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> | |
6dc3064a | 20 | #include <inttypes.h> |
2f77fc4b DG |
21 | #include <urcu/list.h> |
22 | #include <urcu/uatomic.h> | |
23 | ||
24 | #include <common/defaults.h> | |
25 | #include <common/common.h> | |
26 | #include <common/sessiond-comm/sessiond-comm.h> | |
27 | #include <common/relayd/relayd.h> | |
10a50311 | 28 | #include <common/utils.h> |
2f77fc4b DG |
29 | |
30 | #include "channel.h" | |
31 | #include "consumer.h" | |
32 | #include "event.h" | |
7972aab2 | 33 | #include "health.h" |
2f77fc4b DG |
34 | #include "kernel.h" |
35 | #include "kernel-consumer.h" | |
36 | #include "lttng-sessiond.h" | |
37 | #include "utils.h" | |
38 | ||
39 | #include "cmd.h" | |
40 | ||
41 | /* | |
42 | * Used to keep a unique index for each relayd socket created where this value | |
43 | * is associated with streams on the consumer so it can match the right relayd | |
d88aee68 DG |
44 | * to send to. It must be accessed with the relayd_net_seq_idx_lock |
45 | * held. | |
2f77fc4b | 46 | */ |
d88aee68 DG |
47 | static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER; |
48 | static uint64_t relayd_net_seq_idx; | |
2f77fc4b DG |
49 | |
50 | /* | |
51 | * Create a session path used by list_lttng_sessions for the case that the | |
52 | * session consumer is on the network. | |
53 | */ | |
54 | static int build_network_session_path(char *dst, size_t size, | |
55 | struct ltt_session *session) | |
56 | { | |
57 | int ret, kdata_port, udata_port; | |
58 | struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL; | |
59 | char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX]; | |
60 | ||
61 | assert(session); | |
62 | assert(dst); | |
63 | ||
64 | memset(tmp_urls, 0, sizeof(tmp_urls)); | |
65 | memset(tmp_uurl, 0, sizeof(tmp_uurl)); | |
66 | ||
67 | kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT; | |
68 | ||
69 | if (session->kernel_session && session->kernel_session->consumer) { | |
70 | kuri = &session->kernel_session->consumer->dst.net.control; | |
71 | kdata_port = session->kernel_session->consumer->dst.net.data.port; | |
72 | } | |
73 | ||
74 | if (session->ust_session && session->ust_session->consumer) { | |
75 | uuri = &session->ust_session->consumer->dst.net.control; | |
76 | udata_port = session->ust_session->consumer->dst.net.data.port; | |
77 | } | |
78 | ||
79 | if (uuri == NULL && kuri == NULL) { | |
80 | uri = &session->consumer->dst.net.control; | |
81 | kdata_port = session->consumer->dst.net.data.port; | |
82 | } else if (kuri && uuri) { | |
83 | ret = uri_compare(kuri, uuri); | |
84 | if (ret) { | |
85 | /* Not Equal */ | |
86 | uri = kuri; | |
87 | /* Build uuri URL string */ | |
88 | ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl)); | |
89 | if (ret < 0) { | |
90 | goto error; | |
91 | } | |
92 | } else { | |
93 | uri = kuri; | |
94 | } | |
95 | } else if (kuri && uuri == NULL) { | |
96 | uri = kuri; | |
97 | } else if (uuri && kuri == NULL) { | |
98 | uri = uuri; | |
99 | } | |
100 | ||
101 | ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls)); | |
102 | if (ret < 0) { | |
103 | goto error; | |
104 | } | |
105 | ||
9aa9f900 DG |
106 | /* |
107 | * Do we have a UST url set. If yes, this means we have both kernel and UST | |
108 | * to print. | |
109 | */ | |
9d035200 | 110 | if (*tmp_uurl != '\0') { |
2f77fc4b DG |
111 | ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]", |
112 | tmp_urls, kdata_port, tmp_uurl, udata_port); | |
113 | } else { | |
9aa9f900 | 114 | int dport; |
bef08707 | 115 | if (kuri || (!kuri && !uuri)) { |
9aa9f900 DG |
116 | dport = kdata_port; |
117 | } else { | |
118 | /* No kernel URI, use the UST port. */ | |
119 | dport = udata_port; | |
120 | } | |
121 | ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport); | |
2f77fc4b DG |
122 | } |
123 | ||
124 | error: | |
125 | return ret; | |
126 | } | |
127 | ||
128 | /* | |
129 | * Fill lttng_channel array of all channels. | |
130 | */ | |
131 | static void list_lttng_channels(int domain, struct ltt_session *session, | |
132 | struct lttng_channel *channels) | |
133 | { | |
134 | int i = 0; | |
135 | struct ltt_kernel_channel *kchan; | |
136 | ||
137 | DBG("Listing channels for session %s", session->name); | |
138 | ||
139 | switch (domain) { | |
140 | case LTTNG_DOMAIN_KERNEL: | |
141 | /* Kernel channels */ | |
142 | if (session->kernel_session != NULL) { | |
143 | cds_list_for_each_entry(kchan, | |
144 | &session->kernel_session->channel_list.head, list) { | |
145 | /* Copy lttng_channel struct to array */ | |
146 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
147 | channels[i].enabled = kchan->enabled; | |
148 | i++; | |
149 | } | |
150 | } | |
151 | break; | |
152 | case LTTNG_DOMAIN_UST: | |
153 | { | |
154 | struct lttng_ht_iter iter; | |
155 | struct ltt_ust_channel *uchan; | |
156 | ||
e7fe706f | 157 | rcu_read_lock(); |
2f77fc4b DG |
158 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
159 | &iter.iter, uchan, node.node) { | |
160 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); | |
161 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
162 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
163 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
164 | channels[i].attr.switch_timer_interval = | |
165 | uchan->attr.switch_timer_interval; | |
166 | channels[i].attr.read_timer_interval = | |
167 | uchan->attr.read_timer_interval; | |
168 | channels[i].enabled = uchan->enabled; | |
169 | switch (uchan->attr.output) { | |
170 | case LTTNG_UST_MMAP: | |
171 | default: | |
172 | channels[i].attr.output = LTTNG_EVENT_MMAP; | |
173 | break; | |
174 | } | |
175 | i++; | |
176 | } | |
e7fe706f | 177 | rcu_read_unlock(); |
2f77fc4b DG |
178 | break; |
179 | } | |
180 | default: | |
181 | break; | |
182 | } | |
183 | } | |
184 | ||
185 | /* | |
186 | * Create a list of ust global domain events. | |
187 | */ | |
188 | static int list_lttng_ust_global_events(char *channel_name, | |
189 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
190 | { | |
191 | int i = 0, ret = 0; | |
192 | unsigned int nb_event = 0; | |
193 | struct lttng_ht_iter iter; | |
194 | struct lttng_ht_node_str *node; | |
195 | struct ltt_ust_channel *uchan; | |
196 | struct ltt_ust_event *uevent; | |
197 | struct lttng_event *tmp; | |
198 | ||
199 | DBG("Listing UST global events for channel %s", channel_name); | |
200 | ||
201 | rcu_read_lock(); | |
202 | ||
203 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); | |
204 | node = lttng_ht_iter_get_node_str(&iter); | |
205 | if (node == NULL) { | |
f73fabfd | 206 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
207 | goto error; |
208 | } | |
209 | ||
210 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); | |
211 | ||
212 | nb_event += lttng_ht_get_count(uchan->events); | |
213 | ||
214 | if (nb_event == 0) { | |
215 | ret = nb_event; | |
216 | goto error; | |
217 | } | |
218 | ||
219 | DBG3("Listing UST global %d events", nb_event); | |
220 | ||
221 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
222 | if (tmp == NULL) { | |
f73fabfd | 223 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
224 | goto error; |
225 | } | |
226 | ||
227 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { | |
228 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); | |
229 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
230 | tmp[i].enabled = uevent->enabled; | |
231 | ||
232 | switch (uevent->attr.instrumentation) { | |
233 | case LTTNG_UST_TRACEPOINT: | |
234 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
235 | break; | |
236 | case LTTNG_UST_PROBE: | |
237 | tmp[i].type = LTTNG_EVENT_PROBE; | |
238 | break; | |
239 | case LTTNG_UST_FUNCTION: | |
240 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
241 | break; | |
242 | } | |
243 | ||
244 | tmp[i].loglevel = uevent->attr.loglevel; | |
245 | switch (uevent->attr.loglevel_type) { | |
246 | case LTTNG_UST_LOGLEVEL_ALL: | |
247 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
248 | break; | |
249 | case LTTNG_UST_LOGLEVEL_RANGE: | |
250 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; | |
251 | break; | |
252 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
253 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; | |
254 | break; | |
255 | } | |
256 | if (uevent->filter) { | |
257 | tmp[i].filter = 1; | |
258 | } | |
259 | i++; | |
260 | } | |
261 | ||
262 | ret = nb_event; | |
263 | *events = tmp; | |
264 | ||
265 | error: | |
266 | rcu_read_unlock(); | |
267 | return ret; | |
268 | } | |
269 | ||
270 | /* | |
271 | * Fill lttng_event array of all kernel events in the channel. | |
272 | */ | |
273 | static int list_lttng_kernel_events(char *channel_name, | |
274 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
275 | { | |
276 | int i = 0, ret; | |
277 | unsigned int nb_event; | |
278 | struct ltt_kernel_event *event; | |
279 | struct ltt_kernel_channel *kchan; | |
280 | ||
281 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
282 | if (kchan == NULL) { | |
f73fabfd | 283 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
284 | goto error; |
285 | } | |
286 | ||
287 | nb_event = kchan->event_count; | |
288 | ||
289 | DBG("Listing events for channel %s", kchan->channel->name); | |
290 | ||
291 | if (nb_event == 0) { | |
f73fabfd | 292 | goto end; |
2f77fc4b DG |
293 | } |
294 | ||
295 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
296 | if (*events == NULL) { | |
f73fabfd | 297 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
298 | goto error; |
299 | } | |
300 | ||
301 | /* Kernel channels */ | |
302 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
303 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
304 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
305 | (*events)[i].enabled = event->enabled; | |
306 | ||
307 | switch (event->event->instrumentation) { | |
308 | case LTTNG_KERNEL_TRACEPOINT: | |
309 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; | |
310 | break; | |
2f77fc4b | 311 | case LTTNG_KERNEL_KRETPROBE: |
1896972b DG |
312 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
313 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
314 | sizeof(struct lttng_kernel_kprobe)); | |
315 | break; | |
316 | case LTTNG_KERNEL_KPROBE: | |
2f77fc4b DG |
317 | (*events)[i].type = LTTNG_EVENT_PROBE; |
318 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
319 | sizeof(struct lttng_kernel_kprobe)); | |
320 | break; | |
321 | case LTTNG_KERNEL_FUNCTION: | |
322 | (*events)[i].type = LTTNG_EVENT_FUNCTION; | |
323 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
324 | sizeof(struct lttng_kernel_function)); | |
325 | break; | |
326 | case LTTNG_KERNEL_NOOP: | |
327 | (*events)[i].type = LTTNG_EVENT_NOOP; | |
328 | break; | |
329 | case LTTNG_KERNEL_SYSCALL: | |
330 | (*events)[i].type = LTTNG_EVENT_SYSCALL; | |
331 | break; | |
332 | case LTTNG_KERNEL_ALL: | |
333 | assert(0); | |
334 | break; | |
335 | } | |
336 | i++; | |
337 | } | |
338 | ||
f73fabfd | 339 | end: |
2f77fc4b DG |
340 | return nb_event; |
341 | ||
342 | error: | |
f73fabfd DG |
343 | /* Negate the error code to differentiate the size from an error */ |
344 | return -ret; | |
2f77fc4b DG |
345 | } |
346 | ||
347 | /* | |
348 | * Add URI so the consumer output object. Set the correct path depending on the | |
349 | * domain adding the default trace directory. | |
350 | */ | |
351 | static int add_uri_to_consumer(struct consumer_output *consumer, | |
352 | struct lttng_uri *uri, int domain, const char *session_name) | |
353 | { | |
f73fabfd | 354 | int ret = LTTNG_OK; |
2f77fc4b DG |
355 | const char *default_trace_dir; |
356 | ||
357 | assert(uri); | |
358 | ||
359 | if (consumer == NULL) { | |
360 | DBG("No consumer detected. Don't add URI. Stopping."); | |
f73fabfd | 361 | ret = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
362 | goto error; |
363 | } | |
364 | ||
365 | switch (domain) { | |
366 | case LTTNG_DOMAIN_KERNEL: | |
367 | default_trace_dir = DEFAULT_KERNEL_TRACE_DIR; | |
368 | break; | |
369 | case LTTNG_DOMAIN_UST: | |
370 | default_trace_dir = DEFAULT_UST_TRACE_DIR; | |
371 | break; | |
372 | default: | |
373 | /* | |
374 | * This case is possible is we try to add the URI to the global tracing | |
