Commit | Line | Data |
---|---|---|
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 | ||
f1494934 JG |
77 | static enum lttng_error_code wait_on_path(void *path); |
78 | ||
79 | namespace { | |
3e3665b8 JG |
80 | struct cmd_destroy_session_reply_context { |
81 | int reply_sock_fd; | |
82 | bool implicit_rotation_on_destroy; | |
3285a971 JG |
83 | /* |
84 | * Indicates whether or not an error occurred while launching the | |
85 | * destruction of a session. | |
86 | */ | |
87 | enum lttng_error_code destruction_status; | |
3e3665b8 JG |
88 | }; |
89 | ||
a503e1ef JG |
90 | /* |
91 | * Command completion handler that is used by the destroy command | |
92 | * when a session that has a non-default shm_path is being destroyed. | |
93 | * | |
94 | * See comment in cmd_destroy_session() for the rationale. | |
95 | */ | |
f1494934 | 96 | struct destroy_completion_handler { |
a503e1ef JG |
97 | struct cmd_completion_handler handler; |
98 | char shm_path[member_sizeof(struct ltt_session, shm_path)]; | |
99 | } destroy_completion_handler = { | |
100 | .handler = { | |
101 | .run = wait_on_path, | |
102 | .data = destroy_completion_handler.shm_path | |
103 | }, | |
104 | .shm_path = { 0 }, | |
105 | }; | |
106 | ||
2f77fc4b DG |
107 | /* |
108 | * Used to keep a unique index for each relayd socket created where this value | |
109 | * is associated with streams on the consumer so it can match the right relayd | |
d88aee68 DG |
110 | * to send to. It must be accessed with the relayd_net_seq_idx_lock |
111 | * held. | |
2f77fc4b | 112 | */ |
f1494934 JG |
113 | pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER; |
114 | uint64_t relayd_net_seq_idx; | |
115 | } /* namespace */ | |
2f77fc4b | 116 | |
f1494934 | 117 | static struct cmd_completion_handler *current_completion_handler; |
7076b56e JG |
118 | static int validate_ust_event_name(const char *); |
119 | static int cmd_enable_event_internal(struct ltt_session *session, | |
df4f5a87 | 120 | const struct lttng_domain *domain, |
7076b56e JG |
121 | char *channel_name, struct lttng_event *event, |
122 | char *filter_expression, | |
2b00d462 | 123 | struct lttng_bytecode *filter, |
7076b56e JG |
124 | struct lttng_event_exclusion *exclusion, |
125 | int wpipe); | |
4878de5c JG |
126 | static enum lttng_error_code cmd_enable_channel_internal( |
127 | struct ltt_session *session, | |
999af9c1 JR |
128 | const struct lttng_domain *domain, |
129 | const struct lttng_channel *_attr, | |
130 | int wpipe); | |
7076b56e | 131 | |
2f77fc4b DG |
132 | /* |
133 | * Create a session path used by list_lttng_sessions for the case that the | |
134 | * session consumer is on the network. | |
135 | */ | |
136 | static int build_network_session_path(char *dst, size_t size, | |
137 | struct ltt_session *session) | |
138 | { | |
139 | int ret, kdata_port, udata_port; | |
140 | struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL; | |
141 | char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX]; | |
142 | ||
a0377dfe FD |
143 | LTTNG_ASSERT(session); |
144 | LTTNG_ASSERT(dst); | |
2f77fc4b DG |
145 | |
146 | memset(tmp_urls, 0, sizeof(tmp_urls)); | |
147 | memset(tmp_uurl, 0, sizeof(tmp_uurl)); | |
148 | ||
149 | kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT; | |
150 | ||
151 | if (session->kernel_session && session->kernel_session->consumer) { | |
152 | kuri = &session->kernel_session->consumer->dst.net.control; | |
153 | kdata_port = session->kernel_session->consumer->dst.net.data.port; | |
154 | } | |
155 | ||
156 | if (session->ust_session && session->ust_session->consumer) { | |
157 | uuri = &session->ust_session->consumer->dst.net.control; | |
158 | udata_port = session->ust_session->consumer->dst.net.data.port; | |
159 | } | |
160 | ||
161 | if (uuri == NULL && kuri == NULL) { | |
162 | uri = &session->consumer->dst.net.control; | |
163 | kdata_port = session->consumer->dst.net.data.port; | |
164 | } else if (kuri && uuri) { | |
165 | ret = uri_compare(kuri, uuri); | |
166 | if (ret) { | |
167 | /* Not Equal */ | |
168 | uri = kuri; | |
169 | /* Build uuri URL string */ | |
170 | ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl)); | |
171 | if (ret < 0) { | |
172 | goto error; | |
173 | } | |
174 | } else { | |
175 | uri = kuri; | |
176 | } | |
177 | } else if (kuri && uuri == NULL) { | |
178 | uri = kuri; | |
179 | } else if (uuri && kuri == NULL) { | |
180 | uri = uuri; | |
181 | } | |
182 | ||
183 | ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls)); | |
184 | if (ret < 0) { | |
185 | goto error; | |
186 | } | |
187 | ||
9aa9f900 DG |
188 | /* |
189 | * Do we have a UST url set. If yes, this means we have both kernel and UST | |
190 | * to print. | |
191 | */ | |
9d035200 | 192 | if (*tmp_uurl != '\0') { |
2f77fc4b DG |
193 | ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]", |
194 | tmp_urls, kdata_port, tmp_uurl, udata_port); | |
195 | } else { | |
9aa9f900 | 196 | int dport; |
bef08707 | 197 | if (kuri || (!kuri && !uuri)) { |
9aa9f900 DG |
198 | dport = kdata_port; |
199 | } else { | |
200 | /* No kernel URI, use the UST port. */ | |
201 | dport = udata_port; | |
202 | } | |
203 | ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport); | |
2f77fc4b DG |
204 | } |
205 | ||
206 | error: | |
207 | return ret; | |
208 | } | |
209 | ||
fb83fe64 JD |
210 | /* |
211 | * Get run-time attributes if the session has been started (discarded events, | |
212 | * lost packets). | |
213 | */ | |
214 | static int get_kernel_runtime_stats(struct ltt_session *session, | |
215 | struct ltt_kernel_channel *kchan, uint64_t *discarded_events, | |
216 | uint64_t *lost_packets) | |
217 | { | |
218 | int ret; | |
219 | ||
220 | if (!session->has_been_started) { | |
221 | ret = 0; | |
222 | *discarded_events = 0; | |
223 | *lost_packets = 0; | |
224 | goto end; | |
225 | } | |
226 | ||
e1f3997a | 227 | ret = consumer_get_discarded_events(session->id, kchan->key, |
fb83fe64 JD |
228 | session->kernel_session->consumer, |
229 | discarded_events); | |
230 | if (ret < 0) { | |
231 | goto end; | |
232 | } | |
233 | ||
e1f3997a | 234 | ret = consumer_get_lost_packets(session->id, kchan->key, |
fb83fe64 JD |
235 | session->kernel_session->consumer, |
236 | lost_packets); | |
237 | if (ret < 0) { | |
238 | goto end; | |
239 | } | |
240 | ||
241 | end: | |
242 | return ret; | |
243 | } | |
244 | ||
245 | /* | |
246 | * Get run-time attributes if the session has been started (discarded events, | |
247 | * lost packets). | |
248 | */ | |
249 | static int get_ust_runtime_stats(struct ltt_session *session, | |
250 | struct ltt_ust_channel *uchan, uint64_t *discarded_events, | |
251 | uint64_t *lost_packets) | |
252 | { | |
253 | int ret; | |
254 | struct ltt_ust_session *usess; | |
255 | ||
a91c5803 JG |
256 | if (!discarded_events || !lost_packets) { |
257 | ret = -1; | |
258 | goto end; | |
259 | } | |
260 | ||
fb83fe64 | 261 | usess = session->ust_session; |
a0377dfe FD |
262 | LTTNG_ASSERT(discarded_events); |
263 | LTTNG_ASSERT(lost_packets); | |
fb83fe64 JD |
264 | |
265 | if (!usess || !session->has_been_started) { | |
266 | *discarded_events = 0; | |
267 | *lost_packets = 0; | |
268 | ret = 0; | |
269 | goto end; | |
270 | } | |
271 | ||
272 | if (usess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
273 | ret = ust_app_uid_get_channel_runtime_stats(usess->id, | |
274 | &usess->buffer_reg_uid_list, | |
275 | usess->consumer, uchan->id, | |
276 | uchan->attr.overwrite, | |
277 | discarded_events, | |
278 | lost_packets); | |
279 | } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
280 | ret = ust_app_pid_get_channel_runtime_stats(usess, | |
281 | uchan, usess->consumer, | |
282 | uchan->attr.overwrite, | |
283 | discarded_events, | |
284 | lost_packets); | |
285 | if (ret < 0) { | |
286 | goto end; | |
287 | } | |
288 | *discarded_events += uchan->per_pid_closed_app_discarded; | |
289 | *lost_packets += uchan->per_pid_closed_app_lost; | |
290 | } else { | |
291 | ERR("Unsupported buffer type"); | |
a0377dfe | 292 | abort(); |
fb83fe64 JD |
293 | ret = -1; |
294 | goto end; | |
295 | } | |
296 | ||
297 | end: | |
298 | return ret; | |
299 | } | |
300 | ||
3c6a091f | 301 | /* |
022d91ba | 302 | * Create a list of agent domain events. |
3c6a091f DG |
303 | * |
304 | * Return number of events in list on success or else a negative value. | |
305 | */ | |
8ddd72ef JR |
306 | static enum lttng_error_code list_lttng_agent_events( |
307 | struct agent *agt, struct lttng_payload *reply_payload, | |
308 | unsigned int *nb_events) | |
3c6a091f | 309 | { |
8ddd72ef JR |
310 | enum lttng_error_code ret_code; |
311 | int ret = 0; | |
312 | unsigned int local_nb_events = 0; | |
313 | struct agent_event *event; | |
3c6a091f | 314 | struct lttng_ht_iter iter; |
8ddd72ef | 315 | unsigned long agent_event_count; |
3c6a091f | 316 | |
8ddd72ef JR |
317 | assert(agt); |
318 | assert(reply_payload); | |
3c6a091f | 319 | |
022d91ba | 320 | DBG3("Listing agent events"); |
3c6a091f | 321 | |
e5bbf678 | 322 | rcu_read_lock(); |
8ddd72ef JR |
323 | agent_event_count = lttng_ht_get_count(agt->events); |
324 | if (agent_event_count == 0) { | |
325 | /* Early exit. */ | |
326 | goto end; | |
327 | } | |
7966af57 | 328 | |
8ddd72ef JR |
329 | if (agent_event_count > UINT_MAX) { |
330 | ret_code = LTTNG_ERR_OVERFLOW; | |
331 | goto error; | |
332 | } | |
e368fb43 | 333 | |
8ddd72ef | 334 | local_nb_events = (unsigned int) agent_event_count; |
e368fb43 | 335 | |
8ddd72ef JR |
336 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
337 | struct lttng_event *tmp_event = lttng_event_create(); | |
338 | ||
339 | if (!tmp_event) { | |
340 | ret_code = LTTNG_ERR_NOMEM; | |
341 | goto error; | |
3c02e545 | 342 | } |
b4e3ceb9 | 343 | |
8ddd72ef JR |
344 | if (lttng_strncpy(tmp_event->name, event->name, sizeof(tmp_event->name))) { |
345 | lttng_event_destroy(tmp_event); | |
346 | ret_code = LTTNG_ERR_FATAL; | |
347 | goto error; | |
348 | } | |
349 | ||
350 | tmp_event->name[sizeof(tmp_event->name) - 1] = '\0'; | |
351 | tmp_event->enabled = !!event->enabled_count; | |
352 | tmp_event->loglevel = event->loglevel_value; | |
353 | tmp_event->loglevel_type = event->loglevel_type; | |
3c6a091f | 354 | |
8ddd72ef JR |
355 | ret = lttng_event_serialize(tmp_event, 0, NULL, |
356 | event->filter_expression, 0, NULL, reply_payload); | |
357 | lttng_event_destroy(tmp_event); | |
3c02e545 | 358 | if (ret) { |
8ddd72ef JR |
359 | ret_code = LTTNG_ERR_FATAL; |
360 | goto error; | |
3c02e545 | 361 | } |
3c6a091f | 362 | } |
3c6a091f | 363 | |
47e52862 | 364 | end: |
8ddd72ef JR |
365 | ret_code = LTTNG_OK; |
366 | *nb_events = local_nb_events; | |
367 | error: | |
3c02e545 | 368 | rcu_read_unlock(); |
8ddd72ef | 369 | return ret_code; |
3c6a091f DG |
370 | } |
371 | ||
2f77fc4b DG |
372 | /* |
373 | * Create a list of ust global domain events. | |
374 | */ | |
8ddd72ef | 375 | static enum lttng_error_code list_lttng_ust_global_events(char *channel_name, |
b4e3ceb9 | 376 | struct ltt_ust_domain_global *ust_global, |
8ddd72ef JR |
377 | struct lttng_payload *reply_payload, |
378 | unsigned int *nb_events) | |
2f77fc4b | 379 | { |
8ddd72ef JR |
380 | enum lttng_error_code ret_code; |
381 | int ret; | |
2f77fc4b | 382 | struct lttng_ht_iter iter; |
8ddd72ef JR |
383 | struct lttng_ht_node_str *node; |
384 | struct ltt_ust_channel *uchan; | |
385 | struct ltt_ust_event *uevent; | |
386 | unsigned long channel_event_count; | |
387 | unsigned int local_nb_events = 0; | |
388 | ||
389 | assert(reply_payload); | |
390 | assert(nb_events); | |
2f77fc4b DG |
391 | |
392 | DBG("Listing UST global events for channel %s", channel_name); | |
393 | ||
394 | rcu_read_lock(); | |
395 | ||
e368fb43 | 396 | lttng_ht_lookup(ust_global->channels, (void *) channel_name, &iter); |
2f77fc4b DG |
397 | node = lttng_ht_iter_get_node_str(&iter); |
398 | if (node == NULL) { | |
8ddd72ef | 399 | ret_code = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
e68d8bdb | 400 | goto error; |
2f77fc4b DG |
401 | } |
402 | ||
403 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); | |
404 | ||
8ddd72ef JR |
405 | channel_event_count = lttng_ht_get_count(uchan->events); |
406 | if (channel_event_count == 0) { | |
407 | /* Early exit. */ | |
408 | ret_code = LTTNG_OK; | |
409 | goto end; | |
410 | } | |
411 | ||
412 | if (channel_event_count > UINT_MAX) { | |
413 | ret_code = LTTNG_ERR_OVERFLOW; | |
414 | goto error; | |
415 | } | |
416 | ||
417 | local_nb_events = (unsigned int) channel_event_count; | |
418 | ||
419 | DBG3("Listing UST global %d events", *nb_events); | |
2f77fc4b | 420 | |
b4e3ceb9 | 421 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
8ddd72ef | 422 | struct lttng_event *tmp_event = NULL; |
e368fb43 | 423 | |
b4e3ceb9 | 424 | if (uevent->internal) { |
8ddd72ef JR |
425 | /* This event should remain hidden from clients */ |
426 | local_nb_events--; | |
b4e3ceb9 PP |
427 | continue; |
428 | } | |
429 | ||
8ddd72ef JR |
430 | tmp_event = lttng_event_create(); |
431 | if (!tmp_event) { | |
432 | ret_code = LTTNG_ERR_NOMEM; | |
e68d8bdb | 433 | goto error; |
43ed1485 | 434 | } |
2f77fc4b | 435 | |
8ddd72ef JR |
436 | if (lttng_strncpy(tmp_event->name, uevent->attr.name, |
437 | LTTNG_SYMBOL_NAME_LEN)) { | |
438 | ret_code = LTTNG_ERR_FATAL; | |
439 | lttng_event_destroy(tmp_event); | |
e68d8bdb | 440 | goto error; |
8ddd72ef JR |
441 | } |
442 | ||
443 | tmp_event->name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
444 | tmp_event->enabled = uevent->enabled; | |
2f77fc4b DG |
445 | |
446 | switch (uevent->attr.instrumentation) { | |
fc4b93fa | 447 | case LTTNG_UST_ABI_TRACEPOINT: |
8ddd72ef | 448 | tmp_event->type = LTTNG_EVENT_TRACEPOINT; |
2f77fc4b | 449 | break; |
fc4b93fa | 450 | case LTTNG_UST_ABI_PROBE: |
8ddd72ef | 451 | tmp_event->type = LTTNG_EVENT_PROBE; |
2f77fc4b | 452 | break; |
fc4b93fa | 453 | case LTTNG_UST_ABI_FUNCTION: |
8ddd72ef | 454 | tmp_event->type = LTTNG_EVENT_FUNCTION; |
2f77fc4b DG |
455 | break; |
456 | } | |
457 | ||
8ddd72ef | 458 | tmp_event->loglevel = uevent->attr.loglevel; |
2f77fc4b | 459 | switch (uevent->attr.loglevel_type) { |
fc4b93fa | 460 | case LTTNG_UST_ABI_LOGLEVEL_ALL: |
8ddd72ef | 461 | tmp_event->loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; |
2f77fc4b | 462 | break; |
fc4b93fa | 463 | case LTTNG_UST_ABI_LOGLEVEL_RANGE: |
8ddd72ef | 464 | tmp_event->loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; |
2f77fc4b | 465 | break; |
fc4b93fa | 466 | case LTTNG_UST_ABI_LOGLEVEL_SINGLE: |
8ddd72ef | 467 | tmp_event->loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; |
2f77fc4b DG |
468 | break; |
469 | } | |
470 | if (uevent->filter) { | |
8ddd72ef | 471 | tmp_event->filter = 1; |
2f77fc4b | 472 | } |
4634f12e | 473 | if (uevent->exclusion) { |
8ddd72ef | 474 | tmp_event->exclusion = 1; |
4634f12e | 475 | } |
b4e3ceb9 | 476 | |
8ddd72ef JR |
477 | /* |
478 | * We do not care about the filter bytecode and the fd from the | |
479 | * userspace_probe_location. | |
480 | */ | |
481 | ret = lttng_event_serialize(tmp_event, uevent->exclusion ? uevent->exclusion->count : 0, | |
482 | uevent->exclusion ? (char **) uevent->exclusion ->names : NULL, | |
483 | uevent->filter_expression, 0, NULL, reply_payload); | |
484 | lttng_event_destroy(tmp_event); | |
3c02e545 | 485 | if (ret) { |
8ddd72ef JR |
486 | ret_code = LTTNG_ERR_FATAL; |
487 | goto error; | |
3c02e545 | 488 | } |
2f77fc4b DG |
489 | } |
490 | ||
d31d3e8c | 491 | end: |
8ddd72ef JR |
492 | /* nb_events is already set at this point. */ |
493 | ret_code = LTTNG_OK; | |
494 | *nb_events = local_nb_events; | |
495 | error: | |
2f77fc4b | 496 | rcu_read_unlock(); |
8ddd72ef | 497 | return ret_code; |
2f77fc4b DG |
498 | } |
499 | ||
500 | /* | |
501 | * Fill lttng_event array of all kernel events in the channel. | |
502 | */ | |
8ddd72ef | 503 | static enum lttng_error_code list_lttng_kernel_events(char *channel_name, |
b4e3ceb9 | 504 | struct ltt_kernel_session *kernel_session, |
8ddd72ef JR |
505 | struct lttng_payload *reply_payload, |
506 | unsigned int *nb_events) | |
2f77fc4b | 507 | { |
8ddd72ef | 508 | enum lttng_error_code ret_code; |
e368fb43 | 509 | int ret; |
8ddd72ef JR |
510 | struct ltt_kernel_event *event; |
511 | struct ltt_kernel_channel *kchan; | |
512 | ||
513 | assert(reply_payload); | |
2f77fc4b DG |
514 | |
515 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
516 | if (kchan == NULL) { | |
8ddd72ef JR |
517 | ret_code = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
518 | goto end; | |
2f77fc4b DG |
519 | } |
520 | ||
8ddd72ef | 521 | *nb_events = kchan->event_count; |
2f77fc4b DG |
522 | |
523 | DBG("Listing events for channel %s", kchan->channel->name); | |
524 | ||
8ddd72ef JR |
525 | if (*nb_events == 0) { |
526 | ret_code = LTTNG_OK; | |
527 | goto end; | |
528 | } | |
529 | ||
e368fb43 | 530 | /* Kernel channels */ |
8ddd72ef JR |
531 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { |
532 | struct lttng_event *tmp_event = lttng_event_create(); | |
2f77fc4b | 533 | |
8ddd72ef JR |
534 | if (!tmp_event) { |
535 | ret_code = LTTNG_ERR_NOMEM; | |
536 | goto end; | |
537 | } | |
538 | ||
539 | if (lttng_strncpy(tmp_event->name, event->event->name, LTTNG_SYMBOL_NAME_LEN)) { | |
540 | lttng_event_destroy(tmp_event); | |
541 | ret_code = LTTNG_ERR_FATAL; | |
43ed1485 | 542 | goto end; |
8ddd72ef | 543 | |
43ed1485 JG |
544 | } |
545 | ||
8ddd72ef JR |
546 | tmp_event->name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
547 | tmp_event->enabled = event->enabled; | |
548 | tmp_event->filter = (unsigned char) !!event->filter_expression; | |
b4e3ceb9 | 549 | |
8ddd72ef | 550 | switch (event->event->instrumentation) { |
b8e2fb80 | 551 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
8ddd72ef | 552 | tmp_event->type = LTTNG_EVENT_TRACEPOINT; |
2f77fc4b | 553 | break; |
b8e2fb80 | 554 | case LTTNG_KERNEL_ABI_KRETPROBE: |
8ddd72ef JR |
555 | tmp_event->type = LTTNG_EVENT_FUNCTION; |
556 | memcpy(&tmp_event->attr.probe, &event->event->u.kprobe, | |
b8e2fb80 | 557 | sizeof(struct lttng_kernel_abi_kprobe)); |
1896972b | 558 | break; |
b8e2fb80 | 559 | case LTTNG_KERNEL_ABI_KPROBE: |
8ddd72ef JR |
560 | tmp_event->type = LTTNG_EVENT_PROBE; |
561 | memcpy(&tmp_event->attr.probe, &event->event->u.kprobe, | |
b8e2fb80 | 562 | sizeof(struct lttng_kernel_abi_kprobe)); |
2f77fc4b | 563 | break; |
b8e2fb80 | 564 | case LTTNG_KERNEL_ABI_UPROBE: |
8ddd72ef | 565 | tmp_event->type = LTTNG_EVENT_USERSPACE_PROBE; |
b955b4d4 | 566 | break; |
b8e2fb80 | 567 | case LTTNG_KERNEL_ABI_FUNCTION: |
8ddd72ef JR |
568 | tmp_event->type = LTTNG_EVENT_FUNCTION; |
569 | memcpy(&(tmp_event->attr.ftrace), &event->event->u.ftrace, | |
b8e2fb80 | 570 | sizeof(struct lttng_kernel_abi_function)); |
2f77fc4b | 571 | break; |
b8e2fb80 | 572 | case LTTNG_KERNEL_ABI_NOOP: |
8ddd72ef | 573 | tmp_event->type = LTTNG_EVENT_NOOP; |
2f77fc4b | 574 | break; |
b8e2fb80 | 575 | case LTTNG_KERNEL_ABI_SYSCALL: |
8ddd72ef | 576 | tmp_event->type = LTTNG_EVENT_SYSCALL; |
2f77fc4b | 577 | break; |
b8e2fb80 | 578 | case LTTNG_KERNEL_ABI_ALL: |
1ab8c2ad FD |
579 | /* fall-through. */ |
580 | default: | |
a0377dfe | 581 | abort(); |
2f77fc4b DG |
582 | break; |
583 | } | |
b4e3ceb9 | 584 | |
8ddd72ef JR |
585 | if (event->userspace_probe_location) { |
586 | struct lttng_userspace_probe_location *location_copy = | |
587 | lttng_userspace_probe_location_copy( | |
588 | event->userspace_probe_location); | |
589 | ||
590 | if (!location_copy) { | |
591 | lttng_event_destroy(tmp_event); | |
592 | ret_code = LTTNG_ERR_NOMEM; | |
593 | goto end; | |
594 | } | |
595 | ||
596 | ret = lttng_event_set_userspace_probe_location( | |
597 | tmp_event, location_copy); | |
598 | if (ret) { | |
599 | lttng_event_destroy(tmp_event); | |
600 | lttng_userspace_probe_location_destroy( | |
601 | location_copy); | |
602 | ret_code = LTTNG_ERR_INVALID; | |
603 | goto end; | |
604 | } | |
e368fb43 | 605 | } |
e368fb43 | 606 | |
8ddd72ef JR |
607 | ret = lttng_event_serialize(tmp_event, 0, NULL, |
608 | event->filter_expression, 0, NULL, reply_payload); | |
609 | lttng_event_destroy(tmp_event); | |
3c02e545 | 610 | if (ret) { |
8ddd72ef JR |
611 | ret_code = LTTNG_ERR_FATAL; |
612 | goto end; | |
3c02e545 | 613 | } |
2f77fc4b DG |
614 | } |
615 | ||
8ddd72ef | 616 | ret_code = LTTNG_OK; |
db906c12 | 617 | end: |
8ddd72ef | 618 | return ret_code; |
2f77fc4b DG |
619 | } |
620 | ||
621 | /* | |
622 | * Add URI so the consumer output object. Set the correct path depending on the | |
623 | * domain adding the default trace directory. | |
624 | */ | |
b178f53e JG |
625 | static enum lttng_error_code add_uri_to_consumer( |
626 | const struct ltt_session *session, | |
627 | struct consumer_output *consumer, | |
628 | struct lttng_uri *uri, enum lttng_domain_type domain) | |
2f77fc4b | 629 | { |
b178f53e JG |
630 | int ret; |
631 | enum lttng_error_code ret_code = LTTNG_OK; | |
2f77fc4b | 632 | |
a0377dfe | 633 | LTTNG_ASSERT(uri); |
2f77fc4b DG |
634 | |
635 | if (consumer == NULL) { | |
636 | DBG("No consumer detected. Don't add URI. Stopping."); | |
b178f53e | 637 | ret_code = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
638 | goto error; |
639 | } | |
640 | ||
641 | switch (domain) { | |
642 | case LTTNG_DOMAIN_KERNEL: | |
b178f53e JG |
643 | ret = lttng_strncpy(consumer->domain_subdir, |
644 | DEFAULT_KERNEL_TRACE_DIR, | |
645 | sizeof(consumer->domain_subdir)); | |
2f77fc4b DG |
646 | break; |
647 | case LTTNG_DOMAIN_UST: | |
b178f53e JG |
648 | ret = lttng_strncpy(consumer->domain_subdir, |
649 | DEFAULT_UST_TRACE_DIR, | |
650 | sizeof(consumer->domain_subdir)); | |
2f77fc4b DG |
651 | break; |
652 | default: | |
653 | /* | |
b178f53e JG |
654 | * This case is possible is we try to add the URI to the global |
655 | * tracing session consumer object which in this case there is | |
656 | * no subdir. | |
2f77fc4b | 657 | */ |
b178f53e JG |
658 | memset(consumer->domain_subdir, 0, |
659 | sizeof(consumer->domain_subdir)); | |
660 | ret = 0; | |
661 | } | |
662 | if (ret) { | |
663 | ERR("Failed to initialize consumer output domain subdirectory"); | |
664 | ret_code = LTTNG_ERR_FATAL; | |
665 | goto error; | |
2f77fc4b DG |
666 | } |
667 | ||
668 | switch (uri->dtype) { | |
669 | case LTTNG_DST_IPV4: | |
670 | case LTTNG_DST_IPV6: | |
671 | DBG2("Setting network URI to consumer"); | |
672 | ||
df75acac DG |
673 | if (consumer->type == CONSUMER_DST_NET) { |
674 | if ((uri->stype == LTTNG_STREAM_CONTROL && | |
785d2d0d DG |
675 | consumer->dst.net.control_isset) || |
676 | (uri->stype == LTTNG_STREAM_DATA && | |
677 | consumer->dst.net.data_isset)) { | |
b178f53e | 678 | ret_code = LTTNG_ERR_URL_EXIST; |
df75acac DG |
679 | goto error; |
680 | } | |
681 | } else { | |
b178f53e | 682 | memset(&consumer->dst, 0, sizeof(consumer->dst)); |
785d2d0d DG |
683 | } |
684 | ||
2f77fc4b | 685 | /* Set URI into consumer output object */ |
b178f53e | 686 | ret = consumer_set_network_uri(session, consumer, uri); |
2f77fc4b | 687 | if (ret < 0) { |
7966af57 | 688 | ret_code = (lttng_error_code) -ret; |
2f77fc4b DG |
689 | goto error; |
690 | } else if (ret == 1) { | |
691 | /* | |
692 | * URI was the same in the consumer so we do not append the subdir | |
693 | * again so to not duplicate output dir. | |
694 | */ | |
b178f53e | 695 | ret_code = LTTNG_OK; |
2f77fc4b DG |
696 | goto error; |
697 | } | |
2f77fc4b DG |
698 | break; |
699 | case LTTNG_DST_PATH: | |
b178f53e JG |
700 | if (*uri->dst.path != '/' || strstr(uri->dst.path, "../")) { |
701 | ret_code = LTTNG_ERR_INVALID; | |
9ac05d92 MD |
702 | goto error; |
703 | } | |
b178f53e JG |
704 | DBG2("Setting trace directory path from URI to %s", |
705 | uri->dst.path); | |
706 | memset(&consumer->dst, 0, sizeof(consumer->dst)); | |
707 | ||
708 | ret = lttng_strncpy(consumer->dst.session_root_path, | |
709 | uri->dst.path, | |
710 | sizeof(consumer->dst.session_root_path)); | |
4df41cad JG |
711 | if (ret) { |
712 | ret_code = LTTNG_ERR_FATAL; | |
713 | goto error; | |
714 | } | |
2f77fc4b DG |
715 | consumer->type = CONSUMER_DST_LOCAL; |
716 | break; | |
717 | } | |
718 | ||
b178f53e | 719 | ret_code = LTTNG_OK; |
2f77fc4b | 720 | error: |
b178f53e | 721 | return ret_code; |
2f77fc4b DG |
722 | } |
723 | ||
724 | /* | |
725 | * Init tracing by creating trace directory and sending fds kernel consumer. | |
726 | */ | |
727 | static int init_kernel_tracing(struct ltt_kernel_session *session) | |
728 | { | |
729 | int ret = 0; | |
730 | struct lttng_ht_iter iter; | |
731 | struct consumer_socket *socket; | |
732 | ||
a0377dfe | 733 | LTTNG_ASSERT(session); |
2f77fc4b | 734 | |
e7fe706f DG |
735 | rcu_read_lock(); |
736 | ||
2f77fc4b DG |
737 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { |
738 | cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter, | |
739 | socket, node.node) { | |
2f77fc4b | 740 | pthread_mutex_lock(socket->lock); |
f50f23d9 | 741 | ret = kernel_consumer_send_session(socket, session); |
2f77fc4b DG |
742 | pthread_mutex_unlock(socket->lock); |
743 | if (ret < 0) { | |
f73fabfd | 744 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
745 | goto error; |
746 | } | |
747 | } | |
748 | } | |
749 | ||
750 | error: | |
e7fe706f | 751 | rcu_read_unlock(); |
2f77fc4b DG |
752 | return ret; |
753 | } | |
754 | ||
755 | /* | |
756 | * Create a socket to the relayd using the URI. | |
757 | * | |
758 | * On success, the relayd_sock pointer is set to the created socket. | |
9a654598 | 759 | * Else, it remains untouched and an LTTng error code is returned. |
2f77fc4b | 760 | */ |
9a654598 | 761 | static enum lttng_error_code create_connect_relayd(struct lttng_uri *uri, |
b31610f2 JD |
762 | struct lttcomm_relayd_sock **relayd_sock, |
763 | struct consumer_output *consumer) | |
2f77fc4b DG |
764 | { |
765 | int ret; | |
9a654598 | 766 | enum lttng_error_code status = LTTNG_OK; |
6151a90f | 767 | struct lttcomm_relayd_sock *rsock; |
2f77fc4b | 768 | |
6151a90f JD |
769 | rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR, |
770 | RELAYD_VERSION_COMM_MINOR); | |
771 | if (!rsock) { | |
9a654598 | 772 | status = LTTNG_ERR_FATAL; |
2f77fc4b DG |
773 | goto error; |
774 | } | |
775 | ||
ffe60014 DG |
776 | /* |
777 | * Connect to relayd so we can proceed with a session creation. This call | |
778 | * can possibly block for an arbitrary amount of time to set the health | |
779 | * state to be in poll execution. | |
780 | */ | |
781 | health_poll_entry(); | |
6151a90f | 782 | ret = relayd_connect(rsock); |
ffe60014 | 783 | health_poll_exit(); |
2f77fc4b DG |
784 | if (ret < 0) { |
785 | ERR("Unable to reach lttng-relayd"); | |
9a654598 | 786 | status = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
787 | goto free_sock; |
788 | } | |
789 | ||
790 | /* Create socket for control stream. */ | |
791 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
eacb7b6f MD |
792 | uint64_t result_flags; |
793 | ||
2f77fc4b DG |
794 | DBG3("Creating relayd stream socket from URI"); |
795 | ||
796 | /* Check relayd version */ | |
6151a90f | 797 | ret = relayd_version_check(rsock); |
67d5aa28 | 798 | if (ret == LTTNG_ERR_RELAYD_VERSION_FAIL) { |
9a654598 | 799 | status = LTTNG_ERR_RELAYD_VERSION_FAIL; |
67d5aa28 JD |
800 | goto close_sock; |
801 | } else if (ret < 0) { | |
802 | ERR("Unable to reach lttng-relayd"); | |
9a654598 | 803 | status = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
804 | goto close_sock; |
805 | } | |
b31610f2 JD |
806 | consumer->relay_major_version = rsock->major; |
807 | consumer->relay_minor_version = rsock->minor; | |
eacb7b6f MD |
808 | ret = relayd_get_configuration(rsock, 0, |
809 | &result_flags); | |
810 | if (ret < 0) { | |
811 | ERR("Unable to get relayd configuration"); | |
812 | status = LTTNG_ERR_RELAYD_CONNECT_FAIL; | |
813 | goto close_sock; | |
814 | } | |
815 | if (result_flags & LTTCOMM_RELAYD_CONFIGURATION_FLAG_CLEAR_ALLOWED) { | |
816 | consumer->relay_allows_clear = true; | |
817 | } | |
2f77fc4b DG |
818 | } else if (uri->stype == LTTNG_STREAM_DATA) { |
819 | DBG3("Creating relayd data socket from URI"); | |
820 | } else { | |
821 | /* Command is not valid */ | |
822 | ERR("Relayd invalid stream type: %d", uri->stype); | |
9a654598 | 823 | status = LTTNG_ERR_INVALID; |
2f77fc4b DG |
824 | goto close_sock; |
825 | } | |
826 | ||
6151a90f | 827 | *relayd_sock = rsock; |
2f77fc4b | 828 | |
9a654598 | 829 | return status; |
2f77fc4b DG |
830 | |
831 | close_sock: | |
6151a90f JD |
832 | /* The returned value is not useful since we are on an error path. */ |
833 | (void) relayd_close(rsock); | |
2f77fc4b | 834 | free_sock: |
6151a90f | 835 | free(rsock); |
2f77fc4b | 836 | error: |
9a654598 | 837 | return status; |
2f77fc4b DG |
838 | } |
839 | ||
840 | /* | |
841 | * Connect to the relayd using URI and send the socket to the right consumer. | |
43fade62 JG |
842 | * |
843 | * The consumer socket lock must be held by the caller. | |
9a654598 JG |
844 | * |
845 | * Returns LTTNG_OK on success or an LTTng error code on failure. | |
2f77fc4b | 846 | */ |
9a654598 JG |
847 | static enum lttng_error_code send_consumer_relayd_socket( |
848 | unsigned int session_id, | |
3044f922 | 849 | struct lttng_uri *relayd_uri, |
