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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 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License | |
7 | * as published by the Free Software Foundation; only version 2 | |
8 | * of the License. | |
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 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
18 | */ | |
19 | ||
20 | #define _GNU_SOURCE | |
21 | #include <assert.h> | |
22 | #include <fcntl.h> | |
23 | #include <poll.h> | |
24 | #include <pthread.h> | |
25 | #include <stdlib.h> | |
26 | #include <string.h> | |
27 | #include <sys/mman.h> | |
28 | #include <sys/socket.h> | |
29 | #include <sys/types.h> | |
30 | #include <unistd.h> | |
31 | ||
32 | #include <lttng-kernel-ctl.h> | |
33 | #include <lttng-sessiond-comm.h> | |
34 | #include <lttng/lttng-consumer.h> | |
35 | #include <lttng/lttng-kconsumer.h> | |
36 | #include <lttng/lttng-ustconsumer.h> | |
37 | #include <lttngerr.h> | |
38 | ||
39 | struct lttng_consumer_global_data consumer_data = { | |
40 | .stream_list.head = CDS_LIST_HEAD_INIT(consumer_data.stream_list.head), | |
41 | .channel_list.head = CDS_LIST_HEAD_INIT(consumer_data.channel_list.head), | |
42 | .stream_count = 0, | |
43 | .need_update = 1, | |
44 | .type = LTTNG_CONSUMER_UNKNOWN, | |
45 | }; | |
46 | ||
47 | /* timeout parameter, to control the polling thread grace period. */ | |
48 | int consumer_poll_timeout = -1; | |
49 | ||
50 | /* | |
51 | * Flag to inform the polling thread to quit when all fd hung up. Updated by | |
52 | * the consumer_thread_receive_fds when it notices that all fds has hung up. | |
53 | * Also updated by the signal handler (consumer_should_exit()). Read by the | |
54 | * polling threads. | |
55 | */ | |
56 | volatile int consumer_quit = 0; | |
57 | ||
58 | /* | |
59 | * Find a stream. The consumer_data.lock must be locked during this | |
60 | * call. | |
61 | */ | |
62 | static struct lttng_consumer_stream *consumer_find_stream(int key) | |
63 | { | |
64 | struct lttng_consumer_stream *iter; | |
65 | ||
66 | cds_list_for_each_entry(iter, &consumer_data.stream_list.head, list) { | |
67 | if (iter->key == key) { | |
68 | DBG("Found stream key %d", key); | |
69 | return iter; | |
70 | } | |
71 | } | |
72 | return NULL; | |
73 | } | |
74 | ||
75 | static struct lttng_consumer_channel *consumer_find_channel(int key) | |
76 | { | |
77 | struct lttng_consumer_channel *iter; | |
78 | ||
79 | cds_list_for_each_entry(iter, &consumer_data.channel_list.head, list) { | |
80 | if (iter->key == key) { | |
81 | DBG("Found channel key %d", key); | |
82 | return iter; | |
83 | } | |
84 | } | |
85 | return NULL; | |
86 | } | |
87 | ||
88 | /* | |
89 | * Remove a stream from the global list protected by a mutex. This | |
90 | * function is also responsible for freeing its data structures. | |
91 | */ | |
92 | void consumer_del_stream(struct lttng_consumer_stream *stream) | |
93 | { | |
94 | int ret; | |
95 | struct lttng_consumer_channel *free_chan = NULL; | |
96 | ||
97 | pthread_mutex_lock(&consumer_data.lock); | |
98 | ||
99 | switch (consumer_data.type) { | |
100 | case LTTNG_CONSUMER_KERNEL: | |
101 | if (stream->mmap_base != NULL) { | |
102 | ret = munmap(stream->mmap_base, stream->mmap_len); | |
103 | if (ret != 0) { | |
104 | perror("munmap"); | |
105 | } | |
106 | } | |
107 | break; | |
108 | case LTTNG_CONSUMER_UST: | |
109 | lttng_ustconsumer_del_stream(stream); | |
110 | break; | |
111 | default: | |
112 | ERR("Unknown consumer_data type"); | |
113 | assert(0); | |
114 | goto end; | |
115 | } | |
116 | ||
117 | cds_list_del(&stream->list); | |
118 | if (consumer_data.stream_count <= 0) { | |
119 | goto end; | |
120 | } | |
121 | consumer_data.stream_count--; | |
122 | if (!stream) { | |
123 | goto end; | |
124 | } | |
125 | if (stream->out_fd >= 0) { | |
126 | close(stream->out_fd); | |
127 | } | |
128 | if (stream->wait_fd >= 0) { | |
129 | close(stream->wait_fd); | |
130 | } | |
131 | if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) { | |
132 | close(stream->shm_fd); | |
133 | } | |
134 | if (!--stream->chan->refcount) | |
135 | free_chan = stream->chan; | |
