Commit | Line | Data |
---|---|---|
3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
b3530820 | 4 | * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
3bd1e081 | 5 | * |
d14d33bf AM |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License, version 2 only, | |
8 | * as published by the Free Software Foundation. | |
3bd1e081 MD |
9 | * |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
d14d33bf AM |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
3bd1e081 MD |
18 | */ |
19 | ||
6c1c0768 | 20 | #define _LGPL_SOURCE |
3bd1e081 | 21 | #include <assert.h> |
3bd1e081 MD |
22 | #include <poll.h> |
23 | #include <pthread.h> | |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | #include <sys/mman.h> | |
27 | #include <sys/socket.h> | |
28 | #include <sys/types.h> | |
77c7c900 | 29 | #include <inttypes.h> |
3bd1e081 | 30 | #include <unistd.h> |
dbb5dfe6 | 31 | #include <sys/stat.h> |
3bd1e081 | 32 | |
51a9e1c7 | 33 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 34 | #include <common/common.h> |
10a8a223 | 35 | #include <common/kernel-ctl/kernel-ctl.h> |
10a8a223 | 36 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 37 | #include <common/sessiond-comm/relayd.h> |
dbb5dfe6 | 38 | #include <common/compat/fcntl.h> |
f263b7fd | 39 | #include <common/compat/endian.h> |
acdb9057 | 40 | #include <common/pipe.h> |
00e2e675 | 41 | #include <common/relayd/relayd.h> |
fe4477ee | 42 | #include <common/utils.h> |
c8fea79c | 43 | #include <common/consumer/consumer-stream.h> |
309167d2 | 44 | #include <common/index/index.h> |
c8fea79c | 45 | #include <common/consumer/consumer-timer.h> |
0857097f | 46 | |
10a8a223 | 47 | #include "kernel-consumer.h" |
3bd1e081 MD |
48 | |
49 | extern struct lttng_consumer_global_data consumer_data; | |
50 | extern int consumer_poll_timeout; | |
51 | extern volatile int consumer_quit; | |
52 | ||
3bd1e081 MD |
53 | /* |
54 | * Take a snapshot for a specific fd | |
55 | * | |
56 | * Returns 0 on success, < 0 on error | |
57 | */ | |
ffe60014 | 58 | int lttng_kconsumer_take_snapshot(struct lttng_consumer_stream *stream) |
3bd1e081 MD |
59 | { |
60 | int ret = 0; | |
61 | int infd = stream->wait_fd; | |
62 | ||
63 | ret = kernctl_snapshot(infd); | |
64 | if (ret != 0) { | |
5a510c9f | 65 | PERROR("Getting sub-buffer snapshot."); |
3bd1e081 MD |
66 | } |
67 | ||
68 | return ret; | |
69 | } | |
70 | ||
71 | /* | |
72 | * Get the produced position | |
73 | * | |
74 | * Returns 0 on success, < 0 on error | |
75 | */ | |
ffe60014 | 76 | int lttng_kconsumer_get_produced_snapshot(struct lttng_consumer_stream *stream, |
3bd1e081 MD |
77 | unsigned long *pos) |
78 | { | |
79 | int ret; | |
80 | int infd = stream->wait_fd; | |
81 | ||
82 | ret = kernctl_snapshot_get_produced(infd, pos); | |
83 | if (ret != 0) { | |
5a510c9f | 84 | PERROR("kernctl_snapshot_get_produced"); |
3bd1e081 MD |
85 | } |
86 | ||
87 | return ret; | |
88 | } | |
89 | ||
07b86b52 JD |
90 | /* |
91 | * Get the consumerd position | |
92 | * | |
93 | * Returns 0 on success, < 0 on error | |
94 | */ | |
95 | int lttng_kconsumer_get_consumed_snapshot(struct lttng_consumer_stream *stream, | |
96 | unsigned long *pos) | |
97 | { | |
98 | int ret; | |
99 | int infd = stream->wait_fd; | |
100 | ||
101 | ret = kernctl_snapshot_get_consumed(infd, pos); | |
102 | if (ret != 0) { | |
5a510c9f | 103 | PERROR("kernctl_snapshot_get_consumed"); |
07b86b52 JD |
104 | } |
105 | ||
106 | return ret; | |
107 | } | |
108 | ||
07b86b52 JD |
109 | /* |
110 | * Take a snapshot of all the stream of a channel | |
111 | * | |
112 | * Returns 0 on success, < 0 on error | |
113 | */ | |
114 | int lttng_kconsumer_snapshot_channel(uint64_t key, char *path, | |
d07ceecd | 115 | uint64_t relayd_id, uint64_t nb_packets_per_stream, |
5c786ded | 116 | struct lttng_consumer_local_data *ctx) |
07b86b52 JD |
117 | { |
118 | int ret; | |
07b86b52 JD |
119 | struct lttng_consumer_channel *channel; |
120 | struct lttng_consumer_stream *stream; | |
121 | ||
6a00837f | 122 | DBG("Kernel consumer snapshot channel %" PRIu64, key); |
07b86b52 JD |
123 | |
124 | rcu_read_lock(); | |
125 | ||
126 | channel = consumer_find_channel(key); | |
127 | if (!channel) { | |
6a00837f | 128 | ERR("No channel found for key %" PRIu64, key); |
07b86b52 JD |
129 | ret = -1; |
130 | goto end; | |
131 | } | |
132 | ||
133 | /* Splice is not supported yet for channel snapshot. */ | |
134 | if (channel->output != CONSUMER_CHANNEL_MMAP) { | |
135 | ERR("Unsupported output %d", channel->output); | |
136 | ret = -1; | |
137 | goto end; | |
138 | } | |
139 | ||
10a50311 | 140 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { |
c13082a9 JD |
141 | /* Are we at a position _before_ the first available packet ? */ |
142 | bool before_first_packet = true; | |
923333cd | 143 | unsigned long consumed_pos, produced_pos; |
9ce5646a MD |
144 | |
145 | health_code_update(); | |
146 | ||
07b86b52 JD |
147 | /* |
148 | * Lock stream because we are about to change its state. | |
149 | */ | |
150 | pthread_mutex_lock(&stream->lock); | |
151 | ||
29decac3 DG |
152 | /* |
153 | * Assign the received relayd ID so we can use it for streaming. The streams | |
154 | * are not visible to anyone so this is OK to change it. | |
155 | */ | |
07b86b52 JD |
156 | stream->net_seq_idx = relayd_id; |
157 | channel->relayd_id = relayd_id; | |
158 | if (relayd_id != (uint64_t) -1ULL) { | |
10a50311 | 159 | ret = consumer_send_relayd_stream(stream, path); |
07b86b52 JD |
160 | if (ret < 0) { |
161 | ERR("sending stream to relayd"); | |
162 | goto end_unlock; | |
163 | } | |
07b86b52 JD |
164 | } else { |
165 | ret = utils_create_stream_file(path, stream->name, | |
10a50311 JD |
166 | stream->chan->tracefile_size, |
167 | stream->tracefile_count_current, | |
309167d2 | 168 | stream->uid, stream->gid, NULL); |
07b86b52 JD |
169 | if (ret < 0) { |
170 | ERR("utils_create_stream_file"); | |
171 | goto end_unlock; | |
172 | } | |
173 | ||
174 | stream->out_fd = ret; | |
175 | stream->tracefile_size_current = 0; | |
176 | ||
81ea21bf MD |
177 | DBG("Kernel consumer snapshot stream %s/%s (%" PRIu64 ")", |
178 | path, stream->name, stream->key); | |
07b86b52 | 179 | } |
601262d6 JD |
180 | if (relayd_id != -1ULL) { |
181 | ret = consumer_send_relayd_streams_sent(relayd_id); | |
182 | if (ret < 0) { | |
183 | ERR("sending streams sent to relayd"); | |
184 | goto end_unlock; | |
185 | } | |
a4baae1b | 186 | } |
07b86b52 JD |
187 | |
188 | ret = kernctl_buffer_flush(stream->wait_fd); | |
189 | if (ret < 0) { | |
10a50311 | 190 | ERR("Failed to flush kernel stream"); |
07b86b52 JD |
191 | goto end_unlock; |
192 | } | |
193 | ||
194 | ret = lttng_kconsumer_take_snapshot(stream); | |
195 | if (ret < 0) { | |
196 | ERR("Taking kernel snapshot"); | |
197 | goto end_unlock; | |
198 | } | |
199 | ||
200 | ret = lttng_kconsumer_get_produced_snapshot(stream, &produced_pos); | |
201 | if (ret < 0) { | |
202 | ERR("Produced kernel snapshot position"); | |
203 | goto end_unlock; | |
204 | } | |
205 | ||
206 | ret = lttng_kconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
207 | if (ret < 0) { | |
208 | ERR("Consumerd kernel snapshot position"); | |
209 | goto end_unlock; | |
210 | } | |
211 | ||
212 | if (stream->max_sb_size == 0) { | |
213 | ret = kernctl_get_max_subbuf_size(stream->wait_fd, | |
214 | &stream->max_sb_size); | |
215 | if (ret < 0) { | |
