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> |
e426953d | 22 | #include <stdint.h> |
3bd1e081 | 23 | |
51a9e1c7 | 24 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 25 | #include <common/common.h> |
10a8a223 | 26 | #include <common/kernel-ctl/kernel-ctl.h> |
10a8a223 | 27 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 28 | #include <common/sessiond-comm/relayd.h> |
dbb5dfe6 | 29 | #include <common/compat/fcntl.h> |
f263b7fd | 30 | #include <common/compat/endian.h> |
acdb9057 | 31 | #include <common/pipe.h> |
00e2e675 | 32 | #include <common/relayd/relayd.h> |
fe4477ee | 33 | #include <common/utils.h> |
c8fea79c | 34 | #include <common/consumer/consumer-stream.h> |
309167d2 | 35 | #include <common/index/index.h> |
c8fea79c | 36 | #include <common/consumer/consumer-timer.h> |
d2956687 | 37 | #include <common/optional.h> |
bdc8d1bb JG |
38 | #include <common/buffer-view.h> |
39 | #include <common/consumer/consumer.h> | |
e426953d | 40 | #include <common/consumer/metadata-bucket.h> |
0857097f | 41 | |
10a8a223 | 42 | #include "kernel-consumer.h" |
3bd1e081 MD |
43 | |
44 | extern struct lttng_consumer_global_data consumer_data; | |
45 | extern int consumer_poll_timeout; | |
3bd1e081 | 46 | |
3bd1e081 MD |
47 | /* |
48 | * Take a snapshot for a specific fd | |
49 | * | |
50 | * Returns 0 on success, < 0 on error | |
51 | */ | |
ffe60014 | 52 | int lttng_kconsumer_take_snapshot(struct lttng_consumer_stream *stream) |
3bd1e081 MD |
53 | { |
54 | int ret = 0; | |
55 | int infd = stream->wait_fd; | |
56 | ||
57 | ret = kernctl_snapshot(infd); | |
d2d2f190 JD |
58 | /* |
59 | * -EAGAIN is not an error, it just means that there is no data to | |
60 | * be read. | |
61 | */ | |
62 | if (ret != 0 && ret != -EAGAIN) { | |
5a510c9f | 63 | PERROR("Getting sub-buffer snapshot."); |
3bd1e081 MD |
64 | } |
65 | ||
66 | return ret; | |
67 | } | |
68 | ||
e9404c27 JG |
69 | /* |
70 | * Sample consumed and produced positions for a specific fd. | |
71 | * | |
72 | * Returns 0 on success, < 0 on error. | |
73 | */ | |
74 | int lttng_kconsumer_sample_snapshot_positions( | |
75 | struct lttng_consumer_stream *stream) | |
76 | { | |
77 | assert(stream); | |
78 | ||
79 | return kernctl_snapshot_sample_positions(stream->wait_fd); | |
80 | } | |
81 | ||
3bd1e081 MD |
82 | /* |
83 | * Get the produced position | |
84 | * | |
85 | * Returns 0 on success, < 0 on error | |
86 | */ | |
ffe60014 | 87 | int lttng_kconsumer_get_produced_snapshot(struct lttng_consumer_stream *stream, |
3bd1e081 MD |
88 | unsigned long *pos) |
89 | { | |
90 | int ret; | |
91 | int infd = stream->wait_fd; | |
92 | ||
93 | ret = kernctl_snapshot_get_produced(infd, pos); | |
94 | if (ret != 0) { | |
5a510c9f | 95 | PERROR("kernctl_snapshot_get_produced"); |
3bd1e081 MD |
96 | } |
97 | ||
98 | return ret; | |
99 | } | |
100 | ||
07b86b52 JD |
101 | /* |
102 | * Get the consumerd position | |
103 | * | |
104 | * Returns 0 on success, < 0 on error | |
105 | */ | |
106 | int lttng_kconsumer_get_consumed_snapshot(struct lttng_consumer_stream *stream, | |
107 | unsigned long *pos) | |
108 | { | |
109 | int ret; | |
110 | int infd = stream->wait_fd; | |
111 | ||
112 | ret = kernctl_snapshot_get_consumed(infd, pos); | |
113 | if (ret != 0) { | |
5a510c9f | 114 | PERROR("kernctl_snapshot_get_consumed"); |
07b86b52 JD |
115 | } |
116 | ||
117 | return ret; | |
118 | } | |
119 | ||
276cd1d7 JG |
120 | static |
121 | int get_current_subbuf_addr(struct lttng_consumer_stream *stream, | |
122 | const char **addr) | |
123 | { | |
124 | int ret; | |
125 | unsigned long mmap_offset; | |
126 | const char *mmap_base = stream->mmap_base; | |
127 | ||
128 | ret = kernctl_get_mmap_read_offset(stream->wait_fd, &mmap_offset); | |
129 | if (ret < 0) { | |
130 | PERROR("Failed to get mmap read offset"); | |
131 | goto error; | |
132 | } | |
133 | ||
134 | *addr = mmap_base + mmap_offset; | |
135 | error: | |
136 | return ret; | |
137 | } | |
138 | ||
07b86b52 JD |
139 | /* |
140 | * Take a snapshot of all the stream of a channel | |
3eb928aa | 141 | * RCU read-side lock must be held across this function to ensure existence of |
8aaed9e7 | 142 | * channel. |
07b86b52 JD |
143 | * |
144 | * Returns 0 on success, < 0 on error | |
145 | */ | |
f72bb42f JG |
146 | static int lttng_kconsumer_snapshot_channel( |
147 | struct lttng_consumer_channel *channel, | |
148 | uint64_t key, char *path, uint64_t relayd_id, | |
149 | uint64_t nb_packets_per_stream, | |
5c786ded | 150 | struct lttng_consumer_local_data *ctx) |
07b86b52 JD |
151 | { |
152 | int ret; | |
07b86b52 JD |
153 | struct lttng_consumer_stream *stream; |
154 | ||
6a00837f | 155 | DBG("Kernel consumer snapshot channel %" PRIu64, key); |
07b86b52 | 156 | |
8aaed9e7 JR |
157 | /* Prevent channel modifications while we perform the snapshot.*/ |
158 | pthread_mutex_lock(&channel->lock); | |
159 | ||
07b86b52 JD |
160 | rcu_read_lock(); |
161 | ||
07b86b52 JD |
162 | /* Splice is not supported yet for channel snapshot. */ |
163 | if (channel->output != CONSUMER_CHANNEL_MMAP) { | |
9381314c JG |
164 | ERR("Unsupported output type for channel \"%s\": mmap output is required to record a snapshot", |
165 | channel->name); | |
07b86b52 JD |
166 | ret = -1; |
167 | goto end; | |
168 | } | |
169 | ||
10a50311 | 170 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { |
923333cd | 171 | unsigned long consumed_pos, produced_pos; |
9ce5646a MD |
172 | |
173 | health_code_update(); | |
174 | ||
07b86b52 JD |
175 | /* |
176 | * Lock stream because we are about to change its state. | |
177 | */ | |
178 | pthread_mutex_lock(&stream->lock); | |
179 | ||
d2956687 JG |
180 | assert(channel->trace_chunk); |
181 | if (!lttng_trace_chunk_get(channel->trace_chunk)) { | |
182 | /* | |
183 | * Can't happen barring an internal error as the channel | |
184 | * holds a reference to the trace chunk. | |
185 | */ | |
186 | ERR("Failed to acquire reference to channel's trace chunk"); | |
187 | ret = -1; | |
188 | goto end_unlock; | |
189 | } | |
190 | assert(!stream->trace_chunk); | |
191 | stream->trace_chunk = channel->trace_chunk; | |
192 | ||
29decac3 DG |
193 | /* |
194 | * Assign the received relayd ID so we can use it for streaming. The streams | |
195 | * are not visible to anyone so this is OK to change it. | |
196 | */ | |
07b86b52 JD |
197 | stream->net_seq_idx = relayd_id; |
198 | channel->relayd_id = relayd_id; | |
199 | if (relayd_id != (uint64_t) -1ULL) { | |
10a50311 | 200 | ret = consumer_send_relayd_stream(stream, path); |
07b86b52 JD |
201 | if (ret < 0) { |
202 | ERR("sending stream to relayd"); | |
203 | goto end_unlock; | |
204 | } | |
07b86b52 | 205 | } else { |
d2956687 JG |
206 | ret = consumer_stream_create_output_files(stream, |
207 | false); | |
07b86b52 | 208 | if (ret < 0) { |
07b86b52 JD |
209 | goto end_unlock; |