375 | * session consumer object which in this case there is no subdir. | |
376 | */ | |
377 | default_trace_dir = ""; | |
378 | } | |
379 | ||
380 | switch (uri->dtype) { | |
381 | case LTTNG_DST_IPV4: | |
382 | case LTTNG_DST_IPV6: | |
383 | DBG2("Setting network URI to consumer"); | |
384 | ||
df75acac DG |
385 | if (consumer->type == CONSUMER_DST_NET) { |
386 | if ((uri->stype == LTTNG_STREAM_CONTROL && | |
785d2d0d DG |
387 | consumer->dst.net.control_isset) || |
388 | (uri->stype == LTTNG_STREAM_DATA && | |
389 | consumer->dst.net.data_isset)) { | |
df75acac DG |
390 | ret = LTTNG_ERR_URL_EXIST; |
391 | goto error; | |
392 | } | |
393 | } else { | |
394 | memset(&consumer->dst.net, 0, sizeof(consumer->dst.net)); | |
785d2d0d DG |
395 | } |
396 | ||
df75acac DG |
397 | consumer->type = CONSUMER_DST_NET; |
398 | ||
2f77fc4b DG |
399 | /* Set URI into consumer output object */ |
400 | ret = consumer_set_network_uri(consumer, uri); | |
401 | if (ret < 0) { | |
a74934ba | 402 | ret = -ret; |
2f77fc4b DG |
403 | goto error; |
404 | } else if (ret == 1) { | |
405 | /* | |
406 | * URI was the same in the consumer so we do not append the subdir | |
407 | * again so to not duplicate output dir. | |
408 | */ | |
409 | goto error; | |
410 | } | |
411 | ||
412 | if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) { | |
413 | ret = consumer_set_subdir(consumer, session_name); | |
414 | if (ret < 0) { | |
f73fabfd | 415 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
416 | goto error; |
417 | } | |
418 | } | |
419 | ||
420 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
421 | /* On a new subdir, reappend the default trace dir. */ | |
c30ce0b3 CB |
422 | strncat(consumer->subdir, default_trace_dir, |
423 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
424 | DBG3("Append domain trace name to subdir %s", consumer->subdir); |
425 | } | |
426 | ||
427 | break; | |
428 | case LTTNG_DST_PATH: | |
429 | DBG2("Setting trace directory path from URI to %s", uri->dst.path); | |
430 | memset(consumer->dst.trace_path, 0, | |
431 | sizeof(consumer->dst.trace_path)); | |
432 | strncpy(consumer->dst.trace_path, uri->dst.path, | |
433 | sizeof(consumer->dst.trace_path)); | |
434 | /* Append default trace dir */ | |
435 | strncat(consumer->dst.trace_path, default_trace_dir, | |
c30ce0b3 CB |
436 | sizeof(consumer->dst.trace_path) - |
437 | strlen(consumer->dst.trace_path) - 1); | |
2f77fc4b DG |
438 | /* Flag consumer as local. */ |
439 | consumer->type = CONSUMER_DST_LOCAL; | |
440 | break; | |
441 | } | |
442 | ||
a74934ba DG |
443 | ret = LTTNG_OK; |
444 | ||
2f77fc4b DG |
445 | error: |
446 | return ret; | |
447 | } | |
448 | ||
449 | /* | |
450 | * Init tracing by creating trace directory and sending fds kernel consumer. | |
451 | */ | |
452 | static int init_kernel_tracing(struct ltt_kernel_session *session) | |
453 | { | |
454 | int ret = 0; | |
455 | struct lttng_ht_iter iter; | |
456 | struct consumer_socket *socket; | |
457 | ||
458 | assert(session); | |
459 | ||
e7fe706f DG |
460 | rcu_read_lock(); |
461 | ||
2f77fc4b DG |
462 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { |
463 | cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter, | |
464 | socket, node.node) { | |
2f77fc4b | 465 | pthread_mutex_lock(socket->lock); |
f50f23d9 | 466 | ret = kernel_consumer_send_session(socket, session); |
2f77fc4b DG |
467 | pthread_mutex_unlock(socket->lock); |
468 | if (ret < 0) { | |
f73fabfd | 469 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
470 | goto error; |
471 | } | |
472 | } | |
473 | } | |
474 | ||
475 | error: | |
e7fe706f | 476 | rcu_read_unlock(); |
2f77fc4b DG |
477 | return ret; |
478 | } | |
479 | ||
480 | /* | |
481 | * Create a socket to the relayd using the URI. | |
482 | * | |
483 | * On success, the relayd_sock pointer is set to the created socket. | |
484 | * Else, it's stays untouched and a lttcomm error code is returned. | |
485 | */ | |
6151a90f JD |
486 | static int create_connect_relayd(struct lttng_uri *uri, |
487 | struct lttcomm_relayd_sock **relayd_sock) | |
2f77fc4b DG |
488 | { |
489 | int ret; | |
6151a90f | 490 | struct lttcomm_relayd_sock *rsock; |
2f77fc4b | 491 | |
6151a90f JD |
492 | rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR, |
493 | RELAYD_VERSION_COMM_MINOR); | |
494 | if (!rsock) { | |
f73fabfd | 495 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
496 | goto error; |
497 | } | |
498 | ||
ffe60014 DG |
499 | /* |
500 | * Connect to relayd so we can proceed with a session creation. This call | |
501 | * can possibly block for an arbitrary amount of time to set the health | |
502 | * state to be in poll execution. | |
503 | */ | |
504 | health_poll_entry(); | |
6151a90f | 505 | ret = relayd_connect(rsock); |
ffe60014 | 506 | health_poll_exit(); |
2f77fc4b DG |
507 | if (ret < 0) { |
508 | ERR("Unable to reach lttng-relayd"); | |
f73fabfd | 509 | ret = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
510 | goto free_sock; |
511 | } | |
512 | ||
513 | /* Create socket for control stream. */ | |
514 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
515 | DBG3("Creating relayd stream socket from URI"); | |
516 | ||
517 | /* Check relayd version */ | |
6151a90f | 518 | ret = relayd_version_check(rsock); |
2f77fc4b | 519 | if (ret < 0) { |
f73fabfd | 520 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; |
2f77fc4b DG |
521 | goto close_sock; |
522 | } | |
523 | } else if (uri->stype == LTTNG_STREAM_DATA) { | |
524 | DBG3("Creating relayd data socket from URI"); | |
525 | } else { | |
526 | /* Command is not valid */ | |
527 | ERR("Relayd invalid stream type: %d", uri->stype); | |
f73fabfd | 528 | ret = LTTNG_ERR_INVALID; |
2f77fc4b DG |
529 | goto close_sock; |
530 | } | |
531 | ||
6151a90f | 532 | *relayd_sock = rsock; |
2f77fc4b | 533 | |
f73fabfd | 534 | return LTTNG_OK; |
2f77fc4b DG |
535 | |
536 | close_sock: | |
6151a90f JD |
537 | /* The returned value is not useful since we are on an error path. */ |
538 | (void) relayd_close(rsock); | |
2f77fc4b | 539 | free_sock: |
6151a90f | 540 | free(rsock); |
2f77fc4b DG |
541 | error: |
542 | return ret; | |
543 | } | |
544 | ||
545 | /* | |
546 | * Connect to the relayd using URI and send the socket to the right consumer. | |
547 | */ | |
6dc3064a | 548 | static int send_consumer_relayd_socket(int domain, unsigned int session_id, |
2f77fc4b | 549 | struct lttng_uri *relayd_uri, struct consumer_output *consumer, |
f50f23d9 | 550 | struct consumer_socket *consumer_sock) |
2f77fc4b DG |
551 | { |
552 | int ret; | |
6151a90f | 553 | struct lttcomm_relayd_sock *rsock = NULL; |
2f77fc4b | 554 | |
ffe60014 | 555 | /* Connect to relayd and make version check if uri is the control. */ |
6151a90f | 556 | ret = create_connect_relayd(relayd_uri, &rsock); |
ffe60014 | 557 | if (ret != LTTNG_OK) { |
6151a90f | 558 | goto error; |
ffe60014 | 559 | } |
6151a90f | 560 | assert(rsock); |
ffe60014 | 561 | |
2f77fc4b | 562 | /* Set the network sequence index if not set. */ |
d88aee68 DG |
563 | if (consumer->net_seq_index == (uint64_t) -1ULL) { |
564 | pthread_mutex_lock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
565 | /* |
566 | * Increment net_seq_idx because we are about to transfer the | |
567 | * new relayd socket to the consumer. | |
d88aee68 | 568 | * Assign unique key so the consumer can match streams. |
2f77fc4b | 569 | */ |
d88aee68 DG |
570 | consumer->net_seq_index = ++relayd_net_seq_idx; |
571 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
572 | } |
573 | ||
2f77fc4b | 574 | /* Send relayd socket to consumer. */ |
6151a90f | 575 | ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer, |
6dc3064a | 576 | relayd_uri->stype, session_id); |
2f77fc4b | 577 | if (ret < 0) { |
f73fabfd | 578 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
579 | goto close_sock; |
580 | } | |
581 | ||
c890b720 DG |
582 | /* Flag that the corresponding socket was sent. */ |
583 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
ffe60014 | 584 | consumer_sock->control_sock_sent = 1; |
c890b720 | 585 | } else if (relayd_uri->stype == LTTNG_STREAM_DATA) { |
ffe60014 | 586 | consumer_sock->data_sock_sent = 1; |
c890b720 DG |
587 | } |
588 | ||
f73fabfd | 589 | ret = LTTNG_OK; |
2f77fc4b DG |
590 | |
591 | /* | |
592 | * Close socket which was dup on the consumer side. The session daemon does | |
593 | * NOT keep track of the relayd socket(s) once transfer to the consumer. | |
594 | */ | |
595 | ||
596 | close_sock: | |
6151a90f JD |
597 | (void) relayd_close(rsock); |
598 | free(rsock); | |
2f77fc4b | 599 | |
6151a90f | 600 | error: |
ffe60014 DG |
601 | if (ret != LTTNG_OK) { |
602 | /* | |
d9078d0c DG |
603 | * The consumer output for this session should not be used anymore |
604 | * since the relayd connection failed thus making any tracing or/and | |
605 | * streaming not usable. | |
ffe60014 | 606 | */ |
d9078d0c | 607 | consumer->enabled = 0; |
ffe60014 | 608 | } |
2f77fc4b DG |
609 | return ret; |
610 | } | |
611 | ||
612 | /* | |
613 | * Send both relayd sockets to a specific consumer and domain. This is a | |
614 | * helper function to facilitate sending the information to the consumer for a | |
615 | * session. | |
616 | */ | |
6dc3064a DG |
617 | static int send_consumer_relayd_sockets(int domain, unsigned int session_id, |
618 | struct consumer_output *consumer, struct consumer_socket *sock) | |
2f77fc4b | 619 | { |
dda67f6c | 620 | int ret = LTTNG_OK; |
2f77fc4b | 621 | |
2f77fc4b | 622 | assert(consumer); |
6dc3064a | 623 | assert(sock); |
2f77fc4b | 624 | |
2f77fc4b | 625 | /* Sending control relayd socket. */ |
ffe60014 | 626 | if (!sock->control_sock_sent) { |
6dc3064a | 627 | ret = send_consumer_relayd_socket(domain, session_id, |
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) { |
6dc3064a | 636 | ret = send_consumer_relayd_socket(domain, session_id, |
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 | ||
785d2d0d | 665 | DBG("Setting relayd for session %s", session->name); |
2f77fc4b | 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) { | |
2f77fc4b | 674 | pthread_mutex_lock(socket->lock); |
6dc3064a | 675 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id, |
f50f23d9 | 676 | usess->consumer, socket); |
2f77fc4b | 677 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 678 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
679 | goto error; |
680 | } | |
6dc3064a DG |
681 | /* Session is now ready for network streaming. */ |
682 | session->net_handle = 1; | |
2f77fc4b DG |
683 | } |
684 | } | |
685 | ||
686 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET | |
687 | && ksess->consumer->enabled) { | |
688 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
689 | socket, node.node) { | |
2f77fc4b | 690 | pthread_mutex_lock(socket->lock); |
6dc3064a | 691 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id, |
f50f23d9 | 692 | ksess->consumer, socket); |
2f77fc4b | 693 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 694 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
695 | goto error; |
696 | } | |
6dc3064a DG |
697 | /* Session is now ready for network streaming. */ |
698 | session->net_handle = 1; | |
2f77fc4b DG |
699 | } |
700 | } | |
701 | ||
702 | error: | |
e7fe706f | 703 | rcu_read_unlock(); |
2f77fc4b DG |
704 | return ret; |
705 | } | |
706 | ||
9b6c7ec5 DG |
707 | /* |
708 | * Start a kernel session by opening all necessary streams. | |
709 | */ | |
710 | static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe) | |
711 | { | |
712 | int ret; | |
713 | struct ltt_kernel_channel *kchan; | |
714 | ||
715 | /* Open kernel metadata */ | |
07b86b52 | 716 | if (ksess->metadata == NULL && ksess->output_traces) { |
9b6c7ec5 DG |
717 | ret = kernel_open_metadata(ksess); |
718 | if (ret < 0) { | |
719 | ret = LTTNG_ERR_KERN_META_FAIL; | |
720 | goto error; | |
721 | } | |
722 | } | |
723 | ||
724 | /* Open kernel metadata stream */ | |
07b86b52 | 725 | if (ksess->metadata && ksess->metadata_stream_fd < 0) { |
9b6c7ec5 DG |
726 | ret = kernel_open_metadata_stream(ksess); |
727 | if (ret < 0) { | |
728 | ERR("Kernel create metadata stream failed"); | |
729 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
730 | goto error; | |
731 | } | |
732 | } | |