216 | ERR("Getting kernel max_sb_size"); | |
217 | goto end_unlock; | |
218 | } | |
219 | } | |
220 | ||
d07ceecd MD |
221 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
222 | produced_pos, nb_packets_per_stream, | |
223 | stream->max_sb_size); | |
5c786ded | 224 | |
07b86b52 JD |
225 | while (consumed_pos < produced_pos) { |
226 | ssize_t read_len; | |
227 | unsigned long len, padded_len; | |
c13082a9 | 228 | int lost_packet = 0; |
07b86b52 | 229 | |
9ce5646a MD |
230 | health_code_update(); |
231 | ||
07b86b52 JD |
232 | DBG("Kernel consumer taking snapshot at pos %lu", consumed_pos); |
233 | ||
234 | ret = kernctl_get_subbuf(stream->wait_fd, &consumed_pos); | |
235 | if (ret < 0) { | |
32af2c95 | 236 | if (ret != -EAGAIN) { |
07b86b52 JD |
237 | PERROR("kernctl_get_subbuf snapshot"); |
238 | goto end_unlock; | |
239 | } | |
240 | DBG("Kernel consumer get subbuf failed. Skipping it."); | |
241 | consumed_pos += stream->max_sb_size; | |
c13082a9 JD |
242 | |
243 | /* | |
244 | * Start accounting lost packets only when we | |
245 | * already have extracted packets (to match the | |
246 | * content of the final snapshot). | |
247 | */ | |
248 | if (!before_first_packet) { | |
249 | lost_packet = 1; | |
250 | } | |
07b86b52 JD |
251 | continue; |
252 | } | |
253 | ||
254 | ret = kernctl_get_subbuf_size(stream->wait_fd, &len); | |
255 | if (ret < 0) { | |
256 | ERR("Snapshot kernctl_get_subbuf_size"); | |
29decac3 | 257 | goto error_put_subbuf; |
07b86b52 JD |
258 | } |
259 | ||
260 | ret = kernctl_get_padded_subbuf_size(stream->wait_fd, &padded_len); | |
261 | if (ret < 0) { | |
262 | ERR("Snapshot kernctl_get_padded_subbuf_size"); | |
29decac3 | 263 | goto error_put_subbuf; |
07b86b52 JD |
264 | } |
265 | ||
266 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
309167d2 | 267 | padded_len - len, NULL); |
07b86b52 | 268 | /* |
29decac3 DG |
269 | * We write the padded len in local tracefiles but the data len |
270 | * when using a relay. Display the error but continue processing | |
271 | * to try to release the subbuffer. | |
07b86b52 JD |
272 | */ |
273 | if (relayd_id != (uint64_t) -1ULL) { | |
274 | if (read_len != len) { | |
275 | ERR("Error sending to the relay (ret: %zd != len: %lu)", | |
276 | read_len, len); | |
277 | } | |
278 | } else { | |
279 | if (read_len != padded_len) { | |
280 | ERR("Error writing to tracefile (ret: %zd != len: %lu)", | |
281 | read_len, padded_len); | |
282 | } | |
283 | } | |
284 | ||
285 | ret = kernctl_put_subbuf(stream->wait_fd); | |
286 | if (ret < 0) { | |
287 | ERR("Snapshot kernctl_put_subbuf"); | |
288 | goto end_unlock; | |
289 | } | |
290 | consumed_pos += stream->max_sb_size; | |
c13082a9 JD |
291 | |
292 | /* | |
293 | * Only account lost packets located between | |
294 | * succesfully extracted packets (do not account before | |
295 | * and after since they are not visible in the | |
296 | * resulting snapshot). | |
297 | */ | |
298 | stream->chan->lost_packets += lost_packet; | |
299 | lost_packet = 0; | |
300 | before_first_packet = false; | |
07b86b52 JD |
301 | } |
302 | ||
303 | if (relayd_id == (uint64_t) -1ULL) { | |
fdf9986c MD |
304 | if (stream->out_fd >= 0) { |
305 | ret = close(stream->out_fd); | |
306 | if (ret < 0) { | |
307 | PERROR("Kernel consumer snapshot close out_fd"); | |
308 | goto end_unlock; | |
309 | } | |
310 | stream->out_fd = -1; | |
07b86b52 | 311 | } |
07b86b52 JD |
312 | } else { |
313 | close_relayd_stream(stream); | |
314 | stream->net_seq_idx = (uint64_t) -1ULL; | |
315 | } | |
316 | pthread_mutex_unlock(&stream->lock); | |
317 | } | |
318 | ||
319 | /* All good! */ | |
320 | ret = 0; | |
321 | goto end; | |
322 | ||
29decac3 DG |
323 | error_put_subbuf: |
324 | ret = kernctl_put_subbuf(stream->wait_fd); | |
325 | if (ret < 0) { | |
326 | ERR("Snapshot kernctl_put_subbuf error path"); | |
327 | } | |
07b86b52 JD |
328 | end_unlock: |
329 | pthread_mutex_unlock(&stream->lock); | |
330 | end: | |
331 | rcu_read_unlock(); | |
332 | return ret; | |
333 | } | |
334 | ||
335 | /* | |
336 | * Read the whole metadata available for a snapshot. | |
337 | * | |
338 | * Returns 0 on success, < 0 on error | |
339 | */ | |
340 | int lttng_kconsumer_snapshot_metadata(uint64_t key, char *path, | |
e2039c7a | 341 | uint64_t relayd_id, struct lttng_consumer_local_data *ctx) |
07b86b52 | 342 | { |
d771f832 DG |
343 | int ret, use_relayd = 0; |
344 | ssize_t ret_read; | |
07b86b52 JD |
345 | struct lttng_consumer_channel *metadata_channel; |
346 | struct lttng_consumer_stream *metadata_stream; | |
d771f832 DG |
347 | |
348 | assert(ctx); | |
07b86b52 JD |
349 | |
350 | DBG("Kernel consumer snapshot metadata with key %" PRIu64 " at path %s", | |
351 | key, path); | |
352 | ||
353 | rcu_read_lock(); | |
354 | ||
355 | metadata_channel = consumer_find_channel(key); | |
356 | if (!metadata_channel) { | |
d771f832 | 357 | ERR("Kernel snapshot metadata not found for key %" PRIu64, key); |
07b86b52 | 358 | ret = -1; |
d771f832 | 359 | goto error; |
07b86b52 JD |
360 | } |
361 | ||
362 | metadata_stream = metadata_channel->metadata_stream; | |
363 | assert(metadata_stream); | |
364 | ||
d771f832 | 365 | /* Flag once that we have a valid relayd for the stream. */ |
e2039c7a | 366 | if (relayd_id != (uint64_t) -1ULL) { |
d771f832 DG |
367 | use_relayd = 1; |
368 | } | |
369 | ||
370 | if (use_relayd) { | |
10a50311 | 371 | ret = consumer_send_relayd_stream(metadata_stream, path); |
e2039c7a | 372 | if (ret < 0) { |
d771f832 | 373 | goto error; |
e2039c7a | 374 | } |
e2039c7a JD |
375 | } else { |
376 | ret = utils_create_stream_file(path, metadata_stream->name, | |
377 | metadata_stream->chan->tracefile_size, | |
378 | metadata_stream->tracefile_count_current, | |
309167d2 | 379 | metadata_stream->uid, metadata_stream->gid, NULL); |
e2039c7a | 380 | if (ret < 0) { |
d771f832 | 381 | goto error; |
e2039c7a JD |
382 | } |
383 | metadata_stream->out_fd = ret; | |
07b86b52 | 384 | } |
07b86b52 | 385 | |
d771f832 | 386 | do { |
9ce5646a MD |
387 | health_code_update(); |
388 | ||
d771f832 DG |
389 | ret_read = lttng_kconsumer_read_subbuffer(metadata_stream, ctx); |
390 | if (ret_read < 0) { | |
56591bac | 391 | if (ret_read != -EAGAIN) { |
6a00837f | 392 | ERR("Kernel snapshot reading metadata subbuffer (ret: %zd)", |
d771f832 DG |
393 | ret_read); |
394 | goto error; | |
07b86b52 | 395 | } |
d771f832 | 396 | /* ret_read is negative at this point so we will exit the loop. */ |
07b86b52 JD |
397 | continue; |
398 | } | |
d771f832 | 399 | } while (ret_read >= 0); |
07b86b52 | 400 | |
d771f832 DG |
401 | if (use_relayd) { |
402 | close_relayd_stream(metadata_stream); | |
403 | metadata_stream->net_seq_idx = (uint64_t) -1ULL; | |
404 | } else { | |
fdf9986c MD |
405 | if (metadata_stream->out_fd >= 0) { |
406 | ret = close(metadata_stream->out_fd); | |
407 | if (ret < 0) { | |
408 | PERROR("Kernel consumer snapshot metadata close out_fd"); | |
409 | /* | |
410 | * Don't go on error here since the snapshot was successful at this | |
411 | * point but somehow the close failed. | |
412 | */ | |
413 | } | |
414 | metadata_stream->out_fd = -1; | |
e2039c7a | 415 | } |
e2039c7a JD |
416 | } |
417 | ||
07b86b52 | 418 | ret = 0; |
d771f832 | 419 | |
cf53a8a6 JD |
420 | cds_list_del(&metadata_stream->send_node); |
421 | consumer_stream_destroy(metadata_stream, NULL); | |
422 | metadata_channel->metadata_stream = NULL; | |
