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 |
2f77fc4b | 11 | #include <assert.h> |
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 | ||
588c4b0d | 18 | #include <common/buffer-view.h> |
2f77fc4b | 19 | #include <common/common.h> |
f5436bfc | 20 | #include <common/compat/string.h> |
588c4b0d | 21 | #include <common/defaults.h> |
b0880ae5 | 22 | #include <common/dynamic-buffer.h> |
588c4b0d | 23 | #include <common/kernel-ctl/kernel-ctl.h> |
588c4b0d JG |
24 | #include <common/relayd/relayd.h> |
25 | #include <common/sessiond-comm/sessiond-comm.h> | |
26 | #include <common/string-utils/string-utils.h> | |
82b69413 | 27 | #include <common/trace-chunk.h> |
588c4b0d | 28 | #include <common/utils.h> |
fe5e9e65 | 29 | |
588c4b0d | 30 | #include <lttng/action/action.h> |
fe5e9e65 | 31 | #include <lttng/action/action-internal.h> |
588c4b0d JG |
32 | #include <lttng/channel-internal.h> |
33 | #include <lttng/channel.h> | |
588c4b0d | 34 | #include <lttng/condition/condition.h> |
588c4b0d | 35 | #include <lttng/error-query-internal.h> |
fe5e9e65 | 36 | #include <lttng/event-internal.h> |
17dd1232 | 37 | #include <lttng/location-internal.h> |
588c4b0d JG |
38 | #include <lttng/rotate-internal.h> |
39 | #include <lttng/session-descriptor-internal.h> | |
40 | #include <lttng/session-internal.h> | |
588c4b0d JG |
41 | #include <lttng/trigger/trigger-internal.h> |
42 | #include <lttng/userspace-probe-internal.h> | |
2f77fc4b | 43 | |
588c4b0d JG |
44 | #include "agent-thread.h" |
45 | #include "agent.h" | |
46 | #include "buffer-registry.h" | |
2f77fc4b | 47 | #include "channel.h" |
588c4b0d | 48 | #include "cmd.h" |
2f77fc4b | 49 | #include "consumer.h" |
588c4b0d | 50 | #include "event-notifier-error-accounting.h" |
2f77fc4b | 51 | #include "event.h" |
8782cc74 | 52 | #include "health-sessiond.h" |
2f77fc4b | 53 | #include "kernel-consumer.h" |
588c4b0d | 54 | #include "kernel.h" |
2f77fc4b | 55 | #include "lttng-sessiond.h" |
0dbc2034 | 56 | #include "lttng-syscall.h" |
b0880ae5 | 57 | #include "notification-thread-commands.h" |
588c4b0d | 58 | #include "notification-thread.h" |
5c408ad8 JD |
59 | #include "rotate.h" |
60 | #include "rotation-thread.h" | |
588c4b0d | 61 | #include "session.h" |
8e319828 | 62 | #include "timer.h" |
47aa1ca6 | 63 | #include "tracker.h" |
588c4b0d | 64 | #include "utils.h" |
2f77fc4b | 65 | |
a503e1ef JG |
66 | /* Sleep for 100ms between each check for the shm path's deletion. */ |
67 | #define SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US 100000 | |
68 | ||
3e3665b8 JG |
69 | struct cmd_destroy_session_reply_context { |
70 | int reply_sock_fd; | |
71 | bool implicit_rotation_on_destroy; | |
3285a971 JG |
72 | /* |
73 | * Indicates whether or not an error occurred while launching the | |
74 | * destruction of a session. | |
75 | */ | |
76 | enum lttng_error_code destruction_status; | |
3e3665b8 JG |
77 | }; |
78 | ||
a503e1ef JG |
79 | static enum lttng_error_code wait_on_path(void *path); |
80 | ||
81 | /* | |
82 | * Command completion handler that is used by the destroy command | |
83 | * when a session that has a non-default shm_path is being destroyed. | |
84 | * | |
85 | * See comment in cmd_destroy_session() for the rationale. | |
86 | */ | |
87 | static struct destroy_completion_handler { | |
88 | struct cmd_completion_handler handler; | |
89 | char shm_path[member_sizeof(struct ltt_session, shm_path)]; | |
90 | } destroy_completion_handler = { | |
91 | .handler = { | |
92 | .run = wait_on_path, | |
93 | .data = destroy_completion_handler.shm_path | |
94 | }, | |
95 | .shm_path = { 0 }, | |
96 | }; | |
97 | ||
98 | static struct cmd_completion_handler *current_completion_handler; | |
99 | ||
2f77fc4b DG |
100 | /* |
101 | * Used to keep a unique index for each relayd socket created where this value | |
102 | * is associated with streams on the consumer so it can match the right relayd | |
d88aee68 DG |
103 | * to send to. It must be accessed with the relayd_net_seq_idx_lock |
104 | * held. | |
2f77fc4b | 105 | */ |
d88aee68 DG |
106 | static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER; |
107 | static uint64_t relayd_net_seq_idx; | |
2f77fc4b | 108 | |
7076b56e JG |
109 | static int validate_ust_event_name(const char *); |
110 | static int cmd_enable_event_internal(struct ltt_session *session, | |
