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> |
0857097f | 37 | |
10a8a223 | 38 | #include "kernel-consumer.h" |
3bd1e081 MD |
39 | |
40 | extern struct lttng_consumer_global_data consumer_data; | |
41 | extern int consumer_poll_timeout; | |
3bd1e081 | 42 | |
3bd1e081 MD |
43 | /* |
44 | * Take a snapshot for a specific fd | |
45 | * | |
46 | * Returns 0 on success, < 0 on error | |
47 | */ | |
ffe60014 | 48 | int lttng_kconsumer_take_snapshot(struct lttng_consumer_stream *stream) |
3bd1e081 MD |
49 | { |
50 | int ret = 0; | |
51 | int infd = stream->wait_fd; | |
52 | ||
53 | ret = kernctl_snapshot(infd); | |
d2d2f190 JD |
54 | /* |
55 | * -EAGAIN is not an error, it just means that there is no data to | |
56 | * be read. | |
57 | */ | |
58 | if (ret != 0 && ret != -EAGAIN) { | |
5a510c9f | 59 | PERROR("Getting sub-buffer snapshot."); |
3bd1e081 MD |
60 | } |
61 | ||
62 | return ret; | |
63 | } | |
64 | ||
e9404c27 JG |
65 | /* |
66 | * Sample consumed and produced positions for a specific fd. | |
67 | * | |
68 | * Returns 0 on success, < 0 on error. | |
69 | */ | |
70 | int lttng_kconsumer_sample_snapshot_positions( | |
71 | struct lttng_consumer_stream *stream) | |
72 | { | |
73 | assert(stream); | |
74 | ||
75 | return kernctl_snapshot_sample_positions(stream->wait_fd); | |
76 | } | |
77 | ||
3bd1e081 MD |
78 | /* |
79 | * Get the produced position | |
80 | * | |
81 | * Returns 0 on success, < 0 on error | |
82 | */ | |
ffe60014 | 83 | int lttng_kconsumer_get_produced_snapshot(struct lttng_consumer_stream *stream, |
3bd1e081 MD |
84 | unsigned long *pos) |
85 | { | |
86 | int ret; | |
87 | int infd = stream->wait_fd; | |
88 | ||
89 | ret = kernctl_snapshot_get_produced(infd, pos); | |
90 | if (ret != 0) { | |
5a510c9f | 91 | PERROR("kernctl_snapshot_get_produced"); |
3bd1e081 MD |
92 | } |
93 | ||
94 | return ret; | |
95 | } | |
96 | ||
07b86b52 JD |
97 | /* |
98 | * Get the consumerd position | |
99 | * | |
100 | * Returns 0 on success, < 0 on error | |
101 | */ | |
102 | int lttng_kconsumer_get_consumed_snapshot(struct lttng_consumer_stream *stream, | |
103 | unsigned long *pos) | |
104 | { | |
105 | int ret; | |
106 | int infd = stream->wait_fd; | |
107 | ||
108 | ret = kernctl_snapshot_get_consumed(infd, pos); | |
109 | if (ret != 0) { | |
5a510c9f | 110 | PERROR("kernctl_snapshot_get_consumed"); |
07b86b52 JD |
111 | } |
112 | ||
113 | return ret; | |
114 | } | |
115 | ||
07b86b52 JD |
116 | /* |
117 | * Take a snapshot of all the stream of a channel | |
3eb928aa | 118 | * RCU read-side lock must be held across this function to ensure existence of |
d2956687 | 119 | * channel. The channel lock must be held by the caller. |
07b86b52 JD |
120 | * |
121 | * Returns 0 on success, < 0 on error | |
122 | */ | |
f72bb42f JG |
123 | static int lttng_kconsumer_snapshot_channel( |
124 | struct lttng_consumer_channel *channel, | |
125 | uint64_t key, char *path, uint64_t relayd_id, | |
126 | uint64_t nb_packets_per_stream, | |
5c786ded | 127 | struct lttng_consumer_local_data *ctx) |
07b86b52 JD |
128 | { |
129 | int ret; | |
07b86b52 JD |
130 | struct lttng_consumer_stream *stream; |
131 | ||
6a00837f | 132 | DBG("Kernel consumer snapshot channel %" PRIu64, key); |
07b86b52 JD |
133 | |
134 | rcu_read_lock(); | |
135 | ||
07b86b52 JD |
136 | /* Splice is not supported yet for channel snapshot. */ |
137 | if (channel->output != CONSUMER_CHANNEL_MMAP) { | |
9381314c JG |
138 | ERR("Unsupported output type for channel \"%s\": mmap output is required to record a snapshot", |
139 | channel->name); | |
07b86b52 JD |
140 | ret = -1; |
141 | goto end; | |
142 | } | |
143 | ||
10a50311 | 144 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { |
923333cd | 145 | unsigned long consumed_pos, produced_pos; |
9ce5646a MD |
146 | |
147 | health_code_update(); | |
148 | ||
07b86b52 JD |
149 | /* |
150 | * Lock stream because we are about to change its state. | |
151 | */ | |
152 | pthread_mutex_lock(&stream->lock); | |
153 | ||
d2956687 JG |
154 | assert(channel->trace_chunk); |
155 | if (!lttng_trace_chunk_get(channel->trace_chunk)) { | |
156 | /* | |
157 | * Can't happen barring an internal error as the channel | |
158 | * holds a reference to the trace chunk. | |
159 | */ | |
160 | ERR("Failed to acquire reference to channel's trace chunk"); | |
161 | ret = -1; | |
162 | goto end_unlock; | |
163 | } | |
164 | assert(!stream->trace_chunk); | |
165 | stream->trace_chunk = channel->trace_chunk; | |
166 | ||
29decac3 DG |
167 | /* |
168 | * Assign the received relayd ID so we can use it for streaming. The streams | |
169 | * are not visible to anyone so this is OK to change it. | |
170 | */ | |
07b86b52 JD |
171 | stream->net_seq_idx = relayd_id; |
172 | channel->relayd_id = relayd_id; | |
173 | if (relayd_id != (uint64_t) -1ULL) { | |
10a50311 | 174 | ret = consumer_send_relayd_stream(stream, path); |
07b86b52 JD |
175 | if (ret < 0) { |
176 | ERR("sending stream to relayd"); | |
177 | goto end_unlock; | |
178 | } | |
07b86b52 | 179 | } else { |
d2956687 JG |
180 | ret = consumer_stream_create_output_files(stream, |
181 | false); | |
07b86b52 | 182 | if (ret < 0) { |
07b86b52 JD |
183 | goto end_unlock; |
184 | } | |
d2956687 JG |
185 | DBG("Kernel consumer snapshot stream (%" PRIu64 ")", |
186 | stream->key); | |
07b86b52 JD |
187 | } |
188 | ||
f22dd891 | 189 | ret = kernctl_buffer_flush_empty(stream->wait_fd); |
07b86b52 | 190 | if (ret < 0) { |
f22dd891 MD |
191 | /* |
192 | * Doing a buffer flush which does not take into | |
193 | * account empty packets. This is not perfect | |
194 | * for stream intersection, but required as a | |
195 | * fall-back when "flush_empty" is not | |
196 | * implemented by lttng-modules. | |
197 | */ | |
198 | ret = kernctl_buffer_flush(stream->wait_fd); | |
199 | if (ret < 0) { | |
200 | ERR("Failed to flush kernel stream"); | |
201 | goto end_unlock; | |
202 | } | |
07b86b52 JD |
203 | goto end_unlock; |
204 | } | |
205 | ||
206 | ret = lttng_kconsumer_take_snapshot(stream); | |
207 | if (ret < 0) { | |
208 | ERR("Taking kernel snapshot"); | |
209 | goto end_unlock; | |
210 | } | |
211 | ||
212 | ret = lttng_kconsumer_get_produced_snapshot(stream, &produced_pos); | |
213 | if (ret < 0) { | |
214 | ERR("Produced kernel snapshot position"); | |
215 | goto end_unlock; | |
216 | } | |
217 | ||
218 | ret = lttng_kconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
219 | if (ret < 0) { | |
220 | ERR("Consumerd kernel snapshot position"); | |
221 | goto end_unlock; | |
222 | } | |
223 | ||
d07ceecd MD |
224 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
225 | produced_pos, nb_packets_per_stream, | |
226 | stream->max_sb_size); | |
5c786ded | 227 | |
9377d830 | 228 | while ((long) (consumed_pos - produced_pos) < 0) { |
07b86b52 JD |
229 | ssize_t read_len; |
230 | unsigned long len, padded_len; | |
231 | ||
9ce5646a MD |
232 | health_code_update(); |
233 | ||
07b86b52 JD |
234 | DBG("Kernel consumer taking snapshot at pos %lu", consumed_pos); |
235 | ||
236 | ret = kernctl_get_subbuf(stream->wait_fd, &consumed_pos); | |
237 | if (ret < 0) { | |
32af2c95 | 238 | if (ret != -EAGAIN) { |
07b86b52 JD |
239 | PERROR("kernctl_get_subbuf snapshot"); |
240 | goto end_unlock; | |
241 | } | |
242 | DBG("Kernel consumer get subbuf failed. Skipping it."); | |
243 | consumed_pos += stream->max_sb_size; | |
ddc93ee4 | 244 | stream->chan->lost_packets++; |
07b86b52 JD |
245 | continue; |
246 | } | |
247 | ||
248 | ret = kernctl_get_subbuf_size(stream->wait_fd, &len); | |
249 | if (ret < 0) { | |
250 | ERR("Snapshot kernctl_get_subbuf_size"); | |
29decac3 | 251 | goto error_put_subbuf; |
07b86b52 JD |
252 | } |
253 | ||
254 | ret = kernctl_get_padded_subbuf_size(stream->wait_fd, &padded_len); | |
255 | if (ret < 0) { | |
256 | ERR("Snapshot kernctl_get_padded_subbuf_size"); | |
29decac3 | 257 | goto error_put_subbuf; |
07b86b52 JD |
258 | } |
259 | ||
260 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
309167d2 | 261 | padded_len - len, NULL); |
07b86b52 | 262 | /* |
29decac3 DG |
263 | * We write the padded len in local tracefiles but the data len |
264 | * when using a relay. Display the error but continue processing | |
265 | * to try to release the subbuffer. | |
07b86b52 JD |
266 | */ |
267 | if (relayd_id != (uint64_t) -1ULL) { | |
268 | if (read_len != len) { | |
269 | ERR("Error sending to the relay (ret: %zd != len: %lu)", | |
270 | read_len, len); | |
271 | } | |
272 | } else { | |
273 | if (read_len != padded_len) { | |
274 | ERR("Error writing to tracefile (ret: %zd != len: %lu)", | |
275 | read_len, padded_len); | |
276 | } | |
277 | } | |
278 | ||
279 | ret = kernctl_put_subbuf(stream->wait_fd); | |
280 | if (ret < 0) { | |
281 | ERR("Snapshot kernctl_put_subbuf"); | |
282 | goto end_unlock; | |
283 | } | |
284 | consumed_pos += stream->max_sb_size; | |