136 | free(stream); | |
137 | end: | |
138 | consumer_data.need_update = 1; | |
139 | pthread_mutex_unlock(&consumer_data.lock); | |
140 | ||
141 | if (free_chan) | |
142 | consumer_del_channel(free_chan); | |
143 | } | |
144 | ||
145 | struct lttng_consumer_stream *consumer_allocate_stream( | |
146 | int channel_key, int stream_key, | |
147 | int shm_fd, int wait_fd, | |
148 | enum lttng_consumer_stream_state state, | |
149 | uint64_t mmap_len, | |
150 | enum lttng_event_output output, | |
151 | const char *path_name) | |
152 | { | |
153 | struct lttng_consumer_stream *stream; | |
154 | int ret; | |
155 | ||
156 | stream = malloc(sizeof(*stream)); | |
157 | if (stream == NULL) { | |
158 | perror("malloc struct lttng_consumer_stream"); | |
159 | goto end; | |
160 | } | |
161 | stream->chan = consumer_find_channel(channel_key); | |
162 | if (!stream->chan) { | |
163 | perror("Unable to find channel key"); | |
164 | goto end; | |
165 | } | |
166 | stream->chan->refcount++; | |
167 | stream->key = stream_key; | |
168 | stream->shm_fd = shm_fd; | |
169 | stream->wait_fd = wait_fd; | |
170 | stream->out_fd = -1; | |
171 | stream->out_fd_offset = 0; | |
172 | stream->state = state; | |
173 | stream->mmap_len = mmap_len; | |
174 | stream->mmap_base = NULL; | |
175 | stream->output = output; | |
176 | strncpy(stream->path_name, path_name, PATH_MAX - 1); | |
177 | stream->path_name[PATH_MAX - 1] = '\0'; | |
178 | ||
179 | switch (consumer_data.type) { | |
180 | case LTTNG_CONSUMER_KERNEL: | |
181 | break; | |
182 | case LTTNG_CONSUMER_UST: | |
183 | ret = lttng_ustconsumer_allocate_stream(stream); | |
184 | if (ret) { | |
185 | free(stream); | |
186 | return NULL; | |
187 | } | |
188 | break; | |
189 | default: | |
190 | ERR("Unknown consumer_data type"); | |
191 | assert(0); | |
192 | goto end; | |
193 | } | |
194 | DBG("Allocated stream %s (key %d, shm_fd %d, wait_fd %d, mmap_len %llu, out_fd %d)", | |
195 | stream->path_name, stream->key, | |
196 | stream->shm_fd, | |
197 | stream->wait_fd, | |
198 | (unsigned long long) stream->mmap_len, | |
199 | stream->out_fd); | |
200 | end: | |
201 | return stream; | |
202 | } | |
203 | ||
204 | /* | |
205 | * Add a stream to the global list protected by a mutex. | |
206 | */ | |
207 | int consumer_add_stream(struct lttng_consumer_stream *stream) | |
208 | { | |
209 | int ret = 0; | |
210 | ||
211 | pthread_mutex_lock(&consumer_data.lock); | |
212 | /* Check if already exist */ | |
213 | if (consumer_find_stream(stream->key)) { | |
214 | ret = -1; | |
215 | goto end; | |
216 | } | |
217 | cds_list_add(&stream->list, &consumer_data.stream_list.head); | |
218 | consumer_data.stream_count++; | |
219 | consumer_data.need_update = 1; | |
220 | ||
221 | switch (consumer_data.type) { | |
222 | case LTTNG_CONSUMER_KERNEL: | |
223 | break; | |
224 | case LTTNG_CONSUMER_UST: | |
225 | /* Streams are in CPU number order (we rely on this) */ | |
226 | stream->cpu = stream->chan->nr_streams++; | |
227 | break; | |
228 | default: | |
229 | ERR("Unknown consumer_data type"); | |
230 | assert(0); | |
231 | goto end; | |
232 | } | |
233 | ||
234 | end: | |
235 | pthread_mutex_unlock(&consumer_data.lock); | |
236 | return ret; | |
237 | } | |
238 | ||
239 | /* | |
240 | * Update a stream according to what we just received. | |
241 | */ | |
242 | void consumer_change_stream_state(int stream_key, | |
243 | enum lttng_consumer_stream_state state) | |
244 | { | |
245 | struct lttng_consumer_stream *stream; | |
246 | ||
247 | pthread_mutex_lock(&consumer_data.lock); | |
248 | stream = consumer_find_stream(stream_key); | |
249 | if (stream) { | |
250 | stream->state = state; | |
251 | } | |
252 | consumer_data.need_update = 1; | |
253 | pthread_mutex_unlock(&consumer_data.lock); | |
254 | } | |
255 | ||
256 | /* | |
257 | * Remove a channel from the global list protected by a mutex. This | |
258 | * function is also responsible for freeing its data structures. | |
259 | */ | |
260 | void consumer_del_channel(struct lttng_consumer_channel *channel) | |
261 | { | |
262 | int ret; | |
263 | ||
264 | pthread_mutex_lock(&consumer_data.lock); | |
