Commit | Line | Data |
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2f77fc4b | 1 | /* |
ab5be9fa MJ |
2 | * Copyright (C) 2012 David Goulet <dgoulet@efficios.com> |
3 | * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
2f77fc4b | 4 | * |
ab5be9fa | 5 | * SPDX-License-Identifier: GPL-2.0-only |
2f77fc4b | 6 | * |
2f77fc4b DG |
7 | */ |
8 | ||
588c4b0d | 9 | |
6c1c0768 | 10 | #define _LGPL_SOURCE |
7966af57 | 11 | #include <algorithm> |
6dc3064a | 12 | #include <inttypes.h> |
588c4b0d JG |
13 | #include <stdio.h> |
14 | #include <sys/stat.h> | |
2f77fc4b DG |
15 | #include <urcu/list.h> |
16 | #include <urcu/uatomic.h> | |
17 | ||
c9e313bc SM |
18 | #include <common/buffer-view.hpp> |
19 | #include <common/common.hpp> | |
20 | #include <common/compat/string.hpp> | |
21 | #include <common/defaults.hpp> | |
22 | #include <common/dynamic-buffer.hpp> | |
23 | #include <common/kernel-ctl/kernel-ctl.hpp> | |
24 | #include <common/payload-view.hpp> | |
25 | #include <common/payload.hpp> | |
26 | #include <common/relayd/relayd.hpp> | |
27 | #include <common/sessiond-comm/sessiond-comm.hpp> | |
28 | #include <common/string-utils/string-utils.hpp> | |
29 | #include <common/trace-chunk.hpp> | |
30 | #include <common/utils.hpp> | |
31 | #include <lttng/action/action-internal.hpp> | |
588c4b0d | 32 | #include <lttng/action/action.h> |
c9e313bc | 33 | #include <lttng/channel-internal.hpp> |
588c4b0d | 34 | #include <lttng/channel.h> |
c9e313bc | 35 | #include <lttng/condition/condition-internal.hpp> |
588c4b0d | 36 | #include <lttng/condition/condition.h> |
c9e313bc SM |
37 | #include <lttng/condition/event-rule-matches-internal.hpp> |
38 | #include <lttng/condition/event-rule-matches.h> | |
39 | #include <lttng/error-query-internal.hpp> | |
40 | #include <lttng/event-internal.hpp> | |
41 | #include <lttng/event-rule/event-rule-internal.hpp> | |
42 | #include <lttng/event-rule/event-rule.h> | |
43 | #include <lttng/location-internal.hpp> | |
44 | #include <lttng/lttng-error.h> | |
45 | #include <lttng/rotate-internal.hpp> | |
46 | #include <lttng/session-descriptor-internal.hpp> | |
47 | #include <lttng/session-internal.hpp> | |
48 | #include <lttng/tracker.h> | |
49 | #include <lttng/trigger/trigger-internal.hpp> | |
50 | #include <lttng/userspace-probe-internal.hpp> | |
2f77fc4b | 51 | |
c9e313bc SM |
52 | #include "agent-thread.hpp" |
53 | #include "agent.hpp" | |
54 | #include "buffer-registry.hpp" | |
55 | #include "channel.hpp" | |
56 | #include "cmd.hpp" | |
57 | #include "consumer.hpp" | |
58 | #include "event-notifier-error-accounting.hpp" | |
59 | #include "event.hpp" | |
60 | #include "health-sessiond.hpp" | |
61 | #include "kernel-consumer.hpp" | |
62 | #include "kernel.hpp" | |
63 | #include "lttng-sessiond.hpp" | |
64 | #include "lttng-syscall.hpp" | |
65 | #include "notification-thread-commands.hpp" | |
66 | #include "notification-thread.hpp" | |
67 | #include "rotate.hpp" | |
68 | #include "rotation-thread.hpp" | |
69 | #include "session.hpp" | |
70 | #include "timer.hpp" | |
71 | #include "tracker.hpp" | |
72 | #include "utils.hpp" | |
2f77fc4b | 73 | |
a503e1ef JG |
74 | /* Sleep for 100ms between each check for the shm path's deletion. */ |
75 | #define SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US 100000 | |
76 | ||
d7bfb9b0 JG |
77 | namespace lsu = lttng::sessiond::ust; |
78 | ||
f1494934 JG |
79 | static enum lttng_error_code wait_on_path(void *path); |
80 | ||
81 | namespace { | |
3e3665b8 JG |
82 | struct cmd_destroy_session_reply_context { |
83 | int reply_sock_fd; | |
84 | bool implicit_rotation_on_destroy; | |
3285a971 JG |
85 | /* |
86 | * Indicates whether or not an error occurred while launching the | |
87 | * destruction of a session. | |
88 | */ | |
89 | enum lttng_error_code destruction_status; | |
3e3665b8 JG |
90 | }; |
91 | ||
a503e1ef JG |
92 | /* |
93 | * Command completion handler that is used by the destroy command | |
94 | * when a session that has a non-default shm_path is being destroyed. | |
95 | * | |
96 | * See comment in cmd_destroy_session() for the rationale. | |
97 | */ | |
f1494934 | 98 | struct destroy_completion_handler { |
a503e1ef JG |
99 | struct cmd_completion_handler handler; |
100 | char shm_path[member_sizeof(struct ltt_session, shm_path)]; | |
101 | } destroy_completion_handler = { | |
102 | .handler = { | |
103 | .run = wait_on_path, | |
104 | .data = destroy_completion_handler.shm_path | |
105 | }, | |
106 | .shm_path = { 0 }, | |
107 | }; | |
108 | ||
2f77fc4b DG |
109 | /* |
110 | * Used to keep a unique index for each relayd socket created where this value | |
111 | * is associated with streams on the consumer so it can match the right relayd | |
d88aee68 DG |
112 | * to send to. It must be accessed with the relayd_net_seq_idx_lock |
113 | * held. | |
2f77fc4b | 114 | */ |
f1494934 JG |
115 | pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER; |
116 | uint64_t relayd_net_seq_idx; | |
117 | } /* namespace */ | |
2f77fc4b | 118 | |
f1494934 | 119 | static struct cmd_completion_handler *current_completion_handler; |
7076b56e JG |
120 | static int validate_ust_event_name(const char *); |
121 | static int cmd_enable_event_internal(struct ltt_session *session, | |
df4f5a87 | 122 | const struct lttng_domain *domain, |
7076b56e JG |
123 | char *channel_name, struct lttng_event *event, |
124 | char *filter_expression, | |
2b00d462 | 125 | struct lttng_bytecode *filter, |
7076b56e JG |
126 | struct lttng_event_exclusion *exclusion, |
127 | int wpipe); | |
4878de5c JG |
128 | static enum lttng_error_code cmd_enable_channel_internal( |
129 | struct ltt_session *session, | |
999af9c1 JR |
130 | const struct lttng_domain *domain, |
131 | const struct lttng_channel *_attr, | |
132 | int wpipe); | |
7076b56e | 133 | |
2f77fc4b DG |
134 | /* |
135 | * Create a session path used by list_lttng_sessions for the case that the | |
136 | * session consumer is on the network. | |
137 | */ | |
138 | static int build_network_session_path(char *dst, size_t size, | |
139 | struct ltt_session *session) | |
140 | { | |
141 | int ret, kdata_port, udata_port; | |
142 | struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL; | |
143 | char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX]; | |
144 | ||
a0377dfe FD |
145 | LTTNG_ASSERT(session); |
146 | LTTNG_ASSERT(dst); | |
2f77fc4b DG |
147 | |
148 | memset(tmp_urls, 0, sizeof(tmp_urls)); | |
149 | memset(tmp_uurl, 0, sizeof(tmp_uurl)); | |
150 | ||
151 | kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT; | |
152 | ||
153 | if (session->kernel_session && session->kernel_session->consumer) { | |
154 | kuri = &session->kernel_session->consumer->dst.net.control; | |
155 | kdata_port = session->kernel_session->consumer->dst.net.data.port; | |
156 | } | |
157 | ||
158 | if (session->ust_session && session->ust_session->consumer) { | |
159 | uuri = &session->ust_session->consumer->dst.net.control; | |
160 | udata_port = session->ust_session->consumer->dst.net.data.port; | |
161 | } | |
162 | ||
163 | if (uuri == NULL && kuri == NULL) { | |
164 | uri = &session->consumer->dst.net.control; | |
165 | kdata_port = session->consumer->dst.net.data.port; | |
166 | } else if (kuri && uuri) { | |
167 | ret = uri_compare(kuri, uuri); | |
168 | if (ret) { | |
169 | /* Not Equal */ | |
170 | uri = kuri; | |
171 | /* Build uuri URL string */ | |
172 | ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl)); | |
173 | if (ret < 0) { | |
174 | goto error; | |
175 | } | |
176 | } else { | |
177 | uri = kuri; | |
178 | } | |
179 | } else if (kuri && uuri == NULL) { | |
180 | uri = kuri; | |
181 | } else if (uuri && kuri == NULL) { | |
182 | uri = uuri; | |
183 | } | |
184 | ||
185 | ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls)); | |
186 | if (ret < 0) { | |
187 | goto error; | |
188 | } | |
189 | ||
9aa9f900 DG |
190 | /* |
191 | * Do we have a UST url set. If yes, this means we have both kernel and UST | |
192 | * to print. | |
193 | */ | |
9d035200 | 194 | if (*tmp_uurl != '\0') { |
2f77fc4b DG |
195 | ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]", |
196 | tmp_urls, kdata_port, tmp_uurl, udata_port); | |
197 | } else { | |
9aa9f900 | 198 | int dport; |
bef08707 | 199 | if (kuri || (!kuri && !uuri)) { |
9aa9f900 DG |
200 | dport = kdata_port; |
201 | } else { | |
202 | /* No kernel URI, use the UST port. */ | |
203 | dport = udata_port; | |
204 | } | |
205 | ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport); | |
2f77fc4b DG |
206 | } |
207 | ||
208 | error: | |
209 | return ret; | |
210 | } | |
211 | ||
fb83fe64 JD |
212 | /* |
213 | * Get run-time attributes if the session has been started (discarded events, | |
214 | * lost packets). | |
215 | */ | |
216 | static int get_kernel_runtime_stats(struct ltt_session *session, | |
217 | struct ltt_kernel_channel *kchan, uint64_t *discarded_events, | |
218 | uint64_t *lost_packets) | |
219 | { | |
220 | int ret; | |
221 | ||
222 | if (!session->has_been_started) { | |
223 | ret = 0; | |
224 | *discarded_events = 0; | |
225 | *lost_packets = 0; | |
226 | goto end; | |
227 | } | |
228 | ||
e1f3997a | 229 | ret = consumer_get_discarded_events(session->id, kchan->key, |
fb83fe64 JD |
230 | session->kernel_session->consumer, |
231 | discarded_events); | |
232 | if (ret < 0) { | |
233 | goto end; | |
234 | } | |
235 | ||
e1f3997a | 236 | ret = consumer_get_lost_packets(session->id, kchan->key, |
fb83fe64 JD |
237 | session->kernel_session->consumer, |
238 | lost_packets); | |
239 | if (ret < 0) { | |
240 | goto end; | |
241 | } | |
242 | ||
243 | end: | |
244 | return ret; | |
245 | } | |
246 | ||
247 | /* | |
248 | * Get run-time attributes if the session has been started (discarded events, | |
249 | * lost packets). | |
250 | */ | |
251 | static int get_ust_runtime_stats(struct ltt_session *session, | |
252 | struct ltt_ust_channel *uchan, uint64_t *discarded_events, | |
253 | uint64_t *lost_packets) | |
254 | { | |
255 | int ret; | |
256 | struct ltt_ust_session *usess; | |
257 | ||
a91c5803 JG |
258 | if (!discarded_events || !lost_packets) { |
259 | ret = -1; | |
260 | goto end; | |
261 | } | |
262 | ||
fb83fe64 | 263 | usess = session->ust_session; |
a0377dfe FD |
264 | LTTNG_ASSERT(discarded_events); |
265 | LTTNG_ASSERT(lost_packets); | |
fb83fe64 JD |
266 | |
267 | if (!usess || !session->has_been_started) { | |
268 | *discarded_events = 0; | |
269 | *lost_packets = 0; | |
270 | ret = 0; | |
271 | goto end; | |
272 | } | |
273 | ||
274 | if (usess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
275 | ret = ust_app_uid_get_channel_runtime_stats(usess->id, | |
276 | &usess->buffer_reg_uid_list, | |
277 | usess->consumer, uchan->id, | |
278 | uchan->attr.overwrite, | |
279 | discarded_events, | |
280 | lost_packets); | |
281 | } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
282 | ret = ust_app_pid_get_channel_runtime_stats(usess, | |
283 | uchan, usess->consumer, | |
284 | uchan->attr.overwrite, | |
285 | discarded_events, | |
286 | lost_packets); | |
287 | if (ret < 0) { | |
288 | goto end; | |
289 | } | |
290 | *discarded_events += uchan->per_pid_closed_app_discarded; | |
291 | *lost_packets += uchan->per_pid_closed_app_lost; | |
292 | } else { | |
293 | ERR("Unsupported buffer type"); | |
a0377dfe | 294 | abort(); |
fb83fe64 JD |
295 | ret = -1; |
296 | goto end; | |
297 | } | |
298 | ||
299 | end: | |
300 | return ret; | |
301 | } | |
302 | ||
3c6a091f | 303 | /* |
022d91ba | 304 | * Create a list of agent domain events. |
3c6a091f DG |
305 | * |
306 | * Return number of events in list on success or else a negative value. | |
307 | */ | |
8ddd72ef JR |
308 | static enum lttng_error_code list_lttng_agent_events( |
309 | struct agent *agt, struct lttng_payload *reply_payload, | |
310 | unsigned int *nb_events) | |
3c6a091f | 311 | { |
8ddd72ef JR |
312 | enum lttng_error_code ret_code; |
313 | int ret = 0; | |
314 | unsigned int local_nb_events = 0; | |
315 | struct agent_event *event; | |
3c6a091f | 316 | struct lttng_ht_iter iter; |
8ddd72ef | 317 | unsigned long agent_event_count; |
3c6a091f | 318 | |
8ddd72ef JR |
319 | assert(agt); |
320 | assert(reply_payload); | |
3c6a091f | 321 | |
022d91ba | 322 | DBG3("Listing agent events"); |
3c6a091f | 323 | |
e5bbf678 | 324 | rcu_read_lock(); |
8ddd72ef JR |
325 | agent_event_count = lttng_ht_get_count(agt->events); |
326 | if (agent_event_count == 0) { | |
327 | /* Early exit. */ | |
328 | goto end; | |
329 | } | |
7966af57 | 330 | |
8ddd72ef JR |
331 | if (agent_event_count > UINT_MAX) { |
332 | ret_code = LTTNG_ERR_OVERFLOW; | |
333 | goto error; | |
334 | } | |
e368fb43 | 335 | |
8ddd72ef | 336 | local_nb_events = (unsigned int) agent_event_count; |
e368fb43 | 337 | |
8ddd72ef JR |
338 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
339 | struct lttng_event *tmp_event = lttng_event_create(); | |
340 | ||
341 | if (!tmp_event) { | |
342 | ret_code = LTTNG_ERR_NOMEM; | |
343 | goto error; | |
3c02e545 | 344 | } |
b4e3ceb9 | 345 | |
8ddd72ef JR |
346 | if (lttng_strncpy(tmp_event->name, event->name, sizeof(tmp_event->name))) { |
347 | lttng_event_destroy(tmp_event); | |
348 | ret_code = LTTNG_ERR_FATAL; | |
349 | goto error; | |
350 | } | |
351 | ||
352 | tmp_event->name[sizeof(tmp_event->name) - 1] = '\0'; | |
353 | tmp_event->enabled = !!event->enabled_count; | |
354 | tmp_event->loglevel = event->loglevel_value; | |
355 | tmp_event->loglevel_type = event->loglevel_type; | |
3c6a091f | 356 | |
8ddd72ef JR |
357 | ret = lttng_event_serialize(tmp_event, 0, NULL, |
358 | event->filter_expression, 0, NULL, reply_payload); | |
359 | lttng_event_destroy(tmp_event); | |
3c02e545 | 360 | if (ret) { |
8ddd72ef JR |
361 | ret_code = LTTNG_ERR_FATAL; |
362 | goto error; | |
3c02e545 | 363 | } |
3c6a091f | 364 | } |
3c6a091f | 365 | |
47e52862 | 366 | end: |
8ddd72ef JR |
367 | ret_code = LTTNG_OK; |
368 | *nb_events = local_nb_events; | |
369 | error: | |
3c02e545 | 370 | rcu_read_unlock(); |
8ddd72ef | 371 | return ret_code; |
3c6a091f DG |
372 | } |
373 | ||
2f77fc4b DG |
374 | /* |
375 | * Create a list of ust global domain events. | |
376 | */ | |
8ddd72ef | 377 | static enum lttng_error_code list_lttng_ust_global_events(char *channel_name, |
b4e3ceb9 | 378 | struct ltt_ust_domain_global *ust_global, |
8ddd72ef JR |
379 | struct lttng_payload *reply_payload, |
380 | unsigned int *nb_events) | |
2f77fc4b | 381 | { |
8ddd72ef JR |
382 | enum lttng_error_code ret_code; |
383 | int ret; | |
2f77fc4b | 384 | struct lttng_ht_iter iter; |
8ddd72ef JR |
385 | struct lttng_ht_node_str *node; |
386 | struct ltt_ust_channel *uchan; | |
387 | struct ltt_ust_event *uevent; | |
388 | unsigned long channel_event_count; | |
389 | unsigned int local_nb_events = 0; | |
390 | ||
391 | assert(reply_payload); | |
392 | assert(nb_events); | |
2f77fc4b DG |
393 | |
394 | DBG("Listing UST global events for channel %s", channel_name); | |
395 | ||
396 | rcu_read_lock(); | |
397 | ||
e368fb43 | 398 | lttng_ht_lookup(ust_global->channels, (void *) channel_name, &iter); |
2f77fc4b DG |
399 | node = lttng_ht_iter_get_node_str(&iter); |
400 | if (node == NULL) { | |
8ddd72ef | 401 | ret_code = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
e68d8bdb | 402 | goto error; |
2f77fc4b DG |
403 | } |
404 | ||
405 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); | |
406 | ||
8ddd72ef JR |
407 | channel_event_count = lttng_ht_get_count(uchan->events); |
408 | if (channel_event_count == 0) { | |
409 | /* Early exit. */ | |
410 | ret_code = LTTNG_OK; | |
411 | goto end; | |
412 | } | |
413 | ||
414 | if (channel_event_count > UINT_MAX) { | |
415 | ret_code = LTTNG_ERR_OVERFLOW; | |
416 | goto error; | |
417 | } | |
418 | ||
419 | local_nb_events = (unsigned int) channel_event_count; | |
420 | ||
421 | DBG3("Listing UST global %d events", *nb_events); | |
2f77fc4b | 422 | |
b4e3ceb9 | 423 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
8ddd72ef | 424 | struct lttng_event *tmp_event = NULL; |
e368fb43 | 425 | |
b4e3ceb9 | 426 | if (uevent->internal) { |
8ddd72ef JR |
427 | /* This event should remain hidden from clients */ |
428 | local_nb_events--; | |
b4e3ceb9 PP |
429 | continue; |
430 | } | |
431 | ||
8ddd72ef JR |
432 | tmp_event = lttng_event_create(); |
433 | if (!tmp_event) { | |
434 | ret_code = LTTNG_ERR_NOMEM; | |
e68d8bdb | 435 | goto error; |
43ed1485 | 436 | } |
2f77fc4b | 437 | |
8ddd72ef JR |
438 | if (lttng_strncpy(tmp_event->name, uevent->attr.name, |
439 | LTTNG_SYMBOL_NAME_LEN)) { | |
440 | ret_code = LTTNG_ERR_FATAL; | |
441 | lttng_event_destroy(tmp_event); | |
e68d8bdb | 442 | goto error; |
8ddd72ef JR |
443 | } |
444 | ||
445 | tmp_event->name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
446 | tmp_event->enabled = uevent->enabled; | |
2f77fc4b DG |
447 | |
448 | switch (uevent->attr.instrumentation) { | |
fc4b93fa | 449 | case LTTNG_UST_ABI_TRACEPOINT: |
8ddd72ef | 450 | tmp_event->type = LTTNG_EVENT_TRACEPOINT; |
2f77fc4b | 451 | break; |
fc4b93fa | 452 | case LTTNG_UST_ABI_PROBE: |
8ddd72ef | 453 | tmp_event->type = LTTNG_EVENT_PROBE; |
2f77fc4b | 454 | break; |
fc4b93fa | 455 | case LTTNG_UST_ABI_FUNCTION: |
8ddd72ef | 456 | tmp_event->type = LTTNG_EVENT_FUNCTION; |
2f77fc4b DG |
457 | break; |
458 | } | |
459 | ||
8ddd72ef | 460 | tmp_event->loglevel = uevent->attr.loglevel; |
2f77fc4b | 461 | switch (uevent->attr.loglevel_type) { |
fc4b93fa | 462 | case LTTNG_UST_ABI_LOGLEVEL_ALL: |
8ddd72ef | 463 | tmp_event->loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; |
2f77fc4b | 464 | break; |
fc4b93fa | 465 | case LTTNG_UST_ABI_LOGLEVEL_RANGE: |
8ddd72ef | 466 | tmp_event->loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; |
2f77fc4b | 467 | break; |
fc4b93fa | 468 | case LTTNG_UST_ABI_LOGLEVEL_SINGLE: |
8ddd72ef | 469 | tmp_event->loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; |
2f77fc4b DG |
470 | break; |
471 | } | |
472 | if (uevent->filter) { | |
8ddd72ef | 473 | tmp_event->filter = 1; |
2f77fc4b | 474 | } |
4634f12e | 475 | if (uevent->exclusion) { |
8ddd72ef | 476 | tmp_event->exclusion = 1; |
4634f12e | 477 | } |
b4e3ceb9 | 478 | |
8ddd72ef JR |
479 | /* |
480 | * We do not care about the filter bytecode and the fd from the | |
481 | * userspace_probe_location. | |
482 | */ | |
483 | ret = lttng_event_serialize(tmp_event, uevent->exclusion ? uevent->exclusion->count : 0, | |
484 | uevent->exclusion ? (char **) uevent->exclusion ->names : NULL, | |
485 | uevent->filter_expression, 0, NULL, reply_payload); | |
486 | lttng_event_destroy(tmp_event); | |
3c02e545 | 487 | if (ret) { |
8ddd72ef JR |
488 | ret_code = LTTNG_ERR_FATAL; |
489 | goto error; | |
3c02e545 | 490 | } |
2f77fc4b DG |
491 | } |
492 | ||
d31d3e8c | 493 | end: |
8ddd72ef JR |
494 | /* nb_events is already set at this point. */ |
495 | ret_code = LTTNG_OK; | |
496 | *nb_events = local_nb_events; | |
497 | error: | |
2f77fc4b | 498 | rcu_read_unlock(); |
8ddd72ef | 499 | return ret_code; |
2f77fc4b DG |
500 | } |
501 | ||
502 | /* | |
503 | * Fill lttng_event array of all kernel events in the channel. | |
504 | */ | |
8ddd72ef | 505 | static enum lttng_error_code list_lttng_kernel_events(char *channel_name, |
b4e3ceb9 | 506 | struct ltt_kernel_session *kernel_session, |
8ddd72ef JR |
507 | struct lttng_payload *reply_payload, |
508 | unsigned int *nb_events) | |
2f77fc4b | 509 | { |
8ddd72ef | 510 | enum lttng_error_code ret_code; |
e368fb43 | 511 | int ret; |
8ddd72ef JR |
512 | struct ltt_kernel_event *event; |
513 | struct ltt_kernel_channel *kchan; | |
514 | ||
515 | assert(reply_payload); | |
2f77fc4b DG |
516 | |
517 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
518 | if (kchan == NULL) { | |
8ddd72ef JR |
519 | ret_code = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
520 | goto end; | |
2f77fc4b DG |
521 | } |
522 | ||
8ddd72ef | 523 | *nb_events = kchan->event_count; |
2f77fc4b DG |
524 | |
525 | DBG("Listing events for channel %s", kchan->channel->name); | |
526 | ||
8ddd72ef JR |
527 | if (*nb_events == 0) { |
528 | ret_code = LTTNG_OK; | |
529 | goto end; | |
530 | } | |
531 | ||
e368fb43 | 532 | /* Kernel channels */ |
8ddd72ef JR |
533 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { |
534 | struct lttng_event *tmp_event = lttng_event_create(); | |
2f77fc4b | 535 | |
8ddd72ef JR |
536 | if (!tmp_event) { |
537 | ret_code = LTTNG_ERR_NOMEM; | |
538 | goto end; | |
539 | } | |
540 | ||
541 | if (lttng_strncpy(tmp_event->name, event->event->name, LTTNG_SYMBOL_NAME_LEN)) { | |
542 | lttng_event_destroy(tmp_event); | |
543 | ret_code = LTTNG_ERR_FATAL; | |
43ed1485 | 544 | goto end; |
8ddd72ef | 545 | |
43ed1485 JG |
546 | } |
547 | ||
8ddd72ef JR |
548 | tmp_event->name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
549 | tmp_event->enabled = event->enabled; | |
550 | tmp_event->filter = (unsigned char) !!event->filter_expression; | |
b4e3ceb9 | 551 | |
8ddd72ef | 552 | switch (event->event->instrumentation) { |
b8e2fb80 | 553 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
8ddd72ef | 554 | tmp_event->type = LTTNG_EVENT_TRACEPOINT; |
2f77fc4b | 555 | break; |
b8e2fb80 | 556 | case LTTNG_KERNEL_ABI_KRETPROBE: |
8ddd72ef JR |
557 | tmp_event->type = LTTNG_EVENT_FUNCTION; |
558 | memcpy(&tmp_event->attr.probe, &event->event->u.kprobe, | |
b8e2fb80 | 559 | sizeof(struct lttng_kernel_abi_kprobe)); |
1896972b | 560 | break; |
b8e2fb80 | 561 | case LTTNG_KERNEL_ABI_KPROBE: |
8ddd72ef JR |
562 | tmp_event->type = LTTNG_EVENT_PROBE; |
563 | memcpy(&tmp_event->attr.probe, &event->event->u.kprobe, | |
b8e2fb80 | 564 | sizeof(struct lttng_kernel_abi_kprobe)); |
2f77fc4b | 565 | break; |
b8e2fb80 | 566 | case LTTNG_KERNEL_ABI_UPROBE: |
8ddd72ef | 567 | tmp_event->type = LTTNG_EVENT_USERSPACE_PROBE; |
b955b4d4 | 568 | break; |
b8e2fb80 | 569 | case LTTNG_KERNEL_ABI_FUNCTION: |
8ddd72ef JR |
570 | tmp_event->type = LTTNG_EVENT_FUNCTION; |
571 | memcpy(&(tmp_event->attr.ftrace), &event->event->u.ftrace, | |
b8e2fb80 | 572 | sizeof(struct lttng_kernel_abi_function)); |
2f77fc4b | 573 | break; |
b8e2fb80 | 574 | case LTTNG_KERNEL_ABI_NOOP: |
8ddd72ef | 575 | tmp_event->type = LTTNG_EVENT_NOOP; |
2f77fc4b | 576 | break; |
b8e2fb80 | 577 | case LTTNG_KERNEL_ABI_SYSCALL: |
8ddd72ef | 578 | tmp_event->type = LTTNG_EVENT_SYSCALL; |
2f77fc4b | 579 | break; |
b8e2fb80 | 580 | case LTTNG_KERNEL_ABI_ALL: |
1ab8c2ad FD |
581 | /* fall-through. */ |
582 | default: | |
a0377dfe | 583 | abort(); |
2f77fc4b DG |
584 | break; |
585 | } | |
b4e3ceb9 | 586 | |
8ddd72ef JR |
587 | if (event->userspace_probe_location) { |
588 | struct lttng_userspace_probe_location *location_copy = | |
589 | lttng_userspace_probe_location_copy( | |
590 | event->userspace_probe_location); | |
591 | ||
592 | if (!location_copy) { | |
593 | lttng_event_destroy(tmp_event); | |
594 | ret_code = LTTNG_ERR_NOMEM; | |
595 | goto end; | |
596 | } | |
597 | ||
598 | ret = lttng_event_set_userspace_probe_location( | |
599 | tmp_event, location_copy); | |
600 | if (ret) { | |
601 | lttng_event_destroy(tmp_event); | |
602 | lttng_userspace_probe_location_destroy( | |
603 | location_copy); | |
604 | ret_code = LTTNG_ERR_INVALID; | |
605 | goto end; | |
606 | } | |
e368fb43 | 607 | } |
e368fb43 | 608 | |
8ddd72ef JR |
609 | ret = lttng_event_serialize(tmp_event, 0, NULL, |
610 | event->filter_expression, 0, NULL, reply_payload); | |
611 | lttng_event_destroy(tmp_event); | |
3c02e545 | 612 | if (ret) { |
8ddd72ef JR |
613 | ret_code = LTTNG_ERR_FATAL; |
614 | goto end; | |
3c02e545 | 615 | } |
2f77fc4b DG |
616 | } |
617 | ||
8ddd72ef | 618 | ret_code = LTTNG_OK; |
db906c12 | 619 | end: |
8ddd72ef | 620 | return ret_code; |
2f77fc4b DG |
621 | } |
622 | ||
623 | /* | |
624 | * Add URI so the consumer output object. Set the correct path depending on the | |
625 | * domain adding the default trace directory. | |
626 | */ | |
b178f53e JG |
627 | static enum lttng_error_code add_uri_to_consumer( |
628 | const struct ltt_session *session, | |
629 | struct consumer_output *consumer, | |
630 | struct lttng_uri *uri, enum lttng_domain_type domain) | |
2f77fc4b | 631 | { |
b178f53e JG |
632 | int ret; |
633 | enum lttng_error_code ret_code = LTTNG_OK; | |
2f77fc4b | 634 | |
a0377dfe | 635 | LTTNG_ASSERT(uri); |
2f77fc4b DG |
636 | |
637 | if (consumer == NULL) { | |
638 | DBG("No consumer detected. Don't add URI. Stopping."); | |
b178f53e | 639 | ret_code = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
640 | goto error; |
641 | } | |
642 | ||
643 | switch (domain) { | |
644 | case LTTNG_DOMAIN_KERNEL: | |
b178f53e JG |
645 | ret = lttng_strncpy(consumer->domain_subdir, |
646 | DEFAULT_KERNEL_TRACE_DIR, | |
647 | sizeof(consumer->domain_subdir)); | |
2f77fc4b DG |
648 | break; |
649 | case LTTNG_DOMAIN_UST: | |
b178f53e JG |
650 | ret = lttng_strncpy(consumer->domain_subdir, |
651 | DEFAULT_UST_TRACE_DIR, | |
652 | sizeof(consumer->domain_subdir)); | |
2f77fc4b DG |
653 | break; |
654 | default: | |
655 | /* | |
b178f53e JG |
656 | * This case is possible is we try to add the URI to the global |
657 | * tracing session consumer object which in this case there is | |
658 | * no subdir. | |
2f77fc4b | 659 | */ |
b178f53e JG |
660 | memset(consumer->domain_subdir, 0, |
661 | sizeof(consumer->domain_subdir)); | |
662 | ret = 0; | |
663 | } | |
664 | if (ret) { | |
665 | ERR("Failed to initialize consumer output domain subdirectory"); | |
666 | ret_code = LTTNG_ERR_FATAL; | |
667 | goto error; | |
2f77fc4b DG |
668 | } |
669 | ||
670 | switch (uri->dtype) { | |
671 | case LTTNG_DST_IPV4: | |
672 | case LTTNG_DST_IPV6: | |
673 | DBG2("Setting network URI to consumer"); | |
674 | ||
df75acac DG |
675 | if (consumer->type == CONSUMER_DST_NET) { |
676 | if ((uri->stype == LTTNG_STREAM_CONTROL && | |
785d2d0d DG |
677 | consumer->dst.net.control_isset) || |
678 | (uri->stype == LTTNG_STREAM_DATA && | |
679 | consumer->dst.net.data_isset)) { | |
b178f53e | 680 | ret_code = LTTNG_ERR_URL_EXIST; |
df75acac DG |
681 | goto error; |
682 | } | |
683 | } else { | |
b178f53e | 684 | memset(&consumer->dst, 0, sizeof(consumer->dst)); |
785d2d0d DG |
685 | } |
686 | ||
2f77fc4b | 687 | /* Set URI into consumer output object */ |
b178f53e | 688 | ret = consumer_set_network_uri(session, consumer, uri); |
2f77fc4b | 689 | if (ret < 0) { |
7966af57 | 690 | ret_code = (lttng_error_code) -ret; |
2f77fc4b DG |
691 | goto error; |
692 | } else if (ret == 1) { | |
693 | /* | |
694 | * URI was the same in the consumer so we do not append the subdir | |
695 | * again so to not duplicate output dir. | |
696 | */ | |
b178f53e | 697 | ret_code = LTTNG_OK; |
2f77fc4b DG |
698 | goto error; |
699 | } | |
2f77fc4b DG |
700 | break; |
701 | case LTTNG_DST_PATH: | |
b178f53e JG |
702 | if (*uri->dst.path != '/' || strstr(uri->dst.path, "../")) { |
703 | ret_code = LTTNG_ERR_INVALID; | |
9ac05d92 MD |
704 | goto error; |
705 | } | |
b178f53e JG |
706 | DBG2("Setting trace directory path from URI to %s", |
707 | uri->dst.path); | |
708 | memset(&consumer->dst, 0, sizeof(consumer->dst)); | |
709 | ||
710 | ret = lttng_strncpy(consumer->dst.session_root_path, | |
711 | uri->dst.path, | |
712 | sizeof(consumer->dst.session_root_path)); | |
4df41cad JG |
713 | if (ret) { |
714 | ret_code = LTTNG_ERR_FATAL; | |
715 | goto error; | |
716 | } | |
2f77fc4b DG |
717 | consumer->type = CONSUMER_DST_LOCAL; |
718 | break; | |
719 | } | |
720 | ||
b178f53e | 721 | ret_code = LTTNG_OK; |
2f77fc4b | 722 | error: |
b178f53e | 723 | return ret_code; |
2f77fc4b DG |
724 | } |
725 | ||
726 | /* | |
727 | * Init tracing by creating trace directory and sending fds kernel consumer. | |
728 | */ | |
729 | static int init_kernel_tracing(struct ltt_kernel_session *session) | |
730 | { | |
731 | int ret = 0; | |
732 | struct lttng_ht_iter iter; | |
733 | struct consumer_socket *socket; | |
734 | ||
a0377dfe | 735 | LTTNG_ASSERT(session); |
2f77fc4b | 736 | |
e7fe706f DG |
737 | rcu_read_lock(); |
738 | ||
2f77fc4b DG |
739 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { |
740 | cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter, | |
741 | socket, node.node) { | |
2f77fc4b | 742 | pthread_mutex_lock(socket->lock); |
f50f23d9 | 743 | ret = kernel_consumer_send_session(socket, session); |
2f77fc4b DG |
744 | pthread_mutex_unlock(socket->lock); |
745 | if (ret < 0) { | |
f73fabfd | 746 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
747 | goto error; |
748 | } | |
749 | } | |
750 | } | |
751 | ||
752 | error: | |
e7fe706f | 753 | rcu_read_unlock(); |
2f77fc4b DG |
754 | return ret; |
755 | } | |
756 | ||
757 | /* | |
758 | * Create a socket to the relayd using the URI. | |
759 | * | |
760 | * On success, the relayd_sock pointer is set to the created socket. | |
9a654598 | 761 | * Else, it remains untouched and an LTTng error code is returned. |
2f77fc4b | 762 | */ |
9a654598 | 763 | static enum lttng_error_code create_connect_relayd(struct lttng_uri *uri, |
b31610f2 JD |
764 | struct lttcomm_relayd_sock **relayd_sock, |
765 | struct consumer_output *consumer) | |
2f77fc4b DG |
766 | { |
767 | int ret; | |
9a654598 | 768 | enum lttng_error_code status = LTTNG_OK; |
