Commit | Line | Data |
---|---|---|
b8aa1682 JD |
1 | /* |
2 | * Copyright (C) 2012 - Julien Desfossez <jdesfossez@efficios.com> | |
3 | * David Goulet <dgoulet@efficios.com> | |
4 | * | |
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. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
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. | |
17 | */ | |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <getopt.h> | |
21 | #include <grp.h> | |
22 | #include <limits.h> | |
23 | #include <pthread.h> | |
24 | #include <signal.h> | |
25 | #include <stdio.h> | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
28 | #include <sys/mman.h> | |
29 | #include <sys/mount.h> | |
30 | #include <sys/resource.h> | |
31 | #include <sys/socket.h> | |
32 | #include <sys/stat.h> | |
33 | #include <sys/types.h> | |
34 | #include <sys/wait.h> | |
173af62f | 35 | #include <inttypes.h> |
b8aa1682 JD |
36 | #include <urcu/futex.h> |
37 | #include <urcu/uatomic.h> | |
38 | #include <unistd.h> | |
39 | #include <fcntl.h> | |
40 | #include <config.h> | |
41 | ||
42 | #include <lttng/lttng.h> | |
43 | #include <common/common.h> | |
44 | #include <common/compat/poll.h> | |
45 | #include <common/compat/socket.h> | |
46 | #include <common/defaults.h> | |
47 | #include <common/futex.h> | |
48 | #include <common/sessiond-comm/sessiond-comm.h> | |
49 | #include <common/sessiond-comm/inet.h> | |
50 | #include <common/hashtable/hashtable.h> | |
51 | #include <common/sessiond-comm/relayd.h> | |
52 | #include <common/uri.h> | |
a02de639 | 53 | #include <common/utils.h> |
b8aa1682 JD |
54 | |
55 | #include "lttng-relayd.h" | |
56 | ||
57 | /* command line options */ | |
58 | static int opt_daemon; | |
59 | static char *opt_output_path; | |
095a4ae5 MD |
60 | static struct lttng_uri *control_uri; |
61 | static struct lttng_uri *data_uri; | |
b8aa1682 JD |
62 | |
63 | const char *progname; | |
64 | static int is_root; /* Set to 1 if the daemon is running as root */ | |
65 | ||
66 | /* | |
67 | * Quit pipe for all threads. This permits a single cancellation point | |
68 | * for all threads when receiving an event on the pipe. | |
69 | */ | |
70 | static int thread_quit_pipe[2] = { -1, -1 }; | |
71 | ||
72 | /* | |
73 | * This pipe is used to inform the worker thread that a command is queued and | |
74 | * ready to be processed. | |
75 | */ | |
76 | static int relay_cmd_pipe[2] = { -1, -1 }; | |
77 | ||
26c9d55e | 78 | /* Shared between threads */ |
b8aa1682 JD |
79 | static int dispatch_thread_exit; |
80 | ||
81 | static pthread_t listener_thread; | |
82 | static pthread_t dispatcher_thread; | |
83 | static pthread_t worker_thread; | |
84 | ||
095a4ae5 MD |
85 | static uint64_t last_relay_stream_id; |
86 | static uint64_t last_relay_session_id; | |
b8aa1682 JD |
87 | |
88 | /* | |
89 | * Relay command queue. | |
90 | * | |
91 | * The relay_thread_listener and relay_thread_dispatcher communicate with this | |
92 | * queue. | |
93 | */ | |
94 | static struct relay_cmd_queue relay_cmd_queue; | |
95 | ||
96 | /* buffer allocated at startup, used to store the trace data */ | |
095a4ae5 MD |
97 | static char *data_buffer; |
98 | static unsigned int data_buffer_size; | |
b8aa1682 JD |
99 | |
100 | /* | |
101 | * usage function on stderr | |
102 | */ | |
103 | static | |
104 | void usage(void) | |
105 | { | |
106 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); | |
107 | fprintf(stderr, " -h, --help Display this usage.\n"); | |
108 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); | |
109 | fprintf(stderr, " -C, --control-port Control port listening (URI)\n"); | |
110 | fprintf(stderr, " -D, --data-port Data port listening (URI)\n"); | |
25672d02 | 111 | fprintf(stderr, " -o, --output Output path for traces (PATH)\n"); |
b8aa1682 JD |
112 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); |
113 | } | |
114 | ||
115 | static | |
116 | int parse_args(int argc, char **argv) | |
117 | { | |
118 | int c; | |
119 | int ret = 0; | |
120 | char *default_address; | |
121 | ||
122 | static struct option long_options[] = { | |
e3678fd8 MD |
123 | { "control-port", 1, 0, 'C', }, |
124 | { "data-port", 1, 0, 'D', }, | |
125 | { "daemonize", 0, 0, 'd', }, | |
126 | { "help", 0, 0, 'h', }, | |
127 | { "output", 1, 0, 'o', }, | |
128 | { "verbose", 0, 0, 'v', }, | |
095a4ae5 | 129 | { NULL, 0, 0, 0, }, |
b8aa1682 JD |
130 | }; |
131 | ||
132 | while (1) { | |
133 | int option_index = 0; | |
134 | c = getopt_long(argc, argv, "dhv" "C:D:o:", | |
135 | long_options, &option_index); | |
136 | if (c == -1) { | |
137 | break; | |
138 | } | |
139 | ||
140 | switch (c) { | |
141 | case 0: | |
142 | fprintf(stderr, "option %s", long_options[option_index].name); | |
143 | if (optarg) { | |
144 | fprintf(stderr, " with arg %s\n", optarg); | |
145 | } | |
146 | break; | |
147 | case 'C': | |
148 | ret = uri_parse(optarg, &control_uri); | |
149 | if (ret < 0) { | |
150 | ERR("Invalid control URI specified"); | |
151 | goto exit; | |
152 | } | |
153 | if (control_uri->port == 0) { | |
154 | control_uri->port = DEFAULT_NETWORK_CONTROL_PORT; | |
155 | } | |
156 | break; | |
157 | case 'D': | |
158 | ret = uri_parse(optarg, &data_uri); | |
159 | if (ret < 0) { | |
160 | ERR("Invalid data URI specified"); | |
161 | goto exit; | |
162 | } | |
163 | if (data_uri->port == 0) { | |
164 | data_uri->port = DEFAULT_NETWORK_DATA_PORT; | |
165 | } | |
166 | break; | |
167 | case 'd': | |
168 | opt_daemon = 1; | |
169 | break; | |
170 | case 'h': | |
171 | usage(); | |
172 | exit(EXIT_FAILURE); | |
173 | case 'o': | |
174 | ret = asprintf(&opt_output_path, "%s", optarg); | |
175 | if (ret < 0) { | |
176 | PERROR("asprintf opt_output_path"); | |
177 | goto exit; | |
178 | } | |
179 | break; | |
180 | case 'v': | |
181 | /* Verbose level can increase using multiple -v */ | |
182 | lttng_opt_verbose += 1; | |
183 | break; | |
184 | default: | |
185 | /* Unknown option or other error. | |
186 | * Error is printed by getopt, just return */ | |
187 | ret = -1; | |
188 | goto exit; | |
189 | } | |
190 | } | |
191 | ||
192 | /* assign default values */ | |
193 | if (control_uri == NULL) { | |
194 | ret = asprintf(&default_address, "tcp://0.0.0.0:%d", | |
195 | DEFAULT_NETWORK_CONTROL_PORT); | |
196 | if (ret < 0) { | |
197 | PERROR("asprintf default data address"); | |
198 | goto exit; | |
199 | } | |
200 | ||
201 | ret = uri_parse(default_address, &control_uri); | |
202 | free(default_address); | |
203 | if (ret < 0) { | |
204 | ERR("Invalid control URI specified"); | |
205 | goto exit; | |
206 | } | |
207 | } | |
208 | if (data_uri == NULL) { | |
209 | ret = asprintf(&default_address, "tcp://0.0.0.0:%d", | |
210 | DEFAULT_NETWORK_DATA_PORT); | |
211 | if (ret < 0) { | |
212 | PERROR("asprintf default data address"); | |
213 | goto exit; | |
214 | } | |
215 | ||
216 | ret = uri_parse(default_address, &data_uri); | |
217 | free(default_address); | |
218 | if (ret < 0) { | |
219 | ERR("Invalid data URI specified"); | |
220 | goto exit; | |
221 | } | |
222 | } | |
223 | ||
224 | exit: | |
225 | return ret; | |
226 | } | |
227 | ||
228 | /* | |
229 | * Cleanup the daemon | |
230 | */ | |
231 | static | |
232 | void cleanup(void) | |
233 | { | |
b8aa1682 JD |
234 | DBG("Cleaning up"); |
235 | ||
095a4ae5 MD |
236 | /* free the dynamically allocated opt_output_path */ |
237 | free(opt_output_path); | |
238 | ||
a02de639 CB |
239 | /* Close thread quit pipes */ |
240 | utils_close_pipe(thread_quit_pipe); | |
241 | ||
710c1f73 DG |
242 | uri_free(control_uri); |
243 | uri_free(data_uri); | |
b8aa1682 JD |
244 | } |
245 | ||
246 | /* | |
247 | * Write to writable pipe used to notify a thread. | |
248 | */ | |
249 | static | |
250 | int notify_thread_pipe(int wpipe) | |
251 | { | |
252 | int ret; | |
253 | ||
6f94560a MD |
254 | do { |
255 | ret = write(wpipe, "!", 1); | |
256 | } while (ret < 0 && errno == EINTR); | |
4cec016f | 257 | if (ret < 0 || ret != 1) { |
b8aa1682 JD |
258 | PERROR("write poll pipe"); |
259 | } | |
260 | ||
261 | return ret; | |
262 | } | |
263 | ||
264 | /* | |
265 | * Stop all threads by closing the thread quit pipe. | |
266 | */ | |
267 | static | |
268 | void stop_threads(void) | |
269 | { | |
270 | int ret; | |
271 | ||
272 | /* Stopping all threads */ | |
273 | DBG("Terminating all threads"); | |
274 | ret = notify_thread_pipe(thread_quit_pipe[1]); | |
275 | if (ret < 0) { | |
276 | ERR("write error on thread quit pipe"); | |
277 | } | |
278 | ||
279 | /* Dispatch thread */ | |
26c9d55e | 280 | CMM_STORE_SHARED(dispatch_thread_exit, 1); |
b8aa1682 JD |
281 | futex_nto1_wake(&relay_cmd_queue.futex); |
282 | } | |
283 | ||
284 | /* | |
285 | * Signal handler for the daemon | |
286 | * | |
287 | * Simply stop all worker threads, leaving main() return gracefully after | |
288 | * joining all threads and calling cleanup(). | |
289 | */ | |
290 | static | |
291 | void sighandler(int sig) | |
292 | { | |
293 | switch (sig) { | |
294 | case SIGPIPE: | |
295 | DBG("SIGPIPE caught"); | |
296 | return; | |
297 | case SIGINT: | |
298 | DBG("SIGINT caught"); | |
299 | stop_threads(); | |
300 | break; | |
301 | case SIGTERM: | |
302 | DBG("SIGTERM caught"); | |
303 | stop_threads(); | |
304 | break; | |
305 | default: | |
306 | break; | |
307 | } | |
308 | } | |
309 | ||
310 | /* | |
311 | * Setup signal handler for : | |
312 | * SIGINT, SIGTERM, SIGPIPE | |
313 | */ | |
