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 | ||
9aa9f900 DG |
104 | /* |
105 | * Do we have a UST url set. If yes, this means we have both kernel and UST | |
106 | * to print. | |
107 | */ | |
9d035200 | 108 | if (*tmp_uurl != '\0') { |
2f77fc4b DG |
109 | ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]", |
110 | tmp_urls, kdata_port, tmp_uurl, udata_port); | |
111 | } else { | |
9aa9f900 DG |
112 | int dport; |
113 | if (kuri) { | |
114 | dport = kdata_port; | |
115 | } else { | |
116 | /* No kernel URI, use the UST port. */ | |
117 | dport = udata_port; | |
118 | } | |
119 | ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport); | |
2f77fc4b DG |
120 | } |
121 | ||
122 | error: | |
123 | return ret; | |
124 | } | |
125 | ||
126 | /* | |
127 | * Fill lttng_channel array of all channels. | |
128 | */ | |
129 | static void list_lttng_channels(int domain, struct ltt_session *session, | |
130 | struct lttng_channel *channels) | |
131 | { | |
132 | int i = 0; | |
133 | struct ltt_kernel_channel *kchan; | |
134 | ||
135 | DBG("Listing channels for session %s", session->name); | |
136 | ||
137 | switch (domain) { | |
138 | case LTTNG_DOMAIN_KERNEL: | |
139 | /* Kernel channels */ | |
140 | if (session->kernel_session != NULL) { | |
141 | cds_list_for_each_entry(kchan, | |
142 | &session->kernel_session->channel_list.head, list) { | |
143 | /* Copy lttng_channel struct to array */ | |
144 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
145 | channels[i].enabled = kchan->enabled; | |
146 | i++; | |
147 | } | |
148 | } | |
149 | break; | |
150 | case LTTNG_DOMAIN_UST: | |
151 | { | |
152 | struct lttng_ht_iter iter; | |
153 | struct ltt_ust_channel *uchan; | |
154 | ||
e7fe706f | 155 | rcu_read_lock(); |
2f77fc4b DG |
156 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
157 | &iter.iter, uchan, node.node) { | |
158 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); | |
159 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
160 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
161 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
162 | channels[i].attr.switch_timer_interval = | |
163 | uchan->attr.switch_timer_interval; | |
164 | channels[i].attr.read_timer_interval = | |
165 | uchan->attr.read_timer_interval; | |
166 | channels[i].enabled = uchan->enabled; | |
167 | switch (uchan->attr.output) { | |
168 | case LTTNG_UST_MMAP: | |
169 | default: | |
170 | channels[i].attr.output = LTTNG_EVENT_MMAP; | |
171 | break; | |
172 | } | |
173 | i++; | |
174 | } | |
e7fe706f | 175 | rcu_read_unlock(); |
2f77fc4b DG |
176 | break; |
177 | } | |
178 | default: | |
179 | break; | |
180 | } | |
181 | } | |
182 | ||
183 | /* | |
184 | * Create a list of ust global domain events. | |
185 | */ | |
186 | static int list_lttng_ust_global_events(char *channel_name, | |
187 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
188 | { | |
189 | int i = 0, ret = 0; | |
190 | unsigned int nb_event = 0; | |
191 | struct lttng_ht_iter iter; | |
192 | struct lttng_ht_node_str *node; | |
193 | struct ltt_ust_channel *uchan; | |
194 | struct ltt_ust_event *uevent; | |
195 | struct lttng_event *tmp; | |
196 | ||
197 | DBG("Listing UST global events for channel %s", channel_name); | |
198 | ||
199 | rcu_read_lock(); | |
200 | ||
201 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); | |
202 | node = lttng_ht_iter_get_node_str(&iter); | |
203 | if (node == NULL) { | |
f73fabfd | 204 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
205 | goto error; |
206 | } | |
207 | ||
208 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); | |
209 | ||
210 | nb_event += lttng_ht_get_count(uchan->events); | |
211 | ||
212 | if (nb_event == 0) { | |
213 | ret = nb_event; | |
214 | goto error; | |
215 | } | |
216 | ||
217 | DBG3("Listing UST global %d events", nb_event); | |
218 | ||
219 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
220 | if (tmp == NULL) { | |
f73fabfd | 221 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
222 | goto error; |
223 | } | |
224 | ||
225 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { | |
226 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); | |
227 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
228 | tmp[i].enabled = uevent->enabled; | |
229 | ||
230 | switch (uevent->attr.instrumentation) { | |
231 | case LTTNG_UST_TRACEPOINT: | |
232 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
233 | break; | |
234 | case LTTNG_UST_PROBE: | |
235 | tmp[i].type = LTTNG_EVENT_PROBE; | |
236 | break; | |
237 | case LTTNG_UST_FUNCTION: | |
238 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
239 | break; | |
240 | } | |
241 | ||
242 | tmp[i].loglevel = uevent->attr.loglevel; | |
243 | switch (uevent->attr.loglevel_type) { | |
244 | case LTTNG_UST_LOGLEVEL_ALL: | |
245 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
246 | break; | |
247 | case LTTNG_UST_LOGLEVEL_RANGE: | |
248 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; | |
249 | break; | |
250 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
251 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; | |
252 | break; | |
253 | } | |
254 | if (uevent->filter) { | |
255 | tmp[i].filter = 1; | |
256 | } | |
257 | i++; | |
258 | } | |
259 | ||
260 | ret = nb_event; | |
261 | *events = tmp; | |
262 | ||
263 | error: | |
264 | rcu_read_unlock(); | |
265 | return ret; | |
266 | } | |
267 | ||
268 | /* | |
269 | * Fill lttng_event array of all kernel events in the channel. | |
270 | */ | |
271 | static int list_lttng_kernel_events(char *channel_name, | |
272 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
273 | { | |
274 | int i = 0, ret; | |
275 | unsigned int nb_event; | |
276 | struct ltt_kernel_event *event; | |
277 | struct ltt_kernel_channel *kchan; | |
278 | ||
279 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
280 | if (kchan == NULL) { | |
f73fabfd | 281 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
282 | goto error; |
283 | } | |
284 | ||
285 | nb_event = kchan->event_count; | |
286 | ||
287 | DBG("Listing events for channel %s", kchan->channel->name); | |
288 | ||
289 | if (nb_event == 0) { | |
f73fabfd | 290 | goto end; |
2f77fc4b DG |
291 | } |
292 | ||
293 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
294 | if (*events == NULL) { | |
f73fabfd | 295 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
296 | goto error; |
297 | } | |
298 | ||
299 | /* Kernel channels */ | |
300 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
301 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
302 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
303 | (*events)[i].enabled = event->enabled; | |
304 | ||
305 | switch (event->event->instrumentation) { | |
306 | case LTTNG_KERNEL_TRACEPOINT: | |
307 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; | |
308 | break; | |
309 | case LTTNG_KERNEL_KPROBE: | |
310 | case LTTNG_KERNEL_KRETPROBE: | |
311 | (*events)[i].type = LTTNG_EVENT_PROBE; | |
312 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
313 | sizeof(struct lttng_kernel_kprobe)); | |
314 | break; | |
315 | case LTTNG_KERNEL_FUNCTION: | |
316 | (*events)[i].type = LTTNG_EVENT_FUNCTION; | |
317 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
318 | sizeof(struct lttng_kernel_function)); | |
319 | break; | |
320 | case LTTNG_KERNEL_NOOP: | |
321 | (*events)[i].type = LTTNG_EVENT_NOOP; | |
322 | break; | |
323 | case LTTNG_KERNEL_SYSCALL: | |
324 | (*events)[i].type = LTTNG_EVENT_SYSCALL; | |
325 | break; | |
326 | case LTTNG_KERNEL_ALL: | |
327 | assert(0); | |
328 | break; | |
329 | } | |
330 | i++; | |
331 | } | |
332 | ||
f73fabfd | 333 | end: |
2f77fc4b DG |
334 | return nb_event; |
335 | ||
336 | error: | |
f73fabfd DG |
337 | /* Negate the error code to differentiate the size from an error */ |
338 | return -ret; | |
2f77fc4b DG |
339 | } |
340 | ||
341 | /* | |
342 | * Add URI so the consumer output object. Set the correct path depending on the | |
343 | * domain adding the default trace directory. | |
344 | */ | |
345 | static int add_uri_to_consumer(struct consumer_output *consumer, | |
346 | struct lttng_uri *uri, int domain, const char *session_name) | |
347 | { | |
f73fabfd | 348 | int ret = LTTNG_OK; |
2f77fc4b DG |
349 | const char *default_trace_dir; |
350 | ||
351 | assert(uri); | |
352 | ||
353 | if (consumer == NULL) { | |
354 | DBG("No consumer detected. Don't add URI. Stopping."); | |
f73fabfd | 355 | ret = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
356 | goto error; |
357 | } | |
358 | ||
359 | switch (domain) { | |
360 | case LTTNG_DOMAIN_KERNEL: | |
361 | default_trace_dir = DEFAULT_KERNEL_TRACE_DIR; | |
362 | break; | |
363 | case LTTNG_DOMAIN_UST: | |
364 | default_trace_dir = DEFAULT_UST_TRACE_DIR; | |
365 | break; | |
366 | default: | |
367 | /* | |
368 | * This case is possible is we try to add the URI to the global tracing | |
369 | * session consumer object which in this case there is no subdir. | |
370 | */ | |
371 | default_trace_dir = ""; | |
372 | } | |
373 | ||
374 | switch (uri->dtype) { | |
375 | case LTTNG_DST_IPV4: | |
376 | case LTTNG_DST_IPV6: | |
377 | DBG2("Setting network URI to consumer"); | |
378 | ||
ffe60014 DG |
379 | consumer->type = CONSUMER_DST_NET; |
380 | ||
2f77fc4b DG |
381 | /* Set URI into consumer output object */ |
382 | ret = consumer_set_network_uri(consumer, uri); | |
383 | if (ret < 0) { | |
f73fabfd | 384 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
385 | goto error; |
386 | } else if (ret == 1) { | |
387 | /* | |
388 | * URI was the same in the consumer so we do not append the subdir | |
389 | * again so to not duplicate output dir. | |
390 | */ | |
391 | goto error; | |