d771f832 | 423 | error: |
07b86b52 JD |
424 | rcu_read_unlock(); |
425 | return ret; | |
426 | } | |
427 | ||
1803a064 MD |
428 | /* |
429 | * Receive command from session daemon and process it. | |
430 | * | |
431 | * Return 1 on success else a negative value or 0. | |
432 | */ | |
3bd1e081 MD |
433 | int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
434 | int sock, struct pollfd *consumer_sockpoll) | |
435 | { | |
436 | ssize_t ret; | |
0c759fc9 | 437 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 MD |
438 | struct lttcomm_consumer_msg msg; |
439 | ||
9ce5646a MD |
440 | health_code_update(); |
441 | ||
3bd1e081 MD |
442 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
443 | if (ret != sizeof(msg)) { | |
1803a064 | 444 | if (ret > 0) { |
c6857fcf | 445 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
1803a064 MD |
446 | ret = -1; |
447 | } | |
3bd1e081 MD |
448 | return ret; |
449 | } | |
9ce5646a MD |
450 | |
451 | health_code_update(); | |
452 | ||
84382d49 MD |
453 | /* Deprecated command */ |
454 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 455 | |
9ce5646a MD |
456 | health_code_update(); |
457 | ||
b0b335c8 MD |
458 | /* relayd needs RCU read-side protection */ |
459 | rcu_read_lock(); | |
460 | ||
3bd1e081 | 461 | switch (msg.cmd_type) { |
00e2e675 DG |
462 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
463 | { | |
f50f23d9 | 464 | /* Session daemon status message are handled in the following call. */ |
7735ef9e DG |
465 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
466 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, | |
d3e2ba59 JD |
467 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
468 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
469 | goto end_nosignal; |
470 | } | |
3bd1e081 MD |
471 | case LTTNG_CONSUMER_ADD_CHANNEL: |
472 | { | |
473 | struct lttng_consumer_channel *new_channel; | |
e43c41c5 | 474 | int ret_recv; |
3bd1e081 | 475 | |
9ce5646a MD |
476 | health_code_update(); |
477 | ||
f50f23d9 DG |
478 | /* First send a status message before receiving the fds. */ |
479 | ret = consumer_send_status_msg(sock, ret_code); | |
480 | if (ret < 0) { | |
481 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 482 | goto error_fatal; |
f50f23d9 | 483 | } |
9ce5646a MD |
484 | |
485 | health_code_update(); | |
486 | ||
d88aee68 | 487 | DBG("consumer_add_channel %" PRIu64, msg.u.channel.channel_key); |
3bd1e081 | 488 | new_channel = consumer_allocate_channel(msg.u.channel.channel_key, |
ffe60014 DG |
489 | msg.u.channel.session_id, msg.u.channel.pathname, |
490 | msg.u.channel.name, msg.u.channel.uid, msg.u.channel.gid, | |
1624d5b7 JD |
491 | msg.u.channel.relayd_id, msg.u.channel.output, |
492 | msg.u.channel.tracefile_size, | |
1950109e | 493 | msg.u.channel.tracefile_count, 0, |
ecc48a90 | 494 | msg.u.channel.monitor, |
d7ba1388 | 495 | msg.u.channel.live_timer_interval, |
3d071855 | 496 | NULL, NULL); |
3bd1e081 | 497 | if (new_channel == NULL) { |
f73fabfd | 498 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
3bd1e081 MD |
499 | goto end_nosignal; |
500 | } | |
ffe60014 | 501 | new_channel->nb_init_stream_left = msg.u.channel.nb_init_streams; |
95a1109b JD |
502 | switch (msg.u.channel.output) { |
503 | case LTTNG_EVENT_SPLICE: | |
504 | new_channel->output = CONSUMER_CHANNEL_SPLICE; | |
505 | break; | |
506 | case LTTNG_EVENT_MMAP: | |
507 | new_channel->output = CONSUMER_CHANNEL_MMAP; | |
508 | break; | |
509 | default: | |
510 | ERR("Channel output unknown %d", msg.u.channel.output); | |
511 | goto end_nosignal; | |
512 | } | |
ffe60014 DG |
513 | |
514 | /* Translate and save channel type. */ | |
515 | switch (msg.u.channel.type) { | |
516 | case CONSUMER_CHANNEL_TYPE_DATA: | |
517 | case CONSUMER_CHANNEL_TYPE_METADATA: | |
518 | new_channel->type = msg.u.channel.type; | |
519 | break; | |
520 | default: | |
521 | assert(0); | |
522 | goto end_nosignal; | |
523 | }; | |
524 | ||
9ce5646a MD |
525 | health_code_update(); |
526 | ||
3bd1e081 | 527 | if (ctx->on_recv_channel != NULL) { |
e43c41c5 JD |
528 | ret_recv = ctx->on_recv_channel(new_channel); |
529 | if (ret_recv == 0) { | |
530 | ret = consumer_add_channel(new_channel, ctx); | |
531 | } else if (ret_recv < 0) { | |
3bd1e081 MD |
532 | goto end_nosignal; |
533 | } | |
534 | } else { | |
e43c41c5 | 535 | ret = consumer_add_channel(new_channel, ctx); |
3bd1e081 | 536 | } |
94d49140 JD |
537 | if (CONSUMER_CHANNEL_TYPE_DATA) { |
538 | consumer_timer_live_start(new_channel, | |
539 | msg.u.channel.live_timer_interval); | |
540 | } | |
e43c41c5 | 541 | |
9ce5646a MD |
542 | health_code_update(); |
543 | ||
e43c41c5 | 544 | /* If we received an error in add_channel, we need to report it. */ |
821fffb2 | 545 | if (ret < 0) { |
1803a064 MD |
546 | ret = consumer_send_status_msg(sock, ret); |
547 | if (ret < 0) { | |
548 | goto error_fatal; | |
549 | } | |
e43c41c5 JD |
550 | goto end_nosignal; |
551 | } | |
552 | ||
3bd1e081 MD |
553 | goto end_nosignal; |
554 | } | |
555 | case LTTNG_CONSUMER_ADD_STREAM: | |
556 | { | |
dae10966 DG |
557 | int fd; |
558 | struct lttng_pipe *stream_pipe; | |
00e2e675 | 559 | struct lttng_consumer_stream *new_stream; |
ffe60014 | 560 | struct lttng_consumer_channel *channel; |
c80048c6 | 561 | int alloc_ret = 0; |
3bd1e081 | 562 | |
ffe60014 DG |
563 | /* |
564 | * Get stream's channel reference. Needed when adding the stream to the | |
565 | * global hash table. | |
566 | */ | |
567 | channel = consumer_find_channel(msg.u.stream.channel_key); | |
568 | if (!channel) { | |
569 | /* | |
570 | * We could not find the channel. Can happen if cpu hotplug | |
571 | * happens while tearing down. | |
572 | */ | |
d88aee68 | 573 | ERR("Unable to find channel key %" PRIu64, msg.u.stream.channel_key); |
e462382a | 574 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
ffe60014 DG |
575 | } |
576 | ||
9ce5646a MD |
577 | health_code_update(); |
578 | ||
f50f23d9 DG |
579 | /* First send a status message before receiving the fds. */ |
580 | ret = consumer_send_status_msg(sock, ret_code); | |
1803a064 | 581 | if (ret < 0) { |
d771f832 | 582 | /* Somehow, the session daemon is not responding anymore. */ |
1803a064 MD |
583 | goto error_fatal; |
584 | } | |
9ce5646a MD |
585 | |
586 | health_code_update(); | |
587 | ||
0c759fc9 | 588 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
d771f832 | 589 | /* Channel was not found. */ |
f50f23d9 DG |
590 | goto end_nosignal; |
591 | } | |
592 | ||
d771f832 | 593 | /* Blocking call */ |
9ce5646a MD |
594 | health_poll_entry(); |
595 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
596 | health_poll_exit(); | |
84382d49 MD |
597 | if (ret) { |
598 | goto error_fatal; | |
3bd1e081 | 599 | } |
00e2e675 | 600 | |
9ce5646a MD |
601 | health_code_update(); |
602 | ||
00e2e675 | 603 | /* Get stream file descriptor from socket */ |
f2fc6720 MD |
604 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); |
605 | if (ret != sizeof(fd)) { | |
f73fabfd | 606 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
3f8e211f | 607 | rcu_read_unlock(); |
3bd1e081 MD |
608 | return ret; |
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. */ | |
621 | goto end_nosignal; | |
622 | } | |
623 | ||
9ce5646a MD |
624 | health_code_update(); |
625 | ||
ffe60014 DG |
626 | new_stream = consumer_allocate_stream(channel->key, |
627 | fd, | |
