Commit | Line | Data |
---|---|---|
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) { | |
f73fabfd | 191 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
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) { | |
f73fabfd | 208 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
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) { | |
f73fabfd | 268 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
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) { | |
f73fabfd | 277 | goto end; |
2f77fc4b DG |
278 | } |
279 | ||
280 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
281 | if (*events == NULL) { | |
f73fabfd | 282 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
283 | goto error; |
284 | } | |
285 | ||
286 | /* Kernel channels */ | |
287 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
288 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
289 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
290 | (*events)[i].enabled = event->enabled; | |
291 | ||
292 | switch (event->event->instrumentation) { | |
293 | case LTTNG_KERNEL_TRACEPOINT: | |
294 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; | |
295 | break; | |
296 | case LTTNG_KERNEL_KPROBE: | |
297 | case LTTNG_KERNEL_KRETPROBE: | |
298 | (*events)[i].type = LTTNG_EVENT_PROBE; | |
299 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
300 | sizeof(struct lttng_kernel_kprobe)); | |
301 | break; | |
302 | case LTTNG_KERNEL_FUNCTION: | |
303 | (*events)[i].type = LTTNG_EVENT_FUNCTION; | |
304 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
305 | sizeof(struct lttng_kernel_function)); | |
306 | break; | |
307 | case LTTNG_KERNEL_NOOP: | |
308 | (*events)[i].type = LTTNG_EVENT_NOOP; | |
309 | break; | |
310 | case LTTNG_KERNEL_SYSCALL: | |
311 | (*events)[i].type = LTTNG_EVENT_SYSCALL; | |
312 | break; | |
313 | case LTTNG_KERNEL_ALL: | |
314 | assert(0); | |
315 | break; | |
316 | } | |
317 | i++; | |
318 | } | |
319 | ||
f73fabfd | 320 | end: |
2f77fc4b DG |
321 | return nb_event; |
322 | ||
323 | error: | |
f73fabfd DG |
324 | /* Negate the error code to differentiate the size from an error */ |
325 | return -ret; | |
2f77fc4b DG |
326 | } |
327 | ||
328 | /* | |
329 | * Add URI so the consumer output object. Set the correct path depending on the | |
330 | * domain adding the default trace directory. | |
331 | */ | |
332 | static int add_uri_to_consumer(struct consumer_output *consumer, | |
333 | struct lttng_uri *uri, int domain, const char *session_name) | |
334 | { | |
f73fabfd | 335 | int ret = LTTNG_OK; |
2f77fc4b DG |
336 | const char *default_trace_dir; |
337 | ||
338 | assert(uri); | |
339 | ||
340 | if (consumer == NULL) { | |
341 | DBG("No consumer detected. Don't add URI. Stopping."); | |
f73fabfd | 342 | ret = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
343 | goto error; |
344 | } | |
345 | ||
346 | switch (domain) { | |
347 | case LTTNG_DOMAIN_KERNEL: | |
348 | default_trace_dir = DEFAULT_KERNEL_TRACE_DIR; | |
349 | break; | |
350 | case LTTNG_DOMAIN_UST: | |
351 | default_trace_dir = DEFAULT_UST_TRACE_DIR; | |
352 | break; | |
353 | default: | |
354 | /* | |
355 | * This case is possible is we try to add the URI to the global tracing | |
356 | * session consumer object which in this case there is no subdir. | |
357 | */ | |
358 | default_trace_dir = ""; | |
359 | } | |
360 | ||
361 | switch (uri->dtype) { | |
362 | case LTTNG_DST_IPV4: | |
363 | case LTTNG_DST_IPV6: | |
364 | DBG2("Setting network URI to consumer"); | |
365 | ||
366 | /* Set URI into consumer output object */ | |
367 | ret = consumer_set_network_uri(consumer, uri); | |
368 | if (ret < 0) { | |
f73fabfd | 369 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
370 | goto error; |
371 | } else if (ret == 1) { | |
372 | /* | |
373 | * URI was the same in the consumer so we do not append the subdir | |
374 | * again so to not duplicate output dir. | |
375 | */ | |
376 | goto error; | |
377 | } | |
378 | ||
379 | if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) { | |
380 | ret = consumer_set_subdir(consumer, session_name); | |
381 | if (ret < 0) { | |
f73fabfd | 382 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
383 | goto error; |
384 | } | |
385 | } | |
386 | ||
387 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
388 | /* On a new subdir, reappend the default trace dir. */ | |
c30ce0b3 CB |
389 | strncat(consumer->subdir, default_trace_dir, |
390 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
391 | DBG3("Append domain trace name to subdir %s", consumer->subdir); |
392 | } | |
393 | ||
394 | break; | |
395 | case LTTNG_DST_PATH: | |
396 | DBG2("Setting trace directory path from URI to %s", uri->dst.path); | |
397 | memset(consumer->dst.trace_path, 0, | |
398 | sizeof(consumer->dst.trace_path)); | |
399 | strncpy(consumer->dst.trace_path, uri->dst.path, | |
400 | sizeof(consumer->dst.trace_path)); | |
401 | /* Append default trace dir */ | |
402 | strncat(consumer->dst.trace_path, default_trace_dir, | |
c30ce0b3 CB |
403 | sizeof(consumer->dst.trace_path) - |
404 | strlen(consumer->dst.trace_path) - 1); | |
2f77fc4b DG |
405 | /* Flag consumer as local. */ |
406 | consumer->type = CONSUMER_DST_LOCAL; | |
407 | break; | |
408 | } | |
409 | ||
410 | error: | |
411 | return ret; | |
412 | } | |
413 | ||
414 | /* | |
415 | * Init tracing by creating trace directory and sending fds kernel consumer. | |
416 | */ | |
417 | static int init_kernel_tracing(struct ltt_kernel_session *session) | |
418 | { | |
419 | int ret = 0; | |
420 | struct lttng_ht_iter iter; | |
421 | struct consumer_socket *socket; | |
422 | ||
423 | assert(session); | |
424 | ||
425 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { | |
426 | cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter, | |
427 | socket, node.node) { | |
428 | /* Code flow error */ | |
429 | assert(socket->fd >= 0); | |
430 | ||
431 | pthread_mutex_lock(socket->lock); | |
432 | ret = kernel_consumer_send_session(socket->fd, session); | |
433 | pthread_mutex_unlock(socket->lock); | |
434 | if (ret < 0) { | |
f73fabfd | 435 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
436 | goto error; |
437 | } | |
438 | } | |
439 | } | |
440 | ||
441 | error: | |
442 | return ret; | |
443 | } | |
444 | ||
445 | /* | |
446 | * Create a socket to the relayd using the URI. | |
447 | * | |
448 | * On success, the relayd_sock pointer is set to the created socket. | |
449 | * Else, it's stays untouched and a lttcomm error code is returned. | |
450 | */ | |
451 | static int create_connect_relayd(struct consumer_output *output, | |
452 | const char *session_name, struct lttng_uri *uri, | |
453 | struct lttcomm_sock **relayd_sock) | |
454 | { | |
455 | int ret; | |
456 | struct lttcomm_sock *sock; | |
457 | ||
458 | /* Create socket object from URI */ | |
459 | sock = lttcomm_alloc_sock_from_uri(uri); | |
460 | if (sock == NULL) { | |
f73fabfd | 461 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
462 | goto error; |
463 | } | |
464 | ||
465 | ret = lttcomm_create_sock(sock); | |
466 | if (ret < 0) { | |
f73fabfd | 467 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
468 | goto error; |
469 | } | |
470 | ||
471 | /* Connect to relayd so we can proceed with a session creation. */ | |
472 | ret = relayd_connect(sock); | |
473 | if (ret < 0) { | |
474 | ERR("Unable to reach lttng-relayd"); | |
f73fabfd | 475 | ret = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
476 | goto free_sock; |
477 | } | |
478 | ||
479 | /* Create socket for control stream. */ | |
480 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
481 | DBG3("Creating relayd stream socket from URI"); | |
482 | ||
483 | /* Check relayd version */ | |
484 | ret = relayd_version_check(sock, RELAYD_VERSION_COMM_MAJOR, | |
485 | RELAYD_VERSION_COMM_MINOR); | |
486 | if (ret < 0) { | |
f73fabfd | 487 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; |
2f77fc4b DG |
488 | goto close_sock; |
489 | } | |
490 | } else if (uri->stype == LTTNG_STREAM_DATA) { | |
491 | DBG3("Creating relayd data socket from URI"); | |
492 | } else { | |
493 | /* Command is not valid */ | |
494 | ERR("Relayd invalid stream type: %d", uri->stype); | |
f73fabfd | 495 | ret = LTTNG_ERR_INVALID; |
2f77fc4b DG |
496 | goto close_sock; |
497 | } | |
498 | ||
499 | *relayd_sock = sock; | |
500 | ||
f73fabfd | 501 | return LTTNG_OK; |
2f77fc4b DG |
502 | |
503 | close_sock: | |
504 | if (sock) { | |
505 | (void) relayd_close(sock); | |
506 | } | |
507 | free_sock: | |
508 | if (sock) { | |
509 | lttcomm_destroy_sock(sock); | |
510 | } | |
511 | error: | |
512 | return ret; | |
513 | } | |
514 | ||
515 | /* | |
516 | * Connect to the relayd using URI and send the socket to the right consumer. | |
517 | */ | |
518 | static int send_consumer_relayd_socket(int domain, struct ltt_session *session, | |
