Commit | Line | Data |
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2f77fc4b DG |
1 | /* |
2 | * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License, version 2 only, as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
18 | #define _GNU_SOURCE | |
19 | #include <assert.h> | |
20 | #include <urcu/list.h> | |
21 | #include <urcu/uatomic.h> | |
22 | ||
23 | #include <common/defaults.h> | |
24 | #include <common/common.h> | |
25 | #include <common/sessiond-comm/sessiond-comm.h> | |
26 | #include <common/relayd/relayd.h> | |
27 | ||
28 | #include "channel.h" | |
29 | #include "consumer.h" | |
30 | #include "event.h" | |
31 | #include "kernel.h" | |
32 | #include "kernel-consumer.h" | |
33 | #include "lttng-sessiond.h" | |
34 | #include "utils.h" | |
35 | ||
36 | #include "cmd.h" | |
37 | ||
38 | /* | |
39 | * Used to keep a unique index for each relayd socket created where this value | |
40 | * is associated with streams on the consumer so it can match the right relayd | |
41 | * to send to. | |
42 | * | |
43 | * This value should be incremented atomically for safety purposes and future | |
44 | * possible concurrent access. | |
45 | */ | |
46 | static unsigned int relayd_net_seq_idx; | |
47 | ||
48 | /* | |
49 | * Create a session path used by list_lttng_sessions for the case that the | |
50 | * session consumer is on the network. | |
51 | */ | |
52 | static int build_network_session_path(char *dst, size_t size, | |
53 | struct ltt_session *session) | |
54 | { | |
55 | int ret, kdata_port, udata_port; | |
56 | struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL; | |
57 | char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX]; | |
58 | ||
59 | assert(session); | |
60 | assert(dst); | |
61 | ||
62 | memset(tmp_urls, 0, sizeof(tmp_urls)); | |
63 | memset(tmp_uurl, 0, sizeof(tmp_uurl)); | |
64 | ||
65 | kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT; | |
66 | ||
67 | if (session->kernel_session && session->kernel_session->consumer) { | |
68 | kuri = &session->kernel_session->consumer->dst.net.control; | |
69 | kdata_port = session->kernel_session->consumer->dst.net.data.port; | |
70 | } | |
71 | ||
72 | if (session->ust_session && session->ust_session->consumer) { | |
73 | uuri = &session->ust_session->consumer->dst.net.control; | |
74 | udata_port = session->ust_session->consumer->dst.net.data.port; | |
75 | } | |
76 | ||
77 | if (uuri == NULL && kuri == NULL) { | |
78 | uri = &session->consumer->dst.net.control; | |
79 | kdata_port = session->consumer->dst.net.data.port; | |
80 | } else if (kuri && uuri) { | |
81 | ret = uri_compare(kuri, uuri); | |
82 | if (ret) { | |
83 | /* Not Equal */ | |
84 | uri = kuri; | |
85 | /* Build uuri URL string */ | |
86 | ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl)); | |
87 | if (ret < 0) { | |
88 | goto error; | |
89 | } | |
90 | } else { | |
91 | uri = kuri; | |
92 | } | |
93 | } else if (kuri && uuri == NULL) { | |
94 | uri = kuri; | |
95 | } else if (uuri && kuri == NULL) { | |
96 | uri = uuri; | |
97 | } | |
98 | ||
99 | ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls)); | |
100 | if (ret < 0) { | |
101 | goto error; | |
102 | } | |
103 | ||
104 | if (strlen(tmp_uurl) > 0) { | |
105 | ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]", | |
106 | tmp_urls, kdata_port, tmp_uurl, udata_port); | |
107 | } else { | |
108 | ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, kdata_port); | |
109 | } | |
110 | ||
111 | error: | |
112 | return ret; | |
113 | } | |
114 | ||
115 | /* | |
116 | * Fill lttng_channel array of all channels. | |
117 | */ | |
118 | static void list_lttng_channels(int domain, struct ltt_session *session, | |
119 | struct lttng_channel *channels) | |
120 | { | |
121 | int i = 0; | |
122 | struct ltt_kernel_channel *kchan; | |
123 | ||
124 | DBG("Listing channels for session %s", session->name); | |
125 | ||
126 | switch (domain) { | |
127 | case LTTNG_DOMAIN_KERNEL: | |
128 | /* Kernel channels */ | |
129 | if (session->kernel_session != NULL) { | |
130 | cds_list_for_each_entry(kchan, | |
131 | &session->kernel_session->channel_list.head, list) { | |
132 | /* Copy lttng_channel struct to array */ | |
133 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
134 | channels[i].enabled = kchan->enabled; | |
135 | i++; | |
136 | } | |
137 | } | |
138 | break; | |
139 | case LTTNG_DOMAIN_UST: | |
140 | { | |
141 | struct lttng_ht_iter iter; | |
142 | struct ltt_ust_channel *uchan; | |
143 | ||
144 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, | |
145 | &iter.iter, uchan, node.node) { | |
146 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); | |
147 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
148 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
149 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
150 | channels[i].attr.switch_timer_interval = | |
151 | uchan->attr.switch_timer_interval; | |
152 | channels[i].attr.read_timer_interval = | |
153 | uchan->attr.read_timer_interval; | |
154 | channels[i].enabled = uchan->enabled; | |
155 | switch (uchan->attr.output) { | |
156 | case LTTNG_UST_MMAP: | |
157 | default: | |
158 | channels[i].attr.output = LTTNG_EVENT_MMAP; | |
159 | break; | |
160 | } | |
161 | i++; | |
162 | } | |
163 | break; | |
164 | } | |
165 | default: | |
166 | break; | |
167 | } | |
168 | } | |
169 | ||
170 | /* | |
171 | * Create a list of ust global domain events. | |
172 | */ | |
173 | static int list_lttng_ust_global_events(char *channel_name, | |
174 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
175 | { | |
176 | int i = 0, ret = 0; | |
177 | unsigned int nb_event = 0; | |
178 | struct lttng_ht_iter iter; | |
179 | struct lttng_ht_node_str *node; | |
180 | struct ltt_ust_channel *uchan; | |
181 | struct ltt_ust_event *uevent; | |
182 | struct lttng_event *tmp; | |
183 | ||
184 | DBG("Listing UST global events for channel %s", channel_name); | |
185 | ||
186 | rcu_read_lock(); | |
187 | ||
188 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); | |
189 | node = lttng_ht_iter_get_node_str(&iter); | |
190 | if (node == NULL) { | |
191 | ret = -LTTCOMM_UST_CHAN_NOT_FOUND; | |
192 | goto error; | |
193 | } | |
194 | ||
195 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); | |
196 | ||
197 | nb_event += lttng_ht_get_count(uchan->events); | |
198 | ||
199 | if (nb_event == 0) { | |
200 | ret = nb_event; | |
201 | goto error; | |
202 | } | |
203 | ||
204 | DBG3("Listing UST global %d events", nb_event); | |
205 | ||
206 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
207 | if (tmp == NULL) { | |
208 | ret = -LTTCOMM_FATAL; | |
209 | goto error; | |
210 | } | |
211 | ||
212 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { | |
213 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); | |
214 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
215 | tmp[i].enabled = uevent->enabled; | |
216 | ||
217 | switch (uevent->attr.instrumentation) { | |
218 | case LTTNG_UST_TRACEPOINT: | |
219 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
220 | break; | |
221 | case LTTNG_UST_PROBE: | |
222 | tmp[i].type = LTTNG_EVENT_PROBE; | |
223 | break; | |
224 | case LTTNG_UST_FUNCTION: | |
225 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
226 | break; | |
227 | } | |
228 | ||
229 | tmp[i].loglevel = uevent->attr.loglevel; | |
230 | switch (uevent->attr.loglevel_type) { | |
231 | case LTTNG_UST_LOGLEVEL_ALL: | |
232 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
233 | break; | |
234 | case LTTNG_UST_LOGLEVEL_RANGE: | |
235 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; | |
236 | break; | |
237 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
238 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; | |
239 | break; | |
240 | } | |
241 | if (uevent->filter) { | |
242 | tmp[i].filter = 1; | |
243 | } | |
244 | i++; | |
245 | } | |
246 | ||
247 | ret = nb_event; | |
248 | *events = tmp; | |
249 | ||
250 | error: | |
251 | rcu_read_unlock(); | |
252 | return ret; | |
253 | } | |
254 | ||
255 | /* | |
256 | * Fill lttng_event array of all kernel events in the channel. | |
257 | */ | |
258 | static int list_lttng_kernel_events(char *channel_name, | |
259 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
260 | { | |
261 | int i = 0, ret; | |
262 | unsigned int nb_event; | |
263 | struct ltt_kernel_event *event; | |
264 | struct ltt_kernel_channel *kchan; | |
265 | ||
266 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
267 | if (kchan == NULL) { | |
268 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
269 | goto error; | |
270 | } | |
271 | ||
272 | nb_event = kchan->event_count; | |
273 | ||
274 | DBG("Listing events for channel %s", kchan->channel->name); | |
275 | ||
276 | if (nb_event == 0) { | |
277 | ret = nb_event; | |
278 | goto error; | |
279 | } | |
280 | ||
281 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
282 | if (*events == NULL) { | |
283 | ret = LTTCOMM_FATAL; | |
284 | goto error; | |
285 | } | |
286 | ||
287 | /* Kernel channels */ | |