6151a90f | 769 | struct lttcomm_relayd_sock *rsock; |
2f77fc4b | 770 | |
6151a90f JD |
771 | rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR, |
772 | RELAYD_VERSION_COMM_MINOR); | |
773 | if (!rsock) { | |
9a654598 | 774 | status = LTTNG_ERR_FATAL; |
2f77fc4b DG |
775 | goto error; |
776 | } | |
777 | ||
ffe60014 DG |
778 | /* |
779 | * Connect to relayd so we can proceed with a session creation. This call | |
780 | * can possibly block for an arbitrary amount of time to set the health | |
781 | * state to be in poll execution. | |
782 | */ | |
783 | health_poll_entry(); | |
6151a90f | 784 | ret = relayd_connect(rsock); |
ffe60014 | 785 | health_poll_exit(); |
2f77fc4b DG |
786 | if (ret < 0) { |
787 | ERR("Unable to reach lttng-relayd"); | |
9a654598 | 788 | status = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
789 | goto free_sock; |
790 | } | |
791 | ||
792 | /* Create socket for control stream. */ | |
793 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
eacb7b6f MD |
794 | uint64_t result_flags; |
795 | ||
2f77fc4b DG |
796 | DBG3("Creating relayd stream socket from URI"); |
797 | ||
798 | /* Check relayd version */ | |
6151a90f | 799 | ret = relayd_version_check(rsock); |
67d5aa28 | 800 | if (ret == LTTNG_ERR_RELAYD_VERSION_FAIL) { |
9a654598 | 801 | status = LTTNG_ERR_RELAYD_VERSION_FAIL; |
67d5aa28 JD |
802 | goto close_sock; |
803 | } else if (ret < 0) { | |
804 | ERR("Unable to reach lttng-relayd"); | |
9a654598 | 805 | status = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
806 | goto close_sock; |
807 | } | |
b31610f2 JD |
808 | consumer->relay_major_version = rsock->major; |
809 | consumer->relay_minor_version = rsock->minor; | |
eacb7b6f MD |
810 | ret = relayd_get_configuration(rsock, 0, |
811 | &result_flags); | |
812 | if (ret < 0) { | |
813 | ERR("Unable to get relayd configuration"); | |
814 | status = LTTNG_ERR_RELAYD_CONNECT_FAIL; | |
815 | goto close_sock; | |
816 | } | |
817 | if (result_flags & LTTCOMM_RELAYD_CONFIGURATION_FLAG_CLEAR_ALLOWED) { | |
818 | consumer->relay_allows_clear = true; | |
819 | } | |
2f77fc4b DG |
820 | } else if (uri->stype == LTTNG_STREAM_DATA) { |
821 | DBG3("Creating relayd data socket from URI"); | |
822 | } else { | |
823 | /* Command is not valid */ | |
824 | ERR("Relayd invalid stream type: %d", uri->stype); | |
9a654598 | 825 | status = LTTNG_ERR_INVALID; |
2f77fc4b DG |
826 | goto close_sock; |
827 | } | |
828 | ||
6151a90f | 829 | *relayd_sock = rsock; |
2f77fc4b | 830 | |
9a654598 | 831 | return status; |
2f77fc4b DG |
832 | |
833 | close_sock: | |
6151a90f JD |
834 | /* The returned value is not useful since we are on an error path. */ |
835 | (void) relayd_close(rsock); | |
2f77fc4b | 836 | free_sock: |
6151a90f | 837 | free(rsock); |
2f77fc4b | 838 | error: |
9a654598 | 839 | return status; |
2f77fc4b DG |
840 | } |
841 | ||
842 | /* | |
843 | * Connect to the relayd using URI and send the socket to the right consumer. | |
43fade62 JG |
844 | * |
845 | * The consumer socket lock must be held by the caller. | |
9a654598 JG |
846 | * |
847 | * Returns LTTNG_OK on success or an LTTng error code on failure. | |
2f77fc4b | 848 | */ |
9a654598 JG |
849 | static enum lttng_error_code send_consumer_relayd_socket( |
850 | unsigned int session_id, | |
3044f922 | 851 | struct lttng_uri *relayd_uri, |
56a37563 | 852 | struct consumer_output *consumer, |
d3e2ba59 | 853 | struct consumer_socket *consumer_sock, |
fb9a95c4 | 854 | const char *session_name, const char *hostname, |
6fa5fe7c | 855 | const char *base_path, int session_live_timer, |
0e270a1e | 856 | const uint64_t *current_chunk_id, |
46ef2188 MD |
857 | time_t session_creation_time, |
858 | bool session_name_contains_creation_time) | |
2f77fc4b DG |
859 | { |
860 | int ret; | |
6151a90f | 861 | struct lttcomm_relayd_sock *rsock = NULL; |
9a654598 | 862 | enum lttng_error_code status; |
2f77fc4b | 863 | |
ffe60014 | 864 | /* Connect to relayd and make version check if uri is the control. */ |
9a654598 JG |
865 | status = create_connect_relayd(relayd_uri, &rsock, consumer); |
866 | if (status != LTTNG_OK) { | |
9e218353 | 867 | goto relayd_comm_error; |
ffe60014 | 868 | } |
a0377dfe | 869 | LTTNG_ASSERT(rsock); |
ffe60014 | 870 | |
2f77fc4b | 871 | /* Set the network sequence index if not set. */ |
d88aee68 DG |
872 | if (consumer->net_seq_index == (uint64_t) -1ULL) { |
873 | pthread_mutex_lock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
874 | /* |
875 | * Increment net_seq_idx because we are about to transfer the | |
876 | * new relayd socket to the consumer. | |
d88aee68 | 877 | * Assign unique key so the consumer can match streams. |
2f77fc4b | 878 | */ |
d88aee68 DG |
879 | consumer->net_seq_index = ++relayd_net_seq_idx; |
880 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
881 | } |
882 | ||
2f77fc4b | 883 | /* Send relayd socket to consumer. */ |
6151a90f | 884 | ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer, |
d3e2ba59 | 885 | relayd_uri->stype, session_id, |
6fa5fe7c MD |
886 | session_name, hostname, base_path, |
887 | session_live_timer, current_chunk_id, | |
46ef2188 | 888 | session_creation_time, session_name_contains_creation_time); |
2f77fc4b | 889 | if (ret < 0) { |
9a654598 | 890 | status = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
891 | goto close_sock; |
892 | } | |
893 | ||
c890b720 DG |
894 | /* Flag that the corresponding socket was sent. */ |
895 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
ffe60014 | 896 | consumer_sock->control_sock_sent = 1; |
c890b720 | 897 | } else if (relayd_uri->stype == LTTNG_STREAM_DATA) { |
ffe60014 | 898 | consumer_sock->data_sock_sent = 1; |
c890b720 DG |
899 | } |
900 | ||
2f77fc4b DG |
901 | /* |
902 | * Close socket which was dup on the consumer side. The session daemon does | |
903 | * NOT keep track of the relayd socket(s) once transfer to the consumer. | |
904 | */ | |
905 | ||
906 | close_sock: | |
9a654598 | 907 | if (status != LTTNG_OK) { |
ffe60014 | 908 | /* |
d9078d0c DG |
909 | * The consumer output for this session should not be used anymore |
910 | * since the relayd connection failed thus making any tracing or/and | |
911 | * streaming not usable. | |
ffe60014 | 912 | */ |
d9078d0c | 913 | consumer->enabled = 0; |
ffe60014 | 914 | } |
9e218353 JR |
915 | (void) relayd_close(rsock); |
916 | free(rsock); | |
917 | ||
918 | relayd_comm_error: | |
9a654598 | 919 | return status; |
2f77fc4b DG |
920 | } |
921 | ||
922 | /* | |
923 | * Send both relayd sockets to a specific consumer and domain. This is a | |
924 | * helper function to facilitate sending the information to the consumer for a | |
925 | * session. | |
43fade62 JG |
926 | * |
927 | * The consumer socket lock must be held by the caller. | |
9a654598 JG |
928 | * |
929 | * Returns LTTNG_OK, or an LTTng error code on failure. | |
2f77fc4b | 930 | */ |
9a654598 | 931 | static enum lttng_error_code send_consumer_relayd_sockets( |
56a37563 | 932 | unsigned int session_id, struct consumer_output *consumer, |
fb9a95c4 | 933 | struct consumer_socket *sock, const char *session_name, |
6fa5fe7c | 934 | const char *hostname, const char *base_path, int session_live_timer, |
46ef2188 MD |
935 | const uint64_t *current_chunk_id, time_t session_creation_time, |
936 | bool session_name_contains_creation_time) | |
2f77fc4b | 937 | { |
9a654598 | 938 | enum lttng_error_code status = LTTNG_OK; |
2f77fc4b | 939 | |
a0377dfe FD |
940 | LTTNG_ASSERT(consumer); |
941 | LTTNG_ASSERT(sock); | |
2f77fc4b | 942 | |
2f77fc4b | 943 | /* Sending control relayd socket. */ |
ffe60014 | 944 | if (!sock->control_sock_sent) { |
9a654598 | 945 | status = send_consumer_relayd_socket(session_id, |
d3e2ba59 | 946 | &consumer->dst.net.control, consumer, sock, |
6fa5fe7c | 947 | session_name, hostname, base_path, session_live_timer, |
46ef2188 MD |
948 | current_chunk_id, session_creation_time, |
949 | session_name_contains_creation_time); | |
9a654598 | 950 | if (status != LTTNG_OK) { |
c890b720 DG |
951 | goto error; |
952 | } | |
2f77fc4b DG |
953 | } |
954 | ||
955 | /* Sending data relayd socket. */ | |
ffe60014 | 956 | if (!sock->data_sock_sent) { |
9a654598 | 957 | status = send_consumer_relayd_socket(session_id, |
d3e2ba59 | 958 | &consumer->dst.net.data, consumer, sock, |
6fa5fe7c | 959 | session_name, hostname, base_path, session_live_timer, |
46ef2188 MD |
960 | current_chunk_id, session_creation_time, |
961 | session_name_contains_creation_time); | |
9a654598 | 962 | if (status != LTTNG_OK) { |
c890b720 DG |
963 | goto error; |
964 | } | |
2f77fc4b DG |
965 | } |
966 | ||
2f77fc4b | 967 | error: |
9a654598 | 968 | return status; |
2f77fc4b DG |
969 | } |
970 | ||
971 | /* | |
972 | * Setup relayd connections for a tracing session. First creates the socket to | |
973 | * the relayd and send them to the right domain consumer. Consumer type MUST be | |
974 | * network. | |
975 | */ | |
ffe60014 | 976 | int cmd_setup_relayd(struct ltt_session *session) |
2f77fc4b | 977 | { |
f73fabfd | 978 | int ret = LTTNG_OK; |
2f77fc4b DG |
979 | struct ltt_ust_session *usess; |
980 | struct ltt_kernel_session *ksess; | |
981 | struct consumer_socket *socket; | |
982 | struct lttng_ht_iter iter; | |
0e270a1e | 983 | LTTNG_OPTIONAL(uint64_t) current_chunk_id = {}; |
2f77fc4b | 984 | |
a0377dfe | 985 | LTTNG_ASSERT(session); |
2f77fc4b DG |
986 | |
987 | usess = session->ust_session; | |
988 | ksess = session->kernel_session; | |
989 | ||
785d2d0d | 990 | DBG("Setting relayd for session %s", session->name); |
2f77fc4b | 991 | |
aa997ea3 | 992 | rcu_read_lock(); |
1e791a74 JG |
993 | if (session->current_trace_chunk) { |
994 | enum lttng_trace_chunk_status status = lttng_trace_chunk_get_id( | |
995 | session->current_trace_chunk, ¤t_chunk_id.value); | |
996 | ||
997 | if (status == LTTNG_TRACE_CHUNK_STATUS_OK) { | |
998 | current_chunk_id.is_set = true; | |
999 | } else { | |
1000 | ERR("Failed to get current trace chunk id"); | |
1001 | ret = LTTNG_ERR_UNK; | |
1002 | goto error; | |
1003 | } | |
1004 | } | |
1005 | ||
2f77fc4b DG |
1006 | if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET |
1007 | && usess->consumer->enabled) { | |
1008 | /* For each consumer socket, send relayd sockets */ | |
1009 | cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, | |
1010 | socket, node.node) { | |
2f77fc4b | 1011 | pthread_mutex_lock(socket->lock); |
f46376a1 | 1012 | ret = send_consumer_relayd_sockets(session->id, |
d3e2ba59 JD |
1013 | usess->consumer, socket, |
1014 | session->name, session->hostname, | |
6fa5fe7c | 1015 | session->base_path, |
1e791a74 | 1016 | session->live_timer, |
db1da059 | 1017 | current_chunk_id.is_set ? ¤t_chunk_id.value : NULL, |
46ef2188 MD |
1018 | session->creation_time, |
1019 | session->name_contains_creation_time); | |
2f77fc4b | 1020 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1021 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1022 | goto error; |
1023 | } | |
6dc3064a DG |
1024 | /* Session is now ready for network streaming. */ |
1025 | session->net_handle = 1; | |
2f77fc4b | 1026 | } |
b31610f2 JD |
1027 | session->consumer->relay_major_version = |
1028 | usess->consumer->relay_major_version; | |
1029 | session->consumer->relay_minor_version = | |
1030 | usess->consumer->relay_minor_version; | |
eacb7b6f MD |
1031 | session->consumer->relay_allows_clear = |
1032 | usess->consumer->relay_allows_clear; | |
2f77fc4b DG |
1033 | } |
1034 | ||
1035 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET | |
1036 | && ksess->consumer->enabled) { | |
1037 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1038 | socket, node.node) { | |
2f77fc4b | 1039 | pthread_mutex_lock(socket->lock); |
f46376a1 | 1040 | ret = send_consumer_relayd_sockets(session->id, |
d3e2ba59 JD |
1041 | ksess->consumer, socket, |
1042 | session->name, session->hostname, | |
6fa5fe7c | 1043 | session->base_path, |
1e791a74 | 1044 | session->live_timer, |
db1da059 | 1045 | current_chunk_id.is_set ? ¤t_chunk_id.value : NULL, |
46ef2188 MD |
1046 | session->creation_time, |
1047 | session->name_contains_creation_time); | |
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; | |
eacb7b6f MD |
1059 | session->consumer->relay_allows_clear = |
1060 | ksess->consumer->relay_allows_clear; | |
2f77fc4b DG |
1061 | } |
1062 | ||
1063 | error: | |
e7fe706f | 1064 | rcu_read_unlock(); |
2f77fc4b DG |
1065 | return ret; |
1066 | } | |
1067 | ||
9b6c7ec5 DG |
1068 | /* |
1069 | * Start a kernel session by opening all necessary streams. | |
1070 | */ | |
4dbe1875 | 1071 | int start_kernel_session(struct ltt_kernel_session *ksess) |
9b6c7ec5 DG |
1072 | { |
1073 | int ret; | |
1074 | struct ltt_kernel_channel *kchan; | |
1075 | ||
1076 | /* Open kernel metadata */ | |
07b86b52 | 1077 | if (ksess->metadata == NULL && ksess->output_traces) { |
9b6c7ec5 DG |
1078 | ret = kernel_open_metadata(ksess); |
1079 | if (ret < 0) { | |
1080 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1081 | goto error; | |
1082 | } | |
1083 | } | |
1084 | ||
1085 | /* Open kernel metadata stream */ | |
07b86b52 | 1086 | if (ksess->metadata && ksess->metadata_stream_fd < 0) { |
9b6c7ec5 DG |
1087 | ret = kernel_open_metadata_stream(ksess); |
1088 | if (ret < 0) { | |
1089 | ERR("Kernel create metadata stream failed"); | |
1090 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1091 | goto error; | |
1092 | } | |
1093 | } | |
1094 | ||
1095 | /* For each channel */ | |
1096 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
1097 | if (kchan->stream_count == 0) { | |
1098 | ret = kernel_open_channel_stream(kchan); | |
1099 | if (ret < 0) { | |
1100 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1101 | goto error; | |
1102 | } | |
1103 | /* Update the stream global counter */ | |
1104 | ksess->stream_count_global += ret; | |
1105 | } | |
1106 | } | |
1107 | ||
1108 | /* Setup kernel consumer socket and send fds to it */ | |
1109 | ret = init_kernel_tracing(ksess); | |
e43c41c5 | 1110 | if (ret != 0) { |
9b6c7ec5 DG |
1111 | ret = LTTNG_ERR_KERN_START_FAIL; |
1112 | goto error; | |
1113 | } | |
1114 | ||
1115 | /* This start the kernel tracing */ | |
1116 | ret = kernel_start_session(ksess); | |
1117 | if (ret < 0) { | |
1118 | ret = LTTNG_ERR_KERN_START_FAIL; | |
1119 | goto error; | |
1120 | } | |
1121 | ||
1122 | /* Quiescent wait after starting trace */ | |
7d268848 | 1123 | kernel_wait_quiescent(); |
9b6c7ec5 | 1124 | |
14fb1ebe | 1125 | ksess->active = 1; |
9b6c7ec5 DG |
1126 | |
1127 | ret = LTTNG_OK; | |
1128 | ||
1129 | error: | |
1130 | return ret; | |
1131 | } | |
1132 | ||
4dbe1875 MD |
1133 | int stop_kernel_session(struct ltt_kernel_session *ksess) |
1134 | { | |
1135 | struct ltt_kernel_channel *kchan; | |
1136 | bool error_occurred = false; | |
1137 | int ret; | |
1138 | ||
1139 | if (!ksess || !ksess->active) { | |
1140 | return LTTNG_OK; | |
1141 | } | |
1142 | DBG("Stopping kernel tracing"); | |
1143 | ||
1144 | ret = kernel_stop_session(ksess); | |
1145 | if (ret < 0) { | |
1146 | ret = LTTNG_ERR_KERN_STOP_FAIL; | |
1147 | goto error; | |
1148 | } | |
1149 | ||
1150 | kernel_wait_quiescent(); | |
1151 | ||
1152 | /* Flush metadata after stopping (if exists) */ | |
1153 | if (ksess->metadata_stream_fd >= 0) { | |
1154 | ret = kernel_metadata_flush_buffer(ksess->metadata_stream_fd); | |
1155 | if (ret < 0) { | |
1156 | ERR("Kernel metadata flush failed"); | |
1157 | error_occurred = true; | |
1158 | } | |
1159 | } | |
1160 | ||
1161 | /* Flush all buffers after stopping */ | |
1162 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
1163 | ret = kernel_flush_buffer(kchan); | |
1164 | if (ret < 0) { | |
1165 | ERR("Kernel flush buffer error"); | |
1166 | error_occurred = true; | |
1167 | } | |
1168 | } | |
1169 | ||
1170 | ksess->active = 0; | |
1171 | if (error_occurred) { | |
1172 | ret = LTTNG_ERR_UNK; | |
1173 | } else { | |
1174 | ret = LTTNG_OK; | |
1175 | } | |
1176 | error: | |
1177 | return ret; | |
1178 | } | |
1179 | ||
2f77fc4b DG |
1180 | /* |
1181 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. | |
1182 | */ | |
56a37563 JG |
1183 | int cmd_disable_channel(struct ltt_session *session, |
1184 | enum lttng_domain_type domain, char *channel_name) | |
2f77fc4b DG |
1185 | { |
1186 | int ret; | |
1187 | struct ltt_ust_session *usess; | |
1188 | ||
1189 | usess = session->ust_session; | |
1190 | ||
2223c96f DG |
1191 | rcu_read_lock(); |
1192 | ||
2f77fc4b DG |
1193 | switch (domain) { |
1194 | case LTTNG_DOMAIN_KERNEL: | |
1195 | { | |
1196 | ret = channel_kernel_disable(session->kernel_session, | |
1197 | channel_name); | |
f73fabfd | 1198 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1199 | goto error; |
1200 | } | |
1201 | ||
7d268848 | 1202 | kernel_wait_quiescent(); |
2f77fc4b DG |
1203 | break; |
1204 | } | |
1205 | case LTTNG_DOMAIN_UST: | |
1206 | { | |
1207 | struct ltt_ust_channel *uchan; | |
1208 | struct lttng_ht *chan_ht; | |
1209 | ||
1210 | chan_ht = usess->domain_global.channels; | |
1211 | ||
1212 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
1213 | if (uchan == NULL) { | |
f73fabfd | 1214 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
1215 | goto error; |
1216 | } | |
1217 | ||
7972aab2 | 1218 | ret = channel_ust_disable(usess, uchan); |
f73fabfd | 1219 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1220 | goto error; |
1221 | } | |
1222 | break; | |
1223 | } | |
2f77fc4b | 1224 | default: |
f73fabfd | 1225 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1226 | goto error; |
1227 | } | |
1228 | ||
f73fabfd | 1229 | ret = LTTNG_OK; |
2f77fc4b DG |
1230 | |
1231 | error: | |
2223c96f | 1232 | rcu_read_unlock(); |
2f77fc4b DG |
1233 | return ret; |
1234 | } | |
1235 | ||
1236 | /* | |
1237 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
1238 | * | |
1239 | * The wpipe arguments is used as a notifier for the kernel thread. | |
1240 | */ | |
999af9c1 JR |
1241 | int cmd_enable_channel(struct command_ctx *cmd_ctx, int sock, int wpipe) |
1242 | { | |
1243 | int ret; | |
1244 | size_t channel_len; | |
1245 | ssize_t sock_recv_len; | |
1246 | struct lttng_channel *channel = NULL; | |
1247 | struct lttng_buffer_view view; | |
1248 | struct lttng_dynamic_buffer channel_buffer; | |
1249 | const struct lttng_domain command_domain = cmd_ctx->lsm.domain; | |
1250 | ||
1251 | lttng_dynamic_buffer_init(&channel_buffer); | |
1252 | channel_len = (size_t) cmd_ctx->lsm.u.channel.length; | |
1253 | ret = lttng_dynamic_buffer_set_size(&channel_buffer, channel_len); | |
1254 | if (ret) { | |
1255 | ret = LTTNG_ERR_NOMEM; | |
1256 | goto end; | |
1257 | } | |
1258 | ||
1259 | sock_recv_len = lttcomm_recv_unix_sock(sock, channel_buffer.data, | |
1260 | channel_len); | |
1261 | if (sock_recv_len < 0 || sock_recv_len != channel_len) { | |
1262 | ERR("Failed to receive \"enable channel\" command payload"); | |
1263 | ret = LTTNG_ERR_INVALID; | |
1264 | goto end; | |
1265 | } | |
1266 | ||
1267 | view = lttng_buffer_view_from_dynamic_buffer(&channel_buffer, 0, channel_len); | |
1268 | if (!lttng_buffer_view_is_valid(&view)) { | |
1269 | ret = LTTNG_ERR_INVALID; | |
1270 | goto end; | |
1271 | } | |
1272 | ||
1273 | if (lttng_channel_create_from_buffer(&view, &channel) != channel_len) { | |
1274 | ERR("Invalid channel payload received in \"enable channel\" command"); | |
1275 | ret = LTTNG_ERR_INVALID; | |
1276 | goto end; | |
1277 | } | |
1278 | ||
1279 | ret = cmd_enable_channel_internal( | |
1280 | cmd_ctx->session, &command_domain, channel, wpipe); | |
1281 | ||
1282 | end: | |
1283 | lttng_dynamic_buffer_reset(&channel_buffer); | |
1284 | lttng_channel_destroy(channel); | |
1285 | return ret; | |
1286 | } | |
1287 | ||
4878de5c JG |
1288 | static enum lttng_error_code cmd_enable_channel_internal( |
1289 | struct ltt_session *session, | |
999af9c1 JR |
1290 | const struct lttng_domain *domain, |
1291 | const struct lttng_channel *_attr, | |
1292 | int wpipe) | |
2f77fc4b | 1293 | { |
4878de5c | 1294 | enum lttng_error_code ret_code; |
2f77fc4b DG |
1295 | struct ltt_ust_session *usess = session->ust_session; |
1296 | struct lttng_ht *chan_ht; | |
1f345e94 | 1297 | size_t len; |
999af9c1 | 1298 | struct lttng_channel *attr = NULL; |
2f77fc4b | 1299 | |
a0377dfe FD |
1300 | LTTNG_ASSERT(session); |
1301 | LTTNG_ASSERT(_attr); | |
1302 | LTTNG_ASSERT(domain); | |
2f77fc4b | 1303 | |
999af9c1 JR |
1304 | attr = lttng_channel_copy(_attr); |
1305 | if (!attr) { | |
4878de5c | 1306 | ret_code = LTTNG_ERR_NOMEM; |
999af9c1 JR |
1307 | goto end; |
1308 | } | |
1309 | ||
1310 | len = lttng_strnlen(attr->name, sizeof(attr->name)); | |
1f345e94 PP |
1311 | |
1312 | /* Validate channel name */ | |
999af9c1 JR |
1313 | if (attr->name[0] == '.' || |
1314 | memchr(attr->name, '/', len) != NULL) { | |
4878de5c | 1315 | ret_code = LTTNG_ERR_INVALID_CHANNEL_NAME; |
1f345e94 PP |
1316 | goto end; |
1317 | } | |
1318 | ||
999af9c1 | 1319 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
2f77fc4b | 1320 | |
03b4fdcf DG |
1321 | rcu_read_lock(); |
1322 | ||
ecc48a90 JD |
1323 | /* |
1324 | * If the session is a live session, remove the switch timer, the | |
1325 | * live timer does the same thing but sends also synchronisation | |
1326 | * beacons for inactive streams. | |
1327 | */ | |
1328 | if (session->live_timer > 0) { | |
999af9c1 JR |
1329 | attr->attr.live_timer_interval = session->live_timer; |
1330 | attr->attr.switch_timer_interval = 0; | |
ecc48a90 JD |
1331 | } |
1332 | ||
6e21424e JR |
1333 | /* Check for feature support */ |
1334 | switch (domain->type) { | |
1335 | case LTTNG_DOMAIN_KERNEL: | |
1336 | { | |
7d268848 | 1337 | if (kernel_supports_ring_buffer_snapshot_sample_positions() != 1) { |
6e21424e JR |
1338 | /* Sampling position of buffer is not supported */ |
1339 | WARN("Kernel tracer does not support buffer monitoring. " | |
1340 | "Setting the monitor interval timer to 0 " | |
1341 | "(disabled) for channel '%s' of session '%s'", | |
999af9c1 JR |
1342 | attr->name, session->name); |
1343 | lttng_channel_set_monitor_timer_interval(attr, 0); | |
6e21424e JR |
1344 | } |
1345 | break; | |
1346 | } | |
1347 | case LTTNG_DOMAIN_UST: | |
f28f9e44 | 1348 | break; |
6e21424e JR |
1349 | case LTTNG_DOMAIN_JUL: |
1350 | case LTTNG_DOMAIN_LOG4J: | |
1351 | case LTTNG_DOMAIN_PYTHON: | |
f28f9e44 JG |
1352 | if (!agent_tracing_is_enabled()) { |
1353 | DBG("Attempted to enable a channel in an agent domain but the agent thread is not running"); | |
4878de5c | 1354 | ret_code = LTTNG_ERR_AGENT_TRACING_DISABLED; |
f28f9e44 JG |
1355 | goto error; |
1356 | } | |
6e21424e JR |
1357 | break; |
1358 | default: | |
4878de5c | 1359 | ret_code = LTTNG_ERR_UNKNOWN_DOMAIN; |
6e21424e JR |
1360 | goto error; |
1361 | } | |
1362 | ||
7972aab2 | 1363 | switch (domain->type) { |
2f77fc4b DG |
1364 | case LTTNG_DOMAIN_KERNEL: |
1365 | { | |
1366 | struct ltt_kernel_channel *kchan; | |
1367 | ||
999af9c1 JR |
1368 | kchan = trace_kernel_get_channel_by_name( |
1369 | attr->name, session->kernel_session); | |
2f77fc4b | 1370 | if (kchan == NULL) { |
8cc65d5c JR |
1371 | /* |
1372 | * Don't try to create a channel if the session has been started at | |
1373 | * some point in time before. The tracer does not allow it. | |
1374 | */ | |
1375 | if (session->has_been_started) { | |
4878de5c | 1376 | ret_code = LTTNG_ERR_TRACE_ALREADY_STARTED; |
8cc65d5c JR |
1377 | goto error; |
1378 | } | |
1379 | ||
54213acc JG |
1380 | if (session->snapshot.nb_output > 0 || |
1381 | session->snapshot_mode) { | |
1382 | /* Enforce mmap output for snapshot sessions. */ | |
999af9c1 | 1383 | attr->attr.output = LTTNG_EVENT_MMAP; |
54213acc | 1384 | } |
4878de5c | 1385 | ret_code = channel_kernel_create( |
999af9c1 JR |
1386 | session->kernel_session, attr, wpipe); |
1387 | if (attr->name[0] != '\0') { | |
85076754 MD |
1388 | session->kernel_session->has_non_default_channel = 1; |
1389 | } | |
2f77fc4b | 1390 | } else { |
4878de5c | 1391 | ret_code = channel_kernel_enable(session->kernel_session, kchan); |
2f77fc4b DG |
1392 | } |
1393 | ||
4878de5c | 1394 | if (ret_code != LTTNG_OK) { |
2f77fc4b DG |
1395 | goto error; |
1396 | } | |
1397 | ||
7d268848 | 1398 | kernel_wait_quiescent(); |
2f77fc4b DG |
1399 | break; |
1400 | } | |
1401 | case LTTNG_DOMAIN_UST: | |
9232818f JG |
1402 | case LTTNG_DOMAIN_JUL: |
1403 | case LTTNG_DOMAIN_LOG4J: | |
1404 | case LTTNG_DOMAIN_PYTHON: | |
2f77fc4b DG |
1405 | { |
1406 | struct ltt_ust_channel *uchan; | |
1407 | ||
9232818f JG |
1408 | /* |
1409 | * FIXME | |
1410 | * | |
1411 | * Current agent implementation limitations force us to allow | |
1412 | * only one channel at once in "agent" subdomains. Each | |
1413 | * subdomain has a default channel name which must be strictly | |
1414 | * adhered to. | |
1415 | */ | |
1416 | if (domain->type == LTTNG_DOMAIN_JUL) { | |
999af9c1 | 1417 | if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME, |
9232818f | 1418 | LTTNG_SYMBOL_NAME_LEN)) { |
4878de5c | 1419 | ret_code = LTTNG_ERR_INVALID_CHANNEL_NAME; |
9232818f JG |
1420 | goto error; |
1421 | } | |
1422 | } else if (domain->type == LTTNG_DOMAIN_LOG4J) { | |
999af9c1 | 1423 | if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME, |
9232818f | 1424 | LTTNG_SYMBOL_NAME_LEN)) { |
4878de5c | 1425 | ret_code = LTTNG_ERR_INVALID_CHANNEL_NAME; |
9232818f JG |
1426 | goto error; |
1427 | } | |
1428 | } else if (domain->type == LTTNG_DOMAIN_PYTHON) { | |
999af9c1 | 1429 | if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME, |
9232818f | 1430 | LTTNG_SYMBOL_NAME_LEN)) { |
4878de5c | 1431 | ret_code = LTTNG_ERR_INVALID_CHANNEL_NAME; |
9232818f JG |
1432 | goto error; |
1433 | } | |
1434 | } | |
1435 | ||
2f77fc4b DG |
1436 | chan_ht = usess->domain_global.channels; |
1437 | ||
999af9c1 | 1438 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); |
2f77fc4b | 1439 | if (uchan == NULL) { |
8cc65d5c JR |
1440 | /* |
1441 | * Don't try to create a channel if the session has been started at | |
1442 | * some point in time before. The tracer does not allow it. | |
1443 | */ | |
1444 | if (session->has_been_started) { | |
4878de5c | 1445 | ret_code = LTTNG_ERR_TRACE_ALREADY_STARTED; |
8cc65d5c JR |
1446 | goto error; |
1447 | } | |
1448 | ||
4878de5c | 1449 | ret_code = channel_ust_create(usess, attr, domain->buf_type); |
999af9c1 | 1450 | if (attr->name[0] != '\0') { |
85076754 MD |
1451 | usess->has_non_default_channel = 1; |
1452 | } | |
2f77fc4b | 1453 | } else { |
4878de5c | 1454 | ret_code = channel_ust_enable(usess, uchan); |
2f77fc4b DG |
1455 | } |
1456 | break; | |
1457 | } | |
2f77fc4b | 1458 | default: |
4878de5c | 1459 | ret_code = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1460 | goto error; |
1461 | } | |
1462 | ||
4878de5c | 1463 | if (ret_code == LTTNG_OK && attr->attr.output != LTTNG_EVENT_MMAP) { |
54213acc JG |
1464 | session->has_non_mmap_channel = true; |
1465 | } | |
2f77fc4b | 1466 | error: |
2223c96f | 1467 | rcu_read_unlock(); |
1f345e94 | 1468 | end: |
999af9c1 | 1469 | lttng_channel_destroy(attr); |
4878de5c | 1470 | return ret_code; |
2f77fc4b DG |
1471 | } |
1472 | ||
159b042f JG |
1473 | enum lttng_error_code cmd_process_attr_tracker_get_tracking_policy( |
1474 | struct ltt_session *session, | |
1475 | enum lttng_domain_type domain, | |
1476 | enum lttng_process_attr process_attr, | |
1477 | enum lttng_tracking_policy *policy) | |
1478 | { | |
1479 | enum lttng_error_code ret_code = LTTNG_OK; | |
1480 | const struct process_attr_tracker *tracker; | |
1481 | ||
1482 | switch (domain) { | |
1483 | case LTTNG_DOMAIN_KERNEL: | |
1484 | if (!session->kernel_session) { | |
1485 | ret_code = LTTNG_ERR_INVALID; | |
1486 | goto end; | |
1487 | } | |
1488 | tracker = kernel_get_process_attr_tracker( | |
1489 | session->kernel_session, process_attr); | |
1490 | break; | |
1491 | case LTTNG_DOMAIN_UST: | |
1492 | if (!session->ust_session) { | |
1493 | ret_code = LTTNG_ERR_INVALID; | |
1494 | goto end; | |
1495 | } | |
1496 | tracker = trace_ust_get_process_attr_tracker( | |
1497 | session->ust_session, process_attr); | |
1498 | break; | |
1499 | default: | |
1500 | ret_code = LTTNG_ERR_UNSUPPORTED_DOMAIN; | |
1501 | goto end; | |
1502 | } | |
1503 | if (tracker) { | |
1504 | *policy = process_attr_tracker_get_tracking_policy(tracker); | |
1505 | } else { | |
1506 | ret_code = LTTNG_ERR_INVALID; | |
1507 | } | |
1508 | end: | |
1509 | return ret_code; | |
1510 | } | |
1511 | ||
1512 | enum lttng_error_code cmd_process_attr_tracker_set_tracking_policy( | |
1513 | struct ltt_session *session, | |
1514 | enum lttng_domain_type domain, | |
1515 | enum lttng_process_attr process_attr, | |
1516 | enum lttng_tracking_policy policy) | |
1517 | { | |
1518 | enum lttng_error_code ret_code = LTTNG_OK; | |
1519 | ||
1520 | switch (policy) { | |
1521 | case LTTNG_TRACKING_POLICY_INCLUDE_SET: | |
1522 | case LTTNG_TRACKING_POLICY_EXCLUDE_ALL: | |
1523 | case LTTNG_TRACKING_POLICY_INCLUDE_ALL: | |
1524 | break; | |
1525 | default: | |
1526 | ret_code = LTTNG_ERR_INVALID; | |
1527 | goto end; | |
1528 | } | |
1529 | ||
1530 | switch (domain) { | |
1531 | case LTTNG_DOMAIN_KERNEL: | |
1532 | if (!session->kernel_session) { | |