210 | } | |
d2956687 JG |
211 | DBG("Kernel consumer snapshot stream (%" PRIu64 ")", |
212 | stream->key); | |
07b86b52 JD |
213 | } |
214 | ||
f22dd891 | 215 | ret = kernctl_buffer_flush_empty(stream->wait_fd); |
07b86b52 | 216 | if (ret < 0) { |
f22dd891 MD |
217 | /* |
218 | * Doing a buffer flush which does not take into | |
219 | * account empty packets. This is not perfect | |
220 | * for stream intersection, but required as a | |
221 | * fall-back when "flush_empty" is not | |
222 | * implemented by lttng-modules. | |
223 | */ | |
224 | ret = kernctl_buffer_flush(stream->wait_fd); | |
225 | if (ret < 0) { | |
226 | ERR("Failed to flush kernel stream"); | |
227 | goto end_unlock; | |
228 | } | |
07b86b52 JD |
229 | goto end_unlock; |
230 | } | |
231 | ||
232 | ret = lttng_kconsumer_take_snapshot(stream); | |
233 | if (ret < 0) { | |
234 | ERR("Taking kernel snapshot"); | |
235 | goto end_unlock; | |
236 | } | |
237 | ||
238 | ret = lttng_kconsumer_get_produced_snapshot(stream, &produced_pos); | |
239 | if (ret < 0) { | |
240 | ERR("Produced kernel snapshot position"); | |
241 | goto end_unlock; | |
242 | } | |
243 | ||
244 | ret = lttng_kconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
245 | if (ret < 0) { | |
246 | ERR("Consumerd kernel snapshot position"); | |
247 | goto end_unlock; | |
248 | } | |
249 | ||
d07ceecd MD |
250 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
251 | produced_pos, nb_packets_per_stream, | |
252 | stream->max_sb_size); | |
5c786ded | 253 | |
9377d830 | 254 | while ((long) (consumed_pos - produced_pos) < 0) { |
07b86b52 JD |
255 | ssize_t read_len; |
256 | unsigned long len, padded_len; | |
276cd1d7 | 257 | const char *subbuf_addr; |
a587bd64 | 258 | struct lttng_buffer_view subbuf_view; |
07b86b52 | 259 | |
9ce5646a | 260 | health_code_update(); |
07b86b52 JD |
261 | DBG("Kernel consumer taking snapshot at pos %lu", consumed_pos); |
262 | ||
263 | ret = kernctl_get_subbuf(stream->wait_fd, &consumed_pos); | |
264 | if (ret < 0) { | |
32af2c95 | 265 | if (ret != -EAGAIN) { |
07b86b52 JD |
266 | PERROR("kernctl_get_subbuf snapshot"); |
267 | goto end_unlock; | |
268 | } | |
269 | DBG("Kernel consumer get subbuf failed. Skipping it."); | |
270 | consumed_pos += stream->max_sb_size; | |
ddc93ee4 | 271 | stream->chan->lost_packets++; |
07b86b52 JD |
272 | continue; |
273 | } | |
274 | ||
275 | ret = kernctl_get_subbuf_size(stream->wait_fd, &len); | |
276 | if (ret < 0) { | |
277 | ERR("Snapshot kernctl_get_subbuf_size"); | |
29decac3 | 278 | goto error_put_subbuf; |
07b86b52 JD |
279 | } |
280 | ||
281 | ret = kernctl_get_padded_subbuf_size(stream->wait_fd, &padded_len); | |
282 | if (ret < 0) { | |
283 | ERR("Snapshot kernctl_get_padded_subbuf_size"); | |
29decac3 | 284 | goto error_put_subbuf; |
07b86b52 JD |
285 | } |
286 | ||
276cd1d7 JG |
287 | ret = get_current_subbuf_addr(stream, &subbuf_addr); |
288 | if (ret) { | |
289 | goto error_put_subbuf; | |
290 | } | |
291 | ||
a587bd64 JG |
292 | subbuf_view = lttng_buffer_view_init( |
293 | subbuf_addr, 0, padded_len); | |
e426953d | 294 | read_len = lttng_consumer_on_read_subbuffer_mmap( |
a587bd64 | 295 | stream, &subbuf_view, |
bdc8d1bb | 296 | padded_len - len); |
07b86b52 | 297 | /* |
29decac3 DG |
298 | * We write the padded len in local tracefiles but the data len |
299 | * when using a relay. Display the error but continue processing | |
300 | * to try to release the subbuffer. | |
07b86b52 JD |
301 | */ |
302 | if (relayd_id != (uint64_t) -1ULL) { | |
303 | if (read_len != len) { | |
304 | ERR("Error sending to the relay (ret: %zd != len: %lu)", | |
305 | read_len, len); | |
306 | } | |
307 | } else { | |
308 | if (read_len != padded_len) { | |
309 | ERR("Error writing to tracefile (ret: %zd != len: %lu)", | |
310 | read_len, padded_len); | |
311 | } | |
312 | } | |
313 | ||
314 | ret = kernctl_put_subbuf(stream->wait_fd); | |
315 | if (ret < 0) { | |
316 | ERR("Snapshot kernctl_put_subbuf"); | |
317 | goto end_unlock; | |
318 | } | |
319 | consumed_pos += stream->max_sb_size; | |
320 | } | |
321 | ||
322 | if (relayd_id == (uint64_t) -1ULL) { | |
fdf9986c MD |
323 | if (stream->out_fd >= 0) { |
324 | ret = close(stream->out_fd); | |
325 | if (ret < 0) { | |
326 | PERROR("Kernel consumer snapshot close out_fd"); | |
327 | goto end_unlock; | |
328 | } | |
329 | stream->out_fd = -1; | |
07b86b52 | 330 | } |
07b86b52 JD |
331 | } else { |
332 | close_relayd_stream(stream); | |
333 | stream->net_seq_idx = (uint64_t) -1ULL; | |
334 | } | |
d2956687 JG |
335 | lttng_trace_chunk_put(stream->trace_chunk); |
336 | stream->trace_chunk = NULL; | |
07b86b52 JD |
337 | pthread_mutex_unlock(&stream->lock); |
338 | } | |
339 | ||
340 | /* All good! */ | |
341 | ret = 0; | |
342 | goto end; | |
343 | ||
29decac3 DG |
344 | error_put_subbuf: |
345 | ret = kernctl_put_subbuf(stream->wait_fd); | |
346 | if (ret < 0) { | |
347 | ERR("Snapshot kernctl_put_subbuf error path"); | |
348 | } | |
07b86b52 JD |
349 | end_unlock: |
350 | pthread_mutex_unlock(&stream->lock); | |
351 | end: | |
352 | rcu_read_unlock(); | |
8aaed9e7 | 353 | pthread_mutex_unlock(&channel->lock); |
07b86b52 JD |
354 | return ret; |
355 | } | |
356 | ||
357 | /* | |
358 | * Read the whole metadata available for a snapshot. | |
3eb928aa | 359 | * RCU read-side lock must be held across this function to ensure existence of |
8aaed9e7 | 360 | * metadata_channel. |
07b86b52 JD |
361 | * |
362 | * Returns 0 on success, < 0 on error | |
363 | */ | |
d2956687 JG |
364 | static int lttng_kconsumer_snapshot_metadata( |
365 | struct lttng_consumer_channel *metadata_channel, | |
3eb928aa MD |
366 | uint64_t key, char *path, uint64_t relayd_id, |
367 | struct lttng_consumer_local_data *ctx) | |
07b86b52 | 368 | { |
d771f832 DG |
369 | int ret, use_relayd = 0; |
370 | ssize_t ret_read; | |
07b86b52 | 371 | struct lttng_consumer_stream *metadata_stream; |
d771f832 DG |
372 | |
373 | assert(ctx); | |
07b86b52 JD |
374 | |
375 | DBG("Kernel consumer snapshot metadata with key %" PRIu64 " at path %s", | |
376 | key, path); | |
377 | ||
378 | rcu_read_lock(); | |
379 | ||
07b86b52 JD |
380 | metadata_stream = metadata_channel->metadata_stream; |
381 | assert(metadata_stream); | |
d2956687 | 382 | |
8aaed9e7 JR |
383 | /* Take all the appropriate locks hehehe.*/ |
384 | metadata_stream->read_subbuffer_ops.lock(metadata_stream); | |
d2956687 JG |
385 | assert(metadata_channel->trace_chunk); |
386 | assert(metadata_stream->trace_chunk); | |
07b86b52 | 387 | |
d771f832 | 388 | /* Flag once that we have a valid relayd for the stream. */ |
e2039c7a | 389 | if (relayd_id != (uint64_t) -1ULL) { |
d771f832 DG |
390 | use_relayd = 1; |
391 | } | |
392 | ||
393 | if (use_relayd) { | |
10a50311 | 394 | ret = consumer_send_relayd_stream(metadata_stream, path); |