733 | ||
734 | /* For each channel */ | |
735 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
736 | if (kchan->stream_count == 0) { | |
737 | ret = kernel_open_channel_stream(kchan); | |
738 | if (ret < 0) { | |
739 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
740 | goto error; | |
741 | } | |
742 | /* Update the stream global counter */ | |
743 | ksess->stream_count_global += ret; | |
744 | } | |
745 | } | |
746 | ||
747 | /* Setup kernel consumer socket and send fds to it */ | |
748 | ret = init_kernel_tracing(ksess); | |
e43c41c5 | 749 | if (ret != 0) { |
9b6c7ec5 DG |
750 | ret = LTTNG_ERR_KERN_START_FAIL; |
751 | goto error; | |
752 | } | |
753 | ||
754 | /* This start the kernel tracing */ | |
755 | ret = kernel_start_session(ksess); | |
756 | if (ret < 0) { | |
757 | ret = LTTNG_ERR_KERN_START_FAIL; | |
758 | goto error; | |
759 | } | |
760 | ||
761 | /* Quiescent wait after starting trace */ | |
784303b0 | 762 | kernel_wait_quiescent(kernel_tracer_fd); |
9b6c7ec5 DG |
763 | |
764 | ksess->started = 1; | |
765 | ||
766 | ret = LTTNG_OK; | |
767 | ||
768 | error: | |
769 | return ret; | |
770 | } | |
771 | ||
2f77fc4b DG |
772 | /* |
773 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. | |
774 | */ | |
775 | int cmd_disable_channel(struct ltt_session *session, int domain, | |
776 | char *channel_name) | |
777 | { | |
778 | int ret; | |
779 | struct ltt_ust_session *usess; | |
780 | ||
781 | usess = session->ust_session; | |
782 | ||
2223c96f DG |
783 | rcu_read_lock(); |
784 | ||
2f77fc4b DG |
785 | switch (domain) { |
786 | case LTTNG_DOMAIN_KERNEL: | |
787 | { | |
788 | ret = channel_kernel_disable(session->kernel_session, | |
789 | channel_name); | |
f73fabfd | 790 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
791 | goto error; |
792 | } | |
793 | ||
794 | kernel_wait_quiescent(kernel_tracer_fd); | |
795 | break; | |
796 | } | |
797 | case LTTNG_DOMAIN_UST: | |
798 | { | |
799 | struct ltt_ust_channel *uchan; | |
800 | struct lttng_ht *chan_ht; | |
801 | ||
802 | chan_ht = usess->domain_global.channels; | |
803 | ||
804 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
805 | if (uchan == NULL) { | |
f73fabfd | 806 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
807 | goto error; |
808 | } | |
809 | ||
7972aab2 | 810 | ret = channel_ust_disable(usess, uchan); |
f73fabfd | 811 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
812 | goto error; |
813 | } | |
814 | break; | |
815 | } | |
816 | #if 0 | |
817 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
818 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
819 | case LTTNG_DOMAIN_UST_PID: | |
820 | #endif | |
821 | default: | |
f73fabfd | 822 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
823 | goto error; |
824 | } | |
825 | ||
f73fabfd | 826 | ret = LTTNG_OK; |
2f77fc4b DG |
827 | |
828 | error: | |
2223c96f | 829 | rcu_read_unlock(); |
2f77fc4b DG |
830 | return ret; |
831 | } | |
832 | ||
833 | /* | |
834 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
835 | * | |
836 | * The wpipe arguments is used as a notifier for the kernel thread. | |
837 | */ | |
838 | int cmd_enable_channel(struct ltt_session *session, | |
7972aab2 | 839 | struct lttng_domain *domain, struct lttng_channel *attr, int wpipe) |
2f77fc4b DG |
840 | { |
841 | int ret; | |
842 | struct ltt_ust_session *usess = session->ust_session; | |
843 | struct lttng_ht *chan_ht; | |
844 | ||
845 | assert(session); | |
846 | assert(attr); | |
7972aab2 | 847 | assert(domain); |
2f77fc4b DG |
848 | |
849 | DBG("Enabling channel %s for session %s", attr->name, session->name); | |
850 | ||
03b4fdcf DG |
851 | rcu_read_lock(); |
852 | ||
1124da52 DG |
853 | /* |
854 | * The ringbuffer (both in user space and kernel) behave badly in overwrite | |
855 | * mode and with less than 2 subbuf so block it right away and send back an | |
856 | * invalid attribute error. | |
857 | */ | |
858 | if (attr->attr.overwrite && attr->attr.num_subbuf < 2) { | |
859 | ret = LTTNG_ERR_INVALID; | |
860 | goto error; | |
861 | } | |
862 | ||
7972aab2 | 863 | switch (domain->type) { |
2f77fc4b DG |
864 | case LTTNG_DOMAIN_KERNEL: |
865 | { | |
866 | struct ltt_kernel_channel *kchan; | |
867 | ||
2f77fc4b DG |
868 | kchan = trace_kernel_get_channel_by_name(attr->name, |
869 | session->kernel_session); | |
870 | if (kchan == NULL) { | |
4d2a627b MD |
871 | /* |
872 | * Don't try to create a channel if the session | |
873 | * has been started at some point in time | |
874 | * before. The tracer does not allow it. | |
875 | */ | |
876 | if (session->started) { | |
877 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; | |
878 | goto error; | |
879 | } | |
2f77fc4b | 880 | ret = channel_kernel_create(session->kernel_session, attr, wpipe); |
85076754 MD |
881 | if (attr->name[0] != '\0') { |
882 | session->kernel_session->has_non_default_channel = 1; | |
883 | } | |
2f77fc4b DG |
884 | } else { |
885 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
886 | } | |
887 | ||
f73fabfd | 888 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
889 | goto error; |
890 | } | |
891 | ||
784303b0 | 892 | kernel_wait_quiescent(kernel_tracer_fd); |
2f77fc4b DG |
893 | break; |
894 | } | |
895 | case LTTNG_DOMAIN_UST: | |
896 | { | |
897 | struct ltt_ust_channel *uchan; | |
898 | ||
899 | chan_ht = usess->domain_global.channels; | |
900 | ||
901 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); | |
902 | if (uchan == NULL) { | |
4d2a627b MD |
903 | /* |
904 | * Don't try to create a channel if the session | |
905 | * has been started at some point in time | |
906 | * before. The tracer does not allow it. | |
907 | */ | |
908 | if (session->started) { | |
909 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; | |
910 | goto error; | |
911 | } | |
7972aab2 | 912 | ret = channel_ust_create(usess, attr, domain->buf_type); |
85076754 MD |
913 | if (attr->name[0] != '\0') { |
914 | usess->has_non_default_channel = 1; | |
915 | } | |
2f77fc4b | 916 | } else { |
7972aab2 | 917 | ret = channel_ust_enable(usess, uchan); |
2f77fc4b DG |
918 | } |
919 | break; | |
920 | } | |
2f77fc4b | 921 | default: |
f73fabfd | 922 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
923 | goto error; |
924 | } | |
925 | ||
926 | error: | |
2223c96f | 927 | rcu_read_unlock(); |
2f77fc4b DG |
928 | return ret; |
929 | } | |
930 | ||
931 | ||
932 | /* | |
933 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
934 | */ | |
935 | int cmd_disable_event(struct ltt_session *session, int domain, | |
936 | char *channel_name, char *event_name) | |
937 | { | |
938 | int ret; | |
939 | ||
2223c96f DG |
940 | rcu_read_lock(); |
941 | ||
2f77fc4b DG |
942 | switch (domain) { |
943 | case LTTNG_DOMAIN_KERNEL: | |
944 | { | |
945 | struct ltt_kernel_channel *kchan; | |
946 | struct ltt_kernel_session *ksess; | |
947 | ||
948 | ksess = session->kernel_session; | |
949 | ||
85076754 MD |
950 | /* |
951 | * If a non-default channel has been created in the | |
952 | * session, explicitely require that -c chan_name needs | |
953 | * to be provided. | |
954 | */ | |
955 | if (ksess->has_non_default_channel && channel_name[0] == '\0') { | |
956 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
957 | goto error; | |
958 | } | |
959 | ||
2f77fc4b DG |
960 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
961 | if (kchan == NULL) { | |
f73fabfd | 962 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
963 | goto error; |
964 | } | |
965 | ||
d3a56674 | 966 | ret = event_kernel_disable_tracepoint(kchan, event_name); |
f73fabfd | 967 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
968 | goto error; |
969 | } | |
970 | ||
971 | kernel_wait_quiescent(kernel_tracer_fd); | |
972 | break; | |
973 | } | |
974 | case LTTNG_DOMAIN_UST: | |
975 | { | |
976 | struct ltt_ust_channel *uchan; | |
977 | struct ltt_ust_session *usess; | |
978 | ||
979 | usess = session->ust_session; | |
980 | ||
85076754 MD |
981 | /* |
982 | * If a non-default channel has been created in the | |
983 | * session, explicitely require that -c chan_name needs | |
984 | * to be provided. | |
985 | */ | |
986 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
987 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
988 | goto error; | |
989 | } | |
990 | ||
2f77fc4b DG |
991 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
992 | channel_name); | |
993 | if (uchan == NULL) { | |
f73fabfd | 994 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
995 | goto error; |
996 | } | |
997 | ||
7972aab2 | 998 | ret = event_ust_disable_tracepoint(usess, uchan, event_name); |
f73fabfd | 999 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1000 | goto error; |
1001 | } | |
1002 | ||
1003 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
1004 | channel_name); | |
1005 | break; | |
1006 | } | |
1007 | #if 0 | |
1008 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
1009 | case LTTNG_DOMAIN_UST_PID: | |
1010 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
1011 | #endif | |
1012 | default: | |
f73fabfd | 1013 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1014 | goto error; |
1015 | } | |
1016 | ||
f73fabfd | 1017 | ret = LTTNG_OK; |
2f77fc4b DG |
1018 | |
1019 | error: | |
2223c96f | 1020 | rcu_read_unlock(); |
2f77fc4b DG |
1021 | return ret; |
1022 | } | |
1023 | ||
1024 | /* | |
1025 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
1026 | */ | |
1027 | int cmd_disable_event_all(struct ltt_session *session, int domain, | |
1028 | char *channel_name) | |
1029 | { | |
1030 | int ret; | |
1031 | ||
2223c96f DG |
1032 | rcu_read_lock(); |
1033 | ||
2f77fc4b DG |
1034 | switch (domain) { |
1035 | case LTTNG_DOMAIN_KERNEL: | |
1036 | { | |
1037 | struct ltt_kernel_session *ksess; | |
1038 | struct ltt_kernel_channel *kchan; | |
1039 | ||
1040 | ksess = session->kernel_session; | |
1041 | ||
85076754 MD |
1042 | /* |
1043 | * If a non-default channel has been created in the | |
1044 | * session, explicitely require that -c chan_name needs | |
1045 | * to be provided. | |
1046 | */ | |
1047 | if (ksess->has_non_default_channel && channel_name[0] == '\0') { | |
1048 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1049 | goto error; | |
1050 | } | |
1051 | ||
2f77fc4b DG |
1052 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
1053 | if (kchan == NULL) { | |
f73fabfd | 1054 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
1055 | goto error; |
1056 | } | |
1057 | ||
d3a56674 | 1058 | ret = event_kernel_disable_all(kchan); |
f73fabfd | 1059 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1060 | goto error; |
1061 | } | |
1062 | ||
1063 | kernel_wait_quiescent(kernel_tracer_fd); | |
1064 | break; | |
1065 | } | |
1066 | case LTTNG_DOMAIN_UST: | |
1067 | { | |
1068 | struct ltt_ust_session *usess; | |
1069 | struct ltt_ust_channel *uchan; | |
1070 | ||
1071 | usess = session->ust_session; | |
1072 | ||
85076754 MD |
1073 | /* |
1074 | * If a non-default channel has been created in the | |
1075 | * session, explicitely require that -c chan_name needs | |
1076 | * to be provided. | |
1077 | */ | |
1078 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1079 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1080 | goto error; | |
1081 | } | |
1082 | ||
2f77fc4b DG |
1083 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
1084 | channel_name); | |
1085 | if (uchan == NULL) { | |
f73fabfd | 1086 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
1087 | goto error; |
1088 | } | |
1089 | ||
7972aab2 | 1090 | ret = event_ust_disable_all_tracepoints(usess, uchan); |
2f77fc4b DG |
1091 | if (ret != 0) { |
1092 | goto error; | |
1093 | } | |
1094 | ||
1095 | DBG3("Disable all UST events in channel %s completed", channel_name); | |
1096 | ||
1097 | break; | |
1098 | } | |
1099 | #if 0 | |
1100 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
1101 | case LTTNG_DOMAIN_UST_PID: | |
1102 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
1103 | #endif | |
1104 | default: | |
f73fabfd | 1105 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1106 | goto error; |
1107 | } | |
1108 | ||
f73fabfd | 1109 | ret = LTTNG_OK; |
2f77fc4b DG |
1110 | |
1111 | error: | |
2223c96f | 1112 | rcu_read_unlock(); |
2f77fc4b DG |
1113 | return ret; |
