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> |
00e2e675 | 37 | #include <common/relayd/relayd.h> |
fe4477ee | 38 | #include <common/utils.h> |
0857097f | 39 | |
10a8a223 | 40 | #include "kernel-consumer.h" |
3bd1e081 MD |
41 | |
42 | extern struct lttng_consumer_global_data consumer_data; | |
43 | extern int consumer_poll_timeout; | |
44 | extern volatile int consumer_quit; | |
45 | ||
3bd1e081 MD |
46 | /* |
47 | * Take a snapshot for a specific fd | |
48 | * | |
49 | * Returns 0 on success, < 0 on error | |
50 | */ | |
ffe60014 | 51 | int lttng_kconsumer_take_snapshot(struct lttng_consumer_stream *stream) |
3bd1e081 MD |
52 | { |
53 | int ret = 0; | |
54 | int infd = stream->wait_fd; | |
55 | ||
56 | ret = kernctl_snapshot(infd); | |
57 | if (ret != 0) { | |
87dc6a9c | 58 | errno = -ret; |
3bd1e081 MD |
59 | perror("Getting sub-buffer snapshot."); |
60 | } | |
61 | ||
62 | return ret; | |
63 | } | |
64 | ||
65 | /* | |
66 | * Get the produced position | |
67 | * | |
68 | * Returns 0 on success, < 0 on error | |
69 | */ | |
ffe60014 | 70 | int lttng_kconsumer_get_produced_snapshot(struct lttng_consumer_stream *stream, |
3bd1e081 MD |
71 | unsigned long *pos) |
72 | { | |
73 | int ret; | |
74 | int infd = stream->wait_fd; | |
75 | ||
76 | ret = kernctl_snapshot_get_produced(infd, pos); | |
77 | if (ret != 0) { | |
87dc6a9c | 78 | errno = -ret; |
3bd1e081 MD |
79 | perror("kernctl_snapshot_get_produced"); |
80 | } | |
81 | ||
82 | return ret; | |
83 | } | |
84 | ||
85 | int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, | |
86 | int sock, struct pollfd *consumer_sockpoll) | |
87 | { | |
88 | ssize_t ret; | |
f50f23d9 | 89 | enum lttng_error_code ret_code = LTTNG_OK; |
3bd1e081 MD |
90 | struct lttcomm_consumer_msg msg; |
91 | ||
92 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); | |
93 | if (ret != sizeof(msg)) { | |
f73fabfd | 94 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
3bd1e081 MD |
95 | return ret; |
96 | } | |
97 | if (msg.cmd_type == LTTNG_CONSUMER_STOP) { | |
f50f23d9 DG |
98 | /* |
99 | * Notify the session daemon that the command is completed. | |
100 | * | |
101 | * On transport layer error, the function call will print an error | |
102 | * message so handling the returned code is a bit useless since we | |
103 | * return an error code anyway. | |
104 | */ | |
105 | (void) consumer_send_status_msg(sock, ret_code); | |
3bd1e081 MD |
106 | return -ENOENT; |
107 | } | |
108 | ||
b0b335c8 MD |
109 | /* relayd needs RCU read-side protection */ |
110 | rcu_read_lock(); | |
111 | ||
3bd1e081 | 112 | switch (msg.cmd_type) { |
00e2e675 DG |
113 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
114 | { | |
f50f23d9 | 115 | /* Session daemon status message are handled in the following call. */ |
7735ef9e DG |
116 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
117 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, | |
46e6455f | 118 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id); |
00e2e675 DG |
119 | goto end_nosignal; |
120 | } | |
3bd1e081 MD |
121 | case LTTNG_CONSUMER_ADD_CHANNEL: |
122 | { | |
123 | struct lttng_consumer_channel *new_channel; | |
124 | ||
f50f23d9 DG |
125 | /* First send a status message before receiving the fds. */ |
126 | ret = consumer_send_status_msg(sock, ret_code); | |
127 | if (ret < 0) { | |
128 | /* Somehow, the session daemon is not responding anymore. */ | |
129 | goto end_nosignal; | |