288 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
289 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
290 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
291 | (*events)[i].enabled = event->enabled; | |
292 | ||
293 | switch (event->event->instrumentation) { | |
294 | case LTTNG_KERNEL_TRACEPOINT: | |
295 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; | |
296 | break; | |
297 | case LTTNG_KERNEL_KPROBE: | |
298 | case LTTNG_KERNEL_KRETPROBE: | |
299 | (*events)[i].type = LTTNG_EVENT_PROBE; | |
300 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
301 | sizeof(struct lttng_kernel_kprobe)); | |
302 | break; | |
303 | case LTTNG_KERNEL_FUNCTION: | |
304 | (*events)[i].type = LTTNG_EVENT_FUNCTION; | |
305 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
306 | sizeof(struct lttng_kernel_function)); | |
307 | break; | |
308 | case LTTNG_KERNEL_NOOP: | |
309 | (*events)[i].type = LTTNG_EVENT_NOOP; | |
310 | break; | |
311 | case LTTNG_KERNEL_SYSCALL: | |
312 | (*events)[i].type = LTTNG_EVENT_SYSCALL; | |
313 | break; | |
314 | case LTTNG_KERNEL_ALL: | |
315 | assert(0); | |
316 | break; | |
317 | } | |
318 | i++; | |
319 | } | |
320 | ||
321 | return nb_event; | |
322 | ||
323 | error: | |
324 | return ret; | |
325 | } | |
326 | ||
327 | /* | |
328 | * Add URI so the consumer output object. Set the correct path depending on the | |
329 | * domain adding the default trace directory. | |
330 | */ | |
331 | static int add_uri_to_consumer(struct consumer_output *consumer, | |
332 | struct lttng_uri *uri, int domain, const char *session_name) | |
333 | { | |
334 | int ret = LTTCOMM_OK; | |
335 | const char *default_trace_dir; | |
336 | ||
337 | assert(uri); | |
338 | ||
339 | if (consumer == NULL) { | |
340 | DBG("No consumer detected. Don't add URI. Stopping."); | |
341 | ret = LTTCOMM_NO_CONSUMER; | |
342 | goto error; | |
343 | } | |
344 | ||
345 | switch (domain) { | |
346 | case LTTNG_DOMAIN_KERNEL: | |
347 | default_trace_dir = DEFAULT_KERNEL_TRACE_DIR; | |
348 | break; | |
349 | case LTTNG_DOMAIN_UST: | |
350 | default_trace_dir = DEFAULT_UST_TRACE_DIR; | |
351 | break; | |
352 | default: | |
353 | /* | |
354 | * This case is possible is we try to add the URI to the global tracing | |
355 | * session consumer object which in this case there is no subdir. | |
356 | */ | |
357 | default_trace_dir = ""; | |
358 | } | |
359 | ||
360 | switch (uri->dtype) { | |
361 | case LTTNG_DST_IPV4: | |
362 | case LTTNG_DST_IPV6: | |
363 | DBG2("Setting network URI to consumer"); | |
364 | ||
365 | /* Set URI into consumer output object */ | |
366 | ret = consumer_set_network_uri(consumer, uri); | |
367 | if (ret < 0) { | |
368 | ret = LTTCOMM_FATAL; | |
369 | goto error; | |
370 | } else if (ret == 1) { | |
371 | /* | |
372 | * URI was the same in the consumer so we do not append the subdir | |
373 | * again so to not duplicate output dir. | |
374 | */ | |
375 | goto error; | |
376 | } | |
377 | ||
378 | if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) { | |
379 | ret = consumer_set_subdir(consumer, session_name); | |
380 | if (ret < 0) { | |
381 | ret = LTTCOMM_FATAL; | |
382 | goto error; | |
383 | } | |
384 | } | |
385 | ||
386 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
387 | /* On a new subdir, reappend the default trace dir. */ | |
388 | strncat(consumer->subdir, default_trace_dir, sizeof(consumer->subdir)); | |
389 | DBG3("Append domain trace name to subdir %s", consumer->subdir); | |
390 | } | |
391 | ||
392 | break; | |
393 | case LTTNG_DST_PATH: | |
394 | DBG2("Setting trace directory path from URI to %s", uri->dst.path); | |
395 | memset(consumer->dst.trace_path, 0, | |
396 | sizeof(consumer->dst.trace_path)); | |
397 | strncpy(consumer->dst.trace_path, uri->dst.path, | |
398 | sizeof(consumer->dst.trace_path)); | |
399 | /* Append default trace dir */ | |
400 | strncat(consumer->dst.trace_path, default_trace_dir, | |
401 | sizeof(consumer->dst.trace_path)); | |
402 | /* Flag consumer as local. */ | |
403 | consumer->type = CONSUMER_DST_LOCAL; | |
404 | break; | |
405 | } | |
406 | ||
407 | error: | |
408 | return ret; | |
409 | } | |
410 | ||
411 | /* | |
412 | * Init tracing by creating trace directory and sending fds kernel consumer. | |
413 | */ | |
414 | static int init_kernel_tracing(struct ltt_kernel_session *session) | |
415 | { | |
416 | int ret = 0; | |
417 | struct lttng_ht_iter iter; | |
418 | struct consumer_socket *socket; | |
419 | ||
420 | assert(session); | |
421 | ||
422 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { | |
423 | cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter, | |
424 | socket, node.node) { | |
425 | /* Code flow error */ | |
426 | assert(socket->fd >= 0); | |
427 | ||
428 | pthread_mutex_lock(socket->lock); | |
429 | ret = kernel_consumer_send_session(socket->fd, session); | |
430 | pthread_mutex_unlock(socket->lock); | |
431 | if (ret < 0) { | |
432 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
433 | goto error; | |
434 | } | |
435 | } | |
436 | } | |
437 | ||
438 | error: | |
439 | return ret; | |
440 | } | |
441 | ||
442 | /* | |
443 | * Create a socket to the relayd using the URI. | |
444 | * | |
445 | * On success, the relayd_sock pointer is set to the created socket. | |
446 | * Else, it's stays untouched and a lttcomm error code is returned. | |
447 | */ | |
448 | static int create_connect_relayd(struct consumer_output *output, | |
449 | const char *session_name, struct lttng_uri *uri, | |
450 | struct lttcomm_sock **relayd_sock) | |
451 | { | |
452 | int ret; | |
453 | struct lttcomm_sock *sock; | |
454 | ||
455 | /* Create socket object from URI */ | |
456 | sock = lttcomm_alloc_sock_from_uri(uri); | |
457 | if (sock == NULL) { | |
458 | ret = LTTCOMM_FATAL; | |
459 | goto error; | |
460 | } | |
461 | ||
462 | ret = lttcomm_create_sock(sock); | |
463 | if (ret < 0) { | |
464 | ret = LTTCOMM_FATAL; | |
465 | goto error; | |
466 | } | |
467 | ||
468 | /* Connect to relayd so we can proceed with a session creation. */ | |
469 | ret = relayd_connect(sock); | |
470 | if (ret < 0) { | |
471 | ERR("Unable to reach lttng-relayd"); | |
472 | ret = LTTCOMM_RELAYD_SESSION_FAIL; | |
473 | goto free_sock; | |
474 | } | |
475 | ||
476 | /* Create socket for control stream. */ | |
477 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
478 | DBG3("Creating relayd stream socket from URI"); | |
479 | ||
480 | /* Check relayd version */ | |
481 | ret = relayd_version_check(sock, RELAYD_VERSION_COMM_MAJOR, | |
482 | RELAYD_VERSION_COMM_MINOR); | |
483 | if (ret < 0) { | |
484 | ret = LTTCOMM_RELAYD_VERSION_FAIL; | |
485 | goto close_sock; | |
486 | } | |
487 | } else if (uri->stype == LTTNG_STREAM_DATA) { | |
488 | DBG3("Creating relayd data socket from URI"); | |
489 | } else { | |
490 | /* Command is not valid */ | |
491 | ERR("Relayd invalid stream type: %d", uri->stype); | |
492 | ret = LTTCOMM_INVALID; | |
493 | goto close_sock; | |
494 | } | |
495 | ||
496 | *relayd_sock = sock; | |
497 | ||
498 | return LTTCOMM_OK; | |
499 | ||
500 | close_sock: | |
501 | if (sock) { | |
502 | (void) relayd_close(sock); | |
503 | } | |
504 | free_sock: | |
505 | if (sock) { | |
506 | lttcomm_destroy_sock(sock); | |
507 | } | |
508 | error: | |
509 | return ret; | |
510 | } | |
511 | ||
512 | /* | |
513 | * Connect to the relayd using URI and send the socket to the right consumer. | |
514 | */ | |
515 | static int send_consumer_relayd_socket(int domain, struct ltt_session *session, | |
516 | struct lttng_uri *relayd_uri, struct consumer_output *consumer, | |
517 | int consumer_fd) | |
518 | { | |
519 | int ret; | |
520 | struct lttcomm_sock *sock = NULL; | |
521 | ||
522 | /* Set the network sequence index if not set. */ | |
523 | if (consumer->net_seq_index == -1) { | |
524 | /* | |
525 | * Increment net_seq_idx because we are about to transfer the | |
526 | * new relayd socket to the consumer. | |
527 | */ | |
528 | uatomic_inc(&relayd_net_seq_idx); | |
529 | /* Assign unique key so the consumer can match streams */ | |
530 | uatomic_set(&consumer->net_seq_index, | |
531 | uatomic_read(&relayd_net_seq_idx)); | |
532 | } | |
533 | ||
534 | /* Connect to relayd and make version check if uri is the control. */ | |
535 | ret = create_connect_relayd(consumer, session->name, relayd_uri, &sock); | |
536 | if (ret != LTTCOMM_OK) { | |
537 | goto close_sock; | |
538 | } | |
539 | ||
540 | /* If the control socket is connected, network session is ready */ | |
541 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
542 | session->net_handle = 1; | |
543 | } | |
544 | ||
545 | /* Send relayd socket to consumer. */ | |
546 | ret = consumer_send_relayd_socket(consumer_fd, sock, | |
547 | consumer, relayd_uri->stype); | |
548 | if (ret < 0) { | |
549 | ret = LTTCOMM_ENABLE_CONSUMER_FAIL; | |
550 | goto close_sock; | |
551 | } | |
552 | ||
553 | ret = LTTCOMM_OK; | |
554 | ||
555 | /* | |
556 | * Close socket which was dup on the consumer side. The session daemon does | |
