Commit | Line | Data |
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2f77fc4b DG |
1 | /* |
2 | * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com> | |
bdf64013 | 3 | * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
2f77fc4b DG |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License, version 2 only, as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
16 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | */ | |
18 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
2f77fc4b | 20 | #include <assert.h> |
6dc3064a | 21 | #include <inttypes.h> |
2f77fc4b DG |
22 | #include <urcu/list.h> |
23 | #include <urcu/uatomic.h> | |
24 | ||
25 | #include <common/defaults.h> | |
26 | #include <common/common.h> | |
27 | #include <common/sessiond-comm/sessiond-comm.h> | |
28 | #include <common/relayd/relayd.h> | |
10a50311 | 29 | #include <common/utils.h> |
f5436bfc | 30 | #include <common/compat/string.h> |
2f77fc4b DG |
31 | |
32 | #include "channel.h" | |
33 | #include "consumer.h" | |
34 | #include "event.h" | |
8782cc74 | 35 | #include "health-sessiond.h" |
2f77fc4b DG |
36 | #include "kernel.h" |
37 | #include "kernel-consumer.h" | |
38 | #include "lttng-sessiond.h" | |
39 | #include "utils.h" | |
834978fd | 40 | #include "syscall.h" |
7c1d2758 | 41 | #include "agent.h" |
2f77fc4b DG |
42 | |
43 | #include "cmd.h" | |
44 | ||
45 | /* | |
46 | * Used to keep a unique index for each relayd socket created where this value | |
47 | * is associated with streams on the consumer so it can match the right relayd | |
d88aee68 DG |
48 | * to send to. It must be accessed with the relayd_net_seq_idx_lock |
49 | * held. | |
2f77fc4b | 50 | */ |
d88aee68 DG |
51 | static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER; |
52 | static uint64_t relayd_net_seq_idx; | |
2f77fc4b | 53 | |
7076b56e JG |
54 | static int validate_event_name(const char *); |
55 | static int validate_ust_event_name(const char *); | |
56 | static int cmd_enable_event_internal(struct ltt_session *session, | |
57 | struct lttng_domain *domain, | |
58 | char *channel_name, struct lttng_event *event, | |
59 | char *filter_expression, | |
60 | struct lttng_filter_bytecode *filter, | |
61 | struct lttng_event_exclusion *exclusion, | |
62 | int wpipe); | |
63 | ||
2f77fc4b DG |
64 | /* |
65 | * Create a session path used by list_lttng_sessions for the case that the | |
66 | * session consumer is on the network. | |
67 | */ | |
68 | static int build_network_session_path(char *dst, size_t size, | |
69 | struct ltt_session *session) | |
70 | { | |
71 | int ret, kdata_port, udata_port; | |
72 | struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL; | |
73 | char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX]; | |
74 | ||
75 | assert(session); | |
76 | assert(dst); | |
77 | ||
78 | memset(tmp_urls, 0, sizeof(tmp_urls)); | |
79 | memset(tmp_uurl, 0, sizeof(tmp_uurl)); | |
80 | ||
81 | kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT; | |
82 | ||
83 | if (session->kernel_session && session->kernel_session->consumer) { | |
84 | kuri = &session->kernel_session->consumer->dst.net.control; | |
85 | kdata_port = session->kernel_session->consumer->dst.net.data.port; | |
86 | } | |
87 | ||
88 | if (session->ust_session && session->ust_session->consumer) { | |
89 | uuri = &session->ust_session->consumer->dst.net.control; | |
90 | udata_port = session->ust_session->consumer->dst.net.data.port; | |
91 | } | |
92 | ||
93 | if (uuri == NULL && kuri == NULL) { | |
94 | uri = &session->consumer->dst.net.control; | |
95 | kdata_port = session->consumer->dst.net.data.port; | |
96 | } else if (kuri && uuri) { | |
97 | ret = uri_compare(kuri, uuri); | |
98 | if (ret) { | |
99 | /* Not Equal */ | |
100 | uri = kuri; | |
101 | /* Build uuri URL string */ | |
102 | ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl)); | |
103 | if (ret < 0) { | |
104 | goto error; | |
105 | } | |
106 | } else { | |
107 | uri = kuri; | |
108 | } | |
109 | } else if (kuri && uuri == NULL) { | |
110 | uri = kuri; | |
111 | } else if (uuri && kuri == NULL) { | |
112 | uri = uuri; | |
113 | } | |
114 | ||
115 | ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls)); | |
116 | if (ret < 0) { | |
117 | goto error; | |
118 | } | |
119 | ||
9aa9f900 DG |
120 | /* |
121 | * Do we have a UST url set. If yes, this means we have both kernel and UST | |
122 | * to print. | |
123 | */ | |
9d035200 | 124 | if (*tmp_uurl != '\0') { |
2f77fc4b DG |
125 | ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]", |
126 | tmp_urls, kdata_port, tmp_uurl, udata_port); | |
127 | } else { | |
9aa9f900 | 128 | int dport; |
bef08707 | 129 | if (kuri || (!kuri && !uuri)) { |
9aa9f900 DG |
130 | dport = kdata_port; |
131 | } else { | |
132 | /* No kernel URI, use the UST port. */ | |
133 | dport = udata_port; | |
134 | } | |
135 | ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport); | |
2f77fc4b DG |
136 | } |
137 | ||
138 | error: | |
139 | return ret; | |
140 | } | |
141 | ||
fb83fe64 JD |
142 | /* |
143 | * Get run-time attributes if the session has been started (discarded events, | |
144 | * lost packets). | |
145 | */ | |
146 | static int get_kernel_runtime_stats(struct ltt_session *session, | |
147 | struct ltt_kernel_channel *kchan, uint64_t *discarded_events, | |
148 | uint64_t *lost_packets) | |
149 | { | |
150 | int ret; | |
151 | ||
152 | if (!session->has_been_started) { | |
153 | ret = 0; | |
154 | *discarded_events = 0; | |
155 | *lost_packets = 0; | |
156 | goto end; | |
157 | } | |
158 | ||
159 | ret = consumer_get_discarded_events(session->id, kchan->fd, | |
160 | session->kernel_session->consumer, | |
161 | discarded_events); | |
162 | if (ret < 0) { | |
163 | goto end; | |
164 | } | |
165 | ||
166 | ret = consumer_get_lost_packets(session->id, kchan->fd, | |
167 | session->kernel_session->consumer, | |
168 | lost_packets); | |
169 | if (ret < 0) { | |
170 | goto end; | |
171 | } | |
172 | ||
173 | end: | |
174 | return ret; | |
175 | } | |
176 | ||
177 | /* | |
178 | * Get run-time attributes if the session has been started (discarded events, | |
179 | * lost packets). | |
180 | */ | |
181 | static int get_ust_runtime_stats(struct ltt_session *session, | |
182 | struct ltt_ust_channel *uchan, uint64_t *discarded_events, | |
183 | uint64_t *lost_packets) | |
184 | { | |
185 | int ret; | |
186 | struct ltt_ust_session *usess; | |
187 | ||
188 | usess = session->ust_session; | |
189 | ||
190 | if (!usess || !session->has_been_started) { | |
191 | *discarded_events = 0; | |
192 | *lost_packets = 0; | |
193 | ret = 0; | |
194 | goto end; | |
195 | } | |
196 | ||
197 | if (usess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
198 | ret = ust_app_uid_get_channel_runtime_stats(usess->id, | |
199 | &usess->buffer_reg_uid_list, | |
200 | usess->consumer, uchan->id, | |
201 | uchan->attr.overwrite, | |
202 | discarded_events, | |
203 | lost_packets); | |
204 | } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
205 | ret = ust_app_pid_get_channel_runtime_stats(usess, | |
206 | uchan, usess->consumer, | |
207 | uchan->attr.overwrite, | |
208 | discarded_events, | |
209 | lost_packets); | |
210 | if (ret < 0) { | |
211 | goto end; | |
212 | } | |
213 | *discarded_events += uchan->per_pid_closed_app_discarded; | |
214 | *lost_packets += uchan->per_pid_closed_app_lost; | |
215 | } else { | |
216 | ERR("Unsupported buffer type"); | |
217 | ret = -1; | |
218 | goto end; | |
219 | } | |
220 | ||
221 | end: | |
222 | return ret; | |
223 | } | |
224 | ||
2f77fc4b DG |
225 | /* |
226 | * Fill lttng_channel array of all channels. | |
227 | */ | |
56a37563 | 228 | static void list_lttng_channels(enum lttng_domain_type domain, |
fb83fe64 JD |
229 | struct ltt_session *session, struct lttng_channel *channels, |
230 | struct lttcomm_channel_extended *chan_exts) | |
2f77fc4b | 231 | { |
fb83fe64 | 232 | int i = 0, ret; |
2f77fc4b DG |
233 | struct ltt_kernel_channel *kchan; |
234 | ||
235 | DBG("Listing channels for session %s", session->name); | |
236 | ||
237 | switch (domain) { | |
238 | case LTTNG_DOMAIN_KERNEL: | |
239 | /* Kernel channels */ | |
240 | if (session->kernel_session != NULL) { | |
241 | cds_list_for_each_entry(kchan, | |
242 | &session->kernel_session->channel_list.head, list) { | |
fb83fe64 JD |
243 | uint64_t discarded_events, lost_packets; |
244 | ||
245 | ret = get_kernel_runtime_stats(session, kchan, | |
246 | &discarded_events, &lost_packets); | |
247 | if (ret < 0) { | |
248 | goto end; | |
249 | } | |
2f77fc4b DG |
250 | /* Copy lttng_channel struct to array */ |
251 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
252 | channels[i].enabled = kchan->enabled; | |
fb83fe64 JD |
253 | chan_exts[i].discarded_events = |
254 | discarded_events; | |
255 | chan_exts[i].lost_packets = lost_packets; | |
2f77fc4b DG |
256 | i++; |
257 | } | |
258 | } | |
259 | break; | |
260 | case LTTNG_DOMAIN_UST: | |
261 | { | |
262 | struct lttng_ht_iter iter; | |
263 | struct ltt_ust_channel *uchan; | |
264 | ||
e7fe706f | 265 | rcu_read_lock(); |
2f77fc4b DG |
266 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
267 | &iter.iter, uchan, node.node) { | |
fb83fe64 JD |
268 | uint64_t discarded_events, lost_packets; |
269 | ||
2f77fc4b DG |
270 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); |
271 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
272 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
273 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
274 | channels[i].attr.switch_timer_interval = | |
275 | uchan->attr.switch_timer_interval; | |
276 | channels[i].attr.read_timer_interval = | |
277 | uchan->attr.read_timer_interval; | |
278 | channels[i].enabled = uchan->enabled; | |
2f785fe7 DG |
279 | channels[i].attr.tracefile_size = uchan->tracefile_size; |
280 | channels[i].attr.tracefile_count = uchan->tracefile_count; | |
2f77fc4b DG |
281 | switch (uchan->attr.output) { |
282 | case LTTNG_UST_MMAP: | |
283 | default: | |
284 | channels[i].attr.output = LTTNG_EVENT_MMAP; | |
285 | break; | |
286 | } | |
fb83fe64 JD |
287 | |
288 | ret = get_ust_runtime_stats(session, uchan, | |
289 | &discarded_events, &lost_packets); | |
290 | if (ret < 0) { | |
291 | break; | |
292 | } | |
293 | chan_exts[i].discarded_events = discarded_events; | |
294 | chan_exts[i].lost_packets = lost_packets; | |
2f77fc4b DG |
295 | i++; |
296 | } | |
e7fe706f | 297 | rcu_read_unlock(); |
2f77fc4b DG |
298 | break; |
299 | } | |
300 | default: | |
301 | break; | |
302 | } | |
fb83fe64 JD |
303 | |
304 | end: | |
305 | return; | |
2f77fc4b DG |
306 | } |
307 | ||
b4e3ceb9 | 308 | static void increment_extended_len(const char *filter_expression, |
795d57ce | 309 | struct lttng_event_exclusion *exclusion, size_t *extended_len) |
b4e3ceb9 PP |
310 | { |
311 | *extended_len += sizeof(struct lttcomm_event_extended_header); | |
312 | ||
313 | if (filter_expression) { | |
314 | *extended_len += strlen(filter_expression) + 1; | |
315 | } | |
795d57ce PP |
316 | |
317 | if (exclusion) { | |
318 | *extended_len += exclusion->count * LTTNG_SYMBOL_NAME_LEN; | |
319 | } | |
b4e3ceb9 PP |
320 | } |
321 | ||
322 | static void append_extended_info(const char *filter_expression, | |
795d57ce | 323 | struct lttng_event_exclusion *exclusion, void **extended_at) |
b4e3ceb9 PP |
324 | { |
325 | struct lttcomm_event_extended_header extended_header; | |
326 | size_t filter_len = 0; | |
795d57ce | 327 | size_t nb_exclusions = 0; |
b4e3ceb9 PP |
328 | |
329 | if (filter_expression) { | |
330 | filter_len = strlen(filter_expression) + 1; | |
331 | } | |
332 | ||
795d57ce PP |
333 | if (exclusion) { |
334 | nb_exclusions = exclusion->count; | |
335 | } | |
336 | ||
337 | /* Set header fields */ | |
b4e3ceb9 | 338 | extended_header.filter_len = filter_len; |
795d57ce PP |
339 | extended_header.nb_exclusions = nb_exclusions; |
340 | ||
341 | /* Copy header */ | |
b4e3ceb9 PP |
342 | memcpy(*extended_at, &extended_header, sizeof(extended_header)); |
343 | *extended_at += sizeof(extended_header); | |
795d57ce PP |
344 | |
345 | /* Copy filter string */ | |
346 | if (filter_expression) { | |
347 | memcpy(*extended_at, filter_expression, filter_len); | |
348 | *extended_at += filter_len; | |
349 | } | |
350 | ||
351 | /* Copy exclusion names */ | |
352 | if (exclusion) { | |
353 | size_t len = nb_exclusions * LTTNG_SYMBOL_NAME_LEN; | |
354 | ||
355 | memcpy(*extended_at, &exclusion->names, len); | |
356 | *extended_at += len; | |
357 | } | |
b4e3ceb9 PP |
358 | } |
359 | ||
3c6a091f | 360 | /* |
022d91ba | 361 | * Create a list of agent domain events. |
3c6a091f DG |
362 | * |
363 | * Return number of events in list on success or else a negative value. | |
364 | */ | |
022d91ba | 365 | static int list_lttng_agent_events(struct agent *agt, |
b4e3ceb9 | 366 | struct lttng_event **events, size_t *total_size) |
3c6a091f DG |
367 | { |
368 | int i = 0, ret = 0; | |
369 | unsigned int nb_event = 0; | |
022d91ba | 370 | struct agent_event *event; |
3c6a091f DG |
371 | struct lttng_event *tmp_events; |
372 | struct lttng_ht_iter iter; | |
b4e3ceb9 PP |
373 | size_t extended_len = 0; |
374 | void *extended_at; | |
3c6a091f | 375 | |
022d91ba | 376 | assert(agt); |
3c6a091f DG |
377 | assert(events); |
378 | ||
022d91ba | 379 | DBG3("Listing agent events"); |
3c6a091f | 380 | |
e5bbf678 | 381 | rcu_read_lock(); |
022d91ba | 382 | nb_event = lttng_ht_get_count(agt->events); |
e5bbf678 | 383 | rcu_read_unlock(); |
3c6a091f DG |
384 | if (nb_event == 0) { |
385 | ret = nb_event; | |
b4e3ceb9 | 386 | *total_size = 0; |
3c6a091f DG |
387 | goto error; |
388 | } | |
389 | ||
b4e3ceb9 PP |
390 | /* Compute required extended infos size */ |
391 | extended_len = nb_event * sizeof(struct lttcomm_event_extended_header); | |
392 | ||
393 | /* | |
394 | * This is only valid because the commands which add events are | |
395 | * processed in the same thread as the listing. | |
396 | */ | |
397 | rcu_read_lock(); | |
398 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { | |
795d57ce PP |
399 | increment_extended_len(event->filter_expression, NULL, |
400 | &extended_len); | |
b4e3ceb9 PP |
401 | } |
402 | rcu_read_unlock(); | |
403 | ||
404 | *total_size = nb_event * sizeof(*tmp_events) + extended_len; | |
405 | tmp_events = zmalloc(*total_size); | |
3c6a091f | 406 | if (!tmp_events) { |
022d91ba | 407 | PERROR("zmalloc agent events session"); |
3c6a091f DG |
408 | ret = -LTTNG_ERR_FATAL; |
409 | goto error; | |
410 | } | |
411 | ||
b4e3ceb9 PP |
412 | extended_at = ((uint8_t *) tmp_events) + |
413 | nb_event * sizeof(struct lttng_event); | |
414 | ||
3c6a091f | 415 | rcu_read_lock(); |
022d91ba | 416 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
3c6a091f DG |
417 | strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name)); |
418 | tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0'; | |
419 | tmp_events[i].enabled = event->enabled; | |
2106efa0 | 420 | tmp_events[i].loglevel = event->loglevel_value; |
ff94328f | 421 | tmp_events[i].loglevel_type = event->loglevel_type; |
3c6a091f | 422 | i++; |
b4e3ceb9 PP |
423 | |
424 | /* Append extended info */ | |
795d57ce PP |
425 | append_extended_info(event->filter_expression, NULL, |
426 | &extended_at); | |
3c6a091f DG |
427 | } |
428 | rcu_read_unlock(); | |
429 | ||
430 | *events = tmp_events; | |
431 | ret = nb_event; | |
432 | ||
433 | error: | |
434 | assert(nb_event == i); | |
435 | return ret; | |
436 | } | |
437 | ||
2f77fc4b DG |
438 | /* |
439 | * Create a list of ust global domain events. | |
440 | */ | |
441 | static int list_lttng_ust_global_events(char *channel_name, | |
b4e3ceb9 PP |
442 | struct ltt_ust_domain_global *ust_global, |
443 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
444 | { |
445 | int i = 0, ret = 0; | |
446 | unsigned int nb_event = 0; | |
447 | struct lttng_ht_iter iter; | |
448 | struct lttng_ht_node_str *node; | |
449 | struct ltt_ust_channel *uchan; | |
450 | struct ltt_ust_event *uevent; | |
451 | struct lttng_event *tmp; | |
b4e3ceb9 PP |
452 | size_t extended_len = 0; |
453 | void *extended_at; | |
2f77fc4b DG |
454 | |
455 | DBG("Listing UST global events for channel %s", channel_name); | |
456 | ||
457 | rcu_read_lock(); | |
458 | ||
459 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); | |
460 | node = lttng_ht_iter_get_node_str(&iter); | |
461 | if (node == NULL) { | |
f73fabfd | 462 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
d31d3e8c | 463 | goto end; |
2f77fc4b DG |
464 | } |
465 | ||
466 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); | |
467 | ||
3c442be3 | 468 | nb_event = lttng_ht_get_count(uchan->events); |
2f77fc4b DG |
469 | if (nb_event == 0) { |
470 | ret = nb_event; | |
b4e3ceb9 | 471 | *total_size = 0; |
d31d3e8c | 472 | goto end; |
2f77fc4b DG |
473 | } |
474 | ||
475 | DBG3("Listing UST global %d events", nb_event); | |
476 | ||
b4e3ceb9 PP |
477 | /* Compute required extended infos size */ |
478 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { | |
479 | if (uevent->internal) { | |