314 | static | |
315 | int set_signal_handler(void) | |
316 | { | |
317 | int ret = 0; | |
318 | struct sigaction sa; | |
319 | sigset_t sigset; | |
320 | ||
321 | if ((ret = sigemptyset(&sigset)) < 0) { | |
322 | PERROR("sigemptyset"); | |
323 | return ret; | |
324 | } | |
325 | ||
326 | sa.sa_handler = sighandler; | |
327 | sa.sa_mask = sigset; | |
328 | sa.sa_flags = 0; | |
329 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
330 | PERROR("sigaction"); | |
331 | return ret; | |
332 | } | |
333 | ||
334 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { | |
335 | PERROR("sigaction"); | |
336 | return ret; | |
337 | } | |
338 | ||
339 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { | |
340 | PERROR("sigaction"); | |
341 | return ret; | |
342 | } | |
343 | ||
344 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); | |
345 | ||
346 | return ret; | |
347 | } | |
348 | ||
349 | /* | |
350 | * Init thread quit pipe. | |
351 | * | |
352 | * Return -1 on error or 0 if all pipes are created. | |
353 | */ | |
354 | static | |
355 | int init_thread_quit_pipe(void) | |
356 | { | |
a02de639 | 357 | int ret; |
b8aa1682 | 358 | |
a02de639 | 359 | ret = utils_create_pipe_cloexec(thread_quit_pipe); |
b8aa1682 | 360 | |
b8aa1682 JD |
361 | return ret; |
362 | } | |
363 | ||
364 | /* | |
365 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
366 | */ | |
367 | static | |
368 | int create_thread_poll_set(struct lttng_poll_event *events, int size) | |
369 | { | |
370 | int ret; | |
371 | ||
372 | if (events == NULL || size == 0) { | |
373 | ret = -1; | |
374 | goto error; | |
375 | } | |
376 | ||
377 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
378 | if (ret < 0) { | |
379 | goto error; | |
380 | } | |
381 | ||
382 | /* Add quit pipe */ | |
383 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
384 | if (ret < 0) { | |
385 | goto error; | |
386 | } | |
387 | ||
388 | return 0; | |
389 | ||
390 | error: | |
391 | return ret; | |
392 | } | |
393 | ||
394 | /* | |
395 | * Check if the thread quit pipe was triggered. | |
396 | * | |
397 | * Return 1 if it was triggered else 0; | |
398 | */ | |
399 | static | |
400 | int check_thread_quit_pipe(int fd, uint32_t events) | |
401 | { | |
402 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
403 | return 1; | |
404 | } | |
405 | ||
406 | return 0; | |
407 | } | |
408 | ||
409 | /* | |
410 | * Create and init socket from uri. | |
411 | */ | |
412 | static | |
413 | struct lttcomm_sock *relay_init_sock(struct lttng_uri *uri) | |
414 | { | |
415 | int ret; | |
416 | struct lttcomm_sock *sock = NULL; | |
417 | ||
418 | sock = lttcomm_alloc_sock_from_uri(uri); | |
419 | if (sock == NULL) { | |
420 | ERR("Allocating socket"); | |
421 | goto error; | |
422 | } | |
423 | ||
424 | ret = lttcomm_create_sock(sock); | |
425 | if (ret < 0) { | |
426 | goto error; | |
427 | } | |
428 | DBG("Listening on sock %d", sock->fd); | |
429 | ||
430 | ret = sock->ops->bind(sock); | |
431 | if (ret < 0) { | |
432 | goto error; | |
433 | } | |
434 | ||
435 | ret = sock->ops->listen(sock, -1); | |
436 | if (ret < 0) { | |
437 | goto error; | |
438 | ||
439 | } | |
440 | ||
441 | return sock; | |
442 | ||
443 | error: | |
444 | if (sock) { | |
445 | lttcomm_destroy_sock(sock); | |
446 | } | |
447 | return NULL; | |
448 | } | |
449 | ||
173af62f DG |
450 | /* |
451 | * Return nonzero if stream needs to be closed. | |
452 | */ | |
453 | static | |
454 | int close_stream_check(struct relay_stream *stream) | |
455 | { | |
456 | ||
457 | if (stream->close_flag && stream->prev_seq == stream->last_net_seq_num) { | |
f7079f67 DG |
458 | /* |
459 | * We are about to close the stream so set the data pending flag to 1 | |
460 | * which will make the end data pending command skip the stream which | |
461 | * is now closed and ready. Note that after proceeding to a file close, | |
462 | * the written file is ready for reading. | |
463 | */ | |
464 | stream->data_pending_check_done = 1; | |
173af62f DG |
465 | return 1; |
466 | } | |
467 | return 0; | |
468 | } | |
469 | ||
b8aa1682 JD |
470 | /* |
471 | * This thread manages the listening for new connections on the network | |
472 | */ | |
473 | static | |
474 | void *relay_thread_listener(void *data) | |
475 | { | |
095a4ae5 | 476 | int i, ret, pollfd, err = -1; |
b8aa1682 JD |
477 | int val = 1; |
478 | uint32_t revents, nb_fd; | |
479 | struct lttng_poll_event events; | |
480 | struct lttcomm_sock *control_sock, *data_sock; | |
481 | ||
b8aa1682 JD |
482 | DBG("[thread] Relay listener started"); |
483 | ||
484 | control_sock = relay_init_sock(control_uri); | |
485 | if (!control_sock) { | |
095a4ae5 | 486 | goto error_sock_control; |
b8aa1682 JD |
487 | } |
488 | ||
489 | data_sock = relay_init_sock(data_uri); | |
490 | if (!data_sock) { | |
095a4ae5 | 491 | goto error_sock_relay; |
b8aa1682 JD |
492 | } |
493 | ||
494 | /* | |
495 | * Pass 3 as size here for the thread quit pipe, control and data socket. | |
496 | */ | |
497 | ret = create_thread_poll_set(&events, 3); | |
498 | if (ret < 0) { | |
499 | goto error_create_poll; | |
500 | } | |
501 | ||
502 | /* Add the control socket */ | |
503 | ret = lttng_poll_add(&events, control_sock->fd, LPOLLIN | LPOLLRDHUP); | |
504 | if (ret < 0) { | |
505 | goto error_poll_add; | |
506 | } | |
507 | ||
508 | /* Add the data socket */ | |
509 | ret = lttng_poll_add(&events, data_sock->fd, LPOLLIN | LPOLLRDHUP); | |
510 | if (ret < 0) { | |
511 | goto error_poll_add; | |
512 | } | |
513 | ||
514 | while (1) { | |
515 | DBG("Listener accepting connections"); | |
516 | ||
b8aa1682 JD |
517 | restart: |
518 | ret = lttng_poll_wait(&events, -1); | |
519 | if (ret < 0) { | |
520 | /* | |
521 | * Restart interrupted system call. | |
522 | */ | |
523 | if (errno == EINTR) { | |
524 | goto restart; | |
525 | } | |
526 | goto error; | |
527 | } | |
528 | ||
0d9c5d77 DG |
529 | nb_fd = ret; |
530 | ||
b8aa1682 JD |
531 | DBG("Relay new connection received"); |
532 | for (i = 0; i < nb_fd; i++) { | |
533 | /* Fetch once the poll data */ | |
534 | revents = LTTNG_POLL_GETEV(&events, i); | |
535 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
536 | ||
537 | /* Thread quit pipe has been closed. Killing thread. */ | |
538 | ret = check_thread_quit_pipe(pollfd, revents); | |
539 | if (ret) { | |
095a4ae5 MD |
540 | err = 0; |
541 | goto exit; | |
b8aa1682 JD |
542 | } |
543 | ||
544 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
545 | ERR("socket poll error"); | |
546 | goto error; | |
547 | } else if (revents & LPOLLIN) { | |
4b7f17b2 MD |
548 | /* |
549 | * Get allocated in this thread, | |
550 | * enqueued to a global queue, dequeued | |
551 | * and freed in the worker thread. | |
552 | */ | |
553 | struct relay_command *relay_cmd; | |
554 | struct lttcomm_sock *newsock; | |
b8aa1682 JD |
555 | |
556 | relay_cmd = zmalloc(sizeof(struct relay_command)); | |
557 | if (relay_cmd == NULL) { | |
558 | PERROR("relay command zmalloc"); | |
559 | goto error; | |
560 | } | |
561 | ||
562 | if (pollfd == data_sock->fd) { | |
563 | newsock = data_sock->ops->accept(data_sock); | |
4b7f17b2 | 564 | if (!newsock) { |
b8aa1682 | 565 | PERROR("accepting data sock"); |
4b7f17b2 | 566 | free(relay_cmd); |
b8aa1682 JD |
567 | goto error; |
568 | } | |
569 | relay_cmd->type = RELAY_DATA; | |
570 | DBG("Relay data connection accepted, socket %d", newsock->fd); | |
4b7f17b2 MD |
571 | } else { |
572 | assert(pollfd == control_sock->fd); | |
b8aa1682 | 573 | newsock = control_sock->ops->accept(control_sock); |
4b7f17b2 | 574 | if (!newsock) { |
b8aa1682 | 575 | PERROR("accepting control sock"); |
4b7f17b2 | 576 | free(relay_cmd); |
b8aa1682 JD |
577 | goto error; |
578 | } | |
579 | relay_cmd->type = RELAY_CONTROL; | |
580 | DBG("Relay control connection accepted, socket %d", newsock->fd); | |
581 | } | |
582 | ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, | |
583 | &val, sizeof(int)); | |
584 | if (ret < 0) { | |
585 | PERROR("setsockopt inet"); | |
4b7f17b2 MD |
586 | lttcomm_destroy_sock(newsock); |
587 | free(relay_cmd); | |
b8aa1682 JD |
588 | goto error; |
589 | } | |
590 | relay_cmd->sock = newsock; | |
591 | /* | |
592 | * Lock free enqueue the request. | |
593 | */ | |
594 | cds_wfq_enqueue(&relay_cmd_queue.queue, &relay_cmd->node); | |
595 | ||
596 | /* | |
597 | * Wake the dispatch queue futex. Implicit memory | |
598 | * barrier with the exchange in cds_wfq_enqueue. | |
599 | */ | |
600 | futex_nto1_wake(&relay_cmd_queue.futex); | |
601 | } | |
602 | } | |
603 | } | |
604 | ||
095a4ae5 | 605 | exit: |
b8aa1682 JD |
606 | error: |
607 | error_poll_add: | |
608 | lttng_poll_clean(&events); | |
609 | error_create_poll: | |
095a4ae5 MD |
610 | if (data_sock->fd >= 0) { |
611 | ret = data_sock->ops->close(data_sock); | |
b8aa1682 JD |
612 | if (ret) { |
613 | PERROR("close"); | |
614 | } | |
b8aa1682 | 615 | } |
095a4ae5 MD |
616 | lttcomm_destroy_sock(data_sock); |
617 | error_sock_relay: | |
618 | if (control_sock->fd >= 0) { | |
619 | ret = control_sock->ops->close(control_sock); | |
b8aa1682 JD |
620 | if (ret) { |
621 | PERROR("close"); | |
622 | } | |
b8aa1682 | 623 | } |
095a4ae5 MD |
624 | lttcomm_destroy_sock(control_sock); |
625 | error_sock_control: | |
626 | if (err) { | |
627 | DBG("Thread exited with error"); | |
628 | } | |
b8aa1682 JD |
629 | DBG("Relay listener thread cleanup complete"); |