557 | * NOT keep track of the relayd socket(s) once transfer to the consumer. | |
558 | */ | |
559 | ||
560 | close_sock: | |
561 | if (sock) { | |
562 | (void) relayd_close(sock); | |
563 | lttcomm_destroy_sock(sock); | |
564 | } | |
565 | ||
566 | return ret; | |
567 | } | |
568 | ||
569 | /* | |
570 | * Send both relayd sockets to a specific consumer and domain. This is a | |
571 | * helper function to facilitate sending the information to the consumer for a | |
572 | * session. | |
573 | */ | |
574 | static int send_consumer_relayd_sockets(int domain, | |
575 | struct ltt_session *session, struct consumer_output *consumer, int fd) | |
576 | { | |
577 | int ret; | |
578 | ||
579 | assert(session); | |
580 | assert(consumer); | |
581 | ||
582 | /* Don't resend the sockets to the consumer. */ | |
583 | if (consumer->dst.net.relayd_socks_sent) { | |
584 | ret = LTTCOMM_OK; | |
585 | goto error; | |
586 | } | |
587 | ||
588 | /* Sending control relayd socket. */ | |
589 | ret = send_consumer_relayd_socket(domain, session, | |
590 | &consumer->dst.net.control, consumer, fd); | |
591 | if (ret != LTTCOMM_OK) { | |
592 | goto error; | |
593 | } | |
594 | ||
595 | /* Sending data relayd socket. */ | |
596 | ret = send_consumer_relayd_socket(domain, session, | |
597 | &consumer->dst.net.data, consumer, fd); | |
598 | if (ret != LTTCOMM_OK) { | |
599 | goto error; | |
600 | } | |
601 | ||
602 | /* Flag that all relayd sockets were sent to the consumer. */ | |
603 | consumer->dst.net.relayd_socks_sent = 1; | |
604 | ||
605 | error: | |
606 | return ret; | |
607 | } | |
608 | ||
609 | /* | |
610 | * Setup relayd connections for a tracing session. First creates the socket to | |
611 | * the relayd and send them to the right domain consumer. Consumer type MUST be | |
612 | * network. | |
613 | */ | |
614 | static int setup_relayd(struct ltt_session *session) | |
615 | { | |
616 | int ret = LTTCOMM_OK; | |
617 | struct ltt_ust_session *usess; | |
618 | struct ltt_kernel_session *ksess; | |
619 | struct consumer_socket *socket; | |
620 | struct lttng_ht_iter iter; | |
621 | ||
622 | assert(session); | |
623 | ||
624 | usess = session->ust_session; | |
625 | ksess = session->kernel_session; | |
626 | ||
627 | DBG2("Setting relayd for session %s", session->name); | |
628 | ||
629 | if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET | |
630 | && usess->consumer->enabled) { | |
631 | /* For each consumer socket, send relayd sockets */ | |
632 | cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, | |
633 | socket, node.node) { | |
634 | /* Code flow error */ | |
635 | assert(socket->fd >= 0); | |
636 | ||
637 | pthread_mutex_lock(socket->lock); | |
638 | send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session, | |
639 | usess->consumer, socket->fd); | |
640 | pthread_mutex_unlock(socket->lock); | |
641 | if (ret != LTTCOMM_OK) { | |
642 | goto error; | |
643 | } | |
644 | } | |
645 | } | |
646 | ||
647 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET | |
648 | && ksess->consumer->enabled) { | |
649 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
650 | socket, node.node) { | |
651 | /* Code flow error */ | |
652 | assert(socket->fd >= 0); | |
653 | ||
654 | pthread_mutex_lock(socket->lock); | |
655 | send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session, | |
656 | ksess->consumer, socket->fd); | |
657 | pthread_mutex_unlock(socket->lock); | |
658 | if (ret != LTTCOMM_OK) { | |
659 | goto error; | |
660 | } | |
661 | } | |
662 | } | |
663 | ||
664 | error: | |
665 | return ret; | |
666 | } | |
667 | ||
668 | /* | |
669 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. | |
670 | */ | |
671 | int cmd_disable_channel(struct ltt_session *session, int domain, | |
672 | char *channel_name) | |
673 | { | |
674 | int ret; | |
675 | struct ltt_ust_session *usess; | |
676 | ||
677 | usess = session->ust_session; | |
678 | ||
679 | switch (domain) { | |
680 | case LTTNG_DOMAIN_KERNEL: | |
681 | { | |
682 | ret = channel_kernel_disable(session->kernel_session, | |
683 | channel_name); | |
684 | if (ret != LTTCOMM_OK) { | |
685 | goto error; | |
686 | } | |
687 | ||
688 | kernel_wait_quiescent(kernel_tracer_fd); | |
689 | break; | |
690 | } | |
691 | case LTTNG_DOMAIN_UST: | |
692 | { | |
693 | struct ltt_ust_channel *uchan; | |
694 | struct lttng_ht *chan_ht; | |
695 | ||
696 | chan_ht = usess->domain_global.channels; | |
697 | ||
698 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
699 | if (uchan == NULL) { | |
700 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
701 | goto error; | |
702 | } | |
703 | ||
704 | ret = channel_ust_disable(usess, domain, uchan); | |
705 | if (ret != LTTCOMM_OK) { | |
706 | goto error; | |
707 | } | |
708 | break; | |
709 | } | |
710 | #if 0 | |
711 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
712 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
713 | case LTTNG_DOMAIN_UST_PID: | |
714 | #endif | |
715 | default: | |
716 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
717 | goto error; | |
718 | } | |
719 | ||
720 | ret = LTTCOMM_OK; | |
721 | ||
722 | error: | |
723 | return ret; | |
724 | } | |
725 | ||
726 | /* | |
727 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
728 | * | |
729 | * The wpipe arguments is used as a notifier for the kernel thread. | |
730 | */ | |
731 | int cmd_enable_channel(struct ltt_session *session, | |
732 | int domain, struct lttng_channel *attr, int wpipe) | |
733 | { | |
734 | int ret; | |
735 | struct ltt_ust_session *usess = session->ust_session; | |
736 | struct lttng_ht *chan_ht; | |
737 | ||
738 | assert(session); | |
739 | assert(attr); | |
740 | ||
741 | DBG("Enabling channel %s for session %s", attr->name, session->name); | |
742 | ||
743 | switch (domain) { | |
744 | case LTTNG_DOMAIN_KERNEL: | |
745 | { | |
746 | struct ltt_kernel_channel *kchan; | |
747 | ||
748 | /* Mandatory for a kernel channel. */ | |
749 | assert(wpipe > 0); | |
750 | ||
751 | kchan = trace_kernel_get_channel_by_name(attr->name, | |
752 | session->kernel_session); | |
753 | if (kchan == NULL) { | |
754 | ret = channel_kernel_create(session->kernel_session, attr, wpipe); | |
755 | } else { | |
756 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
757 | } | |
758 | ||
759 | if (ret != LTTCOMM_OK) { | |
760 | goto error; | |
761 | } | |
762 | ||
763 | kernel_wait_quiescent(kernel_tracer_fd); | |
764 | break; | |
765 | } | |
766 | case LTTNG_DOMAIN_UST: | |
767 | { | |
768 | struct ltt_ust_channel *uchan; | |
769 | ||
770 | chan_ht = usess->domain_global.channels; | |
771 | ||
772 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); | |
773 | if (uchan == NULL) { | |
774 | ret = channel_ust_create(usess, domain, attr); | |
775 | } else { | |
776 | ret = channel_ust_enable(usess, domain, uchan); | |
777 | } | |
778 | break; | |
779 | } | |
780 | #if 0 | |
781 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
782 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
783 | case LTTNG_DOMAIN_UST_PID: | |
784 | #endif | |
785 | default: | |
786 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
787 | goto error; | |
788 | } | |
789 | ||
790 | error: | |
791 | return ret; | |
792 | } | |
793 | ||
794 | ||
795 | /* | |
796 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
797 | */ | |
798 | int cmd_disable_event(struct ltt_session *session, int domain, | |
799 | char *channel_name, char *event_name) | |
800 | { | |
801 | int ret; | |
802 | ||
803 | switch (domain) { | |
804 | case LTTNG_DOMAIN_KERNEL: | |
805 | { | |
806 | struct ltt_kernel_channel *kchan; | |
807 | struct ltt_kernel_session *ksess; | |
808 | ||
809 | ksess = session->kernel_session; | |
810 | ||
811 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
812 | if (kchan == NULL) { | |
813 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
814 | goto error; | |
815 | } | |
816 | ||
817 | ret = event_kernel_disable_tracepoint(ksess, kchan, event_name); | |
818 | if (ret != LTTCOMM_OK) { | |
819 | goto error; | |
820 | } | |
821 | ||
822 | kernel_wait_quiescent(kernel_tracer_fd); | |
823 | break; | |
824 | } | |
825 | case LTTNG_DOMAIN_UST: | |
826 | { | |
827 | struct ltt_ust_channel *uchan; | |
828 | struct ltt_ust_session *usess; | |
829 | ||
830 | usess = session->ust_session; | |
831 | ||
832 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
833 | channel_name); | |
834 | if (uchan == NULL) { | |
835 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
836 | goto error; | |
837 | } | |
838 | ||
839 | ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name); | |
840 | if (ret != LTTCOMM_OK) { | |
841 | goto error; | |
842 | } | |
843 | ||
844 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
845 | channel_name); | |
846 | break; | |
847 | } | |
848 | #if 0 | |
849 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
850 | case LTTNG_DOMAIN_UST_PID: | |
851 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
852 | #endif | |
853 | default: | |
854 | ret = LTTCOMM_UND; | |
855 | goto error; | |
856 | } | |
857 | ||