480 | nb_event--; | |
481 | continue; | |
482 | } | |
483 | ||
484 | increment_extended_len(uevent->filter_expression, | |
795d57ce | 485 | uevent->exclusion, &extended_len); |
b4e3ceb9 | 486 | } |
d31d3e8c PP |
487 | if (nb_event == 0) { |
488 | /* All events are internal, skip. */ | |
489 | ret = 0; | |
490 | *total_size = 0; | |
491 | goto end; | |
492 | } | |
b4e3ceb9 PP |
493 | |
494 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
495 | tmp = zmalloc(*total_size); | |
2f77fc4b | 496 | if (tmp == NULL) { |
b12c38df JG |
497 | ret = -LTTNG_ERR_FATAL; |
498 | goto end; | |
2f77fc4b DG |
499 | } |
500 | ||
b4e3ceb9 PP |
501 | extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event); |
502 | ||
2f77fc4b | 503 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
3c442be3 JG |
504 | if (uevent->internal) { |
505 | /* This event should remain hidden from clients */ | |
3c442be3 JG |
506 | continue; |
507 | } | |
2f77fc4b DG |
508 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
509 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
510 | tmp[i].enabled = uevent->enabled; | |
511 | ||
512 | switch (uevent->attr.instrumentation) { | |
513 | case LTTNG_UST_TRACEPOINT: | |
514 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
515 | break; | |
516 | case LTTNG_UST_PROBE: | |
517 | tmp[i].type = LTTNG_EVENT_PROBE; | |
518 | break; | |
519 | case LTTNG_UST_FUNCTION: | |
520 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
521 | break; | |
522 | } | |
523 | ||
524 | tmp[i].loglevel = uevent->attr.loglevel; | |
525 | switch (uevent->attr.loglevel_type) { | |
526 | case LTTNG_UST_LOGLEVEL_ALL: | |
527 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
528 | break; | |
529 | case LTTNG_UST_LOGLEVEL_RANGE: | |
530 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; | |
531 | break; | |
532 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
533 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; | |
534 | break; | |
535 | } | |
536 | if (uevent->filter) { | |
537 | tmp[i].filter = 1; | |
538 | } | |
4634f12e JI |
539 | if (uevent->exclusion) { |
540 | tmp[i].exclusion = 1; | |
541 | } | |
2f77fc4b | 542 | i++; |
b4e3ceb9 PP |
543 | |
544 | /* Append extended info */ | |
795d57ce PP |
545 | append_extended_info(uevent->filter_expression, |
546 | uevent->exclusion, &extended_at); | |
2f77fc4b DG |
547 | } |
548 | ||
549 | ret = nb_event; | |
550 | *events = tmp; | |
d31d3e8c | 551 | end: |
2f77fc4b DG |
552 | rcu_read_unlock(); |
553 | return ret; | |
554 | } | |
555 | ||
556 | /* | |
557 | * Fill lttng_event array of all kernel events in the channel. | |
558 | */ | |
559 | static int list_lttng_kernel_events(char *channel_name, | |
b4e3ceb9 PP |
560 | struct ltt_kernel_session *kernel_session, |
561 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
562 | { |
563 | int i = 0, ret; | |
564 | unsigned int nb_event; | |
565 | struct ltt_kernel_event *event; | |
566 | struct ltt_kernel_channel *kchan; | |
b4e3ceb9 PP |
567 | size_t extended_len = 0; |
568 | void *extended_at; | |
2f77fc4b DG |
569 | |
570 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
571 | if (kchan == NULL) { | |
f73fabfd | 572 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
573 | goto error; |
574 | } | |
575 | ||
576 | nb_event = kchan->event_count; | |
577 | ||
578 | DBG("Listing events for channel %s", kchan->channel->name); | |
579 | ||
580 | if (nb_event == 0) { | |
b4e3ceb9 | 581 | *total_size = 0; |
834978fd DG |
582 | *events = NULL; |
583 | goto syscall; | |
2f77fc4b DG |
584 | } |
585 | ||
b4e3ceb9 PP |
586 | /* Compute required extended infos size */ |
587 | cds_list_for_each_entry(event, &kchan->events_list.head, list) { | |
795d57ce PP |
588 | increment_extended_len(event->filter_expression, NULL, |
589 | &extended_len); | |
b4e3ceb9 PP |
590 | } |
591 | ||
592 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
593 | *events = zmalloc(*total_size); | |
2f77fc4b | 594 | if (*events == NULL) { |
f73fabfd | 595 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
596 | goto error; |
597 | } | |
598 | ||
b4e3ceb9 PP |
599 | extended_at = ((uint8_t *) events) + |
600 | nb_event * sizeof(struct lttng_event); | |
601 | ||
2f77fc4b DG |
602 | /* Kernel channels */ |
603 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
604 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
605 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
606 | (*events)[i].enabled = event->enabled; | |
00f992f2 JG |
607 | (*events)[i].filter = |
608 | (unsigned char) !!event->filter_expression; | |
2f77fc4b DG |
609 | |
610 | switch (event->event->instrumentation) { | |
611 | case LTTNG_KERNEL_TRACEPOINT: | |
612 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; | |
613 | break; | |
2f77fc4b | 614 | case LTTNG_KERNEL_KRETPROBE: |
1896972b DG |
615 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
616 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
617 | sizeof(struct lttng_kernel_kprobe)); | |
618 | break; | |
619 | case LTTNG_KERNEL_KPROBE: | |
2f77fc4b DG |
620 | (*events)[i].type = LTTNG_EVENT_PROBE; |
621 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
622 | sizeof(struct lttng_kernel_kprobe)); | |
623 | break; | |
624 | case LTTNG_KERNEL_FUNCTION: | |
625 | (*events)[i].type = LTTNG_EVENT_FUNCTION; | |
626 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
627 | sizeof(struct lttng_kernel_function)); | |
628 | break; | |
629 | case LTTNG_KERNEL_NOOP: | |
630 | (*events)[i].type = LTTNG_EVENT_NOOP; | |
631 | break; | |
632 | case LTTNG_KERNEL_SYSCALL: | |
633 | (*events)[i].type = LTTNG_EVENT_SYSCALL; | |
634 | break; | |
635 | case LTTNG_KERNEL_ALL: | |
636 | assert(0); | |
637 | break; | |
638 | } | |
639 | i++; | |
b4e3ceb9 PP |
640 | |
641 | /* Append extended info */ | |
795d57ce PP |
642 | append_extended_info(event->filter_expression, NULL, |
643 | &extended_at); | |
2f77fc4b DG |
644 | } |
645 | ||
834978fd DG |
646 | syscall: |
647 | if (syscall_table) { | |
648 | ssize_t new_size; | |
649 | ||
650 | new_size = syscall_list_channel(kchan, events, nb_event); | |
651 | if (new_size < 0) { | |
652 | free(events); | |
653 | ret = -new_size; | |
654 | goto error; | |
655 | } | |
656 | nb_event = new_size; | |
657 | } | |
658 | ||
2f77fc4b DG |
659 | return nb_event; |
660 | ||
661 | error: | |
f73fabfd DG |
662 | /* Negate the error code to differentiate the size from an error */ |
663 | return -ret; | |
2f77fc4b DG |
664 | } |
665 | ||
666 | /* | |
667 | * Add URI so the consumer output object. Set the correct path depending on the | |
668 | * domain adding the default trace directory. | |
669 | */ | |
670 | static int add_uri_to_consumer(struct consumer_output *consumer, | |
56a37563 JG |
671 | struct lttng_uri *uri, enum lttng_domain_type domain, |
672 | const char *session_name) | |
2f77fc4b | 673 | { |
f73fabfd | 674 | int ret = LTTNG_OK; |
2f77fc4b DG |
675 | const char *default_trace_dir; |
676 | ||
677 | assert(uri); | |
678 | ||
679 | if (consumer == NULL) { | |
680 | DBG("No consumer detected. Don't add URI. Stopping."); | |
f73fabfd | 681 | ret = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
682 | goto error; |
683 | } | |
684 | ||
685 | switch (domain) { | |
686 | case LTTNG_DOMAIN_KERNEL: | |
687 | default_trace_dir = DEFAULT_KERNEL_TRACE_DIR; | |
688 | break; | |
689 | case LTTNG_DOMAIN_UST: | |
690 | default_trace_dir = DEFAULT_UST_TRACE_DIR; | |
691 | break; | |
692 | default: | |
693 | /* | |
694 | * This case is possible is we try to add the URI to the global tracing | |
695 | * session consumer object which in this case there is no subdir. | |
696 | */ | |
697 | default_trace_dir = ""; | |
698 | } | |
699 | ||
700 | switch (uri->dtype) { | |
701 | case LTTNG_DST_IPV4: | |
702 | case LTTNG_DST_IPV6: | |
703 | DBG2("Setting network URI to consumer"); | |
704 | ||
df75acac DG |
705 | if (consumer->type == CONSUMER_DST_NET) { |
706 | if ((uri->stype == LTTNG_STREAM_CONTROL && | |
785d2d0d DG |
707 | consumer->dst.net.control_isset) || |
708 | (uri->stype == LTTNG_STREAM_DATA && | |
709 | consumer->dst.net.data_isset)) { | |
df75acac DG |
710 | ret = LTTNG_ERR_URL_EXIST; |
711 | goto error; | |
712 | } | |
713 | } else { | |
714 | memset(&consumer->dst.net, 0, sizeof(consumer->dst.net)); | |
785d2d0d DG |
715 | } |
716 | ||
df75acac DG |
717 | consumer->type = CONSUMER_DST_NET; |
718 | ||
2f77fc4b DG |
719 | /* Set URI into consumer output object */ |
720 | ret = consumer_set_network_uri(consumer, uri); | |
721 | if (ret < 0) { | |
a74934ba | 722 | ret = -ret; |
2f77fc4b DG |
723 | goto error; |
724 | } else if (ret == 1) { | |
725 | /* | |
726 | * URI was the same in the consumer so we do not append the subdir | |
727 | * again so to not duplicate output dir. | |
728 | */ | |
f86c9f4e | 729 | ret = LTTNG_OK; |
2f77fc4b DG |
730 | goto error; |
731 | } | |
732 | ||
733 | if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) { | |
734 | ret = consumer_set_subdir(consumer, session_name); | |
735 | if (ret < 0) { | |
f73fabfd | 736 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
737 | goto error; |
738 | } | |
739 | } | |
740 | ||
741 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
742 | /* On a new subdir, reappend the default trace dir. */ | |
c30ce0b3 CB |
743 | strncat(consumer->subdir, default_trace_dir, |
744 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
745 | DBG3("Append domain trace name to subdir %s", consumer->subdir); |
746 | } | |
747 | ||
748 | break; | |
749 | case LTTNG_DST_PATH: | |
750 | DBG2("Setting trace directory path from URI to %s", uri->dst.path); | |
751 | memset(consumer->dst.trace_path, 0, | |
752 | sizeof(consumer->dst.trace_path)); | |
753 | strncpy(consumer->dst.trace_path, uri->dst.path, | |
754 | sizeof(consumer->dst.trace_path)); | |
755 | /* Append default trace dir */ | |
756 | strncat(consumer->dst.trace_path, default_trace_dir, | |
c30ce0b3 CB |
757 | sizeof(consumer->dst.trace_path) - |
758 | strlen(consumer->dst.trace_path) - 1); | |
2f77fc4b DG |
759 | /* Flag consumer as local. */ |
760 | consumer->type = CONSUMER_DST_LOCAL; | |
761 | break; | |
762 | } | |
763 | ||
a74934ba DG |
764 | ret = LTTNG_OK; |
765 | ||
2f77fc4b DG |
766 | error: |
767 | return ret; | |
768 | } | |
769 | ||
770 | /* | |
771 | * Init tracing by creating trace directory and sending fds kernel consumer. | |
772 | */ | |
773 | static int init_kernel_tracing(struct ltt_kernel_session *session) | |
774 | { | |
775 | int ret = 0; | |
776 | struct lttng_ht_iter iter; | |
777 | struct consumer_socket *socket; | |
778 | ||
779 | assert(session); | |
780 | ||
e7fe706f DG |
781 | rcu_read_lock(); |
782 | ||
2f77fc4b DG |
783 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { |
784 | cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter, | |
785 | socket, node.node) { | |
2f77fc4b | 786 | pthread_mutex_lock(socket->lock); |
f50f23d9 | 787 | ret = kernel_consumer_send_session(socket, session); |
2f77fc4b DG |
788 | pthread_mutex_unlock(socket->lock); |
789 | if (ret < 0) { | |
f73fabfd | 790 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
791 | goto error; |
792 | } | |
793 | } | |
794 | } | |
795 | ||
796 | error: | |
e7fe706f | 797 | rcu_read_unlock(); |
2f77fc4b DG |
798 | return ret; |
799 | } | |
800 | ||
801 | /* | |
802 | * Create a socket to the relayd using the URI. | |
803 | * | |
804 | * On success, the relayd_sock pointer is set to the created socket. | |
805 | * Else, it's stays untouched and a lttcomm error code is returned. | |
806 | */ | |
6151a90f JD |
807 | static int create_connect_relayd(struct lttng_uri *uri, |
808 | struct lttcomm_relayd_sock **relayd_sock) | |
2f77fc4b DG |
809 | { |
810 | int ret; | |
6151a90f | 811 | struct lttcomm_relayd_sock *rsock; |
2f77fc4b | 812 | |
6151a90f JD |
813 | rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR, |
814 | RELAYD_VERSION_COMM_MINOR); | |
815 | if (!rsock) { | |
f73fabfd | 816 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
817 | goto error; |
818 | } | |
819 | ||
ffe60014 DG |
820 | /* |
821 | * Connect to relayd so we can proceed with a session creation. This call | |
822 | * can possibly block for an arbitrary amount of time to set the health | |
823 | * state to be in poll execution. | |
824 | */ | |
825 | health_poll_entry(); | |
6151a90f | 826 | ret = relayd_connect(rsock); |
ffe60014 | 827 | health_poll_exit(); |
2f77fc4b DG |
828 | if (ret < 0) { |
829 | ERR("Unable to reach lttng-relayd"); | |
f73fabfd | 830 | ret = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
831 | goto free_sock; |
832 | } | |
833 | ||
834 | /* Create socket for control stream. */ | |
835 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
836 | DBG3("Creating relayd stream socket from URI"); | |
837 | ||
838 | /* Check relayd version */ | |
6151a90f | 839 | ret = relayd_version_check(rsock); |
2f77fc4b | 840 | if (ret < 0) { |
f73fabfd | 841 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; |
2f77fc4b DG |
842 | goto close_sock; |
843 | } | |
844 | } else if (uri->stype == LTTNG_STREAM_DATA) { | |
845 | DBG3("Creating relayd data socket from URI"); | |
846 | } else { | |
847 | /* Command is not valid */ | |
848 | ERR("Relayd invalid stream type: %d", uri->stype); | |
f73fabfd | 849 | ret = LTTNG_ERR_INVALID; |
2f77fc4b DG |
850 | goto close_sock; |
851 | } | |
852 | ||
6151a90f | 853 | *relayd_sock = rsock; |
2f77fc4b | 854 | |
f73fabfd | 855 | return LTTNG_OK; |
2f77fc4b DG |
856 | |
857 | close_sock: | |
6151a90f JD |
858 | /* The returned value is not useful since we are on an error path. */ |
859 | (void) relayd_close(rsock); | |
2f77fc4b | 860 | free_sock: |
6151a90f | 861 | free(rsock); |
2f77fc4b DG |
862 | error: |
863 | return ret; | |
864 | } | |
865 | ||
866 | /* | |
867 | * Connect to the relayd using URI and send the socket to the right consumer. | |
868 | */ | |
56a37563 JG |
869 | static int send_consumer_relayd_socket(enum lttng_domain_type domain, |
870 | unsigned int session_id, struct lttng_uri *relayd_uri, | |
871 | struct consumer_output *consumer, | |
d3e2ba59 JD |
872 | struct consumer_socket *consumer_sock, |
873 | char *session_name, char *hostname, int session_live_timer) | |
2f77fc4b DG |
874 | { |
875 | int ret; | |
6151a90f | 876 | struct lttcomm_relayd_sock *rsock = NULL; |
2f77fc4b | 877 | |
ffe60014 | 878 | /* Connect to relayd and make version check if uri is the control. */ |
6151a90f | 879 | ret = create_connect_relayd(relayd_uri, &rsock); |
ffe60014 | 880 | if (ret != LTTNG_OK) { |
6151a90f | 881 | goto error; |
ffe60014 | 882 | } |
6151a90f | 883 | assert(rsock); |
ffe60014 | 884 | |
2f77fc4b | 885 | /* Set the network sequence index if not set. */ |
d88aee68 DG |
886 | if (consumer->net_seq_index == (uint64_t) -1ULL) { |
887 | pthread_mutex_lock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
888 | /* |
889 | * Increment net_seq_idx because we are about to transfer the | |
890 | * new relayd socket to the consumer. | |
d88aee68 | 891 | * Assign unique key so the consumer can match streams. |
2f77fc4b | 892 | */ |
d88aee68 DG |
893 | consumer->net_seq_index = ++relayd_net_seq_idx; |
894 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
895 | } |
896 | ||
2f77fc4b | 897 | /* Send relayd socket to consumer. */ |
6151a90f | 898 | ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer, |
d3e2ba59 JD |
899 | relayd_uri->stype, session_id, |
900 | session_name, hostname, session_live_timer); | |
2f77fc4b | 901 | if (ret < 0) { |
f73fabfd | 902 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
903 | goto close_sock; |
904 | } | |
905 | ||
c890b720 DG |
906 | /* Flag that the corresponding socket was sent. */ |
907 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
ffe60014 | 908 | consumer_sock->control_sock_sent = 1; |
c890b720 | 909 | } else if (relayd_uri->stype == LTTNG_STREAM_DATA) { |
ffe60014 | 910 | consumer_sock->data_sock_sent = 1; |
c890b720 DG |
911 | } |
912 | ||
f73fabfd | 913 | ret = LTTNG_OK; |
2f77fc4b DG |
914 | |
915 | /* | |
916 | * Close socket which was dup on the consumer side. The session daemon does | |
917 | * NOT keep track of the relayd socket(s) once transfer to the consumer. | |
918 | */ | |
919 | ||
920 | close_sock: | |
6151a90f JD |
921 | (void) relayd_close(rsock); |
922 | free(rsock); | |
2f77fc4b | 923 | |
6151a90f | 924 | error: |
ffe60014 DG |
925 | if (ret != LTTNG_OK) { |
926 | /* | |
d9078d0c DG |
927 | * The consumer output for this session should not be used anymore |
928 | * since the relayd connection failed thus making any tracing or/and | |
929 | * streaming not usable. | |
ffe60014 | 930 | */ |
d9078d0c | 931 | consumer->enabled = 0; |
ffe60014 | 932 | } |
2f77fc4b DG |
933 | return ret; |
934 | } | |
935 | ||
936 | /* | |
937 | * Send both relayd sockets to a specific consumer and domain. This is a | |
938 | * helper function to facilitate sending the information to the consumer for a | |
939 | * session. | |
940 | */ | |
56a37563 JG |
941 | static int send_consumer_relayd_sockets(enum lttng_domain_type domain, |