265 | ||
266 | switch (consumer_data.type) { | |
267 | case LTTNG_CONSUMER_KERNEL: | |
268 | break; | |
269 | case LTTNG_CONSUMER_UST: | |
270 | lttng_ustconsumer_del_channel(channel); | |
271 | break; | |
272 | default: | |
273 | ERR("Unknown consumer_data type"); | |
274 | assert(0); | |
275 | goto end; | |
276 | } | |
277 | ||
278 | cds_list_del(&channel->list); | |
279 | if (channel->mmap_base != NULL) { | |
280 | ret = munmap(channel->mmap_base, channel->mmap_len); | |
281 | if (ret != 0) { | |
282 | perror("munmap"); | |
283 | } | |
284 | } | |
285 | if (channel->wait_fd >= 0) { | |
286 | close(channel->wait_fd); | |
287 | } | |
288 | if (channel->shm_fd >= 0 && channel->wait_fd != channel->shm_fd) { | |
289 | close(channel->shm_fd); | |
290 | } | |
291 | free(channel); | |
292 | end: | |
293 | pthread_mutex_unlock(&consumer_data.lock); | |
294 | } | |
295 | ||
296 | struct lttng_consumer_channel *consumer_allocate_channel( | |
297 | int channel_key, | |
298 | int shm_fd, int wait_fd, | |
299 | uint64_t mmap_len, | |
300 | uint64_t max_sb_size) | |
301 | { | |
302 | struct lttng_consumer_channel *channel; | |
303 | int ret; | |
304 | ||
305 | channel = malloc(sizeof(*channel)); | |
306 | if (channel == NULL) { | |
307 | perror("malloc struct lttng_consumer_channel"); | |
308 | goto end; | |
309 | } | |
310 | channel->key = channel_key; | |
311 | channel->shm_fd = shm_fd; | |
312 | channel->wait_fd = wait_fd; | |
313 | channel->mmap_len = mmap_len; | |
314 | channel->max_sb_size = max_sb_size; | |
315 | channel->refcount = 0; | |
316 | channel->nr_streams = 0; | |
317 | ||
318 | switch (consumer_data.type) { | |
319 | case LTTNG_CONSUMER_KERNEL: | |
320 | channel->mmap_base = NULL; | |
321 | channel->mmap_len = 0; | |
322 | break; | |
323 | case LTTNG_CONSUMER_UST: | |
324 | ret = lttng_ustconsumer_allocate_channel(channel); | |
325 | if (ret) { | |
326 | free(channel); | |
327 | return NULL; | |
328 | } | |
329 | break; | |
330 | default: | |
331 | ERR("Unknown consumer_data type"); | |
332 | assert(0); | |
333 | goto end; | |
334 | } | |
335 | DBG("Allocated channel (key %d, shm_fd %d, wait_fd %d, mmap_len %llu, max_sb_size %llu)", | |
336 | channel->key, | |
337 | channel->shm_fd, | |
338 | channel->wait_fd, | |
339 | (unsigned long long) channel->mmap_len, | |
340 | (unsigned long long) channel->max_sb_size); | |
341 | end: | |
342 | return channel; | |
343 | } | |
344 | ||
345 | /* | |
346 | * Add a channel to the global list protected by a mutex. | |
347 | */ | |
348 | int consumer_add_channel(struct lttng_consumer_channel *channel) | |
349 | { | |
350 | int ret = 0; | |
351 | ||
352 | pthread_mutex_lock(&consumer_data.lock); | |
353 | /* Check if already exist */ | |
354 | if (consumer_find_channel(channel->key)) { | |
355 | ret = -1; | |
356 | goto end; | |
357 | } | |
358 | cds_list_add(&channel->list, &consumer_data.channel_list.head); | |
359 | end: | |
360 | pthread_mutex_unlock(&consumer_data.lock); | |
361 | return ret; | |
362 | } | |
363 | ||
364 | /* | |
365 | * Allocate the pollfd structure and the local view of the out fds to avoid | |
366 | * doing a lookup in the linked list and concurrency issues when writing is | |
367 | * needed. Called with consumer_data.lock held. | |
368 | * | |
369 | * Returns the number of fds in the structures. | |
370 | */ | |
371 | int consumer_update_poll_array( | |
372 | struct lttng_consumer_local_data *ctx, struct pollfd **pollfd, | |
373 | struct lttng_consumer_stream **local_stream) | |
374 | { | |
375 | struct lttng_consumer_stream *iter; | |
376 | int i = 0; | |
377 | ||
378 | DBG("Updating poll fd array"); | |
379 | cds_list_for_each_entry(iter, &consumer_data.stream_list.head, list) { | |
380 | if (iter->state != LTTNG_CONSUMER_ACTIVE_STREAM) { | |
381 | continue; | |
382 | } | |
383 | DBG("Active FD %d", iter->wait_fd); | |
384 | (*pollfd)[i].fd = iter->wait_fd; | |
385 | (*pollfd)[i].events = POLLIN | POLLPRI; | |
386 | local_stream[i] = iter; | |
387 | i++; | |
388 | } | |
389 | ||
390 | /* | |
391 | * Insert the consumer_poll_pipe at the end of the array and don't | |
392 | * increment i so nb_fd is the number of real FD. | |