1114 | } | |
1115 | ||
1116 | /* | |
1117 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1118 | */ | |
1119 | int cmd_add_context(struct ltt_session *session, int domain, | |
601d5acf | 1120 | char *channel_name, struct lttng_event_context *ctx, int kwpipe) |
2f77fc4b | 1121 | { |
d5979e4a | 1122 | int ret, chan_kern_created = 0, chan_ust_created = 0; |
2f77fc4b DG |
1123 | |
1124 | switch (domain) { | |
1125 | case LTTNG_DOMAIN_KERNEL: | |
979e618e DG |
1126 | assert(session->kernel_session); |
1127 | ||
1128 | if (session->kernel_session->channel_count == 0) { | |
1129 | /* Create default channel */ | |
1130 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); | |
1131 | if (ret != LTTNG_OK) { | |
1132 | goto error; | |
1133 | } | |
d5979e4a | 1134 | chan_kern_created = 1; |
979e618e | 1135 | } |
2f77fc4b | 1136 | /* Add kernel context to kernel tracer */ |
601d5acf | 1137 | ret = context_kernel_add(session->kernel_session, ctx, channel_name); |
f73fabfd | 1138 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1139 | goto error; |
1140 | } | |
1141 | break; | |
1142 | case LTTNG_DOMAIN_UST: | |
1143 | { | |
1144 | struct ltt_ust_session *usess = session->ust_session; | |
85076754 MD |
1145 | unsigned int chan_count; |
1146 | ||
2f77fc4b DG |
1147 | assert(usess); |
1148 | ||
85076754 | 1149 | chan_count = lttng_ht_get_count(usess->domain_global.channels); |
979e618e DG |
1150 | if (chan_count == 0) { |
1151 | struct lttng_channel *attr; | |
1152 | /* Create default channel */ | |
0a9c6494 | 1153 | attr = channel_new_default_attr(domain, usess->buffer_type); |
979e618e DG |
1154 | if (attr == NULL) { |
1155 | ret = LTTNG_ERR_FATAL; | |
1156 | goto error; | |
1157 | } | |
1158 | ||
7972aab2 | 1159 | ret = channel_ust_create(usess, attr, usess->buffer_type); |
979e618e DG |
1160 | if (ret != LTTNG_OK) { |
1161 | free(attr); | |
1162 | goto error; | |
1163 | } | |
1164 | free(attr); | |
d5979e4a | 1165 | chan_ust_created = 1; |
979e618e DG |
1166 | } |
1167 | ||
601d5acf | 1168 | ret = context_ust_add(usess, domain, ctx, channel_name); |
f73fabfd | 1169 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1170 | goto error; |
1171 | } | |
1172 | break; | |
1173 | } | |
1174 | #if 0 | |
1175 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
1176 | case LTTNG_DOMAIN_UST_PID: | |
1177 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
1178 | #endif | |
1179 | default: | |
f73fabfd | 1180 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1181 | goto error; |
1182 | } | |
1183 | ||
d5979e4a | 1184 | return LTTNG_OK; |
2f77fc4b DG |
1185 | |
1186 | error: | |
d5979e4a DG |
1187 | if (chan_kern_created) { |
1188 | struct ltt_kernel_channel *kchan = | |
1189 | trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME, | |
1190 | session->kernel_session); | |
1191 | /* Created previously, this should NOT fail. */ | |
1192 | assert(kchan); | |
1193 | kernel_destroy_channel(kchan); | |
1194 | } | |
1195 | ||
1196 | if (chan_ust_created) { | |
1197 | struct ltt_ust_channel *uchan = | |
1198 | trace_ust_find_channel_by_name( | |
1199 | session->ust_session->domain_global.channels, | |
1200 | DEFAULT_CHANNEL_NAME); | |
1201 | /* Created previously, this should NOT fail. */ | |
1202 | assert(uchan); | |
1203 | /* Remove from the channel list of the session. */ | |
1204 | trace_ust_delete_channel(session->ust_session->domain_global.channels, | |
1205 | uchan); | |
1206 | trace_ust_destroy_channel(uchan); | |
1207 | } | |
2f77fc4b DG |
1208 | return ret; |
1209 | } | |
1210 | ||
2f77fc4b DG |
1211 | /* |
1212 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
1213 | */ | |
7972aab2 | 1214 | int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain, |
025faf73 DG |
1215 | char *channel_name, struct lttng_event *event, |
1216 | struct lttng_filter_bytecode *filter, int wpipe) | |
2f77fc4b | 1217 | { |
e5f5db7f | 1218 | int ret, channel_created = 0; |
2f77fc4b DG |
1219 | struct lttng_channel *attr; |
1220 | ||
1221 | assert(session); | |
1222 | assert(event); | |
1223 | assert(channel_name); | |
1224 | ||
2223c96f DG |
1225 | rcu_read_lock(); |
1226 | ||
7972aab2 | 1227 | switch (domain->type) { |
2f77fc4b DG |
1228 | case LTTNG_DOMAIN_KERNEL: |
1229 | { | |
1230 | struct ltt_kernel_channel *kchan; | |
1231 | ||
85076754 MD |
1232 | /* |
1233 | * If a non-default channel has been created in the | |
1234 | * session, explicitely require that -c chan_name needs | |
1235 | * to be provided. | |
1236 | */ | |
1237 | if (session->kernel_session->has_non_default_channel | |
1238 | && channel_name[0] == '\0') { | |
1239 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1240 | goto error; | |
1241 | } | |
1242 | ||
2f77fc4b DG |
1243 | kchan = trace_kernel_get_channel_by_name(channel_name, |
1244 | session->kernel_session); | |
1245 | if (kchan == NULL) { | |
0a9c6494 DG |
1246 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
1247 | LTTNG_BUFFER_GLOBAL); | |
2f77fc4b | 1248 | if (attr == NULL) { |
f73fabfd | 1249 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1250 | goto error; |
1251 | } | |
1252 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1253 | ||
1254 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1255 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1256 | free(attr); |
1257 | goto error; | |
1258 | } | |
1259 | free(attr); | |
e5f5db7f DG |
1260 | |
1261 | channel_created = 1; | |
2f77fc4b DG |
1262 | } |
1263 | ||
1264 | /* Get the newly created kernel channel pointer */ | |
1265 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1266 | session->kernel_session); | |
1267 | if (kchan == NULL) { | |
1268 | /* This sould not happen... */ | |
f73fabfd | 1269 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1270 | goto error; |
1271 | } | |
1272 | ||
d3a56674 | 1273 | ret = event_kernel_enable_tracepoint(kchan, event); |
f73fabfd | 1274 | if (ret != LTTNG_OK) { |
e5f5db7f DG |
1275 | if (channel_created) { |
1276 | /* Let's not leak a useless channel. */ | |
1277 | kernel_destroy_channel(kchan); | |
1278 | } | |
2f77fc4b DG |
1279 | goto error; |
1280 | } | |
1281 | ||
1282 | kernel_wait_quiescent(kernel_tracer_fd); | |
1283 | break; | |
1284 | } | |
1285 | case LTTNG_DOMAIN_UST: | |
1286 | { | |
1287 | struct ltt_ust_channel *uchan; | |
1288 | struct ltt_ust_session *usess = session->ust_session; | |
1289 | ||
1290 | assert(usess); | |
1291 | ||
85076754 MD |
1292 | /* |
1293 | * If a non-default channel has been created in the | |
1294 | * session, explicitely require that -c chan_name needs | |
1295 | * to be provided. | |
1296 | */ | |
1297 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1298 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1299 | goto error; | |
1300 | } | |
1301 | ||
2f77fc4b DG |
1302 | /* Get channel from global UST domain */ |
1303 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
1304 | channel_name); | |
1305 | if (uchan == NULL) { | |
1306 | /* Create default channel */ | |
0a9c6494 DG |
1307 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
1308 | usess->buffer_type); | |
2f77fc4b | 1309 | if (attr == NULL) { |
f73fabfd | 1310 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1311 | goto error; |
1312 | } | |
1313 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1314 | ||
1315 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1316 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1317 | free(attr); |
1318 | goto error; | |
1319 | } | |
1320 | free(attr); | |
1321 | ||
1322 | /* Get the newly created channel reference back */ | |
1323 | uchan = trace_ust_find_channel_by_name( | |
1324 | usess->domain_global.channels, channel_name); | |
1325 | assert(uchan); | |
1326 | } | |
1327 | ||
1328 | /* At this point, the session and channel exist on the tracer */ | |
7972aab2 | 1329 | ret = event_ust_enable_tracepoint(usess, uchan, event, filter); |
f73fabfd | 1330 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1331 | goto error; |
1332 | } | |
1333 | break; | |
1334 | } | |
1335 | #if 0 | |
1336 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
1337 | case LTTNG_DOMAIN_UST_PID: | |
1338 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
1339 | #endif | |
1340 | default: | |
f73fabfd | 1341 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1342 | goto error; |
1343 | } | |
1344 | ||
f73fabfd | 1345 | ret = LTTNG_OK; |
2f77fc4b DG |
1346 | |
1347 | error: | |
2223c96f | 1348 | rcu_read_unlock(); |
2f77fc4b DG |
1349 | return ret; |
1350 | } | |
1351 | ||
1352 | /* | |
1353 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
1354 | */ | |
7972aab2 DG |
1355 | int cmd_enable_event_all(struct ltt_session *session, |
1356 | struct lttng_domain *domain, char *channel_name, int event_type, | |
025faf73 | 1357 | struct lttng_filter_bytecode *filter, int wpipe) |
2f77fc4b DG |
1358 | { |
1359 | int ret; | |
1360 | struct lttng_channel *attr; | |
1361 | ||
1362 | assert(session); | |
1363 | assert(channel_name); | |
1364 | ||
2223c96f DG |
1365 | rcu_read_lock(); |
1366 | ||
7972aab2 | 1367 | switch (domain->type) { |
2f77fc4b DG |
1368 | case LTTNG_DOMAIN_KERNEL: |
1369 | { | |
1370 | struct ltt_kernel_channel *kchan; | |
1371 | ||
1372 | assert(session->kernel_session); | |
1373 | ||
85076754 MD |
1374 | /* |
1375 | * If a non-default channel has been created in the | |
1376 | * session, explicitely require that -c chan_name needs | |
1377 | * to be provided. | |
1378 | */ | |
1379 | if (session->kernel_session->has_non_default_channel | |
1380 | && channel_name[0] == '\0') { | |
1381 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1382 | goto error; | |
1383 | } | |
1384 | ||
2f77fc4b DG |
1385 | kchan = trace_kernel_get_channel_by_name(channel_name, |
1386 | session->kernel_session); | |
1387 | if (kchan == NULL) { | |
1388 | /* Create default channel */ | |
0a9c6494 DG |
1389 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
1390 | LTTNG_BUFFER_GLOBAL); | |
2f77fc4b | 1391 | if (attr == NULL) { |
f73fabfd | 1392 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1393 | goto error; |
1394 | } | |
1395 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1396 | ||
1397 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1398 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1399 | free(attr); |
1400 | goto error; | |
1401 | } | |
1402 | free(attr); | |
1403 | ||
1404 | /* Get the newly created kernel channel pointer */ | |
1405 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1406 | session->kernel_session); | |
1407 | assert(kchan); | |
1408 | } | |
1409 | ||
1410 | switch (event_type) { | |
1411 | case LTTNG_EVENT_SYSCALL: | |
d3a56674 | 1412 | ret = event_kernel_enable_all_syscalls(kchan, kernel_tracer_fd); |
2f77fc4b DG |
1413 | break; |
1414 | case LTTNG_EVENT_TRACEPOINT: | |
1415 | /* | |
1416 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and | |
1417 | * events already registered to the channel. | |
1418 | */ | |
d3a56674 | 1419 | ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd); |
2f77fc4b DG |
1420 | break; |
1421 | case LTTNG_EVENT_ALL: | |
1422 | /* Enable syscalls and tracepoints */ | |
d3a56674 | 1423 | ret = event_kernel_enable_all(kchan, kernel_tracer_fd); |
2f77fc4b DG |
1424 | break; |
1425 | default: | |
f73fabfd | 1426 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
2f77fc4b DG |
1427 | goto error; |
1428 | } | |
1429 | ||
1430 | /* Manage return value */ | |
f73fabfd | 1431 | if (ret != LTTNG_OK) { |
e5f5db7f DG |
1432 | /* |
1433 | * On error, cmd_enable_channel call will take care of destroying | |
1434 | * the created channel if it was needed. | |
1435 | */ | |
2f77fc4b DG |
1436 | goto error; |
1437 | } | |
1438 | ||
1439 | kernel_wait_quiescent(kernel_tracer_fd); | |
1440 | break; | |
1441 | } | |
1442 | case LTTNG_DOMAIN_UST: | |
1443 | { | |
1444 | struct ltt_ust_channel *uchan; | |
1445 | struct ltt_ust_session *usess = session->ust_session; | |
1446 | ||
1447 | assert(usess); | |
1448 | ||
85076754 MD |
1449 | /* |
1450 | * If a non-default channel has been created in the | |
1451 | * session, explicitely require that -c chan_name needs | |
1452 | * to be provided. | |
1453 | */ | |
1454 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1455 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1456 | goto error; | |
