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> |
93ec662e | 31 | #include <common/kernel-ctl/kernel-ctl.h> |
db671df9 | 32 | #include <lttng/trigger/trigger-internal.h> |
2f77fc4b DG |
33 | |
34 | #include "channel.h" | |
35 | #include "consumer.h" | |
36 | #include "event.h" | |
8782cc74 | 37 | #include "health-sessiond.h" |
2f77fc4b DG |
38 | #include "kernel.h" |
39 | #include "kernel-consumer.h" | |
40 | #include "lttng-sessiond.h" | |
41 | #include "utils.h" | |
834978fd | 42 | #include "syscall.h" |
7c1d2758 | 43 | #include "agent.h" |
93ec662e | 44 | #include "buffer-registry.h" |
c254fb11 | 45 | #include "notification-thread.h" |
2f77fc4b DG |
46 | |
47 | #include "cmd.h" | |
48 | ||
49 | /* | |
50 | * Used to keep a unique index for each relayd socket created where this value | |
51 | * is associated with streams on the consumer so it can match the right relayd | |
d88aee68 DG |
52 | * to send to. It must be accessed with the relayd_net_seq_idx_lock |
53 | * held. | |
2f77fc4b | 54 | */ |
d88aee68 DG |
55 | static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER; |
56 | static uint64_t relayd_net_seq_idx; | |
2f77fc4b | 57 | |
7076b56e JG |
58 | static int validate_event_name(const char *); |
59 | static int validate_ust_event_name(const char *); | |
60 | static int cmd_enable_event_internal(struct ltt_session *session, | |
61 | struct lttng_domain *domain, | |
62 | char *channel_name, struct lttng_event *event, | |
63 | char *filter_expression, | |
64 | struct lttng_filter_bytecode *filter, | |
65 | struct lttng_event_exclusion *exclusion, | |
66 | int wpipe); | |
67 | ||
2f77fc4b DG |
68 | /* |
69 | * Create a session path used by list_lttng_sessions for the case that the | |
70 | * session consumer is on the network. | |
71 | */ | |
72 | static int build_network_session_path(char *dst, size_t size, | |
73 | struct ltt_session *session) | |
74 | { | |
75 | int ret, kdata_port, udata_port; | |
76 | struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL; | |
77 | char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX]; | |
78 | ||
79 | assert(session); | |
80 | assert(dst); | |
81 | ||
82 | memset(tmp_urls, 0, sizeof(tmp_urls)); | |
83 | memset(tmp_uurl, 0, sizeof(tmp_uurl)); | |
84 | ||
85 | kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT; | |
86 | ||
87 | if (session->kernel_session && session->kernel_session->consumer) { | |
88 | kuri = &session->kernel_session->consumer->dst.net.control; | |
89 | kdata_port = session->kernel_session->consumer->dst.net.data.port; | |
90 | } | |
91 | ||
92 | if (session->ust_session && session->ust_session->consumer) { | |
93 | uuri = &session->ust_session->consumer->dst.net.control; | |
94 | udata_port = session->ust_session->consumer->dst.net.data.port; | |
95 | } | |
96 | ||
97 | if (uuri == NULL && kuri == NULL) { | |
98 | uri = &session->consumer->dst.net.control; | |
99 | kdata_port = session->consumer->dst.net.data.port; | |
100 | } else if (kuri && uuri) { | |
101 | ret = uri_compare(kuri, uuri); | |
102 | if (ret) { | |
103 | /* Not Equal */ | |
104 | uri = kuri; | |
105 | /* Build uuri URL string */ | |
106 | ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl)); | |
107 | if (ret < 0) { | |
108 | goto error; | |
109 | } | |
110 | } else { | |
111 | uri = kuri; | |
112 | } | |
113 | } else if (kuri && uuri == NULL) { | |
114 | uri = kuri; | |
115 | } else if (uuri && kuri == NULL) { | |
116 | uri = uuri; | |
117 | } | |
118 | ||
119 | ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls)); | |
120 | if (ret < 0) { | |
121 | goto error; | |
122 | } | |
123 | ||
9aa9f900 DG |
124 | /* |
125 | * Do we have a UST url set. If yes, this means we have both kernel and UST | |
126 | * to print. | |
127 | */ | |
9d035200 | 128 | if (*tmp_uurl != '\0') { |
2f77fc4b DG |
129 | ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]", |
130 | tmp_urls, kdata_port, tmp_uurl, udata_port); | |
131 | } else { | |
9aa9f900 | 132 | int dport; |
bef08707 | 133 | if (kuri || (!kuri && !uuri)) { |
9aa9f900 DG |
134 | dport = kdata_port; |
135 | } else { | |
136 | /* No kernel URI, use the UST port. */ | |
137 | dport = udata_port; | |
138 | } | |
139 | ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport); | |
2f77fc4b DG |
140 | } |
141 | ||
142 | error: | |
143 | return ret; | |
144 | } | |
145 | ||
fb83fe64 JD |
146 | /* |
147 | * Get run-time attributes if the session has been started (discarded events, | |
148 | * lost packets). | |
149 | */ | |
150 | static int get_kernel_runtime_stats(struct ltt_session *session, | |
151 | struct ltt_kernel_channel *kchan, uint64_t *discarded_events, | |
152 | uint64_t *lost_packets) | |
153 | { | |
154 | int ret; | |
155 | ||
156 | if (!session->has_been_started) { | |
157 | ret = 0; | |
158 | *discarded_events = 0; | |
159 | *lost_packets = 0; | |
160 | goto end; | |
161 | } | |
162 | ||
163 | ret = consumer_get_discarded_events(session->id, kchan->fd, | |
164 | session->kernel_session->consumer, | |
165 | discarded_events); | |
166 | if (ret < 0) { | |
167 | goto end; | |
168 | } | |
169 | ||
170 | ret = consumer_get_lost_packets(session->id, kchan->fd, | |
171 | session->kernel_session->consumer, | |
172 | lost_packets); | |
173 | if (ret < 0) { | |
174 | goto end; | |
175 | } | |
176 | ||
177 | end: | |
178 | return ret; | |
179 | } | |
180 | ||
181 | /* | |
182 | * Get run-time attributes if the session has been started (discarded events, | |
183 | * lost packets). | |
184 | */ | |
185 | static int get_ust_runtime_stats(struct ltt_session *session, | |
186 | struct ltt_ust_channel *uchan, uint64_t *discarded_events, | |
187 | uint64_t *lost_packets) | |
188 | { | |
189 | int ret; | |
190 | struct ltt_ust_session *usess; | |
191 | ||
a91c5803 JG |
192 | if (!discarded_events || !lost_packets) { |
193 | ret = -1; | |
194 | goto end; | |
195 | } | |
196 | ||
fb83fe64 | 197 | usess = session->ust_session; |
a905c624 JG |
198 | assert(discarded_events); |
199 | assert(lost_packets); | |
fb83fe64 JD |
200 | |
201 | if (!usess || !session->has_been_started) { | |
202 | *discarded_events = 0; | |
203 | *lost_packets = 0; | |
204 | ret = 0; | |
205 | goto end; | |
206 | } | |
207 | ||
208 | if (usess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
209 | ret = ust_app_uid_get_channel_runtime_stats(usess->id, | |
210 | &usess->buffer_reg_uid_list, | |
211 | usess->consumer, uchan->id, | |
212 | uchan->attr.overwrite, | |
213 | discarded_events, | |
214 | lost_packets); | |
215 | } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
216 | ret = ust_app_pid_get_channel_runtime_stats(usess, | |
217 | uchan, usess->consumer, | |
218 | uchan->attr.overwrite, | |
219 | discarded_events, | |
220 | lost_packets); | |
221 | if (ret < 0) { | |
222 | goto end; | |
223 | } | |
224 | *discarded_events += uchan->per_pid_closed_app_discarded; | |
225 | *lost_packets += uchan->per_pid_closed_app_lost; | |
226 | } else { | |
227 | ERR("Unsupported buffer type"); | |
967bc289 | 228 | assert(0); |
fb83fe64 JD |
229 | ret = -1; |
230 | goto end; | |
231 | } | |
232 | ||
233 | end: | |
234 | return ret; | |
235 | } | |
236 | ||
2f77fc4b DG |
237 | /* |
238 | * Fill lttng_channel array of all channels. | |
239 | */ | |
56a37563 | 240 | static void list_lttng_channels(enum lttng_domain_type domain, |
fb83fe64 JD |
241 | struct ltt_session *session, struct lttng_channel *channels, |
242 | struct lttcomm_channel_extended *chan_exts) | |
2f77fc4b | 243 | { |
fb83fe64 | 244 | int i = 0, ret; |
2f77fc4b DG |
245 | struct ltt_kernel_channel *kchan; |
246 | ||
247 | DBG("Listing channels for session %s", session->name); | |
248 | ||
249 | switch (domain) { | |
250 | case LTTNG_DOMAIN_KERNEL: | |
251 | /* Kernel channels */ | |
252 | if (session->kernel_session != NULL) { | |
253 | cds_list_for_each_entry(kchan, | |
254 | &session->kernel_session->channel_list.head, list) { | |
fb83fe64 JD |
255 | uint64_t discarded_events, lost_packets; |
256 | ||
257 | ret = get_kernel_runtime_stats(session, kchan, | |
258 | &discarded_events, &lost_packets); | |
259 | if (ret < 0) { | |
260 | goto end; | |
261 | } | |
2f77fc4b DG |
262 | /* Copy lttng_channel struct to array */ |
263 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
264 | channels[i].enabled = kchan->enabled; | |
fb83fe64 JD |
265 | chan_exts[i].discarded_events = |
266 | discarded_events; | |
267 | chan_exts[i].lost_packets = lost_packets; | |
2f77fc4b DG |
268 | i++; |
269 | } | |
270 | } | |
271 | break; | |
272 | case LTTNG_DOMAIN_UST: | |
273 | { | |
274 | struct lttng_ht_iter iter; | |
275 | struct ltt_ust_channel *uchan; | |
276 | ||
e7fe706f | 277 | rcu_read_lock(); |
2f77fc4b DG |
278 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
279 | &iter.iter, uchan, node.node) { | |
a91c5803 | 280 | uint64_t discarded_events = 0, lost_packets = 0; |
fb83fe64 | 281 | |
8ee609c8 MD |
282 | if (lttng_strncpy(channels[i].name, uchan->name, |
283 | LTTNG_SYMBOL_NAME_LEN)) { | |
284 | break; | |
285 | } | |
2f77fc4b DG |
286 | channels[i].attr.overwrite = uchan->attr.overwrite; |
287 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
288 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
289 | channels[i].attr.switch_timer_interval = | |
290 | uchan->attr.switch_timer_interval; | |
291 | channels[i].attr.read_timer_interval = | |
292 | uchan->attr.read_timer_interval; | |
293 | channels[i].enabled = uchan->enabled; | |
2f785fe7 DG |
294 | channels[i].attr.tracefile_size = uchan->tracefile_size; |
295 | channels[i].attr.tracefile_count = uchan->tracefile_count; | |
5e4435a4 JG |
296 | |
297 | /* | |
298 | * Map enum lttng_ust_output to enum lttng_event_output. | |
299 | */ | |
2f77fc4b DG |
300 | switch (uchan->attr.output) { |
301 | case LTTNG_UST_MMAP: | |
2f77fc4b DG |
302 | channels[i].attr.output = LTTNG_EVENT_MMAP; |
303 | break; | |
5e4435a4 JG |
304 | default: |
305 | /* | |
306 | * LTTNG_UST_MMAP is the only supported UST | |
307 | * output mode. | |
308 | */ | |
309 | assert(0); | |
310 | break; | |
2f77fc4b | 311 | } |
fb83fe64 JD |
312 | |
313 | ret = get_ust_runtime_stats(session, uchan, | |
314 | &discarded_events, &lost_packets); | |
315 | if (ret < 0) { | |
316 | break; | |
317 | } | |
318 | chan_exts[i].discarded_events = discarded_events; | |
319 | chan_exts[i].lost_packets = lost_packets; | |
2f77fc4b DG |
320 | i++; |
321 | } | |
e7fe706f | 322 | rcu_read_unlock(); |
2f77fc4b DG |
323 | break; |
324 | } | |
325 | default: | |
326 | break; | |
327 | } | |
fb83fe64 JD |
328 | |
329 | end: | |
330 | return; | |
2f77fc4b DG |
331 | } |
332 | ||
b4e3ceb9 | 333 | static void increment_extended_len(const char *filter_expression, |
795d57ce | 334 | struct lttng_event_exclusion *exclusion, size_t *extended_len) |
b4e3ceb9 PP |
335 | { |
336 | *extended_len += sizeof(struct lttcomm_event_extended_header); | |
337 | ||
338 | if (filter_expression) { | |
339 | *extended_len += strlen(filter_expression) + 1; | |
340 | } | |
795d57ce PP |
341 | |
342 | if (exclusion) { | |
343 | *extended_len += exclusion->count * LTTNG_SYMBOL_NAME_LEN; | |
344 | } | |
b4e3ceb9 PP |
345 | } |
346 | ||
347 | static void append_extended_info(const char *filter_expression, | |
795d57ce | 348 | struct lttng_event_exclusion *exclusion, void **extended_at) |
b4e3ceb9 PP |
349 | { |
350 | struct lttcomm_event_extended_header extended_header; | |
351 | size_t filter_len = 0; | |
795d57ce | 352 | size_t nb_exclusions = 0; |
b4e3ceb9 PP |
353 | |
354 | if (filter_expression) { | |
355 | filter_len = strlen(filter_expression) + 1; | |
356 | } | |
357 | ||
795d57ce PP |
358 | if (exclusion) { |
359 | nb_exclusions = exclusion->count; | |
360 | } | |
361 | ||
362 | /* Set header fields */ | |
b4e3ceb9 | 363 | extended_header.filter_len = filter_len; |
795d57ce PP |
364 | extended_header.nb_exclusions = nb_exclusions; |
365 | ||
366 | /* Copy header */ | |
b4e3ceb9 PP |
367 | memcpy(*extended_at, &extended_header, sizeof(extended_header)); |
368 | *extended_at += sizeof(extended_header); | |
795d57ce PP |
369 | |
370 | /* Copy filter string */ | |
371 | if (filter_expression) { | |
372 | memcpy(*extended_at, filter_expression, filter_len); | |
373 | *extended_at += filter_len; | |
374 | } | |
375 | ||
376 | /* Copy exclusion names */ | |
377 | if (exclusion) { | |
378 | size_t len = nb_exclusions * LTTNG_SYMBOL_NAME_LEN; | |
379 | ||
380 | memcpy(*extended_at, &exclusion->names, len); | |
381 | *extended_at += len; | |
382 | } | |
b4e3ceb9 PP |
383 | } |
384 | ||
3c6a091f | 385 | /* |
022d91ba | 386 | * Create a list of agent domain events. |
3c6a091f DG |
387 | * |
388 | * Return number of events in list on success or else a negative value. | |
389 | */ | |
022d91ba | 390 | static int list_lttng_agent_events(struct agent *agt, |
b4e3ceb9 | 391 | struct lttng_event **events, size_t *total_size) |
3c6a091f DG |
392 | { |
393 | int i = 0, ret = 0; | |
394 | unsigned int nb_event = 0; | |
022d91ba | 395 | struct agent_event *event; |
3c6a091f DG |
396 | struct lttng_event *tmp_events; |
397 | struct lttng_ht_iter iter; | |
b4e3ceb9 PP |
398 | size_t extended_len = 0; |
399 | void *extended_at; | |
3c6a091f | 400 | |
022d91ba | 401 | assert(agt); |
3c6a091f DG |
402 | assert(events); |
403 | ||
022d91ba | 404 | DBG3("Listing agent events"); |
3c6a091f | 405 | |
e5bbf678 | 406 | rcu_read_lock(); |
022d91ba | 407 | nb_event = lttng_ht_get_count(agt->events); |
e5bbf678 | 408 | rcu_read_unlock(); |
3c6a091f DG |
409 | if (nb_event == 0) { |
410 | ret = nb_event; | |
b4e3ceb9 | 411 | *total_size = 0; |
3c6a091f DG |
412 | goto error; |
413 | } | |
414 | ||
b4e3ceb9 PP |
415 | /* Compute required extended infos size */ |
416 | extended_len = nb_event * sizeof(struct lttcomm_event_extended_header); | |
417 | ||
418 | /* | |
419 | * This is only valid because the commands which add events are | |
420 | * processed in the same thread as the listing. | |
421 | */ | |
422 | rcu_read_lock(); | |
423 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { | |
795d57ce PP |
424 | increment_extended_len(event->filter_expression, NULL, |
425 | &extended_len); | |
b4e3ceb9 PP |
426 | } |
427 | rcu_read_unlock(); | |
428 | ||
429 | *total_size = nb_event * sizeof(*tmp_events) + extended_len; | |
430 | tmp_events = zmalloc(*total_size); | |
3c6a091f | 431 | if (!tmp_events) { |
022d91ba | 432 | PERROR("zmalloc agent events session"); |
3c6a091f DG |
433 | ret = -LTTNG_ERR_FATAL; |
434 | goto error; | |
435 | } | |
436 | ||
b4e3ceb9 PP |
437 | extended_at = ((uint8_t *) tmp_events) + |
438 | nb_event * sizeof(struct lttng_event); | |
439 | ||
3c6a091f | 440 | rcu_read_lock(); |
022d91ba | 441 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
3c6a091f DG |
442 | strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name)); |
443 | tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0'; | |
444 | tmp_events[i].enabled = event->enabled; | |
2106efa0 | 445 | tmp_events[i].loglevel = event->loglevel_value; |
ff94328f | 446 | tmp_events[i].loglevel_type = event->loglevel_type; |
3c6a091f | 447 | i++; |
b4e3ceb9 PP |
448 | |
449 | /* Append extended info */ | |
795d57ce PP |
450 | append_extended_info(event->filter_expression, NULL, |
451 | &extended_at); | |
3c6a091f DG |
452 | } |
453 | rcu_read_unlock(); | |
454 | ||
455 | *events = tmp_events; | |
456 | ret = nb_event; | |
457 | ||
458 | error: | |
459 | assert(nb_event == i); | |
460 | return ret; | |
461 | } | |
462 | ||
2f77fc4b DG |
463 | /* |
464 | * Create a list of ust global domain events. | |
465 | */ | |
466 | static int list_lttng_ust_global_events(char *channel_name, | |
b4e3ceb9 PP |
467 | struct ltt_ust_domain_global *ust_global, |
468 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
469 | { |
470 | int i = 0, ret = 0; | |
471 | unsigned int nb_event = 0; | |
472 | struct lttng_ht_iter iter; | |
473 | struct lttng_ht_node_str *node; | |
474 | struct ltt_ust_channel *uchan; | |
475 | struct ltt_ust_event *uevent; | |
476 | struct lttng_event *tmp; | |
b4e3ceb9 PP |
477 | size_t extended_len = 0; |
478 | void *extended_at; | |
2f77fc4b DG |
479 | |
480 | DBG("Listing UST global events for channel %s", channel_name); | |
481 | ||
482 | rcu_read_lock(); | |
483 | ||
484 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); | |
485 | node = lttng_ht_iter_get_node_str(&iter); | |
486 | if (node == NULL) { | |
f73fabfd | 487 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
d31d3e8c | 488 | goto end; |
2f77fc4b DG |
489 | } |
490 | ||
491 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); | |
492 | ||
3c442be3 | 493 | nb_event = lttng_ht_get_count(uchan->events); |
2f77fc4b DG |
494 | if (nb_event == 0) { |
495 | ret = nb_event; | |
b4e3ceb9 | 496 | *total_size = 0; |
d31d3e8c | 497 | goto end; |
2f77fc4b DG |
498 | } |
499 | ||
500 | DBG3("Listing UST global %d events", nb_event); | |
501 | ||
b4e3ceb9 PP |
502 | /* Compute required extended infos size */ |
503 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { | |
504 | if (uevent->internal) { | |
505 | nb_event--; | |
506 | continue; | |
507 | } | |
508 | ||
509 | increment_extended_len(uevent->filter_expression, | |
795d57ce | 510 | uevent->exclusion, &extended_len); |
b4e3ceb9 | 511 | } |
d31d3e8c PP |
512 | if (nb_event == 0) { |
513 | /* All events are internal, skip. */ | |
514 | ret = 0; | |
515 | *total_size = 0; | |
516 | goto end; | |
517 | } | |
b4e3ceb9 PP |
518 | |
519 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
520 | tmp = zmalloc(*total_size); | |
2f77fc4b | 521 | if (tmp == NULL) { |
b12c38df JG |
522 | ret = -LTTNG_ERR_FATAL; |
523 | goto end; | |
2f77fc4b DG |
524 | } |
525 | ||
b4e3ceb9 PP |
526 | extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event); |
527 | ||
2f77fc4b | 528 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
3c442be3 JG |
529 | if (uevent->internal) { |
530 | /* This event should remain hidden from clients */ | |