392 | } | |
393 | ||
394 | if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) { | |
395 | ret = consumer_set_subdir(consumer, session_name); | |
396 | if (ret < 0) { | |
f73fabfd | 397 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
398 | goto error; |
399 | } | |
400 | } | |
401 | ||
402 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
403 | /* On a new subdir, reappend the default trace dir. */ | |
c30ce0b3 CB |
404 | strncat(consumer->subdir, default_trace_dir, |
405 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
406 | DBG3("Append domain trace name to subdir %s", consumer->subdir); |
407 | } | |
408 | ||
409 | break; | |
410 | case LTTNG_DST_PATH: | |
411 | DBG2("Setting trace directory path from URI to %s", uri->dst.path); | |
412 | memset(consumer->dst.trace_path, 0, | |
413 | sizeof(consumer->dst.trace_path)); | |
414 | strncpy(consumer->dst.trace_path, uri->dst.path, | |
415 | sizeof(consumer->dst.trace_path)); | |
416 | /* Append default trace dir */ | |
417 | strncat(consumer->dst.trace_path, default_trace_dir, | |
c30ce0b3 CB |
418 | sizeof(consumer->dst.trace_path) - |
419 | strlen(consumer->dst.trace_path) - 1); | |
2f77fc4b DG |
420 | /* Flag consumer as local. */ |
421 | consumer->type = CONSUMER_DST_LOCAL; | |
422 | break; | |
423 | } | |
424 | ||
425 | error: | |
426 | return ret; | |
427 | } | |
428 | ||
429 | /* | |
430 | * Init tracing by creating trace directory and sending fds kernel consumer. | |
431 | */ | |
432 | static int init_kernel_tracing(struct ltt_kernel_session *session) | |
433 | { | |
434 | int ret = 0; | |
435 | struct lttng_ht_iter iter; | |
436 | struct consumer_socket *socket; | |
437 | ||
438 | assert(session); | |
439 | ||
e7fe706f DG |
440 | rcu_read_lock(); |
441 | ||
2f77fc4b DG |
442 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { |
443 | cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter, | |
444 | socket, node.node) { | |
445 | /* Code flow error */ | |
446 | assert(socket->fd >= 0); | |
447 | ||
448 | pthread_mutex_lock(socket->lock); | |
f50f23d9 | 449 | ret = kernel_consumer_send_session(socket, session); |
2f77fc4b DG |
450 | pthread_mutex_unlock(socket->lock); |
451 | if (ret < 0) { | |
f73fabfd | 452 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
453 | goto error; |
454 | } | |
455 | } | |
456 | } | |
457 | ||
458 | error: | |
e7fe706f | 459 | rcu_read_unlock(); |
2f77fc4b DG |
460 | return ret; |
461 | } | |
462 | ||
463 | /* | |
464 | * Create a socket to the relayd using the URI. | |
465 | * | |
466 | * On success, the relayd_sock pointer is set to the created socket. | |
467 | * Else, it's stays untouched and a lttcomm error code is returned. | |
468 | */ | |
469 | static int create_connect_relayd(struct consumer_output *output, | |
470 | const char *session_name, struct lttng_uri *uri, | |
471 | struct lttcomm_sock **relayd_sock) | |
472 | { | |
473 | int ret; | |
474 | struct lttcomm_sock *sock; | |
475 | ||
476 | /* Create socket object from URI */ | |
477 | sock = lttcomm_alloc_sock_from_uri(uri); | |
478 | if (sock == NULL) { | |
f73fabfd | 479 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
480 | goto error; |
481 | } | |
482 | ||
483 | ret = lttcomm_create_sock(sock); | |
484 | if (ret < 0) { | |
f73fabfd | 485 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
486 | goto error; |
487 | } | |
488 | ||
ffe60014 DG |
489 | /* |
490 | * Connect to relayd so we can proceed with a session creation. This call | |
491 | * can possibly block for an arbitrary amount of time to set the health | |
492 | * state to be in poll execution. | |
493 | */ | |
494 | health_poll_entry(); | |
2f77fc4b | 495 | ret = relayd_connect(sock); |
ffe60014 | 496 | health_poll_exit(); |
2f77fc4b DG |
497 | if (ret < 0) { |
498 | ERR("Unable to reach lttng-relayd"); | |
f73fabfd | 499 | ret = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
500 | goto free_sock; |
501 | } | |
502 | ||
503 | /* Create socket for control stream. */ | |
504 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
505 | DBG3("Creating relayd stream socket from URI"); | |
506 | ||
507 | /* Check relayd version */ | |
508 | ret = relayd_version_check(sock, RELAYD_VERSION_COMM_MAJOR, | |
509 | RELAYD_VERSION_COMM_MINOR); | |
510 | if (ret < 0) { | |
f73fabfd | 511 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; |
2f77fc4b DG |
512 | goto close_sock; |
513 | } | |
514 | } else if (uri->stype == LTTNG_STREAM_DATA) { | |
515 | DBG3("Creating relayd data socket from URI"); | |
516 | } else { | |
517 | /* Command is not valid */ | |
518 | ERR("Relayd invalid stream type: %d", uri->stype); | |
f73fabfd | 519 | ret = LTTNG_ERR_INVALID; |
2f77fc4b DG |
520 | goto close_sock; |
521 | } | |
522 | ||
523 | *relayd_sock = sock; | |
524 | ||
f73fabfd | 525 | return LTTNG_OK; |
2f77fc4b DG |
526 | |
527 | close_sock: | |
528 | if (sock) { | |
529 | (void) relayd_close(sock); | |
530 | } | |
531 | free_sock: | |
532 | if (sock) { | |
533 | lttcomm_destroy_sock(sock); | |
534 | } | |
535 | error: | |
536 | return ret; | |
537 | } | |
538 | ||
539 | /* | |
540 | * Connect to the relayd using URI and send the socket to the right consumer. | |
541 | */ | |
542 | static int send_consumer_relayd_socket(int domain, struct ltt_session *session, | |
543 | struct lttng_uri *relayd_uri, struct consumer_output *consumer, | |
f50f23d9 | 544 | struct consumer_socket *consumer_sock) |
2f77fc4b DG |
545 | { |
546 | int ret; | |
547 | struct lttcomm_sock *sock = NULL; | |
548 | ||
ffe60014 DG |
549 | /* Connect to relayd and make version check if uri is the control. */ |
550 | ret = create_connect_relayd(consumer, session->name, relayd_uri, &sock); | |
551 | if (ret != LTTNG_OK) { | |
552 | goto close_sock; | |
553 | } | |
554 | ||
555 | /* If the control socket is connected, network session is ready */ | |
556 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
557 | session->net_handle = 1; | |
558 | } | |
559 | ||
2f77fc4b DG |
560 | /* Set the network sequence index if not set. */ |
561 | if (consumer->net_seq_index == -1) { | |
562 | /* | |
563 | * Increment net_seq_idx because we are about to transfer the | |
564 | * new relayd socket to the consumer. | |
565 | */ | |
566 | uatomic_inc(&relayd_net_seq_idx); | |
567 | /* Assign unique key so the consumer can match streams */ | |
568 | uatomic_set(&consumer->net_seq_index, | |
569 | uatomic_read(&relayd_net_seq_idx)); | |
570 | } | |
571 | ||
2f77fc4b | 572 | /* Send relayd socket to consumer. */ |
f50f23d9 | 573 | ret = consumer_send_relayd_socket(consumer_sock, sock, |
46e6455f | 574 | consumer, relayd_uri->stype, session->id); |
2f77fc4b | 575 | if (ret < 0) { |
f73fabfd | 576 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
577 | goto close_sock; |
578 | } | |
579 | ||
c890b720 DG |
580 | /* Flag that the corresponding socket was sent. */ |
581 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
ffe60014 | 582 | consumer_sock->control_sock_sent = 1; |
c890b720 | 583 | } else if (relayd_uri->stype == LTTNG_STREAM_DATA) { |
ffe60014 | 584 | consumer_sock->data_sock_sent = 1; |
c890b720 DG |
585 | } |
586 | ||
f73fabfd | 587 | ret = LTTNG_OK; |
2f77fc4b DG |
588 | |
589 | /* | |
590 | * Close socket which was dup on the consumer side. The session daemon does | |
591 | * NOT keep track of the relayd socket(s) once transfer to the consumer. | |
592 | */ | |
593 | ||
594 | close_sock: | |
595 | if (sock) { | |
596 | (void) relayd_close(sock); | |
597 | lttcomm_destroy_sock(sock); | |
598 | } | |
599 | ||
ffe60014 DG |
600 | if (ret != LTTNG_OK) { |
601 | /* | |
602 | * On error, nullify the consumer sequence index so streams are not | |
603 | * associated with it once sent to the consumer. | |
604 | */ | |
605 | uatomic_set(&consumer->net_seq_index, -1); | |
606 | } | |
607 | ||
2f77fc4b DG |
608 | return ret; |
609 | } | |
610 | ||
611 | /* | |
612 | * Send both relayd sockets to a specific consumer and domain. This is a | |
613 | * helper function to facilitate sending the information to the consumer for a | |
614 | * session. | |
615 | */ | |
616 | static int send_consumer_relayd_sockets(int domain, | |
f50f23d9 DG |
617 | struct ltt_session *session, struct consumer_output *consumer, |
618 | struct consumer_socket *sock) | |
2f77fc4b | 619 | { |
dda67f6c | 620 | int ret = LTTNG_OK; |
2f77fc4b DG |
621 | |
622 | assert(session); | |
623 | assert(consumer); | |
624 | ||
2f77fc4b | 625 | /* Sending control relayd socket. */ |
ffe60014 | 626 | if (!sock->control_sock_sent) { |
c890b720 | 627 | ret = send_consumer_relayd_socket(domain, session, |
f50f23d9 | 628 | &consumer->dst.net.control, consumer, sock); |
c890b720 DG |
629 | if (ret != LTTNG_OK) { |
630 | goto error; | |
631 | } | |
2f77fc4b DG |
632 | } |
633 | ||
634 | /* Sending data relayd socket. */ | |
ffe60014 | 635 | if (!sock->data_sock_sent) { |
c890b720 | 636 | ret = send_consumer_relayd_socket(domain, session, |
f50f23d9 | 637 | &consumer->dst.net.data, consumer, sock); |
c890b720 DG |
638 | if (ret != LTTNG_OK) { |
639 | goto error; | |
640 | } | |
2f77fc4b DG |
641 | } |
642 | ||
2f77fc4b DG |
643 | error: |
644 | return ret; | |
645 | } | |
646 | ||
647 | /* | |
648 | * Setup relayd connections for a tracing session. First creates the socket to | |
649 | * the relayd and send them to the right domain consumer. Consumer type MUST be | |
650 | * network. | |
651 | */ | |
ffe60014 | 652 | int cmd_setup_relayd(struct ltt_session *session) |
2f77fc4b | 653 | { |
f73fabfd | 654 | int ret = LTTNG_OK; |
2f77fc4b DG |
655 | struct ltt_ust_session *usess; |
656 | struct ltt_kernel_session *ksess; | |
657 | struct consumer_socket *socket; | |
658 | struct lttng_ht_iter iter; | |