e2039c7a | 395 | if (ret < 0) { |
fa27abe8 | 396 | goto error_snapshot; |
e2039c7a | 397 | } |
e2039c7a | 398 | } else { |
d2956687 JG |
399 | ret = consumer_stream_create_output_files(metadata_stream, |
400 | false); | |
e2039c7a | 401 | if (ret < 0) { |
fa27abe8 | 402 | goto error_snapshot; |
e2039c7a | 403 | } |
07b86b52 | 404 | } |
07b86b52 | 405 | |
d771f832 | 406 | do { |
9ce5646a MD |
407 | health_code_update(); |
408 | ||
bdc8d1bb | 409 | ret_read = lttng_consumer_read_subbuffer(metadata_stream, ctx, true); |
d771f832 | 410 | if (ret_read < 0) { |
bc93eeca MD |
411 | ERR("Kernel snapshot reading metadata subbuffer (ret: %zd)", |
412 | ret_read); | |
413 | ret = ret_read; | |
414 | goto error_snapshot; | |
07b86b52 | 415 | } |
bc93eeca | 416 | } while (ret_read > 0); |
07b86b52 | 417 | |
d771f832 DG |
418 | if (use_relayd) { |
419 | close_relayd_stream(metadata_stream); | |
420 | metadata_stream->net_seq_idx = (uint64_t) -1ULL; | |
421 | } else { | |
fdf9986c MD |
422 | if (metadata_stream->out_fd >= 0) { |
423 | ret = close(metadata_stream->out_fd); | |
424 | if (ret < 0) { | |
425 | PERROR("Kernel consumer snapshot metadata close out_fd"); | |
426 | /* | |
427 | * Don't go on error here since the snapshot was successful at this | |
428 | * point but somehow the close failed. | |
429 | */ | |
430 | } | |
431 | metadata_stream->out_fd = -1; | |
d2956687 JG |
432 | lttng_trace_chunk_put(metadata_stream->trace_chunk); |
433 | metadata_stream->trace_chunk = NULL; | |
e2039c7a | 434 | } |
e2039c7a JD |
435 | } |
436 | ||
07b86b52 | 437 | ret = 0; |
fa27abe8 | 438 | error_snapshot: |
8aaed9e7 | 439 | metadata_stream->read_subbuffer_ops.unlock(metadata_stream); |
cf53a8a6 JD |
440 | cds_list_del(&metadata_stream->send_node); |
441 | consumer_stream_destroy(metadata_stream, NULL); | |
442 | metadata_channel->metadata_stream = NULL; | |
07b86b52 JD |
443 | rcu_read_unlock(); |
444 | return ret; | |
445 | } | |
446 | ||
1803a064 MD |
447 | /* |
448 | * Receive command from session daemon and process it. | |
449 | * | |
450 | * Return 1 on success else a negative value or 0. | |
451 | */ | |
3bd1e081 MD |
452 | int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
453 | int sock, struct pollfd *consumer_sockpoll) | |
454 | { | |
455 | ssize_t ret; | |
0c759fc9 | 456 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 MD |
457 | struct lttcomm_consumer_msg msg; |
458 | ||
9ce5646a MD |
459 | health_code_update(); |
460 | ||
3bd1e081 MD |
461 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
462 | if (ret != sizeof(msg)) { | |
1803a064 | 463 | if (ret > 0) { |
c6857fcf | 464 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
1803a064 MD |
465 | ret = -1; |
466 | } | |
3bd1e081 MD |
467 | return ret; |
468 | } | |
9ce5646a MD |
469 | |
470 | health_code_update(); | |
471 | ||
84382d49 MD |
472 | /* Deprecated command */ |
473 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 474 | |
9ce5646a MD |
475 | health_code_update(); |
476 | ||
b0b335c8 MD |
477 | /* relayd needs RCU read-side protection */ |
478 | rcu_read_lock(); | |
479 | ||
3bd1e081 | 480 | switch (msg.cmd_type) { |
00e2e675 DG |
481 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
482 | { | |
f50f23d9 | 483 | /* Session daemon status message are handled in the following call. */ |
2527bf85 | 484 | consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
7735ef9e | 485 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, |
d3e2ba59 | 486 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
2527bf85 | 487 | msg.u.relayd_sock.relayd_session_id); |
00e2e675 DG |
488 | goto end_nosignal; |
489 | } | |
3bd1e081 MD |
490 | case LTTNG_CONSUMER_ADD_CHANNEL: |
491 | { | |
492 | struct lttng_consumer_channel *new_channel; | |
e43c41c5 | 493 | int ret_recv; |
d2956687 | 494 | const uint64_t chunk_id = msg.u.channel.chunk_id.value; |
3bd1e081 | 495 | |
9ce5646a MD |
496 | health_code_update(); |
497 | ||
f50f23d9 DG |
498 | /* First send a status message before receiving the fds. */ |
499 | ret = consumer_send_status_msg(sock, ret_code); | |
500 | if (ret < 0) { | |
501 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 502 | goto error_fatal; |
f50f23d9 | 503 | } |
9ce5646a MD |
504 | |
505 | health_code_update(); | |
506 | ||
d88aee68 | 507 | DBG("consumer_add_channel %" PRIu64, msg.u.channel.channel_key); |
3bd1e081 | 508 | new_channel = consumer_allocate_channel(msg.u.channel.channel_key, |
d2956687 JG |
509 | msg.u.channel.session_id, |
510 | msg.u.channel.chunk_id.is_set ? | |
511 | &chunk_id : NULL, | |
512 | msg.u.channel.pathname, | |
513 | msg.u.channel.name, | |
1624d5b7 JD |
514 | msg.u.channel.relayd_id, msg.u.channel.output, |
515 | msg.u.channel.tracefile_size, | |
1950109e | 516 | msg.u.channel.tracefile_count, 0, |
ecc48a90 | 517 | msg.u.channel.monitor, |
d7ba1388 | 518 | msg.u.channel.live_timer_interval, |
ee8935c3 | 519 | msg.u.channel.is_live, |
3d071855 | 520 | NULL, NULL); |
3bd1e081 | 521 | if (new_channel == NULL) { |
f73fabfd | 522 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
3bd1e081 MD |
523 | goto end_nosignal; |
524 | } | |
ffe60014 | 525 | new_channel->nb_init_stream_left = msg.u.channel.nb_init_streams; |
95a1109b JD |
526 | switch (msg.u.channel.output) { |
527 | case LTTNG_EVENT_SPLICE: | |
528 | new_channel->output = CONSUMER_CHANNEL_SPLICE; | |
529 | break; | |
530 | case LTTNG_EVENT_MMAP: | |
531 | new_channel->output = CONSUMER_CHANNEL_MMAP; | |
532 | break; | |
533 | default: | |
534 | ERR("Channel output unknown %d", msg.u.channel.output); | |
535 | goto end_nosignal; | |
536 | } | |
ffe60014 DG |
537 | |
538 | /* Translate and save channel type. */ | |
539 | switch (msg.u.channel.type) { | |
540 | case CONSUMER_CHANNEL_TYPE_DATA: | |
541 | case CONSUMER_CHANNEL_TYPE_METADATA: | |
542 | new_channel->type = msg.u.channel.type; | |
543 | break; | |
544 | default: | |
545 | assert(0); | |
546 | goto end_nosignal; | |
547 | }; | |
548 | ||
9ce5646a MD |
549 | health_code_update(); |
550 | ||
3bd1e081 | 551 | if (ctx->on_recv_channel != NULL) { |
e43c41c5 JD |
552 | ret_recv = ctx->on_recv_channel(new_channel); |
553 | if (ret_recv == 0) { | |
554 | ret = consumer_add_channel(new_channel, ctx); | |
555 | } else if (ret_recv < 0) { | |
3bd1e081 MD |
556 | goto end_nosignal; |
557 | } | |
558 | } else { | |
e43c41c5 | 559 | ret = consumer_add_channel(new_channel, ctx); |
3bd1e081 | 560 | } |
e9404c27 JG |
561 | if (msg.u.channel.type == CONSUMER_CHANNEL_TYPE_DATA && !ret) { |
562 | int monitor_start_ret; | |
563 | ||
564 | DBG("Consumer starting monitor timer"); | |
94d49140 JD |
565 | consumer_timer_live_start(new_channel, |
566 | msg.u.channel.live_timer_interval); | |
e9404c27 JG |
567 | monitor_start_ret = consumer_timer_monitor_start( |
568 | new_channel, | |
