Commit | Line | Data |
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3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * | |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
3bd1e081 MD |
8 | * |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
3bd1e081 MD |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <assert.h> | |
3bd1e081 MD |
21 | #include <poll.h> |
22 | #include <pthread.h> | |
23 | #include <stdlib.h> | |
24 | #include <string.h> | |
25 | #include <sys/mman.h> | |
26 | #include <sys/socket.h> | |
27 | #include <sys/types.h> | |
77c7c900 | 28 | #include <inttypes.h> |
3bd1e081 | 29 | #include <unistd.h> |
dbb5dfe6 | 30 | #include <sys/stat.h> |
3bd1e081 | 31 | |
990570ed | 32 | #include <common/common.h> |
10a8a223 | 33 | #include <common/kernel-ctl/kernel-ctl.h> |
10a8a223 | 34 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 35 | #include <common/sessiond-comm/relayd.h> |
dbb5dfe6 | 36 | #include <common/compat/fcntl.h> |
acdb9057 | 37 | #include <common/pipe.h> |
00e2e675 | 38 | #include <common/relayd/relayd.h> |
fe4477ee | 39 | #include <common/utils.h> |
0857097f | 40 | |
10a8a223 | 41 | #include "kernel-consumer.h" |
3bd1e081 MD |
42 | |
43 | extern struct lttng_consumer_global_data consumer_data; | |
44 | extern int consumer_poll_timeout; | |
45 | extern volatile int consumer_quit; | |
46 | ||
3bd1e081 MD |
47 | /* |
48 | * Take a snapshot for a specific fd | |
49 | * | |
50 | * Returns 0 on success, < 0 on error | |
51 | */ | |
ffe60014 | 52 | int lttng_kconsumer_take_snapshot(struct lttng_consumer_stream *stream) |
3bd1e081 MD |
53 | { |
54 | int ret = 0; | |
55 | int infd = stream->wait_fd; | |
56 | ||
57 | ret = kernctl_snapshot(infd); | |
58 | if (ret != 0) { | |
87dc6a9c | 59 | errno = -ret; |
3bd1e081 MD |
60 | perror("Getting sub-buffer snapshot."); |
61 | } | |
62 | ||
63 | return ret; | |
64 | } | |
65 | ||
66 | /* | |
67 | * Get the produced position | |
68 | * | |
69 | * Returns 0 on success, < 0 on error | |
70 | */ | |
ffe60014 | 71 | int lttng_kconsumer_get_produced_snapshot(struct lttng_consumer_stream *stream, |
3bd1e081 MD |
72 | unsigned long *pos) |
73 | { | |
74 | int ret; | |
75 | int infd = stream->wait_fd; | |
76 | ||
77 | ret = kernctl_snapshot_get_produced(infd, pos); | |
78 | if (ret != 0) { | |
87dc6a9c | 79 | errno = -ret; |
3bd1e081 MD |
80 | perror("kernctl_snapshot_get_produced"); |
81 | } | |
82 | ||
83 | return ret; | |
84 | } | |
85 | ||
1803a064 MD |
86 | /* |
87 | * Receive command from session daemon and process it. | |
88 | * | |
89 | * Return 1 on success else a negative value or 0. | |
90 | */ | |
3bd1e081 MD |
91 | int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
92 | int sock, struct pollfd *consumer_sockpoll) | |
93 | { | |
94 | ssize_t ret; | |
f50f23d9 | 95 | enum lttng_error_code ret_code = LTTNG_OK; |
3bd1e081 MD |
96 | struct lttcomm_consumer_msg msg; |
97 | ||
98 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); | |
99 | if (ret != sizeof(msg)) { | |
f73fabfd | 100 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
1803a064 MD |
101 | if (ret > 0) { |
102 | ret = -1; | |
103 | } | |
3bd1e081 MD |
104 | return ret; |
105 | } | |
106 | if (msg.cmd_type == LTTNG_CONSUMER_STOP) { | |
f50f23d9 DG |
107 | /* |