1533 | ret_code = LTTNG_ERR_INVALID; | |
1534 | goto end; | |
1535 | } | |
1536 | ret_code = kernel_process_attr_tracker_set_tracking_policy( | |
1537 | session->kernel_session, process_attr, policy); | |
1538 | break; | |
1539 | case LTTNG_DOMAIN_UST: | |
1540 | if (!session->ust_session) { | |
1541 | ret_code = LTTNG_ERR_INVALID; | |
1542 | goto end; | |
1543 | } | |
1544 | ret_code = trace_ust_process_attr_tracker_set_tracking_policy( | |
1545 | session->ust_session, process_attr, policy); | |
1546 | break; | |
1547 | default: | |
1548 | ret_code = LTTNG_ERR_UNSUPPORTED_DOMAIN; | |
1549 | break; | |
1550 | } | |
1551 | end: | |
1552 | return ret_code; | |
1553 | } | |
1554 | ||
1555 | enum lttng_error_code cmd_process_attr_tracker_inclusion_set_add_value( | |
1556 | struct ltt_session *session, | |
1557 | enum lttng_domain_type domain, | |
1558 | enum lttng_process_attr process_attr, | |
1559 | const struct process_attr_value *value) | |
1560 | { | |
1561 | enum lttng_error_code ret_code = LTTNG_OK; | |
1562 | ||
1563 | switch (domain) { | |
1564 | case LTTNG_DOMAIN_KERNEL: | |
1565 | if (!session->kernel_session) { | |
1566 | ret_code = LTTNG_ERR_INVALID; | |
1567 | goto end; | |
1568 | } | |
1569 | ret_code = kernel_process_attr_tracker_inclusion_set_add_value( | |
1570 | session->kernel_session, process_attr, value); | |
1571 | break; | |
1572 | case LTTNG_DOMAIN_UST: | |
1573 | if (!session->ust_session) { | |
1574 | ret_code = LTTNG_ERR_INVALID; | |
1575 | goto end; | |
1576 | } | |
1577 | ret_code = trace_ust_process_attr_tracker_inclusion_set_add_value( | |
1578 | session->ust_session, process_attr, value); | |
1579 | break; | |
1580 | default: | |
1581 | ret_code = LTTNG_ERR_UNSUPPORTED_DOMAIN; | |
1582 | break; | |
1583 | } | |
1584 | end: | |
1585 | return ret_code; | |
1586 | } | |
1587 | ||
1588 | enum lttng_error_code cmd_process_attr_tracker_inclusion_set_remove_value( | |
1589 | struct ltt_session *session, | |
1590 | enum lttng_domain_type domain, | |
1591 | enum lttng_process_attr process_attr, | |
1592 | const struct process_attr_value *value) | |
1593 | { | |
1594 | enum lttng_error_code ret_code = LTTNG_OK; | |
1595 | ||
1596 | switch (domain) { | |
1597 | case LTTNG_DOMAIN_KERNEL: | |
1598 | if (!session->kernel_session) { | |
1599 | ret_code = LTTNG_ERR_INVALID; | |
1600 | goto end; | |
1601 | } | |
1602 | ret_code = kernel_process_attr_tracker_inclusion_set_remove_value( | |
1603 | session->kernel_session, process_attr, value); | |
1604 | break; | |
1605 | case LTTNG_DOMAIN_UST: | |
1606 | if (!session->ust_session) { | |
1607 | ret_code = LTTNG_ERR_INVALID; | |
1608 | goto end; | |
1609 | } | |
1610 | ret_code = trace_ust_process_attr_tracker_inclusion_set_remove_value( | |
1611 | session->ust_session, process_attr, value); | |
1612 | break; | |
1613 | default: | |
1614 | ret_code = LTTNG_ERR_UNSUPPORTED_DOMAIN; | |
1615 | break; | |
1616 | } | |
1617 | end: | |
1618 | return ret_code; | |
1619 | } | |
1620 | ||
1621 | enum lttng_error_code cmd_process_attr_tracker_get_inclusion_set( | |
1622 | struct ltt_session *session, | |
1623 | enum lttng_domain_type domain, | |
1624 | enum lttng_process_attr process_attr, | |
1625 | struct lttng_process_attr_values **values) | |
1626 | { | |
1627 | enum lttng_error_code ret_code = LTTNG_OK; | |
1628 | const struct process_attr_tracker *tracker; | |
1629 | enum process_attr_tracker_status status; | |
1630 | ||
1631 | switch (domain) { | |
1632 | case LTTNG_DOMAIN_KERNEL: | |
1633 | if (!session->kernel_session) { | |
1634 | ret_code = LTTNG_ERR_INVALID; | |
1635 | goto end; | |
1636 | } | |
1637 | tracker = kernel_get_process_attr_tracker( | |
1638 | session->kernel_session, process_attr); | |
1639 | break; | |
1640 | case LTTNG_DOMAIN_UST: | |
1641 | if (!session->ust_session) { | |
1642 | ret_code = LTTNG_ERR_INVALID; | |
1643 | goto end; | |
1644 | } | |
1645 | tracker = trace_ust_get_process_attr_tracker( | |
1646 | session->ust_session, process_attr); | |
1647 | break; | |
1648 | default: | |
1649 | ret_code = LTTNG_ERR_UNSUPPORTED_DOMAIN; | |
1650 | goto end; | |
1651 | } | |
1652 | ||
1653 | if (!tracker) { | |
1654 | ret_code = LTTNG_ERR_INVALID; | |
1655 | goto end; | |
1656 | } | |
1657 | ||
1658 | status = process_attr_tracker_get_inclusion_set(tracker, values); | |
1659 | switch (status) { | |
1660 | case PROCESS_ATTR_TRACKER_STATUS_OK: | |
1661 | ret_code = LTTNG_OK; | |
1662 | break; | |
1663 | case PROCESS_ATTR_TRACKER_STATUS_INVALID_TRACKING_POLICY: | |
1664 | ret_code = LTTNG_ERR_PROCESS_ATTR_TRACKER_INVALID_TRACKING_POLICY; | |
1665 | break; | |
1666 | case PROCESS_ATTR_TRACKER_STATUS_ERROR: | |
1667 | ret_code = LTTNG_ERR_NOMEM; | |
1668 | break; | |
1669 | default: | |
1670 | ret_code = LTTNG_ERR_UNK; | |
1671 | break; | |
1672 | } | |
1673 | ||
1674 | end: | |
1675 | return ret_code; | |
1676 | } | |
1677 | ||
2f77fc4b DG |
1678 | /* |
1679 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1680 | */ | |
8ddd72ef JR |
1681 | int cmd_disable_event(struct command_ctx *cmd_ctx, |
1682 | struct lttng_event *event, | |
1683 | char *filter_expression, | |
1684 | struct lttng_bytecode *bytecode, | |
1685 | struct lttng_event_exclusion *exclusion) | |
2f77fc4b DG |
1686 | { |
1687 | int ret; | |
df4f5a87 | 1688 | const char *event_name; |
8ddd72ef JR |
1689 | const struct ltt_session *session = cmd_ctx->session; |
1690 | const char *channel_name = cmd_ctx->lsm.u.disable.channel_name; | |
1691 | const enum lttng_domain_type domain = cmd_ctx->lsm.domain.type; | |
6e911cad | 1692 | |
18a720cd MD |
1693 | DBG("Disable event command for event \'%s\'", event->name); |
1694 | ||
8ddd72ef JR |
1695 | /* |
1696 | * Filter and exclusions are simply not handled by the | |
1697 | * disable event command at this time. | |
1698 | * | |
1699 | * FIXME | |
1700 | */ | |
1701 | (void) filter_expression; | |
1702 | (void) exclusion; | |
1703 | ||
1704 | /* Ignore the presence of filter or exclusion for the event */ | |
1705 | event->filter = 0; | |
1706 | event->exclusion = 0; | |
1707 | ||
6e911cad MD |
1708 | event_name = event->name; |
1709 | ||
9b7431cf JG |
1710 | /* Error out on unhandled search criteria */ |
1711 | if (event->loglevel_type || event->loglevel != -1 || event->enabled | |
6e911cad | 1712 | || event->pid || event->filter || event->exclusion) { |
7076b56e JG |
1713 | ret = LTTNG_ERR_UNK; |
1714 | goto error; | |
6e911cad | 1715 | } |
2f77fc4b | 1716 | |
2223c96f DG |
1717 | rcu_read_lock(); |
1718 | ||
2f77fc4b DG |
1719 | switch (domain) { |
1720 | case LTTNG_DOMAIN_KERNEL: | |
1721 | { | |
1722 | struct ltt_kernel_channel *kchan; | |
1723 | struct ltt_kernel_session *ksess; | |
1724 | ||
1725 | ksess = session->kernel_session; | |
1726 | ||
85076754 MD |
1727 | /* |
1728 | * If a non-default channel has been created in the | |
1729 | * session, explicitely require that -c chan_name needs | |
1730 | * to be provided. | |
1731 | */ | |
1732 | if (ksess->has_non_default_channel && channel_name[0] == '\0') { | |
1733 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1734 | goto error_unlock; |
85076754 MD |
1735 | } |
1736 | ||
2f77fc4b DG |
1737 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
1738 | if (kchan == NULL) { | |
f73fabfd | 1739 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
7076b56e | 1740 | goto error_unlock; |
2f77fc4b DG |
1741 | } |
1742 | ||
6e911cad MD |
1743 | switch (event->type) { |
1744 | case LTTNG_EVENT_ALL: | |
9550ee81 | 1745 | case LTTNG_EVENT_TRACEPOINT: |
d0ae4ea8 | 1746 | case LTTNG_EVENT_SYSCALL: |
9550ee81 JR |
1747 | case LTTNG_EVENT_PROBE: |
1748 | case LTTNG_EVENT_FUNCTION: | |
1749 | case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */ | |
1750 | if (event_name[0] == '\0') { | |
1751 | ret = event_kernel_disable_event(kchan, | |
1752 | NULL, event->type); | |
29c62722 | 1753 | } else { |
d0ae4ea8 | 1754 | ret = event_kernel_disable_event(kchan, |
9550ee81 | 1755 | event_name, event->type); |
29c62722 | 1756 | } |
6e911cad | 1757 | if (ret != LTTNG_OK) { |
7076b56e | 1758 | goto error_unlock; |
6e911cad MD |
1759 | } |
1760 | break; | |
6e911cad MD |
1761 | default: |
1762 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1763 | goto error_unlock; |
2f77fc4b DG |
1764 | } |
1765 | ||
7d268848 | 1766 | kernel_wait_quiescent(); |
2f77fc4b DG |
1767 | break; |
1768 | } | |
1769 | case LTTNG_DOMAIN_UST: | |
1770 | { | |
1771 | struct ltt_ust_channel *uchan; | |
1772 | struct ltt_ust_session *usess; | |
1773 | ||
1774 | usess = session->ust_session; | |
1775 | ||
7076b56e JG |
1776 | if (validate_ust_event_name(event_name)) { |
1777 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1778 | goto error_unlock; | |
1779 | } | |
1780 | ||
85076754 MD |
1781 | /* |
1782 | * If a non-default channel has been created in the | |
9550ee81 | 1783 | * session, explicitly require that -c chan_name needs |
85076754 MD |
1784 | * to be provided. |
1785 | */ | |
1786 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1787 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1788 | goto error_unlock; |
85076754 MD |
1789 | } |
1790 | ||
2f77fc4b DG |
1791 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
1792 | channel_name); | |
1793 | if (uchan == NULL) { | |
f73fabfd | 1794 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
7076b56e | 1795 | goto error_unlock; |
2f77fc4b DG |
1796 | } |
1797 | ||
6e911cad MD |
1798 | switch (event->type) { |
1799 | case LTTNG_EVENT_ALL: | |
b3639870 JR |
1800 | /* |
1801 | * An empty event name means that everything | |
1802 | * should be disabled. | |
1803 | */ | |
1804 | if (event->name[0] == '\0') { | |
1805 | ret = event_ust_disable_all_tracepoints(usess, uchan); | |
77d536b2 JR |
1806 | } else { |
1807 | ret = event_ust_disable_tracepoint(usess, uchan, | |
1808 | event_name); | |
1809 | } | |
6e911cad | 1810 | if (ret != LTTNG_OK) { |
7076b56e | 1811 | goto error_unlock; |
6e911cad MD |
1812 | } |
1813 | break; | |
1814 | default: | |
1815 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1816 | goto error_unlock; |
2f77fc4b DG |
1817 | } |
1818 | ||
1819 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
1820 | channel_name); | |
1821 | break; | |
1822 | } | |
5cdb6027 | 1823 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1824 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1825 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1826 | { |
fefd409b | 1827 | struct agent *agt; |
f20baf8e DG |
1828 | struct ltt_ust_session *usess = session->ust_session; |
1829 | ||
a0377dfe | 1830 | LTTNG_ASSERT(usess); |
f20baf8e | 1831 | |
6e911cad MD |
1832 | switch (event->type) { |
1833 | case LTTNG_EVENT_ALL: | |
1834 | break; | |
1835 | default: | |
1836 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1837 | goto error_unlock; |
6e911cad MD |
1838 | } |
1839 | ||
5cdb6027 | 1840 | agt = trace_ust_find_agent(usess, domain); |
fefd409b DG |
1841 | if (!agt) { |
1842 | ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
7076b56e | 1843 | goto error_unlock; |
fefd409b | 1844 | } |
b3639870 JR |
1845 | /* |
1846 | * An empty event name means that everything | |
1847 | * should be disabled. | |
1848 | */ | |
1849 | if (event->name[0] == '\0') { | |
18a720cd MD |
1850 | ret = event_agent_disable_all(usess, agt); |
1851 | } else { | |
1852 | ret = event_agent_disable(usess, agt, event_name); | |
1853 | } | |
f20baf8e | 1854 | if (ret != LTTNG_OK) { |
7076b56e | 1855 | goto error_unlock; |
f20baf8e DG |
1856 | } |
1857 | ||
1858 | break; | |
1859 | } | |
2f77fc4b | 1860 | default: |
f73fabfd | 1861 | ret = LTTNG_ERR_UND; |
7076b56e | 1862 | goto error_unlock; |
2f77fc4b DG |
1863 | } |
1864 | ||
f73fabfd | 1865 | ret = LTTNG_OK; |
2f77fc4b | 1866 | |
7076b56e | 1867 | error_unlock: |
2223c96f | 1868 | rcu_read_unlock(); |
7076b56e | 1869 | error: |
8ddd72ef JR |
1870 | free(exclusion); |
1871 | free(bytecode); | |
1872 | free(filter_expression); | |
2f77fc4b DG |
1873 | return ret; |
1874 | } | |
1875 | ||
2f77fc4b DG |
1876 | /* |
1877 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1878 | */ | |
26e1c61f JR |
1879 | int cmd_add_context(struct command_ctx *cmd_ctx, |
1880 | const struct lttng_event_context *event_context, int kwpipe) | |
2f77fc4b | 1881 | { |
d5979e4a | 1882 | int ret, chan_kern_created = 0, chan_ust_created = 0; |
26e1c61f JR |
1883 | const enum lttng_domain_type domain = cmd_ctx->lsm.domain.type; |
1884 | const struct ltt_session *session = cmd_ctx->session; | |
1885 | const char *channel_name = cmd_ctx->lsm.u.context.channel_name; | |
bdf64013 | 1886 | |
9a699f7b JR |
1887 | /* |
1888 | * Don't try to add a context if the session has been started at | |
1889 | * some point in time before. The tracer does not allow it and would | |
1890 | * result in a corrupted trace. | |
1891 | */ | |
26e1c61f | 1892 | if (cmd_ctx->session->has_been_started) { |
9a699f7b JR |
1893 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
1894 | goto end; | |
1895 | } | |
1896 | ||
2f77fc4b DG |
1897 | switch (domain) { |
1898 | case LTTNG_DOMAIN_KERNEL: | |
a0377dfe | 1899 | LTTNG_ASSERT(session->kernel_session); |
979e618e DG |
1900 | |
1901 | if (session->kernel_session->channel_count == 0) { | |
1902 | /* Create default channel */ | |
1903 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); | |
1904 | if (ret != LTTNG_OK) { | |
1905 | goto error; | |
1906 | } | |
d5979e4a | 1907 | chan_kern_created = 1; |
979e618e | 1908 | } |
2f77fc4b | 1909 | /* Add kernel context to kernel tracer */ |
26e1c61f JR |
1910 | ret = context_kernel_add(session->kernel_session, |
1911 | event_context, channel_name); | |
f73fabfd | 1912 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1913 | goto error; |
1914 | } | |
1915 | break; | |
bdf64013 JG |
1916 | case LTTNG_DOMAIN_JUL: |
1917 | case LTTNG_DOMAIN_LOG4J: | |
1918 | { | |
1919 | /* | |
1920 | * Validate channel name. | |
1921 | * If no channel name is given and the domain is JUL or LOG4J, | |
1922 | * set it to the appropriate domain-specific channel name. If | |
1923 | * a name is provided but does not match the expexted channel | |
1924 | * name, return an error. | |
1925 | */ | |
1926 | if (domain == LTTNG_DOMAIN_JUL && *channel_name && | |
1927 | strcmp(channel_name, | |
1928 | DEFAULT_JUL_CHANNEL_NAME)) { | |
1929 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1930 | goto error; | |
1931 | } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name && | |
1932 | strcmp(channel_name, | |
1933 | DEFAULT_LOG4J_CHANNEL_NAME)) { | |
1934 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1935 | goto error; | |
1936 | } | |
1937 | } | |
30eb3927 | 1938 | /* fall through */ |
2f77fc4b DG |
1939 | case LTTNG_DOMAIN_UST: |
1940 | { | |
1941 | struct ltt_ust_session *usess = session->ust_session; | |
85076754 MD |
1942 | unsigned int chan_count; |
1943 | ||
a0377dfe | 1944 | LTTNG_ASSERT(usess); |
2f77fc4b | 1945 | |
85076754 | 1946 | chan_count = lttng_ht_get_count(usess->domain_global.channels); |
979e618e DG |
1947 | if (chan_count == 0) { |
1948 | struct lttng_channel *attr; | |
1949 | /* Create default channel */ | |
0a9c6494 | 1950 | attr = channel_new_default_attr(domain, usess->buffer_type); |
979e618e DG |
1951 | if (attr == NULL) { |
1952 | ret = LTTNG_ERR_FATAL; | |
1953 | goto error; | |
1954 | } | |
1955 | ||
7972aab2 | 1956 | ret = channel_ust_create(usess, attr, usess->buffer_type); |
979e618e DG |
1957 | if (ret != LTTNG_OK) { |
1958 | free(attr); | |
1959 | goto error; | |
1960 | } | |
cf0bcb51 | 1961 | channel_attr_destroy(attr); |
d5979e4a | 1962 | chan_ust_created = 1; |
979e618e DG |
1963 | } |
1964 | ||
26e1c61f JR |
1965 | ret = context_ust_add(usess, domain, event_context, |
1966 | channel_name); | |
f73fabfd | 1967 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1968 | goto error; |
1969 | } | |
1970 | break; | |
1971 | } | |
2f77fc4b | 1972 | default: |
f73fabfd | 1973 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1974 | goto error; |
1975 | } | |
1976 | ||
bdf64013 JG |
1977 | ret = LTTNG_OK; |
1978 | goto end; | |
2f77fc4b DG |
1979 | |
1980 | error: | |
d5979e4a DG |
1981 | if (chan_kern_created) { |
1982 | struct ltt_kernel_channel *kchan = | |
1983 | trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME, | |
1984 | session->kernel_session); | |
1985 | /* Created previously, this should NOT fail. */ | |
a0377dfe | 1986 | LTTNG_ASSERT(kchan); |
d5979e4a DG |
1987 | kernel_destroy_channel(kchan); |
1988 | } | |
1989 | ||
1990 | if (chan_ust_created) { | |
1991 | struct ltt_ust_channel *uchan = | |
1992 | trace_ust_find_channel_by_name( | |
1993 | session->ust_session->domain_global.channels, | |
1994 | DEFAULT_CHANNEL_NAME); | |
1995 | /* Created previously, this should NOT fail. */ | |
a0377dfe | 1996 | LTTNG_ASSERT(uchan); |
d5979e4a DG |
1997 | /* Remove from the channel list of the session. */ |
1998 | trace_ust_delete_channel(session->ust_session->domain_global.channels, | |
1999 | uchan); | |
2000 | trace_ust_destroy_channel(uchan); | |
2001 | } | |
bdf64013 | 2002 | end: |
2f77fc4b DG |
2003 | return ret; |
2004 | } | |
2005 | ||
dac8e046 JG |
2006 | static inline bool name_starts_with(const char *name, const char *prefix) |
2007 | { | |
7966af57 | 2008 | const size_t max_cmp_len = std::min(strlen(prefix), (size_t) LTTNG_SYMBOL_NAME_LEN); |
dac8e046 JG |
2009 | |
2010 | return !strncmp(name, prefix, max_cmp_len); | |
2011 | } | |
2012 | ||
2013 | /* Perform userspace-specific event name validation */ | |
2014 | static int validate_ust_event_name(const char *name) | |
2015 | { | |
2016 | int ret = 0; | |
2017 | ||
2018 | if (!name) { | |
2019 | ret = -1; | |
2020 | goto end; | |
2021 | } | |
2022 | ||
2023 | /* | |
2024 | * Check name against all internal UST event component namespaces used | |
2025 | * by the agents. | |
2026 | */ | |
2027 | if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) || | |
2028 | name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) || | |
2029 | name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) { | |
2030 | ret = -1; | |
2031 | } | |
2032 | ||
2033 | end: | |
2034 | return ret; | |
2035 | } | |
88f06f15 | 2036 | |
2f77fc4b | 2037 | /* |
88f06f15 JG |
2038 | * Internal version of cmd_enable_event() with a supplemental |
2039 | * "internal_event" flag which is used to enable internal events which should | |
2040 | * be hidden from clients. Such events are used in the agent implementation to | |
2041 | * enable the events through which all "agent" events are funeled. | |
2f77fc4b | 2042 | */ |
88f06f15 | 2043 | static int _cmd_enable_event(struct ltt_session *session, |
df4f5a87 | 2044 | const struct lttng_domain *domain, |
025faf73 | 2045 | char *channel_name, struct lttng_event *event, |
6b453b5e | 2046 | char *filter_expression, |
2b00d462 | 2047 | struct lttng_bytecode *filter, |
db8f1377 | 2048 | struct lttng_event_exclusion *exclusion, |
88f06f15 | 2049 | int wpipe, bool internal_event) |
2f77fc4b | 2050 | { |
9f449915 | 2051 | int ret = 0, channel_created = 0; |
cfedea03 | 2052 | struct lttng_channel *attr = NULL; |
2f77fc4b | 2053 | |
a0377dfe FD |
2054 | LTTNG_ASSERT(session); |
2055 | LTTNG_ASSERT(event); | |
2056 | LTTNG_ASSERT(channel_name); | |
2f77fc4b | 2057 | |
2a385866 | 2058 | /* If we have a filter, we must have its filter expression */ |
a0377dfe | 2059 | LTTNG_ASSERT(!(!!filter_expression ^ !!filter)); |
2a385866 | 2060 | |
9f449915 PP |
2061 | /* Normalize event name as a globbing pattern */ |
2062 | strutils_normalize_star_glob_pattern(event->name); | |
18a720cd | 2063 | |
9f449915 PP |
2064 | /* Normalize exclusion names as globbing patterns */ |
2065 | if (exclusion) { | |
2066 | size_t i; | |
f5ac4bd7 | 2067 | |
9f449915 PP |
2068 | for (i = 0; i < exclusion->count; i++) { |
2069 | char *name = LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i); | |
2070 | ||
2071 | strutils_normalize_star_glob_pattern(name); | |
2072 | } | |
930a2e99 JG |
2073 | } |
2074 | ||
9f449915 PP |
2075 | DBG("Enable event command for event \'%s\'", event->name); |
2076 | ||
2077 | rcu_read_lock(); | |
2078 | ||
7972aab2 | 2079 | switch (domain->type) { |
2f77fc4b DG |
2080 | case LTTNG_DOMAIN_KERNEL: |
2081 | { | |
2082 | struct ltt_kernel_channel *kchan; | |
2083 | ||
85076754 MD |
2084 | /* |
2085 | * If a non-default channel has been created in the | |
2086 | * session, explicitely require that -c chan_name needs | |
2087 | * to be provided. | |
2088 | */ | |
2089 | if (session->kernel_session->has_non_default_channel | |
2090 | && channel_name[0] == '\0') { | |
2091 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
2092 | goto error; | |
2093 | } | |
2094 | ||
2f77fc4b DG |
2095 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2096 | session->kernel_session); | |
2097 | if (kchan == NULL) { | |
0a9c6494 DG |
2098 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
2099 | LTTNG_BUFFER_GLOBAL); | |
2f77fc4b | 2100 | if (attr == NULL) { |
f73fabfd | 2101 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2102 | goto error; |
2103 | } | |
04c17253 MD |
2104 | if (lttng_strncpy(attr->name, channel_name, |
2105 | sizeof(attr->name))) { | |
2106 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
2107 | goto error; |
2108 | } | |
2f77fc4b | 2109 | |
999af9c1 JR |
2110 | ret = cmd_enable_channel_internal( |
2111 | session, domain, attr, wpipe); | |
f73fabfd | 2112 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2113 | goto error; |
2114 | } | |
e5f5db7f | 2115 | channel_created = 1; |
2f77fc4b DG |
2116 | } |
2117 | ||
2118 | /* Get the newly created kernel channel pointer */ | |
2119 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2120 | session->kernel_session); | |
2121 | if (kchan == NULL) { | |
2122 | /* This sould not happen... */ | |
f73fabfd | 2123 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2124 | goto error; |
2125 | } | |
2126 | ||
6e911cad MD |
2127 | switch (event->type) { |
2128 | case LTTNG_EVENT_ALL: | |
29c62722 | 2129 | { |
00a62084 | 2130 | char *filter_expression_a = NULL; |
2b00d462 | 2131 | struct lttng_bytecode *filter_a = NULL; |
00a62084 MD |
2132 | |
2133 | /* | |
2134 | * We need to duplicate filter_expression and filter, | |
2135 | * because ownership is passed to first enable | |
2136 | * event. | |
2137 | */ | |
2138 | if (filter_expression) { | |
2139 | filter_expression_a = strdup(filter_expression); | |
2140 | if (!filter_expression_a) { | |
2141 | ret = LTTNG_ERR_FATAL; | |
2142 | goto error; | |
2143 | } | |
2144 | } | |
2145 | if (filter) { | |
64803277 | 2146 | filter_a = zmalloc<lttng_bytecode>(sizeof(*filter_a) + filter->len); |
00a62084 MD |
2147 | if (!filter_a) { |
2148 | free(filter_expression_a); | |
2149 | ret = LTTNG_ERR_FATAL; | |
2150 | goto error; | |
2151 | } | |
2152 | memcpy(filter_a, filter, sizeof(*filter_a) + filter->len); | |
2153 | } | |
29c62722 | 2154 | event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */ |
00a62084 MD |
2155 | ret = event_kernel_enable_event(kchan, event, |
2156 | filter_expression, filter); | |
a969e101 MD |
2157 | /* We have passed ownership */ |
2158 | filter_expression = NULL; | |
2159 | filter = NULL; | |
29c62722 MD |
2160 | if (ret != LTTNG_OK) { |
2161 | if (channel_created) { | |
2162 | /* Let's not leak a useless channel. */ | |
2163 | kernel_destroy_channel(kchan); | |
2164 | } | |
00a62084 MD |
2165 | free(filter_expression_a); |
2166 | free(filter_a); | |
29c62722 MD |
2167 | goto error; |
2168 | } | |
2169 | event->type = LTTNG_EVENT_SYSCALL; /* Hack */ | |
00a62084 MD |
2170 | ret = event_kernel_enable_event(kchan, event, |
2171 | filter_expression_a, filter_a); | |
60d21fa2 AB |
2172 | /* We have passed ownership */ |
2173 | filter_expression_a = NULL; | |
2174 | filter_a = NULL; | |
29c62722 MD |
2175 | if (ret != LTTNG_OK) { |
2176 | goto error; | |
2177 | } | |
2178 | break; | |
2179 | } | |
6e6ef3d7 | 2180 | case LTTNG_EVENT_PROBE: |
dcabc190 | 2181 | case LTTNG_EVENT_USERSPACE_PROBE: |
6e6ef3d7 DG |
2182 | case LTTNG_EVENT_FUNCTION: |
2183 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
6e911cad | 2184 | case LTTNG_EVENT_TRACEPOINT: |
00a62084 MD |
2185 | ret = event_kernel_enable_event(kchan, event, |
2186 | filter_expression, filter); | |
a969e101 MD |
2187 | /* We have passed ownership */ |
2188 | filter_expression = NULL; | |
2189 | filter = NULL; | |
6e911cad MD |
2190 | if (ret != LTTNG_OK) { |
2191 | if (channel_created) { | |
2192 | /* Let's not leak a useless channel. */ | |
2193 | kernel_destroy_channel(kchan); | |
2194 | } | |
2195 | goto error; | |
e5f5db7f | 2196 | } |
6e911cad MD |
2197 | break; |
2198 | case LTTNG_EVENT_SYSCALL: | |
00a62084 MD |
2199 | ret = event_kernel_enable_event(kchan, event, |
2200 | filter_expression, filter); | |
a969e101 MD |
2201 | /* We have passed ownership */ |
2202 | filter_expression = NULL; | |
2203 | filter = NULL; | |
e2b957af MD |
2204 | if (ret != LTTNG_OK) { |
2205 | goto error; | |
2206 | } | |
6e911cad MD |
2207 | break; |
2208 | default: | |
2209 | ret = LTTNG_ERR_UNK; | |
2f77fc4b DG |
2210 | goto error; |
2211 | } | |
2212 | ||
7d268848 | 2213 | kernel_wait_quiescent(); |
2f77fc4b DG |
2214 | break; |
2215 | } | |
2216 | case LTTNG_DOMAIN_UST: | |
2217 | { | |
2218 | struct ltt_ust_channel *uchan; | |
2219 | struct ltt_ust_session *usess = session->ust_session; | |
2220 | ||
a0377dfe | 2221 | LTTNG_ASSERT(usess); |
2f77fc4b | 2222 | |
85076754 MD |
2223 | /* |
2224 | * If a non-default channel has been created in the | |
2225 | * session, explicitely require that -c chan_name needs | |
2226 | * to be provided. | |
2227 | */ | |
2228 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
2229 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
2230 | goto error; | |
2231 | } | |
2232 | ||
2f77fc4b DG |
2233 | /* Get channel from global UST domain */ |
2234 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2235 | channel_name); | |
2236 | if (uchan == NULL) { | |
2237 | /* Create default channel */ | |
0a9c6494 DG |
2238 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
2239 | usess->buffer_type); | |
2f77fc4b | 2240 | if (attr == NULL) { |
f73fabfd | 2241 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2242 | goto error; |
2243 | } | |
04c17253 MD |
2244 | if (lttng_strncpy(attr->name, channel_name, |
2245 | sizeof(attr->name))) { | |
2246 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
2247 | goto error; |
2248 | } | |
2f77fc4b | 2249 | |
999af9c1 JR |
2250 | ret = cmd_enable_channel_internal( |
2251 | session, domain, attr, wpipe); | |
f73fabfd | 2252 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2253 | goto error; |
2254 | } | |
2f77fc4b DG |
2255 | |
2256 | /* Get the newly created channel reference back */ | |
2257 | uchan = trace_ust_find_channel_by_name( | |
2258 | usess->domain_global.channels, channel_name); | |
a0377dfe | 2259 | LTTNG_ASSERT(uchan); |
2f77fc4b DG |
2260 | } |
2261 | ||
141feb8c JG |
2262 | if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) { |
2263 | /* | |
2264 | * Don't allow users to add UST events to channels which | |
2265 | * are assigned to a userspace subdomain (JUL, Log4J, | |
2266 | * Python, etc.). | |
2267 | */ | |
2268 | ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN; | |
2269 | goto error; | |
2270 | } | |
2271 | ||
dac8e046 JG |
2272 | if (!internal_event) { |
2273 | /* | |
2274 | * Ensure the event name is not reserved for internal | |
2275 | * use. | |
2276 | */ | |
2277 | ret = validate_ust_event_name(event->name); | |
2278 | if (ret) { | |
0e270a1e | 2279 | WARN("Userspace event name %s failed validation.", |
bbcab087 | 2280 | event->name); |
dac8e046 JG |
2281 | ret = LTTNG_ERR_INVALID_EVENT_NAME; |
2282 | goto error; | |
2283 | } | |
2284 | } | |
2285 | ||
2f77fc4b | 2286 | /* At this point, the session and channel exist on the tracer */ |
6b453b5e | 2287 | ret = event_ust_enable_tracepoint(usess, uchan, event, |
88f06f15 JG |
2288 | filter_expression, filter, exclusion, |
2289 | internal_event); | |
49d21f93 MD |
2290 | /* We have passed ownership */ |
2291 | filter_expression = NULL; | |
2292 | filter = NULL; | |
2293 | exclusion = NULL; | |
94382e15 JG |
2294 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2295 | goto already_enabled; | |
2296 | } else if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2297 | goto error; |
2298 | } | |
2299 | break; | |
2300 | } | |
5cdb6027 | 2301 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 2302 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2303 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 2304 | { |
da6c3a50 | 2305 | const char *default_event_name, *default_chan_name; |
fefd409b | 2306 | struct agent *agt; |
f20baf8e DG |
2307 | struct lttng_event uevent; |
2308 | struct lttng_domain tmp_dom; | |
2309 | struct ltt_ust_session *usess = session->ust_session; | |
2310 | ||
a0377dfe | 2311 | LTTNG_ASSERT(usess); |
f20baf8e | 2312 | |
f28f9e44 JG |
2313 | if (!agent_tracing_is_enabled()) { |
2314 | DBG("Attempted to enable an event in an agent domain but the agent thread is not running"); | |
2315 | ret = LTTNG_ERR_AGENT_TRACING_DISABLED; | |
2316 | goto error; | |