569 | msg.u.channel.monitor_timer_interval); | |
570 | if (monitor_start_ret < 0) { | |
571 | ERR("Starting channel monitoring timer failed"); | |
572 | goto end_nosignal; | |
573 | } | |
574 | ||
94d49140 | 575 | } |
e43c41c5 | 576 | |
9ce5646a MD |
577 | health_code_update(); |
578 | ||
e43c41c5 | 579 | /* If we received an error in add_channel, we need to report it. */ |
821fffb2 | 580 | if (ret < 0) { |
1803a064 MD |
581 | ret = consumer_send_status_msg(sock, ret); |
582 | if (ret < 0) { | |
583 | goto error_fatal; | |
584 | } | |
e43c41c5 JD |
585 | goto end_nosignal; |
586 | } | |
587 | ||
3bd1e081 MD |
588 | goto end_nosignal; |
589 | } | |
590 | case LTTNG_CONSUMER_ADD_STREAM: | |
591 | { | |
dae10966 DG |
592 | int fd; |
593 | struct lttng_pipe *stream_pipe; | |
00e2e675 | 594 | struct lttng_consumer_stream *new_stream; |
ffe60014 | 595 | struct lttng_consumer_channel *channel; |
c80048c6 | 596 | int alloc_ret = 0; |
3bd1e081 | 597 | |
ffe60014 DG |
598 | /* |
599 | * Get stream's channel reference. Needed when adding the stream to the | |
600 | * global hash table. | |
601 | */ | |
602 | channel = consumer_find_channel(msg.u.stream.channel_key); | |
603 | if (!channel) { | |
604 | /* | |
605 | * We could not find the channel. Can happen if cpu hotplug | |
606 | * happens while tearing down. | |
607 | */ | |
d88aee68 | 608 | ERR("Unable to find channel key %" PRIu64, msg.u.stream.channel_key); |
e462382a | 609 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
ffe60014 DG |
610 | } |
611 | ||
9ce5646a MD |
612 | health_code_update(); |
613 | ||
f50f23d9 DG |
614 | /* First send a status message before receiving the fds. */ |
615 | ret = consumer_send_status_msg(sock, ret_code); | |
1803a064 | 616 | if (ret < 0) { |
d771f832 | 617 | /* Somehow, the session daemon is not responding anymore. */ |
c5c7998f | 618 | goto error_add_stream_fatal; |
1803a064 | 619 | } |
9ce5646a MD |
620 | |
621 | health_code_update(); | |
622 | ||
0c759fc9 | 623 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
d771f832 | 624 | /* Channel was not found. */ |
c5c7998f | 625 | goto error_add_stream_nosignal; |
f50f23d9 DG |
626 | } |
627 | ||
d771f832 | 628 | /* Blocking call */ |
9ce5646a MD |
629 | health_poll_entry(); |
630 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
631 | health_poll_exit(); | |
84382d49 | 632 | if (ret) { |
c5c7998f | 633 | goto error_add_stream_fatal; |
3bd1e081 | 634 | } |
00e2e675 | 635 | |
9ce5646a MD |
636 | health_code_update(); |
637 | ||
00e2e675 | 638 | /* Get stream file descriptor from socket */ |
f2fc6720 MD |
639 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); |
640 | if (ret != sizeof(fd)) { | |
f73fabfd | 641 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
c5c7998f | 642 | goto end; |
3bd1e081 | 643 | } |
3bd1e081 | 644 | |
9ce5646a MD |
645 | health_code_update(); |
646 | ||
f50f23d9 DG |
647 | /* |
648 | * Send status code to session daemon only if the recv works. If the | |
649 | * above recv() failed, the session daemon is notified through the | |
650 | * error socket and the teardown is eventually done. | |
651 | */ | |
652 | ret = consumer_send_status_msg(sock, ret_code); | |
653 | if (ret < 0) { | |
654 | /* Somehow, the session daemon is not responding anymore. */ | |
c5c7998f | 655 | goto error_add_stream_nosignal; |
f50f23d9 DG |
656 | } |
657 | ||
9ce5646a MD |
658 | health_code_update(); |
659 | ||
d2956687 | 660 | pthread_mutex_lock(&channel->lock); |
bdc8d1bb | 661 | new_stream = consumer_stream_create( |
212cee3c JG |
662 | channel, |
663 | channel->key, | |
ffe60014 | 664 | fd, |
ffe60014 | 665 | channel->name, |
ffe60014 DG |
666 | channel->relayd_id, |
667 | channel->session_id, | |
d2956687 | 668 | channel->trace_chunk, |
ffe60014 DG |
669 | msg.u.stream.cpu, |
670 | &alloc_ret, | |
4891ece8 | 671 | channel->type, |
d2956687 | 672 | channel->monitor); |
3bd1e081 | 673 | if (new_stream == NULL) { |
c80048c6 MD |
674 | switch (alloc_ret) { |
675 | case -ENOMEM: | |
676 | case -EINVAL: | |
677 | default: | |
678 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
679 | break; | |
c80048c6 | 680 | } |
d2956687 | 681 | pthread_mutex_unlock(&channel->lock); |
c5c7998f | 682 | goto error_add_stream_nosignal; |
3bd1e081 | 683 | } |
d771f832 | 684 | |
ffe60014 | 685 | new_stream->wait_fd = fd; |
d05185fa JG |
686 | ret = kernctl_get_max_subbuf_size(new_stream->wait_fd, |
687 | &new_stream->max_sb_size); | |
688 | if (ret < 0) { | |
689 | pthread_mutex_unlock(&channel->lock); | |
690 | ERR("Failed to get kernel maximal subbuffer size"); | |
c5c7998f | 691 | goto error_add_stream_nosignal; |
d05185fa JG |
692 | } |
693 | ||
d9a2e16e JD |
694 | consumer_stream_update_channel_attributes(new_stream, |
695 | channel); | |
00e2e675 | 696 | |
a0c83db9 DG |
697 | /* |
698 | * We've just assigned the channel to the stream so increment the | |
07b86b52 JD |
699 | * refcount right now. We don't need to increment the refcount for |
700 | * streams in no monitor because we handle manually the cleanup of | |
701 | * those. It is very important to make sure there is NO prior | |
702 | * consumer_del_stream() calls or else the refcount will be unbalanced. | |
a0c83db9 | 703 | */ |
07b86b52 JD |
704 | if (channel->monitor) { |
705 | uatomic_inc(&new_stream->chan->refcount); | |
706 | } | |
9d9353f9 | 707 | |
fb3a43a9 DG |
708 | /* |
709 | * The buffer flush is done on the session daemon side for the kernel | |
710 | * so no need for the stream "hangup_flush_done" variable to be | |
711 | * tracked. This is important for a kernel stream since we don't rely | |
712 | * on the flush state of the stream to read data. It's not the case for | |
713 | * user space tracing. | |
714 | */ | |
715 | new_stream->hangup_flush_done = 0; | |
716 | ||
9ce5646a MD |
717 | health_code_update(); |
718 | ||
d2956687 | 719 | pthread_mutex_lock(&new_stream->lock); |
633d0084 DG |
720 | if (ctx->on_recv_stream) { |
721 | ret = ctx->on_recv_stream(new_stream); | |
722 | if (ret < 0) { | |
d2956687 JG |
723 | pthread_mutex_unlock(&new_stream->lock); |
724 | pthread_mutex_unlock(&channel->lock); | |
d771f832 | 725 | consumer_stream_free(new_stream); |
c5c7998f | 726 | goto error_add_stream_nosignal; |
fb3a43a9 | 727 | } |
633d0084 | 728 | } |
9ce5646a MD |
729 | health_code_update(); |
730 | ||
07b86b52 JD |
731 | if (new_stream->metadata_flag) { |
732 | channel->metadata_stream = new_stream; | |
733 | } | |
734 | ||
2bba9e53 DG |
735 | /* Do not monitor this stream. */ |
736 | if (!channel->monitor) { | |
5eecee74 | 737 | DBG("Kernel consumer add stream %s in no monitor mode with " |
6dc3064a | 738 | "relayd id %" PRIu64, new_stream->name, |
5eecee74 | 739 | new_stream->net_seq_idx); |
10a50311 | 740 | cds_list_add(&new_stream->send_node, &channel->streams.head); |
d2956687 JG |