285 | } | |
286 | ||
287 | if (relayd_id == (uint64_t) -1ULL) { | |
fdf9986c MD |
288 | if (stream->out_fd >= 0) { |
289 | ret = close(stream->out_fd); | |
290 | if (ret < 0) { | |
291 | PERROR("Kernel consumer snapshot close out_fd"); | |
292 | goto end_unlock; | |
293 | } | |
294 | stream->out_fd = -1; | |
07b86b52 | 295 | } |
07b86b52 JD |
296 | } else { |
297 | close_relayd_stream(stream); | |
298 | stream->net_seq_idx = (uint64_t) -1ULL; | |
299 | } | |
d2956687 JG |
300 | lttng_trace_chunk_put(stream->trace_chunk); |
301 | stream->trace_chunk = NULL; | |
07b86b52 JD |
302 | pthread_mutex_unlock(&stream->lock); |
303 | } | |
304 | ||
305 | /* All good! */ | |
306 | ret = 0; | |
307 | goto end; | |
308 | ||
29decac3 DG |
309 | error_put_subbuf: |
310 | ret = kernctl_put_subbuf(stream->wait_fd); | |
311 | if (ret < 0) { | |
312 | ERR("Snapshot kernctl_put_subbuf error path"); | |
313 | } | |
07b86b52 JD |
314 | end_unlock: |
315 | pthread_mutex_unlock(&stream->lock); | |
316 | end: | |
317 | rcu_read_unlock(); | |
318 | return ret; | |
319 | } | |
320 | ||
321 | /* | |
322 | * Read the whole metadata available for a snapshot. | |
3eb928aa | 323 | * RCU read-side lock must be held across this function to ensure existence of |
d2956687 | 324 | * metadata_channel. The channel lock must be held by the caller. |
07b86b52 JD |
325 | * |
326 | * Returns 0 on success, < 0 on error | |
327 | */ | |
d2956687 JG |
328 | static int lttng_kconsumer_snapshot_metadata( |
329 | struct lttng_consumer_channel *metadata_channel, | |
3eb928aa MD |
330 | uint64_t key, char *path, uint64_t relayd_id, |
331 | struct lttng_consumer_local_data *ctx) | |
07b86b52 | 332 | { |
d771f832 DG |
333 | int ret, use_relayd = 0; |
334 | ssize_t ret_read; | |
07b86b52 | 335 | struct lttng_consumer_stream *metadata_stream; |
d771f832 DG |
336 | |
337 | assert(ctx); | |
07b86b52 JD |
338 | |
339 | DBG("Kernel consumer snapshot metadata with key %" PRIu64 " at path %s", | |
340 | key, path); | |
341 | ||
342 | rcu_read_lock(); | |
343 | ||
07b86b52 JD |
344 | metadata_stream = metadata_channel->metadata_stream; |
345 | assert(metadata_stream); | |
d2956687 | 346 | |
fa27abe8 | 347 | pthread_mutex_lock(&metadata_stream->lock); |
d2956687 JG |
348 | assert(metadata_channel->trace_chunk); |
349 | assert(metadata_stream->trace_chunk); | |
07b86b52 | 350 | |
d771f832 | 351 | /* Flag once that we have a valid relayd for the stream. */ |
e2039c7a | 352 | if (relayd_id != (uint64_t) -1ULL) { |
d771f832 DG |
353 | use_relayd = 1; |
354 | } | |
355 | ||
356 | if (use_relayd) { | |
10a50311 | 357 | ret = consumer_send_relayd_stream(metadata_stream, path); |
e2039c7a | 358 | if (ret < 0) { |
fa27abe8 | 359 | goto error_snapshot; |
e2039c7a | 360 | } |
e2039c7a | 361 | } else { |
d2956687 JG |
362 | ret = consumer_stream_create_output_files(metadata_stream, |
363 | false); | |
e2039c7a | 364 | if (ret < 0) { |
fa27abe8 | 365 | goto error_snapshot; |
e2039c7a | 366 | } |
07b86b52 | 367 | } |
07b86b52 | 368 | |
d771f832 | 369 | do { |
9ce5646a MD |
370 | health_code_update(); |
371 | ||
d2956687 | 372 | ret_read = lttng_kconsumer_read_subbuffer(metadata_stream, ctx); |
d771f832 | 373 | if (ret_read < 0) { |
56591bac | 374 | if (ret_read != -EAGAIN) { |
6a00837f | 375 | ERR("Kernel snapshot reading metadata subbuffer (ret: %zd)", |
d771f832 | 376 | ret_read); |
fa27abe8 JG |
377 | ret = ret_read; |
378 | goto error_snapshot; | |
07b86b52 | 379 | } |
d771f832 | 380 | /* ret_read is negative at this point so we will exit the loop. */ |
07b86b52 JD |
381 | continue; |
382 | } | |
d771f832 | 383 | } while (ret_read >= 0); |
07b86b52 | 384 | |
d771f832 DG |
385 | if (use_relayd) { |
386 | close_relayd_stream(metadata_stream); | |
387 | metadata_stream->net_seq_idx = (uint64_t) -1ULL; | |
388 | } else { | |
fdf9986c MD |
389 | if (metadata_stream->out_fd >= 0) { |
390 | ret = close(metadata_stream->out_fd); | |
391 | if (ret < 0) { | |
392 | PERROR("Kernel consumer snapshot metadata close out_fd"); | |
393 | /* | |
394 | * Don't go on error here since the snapshot was successful at this | |
395 | * point but somehow the close failed. | |
396 | */ | |
397 | } | |
398 | metadata_stream->out_fd = -1; | |
d2956687 JG |
399 | lttng_trace_chunk_put(metadata_stream->trace_chunk); |
400 | metadata_stream->trace_chunk = NULL; | |
e2039c7a | 401 | } |
e2039c7a JD |
402 | } |
403 | ||
07b86b52 | 404 | ret = 0; |
fa27abe8 JG |
405 | error_snapshot: |
406 | pthread_mutex_unlock(&metadata_stream->lock); | |
cf53a8a6 JD |
407 | cds_list_del(&metadata_stream->send_node); |
408 | consumer_stream_destroy(metadata_stream, NULL); | |
409 | metadata_channel->metadata_stream = NULL; | |
07b86b52 JD |
410 | rcu_read_unlock(); |
411 | return ret; | |
412 | } | |
413 | ||
1803a064 MD |
414 | /* |
415 | * Receive command from session daemon and process it. | |
416 | * | |
417 | * Return 1 on success else a negative value or 0. | |
418 | */ | |
3bd1e081 MD |
419 | int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
420 | int sock, struct pollfd *consumer_sockpoll) | |
421 | { | |
422 | ssize_t ret; | |
0c759fc9 | 423 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 MD |
424 | struct lttcomm_consumer_msg msg; |
425 | ||
9ce5646a MD |
426 | health_code_update(); |
427 | ||
3bd1e081 MD |
428 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
429 | if (ret != sizeof(msg)) { | |
1803a064 | 430 | if (ret > 0) { |
c6857fcf | 431 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
1803a064 MD |
432 | ret = -1; |
433 | } | |
3bd1e081 MD |
434 | return ret; |
435 | } | |
9ce5646a MD |
436 | |
437 | health_code_update(); | |
438 | ||
84382d49 MD |
439 | /* Deprecated command */ |
440 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 441 | |
9ce5646a MD |
442 | health_code_update(); |
443 | ||
b0b335c8 MD |
444 | /* relayd needs RCU read-side protection */ |
445 | rcu_read_lock(); | |
446 | ||
3bd1e081 | 447 | switch (msg.cmd_type) { |
00e2e675 DG |
448 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
449 | { | |
f50f23d9 | 450 | /* Session daemon status message are handled in the following call. */ |
2527bf85 | 451 | consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
7735ef9e | 452 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, |
d3e2ba59 | 453 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
2527bf85 | 454 | msg.u.relayd_sock.relayd_session_id); |
00e2e675 DG |
455 | goto end_nosignal; |
456 | } | |
3bd1e081 MD |
457 | case LTTNG_CONSUMER_ADD_CHANNEL: |
458 | { | |
459 | struct lttng_consumer_channel *new_channel; | |
e43c41c5 | 460 | int ret_recv; |
d2956687 | 461 | const uint64_t chunk_id = msg.u.channel.chunk_id.value; |
3bd1e081 | 462 | |
9ce5646a MD |
463 | health_code_update(); |
464 | ||
f50f23d9 DG |
465 | /* First send a status message before receiving the fds. */ |
466 | ret = consumer_send_status_msg(sock, ret_code); | |
467 | if (ret < 0) { | |
468 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 469 | goto error_fatal; |
f50f23d9 | 470 | } |
9ce5646a MD |
471 | |
472 | health_code_update(); | |
473 | ||
d88aee68 | 474 | DBG("consumer_add_channel %" PRIu64, msg.u.channel.channel_key); |
3bd1e081 | 475 | new_channel = consumer_allocate_channel(msg.u.channel.channel_key, |
d2956687 JG |
476 | msg.u.channel.session_id, |
477 | msg.u.channel.chunk_id.is_set ? | |
478 | &chunk_id : NULL, | |
479 | msg.u.channel.pathname, | |
480 | msg.u.channel.name, | |
1624d5b7 JD |
481 | msg.u.channel.relayd_id, msg.u.channel.output, |
482 | msg.u.channel.tracefile_size, | |
1950109e | 483 | msg.u.channel.tracefile_count, 0, |
ecc48a90 | 484 | msg.u.channel.monitor, |
d7ba1388 | 485 | msg.u.channel.live_timer_interval, |
3d071855 | 486 | NULL, NULL); |
3bd1e081 | 487 | if (new_channel == NULL) { |
f73fabfd | 488 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
3bd1e081 MD |
489 | goto end_nosignal; |
490 | } | |
ffe60014 | 491 | new_channel->nb_init_stream_left = msg.u.channel.nb_init_streams; |
95a1109b JD |
492 | switch (msg.u.channel.output) { |
493 | case LTTNG_EVENT_SPLICE: | |
494 | new_channel->output = CONSUMER_CHANNEL_SPLICE; | |
495 | break; | |
496 | case LTTNG_EVENT_MMAP: | |
497 | new_channel->output = CONSUMER_CHANNEL_MMAP; | |
498 | break; | |
499 | default: | |
500 | ERR("Channel output unknown %d", msg.u.channel.output); | |
501 | goto end_nosignal; | |
502 | } | |
ffe60014 DG |
503 | |
504 | /* Translate and save channel type. */ | |
505 | switch (msg.u.channel.type) { | |
506 | case CONSUMER_CHANNEL_TYPE_DATA: | |
507 | case CONSUMER_CHANNEL_TYPE_METADATA: | |
508 | new_channel->type = msg.u.channel.type; | |
509 | break; | |
510 | default: | |
511 | assert(0); | |
512 | goto end_nosignal; | |
513 | }; | |
514 | ||
9ce5646a MD |
515 | health_code_update(); |
516 | ||
3bd1e081 | 517 | if (ctx->on_recv_channel != NULL) { |