659 | ||
660 | assert(session); | |
661 | ||
662 | usess = session->ust_session; | |
663 | ksess = session->kernel_session; | |
664 | ||
665 | DBG2("Setting relayd for session %s", session->name); | |
666 | ||
e7fe706f DG |
667 | rcu_read_lock(); |
668 | ||
2f77fc4b DG |
669 | if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET |
670 | && usess->consumer->enabled) { | |
671 | /* For each consumer socket, send relayd sockets */ | |
672 | cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, | |
673 | socket, node.node) { | |
674 | /* Code flow error */ | |
675 | assert(socket->fd >= 0); | |
676 | ||
677 | pthread_mutex_lock(socket->lock); | |
dda67f6c | 678 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session, |
f50f23d9 | 679 | usess->consumer, socket); |
2f77fc4b | 680 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 681 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
682 | goto error; |
683 | } | |
684 | } | |
685 | } | |
686 | ||
687 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET | |
688 | && ksess->consumer->enabled) { | |
689 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
690 | socket, node.node) { | |
691 | /* Code flow error */ | |
692 | assert(socket->fd >= 0); | |
693 | ||
694 | pthread_mutex_lock(socket->lock); | |
dda67f6c | 695 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session, |
f50f23d9 | 696 | ksess->consumer, socket); |
2f77fc4b | 697 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 698 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
699 | goto error; |
700 | } | |
701 | } | |
702 | } | |
703 | ||
704 | error: | |
e7fe706f | 705 | rcu_read_unlock(); |
2f77fc4b DG |
706 | return ret; |
707 | } | |
708 | ||
9b6c7ec5 DG |
709 | /* |
710 | * Start a kernel session by opening all necessary streams. | |
711 | */ | |
712 | static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe) | |
713 | { | |
714 | int ret; | |
715 | struct ltt_kernel_channel *kchan; | |
716 | ||
717 | /* Open kernel metadata */ | |
718 | if (ksess->metadata == NULL) { | |
719 | ret = kernel_open_metadata(ksess); | |
720 | if (ret < 0) { | |
721 | ret = LTTNG_ERR_KERN_META_FAIL; | |
722 | goto error; | |
723 | } | |
724 | } | |
725 | ||
726 | /* Open kernel metadata stream */ | |
727 | if (ksess->metadata_stream_fd < 0) { | |
728 | ret = kernel_open_metadata_stream(ksess); | |
729 | if (ret < 0) { | |
730 | ERR("Kernel create metadata stream failed"); | |
731 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
732 | goto error; | |
733 | } | |
734 | } | |
735 | ||
736 | /* For each channel */ | |
737 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
738 | if (kchan->stream_count == 0) { | |
739 | ret = kernel_open_channel_stream(kchan); | |
740 | if (ret < 0) { | |
741 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
742 | goto error; | |
743 | } | |
744 | /* Update the stream global counter */ | |
745 | ksess->stream_count_global += ret; | |
746 | } | |
747 | } | |
748 | ||
749 | /* Setup kernel consumer socket and send fds to it */ | |
750 | ret = init_kernel_tracing(ksess); | |
751 | if (ret < 0) { | |
752 | ret = LTTNG_ERR_KERN_START_FAIL; | |
753 | goto error; | |
754 | } | |
755 | ||
756 | /* This start the kernel tracing */ | |
757 | ret = kernel_start_session(ksess); | |
758 | if (ret < 0) { | |
759 | ret = LTTNG_ERR_KERN_START_FAIL; | |
760 | goto error; | |
761 | } | |
762 | ||
763 | /* Quiescent wait after starting trace */ | |
784303b0 | 764 | kernel_wait_quiescent(kernel_tracer_fd); |
9b6c7ec5 DG |
765 | |
766 | ksess->started = 1; | |
767 | ||
768 | ret = LTTNG_OK; | |
769 | ||
770 | error: | |
771 | return ret; | |
772 | } | |
773 | ||
2f77fc4b DG |
774 | /* |
775 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. | |
776 | */ | |
777 | int cmd_disable_channel(struct ltt_session *session, int domain, | |
778 | char *channel_name) | |
779 | { | |
780 | int ret; | |
781 | struct ltt_ust_session *usess; | |
782 | ||
783 | usess = session->ust_session; | |
784 | ||
2223c96f DG |
785 | rcu_read_lock(); |
786 | ||
2f77fc4b DG |
787 | switch (domain) { |
788 | case LTTNG_DOMAIN_KERNEL: | |
789 | { | |
790 | ret = channel_kernel_disable(session->kernel_session, | |
791 | channel_name); | |
f73fabfd | 792 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
793 | goto error; |
794 | } | |
795 | ||
796 | kernel_wait_quiescent(kernel_tracer_fd); | |
797 | break; | |
798 | } | |
799 | case LTTNG_DOMAIN_UST: | |
800 | { | |
801 | struct ltt_ust_channel *uchan; | |
802 | struct lttng_ht *chan_ht; | |
803 | ||
804 | chan_ht = usess->domain_global.channels; | |
805 | ||
806 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
807 | if (uchan == NULL) { | |
f73fabfd | 808 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
809 | goto error; |
810 | } | |
811 | ||
812 | ret = channel_ust_disable(usess, domain, uchan); | |
f73fabfd | 813 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
814 | goto error; |
815 | } | |
816 | break; | |
817 | } | |
818 | #if 0 | |
819 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
820 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
821 | case LTTNG_DOMAIN_UST_PID: | |
822 | #endif | |
823 | default: | |
f73fabfd | 824 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
825 | goto error; |
826 | } | |
827 | ||
f73fabfd | 828 | ret = LTTNG_OK; |
2f77fc4b DG |
829 | |
830 | error: | |
2223c96f | 831 | rcu_read_unlock(); |
2f77fc4b DG |
832 | return ret; |
833 | } | |
834 | ||
835 | /* | |
836 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
837 | * | |
838 | * The wpipe arguments is used as a notifier for the kernel thread. | |
839 | */ | |
840 | int cmd_enable_channel(struct ltt_session *session, | |
841 | int domain, struct lttng_channel *attr, int wpipe) | |
842 | { | |
843 | int ret; | |
844 | struct ltt_ust_session *usess = session->ust_session; | |
845 | struct lttng_ht *chan_ht; | |
846 | ||
847 | assert(session); | |
848 | assert(attr); | |
849 | ||
850 | DBG("Enabling channel %s for session %s", attr->name, session->name); | |
851 | ||
2223c96f DG |
852 | rcu_read_lock(); |
853 | ||
2f77fc4b DG |
854 | switch (domain) { |
855 | case LTTNG_DOMAIN_KERNEL: | |
856 | { | |
857 | struct ltt_kernel_channel *kchan; | |
858 | ||
2f77fc4b DG |
859 | kchan = trace_kernel_get_channel_by_name(attr->name, |
860 | session->kernel_session); | |
861 | if (kchan == NULL) { | |
862 | ret = channel_kernel_create(session->kernel_session, attr, wpipe); | |
863 | } else { | |
864 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
865 | } | |
866 | ||
f73fabfd | 867 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
868 | goto error; |
869 | } | |
870 | ||
784303b0 | 871 | kernel_wait_quiescent(kernel_tracer_fd); |
9b6c7ec5 DG |
872 | |
873 | /* | |
874 | * If the session was previously started, start as well this newly | |
875 | * created kernel session so the events/channels enabled *after* the | |
876 | * start actually work. | |
877 | */ | |
878 | if (session->started && !session->kernel_session->started) { | |
879 | ret = start_kernel_session(session->kernel_session, wpipe); | |
880 | if (ret != LTTNG_OK) { | |
881 | goto error; | |
882 | } | |
883 | } | |
2f77fc4b DG |
884 | break; |
885 | } | |
886 | case LTTNG_DOMAIN_UST: | |
887 | { | |
888 | struct ltt_ust_channel *uchan; | |
889 | ||
890 | chan_ht = usess->domain_global.channels; | |
891 | ||
892 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); | |
893 | if (uchan == NULL) { | |
894 | ret = channel_ust_create(usess, domain, attr); | |
895 | } else { | |
896 | ret = channel_ust_enable(usess, domain, uchan); | |
897 | } | |
9b6c7ec5 DG |
898 | |
899 | /* Start the UST session if the session was already started. */ | |
900 | if (session->started && !usess->start_trace) { | |
901 | ret = ust_app_start_trace_all(usess); | |
902 | if (ret < 0) { | |
903 | ret = LTTNG_ERR_UST_START_FAIL; | |
904 | goto error; | |
905 | } | |
906 | ret = LTTNG_OK; | |
907 | usess->start_trace = 1; | |
908 | } | |
2f77fc4b DG |
909 | break; |
910 | } | |
911 | #if 0 | |
912 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
913 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
914 | case LTTNG_DOMAIN_UST_PID: | |
915 | #endif | |
916 | default: | |
f73fabfd | 917 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
918 | goto error; |
919 | } | |
920 | ||
921 | error: | |
2223c96f | 922 | rcu_read_unlock(); |
2f77fc4b DG |
923 | return ret; |
924 | } | |
925 | ||
926 | ||
927 | /* | |
928 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
929 | */ | |
930 | int cmd_disable_event(struct ltt_session *session, int domain, | |
931 | char *channel_name, char *event_name) | |
932 | { | |
933 | int ret; | |
934 | ||
2223c96f DG |
935 | rcu_read_lock(); |
936 | ||
2f77fc4b DG |
937 | switch (domain) { |
938 | case LTTNG_DOMAIN_KERNEL: | |
939 | { | |
940 | struct ltt_kernel_channel *kchan; | |
941 | struct ltt_kernel_session *ksess; | |
942 | ||
943 | ksess = session->kernel_session; | |
944 | ||
945 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
946 | if (kchan == NULL) { | |
f73fabfd | 947 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
948 | goto error; |
949 | } | |
950 | ||
d3a56674 | 951 | ret = event_kernel_disable_tracepoint(kchan, event_name); |
f73fabfd | 952 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
953 | goto error; |
954 | } | |
955 | ||
956 | kernel_wait_quiescent(kernel_tracer_fd); | |
957 | break; | |
958 | } | |
959 | case LTTNG_DOMAIN_UST: | |
960 | { | |
961 | struct ltt_ust_channel *uchan; | |
962 | struct ltt_ust_session *usess; | |
963 | ||
964 | usess = session->ust_session; | |
965 | ||
966 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