df4f5a87 | 111 | const struct lttng_domain *domain, |
7076b56e JG |
112 | char *channel_name, struct lttng_event *event, |
113 | char *filter_expression, | |
2b00d462 | 114 | struct lttng_bytecode *filter, |
7076b56e JG |
115 | struct lttng_event_exclusion *exclusion, |
116 | int wpipe); | |
714363d3 JR |
117 | static int cmd_enable_channel_internal(struct ltt_session *session, |
118 | const struct lttng_domain *domain, | |
119 | const struct lttng_channel *_attr, | |
120 | int wpipe); | |
7076b56e | 121 | |
2f77fc4b DG |
122 | /* |
123 | * Create a session path used by list_lttng_sessions for the case that the | |
124 | * session consumer is on the network. | |
125 | */ | |
126 | static int build_network_session_path(char *dst, size_t size, | |
127 | struct ltt_session *session) | |
128 | { | |
129 | int ret, kdata_port, udata_port; | |
130 | struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL; | |
131 | char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX]; | |
132 | ||
133 | assert(session); | |
134 | assert(dst); | |
135 | ||
136 | memset(tmp_urls, 0, sizeof(tmp_urls)); | |
137 | memset(tmp_uurl, 0, sizeof(tmp_uurl)); | |
138 | ||
139 | kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT; | |
140 | ||
141 | if (session->kernel_session && session->kernel_session->consumer) { | |
142 | kuri = &session->kernel_session->consumer->dst.net.control; | |
143 | kdata_port = session->kernel_session->consumer->dst.net.data.port; | |
144 | } | |
145 | ||
146 | if (session->ust_session && session->ust_session->consumer) { | |
147 | uuri = &session->ust_session->consumer->dst.net.control; | |
148 | udata_port = session->ust_session->consumer->dst.net.data.port; | |
149 | } | |
150 | ||
151 | if (uuri == NULL && kuri == NULL) { | |
152 | uri = &session->consumer->dst.net.control; | |
153 | kdata_port = session->consumer->dst.net.data.port; | |
154 | } else if (kuri && uuri) { | |
155 | ret = uri_compare(kuri, uuri); | |
156 | if (ret) { | |
157 | /* Not Equal */ | |
158 | uri = kuri; | |
159 | /* Build uuri URL string */ | |
160 | ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl)); | |
161 | if (ret < 0) { | |
162 | goto error; | |
163 | } | |
164 | } else { | |
165 | uri = kuri; | |
166 | } | |
167 | } else if (kuri && uuri == NULL) { | |
168 | uri = kuri; | |
169 | } else if (uuri && kuri == NULL) { | |
170 | uri = uuri; | |
171 | } | |
172 | ||
173 | ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls)); | |
174 | if (ret < 0) { | |
175 | goto error; | |
176 | } | |
177 | ||
9aa9f900 DG |
178 | /* |
179 | * Do we have a UST url set. If yes, this means we have both kernel and UST | |
180 | * to print. | |
181 | */ | |
9d035200 | 182 | if (*tmp_uurl != '\0') { |
2f77fc4b DG |
183 | ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]", |
184 | tmp_urls, kdata_port, tmp_uurl, udata_port); | |
185 | } else { | |
9aa9f900 | 186 | int dport; |
bef08707 | 187 | if (kuri || (!kuri && !uuri)) { |
9aa9f900 DG |
188 | dport = kdata_port; |
189 | } else { | |
190 | /* No kernel URI, use the UST port. */ | |
191 | dport = udata_port; | |
192 | } | |
193 | ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport); | |
2f77fc4b DG |
194 | } |
195 | ||
196 | error: | |
197 | return ret; | |
198 | } | |
199 | ||
fb83fe64 JD |
200 | /* |
201 | * Get run-time attributes if the session has been started (discarded events, | |
202 | * lost packets). | |
203 | */ | |
204 | static int get_kernel_runtime_stats(struct ltt_session *session, | |
205 | struct ltt_kernel_channel *kchan, uint64_t *discarded_events, | |
206 | uint64_t *lost_packets) | |
207 | { | |
208 | int ret; | |
209 | ||
210 | if (!session->has_been_started) { | |
211 | ret = 0; | |
212 | *discarded_events = 0; | |
213 | *lost_packets = 0; | |
214 | goto end; | |
215 | } | |
216 | ||
e1f3997a | 217 | ret = consumer_get_discarded_events(session->id, kchan->key, |
fb83fe64 JD |
218 | session->kernel_session->consumer, |
219 | discarded_events); | |
220 | if (ret < 0) { | |
221 | goto end; | |
222 | } | |
223 | ||
e1f3997a | 224 | ret = consumer_get_lost_packets(session->id, kchan->key, |
fb83fe64 JD |
225 | session->kernel_session->consumer, |
226 | lost_packets); | |
227 | if (ret < 0) { | |
228 | goto end; | |
229 | } | |
230 | ||
231 | end: | |
232 | return ret; | |
233 | } | |
234 | ||
235 | /* | |
236 | * Get run-time attributes if the session has been started (discarded events, | |