628 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
629 | channel->name, | |
630 | channel->uid, | |
631 | channel->gid, | |
632 | channel->relayd_id, | |
633 | channel->session_id, | |
634 | msg.u.stream.cpu, | |
635 | &alloc_ret, | |
4891ece8 DG |
636 | channel->type, |
637 | channel->monitor); | |
3bd1e081 | 638 | if (new_stream == NULL) { |
c80048c6 MD |
639 | switch (alloc_ret) { |
640 | case -ENOMEM: | |
641 | case -EINVAL: | |
642 | default: | |
643 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
644 | break; | |
c80048c6 | 645 | } |
3f8e211f | 646 | goto end_nosignal; |
3bd1e081 | 647 | } |
d771f832 | 648 | |
ffe60014 DG |
649 | new_stream->chan = channel; |
650 | new_stream->wait_fd = fd; | |
07b86b52 JD |
651 | switch (channel->output) { |
652 | case CONSUMER_CHANNEL_SPLICE: | |
653 | new_stream->output = LTTNG_EVENT_SPLICE; | |
a2361a61 JD |
654 | ret = utils_create_pipe(new_stream->splice_pipe); |
655 | if (ret < 0) { | |
656 | goto end_nosignal; | |
657 | } | |
07b86b52 JD |
658 | break; |
659 | case CONSUMER_CHANNEL_MMAP: | |
660 | new_stream->output = LTTNG_EVENT_MMAP; | |
661 | break; | |
662 | default: | |
663 | ERR("Stream output unknown %d", channel->output); | |
664 | goto end_nosignal; | |
665 | } | |
00e2e675 | 666 | |
a0c83db9 DG |
667 | /* |
668 | * We've just assigned the channel to the stream so increment the | |
07b86b52 JD |
669 | * refcount right now. We don't need to increment the refcount for |
670 | * streams in no monitor because we handle manually the cleanup of | |
671 | * those. It is very important to make sure there is NO prior | |
672 | * consumer_del_stream() calls or else the refcount will be unbalanced. | |
a0c83db9 | 673 | */ |
07b86b52 JD |
674 | if (channel->monitor) { |
675 | uatomic_inc(&new_stream->chan->refcount); | |
676 | } | |
9d9353f9 | 677 | |
fb3a43a9 DG |
678 | /* |
679 | * The buffer flush is done on the session daemon side for the kernel | |
680 | * so no need for the stream "hangup_flush_done" variable to be | |
681 | * tracked. This is important for a kernel stream since we don't rely | |
682 | * on the flush state of the stream to read data. It's not the case for | |
683 | * user space tracing. | |
684 | */ | |
685 | new_stream->hangup_flush_done = 0; | |
686 | ||
9ce5646a MD |
687 | health_code_update(); |
688 | ||
633d0084 DG |
689 | if (ctx->on_recv_stream) { |
690 | ret = ctx->on_recv_stream(new_stream); | |
691 | if (ret < 0) { | |
d771f832 | 692 | consumer_stream_free(new_stream); |
633d0084 | 693 | goto end_nosignal; |
fb3a43a9 | 694 | } |
633d0084 | 695 | } |
fb3a43a9 | 696 | |
9ce5646a MD |
697 | health_code_update(); |
698 | ||
07b86b52 JD |
699 | if (new_stream->metadata_flag) { |
700 | channel->metadata_stream = new_stream; | |
701 | } | |
702 | ||
2bba9e53 DG |
703 | /* Do not monitor this stream. */ |
704 | if (!channel->monitor) { | |
5eecee74 | 705 | DBG("Kernel consumer add stream %s in no monitor mode with " |
6dc3064a | 706 | "relayd id %" PRIu64, new_stream->name, |
5eecee74 | 707 | new_stream->net_seq_idx); |
10a50311 | 708 | cds_list_add(&new_stream->send_node, &channel->streams.head); |
6dc3064a DG |
709 | break; |
710 | } | |
711 | ||
e1b71bdc DG |
712 | /* Send stream to relayd if the stream has an ID. */ |
713 | if (new_stream->net_seq_idx != (uint64_t) -1ULL) { | |
194ee077 DG |
714 | ret = consumer_send_relayd_stream(new_stream, |
715 | new_stream->chan->pathname); | |
e1b71bdc DG |
716 | if (ret < 0) { |
717 | consumer_stream_free(new_stream); | |
718 | goto end_nosignal; | |
719 | } | |
e2039c7a JD |
720 | } |
721 | ||
50f8ae69 | 722 | /* Get the right pipe where the stream will be sent. */ |
633d0084 | 723 | if (new_stream->metadata_flag) { |
5ab66908 MD |
724 | ret = consumer_add_metadata_stream(new_stream); |
725 | if (ret) { | |
726 | ERR("Consumer add metadata stream %" PRIu64 " failed. Continuing", | |
727 | new_stream->key); | |
728 | consumer_stream_free(new_stream); | |
729 | goto end_nosignal; | |
730 | } | |
dae10966 | 731 | stream_pipe = ctx->consumer_metadata_pipe; |
3bd1e081 | 732 | } else { |
5ab66908 MD |
733 | ret = consumer_add_data_stream(new_stream); |
734 | if (ret) { | |
735 | ERR("Consumer add stream %" PRIu64 " failed. Continuing", | |
736 | new_stream->key); | |
737 | consumer_stream_free(new_stream); | |
738 | goto end_nosignal; | |
739 | } | |
dae10966 | 740 | stream_pipe = ctx->consumer_data_pipe; |
50f8ae69 DG |
741 | } |
742 | ||
5ab66908 MD |
743 | /* Vitible to other threads */ |
744 | new_stream->globally_visible = 1; | |
745 | ||
9ce5646a MD |
746 | health_code_update(); |
747 | ||
dae10966 | 748 | ret = lttng_pipe_write(stream_pipe, &new_stream, sizeof(new_stream)); |
50f8ae69 | 749 | if (ret < 0) { |
dae10966 | 750 | ERR("Consumer write %s stream to pipe %d", |
50f8ae69 | 751 | new_stream->metadata_flag ? "metadata" : "data", |
dae10966 | 752 | lttng_pipe_get_writefd(stream_pipe)); |
5ab66908 MD |
753 | if (new_stream->metadata_flag) { |
754 | consumer_del_stream_for_metadata(new_stream); | |
755 | } else { | |
756 | consumer_del_stream_for_data(new_stream); | |
757 | } | |
50f8ae69 | 758 | goto end_nosignal; |
3bd1e081 | 759 | } |
00e2e675 | 760 | |
50f8ae69 | 761 | DBG("Kernel consumer ADD_STREAM %s (fd: %d) with relayd id %" PRIu64, |
ffe60014 | 762 | new_stream->name, fd, new_stream->relayd_stream_id); |
3bd1e081 MD |
763 | break; |
764 | } | |
a4baae1b JD |
765 | case LTTNG_CONSUMER_STREAMS_SENT: |
766 | { | |
767 | struct lttng_consumer_channel *channel; | |
768 | ||
769 | /* | |
770 | * Get stream's channel reference. Needed when adding the stream to the | |
771 | * global hash table. | |
772 | */ | |
773 | channel = consumer_find_channel(msg.u.sent_streams.channel_key); | |
774 | if (!channel) { | |
775 | /* | |
776 | * We could not find the channel. Can happen if cpu hotplug | |
777 | * happens while tearing down. | |
778 | */ | |
779 | ERR("Unable to find channel key %" PRIu64, | |
780 | msg.u.sent_streams.channel_key); | |
e462382a | 781 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
a4baae1b JD |
782 | } |
783 | ||
784 | health_code_update(); | |
785 | ||
786 | /* | |
787 | * Send status code to session daemon. | |
788 | */ | |
789 | ret = consumer_send_status_msg(sock, ret_code); | |
f261ad0a | 790 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
a4baae1b JD |
791 | /* Somehow, the session daemon is not responding anymore. */ |
792 | goto end_nosignal; | |
793 | } | |
794 | ||
795 | health_code_update(); | |
796 | ||
797 | /* | |
798 | * We should not send this message if we don't monitor the | |
799 | * streams in this channel. | |
800 | */ | |
801 | if (!channel->monitor) { | |
802 | break; | |
803 | } | |
804 | ||
805 | health_code_update(); | |
806 | /* Send stream to relayd if the stream has an ID. */ | |
807 | if (msg.u.sent_streams.net_seq_idx != (uint64_t) -1ULL) { | |
808 | ret = consumer_send_relayd_streams_sent( | |
809 | msg.u.sent_streams.net_seq_idx); | |
810 | if (ret < 0) { | |
811 | goto end_nosignal; | |
812 | } | |
813 | } | |
814 | break; | |
815 | } | |
3bd1e081 MD |
816 | case LTTNG_CONSUMER_UPDATE_STREAM: |
817 | { | |
3f8e211f DG |
818 | rcu_read_unlock(); |
819 | return -ENOSYS; | |
820 | } | |
821 | case LTTNG_CONSUMER_DESTROY_RELAYD: | |
822 | { | |
a6ba4fe1 | 823 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
3f8e211f DG |