1457 | } | |
1458 | ||
2f77fc4b DG |
1459 | /* Get channel from global UST domain */ |
1460 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
1461 | channel_name); | |
1462 | if (uchan == NULL) { | |
1463 | /* Create default channel */ | |
0a9c6494 DG |
1464 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
1465 | usess->buffer_type); | |
2f77fc4b | 1466 | if (attr == NULL) { |
f73fabfd | 1467 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1468 | goto error; |
1469 | } | |
1470 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1471 | ||
1472 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1473 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1474 | free(attr); |
1475 | goto error; | |
1476 | } | |
1477 | free(attr); | |
1478 | ||
1479 | /* Get the newly created channel reference back */ | |
1480 | uchan = trace_ust_find_channel_by_name( | |
1481 | usess->domain_global.channels, channel_name); | |
1482 | assert(uchan); | |
1483 | } | |
1484 | ||
1485 | /* At this point, the session and channel exist on the tracer */ | |
1486 | ||
1487 | switch (event_type) { | |
1488 | case LTTNG_EVENT_ALL: | |
1489 | case LTTNG_EVENT_TRACEPOINT: | |
7972aab2 | 1490 | ret = event_ust_enable_all_tracepoints(usess, uchan, filter); |
f73fabfd | 1491 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1492 | goto error; |
1493 | } | |
1494 | break; | |
1495 | default: | |
f73fabfd | 1496 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
2f77fc4b DG |
1497 | goto error; |
1498 | } | |
1499 | ||
1500 | /* Manage return value */ | |
f73fabfd | 1501 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1502 | goto error; |
1503 | } | |
1504 | ||
1505 | break; | |
1506 | } | |
1507 | #if 0 | |
1508 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
1509 | case LTTNG_DOMAIN_UST_PID: | |
1510 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
1511 | #endif | |
1512 | default: | |
f73fabfd | 1513 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1514 | goto error; |
1515 | } | |
1516 | ||
f73fabfd | 1517 | ret = LTTNG_OK; |
2f77fc4b DG |
1518 | |
1519 | error: | |
2223c96f | 1520 | rcu_read_unlock(); |
2f77fc4b DG |
1521 | return ret; |
1522 | } | |
1523 | ||
1524 | ||
1525 | /* | |
1526 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
1527 | */ | |
1528 | ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
1529 | { | |
1530 | int ret; | |
1531 | ssize_t nb_events = 0; | |
1532 | ||
1533 | switch (domain) { | |
1534 | case LTTNG_DOMAIN_KERNEL: | |
1535 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
1536 | if (nb_events < 0) { | |
f73fabfd | 1537 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
2f77fc4b DG |
1538 | goto error; |
1539 | } | |
1540 | break; | |
1541 | case LTTNG_DOMAIN_UST: | |
1542 | nb_events = ust_app_list_events(events); | |
1543 | if (nb_events < 0) { | |
f73fabfd | 1544 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
1545 | goto error; |
1546 | } | |
1547 | break; | |
1548 | default: | |
f73fabfd | 1549 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1550 | goto error; |
1551 | } | |
1552 | ||
1553 | return nb_events; | |
1554 | ||
1555 | error: | |
1556 | /* Return negative value to differentiate return code */ | |
1557 | return -ret; | |
1558 | } | |
1559 | ||
1560 | /* | |
1561 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
1562 | */ | |
1563 | ssize_t cmd_list_tracepoint_fields(int domain, | |
1564 | struct lttng_event_field **fields) | |
1565 | { | |
1566 | int ret; | |
1567 | ssize_t nb_fields = 0; | |
1568 | ||
1569 | switch (domain) { | |
1570 | case LTTNG_DOMAIN_UST: | |
1571 | nb_fields = ust_app_list_event_fields(fields); | |
1572 | if (nb_fields < 0) { | |
f73fabfd | 1573 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
1574 | goto error; |
1575 | } | |
1576 | break; | |
1577 | case LTTNG_DOMAIN_KERNEL: | |
1578 | default: /* fall-through */ | |
f73fabfd | 1579 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1580 | goto error; |
1581 | } | |
1582 | ||
1583 | return nb_fields; | |
1584 | ||
1585 | error: | |
1586 | /* Return negative value to differentiate return code */ | |
1587 | return -ret; | |
1588 | } | |
1589 | ||
1590 | /* | |
1591 | * Command LTTNG_START_TRACE processed by the client thread. | |
1592 | */ | |
1593 | int cmd_start_trace(struct ltt_session *session) | |
1594 | { | |
1595 | int ret; | |
1148bd3a | 1596 | unsigned long nb_chan = 0; |
2f77fc4b DG |
1597 | struct ltt_kernel_session *ksession; |
1598 | struct ltt_ust_session *usess; | |
2f77fc4b DG |
1599 | |
1600 | assert(session); | |
1601 | ||
1602 | /* Ease our life a bit ;) */ | |
1603 | ksession = session->kernel_session; | |
1604 | usess = session->ust_session; | |
1605 | ||
1606 | if (session->enabled) { | |
1607 | /* Already started. */ | |
f73fabfd | 1608 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
1609 | goto error; |
1610 | } | |
1611 | ||
1148bd3a DG |
1612 | /* |
1613 | * Starting a session without channel is useless since after that it's not | |
1614 | * possible to enable channel thus inform the client. | |
1615 | */ | |
1616 | if (usess && usess->domain_global.channels) { | |
1617 | nb_chan += lttng_ht_get_count(usess->domain_global.channels); | |
1618 | } | |
1619 | if (ksession) { | |
1620 | nb_chan += ksession->channel_count; | |
1621 | } | |
1622 | if (!nb_chan) { | |
1623 | ret = LTTNG_ERR_NO_CHANNEL; | |
1624 | goto error; | |
1625 | } | |
1626 | ||
2f77fc4b DG |
1627 | session->enabled = 1; |
1628 | ||
2f77fc4b DG |
1629 | /* Kernel tracing */ |
1630 | if (ksession != NULL) { | |
9b6c7ec5 DG |
1631 | ret = start_kernel_session(ksession, kernel_tracer_fd); |
1632 | if (ret != LTTNG_OK) { | |
2f77fc4b DG |
1633 | goto error; |
1634 | } | |
2f77fc4b DG |
1635 | } |
1636 | ||
1637 | /* Flag session that trace should start automatically */ | |
1638 | if (usess) { | |
1639 | usess->start_trace = 1; | |
1640 | ||
1641 | ret = ust_app_start_trace_all(usess); | |
1642 | if (ret < 0) { | |
f73fabfd | 1643 | ret = LTTNG_ERR_UST_START_FAIL; |
2f77fc4b DG |
1644 | goto error; |
1645 | } | |
1646 | } | |
1647 | ||
9b6c7ec5 DG |
1648 | session->started = 1; |
1649 | ||
f73fabfd | 1650 | ret = LTTNG_OK; |
2f77fc4b DG |
1651 | |
1652 | error: | |
1653 | return ret; | |
1654 | } | |
1655 | ||
1656 | /* | |
1657 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
1658 | */ | |
1659 | int cmd_stop_trace(struct ltt_session *session) | |
1660 | { | |
1661 | int ret; | |
1662 | struct ltt_kernel_channel *kchan; | |
1663 | struct ltt_kernel_session *ksession; | |
1664 | struct ltt_ust_session *usess; | |
1665 | ||
1666 | assert(session); | |
1667 | ||
1668 | /* Short cut */ | |
1669 | ksession = session->kernel_session; | |
1670 | usess = session->ust_session; | |
1671 | ||
1672 | if (!session->enabled) { | |
f73fabfd | 1673 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
2f77fc4b DG |
1674 | goto error; |
1675 | } | |
1676 | ||
1677 | session->enabled = 0; | |
1678 | ||
1679 | /* Kernel tracer */ | |
d39829a1 | 1680 | if (ksession && ksession->started) { |
2f77fc4b DG |
1681 | DBG("Stop kernel tracing"); |
1682 | ||
1683 | /* Flush metadata if exist */ | |
1684 | if (ksession->metadata_stream_fd >= 0) { | |
1685 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
1686 | if (ret < 0) { | |
1687 | ERR("Kernel metadata flush failed"); | |
1688 | } | |
1689 | } | |
1690 | ||
1691 | /* Flush all buffers before stopping */ | |
1692 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
1693 | ret = kernel_flush_buffer(kchan); | |
1694 | if (ret < 0) { | |
1695 | ERR("Kernel flush buffer error"); | |
1696 | } | |
1697 | } | |
1698 | ||
1699 | ret = kernel_stop_session(ksession); | |
1700 | if (ret < 0) { | |
f73fabfd | 1701 | ret = LTTNG_ERR_KERN_STOP_FAIL; |
2f77fc4b DG |
1702 | goto error; |
1703 | } | |
1704 | ||
1705 | kernel_wait_quiescent(kernel_tracer_fd); | |
9b6c7ec5 DG |
1706 | |
1707 | ksession->started = 0; | |
2f77fc4b DG |
1708 | } |
1709 | ||
d39829a1 | 1710 | if (usess && usess->start_trace) { |
2f77fc4b DG |
1711 | usess->start_trace = 0; |
1712 | ||
1713 | ret = ust_app_stop_trace_all(usess); | |
1714 | if (ret < 0) { | |
f73fabfd | 1715 | ret = LTTNG_ERR_UST_STOP_FAIL; |
2f77fc4b DG |
1716 | goto error; |
1717 | } | |
1718 | } | |
1719 | ||
f73fabfd | 1720 | ret = LTTNG_OK; |
2f77fc4b DG |
1721 | |
1722 | error: | |
1723 | return ret; | |
1724 | } | |
1725 | ||
1726 | /* | |
1727 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
1728 | */ | |
1729 | int cmd_set_consumer_uri(int domain, struct ltt_session *session, | |
1730 | size_t nb_uri, struct lttng_uri *uris) | |
1731 | { | |
1732 | int ret, i; | |
1733 | struct ltt_kernel_session *ksess = session->kernel_session; | |
1734 | struct ltt_ust_session *usess = session->ust_session; | |
1735 | struct consumer_output *consumer = NULL; | |
1736 | ||
1737 | assert(session); | |
1738 | assert(uris); | |
1739 | assert(nb_uri > 0); | |
1740 | ||
1741 | /* Can't enable consumer after session started. */ | |
1742 | if (session->enabled) { | |
f73fabfd | 1743 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
1744 | goto error; |
1745 | } | |
1746 | ||
2f77fc4b DG |
1747 | /* |
1748 | * This case switch makes sure the domain session has a temporary consumer | |
1749 | * so the URL can be set. | |
1750 | */ | |
1751 | switch (domain) { | |
1752 | case 0: | |
1753 | /* Code flow error. A session MUST always have a consumer object */ | |
1754 | assert(session->consumer); | |
1755 | /* | |
1756 | * The URL will be added to the tracing session consumer instead of a | |
1757 | * specific domain consumer. | |
1758 | */ | |
1759 | consumer = session->consumer; | |
1760 | break; | |
1761 | case LTTNG_DOMAIN_KERNEL: | |
1762 | /* Code flow error if we don't have a kernel session here. */ | |
1763 | assert(ksess); | |
785d2d0d DG |
1764 | assert(ksess->consumer); |
1765 | consumer = ksess->consumer; | |
2f77fc4b DG |
1766 | break; |
1767 | case LTTNG_DOMAIN_UST: | |
1768 | /* Code flow error if we don't have a kernel session here. */ | |
1769 | assert(usess); | |
785d2d0d DG |
1770 | assert(usess->consumer); |
1771 | consumer = usess->consumer; | |
2f77fc4b DG |
1772 | break; |
1773 | } | |
1774 | ||
1775 | for (i = 0; i < nb_uri; i++) { | |
2f77fc4b | 1776 | ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name); |
a74934ba | 1777 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1778 | goto error; |
1779 | } | |
2f77fc4b DG |
1780 | } |
1781 | ||
1782 | /* All good! */ | |
f73fabfd | 1783 | ret = LTTNG_OK; |
2f77fc4b DG |
1784 | |
1785 | error: | |
1786 | return ret; | |
1787 | } | |
1788 | ||
1789 | /* | |
1790 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
1791 | */ | |
1792 | int cmd_create_session_uri(char *name, struct lttng_uri *uris, | |
1793 | size_t nb_uri, lttng_sock_cred *creds) | |
1794 | { | |
1795 | int ret; | |
2f77fc4b DG |
1796 | struct ltt_session *session; |
1797 | ||
1798 | assert(name); | |
2bba9e53 | 1799 | assert(creds); |
785d2d0d | 1800 | |
2f77fc4b DG |
1801 | /* |
1802 | * Verify if the session already exist | |
1803 | * | |
1804 | * XXX: There is no need for the session lock list here since the caller | |
1805 | * (process_client_msg) is holding it. We might want to change that so a | |
1806 | * single command does not lock the entire session list. | |
1807 | */ | |
1808 | session = session_find_by_name(name); | |
1809 | if (session != NULL) { | |
f73fabfd | 1810 | ret = LTTNG_ERR_EXIST_SESS; |
2f77fc4b DG |
1811 | goto find_error; |
1812 | } | |
1813 | ||
1814 | /* Create tracing session in the registry */ | |
dec56f6c | 1815 | ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds), |
2f77fc4b | 1816 | LTTNG_SOCK_GET_GID_CRED(creds)); |
f73fabfd | 1817 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1818 | goto session_error; |
1819 | } | |
1820 | ||
1821 | /* | |
1822 | * Get the newly created session pointer back | |
1823 | * | |
1824 | * XXX: There is no need for the session lock list here since the caller | |
1825 | * (process_client_msg) is holding it. We might want to change that so a | |
1826 | * single command does not lock the entire session list. | |
1827 | */ | |
1828 | session = session_find_by_name(name); | |
