of the channel monitoring pipe"); | |
1105 | goto error_fatal; | |
1106 | } | |
1107 | flags = ret; | |
1108 | ||
1109 | ret = fcntl(channel_monitor_pipe, F_SETFL, | |
1110 | flags | O_NONBLOCK); | |
1111 | if (ret == -1) { | |
1112 | PERROR("fcntl set O_NONBLOCK flag of the channel monitoring pipe"); | |
1113 | goto error_fatal; | |
1114 | } | |
1115 | DBG("Channel monitor pipe set as non-blocking"); | |
1116 | } else { | |
1117 | ret_code = LTTCOMM_CONSUMERD_ALREADY_SET; | |
1118 | } | |
1119 | ret = consumer_send_status_msg(sock, ret_code); | |
1120 | if (ret < 0) { | |
1121 | goto error_fatal; | |
1122 | } | |
1123 | break; | |
1124 | } | |
b99a8d42 JD |
1125 | case LTTNG_CONSUMER_ROTATE_CHANNEL: |
1126 | { | |
92b7a7f8 MD |
1127 | struct lttng_consumer_channel *channel; |
1128 | uint64_t key = msg.u.rotate_channel.key; | |
b99a8d42 | 1129 | |
92b7a7f8 | 1130 | DBG("Consumer rotate channel %" PRIu64, key); |
b99a8d42 | 1131 | |
92b7a7f8 MD |
1132 | channel = consumer_find_channel(key); |
1133 | if (!channel) { | |
1134 | ERR("Channel %" PRIu64 " not found", key); | |
1135 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
1136 | } else { | |
1137 | /* | |
1138 | * Sample the rotate position of all the streams in this channel. | |
1139 | */ | |
1140 | ret = lttng_consumer_rotate_channel(channel, key, | |
92b7a7f8 MD |
1141 | msg.u.rotate_channel.relayd_id, |
1142 | msg.u.rotate_channel.metadata, | |
92b7a7f8 MD |
1143 | ctx); |
1144 | if (ret < 0) { | |
1145 | ERR("Rotate channel failed"); | |
1146 | ret_code = LTTCOMM_CONSUMERD_ROTATION_FAIL; | |
1147 | } | |
b99a8d42 | 1148 | |
92b7a7f8 MD |
1149 | health_code_update(); |
1150 | } | |
b99a8d42 JD |
1151 | ret = consumer_send_status_msg(sock, ret_code); |
1152 | if (ret < 0) { | |
1153 | /* Somehow, the session daemon is not responding anymore. */ | |
713bdd26 | 1154 | goto error_rotate_channel; |
b99a8d42 | 1155 | } |
92b7a7f8 MD |
1156 | if (channel) { |
1157 | /* Rotate the streams that are ready right now. */ | |
1158 | ret = lttng_consumer_rotate_ready_streams( | |
1159 | channel, key, ctx); | |
1160 | if (ret < 0) { | |
1161 | ERR("Rotate ready streams failed"); | |
1162 | } | |
b99a8d42 | 1163 | } |
b99a8d42 | 1164 | break; |
713bdd26 JG |
1165 | error_rotate_channel: |
1166 | goto end_nosignal; | |
b99a8d42 | 1167 | } |
5f3aff8b MD |
1168 | case LTTNG_CONSUMER_CLEAR_CHANNEL: |
1169 | { | |
1170 | struct lttng_consumer_channel *channel; | |
1171 | uint64_t key = msg.u.clear_channel.key; | |
1172 | ||
1173 | channel = consumer_find_channel(key); | |
1174 | if (!channel) { | |
1175 | DBG("Channel %" PRIu64 " not found", key); | |
1176 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
1177 | } else { | |
1178 | ret = lttng_consumer_clear_channel(channel); | |
1179 | if (ret) { | |
1180 | ERR("Clear channel failed"); | |
1181 | ret_code = ret; | |
1182 | } | |
1183 | ||
1184 | health_code_update(); | |
1185 | } | |
1186 | ret = consumer_send_status_msg(sock, ret_code); | |
1187 | if (ret < 0) { | |