56a37563 | 850 | struct consumer_output *consumer, |
d3e2ba59 | 851 | struct consumer_socket *consumer_sock, |
fb9a95c4 | 852 | const char *session_name, const char *hostname, |
6fa5fe7c | 853 | const char *base_path, int session_live_timer, |
0e270a1e | 854 | const uint64_t *current_chunk_id, |
46ef2188 MD |
855 | time_t session_creation_time, |
856 | bool session_name_contains_creation_time) | |
2f77fc4b DG |
857 | { |
858 | int ret; | |
6151a90f | 859 | struct lttcomm_relayd_sock *rsock = NULL; |
9a654598 | 860 | enum lttng_error_code status; |
2f77fc4b | 861 | |
ffe60014 | 862 | /* Connect to relayd and make version check if uri is the control. */ |
9a654598 JG |
863 | status = create_connect_relayd(relayd_uri, &rsock, consumer); |
864 | if (status != LTTNG_OK) { | |
9e218353 | 865 | goto relayd_comm_error; |
ffe60014 | 866 | } |
a0377dfe | 867 | LTTNG_ASSERT(rsock); |
ffe60014 | 868 | |
2f77fc4b | 869 | /* Set the network sequence index if not set. */ |
d88aee68 DG |
870 | if (consumer->net_seq_index == (uint64_t) -1ULL) { |
871 | pthread_mutex_lock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
872 | /* |
873 | * Increment net_seq_idx because we are about to transfer the | |
874 | * new relayd socket to the consumer. | |
d88aee68 | 875 | * Assign unique key so the consumer can match streams. |
2f77fc4b | 876 | */ |
d88aee68 DG |
877 | consumer->net_seq_index = ++relayd_net_seq_idx; |
878 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
879 | } |
880 | ||
2f77fc4b | 881 | /* Send relayd socket to consumer. */ |
6151a90f | 882 | ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer, |
d3e2ba59 | 883 | relayd_uri->stype, session_id, |
6fa5fe7c MD |
884 | session_name, hostname, base_path, |
885 | session_live_timer, current_chunk_id, | |
46ef2188 | 886 | session_creation_time, session_name_contains_creation_time); |
2f77fc4b | 887 | if (ret < 0) { |
9a654598 | 888 | status = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
889 | goto close_sock; |
890 | } | |
891 | ||
c890b720 DG |
892 | /* Flag that the corresponding socket was sent. */ |
893 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
ffe60014 | 894 | consumer_sock->control_sock_sent = 1; |
c890b720 | 895 | } else if (relayd_uri->stype == LTTNG_STREAM_DATA) { |
ffe60014 | 896 | consumer_sock->data_sock_sent = 1; |
c890b720 DG |
897 | } |
898 | ||
2f77fc4b DG |
899 | /* |
900 | * Close socket which was dup on the consumer side. The session daemon does | |
901 | * NOT keep track of the relayd socket(s) once transfer to the consumer. | |
902 | */ | |
903 | ||
904 | close_sock: | |
9a654598 | 905 | if (status != LTTNG_OK) { |
ffe60014 | 906 | /* |
d9078d0c DG |
907 | * The consumer output for this session should not be used anymore |
908 | * since the relayd connection failed thus making any tracing or/and | |
909 | * streaming not usable. | |
ffe60014 | 910 | */ |
d9078d0c | 911 | consumer->enabled = 0; |
ffe60014 | 912 | } |
9e218353 JR |
913 | (void) relayd_close(rsock); |
914 | free(rsock); | |
915 | ||
916 | relayd_comm_error: | |
9a654598 | 917 | return status; |
2f77fc4b DG |
918 | } |
919 | ||
920 | /* | |
921 | * Send both relayd sockets to a specific consumer and domain. This is a | |
922 | * helper function to facilitate sending the information to the consumer for a | |
923 | * session. | |
43fade62 JG |
924 | * |
925 | * The consumer socket lock must be held by the caller. | |
9a654598 JG |
926 | * |
927 | * Returns LTTNG_OK, or an LTTng error code on failure. | |
2f77fc4b | 928 | */ |
9a654598 | 929 | static enum lttng_error_code send_consumer_relayd_sockets( |
56a37563 | 930 | unsigned int session_id, struct consumer_output *consumer, |
fb9a95c4 | 931 | struct consumer_socket *sock, const char *session_name, |
6fa5fe7c | 932 | const char *hostname, const char *base_path, int session_live_timer, |
46ef2188 MD |
933 | const uint64_t *current_chunk_id, time_t session_creation_time, |
934 | bool session_name_contains_creation_time) | |
2f77fc4b | 935 | { |
9a654598 | 936 | enum lttng_error_code status = LTTNG_OK; |
2f77fc4b | 937 | |
a0377dfe FD |
938 | LTTNG_ASSERT(consumer); |
939 | LTTNG_ASSERT(sock); | |
2f77fc4b | 940 | |
2f77fc4b | 941 | /* Sending control relayd socket. */ |
ffe60014 | 942 | if (!sock->control_sock_sent) { |
9a654598 | 943 | status = send_consumer_relayd_socket(session_id, |
d3e2ba59 | 944 | &consumer->dst.net.control, consumer, sock, |
6fa5fe7c | 945 | session_name, hostname, base_path, session_live_timer, |
46ef2188 MD |
946 | current_chunk_id, session_creation_time, |
947 | session_name_contains_creation_time); | |
9a654598 | 948 | if (status != LTTNG_OK) { |
c890b720 DG |
949 | goto error; |
950 | } | |
2f77fc4b DG |
951 | } |
952 | ||
953 | /* Sending data relayd socket. */ | |
ffe60014 | 954 | if (!sock->data_sock_sent) { |
9a654598 | 955 | status = send_consumer_relayd_socket(session_id, |
d3e2ba59 | 956 | &consumer->dst.net.data, consumer, sock, |
6fa5fe7c | 957 | session_name, hostname, base_path, session_live_timer, |
46ef2188 MD |
958 | current_chunk_id, session_creation_time, |
959 | session_name_contains_creation_time); | |
9a654598 | 960 | if (status != LTTNG_OK) { |
c890b720 DG |
961 | goto error; |
962 | } | |
2f77fc4b DG |
963 | } |
964 | ||
2f77fc4b | 965 | error: |
9a654598 | 966 | return status; |
2f77fc4b DG |
967 | } |
968 | ||
969 | /* | |
970 | * Setup relayd connections for a tracing session. First creates the socket to | |
971 | * the relayd and send them to the right domain consumer. Consumer type MUST be | |
972 | * network. | |
973 | */ | |
ffe60014 | 974 | int cmd_setup_relayd(struct ltt_session *session) |
2f77fc4b | 975 | { |
f73fabfd | 976 | int ret = LTTNG_OK; |
2f77fc4b DG |
977 | struct ltt_ust_session *usess; |
978 | struct ltt_kernel_session *ksess; | |
979 | struct consumer_socket *socket; | |
980 | struct lttng_ht_iter iter; | |
0e270a1e | 981 | LTTNG_OPTIONAL(uint64_t) current_chunk_id = {}; |
2f77fc4b | 982 | |
a0377dfe | 983 | LTTNG_ASSERT(session); |
2f77fc4b DG |
984 | |
985 | usess = session->ust_session; | |
986 | ksess = session->kernel_session; | |
987 | ||
785d2d0d | 988 | DBG("Setting relayd for session %s", session->name); |
2f77fc4b | 989 | |
aa997ea3 | 990 | rcu_read_lock(); |
1e791a74 JG |
991 | if (session->current_trace_chunk) { |
992 | enum lttng_trace_chunk_status status = lttng_trace_chunk_get_id( | |
993 | session->current_trace_chunk, ¤t_chunk_id.value); | |
994 | ||
995 | if (status == LTTNG_TRACE_CHUNK_STATUS_OK) { | |
996 | current_chunk_id.is_set = true; | |
997 | } else { | |
998 | ERR("Failed to get current trace chunk id"); | |
999 | ret = LTTNG_ERR_UNK; | |
1000 | goto error; | |
1001 | } | |
1002 | } | |
1003 | ||
2f77fc4b DG |
1004 | if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET |
1005 | && usess->consumer->enabled) { | |
1006 | /* For each consumer socket, send relayd sockets */ | |
1007 | cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, | |
1008 | socket, node.node) { | |
2f77fc4b | 1009 | pthread_mutex_lock(socket->lock); |
f46376a1 | 1010 | ret = send_consumer_relayd_sockets(session->id, |
d3e2ba59 JD |
1011 | usess->consumer, socket, |
1012 | session->name, session->hostname, | |
6fa5fe7c | 1013 | session->base_path, |
1e791a74 | 1014 | session->live_timer, |
db1da059 | 1015 | current_chunk_id.is_set ? ¤t_chunk_id.value : NULL, |
46ef2188 MD |
1016 | session->creation_time, |
1017 | session->name_contains_creation_time); | |
2f77fc4b | 1018 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1019 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1020 | goto error; |
1021 | } | |
6dc3064a DG |
1022 | /* Session is now ready for network streaming. */ |
1023 | session->net_handle = 1; | |
2f77fc4b | 1024 | } |
b31610f2 JD |
1025 | session->consumer->relay_major_version = |
1026 | usess->consumer->relay_major_version; | |
1027 | session->consumer->relay_minor_version = | |
1028 | usess->consumer->relay_minor_version; | |
eacb7b6f MD |
1029 | session->consumer->relay_allows_clear = |
1030 | usess->consumer->relay_allows_clear; | |
2f77fc4b DG |
1031 | } |
1032 | ||
1033 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET | |
1034 | && ksess->consumer->enabled) { | |
1035 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1036 | socket, node.node) { | |
2f77fc4b | 1037 | pthread_mutex_lock(socket->lock); |
f46376a1 | 1038 | ret = send_consumer_relayd_sockets(session->id, |
d3e2ba59 JD |
1039 | ksess->consumer, socket, |
1040 | session->name, session->hostname, | |
6fa5fe7c | 1041 | session->base_path, |
1e791a74 | 1042 | session->live_timer, |
db1da059 | 1043 | current_chunk_id.is_set ? ¤t_chunk_id.value : NULL, |
46ef2188 MD |
1044 | session->creation_time, |
1045 | session->name_contains_creation_time); | |
2f77fc4b | 1046 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1047 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1048 | goto error; |
1049 | } | |
6dc3064a DG |
1050 | /* Session is now ready for network streaming. */ |
1051 | session->net_handle = 1; | |
2f77fc4b | 1052 | } |
b31610f2 JD |
1053 | session->consumer->relay_major_version = |
1054 | ksess->consumer->relay_major_version; | |
1055 | session->consumer->relay_minor_version = | |
1056 | ksess->consumer->relay_minor_version; | |
eacb7b6f MD |
1057 | session->consumer->relay_allows_clear = |
1058 | ksess->consumer->relay_allows_clear; | |
2f77fc4b DG |
1059 | } |
1060 | ||
1061 | error: | |
e7fe706f | 1062 | rcu_read_unlock(); |
2f77fc4b DG |
1063 | return ret; |
1064 | } | |
1065 | ||
9b6c7ec5 DG |
1066 | /* |
1067 | * Start a kernel session by opening all necessary streams. | |
1068 | */ | |
4dbe1875 | 1069 | int start_kernel_session(struct ltt_kernel_session *ksess) |
9b6c7ec5 DG |
1070 | { |
1071 | int ret; | |
1072 | struct ltt_kernel_channel *kchan; | |
1073 | ||
1074 | /* Open kernel metadata */ | |
07b86b52 | 1075 | if (ksess->metadata == NULL && ksess->output_traces) { |
9b6c7ec5 DG |
1076 | ret = kernel_open_metadata(ksess); |
1077 | if (ret < 0) { | |
1078 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1079 | goto error; | |
1080 | } | |
1081 | } | |
1082 | ||
1083 | /* Open kernel metadata stream */ | |
07b86b52 | 1084 | if (ksess->metadata && ksess->metadata_stream_fd < 0) { |
9b6c7ec5 DG |
1085 | ret = kernel_open_metadata_stream(ksess); |
1086 | if (ret < 0) { | |
1087 | ERR("Kernel create metadata stream failed"); | |
1088 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1089 | goto error; | |
1090 | } | |
1091 | } | |
1092 | ||
1093 | /* For each channel */ | |
1094 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
1095 | if (kchan->stream_count == 0) { | |
1096 | ret = kernel_open_channel_stream(kchan); | |
1097 | if (ret < 0) { | |
1098 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1099 | goto error; | |
1100 | } | |
1101 | /* Update the stream global counter */ | |
1102 | ksess->stream_count_global += ret; | |
1103 | } | |
1104 | } | |
1105 | ||
1106 | /* Setup kernel consumer socket and send fds to it */ | |
1107 | ret = init_kernel_tracing(ksess); | |
e43c41c5 | 1108 | if (ret != 0) { |
9b6c7ec5 DG |
1109 | ret = LTTNG_ERR_KERN_START_FAIL; |
1110 | goto error; | |
1111 | } | |
1112 | ||
1113 | /* This start the kernel tracing */ | |
1114 | ret = kernel_start_session(ksess); | |
1115 | if (ret < 0) { | |
1116 | ret = LTTNG_ERR_KERN_START_FAIL; | |
1117 | goto error; | |
1118 | } | |
1119 | ||
1120 | /* Quiescent wait after starting trace */ | |
7d268848 | 1121 | kernel_wait_quiescent(); |
9b6c7ec5 | 1122 | |
14fb1ebe | 1123 | ksess->active = 1; |
9b6c7ec5 DG |
1124 | |
1125 | ret = LTTNG_OK; | |
1126 | ||
1127 | error: | |
1128 | return ret; | |
1129 | } | |
1130 | ||
4dbe1875 MD |
1131 | int stop_kernel_session(struct ltt_kernel_session *ksess) |
1132 | { | |
1133 | struct ltt_kernel_channel *kchan; | |
1134 | bool error_occurred = false; | |
1135 | int ret; | |
1136 | ||
1137 | if (!ksess || !ksess->active) { | |
1138 | return LTTNG_OK; | |
1139 | } | |
1140 | DBG("Stopping kernel tracing"); | |
1141 | ||
1142 | ret = kernel_stop_session(ksess); | |
1143 | if (ret < 0) { | |
1144 | ret = LTTNG_ERR_KERN_STOP_FAIL; | |
1145 | goto error; | |
1146 | } | |
1147 | ||
1148 | kernel_wait_quiescent(); | |
1149 | ||
1150 | /* Flush metadata after stopping (if exists) */ | |
1151 | if (ksess->metadata_stream_fd >= 0) { | |
1152 | ret = kernel_metadata_flush_buffer(ksess->metadata_stream_fd); | |
1153 | if (ret < 0) { | |
1154 | ERR("Kernel metadata flush failed"); | |
1155 | error_occurred = true; | |
1156 | } | |
1157 | } | |
1158 | ||
1159 | /* Flush all buffers after stopping */ | |
1160 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
1161 | ret = kernel_flush_buffer(kchan); | |
1162 | if (ret < 0) { | |
1163 | ERR("Kernel flush buffer error"); | |
1164 | error_occurred = true; | |
1165 | } | |
1166 | } | |
1167 | ||
1168 | ksess->active = 0; | |
1169 | if (error_occurred) { | |
1170 | ret = LTTNG_ERR_UNK; | |
1171 | } else { | |
1172 | ret = LTTNG_OK; | |
1173 | } | |
1174 | error: | |
1175 | return ret; | |
1176 | } | |
1177 | ||
2f77fc4b DG |
1178 | /* |
1179 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. | |
1180 | */ | |
56a37563 JG |
1181 | int cmd_disable_channel(struct ltt_session *session, |
1182 | enum lttng_domain_type domain, char *channel_name) | |
2f77fc4b DG |
1183 | { |
1184 | int ret; | |
1185 | struct ltt_ust_session *usess; | |
1186 | ||
1187 | usess = session->ust_session; | |
1188 | ||
2223c96f DG |
1189 | rcu_read_lock(); |
1190 | ||
2f77fc4b DG |
1191 | switch (domain) { |
1192 | case LTTNG_DOMAIN_KERNEL: | |
1193 | { | |
1194 | ret = channel_kernel_disable(session->kernel_session, | |
1195 | channel_name); | |
f73fabfd | 1196 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1197 | goto error; |
1198 | } | |
1199 | ||
7d268848 | 1200 | kernel_wait_quiescent(); |
2f77fc4b DG |
1201 | break; |
1202 | } | |
1203 | case LTTNG_DOMAIN_UST: | |
1204 | { | |
1205 | struct ltt_ust_channel *uchan; | |
1206 | struct lttng_ht *chan_ht; | |
1207 | ||
1208 | chan_ht = usess->domain_global.channels; | |
1209 | ||
1210 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
1211 | if (uchan == NULL) { | |
f73fabfd | 1212 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
1213 | goto error; |
1214 | } | |
1215 | ||
7972aab2 | 1216 | ret = channel_ust_disable(usess, uchan); |
f73fabfd | 1217 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1218 | goto error; |
1219 | } | |
1220 | break; | |
1221 | } | |
2f77fc4b | 1222 | default: |
f73fabfd | 1223 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1224 | goto error; |
1225 | } | |
1226 | ||
f73fabfd | 1227 | ret = LTTNG_OK; |
2f77fc4b DG |
1228 | |
1229 | error: | |
2223c96f | 1230 | rcu_read_unlock(); |
2f77fc4b DG |
1231 | return ret; |
1232 | } | |
1233 | ||
1234 | /* | |
1235 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
1236 | * | |
1237 | * The wpipe arguments is used as a notifier for the kernel thread. | |
1238 | */ | |
999af9c1 JR |
1239 | int cmd_enable_channel(struct command_ctx *cmd_ctx, int sock, int wpipe) |
1240 | { | |
1241 | int ret; | |
1242 | size_t channel_len; | |
1243 | ssize_t sock_recv_len; | |
1244 | struct lttng_channel *channel = NULL; | |
1245 | struct lttng_buffer_view view; | |
1246 | struct lttng_dynamic_buffer channel_buffer; | |
1247 | const struct lttng_domain command_domain = cmd_ctx->lsm.domain; | |
1248 | ||
1249 | lttng_dynamic_buffer_init(&channel_buffer); | |
1250 | channel_len = (size_t) cmd_ctx->lsm.u.channel.length; | |
1251 | ret = lttng_dynamic_buffer_set_size(&channel_buffer, channel_len); | |
1252 | if (ret) { | |
1253 | ret = LTTNG_ERR_NOMEM; | |
1254 | goto end; | |
1255 | } | |
1256 | ||
1257 | sock_recv_len = lttcomm_recv_unix_sock(sock, channel_buffer.data, | |
1258 | channel_len); | |
1259 | if (sock_recv_len < 0 || sock_recv_len != channel_len) { | |
1260 | ERR("Failed to receive \"enable channel\" command payload"); | |
1261 | ret = LTTNG_ERR_INVALID; | |
1262 | goto end; | |
1263 | } | |
1264 | ||
1265 | view = lttng_buffer_view_from_dynamic_buffer(&channel_buffer, 0, channel_len); | |
1266 | if (!lttng_buffer_view_is_valid(&view)) { | |
1267 | ret = LTTNG_ERR_INVALID; | |
1268 | goto end; | |
1269 | } | |
1270 | ||
1271 | if (lttng_channel_create_from_buffer(&view, &channel) != channel_len) { | |
1272 | ERR("Invalid channel payload received in \"enable channel\" command"); | |
1273 | ret = LTTNG_ERR_INVALID; | |
1274 | goto end; | |
1275 | } | |
1276 | ||
1277 | ret = cmd_enable_channel_internal( | |
1278 | cmd_ctx->session, &command_domain, channel, wpipe); | |
1279 | ||
1280 | end: | |
1281 | lttng_dynamic_buffer_reset(&channel_buffer); | |
1282 | lttng_channel_destroy(channel); | |
1283 | return ret; | |
1284 | } | |
1285 | ||
4878de5c JG |
1286 | static enum lttng_error_code cmd_enable_channel_internal( |
1287 | struct ltt_session *session, | |
999af9c1 JR |
1288 | const struct lttng_domain *domain, |
1289 | const struct lttng_channel *_attr, | |
1290 | int wpipe) | |
2f77fc4b | 1291 | { |
4878de5c | 1292 | enum lttng_error_code ret_code; |
2f77fc4b DG |
1293 | struct ltt_ust_session *usess = session->ust_session; |
1294 | struct lttng_ht *chan_ht; | |
1f345e94 | 1295 | size_t len; |
999af9c1 | 1296 | struct lttng_channel *attr = NULL; |
2f77fc4b | 1297 | |
a0377dfe FD |
1298 | LTTNG_ASSERT(session); |
1299 | LTTNG_ASSERT(_attr); | |
1300 | LTTNG_ASSERT(domain); | |
2f77fc4b | 1301 | |
999af9c1 JR |
1302 | attr = lttng_channel_copy(_attr); |
1303 | if (!attr) { | |
4878de5c | 1304 | ret_code = LTTNG_ERR_NOMEM; |
999af9c1 JR |
1305 | goto end; |
1306 | } | |
1307 | ||
1308 | len = lttng_strnlen(attr->name, sizeof(attr->name)); | |
1f345e94 PP |
1309 | |
1310 | /* Validate channel name */ | |
999af9c1 JR |
1311 | if (attr->name[0] == '.' || |
1312 | memchr(attr->name, '/', len) != NULL) { | |
4878de5c | 1313 | ret_code = LTTNG_ERR_INVALID_CHANNEL_NAME; |
1f345e94 PP |
1314 | goto end; |
1315 | } | |
1316 | ||
999af9c1 | 1317 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
2f77fc4b | 1318 | |
03b4fdcf DG |
1319 | rcu_read_lock(); |
1320 | ||
ecc48a90 JD |
1321 | /* |
1322 | * If the session is a live session, remove the switch timer, the | |
1323 | * live timer does the same thing but sends also synchronisation | |
1324 | * beacons for inactive streams. | |
1325 | */ | |
1326 | if (session->live_timer > 0) { | |
999af9c1 JR |
1327 | attr->attr.live_timer_interval = session->live_timer; |
1328 | attr->attr.switch_timer_interval = 0; | |
ecc48a90 JD |
1329 | } |
1330 | ||
6e21424e JR |
1331 | /* Check for feature support */ |
1332 | switch (domain->type) { | |
1333 | case LTTNG_DOMAIN_KERNEL: | |
1334 | { | |
7d268848 | 1335 | if (kernel_supports_ring_buffer_snapshot_sample_positions() != 1) { |
6e21424e JR |
1336 | /* Sampling position of buffer is not supported */ |
1337 | WARN("Kernel tracer does not support buffer monitoring. " | |
1338 | "Setting the monitor interval timer to 0 " | |
1339 | "(disabled) for channel '%s' of session '%s'", | |
999af9c1 JR |
1340 | attr->name, session->name); |
1341 | lttng_channel_set_monitor_timer_interval(attr, 0); | |
6e21424e JR |
1342 | } |
1343 | break; | |
1344 | } | |
1345 | case LTTNG_DOMAIN_UST: | |
f28f9e44 | 1346 | break; |
6e21424e JR |
1347 | case LTTNG_DOMAIN_JUL: |
1348 | case LTTNG_DOMAIN_LOG4J: | |
1349 | case LTTNG_DOMAIN_PYTHON: | |
f28f9e44 JG |
1350 | if (!agent_tracing_is_enabled()) { |
1351 | DBG("Attempted to enable a channel in an agent domain but the agent thread is not running"); | |
4878de5c | 1352 | ret_code = LTTNG_ERR_AGENT_TRACING_DISABLED; |
f28f9e44 JG |
1353 | goto error; |
1354 | } | |
6e21424e JR |
1355 | break; |
1356 | default: | |
4878de5c | 1357 | ret_code = LTTNG_ERR_UNKNOWN_DOMAIN; |
6e21424e JR |
1358 | goto error; |
1359 | } | |
1360 | ||
7972aab2 | 1361 | switch (domain->type) { |
2f77fc4b DG |
1362 | case LTTNG_DOMAIN_KERNEL: |
1363 | { | |
1364 | struct ltt_kernel_channel *kchan; | |
1365 | ||
999af9c1 JR |
1366 | kchan = trace_kernel_get_channel_by_name( |
1367 | attr->name, session->kernel_session); | |
2f77fc4b | 1368 | if (kchan == NULL) { |
8cc65d5c JR |
1369 | /* |
1370 | * Don't try to create a channel if the session has been started at | |
1371 | * some point in time before. The tracer does not allow it. | |
1372 | */ | |
1373 | if (session->has_been_started) { | |
4878de5c | 1374 | ret_code = LTTNG_ERR_TRACE_ALREADY_STARTED; |
8cc65d5c JR |
1375 | goto error; |
1376 | } | |
1377 | ||
54213acc JG |
1378 | if (session->snapshot.nb_output > 0 || |
1379 | session->snapshot_mode) { | |
1380 | /* Enforce mmap output for snapshot sessions. */ | |
999af9c1 | 1381 | attr->attr.output = LTTNG_EVENT_MMAP; |
54213acc | 1382 | } |
4878de5c | 1383 | ret_code = channel_kernel_create( |
999af9c1 JR |
1384 | session->kernel_session, attr, wpipe); |
1385 | if (attr->name[0] != '\0') { | |
85076754 MD |
1386 | session->kernel_session->has_non_default_channel = 1; |
1387 | } | |
2f77fc4b | 1388 | } else { |
4878de5c | 1389 | ret_code = channel_kernel_enable(session->kernel_session, kchan); |
2f77fc4b DG |
1390 | } |
1391 | ||
4878de5c | 1392 | if (ret_code != LTTNG_OK) { |
2f77fc4b DG |
1393 | goto error; |
1394 | } | |
1395 | ||
7d268848 | 1396 | kernel_wait_quiescent(); |
2f77fc4b DG |
1397 | break; |
1398 | } | |
1399 | case LTTNG_DOMAIN_UST: | |
9232818f JG |
1400 | case LTTNG_DOMAIN_JUL: |
1401 | case LTTNG_DOMAIN_LOG4J: | |
1402 | case LTTNG_DOMAIN_PYTHON: | |
2f77fc4b DG |
1403 | { |
1404 | struct ltt_ust_channel *uchan; | |
1405 | ||
9232818f JG |
1406 | /* |
1407 | * FIXME | |
1408 | * | |
1409 | * Current agent implementation limitations force us to allow | |
1410 | * only one channel at once in "agent" subdomains. Each | |
1411 | * subdomain has a default channel name which must be strictly | |
1412 | * adhered to. | |
1413 | */ | |
1414 | if (domain->type == LTTNG_DOMAIN_JUL) { | |
999af9c1 | 1415 | if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME, |
9232818f | 1416 | LTTNG_SYMBOL_NAME_LEN)) { |
4878de5c | 1417 | ret_code = LTTNG_ERR_INVALID_CHANNEL_NAME; |
9232818f JG |
1418 | goto error; |
1419 | } | |
1420 | } else if (domain->type == LTTNG_DOMAIN_LOG4J) { | |
999af9c1 | 1421 | if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME, |
9232818f | 1422 | LTTNG_SYMBOL_NAME_LEN)) { |
4878de5c | 1423 | ret_code = LTTNG_ERR_INVALID_CHANNEL_NAME; |
9232818f JG |
1424 | goto error; |
1425 | } | |
1426 | } else if (domain->type == LTTNG_DOMAIN_PYTHON) { | |
999af9c1 | 1427 | if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME, |
9232818f | 1428 | LTTNG_SYMBOL_NAME_LEN)) { |
4878de5c | 1429 | ret_code = LTTNG_ERR_INVALID_CHANNEL_NAME; |
9232818f JG |
1430 | goto error; |
1431 | } | |
1432 | } | |
1433 | ||
2f77fc4b DG |
1434 | chan_ht = usess->domain_global.channels; |
1435 | ||
999af9c1 | 1436 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); |
2f77fc4b | 1437 | if (uchan == NULL) { |
8cc65d5c JR |
1438 | /* |
1439 | * Don't try to create a channel if the session has been started at | |
1440 | * some point in time before. The tracer does not allow it. | |
1441 | */ | |
1442 | if (session->has_been_started) { | |
4878de5c | 1443 | ret_code = LTTNG_ERR_TRACE_ALREADY_STARTED; |
8cc65d5c JR |
1444 | goto error; |
1445 | } | |
1446 | ||
4878de5c | 1447 | ret_code = channel_ust_create(usess, attr, domain->buf_type); |
999af9c1 | 1448 | if (attr->name[0] != '\0') { |
85076754 MD |
1449 | usess->has_non_default_channel = 1; |
1450 | } | |
2f77fc4b | 1451 | } else { |
4878de5c | 1452 | ret_code = channel_ust_enable(usess, uchan); |
2f77fc4b DG |
1453 | } |
1454 | break; | |
1455 | } | |
2f77fc4b | 1456 | default: |
4878de5c | 1457 | ret_code = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1458 | goto error; |
1459 | } | |
1460 | ||
4878de5c | 1461 | if (ret_code == LTTNG_OK && attr->attr.output != LTTNG_EVENT_MMAP) { |
54213acc JG |
1462 | session->has_non_mmap_channel = true; |
1463 | } | |
2f77fc4b | 1464 | error: |
2223c96f | 1465 | rcu_read_unlock(); |
1f345e94 | 1466 | end: |
999af9c1 | 1467 | lttng_channel_destroy(attr); |
4878de5c | 1468 | return ret_code; |
2f77fc4b DG |
1469 | } |
1470 | ||
159b042f JG |
1471 | enum lttng_error_code cmd_process_attr_tracker_get_tracking_policy( |
1472 | struct ltt_session *session, | |
1473 | enum lttng_domain_type domain, | |
1474 | enum lttng_process_attr process_attr, | |
1475 | enum lttng_tracking_policy *policy) | |
1476 | { | |
1477 | enum lttng_error_code ret_code = LTTNG_OK; | |
1478 | const struct process_attr_tracker *tracker; | |
1479 | ||
1480 | switch (domain) { | |
1481 | case LTTNG_DOMAIN_KERNEL: | |
1482 | if (!session->kernel_session) { | |
1483 | ret_code = LTTNG_ERR_INVALID; | |
1484 | goto end; | |
1485 | } | |
1486 | tracker = kernel_get_process_attr_tracker( | |
1487 | session->kernel_session, process_attr); | |
1488 | break; | |
1489 | case LTTNG_DOMAIN_UST: | |
1490 | if (!session->ust_session) { | |
1491 | ret_code = LTTNG_ERR_INVALID; | |
1492 | goto end; | |
1493 | } | |
1494 | tracker = trace_ust_get_process_attr_tracker( | |
1495 | session->ust_session, process_attr); | |
1496 | break; | |
1497 | default: | |
1498 | ret_code = LTTNG_ERR_UNSUPPORTED_DOMAIN; | |
1499 | goto end; | |
1500 | } | |
1501 | if (tracker) { | |
1502 | *policy = process_attr_tracker_get_tracking_policy(tracker); | |
1503 | } else { | |
1504 | ret_code = LTTNG_ERR_INVALID; | |
1505 | } | |
1506 | end: | |
1507 | return ret_code; | |
1508 | } | |
1509 | ||
1510 | enum lttng_error_code cmd_process_attr_tracker_set_tracking_policy( | |
1511 | struct ltt_session *session, | |
1512 | enum lttng_domain_type domain, | |
1513 | enum lttng_process_attr process_attr, | |
1514 | enum lttng_tracking_policy policy) | |
1515 | { | |
1516 | enum lttng_error_code ret_code = LTTNG_OK; | |
1517 | ||
1518 | switch (policy) { | |
1519 | case LTTNG_TRACKING_POLICY_INCLUDE_SET: | |
1520 | case LTTNG_TRACKING_POLICY_EXCLUDE_ALL: | |
1521 | case LTTNG_TRACKING_POLICY_INCLUDE_ALL: | |
1522 | break; | |
1523 | default: | |
1524 | ret_code = LTTNG_ERR_INVALID; | |
1525 | goto end; | |
1526 | } | |
1527 | ||
1528 | switch (domain) { | |
1529 | case LTTNG_DOMAIN_KERNEL: | |
1530 | if (!session->kernel_session) { | |
1531 | ret_code = LTTNG_ERR_INVALID; | |
1532 | goto end; | |
1533 | } | |
1534 | ret_code = kernel_process_attr_tracker_set_tracking_policy( | |
1535 | session->kernel_session, process_attr, policy); | |
1536 | break; | |
1537 | case LTTNG_DOMAIN_UST: | |
1538 | if (!session->ust_session) { | |
1539 | ret_code = LTTNG_ERR_INVALID; | |
1540 | goto end; | |
1541 | } | |
1542 | ret_code = trace_ust_process_attr_tracker_set_tracking_policy( | |
1543 | session->ust_session, process_attr, policy); | |
1544 | break; | |
1545 | default: | |
1546 | ret_code = LTTNG_ERR_UNSUPPORTED_DOMAIN; | |
1547 | break; | |
1548 | } | |
1549 | end: | |
1550 | return ret_code; | |
1551 | } | |
1552 | ||
1553 | enum lttng_error_code cmd_process_attr_tracker_inclusion_set_add_value( | |
1554 | struct ltt_session *session, | |
1555 | enum lttng_domain_type domain, | |
1556 | enum lttng_process_attr process_attr, | |
1557 | const struct process_attr_value *value) | |
1558 | { | |
1559 | enum lttng_error_code ret_code = LTTNG_OK; | |
1560 | ||
1561 | switch (domain) { | |
1562 | case LTTNG_DOMAIN_KERNEL: | |
1563 | if (!session->kernel_session) { | |
1564 | ret_code = LTTNG_ERR_INVALID; | |
1565 | goto end; | |
1566 | } | |
1567 | ret_code = kernel_process_attr_tracker_inclusion_set_add_value( | |
1568 | session->kernel_session, process_attr, value); | |
1569 | break; | |
1570 | case LTTNG_DOMAIN_UST: | |
1571 | if (!session->ust_session) { | |
1572 | ret_code = LTTNG_ERR_INVALID; | |
1573 | goto end; | |
1574 | } | |
1575 | ret_code = trace_ust_process_attr_tracker_inclusion_set_add_value( | |
1576 | session->ust_session, process_attr, value); | |
1577 | break; | |
1578 | default: | |
1579 | ret_code = LTTNG_ERR_UNSUPPORTED_DOMAIN; | |
1580 | break; | |
1581 | } | |
1582 | end: | |
1583 | return ret_code; | |
1584 | } | |
1585 | ||
1586 | enum lttng_error_code cmd_process_attr_tracker_inclusion_set_remove_value( | |
1587 | struct ltt_session *session, | |
1588 | enum lttng_domain_type domain, | |
1589 | enum lttng_process_attr process_attr, | |
1590 | const struct process_attr_value *value) | |
1591 | { | |
1592 | enum lttng_error_code ret_code = LTTNG_OK; | |
1593 | ||
1594 | switch (domain) { | |
1595 | case LTTNG_DOMAIN_KERNEL: | |
1596 | if (!session->kernel_session) { | |
1597 | ret_code = LTTNG_ERR_INVALID; | |
1598 | goto end; | |
1599 | } | |
1600 | ret_code = kernel_process_attr_tracker_inclusion_set_remove_value( | |
1601 | session->kernel_session, process_attr, value); | |
1602 | break; | |
1603 | case LTTNG_DOMAIN_UST: | |
1604 | if (!session->ust_session) { | |
1605 | ret_code = LTTNG_ERR_INVALID; | |
1606 | goto end; | |
1607 | } | |
1608 | ret_code = trace_ust_process_attr_tracker_inclusion_set_remove_value( | |
1609 | session->ust_session, process_attr, value); | |
1610 | break; | |
1611 | default: | |
1612 | ret_code = LTTNG_ERR_UNSUPPORTED_DOMAIN; | |
1613 | break; | |
1614 | } | |
1615 | end: | |
1616 | return ret_code; | |