237 | * lost packets). | |
238 | */ | |
239 | static int get_ust_runtime_stats(struct ltt_session *session, | |
240 | struct ltt_ust_channel *uchan, uint64_t *discarded_events, | |
241 | uint64_t *lost_packets) | |
242 | { | |
243 | int ret; | |
244 | struct ltt_ust_session *usess; | |
245 | ||
a91c5803 JG |
246 | if (!discarded_events || !lost_packets) { |
247 | ret = -1; | |
248 | goto end; | |
249 | } | |
250 | ||
fb83fe64 | 251 | usess = session->ust_session; |
a905c624 JG |
252 | assert(discarded_events); |
253 | assert(lost_packets); | |
fb83fe64 JD |
254 | |
255 | if (!usess || !session->has_been_started) { | |
256 | *discarded_events = 0; | |
257 | *lost_packets = 0; | |
258 | ret = 0; | |
259 | goto end; | |
260 | } | |
261 | ||
262 | if (usess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
263 | ret = ust_app_uid_get_channel_runtime_stats(usess->id, | |
264 | &usess->buffer_reg_uid_list, | |
265 | usess->consumer, uchan->id, | |
266 | uchan->attr.overwrite, | |
267 | discarded_events, | |
268 | lost_packets); | |
269 | } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
270 | ret = ust_app_pid_get_channel_runtime_stats(usess, | |
271 | uchan, usess->consumer, | |
272 | uchan->attr.overwrite, | |
273 | discarded_events, | |
274 | lost_packets); | |
275 | if (ret < 0) { | |
276 | goto end; | |
277 | } | |
278 | *discarded_events += uchan->per_pid_closed_app_discarded; | |
279 | *lost_packets += uchan->per_pid_closed_app_lost; | |
280 | } else { | |
281 | ERR("Unsupported buffer type"); | |
967bc289 | 282 | assert(0); |
fb83fe64 JD |
283 | ret = -1; |
284 | goto end; | |
285 | } | |
286 | ||
287 | end: | |
288 | return ret; | |
289 | } | |
290 | ||
3c6a091f | 291 | /* |
022d91ba | 292 | * Create a list of agent domain events. |
3c6a091f DG |
293 | * |
294 | * Return number of events in list on success or else a negative value. | |
295 | */ | |
fe5e9e65 JR |
296 | static enum lttng_error_code list_lttng_agent_events( |
297 | struct agent *agt, struct lttng_payload *reply_payload, | |
298 | unsigned int *nb_events) | |
3c6a091f | 299 | { |
fe5e9e65 JR |
300 | enum lttng_error_code ret_code; |
301 | int ret = 0; | |
302 | unsigned int local_nb_events = 0; | |
303 | struct agent_event *event; | |
3c6a091f | 304 | struct lttng_ht_iter iter; |
fe5e9e65 | 305 | unsigned long agent_event_count; |
3c6a091f | 306 | |
022d91ba | 307 | assert(agt); |
fe5e9e65 | 308 | assert(reply_payload); |
3c6a091f | 309 | |
022d91ba | 310 | DBG3("Listing agent events"); |
3c6a091f | 311 | |
e5bbf678 | 312 | rcu_read_lock(); |
e368fb43 | 313 | |
fe5e9e65 JR |
314 | agent_event_count = lttng_ht_get_count(agt->events); |
315 | if (agent_event_count == 0) { | |
316 | /* Early exit. */ | |
317 | goto end; | |
318 | } | |
b4e3ceb9 | 319 | |
fe5e9e65 JR |
320 | if (agent_event_count > UINT_MAX) { |
321 | ret_code = LTTNG_ERR_OVERFLOW; | |
322 | goto error; | |
3c6a091f DG |
323 | } |
324 | ||
fe5e9e65 JR |
325 | local_nb_events = (unsigned int) agent_event_count; |
326 | ||
327 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { | |
328 | struct lttng_event *tmp_event = lttng_event_create(); | |
329 | ||
330 | if (!tmp_event) { | |
331 | ret_code = LTTNG_ERR_NOMEM; | |
332 | goto error; | |
333 | } | |
334 | ||
335 | if (lttng_strncpy(tmp_event->name, event->name, sizeof(tmp_event->name))) { | |
336 | lttng_event_destroy(tmp_event); | |
337 | ret_code = LTTNG_ERR_FATAL; | |
338 | goto error; | |
339 | } | |
340 | ||
341 | tmp_event->name[sizeof(tmp_event->name) - 1] = '\0'; | |
342 | tmp_event->enabled = !!event->enabled_count; | |
343 | tmp_event->loglevel = event->loglevel_value; | |
344 | tmp_event->loglevel_type = event->loglevel_type; | |
345 | ||
346 | ret = lttng_event_serialize(tmp_event, 0, NULL, | |
347 | event->filter_expression, 0, NULL, reply_payload); | |
348 | lttng_event_destroy(tmp_event); | |
3c02e545 | 349 | if (ret) { |
fe5e9e65 JR |
350 | ret_code = LTTNG_ERR_FATAL; |
351 | goto error; | |
3c02e545 | 352 | } |
3c6a091f | 353 | } |
3c6a091f | 354 | |
47e52862 | 355 | end: |
fe5e9e65 JR |
356 | ret_code = LTTNG_OK; |
357 | *nb_events = local_nb_events; | |
358 | error: | |
3c02e545 | 359 | rcu_read_unlock(); |
fe5e9e65 | 360 | return ret_code; |
3c6a091f DG |
361 | } |
362 | ||
2f77fc4b DG |
363 | /* |
364 | * Create a list of ust global domain events. | |