858 | ret = LTTCOMM_OK; | |
859 | ||
860 | error: | |
861 | return ret; | |
862 | } | |
863 | ||
864 | /* | |
865 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
866 | */ | |
867 | int cmd_disable_event_all(struct ltt_session *session, int domain, | |
868 | char *channel_name) | |
869 | { | |
870 | int ret; | |
871 | ||
872 | switch (domain) { | |
873 | case LTTNG_DOMAIN_KERNEL: | |
874 | { | |
875 | struct ltt_kernel_session *ksess; | |
876 | struct ltt_kernel_channel *kchan; | |
877 | ||
878 | ksess = session->kernel_session; | |
879 | ||
880 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
881 | if (kchan == NULL) { | |
882 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
883 | goto error; | |
884 | } | |
885 | ||
886 | ret = event_kernel_disable_all(ksess, kchan); | |
887 | if (ret != LTTCOMM_OK) { | |
888 | goto error; | |
889 | } | |
890 | ||
891 | kernel_wait_quiescent(kernel_tracer_fd); | |
892 | break; | |
893 | } | |
894 | case LTTNG_DOMAIN_UST: | |
895 | { | |
896 | struct ltt_ust_session *usess; | |
897 | struct ltt_ust_channel *uchan; | |
898 | ||
899 | usess = session->ust_session; | |
900 | ||
901 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
902 | channel_name); | |
903 | if (uchan == NULL) { | |
904 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
905 | goto error; | |
906 | } | |
907 | ||
908 | ret = event_ust_disable_all_tracepoints(usess, domain, uchan); | |
909 | if (ret != 0) { | |
910 | goto error; | |
911 | } | |
912 | ||
913 | DBG3("Disable all UST events in channel %s completed", channel_name); | |
914 | ||
915 | break; | |
916 | } | |
917 | #if 0 | |
918 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
919 | case LTTNG_DOMAIN_UST_PID: | |
920 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
921 | #endif | |
922 | default: | |
923 | ret = LTTCOMM_UND; | |
924 | goto error; | |
925 | } | |
926 | ||
927 | ret = LTTCOMM_OK; | |
928 | ||
929 | error: | |
930 | return ret; | |
931 | } | |
932 | ||
933 | /* | |
934 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
935 | */ | |
936 | int cmd_add_context(struct ltt_session *session, int domain, | |
937 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
938 | { | |
939 | int ret; | |
940 | ||
941 | switch (domain) { | |
942 | case LTTNG_DOMAIN_KERNEL: | |
943 | /* Add kernel context to kernel tracer */ | |
944 | ret = context_kernel_add(session->kernel_session, ctx, | |
945 | event_name, channel_name); | |
946 | if (ret != LTTCOMM_OK) { | |
947 | goto error; | |
948 | } | |
949 | break; | |
950 | case LTTNG_DOMAIN_UST: | |
951 | { | |
952 | struct ltt_ust_session *usess = session->ust_session; | |
953 | ||
954 | assert(usess); | |
955 | ||
956 | ret = context_ust_add(usess, domain, ctx, event_name, channel_name); | |
957 | if (ret != LTTCOMM_OK) { | |
958 | goto error; | |
959 | } | |
960 | break; | |
961 | } | |
962 | #if 0 | |
963 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
964 | case LTTNG_DOMAIN_UST_PID: | |
965 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
966 | #endif | |
967 | default: | |
968 | ret = LTTCOMM_UND; | |
969 | goto error; | |
970 | } | |
971 | ||
972 | ret = LTTCOMM_OK; | |
973 | ||
974 | error: | |
975 | return ret; | |
976 | } | |
977 | ||
978 | /* | |
979 | * Command LTTNG_SET_FILTER processed by the client thread. | |
980 | */ | |
981 | int cmd_set_filter(struct ltt_session *session, int domain, | |
982 | char *channel_name, char *event_name, | |
983 | struct lttng_filter_bytecode *bytecode) | |
984 | { | |
985 | int ret; | |
986 | ||
987 | switch (domain) { | |
988 | case LTTNG_DOMAIN_KERNEL: | |
989 | ret = LTTCOMM_FATAL; | |
990 | break; | |
991 | case LTTNG_DOMAIN_UST: | |
992 | { | |
993 | struct ltt_ust_session *usess = session->ust_session; | |
994 | ||
995 | ret = filter_ust_set(usess, domain, bytecode, event_name, channel_name); | |
996 | if (ret != LTTCOMM_OK) { | |
997 | goto error; | |
998 | } | |
999 | break; | |
1000 | } | |
1001 | #if 0 | |
1002 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
1003 | case LTTNG_DOMAIN_UST_PID: | |
1004 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
1005 | #endif | |
1006 | default: | |
1007 | ret = LTTCOMM_UND; | |
1008 | goto error; | |
1009 | } | |
1010 | ||
1011 | ret = LTTCOMM_OK; | |
1012 | ||
1013 | error: | |
1014 | return ret; | |
1015 | ||
1016 | } | |
1017 | ||
1018 | ||
1019 | /* | |
1020 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
1021 | */ | |
1022 | int cmd_enable_event(struct ltt_session *session, int domain, | |
1023 | char *channel_name, struct lttng_event *event, int wpipe) | |
1024 | { | |
1025 | int ret; | |
1026 | struct lttng_channel *attr; | |
1027 | ||
1028 | assert(session); | |
1029 | assert(event); | |
1030 | assert(channel_name); | |
1031 | ||
1032 | switch (domain) { | |
1033 | case LTTNG_DOMAIN_KERNEL: | |
1034 | { | |
1035 | struct ltt_kernel_channel *kchan; | |
1036 | ||
1037 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1038 | session->kernel_session); | |
1039 | if (kchan == NULL) { | |
1040 | attr = channel_new_default_attr(domain); | |
1041 | if (attr == NULL) { | |
1042 | ret = LTTCOMM_FATAL; | |
1043 | goto error; | |
1044 | } | |
1045 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1046 | ||
1047 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
1048 | if (ret != LTTCOMM_OK) { | |
1049 | free(attr); | |
1050 | goto error; | |
1051 | } | |
1052 | free(attr); | |
1053 | } | |
1054 | ||
1055 | /* Get the newly created kernel channel pointer */ | |
1056 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1057 | session->kernel_session); | |
1058 | if (kchan == NULL) { | |
1059 | /* This sould not happen... */ | |
1060 | ret = LTTCOMM_FATAL; | |
1061 | goto error; | |
1062 | } | |
1063 | ||
1064 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, | |
1065 | event); | |
1066 | if (ret != LTTCOMM_OK) { | |
1067 | goto error; | |
1068 | } | |
1069 | ||
1070 | kernel_wait_quiescent(kernel_tracer_fd); | |
1071 | break; | |
1072 | } | |
1073 | case LTTNG_DOMAIN_UST: | |
1074 | { | |
1075 | struct ltt_ust_channel *uchan; | |
1076 | struct ltt_ust_session *usess = session->ust_session; | |
1077 | ||
1078 | assert(usess); | |
1079 | ||
1080 | /* Get channel from global UST domain */ | |
1081 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
1082 | channel_name); | |
1083 | if (uchan == NULL) { | |
1084 | /* Create default channel */ | |
1085 | attr = channel_new_default_attr(domain); | |
1086 | if (attr == NULL) { | |
1087 | ret = LTTCOMM_FATAL; | |
1088 | goto error; | |
1089 | } | |
1090 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1091 | ||
1092 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
1093 | if (ret != LTTCOMM_OK) { | |
1094 | free(attr); | |
1095 | goto error; | |
1096 | } | |
1097 | free(attr); | |
1098 | ||
1099 | /* Get the newly created channel reference back */ | |
1100 | uchan = trace_ust_find_channel_by_name( | |
1101 | usess->domain_global.channels, channel_name); | |
1102 | assert(uchan); | |
1103 | } | |
1104 | ||
1105 | /* At this point, the session and channel exist on the tracer */ | |
1106 | ret = event_ust_enable_tracepoint(usess, domain, uchan, event); | |
1107 | if (ret != LTTCOMM_OK) { | |
1108 | goto error; | |
1109 | } | |
1110 | break; | |
1111 | } | |
1112 | #if 0 | |
1113 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
1114 | case LTTNG_DOMAIN_UST_PID: | |
1115 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
1116 | #endif | |
1117 | default: | |
1118 | ret = LTTCOMM_UND; | |
1119 | goto error; | |
1120 | } | |
1121 | ||
1122 | ret = LTTCOMM_OK; | |
1123 | ||
1124 | error: | |
1125 | return ret; | |
1126 | } | |
1127 | ||
1128 | /* | |
1129 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
1130 | */ | |
1131 | int cmd_enable_event_all(struct ltt_session *session, int domain, | |
1132 | char *channel_name, int event_type, int wpipe) | |
1133 | { | |
1134 | int ret; | |
1135 | struct lttng_channel *attr; | |
1136 | ||
1137 | assert(session); | |
1138 | assert(channel_name); | |
1139 | ||
1140 | switch (domain) { | |
1141 | case LTTNG_DOMAIN_KERNEL: | |
1142 | { | |
1143 | struct ltt_kernel_channel *kchan; | |
1144 | ||
1145 | assert(session->kernel_session); | |
1146 | ||
1147 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1148 | session->kernel_session); | |
1149 | if (kchan == NULL) { | |
1150 | /* Create default channel */ | |
1151 | attr = channel_new_default_attr(domain); | |
1152 | if (attr == NULL) { | |
1153 | ret = LTTCOMM_FATAL; | |
1154 | goto error; | |
1155 | } | |
1156 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1157 | ||
1158 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
1159 | if (ret != LTTCOMM_OK) { | |
1160 | free(attr); | |
1161 | goto error; | |
1162 | } | |
1163 | free(attr); | |
1164 | ||
1165 | /* Get the newly created kernel channel pointer */ | |
1166 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1167 | session->kernel_session); | |
1168 | assert(kchan); | |
1169 | } | |
1170 | ||