1617 | } | |
1618 | ||
1619 | enum lttng_error_code cmd_process_attr_tracker_get_inclusion_set( | |
1620 | struct ltt_session *session, | |
1621 | enum lttng_domain_type domain, | |
1622 | enum lttng_process_attr process_attr, | |
1623 | struct lttng_process_attr_values **values) | |
1624 | { | |
1625 | enum lttng_error_code ret_code = LTTNG_OK; | |
1626 | const struct process_attr_tracker *tracker; | |
1627 | enum process_attr_tracker_status status; | |
1628 | ||
1629 | switch (domain) { | |
1630 | case LTTNG_DOMAIN_KERNEL: | |
1631 | if (!session->kernel_session) { | |
1632 | ret_code = LTTNG_ERR_INVALID; | |
1633 | goto end; | |
1634 | } | |
1635 | tracker = kernel_get_process_attr_tracker( | |
1636 | session->kernel_session, process_attr); | |
1637 | break; | |
1638 | case LTTNG_DOMAIN_UST: | |
1639 | if (!session->ust_session) { | |
1640 | ret_code = LTTNG_ERR_INVALID; | |
1641 | goto end; | |
1642 | } | |
1643 | tracker = trace_ust_get_process_attr_tracker( | |
1644 | session->ust_session, process_attr); | |
1645 | break; | |
1646 | default: | |
1647 | ret_code = LTTNG_ERR_UNSUPPORTED_DOMAIN; | |
1648 | goto end; | |
1649 | } | |
1650 | ||
1651 | if (!tracker) { | |
1652 | ret_code = LTTNG_ERR_INVALID; | |
1653 | goto end; | |
1654 | } | |
1655 | ||
1656 | status = process_attr_tracker_get_inclusion_set(tracker, values); | |
1657 | switch (status) { | |
1658 | case PROCESS_ATTR_TRACKER_STATUS_OK: | |
1659 | ret_code = LTTNG_OK; | |
1660 | break; | |
1661 | case PROCESS_ATTR_TRACKER_STATUS_INVALID_TRACKING_POLICY: | |
1662 | ret_code = LTTNG_ERR_PROCESS_ATTR_TRACKER_INVALID_TRACKING_POLICY; | |
1663 | break; | |
1664 | case PROCESS_ATTR_TRACKER_STATUS_ERROR: | |
1665 | ret_code = LTTNG_ERR_NOMEM; | |
1666 | break; | |
1667 | default: | |
1668 | ret_code = LTTNG_ERR_UNK; | |
1669 | break; | |
1670 | } | |
1671 | ||
1672 | end: | |
1673 | return ret_code; | |
1674 | } | |
1675 | ||
2f77fc4b DG |
1676 | /* |
1677 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1678 | */ | |
8ddd72ef JR |
1679 | int cmd_disable_event(struct command_ctx *cmd_ctx, |
1680 | struct lttng_event *event, | |
1681 | char *filter_expression, | |
1682 | struct lttng_bytecode *bytecode, | |
1683 | struct lttng_event_exclusion *exclusion) | |
2f77fc4b DG |
1684 | { |
1685 | int ret; | |
df4f5a87 | 1686 | const char *event_name; |
8ddd72ef JR |
1687 | const struct ltt_session *session = cmd_ctx->session; |
1688 | const char *channel_name = cmd_ctx->lsm.u.disable.channel_name; | |
1689 | const enum lttng_domain_type domain = cmd_ctx->lsm.domain.type; | |
6e911cad | 1690 | |
18a720cd MD |
1691 | DBG("Disable event command for event \'%s\'", event->name); |
1692 | ||
8ddd72ef JR |
1693 | /* |
1694 | * Filter and exclusions are simply not handled by the | |
1695 | * disable event command at this time. | |
1696 | * | |
1697 | * FIXME | |
1698 | */ | |
1699 | (void) filter_expression; | |
1700 | (void) exclusion; | |
1701 | ||
1702 | /* Ignore the presence of filter or exclusion for the event */ | |
1703 | event->filter = 0; | |
1704 | event->exclusion = 0; | |
1705 | ||
6e911cad MD |
1706 | event_name = event->name; |
1707 | ||
9b7431cf JG |
1708 | /* Error out on unhandled search criteria */ |
1709 | if (event->loglevel_type || event->loglevel != -1 || event->enabled | |
6e911cad | 1710 | || event->pid || event->filter || event->exclusion) { |
7076b56e JG |
1711 | ret = LTTNG_ERR_UNK; |
1712 | goto error; | |
6e911cad | 1713 | } |
2f77fc4b | 1714 | |
2223c96f DG |
1715 | rcu_read_lock(); |
1716 | ||
2f77fc4b DG |
1717 | switch (domain) { |
1718 | case LTTNG_DOMAIN_KERNEL: | |
1719 | { | |
1720 | struct ltt_kernel_channel *kchan; | |
1721 | struct ltt_kernel_session *ksess; | |
1722 | ||
1723 | ksess = session->kernel_session; | |
1724 | ||
85076754 MD |
1725 | /* |
1726 | * If a non-default channel has been created in the | |
1727 | * session, explicitely require that -c chan_name needs | |
1728 | * to be provided. | |
1729 | */ | |
1730 | if (ksess->has_non_default_channel && channel_name[0] == '\0') { | |
1731 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1732 | goto error_unlock; |
85076754 MD |
1733 | } |
1734 | ||
2f77fc4b DG |
1735 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
1736 | if (kchan == NULL) { | |
f73fabfd | 1737 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
7076b56e | 1738 | goto error_unlock; |
2f77fc4b DG |
1739 | } |
1740 | ||
6e911cad MD |
1741 | switch (event->type) { |
1742 | case LTTNG_EVENT_ALL: | |
9550ee81 | 1743 | case LTTNG_EVENT_TRACEPOINT: |
d0ae4ea8 | 1744 | case LTTNG_EVENT_SYSCALL: |
9550ee81 JR |
1745 | case LTTNG_EVENT_PROBE: |
1746 | case LTTNG_EVENT_FUNCTION: | |
1747 | case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */ | |
1748 | if (event_name[0] == '\0') { | |
1749 | ret = event_kernel_disable_event(kchan, | |
1750 | NULL, event->type); | |
29c62722 | 1751 | } else { |
d0ae4ea8 | 1752 | ret = event_kernel_disable_event(kchan, |
9550ee81 | 1753 | event_name, event->type); |
29c62722 | 1754 | } |
6e911cad | 1755 | if (ret != LTTNG_OK) { |
7076b56e | 1756 | goto error_unlock; |
6e911cad MD |
1757 | } |
1758 | break; | |
6e911cad MD |
1759 | default: |
1760 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1761 | goto error_unlock; |
2f77fc4b DG |
1762 | } |
1763 | ||
7d268848 | 1764 | kernel_wait_quiescent(); |
2f77fc4b DG |
1765 | break; |
1766 | } | |
1767 | case LTTNG_DOMAIN_UST: | |
1768 | { | |
1769 | struct ltt_ust_channel *uchan; | |
1770 | struct ltt_ust_session *usess; | |
1771 | ||
1772 | usess = session->ust_session; | |
1773 | ||
7076b56e JG |
1774 | if (validate_ust_event_name(event_name)) { |
1775 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1776 | goto error_unlock; | |
1777 | } | |
1778 | ||
85076754 MD |
1779 | /* |
1780 | * If a non-default channel has been created in the | |
9550ee81 | 1781 | * session, explicitly require that -c chan_name needs |
85076754 MD |
1782 | * to be provided. |
1783 | */ | |
1784 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1785 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1786 | goto error_unlock; |
85076754 MD |
1787 | } |
1788 | ||
2f77fc4b DG |
1789 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
1790 | channel_name); | |
1791 | if (uchan == NULL) { | |
f73fabfd | 1792 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
7076b56e | 1793 | goto error_unlock; |
2f77fc4b DG |
1794 | } |
1795 | ||
6e911cad MD |
1796 | switch (event->type) { |
1797 | case LTTNG_EVENT_ALL: | |
b3639870 JR |
1798 | /* |
1799 | * An empty event name means that everything | |
1800 | * should be disabled. | |
1801 | */ | |
1802 | if (event->name[0] == '\0') { | |
1803 | ret = event_ust_disable_all_tracepoints(usess, uchan); | |
77d536b2 JR |
1804 | } else { |
1805 | ret = event_ust_disable_tracepoint(usess, uchan, | |
1806 | event_name); | |
1807 | } | |
6e911cad | 1808 | if (ret != LTTNG_OK) { |
7076b56e | 1809 | goto error_unlock; |
6e911cad MD |
1810 | } |
1811 | break; | |
1812 | default: | |
1813 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1814 | goto error_unlock; |
2f77fc4b DG |
1815 | } |
1816 | ||
1817 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
1818 | channel_name); | |
1819 | break; | |
1820 | } | |
5cdb6027 | 1821 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1822 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1823 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1824 | { |
fefd409b | 1825 | struct agent *agt; |
f20baf8e DG |
1826 | struct ltt_ust_session *usess = session->ust_session; |
1827 | ||
a0377dfe | 1828 | LTTNG_ASSERT(usess); |
f20baf8e | 1829 | |
6e911cad MD |
1830 | switch (event->type) { |
1831 | case LTTNG_EVENT_ALL: | |
1832 | break; | |
1833 | default: | |
1834 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1835 | goto error_unlock; |
6e911cad MD |
1836 | } |
1837 | ||
5cdb6027 | 1838 | agt = trace_ust_find_agent(usess, domain); |
fefd409b DG |
1839 | if (!agt) { |
1840 | ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
7076b56e | 1841 | goto error_unlock; |
fefd409b | 1842 | } |
b3639870 JR |
1843 | /* |
1844 | * An empty event name means that everything | |
1845 | * should be disabled. | |
1846 | */ | |
1847 | if (event->name[0] == '\0') { | |
18a720cd MD |
1848 | ret = event_agent_disable_all(usess, agt); |
1849 | } else { | |
1850 | ret = event_agent_disable(usess, agt, event_name); | |
1851 | } | |
f20baf8e | 1852 | if (ret != LTTNG_OK) { |
7076b56e | 1853 | goto error_unlock; |
f20baf8e DG |
1854 | } |
1855 | ||
1856 | break; | |
1857 | } | |
2f77fc4b | 1858 | default: |
f73fabfd | 1859 | ret = LTTNG_ERR_UND; |
7076b56e | 1860 | goto error_unlock; |
2f77fc4b DG |
1861 | } |
1862 | ||
f73fabfd | 1863 | ret = LTTNG_OK; |
2f77fc4b | 1864 | |
7076b56e | 1865 | error_unlock: |
2223c96f | 1866 | rcu_read_unlock(); |
7076b56e | 1867 | error: |
8ddd72ef JR |
1868 | free(exclusion); |
1869 | free(bytecode); | |
1870 | free(filter_expression); | |
2f77fc4b DG |
1871 | return ret; |
1872 | } | |
1873 | ||
2f77fc4b DG |
1874 | /* |
1875 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1876 | */ | |
26e1c61f JR |
1877 | int cmd_add_context(struct command_ctx *cmd_ctx, |
1878 | const struct lttng_event_context *event_context, int kwpipe) | |
2f77fc4b | 1879 | { |
d5979e4a | 1880 | int ret, chan_kern_created = 0, chan_ust_created = 0; |
26e1c61f JR |
1881 | const enum lttng_domain_type domain = cmd_ctx->lsm.domain.type; |
1882 | const struct ltt_session *session = cmd_ctx->session; | |
1883 | const char *channel_name = cmd_ctx->lsm.u.context.channel_name; | |
bdf64013 | 1884 | |
9a699f7b JR |
1885 | /* |
1886 | * Don't try to add a context if the session has been started at | |
1887 | * some point in time before. The tracer does not allow it and would | |
1888 | * result in a corrupted trace. | |
1889 | */ | |
26e1c61f | 1890 | if (cmd_ctx->session->has_been_started) { |
9a699f7b JR |
1891 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
1892 | goto end; | |
1893 | } | |
1894 | ||
2f77fc4b DG |
1895 | switch (domain) { |
1896 | case LTTNG_DOMAIN_KERNEL: | |
a0377dfe | 1897 | LTTNG_ASSERT(session->kernel_session); |
979e618e DG |
1898 | |
1899 | if (session->kernel_session->channel_count == 0) { | |
1900 | /* Create default channel */ | |
1901 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); | |
1902 | if (ret != LTTNG_OK) { | |
1903 | goto error; | |
1904 | } | |
d5979e4a | 1905 | chan_kern_created = 1; |
979e618e | 1906 | } |
2f77fc4b | 1907 | /* Add kernel context to kernel tracer */ |
26e1c61f JR |
1908 | ret = context_kernel_add(session->kernel_session, |
1909 | event_context, channel_name); | |
f73fabfd | 1910 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1911 | goto error; |
1912 | } | |
1913 | break; | |
bdf64013 JG |
1914 | case LTTNG_DOMAIN_JUL: |
1915 | case LTTNG_DOMAIN_LOG4J: | |
1916 | { | |
1917 | /* | |
1918 | * Validate channel name. | |
1919 | * If no channel name is given and the domain is JUL or LOG4J, | |
1920 | * set it to the appropriate domain-specific channel name. If | |
1921 | * a name is provided but does not match the expexted channel | |
1922 | * name, return an error. | |
1923 | */ | |
1924 | if (domain == LTTNG_DOMAIN_JUL && *channel_name && | |
1925 | strcmp(channel_name, | |
1926 | DEFAULT_JUL_CHANNEL_NAME)) { | |
1927 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1928 | goto error; | |
1929 | } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name && | |
1930 | strcmp(channel_name, | |
1931 | DEFAULT_LOG4J_CHANNEL_NAME)) { | |
1932 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1933 | goto error; | |
1934 | } | |
1935 | } | |
30eb3927 | 1936 | /* fall through */ |
2f77fc4b DG |
1937 | case LTTNG_DOMAIN_UST: |
1938 | { | |
1939 | struct ltt_ust_session *usess = session->ust_session; | |
85076754 MD |
1940 | unsigned int chan_count; |
1941 | ||
a0377dfe | 1942 | LTTNG_ASSERT(usess); |
2f77fc4b | 1943 | |
85076754 | 1944 | chan_count = lttng_ht_get_count(usess->domain_global.channels); |
979e618e DG |
1945 | if (chan_count == 0) { |
1946 | struct lttng_channel *attr; | |
1947 | /* Create default channel */ | |
0a9c6494 | 1948 | attr = channel_new_default_attr(domain, usess->buffer_type); |
979e618e DG |
1949 | if (attr == NULL) { |
1950 | ret = LTTNG_ERR_FATAL; | |
1951 | goto error; | |
1952 | } | |
1953 | ||
7972aab2 | 1954 | ret = channel_ust_create(usess, attr, usess->buffer_type); |
979e618e DG |
1955 | if (ret != LTTNG_OK) { |
1956 | free(attr); | |
1957 | goto error; | |
1958 | } | |
cf0bcb51 | 1959 | channel_attr_destroy(attr); |
d5979e4a | 1960 | chan_ust_created = 1; |
979e618e DG |
1961 | } |
1962 | ||
26e1c61f JR |
1963 | ret = context_ust_add(usess, domain, event_context, |
1964 | channel_name); | |
f73fabfd | 1965 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1966 | goto error; |
1967 | } | |
1968 | break; | |
1969 | } | |
2f77fc4b | 1970 | default: |
f73fabfd | 1971 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1972 | goto error; |
1973 | } | |
1974 | ||
bdf64013 JG |
1975 | ret = LTTNG_OK; |
1976 | goto end; | |
2f77fc4b DG |
1977 | |
1978 | error: | |
d5979e4a DG |
1979 | if (chan_kern_created) { |
1980 | struct ltt_kernel_channel *kchan = | |
1981 | trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME, | |
1982 | session->kernel_session); | |
1983 | /* Created previously, this should NOT fail. */ | |
a0377dfe | 1984 | LTTNG_ASSERT(kchan); |
d5979e4a DG |
1985 | kernel_destroy_channel(kchan); |
1986 | } | |
1987 | ||
1988 | if (chan_ust_created) { | |
1989 | struct ltt_ust_channel *uchan = | |
1990 | trace_ust_find_channel_by_name( | |
1991 | session->ust_session->domain_global.channels, | |
1992 | DEFAULT_CHANNEL_NAME); | |
1993 | /* Created previously, this should NOT fail. */ | |
a0377dfe | 1994 | LTTNG_ASSERT(uchan); |
d5979e4a DG |
1995 | /* Remove from the channel list of the session. */ |
1996 | trace_ust_delete_channel(session->ust_session->domain_global.channels, | |
1997 | uchan); | |
1998 | trace_ust_destroy_channel(uchan); | |
1999 | } | |
bdf64013 | 2000 | end: |
2f77fc4b DG |
2001 | return ret; |
2002 | } | |
2003 | ||
dac8e046 JG |
2004 | static inline bool name_starts_with(const char *name, const char *prefix) |
2005 | { | |
7966af57 | 2006 | const size_t max_cmp_len = std::min(strlen(prefix), (size_t) LTTNG_SYMBOL_NAME_LEN); |
dac8e046 JG |
2007 | |
2008 | return !strncmp(name, prefix, max_cmp_len); | |
2009 | } | |
2010 | ||
2011 | /* Perform userspace-specific event name validation */ | |
2012 | static int validate_ust_event_name(const char *name) | |
2013 | { | |
2014 | int ret = 0; | |
2015 | ||
2016 | if (!name) { | |
2017 | ret = -1; | |
2018 | goto end; | |
2019 | } | |
2020 | ||
2021 | /* | |
2022 | * Check name against all internal UST event component namespaces used | |
2023 | * by the agents. | |
2024 | */ | |
2025 | if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) || | |
2026 | name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) || | |
2027 | name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) { | |
2028 | ret = -1; | |
2029 | } | |
2030 | ||
2031 | end: | |
2032 | return ret; | |
2033 | } | |
88f06f15 | 2034 | |
2f77fc4b | 2035 | /* |
88f06f15 JG |
2036 | * Internal version of cmd_enable_event() with a supplemental |
2037 | * "internal_event" flag which is used to enable internal events which should | |
2038 | * be hidden from clients. Such events are used in the agent implementation to | |
2039 | * enable the events through which all "agent" events are funeled. | |
2f77fc4b | 2040 | */ |
88f06f15 | 2041 | static int _cmd_enable_event(struct ltt_session *session, |
df4f5a87 | 2042 | const struct lttng_domain *domain, |
025faf73 | 2043 | char *channel_name, struct lttng_event *event, |
6b453b5e | 2044 | char *filter_expression, |
2b00d462 | 2045 | struct lttng_bytecode *filter, |
db8f1377 | 2046 | struct lttng_event_exclusion *exclusion, |
88f06f15 | 2047 | int wpipe, bool internal_event) |
2f77fc4b | 2048 | { |
9f449915 | 2049 | int ret = 0, channel_created = 0; |
cfedea03 | 2050 | struct lttng_channel *attr = NULL; |
2f77fc4b | 2051 | |
a0377dfe FD |
2052 | LTTNG_ASSERT(session); |
2053 | LTTNG_ASSERT(event); | |
2054 | LTTNG_ASSERT(channel_name); | |
2f77fc4b | 2055 | |
2a385866 | 2056 | /* If we have a filter, we must have its filter expression */ |
a0377dfe | 2057 | LTTNG_ASSERT(!(!!filter_expression ^ !!filter)); |
2a385866 | 2058 | |
9f449915 PP |
2059 | /* Normalize event name as a globbing pattern */ |
2060 | strutils_normalize_star_glob_pattern(event->name); | |
18a720cd | 2061 | |
9f449915 PP |
2062 | /* Normalize exclusion names as globbing patterns */ |
2063 | if (exclusion) { | |
2064 | size_t i; | |
f5ac4bd7 | 2065 | |
9f449915 PP |
2066 | for (i = 0; i < exclusion->count; i++) { |
2067 | char *name = LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i); | |
2068 | ||
2069 | strutils_normalize_star_glob_pattern(name); | |
2070 | } | |
930a2e99 JG |
2071 | } |
2072 | ||
9f449915 PP |
2073 | DBG("Enable event command for event \'%s\'", event->name); |
2074 | ||
2075 | rcu_read_lock(); | |
2076 | ||
7972aab2 | 2077 | switch (domain->type) { |
2f77fc4b DG |
2078 | case LTTNG_DOMAIN_KERNEL: |
2079 | { | |
2080 | struct ltt_kernel_channel *kchan; | |
2081 | ||
85076754 MD |
2082 | /* |
2083 | * If a non-default channel has been created in the | |
2084 | * session, explicitely require that -c chan_name needs | |
2085 | * to be provided. | |
2086 | */ | |
2087 | if (session->kernel_session->has_non_default_channel | |
2088 | && channel_name[0] == '\0') { | |
2089 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
2090 | goto error; | |
2091 | } | |
2092 | ||
2f77fc4b DG |
2093 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2094 | session->kernel_session); | |
2095 | if (kchan == NULL) { | |
0a9c6494 DG |
2096 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
2097 | LTTNG_BUFFER_GLOBAL); | |
2f77fc4b | 2098 | if (attr == NULL) { |
f73fabfd | 2099 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2100 | goto error; |
2101 | } | |
04c17253 MD |
2102 | if (lttng_strncpy(attr->name, channel_name, |
2103 | sizeof(attr->name))) { | |
2104 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
2105 | goto error; |
2106 | } | |
2f77fc4b | 2107 | |
999af9c1 JR |
2108 | ret = cmd_enable_channel_internal( |
2109 | session, domain, attr, wpipe); | |
f73fabfd | 2110 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2111 | goto error; |
2112 | } | |
e5f5db7f | 2113 | channel_created = 1; |
2f77fc4b DG |
2114 | } |
2115 | ||
2116 | /* Get the newly created kernel channel pointer */ | |
2117 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2118 | session->kernel_session); | |
2119 | if (kchan == NULL) { | |
2120 | /* This sould not happen... */ | |
f73fabfd | 2121 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2122 | goto error; |
2123 | } | |
2124 | ||
6e911cad MD |
2125 | switch (event->type) { |
2126 | case LTTNG_EVENT_ALL: | |
29c62722 | 2127 | { |
00a62084 | 2128 | char *filter_expression_a = NULL; |
2b00d462 | 2129 | struct lttng_bytecode *filter_a = NULL; |
00a62084 MD |
2130 | |
2131 | /* | |
2132 | * We need to duplicate filter_expression and filter, | |
2133 | * because ownership is passed to first enable | |
2134 | * event. | |
2135 | */ | |
2136 | if (filter_expression) { | |
2137 | filter_expression_a = strdup(filter_expression); | |
2138 | if (!filter_expression_a) { | |
2139 | ret = LTTNG_ERR_FATAL; | |
2140 | goto error; | |
2141 | } | |
2142 | } | |
2143 | if (filter) { | |
64803277 | 2144 | filter_a = zmalloc<lttng_bytecode>(sizeof(*filter_a) + filter->len); |
00a62084 MD |
2145 | if (!filter_a) { |
2146 | free(filter_expression_a); | |
2147 | ret = LTTNG_ERR_FATAL; | |
2148 | goto error; | |
2149 | } | |
2150 | memcpy(filter_a, filter, sizeof(*filter_a) + filter->len); | |
2151 | } | |
29c62722 | 2152 | event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */ |
00a62084 MD |
2153 | ret = event_kernel_enable_event(kchan, event, |
2154 | filter_expression, filter); | |
a969e101 MD |
2155 | /* We have passed ownership */ |
2156 | filter_expression = NULL; | |
2157 | filter = NULL; | |
29c62722 MD |
2158 | if (ret != LTTNG_OK) { |
2159 | if (channel_created) { | |
2160 | /* Let's not leak a useless channel. */ | |
2161 | kernel_destroy_channel(kchan); | |
2162 | } | |
00a62084 MD |
2163 | free(filter_expression_a); |
2164 | free(filter_a); | |
29c62722 MD |
2165 | goto error; |
2166 | } | |
2167 | event->type = LTTNG_EVENT_SYSCALL; /* Hack */ | |
00a62084 MD |
2168 | ret = event_kernel_enable_event(kchan, event, |
2169 | filter_expression_a, filter_a); | |
60d21fa2 AB |
2170 | /* We have passed ownership */ |
2171 | filter_expression_a = NULL; | |
2172 | filter_a = NULL; | |
29c62722 MD |
2173 | if (ret != LTTNG_OK) { |
2174 | goto error; | |
2175 | } | |
2176 | break; | |
2177 | } | |
6e6ef3d7 | 2178 | case LTTNG_EVENT_PROBE: |
dcabc190 | 2179 | case LTTNG_EVENT_USERSPACE_PROBE: |
6e6ef3d7 DG |
2180 | case LTTNG_EVENT_FUNCTION: |
2181 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
6e911cad | 2182 | case LTTNG_EVENT_TRACEPOINT: |
00a62084 MD |
2183 | ret = event_kernel_enable_event(kchan, event, |
2184 | filter_expression, filter); | |
a969e101 MD |
2185 | /* We have passed ownership */ |
2186 | filter_expression = NULL; | |
2187 | filter = NULL; | |
6e911cad MD |
2188 | if (ret != LTTNG_OK) { |
2189 | if (channel_created) { | |
2190 | /* Let's not leak a useless channel. */ | |
2191 | kernel_destroy_channel(kchan); | |
2192 | } | |
2193 | goto error; | |
e5f5db7f | 2194 | } |
6e911cad MD |
2195 | break; |
2196 | case LTTNG_EVENT_SYSCALL: | |
00a62084 MD |
2197 | ret = event_kernel_enable_event(kchan, event, |
2198 | filter_expression, filter); | |
a969e101 MD |
2199 | /* We have passed ownership */ |
2200 | filter_expression = NULL; | |
2201 | filter = NULL; | |
e2b957af MD |
2202 | if (ret != LTTNG_OK) { |
2203 | goto error; | |
2204 | } | |
6e911cad MD |
2205 | break; |
2206 | default: | |
2207 | ret = LTTNG_ERR_UNK; | |
2f77fc4b DG |
2208 | goto error; |
2209 | } | |
2210 | ||
7d268848 | 2211 | kernel_wait_quiescent(); |
2f77fc4b DG |
2212 | break; |
2213 | } | |
2214 | case LTTNG_DOMAIN_UST: | |
2215 | { | |
2216 | struct ltt_ust_channel *uchan; | |
2217 | struct ltt_ust_session *usess = session->ust_session; | |
2218 | ||
a0377dfe | 2219 | LTTNG_ASSERT(usess); |
2f77fc4b | 2220 | |
85076754 MD |
2221 | /* |
2222 | * If a non-default channel has been created in the | |
2223 | * session, explicitely require that -c chan_name needs | |
2224 | * to be provided. | |
2225 | */ | |
2226 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
2227 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
2228 | goto error; | |
2229 | } | |
2230 | ||
2f77fc4b DG |
2231 | /* Get channel from global UST domain */ |
2232 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2233 | channel_name); | |
2234 | if (uchan == NULL) { | |
2235 | /* Create default channel */ | |
0a9c6494 DG |
2236 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
2237 | usess->buffer_type); | |
2f77fc4b | 2238 | if (attr == NULL) { |
f73fabfd | 2239 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2240 | goto error; |
2241 | } | |
04c17253 MD |
2242 | if (lttng_strncpy(attr->name, channel_name, |
2243 | sizeof(attr->name))) { | |
2244 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
2245 | goto error; |
2246 | } | |
2f77fc4b | 2247 | |
999af9c1 JR |
2248 | ret = cmd_enable_channel_internal( |
2249 | session, domain, attr, wpipe); | |
f73fabfd | 2250 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2251 | goto error; |
2252 | } | |
2f77fc4b DG |
2253 | |
2254 | /* Get the newly created channel reference back */ | |
2255 | uchan = trace_ust_find_channel_by_name( | |
2256 | usess->domain_global.channels, channel_name); | |
a0377dfe | 2257 | LTTNG_ASSERT(uchan); |
2f77fc4b DG |
2258 | } |
2259 | ||
141feb8c JG |
2260 | if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) { |
2261 | /* | |
2262 | * Don't allow users to add UST events to channels which | |
2263 | * are assigned to a userspace subdomain (JUL, Log4J, | |
2264 | * Python, etc.). | |
2265 | */ | |
2266 | ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN; | |
2267 | goto error; | |
2268 | } | |
2269 | ||
dac8e046 JG |
2270 | if (!internal_event) { |
2271 | /* | |
2272 | * Ensure the event name is not reserved for internal | |
2273 | * use. | |
2274 | */ | |
2275 | ret = validate_ust_event_name(event->name); | |
2276 | if (ret) { | |
0e270a1e | 2277 | WARN("Userspace event name %s failed validation.", |
bbcab087 | 2278 | event->name); |
dac8e046 JG |
2279 | ret = LTTNG_ERR_INVALID_EVENT_NAME; |
2280 | goto error; | |
2281 | } | |
2282 | } | |
2283 | ||
2f77fc4b | 2284 | /* At this point, the session and channel exist on the tracer */ |
6b453b5e | 2285 | ret = event_ust_enable_tracepoint(usess, uchan, event, |
88f06f15 JG |
2286 | filter_expression, filter, exclusion, |
2287 | internal_event); | |
49d21f93 MD |
2288 | /* We have passed ownership */ |
2289 | filter_expression = NULL; | |
2290 | filter = NULL; | |
2291 | exclusion = NULL; | |
94382e15 JG |
2292 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2293 | goto already_enabled; | |
2294 | } else if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2295 | goto error; |
2296 | } | |
2297 | break; | |
2298 | } | |
5cdb6027 | 2299 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 2300 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2301 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 2302 | { |
da6c3a50 | 2303 | const char *default_event_name, *default_chan_name; |
fefd409b | 2304 | struct agent *agt; |
f20baf8e DG |
2305 | struct lttng_event uevent; |
2306 | struct lttng_domain tmp_dom; | |
2307 | struct ltt_ust_session *usess = session->ust_session; | |
2308 | ||
a0377dfe | 2309 | LTTNG_ASSERT(usess); |
f20baf8e | 2310 | |
f28f9e44 JG |
2311 | if (!agent_tracing_is_enabled()) { |
2312 | DBG("Attempted to enable an event in an agent domain but the agent thread is not running"); | |
2313 | ret = LTTNG_ERR_AGENT_TRACING_DISABLED; | |
2314 | goto error; | |
2315 | } | |
2316 | ||
5cdb6027 | 2317 | agt = trace_ust_find_agent(usess, domain->type); |
fefd409b | 2318 | if (!agt) { |
5cdb6027 | 2319 | agt = agent_create(domain->type); |
fefd409b | 2320 | if (!agt) { |
e5b3c48c | 2321 | ret = LTTNG_ERR_NOMEM; |
fefd409b DG |
2322 | goto error; |
2323 | } | |
2324 | agent_add(agt, usess->agents); | |
2325 | } | |
2326 | ||
022d91ba | 2327 | /* Create the default tracepoint. */ |
996de3c7 | 2328 | memset(&uevent, 0, sizeof(uevent)); |
f20baf8e DG |
2329 | uevent.type = LTTNG_EVENT_TRACEPOINT; |
2330 | uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
51755dc8 JG |
2331 | default_event_name = event_get_default_agent_ust_name( |
2332 | domain->type); | |
da6c3a50 | 2333 | if (!default_event_name) { |
e5b3c48c | 2334 | ret = LTTNG_ERR_FATAL; |
da6c3a50 | 2335 | goto error; |
f43f95a9 | 2336 | } |
da6c3a50 | 2337 | strncpy(uevent.name, default_event_name, sizeof(uevent.name)); |
f20baf8e DG |
2338 | uevent.name[sizeof(uevent.name) - 1] = '\0'; |
2339 | ||
2340 | /* | |
2341 | * The domain type is changed because we are about to enable the | |
2342 | * default channel and event for the JUL domain that are hardcoded. | |
2343 | * This happens in the UST domain. | |
2344 | */ | |
2345 | memcpy(&tmp_dom, domain, sizeof(tmp_dom)); | |
2346 | tmp_dom.type = LTTNG_DOMAIN_UST; | |
2347 | ||
0e115563 DG |
2348 | switch (domain->type) { |
2349 | case LTTNG_DOMAIN_LOG4J: | |
da6c3a50 | 2350 | default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME; |
0e115563 DG |
2351 | break; |
2352 | case LTTNG_DOMAIN_JUL: | |
da6c3a50 | 2353 | default_chan_name = DEFAULT_JUL_CHANNEL_NAME; |
0e115563 DG |
2354 | break; |
2355 | case LTTNG_DOMAIN_PYTHON: | |
2356 | default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
2357 | break; | |
2358 | default: | |
e98a44b0 | 2359 | /* The switch/case we are in makes this impossible */ |
a0377dfe | 2360 | abort(); |
da6c3a50 DG |
2361 | } |
2362 | ||
971da06a | 2363 | { |
8404118c | 2364 | char *filter_expression_copy = NULL; |
2b00d462 | 2365 | struct lttng_bytecode *filter_copy = NULL; |
971da06a JG |
2366 | |
2367 | if (filter) { | |
51755dc8 | 2368 | const size_t filter_size = sizeof( |
2b00d462 | 2369 | struct lttng_bytecode) |
51755dc8 JG |
2370 | + filter->len; |
2371 | ||
64803277 | 2372 | filter_copy = zmalloc<lttng_bytecode>(filter_size); |
971da06a | 2373 | if (!filter_copy) { |
018096a4 | 2374 | ret = LTTNG_ERR_NOMEM; |
b742e3e2 | 2375 | goto error; |
971da06a | 2376 | } |
51755dc8 | 2377 | memcpy(filter_copy, filter, filter_size); |
971da06a | 2378 | |
8404118c JG |
2379 | filter_expression_copy = |
2380 | strdup(filter_expression); | |
2381 | if (!filter_expression) { | |
2382 | ret = LTTNG_ERR_NOMEM; | |
51755dc8 JG |
2383 | } |
2384 | ||
2385 | if (!filter_expression_copy || !filter_copy) { | |
2386 | free(filter_expression_copy); | |
2387 | free(filter_copy); | |
2388 | goto error; | |
8404118c | 2389 | } |
971da06a JG |
2390 | } |
2391 | ||