108 | * Notify the session daemon that the command is completed. | |
109 | * | |
110 | * On transport layer error, the function call will print an error | |
111 | * message so handling the returned code is a bit useless since we | |
112 | * return an error code anyway. | |
113 | */ | |
114 | (void) consumer_send_status_msg(sock, ret_code); | |
3bd1e081 MD |
115 | return -ENOENT; |
116 | } | |
117 | ||
b0b335c8 MD |
118 | /* relayd needs RCU read-side protection */ |
119 | rcu_read_lock(); | |
120 | ||
3bd1e081 | 121 | switch (msg.cmd_type) { |
00e2e675 DG |
122 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
123 | { | |
f50f23d9 | 124 | /* Session daemon status message are handled in the following call. */ |
7735ef9e DG |
125 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
126 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, | |
46e6455f | 127 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id); |
00e2e675 DG |
128 | goto end_nosignal; |
129 | } | |
3bd1e081 MD |
130 | case LTTNG_CONSUMER_ADD_CHANNEL: |
131 | { | |
132 | struct lttng_consumer_channel *new_channel; | |
e43c41c5 | 133 | int ret_recv; |
3bd1e081 | 134 | |
f50f23d9 DG |
135 | /* First send a status message before receiving the fds. */ |
136 | ret = consumer_send_status_msg(sock, ret_code); | |
137 | if (ret < 0) { | |
138 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 139 | goto error_fatal; |
f50f23d9 | 140 | } |
d88aee68 | 141 | DBG("consumer_add_channel %" PRIu64, msg.u.channel.channel_key); |
3bd1e081 | 142 | new_channel = consumer_allocate_channel(msg.u.channel.channel_key, |
ffe60014 DG |
143 | msg.u.channel.session_id, msg.u.channel.pathname, |
144 | msg.u.channel.name, msg.u.channel.uid, msg.u.channel.gid, | |
1624d5b7 JD |
145 | msg.u.channel.relayd_id, msg.u.channel.output, |
146 | msg.u.channel.tracefile_size, | |
147 | msg.u.channel.tracefile_count); | |
3bd1e081 | 148 | if (new_channel == NULL) { |
f73fabfd | 149 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
3bd1e081 MD |
150 | goto end_nosignal; |
151 | } | |
ffe60014 DG |
152 | new_channel->nb_init_stream_left = msg.u.channel.nb_init_streams; |
153 | ||
154 | /* Translate and save channel type. */ | |
155 | switch (msg.u.channel.type) { | |
156 | case CONSUMER_CHANNEL_TYPE_DATA: | |
157 | case CONSUMER_CHANNEL_TYPE_METADATA: | |
158 | new_channel->type = msg.u.channel.type; | |
159 | break; | |
160 | default: | |
161 | assert(0); | |
162 | goto end_nosignal; | |
163 | }; | |
164 | ||
3bd1e081 | 165 | if (ctx->on_recv_channel != NULL) { |
e43c41c5 JD |
166 | ret_recv = ctx->on_recv_channel(new_channel); |
167 | if (ret_recv == 0) { | |
168 | ret = consumer_add_channel(new_channel, ctx); | |
169 | } else if (ret_recv < 0) { | |
3bd1e081 MD |
170 | goto end_nosignal; |
171 | } | |
172 | } else { | |
e43c41c5 | 173 | ret = consumer_add_channel(new_channel, ctx); |
3bd1e081 | 174 | } |
e43c41c5 JD |
175 | |
176 | /* If we received an error in add_channel, we need to report it. */ | |
821fffb2 | 177 | if (ret < 0) { |
1803a064 MD |
178 | ret = consumer_send_status_msg(sock, ret); |
179 | if (ret < 0) { | |
180 | goto error_fatal; | |
181 | } | |
e43c41c5 JD |
182 | goto end_nosignal; |
183 | } | |
184 | ||
3bd1e081 MD |
185 | goto end_nosignal; |