967 | channel_name); | |
968 | if (uchan == NULL) { | |
f73fabfd | 969 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
970 | goto error; |
971 | } | |
972 | ||
973 | ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name); | |
f73fabfd | 974 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
975 | goto error; |
976 | } | |
977 | ||
978 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
979 | channel_name); | |
980 | break; | |
981 | } | |
982 | #if 0 | |
983 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
984 | case LTTNG_DOMAIN_UST_PID: | |
985 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
986 | #endif | |
987 | default: | |
f73fabfd | 988 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
989 | goto error; |
990 | } | |
991 | ||
f73fabfd | 992 | ret = LTTNG_OK; |
2f77fc4b DG |
993 | |
994 | error: | |
2223c96f | 995 | rcu_read_unlock(); |
2f77fc4b DG |
996 | return ret; |
997 | } | |
998 | ||
999 | /* | |
1000 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
1001 | */ | |
1002 | int cmd_disable_event_all(struct ltt_session *session, int domain, | |
1003 | char *channel_name) | |
1004 | { | |
1005 | int ret; | |
1006 | ||
2223c96f DG |
1007 | rcu_read_lock(); |
1008 | ||
2f77fc4b DG |
1009 | switch (domain) { |
1010 | case LTTNG_DOMAIN_KERNEL: | |
1011 | { | |
1012 | struct ltt_kernel_session *ksess; | |
1013 | struct ltt_kernel_channel *kchan; | |
1014 | ||
1015 | ksess = session->kernel_session; | |
1016 | ||
1017 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
1018 | if (kchan == NULL) { | |
f73fabfd | 1019 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
1020 | goto error; |
1021 | } | |
1022 | ||
d3a56674 | 1023 | ret = event_kernel_disable_all(kchan); |
f73fabfd | 1024 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1025 | goto error; |
1026 | } | |
1027 | ||
1028 | kernel_wait_quiescent(kernel_tracer_fd); | |
1029 | break; | |
1030 | } | |
1031 | case LTTNG_DOMAIN_UST: | |
1032 | { | |
1033 | struct ltt_ust_session *usess; | |
1034 | struct ltt_ust_channel *uchan; | |
1035 | ||
1036 | usess = session->ust_session; | |
1037 | ||
1038 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
1039 | channel_name); | |
1040 | if (uchan == NULL) { | |
f73fabfd | 1041 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
1042 | goto error; |
1043 | } | |
1044 | ||
1045 | ret = event_ust_disable_all_tracepoints(usess, domain, uchan); | |
1046 | if (ret != 0) { | |
1047 | goto error; | |
1048 | } | |
1049 | ||
1050 | DBG3("Disable all UST events in channel %s completed", channel_name); | |
1051 | ||
1052 | break; | |
1053 | } | |
1054 | #if 0 | |
1055 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
1056 | case LTTNG_DOMAIN_UST_PID: | |
1057 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
1058 | #endif | |
1059 | default: | |
f73fabfd | 1060 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1061 | goto error; |
1062 | } | |
1063 | ||
f73fabfd | 1064 | ret = LTTNG_OK; |
2f77fc4b DG |
1065 | |
1066 | error: | |
2223c96f | 1067 | rcu_read_unlock(); |
2f77fc4b DG |
1068 | return ret; |
1069 | } | |
1070 | ||
1071 | /* | |
1072 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1073 | */ | |
1074 | int cmd_add_context(struct ltt_session *session, int domain, | |
601d5acf | 1075 | char *channel_name, struct lttng_event_context *ctx, int kwpipe) |
2f77fc4b DG |
1076 | { |
1077 | int ret; | |
1078 | ||
1079 | switch (domain) { | |
1080 | case LTTNG_DOMAIN_KERNEL: | |
979e618e DG |
1081 | assert(session->kernel_session); |
1082 | ||
1083 | if (session->kernel_session->channel_count == 0) { | |
1084 | /* Create default channel */ | |
1085 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); | |
1086 | if (ret != LTTNG_OK) { | |
1087 | goto error; | |
1088 | } | |
1089 | } | |
1090 | ||
2f77fc4b | 1091 | /* Add kernel context to kernel tracer */ |
601d5acf | 1092 | ret = context_kernel_add(session->kernel_session, ctx, channel_name); |
f73fabfd | 1093 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1094 | goto error; |
1095 | } | |
1096 | break; | |
1097 | case LTTNG_DOMAIN_UST: | |
1098 | { | |
1099 | struct ltt_ust_session *usess = session->ust_session; | |
2f77fc4b DG |
1100 | assert(usess); |
1101 | ||
979e618e DG |
1102 | unsigned int chan_count = |
1103 | lttng_ht_get_count(usess->domain_global.channels); | |
1104 | if (chan_count == 0) { | |
1105 | struct lttng_channel *attr; | |
1106 | /* Create default channel */ | |
1107 | attr = channel_new_default_attr(domain); | |
1108 | if (attr == NULL) { | |
1109 | ret = LTTNG_ERR_FATAL; | |
1110 | goto error; | |
1111 | } | |
1112 | ||
1113 | ret = channel_ust_create(usess, domain, attr); | |
1114 | if (ret != LTTNG_OK) { | |
1115 | free(attr); | |
1116 | goto error; | |
1117 | } | |
1118 | free(attr); | |
1119 | } | |
1120 | ||
601d5acf | 1121 | ret = context_ust_add(usess, domain, ctx, channel_name); |
f73fabfd | 1122 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1123 | goto error; |
1124 | } | |
1125 | break; | |
1126 | } | |
1127 | #if 0 | |
1128 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
1129 | case LTTNG_DOMAIN_UST_PID: | |
1130 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
1131 | #endif | |
1132 | default: | |
f73fabfd | 1133 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1134 | goto error; |
1135 | } | |
1136 | ||
f73fabfd | 1137 | ret = LTTNG_OK; |
2f77fc4b DG |
1138 | |
1139 | error: | |
1140 | return ret; | |
1141 | } | |
1142 | ||
2f77fc4b DG |
1143 | /* |
1144 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
1145 | */ | |
1146 | int cmd_enable_event(struct ltt_session *session, int domain, | |
025faf73 DG |
1147 | char *channel_name, struct lttng_event *event, |
1148 | struct lttng_filter_bytecode *filter, int wpipe) | |
2f77fc4b | 1149 | { |
e5f5db7f | 1150 | int ret, channel_created = 0; |
2f77fc4b DG |
1151 | struct lttng_channel *attr; |
1152 | ||
1153 | assert(session); | |
1154 | assert(event); | |
1155 | assert(channel_name); | |
1156 | ||
2223c96f DG |
1157 | rcu_read_lock(); |
1158 | ||
2f77fc4b DG |
1159 | switch (domain) { |
1160 | case LTTNG_DOMAIN_KERNEL: | |
1161 | { | |
1162 | struct ltt_kernel_channel *kchan; | |
1163 | ||
1164 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1165 | session->kernel_session); | |
1166 | if (kchan == NULL) { | |
1167 | attr = channel_new_default_attr(domain); | |
1168 | if (attr == NULL) { | |
f73fabfd | 1169 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1170 | goto error; |
1171 | } | |
1172 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1173 | ||
1174 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1175 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1176 | free(attr); |
1177 | goto error; | |
1178 | } | |
1179 | free(attr); | |
e5f5db7f DG |
1180 | |
1181 | channel_created = 1; | |
2f77fc4b DG |
1182 | } |
1183 | ||
1184 | /* Get the newly created kernel channel pointer */ | |
1185 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1186 | session->kernel_session); | |
1187 | if (kchan == NULL) { | |
1188 | /* This sould not happen... */ | |
f73fabfd | 1189 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1190 | goto error; |
1191 | } | |
1192 | ||
d3a56674 | 1193 | ret = event_kernel_enable_tracepoint(kchan, event); |
f73fabfd | 1194 | if (ret != LTTNG_OK) { |
e5f5db7f DG |
1195 | if (channel_created) { |
1196 | /* Let's not leak a useless channel. */ | |
1197 | kernel_destroy_channel(kchan); | |
1198 | } | |
2f77fc4b DG |
1199 | goto error; |
1200 | } | |
1201 | ||
1202 | kernel_wait_quiescent(kernel_tracer_fd); | |
1203 | break; | |
1204 | } | |
1205 | case LTTNG_DOMAIN_UST: | |
1206 | { | |
1207 | struct ltt_ust_channel *uchan; | |
1208 | struct ltt_ust_session *usess = session->ust_session; | |
1209 | ||
1210 | assert(usess); | |
1211 | ||
1212 | /* Get channel from global UST domain */ | |
1213 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
1214 | channel_name); | |
1215 | if (uchan == NULL) { | |
1216 | /* Create default channel */ | |
1217 | attr = channel_new_default_attr(domain); | |
1218 | if (attr == NULL) { | |
f73fabfd | 1219 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1220 | goto error; |
1221 | } | |
1222 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1223 | ||
1224 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1225 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1226 | free(attr); |
1227 | goto error; | |
1228 | } | |
1229 | free(attr); | |
1230 | ||
1231 | /* Get the newly created channel reference back */ | |
1232 | uchan = trace_ust_find_channel_by_name( | |
1233 | usess->domain_global.channels, channel_name); | |
1234 | assert(uchan); | |
1235 | } | |
1236 | ||
1237 | /* At this point, the session and channel exist on the tracer */ | |
025faf73 | 1238 | ret = event_ust_enable_tracepoint(usess, domain, uchan, event, filter); |
f73fabfd | 1239 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1240 | goto error; |
1241 | } | |
1242 | break; | |
1243 | } | |
1244 | #if 0 | |
1245 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
1246 | case LTTNG_DOMAIN_UST_PID: | |
1247 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
1248 | #endif | |
1249 | default: | |
f73fabfd | 1250 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1251 | goto error; |
1252 | } | |
1253 | ||
f73fabfd | 1254 | ret = LTTNG_OK; |
2f77fc4b DG |
1255 | |
1256 | error: | |
2223c96f | 1257 | rcu_read_unlock(); |
2f77fc4b DG |
1258 | return ret; |
1259 | } | |
1260 | ||
1261 | /* | |
1262 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
1263 | */ | |
1264 | int cmd_enable_event_all(struct ltt_session *session, int domain, | |