3c442be3 JG |
531 | continue; |
532 | } | |
2f77fc4b DG |
533 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
534 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
535 | tmp[i].enabled = uevent->enabled; | |
536 | ||
537 | switch (uevent->attr.instrumentation) { | |
538 | case LTTNG_UST_TRACEPOINT: | |
539 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
540 | break; | |
541 | case LTTNG_UST_PROBE: | |
542 | tmp[i].type = LTTNG_EVENT_PROBE; | |
543 | break; | |
544 | case LTTNG_UST_FUNCTION: | |
545 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
546 | break; | |
547 | } | |
548 | ||
549 | tmp[i].loglevel = uevent->attr.loglevel; | |
550 | switch (uevent->attr.loglevel_type) { | |
551 | case LTTNG_UST_LOGLEVEL_ALL: | |
552 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
553 | break; | |
554 | case LTTNG_UST_LOGLEVEL_RANGE: | |
555 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; | |
556 | break; | |
557 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
558 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; | |
559 | break; | |
560 | } | |
561 | if (uevent->filter) { | |
562 | tmp[i].filter = 1; | |
563 | } | |
4634f12e JI |
564 | if (uevent->exclusion) { |
565 | tmp[i].exclusion = 1; | |
566 | } | |
2f77fc4b | 567 | i++; |
b4e3ceb9 PP |
568 | |
569 | /* Append extended info */ | |
795d57ce PP |
570 | append_extended_info(uevent->filter_expression, |
571 | uevent->exclusion, &extended_at); | |
2f77fc4b DG |
572 | } |
573 | ||
574 | ret = nb_event; | |
575 | *events = tmp; | |
d31d3e8c | 576 | end: |
2f77fc4b DG |
577 | rcu_read_unlock(); |
578 | return ret; | |
579 | } | |
580 | ||
581 | /* | |
582 | * Fill lttng_event array of all kernel events in the channel. | |
583 | */ | |
584 | static int list_lttng_kernel_events(char *channel_name, | |
b4e3ceb9 PP |
585 | struct ltt_kernel_session *kernel_session, |
586 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
587 | { |
588 | int i = 0, ret; | |
589 | unsigned int nb_event; | |
590 | struct ltt_kernel_event *event; | |
591 | struct ltt_kernel_channel *kchan; | |
b4e3ceb9 PP |
592 | size_t extended_len = 0; |
593 | void *extended_at; | |
2f77fc4b DG |
594 | |
595 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
596 | if (kchan == NULL) { | |
f73fabfd | 597 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
598 | goto error; |
599 | } | |
600 | ||
601 | nb_event = kchan->event_count; | |
602 | ||
603 | DBG("Listing events for channel %s", kchan->channel->name); | |
604 | ||
605 | if (nb_event == 0) { | |
b4e3ceb9 | 606 | *total_size = 0; |
834978fd | 607 | *events = NULL; |
db906c12 | 608 | goto end; |
2f77fc4b DG |
609 | } |
610 | ||
b4e3ceb9 PP |
611 | /* Compute required extended infos size */ |
612 | cds_list_for_each_entry(event, &kchan->events_list.head, list) { | |
795d57ce PP |
613 | increment_extended_len(event->filter_expression, NULL, |
614 | &extended_len); | |
b4e3ceb9 PP |
615 | } |
616 | ||
617 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
618 | *events = zmalloc(*total_size); | |
2f77fc4b | 619 | if (*events == NULL) { |
f73fabfd | 620 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
621 | goto error; |
622 | } | |
623 | ||
ab4aa612 | 624 | extended_at = ((void *) *events) + |
b4e3ceb9 PP |
625 | nb_event * sizeof(struct lttng_event); |
626 | ||
2f77fc4b DG |
627 | /* Kernel channels */ |
628 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
629 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
630 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
631 | (*events)[i].enabled = event->enabled; | |
00f992f2 JG |
632 | (*events)[i].filter = |
633 | (unsigned char) !!event->filter_expression; | |
2f77fc4b DG |
634 | |
635 | switch (event->event->instrumentation) { | |
636 | case LTTNG_KERNEL_TRACEPOINT: | |
637 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; | |
638 | break; | |
2f77fc4b | 639 | case LTTNG_KERNEL_KRETPROBE: |
1896972b DG |
640 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
641 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
642 | sizeof(struct lttng_kernel_kprobe)); | |
643 | break; | |
644 | case LTTNG_KERNEL_KPROBE: | |
2f77fc4b DG |
645 | (*events)[i].type = LTTNG_EVENT_PROBE; |
646 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
647 | sizeof(struct lttng_kernel_kprobe)); | |
648 | break; | |
649 | case LTTNG_KERNEL_FUNCTION: | |
650 | (*events)[i].type = LTTNG_EVENT_FUNCTION; | |
651 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
652 | sizeof(struct lttng_kernel_function)); | |
653 | break; | |
654 | case LTTNG_KERNEL_NOOP: | |
655 | (*events)[i].type = LTTNG_EVENT_NOOP; | |
656 | break; | |
657 | case LTTNG_KERNEL_SYSCALL: | |
658 | (*events)[i].type = LTTNG_EVENT_SYSCALL; | |
659 | break; | |
660 | case LTTNG_KERNEL_ALL: | |
661 | assert(0); | |
662 | break; | |
663 | } | |
664 | i++; | |
b4e3ceb9 PP |
665 | |
666 | /* Append extended info */ | |
795d57ce PP |
667 | append_extended_info(event->filter_expression, NULL, |
668 | &extended_at); | |
2f77fc4b DG |
669 | } |
670 | ||
db906c12 | 671 | end: |
2f77fc4b DG |
672 | return nb_event; |
673 | ||
674 | error: | |
f73fabfd DG |
675 | /* Negate the error code to differentiate the size from an error */ |
676 | return -ret; | |
2f77fc4b DG |
677 | } |
678 | ||
679 | /* | |
680 | * Add URI so the consumer output object. Set the correct path depending on the | |
681 | * domain adding the default trace directory. | |
682 | */ | |
683 | static int add_uri_to_consumer(struct consumer_output *consumer, | |
56a37563 JG |
684 | struct lttng_uri *uri, enum lttng_domain_type domain, |
685 | const char *session_name) | |
2f77fc4b | 686 | { |
f73fabfd | 687 | int ret = LTTNG_OK; |
2f77fc4b DG |
688 | const char *default_trace_dir; |
689 | ||
690 | assert(uri); | |
691 | ||
692 | if (consumer == NULL) { | |
693 | DBG("No consumer detected. Don't add URI. Stopping."); | |
f73fabfd | 694 | ret = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
695 | goto error; |
696 | } | |
697 | ||
698 | switch (domain) { | |
699 | case LTTNG_DOMAIN_KERNEL: | |
700 | default_trace_dir = DEFAULT_KERNEL_TRACE_DIR; | |
701 | break; | |
702 | case LTTNG_DOMAIN_UST: | |
703 | default_trace_dir = DEFAULT_UST_TRACE_DIR; | |
704 | break; | |
705 | default: | |
706 | /* | |
707 | * This case is possible is we try to add the URI to the global tracing | |
708 | * session consumer object which in this case there is no subdir. | |
709 | */ | |
710 | default_trace_dir = ""; | |
711 | } | |
712 | ||
713 | switch (uri->dtype) { | |
714 | case LTTNG_DST_IPV4: | |
715 | case LTTNG_DST_IPV6: | |
716 | DBG2("Setting network URI to consumer"); | |
717 | ||
df75acac DG |
718 | if (consumer->type == CONSUMER_DST_NET) { |
719 | if ((uri->stype == LTTNG_STREAM_CONTROL && | |
785d2d0d DG |
720 | consumer->dst.net.control_isset) || |
721 | (uri->stype == LTTNG_STREAM_DATA && | |
722 | consumer->dst.net.data_isset)) { | |
df75acac DG |
723 | ret = LTTNG_ERR_URL_EXIST; |
724 | goto error; | |
725 | } | |
726 | } else { | |
727 | memset(&consumer->dst.net, 0, sizeof(consumer->dst.net)); | |
785d2d0d DG |
728 | } |
729 | ||
df75acac DG |
730 | consumer->type = CONSUMER_DST_NET; |
731 | ||
2f77fc4b DG |
732 | /* Set URI into consumer output object */ |
733 | ret = consumer_set_network_uri(consumer, uri); | |
734 | if (ret < 0) { | |
a74934ba | 735 | ret = -ret; |
2f77fc4b DG |
736 | goto error; |
737 | } else if (ret == 1) { | |
738 | /* | |
739 | * URI was the same in the consumer so we do not append the subdir | |
740 | * again so to not duplicate output dir. | |
741 | */ | |
f86c9f4e | 742 | ret = LTTNG_OK; |
2f77fc4b DG |
743 | goto error; |
744 | } | |
745 | ||
746 | if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) { | |
747 | ret = consumer_set_subdir(consumer, session_name); | |
748 | if (ret < 0) { | |
f73fabfd | 749 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
750 | goto error; |
751 | } | |
752 | } | |
753 | ||
754 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
755 | /* On a new subdir, reappend the default trace dir. */ | |
c30ce0b3 CB |
756 | strncat(consumer->subdir, default_trace_dir, |
757 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
758 | DBG3("Append domain trace name to subdir %s", consumer->subdir); |
759 | } | |
760 | ||
761 | break; | |
762 | case LTTNG_DST_PATH: | |
763 | DBG2("Setting trace directory path from URI to %s", uri->dst.path); | |
764 | memset(consumer->dst.trace_path, 0, | |
765 | sizeof(consumer->dst.trace_path)); | |
9ac05d92 MD |
766 | /* Explicit length checks for strcpy and strcat. */ |
767 | if (strlen(uri->dst.path) + strlen(default_trace_dir) | |
768 | >= sizeof(consumer->dst.trace_path)) { | |
769 | ret = LTTNG_ERR_FATAL; | |
770 | goto error; | |
771 | } | |
772 | strcpy(consumer->dst.trace_path, uri->dst.path); | |
2f77fc4b | 773 | /* Append default trace dir */ |
9ac05d92 | 774 | strcat(consumer->dst.trace_path, default_trace_dir); |
2f77fc4b DG |
775 | /* Flag consumer as local. */ |
776 | consumer->type = CONSUMER_DST_LOCAL; | |
777 | break; | |
778 | } | |
779 | ||
a74934ba DG |
780 | ret = LTTNG_OK; |
781 | ||
2f77fc4b DG |
782 | error: |
783 | return ret; | |
784 | } | |
785 | ||
786 | /* | |
787 | * Init tracing by creating trace directory and sending fds kernel consumer. | |
788 | */ | |
789 | static int init_kernel_tracing(struct ltt_kernel_session *session) | |
790 | { | |
791 | int ret = 0; | |
792 | struct lttng_ht_iter iter; | |
793 | struct consumer_socket *socket; | |
794 | ||
795 | assert(session); | |
796 | ||
e7fe706f DG |
797 | rcu_read_lock(); |
798 | ||
2f77fc4b DG |
799 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { |
800 | cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter, | |
801 | socket, node.node) { | |
2f77fc4b | 802 | pthread_mutex_lock(socket->lock); |
f50f23d9 | 803 | ret = kernel_consumer_send_session(socket, session); |
2f77fc4b DG |
804 | pthread_mutex_unlock(socket->lock); |
805 | if (ret < 0) { | |
f73fabfd | 806 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
807 | goto error; |
808 | } | |
809 | } | |
810 | } | |
811 | ||
812 | error: | |
e7fe706f | 813 | rcu_read_unlock(); |
2f77fc4b DG |
814 | return ret; |
815 | } | |
816 | ||
817 | /* | |
818 | * Create a socket to the relayd using the URI. | |
819 | * | |
820 | * On success, the relayd_sock pointer is set to the created socket. | |
821 | * Else, it's stays untouched and a lttcomm error code is returned. | |
822 | */ | |
6151a90f | 823 | static int create_connect_relayd(struct lttng_uri *uri, |
b31610f2 JD |
824 | struct lttcomm_relayd_sock **relayd_sock, |
825 | struct consumer_output *consumer) | |
2f77fc4b DG |
826 | { |
827 | int ret; | |
6151a90f | 828 | struct lttcomm_relayd_sock *rsock; |
2f77fc4b | 829 | |
6151a90f JD |
830 | rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR, |
831 | RELAYD_VERSION_COMM_MINOR); | |
832 | if (!rsock) { | |
f73fabfd | 833 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
834 | goto error; |
835 | } | |
836 | ||
ffe60014 DG |
837 | /* |
838 | * Connect to relayd so we can proceed with a session creation. This call | |
839 | * can possibly block for an arbitrary amount of time to set the health | |
840 | * state to be in poll execution. | |
841 | */ | |
842 | health_poll_entry(); | |
6151a90f | 843 | ret = relayd_connect(rsock); |
ffe60014 | 844 | health_poll_exit(); |
2f77fc4b DG |
845 | if (ret < 0) { |
846 | ERR("Unable to reach lttng-relayd"); | |
f73fabfd | 847 | ret = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
848 | goto free_sock; |
849 | } | |
850 | ||
851 | /* Create socket for control stream. */ | |
852 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
853 | DBG3("Creating relayd stream socket from URI"); | |
854 | ||
855 | /* Check relayd version */ | |
6151a90f | 856 | ret = relayd_version_check(rsock); |
2f77fc4b | 857 | if (ret < 0) { |
f73fabfd | 858 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; |
2f77fc4b DG |
859 | goto close_sock; |
860 | } | |
b31610f2 JD |
861 | consumer->relay_major_version = rsock->major; |
862 | consumer->relay_minor_version = rsock->minor; | |
2f77fc4b DG |
863 | } else if (uri->stype == LTTNG_STREAM_DATA) { |
864 | DBG3("Creating relayd data socket from URI"); | |
865 | } else { | |
866 | /* Command is not valid */ | |
867 | ERR("Relayd invalid stream type: %d", uri->stype); | |
f73fabfd | 868 | ret = LTTNG_ERR_INVALID; |
2f77fc4b DG |
869 | goto close_sock; |
870 | } | |
871 | ||
6151a90f | 872 | *relayd_sock = rsock; |
2f77fc4b | 873 | |
f73fabfd | 874 | return LTTNG_OK; |
2f77fc4b DG |
875 | |
876 | close_sock: | |
6151a90f JD |
877 | /* The returned value is not useful since we are on an error path. */ |
878 | (void) relayd_close(rsock); | |
2f77fc4b | 879 | free_sock: |
6151a90f | 880 | free(rsock); |
2f77fc4b DG |
881 | error: |
882 | return ret; | |
883 | } | |
884 | ||
885 | /* | |
886 | * Connect to the relayd using URI and send the socket to the right consumer. | |
887 | */ | |
56a37563 JG |
888 | static int send_consumer_relayd_socket(enum lttng_domain_type domain, |
889 | unsigned int session_id, struct lttng_uri *relayd_uri, | |
890 | struct consumer_output *consumer, | |
d3e2ba59 JD |
891 | struct consumer_socket *consumer_sock, |
892 | char *session_name, char *hostname, int session_live_timer) | |
2f77fc4b DG |
893 | { |
894 | int ret; | |
6151a90f | 895 | struct lttcomm_relayd_sock *rsock = NULL; |
2f77fc4b | 896 | |
ffe60014 | 897 | /* Connect to relayd and make version check if uri is the control. */ |
b31610f2 | 898 | ret = create_connect_relayd(relayd_uri, &rsock, consumer); |
ffe60014 | 899 | if (ret != LTTNG_OK) { |
6151a90f | 900 | goto error; |
ffe60014 | 901 | } |
6151a90f | 902 | assert(rsock); |
ffe60014 | 903 | |
2f77fc4b | 904 | /* Set the network sequence index if not set. */ |
d88aee68 DG |
905 | if (consumer->net_seq_index == (uint64_t) -1ULL) { |
906 | pthread_mutex_lock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
907 | /* |
908 | * Increment net_seq_idx because we are about to transfer the | |
909 | * new relayd socket to the consumer. | |
d88aee68 | 910 | * Assign unique key so the consumer can match streams. |
2f77fc4b | 911 | */ |
d88aee68 DG |
912 | consumer->net_seq_index = ++relayd_net_seq_idx; |
913 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
914 | } |
915 | ||
2f77fc4b | 916 | /* Send relayd socket to consumer. */ |
6151a90f | 917 | ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer, |
d3e2ba59 JD |
918 | relayd_uri->stype, session_id, |
919 | session_name, hostname, session_live_timer); | |
2f77fc4b | 920 | if (ret < 0) { |
f73fabfd | 921 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
922 | goto close_sock; |
923 | } | |
924 | ||
c890b720 DG |
925 | /* Flag that the corresponding socket was sent. */ |
926 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
ffe60014 | 927 | consumer_sock->control_sock_sent = 1; |
c890b720 | 928 | } else if (relayd_uri->stype == LTTNG_STREAM_DATA) { |
ffe60014 | 929 | consumer_sock->data_sock_sent = 1; |
c890b720 DG |
930 | } |
931 | ||
f73fabfd | 932 | ret = LTTNG_OK; |
2f77fc4b DG |
933 | |
934 | /* | |
935 | * Close socket which was dup on the consumer side. The session daemon does | |
936 | * NOT keep track of the relayd socket(s) once transfer to the consumer. | |
937 | */ | |
938 | ||
939 | close_sock: | |
6151a90f JD |
940 | (void) relayd_close(rsock); |
941 | free(rsock); | |
2f77fc4b | 942 | |
6151a90f | 943 | error: |
ffe60014 DG |
944 | if (ret != LTTNG_OK) { |
945 | /* | |
d9078d0c DG |
946 | * The consumer output for this session should not be used anymore |
947 | * since the relayd connection failed thus making any tracing or/and | |
948 | * streaming not usable. | |
ffe60014 | 949 | */ |
d9078d0c | 950 | consumer->enabled = 0; |
ffe60014 | 951 | } |
2f77fc4b DG |
952 | return ret; |
953 | } | |
954 | ||
955 | /* | |
956 | * Send both relayd sockets to a specific consumer and domain. This is a | |
957 | * helper function to facilitate sending the information to the consumer for a | |
958 | * session. | |
959 | */ | |
56a37563 JG |
960 | static int send_consumer_relayd_sockets(enum lttng_domain_type domain, |
961 | unsigned int session_id, struct consumer_output *consumer, | |
962 | struct consumer_socket *sock, char *session_name, | |
963 | char *hostname, int session_live_timer) | |
2f77fc4b | 964 | { |
dda67f6c | 965 | int ret = LTTNG_OK; |
2f77fc4b | 966 | |
2f77fc4b | 967 | assert(consumer); |
6dc3064a | 968 | assert(sock); |
2f77fc4b | 969 | |
2f77fc4b | 970 | /* Sending control relayd socket. */ |
ffe60014 | 971 | if (!sock->control_sock_sent) { |
6dc3064a | 972 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
973 | &consumer->dst.net.control, consumer, sock, |
974 | session_name, hostname, session_live_timer); | |
c890b720 DG |
975 | if (ret != LTTNG_OK) { |
976 | goto error; | |
977 | } | |
2f77fc4b DG |
978 | } |
979 | ||
980 | /* Sending data relayd socket. */ | |
ffe60014 | 981 | if (!sock->data_sock_sent) { |
6dc3064a | 982 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
983 | &consumer->dst.net.data, consumer, sock, |
984 | session_name, hostname, session_live_timer); | |
c890b720 DG |
985 | if (ret != LTTNG_OK) { |
986 | goto error; | |
987 | } | |
2f77fc4b DG |
988 | } |
989 | ||
2f77fc4b DG |
990 | error: |
991 | return ret; | |
992 | } | |
993 | ||
994 | /* | |
995 | * Setup relayd connections for a tracing session. First creates the socket to | |
996 | * the relayd and send them to the right domain consumer. Consumer type MUST be | |
997 | * network. | |
998 | */ | |
ffe60014 | 999 | int cmd_setup_relayd(struct ltt_session *session) |
2f77fc4b | 1000 | { |
f73fabfd | 1001 | int ret = LTTNG_OK; |
2f77fc4b DG |
1002 | struct ltt_ust_session *usess; |
1003 | struct ltt_kernel_session *ksess; | |
1004 | struct consumer_socket *socket; | |
1005 | struct lttng_ht_iter iter; | |