130 | } | |
131 | ||
d88aee68 | 132 | DBG("consumer_add_channel %" PRIu64, msg.u.channel.channel_key); |
3bd1e081 | 133 | new_channel = consumer_allocate_channel(msg.u.channel.channel_key, |
ffe60014 DG |
134 | msg.u.channel.session_id, msg.u.channel.pathname, |
135 | msg.u.channel.name, msg.u.channel.uid, msg.u.channel.gid, | |
1624d5b7 JD |
136 | msg.u.channel.relayd_id, msg.u.channel.output, |
137 | msg.u.channel.tracefile_size, | |
138 | msg.u.channel.tracefile_count); | |
3bd1e081 | 139 | if (new_channel == NULL) { |
f73fabfd | 140 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
3bd1e081 MD |
141 | goto end_nosignal; |
142 | } | |
ffe60014 DG |
143 | new_channel->nb_init_stream_left = msg.u.channel.nb_init_streams; |
144 | ||
145 | /* Translate and save channel type. */ | |
146 | switch (msg.u.channel.type) { | |
147 | case CONSUMER_CHANNEL_TYPE_DATA: | |
148 | case CONSUMER_CHANNEL_TYPE_METADATA: | |
149 | new_channel->type = msg.u.channel.type; | |
150 | break; | |
151 | default: | |
152 | assert(0); | |
153 | goto end_nosignal; | |
154 | }; | |
155 | ||
3bd1e081 MD |
156 | if (ctx->on_recv_channel != NULL) { |
157 | ret = ctx->on_recv_channel(new_channel); | |
158 | if (ret == 0) { | |
d8ef542d | 159 | consumer_add_channel(new_channel, ctx); |
3bd1e081 MD |
160 | } else if (ret < 0) { |
161 | goto end_nosignal; | |
162 | } | |
163 | } else { | |
d8ef542d | 164 | consumer_add_channel(new_channel, ctx); |
3bd1e081 MD |
165 | } |
166 | goto end_nosignal; | |
167 | } | |
168 | case LTTNG_CONSUMER_ADD_STREAM: | |
169 | { | |
50f8ae69 | 170 | int fd, stream_pipe; |
00e2e675 DG |
171 | struct consumer_relayd_sock_pair *relayd = NULL; |
172 | struct lttng_consumer_stream *new_stream; | |
ffe60014 | 173 | struct lttng_consumer_channel *channel; |
c80048c6 | 174 | int alloc_ret = 0; |
3bd1e081 | 175 | |
ffe60014 DG |
176 | /* |
177 | * Get stream's channel reference. Needed when adding the stream to the | |
178 | * global hash table. | |
179 | */ | |
180 | channel = consumer_find_channel(msg.u.stream.channel_key); | |
181 | if (!channel) { | |
182 | /* | |
183 | * We could not find the channel. Can happen if cpu hotplug | |
184 | * happens while tearing down. | |
185 | */ | |
d88aee68 | 186 | ERR("Unable to find channel key %" PRIu64, msg.u.stream.channel_key); |
ffe60014 DG |
187 | ret_code = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
188 | } | |
189 | ||
f50f23d9 DG |
190 | /* First send a status message before receiving the fds. */ |
191 | ret = consumer_send_status_msg(sock, ret_code); | |
ffe60014 DG |
192 | if (ret < 0 || ret_code != LTTNG_OK) { |
193 | /* | |
194 | * Somehow, the session daemon is not responding anymore or the | |
195 | * channel was not found. | |
196 | */ | |
f50f23d9 DG |
197 | goto end_nosignal; |
198 | } | |
199 | ||
3bd1e081 MD |
200 | /* block */ |
201 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
3f8e211f | 202 | rcu_read_unlock(); |
3bd1e081 MD |
203 | return -EINTR; |
204 | } | |
00e2e675 DG |
205 | |
206 | /* Get stream file descriptor from socket */ | |
f2fc6720 MD |
207 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); |
208 | if (ret != sizeof(fd)) { | |
f73fabfd | 209 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
3f8e211f | 210 | rcu_read_unlock(); |
3bd1e081 MD |
211 | return ret; |
212 | } | |
3bd1e081 | 213 | |
f50f23d9 DG |
214 | /* |
215 | * Send status code to session daemon only if the recv works. If the | |