2317 | } | |
2318 | ||
5cdb6027 | 2319 | agt = trace_ust_find_agent(usess, domain->type); |
fefd409b | 2320 | if (!agt) { |
5cdb6027 | 2321 | agt = agent_create(domain->type); |
fefd409b | 2322 | if (!agt) { |
e5b3c48c | 2323 | ret = LTTNG_ERR_NOMEM; |
fefd409b DG |
2324 | goto error; |
2325 | } | |
2326 | agent_add(agt, usess->agents); | |
2327 | } | |
2328 | ||
022d91ba | 2329 | /* Create the default tracepoint. */ |
996de3c7 | 2330 | memset(&uevent, 0, sizeof(uevent)); |
f20baf8e DG |
2331 | uevent.type = LTTNG_EVENT_TRACEPOINT; |
2332 | uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
51755dc8 JG |
2333 | default_event_name = event_get_default_agent_ust_name( |
2334 | domain->type); | |
da6c3a50 | 2335 | if (!default_event_name) { |
e5b3c48c | 2336 | ret = LTTNG_ERR_FATAL; |
da6c3a50 | 2337 | goto error; |
f43f95a9 | 2338 | } |
da6c3a50 | 2339 | strncpy(uevent.name, default_event_name, sizeof(uevent.name)); |
f20baf8e DG |
2340 | uevent.name[sizeof(uevent.name) - 1] = '\0'; |
2341 | ||
2342 | /* | |
2343 | * The domain type is changed because we are about to enable the | |
2344 | * default channel and event for the JUL domain that are hardcoded. | |
2345 | * This happens in the UST domain. | |
2346 | */ | |
2347 | memcpy(&tmp_dom, domain, sizeof(tmp_dom)); | |
2348 | tmp_dom.type = LTTNG_DOMAIN_UST; | |
2349 | ||
0e115563 DG |
2350 | switch (domain->type) { |
2351 | case LTTNG_DOMAIN_LOG4J: | |
da6c3a50 | 2352 | default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME; |
0e115563 DG |
2353 | break; |
2354 | case LTTNG_DOMAIN_JUL: | |
da6c3a50 | 2355 | default_chan_name = DEFAULT_JUL_CHANNEL_NAME; |
0e115563 DG |
2356 | break; |
2357 | case LTTNG_DOMAIN_PYTHON: | |
2358 | default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
2359 | break; | |
2360 | default: | |
e98a44b0 | 2361 | /* The switch/case we are in makes this impossible */ |
a0377dfe | 2362 | abort(); |
da6c3a50 DG |
2363 | } |
2364 | ||
971da06a | 2365 | { |
8404118c | 2366 | char *filter_expression_copy = NULL; |
2b00d462 | 2367 | struct lttng_bytecode *filter_copy = NULL; |
971da06a JG |
2368 | |
2369 | if (filter) { | |
51755dc8 | 2370 | const size_t filter_size = sizeof( |
2b00d462 | 2371 | struct lttng_bytecode) |
51755dc8 JG |
2372 | + filter->len; |
2373 | ||
64803277 | 2374 | filter_copy = zmalloc<lttng_bytecode>(filter_size); |
971da06a | 2375 | if (!filter_copy) { |
018096a4 | 2376 | ret = LTTNG_ERR_NOMEM; |
b742e3e2 | 2377 | goto error; |
971da06a | 2378 | } |
51755dc8 | 2379 | memcpy(filter_copy, filter, filter_size); |
971da06a | 2380 | |
8404118c JG |
2381 | filter_expression_copy = |
2382 | strdup(filter_expression); | |
2383 | if (!filter_expression) { | |
2384 | ret = LTTNG_ERR_NOMEM; | |
51755dc8 JG |
2385 | } |
2386 | ||
2387 | if (!filter_expression_copy || !filter_copy) { | |
2388 | free(filter_expression_copy); | |
2389 | free(filter_copy); | |
2390 | goto error; | |
8404118c | 2391 | } |
971da06a JG |
2392 | } |
2393 | ||
88f06f15 | 2394 | ret = cmd_enable_event_internal(session, &tmp_dom, |
971da06a | 2395 | (char *) default_chan_name, |
8404118c JG |
2396 | &uevent, filter_expression_copy, |
2397 | filter_copy, NULL, wpipe); | |
971da06a JG |
2398 | } |
2399 | ||
94382e15 JG |
2400 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2401 | goto already_enabled; | |
2402 | } else if (ret != LTTNG_OK) { | |
f20baf8e DG |
2403 | goto error; |
2404 | } | |
2405 | ||
2406 | /* The wild card * means that everything should be enabled. */ | |
2407 | if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) { | |
8404118c JG |
2408 | ret = event_agent_enable_all(usess, agt, event, filter, |
2409 | filter_expression); | |
f20baf8e | 2410 | } else { |
8404118c JG |
2411 | ret = event_agent_enable(usess, agt, event, filter, |
2412 | filter_expression); | |
f20baf8e | 2413 | } |
51755dc8 JG |
2414 | filter = NULL; |
2415 | filter_expression = NULL; | |
f20baf8e DG |
2416 | if (ret != LTTNG_OK) { |
2417 | goto error; | |
2418 | } | |
2419 | ||
2420 | break; | |
2421 | } | |
2f77fc4b | 2422 | default: |
f73fabfd | 2423 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2424 | goto error; |
2425 | } | |
2426 | ||
f73fabfd | 2427 | ret = LTTNG_OK; |
2f77fc4b | 2428 | |
94382e15 | 2429 | already_enabled: |
2f77fc4b | 2430 | error: |
49d21f93 MD |
2431 | free(filter_expression); |
2432 | free(filter); | |
2433 | free(exclusion); | |
cf0bcb51 | 2434 | channel_attr_destroy(attr); |
2223c96f | 2435 | rcu_read_unlock(); |
2f77fc4b DG |
2436 | return ret; |
2437 | } | |
2438 | ||
88f06f15 JG |
2439 | /* |
2440 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2441 | * We own filter, exclusion, and filter_expression. | |
2442 | */ | |
8ddd72ef JR |
2443 | int cmd_enable_event(struct command_ctx *cmd_ctx, |
2444 | struct lttng_event *event, | |
88f06f15 | 2445 | char *filter_expression, |
88f06f15 | 2446 | struct lttng_event_exclusion *exclusion, |
8ddd72ef | 2447 | struct lttng_bytecode *bytecode, |
88f06f15 JG |
2448 | int wpipe) |
2449 | { | |
8ddd72ef JR |
2450 | int ret; |
2451 | /* | |
2452 | * Copied to ensure proper alignment since 'lsm' is a packed structure. | |
2453 | */ | |
2454 | const lttng_domain command_domain = cmd_ctx->lsm.domain; | |
2455 | ||
2456 | /* | |
2457 | * The ownership of the following parameters is transferred to | |
2458 | * _cmd_enable_event: | |
2459 | * | |
2460 | * - filter_expression, | |
2461 | * - bytecode, | |
2462 | * - exclusion | |
2463 | */ | |
2464 | ret = _cmd_enable_event(cmd_ctx->session, | |
2465 | &command_domain, | |
2466 | cmd_ctx->lsm.u.enable.channel_name, event, | |
2467 | filter_expression, bytecode, exclusion, wpipe, false); | |
2468 | filter_expression = NULL; | |
2469 | bytecode = NULL; | |
2470 | exclusion = NULL; | |
2471 | return ret; | |
88f06f15 JG |
2472 | } |
2473 | ||
2474 | /* | |
2475 | * Enable an event which is internal to LTTng. An internal should | |
2476 | * never be made visible to clients and are immune to checks such as | |
2477 | * reserved names. | |
2478 | */ | |
2479 | static int cmd_enable_event_internal(struct ltt_session *session, | |
df4f5a87 | 2480 | const struct lttng_domain *domain, |
88f06f15 JG |
2481 | char *channel_name, struct lttng_event *event, |
2482 | char *filter_expression, | |
2b00d462 | 2483 | struct lttng_bytecode *filter, |
88f06f15 JG |
2484 | struct lttng_event_exclusion *exclusion, |
2485 | int wpipe) | |
2486 | { | |
2487 | return _cmd_enable_event(session, domain, channel_name, event, | |
2488 | filter_expression, filter, exclusion, wpipe, true); | |
2489 | } | |
2490 | ||
2f77fc4b DG |
2491 | /* |
2492 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2493 | */ | |
8ddd72ef JR |
2494 | enum lttng_error_code cmd_list_tracepoints(enum lttng_domain_type domain, |
2495 | struct lttng_payload *reply_payload) | |
2f77fc4b | 2496 | { |
8ddd72ef | 2497 | enum lttng_error_code ret_code; |
2f77fc4b | 2498 | int ret; |
8ddd72ef JR |
2499 | ssize_t i, nb_events = 0; |
2500 | struct lttng_event *events = NULL; | |
2501 | struct lttcomm_list_command_header reply_command_header = {}; | |
2502 | size_t reply_command_header_offset; | |
2503 | ||
2504 | assert(reply_payload); | |
2505 | ||
2506 | /* Reserve space for command reply header. */ | |
2507 | reply_command_header_offset = reply_payload->buffer.size; | |
2508 | ret = lttng_dynamic_buffer_set_size(&reply_payload->buffer, | |
2509 | reply_command_header_offset + | |
2510 | sizeof(struct lttcomm_list_command_header)); | |
2511 | if (ret) { | |
2512 | ret_code = LTTNG_ERR_NOMEM; | |
2513 | goto error; | |
2514 | } | |
2f77fc4b DG |
2515 | |
2516 | switch (domain) { | |
2517 | case LTTNG_DOMAIN_KERNEL: | |
8ddd72ef | 2518 | nb_events = kernel_list_events(&events); |
2f77fc4b | 2519 | if (nb_events < 0) { |
8ddd72ef | 2520 | ret_code = LTTNG_ERR_KERN_LIST_FAIL; |
2f77fc4b DG |
2521 | goto error; |
2522 | } | |
2523 | break; | |
2524 | case LTTNG_DOMAIN_UST: | |
8ddd72ef | 2525 | nb_events = ust_app_list_events(&events); |
2f77fc4b | 2526 | if (nb_events < 0) { |
8ddd72ef | 2527 | ret_code = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2528 | goto error; |
2529 | } | |
2530 | break; | |
5cdb6027 | 2531 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2532 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2533 | case LTTNG_DOMAIN_PYTHON: |
8ddd72ef | 2534 | nb_events = agent_list_events(&events, domain); |
3c6a091f | 2535 | if (nb_events < 0) { |
8ddd72ef | 2536 | ret_code = LTTNG_ERR_UST_LIST_FAIL; |
3c6a091f DG |
2537 | goto error; |
2538 | } | |
2539 | break; | |
2f77fc4b | 2540 | default: |
8ddd72ef JR |
2541 | ret_code = LTTNG_ERR_UND; |
2542 | goto error; | |
2543 | } | |
2544 | ||
2545 | for (i = 0; i < nb_events; i++) { | |
2546 | ret = lttng_event_serialize(&events[i], 0, NULL, NULL, 0, NULL, | |
2547 | reply_payload); | |
2548 | if (ret) { | |
2549 | ret_code = LTTNG_ERR_NOMEM; | |
2550 | goto error; | |
2551 | } | |
2552 | } | |
2553 | ||
2554 | if (nb_events > UINT32_MAX) { | |
2555 | ERR("Tracepoint count would overflow the tracepoint listing command's reply"); | |
2556 | ret_code = LTTNG_ERR_OVERFLOW; | |
2f77fc4b DG |
2557 | goto error; |
2558 | } | |
2559 | ||
8ddd72ef JR |
2560 | /* Update command reply header. */ |
2561 | reply_command_header.count = (uint32_t) nb_events; | |
2562 | memcpy(reply_payload->buffer.data + reply_command_header_offset, &reply_command_header, | |
2563 | sizeof(reply_command_header)); | |
2f77fc4b | 2564 | |
8ddd72ef | 2565 | ret_code = LTTNG_OK; |
2f77fc4b | 2566 | error: |
8ddd72ef JR |
2567 | free(events); |
2568 | return ret_code; | |
2f77fc4b DG |
2569 | } |
2570 | ||
2571 | /* | |
2572 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
2573 | */ | |
b2d68839 JR |
2574 | enum lttng_error_code cmd_list_tracepoint_fields(enum lttng_domain_type domain, |
2575 | struct lttng_payload *reply) | |
2f77fc4b | 2576 | { |
b2d68839 | 2577 | enum lttng_error_code ret_code; |
2f77fc4b | 2578 | int ret; |
b2d68839 JR |
2579 | unsigned int i, nb_fields; |
2580 | struct lttng_event_field *fields = NULL; | |
2581 | struct lttcomm_list_command_header reply_command_header = {}; | |
2582 | size_t reply_command_header_offset; | |
2583 | ||
2584 | assert(reply); | |
2585 | ||
2586 | /* Reserve space for command reply header. */ | |
2587 | reply_command_header_offset = reply->buffer.size; | |
2588 | ret = lttng_dynamic_buffer_set_size(&reply->buffer, | |
2589 | reply_command_header_offset + | |
2590 | sizeof(struct lttcomm_list_command_header)); | |
2591 | if (ret) { | |
2592 | ret_code = LTTNG_ERR_NOMEM; | |
2593 | goto error; | |
2594 | } | |
2f77fc4b DG |
2595 | |
2596 | switch (domain) { | |
2597 | case LTTNG_DOMAIN_UST: | |
b2d68839 JR |
2598 | ret = ust_app_list_event_fields(&fields); |
2599 | if (ret < 0) { | |
2600 | ret_code = LTTNG_ERR_UST_LIST_FAIL; | |
2f77fc4b DG |
2601 | goto error; |
2602 | } | |
b2d68839 | 2603 | |
2f77fc4b DG |
2604 | break; |
2605 | case LTTNG_DOMAIN_KERNEL: | |
2606 | default: /* fall-through */ | |
b2d68839 | 2607 | ret_code = LTTNG_ERR_UND; |
2f77fc4b DG |
2608 | goto error; |
2609 | } | |
2610 | ||
b2d68839 JR |
2611 | nb_fields = ret; |
2612 | ||
2613 | for (i = 0; i < nb_fields; i++) { | |
2614 | ret = lttng_event_field_serialize(&fields[i], reply); | |
2615 | if (ret) { | |
2616 | ret_code = LTTNG_ERR_NOMEM; | |
2617 | goto error; | |
2618 | } | |
2619 | } | |
2620 | ||
2621 | if (nb_fields > UINT32_MAX) { | |
2622 | ERR("Tracepoint field count would overflow the tracepoint field listing command's reply"); | |
2623 | ret_code = LTTNG_ERR_OVERFLOW; | |
2624 | goto error; | |
2625 | } | |
2626 | ||
2627 | /* Update command reply header. */ | |
2628 | reply_command_header.count = (uint32_t) nb_fields; | |
2629 | ||
2630 | memcpy(reply->buffer.data + reply_command_header_offset, &reply_command_header, | |
2631 | sizeof(reply_command_header)); | |
2632 | ||
2633 | ret_code = LTTNG_OK; | |
2f77fc4b DG |
2634 | |
2635 | error: | |
b2d68839 JR |
2636 | free(fields); |
2637 | return ret_code; | |
2f77fc4b DG |
2638 | } |
2639 | ||
8ddd72ef JR |
2640 | enum lttng_error_code cmd_list_syscalls( |
2641 | struct lttng_payload *reply_payload) | |
834978fd | 2642 | { |
8ddd72ef JR |
2643 | enum lttng_error_code ret_code; |
2644 | ssize_t nb_events, i; | |
2645 | int ret; | |
2646 | struct lttng_event *events = NULL; | |
2647 | struct lttcomm_list_command_header reply_command_header = {}; | |
2648 | size_t reply_command_header_offset; | |
2649 | ||
2650 | assert(reply_payload); | |
2651 | ||
2652 | /* Reserve space for command reply header. */ | |
2653 | reply_command_header_offset = reply_payload->buffer.size; | |
2654 | ret = lttng_dynamic_buffer_set_size(&reply_payload->buffer, | |
2655 | reply_command_header_offset + | |
2656 | sizeof(struct lttcomm_list_command_header)); | |
2657 | if (ret) { | |
2658 | ret_code = LTTNG_ERR_NOMEM; | |
2659 | goto end; | |
2660 | } | |
2661 | ||
2662 | nb_events = syscall_table_list(&events); | |
2663 | if (nb_events < 0) { | |
2664 | ret_code = (enum lttng_error_code) -nb_events; | |
2665 | goto end; | |
2666 | } | |
2667 | ||
2668 | for (i = 0; i < nb_events; i++) { | |
2669 | ret = lttng_event_serialize(&events[i], 0, NULL, NULL, 0, NULL, | |
2670 | reply_payload); | |
2671 | if (ret) { | |
2672 | ret_code = LTTNG_ERR_NOMEM; | |
2673 | goto end; | |
2674 | } | |
2675 | } | |
2676 | ||
2677 | if (nb_events > UINT32_MAX) { | |
2678 | ERR("Syscall count would overflow the syscall listing command's reply"); | |
2679 | ret_code = LTTNG_ERR_OVERFLOW; | |
2680 | goto end; | |
2681 | } | |
2682 | ||
2683 | /* Update command reply header. */ | |
2684 | reply_command_header.count = (uint32_t) nb_events; | |
2685 | memcpy(reply_payload->buffer.data + reply_command_header_offset, &reply_command_header, | |
2686 | sizeof(reply_command_header)); | |
2687 | ||
2688 | ret_code = LTTNG_OK; | |
2689 | end: | |
2690 | free(events); | |
2691 | return ret_code; | |
834978fd DG |
2692 | } |
2693 | ||
2f77fc4b DG |
2694 | /* |
2695 | * Command LTTNG_START_TRACE processed by the client thread. | |
a9ad0c8f MD |
2696 | * |
2697 | * Called with session mutex held. | |
2f77fc4b DG |
2698 | */ |
2699 | int cmd_start_trace(struct ltt_session *session) | |
2700 | { | |
82b69413 | 2701 | enum lttng_error_code ret; |
cde3e505 | 2702 | unsigned long nb_chan = 0; |
2f77fc4b DG |
2703 | struct ltt_kernel_session *ksession; |
2704 | struct ltt_ust_session *usess; | |
1f496244 JG |
2705 | const bool session_rotated_after_last_stop = |
2706 | session->rotated_after_last_stop; | |
b02f5986 MD |
2707 | const bool session_cleared_after_last_stop = |
2708 | session->cleared_after_last_stop; | |
2f77fc4b | 2709 | |
a0377dfe | 2710 | LTTNG_ASSERT(session); |
2f77fc4b DG |
2711 | |
2712 | /* Ease our life a bit ;) */ | |
2713 | ksession = session->kernel_session; | |
2714 | usess = session->ust_session; | |
2715 | ||
8382cf6f DG |
2716 | /* Is the session already started? */ |
2717 | if (session->active) { | |
f73fabfd | 2718 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
7a24ece3 JR |
2719 | /* Perform nothing */ |
2720 | goto end; | |
2f77fc4b DG |
2721 | } |
2722 | ||
1f496244 JG |
2723 | if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING && |
2724 | !session->current_trace_chunk) { | |
2725 | /* | |
2726 | * A rotation was launched while the session was stopped and | |
2727 | * it has not been completed yet. It is not possible to start | |
2728 | * the session since starting the session here would require a | |
2729 | * rotation from "NULL" to a new trace chunk. That rotation | |
2730 | * would overlap with the ongoing rotation, which is not | |
2731 | * supported. | |
2732 | */ | |
2733 | WARN("Refusing to start session \"%s\" as a rotation launched after the last \"stop\" is still ongoing", | |
2734 | session->name); | |
2735 | ret = LTTNG_ERR_ROTATION_PENDING; | |
2736 | goto error; | |
2737 | } | |
2738 | ||
cde3e505 DG |
2739 | /* |
2740 | * Starting a session without channel is useless since after that it's not | |
2741 | * possible to enable channel thus inform the client. | |
2742 | */ | |
2743 | if (usess && usess->domain_global.channels) { | |
2744 | nb_chan += lttng_ht_get_count(usess->domain_global.channels); | |
2745 | } | |
2746 | if (ksession) { | |
2747 | nb_chan += ksession->channel_count; | |
2748 | } | |
2749 | if (!nb_chan) { | |
2750 | ret = LTTNG_ERR_NO_CHANNEL; | |
2751 | goto error; | |
2752 | } | |
2753 | ||
1f496244 JG |
2754 | session->active = 1; |
2755 | session->rotated_after_last_stop = false; | |
b02f5986 | 2756 | session->cleared_after_last_stop = false; |
070b6a86 | 2757 | if (session->output_traces && !session->current_trace_chunk) { |
1f496244 JG |
2758 | if (!session->has_been_started) { |
2759 | struct lttng_trace_chunk *trace_chunk; | |
2760 | ||
2761 | DBG("Creating initial trace chunk of session \"%s\"", | |
2762 | session->name); | |
2763 | trace_chunk = session_create_new_trace_chunk( | |
2764 | session, NULL, NULL, NULL); | |
2765 | if (!trace_chunk) { | |
2766 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
2767 | goto error; | |
2768 | } | |
a0377dfe | 2769 | LTTNG_ASSERT(!session->current_trace_chunk); |
7966af57 | 2770 | ret = (lttng_error_code) session_set_trace_chunk(session, trace_chunk, |
1f496244 JG |
2771 | NULL); |
2772 | lttng_trace_chunk_put(trace_chunk); | |
2773 | if (ret) { | |
2774 | ret = LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER; | |
2775 | goto error; | |
2776 | } | |
2777 | } else { | |
2778 | DBG("Rotating session \"%s\" from its current \"NULL\" trace chunk to a new chunk", | |
2779 | session->name); | |
2780 | /* | |
2781 | * Rotate existing streams into the new chunk. | |
2782 | * This is a "quiet" rotation has no client has | |
2783 | * explicitly requested this operation. | |
2784 | * | |
2785 | * There is also no need to wait for the rotation | |
2786 | * to complete as it will happen immediately. No data | |
2787 | * was produced as the session was stopped, so the | |
2788 | * rotation should happen on reception of the command. | |
2789 | */ | |
7966af57 | 2790 | ret = (lttng_error_code) cmd_rotate_session(session, NULL, true, |
343defc2 | 2791 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION); |
1f496244 JG |
2792 | if (ret != LTTNG_OK) { |
2793 | goto error; | |
2794 | } | |
5c408ad8 | 2795 | } |
c996624c JD |
2796 | } |
2797 | ||
2f77fc4b DG |
2798 | /* Kernel tracing */ |
2799 | if (ksession != NULL) { | |
c996624c | 2800 | DBG("Start kernel tracing session %s", session->name); |
7966af57 | 2801 | ret = (lttng_error_code) start_kernel_session(ksession); |
9b6c7ec5 | 2802 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2803 | goto error; |
2804 | } | |
2f77fc4b DG |
2805 | } |
2806 | ||
2807 | /* Flag session that trace should start automatically */ | |
2808 | if (usess) { | |
82b69413 JG |
2809 | int int_ret = ust_app_start_trace_all(usess); |
2810 | ||
2811 | if (int_ret < 0) { | |
f73fabfd | 2812 | ret = LTTNG_ERR_UST_START_FAIL; |
2f77fc4b DG |
2813 | goto error; |
2814 | } | |
2815 | } | |
2816 | ||
04ed9e10 JG |
2817 | /* |
2818 | * Open a packet in every stream of the session to ensure that viewers | |
2819 | * can correctly identify the boundaries of the periods during which | |
2820 | * tracing was active for this session. | |
2821 | */ | |
2822 | ret = session_open_packets(session); | |
2823 | if (ret != LTTNG_OK) { | |
2824 | goto error; | |
2825 | } | |
2826 | ||
5c408ad8 JD |
2827 | /* |
2828 | * Clear the flag that indicates that a rotation was done while the | |
2829 | * session was stopped. | |
2830 | */ | |
2831 | session->rotated_after_last_stop = false; | |
2832 | ||
355cf1bd | 2833 | if (session->rotate_timer_period && !session->rotation_schedule_timer_enabled) { |
82b69413 JG |
2834 | int int_ret = timer_session_rotation_schedule_timer_start( |
2835 | session, session->rotate_timer_period); | |
2836 | ||
2837 | if (int_ret < 0) { | |
259c2674 JD |
2838 | ERR("Failed to enable rotate timer"); |
2839 | ret = LTTNG_ERR_UNK; | |
2840 | goto error; | |
2841 | } | |
2842 | } | |
2843 | ||
f73fabfd | 2844 | ret = LTTNG_OK; |
2f77fc4b DG |
2845 | |
2846 | error: | |
1f496244 JG |
2847 | if (ret == LTTNG_OK) { |
2848 | /* Flag this after a successful start. */ | |
2849 | session->has_been_started |= 1; | |
2850 | } else { | |
2851 | session->active = 0; | |
2852 | /* Restore initial state on error. */ | |
2853 | session->rotated_after_last_stop = | |
2854 | session_rotated_after_last_stop; | |
b02f5986 MD |
2855 | session->cleared_after_last_stop = |
2856 | session_cleared_after_last_stop; | |
1f496244 | 2857 | } |
7a24ece3 | 2858 | end: |
2f77fc4b DG |
2859 | return ret; |
2860 | } | |
2861 | ||
2862 | /* | |
2863 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2864 | */ | |
2865 | int cmd_stop_trace(struct ltt_session *session) | |
2866 | { | |
2867 | int ret; | |
2f77fc4b DG |
2868 | struct ltt_kernel_session *ksession; |
2869 | struct ltt_ust_session *usess; | |
2870 | ||
a0377dfe | 2871 | LTTNG_ASSERT(session); |
2f77fc4b | 2872 | |
4dbe1875 | 2873 | DBG("Begin stop session \"%s\" (id %" PRIu64 ")", session->name, session->id); |
2f77fc4b DG |
2874 | /* Short cut */ |
2875 | ksession = session->kernel_session; | |
2876 | usess = session->ust_session; | |
2877 | ||
40afd77d | 2878 | /* Session is not active. Skip everything and inform the client. */ |
8382cf6f | 2879 | if (!session->active) { |
f73fabfd | 2880 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
2f77fc4b DG |
2881 | goto error; |
2882 | } | |
2883 | ||
4dbe1875 MD |
2884 | ret = stop_kernel_session(ksession); |
2885 | if (ret != LTTNG_OK) { | |
2886 | goto error; | |
2f77fc4b DG |
2887 | } |
2888 | ||
14fb1ebe | 2889 | if (usess && usess->active) { |
2f77fc4b DG |
2890 | ret = ust_app_stop_trace_all(usess); |
2891 | if (ret < 0) { | |
f73fabfd | 2892 | ret = LTTNG_ERR_UST_STOP_FAIL; |
2f77fc4b DG |
2893 | goto error; |
2894 | } | |
2895 | } | |
2896 | ||
4dbe1875 MD |
2897 | DBG("Completed stop session \"%s\" (id %" PRIu64 ")", session->name, |
2898 | session->id); | |
8382cf6f DG |
2899 | /* Flag inactive after a successful stop. */ |
2900 | session->active = 0; | |
4dbe1875 | 2901 | ret = LTTNG_OK; |
2f77fc4b DG |
2902 | |
2903 | error: | |
2904 | return ret; | |
2905 | } | |
2906 | ||
2907 | /* | |
433f5ba9 JR |
2908 | * Set the base_path of the session only if subdir of a control uris is set. |
2909 | * Return LTTNG_OK on success, otherwise LTTNG_ERR_*. | |
2f77fc4b | 2910 | */ |
433f5ba9 JR |
2911 | static int set_session_base_path_from_uris(struct ltt_session *session, |
2912 | size_t nb_uri, | |
bda32d56 | 2913 | struct lttng_uri *uris) |
2f77fc4b | 2914 | { |
433f5ba9 JR |
2915 | int ret; |
2916 | size_t i; | |
2f77fc4b | 2917 | |
e3876bf0 JR |
2918 | for (i = 0; i < nb_uri; i++) { |
2919 | if (uris[i].stype != LTTNG_STREAM_CONTROL || | |
2920 | uris[i].subdir[0] == '\0') { | |
2921 | /* Not interested in these URIs */ | |
2922 | continue; | |
2923 | } | |
2924 | ||
2925 | if (session->base_path != NULL) { | |
2926 | free(session->base_path); | |
2927 | session->base_path = NULL; | |
2928 | } | |
2929 | ||
2930 | /* Set session base_path */ | |
2931 | session->base_path = strdup(uris[i].subdir); | |
2932 | if (!session->base_path) { | |
433f5ba9 JR |
2933 | PERROR("Failed to copy base path \"%s\" to session \"%s\"", |
2934 | uris[i].subdir, session->name); | |
2935 | ret = LTTNG_ERR_NOMEM; | |
e3876bf0 JR |
2936 | goto error; |
2937 | } | |
433f5ba9 JR |
2938 | DBG2("Setting base path \"%s\" for session \"%s\"", |
2939 | session->base_path, session->name); | |
2940 | } | |
2941 | ret = LTTNG_OK; | |
2942 | error: | |
2943 | return ret; | |
2944 | } | |
2945 | ||
2946 | /* | |
2947 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
2948 | */ | |
2949 | int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri, | |
2950 | struct lttng_uri *uris) | |
2951 | { | |
2952 | int ret, i; | |
2953 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2954 | struct ltt_ust_session *usess = session->ust_session; | |
2955 | ||
a0377dfe FD |
2956 | LTTNG_ASSERT(session); |
2957 | LTTNG_ASSERT(uris); | |
2958 | LTTNG_ASSERT(nb_uri > 0); | |
433f5ba9 JR |
2959 | |
2960 | /* Can't set consumer URI if the session is active. */ | |
2961 | if (session->active) { | |
2962 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; | |
2963 | goto error; | |
2964 | } | |
2965 | ||
2966 | /* | |
2967 | * Set the session base path if any. This is done inside | |
2968 | * cmd_set_consumer_uri to preserve backward compatibility of the | |
2969 | * previous session creation api vs the session descriptor api. | |
2970 | */ | |
2971 | ret = set_session_base_path_from_uris(session, nb_uri, uris); | |
2972 | if (ret != LTTNG_OK) { | |
2973 | goto error; | |
e3876bf0 JR |
2974 | } |
2975 | ||
bda32d56 | 2976 | /* Set the "global" consumer URIs */ |
2f77fc4b | 2977 | for (i = 0; i < nb_uri; i++) { |
e3876bf0 JR |
2978 | ret = add_uri_to_consumer(session, session->consumer, &uris[i], |
2979 | LTTNG_DOMAIN_NONE); | |
a74934ba | 2980 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2981 | goto error; |
2982 | } | |
2f77fc4b DG |
2983 | } |
2984 | ||
bda32d56 JG |
2985 | /* Set UST session URIs */ |
2986 | if (session->ust_session) { | |
2987 | for (i = 0; i < nb_uri; i++) { | |
b178f53e | 2988 | ret = add_uri_to_consumer(session, |
bda32d56 | 2989 | session->ust_session->consumer, |
b178f53e | 2990 | &uris[i], LTTNG_DOMAIN_UST); |
bda32d56 JG |
2991 | if (ret != LTTNG_OK) { |
2992 | goto error; | |
2993 | } | |
2994 | } | |
2995 | } | |
2996 | ||
2997 | /* Set kernel session URIs */ | |
2998 | if (session->kernel_session) { | |
2999 | for (i = 0; i < nb_uri; i++) { | |
b178f53e | 3000 | ret = add_uri_to_consumer(session, |
bda32d56 | 3001 | session->kernel_session->consumer, |
b178f53e | 3002 | &uris[i], LTTNG_DOMAIN_KERNEL); |
bda32d56 JG |
3003 | if (ret != LTTNG_OK) { |
3004 | goto error; | |
3005 | } | |
3006 | } | |
3007 | } | |
3008 | ||
7ab70fe0 DG |
3009 | /* |
3010 | * Make sure to set the session in output mode after we set URI since a | |
3011 | * session can be created without URL (thus flagged in no output mode). | |
3012 | */ | |
3013 | session->output_traces = 1; | |
3014 | if (ksess) { | |
3015 | ksess->output_traces = 1; | |
bda32d56 JG |
3016 | } |
3017 | ||
3018 | if (usess) { | |
7ab70fe0 DG |
3019 | usess->output_traces = 1; |
3020 | } | |
3021 | ||
2f77fc4b | 3022 | /* All good! */ |
f73fabfd | 3023 | ret = LTTNG_OK; |
2f77fc4b DG |
3024 | |
3025 | error: | |
3026 | return ret; | |
3027 | } | |
3028 | ||
b178f53e JG |
3029 | static |
3030 | enum lttng_error_code set_session_output_from_descriptor( | |
3031 | struct ltt_session *session, | |
3032 | const struct lttng_session_descriptor *descriptor) | |
2f77fc4b DG |
3033 | { |
3034 | int ret; | |
b178f53e JG |
3035 | enum lttng_error_code ret_code = LTTNG_OK; |
3036 | enum lttng_session_descriptor_type session_type = | |
3037 | lttng_session_descriptor_get_type(descriptor); | |
3038 | enum lttng_session_descriptor_output_type output_type = | |
3039 | lttng_session_descriptor_get_output_type(descriptor); | |
3040 | struct lttng_uri uris[2] = {}; | |
3041 | size_t uri_count = 0; | |
3042 | ||
3043 | switch (output_type) { | |
3044 | case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NONE: | |
3045 | goto end; | |
3046 | case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_LOCAL: | |
3047 | lttng_session_descriptor_get_local_output_uri(descriptor, | |
3048 | &uris[0]); | |
3049 | uri_count = 1; | |
3050 | break; | |
3051 | case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NETWORK: | |
3052 | lttng_session_descriptor_get_network_output_uris(descriptor, | |
3053 | &uris[0], &uris[1]); | |
3054 | uri_count = 2; | |
3055 | break; | |
3056 | default: | |
3057 | ret_code = LTTNG_ERR_INVALID; | |
e32d7f27 | 3058 | goto end; |
2f77fc4b DG |
3059 | } |
3060 | ||
b178f53e JG |
3061 | switch (session_type) { |
3062 | case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT: | |
3063 | { | |
3064 | struct snapshot_output *new_output = NULL; | |
3065 | ||
3066 | new_output = snapshot_output_alloc(); | |
3067 | if (!new_output) { | |
3068 | ret_code = LTTNG_ERR_NOMEM; | |
3069 | goto end; | |
3070 | } | |
3071 | ||
3072 | ret = snapshot_output_init_with_uri(session, | |
3073 | DEFAULT_SNAPSHOT_MAX_SIZE, | |
3074 | NULL, uris, uri_count, session->consumer, | |
3075 | new_output, &session->snapshot); | |
3076 | if (ret < 0) { | |
3077 | ret_code = (ret == -ENOMEM) ? | |
3078 | LTTNG_ERR_NOMEM : LTTNG_ERR_INVALID; | |
3079 | snapshot_output_destroy(new_output); | |
3080 | goto end; | |
3081 | } | |
3082 | snapshot_add_output(&session->snapshot, new_output); | |
3083 | break; | |
3084 | } | |
3085 | case LTTNG_SESSION_DESCRIPTOR_TYPE_REGULAR: | |
3086 | case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE: | |
3087 | { | |
7966af57 | 3088 | ret_code = (lttng_error_code) cmd_set_consumer_uri(session, uri_count, uris); |
b178f53e JG |
3089 | break; |
3090 | } | |
3091 | default: | |
3092 | ret_code = LTTNG_ERR_INVALID; | |
e32d7f27 | 3093 | goto end; |