365 | */ | |
fe5e9e65 | 366 | static enum lttng_error_code list_lttng_ust_global_events(char *channel_name, |
b4e3ceb9 | 367 | struct ltt_ust_domain_global *ust_global, |
fe5e9e65 JR |
368 | struct lttng_payload *reply_payload, |
369 | unsigned int *nb_events) | |
2f77fc4b | 370 | { |
fe5e9e65 JR |
371 | enum lttng_error_code ret_code; |
372 | int ret; | |
2f77fc4b | 373 | struct lttng_ht_iter iter; |
fe5e9e65 JR |
374 | struct lttng_ht_node_str *node; |
375 | struct ltt_ust_channel *uchan; | |
376 | struct ltt_ust_event *uevent; | |
377 | unsigned long channel_event_count; | |
378 | unsigned int local_nb_events = 0; | |
379 | ||
380 | assert(reply_payload); | |
381 | assert(nb_events); | |
2f77fc4b DG |
382 | |
383 | DBG("Listing UST global events for channel %s", channel_name); | |
384 | ||
385 | rcu_read_lock(); | |
386 | ||
e368fb43 | 387 | lttng_ht_lookup(ust_global->channels, (void *) channel_name, &iter); |
2f77fc4b DG |
388 | node = lttng_ht_iter_get_node_str(&iter); |
389 | if (node == NULL) { | |
fe5e9e65 | 390 | ret_code = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
d31d3e8c | 391 | goto end; |
2f77fc4b DG |
392 | } |
393 | ||
394 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); | |
395 | ||
fe5e9e65 JR |
396 | channel_event_count = lttng_ht_get_count(uchan->events); |
397 | if (channel_event_count == 0) { | |
398 | /* Early exit. */ | |
399 | ret_code = LTTNG_OK; | |
400 | goto end; | |
401 | } | |
402 | ||
403 | if (channel_event_count > UINT_MAX) { | |
404 | ret_code = LTTNG_ERR_OVERFLOW; | |
405 | goto error; | |
406 | } | |
407 | ||
408 | local_nb_events = (unsigned int) channel_event_count; | |
409 | ||
410 | DBG3("Listing UST global %d events", *nb_events); | |
2f77fc4b | 411 | |
b4e3ceb9 | 412 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
fe5e9e65 | 413 | struct lttng_event *tmp_event = NULL; |
e368fb43 | 414 | |
b4e3ceb9 | 415 | if (uevent->internal) { |
fe5e9e65 JR |
416 | /* This event should remain hidden from clients */ |
417 | local_nb_events--; | |
b4e3ceb9 PP |
418 | continue; |
419 | } | |
420 | ||
fe5e9e65 JR |
421 | tmp_event = lttng_event_create(); |
422 | if (!tmp_event) { | |
423 | ret_code = LTTNG_ERR_NOMEM; | |
43ed1485 JG |
424 | goto end; |
425 | } | |
2f77fc4b | 426 | |
fe5e9e65 JR |
427 | if (lttng_strncpy(tmp_event->name, uevent->attr.name, |
428 | LTTNG_SYMBOL_NAME_LEN)) { | |
429 | ret_code = LTTNG_ERR_FATAL; | |
430 | lttng_event_destroy(tmp_event); | |
431 | goto end; | |
432 | } | |
433 | ||
434 | tmp_event->name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
435 | tmp_event->enabled = uevent->enabled; | |
2f77fc4b DG |
436 | |
437 | switch (uevent->attr.instrumentation) { | |
fc4b93fa | 438 | case LTTNG_UST_ABI_TRACEPOINT: |
fe5e9e65 | 439 | tmp_event->type = LTTNG_EVENT_TRACEPOINT; |
2f77fc4b | 440 | break; |
fc4b93fa | 441 | case LTTNG_UST_ABI_PROBE: |
fe5e9e65 | 442 | tmp_event->type = LTTNG_EVENT_PROBE; |
2f77fc4b | 443 | break; |
fc4b93fa | 444 | case LTTNG_UST_ABI_FUNCTION: |
fe5e9e65 | 445 | tmp_event->type = LTTNG_EVENT_FUNCTION; |
2f77fc4b DG |
446 | break; |
447 | } | |
448 | ||
fe5e9e65 | 449 | tmp_event->loglevel = uevent->attr.loglevel; |
2f77fc4b | 450 | switch (uevent->attr.loglevel_type) { |
fc4b93fa | 451 | case LTTNG_UST_ABI_LOGLEVEL_ALL: |
fe5e9e65 | 452 | tmp_event->loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; |
2f77fc4b | 453 | break; |
fc4b93fa | 454 | case LTTNG_UST_ABI_LOGLEVEL_RANGE: |
fe5e9e65 | 455 | tmp_event->loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; |
2f77fc4b | 456 | break; |
fc4b93fa | 457 | case LTTNG_UST_ABI_LOGLEVEL_SINGLE: |
fe5e9e65 | 458 | tmp_event->loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; |
2f77fc4b DG |
459 | break; |
460 | } | |
461 | if (uevent->filter) { | |
fe5e9e65 | 462 | tmp_event->filter = 1; |
2f77fc4b | 463 | } |
4634f12e | 464 | if (uevent->exclusion) { |
fe5e9e65 | 465 | tmp_event->exclusion = 1; |
e368fb43 JG |
466 | } |
467 | ||
fe5e9e65 JR |
468 | /* |
469 | * We do not care about the filter bytecode and the fd from the | |
470 | * userspace_probe_location. | |
471 | */ | |
472 | ret = lttng_event_serialize(tmp_event, uevent->exclusion ? uevent->exclusion->count : 0, | |
473 | uevent->exclusion ? (char **) uevent->exclusion ->names : NULL, | |
474 | uevent->filter_expression, 0, NULL, reply_payload); | |