519 | struct lttng_uri *relayd_uri, struct consumer_output *consumer, | |
520 | int consumer_fd) | |
521 | { | |
522 | int ret; | |
523 | struct lttcomm_sock *sock = NULL; | |
524 | ||
525 | /* Set the network sequence index if not set. */ | |
526 | if (consumer->net_seq_index == -1) { | |
527 | /* | |
528 | * Increment net_seq_idx because we are about to transfer the | |
529 | * new relayd socket to the consumer. | |
530 | */ | |
531 | uatomic_inc(&relayd_net_seq_idx); | |
532 | /* Assign unique key so the consumer can match streams */ | |
533 | uatomic_set(&consumer->net_seq_index, | |
534 | uatomic_read(&relayd_net_seq_idx)); | |
535 | } | |
536 | ||
537 | /* Connect to relayd and make version check if uri is the control. */ | |
538 | ret = create_connect_relayd(consumer, session->name, relayd_uri, &sock); | |
f73fabfd | 539 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
540 | goto close_sock; |
541 | } | |
542 | ||
543 | /* If the control socket is connected, network session is ready */ | |
544 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
545 | session->net_handle = 1; | |
546 | } | |
547 | ||
548 | /* Send relayd socket to consumer. */ | |
549 | ret = consumer_send_relayd_socket(consumer_fd, sock, | |
550 | consumer, relayd_uri->stype); | |
551 | if (ret < 0) { | |
f73fabfd | 552 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
553 | goto close_sock; |
554 | } | |
555 | ||
c890b720 DG |
556 | /* Flag that the corresponding socket was sent. */ |
557 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
558 | consumer->dst.net.control_sock_sent = 1; | |
559 | } else if (relayd_uri->stype == LTTNG_STREAM_DATA) { | |
560 | consumer->dst.net.data_sock_sent = 1; | |
561 | } | |
562 | ||
f73fabfd | 563 | ret = LTTNG_OK; |
2f77fc4b DG |
564 | |
565 | /* | |
566 | * Close socket which was dup on the consumer side. The session daemon does | |
567 | * NOT keep track of the relayd socket(s) once transfer to the consumer. | |
568 | */ | |
569 | ||
570 | close_sock: | |
571 | if (sock) { | |
572 | (void) relayd_close(sock); | |
573 | lttcomm_destroy_sock(sock); | |
574 | } | |
575 | ||
576 | return ret; | |
577 | } | |
578 | ||
579 | /* | |
580 | * Send both relayd sockets to a specific consumer and domain. This is a | |
581 | * helper function to facilitate sending the information to the consumer for a | |
582 | * session. | |
583 | */ | |
584 | static int send_consumer_relayd_sockets(int domain, | |
585 | struct ltt_session *session, struct consumer_output *consumer, int fd) | |
586 | { | |
dda67f6c | 587 | int ret = LTTNG_OK; |
2f77fc4b DG |
588 | |
589 | assert(session); | |
590 | assert(consumer); | |
591 | ||
2f77fc4b | 592 | /* Sending control relayd socket. */ |
c890b720 DG |
593 | if (!consumer->dst.net.control_sock_sent) { |
594 | ret = send_consumer_relayd_socket(domain, session, | |
595 | &consumer->dst.net.control, consumer, fd); | |
596 | if (ret != LTTNG_OK) { | |
597 | goto error; | |
598 | } | |
2f77fc4b DG |
599 | } |
600 | ||
601 | /* Sending data relayd socket. */ | |
c890b720 DG |
602 | if (!consumer->dst.net.data_sock_sent) { |
603 | ret = send_consumer_relayd_socket(domain, session, | |
604 | &consumer->dst.net.data, consumer, fd); | |
605 | if (ret != LTTNG_OK) { | |
606 | goto error; | |
607 | } | |
2f77fc4b DG |
608 | } |
609 | ||
2f77fc4b DG |
610 | error: |
611 | return ret; | |
612 | } | |
613 | ||
614 | /* | |
615 | * Setup relayd connections for a tracing session. First creates the socket to | |
616 | * the relayd and send them to the right domain consumer. Consumer type MUST be | |
617 | * network. | |
618 | */ | |
619 | static int setup_relayd(struct ltt_session *session) | |
620 | { | |
f73fabfd | 621 | int ret = LTTNG_OK; |
2f77fc4b DG |
622 | struct ltt_ust_session *usess; |
623 | struct ltt_kernel_session *ksess; | |
624 | struct consumer_socket *socket; | |
625 | struct lttng_ht_iter iter; | |
626 | ||
627 | assert(session); | |
628 | ||
629 | usess = session->ust_session; | |
630 | ksess = session->kernel_session; | |
631 | ||
632 | DBG2("Setting relayd for session %s", session->name); | |
633 | ||
634 | if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET | |
635 | && usess->consumer->enabled) { | |
636 | /* For each consumer socket, send relayd sockets */ | |
637 | cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, | |
638 | socket, node.node) { | |
639 | /* Code flow error */ | |
640 | assert(socket->fd >= 0); | |
641 | ||
642 | pthread_mutex_lock(socket->lock); | |
dda67f6c | 643 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session, |
2f77fc4b DG |
644 | usess->consumer, socket->fd); |
645 | pthread_mutex_unlock(socket->lock); | |
f73fabfd | 646 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
647 | goto error; |
648 | } | |
649 | } | |
650 | } | |
651 | ||
652 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET | |
653 | && ksess->consumer->enabled) { | |
654 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
655 | socket, node.node) { | |
656 | /* Code flow error */ | |
657 | assert(socket->fd >= 0); | |
658 | ||
659 | pthread_mutex_lock(socket->lock); | |
dda67f6c | 660 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session, |
2f77fc4b DG |
661 | ksess->consumer, socket->fd); |
662 | pthread_mutex_unlock(socket->lock); | |
f73fabfd | 663 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
664 | goto error; |
665 | } | |
666 | } | |
667 | } | |
668 | ||
669 | error: | |
670 | return ret; | |
671 | } | |
672 | ||
673 | /* | |
674 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. | |
675 | */ | |
676 | int cmd_disable_channel(struct ltt_session *session, int domain, | |
677 | char *channel_name) | |
678 | { | |
679 | int ret; | |
680 | struct ltt_ust_session *usess; | |
681 | ||
682 | usess = session->ust_session; | |
683 | ||
684 | switch (domain) { | |
685 | case LTTNG_DOMAIN_KERNEL: | |
686 | { | |
687 | ret = channel_kernel_disable(session->kernel_session, | |
688 | channel_name); | |
f73fabfd | 689 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
690 | goto error; |
691 | } | |
692 | ||
693 | kernel_wait_quiescent(kernel_tracer_fd); | |
694 | break; | |
695 | } | |
696 | case LTTNG_DOMAIN_UST: | |
697 | { | |
698 | struct ltt_ust_channel *uchan; | |
699 | struct lttng_ht *chan_ht; | |
700 | ||
701 | chan_ht = usess->domain_global.channels; | |
702 | ||
703 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
704 | if (uchan == NULL) { | |
f73fabfd | 705 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
706 | goto error; |
707 | } | |
708 | ||
709 | ret = channel_ust_disable(usess, domain, uchan); | |
f73fabfd | 710 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
711 | goto error; |
712 | } | |
713 | break; | |
714 | } | |
715 | #if 0 | |
716 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
717 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
718 | case LTTNG_DOMAIN_UST_PID: | |
719 | #endif | |
720 | default: | |
f73fabfd | 721 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
722 | goto error; |
723 | } | |
724 | ||
f73fabfd | 725 | ret = LTTNG_OK; |
2f77fc4b DG |
726 | |
727 | error: | |
728 | return ret; | |
729 | } | |
730 | ||
731 | /* | |
732 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
733 | * | |
734 | * The wpipe arguments is used as a notifier for the kernel thread. | |
735 | */ | |
736 | int cmd_enable_channel(struct ltt_session *session, | |
737 | int domain, struct lttng_channel *attr, int wpipe) | |
738 | { | |
739 | int ret; | |
740 | struct ltt_ust_session *usess = session->ust_session; | |
741 | struct lttng_ht *chan_ht; | |
742 | ||
743 | assert(session); | |
744 | assert(attr); | |
745 | ||
746 | DBG("Enabling channel %s for session %s", attr->name, session->name); | |
747 | ||
748 | switch (domain) { | |
749 | case LTTNG_DOMAIN_KERNEL: | |
750 | { | |
751 | struct ltt_kernel_channel *kchan; | |
752 | ||
753 | /* Mandatory for a kernel channel. */ | |
754 | assert(wpipe > 0); | |
755 | ||
756 | kchan = trace_kernel_get_channel_by_name(attr->name, | |
757 | session->kernel_session); | |
758 | if (kchan == NULL) { | |
759 | ret = channel_kernel_create(session->kernel_session, attr, wpipe); | |
760 | } else { | |
761 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
762 | } | |
763 | ||
f73fabfd | 764 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
765 | goto error; |
766 | } | |
767 | ||
768 | kernel_wait_quiescent(kernel_tracer_fd); | |
769 | break; | |
770 | } | |
771 | case LTTNG_DOMAIN_UST: | |
772 | { | |
773 | struct ltt_ust_channel *uchan; | |
774 | ||
775 | chan_ht = usess->domain_global.channels; | |
776 | ||
777 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); | |
778 | if (uchan == NULL) { | |
779 | ret = channel_ust_create(usess, domain, attr); | |
780 | } else { | |
781 | ret = channel_ust_enable(usess, domain, uchan); | |