1171 | switch (event_type) { | |
1172 | case LTTNG_EVENT_SYSCALL: | |
1173 | ret = event_kernel_enable_all_syscalls(session->kernel_session, | |
1174 | kchan, kernel_tracer_fd); | |
1175 | break; | |
1176 | case LTTNG_EVENT_TRACEPOINT: | |
1177 | /* | |
1178 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and | |
1179 | * events already registered to the channel. | |
1180 | */ | |
1181 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, | |
1182 | kchan, kernel_tracer_fd); | |
1183 | break; | |
1184 | case LTTNG_EVENT_ALL: | |
1185 | /* Enable syscalls and tracepoints */ | |
1186 | ret = event_kernel_enable_all(session->kernel_session, | |
1187 | kchan, kernel_tracer_fd); | |
1188 | break; | |
1189 | default: | |
1190 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
1191 | goto error; | |
1192 | } | |
1193 | ||
1194 | /* Manage return value */ | |
1195 | if (ret != LTTCOMM_OK) { | |
1196 | goto error; | |
1197 | } | |
1198 | ||
1199 | kernel_wait_quiescent(kernel_tracer_fd); | |
1200 | break; | |
1201 | } | |
1202 | case LTTNG_DOMAIN_UST: | |
1203 | { | |
1204 | struct ltt_ust_channel *uchan; | |
1205 | struct ltt_ust_session *usess = session->ust_session; | |
1206 | ||
1207 | assert(usess); | |
1208 | ||
1209 | /* Get channel from global UST domain */ | |
1210 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
1211 | channel_name); | |
1212 | if (uchan == NULL) { | |
1213 | /* Create default channel */ | |
1214 | attr = channel_new_default_attr(domain); | |
1215 | if (attr == NULL) { | |
1216 | ret = LTTCOMM_FATAL; | |
1217 | goto error; | |
1218 | } | |
1219 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1220 | ||
1221 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
1222 | if (ret != LTTCOMM_OK) { | |
1223 | free(attr); | |
1224 | goto error; | |
1225 | } | |
1226 | free(attr); | |
1227 | ||
1228 | /* Get the newly created channel reference back */ | |
1229 | uchan = trace_ust_find_channel_by_name( | |
1230 | usess->domain_global.channels, channel_name); | |
1231 | assert(uchan); | |
1232 | } | |
1233 | ||
1234 | /* At this point, the session and channel exist on the tracer */ | |
1235 | ||
1236 | switch (event_type) { | |
1237 | case LTTNG_EVENT_ALL: | |
1238 | case LTTNG_EVENT_TRACEPOINT: | |
1239 | ret = event_ust_enable_all_tracepoints(usess, domain, uchan); | |
1240 | if (ret != LTTCOMM_OK) { | |
1241 | goto error; | |
1242 | } | |
1243 | break; | |
1244 | default: | |
1245 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
1246 | goto error; | |
1247 | } | |
1248 | ||
1249 | /* Manage return value */ | |
1250 | if (ret != LTTCOMM_OK) { | |
1251 | goto error; | |
1252 | } | |
1253 | ||
1254 | break; | |
1255 | } | |
1256 | #if 0 | |
1257 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
1258 | case LTTNG_DOMAIN_UST_PID: | |
1259 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
1260 | #endif | |
1261 | default: | |
1262 | ret = LTTCOMM_UND; | |
1263 | goto error; | |
1264 | } | |
1265 | ||
1266 | ret = LTTCOMM_OK; | |
1267 | ||
1268 | error: | |
1269 | return ret; | |
1270 | } | |
1271 | ||
1272 | ||
1273 | /* | |
1274 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
1275 | */ | |
1276 | ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
1277 | { | |
1278 | int ret; | |
1279 | ssize_t nb_events = 0; | |
1280 | ||
1281 | switch (domain) { | |
1282 | case LTTNG_DOMAIN_KERNEL: | |
1283 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
1284 | if (nb_events < 0) { | |
1285 | ret = LTTCOMM_KERN_LIST_FAIL; | |
1286 | goto error; | |
1287 | } | |
1288 | break; | |
1289 | case LTTNG_DOMAIN_UST: | |
1290 | nb_events = ust_app_list_events(events); | |
1291 | if (nb_events < 0) { | |
1292 | ret = LTTCOMM_UST_LIST_FAIL; | |
1293 | goto error; | |
1294 | } | |
1295 | break; | |
1296 | default: | |
1297 | ret = LTTCOMM_UND; | |
1298 | goto error; | |
1299 | } | |
1300 | ||
1301 | return nb_events; | |
1302 | ||
1303 | error: | |
1304 | /* Return negative value to differentiate return code */ | |
1305 | return -ret; | |
1306 | } | |
1307 | ||
1308 | /* | |
1309 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
1310 | */ | |
1311 | ssize_t cmd_list_tracepoint_fields(int domain, | |
1312 | struct lttng_event_field **fields) | |
1313 | { | |
1314 | int ret; | |
1315 | ssize_t nb_fields = 0; | |
1316 | ||
1317 | switch (domain) { | |
1318 | case LTTNG_DOMAIN_UST: | |
1319 | nb_fields = ust_app_list_event_fields(fields); | |
1320 | if (nb_fields < 0) { | |
1321 | ret = LTTCOMM_UST_LIST_FAIL; | |
1322 | goto error; | |
1323 | } | |
1324 | break; | |
1325 | case LTTNG_DOMAIN_KERNEL: | |
1326 | default: /* fall-through */ | |
1327 | ret = LTTCOMM_UND; | |
1328 | goto error; | |
1329 | } | |
1330 | ||
1331 | return nb_fields; | |
1332 | ||
1333 | error: | |
1334 | /* Return negative value to differentiate return code */ | |
1335 | return -ret; | |
1336 | } | |
1337 | ||
1338 | /* | |
1339 | * Command LTTNG_START_TRACE processed by the client thread. | |
1340 | */ | |
1341 | int cmd_start_trace(struct ltt_session *session) | |
1342 | { | |
1343 | int ret; | |
1344 | struct ltt_kernel_session *ksession; | |
1345 | struct ltt_ust_session *usess; | |
1346 | struct ltt_kernel_channel *kchan; | |
1347 | ||
1348 | assert(session); | |
1349 | ||
1350 | /* Ease our life a bit ;) */ | |
1351 | ksession = session->kernel_session; | |
1352 | usess = session->ust_session; | |
1353 | ||
1354 | if (session->enabled) { | |
1355 | /* Already started. */ | |
1356 | ret = LTTCOMM_TRACE_ALREADY_STARTED; | |
1357 | goto error; | |
1358 | } | |
1359 | ||
1360 | session->enabled = 1; | |
1361 | ||
1362 | ret = setup_relayd(session); | |
1363 | if (ret != LTTCOMM_OK) { | |
1364 | ERR("Error setting up relayd for session %s", session->name); | |
1365 | goto error; | |
1366 | } | |
1367 | ||
1368 | /* Kernel tracing */ | |
1369 | if (ksession != NULL) { | |
1370 | /* Open kernel metadata */ | |
1371 | if (ksession->metadata == NULL) { | |
1372 | ret = kernel_open_metadata(ksession); | |
1373 | if (ret < 0) { | |
1374 | ret = LTTCOMM_KERN_META_FAIL; | |
1375 | goto error; | |
1376 | } | |
1377 | } | |
1378 | ||
1379 | /* Open kernel metadata stream */ | |
1380 | if (ksession->metadata_stream_fd < 0) { | |
1381 | ret = kernel_open_metadata_stream(ksession); | |
1382 | if (ret < 0) { | |
1383 | ERR("Kernel create metadata stream failed"); | |
1384 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
1385 | goto error; | |
1386 | } | |
1387 | } | |
1388 | ||
1389 | /* For each channel */ | |
1390 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
1391 | if (kchan->stream_count == 0) { | |
1392 | ret = kernel_open_channel_stream(kchan); | |
1393 | if (ret < 0) { | |
1394 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
1395 | goto error; | |
1396 | } | |
1397 | /* Update the stream global counter */ | |
1398 | ksession->stream_count_global += ret; | |
1399 | } | |
1400 | } | |
1401 | ||
1402 | /* Setup kernel consumer socket and send fds to it */ | |
1403 | ret = init_kernel_tracing(ksession); | |
1404 | if (ret < 0) { | |
1405 | ret = LTTCOMM_KERN_START_FAIL; | |
1406 | goto error; | |
1407 | } | |
1408 | ||
1409 | /* This start the kernel tracing */ | |
1410 | ret = kernel_start_session(ksession); | |
1411 | if (ret < 0) { | |
1412 | ret = LTTCOMM_KERN_START_FAIL; | |
1413 | goto error; | |
1414 | } | |
1415 | ||
1416 | /* Quiescent wait after starting trace */ | |
1417 | kernel_wait_quiescent(kernel_tracer_fd); | |
1418 | } | |
1419 | ||
1420 | /* Flag session that trace should start automatically */ | |
1421 | if (usess) { | |
1422 | usess->start_trace = 1; | |
1423 | ||
1424 | ret = ust_app_start_trace_all(usess); | |
1425 | if (ret < 0) { | |
1426 | ret = LTTCOMM_UST_START_FAIL; | |
1427 | goto error; | |
1428 | } | |
1429 | } | |
1430 | ||
1431 | ret = LTTCOMM_OK; | |
1432 | ||
1433 | error: | |
1434 | return ret; | |
1435 | } | |
1436 | ||
1437 | /* | |
1438 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
1439 | */ | |
1440 | int cmd_stop_trace(struct ltt_session *session) | |
1441 | { | |
1442 | int ret; | |
1443 | struct ltt_kernel_channel *kchan; | |
1444 | struct ltt_kernel_session *ksession; | |
1445 | struct ltt_ust_session *usess; | |
1446 | ||
1447 | assert(session); | |
1448 | ||
1449 | /* Short cut */ | |
1450 | ksession = session->kernel_session; | |
1451 | usess = session->ust_session; | |
1452 | ||
1453 | if (!session->enabled) { | |
1454 | ret = LTTCOMM_TRACE_ALREADY_STOPPED; | |
1455 | goto error; | |
1456 | } | |
1457 | ||
1458 | session->enabled = 0; | |
1459 | ||
1460 | /* Kernel tracer */ | |
1461 | if (ksession) { | |
1462 | DBG("Stop kernel tracing"); | |
1463 | ||
1464 | /* Flush metadata if exist */ | |
1465 | if (ksession->metadata_stream_fd >= 0) { | |
1466 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
1467 | if (ret < 0) { | |
1468 | ERR("Kernel metadata flush failed"); | |
1469 | } | |
1470 | } | |
1471 | ||
1472 | /* Flush all buffers before stopping */ | |
1473 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