942 | unsigned int session_id, struct consumer_output *consumer, | |
943 | struct consumer_socket *sock, char *session_name, | |
944 | char *hostname, int session_live_timer) | |
2f77fc4b | 945 | { |
dda67f6c | 946 | int ret = LTTNG_OK; |
2f77fc4b | 947 | |
2f77fc4b | 948 | assert(consumer); |
6dc3064a | 949 | assert(sock); |
2f77fc4b | 950 | |
2f77fc4b | 951 | /* Sending control relayd socket. */ |
ffe60014 | 952 | if (!sock->control_sock_sent) { |
6dc3064a | 953 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
954 | &consumer->dst.net.control, consumer, sock, |
955 | session_name, hostname, session_live_timer); | |
c890b720 DG |
956 | if (ret != LTTNG_OK) { |
957 | goto error; | |
958 | } | |
2f77fc4b DG |
959 | } |
960 | ||
961 | /* Sending data relayd socket. */ | |
ffe60014 | 962 | if (!sock->data_sock_sent) { |
6dc3064a | 963 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
964 | &consumer->dst.net.data, consumer, sock, |
965 | session_name, hostname, session_live_timer); | |
c890b720 DG |
966 | if (ret != LTTNG_OK) { |
967 | goto error; | |
968 | } | |
2f77fc4b DG |
969 | } |
970 | ||
2f77fc4b DG |
971 | error: |
972 | return ret; | |
973 | } | |
974 | ||
975 | /* | |
976 | * Setup relayd connections for a tracing session. First creates the socket to | |
977 | * the relayd and send them to the right domain consumer. Consumer type MUST be | |
978 | * network. | |
979 | */ | |
ffe60014 | 980 | int cmd_setup_relayd(struct ltt_session *session) |
2f77fc4b | 981 | { |
f73fabfd | 982 | int ret = LTTNG_OK; |
2f77fc4b DG |
983 | struct ltt_ust_session *usess; |
984 | struct ltt_kernel_session *ksess; | |
985 | struct consumer_socket *socket; | |
986 | struct lttng_ht_iter iter; | |
987 | ||
988 | assert(session); | |
989 | ||
990 | usess = session->ust_session; | |
991 | ksess = session->kernel_session; | |
992 | ||
785d2d0d | 993 | DBG("Setting relayd for session %s", session->name); |
2f77fc4b | 994 | |
e7fe706f DG |
995 | rcu_read_lock(); |
996 | ||
2f77fc4b DG |
997 | if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET |
998 | && usess->consumer->enabled) { | |
999 | /* For each consumer socket, send relayd sockets */ | |
1000 | cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, | |
1001 | socket, node.node) { | |
2f77fc4b | 1002 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1003 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id, |
d3e2ba59 JD |
1004 | usess->consumer, socket, |
1005 | session->name, session->hostname, | |
1006 | session->live_timer); | |
2f77fc4b | 1007 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1008 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1009 | goto error; |
1010 | } | |
6dc3064a DG |
1011 | /* Session is now ready for network streaming. */ |
1012 | session->net_handle = 1; | |
2f77fc4b DG |
1013 | } |
1014 | } | |
1015 | ||
1016 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET | |
1017 | && ksess->consumer->enabled) { | |
1018 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1019 | socket, node.node) { | |
2f77fc4b | 1020 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1021 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id, |
d3e2ba59 JD |
1022 | ksess->consumer, socket, |
1023 | session->name, session->hostname, | |
1024 | session->live_timer); | |
2f77fc4b | 1025 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1026 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1027 | goto error; |
1028 | } | |
6dc3064a DG |
1029 | /* Session is now ready for network streaming. */ |
1030 | session->net_handle = 1; | |
2f77fc4b DG |
1031 | } |
1032 | } | |
1033 | ||
1034 | error: | |
e7fe706f | 1035 | rcu_read_unlock(); |
2f77fc4b DG |
1036 | return ret; |
1037 | } | |
1038 | ||
9b6c7ec5 DG |
1039 | /* |
1040 | * Start a kernel session by opening all necessary streams. | |
1041 | */ | |
1042 | static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe) | |
1043 | { | |
1044 | int ret; | |
1045 | struct ltt_kernel_channel *kchan; | |
1046 | ||
1047 | /* Open kernel metadata */ | |
07b86b52 | 1048 | if (ksess->metadata == NULL && ksess->output_traces) { |
9b6c7ec5 DG |
1049 | ret = kernel_open_metadata(ksess); |
1050 | if (ret < 0) { | |
1051 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1052 | goto error; | |
1053 | } | |
1054 | } | |
1055 | ||
1056 | /* Open kernel metadata stream */ | |
07b86b52 | 1057 | if (ksess->metadata && ksess->metadata_stream_fd < 0) { |
9b6c7ec5 DG |
1058 | ret = kernel_open_metadata_stream(ksess); |
1059 | if (ret < 0) { | |
1060 | ERR("Kernel create metadata stream failed"); | |
1061 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1062 | goto error; | |
1063 | } | |
1064 | } | |
1065 | ||
1066 | /* For each channel */ | |
1067 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
1068 | if (kchan->stream_count == 0) { | |
1069 | ret = kernel_open_channel_stream(kchan); | |
1070 | if (ret < 0) { | |
1071 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1072 | goto error; | |
1073 | } | |
1074 | /* Update the stream global counter */ | |
1075 | ksess->stream_count_global += ret; | |
1076 | } | |
1077 | } | |
1078 | ||
1079 | /* Setup kernel consumer socket and send fds to it */ | |
1080 | ret = init_kernel_tracing(ksess); | |
e43c41c5 | 1081 | if (ret != 0) { |
9b6c7ec5 DG |
1082 | ret = LTTNG_ERR_KERN_START_FAIL; |
1083 | goto error; | |
1084 | } | |
1085 | ||
1086 | /* This start the kernel tracing */ | |
1087 | ret = kernel_start_session(ksess); | |
1088 | if (ret < 0) { | |
1089 | ret = LTTNG_ERR_KERN_START_FAIL; | |
1090 | goto error; | |
1091 | } | |
1092 | ||
1093 | /* Quiescent wait after starting trace */ | |
784303b0 | 1094 | kernel_wait_quiescent(kernel_tracer_fd); |
9b6c7ec5 | 1095 | |
14fb1ebe | 1096 | ksess->active = 1; |
9b6c7ec5 DG |
1097 | |
1098 | ret = LTTNG_OK; | |
1099 | ||
1100 | error: | |
1101 | return ret; | |
1102 | } | |
1103 | ||
2f77fc4b DG |
1104 | /* |
1105 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. | |
1106 | */ | |
56a37563 JG |
1107 | int cmd_disable_channel(struct ltt_session *session, |
1108 | enum lttng_domain_type domain, char *channel_name) | |
2f77fc4b DG |
1109 | { |
1110 | int ret; | |
1111 | struct ltt_ust_session *usess; | |
1112 | ||
1113 | usess = session->ust_session; | |
1114 | ||
2223c96f DG |
1115 | rcu_read_lock(); |
1116 | ||
2f77fc4b DG |
1117 | switch (domain) { |
1118 | case LTTNG_DOMAIN_KERNEL: | |
1119 | { | |
1120 | ret = channel_kernel_disable(session->kernel_session, | |
1121 | channel_name); | |
f73fabfd | 1122 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1123 | goto error; |
1124 | } | |
1125 | ||
1126 | kernel_wait_quiescent(kernel_tracer_fd); | |
1127 | break; | |
1128 | } | |
1129 | case LTTNG_DOMAIN_UST: | |
1130 | { | |
1131 | struct ltt_ust_channel *uchan; | |
1132 | struct lttng_ht *chan_ht; | |
1133 | ||
1134 | chan_ht = usess->domain_global.channels; | |
1135 | ||
1136 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
1137 | if (uchan == NULL) { | |
f73fabfd | 1138 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
1139 | goto error; |
1140 | } | |
1141 | ||
7972aab2 | 1142 | ret = channel_ust_disable(usess, uchan); |
f73fabfd | 1143 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1144 | goto error; |
1145 | } | |
1146 | break; | |
1147 | } | |
2f77fc4b | 1148 | default: |
f73fabfd | 1149 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1150 | goto error; |
1151 | } | |
1152 | ||
f73fabfd | 1153 | ret = LTTNG_OK; |
2f77fc4b DG |
1154 | |
1155 | error: | |
2223c96f | 1156 | rcu_read_unlock(); |
2f77fc4b DG |
1157 | return ret; |
1158 | } | |
1159 | ||
ccf10263 MD |
1160 | /* |
1161 | * Command LTTNG_TRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1162 | * |
1163 | * Called with session lock held. | |
ccf10263 | 1164 | */ |
56a37563 JG |
1165 | int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1166 | int pid) | |
ccf10263 MD |
1167 | { |
1168 | int ret; | |
1169 | ||
1170 | rcu_read_lock(); | |
1171 | ||
1172 | switch (domain) { | |
1173 | case LTTNG_DOMAIN_KERNEL: | |
1174 | { | |
1175 | struct ltt_kernel_session *ksess; | |
1176 | ||
1177 | ksess = session->kernel_session; | |
1178 | ||
1179 | ret = kernel_track_pid(ksess, pid); | |
1180 | if (ret != LTTNG_OK) { | |
1181 | goto error; | |
1182 | } | |
1183 | ||
1184 | kernel_wait_quiescent(kernel_tracer_fd); | |
1185 | break; | |
1186 | } | |
ccf10263 | 1187 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1188 | { |
1189 | struct ltt_ust_session *usess; | |
1190 | ||
1191 | usess = session->ust_session; | |
1192 | ||
1193 | ret = trace_ust_track_pid(usess, pid); | |
1194 | if (ret != LTTNG_OK) { | |
1195 | goto error; | |
1196 | } | |
1197 | break; | |
1198 | } | |
ccf10263 MD |
1199 | default: |
1200 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1201 | goto error; | |
1202 | } | |
1203 | ||
1204 | ret = LTTNG_OK; | |
1205 | ||
1206 | error: | |
1207 | rcu_read_unlock(); | |
1208 | return ret; | |
1209 | } | |
1210 | ||
1211 | /* | |
1212 | * Command LTTNG_UNTRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1213 | * |
1214 | * Called with session lock held. | |
ccf10263 | 1215 | */ |
56a37563 JG |
1216 | int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1217 | int pid) | |
ccf10263 MD |
1218 | { |
1219 | int ret; | |
1220 | ||
1221 | rcu_read_lock(); | |
1222 | ||
1223 | switch (domain) { | |
1224 | case LTTNG_DOMAIN_KERNEL: | |
1225 | { | |
1226 | struct ltt_kernel_session *ksess; | |
1227 | ||
1228 | ksess = session->kernel_session; | |
1229 | ||
1230 | ret = kernel_untrack_pid(ksess, pid); | |
1231 | if (ret != LTTNG_OK) { | |
1232 | goto error; | |
1233 | } | |
1234 | ||
1235 | kernel_wait_quiescent(kernel_tracer_fd); | |
1236 | break; | |
1237 | } | |
ccf10263 | 1238 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1239 | { |
1240 | struct ltt_ust_session *usess; | |
1241 | ||
1242 | usess = session->ust_session; | |
1243 | ||
1244 | ret = trace_ust_untrack_pid(usess, pid); | |
1245 | if (ret != LTTNG_OK) { | |
1246 | goto error; | |
1247 | } | |
1248 | break; | |
1249 | } | |
ccf10263 MD |
1250 | default: |
1251 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1252 | goto error; | |
1253 | } | |
1254 | ||
1255 | ret = LTTNG_OK; | |
1256 | ||
1257 | error: | |
1258 | rcu_read_unlock(); | |
1259 | return ret; | |
1260 | } | |
1261 | ||
2f77fc4b DG |
1262 | /* |
1263 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
1264 | * | |
1265 | * The wpipe arguments is used as a notifier for the kernel thread. | |
1266 | */ | |
1267 | int cmd_enable_channel(struct ltt_session *session, | |
7972aab2 | 1268 | struct lttng_domain *domain, struct lttng_channel *attr, int wpipe) |
2f77fc4b DG |
1269 | { |
1270 | int ret; | |
1271 | struct ltt_ust_session *usess = session->ust_session; | |
1272 | struct lttng_ht *chan_ht; | |
1f345e94 | 1273 | size_t len; |
2f77fc4b DG |
1274 | |
1275 | assert(session); | |
1276 | assert(attr); | |
7972aab2 | 1277 | assert(domain); |
2f77fc4b | 1278 | |
f5436bfc | 1279 | len = lttng_strnlen(attr->name, sizeof(attr->name)); |
1f345e94 PP |
1280 | |
1281 | /* Validate channel name */ | |
1282 | if (attr->name[0] == '.' || | |
1283 | memchr(attr->name, '/', len) != NULL) { | |
1284 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1285 | goto end; | |
1286 | } | |
1287 | ||
2f77fc4b DG |
1288 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
1289 | ||
03b4fdcf DG |
1290 | rcu_read_lock(); |
1291 | ||
ecc48a90 JD |
1292 | /* |
1293 | * Don't try to enable a channel if the session has been started at | |
1294 | * some point in time before. The tracer does not allow it. | |
1295 | */ | |
8382cf6f | 1296 | if (session->has_been_started) { |
ecc48a90 JD |
1297 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
1298 | goto error; | |
1299 | } | |
1300 | ||
1301 | /* | |
1302 | * If the session is a live session, remove the switch timer, the | |
1303 | * live timer does the same thing but sends also synchronisation | |
1304 | * beacons for inactive streams. | |
1305 | */ | |
1306 | if (session->live_timer > 0) { | |
1307 | attr->attr.live_timer_interval = session->live_timer; | |
1308 | attr->attr.switch_timer_interval = 0; | |
1309 | } | |
1310 | ||
33fbd469 DG |
1311 | /* |
1312 | * The ringbuffer (both in user space and kernel) behave badly in overwrite | |
1313 | * mode and with less than 2 subbuf so block it right away and send back an | |
1314 | * invalid attribute error. | |
1315 | */ | |
1316 | if (attr->attr.overwrite && attr->attr.num_subbuf < 2) { | |
1317 | ret = LTTNG_ERR_INVALID; | |
1318 | goto error; | |
1319 | } | |
1320 | ||
7972aab2 | 1321 | switch (domain->type) { |
2f77fc4b DG |
1322 | case LTTNG_DOMAIN_KERNEL: |
1323 | { | |
1324 | struct ltt_kernel_channel *kchan; | |
1325 | ||
2f77fc4b DG |
1326 | kchan = trace_kernel_get_channel_by_name(attr->name, |
1327 | session->kernel_session); | |
1328 | if (kchan == NULL) { | |
1329 | ret = channel_kernel_create(session->kernel_session, attr, wpipe); | |
85076754 MD |
1330 | if (attr->name[0] != '\0') { |
1331 | session->kernel_session->has_non_default_channel = 1; | |
1332 | } | |
2f77fc4b DG |
1333 | } else { |
1334 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
1335 | } | |
1336 | ||
f73fabfd | 1337 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1338 | goto error; |
1339 | } | |
1340 | ||
784303b0 | 1341 | kernel_wait_quiescent(kernel_tracer_fd); |
2f77fc4b DG |
1342 | break; |
1343 | } | |
1344 | case LTTNG_DOMAIN_UST: | |
9232818f JG |
1345 | case LTTNG_DOMAIN_JUL: |
1346 | case LTTNG_DOMAIN_LOG4J: | |
1347 | case LTTNG_DOMAIN_PYTHON: | |
2f77fc4b DG |
1348 | { |
1349 | struct ltt_ust_channel *uchan; | |
1350 | ||
9232818f JG |
1351 | /* |
1352 | * FIXME | |
1353 | * | |
1354 | * Current agent implementation limitations force us to allow | |
1355 | * only one channel at once in "agent" subdomains. Each | |
1356 | * subdomain has a default channel name which must be strictly | |
1357 | * adhered to. | |
1358 | */ | |
1359 | if (domain->type == LTTNG_DOMAIN_JUL) { | |
1360 | if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME, | |
1361 | LTTNG_SYMBOL_NAME_LEN)) { | |
1362 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1363 | goto error; | |
1364 | } | |
1365 | } else if (domain->type == LTTNG_DOMAIN_LOG4J) { | |
1366 | if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME, | |
1367 | LTTNG_SYMBOL_NAME_LEN)) { | |
1368 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1369 | goto error; | |
1370 | } | |
1371 | } else if (domain->type == LTTNG_DOMAIN_PYTHON) { | |
1372 | if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME, | |
1373 | LTTNG_SYMBOL_NAME_LEN)) { | |
1374 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1375 | goto error; | |
1376 | } | |
1377 | } | |
1378 | ||
2f77fc4b DG |
1379 | chan_ht = usess->domain_global.channels; |
1380 | ||
1381 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); | |
1382 | if (uchan == NULL) { | |
7972aab2 | 1383 | ret = channel_ust_create(usess, attr, domain->buf_type); |
85076754 MD |
1384 | if (attr->name[0] != '\0') { |
1385 | usess->has_non_default_channel = 1; | |
1386 | } | |
2f77fc4b | 1387 | } else { |
7972aab2 | 1388 | ret = channel_ust_enable(usess, uchan); |
2f77fc4b DG |
1389 | } |
1390 | break; | |
1391 | } | |
2f77fc4b | 1392 | default: |
f73fabfd | 1393 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1394 | goto error; |
1395 | } | |
1396 | ||
1397 | error: | |
2223c96f | 1398 | rcu_read_unlock(); |
1f345e94 | 1399 | end: |
2f77fc4b DG |
1400 | return ret; |
1401 | } | |
1402 | ||
2f77fc4b DG |
1403 | /* |
1404 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1405 | */ | |
56a37563 JG |
1406 | int cmd_disable_event(struct ltt_session *session, |
1407 | enum lttng_domain_type domain, char *channel_name, | |
6e911cad | 1408 | struct lttng_event *event) |
2f77fc4b DG |
1409 | { |
1410 | int ret; | |
6e911cad MD |
1411 | char *event_name; |
1412 | ||
18a720cd MD |
1413 | DBG("Disable event command for event \'%s\'", event->name); |
1414 | ||
6e911cad | 1415 | event_name = event->name; |
7076b56e JG |
1416 | if (validate_event_name(event_name)) { |
1417 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1418 | goto error; | |
1419 | } | |
6e911cad | 1420 | |
9b7431cf JG |
1421 | /* Error out on unhandled search criteria */ |
1422 | if (event->loglevel_type || event->loglevel != -1 || event->enabled | |
6e911cad | 1423 | || event->pid || event->filter || event->exclusion) { |
7076b56e JG |
1424 | ret = LTTNG_ERR_UNK; |
1425 | goto error; | |
6e911cad | 1426 | } |
2f77fc4b | 1427 | |
2223c96f DG |
1428 | rcu_read_lock(); |
1429 | ||
2f77fc4b DG |
1430 | switch (domain) { |
1431 | case LTTNG_DOMAIN_KERNEL: | |
1432 | { | |
1433 | struct ltt_kernel_channel *kchan; | |
1434 | struct ltt_kernel_session *ksess; | |
1435 | ||
1436 | ksess = session->kernel_session; | |
1437 | ||
85076754 MD |
1438 | /* |
1439 | * If a non-default channel has been created in the | |