824 | struct consumer_relayd_sock_pair *relayd; |
825 | ||
a6ba4fe1 | 826 | DBG("Kernel consumer destroying relayd %" PRIu64, index); |
3f8e211f DG |
827 | |
828 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 829 | relayd = consumer_find_relayd(index); |
3f8e211f | 830 | if (relayd == NULL) { |
3448e266 | 831 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 832 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
3bd1e081 | 833 | } |
3f8e211f | 834 | |
a6ba4fe1 DG |
835 | /* |
836 | * Each relayd socket pair has a refcount of stream attached to it | |
837 | * which tells if the relayd is still active or not depending on the | |
838 | * refcount value. | |
839 | * | |
840 | * This will set the destroy flag of the relayd object and destroy it | |
841 | * if the refcount reaches zero when called. | |
842 | * | |
843 | * The destroy can happen either here or when a stream fd hangs up. | |
844 | */ | |
f50f23d9 DG |
845 | if (relayd) { |
846 | consumer_flag_relayd_for_destroy(relayd); | |
847 | } | |
848 | ||
9ce5646a MD |
849 | health_code_update(); |
850 | ||
f50f23d9 DG |
851 | ret = consumer_send_status_msg(sock, ret_code); |
852 | if (ret < 0) { | |
853 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 854 | goto error_fatal; |
f50f23d9 | 855 | } |
3f8e211f | 856 | |
3f8e211f | 857 | goto end_nosignal; |
3bd1e081 | 858 | } |
6d805429 | 859 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 860 | { |
c8f59ee5 | 861 | int32_t ret; |
6d805429 | 862 | uint64_t id = msg.u.data_pending.session_id; |
c8f59ee5 | 863 | |
6d805429 | 864 | DBG("Kernel consumer data pending command for id %" PRIu64, id); |
c8f59ee5 | 865 | |
6d805429 | 866 | ret = consumer_data_pending(id); |
c8f59ee5 | 867 | |
9ce5646a MD |
868 | health_code_update(); |
869 | ||
c8f59ee5 DG |
870 | /* Send back returned value to session daemon */ |
871 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
872 | if (ret < 0) { | |
6d805429 | 873 | PERROR("send data pending ret code"); |
1803a064 | 874 | goto error_fatal; |
c8f59ee5 | 875 | } |
f50f23d9 DG |
876 | |
877 | /* | |
878 | * No need to send back a status message since the data pending | |
879 | * returned value is the response. | |
880 | */ | |
c8f59ee5 | 881 | break; |
53632229 | 882 | } |
6dc3064a DG |
883 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
884 | { | |
07b86b52 JD |
885 | if (msg.u.snapshot_channel.metadata == 1) { |
886 | ret = lttng_kconsumer_snapshot_metadata(msg.u.snapshot_channel.key, | |
e2039c7a JD |
887 | msg.u.snapshot_channel.pathname, |
888 | msg.u.snapshot_channel.relayd_id, ctx); | |
07b86b52 JD |
889 | if (ret < 0) { |
890 | ERR("Snapshot metadata failed"); | |
e462382a | 891 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; |
07b86b52 JD |
892 | } |
893 | } else { | |
894 | ret = lttng_kconsumer_snapshot_channel(msg.u.snapshot_channel.key, | |
895 | msg.u.snapshot_channel.pathname, | |
5c786ded | 896 | msg.u.snapshot_channel.relayd_id, |
d07ceecd | 897 | msg.u.snapshot_channel.nb_packets_per_stream, |
5c786ded | 898 | ctx); |
07b86b52 JD |
899 | if (ret < 0) { |
900 | ERR("Snapshot channel failed"); | |
e462382a | 901 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
07b86b52 JD |
902 | } |
903 | } | |
904 | ||
9ce5646a MD |
905 | health_code_update(); |
906 | ||
6dc3064a DG |
907 | ret = consumer_send_status_msg(sock, ret_code); |
908 | if (ret < 0) { | |
909 | /* Somehow, the session daemon is not responding anymore. */ | |
910 | goto end_nosignal; | |
911 | } | |
912 | break; | |
913 | } | |
07b86b52 JD |
914 | case LTTNG_CONSUMER_DESTROY_CHANNEL: |
915 | { | |
916 | uint64_t key = msg.u.destroy_channel.key; | |
917 | struct lttng_consumer_channel *channel; | |
918 | ||
919 | channel = consumer_find_channel(key); | |
920 | if (!channel) { | |
921 | ERR("Kernel consumer destroy channel %" PRIu64 " not found", key); | |
e462382a | 922 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
07b86b52 JD |
923 | } |
924 | ||
9ce5646a MD |
925 | health_code_update(); |
926 | ||
07b86b52 JD |
927 | ret = consumer_send_status_msg(sock, ret_code); |
928 | if (ret < 0) { | |
929 | /* Somehow, the session daemon is not responding anymore. */ | |
930 | goto end_nosignal; | |
931 | } | |
932 | ||
9ce5646a MD |
933 | health_code_update(); |
934 | ||
15dc512a DG |
935 | /* Stop right now if no channel was found. */ |
936 | if (!channel) { | |
937 | goto end_nosignal; | |
938 | } | |
939 | ||
07b86b52 JD |
940 | /* |
941 | * This command should ONLY be issued for channel with streams set in | |
942 | * no monitor mode. | |
943 | */ | |
944 | assert(!channel->monitor); | |
945 | ||
946 | /* | |
947 | * The refcount should ALWAYS be 0 in the case of a channel in no | |
948 | * monitor mode. | |
949 | */ | |
950 | assert(!uatomic_sub_return(&channel->refcount, 1)); | |
951 | ||
952 | consumer_del_channel(channel); | |
953 | ||
954 | goto end_nosignal; | |
955 | } | |
fb83fe64 JD |
956 | case LTTNG_CONSUMER_DISCARDED_EVENTS: |
957 | { | |
958 | uint64_t ret; | |
959 | struct lttng_consumer_channel *channel; | |
960 | uint64_t id = msg.u.discarded_events.session_id; | |
961 | uint64_t key = msg.u.discarded_events.channel_key; | |
962 | ||
e5742757 MD |
963 | DBG("Kernel consumer discarded events command for session id %" |
964 | PRIu64 ", channel key %" PRIu64, id, key); | |
965 | ||
fb83fe64 JD |
966 | channel = consumer_find_channel(key); |
967 | if (!channel) { | |
968 | ERR("Kernel consumer discarded events channel %" | |
969 | PRIu64 " not found", key); | |
e5742757 MD |
970 | ret = 0; |
971 | } else { | |
972 | ret = channel->discarded_events; | |
fb83fe64 JD |
973 | } |
974 | ||
fb83fe64 JD |
975 | health_code_update(); |
976 | ||
977 | /* Send back returned value to session daemon */ | |
978 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
979 | if (ret < 0) { | |
980 | PERROR("send discarded events"); | |
981 | goto error_fatal; | |
982 | } | |
983 | ||
984 | break; | |
985 | } | |
986 | case LTTNG_CONSUMER_LOST_PACKETS: | |
987 | { | |
988 | uint64_t ret; | |
989 | struct lttng_consumer_channel *channel; | |
990 | uint64_t id = msg.u.lost_packets.session_id; | |
991 | uint64_t key = msg.u.lost_packets.channel_key; | |
992 | ||
e5742757 MD |
993 | DBG("Kernel consumer lost packets command for session id %" |
994 | PRIu64 ", channel key %" PRIu64, id, key); | |
995 | ||
fb83fe64 JD |
996 | channel = consumer_find_channel(key); |
997 | if (!channel) { | |
998 | ERR("Kernel consumer lost packets channel %" | |
999 | PRIu64 " not found", key); | |
e5742757 MD |
1000 | ret = 0; |
1001 | } else { | |
1002 | ret = channel->lost_packets; | |
fb83fe64 JD |
1003 | } |
1004 | ||
fb83fe64 JD |
1005 | health_code_update(); |
1006 | ||
1007 | /* Send back returned value to session daemon */ | |
1008 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
1009 | if (ret < 0) { | |
1010 | PERROR("send lost packets"); | |
1011 | goto error_fatal; | |
1012 | } | |
1013 | ||
1014 | break; | |
1015 | } | |
b3530820 JG |
1016 | case LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE: |
1017 | { | |
1018 | int channel_monitor_pipe; | |
1019 | ||
1020 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1021 | /* Successfully received the command's type. */ | |
1022 | ret = consumer_send_status_msg(sock, ret_code); | |
1023 | if (ret < 0) { | |
1024 | goto error_fatal; | |
1025 | } | |
1026 | ||