88f06f15 | 2392 | ret = cmd_enable_event_internal(session, &tmp_dom, |
971da06a | 2393 | (char *) default_chan_name, |
8404118c JG |
2394 | &uevent, filter_expression_copy, |
2395 | filter_copy, NULL, wpipe); | |
971da06a JG |
2396 | } |
2397 | ||
94382e15 JG |
2398 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2399 | goto already_enabled; | |
2400 | } else if (ret != LTTNG_OK) { | |
f20baf8e DG |
2401 | goto error; |
2402 | } | |
2403 | ||
2404 | /* The wild card * means that everything should be enabled. */ | |
2405 | if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) { | |
8404118c JG |
2406 | ret = event_agent_enable_all(usess, agt, event, filter, |
2407 | filter_expression); | |
f20baf8e | 2408 | } else { |
8404118c JG |
2409 | ret = event_agent_enable(usess, agt, event, filter, |
2410 | filter_expression); | |
f20baf8e | 2411 | } |
51755dc8 JG |
2412 | filter = NULL; |
2413 | filter_expression = NULL; | |
f20baf8e DG |
2414 | if (ret != LTTNG_OK) { |
2415 | goto error; | |
2416 | } | |
2417 | ||
2418 | break; | |
2419 | } | |
2f77fc4b | 2420 | default: |
f73fabfd | 2421 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2422 | goto error; |
2423 | } | |
2424 | ||
f73fabfd | 2425 | ret = LTTNG_OK; |
2f77fc4b | 2426 | |
94382e15 | 2427 | already_enabled: |
2f77fc4b | 2428 | error: |
49d21f93 MD |
2429 | free(filter_expression); |
2430 | free(filter); | |
2431 | free(exclusion); | |
cf0bcb51 | 2432 | channel_attr_destroy(attr); |
2223c96f | 2433 | rcu_read_unlock(); |
2f77fc4b DG |
2434 | return ret; |
2435 | } | |
2436 | ||
88f06f15 JG |
2437 | /* |
2438 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2439 | * We own filter, exclusion, and filter_expression. | |
2440 | */ | |
8ddd72ef JR |
2441 | int cmd_enable_event(struct command_ctx *cmd_ctx, |
2442 | struct lttng_event *event, | |
88f06f15 | 2443 | char *filter_expression, |
88f06f15 | 2444 | struct lttng_event_exclusion *exclusion, |
8ddd72ef | 2445 | struct lttng_bytecode *bytecode, |
88f06f15 JG |
2446 | int wpipe) |
2447 | { | |
8ddd72ef JR |
2448 | int ret; |
2449 | /* | |
2450 | * Copied to ensure proper alignment since 'lsm' is a packed structure. | |
2451 | */ | |
2452 | const lttng_domain command_domain = cmd_ctx->lsm.domain; | |
2453 | ||
2454 | /* | |
2455 | * The ownership of the following parameters is transferred to | |
2456 | * _cmd_enable_event: | |
2457 | * | |
2458 | * - filter_expression, | |
2459 | * - bytecode, | |
2460 | * - exclusion | |
2461 | */ | |
2462 | ret = _cmd_enable_event(cmd_ctx->session, | |
2463 | &command_domain, | |
2464 | cmd_ctx->lsm.u.enable.channel_name, event, | |
2465 | filter_expression, bytecode, exclusion, wpipe, false); | |
2466 | filter_expression = NULL; | |
2467 | bytecode = NULL; | |
2468 | exclusion = NULL; | |
2469 | return ret; | |
88f06f15 JG |
2470 | } |
2471 | ||
2472 | /* | |
2473 | * Enable an event which is internal to LTTng. An internal should | |
2474 | * never be made visible to clients and are immune to checks such as | |
2475 | * reserved names. | |
2476 | */ | |
2477 | static int cmd_enable_event_internal(struct ltt_session *session, | |
df4f5a87 | 2478 | const struct lttng_domain *domain, |
88f06f15 JG |
2479 | char *channel_name, struct lttng_event *event, |
2480 | char *filter_expression, | |
2b00d462 | 2481 | struct lttng_bytecode *filter, |
88f06f15 JG |
2482 | struct lttng_event_exclusion *exclusion, |
2483 | int wpipe) | |
2484 | { | |
2485 | return _cmd_enable_event(session, domain, channel_name, event, | |
2486 | filter_expression, filter, exclusion, wpipe, true); | |
2487 | } | |
2488 | ||
2f77fc4b DG |
2489 | /* |
2490 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2491 | */ | |
8ddd72ef JR |
2492 | enum lttng_error_code cmd_list_tracepoints(enum lttng_domain_type domain, |
2493 | struct lttng_payload *reply_payload) | |
2f77fc4b | 2494 | { |
8ddd72ef | 2495 | enum lttng_error_code ret_code; |
2f77fc4b | 2496 | int ret; |
8ddd72ef JR |
2497 | ssize_t i, nb_events = 0; |
2498 | struct lttng_event *events = NULL; | |
2499 | struct lttcomm_list_command_header reply_command_header = {}; | |
2500 | size_t reply_command_header_offset; | |
2501 | ||
2502 | assert(reply_payload); | |
2503 | ||
2504 | /* Reserve space for command reply header. */ | |
2505 | reply_command_header_offset = reply_payload->buffer.size; | |
2506 | ret = lttng_dynamic_buffer_set_size(&reply_payload->buffer, | |
2507 | reply_command_header_offset + | |
2508 | sizeof(struct lttcomm_list_command_header)); | |
2509 | if (ret) { | |
2510 | ret_code = LTTNG_ERR_NOMEM; | |
2511 | goto error; | |
2512 | } | |
2f77fc4b DG |
2513 | |
2514 | switch (domain) { | |
2515 | case LTTNG_DOMAIN_KERNEL: | |
8ddd72ef | 2516 | nb_events = kernel_list_events(&events); |
2f77fc4b | 2517 | if (nb_events < 0) { |
8ddd72ef | 2518 | ret_code = LTTNG_ERR_KERN_LIST_FAIL; |
2f77fc4b DG |
2519 | goto error; |
2520 | } | |
2521 | break; | |
2522 | case LTTNG_DOMAIN_UST: | |
8ddd72ef | 2523 | nb_events = ust_app_list_events(&events); |
2f77fc4b | 2524 | if (nb_events < 0) { |
8ddd72ef | 2525 | ret_code = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2526 | goto error; |
2527 | } | |
2528 | break; | |
5cdb6027 | 2529 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2530 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2531 | case LTTNG_DOMAIN_PYTHON: |
8ddd72ef | 2532 | nb_events = agent_list_events(&events, domain); |
3c6a091f | 2533 | if (nb_events < 0) { |
8ddd72ef | 2534 | ret_code = LTTNG_ERR_UST_LIST_FAIL; |
3c6a091f DG |
2535 | goto error; |
2536 | } | |
2537 | break; | |
2f77fc4b | 2538 | default: |
8ddd72ef JR |
2539 | ret_code = LTTNG_ERR_UND; |
2540 | goto error; | |
2541 | } | |
2542 | ||
2543 | for (i = 0; i < nb_events; i++) { | |
2544 | ret = lttng_event_serialize(&events[i], 0, NULL, NULL, 0, NULL, | |
2545 | reply_payload); | |
2546 | if (ret) { | |
2547 | ret_code = LTTNG_ERR_NOMEM; | |
2548 | goto error; | |
2549 | } | |
2550 | } | |
2551 | ||
2552 | if (nb_events > UINT32_MAX) { | |
2553 | ERR("Tracepoint count would overflow the tracepoint listing command's reply"); | |
2554 | ret_code = LTTNG_ERR_OVERFLOW; | |
2f77fc4b DG |
2555 | goto error; |
2556 | } | |
2557 | ||
8ddd72ef JR |
2558 | /* Update command reply header. */ |
2559 | reply_command_header.count = (uint32_t) nb_events; | |
2560 | memcpy(reply_payload->buffer.data + reply_command_header_offset, &reply_command_header, | |
2561 | sizeof(reply_command_header)); | |
2f77fc4b | 2562 | |
8ddd72ef | 2563 | ret_code = LTTNG_OK; |
2f77fc4b | 2564 | error: |
8ddd72ef JR |
2565 | free(events); |
2566 | return ret_code; | |
2f77fc4b DG |
2567 | } |
2568 | ||
2569 | /* | |
2570 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
2571 | */ | |
b2d68839 JR |
2572 | enum lttng_error_code cmd_list_tracepoint_fields(enum lttng_domain_type domain, |
2573 | struct lttng_payload *reply) | |
2f77fc4b | 2574 | { |
b2d68839 | 2575 | enum lttng_error_code ret_code; |
2f77fc4b | 2576 | int ret; |
b2d68839 JR |
2577 | unsigned int i, nb_fields; |
2578 | struct lttng_event_field *fields = NULL; | |
2579 | struct lttcomm_list_command_header reply_command_header = {}; | |
2580 | size_t reply_command_header_offset; | |
2581 | ||
2582 | assert(reply); | |
2583 | ||
2584 | /* Reserve space for command reply header. */ | |
2585 | reply_command_header_offset = reply->buffer.size; | |
2586 | ret = lttng_dynamic_buffer_set_size(&reply->buffer, | |
2587 | reply_command_header_offset + | |
2588 | sizeof(struct lttcomm_list_command_header)); | |
2589 | if (ret) { | |
2590 | ret_code = LTTNG_ERR_NOMEM; | |
2591 | goto error; | |
2592 | } | |
2f77fc4b DG |
2593 | |
2594 | switch (domain) { | |
2595 | case LTTNG_DOMAIN_UST: | |
b2d68839 JR |
2596 | ret = ust_app_list_event_fields(&fields); |
2597 | if (ret < 0) { | |
2598 | ret_code = LTTNG_ERR_UST_LIST_FAIL; | |
2f77fc4b DG |
2599 | goto error; |
2600 | } | |
b2d68839 | 2601 | |
2f77fc4b DG |
2602 | break; |
2603 | case LTTNG_DOMAIN_KERNEL: | |
2604 | default: /* fall-through */ | |
b2d68839 | 2605 | ret_code = LTTNG_ERR_UND; |
2f77fc4b DG |
2606 | goto error; |
2607 | } | |
2608 | ||
b2d68839 JR |
2609 | nb_fields = ret; |
2610 | ||
2611 | for (i = 0; i < nb_fields; i++) { | |
2612 | ret = lttng_event_field_serialize(&fields[i], reply); | |
2613 | if (ret) { | |
2614 | ret_code = LTTNG_ERR_NOMEM; | |
2615 | goto error; | |
2616 | } | |
2617 | } | |
2618 | ||
2619 | if (nb_fields > UINT32_MAX) { | |
2620 | ERR("Tracepoint field count would overflow the tracepoint field listing command's reply"); | |
2621 | ret_code = LTTNG_ERR_OVERFLOW; | |
2622 | goto error; | |
2623 | } | |
2624 | ||
2625 | /* Update command reply header. */ | |
2626 | reply_command_header.count = (uint32_t) nb_fields; | |
2627 | ||
2628 | memcpy(reply->buffer.data + reply_command_header_offset, &reply_command_header, | |
2629 | sizeof(reply_command_header)); | |
2630 | ||
2631 | ret_code = LTTNG_OK; | |
2f77fc4b DG |
2632 | |
2633 | error: | |
b2d68839 JR |
2634 | free(fields); |
2635 | return ret_code; | |
2f77fc4b DG |
2636 | } |
2637 | ||
8ddd72ef JR |
2638 | enum lttng_error_code cmd_list_syscalls( |
2639 | struct lttng_payload *reply_payload) | |
834978fd | 2640 | { |
8ddd72ef JR |
2641 | enum lttng_error_code ret_code; |
2642 | ssize_t nb_events, i; | |
2643 | int ret; | |
2644 | struct lttng_event *events = NULL; | |
2645 | struct lttcomm_list_command_header reply_command_header = {}; | |
2646 | size_t reply_command_header_offset; | |
2647 | ||
2648 | assert(reply_payload); | |
2649 | ||
2650 | /* Reserve space for command reply header. */ | |
2651 | reply_command_header_offset = reply_payload->buffer.size; | |
2652 | ret = lttng_dynamic_buffer_set_size(&reply_payload->buffer, | |
2653 | reply_command_header_offset + | |
2654 | sizeof(struct lttcomm_list_command_header)); | |
2655 | if (ret) { | |
2656 | ret_code = LTTNG_ERR_NOMEM; | |
2657 | goto end; | |
2658 | } | |
2659 | ||
2660 | nb_events = syscall_table_list(&events); | |
2661 | if (nb_events < 0) { | |
2662 | ret_code = (enum lttng_error_code) -nb_events; | |
2663 | goto end; | |
2664 | } | |
2665 | ||
2666 | for (i = 0; i < nb_events; i++) { | |
2667 | ret = lttng_event_serialize(&events[i], 0, NULL, NULL, 0, NULL, | |
2668 | reply_payload); | |
2669 | if (ret) { | |
2670 | ret_code = LTTNG_ERR_NOMEM; | |
2671 | goto end; | |
2672 | } | |
2673 | } | |
2674 | ||
2675 | if (nb_events > UINT32_MAX) { | |
2676 | ERR("Syscall count would overflow the syscall listing command's reply"); | |
2677 | ret_code = LTTNG_ERR_OVERFLOW; | |
2678 | goto end; | |
2679 | } | |
2680 | ||
2681 | /* Update command reply header. */ | |
2682 | reply_command_header.count = (uint32_t) nb_events; | |
2683 | memcpy(reply_payload->buffer.data + reply_command_header_offset, &reply_command_header, | |
2684 | sizeof(reply_command_header)); | |
2685 | ||
2686 | ret_code = LTTNG_OK; | |
2687 | end: | |
2688 | free(events); | |
2689 | return ret_code; | |
834978fd DG |
2690 | } |
2691 | ||
2f77fc4b DG |
2692 | /* |
2693 | * Command LTTNG_START_TRACE processed by the client thread. | |
a9ad0c8f MD |
2694 | * |
2695 | * Called with session mutex held. | |
2f77fc4b DG |
2696 | */ |
2697 | int cmd_start_trace(struct ltt_session *session) | |
2698 | { | |
82b69413 | 2699 | enum lttng_error_code ret; |
cde3e505 | 2700 | unsigned long nb_chan = 0; |
2f77fc4b DG |
2701 | struct ltt_kernel_session *ksession; |
2702 | struct ltt_ust_session *usess; | |
1f496244 JG |
2703 | const bool session_rotated_after_last_stop = |
2704 | session->rotated_after_last_stop; | |
b02f5986 MD |
2705 | const bool session_cleared_after_last_stop = |
2706 | session->cleared_after_last_stop; | |
2f77fc4b | 2707 | |
a0377dfe | 2708 | LTTNG_ASSERT(session); |
2f77fc4b DG |
2709 | |
2710 | /* Ease our life a bit ;) */ | |
2711 | ksession = session->kernel_session; | |
2712 | usess = session->ust_session; | |
2713 | ||
8382cf6f DG |
2714 | /* Is the session already started? */ |
2715 | if (session->active) { | |
f73fabfd | 2716 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
7a24ece3 JR |
2717 | /* Perform nothing */ |
2718 | goto end; | |
2f77fc4b DG |
2719 | } |
2720 | ||
1f496244 JG |
2721 | if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING && |
2722 | !session->current_trace_chunk) { | |
2723 | /* | |
2724 | * A rotation was launched while the session was stopped and | |
2725 | * it has not been completed yet. It is not possible to start | |
2726 | * the session since starting the session here would require a | |
2727 | * rotation from "NULL" to a new trace chunk. That rotation | |
2728 | * would overlap with the ongoing rotation, which is not | |
2729 | * supported. | |
2730 | */ | |
2731 | WARN("Refusing to start session \"%s\" as a rotation launched after the last \"stop\" is still ongoing", | |
2732 | session->name); | |
2733 | ret = LTTNG_ERR_ROTATION_PENDING; | |
2734 | goto error; | |
2735 | } | |
2736 | ||
cde3e505 DG |
2737 | /* |
2738 | * Starting a session without channel is useless since after that it's not | |
2739 | * possible to enable channel thus inform the client. | |
2740 | */ | |
2741 | if (usess && usess->domain_global.channels) { | |
2742 | nb_chan += lttng_ht_get_count(usess->domain_global.channels); | |
2743 | } | |
2744 | if (ksession) { | |
2745 | nb_chan += ksession->channel_count; | |
2746 | } | |
2747 | if (!nb_chan) { | |
2748 | ret = LTTNG_ERR_NO_CHANNEL; | |
2749 | goto error; | |
2750 | } | |
2751 | ||
1f496244 JG |
2752 | session->active = 1; |
2753 | session->rotated_after_last_stop = false; | |
b02f5986 | 2754 | session->cleared_after_last_stop = false; |
070b6a86 | 2755 | if (session->output_traces && !session->current_trace_chunk) { |
1f496244 JG |
2756 | if (!session->has_been_started) { |
2757 | struct lttng_trace_chunk *trace_chunk; | |
2758 | ||
2759 | DBG("Creating initial trace chunk of session \"%s\"", | |
2760 | session->name); | |
2761 | trace_chunk = session_create_new_trace_chunk( | |
2762 | session, NULL, NULL, NULL); | |
2763 | if (!trace_chunk) { | |
2764 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
2765 | goto error; | |
2766 | } | |
a0377dfe | 2767 | LTTNG_ASSERT(!session->current_trace_chunk); |
7966af57 | 2768 | ret = (lttng_error_code) session_set_trace_chunk(session, trace_chunk, |
1f496244 JG |
2769 | NULL); |
2770 | lttng_trace_chunk_put(trace_chunk); | |
2771 | if (ret) { | |
2772 | ret = LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER; | |
2773 | goto error; | |
2774 | } | |
2775 | } else { | |
2776 | DBG("Rotating session \"%s\" from its current \"NULL\" trace chunk to a new chunk", | |
2777 | session->name); | |
2778 | /* | |
2779 | * Rotate existing streams into the new chunk. | |
2780 | * This is a "quiet" rotation has no client has | |
2781 | * explicitly requested this operation. | |
2782 | * | |
2783 | * There is also no need to wait for the rotation | |
2784 | * to complete as it will happen immediately. No data | |
2785 | * was produced as the session was stopped, so the | |
2786 | * rotation should happen on reception of the command. | |
2787 | */ | |
7966af57 | 2788 | ret = (lttng_error_code) cmd_rotate_session(session, NULL, true, |
343defc2 | 2789 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION); |
1f496244 JG |
2790 | if (ret != LTTNG_OK) { |
2791 | goto error; | |
2792 | } | |
5c408ad8 | 2793 | } |
c996624c JD |
2794 | } |
2795 | ||
2f77fc4b DG |
2796 | /* Kernel tracing */ |
2797 | if (ksession != NULL) { | |
c996624c | 2798 | DBG("Start kernel tracing session %s", session->name); |
7966af57 | 2799 | ret = (lttng_error_code) start_kernel_session(ksession); |
9b6c7ec5 | 2800 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2801 | goto error; |
2802 | } | |
2f77fc4b DG |
2803 | } |
2804 | ||
2805 | /* Flag session that trace should start automatically */ | |
2806 | if (usess) { | |
82b69413 JG |
2807 | int int_ret = ust_app_start_trace_all(usess); |
2808 | ||
2809 | if (int_ret < 0) { | |
f73fabfd | 2810 | ret = LTTNG_ERR_UST_START_FAIL; |
2f77fc4b DG |
2811 | goto error; |
2812 | } | |
2813 | } | |
2814 | ||
04ed9e10 JG |
2815 | /* |
2816 | * Open a packet in every stream of the session to ensure that viewers | |
2817 | * can correctly identify the boundaries of the periods during which | |
2818 | * tracing was active for this session. | |
2819 | */ | |
2820 | ret = session_open_packets(session); | |
2821 | if (ret != LTTNG_OK) { | |
2822 | goto error; | |
2823 | } | |
2824 | ||
5c408ad8 JD |
2825 | /* |
2826 | * Clear the flag that indicates that a rotation was done while the | |
2827 | * session was stopped. | |
2828 | */ | |
2829 | session->rotated_after_last_stop = false; | |
2830 | ||
355cf1bd | 2831 | if (session->rotate_timer_period && !session->rotation_schedule_timer_enabled) { |
82b69413 JG |
2832 | int int_ret = timer_session_rotation_schedule_timer_start( |
2833 | session, session->rotate_timer_period); | |
2834 | ||
2835 | if (int_ret < 0) { | |
259c2674 JD |
2836 | ERR("Failed to enable rotate timer"); |
2837 | ret = LTTNG_ERR_UNK; | |
2838 | goto error; | |
2839 | } | |
2840 | } | |
2841 | ||
f73fabfd | 2842 | ret = LTTNG_OK; |
2f77fc4b DG |
2843 | |
2844 | error: | |
1f496244 JG |
2845 | if (ret == LTTNG_OK) { |
2846 | /* Flag this after a successful start. */ | |
2847 | session->has_been_started |= 1; | |
2848 | } else { | |
2849 | session->active = 0; | |
2850 | /* Restore initial state on error. */ | |
2851 | session->rotated_after_last_stop = | |
2852 | session_rotated_after_last_stop; | |
b02f5986 MD |
2853 | session->cleared_after_last_stop = |
2854 | session_cleared_after_last_stop; | |
1f496244 | 2855 | } |
7a24ece3 | 2856 | end: |
2f77fc4b DG |
2857 | return ret; |
2858 | } | |
2859 | ||
2860 | /* | |
2861 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2862 | */ | |
2863 | int cmd_stop_trace(struct ltt_session *session) | |
2864 | { | |
2865 | int ret; | |
2f77fc4b DG |
2866 | struct ltt_kernel_session *ksession; |
2867 | struct ltt_ust_session *usess; | |
2868 | ||
a0377dfe | 2869 | LTTNG_ASSERT(session); |
2f77fc4b | 2870 | |
4dbe1875 | 2871 | DBG("Begin stop session \"%s\" (id %" PRIu64 ")", session->name, session->id); |
2f77fc4b DG |
2872 | /* Short cut */ |
2873 | ksession = session->kernel_session; | |
2874 | usess = session->ust_session; | |
2875 | ||
40afd77d | 2876 | /* Session is not active. Skip everything and inform the client. */ |
8382cf6f | 2877 | if (!session->active) { |
f73fabfd | 2878 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
2f77fc4b DG |
2879 | goto error; |
2880 | } | |
2881 | ||
4dbe1875 MD |
2882 | ret = stop_kernel_session(ksession); |
2883 | if (ret != LTTNG_OK) { | |
2884 | goto error; | |
2f77fc4b DG |
2885 | } |
2886 | ||
14fb1ebe | 2887 | if (usess && usess->active) { |
2f77fc4b DG |
2888 | ret = ust_app_stop_trace_all(usess); |
2889 | if (ret < 0) { | |
f73fabfd | 2890 | ret = LTTNG_ERR_UST_STOP_FAIL; |
2f77fc4b DG |
2891 | goto error; |
2892 | } | |
2893 | } | |
2894 | ||
4dbe1875 MD |
2895 | DBG("Completed stop session \"%s\" (id %" PRIu64 ")", session->name, |
2896 | session->id); | |
8382cf6f DG |
2897 | /* Flag inactive after a successful stop. */ |
2898 | session->active = 0; | |
4dbe1875 | 2899 | ret = LTTNG_OK; |
2f77fc4b DG |
2900 | |
2901 | error: | |
2902 | return ret; | |
2903 | } | |
2904 | ||
2905 | /* | |
433f5ba9 JR |
2906 | * Set the base_path of the session only if subdir of a control uris is set. |
2907 | * Return LTTNG_OK on success, otherwise LTTNG_ERR_*. | |
2f77fc4b | 2908 | */ |
433f5ba9 JR |
2909 | static int set_session_base_path_from_uris(struct ltt_session *session, |
2910 | size_t nb_uri, | |
bda32d56 | 2911 | struct lttng_uri *uris) |
2f77fc4b | 2912 | { |
433f5ba9 JR |
2913 | int ret; |
2914 | size_t i; | |
2f77fc4b | 2915 | |
e3876bf0 JR |
2916 | for (i = 0; i < nb_uri; i++) { |
2917 | if (uris[i].stype != LTTNG_STREAM_CONTROL || | |
2918 | uris[i].subdir[0] == '\0') { | |
2919 | /* Not interested in these URIs */ | |
2920 | continue; | |
2921 | } | |
2922 | ||
2923 | if (session->base_path != NULL) { | |
2924 | free(session->base_path); | |
2925 | session->base_path = NULL; | |
2926 | } | |
2927 | ||
2928 | /* Set session base_path */ | |
2929 | session->base_path = strdup(uris[i].subdir); | |
2930 | if (!session->base_path) { | |
433f5ba9 JR |
2931 | PERROR("Failed to copy base path \"%s\" to session \"%s\"", |
2932 | uris[i].subdir, session->name); | |
2933 | ret = LTTNG_ERR_NOMEM; | |
e3876bf0 JR |
2934 | goto error; |
2935 | } | |
433f5ba9 JR |
2936 | DBG2("Setting base path \"%s\" for session \"%s\"", |
2937 | session->base_path, session->name); | |
2938 | } | |
2939 | ret = LTTNG_OK; | |
2940 | error: | |
2941 | return ret; | |
2942 | } | |
2943 | ||
2944 | /* | |
2945 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
2946 | */ | |
2947 | int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri, | |
2948 | struct lttng_uri *uris) | |
2949 | { | |
2950 | int ret, i; | |
2951 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2952 | struct ltt_ust_session *usess = session->ust_session; | |
2953 | ||
a0377dfe FD |
2954 | LTTNG_ASSERT(session); |
2955 | LTTNG_ASSERT(uris); | |
2956 | LTTNG_ASSERT(nb_uri > 0); | |
433f5ba9 JR |
2957 | |
2958 | /* Can't set consumer URI if the session is active. */ | |
2959 | if (session->active) { | |
2960 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; | |
2961 | goto error; | |
2962 | } | |
2963 | ||
2964 | /* | |
2965 | * Set the session base path if any. This is done inside | |
2966 | * cmd_set_consumer_uri to preserve backward compatibility of the | |
2967 | * previous session creation api vs the session descriptor api. | |
2968 | */ | |
2969 | ret = set_session_base_path_from_uris(session, nb_uri, uris); | |
2970 | if (ret != LTTNG_OK) { | |
2971 | goto error; | |
e3876bf0 JR |
2972 | } |
2973 | ||
bda32d56 | 2974 | /* Set the "global" consumer URIs */ |
2f77fc4b | 2975 | for (i = 0; i < nb_uri; i++) { |
e3876bf0 JR |
2976 | ret = add_uri_to_consumer(session, session->consumer, &uris[i], |
2977 | LTTNG_DOMAIN_NONE); | |
a74934ba | 2978 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2979 | goto error; |
2980 | } | |
2f77fc4b DG |
2981 | } |
2982 | ||
bda32d56 JG |
2983 | /* Set UST session URIs */ |
2984 | if (session->ust_session) { | |
2985 | for (i = 0; i < nb_uri; i++) { | |
b178f53e | 2986 | ret = add_uri_to_consumer(session, |
bda32d56 | 2987 | session->ust_session->consumer, |
b178f53e | 2988 | &uris[i], LTTNG_DOMAIN_UST); |
bda32d56 JG |
2989 | if (ret != LTTNG_OK) { |
2990 | goto error; | |
2991 | } | |
2992 | } | |
2993 | } | |
2994 | ||
2995 | /* Set kernel session URIs */ | |
2996 | if (session->kernel_session) { | |
2997 | for (i = 0; i < nb_uri; i++) { | |
b178f53e | 2998 | ret = add_uri_to_consumer(session, |
bda32d56 | 2999 | session->kernel_session->consumer, |
b178f53e | 3000 | &uris[i], LTTNG_DOMAIN_KERNEL); |
bda32d56 JG |
3001 | if (ret != LTTNG_OK) { |
3002 | goto error; | |
3003 | } | |
3004 | } | |
3005 | } | |
3006 | ||
7ab70fe0 DG |
3007 | /* |
3008 | * Make sure to set the session in output mode after we set URI since a | |
3009 | * session can be created without URL (thus flagged in no output mode). | |
3010 | */ | |
3011 | session->output_traces = 1; | |
3012 | if (ksess) { | |
3013 | ksess->output_traces = 1; | |
bda32d56 JG |
3014 | } |
3015 | ||
3016 | if (usess) { | |
7ab70fe0 DG |
3017 | usess->output_traces = 1; |
3018 | } | |
3019 | ||
2f77fc4b | 3020 | /* All good! */ |
f73fabfd | 3021 | ret = LTTNG_OK; |
2f77fc4b DG |
3022 | |
3023 | error: | |
3024 | return ret; | |
3025 | } | |
3026 | ||
b178f53e JG |
3027 | static |
3028 | enum lttng_error_code set_session_output_from_descriptor( | |
3029 | struct ltt_session *session, | |
3030 | const struct lttng_session_descriptor *descriptor) | |
2f77fc4b DG |
3031 | { |
3032 | int ret; | |
b178f53e JG |
3033 | enum lttng_error_code ret_code = LTTNG_OK; |
3034 | enum lttng_session_descriptor_type session_type = | |
3035 | lttng_session_descriptor_get_type(descriptor); | |
3036 | enum lttng_session_descriptor_output_type output_type = | |
3037 | lttng_session_descriptor_get_output_type(descriptor); | |
3038 | struct lttng_uri uris[2] = {}; | |
3039 | size_t uri_count = 0; | |
3040 | ||
3041 | switch (output_type) { | |
3042 | case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NONE: | |
3043 | goto end; | |
3044 | case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_LOCAL: | |
3045 | lttng_session_descriptor_get_local_output_uri(descriptor, | |
3046 | &uris[0]); | |
3047 | uri_count = 1; | |
3048 | break; | |
3049 | case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NETWORK: | |
3050 | lttng_session_descriptor_get_network_output_uris(descriptor, | |
3051 | &uris[0], &uris[1]); | |
3052 | uri_count = 2; | |
3053 | break; | |
3054 | default: | |
3055 | ret_code = LTTNG_ERR_INVALID; | |
e32d7f27 | 3056 | goto end; |
2f77fc4b DG |
3057 | } |
3058 | ||
b178f53e JG |
3059 | switch (session_type) { |
3060 | case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT: | |
3061 | { | |
3062 | struct snapshot_output *new_output = NULL; | |
3063 | ||
3064 | new_output = snapshot_output_alloc(); | |
3065 | if (!new_output) { | |
3066 | ret_code = LTTNG_ERR_NOMEM; | |
3067 | goto end; | |
3068 | } | |
3069 | ||
3070 | ret = snapshot_output_init_with_uri(session, | |
3071 | DEFAULT_SNAPSHOT_MAX_SIZE, | |
3072 | NULL, uris, uri_count, session->consumer, | |
3073 | new_output, &session->snapshot); | |
3074 | if (ret < 0) { | |
3075 | ret_code = (ret == -ENOMEM) ? | |
3076 | LTTNG_ERR_NOMEM : LTTNG_ERR_INVALID; | |
3077 | snapshot_output_destroy(new_output); | |
3078 | goto end; | |
3079 | } | |
3080 | snapshot_add_output(&session->snapshot, new_output); | |
3081 | break; | |
3082 | } | |
3083 | case LTTNG_SESSION_DESCRIPTOR_TYPE_REGULAR: | |
3084 | case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE: | |
3085 | { | |
7966af57 | 3086 | ret_code = (lttng_error_code) cmd_set_consumer_uri(session, uri_count, uris); |
b178f53e JG |
3087 | break; |
3088 | } | |
3089 | default: | |
3090 | ret_code = LTTNG_ERR_INVALID; | |
e32d7f27 | 3091 | goto end; |
2f77fc4b | 3092 | } |
b178f53e JG |
3093 | end: |
3094 | return ret_code; | |
3095 | } | |
3096 | ||
3097 | static | |
3098 | enum lttng_error_code cmd_create_session_from_descriptor( | |
3099 | struct lttng_session_descriptor *descriptor, | |
3100 | const lttng_sock_cred *creds, | |
3101 | const char *home_path) | |
3102 | { | |
3103 | int ret; | |
3104 | enum lttng_error_code ret_code; | |
3105 | const char *session_name; | |
3106 | struct ltt_session *new_session = NULL; | |
3107 | enum lttng_session_descriptor_status descriptor_status; | |
2f77fc4b | 3108 | |
e32d7f27 | 3109 | session_lock_list(); |
b178f53e JG |
3110 | if (home_path) { |
3111 | if (*home_path != '/') { | |
3112 | ERR("Home path provided by client is not absolute"); | |
3113 | ret_code = LTTNG_ERR_INVALID; | |
3114 | goto end; | |
3115 | } | |
3116 | } | |
2f77fc4b | 3117 | |
b178f53e JG |
3118 | descriptor_status = lttng_session_descriptor_get_session_name( |
3119 | descriptor, &session_name); | |
3120 | switch (descriptor_status) { | |
3121 | case LTTNG_SESSION_DESCRIPTOR_STATUS_OK: | |
3122 | break; | |
3123 | case LTTNG_SESSION_DESCRIPTOR_STATUS_UNSET: | |
3124 | session_name = NULL; | |
3125 | break; | |
3126 | default: | |
3127 | ret_code = LTTNG_ERR_INVALID; | |
3128 | goto end; | |
3129 | } | |
e3876bf0 | 3130 | |
b178f53e | 3131 | ret_code = session_create(session_name, creds->uid, creds->gid, |
e3876bf0 | 3132 | &new_session); |
b178f53e | 3133 | if (ret_code != LTTNG_OK) { |
e32d7f27 | 3134 | goto end; |
2f77fc4b DG |
3135 | } |
3136 | ||
b178f53e JG |
3137 | if (!session_name) { |
3138 | ret = lttng_session_descriptor_set_session_name(descriptor, | |
3139 | new_session->name); | |
3140 | if (ret) { | |
3141 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
3142 | goto end; | |
3143 | } | |
3144 | } | |
3145 | ||
3146 | if (!lttng_session_descriptor_is_output_destination_initialized( | |
3147 | descriptor)) { | |
3148 | /* | |
3149 | * Only include the session's creation time in the output | |
3150 | * destination if the name of the session itself was | |
3151 | * not auto-generated. | |
3152 | */ | |
3153 | ret_code = lttng_session_descriptor_set_default_output( | |
3154 | descriptor, | |
3155 | session_name ? &new_session->creation_time : NULL, | |
3156 | home_path); | |
3157 | if (ret_code != LTTNG_OK) { | |
e32d7f27 | 3158 | goto end; |
2bba9e53 | 3159 | } |
2bba9e53 | 3160 | } else { |
b178f53e JG |
3161 | new_session->has_user_specified_directory = |
3162 | lttng_session_descriptor_has_output_directory( | |
3163 | descriptor); | |
2f77fc4b DG |
3164 | } |
3165 | ||
b178f53e JG |
3166 | switch (lttng_session_descriptor_get_type(descriptor)) { |
3167 | case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT: | |
3168 | new_session->snapshot_mode = 1; | |
3169 | break; | |
3170 | case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE: | |
3171 | new_session->live_timer = | |
3172 | lttng_session_descriptor_live_get_timer_interval( | |
3173 | descriptor); | |
3174 | break; | |
3175 | default: | |
3176 | break; | |
3177 | } | |
2f77fc4b | 3178 | |