1006 | ||
1007 | assert(session); | |
1008 | ||
1009 | usess = session->ust_session; | |
1010 | ksess = session->kernel_session; | |
1011 | ||
785d2d0d | 1012 | DBG("Setting relayd for session %s", session->name); |
2f77fc4b | 1013 | |
e7fe706f DG |
1014 | rcu_read_lock(); |
1015 | ||
2f77fc4b DG |
1016 | if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET |
1017 | && usess->consumer->enabled) { | |
1018 | /* For each consumer socket, send relayd sockets */ | |
1019 | cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, | |
1020 | socket, node.node) { | |
2f77fc4b | 1021 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1022 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id, |
d3e2ba59 JD |
1023 | usess->consumer, socket, |
1024 | session->name, session->hostname, | |
1025 | session->live_timer); | |
2f77fc4b | 1026 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1027 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1028 | goto error; |
1029 | } | |
6dc3064a DG |
1030 | /* Session is now ready for network streaming. */ |
1031 | session->net_handle = 1; | |
2f77fc4b | 1032 | } |
b31610f2 JD |
1033 | session->consumer->relay_major_version = |
1034 | usess->consumer->relay_major_version; | |
1035 | session->consumer->relay_minor_version = | |
1036 | usess->consumer->relay_minor_version; | |
2f77fc4b DG |
1037 | } |
1038 | ||
1039 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET | |
1040 | && ksess->consumer->enabled) { | |
1041 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1042 | socket, node.node) { | |
2f77fc4b | 1043 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1044 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id, |
d3e2ba59 JD |
1045 | ksess->consumer, socket, |
1046 | session->name, session->hostname, | |
1047 | session->live_timer); | |
2f77fc4b | 1048 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1049 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1050 | goto error; |
1051 | } | |
6dc3064a DG |
1052 | /* Session is now ready for network streaming. */ |
1053 | session->net_handle = 1; | |
2f77fc4b | 1054 | } |
b31610f2 JD |
1055 | session->consumer->relay_major_version = |
1056 | ksess->consumer->relay_major_version; | |
1057 | session->consumer->relay_minor_version = | |
1058 | ksess->consumer->relay_minor_version; | |
2f77fc4b DG |
1059 | } |
1060 | ||
1061 | error: | |
e7fe706f | 1062 | rcu_read_unlock(); |
2f77fc4b DG |
1063 | return ret; |
1064 | } | |
1065 | ||
9b6c7ec5 DG |
1066 | /* |
1067 | * Start a kernel session by opening all necessary streams. | |
1068 | */ | |
1069 | static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe) | |
1070 | { | |
1071 | int ret; | |
1072 | struct ltt_kernel_channel *kchan; | |
1073 | ||
1074 | /* Open kernel metadata */ | |
07b86b52 | 1075 | if (ksess->metadata == NULL && ksess->output_traces) { |
9b6c7ec5 DG |
1076 | ret = kernel_open_metadata(ksess); |
1077 | if (ret < 0) { | |
1078 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1079 | goto error; | |
1080 | } | |
1081 | } | |
1082 | ||
1083 | /* Open kernel metadata stream */ | |
07b86b52 | 1084 | if (ksess->metadata && ksess->metadata_stream_fd < 0) { |
9b6c7ec5 DG |
1085 | ret = kernel_open_metadata_stream(ksess); |
1086 | if (ret < 0) { | |
1087 | ERR("Kernel create metadata stream failed"); | |
1088 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1089 | goto error; | |
1090 | } | |
1091 | } | |
1092 | ||
1093 | /* For each channel */ | |
1094 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
1095 | if (kchan->stream_count == 0) { | |
1096 | ret = kernel_open_channel_stream(kchan); | |
1097 | if (ret < 0) { | |
1098 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1099 | goto error; | |
1100 | } | |
1101 | /* Update the stream global counter */ | |
1102 | ksess->stream_count_global += ret; | |
1103 | } | |
1104 | } | |
1105 | ||
1106 | /* Setup kernel consumer socket and send fds to it */ | |
1107 | ret = init_kernel_tracing(ksess); | |
e43c41c5 | 1108 | if (ret != 0) { |
9b6c7ec5 DG |
1109 | ret = LTTNG_ERR_KERN_START_FAIL; |
1110 | goto error; | |
1111 | } | |
1112 | ||
1113 | /* This start the kernel tracing */ | |
1114 | ret = kernel_start_session(ksess); | |
1115 | if (ret < 0) { | |
1116 | ret = LTTNG_ERR_KERN_START_FAIL; | |
1117 | goto error; | |
1118 | } | |
1119 | ||
1120 | /* Quiescent wait after starting trace */ | |
784303b0 | 1121 | kernel_wait_quiescent(kernel_tracer_fd); |
9b6c7ec5 | 1122 | |
14fb1ebe | 1123 | ksess->active = 1; |
9b6c7ec5 DG |
1124 | |
1125 | ret = LTTNG_OK; | |
1126 | ||
1127 | error: | |
1128 | return ret; | |
1129 | } | |
1130 | ||
2f77fc4b DG |
1131 | /* |
1132 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. | |
1133 | */ | |
56a37563 JG |
1134 | int cmd_disable_channel(struct ltt_session *session, |
1135 | enum lttng_domain_type domain, char *channel_name) | |
2f77fc4b DG |
1136 | { |
1137 | int ret; | |
1138 | struct ltt_ust_session *usess; | |
1139 | ||
1140 | usess = session->ust_session; | |
1141 | ||
2223c96f DG |
1142 | rcu_read_lock(); |
1143 | ||
2f77fc4b DG |
1144 | switch (domain) { |
1145 | case LTTNG_DOMAIN_KERNEL: | |
1146 | { | |
1147 | ret = channel_kernel_disable(session->kernel_session, | |
1148 | channel_name); | |
f73fabfd | 1149 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1150 | goto error; |
1151 | } | |
1152 | ||
1153 | kernel_wait_quiescent(kernel_tracer_fd); | |
1154 | break; | |
1155 | } | |
1156 | case LTTNG_DOMAIN_UST: | |
1157 | { | |
1158 | struct ltt_ust_channel *uchan; | |
1159 | struct lttng_ht *chan_ht; | |
1160 | ||
1161 | chan_ht = usess->domain_global.channels; | |
1162 | ||
1163 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
1164 | if (uchan == NULL) { | |
f73fabfd | 1165 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
1166 | goto error; |
1167 | } | |
1168 | ||
7972aab2 | 1169 | ret = channel_ust_disable(usess, uchan); |
f73fabfd | 1170 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1171 | goto error; |
1172 | } | |
1173 | break; | |
1174 | } | |
2f77fc4b | 1175 | default: |
f73fabfd | 1176 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1177 | goto error; |
1178 | } | |
1179 | ||
f73fabfd | 1180 | ret = LTTNG_OK; |
2f77fc4b DG |
1181 | |
1182 | error: | |
2223c96f | 1183 | rcu_read_unlock(); |
2f77fc4b DG |
1184 | return ret; |
1185 | } | |
1186 | ||
ccf10263 MD |
1187 | /* |
1188 | * Command LTTNG_TRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1189 | * |
1190 | * Called with session lock held. | |
ccf10263 | 1191 | */ |
56a37563 JG |
1192 | int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1193 | int pid) | |
ccf10263 MD |
1194 | { |
1195 | int ret; | |
1196 | ||
1197 | rcu_read_lock(); | |
1198 | ||
1199 | switch (domain) { | |
1200 | case LTTNG_DOMAIN_KERNEL: | |
1201 | { | |
1202 | struct ltt_kernel_session *ksess; | |
1203 | ||
1204 | ksess = session->kernel_session; | |
1205 | ||
1206 | ret = kernel_track_pid(ksess, pid); | |
1207 | if (ret != LTTNG_OK) { | |
1208 | goto error; | |
1209 | } | |
1210 | ||
1211 | kernel_wait_quiescent(kernel_tracer_fd); | |
1212 | break; | |
1213 | } | |
ccf10263 | 1214 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1215 | { |
1216 | struct ltt_ust_session *usess; | |
1217 | ||
1218 | usess = session->ust_session; | |
1219 | ||
1220 | ret = trace_ust_track_pid(usess, pid); | |
1221 | if (ret != LTTNG_OK) { | |
1222 | goto error; | |
1223 | } | |
1224 | break; | |
1225 | } | |
ccf10263 MD |
1226 | default: |
1227 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1228 | goto error; | |
1229 | } | |
1230 | ||
1231 | ret = LTTNG_OK; | |
1232 | ||
1233 | error: | |
1234 | rcu_read_unlock(); | |
1235 | return ret; | |
1236 | } | |
1237 | ||
1238 | /* | |
1239 | * Command LTTNG_UNTRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1240 | * |
1241 | * Called with session lock held. | |
ccf10263 | 1242 | */ |
56a37563 JG |
1243 | int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1244 | int pid) | |
ccf10263 MD |
1245 | { |
1246 | int ret; | |
1247 | ||
1248 | rcu_read_lock(); | |
1249 | ||
1250 | switch (domain) { | |
1251 | case LTTNG_DOMAIN_KERNEL: | |
1252 | { | |
1253 | struct ltt_kernel_session *ksess; | |
1254 | ||
1255 | ksess = session->kernel_session; | |
1256 | ||
1257 | ret = kernel_untrack_pid(ksess, pid); | |
1258 | if (ret != LTTNG_OK) { | |
1259 | goto error; | |
1260 | } | |
1261 | ||
1262 | kernel_wait_quiescent(kernel_tracer_fd); | |
1263 | break; | |
1264 | } | |
ccf10263 | 1265 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1266 | { |
1267 | struct ltt_ust_session *usess; | |
1268 | ||
1269 | usess = session->ust_session; | |
1270 | ||
1271 | ret = trace_ust_untrack_pid(usess, pid); | |
1272 | if (ret != LTTNG_OK) { | |
1273 | goto error; | |
1274 | } | |
1275 | break; | |
1276 | } | |
ccf10263 MD |
1277 | default: |
1278 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1279 | goto error; | |
1280 | } | |
1281 | ||
1282 | ret = LTTNG_OK; | |
1283 | ||
1284 | error: | |
1285 | rcu_read_unlock(); | |
1286 | return ret; | |
1287 | } | |
1288 | ||
2f77fc4b DG |
1289 | /* |
1290 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
1291 | * | |
1292 | * The wpipe arguments is used as a notifier for the kernel thread. | |
1293 | */ | |
1294 | int cmd_enable_channel(struct ltt_session *session, | |
7972aab2 | 1295 | struct lttng_domain *domain, struct lttng_channel *attr, int wpipe) |
2f77fc4b DG |
1296 | { |
1297 | int ret; | |
1298 | struct ltt_ust_session *usess = session->ust_session; | |
1299 | struct lttng_ht *chan_ht; | |
1f345e94 | 1300 | size_t len; |
2f77fc4b DG |
1301 | |
1302 | assert(session); | |
1303 | assert(attr); | |
7972aab2 | 1304 | assert(domain); |
2f77fc4b | 1305 | |
f5436bfc | 1306 | len = lttng_strnlen(attr->name, sizeof(attr->name)); |
1f345e94 PP |
1307 | |
1308 | /* Validate channel name */ | |
1309 | if (attr->name[0] == '.' || | |
1310 | memchr(attr->name, '/', len) != NULL) { | |
1311 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1312 | goto end; | |
1313 | } | |
1314 | ||
2f77fc4b DG |
1315 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
1316 | ||
03b4fdcf DG |
1317 | rcu_read_lock(); |
1318 | ||
ecc48a90 JD |
1319 | /* |
1320 | * Don't try to enable a channel if the session has been started at | |
1321 | * some point in time before. The tracer does not allow it. | |
1322 | */ | |
8382cf6f | 1323 | if (session->has_been_started) { |
ecc48a90 JD |
1324 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
1325 | goto error; | |
1326 | } | |
1327 | ||
1328 | /* | |
1329 | * If the session is a live session, remove the switch timer, the | |
1330 | * live timer does the same thing but sends also synchronisation | |
1331 | * beacons for inactive streams. | |
1332 | */ | |
1333 | if (session->live_timer > 0) { | |
1334 | attr->attr.live_timer_interval = session->live_timer; | |
1335 | attr->attr.switch_timer_interval = 0; | |
1336 | } | |
1337 | ||
7972aab2 | 1338 | switch (domain->type) { |
2f77fc4b DG |
1339 | case LTTNG_DOMAIN_KERNEL: |
1340 | { | |
1341 | struct ltt_kernel_channel *kchan; | |
1342 | ||
2f77fc4b DG |
1343 | kchan = trace_kernel_get_channel_by_name(attr->name, |
1344 | session->kernel_session); | |
1345 | if (kchan == NULL) { | |
1346 | ret = channel_kernel_create(session->kernel_session, attr, wpipe); | |
85076754 MD |
1347 | if (attr->name[0] != '\0') { |
1348 | session->kernel_session->has_non_default_channel = 1; | |
1349 | } | |
2f77fc4b DG |
1350 | } else { |
1351 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
1352 | } | |
1353 | ||
f73fabfd | 1354 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1355 | goto error; |
1356 | } | |
1357 | ||
784303b0 | 1358 | kernel_wait_quiescent(kernel_tracer_fd); |
2f77fc4b DG |
1359 | break; |
1360 | } | |
1361 | case LTTNG_DOMAIN_UST: | |
9232818f JG |
1362 | case LTTNG_DOMAIN_JUL: |
1363 | case LTTNG_DOMAIN_LOG4J: | |
1364 | case LTTNG_DOMAIN_PYTHON: | |
2f77fc4b DG |
1365 | { |
1366 | struct ltt_ust_channel *uchan; | |
1367 | ||
9232818f JG |
1368 | /* |
1369 | * FIXME | |
1370 | * | |
1371 | * Current agent implementation limitations force us to allow | |
1372 | * only one channel at once in "agent" subdomains. Each | |
1373 | * subdomain has a default channel name which must be strictly | |
1374 | * adhered to. | |
1375 | */ | |
1376 | if (domain->type == LTTNG_DOMAIN_JUL) { | |
1377 | if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME, | |
1378 | LTTNG_SYMBOL_NAME_LEN)) { | |
1379 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1380 | goto error; | |
1381 | } | |
1382 | } else if (domain->type == LTTNG_DOMAIN_LOG4J) { | |
1383 | if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME, | |
1384 | LTTNG_SYMBOL_NAME_LEN)) { | |
1385 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1386 | goto error; | |
1387 | } | |
1388 | } else if (domain->type == LTTNG_DOMAIN_PYTHON) { | |
1389 | if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME, | |
1390 | LTTNG_SYMBOL_NAME_LEN)) { | |
1391 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1392 | goto error; | |
1393 | } | |
1394 | } | |
1395 | ||
2f77fc4b DG |
1396 | chan_ht = usess->domain_global.channels; |
1397 | ||
1398 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); | |
1399 | if (uchan == NULL) { | |
7972aab2 | 1400 | ret = channel_ust_create(usess, attr, domain->buf_type); |
85076754 MD |
1401 | if (attr->name[0] != '\0') { |
1402 | usess->has_non_default_channel = 1; | |
1403 | } | |
2f77fc4b | 1404 | } else { |
7972aab2 | 1405 | ret = channel_ust_enable(usess, uchan); |
2f77fc4b DG |
1406 | } |
1407 | break; | |
1408 | } | |
2f77fc4b | 1409 | default: |
f73fabfd | 1410 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1411 | goto error; |
1412 | } | |
1413 | ||
1414 | error: | |
2223c96f | 1415 | rcu_read_unlock(); |
1f345e94 | 1416 | end: |
2f77fc4b DG |
1417 | return ret; |
1418 | } | |
1419 | ||
2f77fc4b DG |
1420 | /* |
1421 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1422 | */ | |
56a37563 JG |
1423 | int cmd_disable_event(struct ltt_session *session, |
1424 | enum lttng_domain_type domain, char *channel_name, | |
6e911cad | 1425 | struct lttng_event *event) |
2f77fc4b DG |
1426 | { |
1427 | int ret; | |
6e911cad MD |
1428 | char *event_name; |
1429 | ||
18a720cd MD |
1430 | DBG("Disable event command for event \'%s\'", event->name); |
1431 | ||
6e911cad | 1432 | event_name = event->name; |
7076b56e JG |
1433 | if (validate_event_name(event_name)) { |
1434 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1435 | goto error; | |
1436 | } | |
6e911cad | 1437 | |
9b7431cf JG |
1438 | /* Error out on unhandled search criteria */ |
1439 | if (event->loglevel_type || event->loglevel != -1 || event->enabled | |
6e911cad | 1440 | || event->pid || event->filter || event->exclusion) { |
7076b56e JG |
1441 | ret = LTTNG_ERR_UNK; |
1442 | goto error; | |
6e911cad | 1443 | } |
2f77fc4b | 1444 | |
2223c96f DG |
1445 | rcu_read_lock(); |
1446 | ||
2f77fc4b DG |
1447 | switch (domain) { |
1448 | case LTTNG_DOMAIN_KERNEL: | |
1449 | { | |
1450 | struct ltt_kernel_channel *kchan; | |
1451 | struct ltt_kernel_session *ksess; | |
1452 | ||
1453 | ksess = session->kernel_session; | |
1454 | ||
85076754 MD |
1455 | /* |
1456 | * If a non-default channel has been created in the | |
1457 | * session, explicitely require that -c chan_name needs | |
1458 | * to be provided. | |
1459 | */ | |
1460 | if (ksess->has_non_default_channel && channel_name[0] == '\0') { | |
1461 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1462 | goto error_unlock; |
85076754 MD |
1463 | } |
1464 | ||
2f77fc4b DG |
1465 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
1466 | if (kchan == NULL) { | |
f73fabfd | 1467 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
7076b56e | 1468 | goto error_unlock; |
2f77fc4b DG |
1469 | } |
1470 | ||
6e911cad MD |
1471 | switch (event->type) { |
1472 | case LTTNG_EVENT_ALL: | |
9550ee81 | 1473 | case LTTNG_EVENT_TRACEPOINT: |
d0ae4ea8 | 1474 | case LTTNG_EVENT_SYSCALL: |
9550ee81 JR |
1475 | case LTTNG_EVENT_PROBE: |
1476 | case LTTNG_EVENT_FUNCTION: | |
1477 | case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */ | |
1478 | if (event_name[0] == '\0') { | |
1479 | ret = event_kernel_disable_event(kchan, | |
1480 | NULL, event->type); | |
29c62722 | 1481 | } else { |
d0ae4ea8 | 1482 | ret = event_kernel_disable_event(kchan, |
9550ee81 | 1483 | event_name, event->type); |
29c62722 | 1484 | } |
6e911cad | 1485 | if (ret != LTTNG_OK) { |
7076b56e | 1486 | goto error_unlock; |
6e911cad MD |
1487 | } |
1488 | break; | |
6e911cad MD |
1489 | default: |
1490 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1491 | goto error_unlock; |
2f77fc4b DG |
1492 | } |
1493 | ||
1494 | kernel_wait_quiescent(kernel_tracer_fd); | |
1495 | break; | |
1496 | } | |
1497 | case LTTNG_DOMAIN_UST: | |
1498 | { | |
1499 | struct ltt_ust_channel *uchan; | |
1500 | struct ltt_ust_session *usess; | |
1501 | ||
1502 | usess = session->ust_session; | |
1503 | ||
7076b56e JG |
1504 | if (validate_ust_event_name(event_name)) { |
1505 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1506 | goto error_unlock; | |
1507 | } | |
1508 | ||
85076754 MD |
1509 | /* |
1510 | * If a non-default channel has been created in the | |
9550ee81 | 1511 | * session, explicitly require that -c chan_name needs |
85076754 MD |
1512 | * to be provided. |
1513 | */ | |
1514 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1515 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1516 | goto error_unlock; |
85076754 MD |
1517 | } |
1518 | ||
2f77fc4b DG |
1519 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
1520 | channel_name); | |
1521 | if (uchan == NULL) { | |
f73fabfd | 1522 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
7076b56e | 1523 | goto error_unlock; |
2f77fc4b DG |
1524 | } |
1525 | ||
6e911cad MD |