186 | } | |
187 | case LTTNG_CONSUMER_ADD_STREAM: | |
188 | { | |
dae10966 DG |
189 | int fd; |
190 | struct lttng_pipe *stream_pipe; | |
00e2e675 DG |
191 | struct consumer_relayd_sock_pair *relayd = NULL; |
192 | struct lttng_consumer_stream *new_stream; | |
ffe60014 | 193 | struct lttng_consumer_channel *channel; |
c80048c6 | 194 | int alloc_ret = 0; |
3bd1e081 | 195 | |
ffe60014 DG |
196 | /* |
197 | * Get stream's channel reference. Needed when adding the stream to the | |
198 | * global hash table. | |
199 | */ | |
200 | channel = consumer_find_channel(msg.u.stream.channel_key); | |
201 | if (!channel) { | |
202 | /* | |
203 | * We could not find the channel. Can happen if cpu hotplug | |
204 | * happens while tearing down. | |
205 | */ | |
d88aee68 | 206 | ERR("Unable to find channel key %" PRIu64, msg.u.stream.channel_key); |
ffe60014 DG |
207 | ret_code = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
208 | } | |
209 | ||
f50f23d9 DG |
210 | /* First send a status message before receiving the fds. */ |
211 | ret = consumer_send_status_msg(sock, ret_code); | |
1803a064 MD |
212 | if (ret < 0) { |
213 | /* | |
214 | * Somehow, the session daemon is not responding | |
215 | * anymore. | |
216 | */ | |
217 | goto error_fatal; | |
218 | } | |
219 | if (ret_code != LTTNG_OK) { | |
ffe60014 | 220 | /* |
1803a064 | 221 | * Channel was not found. |
ffe60014 | 222 | */ |
f50f23d9 DG |
223 | goto end_nosignal; |
224 | } | |
225 | ||
3bd1e081 MD |
226 | /* block */ |
227 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
3f8e211f | 228 | rcu_read_unlock(); |
3bd1e081 MD |
229 | return -EINTR; |
230 | } | |
00e2e675 DG |
231 | |
232 | /* Get stream file descriptor from socket */ | |
f2fc6720 MD |
233 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); |
234 | if (ret != sizeof(fd)) { | |
f73fabfd | 235 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
3f8e211f | 236 | rcu_read_unlock(); |
3bd1e081 MD |
237 | return ret; |
238 | } | |
3bd1e081 | 239 | |
f50f23d9 DG |
240 | /* |
241 | * Send status code to session daemon only if the recv works. If the | |
242 | * above recv() failed, the session daemon is notified through the | |
243 | * error socket and the teardown is eventually done. | |
244 | */ | |
245 | ret = consumer_send_status_msg(sock, ret_code); | |
246 | if (ret < 0) { | |
247 | /* Somehow, the session daemon is not responding anymore. */ | |
248 | goto end_nosignal; | |
249 | } | |
250 | ||
ffe60014 DG |
251 | new_stream = consumer_allocate_stream(channel->key, |
252 | fd, | |
253 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
254 | channel->name, | |
255 | channel->uid, | |
256 | channel->gid, | |
257 | channel->relayd_id, | |
258 | channel->session_id, | |
259 | msg.u.stream.cpu, | |
260 | &alloc_ret, | |
261 | channel->type); | |
3bd1e081 | 262 | if (new_stream == NULL) { |
c80048c6 MD |
263 | switch (alloc_ret) { |
264 | case -ENOMEM: | |
265 | case -EINVAL: | |
266 | default: | |
267 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
268 | break; | |
c80048c6 | 269 | } |
3f8e211f | 270 | goto end_nosignal; |
3bd1e081 | 271 | } |
ffe60014 DG |
272 | new_stream->chan = channel; |
273 | new_stream->wait_fd = fd; | |
00e2e675 | 274 | |
a0c83db9 DG |
275 | /* |