475 | lttng_event_destroy(tmp_event); | |
3c02e545 | 476 | if (ret) { |
fe5e9e65 JR |
477 | ret_code = LTTNG_ERR_FATAL; |
478 | goto error; | |
3c02e545 | 479 | } |
2f77fc4b DG |
480 | } |
481 | ||
d31d3e8c | 482 | end: |
fe5e9e65 JR |
483 | /* nb_events is already set at this point. */ |
484 | ret_code = LTTNG_OK; | |
485 | *nb_events = local_nb_events; | |
486 | error: | |
2f77fc4b | 487 | rcu_read_unlock(); |
fe5e9e65 | 488 | return ret_code; |
2f77fc4b DG |
489 | } |
490 | ||
491 | /* | |
492 | * Fill lttng_event array of all kernel events in the channel. | |
493 | */ | |
fe5e9e65 | 494 | static enum lttng_error_code list_lttng_kernel_events(char *channel_name, |
b4e3ceb9 | 495 | struct ltt_kernel_session *kernel_session, |
fe5e9e65 JR |
496 | struct lttng_payload *reply_payload, |
497 | unsigned int *nb_events) | |
2f77fc4b | 498 | { |
fe5e9e65 | 499 | enum lttng_error_code ret_code; |
e368fb43 | 500 | int ret; |
fe5e9e65 JR |
501 | struct ltt_kernel_event *event; |
502 | struct ltt_kernel_channel *kchan; | |
503 | ||
504 | assert(reply_payload); | |
2f77fc4b DG |
505 | |
506 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
507 | if (kchan == NULL) { | |
fe5e9e65 JR |
508 | ret_code = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
509 | goto end; | |
2f77fc4b DG |
510 | } |
511 | ||
fe5e9e65 | 512 | *nb_events = kchan->event_count; |
2f77fc4b DG |
513 | |
514 | DBG("Listing events for channel %s", kchan->channel->name); | |
515 | ||
fe5e9e65 JR |
516 | if (*nb_events == 0) { |
517 | ret_code = LTTNG_OK; | |
518 | goto end; | |
519 | } | |
520 | ||
e368fb43 | 521 | /* Kernel channels */ |
fe5e9e65 JR |
522 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { |
523 | struct lttng_event *tmp_event = lttng_event_create(); | |
2f77fc4b | 524 | |
fe5e9e65 JR |
525 | if (!tmp_event) { |
526 | ret_code = LTTNG_ERR_NOMEM; | |
527 | goto end; | |
528 | } | |
529 | ||
530 | if (lttng_strncpy(tmp_event->name, event->event->name, LTTNG_SYMBOL_NAME_LEN)) { | |
531 | lttng_event_destroy(tmp_event); | |
532 | ret_code = LTTNG_ERR_FATAL; | |
43ed1485 | 533 | goto end; |
fe5e9e65 | 534 | |
43ed1485 JG |
535 | } |
536 | ||
fe5e9e65 JR |
537 | tmp_event->name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
538 | tmp_event->enabled = event->enabled; | |
539 | tmp_event->filter = (unsigned char) !!event->filter_expression; | |
b4e3ceb9 | 540 | |
fe5e9e65 | 541 | switch (event->event->instrumentation) { |
2d6bae7e | 542 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
fe5e9e65 | 543 | tmp_event->type = LTTNG_EVENT_TRACEPOINT; |
2f77fc4b | 544 | break; |
2d6bae7e | 545 | case LTTNG_KERNEL_ABI_KRETPROBE: |
fe5e9e65 JR |
546 | tmp_event->type = LTTNG_EVENT_FUNCTION; |
547 | memcpy(&tmp_event->attr.probe, &event->event->u.kprobe, | |
2d6bae7e | 548 | sizeof(struct lttng_kernel_abi_kprobe)); |
1896972b | 549 | break; |
2d6bae7e | 550 | case LTTNG_KERNEL_ABI_KPROBE: |
fe5e9e65 JR |
551 | tmp_event->type = LTTNG_EVENT_PROBE; |
552 | memcpy(&tmp_event->attr.probe, &event->event->u.kprobe, | |
2d6bae7e | 553 | sizeof(struct lttng_kernel_abi_kprobe)); |
2f77fc4b | 554 | break; |
2d6bae7e | 555 | case LTTNG_KERNEL_ABI_UPROBE: |
fe5e9e65 | 556 | tmp_event->type = LTTNG_EVENT_USERSPACE_PROBE; |
b955b4d4 | 557 | break; |
2d6bae7e | 558 | case LTTNG_KERNEL_ABI_FUNCTION: |
fe5e9e65 JR |
559 | tmp_event->type = LTTNG_EVENT_FUNCTION; |
560 | memcpy(&(tmp_event->attr.ftrace), &event->event->u.ftrace, | |
2d6bae7e | 561 | sizeof(struct lttng_kernel_abi_function)); |
2f77fc4b | 562 | break; |
2d6bae7e | 563 | case LTTNG_KERNEL_ABI_NOOP: |
fe5e9e65 | 564 | tmp_event->type = LTTNG_EVENT_NOOP; |
2f77fc4b | 565 | break; |
2d6bae7e | 566 | case LTTNG_KERNEL_ABI_SYSCALL: |
fe5e9e65 | 567 | tmp_event->type = LTTNG_EVENT_SYSCALL; |
2f77fc4b | 568 | break; |
2d6bae7e | 569 | case LTTNG_KERNEL_ABI_ALL: |
1ab8c2ad FD |
570 | /* fall-through. */ |
571 | default: | |
2f77fc4b DG |
572 | assert(0); |
573 | break; | |
574 | } | |
b4e3ceb9 | 575 | |
fe5e9e65 JR |
576 | if (event->userspace_probe_location) { |
577 | struct lttng_userspace_probe_location *location_copy = | |
578 | lttng_userspace_probe_location_copy( | |
579 | event->userspace_probe_location); | |
580 | ||
581 | if (!location_copy) { | |
582 | lttng_event_destroy(tmp_event); | |
583 | ret_code = LTTNG_ERR_NOMEM; | |
584 | goto end; | |
585 | } | |