1526 | switch (event->type) { |
1527 | case LTTNG_EVENT_ALL: | |
b3639870 JR |
1528 | /* |
1529 | * An empty event name means that everything | |
1530 | * should be disabled. | |
1531 | */ | |
1532 | if (event->name[0] == '\0') { | |
1533 | ret = event_ust_disable_all_tracepoints(usess, uchan); | |
77d536b2 JR |
1534 | } else { |
1535 | ret = event_ust_disable_tracepoint(usess, uchan, | |
1536 | event_name); | |
1537 | } | |
6e911cad | 1538 | if (ret != LTTNG_OK) { |
7076b56e | 1539 | goto error_unlock; |
6e911cad MD |
1540 | } |
1541 | break; | |
1542 | default: | |
1543 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1544 | goto error_unlock; |
2f77fc4b DG |
1545 | } |
1546 | ||
1547 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
1548 | channel_name); | |
1549 | break; | |
1550 | } | |
5cdb6027 | 1551 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1552 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1553 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1554 | { |
fefd409b | 1555 | struct agent *agt; |
f20baf8e DG |
1556 | struct ltt_ust_session *usess = session->ust_session; |
1557 | ||
1558 | assert(usess); | |
1559 | ||
6e911cad MD |
1560 | switch (event->type) { |
1561 | case LTTNG_EVENT_ALL: | |
1562 | break; | |
1563 | default: | |
1564 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1565 | goto error_unlock; |
6e911cad MD |
1566 | } |
1567 | ||
5cdb6027 | 1568 | agt = trace_ust_find_agent(usess, domain); |
fefd409b DG |
1569 | if (!agt) { |
1570 | ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
7076b56e | 1571 | goto error_unlock; |
fefd409b | 1572 | } |
b3639870 JR |
1573 | /* |
1574 | * An empty event name means that everything | |
1575 | * should be disabled. | |
1576 | */ | |
1577 | if (event->name[0] == '\0') { | |
18a720cd MD |
1578 | ret = event_agent_disable_all(usess, agt); |
1579 | } else { | |
1580 | ret = event_agent_disable(usess, agt, event_name); | |
1581 | } | |
f20baf8e | 1582 | if (ret != LTTNG_OK) { |
7076b56e | 1583 | goto error_unlock; |
f20baf8e DG |
1584 | } |
1585 | ||
1586 | break; | |
1587 | } | |
2f77fc4b | 1588 | default: |
f73fabfd | 1589 | ret = LTTNG_ERR_UND; |
7076b56e | 1590 | goto error_unlock; |
2f77fc4b DG |
1591 | } |
1592 | ||
f73fabfd | 1593 | ret = LTTNG_OK; |
2f77fc4b | 1594 | |
7076b56e | 1595 | error_unlock: |
2223c96f | 1596 | rcu_read_unlock(); |
7076b56e | 1597 | error: |
2f77fc4b DG |
1598 | return ret; |
1599 | } | |
1600 | ||
2f77fc4b DG |
1601 | /* |
1602 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1603 | */ | |
56a37563 | 1604 | int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain, |
601d5acf | 1605 | char *channel_name, struct lttng_event_context *ctx, int kwpipe) |
2f77fc4b | 1606 | { |
d5979e4a | 1607 | int ret, chan_kern_created = 0, chan_ust_created = 0; |
bdf64013 JG |
1608 | char *app_ctx_provider_name = NULL, *app_ctx_name = NULL; |
1609 | ||
1610 | if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
1611 | app_ctx_provider_name = ctx->u.app_ctx.provider_name; | |
1612 | app_ctx_name = ctx->u.app_ctx.ctx_name; | |
1613 | } | |
2f77fc4b DG |
1614 | |
1615 | switch (domain) { | |
1616 | case LTTNG_DOMAIN_KERNEL: | |
979e618e DG |
1617 | assert(session->kernel_session); |
1618 | ||
1619 | if (session->kernel_session->channel_count == 0) { | |
1620 | /* Create default channel */ | |
1621 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); | |
1622 | if (ret != LTTNG_OK) { | |
1623 | goto error; | |
1624 | } | |
d5979e4a | 1625 | chan_kern_created = 1; |
979e618e | 1626 | } |
2f77fc4b | 1627 | /* Add kernel context to kernel tracer */ |
601d5acf | 1628 | ret = context_kernel_add(session->kernel_session, ctx, channel_name); |
f73fabfd | 1629 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1630 | goto error; |
1631 | } | |
1632 | break; | |
bdf64013 JG |
1633 | case LTTNG_DOMAIN_JUL: |
1634 | case LTTNG_DOMAIN_LOG4J: | |
1635 | { | |
1636 | /* | |
1637 | * Validate channel name. | |
1638 | * If no channel name is given and the domain is JUL or LOG4J, | |
1639 | * set it to the appropriate domain-specific channel name. If | |
1640 | * a name is provided but does not match the expexted channel | |
1641 | * name, return an error. | |
1642 | */ | |
1643 | if (domain == LTTNG_DOMAIN_JUL && *channel_name && | |
1644 | strcmp(channel_name, | |
1645 | DEFAULT_JUL_CHANNEL_NAME)) { | |
1646 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1647 | goto error; | |
1648 | } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name && | |
1649 | strcmp(channel_name, | |
1650 | DEFAULT_LOG4J_CHANNEL_NAME)) { | |
1651 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1652 | goto error; | |
1653 | } | |
a93b3916 | 1654 | /* break is _not_ missing here. */ |
bdf64013 | 1655 | } |
2f77fc4b DG |
1656 | case LTTNG_DOMAIN_UST: |
1657 | { | |
1658 | struct ltt_ust_session *usess = session->ust_session; | |
85076754 MD |
1659 | unsigned int chan_count; |
1660 | ||
2f77fc4b DG |
1661 | assert(usess); |
1662 | ||
85076754 | 1663 | chan_count = lttng_ht_get_count(usess->domain_global.channels); |
979e618e DG |
1664 | if (chan_count == 0) { |
1665 | struct lttng_channel *attr; | |
1666 | /* Create default channel */ | |
0a9c6494 | 1667 | attr = channel_new_default_attr(domain, usess->buffer_type); |
979e618e DG |
1668 | if (attr == NULL) { |
1669 | ret = LTTNG_ERR_FATAL; | |
1670 | goto error; | |
1671 | } | |
1672 | ||
7972aab2 | 1673 | ret = channel_ust_create(usess, attr, usess->buffer_type); |
979e618e DG |
1674 | if (ret != LTTNG_OK) { |
1675 | free(attr); | |
1676 | goto error; | |
1677 | } | |
1678 | free(attr); | |
d5979e4a | 1679 | chan_ust_created = 1; |
979e618e DG |
1680 | } |
1681 | ||
601d5acf | 1682 | ret = context_ust_add(usess, domain, ctx, channel_name); |
bdf64013 JG |
1683 | free(app_ctx_provider_name); |
1684 | free(app_ctx_name); | |
1685 | app_ctx_name = NULL; | |
1686 | app_ctx_provider_name = NULL; | |
f73fabfd | 1687 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1688 | goto error; |
1689 | } | |
1690 | break; | |
1691 | } | |
2f77fc4b | 1692 | default: |
f73fabfd | 1693 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1694 | goto error; |
1695 | } | |
1696 | ||
bdf64013 JG |
1697 | ret = LTTNG_OK; |
1698 | goto end; | |
2f77fc4b DG |
1699 | |
1700 | error: | |
d5979e4a DG |
1701 | if (chan_kern_created) { |
1702 | struct ltt_kernel_channel *kchan = | |
1703 | trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME, | |
1704 | session->kernel_session); | |
1705 | /* Created previously, this should NOT fail. */ | |
1706 | assert(kchan); | |
1707 | kernel_destroy_channel(kchan); | |
1708 | } | |
1709 | ||
1710 | if (chan_ust_created) { | |
1711 | struct ltt_ust_channel *uchan = | |
1712 | trace_ust_find_channel_by_name( | |
1713 | session->ust_session->domain_global.channels, | |
1714 | DEFAULT_CHANNEL_NAME); | |
1715 | /* Created previously, this should NOT fail. */ | |
1716 | assert(uchan); | |
1717 | /* Remove from the channel list of the session. */ | |
1718 | trace_ust_delete_channel(session->ust_session->domain_global.channels, | |
1719 | uchan); | |
1720 | trace_ust_destroy_channel(uchan); | |
1721 | } | |
bdf64013 JG |
1722 | end: |
1723 | free(app_ctx_provider_name); | |
1724 | free(app_ctx_name); | |
2f77fc4b DG |
1725 | return ret; |
1726 | } | |
1727 | ||
930a2e99 JG |
1728 | static int validate_event_name(const char *name) |
1729 | { | |
1730 | int ret = 0; | |
1731 | const char *c = name; | |
1732 | const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN; | |
bf9807db | 1733 | bool null_terminated = false; |
930a2e99 JG |
1734 | |
1735 | /* | |
1736 | * Make sure that unescaped wildcards are only used as the last | |
1737 | * character of the event name. | |
1738 | */ | |
1739 | while (c < event_name_end) { | |
1740 | switch (*c) { | |
1741 | case '\0': | |
bf9807db | 1742 | null_terminated = true; |
930a2e99 JG |
1743 | goto end; |
1744 | case '\\': | |
1745 | c++; | |
1746 | break; | |
1747 | case '*': | |
1748 | if ((c + 1) < event_name_end && *(c + 1)) { | |
1749 | /* Wildcard is not the last character */ | |
1750 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1751 | goto end; | |
1752 | } | |
1753 | default: | |
1754 | break; | |
1755 | } | |
1756 | c++; | |
1757 | } | |
1758 | end: | |
bf9807db JG |
1759 | if (!ret && !null_terminated) { |
1760 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1761 | } | |
930a2e99 JG |
1762 | return ret; |
1763 | } | |
1764 | ||
dac8e046 JG |
1765 | static inline bool name_starts_with(const char *name, const char *prefix) |
1766 | { | |
1767 | const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN); | |
1768 | ||
1769 | return !strncmp(name, prefix, max_cmp_len); | |
1770 | } | |
1771 | ||
1772 | /* Perform userspace-specific event name validation */ | |
1773 | static int validate_ust_event_name(const char *name) | |
1774 | { | |
1775 | int ret = 0; | |
1776 | ||
1777 | if (!name) { | |
1778 | ret = -1; | |
1779 | goto end; | |
1780 | } | |
1781 | ||
1782 | /* | |
1783 | * Check name against all internal UST event component namespaces used | |
1784 | * by the agents. | |
1785 | */ | |
1786 | if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) || | |
1787 | name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) || | |
1788 | name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) { | |
1789 | ret = -1; | |
1790 | } | |
1791 | ||
1792 | end: | |
1793 | return ret; | |
1794 | } | |
88f06f15 | 1795 | |
2f77fc4b | 1796 | /* |
88f06f15 JG |
1797 | * Internal version of cmd_enable_event() with a supplemental |
1798 | * "internal_event" flag which is used to enable internal events which should | |
1799 | * be hidden from clients. Such events are used in the agent implementation to | |
1800 | * enable the events through which all "agent" events are funeled. | |
2f77fc4b | 1801 | */ |
88f06f15 JG |
1802 | static int _cmd_enable_event(struct ltt_session *session, |
1803 | struct lttng_domain *domain, | |
025faf73 | 1804 | char *channel_name, struct lttng_event *event, |
6b453b5e | 1805 | char *filter_expression, |
db8f1377 JI |
1806 | struct lttng_filter_bytecode *filter, |
1807 | struct lttng_event_exclusion *exclusion, | |
88f06f15 | 1808 | int wpipe, bool internal_event) |
2f77fc4b | 1809 | { |
e5f5db7f | 1810 | int ret, channel_created = 0; |
cfedea03 | 1811 | struct lttng_channel *attr = NULL; |
2f77fc4b DG |
1812 | |
1813 | assert(session); | |
1814 | assert(event); | |
1815 | assert(channel_name); | |
1816 | ||
2a385866 JG |
1817 | /* If we have a filter, we must have its filter expression */ |
1818 | assert(!(!!filter_expression ^ !!filter)); | |
1819 | ||
18a720cd MD |
1820 | DBG("Enable event command for event \'%s\'", event->name); |
1821 | ||
f5ac4bd7 MD |
1822 | rcu_read_lock(); |
1823 | ||
930a2e99 JG |
1824 | ret = validate_event_name(event->name); |
1825 | if (ret) { | |
1826 | goto error; | |
1827 | } | |
1828 | ||
7972aab2 | 1829 | switch (domain->type) { |
2f77fc4b DG |
1830 | case LTTNG_DOMAIN_KERNEL: |
1831 | { | |
1832 | struct ltt_kernel_channel *kchan; | |
1833 | ||
85076754 MD |
1834 | /* |
1835 | * If a non-default channel has been created in the | |
1836 | * session, explicitely require that -c chan_name needs | |
1837 | * to be provided. | |
1838 | */ | |
1839 | if (session->kernel_session->has_non_default_channel | |
1840 | && channel_name[0] == '\0') { | |
1841 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1842 | goto error; | |
1843 | } | |
1844 | ||
2f77fc4b DG |
1845 | kchan = trace_kernel_get_channel_by_name(channel_name, |
1846 | session->kernel_session); | |
1847 | if (kchan == NULL) { | |
0a9c6494 DG |
1848 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
1849 | LTTNG_BUFFER_GLOBAL); | |
2f77fc4b | 1850 | if (attr == NULL) { |
f73fabfd | 1851 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1852 | goto error; |
1853 | } | |
04c17253 MD |
1854 | if (lttng_strncpy(attr->name, channel_name, |
1855 | sizeof(attr->name))) { | |
1856 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
1857 | goto error; |
1858 | } | |
2f77fc4b DG |
1859 | |
1860 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1861 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1862 | goto error; |
1863 | } | |
e5f5db7f | 1864 | channel_created = 1; |
2f77fc4b DG |
1865 | } |
1866 | ||
1867 | /* Get the newly created kernel channel pointer */ | |
1868 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1869 | session->kernel_session); | |
1870 | if (kchan == NULL) { | |
1871 | /* This sould not happen... */ | |
f73fabfd | 1872 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1873 | goto error; |
1874 | } | |
1875 | ||
6e911cad MD |
1876 | switch (event->type) { |
1877 | case LTTNG_EVENT_ALL: | |
29c62722 | 1878 | { |
00a62084 MD |
1879 | char *filter_expression_a = NULL; |
1880 | struct lttng_filter_bytecode *filter_a = NULL; | |
1881 | ||
1882 | /* | |
1883 | * We need to duplicate filter_expression and filter, | |
1884 | * because ownership is passed to first enable | |
1885 | * event. | |
1886 | */ | |
1887 | if (filter_expression) { | |
1888 | filter_expression_a = strdup(filter_expression); | |
1889 | if (!filter_expression_a) { | |
1890 | ret = LTTNG_ERR_FATAL; | |
1891 | goto error; | |
1892 | } | |
1893 | } | |
1894 | if (filter) { | |
1895 | filter_a = zmalloc(sizeof(*filter_a) + filter->len); | |
1896 | if (!filter_a) { | |
1897 | free(filter_expression_a); | |
1898 | ret = LTTNG_ERR_FATAL; | |
1899 | goto error; | |
1900 | } | |
1901 | memcpy(filter_a, filter, sizeof(*filter_a) + filter->len); | |
1902 | } | |
29c62722 | 1903 | event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */ |
00a62084 MD |
1904 | ret = event_kernel_enable_event(kchan, event, |
1905 | filter_expression, filter); | |
a969e101 MD |
1906 | /* We have passed ownership */ |
1907 | filter_expression = NULL; | |
1908 | filter = NULL; | |
29c62722 MD |
1909 | if (ret != LTTNG_OK) { |
1910 | if (channel_created) { | |
1911 | /* Let's not leak a useless channel. */ | |
1912 | kernel_destroy_channel(kchan); | |
1913 | } | |
00a62084 MD |
1914 | free(filter_expression_a); |
1915 | free(filter_a); | |
29c62722 MD |
1916 | goto error; |
1917 | } | |
1918 | event->type = LTTNG_EVENT_SYSCALL; /* Hack */ | |
00a62084 MD |
1919 | ret = event_kernel_enable_event(kchan, event, |
1920 | filter_expression_a, filter_a); | |
60d21fa2 AB |
1921 | /* We have passed ownership */ |
1922 | filter_expression_a = NULL; | |
1923 | filter_a = NULL; | |
29c62722 MD |
1924 | if (ret != LTTNG_OK) { |
1925 | goto error; | |
1926 | } | |
1927 | break; | |
1928 | } | |
6e6ef3d7 DG |
1929 | case LTTNG_EVENT_PROBE: |
1930 | case LTTNG_EVENT_FUNCTION: | |
1931 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
6e911cad | 1932 | case LTTNG_EVENT_TRACEPOINT: |
00a62084 MD |
1933 | ret = event_kernel_enable_event(kchan, event, |
1934 | filter_expression, filter); | |
a969e101 MD |
1935 | /* We have passed ownership */ |
1936 | filter_expression = NULL; | |
1937 | filter = NULL; | |
6e911cad MD |
1938 | if (ret != LTTNG_OK) { |
1939 | if (channel_created) { | |
1940 | /* Let's not leak a useless channel. */ | |
1941 | kernel_destroy_channel(kchan); | |
1942 | } | |
1943 | goto error; | |
e5f5db7f | 1944 | } |
6e911cad MD |
1945 | break; |
1946 | case LTTNG_EVENT_SYSCALL: | |
00a62084 MD |
1947 | ret = event_kernel_enable_event(kchan, event, |
1948 | filter_expression, filter); | |
a969e101 MD |
1949 | /* We have passed ownership */ |
1950 | filter_expression = NULL; | |
1951 | filter = NULL; | |
e2b957af MD |
1952 | if (ret != LTTNG_OK) { |
1953 | goto error; | |
1954 | } | |
6e911cad MD |
1955 | break; |
1956 | default: | |
1957 | ret = LTTNG_ERR_UNK; | |
2f77fc4b DG |
1958 | goto error; |
1959 | } | |
1960 | ||
1961 | kernel_wait_quiescent(kernel_tracer_fd); | |
1962 | break; | |
1963 | } | |
1964 | case LTTNG_DOMAIN_UST: | |
1965 | { | |
1966 | struct ltt_ust_channel *uchan; | |
1967 | struct ltt_ust_session *usess = session->ust_session; | |
1968 | ||
1969 | assert(usess); | |
1970 | ||
85076754 MD |
1971 | /* |
1972 | * If a non-default channel has been created in the | |
1973 | * session, explicitely require that -c chan_name needs | |
1974 | * to be provided. | |
1975 | */ | |
1976 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1977 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1978 | goto error; | |
1979 | } | |
1980 | ||
2f77fc4b DG |
1981 | /* Get channel from global UST domain */ |
1982 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
1983 | channel_name); | |
1984 | if (uchan == NULL) { | |
1985 | /* Create default channel */ | |
0a9c6494 DG |
1986 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
1987 | usess->buffer_type); | |
2f77fc4b | 1988 | if (attr == NULL) { |
f73fabfd | 1989 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1990 | goto error; |
1991 | } | |
04c17253 MD |
1992 | if (lttng_strncpy(attr->name, channel_name, |
1993 | sizeof(attr->name))) { | |
1994 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
1995 | goto error; |
1996 | } | |
2f77fc4b DG |
1997 | |
1998 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1999 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2000 | goto error; |
2001 | } | |
2f77fc4b DG |
2002 | |
2003 | /* Get the newly created channel reference back */ | |
2004 | uchan = trace_ust_find_channel_by_name( | |
2005 | usess->domain_global.channels, channel_name); | |
2006 | assert(uchan); | |
2007 | } | |
2008 | ||
141feb8c JG |
2009 | if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) { |
2010 | /* | |
2011 | * Don't allow users to add UST events to channels which | |
2012 | * are assigned to a userspace subdomain (JUL, Log4J, | |
2013 | * Python, etc.). | |
2014 | */ | |
2015 | ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN; | |
2016 | goto error; | |
2017 | } | |
2018 | ||
dac8e046 JG |
2019 | if (!internal_event) { |