276 | * We've just assigned the channel to the stream so increment the | |
277 | * refcount right now. | |
278 | */ | |
279 | uatomic_inc(&new_stream->chan->refcount); | |
9d9353f9 | 280 | |
fb3a43a9 DG |
281 | /* |
282 | * The buffer flush is done on the session daemon side for the kernel | |
283 | * so no need for the stream "hangup_flush_done" variable to be | |
284 | * tracked. This is important for a kernel stream since we don't rely | |
285 | * on the flush state of the stream to read data. It's not the case for | |
286 | * user space tracing. | |
287 | */ | |
288 | new_stream->hangup_flush_done = 0; | |
289 | ||
00e2e675 | 290 | /* The stream is not metadata. Get relayd reference if exists. */ |
ffe60014 | 291 | relayd = consumer_find_relayd(new_stream->net_seq_idx); |
00e2e675 DG |
292 | if (relayd != NULL) { |
293 | /* Add stream on the relayd */ | |
294 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
295 | ret = relayd_add_stream(&relayd->control_sock, | |
ffe60014 | 296 | new_stream->name, new_stream->chan->pathname, |
0f907de1 JD |
297 | &new_stream->relayd_stream_id, |
298 | new_stream->chan->tracefile_size, | |
299 | new_stream->chan->tracefile_count); | |
00e2e675 DG |
300 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); |
301 | if (ret < 0) { | |
e316aad5 | 302 | consumer_del_stream(new_stream, NULL); |
3f8e211f | 303 | goto end_nosignal; |
00e2e675 | 304 | } |
d88aee68 DG |
305 | } else if (new_stream->net_seq_idx != (uint64_t) -1ULL) { |
306 | ERR("Network sequence index %" PRIu64 " unknown. Not adding stream.", | |
ffe60014 | 307 | new_stream->net_seq_idx); |
e316aad5 | 308 | consumer_del_stream(new_stream, NULL); |
3f8e211f | 309 | goto end_nosignal; |
00e2e675 DG |
310 | } |
311 | ||
633d0084 DG |
312 | if (ctx->on_recv_stream) { |
313 | ret = ctx->on_recv_stream(new_stream); | |
314 | if (ret < 0) { | |
e316aad5 | 315 | consumer_del_stream(new_stream, NULL); |
633d0084 | 316 | goto end_nosignal; |
fb3a43a9 | 317 | } |
633d0084 | 318 | } |
fb3a43a9 | 319 | |
50f8ae69 | 320 | /* Get the right pipe where the stream will be sent. */ |
633d0084 | 321 | if (new_stream->metadata_flag) { |
dae10966 | 322 | stream_pipe = ctx->consumer_metadata_pipe; |
3bd1e081 | 323 | } else { |
dae10966 | 324 | stream_pipe = ctx->consumer_data_pipe; |
50f8ae69 DG |
325 | } |
326 | ||
dae10966 | 327 | ret = lttng_pipe_write(stream_pipe, &new_stream, sizeof(new_stream)); |
50f8ae69 | 328 | if (ret < 0) { |
dae10966 | 329 | ERR("Consumer write %s stream to pipe %d", |
50f8ae69 | 330 | new_stream->metadata_flag ? "metadata" : "data", |
dae10966 | 331 | lttng_pipe_get_writefd(stream_pipe)); |
50f8ae69 DG |
332 | consumer_del_stream(new_stream, NULL); |
333 | goto end_nosignal; | |
3bd1e081 | 334 | } |
00e2e675 | 335 | |
50f8ae69 | 336 | DBG("Kernel consumer ADD_STREAM %s (fd: %d) with relayd id %" PRIu64, |
ffe60014 | 337 | new_stream->name, fd, new_stream->relayd_stream_id); |
3bd1e081 MD |
338 | break; |
339 | } | |
340 | case LTTNG_CONSUMER_UPDATE_STREAM: | |
341 | { | |
3f8e211f DG |
342 | rcu_read_unlock(); |
343 | return -ENOSYS; | |
344 | } | |
345 | case LTTNG_CONSUMER_DESTROY_RELAYD: | |
346 | { | |
a6ba4fe1 | 347 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
3f8e211f DG |
348 | struct consumer_relayd_sock_pair *relayd; |