e43c41c5 JD |
518 | ret_recv = ctx->on_recv_channel(new_channel); |
519 | if (ret_recv == 0) { | |
520 | ret = consumer_add_channel(new_channel, ctx); | |
521 | } else if (ret_recv < 0) { | |
3bd1e081 MD |
522 | goto end_nosignal; |
523 | } | |
524 | } else { | |
e43c41c5 | 525 | ret = consumer_add_channel(new_channel, ctx); |
3bd1e081 | 526 | } |
e9404c27 JG |
527 | if (msg.u.channel.type == CONSUMER_CHANNEL_TYPE_DATA && !ret) { |
528 | int monitor_start_ret; | |
529 | ||
530 | DBG("Consumer starting monitor timer"); | |
94d49140 JD |
531 | consumer_timer_live_start(new_channel, |
532 | msg.u.channel.live_timer_interval); | |
e9404c27 JG |
533 | monitor_start_ret = consumer_timer_monitor_start( |
534 | new_channel, | |
535 | msg.u.channel.monitor_timer_interval); | |
536 | if (monitor_start_ret < 0) { | |
537 | ERR("Starting channel monitoring timer failed"); | |
538 | goto end_nosignal; | |
539 | } | |
540 | ||
94d49140 | 541 | } |
e43c41c5 | 542 | |
9ce5646a MD |
543 | health_code_update(); |
544 | ||
e43c41c5 | 545 | /* If we received an error in add_channel, we need to report it. */ |
821fffb2 | 546 | if (ret < 0) { |
1803a064 MD |
547 | ret = consumer_send_status_msg(sock, ret); |
548 | if (ret < 0) { | |
549 | goto error_fatal; | |
550 | } | |
e43c41c5 JD |
551 | goto end_nosignal; |
552 | } | |
553 | ||
3bd1e081 MD |
554 | goto end_nosignal; |
555 | } | |
556 | case LTTNG_CONSUMER_ADD_STREAM: | |
557 | { | |
dae10966 DG |
558 | int fd; |
559 | struct lttng_pipe *stream_pipe; | |
00e2e675 | 560 | struct lttng_consumer_stream *new_stream; |
ffe60014 | 561 | struct lttng_consumer_channel *channel; |
c80048c6 | 562 | int alloc_ret = 0; |
3bd1e081 | 563 | |
ffe60014 DG |
564 | /* |
565 | * Get stream's channel reference. Needed when adding the stream to the | |
566 | * global hash table. | |
567 | */ | |
568 | channel = consumer_find_channel(msg.u.stream.channel_key); | |
569 | if (!channel) { | |
570 | /* | |
571 | * We could not find the channel. Can happen if cpu hotplug | |
572 | * happens while tearing down. | |
573 | */ | |
d88aee68 | 574 | ERR("Unable to find channel key %" PRIu64, msg.u.stream.channel_key); |
e462382a | 575 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
ffe60014 DG |
576 | } |
577 | ||
9ce5646a MD |
578 | health_code_update(); |
579 | ||
f50f23d9 DG |
580 | /* First send a status message before receiving the fds. */ |
581 | ret = consumer_send_status_msg(sock, ret_code); | |
1803a064 | 582 | if (ret < 0) { |
d771f832 | 583 | /* Somehow, the session daemon is not responding anymore. */ |
c5c7998f | 584 | goto error_add_stream_fatal; |
1803a064 | 585 | } |
9ce5646a MD |
586 | |
587 | health_code_update(); | |
588 | ||
0c759fc9 | 589 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
d771f832 | 590 | /* Channel was not found. */ |
c5c7998f | 591 | goto error_add_stream_nosignal; |
f50f23d9 DG |
592 | } |
593 | ||
d771f832 | 594 | /* Blocking call */ |
9ce5646a MD |
595 | health_poll_entry(); |
596 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
597 | health_poll_exit(); | |
84382d49 | 598 | if (ret) { |
c5c7998f | 599 | goto error_add_stream_fatal; |
3bd1e081 | 600 | } |
00e2e675 | 601 | |
9ce5646a MD |
602 | health_code_update(); |
603 | ||
00e2e675 | 604 | /* Get stream file descriptor from socket */ |
f2fc6720 MD |
605 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); |
606 | if (ret != sizeof(fd)) { | |
f73fabfd | 607 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
c5c7998f | 608 | goto end; |
3bd1e081 | 609 | } |
3bd1e081 | 610 | |
9ce5646a MD |
611 | health_code_update(); |
612 | ||
f50f23d9 DG |
613 | /* |
614 | * Send status code to session daemon only if the recv works. If the | |
615 | * above recv() failed, the session daemon is notified through the | |
616 | * error socket and the teardown is eventually done. | |
617 | */ | |
618 | ret = consumer_send_status_msg(sock, ret_code); | |
619 | if (ret < 0) { | |
620 | /* Somehow, the session daemon is not responding anymore. */ | |
c5c7998f | 621 | goto error_add_stream_nosignal; |
f50f23d9 DG |
622 | } |
623 | ||
9ce5646a MD |
624 | health_code_update(); |
625 | ||
d2956687 | 626 | pthread_mutex_lock(&channel->lock); |
ffe60014 DG |
627 | new_stream = consumer_allocate_stream(channel->key, |
628 | fd, | |
ffe60014 | 629 | channel->name, |
ffe60014 DG |
630 | channel->relayd_id, |
631 | channel->session_id, | |
d2956687 | 632 | channel->trace_chunk, |
ffe60014 DG |
633 | msg.u.stream.cpu, |
634 | &alloc_ret, | |
4891ece8 | 635 | channel->type, |
d2956687 | 636 | channel->monitor); |
3bd1e081 | 637 | if (new_stream == NULL) { |
c80048c6 MD |
638 | switch (alloc_ret) { |
639 | case -ENOMEM: | |
640 | case -EINVAL: | |
641 | default: | |
642 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
643 | break; | |
c80048c6 | 644 | } |
d2956687 | 645 | pthread_mutex_unlock(&channel->lock); |
c5c7998f | 646 | goto error_add_stream_nosignal; |
3bd1e081 | 647 | } |
d771f832 | 648 | |
ffe60014 DG |
649 | new_stream->chan = channel; |
650 | new_stream->wait_fd = fd; | |
d05185fa JG |
651 | ret = kernctl_get_max_subbuf_size(new_stream->wait_fd, |
652 | &new_stream->max_sb_size); | |
653 | if (ret < 0) { | |
654 | pthread_mutex_unlock(&channel->lock); | |
655 | ERR("Failed to get kernel maximal subbuffer size"); | |
c5c7998f | 656 | goto error_add_stream_nosignal; |
d05185fa JG |
657 | } |
658 | ||
d9a2e16e JD |
659 | consumer_stream_update_channel_attributes(new_stream, |
660 | channel); | |
07b86b52 JD |
661 | switch (channel->output) { |
662 | case CONSUMER_CHANNEL_SPLICE: | |
663 | new_stream->output = LTTNG_EVENT_SPLICE; | |
a2361a61 JD |
664 | ret = utils_create_pipe(new_stream->splice_pipe); |
665 | if (ret < 0) { | |
d2956687 | 666 | pthread_mutex_unlock(&channel->lock); |
c5c7998f | 667 | goto error_add_stream_nosignal; |
a2361a61 | 668 | } |
07b86b52 JD |
669 | break; |
670 | case CONSUMER_CHANNEL_MMAP: | |
671 | new_stream->output = LTTNG_EVENT_MMAP; | |
672 | break; | |
673 | default: | |
674 | ERR("Stream output unknown %d", channel->output); | |
d2956687 | 675 | pthread_mutex_unlock(&channel->lock); |
c5c7998f | 676 | goto error_add_stream_nosignal; |
07b86b52 | 677 | } |
00e2e675 | 678 | |
a0c83db9 DG |
679 | /* |
680 | * We've just assigned the channel to the stream so increment the | |
07b86b52 JD |
681 | * refcount right now. We don't need to increment the refcount for |
682 | * streams in no monitor because we handle manually the cleanup of | |
683 | * those. It is very important to make sure there is NO prior | |
684 | * consumer_del_stream() calls or else the refcount will be unbalanced. | |
a0c83db9 | 685 | */ |
07b86b52 JD |
686 | if (channel->monitor) { |
687 | uatomic_inc(&new_stream->chan->refcount); | |
688 | } | |
9d9353f9 | 689 | |
fb3a43a9 DG |
690 | /* |
691 | * The buffer flush is done on the session daemon side for the kernel | |
692 | * so no need for the stream "hangup_flush_done" variable to be | |
693 | * tracked. This is important for a kernel stream since we don't rely | |
694 | * on the flush state of the stream to read data. It's not the case for | |
695 | * user space tracing. | |
696 | */ | |
697 | new_stream->hangup_flush_done = 0; | |
698 | ||
9ce5646a MD |
699 | health_code_update(); |
700 | ||
d2956687 | 701 | pthread_mutex_lock(&new_stream->lock); |
633d0084 DG |
702 | if (ctx->on_recv_stream) { |
703 | ret = ctx->on_recv_stream(new_stream); | |
704 | if (ret < 0) { | |
d2956687 JG |
705 | pthread_mutex_unlock(&new_stream->lock); |
706 | pthread_mutex_unlock(&channel->lock); | |
d771f832 | 707 | consumer_stream_free(new_stream); |
c5c7998f | 708 | goto error_add_stream_nosignal; |
fb3a43a9 | 709 | } |
633d0084 | 710 | } |
9ce5646a MD |
711 | health_code_update(); |
712 | ||
07b86b52 JD |
713 | if (new_stream->metadata_flag) { |
714 | channel->metadata_stream = new_stream; | |
715 | } | |
716 | ||
2bba9e53 DG |
717 | /* Do not monitor this stream. */ |
718 | if (!channel->monitor) { | |
5eecee74 | 719 | DBG("Kernel consumer add stream %s in no monitor mode with " |
6dc3064a | 720 | "relayd id %" PRIu64, new_stream->name, |
5eecee74 | 721 | new_stream->net_seq_idx); |
10a50311 | 722 | cds_list_add(&new_stream->send_node, &channel->streams.head); |
d2956687 JG |
723 | pthread_mutex_unlock(&new_stream->lock); |
724 | pthread_mutex_unlock(&channel->lock); | |
c5c7998f | 725 | goto end_add_stream; |
6dc3064a DG |
726 | } |
727 | ||
e1b71bdc DG |
728 | /* Send stream to relayd if the stream has an ID. */ |
729 | if (new_stream->net_seq_idx != (uint64_t) -1ULL) { | |
194ee077 DG |
730 | ret = consumer_send_relayd_stream(new_stream, |
731 | new_stream->chan->pathname); | |
e1b71bdc | 732 | if (ret < 0) { |
d2956687 JG |
733 | pthread_mutex_unlock(&new_stream->lock); |
734 | pthread_mutex_unlock(&channel->lock); | |