2f77fc4b | 3094 | } |
b178f53e JG |
3095 | end: |
3096 | return ret_code; | |
3097 | } | |
3098 | ||
3099 | static | |
3100 | enum lttng_error_code cmd_create_session_from_descriptor( | |
3101 | struct lttng_session_descriptor *descriptor, | |
3102 | const lttng_sock_cred *creds, | |
3103 | const char *home_path) | |
3104 | { | |
3105 | int ret; | |
3106 | enum lttng_error_code ret_code; | |
3107 | const char *session_name; | |
3108 | struct ltt_session *new_session = NULL; | |
3109 | enum lttng_session_descriptor_status descriptor_status; | |
2f77fc4b | 3110 | |
e32d7f27 | 3111 | session_lock_list(); |
b178f53e JG |
3112 | if (home_path) { |
3113 | if (*home_path != '/') { | |
3114 | ERR("Home path provided by client is not absolute"); | |
3115 | ret_code = LTTNG_ERR_INVALID; | |
3116 | goto end; | |
3117 | } | |
3118 | } | |
2f77fc4b | 3119 | |
b178f53e JG |
3120 | descriptor_status = lttng_session_descriptor_get_session_name( |
3121 | descriptor, &session_name); | |
3122 | switch (descriptor_status) { | |
3123 | case LTTNG_SESSION_DESCRIPTOR_STATUS_OK: | |
3124 | break; | |
3125 | case LTTNG_SESSION_DESCRIPTOR_STATUS_UNSET: | |
3126 | session_name = NULL; | |
3127 | break; | |
3128 | default: | |
3129 | ret_code = LTTNG_ERR_INVALID; | |
3130 | goto end; | |
3131 | } | |
e3876bf0 | 3132 | |
b178f53e | 3133 | ret_code = session_create(session_name, creds->uid, creds->gid, |
e3876bf0 | 3134 | &new_session); |
b178f53e | 3135 | if (ret_code != LTTNG_OK) { |
e32d7f27 | 3136 | goto end; |
2f77fc4b DG |
3137 | } |
3138 | ||
b178f53e JG |
3139 | if (!session_name) { |
3140 | ret = lttng_session_descriptor_set_session_name(descriptor, | |
3141 | new_session->name); | |
3142 | if (ret) { | |
3143 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
3144 | goto end; | |
3145 | } | |
3146 | } | |
3147 | ||
3148 | if (!lttng_session_descriptor_is_output_destination_initialized( | |
3149 | descriptor)) { | |
3150 | /* | |
3151 | * Only include the session's creation time in the output | |
3152 | * destination if the name of the session itself was | |
3153 | * not auto-generated. | |
3154 | */ | |
3155 | ret_code = lttng_session_descriptor_set_default_output( | |
3156 | descriptor, | |
3157 | session_name ? &new_session->creation_time : NULL, | |
3158 | home_path); | |
3159 | if (ret_code != LTTNG_OK) { | |
e32d7f27 | 3160 | goto end; |
2bba9e53 | 3161 | } |
2bba9e53 | 3162 | } else { |
b178f53e JG |
3163 | new_session->has_user_specified_directory = |
3164 | lttng_session_descriptor_has_output_directory( | |
3165 | descriptor); | |
2f77fc4b DG |
3166 | } |
3167 | ||
b178f53e JG |
3168 | switch (lttng_session_descriptor_get_type(descriptor)) { |
3169 | case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT: | |
3170 | new_session->snapshot_mode = 1; | |
3171 | break; | |
3172 | case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE: | |
3173 | new_session->live_timer = | |
3174 | lttng_session_descriptor_live_get_timer_interval( | |
3175 | descriptor); | |
3176 | break; | |
3177 | default: | |
3178 | break; | |
3179 | } | |
2f77fc4b | 3180 | |
b178f53e JG |
3181 | ret_code = set_session_output_from_descriptor(new_session, descriptor); |
3182 | if (ret_code != LTTNG_OK) { | |
3183 | goto end; | |
3184 | } | |
3185 | new_session->consumer->enabled = 1; | |
3186 | ret_code = LTTNG_OK; | |
e32d7f27 | 3187 | end: |
b178f53e JG |
3188 | /* Release reference provided by the session_create function. */ |
3189 | session_put(new_session); | |
3190 | if (ret_code != LTTNG_OK && new_session) { | |
3191 | /* Release the global reference on error. */ | |
3192 | session_destroy(new_session); | |
e32d7f27 | 3193 | } |
b178f53e JG |
3194 | session_unlock_list(); |
3195 | return ret_code; | |
2f77fc4b DG |
3196 | } |
3197 | ||
b178f53e JG |
3198 | enum lttng_error_code cmd_create_session(struct command_ctx *cmd_ctx, int sock, |
3199 | struct lttng_session_descriptor **return_descriptor) | |
27babd3a DG |
3200 | { |
3201 | int ret; | |
b178f53e JG |
3202 | size_t payload_size; |
3203 | struct lttng_dynamic_buffer payload; | |
3204 | struct lttng_buffer_view home_dir_view; | |
3205 | struct lttng_buffer_view session_descriptor_view; | |
3206 | struct lttng_session_descriptor *session_descriptor = NULL; | |
3207 | enum lttng_error_code ret_code; | |
3208 | ||
3209 | lttng_dynamic_buffer_init(&payload); | |
3a91de3a | 3210 | if (cmd_ctx->lsm.u.create_session.home_dir_size >= |
b178f53e JG |
3211 | LTTNG_PATH_MAX) { |
3212 | ret_code = LTTNG_ERR_INVALID; | |
3213 | goto error; | |
27babd3a | 3214 | } |
3a91de3a | 3215 | if (cmd_ctx->lsm.u.create_session.session_descriptor_size > |
b178f53e JG |
3216 | LTTNG_SESSION_DESCRIPTOR_MAX_LEN) { |
3217 | ret_code = LTTNG_ERR_INVALID; | |
3218 | goto error; | |
27babd3a DG |
3219 | } |
3220 | ||
3a91de3a JG |
3221 | payload_size = cmd_ctx->lsm.u.create_session.home_dir_size + |
3222 | cmd_ctx->lsm.u.create_session.session_descriptor_size; | |
b178f53e JG |
3223 | ret = lttng_dynamic_buffer_set_size(&payload, payload_size); |
3224 | if (ret) { | |
3225 | ret_code = LTTNG_ERR_NOMEM; | |
3226 | goto error; | |
27babd3a DG |
3227 | } |
3228 | ||
b178f53e JG |
3229 | ret = lttcomm_recv_unix_sock(sock, payload.data, payload.size); |
3230 | if (ret <= 0) { | |
3231 | ERR("Reception of session descriptor failed, aborting."); | |
3232 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
3233 | goto error; | |
27babd3a DG |
3234 | } |
3235 | ||
b178f53e JG |
3236 | home_dir_view = lttng_buffer_view_from_dynamic_buffer( |
3237 | &payload, | |
3238 | 0, | |
3a91de3a | 3239 | cmd_ctx->lsm.u.create_session.home_dir_size); |
3e6e0df2 JG |
3240 | if (cmd_ctx->lsm.u.create_session.home_dir_size > 0 && |
3241 | !lttng_buffer_view_is_valid(&home_dir_view)) { | |
3242 | ERR("Invalid payload in \"create session\" command: buffer too short to contain home directory"); | |
3243 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; | |
3244 | goto error; | |
3245 | } | |
3246 | ||
b178f53e JG |
3247 | session_descriptor_view = lttng_buffer_view_from_dynamic_buffer( |
3248 | &payload, | |
3a91de3a JG |
3249 | cmd_ctx->lsm.u.create_session.home_dir_size, |
3250 | cmd_ctx->lsm.u.create_session.session_descriptor_size); | |
3e6e0df2 JG |
3251 | if (!lttng_buffer_view_is_valid(&session_descriptor_view)) { |
3252 | ERR("Invalid payload in \"create session\" command: buffer too short to contain session descriptor"); | |
3253 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; | |
3254 | goto error; | |
3255 | } | |
27babd3a | 3256 | |
b178f53e JG |
3257 | ret = lttng_session_descriptor_create_from_buffer( |
3258 | &session_descriptor_view, &session_descriptor); | |
3259 | if (ret < 0) { | |
3260 | ERR("Failed to create session descriptor from payload of \"create session\" command"); | |
3261 | ret_code = LTTNG_ERR_INVALID; | |
3262 | goto error; | |
3263 | } | |
27babd3a | 3264 | |
b178f53e JG |
3265 | /* |
3266 | * Sets the descriptor's auto-generated properties (name, output) if | |
3267 | * needed. | |
3268 | */ | |
3269 | ret_code = cmd_create_session_from_descriptor(session_descriptor, | |
3270 | &cmd_ctx->creds, | |
3271 | home_dir_view.size ? home_dir_view.data : NULL); | |
3272 | if (ret_code != LTTNG_OK) { | |
3273 | goto error; | |
e32d7f27 | 3274 | } |
b178f53e JG |
3275 | |
3276 | ret_code = LTTNG_OK; | |
3277 | *return_descriptor = session_descriptor; | |
3278 | session_descriptor = NULL; | |
3279 | error: | |
3280 | lttng_dynamic_buffer_reset(&payload); | |
3281 | lttng_session_descriptor_destroy(session_descriptor); | |
3282 | return ret_code; | |
27babd3a DG |
3283 | } |
3284 | ||
3e3665b8 JG |
3285 | static |
3286 | void cmd_destroy_session_reply(const struct ltt_session *session, | |
3287 | void *_reply_context) | |
3288 | { | |
3289 | int ret; | |
3290 | ssize_t comm_ret; | |
3291 | const struct cmd_destroy_session_reply_context *reply_context = | |
7966af57 | 3292 | (cmd_destroy_session_reply_context *) _reply_context; |
3e3665b8 JG |
3293 | struct lttng_dynamic_buffer payload; |
3294 | struct lttcomm_session_destroy_command_header cmd_header; | |
3295 | struct lttng_trace_archive_location *location = NULL; | |
3296 | struct lttcomm_lttng_msg llm = { | |
3297 | .cmd_type = LTTNG_DESTROY_SESSION, | |
3285a971 | 3298 | .ret_code = reply_context->destruction_status, |
3e3665b8 JG |
3299 | .pid = UINT32_MAX, |
3300 | .cmd_header_size = | |
3301 | sizeof(struct lttcomm_session_destroy_command_header), | |
3302 | .data_size = 0, | |
1c9a0b0e | 3303 | .fd_count = 0, |
3e3665b8 JG |
3304 | }; |
3305 | size_t payload_size_before_location; | |
3306 | ||
3307 | lttng_dynamic_buffer_init(&payload); | |
3308 | ||
3309 | ret = lttng_dynamic_buffer_append(&payload, &llm, sizeof(llm)); | |
0e270a1e | 3310 | if (ret) { |
3e3665b8 JG |
3311 | ERR("Failed to append session destruction message"); |
3312 | goto error; | |
0e270a1e | 3313 | } |
3e3665b8 JG |
3314 | |
3315 | cmd_header.rotation_state = | |
3316 | (int32_t) (reply_context->implicit_rotation_on_destroy ? | |
3317 | session->rotation_state : | |
3318 | LTTNG_ROTATION_STATE_NO_ROTATION); | |
3319 | ret = lttng_dynamic_buffer_append(&payload, &cmd_header, | |
3320 | sizeof(cmd_header)); | |
3321 | if (ret) { | |
3322 | ERR("Failed to append session destruction command header"); | |
3323 | goto error; | |
3324 | } | |
3325 | ||
3326 | if (!reply_context->implicit_rotation_on_destroy) { | |
3327 | DBG("No implicit rotation performed during the destruction of session \"%s\", sending reply", | |
3328 | session->name); | |
3329 | goto send_reply; | |
3330 | } | |
3331 | if (session->rotation_state != LTTNG_ROTATION_STATE_COMPLETED) { | |
3332 | DBG("Rotation state of session \"%s\" is not \"completed\", sending session destruction reply", | |
3333 | session->name); | |
3334 | goto send_reply; | |
3335 | } | |
3336 | ||
3337 | location = session_get_trace_archive_location(session); | |
3338 | if (!location) { | |
3339 | ERR("Failed to get the location of the trace archive produced during the destruction of session \"%s\"", | |
3340 | session->name); | |
3341 | goto error; | |
3342 | } | |
3343 | ||
3344 | payload_size_before_location = payload.size; | |
3345 | comm_ret = lttng_trace_archive_location_serialize(location, | |
3346 | &payload); | |
d3740619 | 3347 | lttng_trace_archive_location_put(location); |
3e3665b8 JG |
3348 | if (comm_ret < 0) { |
3349 | ERR("Failed to serialize the location of the trace archive produced during the destruction of session \"%s\"", | |
3350 | session->name); | |
3351 | goto error; | |
3352 | } | |
3353 | /* Update the message to indicate the location's length. */ | |
3354 | ((struct lttcomm_lttng_msg *) payload.data)->data_size = | |
3355 | payload.size - payload_size_before_location; | |
3356 | send_reply: | |
3357 | comm_ret = lttcomm_send_unix_sock(reply_context->reply_sock_fd, | |
3358 | payload.data, payload.size); | |
3359 | if (comm_ret != (ssize_t) payload.size) { | |
3360 | ERR("Failed to send result of the destruction of session \"%s\" to client", | |
3361 | session->name); | |
3362 | } | |
3363 | error: | |
3364 | ret = close(reply_context->reply_sock_fd); | |
3365 | if (ret) { | |
3366 | PERROR("Failed to close client socket in deferred session destroy reply"); | |
3367 | } | |
3368 | lttng_dynamic_buffer_reset(&payload); | |
3369 | free(_reply_context); | |
3370 | } | |
3371 | ||
2f77fc4b DG |
3372 | /* |
3373 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
a9ad0c8f MD |
3374 | * |
3375 | * Called with session lock held. | |
2f77fc4b | 3376 | */ |
e32d7f27 | 3377 | int cmd_destroy_session(struct ltt_session *session, |
3e3665b8 JG |
3378 | struct notification_thread_handle *notification_thread_handle, |
3379 | int *sock_fd) | |
2f77fc4b DG |
3380 | { |
3381 | int ret; | |
3285a971 | 3382 | enum lttng_error_code destruction_last_error = LTTNG_OK; |
3e3665b8 JG |
3383 | struct cmd_destroy_session_reply_context *reply_context = NULL; |
3384 | ||
3385 | if (sock_fd) { | |
64803277 | 3386 | reply_context = zmalloc<cmd_destroy_session_reply_context>(); |
3e3665b8 JG |
3387 | if (!reply_context) { |
3388 | ret = LTTNG_ERR_NOMEM; | |
3389 | goto end; | |
3390 | } | |
64803277 | 3391 | |
3e3665b8 JG |
3392 | reply_context->reply_sock_fd = *sock_fd; |
3393 | } | |
2f77fc4b DG |
3394 | |
3395 | /* Safety net */ | |
a0377dfe | 3396 | LTTNG_ASSERT(session); |
2f77fc4b | 3397 | |
3e3665b8 JG |
3398 | DBG("Begin destroy session %s (id %" PRIu64 ")", session->name, |
3399 | session->id); | |
3400 | if (session->active) { | |
3401 | DBG("Session \"%s\" is active, attempting to stop it before destroying it", | |
3402 | session->name); | |
3403 | ret = cmd_stop_trace(session); | |
3404 | if (ret != LTTNG_OK && ret != LTTNG_ERR_TRACE_ALREADY_STOPPED) { | |
3405 | /* Carry on with the destruction of the session. */ | |
3406 | ERR("Failed to stop session \"%s\" as part of its destruction: %s", | |
3407 | session->name, lttng_strerror(-ret)); | |
7966af57 | 3408 | destruction_last_error = (lttng_error_code) ret; |
3e3665b8 JG |
3409 | } |
3410 | } | |
5c408ad8 | 3411 | |
92816cc3 JG |
3412 | if (session->rotation_schedule_timer_enabled) { |
3413 | if (timer_session_rotation_schedule_timer_stop( | |
3414 | session)) { | |
3415 | ERR("Failed to stop the \"rotation schedule\" timer of session %s", | |
3416 | session->name); | |
3285a971 | 3417 | destruction_last_error = LTTNG_ERR_TIMER_STOP_ERROR; |
92816cc3 | 3418 | } |
259c2674 JD |
3419 | } |
3420 | ||
90936dcf JD |
3421 | if (session->rotate_size) { |
3422 | unsubscribe_session_consumed_size_rotation(session, notification_thread_handle); | |
3423 | session->rotate_size = 0; | |
3424 | } | |
3425 | ||
a7ceb342 | 3426 | if (session->rotated && session->current_trace_chunk && session->output_traces) { |
b5893d8e JG |
3427 | /* |
3428 | * Perform a last rotation on destruction if rotations have | |
3429 | * occurred during the session's lifetime. | |
3430 | */ | |
343defc2 MD |
3431 | ret = cmd_rotate_session(session, NULL, false, |
3432 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED); | |
d2956687 JG |
3433 | if (ret != LTTNG_OK) { |
3434 | ERR("Failed to perform an implicit rotation as part of the destruction of session \"%s\": %s", | |
3435 | session->name, lttng_strerror(-ret)); | |
7966af57 | 3436 | destruction_last_error = (lttng_error_code) -ret; |
124473a3 | 3437 | } |
0e270a1e | 3438 | if (reply_context) { |
3e3665b8 | 3439 | reply_context->implicit_rotation_on_destroy = true; |
0e270a1e JG |
3440 | } |
3441 | } else if (session->has_been_started && session->current_trace_chunk) { | |
7fdbed1c JG |
3442 | /* |
3443 | * The user has not triggered a session rotation. However, to | |
3444 | * ensure all data has been consumed, the session is rotated | |
3445 | * to a 'null' trace chunk before it is destroyed. | |
3446 | * | |
3447 | * This is a "quiet" rotation meaning that no notification is | |
3448 | * emitted and no renaming of the current trace chunk takes | |
3449 | * place. | |
3450 | */ | |
343defc2 MD |
3451 | ret = cmd_rotate_session(session, NULL, true, |
3452 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION); | |
53fb6336 JG |
3453 | /* |
3454 | * Rotation operations may not be supported by the kernel | |
3455 | * tracer. Hence, do not consider this implicit rotation as | |
3456 | * a session destruction error. The library has already stopped | |
3457 | * the session and waited for pending data; there is nothing | |
3458 | * left to do but complete the destruction of the session. | |
3459 | */ | |
3460 | if (ret != LTTNG_OK && | |
3461 | ret != -LTTNG_ERR_ROTATION_NOT_AVAILABLE_KERNEL) { | |
7fdbed1c | 3462 | ERR("Failed to perform a quiet rotation as part of the destruction of session \"%s\": %s", |
53fb6336 | 3463 | session->name, lttng_strerror(ret)); |
7966af57 | 3464 | destruction_last_error = (lttng_error_code) -ret; |
7fdbed1c JG |
3465 | } |
3466 | } | |
5c408ad8 | 3467 | |
a503e1ef JG |
3468 | if (session->shm_path[0]) { |
3469 | /* | |
3470 | * When a session is created with an explicit shm_path, | |
3471 | * the consumer daemon will create its shared memory files | |
3472 | * at that location and will *not* unlink them. This is normal | |
3473 | * as the intention of that feature is to make it possible | |
3474 | * to retrieve the content of those files should a crash occur. | |
3475 | * | |
3476 | * To ensure the content of those files can be used, the | |
3477 | * sessiond daemon will replicate the content of the metadata | |
3478 | * cache in a metadata file. | |
3479 | * | |
3480 | * On clean-up, it is expected that the consumer daemon will | |
3481 | * unlink the shared memory files and that the session daemon | |
3482 | * will unlink the metadata file. Then, the session's directory | |
3483 | * in the shm path can be removed. | |
3484 | * | |
3485 | * Unfortunately, a flaw in the design of the sessiond's and | |
3486 | * consumerd's tear down of channels makes it impossible to | |
3487 | * determine when the sessiond _and_ the consumerd have both | |
3488 | * destroyed their representation of a channel. For one, the | |
3489 | * unlinking, close, and rmdir happen in deferred 'call_rcu' | |
3490 | * callbacks in both daemons. | |
3491 | * | |
3492 | * However, it is also impossible for the sessiond to know when | |
3493 | * the consumer daemon is done destroying its channel(s) since | |
3494 | * it occurs as a reaction to the closing of the channel's file | |
3495 | * descriptor. There is no resulting communication initiated | |
3496 | * from the consumerd to the sessiond to confirm that the | |
3497 | * operation is completed (and was successful). | |
3498 | * | |
3499 | * Until this is all fixed, the session daemon checks for the | |
3500 | * removal of the session's shm path which makes it possible | |
3501 | * to safely advertise a session as having been destroyed. | |
3502 | * | |
3503 | * Prior to this fix, it was not possible to reliably save | |
3504 | * a session making use of the --shm-path option, destroy it, | |
3505 | * and load it again. This is because the creation of the | |
3506 | * session would fail upon seeing the session's shm path | |
3507 | * already in existence. | |
3508 | * | |
3509 | * Note that none of the error paths in the check for the | |
3510 | * directory's existence return an error. This is normal | |
3511 | * as there isn't much that can be done. The session will | |
3512 | * be destroyed properly, except that we can't offer the | |
3513 | * guarantee that the same session can be re-created. | |
3514 | */ | |
3515 | current_completion_handler = &destroy_completion_handler.handler; | |
3516 | ret = lttng_strncpy(destroy_completion_handler.shm_path, | |
3517 | session->shm_path, | |
3518 | sizeof(destroy_completion_handler.shm_path)); | |
a0377dfe | 3519 | LTTNG_ASSERT(!ret); |
a503e1ef | 3520 | } |
e32d7f27 JG |
3521 | |
3522 | /* | |
3523 | * The session is destroyed. However, note that the command context | |
3524 | * still holds a reference to the session, thus delaying its destruction | |
3525 | * _at least_ up to the point when that reference is released. | |
3526 | */ | |
3527 | session_destroy(session); | |
3e3665b8 | 3528 | if (reply_context) { |
3285a971 | 3529 | reply_context->destruction_status = destruction_last_error; |
3e3665b8 JG |
3530 | ret = session_add_destroy_notifier(session, |
3531 | cmd_destroy_session_reply, | |
3532 | (void *) reply_context); | |
3533 | if (ret) { | |
3534 | ret = LTTNG_ERR_FATAL; | |
3535 | goto end; | |
3536 | } else { | |
3537 | *sock_fd = -1; | |
3538 | } | |
0e270a1e JG |
3539 | } |
3540 | ret = LTTNG_OK; | |
3e3665b8 | 3541 | end: |
2f77fc4b DG |
3542 | return ret; |
3543 | } | |
3544 | ||
2f77fc4b DG |
3545 | /* |
3546 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
3547 | */ | |
56a37563 JG |
3548 | int cmd_register_consumer(struct ltt_session *session, |
3549 | enum lttng_domain_type domain, const char *sock_path, | |
3550 | struct consumer_data *cdata) | |
2f77fc4b DG |
3551 | { |
3552 | int ret, sock; | |
dd81b457 | 3553 | struct consumer_socket *socket = NULL; |
2f77fc4b | 3554 | |
a0377dfe FD |
3555 | LTTNG_ASSERT(session); |
3556 | LTTNG_ASSERT(cdata); | |
3557 | LTTNG_ASSERT(sock_path); | |
2f77fc4b DG |
3558 | |
3559 | switch (domain) { | |
3560 | case LTTNG_DOMAIN_KERNEL: | |
3561 | { | |
3562 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3563 | ||
a0377dfe | 3564 | LTTNG_ASSERT(ksess); |
2f77fc4b DG |
3565 | |
3566 | /* Can't register a consumer if there is already one */ | |
3567 | if (ksess->consumer_fds_sent != 0) { | |
f73fabfd | 3568 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
3569 | goto error; |
3570 | } | |
3571 | ||
3572 | sock = lttcomm_connect_unix_sock(sock_path); | |
3573 | if (sock < 0) { | |
f73fabfd | 3574 | ret = LTTNG_ERR_CONNECT_FAIL; |
2f77fc4b DG |
3575 | goto error; |
3576 | } | |
4ce514c4 | 3577 | cdata->cmd_sock = sock; |
2f77fc4b | 3578 | |
4ce514c4 | 3579 | socket = consumer_allocate_socket(&cdata->cmd_sock); |
2f77fc4b | 3580 | if (socket == NULL) { |
f66c074c DG |
3581 | ret = close(sock); |
3582 | if (ret < 0) { | |
3583 | PERROR("close register consumer"); | |
3584 | } | |
4ce514c4 | 3585 | cdata->cmd_sock = -1; |
f73fabfd | 3586 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
3587 | goto error; |
3588 | } | |
3589 | ||
64803277 | 3590 | socket->lock = zmalloc<pthread_mutex_t>(); |
2f77fc4b DG |
3591 | if (socket->lock == NULL) { |
3592 | PERROR("zmalloc pthread mutex"); | |
f73fabfd | 3593 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
3594 | goto error; |
3595 | } | |
64803277 | 3596 | |
2f77fc4b DG |
3597 | pthread_mutex_init(socket->lock, NULL); |
3598 | socket->registered = 1; | |
3599 | ||
3600 | rcu_read_lock(); | |
3601 | consumer_add_socket(socket, ksess->consumer); | |
3602 | rcu_read_unlock(); | |
3603 | ||
3604 | pthread_mutex_lock(&cdata->pid_mutex); | |
3605 | cdata->pid = -1; | |
3606 | pthread_mutex_unlock(&cdata->pid_mutex); | |
3607 | ||
3608 | break; | |
3609 | } | |
3610 | default: | |
3611 | /* TODO: Userspace tracing */ | |
f73fabfd | 3612 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3613 | goto error; |
3614 | } | |
3615 | ||
dd81b457 | 3616 | return LTTNG_OK; |
2f77fc4b DG |
3617 | |
3618 | error: | |
dd81b457 DG |
3619 | if (socket) { |
3620 | consumer_destroy_socket(socket); | |
3621 | } | |
2f77fc4b DG |
3622 | return ret; |
3623 | } | |
3624 | ||
3625 | /* | |
3626 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
3627 | */ | |
3628 | ssize_t cmd_list_domains(struct ltt_session *session, | |
3629 | struct lttng_domain **domains) | |
3630 | { | |
3631 | int ret, index = 0; | |
3632 | ssize_t nb_dom = 0; | |
fefd409b DG |
3633 | struct agent *agt; |
3634 | struct lttng_ht_iter iter; | |
2f77fc4b DG |
3635 | |
3636 | if (session->kernel_session != NULL) { | |
3637 | DBG3("Listing domains found kernel domain"); | |
3638 | nb_dom++; | |
3639 | } | |
3640 | ||
3641 | if (session->ust_session != NULL) { | |
3642 | DBG3("Listing domains found UST global domain"); | |
3643 | nb_dom++; | |
3c6a091f | 3644 | |
e0a74f01 | 3645 | rcu_read_lock(); |
fefd409b DG |
3646 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
3647 | agt, node.node) { | |
3648 | if (agt->being_used) { | |
3649 | nb_dom++; | |
3650 | } | |
3c6a091f | 3651 | } |
e0a74f01 | 3652 | rcu_read_unlock(); |
2f77fc4b DG |
3653 | } |
3654 | ||
fa64dfb4 JG |
3655 | if (!nb_dom) { |
3656 | goto end; | |
3657 | } | |
3658 | ||
64803277 | 3659 | *domains = calloc<lttng_domain>(nb_dom); |
2f77fc4b | 3660 | if (*domains == NULL) { |
f73fabfd | 3661 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
3662 | goto error; |
3663 | } | |
3664 | ||
3665 | if (session->kernel_session != NULL) { | |
3666 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
b5edb9e8 PP |
3667 | |
3668 | /* Kernel session buffer type is always GLOBAL */ | |
3669 | (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL; | |
3670 | ||
2f77fc4b DG |
3671 | index++; |
3672 | } | |
3673 | ||
3674 | if (session->ust_session != NULL) { | |
3675 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
88c5f0d8 | 3676 | (*domains)[index].buf_type = session->ust_session->buffer_type; |
2f77fc4b | 3677 | index++; |
3c6a091f | 3678 | |
e0a74f01 | 3679 | rcu_read_lock(); |
fefd409b DG |
3680 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
3681 | agt, node.node) { | |
3682 | if (agt->being_used) { | |
3683 | (*domains)[index].type = agt->domain; | |
3684 | (*domains)[index].buf_type = session->ust_session->buffer_type; | |
3685 | index++; | |
3686 | } | |
3c6a091f | 3687 | } |
e0a74f01 | 3688 | rcu_read_unlock(); |
2f77fc4b | 3689 | } |
fa64dfb4 | 3690 | end: |
2f77fc4b DG |
3691 | return nb_dom; |
3692 | ||
3693 | error: | |
f73fabfd DG |
3694 | /* Return negative value to differentiate return code */ |
3695 | return -ret; | |
2f77fc4b DG |
3696 | } |
3697 | ||
3698 | ||
3699 | /* | |
3700 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
3701 | */ | |
999af9c1 JR |
3702 | enum lttng_error_code cmd_list_channels(enum lttng_domain_type domain, |
3703 | struct ltt_session *session, | |
3704 | struct lttng_payload *payload) | |
2f77fc4b | 3705 | { |
999af9c1 JR |
3706 | int ret = 0; |
3707 | unsigned int i = 0; | |
3708 | struct lttcomm_list_command_header cmd_header = {}; | |
3709 | size_t cmd_header_offset; | |
3710 | enum lttng_error_code ret_code; | |
3711 | ||
3712 | assert(session); | |
3713 | assert(payload); | |
3714 | ||
3715 | DBG("Listing channels for session %s", session->name); | |
3716 | ||
3717 | cmd_header_offset = payload->buffer.size; | |
3718 | ||
3719 | /* Reserve space for command reply header. */ | |
3720 | ret = lttng_dynamic_buffer_set_size(&payload->buffer, | |
3721 | cmd_header_offset + sizeof(cmd_header)); | |
3722 | if (ret) { | |
3723 | ret_code = LTTNG_ERR_NOMEM; | |
3724 | goto end; | |
3725 | } | |
2f77fc4b DG |
3726 | |
3727 | switch (domain) { | |
3728 | case LTTNG_DOMAIN_KERNEL: | |
999af9c1 JR |
3729 | { |
3730 | /* Kernel channels */ | |
3731 | struct ltt_kernel_channel *kchan; | |
2f77fc4b | 3732 | if (session->kernel_session != NULL) { |
999af9c1 JR |
3733 | cds_list_for_each_entry(kchan, |
3734 | &session->kernel_session->channel_list.head, list) { | |
3735 | uint64_t discarded_events, lost_packets; | |
3736 | struct lttng_channel_extended *extended; | |
3737 | ||
3738 | extended = (struct lttng_channel_extended *) | |
3739 | kchan->channel->attr.extended.ptr; | |
3740 | ||
3741 | ret = get_kernel_runtime_stats(session, kchan, | |
3742 | &discarded_events, &lost_packets); | |
3743 | if (ret < 0) { | |
3744 | ret_code = LTTNG_ERR_UNK; | |
3745 | goto end; | |
3746 | } | |
3747 | ||
3748 | /* | |
3749 | * Update the discarded_events and lost_packets | |
3750 | * count for the channel | |
3751 | */ | |
3752 | extended->discarded_events = discarded_events; | |
3753 | extended->lost_packets = lost_packets; | |
3754 | ||
3755 | ret = lttng_channel_serialize( | |
3756 | kchan->channel, &payload->buffer); | |
3757 | if (ret) { | |
3758 | ERR("Failed to serialize lttng_channel: channel name = '%s'", | |
3759 | kchan->channel->name); | |
3760 | ret_code = LTTNG_ERR_UNK; | |
3761 | goto end; | |
3762 | } | |
3763 | ||
3764 | i++; | |
3765 | } | |
c7d620a2 | 3766 | } |
2f77fc4b | 3767 | break; |
999af9c1 | 3768 | } |
2f77fc4b | 3769 | case LTTNG_DOMAIN_UST: |
999af9c1 JR |
3770 | { |
3771 | struct lttng_ht_iter iter; | |
3772 | struct ltt_ust_channel *uchan; | |
3773 | ||
3774 | rcu_read_lock(); | |
3775 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, | |
3776 | &iter.iter, uchan, node.node) { | |
3777 | uint64_t discarded_events = 0, lost_packets = 0; | |
3778 | struct lttng_channel *channel = NULL; | |
3779 | struct lttng_channel_extended *extended; | |
3780 | ||
3781 | channel = trace_ust_channel_to_lttng_channel(uchan); | |
3782 | if (!channel) { | |
9402f166 JR |
3783 | ret_code = LTTNG_ERR_NOMEM; |
3784 | goto end; | |
999af9c1 JR |
3785 | } |
3786 | ||
3787 | extended = (struct lttng_channel_extended *) | |
3788 | channel->attr.extended.ptr; | |
3789 | ||
3790 | ret = get_ust_runtime_stats(session, uchan, | |
3791 | &discarded_events, &lost_packets); | |
3792 | if (ret < 0) { | |
3793 | lttng_channel_destroy(channel); | |
3794 | ret_code = LTTNG_ERR_UNK; | |
9402f166 | 3795 | goto end; |
999af9c1 JR |
3796 | } |
3797 | ||
3798 | extended->discarded_events = discarded_events; | |
3799 | extended->lost_packets = lost_packets; | |
3800 | ||
3801 | ret = lttng_channel_serialize( | |
3802 | channel, &payload->buffer); | |
3803 | if (ret) { | |
3804 | ERR("Failed to serialize lttng_channel: channel name = '%s'", | |
3805 | channel->name); | |
ae2275af | 3806 | lttng_channel_destroy(channel); |
999af9c1 | 3807 | ret_code = LTTNG_ERR_UNK; |
9402f166 | 3808 | goto end; |
999af9c1 JR |
3809 | } |
3810 | ||
ae2275af | 3811 | lttng_channel_destroy(channel); |
999af9c1 | 3812 | i++; |
c7d620a2 | 3813 | } |
999af9c1 | 3814 | rcu_read_unlock(); |
2f77fc4b | 3815 | break; |
999af9c1 | 3816 | } |
2f77fc4b | 3817 | default: |
999af9c1 | 3818 | break; |
2f77fc4b DG |
3819 | } |
3820 | ||
999af9c1 JR |
3821 | if (i > UINT32_MAX) { |