630 | stop_threads(); | |
b8aa1682 JD |
631 | return NULL; |
632 | } | |
633 | ||
634 | /* | |
635 | * This thread manages the dispatching of the requests to worker threads | |
636 | */ | |
637 | static | |
638 | void *relay_thread_dispatcher(void *data) | |
639 | { | |
640 | int ret; | |
641 | struct cds_wfq_node *node; | |
642 | struct relay_command *relay_cmd = NULL; | |
643 | ||
644 | DBG("[thread] Relay dispatcher started"); | |
645 | ||
26c9d55e | 646 | while (!CMM_LOAD_SHARED(dispatch_thread_exit)) { |
b8aa1682 JD |
647 | /* Atomically prepare the queue futex */ |
648 | futex_nto1_prepare(&relay_cmd_queue.futex); | |
649 | ||
650 | do { | |
651 | /* Dequeue commands */ | |
652 | node = cds_wfq_dequeue_blocking(&relay_cmd_queue.queue); | |
653 | if (node == NULL) { | |
654 | DBG("Woken up but nothing in the relay command queue"); | |
655 | /* Continue thread execution */ | |
656 | break; | |
657 | } | |
658 | ||
659 | relay_cmd = caa_container_of(node, struct relay_command, node); | |
660 | DBG("Dispatching request waiting on sock %d", relay_cmd->sock->fd); | |
661 | ||
662 | /* | |
663 | * Inform worker thread of the new request. This | |
664 | * call is blocking so we can be assured that the data will be read | |
665 | * at some point in time or wait to the end of the world :) | |
666 | */ | |
6f94560a MD |
667 | do { |
668 | ret = write(relay_cmd_pipe[1], relay_cmd, | |
669 | sizeof(struct relay_command)); | |
670 | } while (ret < 0 && errno == EINTR); | |
b8aa1682 | 671 | free(relay_cmd); |
4cec016f | 672 | if (ret < 0 || ret != sizeof(struct relay_command)) { |
b8aa1682 JD |
673 | PERROR("write cmd pipe"); |
674 | goto error; | |
675 | } | |
676 | } while (node != NULL); | |
677 | ||
678 | /* Futex wait on queue. Blocking call on futex() */ | |
679 | futex_nto1_wait(&relay_cmd_queue.futex); | |
680 | } | |
681 | ||
682 | error: | |
683 | DBG("Dispatch thread dying"); | |
684 | stop_threads(); | |
685 | return NULL; | |
686 | } | |
687 | ||
b8aa1682 JD |
688 | /* |
689 | * config_get_default_path | |
690 | * | |
691 | * Returns the HOME directory path. Caller MUST NOT free(3) the return pointer. | |
692 | */ | |
693 | static | |
694 | char *config_get_default_path(void) | |
695 | { | |
696 | return getenv("HOME"); | |
697 | } | |
698 | ||
b8aa1682 | 699 | static |
095a4ae5 | 700 | char *create_output_path_auto(char *path_name) |
b8aa1682 | 701 | { |
095a4ae5 | 702 | int ret; |
b8aa1682 | 703 | char *traces_path = NULL; |
095a4ae5 MD |
704 | char *alloc_path = NULL; |
705 | char *default_path; | |
b8aa1682 | 706 | |
095a4ae5 MD |
707 | default_path = config_get_default_path(); |
708 | if (default_path == NULL) { | |
709 | ERR("Home path not found.\n \ | |
710 | Please specify an output path using -o, --output PATH"); | |
711 | goto exit; | |
712 | } | |
713 | alloc_path = strdup(default_path); | |
714 | if (alloc_path == NULL) { | |
715 | PERROR("Path allocation"); | |
716 | goto exit; | |
717 | } | |
718 | ret = asprintf(&traces_path, "%s/" DEFAULT_TRACE_DIR_NAME | |
719 | "/%s", alloc_path, path_name); | |
720 | if (ret < 0) { | |
721 | PERROR("asprintf trace dir name"); | |
722 | goto exit; | |
b8aa1682 | 723 | } |
095a4ae5 | 724 | exit: |
b8aa1682 | 725 | free(alloc_path); |
095a4ae5 MD |
726 | return traces_path; |
727 | } | |
728 | ||
729 | static | |
730 | char *create_output_path_noauto(char *path_name) | |
731 | { | |
732 | int ret; | |
733 | char *traces_path = NULL; | |
734 | char *full_path; | |
b8aa1682 | 735 | |
834f3ec7 | 736 | full_path = utils_expand_path(opt_output_path); |
095a4ae5 MD |
737 | ret = asprintf(&traces_path, "%s/%s", full_path, path_name); |
738 | if (ret < 0) { | |
739 | PERROR("asprintf trace dir name"); | |
740 | goto exit; | |
741 | } | |
b8aa1682 | 742 | exit: |
095a4ae5 | 743 | free(full_path); |
b8aa1682 JD |
744 | return traces_path; |
745 | } | |
746 | ||
095a4ae5 MD |
747 | /* |
748 | * create_output_path: create the output trace directory | |
749 | */ | |
750 | static | |
751 | char *create_output_path(char *path_name) | |
752 | { | |
753 | if (opt_output_path == NULL) { | |
754 | return create_output_path_auto(path_name); | |
755 | } else { | |
756 | return create_output_path_noauto(path_name); | |
757 | } | |
758 | } | |
759 | ||
de91f48a DG |
760 | /* |
761 | * Get stream from stream id. | |
762 | * Need to be called with RCU read-side lock held. | |
763 | */ | |
764 | static | |
765 | struct relay_stream *relay_stream_from_stream_id(uint64_t stream_id, | |
766 | struct lttng_ht *streams_ht) | |
767 | { | |
768 | struct lttng_ht_node_ulong *node; | |
769 | struct lttng_ht_iter iter; | |
770 | struct relay_stream *ret; | |
771 | ||
772 | lttng_ht_lookup(streams_ht, | |
773 | (void *)((unsigned long) stream_id), | |
774 | &iter); | |
775 | node = lttng_ht_iter_get_node_ulong(&iter); | |
776 | if (node == NULL) { | |
777 | DBG("Relay stream %" PRIu64 " not found", stream_id); | |
778 | ret = NULL; | |
779 | goto end; | |
780 | } | |
781 | ||
782 | ret = caa_container_of(node, struct relay_stream, stream_n); | |
783 | ||
784 | end: | |
785 | return ret; | |
786 | } | |
787 | ||
9d1bbf21 MD |
788 | static |
789 | void deferred_free_stream(struct rcu_head *head) | |
790 | { | |
791 | struct relay_stream *stream = | |
792 | caa_container_of(head, struct relay_stream, rcu_node); | |
793 | free(stream); | |
794 | } | |
795 | ||
b8aa1682 JD |
796 | /* |
797 | * relay_delete_session: Free all memory associated with a session and | |
798 | * close all the FDs | |
799 | */ | |
800 | static | |
801 | void relay_delete_session(struct relay_command *cmd, struct lttng_ht *streams_ht) | |
802 | { | |
803 | struct lttng_ht_iter iter; | |
804 | struct lttng_ht_node_ulong *node; | |
805 | struct relay_stream *stream; | |
806 | int ret; | |
807 | ||
095a4ae5 | 808 | if (!cmd->session) { |
b8aa1682 | 809 | return; |
095a4ae5 | 810 | } |
b8aa1682 | 811 | |
77c7c900 | 812 | DBG("Relay deleting session %" PRIu64, cmd->session->id); |
5b6d8097 | 813 | |
9d1bbf21 | 814 | rcu_read_lock(); |
b8aa1682 JD |
815 | cds_lfht_for_each_entry(streams_ht->ht, &iter.iter, node, node) { |
816 | node = lttng_ht_iter_get_node_ulong(&iter); | |
817 | if (node) { | |
818 | stream = caa_container_of(node, | |
819 | struct relay_stream, stream_n); | |
820 | if (stream->session == cmd->session) { | |
f66c074c DG |
821 | ret = close(stream->fd); |
822 | if (ret < 0) { | |
823 | PERROR("close stream fd on delete session"); | |
824 | } | |
b8aa1682 JD |
825 | ret = lttng_ht_del(streams_ht, &iter); |
826 | assert(!ret); | |
9d1bbf21 MD |
827 | call_rcu(&stream->rcu_node, |
828 | deferred_free_stream); | |
b8aa1682 JD |
829 | } |
830 | } | |
831 | } | |
9d1bbf21 | 832 | rcu_read_unlock(); |
5b6d8097 DG |
833 | |
834 | free(cmd->session); | |
b8aa1682 JD |
835 | } |
836 | ||
c5b6f4f0 DG |
837 | /* |
838 | * Handle the RELAYD_CREATE_SESSION command. | |
839 | * | |
840 | * On success, send back the session id or else return a negative value. | |
841 | */ | |
842 | static | |
843 | int relay_create_session(struct lttcomm_relayd_hdr *recv_hdr, | |
844 | struct relay_command *cmd) | |
845 | { | |
846 | int ret = 0, send_ret; | |
847 | struct relay_session *session; | |
848 | struct lttcomm_relayd_status_session reply; | |
849 | ||
850 | assert(recv_hdr); | |
851 | assert(cmd); | |
852 | ||
853 | memset(&reply, 0, sizeof(reply)); | |
854 | ||
855 | session = zmalloc(sizeof(struct relay_session)); | |
856 | if (session == NULL) { | |
857 | PERROR("relay session zmalloc"); | |
858 | ret = -1; | |
859 | goto error; | |
860 | } | |
861 | ||
862 | session->id = ++last_relay_session_id; | |
863 | session->sock = cmd->sock; | |
864 | cmd->session = session; | |
865 | ||
866 | reply.session_id = htobe64(session->id); | |
867 | ||
868 | DBG("Created session %" PRIu64, session->id); | |
869 | ||
870 | error: | |
871 | if (ret < 0) { | |
872 | reply.ret_code = htobe32(LTTNG_ERR_FATAL); | |
873 | } else { | |
874 | reply.ret_code = htobe32(LTTNG_OK); | |
875 | } | |
876 | ||
877 | send_ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); | |
878 | if (send_ret < 0) { | |
879 | ERR("Relayd sending session id"); | |
4169f5ad | 880 | ret = send_ret; |
c5b6f4f0 DG |
881 | } |
882 | ||
883 | return ret; | |
884 | } | |
885 | ||
b8aa1682 JD |
886 | /* |
887 | * relay_add_stream: allocate a new stream for a session | |
888 | */ | |
889 | static | |
890 | int relay_add_stream(struct lttcomm_relayd_hdr *recv_hdr, | |
891 | struct relay_command *cmd, struct lttng_ht *streams_ht) | |
892 | { | |
893 | struct relay_session *session = cmd->session; | |
894 | struct lttcomm_relayd_add_stream stream_info; | |
895 | struct relay_stream *stream = NULL; | |
896 | struct lttcomm_relayd_status_stream reply; | |
897 | char *path = NULL, *root_path = NULL; | |
898 | int ret, send_ret; | |
899 | ||
c5b6f4f0 | 900 | if (!session || cmd->version_check_done == 0) { |
b8aa1682 JD |
901 | ERR("Trying to add a stream before version check"); |
902 | ret = -1; | |
903 | goto end_no_session; | |
904 | } | |
905 | ||
b8aa1682 | 906 | ret = cmd->sock->ops->recvmsg(cmd->sock, &stream_info, |
7c5aef62 | 907 | sizeof(struct lttcomm_relayd_add_stream), 0); |
b8aa1682 | 908 | if (ret < sizeof(struct lttcomm_relayd_add_stream)) { |
a6cd2b97 DG |
909 | if (ret == 0) { |
910 | /* Orderly shutdown. Not necessary to print an error. */ | |
911 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); | |