782 | } | |
783 | break; | |
784 | } | |
785 | #if 0 | |
786 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
787 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
788 | case LTTNG_DOMAIN_UST_PID: | |
789 | #endif | |
790 | default: | |
f73fabfd | 791 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
792 | goto error; |
793 | } | |
794 | ||
795 | error: | |
796 | return ret; | |
797 | } | |
798 | ||
799 | ||
800 | /* | |
801 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
802 | */ | |
803 | int cmd_disable_event(struct ltt_session *session, int domain, | |
804 | char *channel_name, char *event_name) | |
805 | { | |
806 | int ret; | |
807 | ||
808 | switch (domain) { | |
809 | case LTTNG_DOMAIN_KERNEL: | |
810 | { | |
811 | struct ltt_kernel_channel *kchan; | |
812 | struct ltt_kernel_session *ksess; | |
813 | ||
814 | ksess = session->kernel_session; | |
815 | ||
816 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
817 | if (kchan == NULL) { | |
f73fabfd | 818 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
819 | goto error; |
820 | } | |
821 | ||
822 | ret = event_kernel_disable_tracepoint(ksess, kchan, event_name); | |
f73fabfd | 823 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
824 | goto error; |
825 | } | |
826 | ||
827 | kernel_wait_quiescent(kernel_tracer_fd); | |
828 | break; | |
829 | } | |
830 | case LTTNG_DOMAIN_UST: | |
831 | { | |
832 | struct ltt_ust_channel *uchan; | |
833 | struct ltt_ust_session *usess; | |
834 | ||
835 | usess = session->ust_session; | |
836 | ||
837 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
838 | channel_name); | |
839 | if (uchan == NULL) { | |
f73fabfd | 840 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
841 | goto error; |
842 | } | |
843 | ||
844 | ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name); | |
f73fabfd | 845 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
846 | goto error; |
847 | } | |
848 | ||
849 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
850 | channel_name); | |
851 | break; | |
852 | } | |
853 | #if 0 | |
854 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
855 | case LTTNG_DOMAIN_UST_PID: | |
856 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
857 | #endif | |
858 | default: | |
f73fabfd | 859 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
860 | goto error; |
861 | } | |
862 | ||
f73fabfd | 863 | ret = LTTNG_OK; |
2f77fc4b DG |
864 | |
865 | error: | |
866 | return ret; | |
867 | } | |
868 | ||
869 | /* | |
870 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
871 | */ | |
872 | int cmd_disable_event_all(struct ltt_session *session, int domain, | |
873 | char *channel_name) | |
874 | { | |
875 | int ret; | |
876 | ||
877 | switch (domain) { | |
878 | case LTTNG_DOMAIN_KERNEL: | |
879 | { | |
880 | struct ltt_kernel_session *ksess; | |
881 | struct ltt_kernel_channel *kchan; | |
882 | ||
883 | ksess = session->kernel_session; | |
884 | ||
885 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
886 | if (kchan == NULL) { | |
f73fabfd | 887 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
888 | goto error; |
889 | } | |
890 | ||
891 | ret = event_kernel_disable_all(ksess, kchan); | |
f73fabfd | 892 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
893 | goto error; |
894 | } | |
895 | ||
896 | kernel_wait_quiescent(kernel_tracer_fd); | |
897 | break; | |
898 | } | |
899 | case LTTNG_DOMAIN_UST: | |
900 | { | |
901 | struct ltt_ust_session *usess; | |
902 | struct ltt_ust_channel *uchan; | |
903 | ||
904 | usess = session->ust_session; | |
905 | ||
906 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
907 | channel_name); | |
908 | if (uchan == NULL) { | |
f73fabfd | 909 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
910 | goto error; |
911 | } | |
912 | ||
913 | ret = event_ust_disable_all_tracepoints(usess, domain, uchan); | |
914 | if (ret != 0) { | |
915 | goto error; | |
916 | } | |
917 | ||
918 | DBG3("Disable all UST events in channel %s completed", channel_name); | |
919 | ||
920 | break; | |
921 | } | |
922 | #if 0 | |
923 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
924 | case LTTNG_DOMAIN_UST_PID: | |
925 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
926 | #endif | |
927 | default: | |
f73fabfd | 928 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
929 | goto error; |
930 | } | |
931 | ||
f73fabfd | 932 | ret = LTTNG_OK; |
2f77fc4b DG |
933 | |
934 | error: | |
935 | return ret; | |
936 | } | |
937 | ||
938 | /* | |
939 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
940 | */ | |
941 | int cmd_add_context(struct ltt_session *session, int domain, | |
979e618e DG |
942 | char *channel_name, char *event_name, struct lttng_event_context *ctx, |
943 | int kwpipe) | |
2f77fc4b DG |
944 | { |
945 | int ret; | |
946 | ||
947 | switch (domain) { | |
948 | case LTTNG_DOMAIN_KERNEL: | |
979e618e DG |
949 | assert(session->kernel_session); |
950 | ||
951 | if (session->kernel_session->channel_count == 0) { | |
952 | /* Create default channel */ | |
953 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); | |
954 | if (ret != LTTNG_OK) { | |
955 | goto error; | |
956 | } | |
957 | } | |
958 | ||
2f77fc4b DG |
959 | /* Add kernel context to kernel tracer */ |
960 | ret = context_kernel_add(session->kernel_session, ctx, | |
961 | event_name, channel_name); | |
f73fabfd | 962 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
963 | goto error; |
964 | } | |
965 | break; | |
966 | case LTTNG_DOMAIN_UST: | |
967 | { | |
968 | struct ltt_ust_session *usess = session->ust_session; | |
2f77fc4b DG |
969 | assert(usess); |
970 | ||
979e618e DG |
971 | unsigned int chan_count = |
972 | lttng_ht_get_count(usess->domain_global.channels); | |
973 | if (chan_count == 0) { | |
974 | struct lttng_channel *attr; | |
975 | /* Create default channel */ | |
976 | attr = channel_new_default_attr(domain); | |
977 | if (attr == NULL) { | |
978 | ret = LTTNG_ERR_FATAL; | |
979 | goto error; | |
980 | } | |
981 | ||
982 | ret = channel_ust_create(usess, domain, attr); | |
983 | if (ret != LTTNG_OK) { | |
984 | free(attr); | |
985 | goto error; | |
986 | } | |
987 | free(attr); | |
988 | } | |
989 | ||
990 | ||
2f77fc4b | 991 | ret = context_ust_add(usess, domain, ctx, event_name, channel_name); |
f73fabfd | 992 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
993 | goto error; |
994 | } | |
995 | break; | |
996 | } | |
997 | #if 0 | |
998 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
999 | case LTTNG_DOMAIN_UST_PID: | |
1000 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
1001 | #endif | |
1002 | default: | |
f73fabfd | 1003 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1004 | goto error; |
1005 | } | |
1006 | ||
f73fabfd | 1007 | ret = LTTNG_OK; |
2f77fc4b DG |
1008 | |
1009 | error: | |
1010 | return ret; | |
1011 | } | |
1012 | ||
1013 | /* | |
1014 | * Command LTTNG_SET_FILTER processed by the client thread. | |
1015 | */ | |
1016 | int cmd_set_filter(struct ltt_session *session, int domain, | |
1017 | char *channel_name, char *event_name, | |
1018 | struct lttng_filter_bytecode *bytecode) | |
1019 | { | |
1020 | int ret; | |
1021 | ||
1022 | switch (domain) { | |
1023 | case LTTNG_DOMAIN_KERNEL: | |
f73fabfd | 1024 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1025 | break; |
1026 | case LTTNG_DOMAIN_UST: | |
1027 | { | |
1028 | struct ltt_ust_session *usess = session->ust_session; | |
1029 | ||
1030 | ret = filter_ust_set(usess, domain, bytecode, event_name, channel_name); | |
f73fabfd | 1031 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1032 | goto error; |
1033 | } | |
1034 | break; | |
1035 | } | |
1036 | #if 0 | |
1037 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
1038 | case LTTNG_DOMAIN_UST_PID: | |
1039 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
1040 | #endif | |
1041 | default: | |
f73fabfd | 1042 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1043 | goto error; |
1044 | } | |
1045 | ||
f73fabfd | 1046 | ret = LTTNG_OK; |
2f77fc4b DG |
1047 | |
1048 | error: | |
1049 | return ret; | |
1050 | ||
1051 | } | |
1052 | ||
1053 | ||
1054 | /* | |
1055 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
1056 | */ | |
1057 | int cmd_enable_event(struct ltt_session *session, int domain, | |
1058 | char *channel_name, struct lttng_event *event, int wpipe) | |
1059 | { | |
1060 | int ret; | |
1061 | struct lttng_channel *attr; | |
1062 | ||
1063 | assert(session); | |
1064 | assert(event); | |
1065 | assert(channel_name); | |
1066 | ||
1067 | switch (domain) { | |
1068 | case LTTNG_DOMAIN_KERNEL: | |
1069 | { | |
1070 | struct ltt_kernel_channel *kchan; | |
1071 | ||
1072 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1073 | session->kernel_session); | |
1074 | if (kchan == NULL) { | |
1075 | attr = channel_new_default_attr(domain); | |