741 | pthread_mutex_unlock(&new_stream->lock); |
742 | pthread_mutex_unlock(&channel->lock); | |
c5c7998f | 743 | goto end_add_stream; |
6dc3064a DG |
744 | } |
745 | ||
e1b71bdc DG |
746 | /* Send stream to relayd if the stream has an ID. */ |
747 | if (new_stream->net_seq_idx != (uint64_t) -1ULL) { | |
194ee077 DG |
748 | ret = consumer_send_relayd_stream(new_stream, |
749 | new_stream->chan->pathname); | |
e1b71bdc | 750 | if (ret < 0) { |
d2956687 JG |
751 | pthread_mutex_unlock(&new_stream->lock); |
752 | pthread_mutex_unlock(&channel->lock); | |
e1b71bdc | 753 | consumer_stream_free(new_stream); |
c5c7998f | 754 | goto error_add_stream_nosignal; |
e1b71bdc | 755 | } |
001b7e62 MD |
756 | |
757 | /* | |
758 | * If adding an extra stream to an already | |
759 | * existing channel (e.g. cpu hotplug), we need | |
760 | * to send the "streams_sent" command to relayd. | |
761 | */ | |
762 | if (channel->streams_sent_to_relayd) { | |
763 | ret = consumer_send_relayd_streams_sent( | |
764 | new_stream->net_seq_idx); | |
765 | if (ret < 0) { | |
d2956687 JG |
766 | pthread_mutex_unlock(&new_stream->lock); |
767 | pthread_mutex_unlock(&channel->lock); | |
c5c7998f | 768 | goto error_add_stream_nosignal; |
001b7e62 MD |
769 | } |
770 | } | |
e2039c7a | 771 | } |
d2956687 JG |
772 | pthread_mutex_unlock(&new_stream->lock); |
773 | pthread_mutex_unlock(&channel->lock); | |
e2039c7a | 774 | |
50f8ae69 | 775 | /* Get the right pipe where the stream will be sent. */ |
633d0084 | 776 | if (new_stream->metadata_flag) { |
66d583dc | 777 | consumer_add_metadata_stream(new_stream); |
dae10966 | 778 | stream_pipe = ctx->consumer_metadata_pipe; |
3bd1e081 | 779 | } else { |
66d583dc | 780 | consumer_add_data_stream(new_stream); |
dae10966 | 781 | stream_pipe = ctx->consumer_data_pipe; |
50f8ae69 DG |
782 | } |
783 | ||
66d583dc | 784 | /* Visible to other threads */ |
5ab66908 MD |
785 | new_stream->globally_visible = 1; |
786 | ||
9ce5646a MD |
787 | health_code_update(); |
788 | ||
dae10966 | 789 | ret = lttng_pipe_write(stream_pipe, &new_stream, sizeof(new_stream)); |
50f8ae69 | 790 | if (ret < 0) { |
dae10966 | 791 | ERR("Consumer write %s stream to pipe %d", |
50f8ae69 | 792 | new_stream->metadata_flag ? "metadata" : "data", |
dae10966 | 793 | lttng_pipe_get_writefd(stream_pipe)); |
5ab66908 MD |
794 | if (new_stream->metadata_flag) { |
795 | consumer_del_stream_for_metadata(new_stream); | |
796 | } else { | |
797 | consumer_del_stream_for_data(new_stream); | |
798 | } | |
c5c7998f | 799 | goto error_add_stream_nosignal; |
3bd1e081 | 800 | } |
00e2e675 | 801 | |
02d02e31 JD |
802 | DBG("Kernel consumer ADD_STREAM %s (fd: %d) %s with relayd id %" PRIu64, |
803 | new_stream->name, fd, new_stream->chan->pathname, new_stream->relayd_stream_id); | |
c5c7998f | 804 | end_add_stream: |
3bd1e081 | 805 | break; |
c5c7998f JG |
806 | error_add_stream_nosignal: |
807 | goto end_nosignal; | |
808 | error_add_stream_fatal: | |
809 | goto error_fatal; | |
3bd1e081 | 810 | } |
a4baae1b JD |
811 | case LTTNG_CONSUMER_STREAMS_SENT: |
812 | { | |
813 | struct lttng_consumer_channel *channel; | |
814 | ||
815 | /* | |
816 | * Get stream's channel reference. Needed when adding the stream to the | |
817 | * global hash table. | |
818 | */ | |
819 | channel = consumer_find_channel(msg.u.sent_streams.channel_key); | |
820 | if (!channel) { | |
821 | /* | |
822 | * We could not find the channel. Can happen if cpu hotplug | |
823 | * happens while tearing down. | |
824 | */ | |
825 | ERR("Unable to find channel key %" PRIu64, | |
826 | msg.u.sent_streams.channel_key); | |
e462382a | 827 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
a4baae1b JD |
828 | } |
829 | ||
830 | health_code_update(); | |
831 | ||
832 | /* | |
833 | * Send status code to session daemon. | |
834 | */ | |
835 | ret = consumer_send_status_msg(sock, ret_code); | |
f261ad0a | 836 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
a4baae1b | 837 | /* Somehow, the session daemon is not responding anymore. */ |
80d5a658 | 838 | goto error_streams_sent_nosignal; |
a4baae1b JD |
839 | } |
840 | ||
841 | health_code_update(); | |
842 | ||
843 | /* | |
844 | * We should not send this message if we don't monitor the | |
845 | * streams in this channel. | |
846 | */ | |
847 | if (!channel->monitor) { | |
80d5a658 | 848 | goto end_error_streams_sent; |
a4baae1b JD |
849 | } |
850 | ||
851 | health_code_update(); | |
852 | /* Send stream to relayd if the stream has an ID. */ | |
853 | if (msg.u.sent_streams.net_seq_idx != (uint64_t) -1ULL) { | |
854 | ret = consumer_send_relayd_streams_sent( | |
855 | msg.u.sent_streams.net_seq_idx); | |
856 | if (ret < 0) { | |
80d5a658 | 857 | goto error_streams_sent_nosignal; |
a4baae1b | 858 | } |
001b7e62 | 859 | channel->streams_sent_to_relayd = true; |
a4baae1b | 860 | } |
80d5a658 | 861 | end_error_streams_sent: |
a4baae1b | 862 | break; |
80d5a658 JG |
863 | error_streams_sent_nosignal: |
864 | goto end_nosignal; | |
a4baae1b | 865 | } |
3bd1e081 MD |
866 | case LTTNG_CONSUMER_UPDATE_STREAM: |
867 | { | |
3f8e211f DG |
868 | rcu_read_unlock(); |
869 | return -ENOSYS; | |
870 | } | |
871 | case LTTNG_CONSUMER_DESTROY_RELAYD: | |
872 | { | |
a6ba4fe1 | 873 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
3f8e211f DG |
874 | struct consumer_relayd_sock_pair *relayd; |
875 | ||
a6ba4fe1 | 876 | DBG("Kernel consumer destroying relayd %" PRIu64, index); |
3f8e211f DG |
877 | |
878 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 879 | relayd = consumer_find_relayd(index); |
3f8e211f | 880 | if (relayd == NULL) { |
3448e266 | 881 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 882 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
3bd1e081 | 883 | } |
3f8e211f | 884 | |
a6ba4fe1 DG |
885 | /* |
886 | * Each relayd socket pair has a refcount of stream attached to it | |
887 | * which tells if the relayd is still active or not depending on the | |
888 | * refcount value. | |
889 | * | |
890 | * This will set the destroy flag of the relayd object and destroy it | |
891 | * if the refcount reaches zero when called. | |
892 | * | |
893 | * The destroy can happen either here or when a stream fd hangs up. | |
894 | */ | |
f50f23d9 DG |
895 | if (relayd) { |
896 | consumer_flag_relayd_for_destroy(relayd); | |
897 | } | |
898 | ||
9ce5646a MD |
899 | health_code_update(); |
900 | ||
f50f23d9 DG |
901 | ret = consumer_send_status_msg(sock, ret_code); |
902 | if (ret < 0) { | |
903 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 904 | goto error_fatal; |
f50f23d9 | 905 | } |
3f8e211f | 906 | |
3f8e211f | 907 | goto end_nosignal; |
3bd1e081 | 908 | } |
6d805429 | 909 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 910 | { |
c8f59ee5 | 911 | int32_t ret; |
6d805429 | 912 | uint64_t id = msg.u.data_pending.session_id; |