216 | * above recv() failed, the session daemon is notified through the | |
217 | * error socket and the teardown is eventually done. | |
218 | */ | |
219 | ret = consumer_send_status_msg(sock, ret_code); | |
220 | if (ret < 0) { | |
221 | /* Somehow, the session daemon is not responding anymore. */ | |
222 | goto end_nosignal; | |
223 | } | |
224 | ||
ffe60014 DG |
225 | new_stream = consumer_allocate_stream(channel->key, |
226 | fd, | |
227 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
228 | channel->name, | |
229 | channel->uid, | |
230 | channel->gid, | |
231 | channel->relayd_id, | |
232 | channel->session_id, | |
233 | msg.u.stream.cpu, | |
234 | &alloc_ret, | |
235 | channel->type); | |
3bd1e081 | 236 | if (new_stream == NULL) { |
c80048c6 MD |
237 | switch (alloc_ret) { |
238 | case -ENOMEM: | |
239 | case -EINVAL: | |
240 | default: | |
241 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
242 | break; | |
c80048c6 | 243 | } |
3f8e211f | 244 | goto end_nosignal; |
3bd1e081 | 245 | } |
ffe60014 DG |
246 | new_stream->chan = channel; |
247 | new_stream->wait_fd = fd; | |
00e2e675 | 248 | |
fb3a43a9 DG |
249 | /* |
250 | * The buffer flush is done on the session daemon side for the kernel | |
251 | * so no need for the stream "hangup_flush_done" variable to be | |
252 | * tracked. This is important for a kernel stream since we don't rely | |
253 | * on the flush state of the stream to read data. It's not the case for | |
254 | * user space tracing. | |
255 | */ | |
256 | new_stream->hangup_flush_done = 0; | |
257 | ||
00e2e675 | 258 | /* The stream is not metadata. Get relayd reference if exists. */ |
ffe60014 | 259 | relayd = consumer_find_relayd(new_stream->net_seq_idx); |
00e2e675 DG |
260 | if (relayd != NULL) { |
261 | /* Add stream on the relayd */ | |
262 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
263 | ret = relayd_add_stream(&relayd->control_sock, | |
ffe60014 | 264 | new_stream->name, new_stream->chan->pathname, |
00e2e675 DG |
265 | &new_stream->relayd_stream_id); |
266 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
267 | if (ret < 0) { | |
e316aad5 | 268 | consumer_del_stream(new_stream, NULL); |
3f8e211f | 269 | goto end_nosignal; |
00e2e675 | 270 | } |
d88aee68 DG |
271 | } else if (new_stream->net_seq_idx != (uint64_t) -1ULL) { |
272 | ERR("Network sequence index %" PRIu64 " unknown. Not adding stream.", | |
ffe60014 | 273 | new_stream->net_seq_idx); |
e316aad5 | 274 | consumer_del_stream(new_stream, NULL); |
3f8e211f | 275 | goto end_nosignal; |
00e2e675 DG |
276 | } |
277 | ||
633d0084 DG |
278 | if (ctx->on_recv_stream) { |
279 | ret = ctx->on_recv_stream(new_stream); | |
280 | if (ret < 0) { | |
e316aad5 | 281 | consumer_del_stream(new_stream, NULL); |
633d0084 | 282 | goto end_nosignal; |
fb3a43a9 | 283 | } |
633d0084 | 284 | } |
fb3a43a9 | 285 | |
50f8ae69 | 286 | /* Get the right pipe where the stream will be sent. */ |
633d0084 | 287 | if (new_stream->metadata_flag) { |
50f8ae69 | 288 | stream_pipe = ctx->consumer_metadata_pipe[1]; |
3bd1e081 | 289 | } else { |
50f8ae69 DG |
290 | stream_pipe = ctx->consumer_data_pipe[1]; |
291 | } | |
292 | ||
293 | do { | |
294 | ret = write(stream_pipe, &new_stream, sizeof(new_stream)); | |
295 | } while (ret < 0 && errno == EINTR); | |
296 | if (ret < 0) { | |
297 | PERROR("Consumer write %s stream to pipe %d", | |
298 | new_stream->metadata_flag ? "metadata" : "data", | |