1188 | /* Somehow, the session daemon is not responding anymore. */ | |
1189 | goto end_nosignal; | |
1190 | } | |
1191 | ||
1192 | break; | |
1193 | } | |
d2956687 | 1194 | case LTTNG_CONSUMER_INIT: |
00fb02ac | 1195 | { |
d2956687 JG |
1196 | ret_code = lttng_consumer_init_command(ctx, |
1197 | msg.u.init.sessiond_uuid); | |
00fb02ac | 1198 | health_code_update(); |
00fb02ac JD |
1199 | ret = consumer_send_status_msg(sock, ret_code); |
1200 | if (ret < 0) { | |
1201 | /* Somehow, the session daemon is not responding anymore. */ | |
1202 | goto end_nosignal; | |
1203 | } | |
1204 | break; | |
1205 | } | |
d2956687 | 1206 | case LTTNG_CONSUMER_CREATE_TRACE_CHUNK: |
d88744a4 | 1207 | { |
d2956687 | 1208 | const struct lttng_credentials credentials = { |
e5add6d0 JG |
1209 | .uid = msg.u.create_trace_chunk.credentials.value.uid, |
1210 | .gid = msg.u.create_trace_chunk.credentials.value.gid, | |
d2956687 JG |
1211 | }; |
1212 | const bool is_local_trace = | |
1213 | !msg.u.create_trace_chunk.relayd_id.is_set; | |
1214 | const uint64_t relayd_id = | |
1215 | msg.u.create_trace_chunk.relayd_id.value; | |
1216 | const char *chunk_override_name = | |
1217 | *msg.u.create_trace_chunk.override_name ? | |
1218 | msg.u.create_trace_chunk.override_name : | |
1219 | NULL; | |
cbf53d23 | 1220 | struct lttng_directory_handle *chunk_directory_handle = NULL; |
d88744a4 | 1221 | |
d2956687 JG |
1222 | /* |
1223 | * The session daemon will only provide a chunk directory file | |
1224 | * descriptor for local traces. | |
1225 | */ | |
1226 | if (is_local_trace) { | |
1227 | int chunk_dirfd; | |
19990ed5 | 1228 | |
d2956687 JG |
1229 | /* Acnowledge the reception of the command. */ |
1230 | ret = consumer_send_status_msg(sock, | |
1231 | LTTCOMM_CONSUMERD_SUCCESS); | |
1232 | if (ret < 0) { | |
1233 | /* Somehow, the session daemon is not responding anymore. */ | |
1234 | goto end_nosignal; | |
1235 | } | |
92816cc3 | 1236 | |
d2956687 JG |
1237 | ret = lttcomm_recv_fds_unix_sock(sock, &chunk_dirfd, 1); |
1238 | if (ret != sizeof(chunk_dirfd)) { | |
1239 | ERR("Failed to receive trace chunk directory file descriptor"); | |
1240 | goto error_fatal; | |
1241 | } | |
92816cc3 | 1242 | |
d2956687 JG |
1243 | DBG("Received trace chunk directory fd (%d)", |
1244 | chunk_dirfd); | |
cbf53d23 | 1245 | chunk_directory_handle = lttng_directory_handle_create_from_dirfd( |
d2956687 | 1246 | chunk_dirfd); |
cbf53d23 | 1247 | if (!chunk_directory_handle) { |
d2956687 JG |
1248 | ERR("Failed to initialize chunk directory handle from directory file descriptor"); |
1249 | if (close(chunk_dirfd)) { | |
1250 | PERROR("Failed to close chunk directory file descriptor"); | |
1251 | } | |
1252 | goto error_fatal; | |
1253 | } | |
92816cc3 JG |
1254 | } |
1255 | ||
d2956687 JG |
1256 | ret_code = lttng_consumer_create_trace_chunk( |
1257 | !is_local_trace ? &relayd_id : NULL, | |
1258 | msg.u.create_trace_chunk.session_id, | |
1259 | msg.u.create_trace_chunk.chunk_id, | |
e5add6d0 JG |
1260 | (time_t) msg.u.create_trace_chunk |
1261 | .creation_timestamp, | |