912 | } else { | |
913 | ERR("Relay didn't receive valid add_stream struct size : %d", ret); | |
914 | } | |
b8aa1682 JD |
915 | ret = -1; |
916 | goto end_no_session; | |
917 | } | |
918 | stream = zmalloc(sizeof(struct relay_stream)); | |
919 | if (stream == NULL) { | |
920 | PERROR("relay stream zmalloc"); | |
921 | ret = -1; | |
922 | goto end_no_session; | |
923 | } | |
924 | ||
9d1bbf21 | 925 | rcu_read_lock(); |
b8aa1682 | 926 | stream->stream_handle = ++last_relay_stream_id; |
173af62f | 927 | stream->prev_seq = -1ULL; |
b8aa1682 JD |
928 | stream->session = session; |
929 | ||
930 | root_path = create_output_path(stream_info.pathname); | |
931 | if (!root_path) { | |
932 | ret = -1; | |
933 | goto end; | |
934 | } | |
834f3ec7 | 935 | ret = utils_mkdir_recursive(root_path, S_IRWXU | S_IRWXG); |
b8aa1682 | 936 | if (ret < 0) { |
b8aa1682 JD |
937 | ERR("relay creating output directory"); |
938 | goto end; | |
939 | } | |
940 | ||
941 | ret = asprintf(&path, "%s/%s", root_path, stream_info.channel_name); | |
942 | if (ret < 0) { | |
943 | PERROR("asprintf stream path"); | |
944 | goto end; | |
945 | } | |
946 | ||
947 | ret = open(path, O_WRONLY|O_CREAT|O_TRUNC, S_IRWXU|S_IRWXG|S_IRWXO); | |
948 | if (ret < 0) { | |
949 | PERROR("Relay creating trace file"); | |
950 | goto end; | |
951 | } | |
952 | ||
953 | stream->fd = ret; | |
954 | DBG("Tracefile %s created", path); | |
955 | ||
956 | lttng_ht_node_init_ulong(&stream->stream_n, | |
957 | (unsigned long) stream->stream_handle); | |
958 | lttng_ht_add_unique_ulong(streams_ht, | |
959 | &stream->stream_n); | |
960 | ||
961 | DBG("Relay new stream added %s", stream_info.channel_name); | |
962 | ||
963 | end: | |
964 | free(path); | |
965 | free(root_path); | |
966 | /* send the session id to the client or a negative return code on error */ | |
967 | if (ret < 0) { | |
f73fabfd | 968 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
b8aa1682 | 969 | } else { |
f73fabfd | 970 | reply.ret_code = htobe32(LTTNG_OK); |
b8aa1682 JD |
971 | } |
972 | reply.handle = htobe64(stream->stream_handle); | |
973 | send_ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, | |
974 | sizeof(struct lttcomm_relayd_status_stream), 0); | |
975 | if (send_ret < 0) { | |
976 | ERR("Relay sending stream id"); | |
4169f5ad | 977 | ret = send_ret; |
b8aa1682 | 978 | } |
9d1bbf21 | 979 | rcu_read_unlock(); |
b8aa1682 JD |
980 | |
981 | end_no_session: | |
982 | return ret; | |
983 | } | |
984 | ||
173af62f DG |
985 | /* |
986 | * relay_close_stream: close a specific stream | |
987 | */ | |
988 | static | |
989 | int relay_close_stream(struct lttcomm_relayd_hdr *recv_hdr, | |
990 | struct relay_command *cmd, struct lttng_ht *streams_ht) | |
991 | { | |
992 | struct relay_session *session = cmd->session; | |
993 | struct lttcomm_relayd_close_stream stream_info; | |
994 | struct lttcomm_relayd_generic_reply reply; | |
995 | struct relay_stream *stream; | |
996 | int ret, send_ret; | |
173af62f DG |
997 | struct lttng_ht_iter iter; |
998 | ||
999 | DBG("Close stream received"); | |
1000 | ||
c5b6f4f0 | 1001 | if (!session || cmd->version_check_done == 0) { |
173af62f DG |
1002 | ERR("Trying to close a stream before version check"); |
1003 | ret = -1; | |
1004 | goto end_no_session; | |
1005 | } | |
1006 | ||
1007 | ret = cmd->sock->ops->recvmsg(cmd->sock, &stream_info, | |
7c5aef62 | 1008 | sizeof(struct lttcomm_relayd_close_stream), 0); |
173af62f | 1009 | if (ret < sizeof(struct lttcomm_relayd_close_stream)) { |
a6cd2b97 DG |
1010 | if (ret == 0) { |
1011 | /* Orderly shutdown. Not necessary to print an error. */ | |
1012 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); | |
1013 | } else { | |
1014 | ERR("Relay didn't receive valid add_stream struct size : %d", ret); | |
1015 | } | |
173af62f DG |
1016 | ret = -1; |
1017 | goto end_no_session; | |
1018 | } | |
1019 | ||
1020 | rcu_read_lock(); | |
de91f48a DG |
1021 | stream = relay_stream_from_stream_id(be64toh(stream_info.stream_id), |
1022 | streams_ht); | |
173af62f DG |
1023 | if (!stream) { |
1024 | ret = -1; | |
1025 | goto end_unlock; | |
1026 | } | |
1027 | ||
8e2583a4 | 1028 | stream->last_net_seq_num = be64toh(stream_info.last_net_seq_num); |
173af62f DG |
1029 | stream->close_flag = 1; |
1030 | ||
1031 | if (close_stream_check(stream)) { | |
1032 | int delret; | |
1033 | ||
f66c074c DG |
1034 | delret = close(stream->fd); |
1035 | if (delret < 0) { | |
1036 | PERROR("close stream"); | |
1037 | } | |
de91f48a | 1038 | iter.iter.node = &stream->stream_n.node; |
173af62f DG |
1039 | delret = lttng_ht_del(streams_ht, &iter); |
1040 | assert(!delret); | |
1041 | call_rcu(&stream->rcu_node, | |
1042 | deferred_free_stream); | |
1043 | DBG("Closed tracefile %d from close stream", stream->fd); | |
1044 | } | |
1045 | ||
1046 | end_unlock: | |
1047 | rcu_read_unlock(); | |
1048 | ||
1049 | if (ret < 0) { | |
f73fabfd | 1050 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
173af62f | 1051 | } else { |
f73fabfd | 1052 | reply.ret_code = htobe32(LTTNG_OK); |
173af62f DG |
1053 | } |
1054 | send_ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, | |
1055 | sizeof(struct lttcomm_relayd_generic_reply), 0); | |
1056 | if (send_ret < 0) { | |
1057 | ERR("Relay sending stream id"); | |
4169f5ad | 1058 | ret = send_ret; |
173af62f DG |
1059 | } |
1060 | ||
1061 | end_no_session: | |
1062 | return ret; | |
1063 | } | |
1064 | ||
b8aa1682 JD |
1065 | /* |
1066 | * relay_unknown_command: send -1 if received unknown command | |
1067 | */ | |
1068 | static | |
1069 | void relay_unknown_command(struct relay_command *cmd) | |
1070 | { | |
1071 | struct lttcomm_relayd_generic_reply reply; | |
1072 | int ret; | |
1073 | ||
f73fabfd | 1074 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
b8aa1682 JD |
1075 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, |
1076 | sizeof(struct lttcomm_relayd_generic_reply), 0); | |
1077 | if (ret < 0) { | |
1078 | ERR("Relay sending unknown command"); | |
1079 | } | |
1080 | } | |
1081 | ||
1082 | /* | |
1083 | * relay_start: send an acknowledgment to the client to tell if we are | |
1084 | * ready to receive data. We are ready if a session is established. | |
1085 | */ | |
1086 | static | |
1087 | int relay_start(struct lttcomm_relayd_hdr *recv_hdr, | |
1088 | struct relay_command *cmd) | |
1089 | { | |
f73fabfd | 1090 | int ret = htobe32(LTTNG_OK); |
b8aa1682 JD |
1091 | struct lttcomm_relayd_generic_reply reply; |
1092 | struct relay_session *session = cmd->session; | |
1093 | ||
1094 | if (!session) { | |
1095 | DBG("Trying to start the streaming without a session established"); | |
f73fabfd | 1096 | ret = htobe32(LTTNG_ERR_UNK); |
b8aa1682 JD |
1097 | } |
1098 | ||
1099 | reply.ret_code = ret; | |
1100 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, | |
1101 | sizeof(struct lttcomm_relayd_generic_reply), 0); | |
1102 | if (ret < 0) { | |
1103 | ERR("Relay sending start ack"); | |
1104 | } | |
1105 | ||
1106 | return ret; | |
1107 | } | |
1108 | ||
1d4dfdef DG |
1109 | /* |
1110 | * Append padding to the file pointed by the file descriptor fd. | |
1111 | */ | |
1112 | static int write_padding_to_file(int fd, uint32_t size) | |
1113 | { | |
1114 | int ret = 0; | |
1115 | char *zeros; | |
1116 | ||
1117 | if (size == 0) { | |
1118 | goto end; | |
1119 | } | |
1120 | ||
1121 | zeros = zmalloc(size); | |
1122 | if (zeros == NULL) { | |
1123 | PERROR("zmalloc zeros for padding"); | |
1124 | ret = -1; | |
1125 | goto end; | |
1126 | } | |
1127 | ||
1128 | do { | |
1129 | ret = write(fd, zeros, size); | |
1130 | } while (ret < 0 && errno == EINTR); | |
4cec016f | 1131 | if (ret < 0 || ret != size) { |
1d4dfdef DG |
1132 | PERROR("write padding to file"); |
1133 | } | |
1134 | ||
e986c7a1 DG |
1135 | free(zeros); |
1136 | ||
1d4dfdef DG |
1137 | end: |
1138 | return ret; | |
1139 | } | |
1140 | ||
b8aa1682 JD |
1141 | /* |
1142 | * relay_recv_metadata: receive the metada for the session. | |
1143 | */ | |
1144 | static | |
1145 | int relay_recv_metadata(struct lttcomm_relayd_hdr *recv_hdr, | |
1146 | struct relay_command *cmd, struct lttng_ht *streams_ht) | |
1147 | { | |
f73fabfd | 1148 | int ret = htobe32(LTTNG_OK); |
b8aa1682 JD |
1149 | struct relay_session *session = cmd->session; |
1150 | struct lttcomm_relayd_metadata_payload *metadata_struct; | |
1151 | struct relay_stream *metadata_stream; | |
1152 | uint64_t data_size, payload_size; | |
1153 | ||
1154 | if (!session) { | |
1155 | ERR("Metadata sent before version check"); | |
1156 | ret = -1; | |
1157 | goto end; | |
1158 | } | |
1159 | ||
f6416125 MD |
1160 | data_size = payload_size = be64toh(recv_hdr->data_size); |
1161 | if (data_size < sizeof(struct lttcomm_relayd_metadata_payload)) { | |
1162 | ERR("Incorrect data size"); | |
1163 | ret = -1; | |
1164 | goto end; | |
1165 | } | |
1166 | payload_size -= sizeof(struct lttcomm_relayd_metadata_payload); | |
1167 | ||
b8aa1682 | 1168 | if (data_buffer_size < data_size) { |
d7b3776f | 1169 | /* In case the realloc fails, we can free the memory */ |
c617c0c6 MD |
1170 | char *tmp_data_ptr; |
1171 | ||
1172 | tmp_data_ptr = realloc(data_buffer, data_size); | |
1173 | if (!tmp_data_ptr) { | |
b8aa1682 | 1174 | ERR("Allocating data buffer"); |
c617c0c6 | 1175 | free(data_buffer); |
b8aa1682 JD |
1176 | ret = -1; |
1177 | goto end; | |
1178 | } | |