349 | ||
a6ba4fe1 | 350 | DBG("Kernel consumer destroying relayd %" PRIu64, index); |
3f8e211f DG |
351 | |
352 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 353 | relayd = consumer_find_relayd(index); |
3f8e211f | 354 | if (relayd == NULL) { |
3448e266 | 355 | DBG("Unable to find relayd %" PRIu64, index); |
f50f23d9 | 356 | ret_code = LTTNG_ERR_NO_CONSUMER; |
3bd1e081 | 357 | } |
3f8e211f | 358 | |
a6ba4fe1 DG |
359 | /* |
360 | * Each relayd socket pair has a refcount of stream attached to it | |
361 | * which tells if the relayd is still active or not depending on the | |
362 | * refcount value. | |
363 | * | |
364 | * This will set the destroy flag of the relayd object and destroy it | |
365 | * if the refcount reaches zero when called. | |
366 | * | |
367 | * The destroy can happen either here or when a stream fd hangs up. | |
368 | */ | |
f50f23d9 DG |
369 | if (relayd) { |
370 | consumer_flag_relayd_for_destroy(relayd); | |
371 | } | |
372 | ||
373 | ret = consumer_send_status_msg(sock, ret_code); | |
374 | if (ret < 0) { | |
375 | /* Somehow, the session daemon is not responding anymore. */ | |
1803a064 | 376 | goto error_fatal; |
f50f23d9 | 377 | } |
3f8e211f | 378 | |
3f8e211f | 379 | goto end_nosignal; |
3bd1e081 | 380 | } |
6d805429 | 381 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 382 | { |
c8f59ee5 | 383 | int32_t ret; |
6d805429 | 384 | uint64_t id = msg.u.data_pending.session_id; |
c8f59ee5 | 385 | |
6d805429 | 386 | DBG("Kernel consumer data pending command for id %" PRIu64, id); |
c8f59ee5 | 387 | |
6d805429 | 388 | ret = consumer_data_pending(id); |
c8f59ee5 DG |
389 | |
390 | /* Send back returned value to session daemon */ | |
391 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
392 | if (ret < 0) { | |
6d805429 | 393 | PERROR("send data pending ret code"); |
1803a064 | 394 | goto error_fatal; |
c8f59ee5 | 395 | } |
f50f23d9 DG |
396 | |
397 | /* | |
398 | * No need to send back a status message since the data pending | |
399 | * returned value is the response. | |
400 | */ | |
c8f59ee5 | 401 | break; |
53632229 | 402 | } |
3bd1e081 | 403 | default: |
3f8e211f | 404 | goto end_nosignal; |
3bd1e081 | 405 | } |
3f8e211f | 406 | |
3bd1e081 | 407 | end_nosignal: |
b0b335c8 | 408 | rcu_read_unlock(); |
4cbc1a04 DG |
409 | |
410 | /* | |
411 | * Return 1 to indicate success since the 0 value can be a socket | |
412 | * shutdown during the recv() or send() call. | |
413 | */ | |
414 | return 1; | |
1803a064 MD |
415 | |
416 | error_fatal: | |
417 | rcu_read_unlock(); | |
418 | /* This will issue a consumer stop. */ | |
419 | return -1; | |
3bd1e081 | 420 | } |
d41f73b7 MD |
421 | |
422 | /* | |
423 | * Consume data on a file descriptor and write it on a trace file. | |
424 | */ | |
4078b776 | 425 | ssize_t lttng_kconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
426 | struct lttng_consumer_local_data *ctx) |
427 | { | |
1d4dfdef | 428 | unsigned long len, subbuf_size, padding; |
d41f73b7 | 429 | int err; |
4078b776 | 430 | ssize_t ret = 0; |
d41f73b7 MD |
431 | int infd = stream->wait_fd; |
432 | ||
433 | DBG("In read_subbuffer (infd : %d)", infd); | |
434 | /* Get the next subbuffer */ | |
435 | err = kernctl_get_next_subbuf(infd); | |
436 | if (err != 0) { | |