2020 | /* | |
2021 | * Ensure the event name is not reserved for internal | |
2022 | * use. | |
2023 | */ | |
2024 | ret = validate_ust_event_name(event->name); | |
2025 | if (ret) { | |
2026 | WARN("Userspace event name %s failed validation.", | |
2027 | event->name ? | |
2028 | event->name : "NULL"); | |
2029 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
2030 | goto error; | |
2031 | } | |
2032 | } | |
2033 | ||
2f77fc4b | 2034 | /* At this point, the session and channel exist on the tracer */ |
6b453b5e | 2035 | ret = event_ust_enable_tracepoint(usess, uchan, event, |
88f06f15 JG |
2036 | filter_expression, filter, exclusion, |
2037 | internal_event); | |
49d21f93 MD |
2038 | /* We have passed ownership */ |
2039 | filter_expression = NULL; | |
2040 | filter = NULL; | |
2041 | exclusion = NULL; | |
94382e15 JG |
2042 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2043 | goto already_enabled; | |
2044 | } else if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2045 | goto error; |
2046 | } | |
2047 | break; | |
2048 | } | |
5cdb6027 | 2049 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 2050 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2051 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 2052 | { |
da6c3a50 | 2053 | const char *default_event_name, *default_chan_name; |
fefd409b | 2054 | struct agent *agt; |
f20baf8e DG |
2055 | struct lttng_event uevent; |
2056 | struct lttng_domain tmp_dom; | |
2057 | struct ltt_ust_session *usess = session->ust_session; | |
2058 | ||
2059 | assert(usess); | |
2060 | ||
5cdb6027 | 2061 | agt = trace_ust_find_agent(usess, domain->type); |
fefd409b | 2062 | if (!agt) { |
5cdb6027 | 2063 | agt = agent_create(domain->type); |
fefd409b | 2064 | if (!agt) { |
e5b3c48c | 2065 | ret = LTTNG_ERR_NOMEM; |
fefd409b DG |
2066 | goto error; |
2067 | } | |
2068 | agent_add(agt, usess->agents); | |
2069 | } | |
2070 | ||
022d91ba | 2071 | /* Create the default tracepoint. */ |
996de3c7 | 2072 | memset(&uevent, 0, sizeof(uevent)); |
f20baf8e DG |
2073 | uevent.type = LTTNG_EVENT_TRACEPOINT; |
2074 | uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
51755dc8 JG |
2075 | default_event_name = event_get_default_agent_ust_name( |
2076 | domain->type); | |
da6c3a50 | 2077 | if (!default_event_name) { |
e5b3c48c | 2078 | ret = LTTNG_ERR_FATAL; |
da6c3a50 | 2079 | goto error; |
f43f95a9 | 2080 | } |
da6c3a50 | 2081 | strncpy(uevent.name, default_event_name, sizeof(uevent.name)); |
f20baf8e DG |
2082 | uevent.name[sizeof(uevent.name) - 1] = '\0'; |
2083 | ||
2084 | /* | |
2085 | * The domain type is changed because we are about to enable the | |
2086 | * default channel and event for the JUL domain that are hardcoded. | |
2087 | * This happens in the UST domain. | |
2088 | */ | |
2089 | memcpy(&tmp_dom, domain, sizeof(tmp_dom)); | |
2090 | tmp_dom.type = LTTNG_DOMAIN_UST; | |
2091 | ||
0e115563 DG |
2092 | switch (domain->type) { |
2093 | case LTTNG_DOMAIN_LOG4J: | |
da6c3a50 | 2094 | default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME; |
0e115563 DG |
2095 | break; |
2096 | case LTTNG_DOMAIN_JUL: | |
da6c3a50 | 2097 | default_chan_name = DEFAULT_JUL_CHANNEL_NAME; |
0e115563 DG |
2098 | break; |
2099 | case LTTNG_DOMAIN_PYTHON: | |
2100 | default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
2101 | break; | |
2102 | default: | |
e98a44b0 | 2103 | /* The switch/case we are in makes this impossible */ |
0e115563 | 2104 | assert(0); |
da6c3a50 DG |
2105 | } |
2106 | ||
971da06a | 2107 | { |
8404118c | 2108 | char *filter_expression_copy = NULL; |
51755dc8 | 2109 | struct lttng_filter_bytecode *filter_copy = NULL; |
971da06a JG |
2110 | |
2111 | if (filter) { | |
51755dc8 JG |
2112 | const size_t filter_size = sizeof( |
2113 | struct lttng_filter_bytecode) | |
2114 | + filter->len; | |
2115 | ||
2116 | filter_copy = zmalloc(filter_size); | |
971da06a | 2117 | if (!filter_copy) { |
018096a4 | 2118 | ret = LTTNG_ERR_NOMEM; |
b742e3e2 | 2119 | goto error; |
971da06a | 2120 | } |
51755dc8 | 2121 | memcpy(filter_copy, filter, filter_size); |
971da06a | 2122 | |
8404118c JG |
2123 | filter_expression_copy = |
2124 | strdup(filter_expression); | |
2125 | if (!filter_expression) { | |
2126 | ret = LTTNG_ERR_NOMEM; | |
51755dc8 JG |
2127 | } |
2128 | ||
2129 | if (!filter_expression_copy || !filter_copy) { | |
2130 | free(filter_expression_copy); | |
2131 | free(filter_copy); | |
2132 | goto error; | |
8404118c | 2133 | } |
971da06a JG |
2134 | } |
2135 | ||
88f06f15 | 2136 | ret = cmd_enable_event_internal(session, &tmp_dom, |
971da06a | 2137 | (char *) default_chan_name, |
8404118c JG |
2138 | &uevent, filter_expression_copy, |
2139 | filter_copy, NULL, wpipe); | |
971da06a JG |
2140 | } |
2141 | ||
94382e15 JG |
2142 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2143 | goto already_enabled; | |
2144 | } else if (ret != LTTNG_OK) { | |
f20baf8e DG |
2145 | goto error; |
2146 | } | |
2147 | ||
2148 | /* The wild card * means that everything should be enabled. */ | |
2149 | if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) { | |
8404118c JG |
2150 | ret = event_agent_enable_all(usess, agt, event, filter, |
2151 | filter_expression); | |
f20baf8e | 2152 | } else { |
8404118c JG |
2153 | ret = event_agent_enable(usess, agt, event, filter, |
2154 | filter_expression); | |
f20baf8e | 2155 | } |
51755dc8 JG |
2156 | filter = NULL; |
2157 | filter_expression = NULL; | |
f20baf8e DG |
2158 | if (ret != LTTNG_OK) { |
2159 | goto error; | |
2160 | } | |
2161 | ||
2162 | break; | |
2163 | } | |
2f77fc4b | 2164 | default: |
f73fabfd | 2165 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2166 | goto error; |
2167 | } | |
2168 | ||
f73fabfd | 2169 | ret = LTTNG_OK; |
2f77fc4b | 2170 | |
94382e15 | 2171 | already_enabled: |
2f77fc4b | 2172 | error: |
49d21f93 MD |
2173 | free(filter_expression); |
2174 | free(filter); | |
2175 | free(exclusion); | |
cfedea03 | 2176 | free(attr); |
2223c96f | 2177 | rcu_read_unlock(); |
2f77fc4b DG |
2178 | return ret; |
2179 | } | |
2180 | ||
88f06f15 JG |
2181 | /* |
2182 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2183 | * We own filter, exclusion, and filter_expression. | |
2184 | */ | |
2185 | int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain, | |
2186 | char *channel_name, struct lttng_event *event, | |
2187 | char *filter_expression, | |
2188 | struct lttng_filter_bytecode *filter, | |
2189 | struct lttng_event_exclusion *exclusion, | |
2190 | int wpipe) | |
2191 | { | |
2192 | return _cmd_enable_event(session, domain, channel_name, event, | |
2193 | filter_expression, filter, exclusion, wpipe, false); | |
2194 | } | |
2195 | ||
2196 | /* | |
2197 | * Enable an event which is internal to LTTng. An internal should | |
2198 | * never be made visible to clients and are immune to checks such as | |
2199 | * reserved names. | |
2200 | */ | |
2201 | static int cmd_enable_event_internal(struct ltt_session *session, | |
2202 | struct lttng_domain *domain, | |
2203 | char *channel_name, struct lttng_event *event, | |
2204 | char *filter_expression, | |
2205 | struct lttng_filter_bytecode *filter, | |
2206 | struct lttng_event_exclusion *exclusion, | |
2207 | int wpipe) | |
2208 | { | |
2209 | return _cmd_enable_event(session, domain, channel_name, event, | |
2210 | filter_expression, filter, exclusion, wpipe, true); | |
2211 | } | |
2212 | ||
2f77fc4b DG |
2213 | /* |
2214 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2215 | */ | |
56a37563 JG |
2216 | ssize_t cmd_list_tracepoints(enum lttng_domain_type domain, |
2217 | struct lttng_event **events) | |
2f77fc4b DG |
2218 | { |
2219 | int ret; | |
2220 | ssize_t nb_events = 0; | |
2221 | ||
2222 | switch (domain) { | |
2223 | case LTTNG_DOMAIN_KERNEL: | |
2224 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2225 | if (nb_events < 0) { | |
f73fabfd | 2226 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
2f77fc4b DG |
2227 | goto error; |
2228 | } | |
2229 | break; | |
2230 | case LTTNG_DOMAIN_UST: | |
2231 | nb_events = ust_app_list_events(events); | |
2232 | if (nb_events < 0) { | |
f73fabfd | 2233 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2234 | goto error; |
2235 | } | |
2236 | break; | |
5cdb6027 | 2237 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2238 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2239 | case LTTNG_DOMAIN_PYTHON: |
f60140a1 | 2240 | nb_events = agent_list_events(events, domain); |
3c6a091f DG |
2241 | if (nb_events < 0) { |
2242 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2243 | goto error; | |
2244 | } | |
2245 | break; | |
2f77fc4b | 2246 | default: |
f73fabfd | 2247 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2248 | goto error; |
2249 | } | |
2250 | ||
2251 | return nb_events; | |
2252 | ||
2253 | error: | |
2254 | /* Return negative value to differentiate return code */ | |
2255 | return -ret; | |
2256 | } | |
2257 | ||
2258 | /* | |
2259 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
2260 | */ | |
56a37563 | 2261 | ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain, |
2f77fc4b DG |
2262 | struct lttng_event_field **fields) |
2263 | { | |
2264 | int ret; | |
2265 | ssize_t nb_fields = 0; | |
2266 | ||
2267 | switch (domain) { | |
2268 | case LTTNG_DOMAIN_UST: | |
2269 | nb_fields = ust_app_list_event_fields(fields); | |
2270 | if (nb_fields < 0) { | |
f73fabfd | 2271 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2272 | goto error; |
2273 | } | |
2274 | break; | |
2275 | case LTTNG_DOMAIN_KERNEL: | |
2276 | default: /* fall-through */ | |
f73fabfd | 2277 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2278 | goto error; |
2279 | } | |
2280 | ||
2281 | return nb_fields; | |
2282 | ||
2283 | error: | |
2284 | /* Return negative value to differentiate return code */ | |
2285 | return -ret; | |
2286 | } | |
2287 | ||
834978fd DG |
2288 | ssize_t cmd_list_syscalls(struct lttng_event **events) |
2289 | { | |
2290 | return syscall_table_list(events); | |
2291 | } | |
2292 | ||
a5dfbb9d MD |
2293 | /* |
2294 | * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread. | |
2295 | * | |
2296 | * Called with session lock held. | |
2297 | */ | |
2298 | ssize_t cmd_list_tracker_pids(struct ltt_session *session, | |
56a37563 | 2299 | enum lttng_domain_type domain, int32_t **pids) |
a5dfbb9d MD |
2300 | { |
2301 | int ret; | |
2302 | ssize_t nr_pids = 0; | |
2303 | ||
2304 | switch (domain) { | |
2305 | case LTTNG_DOMAIN_KERNEL: | |
2306 | { | |
2307 | struct ltt_kernel_session *ksess; | |
2308 | ||
2309 | ksess = session->kernel_session; | |
2310 | nr_pids = kernel_list_tracker_pids(ksess, pids); | |
2311 | if (nr_pids < 0) { | |
2312 | ret = LTTNG_ERR_KERN_LIST_FAIL; | |
2313 | goto error; | |
2314 | } | |
2315 | break; | |
2316 | } | |
2317 | case LTTNG_DOMAIN_UST: | |
2318 | { | |
2319 | struct ltt_ust_session *usess; | |
2320 | ||
2321 | usess = session->ust_session; | |
2322 | nr_pids = trace_ust_list_tracker_pids(usess, pids); | |
2323 | if (nr_pids < 0) { | |
2324 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2325 | goto error; | |
2326 | } | |
2327 | break; | |
2328 | } | |
2329 | case LTTNG_DOMAIN_LOG4J: | |
2330 | case LTTNG_DOMAIN_JUL: | |
2331 | case LTTNG_DOMAIN_PYTHON: | |
2332 | default: | |
2333 | ret = LTTNG_ERR_UND; | |
2334 | goto error; | |
2335 | } | |
2336 | ||
2337 | return nr_pids; | |
2338 | ||
2339 | error: | |
2340 | /* Return negative value to differentiate return code */ | |
2341 | return -ret; | |
2342 | } | |
2343 | ||
2f77fc4b DG |
2344 | /* |
2345 | * Command LTTNG_START_TRACE processed by the client thread. | |
a9ad0c8f MD |
2346 | * |
2347 | * Called with session mutex held. | |
2f77fc4b DG |
2348 | */ |
2349 | int cmd_start_trace(struct ltt_session *session) | |
2350 | { | |
2351 | int ret; | |
cde3e505 | 2352 | unsigned long nb_chan = 0; |
2f77fc4b DG |
2353 | struct ltt_kernel_session *ksession; |
2354 | struct ltt_ust_session *usess; | |
2f77fc4b DG |
2355 | |
2356 | assert(session); | |
2357 | ||
2358 | /* Ease our life a bit ;) */ | |
2359 | ksession = session->kernel_session; | |
2360 | usess = session->ust_session; | |
2361 | ||
8382cf6f DG |
2362 | /* Is the session already started? */ |
2363 | if (session->active) { | |
f73fabfd | 2364 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2365 | goto error; |
2366 | } | |
2367 | ||
cde3e505 DG |
2368 | /* |
2369 | * Starting a session without channel is useless since after that it's not | |
2370 | * possible to enable channel thus inform the client. | |
2371 | */ | |
2372 | if (usess && usess->domain_global.channels) { | |
2373 | nb_chan += lttng_ht_get_count(usess->domain_global.channels); | |
2374 | } | |
2375 | if (ksession) { | |
2376 | nb_chan += ksession->channel_count; | |
2377 | } | |
2378 | if (!nb_chan) { | |
2379 | ret = LTTNG_ERR_NO_CHANNEL; | |
2380 | goto error; | |
2381 | } | |
2382 | ||
2f77fc4b DG |
2383 | /* Kernel tracing */ |
2384 | if (ksession != NULL) { | |
9b6c7ec5 DG |
2385 | ret = start_kernel_session(ksession, kernel_tracer_fd); |
2386 | if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2387 | goto error; |
2388 | } | |
2f77fc4b DG |
2389 | } |
2390 | ||
2391 | /* Flag session that trace should start automatically */ | |
2392 | if (usess) { | |
14fb1ebe DG |
2393 | /* |
2394 | * Even though the start trace might fail, flag this session active so | |
2395 | * other application coming in are started by default. | |
2396 | */ | |
2397 | usess->active = 1; | |
2f77fc4b DG |
2398 | |
2399 | ret = ust_app_start_trace_all(usess); | |
2400 | if (ret < 0) { | |
f73fabfd | 2401 | ret = LTTNG_ERR_UST_START_FAIL; |
2f77fc4b DG |
2402 | goto error; |
2403 | } | |
2404 | } | |
2405 | ||
8382cf6f DG |
2406 | /* Flag this after a successful start. */ |
2407 | session->has_been_started = 1; | |
2408 | session->active = 1; | |
9b6c7ec5 | 2409 | |
f73fabfd | 2410 | ret = LTTNG_OK; |
2f77fc4b DG |
2411 | |
2412 | error: | |
2413 | return ret; | |
2414 | } | |
2415 | ||
2416 | /* | |
2417 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2418 | */ | |
2419 | int cmd_stop_trace(struct ltt_session *session) | |
2420 | { | |
2421 | int ret; | |
2422 | struct ltt_kernel_channel *kchan; | |
2423 | struct ltt_kernel_session *ksession; | |
2424 | struct ltt_ust_session *usess; | |
2425 | ||
2426 | assert(session); | |
2427 | ||
2428 | /* Short cut */ | |
2429 | ksession = session->kernel_session; | |
2430 | usess = session->ust_session; | |
2431 | ||
8382cf6f DG |
2432 | /* Session is not active. Skip everythong and inform the client. */ |
2433 | if (!session->active) { | |
f73fabfd | 2434 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
2f77fc4b DG |
2435 | goto error; |
2436 | } | |
2437 | ||
2f77fc4b | 2438 | /* Kernel tracer */ |
14fb1ebe | 2439 | if (ksession && ksession->active) { |
2f77fc4b DG |
2440 | DBG("Stop kernel tracing"); |
2441 | ||
566d8970 MD |
2442 | ret = kernel_stop_session(ksession); |
2443 | if (ret < 0) { | |
2444 | ret = LTTNG_ERR_KERN_STOP_FAIL; | |
2445 | goto error; | |
2446 | } | |
2447 | ||
2448 | kernel_wait_quiescent(kernel_tracer_fd); | |
2449 | ||
2450 | /* Flush metadata after stopping (if exists) */ | |
2f77fc4b DG |
2451 | if (ksession->metadata_stream_fd >= 0) { |
2452 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2453 | if (ret < 0) { | |
2454 | ERR("Kernel metadata flush failed"); | |
2455 | } | |
2456 | } | |
2457 | ||
566d8970 | 2458 | /* Flush all buffers after stopping */ |
2f77fc4b DG |
2459 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2460 | ret = kernel_flush_buffer(kchan); | |
2461 | if (ret < 0) { | |
2462 | ERR("Kernel flush buffer error"); | |
2463 | } | |
2464 | } | |
2465 | ||
14fb1ebe | 2466 | ksession->active = 0; |
2f77fc4b DG |
2467 | } |
2468 | ||
14fb1ebe DG |
2469 | if (usess && usess->active) { |
2470 | /* | |
2471 | * Even though the stop trace might fail, flag this session inactive so | |
2472 | * other application coming in are not started by default. | |
2473 | */ | |
2474 | usess->active = 0; | |
2f77fc4b DG |
2475 | |
2476 | ret = ust_app_stop_trace_all(usess); | |
2477 | if (ret < 0) { | |
f73fabfd | 2478 | ret = LTTNG_ERR_UST_STOP_FAIL; |
2f77fc4b DG |
2479 | goto error; |
2480 | } | |
2481 | } | |
2482 | ||
8382cf6f DG |
2483 | /* Flag inactive after a successful stop. */ |
2484 | session->active = 0; | |
f73fabfd | 2485 | ret = LTTNG_OK; |
2f77fc4b DG |
2486 | |
2487 | error: | |
2488 | return ret; | |
2489 | } | |
2490 | ||
2491 | /* | |
2492 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
2493 | */ | |
bda32d56 JG |
2494 | int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri, |
2495 | struct lttng_uri *uris) | |
2f77fc4b DG |
2496 | { |
2497 | int ret, i; | |
2498 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2499 | struct ltt_ust_session *usess = session->ust_session; | |
2f77fc4b DG |
2500 | |
2501 | assert(session); | |
2502 | assert(uris); | |
2503 | assert(nb_uri > 0); | |
2504 | ||
8382cf6f DG |
2505 | /* Can't set consumer URI if the session is active. */ |
2506 | if (session->active) { | |
f73fabfd | 2507 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2508 | goto error; |
2509 | } | |
2510 | ||
bda32d56 | 2511 | /* Set the "global" consumer URIs */ |
2f77fc4b | 2512 | for (i = 0; i < nb_uri; i++) { |
bda32d56 JG |
2513 | ret = add_uri_to_consumer(session->consumer, |
2514 | &uris[i], 0, session->name); | |
a74934ba | 2515 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2516 | goto error; |
2517 | } | |
2f77fc4b DG |
2518 | } |
2519 | ||
bda32d56 JG |
2520 | /* Set UST session URIs */ |
2521 | if (session->ust_session) { | |
2522 | for (i = 0; i < nb_uri; i++) { | |
2523 | ret = add_uri_to_consumer( | |
2524 | session->ust_session->consumer, | |
2525 | &uris[i], LTTNG_DOMAIN_UST, | |
2526 | session->name); | |
2527 | if (ret != LTTNG_OK) { | |
2528 | goto error; | |
2529 | } | |
2530 | } | |
2531 | } | |