1440 | * session, explicitely require that -c chan_name needs | |
1441 | * to be provided. | |
1442 | */ | |
1443 | if (ksess->has_non_default_channel && channel_name[0] == '\0') { | |
1444 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1445 | goto error_unlock; |
85076754 MD |
1446 | } |
1447 | ||
2f77fc4b DG |
1448 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
1449 | if (kchan == NULL) { | |
f73fabfd | 1450 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
7076b56e | 1451 | goto error_unlock; |
2f77fc4b DG |
1452 | } |
1453 | ||
6e911cad MD |
1454 | switch (event->type) { |
1455 | case LTTNG_EVENT_ALL: | |
9550ee81 | 1456 | case LTTNG_EVENT_TRACEPOINT: |
d0ae4ea8 | 1457 | case LTTNG_EVENT_SYSCALL: |
9550ee81 JR |
1458 | case LTTNG_EVENT_PROBE: |
1459 | case LTTNG_EVENT_FUNCTION: | |
1460 | case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */ | |
1461 | if (event_name[0] == '\0') { | |
1462 | ret = event_kernel_disable_event(kchan, | |
1463 | NULL, event->type); | |
29c62722 | 1464 | } else { |
d0ae4ea8 | 1465 | ret = event_kernel_disable_event(kchan, |
9550ee81 | 1466 | event_name, event->type); |
29c62722 | 1467 | } |
6e911cad | 1468 | if (ret != LTTNG_OK) { |
7076b56e | 1469 | goto error_unlock; |
6e911cad MD |
1470 | } |
1471 | break; | |
6e911cad MD |
1472 | default: |
1473 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1474 | goto error_unlock; |
2f77fc4b DG |
1475 | } |
1476 | ||
1477 | kernel_wait_quiescent(kernel_tracer_fd); | |
1478 | break; | |
1479 | } | |
1480 | case LTTNG_DOMAIN_UST: | |
1481 | { | |
1482 | struct ltt_ust_channel *uchan; | |
1483 | struct ltt_ust_session *usess; | |
1484 | ||
1485 | usess = session->ust_session; | |
1486 | ||
7076b56e JG |
1487 | if (validate_ust_event_name(event_name)) { |
1488 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1489 | goto error_unlock; | |
1490 | } | |
1491 | ||
85076754 MD |
1492 | /* |
1493 | * If a non-default channel has been created in the | |
9550ee81 | 1494 | * session, explicitly require that -c chan_name needs |
85076754 MD |
1495 | * to be provided. |
1496 | */ | |
1497 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1498 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1499 | goto error_unlock; |
85076754 MD |
1500 | } |
1501 | ||
2f77fc4b DG |
1502 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
1503 | channel_name); | |
1504 | if (uchan == NULL) { | |
f73fabfd | 1505 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
7076b56e | 1506 | goto error_unlock; |
2f77fc4b DG |
1507 | } |
1508 | ||
6e911cad MD |
1509 | switch (event->type) { |
1510 | case LTTNG_EVENT_ALL: | |
b3639870 JR |
1511 | /* |
1512 | * An empty event name means that everything | |
1513 | * should be disabled. | |
1514 | */ | |
1515 | if (event->name[0] == '\0') { | |
1516 | ret = event_ust_disable_all_tracepoints(usess, uchan); | |
77d536b2 JR |
1517 | } else { |
1518 | ret = event_ust_disable_tracepoint(usess, uchan, | |
1519 | event_name); | |
1520 | } | |
6e911cad | 1521 | if (ret != LTTNG_OK) { |
7076b56e | 1522 | goto error_unlock; |
6e911cad MD |
1523 | } |
1524 | break; | |
1525 | default: | |
1526 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1527 | goto error_unlock; |
2f77fc4b DG |
1528 | } |
1529 | ||
1530 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
1531 | channel_name); | |
1532 | break; | |
1533 | } | |
5cdb6027 | 1534 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1535 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1536 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1537 | { |
fefd409b | 1538 | struct agent *agt; |
f20baf8e DG |
1539 | struct ltt_ust_session *usess = session->ust_session; |
1540 | ||
1541 | assert(usess); | |
1542 | ||
6e911cad MD |
1543 | switch (event->type) { |
1544 | case LTTNG_EVENT_ALL: | |
1545 | break; | |
1546 | default: | |
1547 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1548 | goto error_unlock; |
6e911cad MD |
1549 | } |
1550 | ||
5cdb6027 | 1551 | agt = trace_ust_find_agent(usess, domain); |
fefd409b DG |
1552 | if (!agt) { |
1553 | ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
7076b56e | 1554 | goto error_unlock; |
fefd409b | 1555 | } |
b3639870 JR |
1556 | /* |
1557 | * An empty event name means that everything | |
1558 | * should be disabled. | |
1559 | */ | |
1560 | if (event->name[0] == '\0') { | |
18a720cd MD |
1561 | ret = event_agent_disable_all(usess, agt); |
1562 | } else { | |
1563 | ret = event_agent_disable(usess, agt, event_name); | |
1564 | } | |
f20baf8e | 1565 | if (ret != LTTNG_OK) { |
7076b56e | 1566 | goto error_unlock; |
f20baf8e DG |
1567 | } |
1568 | ||
1569 | break; | |
1570 | } | |
2f77fc4b | 1571 | default: |
f73fabfd | 1572 | ret = LTTNG_ERR_UND; |
7076b56e | 1573 | goto error_unlock; |
2f77fc4b DG |
1574 | } |
1575 | ||
f73fabfd | 1576 | ret = LTTNG_OK; |
2f77fc4b | 1577 | |
7076b56e | 1578 | error_unlock: |
2223c96f | 1579 | rcu_read_unlock(); |
7076b56e | 1580 | error: |
2f77fc4b DG |
1581 | return ret; |
1582 | } | |
1583 | ||
2f77fc4b DG |
1584 | /* |
1585 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1586 | */ | |
56a37563 | 1587 | int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain, |
601d5acf | 1588 | char *channel_name, struct lttng_event_context *ctx, int kwpipe) |
2f77fc4b | 1589 | { |
d5979e4a | 1590 | int ret, chan_kern_created = 0, chan_ust_created = 0; |
bdf64013 JG |
1591 | char *app_ctx_provider_name = NULL, *app_ctx_name = NULL; |
1592 | ||
1593 | if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
1594 | app_ctx_provider_name = ctx->u.app_ctx.provider_name; | |
1595 | app_ctx_name = ctx->u.app_ctx.ctx_name; | |
1596 | } | |
2f77fc4b DG |
1597 | |
1598 | switch (domain) { | |
1599 | case LTTNG_DOMAIN_KERNEL: | |
979e618e DG |
1600 | assert(session->kernel_session); |
1601 | ||
1602 | if (session->kernel_session->channel_count == 0) { | |
1603 | /* Create default channel */ | |
1604 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); | |
1605 | if (ret != LTTNG_OK) { | |
1606 | goto error; | |
1607 | } | |
d5979e4a | 1608 | chan_kern_created = 1; |
979e618e | 1609 | } |
2f77fc4b | 1610 | /* Add kernel context to kernel tracer */ |
601d5acf | 1611 | ret = context_kernel_add(session->kernel_session, ctx, channel_name); |
f73fabfd | 1612 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1613 | goto error; |
1614 | } | |
1615 | break; | |
bdf64013 JG |
1616 | case LTTNG_DOMAIN_JUL: |
1617 | case LTTNG_DOMAIN_LOG4J: | |
1618 | { | |
1619 | /* | |
1620 | * Validate channel name. | |
1621 | * If no channel name is given and the domain is JUL or LOG4J, | |
1622 | * set it to the appropriate domain-specific channel name. If | |
1623 | * a name is provided but does not match the expexted channel | |
1624 | * name, return an error. | |
1625 | */ | |
1626 | if (domain == LTTNG_DOMAIN_JUL && *channel_name && | |
1627 | strcmp(channel_name, | |
1628 | DEFAULT_JUL_CHANNEL_NAME)) { | |
1629 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1630 | goto error; | |
1631 | } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name && | |
1632 | strcmp(channel_name, | |
1633 | DEFAULT_LOG4J_CHANNEL_NAME)) { | |
1634 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1635 | goto error; | |
1636 | } | |
a93b3916 | 1637 | /* break is _not_ missing here. */ |
bdf64013 | 1638 | } |
2f77fc4b DG |
1639 | case LTTNG_DOMAIN_UST: |
1640 | { | |
1641 | struct ltt_ust_session *usess = session->ust_session; | |
85076754 MD |
1642 | unsigned int chan_count; |
1643 | ||
2f77fc4b DG |
1644 | assert(usess); |
1645 | ||
85076754 | 1646 | chan_count = lttng_ht_get_count(usess->domain_global.channels); |
979e618e DG |
1647 | if (chan_count == 0) { |
1648 | struct lttng_channel *attr; | |
1649 | /* Create default channel */ | |
0a9c6494 | 1650 | attr = channel_new_default_attr(domain, usess->buffer_type); |
979e618e DG |
1651 | if (attr == NULL) { |
1652 | ret = LTTNG_ERR_FATAL; | |
1653 | goto error; | |
1654 | } | |
1655 | ||
7972aab2 | 1656 | ret = channel_ust_create(usess, attr, usess->buffer_type); |
979e618e DG |
1657 | if (ret != LTTNG_OK) { |
1658 | free(attr); | |
1659 | goto error; | |
1660 | } | |
1661 | free(attr); | |
d5979e4a | 1662 | chan_ust_created = 1; |
979e618e DG |
1663 | } |
1664 | ||
601d5acf | 1665 | ret = context_ust_add(usess, domain, ctx, channel_name); |
bdf64013 JG |
1666 | free(app_ctx_provider_name); |
1667 | free(app_ctx_name); | |
1668 | app_ctx_name = NULL; | |
1669 | app_ctx_provider_name = NULL; | |
f73fabfd | 1670 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1671 | goto error; |
1672 | } | |
1673 | break; | |
1674 | } | |
2f77fc4b | 1675 | default: |
f73fabfd | 1676 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1677 | goto error; |
1678 | } | |
1679 | ||
bdf64013 JG |
1680 | ret = LTTNG_OK; |
1681 | goto end; | |
2f77fc4b DG |
1682 | |
1683 | error: | |
d5979e4a DG |
1684 | if (chan_kern_created) { |
1685 | struct ltt_kernel_channel *kchan = | |
1686 | trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME, | |
1687 | session->kernel_session); | |
1688 | /* Created previously, this should NOT fail. */ | |
1689 | assert(kchan); | |
1690 | kernel_destroy_channel(kchan); | |
1691 | } | |
1692 | ||
1693 | if (chan_ust_created) { | |
1694 | struct ltt_ust_channel *uchan = | |
1695 | trace_ust_find_channel_by_name( | |
1696 | session->ust_session->domain_global.channels, | |
1697 | DEFAULT_CHANNEL_NAME); | |
1698 | /* Created previously, this should NOT fail. */ | |
1699 | assert(uchan); | |
1700 | /* Remove from the channel list of the session. */ | |
1701 | trace_ust_delete_channel(session->ust_session->domain_global.channels, | |
1702 | uchan); | |
1703 | trace_ust_destroy_channel(uchan); | |
1704 | } | |
bdf64013 JG |
1705 | end: |
1706 | free(app_ctx_provider_name); | |
1707 | free(app_ctx_name); | |
2f77fc4b DG |
1708 | return ret; |
1709 | } | |
1710 | ||
930a2e99 JG |
1711 | static int validate_event_name(const char *name) |
1712 | { | |
1713 | int ret = 0; | |
1714 | const char *c = name; | |
1715 | const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN; | |
bf9807db | 1716 | bool null_terminated = false; |
930a2e99 JG |
1717 | |
1718 | /* | |
1719 | * Make sure that unescaped wildcards are only used as the last | |
1720 | * character of the event name. | |
1721 | */ | |
1722 | while (c < event_name_end) { | |
1723 | switch (*c) { | |
1724 | case '\0': | |
bf9807db | 1725 | null_terminated = true; |
930a2e99 JG |
1726 | goto end; |
1727 | case '\\': | |
1728 | c++; | |
1729 | break; | |
1730 | case '*': | |
1731 | if ((c + 1) < event_name_end && *(c + 1)) { | |
1732 | /* Wildcard is not the last character */ | |
1733 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1734 | goto end; | |
1735 | } | |
1736 | default: | |
1737 | break; | |
1738 | } | |
1739 | c++; | |
1740 | } | |
1741 | end: | |
bf9807db JG |
1742 | if (!ret && !null_terminated) { |
1743 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1744 | } | |
930a2e99 JG |
1745 | return ret; |
1746 | } | |
1747 | ||
dac8e046 JG |
1748 | static inline bool name_starts_with(const char *name, const char *prefix) |
1749 | { | |
1750 | const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN); | |
1751 | ||
1752 | return !strncmp(name, prefix, max_cmp_len); | |
1753 | } | |
1754 | ||
1755 | /* Perform userspace-specific event name validation */ | |
1756 | static int validate_ust_event_name(const char *name) | |
1757 | { | |
1758 | int ret = 0; | |
1759 | ||
1760 | if (!name) { | |
1761 | ret = -1; | |
1762 | goto end; | |
1763 | } | |
1764 | ||
1765 | /* | |
1766 | * Check name against all internal UST event component namespaces used | |
1767 | * by the agents. | |
1768 | */ | |
1769 | if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) || | |
1770 | name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) || | |
1771 | name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) { | |
1772 | ret = -1; | |
1773 | } | |
1774 | ||
1775 | end: | |
1776 | return ret; | |
1777 | } | |
88f06f15 | 1778 | |
2f77fc4b | 1779 | /* |
88f06f15 JG |
1780 | * Internal version of cmd_enable_event() with a supplemental |
1781 | * "internal_event" flag which is used to enable internal events which should | |
1782 | * be hidden from clients. Such events are used in the agent implementation to | |
1783 | * enable the events through which all "agent" events are funeled. | |
2f77fc4b | 1784 | */ |
88f06f15 JG |
1785 | static int _cmd_enable_event(struct ltt_session *session, |
1786 | struct lttng_domain *domain, | |
025faf73 | 1787 | char *channel_name, struct lttng_event *event, |
6b453b5e | 1788 | char *filter_expression, |
db8f1377 JI |
1789 | struct lttng_filter_bytecode *filter, |
1790 | struct lttng_event_exclusion *exclusion, | |
88f06f15 | 1791 | int wpipe, bool internal_event) |
2f77fc4b | 1792 | { |
e5f5db7f | 1793 | int ret, channel_created = 0; |
2f77fc4b DG |
1794 | struct lttng_channel *attr; |
1795 | ||
1796 | assert(session); | |
1797 | assert(event); | |
1798 | assert(channel_name); | |
1799 | ||
2a385866 JG |
1800 | /* If we have a filter, we must have its filter expression */ |
1801 | assert(!(!!filter_expression ^ !!filter)); | |
1802 | ||
18a720cd MD |
1803 | DBG("Enable event command for event \'%s\'", event->name); |
1804 | ||
f5ac4bd7 MD |
1805 | rcu_read_lock(); |
1806 | ||
930a2e99 JG |
1807 | ret = validate_event_name(event->name); |
1808 | if (ret) { | |
1809 | goto error; | |
1810 | } | |
1811 | ||
7972aab2 | 1812 | switch (domain->type) { |
2f77fc4b DG |
1813 | case LTTNG_DOMAIN_KERNEL: |
1814 | { | |
1815 | struct ltt_kernel_channel *kchan; | |
1816 | ||
85076754 MD |
1817 | /* |
1818 | * If a non-default channel has been created in the | |
1819 | * session, explicitely require that -c chan_name needs | |
1820 | * to be provided. | |
1821 | */ | |
1822 | if (session->kernel_session->has_non_default_channel | |
1823 | && channel_name[0] == '\0') { | |
1824 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1825 | goto error; | |
1826 | } | |
1827 | ||
2f77fc4b DG |
1828 | kchan = trace_kernel_get_channel_by_name(channel_name, |
1829 | session->kernel_session); | |
1830 | if (kchan == NULL) { | |
0a9c6494 DG |
1831 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
1832 | LTTNG_BUFFER_GLOBAL); | |
2f77fc4b | 1833 | if (attr == NULL) { |
f73fabfd | 1834 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1835 | goto error; |
1836 | } | |
1837 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1838 | ||
1839 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1840 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1841 | free(attr); |
1842 | goto error; | |
1843 | } | |
1844 | free(attr); | |
e5f5db7f DG |
1845 | |
1846 | channel_created = 1; | |
2f77fc4b DG |
1847 | } |
1848 | ||
1849 | /* Get the newly created kernel channel pointer */ | |
1850 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1851 | session->kernel_session); | |
1852 | if (kchan == NULL) { | |
1853 | /* This sould not happen... */ | |
f73fabfd | 1854 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1855 | goto error; |
1856 | } | |
1857 | ||
6e911cad MD |
1858 | switch (event->type) { |
1859 | case LTTNG_EVENT_ALL: | |
29c62722 | 1860 | { |
00a62084 MD |
1861 | char *filter_expression_a = NULL; |
1862 | struct lttng_filter_bytecode *filter_a = NULL; | |
1863 | ||
1864 | /* | |
1865 | * We need to duplicate filter_expression and filter, | |
1866 | * because ownership is passed to first enable | |
1867 | * event. | |
1868 | */ | |
1869 | if (filter_expression) { | |
1870 | filter_expression_a = strdup(filter_expression); | |
1871 | if (!filter_expression_a) { | |
1872 | ret = LTTNG_ERR_FATAL; | |
1873 | goto error; | |
1874 | } | |
1875 | } | |
1876 | if (filter) { | |
1877 | filter_a = zmalloc(sizeof(*filter_a) + filter->len); | |
1878 | if (!filter_a) { | |
1879 | free(filter_expression_a); | |
1880 | ret = LTTNG_ERR_FATAL; | |
1881 | goto error; | |
1882 | } | |
1883 | memcpy(filter_a, filter, sizeof(*filter_a) + filter->len); | |
1884 | } | |
29c62722 | 1885 | event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */ |
00a62084 MD |
1886 | ret = event_kernel_enable_event(kchan, event, |
1887 | filter_expression, filter); | |
a969e101 MD |
1888 | /* We have passed ownership */ |
1889 | filter_expression = NULL; | |
1890 | filter = NULL; | |
29c62722 MD |
1891 | if (ret != LTTNG_OK) { |
1892 | if (channel_created) { | |
1893 | /* Let's not leak a useless channel. */ | |
1894 | kernel_destroy_channel(kchan); | |
1895 | } | |
00a62084 MD |
1896 | free(filter_expression_a); |
1897 | free(filter_a); | |
29c62722 MD |
1898 | goto error; |
1899 | } | |
1900 | event->type = LTTNG_EVENT_SYSCALL; /* Hack */ | |
00a62084 MD |
1901 | ret = event_kernel_enable_event(kchan, event, |
1902 | filter_expression_a, filter_a); | |
60d21fa2 AB |
1903 | /* We have passed ownership */ |
1904 | filter_expression_a = NULL; | |
1905 | filter_a = NULL; | |
29c62722 MD |
1906 | if (ret != LTTNG_OK) { |
1907 | goto error; | |
1908 | } | |