b178f53e JG |
3179 | ret_code = set_session_output_from_descriptor(new_session, descriptor); |
3180 | if (ret_code != LTTNG_OK) { | |
3181 | goto end; | |
3182 | } | |
3183 | new_session->consumer->enabled = 1; | |
3184 | ret_code = LTTNG_OK; | |
e32d7f27 | 3185 | end: |
b178f53e JG |
3186 | /* Release reference provided by the session_create function. */ |
3187 | session_put(new_session); | |
3188 | if (ret_code != LTTNG_OK && new_session) { | |
3189 | /* Release the global reference on error. */ | |
3190 | session_destroy(new_session); | |
e32d7f27 | 3191 | } |
b178f53e JG |
3192 | session_unlock_list(); |
3193 | return ret_code; | |
2f77fc4b DG |
3194 | } |
3195 | ||
b178f53e JG |
3196 | enum lttng_error_code cmd_create_session(struct command_ctx *cmd_ctx, int sock, |
3197 | struct lttng_session_descriptor **return_descriptor) | |
27babd3a DG |
3198 | { |
3199 | int ret; | |
b178f53e JG |
3200 | size_t payload_size; |
3201 | struct lttng_dynamic_buffer payload; | |
3202 | struct lttng_buffer_view home_dir_view; | |
3203 | struct lttng_buffer_view session_descriptor_view; | |
3204 | struct lttng_session_descriptor *session_descriptor = NULL; | |
3205 | enum lttng_error_code ret_code; | |
3206 | ||
3207 | lttng_dynamic_buffer_init(&payload); | |
3a91de3a | 3208 | if (cmd_ctx->lsm.u.create_session.home_dir_size >= |
b178f53e JG |
3209 | LTTNG_PATH_MAX) { |
3210 | ret_code = LTTNG_ERR_INVALID; | |
3211 | goto error; | |
27babd3a | 3212 | } |
3a91de3a | 3213 | if (cmd_ctx->lsm.u.create_session.session_descriptor_size > |
b178f53e JG |
3214 | LTTNG_SESSION_DESCRIPTOR_MAX_LEN) { |
3215 | ret_code = LTTNG_ERR_INVALID; | |
3216 | goto error; | |
27babd3a DG |
3217 | } |
3218 | ||
3a91de3a JG |
3219 | payload_size = cmd_ctx->lsm.u.create_session.home_dir_size + |
3220 | cmd_ctx->lsm.u.create_session.session_descriptor_size; | |
b178f53e JG |
3221 | ret = lttng_dynamic_buffer_set_size(&payload, payload_size); |
3222 | if (ret) { | |
3223 | ret_code = LTTNG_ERR_NOMEM; | |
3224 | goto error; | |
27babd3a DG |
3225 | } |
3226 | ||
b178f53e JG |
3227 | ret = lttcomm_recv_unix_sock(sock, payload.data, payload.size); |
3228 | if (ret <= 0) { | |
3229 | ERR("Reception of session descriptor failed, aborting."); | |
3230 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
3231 | goto error; | |
27babd3a DG |
3232 | } |
3233 | ||
b178f53e JG |
3234 | home_dir_view = lttng_buffer_view_from_dynamic_buffer( |
3235 | &payload, | |
3236 | 0, | |
3a91de3a | 3237 | cmd_ctx->lsm.u.create_session.home_dir_size); |
3e6e0df2 JG |
3238 | if (cmd_ctx->lsm.u.create_session.home_dir_size > 0 && |
3239 | !lttng_buffer_view_is_valid(&home_dir_view)) { | |
3240 | ERR("Invalid payload in \"create session\" command: buffer too short to contain home directory"); | |
3241 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; | |
3242 | goto error; | |
3243 | } | |
3244 | ||
b178f53e JG |
3245 | session_descriptor_view = lttng_buffer_view_from_dynamic_buffer( |
3246 | &payload, | |
3a91de3a JG |
3247 | cmd_ctx->lsm.u.create_session.home_dir_size, |
3248 | cmd_ctx->lsm.u.create_session.session_descriptor_size); | |
3e6e0df2 JG |
3249 | if (!lttng_buffer_view_is_valid(&session_descriptor_view)) { |
3250 | ERR("Invalid payload in \"create session\" command: buffer too short to contain session descriptor"); | |
3251 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; | |
3252 | goto error; | |
3253 | } | |
27babd3a | 3254 | |
b178f53e JG |
3255 | ret = lttng_session_descriptor_create_from_buffer( |
3256 | &session_descriptor_view, &session_descriptor); | |
3257 | if (ret < 0) { | |
3258 | ERR("Failed to create session descriptor from payload of \"create session\" command"); | |
3259 | ret_code = LTTNG_ERR_INVALID; | |
3260 | goto error; | |
3261 | } | |
27babd3a | 3262 | |
b178f53e JG |
3263 | /* |
3264 | * Sets the descriptor's auto-generated properties (name, output) if | |
3265 | * needed. | |
3266 | */ | |
3267 | ret_code = cmd_create_session_from_descriptor(session_descriptor, | |
3268 | &cmd_ctx->creds, | |
3269 | home_dir_view.size ? home_dir_view.data : NULL); | |
3270 | if (ret_code != LTTNG_OK) { | |
3271 | goto error; | |
e32d7f27 | 3272 | } |
b178f53e JG |
3273 | |
3274 | ret_code = LTTNG_OK; | |
3275 | *return_descriptor = session_descriptor; | |
3276 | session_descriptor = NULL; | |
3277 | error: | |
3278 | lttng_dynamic_buffer_reset(&payload); | |
3279 | lttng_session_descriptor_destroy(session_descriptor); | |
3280 | return ret_code; | |
27babd3a DG |
3281 | } |
3282 | ||
3e3665b8 JG |
3283 | static |
3284 | void cmd_destroy_session_reply(const struct ltt_session *session, | |
3285 | void *_reply_context) | |
3286 | { | |
3287 | int ret; | |
3288 | ssize_t comm_ret; | |
3289 | const struct cmd_destroy_session_reply_context *reply_context = | |
7966af57 | 3290 | (cmd_destroy_session_reply_context *) _reply_context; |
3e3665b8 JG |
3291 | struct lttng_dynamic_buffer payload; |
3292 | struct lttcomm_session_destroy_command_header cmd_header; | |
3293 | struct lttng_trace_archive_location *location = NULL; | |
3294 | struct lttcomm_lttng_msg llm = { | |
3295 | .cmd_type = LTTNG_DESTROY_SESSION, | |
3285a971 | 3296 | .ret_code = reply_context->destruction_status, |
3e3665b8 JG |
3297 | .pid = UINT32_MAX, |
3298 | .cmd_header_size = | |
3299 | sizeof(struct lttcomm_session_destroy_command_header), | |
3300 | .data_size = 0, | |
1c9a0b0e | 3301 | .fd_count = 0, |
3e3665b8 JG |
3302 | }; |
3303 | size_t payload_size_before_location; | |
3304 | ||
3305 | lttng_dynamic_buffer_init(&payload); | |
3306 | ||
3307 | ret = lttng_dynamic_buffer_append(&payload, &llm, sizeof(llm)); | |
0e270a1e | 3308 | if (ret) { |
3e3665b8 JG |
3309 | ERR("Failed to append session destruction message"); |
3310 | goto error; | |
0e270a1e | 3311 | } |
3e3665b8 JG |
3312 | |
3313 | cmd_header.rotation_state = | |
3314 | (int32_t) (reply_context->implicit_rotation_on_destroy ? | |
3315 | session->rotation_state : | |
3316 | LTTNG_ROTATION_STATE_NO_ROTATION); | |
3317 | ret = lttng_dynamic_buffer_append(&payload, &cmd_header, | |
3318 | sizeof(cmd_header)); | |
3319 | if (ret) { | |
3320 | ERR("Failed to append session destruction command header"); | |
3321 | goto error; | |
3322 | } | |
3323 | ||
3324 | if (!reply_context->implicit_rotation_on_destroy) { | |
3325 | DBG("No implicit rotation performed during the destruction of session \"%s\", sending reply", | |
3326 | session->name); | |
3327 | goto send_reply; | |
3328 | } | |
3329 | if (session->rotation_state != LTTNG_ROTATION_STATE_COMPLETED) { | |
3330 | DBG("Rotation state of session \"%s\" is not \"completed\", sending session destruction reply", | |
3331 | session->name); | |
3332 | goto send_reply; | |
3333 | } | |
3334 | ||
3335 | location = session_get_trace_archive_location(session); | |
3336 | if (!location) { | |
3337 | ERR("Failed to get the location of the trace archive produced during the destruction of session \"%s\"", | |
3338 | session->name); | |
3339 | goto error; | |
3340 | } | |
3341 | ||
3342 | payload_size_before_location = payload.size; | |
3343 | comm_ret = lttng_trace_archive_location_serialize(location, | |
3344 | &payload); | |
d3740619 | 3345 | lttng_trace_archive_location_put(location); |
3e3665b8 JG |
3346 | if (comm_ret < 0) { |
3347 | ERR("Failed to serialize the location of the trace archive produced during the destruction of session \"%s\"", | |
3348 | session->name); | |
3349 | goto error; | |
3350 | } | |
3351 | /* Update the message to indicate the location's length. */ | |
3352 | ((struct lttcomm_lttng_msg *) payload.data)->data_size = | |
3353 | payload.size - payload_size_before_location; | |
3354 | send_reply: | |
3355 | comm_ret = lttcomm_send_unix_sock(reply_context->reply_sock_fd, | |
3356 | payload.data, payload.size); | |
3357 | if (comm_ret != (ssize_t) payload.size) { | |
3358 | ERR("Failed to send result of the destruction of session \"%s\" to client", | |
3359 | session->name); | |
3360 | } | |
3361 | error: | |
3362 | ret = close(reply_context->reply_sock_fd); | |
3363 | if (ret) { | |
3364 | PERROR("Failed to close client socket in deferred session destroy reply"); | |
3365 | } | |
3366 | lttng_dynamic_buffer_reset(&payload); | |
3367 | free(_reply_context); | |
3368 | } | |
3369 | ||
2f77fc4b DG |
3370 | /* |
3371 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
a9ad0c8f MD |
3372 | * |
3373 | * Called with session lock held. | |
2f77fc4b | 3374 | */ |
e32d7f27 | 3375 | int cmd_destroy_session(struct ltt_session *session, |
3e3665b8 JG |
3376 | struct notification_thread_handle *notification_thread_handle, |
3377 | int *sock_fd) | |
2f77fc4b DG |
3378 | { |
3379 | int ret; | |
3285a971 | 3380 | enum lttng_error_code destruction_last_error = LTTNG_OK; |
3e3665b8 JG |
3381 | struct cmd_destroy_session_reply_context *reply_context = NULL; |
3382 | ||
3383 | if (sock_fd) { | |
64803277 | 3384 | reply_context = zmalloc<cmd_destroy_session_reply_context>(); |
3e3665b8 JG |
3385 | if (!reply_context) { |
3386 | ret = LTTNG_ERR_NOMEM; | |
3387 | goto end; | |
3388 | } | |
64803277 | 3389 | |
3e3665b8 JG |
3390 | reply_context->reply_sock_fd = *sock_fd; |
3391 | } | |
2f77fc4b DG |
3392 | |
3393 | /* Safety net */ | |
a0377dfe | 3394 | LTTNG_ASSERT(session); |
2f77fc4b | 3395 | |
3e3665b8 JG |
3396 | DBG("Begin destroy session %s (id %" PRIu64 ")", session->name, |
3397 | session->id); | |
3398 | if (session->active) { | |
3399 | DBG("Session \"%s\" is active, attempting to stop it before destroying it", | |
3400 | session->name); | |
3401 | ret = cmd_stop_trace(session); | |
3402 | if (ret != LTTNG_OK && ret != LTTNG_ERR_TRACE_ALREADY_STOPPED) { | |
3403 | /* Carry on with the destruction of the session. */ | |
3404 | ERR("Failed to stop session \"%s\" as part of its destruction: %s", | |
3405 | session->name, lttng_strerror(-ret)); | |
7966af57 | 3406 | destruction_last_error = (lttng_error_code) ret; |
3e3665b8 JG |
3407 | } |
3408 | } | |
5c408ad8 | 3409 | |
92816cc3 JG |
3410 | if (session->rotation_schedule_timer_enabled) { |
3411 | if (timer_session_rotation_schedule_timer_stop( | |
3412 | session)) { | |
3413 | ERR("Failed to stop the \"rotation schedule\" timer of session %s", | |
3414 | session->name); | |
3285a971 | 3415 | destruction_last_error = LTTNG_ERR_TIMER_STOP_ERROR; |
92816cc3 | 3416 | } |
259c2674 JD |
3417 | } |
3418 | ||
90936dcf JD |
3419 | if (session->rotate_size) { |
3420 | unsubscribe_session_consumed_size_rotation(session, notification_thread_handle); | |
3421 | session->rotate_size = 0; | |
3422 | } | |
3423 | ||
a7ceb342 | 3424 | if (session->rotated && session->current_trace_chunk && session->output_traces) { |
b5893d8e JG |
3425 | /* |
3426 | * Perform a last rotation on destruction if rotations have | |
3427 | * occurred during the session's lifetime. | |
3428 | */ | |
343defc2 MD |
3429 | ret = cmd_rotate_session(session, NULL, false, |
3430 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED); | |
d2956687 JG |
3431 | if (ret != LTTNG_OK) { |
3432 | ERR("Failed to perform an implicit rotation as part of the destruction of session \"%s\": %s", | |
3433 | session->name, lttng_strerror(-ret)); | |
7966af57 | 3434 | destruction_last_error = (lttng_error_code) -ret; |
124473a3 | 3435 | } |
0e270a1e | 3436 | if (reply_context) { |
3e3665b8 | 3437 | reply_context->implicit_rotation_on_destroy = true; |
0e270a1e JG |
3438 | } |
3439 | } else if (session->has_been_started && session->current_trace_chunk) { | |
7fdbed1c JG |
3440 | /* |
3441 | * The user has not triggered a session rotation. However, to | |
3442 | * ensure all data has been consumed, the session is rotated | |
3443 | * to a 'null' trace chunk before it is destroyed. | |
3444 | * | |
3445 | * This is a "quiet" rotation meaning that no notification is | |
3446 | * emitted and no renaming of the current trace chunk takes | |
3447 | * place. | |
3448 | */ | |
343defc2 MD |
3449 | ret = cmd_rotate_session(session, NULL, true, |
3450 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION); | |
53fb6336 JG |
3451 | /* |
3452 | * Rotation operations may not be supported by the kernel | |
3453 | * tracer. Hence, do not consider this implicit rotation as | |
3454 | * a session destruction error. The library has already stopped | |
3455 | * the session and waited for pending data; there is nothing | |
3456 | * left to do but complete the destruction of the session. | |
3457 | */ | |
3458 | if (ret != LTTNG_OK && | |
3459 | ret != -LTTNG_ERR_ROTATION_NOT_AVAILABLE_KERNEL) { | |
7fdbed1c | 3460 | ERR("Failed to perform a quiet rotation as part of the destruction of session \"%s\": %s", |
53fb6336 | 3461 | session->name, lttng_strerror(ret)); |
7966af57 | 3462 | destruction_last_error = (lttng_error_code) -ret; |
7fdbed1c JG |
3463 | } |
3464 | } | |
5c408ad8 | 3465 | |
a503e1ef JG |
3466 | if (session->shm_path[0]) { |
3467 | /* | |
3468 | * When a session is created with an explicit shm_path, | |
3469 | * the consumer daemon will create its shared memory files | |
3470 | * at that location and will *not* unlink them. This is normal | |
3471 | * as the intention of that feature is to make it possible | |
3472 | * to retrieve the content of those files should a crash occur. | |
3473 | * | |
3474 | * To ensure the content of those files can be used, the | |
3475 | * sessiond daemon will replicate the content of the metadata | |
3476 | * cache in a metadata file. | |
3477 | * | |
3478 | * On clean-up, it is expected that the consumer daemon will | |
3479 | * unlink the shared memory files and that the session daemon | |
3480 | * will unlink the metadata file. Then, the session's directory | |
3481 | * in the shm path can be removed. | |
3482 | * | |
3483 | * Unfortunately, a flaw in the design of the sessiond's and | |
3484 | * consumerd's tear down of channels makes it impossible to | |
3485 | * determine when the sessiond _and_ the consumerd have both | |
3486 | * destroyed their representation of a channel. For one, the | |
3487 | * unlinking, close, and rmdir happen in deferred 'call_rcu' | |
3488 | * callbacks in both daemons. | |
3489 | * | |
3490 | * However, it is also impossible for the sessiond to know when | |
3491 | * the consumer daemon is done destroying its channel(s) since | |
3492 | * it occurs as a reaction to the closing of the channel's file | |
3493 | * descriptor. There is no resulting communication initiated | |
3494 | * from the consumerd to the sessiond to confirm that the | |
3495 | * operation is completed (and was successful). | |
3496 | * | |
3497 | * Until this is all fixed, the session daemon checks for the | |
3498 | * removal of the session's shm path which makes it possible | |
3499 | * to safely advertise a session as having been destroyed. | |
3500 | * | |
3501 | * Prior to this fix, it was not possible to reliably save | |
3502 | * a session making use of the --shm-path option, destroy it, | |
3503 | * and load it again. This is because the creation of the | |
3504 | * session would fail upon seeing the session's shm path | |
3505 | * already in existence. | |
3506 | * | |
3507 | * Note that none of the error paths in the check for the | |
3508 | * directory's existence return an error. This is normal | |
3509 | * as there isn't much that can be done. The session will | |
3510 | * be destroyed properly, except that we can't offer the | |
3511 | * guarantee that the same session can be re-created. | |
3512 | */ | |
3513 | current_completion_handler = &destroy_completion_handler.handler; | |
3514 | ret = lttng_strncpy(destroy_completion_handler.shm_path, | |
3515 | session->shm_path, | |
3516 | sizeof(destroy_completion_handler.shm_path)); | |
a0377dfe | 3517 | LTTNG_ASSERT(!ret); |
a503e1ef | 3518 | } |
e32d7f27 JG |
3519 | |
3520 | /* | |
3521 | * The session is destroyed. However, note that the command context | |
3522 | * still holds a reference to the session, thus delaying its destruction | |
3523 | * _at least_ up to the point when that reference is released. | |
3524 | */ | |
3525 | session_destroy(session); | |
3e3665b8 | 3526 | if (reply_context) { |
3285a971 | 3527 | reply_context->destruction_status = destruction_last_error; |
3e3665b8 JG |
3528 | ret = session_add_destroy_notifier(session, |
3529 | cmd_destroy_session_reply, | |
3530 | (void *) reply_context); | |
3531 | if (ret) { | |
3532 | ret = LTTNG_ERR_FATAL; | |
3533 | goto end; | |
3534 | } else { | |
3535 | *sock_fd = -1; | |
3536 | } | |
0e270a1e JG |
3537 | } |
3538 | ret = LTTNG_OK; | |
3e3665b8 | 3539 | end: |
2f77fc4b DG |
3540 | return ret; |
3541 | } | |
3542 | ||
2f77fc4b DG |
3543 | /* |
3544 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
3545 | */ | |
56a37563 JG |
3546 | int cmd_register_consumer(struct ltt_session *session, |
3547 | enum lttng_domain_type domain, const char *sock_path, | |
3548 | struct consumer_data *cdata) | |
2f77fc4b DG |
3549 | { |
3550 | int ret, sock; | |
dd81b457 | 3551 | struct consumer_socket *socket = NULL; |
2f77fc4b | 3552 | |
a0377dfe FD |
3553 | LTTNG_ASSERT(session); |
3554 | LTTNG_ASSERT(cdata); | |
3555 | LTTNG_ASSERT(sock_path); | |
2f77fc4b DG |
3556 | |
3557 | switch (domain) { | |
3558 | case LTTNG_DOMAIN_KERNEL: | |
3559 | { | |
3560 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3561 | ||
a0377dfe | 3562 | LTTNG_ASSERT(ksess); |
2f77fc4b DG |
3563 | |
3564 | /* Can't register a consumer if there is already one */ | |
3565 | if (ksess->consumer_fds_sent != 0) { | |
f73fabfd | 3566 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
3567 | goto error; |
3568 | } | |
3569 | ||
3570 | sock = lttcomm_connect_unix_sock(sock_path); | |
3571 | if (sock < 0) { | |
f73fabfd | 3572 | ret = LTTNG_ERR_CONNECT_FAIL; |
2f77fc4b DG |
3573 | goto error; |
3574 | } | |
4ce514c4 | 3575 | cdata->cmd_sock = sock; |
2f77fc4b | 3576 | |
4ce514c4 | 3577 | socket = consumer_allocate_socket(&cdata->cmd_sock); |
2f77fc4b | 3578 | if (socket == NULL) { |
f66c074c DG |
3579 | ret = close(sock); |
3580 | if (ret < 0) { | |
3581 | PERROR("close register consumer"); | |
3582 | } | |
4ce514c4 | 3583 | cdata->cmd_sock = -1; |
f73fabfd | 3584 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
3585 | goto error; |
3586 | } | |
3587 | ||
64803277 | 3588 | socket->lock = zmalloc<pthread_mutex_t>(); |
2f77fc4b DG |
3589 | if (socket->lock == NULL) { |
3590 | PERROR("zmalloc pthread mutex"); | |
f73fabfd | 3591 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
3592 | goto error; |
3593 | } | |
64803277 | 3594 | |
2f77fc4b DG |
3595 | pthread_mutex_init(socket->lock, NULL); |
3596 | socket->registered = 1; | |
3597 | ||
3598 | rcu_read_lock(); | |
3599 | consumer_add_socket(socket, ksess->consumer); | |
3600 | rcu_read_unlock(); | |
3601 | ||
3602 | pthread_mutex_lock(&cdata->pid_mutex); | |
3603 | cdata->pid = -1; | |
3604 | pthread_mutex_unlock(&cdata->pid_mutex); | |
3605 | ||
3606 | break; | |
3607 | } | |
3608 | default: | |
3609 | /* TODO: Userspace tracing */ | |
f73fabfd | 3610 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3611 | goto error; |
3612 | } | |
3613 | ||
dd81b457 | 3614 | return LTTNG_OK; |
2f77fc4b DG |
3615 | |
3616 | error: | |
dd81b457 DG |
3617 | if (socket) { |
3618 | consumer_destroy_socket(socket); | |
3619 | } | |
2f77fc4b DG |
3620 | return ret; |
3621 | } | |
3622 | ||
3623 | /* | |
3624 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
3625 | */ | |
3626 | ssize_t cmd_list_domains(struct ltt_session *session, | |
3627 | struct lttng_domain **domains) | |
3628 | { | |
3629 | int ret, index = 0; | |
3630 | ssize_t nb_dom = 0; | |
fefd409b DG |
3631 | struct agent *agt; |
3632 | struct lttng_ht_iter iter; | |
2f77fc4b DG |
3633 | |
3634 | if (session->kernel_session != NULL) { | |
3635 | DBG3("Listing domains found kernel domain"); | |
3636 | nb_dom++; | |
3637 | } | |
3638 | ||
3639 | if (session->ust_session != NULL) { | |
3640 | DBG3("Listing domains found UST global domain"); | |
3641 | nb_dom++; | |
3c6a091f | 3642 | |
e0a74f01 | 3643 | rcu_read_lock(); |
fefd409b DG |
3644 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
3645 | agt, node.node) { | |
3646 | if (agt->being_used) { | |
3647 | nb_dom++; | |
3648 | } | |
3c6a091f | 3649 | } |
e0a74f01 | 3650 | rcu_read_unlock(); |
2f77fc4b DG |
3651 | } |
3652 | ||
fa64dfb4 JG |
3653 | if (!nb_dom) { |
3654 | goto end; | |
3655 | } | |
3656 | ||
64803277 | 3657 | *domains = calloc<lttng_domain>(nb_dom); |
2f77fc4b | 3658 | if (*domains == NULL) { |
f73fabfd | 3659 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
3660 | goto error; |
3661 | } | |
3662 | ||
3663 | if (session->kernel_session != NULL) { | |
3664 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
b5edb9e8 PP |
3665 | |
3666 | /* Kernel session buffer type is always GLOBAL */ | |
3667 | (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL; | |
3668 | ||
2f77fc4b DG |
3669 | index++; |
3670 | } | |
3671 | ||
3672 | if (session->ust_session != NULL) { | |
3673 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
88c5f0d8 | 3674 | (*domains)[index].buf_type = session->ust_session->buffer_type; |
2f77fc4b | 3675 | index++; |
3c6a091f | 3676 | |
e0a74f01 | 3677 | rcu_read_lock(); |
fefd409b DG |
3678 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
3679 | agt, node.node) { | |
3680 | if (agt->being_used) { | |
3681 | (*domains)[index].type = agt->domain; | |
3682 | (*domains)[index].buf_type = session->ust_session->buffer_type; | |
3683 | index++; | |
3684 | } | |
3c6a091f | 3685 | } |
e0a74f01 | 3686 | rcu_read_unlock(); |
2f77fc4b | 3687 | } |
fa64dfb4 | 3688 | end: |
2f77fc4b DG |
3689 | return nb_dom; |
3690 | ||
3691 | error: | |
f73fabfd DG |
3692 | /* Return negative value to differentiate return code */ |
3693 | return -ret; | |
2f77fc4b DG |
3694 | } |
3695 | ||
3696 | ||
3697 | /* | |
3698 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
3699 | */ | |
999af9c1 JR |
3700 | enum lttng_error_code cmd_list_channels(enum lttng_domain_type domain, |
3701 | struct ltt_session *session, | |
3702 | struct lttng_payload *payload) | |
2f77fc4b | 3703 | { |
999af9c1 JR |
3704 | int ret = 0; |
3705 | unsigned int i = 0; | |
3706 | struct lttcomm_list_command_header cmd_header = {}; | |
3707 | size_t cmd_header_offset; | |
3708 | enum lttng_error_code ret_code; | |
3709 | ||
3710 | assert(session); | |
3711 | assert(payload); | |
3712 | ||
3713 | DBG("Listing channels for session %s", session->name); | |
3714 | ||
3715 | cmd_header_offset = payload->buffer.size; | |
3716 | ||
3717 | /* Reserve space for command reply header. */ | |
3718 | ret = lttng_dynamic_buffer_set_size(&payload->buffer, | |
3719 | cmd_header_offset + sizeof(cmd_header)); | |
3720 | if (ret) { | |
3721 | ret_code = LTTNG_ERR_NOMEM; | |
3722 | goto end; | |
3723 | } | |
2f77fc4b DG |
3724 | |
3725 | switch (domain) { | |
3726 | case LTTNG_DOMAIN_KERNEL: | |
999af9c1 JR |
3727 | { |
3728 | /* Kernel channels */ | |
3729 | struct ltt_kernel_channel *kchan; | |
2f77fc4b | 3730 | if (session->kernel_session != NULL) { |
999af9c1 JR |
3731 | cds_list_for_each_entry(kchan, |
3732 | &session->kernel_session->channel_list.head, list) { | |
3733 | uint64_t discarded_events, lost_packets; | |
3734 | struct lttng_channel_extended *extended; | |
3735 | ||
3736 | extended = (struct lttng_channel_extended *) | |
3737 | kchan->channel->attr.extended.ptr; | |
3738 | ||
3739 | ret = get_kernel_runtime_stats(session, kchan, | |
3740 | &discarded_events, &lost_packets); | |
3741 | if (ret < 0) { | |
3742 | ret_code = LTTNG_ERR_UNK; | |
3743 | goto end; | |
3744 | } | |
3745 | ||
3746 | /* | |
3747 | * Update the discarded_events and lost_packets | |
3748 | * count for the channel | |
3749 | */ | |
3750 | extended->discarded_events = discarded_events; | |
3751 | extended->lost_packets = lost_packets; | |
3752 | ||
3753 | ret = lttng_channel_serialize( | |
3754 | kchan->channel, &payload->buffer); | |
3755 | if (ret) { | |
3756 | ERR("Failed to serialize lttng_channel: channel name = '%s'", | |
3757 | kchan->channel->name); | |
3758 | ret_code = LTTNG_ERR_UNK; | |
3759 | goto end; | |
3760 | } | |
3761 | ||
3762 | i++; | |
3763 | } | |
c7d620a2 | 3764 | } |
2f77fc4b | 3765 | break; |
999af9c1 | 3766 | } |
2f77fc4b | 3767 | case LTTNG_DOMAIN_UST: |
999af9c1 JR |
3768 | { |
3769 | struct lttng_ht_iter iter; | |
3770 | struct ltt_ust_channel *uchan; | |
3771 | ||
3772 | rcu_read_lock(); | |
3773 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, | |
3774 | &iter.iter, uchan, node.node) { | |
3775 | uint64_t discarded_events = 0, lost_packets = 0; | |
3776 | struct lttng_channel *channel = NULL; | |
3777 | struct lttng_channel_extended *extended; | |
3778 | ||
3779 | channel = trace_ust_channel_to_lttng_channel(uchan); | |
3780 | if (!channel) { | |
9402f166 JR |
3781 | ret_code = LTTNG_ERR_NOMEM; |
3782 | goto end; | |
999af9c1 JR |
3783 | } |
3784 | ||
3785 | extended = (struct lttng_channel_extended *) | |
3786 | channel->attr.extended.ptr; | |
3787 | ||
3788 | ret = get_ust_runtime_stats(session, uchan, | |
3789 | &discarded_events, &lost_packets); | |
3790 | if (ret < 0) { | |
3791 | lttng_channel_destroy(channel); | |
3792 | ret_code = LTTNG_ERR_UNK; | |
9402f166 | 3793 | goto end; |
999af9c1 JR |
3794 | } |
3795 | ||
3796 | extended->discarded_events = discarded_events; | |
3797 | extended->lost_packets = lost_packets; | |
3798 | ||
3799 | ret = lttng_channel_serialize( | |
3800 | channel, &payload->buffer); | |
3801 | if (ret) { | |
3802 | ERR("Failed to serialize lttng_channel: channel name = '%s'", | |
3803 | channel->name); | |
ae2275af | 3804 | lttng_channel_destroy(channel); |
999af9c1 | 3805 | ret_code = LTTNG_ERR_UNK; |
9402f166 | 3806 | goto end; |
999af9c1 JR |
3807 | } |
3808 | ||
ae2275af | 3809 | lttng_channel_destroy(channel); |
999af9c1 | 3810 | i++; |
c7d620a2 | 3811 | } |
999af9c1 | 3812 | rcu_read_unlock(); |
2f77fc4b | 3813 | break; |
999af9c1 | 3814 | } |
2f77fc4b | 3815 | default: |
999af9c1 | 3816 | break; |
2f77fc4b DG |
3817 | } |
3818 | ||
999af9c1 JR |
3819 | if (i > UINT32_MAX) { |
3820 | ERR("Channel count would overflow the channel listing command's reply"); | |
3821 | ret_code = LTTNG_ERR_OVERFLOW; | |
3822 | goto end; | |
2f77fc4b DG |
3823 | } |
3824 | ||
999af9c1 JR |
3825 | /* Update command reply header. */ |
3826 | cmd_header.count = (uint32_t) i; | |
3827 | memcpy(payload->buffer.data + cmd_header_offset, &cmd_header, | |
3828 | sizeof(cmd_header)); | |
3829 | ret_code = LTTNG_OK; | |
3830 | ||
53e367f9 | 3831 | end: |
999af9c1 | 3832 | return ret_code; |
2f77fc4b DG |
3833 | } |
3834 | ||
3835 | /* | |
3836 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3837 | */ | |
8ddd72ef JR |
3838 | enum lttng_error_code cmd_list_events(enum lttng_domain_type domain, |
3839 | struct ltt_session *session, | |
3840 | char *channel_name, | |
3841 | struct lttng_payload *reply_payload) | |
2f77fc4b | 3842 | { |
8ddd72ef JR |
3843 | int buffer_resize_ret; |
3844 | enum lttng_error_code ret_code = LTTNG_OK; | |
3845 | struct lttcomm_list_command_header reply_command_header = {}; | |
3846 | size_t reply_command_header_offset; | |
23831239 | 3847 | unsigned int nb_events = 0; |
e368fb43 | 3848 | |
8ddd72ef JR |
3849 | assert(reply_payload); |
3850 | ||
3851 | /* Reserve space for command reply header. */ | |
3852 | reply_command_header_offset = reply_payload->buffer.size; | |
3853 | buffer_resize_ret = lttng_dynamic_buffer_set_size(&reply_payload->buffer, | |
3854 | reply_command_header_offset + | |
3855 | sizeof(struct lttcomm_list_command_header)); | |
3856 | if (buffer_resize_ret) { | |
3857 | ret_code = LTTNG_ERR_NOMEM; | |
3858 | goto end; | |
e368fb43 | 3859 | } |
2f77fc4b DG |
3860 | |
3861 | switch (domain) { | |
3862 | case LTTNG_DOMAIN_KERNEL: | |
3863 | if (session->kernel_session != NULL) { | |
8ddd72ef JR |
3864 | ret_code = list_lttng_kernel_events(channel_name, |
3865 | session->kernel_session, reply_payload, &nb_events); | |
2f77fc4b | 3866 | } |
8ddd72ef | 3867 | |
2f77fc4b DG |
3868 | break; |
3869 | case LTTNG_DOMAIN_UST: | |
3870 | { | |
3871 | if (session->ust_session != NULL) { | |
8ddd72ef | 3872 | ret_code = list_lttng_ust_global_events(channel_name, |
e368fb43 | 3873 | &session->ust_session->domain_global, |
8ddd72ef | 3874 | reply_payload, &nb_events); |
2f77fc4b | 3875 | } |
8ddd72ef | 3876 | |
2f77fc4b DG |
3877 | break; |
3878 | } | |
5cdb6027 | 3879 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 3880 | case LTTNG_DOMAIN_JUL: |
0e115563 | 3881 | case LTTNG_DOMAIN_PYTHON: |
3c6a091f | 3882 | if (session->ust_session) { |
fefd409b DG |
3883 | struct lttng_ht_iter iter; |
3884 | struct agent *agt; | |
3885 | ||
b11feea5 | 3886 | rcu_read_lock(); |
fefd409b DG |
3887 | cds_lfht_for_each_entry(session->ust_session->agents->ht, |
3888 | &iter.iter, agt, node.node) { | |
1dfd9906 | 3889 | if (agt->domain == domain) { |
8ddd72ef JR |
3890 | ret_code = list_lttng_agent_events( |
3891 | agt, reply_payload, &nb_events); | |
1dfd9906 JG |
3892 | break; |
3893 | } | |
fefd409b | 3894 | } |
8ddd72ef | 3895 | |
b11feea5 | 3896 | rcu_read_unlock(); |
3c6a091f DG |
3897 | } |
3898 | break; | |
2f77fc4b | 3899 | default: |
8ddd72ef JR |