393 | */ | |
394 | (*pollfd)[i].fd = ctx->consumer_poll_pipe[0]; | |
395 | (*pollfd)[i].events = POLLIN; | |
396 | return i; | |
397 | } | |
398 | ||
399 | /* | |
400 | * Poll on the should_quit pipe and the command socket return -1 on error and | |
401 | * should exit, 0 if data is available on the command socket | |
402 | */ | |
403 | int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll) | |
404 | { | |
405 | int num_rdy; | |
406 | ||
407 | num_rdy = poll(consumer_sockpoll, 2, -1); | |
408 | if (num_rdy == -1) { | |
409 | perror("Poll error"); | |
410 | goto exit; | |
411 | } | |
412 | if (consumer_sockpoll[0].revents == POLLIN) { | |
413 | DBG("consumer_should_quit wake up"); | |
414 | goto exit; | |
415 | } | |
416 | return 0; | |
417 | ||
418 | exit: | |
419 | return -1; | |
420 | } | |
421 | ||
422 | /* | |
423 | * Set the error socket. | |
424 | */ | |
425 | void lttng_consumer_set_error_sock( | |
426 | struct lttng_consumer_local_data *ctx, int sock) | |
427 | { | |
428 | ctx->consumer_error_socket = sock; | |
429 | } | |
430 | ||
431 | /* | |
432 | * Set the command socket path. | |
433 | */ | |
434 | ||
435 | void lttng_consumer_set_command_sock_path( | |
436 | struct lttng_consumer_local_data *ctx, char *sock) | |
437 | { | |
438 | ctx->consumer_command_sock_path = sock; | |
439 | } | |
440 | ||
441 | /* | |
442 | * Send return code to the session daemon. | |
443 | * If the socket is not defined, we return 0, it is not a fatal error | |
444 | */ | |
445 | int lttng_consumer_send_error( | |
446 | struct lttng_consumer_local_data *ctx, int cmd) | |
447 | { | |
448 | if (ctx->consumer_error_socket > 0) { | |
449 | return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd, | |
450 | sizeof(enum lttcomm_sessiond_command)); | |
451 | } | |
452 | ||
453 | return 0; | |
454 | } | |
455 | ||
456 | /* | |
457 | * Close all the tracefiles and stream fds, should be called when all instances | |
458 | * are destroyed. | |
459 | */ | |
460 | void lttng_consumer_cleanup(void) | |
461 | { | |
462 | struct lttng_consumer_stream *iter, *tmp; | |
463 | struct lttng_consumer_channel *citer, *ctmp; | |
464 | ||
465 | /* | |
466 | * close all outfd. Called when there are no more threads | |
467 | * running (after joining on the threads), no need to protect | |
468 | * list iteration with mutex. | |
469 | */ | |
470 | cds_list_for_each_entry_safe(iter, tmp, | |
471 | &consumer_data.stream_list.head, list) { | |
472 | consumer_del_stream(iter); | |
473 | } | |
474 | cds_list_for_each_entry_safe(citer, ctmp, | |
475 | &consumer_data.channel_list.head, list) { | |
476 | consumer_del_channel(citer); | |
477 | } | |
478 | } | |
479 | ||
480 | /* | |
481 | * Called from signal handler. | |
482 | */ | |
483 | void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx) | |
484 | { | |
485 | int ret; | |
486 | consumer_quit = 1; | |
487 | ret = write(ctx->consumer_should_quit[1], "4", 1); | |
488 | if (ret < 0) { | |
489 | perror("write consumer quit"); | |
490 | } | |
491 | } | |
492 | ||
493 | void lttng_consumer_sync_trace_file( | |
494 | struct lttng_consumer_stream *stream, off_t orig_offset) | |
495 | { | |
496 | int outfd = stream->out_fd; | |
497 | ||
498 | /* | |
499 | * This does a blocking write-and-wait on any page that belongs to the | |
500 | * subbuffer prior to the one we just wrote. | |
501 | * Don't care about error values, as these are just hints and ways to | |
502 | * limit the amount of page cache used. | |
503 | */ | |
504 | if (orig_offset < stream->chan->max_sb_size) { | |
505 | return; | |
506 | } | |
507 | sync_file_range(outfd, orig_offset - stream->chan->max_sb_size, | |
508 | stream->chan->max_sb_size, | |
509 | SYNC_FILE_RANGE_WAIT_BEFORE | |
510 | | SYNC_FILE_RANGE_WRITE | |
511 | | SYNC_FILE_RANGE_WAIT_AFTER); | |
512 | /* | |
513 | * Give hints to the kernel about how we access the file: | |
514 | * POSIX_FADV_DONTNEED : we won't re-access data in a near future after | |
515 | * we write it. | |
516 | * | |
517 | * We need to call fadvise again after the file grows because the | |