2532 | ||
2533 | /* Set kernel session URIs */ | |
2534 | if (session->kernel_session) { | |
2535 | for (i = 0; i < nb_uri; i++) { | |
2536 | ret = add_uri_to_consumer( | |
2537 | session->kernel_session->consumer, | |
2538 | &uris[i], LTTNG_DOMAIN_KERNEL, | |
2539 | session->name); | |
2540 | if (ret != LTTNG_OK) { | |
2541 | goto error; | |
2542 | } | |
2543 | } | |
2544 | } | |
2545 | ||
7ab70fe0 DG |
2546 | /* |
2547 | * Make sure to set the session in output mode after we set URI since a | |
2548 | * session can be created without URL (thus flagged in no output mode). | |
2549 | */ | |
2550 | session->output_traces = 1; | |
2551 | if (ksess) { | |
2552 | ksess->output_traces = 1; | |
bda32d56 JG |
2553 | } |
2554 | ||
2555 | if (usess) { | |
7ab70fe0 DG |
2556 | usess->output_traces = 1; |
2557 | } | |
2558 | ||
2f77fc4b | 2559 | /* All good! */ |
f73fabfd | 2560 | ret = LTTNG_OK; |
2f77fc4b DG |
2561 | |
2562 | error: | |
2563 | return ret; | |
2564 | } | |
2565 | ||
2566 | /* | |
2567 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2568 | */ | |
2569 | int cmd_create_session_uri(char *name, struct lttng_uri *uris, | |
ecc48a90 | 2570 | size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer) |
2f77fc4b DG |
2571 | { |
2572 | int ret; | |
2f77fc4b DG |
2573 | struct ltt_session *session; |
2574 | ||
2575 | assert(name); | |
2bba9e53 | 2576 | assert(creds); |
785d2d0d | 2577 | |
2f77fc4b DG |
2578 | /* |
2579 | * Verify if the session already exist | |
2580 | * | |
2581 | * XXX: There is no need for the session lock list here since the caller | |
2582 | * (process_client_msg) is holding it. We might want to change that so a | |
2583 | * single command does not lock the entire session list. | |
2584 | */ | |
2585 | session = session_find_by_name(name); | |
2586 | if (session != NULL) { | |
f73fabfd | 2587 | ret = LTTNG_ERR_EXIST_SESS; |
2f77fc4b DG |
2588 | goto find_error; |
2589 | } | |
2590 | ||
2591 | /* Create tracing session in the registry */ | |
dec56f6c | 2592 | ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds), |
2f77fc4b | 2593 | LTTNG_SOCK_GET_GID_CRED(creds)); |
f73fabfd | 2594 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2595 | goto session_error; |
2596 | } | |
2597 | ||
2598 | /* | |
2599 | * Get the newly created session pointer back | |
2600 | * | |
2601 | * XXX: There is no need for the session lock list here since the caller | |
2602 | * (process_client_msg) is holding it. We might want to change that so a | |
2603 | * single command does not lock the entire session list. | |
2604 | */ | |
2605 | session = session_find_by_name(name); | |
2606 | assert(session); | |
2607 | ||
ecc48a90 | 2608 | session->live_timer = live_timer; |
2f77fc4b DG |
2609 | /* Create default consumer output for the session not yet created. */ |
2610 | session->consumer = consumer_create_output(CONSUMER_DST_LOCAL); | |
2611 | if (session->consumer == NULL) { | |
f73fabfd | 2612 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2613 | goto consumer_error; |
2614 | } | |
2615 | ||
2bba9e53 | 2616 | if (uris) { |
bda32d56 | 2617 | ret = cmd_set_consumer_uri(session, nb_uri, uris); |
2bba9e53 DG |
2618 | if (ret != LTTNG_OK) { |
2619 | goto consumer_error; | |
2620 | } | |
2621 | session->output_traces = 1; | |
2622 | } else { | |
2623 | session->output_traces = 0; | |
2624 | DBG2("Session %s created with no output", session->name); | |
2f77fc4b DG |
2625 | } |
2626 | ||
2627 | session->consumer->enabled = 1; | |
2628 | ||
f73fabfd | 2629 | return LTTNG_OK; |
2f77fc4b DG |
2630 | |
2631 | consumer_error: | |
2632 | session_destroy(session); | |
2633 | session_error: | |
2634 | find_error: | |
2635 | return ret; | |
2636 | } | |
2637 | ||
27babd3a DG |
2638 | /* |
2639 | * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread. | |
2640 | */ | |
2641 | int cmd_create_session_snapshot(char *name, struct lttng_uri *uris, | |
2642 | size_t nb_uri, lttng_sock_cred *creds) | |
2643 | { | |
2644 | int ret; | |
2645 | struct ltt_session *session; | |
2646 | struct snapshot_output *new_output = NULL; | |
2647 | ||
2648 | assert(name); | |
2649 | assert(creds); | |
2650 | ||
2651 | /* | |
2652 | * Create session in no output mode with URIs set to NULL. The uris we've | |
2653 | * received are for a default snapshot output if one. | |
2654 | */ | |
ae58b817 | 2655 | ret = cmd_create_session_uri(name, NULL, 0, creds, 0); |
27babd3a DG |
2656 | if (ret != LTTNG_OK) { |
2657 | goto error; | |
2658 | } | |
2659 | ||
2660 | /* Get the newly created session pointer back. This should NEVER fail. */ | |
2661 | session = session_find_by_name(name); | |
2662 | assert(session); | |
2663 | ||
2664 | /* Flag session for snapshot mode. */ | |
2665 | session->snapshot_mode = 1; | |
2666 | ||
2667 | /* Skip snapshot output creation if no URI is given. */ | |
2668 | if (nb_uri == 0) { | |
2669 | goto end; | |
2670 | } | |
2671 | ||
2672 | new_output = snapshot_output_alloc(); | |
2673 | if (!new_output) { | |
2674 | ret = LTTNG_ERR_NOMEM; | |
2675 | goto error_snapshot_alloc; | |
2676 | } | |
2677 | ||
2678 | ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL, | |
2679 | uris, nb_uri, session->consumer, new_output, &session->snapshot); | |
2680 | if (ret < 0) { | |
2681 | if (ret == -ENOMEM) { | |
2682 | ret = LTTNG_ERR_NOMEM; | |
2683 | } else { | |
2684 | ret = LTTNG_ERR_INVALID; | |
2685 | } | |
2686 | goto error_snapshot; | |
2687 | } | |
2688 | ||
2689 | rcu_read_lock(); | |
2690 | snapshot_add_output(&session->snapshot, new_output); | |
2691 | rcu_read_unlock(); | |
2692 | ||
2693 | end: | |
2694 | return LTTNG_OK; | |
2695 | ||
2696 | error_snapshot: | |
2697 | snapshot_output_destroy(new_output); | |
2698 | error_snapshot_alloc: | |
2699 | session_destroy(session); | |
2700 | error: | |
2701 | return ret; | |
2702 | } | |
2703 | ||
2f77fc4b DG |
2704 | /* |
2705 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
a9ad0c8f MD |
2706 | * |
2707 | * Called with session lock held. | |
2f77fc4b DG |
2708 | */ |
2709 | int cmd_destroy_session(struct ltt_session *session, int wpipe) | |
2710 | { | |
2711 | int ret; | |
2712 | struct ltt_ust_session *usess; | |
2713 | struct ltt_kernel_session *ksess; | |
2714 | ||
2715 | /* Safety net */ | |
2716 | assert(session); | |
2717 | ||
2718 | usess = session->ust_session; | |
2719 | ksess = session->kernel_session; | |
2720 | ||
2721 | /* Clean kernel session teardown */ | |
2722 | kernel_destroy_session(ksess); | |
2723 | ||
2724 | /* UST session teardown */ | |
2725 | if (usess) { | |
2726 | /* Close any relayd session */ | |
2727 | consumer_output_send_destroy_relayd(usess->consumer); | |
2728 | ||
2729 | /* Destroy every UST application related to this session. */ | |
2730 | ret = ust_app_destroy_trace_all(usess); | |
2731 | if (ret) { | |
2732 | ERR("Error in ust_app_destroy_trace_all"); | |
2733 | } | |
2734 | ||
2735 | /* Clean up the rest. */ | |
2736 | trace_ust_destroy_session(usess); | |
2737 | } | |
2738 | ||
2739 | /* | |
2740 | * Must notify the kernel thread here to update it's poll set in order to | |
2741 | * remove the channel(s)' fd just destroyed. | |
2742 | */ | |
2743 | ret = notify_thread_pipe(wpipe); | |
2744 | if (ret < 0) { | |
2745 | PERROR("write kernel poll pipe"); | |
2746 | } | |
2747 | ||
2748 | ret = session_destroy(session); | |
2749 | ||
2750 | return ret; | |
2751 | } | |
2752 | ||
2f77fc4b DG |
2753 | /* |
2754 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
2755 | */ | |
56a37563 JG |
2756 | int cmd_register_consumer(struct ltt_session *session, |
2757 | enum lttng_domain_type domain, const char *sock_path, | |
2758 | struct consumer_data *cdata) | |
2f77fc4b DG |
2759 | { |
2760 | int ret, sock; | |
dd81b457 | 2761 | struct consumer_socket *socket = NULL; |
2f77fc4b DG |
2762 | |
2763 | assert(session); | |
2764 | assert(cdata); | |
2765 | assert(sock_path); | |
2766 | ||
2767 | switch (domain) { | |
2768 | case LTTNG_DOMAIN_KERNEL: | |
2769 | { | |
2770 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2771 | ||
2772 | assert(ksess); | |
2773 | ||
2774 | /* Can't register a consumer if there is already one */ | |
2775 | if (ksess->consumer_fds_sent != 0) { | |
f73fabfd | 2776 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
2777 | goto error; |
2778 | } | |
2779 | ||
2780 | sock = lttcomm_connect_unix_sock(sock_path); | |
2781 | if (sock < 0) { | |
f73fabfd | 2782 | ret = LTTNG_ERR_CONNECT_FAIL; |
2f77fc4b DG |
2783 | goto error; |
2784 | } | |
4ce514c4 | 2785 | cdata->cmd_sock = sock; |
2f77fc4b | 2786 | |
4ce514c4 | 2787 | socket = consumer_allocate_socket(&cdata->cmd_sock); |
2f77fc4b | 2788 | if (socket == NULL) { |
f66c074c DG |
2789 | ret = close(sock); |
2790 | if (ret < 0) { | |
2791 | PERROR("close register consumer"); | |
2792 | } | |
4ce514c4 | 2793 | cdata->cmd_sock = -1; |
f73fabfd | 2794 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2795 | goto error; |
2796 | } | |
2797 | ||
2798 | socket->lock = zmalloc(sizeof(pthread_mutex_t)); | |
2799 | if (socket->lock == NULL) { | |
2800 | PERROR("zmalloc pthread mutex"); | |
f73fabfd | 2801 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2802 | goto error; |
2803 | } | |
2804 | pthread_mutex_init(socket->lock, NULL); | |
2805 | socket->registered = 1; | |
2806 | ||
2807 | rcu_read_lock(); | |
2808 | consumer_add_socket(socket, ksess->consumer); | |
2809 | rcu_read_unlock(); | |
2810 | ||
2811 | pthread_mutex_lock(&cdata->pid_mutex); | |
2812 | cdata->pid = -1; | |
2813 | pthread_mutex_unlock(&cdata->pid_mutex); | |
2814 | ||
2815 | break; | |
2816 | } | |
2817 | default: | |
2818 | /* TODO: Userspace tracing */ | |
f73fabfd | 2819 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2820 | goto error; |
2821 | } | |
2822 | ||
dd81b457 | 2823 | return LTTNG_OK; |
2f77fc4b DG |
2824 | |
2825 | error: | |
dd81b457 DG |
2826 | if (socket) { |
2827 | consumer_destroy_socket(socket); | |
2828 | } | |
2f77fc4b DG |
2829 | return ret; |
2830 | } | |
2831 | ||
2832 | /* | |
2833 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
2834 | */ | |
2835 | ssize_t cmd_list_domains(struct ltt_session *session, | |
2836 | struct lttng_domain **domains) | |
2837 | { | |
2838 | int ret, index = 0; | |
2839 | ssize_t nb_dom = 0; | |
fefd409b DG |
2840 | struct agent *agt; |
2841 | struct lttng_ht_iter iter; | |
2f77fc4b DG |
2842 | |
2843 | if (session->kernel_session != NULL) { | |
2844 | DBG3("Listing domains found kernel domain"); | |
2845 | nb_dom++; | |
2846 | } | |
2847 | ||
2848 | if (session->ust_session != NULL) { | |
2849 | DBG3("Listing domains found UST global domain"); | |
2850 | nb_dom++; | |
3c6a091f | 2851 | |
e0a74f01 | 2852 | rcu_read_lock(); |
fefd409b DG |
2853 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2854 | agt, node.node) { | |
2855 | if (agt->being_used) { | |
2856 | nb_dom++; | |
2857 | } | |
3c6a091f | 2858 | } |
e0a74f01 | 2859 | rcu_read_unlock(); |
2f77fc4b DG |
2860 | } |
2861 | ||
fa64dfb4 JG |
2862 | if (!nb_dom) { |
2863 | goto end; | |
2864 | } | |
2865 | ||
2f77fc4b DG |
2866 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
2867 | if (*domains == NULL) { | |
f73fabfd | 2868 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2869 | goto error; |
2870 | } | |
2871 | ||
2872 | if (session->kernel_session != NULL) { | |
2873 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
b5edb9e8 PP |
2874 | |
2875 | /* Kernel session buffer type is always GLOBAL */ | |
2876 | (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL; | |
2877 | ||
2f77fc4b DG |
2878 | index++; |
2879 | } | |
2880 | ||
2881 | if (session->ust_session != NULL) { | |
2882 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
88c5f0d8 | 2883 | (*domains)[index].buf_type = session->ust_session->buffer_type; |
2f77fc4b | 2884 | index++; |
3c6a091f | 2885 | |
e0a74f01 | 2886 | rcu_read_lock(); |
fefd409b DG |
2887 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2888 | agt, node.node) { | |
2889 | if (agt->being_used) { | |
2890 | (*domains)[index].type = agt->domain; | |
2891 | (*domains)[index].buf_type = session->ust_session->buffer_type; | |
2892 | index++; | |
2893 | } | |
3c6a091f | 2894 | } |
e0a74f01 | 2895 | rcu_read_unlock(); |
2f77fc4b | 2896 | } |
fa64dfb4 | 2897 | end: |
2f77fc4b DG |
2898 | return nb_dom; |
2899 | ||
2900 | error: | |
f73fabfd DG |
2901 | /* Return negative value to differentiate return code */ |
2902 | return -ret; | |
2f77fc4b DG |
2903 | } |
2904 | ||
2905 | ||
2906 | /* | |
2907 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
2908 | */ | |
56a37563 JG |
2909 | ssize_t cmd_list_channels(enum lttng_domain_type domain, |
2910 | struct ltt_session *session, struct lttng_channel **channels) | |
2f77fc4b | 2911 | { |
53e367f9 | 2912 | ssize_t nb_chan = 0, payload_size = 0, ret; |
2f77fc4b DG |
2913 | |
2914 | switch (domain) { | |
2915 | case LTTNG_DOMAIN_KERNEL: | |
2916 | if (session->kernel_session != NULL) { | |
2917 | nb_chan = session->kernel_session->channel_count; | |
2918 | } | |
2919 | DBG3("Number of kernel channels %zd", nb_chan); | |
c7d620a2 | 2920 | if (nb_chan <= 0) { |
53e367f9 JG |
2921 | ret = -LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2922 | goto end; | |
c7d620a2 | 2923 | } |
2f77fc4b DG |
2924 | break; |
2925 | case LTTNG_DOMAIN_UST: | |
2926 | if (session->ust_session != NULL) { | |
7ffc31a2 | 2927 | rcu_read_lock(); |
2f77fc4b | 2928 | nb_chan = lttng_ht_get_count( |
7ffc31a2 JG |
2929 | session->ust_session->domain_global.channels); |
2930 | rcu_read_unlock(); | |
2f77fc4b DG |
2931 | } |
2932 | DBG3("Number of UST global channels %zd", nb_chan); | |
ade7ce52 | 2933 | if (nb_chan < 0) { |
53e367f9 JG |
2934 | ret = -LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2935 | goto end; | |
c7d620a2 | 2936 | } |
2f77fc4b DG |
2937 | break; |
2938 | default: | |
53e367f9 JG |
2939 | ret = -LTTNG_ERR_UND; |
2940 | goto end; | |
2f77fc4b DG |
2941 | } |
2942 | ||
2943 | if (nb_chan > 0) { | |
53e367f9 JG |
2944 | const size_t channel_size = sizeof(struct lttng_channel) + |
2945 | sizeof(struct lttcomm_channel_extended); | |
2946 | struct lttcomm_channel_extended *channel_exts; | |
2947 | ||
2948 | payload_size = nb_chan * channel_size; | |
2949 | *channels = zmalloc(payload_size); | |
2f77fc4b | 2950 | if (*channels == NULL) { |
53e367f9 JG |
2951 | ret = -LTTNG_ERR_FATAL; |
2952 | goto end; | |
2f77fc4b DG |
2953 | } |
2954 | ||
53e367f9 JG |
2955 | channel_exts = ((void *) *channels) + |
2956 | (nb_chan * sizeof(struct lttng_channel)); | |
2957 | list_lttng_channels(domain, session, *channels, channel_exts); | |
2958 | } else { | |
2959 | *channels = NULL; | |
2f77fc4b DG |
2960 | } |
2961 | ||
53e367f9 JG |
2962 | ret = payload_size; |
2963 | end: | |
2964 | return ret; | |
2f77fc4b DG |
2965 | } |
2966 | ||
2967 | /* | |
2968 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
2969 | */ | |
56a37563 JG |
2970 | ssize_t cmd_list_events(enum lttng_domain_type domain, |
2971 | struct ltt_session *session, char *channel_name, | |
b4e3ceb9 | 2972 | struct lttng_event **events, size_t *total_size) |
2f77fc4b DG |
2973 | { |
2974 | int ret = 0; | |
2975 | ssize_t nb_event = 0; | |
2976 | ||
2977 | switch (domain) { | |
2978 | case LTTNG_DOMAIN_KERNEL: | |
2979 | if (session->kernel_session != NULL) { | |
2980 | nb_event = list_lttng_kernel_events(channel_name, | |
b4e3ceb9 PP |
2981 | session->kernel_session, events, |
2982 | total_size); | |
2f77fc4b DG |
2983 | } |
2984 | break; | |
2985 | case LTTNG_DOMAIN_UST: | |
2986 | { | |
2987 | if (session->ust_session != NULL) { | |
2988 | nb_event = list_lttng_ust_global_events(channel_name, | |
b4e3ceb9 PP |
2989 | &session->ust_session->domain_global, events, |
2990 | total_size); | |
2f77fc4b DG |
2991 | } |
2992 | break; | |
2993 | } | |
5cdb6027 | 2994 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2995 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2996 | case LTTNG_DOMAIN_PYTHON: |
3c6a091f | 2997 | if (session->ust_session) { |
fefd409b DG |
2998 | struct lttng_ht_iter iter; |
2999 | struct agent *agt; | |
3000 | ||
b11feea5 | 3001 | rcu_read_lock(); |
fefd409b DG |
3002 | cds_lfht_for_each_entry(session->ust_session->agents->ht, |
3003 | &iter.iter, agt, node.node) { | |
1dfd9906 JG |
3004 | if (agt->domain == domain) { |
3005 | nb_event = list_lttng_agent_events( | |
b4e3ceb9 PP |
3006 | agt, events, |
3007 | total_size); | |
1dfd9906 JG |
3008 | break; |
3009 | } | |
fefd409b | 3010 | } |
b11feea5 | 3011 | rcu_read_unlock(); |
3c6a091f DG |
3012 | } |
3013 | break; | |
2f77fc4b | 3014 | default: |
f73fabfd | 3015 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3016 | goto error; |
3017 | } | |
3018 | ||
f73fabfd | 3019 | return nb_event; |
2f77fc4b DG |
3020 | |
3021 | error: | |
f73fabfd DG |
3022 | /* Return negative value to differentiate return code */ |
3023 | return -ret; | |
2f77fc4b DG |
3024 | } |
3025 | ||
3026 | /* | |
3027 | * Using the session list, filled a lttng_session array to send back to the | |
3028 | * client for session listing. | |
3029 | * | |
3030 | * The session list lock MUST be acquired before calling this function. Use | |
3031 | * session_lock_list() and session_unlock_list(). | |
3032 | */ | |
3033 | void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid, | |
3034 | gid_t gid) | |
3035 | { | |
3036 | int ret; | |
3037 | unsigned int i = 0; | |
3038 | struct ltt_session *session; | |
3039 | struct ltt_session_list *list = session_get_list(); | |
3040 | ||
3041 | DBG("Getting all available session for UID %d GID %d", | |
3042 | uid, gid); | |
3043 | /* | |
3044 | * Iterate over session list and append data after the control struct in | |
3045 | * the buffer. | |
3046 | */ | |
3047 | cds_list_for_each_entry(session, &list->head, list) { | |
3048 | /* | |
3049 | * Only list the sessions the user can control. | |
3050 | */ | |
3051 | if (!session_access_ok(session, uid, gid)) { | |