3900 | ret_code = LTTNG_ERR_UND; |
3901 | break; | |
2f77fc4b DG |
3902 | } |
3903 | ||
8ddd72ef JR |
3904 | if (nb_events > UINT32_MAX) { |
3905 | ret_code = LTTNG_ERR_OVERFLOW; | |
3906 | goto end; | |
3907 | } | |
e368fb43 | 3908 | |
8ddd72ef JR |
3909 | /* Update command reply header. */ |
3910 | reply_command_header.count = (uint32_t) nb_events; | |
3911 | memcpy(reply_payload->buffer.data + reply_command_header_offset, &reply_command_header, | |
3912 | sizeof(reply_command_header)); | |
2f77fc4b | 3913 | |
8ddd72ef JR |
3914 | end: |
3915 | return ret_code; | |
2f77fc4b DG |
3916 | } |
3917 | ||
3918 | /* | |
3919 | * Using the session list, filled a lttng_session array to send back to the | |
3920 | * client for session listing. | |
3921 | * | |
3922 | * The session list lock MUST be acquired before calling this function. Use | |
3923 | * session_lock_list() and session_unlock_list(). | |
3924 | */ | |
b178f53e JG |
3925 | void cmd_list_lttng_sessions(struct lttng_session *sessions, |
3926 | size_t session_count, uid_t uid, gid_t gid) | |
2f77fc4b DG |
3927 | { |
3928 | int ret; | |
3929 | unsigned int i = 0; | |
3930 | struct ltt_session *session; | |
3931 | struct ltt_session_list *list = session_get_list(); | |
0e270a1e | 3932 | struct lttng_session_extended *extended = |
b178f53e | 3933 | (typeof(extended)) (&sessions[session_count]); |
2f77fc4b DG |
3934 | |
3935 | DBG("Getting all available session for UID %d GID %d", | |
3936 | uid, gid); | |
3937 | /* | |
3938 | * Iterate over session list and append data after the control struct in | |
3939 | * the buffer. | |
3940 | */ | |
3941 | cds_list_for_each_entry(session, &list->head, list) { | |
e32d7f27 JG |
3942 | if (!session_get(session)) { |
3943 | continue; | |
3944 | } | |
2f77fc4b DG |
3945 | /* |
3946 | * Only list the sessions the user can control. | |
3947 | */ | |
d7b377ed | 3948 | if (!session_access_ok(session, uid) || |
e32d7f27 JG |
3949 | session->destroyed) { |
3950 | session_put(session); | |
2f77fc4b DG |
3951 | continue; |
3952 | } | |
3953 | ||
3954 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3955 | struct ltt_ust_session *usess = session->ust_session; | |
3956 | ||
3957 | if (session->consumer->type == CONSUMER_DST_NET || | |
3958 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
3959 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
3960 | ret = build_network_session_path(sessions[i].path, | |
dec56f6c | 3961 | sizeof(sessions[i].path), session); |
2f77fc4b | 3962 | } else { |
dec56f6c | 3963 | ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s", |
366a9222 | 3964 | session->consumer->dst.session_root_path); |
2f77fc4b DG |
3965 | } |
3966 | if (ret < 0) { | |
3967 | PERROR("snprintf session path"); | |
e32d7f27 | 3968 | session_put(session); |
2f77fc4b DG |
3969 | continue; |
3970 | } | |
3971 | ||
3972 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
3973 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
8382cf6f | 3974 | sessions[i].enabled = session->active; |
2cbf8fed | 3975 | sessions[i].snapshot_mode = session->snapshot_mode; |
8960e9cd | 3976 | sessions[i].live_timer_interval = session->live_timer; |
b178f53e JG |
3977 | extended[i].creation_time.value = (uint64_t) session->creation_time; |
3978 | extended[i].creation_time.is_set = 1; | |
2f77fc4b | 3979 | i++; |
e32d7f27 | 3980 | session_put(session); |
2f77fc4b DG |
3981 | } |
3982 | } | |
3983 | ||
806e2684 | 3984 | /* |
6d805429 | 3985 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
d3f14b8a | 3986 | * ready for trace analysis (or any kind of reader) or else 1 for pending data. |
806e2684 | 3987 | */ |
6d805429 | 3988 | int cmd_data_pending(struct ltt_session *session) |
806e2684 DG |
3989 | { |
3990 | int ret; | |
3991 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3992 | struct ltt_ust_session *usess = session->ust_session; | |
3993 | ||
a0377dfe | 3994 | LTTNG_ASSERT(session); |
806e2684 | 3995 | |
5c408ad8 JD |
3996 | DBG("Data pending for session %s", session->name); |
3997 | ||
806e2684 | 3998 | /* Session MUST be stopped to ask for data availability. */ |
8382cf6f | 3999 | if (session->active) { |
806e2684 DG |
4000 | ret = LTTNG_ERR_SESSION_STARTED; |
4001 | goto error; | |
3a89d11a DG |
4002 | } else { |
4003 | /* | |
4004 | * If stopped, just make sure we've started before else the above call | |
4005 | * will always send that there is data pending. | |
4006 | * | |
4007 | * The consumer assumes that when the data pending command is received, | |
4008 | * the trace has been started before or else no output data is written | |
4009 | * by the streams which is a condition for data pending. So, this is | |
4010 | * *VERY* important that we don't ask the consumer before a start | |
4011 | * trace. | |
4012 | */ | |
8382cf6f | 4013 | if (!session->has_been_started) { |
3a89d11a DG |
4014 | ret = 0; |
4015 | goto error; | |
4016 | } | |
806e2684 DG |
4017 | } |
4018 | ||
92816cc3 JG |
4019 | /* A rotation is still pending, we have to wait. */ |
4020 | if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) { | |
5c408ad8 JD |
4021 | DBG("Rotate still pending for session %s", session->name); |
4022 | ret = 1; | |
4023 | goto error; | |
4024 | } | |
4025 | ||
806e2684 | 4026 | if (ksess && ksess->consumer) { |
6d805429 DG |
4027 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
4028 | if (ret == 1) { | |
806e2684 DG |
4029 | /* Data is still being extracted for the kernel. */ |
4030 | goto error; | |
4031 | } | |
4032 | } | |
4033 | ||
4034 | if (usess && usess->consumer) { | |
6d805429 DG |
4035 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
4036 | if (ret == 1) { | |
806e2684 DG |
4037 | /* Data is still being extracted for the kernel. */ |
4038 | goto error; | |
4039 | } | |
4040 | } | |
4041 | ||
4042 | /* Data is ready to be read by a viewer */ | |
6d805429 | 4043 | ret = 0; |
806e2684 DG |
4044 | |
4045 | error: | |
4046 | return ret; | |
4047 | } | |
4048 | ||
6dc3064a DG |
4049 | /* |
4050 | * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library. | |
4051 | * | |
4052 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
4053 | */ | |
4054 | int cmd_snapshot_add_output(struct ltt_session *session, | |
df4f5a87 | 4055 | const struct lttng_snapshot_output *output, uint32_t *id) |
6dc3064a DG |
4056 | { |
4057 | int ret; | |
4058 | struct snapshot_output *new_output; | |
4059 | ||
a0377dfe FD |
4060 | LTTNG_ASSERT(session); |
4061 | LTTNG_ASSERT(output); | |
6dc3064a DG |
4062 | |
4063 | DBG("Cmd snapshot add output for session %s", session->name); | |
4064 | ||
4065 | /* | |
903ef685 | 4066 | * Can't create an output if the session is not set in no-output mode. |
6dc3064a DG |
4067 | */ |
4068 | if (session->output_traces) { | |
903ef685 | 4069 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
4070 | goto error; |
4071 | } | |
4072 | ||
54213acc JG |
4073 | if (session->has_non_mmap_channel) { |
4074 | ret = LTTNG_ERR_SNAPSHOT_UNSUPPORTED; | |
4075 | goto error; | |
4076 | } | |
4077 | ||
6dc3064a DG |
4078 | /* Only one output is allowed until we have the "tee" feature. */ |
4079 | if (session->snapshot.nb_output == 1) { | |
4080 | ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST; | |
4081 | goto error; | |
4082 | } | |
4083 | ||
4084 | new_output = snapshot_output_alloc(); | |
4085 | if (!new_output) { | |
4086 | ret = LTTNG_ERR_NOMEM; | |
4087 | goto error; | |
4088 | } | |
4089 | ||
b178f53e | 4090 | ret = snapshot_output_init(session, output->max_size, output->name, |
6dc3064a DG |
4091 | output->ctrl_url, output->data_url, session->consumer, new_output, |
4092 | &session->snapshot); | |
4093 | if (ret < 0) { | |
4094 | if (ret == -ENOMEM) { | |
4095 | ret = LTTNG_ERR_NOMEM; | |
4096 | } else { | |
4097 | ret = LTTNG_ERR_INVALID; | |
4098 | } | |
4099 | goto free_error; | |
4100 | } | |
4101 | ||
6dc3064a DG |
4102 | rcu_read_lock(); |
4103 | snapshot_add_output(&session->snapshot, new_output); | |
4104 | if (id) { | |
4105 | *id = new_output->id; | |
4106 | } | |
4107 | rcu_read_unlock(); | |
4108 | ||
4109 | return LTTNG_OK; | |
4110 | ||
4111 | free_error: | |
4112 | snapshot_output_destroy(new_output); | |
4113 | error: | |
4114 | return ret; | |
4115 | } | |
4116 | ||
4117 | /* | |
4118 | * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl. | |
4119 | * | |
4120 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
4121 | */ | |
4122 | int cmd_snapshot_del_output(struct ltt_session *session, | |
df4f5a87 | 4123 | const struct lttng_snapshot_output *output) |
6dc3064a DG |
4124 | { |
4125 | int ret; | |
eb240553 | 4126 | struct snapshot_output *sout = NULL; |
6dc3064a | 4127 | |
a0377dfe FD |
4128 | LTTNG_ASSERT(session); |
4129 | LTTNG_ASSERT(output); | |
6dc3064a | 4130 | |
6dc3064a DG |
4131 | rcu_read_lock(); |
4132 | ||
4133 | /* | |
d3f14b8a MD |
4134 | * Permission denied to create an output if the session is not |
4135 | * set in no output mode. | |
6dc3064a DG |
4136 | */ |
4137 | if (session->output_traces) { | |
903ef685 | 4138 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
4139 | goto error; |
4140 | } | |
4141 | ||
eb240553 DG |
4142 | if (output->id) { |
4143 | DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id, | |
4144 | session->name); | |
4145 | sout = snapshot_find_output_by_id(output->id, &session->snapshot); | |
4146 | } else if (*output->name != '\0') { | |
4147 | DBG("Cmd snapshot del output name %s for session %s", output->name, | |
4148 | session->name); | |
4149 | sout = snapshot_find_output_by_name(output->name, &session->snapshot); | |
4150 | } | |
6dc3064a DG |
4151 | if (!sout) { |
4152 | ret = LTTNG_ERR_INVALID; | |
4153 | goto error; | |
4154 | } | |
4155 | ||
4156 | snapshot_delete_output(&session->snapshot, sout); | |
4157 | snapshot_output_destroy(sout); | |
4158 | ret = LTTNG_OK; | |
4159 | ||
4160 | error: | |
4161 | rcu_read_unlock(); | |
4162 | return ret; | |
4163 | } | |
4164 | ||
4165 | /* | |
4166 | * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl. | |
4167 | * | |
4168 | * If no output is available, outputs is untouched and 0 is returned. | |
4169 | * | |
4170 | * Return the size of the newly allocated outputs or a negative LTTNG_ERR code. | |
4171 | */ | |
4172 | ssize_t cmd_snapshot_list_outputs(struct ltt_session *session, | |
4173 | struct lttng_snapshot_output **outputs) | |
4174 | { | |
4175 | int ret, idx = 0; | |
b223ca94 | 4176 | struct lttng_snapshot_output *list = NULL; |
6dc3064a DG |
4177 | struct lttng_ht_iter iter; |
4178 | struct snapshot_output *output; | |
4179 | ||
a0377dfe FD |
4180 | LTTNG_ASSERT(session); |
4181 | LTTNG_ASSERT(outputs); | |
6dc3064a DG |
4182 | |
4183 | DBG("Cmd snapshot list outputs for session %s", session->name); | |
4184 | ||
4185 | /* | |
d3f14b8a MD |
4186 | * Permission denied to create an output if the session is not |
4187 | * set in no output mode. | |
6dc3064a DG |
4188 | */ |
4189 | if (session->output_traces) { | |
903ef685 JG |
4190 | ret = -LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
4191 | goto end; | |
6dc3064a DG |
4192 | } |
4193 | ||
4194 | if (session->snapshot.nb_output == 0) { | |
4195 | ret = 0; | |
903ef685 | 4196 | goto end; |
6dc3064a DG |
4197 | } |
4198 | ||
64803277 | 4199 | list = calloc<lttng_snapshot_output>(session->snapshot.nb_output); |
6dc3064a | 4200 | if (!list) { |
b223ca94 | 4201 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 4202 | goto end; |
6dc3064a DG |
4203 | } |
4204 | ||
4205 | /* Copy list from session to the new list object. */ | |
b223ca94 | 4206 | rcu_read_lock(); |
6dc3064a DG |
4207 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter, |
4208 | output, node.node) { | |
a0377dfe | 4209 | LTTNG_ASSERT(output->consumer); |
6dc3064a DG |
4210 | list[idx].id = output->id; |
4211 | list[idx].max_size = output->max_size; | |
6ce22875 MD |
4212 | if (lttng_strncpy(list[idx].name, output->name, |
4213 | sizeof(list[idx].name))) { | |
4214 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 4215 | goto error; |
6ce22875 | 4216 | } |
6dc3064a | 4217 | if (output->consumer->type == CONSUMER_DST_LOCAL) { |
6ce22875 | 4218 | if (lttng_strncpy(list[idx].ctrl_url, |
366a9222 | 4219 | output->consumer->dst.session_root_path, |
6ce22875 MD |
4220 | sizeof(list[idx].ctrl_url))) { |
4221 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 4222 | goto error; |
6ce22875 | 4223 | } |
6dc3064a DG |
4224 | } else { |
4225 | /* Control URI. */ | |
4226 | ret = uri_to_str_url(&output->consumer->dst.net.control, | |
4227 | list[idx].ctrl_url, sizeof(list[idx].ctrl_url)); | |
4228 | if (ret < 0) { | |
b223ca94 | 4229 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 4230 | goto error; |
6dc3064a DG |
4231 | } |
4232 | ||
4233 | /* Data URI. */ | |
4234 | ret = uri_to_str_url(&output->consumer->dst.net.data, | |
4235 | list[idx].data_url, sizeof(list[idx].data_url)); | |
4236 | if (ret < 0) { | |
b223ca94 | 4237 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 4238 | goto error; |
6dc3064a DG |
4239 | } |
4240 | } | |
4241 | idx++; | |
4242 | } | |
4243 | ||
4244 | *outputs = list; | |
b223ca94 JG |
4245 | list = NULL; |
4246 | ret = session->snapshot.nb_output; | |
6dc3064a | 4247 | error: |
903ef685 | 4248 | rcu_read_unlock(); |
b223ca94 | 4249 | free(list); |
903ef685 | 4250 | end: |
b223ca94 | 4251 | return ret; |
6dc3064a DG |
4252 | } |
4253 | ||
93ec662e JD |
4254 | /* |
4255 | * Check if we can regenerate the metadata for this session. | |
4256 | * Only kernel, UST per-uid and non-live sessions are supported. | |
4257 | * | |
4258 | * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise. | |
4259 | */ | |
4260 | static | |
eded6438 | 4261 | int check_regenerate_metadata_support(struct ltt_session *session) |
93ec662e JD |
4262 | { |
4263 | int ret; | |
4264 | ||
a0377dfe | 4265 | LTTNG_ASSERT(session); |
93ec662e JD |
4266 | |
4267 | if (session->live_timer != 0) { | |
4268 | ret = LTTNG_ERR_LIVE_SESSION; | |
4269 | goto end; | |
4270 | } | |
4271 | if (!session->active) { | |
4272 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
4273 | goto end; | |
4274 | } | |
4275 | if (session->ust_session) { | |
4276 | switch (session->ust_session->buffer_type) { | |
4277 | case LTTNG_BUFFER_PER_UID: | |
4278 | break; | |
4279 | case LTTNG_BUFFER_PER_PID: | |
4280 | ret = LTTNG_ERR_PER_PID_SESSION; | |
4281 | goto end; | |
4282 | default: | |
a0377dfe | 4283 | abort(); |
93ec662e JD |
4284 | ret = LTTNG_ERR_UNK; |
4285 | goto end; | |
4286 | } | |
4287 | } | |
4288 | if (session->consumer->type == CONSUMER_DST_NET && | |
4289 | session->consumer->relay_minor_version < 8) { | |
4290 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; | |
4291 | goto end; | |
4292 | } | |
4293 | ret = 0; | |
4294 | ||
4295 | end: | |
4296 | return ret; | |
4297 | } | |
4298 | ||
7802bae3 LL |
4299 | static |
4300 | int clear_metadata_file(int fd) | |
4301 | { | |
4302 | int ret; | |
a5df8828 | 4303 | off_t lseek_ret; |
7802bae3 | 4304 | |
a5df8828 GL |
4305 | lseek_ret = lseek(fd, 0, SEEK_SET); |
4306 | if (lseek_ret < 0) { | |
7802bae3 | 4307 | PERROR("lseek"); |
a5df8828 | 4308 | ret = -1; |
7802bae3 LL |
4309 | goto end; |
4310 | } | |
4311 | ||
4312 | ret = ftruncate(fd, 0); | |
4313 | if (ret < 0) { | |
4314 | PERROR("ftruncate"); | |
4315 | goto end; | |
4316 | } | |
4317 | ||
4318 | end: | |
4319 | return ret; | |
4320 | } | |
4321 | ||
93ec662e | 4322 | static |
eded6438 | 4323 | int ust_regenerate_metadata(struct ltt_ust_session *usess) |
93ec662e JD |
4324 | { |
4325 | int ret = 0; | |
4326 | struct buffer_reg_uid *uid_reg = NULL; | |
4327 | struct buffer_reg_session *session_reg = NULL; | |
4328 | ||
4329 | rcu_read_lock(); | |
4330 | cds_list_for_each_entry(uid_reg, &usess->buffer_reg_uid_list, lnode) { | |
aeeb48c6 | 4331 | ust_registry_session *registry; |
93ec662e JD |
4332 | struct ust_registry_channel *chan; |
4333 | struct lttng_ht_iter iter_chan; | |
4334 | ||
4335 | session_reg = uid_reg->registry; | |
4336 | registry = session_reg->reg.ust; | |
4337 | ||
aeeb48c6 JG |
4338 | pthread_mutex_lock(®istry->_lock); |
4339 | registry->_metadata_len_sent = 0; | |
4340 | memset(registry->_metadata, 0, registry->_metadata_alloc_len); | |
4341 | registry->_metadata_len = 0; | |
4342 | registry->_metadata_version++; | |
4343 | if (registry->_metadata_fd > 0) { | |
7802bae3 | 4344 | /* Clear the metadata file's content. */ |
aeeb48c6 | 4345 | ret = clear_metadata_file(registry->_metadata_fd); |
7802bae3 | 4346 | if (ret) { |
aeeb48c6 | 4347 | pthread_mutex_unlock(®istry->_lock); |
7802bae3 LL |
4348 | goto end; |
4349 | } | |
4350 | } | |
4351 | ||
aeeb48c6 | 4352 | ret = ust_metadata_session_statedump(registry); |
93ec662e | 4353 | if (ret) { |
aeeb48c6 | 4354 | pthread_mutex_unlock(®istry->_lock); |
93ec662e JD |
4355 | ERR("Failed to generate session metadata (err = %d)", |
4356 | ret); | |
4357 | goto end; | |
4358 | } | |
aeeb48c6 | 4359 | cds_lfht_for_each_entry(registry->_channels->ht, &iter_chan.iter, |
93ec662e JD |
4360 | chan, node.node) { |
4361 | struct ust_registry_event *event; | |
4362 | struct lttng_ht_iter iter_event; | |
4363 | ||
bacc39bb SM |
4364 | chan->metadata_dumped = 0; |
4365 | ||
93ec662e JD |
4366 | ret = ust_metadata_channel_statedump(registry, chan); |
4367 | if (ret) { | |
aeeb48c6 | 4368 | pthread_mutex_unlock(®istry->_lock); |
93ec662e JD |
4369 | ERR("Failed to generate channel metadata " |
4370 | "(err = %d)", ret); | |
4371 | goto end; | |
4372 | } | |
0d19be9d | 4373 | cds_lfht_for_each_entry(chan->events->ht, &iter_event.iter, |
bacc39bb SM |
4374 | event, node.node) { |
4375 | event->metadata_dumped = 0; | |
93ec662e JD |
4376 | ret = ust_metadata_event_statedump(registry, |
4377 | chan, event); | |
4378 | if (ret) { | |
aeeb48c6 | 4379 | pthread_mutex_unlock(®istry->_lock); |
93ec662e JD |
4380 | ERR("Failed to generate event metadata " |
4381 | "(err = %d)", ret); | |
4382 | goto end; | |
4383 | } | |
4384 | } | |
4385 | } | |
aeeb48c6 | 4386 | pthread_mutex_unlock(®istry->_lock); |
93ec662e JD |
4387 | } |
4388 | ||
4389 | end: | |
4390 | rcu_read_unlock(); | |
4391 | return ret; | |
4392 | } | |
4393 | ||
4394 | /* | |
eded6438 | 4395 | * Command LTTNG_REGENERATE_METADATA from the lttng-ctl library. |
93ec662e JD |
4396 | * |
4397 | * Ask the consumer to truncate the existing metadata file(s) and | |
4398 | * then regenerate the metadata. Live and per-pid sessions are not | |
4399 | * supported and return an error. | |
4400 | * | |
1136f41b | 4401 | * Return LTTNG_OK on success or else a LTTNG_ERR code. |
93ec662e | 4402 | */ |
eded6438 | 4403 | int cmd_regenerate_metadata(struct ltt_session *session) |
93ec662e JD |
4404 | { |
4405 | int ret; | |
4406 | ||
a0377dfe | 4407 | LTTNG_ASSERT(session); |
93ec662e | 4408 | |
eded6438 | 4409 | ret = check_regenerate_metadata_support(session); |
93ec662e JD |
4410 | if (ret) { |
4411 | goto end; | |
4412 | } | |
4413 | ||
4414 | if (session->kernel_session) { | |
eded6438 | 4415 | ret = kernctl_session_regenerate_metadata( |
93ec662e JD |
4416 | session->kernel_session->fd); |
4417 | if (ret < 0) { | |
4418 | ERR("Failed to regenerate the kernel metadata"); | |
4419 | goto end; | |
4420 | } | |
4421 | } | |
4422 | ||
4423 | if (session->ust_session) { | |
eded6438 | 4424 | ret = ust_regenerate_metadata(session->ust_session); |
93ec662e JD |
4425 | if (ret < 0) { |
4426 | ERR("Failed to regenerate the UST metadata"); | |
4427 | goto end; | |
4428 | } | |
4429 | } | |
4430 | DBG("Cmd metadata regenerate for session %s", session->name); | |
4431 | ret = LTTNG_OK; | |
4432 | ||
4433 | end: | |
4434 | return ret; | |
4435 | } | |
4436 | ||
c2561365 JD |
4437 | /* |
4438 | * Command LTTNG_REGENERATE_STATEDUMP from the lttng-ctl library. | |
4439 | * | |
4440 | * Ask the tracer to regenerate a new statedump. | |
4441 | * | |
1136f41b | 4442 | * Return LTTNG_OK on success or else a LTTNG_ERR code. |
c2561365 JD |
4443 | */ |
4444 | int cmd_regenerate_statedump(struct ltt_session *session) | |
4445 | { | |
4446 | int ret; | |
4447 | ||
a0377dfe | 4448 | LTTNG_ASSERT(session); |
c2561365 JD |
4449 | |
4450 | if (!session->active) { | |
4451 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
4452 | goto end; | |
4453 | } | |
c2561365 JD |
4454 | |
4455 | if (session->kernel_session) { | |
4456 | ret = kernctl_session_regenerate_statedump( | |
4457 | session->kernel_session->fd); | |
4458 | /* | |
4459 | * Currently, the statedump in kernel can only fail if out | |
4460 | * of memory. | |
4461 | */ | |
4462 | if (ret < 0) { | |
4463 | if (ret == -ENOMEM) { | |
4464 | ret = LTTNG_ERR_REGEN_STATEDUMP_NOMEM; | |
4465 | } else { | |
4466 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
4467 | } | |
4468 | ERR("Failed to regenerate the kernel statedump"); | |
4469 | goto end; | |
4470 | } | |
4471 | } | |
4472 | ||
4473 | if (session->ust_session) { | |
4474 | ret = ust_app_regenerate_statedump_all(session->ust_session); | |
4475 | /* | |
4476 | * Currently, the statedump in UST always returns 0. | |
4477 | */ | |
4478 | if (ret < 0) { | |
4479 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
4480 | ERR("Failed to regenerate the UST statedump"); | |
4481 | goto end; | |
4482 | } | |
4483 | } | |
4484 | DBG("Cmd regenerate statedump for session %s", session->name); | |
4485 | ret = LTTNG_OK; | |
4486 | ||
4487 | end: | |
4488 | return ret; | |
4489 | } | |
4490 | ||
989a0844 FD |
4491 | static |
4492 | enum lttng_error_code synchronize_tracer_notifier_register( | |
4493 | struct notification_thread_handle *notification_thread, | |
4494 | struct lttng_trigger *trigger, const struct lttng_credentials *cmd_creds) | |
70670472 | 4495 | { |
989a0844 | 4496 | enum lttng_error_code ret_code; |
7c1f6da2 JG |
4497 | const struct lttng_condition *condition = |
4498 | lttng_trigger_get_const_condition(trigger); | |
989a0844 FD |
4499 | const char *trigger_name; |
4500 | uid_t trigger_owner; | |
4501 | enum lttng_trigger_status trigger_status; | |
4502 | const enum lttng_domain_type trigger_domain = | |
4503 | lttng_trigger_get_underlying_domain_type_restriction( | |
4504 | trigger); | |
70670472 | 4505 | |
989a0844 | 4506 | trigger_status = lttng_trigger_get_owner_uid(trigger, &trigger_owner); |
a0377dfe | 4507 | LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK); |
989a0844 | 4508 | |
a0377dfe FD |
4509 | LTTNG_ASSERT(condition); |
4510 | LTTNG_ASSERT(lttng_condition_get_type(condition) == | |
8dbb86b8 | 4511 | LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES); |
989a0844 FD |
4512 | |
4513 | trigger_status = lttng_trigger_get_name(trigger, &trigger_name); | |
4514 | trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ? | |
0efb2ad7 | 4515 | trigger_name : "(anonymous)"; |
989a0844 FD |
4516 | |
4517 | session_lock_list(); | |
4518 | switch (trigger_domain) { | |
4519 | case LTTNG_DOMAIN_KERNEL: | |
4520 | { | |
4521 | ret_code = kernel_register_event_notifier(trigger, cmd_creds); | |
4522 | if (ret_code != LTTNG_OK) { | |
4523 | enum lttng_error_code notif_thread_unregister_ret; | |
4524 | ||
4525 | notif_thread_unregister_ret = | |
4526 | notification_thread_command_unregister_trigger( | |
4527 | notification_thread, trigger); | |
4528 | ||
4529 | if (notif_thread_unregister_ret != LTTNG_OK) { | |
4530 | /* Return the original error code. */ | |
4531 | ERR("Failed to unregister trigger from notification thread during error recovery: trigger name = '%s', trigger owner uid = %d, error code = %d", | |
4532 | trigger_name, | |
4533 | (int) trigger_owner, | |
4534 | ret_code); | |
4535 | } | |
4536 | } | |
4537 | break; | |
70670472 | 4538 | } |
989a0844 FD |
4539 | case LTTNG_DOMAIN_UST: |
4540 | ust_app_global_update_all_event_notifier_rules(); | |
4541 | break; | |
4542 | case LTTNG_DOMAIN_JUL: | |
4543 | case LTTNG_DOMAIN_LOG4J: | |
4544 | case LTTNG_DOMAIN_PYTHON: | |
4545 | { | |
4546 | /* Agent domains. */ | |
4547 | struct agent *agt = agent_find_by_event_notifier_domain( | |
4548 | trigger_domain); | |
70670472 | 4549 | |
989a0844 FD |
4550 | if (!agt) { |
4551 | agt = agent_create(trigger_domain); | |
4552 | if (!agt) { | |
4553 | ret_code = LTTNG_ERR_NOMEM; | |
4554 | goto end_unlock_session_list; | |
4555 | } | |
4556 | ||
412d7227 | 4557 | agent_add(agt, the_trigger_agents_ht_by_domain); |
989a0844 FD |
4558 | } |
4559 | ||
7966af57 | 4560 | ret_code = (lttng_error_code) trigger_agent_enable(trigger, agt); |
989a0844 FD |
4561 | if (ret_code != LTTNG_OK) { |
4562 | goto end_unlock_session_list; | |
4563 | } | |
4564 | ||
4565 | break; | |
4566 | } | |
4567 | case LTTNG_DOMAIN_NONE: | |
4568 | default: | |
4569 | abort(); | |
4570 | } | |
4571 | ||
4572 | ret_code = LTTNG_OK; | |
4573 | end_unlock_session_list: | |
4574 | session_unlock_list(); | |
70670472 JR |
4575 | return ret_code; |
4576 | } | |
4577 | ||
4578 | enum lttng_error_code cmd_register_trigger(const struct lttng_credentials *cmd_creds, | |
746e08d7 | 4579 | struct lttng_trigger *trigger, |
0efb2ad7 | 4580 | bool is_trigger_anonymous, |
242388e4 JR |
4581 | struct notification_thread_handle *notification_thread, |
4582 | struct lttng_trigger **return_trigger) | |
b0880ae5 | 4583 | { |
70670472 | 4584 | enum lttng_error_code ret_code; |
70670472 JR |
4585 | const char *trigger_name; |
4586 | uid_t trigger_owner; | |
4587 | enum lttng_trigger_status trigger_status; | |
4588 | ||
4589 | trigger_status = lttng_trigger_get_name(trigger, &trigger_name); | |
ce0b1d61 | 4590 | trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ? |
0efb2ad7 | 4591 | trigger_name : "(anonymous)"; |
ce0b1d61 | 4592 | |
70670472 JR |
4593 | trigger_status = lttng_trigger_get_owner_uid( |
4594 | trigger, &trigger_owner); | |
a0377dfe | 4595 | LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK); |
70670472 JR |
4596 | |
4597 | DBG("Running register trigger command: trigger name = '%s', trigger owner uid = %d, command creds uid = %d", | |
4598 | trigger_name, (int) trigger_owner, | |
4599 | (int) lttng_credentials_get_uid(cmd_creds)); | |
b0880ae5 | 4600 | |
64eafdf6 JR |
4601 | /* |
4602 | * Validate the trigger credentials against the command credentials. | |
4603 | * Only the root user can register a trigger with non-matching | |
4604 | * credentials. | |
4605 | */ | |
4606 | if (!lttng_credentials_is_equal_uid( | |
4607 | lttng_trigger_get_credentials(trigger), | |
746e08d7 JG |
4608 | cmd_creds)) { |
4609 | if (lttng_credentials_get_uid(cmd_creds) != 0) { | |
70670472 JR |
4610 | ERR("Trigger credentials do not match the command credentials: trigger name = '%s', trigger owner uid = %d, command creds uid = %d", |
4611 | trigger_name, (int) trigger_owner, | |
4612 | (int) lttng_credentials_get_uid(cmd_creds)); | |
4613 | ret_code = LTTNG_ERR_INVALID_TRIGGER; | |
64eafdf6 JR |
4614 | goto end; |
4615 | } | |
4616 | } | |
3da864a9 | 4617 | |
58daac01 JR |
4618 | /* |
4619 | * The bytecode generation also serves as a validation step for the | |
4620 | * bytecode expressions. | |
4621 | */ | |
70670472 JR |
4622 | ret_code = lttng_trigger_generate_bytecode(trigger, cmd_creds); |
4623 | if (ret_code != LTTNG_OK) { | |
4624 | ERR("Failed to generate bytecode of trigger: trigger name = '%s', trigger owner uid = %d, error code = %d", | |
4625 | trigger_name, (int) trigger_owner, ret_code); | |
58daac01 JR |
4626 | goto end; |
4627 | } | |
4628 | ||
242388e4 JR |
4629 | /* |
4630 | * A reference to the trigger is acquired by the notification thread. | |
4631 | * It is safe to return the same trigger to the caller since it the | |
4632 | * other user holds a reference. | |
4633 | * | |
4634 | * The trigger is modified during the execution of the | |
4635 | * "register trigger" command. However, by the time the command returns, | |
4636 | * it is safe to use without any locking as its properties are | |
4637 | * immutable. | |
4638 | */ | |
0efb2ad7 JG |
4639 | ret_code = notification_thread_command_register_trigger( |
4640 | notification_thread, trigger, is_trigger_anonymous); | |
70670472 | 4641 | if (ret_code != LTTNG_OK) { |
ce0b1d61 | 4642 | DBG("Failed to register trigger to notification thread: trigger name = '%s', trigger owner uid = %d, error code = %d", |
70670472 | 4643 | trigger_name, (int) trigger_owner, ret_code); |
44760c20 | 4644 | goto end; |
70670472 JR |
4645 | } |
4646 | ||
ce0b1d61 JG |
4647 | trigger_status = lttng_trigger_get_name(trigger, &trigger_name); |
4648 | trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ? | |
0efb2ad7 | 4649 | trigger_name : "(anonymous)"; |
ce0b1d61 | 4650 | |
70670472 JR |
4651 | /* |
4652 | * Synchronize tracers if the trigger adds an event notifier. | |
4653 | */ | |
989a0844 FD |
4654 | if (lttng_trigger_needs_tracer_notifier(trigger)) { |
4655 | ret_code = synchronize_tracer_notifier_register(notification_thread, | |
4656 | trigger, cmd_creds); | |
4657 | if (ret_code != LTTNG_OK) { | |
4658 | ERR("Error registering tracer notifier: %s", | |
4659 | lttng_strerror(-ret_code)); | |
4660 | goto end; | |
70670472 JR |
4661 | } |
4662 | } | |
4663 | ||
746e08d7 JG |
4664 | /* |
4665 | * Return an updated trigger to the client. | |
4666 | * | |
4667 | * Since a modified version of the same trigger is returned, acquire a | |