d2956687 | 1262 | chunk_override_name, |
e5add6d0 JG |
1263 | msg.u.create_trace_chunk.credentials.is_set ? |
1264 | &credentials : | |
1265 | NULL, | |
cbf53d23 JG |
1266 | chunk_directory_handle); |
1267 | lttng_directory_handle_put(chunk_directory_handle); | |
d2956687 | 1268 | goto end_msg_sessiond; |
d88744a4 | 1269 | } |
d2956687 | 1270 | case LTTNG_CONSUMER_CLOSE_TRACE_CHUNK: |
a1ae2ea5 | 1271 | { |
bbc4768c JG |
1272 | enum lttng_trace_chunk_command_type close_command = |
1273 | msg.u.close_trace_chunk.close_command.value; | |
d2956687 JG |
1274 | const uint64_t relayd_id = |
1275 | msg.u.close_trace_chunk.relayd_id.value; | |
ecd1a12f MD |
1276 | struct lttcomm_consumer_close_trace_chunk_reply reply; |
1277 | char path[LTTNG_PATH_MAX]; | |
d2956687 JG |
1278 | |
1279 | ret_code = lttng_consumer_close_trace_chunk( | |
1280 | msg.u.close_trace_chunk.relayd_id.is_set ? | |
bbc4768c JG |
1281 | &relayd_id : |
1282 | NULL, | |
d2956687 JG |
1283 | msg.u.close_trace_chunk.session_id, |
1284 | msg.u.close_trace_chunk.chunk_id, | |
bbc4768c JG |
1285 | (time_t) msg.u.close_trace_chunk.close_timestamp, |
1286 | msg.u.close_trace_chunk.close_command.is_set ? | |
1287 | &close_command : | |
ecd1a12f MD |
1288 | NULL, path); |
1289 | reply.ret_code = ret_code; | |
1290 | reply.path_length = strlen(path) + 1; | |
1291 | ret = lttcomm_send_unix_sock(sock, &reply, sizeof(reply)); | |
1292 | if (ret != sizeof(reply)) { | |
1293 | goto error_fatal; | |
1294 | } | |
1295 | ret = lttcomm_send_unix_sock(sock, path, reply.path_length); | |
1296 | if (ret != reply.path_length) { | |
1297 | goto error_fatal; | |
1298 | } | |
1299 | goto end_nosignal; | |
3654ed19 | 1300 | } |
d2956687 | 1301 | case LTTNG_CONSUMER_TRACE_CHUNK_EXISTS: |
3654ed19 | 1302 | { |
d2956687 JG |
1303 | const uint64_t relayd_id = |
1304 | msg.u.trace_chunk_exists.relayd_id.value; | |
1305 | ||
1306 | ret_code = lttng_consumer_trace_chunk_exists( | |
1307 | msg.u.trace_chunk_exists.relayd_id.is_set ? | |
1308 | &relayd_id : NULL, | |
1309 | msg.u.trace_chunk_exists.session_id, | |
1310 | msg.u.trace_chunk_exists.chunk_id); | |
1311 | goto end_msg_sessiond; | |
a1ae2ea5 | 1312 | } |
3bd1e081 | 1313 | default: |
3f8e211f | 1314 | goto end_nosignal; |
3bd1e081 | 1315 | } |
3f8e211f | 1316 | |
3bd1e081 | 1317 | end_nosignal: |
4cbc1a04 DG |
1318 | /* |
1319 | * Return 1 to indicate success since the 0 value can be a socket | |
1320 | * shutdown during the recv() or send() call. | |
1321 | */ | |
c5c7998f JG |
1322 | ret = 1; |
1323 | goto end; | |
1324 | error_fatal: | |
1325 | /* This will issue a consumer stop. */ | |
1326 | ret = -1; | |
1327 | goto end; | |
d2956687 JG |
1328 | end_msg_sessiond: |
1329 | /* | |
1330 | * The returned value here is not useful since either way we'll return 1 to | |
1331 | * the caller because the session daemon socket management is done | |
1332 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. | |
1333 | */ | |
1334 | ret = consumer_send_status_msg(sock, ret_code); | |
1335 | if (ret < 0) { | |