1076 | if (attr == NULL) { | |
f73fabfd | 1077 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1078 | goto error; |
1079 | } | |
1080 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1081 | ||
1082 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1083 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1084 | free(attr); |
1085 | goto error; | |
1086 | } | |
1087 | free(attr); | |
1088 | } | |
1089 | ||
1090 | /* Get the newly created kernel channel pointer */ | |
1091 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1092 | session->kernel_session); | |
1093 | if (kchan == NULL) { | |
1094 | /* This sould not happen... */ | |
f73fabfd | 1095 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1096 | goto error; |
1097 | } | |
1098 | ||
1099 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, | |
1100 | event); | |
f73fabfd | 1101 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1102 | goto error; |
1103 | } | |
1104 | ||
1105 | kernel_wait_quiescent(kernel_tracer_fd); | |
1106 | break; | |
1107 | } | |
1108 | case LTTNG_DOMAIN_UST: | |
1109 | { | |
1110 | struct ltt_ust_channel *uchan; | |
1111 | struct ltt_ust_session *usess = session->ust_session; | |
1112 | ||
1113 | assert(usess); | |
1114 | ||
1115 | /* Get channel from global UST domain */ | |
1116 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
1117 | channel_name); | |
1118 | if (uchan == NULL) { | |
1119 | /* Create default channel */ | |
1120 | attr = channel_new_default_attr(domain); | |
1121 | if (attr == NULL) { | |
f73fabfd | 1122 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1123 | goto error; |
1124 | } | |
1125 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1126 | ||
1127 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1128 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1129 | free(attr); |
1130 | goto error; | |
1131 | } | |
1132 | free(attr); | |
1133 | ||
1134 | /* Get the newly created channel reference back */ | |
1135 | uchan = trace_ust_find_channel_by_name( | |
1136 | usess->domain_global.channels, channel_name); | |
1137 | assert(uchan); | |
1138 | } | |
1139 | ||
1140 | /* At this point, the session and channel exist on the tracer */ | |
1141 | ret = event_ust_enable_tracepoint(usess, domain, uchan, event); | |
f73fabfd | 1142 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1143 | goto error; |
1144 | } | |
1145 | break; | |
1146 | } | |
1147 | #if 0 | |
1148 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
1149 | case LTTNG_DOMAIN_UST_PID: | |
1150 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
1151 | #endif | |
1152 | default: | |
f73fabfd | 1153 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1154 | goto error; |
1155 | } | |
1156 | ||
f73fabfd | 1157 | ret = LTTNG_OK; |
2f77fc4b DG |
1158 | |
1159 | error: | |
1160 | return ret; | |
1161 | } | |
1162 | ||
1163 | /* | |
1164 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
1165 | */ | |
1166 | int cmd_enable_event_all(struct ltt_session *session, int domain, | |
1167 | char *channel_name, int event_type, int wpipe) | |
1168 | { | |
1169 | int ret; | |
1170 | struct lttng_channel *attr; | |
1171 | ||
1172 | assert(session); | |
1173 | assert(channel_name); | |
1174 | ||
1175 | switch (domain) { | |
1176 | case LTTNG_DOMAIN_KERNEL: | |
1177 | { | |
1178 | struct ltt_kernel_channel *kchan; | |
1179 | ||
1180 | assert(session->kernel_session); | |
1181 | ||
1182 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1183 | session->kernel_session); | |
1184 | if (kchan == NULL) { | |
1185 | /* Create default channel */ | |
1186 | attr = channel_new_default_attr(domain); | |
1187 | if (attr == NULL) { | |
f73fabfd | 1188 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1189 | goto error; |
1190 | } | |
1191 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1192 | ||
1193 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1194 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1195 | free(attr); |
1196 | goto error; | |
1197 | } | |
1198 | free(attr); | |
1199 | ||
1200 | /* Get the newly created kernel channel pointer */ | |
1201 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1202 | session->kernel_session); | |
1203 | assert(kchan); | |
1204 | } | |
1205 | ||
1206 | switch (event_type) { | |
1207 | case LTTNG_EVENT_SYSCALL: | |
1208 | ret = event_kernel_enable_all_syscalls(session->kernel_session, | |
1209 | kchan, kernel_tracer_fd); | |
1210 | break; | |
1211 | case LTTNG_EVENT_TRACEPOINT: | |
1212 | /* | |
1213 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and | |
1214 | * events already registered to the channel. | |
1215 | */ | |
1216 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, | |
1217 | kchan, kernel_tracer_fd); | |
1218 | break; | |
1219 | case LTTNG_EVENT_ALL: | |
1220 | /* Enable syscalls and tracepoints */ | |
1221 | ret = event_kernel_enable_all(session->kernel_session, | |
1222 | kchan, kernel_tracer_fd); | |
1223 | break; | |
1224 | default: | |
f73fabfd | 1225 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
2f77fc4b DG |
1226 | goto error; |
1227 | } | |
1228 | ||
1229 | /* Manage return value */ | |
f73fabfd | 1230 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1231 | goto error; |
1232 | } | |
1233 | ||
1234 | kernel_wait_quiescent(kernel_tracer_fd); | |
1235 | break; | |
1236 | } | |
1237 | case LTTNG_DOMAIN_UST: | |
1238 | { | |
1239 | struct ltt_ust_channel *uchan; | |
1240 | struct ltt_ust_session *usess = session->ust_session; | |
1241 | ||
1242 | assert(usess); | |
1243 | ||
1244 | /* Get channel from global UST domain */ | |
1245 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
1246 | channel_name); | |
1247 | if (uchan == NULL) { | |
1248 | /* Create default channel */ | |
1249 | attr = channel_new_default_attr(domain); | |
1250 | if (attr == NULL) { | |
f73fabfd | 1251 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1252 | goto error; |
1253 | } | |
1254 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1255 | ||
1256 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1257 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1258 | free(attr); |
1259 | goto error; | |
1260 | } | |
1261 | free(attr); | |
1262 | ||
1263 | /* Get the newly created channel reference back */ | |
1264 | uchan = trace_ust_find_channel_by_name( | |
1265 | usess->domain_global.channels, channel_name); | |
1266 | assert(uchan); | |
1267 | } | |
1268 | ||
1269 | /* At this point, the session and channel exist on the tracer */ | |
1270 | ||
1271 | switch (event_type) { | |
1272 | case LTTNG_EVENT_ALL: | |
1273 | case LTTNG_EVENT_TRACEPOINT: | |
1274 | ret = event_ust_enable_all_tracepoints(usess, domain, uchan); | |
f73fabfd | 1275 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1276 | goto error; |
1277 | } | |
1278 | break; | |
1279 | default: | |
f73fabfd | 1280 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
2f77fc4b DG |
1281 | goto error; |
1282 | } | |
1283 | ||
1284 | /* Manage return value */ | |
f73fabfd | 1285 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1286 | goto error; |
1287 | } | |
1288 | ||
1289 | break; | |
1290 | } | |
1291 | #if 0 | |
1292 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
1293 | case LTTNG_DOMAIN_UST_PID: | |
1294 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
1295 | #endif | |
1296 | default: | |
f73fabfd | 1297 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1298 | goto error; |
1299 | } | |
1300 | ||
f73fabfd | 1301 | ret = LTTNG_OK; |
2f77fc4b DG |
1302 | |
1303 | error: | |
1304 | return ret; | |
1305 | } | |
1306 | ||
1307 | ||
1308 | /* | |
1309 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
1310 | */ | |
1311 | ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
1312 | { | |
1313 | int ret; | |
1314 | ssize_t nb_events = 0; | |
1315 | ||
1316 | switch (domain) { | |
1317 | case LTTNG_DOMAIN_KERNEL: | |
1318 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
1319 | if (nb_events < 0) { | |
f73fabfd | 1320 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
2f77fc4b DG |
1321 | goto error; |
1322 | } | |
1323 | break; | |
1324 | case LTTNG_DOMAIN_UST: | |
1325 | nb_events = ust_app_list_events(events); | |
1326 | if (nb_events < 0) { | |
f73fabfd | 1327 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
1328 | goto error; |
1329 | } | |
1330 | break; | |
1331 | default: | |
f73fabfd | 1332 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1333 | goto error; |
1334 | } | |
1335 | ||
1336 | return nb_events; | |
1337 | ||
1338 | error: | |
1339 | /* Return negative value to differentiate return code */ | |
1340 | return -ret; | |
1341 | } | |
1342 | ||
1343 | /* | |
1344 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
1345 | */ | |
1346 | ssize_t cmd_list_tracepoint_fields(int domain, | |
1347 | struct lttng_event_field **fields) | |