c8f59ee5 | 913 | |
6d805429 | 914 | DBG("Kernel consumer data pending command for id %" PRIu64, id); |
c8f59ee5 | 915 | |
6d805429 | 916 | ret = consumer_data_pending(id); |
c8f59ee5 | 917 | |
9ce5646a MD |
918 | health_code_update(); |
919 | ||
c8f59ee5 DG |
920 | /* Send back returned value to session daemon */ |
921 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
922 | if (ret < 0) { | |
6d805429 | 923 | PERROR("send data pending ret code"); |
1803a064 | 924 | goto error_fatal; |
c8f59ee5 | 925 | } |
f50f23d9 DG |
926 | |
927 | /* | |
928 | * No need to send back a status message since the data pending | |
929 | * returned value is the response. | |
930 | */ | |
c8f59ee5 | 931 | break; |
53632229 | 932 | } |
6dc3064a DG |
933 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
934 | { | |
3eb928aa MD |
935 | struct lttng_consumer_channel *channel; |
936 | uint64_t key = msg.u.snapshot_channel.key; | |
937 | ||
938 | channel = consumer_find_channel(key); | |
939 | if (!channel) { | |
940 | ERR("Channel %" PRIu64 " not found", key); | |
941 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
07b86b52 | 942 | } else { |
3eb928aa MD |
943 | if (msg.u.snapshot_channel.metadata == 1) { |
944 | ret = lttng_kconsumer_snapshot_metadata(channel, key, | |
945 | msg.u.snapshot_channel.pathname, | |
946 | msg.u.snapshot_channel.relayd_id, ctx); | |
947 | if (ret < 0) { | |
948 | ERR("Snapshot metadata failed"); | |
949 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
950 | } | |
951 | } else { | |
952 | ret = lttng_kconsumer_snapshot_channel(channel, key, | |
953 | msg.u.snapshot_channel.pathname, | |
954 | msg.u.snapshot_channel.relayd_id, | |
955 | msg.u.snapshot_channel.nb_packets_per_stream, | |
956 | ctx); | |
957 | if (ret < 0) { | |
958 | ERR("Snapshot channel failed"); | |
959 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
960 | } | |
07b86b52 JD |
961 | } |
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 | } |
1223361a JG |
1313 | case LTTNG_CONSUMER_OPEN_CHANNEL_PACKETS: |
1314 | { | |
1315 | const uint64_t key = msg.u.open_channel_packets.key; | |
1316 | struct lttng_consumer_channel *channel = | |
1317 | consumer_find_channel(key); | |
1318 | ||
1319 | if (channel) { | |
1320 | pthread_mutex_lock(&channel->lock); | |
1321 | ret_code = lttng_consumer_open_channel_packets(channel); | |
1322 | pthread_mutex_unlock(&channel->lock); | |
1323 | } else { | |
1324 | WARN("Channel %" PRIu64 " not found", key); | |
1325 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
1326 | } | |
1327 | ||
1328 | health_code_update(); | |
1329 | goto end_msg_sessiond; | |
1330 | } | |
3bd1e081 | 1331 | default: |
3f8e211f | 1332 | goto end_nosignal; |
3bd1e081 | 1333 | } |
3f8e211f | 1334 | |
3bd1e081 | 1335 | end_nosignal: |
4cbc1a04 DG |
1336 | /* |
1337 | * Return 1 to indicate success since the 0 value can be a socket | |
1338 | * shutdown during the recv() or send() call. | |
1339 | */ | |
c5c7998f JG |
1340 | ret = 1; |
1341 | goto end; | |
1342 | error_fatal: | |
1343 | /* This will issue a consumer stop. */ | |
1344 | ret = -1; | |
1345 | goto end; | |
d2956687 JG |
1346 | end_msg_sessiond: |
1347 | /* | |
1348 | * The returned value here is not useful since either way we'll return 1 to | |
1349 | * the caller because the session daemon socket management is done | |
1350 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. | |
1351 | */ | |
1352 | ret = consumer_send_status_msg(sock, ret_code); | |
1353 | if (ret < 0) { | |
1354 | goto error_fatal; | |
1355 | } | |
c5c7998f JG |
1356 | ret = 1; |
1357 | end: | |
d2956687 | 1358 | health_code_update(); |
1803a064 | 1359 | rcu_read_unlock(); |
c5c7998f | 1360 | return ret; |
3bd1e081 | 1361 | } |
d41f73b7 | 1362 | |
94d49140 JD |
1363 | /* |
1364 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
1365 | * metadata thread can consumer them. | |
1366 | * | |
1367 | * Metadata stream lock MUST be acquired. | |
94d49140 | 1368 | */ |
835322da JG |
1369 | enum sync_metadata_status lttng_kconsumer_sync_metadata( |
1370 | struct lttng_consumer_stream *metadata) | |
94d49140 JD |
1371 | { |
1372 | int ret; | |
835322da | 1373 | enum sync_metadata_status status; |
94d49140 JD |
1374 | |
1375 | assert(metadata); | |
1376 | ||
1377 | ret = kernctl_buffer_flush(metadata->wait_fd); | |
1378 | if (ret < 0) { | |
1379 | ERR("Failed to flush kernel stream"); | |
835322da | 1380 | status = SYNC_METADATA_STATUS_ERROR; |
94d49140 JD |
1381 | goto end; |
1382 | } | |
1383 | ||
1384 | ret = kernctl_snapshot(metadata->wait_fd); | |
1385 | if (ret < 0) { | |
835322da JG |
1386 | if (errno == EAGAIN) { |
1387 | /* No new metadata, exit. */ | |
1388 | DBG("Sync metadata, no new kernel metadata"); | |
1389 | status = SYNC_METADATA_STATUS_NO_DATA; | |
1390 | } else { | |
94d49140 | 1391 | ERR("Sync metadata, taking kernel snapshot failed."); |
835322da | 1392 | status = SYNC_METADATA_STATUS_ERROR; |
94d49140 | 1393 | } |
835322da JG |
1394 | } else { |
1395 | status = SYNC_METADATA_STATUS_NEW_DATA; | |
94d49140 JD |
1396 | } |
1397 | ||
1398 | end: | |
835322da | 1399 | return status; |
94d49140 | 1400 | } |
309167d2 | 1401 | |
fb83fe64 | 1402 | static |
bdc8d1bb JG |
1403 | int extract_common_subbuffer_info(struct lttng_consumer_stream *stream, |
1404 | struct stream_subbuffer *subbuf) | |
fb83fe64 JD |
1405 | { |
1406 | int ret; | |
fb83fe64 | 1407 | |
bdc8d1bb JG |
1408 | ret = kernctl_get_subbuf_size( |
1409 | stream->wait_fd, &subbuf->info.data.subbuf_size); | |
1410 | if (ret) { | |
fb83fe64 JD |
1411 | goto end; |
1412 | } | |
fb83fe64 | 1413 | |
bdc8d1bb JG |
1414 | ret = kernctl_get_padded_subbuf_size( |
1415 | stream->wait_fd, &subbuf->info.data.padded_subbuf_size); | |
1416 | if (ret) { | |
fb83fe64 JD |
1417 | goto end; |
1418 | } | |
fb83fe64 JD |
1419 | |
1420 | end: | |
1421 | return ret; | |
1422 | } | |
1423 | ||
93ec662e | 1424 | static |
bdc8d1bb JG |
1425 | int extract_metadata_subbuffer_info(struct lttng_consumer_stream *stream, |
1426 | struct stream_subbuffer *subbuf) | |
93ec662e JD |
1427 | { |
1428 | int ret; | |
93ec662e | 1429 | |
bdc8d1bb JG |
1430 | ret = extract_common_subbuffer_info(stream, subbuf); |
1431 | if (ret) { | |
93ec662e JD |
1432 | goto end; |
1433 | } | |
1434 | ||
bdc8d1bb JG |
1435 | ret = kernctl_get_metadata_version( |
1436 | stream->wait_fd, &subbuf->info.metadata.version); | |
1437 | if (ret) { | |
93ec662e JD |
1438 | goto end; |
1439 | } | |
1440 | ||
93ec662e JD |
1441 | end: |
1442 | return ret; | |
1443 | } | |
1444 | ||
bdc8d1bb JG |
1445 | static |
1446 | int extract_data_subbuffer_info(struct lttng_consumer_stream *stream, | |
1447 | struct stream_subbuffer *subbuf) | |
d41f73b7 | 1448 | { |
bdc8d1bb | 1449 | int ret; |
d41f73b7 | 1450 | |
bdc8d1bb JG |
1451 | ret = extract_common_subbuffer_info(stream, subbuf); |