1909 | break; | |
1910 | } | |
6e6ef3d7 DG |
1911 | case LTTNG_EVENT_PROBE: |
1912 | case LTTNG_EVENT_FUNCTION: | |
1913 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
6e911cad | 1914 | case LTTNG_EVENT_TRACEPOINT: |
00a62084 MD |
1915 | ret = event_kernel_enable_event(kchan, event, |
1916 | filter_expression, filter); | |
a969e101 MD |
1917 | /* We have passed ownership */ |
1918 | filter_expression = NULL; | |
1919 | filter = NULL; | |
6e911cad MD |
1920 | if (ret != LTTNG_OK) { |
1921 | if (channel_created) { | |
1922 | /* Let's not leak a useless channel. */ | |
1923 | kernel_destroy_channel(kchan); | |
1924 | } | |
1925 | goto error; | |
e5f5db7f | 1926 | } |
6e911cad MD |
1927 | break; |
1928 | case LTTNG_EVENT_SYSCALL: | |
00a62084 MD |
1929 | ret = event_kernel_enable_event(kchan, event, |
1930 | filter_expression, filter); | |
a969e101 MD |
1931 | /* We have passed ownership */ |
1932 | filter_expression = NULL; | |
1933 | filter = NULL; | |
e2b957af MD |
1934 | if (ret != LTTNG_OK) { |
1935 | goto error; | |
1936 | } | |
6e911cad MD |
1937 | break; |
1938 | default: | |
1939 | ret = LTTNG_ERR_UNK; | |
2f77fc4b DG |
1940 | goto error; |
1941 | } | |
1942 | ||
1943 | kernel_wait_quiescent(kernel_tracer_fd); | |
1944 | break; | |
1945 | } | |
1946 | case LTTNG_DOMAIN_UST: | |
1947 | { | |
1948 | struct ltt_ust_channel *uchan; | |
1949 | struct ltt_ust_session *usess = session->ust_session; | |
1950 | ||
1951 | assert(usess); | |
1952 | ||
85076754 MD |
1953 | /* |
1954 | * If a non-default channel has been created in the | |
1955 | * session, explicitely require that -c chan_name needs | |
1956 | * to be provided. | |
1957 | */ | |
1958 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1959 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1960 | goto error; | |
1961 | } | |
1962 | ||
2f77fc4b DG |
1963 | /* Get channel from global UST domain */ |
1964 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
1965 | channel_name); | |
1966 | if (uchan == NULL) { | |
1967 | /* Create default channel */ | |
0a9c6494 DG |
1968 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
1969 | usess->buffer_type); | |
2f77fc4b | 1970 | if (attr == NULL) { |
f73fabfd | 1971 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1972 | goto error; |
1973 | } | |
1974 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1975 | ||
1976 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1977 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1978 | free(attr); |
1979 | goto error; | |
1980 | } | |
1981 | free(attr); | |
1982 | ||
1983 | /* Get the newly created channel reference back */ | |
1984 | uchan = trace_ust_find_channel_by_name( | |
1985 | usess->domain_global.channels, channel_name); | |
1986 | assert(uchan); | |
1987 | } | |
1988 | ||
141feb8c JG |
1989 | if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) { |
1990 | /* | |
1991 | * Don't allow users to add UST events to channels which | |
1992 | * are assigned to a userspace subdomain (JUL, Log4J, | |
1993 | * Python, etc.). | |
1994 | */ | |
1995 | ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN; | |
1996 | goto error; | |
1997 | } | |
1998 | ||
dac8e046 JG |
1999 | if (!internal_event) { |
2000 | /* | |
2001 | * Ensure the event name is not reserved for internal | |
2002 | * use. | |
2003 | */ | |
2004 | ret = validate_ust_event_name(event->name); | |
2005 | if (ret) { | |
2006 | WARN("Userspace event name %s failed validation.", | |
2007 | event->name ? | |
2008 | event->name : "NULL"); | |
2009 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
2010 | goto error; | |
2011 | } | |
2012 | } | |
2013 | ||
2f77fc4b | 2014 | /* At this point, the session and channel exist on the tracer */ |
6b453b5e | 2015 | ret = event_ust_enable_tracepoint(usess, uchan, event, |
88f06f15 JG |
2016 | filter_expression, filter, exclusion, |
2017 | internal_event); | |
49d21f93 MD |
2018 | /* We have passed ownership */ |
2019 | filter_expression = NULL; | |
2020 | filter = NULL; | |
2021 | exclusion = NULL; | |
94382e15 JG |
2022 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2023 | goto already_enabled; | |
2024 | } else if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2025 | goto error; |
2026 | } | |
2027 | break; | |
2028 | } | |
5cdb6027 | 2029 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 2030 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2031 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 2032 | { |
da6c3a50 | 2033 | const char *default_event_name, *default_chan_name; |
fefd409b | 2034 | struct agent *agt; |
f20baf8e DG |
2035 | struct lttng_event uevent; |
2036 | struct lttng_domain tmp_dom; | |
2037 | struct ltt_ust_session *usess = session->ust_session; | |
2038 | ||
2039 | assert(usess); | |
2040 | ||
5cdb6027 | 2041 | agt = trace_ust_find_agent(usess, domain->type); |
fefd409b | 2042 | if (!agt) { |
5cdb6027 | 2043 | agt = agent_create(domain->type); |
fefd409b | 2044 | if (!agt) { |
e5b3c48c | 2045 | ret = LTTNG_ERR_NOMEM; |
fefd409b DG |
2046 | goto error; |
2047 | } | |
2048 | agent_add(agt, usess->agents); | |
2049 | } | |
2050 | ||
022d91ba | 2051 | /* Create the default tracepoint. */ |
996de3c7 | 2052 | memset(&uevent, 0, sizeof(uevent)); |
f20baf8e DG |
2053 | uevent.type = LTTNG_EVENT_TRACEPOINT; |
2054 | uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
51755dc8 JG |
2055 | default_event_name = event_get_default_agent_ust_name( |
2056 | domain->type); | |
da6c3a50 | 2057 | if (!default_event_name) { |
e5b3c48c | 2058 | ret = LTTNG_ERR_FATAL; |
da6c3a50 | 2059 | goto error; |
f43f95a9 | 2060 | } |
da6c3a50 | 2061 | strncpy(uevent.name, default_event_name, sizeof(uevent.name)); |
f20baf8e DG |
2062 | uevent.name[sizeof(uevent.name) - 1] = '\0'; |
2063 | ||
2064 | /* | |
2065 | * The domain type is changed because we are about to enable the | |
2066 | * default channel and event for the JUL domain that are hardcoded. | |
2067 | * This happens in the UST domain. | |
2068 | */ | |
2069 | memcpy(&tmp_dom, domain, sizeof(tmp_dom)); | |
2070 | tmp_dom.type = LTTNG_DOMAIN_UST; | |
2071 | ||
0e115563 DG |
2072 | switch (domain->type) { |
2073 | case LTTNG_DOMAIN_LOG4J: | |
da6c3a50 | 2074 | default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME; |
0e115563 DG |
2075 | break; |
2076 | case LTTNG_DOMAIN_JUL: | |
da6c3a50 | 2077 | default_chan_name = DEFAULT_JUL_CHANNEL_NAME; |
0e115563 DG |
2078 | break; |
2079 | case LTTNG_DOMAIN_PYTHON: | |
2080 | default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
2081 | break; | |
2082 | default: | |
e98a44b0 | 2083 | /* The switch/case we are in makes this impossible */ |
0e115563 | 2084 | assert(0); |
da6c3a50 DG |
2085 | } |
2086 | ||
971da06a | 2087 | { |
8404118c | 2088 | char *filter_expression_copy = NULL; |
51755dc8 | 2089 | struct lttng_filter_bytecode *filter_copy = NULL; |
971da06a JG |
2090 | |
2091 | if (filter) { | |
51755dc8 JG |
2092 | const size_t filter_size = sizeof( |
2093 | struct lttng_filter_bytecode) | |
2094 | + filter->len; | |
2095 | ||
2096 | filter_copy = zmalloc(filter_size); | |
971da06a | 2097 | if (!filter_copy) { |
018096a4 | 2098 | ret = LTTNG_ERR_NOMEM; |
b742e3e2 | 2099 | goto error; |
971da06a | 2100 | } |
51755dc8 | 2101 | memcpy(filter_copy, filter, filter_size); |
971da06a | 2102 | |
8404118c JG |
2103 | filter_expression_copy = |
2104 | strdup(filter_expression); | |
2105 | if (!filter_expression) { | |
2106 | ret = LTTNG_ERR_NOMEM; | |
51755dc8 JG |
2107 | } |
2108 | ||
2109 | if (!filter_expression_copy || !filter_copy) { | |
2110 | free(filter_expression_copy); | |
2111 | free(filter_copy); | |
2112 | goto error; | |
8404118c | 2113 | } |
971da06a JG |
2114 | } |
2115 | ||
88f06f15 | 2116 | ret = cmd_enable_event_internal(session, &tmp_dom, |
971da06a | 2117 | (char *) default_chan_name, |
8404118c JG |
2118 | &uevent, filter_expression_copy, |
2119 | filter_copy, NULL, wpipe); | |
971da06a JG |
2120 | } |
2121 | ||
94382e15 JG |
2122 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2123 | goto already_enabled; | |
2124 | } else if (ret != LTTNG_OK) { | |
f20baf8e DG |
2125 | goto error; |
2126 | } | |
2127 | ||
2128 | /* The wild card * means that everything should be enabled. */ | |
2129 | if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) { | |
8404118c JG |
2130 | ret = event_agent_enable_all(usess, agt, event, filter, |
2131 | filter_expression); | |
f20baf8e | 2132 | } else { |
8404118c JG |
2133 | ret = event_agent_enable(usess, agt, event, filter, |
2134 | filter_expression); | |
f20baf8e | 2135 | } |
51755dc8 JG |
2136 | filter = NULL; |
2137 | filter_expression = NULL; | |
f20baf8e DG |
2138 | if (ret != LTTNG_OK) { |
2139 | goto error; | |
2140 | } | |
2141 | ||
2142 | break; | |
2143 | } | |
2f77fc4b | 2144 | default: |
f73fabfd | 2145 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2146 | goto error; |
2147 | } | |
2148 | ||
f73fabfd | 2149 | ret = LTTNG_OK; |
2f77fc4b | 2150 | |
94382e15 | 2151 | already_enabled: |
2f77fc4b | 2152 | error: |
49d21f93 MD |
2153 | free(filter_expression); |
2154 | free(filter); | |
2155 | free(exclusion); | |
2223c96f | 2156 | rcu_read_unlock(); |
2f77fc4b DG |
2157 | return ret; |
2158 | } | |
2159 | ||
88f06f15 JG |
2160 | /* |
2161 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2162 | * We own filter, exclusion, and filter_expression. | |
2163 | */ | |
2164 | int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain, | |
2165 | char *channel_name, struct lttng_event *event, | |
2166 | char *filter_expression, | |
2167 | struct lttng_filter_bytecode *filter, | |
2168 | struct lttng_event_exclusion *exclusion, | |
2169 | int wpipe) | |
2170 | { | |
2171 | return _cmd_enable_event(session, domain, channel_name, event, | |
2172 | filter_expression, filter, exclusion, wpipe, false); | |
2173 | } | |
2174 | ||
2175 | /* | |
2176 | * Enable an event which is internal to LTTng. An internal should | |
2177 | * never be made visible to clients and are immune to checks such as | |
2178 | * reserved names. | |
2179 | */ | |
2180 | static int cmd_enable_event_internal(struct ltt_session *session, | |
2181 | struct lttng_domain *domain, | |
2182 | char *channel_name, struct lttng_event *event, | |
2183 | char *filter_expression, | |
2184 | struct lttng_filter_bytecode *filter, | |
2185 | struct lttng_event_exclusion *exclusion, | |
2186 | int wpipe) | |
2187 | { | |
2188 | return _cmd_enable_event(session, domain, channel_name, event, | |
2189 | filter_expression, filter, exclusion, wpipe, true); | |
2190 | } | |
2191 | ||
2f77fc4b DG |
2192 | /* |
2193 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2194 | */ | |
56a37563 JG |
2195 | ssize_t cmd_list_tracepoints(enum lttng_domain_type domain, |
2196 | struct lttng_event **events) | |
2f77fc4b DG |
2197 | { |
2198 | int ret; | |
2199 | ssize_t nb_events = 0; | |
2200 | ||
2201 | switch (domain) { | |
2202 | case LTTNG_DOMAIN_KERNEL: | |
2203 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2204 | if (nb_events < 0) { | |
f73fabfd | 2205 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
2f77fc4b DG |
2206 | goto error; |
2207 | } | |
2208 | break; | |
2209 | case LTTNG_DOMAIN_UST: | |
2210 | nb_events = ust_app_list_events(events); | |
2211 | if (nb_events < 0) { | |
f73fabfd | 2212 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2213 | goto error; |
2214 | } | |
2215 | break; | |
5cdb6027 | 2216 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2217 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2218 | case LTTNG_DOMAIN_PYTHON: |
f60140a1 | 2219 | nb_events = agent_list_events(events, domain); |
3c6a091f DG |
2220 | if (nb_events < 0) { |
2221 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2222 | goto error; | |
2223 | } | |
2224 | break; | |
2f77fc4b | 2225 | default: |
f73fabfd | 2226 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2227 | goto error; |
2228 | } | |
2229 | ||
2230 | return nb_events; | |
2231 | ||
2232 | error: | |
2233 | /* Return negative value to differentiate return code */ | |
2234 | return -ret; | |
2235 | } | |
2236 | ||
2237 | /* | |
2238 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
2239 | */ | |
56a37563 | 2240 | ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain, |
2f77fc4b DG |
2241 | struct lttng_event_field **fields) |
2242 | { | |
2243 | int ret; | |
2244 | ssize_t nb_fields = 0; | |
2245 | ||
2246 | switch (domain) { | |
2247 | case LTTNG_DOMAIN_UST: | |
2248 | nb_fields = ust_app_list_event_fields(fields); | |
2249 | if (nb_fields < 0) { | |
f73fabfd | 2250 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2251 | goto error; |
2252 | } | |
2253 | break; | |
2254 | case LTTNG_DOMAIN_KERNEL: | |
2255 | default: /* fall-through */ | |
f73fabfd | 2256 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2257 | goto error; |
2258 | } | |
2259 | ||
2260 | return nb_fields; | |
2261 | ||
2262 | error: | |
2263 | /* Return negative value to differentiate return code */ | |
2264 | return -ret; | |
2265 | } | |
2266 | ||
834978fd DG |
2267 | ssize_t cmd_list_syscalls(struct lttng_event **events) |
2268 | { | |
2269 | return syscall_table_list(events); | |
2270 | } | |
2271 | ||
a5dfbb9d MD |
2272 | /* |
2273 | * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread. | |
2274 | * | |
2275 | * Called with session lock held. | |
2276 | */ | |
2277 | ssize_t cmd_list_tracker_pids(struct ltt_session *session, | |
56a37563 | 2278 | enum lttng_domain_type domain, int32_t **pids) |
a5dfbb9d MD |
2279 | { |
2280 | int ret; | |
2281 | ssize_t nr_pids = 0; | |
2282 | ||
2283 | switch (domain) { | |
2284 | case LTTNG_DOMAIN_KERNEL: | |
2285 | { | |
2286 | struct ltt_kernel_session *ksess; | |
2287 | ||
2288 | ksess = session->kernel_session; | |
2289 | nr_pids = kernel_list_tracker_pids(ksess, pids); | |
2290 | if (nr_pids < 0) { | |
2291 | ret = LTTNG_ERR_KERN_LIST_FAIL; | |
2292 | goto error; | |
2293 | } | |
2294 | break; | |
2295 | } | |
2296 | case LTTNG_DOMAIN_UST: | |
2297 | { | |
2298 | struct ltt_ust_session *usess; | |
2299 | ||
2300 | usess = session->ust_session; | |
2301 | nr_pids = trace_ust_list_tracker_pids(usess, pids); | |
2302 | if (nr_pids < 0) { | |
2303 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2304 | goto error; | |
2305 | } | |
2306 | break; | |
2307 | } | |
2308 | case LTTNG_DOMAIN_LOG4J: | |
2309 | case LTTNG_DOMAIN_JUL: | |
2310 | case LTTNG_DOMAIN_PYTHON: | |
2311 | default: | |
2312 | ret = LTTNG_ERR_UND; | |
2313 | goto error; | |
2314 | } | |
2315 | ||
2316 | return nr_pids; | |
2317 | ||
2318 | error: | |
2319 | /* Return negative value to differentiate return code */ | |
2320 | return -ret; | |
2321 | } | |
2322 | ||
2f77fc4b DG |
2323 | /* |
2324 | * Command LTTNG_START_TRACE processed by the client thread. | |
a9ad0c8f MD |
2325 | * |
2326 | * Called with session mutex held. | |
2f77fc4b DG |
2327 | */ |
2328 | int cmd_start_trace(struct ltt_session *session) | |
2329 | { | |
2330 | int ret; | |
cde3e505 | 2331 | unsigned long nb_chan = 0; |
2f77fc4b DG |
2332 | struct ltt_kernel_session *ksession; |
2333 | struct ltt_ust_session *usess; | |
2f77fc4b DG |
2334 | |
2335 | assert(session); | |
2336 | ||
2337 | /* Ease our life a bit ;) */ | |
2338 | ksession = session->kernel_session; | |
2339 | usess = session->ust_session; | |
2340 | ||
8382cf6f DG |
2341 | /* Is the session already started? */ |
2342 | if (session->active) { | |
f73fabfd | 2343 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2344 | goto error; |
2345 | } | |
2346 | ||
cde3e505 DG |
2347 | /* |
2348 | * Starting a session without channel is useless since after that it's not | |
2349 | * possible to enable channel thus inform the client. | |
2350 | */ | |
2351 | if (usess && usess->domain_global.channels) { | |
2352 | nb_chan += lttng_ht_get_count(usess->domain_global.channels); | |
2353 | } | |
2354 | if (ksession) { | |
2355 | nb_chan += ksession->channel_count; | |
2356 | } | |
2357 | if (!nb_chan) { | |
2358 | ret = LTTNG_ERR_NO_CHANNEL; | |
2359 | goto error; | |
2360 | } | |
2361 | ||
2f77fc4b DG |
2362 | /* Kernel tracing */ |
2363 | if (ksession != NULL) { | |
9b6c7ec5 DG |
2364 | ret = start_kernel_session(ksession, kernel_tracer_fd); |
2365 | if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2366 | goto error; |
2367 | } | |
2f77fc4b DG |
2368 | } |
2369 | ||
2370 | /* Flag session that trace should start automatically */ | |
2371 | if (usess) { | |
14fb1ebe DG |
2372 | /* |
2373 | * Even though the start trace might fail, flag this session active so | |
2374 | * other application coming in are started by default. | |
2375 | */ | |
2376 | usess->active = 1; | |
2f77fc4b DG |
2377 | |
2378 | ret = ust_app_start_trace_all(usess); | |
2379 | if (ret < 0) { | |
f73fabfd | 2380 | ret = LTTNG_ERR_UST_START_FAIL; |
2f77fc4b DG |
2381 | goto error; |
2382 | } | |
2383 | } | |
2384 | ||
8382cf6f DG |
2385 | /* Flag this after a successful start. */ |
2386 | session->has_been_started = 1; | |
2387 | session->active = 1; | |
9b6c7ec5 | 2388 | |