518 | * kernel does not seem to apply fadvise to non-existing parts of the | |
519 | * file. | |
520 | * | |
521 | * Call fadvise _after_ having waited for the page writeback to | |
522 | * complete because the dirty page writeback semantic is not well | |
523 | * defined. So it can be expected to lead to lower throughput in | |
524 | * streaming. | |
525 | */ | |
526 | posix_fadvise(outfd, orig_offset - stream->chan->max_sb_size, | |
527 | stream->chan->max_sb_size, POSIX_FADV_DONTNEED); | |
528 | } | |
529 | ||
530 | /* | |
531 | * Initialise the necessary environnement : | |
532 | * - create a new context | |
533 | * - create the poll_pipe | |
534 | * - create the should_quit pipe (for signal handler) | |
535 | * - create the thread pipe (for splice) | |
536 | * | |
537 | * Takes a function pointer as argument, this function is called when data is | |
538 | * available on a buffer. This function is responsible to do the | |
539 | * kernctl_get_next_subbuf, read the data with mmap or splice depending on the | |
540 | * buffer configuration and then kernctl_put_next_subbuf at the end. | |
541 | * | |
542 | * Returns a pointer to the new context or NULL on error. | |
543 | */ | |
544 | struct lttng_consumer_local_data *lttng_consumer_create( | |
545 | enum lttng_consumer_type type, | |
546 | int (*buffer_ready)(struct lttng_consumer_stream *stream), | |
547 | int (*recv_channel)(struct lttng_consumer_channel *channel), | |
548 | int (*recv_stream)(struct lttng_consumer_stream *stream), | |
549 | int (*update_stream)(int stream_key, uint32_t state)) | |
550 | { | |
551 | int ret, i; | |
552 | struct lttng_consumer_local_data *ctx; | |
553 | ||
554 | assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN || | |
555 | consumer_data.type == type); | |
556 | consumer_data.type = type; | |
557 | ||
558 | ctx = malloc(sizeof(struct lttng_consumer_local_data)); | |
559 | if (ctx == NULL) { | |
560 | perror("allocating context"); | |
561 | goto error; | |
562 | } | |
563 | ||
564 | ctx->consumer_error_socket = -1; | |
565 | /* assign the callbacks */ | |
566 | ctx->on_buffer_ready = buffer_ready; | |
567 | ctx->on_recv_channel = recv_channel; | |
568 | ctx->on_recv_stream = recv_stream; | |
569 | ctx->on_update_stream = update_stream; | |
570 | ||
571 | ret = pipe(ctx->consumer_poll_pipe); | |
572 | if (ret < 0) { | |
573 | perror("Error creating poll pipe"); | |
574 | goto error_poll_pipe; | |
575 | } | |
576 | ||
577 | ret = pipe(ctx->consumer_should_quit); | |
578 | if (ret < 0) { | |
579 | perror("Error creating recv pipe"); | |
580 | goto error_quit_pipe; | |
581 | } | |
582 | ||
583 | ret = pipe(ctx->consumer_thread_pipe); | |
584 | if (ret < 0) { | |
585 | perror("Error creating thread pipe"); | |
586 | goto error_thread_pipe; | |
587 | } | |
588 | ||
589 | return ctx; | |
590 | ||
591 | ||
592 | error_thread_pipe: | |
593 | for (i = 0; i < 2; i++) { | |
594 | int err; | |
595 | ||
596 | err = close(ctx->consumer_should_quit[i]); | |
597 | assert(!err); | |
598 | } | |
599 | error_quit_pipe: | |
600 | for (i = 0; i < 2; i++) { | |
601 | int err; | |
602 | ||
603 | err = close(ctx->consumer_poll_pipe[i]); | |
604 | assert(!err); | |
605 | } | |
606 | error_poll_pipe: | |
607 | free(ctx); | |
608 | error: | |
609 | return NULL; | |
610 | } | |
611 | ||
612 | /* | |
613 | * Close all fds associated with the instance and free the context. | |
614 | */ | |
615 | void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx) | |
616 | { | |
617 | close(ctx->consumer_error_socket); | |
618 | close(ctx->consumer_thread_pipe[0]); | |
619 | close(ctx->consumer_thread_pipe[1]); | |
620 | close(ctx->consumer_poll_pipe[0]); | |
621 | close(ctx->consumer_poll_pipe[1]); | |
622 | close(ctx->consumer_should_quit[0]); | |
623 | close(ctx->consumer_should_quit[1]); | |
624 | unlink(ctx->consumer_command_sock_path); | |
625 | free(ctx); | |
626 | } | |
627 | ||
628 | /* | |
629 | * Mmap the ring buffer, read it and write the data to the tracefile. | |
630 | * | |
631 | * Returns the number of bytes written | |
632 | */ | |
633 | int lttng_consumer_on_read_subbuffer_mmap( | |
634 | struct lttng_consumer_local_data *ctx, | |