1474 | ret = kernel_flush_buffer(kchan); | |
1475 | if (ret < 0) { | |
1476 | ERR("Kernel flush buffer error"); | |
1477 | } | |
1478 | } | |
1479 | ||
1480 | ret = kernel_stop_session(ksession); | |
1481 | if (ret < 0) { | |
1482 | ret = LTTCOMM_KERN_STOP_FAIL; | |
1483 | goto error; | |
1484 | } | |
1485 | ||
1486 | kernel_wait_quiescent(kernel_tracer_fd); | |
1487 | } | |
1488 | ||
1489 | if (usess) { | |
1490 | usess->start_trace = 0; | |
1491 | ||
1492 | ret = ust_app_stop_trace_all(usess); | |
1493 | if (ret < 0) { | |
1494 | ret = LTTCOMM_UST_STOP_FAIL; | |
1495 | goto error; | |
1496 | } | |
1497 | } | |
1498 | ||
1499 | ret = LTTCOMM_OK; | |
1500 | ||
1501 | error: | |
1502 | return ret; | |
1503 | } | |
1504 | ||
1505 | /* | |
1506 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
1507 | */ | |
1508 | int cmd_set_consumer_uri(int domain, struct ltt_session *session, | |
1509 | size_t nb_uri, struct lttng_uri *uris) | |
1510 | { | |
1511 | int ret, i; | |
1512 | struct ltt_kernel_session *ksess = session->kernel_session; | |
1513 | struct ltt_ust_session *usess = session->ust_session; | |
1514 | struct consumer_output *consumer = NULL; | |
1515 | ||
1516 | assert(session); | |
1517 | assert(uris); | |
1518 | assert(nb_uri > 0); | |
1519 | ||
1520 | /* Can't enable consumer after session started. */ | |
1521 | if (session->enabled) { | |
1522 | ret = LTTCOMM_TRACE_ALREADY_STARTED; | |
1523 | goto error; | |
1524 | } | |
1525 | ||
1526 | if (!session->start_consumer) { | |
1527 | ret = LTTCOMM_NO_CONSUMER; | |
1528 | goto error; | |
1529 | } | |
1530 | ||
1531 | /* | |
1532 | * This case switch makes sure the domain session has a temporary consumer | |
1533 | * so the URL can be set. | |
1534 | */ | |
1535 | switch (domain) { | |
1536 | case 0: | |
1537 | /* Code flow error. A session MUST always have a consumer object */ | |
1538 | assert(session->consumer); | |
1539 | /* | |
1540 | * The URL will be added to the tracing session consumer instead of a | |
1541 | * specific domain consumer. | |
1542 | */ | |
1543 | consumer = session->consumer; | |
1544 | break; | |
1545 | case LTTNG_DOMAIN_KERNEL: | |
1546 | /* Code flow error if we don't have a kernel session here. */ | |
1547 | assert(ksess); | |
1548 | ||
1549 | /* Create consumer output if none exists */ | |
1550 | consumer = ksess->tmp_consumer; | |
1551 | if (consumer == NULL) { | |
1552 | consumer = consumer_copy_output(ksess->consumer); | |
1553 | if (consumer == NULL) { | |
1554 | ret = LTTCOMM_FATAL; | |
1555 | goto error; | |
1556 | } | |
1557 | /* Trash the consumer subdir, we are about to set a new one. */ | |
1558 | memset(consumer->subdir, 0, sizeof(consumer->subdir)); | |
1559 | ksess->tmp_consumer = consumer; | |
1560 | } | |
1561 | ||
1562 | break; | |
1563 | case LTTNG_DOMAIN_UST: | |
1564 | /* Code flow error if we don't have a kernel session here. */ | |
1565 | assert(usess); | |
1566 | ||
1567 | /* Create consumer output if none exists */ | |
1568 | consumer = usess->tmp_consumer; | |
1569 | if (consumer == NULL) { | |
1570 | consumer = consumer_copy_output(usess->consumer); | |
1571 | if (consumer == NULL) { | |
1572 | ret = LTTCOMM_FATAL; | |
1573 | goto error; | |
1574 | } | |
1575 | /* Trash the consumer subdir, we are about to set a new one. */ | |
1576 | memset(consumer->subdir, 0, sizeof(consumer->subdir)); | |
1577 | usess->tmp_consumer = consumer; | |
1578 | } | |
1579 | ||
1580 | break; | |
1581 | } | |
1582 | ||
1583 | for (i = 0; i < nb_uri; i++) { | |
1584 | struct consumer_socket *socket; | |
1585 | struct lttng_ht_iter iter; | |
1586 | ||
1587 | ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name); | |
1588 | if (ret < 0) { | |
1589 | goto error; | |
1590 | } | |
1591 | ||
1592 | /* | |
1593 | * Don't send relayd socket if URI is NOT remote or if the relayd | |
1594 | * sockets for the session are already sent. | |
1595 | */ | |
1596 | if (uris[i].dtype == LTTNG_DST_PATH || | |
1597 | consumer->dst.net.relayd_socks_sent) { | |
1598 | continue; | |
1599 | } | |
1600 | ||
1601 | /* Try to send relayd URI to the consumer if exist. */ | |
1602 | rcu_read_lock(); | |
1603 | cds_lfht_for_each_entry(consumer->socks->ht, &iter.iter, | |
1604 | socket, node.node) { | |
1605 | ||
1606 | /* A socket in the HT should never have a negative fd */ | |
1607 | assert(socket->fd >= 0); | |
1608 | ||
1609 | pthread_mutex_lock(socket->lock); | |
1610 | ret = send_consumer_relayd_socket(domain, session, &uris[i], | |
1611 | consumer, socket->fd); | |
1612 | pthread_mutex_unlock(socket->lock); | |
1613 | if (ret != LTTCOMM_OK) { | |
1614 | rcu_read_unlock(); | |
1615 | goto error; | |
1616 | } | |
1617 | } | |
1618 | rcu_read_unlock(); | |
1619 | } | |
1620 | ||
1621 | /* All good! */ | |
1622 | ret = LTTCOMM_OK; | |
1623 | ||
1624 | error: | |
1625 | return ret; | |
1626 | } | |
1627 | ||
1628 | /* | |
1629 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
1630 | */ | |
1631 | int cmd_create_session_uri(char *name, struct lttng_uri *uris, | |
1632 | size_t nb_uri, lttng_sock_cred *creds) | |
1633 | { | |
1634 | int ret; | |
1635 | char *path = NULL; | |
1636 | struct ltt_session *session; | |
1637 | ||
1638 | assert(name); | |
1639 | ||
1640 | /* | |
1641 | * Verify if the session already exist | |
1642 | * | |
1643 | * XXX: There is no need for the session lock list here since the caller | |
1644 | * (process_client_msg) is holding it. We might want to change that so a | |
1645 | * single command does not lock the entire session list. | |
1646 | */ | |
1647 | session = session_find_by_name(name); | |
1648 | if (session != NULL) { | |
1649 | ret = LTTCOMM_EXIST_SESS; | |
1650 | goto find_error; | |
1651 | } | |
1652 | ||
1653 | /* Create tracing session in the registry */ | |
1654 | ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds), | |
1655 | LTTNG_SOCK_GET_GID_CRED(creds)); | |
1656 | if (ret != LTTCOMM_OK) { | |
1657 | goto session_error; | |
1658 | } | |
1659 | ||
1660 | /* | |
1661 | * Get the newly created session pointer back | |
1662 | * | |
1663 | * XXX: There is no need for the session lock list here since the caller | |
1664 | * (process_client_msg) is holding it. We might want to change that so a | |
1665 | * single command does not lock the entire session list. | |
1666 | */ | |
1667 | session = session_find_by_name(name); | |
1668 | assert(session); | |
1669 | ||
1670 | /* Create default consumer output for the session not yet created. */ | |
1671 | session->consumer = consumer_create_output(CONSUMER_DST_LOCAL); | |
1672 | if (session->consumer == NULL) { | |
1673 | ret = LTTCOMM_FATAL; | |
1674 | goto consumer_error; | |
1675 | } | |
1676 | ||
1677 | /* | |
1678 | * This means that the lttng_create_session call was called with the _path_ | |
1679 | * argument set to NULL. | |
1680 | */ | |
1681 | if (uris == NULL) { | |
1682 | /* | |
1683 | * At this point, we'll skip the consumer URI setup and create a | |
1684 | * session with a NULL path which will flag the session to NOT spawn a | |
1685 | * consumer. | |
1686 | */ | |
1687 | DBG("Create session %s with NO uri, skipping consumer setup", name); | |
1688 | goto end; | |
1689 | } | |
1690 | ||
1691 | session->start_consumer = 1; | |
1692 | ||
1693 | ret = cmd_set_consumer_uri(0, session, nb_uri, uris); | |
1694 | if (ret != LTTCOMM_OK) { | |
1695 | goto consumer_error; | |
1696 | } | |
1697 | ||
1698 | session->consumer->enabled = 1; | |
1699 | ||
1700 | end: | |
1701 | return LTTCOMM_OK; | |
1702 | ||
1703 | consumer_error: | |
1704 | session_destroy(session); | |
1705 | session_error: | |
1706 | find_error: | |
1707 | return ret; | |
1708 | } | |
1709 | ||
1710 | /* | |
1711 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
1712 | */ | |
1713 | int cmd_destroy_session(struct ltt_session *session, int wpipe) | |
1714 | { | |
1715 | int ret; | |
1716 | struct ltt_ust_session *usess; | |
1717 | struct ltt_kernel_session *ksess; | |
1718 | ||
1719 | /* Safety net */ | |
1720 | assert(session); | |
1721 | ||
1722 | usess = session->ust_session; | |
1723 | ksess = session->kernel_session; | |
1724 | ||
1725 | /* Clean kernel session teardown */ | |
1726 | kernel_destroy_session(ksess); | |
1727 | ||
1728 | /* UST session teardown */ | |
1729 | if (usess) { | |
1730 | /* Close any relayd session */ | |
1731 | consumer_output_send_destroy_relayd(usess->consumer); | |
1732 | ||
1733 | /* Destroy every UST application related to this session. */ | |
1734 | ret = ust_app_destroy_trace_all(usess); | |
1735 | if (ret) { | |
1736 | ERR("Error in ust_app_destroy_trace_all"); | |
1737 | } | |
1738 | ||
1739 | /* Clean up the rest. */ | |
1740 | trace_ust_destroy_session(usess); | |
1741 | } | |
1742 | ||
1743 | /* | |
1744 | * Must notify the kernel thread here to update it's poll set in order to | |
1745 | * remove the channel(s)' fd just destroyed. | |
1746 | */ | |
1747 | ret = notify_thread_pipe(wpipe); | |
1748 | if (ret < 0) { | |
1749 | PERROR("write kernel poll pipe"); | |
1750 | } | |
1751 | ||