1452 | if (ret) { | |
1453 | goto end; | |
1454 | } | |
309167d2 | 1455 | |
bdc8d1bb JG |
1456 | ret = kernctl_get_packet_size( |
1457 | stream->wait_fd, &subbuf->info.data.packet_size); | |
1458 | if (ret < 0) { | |
1459 | PERROR("Failed to get sub-buffer packet size"); | |
1460 | goto end; | |
1461 | } | |
02d02e31 | 1462 | |
bdc8d1bb JG |
1463 | ret = kernctl_get_content_size( |
1464 | stream->wait_fd, &subbuf->info.data.content_size); | |
1465 | if (ret < 0) { | |
1466 | PERROR("Failed to get sub-buffer content size"); | |
1467 | goto end; | |
d41f73b7 MD |
1468 | } |
1469 | ||
bdc8d1bb JG |
1470 | ret = kernctl_get_timestamp_begin( |
1471 | stream->wait_fd, &subbuf->info.data.timestamp_begin); | |
1472 | if (ret < 0) { | |
1473 | PERROR("Failed to get sub-buffer begin timestamp"); | |
1474 | goto end; | |
1d4dfdef DG |
1475 | } |
1476 | ||
bdc8d1bb JG |
1477 | ret = kernctl_get_timestamp_end( |
1478 | stream->wait_fd, &subbuf->info.data.timestamp_end); | |
1479 | if (ret < 0) { | |
1480 | PERROR("Failed to get sub-buffer end timestamp"); | |
1481 | goto end; | |
1482 | } | |
1483 | ||
1484 | ret = kernctl_get_events_discarded( | |
1485 | stream->wait_fd, &subbuf->info.data.events_discarded); | |
1486 | if (ret) { | |
1487 | PERROR("Failed to get sub-buffer events discarded count"); | |
1488 | goto end; | |
1489 | } | |
1490 | ||
1491 | ret = kernctl_get_sequence_number(stream->wait_fd, | |
1492 | &subbuf->info.data.sequence_number.value); | |
1493 | if (ret) { | |
1494 | /* May not be supported by older LTTng-modules. */ | |
1495 | if (ret != -ENOTTY) { | |
1496 | PERROR("Failed to get sub-buffer sequence number"); | |
1497 | goto end; | |
fb83fe64 | 1498 | } |
1c20f0e2 | 1499 | } else { |
bdc8d1bb | 1500 | subbuf->info.data.sequence_number.is_set = true; |
309167d2 JD |
1501 | } |
1502 | ||
bdc8d1bb JG |
1503 | ret = kernctl_get_stream_id( |
1504 | stream->wait_fd, &subbuf->info.data.stream_id); | |
1505 | if (ret < 0) { | |
1506 | PERROR("Failed to get stream id"); | |
1507 | goto end; | |
1508 | } | |
1d4dfdef | 1509 | |
bdc8d1bb JG |
1510 | ret = kernctl_get_instance_id(stream->wait_fd, |
1511 | &subbuf->info.data.stream_instance_id.value); | |
1512 | if (ret) { | |
1513 | /* May not be supported by older LTTng-modules. */ | |
1514 | if (ret != -ENOTTY) { | |
1515 | PERROR("Failed to get stream instance id"); | |
1516 | goto end; | |
1d4dfdef | 1517 | } |
bdc8d1bb JG |
1518 | } else { |
1519 | subbuf->info.data.stream_instance_id.is_set = true; | |
1520 | } | |
1521 | end: | |
1522 | return ret; | |
1523 | } | |
47e81c02 | 1524 | |
bdc8d1bb JG |
1525 | static |
1526 | int get_subbuffer_common(struct lttng_consumer_stream *stream, | |
1527 | struct stream_subbuffer *subbuffer) | |
1528 | { | |
1529 | int ret; | |
1530 | ||
1531 | ret = kernctl_get_next_subbuf(stream->wait_fd); | |
1532 | if (ret) { | |
bc93eeca MD |
1533 | /* |
1534 | * The caller only expects -ENODATA when there is no data to | |
1535 | * read, but the kernel tracer returns -EAGAIN when there is | |
1536 | * currently no data for a non-finalized stream, and -ENODATA | |
1537 | * when there is no data for a finalized stream. Those can be | |
1538 | * combined into a -ENODATA return value. | |
1539 | */ | |
1540 | if (ret == -EAGAIN) { | |
1541 | ret = -ENODATA; | |
1542 | } | |
1543 | ||
bdc8d1bb JG |
1544 | goto end; |
1545 | } | |
1546 | ||
1547 | ret = stream->read_subbuffer_ops.extract_subbuffer_info( | |
1548 | stream, subbuffer); | |
1549 | end: | |
1550 | return ret; | |
1551 | } | |
276cd1d7 | 1552 | |
bdc8d1bb JG |
1553 | static |
1554 | int get_next_subbuffer_splice(struct lttng_consumer_stream *stream, | |
1555 | struct stream_subbuffer *subbuffer) | |
1556 | { | |
1557 | int ret; | |
1d4dfdef | 1558 | |
bdc8d1bb JG |
1559 | ret = get_subbuffer_common(stream, subbuffer); |
1560 | if (ret) { | |
1561 | goto end; | |
1562 | } | |
1d4dfdef | 1563 | |
bdc8d1bb JG |
1564 | subbuffer->buffer.fd = stream->wait_fd; |
1565 | end: | |
1566 | return ret; | |
1567 | } | |
a587bd64 | 1568 | |
bdc8d1bb JG |
1569 | static |
1570 | int get_next_subbuffer_mmap(struct lttng_consumer_stream *stream, | |
1571 | struct stream_subbuffer *subbuffer) | |
1572 | { | |
1573 | int ret; | |
1574 | const char *addr; | |
1575 | ||
1576 | ret = get_subbuffer_common(stream, subbuffer); | |
1577 | if (ret) { | |
1578 | goto end; | |
276cd1d7 | 1579 | } |
bdc8d1bb JG |
1580 | |
1581 | ret = get_current_subbuf_addr(stream, &addr); | |
1582 | if (ret) { | |
1583 | goto end; | |
d41f73b7 | 1584 | } |
bdc8d1bb JG |
1585 | |
1586 | subbuffer->buffer.buffer = lttng_buffer_view_init( | |
1587 | addr, 0, subbuffer->info.data.padded_subbuf_size); | |
1588 | end: | |
1589 | return ret; | |
1590 | } | |
1591 | ||
e426953d JG |
1592 | static |
1593 | int get_next_subbuffer_metadata_check(struct lttng_consumer_stream *stream, | |
1594 | struct stream_subbuffer *subbuffer) | |
1595 | { | |
1596 | int ret; | |
1597 | const char *addr; | |
1598 | bool coherent; | |
1599 | ||
1600 | ret = kernctl_get_next_subbuf_metadata_check(stream->wait_fd, | |
1601 | &coherent); | |
1602 | if (ret) { | |
1603 | goto end; | |
1604 | } | |
1605 | ||
1606 | ret = stream->read_subbuffer_ops.extract_subbuffer_info( | |
1607 | stream, subbuffer); | |
1608 | if (ret) { | |
1609 | goto end; | |
1610 | } | |
1611 | ||
1612 | LTTNG_OPTIONAL_SET(&subbuffer->info.metadata.coherent, coherent); | |
1613 | ||
1614 | ret = get_current_subbuf_addr(stream, &addr); | |
1615 | if (ret) { | |
1616 | goto end; | |
1617 | } | |
1618 | ||
1619 | subbuffer->buffer.buffer = lttng_buffer_view_init( | |
1620 | addr, 0, subbuffer->info.data.padded_subbuf_size); | |
1621 | DBG("Got metadata packet with padded_subbuf_size = %lu, coherent = %s", | |
1622 | subbuffer->info.metadata.padded_subbuf_size, | |
1623 | coherent ? "true" : "false"); | |
1624 | end: | |
bc93eeca MD |
1625 | /* |
1626 | * The caller only expects -ENODATA when there is no data to read, but | |
1627 | * the kernel tracer returns -EAGAIN when there is currently no data | |
1628 | * for a non-finalized stream, and -ENODATA when there is no data for a | |
1629 | * finalized stream. Those can be combined into a -ENODATA return value. | |
1630 | */ | |
1631 | if (ret == -EAGAIN) { | |
1632 | ret = -ENODATA; | |
1633 | } | |
1634 | ||
e426953d JG |
1635 | return ret; |
1636 | } | |
1637 | ||
bdc8d1bb JG |
1638 | static |
1639 | int put_next_subbuffer(struct lttng_consumer_stream *stream, | |
1640 | struct stream_subbuffer *subbuffer) | |
1641 | { | |
1642 | const int ret = kernctl_put_next_subbuf(stream->wait_fd); | |
1643 | ||
1644 | if (ret) { | |
1645 | if (ret == -EFAULT) { | |
1646 | PERROR("Error in unreserving sub buffer"); | |
1647 | } else if (ret == -EIO) { | |
d41f73b7 | 1648 | /* Should never happen with newer LTTng versions */ |