635 | struct lttng_consumer_stream *stream, unsigned long len) | |
636 | { | |
637 | switch (consumer_data.type) { | |
638 | case LTTNG_CONSUMER_KERNEL: | |
639 | return lttng_kconsumer_on_read_subbuffer_mmap(ctx, stream, len); | |
640 | case LTTNG_CONSUMER_UST: | |
641 | return lttng_ustconsumer_on_read_subbuffer_mmap(ctx, stream, len); | |
642 | default: | |
643 | ERR("Unknown consumer_data type"); | |
644 | assert(0); | |
645 | } | |
646 | } | |
647 | ||
648 | /* | |
649 | * Splice the data from the ring buffer to the tracefile. | |
650 | * | |
651 | * Returns the number of bytes spliced. | |
652 | */ | |
653 | int lttng_consumer_on_read_subbuffer_splice( | |
654 | struct lttng_consumer_local_data *ctx, | |
655 | struct lttng_consumer_stream *stream, unsigned long len) | |
656 | { | |
657 | switch (consumer_data.type) { | |
658 | case LTTNG_CONSUMER_KERNEL: | |
659 | return lttng_kconsumer_on_read_subbuffer_splice(ctx, stream, len); | |
660 | case LTTNG_CONSUMER_UST: | |
661 | return -ENOSYS; | |
662 | default: | |
663 | ERR("Unknown consumer_data type"); | |
664 | assert(0); | |
665 | return -ENOSYS; | |
666 | } | |
667 | ||
668 | } | |
669 | ||
670 | /* | |
671 | * Take a snapshot for a specific fd | |
672 | * | |
673 | * Returns 0 on success, < 0 on error | |
674 | */ | |
675 | int lttng_consumer_take_snapshot(struct lttng_consumer_local_data *ctx, | |
676 | struct lttng_consumer_stream *stream) | |
677 | { | |
678 | switch (consumer_data.type) { | |
679 | case LTTNG_CONSUMER_KERNEL: | |
680 | return lttng_kconsumer_take_snapshot(ctx, stream); | |
681 | case LTTNG_CONSUMER_UST: | |
682 | return lttng_ustconsumer_take_snapshot(ctx, stream); | |
683 | default: | |
684 | ERR("Unknown consumer_data type"); | |
685 | assert(0); | |
686 | return -ENOSYS; | |
687 | } | |
688 | ||
689 | } | |
690 | ||
691 | /* | |
692 | * Get the produced position | |
693 | * | |
694 | * Returns 0 on success, < 0 on error | |
695 | */ | |
696 | int lttng_consumer_get_produced_snapshot( | |
697 | struct lttng_consumer_local_data *ctx, | |
698 | struct lttng_consumer_stream *stream, | |
699 | unsigned long *pos) | |
700 | { | |
701 | switch (consumer_data.type) { | |
702 | case LTTNG_CONSUMER_KERNEL: | |
703 | return lttng_kconsumer_get_produced_snapshot(ctx, stream, pos); | |
704 | case LTTNG_CONSUMER_UST: | |
705 | return lttng_ustconsumer_get_produced_snapshot(ctx, stream, pos); | |
706 | default: | |
707 | ERR("Unknown consumer_data type"); | |
708 | assert(0); | |
709 | return -ENOSYS; | |
710 | } | |
711 | } | |
712 | ||
713 | int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, | |
714 | int sock, struct pollfd *consumer_sockpoll) | |
715 | { | |
716 | switch (consumer_data.type) { | |
717 | case LTTNG_CONSUMER_KERNEL: | |
718 | return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
719 | case LTTNG_CONSUMER_UST: | |
720 | return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
721 | default: | |
722 | ERR("Unknown consumer_data type"); | |
723 | assert(0); | |
724 | return -ENOSYS; | |
725 | } | |
726 | } | |
727 | ||
728 | /* | |
729 | * This thread polls the fds in the ltt_fd_list to consume the data and write | |
730 | * it to tracefile if necessary. | |
731 | */ | |
732 | void *lttng_consumer_thread_poll_fds(void *data) | |
733 | { | |
734 | int num_rdy, num_hup, high_prio, ret, i; | |
735 | struct pollfd *pollfd = NULL; | |
736 | /* local view of the streams */ | |
737 | struct lttng_consumer_stream **local_stream = NULL; | |
738 | /* local view of consumer_data.fds_count */ | |
739 | int nb_fd = 0; | |
740 | char tmp; | |
741 | int tmp2; | |
742 | struct lttng_consumer_local_data *ctx = data; | |
743 | ||
744 | local_stream = malloc(sizeof(struct lttng_consumer_stream)); | |
745 | ||
746 | while (1) { | |
747 | high_prio = 0; | |
748 | num_hup = 0; | |
749 | ||
750 | /* | |
751 | * the ltt_fd_list has been updated, we need to update our | |
752 | * local array as well | |
753 | */ | |
754 | pthread_mutex_lock(&consumer_data.lock); | |
755 | if (consumer_data.need_update) { | |
756 | if (pollfd != NULL) { | |
757 | free(pollfd); | |
758 | pollfd = NULL; | |
759 | } | |