1336 | goto error_fatal; | |
1337 | } | |
c5c7998f JG |
1338 | ret = 1; |
1339 | end: | |
d2956687 | 1340 | health_code_update(); |
1803a064 | 1341 | rcu_read_unlock(); |
c5c7998f | 1342 | return ret; |
3bd1e081 | 1343 | } |
d41f73b7 | 1344 | |
94d49140 JD |
1345 | /* |
1346 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
1347 | * metadata thread can consumer them. | |
1348 | * | |
1349 | * Metadata stream lock MUST be acquired. | |
1350 | * | |
1351 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream | |
1352 | * is empty or a negative value on error. | |
1353 | */ | |
1354 | int lttng_kconsumer_sync_metadata(struct lttng_consumer_stream *metadata) | |
1355 | { | |
1356 | int ret; | |
1357 | ||
1358 | assert(metadata); | |
1359 | ||
1360 | ret = kernctl_buffer_flush(metadata->wait_fd); | |
1361 | if (ret < 0) { | |
1362 | ERR("Failed to flush kernel stream"); | |
1363 | goto end; | |
1364 | } | |
1365 | ||
1366 | ret = kernctl_snapshot(metadata->wait_fd); | |
1367 | if (ret < 0) { | |
32af2c95 | 1368 | if (ret != -EAGAIN) { |
94d49140 JD |
1369 | ERR("Sync metadata, taking kernel snapshot failed."); |
1370 | goto end; | |
1371 | } | |
1372 | DBG("Sync metadata, no new kernel metadata"); | |
1373 | /* No new metadata, exit. */ | |
1374 | ret = ENODATA; | |
1375 | goto end; | |
1376 | } | |
1377 | ||
1378 | end: | |
1379 | return ret; | |
1380 | } | |
309167d2 | 1381 | |
fb83fe64 | 1382 | static |
6f9449c2 JG |
1383 | int extract_common_subbuffer_info(struct lttng_consumer_stream *stream, |
1384 | struct stream_subbuffer *subbuf) | |
fb83fe64 JD |
1385 | { |
1386 | int ret; | |
fb83fe64 | 1387 | |
6f9449c2 JG |
1388 | ret = kernctl_get_subbuf_size( |
1389 | stream->wait_fd, &subbuf->info.data.subbuf_size); | |
1390 | if (ret) { | |
fb83fe64 JD |
1391 | goto end; |
1392 | } | |
fb83fe64 | 1393 | |
6f9449c2 JG |
1394 | ret = kernctl_get_padded_subbuf_size( |
1395 | stream->wait_fd, &subbuf->info.data.padded_subbuf_size); | |
1396 | if (ret) { | |
fb83fe64 JD |
1397 | goto end; |
1398 | } | |
fb83fe64 JD |
1399 | |
1400 | end: | |
1401 | return ret; | |
1402 | } | |
1403 | ||
93ec662e | 1404 | static |
6f9449c2 JG |
1405 | int extract_metadata_subbuffer_info(struct lttng_consumer_stream *stream, |
1406 | struct stream_subbuffer *subbuf) | |
93ec662e JD |
1407 | { |
1408 | int ret; | |
93ec662e | 1409 | |
6f9449c2 JG |
1410 | ret = extract_common_subbuffer_info(stream, subbuf); |
1411 | if (ret) { | |
93ec662e JD |
1412 | goto end; |
1413 | } | |
1414 | ||
6f9449c2 JG |
1415 | ret = kernctl_get_metadata_version( |
1416 | stream->wait_fd, &subbuf->info.metadata.version); | |
1417 | if (ret) { | |
93ec662e JD |
1418 | goto end; |
1419 | } | |
1420 | ||
93ec662e JD |
1421 | end: |
1422 | return ret; | |
1423 | } | |
1424 | ||
6f9449c2 JG |
1425 | static |
1426 | int extract_data_subbuffer_info(struct lttng_consumer_stream *stream, | |
1427 | struct stream_subbuffer *subbuf) | |
d41f73b7 | 1428 | { |
6f9449c2 | 1429 | int ret; |
d41f73b7 | 1430 | |
6f9449c2 JG |