3822 | ERR("Channel count would overflow the channel listing command's reply"); | |
3823 | ret_code = LTTNG_ERR_OVERFLOW; | |
3824 | goto end; | |
2f77fc4b DG |
3825 | } |
3826 | ||
999af9c1 JR |
3827 | /* Update command reply header. */ |
3828 | cmd_header.count = (uint32_t) i; | |
3829 | memcpy(payload->buffer.data + cmd_header_offset, &cmd_header, | |
3830 | sizeof(cmd_header)); | |
3831 | ret_code = LTTNG_OK; | |
3832 | ||
53e367f9 | 3833 | end: |
999af9c1 | 3834 | return ret_code; |
2f77fc4b DG |
3835 | } |
3836 | ||
3837 | /* | |
3838 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3839 | */ | |
8ddd72ef JR |
3840 | enum lttng_error_code cmd_list_events(enum lttng_domain_type domain, |
3841 | struct ltt_session *session, | |
3842 | char *channel_name, | |
3843 | struct lttng_payload *reply_payload) | |
2f77fc4b | 3844 | { |
8ddd72ef JR |
3845 | int buffer_resize_ret; |
3846 | enum lttng_error_code ret_code = LTTNG_OK; | |
3847 | struct lttcomm_list_command_header reply_command_header = {}; | |
3848 | size_t reply_command_header_offset; | |
23831239 | 3849 | unsigned int nb_events = 0; |
e368fb43 | 3850 | |
8ddd72ef JR |
3851 | assert(reply_payload); |
3852 | ||
3853 | /* Reserve space for command reply header. */ | |
3854 | reply_command_header_offset = reply_payload->buffer.size; | |
3855 | buffer_resize_ret = lttng_dynamic_buffer_set_size(&reply_payload->buffer, | |
3856 | reply_command_header_offset + | |
3857 | sizeof(struct lttcomm_list_command_header)); | |
3858 | if (buffer_resize_ret) { | |
3859 | ret_code = LTTNG_ERR_NOMEM; | |
3860 | goto end; | |
e368fb43 | 3861 | } |
2f77fc4b DG |
3862 | |
3863 | switch (domain) { | |
3864 | case LTTNG_DOMAIN_KERNEL: | |
3865 | if (session->kernel_session != NULL) { | |
8ddd72ef JR |
3866 | ret_code = list_lttng_kernel_events(channel_name, |
3867 | session->kernel_session, reply_payload, &nb_events); | |
2f77fc4b | 3868 | } |
8ddd72ef | 3869 | |
2f77fc4b DG |
3870 | break; |
3871 | case LTTNG_DOMAIN_UST: | |
3872 | { | |
3873 | if (session->ust_session != NULL) { | |
8ddd72ef | 3874 | ret_code = list_lttng_ust_global_events(channel_name, |
e368fb43 | 3875 | &session->ust_session->domain_global, |
8ddd72ef | 3876 | reply_payload, &nb_events); |
2f77fc4b | 3877 | } |
8ddd72ef | 3878 | |
2f77fc4b DG |
3879 | break; |
3880 | } | |
5cdb6027 | 3881 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 3882 | case LTTNG_DOMAIN_JUL: |
0e115563 | 3883 | case LTTNG_DOMAIN_PYTHON: |
3c6a091f | 3884 | if (session->ust_session) { |
fefd409b DG |
3885 | struct lttng_ht_iter iter; |
3886 | struct agent *agt; | |
3887 | ||
b11feea5 | 3888 | rcu_read_lock(); |
fefd409b DG |
3889 | cds_lfht_for_each_entry(session->ust_session->agents->ht, |
3890 | &iter.iter, agt, node.node) { | |
1dfd9906 | 3891 | if (agt->domain == domain) { |
8ddd72ef JR |
3892 | ret_code = list_lttng_agent_events( |
3893 | agt, reply_payload, &nb_events); | |
1dfd9906 JG |
3894 | break; |
3895 | } | |
fefd409b | 3896 | } |
8ddd72ef | 3897 | |
b11feea5 | 3898 | rcu_read_unlock(); |
3c6a091f DG |
3899 | } |
3900 | break; | |
2f77fc4b | 3901 | default: |
8ddd72ef JR |
3902 | ret_code = LTTNG_ERR_UND; |
3903 | break; | |
2f77fc4b DG |
3904 | } |
3905 | ||
8ddd72ef JR |
3906 | if (nb_events > UINT32_MAX) { |
3907 | ret_code = LTTNG_ERR_OVERFLOW; | |
3908 | goto end; | |
3909 | } | |
e368fb43 | 3910 | |
8ddd72ef JR |
3911 | /* Update command reply header. */ |
3912 | reply_command_header.count = (uint32_t) nb_events; | |
3913 | memcpy(reply_payload->buffer.data + reply_command_header_offset, &reply_command_header, | |
3914 | sizeof(reply_command_header)); | |
2f77fc4b | 3915 | |
8ddd72ef JR |
3916 | end: |
3917 | return ret_code; | |
2f77fc4b DG |
3918 | } |
3919 | ||
3920 | /* | |
3921 | * Using the session list, filled a lttng_session array to send back to the | |
3922 | * client for session listing. | |
3923 | * | |
3924 | * The session list lock MUST be acquired before calling this function. Use | |
3925 | * session_lock_list() and session_unlock_list(). | |
3926 | */ | |
b178f53e JG |
3927 | void cmd_list_lttng_sessions(struct lttng_session *sessions, |
3928 | size_t session_count, uid_t uid, gid_t gid) | |
2f77fc4b DG |
3929 | { |
3930 | int ret; | |
3931 | unsigned int i = 0; | |
3932 | struct ltt_session *session; | |
3933 | struct ltt_session_list *list = session_get_list(); | |
0e270a1e | 3934 | struct lttng_session_extended *extended = |
b178f53e | 3935 | (typeof(extended)) (&sessions[session_count]); |
2f77fc4b DG |
3936 | |
3937 | DBG("Getting all available session for UID %d GID %d", | |
3938 | uid, gid); | |
3939 | /* | |
3940 | * Iterate over session list and append data after the control struct in | |
3941 | * the buffer. | |
3942 | */ | |
3943 | cds_list_for_each_entry(session, &list->head, list) { | |
e32d7f27 JG |
3944 | if (!session_get(session)) { |
3945 | continue; | |
3946 | } | |
2f77fc4b DG |
3947 | /* |
3948 | * Only list the sessions the user can control. | |
3949 | */ | |
d7b377ed | 3950 | if (!session_access_ok(session, uid) || |
e32d7f27 JG |
3951 | session->destroyed) { |
3952 | session_put(session); | |
2f77fc4b DG |
3953 | continue; |
3954 | } | |
3955 | ||
3956 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3957 | struct ltt_ust_session *usess = session->ust_session; | |
3958 | ||
3959 | if (session->consumer->type == CONSUMER_DST_NET || | |
3960 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
3961 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
3962 | ret = build_network_session_path(sessions[i].path, | |
dec56f6c | 3963 | sizeof(sessions[i].path), session); |
2f77fc4b | 3964 | } else { |
dec56f6c | 3965 | ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s", |
366a9222 | 3966 | session->consumer->dst.session_root_path); |
2f77fc4b DG |
3967 | } |
3968 | if (ret < 0) { | |
3969 | PERROR("snprintf session path"); | |
e32d7f27 | 3970 | session_put(session); |
2f77fc4b DG |
3971 | continue; |
3972 | } | |
3973 | ||
3974 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
3975 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
8382cf6f | 3976 | sessions[i].enabled = session->active; |
2cbf8fed | 3977 | sessions[i].snapshot_mode = session->snapshot_mode; |
8960e9cd | 3978 | sessions[i].live_timer_interval = session->live_timer; |
b178f53e JG |
3979 | extended[i].creation_time.value = (uint64_t) session->creation_time; |
3980 | extended[i].creation_time.is_set = 1; | |
2f77fc4b | 3981 | i++; |
e32d7f27 | 3982 | session_put(session); |
2f77fc4b DG |
3983 | } |
3984 | } | |
3985 | ||
806e2684 | 3986 | /* |
6d805429 | 3987 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
d3f14b8a | 3988 | * ready for trace analysis (or any kind of reader) or else 1 for pending data. |
806e2684 | 3989 | */ |
6d805429 | 3990 | int cmd_data_pending(struct ltt_session *session) |
806e2684 DG |
3991 | { |
3992 | int ret; | |
3993 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3994 | struct ltt_ust_session *usess = session->ust_session; | |
3995 | ||
a0377dfe | 3996 | LTTNG_ASSERT(session); |
806e2684 | 3997 | |
5c408ad8 JD |
3998 | DBG("Data pending for session %s", session->name); |
3999 | ||
806e2684 | 4000 | /* Session MUST be stopped to ask for data availability. */ |
8382cf6f | 4001 | if (session->active) { |
806e2684 DG |
4002 | ret = LTTNG_ERR_SESSION_STARTED; |
4003 | goto error; | |
3a89d11a DG |
4004 | } else { |
4005 | /* | |
4006 | * If stopped, just make sure we've started before else the above call | |
4007 | * will always send that there is data pending. | |
4008 | * | |
4009 | * The consumer assumes that when the data pending command is received, | |
4010 | * the trace has been started before or else no output data is written | |
4011 | * by the streams which is a condition for data pending. So, this is | |
4012 | * *VERY* important that we don't ask the consumer before a start | |
4013 | * trace. | |
4014 | */ | |
8382cf6f | 4015 | if (!session->has_been_started) { |
3a89d11a DG |
4016 | ret = 0; |
4017 | goto error; | |
4018 | } | |
806e2684 DG |
4019 | } |
4020 | ||
92816cc3 JG |
4021 | /* A rotation is still pending, we have to wait. */ |
4022 | if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) { | |
5c408ad8 JD |
4023 | DBG("Rotate still pending for session %s", session->name); |
4024 | ret = 1; | |
4025 | goto error; | |
4026 | } | |
4027 | ||
806e2684 | 4028 | if (ksess && ksess->consumer) { |
6d805429 DG |
4029 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
4030 | if (ret == 1) { | |
806e2684 DG |
4031 | /* Data is still being extracted for the kernel. */ |
4032 | goto error; | |
4033 | } | |
4034 | } | |
4035 | ||
4036 | if (usess && usess->consumer) { | |
6d805429 DG |
4037 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
4038 | if (ret == 1) { | |
806e2684 DG |
4039 | /* Data is still being extracted for the kernel. */ |
4040 | goto error; | |
4041 | } | |
4042 | } | |
4043 | ||
4044 | /* Data is ready to be read by a viewer */ | |
6d805429 | 4045 | ret = 0; |
806e2684 DG |
4046 | |
4047 | error: | |
4048 | return ret; | |
4049 | } | |
4050 | ||
6dc3064a DG |
4051 | /* |
4052 | * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library. | |
4053 | * | |
4054 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
4055 | */ | |
4056 | int cmd_snapshot_add_output(struct ltt_session *session, | |
df4f5a87 | 4057 | const struct lttng_snapshot_output *output, uint32_t *id) |
6dc3064a DG |
4058 | { |
4059 | int ret; | |
4060 | struct snapshot_output *new_output; | |
4061 | ||
a0377dfe FD |
4062 | LTTNG_ASSERT(session); |
4063 | LTTNG_ASSERT(output); | |
6dc3064a DG |
4064 | |
4065 | DBG("Cmd snapshot add output for session %s", session->name); | |
4066 | ||
4067 | /* | |
903ef685 | 4068 | * Can't create an output if the session is not set in no-output mode. |
6dc3064a DG |
4069 | */ |
4070 | if (session->output_traces) { | |
903ef685 | 4071 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
4072 | goto error; |
4073 | } | |
4074 | ||
54213acc JG |
4075 | if (session->has_non_mmap_channel) { |
4076 | ret = LTTNG_ERR_SNAPSHOT_UNSUPPORTED; | |
4077 | goto error; | |
4078 | } | |
4079 | ||
6dc3064a DG |
4080 | /* Only one output is allowed until we have the "tee" feature. */ |
4081 | if (session->snapshot.nb_output == 1) { | |
4082 | ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST; | |
4083 | goto error; | |
4084 | } | |
4085 | ||
4086 | new_output = snapshot_output_alloc(); | |
4087 | if (!new_output) { | |
4088 | ret = LTTNG_ERR_NOMEM; | |
4089 | goto error; | |
4090 | } | |
4091 | ||
b178f53e | 4092 | ret = snapshot_output_init(session, output->max_size, output->name, |
6dc3064a DG |
4093 | output->ctrl_url, output->data_url, session->consumer, new_output, |
4094 | &session->snapshot); | |
4095 | if (ret < 0) { | |
4096 | if (ret == -ENOMEM) { | |
4097 | ret = LTTNG_ERR_NOMEM; | |
4098 | } else { | |
4099 | ret = LTTNG_ERR_INVALID; | |
4100 | } | |
4101 | goto free_error; | |
4102 | } | |
4103 | ||
6dc3064a DG |
4104 | rcu_read_lock(); |
4105 | snapshot_add_output(&session->snapshot, new_output); | |
4106 | if (id) { | |
4107 | *id = new_output->id; | |
4108 | } | |
4109 | rcu_read_unlock(); | |
4110 | ||
4111 | return LTTNG_OK; | |
4112 | ||
4113 | free_error: | |
4114 | snapshot_output_destroy(new_output); | |
4115 | error: | |
4116 | return ret; | |
4117 | } | |
4118 | ||
4119 | /* | |
4120 | * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl. | |
4121 | * | |
4122 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
4123 | */ | |
4124 | int cmd_snapshot_del_output(struct ltt_session *session, | |
df4f5a87 | 4125 | const struct lttng_snapshot_output *output) |
6dc3064a DG |
4126 | { |
4127 | int ret; | |
eb240553 | 4128 | struct snapshot_output *sout = NULL; |
6dc3064a | 4129 | |
a0377dfe FD |
4130 | LTTNG_ASSERT(session); |
4131 | LTTNG_ASSERT(output); | |
6dc3064a | 4132 | |
6dc3064a DG |
4133 | rcu_read_lock(); |
4134 | ||
4135 | /* | |
d3f14b8a MD |
4136 | * Permission denied to create an output if the session is not |
4137 | * set in no output mode. | |
6dc3064a DG |
4138 | */ |
4139 | if (session->output_traces) { | |
903ef685 | 4140 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
4141 | goto error; |
4142 | } | |
4143 | ||
eb240553 DG |
4144 | if (output->id) { |
4145 | DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id, | |
4146 | session->name); | |
4147 | sout = snapshot_find_output_by_id(output->id, &session->snapshot); | |
4148 | } else if (*output->name != '\0') { | |
4149 | DBG("Cmd snapshot del output name %s for session %s", output->name, | |
4150 | session->name); | |
4151 | sout = snapshot_find_output_by_name(output->name, &session->snapshot); | |
4152 | } | |
6dc3064a DG |
4153 | if (!sout) { |
4154 | ret = LTTNG_ERR_INVALID; | |
4155 | goto error; | |
4156 | } | |
4157 | ||
4158 | snapshot_delete_output(&session->snapshot, sout); | |
4159 | snapshot_output_destroy(sout); | |
4160 | ret = LTTNG_OK; | |
4161 | ||
4162 | error: | |
4163 | rcu_read_unlock(); | |
4164 | return ret; | |
4165 | } | |
4166 | ||
4167 | /* | |
4168 | * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl. | |
4169 | * | |
4170 | * If no output is available, outputs is untouched and 0 is returned. | |
4171 | * | |
4172 | * Return the size of the newly allocated outputs or a negative LTTNG_ERR code. | |
4173 | */ | |
4174 | ssize_t cmd_snapshot_list_outputs(struct ltt_session *session, | |
4175 | struct lttng_snapshot_output **outputs) | |
4176 | { | |
4177 | int ret, idx = 0; | |
b223ca94 | 4178 | struct lttng_snapshot_output *list = NULL; |
6dc3064a DG |
4179 | struct lttng_ht_iter iter; |
4180 | struct snapshot_output *output; | |
4181 | ||
a0377dfe FD |
4182 | LTTNG_ASSERT(session); |
4183 | LTTNG_ASSERT(outputs); | |
6dc3064a DG |
4184 | |
4185 | DBG("Cmd snapshot list outputs for session %s", session->name); | |
4186 | ||
4187 | /* | |
d3f14b8a MD |
4188 | * Permission denied to create an output if the session is not |
4189 | * set in no output mode. | |
6dc3064a DG |
4190 | */ |
4191 | if (session->output_traces) { | |
903ef685 JG |
4192 | ret = -LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
4193 | goto end; | |
6dc3064a DG |
4194 | } |
4195 | ||
4196 | if (session->snapshot.nb_output == 0) { | |
4197 | ret = 0; | |
903ef685 | 4198 | goto end; |
6dc3064a DG |
4199 | } |
4200 | ||
64803277 | 4201 | list = calloc<lttng_snapshot_output>(session->snapshot.nb_output); |
6dc3064a | 4202 | if (!list) { |
b223ca94 | 4203 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 4204 | goto end; |
6dc3064a DG |
4205 | } |
4206 | ||
4207 | /* Copy list from session to the new list object. */ | |
b223ca94 | 4208 | rcu_read_lock(); |
6dc3064a DG |
4209 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter, |
4210 | output, node.node) { | |
a0377dfe | 4211 | LTTNG_ASSERT(output->consumer); |
6dc3064a DG |
4212 | list[idx].id = output->id; |
4213 | list[idx].max_size = output->max_size; | |
6ce22875 MD |
4214 | if (lttng_strncpy(list[idx].name, output->name, |
4215 | sizeof(list[idx].name))) { | |
4216 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 4217 | goto error; |
6ce22875 | 4218 | } |
6dc3064a | 4219 | if (output->consumer->type == CONSUMER_DST_LOCAL) { |
6ce22875 | 4220 | if (lttng_strncpy(list[idx].ctrl_url, |
366a9222 | 4221 | output->consumer->dst.session_root_path, |
6ce22875 MD |
4222 | sizeof(list[idx].ctrl_url))) { |
4223 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 4224 | goto error; |
6ce22875 | 4225 | } |
6dc3064a DG |
4226 | } else { |
4227 | /* Control URI. */ | |
4228 | ret = uri_to_str_url(&output->consumer->dst.net.control, | |
4229 | list[idx].ctrl_url, sizeof(list[idx].ctrl_url)); | |
4230 | if (ret < 0) { | |
b223ca94 | 4231 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 4232 | goto error; |
6dc3064a DG |
4233 | } |
4234 | ||
4235 | /* Data URI. */ | |
4236 | ret = uri_to_str_url(&output->consumer->dst.net.data, | |
4237 | list[idx].data_url, sizeof(list[idx].data_url)); | |
4238 | if (ret < 0) { | |
b223ca94 | 4239 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 4240 | goto error; |
6dc3064a DG |
4241 | } |
4242 | } | |
4243 | idx++; | |
4244 | } | |
4245 | ||
4246 | *outputs = list; | |
b223ca94 JG |
4247 | list = NULL; |
4248 | ret = session->snapshot.nb_output; | |
6dc3064a | 4249 | error: |
903ef685 | 4250 | rcu_read_unlock(); |
b223ca94 | 4251 | free(list); |
903ef685 | 4252 | end: |
b223ca94 | 4253 | return ret; |
6dc3064a DG |
4254 | } |
4255 | ||
93ec662e JD |
4256 | /* |
4257 | * Check if we can regenerate the metadata for this session. | |
4258 | * Only kernel, UST per-uid and non-live sessions are supported. | |
4259 | * | |
4260 | * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise. | |
4261 | */ | |
4262 | static | |
eded6438 | 4263 | int check_regenerate_metadata_support(struct ltt_session *session) |
93ec662e JD |
4264 | { |
4265 | int ret; | |
4266 | ||
a0377dfe | 4267 | LTTNG_ASSERT(session); |
93ec662e JD |
4268 | |
4269 | if (session->live_timer != 0) { | |
4270 | ret = LTTNG_ERR_LIVE_SESSION; | |
4271 | goto end; | |
4272 | } | |
4273 | if (!session->active) { | |
4274 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
4275 | goto end; | |
4276 | } | |
4277 | if (session->ust_session) { | |
4278 | switch (session->ust_session->buffer_type) { | |
4279 | case LTTNG_BUFFER_PER_UID: | |
4280 | break; | |
4281 | case LTTNG_BUFFER_PER_PID: | |
4282 | ret = LTTNG_ERR_PER_PID_SESSION; | |
4283 | goto end; | |
4284 | default: | |
a0377dfe | 4285 | abort(); |
93ec662e JD |
4286 | ret = LTTNG_ERR_UNK; |
4287 | goto end; | |
4288 | } | |
4289 | } | |
4290 | if (session->consumer->type == CONSUMER_DST_NET && | |
4291 | session->consumer->relay_minor_version < 8) { | |
4292 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; | |
4293 | goto end; | |
4294 | } | |
4295 | ret = 0; | |
4296 | ||
4297 | end: | |
4298 | return ret; | |
4299 | } | |
4300 | ||
93ec662e | 4301 | /* |
eded6438 | 4302 | * Command LTTNG_REGENERATE_METADATA from the lttng-ctl library. |
93ec662e JD |
4303 | * |
4304 | * Ask the consumer to truncate the existing metadata file(s) and | |
4305 | * then regenerate the metadata. Live and per-pid sessions are not | |
4306 | * supported and return an error. | |
4307 | * | |
1136f41b | 4308 | * Return LTTNG_OK on success or else a LTTNG_ERR code. |
93ec662e | 4309 | */ |
eded6438 | 4310 | int cmd_regenerate_metadata(struct ltt_session *session) |
93ec662e JD |
4311 | { |
4312 | int ret; | |
4313 | ||
a0377dfe | 4314 | LTTNG_ASSERT(session); |
93ec662e | 4315 | |
eded6438 | 4316 | ret = check_regenerate_metadata_support(session); |
93ec662e JD |
4317 | if (ret) { |
4318 | goto end; | |
4319 | } | |
4320 | ||
4321 | if (session->kernel_session) { | |
eded6438 | 4322 | ret = kernctl_session_regenerate_metadata( |
93ec662e JD |
4323 | session->kernel_session->fd); |
4324 | if (ret < 0) { | |
4325 | ERR("Failed to regenerate the kernel metadata"); | |
4326 | goto end; | |
4327 | } | |
4328 | } | |
4329 | ||
4330 | if (session->ust_session) { | |
d7bfb9b0 | 4331 | ret = trace_ust_regenerate_metadata(session->ust_session); |
93ec662e JD |
4332 | if (ret < 0) { |
4333 | ERR("Failed to regenerate the UST metadata"); | |
4334 | goto end; | |
4335 | } | |
4336 | } | |
4337 | DBG("Cmd metadata regenerate for session %s", session->name); | |
4338 | ret = LTTNG_OK; | |
4339 | ||
4340 | end: | |
4341 | return ret; | |
4342 | } | |
4343 | ||
c2561365 JD |
4344 | /* |
4345 | * Command LTTNG_REGENERATE_STATEDUMP from the lttng-ctl library. | |
4346 | * | |
4347 | * Ask the tracer to regenerate a new statedump. | |
4348 | * | |
1136f41b | 4349 | * Return LTTNG_OK on success or else a LTTNG_ERR code. |
c2561365 JD |
4350 | */ |
4351 | int cmd_regenerate_statedump(struct ltt_session *session) | |
4352 | { | |
4353 | int ret; | |
4354 | ||
a0377dfe | 4355 | LTTNG_ASSERT(session); |
c2561365 JD |
4356 | |
4357 | if (!session->active) { | |
4358 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
4359 | goto end; | |
4360 | } | |
c2561365 JD |
4361 | |
4362 | if (session->kernel_session) { | |
4363 | ret = kernctl_session_regenerate_statedump( | |
4364 | session->kernel_session->fd); | |
4365 | /* | |
4366 | * Currently, the statedump in kernel can only fail if out | |
4367 | * of memory. | |
4368 | */ | |
4369 | if (ret < 0) { | |
4370 | if (ret == -ENOMEM) { | |
4371 | ret = LTTNG_ERR_REGEN_STATEDUMP_NOMEM; | |
4372 | } else { | |
4373 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
4374 | } | |
4375 | ERR("Failed to regenerate the kernel statedump"); | |
4376 | goto end; | |
4377 | } | |
4378 | } | |
4379 | ||
4380 | if (session->ust_session) { | |
4381 | ret = ust_app_regenerate_statedump_all(session->ust_session); | |
4382 | /* | |
4383 | * Currently, the statedump in UST always returns 0. | |
4384 | */ | |
4385 | if (ret < 0) { | |
4386 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
4387 | ERR("Failed to regenerate the UST statedump"); | |
4388 | goto end; | |
4389 | } | |
4390 | } | |
4391 | DBG("Cmd regenerate statedump for session %s", session->name); | |
4392 | ret = LTTNG_OK; | |
4393 | ||
4394 | end: | |
4395 | return ret; | |
4396 | } | |
4397 | ||
989a0844 FD |
4398 | static |
4399 | enum lttng_error_code synchronize_tracer_notifier_register( | |
4400 | struct notification_thread_handle *notification_thread, | |
4401 | struct lttng_trigger *trigger, const struct lttng_credentials *cmd_creds) | |
70670472 | 4402 | { |
989a0844 | 4403 | enum lttng_error_code ret_code; |
7c1f6da2 JG |
4404 | const struct lttng_condition *condition = |
4405 | lttng_trigger_get_const_condition(trigger); | |
989a0844 FD |
4406 | const char *trigger_name; |
4407 | uid_t trigger_owner; | |
4408 | enum lttng_trigger_status trigger_status; | |
4409 | const enum lttng_domain_type trigger_domain = | |
4410 | lttng_trigger_get_underlying_domain_type_restriction( | |
4411 | trigger); | |
70670472 | 4412 | |
989a0844 | 4413 | trigger_status = lttng_trigger_get_owner_uid(trigger, &trigger_owner); |
a0377dfe | 4414 | LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK); |
989a0844 | 4415 | |
a0377dfe FD |
4416 | LTTNG_ASSERT(condition); |
4417 | LTTNG_ASSERT(lttng_condition_get_type(condition) == | |
8dbb86b8 | 4418 | LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES); |
989a0844 FD |
4419 | |
4420 | trigger_status = lttng_trigger_get_name(trigger, &trigger_name); | |
4421 | trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ? | |
0efb2ad7 | 4422 | trigger_name : "(anonymous)"; |
989a0844 FD |
4423 | |
4424 | session_lock_list(); | |
4425 | switch (trigger_domain) { | |
4426 | case LTTNG_DOMAIN_KERNEL: | |
4427 | { | |
4428 | ret_code = kernel_register_event_notifier(trigger, cmd_creds); | |
4429 | if (ret_code != LTTNG_OK) { | |
4430 | enum lttng_error_code notif_thread_unregister_ret; | |
4431 | ||
4432 | notif_thread_unregister_ret = | |
4433 | notification_thread_command_unregister_trigger( | |
4434 | notification_thread, trigger); | |
4435 | ||
4436 | if (notif_thread_unregister_ret != LTTNG_OK) { | |
4437 | /* Return the original error code. */ | |
4438 | ERR("Failed to unregister trigger from notification thread during error recovery: trigger name = '%s', trigger owner uid = %d, error code = %d", | |
4439 | trigger_name, | |
4440 | (int) trigger_owner, | |
4441 | ret_code); | |
4442 | } | |
4443 | } | |
4444 | break; | |
70670472 | 4445 | } |
989a0844 FD |
4446 | case LTTNG_DOMAIN_UST: |
4447 | ust_app_global_update_all_event_notifier_rules(); | |
4448 | break; | |
4449 | case LTTNG_DOMAIN_JUL: | |
4450 | case LTTNG_DOMAIN_LOG4J: | |
4451 | case LTTNG_DOMAIN_PYTHON: | |
4452 | { | |
4453 | /* Agent domains. */ | |
4454 | struct agent *agt = agent_find_by_event_notifier_domain( | |
4455 | trigger_domain); | |
70670472 | 4456 | |
989a0844 FD |
4457 | if (!agt) { |
4458 | agt = agent_create(trigger_domain); | |
4459 | if (!agt) { | |
4460 | ret_code = LTTNG_ERR_NOMEM; | |
4461 | goto end_unlock_session_list; | |
4462 | } | |
4463 | ||
412d7227 | 4464 | agent_add(agt, the_trigger_agents_ht_by_domain); |
989a0844 FD |
4465 | } |
4466 | ||
7966af57 | 4467 | ret_code = (lttng_error_code) trigger_agent_enable(trigger, agt); |
989a0844 FD |
4468 | if (ret_code != LTTNG_OK) { |
4469 | goto end_unlock_session_list; | |
4470 | } | |
4471 | ||
4472 | break; | |
4473 | } | |
4474 | case LTTNG_DOMAIN_NONE: | |
4475 | default: | |
4476 | abort(); | |
4477 | } | |
4478 | ||
4479 | ret_code = LTTNG_OK; | |
4480 | end_unlock_session_list: | |
4481 | session_unlock_list(); | |
70670472 JR |
4482 | return ret_code; |
4483 | } | |
4484 | ||
4485 | enum lttng_error_code cmd_register_trigger(const struct lttng_credentials *cmd_creds, | |
746e08d7 | 4486 | struct lttng_trigger *trigger, |
0efb2ad7 | 4487 | bool is_trigger_anonymous, |
242388e4 JR |
4488 | struct notification_thread_handle *notification_thread, |
4489 | struct lttng_trigger **return_trigger) | |
b0880ae5 | 4490 | { |
70670472 | 4491 | enum lttng_error_code ret_code; |
70670472 JR |
4492 | const char *trigger_name; |
4493 | uid_t trigger_owner; | |
4494 | enum lttng_trigger_status trigger_status; | |
4495 | ||
4496 | trigger_status = lttng_trigger_get_name(trigger, &trigger_name); | |
ce0b1d61 | 4497 | trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ? |
0efb2ad7 | 4498 | trigger_name : "(anonymous)"; |
ce0b1d61 | 4499 | |
70670472 JR |
4500 | trigger_status = lttng_trigger_get_owner_uid( |
4501 | trigger, &trigger_owner); | |
a0377dfe | 4502 | LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK); |
70670472 JR |
4503 | |
4504 | DBG("Running register trigger command: trigger name = '%s', trigger owner uid = %d, command creds uid = %d", | |
4505 | trigger_name, (int) trigger_owner, | |
4506 | (int) lttng_credentials_get_uid(cmd_creds)); | |
b0880ae5 | 4507 | |
64eafdf6 JR |
4508 | /* |
4509 | * Validate the trigger credentials against the command credentials. | |
4510 | * Only the root user can register a trigger with non-matching | |
4511 | * credentials. | |
4512 | */ | |
4513 | if (!lttng_credentials_is_equal_uid( | |
4514 | lttng_trigger_get_credentials(trigger), | |
746e08d7 JG |
4515 | cmd_creds)) { |
4516 | if (lttng_credentials_get_uid(cmd_creds) != 0) { | |
70670472 JR |
4517 | ERR("Trigger credentials do not match the command credentials: trigger name = '%s', trigger owner uid = %d, command creds uid = %d", |
4518 | trigger_name, (int) trigger_owner, | |
4519 | (int) lttng_credentials_get_uid(cmd_creds)); | |
4520 | ret_code = LTTNG_ERR_INVALID_TRIGGER; | |
64eafdf6 JR |
4521 | goto end; |
4522 | } | |
4523 | } | |
3da864a9 | 4524 | |
58daac01 JR |
4525 | /* |
4526 | * The bytecode generation also serves as a validation step for the | |
4527 | * bytecode expressions. | |
4528 | */ | |
70670472 JR |
4529 | ret_code = lttng_trigger_generate_bytecode(trigger, cmd_creds); |
4530 | if (ret_code != LTTNG_OK) { | |
4531 | ERR("Failed to generate bytecode of trigger: trigger name = '%s', trigger owner uid = %d, error code = %d", | |
4532 | trigger_name, (int) trigger_owner, ret_code); | |
58daac01 JR |
4533 | goto end; |
4534 | } | |
4535 | ||
242388e4 JR |
4536 | /* |
4537 | * A reference to the trigger is acquired by the notification thread. | |
4538 | * It is safe to return the same trigger to the caller since it the | |
4539 | * other user holds a reference. | |
4540 | * | |
4541 | * The trigger is modified during the execution of the | |
4542 | * "register trigger" command. However, by the time the command returns, | |
4543 | * it is safe to use without any locking as its properties are | |
4544 | * immutable. | |
4545 | */ | |
0efb2ad7 JG |
4546 | ret_code = notification_thread_command_register_trigger( |
4547 | notification_thread, trigger, is_trigger_anonymous); | |
70670472 | 4548 | if (ret_code != LTTNG_OK) { |
ce0b1d61 | 4549 | DBG("Failed to register trigger to notification thread: trigger name = '%s', trigger owner uid = %d, error code = %d", |
70670472 | 4550 | trigger_name, (int) trigger_owner, ret_code); |
44760c20 | 4551 | goto end; |
70670472 JR |
4552 | } |
4553 | ||
ce0b1d61 JG |
4554 | trigger_status = lttng_trigger_get_name(trigger, &trigger_name); |
4555 | trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ? | |
0efb2ad7 | 4556 | trigger_name : "(anonymous)"; |
ce0b1d61 | 4557 | |
70670472 JR |
4558 | /* |
4559 | * Synchronize tracers if the trigger adds an event notifier. | |
4560 | */ | |
989a0844 FD |
4561 | if (lttng_trigger_needs_tracer_notifier(trigger)) { |
4562 | ret_code = synchronize_tracer_notifier_register(notification_thread, | |
4563 | trigger, cmd_creds); | |
4564 | if (ret_code != LTTNG_OK) { | |
4565 | ERR("Error registering tracer notifier: %s", | |
4566 | lttng_strerror(-ret_code)); | |
4567 | goto end; | |
70670472 JR |
4568 | } |
4569 | } | |
4570 | ||
746e08d7 JG |
4571 | /* |
4572 | * Return an updated trigger to the client. | |
4573 | * | |
4574 | * Since a modified version of the same trigger is returned, acquire a | |
4575 | * reference to the trigger so the caller doesn't have to care if those | |
4576 | * are distinct instances or not. | |