e1b71bdc | 735 | consumer_stream_free(new_stream); |
c5c7998f | 736 | goto error_add_stream_nosignal; |
e1b71bdc | 737 | } |
001b7e62 MD |
738 | |
739 | /* | |
740 | * If adding an extra stream to an already | |
741 | * existing channel (e.g. cpu hotplug), we need | |
742 | * to send the "streams_sent" command to relayd. | |
743 | */ | |
744 | if (channel->streams_sent_to_relayd) { | |
745 | ret = consumer_send_relayd_streams_sent( | |
746 | new_stream->net_seq_idx); | |
747 | if (ret < 0) { | |
d2956687 JG |
748 | pthread_mutex_unlock(&new_stream->lock); |
749 | pthread_mutex_unlock(&channel->lock); | |
c5c7998f | 750 | goto error_add_stream_nosignal; |
001b7e62 MD |
751 | } |
752 | } | |
e2039c7a | 753 | } |
d2956687 JG |
754 | pthread_mutex_unlock(&new_stream->lock); |
755 | pthread_mutex_unlock(&channel->lock); | |
e2039c7a | 756 | |
50f8ae69 | 757 | /* Get the right pipe where the stream will be sent. */ |
633d0084 | 758 | if (new_stream->metadata_flag) { |
66d583dc | 759 | consumer_add_metadata_stream(new_stream); |
dae10966 | 760 | stream_pipe = ctx->consumer_metadata_pipe; |
3bd1e081 | 761 | } else { |
66d583dc | 762 | consumer_add_data_stream(new_stream); |
dae10966 | 763 | stream_pipe = ctx->consumer_data_pipe; |
50f8ae69 DG |
764 | } |
765 | ||
66d583dc | 766 | /* Visible to other threads */ |
5ab66908 MD |
767 | new_stream->globally_visible = 1; |
768 | ||
9ce5646a MD |
769 | health_code_update(); |
770 | ||
dae10966 | 771 | ret = lttng_pipe_write(stream_pipe, &new_stream, sizeof(new_stream)); |
50f8ae69 | 772 | if (ret < 0) { |
dae10966 | 773 | ERR("Consumer write %s stream to pipe %d", |
50f8ae69 | 774 | new_stream->metadata_flag ? "metadata" : "data", |
dae10966 | 775 | lttng_pipe_get_writefd(stream_pipe)); |
5ab66908 MD |
776 | if (new_stream->metadata_flag) { |
777 | consumer_del_stream_for_metadata(new_stream); | |
778 | } else { | |
779 | consumer_del_stream_for_data(new_stream); | |
780 | } | |
c5c7998f | 781 | goto error_add_stream_nosignal; |
3bd1e081 | 782 | } |
00e2e675 | 783 | |
02d02e31 JD |
784 | DBG("Kernel consumer ADD_STREAM %s (fd: %d) %s with relayd id %" PRIu64, |
785 | new_stream->name, fd, new_stream->chan->pathname, new_stream->relayd_stream_id); | |
c5c7998f | 786 | end_add_stream: |
3bd1e081 | 787 | break; |
c5c7998f JG |
788 | error_add_stream_nosignal: |
789 | goto end_nosignal; | |
790 | error_add_stream_fatal: | |
791 | goto error_fatal; | |
3bd1e081 | 792 | } |
a4baae1b JD |
793 | case LTTNG_CONSUMER_STREAMS_SENT: |
794 | { | |
795 | struct lttng_consumer_channel *channel; | |
796 | ||
797 | /* | |
798 | * Get stream's channel reference. Needed when adding the stream to the | |
799 | * global hash table. | |
800 | */ | |
801 | channel = consumer_find_channel(msg.u.sent_streams.channel_key); | |
802 | if (!channel) { | |
803 | /* | |
804 | * We could not find the channel. Can happen if cpu hotplug | |
805 | * happens while tearing down. | |
806 | */ | |
807 | ERR("Unable to find channel key %" PRIu64, | |
808 | msg.u.sent_streams.channel_key); | |
e462382a | 809 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
a4baae1b JD |
810 | } |
811 | ||
812 | health_code_update(); | |
813 | ||
814 | /* | |
815 | * Send status code to session daemon. | |
816 | */ | |
817 | ret = consumer_send_status_msg(sock, ret_code); | |
f261ad0a | 818 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
a4baae1b | 819 | /* Somehow, the session daemon is not responding anymore. */ |
80d5a658 | 820 | goto error_streams_sent_nosignal; |
a4baae1b JD |
821 | } |
822 | ||
823 | health_code_update(); | |
824 | ||
825 | /* | |
826 | * We should not send this message if we don't monitor the | |
827 | * streams in this channel. | |
828 | */ | |
829 | if (!channel->monitor) { | |
80d5a658 | 830 | goto end_error_streams_sent; |
a4baae1b JD |
831 | } |
832 | ||
833 | health_code_update(); | |
834 | /* Send stream to relayd if the stream has an ID. */ | |
835 | if (msg.u.sent_streams.net_seq_idx != (uint64_t) -1ULL) { | |
836 | ret = consumer_send_relayd_streams_sent( | |
837 | msg.u.sent_streams.net_seq_idx); | |
838 | if (ret < 0) { | |
80d5a658 | 839 | goto error_streams_sent_nosignal; |
a4baae1b | 840 | } |
001b7e62 | 841 | channel->streams_sent_to_relayd = true; |
a4baae1b | 842 | } |
80d5a658 | 843 | end_error_streams_sent: |
a4baae1b | 844 | break; |
80d5a658 JG |
845 | error_streams_sent_nosignal: |
846 | goto end_nosignal; | |
a4baae1b | 847 | } |
3bd1e081 MD |
848 | case LTTNG_CONSUMER_UPDATE_STREAM: |
849 | { | |
3f8e211f DG |
850 | rcu_read_unlock(); |
851 | return -ENOSYS; | |
852 | } | |
853 | case LTTNG_CONSUMER_DESTROY_RELAYD: | |
854 | { | |
a6ba4fe1 | 855 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
3f8e211f DG |
856 | struct consumer_relayd_sock_pair *relayd; |
857 | ||
a6ba4fe1 | 858 | DBG("Kernel consumer destroying relayd %" PRIu64, index); |
3f8e211f DG |
859 | |
860 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 861 | relayd = consumer_find_relayd(index); |
3f8e211f | 862 | if (relayd == NULL) { |
3448e266 | 863 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 864 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
3bd1e081 | 865 | } |
3f8e211f | 866 | |
a6ba4fe1 DG |
867 | /* |
868 | * Each relayd socket pair has a refcount of stream attached to it | |
869 | * which tells if the relayd is still active or not depending on the | |
870 | * refcount value. | |
871 | * | |
872 | * This will set the destroy flag of the relayd object and destroy it | |
873 | * if the refcount reaches zero when called. | |
874 | * | |
875 | * The destroy can happen either here or when a stream fd hangs up. | |
876 | */ | |
f50f23d9 DG |
877 | if (relayd) { |
878 | consumer_flag_relayd_for_destroy(relayd); | |
879 | } | |
880 | ||
9ce5646a MD |
881 | health_code_update(); |
882 | ||
f50f23d9 DG |
883 | ret = consumer_send_status_msg(sock, ret_code); |
884 | if (ret < 0) { | |
885 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 886 | goto error_fatal; |
f50f23d9 | 887 | } |
3f8e211f | 888 | |
3f8e211f | 889 | goto end_nosignal; |
3bd1e081 | 890 | } |
6d805429 | 891 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 892 | { |
c8f59ee5 | 893 | int32_t ret; |
6d805429 | 894 | uint64_t id = msg.u.data_pending.session_id; |
c8f59ee5 | 895 | |
6d805429 | 896 | DBG("Kernel consumer data pending command for id %" PRIu64, id); |
c8f59ee5 | 897 | |
6d805429 | 898 | ret = consumer_data_pending(id); |
c8f59ee5 | 899 | |
9ce5646a MD |
900 | health_code_update(); |
901 | ||
c8f59ee5 DG |
902 | /* Send back returned value to session daemon */ |
903 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
904 | if (ret < 0) { | |
6d805429 | 905 | PERROR("send data pending ret code"); |
1803a064 | 906 | goto error_fatal; |
c8f59ee5 | 907 | } |
f50f23d9 DG |
908 | |
909 | /* | |
910 | * No need to send back a status message since the data pending | |
911 | * returned value is the response. | |
912 | */ | |
c8f59ee5 | 913 | break; |
53632229 | 914 | } |
6dc3064a DG |
915 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
916 | { | |
3eb928aa MD |
917 | struct lttng_consumer_channel *channel; |
918 | uint64_t key = msg.u.snapshot_channel.key; | |
919 | ||
920 | channel = consumer_find_channel(key); | |
921 | if (!channel) { | |
922 | ERR("Channel %" PRIu64 " not found", key); | |
923 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
07b86b52 | 924 | } else { |
d2956687 | 925 | pthread_mutex_lock(&channel->lock); |
3eb928aa MD |
926 | if (msg.u.snapshot_channel.metadata == 1) { |
927 | ret = lttng_kconsumer_snapshot_metadata(channel, key, | |
928 | msg.u.snapshot_channel.pathname, | |
929 | msg.u.snapshot_channel.relayd_id, ctx); | |
930 | if (ret < 0) { | |
931 | ERR("Snapshot metadata failed"); | |
932 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
933 | } | |
934 | } else { | |
935 | ret = lttng_kconsumer_snapshot_channel(channel, key, | |
936 | msg.u.snapshot_channel.pathname, | |
937 | msg.u.snapshot_channel.relayd_id, | |
938 | msg.u.snapshot_channel.nb_packets_per_stream, | |
939 | ctx); | |
940 | if (ret < 0) { | |
941 | ERR("Snapshot channel failed"); | |
942 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
943 | } | |
07b86b52 | 944 | } |
d2956687 | 945 | pthread_mutex_unlock(&channel->lock); |
07b86b52 | 946 | } |
9ce5646a MD |
947 | health_code_update(); |
948 | ||
6dc3064a DG |
949 | ret = consumer_send_status_msg(sock, ret_code); |
950 | if (ret < 0) { | |
951 | /* Somehow, the session daemon is not responding anymore. */ | |
952 | goto end_nosignal; | |
953 | } | |
954 | break; | |
955 | } | |
07b86b52 JD |
956 | case LTTNG_CONSUMER_DESTROY_CHANNEL: |
957 | { | |
958 | uint64_t key = msg.u.destroy_channel.key; | |
959 | struct lttng_consumer_channel *channel; | |
960 | ||
961 | channel = consumer_find_channel(key); | |
962 | if (!channel) { | |