1752 | ret = session_destroy(session); | |
1753 | ||
1754 | return ret; | |
1755 | } | |
1756 | ||
1757 | /* | |
1758 | * Command LTTNG_CALIBRATE processed by the client thread. | |
1759 | */ | |
1760 | int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
1761 | { | |
1762 | int ret; | |
1763 | ||
1764 | switch (domain) { | |
1765 | case LTTNG_DOMAIN_KERNEL: | |
1766 | { | |
1767 | struct lttng_kernel_calibrate kcalibrate; | |
1768 | ||
1769 | kcalibrate.type = calibrate->type; | |
1770 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
1771 | if (ret < 0) { | |
1772 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
1773 | goto error; | |
1774 | } | |
1775 | break; | |
1776 | } | |
1777 | case LTTNG_DOMAIN_UST: | |
1778 | { | |
1779 | struct lttng_ust_calibrate ucalibrate; | |
1780 | ||
1781 | ucalibrate.type = calibrate->type; | |
1782 | ret = ust_app_calibrate_glb(&ucalibrate); | |
1783 | if (ret < 0) { | |
1784 | ret = LTTCOMM_UST_CALIBRATE_FAIL; | |
1785 | goto error; | |
1786 | } | |
1787 | break; | |
1788 | } | |
1789 | default: | |
1790 | ret = LTTCOMM_UND; | |
1791 | goto error; | |
1792 | } | |
1793 | ||
1794 | ret = LTTCOMM_OK; | |
1795 | ||
1796 | error: | |
1797 | return ret; | |
1798 | } | |
1799 | ||
1800 | /* | |
1801 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
1802 | */ | |
1803 | int cmd_register_consumer(struct ltt_session *session, int domain, | |
1804 | const char *sock_path, struct consumer_data *cdata) | |
1805 | { | |
1806 | int ret, sock; | |
1807 | struct consumer_socket *socket; | |
1808 | ||
1809 | assert(session); | |
1810 | assert(cdata); | |
1811 | assert(sock_path); | |
1812 | ||
1813 | switch (domain) { | |
1814 | case LTTNG_DOMAIN_KERNEL: | |
1815 | { | |
1816 | struct ltt_kernel_session *ksess = session->kernel_session; | |
1817 | ||
1818 | assert(ksess); | |
1819 | ||
1820 | /* Can't register a consumer if there is already one */ | |
1821 | if (ksess->consumer_fds_sent != 0) { | |
1822 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
1823 | goto error; | |
1824 | } | |
1825 | ||
1826 | sock = lttcomm_connect_unix_sock(sock_path); | |
1827 | if (sock < 0) { | |
1828 | ret = LTTCOMM_CONNECT_FAIL; | |
1829 | goto error; | |
1830 | } | |
1831 | ||
1832 | socket = consumer_allocate_socket(sock); | |
1833 | if (socket == NULL) { | |
1834 | ret = LTTCOMM_FATAL; | |
1835 | close(sock); | |
1836 | goto error; | |
1837 | } | |
1838 | ||
1839 | socket->lock = zmalloc(sizeof(pthread_mutex_t)); | |
1840 | if (socket->lock == NULL) { | |
1841 | PERROR("zmalloc pthread mutex"); | |
1842 | ret = LTTCOMM_FATAL; | |
1843 | goto error; | |
1844 | } | |
1845 | pthread_mutex_init(socket->lock, NULL); | |
1846 | socket->registered = 1; | |
1847 | ||
1848 | rcu_read_lock(); | |
1849 | consumer_add_socket(socket, ksess->consumer); | |
1850 | rcu_read_unlock(); | |
1851 | ||
1852 | pthread_mutex_lock(&cdata->pid_mutex); | |
1853 | cdata->pid = -1; | |
1854 | pthread_mutex_unlock(&cdata->pid_mutex); | |
1855 | ||
1856 | break; | |
1857 | } | |
1858 | default: | |
1859 | /* TODO: Userspace tracing */ | |
1860 | ret = LTTCOMM_UND; | |
1861 | goto error; | |
1862 | } | |
1863 | ||
1864 | ret = LTTCOMM_OK; | |
1865 | ||
1866 | error: | |
1867 | return ret; | |
1868 | } | |
1869 | ||
1870 | /* | |
1871 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
1872 | */ | |
1873 | ssize_t cmd_list_domains(struct ltt_session *session, | |
1874 | struct lttng_domain **domains) | |
1875 | { | |
1876 | int ret, index = 0; | |
1877 | ssize_t nb_dom = 0; | |
1878 | ||
1879 | if (session->kernel_session != NULL) { | |
1880 | DBG3("Listing domains found kernel domain"); | |
1881 | nb_dom++; | |
1882 | } | |
1883 | ||
1884 | if (session->ust_session != NULL) { | |
1885 | DBG3("Listing domains found UST global domain"); | |
1886 | nb_dom++; | |
1887 | } | |
1888 | ||
1889 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); | |
1890 | if (*domains == NULL) { | |
1891 | ret = -LTTCOMM_FATAL; | |
1892 | goto error; | |
1893 | } | |
1894 | ||
1895 | if (session->kernel_session != NULL) { | |
1896 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
1897 | index++; | |
1898 | } | |
1899 | ||
1900 | if (session->ust_session != NULL) { | |
1901 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
1902 | index++; | |
1903 | } | |
1904 | ||
1905 | return nb_dom; | |
1906 | ||
1907 | error: | |
1908 | return ret; | |
1909 | } | |
1910 | ||
1911 | ||
1912 | /* | |
1913 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
1914 | */ | |
1915 | ssize_t cmd_list_channels(int domain, struct ltt_session *session, | |
1916 | struct lttng_channel **channels) | |
1917 | { | |
1918 | int ret; | |
1919 | ssize_t nb_chan = 0; | |
1920 | ||
1921 | switch (domain) { | |
1922 | case LTTNG_DOMAIN_KERNEL: | |
1923 | if (session->kernel_session != NULL) { | |
1924 | nb_chan = session->kernel_session->channel_count; | |
1925 | } | |
1926 | DBG3("Number of kernel channels %zd", nb_chan); | |
1927 | break; | |
1928 | case LTTNG_DOMAIN_UST: | |
1929 | if (session->ust_session != NULL) { | |
1930 | nb_chan = lttng_ht_get_count( | |
1931 | session->ust_session->domain_global.channels); | |
1932 | } | |
1933 | DBG3("Number of UST global channels %zd", nb_chan); | |
1934 | break; | |
1935 | default: | |
1936 | *channels = NULL; | |
1937 | ret = -LTTCOMM_UND; | |
1938 | goto error; | |
1939 | } | |
1940 | ||
1941 | if (nb_chan > 0) { | |
1942 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
1943 | if (*channels == NULL) { | |
1944 | ret = -LTTCOMM_FATAL; | |
1945 | goto error; | |
1946 | } | |
1947 | ||
1948 | list_lttng_channels(domain, session, *channels); | |
1949 | } else { | |
1950 | *channels = NULL; | |
1951 | } | |
1952 | ||
1953 | return nb_chan; | |
1954 | ||
1955 | error: | |
1956 | return ret; | |
1957 | } | |
1958 | ||
1959 | /* | |
1960 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
1961 | */ | |
1962 | ssize_t cmd_list_events(int domain, struct ltt_session *session, | |
1963 | char *channel_name, struct lttng_event **events) | |
1964 | { | |
1965 | int ret = 0; | |
1966 | ssize_t nb_event = 0; | |
1967 | ||
1968 | switch (domain) { | |
1969 | case LTTNG_DOMAIN_KERNEL: | |
1970 | if (session->kernel_session != NULL) { | |
1971 | nb_event = list_lttng_kernel_events(channel_name, | |
1972 | session->kernel_session, events); | |
1973 | } | |
1974 | break; | |
1975 | case LTTNG_DOMAIN_UST: | |
1976 | { | |
1977 | if (session->ust_session != NULL) { | |
1978 | nb_event = list_lttng_ust_global_events(channel_name, | |
1979 | &session->ust_session->domain_global, events); | |
1980 | } | |
1981 | break; | |
1982 | } | |
1983 | default: | |
1984 | ret = -LTTCOMM_UND; | |
1985 | goto error; | |
1986 | } | |
1987 | ||
1988 | ret = nb_event; | |
1989 | ||
1990 | error: | |
1991 | return ret; | |
1992 | } | |
1993 | ||
1994 | /* | |
1995 | * Using the session list, filled a lttng_session array to send back to the | |
1996 | * client for session listing. | |
1997 | * | |
1998 | * The session list lock MUST be acquired before calling this function. Use | |
1999 | * session_lock_list() and session_unlock_list(). | |
2000 | */ | |
2001 | void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid, | |
2002 | gid_t gid) | |
2003 | { | |
2004 | int ret; | |
2005 | unsigned int i = 0; | |
2006 | struct ltt_session *session; | |
2007 | struct ltt_session_list *list = session_get_list(); | |
2008 | ||
2009 | DBG("Getting all available session for UID %d GID %d", | |
2010 | uid, gid); | |
2011 | /* | |
2012 | * Iterate over session list and append data after the control struct in | |
2013 | * the buffer. | |
2014 | */ | |
2015 | cds_list_for_each_entry(session, &list->head, list) { | |
2016 | /* | |
2017 | * Only list the sessions the user can control. | |
2018 | */ | |
2019 | if (!session_access_ok(session, uid, gid)) { | |
2020 | continue; | |
2021 | } | |
2022 | ||
2023 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2024 | struct ltt_ust_session *usess = session->ust_session; | |
2025 | ||
2026 | if (session->consumer->type == CONSUMER_DST_NET || | |
2027 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
2028 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
2029 | ret = build_network_session_path(sessions[i].path, | |
2030 | sizeof(session[i].path), session); | |
2031 | } else { | |
2032 | ret = snprintf(sessions[i].path, sizeof(session[i].path), "%s", | |
2033 | session->consumer->dst.trace_path); | |
2034 | } | |
2035 | if (ret < 0) { | |
2036 | PERROR("snprintf session path"); | |
2037 | continue; | |
2038 | } | |
2039 | ||
2040 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
2041 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
2042 | sessions[i].enabled = session->enabled; | |
2043 | i++; | |
2044 | } | |
2045 | } | |
2046 | ||
2047 | /* | |
2048 | * Command LTTNG_DISABLE_CONSUMER processed by the client thread. | |
2049 | */ | |
2050 | int cmd_disable_consumer(int domain, struct ltt_session *session) | |
2051 | { | |
2052 | int ret; | |