586 | ||
587 | ret = lttng_event_set_userspace_probe_location( | |
588 | tmp_event, location_copy); | |
589 | if (ret) { | |
590 | lttng_event_destroy(tmp_event); | |
591 | lttng_userspace_probe_location_destroy( | |
592 | location_copy); | |
593 | ret_code = LTTNG_ERR_INVALID; | |
594 | goto end; | |
595 | } | |
e368fb43 | 596 | } |
e368fb43 | 597 | |
fe5e9e65 JR |
598 | ret = lttng_event_serialize(tmp_event, 0, NULL, |
599 | event->filter_expression, 0, NULL, reply_payload); | |
600 | lttng_event_destroy(tmp_event); | |
3c02e545 | 601 | if (ret) { |
fe5e9e65 JR |
602 | ret_code = LTTNG_ERR_FATAL; |
603 | goto end; | |
3c02e545 | 604 | } |
2f77fc4b DG |
605 | } |
606 | ||
fe5e9e65 | 607 | ret_code = LTTNG_OK; |
db906c12 | 608 | end: |
fe5e9e65 | 609 | return ret_code; |
2f77fc4b DG |
610 | } |
611 | ||
612 | /* | |
613 | * Add URI so the consumer output object. Set the correct path depending on the | |
614 | * domain adding the default trace directory. | |
615 | */ | |
b178f53e JG |
616 | static enum lttng_error_code add_uri_to_consumer( |
617 | const struct ltt_session *session, | |
618 | struct consumer_output *consumer, | |
619 | struct lttng_uri *uri, enum lttng_domain_type domain) | |
2f77fc4b | 620 | { |
b178f53e JG |
621 | int ret; |
622 | enum lttng_error_code ret_code = LTTNG_OK; | |
2f77fc4b DG |
623 | |
624 | assert(uri); | |
625 | ||
626 | if (consumer == NULL) { | |
627 | DBG("No consumer detected. Don't add URI. Stopping."); | |
b178f53e | 628 | ret_code = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
629 | goto error; |
630 | } | |
631 | ||
632 | switch (domain) { | |
633 | case LTTNG_DOMAIN_KERNEL: | |
b178f53e JG |
634 | ret = lttng_strncpy(consumer->domain_subdir, |
635 | DEFAULT_KERNEL_TRACE_DIR, | |
636 | sizeof(consumer->domain_subdir)); | |
2f77fc4b DG |
637 | break; |
638 | case LTTNG_DOMAIN_UST: | |
b178f53e JG |
639 | ret = lttng_strncpy(consumer->domain_subdir, |
640 | DEFAULT_UST_TRACE_DIR, | |
641 | sizeof(consumer->domain_subdir)); | |
2f77fc4b DG |
642 | break; |
643 | default: | |
644 | /* | |
b178f53e JG |
645 | * This case is possible is we try to add the URI to the global |
646 | * tracing session consumer object which in this case there is | |
647 | * no subdir. | |
2f77fc4b | 648 | */ |
b178f53e JG |
649 | memset(consumer->domain_subdir, 0, |
650 | sizeof(consumer->domain_subdir)); | |
651 | ret = 0; | |
652 | } | |
653 | if (ret) { | |
654 | ERR("Failed to initialize consumer output domain subdirectory"); | |
655 | ret_code = LTTNG_ERR_FATAL; | |
656 | goto error; | |
2f77fc4b DG |
657 | } |
658 | ||
659 | switch (uri->dtype) { | |
660 | case LTTNG_DST_IPV4: | |
661 | case LTTNG_DST_IPV6: | |
662 | DBG2("Setting network URI to consumer"); | |
663 | ||
df75acac DG |
664 | if (consumer->type == CONSUMER_DST_NET) { |
665 | if ((uri->stype == LTTNG_STREAM_CONTROL && | |
785d2d0d DG |
666 | consumer->dst.net.control_isset) || |
667 | (uri->stype == LTTNG_STREAM_DATA && | |
668 | consumer->dst.net.data_isset)) { | |
b178f53e | 669 | ret_code = LTTNG_ERR_URL_EXIST; |
df75acac DG |
670 | goto error; |
671 | } | |
672 | } else { | |
b178f53e | 673 | memset(&consumer->dst, 0, sizeof(consumer->dst)); |
785d2d0d DG |
674 | } |
675 | ||
2f77fc4b | 676 | /* Set URI into consumer output object */ |
b178f53e | 677 | ret = consumer_set_network_uri(session, consumer, uri); |
2f77fc4b | 678 | if (ret < 0) { |
b178f53e | 679 | ret_code = -ret; |
2f77fc4b DG |
680 | goto error; |
681 | } else if (ret == 1) { | |
682 | /* | |
683 | * URI was the same in the consumer so we do not append the subdir | |
684 | * again so to not duplicate output dir. | |
685 | */ | |
b178f53e | 686 | ret_code = LTTNG_OK; |
2f77fc4b DG |
687 | goto error; |
688 | } | |
2f77fc4b DG |
689 | break; |
690 | case LTTNG_DST_PATH: | |
b178f53e JG |
691 | if (*uri->dst.path != '/' || strstr(uri->dst.path, "../")) { |
692 | ret_code = LTTNG_ERR_INVALID; | |
9ac05d92 MD |
693 | goto error; |
694 | } | |
b178f53e JG |
695 | DBG2("Setting trace directory path from URI to %s", |
696 | uri->dst.path); | |
697 | memset(&consumer->dst, 0, sizeof(consumer->dst)); | |
698 | ||
699 | ret = lttng_strncpy(consumer->dst.session_root_path, | |
700 | uri->dst.path, | |
701 | sizeof(consumer->dst.session_root_path)); | |
4df41cad JG |
702 | if (ret) { |
703 | ret_code = LTTNG_ERR_FATAL; | |
704 | goto error; | |