c617c0c6 | 1179 | data_buffer = tmp_data_ptr; |
b8aa1682 JD |
1180 | data_buffer_size = data_size; |
1181 | } | |
1182 | memset(data_buffer, 0, data_size); | |
77c7c900 | 1183 | DBG2("Relay receiving metadata, waiting for %" PRIu64 " bytes", data_size); |
7c5aef62 | 1184 | ret = cmd->sock->ops->recvmsg(cmd->sock, data_buffer, data_size, 0); |
b8aa1682 | 1185 | if (ret < 0 || ret != data_size) { |
a6cd2b97 DG |
1186 | if (ret == 0) { |
1187 | /* Orderly shutdown. Not necessary to print an error. */ | |
1188 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); | |
1189 | } else { | |
1190 | ERR("Relay didn't receive the whole metadata"); | |
1191 | } | |
b8aa1682 | 1192 | ret = -1; |
b8aa1682 JD |
1193 | goto end; |
1194 | } | |
1195 | metadata_struct = (struct lttcomm_relayd_metadata_payload *) data_buffer; | |
9d1bbf21 MD |
1196 | |
1197 | rcu_read_lock(); | |
b8aa1682 JD |
1198 | metadata_stream = relay_stream_from_stream_id( |
1199 | be64toh(metadata_struct->stream_id), streams_ht); | |
1200 | if (!metadata_stream) { | |
1201 | ret = -1; | |
9d1bbf21 | 1202 | goto end_unlock; |
b8aa1682 JD |
1203 | } |
1204 | ||
6f94560a MD |
1205 | do { |
1206 | ret = write(metadata_stream->fd, metadata_struct->payload, | |
1207 | payload_size); | |
1208 | } while (ret < 0 && errno == EINTR); | |
4cec016f | 1209 | if (ret < 0 || ret != payload_size) { |
b8aa1682 JD |
1210 | ERR("Relay error writing metadata on file"); |
1211 | ret = -1; | |
9d1bbf21 | 1212 | goto end_unlock; |
b8aa1682 | 1213 | } |
1d4dfdef DG |
1214 | |
1215 | ret = write_padding_to_file(metadata_stream->fd, | |
1216 | be32toh(metadata_struct->padding_size)); | |
1217 | if (ret < 0) { | |
1218 | goto end_unlock; | |
1219 | } | |
1220 | ||
b8aa1682 JD |
1221 | DBG2("Relay metadata written"); |
1222 | ||
9d1bbf21 | 1223 | end_unlock: |
6e3c5836 | 1224 | rcu_read_unlock(); |
b8aa1682 JD |
1225 | end: |
1226 | return ret; | |
1227 | } | |
1228 | ||
1229 | /* | |
1230 | * relay_send_version: send relayd version number | |
1231 | */ | |
1232 | static | |
1233 | int relay_send_version(struct lttcomm_relayd_hdr *recv_hdr, | |
1234 | struct relay_command *cmd) | |
1235 | { | |
7f51dcba | 1236 | int ret; |
092b6259 | 1237 | struct lttcomm_relayd_version reply, msg; |
b8aa1682 | 1238 | |
c5b6f4f0 DG |
1239 | assert(cmd); |
1240 | ||
1241 | cmd->version_check_done = 1; | |
b8aa1682 | 1242 | |
092b6259 | 1243 | /* Get version from the other side. */ |
7c5aef62 | 1244 | ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); |
092b6259 | 1245 | if (ret < 0 || ret != sizeof(msg)) { |
a6cd2b97 DG |
1246 | if (ret == 0) { |
1247 | /* Orderly shutdown. Not necessary to print an error. */ | |
1248 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); | |
1249 | } else { | |
1250 | ERR("Relay failed to receive the version values."); | |
1251 | } | |
092b6259 | 1252 | ret = -1; |
092b6259 DG |
1253 | goto end; |
1254 | } | |
1255 | ||
1256 | /* | |
1257 | * For now, we just ignore the received version but after 2.1 stable | |
1258 | * release, a check must be done to see if we either adapt to the other | |
1259 | * side version (which MUST be lower than us) or keep the latest data | |
1260 | * structure considering that the other side will adapt. | |
1261 | */ | |
1262 | ||
c617c0c6 | 1263 | ret = sscanf(VERSION, "%10u.%10u", &reply.major, &reply.minor); |
7f51dcba MD |
1264 | if (ret < 2) { |
1265 | ERR("Error in scanning version"); | |
1266 | ret = -1; | |
1267 | goto end; | |
1268 | } | |
b8aa1682 JD |
1269 | reply.major = htobe32(reply.major); |
1270 | reply.minor = htobe32(reply.minor); | |
1271 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, | |
1272 | sizeof(struct lttcomm_relayd_version), 0); | |
1273 | if (ret < 0) { | |
1274 | ERR("Relay sending version"); | |
1275 | } | |
0a6b5085 DG |
1276 | DBG("Version check done (%u.%u)", be32toh(reply.major), |
1277 | be32toh(reply.minor)); | |
b8aa1682 JD |
1278 | |
1279 | end: | |
1280 | return ret; | |
1281 | } | |
1282 | ||
c8f59ee5 | 1283 | /* |
6d805429 | 1284 | * Check for data pending for a given stream id from the session daemon. |
c8f59ee5 DG |
1285 | */ |
1286 | static | |
6d805429 | 1287 | int relay_data_pending(struct lttcomm_relayd_hdr *recv_hdr, |
c8f59ee5 DG |
1288 | struct relay_command *cmd, struct lttng_ht *streams_ht) |
1289 | { | |
1290 | struct relay_session *session = cmd->session; | |
6d805429 | 1291 | struct lttcomm_relayd_data_pending msg; |
c8f59ee5 DG |
1292 | struct lttcomm_relayd_generic_reply reply; |
1293 | struct relay_stream *stream; | |
1294 | int ret; | |
c8f59ee5 DG |
1295 | uint64_t last_net_seq_num, stream_id; |
1296 | ||
6d805429 | 1297 | DBG("Data pending command received"); |
c8f59ee5 | 1298 | |
c5b6f4f0 | 1299 | if (!session || cmd->version_check_done == 0) { |
c8f59ee5 DG |
1300 | ERR("Trying to check for data before version check"); |
1301 | ret = -1; | |
1302 | goto end_no_session; | |
1303 | } | |
1304 | ||
7c5aef62 | 1305 | ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); |
c8f59ee5 | 1306 | if (ret < sizeof(msg)) { |
a6cd2b97 DG |
1307 | if (ret == 0) { |
1308 | /* Orderly shutdown. Not necessary to print an error. */ | |
1309 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); | |
1310 | } else { | |
1311 | ERR("Relay didn't receive valid data_pending struct size : %d", | |
1312 | ret); | |
1313 | } | |
c8f59ee5 DG |
1314 | ret = -1; |
1315 | goto end_no_session; | |
1316 | } | |
1317 | ||
1318 | stream_id = be64toh(msg.stream_id); | |
1319 | last_net_seq_num = be64toh(msg.last_net_seq_num); | |
1320 | ||
1321 | rcu_read_lock(); | |
de91f48a DG |
1322 | stream = relay_stream_from_stream_id(stream_id, streams_ht); |
1323 | if (stream == NULL) { | |
c8f59ee5 DG |
1324 | ret = -1; |
1325 | goto end_unlock; | |
1326 | } | |
1327 | ||
6d805429 | 1328 | DBG("Data pending for stream id %" PRIu64 " prev_seq %" PRIu64 |
c8f59ee5 DG |
1329 | " and last_seq %" PRIu64, stream_id, stream->prev_seq, |
1330 | last_net_seq_num); | |
1331 | ||
33832e64 | 1332 | /* Avoid wrapping issue */ |
39df6d9f | 1333 | if (((int64_t) (stream->prev_seq - last_net_seq_num)) >= 0) { |
6d805429 | 1334 | /* Data has in fact been written and is NOT pending */ |
c8f59ee5 | 1335 | ret = 0; |
6d805429 DG |
1336 | } else { |
1337 | /* Data still being streamed thus pending */ | |
1338 | ret = 1; | |
c8f59ee5 DG |
1339 | } |
1340 | ||
f7079f67 DG |
1341 | /* Pending check is now done. */ |
1342 | stream->data_pending_check_done = 1; | |
1343 | ||
c8f59ee5 DG |
1344 | end_unlock: |
1345 | rcu_read_unlock(); | |
1346 | ||
1347 | reply.ret_code = htobe32(ret); | |
1348 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); | |
1349 | if (ret < 0) { | |
6d805429 | 1350 | ERR("Relay data pending ret code failed"); |
c8f59ee5 DG |
1351 | } |
1352 | ||
1353 | end_no_session: | |
1354 | return ret; | |
1355 | } | |
1356 | ||
1357 | /* | |
1358 | * Wait for the control socket to reach a quiescent state. | |
1359 | * | |
1360 | * Note that for now, when receiving this command from the session daemon, this | |
1361 | * means that every subsequent commands or data received on the control socket | |
1362 | * has been handled. So, this is why we simply return OK here. | |
1363 | */ | |
1364 | static | |
1365 | int relay_quiescent_control(struct lttcomm_relayd_hdr *recv_hdr, | |
ad7051c0 | 1366 | struct relay_command *cmd, struct lttng_ht *streams_ht) |
c8f59ee5 DG |
1367 | { |
1368 | int ret; | |
ad7051c0 DG |
1369 | uint64_t stream_id; |
1370 | struct relay_stream *stream; | |
1371 | struct lttng_ht_iter iter; | |
1372 | struct lttcomm_relayd_quiescent_control msg; | |
c8f59ee5 DG |
1373 | struct lttcomm_relayd_generic_reply reply; |
1374 | ||
1375 | DBG("Checking quiescent state on control socket"); | |
1376 | ||
ad7051c0 DG |
1377 | if (!cmd->session || cmd->version_check_done == 0) { |
1378 | ERR("Trying to check for data before version check"); | |
1379 | ret = -1; | |
1380 | goto end_no_session; | |
1381 | } | |
1382 | ||
1383 | ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); | |
1384 | if (ret < sizeof(msg)) { | |
a6cd2b97 DG |
1385 | if (ret == 0) { |
1386 | /* Orderly shutdown. Not necessary to print an error. */ | |
1387 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); | |
1388 | } else { | |
1389 | ERR("Relay didn't receive valid begin data_pending struct size: %d", | |
1390 | ret); | |
1391 | } | |
ad7051c0 DG |
1392 | ret = -1; |
1393 | goto end_no_session; | |
1394 | } | |
1395 | ||
1396 | stream_id = be64toh(msg.stream_id); | |
1397 | ||
1398 | rcu_read_lock(); | |
1399 | cds_lfht_for_each_entry(streams_ht->ht, &iter.iter, stream, stream_n.node) { | |
1400 | if (stream->stream_handle == stream_id) { | |
1401 | stream->data_pending_check_done = 1; | |
1402 | DBG("Relay quiescent control pending flag set to %" PRIu64, | |
1403 | stream_id); | |
1404 | break; | |
1405 | } | |
1406 | } | |
1407 | rcu_read_unlock(); | |
1408 | ||
c8f59ee5 DG |
1409 | reply.ret_code = htobe32(LTTNG_OK); |
1410 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); | |
1411 | if (ret < 0) { | |
6d805429 | 1412 | ERR("Relay data quiescent control ret code failed"); |
c8f59ee5 DG |
1413 | } |
1414 | ||
ad7051c0 | 1415 | end_no_session: |
c8f59ee5 DG |
1416 | return ret; |
1417 | } | |
1418 | ||
f7079f67 DG |
1419 | /* |
1420 | * Initialize a data pending command. This means that a client is about to ask | |