f73fabfd | 2389 | ret = LTTNG_OK; |
2f77fc4b DG |
2390 | |
2391 | error: | |
2392 | return ret; | |
2393 | } | |
2394 | ||
2395 | /* | |
2396 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2397 | */ | |
2398 | int cmd_stop_trace(struct ltt_session *session) | |
2399 | { | |
2400 | int ret; | |
2401 | struct ltt_kernel_channel *kchan; | |
2402 | struct ltt_kernel_session *ksession; | |
2403 | struct ltt_ust_session *usess; | |
2404 | ||
2405 | assert(session); | |
2406 | ||
2407 | /* Short cut */ | |
2408 | ksession = session->kernel_session; | |
2409 | usess = session->ust_session; | |
2410 | ||
8382cf6f DG |
2411 | /* Session is not active. Skip everythong and inform the client. */ |
2412 | if (!session->active) { | |
f73fabfd | 2413 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
2f77fc4b DG |
2414 | goto error; |
2415 | } | |
2416 | ||
2f77fc4b | 2417 | /* Kernel tracer */ |
14fb1ebe | 2418 | if (ksession && ksession->active) { |
2f77fc4b DG |
2419 | DBG("Stop kernel tracing"); |
2420 | ||
2421 | /* Flush metadata if exist */ | |
2422 | if (ksession->metadata_stream_fd >= 0) { | |
2423 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2424 | if (ret < 0) { | |
2425 | ERR("Kernel metadata flush failed"); | |
2426 | } | |
2427 | } | |
2428 | ||
2429 | /* Flush all buffers before stopping */ | |
2430 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2431 | ret = kernel_flush_buffer(kchan); | |
2432 | if (ret < 0) { | |
2433 | ERR("Kernel flush buffer error"); | |
2434 | } | |
2435 | } | |
2436 | ||
2437 | ret = kernel_stop_session(ksession); | |
2438 | if (ret < 0) { | |
f73fabfd | 2439 | ret = LTTNG_ERR_KERN_STOP_FAIL; |
2f77fc4b DG |
2440 | goto error; |
2441 | } | |
2442 | ||
2443 | kernel_wait_quiescent(kernel_tracer_fd); | |
9b6c7ec5 | 2444 | |
14fb1ebe | 2445 | ksession->active = 0; |
2f77fc4b DG |
2446 | } |
2447 | ||
14fb1ebe DG |
2448 | if (usess && usess->active) { |
2449 | /* | |
2450 | * Even though the stop trace might fail, flag this session inactive so | |
2451 | * other application coming in are not started by default. | |
2452 | */ | |
2453 | usess->active = 0; | |
2f77fc4b DG |
2454 | |
2455 | ret = ust_app_stop_trace_all(usess); | |
2456 | if (ret < 0) { | |
f73fabfd | 2457 | ret = LTTNG_ERR_UST_STOP_FAIL; |
2f77fc4b DG |
2458 | goto error; |
2459 | } | |
2460 | } | |
2461 | ||
8382cf6f DG |
2462 | /* Flag inactive after a successful stop. */ |
2463 | session->active = 0; | |
f73fabfd | 2464 | ret = LTTNG_OK; |
2f77fc4b DG |
2465 | |
2466 | error: | |
2467 | return ret; | |
2468 | } | |
2469 | ||
2470 | /* | |
2471 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
2472 | */ | |
bda32d56 JG |
2473 | int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri, |
2474 | struct lttng_uri *uris) | |
2f77fc4b DG |
2475 | { |
2476 | int ret, i; | |
2477 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2478 | struct ltt_ust_session *usess = session->ust_session; | |
2f77fc4b DG |
2479 | |
2480 | assert(session); | |
2481 | assert(uris); | |
2482 | assert(nb_uri > 0); | |
2483 | ||
8382cf6f DG |
2484 | /* Can't set consumer URI if the session is active. */ |
2485 | if (session->active) { | |
f73fabfd | 2486 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2487 | goto error; |
2488 | } | |
2489 | ||
bda32d56 | 2490 | /* Set the "global" consumer URIs */ |
2f77fc4b | 2491 | for (i = 0; i < nb_uri; i++) { |
bda32d56 JG |
2492 | ret = add_uri_to_consumer(session->consumer, |
2493 | &uris[i], 0, session->name); | |
a74934ba | 2494 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2495 | goto error; |
2496 | } | |
2f77fc4b DG |
2497 | } |
2498 | ||
bda32d56 JG |
2499 | /* Set UST session URIs */ |
2500 | if (session->ust_session) { | |
2501 | for (i = 0; i < nb_uri; i++) { | |
2502 | ret = add_uri_to_consumer( | |
2503 | session->ust_session->consumer, | |
2504 | &uris[i], LTTNG_DOMAIN_UST, | |
2505 | session->name); | |
2506 | if (ret != LTTNG_OK) { | |
2507 | goto error; | |
2508 | } | |
2509 | } | |
2510 | } | |
2511 | ||
2512 | /* Set kernel session URIs */ | |
2513 | if (session->kernel_session) { | |
2514 | for (i = 0; i < nb_uri; i++) { | |
2515 | ret = add_uri_to_consumer( | |
2516 | session->kernel_session->consumer, | |
2517 | &uris[i], LTTNG_DOMAIN_KERNEL, | |
2518 | session->name); | |
2519 | if (ret != LTTNG_OK) { | |
2520 | goto error; | |
2521 | } | |
2522 | } | |
2523 | } | |
2524 | ||
7ab70fe0 DG |
2525 | /* |
2526 | * Make sure to set the session in output mode after we set URI since a | |
2527 | * session can be created without URL (thus flagged in no output mode). | |
2528 | */ | |
2529 | session->output_traces = 1; | |
2530 | if (ksess) { | |
2531 | ksess->output_traces = 1; | |
bda32d56 JG |
2532 | } |
2533 | ||
2534 | if (usess) { | |
7ab70fe0 DG |
2535 | usess->output_traces = 1; |
2536 | } | |
2537 | ||
2f77fc4b | 2538 | /* All good! */ |
f73fabfd | 2539 | ret = LTTNG_OK; |
2f77fc4b DG |
2540 | |
2541 | error: | |
2542 | return ret; | |
2543 | } | |
2544 | ||
2545 | /* | |
2546 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2547 | */ | |
2548 | int cmd_create_session_uri(char *name, struct lttng_uri *uris, | |
ecc48a90 | 2549 | size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer) |
2f77fc4b DG |
2550 | { |
2551 | int ret; | |
2f77fc4b DG |
2552 | struct ltt_session *session; |
2553 | ||
2554 | assert(name); | |
2bba9e53 | 2555 | assert(creds); |
785d2d0d | 2556 | |
2f77fc4b DG |
2557 | /* |
2558 | * Verify if the session already exist | |
2559 | * | |
2560 | * XXX: There is no need for the session lock list here since the caller | |
2561 | * (process_client_msg) is holding it. We might want to change that so a | |
2562 | * single command does not lock the entire session list. | |
2563 | */ | |
2564 | session = session_find_by_name(name); | |
2565 | if (session != NULL) { | |
f73fabfd | 2566 | ret = LTTNG_ERR_EXIST_SESS; |
2f77fc4b DG |
2567 | goto find_error; |
2568 | } | |
2569 | ||
2570 | /* Create tracing session in the registry */ | |
dec56f6c | 2571 | ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds), |
2f77fc4b | 2572 | LTTNG_SOCK_GET_GID_CRED(creds)); |
f73fabfd | 2573 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2574 | goto session_error; |
2575 | } | |
2576 | ||
2577 | /* | |
2578 | * Get the newly created session pointer back | |
2579 | * | |
2580 | * XXX: There is no need for the session lock list here since the caller | |
2581 | * (process_client_msg) is holding it. We might want to change that so a | |
2582 | * single command does not lock the entire session list. | |
2583 | */ | |
2584 | session = session_find_by_name(name); | |
2585 | assert(session); | |
2586 | ||
ecc48a90 | 2587 | session->live_timer = live_timer; |
2f77fc4b DG |
2588 | /* Create default consumer output for the session not yet created. */ |
2589 | session->consumer = consumer_create_output(CONSUMER_DST_LOCAL); | |
2590 | if (session->consumer == NULL) { | |
f73fabfd | 2591 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2592 | goto consumer_error; |
2593 | } | |
2594 | ||
2bba9e53 | 2595 | if (uris) { |
bda32d56 | 2596 | ret = cmd_set_consumer_uri(session, nb_uri, uris); |
2bba9e53 DG |
2597 | if (ret != LTTNG_OK) { |
2598 | goto consumer_error; | |
2599 | } | |
2600 | session->output_traces = 1; | |
2601 | } else { | |
2602 | session->output_traces = 0; | |
2603 | DBG2("Session %s created with no output", session->name); | |
2f77fc4b DG |
2604 | } |
2605 | ||
2606 | session->consumer->enabled = 1; | |
2607 | ||
f73fabfd | 2608 | return LTTNG_OK; |
2f77fc4b DG |
2609 | |
2610 | consumer_error: | |
2611 | session_destroy(session); | |
2612 | session_error: | |
2613 | find_error: | |
2614 | return ret; | |
2615 | } | |
2616 | ||
27babd3a DG |
2617 | /* |
2618 | * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread. | |
2619 | */ | |
2620 | int cmd_create_session_snapshot(char *name, struct lttng_uri *uris, | |
2621 | size_t nb_uri, lttng_sock_cred *creds) | |
2622 | { | |
2623 | int ret; | |
2624 | struct ltt_session *session; | |
2625 | struct snapshot_output *new_output = NULL; | |
2626 | ||
2627 | assert(name); | |
2628 | assert(creds); | |
2629 | ||
2630 | /* | |
2631 | * Create session in no output mode with URIs set to NULL. The uris we've | |
2632 | * received are for a default snapshot output if one. | |
2633 | */ | |
ae58b817 | 2634 | ret = cmd_create_session_uri(name, NULL, 0, creds, 0); |
27babd3a DG |
2635 | if (ret != LTTNG_OK) { |
2636 | goto error; | |
2637 | } | |
2638 | ||
2639 | /* Get the newly created session pointer back. This should NEVER fail. */ | |
2640 | session = session_find_by_name(name); | |
2641 | assert(session); | |
2642 | ||
2643 | /* Flag session for snapshot mode. */ | |
2644 | session->snapshot_mode = 1; | |
2645 | ||
2646 | /* Skip snapshot output creation if no URI is given. */ | |
2647 | if (nb_uri == 0) { | |
2648 | goto end; | |
2649 | } | |
2650 | ||
2651 | new_output = snapshot_output_alloc(); | |
2652 | if (!new_output) { | |
2653 | ret = LTTNG_ERR_NOMEM; | |
2654 | goto error_snapshot_alloc; | |
2655 | } | |
2656 | ||
2657 | ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL, | |
2658 | uris, nb_uri, session->consumer, new_output, &session->snapshot); | |
2659 | if (ret < 0) { | |
2660 | if (ret == -ENOMEM) { | |
2661 | ret = LTTNG_ERR_NOMEM; | |
2662 | } else { | |
2663 | ret = LTTNG_ERR_INVALID; | |
2664 | } | |
2665 | goto error_snapshot; | |
2666 | } | |
2667 | ||
2668 | rcu_read_lock(); | |
2669 | snapshot_add_output(&session->snapshot, new_output); | |
2670 | rcu_read_unlock(); | |
2671 | ||
2672 | end: | |
2673 | return LTTNG_OK; | |
2674 | ||
2675 | error_snapshot: | |
2676 | snapshot_output_destroy(new_output); | |
2677 | error_snapshot_alloc: | |
2678 | session_destroy(session); | |
2679 | error: | |
2680 | return ret; | |
2681 | } | |
2682 | ||
2f77fc4b DG |
2683 | /* |
2684 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
a9ad0c8f MD |
2685 | * |
2686 | * Called with session lock held. | |
2f77fc4b DG |
2687 | */ |
2688 | int cmd_destroy_session(struct ltt_session *session, int wpipe) | |
2689 | { | |
2690 | int ret; | |
2691 | struct ltt_ust_session *usess; | |
2692 | struct ltt_kernel_session *ksess; | |
2693 | ||
2694 | /* Safety net */ | |
2695 | assert(session); | |
2696 | ||
2697 | usess = session->ust_session; | |
2698 | ksess = session->kernel_session; | |
2699 | ||
2700 | /* Clean kernel session teardown */ | |
2701 | kernel_destroy_session(ksess); | |
2702 | ||
2703 | /* UST session teardown */ | |
2704 | if (usess) { | |
2705 | /* Close any relayd session */ | |
2706 | consumer_output_send_destroy_relayd(usess->consumer); | |
2707 | ||
2708 | /* Destroy every UST application related to this session. */ | |
2709 | ret = ust_app_destroy_trace_all(usess); | |
2710 | if (ret) { | |
2711 | ERR("Error in ust_app_destroy_trace_all"); | |
2712 | } | |
2713 | ||
2714 | /* Clean up the rest. */ | |
2715 | trace_ust_destroy_session(usess); | |
2716 | } | |
2717 | ||
2718 | /* | |
2719 | * Must notify the kernel thread here to update it's poll set in order to | |
2720 | * remove the channel(s)' fd just destroyed. | |
2721 | */ | |
2722 | ret = notify_thread_pipe(wpipe); | |
2723 | if (ret < 0) { | |
2724 | PERROR("write kernel poll pipe"); | |
2725 | } | |
2726 | ||
2727 | ret = session_destroy(session); | |
2728 | ||
2729 | return ret; | |
2730 | } | |
2731 | ||
2732 | /* | |
2733 | * Command LTTNG_CALIBRATE processed by the client thread. | |
2734 | */ | |
56a37563 JG |
2735 | int cmd_calibrate(enum lttng_domain_type domain, |
2736 | struct lttng_calibrate *calibrate) | |
2f77fc4b DG |
2737 | { |
2738 | int ret; | |
2739 | ||
2740 | switch (domain) { | |
2741 | case LTTNG_DOMAIN_KERNEL: | |
2742 | { | |
2743 | struct lttng_kernel_calibrate kcalibrate; | |
2744 | ||
2e84128e DG |
2745 | switch (calibrate->type) { |
2746 | case LTTNG_CALIBRATE_FUNCTION: | |
2747 | default: | |
2748 | /* Default and only possible calibrate option. */ | |
2749 | kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE; | |
2750 | break; | |
2751 | } | |
2752 | ||
2f77fc4b DG |
2753 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); |
2754 | if (ret < 0) { | |
f73fabfd | 2755 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
2f77fc4b DG |
2756 | goto error; |
2757 | } | |
2758 | break; | |
2759 | } | |
2760 | case LTTNG_DOMAIN_UST: | |
2761 | { | |
2762 | struct lttng_ust_calibrate ucalibrate; | |
2763 | ||
2e84128e DG |
2764 | switch (calibrate->type) { |
2765 | case LTTNG_CALIBRATE_FUNCTION: | |
2766 | default: | |
2767 | /* Default and only possible calibrate option. */ | |
2768 | ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT; | |
2769 | break; | |
2770 | } | |
2771 | ||
2f77fc4b DG |
2772 | ret = ust_app_calibrate_glb(&ucalibrate); |
2773 | if (ret < 0) { | |
f73fabfd | 2774 | ret = LTTNG_ERR_UST_CALIBRATE_FAIL; |
2f77fc4b DG |
2775 | goto error; |
2776 | } | |
2777 | break; | |
2778 | } | |
2779 | default: | |
f73fabfd | 2780 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2781 | goto error; |
2782 | } | |
2783 | ||
f73fabfd | 2784 | ret = LTTNG_OK; |
2f77fc4b DG |
2785 | |
2786 | error: | |
2787 | return ret; | |
2788 | } | |
2789 | ||
2790 | /* | |
2791 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
2792 | */ | |
56a37563 JG |
2793 | int cmd_register_consumer(struct ltt_session *session, |
2794 | enum lttng_domain_type domain, const char *sock_path, | |
2795 | struct consumer_data *cdata) | |
2f77fc4b DG |
2796 | { |
2797 | int ret, sock; | |
dd81b457 | 2798 | struct consumer_socket *socket = NULL; |
2f77fc4b DG |
2799 | |
2800 | assert(session); | |
2801 | assert(cdata); | |
2802 | assert(sock_path); | |
2803 | ||
2804 | switch (domain) { | |
2805 | case LTTNG_DOMAIN_KERNEL: | |
2806 | { | |
2807 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2808 | ||
2809 | assert(ksess); | |
2810 | ||
2811 | /* Can't register a consumer if there is already one */ | |
2812 | if (ksess->consumer_fds_sent != 0) { | |
f73fabfd | 2813 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
2814 | goto error; |
2815 | } | |
2816 | ||
2817 | sock = lttcomm_connect_unix_sock(sock_path); | |
2818 | if (sock < 0) { | |
f73fabfd | 2819 | ret = LTTNG_ERR_CONNECT_FAIL; |
2f77fc4b DG |
2820 | goto error; |
2821 | } | |
4ce514c4 | 2822 | cdata->cmd_sock = sock; |
2f77fc4b | 2823 | |
4ce514c4 | 2824 | socket = consumer_allocate_socket(&cdata->cmd_sock); |
2f77fc4b | 2825 | if (socket == NULL) { |
f66c074c DG |
2826 | ret = close(sock); |
2827 | if (ret < 0) { | |
2828 | PERROR("close register consumer"); | |
2829 | } | |
4ce514c4 | 2830 | cdata->cmd_sock = -1; |
f73fabfd | 2831 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2832 | goto error; |
2833 | } | |
2834 | ||
2835 | socket->lock = zmalloc(sizeof(pthread_mutex_t)); | |
2836 | if (socket->lock == NULL) { | |
2837 | PERROR("zmalloc pthread mutex"); | |
f73fabfd | 2838 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2839 | goto error; |
2840 | } | |
2841 | pthread_mutex_init(socket->lock, NULL); | |
2842 | socket->registered = 1; | |
2843 | ||
2844 | rcu_read_lock(); | |
2845 | consumer_add_socket(socket, ksess->consumer); | |
2846 | rcu_read_unlock(); | |
2847 | ||
2848 | pthread_mutex_lock(&cdata->pid_mutex); | |
2849 | cdata->pid = -1; | |
2850 | pthread_mutex_unlock(&cdata->pid_mutex); | |
2851 | ||
2852 | break; | |
2853 | } | |
2854 | default: | |
2855 | /* TODO: Userspace tracing */ | |
f73fabfd | 2856 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2857 | goto error; |
2858 | } | |
2859 | ||
dd81b457 | 2860 | return LTTNG_OK; |
2f77fc4b DG |
2861 | |
2862 | error: | |
dd81b457 DG |
2863 | if (socket) { |
2864 | consumer_destroy_socket(socket); | |
2865 | } | |
2f77fc4b DG |
2866 | return ret; |
2867 | } | |
2868 | ||
2869 | /* | |
2870 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
2871 | */ | |
2872 | ssize_t cmd_list_domains(struct ltt_session *session, | |
2873 | struct lttng_domain **domains) | |
2874 | { | |
2875 | int ret, index = 0; | |
2876 | ssize_t nb_dom = 0; | |
fefd409b DG |
2877 | struct agent *agt; |
2878 | struct lttng_ht_iter iter; | |
2f77fc4b DG |
2879 | |
2880 | if (session->kernel_session != NULL) { | |
2881 | DBG3("Listing domains found kernel domain"); | |
2882 | nb_dom++; | |
2883 | } | |
2884 | ||
2885 | if (session->ust_session != NULL) { | |
2886 | DBG3("Listing domains found UST global domain"); | |
2887 | nb_dom++; | |
3c6a091f | 2888 | |
e0a74f01 | 2889 | rcu_read_lock(); |
fefd409b DG |
2890 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2891 | agt, node.node) { | |
2892 | if (agt->being_used) { | |
2893 | nb_dom++; | |
2894 | } | |
3c6a091f | 2895 | } |
e0a74f01 | 2896 | rcu_read_unlock(); |
2f77fc4b DG |
2897 | } |
2898 | ||
fa64dfb4 JG |
2899 | if (!nb_dom) { |
2900 | goto end; | |
2901 | } | |
2902 | ||
2f77fc4b DG |
2903 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
2904 | if (*domains == NULL) { | |
f73fabfd | 2905 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2906 | goto error; |