760 | if (local_stream != NULL) { | |
761 | free(local_stream); | |
762 | local_stream = NULL; | |
763 | } | |
764 | ||
765 | /* allocate for all fds + 1 for the consumer_poll_pipe */ | |
766 | pollfd = malloc((consumer_data.stream_count + 1) * sizeof(struct pollfd)); | |
767 | if (pollfd == NULL) { | |
768 | perror("pollfd malloc"); | |
769 | pthread_mutex_unlock(&consumer_data.lock); | |
770 | goto end; | |
771 | } | |
772 | ||
773 | /* allocate for all fds + 1 for the consumer_poll_pipe */ | |
774 | local_stream = malloc((consumer_data.stream_count + 1) * | |
775 | sizeof(struct lttng_consumer_stream)); | |
776 | if (local_stream == NULL) { | |
777 | perror("local_stream malloc"); | |
778 | pthread_mutex_unlock(&consumer_data.lock); | |
779 | goto end; | |
780 | } | |
781 | ret = consumer_update_poll_array(ctx, &pollfd, local_stream); | |
782 | if (ret < 0) { | |
783 | ERR("Error in allocating pollfd or local_outfds"); | |
784 | lttng_consumer_send_error(ctx, CONSUMERD_POLL_ERROR); | |
785 | pthread_mutex_unlock(&consumer_data.lock); | |
786 | goto end; | |
787 | } | |
788 | nb_fd = ret; | |
789 | consumer_data.need_update = 0; | |
790 | } | |
791 | pthread_mutex_unlock(&consumer_data.lock); | |
792 | ||
793 | /* poll on the array of fds */ | |
794 | DBG("polling on %d fd", nb_fd + 1); | |
795 | num_rdy = poll(pollfd, nb_fd + 1, consumer_poll_timeout); | |
796 | DBG("poll num_rdy : %d", num_rdy); | |
797 | if (num_rdy == -1) { | |
798 | perror("Poll error"); | |
799 | lttng_consumer_send_error(ctx, CONSUMERD_POLL_ERROR); | |
800 | goto end; | |
801 | } else if (num_rdy == 0) { | |
802 | DBG("Polling thread timed out"); | |
803 | goto end; | |
804 | } | |
805 | ||
806 | /* No FDs and consumer_quit, kconsumer_cleanup the thread */ | |
807 | if (nb_fd == 0 && consumer_quit == 1) { | |
808 | goto end; | |
809 | } | |
810 | ||
811 | /* | |
812 | * If the consumer_poll_pipe triggered poll go | |
813 | * directly to the beginning of the loop to update the | |
814 | * array. We want to prioritize array update over | |
815 | * low-priority reads. | |
816 | */ | |
817 | if (pollfd[nb_fd].revents == POLLIN) { | |
818 | DBG("consumer_poll_pipe wake up"); | |
819 | tmp2 = read(ctx->consumer_poll_pipe[0], &tmp, 1); | |
820 | if (tmp2 < 0) { | |
821 | perror("read kconsumer poll"); | |
822 | } | |
823 | continue; | |
824 | } | |
825 | ||
826 | /* Take care of high priority channels first. */ | |
827 | for (i = 0; i < nb_fd; i++) { | |
828 | switch(pollfd[i].revents) { | |
829 | case POLLERR: | |
830 | ERR("Error returned in polling fd %d.", pollfd[i].fd); | |
831 | consumer_del_stream(local_stream[i]); | |
832 | num_hup++; | |
833 | break; | |
834 | case POLLHUP: | |
835 | DBG("Polling fd %d tells it has hung up.", pollfd[i].fd); | |
836 | consumer_del_stream(local_stream[i]); | |
837 | num_hup++; | |
838 | break; | |
839 | case POLLNVAL: | |
840 | ERR("Polling fd %d tells fd is not open.", pollfd[i].fd); | |
841 | consumer_del_stream(local_stream[i]); | |
842 | num_hup++; | |
843 | break; | |
844 | case POLLPRI: | |
845 | DBG("Urgent read on fd %d", pollfd[i].fd); | |
846 | high_prio = 1; | |
847 | ret = ctx->on_buffer_ready(local_stream[i]); | |
848 | /* it's ok to have an unavailable sub-buffer */ | |
849 | if (ret == EAGAIN) { | |
850 | ret = 0; | |
851 | } | |
852 | break; | |
853 | } | |
854 | } | |
855 | ||
856 | /* If every buffer FD has hung up, we end the read loop here */ | |
857 | if (nb_fd > 0 && num_hup == nb_fd) { | |
858 | DBG("every buffer FD has hung up\n"); | |
859 | if (consumer_quit == 1) { | |
860 | goto end; | |
861 | } | |
862 | continue; | |
863 | } | |
864 | ||
865 | /* Take care of low priority channels. */ | |
866 | if (high_prio == 0) { | |
867 | for (i = 0; i < nb_fd; i++) { | |
868 | if (pollfd[i].revents == POLLIN) { | |
869 | DBG("Normal read on fd %d", pollfd[i].fd); | |
870 | ret = ctx->on_buffer_ready(local_stream[i]); | |
871 | /* it's ok to have an unavailable subbuffer */ | |
872 | if (ret == EAGAIN) { | |
873 | ret = 0; | |
874 | } | |
875 | } | |
876 | } | |
877 | } | |
878 | } | |
879 | end: | |
880 | DBG("polling thread exiting"); | |