1421 | * for data pending for each stream he/she holds. Simply iterate over all | |
1422 | * streams of a session and set the data_pending_check_done flag. | |
1423 | * | |
1424 | * This command returns to the client a LTTNG_OK code. | |
1425 | */ | |
1426 | static | |
1427 | int relay_begin_data_pending(struct lttcomm_relayd_hdr *recv_hdr, | |
1428 | struct relay_command *cmd, struct lttng_ht *streams_ht) | |
1429 | { | |
1430 | int ret; | |
1431 | struct lttng_ht_iter iter; | |
1432 | struct lttcomm_relayd_begin_data_pending msg; | |
1433 | struct lttcomm_relayd_generic_reply reply; | |
1434 | struct relay_stream *stream; | |
1435 | uint64_t session_id; | |
1436 | ||
1437 | assert(recv_hdr); | |
1438 | assert(cmd); | |
1439 | assert(streams_ht); | |
1440 | ||
1441 | DBG("Init streams for data pending"); | |
1442 | ||
1443 | if (!cmd->session || cmd->version_check_done == 0) { | |
1444 | ERR("Trying to check for data before version check"); | |
1445 | ret = -1; | |
1446 | goto end_no_session; | |
1447 | } | |
1448 | ||
1449 | ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); | |
1450 | if (ret < sizeof(msg)) { | |
a6cd2b97 DG |
1451 | if (ret == 0) { |
1452 | /* Orderly shutdown. Not necessary to print an error. */ | |
1453 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); | |
1454 | } else { | |
1455 | ERR("Relay didn't receive valid begin data_pending struct size: %d", | |
1456 | ret); | |
1457 | } | |
f7079f67 DG |
1458 | ret = -1; |
1459 | goto end_no_session; | |
1460 | } | |
1461 | ||
1462 | session_id = be64toh(msg.session_id); | |
1463 | ||
1464 | /* | |
1465 | * Iterate over all streams to set the begin data pending flag. For now, the | |
1466 | * streams are indexed by stream handle so we have to iterate over all | |
1467 | * streams to find the one associated with the right session_id. | |
1468 | */ | |
1469 | rcu_read_lock(); | |
1470 | cds_lfht_for_each_entry(streams_ht->ht, &iter.iter, stream, stream_n.node) { | |
1471 | if (stream->session->id == session_id) { | |
1472 | stream->data_pending_check_done = 0; | |
1473 | DBG("Set begin data pending flag to stream %" PRIu64, | |
1474 | stream->stream_handle); | |
1475 | } | |
1476 | } | |
1477 | rcu_read_unlock(); | |
1478 | ||
1479 | /* All good, send back reply. */ | |
1480 | reply.ret_code = htobe32(LTTNG_OK); | |
1481 | ||
1482 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); | |
1483 | if (ret < 0) { | |
1484 | ERR("Relay begin data pending send reply failed"); | |
1485 | } | |
1486 | ||
1487 | end_no_session: | |
1488 | return ret; | |
1489 | } | |
1490 | ||
1491 | /* | |
1492 | * End data pending command. This will check, for a given session id, if each | |
1493 | * stream associated with it has its data_pending_check_done flag set. If not, | |
1494 | * this means that the client lost track of the stream but the data is still | |
1495 | * being streamed on our side. In this case, we inform the client that data is | |
1496 | * inflight. | |
1497 | * | |
1498 | * Return to the client if there is data in flight or not with a ret_code. | |
1499 | */ | |
1500 | static | |
1501 | int relay_end_data_pending(struct lttcomm_relayd_hdr *recv_hdr, | |
1502 | struct relay_command *cmd, struct lttng_ht *streams_ht) | |
1503 | { | |
1504 | int ret; | |
1505 | struct lttng_ht_iter iter; | |
1506 | struct lttcomm_relayd_end_data_pending msg; | |
1507 | struct lttcomm_relayd_generic_reply reply; | |
1508 | struct relay_stream *stream; | |
1509 | uint64_t session_id; | |
1510 | uint32_t is_data_inflight = 0; | |
1511 | ||
1512 | assert(recv_hdr); | |
1513 | assert(cmd); | |
1514 | assert(streams_ht); | |
1515 | ||
1516 | DBG("End data pending command"); | |
1517 | ||
1518 | if (!cmd->session || cmd->version_check_done == 0) { | |
1519 | ERR("Trying to check for data before version check"); | |
1520 | ret = -1; | |
1521 | goto end_no_session; | |
1522 | } | |
1523 | ||
1524 | ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); | |
1525 | if (ret < sizeof(msg)) { | |
a6cd2b97 DG |
1526 | if (ret == 0) { |
1527 | /* Orderly shutdown. Not necessary to print an error. */ | |
1528 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); | |
1529 | } else { | |
1530 | ERR("Relay didn't receive valid end data_pending struct size: %d", | |
1531 | ret); | |
1532 | } | |
f7079f67 DG |
1533 | ret = -1; |
1534 | goto end_no_session; | |
1535 | } | |
1536 | ||
1537 | session_id = be64toh(msg.session_id); | |
1538 | ||
1539 | /* Iterate over all streams to see if the begin data pending flag is set. */ | |
1540 | rcu_read_lock(); | |
1541 | cds_lfht_for_each_entry(streams_ht->ht, &iter.iter, stream, stream_n.node) { | |
1542 | if (stream->session->id == session_id && | |
1543 | !stream->data_pending_check_done) { | |
1544 | is_data_inflight = 1; | |
1545 | DBG("Data is still in flight for stream %" PRIu64, | |
1546 | stream->stream_handle); | |
1547 | break; | |
1548 | } | |
1549 | } | |
1550 | rcu_read_unlock(); | |
1551 | ||
1552 | /* All good, send back reply. */ | |
1553 | reply.ret_code = htobe32(is_data_inflight); | |
1554 | ||
1555 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); | |
1556 | if (ret < 0) { | |
1557 | ERR("Relay end data pending send reply failed"); | |
1558 | } | |
1559 | ||
1560 | end_no_session: | |
1561 | return ret; | |
1562 | } | |
1563 | ||
b8aa1682 JD |
1564 | /* |
1565 | * relay_process_control: Process the commands received on the control socket | |
1566 | */ | |
1567 | static | |
1568 | int relay_process_control(struct lttcomm_relayd_hdr *recv_hdr, | |
1569 | struct relay_command *cmd, struct lttng_ht *streams_ht) | |
1570 | { | |
1571 | int ret = 0; | |
1572 | ||
1573 | switch (be32toh(recv_hdr->cmd)) { | |
b8aa1682 JD |
1574 | case RELAYD_CREATE_SESSION: |
1575 | ret = relay_create_session(recv_hdr, cmd); | |
1576 | break; | |
b8aa1682 JD |
1577 | case RELAYD_ADD_STREAM: |
1578 | ret = relay_add_stream(recv_hdr, cmd, streams_ht); | |
1579 | break; | |
1580 | case RELAYD_START_DATA: | |
1581 | ret = relay_start(recv_hdr, cmd); | |
1582 | break; | |
1583 | case RELAYD_SEND_METADATA: | |
1584 | ret = relay_recv_metadata(recv_hdr, cmd, streams_ht); | |
1585 | break; | |
1586 | case RELAYD_VERSION: | |
1587 | ret = relay_send_version(recv_hdr, cmd); | |
1588 | break; | |
173af62f DG |
1589 | case RELAYD_CLOSE_STREAM: |
1590 | ret = relay_close_stream(recv_hdr, cmd, streams_ht); | |
1591 | break; | |
6d805429 DG |
1592 | case RELAYD_DATA_PENDING: |
1593 | ret = relay_data_pending(recv_hdr, cmd, streams_ht); | |
c8f59ee5 DG |
1594 | break; |
1595 | case RELAYD_QUIESCENT_CONTROL: | |
ad7051c0 | 1596 | ret = relay_quiescent_control(recv_hdr, cmd, streams_ht); |
c8f59ee5 | 1597 | break; |
f7079f67 DG |
1598 | case RELAYD_BEGIN_DATA_PENDING: |
1599 | ret = relay_begin_data_pending(recv_hdr, cmd, streams_ht); | |
1600 | break; | |
1601 | case RELAYD_END_DATA_PENDING: | |
1602 | ret = relay_end_data_pending(recv_hdr, cmd, streams_ht); | |
1603 | break; | |
b8aa1682 JD |
1604 | case RELAYD_UPDATE_SYNC_INFO: |
1605 | default: | |
1606 | ERR("Received unknown command (%u)", be32toh(recv_hdr->cmd)); | |
1607 | relay_unknown_command(cmd); | |
1608 | ret = -1; | |
1609 | goto end; | |
1610 | } | |
1611 | ||
1612 | end: | |
1613 | return ret; | |
1614 | } | |
1615 | ||
1616 | /* | |
1617 | * relay_process_data: Process the data received on the data socket | |
1618 | */ | |
1619 | static | |
1620 | int relay_process_data(struct relay_command *cmd, struct lttng_ht *streams_ht) | |
1621 | { | |
1622 | int ret = 0; | |
1623 | struct relay_stream *stream; | |
1624 | struct lttcomm_relayd_data_hdr data_hdr; | |
1625 | uint64_t stream_id; | |
173af62f | 1626 | uint64_t net_seq_num; |
b8aa1682 JD |
1627 | uint32_t data_size; |
1628 | ||
1629 | ret = cmd->sock->ops->recvmsg(cmd->sock, &data_hdr, | |
7c5aef62 | 1630 | sizeof(struct lttcomm_relayd_data_hdr), 0); |
b8aa1682 | 1631 | if (ret <= 0) { |
a6cd2b97 DG |
1632 | if (ret == 0) { |
1633 | /* Orderly shutdown. Not necessary to print an error. */ | |
1634 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); | |
1635 | } else { | |
1636 | ERR("Unable to receive data header on sock %d", cmd->sock->fd); | |
1637 | } | |
b8aa1682 JD |
1638 | ret = -1; |
1639 | goto end; | |
1640 | } | |
1641 | ||
1642 | stream_id = be64toh(data_hdr.stream_id); | |
9d1bbf21 MD |
1643 | |
1644 | rcu_read_lock(); | |
b8aa1682 JD |
1645 | stream = relay_stream_from_stream_id(stream_id, streams_ht); |
1646 | if (!stream) { | |
1647 | ret = -1; | |
9d1bbf21 | 1648 | goto end_unlock; |
b8aa1682 JD |
1649 | } |
1650 | ||
1651 | data_size = be32toh(data_hdr.data_size); | |
1652 | if (data_buffer_size < data_size) { | |
c617c0c6 MD |
1653 | char *tmp_data_ptr; |
1654 | ||
1655 | tmp_data_ptr = realloc(data_buffer, data_size); | |
1656 | if (!tmp_data_ptr) { | |
b8aa1682 | 1657 | ERR("Allocating data buffer"); |
c617c0c6 | 1658 | free(data_buffer); |
b8aa1682 | 1659 | ret = -1; |
9d1bbf21 | 1660 | goto end_unlock; |
b8aa1682 | 1661 | } |
c617c0c6 | 1662 | data_buffer = tmp_data_ptr; |
b8aa1682 JD |
1663 | data_buffer_size = data_size; |
1664 | } | |
1665 | memset(data_buffer, 0, data_size); | |
1666 | ||
173af62f DG |
1667 | net_seq_num = be64toh(data_hdr.net_seq_num); |
1668 | ||
77c7c900 | 1669 | DBG3("Receiving data of size %u for stream id %" PRIu64 " seqnum %" PRIu64, |
173af62f | 1670 | data_size, stream_id, net_seq_num); |