963 | ERR("Kernel consumer destroy channel %" PRIu64 " not found", key); | |
e462382a | 964 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
07b86b52 JD |
965 | } |
966 | ||
9ce5646a MD |
967 | health_code_update(); |
968 | ||
07b86b52 JD |
969 | ret = consumer_send_status_msg(sock, ret_code); |
970 | if (ret < 0) { | |
971 | /* Somehow, the session daemon is not responding anymore. */ | |
a9d36096 | 972 | goto end_destroy_channel; |
07b86b52 JD |
973 | } |
974 | ||
9ce5646a MD |
975 | health_code_update(); |
976 | ||
15dc512a DG |
977 | /* Stop right now if no channel was found. */ |
978 | if (!channel) { | |
a9d36096 | 979 | goto end_destroy_channel; |
15dc512a DG |
980 | } |
981 | ||
07b86b52 JD |
982 | /* |
983 | * This command should ONLY be issued for channel with streams set in | |
984 | * no monitor mode. | |
985 | */ | |
986 | assert(!channel->monitor); | |
987 | ||
988 | /* | |
989 | * The refcount should ALWAYS be 0 in the case of a channel in no | |
990 | * monitor mode. | |
991 | */ | |
992 | assert(!uatomic_sub_return(&channel->refcount, 1)); | |
993 | ||
994 | consumer_del_channel(channel); | |
a9d36096 | 995 | end_destroy_channel: |
07b86b52 JD |
996 | goto end_nosignal; |
997 | } | |
fb83fe64 JD |
998 | case LTTNG_CONSUMER_DISCARDED_EVENTS: |
999 | { | |
66ab32be JD |
1000 | ssize_t ret; |
1001 | uint64_t count; | |
fb83fe64 JD |
1002 | struct lttng_consumer_channel *channel; |
1003 | uint64_t id = msg.u.discarded_events.session_id; | |
1004 | uint64_t key = msg.u.discarded_events.channel_key; | |
1005 | ||
e5742757 MD |
1006 | DBG("Kernel consumer discarded events command for session id %" |
1007 | PRIu64 ", channel key %" PRIu64, id, key); | |
1008 | ||
fb83fe64 JD |
1009 | channel = consumer_find_channel(key); |
1010 | if (!channel) { | |
1011 | ERR("Kernel consumer discarded events channel %" | |
1012 | PRIu64 " not found", key); | |
66ab32be | 1013 | count = 0; |
e5742757 | 1014 | } else { |
66ab32be | 1015 | count = channel->discarded_events; |
fb83fe64 JD |
1016 | } |
1017 | ||
fb83fe64 JD |
1018 | health_code_update(); |
1019 | ||
1020 | /* Send back returned value to session daemon */ | |
66ab32be | 1021 | ret = lttcomm_send_unix_sock(sock, &count, sizeof(count)); |
fb83fe64 JD |
1022 | if (ret < 0) { |
1023 | PERROR("send discarded events"); | |
1024 | goto error_fatal; | |
1025 | } | |
1026 | ||
1027 | break; | |
1028 | } | |
1029 | case LTTNG_CONSUMER_LOST_PACKETS: | |
1030 | { | |
66ab32be JD |
1031 | ssize_t ret; |
1032 | uint64_t count; | |
fb83fe64 JD |
1033 | struct lttng_consumer_channel *channel; |
1034 | uint64_t id = msg.u.lost_packets.session_id; | |
1035 | uint64_t key = msg.u.lost_packets.channel_key; | |
1036 | ||
e5742757 MD |
1037 | DBG("Kernel consumer lost packets command for session id %" |
1038 | PRIu64 ", channel key %" PRIu64, id, key); | |
1039 | ||
fb83fe64 JD |
1040 | channel = consumer_find_channel(key); |
1041 | if (!channel) { | |
1042 | ERR("Kernel consumer lost packets channel %" | |
1043 | PRIu64 " not found", key); | |
66ab32be | 1044 | count = 0; |
e5742757 | 1045 | } else { |
66ab32be | 1046 | count = channel->lost_packets; |
fb83fe64 JD |
1047 | } |
1048 | ||
fb83fe64 JD |
1049 | health_code_update(); |
1050 | ||
1051 | /* Send back returned value to session daemon */ | |
66ab32be | 1052 | ret = lttcomm_send_unix_sock(sock, &count, sizeof(count)); |
fb83fe64 JD |
1053 | if (ret < 0) { |
1054 | PERROR("send lost packets"); | |
1055 | goto error_fatal; | |
1056 | } | |
1057 | ||
1058 | break; | |
1059 | } | |
b3530820 JG |
1060 | case LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE: |
1061 | { | |
1062 | int channel_monitor_pipe; | |
1063 | ||
1064 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1065 | /* Successfully received the command's type. */ | |
1066 | ret = consumer_send_status_msg(sock, ret_code); | |
1067 | if (ret < 0) { | |
1068 | goto error_fatal; | |
1069 | } | |
1070 | ||
1071 | ret = lttcomm_recv_fds_unix_sock(sock, &channel_monitor_pipe, | |
1072 | 1); | |
1073 | if (ret != sizeof(channel_monitor_pipe)) { | |
1074 | ERR("Failed to receive channel monitor pipe"); | |
1075 | goto error_fatal; | |
1076 | } | |
1077 | ||
1078 | DBG("Received channel monitor pipe (%d)", channel_monitor_pipe); | |
1079 | ret = consumer_timer_thread_set_channel_monitor_pipe( | |
1080 | channel_monitor_pipe); | |
1081 | if (!ret) { | |
1082 | int flags; | |
1083 | ||
1084 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1085 | /* Set the pipe as non-blocking. */ | |
1086 | ret = fcntl(channel_monitor_pipe, F_GETFL, 0); | |
1087 | if (ret == -1) { | |
1088 | PERROR("fcntl get flags of the channel monitoring pipe"); | |
1089 | goto error_fatal; | |
1090 | } | |
1091 | flags = ret; | |
1092 | ||
1093 | ret = fcntl(channel_monitor_pipe, F_SETFL, | |
1094 | flags | O_NONBLOCK); | |
1095 | if (ret == -1) { | |
1096 | PERROR("fcntl set O_NONBLOCK flag of the channel monitoring pipe"); | |
1097 | goto error_fatal; | |
1098 | } | |
1099 | DBG("Channel monitor pipe set as non-blocking"); | |
1100 | } else { | |
1101 | ret_code = LTTCOMM_CONSUMERD_ALREADY_SET; | |
1102 | } | |
1103 | ret = consumer_send_status_msg(sock, ret_code); | |
1104 | if (ret < 0) { | |
1105 | goto error_fatal; | |
1106 | } | |
1107 | break; | |
1108 | } | |
b99a8d42 JD |
1109 | case LTTNG_CONSUMER_ROTATE_CHANNEL: |
1110 | { | |
92b7a7f8 MD |
1111 | struct lttng_consumer_channel *channel; |
1112 | uint64_t key = msg.u.rotate_channel.key; | |
b99a8d42 | 1113 | |
92b7a7f8 | 1114 | DBG("Consumer rotate channel %" PRIu64, key); |
b99a8d42 | 1115 | |
92b7a7f8 MD |
1116 | channel = consumer_find_channel(key); |
1117 | if (!channel) { | |
1118 | ERR("Channel %" PRIu64 " not found", key); | |
1119 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
1120 | } else { | |
1121 | /* | |
1122 | * Sample the rotate position of all the streams in this channel. | |
1123 | */ | |
1124 | ret = lttng_consumer_rotate_channel(channel, key, | |
92b7a7f8 MD |
1125 | msg.u.rotate_channel.relayd_id, |
1126 | msg.u.rotate_channel.metadata, | |
92b7a7f8 MD |
1127 | ctx); |
1128 | if (ret < 0) { | |
1129 | ERR("Rotate channel failed"); | |
1130 | ret_code = LTTCOMM_CONSUMERD_ROTATION_FAIL; | |
1131 | } | |
b99a8d42 | 1132 | |
92b7a7f8 MD |
1133 | health_code_update(); |
1134 | } | |
b99a8d42 JD |
1135 | ret = consumer_send_status_msg(sock, ret_code); |
1136 | if (ret < 0) { | |
1137 | /* Somehow, the session daemon is not responding anymore. */ | |
713bdd26 | 1138 | goto error_rotate_channel; |
b99a8d42 | 1139 | } |
92b7a7f8 MD |
1140 | if (channel) { |
1141 | /* Rotate the streams that are ready right now. */ | |
1142 | ret = lttng_consumer_rotate_ready_streams( | |
1143 | channel, key, ctx); | |
1144 | if (ret < 0) { | |
1145 | ERR("Rotate ready streams failed"); | |
1146 | } | |
b99a8d42 | 1147 | } |
b99a8d42 | 1148 | break; |
713bdd26 JG |
1149 | error_rotate_channel: |
1150 | goto end_nosignal; | |
b99a8d42 | 1151 | } |
5f3aff8b MD |
1152 | case LTTNG_CONSUMER_CLEAR_CHANNEL: |
1153 | { | |
1154 | struct lttng_consumer_channel *channel; | |
1155 | uint64_t key = msg.u.clear_channel.key; | |
1156 | ||
1157 | channel = consumer_find_channel(key); | |
1158 | if (!channel) { | |
1159 | DBG("Channel %" PRIu64 " not found", key); | |
1160 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
1161 | } else { | |
1162 | ret = lttng_consumer_clear_channel(channel); | |
1163 | if (ret) { | |
1164 | ERR("Clear channel failed"); | |
1165 | ret_code = ret; | |
1166 | } | |
1167 | ||
1168 | health_code_update(); | |
1169 | } | |
1170 | ret = consumer_send_status_msg(sock, ret_code); | |
1171 | if (ret < 0) { | |
1172 | /* Somehow, the session daemon is not responding anymore. */ | |
1173 | goto end_nosignal; | |
1174 | } | |
1175 | ||
1176 | break; | |
1177 | } | |
d2956687 | 1178 | case LTTNG_CONSUMER_INIT: |
00fb02ac | 1179 | { |
d2956687 JG |
1180 | ret_code = lttng_consumer_init_command(ctx, |
1181 | msg.u.init.sessiond_uuid); | |
00fb02ac | 1182 | health_code_update(); |
00fb02ac JD |
1183 | ret = consumer_send_status_msg(sock, ret_code); |
1184 | if (ret < 0) { | |
1185 | /* Somehow, the session daemon is not responding anymore. */ | |
1186 | goto end_nosignal; | |
1187 | } | |
1188 | break; | |
1189 | } | |
d2956687 | 1190 | case LTTNG_CONSUMER_CREATE_TRACE_CHUNK: |
d88744a4 | 1191 | { |
d2956687 | 1192 | const struct lttng_credentials credentials = { |
e5add6d0 JG |
1193 | .uid = msg.u.create_trace_chunk.credentials.value.uid, |
1194 | .gid = msg.u.create_trace_chunk.credentials.value.gid, | |
d2956687 JG |
1195 | }; |
1196 | const bool is_local_trace = | |
1197 | !msg.u.create_trace_chunk.relayd_id.is_set; | |
1198 | const uint64_t relayd_id = | |
1199 | msg.u.create_trace_chunk.relayd_id.value; | |
1200 | const char *chunk_override_name = | |
1201 | *msg.u.create_trace_chunk.override_name ? | |