4668 | * reference to the trigger so the caller doesn't have to care if those | |
4669 | * are distinct instances or not. | |
4670 | */ | |
39b95a70 JG |
4671 | if (ret_code == LTTNG_OK) { |
4672 | lttng_trigger_get(trigger); | |
4673 | *return_trigger = trigger; | |
4674 | /* Ownership of trigger was transferred to caller. */ | |
4675 | trigger = NULL; | |
4676 | } | |
b0880ae5 | 4677 | end: |
70670472 | 4678 | return ret_code; |
989a0844 FD |
4679 | } |
4680 | ||
4681 | static | |
4682 | enum lttng_error_code synchronize_tracer_notifier_unregister( | |
4683 | const struct lttng_trigger *trigger) | |
4684 | { | |
4685 | enum lttng_error_code ret_code; | |
4686 | const struct lttng_condition *condition = | |
4687 | lttng_trigger_get_const_condition(trigger); | |
4688 | const enum lttng_domain_type trigger_domain = | |
4689 | lttng_trigger_get_underlying_domain_type_restriction( | |
4690 | trigger); | |
4691 | ||
a0377dfe FD |
4692 | LTTNG_ASSERT(condition); |
4693 | LTTNG_ASSERT(lttng_condition_get_type(condition) == | |
8dbb86b8 | 4694 | LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES); |
989a0844 FD |
4695 | |
4696 | session_lock_list(); | |
4697 | switch (trigger_domain) { | |
4698 | case LTTNG_DOMAIN_KERNEL: | |
4699 | ret_code = kernel_unregister_event_notifier(trigger); | |
e689039f JG |
4700 | if (ret_code != LTTNG_OK) { |
4701 | goto end_unlock_session_list; | |
4702 | } | |
4703 | ||
989a0844 FD |
4704 | break; |
4705 | case LTTNG_DOMAIN_UST: | |
4706 | ust_app_global_update_all_event_notifier_rules(); | |
4707 | break; | |
4708 | case LTTNG_DOMAIN_JUL: | |
4709 | case LTTNG_DOMAIN_LOG4J: | |
4710 | case LTTNG_DOMAIN_PYTHON: | |
4711 | { | |
4712 | /* Agent domains. */ | |
4713 | struct agent *agt = agent_find_by_event_notifier_domain( | |
4714 | trigger_domain); | |
4715 | ||
566190c4 JG |
4716 | /* |
4717 | * This trigger was never registered in the first place. Calling | |
4718 | * this function under those circumstances is an internal error. | |
4719 | */ | |
a0377dfe | 4720 | LTTNG_ASSERT(agt); |
7966af57 | 4721 | ret_code = (lttng_error_code) trigger_agent_disable(trigger, agt); |
989a0844 FD |
4722 | if (ret_code != LTTNG_OK) { |
4723 | goto end_unlock_session_list; | |
4724 | } | |
4725 | ||
4726 | break; | |
4727 | } | |
4728 | case LTTNG_DOMAIN_NONE: | |
4729 | default: | |
4730 | abort(); | |
4731 | } | |
4732 | ||
4733 | ret_code = LTTNG_OK; | |
4734 | ||
9b7cbebd JG |
4735 | end_unlock_session_list: |
4736 | session_unlock_list(); | |
4737 | return ret_code; | |
b0880ae5 JG |
4738 | } |
4739 | ||
70670472 | 4740 | enum lttng_error_code cmd_unregister_trigger(const struct lttng_credentials *cmd_creds, |
746e08d7 | 4741 | const struct lttng_trigger *trigger, |
b0880ae5 JG |
4742 | struct notification_thread_handle *notification_thread) |
4743 | { | |
70670472 | 4744 | enum lttng_error_code ret_code; |
70670472 JR |
4745 | const char *trigger_name; |
4746 | uid_t trigger_owner; | |
4747 | enum lttng_trigger_status trigger_status; | |
5c5373c3 | 4748 | struct lttng_trigger *sessiond_trigger = NULL; |
70670472 JR |
4749 | |
4750 | trigger_status = lttng_trigger_get_name(trigger, &trigger_name); | |
0efb2ad7 | 4751 | trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ? trigger_name : "(anonymous)"; |
989a0844 | 4752 | trigger_status = lttng_trigger_get_owner_uid(trigger, &trigger_owner); |
a0377dfe | 4753 | LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK); |
70670472 JR |
4754 | |
4755 | DBG("Running unregister trigger command: trigger name = '%s', trigger owner uid = %d, command creds uid = %d", | |
4756 | trigger_name, (int) trigger_owner, | |
4757 | (int) lttng_credentials_get_uid(cmd_creds)); | |
b0880ae5 | 4758 | |
64eafdf6 JR |
4759 | /* |
4760 | * Validate the trigger credentials against the command credentials. | |
4761 | * Only the root user can unregister a trigger with non-matching | |
4762 | * credentials. | |
4763 | */ | |
4764 | if (!lttng_credentials_is_equal_uid( | |
4765 | lttng_trigger_get_credentials(trigger), | |
746e08d7 JG |
4766 | cmd_creds)) { |
4767 | if (lttng_credentials_get_uid(cmd_creds) != 0) { | |
70670472 JR |
4768 | ERR("Trigger credentials do not match the command credentials: trigger name = '%s', trigger owner uid = %d, command creds uid = %d", |
4769 | trigger_name, (int) trigger_owner, | |
4770 | (int) lttng_credentials_get_uid(cmd_creds)); | |
4771 | ret_code = LTTNG_ERR_INVALID_TRIGGER; | |
64eafdf6 JR |
4772 | goto end; |
4773 | } | |
4774 | } | |
3da864a9 | 4775 | |
5c5373c3 JR |
4776 | /* Fetch the sessiond side trigger object. */ |
4777 | ret_code = notification_thread_command_get_trigger( | |
4778 | notification_thread, trigger, &sessiond_trigger); | |
4779 | if (ret_code != LTTNG_OK) { | |
4780 | DBG("Failed to get trigger from notification thread during unregister: trigger name = '%s', trigger owner uid = %d, error code = %d", | |
4781 | trigger_name, (int) trigger_owner, ret_code); | |
4782 | goto end; | |
4783 | } | |
4784 | ||
a0377dfe | 4785 | LTTNG_ASSERT(sessiond_trigger); |
5c5373c3 JR |
4786 | |
4787 | /* | |
4788 | * From this point on, no matter what, consider the trigger | |
4789 | * unregistered. | |
4790 | * | |
4791 | * We set the unregistered state of the sessiond side trigger object in | |
4792 | * the client thread since we want to minimize the possibility of the | |
4793 | * notification thread being stalled due to a long execution of an | |
4794 | * action that required the trigger lock. | |
4795 | */ | |
4796 | lttng_trigger_set_as_unregistered(sessiond_trigger); | |
4797 | ||
70670472 JR |
4798 | ret_code = notification_thread_command_unregister_trigger(notification_thread, |
4799 | trigger); | |
4800 | if (ret_code != LTTNG_OK) { | |
ce0b1d61 | 4801 | DBG("Failed to unregister trigger from notification thread: trigger name = '%s', trigger owner uid = %d, error code = %d", |
70670472 | 4802 | trigger_name, (int) trigger_owner, ret_code); |
13839b27 | 4803 | goto end; |
70670472 JR |
4804 | } |
4805 | ||
4806 | /* | |
4807 | * Synchronize tracers if the trigger removes an event notifier. | |
44760c20 JR |
4808 | * Do this even if the trigger unregistration failed to at least stop |
4809 | * the tracers from producing notifications associated with this | |
4810 | * event notifier. | |
70670472 | 4811 | */ |
989a0844 FD |
4812 | if (lttng_trigger_needs_tracer_notifier(trigger)) { |
4813 | ret_code = synchronize_tracer_notifier_unregister(trigger); | |
4814 | if (ret_code != LTTNG_OK) { | |
4815 | ERR("Error unregistering trigger to tracer."); | |
4816 | goto end; | |
70670472 | 4817 | } |
9b7cbebd | 4818 | |
70670472 JR |
4819 | } |
4820 | ||
b0880ae5 | 4821 | end: |
5c5373c3 | 4822 | lttng_trigger_put(sessiond_trigger); |
70670472 | 4823 | return ret_code; |
989a0844 | 4824 | } |
b0880ae5 | 4825 | |
ddd915a3 | 4826 | enum lttng_error_code cmd_list_triggers(struct command_ctx *cmd_ctx, |
fbc9f37d JR |
4827 | struct notification_thread_handle *notification_thread, |
4828 | struct lttng_triggers **return_triggers) | |
4829 | { | |
f2bda80e | 4830 | int ret; |
fbc9f37d JR |
4831 | enum lttng_error_code ret_code; |
4832 | struct lttng_triggers *triggers = NULL; | |
4833 | ||
4834 | /* Get the set of triggers from the notification thread. */ | |
4835 | ret_code = notification_thread_command_list_triggers( | |
4836 | notification_thread, cmd_ctx->creds.uid, &triggers); | |
4837 | if (ret_code != LTTNG_OK) { | |
fbc9f37d JR |
4838 | goto end; |
4839 | } | |
4840 | ||
f2bda80e JG |
4841 | ret = lttng_triggers_remove_hidden_triggers(triggers); |
4842 | if (ret) { | |
4843 | ret_code = LTTNG_ERR_UNK; | |
4844 | goto end; | |
4845 | } | |
4846 | ||
fbc9f37d JR |
4847 | *return_triggers = triggers; |
4848 | triggers = NULL; | |
ddd915a3 | 4849 | ret_code = LTTNG_OK; |
fbc9f37d JR |
4850 | end: |
4851 | lttng_triggers_destroy(triggers); | |
ddd915a3 | 4852 | return ret_code; |
fbc9f37d | 4853 | } |
588c4b0d JG |
4854 | |
4855 | enum lttng_error_code cmd_execute_error_query(const struct lttng_credentials *cmd_creds, | |
4856 | const struct lttng_error_query *query, | |
4857 | struct lttng_error_query_results **_results, | |
4858 | struct notification_thread_handle *notification_thread) | |
4859 | { | |
4860 | enum lttng_error_code ret_code; | |
4861 | const struct lttng_trigger *query_target_trigger; | |
63dd3d7b | 4862 | const struct lttng_action *query_target_action = NULL; |
588c4b0d JG |
4863 | struct lttng_trigger *matching_trigger = NULL; |
4864 | const char *trigger_name; | |
4865 | uid_t trigger_owner; | |
4866 | enum lttng_trigger_status trigger_status; | |
4867 | struct lttng_error_query_results *results = NULL; | |
4868 | ||
4869 | switch (lttng_error_query_get_target_type(query)) { | |
4870 | case LTTNG_ERROR_QUERY_TARGET_TYPE_TRIGGER: | |
4871 | query_target_trigger = lttng_error_query_trigger_borrow_target(query); | |
4872 | break; | |
63dd3d7b JG |
4873 | case LTTNG_ERROR_QUERY_TARGET_TYPE_CONDITION: |
4874 | query_target_trigger = | |
4875 | lttng_error_query_condition_borrow_target(query); | |
4876 | break; | |
588c4b0d JG |
4877 | case LTTNG_ERROR_QUERY_TARGET_TYPE_ACTION: |
4878 | query_target_trigger = lttng_error_query_action_borrow_trigger_target( | |
4879 | query); | |
4880 | break; | |
4881 | default: | |
4882 | abort(); | |
4883 | } | |
4884 | ||
a0377dfe | 4885 | LTTNG_ASSERT(query_target_trigger); |
588c4b0d JG |
4886 | |
4887 | ret_code = notification_thread_command_get_trigger(notification_thread, | |
4888 | query_target_trigger, &matching_trigger); | |
4889 | if (ret_code != LTTNG_OK) { | |
4890 | goto end; | |
4891 | } | |
4892 | ||
4893 | /* No longer needed. */ | |
4894 | query_target_trigger = NULL; | |
4895 | ||
4896 | if (lttng_error_query_get_target_type(query) == | |
4897 | LTTNG_ERROR_QUERY_TARGET_TYPE_ACTION) { | |
4898 | /* Get the sessiond-side version of the target action. */ | |
4899 | query_target_action = | |
4900 | lttng_error_query_action_borrow_action_target( | |
4901 | query, matching_trigger); | |
4902 | } | |
4903 | ||
4904 | trigger_status = lttng_trigger_get_name(matching_trigger, &trigger_name); | |
4905 | trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ? | |
0efb2ad7 | 4906 | trigger_name : "(anonymous)"; |
588c4b0d JG |
4907 | trigger_status = lttng_trigger_get_owner_uid(matching_trigger, |
4908 | &trigger_owner); | |
a0377dfe | 4909 | LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK); |
588c4b0d JG |
4910 | |
4911 | results = lttng_error_query_results_create(); | |
4912 | if (!results) { | |
4913 | ret_code = LTTNG_ERR_NOMEM; | |
4914 | goto end; | |
4915 | } | |
4916 | ||
4917 | DBG("Running \"execute error query\" command: trigger name = '%s', trigger owner uid = %d, command creds uid = %d", | |
4918 | trigger_name, (int) trigger_owner, | |
4919 | (int) lttng_credentials_get_uid(cmd_creds)); | |
4920 | ||
4921 | /* | |
4922 | * Validate the trigger credentials against the command credentials. | |
4923 | * Only the root user can target a trigger with non-matching | |
4924 | * credentials. | |
4925 | */ | |
4926 | if (!lttng_credentials_is_equal_uid( | |
4927 | lttng_trigger_get_credentials(matching_trigger), | |
4928 | cmd_creds)) { | |
4929 | if (lttng_credentials_get_uid(cmd_creds) != 0) { | |
4930 | ERR("Trigger credentials do not match the command credentials: trigger name = '%s', trigger owner uid = %d, command creds uid = %d", | |
4931 | trigger_name, (int) trigger_owner, | |
4932 | (int) lttng_credentials_get_uid(cmd_creds)); | |
4933 | ret_code = LTTNG_ERR_INVALID_TRIGGER; | |
4934 | goto end; | |
4935 | } | |
4936 | } | |
4937 | ||
4938 | switch (lttng_error_query_get_target_type(query)) { | |
4939 | case LTTNG_ERROR_QUERY_TARGET_TYPE_TRIGGER: | |
4940 | trigger_status = lttng_trigger_add_error_results( | |
4941 | matching_trigger, results); | |
4942 | ||
4943 | switch (trigger_status) { | |
4944 | case LTTNG_TRIGGER_STATUS_OK: | |
4945 | break; | |
4946 | default: | |
4947 | ret_code = LTTNG_ERR_UNK; | |
4948 | goto end; | |
4949 | } | |
4950 | ||
4951 | break; | |
63dd3d7b JG |
4952 | case LTTNG_ERROR_QUERY_TARGET_TYPE_CONDITION: |
4953 | { | |
4954 | trigger_status = lttng_trigger_condition_add_error_results( | |
4955 | matching_trigger, results); | |
4956 | ||
4957 | switch (trigger_status) { | |
4958 | case LTTNG_TRIGGER_STATUS_OK: | |
4959 | break; | |
4960 | default: | |
4961 | ret_code = LTTNG_ERR_UNK; | |
4962 | goto end; | |
4963 | } | |
4964 | ||
4965 | break; | |
4966 | } | |
588c4b0d JG |
4967 | case LTTNG_ERROR_QUERY_TARGET_TYPE_ACTION: |
4968 | { | |
4969 | const enum lttng_action_status action_status = | |
4970 | lttng_action_add_error_query_results( | |
4971 | query_target_action, results); | |
4972 | ||
4973 | switch (action_status) { | |
4974 | case LTTNG_ACTION_STATUS_OK: | |
4975 | break; | |
4976 | default: | |
4977 | ret_code = LTTNG_ERR_UNK; | |
4978 | goto end; | |
4979 | } | |
4980 | ||
4981 | break; | |
4982 | } | |
4983 | default: | |
ef4cf1d2 | 4984 | abort(); |
588c4b0d JG |
4985 | break; |
4986 | } | |
4987 | ||
4988 | *_results = results; | |
4989 | results = NULL; | |
4990 | ret_code = LTTNG_OK; | |
4991 | end: | |
4992 | lttng_trigger_put(matching_trigger); | |
4993 | lttng_error_query_results_destroy(results); | |
4994 | return ret_code; | |
4995 | } | |
4996 | ||
6dc3064a DG |
4997 | /* |
4998 | * Send relayd sockets from snapshot output to consumer. Ignore request if the | |
4999 | * snapshot output is *not* set with a remote destination. | |
5000 | * | |
9a654598 | 5001 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a | 5002 | */ |
9a654598 | 5003 | static enum lttng_error_code set_relayd_for_snapshot( |
348a81dc | 5004 | struct consumer_output *output, |
fb9a95c4 | 5005 | const struct ltt_session *session) |
6dc3064a | 5006 | { |
9a654598 | 5007 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
5008 | struct lttng_ht_iter iter; |
5009 | struct consumer_socket *socket; | |
1e791a74 | 5010 | LTTNG_OPTIONAL(uint64_t) current_chunk_id = {}; |
6fa5fe7c | 5011 | const char *base_path; |
6dc3064a | 5012 | |
a0377dfe FD |
5013 | LTTNG_ASSERT(output); |
5014 | LTTNG_ASSERT(session); | |
6dc3064a DG |
5015 | |
5016 | DBG2("Set relayd object from snapshot output"); | |
5017 | ||
1e791a74 | 5018 | if (session->current_trace_chunk) { |
348a81dc JG |
5019 | enum lttng_trace_chunk_status chunk_status = |
5020 | lttng_trace_chunk_get_id( | |
5021 | session->current_trace_chunk, | |
5022 | ¤t_chunk_id.value); | |
1e791a74 | 5023 | |
348a81dc | 5024 | if (chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK) { |
1e791a74 JG |
5025 | current_chunk_id.is_set = true; |
5026 | } else { | |
5027 | ERR("Failed to get current trace chunk id"); | |
5028 | status = LTTNG_ERR_UNK; | |
5029 | goto error; | |
5030 | } | |
5031 | } | |
5032 | ||
6dc3064a | 5033 | /* Ignore if snapshot consumer output is not network. */ |
348a81dc | 5034 | if (output->type != CONSUMER_DST_NET) { |
6dc3064a DG |
5035 | goto error; |
5036 | } | |
5037 | ||
6fa5fe7c MD |
5038 | /* |
5039 | * The snapshot record URI base path overrides the session | |
5040 | * base path. | |
5041 | */ | |
5042 | if (output->dst.net.control.subdir[0] != '\0') { | |
5043 | base_path = output->dst.net.control.subdir; | |
5044 | } else { | |
5045 | base_path = session->base_path; | |
5046 | } | |
5047 | ||
6dc3064a DG |
5048 | /* |
5049 | * For each consumer socket, create and send the relayd object of the | |
5050 | * snapshot output. | |
5051 | */ | |
5052 | rcu_read_lock(); | |
348a81dc | 5053 | cds_lfht_for_each_entry(output->socks->ht, &iter.iter, |
5eecee74 | 5054 | socket, node.node) { |
ecd0f96d | 5055 | pthread_mutex_lock(socket->lock); |
f46376a1 | 5056 | status = send_consumer_relayd_sockets(session->id, |
348a81dc | 5057 | output, socket, |
d3e2ba59 | 5058 | session->name, session->hostname, |
6fa5fe7c | 5059 | base_path, |
1e791a74 | 5060 | session->live_timer, |
db1da059 | 5061 | current_chunk_id.is_set ? ¤t_chunk_id.value : NULL, |
46ef2188 MD |
5062 | session->creation_time, |
5063 | session->name_contains_creation_time); | |
ecd0f96d | 5064 | pthread_mutex_unlock(socket->lock); |
9a654598 | 5065 | if (status != LTTNG_OK) { |
6dc3064a DG |
5066 | rcu_read_unlock(); |
5067 | goto error; | |
5068 | } | |
5069 | } | |
5070 | rcu_read_unlock(); | |
5071 | ||
5072 | error: | |
9a654598 | 5073 | return status; |
6dc3064a DG |
5074 | } |
5075 | ||
5076 | /* | |
5077 | * Record a kernel snapshot. | |
5078 | * | |
fac41e72 | 5079 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a | 5080 | */ |
fb9a95c4 JG |
5081 | static enum lttng_error_code record_kernel_snapshot( |
5082 | struct ltt_kernel_session *ksess, | |
348a81dc | 5083 | const struct consumer_output *output, |
fb9a95c4 | 5084 | const struct ltt_session *session, |
f46376a1 | 5085 | uint64_t nb_packets_per_stream) |
6dc3064a | 5086 | { |
9a654598 | 5087 | enum lttng_error_code status; |
6dc3064a | 5088 | |
a0377dfe FD |
5089 | LTTNG_ASSERT(ksess); |
5090 | LTTNG_ASSERT(output); | |
5091 | LTTNG_ASSERT(session); | |
6dc3064a | 5092 | |
348a81dc | 5093 | status = kernel_snapshot_record( |
f46376a1 | 5094 | ksess, output, nb_packets_per_stream); |
9a654598 | 5095 | return status; |
6dc3064a DG |
5096 | } |
5097 | ||
5098 | /* | |
5099 | * Record a UST snapshot. | |
5100 | * | |
9a654598 | 5101 | * Returns LTTNG_OK on success or a LTTNG_ERR error code. |
6dc3064a | 5102 | */ |
9a654598 | 5103 | static enum lttng_error_code record_ust_snapshot(struct ltt_ust_session *usess, |
348a81dc JG |
5104 | const struct consumer_output *output, |
5105 | const struct ltt_session *session, | |
f46376a1 | 5106 | uint64_t nb_packets_per_stream) |
6dc3064a | 5107 | { |
9a654598 | 5108 | enum lttng_error_code status; |
6dc3064a | 5109 | |
a0377dfe FD |
5110 | LTTNG_ASSERT(usess); |
5111 | LTTNG_ASSERT(output); | |
5112 | LTTNG_ASSERT(session); | |
6dc3064a | 5113 | |
348a81dc | 5114 | status = ust_app_snapshot_record( |
f46376a1 | 5115 | usess, output, nb_packets_per_stream); |
9a654598 | 5116 | return status; |
6dc3064a DG |
5117 | } |
5118 | ||
d07ceecd | 5119 | static |
fb9a95c4 JG |
5120 | uint64_t get_session_size_one_more_packet_per_stream( |
5121 | const struct ltt_session *session, uint64_t cur_nr_packets) | |
68808f4e | 5122 | { |
d07ceecd | 5123 | uint64_t tot_size = 0; |
68808f4e DG |
5124 | |
5125 | if (session->kernel_session) { | |
5126 | struct ltt_kernel_channel *chan; | |
fb9a95c4 JG |
5127 | const struct ltt_kernel_session *ksess = |
5128 | session->kernel_session; | |
68808f4e | 5129 | |
68808f4e | 5130 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
d07ceecd MD |
5131 | if (cur_nr_packets >= chan->channel->attr.num_subbuf) { |
5132 | /* | |
5133 | * Don't take channel into account if we | |
5134 | * already grab all its packets. | |
5135 | */ | |
5136 | continue; | |
68808f4e | 5137 | } |
d07ceecd MD |
5138 | tot_size += chan->channel->attr.subbuf_size |
5139 | * chan->stream_count; | |
68808f4e DG |
5140 | } |
5141 | } | |
5142 | ||
5143 | if (session->ust_session) { | |
fb9a95c4 | 5144 | const struct ltt_ust_session *usess = session->ust_session; |
68808f4e | 5145 | |
d07ceecd MD |
5146 | tot_size += ust_app_get_size_one_more_packet_per_stream(usess, |
5147 | cur_nr_packets); | |
68808f4e DG |
5148 | } |
5149 | ||
d07ceecd | 5150 | return tot_size; |
68808f4e DG |
5151 | } |
5152 | ||
5c786ded | 5153 | /* |
d07ceecd MD |
5154 | * Calculate the number of packets we can grab from each stream that |
5155 | * fits within the overall snapshot max size. | |
5156 | * | |
5157 | * Returns -1 on error, 0 means infinite number of packets, else > 0 is | |
5158 | * the number of packets per stream. | |
5159 | * | |
5160 | * TODO: this approach is not perfect: we consider the worse case | |
5161 | * (packet filling the sub-buffers) as an upper bound, but we could do | |
5162 | * better if we do this calculation while we actually grab the packet | |
5163 | * content: we would know how much padding we don't actually store into | |
5164 | * the file. | |
5165 | * | |
5166 | * This algorithm is currently bounded by the number of packets per | |
5167 | * stream. | |
5168 | * | |
5169 | * Since we call this algorithm before actually grabbing the data, it's | |
5170 | * an approximation: for instance, applications could appear/disappear | |
5171 | * in between this call and actually grabbing data. | |
5c786ded | 5172 | */ |
d07ceecd | 5173 | static |
fb9a95c4 JG |
5174 | int64_t get_session_nb_packets_per_stream(const struct ltt_session *session, |
5175 | uint64_t max_size) | |
5c786ded | 5176 | { |
d07ceecd MD |
5177 | int64_t size_left; |
5178 | uint64_t cur_nb_packets = 0; | |
5c786ded | 5179 | |
d07ceecd MD |
5180 | if (!max_size) { |
5181 | return 0; /* Infinite */ | |
5c786ded JD |
5182 | } |
5183 | ||
d07ceecd MD |
5184 | size_left = max_size; |
5185 | for (;;) { | |
5186 | uint64_t one_more_packet_tot_size; | |
5c786ded | 5187 | |
fb9a95c4 JG |
5188 | one_more_packet_tot_size = get_session_size_one_more_packet_per_stream( |
5189 | session, cur_nb_packets); | |
d07ceecd MD |
5190 | if (!one_more_packet_tot_size) { |
5191 | /* We are already grabbing all packets. */ | |
5192 | break; | |
5193 | } | |
5194 | size_left -= one_more_packet_tot_size; | |
5195 | if (size_left < 0) { | |
5196 | break; | |
5197 | } | |
5198 | cur_nb_packets++; | |
5c786ded | 5199 | } |
aecf2da5 | 5200 | if (!cur_nb_packets && size_left != max_size) { |
d07ceecd MD |
5201 | /* Not enough room to grab one packet of each stream, error. */ |
5202 | return -1; | |
5203 | } | |
5204 | return cur_nb_packets; | |
5c786ded JD |
5205 | } |
5206 | ||
fb9a95c4 | 5207 | static |
d2956687 | 5208 | enum lttng_error_code snapshot_record(struct ltt_session *session, |
f46376a1 | 5209 | const struct snapshot_output *snapshot_output) |
fb9a95c4 JG |
5210 | { |
5211 | int64_t nb_packets_per_stream; | |
d2956687 | 5212 | char snapshot_chunk_name[LTTNG_NAME_MAX]; |
348a81dc JG |
5213 | int ret; |
5214 | enum lttng_error_code ret_code = LTTNG_OK; | |
d2956687 | 5215 | struct lttng_trace_chunk *snapshot_trace_chunk; |
348a81dc JG |
5216 | struct consumer_output *original_ust_consumer_output = NULL; |
5217 | struct consumer_output *original_kernel_consumer_output = NULL; | |
5218 | struct consumer_output *snapshot_ust_consumer_output = NULL; | |
5219 | struct consumer_output *snapshot_kernel_consumer_output = NULL; | |
d2956687 | 5220 | |
348a81dc | 5221 | ret = snprintf(snapshot_chunk_name, sizeof(snapshot_chunk_name), |
d2956687 JG |
5222 | "%s-%s-%" PRIu64, |
5223 | snapshot_output->name, | |
5224 | snapshot_output->datetime, | |
5225 | snapshot_output->nb_snapshot); | |
348a81dc | 5226 | if (ret < 0 || ret >= sizeof(snapshot_chunk_name)) { |
d2956687 | 5227 | ERR("Failed to format snapshot name"); |
348a81dc JG |
5228 | ret_code = LTTNG_ERR_INVALID; |
5229 | goto error; | |
d2956687 JG |
5230 | } |
5231 | DBG("Recording snapshot \"%s\" for session \"%s\" with chunk name \"%s\"", | |
5232 | snapshot_output->name, session->name, | |
5233 | snapshot_chunk_name); | |
348a81dc JG |
5234 | if (!session->kernel_session && !session->ust_session) { |
5235 | ERR("Failed to record snapshot as no channels exist"); | |
5236 | ret_code = LTTNG_ERR_NO_CHANNEL; | |
5237 | goto error; | |
5238 | } | |
5239 | ||
5240 | if (session->kernel_session) { | |
5241 | original_kernel_consumer_output = | |
5242 | session->kernel_session->consumer; | |
5243 | snapshot_kernel_consumer_output = | |
5244 | consumer_copy_output(snapshot_output->consumer); | |
3b967712 MD |
5245 | strcpy(snapshot_kernel_consumer_output->chunk_path, |
5246 | snapshot_chunk_name); | |
bd666153 JR |
5247 | |
5248 | /* Copy the original domain subdir. */ | |
5249 | strcpy(snapshot_kernel_consumer_output->domain_subdir, | |
5250 | original_kernel_consumer_output->domain_subdir); | |
5251 | ||
348a81dc JG |
5252 | ret = consumer_copy_sockets(snapshot_kernel_consumer_output, |
5253 | original_kernel_consumer_output); | |
5254 | if (ret < 0) { | |
5255 | ERR("Failed to copy consumer sockets from snapshot output configuration"); | |
5256 | ret_code = LTTNG_ERR_NOMEM; | |
5257 | goto error; | |
5258 | } | |
5259 | ret_code = set_relayd_for_snapshot( | |
5260 | snapshot_kernel_consumer_output, session); | |
5261 | if (ret_code != LTTNG_OK) { | |
5262 | ERR("Failed to setup relay daemon for kernel tracer snapshot"); | |
5263 | goto error; | |
5264 | } | |
5265 | session->kernel_session->consumer = | |
5266 | snapshot_kernel_consumer_output; | |
5267 | } | |
5268 | if (session->ust_session) { | |
5269 | original_ust_consumer_output = session->ust_session->consumer; | |
5270 | snapshot_ust_consumer_output = | |
5271 | consumer_copy_output(snapshot_output->consumer); | |
3b967712 MD |
5272 | strcpy(snapshot_ust_consumer_output->chunk_path, |
5273 | snapshot_chunk_name); | |
bd666153 JR |
5274 | |
5275 | /* Copy the original domain subdir. */ | |
5276 | strcpy(snapshot_ust_consumer_output->domain_subdir, | |
5277 | original_ust_consumer_output->domain_subdir); | |
5278 | ||
348a81dc JG |
5279 | ret = consumer_copy_sockets(snapshot_ust_consumer_output, |
5280 | original_ust_consumer_output); | |
5281 | if (ret < 0) { | |
5282 | ERR("Failed to copy consumer sockets from snapshot output configuration"); | |
5283 | ret_code = LTTNG_ERR_NOMEM; | |
5284 | goto error; | |
5285 | } | |
5286 | ret_code = set_relayd_for_snapshot( | |
5287 | snapshot_ust_consumer_output, session); | |
5288 | if (ret_code != LTTNG_OK) { | |
5289 | ERR("Failed to setup relay daemon for userspace tracer snapshot"); | |
5290 | goto error; | |
5291 | } | |
5292 | session->ust_session->consumer = | |
5293 | snapshot_ust_consumer_output; | |
5294 | } | |
5295 | ||
d2956687 | 5296 | snapshot_trace_chunk = session_create_new_trace_chunk(session, |
348a81dc JG |
5297 | snapshot_kernel_consumer_output ?: |
5298 | snapshot_ust_consumer_output, | |
5299 | consumer_output_get_base_path( | |
5300 | snapshot_output->consumer), | |
d2956687 JG |
5301 | snapshot_chunk_name); |
5302 | if (!snapshot_trace_chunk) { | |
348a81dc JG |
5303 | ERR("Failed to create temporary trace chunk to record a snapshot of session \"%s\"", |
5304 | session->name); | |
5305 | ret_code = LTTNG_ERR_CREATE_DIR_FAIL; | |
5306 | goto error; | |
d2956687 | 5307 | } |
a0377dfe | 5308 | LTTNG_ASSERT(!session->current_trace_chunk); |
d2956687 JG |
5309 | ret = session_set_trace_chunk(session, snapshot_trace_chunk, NULL); |
5310 | lttng_trace_chunk_put(snapshot_trace_chunk); | |
5311 | snapshot_trace_chunk = NULL; | |
5312 | if (ret) { | |
348a81dc JG |
5313 | ERR("Failed to set temporary trace chunk to record a snapshot of session \"%s\"", |
5314 | session->name); | |
5315 | ret_code = LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER; | |
5316 | goto error; | |
d2956687 | 5317 | } |
fb9a95c4 JG |
5318 | |
5319 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
5320 | snapshot_output->max_size); | |
5321 | if (nb_packets_per_stream < 0) { | |
348a81dc | 5322 | ret_code = LTTNG_ERR_MAX_SIZE_INVALID; |
5151d412 | 5323 | goto error_close_trace_chunk; |
fb9a95c4 JG |
5324 | } |
5325 | ||
5326 | if (session->kernel_session) { | |
348a81dc JG |
5327 | ret_code = record_kernel_snapshot(session->kernel_session, |
5328 | snapshot_kernel_consumer_output, session, | |
f46376a1 | 5329 | nb_packets_per_stream); |
348a81dc | 5330 | if (ret_code != LTTNG_OK) { |
5151d412 | 5331 | goto error_close_trace_chunk; |
fb9a95c4 JG |
5332 | } |
5333 | } | |
5334 | ||
5335 | if (session->ust_session) { | |
348a81dc JG |
5336 | ret_code = record_ust_snapshot(session->ust_session, |
5337 | snapshot_ust_consumer_output, session, | |
f46376a1 | 5338 | nb_packets_per_stream); |
348a81dc | 5339 | if (ret_code != LTTNG_OK) { |
5151d412 | 5340 | goto error_close_trace_chunk; |
fb9a95c4 JG |
5341 | } |
5342 | } | |
d2956687 | 5343 | |
5151d412 | 5344 | error_close_trace_chunk: |
dbfee52c MD |
5345 | if (session_set_trace_chunk(session, NULL, &snapshot_trace_chunk)) { |
5346 | ERR("Failed to release the current trace chunk of session \"%s\"", | |
5347 | session->name); | |
5348 | ret_code = LTTNG_ERR_UNK; | |
5349 | } | |
5350 | ||
5351 | if (session_close_trace_chunk(session, snapshot_trace_chunk, | |
343defc2 | 5352 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION, NULL)) { |
d2956687 JG |
5353 | /* |
5354 | * Don't goto end; make sure the chunk is closed for the session | |
5355 | * to allow future snapshots. | |
5356 | */ | |
5357 | ERR("Failed to close snapshot trace chunk of session \"%s\"", | |
5358 | session->name); | |
348a81dc | 5359 | ret_code = LTTNG_ERR_CLOSE_TRACE_CHUNK_FAIL_CONSUMER; |
d2956687 | 5360 | } |
a49a9216 JG |
5361 | |
5362 | lttng_trace_chunk_put(snapshot_trace_chunk); | |
5363 | snapshot_trace_chunk = NULL; | |
348a81dc JG |
5364 | error: |
5365 | if (original_ust_consumer_output) { | |
5366 | session->ust_session->consumer = original_ust_consumer_output; | |
5367 | } | |
5368 | if (original_kernel_consumer_output) { | |
5369 | session->kernel_session->consumer = | |
5370 | original_kernel_consumer_output; | |
5371 | } | |
5372 | consumer_output_put(snapshot_ust_consumer_output); | |
5373 | consumer_output_put(snapshot_kernel_consumer_output); | |