4577 | */ | |
39b95a70 JG |
4578 | if (ret_code == LTTNG_OK) { |
4579 | lttng_trigger_get(trigger); | |
4580 | *return_trigger = trigger; | |
4581 | /* Ownership of trigger was transferred to caller. */ | |
4582 | trigger = NULL; | |
4583 | } | |
b0880ae5 | 4584 | end: |
70670472 | 4585 | return ret_code; |
989a0844 FD |
4586 | } |
4587 | ||
4588 | static | |
4589 | enum lttng_error_code synchronize_tracer_notifier_unregister( | |
4590 | const struct lttng_trigger *trigger) | |
4591 | { | |
4592 | enum lttng_error_code ret_code; | |
4593 | const struct lttng_condition *condition = | |
4594 | lttng_trigger_get_const_condition(trigger); | |
4595 | const enum lttng_domain_type trigger_domain = | |
4596 | lttng_trigger_get_underlying_domain_type_restriction( | |
4597 | trigger); | |
4598 | ||
a0377dfe FD |
4599 | LTTNG_ASSERT(condition); |
4600 | LTTNG_ASSERT(lttng_condition_get_type(condition) == | |
8dbb86b8 | 4601 | LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES); |
989a0844 FD |
4602 | |
4603 | session_lock_list(); | |
4604 | switch (trigger_domain) { | |
4605 | case LTTNG_DOMAIN_KERNEL: | |
4606 | ret_code = kernel_unregister_event_notifier(trigger); | |
e689039f JG |
4607 | if (ret_code != LTTNG_OK) { |
4608 | goto end_unlock_session_list; | |
4609 | } | |
4610 | ||
989a0844 FD |
4611 | break; |
4612 | case LTTNG_DOMAIN_UST: | |
4613 | ust_app_global_update_all_event_notifier_rules(); | |
4614 | break; | |
4615 | case LTTNG_DOMAIN_JUL: | |
4616 | case LTTNG_DOMAIN_LOG4J: | |
4617 | case LTTNG_DOMAIN_PYTHON: | |
4618 | { | |
4619 | /* Agent domains. */ | |
4620 | struct agent *agt = agent_find_by_event_notifier_domain( | |
4621 | trigger_domain); | |
4622 | ||
566190c4 JG |
4623 | /* |
4624 | * This trigger was never registered in the first place. Calling | |
4625 | * this function under those circumstances is an internal error. | |
4626 | */ | |
a0377dfe | 4627 | LTTNG_ASSERT(agt); |
7966af57 | 4628 | ret_code = (lttng_error_code) trigger_agent_disable(trigger, agt); |
989a0844 FD |
4629 | if (ret_code != LTTNG_OK) { |
4630 | goto end_unlock_session_list; | |
4631 | } | |
4632 | ||
4633 | break; | |
4634 | } | |
4635 | case LTTNG_DOMAIN_NONE: | |
4636 | default: | |
4637 | abort(); | |
4638 | } | |
4639 | ||
4640 | ret_code = LTTNG_OK; | |
4641 | ||
9b7cbebd JG |
4642 | end_unlock_session_list: |
4643 | session_unlock_list(); | |
4644 | return ret_code; | |
b0880ae5 JG |
4645 | } |
4646 | ||
70670472 | 4647 | enum lttng_error_code cmd_unregister_trigger(const struct lttng_credentials *cmd_creds, |
746e08d7 | 4648 | const struct lttng_trigger *trigger, |
b0880ae5 JG |
4649 | struct notification_thread_handle *notification_thread) |
4650 | { | |
70670472 | 4651 | enum lttng_error_code ret_code; |
70670472 JR |
4652 | const char *trigger_name; |
4653 | uid_t trigger_owner; | |
4654 | enum lttng_trigger_status trigger_status; | |
5c5373c3 | 4655 | struct lttng_trigger *sessiond_trigger = NULL; |
70670472 JR |
4656 | |
4657 | trigger_status = lttng_trigger_get_name(trigger, &trigger_name); | |
0efb2ad7 | 4658 | trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ? trigger_name : "(anonymous)"; |
989a0844 | 4659 | trigger_status = lttng_trigger_get_owner_uid(trigger, &trigger_owner); |
a0377dfe | 4660 | LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK); |
70670472 JR |
4661 | |
4662 | DBG("Running unregister trigger command: trigger name = '%s', trigger owner uid = %d, command creds uid = %d", | |
4663 | trigger_name, (int) trigger_owner, | |
4664 | (int) lttng_credentials_get_uid(cmd_creds)); | |
b0880ae5 | 4665 | |
64eafdf6 JR |
4666 | /* |
4667 | * Validate the trigger credentials against the command credentials. | |
4668 | * Only the root user can unregister a trigger with non-matching | |
4669 | * credentials. | |
4670 | */ | |
4671 | if (!lttng_credentials_is_equal_uid( | |
4672 | lttng_trigger_get_credentials(trigger), | |
746e08d7 JG |
4673 | cmd_creds)) { |
4674 | if (lttng_credentials_get_uid(cmd_creds) != 0) { | |
70670472 JR |
4675 | ERR("Trigger credentials do not match the command credentials: trigger name = '%s', trigger owner uid = %d, command creds uid = %d", |
4676 | trigger_name, (int) trigger_owner, | |
4677 | (int) lttng_credentials_get_uid(cmd_creds)); | |
4678 | ret_code = LTTNG_ERR_INVALID_TRIGGER; | |
64eafdf6 JR |
4679 | goto end; |
4680 | } | |
4681 | } | |
3da864a9 | 4682 | |
5c5373c3 JR |
4683 | /* Fetch the sessiond side trigger object. */ |
4684 | ret_code = notification_thread_command_get_trigger( | |
4685 | notification_thread, trigger, &sessiond_trigger); | |
4686 | if (ret_code != LTTNG_OK) { | |
4687 | DBG("Failed to get trigger from notification thread during unregister: trigger name = '%s', trigger owner uid = %d, error code = %d", | |
4688 | trigger_name, (int) trigger_owner, ret_code); | |
4689 | goto end; | |
4690 | } | |
4691 | ||
a0377dfe | 4692 | LTTNG_ASSERT(sessiond_trigger); |
5c5373c3 JR |
4693 | |
4694 | /* | |
4695 | * From this point on, no matter what, consider the trigger | |
4696 | * unregistered. | |
4697 | * | |
4698 | * We set the unregistered state of the sessiond side trigger object in | |
4699 | * the client thread since we want to minimize the possibility of the | |
4700 | * notification thread being stalled due to a long execution of an | |
4701 | * action that required the trigger lock. | |
4702 | */ | |
4703 | lttng_trigger_set_as_unregistered(sessiond_trigger); | |
4704 | ||
70670472 JR |
4705 | ret_code = notification_thread_command_unregister_trigger(notification_thread, |
4706 | trigger); | |
4707 | if (ret_code != LTTNG_OK) { | |
ce0b1d61 | 4708 | DBG("Failed to unregister trigger from notification thread: trigger name = '%s', trigger owner uid = %d, error code = %d", |
70670472 | 4709 | trigger_name, (int) trigger_owner, ret_code); |
13839b27 | 4710 | goto end; |
70670472 JR |
4711 | } |
4712 | ||
4713 | /* | |
4714 | * Synchronize tracers if the trigger removes an event notifier. | |
44760c20 JR |
4715 | * Do this even if the trigger unregistration failed to at least stop |
4716 | * the tracers from producing notifications associated with this | |
4717 | * event notifier. | |
70670472 | 4718 | */ |
989a0844 FD |
4719 | if (lttng_trigger_needs_tracer_notifier(trigger)) { |
4720 | ret_code = synchronize_tracer_notifier_unregister(trigger); | |
4721 | if (ret_code != LTTNG_OK) { | |
4722 | ERR("Error unregistering trigger to tracer."); | |
4723 | goto end; | |
70670472 | 4724 | } |
9b7cbebd | 4725 | |
70670472 JR |
4726 | } |
4727 | ||
b0880ae5 | 4728 | end: |
5c5373c3 | 4729 | lttng_trigger_put(sessiond_trigger); |
70670472 | 4730 | return ret_code; |
989a0844 | 4731 | } |
b0880ae5 | 4732 | |
ddd915a3 | 4733 | enum lttng_error_code cmd_list_triggers(struct command_ctx *cmd_ctx, |
fbc9f37d JR |
4734 | struct notification_thread_handle *notification_thread, |
4735 | struct lttng_triggers **return_triggers) | |
4736 | { | |
f2bda80e | 4737 | int ret; |
fbc9f37d JR |
4738 | enum lttng_error_code ret_code; |
4739 | struct lttng_triggers *triggers = NULL; | |
4740 | ||
4741 | /* Get the set of triggers from the notification thread. */ | |
4742 | ret_code = notification_thread_command_list_triggers( | |
4743 | notification_thread, cmd_ctx->creds.uid, &triggers); | |
4744 | if (ret_code != LTTNG_OK) { | |
fbc9f37d JR |
4745 | goto end; |
4746 | } | |
4747 | ||
f2bda80e JG |
4748 | ret = lttng_triggers_remove_hidden_triggers(triggers); |
4749 | if (ret) { | |
4750 | ret_code = LTTNG_ERR_UNK; | |
4751 | goto end; | |
4752 | } | |
4753 | ||
fbc9f37d JR |
4754 | *return_triggers = triggers; |
4755 | triggers = NULL; | |
ddd915a3 | 4756 | ret_code = LTTNG_OK; |
fbc9f37d JR |
4757 | end: |
4758 | lttng_triggers_destroy(triggers); | |
ddd915a3 | 4759 | return ret_code; |
fbc9f37d | 4760 | } |
588c4b0d JG |
4761 | |
4762 | enum lttng_error_code cmd_execute_error_query(const struct lttng_credentials *cmd_creds, | |
4763 | const struct lttng_error_query *query, | |
4764 | struct lttng_error_query_results **_results, | |
4765 | struct notification_thread_handle *notification_thread) | |
4766 | { | |
4767 | enum lttng_error_code ret_code; | |
4768 | const struct lttng_trigger *query_target_trigger; | |
63dd3d7b | 4769 | const struct lttng_action *query_target_action = NULL; |
588c4b0d JG |
4770 | struct lttng_trigger *matching_trigger = NULL; |
4771 | const char *trigger_name; | |
4772 | uid_t trigger_owner; | |
4773 | enum lttng_trigger_status trigger_status; | |
4774 | struct lttng_error_query_results *results = NULL; | |
4775 | ||
4776 | switch (lttng_error_query_get_target_type(query)) { | |
4777 | case LTTNG_ERROR_QUERY_TARGET_TYPE_TRIGGER: | |
4778 | query_target_trigger = lttng_error_query_trigger_borrow_target(query); | |
4779 | break; | |
63dd3d7b JG |
4780 | case LTTNG_ERROR_QUERY_TARGET_TYPE_CONDITION: |
4781 | query_target_trigger = | |
4782 | lttng_error_query_condition_borrow_target(query); | |
4783 | break; | |
588c4b0d JG |
4784 | case LTTNG_ERROR_QUERY_TARGET_TYPE_ACTION: |
4785 | query_target_trigger = lttng_error_query_action_borrow_trigger_target( | |
4786 | query); | |
4787 | break; | |
4788 | default: | |
4789 | abort(); | |
4790 | } | |
4791 | ||
a0377dfe | 4792 | LTTNG_ASSERT(query_target_trigger); |
588c4b0d JG |
4793 | |
4794 | ret_code = notification_thread_command_get_trigger(notification_thread, | |
4795 | query_target_trigger, &matching_trigger); | |
4796 | if (ret_code != LTTNG_OK) { | |
4797 | goto end; | |
4798 | } | |
4799 | ||
4800 | /* No longer needed. */ | |
4801 | query_target_trigger = NULL; | |
4802 | ||
4803 | if (lttng_error_query_get_target_type(query) == | |
4804 | LTTNG_ERROR_QUERY_TARGET_TYPE_ACTION) { | |
4805 | /* Get the sessiond-side version of the target action. */ | |
4806 | query_target_action = | |
4807 | lttng_error_query_action_borrow_action_target( | |
4808 | query, matching_trigger); | |
4809 | } | |
4810 | ||
4811 | trigger_status = lttng_trigger_get_name(matching_trigger, &trigger_name); | |
4812 | trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ? | |
0efb2ad7 | 4813 | trigger_name : "(anonymous)"; |
588c4b0d JG |
4814 | trigger_status = lttng_trigger_get_owner_uid(matching_trigger, |
4815 | &trigger_owner); | |
a0377dfe | 4816 | LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK); |
588c4b0d JG |
4817 | |
4818 | results = lttng_error_query_results_create(); | |
4819 | if (!results) { | |
4820 | ret_code = LTTNG_ERR_NOMEM; | |
4821 | goto end; | |
4822 | } | |
4823 | ||
4824 | DBG("Running \"execute error query\" command: trigger name = '%s', trigger owner uid = %d, command creds uid = %d", | |
4825 | trigger_name, (int) trigger_owner, | |
4826 | (int) lttng_credentials_get_uid(cmd_creds)); | |
4827 | ||
4828 | /* | |
4829 | * Validate the trigger credentials against the command credentials. | |
4830 | * Only the root user can target a trigger with non-matching | |
4831 | * credentials. | |
4832 | */ | |
4833 | if (!lttng_credentials_is_equal_uid( | |
4834 | lttng_trigger_get_credentials(matching_trigger), | |
4835 | cmd_creds)) { | |
4836 | if (lttng_credentials_get_uid(cmd_creds) != 0) { | |
4837 | ERR("Trigger credentials do not match the command credentials: trigger name = '%s', trigger owner uid = %d, command creds uid = %d", | |
4838 | trigger_name, (int) trigger_owner, | |
4839 | (int) lttng_credentials_get_uid(cmd_creds)); | |
4840 | ret_code = LTTNG_ERR_INVALID_TRIGGER; | |
4841 | goto end; | |
4842 | } | |
4843 | } | |
4844 | ||
4845 | switch (lttng_error_query_get_target_type(query)) { | |
4846 | case LTTNG_ERROR_QUERY_TARGET_TYPE_TRIGGER: | |
4847 | trigger_status = lttng_trigger_add_error_results( | |
4848 | matching_trigger, results); | |
4849 | ||
4850 | switch (trigger_status) { | |
4851 | case LTTNG_TRIGGER_STATUS_OK: | |
4852 | break; | |
4853 | default: | |
4854 | ret_code = LTTNG_ERR_UNK; | |
4855 | goto end; | |
4856 | } | |
4857 | ||
4858 | break; | |
63dd3d7b JG |
4859 | case LTTNG_ERROR_QUERY_TARGET_TYPE_CONDITION: |
4860 | { | |
4861 | trigger_status = lttng_trigger_condition_add_error_results( | |
4862 | matching_trigger, results); | |
4863 | ||
4864 | switch (trigger_status) { | |
4865 | case LTTNG_TRIGGER_STATUS_OK: | |
4866 | break; | |
4867 | default: | |
4868 | ret_code = LTTNG_ERR_UNK; | |
4869 | goto end; | |
4870 | } | |
4871 | ||
4872 | break; | |
4873 | } | |
588c4b0d JG |
4874 | case LTTNG_ERROR_QUERY_TARGET_TYPE_ACTION: |
4875 | { | |
4876 | const enum lttng_action_status action_status = | |
4877 | lttng_action_add_error_query_results( | |
4878 | query_target_action, results); | |
4879 | ||
4880 | switch (action_status) { | |
4881 | case LTTNG_ACTION_STATUS_OK: | |
4882 | break; | |
4883 | default: | |
4884 | ret_code = LTTNG_ERR_UNK; | |
4885 | goto end; | |
4886 | } | |
4887 | ||
4888 | break; | |
4889 | } | |
4890 | default: | |
ef4cf1d2 | 4891 | abort(); |
588c4b0d JG |
4892 | break; |
4893 | } | |
4894 | ||
4895 | *_results = results; | |
4896 | results = NULL; | |
4897 | ret_code = LTTNG_OK; | |
4898 | end: | |
4899 | lttng_trigger_put(matching_trigger); | |
4900 | lttng_error_query_results_destroy(results); | |
4901 | return ret_code; | |
4902 | } | |
4903 | ||
6dc3064a DG |
4904 | /* |
4905 | * Send relayd sockets from snapshot output to consumer. Ignore request if the | |
4906 | * snapshot output is *not* set with a remote destination. | |
4907 | * | |
9a654598 | 4908 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a | 4909 | */ |
9a654598 | 4910 | static enum lttng_error_code set_relayd_for_snapshot( |
348a81dc | 4911 | struct consumer_output *output, |
fb9a95c4 | 4912 | const struct ltt_session *session) |
6dc3064a | 4913 | { |
9a654598 | 4914 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
4915 | struct lttng_ht_iter iter; |
4916 | struct consumer_socket *socket; | |
1e791a74 | 4917 | LTTNG_OPTIONAL(uint64_t) current_chunk_id = {}; |
6fa5fe7c | 4918 | const char *base_path; |
6dc3064a | 4919 | |
a0377dfe FD |
4920 | LTTNG_ASSERT(output); |
4921 | LTTNG_ASSERT(session); | |
6dc3064a DG |
4922 | |
4923 | DBG2("Set relayd object from snapshot output"); | |
4924 | ||
1e791a74 | 4925 | if (session->current_trace_chunk) { |
348a81dc JG |
4926 | enum lttng_trace_chunk_status chunk_status = |
4927 | lttng_trace_chunk_get_id( | |
4928 | session->current_trace_chunk, | |
4929 | ¤t_chunk_id.value); | |
1e791a74 | 4930 | |
348a81dc | 4931 | if (chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK) { |
1e791a74 JG |
4932 | current_chunk_id.is_set = true; |
4933 | } else { | |
4934 | ERR("Failed to get current trace chunk id"); | |
4935 | status = LTTNG_ERR_UNK; | |
4936 | goto error; | |
4937 | } | |
4938 | } | |
4939 | ||
6dc3064a | 4940 | /* Ignore if snapshot consumer output is not network. */ |
348a81dc | 4941 | if (output->type != CONSUMER_DST_NET) { |
6dc3064a DG |
4942 | goto error; |
4943 | } | |
4944 | ||
6fa5fe7c MD |
4945 | /* |
4946 | * The snapshot record URI base path overrides the session | |
4947 | * base path. | |
4948 | */ | |
4949 | if (output->dst.net.control.subdir[0] != '\0') { | |
4950 | base_path = output->dst.net.control.subdir; | |
4951 | } else { | |
4952 | base_path = session->base_path; | |
4953 | } | |
4954 | ||
6dc3064a DG |
4955 | /* |
4956 | * For each consumer socket, create and send the relayd object of the | |
4957 | * snapshot output. | |
4958 | */ | |
4959 | rcu_read_lock(); | |
348a81dc | 4960 | cds_lfht_for_each_entry(output->socks->ht, &iter.iter, |
5eecee74 | 4961 | socket, node.node) { |
ecd0f96d | 4962 | pthread_mutex_lock(socket->lock); |
f46376a1 | 4963 | status = send_consumer_relayd_sockets(session->id, |
348a81dc | 4964 | output, socket, |
d3e2ba59 | 4965 | session->name, session->hostname, |
6fa5fe7c | 4966 | base_path, |
1e791a74 | 4967 | session->live_timer, |
db1da059 | 4968 | current_chunk_id.is_set ? ¤t_chunk_id.value : NULL, |
46ef2188 MD |
4969 | session->creation_time, |
4970 | session->name_contains_creation_time); | |
ecd0f96d | 4971 | pthread_mutex_unlock(socket->lock); |
9a654598 | 4972 | if (status != LTTNG_OK) { |
6dc3064a DG |
4973 | rcu_read_unlock(); |
4974 | goto error; | |
4975 | } | |
4976 | } | |
4977 | rcu_read_unlock(); | |
4978 | ||
4979 | error: | |
9a654598 | 4980 | return status; |
6dc3064a DG |
4981 | } |
4982 | ||
4983 | /* | |
4984 | * Record a kernel snapshot. | |
4985 | * | |
fac41e72 | 4986 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a | 4987 | */ |
fb9a95c4 JG |
4988 | static enum lttng_error_code record_kernel_snapshot( |
4989 | struct ltt_kernel_session *ksess, | |
348a81dc | 4990 | const struct consumer_output *output, |
fb9a95c4 | 4991 | const struct ltt_session *session, |
f46376a1 | 4992 | uint64_t nb_packets_per_stream) |
6dc3064a | 4993 | { |
9a654598 | 4994 | enum lttng_error_code status; |
6dc3064a | 4995 | |
a0377dfe FD |
4996 | LTTNG_ASSERT(ksess); |
4997 | LTTNG_ASSERT(output); | |
4998 | LTTNG_ASSERT(session); | |
6dc3064a | 4999 | |
348a81dc | 5000 | status = kernel_snapshot_record( |
f46376a1 | 5001 | ksess, output, nb_packets_per_stream); |
9a654598 | 5002 | return status; |
6dc3064a DG |
5003 | } |
5004 | ||
5005 | /* | |
5006 | * Record a UST snapshot. | |
5007 | * | |
9a654598 | 5008 | * Returns LTTNG_OK on success or a LTTNG_ERR error code. |
6dc3064a | 5009 | */ |
9a654598 | 5010 | static enum lttng_error_code record_ust_snapshot(struct ltt_ust_session *usess, |
348a81dc JG |
5011 | const struct consumer_output *output, |
5012 | const struct ltt_session *session, | |
f46376a1 | 5013 | uint64_t nb_packets_per_stream) |
6dc3064a | 5014 | { |
9a654598 | 5015 | enum lttng_error_code status; |
6dc3064a | 5016 | |
a0377dfe FD |
5017 | LTTNG_ASSERT(usess); |
5018 | LTTNG_ASSERT(output); | |
5019 | LTTNG_ASSERT(session); | |
6dc3064a | 5020 | |
348a81dc | 5021 | status = ust_app_snapshot_record( |
f46376a1 | 5022 | usess, output, nb_packets_per_stream); |
9a654598 | 5023 | return status; |
6dc3064a DG |
5024 | } |
5025 | ||
d07ceecd | 5026 | static |
fb9a95c4 JG |
5027 | uint64_t get_session_size_one_more_packet_per_stream( |
5028 | const struct ltt_session *session, uint64_t cur_nr_packets) | |
68808f4e | 5029 | { |
d07ceecd | 5030 | uint64_t tot_size = 0; |
68808f4e DG |
5031 | |
5032 | if (session->kernel_session) { | |
5033 | struct ltt_kernel_channel *chan; | |
fb9a95c4 JG |
5034 | const struct ltt_kernel_session *ksess = |
5035 | session->kernel_session; | |
68808f4e | 5036 | |
68808f4e | 5037 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
d07ceecd MD |
5038 | if (cur_nr_packets >= chan->channel->attr.num_subbuf) { |
5039 | /* | |
5040 | * Don't take channel into account if we | |
5041 | * already grab all its packets. | |
5042 | */ | |
5043 | continue; | |
68808f4e | 5044 | } |
d07ceecd MD |
5045 | tot_size += chan->channel->attr.subbuf_size |
5046 | * chan->stream_count; | |
68808f4e DG |
5047 | } |
5048 | } | |
5049 | ||
5050 | if (session->ust_session) { | |
fb9a95c4 | 5051 | const struct ltt_ust_session *usess = session->ust_session; |
68808f4e | 5052 | |
d07ceecd MD |
5053 | tot_size += ust_app_get_size_one_more_packet_per_stream(usess, |
5054 | cur_nr_packets); | |
68808f4e DG |
5055 | } |
5056 | ||
d07ceecd | 5057 | return tot_size; |
68808f4e DG |
5058 | } |
5059 | ||
5c786ded | 5060 | /* |
d07ceecd MD |
5061 | * Calculate the number of packets we can grab from each stream that |
5062 | * fits within the overall snapshot max size. | |
5063 | * | |
5064 | * Returns -1 on error, 0 means infinite number of packets, else > 0 is | |
5065 | * the number of packets per stream. | |
5066 | * | |
5067 | * TODO: this approach is not perfect: we consider the worse case | |
5068 | * (packet filling the sub-buffers) as an upper bound, but we could do | |
5069 | * better if we do this calculation while we actually grab the packet | |
5070 | * content: we would know how much padding we don't actually store into | |
5071 | * the file. | |
5072 | * | |
5073 | * This algorithm is currently bounded by the number of packets per | |
5074 | * stream. | |
5075 | * | |
5076 | * Since we call this algorithm before actually grabbing the data, it's | |
5077 | * an approximation: for instance, applications could appear/disappear | |
5078 | * in between this call and actually grabbing data. | |
5c786ded | 5079 | */ |
d07ceecd | 5080 | static |
fb9a95c4 JG |
5081 | int64_t get_session_nb_packets_per_stream(const struct ltt_session *session, |
5082 | uint64_t max_size) | |
5c786ded | 5083 | { |
d07ceecd MD |
5084 | int64_t size_left; |
5085 | uint64_t cur_nb_packets = 0; | |
5c786ded | 5086 | |
d07ceecd MD |
5087 | if (!max_size) { |
5088 | return 0; /* Infinite */ | |
5c786ded JD |
5089 | } |
5090 | ||
d07ceecd MD |
5091 | size_left = max_size; |
5092 | for (;;) { | |
5093 | uint64_t one_more_packet_tot_size; | |
5c786ded | 5094 | |
fb9a95c4 JG |
5095 | one_more_packet_tot_size = get_session_size_one_more_packet_per_stream( |
5096 | session, cur_nb_packets); | |
d07ceecd MD |
5097 | if (!one_more_packet_tot_size) { |
5098 | /* We are already grabbing all packets. */ | |
5099 | break; | |
5100 | } | |
5101 | size_left -= one_more_packet_tot_size; | |
5102 | if (size_left < 0) { | |
5103 | break; | |
5104 | } | |
5105 | cur_nb_packets++; | |
5c786ded | 5106 | } |
aecf2da5 | 5107 | if (!cur_nb_packets && size_left != max_size) { |
d07ceecd MD |
5108 | /* Not enough room to grab one packet of each stream, error. */ |
5109 | return -1; | |
5110 | } | |
5111 | return cur_nb_packets; | |
5c786ded JD |
5112 | } |
5113 | ||
fb9a95c4 | 5114 | static |
d2956687 | 5115 | enum lttng_error_code snapshot_record(struct ltt_session *session, |
f46376a1 | 5116 | const struct snapshot_output *snapshot_output) |
fb9a95c4 JG |
5117 | { |
5118 | int64_t nb_packets_per_stream; | |
d2956687 | 5119 | char snapshot_chunk_name[LTTNG_NAME_MAX]; |
348a81dc JG |
5120 | int ret; |
5121 | enum lttng_error_code ret_code = LTTNG_OK; | |
d2956687 | 5122 | struct lttng_trace_chunk *snapshot_trace_chunk; |
348a81dc JG |
5123 | struct consumer_output *original_ust_consumer_output = NULL; |
5124 | struct consumer_output *original_kernel_consumer_output = NULL; | |
5125 | struct consumer_output *snapshot_ust_consumer_output = NULL; | |
5126 | struct consumer_output *snapshot_kernel_consumer_output = NULL; | |
d2956687 | 5127 | |
348a81dc | 5128 | ret = snprintf(snapshot_chunk_name, sizeof(snapshot_chunk_name), |
d2956687 JG |
5129 | "%s-%s-%" PRIu64, |
5130 | snapshot_output->name, | |
5131 | snapshot_output->datetime, | |
5132 | snapshot_output->nb_snapshot); | |
348a81dc | 5133 | if (ret < 0 || ret >= sizeof(snapshot_chunk_name)) { |
d2956687 | 5134 | ERR("Failed to format snapshot name"); |
348a81dc JG |
5135 | ret_code = LTTNG_ERR_INVALID; |
5136 | goto error; | |
d2956687 JG |
5137 | } |
5138 | DBG("Recording snapshot \"%s\" for session \"%s\" with chunk name \"%s\"", | |
5139 | snapshot_output->name, session->name, | |
5140 | snapshot_chunk_name); | |
348a81dc JG |
5141 | if (!session->kernel_session && !session->ust_session) { |
5142 | ERR("Failed to record snapshot as no channels exist"); | |
5143 | ret_code = LTTNG_ERR_NO_CHANNEL; | |
5144 | goto error; | |
5145 | } | |
5146 | ||
5147 | if (session->kernel_session) { | |
5148 | original_kernel_consumer_output = | |
5149 | session->kernel_session->consumer; | |
5150 | snapshot_kernel_consumer_output = | |
5151 | consumer_copy_output(snapshot_output->consumer); | |
3b967712 MD |
5152 | strcpy(snapshot_kernel_consumer_output->chunk_path, |
5153 | snapshot_chunk_name); | |
bd666153 JR |
5154 | |
5155 | /* Copy the original domain subdir. */ | |
5156 | strcpy(snapshot_kernel_consumer_output->domain_subdir, | |
5157 | original_kernel_consumer_output->domain_subdir); | |
5158 | ||
348a81dc JG |
5159 | ret = consumer_copy_sockets(snapshot_kernel_consumer_output, |
5160 | original_kernel_consumer_output); | |
5161 | if (ret < 0) { | |
5162 | ERR("Failed to copy consumer sockets from snapshot output configuration"); | |
5163 | ret_code = LTTNG_ERR_NOMEM; | |
5164 | goto error; | |
5165 | } | |
5166 | ret_code = set_relayd_for_snapshot( | |
5167 | snapshot_kernel_consumer_output, session); | |
5168 | if (ret_code != LTTNG_OK) { | |
5169 | ERR("Failed to setup relay daemon for kernel tracer snapshot"); | |
5170 | goto error; | |
5171 | } | |
5172 | session->kernel_session->consumer = | |
5173 | snapshot_kernel_consumer_output; | |
5174 | } | |
5175 | if (session->ust_session) { | |
5176 | original_ust_consumer_output = session->ust_session->consumer; | |
5177 | snapshot_ust_consumer_output = | |
5178 | consumer_copy_output(snapshot_output->consumer); | |
3b967712 MD |
5179 | strcpy(snapshot_ust_consumer_output->chunk_path, |
5180 | snapshot_chunk_name); | |
bd666153 JR |
5181 | |
5182 | /* Copy the original domain subdir. */ | |
5183 | strcpy(snapshot_ust_consumer_output->domain_subdir, | |
5184 | original_ust_consumer_output->domain_subdir); | |
5185 | ||
348a81dc JG |
5186 | ret = consumer_copy_sockets(snapshot_ust_consumer_output, |
5187 | original_ust_consumer_output); | |
5188 | if (ret < 0) { | |
5189 | ERR("Failed to copy consumer sockets from snapshot output configuration"); | |
5190 | ret_code = LTTNG_ERR_NOMEM; | |
5191 | goto error; | |
5192 | } | |
5193 | ret_code = set_relayd_for_snapshot( | |
5194 | snapshot_ust_consumer_output, session); | |
5195 | if (ret_code != LTTNG_OK) { | |
5196 | ERR("Failed to setup relay daemon for userspace tracer snapshot"); | |
5197 | goto error; | |
5198 | } | |
5199 | session->ust_session->consumer = | |
5200 | snapshot_ust_consumer_output; | |
5201 | } | |
5202 | ||
d2956687 | 5203 | snapshot_trace_chunk = session_create_new_trace_chunk(session, |
348a81dc JG |
5204 | snapshot_kernel_consumer_output ?: |
5205 | snapshot_ust_consumer_output, | |
5206 | consumer_output_get_base_path( | |
5207 | snapshot_output->consumer), | |
d2956687 JG |
5208 | snapshot_chunk_name); |
5209 | if (!snapshot_trace_chunk) { | |
348a81dc JG |
5210 | ERR("Failed to create temporary trace chunk to record a snapshot of session \"%s\"", |
5211 | session->name); | |
5212 | ret_code = LTTNG_ERR_CREATE_DIR_FAIL; | |
5213 | goto error; | |
d2956687 | 5214 | } |
a0377dfe | 5215 | LTTNG_ASSERT(!session->current_trace_chunk); |
d2956687 JG |
5216 | ret = session_set_trace_chunk(session, snapshot_trace_chunk, NULL); |
5217 | lttng_trace_chunk_put(snapshot_trace_chunk); | |
5218 | snapshot_trace_chunk = NULL; | |
5219 | if (ret) { | |
348a81dc JG |
5220 | ERR("Failed to set temporary trace chunk to record a snapshot of session \"%s\"", |
5221 | session->name); | |
5222 | ret_code = LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER; | |
5223 | goto error; | |
d2956687 | 5224 | } |
fb9a95c4 JG |
5225 | |
5226 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
5227 | snapshot_output->max_size); | |
5228 | if (nb_packets_per_stream < 0) { | |
348a81dc | 5229 | ret_code = LTTNG_ERR_MAX_SIZE_INVALID; |
5151d412 | 5230 | goto error_close_trace_chunk; |
fb9a95c4 JG |
5231 | } |
5232 | ||
5233 | if (session->kernel_session) { | |
348a81dc JG |
5234 | ret_code = record_kernel_snapshot(session->kernel_session, |
5235 | snapshot_kernel_consumer_output, session, | |
f46376a1 | 5236 | nb_packets_per_stream); |
348a81dc | 5237 | if (ret_code != LTTNG_OK) { |
5151d412 | 5238 | goto error_close_trace_chunk; |
fb9a95c4 JG |
5239 | } |
5240 | } | |
5241 | ||
5242 | if (session->ust_session) { | |
348a81dc JG |
5243 | ret_code = record_ust_snapshot(session->ust_session, |
5244 | snapshot_ust_consumer_output, session, | |
f46376a1 | 5245 | nb_packets_per_stream); |
348a81dc | 5246 | if (ret_code != LTTNG_OK) { |
5151d412 | 5247 | goto error_close_trace_chunk; |
fb9a95c4 JG |
5248 | } |
5249 | } | |
d2956687 | 5250 | |
5151d412 | 5251 | error_close_trace_chunk: |
dbfee52c MD |
5252 | if (session_set_trace_chunk(session, NULL, &snapshot_trace_chunk)) { |
5253 | ERR("Failed to release the current trace chunk of session \"%s\"", | |
5254 | session->name); | |
5255 | ret_code = LTTNG_ERR_UNK; | |
5256 | } | |
5257 | ||
5258 | if (session_close_trace_chunk(session, snapshot_trace_chunk, | |
343defc2 | 5259 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION, NULL)) { |
d2956687 JG |
5260 | /* |
5261 | * Don't goto end; make sure the chunk is closed for the session | |
5262 | * to allow future snapshots. | |
5263 | */ | |
5264 | ERR("Failed to close snapshot trace chunk of session \"%s\"", | |
5265 | session->name); | |
348a81dc | 5266 | ret_code = LTTNG_ERR_CLOSE_TRACE_CHUNK_FAIL_CONSUMER; |
d2956687 | 5267 | } |
a49a9216 JG |
5268 | |
5269 | lttng_trace_chunk_put(snapshot_trace_chunk); | |
5270 | snapshot_trace_chunk = NULL; | |
348a81dc JG |
5271 | error: |
5272 | if (original_ust_consumer_output) { | |
5273 | session->ust_session->consumer = original_ust_consumer_output; | |
5274 | } | |
5275 | if (original_kernel_consumer_output) { | |
5276 | session->kernel_session->consumer = | |
5277 | original_kernel_consumer_output; | |
5278 | } | |
5279 | consumer_output_put(snapshot_ust_consumer_output); | |
5280 | consumer_output_put(snapshot_kernel_consumer_output); | |
5281 | return ret_code; | |
fb9a95c4 JG |
5282 | } |
5283 | ||
6dc3064a DG |