1202 | msg.u.create_trace_chunk.override_name : | |
1203 | NULL; | |
cbf53d23 | 1204 | struct lttng_directory_handle *chunk_directory_handle = NULL; |
d88744a4 | 1205 | |
d2956687 JG |
1206 | /* |
1207 | * The session daemon will only provide a chunk directory file | |
1208 | * descriptor for local traces. | |
1209 | */ | |
1210 | if (is_local_trace) { | |
1211 | int chunk_dirfd; | |
19990ed5 | 1212 | |
d2956687 JG |
1213 | /* Acnowledge the reception of the command. */ |
1214 | ret = consumer_send_status_msg(sock, | |
1215 | LTTCOMM_CONSUMERD_SUCCESS); | |
1216 | if (ret < 0) { | |
1217 | /* Somehow, the session daemon is not responding anymore. */ | |
1218 | goto end_nosignal; | |
1219 | } | |
92816cc3 | 1220 | |
d2956687 JG |
1221 | ret = lttcomm_recv_fds_unix_sock(sock, &chunk_dirfd, 1); |
1222 | if (ret != sizeof(chunk_dirfd)) { | |
1223 | ERR("Failed to receive trace chunk directory file descriptor"); | |
1224 | goto error_fatal; | |
1225 | } | |
92816cc3 | 1226 | |
d2956687 JG |
1227 | DBG("Received trace chunk directory fd (%d)", |
1228 | chunk_dirfd); | |
cbf53d23 | 1229 | chunk_directory_handle = lttng_directory_handle_create_from_dirfd( |
d2956687 | 1230 | chunk_dirfd); |
cbf53d23 | 1231 | if (!chunk_directory_handle) { |
d2956687 JG |
1232 | ERR("Failed to initialize chunk directory handle from directory file descriptor"); |
1233 | if (close(chunk_dirfd)) { | |
1234 | PERROR("Failed to close chunk directory file descriptor"); | |
1235 | } | |
1236 | goto error_fatal; | |
1237 | } | |
92816cc3 JG |
1238 | } |
1239 | ||
d2956687 JG |
1240 | ret_code = lttng_consumer_create_trace_chunk( |
1241 | !is_local_trace ? &relayd_id : NULL, | |
1242 | msg.u.create_trace_chunk.session_id, | |
1243 | msg.u.create_trace_chunk.chunk_id, | |
e5add6d0 JG |
1244 | (time_t) msg.u.create_trace_chunk |
1245 | .creation_timestamp, | |
d2956687 | 1246 | chunk_override_name, |
e5add6d0 JG |
1247 | msg.u.create_trace_chunk.credentials.is_set ? |
1248 | &credentials : | |
1249 | NULL, | |
cbf53d23 JG |
1250 | chunk_directory_handle); |
1251 | lttng_directory_handle_put(chunk_directory_handle); | |
d2956687 | 1252 | goto end_msg_sessiond; |
d88744a4 | 1253 | } |
d2956687 | 1254 | case LTTNG_CONSUMER_CLOSE_TRACE_CHUNK: |
a1ae2ea5 | 1255 | { |
bbc4768c JG |
1256 | enum lttng_trace_chunk_command_type close_command = |
1257 | msg.u.close_trace_chunk.close_command.value; | |
d2956687 JG |
1258 | const uint64_t relayd_id = |
1259 | msg.u.close_trace_chunk.relayd_id.value; | |
ecd1a12f MD |
1260 | struct lttcomm_consumer_close_trace_chunk_reply reply; |
1261 | char path[LTTNG_PATH_MAX]; | |
d2956687 JG |
1262 | |
1263 | ret_code = lttng_consumer_close_trace_chunk( | |
1264 | msg.u.close_trace_chunk.relayd_id.is_set ? | |
bbc4768c JG |
1265 | &relayd_id : |
1266 | NULL, | |
d2956687 JG |
1267 | msg.u.close_trace_chunk.session_id, |
1268 | msg.u.close_trace_chunk.chunk_id, | |
bbc4768c JG |
1269 | (time_t) msg.u.close_trace_chunk.close_timestamp, |
1270 | msg.u.close_trace_chunk.close_command.is_set ? | |
1271 | &close_command : | |
ecd1a12f MD |
1272 | NULL, path); |
1273 | reply.ret_code = ret_code; | |
1274 | reply.path_length = strlen(path) + 1; | |
1275 | ret = lttcomm_send_unix_sock(sock, &reply, sizeof(reply)); | |
1276 | if (ret != sizeof(reply)) { | |
1277 | goto error_fatal; | |
1278 | } | |
1279 | ret = lttcomm_send_unix_sock(sock, path, reply.path_length); | |
1280 | if (ret != reply.path_length) { | |
1281 | goto error_fatal; | |
1282 | } | |
1283 | goto end_nosignal; | |
3654ed19 | 1284 | } |
d2956687 | 1285 | case LTTNG_CONSUMER_TRACE_CHUNK_EXISTS: |
3654ed19 | 1286 | { |
d2956687 JG |
1287 | const uint64_t relayd_id = |
1288 | msg.u.trace_chunk_exists.relayd_id.value; | |
1289 | ||
1290 | ret_code = lttng_consumer_trace_chunk_exists( | |
1291 | msg.u.trace_chunk_exists.relayd_id.is_set ? | |
1292 | &relayd_id : NULL, | |
1293 | msg.u.trace_chunk_exists.session_id, | |
1294 | msg.u.trace_chunk_exists.chunk_id); | |
1295 | goto end_msg_sessiond; | |
a1ae2ea5 | 1296 | } |
3bd1e081 | 1297 | default: |
3f8e211f | 1298 | goto end_nosignal; |
3bd1e081 | 1299 | } |
3f8e211f | 1300 | |
3bd1e081 | 1301 | end_nosignal: |
4cbc1a04 DG |
1302 | /* |
1303 | * Return 1 to indicate success since the 0 value can be a socket | |
1304 | * shutdown during the recv() or send() call. | |
1305 | */ | |
c5c7998f JG |
1306 | ret = 1; |
1307 | goto end; | |
1308 | error_fatal: | |
1309 | /* This will issue a consumer stop. */ | |
1310 | ret = -1; | |
1311 | goto end; | |
d2956687 JG |
1312 | end_msg_sessiond: |
1313 | /* | |
1314 | * The returned value here is not useful since either way we'll return 1 to | |
1315 | * the caller because the session daemon socket management is done | |
1316 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. | |
1317 | */ | |
1318 | ret = consumer_send_status_msg(sock, ret_code); | |
1319 | if (ret < 0) { | |
1320 | goto error_fatal; | |
1321 | } | |
c5c7998f JG |
1322 | ret = 1; |
1323 | end: | |
d2956687 | 1324 | health_code_update(); |
1803a064 | 1325 | rcu_read_unlock(); |
c5c7998f | 1326 | return ret; |
3bd1e081 | 1327 | } |
d41f73b7 | 1328 | |
309167d2 JD |
1329 | /* |
1330 | * Populate index values of a kernel stream. Values are set in big endian order. | |
1331 | * | |
1332 | * Return 0 on success or else a negative value. | |
1333 | */ | |
50adc264 | 1334 | static int get_index_values(struct ctf_packet_index *index, int infd) |
309167d2 JD |
1335 | { |
1336 | int ret; | |
85d1db9f JG |
1337 | uint64_t packet_size, content_size, timestamp_begin, timestamp_end, |
1338 | events_discarded, stream_id, stream_instance_id, | |
1339 | packet_seq_num; | |
309167d2 | 1340 | |
85d1db9f | 1341 | ret = kernctl_get_timestamp_begin(infd, ×tamp_begin); |
309167d2 JD |
1342 | if (ret < 0) { |
1343 | PERROR("kernctl_get_timestamp_begin"); | |
1344 | goto error; | |
1345 | } | |
309167d2 | 1346 | |
85d1db9f | 1347 | ret = kernctl_get_timestamp_end(infd, ×tamp_end); |
309167d2 JD |
1348 | if (ret < 0) { |
1349 | PERROR("kernctl_get_timestamp_end"); | |
1350 | goto error; | |
1351 | } | |
309167d2 | 1352 | |
85d1db9f | 1353 | ret = kernctl_get_events_discarded(infd, &events_discarded); |
309167d2 JD |
1354 | if (ret < 0) { |
1355 | PERROR("kernctl_get_events_discarded"); | |
1356 | goto error; | |
1357 | } | |
309167d2 | 1358 | |
85d1db9f | 1359 | ret = kernctl_get_content_size(infd, &content_size); |
309167d2 JD |
1360 | if (ret < 0) { |
1361 | PERROR("kernctl_get_content_size"); | |
1362 | goto error; | |
1363 | } | |
309167d2 | 1364 | |
85d1db9f | 1365 | ret = kernctl_get_packet_size(infd, &packet_size); |
309167d2 JD |
1366 | if (ret < 0) { |
1367 | PERROR("kernctl_get_packet_size"); | |
1368 | goto error; | |
1369 | } | |
309167d2 | 1370 | |
85d1db9f | 1371 | ret = kernctl_get_stream_id(infd, &stream_id); |
309167d2 JD |
1372 | if (ret < 0) { |
1373 | PERROR("kernctl_get_stream_id"); | |
1374 | goto error; | |
1375 | } | |
309167d2 | 1376 | |
85d1db9f | 1377 | ret = kernctl_get_instance_id(infd, &stream_instance_id); |
234cd636 | 1378 | if (ret < 0) { |
f0b03c22 MD |
1379 | if (ret == -ENOTTY) { |
1380 | /* Command not implemented by lttng-modules. */ | |
85d1db9f | 1381 | stream_instance_id = -1ULL; |
f0b03c22 MD |
1382 | } else { |
1383 | PERROR("kernctl_get_instance_id"); | |
1384 | goto error; | |
1385 | } | |
234cd636 | 1386 | } |
234cd636 | 1387 | |
85d1db9f | 1388 | ret = kernctl_get_sequence_number(infd, &packet_seq_num); |
234cd636 | 1389 | if (ret < 0) { |
f0b03c22 MD |
1390 | if (ret == -ENOTTY) { |
1391 | /* Command not implemented by lttng-modules. */ | |
85d1db9f | 1392 | packet_seq_num = -1ULL; |
f0b03c22 MD |
1393 | ret = 0; |
1394 | } else { | |
1395 | PERROR("kernctl_get_sequence_number"); | |
1396 | goto error; | |
1397 | } | |
234cd636 JD |
1398 | } |
1399 | index->packet_seq_num = htobe64(index->packet_seq_num); | |
1400 | ||
85d1db9f JG |
1401 | *index = (typeof(*index)) { |
1402 | .offset = index->offset, | |
1403 | .packet_size = htobe64(packet_size), | |
1404 | .content_size = htobe64(content_size), | |
1405 | .timestamp_begin = htobe64(timestamp_begin), | |
1406 | .timestamp_end = htobe64(timestamp_end), | |
1407 | .events_discarded = htobe64(events_discarded), | |
1408 | .stream_id = htobe64(stream_id), | |
1409 | .stream_instance_id = htobe64(stream_instance_id), | |
1410 | .packet_seq_num = htobe64(packet_seq_num), | |
1411 | }; | |
1412 | ||
309167d2 JD |
1413 | error: |
1414 | return ret; | |
1415 | } | |
94d49140 JD |
1416 | /* |
1417 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
1418 | * metadata thread can consumer them. | |
1419 | * | |
1420 | * Metadata stream lock MUST be acquired. | |
1421 | * | |
1422 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream | |
1423 | * is empty or a negative value on error. | |
1424 | */ | |