025faf73 DG |
1265 | char *channel_name, int event_type, |
1266 | struct lttng_filter_bytecode *filter, int wpipe) | |
2f77fc4b DG |
1267 | { |
1268 | int ret; | |
1269 | struct lttng_channel *attr; | |
1270 | ||
1271 | assert(session); | |
1272 | assert(channel_name); | |
1273 | ||
2223c96f DG |
1274 | rcu_read_lock(); |
1275 | ||
2f77fc4b DG |
1276 | switch (domain) { |
1277 | case LTTNG_DOMAIN_KERNEL: | |
1278 | { | |
1279 | struct ltt_kernel_channel *kchan; | |
1280 | ||
1281 | assert(session->kernel_session); | |
1282 | ||
1283 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1284 | session->kernel_session); | |
1285 | if (kchan == NULL) { | |
1286 | /* Create default channel */ | |
1287 | attr = channel_new_default_attr(domain); | |
1288 | if (attr == NULL) { | |
f73fabfd | 1289 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1290 | goto error; |
1291 | } | |
1292 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1293 | ||
1294 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1295 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1296 | free(attr); |
1297 | goto error; | |
1298 | } | |
1299 | free(attr); | |
1300 | ||
1301 | /* Get the newly created kernel channel pointer */ | |
1302 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1303 | session->kernel_session); | |
1304 | assert(kchan); | |
1305 | } | |
1306 | ||
1307 | switch (event_type) { | |
1308 | case LTTNG_EVENT_SYSCALL: | |
d3a56674 | 1309 | ret = event_kernel_enable_all_syscalls(kchan, kernel_tracer_fd); |
2f77fc4b DG |
1310 | break; |
1311 | case LTTNG_EVENT_TRACEPOINT: | |
1312 | /* | |
1313 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and | |
1314 | * events already registered to the channel. | |
1315 | */ | |
d3a56674 | 1316 | ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd); |
2f77fc4b DG |
1317 | break; |
1318 | case LTTNG_EVENT_ALL: | |
1319 | /* Enable syscalls and tracepoints */ | |
d3a56674 | 1320 | ret = event_kernel_enable_all(kchan, kernel_tracer_fd); |
2f77fc4b DG |
1321 | break; |
1322 | default: | |
f73fabfd | 1323 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
2f77fc4b DG |
1324 | goto error; |
1325 | } | |
1326 | ||
1327 | /* Manage return value */ | |
f73fabfd | 1328 | if (ret != LTTNG_OK) { |
e5f5db7f DG |
1329 | /* |
1330 | * On error, cmd_enable_channel call will take care of destroying | |
1331 | * the created channel if it was needed. | |
1332 | */ | |
2f77fc4b DG |
1333 | goto error; |
1334 | } | |
1335 | ||
1336 | kernel_wait_quiescent(kernel_tracer_fd); | |
1337 | break; | |
1338 | } | |
1339 | case LTTNG_DOMAIN_UST: | |
1340 | { | |
1341 | struct ltt_ust_channel *uchan; | |
1342 | struct ltt_ust_session *usess = session->ust_session; | |
1343 | ||
1344 | assert(usess); | |
1345 | ||
1346 | /* Get channel from global UST domain */ | |
1347 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
1348 | channel_name); | |
1349 | if (uchan == NULL) { | |
1350 | /* Create default channel */ | |
1351 | attr = channel_new_default_attr(domain); | |
1352 | if (attr == NULL) { | |
f73fabfd | 1353 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1354 | goto error; |
1355 | } | |
1356 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1357 | ||
1358 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1359 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1360 | free(attr); |
1361 | goto error; | |
1362 | } | |
1363 | free(attr); | |
1364 | ||
1365 | /* Get the newly created channel reference back */ | |
1366 | uchan = trace_ust_find_channel_by_name( | |
1367 | usess->domain_global.channels, channel_name); | |
1368 | assert(uchan); | |
1369 | } | |
1370 | ||
1371 | /* At this point, the session and channel exist on the tracer */ | |
1372 | ||
1373 | switch (event_type) { | |
1374 | case LTTNG_EVENT_ALL: | |
1375 | case LTTNG_EVENT_TRACEPOINT: | |
025faf73 DG |
1376 | ret = event_ust_enable_all_tracepoints(usess, domain, uchan, |
1377 | filter); | |
f73fabfd | 1378 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1379 | goto error; |
1380 | } | |
1381 | break; | |
1382 | default: | |
f73fabfd | 1383 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
2f77fc4b DG |
1384 | goto error; |
1385 | } | |
1386 | ||
1387 | /* Manage return value */ | |
f73fabfd | 1388 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1389 | goto error; |
1390 | } | |
1391 | ||
1392 | break; | |
1393 | } | |
1394 | #if 0 | |
1395 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
1396 | case LTTNG_DOMAIN_UST_PID: | |
1397 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
1398 | #endif | |
1399 | default: | |
f73fabfd | 1400 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1401 | goto error; |
1402 | } | |
1403 | ||
f73fabfd | 1404 | ret = LTTNG_OK; |
2f77fc4b DG |
1405 | |
1406 | error: | |
2223c96f | 1407 | rcu_read_unlock(); |
2f77fc4b DG |
1408 | return ret; |
1409 | } | |
1410 | ||
1411 | ||
1412 | /* | |
1413 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
1414 | */ | |
1415 | ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
1416 | { | |
1417 | int ret; | |
1418 | ssize_t nb_events = 0; | |
1419 | ||
1420 | switch (domain) { | |
1421 | case LTTNG_DOMAIN_KERNEL: | |
1422 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
1423 | if (nb_events < 0) { | |
f73fabfd | 1424 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
2f77fc4b DG |
1425 | goto error; |
1426 | } | |
1427 | break; | |
1428 | case LTTNG_DOMAIN_UST: | |
1429 | nb_events = ust_app_list_events(events); | |
1430 | if (nb_events < 0) { | |
f73fabfd | 1431 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
1432 | goto error; |
1433 | } | |
1434 | break; | |
1435 | default: | |
f73fabfd | 1436 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1437 | goto error; |
1438 | } | |
1439 | ||
1440 | return nb_events; | |
1441 | ||
1442 | error: | |
1443 | /* Return negative value to differentiate return code */ | |
1444 | return -ret; | |
1445 | } | |
1446 | ||
1447 | /* | |
1448 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
1449 | */ | |
1450 | ssize_t cmd_list_tracepoint_fields(int domain, | |
1451 | struct lttng_event_field **fields) | |
1452 | { | |
1453 | int ret; | |
1454 | ssize_t nb_fields = 0; | |
1455 | ||
1456 | switch (domain) { | |
1457 | case LTTNG_DOMAIN_UST: | |
1458 | nb_fields = ust_app_list_event_fields(fields); | |
1459 | if (nb_fields < 0) { | |
f73fabfd | 1460 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
1461 | goto error; |
1462 | } | |
1463 | break; | |
1464 | case LTTNG_DOMAIN_KERNEL: | |
1465 | default: /* fall-through */ | |
f73fabfd | 1466 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1467 | goto error; |
1468 | } | |
1469 | ||
1470 | return nb_fields; | |
1471 | ||
1472 | error: | |
1473 | /* Return negative value to differentiate return code */ | |
1474 | return -ret; | |
1475 | } | |
1476 | ||
1477 | /* | |
1478 | * Command LTTNG_START_TRACE processed by the client thread. | |
1479 | */ | |
1480 | int cmd_start_trace(struct ltt_session *session) | |
1481 | { | |
1482 | int ret; | |
1483 | struct ltt_kernel_session *ksession; | |
1484 | struct ltt_ust_session *usess; | |
2f77fc4b DG |
1485 | |
1486 | assert(session); | |
1487 | ||
1488 | /* Ease our life a bit ;) */ | |
1489 | ksession = session->kernel_session; | |
1490 | usess = session->ust_session; | |
1491 | ||
1492 | if (session->enabled) { | |
1493 | /* Already started. */ | |
f73fabfd | 1494 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
1495 | goto error; |
1496 | } | |
1497 | ||
1498 | session->enabled = 1; | |
1499 | ||
2f77fc4b DG |
1500 | /* Kernel tracing */ |
1501 | if (ksession != NULL) { | |
9b6c7ec5 DG |
1502 | ret = start_kernel_session(ksession, kernel_tracer_fd); |
1503 | if (ret != LTTNG_OK) { | |
2f77fc4b DG |
1504 | goto error; |
1505 | } | |
2f77fc4b DG |
1506 | } |
1507 | ||
1508 | /* Flag session that trace should start automatically */ | |
1509 | if (usess) { | |
1510 | usess->start_trace = 1; | |
1511 | ||
1512 | ret = ust_app_start_trace_all(usess); | |
1513 | if (ret < 0) { | |
f73fabfd | 1514 | ret = LTTNG_ERR_UST_START_FAIL; |
2f77fc4b DG |
1515 | goto error; |
1516 | } | |
1517 | } | |
1518 | ||
9b6c7ec5 DG |
1519 | session->started = 1; |
1520 | ||
f73fabfd | 1521 | ret = LTTNG_OK; |
2f77fc4b DG |
1522 | |
1523 | error: | |
1524 | return ret; | |
1525 | } | |
1526 | ||
1527 | /* | |
1528 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
1529 | */ | |
1530 | int cmd_stop_trace(struct ltt_session *session) | |
1531 | { | |
1532 | int ret; | |
1533 | struct ltt_kernel_channel *kchan; | |
1534 | struct ltt_kernel_session *ksession; | |
1535 | struct ltt_ust_session *usess; | |
1536 | ||
1537 | assert(session); | |
1538 | ||
1539 | /* Short cut */ | |
1540 | ksession = session->kernel_session; | |
1541 | usess = session->ust_session; | |
1542 | ||
1543 | if (!session->enabled) { | |
f73fabfd | 1544 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
2f77fc4b DG |
1545 | goto error; |
1546 | } | |
1547 | ||
1548 | session->enabled = 0; | |
1549 | ||
1550 | /* Kernel tracer */ | |
1551 | if (ksession) { | |
1552 | DBG("Stop kernel tracing"); | |
1553 | ||
1554 | /* Flush metadata if exist */ | |
1555 | if (ksession->metadata_stream_fd >= 0) { | |
1556 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
1557 | if (ret < 0) { | |
1558 | ERR("Kernel metadata flush failed"); | |
1559 | } | |
1560 | } | |
1561 | ||
1562 | /* Flush all buffers before stopping */ | |
1563 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
1564 | ret = kernel_flush_buffer(kchan); | |
1565 | if (ret < 0) { | |
1566 | ERR("Kernel flush buffer error"); | |
1567 | } | |
1568 | } | |
1569 | ||