1829 | assert(session); | |
1830 | ||
1831 | /* Create default consumer output for the session not yet created. */ | |
1832 | session->consumer = consumer_create_output(CONSUMER_DST_LOCAL); | |
1833 | if (session->consumer == NULL) { | |
f73fabfd | 1834 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1835 | goto consumer_error; |
1836 | } | |
1837 | ||
2bba9e53 DG |
1838 | if (uris) { |
1839 | ret = cmd_set_consumer_uri(0, session, nb_uri, uris); | |
1840 | if (ret != LTTNG_OK) { | |
1841 | goto consumer_error; | |
1842 | } | |
1843 | session->output_traces = 1; | |
1844 | } else { | |
1845 | session->output_traces = 0; | |
1846 | DBG2("Session %s created with no output", session->name); | |
2f77fc4b DG |
1847 | } |
1848 | ||
1849 | session->consumer->enabled = 1; | |
1850 | ||
f73fabfd | 1851 | return LTTNG_OK; |
2f77fc4b DG |
1852 | |
1853 | consumer_error: | |
1854 | session_destroy(session); | |
1855 | session_error: | |
1856 | find_error: | |
1857 | return ret; | |
1858 | } | |
1859 | ||
27babd3a DG |
1860 | /* |
1861 | * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread. | |
1862 | */ | |
1863 | int cmd_create_session_snapshot(char *name, struct lttng_uri *uris, | |
1864 | size_t nb_uri, lttng_sock_cred *creds) | |
1865 | { | |
1866 | int ret; | |
1867 | struct ltt_session *session; | |
1868 | struct snapshot_output *new_output = NULL; | |
1869 | ||
1870 | assert(name); | |
1871 | assert(creds); | |
1872 | ||
1873 | /* | |
1874 | * Create session in no output mode with URIs set to NULL. The uris we've | |
1875 | * received are for a default snapshot output if one. | |
1876 | */ | |
1877 | ret = cmd_create_session_uri(name, NULL, 0, creds); | |
1878 | if (ret != LTTNG_OK) { | |
1879 | goto error; | |
1880 | } | |
1881 | ||
1882 | /* Get the newly created session pointer back. This should NEVER fail. */ | |
1883 | session = session_find_by_name(name); | |
1884 | assert(session); | |
1885 | ||
1886 | /* Flag session for snapshot mode. */ | |
1887 | session->snapshot_mode = 1; | |
1888 | ||
1889 | /* Skip snapshot output creation if no URI is given. */ | |
1890 | if (nb_uri == 0) { | |
1891 | goto end; | |
1892 | } | |
1893 | ||
1894 | new_output = snapshot_output_alloc(); | |
1895 | if (!new_output) { | |
1896 | ret = LTTNG_ERR_NOMEM; | |
1897 | goto error_snapshot_alloc; | |
1898 | } | |
1899 | ||
1900 | ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL, | |
1901 | uris, nb_uri, session->consumer, new_output, &session->snapshot); | |
1902 | if (ret < 0) { | |
1903 | if (ret == -ENOMEM) { | |
1904 | ret = LTTNG_ERR_NOMEM; | |
1905 | } else { | |
1906 | ret = LTTNG_ERR_INVALID; | |
1907 | } | |
1908 | goto error_snapshot; | |
1909 | } | |
1910 | ||
1911 | rcu_read_lock(); | |
1912 | snapshot_add_output(&session->snapshot, new_output); | |
1913 | rcu_read_unlock(); | |
1914 | ||
1915 | end: | |
1916 | return LTTNG_OK; | |
1917 | ||
1918 | error_snapshot: | |
1919 | snapshot_output_destroy(new_output); | |
1920 | error_snapshot_alloc: | |
1921 | session_destroy(session); | |
1922 | error: | |
1923 | return ret; | |
1924 | } | |
1925 | ||
2f77fc4b DG |
1926 | /* |
1927 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
1928 | */ | |
1929 | int cmd_destroy_session(struct ltt_session *session, int wpipe) | |
1930 | { | |
1931 | int ret; | |
1932 | struct ltt_ust_session *usess; | |
1933 | struct ltt_kernel_session *ksess; | |
1934 | ||
1935 | /* Safety net */ | |
1936 | assert(session); | |
1937 | ||
1938 | usess = session->ust_session; | |
1939 | ksess = session->kernel_session; | |
1940 | ||
1941 | /* Clean kernel session teardown */ | |
1942 | kernel_destroy_session(ksess); | |
1943 | ||
1944 | /* UST session teardown */ | |
1945 | if (usess) { | |
1946 | /* Close any relayd session */ | |
1947 | consumer_output_send_destroy_relayd(usess->consumer); | |
1948 | ||
1949 | /* Destroy every UST application related to this session. */ | |
1950 | ret = ust_app_destroy_trace_all(usess); | |
1951 | if (ret) { | |
1952 | ERR("Error in ust_app_destroy_trace_all"); | |
1953 | } | |
1954 | ||
1955 | /* Clean up the rest. */ | |
1956 | trace_ust_destroy_session(usess); | |
1957 | } | |
1958 | ||
1959 | /* | |
1960 | * Must notify the kernel thread here to update it's poll set in order to | |
1961 | * remove the channel(s)' fd just destroyed. | |
1962 | */ | |
1963 | ret = notify_thread_pipe(wpipe); | |
1964 | if (ret < 0) { | |
1965 | PERROR("write kernel poll pipe"); | |
1966 | } | |
1967 | ||
1968 | ret = session_destroy(session); | |
1969 | ||
1970 | return ret; | |
1971 | } | |
1972 | ||
1973 | /* | |
1974 | * Command LTTNG_CALIBRATE processed by the client thread. | |
1975 | */ | |
1976 | int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
1977 | { | |
1978 | int ret; | |
1979 | ||
1980 | switch (domain) { | |
1981 | case LTTNG_DOMAIN_KERNEL: | |
1982 | { | |
1983 | struct lttng_kernel_calibrate kcalibrate; | |
1984 | ||
72b6f5b6 DG |
1985 | switch (calibrate->type) { |
1986 | case LTTNG_CALIBRATE_FUNCTION: | |
1987 | default: | |
1988 | /* Default and only possible calibrate option. */ | |
1989 | kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE; | |
1990 | break; | |
1991 | } | |
1992 | ||
2f77fc4b DG |
1993 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); |
1994 | if (ret < 0) { | |
f73fabfd | 1995 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
2f77fc4b DG |
1996 | goto error; |
1997 | } | |
1998 | break; | |
1999 | } | |
2000 | case LTTNG_DOMAIN_UST: | |
2001 | { | |
2002 | struct lttng_ust_calibrate ucalibrate; | |
2003 | ||
72b6f5b6 DG |
2004 | switch (calibrate->type) { |
2005 | case LTTNG_CALIBRATE_FUNCTION: | |
2006 | default: | |
2007 | /* Default and only possible calibrate option. */ | |
2008 | ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT; | |
2009 | break; | |
2010 | } | |
2011 | ||
2f77fc4b DG |
2012 | ret = ust_app_calibrate_glb(&ucalibrate); |
2013 | if (ret < 0) { | |
f73fabfd | 2014 | ret = LTTNG_ERR_UST_CALIBRATE_FAIL; |
2f77fc4b DG |
2015 | goto error; |
2016 | } | |
2017 | break; | |
2018 | } | |
2019 | default: | |
f73fabfd | 2020 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2021 | goto error; |
2022 | } | |
2023 | ||
f73fabfd | 2024 | ret = LTTNG_OK; |
2f77fc4b DG |
2025 | |
2026 | error: | |
2027 | return ret; | |
2028 | } | |
2029 | ||
2030 | /* | |
2031 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
2032 | */ | |
2033 | int cmd_register_consumer(struct ltt_session *session, int domain, | |
2034 | const char *sock_path, struct consumer_data *cdata) | |
2035 | { | |
2036 | int ret, sock; | |
dd81b457 | 2037 | struct consumer_socket *socket = NULL; |
2f77fc4b DG |
2038 | |
2039 | assert(session); | |
2040 | assert(cdata); | |
2041 | assert(sock_path); | |
2042 | ||
2043 | switch (domain) { | |
2044 | case LTTNG_DOMAIN_KERNEL: | |
2045 | { | |
2046 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2047 | ||
2048 | assert(ksess); | |
2049 | ||
2050 | /* Can't register a consumer if there is already one */ | |
2051 | if (ksess->consumer_fds_sent != 0) { | |
f73fabfd | 2052 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
2053 | goto error; |
2054 | } | |
2055 | ||
2056 | sock = lttcomm_connect_unix_sock(sock_path); | |
2057 | if (sock < 0) { | |
f73fabfd | 2058 | ret = LTTNG_ERR_CONNECT_FAIL; |
2f77fc4b DG |
2059 | goto error; |
2060 | } | |
4ce514c4 | 2061 | cdata->cmd_sock = sock; |
2f77fc4b | 2062 | |
4ce514c4 | 2063 | socket = consumer_allocate_socket(&cdata->cmd_sock); |
2f77fc4b | 2064 | if (socket == NULL) { |
f66c074c DG |
2065 | ret = close(sock); |
2066 | if (ret < 0) { | |
2067 | PERROR("close register consumer"); | |
2068 | } | |
4ce514c4 | 2069 | cdata->cmd_sock = -1; |
f73fabfd | 2070 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2071 | goto error; |
2072 | } | |
2073 | ||
2074 | socket->lock = zmalloc(sizeof(pthread_mutex_t)); | |
2075 | if (socket->lock == NULL) { | |
2076 | PERROR("zmalloc pthread mutex"); | |
f73fabfd | 2077 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2078 | goto error; |
2079 | } | |
2080 | pthread_mutex_init(socket->lock, NULL); | |
2081 | socket->registered = 1; | |
2082 | ||
2083 | rcu_read_lock(); | |
2084 | consumer_add_socket(socket, ksess->consumer); | |
2085 | rcu_read_unlock(); | |
2086 | ||
2087 | pthread_mutex_lock(&cdata->pid_mutex); | |
2088 | cdata->pid = -1; | |
2089 | pthread_mutex_unlock(&cdata->pid_mutex); | |
2090 | ||
2091 | break; | |
2092 | } | |
2093 | default: | |
2094 | /* TODO: Userspace tracing */ | |
f73fabfd | 2095 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2096 | goto error; |
2097 | } | |
2098 | ||
dd81b457 | 2099 | return LTTNG_OK; |
2f77fc4b DG |
2100 | |
2101 | error: | |
dd81b457 DG |
2102 | if (socket) { |
2103 | consumer_destroy_socket(socket); | |
2104 | } | |
2f77fc4b DG |
2105 | return ret; |
2106 | } | |
2107 | ||
2108 | /* | |
2109 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
2110 | */ | |
2111 | ssize_t cmd_list_domains(struct ltt_session *session, | |
2112 | struct lttng_domain **domains) | |
2113 | { | |
2114 | int ret, index = 0; | |
2115 | ssize_t nb_dom = 0; | |
2116 | ||
2117 | if (session->kernel_session != NULL) { | |
2118 | DBG3("Listing domains found kernel domain"); | |
2119 | nb_dom++; | |
2120 | } | |
2121 | ||
2122 | if (session->ust_session != NULL) { | |
2123 | DBG3("Listing domains found UST global domain"); | |
2124 | nb_dom++; | |
2125 | } | |
2126 | ||
2127 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); | |
2128 | if (*domains == NULL) { | |
f73fabfd | 2129 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2130 | goto error; |
2131 | } | |
2132 | ||
2133 | if (session->kernel_session != NULL) { | |
2134 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
2135 | index++; | |
2136 | } | |
2137 | ||
2138 | if (session->ust_session != NULL) { | |
2139 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
88c5f0d8 | 2140 | (*domains)[index].buf_type = session->ust_session->buffer_type; |
2f77fc4b DG |
2141 | index++; |
2142 | } | |
2143 | ||
2144 | return nb_dom; | |
2145 | ||
2146 | error: | |
f73fabfd DG |
2147 | /* Return negative value to differentiate return code */ |
2148 | return -ret; | |
2f77fc4b DG |
2149 | } |
2150 | ||
2151 | ||
2152 | /* | |
2153 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
2154 | */ | |
2155 | ssize_t cmd_list_channels(int domain, struct ltt_session *session, | |
2156 | struct lttng_channel **channels) | |
2157 | { | |
2158 | int ret; | |
2159 | ssize_t nb_chan = 0; | |
2160 | ||
2161 | switch (domain) { | |
2162 | case LTTNG_DOMAIN_KERNEL: | |
2163 | if (session->kernel_session != NULL) { | |
2164 | nb_chan = session->kernel_session->channel_count; | |
2165 | } | |
2166 | DBG3("Number of kernel channels %zd", nb_chan); | |
c7d620a2 DG |
2167 | if (nb_chan <= 0) { |
2168 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; | |
2169 | } | |
2f77fc4b DG |
2170 | break; |
2171 | case LTTNG_DOMAIN_UST: | |
2172 | if (session->ust_session != NULL) { | |
2173 | nb_chan = lttng_ht_get_count( | |
2174 | session->ust_session->domain_global.channels); | |
2175 | } | |
2176 | DBG3("Number of UST global channels %zd", nb_chan); | |
c7d620a2 DG |
2177 | if (nb_chan <= 0) { |
2178 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
2179 | } | |
2f77fc4b DG |
2180 | break; |
2181 | default: | |
2182 | *channels = NULL; | |
f73fabfd | 2183 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2184 | goto error; |
2185 | } | |
2186 | ||
2187 | if (nb_chan > 0) { | |
2188 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
2189 | if (*channels == NULL) { | |
f73fabfd | 2190 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2191 | goto error; |
2192 | } | |
2193 | ||
2194 | list_lttng_channels(domain, session, *channels); | |
2195 | } else { | |
2196 | *channels = NULL; | |
c7d620a2 DG |
2197 | /* Ret value was set in the domain switch case */ |
2198 | goto error; | |
2f77fc4b DG |
2199 | } |
2200 | ||
2201 | return nb_chan; | |
2202 | ||
2203 | error: | |
f73fabfd DG |
2204 | /* Return negative value to differentiate return code */ |
2205 | return -ret; | |
2f77fc4b DG |
2206 | } |
2207 | ||
2208 | /* | |
2209 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
2210 | */ | |