1d4dfdef | 437 | ret = err; |
d41f73b7 MD |
438 | /* |
439 | * This is a debug message even for single-threaded consumer, | |
440 | * because poll() have more relaxed criterions than get subbuf, | |
441 | * so get_subbuf may fail for short race windows where poll() | |
442 | * would issue wakeups. | |
443 | */ | |
444 | DBG("Reserving sub buffer failed (everything is normal, " | |
445 | "it is due to concurrency)"); | |
446 | goto end; | |
447 | } | |
448 | ||
1d4dfdef DG |
449 | /* Get the full subbuffer size including padding */ |
450 | err = kernctl_get_padded_subbuf_size(infd, &len); | |
451 | if (err != 0) { | |
452 | errno = -err; | |
453 | perror("Getting sub-buffer len failed."); | |
454 | ret = err; | |
455 | goto end; | |
456 | } | |
457 | ||
ffe60014 | 458 | switch (stream->chan->output) { |
1d4dfdef | 459 | case LTTNG_EVENT_SPLICE: |
d41f73b7 | 460 | |
1d4dfdef DG |
461 | /* |
462 | * XXX: The lttng-modules splice "actor" does not handle copying | |
463 | * partial pages hence only using the subbuffer size without the | |
464 | * padding makes the splice fail. | |
465 | */ | |
466 | subbuf_size = len; | |
467 | padding = 0; | |
468 | ||
469 | /* splice the subbuffer to the tracefile */ | |
91dfef6e DG |
470 | ret = lttng_consumer_on_read_subbuffer_splice(ctx, stream, subbuf_size, |
471 | padding); | |
472 | /* | |
473 | * XXX: Splice does not support network streaming so the return value | |
474 | * is simply checked against subbuf_size and not like the mmap() op. | |
475 | */ | |
1d4dfdef DG |
476 | if (ret != subbuf_size) { |
477 | /* | |
478 | * display the error but continue processing to try | |
479 | * to release the subbuffer | |
480 | */ | |
481 | ERR("Error splicing to tracefile (ret: %zd != len: %lu)", | |
482 | ret, subbuf_size); | |
483 | } | |
484 | break; | |
485 | case LTTNG_EVENT_MMAP: | |
486 | /* Get subbuffer size without padding */ | |
487 | err = kernctl_get_subbuf_size(infd, &subbuf_size); | |
488 | if (err != 0) { | |
489 | errno = -err; | |
490 | perror("Getting sub-buffer len failed."); | |
491 | ret = err; | |
492 | goto end; | |
493 | } | |
47e81c02 | 494 | |
1d4dfdef DG |
495 | /* Make sure the tracer is not gone mad on us! */ |
496 | assert(len >= subbuf_size); | |
497 | ||
498 | padding = len - subbuf_size; | |
499 | ||
500 | /* write the subbuffer to the tracefile */ | |
91dfef6e DG |
501 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, |
502 | padding); | |
503 | /* | |
504 | * The mmap operation should write subbuf_size amount of data when | |
505 | * network streaming or the full padding (len) size when we are _not_ | |
506 | * streaming. | |
507 | */ | |
d88aee68 DG |
508 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
509 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
1d4dfdef | 510 | /* |
91dfef6e DG |
511 | * Display the error but continue processing to try to release the |
512 | * subbuffer | |
1d4dfdef | 513 | */ |
91dfef6e DG |
514 | ERR("Error writing to tracefile " |
515 | "(ret: %zd != len: %lu != subbuf_size: %lu)", | |
516 | ret, len, subbuf_size); | |
1d4dfdef DG |
517 | } |
518 | break; | |
519 | default: | |
520 | ERR("Unknown output method"); | |
521 | ret = -1; | |
d41f73b7 MD |
522 | } |
523 | ||
524 | err = kernctl_put_next_subbuf(infd); | |