3052 | continue; | |
3053 | } | |
3054 | ||
3055 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3056 | struct ltt_ust_session *usess = session->ust_session; | |
3057 | ||
3058 | if (session->consumer->type == CONSUMER_DST_NET || | |
3059 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
3060 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
3061 | ret = build_network_session_path(sessions[i].path, | |
dec56f6c | 3062 | sizeof(sessions[i].path), session); |
2f77fc4b | 3063 | } else { |
dec56f6c | 3064 | ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s", |
2f77fc4b DG |
3065 | session->consumer->dst.trace_path); |
3066 | } | |
3067 | if (ret < 0) { | |
3068 | PERROR("snprintf session path"); | |
3069 | continue; | |
3070 | } | |
3071 | ||
3072 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
3073 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
8382cf6f | 3074 | sessions[i].enabled = session->active; |
2cbf8fed | 3075 | sessions[i].snapshot_mode = session->snapshot_mode; |
8960e9cd | 3076 | sessions[i].live_timer_interval = session->live_timer; |
2f77fc4b DG |
3077 | i++; |
3078 | } | |
3079 | } | |
3080 | ||
806e2684 | 3081 | /* |
6d805429 | 3082 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
d3f14b8a | 3083 | * ready for trace analysis (or any kind of reader) or else 1 for pending data. |
806e2684 | 3084 | */ |
6d805429 | 3085 | int cmd_data_pending(struct ltt_session *session) |
806e2684 DG |
3086 | { |
3087 | int ret; | |
3088 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3089 | struct ltt_ust_session *usess = session->ust_session; | |
3090 | ||
3091 | assert(session); | |
3092 | ||
3093 | /* Session MUST be stopped to ask for data availability. */ | |
8382cf6f | 3094 | if (session->active) { |
806e2684 DG |
3095 | ret = LTTNG_ERR_SESSION_STARTED; |
3096 | goto error; | |
3a89d11a DG |
3097 | } else { |
3098 | /* | |
3099 | * If stopped, just make sure we've started before else the above call | |
3100 | * will always send that there is data pending. | |
3101 | * | |
3102 | * The consumer assumes that when the data pending command is received, | |
3103 | * the trace has been started before or else no output data is written | |
3104 | * by the streams which is a condition for data pending. So, this is | |
3105 | * *VERY* important that we don't ask the consumer before a start | |
3106 | * trace. | |
3107 | */ | |
8382cf6f | 3108 | if (!session->has_been_started) { |
3a89d11a DG |
3109 | ret = 0; |
3110 | goto error; | |
3111 | } | |
806e2684 DG |
3112 | } |
3113 | ||
3114 | if (ksess && ksess->consumer) { | |
6d805429 DG |
3115 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
3116 | if (ret == 1) { | |
806e2684 DG |
3117 | /* Data is still being extracted for the kernel. */ |
3118 | goto error; | |
3119 | } | |
3120 | } | |
3121 | ||
3122 | if (usess && usess->consumer) { | |
6d805429 DG |
3123 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
3124 | if (ret == 1) { | |
806e2684 DG |
3125 | /* Data is still being extracted for the kernel. */ |
3126 | goto error; | |
3127 | } | |
3128 | } | |
3129 | ||
3130 | /* Data is ready to be read by a viewer */ | |
6d805429 | 3131 | ret = 0; |
806e2684 DG |
3132 | |
3133 | error: | |
3134 | return ret; | |
3135 | } | |
3136 | ||
6dc3064a DG |
3137 | /* |
3138 | * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library. | |
3139 | * | |
3140 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3141 | */ | |
3142 | int cmd_snapshot_add_output(struct ltt_session *session, | |
3143 | struct lttng_snapshot_output *output, uint32_t *id) | |
3144 | { | |
3145 | int ret; | |
3146 | struct snapshot_output *new_output; | |
3147 | ||
3148 | assert(session); | |
3149 | assert(output); | |
3150 | ||
3151 | DBG("Cmd snapshot add output for session %s", session->name); | |
3152 | ||
3153 | /* | |
903ef685 | 3154 | * Can't create an output if the session is not set in no-output mode. |
6dc3064a DG |
3155 | */ |
3156 | if (session->output_traces) { | |
903ef685 | 3157 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3158 | goto error; |
3159 | } | |
3160 | ||
3161 | /* Only one output is allowed until we have the "tee" feature. */ | |
3162 | if (session->snapshot.nb_output == 1) { | |
3163 | ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST; | |
3164 | goto error; | |
3165 | } | |
3166 | ||
3167 | new_output = snapshot_output_alloc(); | |
3168 | if (!new_output) { | |
3169 | ret = LTTNG_ERR_NOMEM; | |
3170 | goto error; | |
3171 | } | |
3172 | ||
3173 | ret = snapshot_output_init(output->max_size, output->name, | |
3174 | output->ctrl_url, output->data_url, session->consumer, new_output, | |
3175 | &session->snapshot); | |
3176 | if (ret < 0) { | |
3177 | if (ret == -ENOMEM) { | |
3178 | ret = LTTNG_ERR_NOMEM; | |
3179 | } else { | |
3180 | ret = LTTNG_ERR_INVALID; | |
3181 | } | |
3182 | goto free_error; | |
3183 | } | |
3184 | ||
6dc3064a DG |
3185 | rcu_read_lock(); |
3186 | snapshot_add_output(&session->snapshot, new_output); | |
3187 | if (id) { | |
3188 | *id = new_output->id; | |
3189 | } | |
3190 | rcu_read_unlock(); | |
3191 | ||
3192 | return LTTNG_OK; | |
3193 | ||
3194 | free_error: | |
3195 | snapshot_output_destroy(new_output); | |
3196 | error: | |
3197 | return ret; | |
3198 | } | |
3199 | ||
3200 | /* | |
3201 | * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl. | |
3202 | * | |
3203 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3204 | */ | |
3205 | int cmd_snapshot_del_output(struct ltt_session *session, | |
3206 | struct lttng_snapshot_output *output) | |
3207 | { | |
3208 | int ret; | |
eb240553 | 3209 | struct snapshot_output *sout = NULL; |
6dc3064a DG |
3210 | |
3211 | assert(session); | |
3212 | assert(output); | |
3213 | ||
6dc3064a DG |
3214 | rcu_read_lock(); |
3215 | ||
3216 | /* | |
d3f14b8a MD |
3217 | * Permission denied to create an output if the session is not |
3218 | * set in no output mode. | |
6dc3064a DG |
3219 | */ |
3220 | if (session->output_traces) { | |
903ef685 | 3221 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3222 | goto error; |
3223 | } | |
3224 | ||
eb240553 DG |
3225 | if (output->id) { |
3226 | DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id, | |
3227 | session->name); | |
3228 | sout = snapshot_find_output_by_id(output->id, &session->snapshot); | |
3229 | } else if (*output->name != '\0') { | |
3230 | DBG("Cmd snapshot del output name %s for session %s", output->name, | |
3231 | session->name); | |
3232 | sout = snapshot_find_output_by_name(output->name, &session->snapshot); | |
3233 | } | |
6dc3064a DG |
3234 | if (!sout) { |
3235 | ret = LTTNG_ERR_INVALID; | |
3236 | goto error; | |
3237 | } | |
3238 | ||
3239 | snapshot_delete_output(&session->snapshot, sout); | |
3240 | snapshot_output_destroy(sout); | |
3241 | ret = LTTNG_OK; | |
3242 | ||
3243 | error: | |
3244 | rcu_read_unlock(); | |
3245 | return ret; | |
3246 | } | |
3247 | ||
3248 | /* | |
3249 | * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl. | |
3250 | * | |
3251 | * If no output is available, outputs is untouched and 0 is returned. | |
3252 | * | |
3253 | * Return the size of the newly allocated outputs or a negative LTTNG_ERR code. | |
3254 | */ | |
3255 | ssize_t cmd_snapshot_list_outputs(struct ltt_session *session, | |
3256 | struct lttng_snapshot_output **outputs) | |
3257 | { | |
3258 | int ret, idx = 0; | |
b223ca94 | 3259 | struct lttng_snapshot_output *list = NULL; |
6dc3064a DG |
3260 | struct lttng_ht_iter iter; |
3261 | struct snapshot_output *output; | |
3262 | ||
3263 | assert(session); | |
3264 | assert(outputs); | |
3265 | ||
3266 | DBG("Cmd snapshot list outputs for session %s", session->name); | |
3267 | ||
3268 | /* | |
d3f14b8a MD |
3269 | * Permission denied to create an output if the session is not |
3270 | * set in no output mode. | |
6dc3064a DG |
3271 | */ |
3272 | if (session->output_traces) { | |
903ef685 JG |
3273 | ret = -LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
3274 | goto end; | |
6dc3064a DG |
3275 | } |
3276 | ||
3277 | if (session->snapshot.nb_output == 0) { | |
3278 | ret = 0; | |
903ef685 | 3279 | goto end; |
6dc3064a DG |
3280 | } |
3281 | ||
3282 | list = zmalloc(session->snapshot.nb_output * sizeof(*list)); | |
3283 | if (!list) { | |
b223ca94 | 3284 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3285 | goto end; |
6dc3064a DG |
3286 | } |
3287 | ||
3288 | /* Copy list from session to the new list object. */ | |
b223ca94 | 3289 | rcu_read_lock(); |
6dc3064a DG |
3290 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter, |
3291 | output, node.node) { | |
3292 | assert(output->consumer); | |
3293 | list[idx].id = output->id; | |
3294 | list[idx].max_size = output->max_size; | |
6ce22875 MD |
3295 | if (lttng_strncpy(list[idx].name, output->name, |
3296 | sizeof(list[idx].name))) { | |
3297 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 3298 | goto error; |
6ce22875 | 3299 | } |
6dc3064a | 3300 | if (output->consumer->type == CONSUMER_DST_LOCAL) { |
6ce22875 MD |
3301 | if (lttng_strncpy(list[idx].ctrl_url, |
3302 | output->consumer->dst.trace_path, | |
3303 | sizeof(list[idx].ctrl_url))) { | |
3304 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 3305 | goto error; |
6ce22875 | 3306 | } |
6dc3064a DG |
3307 | } else { |
3308 | /* Control URI. */ | |
3309 | ret = uri_to_str_url(&output->consumer->dst.net.control, | |
3310 | list[idx].ctrl_url, sizeof(list[idx].ctrl_url)); | |
3311 | if (ret < 0) { | |
b223ca94 | 3312 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3313 | goto error; |
6dc3064a DG |
3314 | } |
3315 | ||
3316 | /* Data URI. */ | |
3317 | ret = uri_to_str_url(&output->consumer->dst.net.data, | |
3318 | list[idx].data_url, sizeof(list[idx].data_url)); | |
3319 | if (ret < 0) { | |
b223ca94 | 3320 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3321 | goto error; |
6dc3064a DG |
3322 | } |
3323 | } | |
3324 | idx++; | |
3325 | } | |
3326 | ||
3327 | *outputs = list; | |
b223ca94 JG |
3328 | list = NULL; |
3329 | ret = session->snapshot.nb_output; | |
6dc3064a | 3330 | error: |
903ef685 | 3331 | rcu_read_unlock(); |
b223ca94 | 3332 | free(list); |
903ef685 | 3333 | end: |
b223ca94 | 3334 | return ret; |
6dc3064a DG |
3335 | } |
3336 | ||
93ec662e JD |
3337 | /* |
3338 | * Check if we can regenerate the metadata for this session. | |
3339 | * Only kernel, UST per-uid and non-live sessions are supported. | |
3340 | * | |
3341 | * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise. | |
3342 | */ | |
3343 | static | |
eded6438 | 3344 | int check_regenerate_metadata_support(struct ltt_session *session) |
93ec662e JD |
3345 | { |
3346 | int ret; | |
3347 | ||
3348 | assert(session); | |
3349 | ||
3350 | if (session->live_timer != 0) { | |
3351 | ret = LTTNG_ERR_LIVE_SESSION; | |
3352 | goto end; | |
3353 | } | |
3354 | if (!session->active) { | |
3355 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
3356 | goto end; | |
3357 | } | |
3358 | if (session->ust_session) { | |
3359 | switch (session->ust_session->buffer_type) { | |
3360 | case LTTNG_BUFFER_PER_UID: | |
3361 | break; | |
3362 | case LTTNG_BUFFER_PER_PID: | |
3363 | ret = LTTNG_ERR_PER_PID_SESSION; | |
3364 | goto end; | |
3365 | default: | |
3366 | assert(0); | |
3367 | ret = LTTNG_ERR_UNK; | |
3368 | goto end; | |
3369 | } | |
3370 | } | |
3371 | if (session->consumer->type == CONSUMER_DST_NET && | |
3372 | session->consumer->relay_minor_version < 8) { | |
3373 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; | |
3374 | goto end; | |
3375 | } | |
3376 | ret = 0; | |
3377 | ||
3378 | end: | |
3379 | return ret; | |
3380 | } | |
3381 | ||
7802bae3 LL |
3382 | static |
3383 | int clear_metadata_file(int fd) | |
3384 | { | |
3385 | int ret; | |
3386 | ||
3387 | ret = lseek(fd, 0, SEEK_SET); | |
3388 | if (ret < 0) { | |
3389 | PERROR("lseek"); | |
3390 | goto end; | |
3391 | } | |
3392 | ||
3393 | ret = ftruncate(fd, 0); | |
3394 | if (ret < 0) { | |
3395 | PERROR("ftruncate"); | |
3396 | goto end; | |
3397 | } | |
3398 | ||
3399 | end: | |
3400 | return ret; | |
3401 | } | |
3402 | ||
93ec662e | 3403 | static |
eded6438 | 3404 | int ust_regenerate_metadata(struct ltt_ust_session *usess) |
93ec662e JD |
3405 | { |
3406 | int ret = 0; | |
3407 | struct buffer_reg_uid *uid_reg = NULL; | |
3408 | struct buffer_reg_session *session_reg = NULL; | |
3409 | ||
3410 | rcu_read_lock(); | |
3411 | cds_list_for_each_entry(uid_reg, &usess->buffer_reg_uid_list, lnode) { | |
3412 | struct ust_registry_session *registry; | |
3413 | struct ust_registry_channel *chan; | |
3414 | struct lttng_ht_iter iter_chan; | |
3415 | ||
3416 | session_reg = uid_reg->registry; | |
3417 | registry = session_reg->reg.ust; | |
3418 | ||
3419 | pthread_mutex_lock(®istry->lock); | |
3420 | registry->metadata_len_sent = 0; | |
3421 | memset(registry->metadata, 0, registry->metadata_alloc_len); | |
3422 | registry->metadata_len = 0; | |
3423 | registry->metadata_version++; | |
7802bae3 LL |
3424 | if (registry->metadata_fd > 0) { |
3425 | /* Clear the metadata file's content. */ | |
3426 | ret = clear_metadata_file(registry->metadata_fd); | |
3427 | if (ret) { | |
3428 | pthread_mutex_unlock(®istry->lock); | |
3429 | goto end; | |
3430 | } | |
3431 | } | |
3432 | ||
93ec662e JD |
3433 | ret = ust_metadata_session_statedump(registry, NULL, |
3434 | registry->major, registry->minor); | |
3435 | if (ret) { | |
3436 | pthread_mutex_unlock(®istry->lock); | |
3437 | ERR("Failed to generate session metadata (err = %d)", | |
3438 | ret); | |
3439 | goto end; | |
3440 | } | |
3441 | cds_lfht_for_each_entry(registry->channels->ht, &iter_chan.iter, | |
3442 | chan, node.node) { | |
3443 | struct ust_registry_event *event; | |
3444 | struct lttng_ht_iter iter_event; | |
3445 | ||
3446 | ret = ust_metadata_channel_statedump(registry, chan); | |
3447 | if (ret) { | |
3448 | pthread_mutex_unlock(®istry->lock); | |
3449 | ERR("Failed to generate channel metadata " | |
3450 | "(err = %d)", ret); | |
3451 | goto end; | |
3452 | } | |
3453 | cds_lfht_for_each_entry(chan->ht->ht, &iter_event.iter, | |
3454 | event, node.node) { | |
3455 | ret = ust_metadata_event_statedump(registry, | |
3456 | chan, event); | |
3457 | if (ret) { | |
3458 | pthread_mutex_unlock(®istry->lock); | |
3459 | ERR("Failed to generate event metadata " | |
3460 | "(err = %d)", ret); | |
3461 | goto end; | |
3462 | } | |
3463 | } | |
3464 | } | |
3465 | pthread_mutex_unlock(®istry->lock); | |
3466 | } | |
3467 | ||
3468 | end: | |
3469 | rcu_read_unlock(); | |
3470 | return ret; | |
3471 | } | |
3472 | ||
3473 | /* | |
eded6438 | 3474 | * Command LTTNG_REGENERATE_METADATA from the lttng-ctl library. |
93ec662e JD |
3475 | * |
3476 | * Ask the consumer to truncate the existing metadata file(s) and | |
3477 | * then regenerate the metadata. Live and per-pid sessions are not | |
3478 | * supported and return an error. | |
3479 | * | |
3480 | * Return 0 on success or else a LTTNG_ERR code. | |
3481 | */ | |
eded6438 | 3482 | int cmd_regenerate_metadata(struct ltt_session *session) |
93ec662e JD |
3483 | { |
3484 | int ret; | |
3485 | ||
3486 | assert(session); | |
3487 | ||
eded6438 | 3488 | ret = check_regenerate_metadata_support(session); |
93ec662e JD |
3489 | if (ret) { |
3490 | goto end; | |
3491 | } | |
3492 | ||
3493 | if (session->kernel_session) { | |
eded6438 | 3494 | ret = kernctl_session_regenerate_metadata( |
93ec662e JD |
3495 | session->kernel_session->fd); |
3496 | if (ret < 0) { | |
3497 | ERR("Failed to regenerate the kernel metadata"); | |
3498 | goto end; | |
3499 | } | |
3500 | } | |
3501 | ||
3502 | if (session->ust_session) { | |
eded6438 | 3503 | ret = ust_regenerate_metadata(session->ust_session); |
93ec662e JD |
3504 | if (ret < 0) { |
3505 | ERR("Failed to regenerate the UST metadata"); | |
3506 | goto end; | |
3507 | } | |
3508 | } | |
3509 | DBG("Cmd metadata regenerate for session %s", session->name); | |
3510 | ret = LTTNG_OK; | |
3511 | ||
3512 | end: | |
3513 | return ret; | |
3514 | } | |
3515 | ||
c2561365 JD |
3516 | /* |
3517 | * Command LTTNG_REGENERATE_STATEDUMP from the lttng-ctl library. | |
3518 | * | |
3519 | * Ask the tracer to regenerate a new statedump. | |
3520 | * | |
3521 | * Return 0 on success or else a LTTNG_ERR code. | |
3522 | */ | |
3523 | int cmd_regenerate_statedump(struct ltt_session *session) | |
3524 | { | |
3525 | int ret; | |
3526 | ||
3527 | assert(session); | |
3528 | ||
3529 | if (!session->active) { | |
3530 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
3531 | goto end; | |
3532 | } | |
3533 | ret = 0; | |
3534 | ||
3535 | if (session->kernel_session) { | |
3536 | ret = kernctl_session_regenerate_statedump( | |
3537 | session->kernel_session->fd); | |
3538 | /* | |
3539 | * Currently, the statedump in kernel can only fail if out | |
3540 | * of memory. | |
3541 | */ | |
3542 | if (ret < 0) { | |
3543 | if (ret == -ENOMEM) { | |
3544 | ret = LTTNG_ERR_REGEN_STATEDUMP_NOMEM; | |
3545 | } else { | |
3546 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
3547 | } | |
3548 | ERR("Failed to regenerate the kernel statedump"); | |
3549 | goto end; | |
3550 | } | |
3551 | } | |
3552 | ||
3553 | if (session->ust_session) { | |
3554 | ret = ust_app_regenerate_statedump_all(session->ust_session); | |
3555 | /* | |
3556 | * Currently, the statedump in UST always returns 0. | |
3557 | */ | |
3558 | if (ret < 0) { | |
3559 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
3560 | ERR("Failed to regenerate the UST statedump"); | |
3561 | goto end; | |
3562 | } | |
3563 | } | |
3564 | DBG("Cmd regenerate statedump for session %s", session->name); | |
3565 | ret = LTTNG_OK; | |
3566 | ||
3567 | end: | |
3568 | return ret; | |
3569 | } | |
3570 | ||
c254fb11 JG |
3571 | int cmd_register_trigger(struct command_ctx *cmd_ctx, int sock, |
3572 | struct notification_thread_data *notification_thread) | |
db671df9 JG |