2211 | ssize_t cmd_list_events(int domain, struct ltt_session *session, | |
2212 | char *channel_name, struct lttng_event **events) | |
2213 | { | |
2214 | int ret = 0; | |
2215 | ssize_t nb_event = 0; | |
2216 | ||
2217 | switch (domain) { | |
2218 | case LTTNG_DOMAIN_KERNEL: | |
2219 | if (session->kernel_session != NULL) { | |
2220 | nb_event = list_lttng_kernel_events(channel_name, | |
2221 | session->kernel_session, events); | |
2222 | } | |
2223 | break; | |
2224 | case LTTNG_DOMAIN_UST: | |
2225 | { | |
2226 | if (session->ust_session != NULL) { | |
2227 | nb_event = list_lttng_ust_global_events(channel_name, | |
2228 | &session->ust_session->domain_global, events); | |
2229 | } | |
2230 | break; | |
2231 | } | |
2232 | default: | |
f73fabfd | 2233 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2234 | goto error; |
2235 | } | |
2236 | ||
f73fabfd | 2237 | return nb_event; |
2f77fc4b DG |
2238 | |
2239 | error: | |
f73fabfd DG |
2240 | /* Return negative value to differentiate return code */ |
2241 | return -ret; | |
2f77fc4b DG |
2242 | } |
2243 | ||
2244 | /* | |
2245 | * Using the session list, filled a lttng_session array to send back to the | |
2246 | * client for session listing. | |
2247 | * | |
2248 | * The session list lock MUST be acquired before calling this function. Use | |
2249 | * session_lock_list() and session_unlock_list(). | |
2250 | */ | |
2251 | void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid, | |
2252 | gid_t gid) | |
2253 | { | |
2254 | int ret; | |
2255 | unsigned int i = 0; | |
2256 | struct ltt_session *session; | |
2257 | struct ltt_session_list *list = session_get_list(); | |
2258 | ||
2259 | DBG("Getting all available session for UID %d GID %d", | |
2260 | uid, gid); | |
2261 | /* | |
2262 | * Iterate over session list and append data after the control struct in | |
2263 | * the buffer. | |
2264 | */ | |
2265 | cds_list_for_each_entry(session, &list->head, list) { | |
2266 | /* | |
2267 | * Only list the sessions the user can control. | |
2268 | */ | |
2269 | if (!session_access_ok(session, uid, gid)) { | |
2270 | continue; | |
2271 | } | |
2272 | ||
2273 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2274 | struct ltt_ust_session *usess = session->ust_session; | |
2275 | ||
2276 | if (session->consumer->type == CONSUMER_DST_NET || | |
2277 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
2278 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
2279 | ret = build_network_session_path(sessions[i].path, | |
dec56f6c | 2280 | sizeof(sessions[i].path), session); |
2f77fc4b | 2281 | } else { |
dec56f6c | 2282 | ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s", |
2f77fc4b DG |
2283 | session->consumer->dst.trace_path); |
2284 | } | |
2285 | if (ret < 0) { | |
2286 | PERROR("snprintf session path"); | |
2287 | continue; | |
2288 | } | |
2289 | ||
2290 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
2291 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
2292 | sessions[i].enabled = session->enabled; | |
2cbf8fed | 2293 | sessions[i].snapshot_mode = session->snapshot_mode; |
2f77fc4b DG |
2294 | i++; |
2295 | } | |
2296 | } | |
2297 | ||
806e2684 | 2298 | /* |
6d805429 | 2299 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
d3f14b8a | 2300 | * ready for trace analysis (or any kind of reader) or else 1 for pending data. |
806e2684 | 2301 | */ |
6d805429 | 2302 | int cmd_data_pending(struct ltt_session *session) |
806e2684 DG |
2303 | { |
2304 | int ret; | |
2305 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2306 | struct ltt_ust_session *usess = session->ust_session; | |
2307 | ||
2308 | assert(session); | |
2309 | ||
2310 | /* Session MUST be stopped to ask for data availability. */ | |
2311 | if (session->enabled) { | |
2312 | ret = LTTNG_ERR_SESSION_STARTED; | |
2313 | goto error; | |
2e4e8c2d DG |
2314 | } else { |
2315 | /* | |
2316 | * If stopped, just make sure we've started before else the above call | |
2317 | * will always send that there is data pending. | |
2318 | * | |
2319 | * The consumer assumes that when the data pending command is received, | |
2320 | * the trace has been started before or else no output data is written | |
2321 | * by the streams which is a condition for data pending. So, this is | |
2322 | * *VERY* important that we don't ask the consumer before a start | |
2323 | * trace. | |
2324 | */ | |
2325 | if (!session->started) { | |
2326 | ret = 0; | |
2327 | goto error; | |
2328 | } | |
806e2684 DG |
2329 | } |
2330 | ||
2331 | if (ksess && ksess->consumer) { | |
6d805429 DG |
2332 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
2333 | if (ret == 1) { | |
806e2684 DG |
2334 | /* Data is still being extracted for the kernel. */ |
2335 | goto error; | |
2336 | } | |
2337 | } | |
2338 | ||
2339 | if (usess && usess->consumer) { | |
6d805429 DG |
2340 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
2341 | if (ret == 1) { | |
806e2684 DG |
2342 | /* Data is still being extracted for the kernel. */ |
2343 | goto error; | |
2344 | } | |
2345 | } | |
2346 | ||
2347 | /* Data is ready to be read by a viewer */ | |
6d805429 | 2348 | ret = 0; |
806e2684 DG |
2349 | |
2350 | error: | |
2351 | return ret; | |
2352 | } | |
2353 | ||
6dc3064a DG |
2354 | /* |
2355 | * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library. | |
2356 | * | |
2357 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
2358 | */ | |
2359 | int cmd_snapshot_add_output(struct ltt_session *session, | |
2360 | struct lttng_snapshot_output *output, uint32_t *id) | |
2361 | { | |
2362 | int ret; | |
2363 | struct snapshot_output *new_output; | |
2364 | ||
2365 | assert(session); | |
2366 | assert(output); | |
2367 | ||
2368 | DBG("Cmd snapshot add output for session %s", session->name); | |
2369 | ||
2370 | /* | |
d3f14b8a MD |
2371 | * Permission denied to create an output if the session is not |
2372 | * set in no output mode. | |
6dc3064a DG |
2373 | */ |
2374 | if (session->output_traces) { | |
2375 | ret = LTTNG_ERR_EPERM; | |
2376 | goto error; | |
2377 | } | |
2378 | ||
2379 | /* Only one output is allowed until we have the "tee" feature. */ | |
2380 | if (session->snapshot.nb_output == 1) { | |
2381 | ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST; | |
2382 | goto error; | |
2383 | } | |
2384 | ||
2385 | new_output = snapshot_output_alloc(); | |
2386 | if (!new_output) { | |
2387 | ret = LTTNG_ERR_NOMEM; | |
2388 | goto error; | |
2389 | } | |
2390 | ||
2391 | ret = snapshot_output_init(output->max_size, output->name, | |
2392 | output->ctrl_url, output->data_url, session->consumer, new_output, | |
2393 | &session->snapshot); | |
2394 | if (ret < 0) { | |
2395 | if (ret == -ENOMEM) { | |
2396 | ret = LTTNG_ERR_NOMEM; | |
2397 | } else { | |
2398 | ret = LTTNG_ERR_INVALID; | |
2399 | } | |
2400 | goto free_error; | |
2401 | } | |
2402 | ||
6dc3064a DG |
2403 | rcu_read_lock(); |
2404 | snapshot_add_output(&session->snapshot, new_output); | |
2405 | if (id) { | |
2406 | *id = new_output->id; | |
2407 | } | |
2408 | rcu_read_unlock(); | |
2409 | ||
2410 | return LTTNG_OK; | |
2411 | ||
2412 | free_error: | |
2413 | snapshot_output_destroy(new_output); | |
2414 | error: | |
2415 | return ret; | |
2416 | } | |
2417 | ||
2418 | /* | |
2419 | * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl. | |
2420 | * | |
2421 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
2422 | */ | |
2423 | int cmd_snapshot_del_output(struct ltt_session *session, | |
2424 | struct lttng_snapshot_output *output) | |
2425 | { | |
2426 | int ret; | |
eb240553 | 2427 | struct snapshot_output *sout = NULL; |
6dc3064a DG |
2428 | |
2429 | assert(session); | |
2430 | assert(output); | |
2431 | ||
6dc3064a DG |
2432 | rcu_read_lock(); |
2433 | ||
2434 | /* | |
d3f14b8a MD |
2435 | * Permission denied to create an output if the session is not |
2436 | * set in no output mode. | |
6dc3064a DG |
2437 | */ |
2438 | if (session->output_traces) { | |
2439 | ret = LTTNG_ERR_EPERM; | |
2440 | goto error; | |
2441 | } | |
2442 | ||
eb240553 DG |
2443 | if (output->id) { |
2444 | DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id, | |
2445 | session->name); | |
2446 | sout = snapshot_find_output_by_id(output->id, &session->snapshot); | |
2447 | } else if (*output->name != '\0') { | |
2448 | DBG("Cmd snapshot del output name %s for session %s", output->name, | |
2449 | session->name); | |
2450 | sout = snapshot_find_output_by_name(output->name, &session->snapshot); | |
2451 | } | |
6dc3064a DG |
2452 | if (!sout) { |
2453 | ret = LTTNG_ERR_INVALID; | |
2454 | goto error; | |
2455 | } | |
2456 | ||
2457 | snapshot_delete_output(&session->snapshot, sout); | |
2458 | snapshot_output_destroy(sout); | |
2459 | ret = LTTNG_OK; | |
2460 | ||
2461 | error: | |
2462 | rcu_read_unlock(); | |
2463 | return ret; | |
2464 | } | |
2465 | ||
2466 | /* | |
2467 | * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl. | |
2468 | * | |
2469 | * If no output is available, outputs is untouched and 0 is returned. | |
2470 | * | |
2471 | * Return the size of the newly allocated outputs or a negative LTTNG_ERR code. | |
2472 | */ | |
2473 | ssize_t cmd_snapshot_list_outputs(struct ltt_session *session, | |
2474 | struct lttng_snapshot_output **outputs) | |
2475 | { | |
2476 | int ret, idx = 0; | |
2477 | struct lttng_snapshot_output *list; | |
2478 | struct lttng_ht_iter iter; | |
2479 | struct snapshot_output *output; | |
2480 | ||
2481 | assert(session); | |
2482 | assert(outputs); | |
2483 | ||
2484 | DBG("Cmd snapshot list outputs for session %s", session->name); | |
2485 | ||
2486 | /* | |
d3f14b8a MD |
2487 | * Permission denied to create an output if the session is not |
2488 | * set in no output mode. | |
6dc3064a DG |
2489 | */ |
2490 | if (session->output_traces) { | |
2491 | ret = LTTNG_ERR_EPERM; | |
2492 | goto error; | |
2493 | } | |
2494 | ||
2495 | if (session->snapshot.nb_output == 0) { | |
2496 | ret = 0; | |
2497 | goto error; | |
2498 | } | |
2499 | ||
2500 | list = zmalloc(session->snapshot.nb_output * sizeof(*list)); | |
2501 | if (!list) { | |
2502 | ret = LTTNG_ERR_NOMEM; | |
2503 | goto error; | |
2504 | } | |
2505 | ||
2506 | /* Copy list from session to the new list object. */ | |
2507 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter, | |
2508 | output, node.node) { | |
2509 | assert(output->consumer); | |
2510 | list[idx].id = output->id; | |
2511 | list[idx].max_size = output->max_size; | |
2512 | strncpy(list[idx].name, output->name, sizeof(list[idx].name)); | |
2513 | if (output->consumer->type == CONSUMER_DST_LOCAL) { | |
2514 | strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path, | |
2515 | sizeof(list[idx].ctrl_url)); | |
2516 | } else { | |
2517 | /* Control URI. */ | |
2518 | ret = uri_to_str_url(&output->consumer->dst.net.control, | |
2519 | list[idx].ctrl_url, sizeof(list[idx].ctrl_url)); | |
2520 | if (ret < 0) { | |
2521 | ret = LTTNG_ERR_NOMEM; | |
2522 | goto free_error; | |
2523 | } | |
2524 | ||
2525 | /* Data URI. */ | |
2526 | ret = uri_to_str_url(&output->consumer->dst.net.data, | |
2527 | list[idx].data_url, sizeof(list[idx].data_url)); | |
2528 | if (ret < 0) { | |
2529 | ret = LTTNG_ERR_NOMEM; | |
2530 | goto free_error; | |
2531 | } | |
2532 | } | |
2533 | idx++; | |
2534 | } | |
2535 | ||
2536 | *outputs = list; | |
2537 | return session->snapshot.nb_output; | |
2538 | ||
2539 | free_error: | |
2540 | free(list); | |
2541 | error: | |
2542 | return -ret; | |
2543 | } | |
2544 | ||
2545 | /* | |
2546 | * Send relayd sockets from snapshot output to consumer. Ignore request if the | |
2547 | * snapshot output is *not* set with a remote destination. | |
2548 | * | |
a934f4af | 2549 | * Return 0 on success or a LTTNG_ERR code. |
6dc3064a DG |
2550 | */ |
2551 | static int set_relayd_for_snapshot(struct consumer_output *consumer, | |
2552 | struct snapshot_output *snap_output, struct ltt_session *session) | |
2553 | { | |
a934f4af | 2554 | int ret = LTTNG_OK; |
6dc3064a DG |
2555 | struct lttng_ht_iter iter; |
2556 | struct consumer_socket *socket; | |
2557 | ||
2558 | assert(consumer); | |
2559 | assert(snap_output); | |
2560 | assert(session); | |
2561 | ||
2562 | DBG2("Set relayd object from snapshot output"); | |
2563 | ||