5374 | return ret_code; | |
fb9a95c4 JG |
5375 | } |
5376 | ||
6dc3064a DG |
5377 | /* |
5378 | * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl. | |
5379 | * | |
5380 | * The wait parameter is ignored so this call always wait for the snapshot to | |
5381 | * complete before returning. | |
5382 | * | |
5383 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
5384 | */ | |
5385 | int cmd_snapshot_record(struct ltt_session *session, | |
f46376a1 MJ |
5386 | const struct lttng_snapshot_output *output, |
5387 | int wait __attribute__((unused))) | |
6dc3064a | 5388 | { |
9a654598 JG |
5389 | enum lttng_error_code cmd_ret = LTTNG_OK; |
5390 | int ret; | |
00e1dfc4 | 5391 | unsigned int snapshot_success = 0; |
10ba83fe | 5392 | char datetime[16]; |
2abe7969 | 5393 | struct snapshot_output *tmp_output = NULL; |
6dc3064a | 5394 | |
a0377dfe FD |
5395 | LTTNG_ASSERT(session); |
5396 | LTTNG_ASSERT(output); | |
6dc3064a DG |
5397 | |
5398 | DBG("Cmd snapshot record for session %s", session->name); | |
5399 | ||
10ba83fe JR |
5400 | /* Get the datetime for the snapshot output directory. */ |
5401 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", datetime, | |
5402 | sizeof(datetime)); | |
5403 | if (!ret) { | |
9a654598 | 5404 | cmd_ret = LTTNG_ERR_INVALID; |
10ba83fe JR |
5405 | goto error; |
5406 | } | |
5407 | ||
6dc3064a | 5408 | /* |
d3f14b8a MD |
5409 | * Permission denied to create an output if the session is not |
5410 | * set in no output mode. | |
6dc3064a DG |
5411 | */ |
5412 | if (session->output_traces) { | |
9a654598 | 5413 | cmd_ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
5414 | goto error; |
5415 | } | |
5416 | ||
5417 | /* The session needs to be started at least once. */ | |
8382cf6f | 5418 | if (!session->has_been_started) { |
9a654598 | 5419 | cmd_ret = LTTNG_ERR_START_SESSION_ONCE; |
6dc3064a DG |
5420 | goto error; |
5421 | } | |
5422 | ||
5423 | /* Use temporary output for the session. */ | |
ba45d9f0 | 5424 | if (*output->ctrl_url != '\0') { |
2abe7969 JG |
5425 | tmp_output = snapshot_output_alloc(); |
5426 | if (!tmp_output) { | |
5427 | cmd_ret = LTTNG_ERR_NOMEM; | |
5428 | goto error; | |
5429 | } | |
5430 | ||
b178f53e JG |
5431 | ret = snapshot_output_init(session, output->max_size, |
5432 | output->name, | |
5433 | output->ctrl_url, output->data_url, | |
5434 | session->consumer, | |
2abe7969 | 5435 | tmp_output, NULL); |
6dc3064a DG |
5436 | if (ret < 0) { |
5437 | if (ret == -ENOMEM) { | |
9a654598 | 5438 | cmd_ret = LTTNG_ERR_NOMEM; |
6dc3064a | 5439 | } else { |
9a654598 | 5440 | cmd_ret = LTTNG_ERR_INVALID; |
6dc3064a DG |
5441 | } |
5442 | goto error; | |
5443 | } | |
1bfe7328 | 5444 | /* Use the global session count for the temporary snapshot. */ |
2abe7969 | 5445 | tmp_output->nb_snapshot = session->snapshot.nb_snapshot; |
10ba83fe JR |
5446 | |
5447 | /* Use the global datetime */ | |
2abe7969 | 5448 | memcpy(tmp_output->datetime, datetime, sizeof(datetime)); |
f46376a1 | 5449 | cmd_ret = snapshot_record(session, tmp_output); |
fb9a95c4 | 5450 | if (cmd_ret != LTTNG_OK) { |
804c90a8 JR |
5451 | goto error; |
5452 | } | |
804c90a8 JR |
5453 | snapshot_success = 1; |
5454 | } else { | |
5455 | struct snapshot_output *sout; | |
5456 | struct lttng_ht_iter iter; | |
68808f4e | 5457 | |
804c90a8 JR |
5458 | rcu_read_lock(); |
5459 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
5460 | &iter.iter, sout, node.node) { | |
2abe7969 JG |
5461 | struct snapshot_output output_copy; |
5462 | ||
804c90a8 | 5463 | /* |
2abe7969 JG |
5464 | * Make a local copy of the output and override output |
5465 | * parameters with those provided as part of the | |
5466 | * command. | |
804c90a8 | 5467 | */ |
2abe7969 | 5468 | memcpy(&output_copy, sout, sizeof(output_copy)); |
1bfe7328 | 5469 | |
804c90a8 | 5470 | if (output->max_size != (uint64_t) -1ULL) { |
2abe7969 | 5471 | output_copy.max_size = output->max_size; |
6dc3064a | 5472 | } |
d07ceecd | 5473 | |
2abe7969 JG |
5474 | output_copy.nb_snapshot = session->snapshot.nb_snapshot; |
5475 | memcpy(output_copy.datetime, datetime, | |
5476 | sizeof(datetime)); | |
6dc3064a | 5477 | |
804c90a8 JR |
5478 | /* Use temporary name. */ |
5479 | if (*output->name != '\0') { | |
2abe7969 JG |
5480 | if (lttng_strncpy(output_copy.name, |
5481 | output->name, | |
5482 | sizeof(output_copy.name))) { | |
9a654598 | 5483 | cmd_ret = LTTNG_ERR_INVALID; |
cf3e357d MD |
5484 | rcu_read_unlock(); |
5485 | goto error; | |
5486 | } | |
804c90a8 | 5487 | } |
e1986656 | 5488 | |
f46376a1 | 5489 | cmd_ret = snapshot_record(session, &output_copy); |
fb9a95c4 JG |
5490 | if (cmd_ret != LTTNG_OK) { |
5491 | rcu_read_unlock(); | |
5492 | goto error; | |
6dc3064a | 5493 | } |
804c90a8 | 5494 | snapshot_success = 1; |
6dc3064a | 5495 | } |
804c90a8 | 5496 | rcu_read_unlock(); |
6dc3064a DG |
5497 | } |
5498 | ||
1bfe7328 DG |
5499 | if (snapshot_success) { |
5500 | session->snapshot.nb_snapshot++; | |
b67578cb | 5501 | } else { |
9a654598 | 5502 | cmd_ret = LTTNG_ERR_SNAPSHOT_FAIL; |
1bfe7328 DG |
5503 | } |
5504 | ||
6dc3064a | 5505 | error: |
2abe7969 JG |
5506 | if (tmp_output) { |
5507 | snapshot_output_destroy(tmp_output); | |
5508 | } | |
9a654598 | 5509 | return cmd_ret; |
6dc3064a DG |
5510 | } |
5511 | ||
d7ba1388 MD |
5512 | /* |
5513 | * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread. | |
5514 | */ | |
5515 | int cmd_set_session_shm_path(struct ltt_session *session, | |
5516 | const char *shm_path) | |
5517 | { | |
5518 | /* Safety net */ | |
a0377dfe | 5519 | LTTNG_ASSERT(session); |
d7ba1388 MD |
5520 | |
5521 | /* | |
5522 | * Can only set shm path before session is started. | |
5523 | */ | |
5524 | if (session->has_been_started) { | |
5525 | return LTTNG_ERR_SESSION_STARTED; | |
5526 | } | |
5527 | ||
5528 | strncpy(session->shm_path, shm_path, | |
5529 | sizeof(session->shm_path)); | |
5530 | session->shm_path[sizeof(session->shm_path) - 1] = '\0'; | |
5531 | ||
7e397c55 | 5532 | return LTTNG_OK; |
d7ba1388 MD |
5533 | } |
5534 | ||
5c408ad8 JD |
5535 | /* |
5536 | * Command LTTNG_ROTATE_SESSION from the lttng-ctl library. | |
5537 | * | |
5538 | * Ask the consumer to rotate the session output directory. | |
5539 | * The session lock must be held. | |
5540 | * | |
d5a1b7aa | 5541 | * Returns LTTNG_OK on success or else a negative LTTng error code. |
5c408ad8 JD |
5542 | */ |
5543 | int cmd_rotate_session(struct ltt_session *session, | |
7fdbed1c | 5544 | struct lttng_rotate_session_return *rotate_return, |
343defc2 MD |
5545 | bool quiet_rotation, |
5546 | enum lttng_trace_chunk_command_type command) | |
5c408ad8 JD |
5547 | { |
5548 | int ret; | |
d2956687 | 5549 | uint64_t ongoing_rotation_chunk_id; |
d5a1b7aa | 5550 | enum lttng_error_code cmd_ret = LTTNG_OK; |
d2956687 JG |
5551 | struct lttng_trace_chunk *chunk_being_archived = NULL; |
5552 | struct lttng_trace_chunk *new_trace_chunk = NULL; | |
5553 | enum lttng_trace_chunk_status chunk_status; | |
3156892b JG |
5554 | bool failed_to_rotate = false; |
5555 | enum lttng_error_code rotation_fail_code = LTTNG_OK; | |
5c408ad8 | 5556 | |
a0377dfe | 5557 | LTTNG_ASSERT(session); |
5c408ad8 JD |
5558 | |
5559 | if (!session->has_been_started) { | |
d5a1b7aa | 5560 | cmd_ret = LTTNG_ERR_START_SESSION_ONCE; |
d68c9a04 | 5561 | goto end; |
5c408ad8 JD |
5562 | } |
5563 | ||
d48d65e1 MD |
5564 | /* |
5565 | * Explicit rotation is not supported for live sessions. | |
5566 | * However, live sessions can perform a quiet rotation on | |
5567 | * destroy. | |
5568 | * Rotation is not supported for snapshot traces (no output). | |
5569 | */ | |
5570 | if ((!quiet_rotation && session->live_timer) || | |
5571 | !session->output_traces) { | |
d5a1b7aa | 5572 | cmd_ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE; |
d68c9a04 | 5573 | goto end; |
5c408ad8 JD |
5574 | } |
5575 | ||
d2956687 | 5576 | /* Unsupported feature in lttng-relayd before 2.11. */ |
070b6a86 | 5577 | if (!quiet_rotation && session->consumer->type == CONSUMER_DST_NET && |
5c408ad8 JD |
5578 | (session->consumer->relay_major_version == 2 && |
5579 | session->consumer->relay_minor_version < 11)) { | |
d5a1b7aa | 5580 | cmd_ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE_RELAY; |
d68c9a04 | 5581 | goto end; |
5c408ad8 JD |
5582 | } |
5583 | ||
a40a503f MD |
5584 | /* Unsupported feature in lttng-modules before 2.8 (lack of sequence number). */ |
5585 | if (session->kernel_session && !kernel_supports_ring_buffer_packet_sequence_number()) { | |
5586 | cmd_ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE_KERNEL; | |
5587 | goto end; | |
5588 | } | |
5589 | ||
92816cc3 | 5590 | if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) { |
92816cc3 JG |
5591 | DBG("Refusing to launch a rotation; a rotation is already in progress for session %s", |
5592 | session->name); | |
d5a1b7aa | 5593 | cmd_ret = LTTNG_ERR_ROTATION_PENDING; |
d68c9a04 | 5594 | goto end; |
5c408ad8 JD |
5595 | } |
5596 | ||
5597 | /* | |
5598 | * After a stop, we only allow one rotation to occur, the other ones are | |
5599 | * useless until a new start. | |
5600 | */ | |
5601 | if (session->rotated_after_last_stop) { | |
5602 | DBG("Session \"%s\" was already rotated after stop, refusing rotation", | |
5603 | session->name); | |
d5a1b7aa | 5604 | cmd_ret = LTTNG_ERR_ROTATION_MULTIPLE_AFTER_STOP; |
d68c9a04 | 5605 | goto end; |
5c408ad8 | 5606 | } |
b02f5986 MD |
5607 | |
5608 | /* | |
5609 | * After a stop followed by a clear, disallow following rotations a they would | |
5610 | * generate empty chunks. | |
5611 | */ | |
5612 | if (session->cleared_after_last_stop) { | |
5613 | DBG("Session \"%s\" was already cleared after stop, refusing rotation", | |
5614 | session->name); | |
5615 | cmd_ret = LTTNG_ERR_ROTATION_AFTER_STOP_CLEAR; | |
5616 | goto end; | |
5617 | } | |
5618 | ||
d2956687 | 5619 | if (session->active) { |
348a81dc | 5620 | new_trace_chunk = session_create_new_trace_chunk(session, NULL, |
d2956687 JG |
5621 | NULL, NULL); |
5622 | if (!new_trace_chunk) { | |
5623 | cmd_ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
5624 | goto error; | |
5c408ad8 | 5625 | } |
0e270a1e | 5626 | } |
2961f09e | 5627 | |
3156892b JG |
5628 | /* |
5629 | * The current trace chunk becomes the chunk being archived. | |
5630 | * | |
5631 | * After this point, "chunk_being_archived" must absolutely | |
5632 | * be closed on the consumer(s), otherwise it will never be | |
5633 | * cleaned-up, which will result in a leak. | |
5634 | */ | |
d2956687 JG |
5635 | ret = session_set_trace_chunk(session, new_trace_chunk, |
5636 | &chunk_being_archived); | |
5637 | if (ret) { | |
5638 | cmd_ret = LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER; | |
b178f53e JG |
5639 | goto error; |
5640 | } | |
5641 | ||
5c408ad8 | 5642 | if (session->kernel_session) { |
d5a1b7aa JG |
5643 | cmd_ret = kernel_rotate_session(session); |
5644 | if (cmd_ret != LTTNG_OK) { | |
3156892b JG |
5645 | failed_to_rotate = true; |
5646 | rotation_fail_code = cmd_ret; | |
5c408ad8 JD |
5647 | } |
5648 | } | |
5649 | if (session->ust_session) { | |
d5a1b7aa JG |
5650 | cmd_ret = ust_app_rotate_session(session); |
5651 | if (cmd_ret != LTTNG_OK) { | |
3156892b JG |
5652 | failed_to_rotate = true; |
5653 | rotation_fail_code = cmd_ret; | |
5c408ad8 | 5654 | } |
92816cc3 | 5655 | } |
17dd1232 | 5656 | |
3b61d9ee JG |
5657 | if (!session->active) { |
5658 | session->rotated_after_last_stop = true; | |
5659 | } | |
5660 | ||
5661 | if (!chunk_being_archived) { | |
5662 | DBG("Rotating session \"%s\" from a \"NULL\" trace chunk to a new trace chunk, skipping completion check", | |
5663 | session->name); | |
5664 | if (failed_to_rotate) { | |
5665 | cmd_ret = rotation_fail_code; | |
5666 | goto error; | |
5667 | } | |
5668 | cmd_ret = LTTNG_OK; | |
5669 | goto end; | |
5670 | } | |
5671 | ||
5672 | session->rotation_state = LTTNG_ROTATION_STATE_ONGOING; | |
5673 | chunk_status = lttng_trace_chunk_get_id(chunk_being_archived, | |
5674 | &ongoing_rotation_chunk_id); | |
a0377dfe | 5675 | LTTNG_ASSERT(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); |
3b61d9ee | 5676 | |
bbc4768c | 5677 | ret = session_close_trace_chunk(session, chunk_being_archived, |
343defc2 | 5678 | command, session->last_chunk_path); |
d2956687 JG |
5679 | if (ret) { |
5680 | cmd_ret = LTTNG_ERR_CLOSE_TRACE_CHUNK_FAIL_CONSUMER; | |
5681 | goto error; | |
5682 | } | |
5683 | ||
3156892b JG |
5684 | if (failed_to_rotate) { |
5685 | cmd_ret = rotation_fail_code; | |
5686 | goto error; | |
5687 | } | |
5688 | ||
7fdbed1c | 5689 | session->quiet_rotation = quiet_rotation; |
92816cc3 JG |
5690 | ret = timer_session_rotation_pending_check_start(session, |
5691 | DEFAULT_ROTATE_PENDING_TIMER); | |
5692 | if (ret) { | |
d5a1b7aa | 5693 | cmd_ret = LTTNG_ERR_UNK; |
2961f09e | 5694 | goto error; |
5c408ad8 JD |
5695 | } |
5696 | ||
5c408ad8 | 5697 | if (rotate_return) { |
d2956687 | 5698 | rotate_return->rotation_id = ongoing_rotation_chunk_id; |
5c408ad8 JD |
5699 | } |
5700 | ||
d2956687 JG |
5701 | session->chunk_being_archived = chunk_being_archived; |
5702 | chunk_being_archived = NULL; | |
7fdbed1c JG |
5703 | if (!quiet_rotation) { |
5704 | ret = notification_thread_command_session_rotation_ongoing( | |
412d7227 SM |
5705 | the_notification_thread_handle, session->name, |
5706 | session->uid, session->gid, | |
7fdbed1c JG |
5707 | ongoing_rotation_chunk_id); |
5708 | if (ret != LTTNG_OK) { | |
5709 | ERR("Failed to notify notification thread that a session rotation is ongoing for session %s", | |
5710 | session->name); | |
7966af57 | 5711 | cmd_ret = (lttng_error_code) ret; |
7fdbed1c | 5712 | } |
2961f09e JG |
5713 | } |
5714 | ||
92816cc3 | 5715 | DBG("Cmd rotate session %s, archive_id %" PRIu64 " sent", |
d2956687 | 5716 | session->name, ongoing_rotation_chunk_id); |
5c408ad8 | 5717 | end: |
d2956687 JG |
5718 | lttng_trace_chunk_put(new_trace_chunk); |
5719 | lttng_trace_chunk_put(chunk_being_archived); | |
d5a1b7aa | 5720 | ret = (cmd_ret == LTTNG_OK) ? cmd_ret : -((int) cmd_ret); |
5c408ad8 | 5721 | return ret; |
2961f09e | 5722 | error: |
2961f09e | 5723 | if (session_reset_rotation_state(session, |
d2956687 | 5724 | LTTNG_ROTATION_STATE_ERROR)) { |
2961f09e JG |
5725 | ERR("Failed to reset rotation state of session \"%s\"", |
5726 | session->name); | |
5727 | } | |
5728 | goto end; | |
5c408ad8 JD |
5729 | } |
5730 | ||
5731 | /* | |
d68c9a04 | 5732 | * Command LTTNG_ROTATION_GET_INFO from the lttng-ctl library. |
5c408ad8 JD |
5733 | * |
5734 | * Check if the session has finished its rotation. | |
5735 | * | |
d2956687 | 5736 | * Return LTTNG_OK on success or else an LTTNG_ERR code. |
5c408ad8 | 5737 | */ |
d68c9a04 JD |
5738 | int cmd_rotate_get_info(struct ltt_session *session, |
5739 | struct lttng_rotation_get_info_return *info_return, | |
5740 | uint64_t rotation_id) | |
5c408ad8 | 5741 | { |
d2956687 JG |
5742 | enum lttng_error_code cmd_ret = LTTNG_OK; |
5743 | enum lttng_rotation_state rotation_state; | |
5c408ad8 | 5744 | |
d68c9a04 | 5745 | DBG("Cmd rotate_get_info session %s, rotation id %" PRIu64, session->name, |
d2956687 | 5746 | session->most_recent_chunk_id.value); |
5c408ad8 | 5747 | |
d2956687 JG |
5748 | if (session->chunk_being_archived) { |
5749 | enum lttng_trace_chunk_status chunk_status; | |
5750 | uint64_t chunk_id; | |
5751 | ||
5752 | chunk_status = lttng_trace_chunk_get_id( | |
5753 | session->chunk_being_archived, | |
5754 | &chunk_id); | |
a0377dfe | 5755 | LTTNG_ASSERT(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); |
d2956687 JG |
5756 | |
5757 | rotation_state = rotation_id == chunk_id ? | |
5758 | LTTNG_ROTATION_STATE_ONGOING : | |
5759 | LTTNG_ROTATION_STATE_EXPIRED; | |
5760 | } else { | |
5761 | if (session->last_archived_chunk_id.is_set && | |
5762 | rotation_id != session->last_archived_chunk_id.value) { | |
5763 | rotation_state = LTTNG_ROTATION_STATE_EXPIRED; | |
5764 | } else { | |
5765 | rotation_state = session->rotation_state; | |
5766 | } | |
5c408ad8 JD |
5767 | } |
5768 | ||
d2956687 JG |
5769 | switch (rotation_state) { |
5770 | case LTTNG_ROTATION_STATE_NO_ROTATION: | |
83ed9e90 | 5771 | DBG("Reporting that no rotation has occurred within the lifetime of session \"%s\"", |
d2956687 JG |
5772 | session->name); |
5773 | goto end; | |
5774 | case LTTNG_ROTATION_STATE_EXPIRED: | |
5775 | DBG("Reporting that the rotation state of rotation id %" PRIu64 " of session \"%s\" has expired", | |
5776 | rotation_id, session->name); | |
5777 | break; | |
d68c9a04 | 5778 | case LTTNG_ROTATION_STATE_ONGOING: |
d2956687 | 5779 | DBG("Reporting that rotation id %" PRIu64 " of session \"%s\" is still pending", |
d68c9a04 JD |
5780 | rotation_id, session->name); |
5781 | break; | |
5782 | case LTTNG_ROTATION_STATE_COMPLETED: | |
dd73d57b | 5783 | { |
d2956687 JG |
5784 | int fmt_ret; |
5785 | char *chunk_path; | |
dd73d57b JG |
5786 | char *current_tracing_path_reply; |
5787 | size_t current_tracing_path_reply_len; | |
5788 | ||
d2956687 JG |
5789 | DBG("Reporting that rotation id %" PRIu64 " of session \"%s\" is completed", |
5790 | rotation_id, session->name); | |
5791 | ||
dd73d57b JG |
5792 | switch (session_get_consumer_destination_type(session)) { |
5793 | case CONSUMER_DST_LOCAL: | |
5794 | current_tracing_path_reply = | |
5795 | info_return->location.local.absolute_path; | |
5796 | current_tracing_path_reply_len = | |
5797 | sizeof(info_return->location.local.absolute_path); | |
5798 | info_return->location_type = | |
05f8afa9 | 5799 | (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_LOCAL; |
ecd1a12f MD |
5800 | fmt_ret = asprintf(&chunk_path, |
5801 | "%s/" DEFAULT_ARCHIVED_TRACE_CHUNKS_DIRECTORY "/%s", | |
5802 | session_get_base_path(session), | |
5803 | session->last_archived_chunk_name); | |
5804 | if (fmt_ret == -1) { | |
5805 | PERROR("Failed to format the path of the last archived trace chunk"); | |
5806 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; | |
5807 | cmd_ret = LTTNG_ERR_UNK; | |
5808 | goto end; | |
5809 | } | |
dd73d57b JG |
5810 | break; |
5811 | case CONSUMER_DST_NET: | |
09cfbe47 JG |
5812 | { |
5813 | uint16_t ctrl_port, data_port; | |
5814 | ||
dd73d57b JG |
5815 | current_tracing_path_reply = |
5816 | info_return->location.relay.relative_path; | |
5817 | current_tracing_path_reply_len = | |
5818 | sizeof(info_return->location.relay.relative_path); | |
5819 | /* Currently the only supported relay protocol. */ | |
5820 | info_return->location.relay.protocol = | |
05f8afa9 | 5821 | (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_RELAY_PROTOCOL_TYPE_TCP; |
dd73d57b | 5822 | |
d2956687 | 5823 | fmt_ret = lttng_strncpy(info_return->location.relay.host, |
dd73d57b JG |
5824 | session_get_net_consumer_hostname(session), |
5825 | sizeof(info_return->location.relay.host)); | |
d2956687 JG |
5826 | if (fmt_ret) { |
5827 | ERR("Failed to copy host name to rotate_get_info reply"); | |
dd73d57b | 5828 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; |
d2956687 | 5829 | cmd_ret = LTTNG_ERR_SET_URL; |
dd73d57b JG |
5830 | goto end; |
5831 | } | |
5832 | ||
09cfbe47 JG |
5833 | session_get_net_consumer_ports(session, &ctrl_port, &data_port); |
5834 | info_return->location.relay.ports.control = ctrl_port; | |
5835 | info_return->location.relay.ports.data = data_port; | |
dd73d57b | 5836 | info_return->location_type = |
05f8afa9 | 5837 | (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_RELAY; |
ecd1a12f MD |
5838 | chunk_path = strdup(session->last_chunk_path); |
5839 | if (!chunk_path) { | |
5840 | ERR("Failed to allocate the path of the last archived trace chunk"); | |
5841 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; | |
5842 | cmd_ret = LTTNG_ERR_UNK; | |
5843 | goto end; | |
5844 | } | |
dd73d57b | 5845 | break; |
09cfbe47 | 5846 | } |
dd73d57b JG |
5847 | default: |
5848 | abort(); | |
5849 | } | |
d2956687 JG |
5850 | |
5851 | fmt_ret = lttng_strncpy(current_tracing_path_reply, | |
5852 | chunk_path, current_tracing_path_reply_len); | |
5853 | free(chunk_path); | |
5854 | if (fmt_ret) { | |
5855 | ERR("Failed to copy path of the last archived trace chunk to rotate_get_info reply"); | |
d68c9a04 | 5856 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; |
d2956687 | 5857 | cmd_ret = LTTNG_ERR_UNK; |
5c408ad8 JD |
5858 | goto end; |
5859 | } | |
dd73d57b | 5860 | |
d68c9a04 | 5861 | break; |
dd73d57b | 5862 | } |
d68c9a04 | 5863 | case LTTNG_ROTATION_STATE_ERROR: |
d2956687 | 5864 | DBG("Reporting that an error occurred during rotation %" PRIu64 " of session \"%s\"", |
d68c9a04 JD |
5865 | rotation_id, session->name); |
5866 | break; | |
5867 | default: | |
5868 | abort(); | |
5c408ad8 JD |
5869 | } |
5870 | ||
d2956687 | 5871 | cmd_ret = LTTNG_OK; |
5c408ad8 | 5872 | end: |
d2956687 JG |
5873 | info_return->status = (int32_t) rotation_state; |
5874 | return cmd_ret; | |
5c408ad8 JD |
5875 | } |
5876 | ||
259c2674 JD |
5877 | /* |
5878 | * Command LTTNG_ROTATION_SET_SCHEDULE from the lttng-ctl library. | |
5879 | * | |
5880 | * Configure the automatic rotation parameters. | |
66ea93b1 JG |
5881 | * 'activate' to true means activate the rotation schedule type with 'new_value'. |
5882 | * 'activate' to false means deactivate the rotation schedule and validate that | |
5883 | * 'new_value' has the same value as the currently active value. | |
259c2674 | 5884 | * |
1136f41b | 5885 | * Return LTTNG_OK on success or else a positive LTTNG_ERR code. |
259c2674 JD |
5886 | */ |
5887 | int cmd_rotation_set_schedule(struct ltt_session *session, | |
66ea93b1 JG |
5888 | bool activate, enum lttng_rotation_schedule_type schedule_type, |
5889 | uint64_t new_value, | |
90936dcf | 5890 | struct notification_thread_handle *notification_thread_handle) |
259c2674 JD |
5891 | { |
5892 | int ret; | |
66ea93b1 | 5893 | uint64_t *parameter_value; |
259c2674 | 5894 | |
a0377dfe | 5895 | LTTNG_ASSERT(session); |
259c2674 JD |
5896 | |
5897 | DBG("Cmd rotate set schedule session %s", session->name); | |
5898 | ||
92fe5ca1 | 5899 | if (session->live_timer || !session->output_traces) { |
66ea93b1 | 5900 | DBG("Failing ROTATION_SET_SCHEDULE command as the rotation feature is not available for this session"); |
259c2674 JD |
5901 | ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE; |
5902 | goto end; | |
5903 | } | |
5904 | ||
66ea93b1 JG |
5905 | switch (schedule_type) { |
5906 | case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD: | |
5907 | parameter_value = &session->rotate_size; | |
5908 | break; | |
5909 | case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC: | |
5910 | parameter_value = &session->rotate_timer_period; | |
5911 | if (new_value >= UINT_MAX) { | |
5912 | DBG("Failing ROTATION_SET_SCHEDULE command as the value requested for a periodic rotation schedule is invalid: %" PRIu64 " > %u (UINT_MAX)", | |
5913 | new_value, UINT_MAX); | |
5914 | ret = LTTNG_ERR_INVALID; | |
5915 | goto end; | |
5916 | } | |
5917 | break; | |
5918 | default: | |
5919 | WARN("Failing ROTATION_SET_SCHEDULE command on unknown schedule type"); | |
5920 | ret = LTTNG_ERR_INVALID; | |
259c2674 | 5921 | goto end; |
66ea93b1 JG |
5922 | } |
5923 | ||
5924 | /* Improper use of the API. */ | |
5925 | if (new_value == -1ULL) { | |
5926 | WARN("Failing ROTATION_SET_SCHEDULE command as the value requested is -1"); | |
5927 | ret = LTTNG_ERR_INVALID; | |
259c2674 JD |
5928 | goto end; |
5929 | } | |
5930 | ||
66ea93b1 JG |
5931 | /* |
5932 | * As indicated in struct ltt_session's comments, a value of == 0 means | |
5933 | * this schedule rotation type is not in use. | |
5934 | * | |
5935 | * Reject the command if we were asked to activate a schedule that was | |
5936 | * already active. | |
5937 | */ | |
5938 | if (activate && *parameter_value != 0) { | |
5939 | DBG("Failing ROTATION_SET_SCHEDULE (activate) command as the schedule is already active"); | |
5940 | ret = LTTNG_ERR_ROTATION_SCHEDULE_SET; | |
90936dcf | 5941 | goto end; |
66ea93b1 JG |
5942 | } |
5943 | ||
5944 | /* | |
5945 | * Reject the command if we were asked to deactivate a schedule that was | |
5946 | * not active. | |
5947 | */ | |
5948 | if (!activate && *parameter_value == 0) { | |
5949 | DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as the schedule is already inactive"); | |
5950 | ret = LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET; | |
90936dcf JD |
5951 | goto end; |
5952 | } | |
5953 | ||
66ea93b1 JG |
5954 | /* |
5955 | * Reject the command if we were asked to deactivate a schedule that | |
5956 | * doesn't exist. | |
5957 | */ | |
5958 | if (!activate && *parameter_value != new_value) { | |
5959 | DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as an inexistant schedule was provided"); | |
5960 | ret = LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET; | |
5961 | goto end; | |
5962 | } | |
259c2674 | 5963 | |
66ea93b1 JG |
5964 | *parameter_value = activate ? new_value : 0; |
5965 | ||
5966 | switch (schedule_type) { | |
5967 | case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC: | |
5968 | if (activate && session->active) { | |
5969 | /* | |
5970 | * Only start the timer if the session is active, | |
5971 | * otherwise it will be started when the session starts. | |
5972 | */ | |
92816cc3 JG |
5973 | ret = timer_session_rotation_schedule_timer_start( |
5974 | session, new_value); | |
259c2674 | 5975 | if (ret) { |
66ea93b1 | 5976 | ERR("Failed to enable session rotation timer in ROTATION_SET_SCHEDULE command"); |
259c2674 JD |
5977 | ret = LTTNG_ERR_UNK; |
5978 | goto end; | |
5979 | } | |
66ea93b1 | 5980 | } else { |
92816cc3 JG |
5981 | ret = timer_session_rotation_schedule_timer_stop( |
5982 | session); | |
66ea93b1 JG |
5983 | if (ret) { |
5984 | ERR("Failed to disable session rotation timer in ROTATION_SET_SCHEDULE command"); | |
5985 | ret = LTTNG_ERR_UNK; | |
f3ce6946 | 5986 | goto end; |
66ea93b1 | 5987 | } |
259c2674 | 5988 | } |
66ea93b1 JG |
5989 | break; |
5990 | case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD: | |
5991 | if (activate) { | |
5992 | ret = subscribe_session_consumed_size_rotation(session, | |
5993 | new_value, notification_thread_handle); | |
90936dcf | 5994 | if (ret) { |
66ea93b1 | 5995 | ERR("Failed to enable consumed-size notification in ROTATION_SET_SCHEDULE command"); |
90936dcf JD |
5996 | ret = LTTNG_ERR_UNK; |
5997 | goto end; | |
5998 | } | |
90936dcf | 5999 | } else { |
66ea93b1 JG |
6000 | ret = unsubscribe_session_consumed_size_rotation(session, |
6001 | notification_thread_handle); | |
90936dcf | 6002 | if (ret) { |
66ea93b1 | 6003 | ERR("Failed to disable consumed-size notification in ROTATION_SET_SCHEDULE command"); |
90936dcf JD |
6004 | ret = LTTNG_ERR_UNK; |
6005 | goto end; | |
6006 | } | |
66ea93b1 | 6007 | |
90936dcf | 6008 | } |
66ea93b1 JG |
6009 | break; |
6010 | default: | |
6011 | /* Would have been caught before. */ | |
6012 | abort(); | |
90936dcf JD |
6013 | } |
6014 | ||
259c2674 JD |
6015 | ret = LTTNG_OK; |
6016 | ||
6017 | goto end; | |
6018 | ||
6019 | end: | |
6020 | return ret; | |
6021 | } | |
6022 | ||
a503e1ef JG |
6023 | /* Wait for a given path to be removed before continuing. */ |
6024 | static enum lttng_error_code wait_on_path(void *path_data) | |
6025 | { | |
7966af57 | 6026 | const char *shm_path = (const char *) path_data; |
a503e1ef JG |
6027 | |
6028 | DBG("Waiting for the shm path at %s to be removed before completing session destruction", | |
6029 | shm_path); | |
6030 | while (true) { | |
6031 | int ret; | |
6032 | struct stat st; | |
6033 | ||
6034 | ret = stat(shm_path, &st); | |
6035 | if (ret) { | |
6036 | if (errno != ENOENT) { | |
6037 | PERROR("stat() returned an error while checking for the existence of the shm path"); | |
6038 | } else { | |
6039 | DBG("shm path no longer exists, completing the destruction of session"); | |
6040 | } | |
6041 | break; | |
6042 | } else { | |
6043 | if (!S_ISDIR(st.st_mode)) { | |
6044 | ERR("The type of shm path %s returned by stat() is not a directory; aborting the wait for shm path removal", | |
6045 | shm_path); | |
6046 | break; | |
6047 | } | |
6048 | } | |
6049 | usleep(SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US); | |
6050 | } | |
6051 | return LTTNG_OK; | |
6052 | } | |
6053 | ||
6054 | /* | |
6055 | * Returns a pointer to a handler to run on completion of a command. | |
6056 | * Returns NULL if no handler has to be run for the last command executed. | |
6057 | */ | |
6058 | const struct cmd_completion_handler *cmd_pop_completion_handler(void) | |
6059 | { | |
6060 | struct cmd_completion_handler *handler = current_completion_handler; | |
6061 | ||
6062 | current_completion_handler = NULL; | |
6063 | return handler; | |
6064 | } | |
6065 | ||
2f77fc4b DG |
6066 | /* |
6067 | * Init command subsystem. | |
6068 | */ | |
6069 | void cmd_init(void) | |
6070 | { | |
6071 | /* | |
d88aee68 DG |
6072 | * Set network sequence index to 1 for streams to match a relayd |
6073 | * socket on the consumer side. | |
2f77fc4b | 6074 | */ |
d88aee68 DG |
6075 | pthread_mutex_lock(&relayd_net_seq_idx_lock); |
6076 | relayd_net_seq_idx = 1; | |
6077 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
6078 | |
6079 | DBG("Command subsystem initialized"); | |
6080 | } |