1431 | ret = extract_common_subbuffer_info(stream, subbuf); |
1432 | if (ret) { | |
1433 | goto end; | |
1434 | } | |
309167d2 | 1435 | |
6f9449c2 JG |
1436 | ret = kernctl_get_packet_size( |
1437 | stream->wait_fd, &subbuf->info.data.packet_size); | |
1438 | if (ret < 0) { | |
1439 | PERROR("Failed to get sub-buffer packet size"); | |
1440 | goto end; | |
1441 | } | |
02d02e31 | 1442 | |
6f9449c2 JG |
1443 | ret = kernctl_get_content_size( |
1444 | stream->wait_fd, &subbuf->info.data.content_size); | |
1445 | if (ret < 0) { | |
1446 | PERROR("Failed to get sub-buffer content size"); | |
1447 | goto end; | |
d41f73b7 MD |
1448 | } |
1449 | ||
6f9449c2 JG |
1450 | ret = kernctl_get_timestamp_begin( |
1451 | stream->wait_fd, &subbuf->info.data.timestamp_begin); | |
1452 | if (ret < 0) { | |
1453 | PERROR("Failed to get sub-buffer begin timestamp"); | |
1454 | goto end; | |
1d4dfdef DG |
1455 | } |
1456 | ||
6f9449c2 JG |
1457 | ret = kernctl_get_timestamp_end( |
1458 | stream->wait_fd, &subbuf->info.data.timestamp_end); | |
1459 | if (ret < 0) { | |
1460 | PERROR("Failed to get sub-buffer end timestamp"); | |
1461 | goto end; | |
1462 | } | |
1463 | ||
1464 | ret = kernctl_get_events_discarded( | |
1465 | stream->wait_fd, &subbuf->info.data.events_discarded); | |
1466 | if (ret) { | |
1467 | PERROR("Failed to get sub-buffer events discarded count"); | |
1468 | goto end; | |
1469 | } | |
1470 | ||
1471 | ret = kernctl_get_sequence_number(stream->wait_fd, | |
1472 | &subbuf->info.data.sequence_number.value); | |
1473 | if (ret) { | |
1474 | /* May not be supported by older LTTng-modules. */ | |
1475 | if (ret != -ENOTTY) { | |
1476 | PERROR("Failed to get sub-buffer sequence number"); | |
1477 | goto end; | |
fb83fe64 | 1478 | } |
1c20f0e2 | 1479 | } else { |
6f9449c2 | 1480 | subbuf->info.data.sequence_number.is_set = true; |
309167d2 JD |
1481 | } |
1482 | ||
6f9449c2 JG |
1483 | ret = kernctl_get_stream_id( |
1484 | stream->wait_fd, &subbuf->info.data.stream_id); | |
1485 | if (ret < 0) { | |
1486 | PERROR("Failed to get stream id"); | |
1487 | goto end; | |
1488 | } | |
1d4dfdef | 1489 | |
6f9449c2 JG |
1490 | ret = kernctl_get_instance_id(stream->wait_fd, |
1491 | &subbuf->info.data.stream_instance_id.value); | |
1492 | if (ret) { | |
1493 | /* May not be supported by older LTTng-modules. */ | |
1494 | if (ret != -ENOTTY) { | |
1495 | PERROR("Failed to get stream instance id"); | |
1496 | goto end; | |
1d4dfdef | 1497 | } |
6f9449c2 JG |
1498 | } else { |
1499 | subbuf->info.data.stream_instance_id.is_set = true; | |
1500 | } | |
1501 | end: | |
1502 | return ret; | |
1503 | } | |
47e81c02 | 1504 | |
6f9449c2 JG |
1505 | static |
1506 | int get_subbuffer_common(struct lttng_consumer_stream *stream, | |
1507 | struct stream_subbuffer *subbuffer) | |
1508 | { | |
1509 | int ret; | |
1510 | ||
1511 | ret = kernctl_get_next_subbuf(stream->wait_fd); | |
1512 | if (ret) { | |
1513 | goto end; | |
1514 | } | |
1515 | ||
1516 | ret = stream->read_subbuffer_ops.extract_subbuffer_info( | |
1517 | stream, subbuffer); | |