1570 | ret = kernel_stop_session(ksession); | |
1571 | if (ret < 0) { | |
f73fabfd | 1572 | ret = LTTNG_ERR_KERN_STOP_FAIL; |
2f77fc4b DG |
1573 | goto error; |
1574 | } | |
1575 | ||
1576 | kernel_wait_quiescent(kernel_tracer_fd); | |
9b6c7ec5 DG |
1577 | |
1578 | ksession->started = 0; | |
2f77fc4b DG |
1579 | } |
1580 | ||
1581 | if (usess) { | |
1582 | usess->start_trace = 0; | |
1583 | ||
1584 | ret = ust_app_stop_trace_all(usess); | |
1585 | if (ret < 0) { | |
f73fabfd | 1586 | ret = LTTNG_ERR_UST_STOP_FAIL; |
2f77fc4b DG |
1587 | goto error; |
1588 | } | |
1589 | } | |
1590 | ||
9b6c7ec5 DG |
1591 | session->started = 0; |
1592 | ||
f73fabfd | 1593 | ret = LTTNG_OK; |
2f77fc4b DG |
1594 | |
1595 | error: | |
1596 | return ret; | |
1597 | } | |
1598 | ||
1599 | /* | |
1600 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
1601 | */ | |
1602 | int cmd_set_consumer_uri(int domain, struct ltt_session *session, | |
1603 | size_t nb_uri, struct lttng_uri *uris) | |
1604 | { | |
1605 | int ret, i; | |
1606 | struct ltt_kernel_session *ksess = session->kernel_session; | |
1607 | struct ltt_ust_session *usess = session->ust_session; | |
1608 | struct consumer_output *consumer = NULL; | |
1609 | ||
1610 | assert(session); | |
1611 | assert(uris); | |
1612 | assert(nb_uri > 0); | |
1613 | ||
1614 | /* Can't enable consumer after session started. */ | |
1615 | if (session->enabled) { | |
f73fabfd | 1616 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
1617 | goto error; |
1618 | } | |
1619 | ||
2f77fc4b DG |
1620 | /* |
1621 | * This case switch makes sure the domain session has a temporary consumer | |
1622 | * so the URL can be set. | |
1623 | */ | |
1624 | switch (domain) { | |
1625 | case 0: | |
1626 | /* Code flow error. A session MUST always have a consumer object */ | |
1627 | assert(session->consumer); | |
1628 | /* | |
1629 | * The URL will be added to the tracing session consumer instead of a | |
1630 | * specific domain consumer. | |
1631 | */ | |
1632 | consumer = session->consumer; | |
1633 | break; | |
1634 | case LTTNG_DOMAIN_KERNEL: | |
1635 | /* Code flow error if we don't have a kernel session here. */ | |
1636 | assert(ksess); | |
1637 | ||
1638 | /* Create consumer output if none exists */ | |
1639 | consumer = ksess->tmp_consumer; | |
1640 | if (consumer == NULL) { | |
1641 | consumer = consumer_copy_output(ksess->consumer); | |
1642 | if (consumer == NULL) { | |
f73fabfd | 1643 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1644 | goto error; |
1645 | } | |
1646 | /* Trash the consumer subdir, we are about to set a new one. */ | |
1647 | memset(consumer->subdir, 0, sizeof(consumer->subdir)); | |
1648 | ksess->tmp_consumer = consumer; | |
1649 | } | |
1650 | ||
1651 | break; | |
1652 | case LTTNG_DOMAIN_UST: | |
1653 | /* Code flow error if we don't have a kernel session here. */ | |
1654 | assert(usess); | |
1655 | ||
1656 | /* Create consumer output if none exists */ | |
1657 | consumer = usess->tmp_consumer; | |
1658 | if (consumer == NULL) { | |
1659 | consumer = consumer_copy_output(usess->consumer); | |
1660 | if (consumer == NULL) { | |
f73fabfd | 1661 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1662 | goto error; |
1663 | } | |
1664 | /* Trash the consumer subdir, we are about to set a new one. */ | |
1665 | memset(consumer->subdir, 0, sizeof(consumer->subdir)); | |
1666 | usess->tmp_consumer = consumer; | |
1667 | } | |
1668 | ||
1669 | break; | |
1670 | } | |
1671 | ||
1672 | for (i = 0; i < nb_uri; i++) { | |
2f77fc4b DG |
1673 | ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name); |
1674 | if (ret < 0) { | |
1675 | goto error; | |
1676 | } | |
2f77fc4b DG |
1677 | } |
1678 | ||
1679 | /* All good! */ | |
f73fabfd | 1680 | ret = LTTNG_OK; |
2f77fc4b DG |
1681 | |
1682 | error: | |
1683 | return ret; | |
1684 | } | |
1685 | ||
1686 | /* | |
1687 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
1688 | */ | |
1689 | int cmd_create_session_uri(char *name, struct lttng_uri *uris, | |
1690 | size_t nb_uri, lttng_sock_cred *creds) | |
1691 | { | |
1692 | int ret; | |
1693 | char *path = NULL; | |
1694 | struct ltt_session *session; | |
1695 | ||
1696 | assert(name); | |
1697 | ||
1698 | /* | |
1699 | * Verify if the session already exist | |
1700 | * | |
1701 | * XXX: There is no need for the session lock list here since the caller | |
1702 | * (process_client_msg) is holding it. We might want to change that so a | |
1703 | * single command does not lock the entire session list. | |
1704 | */ | |
1705 | session = session_find_by_name(name); | |
1706 | if (session != NULL) { | |
f73fabfd | 1707 | ret = LTTNG_ERR_EXIST_SESS; |
2f77fc4b DG |
1708 | goto find_error; |
1709 | } | |
1710 | ||
1711 | /* Create tracing session in the registry */ | |
1712 | ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds), | |
1713 | LTTNG_SOCK_GET_GID_CRED(creds)); | |
f73fabfd | 1714 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1715 | goto session_error; |
1716 | } | |
1717 | ||
1718 | /* | |
1719 | * Get the newly created session pointer back | |
1720 | * | |
1721 | * XXX: There is no need for the session lock list here since the caller | |
1722 | * (process_client_msg) is holding it. We might want to change that so a | |
1723 | * single command does not lock the entire session list. | |
1724 | */ | |
1725 | session = session_find_by_name(name); | |
1726 | assert(session); | |
1727 | ||
1728 | /* Create default consumer output for the session not yet created. */ | |
1729 | session->consumer = consumer_create_output(CONSUMER_DST_LOCAL); | |
1730 | if (session->consumer == NULL) { | |
f73fabfd | 1731 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1732 | goto consumer_error; |
1733 | } | |
1734 | ||
1735 | /* | |
1736 | * This means that the lttng_create_session call was called with the _path_ | |
1737 | * argument set to NULL. | |
1738 | */ | |
1739 | if (uris == NULL) { | |
1740 | /* | |
1741 | * At this point, we'll skip the consumer URI setup and create a | |
1742 | * session with a NULL path which will flag the session to NOT spawn a | |
1743 | * consumer. | |
1744 | */ | |
1745 | DBG("Create session %s with NO uri, skipping consumer setup", name); | |
1746 | goto end; | |
1747 | } | |
1748 | ||
1749 | session->start_consumer = 1; | |
1750 | ||
1751 | ret = cmd_set_consumer_uri(0, session, nb_uri, uris); | |
f73fabfd | 1752 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1753 | goto consumer_error; |
1754 | } | |
1755 | ||
1756 | session->consumer->enabled = 1; | |
1757 | ||
1758 | end: | |
f73fabfd | 1759 | return LTTNG_OK; |
2f77fc4b DG |
1760 | |
1761 | consumer_error: | |
1762 | session_destroy(session); | |
1763 | session_error: | |
1764 | find_error: | |
1765 | return ret; | |
1766 | } | |
1767 | ||
1768 | /* | |
1769 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
1770 | */ | |
1771 | int cmd_destroy_session(struct ltt_session *session, int wpipe) | |
1772 | { | |
1773 | int ret; | |
1774 | struct ltt_ust_session *usess; | |
1775 | struct ltt_kernel_session *ksess; | |
1776 | ||
1777 | /* Safety net */ | |
1778 | assert(session); | |
1779 | ||
1780 | usess = session->ust_session; | |
1781 | ksess = session->kernel_session; | |
1782 | ||
1783 | /* Clean kernel session teardown */ | |
1784 | kernel_destroy_session(ksess); | |
1785 | ||
1786 | /* UST session teardown */ | |
1787 | if (usess) { | |
1788 | /* Close any relayd session */ | |
1789 | consumer_output_send_destroy_relayd(usess->consumer); | |
1790 | ||
1791 | /* Destroy every UST application related to this session. */ | |
1792 | ret = ust_app_destroy_trace_all(usess); | |
1793 | if (ret) { | |
1794 | ERR("Error in ust_app_destroy_trace_all"); | |
1795 | } | |
1796 | ||
1797 | /* Clean up the rest. */ | |
1798 | trace_ust_destroy_session(usess); | |
1799 | } | |
1800 | ||
1801 | /* | |
1802 | * Must notify the kernel thread here to update it's poll set in order to | |
1803 | * remove the channel(s)' fd just destroyed. | |
1804 | */ | |
1805 | ret = notify_thread_pipe(wpipe); | |
1806 | if (ret < 0) { | |
1807 | PERROR("write kernel poll pipe"); | |
1808 | } | |
1809 | ||
1810 | ret = session_destroy(session); | |
1811 | ||
1812 | return ret; | |
1813 | } | |
1814 | ||
1815 | /* | |
1816 | * Command LTTNG_CALIBRATE processed by the client thread. | |
1817 | */ | |
1818 | int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
1819 | { | |
1820 | int ret; | |
1821 | ||
1822 | switch (domain) { | |
1823 | case LTTNG_DOMAIN_KERNEL: | |
1824 | { | |
1825 | struct lttng_kernel_calibrate kcalibrate; | |
1826 | ||
1827 | kcalibrate.type = calibrate->type; | |
1828 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
1829 | if (ret < 0) { | |
f73fabfd | 1830 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
2f77fc4b DG |
1831 | goto error; |
1832 | } | |
1833 | break; | |
1834 | } | |
1835 | case LTTNG_DOMAIN_UST: | |
1836 | { | |
1837 | struct lttng_ust_calibrate ucalibrate; | |
1838 | ||
1839 | ucalibrate.type = calibrate->type; | |
1840 | ret = ust_app_calibrate_glb(&ucalibrate); | |
1841 | if (ret < 0) { | |
f73fabfd | 1842 | ret = LTTNG_ERR_UST_CALIBRATE_FAIL; |
2f77fc4b DG |
1843 | goto error; |
1844 | } | |
1845 | break; | |
1846 | } | |
1847 | default: | |
f73fabfd | 1848 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1849 | goto error; |
1850 | } | |
1851 | ||
f73fabfd | 1852 | ret = LTTNG_OK; |
2f77fc4b DG |
1853 | |
1854 | error: | |
1855 | return ret; | |
1856 | } | |
1857 | ||
1858 | /* | |
1859 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
1860 | */ | |
1861 | int cmd_register_consumer(struct ltt_session *session, int domain, | |
1862 | const char *sock_path, struct consumer_data *cdata) | |