7c5aef62 | 1671 | ret = cmd->sock->ops->recvmsg(cmd->sock, data_buffer, data_size, 0); |
b8aa1682 | 1672 | if (ret <= 0) { |
a6cd2b97 DG |
1673 | if (ret == 0) { |
1674 | /* Orderly shutdown. Not necessary to print an error. */ | |
1675 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); | |
1676 | } | |
b8aa1682 | 1677 | ret = -1; |
9d1bbf21 | 1678 | goto end_unlock; |
b8aa1682 JD |
1679 | } |
1680 | ||
6f94560a MD |
1681 | do { |
1682 | ret = write(stream->fd, data_buffer, data_size); | |
1683 | } while (ret < 0 && errno == EINTR); | |
4cec016f | 1684 | if (ret < 0 || ret != data_size) { |
b8aa1682 JD |
1685 | ERR("Relay error writing data to file"); |
1686 | ret = -1; | |
9d1bbf21 | 1687 | goto end_unlock; |
b8aa1682 | 1688 | } |
1d4dfdef | 1689 | |
5ab7344e JD |
1690 | DBG2("Relay wrote %d bytes to tracefile for stream id %" PRIu64, |
1691 | ret, stream->stream_handle); | |
1692 | ||
1d4dfdef DG |
1693 | ret = write_padding_to_file(stream->fd, be32toh(data_hdr.padding_size)); |
1694 | if (ret < 0) { | |
1695 | goto end_unlock; | |
1696 | } | |
1697 | ||
173af62f DG |
1698 | stream->prev_seq = net_seq_num; |
1699 | ||
1700 | /* Check if we need to close the FD */ | |
1701 | if (close_stream_check(stream)) { | |
f66c074c | 1702 | int cret; |
173af62f DG |
1703 | struct lttng_ht_iter iter; |
1704 | ||
f66c074c DG |
1705 | cret = close(stream->fd); |
1706 | if (cret < 0) { | |
1707 | PERROR("close stream process data"); | |
1708 | } | |
173af62f DG |
1709 | iter.iter.node = &stream->stream_n.node; |
1710 | ret = lttng_ht_del(streams_ht, &iter); | |
1711 | assert(!ret); | |
1712 | call_rcu(&stream->rcu_node, | |
1713 | deferred_free_stream); | |
1714 | DBG("Closed tracefile %d after recv data", stream->fd); | |
1715 | } | |
1716 | ||
9d1bbf21 MD |
1717 | end_unlock: |
1718 | rcu_read_unlock(); | |
b8aa1682 JD |
1719 | end: |
1720 | return ret; | |
1721 | } | |
1722 | ||
1723 | static | |
9d1bbf21 | 1724 | void relay_cleanup_poll_connection(struct lttng_poll_event *events, int pollfd) |
b8aa1682 JD |
1725 | { |
1726 | int ret; | |
1727 | ||
b8aa1682 JD |
1728 | lttng_poll_del(events, pollfd); |
1729 | ||
1730 | ret = close(pollfd); | |
1731 | if (ret < 0) { | |
1732 | ERR("Closing pollfd %d", pollfd); | |
1733 | } | |
1734 | } | |
1735 | ||
1736 | static | |
1737 | int relay_add_connection(int fd, struct lttng_poll_event *events, | |
1738 | struct lttng_ht *relay_connections_ht) | |
1739 | { | |
b8aa1682 | 1740 | struct relay_command *relay_connection; |
9d1bbf21 | 1741 | int ret; |
b8aa1682 JD |
1742 | |
1743 | relay_connection = zmalloc(sizeof(struct relay_command)); | |
1744 | if (relay_connection == NULL) { | |
1745 | PERROR("Relay command zmalloc"); | |
9d1bbf21 | 1746 | goto error; |
b8aa1682 | 1747 | } |
f921c78f DG |
1748 | do { |
1749 | ret = read(fd, relay_connection, sizeof(struct relay_command)); | |
1750 | } while (ret < 0 && errno == EINTR); | |
cdf0f8fc | 1751 | if (ret < 0 || ret < sizeof(struct relay_command)) { |
b8aa1682 | 1752 | PERROR("read relay cmd pipe"); |
9d1bbf21 | 1753 | goto error_read; |
b8aa1682 JD |
1754 | } |
1755 | ||
1756 | lttng_ht_node_init_ulong(&relay_connection->sock_n, | |
1757 | (unsigned long) relay_connection->sock->fd); | |
9d1bbf21 | 1758 | rcu_read_lock(); |
b8aa1682 JD |
1759 | lttng_ht_add_unique_ulong(relay_connections_ht, |
1760 | &relay_connection->sock_n); | |
9d1bbf21 MD |
1761 | rcu_read_unlock(); |
1762 | return lttng_poll_add(events, | |
b8aa1682 JD |
1763 | relay_connection->sock->fd, |
1764 | LPOLLIN | LPOLLRDHUP); | |
1765 | ||
9d1bbf21 MD |
1766 | error_read: |
1767 | free(relay_connection); | |
1768 | error: | |
1769 | return -1; | |
1770 | } | |
1771 | ||
1772 | static | |
1773 | void deferred_free_connection(struct rcu_head *head) | |
1774 | { | |
1775 | struct relay_command *relay_connection = | |
1776 | caa_container_of(head, struct relay_command, rcu_node); | |
5b6d8097 DG |
1777 | |
1778 | lttcomm_destroy_sock(relay_connection->sock); | |
9d1bbf21 MD |
1779 | free(relay_connection); |
1780 | } | |
1781 | ||
1782 | static | |
1783 | void relay_del_connection(struct lttng_ht *relay_connections_ht, | |
1784 | struct lttng_ht *streams_ht, struct lttng_ht_iter *iter, | |
1785 | struct relay_command *relay_connection) | |
1786 | { | |
1787 | int ret; | |
1788 | ||
1789 | ret = lttng_ht_del(relay_connections_ht, iter); | |
1790 | assert(!ret); | |
1791 | if (relay_connection->type == RELAY_CONTROL) { | |
1792 | relay_delete_session(relay_connection, streams_ht); | |
1793 | } | |
5b6d8097 | 1794 | |
9d1bbf21 MD |
1795 | call_rcu(&relay_connection->rcu_node, |
1796 | deferred_free_connection); | |
b8aa1682 JD |
1797 | } |
1798 | ||
1799 | /* | |
1800 | * This thread does the actual work | |
1801 | */ | |
1802 | static | |
1803 | void *relay_thread_worker(void *data) | |
1804 | { | |
beaad64c DG |
1805 | int ret, err = -1, last_seen_data_fd = -1; |
1806 | uint32_t nb_fd; | |
b8aa1682 JD |
1807 | struct relay_command *relay_connection; |
1808 | struct lttng_poll_event events; | |
1809 | struct lttng_ht *relay_connections_ht; | |
1810 | struct lttng_ht_node_ulong *node; | |
1811 | struct lttng_ht_iter iter; | |
1812 | struct lttng_ht *streams_ht; | |
1813 | struct lttcomm_relayd_hdr recv_hdr; | |
1814 | ||
1815 | DBG("[thread] Relay worker started"); | |
1816 | ||
9d1bbf21 MD |
1817 | rcu_register_thread(); |
1818 | ||
b8aa1682 JD |
1819 | /* table of connections indexed on socket */ |
1820 | relay_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
095a4ae5 MD |
1821 | if (!relay_connections_ht) { |
1822 | goto relay_connections_ht_error; | |
1823 | } | |
b8aa1682 JD |
1824 | |
1825 | /* tables of streams indexed by stream ID */ | |
1826 | streams_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
095a4ae5 MD |
1827 | if (!streams_ht) { |
1828 | goto streams_ht_error; | |
1829 | } | |
b8aa1682 JD |
1830 | |
1831 | ret = create_thread_poll_set(&events, 2); | |
1832 | if (ret < 0) { | |
1833 | goto error_poll_create; | |
1834 | } | |
1835 | ||
1836 | ret = lttng_poll_add(&events, relay_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); | |
1837 | if (ret < 0) { | |
1838 | goto error; | |
1839 | } | |
1840 | ||
beaad64c | 1841 | restart: |
b8aa1682 | 1842 | while (1) { |
beaad64c DG |
1843 | int idx = -1, i, seen_control = 0, last_notdel_data_fd = -1; |
1844 | ||
b8aa1682 | 1845 | /* Infinite blocking call, waiting for transmission */ |
87c1611d | 1846 | DBG3("Relayd worker thread polling..."); |
b8aa1682 JD |
1847 | ret = lttng_poll_wait(&events, -1); |
1848 | if (ret < 0) { | |
1849 | /* | |
1850 | * Restart interrupted system call. | |
1851 | */ | |
1852 | if (errno == EINTR) { | |
1853 | goto restart; | |
1854 | } | |
1855 | goto error; | |
1856 | } | |
1857 | ||
0d9c5d77 DG |
1858 | nb_fd = ret; |
1859 | ||
beaad64c DG |
1860 | /* |
1861 | * Process control. The control connection is prioritised so we don't | |
1862 | * starve it with high throughout put tracing data on the data | |
1863 | * connection. | |
1864 | */ | |
b8aa1682 JD |
1865 | for (i = 0; i < nb_fd; i++) { |
1866 | /* Fetch once the poll data */ | |
beaad64c DG |
1867 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); |
1868 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
b8aa1682 JD |
1869 | |
1870 | /* Thread quit pipe has been closed. Killing thread. */ | |
1871 | ret = check_thread_quit_pipe(pollfd, revents); | |
1872 | if (ret) { | |
095a4ae5 MD |
1873 | err = 0; |
1874 | goto exit; | |
b8aa1682 JD |
1875 | } |
1876 | ||
1877 | /* Inspect the relay cmd pipe for new connection */ | |
1878 | if (pollfd == relay_cmd_pipe[0]) { | |
1879 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1880 | ERR("Relay pipe error"); | |
1881 | goto error; | |
1882 | } else if (revents & LPOLLIN) { | |
1883 | DBG("Relay command received"); | |
1884 | ret = relay_add_connection(relay_cmd_pipe[0], | |
1885 | &events, relay_connections_ht); | |
1886 | if (ret < 0) { | |
1887 | goto error; | |
1888 | } | |
1889 | } | |
beaad64c | 1890 | } else if (revents) { |
9d1bbf21 | 1891 | rcu_read_lock(); |
b8aa1682 JD |
1892 | lttng_ht_lookup(relay_connections_ht, |
1893 | (void *)((unsigned long) pollfd), | |
1894 | &iter); | |
1895 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1896 | if (node == NULL) { | |
1897 | DBG2("Relay sock %d not found", pollfd); | |
9d1bbf21 | 1898 | rcu_read_unlock(); |
b8aa1682 JD |
1899 | goto error; |
1900 | } | |
1901 | relay_connection = caa_container_of(node, | |
1902 | struct relay_command, sock_n); | |
1903 | ||
1904 | if (revents & (LPOLLERR)) { | |
1905 | ERR("POLL ERROR"); | |
9d1bbf21 MD |
1906 | relay_cleanup_poll_connection(&events, pollfd); |
1907 | relay_del_connection(relay_connections_ht, | |
1908 | streams_ht, &iter, | |
1909 | relay_connection); | |
beaad64c DG |
1910 | if (last_seen_data_fd == pollfd) { |
1911 | last_seen_data_fd = last_notdel_data_fd; | |
1912 | } | |
b8aa1682 JD |
1913 | } else if (revents & (LPOLLHUP | LPOLLRDHUP)) { |
1914 | DBG("Socket %d hung up", pollfd); | |
9d1bbf21 MD |
1915 | relay_cleanup_poll_connection(&events, pollfd); |
1916 | relay_del_connection(relay_connections_ht, | |
1917 | streams_ht, &iter, | |
1918 | relay_connection); | |
beaad64c DG |
1919 | if (last_seen_data_fd == pollfd) { |
1920 | last_seen_data_fd = last_notdel_data_fd; | |
1921 | } | |
b8aa1682 JD |
1922 | } else if (revents & LPOLLIN) { |