705 | } | |
2f77fc4b DG |
706 | consumer->type = CONSUMER_DST_LOCAL; |
707 | break; | |
708 | } | |
709 | ||
b178f53e | 710 | ret_code = LTTNG_OK; |
2f77fc4b | 711 | error: |
b178f53e | 712 | return ret_code; |
2f77fc4b DG |
713 | } |
714 | ||
715 | /* | |
716 | * Init tracing by creating trace directory and sending fds kernel consumer. | |
717 | */ | |
718 | static int init_kernel_tracing(struct ltt_kernel_session *session) | |
719 | { | |
720 | int ret = 0; | |
721 | struct lttng_ht_iter iter; | |
722 | struct consumer_socket *socket; | |
723 | ||
724 | assert(session); | |
725 | ||
e7fe706f DG |
726 | rcu_read_lock(); |
727 | ||
2f77fc4b DG |
728 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { |
729 | cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter, | |
730 | socket, node.node) { | |
2f77fc4b | 731 | pthread_mutex_lock(socket->lock); |
f50f23d9 | 732 | ret = kernel_consumer_send_session(socket, session); |
2f77fc4b DG |
733 | pthread_mutex_unlock(socket->lock); |
734 | if (ret < 0) { | |
f73fabfd | 735 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
736 | goto error; |
737 | } | |
738 | } | |
739 | } | |
740 | ||
741 | error: | |
e7fe706f | 742 | rcu_read_unlock(); |
2f77fc4b DG |
743 | return ret; |
744 | } | |
745 | ||
746 | /* | |
747 | * Create a socket to the relayd using the URI. | |
748 | * | |
749 | * On success, the relayd_sock pointer is set to the created socket. | |
9a654598 | 750 | * Else, it remains untouched and an LTTng error code is returned. |
2f77fc4b | 751 | */ |
9a654598 | 752 | static enum lttng_error_code create_connect_relayd(struct lttng_uri *uri, |
b31610f2 JD |
753 | struct lttcomm_relayd_sock **relayd_sock, |
754 | struct consumer_output *consumer) | |
2f77fc4b DG |
755 | { |
756 | int ret; | |
9a654598 | 757 | enum lttng_error_code status = LTTNG_OK; |
6151a90f | 758 | struct lttcomm_relayd_sock *rsock; |
2f77fc4b | 759 | |
6151a90f JD |
760 | rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR, |
761 | RELAYD_VERSION_COMM_MINOR); | |
762 | if (!rsock) { | |
9a654598 | 763 | status = LTTNG_ERR_FATAL; |
2f77fc4b DG |
764 | goto error; |
765 | } | |
766 | ||
ffe60014 DG |
767 | /* |
768 | * Connect to relayd so we can proceed with a session creation. This call | |
769 | * can possibly block for an arbitrary amount of time to set the health | |
770 | * state to be in poll execution. | |
771 | */ | |
772 | health_poll_entry(); | |
6151a90f | 773 | ret = relayd_connect(rsock); |
ffe60014 | 774 | health_poll_exit(); |
2f77fc4b DG |
775 | if (ret < 0) { |
776 | ERR("Unable to reach lttng-relayd"); | |
9a654598 | 777 | status = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
778 | goto free_sock; |
779 | } | |
780 | ||
781 | /* Create socket for control stream. */ | |
782 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
eacb7b6f MD |
783 | uint64_t result_flags; |
784 | ||
2f77fc4b DG |
785 | DBG3("Creating relayd stream socket from URI"); |
786 | ||
787 | /* Check relayd version */ | |
6151a90f | 788 | ret = relayd_version_check(rsock); |
67d5aa28 | 789 | if (ret == LTTNG_ERR_RELAYD_VERSION_FAIL) { |
9a654598 | 790 | status = LTTNG_ERR_RELAYD_VERSION_FAIL; |
67d5aa28 JD |
791 | goto close_sock; |
792 | } else if (ret < 0) { | |
793 | ERR("Unable to reach lttng-relayd"); | |
9a654598 | 794 | status = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
795 | goto close_sock; |
796 | } | |
b31610f2 JD |
797 | consumer->relay_major_version = rsock->major; |
798 | consumer->relay_minor_version = rsock->minor; | |
eacb7b6f MD |
799 | ret = relayd_get_configuration(rsock, 0, |
800 | &result_flags); | |
801 | if (ret < 0) { | |
802 | ERR("Unable to get relayd configuration"); | |
803 | status = LTTNG_ERR_RELAYD_CONNECT_FAIL; | |
804 | goto close_sock; | |
805 | } | |
806 | if (result_flags & LTTCOMM_RELAYD_CONFIGURATION_FLAG_CLEAR_ALLOWED) { | |
807 | consumer->relay_allows_clear = true; | |
808 | } | |
2f77fc4b DG |
809 | } else if (uri->stype == LTTNG_STREAM_DATA) { |
810 | DBG3("Creating relayd data socket from URI"); | |
811 | } else { | |
812 | /* Command is not valid */ | |
813 | ERR("Relayd invalid stream type: %d", uri->stype); | |
9a654598 | 814 | status = LTTNG_ERR_INVALID; |
2f77fc4b DG |
815 | goto close_sock; |
816 | } | |
817 | ||
6151a90f | 818 | *relayd_sock = rsock; |
2f77fc4b | 819 | |
9a654598 | 820 | return status; |