1863 | { | |
1864 | int ret, sock; | |
1865 | struct consumer_socket *socket; | |
1866 | ||
1867 | assert(session); | |
1868 | assert(cdata); | |
1869 | assert(sock_path); | |
1870 | ||
1871 | switch (domain) { | |
1872 | case LTTNG_DOMAIN_KERNEL: | |
1873 | { | |
1874 | struct ltt_kernel_session *ksess = session->kernel_session; | |
1875 | ||
1876 | assert(ksess); | |
1877 | ||
1878 | /* Can't register a consumer if there is already one */ | |
1879 | if (ksess->consumer_fds_sent != 0) { | |
f73fabfd | 1880 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
1881 | goto error; |
1882 | } | |
1883 | ||
1884 | sock = lttcomm_connect_unix_sock(sock_path); | |
1885 | if (sock < 0) { | |
f73fabfd | 1886 | ret = LTTNG_ERR_CONNECT_FAIL; |
2f77fc4b DG |
1887 | goto error; |
1888 | } | |
1889 | ||
1890 | socket = consumer_allocate_socket(sock); | |
1891 | if (socket == NULL) { | |
f66c074c DG |
1892 | ret = close(sock); |
1893 | if (ret < 0) { | |
1894 | PERROR("close register consumer"); | |
1895 | } | |
f73fabfd | 1896 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1897 | goto error; |
1898 | } | |
1899 | ||
1900 | socket->lock = zmalloc(sizeof(pthread_mutex_t)); | |
1901 | if (socket->lock == NULL) { | |
1902 | PERROR("zmalloc pthread mutex"); | |
f73fabfd | 1903 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1904 | goto error; |
1905 | } | |
1906 | pthread_mutex_init(socket->lock, NULL); | |
1907 | socket->registered = 1; | |
1908 | ||
1909 | rcu_read_lock(); | |
1910 | consumer_add_socket(socket, ksess->consumer); | |
1911 | rcu_read_unlock(); | |
1912 | ||
1913 | pthread_mutex_lock(&cdata->pid_mutex); | |
1914 | cdata->pid = -1; | |
1915 | pthread_mutex_unlock(&cdata->pid_mutex); | |
1916 | ||
1917 | break; | |
1918 | } | |
1919 | default: | |
1920 | /* TODO: Userspace tracing */ | |
f73fabfd | 1921 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1922 | goto error; |
1923 | } | |
1924 | ||
f73fabfd | 1925 | ret = LTTNG_OK; |
2f77fc4b DG |
1926 | |
1927 | error: | |
1928 | return ret; | |
1929 | } | |
1930 | ||
1931 | /* | |
1932 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
1933 | */ | |
1934 | ssize_t cmd_list_domains(struct ltt_session *session, | |
1935 | struct lttng_domain **domains) | |
1936 | { | |
1937 | int ret, index = 0; | |
1938 | ssize_t nb_dom = 0; | |
1939 | ||
1940 | if (session->kernel_session != NULL) { | |
1941 | DBG3("Listing domains found kernel domain"); | |
1942 | nb_dom++; | |
1943 | } | |
1944 | ||
1945 | if (session->ust_session != NULL) { | |
1946 | DBG3("Listing domains found UST global domain"); | |
1947 | nb_dom++; | |
1948 | } | |
1949 | ||
1950 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); | |
1951 | if (*domains == NULL) { | |
f73fabfd | 1952 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1953 | goto error; |
1954 | } | |
1955 | ||
1956 | if (session->kernel_session != NULL) { | |
1957 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
1958 | index++; | |
1959 | } | |
1960 | ||
1961 | if (session->ust_session != NULL) { | |
1962 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
1963 | index++; | |
1964 | } | |
1965 | ||
1966 | return nb_dom; | |
1967 | ||
1968 | error: | |
f73fabfd DG |
1969 | /* Return negative value to differentiate return code */ |
1970 | return -ret; | |
2f77fc4b DG |
1971 | } |
1972 | ||
1973 | ||
1974 | /* | |
1975 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
1976 | */ | |
1977 | ssize_t cmd_list_channels(int domain, struct ltt_session *session, | |
1978 | struct lttng_channel **channels) | |
1979 | { | |
1980 | int ret; | |
1981 | ssize_t nb_chan = 0; | |
1982 | ||
1983 | switch (domain) { | |
1984 | case LTTNG_DOMAIN_KERNEL: | |
1985 | if (session->kernel_session != NULL) { | |
1986 | nb_chan = session->kernel_session->channel_count; | |
1987 | } | |
1988 | DBG3("Number of kernel channels %zd", nb_chan); | |
c7d620a2 DG |
1989 | if (nb_chan <= 0) { |
1990 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; | |
1991 | } | |
2f77fc4b DG |
1992 | break; |
1993 | case LTTNG_DOMAIN_UST: | |
1994 | if (session->ust_session != NULL) { | |
1995 | nb_chan = lttng_ht_get_count( | |
1996 | session->ust_session->domain_global.channels); | |
1997 | } | |
1998 | DBG3("Number of UST global channels %zd", nb_chan); | |
c7d620a2 DG |
1999 | if (nb_chan <= 0) { |
2000 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
2001 | } | |
2f77fc4b DG |
2002 | break; |
2003 | default: | |
2004 | *channels = NULL; | |
f73fabfd | 2005 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2006 | goto error; |
2007 | } | |
2008 | ||
2009 | if (nb_chan > 0) { | |
2010 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
2011 | if (*channels == NULL) { | |
f73fabfd | 2012 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2013 | goto error; |
2014 | } | |
2015 | ||
2016 | list_lttng_channels(domain, session, *channels); | |
2017 | } else { | |
2018 | *channels = NULL; | |
c7d620a2 DG |
2019 | /* Ret value was set in the domain switch case */ |
2020 | goto error; | |
2f77fc4b DG |
2021 | } |
2022 | ||
2023 | return nb_chan; | |
2024 | ||
2025 | error: | |
f73fabfd DG |
2026 | /* Return negative value to differentiate return code */ |
2027 | return -ret; | |
2f77fc4b DG |
2028 | } |
2029 | ||
2030 | /* | |
2031 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
2032 | */ | |
2033 | ssize_t cmd_list_events(int domain, struct ltt_session *session, | |
2034 | char *channel_name, struct lttng_event **events) | |
2035 | { | |
2036 | int ret = 0; | |
2037 | ssize_t nb_event = 0; | |
2038 | ||
2039 | switch (domain) { | |
2040 | case LTTNG_DOMAIN_KERNEL: | |
2041 | if (session->kernel_session != NULL) { | |
2042 | nb_event = list_lttng_kernel_events(channel_name, | |
2043 | session->kernel_session, events); | |
2044 | } | |
2045 | break; | |
2046 | case LTTNG_DOMAIN_UST: | |
2047 | { | |
2048 | if (session->ust_session != NULL) { | |
2049 | nb_event = list_lttng_ust_global_events(channel_name, | |
2050 | &session->ust_session->domain_global, events); | |
2051 | } | |
2052 | break; | |
2053 | } | |
2054 | default: | |
f73fabfd | 2055 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2056 | goto error; |
2057 | } | |
2058 | ||
f73fabfd | 2059 | return nb_event; |
2f77fc4b DG |
2060 | |
2061 | error: | |
f73fabfd DG |
2062 | /* Return negative value to differentiate return code */ |
2063 | return -ret; | |
2f77fc4b DG |
2064 | } |
2065 | ||
2066 | /* | |
2067 | * Using the session list, filled a lttng_session array to send back to the | |
2068 | * client for session listing. | |
2069 | * | |
2070 | * The session list lock MUST be acquired before calling this function. Use | |
2071 | * session_lock_list() and session_unlock_list(). | |
2072 | */ | |
2073 | void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid, | |
2074 | gid_t gid) | |
2075 | { | |
2076 | int ret; | |
2077 | unsigned int i = 0; | |
2078 | struct ltt_session *session; | |
2079 | struct ltt_session_list *list = session_get_list(); | |
2080 | ||
2081 | DBG("Getting all available session for UID %d GID %d", | |
2082 | uid, gid); | |
2083 | /* | |
2084 | * Iterate over session list and append data after the control struct in | |
2085 | * the buffer. | |
2086 | */ | |
2087 | cds_list_for_each_entry(session, &list->head, list) { | |
2088 | /* | |
2089 | * Only list the sessions the user can control. | |
2090 | */ | |
2091 | if (!session_access_ok(session, uid, gid)) { | |
2092 | continue; | |
2093 | } | |
2094 | ||
2095 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2096 | struct ltt_ust_session *usess = session->ust_session; | |
2097 | ||
2098 | if (session->consumer->type == CONSUMER_DST_NET || | |
2099 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
2100 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
2101 | ret = build_network_session_path(sessions[i].path, | |
2102 | sizeof(session[i].path), session); | |
2103 | } else { | |
2104 | ret = snprintf(sessions[i].path, sizeof(session[i].path), "%s", | |
2105 | session->consumer->dst.trace_path); | |
2106 | } | |
2107 | if (ret < 0) { | |
2108 | PERROR("snprintf session path"); | |
2109 | continue; | |
2110 | } | |
2111 | ||
2112 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
2113 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
2114 | sessions[i].enabled = session->enabled; | |
2115 | i++; | |
2116 | } | |
2117 | } | |
2118 | ||
2119 | /* | |
2120 | * Command LTTNG_DISABLE_CONSUMER processed by the client thread. | |
2121 | */ | |
2122 | int cmd_disable_consumer(int domain, struct ltt_session *session) | |
2123 | { | |
2124 | int ret; | |
2125 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2126 | struct ltt_ust_session *usess = session->ust_session; | |
2127 | struct consumer_output *consumer; | |
2128 | ||
2129 | assert(session); | |
2130 | ||
2131 | if (session->enabled) { | |
2132 | /* Can't disable consumer on an already started session */ | |
f73fabfd | 2133 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2134 | goto error; |
2135 | } | |
2136 | ||
2137 | if (!session->start_consumer) { | |
f73fabfd | 2138 | ret = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
2139 | goto error; |
2140 | } | |
2141 | ||
2142 | switch (domain) { | |
2143 | case 0: | |
2144 | DBG("Disable tracing session %s consumer", session->name); | |
2145 | consumer = session->consumer; | |
2146 | break; | |
2147 | case LTTNG_DOMAIN_KERNEL: | |
2148 | /* Code flow error if we don't have a kernel session here. */ | |
2149 | assert(ksess); | |
2150 | ||
2151 | DBG("Disabling kernel consumer"); | |
2152 | consumer = ksess->consumer; | |
2153 | ||
2154 | break; | |
2155 | case LTTNG_DOMAIN_UST: | |