881 | if (pollfd != NULL) { | |
882 | free(pollfd); | |
883 | pollfd = NULL; | |
884 | } | |
885 | if (local_stream != NULL) { | |
886 | free(local_stream); | |
887 | local_stream = NULL; | |
888 | } | |
889 | return NULL; | |
890 | } | |
891 | ||
892 | /* | |
893 | * This thread listens on the consumerd socket and receives the file | |
894 | * descriptors from the session daemon. | |
895 | */ | |
896 | void *lttng_consumer_thread_receive_fds(void *data) | |
897 | { | |
898 | int sock, client_socket, ret; | |
899 | /* | |
900 | * structure to poll for incoming data on communication socket avoids | |
901 | * making blocking sockets. | |
902 | */ | |
903 | struct pollfd consumer_sockpoll[2]; | |
904 | struct lttng_consumer_local_data *ctx = data; | |
905 | ||
906 | DBG("Creating command socket %s", ctx->consumer_command_sock_path); | |
907 | unlink(ctx->consumer_command_sock_path); | |
908 | client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path); | |
909 | if (client_socket < 0) { | |
910 | ERR("Cannot create command socket"); | |
911 | goto end; | |
912 | } | |
913 | ||
914 | ret = lttcomm_listen_unix_sock(client_socket); | |
915 | if (ret < 0) { | |
916 | goto end; | |
917 | } | |
918 | ||
32258573 | 919 | DBG("Sending ready command to lttng-sessiond"); |
3bd1e081 MD |
920 | ret = lttng_consumer_send_error(ctx, CONSUMERD_COMMAND_SOCK_READY); |
921 | /* return < 0 on error, but == 0 is not fatal */ | |
922 | if (ret < 0) { | |
32258573 | 923 | ERR("Error sending ready command to lttng-sessiond"); |
3bd1e081 MD |
924 | goto end; |
925 | } | |
926 | ||
927 | ret = fcntl(client_socket, F_SETFL, O_NONBLOCK); | |
928 | if (ret < 0) { | |
929 | perror("fcntl O_NONBLOCK"); | |
930 | goto end; | |
931 | } | |
932 | ||
933 | /* prepare the FDs to poll : to client socket and the should_quit pipe */ | |
934 | consumer_sockpoll[0].fd = ctx->consumer_should_quit[0]; | |
935 | consumer_sockpoll[0].events = POLLIN | POLLPRI; | |
936 | consumer_sockpoll[1].fd = client_socket; | |
937 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
938 | ||
939 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
940 | goto end; | |
941 | } | |
942 | DBG("Connection on client_socket"); | |
943 | ||
944 | /* Blocking call, waiting for transmission */ | |
945 | sock = lttcomm_accept_unix_sock(client_socket); | |
946 | if (sock <= 0) { | |
947 | WARN("On accept"); | |
948 | goto end; | |
949 | } | |
950 | ret = fcntl(sock, F_SETFL, O_NONBLOCK); | |
951 | if (ret < 0) { | |
952 | perror("fcntl O_NONBLOCK"); | |
953 | goto end; | |
954 | } | |
955 | ||
956 | /* update the polling structure to poll on the established socket */ | |
957 | consumer_sockpoll[1].fd = sock; | |
958 | consumer_sockpoll[1].events = POLLIN | POLLPRI; | |
959 | ||
960 | while (1) { | |
961 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
962 | goto end; | |
963 | } | |
964 | DBG("Incoming command on sock"); | |
965 | ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll); | |
966 | if (ret == -ENOENT) { | |
967 | DBG("Received STOP command"); | |
968 | goto end; | |
969 | } | |
970 | if (ret < 0) { | |
971 | ERR("Communication interrupted on command socket"); | |
972 | goto end; | |
973 | } | |
974 | if (consumer_quit) { | |
975 | DBG("consumer_thread_receive_fds received quit from signal"); | |
976 | goto end; | |
977 | } | |
978 | DBG("received fds on sock"); | |
979 | } | |
980 | end: | |
981 | DBG("consumer_thread_receive_fds exiting"); | |
982 | ||
983 | /* | |
984 | * when all fds have hung up, the polling thread | |
985 | * can exit cleanly | |
986 | */ | |
987 | consumer_quit = 1; | |
988 | ||
989 | /* | |
990 | * 2s of grace period, if no polling events occur during | |
991 | * this period, the polling thread will exit even if there | |
992 | * are still open FDs (should not happen, but safety mechanism). | |
993 | */ | |
994 | consumer_poll_timeout = LTTNG_CONSUMER_POLL_TIMEOUT; | |
995 | ||
996 | /* wake up the polling thread */ | |
997 | ret = write(ctx->consumer_poll_pipe[1], "4", 1); | |
998 | if (ret < 0) { | |
999 | perror("poll pipe write"); | |
1000 | } | |
1001 | return NULL; | |
1002 | } |