1425 | int lttng_kconsumer_sync_metadata(struct lttng_consumer_stream *metadata) | |
1426 | { | |
1427 | int ret; | |
1428 | ||
1429 | assert(metadata); | |
1430 | ||
1431 | ret = kernctl_buffer_flush(metadata->wait_fd); | |
1432 | if (ret < 0) { | |
1433 | ERR("Failed to flush kernel stream"); | |
1434 | goto end; | |
1435 | } | |
1436 | ||
1437 | ret = kernctl_snapshot(metadata->wait_fd); | |
1438 | if (ret < 0) { | |
32af2c95 | 1439 | if (ret != -EAGAIN) { |
94d49140 JD |
1440 | ERR("Sync metadata, taking kernel snapshot failed."); |
1441 | goto end; | |
1442 | } | |
1443 | DBG("Sync metadata, no new kernel metadata"); | |
1444 | /* No new metadata, exit. */ | |
1445 | ret = ENODATA; | |
1446 | goto end; | |
1447 | } | |
1448 | ||
1449 | end: | |
1450 | return ret; | |
1451 | } | |
309167d2 | 1452 | |
fb83fe64 JD |
1453 | static |
1454 | int update_stream_stats(struct lttng_consumer_stream *stream) | |
1455 | { | |
1456 | int ret; | |
1457 | uint64_t seq, discarded; | |
1458 | ||
1459 | ret = kernctl_get_sequence_number(stream->wait_fd, &seq); | |
1460 | if (ret < 0) { | |
f0b03c22 MD |
1461 | if (ret == -ENOTTY) { |
1462 | /* Command not implemented by lttng-modules. */ | |
1463 | seq = -1ULL; | |
a40a503f | 1464 | stream->sequence_number_unavailable = true; |
f0b03c22 MD |
1465 | } else { |
1466 | PERROR("kernctl_get_sequence_number"); | |
1467 | goto end; | |
1468 | } | |
fb83fe64 JD |
1469 | } |
1470 | ||
1471 | /* | |
1472 | * Start the sequence when we extract the first packet in case we don't | |
1473 | * start at 0 (for example if a consumer is not connected to the | |
1474 | * session immediately after the beginning). | |
1475 | */ | |
1476 | if (stream->last_sequence_number == -1ULL) { | |
1477 | stream->last_sequence_number = seq; | |
1478 | } else if (seq > stream->last_sequence_number) { | |
1479 | stream->chan->lost_packets += seq - | |
1480 | stream->last_sequence_number - 1; | |
1481 | } else { | |
1482 | /* seq <= last_sequence_number */ | |
1483 | ERR("Sequence number inconsistent : prev = %" PRIu64 | |
1484 | ", current = %" PRIu64, | |
1485 | stream->last_sequence_number, seq); | |
1486 | ret = -1; | |
1487 | goto end; | |
1488 | } | |
1489 | stream->last_sequence_number = seq; | |
1490 | ||
1491 | ret = kernctl_get_events_discarded(stream->wait_fd, &discarded); | |
1492 | if (ret < 0) { | |
1493 | PERROR("kernctl_get_events_discarded"); | |
1494 | goto end; | |
1495 | } | |
1496 | if (discarded < stream->last_discarded_events) { | |
1497 | /* | |
83f4233d MJ |
1498 | * Overflow has occurred. We assume only one wrap-around |
1499 | * has occurred. | |
fb83fe64 JD |
1500 | */ |
1501 | stream->chan->discarded_events += (1ULL << (CAA_BITS_PER_LONG - 1)) - | |
1502 | stream->last_discarded_events + discarded; | |
1503 | } else { | |
1504 | stream->chan->discarded_events += discarded - | |
1505 | stream->last_discarded_events; | |
1506 | } | |
1507 | stream->last_discarded_events = discarded; | |
1508 | ret = 0; | |
1509 | ||
1510 | end: | |
1511 | return ret; | |
1512 | } | |
1513 | ||
93ec662e JD |
1514 | /* |
1515 | * Check if the local version of the metadata stream matches with the version | |
1516 | * of the metadata stream in the kernel. If it was updated, set the reset flag | |
1517 | * on the stream. | |
1518 | */ | |
1519 | static | |
1520 | int metadata_stream_check_version(int infd, struct lttng_consumer_stream *stream) | |
1521 | { | |
1522 | int ret; | |
1523 | uint64_t cur_version; | |
1524 | ||
1525 | ret = kernctl_get_metadata_version(infd, &cur_version); | |
1526 | if (ret < 0) { | |
f0b03c22 MD |
1527 | if (ret == -ENOTTY) { |
1528 | /* | |
1529 | * LTTng-modules does not implement this | |
1530 | * command. | |
1531 | */ | |
1532 | ret = 0; | |
1533 | goto end; | |
1534 | } | |
93ec662e JD |
1535 | ERR("Failed to get the metadata version"); |
1536 | goto end; | |
1537 | } | |
1538 | ||
1539 | if (stream->metadata_version == cur_version) { | |
1540 | ret = 0; | |
1541 | goto end; | |
1542 | } | |
1543 | ||
1544 | DBG("New metadata version detected"); | |
1545 | stream->metadata_version = cur_version; | |
1546 | stream->reset_metadata_flag = 1; | |
1547 | ret = 0; | |
1548 | ||
1549 | end: | |
1550 | return ret; | |
1551 | } | |
1552 | ||
d41f73b7 MD |
1553 | /* |
1554 | * Consume data on a file descriptor and write it on a trace file. | |
d2956687 | 1555 | * The stream and channel locks must be held by the caller. |
d41f73b7 | 1556 | */ |
4078b776 | 1557 | ssize_t lttng_kconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d2956687 | 1558 | struct lttng_consumer_local_data *ctx) |
d41f73b7 | 1559 | { |
1d4dfdef | 1560 | unsigned long len, subbuf_size, padding; |
02d02e31 | 1561 | int err, write_index = 1, rotation_ret; |
4078b776 | 1562 | ssize_t ret = 0; |
d41f73b7 | 1563 | int infd = stream->wait_fd; |
d3faab47 | 1564 | struct ctf_packet_index index = {}; |
d41f73b7 MD |
1565 | |
1566 | DBG("In read_subbuffer (infd : %d)", infd); | |
309167d2 | 1567 | |
02d02e31 JD |
1568 | /* |
1569 | * If the stream was flagged to be ready for rotation before we extract the | |
1570 | * next packet, rotate it now. | |
1571 | */ | |
1572 | if (stream->rotate_ready) { | |
1573 | DBG("Rotate stream before extracting data"); | |
d2956687 | 1574 | rotation_ret = lttng_consumer_rotate_stream(ctx, stream); |
02d02e31 JD |
1575 | if (rotation_ret < 0) { |
1576 | ERR("Stream rotation error"); | |
1577 | ret = -1; | |
1578 | goto error; | |
1579 | } | |
1580 | } | |
1581 | ||
d41f73b7 MD |
1582 | /* Get the next subbuffer */ |
1583 | err = kernctl_get_next_subbuf(infd); | |
1584 | if (err != 0) { | |
d41f73b7 MD |
1585 | /* |
1586 | * This is a debug message even for single-threaded consumer, | |
1587 | * because poll() have more relaxed criterions than get subbuf, | |
1588 | * so get_subbuf may fail for short race windows where poll() | |
1589 | * would issue wakeups. | |
1590 | */ | |
1591 | DBG("Reserving sub buffer failed (everything is normal, " | |
1592 | "it is due to concurrency)"); | |
32af2c95 | 1593 | ret = err; |
02d02e31 | 1594 | goto error; |
d41f73b7 MD |
1595 | } |
1596 | ||
1d4dfdef DG |
1597 | /* Get the full subbuffer size including padding */ |
1598 | err = kernctl_get_padded_subbuf_size(infd, &len); | |
1599 | if (err != 0) { | |
5a510c9f | 1600 | PERROR("Getting sub-buffer len failed."); |
8265f19e MD |
1601 | err = kernctl_put_subbuf(infd); |
1602 | if (err != 0) { | |
32af2c95 | 1603 | if (err == -EFAULT) { |
5a510c9f | 1604 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1605 | } else if (err == -EIO) { |
8265f19e | 1606 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1607 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e | 1608 | } |
32af2c95 | 1609 | ret = err; |
02d02e31 | 1610 | goto error; |
8265f19e | 1611 | } |
32af2c95 | 1612 | ret = err; |
02d02e31 | 1613 | goto error; |
1d4dfdef DG |
1614 | } |
1615 | ||
1c20f0e2 | 1616 | if (!stream->metadata_flag) { |
309167d2 JD |
1617 | ret = get_index_values(&index, infd); |
1618 | if (ret < 0) { | |
8265f19e MD |
1619 | err = kernctl_put_subbuf(infd); |
1620 | if (err != 0) { | |
32af2c95 | 1621 | if (err == -EFAULT) { |
5a510c9f | 1622 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1623 | } else if (err == -EIO) { |
8265f19e | 1624 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1625 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e | 1626 | } |
32af2c95 | 1627 | ret = err; |
02d02e31 | 1628 | goto error; |
8265f19e | 1629 | } |
02d02e31 | 1630 | goto error; |
309167d2 | 1631 | } |
fb83fe64 JD |
1632 | ret = update_stream_stats(stream); |
1633 | if (ret < 0) { | |
7b87473d MD |
1634 | err = kernctl_put_subbuf(infd); |
1635 | if (err != 0) { | |
1636 | if (err == -EFAULT) { | |
1637 | PERROR("Error in unreserving sub buffer\n"); | |
1638 | } else if (err == -EIO) { | |
1639 | /* Should never happen with newer LTTng versions */ | |
1640 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
1641 | } | |
1642 | ret = err; | |
02d02e31 | 1643 | goto error; |
7b87473d | 1644 | } |
02d02e31 | 1645 | goto error; |
fb83fe64 | 1646 | } |
1c20f0e2 JD |
1647 | } else { |
1648 | write_index = 0; | |
93ec662e JD |
1649 | ret = metadata_stream_check_version(infd, stream); |
1650 | if (ret < 0) { | |
7b87473d MD |
1651 | err = kernctl_put_subbuf(infd); |
1652 | if (err != 0) { | |
1653 | if (err == -EFAULT) { | |
1654 | PERROR("Error in unreserving sub buffer\n"); | |
1655 | } else if (err == -EIO) { | |
1656 | /* Should never happen with newer LTTng versions */ | |
1657 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
1658 | } | |
1659 | ret = err; | |
02d02e31 | 1660 | goto error; |
7b87473d | 1661 | } |
02d02e31 | 1662 | goto error; |
93ec662e | 1663 | } |
309167d2 JD |
1664 | } |
1665 | ||
ffe60014 | 1666 | switch (stream->chan->output) { |
07b86b52 | 1667 | case CONSUMER_CHANNEL_SPLICE: |