2156 | /* Code flow error if we don't have a UST session here. */ | |
2157 | assert(usess); | |
2158 | ||
2159 | DBG("Disabling UST consumer"); | |
2160 | consumer = usess->consumer; | |
2161 | ||
2162 | break; | |
2163 | default: | |
f73fabfd | 2164 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
2165 | goto error; |
2166 | } | |
2167 | ||
2168 | if (consumer) { | |
2169 | consumer->enabled = 0; | |
2170 | /* Success at this point */ | |
f73fabfd | 2171 | ret = LTTNG_OK; |
2f77fc4b | 2172 | } else { |
f73fabfd | 2173 | ret = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
2174 | } |
2175 | ||
2176 | error: | |
2177 | return ret; | |
2178 | } | |
2179 | ||
2180 | /* | |
2181 | * Command LTTNG_ENABLE_CONSUMER processed by the client thread. | |
2182 | */ | |
2183 | int cmd_enable_consumer(int domain, struct ltt_session *session) | |
2184 | { | |
2185 | int ret; | |
2186 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2187 | struct ltt_ust_session *usess = session->ust_session; | |
2188 | struct consumer_output *consumer = NULL; | |
2189 | ||
2190 | assert(session); | |
2191 | ||
2192 | /* Can't enable consumer after session started. */ | |
2193 | if (session->enabled) { | |
f73fabfd | 2194 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2195 | goto error; |
2196 | } | |
2197 | ||
2f77fc4b DG |
2198 | switch (domain) { |
2199 | case 0: | |
2200 | assert(session->consumer); | |
2201 | consumer = session->consumer; | |
2202 | break; | |
2203 | case LTTNG_DOMAIN_KERNEL: | |
2204 | /* Code flow error if we don't have a kernel session here. */ | |
2205 | assert(ksess); | |
2206 | ||
2207 | /* | |
2208 | * Check if we have already sent fds to the consumer. In that case, | |
2209 | * the enable-consumer command can't be used because a start trace | |
2210 | * had previously occured. | |
2211 | */ | |
2212 | if (ksess->consumer_fds_sent) { | |
f73fabfd | 2213 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
2214 | goto error; |
2215 | } | |
2216 | ||
2217 | consumer = ksess->tmp_consumer; | |
2218 | if (consumer == NULL) { | |
f73fabfd | 2219 | ret = LTTNG_OK; |
2f77fc4b DG |
2220 | /* No temp. consumer output exists. Using the current one. */ |
2221 | DBG3("No temporary consumer. Using default"); | |
2222 | consumer = ksess->consumer; | |
2223 | goto error; | |
2224 | } | |
2225 | ||
2226 | switch (consumer->type) { | |
2227 | case CONSUMER_DST_LOCAL: | |
2228 | DBG2("Consumer output is local. Creating directory(ies)"); | |
2229 | ||
2230 | /* Create directory(ies) */ | |
2231 | ret = run_as_mkdir_recursive(consumer->dst.trace_path, | |
2232 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
2233 | if (ret < 0) { | |
2234 | if (ret != -EEXIST) { | |
2235 | ERR("Trace directory creation error"); | |
f73fabfd | 2236 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2237 | goto error; |
2238 | } | |
2239 | } | |
2240 | break; | |
2241 | case CONSUMER_DST_NET: | |
2242 | DBG2("Consumer output is network. Validating URIs"); | |
2243 | /* Validate if we have both control and data path set. */ | |
2244 | if (!consumer->dst.net.control_isset) { | |
f73fabfd | 2245 | ret = LTTNG_ERR_URL_CTRL_MISS; |
2f77fc4b DG |
2246 | goto error; |
2247 | } | |
2248 | ||
2249 | if (!consumer->dst.net.data_isset) { | |
f73fabfd | 2250 | ret = LTTNG_ERR_URL_DATA_MISS; |
2f77fc4b DG |
2251 | goto error; |
2252 | } | |
2253 | ||
2254 | /* Check established network session state */ | |
2255 | if (session->net_handle == 0) { | |
f73fabfd | 2256 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
2257 | ERR("Session network handle is not set on enable-consumer"); |
2258 | goto error; | |
2259 | } | |
2260 | ||
2261 | break; | |
2262 | } | |
2263 | ||
2f77fc4b DG |
2264 | /* |
2265 | * @session-lock | |
2266 | * This is race free for now since the session lock is acquired before | |
2267 | * ending up in this function. No other threads can access this kernel | |
2268 | * session without this lock hence freeing the consumer output object | |
2269 | * is valid. | |
2270 | */ | |
2271 | rcu_read_lock(); | |
9a572cf5 | 2272 | /* Destroy current consumer. We are about to replace it */ |
2f77fc4b DG |
2273 | consumer_destroy_output(ksess->consumer); |
2274 | rcu_read_unlock(); | |
2275 | ksess->consumer = consumer; | |
2276 | ksess->tmp_consumer = NULL; | |
2277 | ||
2278 | break; | |
2279 | case LTTNG_DOMAIN_UST: | |
2280 | /* Code flow error if we don't have a UST session here. */ | |
2281 | assert(usess); | |
2282 | ||
2283 | /* | |
2284 | * Check if we have already sent fds to the consumer. In that case, | |
2285 | * the enable-consumer command can't be used because a start trace | |
2286 | * had previously occured. | |
2287 | */ | |
2288 | if (usess->start_trace) { | |
f73fabfd | 2289 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
2290 | goto error; |
2291 | } | |
2292 | ||
2293 | consumer = usess->tmp_consumer; | |
2294 | if (consumer == NULL) { | |
f73fabfd | 2295 | ret = LTTNG_OK; |
2f77fc4b DG |
2296 | /* No temp. consumer output exists. Using the current one. */ |
2297 | DBG3("No temporary consumer. Using default"); | |
2298 | consumer = usess->consumer; | |
2299 | goto error; | |
2300 | } | |
2301 | ||
2302 | switch (consumer->type) { | |
2303 | case CONSUMER_DST_LOCAL: | |
2304 | DBG2("Consumer output is local. Creating directory(ies)"); | |
2305 | ||
2306 | /* Create directory(ies) */ | |
2307 | ret = run_as_mkdir_recursive(consumer->dst.trace_path, | |
2308 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
2309 | if (ret < 0) { | |
2310 | if (ret != -EEXIST) { | |
2311 | ERR("Trace directory creation error"); | |
f73fabfd | 2312 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2313 | goto error; |
2314 | } | |
2315 | } | |
2316 | break; | |
2317 | case CONSUMER_DST_NET: | |
2318 | DBG2("Consumer output is network. Validating URIs"); | |
2319 | /* Validate if we have both control and data path set. */ | |
2320 | if (!consumer->dst.net.control_isset) { | |
f73fabfd | 2321 | ret = LTTNG_ERR_URL_CTRL_MISS; |
2f77fc4b DG |
2322 | goto error; |
2323 | } | |
2324 | ||
2325 | if (!consumer->dst.net.data_isset) { | |
f73fabfd | 2326 | ret = LTTNG_ERR_URL_DATA_MISS; |
2f77fc4b DG |
2327 | goto error; |
2328 | } | |
2329 | ||
2330 | /* Check established network session state */ | |
2331 | if (session->net_handle == 0) { | |
f73fabfd | 2332 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
2333 | DBG2("Session network handle is not set on enable-consumer"); |
2334 | goto error; | |
2335 | } | |
2336 | ||
2337 | if (consumer->net_seq_index == -1) { | |
f73fabfd | 2338 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
2339 | DBG2("Network index is not set on the consumer"); |
2340 | goto error; | |
2341 | } | |
2342 | ||
2343 | break; | |
2344 | } | |
2345 | ||
2f77fc4b DG |
2346 | /* |
2347 | * @session-lock | |
2348 | * This is race free for now since the session lock is acquired before | |
2349 | * ending up in this function. No other threads can access this kernel | |
2350 | * session without this lock hence freeing the consumer output object | |
2351 | * is valid. | |
2352 | */ | |
2353 | rcu_read_lock(); | |
9a572cf5 | 2354 | /* Destroy current consumer. We are about to replace it */ |
2f77fc4b DG |
2355 | consumer_destroy_output(usess->consumer); |
2356 | rcu_read_unlock(); | |
2357 | usess->consumer = consumer; | |
2358 | usess->tmp_consumer = NULL; | |
2359 | ||
2360 | break; | |
2361 | } | |
2362 | ||
4b35a6b3 DG |
2363 | session->start_consumer = 1; |
2364 | ||
2f77fc4b DG |
2365 | /* Enable it */ |
2366 | if (consumer) { | |
2367 | consumer->enabled = 1; | |
2368 | /* Success at this point */ | |
f73fabfd | 2369 | ret = LTTNG_OK; |
2f77fc4b DG |
2370 | } else { |
2371 | /* Should not really happend... */ | |
f73fabfd | 2372 | ret = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
2373 | } |
2374 | ||
2375 | error: | |
2376 | return ret; | |
2377 | } | |
2378 | ||
806e2684 | 2379 | /* |
6d805429 DG |
2380 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
2381 | * ready for trace analysis (or anykind of reader) or else 1 for pending data. | |
806e2684 | 2382 | */ |
6d805429 | 2383 | int cmd_data_pending(struct ltt_session *session) |
806e2684 DG |
2384 | { |
2385 | int ret; | |
2386 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2387 | struct ltt_ust_session *usess = session->ust_session; | |
2388 | ||
2389 | assert(session); | |
2390 | ||
2391 | /* Session MUST be stopped to ask for data availability. */ | |
2392 | if (session->enabled) { | |
2393 | ret = LTTNG_ERR_SESSION_STARTED; | |
2394 | goto error; | |
2395 | } | |
2396 | ||
2397 | if (ksess && ksess->consumer) { | |
6d805429 DG |
2398 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
2399 | if (ret == 1) { | |
806e2684 DG |
2400 | /* Data is still being extracted for the kernel. */ |
2401 | goto error; | |
2402 | } | |
2403 | } | |
2404 | ||
2405 | if (usess && usess->consumer) { | |
6d805429 DG |
2406 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
2407 | if (ret == 1) { | |
806e2684 DG |
2408 | /* Data is still being extracted for the kernel. */ |
2409 | goto error; | |
2410 | } | |
2411 | } | |
2412 | ||
2413 | /* Data is ready to be read by a viewer */ | |
6d805429 | 2414 | ret = 0; |
806e2684 DG |
2415 | |
2416 | error: | |
2417 | return ret; | |
2418 | } | |
2419 | ||
2f77fc4b DG |
2420 | /* |
2421 | * Init command subsystem. | |
2422 | */ | |
2423 | void cmd_init(void) | |
2424 | { | |
2425 | /* | |
2426 | * Set network sequence index to 1 for streams to match a relayd socket on | |
2427 | * the consumer side. | |
2428 | */ | |
2429 | uatomic_set(&relayd_net_seq_idx, 1); | |
2430 | ||
2431 | DBG("Command subsystem initialized"); | |
2432 | } |