2907 | } | |
2908 | ||
2909 | if (session->kernel_session != NULL) { | |
2910 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
b5edb9e8 PP |
2911 | |
2912 | /* Kernel session buffer type is always GLOBAL */ | |
2913 | (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL; | |
2914 | ||
2f77fc4b DG |
2915 | index++; |
2916 | } | |
2917 | ||
2918 | if (session->ust_session != NULL) { | |
2919 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
88c5f0d8 | 2920 | (*domains)[index].buf_type = session->ust_session->buffer_type; |
2f77fc4b | 2921 | index++; |
3c6a091f | 2922 | |
e0a74f01 | 2923 | rcu_read_lock(); |
fefd409b DG |
2924 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2925 | agt, node.node) { | |
2926 | if (agt->being_used) { | |
2927 | (*domains)[index].type = agt->domain; | |
2928 | (*domains)[index].buf_type = session->ust_session->buffer_type; | |
2929 | index++; | |
2930 | } | |
3c6a091f | 2931 | } |
e0a74f01 | 2932 | rcu_read_unlock(); |
2f77fc4b | 2933 | } |
fa64dfb4 | 2934 | end: |
2f77fc4b DG |
2935 | return nb_dom; |
2936 | ||
2937 | error: | |
f73fabfd DG |
2938 | /* Return negative value to differentiate return code */ |
2939 | return -ret; | |
2f77fc4b DG |
2940 | } |
2941 | ||
2942 | ||
2943 | /* | |
2944 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
2945 | */ | |
56a37563 JG |
2946 | ssize_t cmd_list_channels(enum lttng_domain_type domain, |
2947 | struct ltt_session *session, struct lttng_channel **channels) | |
2f77fc4b | 2948 | { |
53e367f9 | 2949 | ssize_t nb_chan = 0, payload_size = 0, ret; |
2f77fc4b DG |
2950 | |
2951 | switch (domain) { | |
2952 | case LTTNG_DOMAIN_KERNEL: | |
2953 | if (session->kernel_session != NULL) { | |
2954 | nb_chan = session->kernel_session->channel_count; | |
2955 | } | |
2956 | DBG3("Number of kernel channels %zd", nb_chan); | |
c7d620a2 | 2957 | if (nb_chan <= 0) { |
53e367f9 JG |
2958 | ret = -LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2959 | goto end; | |
c7d620a2 | 2960 | } |
2f77fc4b DG |
2961 | break; |
2962 | case LTTNG_DOMAIN_UST: | |
2963 | if (session->ust_session != NULL) { | |
7ffc31a2 | 2964 | rcu_read_lock(); |
2f77fc4b | 2965 | nb_chan = lttng_ht_get_count( |
7ffc31a2 JG |
2966 | session->ust_session->domain_global.channels); |
2967 | rcu_read_unlock(); | |
2f77fc4b DG |
2968 | } |
2969 | DBG3("Number of UST global channels %zd", nb_chan); | |
ade7ce52 | 2970 | if (nb_chan < 0) { |
53e367f9 JG |
2971 | ret = -LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2972 | goto end; | |
c7d620a2 | 2973 | } |
2f77fc4b DG |
2974 | break; |
2975 | default: | |
53e367f9 JG |
2976 | ret = -LTTNG_ERR_UND; |
2977 | goto end; | |
2f77fc4b DG |
2978 | } |
2979 | ||
2980 | if (nb_chan > 0) { | |
53e367f9 JG |
2981 | const size_t channel_size = sizeof(struct lttng_channel) + |
2982 | sizeof(struct lttcomm_channel_extended); | |
2983 | struct lttcomm_channel_extended *channel_exts; | |
2984 | ||
2985 | payload_size = nb_chan * channel_size; | |
2986 | *channels = zmalloc(payload_size); | |
2f77fc4b | 2987 | if (*channels == NULL) { |
53e367f9 JG |
2988 | ret = -LTTNG_ERR_FATAL; |
2989 | goto end; | |
2f77fc4b DG |
2990 | } |
2991 | ||
53e367f9 JG |
2992 | channel_exts = ((void *) *channels) + |
2993 | (nb_chan * sizeof(struct lttng_channel)); | |
2994 | list_lttng_channels(domain, session, *channels, channel_exts); | |
2995 | } else { | |
2996 | *channels = NULL; | |
2f77fc4b DG |
2997 | } |
2998 | ||
53e367f9 JG |
2999 | ret = payload_size; |
3000 | end: | |
3001 | return ret; | |
2f77fc4b DG |
3002 | } |
3003 | ||
3004 | /* | |
3005 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3006 | */ | |
56a37563 JG |
3007 | ssize_t cmd_list_events(enum lttng_domain_type domain, |
3008 | struct ltt_session *session, char *channel_name, | |
b4e3ceb9 | 3009 | struct lttng_event **events, size_t *total_size) |
2f77fc4b DG |
3010 | { |
3011 | int ret = 0; | |
3012 | ssize_t nb_event = 0; | |
3013 | ||
3014 | switch (domain) { | |
3015 | case LTTNG_DOMAIN_KERNEL: | |
3016 | if (session->kernel_session != NULL) { | |
3017 | nb_event = list_lttng_kernel_events(channel_name, | |
b4e3ceb9 PP |
3018 | session->kernel_session, events, |
3019 | total_size); | |
2f77fc4b DG |
3020 | } |
3021 | break; | |
3022 | case LTTNG_DOMAIN_UST: | |
3023 | { | |
3024 | if (session->ust_session != NULL) { | |
3025 | nb_event = list_lttng_ust_global_events(channel_name, | |
b4e3ceb9 PP |
3026 | &session->ust_session->domain_global, events, |
3027 | total_size); | |
2f77fc4b DG |
3028 | } |
3029 | break; | |
3030 | } | |
5cdb6027 | 3031 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 3032 | case LTTNG_DOMAIN_JUL: |
0e115563 | 3033 | case LTTNG_DOMAIN_PYTHON: |
3c6a091f | 3034 | if (session->ust_session) { |
fefd409b DG |
3035 | struct lttng_ht_iter iter; |
3036 | struct agent *agt; | |
3037 | ||
b11feea5 | 3038 | rcu_read_lock(); |
fefd409b DG |
3039 | cds_lfht_for_each_entry(session->ust_session->agents->ht, |
3040 | &iter.iter, agt, node.node) { | |
1dfd9906 JG |
3041 | if (agt->domain == domain) { |
3042 | nb_event = list_lttng_agent_events( | |
b4e3ceb9 PP |
3043 | agt, events, |
3044 | total_size); | |
1dfd9906 JG |
3045 | break; |
3046 | } | |
fefd409b | 3047 | } |
b11feea5 | 3048 | rcu_read_unlock(); |
3c6a091f DG |
3049 | } |
3050 | break; | |
2f77fc4b | 3051 | default: |
f73fabfd | 3052 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3053 | goto error; |
3054 | } | |
3055 | ||
f73fabfd | 3056 | return nb_event; |
2f77fc4b DG |
3057 | |
3058 | error: | |
f73fabfd DG |
3059 | /* Return negative value to differentiate return code */ |
3060 | return -ret; | |
2f77fc4b DG |
3061 | } |
3062 | ||
3063 | /* | |
3064 | * Using the session list, filled a lttng_session array to send back to the | |
3065 | * client for session listing. | |
3066 | * | |
3067 | * The session list lock MUST be acquired before calling this function. Use | |
3068 | * session_lock_list() and session_unlock_list(). | |
3069 | */ | |
3070 | void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid, | |
3071 | gid_t gid) | |
3072 | { | |
3073 | int ret; | |
3074 | unsigned int i = 0; | |
3075 | struct ltt_session *session; | |
3076 | struct ltt_session_list *list = session_get_list(); | |
3077 | ||
3078 | DBG("Getting all available session for UID %d GID %d", | |
3079 | uid, gid); | |
3080 | /* | |
3081 | * Iterate over session list and append data after the control struct in | |
3082 | * the buffer. | |
3083 | */ | |
3084 | cds_list_for_each_entry(session, &list->head, list) { | |
3085 | /* | |
3086 | * Only list the sessions the user can control. | |
3087 | */ | |
3088 | if (!session_access_ok(session, uid, gid)) { | |
3089 | continue; | |
3090 | } | |
3091 | ||
3092 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3093 | struct ltt_ust_session *usess = session->ust_session; | |
3094 | ||
3095 | if (session->consumer->type == CONSUMER_DST_NET || | |
3096 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
3097 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
3098 | ret = build_network_session_path(sessions[i].path, | |
dec56f6c | 3099 | sizeof(sessions[i].path), session); |
2f77fc4b | 3100 | } else { |
dec56f6c | 3101 | ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s", |
2f77fc4b DG |
3102 | session->consumer->dst.trace_path); |
3103 | } | |
3104 | if (ret < 0) { | |
3105 | PERROR("snprintf session path"); | |
3106 | continue; | |
3107 | } | |
3108 | ||
3109 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
3110 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
8382cf6f | 3111 | sessions[i].enabled = session->active; |
2cbf8fed | 3112 | sessions[i].snapshot_mode = session->snapshot_mode; |
8960e9cd | 3113 | sessions[i].live_timer_interval = session->live_timer; |
2f77fc4b DG |
3114 | i++; |
3115 | } | |
3116 | } | |
3117 | ||
806e2684 | 3118 | /* |
6d805429 | 3119 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
d3f14b8a | 3120 | * ready for trace analysis (or any kind of reader) or else 1 for pending data. |
806e2684 | 3121 | */ |
6d805429 | 3122 | int cmd_data_pending(struct ltt_session *session) |
806e2684 DG |
3123 | { |
3124 | int ret; | |
3125 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3126 | struct ltt_ust_session *usess = session->ust_session; | |
3127 | ||
3128 | assert(session); | |
3129 | ||
3130 | /* Session MUST be stopped to ask for data availability. */ | |
8382cf6f | 3131 | if (session->active) { |
806e2684 DG |
3132 | ret = LTTNG_ERR_SESSION_STARTED; |
3133 | goto error; | |
3a89d11a DG |
3134 | } else { |
3135 | /* | |
3136 | * If stopped, just make sure we've started before else the above call | |
3137 | * will always send that there is data pending. | |
3138 | * | |
3139 | * The consumer assumes that when the data pending command is received, | |
3140 | * the trace has been started before or else no output data is written | |
3141 | * by the streams which is a condition for data pending. So, this is | |
3142 | * *VERY* important that we don't ask the consumer before a start | |
3143 | * trace. | |
3144 | */ | |
8382cf6f | 3145 | if (!session->has_been_started) { |
3a89d11a DG |
3146 | ret = 0; |
3147 | goto error; | |
3148 | } | |
806e2684 DG |
3149 | } |
3150 | ||
3151 | if (ksess && ksess->consumer) { | |
6d805429 DG |
3152 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
3153 | if (ret == 1) { | |
806e2684 DG |
3154 | /* Data is still being extracted for the kernel. */ |
3155 | goto error; | |
3156 | } | |
3157 | } | |
3158 | ||
3159 | if (usess && usess->consumer) { | |
6d805429 DG |
3160 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
3161 | if (ret == 1) { | |
806e2684 DG |
3162 | /* Data is still being extracted for the kernel. */ |
3163 | goto error; | |
3164 | } | |
3165 | } | |
3166 | ||
3167 | /* Data is ready to be read by a viewer */ | |
6d805429 | 3168 | ret = 0; |
806e2684 DG |
3169 | |
3170 | error: | |
3171 | return ret; | |
3172 | } | |
3173 | ||
6dc3064a DG |
3174 | /* |
3175 | * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library. | |
3176 | * | |
3177 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3178 | */ | |
3179 | int cmd_snapshot_add_output(struct ltt_session *session, | |
3180 | struct lttng_snapshot_output *output, uint32_t *id) | |
3181 | { | |
3182 | int ret; | |
3183 | struct snapshot_output *new_output; | |
3184 | ||
3185 | assert(session); | |
3186 | assert(output); | |
3187 | ||
3188 | DBG("Cmd snapshot add output for session %s", session->name); | |
3189 | ||
3190 | /* | |
d3f14b8a MD |
3191 | * Permission denied to create an output if the session is not |
3192 | * set in no output mode. | |
6dc3064a DG |
3193 | */ |
3194 | if (session->output_traces) { | |
3195 | ret = LTTNG_ERR_EPERM; | |
3196 | goto error; | |
3197 | } | |
3198 | ||
3199 | /* Only one output is allowed until we have the "tee" feature. */ | |
3200 | if (session->snapshot.nb_output == 1) { | |
3201 | ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST; | |
3202 | goto error; | |
3203 | } | |
3204 | ||
3205 | new_output = snapshot_output_alloc(); | |
3206 | if (!new_output) { | |
3207 | ret = LTTNG_ERR_NOMEM; | |
3208 | goto error; | |
3209 | } | |
3210 | ||
3211 | ret = snapshot_output_init(output->max_size, output->name, | |
3212 | output->ctrl_url, output->data_url, session->consumer, new_output, | |
3213 | &session->snapshot); | |
3214 | if (ret < 0) { | |
3215 | if (ret == -ENOMEM) { | |
3216 | ret = LTTNG_ERR_NOMEM; | |
3217 | } else { | |
3218 | ret = LTTNG_ERR_INVALID; | |
3219 | } | |
3220 | goto free_error; | |
3221 | } | |
3222 | ||
6dc3064a DG |
3223 | rcu_read_lock(); |
3224 | snapshot_add_output(&session->snapshot, new_output); | |
3225 | if (id) { | |
3226 | *id = new_output->id; | |
3227 | } | |
3228 | rcu_read_unlock(); | |
3229 | ||
3230 | return LTTNG_OK; | |
3231 | ||
3232 | free_error: | |
3233 | snapshot_output_destroy(new_output); | |
3234 | error: | |
3235 | return ret; | |
3236 | } | |
3237 | ||
3238 | /* | |
3239 | * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl. | |
3240 | * | |
3241 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3242 | */ | |
3243 | int cmd_snapshot_del_output(struct ltt_session *session, | |
3244 | struct lttng_snapshot_output *output) | |
3245 | { | |
3246 | int ret; | |
eb240553 | 3247 | struct snapshot_output *sout = NULL; |
6dc3064a DG |
3248 | |
3249 | assert(session); | |
3250 | assert(output); | |
3251 | ||
6dc3064a DG |
3252 | rcu_read_lock(); |
3253 | ||
3254 | /* | |
d3f14b8a MD |
3255 | * Permission denied to create an output if the session is not |
3256 | * set in no output mode. | |
6dc3064a DG |
3257 | */ |
3258 | if (session->output_traces) { | |
3259 | ret = LTTNG_ERR_EPERM; | |
3260 | goto error; | |
3261 | } | |
3262 | ||
eb240553 DG |
3263 | if (output->id) { |
3264 | DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id, | |
3265 | session->name); | |
3266 | sout = snapshot_find_output_by_id(output->id, &session->snapshot); | |
3267 | } else if (*output->name != '\0') { | |
3268 | DBG("Cmd snapshot del output name %s for session %s", output->name, | |
3269 | session->name); | |
3270 | sout = snapshot_find_output_by_name(output->name, &session->snapshot); | |
3271 | } | |
6dc3064a DG |
3272 | if (!sout) { |
3273 | ret = LTTNG_ERR_INVALID; | |
3274 | goto error; | |
3275 | } | |
3276 | ||
3277 | snapshot_delete_output(&session->snapshot, sout); | |
3278 | snapshot_output_destroy(sout); | |
3279 | ret = LTTNG_OK; | |
3280 | ||
3281 | error: | |
3282 | rcu_read_unlock(); | |
3283 | return ret; | |
3284 | } | |
3285 | ||
3286 | /* | |
3287 | * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl. | |
3288 | * | |
3289 | * If no output is available, outputs is untouched and 0 is returned. | |
3290 | * | |
3291 | * Return the size of the newly allocated outputs or a negative LTTNG_ERR code. | |
3292 | */ | |
3293 | ssize_t cmd_snapshot_list_outputs(struct ltt_session *session, | |
3294 | struct lttng_snapshot_output **outputs) | |
3295 | { | |
3296 | int ret, idx = 0; | |
b223ca94 | 3297 | struct lttng_snapshot_output *list = NULL; |
6dc3064a DG |
3298 | struct lttng_ht_iter iter; |
3299 | struct snapshot_output *output; | |
3300 | ||
3301 | assert(session); | |
3302 | assert(outputs); | |
3303 | ||
3304 | DBG("Cmd snapshot list outputs for session %s", session->name); | |
3305 | ||
3306 | /* | |
d3f14b8a MD |
3307 | * Permission denied to create an output if the session is not |
3308 | * set in no output mode. | |
6dc3064a DG |
3309 | */ |
3310 | if (session->output_traces) { | |
b223ca94 | 3311 | ret = -LTTNG_ERR_EPERM; |
6dc3064a DG |
3312 | goto error; |
3313 | } | |
3314 | ||
3315 | if (session->snapshot.nb_output == 0) { | |
3316 | ret = 0; | |
3317 | goto error; | |
3318 | } | |
3319 | ||
3320 | list = zmalloc(session->snapshot.nb_output * sizeof(*list)); | |
3321 | if (!list) { | |
b223ca94 | 3322 | ret = -LTTNG_ERR_NOMEM; |
6dc3064a DG |
3323 | goto error; |
3324 | } | |
3325 | ||
3326 | /* Copy list from session to the new list object. */ | |
b223ca94 | 3327 | rcu_read_lock(); |
6dc3064a DG |
3328 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter, |
3329 | output, node.node) { | |
3330 | assert(output->consumer); | |
3331 | list[idx].id = output->id; | |
3332 | list[idx].max_size = output->max_size; | |
3333 | strncpy(list[idx].name, output->name, sizeof(list[idx].name)); | |
3334 | if (output->consumer->type == CONSUMER_DST_LOCAL) { | |
3335 | strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path, | |
3336 | sizeof(list[idx].ctrl_url)); | |
3337 | } else { | |
3338 | /* Control URI. */ | |
3339 | ret = uri_to_str_url(&output->consumer->dst.net.control, | |
3340 | list[idx].ctrl_url, sizeof(list[idx].ctrl_url)); | |
3341 | if (ret < 0) { | |
b223ca94 JG |
3342 | ret = -LTTNG_ERR_NOMEM; |
3343 | goto error; | |
6dc3064a DG |
3344 | } |
3345 | ||
3346 | /* Data URI. */ | |
3347 | ret = uri_to_str_url(&output->consumer->dst.net.data, | |
3348 | list[idx].data_url, sizeof(list[idx].data_url)); | |
3349 | if (ret < 0) { | |
b223ca94 JG |
3350 | ret = -LTTNG_ERR_NOMEM; |
3351 | goto error; | |
6dc3064a DG |
3352 | } |
3353 | } | |
3354 | idx++; | |
3355 | } | |
3356 | ||
3357 | *outputs = list; | |
b223ca94 JG |
3358 | list = NULL; |
3359 | ret = session->snapshot.nb_output; | |
6dc3064a | 3360 | error: |
b223ca94 JG |
3361 | free(list); |
3362 | rcu_read_unlock(); | |
3363 | return ret; | |
6dc3064a DG |
3364 | } |
3365 | ||
3366 | /* | |
3367 | * Send relayd sockets from snapshot output to consumer. Ignore request if the | |
3368 | * snapshot output is *not* set with a remote destination. | |
3369 | * | |
a934f4af | 3370 | * Return 0 on success or a LTTNG_ERR code. |
6dc3064a DG |
3371 | */ |
3372 | static int set_relayd_for_snapshot(struct consumer_output *consumer, | |
3373 | struct snapshot_output *snap_output, struct ltt_session *session) | |
3374 | { | |
a934f4af | 3375 | int ret = LTTNG_OK; |
6dc3064a DG |
3376 | struct lttng_ht_iter iter; |
3377 | struct consumer_socket *socket; | |