1348 | { | |
1349 | int ret; | |
1350 | ssize_t nb_fields = 0; | |
1351 | ||
1352 | switch (domain) { | |
1353 | case LTTNG_DOMAIN_UST: | |
1354 | nb_fields = ust_app_list_event_fields(fields); | |
1355 | if (nb_fields < 0) { | |
f73fabfd | 1356 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
1357 | goto error; |
1358 | } | |
1359 | break; | |
1360 | case LTTNG_DOMAIN_KERNEL: | |
1361 | default: /* fall-through */ | |
f73fabfd | 1362 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1363 | goto error; |
1364 | } | |
1365 | ||
1366 | return nb_fields; | |
1367 | ||
1368 | error: | |
1369 | /* Return negative value to differentiate return code */ | |
1370 | return -ret; | |
1371 | } | |
1372 | ||
1373 | /* | |
1374 | * Command LTTNG_START_TRACE processed by the client thread. | |
1375 | */ | |
1376 | int cmd_start_trace(struct ltt_session *session) | |
1377 | { | |
1378 | int ret; | |
1379 | struct ltt_kernel_session *ksession; | |
1380 | struct ltt_ust_session *usess; | |
1381 | struct ltt_kernel_channel *kchan; | |
1382 | ||
1383 | assert(session); | |
1384 | ||
1385 | /* Ease our life a bit ;) */ | |
1386 | ksession = session->kernel_session; | |
1387 | usess = session->ust_session; | |
1388 | ||
1389 | if (session->enabled) { | |
1390 | /* Already started. */ | |
f73fabfd | 1391 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
1392 | goto error; |
1393 | } | |
1394 | ||
1395 | session->enabled = 1; | |
1396 | ||
1397 | ret = setup_relayd(session); | |
f73fabfd | 1398 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1399 | ERR("Error setting up relayd for session %s", session->name); |
1400 | goto error; | |
1401 | } | |
1402 | ||
1403 | /* Kernel tracing */ | |
1404 | if (ksession != NULL) { | |
1405 | /* Open kernel metadata */ | |
1406 | if (ksession->metadata == NULL) { | |
1407 | ret = kernel_open_metadata(ksession); | |
1408 | if (ret < 0) { | |
f73fabfd | 1409 | ret = LTTNG_ERR_KERN_META_FAIL; |
2f77fc4b DG |
1410 | goto error; |
1411 | } | |
1412 | } | |
1413 | ||
1414 | /* Open kernel metadata stream */ | |
1415 | if (ksession->metadata_stream_fd < 0) { | |
1416 | ret = kernel_open_metadata_stream(ksession); | |
1417 | if (ret < 0) { | |
1418 | ERR("Kernel create metadata stream failed"); | |
f73fabfd | 1419 | ret = LTTNG_ERR_KERN_STREAM_FAIL; |
2f77fc4b DG |
1420 | goto error; |
1421 | } | |
1422 | } | |
1423 | ||
1424 | /* For each channel */ | |
1425 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
1426 | if (kchan->stream_count == 0) { | |
1427 | ret = kernel_open_channel_stream(kchan); | |
1428 | if (ret < 0) { | |
f73fabfd | 1429 | ret = LTTNG_ERR_KERN_STREAM_FAIL; |
2f77fc4b DG |
1430 | goto error; |
1431 | } | |
1432 | /* Update the stream global counter */ | |
1433 | ksession->stream_count_global += ret; | |
1434 | } | |
1435 | } | |
1436 | ||
1437 | /* Setup kernel consumer socket and send fds to it */ | |
1438 | ret = init_kernel_tracing(ksession); | |
1439 | if (ret < 0) { | |
f73fabfd | 1440 | ret = LTTNG_ERR_KERN_START_FAIL; |
2f77fc4b DG |
1441 | goto error; |
1442 | } | |
1443 | ||
1444 | /* This start the kernel tracing */ | |
1445 | ret = kernel_start_session(ksession); | |
1446 | if (ret < 0) { | |
f73fabfd | 1447 | ret = LTTNG_ERR_KERN_START_FAIL; |
2f77fc4b DG |
1448 | goto error; |
1449 | } | |
1450 | ||
1451 | /* Quiescent wait after starting trace */ | |
1452 | kernel_wait_quiescent(kernel_tracer_fd); | |
1453 | } | |
1454 | ||
1455 | /* Flag session that trace should start automatically */ | |
1456 | if (usess) { | |
1457 | usess->start_trace = 1; | |
1458 | ||
1459 | ret = ust_app_start_trace_all(usess); | |
1460 | if (ret < 0) { | |
f73fabfd | 1461 | ret = LTTNG_ERR_UST_START_FAIL; |
2f77fc4b DG |
1462 | goto error; |
1463 | } | |
1464 | } | |
1465 | ||
f73fabfd | 1466 | ret = LTTNG_OK; |
2f77fc4b DG |
1467 | |
1468 | error: | |
1469 | return ret; | |
1470 | } | |
1471 | ||
1472 | /* | |
1473 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
1474 | */ | |
1475 | int cmd_stop_trace(struct ltt_session *session) | |
1476 | { | |
1477 | int ret; | |
1478 | struct ltt_kernel_channel *kchan; | |
1479 | struct ltt_kernel_session *ksession; | |
1480 | struct ltt_ust_session *usess; | |
1481 | ||
1482 | assert(session); | |
1483 | ||
1484 | /* Short cut */ | |
1485 | ksession = session->kernel_session; | |
1486 | usess = session->ust_session; | |
1487 | ||
1488 | if (!session->enabled) { | |
f73fabfd | 1489 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
2f77fc4b DG |
1490 | goto error; |
1491 | } | |
1492 | ||
1493 | session->enabled = 0; | |
1494 | ||
1495 | /* Kernel tracer */ | |
1496 | if (ksession) { | |
1497 | DBG("Stop kernel tracing"); | |
1498 | ||
1499 | /* Flush metadata if exist */ | |
1500 | if (ksession->metadata_stream_fd >= 0) { | |
1501 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
1502 | if (ret < 0) { | |
1503 | ERR("Kernel metadata flush failed"); | |
1504 | } | |
1505 | } | |
1506 | ||
1507 | /* Flush all buffers before stopping */ | |
1508 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
1509 | ret = kernel_flush_buffer(kchan); | |
1510 | if (ret < 0) { | |
1511 | ERR("Kernel flush buffer error"); | |
1512 | } | |
1513 | } | |
1514 | ||
1515 | ret = kernel_stop_session(ksession); | |
1516 | if (ret < 0) { | |
f73fabfd | 1517 | ret = LTTNG_ERR_KERN_STOP_FAIL; |
2f77fc4b DG |
1518 | goto error; |
1519 | } | |
1520 | ||
1521 | kernel_wait_quiescent(kernel_tracer_fd); | |
1522 | } | |
1523 | ||
1524 | if (usess) { | |
1525 | usess->start_trace = 0; | |
1526 | ||
1527 | ret = ust_app_stop_trace_all(usess); | |
1528 | if (ret < 0) { | |
f73fabfd | 1529 | ret = LTTNG_ERR_UST_STOP_FAIL; |
2f77fc4b DG |
1530 | goto error; |
1531 | } | |
1532 | } | |
1533 | ||
f73fabfd | 1534 | ret = LTTNG_OK; |
2f77fc4b DG |
1535 | |
1536 | error: | |
1537 | return ret; | |
1538 | } | |
1539 | ||
1540 | /* | |
1541 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
1542 | */ | |
1543 | int cmd_set_consumer_uri(int domain, struct ltt_session *session, | |
1544 | size_t nb_uri, struct lttng_uri *uris) | |
1545 | { | |
1546 | int ret, i; | |
1547 | struct ltt_kernel_session *ksess = session->kernel_session; | |
1548 | struct ltt_ust_session *usess = session->ust_session; | |
1549 | struct consumer_output *consumer = NULL; | |
1550 | ||
1551 | assert(session); | |
1552 | assert(uris); | |
1553 | assert(nb_uri > 0); | |
1554 | ||
1555 | /* Can't enable consumer after session started. */ | |
1556 | if (session->enabled) { | |
f73fabfd | 1557 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
1558 | goto error; |
1559 | } | |
1560 | ||
2f77fc4b DG |
1561 | /* |
1562 | * This case switch makes sure the domain session has a temporary consumer | |
1563 | * so the URL can be set. | |
1564 | */ | |
1565 | switch (domain) { | |
1566 | case 0: | |
1567 | /* Code flow error. A session MUST always have a consumer object */ | |
1568 | assert(session->consumer); | |
1569 | /* | |
1570 | * The URL will be added to the tracing session consumer instead of a | |
1571 | * specific domain consumer. | |
1572 | */ | |
1573 | consumer = session->consumer; | |
1574 | break; | |
1575 | case LTTNG_DOMAIN_KERNEL: | |
1576 | /* Code flow error if we don't have a kernel session here. */ | |
1577 | assert(ksess); | |
1578 | ||
1579 | /* Create consumer output if none exists */ | |
1580 | consumer = ksess->tmp_consumer; | |
1581 | if (consumer == NULL) { | |
1582 | consumer = consumer_copy_output(ksess->consumer); | |
1583 | if (consumer == NULL) { | |
f73fabfd | 1584 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1585 | goto error; |
1586 | } | |
1587 | /* Trash the consumer subdir, we are about to set a new one. */ | |
1588 | memset(consumer->subdir, 0, sizeof(consumer->subdir)); | |
1589 | ksess->tmp_consumer = consumer; | |
1590 | } | |
1591 | ||
1592 | break; | |
1593 | case LTTNG_DOMAIN_UST: | |
1594 | /* Code flow error if we don't have a kernel session here. */ | |
1595 | assert(usess); | |
1596 | ||
1597 | /* Create consumer output if none exists */ | |
1598 | consumer = usess->tmp_consumer; | |
1599 | if (consumer == NULL) { | |
1600 | consumer = consumer_copy_output(usess->consumer); | |
1601 | if (consumer == NULL) { | |
f73fabfd | 1602 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1603 | goto error; |
1604 | } | |
1605 | /* Trash the consumer subdir, we are about to set a new one. */ | |
1606 | memset(consumer->subdir, 0, sizeof(consumer->subdir)); | |
1607 | usess->tmp_consumer = consumer; | |
1608 | } | |
1609 | ||
1610 | break; | |
1611 | } | |
1612 | ||
1613 | for (i = 0; i < nb_uri; i++) { | |
1614 | struct consumer_socket *socket; | |
1615 | struct lttng_ht_iter iter; | |
1616 | ||
1617 | ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name); | |
1618 | if (ret < 0) { | |
1619 | goto error; | |