3573 | { |
3574 | int ret; | |
3575 | size_t trigger_len; | |
3576 | ssize_t sock_recv_len; | |
3577 | char *trigger_buffer = NULL; | |
3578 | struct lttng_trigger *trigger = NULL; | |
c254fb11 | 3579 | uint64_t notification_counter = 1; |
db671df9 | 3580 | |
616ad1e2 | 3581 | trigger_len = (size_t) cmd_ctx->lsm->u.trigger.length; |
db671df9 JG |
3582 | trigger_buffer = zmalloc(trigger_len); |
3583 | if (!trigger_buffer) { | |
3584 | ret = LTTNG_ERR_NOMEM; | |
3585 | goto end; | |
3586 | } | |
3587 | ||
3588 | sock_recv_len = lttcomm_recv_unix_sock(sock, trigger_buffer, | |
3589 | trigger_len); | |
3590 | if (sock_recv_len < 0 || sock_recv_len != trigger_len) { | |
3591 | ERR("Failed to receive \"register trigger\" command payload"); | |
3592 | goto end; | |
3593 | } | |
3594 | ||
3595 | if (lttng_trigger_create_from_buffer(trigger_buffer, &trigger) != | |
3596 | trigger_len) { | |
3597 | ERR("Invalid trigger payload received in \"register trigger\" command"); | |
3598 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
3599 | goto end; | |
3600 | } | |
c254fb11 JG |
3601 | |
3602 | /* Enqueue and signal. */ | |
3603 | pthread_mutex_lock(¬ification_thread->cmd_queue.lock); | |
3604 | cds_list_add(&trigger->list_node, ¬ification_thread->cmd_queue.list); | |
3605 | trigger = NULL; | |
3606 | pthread_mutex_unlock(¬ification_thread->cmd_queue.lock); | |
3607 | ret = write(notification_thread->cmd_queue.event_fd, | |
3608 | ¬ification_counter, sizeof(notification_counter)); | |
3609 | if (ret < 0) { | |
3610 | PERROR("write to notification thread's queue event fd"); | |
3611 | } else { | |
3612 | ret = LTTNG_OK; | |
3613 | } | |
db671df9 | 3614 | DBG("Command register trigger succeeded"); |
db671df9 JG |
3615 | end: |
3616 | free(trigger_buffer); | |
db671df9 JG |
3617 | return ret; |
3618 | } | |
3619 | ||
6dc3064a DG |
3620 | /* |
3621 | * Send relayd sockets from snapshot output to consumer. Ignore request if the | |
3622 | * snapshot output is *not* set with a remote destination. | |
3623 | * | |
a934f4af | 3624 | * Return 0 on success or a LTTNG_ERR code. |
6dc3064a DG |
3625 | */ |
3626 | static int set_relayd_for_snapshot(struct consumer_output *consumer, | |
3627 | struct snapshot_output *snap_output, struct ltt_session *session) | |
3628 | { | |
a934f4af | 3629 | int ret = LTTNG_OK; |
6dc3064a DG |
3630 | struct lttng_ht_iter iter; |
3631 | struct consumer_socket *socket; | |
3632 | ||
3633 | assert(consumer); | |
3634 | assert(snap_output); | |
3635 | assert(session); | |
3636 | ||
3637 | DBG2("Set relayd object from snapshot output"); | |
3638 | ||
3639 | /* Ignore if snapshot consumer output is not network. */ | |
3640 | if (snap_output->consumer->type != CONSUMER_DST_NET) { | |
3641 | goto error; | |
3642 | } | |
3643 | ||
3644 | /* | |
3645 | * For each consumer socket, create and send the relayd object of the | |
3646 | * snapshot output. | |
3647 | */ | |
3648 | rcu_read_lock(); | |
5eecee74 DG |
3649 | cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter, |
3650 | socket, node.node) { | |
6dc3064a | 3651 | ret = send_consumer_relayd_sockets(0, session->id, |
d3e2ba59 JD |
3652 | snap_output->consumer, socket, |
3653 | session->name, session->hostname, | |
3654 | session->live_timer); | |
a934f4af | 3655 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3656 | rcu_read_unlock(); |
3657 | goto error; | |
3658 | } | |
3659 | } | |
3660 | rcu_read_unlock(); | |
3661 | ||
3662 | error: | |
3663 | return ret; | |
3664 | } | |
3665 | ||
3666 | /* | |
3667 | * Record a kernel snapshot. | |
3668 | * | |
fac41e72 | 3669 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a DG |
3670 | */ |
3671 | static int record_kernel_snapshot(struct ltt_kernel_session *ksess, | |
5c786ded | 3672 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3673 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3674 | { |
3675 | int ret; | |
3676 | ||
3677 | assert(ksess); | |
3678 | assert(output); | |
3679 | assert(session); | |
3680 | ||
10a50311 | 3681 | |
af706bb7 DG |
3682 | /* |
3683 | * Copy kernel session sockets so we can communicate with the right | |
3684 | * consumer for the snapshot record command. | |
3685 | */ | |
3686 | ret = consumer_copy_sockets(output->consumer, ksess->consumer); | |
3687 | if (ret < 0) { | |
a934f4af | 3688 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3689 | goto error; |
6dc3064a DG |
3690 | } |
3691 | ||
3692 | ret = set_relayd_for_snapshot(ksess->consumer, output, session); | |
a934f4af | 3693 | if (ret != LTTNG_OK) { |
af706bb7 | 3694 | goto error_snapshot; |
6dc3064a DG |
3695 | } |
3696 | ||
d07ceecd | 3697 | ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream); |
2a06df8d | 3698 | if (ret != LTTNG_OK) { |
af706bb7 | 3699 | goto error_snapshot; |
6dc3064a DG |
3700 | } |
3701 | ||
a934f4af | 3702 | ret = LTTNG_OK; |
1371fc12 | 3703 | goto end; |
a934f4af | 3704 | |
af706bb7 DG |
3705 | error_snapshot: |
3706 | /* Clean up copied sockets so this output can use some other later on. */ | |
3707 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a | 3708 | error: |
1371fc12 | 3709 | end: |
6dc3064a DG |
3710 | return ret; |
3711 | } | |
3712 | ||
3713 | /* | |
3714 | * Record a UST snapshot. | |
3715 | * | |
a934f4af | 3716 | * Return 0 on success or a LTTNG_ERR error code. |
6dc3064a DG |
3717 | */ |
3718 | static int record_ust_snapshot(struct ltt_ust_session *usess, | |
5c786ded | 3719 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3720 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3721 | { |
3722 | int ret; | |
3723 | ||
3724 | assert(usess); | |
3725 | assert(output); | |
3726 | assert(session); | |
3727 | ||
af706bb7 | 3728 | /* |
d3f14b8a | 3729 | * Copy UST session sockets so we can communicate with the right |
af706bb7 DG |
3730 | * consumer for the snapshot record command. |
3731 | */ | |
3732 | ret = consumer_copy_sockets(output->consumer, usess->consumer); | |
3733 | if (ret < 0) { | |
a934f4af | 3734 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3735 | goto error; |
6dc3064a DG |
3736 | } |
3737 | ||
3738 | ret = set_relayd_for_snapshot(usess->consumer, output, session); | |
a934f4af | 3739 | if (ret != LTTNG_OK) { |
af706bb7 | 3740 | goto error_snapshot; |
6dc3064a DG |
3741 | } |
3742 | ||
d07ceecd | 3743 | ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream); |
6dc3064a | 3744 | if (ret < 0) { |
7badf927 DG |
3745 | switch (-ret) { |
3746 | case EINVAL: | |
a934f4af | 3747 | ret = LTTNG_ERR_INVALID; |
7badf927 | 3748 | break; |
7badf927 DG |
3749 | default: |
3750 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
3751 | break; | |
5c786ded | 3752 | } |
af706bb7 | 3753 | goto error_snapshot; |
6dc3064a DG |
3754 | } |
3755 | ||
a934f4af DG |
3756 | ret = LTTNG_OK; |
3757 | ||
af706bb7 DG |
3758 | error_snapshot: |
3759 | /* Clean up copied sockets so this output can use some other later on. */ | |
3760 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a DG |
3761 | error: |
3762 | return ret; | |
3763 | } | |
3764 | ||
d07ceecd MD |
3765 | static |
3766 | uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session, | |
3767 | uint64_t cur_nr_packets) | |
68808f4e | 3768 | { |
d07ceecd | 3769 | uint64_t tot_size = 0; |
68808f4e DG |
3770 | |
3771 | if (session->kernel_session) { | |
3772 | struct ltt_kernel_channel *chan; | |
3773 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3774 | ||
68808f4e | 3775 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
d07ceecd MD |
3776 | if (cur_nr_packets >= chan->channel->attr.num_subbuf) { |
3777 | /* | |
3778 | * Don't take channel into account if we | |
3779 | * already grab all its packets. | |
3780 | */ | |
3781 | continue; | |
68808f4e | 3782 | } |
d07ceecd MD |
3783 | tot_size += chan->channel->attr.subbuf_size |
3784 | * chan->stream_count; | |
68808f4e DG |
3785 | } |
3786 | } | |
3787 | ||
3788 | if (session->ust_session) { | |
68808f4e DG |
3789 | struct ltt_ust_session *usess = session->ust_session; |
3790 | ||
d07ceecd MD |
3791 | tot_size += ust_app_get_size_one_more_packet_per_stream(usess, |
3792 | cur_nr_packets); | |
68808f4e DG |
3793 | } |
3794 | ||
d07ceecd | 3795 | return tot_size; |
68808f4e DG |
3796 | } |
3797 | ||
5c786ded | 3798 | /* |
d07ceecd MD |
3799 | * Calculate the number of packets we can grab from each stream that |
3800 | * fits within the overall snapshot max size. | |
3801 | * | |
3802 | * Returns -1 on error, 0 means infinite number of packets, else > 0 is | |
3803 | * the number of packets per stream. | |
3804 | * | |
3805 | * TODO: this approach is not perfect: we consider the worse case | |
3806 | * (packet filling the sub-buffers) as an upper bound, but we could do | |
3807 | * better if we do this calculation while we actually grab the packet | |
3808 | * content: we would know how much padding we don't actually store into | |
3809 | * the file. | |
3810 | * | |
3811 | * This algorithm is currently bounded by the number of packets per | |
3812 | * stream. | |
3813 | * | |
3814 | * Since we call this algorithm before actually grabbing the data, it's | |
3815 | * an approximation: for instance, applications could appear/disappear | |
3816 | * in between this call and actually grabbing data. | |
5c786ded | 3817 | */ |
d07ceecd MD |
3818 | static |
3819 | int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size) | |
5c786ded | 3820 | { |
d07ceecd MD |
3821 | int64_t size_left; |
3822 | uint64_t cur_nb_packets = 0; | |
5c786ded | 3823 | |
d07ceecd MD |
3824 | if (!max_size) { |
3825 | return 0; /* Infinite */ | |
5c786ded JD |
3826 | } |
3827 | ||
d07ceecd MD |
3828 | size_left = max_size; |
3829 | for (;;) { | |
3830 | uint64_t one_more_packet_tot_size; | |
5c786ded | 3831 | |
d07ceecd MD |
3832 | one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session, |
3833 | cur_nb_packets); | |
3834 | if (!one_more_packet_tot_size) { | |
3835 | /* We are already grabbing all packets. */ | |
3836 | break; | |
3837 | } | |
3838 | size_left -= one_more_packet_tot_size; | |
3839 | if (size_left < 0) { | |
3840 | break; | |
3841 | } | |
3842 | cur_nb_packets++; | |
5c786ded | 3843 | } |
d07ceecd MD |
3844 | if (!cur_nb_packets) { |
3845 | /* Not enough room to grab one packet of each stream, error. */ | |
3846 | return -1; | |
3847 | } | |
3848 | return cur_nb_packets; | |
5c786ded JD |
3849 | } |
3850 | ||
6dc3064a DG |
3851 | /* |
3852 | * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl. | |
3853 | * | |
3854 | * The wait parameter is ignored so this call always wait for the snapshot to | |
3855 | * complete before returning. | |
3856 | * | |
3857 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3858 | */ | |
3859 | int cmd_snapshot_record(struct ltt_session *session, | |
3860 | struct lttng_snapshot_output *output, int wait) | |
3861 | { | |
3862 | int ret = LTTNG_OK; | |
e1986656 DG |
3863 | unsigned int use_tmp_output = 0; |
3864 | struct snapshot_output tmp_output; | |
00e1dfc4 | 3865 | unsigned int snapshot_success = 0; |
10ba83fe | 3866 | char datetime[16]; |
6dc3064a DG |
3867 | |
3868 | assert(session); | |
ba45d9f0 | 3869 | assert(output); |
6dc3064a DG |
3870 | |
3871 | DBG("Cmd snapshot record for session %s", session->name); | |
3872 | ||
10ba83fe JR |
3873 | /* Get the datetime for the snapshot output directory. */ |
3874 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", datetime, | |
3875 | sizeof(datetime)); | |
3876 | if (!ret) { | |
3877 | ret = LTTNG_ERR_INVALID; | |
3878 | goto error; | |
3879 | } | |
3880 | ||
6dc3064a | 3881 | /* |
d3f14b8a MD |
3882 | * Permission denied to create an output if the session is not |
3883 | * set in no output mode. | |
6dc3064a DG |
3884 | */ |
3885 | if (session->output_traces) { | |
903ef685 | 3886 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3887 | goto error; |
3888 | } | |
3889 | ||
3890 | /* The session needs to be started at least once. */ | |
8382cf6f | 3891 | if (!session->has_been_started) { |
6dc3064a DG |
3892 | ret = LTTNG_ERR_START_SESSION_ONCE; |
3893 | goto error; | |
3894 | } | |
3895 | ||
3896 | /* Use temporary output for the session. */ | |
ba45d9f0 | 3897 | if (*output->ctrl_url != '\0') { |
6dc3064a DG |
3898 | ret = snapshot_output_init(output->max_size, output->name, |
3899 | output->ctrl_url, output->data_url, session->consumer, | |
e1986656 | 3900 | &tmp_output, NULL); |
6dc3064a DG |
3901 | if (ret < 0) { |
3902 | if (ret == -ENOMEM) { | |
3903 | ret = LTTNG_ERR_NOMEM; | |
3904 | } else { | |
3905 | ret = LTTNG_ERR_INVALID; | |
3906 | } | |
3907 | goto error; | |
3908 | } | |
1bfe7328 DG |
3909 | /* Use the global session count for the temporary snapshot. */ |
3910 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; | |
10ba83fe JR |
3911 | |
3912 | /* Use the global datetime */ | |
3913 | memcpy(tmp_output.datetime, datetime, sizeof(datetime)); | |
e1986656 | 3914 | use_tmp_output = 1; |
6dc3064a DG |
3915 | } |
3916 | ||
804c90a8 JR |
3917 | if (use_tmp_output) { |
3918 | int64_t nb_packets_per_stream; | |
6dc3064a | 3919 | |
804c90a8 JR |
3920 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, |
3921 | tmp_output.max_size); | |
3922 | if (nb_packets_per_stream < 0) { | |
3923 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
3924 | goto error; | |
3925 | } | |
d07ceecd | 3926 | |
804c90a8 JR |
3927 | if (session->kernel_session) { |
3928 | ret = record_kernel_snapshot(session->kernel_session, | |
3929 | &tmp_output, session, | |
3930 | wait, nb_packets_per_stream); | |
3931 | if (ret != LTTNG_OK) { | |
d07ceecd MD |
3932 | goto error; |
3933 | } | |
804c90a8 JR |
3934 | } |
3935 | ||
3936 | if (session->ust_session) { | |
3937 | ret = record_ust_snapshot(session->ust_session, | |
3938 | &tmp_output, session, | |
d07ceecd | 3939 | wait, nb_packets_per_stream); |
a934f4af | 3940 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3941 | goto error; |
3942 | } | |
804c90a8 | 3943 | } |
e1986656 | 3944 | |
804c90a8 JR |
3945 | snapshot_success = 1; |
3946 | } else { | |
3947 | struct snapshot_output *sout; | |
3948 | struct lttng_ht_iter iter; | |
68808f4e | 3949 | |
804c90a8 JR |
3950 | rcu_read_lock(); |
3951 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
3952 | &iter.iter, sout, node.node) { | |
3953 | int64_t nb_packets_per_stream; | |
e1986656 | 3954 | |
804c90a8 JR |
3955 | /* |
3956 | * Make a local copy of the output and assign the possible | |
3957 | * temporary value given by the caller. | |
3958 | */ | |
3959 | memset(&tmp_output, 0, sizeof(tmp_output)); | |
3960 | memcpy(&tmp_output, sout, sizeof(tmp_output)); | |
1bfe7328 | 3961 | |
804c90a8 JR |
3962 | if (output->max_size != (uint64_t) -1ULL) { |
3963 | tmp_output.max_size = output->max_size; | |
6dc3064a | 3964 | } |
d07ceecd MD |
3965 | |
3966 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
3967 | tmp_output.max_size); | |
3968 | if (nb_packets_per_stream < 0) { | |
3969 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
804c90a8 | 3970 | rcu_read_unlock(); |
d07ceecd MD |
3971 | goto error; |
3972 | } | |
6dc3064a | 3973 | |
804c90a8 JR |
3974 | /* Use temporary name. */ |
3975 | if (*output->name != '\0') { | |
cf3e357d MD |
3976 | if (lttng_strncpy(tmp_output.name, output->name, |
3977 | sizeof(tmp_output.name))) { | |
3978 | ret = LTTNG_ERR_INVALID; | |
3979 | rcu_read_unlock(); | |
3980 | goto error; | |
3981 | } | |
804c90a8 | 3982 | } |
e1986656 | 3983 | |
804c90a8 | 3984 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; |
10ba83fe | 3985 | memcpy(tmp_output.datetime, datetime, sizeof(datetime)); |
e1986656 | 3986 | |
804c90a8 JR |
3987 | if (session->kernel_session) { |
3988 | ret = record_kernel_snapshot(session->kernel_session, | |
3989 | &tmp_output, session, | |
3990 | wait, nb_packets_per_stream); | |
3991 | if (ret != LTTNG_OK) { | |
d07ceecd | 3992 | rcu_read_unlock(); |
68808f4e DG |
3993 | goto error; |
3994 | } | |
804c90a8 | 3995 | } |
68808f4e | 3996 | |
804c90a8 JR |
3997 | if (session->ust_session) { |
3998 | ret = record_ust_snapshot(session->ust_session, | |
3999 | &tmp_output, session, | |
d07ceecd | 4000 | wait, nb_packets_per_stream); |
a934f4af | 4001 | if (ret != LTTNG_OK) { |
6dc3064a DG |
4002 | rcu_read_unlock(); |
4003 | goto error; | |
4004 | } | |
4005 | } | |
804c90a8 | 4006 | snapshot_success = 1; |
6dc3064a | 4007 | } |
804c90a8 | 4008 | rcu_read_unlock(); |
6dc3064a DG |
4009 | } |
4010 | ||
1bfe7328 DG |
4011 | if (snapshot_success) { |
4012 | session->snapshot.nb_snapshot++; | |
b67578cb MD |
4013 | } else { |
4014 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
1bfe7328 DG |
4015 | } |
4016 | ||
6dc3064a | 4017 | error: |
6dc3064a DG |
4018 | return ret; |
4019 | } | |
4020 | ||
d7ba1388 MD |
4021 | /* |
4022 | * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread. | |
4023 | */ | |
4024 | int cmd_set_session_shm_path(struct ltt_session *session, | |
4025 | const char *shm_path) | |
4026 | { | |
4027 | /* Safety net */ | |
4028 | assert(session); | |
4029 | ||
4030 | /* | |
4031 | * Can only set shm path before session is started. | |
4032 | */ | |
4033 | if (session->has_been_started) { | |
4034 | return LTTNG_ERR_SESSION_STARTED; | |
4035 | } | |
4036 | ||
4037 | strncpy(session->shm_path, shm_path, | |
4038 | sizeof(session->shm_path)); | |
4039 | session->shm_path[sizeof(session->shm_path) - 1] = '\0'; | |
4040 | ||
4041 | return 0; | |
4042 | } | |
4043 | ||
2f77fc4b DG |
4044 | /* |
4045 | * Init command subsystem. | |
4046 | */ | |
4047 | void cmd_init(void) | |
4048 | { | |
4049 | /* | |
d88aee68 DG |
4050 | * Set network sequence index to 1 for streams to match a relayd |
4051 | * socket on the consumer side. | |
2f77fc4b | 4052 | */ |
d88aee68 DG |
4053 | pthread_mutex_lock(&relayd_net_seq_idx_lock); |
4054 | relayd_net_seq_idx = 1; | |
4055 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
4056 | |
4057 | DBG("Command subsystem initialized"); | |
4058 | } |