299 | stream_pipe); | |
300 | consumer_del_stream(new_stream, NULL); | |
301 | goto end_nosignal; | |
3bd1e081 | 302 | } |
00e2e675 | 303 | |
50f8ae69 | 304 | DBG("Kernel consumer ADD_STREAM %s (fd: %d) with relayd id %" PRIu64, |
ffe60014 | 305 | new_stream->name, fd, new_stream->relayd_stream_id); |
3bd1e081 MD |
306 | break; |
307 | } | |
308 | case LTTNG_CONSUMER_UPDATE_STREAM: | |
309 | { | |
3f8e211f DG |
310 | rcu_read_unlock(); |
311 | return -ENOSYS; | |
312 | } | |
313 | case LTTNG_CONSUMER_DESTROY_RELAYD: | |
314 | { | |
a6ba4fe1 | 315 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
3f8e211f DG |
316 | struct consumer_relayd_sock_pair *relayd; |
317 | ||
a6ba4fe1 | 318 | DBG("Kernel consumer destroying relayd %" PRIu64, index); |
3f8e211f DG |
319 | |
320 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 321 | relayd = consumer_find_relayd(index); |
3f8e211f | 322 | if (relayd == NULL) { |
3448e266 | 323 | DBG("Unable to find relayd %" PRIu64, index); |
f50f23d9 | 324 | ret_code = LTTNG_ERR_NO_CONSUMER; |
3bd1e081 | 325 | } |
3f8e211f | 326 | |
a6ba4fe1 DG |
327 | /* |
328 | * Each relayd socket pair has a refcount of stream attached to it | |
329 | * which tells if the relayd is still active or not depending on the | |
330 | * refcount value. | |
331 | * | |
332 | * This will set the destroy flag of the relayd object and destroy it | |
333 | * if the refcount reaches zero when called. | |
334 | * | |
335 | * The destroy can happen either here or when a stream fd hangs up. | |
336 | */ | |
f50f23d9 DG |
337 | if (relayd) { |
338 | consumer_flag_relayd_for_destroy(relayd); | |
339 | } | |
340 | ||
341 | ret = consumer_send_status_msg(sock, ret_code); | |
342 | if (ret < 0) { | |
343 | /* Somehow, the session daemon is not responding anymore. */ | |
344 | goto end_nosignal; | |
345 | } | |
3f8e211f | 346 | |
3f8e211f | 347 | goto end_nosignal; |
3bd1e081 | 348 | } |
6d805429 | 349 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 350 | { |
c8f59ee5 | 351 | int32_t ret; |
6d805429 | 352 | uint64_t id = msg.u.data_pending.session_id; |
c8f59ee5 | 353 | |
6d805429 | 354 | DBG("Kernel consumer data pending command for id %" PRIu64, id); |
c8f59ee5 | 355 | |
6d805429 | 356 | ret = consumer_data_pending(id); |
c8f59ee5 DG |
357 | |
358 | /* Send back returned value to session daemon */ | |
359 | ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret)); | |
360 | if (ret < 0) { | |
6d805429 | 361 | PERROR("send data pending ret code"); |
c8f59ee5 | 362 | } |
f50f23d9 DG |
363 | |
364 | /* | |
365 | * No need to send back a status message since the data pending | |
366 | * returned value is the response. | |
367 | */ | |
c8f59ee5 | 368 | break; |
53632229 | 369 | } |
3bd1e081 | 370 | default: |
3f8e211f | 371 | goto end_nosignal; |
3bd1e081 | 372 | } |
3f8e211f | 373 | |
3bd1e081 | 374 | end_nosignal: |
b0b335c8 | 375 | rcu_read_unlock(); |
4cbc1a04 DG |
376 | |
377 | /* | |
378 | * Return 1 to indicate success since the 0 value can be a socket | |
379 | * shutdown during the recv() or send() call. | |
380 | */ | |
381 | return 1; | |
3bd1e081 | 382 | } |
d41f73b7 MD |
383 | |
384 | /* | |
385 | * Consume data on a file descriptor and write it on a trace file. | |
386 | */ | |
4078b776 | 387 | ssize_t lttng_kconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
d41f73b7 MD |
388 | struct lttng_consumer_local_data *ctx) |
389 | { | |