1620 | } | |
1621 | ||
1622 | /* | |
1623 | * Don't send relayd socket if URI is NOT remote or if the relayd | |
c890b720 | 1624 | * socket for the session was already sent. |
2f77fc4b DG |
1625 | */ |
1626 | if (uris[i].dtype == LTTNG_DST_PATH || | |
c890b720 DG |
1627 | (uris[i].stype == LTTNG_STREAM_CONTROL && |
1628 | consumer->dst.net.control_sock_sent) || | |
1629 | (uris[i].stype == LTTNG_STREAM_DATA && | |
1630 | consumer->dst.net.data_sock_sent)) { | |
2f77fc4b DG |
1631 | continue; |
1632 | } | |
1633 | ||
1634 | /* Try to send relayd URI to the consumer if exist. */ | |
1635 | rcu_read_lock(); | |
1636 | cds_lfht_for_each_entry(consumer->socks->ht, &iter.iter, | |
1637 | socket, node.node) { | |
1638 | ||
1639 | /* A socket in the HT should never have a negative fd */ | |
1640 | assert(socket->fd >= 0); | |
1641 | ||
1642 | pthread_mutex_lock(socket->lock); | |
1643 | ret = send_consumer_relayd_socket(domain, session, &uris[i], | |
1644 | consumer, socket->fd); | |
1645 | pthread_mutex_unlock(socket->lock); | |
f73fabfd | 1646 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1647 | rcu_read_unlock(); |
1648 | goto error; | |
1649 | } | |
1650 | } | |
1651 | rcu_read_unlock(); | |
1652 | } | |
1653 | ||
1654 | /* All good! */ | |
f73fabfd | 1655 | ret = LTTNG_OK; |
2f77fc4b DG |
1656 | |
1657 | error: | |
1658 | return ret; | |
1659 | } | |
1660 | ||
1661 | /* | |
1662 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
1663 | */ | |
1664 | int cmd_create_session_uri(char *name, struct lttng_uri *uris, | |
1665 | size_t nb_uri, lttng_sock_cred *creds) | |
1666 | { | |
1667 | int ret; | |
1668 | char *path = NULL; | |
1669 | struct ltt_session *session; | |
1670 | ||
1671 | assert(name); | |
1672 | ||
1673 | /* | |
1674 | * Verify if the session already exist | |
1675 | * | |
1676 | * XXX: There is no need for the session lock list here since the caller | |
1677 | * (process_client_msg) is holding it. We might want to change that so a | |
1678 | * single command does not lock the entire session list. | |
1679 | */ | |
1680 | session = session_find_by_name(name); | |
1681 | if (session != NULL) { | |
f73fabfd | 1682 | ret = LTTNG_ERR_EXIST_SESS; |
2f77fc4b DG |
1683 | goto find_error; |
1684 | } | |
1685 | ||
1686 | /* Create tracing session in the registry */ | |
1687 | ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds), | |
1688 | LTTNG_SOCK_GET_GID_CRED(creds)); | |
f73fabfd | 1689 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1690 | goto session_error; |
1691 | } | |
1692 | ||
1693 | /* | |
1694 | * Get the newly created session pointer back | |
1695 | * | |
1696 | * XXX: There is no need for the session lock list here since the caller | |
1697 | * (process_client_msg) is holding it. We might want to change that so a | |
1698 | * single command does not lock the entire session list. | |
1699 | */ | |
1700 | session = session_find_by_name(name); | |
1701 | assert(session); | |
1702 | ||
1703 | /* Create default consumer output for the session not yet created. */ | |
1704 | session->consumer = consumer_create_output(CONSUMER_DST_LOCAL); | |
1705 | if (session->consumer == NULL) { | |
f73fabfd | 1706 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1707 | goto consumer_error; |
1708 | } | |
1709 | ||
1710 | /* | |
1711 | * This means that the lttng_create_session call was called with the _path_ | |
1712 | * argument set to NULL. | |
1713 | */ | |
1714 | if (uris == NULL) { | |
1715 | /* | |
1716 | * At this point, we'll skip the consumer URI setup and create a | |
1717 | * session with a NULL path which will flag the session to NOT spawn a | |
1718 | * consumer. | |
1719 | */ | |
1720 | DBG("Create session %s with NO uri, skipping consumer setup", name); | |
1721 | goto end; | |
1722 | } | |
1723 | ||
1724 | session->start_consumer = 1; | |
1725 | ||
1726 | ret = cmd_set_consumer_uri(0, session, nb_uri, uris); | |
f73fabfd | 1727 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1728 | goto consumer_error; |
1729 | } | |
1730 | ||
1731 | session->consumer->enabled = 1; | |
1732 | ||
1733 | end: | |
f73fabfd | 1734 | return LTTNG_OK; |
2f77fc4b DG |
1735 | |
1736 | consumer_error: | |
1737 | session_destroy(session); | |
1738 | session_error: | |
1739 | find_error: | |
1740 | return ret; | |
1741 | } | |
1742 | ||
1743 | /* | |
1744 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
1745 | */ | |
1746 | int cmd_destroy_session(struct ltt_session *session, int wpipe) | |
1747 | { | |
1748 | int ret; | |
1749 | struct ltt_ust_session *usess; | |
1750 | struct ltt_kernel_session *ksess; | |
1751 | ||
1752 | /* Safety net */ | |
1753 | assert(session); | |
1754 | ||
1755 | usess = session->ust_session; | |
1756 | ksess = session->kernel_session; | |
1757 | ||
1758 | /* Clean kernel session teardown */ | |
1759 | kernel_destroy_session(ksess); | |
1760 | ||
1761 | /* UST session teardown */ | |
1762 | if (usess) { | |
1763 | /* Close any relayd session */ | |
1764 | consumer_output_send_destroy_relayd(usess->consumer); | |
1765 | ||
1766 | /* Destroy every UST application related to this session. */ | |
1767 | ret = ust_app_destroy_trace_all(usess); | |
1768 | if (ret) { | |
1769 | ERR("Error in ust_app_destroy_trace_all"); | |
1770 | } | |
1771 | ||
1772 | /* Clean up the rest. */ | |
1773 | trace_ust_destroy_session(usess); | |
1774 | } | |
1775 | ||
1776 | /* | |
1777 | * Must notify the kernel thread here to update it's poll set in order to | |
1778 | * remove the channel(s)' fd just destroyed. | |
1779 | */ | |
1780 | ret = notify_thread_pipe(wpipe); | |
1781 | if (ret < 0) { | |
1782 | PERROR("write kernel poll pipe"); | |
1783 | } | |
1784 | ||
1785 | ret = session_destroy(session); | |
1786 | ||
1787 | return ret; | |
1788 | } | |
1789 | ||
1790 | /* | |
1791 | * Command LTTNG_CALIBRATE processed by the client thread. | |
1792 | */ | |
1793 | int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
1794 | { | |
1795 | int ret; | |
1796 | ||
1797 | switch (domain) { | |
1798 | case LTTNG_DOMAIN_KERNEL: | |
1799 | { | |
1800 | struct lttng_kernel_calibrate kcalibrate; | |
1801 | ||
1802 | kcalibrate.type = calibrate->type; | |
1803 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
1804 | if (ret < 0) { | |
f73fabfd | 1805 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
2f77fc4b DG |
1806 | goto error; |
1807 | } | |
1808 | break; | |
1809 | } | |
1810 | case LTTNG_DOMAIN_UST: | |
1811 | { | |
1812 | struct lttng_ust_calibrate ucalibrate; | |
1813 | ||
1814 | ucalibrate.type = calibrate->type; | |
1815 | ret = ust_app_calibrate_glb(&ucalibrate); | |
1816 | if (ret < 0) { | |
f73fabfd | 1817 | ret = LTTNG_ERR_UST_CALIBRATE_FAIL; |
2f77fc4b DG |
1818 | goto error; |
1819 | } | |
1820 | break; | |
1821 | } | |
1822 | default: | |
f73fabfd | 1823 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1824 | goto error; |
1825 | } | |
1826 | ||
f73fabfd | 1827 | ret = LTTNG_OK; |
2f77fc4b DG |
1828 | |
1829 | error: | |
1830 | return ret; | |
1831 | } | |
1832 | ||
1833 | /* | |
1834 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
1835 | */ | |
1836 | int cmd_register_consumer(struct ltt_session *session, int domain, | |
1837 | const char *sock_path, struct consumer_data *cdata) | |
1838 | { | |
1839 | int ret, sock; | |
1840 | struct consumer_socket *socket; | |
1841 | ||
1842 | assert(session); | |
1843 | assert(cdata); | |
1844 | assert(sock_path); | |
1845 | ||
1846 | switch (domain) { | |
1847 | case LTTNG_DOMAIN_KERNEL: | |
1848 | { | |
1849 | struct ltt_kernel_session *ksess = session->kernel_session; | |
1850 | ||
1851 | assert(ksess); | |
1852 | ||
1853 | /* Can't register a consumer if there is already one */ | |
1854 | if (ksess->consumer_fds_sent != 0) { | |
f73fabfd | 1855 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
1856 | goto error; |
1857 | } | |
1858 | ||
1859 | sock = lttcomm_connect_unix_sock(sock_path); | |
1860 | if (sock < 0) { | |
f73fabfd | 1861 | ret = LTTNG_ERR_CONNECT_FAIL; |
2f77fc4b DG |
1862 | goto error; |
1863 | } | |
1864 | ||
1865 | socket = consumer_allocate_socket(sock); | |
1866 | if (socket == NULL) { | |
f73fabfd | 1867 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1868 | close(sock); |
1869 | goto error; | |
1870 | } | |
1871 | ||
1872 | socket->lock = zmalloc(sizeof(pthread_mutex_t)); | |
1873 | if (socket->lock == NULL) { | |
1874 | PERROR("zmalloc pthread mutex"); | |
f73fabfd | 1875 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1876 | goto error; |
1877 | } | |
1878 | pthread_mutex_init(socket->lock, NULL); | |
1879 | socket->registered = 1; | |
1880 | ||
1881 | rcu_read_lock(); | |
1882 | consumer_add_socket(socket, ksess->consumer); | |
1883 | rcu_read_unlock(); | |
1884 | ||
1885 | pthread_mutex_lock(&cdata->pid_mutex); | |
1886 | cdata->pid = -1; | |
1887 | pthread_mutex_unlock(&cdata->pid_mutex); | |