bdc8d1bb | 1649 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted"); |
d41f73b7 | 1650 | } |
d41f73b7 MD |
1651 | } |
1652 | ||
bdc8d1bb JG |
1653 | return ret; |
1654 | } | |
1c20f0e2 | 1655 | |
e426953d JG |
1656 | static |
1657 | bool is_get_next_check_metadata_available(int tracer_fd) | |
1658 | { | |
77de880d JG |
1659 | const int ret = kernctl_get_next_subbuf_metadata_check(tracer_fd, NULL); |
1660 | const bool available = ret != -ENOTTY; | |
1661 | ||
1662 | if (ret == 0) { | |
1663 | /* get succeeded, make sure to put the subbuffer. */ | |
1664 | kernctl_put_subbuf(tracer_fd); | |
1665 | } | |
1666 | ||
1667 | return available; | |
e426953d JG |
1668 | } |
1669 | ||
27585b30 MD |
1670 | static |
1671 | int signal_metadata(struct lttng_consumer_stream *stream, | |
1672 | struct lttng_consumer_local_data *ctx) | |
1673 | { | |
1674 | ASSERT_LOCKED(stream->metadata_rdv_lock); | |
1675 | return pthread_cond_broadcast(&stream->metadata_rdv) ? -errno : 0; | |
1676 | } | |
1677 | ||
e426953d JG |
1678 | static |
1679 | int lttng_kconsumer_set_stream_ops( | |
bdc8d1bb JG |
1680 | struct lttng_consumer_stream *stream) |
1681 | { | |
e426953d JG |
1682 | int ret = 0; |
1683 | ||
1684 | if (stream->metadata_flag && stream->chan->is_live) { | |
1685 | DBG("Attempting to enable metadata bucketization for live consumers"); | |
1686 | if (is_get_next_check_metadata_available(stream->wait_fd)) { | |
1687 | DBG("Kernel tracer supports get_next_subbuffer_metadata_check, metadata will be accumulated until a coherent state is reached"); | |
1688 | stream->read_subbuffer_ops.get_next_subbuffer = | |
1689 | get_next_subbuffer_metadata_check; | |
1690 | ret = consumer_stream_enable_metadata_bucketization( | |
1691 | stream); | |
1692 | if (ret) { | |
1693 | goto end; | |
1694 | } | |
1695 | } else { | |
1696 | /* | |
1697 | * The kernel tracer version is too old to indicate | |
1698 | * when the metadata stream has reached a "coherent" | |
1699 | * (parseable) point. | |
1700 | * | |
1701 | * This means that a live viewer may see an incoherent | |
1702 | * sequence of metadata and fail to parse it. | |
1703 | */ | |
1704 | WARN("Kernel tracer does not support get_next_subbuffer_metadata_check which may cause live clients to fail to parse the metadata stream"); | |
1705 | metadata_bucket_destroy(stream->metadata_bucket); | |
1706 | stream->metadata_bucket = NULL; | |
1707 | } | |
27585b30 MD |
1708 | |
1709 | stream->read_subbuffer_ops.on_sleep = signal_metadata; | |
e426953d JG |
1710 | } |
1711 | ||
1712 | if (!stream->read_subbuffer_ops.get_next_subbuffer) { | |
1713 | if (stream->chan->output == CONSUMER_CHANNEL_MMAP) { | |
1714 | stream->read_subbuffer_ops.get_next_subbuffer = | |
1715 | get_next_subbuffer_mmap; | |
1716 | } else { | |
1717 | stream->read_subbuffer_ops.get_next_subbuffer = | |
1718 | get_next_subbuffer_splice; | |
1719 | } | |
94d49140 JD |
1720 | } |
1721 | ||
bdc8d1bb JG |
1722 | if (stream->metadata_flag) { |
1723 | stream->read_subbuffer_ops.extract_subbuffer_info = | |
1724 | extract_metadata_subbuffer_info; | |
1725 | } else { | |
1726 | stream->read_subbuffer_ops.extract_subbuffer_info = | |
1727 | extract_data_subbuffer_info; | |
1728 | if (stream->chan->is_live) { | |
1729 | stream->read_subbuffer_ops.send_live_beacon = | |
1730 | consumer_flush_kernel_index; | |
1731 | } | |
309167d2 JD |
1732 | } |
1733 | ||
bdc8d1bb | 1734 | stream->read_subbuffer_ops.put_next_subbuffer = put_next_subbuffer; |
e426953d JG |
1735 | end: |
1736 | return ret; | |
d41f73b7 MD |
1737 | } |
1738 | ||
1739 | int lttng_kconsumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
1740 | { | |
1741 | int ret; | |
ffe60014 DG |
1742 | |
1743 | assert(stream); | |
1744 | ||
2bba9e53 | 1745 | /* |
d2956687 JG |
1746 | * Don't create anything if this is set for streaming or if there is |
1747 | * no current trace chunk on the parent channel. | |
2bba9e53 | 1748 | */ |
d2956687 JG |
1749 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor && |
1750 | stream->chan->trace_chunk) { | |
1751 | ret = consumer_stream_create_output_files(stream, true); | |
1752 | if (ret) { | |
fe4477ee JD |
1753 | goto error; |
1754 | } | |
ffe60014 | 1755 | } |
d41f73b7 | 1756 | |
d41f73b7 MD |
1757 | if (stream->output == LTTNG_EVENT_MMAP) { |
1758 | /* get the len of the mmap region */ | |
1759 | unsigned long mmap_len; | |
1760 | ||
1761 | ret = kernctl_get_mmap_len(stream->wait_fd, &mmap_len); | |
1762 | if (ret != 0) { | |
ffe60014 | 1763 | PERROR("kernctl_get_mmap_len"); |
d41f73b7 MD |
1764 | goto error_close_fd; |
1765 | } | |
1766 | stream->mmap_len = (size_t) mmap_len; | |
1767 | ||
ffe60014 DG |
1768 | stream->mmap_base = mmap(NULL, stream->mmap_len, PROT_READ, |
1769 | MAP_PRIVATE, stream->wait_fd, 0); | |
d41f73b7 | 1770 | if (stream->mmap_base == MAP_FAILED) { |
ffe60014 | 1771 | PERROR("Error mmaping"); |
d41f73b7 MD |
1772 | ret = -1; |
1773 | goto error_close_fd; | |
1774 | } | |
1775 | } | |
1776 | ||
e426953d JG |
1777 | ret = lttng_kconsumer_set_stream_ops(stream); |
1778 | if (ret) { | |
1779 | goto error_close_fd; | |
1780 | } | |
bdc8d1bb | 1781 | |
d41f73b7 MD |
1782 | /* we return 0 to let the library handle the FD internally */ |
1783 | return 0; | |
1784 | ||
1785 | error_close_fd: | |
2f225ce2 | 1786 | if (stream->out_fd >= 0) { |
d41f73b7 MD |
1787 | int err; |
1788 | ||
1789 | err = close(stream->out_fd); | |
1790 | assert(!err); | |
2f225ce2 | 1791 | stream->out_fd = -1; |
d41f73b7 MD |
1792 | } |
1793 | error: | |
1794 | return ret; | |
1795 | } | |
1796 | ||
ca22feea DG |
1797 | /* |
1798 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
1799 | * stream. Consumer data lock MUST be acquired before calling this function |
1800 | * and the stream lock. | |
ca22feea | 1801 | * |
6d805429 | 1802 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
1803 | * data is available for trace viewer reading. |
1804 | */ | |
6d805429 | 1805 | int lttng_kconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
1806 | { |
1807 | int ret; | |
1808 | ||
1809 | assert(stream); | |
1810 | ||
873b9e9a MD |
1811 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
1812 | ret = 0; | |
1813 | goto end; | |
1814 | } | |
1815 | ||
ca22feea DG |
1816 | ret = kernctl_get_next_subbuf(stream->wait_fd); |
1817 | if (ret == 0) { | |
1818 | /* There is still data so let's put back this subbuffer. */ | |
1819 | ret = kernctl_put_subbuf(stream->wait_fd); | |
1820 | assert(ret == 0); | |
6d805429 | 1821 | ret = 1; /* Data is pending */ |
4e9a4686 | 1822 | goto end; |
ca22feea DG |
1823 | } |
1824 | ||
6d805429 DG |
1825 | /* Data is NOT pending and ready to be read. */ |
1826 | ret = 0; | |
ca22feea | 1827 | |
6efae65e DG |
1828 | end: |
1829 | return ret; | |
ca22feea | 1830 | } |