1027 | ret = lttcomm_recv_fds_unix_sock(sock, &channel_monitor_pipe, | |
1028 | 1); | |
1029 | if (ret != sizeof(channel_monitor_pipe)) { | |
1030 | ERR("Failed to receive channel monitor pipe"); | |
1031 | goto error_fatal; | |
1032 | } | |
1033 | ||
1034 | DBG("Received channel monitor pipe (%d)", channel_monitor_pipe); | |
1035 | ret = consumer_timer_thread_set_channel_monitor_pipe( | |
1036 | channel_monitor_pipe); | |
1037 | if (!ret) { | |
1038 | int flags; | |
1039 | ||
1040 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1041 | /* Set the pipe as non-blocking. */ | |
1042 | ret = fcntl(channel_monitor_pipe, F_GETFL, 0); | |
1043 | if (ret == -1) { | |
1044 | PERROR("fcntl get flags of the channel monitoring pipe"); | |
1045 | goto error_fatal; | |
1046 | } | |
1047 | flags = ret; | |
1048 | ||
1049 | ret = fcntl(channel_monitor_pipe, F_SETFL, | |
1050 | flags | O_NONBLOCK); | |
1051 | if (ret == -1) { | |
1052 | PERROR("fcntl set O_NONBLOCK flag of the channel monitoring pipe"); | |
1053 | goto error_fatal; | |
1054 | } | |
1055 | DBG("Channel monitor pipe set as non-blocking"); | |
1056 | } else { | |
1057 | ret_code = LTTCOMM_CONSUMERD_ALREADY_SET; | |
1058 | } | |
1059 | ret = consumer_send_status_msg(sock, ret_code); | |
1060 | if (ret < 0) { | |
1061 | goto error_fatal; | |
1062 | } | |
1063 | break; | |
1064 | } | |
3bd1e081 | 1065 | default: |
3f8e211f | 1066 | goto end_nosignal; |
3bd1e081 | 1067 | } |
3f8e211f | 1068 | |
3bd1e081 | 1069 | end_nosignal: |
b0b335c8 | 1070 | rcu_read_unlock(); |
4cbc1a04 DG |
1071 | |
1072 | /* | |
1073 | * Return 1 to indicate success since the 0 value can be a socket | |
1074 | * shutdown during the recv() or send() call. | |
1075 | */ | |
9ce5646a | 1076 | health_code_update(); |
4cbc1a04 | 1077 | return 1; |
1803a064 MD |
1078 | |
1079 | error_fatal: | |
1080 | rcu_read_unlock(); | |
1081 | /* This will issue a consumer stop. */ | |
1082 | return -1; | |
3bd1e081 | 1083 | } |
d41f73b7 | 1084 | |
309167d2 JD |
1085 | /* |
1086 | * Populate index values of a kernel stream. Values are set in big endian order. | |
1087 | * | |
1088 | * Return 0 on success or else a negative value. | |
1089 | */ | |
50adc264 | 1090 | static int get_index_values(struct ctf_packet_index *index, int infd) |
309167d2 JD |
1091 | { |
1092 | int ret; | |
1093 | ||
1094 | ret = kernctl_get_timestamp_begin(infd, &index->timestamp_begin); | |
1095 | if (ret < 0) { | |
1096 | PERROR("kernctl_get_timestamp_begin"); | |
1097 | goto error; | |
1098 | } | |
1099 | index->timestamp_begin = htobe64(index->timestamp_begin); | |
1100 | ||
1101 | ret = kernctl_get_timestamp_end(infd, &index->timestamp_end); | |
1102 | if (ret < 0) { | |
1103 | PERROR("kernctl_get_timestamp_end"); | |
1104 | goto error; | |
1105 | } | |
1106 | index->timestamp_end = htobe64(index->timestamp_end); | |
1107 | ||
1108 | ret = kernctl_get_events_discarded(infd, &index->events_discarded); | |
1109 | if (ret < 0) { | |
1110 | PERROR("kernctl_get_events_discarded"); | |
1111 | goto error; | |
1112 | } | |
1113 | index->events_discarded = htobe64(index->events_discarded); | |
1114 | ||
1115 | ret = kernctl_get_content_size(infd, &index->content_size); | |
1116 | if (ret < 0) { | |
1117 | PERROR("kernctl_get_content_size"); | |
1118 | goto error; | |
1119 | } | |
1120 | index->content_size = htobe64(index->content_size); | |
1121 | ||
1122 | ret = kernctl_get_packet_size(infd, &index->packet_size); | |
1123 | if (ret < 0) { | |
1124 | PERROR("kernctl_get_packet_size"); | |
1125 | goto error; | |
1126 | } | |
1127 | index->packet_size = htobe64(index->packet_size); | |
1128 | ||
1129 | ret = kernctl_get_stream_id(infd, &index->stream_id); | |
1130 | if (ret < 0) { | |
1131 | PERROR("kernctl_get_stream_id"); | |
1132 | goto error; | |
1133 | } | |
1134 | index->stream_id = htobe64(index->stream_id); | |
1135 | ||
234cd636 JD |
1136 | ret = kernctl_get_instance_id(infd, &index->stream_instance_id); |
1137 | if (ret < 0) { | |
f0b03c22 MD |
1138 | if (ret == -ENOTTY) { |
1139 | /* Command not implemented by lttng-modules. */ | |
1140 | index->stream_instance_id = -1ULL; | |
1141 | ret = 0; | |
1142 | } else { | |
1143 | PERROR("kernctl_get_instance_id"); | |
1144 | goto error; | |
1145 | } | |
234cd636 JD |
1146 | } |
1147 | index->stream_instance_id = htobe64(index->stream_instance_id); | |
1148 | ||
1149 | ret = kernctl_get_sequence_number(infd, &index->packet_seq_num); | |
1150 | if (ret < 0) { | |
f0b03c22 MD |
1151 | if (ret == -ENOTTY) { |
1152 | /* Command not implemented by lttng-modules. */ | |
1153 | index->packet_seq_num = -1ULL; | |
1154 | ret = 0; | |
1155 | } else { | |
1156 | PERROR("kernctl_get_sequence_number"); | |
1157 | goto error; | |
1158 | } | |
234cd636 JD |
1159 | } |
1160 | index->packet_seq_num = htobe64(index->packet_seq_num); | |
1161 | ||
309167d2 JD |
1162 | error: |
1163 | return ret; | |
1164 | } | |
94d49140 JD |
1165 | /* |
1166 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
1167 | * metadata thread can consumer them. | |
1168 | * | |
1169 | * Metadata stream lock MUST be acquired. | |
1170 | * | |
1171 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream | |
1172 | * is empty or a negative value on error. | |
1173 | */ | |
1174 | int lttng_kconsumer_sync_metadata(struct lttng_consumer_stream *metadata) | |
1175 | { | |
1176 | int ret; | |
1177 | ||
1178 | assert(metadata); | |
1179 | ||
1180 | ret = kernctl_buffer_flush(metadata->wait_fd); | |
1181 | if (ret < 0) { | |
1182 | ERR("Failed to flush kernel stream"); | |
1183 | goto end; | |
1184 | } | |
1185 | ||
1186 | ret = kernctl_snapshot(metadata->wait_fd); | |
1187 | if (ret < 0) { | |
32af2c95 | 1188 | if (ret != -EAGAIN) { |
94d49140 JD |
1189 | ERR("Sync metadata, taking kernel snapshot failed."); |
1190 | goto end; | |
1191 | } | |
1192 | DBG("Sync metadata, no new kernel metadata"); | |
1193 | /* No new metadata, exit. */ | |
1194 | ret = ENODATA; | |
1195 | goto end; | |
1196 | } | |
1197 | ||
1198 | end: | |
1199 | return ret; | |
1200 | } | |
309167d2 | 1201 | |
fb83fe64 JD |
1202 | static |
1203 | int update_stream_stats(struct lttng_consumer_stream *stream) | |
1204 | { | |
1205 | int ret; | |
1206 | uint64_t seq, discarded; | |
1207 | ||
1208 | ret = kernctl_get_sequence_number(stream->wait_fd, &seq); | |
1209 | if (ret < 0) { | |
f0b03c22 MD |
1210 | if (ret == -ENOTTY) { |
1211 | /* Command not implemented by lttng-modules. */ | |
1212 | seq = -1ULL; | |
1213 | ret = 0; | |
1214 | } else { | |
1215 | PERROR("kernctl_get_sequence_number"); | |
1216 | goto end; | |
1217 | } | |
fb83fe64 JD |
1218 | } |
1219 | ||
1220 | /* | |
1221 | * Start the sequence when we extract the first packet in case we don't | |
1222 | * start at 0 (for example if a consumer is not connected to the | |
1223 | * session immediately after the beginning). | |
1224 | */ | |
1225 | if (stream->last_sequence_number == -1ULL) { | |
1226 | stream->last_sequence_number = seq; | |
1227 | } else if (seq > stream->last_sequence_number) { | |
1228 | stream->chan->lost_packets += seq - | |
1229 | stream->last_sequence_number - 1; | |
1230 | } else { | |
1231 | /* seq <= last_sequence_number */ | |
1232 | ERR("Sequence number inconsistent : prev = %" PRIu64 | |
1233 | ", current = %" PRIu64, | |
1234 | stream->last_sequence_number, seq); | |
1235 | ret = -1; | |
1236 | goto end; | |
1237 | } | |