1923 | /* control socket */ | |
1924 | if (relay_connection->type == RELAY_CONTROL) { | |
1925 | ret = relay_connection->sock->ops->recvmsg( | |
1926 | relay_connection->sock, &recv_hdr, | |
7c5aef62 | 1927 | sizeof(struct lttcomm_relayd_hdr), 0); |
b8aa1682 JD |
1928 | /* connection closed */ |
1929 | if (ret <= 0) { | |
9d1bbf21 MD |
1930 | relay_cleanup_poll_connection(&events, pollfd); |
1931 | relay_del_connection(relay_connections_ht, | |
1932 | streams_ht, &iter, | |
1933 | relay_connection); | |
b8aa1682 JD |
1934 | DBG("Control connection closed with %d", pollfd); |
1935 | } else { | |
1936 | if (relay_connection->session) { | |
77c7c900 | 1937 | DBG2("Relay worker receiving data for session : %" PRIu64, |
b8aa1682 JD |
1938 | relay_connection->session->id); |
1939 | } | |
1940 | ret = relay_process_control(&recv_hdr, | |
1941 | relay_connection, | |
1942 | streams_ht); | |
b8aa1682 | 1943 | if (ret < 0) { |
beaad64c | 1944 | /* Clear the session on error. */ |
9d1bbf21 MD |
1945 | relay_cleanup_poll_connection(&events, pollfd); |
1946 | relay_del_connection(relay_connections_ht, | |
1947 | streams_ht, &iter, | |
1948 | relay_connection); | |
b8aa1682 JD |
1949 | DBG("Connection closed with %d", pollfd); |
1950 | } | |
beaad64c | 1951 | seen_control = 1; |
b8aa1682 | 1952 | } |
beaad64c DG |
1953 | } else { |
1954 | /* | |
1955 | * Flag the last seen data fd not deleted. It will be | |
1956 | * used as the last seen fd if any fd gets deleted in | |
1957 | * this first loop. | |
1958 | */ | |
1959 | last_notdel_data_fd = pollfd; | |
1960 | } | |
1961 | } | |
1962 | rcu_read_unlock(); | |
1963 | } | |
1964 | } | |
1965 | ||
1966 | /* | |
1967 | * The last loop handled a control request, go back to poll to make | |
1968 | * sure we prioritise the control socket. | |
1969 | */ | |
1970 | if (seen_control) { | |
1971 | continue; | |
1972 | } | |
1973 | ||
1974 | if (last_seen_data_fd >= 0) { | |
1975 | for (i = 0; i < nb_fd; i++) { | |
1976 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1977 | if (last_seen_data_fd == pollfd) { | |
1978 | idx = i; | |
1979 | break; | |
1980 | } | |
1981 | } | |
1982 | } | |
1983 | ||
1984 | /* Process data connection. */ | |
1985 | for (i = idx + 1; i < nb_fd; i++) { | |
1986 | /* Fetch the poll data. */ | |
1987 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1988 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1989 | ||
1990 | /* Skip the command pipe. It's handled in the first loop. */ | |
1991 | if (pollfd == relay_cmd_pipe[0]) { | |
1992 | continue; | |
1993 | } | |
1994 | ||
1995 | if (revents) { | |
1996 | rcu_read_lock(); | |
1997 | lttng_ht_lookup(relay_connections_ht, | |
1998 | (void *)((unsigned long) pollfd), | |
1999 | &iter); | |
2000 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2001 | if (node == NULL) { | |
2002 | /* Skip it. Might be removed before. */ | |
2003 | rcu_read_unlock(); | |
2004 | continue; | |
2005 | } | |
2006 | relay_connection = caa_container_of(node, | |
2007 | struct relay_command, sock_n); | |
2008 | ||
2009 | if (revents & LPOLLIN) { | |
2010 | if (relay_connection->type != RELAY_DATA) { | |
2011 | continue; | |
2012 | } | |
2013 | ||
2014 | ret = relay_process_data(relay_connection, streams_ht); | |
2015 | /* connection closed */ | |
2016 | if (ret < 0) { | |
2017 | relay_cleanup_poll_connection(&events, pollfd); | |
2018 | relay_del_connection(relay_connections_ht, | |
2019 | streams_ht, &iter, | |
2020 | relay_connection); | |
2021 | DBG("Data connection closed with %d", pollfd); | |
2022 | /* | |
2023 | * Every goto restart call sets the last seen fd where | |
2024 | * here we don't really care since we gracefully | |
2025 | * continue the loop after the connection is deleted. | |
2026 | */ | |
2027 | } else { | |
2028 | /* Keep last seen port. */ | |
2029 | last_seen_data_fd = pollfd; | |
2030 | rcu_read_unlock(); | |
2031 | goto restart; | |
b8aa1682 JD |
2032 | } |
2033 | } | |
9d1bbf21 | 2034 | rcu_read_unlock(); |
b8aa1682 JD |
2035 | } |
2036 | } | |
beaad64c | 2037 | last_seen_data_fd = -1; |
b8aa1682 JD |
2038 | } |
2039 | ||
095a4ae5 | 2040 | exit: |
b8aa1682 JD |
2041 | error: |
2042 | lttng_poll_clean(&events); | |
2043 | ||
2044 | /* empty the hash table and free the memory */ | |
9d1bbf21 | 2045 | rcu_read_lock(); |
b8aa1682 JD |
2046 | cds_lfht_for_each_entry(relay_connections_ht->ht, &iter.iter, node, node) { |
2047 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2048 | if (node) { | |
2049 | relay_connection = caa_container_of(node, | |
2050 | struct relay_command, sock_n); | |
9d1bbf21 MD |
2051 | relay_del_connection(relay_connections_ht, |
2052 | streams_ht, &iter, | |
2053 | relay_connection); | |
b8aa1682 | 2054 | } |
b8aa1682 | 2055 | } |
9d1bbf21 | 2056 | rcu_read_unlock(); |
b8aa1682 | 2057 | error_poll_create: |
095a4ae5 MD |
2058 | lttng_ht_destroy(streams_ht); |
2059 | streams_ht_error: | |
b8aa1682 | 2060 | lttng_ht_destroy(relay_connections_ht); |
095a4ae5 | 2061 | relay_connections_ht_error: |
6620da75 DG |
2062 | /* Close relay cmd pipes */ |
2063 | utils_close_pipe(relay_cmd_pipe); | |
095a4ae5 MD |
2064 | if (err) { |
2065 | DBG("Thread exited with error"); | |
2066 | } | |
b8aa1682 | 2067 | DBG("Worker thread cleanup complete"); |
095a4ae5 | 2068 | free(data_buffer); |
b8aa1682 | 2069 | stop_threads(); |
9d1bbf21 | 2070 | rcu_unregister_thread(); |
b8aa1682 JD |
2071 | return NULL; |
2072 | } | |
2073 | ||
2074 | /* | |
2075 | * Create the relay command pipe to wake thread_manage_apps. | |
2076 | * Closed in cleanup(). | |
2077 | */ | |
2078 | static int create_relay_cmd_pipe(void) | |
2079 | { | |
a02de639 | 2080 | int ret; |
b8aa1682 | 2081 | |
a02de639 | 2082 | ret = utils_create_pipe_cloexec(relay_cmd_pipe); |
b8aa1682 | 2083 | |
b8aa1682 JD |
2084 | return ret; |
2085 | } | |
2086 | ||
2087 | /* | |
2088 | * main | |
2089 | */ | |
2090 | int main(int argc, char **argv) | |
2091 | { | |
2092 | int ret = 0; | |
2093 | void *status; | |
2094 | ||
2095 | /* Create thread quit pipe */ | |
2096 | if ((ret = init_thread_quit_pipe()) < 0) { | |
2097 | goto error; | |
2098 | } | |
2099 | ||
2100 | /* Parse arguments */ | |
2101 | progname = argv[0]; | |
c617c0c6 | 2102 | if ((ret = parse_args(argc, argv)) < 0) { |
a02de639 | 2103 | goto exit; |
b8aa1682 JD |
2104 | } |
2105 | ||
2106 | if ((ret = set_signal_handler()) < 0) { | |
2107 | goto exit; | |
2108 | } | |
2109 | ||
4d513a50 DG |
2110 | /* Try to create directory if -o, --output is specified. */ |
2111 | if (opt_output_path) { | |
2112 | ret = utils_mkdir_recursive(opt_output_path, S_IRWXU | S_IRWXG); | |
2113 | if (ret < 0) { | |
2114 | ERR("Unable to create %s", opt_output_path); | |
2115 | goto exit; | |
2116 | } | |
2117 | } | |
2118 | ||
b8aa1682 JD |
2119 | /* Daemonize */ |
2120 | if (opt_daemon) { | |
2121 | ret = daemon(0, 0); | |
2122 | if (ret < 0) { | |
2123 | PERROR("daemon"); | |
a02de639 | 2124 | goto exit; |
b8aa1682 JD |
2125 | } |
2126 | } | |
2127 | ||
2128 | /* Check if daemon is UID = 0 */ | |
2129 | is_root = !getuid(); | |
2130 | ||
2131 | if (!is_root) { | |
2132 | if (control_uri->port < 1024 || data_uri->port < 1024) { | |
2133 | ERR("Need to be root to use ports < 1024"); | |
2134 | ret = -1; | |
a02de639 | 2135 | goto exit; |
b8aa1682 JD |
2136 | } |
2137 | } | |
2138 | ||
2139 | /* Setup the thread apps communication pipe. */ | |
2140 | if ((ret = create_relay_cmd_pipe()) < 0) { | |
2141 | goto exit; | |
2142 | } | |
2143 | ||
2144 | /* Init relay command queue. */ | |
2145 | cds_wfq_init(&relay_cmd_queue.queue); | |
2146 | ||
2147 | /* Set up max poll set size */ | |
2148 | lttng_poll_set_max_size(); | |
2149 | ||
2150 | /* Setup the dispatcher thread */ | |
2151 | ret = pthread_create(&dispatcher_thread, NULL, | |
2152 | relay_thread_dispatcher, (void *) NULL); | |
2153 | if (ret != 0) { | |
2154 | PERROR("pthread_create dispatcher"); | |
2155 | goto exit_dispatcher; | |
2156 | } | |
2157 | ||
2158 | /* Setup the worker thread */ | |
2159 | ret = pthread_create(&worker_thread, NULL, | |
2160 | relay_thread_worker, (void *) NULL); | |
2161 | if (ret != 0) { | |
2162 | PERROR("pthread_create worker"); | |
2163 | goto exit_worker; | |
2164 | } | |
2165 | ||
2166 | /* Setup the listener thread */ | |
2167 | ret = pthread_create(&listener_thread, NULL, | |
2168 | relay_thread_listener, (void *) NULL); | |
2169 | if (ret != 0) { | |
2170 | PERROR("pthread_create listener"); | |
2171 | goto exit_listener; | |
2172 | } | |
2173 | ||
2174 | exit_listener: | |
2175 | ret = pthread_join(listener_thread, &status); | |
2176 | if (ret != 0) { | |
2177 | PERROR("pthread_join"); | |
2178 | goto error; /* join error, exit without cleanup */ | |
2179 | } | |
2180 | ||
2181 | exit_worker: | |
2182 | ret = pthread_join(worker_thread, &status); | |
2183 | if (ret != 0) { | |
2184 | PERROR("pthread_join"); | |
2185 | goto error; /* join error, exit without cleanup */ | |
2186 | } | |
2187 | ||
2188 | exit_dispatcher: | |
2189 | ret = pthread_join(dispatcher_thread, &status); | |
2190 | if (ret != 0) { | |
2191 | PERROR("pthread_join"); | |
2192 | goto error; /* join error, exit without cleanup */ | |
2193 | } | |
2194 | ||
2195 | exit: | |
2196 | cleanup(); | |
2197 | if (!ret) { | |
2198 | exit(EXIT_SUCCESS); | |
2199 | } | |
a02de639 | 2200 | |
b8aa1682 JD |
2201 | error: |
2202 | exit(EXIT_FAILURE); | |
2203 | } |