3378 | ||
3379 | assert(consumer); | |
3380 | assert(snap_output); | |
3381 | assert(session); | |
3382 | ||
3383 | DBG2("Set relayd object from snapshot output"); | |
3384 | ||
3385 | /* Ignore if snapshot consumer output is not network. */ | |
3386 | if (snap_output->consumer->type != CONSUMER_DST_NET) { | |
3387 | goto error; | |
3388 | } | |
3389 | ||
3390 | /* | |
3391 | * For each consumer socket, create and send the relayd object of the | |
3392 | * snapshot output. | |
3393 | */ | |
3394 | rcu_read_lock(); | |
5eecee74 DG |
3395 | cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter, |
3396 | socket, node.node) { | |
6dc3064a | 3397 | ret = send_consumer_relayd_sockets(0, session->id, |
d3e2ba59 JD |
3398 | snap_output->consumer, socket, |
3399 | session->name, session->hostname, | |
3400 | session->live_timer); | |
a934f4af | 3401 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3402 | rcu_read_unlock(); |
3403 | goto error; | |
3404 | } | |
3405 | } | |
3406 | rcu_read_unlock(); | |
3407 | ||
3408 | error: | |
3409 | return ret; | |
3410 | } | |
3411 | ||
3412 | /* | |
3413 | * Record a kernel snapshot. | |
3414 | * | |
fac41e72 | 3415 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a DG |
3416 | */ |
3417 | static int record_kernel_snapshot(struct ltt_kernel_session *ksess, | |
5c786ded | 3418 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3419 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3420 | { |
3421 | int ret; | |
3422 | ||
3423 | assert(ksess); | |
3424 | assert(output); | |
3425 | assert(session); | |
3426 | ||
10a50311 JD |
3427 | /* Get the datetime for the snapshot output directory. */ |
3428 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime, | |
3429 | sizeof(output->datetime)); | |
3430 | if (!ret) { | |
a934f4af | 3431 | ret = LTTNG_ERR_INVALID; |
10a50311 JD |
3432 | goto error; |
3433 | } | |
3434 | ||
af706bb7 DG |
3435 | /* |
3436 | * Copy kernel session sockets so we can communicate with the right | |
3437 | * consumer for the snapshot record command. | |
3438 | */ | |
3439 | ret = consumer_copy_sockets(output->consumer, ksess->consumer); | |
3440 | if (ret < 0) { | |
a934f4af | 3441 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3442 | goto error; |
6dc3064a DG |
3443 | } |
3444 | ||
3445 | ret = set_relayd_for_snapshot(ksess->consumer, output, session); | |
a934f4af | 3446 | if (ret != LTTNG_OK) { |
af706bb7 | 3447 | goto error_snapshot; |
6dc3064a DG |
3448 | } |
3449 | ||
d07ceecd | 3450 | ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream); |
2a06df8d | 3451 | if (ret != LTTNG_OK) { |
af706bb7 | 3452 | goto error_snapshot; |
6dc3064a DG |
3453 | } |
3454 | ||
a934f4af | 3455 | ret = LTTNG_OK; |
1371fc12 | 3456 | goto end; |
a934f4af | 3457 | |
af706bb7 DG |
3458 | error_snapshot: |
3459 | /* Clean up copied sockets so this output can use some other later on. */ | |
3460 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a | 3461 | error: |
1371fc12 | 3462 | end: |
6dc3064a DG |
3463 | return ret; |
3464 | } | |
3465 | ||
3466 | /* | |
3467 | * Record a UST snapshot. | |
3468 | * | |
a934f4af | 3469 | * Return 0 on success or a LTTNG_ERR error code. |
6dc3064a DG |
3470 | */ |
3471 | static int record_ust_snapshot(struct ltt_ust_session *usess, | |
5c786ded | 3472 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3473 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3474 | { |
3475 | int ret; | |
3476 | ||
3477 | assert(usess); | |
3478 | assert(output); | |
3479 | assert(session); | |
3480 | ||
10a50311 JD |
3481 | /* Get the datetime for the snapshot output directory. */ |
3482 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime, | |
3483 | sizeof(output->datetime)); | |
3484 | if (!ret) { | |
a934f4af | 3485 | ret = LTTNG_ERR_INVALID; |
10a50311 JD |
3486 | goto error; |
3487 | } | |
3488 | ||
af706bb7 | 3489 | /* |
d3f14b8a | 3490 | * Copy UST session sockets so we can communicate with the right |
af706bb7 DG |
3491 | * consumer for the snapshot record command. |
3492 | */ | |
3493 | ret = consumer_copy_sockets(output->consumer, usess->consumer); | |
3494 | if (ret < 0) { | |
a934f4af | 3495 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3496 | goto error; |
6dc3064a DG |
3497 | } |
3498 | ||
3499 | ret = set_relayd_for_snapshot(usess->consumer, output, session); | |
a934f4af | 3500 | if (ret != LTTNG_OK) { |
af706bb7 | 3501 | goto error_snapshot; |
6dc3064a DG |
3502 | } |
3503 | ||
d07ceecd | 3504 | ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream); |
6dc3064a | 3505 | if (ret < 0) { |
7badf927 DG |
3506 | switch (-ret) { |
3507 | case EINVAL: | |
a934f4af | 3508 | ret = LTTNG_ERR_INVALID; |
7badf927 DG |
3509 | break; |
3510 | case ENODATA: | |
3511 | ret = LTTNG_ERR_SNAPSHOT_NODATA; | |
3512 | break; | |
3513 | default: | |
3514 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
3515 | break; | |
5c786ded | 3516 | } |
af706bb7 | 3517 | goto error_snapshot; |
6dc3064a DG |
3518 | } |
3519 | ||
a934f4af DG |
3520 | ret = LTTNG_OK; |
3521 | ||
af706bb7 DG |
3522 | error_snapshot: |
3523 | /* Clean up copied sockets so this output can use some other later on. */ | |
3524 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a DG |
3525 | error: |
3526 | return ret; | |
3527 | } | |
3528 | ||
d07ceecd MD |
3529 | static |
3530 | uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session, | |
3531 | uint64_t cur_nr_packets) | |
68808f4e | 3532 | { |
d07ceecd | 3533 | uint64_t tot_size = 0; |
68808f4e DG |
3534 | |
3535 | if (session->kernel_session) { | |
3536 | struct ltt_kernel_channel *chan; | |
3537 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3538 | ||
68808f4e | 3539 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
d07ceecd MD |
3540 | if (cur_nr_packets >= chan->channel->attr.num_subbuf) { |
3541 | /* | |
3542 | * Don't take channel into account if we | |
3543 | * already grab all its packets. | |
3544 | */ | |
3545 | continue; | |
68808f4e | 3546 | } |
d07ceecd MD |
3547 | tot_size += chan->channel->attr.subbuf_size |
3548 | * chan->stream_count; | |
68808f4e DG |
3549 | } |
3550 | } | |
3551 | ||
3552 | if (session->ust_session) { | |
68808f4e DG |
3553 | struct ltt_ust_session *usess = session->ust_session; |
3554 | ||
d07ceecd MD |
3555 | tot_size += ust_app_get_size_one_more_packet_per_stream(usess, |
3556 | cur_nr_packets); | |
68808f4e DG |
3557 | } |
3558 | ||
d07ceecd | 3559 | return tot_size; |
68808f4e DG |
3560 | } |
3561 | ||
5c786ded | 3562 | /* |
d07ceecd MD |
3563 | * Calculate the number of packets we can grab from each stream that |
3564 | * fits within the overall snapshot max size. | |
3565 | * | |
3566 | * Returns -1 on error, 0 means infinite number of packets, else > 0 is | |
3567 | * the number of packets per stream. | |
3568 | * | |
3569 | * TODO: this approach is not perfect: we consider the worse case | |
3570 | * (packet filling the sub-buffers) as an upper bound, but we could do | |
3571 | * better if we do this calculation while we actually grab the packet | |
3572 | * content: we would know how much padding we don't actually store into | |
3573 | * the file. | |
3574 | * | |
3575 | * This algorithm is currently bounded by the number of packets per | |
3576 | * stream. | |
3577 | * | |
3578 | * Since we call this algorithm before actually grabbing the data, it's | |
3579 | * an approximation: for instance, applications could appear/disappear | |
3580 | * in between this call and actually grabbing data. | |
5c786ded | 3581 | */ |
d07ceecd MD |
3582 | static |
3583 | int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size) | |
5c786ded | 3584 | { |
d07ceecd MD |
3585 | int64_t size_left; |
3586 | uint64_t cur_nb_packets = 0; | |
5c786ded | 3587 | |
d07ceecd MD |
3588 | if (!max_size) { |
3589 | return 0; /* Infinite */ | |
5c786ded JD |
3590 | } |
3591 | ||
d07ceecd MD |
3592 | size_left = max_size; |
3593 | for (;;) { | |
3594 | uint64_t one_more_packet_tot_size; | |
5c786ded | 3595 | |
d07ceecd MD |
3596 | one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session, |
3597 | cur_nb_packets); | |
3598 | if (!one_more_packet_tot_size) { | |
3599 | /* We are already grabbing all packets. */ | |
3600 | break; | |
3601 | } | |
3602 | size_left -= one_more_packet_tot_size; | |
3603 | if (size_left < 0) { | |
3604 | break; | |
3605 | } | |
3606 | cur_nb_packets++; | |
5c786ded | 3607 | } |
d07ceecd MD |
3608 | if (!cur_nb_packets) { |
3609 | /* Not enough room to grab one packet of each stream, error. */ | |
3610 | return -1; | |
3611 | } | |
3612 | return cur_nb_packets; | |
5c786ded JD |
3613 | } |
3614 | ||
6dc3064a DG |
3615 | /* |
3616 | * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl. | |
3617 | * | |
3618 | * The wait parameter is ignored so this call always wait for the snapshot to | |
3619 | * complete before returning. | |
3620 | * | |
3621 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3622 | */ | |
3623 | int cmd_snapshot_record(struct ltt_session *session, | |
3624 | struct lttng_snapshot_output *output, int wait) | |
3625 | { | |
3626 | int ret = LTTNG_OK; | |
e1986656 DG |
3627 | unsigned int use_tmp_output = 0; |
3628 | struct snapshot_output tmp_output; | |
00e1dfc4 | 3629 | unsigned int snapshot_success = 0; |
6dc3064a DG |
3630 | |
3631 | assert(session); | |
ba45d9f0 | 3632 | assert(output); |
6dc3064a DG |
3633 | |
3634 | DBG("Cmd snapshot record for session %s", session->name); | |
3635 | ||
3636 | /* | |
d3f14b8a MD |
3637 | * Permission denied to create an output if the session is not |
3638 | * set in no output mode. | |
6dc3064a DG |
3639 | */ |
3640 | if (session->output_traces) { | |
3641 | ret = LTTNG_ERR_EPERM; | |
3642 | goto error; | |
3643 | } | |
3644 | ||
3645 | /* The session needs to be started at least once. */ | |
8382cf6f | 3646 | if (!session->has_been_started) { |
6dc3064a DG |
3647 | ret = LTTNG_ERR_START_SESSION_ONCE; |
3648 | goto error; | |
3649 | } | |
3650 | ||
3651 | /* Use temporary output for the session. */ | |
ba45d9f0 | 3652 | if (*output->ctrl_url != '\0') { |
6dc3064a DG |
3653 | ret = snapshot_output_init(output->max_size, output->name, |
3654 | output->ctrl_url, output->data_url, session->consumer, | |
e1986656 | 3655 | &tmp_output, NULL); |
6dc3064a DG |
3656 | if (ret < 0) { |
3657 | if (ret == -ENOMEM) { | |
3658 | ret = LTTNG_ERR_NOMEM; | |
3659 | } else { | |
3660 | ret = LTTNG_ERR_INVALID; | |
3661 | } | |
3662 | goto error; | |
3663 | } | |
1bfe7328 DG |
3664 | /* Use the global session count for the temporary snapshot. */ |
3665 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; | |
e1986656 | 3666 | use_tmp_output = 1; |
6dc3064a DG |
3667 | } |
3668 | ||
3669 | if (session->kernel_session) { | |
3670 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3671 | ||
e1986656 | 3672 | if (use_tmp_output) { |
d07ceecd MD |
3673 | int64_t nb_packets_per_stream; |
3674 | ||
3675 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
3676 | tmp_output.max_size); | |
3677 | if (nb_packets_per_stream < 0) { | |
3678 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
3679 | goto error; | |
3680 | } | |
e1986656 | 3681 | ret = record_kernel_snapshot(ksess, &tmp_output, session, |
d07ceecd | 3682 | wait, nb_packets_per_stream); |
a934f4af | 3683 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3684 | goto error; |
3685 | } | |
1bfe7328 | 3686 | snapshot_success = 1; |
6dc3064a DG |
3687 | } else { |
3688 | struct snapshot_output *sout; | |
3689 | struct lttng_ht_iter iter; | |
3690 | ||
3691 | rcu_read_lock(); | |
3692 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
3693 | &iter.iter, sout, node.node) { | |
d07ceecd MD |
3694 | int64_t nb_packets_per_stream; |
3695 | ||
e1986656 DG |
3696 | /* |
3697 | * Make a local copy of the output and assign the possible | |
3698 | * temporary value given by the caller. | |
3699 | */ | |
3700 | memset(&tmp_output, 0, sizeof(tmp_output)); | |
3701 | memcpy(&tmp_output, sout, sizeof(tmp_output)); | |
3702 | ||
e1986656 DG |
3703 | if (output->max_size != (uint64_t) -1ULL) { |
3704 | tmp_output.max_size = output->max_size; | |
3705 | } | |
3706 | ||
d07ceecd MD |
3707 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, |
3708 | tmp_output.max_size); | |
3709 | if (nb_packets_per_stream < 0) { | |
68808f4e DG |
3710 | ret = LTTNG_ERR_MAX_SIZE_INVALID; |
3711 | goto error; | |
3712 | } | |
3713 | ||
e1986656 DG |
3714 | /* Use temporary name. */ |
3715 | if (*output->name != '\0') { | |
3716 | strncpy(tmp_output.name, output->name, | |
3717 | sizeof(tmp_output.name)); | |
3718 | } | |
3719 | ||
1bfe7328 DG |
3720 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; |
3721 | ||
e1986656 | 3722 | ret = record_kernel_snapshot(ksess, &tmp_output, |
d07ceecd | 3723 | session, wait, nb_packets_per_stream); |
a934f4af | 3724 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3725 | rcu_read_unlock(); |
3726 | goto error; | |
3727 | } | |
1bfe7328 | 3728 | snapshot_success = 1; |
6dc3064a DG |
3729 | } |
3730 | rcu_read_unlock(); | |
3731 | } | |
3732 | } | |
3733 | ||
3734 | if (session->ust_session) { | |
3735 | struct ltt_ust_session *usess = session->ust_session; | |
3736 | ||
e1986656 | 3737 | if (use_tmp_output) { |
d07ceecd MD |
3738 | int64_t nb_packets_per_stream; |
3739 | ||
3740 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
3741 | tmp_output.max_size); | |
3742 | if (nb_packets_per_stream < 0) { | |
3743 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
3744 | goto error; | |
3745 | } | |
e1986656 | 3746 | ret = record_ust_snapshot(usess, &tmp_output, session, |
d07ceecd | 3747 | wait, nb_packets_per_stream); |
a934f4af | 3748 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3749 | goto error; |
3750 | } | |
1bfe7328 | 3751 | snapshot_success = 1; |
6dc3064a DG |
3752 | } else { |
3753 | struct snapshot_output *sout; | |
3754 | struct lttng_ht_iter iter; | |
3755 | ||
3756 | rcu_read_lock(); | |
3757 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
3758 | &iter.iter, sout, node.node) { | |
d07ceecd MD |
3759 | int64_t nb_packets_per_stream; |
3760 | ||
e1986656 DG |
3761 | /* |
3762 | * Make a local copy of the output and assign the possible | |
3763 | * temporary value given by the caller. | |
3764 | */ | |
3765 | memset(&tmp_output, 0, sizeof(tmp_output)); | |
3766 | memcpy(&tmp_output, sout, sizeof(tmp_output)); | |
3767 | ||
e1986656 DG |
3768 | if (output->max_size != (uint64_t) -1ULL) { |
3769 | tmp_output.max_size = output->max_size; | |
3770 | } | |
3771 | ||
d07ceecd MD |
3772 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, |
3773 | tmp_output.max_size); | |
3774 | if (nb_packets_per_stream < 0) { | |
68808f4e | 3775 | ret = LTTNG_ERR_MAX_SIZE_INVALID; |
d07ceecd | 3776 | rcu_read_unlock(); |
68808f4e DG |
3777 | goto error; |
3778 | } | |
3779 | ||
e1986656 DG |
3780 | /* Use temporary name. */ |
3781 | if (*output->name != '\0') { | |
3782 | strncpy(tmp_output.name, output->name, | |
3783 | sizeof(tmp_output.name)); | |
3784 | } | |
3785 | ||
1bfe7328 DG |
3786 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; |
3787 | ||
e1986656 | 3788 | ret = record_ust_snapshot(usess, &tmp_output, session, |
d07ceecd | 3789 | wait, nb_packets_per_stream); |
a934f4af | 3790 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3791 | rcu_read_unlock(); |
3792 | goto error; | |
3793 | } | |
1bfe7328 | 3794 | snapshot_success = 1; |
6dc3064a DG |
3795 | } |
3796 | rcu_read_unlock(); | |
3797 | } | |
3798 | } | |
3799 | ||
1bfe7328 DG |
3800 | if (snapshot_success) { |
3801 | session->snapshot.nb_snapshot++; | |
b67578cb MD |
3802 | } else { |
3803 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
1bfe7328 DG |
3804 | } |
3805 | ||
6dc3064a | 3806 | error: |
6dc3064a DG |
3807 | return ret; |
3808 | } | |
3809 | ||
d7ba1388 MD |
3810 | /* |
3811 | * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread. | |
3812 | */ | |
3813 | int cmd_set_session_shm_path(struct ltt_session *session, | |
3814 | const char *shm_path) | |
3815 | { | |
3816 | /* Safety net */ | |
3817 | assert(session); | |
3818 | ||
3819 | /* | |
3820 | * Can only set shm path before session is started. | |
3821 | */ | |
3822 | if (session->has_been_started) { | |
3823 | return LTTNG_ERR_SESSION_STARTED; | |
3824 | } | |
3825 | ||
3826 | strncpy(session->shm_path, shm_path, | |
3827 | sizeof(session->shm_path)); | |
3828 | session->shm_path[sizeof(session->shm_path) - 1] = '\0'; | |
3829 | ||
3830 | return 0; | |
3831 | } | |
3832 | ||
2f77fc4b DG |
3833 | /* |
3834 | * Init command subsystem. | |
3835 | */ | |
3836 | void cmd_init(void) | |
3837 | { | |
3838 | /* | |
d88aee68 DG |
3839 | * Set network sequence index to 1 for streams to match a relayd |
3840 | * socket on the consumer side. | |
2f77fc4b | 3841 | */ |
d88aee68 DG |
3842 | pthread_mutex_lock(&relayd_net_seq_idx_lock); |
3843 | relayd_net_seq_idx = 1; | |
3844 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
3845 | |
3846 | DBG("Command subsystem initialized"); | |
3847 | } |