1888 | ||
1889 | break; | |
1890 | } | |
1891 | default: | |
1892 | /* TODO: Userspace tracing */ | |
f73fabfd | 1893 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1894 | goto error; |
1895 | } | |
1896 | ||
f73fabfd | 1897 | ret = LTTNG_OK; |
2f77fc4b DG |
1898 | |
1899 | error: | |
1900 | return ret; | |
1901 | } | |
1902 | ||
1903 | /* | |
1904 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
1905 | */ | |
1906 | ssize_t cmd_list_domains(struct ltt_session *session, | |
1907 | struct lttng_domain **domains) | |
1908 | { | |
1909 | int ret, index = 0; | |
1910 | ssize_t nb_dom = 0; | |
1911 | ||
1912 | if (session->kernel_session != NULL) { | |
1913 | DBG3("Listing domains found kernel domain"); | |
1914 | nb_dom++; | |
1915 | } | |
1916 | ||
1917 | if (session->ust_session != NULL) { | |
1918 | DBG3("Listing domains found UST global domain"); | |
1919 | nb_dom++; | |
1920 | } | |
1921 | ||
1922 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); | |
1923 | if (*domains == NULL) { | |
f73fabfd | 1924 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1925 | goto error; |
1926 | } | |
1927 | ||
1928 | if (session->kernel_session != NULL) { | |
1929 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
1930 | index++; | |
1931 | } | |
1932 | ||
1933 | if (session->ust_session != NULL) { | |
1934 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
1935 | index++; | |
1936 | } | |
1937 | ||
1938 | return nb_dom; | |
1939 | ||
1940 | error: | |
f73fabfd DG |
1941 | /* Return negative value to differentiate return code */ |
1942 | return -ret; | |
2f77fc4b DG |
1943 | } |
1944 | ||
1945 | ||
1946 | /* | |
1947 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
1948 | */ | |
1949 | ssize_t cmd_list_channels(int domain, struct ltt_session *session, | |
1950 | struct lttng_channel **channels) | |
1951 | { | |
1952 | int ret; | |
1953 | ssize_t nb_chan = 0; | |
1954 | ||
1955 | switch (domain) { | |
1956 | case LTTNG_DOMAIN_KERNEL: | |
1957 | if (session->kernel_session != NULL) { | |
1958 | nb_chan = session->kernel_session->channel_count; | |
1959 | } | |
1960 | DBG3("Number of kernel channels %zd", nb_chan); | |
c7d620a2 DG |
1961 | if (nb_chan <= 0) { |
1962 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; | |
1963 | } | |
2f77fc4b DG |
1964 | break; |
1965 | case LTTNG_DOMAIN_UST: | |
1966 | if (session->ust_session != NULL) { | |
1967 | nb_chan = lttng_ht_get_count( | |
1968 | session->ust_session->domain_global.channels); | |
1969 | } | |
1970 | DBG3("Number of UST global channels %zd", nb_chan); | |
c7d620a2 DG |
1971 | if (nb_chan <= 0) { |
1972 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1973 | } | |
2f77fc4b DG |
1974 | break; |
1975 | default: | |
1976 | *channels = NULL; | |
f73fabfd | 1977 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1978 | goto error; |
1979 | } | |
1980 | ||
1981 | if (nb_chan > 0) { | |
1982 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
1983 | if (*channels == NULL) { | |
f73fabfd | 1984 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1985 | goto error; |
1986 | } | |
1987 | ||
1988 | list_lttng_channels(domain, session, *channels); | |
1989 | } else { | |
1990 | *channels = NULL; | |
c7d620a2 DG |
1991 | /* Ret value was set in the domain switch case */ |
1992 | goto error; | |
2f77fc4b DG |
1993 | } |
1994 | ||
1995 | return nb_chan; | |
1996 | ||
1997 | error: | |
f73fabfd DG |
1998 | /* Return negative value to differentiate return code */ |
1999 | return -ret; | |
2f77fc4b DG |
2000 | } |
2001 | ||
2002 | /* | |
2003 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
2004 | */ | |
2005 | ssize_t cmd_list_events(int domain, struct ltt_session *session, | |
2006 | char *channel_name, struct lttng_event **events) | |
2007 | { | |
2008 | int ret = 0; | |
2009 | ssize_t nb_event = 0; | |
2010 | ||
2011 | switch (domain) { | |
2012 | case LTTNG_DOMAIN_KERNEL: | |
2013 | if (session->kernel_session != NULL) { | |
2014 | nb_event = list_lttng_kernel_events(channel_name, | |
2015 | session->kernel_session, events); | |
2016 | } | |
2017 | break; | |
2018 | case LTTNG_DOMAIN_UST: | |
2019 | { | |
2020 | if (session->ust_session != NULL) { | |
2021 | nb_event = list_lttng_ust_global_events(channel_name, | |
2022 | &session->ust_session->domain_global, events); | |
2023 | } | |
2024 | break; | |
2025 | } | |
2026 | default: | |
f73fabfd | 2027 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2028 | goto error; |
2029 | } | |
2030 | ||
f73fabfd | 2031 | return nb_event; |
2f77fc4b DG |
2032 | |
2033 | error: | |
f73fabfd DG |
2034 | /* Return negative value to differentiate return code */ |
2035 | return -ret; | |
2f77fc4b DG |
2036 | } |
2037 | ||
2038 | /* | |
2039 | * Using the session list, filled a lttng_session array to send back to the | |
2040 | * client for session listing. | |
2041 | * | |
2042 | * The session list lock MUST be acquired before calling this function. Use | |
2043 | * session_lock_list() and session_unlock_list(). | |
2044 | */ | |
2045 | void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid, | |
2046 | gid_t gid) | |
2047 | { | |
2048 | int ret; | |
2049 | unsigned int i = 0; | |
2050 | struct ltt_session *session; | |
2051 | struct ltt_session_list *list = session_get_list(); | |
2052 | ||
2053 | DBG("Getting all available session for UID %d GID %d", | |
2054 | uid, gid); | |
2055 | /* | |
2056 | * Iterate over session list and append data after the control struct in | |
2057 | * the buffer. | |
2058 | */ | |
2059 | cds_list_for_each_entry(session, &list->head, list) { | |
2060 | /* | |
2061 | * Only list the sessions the user can control. | |
2062 | */ | |
2063 | if (!session_access_ok(session, uid, gid)) { | |
2064 | continue; | |
2065 | } | |
2066 | ||
2067 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2068 | struct ltt_ust_session *usess = session->ust_session; | |
2069 | ||
2070 | if (session->consumer->type == CONSUMER_DST_NET || | |
2071 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
2072 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
2073 | ret = build_network_session_path(sessions[i].path, | |
2074 | sizeof(session[i].path), session); | |
2075 | } else { | |
2076 | ret = snprintf(sessions[i].path, sizeof(session[i].path), "%s", | |
2077 | session->consumer->dst.trace_path); | |
2078 | } | |
2079 | if (ret < 0) { | |
2080 | PERROR("snprintf session path"); | |
2081 | continue; | |
2082 | } | |
2083 | ||
2084 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
2085 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
2086 | sessions[i].enabled = session->enabled; | |
2087 | i++; | |
2088 | } | |
2089 | } | |
2090 | ||
2091 | /* | |
2092 | * Command LTTNG_DISABLE_CONSUMER processed by the client thread. | |
2093 | */ | |
2094 | int cmd_disable_consumer(int domain, struct ltt_session *session) | |
2095 | { | |
2096 | int ret; | |
2097 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2098 | struct ltt_ust_session *usess = session->ust_session; | |
2099 | struct consumer_output *consumer; | |
2100 | ||
2101 | assert(session); | |
2102 | ||
2103 | if (session->enabled) { | |
2104 | /* Can't disable consumer on an already started session */ | |
f73fabfd | 2105 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2106 | goto error; |
2107 | } | |
2108 | ||
2109 | if (!session->start_consumer) { | |
f73fabfd | 2110 | ret = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
2111 | goto error; |
2112 | } | |
2113 | ||
2114 | switch (domain) { | |
2115 | case 0: | |
2116 | DBG("Disable tracing session %s consumer", session->name); | |
2117 | consumer = session->consumer; | |
2118 | break; | |
2119 | case LTTNG_DOMAIN_KERNEL: | |
2120 | /* Code flow error if we don't have a kernel session here. */ | |
2121 | assert(ksess); | |
2122 | ||
2123 | DBG("Disabling kernel consumer"); | |
2124 | consumer = ksess->consumer; | |
2125 | ||
2126 | break; | |
2127 | case LTTNG_DOMAIN_UST: | |
2128 | /* Code flow error if we don't have a UST session here. */ | |
2129 | assert(usess); | |
2130 | ||
2131 | DBG("Disabling UST consumer"); | |
2132 | consumer = usess->consumer; | |
2133 | ||
2134 | break; | |
2135 | default: | |
f73fabfd | 2136 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
2137 | goto error; |
2138 | } | |
2139 | ||
2140 | if (consumer) { | |
2141 | consumer->enabled = 0; | |
2142 | /* Success at this point */ | |
f73fabfd | 2143 | ret = LTTNG_OK; |
2f77fc4b | 2144 | } else { |
f73fabfd | 2145 | ret = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
2146 | } |
2147 | ||
2148 | error: | |
2149 | return ret; | |
2150 | } | |
2151 | ||
2152 | /* | |
2153 | * Command LTTNG_ENABLE_CONSUMER processed by the client thread. | |
2154 | */ | |
2155 | int cmd_enable_consumer(int domain, struct ltt_session *session) | |
2156 | { | |