1238 | stream->last_sequence_number = seq; | |
1239 | ||
1240 | ret = kernctl_get_events_discarded(stream->wait_fd, &discarded); | |
1241 | if (ret < 0) { | |
1242 | PERROR("kernctl_get_events_discarded"); | |
1243 | goto end; | |
1244 | } | |
1245 | if (discarded < stream->last_discarded_events) { | |
1246 | /* | |
83f4233d MJ |
1247 | * Overflow has occurred. We assume only one wrap-around |
1248 | * has occurred. | |
fb83fe64 JD |
1249 | */ |
1250 | stream->chan->discarded_events += (1ULL << (CAA_BITS_PER_LONG - 1)) - | |
1251 | stream->last_discarded_events + discarded; | |
1252 | } else { | |
1253 | stream->chan->discarded_events += discarded - | |
1254 | stream->last_discarded_events; | |
1255 | } | |
1256 | stream->last_discarded_events = discarded; | |
1257 | ret = 0; | |
1258 | ||
1259 | end: | |
1260 | return ret; | |
1261 | } | |
1262 | ||
93ec662e JD |
1263 | /* |
1264 | * Check if the local version of the metadata stream matches with the version | |
1265 | * of the metadata stream in the kernel. If it was updated, set the reset flag | |
1266 | * on the stream. | |
1267 | */ | |
1268 | static | |
1269 | int metadata_stream_check_version(int infd, struct lttng_consumer_stream *stream) | |
1270 | { | |
1271 | int ret; | |
1272 | uint64_t cur_version; | |
1273 | ||
1274 | ret = kernctl_get_metadata_version(infd, &cur_version); | |
1275 | if (ret < 0) { | |
f0b03c22 MD |
1276 | if (ret == -ENOTTY) { |
1277 | /* | |
1278 | * LTTng-modules does not implement this | |
1279 | * command. | |
1280 | */ | |
1281 | ret = 0; | |
1282 | goto end; | |
1283 | } | |
93ec662e JD |
1284 | ERR("Failed to get the metadata version"); |
1285 | goto end; | |
1286 | } | |
1287 | ||
1288 | if (stream->metadata_version == cur_version) { | |
1289 | ret = 0; | |
1290 | goto end; | |
1291 | } | |
1292 | ||
1293 | DBG("New metadata version detected"); | |
1294 | stream->metadata_version = cur_version; | |
1295 | stream->reset_metadata_flag = 1; | |
1296 | ret = 0; | |
1297 | ||
1298 | end: | |
1299 | return ret; | |
1300 | } | |
1301 | ||
d41f73b7 MD |
1302 | /* |
1303 | * Consume data on a file descriptor and write it on a trace file. | |
1304 | */ | |
4078b776 | 1305 | ssize_t lttng_kconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
1306 | struct lttng_consumer_local_data *ctx) |
1307 | { | |
1d4dfdef | 1308 | unsigned long len, subbuf_size, padding; |
1c20f0e2 | 1309 | int err, write_index = 1; |
4078b776 | 1310 | ssize_t ret = 0; |
d41f73b7 | 1311 | int infd = stream->wait_fd; |
50adc264 | 1312 | struct ctf_packet_index index; |
d41f73b7 MD |
1313 | |
1314 | DBG("In read_subbuffer (infd : %d)", infd); | |
309167d2 | 1315 | |
d41f73b7 MD |
1316 | /* Get the next subbuffer */ |
1317 | err = kernctl_get_next_subbuf(infd); | |
1318 | if (err != 0) { | |
d41f73b7 MD |
1319 | /* |
1320 | * This is a debug message even for single-threaded consumer, | |
1321 | * because poll() have more relaxed criterions than get subbuf, | |
1322 | * so get_subbuf may fail for short race windows where poll() | |
1323 | * would issue wakeups. | |
1324 | */ | |
1325 | DBG("Reserving sub buffer failed (everything is normal, " | |
1326 | "it is due to concurrency)"); | |
32af2c95 | 1327 | ret = err; |
d41f73b7 MD |
1328 | goto end; |
1329 | } | |
1330 | ||
1d4dfdef DG |
1331 | /* Get the full subbuffer size including padding */ |
1332 | err = kernctl_get_padded_subbuf_size(infd, &len); | |
1333 | if (err != 0) { | |
5a510c9f | 1334 | PERROR("Getting sub-buffer len failed."); |
8265f19e MD |
1335 | err = kernctl_put_subbuf(infd); |
1336 | if (err != 0) { | |
32af2c95 | 1337 | if (err == -EFAULT) { |
5a510c9f | 1338 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1339 | } else if (err == -EIO) { |
8265f19e | 1340 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1341 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e | 1342 | } |
32af2c95 | 1343 | ret = err; |
8265f19e MD |
1344 | goto end; |
1345 | } | |
32af2c95 | 1346 | ret = err; |
1d4dfdef DG |
1347 | goto end; |
1348 | } | |
1349 | ||
1c20f0e2 | 1350 | if (!stream->metadata_flag) { |
309167d2 JD |
1351 | ret = get_index_values(&index, infd); |
1352 | if (ret < 0) { | |
8265f19e MD |
1353 | err = kernctl_put_subbuf(infd); |
1354 | if (err != 0) { | |
32af2c95 | 1355 | if (err == -EFAULT) { |
5a510c9f | 1356 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1357 | } else if (err == -EIO) { |
8265f19e | 1358 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1359 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e | 1360 | } |
32af2c95 | 1361 | ret = err; |
8265f19e MD |
1362 | goto end; |
1363 | } | |
309167d2 JD |
1364 | goto end; |
1365 | } | |
fb83fe64 JD |
1366 | ret = update_stream_stats(stream); |
1367 | if (ret < 0) { | |
7b87473d MD |
1368 | err = kernctl_put_subbuf(infd); |
1369 | if (err != 0) { | |
1370 | if (err == -EFAULT) { | |
1371 | PERROR("Error in unreserving sub buffer\n"); | |
1372 | } else if (err == -EIO) { | |
1373 | /* Should never happen with newer LTTng versions */ | |
1374 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
1375 | } | |
1376 | ret = err; | |
1377 | goto end; | |
1378 | } | |
fb83fe64 JD |
1379 | goto end; |
1380 | } | |
1c20f0e2 JD |
1381 | } else { |
1382 | write_index = 0; | |
93ec662e JD |
1383 | ret = metadata_stream_check_version(infd, stream); |
1384 | if (ret < 0) { | |
7b87473d MD |
1385 | err = kernctl_put_subbuf(infd); |
1386 | if (err != 0) { | |
1387 | if (err == -EFAULT) { | |
1388 | PERROR("Error in unreserving sub buffer\n"); | |
1389 | } else if (err == -EIO) { | |
1390 | /* Should never happen with newer LTTng versions */ | |
1391 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
1392 | } | |
1393 | ret = err; | |
1394 | goto end; | |
1395 | } | |
93ec662e JD |
1396 | goto end; |
1397 | } | |
309167d2 JD |
1398 | } |
1399 | ||
ffe60014 | 1400 | switch (stream->chan->output) { |
07b86b52 | 1401 | case CONSUMER_CHANNEL_SPLICE: |
1d4dfdef DG |
1402 | /* |
1403 | * XXX: The lttng-modules splice "actor" does not handle copying | |
1404 | * partial pages hence only using the subbuffer size without the | |
1405 | * padding makes the splice fail. | |
1406 | */ | |
1407 | subbuf_size = len; | |
1408 | padding = 0; | |
1409 | ||
1410 | /* splice the subbuffer to the tracefile */ | |
91dfef6e | 1411 | ret = lttng_consumer_on_read_subbuffer_splice(ctx, stream, subbuf_size, |
309167d2 | 1412 | padding, &index); |
91dfef6e DG |
1413 | /* |
1414 | * XXX: Splice does not support network streaming so the return value | |
1415 | * is simply checked against subbuf_size and not like the mmap() op. | |
1416 | */ | |
1d4dfdef DG |
1417 | if (ret != subbuf_size) { |
1418 | /* | |
1419 | * display the error but continue processing to try | |
1420 | * to release the subbuffer | |
1421 | */ | |
1422 | ERR("Error splicing to tracefile (ret: %zd != len: %lu)", | |
1423 | ret, subbuf_size); | |
309167d2 | 1424 | write_index = 0; |
1d4dfdef DG |
1425 | } |
1426 | break; | |
07b86b52 | 1427 | case CONSUMER_CHANNEL_MMAP: |
1d4dfdef DG |
1428 | /* Get subbuffer size without padding */ |
1429 | err = kernctl_get_subbuf_size(infd, &subbuf_size); | |
1430 | if (err != 0) { | |
5a510c9f | 1431 | PERROR("Getting sub-buffer len failed."); |
8265f19e MD |
1432 | err = kernctl_put_subbuf(infd); |
1433 | if (err != 0) { | |
32af2c95 | 1434 | if (err == -EFAULT) { |