2564 | /* Ignore if snapshot consumer output is not network. */ | |
2565 | if (snap_output->consumer->type != CONSUMER_DST_NET) { | |
2566 | goto error; | |
2567 | } | |
2568 | ||
2569 | /* | |
2570 | * For each consumer socket, create and send the relayd object of the | |
2571 | * snapshot output. | |
2572 | */ | |
2573 | rcu_read_lock(); | |
5eecee74 DG |
2574 | cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter, |
2575 | socket, node.node) { | |
6dc3064a DG |
2576 | ret = send_consumer_relayd_sockets(0, session->id, |
2577 | snap_output->consumer, socket); | |
a934f4af | 2578 | if (ret != LTTNG_OK) { |
6dc3064a DG |
2579 | rcu_read_unlock(); |
2580 | goto error; | |
2581 | } | |
2582 | } | |
2583 | rcu_read_unlock(); | |
2584 | ||
2585 | error: | |
2586 | return ret; | |
2587 | } | |
2588 | ||
2589 | /* | |
2590 | * Record a kernel snapshot. | |
2591 | * | |
a934f4af | 2592 | * Return 0 on success or a LTTNG_ERR code. |
6dc3064a DG |
2593 | */ |
2594 | static int record_kernel_snapshot(struct ltt_kernel_session *ksess, | |
5c786ded JD |
2595 | struct snapshot_output *output, struct ltt_session *session, |
2596 | int wait, int nb_streams) | |
6dc3064a DG |
2597 | { |
2598 | int ret; | |
2599 | ||
2600 | assert(ksess); | |
2601 | assert(output); | |
2602 | assert(session); | |
2603 | ||
10a50311 JD |
2604 | /* Get the datetime for the snapshot output directory. */ |
2605 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime, | |
2606 | sizeof(output->datetime)); | |
2607 | if (!ret) { | |
a934f4af | 2608 | ret = LTTNG_ERR_INVALID; |
10a50311 JD |
2609 | goto error; |
2610 | } | |
2611 | ||
af706bb7 DG |
2612 | /* |
2613 | * Copy kernel session sockets so we can communicate with the right | |
2614 | * consumer for the snapshot record command. | |
2615 | */ | |
2616 | ret = consumer_copy_sockets(output->consumer, ksess->consumer); | |
2617 | if (ret < 0) { | |
a934f4af | 2618 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 2619 | goto error; |
6dc3064a DG |
2620 | } |
2621 | ||
2622 | ret = set_relayd_for_snapshot(ksess->consumer, output, session); | |
a934f4af | 2623 | if (ret != LTTNG_OK) { |
af706bb7 | 2624 | goto error_snapshot; |
6dc3064a DG |
2625 | } |
2626 | ||
5c786ded | 2627 | ret = kernel_snapshot_record(ksess, output, wait, nb_streams); |
2a06df8d | 2628 | if (ret != LTTNG_OK) { |
af706bb7 | 2629 | goto error_snapshot; |
6dc3064a DG |
2630 | } |
2631 | ||
a934f4af DG |
2632 | ret = LTTNG_OK; |
2633 | ||
af706bb7 DG |
2634 | error_snapshot: |
2635 | /* Clean up copied sockets so this output can use some other later on. */ | |
2636 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a DG |
2637 | error: |
2638 | return ret; | |
2639 | } | |
2640 | ||
2641 | /* | |
2642 | * Record a UST snapshot. | |
2643 | * | |
a934f4af | 2644 | * Return 0 on success or a LTTNG_ERR error code. |
6dc3064a DG |
2645 | */ |
2646 | static int record_ust_snapshot(struct ltt_ust_session *usess, | |
5c786ded JD |
2647 | struct snapshot_output *output, struct ltt_session *session, |
2648 | int wait, int nb_streams) | |
6dc3064a DG |
2649 | { |
2650 | int ret; | |
2651 | ||
2652 | assert(usess); | |
2653 | assert(output); | |
2654 | assert(session); | |
2655 | ||
10a50311 JD |
2656 | /* Get the datetime for the snapshot output directory. */ |
2657 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime, | |
2658 | sizeof(output->datetime)); | |
2659 | if (!ret) { | |
a934f4af | 2660 | ret = LTTNG_ERR_INVALID; |
10a50311 JD |
2661 | goto error; |
2662 | } | |
2663 | ||
af706bb7 | 2664 | /* |
d3f14b8a | 2665 | * Copy UST session sockets so we can communicate with the right |
af706bb7 DG |
2666 | * consumer for the snapshot record command. |
2667 | */ | |
2668 | ret = consumer_copy_sockets(output->consumer, usess->consumer); | |
2669 | if (ret < 0) { | |
a934f4af | 2670 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 2671 | goto error; |
6dc3064a DG |
2672 | } |
2673 | ||
2674 | ret = set_relayd_for_snapshot(usess->consumer, output, session); | |
a934f4af | 2675 | if (ret != LTTNG_OK) { |
af706bb7 | 2676 | goto error_snapshot; |
6dc3064a DG |
2677 | } |
2678 | ||
5c786ded | 2679 | ret = ust_app_snapshot_record(usess, output, wait, nb_streams); |
6dc3064a | 2680 | if (ret < 0) { |
e9accd4f DG |
2681 | switch (-ret) { |
2682 | case EINVAL: | |
a934f4af | 2683 | ret = LTTNG_ERR_INVALID; |
e9accd4f DG |
2684 | break; |
2685 | case ENODATA: | |
2686 | ret = LTTNG_ERR_SNAPSHOT_NODATA; | |
2687 | break; | |
2688 | default: | |
2689 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
2690 | break; | |
5c786ded | 2691 | } |
af706bb7 | 2692 | goto error_snapshot; |
6dc3064a DG |
2693 | } |
2694 | ||
a934f4af DG |
2695 | ret = LTTNG_OK; |
2696 | ||
af706bb7 DG |
2697 | error_snapshot: |
2698 | /* Clean up copied sockets so this output can use some other later on. */ | |
2699 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a DG |
2700 | error: |
2701 | return ret; | |
2702 | } | |
2703 | ||
5c786ded JD |
2704 | /* |
2705 | * Returns the total number of streams for a session or a negative value | |
2706 | * on error. | |
2707 | */ | |
2708 | static unsigned int get_total_nb_stream(struct ltt_session *session) | |
2709 | { | |
2710 | unsigned int total_streams = 0; | |
2711 | ||
2712 | if (session->kernel_session) { | |
2713 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2714 | ||
2715 | total_streams += ksess->stream_count_global; | |
2716 | } | |
2717 | ||
2718 | if (session->ust_session) { | |
2719 | struct ltt_ust_session *usess = session->ust_session; | |
2720 | ||
2721 | total_streams += ust_app_get_nb_stream(usess); | |
2722 | } | |
2723 | ||
2724 | return total_streams; | |
2725 | } | |
2726 | ||
6dc3064a DG |
2727 | /* |
2728 | * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl. | |
2729 | * | |
2730 | * The wait parameter is ignored so this call always wait for the snapshot to | |
2731 | * complete before returning. | |
2732 | * | |
2733 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
2734 | */ | |
2735 | int cmd_snapshot_record(struct ltt_session *session, | |
2736 | struct lttng_snapshot_output *output, int wait) | |
2737 | { | |
2738 | int ret = LTTNG_OK; | |
e1986656 DG |
2739 | unsigned int use_tmp_output = 0; |
2740 | struct snapshot_output tmp_output; | |
1bfe7328 | 2741 | unsigned int nb_streams, snapshot_success = 0; |
6dc3064a DG |
2742 | |
2743 | assert(session); | |
2744 | ||
2745 | DBG("Cmd snapshot record for session %s", session->name); | |
2746 | ||
2747 | /* | |
d3f14b8a MD |
2748 | * Permission denied to create an output if the session is not |
2749 | * set in no output mode. | |
6dc3064a DG |
2750 | */ |
2751 | if (session->output_traces) { | |
2752 | ret = LTTNG_ERR_EPERM; | |
2753 | goto error; | |
2754 | } | |
2755 | ||
2756 | /* The session needs to be started at least once. */ | |
2757 | if (!session->started) { | |
2758 | ret = LTTNG_ERR_START_SESSION_ONCE; | |
2759 | goto error; | |
2760 | } | |
2761 | ||
2762 | /* Use temporary output for the session. */ | |
2763 | if (output && *output->ctrl_url != '\0') { | |
6dc3064a DG |
2764 | ret = snapshot_output_init(output->max_size, output->name, |
2765 | output->ctrl_url, output->data_url, session->consumer, | |
e1986656 | 2766 | &tmp_output, NULL); |
6dc3064a DG |
2767 | if (ret < 0) { |
2768 | if (ret == -ENOMEM) { | |
2769 | ret = LTTNG_ERR_NOMEM; | |
2770 | } else { | |
2771 | ret = LTTNG_ERR_INVALID; | |
2772 | } | |
2773 | goto error; | |
2774 | } | |
1bfe7328 DG |
2775 | /* Use the global session count for the temporary snapshot. */ |
2776 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; | |
e1986656 | 2777 | use_tmp_output = 1; |
6dc3064a DG |
2778 | } |
2779 | ||
5c786ded JD |
2780 | /* |
2781 | * Get the total number of stream of that session which is used by the | |
2782 | * maximum size of the snapshot feature. | |
2783 | */ | |
2784 | nb_streams = get_total_nb_stream(session); | |
2785 | ||
6dc3064a DG |
2786 | if (session->kernel_session) { |
2787 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2788 | ||
e1986656 DG |
2789 | if (use_tmp_output) { |
2790 | ret = record_kernel_snapshot(ksess, &tmp_output, session, | |
5c786ded | 2791 | wait, nb_streams); |
a934f4af | 2792 | if (ret != LTTNG_OK) { |
6dc3064a DG |
2793 | goto error; |
2794 | } | |
1bfe7328 | 2795 | snapshot_success = 1; |
6dc3064a DG |
2796 | } else { |
2797 | struct snapshot_output *sout; | |
2798 | struct lttng_ht_iter iter; | |
2799 | ||
2800 | rcu_read_lock(); | |
2801 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
2802 | &iter.iter, sout, node.node) { | |
e1986656 DG |
2803 | /* |
2804 | * Make a local copy of the output and assign the possible | |
2805 | * temporary value given by the caller. | |
2806 | */ | |
2807 | memset(&tmp_output, 0, sizeof(tmp_output)); | |
2808 | memcpy(&tmp_output, sout, sizeof(tmp_output)); | |
2809 | ||
2810 | /* Use temporary max size. */ | |
2811 | if (output->max_size != (uint64_t) -1ULL) { | |
2812 | tmp_output.max_size = output->max_size; | |
2813 | } | |
2814 | ||
2815 | /* Use temporary name. */ | |
2816 | if (*output->name != '\0') { | |
2817 | strncpy(tmp_output.name, output->name, | |
2818 | sizeof(tmp_output.name)); | |
2819 | } | |
2820 | ||
1bfe7328 DG |
2821 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; |
2822 | ||
e1986656 | 2823 | ret = record_kernel_snapshot(ksess, &tmp_output, |
5c786ded | 2824 | session, wait, nb_streams); |
a934f4af | 2825 | if (ret != LTTNG_OK) { |
6dc3064a DG |
2826 | rcu_read_unlock(); |
2827 | goto error; | |
2828 | } | |
1bfe7328 | 2829 | snapshot_success = 1; |
6dc3064a DG |
2830 | } |
2831 | rcu_read_unlock(); | |
2832 | } | |
2833 | } | |
2834 | ||
2835 | if (session->ust_session) { | |
2836 | struct ltt_ust_session *usess = session->ust_session; | |
2837 | ||
e1986656 DG |
2838 | if (use_tmp_output) { |
2839 | ret = record_ust_snapshot(usess, &tmp_output, session, | |
5c786ded | 2840 | wait, nb_streams); |
a934f4af | 2841 | if (ret != LTTNG_OK) { |
6dc3064a DG |
2842 | goto error; |
2843 | } | |
1bfe7328 | 2844 | snapshot_success = 1; |
6dc3064a DG |
2845 | } else { |
2846 | struct snapshot_output *sout; | |
2847 | struct lttng_ht_iter iter; | |
2848 | ||
2849 | rcu_read_lock(); | |
2850 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
2851 | &iter.iter, sout, node.node) { | |
e1986656 DG |
2852 | /* |
2853 | * Make a local copy of the output and assign the possible | |
2854 | * temporary value given by the caller. | |
2855 | */ | |
2856 | memset(&tmp_output, 0, sizeof(tmp_output)); | |
2857 | memcpy(&tmp_output, sout, sizeof(tmp_output)); | |
2858 | ||
e1986656 DG |
2859 | /* Use temporary max size. */ |
2860 | if (output->max_size != (uint64_t) -1ULL) { | |
2861 | tmp_output.max_size = output->max_size; | |
2862 | } | |
2863 | ||
2864 | /* Use temporary name. */ | |
2865 | if (*output->name != '\0') { | |
2866 | strncpy(tmp_output.name, output->name, | |
2867 | sizeof(tmp_output.name)); | |
2868 | } | |
2869 | ||
1bfe7328 DG |
2870 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; |
2871 | ||
e1986656 | 2872 | ret = record_ust_snapshot(usess, &tmp_output, session, |
5c786ded | 2873 | wait, nb_streams); |
a934f4af | 2874 | if (ret != LTTNG_OK) { |
6dc3064a DG |
2875 | rcu_read_unlock(); |
2876 | goto error; | |
2877 | } | |
1bfe7328 | 2878 | snapshot_success = 1; |
6dc3064a DG |
2879 | } |
2880 | rcu_read_unlock(); | |
2881 | } | |
2882 | } | |
2883 | ||
1bfe7328 DG |
2884 | if (snapshot_success) { |
2885 | session->snapshot.nb_snapshot++; | |
b67578cb MD |
2886 | } else { |
2887 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
1bfe7328 DG |
2888 | } |
2889 | ||
6dc3064a | 2890 | error: |
6dc3064a DG |
2891 | return ret; |
2892 | } | |
2893 | ||
2f77fc4b DG |
2894 | /* |
2895 | * Init command subsystem. | |
2896 | */ | |
2897 | void cmd_init(void) | |
2898 | { | |
2899 | /* | |
d88aee68 DG |
2900 | * Set network sequence index to 1 for streams to match a relayd |
2901 | * socket on the consumer side. | |
2f77fc4b | 2902 | */ |
d88aee68 DG |
2903 | pthread_mutex_lock(&relayd_net_seq_idx_lock); |
2904 | relayd_net_seq_idx = 1; | |
2905 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
2906 | |
2907 | DBG("Command subsystem initialized"); | |
2908 | } |