5284 | /* |
5285 | * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl. | |
5286 | * | |
5287 | * The wait parameter is ignored so this call always wait for the snapshot to | |
5288 | * complete before returning. | |
5289 | * | |
5290 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
5291 | */ | |
5292 | int cmd_snapshot_record(struct ltt_session *session, | |
f46376a1 MJ |
5293 | const struct lttng_snapshot_output *output, |
5294 | int wait __attribute__((unused))) | |
6dc3064a | 5295 | { |
9a654598 JG |
5296 | enum lttng_error_code cmd_ret = LTTNG_OK; |
5297 | int ret; | |
00e1dfc4 | 5298 | unsigned int snapshot_success = 0; |
10ba83fe | 5299 | char datetime[16]; |
2abe7969 | 5300 | struct snapshot_output *tmp_output = NULL; |
6dc3064a | 5301 | |
a0377dfe FD |
5302 | LTTNG_ASSERT(session); |
5303 | LTTNG_ASSERT(output); | |
6dc3064a DG |
5304 | |
5305 | DBG("Cmd snapshot record for session %s", session->name); | |
5306 | ||
10ba83fe JR |
5307 | /* Get the datetime for the snapshot output directory. */ |
5308 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", datetime, | |
5309 | sizeof(datetime)); | |
5310 | if (!ret) { | |
9a654598 | 5311 | cmd_ret = LTTNG_ERR_INVALID; |
10ba83fe JR |
5312 | goto error; |
5313 | } | |
5314 | ||
6dc3064a | 5315 | /* |
d3f14b8a MD |
5316 | * Permission denied to create an output if the session is not |
5317 | * set in no output mode. | |
6dc3064a DG |
5318 | */ |
5319 | if (session->output_traces) { | |
9a654598 | 5320 | cmd_ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
5321 | goto error; |
5322 | } | |
5323 | ||
5324 | /* The session needs to be started at least once. */ | |
8382cf6f | 5325 | if (!session->has_been_started) { |
9a654598 | 5326 | cmd_ret = LTTNG_ERR_START_SESSION_ONCE; |
6dc3064a DG |
5327 | goto error; |
5328 | } | |
5329 | ||
5330 | /* Use temporary output for the session. */ | |
ba45d9f0 | 5331 | if (*output->ctrl_url != '\0') { |
2abe7969 JG |
5332 | tmp_output = snapshot_output_alloc(); |
5333 | if (!tmp_output) { | |
5334 | cmd_ret = LTTNG_ERR_NOMEM; | |
5335 | goto error; | |
5336 | } | |
5337 | ||
b178f53e JG |
5338 | ret = snapshot_output_init(session, output->max_size, |
5339 | output->name, | |
5340 | output->ctrl_url, output->data_url, | |
5341 | session->consumer, | |
2abe7969 | 5342 | tmp_output, NULL); |
6dc3064a DG |
5343 | if (ret < 0) { |
5344 | if (ret == -ENOMEM) { | |
9a654598 | 5345 | cmd_ret = LTTNG_ERR_NOMEM; |
6dc3064a | 5346 | } else { |
9a654598 | 5347 | cmd_ret = LTTNG_ERR_INVALID; |
6dc3064a DG |
5348 | } |
5349 | goto error; | |
5350 | } | |
1bfe7328 | 5351 | /* Use the global session count for the temporary snapshot. */ |
2abe7969 | 5352 | tmp_output->nb_snapshot = session->snapshot.nb_snapshot; |
10ba83fe JR |
5353 | |
5354 | /* Use the global datetime */ | |
2abe7969 | 5355 | memcpy(tmp_output->datetime, datetime, sizeof(datetime)); |
f46376a1 | 5356 | cmd_ret = snapshot_record(session, tmp_output); |
fb9a95c4 | 5357 | if (cmd_ret != LTTNG_OK) { |
804c90a8 JR |
5358 | goto error; |
5359 | } | |
804c90a8 JR |
5360 | snapshot_success = 1; |
5361 | } else { | |
5362 | struct snapshot_output *sout; | |
5363 | struct lttng_ht_iter iter; | |
68808f4e | 5364 | |
804c90a8 JR |
5365 | rcu_read_lock(); |
5366 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
5367 | &iter.iter, sout, node.node) { | |
2abe7969 JG |
5368 | struct snapshot_output output_copy; |
5369 | ||
804c90a8 | 5370 | /* |
2abe7969 JG |
5371 | * Make a local copy of the output and override output |
5372 | * parameters with those provided as part of the | |
5373 | * command. | |
804c90a8 | 5374 | */ |
2abe7969 | 5375 | memcpy(&output_copy, sout, sizeof(output_copy)); |
1bfe7328 | 5376 | |
804c90a8 | 5377 | if (output->max_size != (uint64_t) -1ULL) { |
2abe7969 | 5378 | output_copy.max_size = output->max_size; |
6dc3064a | 5379 | } |
d07ceecd | 5380 | |
2abe7969 JG |
5381 | output_copy.nb_snapshot = session->snapshot.nb_snapshot; |
5382 | memcpy(output_copy.datetime, datetime, | |
5383 | sizeof(datetime)); | |
6dc3064a | 5384 | |
804c90a8 JR |
5385 | /* Use temporary name. */ |
5386 | if (*output->name != '\0') { | |
2abe7969 JG |
5387 | if (lttng_strncpy(output_copy.name, |
5388 | output->name, | |
5389 | sizeof(output_copy.name))) { | |
9a654598 | 5390 | cmd_ret = LTTNG_ERR_INVALID; |
cf3e357d MD |
5391 | rcu_read_unlock(); |
5392 | goto error; | |
5393 | } | |
804c90a8 | 5394 | } |
e1986656 | 5395 | |
f46376a1 | 5396 | cmd_ret = snapshot_record(session, &output_copy); |
fb9a95c4 JG |
5397 | if (cmd_ret != LTTNG_OK) { |
5398 | rcu_read_unlock(); | |
5399 | goto error; | |
6dc3064a | 5400 | } |
804c90a8 | 5401 | snapshot_success = 1; |
6dc3064a | 5402 | } |
804c90a8 | 5403 | rcu_read_unlock(); |
6dc3064a DG |
5404 | } |
5405 | ||
1bfe7328 DG |
5406 | if (snapshot_success) { |
5407 | session->snapshot.nb_snapshot++; | |
b67578cb | 5408 | } else { |
9a654598 | 5409 | cmd_ret = LTTNG_ERR_SNAPSHOT_FAIL; |
1bfe7328 DG |
5410 | } |
5411 | ||
6dc3064a | 5412 | error: |
2abe7969 JG |
5413 | if (tmp_output) { |
5414 | snapshot_output_destroy(tmp_output); | |
5415 | } | |
9a654598 | 5416 | return cmd_ret; |
6dc3064a DG |
5417 | } |
5418 | ||
d7ba1388 MD |
5419 | /* |
5420 | * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread. | |
5421 | */ | |
5422 | int cmd_set_session_shm_path(struct ltt_session *session, | |
5423 | const char *shm_path) | |
5424 | { | |
5425 | /* Safety net */ | |
a0377dfe | 5426 | LTTNG_ASSERT(session); |
d7ba1388 MD |
5427 | |
5428 | /* | |
5429 | * Can only set shm path before session is started. | |
5430 | */ | |
5431 | if (session->has_been_started) { | |
5432 | return LTTNG_ERR_SESSION_STARTED; | |
5433 | } | |
5434 | ||
5435 | strncpy(session->shm_path, shm_path, | |
5436 | sizeof(session->shm_path)); | |
5437 | session->shm_path[sizeof(session->shm_path) - 1] = '\0'; | |
5438 | ||
7e397c55 | 5439 | return LTTNG_OK; |
d7ba1388 MD |
5440 | } |
5441 | ||
5c408ad8 JD |
5442 | /* |
5443 | * Command LTTNG_ROTATE_SESSION from the lttng-ctl library. | |
5444 | * | |
5445 | * Ask the consumer to rotate the session output directory. | |
5446 | * The session lock must be held. | |
5447 | * | |
d5a1b7aa | 5448 | * Returns LTTNG_OK on success or else a negative LTTng error code. |
5c408ad8 JD |
5449 | */ |
5450 | int cmd_rotate_session(struct ltt_session *session, | |
7fdbed1c | 5451 | struct lttng_rotate_session_return *rotate_return, |
343defc2 MD |
5452 | bool quiet_rotation, |
5453 | enum lttng_trace_chunk_command_type command) | |
5c408ad8 JD |
5454 | { |
5455 | int ret; | |
d2956687 | 5456 | uint64_t ongoing_rotation_chunk_id; |
d5a1b7aa | 5457 | enum lttng_error_code cmd_ret = LTTNG_OK; |
d2956687 JG |
5458 | struct lttng_trace_chunk *chunk_being_archived = NULL; |
5459 | struct lttng_trace_chunk *new_trace_chunk = NULL; | |
5460 | enum lttng_trace_chunk_status chunk_status; | |
3156892b JG |
5461 | bool failed_to_rotate = false; |
5462 | enum lttng_error_code rotation_fail_code = LTTNG_OK; | |
5c408ad8 | 5463 | |
a0377dfe | 5464 | LTTNG_ASSERT(session); |
5c408ad8 JD |
5465 | |
5466 | if (!session->has_been_started) { | |
d5a1b7aa | 5467 | cmd_ret = LTTNG_ERR_START_SESSION_ONCE; |
d68c9a04 | 5468 | goto end; |
5c408ad8 JD |
5469 | } |
5470 | ||
d48d65e1 MD |
5471 | /* |
5472 | * Explicit rotation is not supported for live sessions. | |
5473 | * However, live sessions can perform a quiet rotation on | |
5474 | * destroy. | |
5475 | * Rotation is not supported for snapshot traces (no output). | |
5476 | */ | |
5477 | if ((!quiet_rotation && session->live_timer) || | |
5478 | !session->output_traces) { | |
d5a1b7aa | 5479 | cmd_ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE; |
d68c9a04 | 5480 | goto end; |
5c408ad8 JD |
5481 | } |
5482 | ||
d2956687 | 5483 | /* Unsupported feature in lttng-relayd before 2.11. */ |
070b6a86 | 5484 | if (!quiet_rotation && session->consumer->type == CONSUMER_DST_NET && |
5c408ad8 JD |
5485 | (session->consumer->relay_major_version == 2 && |
5486 | session->consumer->relay_minor_version < 11)) { | |
d5a1b7aa | 5487 | cmd_ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE_RELAY; |
d68c9a04 | 5488 | goto end; |
5c408ad8 JD |
5489 | } |
5490 | ||
a40a503f MD |
5491 | /* Unsupported feature in lttng-modules before 2.8 (lack of sequence number). */ |
5492 | if (session->kernel_session && !kernel_supports_ring_buffer_packet_sequence_number()) { | |
5493 | cmd_ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE_KERNEL; | |
5494 | goto end; | |
5495 | } | |
5496 | ||
92816cc3 | 5497 | if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) { |
92816cc3 JG |
5498 | DBG("Refusing to launch a rotation; a rotation is already in progress for session %s", |
5499 | session->name); | |
d5a1b7aa | 5500 | cmd_ret = LTTNG_ERR_ROTATION_PENDING; |
d68c9a04 | 5501 | goto end; |
5c408ad8 JD |
5502 | } |
5503 | ||
5504 | /* | |
5505 | * After a stop, we only allow one rotation to occur, the other ones are | |
5506 | * useless until a new start. | |
5507 | */ | |
5508 | if (session->rotated_after_last_stop) { | |
5509 | DBG("Session \"%s\" was already rotated after stop, refusing rotation", | |
5510 | session->name); | |
d5a1b7aa | 5511 | cmd_ret = LTTNG_ERR_ROTATION_MULTIPLE_AFTER_STOP; |
d68c9a04 | 5512 | goto end; |
5c408ad8 | 5513 | } |
b02f5986 MD |
5514 | |
5515 | /* | |
5516 | * After a stop followed by a clear, disallow following rotations a they would | |
5517 | * generate empty chunks. | |
5518 | */ | |
5519 | if (session->cleared_after_last_stop) { | |
5520 | DBG("Session \"%s\" was already cleared after stop, refusing rotation", | |
5521 | session->name); | |
5522 | cmd_ret = LTTNG_ERR_ROTATION_AFTER_STOP_CLEAR; | |
5523 | goto end; | |
5524 | } | |
5525 | ||
d2956687 | 5526 | if (session->active) { |
348a81dc | 5527 | new_trace_chunk = session_create_new_trace_chunk(session, NULL, |
d2956687 JG |
5528 | NULL, NULL); |
5529 | if (!new_trace_chunk) { | |
5530 | cmd_ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
5531 | goto error; | |
5c408ad8 | 5532 | } |
0e270a1e | 5533 | } |
2961f09e | 5534 | |
3156892b JG |
5535 | /* |
5536 | * The current trace chunk becomes the chunk being archived. | |
5537 | * | |
5538 | * After this point, "chunk_being_archived" must absolutely | |
5539 | * be closed on the consumer(s), otherwise it will never be | |
5540 | * cleaned-up, which will result in a leak. | |
5541 | */ | |
d2956687 JG |
5542 | ret = session_set_trace_chunk(session, new_trace_chunk, |
5543 | &chunk_being_archived); | |
5544 | if (ret) { | |
5545 | cmd_ret = LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER; | |
b178f53e JG |
5546 | goto error; |
5547 | } | |
5548 | ||
5c408ad8 | 5549 | if (session->kernel_session) { |
d5a1b7aa JG |
5550 | cmd_ret = kernel_rotate_session(session); |
5551 | if (cmd_ret != LTTNG_OK) { | |
3156892b JG |
5552 | failed_to_rotate = true; |
5553 | rotation_fail_code = cmd_ret; | |
5c408ad8 JD |
5554 | } |
5555 | } | |
5556 | if (session->ust_session) { | |
d5a1b7aa JG |
5557 | cmd_ret = ust_app_rotate_session(session); |
5558 | if (cmd_ret != LTTNG_OK) { | |
3156892b JG |
5559 | failed_to_rotate = true; |
5560 | rotation_fail_code = cmd_ret; | |
5c408ad8 | 5561 | } |
92816cc3 | 5562 | } |
17dd1232 | 5563 | |
3b61d9ee JG |
5564 | if (!session->active) { |
5565 | session->rotated_after_last_stop = true; | |
5566 | } | |
5567 | ||
5568 | if (!chunk_being_archived) { | |
5569 | DBG("Rotating session \"%s\" from a \"NULL\" trace chunk to a new trace chunk, skipping completion check", | |
5570 | session->name); | |
5571 | if (failed_to_rotate) { | |
5572 | cmd_ret = rotation_fail_code; | |
5573 | goto error; | |
5574 | } | |
5575 | cmd_ret = LTTNG_OK; | |
5576 | goto end; | |
5577 | } | |
5578 | ||
5579 | session->rotation_state = LTTNG_ROTATION_STATE_ONGOING; | |
5580 | chunk_status = lttng_trace_chunk_get_id(chunk_being_archived, | |
5581 | &ongoing_rotation_chunk_id); | |
a0377dfe | 5582 | LTTNG_ASSERT(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); |
3b61d9ee | 5583 | |
bbc4768c | 5584 | ret = session_close_trace_chunk(session, chunk_being_archived, |
343defc2 | 5585 | command, session->last_chunk_path); |
d2956687 JG |
5586 | if (ret) { |
5587 | cmd_ret = LTTNG_ERR_CLOSE_TRACE_CHUNK_FAIL_CONSUMER; | |
5588 | goto error; | |
5589 | } | |
5590 | ||
3156892b JG |
5591 | if (failed_to_rotate) { |
5592 | cmd_ret = rotation_fail_code; | |
5593 | goto error; | |
5594 | } | |
5595 | ||
7fdbed1c | 5596 | session->quiet_rotation = quiet_rotation; |
92816cc3 JG |
5597 | ret = timer_session_rotation_pending_check_start(session, |
5598 | DEFAULT_ROTATE_PENDING_TIMER); | |
5599 | if (ret) { | |
d5a1b7aa | 5600 | cmd_ret = LTTNG_ERR_UNK; |
2961f09e | 5601 | goto error; |
5c408ad8 JD |
5602 | } |
5603 | ||
5c408ad8 | 5604 | if (rotate_return) { |
d2956687 | 5605 | rotate_return->rotation_id = ongoing_rotation_chunk_id; |
5c408ad8 JD |
5606 | } |
5607 | ||
d2956687 JG |
5608 | session->chunk_being_archived = chunk_being_archived; |
5609 | chunk_being_archived = NULL; | |
7fdbed1c JG |
5610 | if (!quiet_rotation) { |
5611 | ret = notification_thread_command_session_rotation_ongoing( | |
412d7227 SM |
5612 | the_notification_thread_handle, session->name, |
5613 | session->uid, session->gid, | |
7fdbed1c JG |
5614 | ongoing_rotation_chunk_id); |
5615 | if (ret != LTTNG_OK) { | |
5616 | ERR("Failed to notify notification thread that a session rotation is ongoing for session %s", | |
5617 | session->name); | |
7966af57 | 5618 | cmd_ret = (lttng_error_code) ret; |
7fdbed1c | 5619 | } |
2961f09e JG |
5620 | } |
5621 | ||
92816cc3 | 5622 | DBG("Cmd rotate session %s, archive_id %" PRIu64 " sent", |
d2956687 | 5623 | session->name, ongoing_rotation_chunk_id); |
5c408ad8 | 5624 | end: |
d2956687 JG |
5625 | lttng_trace_chunk_put(new_trace_chunk); |
5626 | lttng_trace_chunk_put(chunk_being_archived); | |
d5a1b7aa | 5627 | ret = (cmd_ret == LTTNG_OK) ? cmd_ret : -((int) cmd_ret); |
5c408ad8 | 5628 | return ret; |
2961f09e | 5629 | error: |
2961f09e | 5630 | if (session_reset_rotation_state(session, |
d2956687 | 5631 | LTTNG_ROTATION_STATE_ERROR)) { |
2961f09e JG |
5632 | ERR("Failed to reset rotation state of session \"%s\"", |
5633 | session->name); | |
5634 | } | |
5635 | goto end; | |
5c408ad8 JD |
5636 | } |
5637 | ||
5638 | /* | |
d68c9a04 | 5639 | * Command LTTNG_ROTATION_GET_INFO from the lttng-ctl library. |
5c408ad8 JD |
5640 | * |
5641 | * Check if the session has finished its rotation. | |
5642 | * | |
d2956687 | 5643 | * Return LTTNG_OK on success or else an LTTNG_ERR code. |
5c408ad8 | 5644 | */ |
d68c9a04 JD |
5645 | int cmd_rotate_get_info(struct ltt_session *session, |
5646 | struct lttng_rotation_get_info_return *info_return, | |
5647 | uint64_t rotation_id) | |
5c408ad8 | 5648 | { |
d2956687 JG |
5649 | enum lttng_error_code cmd_ret = LTTNG_OK; |
5650 | enum lttng_rotation_state rotation_state; | |
5c408ad8 | 5651 | |
d68c9a04 | 5652 | DBG("Cmd rotate_get_info session %s, rotation id %" PRIu64, session->name, |
d2956687 | 5653 | session->most_recent_chunk_id.value); |
5c408ad8 | 5654 | |
d2956687 JG |
5655 | if (session->chunk_being_archived) { |
5656 | enum lttng_trace_chunk_status chunk_status; | |
5657 | uint64_t chunk_id; | |
5658 | ||
5659 | chunk_status = lttng_trace_chunk_get_id( | |
5660 | session->chunk_being_archived, | |
5661 | &chunk_id); | |
a0377dfe | 5662 | LTTNG_ASSERT(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); |
d2956687 JG |
5663 | |
5664 | rotation_state = rotation_id == chunk_id ? | |
5665 | LTTNG_ROTATION_STATE_ONGOING : | |
5666 | LTTNG_ROTATION_STATE_EXPIRED; | |
5667 | } else { | |
5668 | if (session->last_archived_chunk_id.is_set && | |
5669 | rotation_id != session->last_archived_chunk_id.value) { | |
5670 | rotation_state = LTTNG_ROTATION_STATE_EXPIRED; | |
5671 | } else { | |
5672 | rotation_state = session->rotation_state; | |
5673 | } | |
5c408ad8 JD |
5674 | } |
5675 | ||
d2956687 JG |
5676 | switch (rotation_state) { |
5677 | case LTTNG_ROTATION_STATE_NO_ROTATION: | |
83ed9e90 | 5678 | DBG("Reporting that no rotation has occurred within the lifetime of session \"%s\"", |
d2956687 JG |
5679 | session->name); |
5680 | goto end; | |
5681 | case LTTNG_ROTATION_STATE_EXPIRED: | |
5682 | DBG("Reporting that the rotation state of rotation id %" PRIu64 " of session \"%s\" has expired", | |
5683 | rotation_id, session->name); | |
5684 | break; | |
d68c9a04 | 5685 | case LTTNG_ROTATION_STATE_ONGOING: |
d2956687 | 5686 | DBG("Reporting that rotation id %" PRIu64 " of session \"%s\" is still pending", |
d68c9a04 JD |
5687 | rotation_id, session->name); |
5688 | break; | |
5689 | case LTTNG_ROTATION_STATE_COMPLETED: | |
dd73d57b | 5690 | { |
d2956687 JG |
5691 | int fmt_ret; |
5692 | char *chunk_path; | |
dd73d57b JG |
5693 | char *current_tracing_path_reply; |
5694 | size_t current_tracing_path_reply_len; | |
5695 | ||
d2956687 JG |
5696 | DBG("Reporting that rotation id %" PRIu64 " of session \"%s\" is completed", |
5697 | rotation_id, session->name); | |
5698 | ||
dd73d57b JG |
5699 | switch (session_get_consumer_destination_type(session)) { |
5700 | case CONSUMER_DST_LOCAL: | |
5701 | current_tracing_path_reply = | |
5702 | info_return->location.local.absolute_path; | |
5703 | current_tracing_path_reply_len = | |
5704 | sizeof(info_return->location.local.absolute_path); | |
5705 | info_return->location_type = | |
05f8afa9 | 5706 | (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_LOCAL; |
ecd1a12f MD |
5707 | fmt_ret = asprintf(&chunk_path, |
5708 | "%s/" DEFAULT_ARCHIVED_TRACE_CHUNKS_DIRECTORY "/%s", | |
5709 | session_get_base_path(session), | |
5710 | session->last_archived_chunk_name); | |
5711 | if (fmt_ret == -1) { | |
5712 | PERROR("Failed to format the path of the last archived trace chunk"); | |
5713 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; | |
5714 | cmd_ret = LTTNG_ERR_UNK; | |
5715 | goto end; | |
5716 | } | |
dd73d57b JG |
5717 | break; |
5718 | case CONSUMER_DST_NET: | |
09cfbe47 JG |
5719 | { |
5720 | uint16_t ctrl_port, data_port; | |
5721 | ||
dd73d57b JG |
5722 | current_tracing_path_reply = |
5723 | info_return->location.relay.relative_path; | |
5724 | current_tracing_path_reply_len = | |
5725 | sizeof(info_return->location.relay.relative_path); | |
5726 | /* Currently the only supported relay protocol. */ | |
5727 | info_return->location.relay.protocol = | |
05f8afa9 | 5728 | (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_RELAY_PROTOCOL_TYPE_TCP; |
dd73d57b | 5729 | |
d2956687 | 5730 | fmt_ret = lttng_strncpy(info_return->location.relay.host, |
dd73d57b JG |
5731 | session_get_net_consumer_hostname(session), |
5732 | sizeof(info_return->location.relay.host)); | |
d2956687 JG |
5733 | if (fmt_ret) { |
5734 | ERR("Failed to copy host name to rotate_get_info reply"); | |
dd73d57b | 5735 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; |
d2956687 | 5736 | cmd_ret = LTTNG_ERR_SET_URL; |
dd73d57b JG |
5737 | goto end; |
5738 | } | |
5739 | ||
09cfbe47 JG |
5740 | session_get_net_consumer_ports(session, &ctrl_port, &data_port); |
5741 | info_return->location.relay.ports.control = ctrl_port; | |
5742 | info_return->location.relay.ports.data = data_port; | |
dd73d57b | 5743 | info_return->location_type = |
05f8afa9 | 5744 | (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_RELAY; |
ecd1a12f MD |
5745 | chunk_path = strdup(session->last_chunk_path); |
5746 | if (!chunk_path) { | |
5747 | ERR("Failed to allocate the path of the last archived trace chunk"); | |
5748 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; | |
5749 | cmd_ret = LTTNG_ERR_UNK; | |
5750 | goto end; | |
5751 | } | |
dd73d57b | 5752 | break; |
09cfbe47 | 5753 | } |
dd73d57b JG |
5754 | default: |
5755 | abort(); | |
5756 | } | |
d2956687 JG |
5757 | |
5758 | fmt_ret = lttng_strncpy(current_tracing_path_reply, | |
5759 | chunk_path, current_tracing_path_reply_len); | |
5760 | free(chunk_path); | |
5761 | if (fmt_ret) { | |
5762 | ERR("Failed to copy path of the last archived trace chunk to rotate_get_info reply"); | |
d68c9a04 | 5763 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; |
d2956687 | 5764 | cmd_ret = LTTNG_ERR_UNK; |
5c408ad8 JD |
5765 | goto end; |
5766 | } | |
dd73d57b | 5767 | |
d68c9a04 | 5768 | break; |
dd73d57b | 5769 | } |
d68c9a04 | 5770 | case LTTNG_ROTATION_STATE_ERROR: |
d2956687 | 5771 | DBG("Reporting that an error occurred during rotation %" PRIu64 " of session \"%s\"", |
d68c9a04 JD |
5772 | rotation_id, session->name); |
5773 | break; | |
5774 | default: | |
5775 | abort(); | |
5c408ad8 JD |
5776 | } |
5777 | ||
d2956687 | 5778 | cmd_ret = LTTNG_OK; |
5c408ad8 | 5779 | end: |
d2956687 JG |
5780 | info_return->status = (int32_t) rotation_state; |
5781 | return cmd_ret; | |
5c408ad8 JD |
5782 | } |
5783 | ||
259c2674 JD |
5784 | /* |
5785 | * Command LTTNG_ROTATION_SET_SCHEDULE from the lttng-ctl library. | |
5786 | * | |
5787 | * Configure the automatic rotation parameters. | |
66ea93b1 JG |
5788 | * 'activate' to true means activate the rotation schedule type with 'new_value'. |
5789 | * 'activate' to false means deactivate the rotation schedule and validate that | |
5790 | * 'new_value' has the same value as the currently active value. | |
259c2674 | 5791 | * |
1136f41b | 5792 | * Return LTTNG_OK on success or else a positive LTTNG_ERR code. |
259c2674 JD |
5793 | */ |
5794 | int cmd_rotation_set_schedule(struct ltt_session *session, | |
66ea93b1 JG |
5795 | bool activate, enum lttng_rotation_schedule_type schedule_type, |
5796 | uint64_t new_value, | |
90936dcf | 5797 | struct notification_thread_handle *notification_thread_handle) |
259c2674 JD |
5798 | { |
5799 | int ret; | |
66ea93b1 | 5800 | uint64_t *parameter_value; |
259c2674 | 5801 | |
a0377dfe | 5802 | LTTNG_ASSERT(session); |
259c2674 JD |
5803 | |
5804 | DBG("Cmd rotate set schedule session %s", session->name); | |
5805 | ||
92fe5ca1 | 5806 | if (session->live_timer || !session->output_traces) { |
66ea93b1 | 5807 | DBG("Failing ROTATION_SET_SCHEDULE command as the rotation feature is not available for this session"); |
259c2674 JD |
5808 | ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE; |
5809 | goto end; | |
5810 | } | |
5811 | ||
66ea93b1 JG |
5812 | switch (schedule_type) { |
5813 | case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD: | |
5814 | parameter_value = &session->rotate_size; | |
5815 | break; | |
5816 | case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC: | |
5817 | parameter_value = &session->rotate_timer_period; | |
5818 | if (new_value >= UINT_MAX) { | |
5819 | DBG("Failing ROTATION_SET_SCHEDULE command as the value requested for a periodic rotation schedule is invalid: %" PRIu64 " > %u (UINT_MAX)", | |
5820 | new_value, UINT_MAX); | |
5821 | ret = LTTNG_ERR_INVALID; | |
5822 | goto end; | |
5823 | } | |
5824 | break; | |
5825 | default: | |
5826 | WARN("Failing ROTATION_SET_SCHEDULE command on unknown schedule type"); | |
5827 | ret = LTTNG_ERR_INVALID; | |
259c2674 | 5828 | goto end; |
66ea93b1 JG |
5829 | } |
5830 | ||
5831 | /* Improper use of the API. */ | |
5832 | if (new_value == -1ULL) { | |
5833 | WARN("Failing ROTATION_SET_SCHEDULE command as the value requested is -1"); | |
5834 | ret = LTTNG_ERR_INVALID; | |
259c2674 JD |
5835 | goto end; |
5836 | } | |
5837 | ||
66ea93b1 JG |
5838 | /* |
5839 | * As indicated in struct ltt_session's comments, a value of == 0 means | |
5840 | * this schedule rotation type is not in use. | |
5841 | * | |
5842 | * Reject the command if we were asked to activate a schedule that was | |
5843 | * already active. | |
5844 | */ | |
5845 | if (activate && *parameter_value != 0) { | |
5846 | DBG("Failing ROTATION_SET_SCHEDULE (activate) command as the schedule is already active"); | |
5847 | ret = LTTNG_ERR_ROTATION_SCHEDULE_SET; | |
90936dcf | 5848 | goto end; |
66ea93b1 JG |
5849 | } |
5850 | ||
5851 | /* | |
5852 | * Reject the command if we were asked to deactivate a schedule that was | |
5853 | * not active. | |
5854 | */ | |
5855 | if (!activate && *parameter_value == 0) { | |
5856 | DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as the schedule is already inactive"); | |
5857 | ret = LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET; | |
90936dcf JD |
5858 | goto end; |
5859 | } | |
5860 | ||
66ea93b1 JG |
5861 | /* |
5862 | * Reject the command if we were asked to deactivate a schedule that | |
5863 | * doesn't exist. | |
5864 | */ | |
5865 | if (!activate && *parameter_value != new_value) { | |
5866 | DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as an inexistant schedule was provided"); | |
5867 | ret = LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET; | |
5868 | goto end; | |
5869 | } | |
259c2674 | 5870 | |
66ea93b1 JG |
5871 | *parameter_value = activate ? new_value : 0; |
5872 | ||
5873 | switch (schedule_type) { | |
5874 | case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC: | |
5875 | if (activate && session->active) { | |
5876 | /* | |
5877 | * Only start the timer if the session is active, | |
5878 | * otherwise it will be started when the session starts. | |
5879 | */ | |
92816cc3 JG |
5880 | ret = timer_session_rotation_schedule_timer_start( |
5881 | session, new_value); | |
259c2674 | 5882 | if (ret) { |
66ea93b1 | 5883 | ERR("Failed to enable session rotation timer in ROTATION_SET_SCHEDULE command"); |
259c2674 JD |
5884 | ret = LTTNG_ERR_UNK; |
5885 | goto end; | |
5886 | } | |
66ea93b1 | 5887 | } else { |
92816cc3 JG |
5888 | ret = timer_session_rotation_schedule_timer_stop( |
5889 | session); | |
66ea93b1 JG |
5890 | if (ret) { |
5891 | ERR("Failed to disable session rotation timer in ROTATION_SET_SCHEDULE command"); | |
5892 | ret = LTTNG_ERR_UNK; | |
f3ce6946 | 5893 | goto end; |
66ea93b1 | 5894 | } |
259c2674 | 5895 | } |
66ea93b1 JG |
5896 | break; |
5897 | case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD: | |
5898 | if (activate) { | |
5899 | ret = subscribe_session_consumed_size_rotation(session, | |
5900 | new_value, notification_thread_handle); | |
90936dcf | 5901 | if (ret) { |
66ea93b1 | 5902 | ERR("Failed to enable consumed-size notification in ROTATION_SET_SCHEDULE command"); |
90936dcf JD |
5903 | ret = LTTNG_ERR_UNK; |
5904 | goto end; | |
5905 | } | |
90936dcf | 5906 | } else { |
66ea93b1 JG |
5907 | ret = unsubscribe_session_consumed_size_rotation(session, |
5908 | notification_thread_handle); | |
90936dcf | 5909 | if (ret) { |
66ea93b1 | 5910 | ERR("Failed to disable consumed-size notification in ROTATION_SET_SCHEDULE command"); |
90936dcf JD |
5911 | ret = LTTNG_ERR_UNK; |
5912 | goto end; | |
5913 | } | |
66ea93b1 | 5914 | |
90936dcf | 5915 | } |
66ea93b1 JG |
5916 | break; |
5917 | default: | |
5918 | /* Would have been caught before. */ | |
5919 | abort(); | |
90936dcf JD |
5920 | } |
5921 | ||
259c2674 JD |
5922 | ret = LTTNG_OK; |
5923 | ||
5924 | goto end; | |
5925 | ||
5926 | end: | |
5927 | return ret; | |
5928 | } | |
5929 | ||
a503e1ef JG |
5930 | /* Wait for a given path to be removed before continuing. */ |
5931 | static enum lttng_error_code wait_on_path(void *path_data) | |
5932 | { | |
7966af57 | 5933 | const char *shm_path = (const char *) path_data; |
a503e1ef JG |
5934 | |
5935 | DBG("Waiting for the shm path at %s to be removed before completing session destruction", | |
5936 | shm_path); | |
5937 | while (true) { | |
5938 | int ret; | |
5939 | struct stat st; | |
5940 | ||
5941 | ret = stat(shm_path, &st); | |
5942 | if (ret) { | |
5943 | if (errno != ENOENT) { | |
5944 | PERROR("stat() returned an error while checking for the existence of the shm path"); | |
5945 | } else { | |
5946 | DBG("shm path no longer exists, completing the destruction of session"); | |
5947 | } | |
5948 | break; | |
5949 | } else { | |
5950 | if (!S_ISDIR(st.st_mode)) { | |
5951 | ERR("The type of shm path %s returned by stat() is not a directory; aborting the wait for shm path removal", | |
5952 | shm_path); | |
5953 | break; | |
5954 | } | |
5955 | } | |
5956 | usleep(SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US); | |
5957 | } | |
5958 | return LTTNG_OK; | |
5959 | } | |
5960 | ||
5961 | /* | |
5962 | * Returns a pointer to a handler to run on completion of a command. | |
5963 | * Returns NULL if no handler has to be run for the last command executed. | |
5964 | */ | |
5965 | const struct cmd_completion_handler *cmd_pop_completion_handler(void) | |
5966 | { | |
5967 | struct cmd_completion_handler *handler = current_completion_handler; | |
5968 | ||
5969 | current_completion_handler = NULL; | |
5970 | return handler; | |
5971 | } | |
5972 | ||
2f77fc4b DG |
5973 | /* |
5974 | * Init command subsystem. | |
5975 | */ | |
5976 | void cmd_init(void) | |
5977 | { | |
5978 | /* | |
d88aee68 DG |
5979 | * Set network sequence index to 1 for streams to match a relayd |
5980 | * socket on the consumer side. | |
2f77fc4b | 5981 | */ |
d88aee68 DG |
5982 | pthread_mutex_lock(&relayd_net_seq_idx_lock); |
5983 | relayd_net_seq_idx = 1; | |
5984 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
5985 | |
5986 | DBG("Command subsystem initialized"); | |
5987 | } |