2157 | int ret; | |
2158 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2159 | struct ltt_ust_session *usess = session->ust_session; | |
2160 | struct consumer_output *consumer = NULL; | |
2161 | ||
2162 | assert(session); | |
2163 | ||
2164 | /* Can't enable consumer after session started. */ | |
2165 | if (session->enabled) { | |
f73fabfd | 2166 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2167 | goto error; |
2168 | } | |
2169 | ||
2f77fc4b DG |
2170 | switch (domain) { |
2171 | case 0: | |
2172 | assert(session->consumer); | |
2173 | consumer = session->consumer; | |
2174 | break; | |
2175 | case LTTNG_DOMAIN_KERNEL: | |
2176 | /* Code flow error if we don't have a kernel session here. */ | |
2177 | assert(ksess); | |
2178 | ||
2179 | /* | |
2180 | * Check if we have already sent fds to the consumer. In that case, | |
2181 | * the enable-consumer command can't be used because a start trace | |
2182 | * had previously occured. | |
2183 | */ | |
2184 | if (ksess->consumer_fds_sent) { | |
f73fabfd | 2185 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
2186 | goto error; |
2187 | } | |
2188 | ||
2189 | consumer = ksess->tmp_consumer; | |
2190 | if (consumer == NULL) { | |
f73fabfd | 2191 | ret = LTTNG_OK; |
2f77fc4b DG |
2192 | /* No temp. consumer output exists. Using the current one. */ |
2193 | DBG3("No temporary consumer. Using default"); | |
2194 | consumer = ksess->consumer; | |
2195 | goto error; | |
2196 | } | |
2197 | ||
2198 | switch (consumer->type) { | |
2199 | case CONSUMER_DST_LOCAL: | |
2200 | DBG2("Consumer output is local. Creating directory(ies)"); | |
2201 | ||
2202 | /* Create directory(ies) */ | |
2203 | ret = run_as_mkdir_recursive(consumer->dst.trace_path, | |
2204 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
2205 | if (ret < 0) { | |
2206 | if (ret != -EEXIST) { | |
2207 | ERR("Trace directory creation error"); | |
f73fabfd | 2208 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2209 | goto error; |
2210 | } | |
2211 | } | |
2212 | break; | |
2213 | case CONSUMER_DST_NET: | |
2214 | DBG2("Consumer output is network. Validating URIs"); | |
2215 | /* Validate if we have both control and data path set. */ | |
2216 | if (!consumer->dst.net.control_isset) { | |
f73fabfd | 2217 | ret = LTTNG_ERR_URL_CTRL_MISS; |
2f77fc4b DG |
2218 | goto error; |
2219 | } | |
2220 | ||
2221 | if (!consumer->dst.net.data_isset) { | |
f73fabfd | 2222 | ret = LTTNG_ERR_URL_DATA_MISS; |
2f77fc4b DG |
2223 | goto error; |
2224 | } | |
2225 | ||
2226 | /* Check established network session state */ | |
2227 | if (session->net_handle == 0) { | |
f73fabfd | 2228 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
2229 | ERR("Session network handle is not set on enable-consumer"); |
2230 | goto error; | |
2231 | } | |
2232 | ||
2233 | break; | |
2234 | } | |
2235 | ||
2f77fc4b DG |
2236 | /* |
2237 | * @session-lock | |
2238 | * This is race free for now since the session lock is acquired before | |
2239 | * ending up in this function. No other threads can access this kernel | |
2240 | * session without this lock hence freeing the consumer output object | |
2241 | * is valid. | |
2242 | */ | |
2243 | rcu_read_lock(); | |
9a572cf5 | 2244 | /* Destroy current consumer. We are about to replace it */ |
2f77fc4b DG |
2245 | consumer_destroy_output(ksess->consumer); |
2246 | rcu_read_unlock(); | |
2247 | ksess->consumer = consumer; | |
2248 | ksess->tmp_consumer = NULL; | |
2249 | ||
2250 | break; | |
2251 | case LTTNG_DOMAIN_UST: | |
2252 | /* Code flow error if we don't have a UST session here. */ | |
2253 | assert(usess); | |
2254 | ||
2255 | /* | |
2256 | * Check if we have already sent fds to the consumer. In that case, | |
2257 | * the enable-consumer command can't be used because a start trace | |
2258 | * had previously occured. | |
2259 | */ | |
2260 | if (usess->start_trace) { | |
f73fabfd | 2261 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
2262 | goto error; |
2263 | } | |
2264 | ||
2265 | consumer = usess->tmp_consumer; | |
2266 | if (consumer == NULL) { | |
f73fabfd | 2267 | ret = LTTNG_OK; |
2f77fc4b DG |
2268 | /* No temp. consumer output exists. Using the current one. */ |
2269 | DBG3("No temporary consumer. Using default"); | |
2270 | consumer = usess->consumer; | |
2271 | goto error; | |
2272 | } | |
2273 | ||
2274 | switch (consumer->type) { | |
2275 | case CONSUMER_DST_LOCAL: | |
2276 | DBG2("Consumer output is local. Creating directory(ies)"); | |
2277 | ||
2278 | /* Create directory(ies) */ | |
2279 | ret = run_as_mkdir_recursive(consumer->dst.trace_path, | |
2280 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
2281 | if (ret < 0) { | |
2282 | if (ret != -EEXIST) { | |
2283 | ERR("Trace directory creation error"); | |
f73fabfd | 2284 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2285 | goto error; |
2286 | } | |
2287 | } | |
2288 | break; | |
2289 | case CONSUMER_DST_NET: | |
2290 | DBG2("Consumer output is network. Validating URIs"); | |
2291 | /* Validate if we have both control and data path set. */ | |
2292 | if (!consumer->dst.net.control_isset) { | |
f73fabfd | 2293 | ret = LTTNG_ERR_URL_CTRL_MISS; |
2f77fc4b DG |
2294 | goto error; |
2295 | } | |
2296 | ||
2297 | if (!consumer->dst.net.data_isset) { | |
f73fabfd | 2298 | ret = LTTNG_ERR_URL_DATA_MISS; |
2f77fc4b DG |
2299 | goto error; |
2300 | } | |
2301 | ||
2302 | /* Check established network session state */ | |
2303 | if (session->net_handle == 0) { | |
f73fabfd | 2304 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
2305 | DBG2("Session network handle is not set on enable-consumer"); |
2306 | goto error; | |
2307 | } | |
2308 | ||
2309 | if (consumer->net_seq_index == -1) { | |
f73fabfd | 2310 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
2311 | DBG2("Network index is not set on the consumer"); |
2312 | goto error; | |
2313 | } | |
2314 | ||
2315 | break; | |
2316 | } | |
2317 | ||
2f77fc4b DG |
2318 | /* |
2319 | * @session-lock | |
2320 | * This is race free for now since the session lock is acquired before | |
2321 | * ending up in this function. No other threads can access this kernel | |
2322 | * session without this lock hence freeing the consumer output object | |
2323 | * is valid. | |
2324 | */ | |
2325 | rcu_read_lock(); | |
9a572cf5 | 2326 | /* Destroy current consumer. We are about to replace it */ |
2f77fc4b DG |
2327 | consumer_destroy_output(usess->consumer); |
2328 | rcu_read_unlock(); | |
2329 | usess->consumer = consumer; | |
2330 | usess->tmp_consumer = NULL; | |
2331 | ||
2332 | break; | |
2333 | } | |
2334 | ||
4b35a6b3 DG |
2335 | session->start_consumer = 1; |
2336 | ||
2f77fc4b DG |
2337 | /* Enable it */ |
2338 | if (consumer) { | |
2339 | consumer->enabled = 1; | |
2340 | /* Success at this point */ | |
f73fabfd | 2341 | ret = LTTNG_OK; |
2f77fc4b DG |
2342 | } else { |
2343 | /* Should not really happend... */ | |
f73fabfd | 2344 | ret = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
2345 | } |
2346 | ||
2347 | error: | |
2348 | return ret; | |
2349 | } | |
2350 | ||
806e2684 | 2351 | /* |
6d805429 DG |
2352 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
2353 | * ready for trace analysis (or anykind of reader) or else 1 for pending data. | |
806e2684 | 2354 | */ |
6d805429 | 2355 | int cmd_data_pending(struct ltt_session *session) |
806e2684 DG |
2356 | { |
2357 | int ret; | |
2358 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2359 | struct ltt_ust_session *usess = session->ust_session; | |
2360 | ||
2361 | assert(session); | |
2362 | ||
2363 | /* Session MUST be stopped to ask for data availability. */ | |
2364 | if (session->enabled) { | |
2365 | ret = LTTNG_ERR_SESSION_STARTED; | |
2366 | goto error; | |
2367 | } | |
2368 | ||
2369 | if (ksess && ksess->consumer) { | |
6d805429 DG |
2370 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
2371 | if (ret == 1) { | |
806e2684 DG |
2372 | /* Data is still being extracted for the kernel. */ |
2373 | goto error; | |
2374 | } | |
2375 | } | |
2376 | ||
2377 | if (usess && usess->consumer) { | |
6d805429 DG |
2378 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
2379 | if (ret == 1) { | |
806e2684 DG |
2380 | /* Data is still being extracted for the kernel. */ |
2381 | goto error; | |
2382 | } | |
2383 | } | |
2384 | ||
2385 | /* Data is ready to be read by a viewer */ | |
6d805429 | 2386 | ret = 0; |
806e2684 DG |
2387 | |
2388 | error: | |
2389 | return ret; | |
2390 | } | |
2391 | ||
2f77fc4b DG |
2392 | /* |
2393 | * Init command subsystem. | |
2394 | */ | |
2395 | void cmd_init(void) | |
2396 | { | |
2397 | /* | |
2398 | * Set network sequence index to 1 for streams to match a relayd socket on | |
2399 | * the consumer side. | |
2400 | */ | |
2401 | uatomic_set(&relayd_net_seq_idx, 1); | |
2402 | ||
2403 | DBG("Command subsystem initialized"); | |
2404 | } |