1d4dfdef DG |
1668 | /* |
1669 | * XXX: The lttng-modules splice "actor" does not handle copying | |
1670 | * partial pages hence only using the subbuffer size without the | |
1671 | * padding makes the splice fail. | |
1672 | */ | |
1673 | subbuf_size = len; | |
1674 | padding = 0; | |
1675 | ||
1676 | /* splice the subbuffer to the tracefile */ | |
91dfef6e | 1677 | ret = lttng_consumer_on_read_subbuffer_splice(ctx, stream, subbuf_size, |
309167d2 | 1678 | padding, &index); |
91dfef6e DG |
1679 | /* |
1680 | * XXX: Splice does not support network streaming so the return value | |
1681 | * is simply checked against subbuf_size and not like the mmap() op. | |
1682 | */ | |
1d4dfdef DG |
1683 | if (ret != subbuf_size) { |
1684 | /* | |
1685 | * display the error but continue processing to try | |
1686 | * to release the subbuffer | |
1687 | */ | |
1688 | ERR("Error splicing to tracefile (ret: %zd != len: %lu)", | |
1689 | ret, subbuf_size); | |
309167d2 | 1690 | write_index = 0; |
1d4dfdef DG |
1691 | } |
1692 | break; | |
07b86b52 | 1693 | case CONSUMER_CHANNEL_MMAP: |
1d4dfdef DG |
1694 | /* Get subbuffer size without padding */ |
1695 | err = kernctl_get_subbuf_size(infd, &subbuf_size); | |
1696 | if (err != 0) { | |
5a510c9f | 1697 | PERROR("Getting sub-buffer len failed."); |
8265f19e MD |
1698 | err = kernctl_put_subbuf(infd); |
1699 | if (err != 0) { | |
32af2c95 | 1700 | if (err == -EFAULT) { |
5a510c9f | 1701 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1702 | } else if (err == -EIO) { |
8265f19e | 1703 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1704 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e | 1705 | } |
32af2c95 | 1706 | ret = err; |
02d02e31 | 1707 | goto error; |
8265f19e | 1708 | } |
32af2c95 | 1709 | ret = err; |
02d02e31 | 1710 | goto error; |
1d4dfdef | 1711 | } |
47e81c02 | 1712 | |
1d4dfdef DG |
1713 | /* Make sure the tracer is not gone mad on us! */ |
1714 | assert(len >= subbuf_size); | |
1715 | ||
1716 | padding = len - subbuf_size; | |
1717 | ||
1718 | /* write the subbuffer to the tracefile */ | |
91dfef6e | 1719 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, |
309167d2 | 1720 | padding, &index); |
91dfef6e DG |
1721 | /* |
1722 | * The mmap operation should write subbuf_size amount of data when | |
1723 | * network streaming or the full padding (len) size when we are _not_ | |
1724 | * streaming. | |
1725 | */ | |
d88aee68 DG |
1726 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
1727 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
1d4dfdef | 1728 | /* |
91dfef6e | 1729 | * Display the error but continue processing to try to release the |
2336629e DG |
1730 | * subbuffer. This is a DBG statement since this is possible to |
1731 | * happen without being a critical error. | |
1d4dfdef | 1732 | */ |
2336629e | 1733 | DBG("Error writing to tracefile " |
91dfef6e DG |
1734 | "(ret: %zd != len: %lu != subbuf_size: %lu)", |
1735 | ret, len, subbuf_size); | |
309167d2 | 1736 | write_index = 0; |
1d4dfdef DG |
1737 | } |
1738 | break; | |
1739 | default: | |
1740 | ERR("Unknown output method"); | |
56591bac | 1741 | ret = -EPERM; |
d41f73b7 MD |
1742 | } |
1743 | ||
1744 | err = kernctl_put_next_subbuf(infd); | |
1745 | if (err != 0) { | |
32af2c95 | 1746 | if (err == -EFAULT) { |
5a510c9f | 1747 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1748 | } else if (err == -EIO) { |
d41f73b7 | 1749 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1750 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
d41f73b7 | 1751 | } |
32af2c95 | 1752 | ret = err; |
02d02e31 | 1753 | goto error; |
d41f73b7 MD |
1754 | } |
1755 | ||
309167d2 | 1756 | /* Write index if needed. */ |
1c20f0e2 | 1757 | if (!write_index) { |
02d02e31 | 1758 | goto rotate; |
1c20f0e2 JD |
1759 | } |
1760 | ||
94d49140 JD |
1761 | if (stream->chan->live_timer_interval && !stream->metadata_flag) { |
1762 | /* | |
1763 | * In live, block until all the metadata is sent. | |
1764 | */ | |
c585821b MD |
1765 | pthread_mutex_lock(&stream->metadata_timer_lock); |
1766 | assert(!stream->missed_metadata_flush); | |
1767 | stream->waiting_on_metadata = true; | |
1768 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1769 | ||
94d49140 | 1770 | err = consumer_stream_sync_metadata(ctx, stream->session_id); |
c585821b MD |
1771 | |
1772 | pthread_mutex_lock(&stream->metadata_timer_lock); | |
1773 | stream->waiting_on_metadata = false; | |
1774 | if (stream->missed_metadata_flush) { | |
1775 | stream->missed_metadata_flush = false; | |
1776 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1777 | (void) consumer_flush_kernel_index(stream); | |
1778 | } else { | |
1779 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1780 | } | |
94d49140 | 1781 | if (err < 0) { |
02d02e31 | 1782 | goto error; |
94d49140 JD |
1783 | } |
1784 | } | |
1785 | ||
1c20f0e2 JD |
1786 | err = consumer_stream_write_index(stream, &index); |
1787 | if (err < 0) { | |
02d02e31 | 1788 | goto error; |
309167d2 JD |
1789 | } |
1790 | ||
02d02e31 JD |
1791 | rotate: |
1792 | /* | |
1793 | * After extracting the packet, we check if the stream is now ready to be | |
1794 | * rotated and perform the action immediately. | |
1795 | */ | |
1796 | rotation_ret = lttng_consumer_stream_is_rotate_ready(stream); | |
1797 | if (rotation_ret == 1) { | |
d2956687 | 1798 | rotation_ret = lttng_consumer_rotate_stream(ctx, stream); |
02d02e31 JD |
1799 | if (rotation_ret < 0) { |
1800 | ERR("Stream rotation error"); | |
1801 | ret = -1; | |
1802 | goto error; | |
1803 | } | |
1804 | } else if (rotation_ret < 0) { | |
1805 | ERR("Checking if stream is ready to rotate"); | |
1806 | ret = -1; | |
1807 | goto error; | |
1808 | } | |
1809 | ||
1810 | error: | |
d41f73b7 MD |
1811 | return ret; |
1812 | } | |
1813 | ||
1814 | int lttng_kconsumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
1815 | { | |
1816 | int ret; | |
ffe60014 DG |
1817 | |
1818 | assert(stream); | |
1819 | ||
2bba9e53 | 1820 | /* |
d2956687 JG |
1821 | * Don't create anything if this is set for streaming or if there is |
1822 | * no current trace chunk on the parent channel. | |
2bba9e53 | 1823 | */ |
d2956687 JG |
1824 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor && |
1825 | stream->chan->trace_chunk) { | |
1826 | ret = consumer_stream_create_output_files(stream, true); | |
1827 | if (ret) { | |
fe4477ee JD |
1828 | goto error; |
1829 | } | |
ffe60014 | 1830 | } |
d41f73b7 | 1831 | |
d41f73b7 MD |
1832 | if (stream->output == LTTNG_EVENT_MMAP) { |
1833 | /* get the len of the mmap region */ | |
1834 | unsigned long mmap_len; | |
1835 | ||
1836 | ret = kernctl_get_mmap_len(stream->wait_fd, &mmap_len); | |
1837 | if (ret != 0) { | |
ffe60014 | 1838 | PERROR("kernctl_get_mmap_len"); |
d41f73b7 MD |
1839 | goto error_close_fd; |
1840 | } | |
1841 | stream->mmap_len = (size_t) mmap_len; | |
1842 | ||
ffe60014 DG |
1843 | stream->mmap_base = mmap(NULL, stream->mmap_len, PROT_READ, |
1844 | MAP_PRIVATE, stream->wait_fd, 0); | |
d41f73b7 | 1845 | if (stream->mmap_base == MAP_FAILED) { |
ffe60014 | 1846 | PERROR("Error mmaping"); |
d41f73b7 MD |
1847 | ret = -1; |
1848 | goto error_close_fd; | |
1849 | } | |
1850 | } | |
1851 | ||
1852 | /* we return 0 to let the library handle the FD internally */ | |
1853 | return 0; | |
1854 | ||
1855 | error_close_fd: | |
2f225ce2 | 1856 | if (stream->out_fd >= 0) { |
d41f73b7 MD |
1857 | int err; |
1858 | ||
1859 | err = close(stream->out_fd); | |
1860 | assert(!err); | |
2f225ce2 | 1861 | stream->out_fd = -1; |
d41f73b7 MD |
1862 | } |
1863 | error: | |
1864 | return ret; | |
1865 | } | |
1866 | ||
ca22feea DG |
1867 | /* |
1868 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
1869 | * stream. Consumer data lock MUST be acquired before calling this function |
1870 | * and the stream lock. | |
ca22feea | 1871 | * |
6d805429 | 1872 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
1873 | * data is available for trace viewer reading. |
1874 | */ | |
6d805429 | 1875 | int lttng_kconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
1876 | { |
1877 | int ret; | |
1878 | ||
1879 | assert(stream); | |
1880 | ||
873b9e9a MD |
1881 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
1882 | ret = 0; | |
1883 | goto end; | |
1884 | } | |
1885 | ||
ca22feea DG |
1886 | ret = kernctl_get_next_subbuf(stream->wait_fd); |
1887 | if (ret == 0) { | |
1888 | /* There is still data so let's put back this subbuffer. */ | |
1889 | ret = kernctl_put_subbuf(stream->wait_fd); | |
1890 | assert(ret == 0); | |
6d805429 | 1891 | ret = 1; /* Data is pending */ |
4e9a4686 | 1892 | goto end; |
ca22feea DG |
1893 | } |
1894 | ||
6d805429 DG |
1895 | /* Data is NOT pending and ready to be read. */ |
1896 | ret = 0; | |
ca22feea | 1897 | |
6efae65e DG |
1898 | end: |
1899 | return ret; | |
ca22feea | 1900 | } |