1518 | end: | |
1519 | return ret; | |
1520 | } | |
128708c3 | 1521 | |
6f9449c2 JG |
1522 | static |
1523 | int get_next_subbuffer_splice(struct lttng_consumer_stream *stream, | |
1524 | struct stream_subbuffer *subbuffer) | |
1525 | { | |
1526 | int ret; | |
1d4dfdef | 1527 | |
6f9449c2 JG |
1528 | ret = get_subbuffer_common(stream, subbuffer); |
1529 | if (ret) { | |
1530 | goto end; | |
1531 | } | |
1d4dfdef | 1532 | |
6f9449c2 JG |
1533 | subbuffer->buffer.fd = stream->wait_fd; |
1534 | end: | |
1535 | return ret; | |
1536 | } | |
fd424d99 | 1537 | |
6f9449c2 JG |
1538 | static |
1539 | int get_next_subbuffer_mmap(struct lttng_consumer_stream *stream, | |
1540 | struct stream_subbuffer *subbuffer) | |
1541 | { | |
1542 | int ret; | |
1543 | const char *addr; | |
1544 | ||
1545 | ret = get_subbuffer_common(stream, subbuffer); | |
1546 | if (ret) { | |
1547 | goto end; | |
128708c3 | 1548 | } |
6f9449c2 JG |
1549 | |
1550 | ret = get_current_subbuf_addr(stream, &addr); | |
1551 | if (ret) { | |
1552 | goto end; | |
d41f73b7 | 1553 | } |
6f9449c2 JG |
1554 | |
1555 | subbuffer->buffer.buffer = lttng_buffer_view_init( | |
1556 | addr, 0, subbuffer->info.data.padded_subbuf_size); | |
1557 | end: | |
1558 | return ret; | |
1559 | } | |
1560 | ||
1561 | static | |
1562 | int put_next_subbuffer(struct lttng_consumer_stream *stream, | |
1563 | struct stream_subbuffer *subbuffer) | |
1564 | { | |
1565 | const int ret = kernctl_put_next_subbuf(stream->wait_fd); | |
1566 | ||
1567 | if (ret) { | |
1568 | if (ret == -EFAULT) { | |
1569 | PERROR("Error in unreserving sub buffer"); | |
1570 | } else if (ret == -EIO) { | |
d41f73b7 | 1571 | /* Should never happen with newer LTTng versions */ |
6f9449c2 | 1572 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted"); |
d41f73b7 | 1573 | } |
d41f73b7 MD |
1574 | } |
1575 | ||
6f9449c2 JG |
1576 | return ret; |
1577 | } | |
1c20f0e2 | 1578 | |
6f9449c2 JG |
1579 | static void lttng_kconsumer_set_stream_ops( |
1580 | struct lttng_consumer_stream *stream) | |
1581 | { | |
1582 | if (stream->chan->output == CONSUMER_CHANNEL_MMAP) { | |
1583 | stream->read_subbuffer_ops.get_next_subbuffer = | |
1584 | get_next_subbuffer_mmap; | |
1585 | } else { | |
1586 | stream->read_subbuffer_ops.get_next_subbuffer = | |
1587 | get_next_subbuffer_splice; | |
94d49140 JD |
1588 | } |
1589 | ||
6f9449c2 JG |
1590 | if (stream->metadata_flag) { |
1591 | stream->read_subbuffer_ops.extract_subbuffer_info = | |
1592 | extract_metadata_subbuffer_info; | |
1593 | } else { | |
1594 | stream->read_subbuffer_ops.extract_subbuffer_info = | |
1595 | extract_data_subbuffer_info; | |
1596 | if (stream->chan->is_live) { | |
1597 | stream->read_subbuffer_ops.send_live_beacon = | |
1598 | consumer_flush_kernel_index; | |
1599 | } | |
309167d2 JD |
1600 | } |
1601 | ||
6f9449c2 | 1602 | stream->read_subbuffer_ops.put_next_subbuffer = put_next_subbuffer; |
d41f73b7 MD |
1603 | } |
1604 | ||
1605 | int lttng_kconsumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
1606 | { | |