1d4dfdef | 390 | unsigned long len, subbuf_size, padding; |
d41f73b7 | 391 | int err; |
4078b776 | 392 | ssize_t ret = 0; |
d41f73b7 MD |
393 | int infd = stream->wait_fd; |
394 | ||
395 | DBG("In read_subbuffer (infd : %d)", infd); | |
396 | /* Get the next subbuffer */ | |
397 | err = kernctl_get_next_subbuf(infd); | |
398 | if (err != 0) { | |
1d4dfdef | 399 | ret = err; |
d41f73b7 MD |
400 | /* |
401 | * This is a debug message even for single-threaded consumer, | |
402 | * because poll() have more relaxed criterions than get subbuf, | |
403 | * so get_subbuf may fail for short race windows where poll() | |
404 | * would issue wakeups. | |
405 | */ | |
406 | DBG("Reserving sub buffer failed (everything is normal, " | |
407 | "it is due to concurrency)"); | |
408 | goto end; | |
409 | } | |
410 | ||
1d4dfdef DG |
411 | /* Get the full subbuffer size including padding */ |
412 | err = kernctl_get_padded_subbuf_size(infd, &len); | |
413 | if (err != 0) { | |
414 | errno = -err; | |
415 | perror("Getting sub-buffer len failed."); | |
416 | ret = err; | |
417 | goto end; | |
418 | } | |
419 | ||
ffe60014 | 420 | switch (stream->chan->output) { |
1d4dfdef | 421 | case LTTNG_EVENT_SPLICE: |
d41f73b7 | 422 | |
1d4dfdef DG |
423 | /* |
424 | * XXX: The lttng-modules splice "actor" does not handle copying | |
425 | * partial pages hence only using the subbuffer size without the | |
426 | * padding makes the splice fail. | |
427 | */ | |
428 | subbuf_size = len; | |
429 | padding = 0; | |
430 | ||
431 | /* splice the subbuffer to the tracefile */ | |
91dfef6e DG |
432 | ret = lttng_consumer_on_read_subbuffer_splice(ctx, stream, subbuf_size, |
433 | padding); | |
434 | /* | |
435 | * XXX: Splice does not support network streaming so the return value | |
436 | * is simply checked against subbuf_size and not like the mmap() op. | |
437 | */ | |
1d4dfdef DG |
438 | if (ret != subbuf_size) { |
439 | /* | |
440 | * display the error but continue processing to try | |
441 | * to release the subbuffer | |
442 | */ | |
443 | ERR("Error splicing to tracefile (ret: %zd != len: %lu)", | |
444 | ret, subbuf_size); | |
445 | } | |
446 | break; | |
447 | case LTTNG_EVENT_MMAP: | |
448 | /* Get subbuffer size without padding */ | |
449 | err = kernctl_get_subbuf_size(infd, &subbuf_size); | |
450 | if (err != 0) { | |
451 | errno = -err; | |
452 | perror("Getting sub-buffer len failed."); | |
453 | ret = err; | |
454 | goto end; | |
455 | } | |
47e81c02 | 456 | |
1d4dfdef DG |
457 | /* Make sure the tracer is not gone mad on us! */ |
458 | assert(len >= subbuf_size); | |
459 | ||
460 | padding = len - subbuf_size; | |
461 | ||
462 | /* write the subbuffer to the tracefile */ | |
91dfef6e DG |
463 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, |
464 | padding); | |
465 | /* | |
466 | * The mmap operation should write subbuf_size amount of data when | |
467 | * network streaming or the full padding (len) size when we are _not_ | |
468 | * streaming. | |
469 | */ | |
d88aee68 DG |
470 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
471 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
1d4dfdef | 472 | /* |
91dfef6e DG |
473 | * Display the error but continue processing to try to release the |
474 | * subbuffer | |
1d4dfdef | 475 | */ |
91dfef6e DG |
476 | ERR("Error writing to tracefile " |
477 | "(ret: %zd != len: %lu != subbuf_size: %lu)", | |
478 | ret, len, subbuf_size); | |
1d4dfdef DG |