5a510c9f | 1435 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1436 | } else if (err == -EIO) { |
8265f19e | 1437 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1438 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
8265f19e | 1439 | } |
32af2c95 | 1440 | ret = err; |
8265f19e MD |
1441 | goto end; |
1442 | } | |
32af2c95 | 1443 | ret = err; |
1d4dfdef DG |
1444 | goto end; |
1445 | } | |
47e81c02 | 1446 | |
1d4dfdef DG |
1447 | /* Make sure the tracer is not gone mad on us! */ |
1448 | assert(len >= subbuf_size); | |
1449 | ||
1450 | padding = len - subbuf_size; | |
1451 | ||
1452 | /* write the subbuffer to the tracefile */ | |
91dfef6e | 1453 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, |
309167d2 | 1454 | padding, &index); |
91dfef6e DG |
1455 | /* |
1456 | * The mmap operation should write subbuf_size amount of data when | |
1457 | * network streaming or the full padding (len) size when we are _not_ | |
1458 | * streaming. | |
1459 | */ | |
d88aee68 DG |
1460 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
1461 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
1d4dfdef | 1462 | /* |
91dfef6e | 1463 | * Display the error but continue processing to try to release the |
2336629e DG |
1464 | * subbuffer. This is a DBG statement since this is possible to |
1465 | * happen without being a critical error. | |
1d4dfdef | 1466 | */ |
2336629e | 1467 | DBG("Error writing to tracefile " |
91dfef6e DG |
1468 | "(ret: %zd != len: %lu != subbuf_size: %lu)", |
1469 | ret, len, subbuf_size); | |
309167d2 | 1470 | write_index = 0; |
1d4dfdef DG |
1471 | } |
1472 | break; | |
1473 | default: | |
1474 | ERR("Unknown output method"); | |
56591bac | 1475 | ret = -EPERM; |
d41f73b7 MD |
1476 | } |
1477 | ||
1478 | err = kernctl_put_next_subbuf(infd); | |
1479 | if (err != 0) { | |
32af2c95 | 1480 | if (err == -EFAULT) { |
5a510c9f | 1481 | PERROR("Error in unreserving sub buffer\n"); |
32af2c95 | 1482 | } else if (err == -EIO) { |
d41f73b7 | 1483 | /* Should never happen with newer LTTng versions */ |
5a510c9f | 1484 | PERROR("Reader has been pushed by the writer, last sub-buffer corrupted."); |
d41f73b7 | 1485 | } |
32af2c95 | 1486 | ret = err; |
d41f73b7 MD |
1487 | goto end; |
1488 | } | |
1489 | ||
309167d2 | 1490 | /* Write index if needed. */ |
1c20f0e2 JD |
1491 | if (!write_index) { |
1492 | goto end; | |
1493 | } | |
1494 | ||
94d49140 JD |
1495 | if (stream->chan->live_timer_interval && !stream->metadata_flag) { |
1496 | /* | |
1497 | * In live, block until all the metadata is sent. | |
1498 | */ | |
c585821b MD |
1499 | pthread_mutex_lock(&stream->metadata_timer_lock); |
1500 | assert(!stream->missed_metadata_flush); | |
1501 | stream->waiting_on_metadata = true; | |
1502 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1503 | ||
94d49140 | 1504 | err = consumer_stream_sync_metadata(ctx, stream->session_id); |
c585821b MD |
1505 | |
1506 | pthread_mutex_lock(&stream->metadata_timer_lock); | |
1507 | stream->waiting_on_metadata = false; | |
1508 | if (stream->missed_metadata_flush) { | |
1509 | stream->missed_metadata_flush = false; | |
1510 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1511 | (void) consumer_flush_kernel_index(stream); | |
1512 | } else { | |
1513 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
1514 | } | |
94d49140 JD |
1515 | if (err < 0) { |
1516 | goto end; | |
1517 | } | |
1518 | } | |
1519 | ||
1c20f0e2 JD |
1520 | err = consumer_stream_write_index(stream, &index); |
1521 | if (err < 0) { | |
1522 | goto end; | |
309167d2 JD |
1523 | } |
1524 | ||
d41f73b7 MD |
1525 | end: |
1526 | return ret; | |
1527 | } | |
1528 | ||
1529 | int lttng_kconsumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
1530 | { | |
1531 | int ret; | |
ffe60014 DG |
1532 | |
1533 | assert(stream); | |
1534 | ||
2bba9e53 DG |
1535 | /* |
1536 | * Don't create anything if this is set for streaming or should not be | |
1537 | * monitored. | |
1538 | */ | |
1539 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { | |
fe4477ee JD |
1540 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
1541 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
309167d2 | 1542 | stream->uid, stream->gid, NULL); |
fe4477ee JD |
1543 | if (ret < 0) { |
1544 | goto error; | |
1545 | } | |
1546 | stream->out_fd = ret; | |
1547 | stream->tracefile_size_current = 0; | |
309167d2 JD |
1548 | |
1549 | if (!stream->metadata_flag) { | |
f8f3885c MD |
1550 | struct lttng_index_file *index_file; |
1551 | ||
1552 | index_file = lttng_index_file_create(stream->chan->pathname, | |
309167d2 JD |
1553 | stream->name, stream->uid, stream->gid, |
1554 | stream->chan->tracefile_size, | |
f8f3885c MD |
1555 | stream->tracefile_count_current, |
1556 | CTF_INDEX_MAJOR, CTF_INDEX_MINOR); | |
1557 | if (!index_file) { | |
309167d2 JD |
1558 | goto error; |
1559 | } | |
1b47ae58 | 1560 | assert(!stream->index_file); |
f8f3885c | 1561 | stream->index_file = index_file; |
309167d2 | 1562 | } |
ffe60014 | 1563 | } |
d41f73b7 | 1564 | |
d41f73b7 MD |
1565 | if (stream->output == LTTNG_EVENT_MMAP) { |
1566 | /* get the len of the mmap region */ | |
1567 | unsigned long mmap_len; | |
1568 | ||
1569 | ret = kernctl_get_mmap_len(stream->wait_fd, &mmap_len); | |
1570 | if (ret != 0) { | |
ffe60014 | 1571 | PERROR("kernctl_get_mmap_len"); |
d41f73b7 MD |
1572 | goto error_close_fd; |
1573 | } | |
1574 | stream->mmap_len = (size_t) mmap_len; | |
1575 | ||
ffe60014 DG |
1576 | stream->mmap_base = mmap(NULL, stream->mmap_len, PROT_READ, |
1577 | MAP_PRIVATE, stream->wait_fd, 0); | |
d41f73b7 | 1578 | if (stream->mmap_base == MAP_FAILED) { |
ffe60014 | 1579 | PERROR("Error mmaping"); |
d41f73b7 MD |
1580 | ret = -1; |
1581 | goto error_close_fd; | |
1582 | } | |
1583 | } | |
1584 | ||
1585 | /* we return 0 to let the library handle the FD internally */ | |
1586 | return 0; | |
1587 | ||
1588 | error_close_fd: | |
2f225ce2 | 1589 | if (stream->out_fd >= 0) { |
d41f73b7 MD |
1590 | int err; |
1591 | ||
1592 | err = close(stream->out_fd); | |
1593 | assert(!err); | |
2f225ce2 | 1594 | stream->out_fd = -1; |
d41f73b7 MD |
1595 | } |
1596 | error: | |
1597 | return ret; | |
1598 | } | |
1599 | ||
ca22feea DG |
1600 | /* |
1601 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
1602 | * stream. Consumer data lock MUST be acquired before calling this function |
1603 | * and the stream lock. | |
ca22feea | 1604 | * |
6d805429 | 1605 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
1606 | * data is available for trace viewer reading. |
1607 | */ | |
6d805429 | 1608 | int lttng_kconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
1609 | { |
1610 | int ret; | |
1611 | ||
1612 | assert(stream); | |
1613 | ||
873b9e9a MD |
1614 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
1615 | ret = 0; | |
1616 | goto end; | |
1617 | } | |
1618 | ||
ca22feea DG |
1619 | ret = kernctl_get_next_subbuf(stream->wait_fd); |
1620 | if (ret == 0) { | |
1621 | /* There is still data so let's put back this subbuffer. */ | |
1622 | ret = kernctl_put_subbuf(stream->wait_fd); | |
1623 | assert(ret == 0); | |
6d805429 | 1624 | ret = 1; /* Data is pending */ |
4e9a4686 | 1625 | goto end; |
ca22feea DG |
1626 | } |
1627 | ||
6d805429 DG |
1628 | /* Data is NOT pending and ready to be read. */ |
1629 | ret = 0; | |
ca22feea | 1630 | |
6efae65e DG |
1631 | end: |
1632 | return ret; | |
ca22feea | 1633 | } |