2053 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2054 | struct ltt_ust_session *usess = session->ust_session; | |
2055 | struct consumer_output *consumer; | |
2056 | ||
2057 | assert(session); | |
2058 | ||
2059 | if (session->enabled) { | |
2060 | /* Can't disable consumer on an already started session */ | |
2061 | ret = LTTCOMM_TRACE_ALREADY_STARTED; | |
2062 | goto error; | |
2063 | } | |
2064 | ||
2065 | if (!session->start_consumer) { | |
2066 | ret = LTTCOMM_NO_CONSUMER; | |
2067 | goto error; | |
2068 | } | |
2069 | ||
2070 | switch (domain) { | |
2071 | case 0: | |
2072 | DBG("Disable tracing session %s consumer", session->name); | |
2073 | consumer = session->consumer; | |
2074 | break; | |
2075 | case LTTNG_DOMAIN_KERNEL: | |
2076 | /* Code flow error if we don't have a kernel session here. */ | |
2077 | assert(ksess); | |
2078 | ||
2079 | DBG("Disabling kernel consumer"); | |
2080 | consumer = ksess->consumer; | |
2081 | ||
2082 | break; | |
2083 | case LTTNG_DOMAIN_UST: | |
2084 | /* Code flow error if we don't have a UST session here. */ | |
2085 | assert(usess); | |
2086 | ||
2087 | DBG("Disabling UST consumer"); | |
2088 | consumer = usess->consumer; | |
2089 | ||
2090 | break; | |
2091 | default: | |
2092 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2093 | goto error; | |
2094 | } | |
2095 | ||
2096 | if (consumer) { | |
2097 | consumer->enabled = 0; | |
2098 | /* Success at this point */ | |
2099 | ret = LTTCOMM_OK; | |
2100 | } else { | |
2101 | ret = LTTCOMM_NO_CONSUMER; | |
2102 | } | |
2103 | ||
2104 | error: | |
2105 | return ret; | |
2106 | } | |
2107 | ||
2108 | /* | |
2109 | * Command LTTNG_ENABLE_CONSUMER processed by the client thread. | |
2110 | */ | |
2111 | int cmd_enable_consumer(int domain, struct ltt_session *session) | |
2112 | { | |
2113 | int ret; | |
2114 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2115 | struct ltt_ust_session *usess = session->ust_session; | |
2116 | struct consumer_output *consumer = NULL; | |
2117 | ||
2118 | assert(session); | |
2119 | ||
2120 | /* Can't enable consumer after session started. */ | |
2121 | if (session->enabled) { | |
2122 | ret = LTTCOMM_TRACE_ALREADY_STARTED; | |
2123 | goto error; | |
2124 | } | |
2125 | ||
2126 | if (!session->start_consumer) { | |
2127 | ret = LTTCOMM_NO_CONSUMER; | |
2128 | goto error; | |
2129 | } | |
2130 | ||
2131 | switch (domain) { | |
2132 | case 0: | |
2133 | assert(session->consumer); | |
2134 | consumer = session->consumer; | |
2135 | break; | |
2136 | case LTTNG_DOMAIN_KERNEL: | |
2137 | /* Code flow error if we don't have a kernel session here. */ | |
2138 | assert(ksess); | |
2139 | ||
2140 | /* | |
2141 | * Check if we have already sent fds to the consumer. In that case, | |
2142 | * the enable-consumer command can't be used because a start trace | |
2143 | * had previously occured. | |
2144 | */ | |
2145 | if (ksess->consumer_fds_sent) { | |
2146 | ret = LTTCOMM_ENABLE_CONSUMER_FAIL; | |
2147 | goto error; | |
2148 | } | |
2149 | ||
2150 | consumer = ksess->tmp_consumer; | |
2151 | if (consumer == NULL) { | |
2152 | ret = LTTCOMM_OK; | |
2153 | /* No temp. consumer output exists. Using the current one. */ | |
2154 | DBG3("No temporary consumer. Using default"); | |
2155 | consumer = ksess->consumer; | |
2156 | goto error; | |
2157 | } | |
2158 | ||
2159 | switch (consumer->type) { | |
2160 | case CONSUMER_DST_LOCAL: | |
2161 | DBG2("Consumer output is local. Creating directory(ies)"); | |
2162 | ||
2163 | /* Create directory(ies) */ | |
2164 | ret = run_as_mkdir_recursive(consumer->dst.trace_path, | |
2165 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
2166 | if (ret < 0) { | |
2167 | if (ret != -EEXIST) { | |
2168 | ERR("Trace directory creation error"); | |
2169 | ret = LTTCOMM_FATAL; | |
2170 | goto error; | |
2171 | } | |
2172 | } | |
2173 | break; | |
2174 | case CONSUMER_DST_NET: | |
2175 | DBG2("Consumer output is network. Validating URIs"); | |
2176 | /* Validate if we have both control and data path set. */ | |
2177 | if (!consumer->dst.net.control_isset) { | |
2178 | ret = LTTCOMM_URL_CTRL_MISS; | |
2179 | goto error; | |
2180 | } | |
2181 | ||
2182 | if (!consumer->dst.net.data_isset) { | |
2183 | ret = LTTCOMM_URL_DATA_MISS; | |
2184 | goto error; | |
2185 | } | |
2186 | ||
2187 | /* Check established network session state */ | |
2188 | if (session->net_handle == 0) { | |
2189 | ret = LTTCOMM_ENABLE_CONSUMER_FAIL; | |
2190 | ERR("Session network handle is not set on enable-consumer"); | |
2191 | goto error; | |
2192 | } | |
2193 | ||
2194 | break; | |
2195 | } | |
2196 | ||
2197 | /* Append default kernel trace dir to subdir */ | |
2198 | strncat(ksess->consumer->subdir, DEFAULT_KERNEL_TRACE_DIR, | |
2199 | sizeof(ksess->consumer->subdir)); | |
2200 | ||
2201 | /* | |
2202 | * @session-lock | |
2203 | * This is race free for now since the session lock is acquired before | |
2204 | * ending up in this function. No other threads can access this kernel | |
2205 | * session without this lock hence freeing the consumer output object | |
2206 | * is valid. | |
2207 | */ | |
2208 | rcu_read_lock(); | |
2209 | consumer_destroy_output(ksess->consumer); | |
2210 | rcu_read_unlock(); | |
2211 | ksess->consumer = consumer; | |
2212 | ksess->tmp_consumer = NULL; | |
2213 | ||
2214 | break; | |
2215 | case LTTNG_DOMAIN_UST: | |
2216 | /* Code flow error if we don't have a UST session here. */ | |
2217 | assert(usess); | |
2218 | ||
2219 | /* | |
2220 | * Check if we have already sent fds to the consumer. In that case, | |
2221 | * the enable-consumer command can't be used because a start trace | |
2222 | * had previously occured. | |
2223 | */ | |
2224 | if (usess->start_trace) { | |
2225 | ret = LTTCOMM_ENABLE_CONSUMER_FAIL; | |
2226 | goto error; | |
2227 | } | |
2228 | ||
2229 | consumer = usess->tmp_consumer; | |
2230 | if (consumer == NULL) { | |
2231 | ret = LTTCOMM_OK; | |
2232 | /* No temp. consumer output exists. Using the current one. */ | |
2233 | DBG3("No temporary consumer. Using default"); | |
2234 | consumer = usess->consumer; | |
2235 | goto error; | |
2236 | } | |
2237 | ||
2238 | switch (consumer->type) { | |
2239 | case CONSUMER_DST_LOCAL: | |
2240 | DBG2("Consumer output is local. Creating directory(ies)"); | |
2241 | ||
2242 | /* Create directory(ies) */ | |
2243 | ret = run_as_mkdir_recursive(consumer->dst.trace_path, | |
2244 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
2245 | if (ret < 0) { | |
2246 | if (ret != -EEXIST) { | |
2247 | ERR("Trace directory creation error"); | |
2248 | ret = LTTCOMM_FATAL; | |
2249 | goto error; | |
2250 | } | |
2251 | } | |
2252 | break; | |
2253 | case CONSUMER_DST_NET: | |
2254 | DBG2("Consumer output is network. Validating URIs"); | |
2255 | /* Validate if we have both control and data path set. */ | |
2256 | if (!consumer->dst.net.control_isset) { | |
2257 | ret = LTTCOMM_URL_CTRL_MISS; | |
2258 | goto error; | |
2259 | } | |
2260 | ||
2261 | if (!consumer->dst.net.data_isset) { | |
2262 | ret = LTTCOMM_URL_DATA_MISS; | |
2263 | goto error; | |
2264 | } | |
2265 | ||
2266 | /* Check established network session state */ | |
2267 | if (session->net_handle == 0) { | |
2268 | ret = LTTCOMM_ENABLE_CONSUMER_FAIL; | |
2269 | DBG2("Session network handle is not set on enable-consumer"); | |
2270 | goto error; | |
2271 | } | |
2272 | ||
2273 | if (consumer->net_seq_index == -1) { | |
2274 | ret = LTTCOMM_ENABLE_CONSUMER_FAIL; | |
2275 | DBG2("Network index is not set on the consumer"); | |
2276 | goto error; | |
2277 | } | |
2278 | ||
2279 | break; | |
2280 | } | |
2281 | ||
2282 | /* Append default kernel trace dir to subdir */ | |
2283 | strncat(usess->consumer->subdir, DEFAULT_UST_TRACE_DIR, | |
2284 | sizeof(usess->consumer->subdir)); | |
2285 | ||
2286 | /* | |
2287 | * @session-lock | |
2288 | * This is race free for now since the session lock is acquired before | |
2289 | * ending up in this function. No other threads can access this kernel | |
2290 | * session without this lock hence freeing the consumer output object | |
2291 | * is valid. | |
2292 | */ | |
2293 | rcu_read_lock(); | |
2294 | consumer_destroy_output(usess->consumer); | |
2295 | rcu_read_unlock(); | |
2296 | usess->consumer = consumer; | |
2297 | usess->tmp_consumer = NULL; | |
2298 | ||
2299 | break; | |
2300 | } | |
2301 | ||
2302 | /* Enable it */ | |
2303 | if (consumer) { | |
2304 | consumer->enabled = 1; | |
2305 | /* Success at this point */ | |
2306 | ret = LTTCOMM_OK; | |
2307 | } else { | |
2308 | /* Should not really happend... */ | |
2309 | ret = LTTCOMM_NO_CONSUMER; | |
2310 | } | |
2311 | ||
2312 | error: | |
2313 | return ret; | |
2314 | } | |
2315 | ||
2316 | /* | |
2317 | * Init command subsystem. | |
2318 | */ | |
2319 | void cmd_init(void) | |
2320 | { | |
2321 | /* | |
2322 | * Set network sequence index to 1 for streams to match a relayd socket on | |
2323 | * the consumer side. | |
2324 | */ | |
2325 | uatomic_set(&relayd_net_seq_idx, 1); | |
2326 | ||
2327 | DBG("Command subsystem initialized"); | |
2328 | } |