1607 | int ret; | |
ffe60014 DG |
1608 | |
1609 | assert(stream); | |
1610 | ||
2bba9e53 | 1611 | /* |
d2956687 JG |
1612 | * Don't create anything if this is set for streaming or if there is |
1613 | * no current trace chunk on the parent channel. | |
2bba9e53 | 1614 | */ |
d2956687 JG |
1615 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor && |
1616 | stream->chan->trace_chunk) { | |
1617 | ret = consumer_stream_create_output_files(stream, true); | |
1618 | if (ret) { | |
fe4477ee JD |
1619 | goto error; |
1620 | } | |
ffe60014 | 1621 | } |
d41f73b7 | 1622 | |
d41f73b7 MD |
1623 | if (stream->output == LTTNG_EVENT_MMAP) { |
1624 | /* get the len of the mmap region */ | |
1625 | unsigned long mmap_len; | |
1626 | ||
1627 | ret = kernctl_get_mmap_len(stream->wait_fd, &mmap_len); | |
1628 | if (ret != 0) { | |
ffe60014 | 1629 | PERROR("kernctl_get_mmap_len"); |
d41f73b7 MD |
1630 | goto error_close_fd; |
1631 | } | |
1632 | stream->mmap_len = (size_t) mmap_len; | |
1633 | ||
ffe60014 DG |
1634 | stream->mmap_base = mmap(NULL, stream->mmap_len, PROT_READ, |
1635 | MAP_PRIVATE, stream->wait_fd, 0); | |
d41f73b7 | 1636 | if (stream->mmap_base == MAP_FAILED) { |
ffe60014 | 1637 | PERROR("Error mmaping"); |
d41f73b7 MD |
1638 | ret = -1; |
1639 | goto error_close_fd; | |
1640 | } | |
1641 | } | |
1642 | ||
6f9449c2 JG |
1643 | lttng_kconsumer_set_stream_ops(stream); |
1644 | ||
d41f73b7 MD |
1645 | /* we return 0 to let the library handle the FD internally */ |
1646 | return 0; | |
1647 | ||
1648 | error_close_fd: | |
2f225ce2 | 1649 | if (stream->out_fd >= 0) { |
d41f73b7 MD |
1650 | int err; |
1651 | ||
1652 | err = close(stream->out_fd); | |
1653 | assert(!err); | |
2f225ce2 | 1654 | stream->out_fd = -1; |
d41f73b7 MD |
1655 | } |
1656 | error: | |
1657 | return ret; | |
1658 | } | |
1659 | ||
ca22feea DG |
1660 | /* |
1661 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
1662 | * stream. Consumer data lock MUST be acquired before calling this function |
1663 | * and the stream lock. | |
ca22feea | 1664 | * |
6d805429 | 1665 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
1666 | * data is available for trace viewer reading. |
1667 | */ | |
6d805429 | 1668 | int lttng_kconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
1669 | { |
1670 | int ret; | |
1671 | ||
1672 | assert(stream); | |
1673 | ||
873b9e9a MD |
1674 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
1675 | ret = 0; | |
1676 | goto end; | |
1677 | } | |
1678 | ||
ca22feea DG |
1679 | ret = kernctl_get_next_subbuf(stream->wait_fd); |
1680 | if (ret == 0) { | |
1681 | /* There is still data so let's put back this subbuffer. */ | |
1682 | ret = kernctl_put_subbuf(stream->wait_fd); | |
1683 | assert(ret == 0); | |
6d805429 | 1684 | ret = 1; /* Data is pending */ |
4e9a4686 | 1685 | goto end; |
ca22feea DG |
1686 | } |
1687 | ||
6d805429 DG |
1688 | /* Data is NOT pending and ready to be read. */ |
1689 | ret = 0; | |
ca22feea | 1690 | |
6efae65e DG |
1691 | end: |
1692 | return ret; | |
ca22feea | 1693 | } |