525 | if (err != 0) { | |
21073eaa | 526 | errno = -err; |
d41f73b7 MD |
527 | if (errno == EFAULT) { |
528 | perror("Error in unreserving sub buffer\n"); | |
529 | } else if (errno == EIO) { | |
530 | /* Should never happen with newer LTTng versions */ | |
531 | perror("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
532 | } | |
21073eaa DG |
533 | |
534 | ret = -err; | |
d41f73b7 MD |
535 | goto end; |
536 | } | |
537 | ||
538 | end: | |
539 | return ret; | |
540 | } | |
541 | ||
542 | int lttng_kconsumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
543 | { | |
544 | int ret; | |
ffe60014 DG |
545 | |
546 | assert(stream); | |
547 | ||
fe4477ee JD |
548 | /* Don't create anything if this is set for streaming. */ |
549 | if (stream->net_seq_idx == (uint64_t) -1ULL) { | |
550 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, | |
551 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
552 | stream->uid, stream->gid); | |
553 | if (ret < 0) { | |
554 | goto error; | |
555 | } | |
556 | stream->out_fd = ret; | |
557 | stream->tracefile_size_current = 0; | |
ffe60014 | 558 | } |
d41f73b7 | 559 | |
d41f73b7 MD |
560 | if (stream->output == LTTNG_EVENT_MMAP) { |
561 | /* get the len of the mmap region */ | |
562 | unsigned long mmap_len; | |
563 | ||
564 | ret = kernctl_get_mmap_len(stream->wait_fd, &mmap_len); | |
565 | if (ret != 0) { | |
87dc6a9c | 566 | errno = -ret; |
ffe60014 | 567 | PERROR("kernctl_get_mmap_len"); |
d41f73b7 MD |
568 | goto error_close_fd; |
569 | } | |
570 | stream->mmap_len = (size_t) mmap_len; | |
571 | ||
ffe60014 DG |
572 | stream->mmap_base = mmap(NULL, stream->mmap_len, PROT_READ, |
573 | MAP_PRIVATE, stream->wait_fd, 0); | |
d41f73b7 | 574 | if (stream->mmap_base == MAP_FAILED) { |
ffe60014 | 575 | PERROR("Error mmaping"); |
d41f73b7 MD |
576 | ret = -1; |
577 | goto error_close_fd; | |
578 | } | |
579 | } | |
580 | ||
581 | /* we return 0 to let the library handle the FD internally */ | |
582 | return 0; | |
583 | ||
584 | error_close_fd: | |
585 | { | |
586 | int err; | |
587 | ||
588 | err = close(stream->out_fd); | |
589 | assert(!err); | |
590 | } | |
591 | error: | |
592 | return ret; | |
593 | } | |
594 | ||
ca22feea DG |
595 | /* |
596 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
597 | * stream. Consumer data lock MUST be acquired before calling this function |
598 | * and the stream lock. | |
ca22feea | 599 | * |
6d805429 | 600 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
601 | * data is available for trace viewer reading. |
602 | */ | |
6d805429 | 603 | int lttng_kconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
604 | { |
605 | int ret; | |
606 | ||
607 | assert(stream); | |
608 | ||
ca22feea DG |
609 | ret = kernctl_get_next_subbuf(stream->wait_fd); |
610 | if (ret == 0) { | |
611 | /* There is still data so let's put back this subbuffer. */ | |
612 | ret = kernctl_put_subbuf(stream->wait_fd); | |
613 | assert(ret == 0); | |
6d805429 | 614 | ret = 1; /* Data is pending */ |
4e9a4686 | 615 | goto end; |
ca22feea DG |
616 | } |
617 | ||
6d805429 DG |
618 | /* Data is NOT pending and ready to be read. */ |
619 | ret = 0; | |
ca22feea | 620 | |
6efae65e DG |
621 | end: |
622 | return ret; | |
ca22feea | 623 | } |