479 | } |
480 | break; | |
481 | default: | |
482 | ERR("Unknown output method"); | |
483 | ret = -1; | |
d41f73b7 MD |
484 | } |
485 | ||
486 | err = kernctl_put_next_subbuf(infd); | |
487 | if (err != 0) { | |
21073eaa | 488 | errno = -err; |
d41f73b7 MD |
489 | if (errno == EFAULT) { |
490 | perror("Error in unreserving sub buffer\n"); | |
491 | } else if (errno == EIO) { | |
492 | /* Should never happen with newer LTTng versions */ | |
493 | perror("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
494 | } | |
21073eaa DG |
495 | |
496 | ret = -err; | |
d41f73b7 MD |
497 | goto end; |
498 | } | |
499 | ||
500 | end: | |
501 | return ret; | |
502 | } | |
503 | ||
504 | int lttng_kconsumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
505 | { | |
506 | int ret; | |
ffe60014 DG |
507 | |
508 | assert(stream); | |
509 | ||
fe4477ee JD |
510 | /* Don't create anything if this is set for streaming. */ |
511 | if (stream->net_seq_idx == (uint64_t) -1ULL) { | |
512 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, | |
513 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
514 | stream->uid, stream->gid); | |
515 | if (ret < 0) { | |
516 | goto error; | |
517 | } | |
518 | stream->out_fd = ret; | |
519 | stream->tracefile_size_current = 0; | |
ffe60014 | 520 | } |
d41f73b7 | 521 | |
d41f73b7 MD |
522 | if (stream->output == LTTNG_EVENT_MMAP) { |
523 | /* get the len of the mmap region */ | |
524 | unsigned long mmap_len; | |
525 | ||
526 | ret = kernctl_get_mmap_len(stream->wait_fd, &mmap_len); | |
527 | if (ret != 0) { | |
87dc6a9c | 528 | errno = -ret; |
ffe60014 | 529 | PERROR("kernctl_get_mmap_len"); |
d41f73b7 MD |
530 | goto error_close_fd; |
531 | } | |
532 | stream->mmap_len = (size_t) mmap_len; | |
533 | ||
ffe60014 DG |
534 | stream->mmap_base = mmap(NULL, stream->mmap_len, PROT_READ, |
535 | MAP_PRIVATE, stream->wait_fd, 0); | |
d41f73b7 | 536 | if (stream->mmap_base == MAP_FAILED) { |
ffe60014 | 537 | PERROR("Error mmaping"); |
d41f73b7 MD |
538 | ret = -1; |
539 | goto error_close_fd; | |
540 | } | |
541 | } | |
542 | ||
543 | /* we return 0 to let the library handle the FD internally */ | |
544 | return 0; | |
545 | ||
546 | error_close_fd: | |
547 | { | |
548 | int err; | |
549 | ||
550 | err = close(stream->out_fd); | |
551 | assert(!err); | |
552 | } | |
553 | error: | |
554 | return ret; | |
555 | } | |
556 | ||
ca22feea DG |
557 | /* |
558 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
559 | * stream. Consumer data lock MUST be acquired before calling this function |
560 | * and the stream lock. | |
ca22feea | 561 | * |
6d805429 | 562 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
563 | * data is available for trace viewer reading. |
564 | */ | |
6d805429 | 565 | int lttng_kconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
566 | { |
567 | int ret; | |
568 | ||
569 | assert(stream); | |
570 | ||
ca22feea DG |
571 | ret = kernctl_get_next_subbuf(stream->wait_fd); |
572 | if (ret == 0) { | |
573 | /* There is still data so let's put back this subbuffer. */ | |
574 | ret = kernctl_put_subbuf(stream->wait_fd); | |
575 | assert(ret == 0); | |
6d805429 | 576 | ret = 1; /* Data is pending */ |
4e9a4686 | 577 | goto end; |
ca22feea DG |
578 | } |
579 | ||
6d805429 DG |
580 | /* Data is NOT pending and ready to be read. */ |
581 | ret = 0; | |
ca22feea | 582 | |
6efae65e DG |
583 | end: |
584 | return ret; | |
ca22feea | 585 | } |