2f77fc4b DG |
821 | |
822 | close_sock: | |
6151a90f JD |
823 | /* The returned value is not useful since we are on an error path. */ |
824 | (void) relayd_close(rsock); | |
2f77fc4b | 825 | free_sock: |
6151a90f | 826 | free(rsock); |
2f77fc4b | 827 | error: |
9a654598 | 828 | return status; |
2f77fc4b DG |
829 | } |
830 | ||
831 | /* | |
832 | * Connect to the relayd using URI and send the socket to the right consumer. | |
43fade62 JG |
833 | * |
834 | * The consumer socket lock must be held by the caller. | |
9a654598 JG |
835 | * |
836 | * Returns LTTNG_OK on success or an LTTng error code on failure. | |
2f77fc4b | 837 | */ |
9a654598 JG |
838 | static enum lttng_error_code send_consumer_relayd_socket( |
839 | unsigned int session_id, | |
3044f922 | 840 | struct lttng_uri *relayd_uri, |
56a37563 | 841 | struct consumer_output *consumer, |
d3e2ba59 | 842 | struct consumer_socket *consumer_sock, |
fb9a95c4 | 843 | const char *session_name, const char *hostname, |
6fa5fe7c | 844 | const char *base_path, int session_live_timer, |
0e270a1e | 845 | const uint64_t *current_chunk_id, |
46ef2188 MD |
846 | time_t session_creation_time, |
847 | bool session_name_contains_creation_time) | |
2f77fc4b DG |
848 | { |
849 | int ret; | |
6151a90f | 850 | struct lttcomm_relayd_sock *rsock = NULL; |
9a654598 | 851 | enum lttng_error_code status; |
2f77fc4b | 852 | |
ffe60014 | 853 | /* Connect to relayd and make version check if uri is the control. */ |
9a654598 JG |
854 | status = create_connect_relayd(relayd_uri, &rsock, consumer); |
855 | if (status != LTTNG_OK) { | |
9e218353 | 856 | goto relayd_comm_error; |
ffe60014 | 857 | } |
6151a90f | 858 | assert(rsock); |
ffe60014 | 859 | |
2f77fc4b | 860 | /* Set the network sequence index if not set. */ |
d88aee68 DG |
861 | if (consumer->net_seq_index == (uint64_t) -1ULL) { |
862 | pthread_mutex_lock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
863 | /* |
864 | * Increment net_seq_idx because we are about to transfer the | |
865 | * new relayd socket to the consumer. | |
d88aee68 | 866 | * Assign unique key so the consumer can match streams. |
2f77fc4b | 867 | */ |
d88aee68 DG |
868 | consumer->net_seq_index = ++relayd_net_seq_idx; |
869 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
870 | } |
871 | ||
2f77fc4b | 872 | /* Send relayd socket to consumer. */ |
6151a90f | 873 | ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer, |
d3e2ba59 | 874 | relayd_uri->stype, session_id, |
6fa5fe7c MD |
875 | session_name, hostname, base_path, |
876 | session_live_timer, current_chunk_id, | |
46ef2188 | 877 | session_creation_time, session_name_contains_creation_time); |
2f77fc4b | 878 | if (ret < 0) { |
9a654598 | 879 | status = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
880 | goto close_sock; |
881 | } | |
882 | ||
c890b720 DG |
883 | /* Flag that the corresponding socket was sent. */ |
884 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
ffe60014 | 885 | consumer_sock->control_sock_sent = 1; |
c890b720 | 886 | } else if (relayd_uri->stype == LTTNG_STREAM_DATA) { |
ffe60014 | 887 | consumer_sock->data_sock_sent = 1; |
c890b720 DG |
888 | } |
889 | ||
2f77fc4b DG |
890 | /* |
891 | * Close socket which was dup on the consumer side. The session daemon does | |
892 | * NOT keep track of the relayd socket(s) once transfer to the consumer. | |
893 | */ | |
894 | ||
895 | close_sock: | |
9a654598 | 896 | if (status != LTTNG_OK) { |
ffe60014 | 897 | /* |
d9078d0c DG |
898 | * The consumer output for this session should not be used anymore |
899 | * since the relayd connection failed thus making any tracing or/and | |
900 | * streaming not usable. | |
ffe60014 | 901 | */ |
d9078d0c | 902 | consumer->enabled = 0; |
ffe60014 | 903 | } |
9e218353 JR |
904 | (void) relayd_close(rsock); |
905 | free(rsock); | |
906 | ||
907 | relayd_comm_error: | |
9a654598 | 908 | return status; |
2f77fc4b DG |
909 | } |
910 | ||
911 | /* | |
912 | * Send both relayd sockets to a specific consumer and domain. This is a | |
913 | * helper function to facilitate sending the information to the consumer for a | |
914 | * session. | |
43fade62 JG |
915 | * |
916 | * The consumer socket lock must be held by the caller. | |
9a654598 JG |
917 | * |
918 | * Returns LTTNG_OK, or an LTTng error code on failure. | |
2f77fc4b | 919 | */ |
9a654598 JG |
920 | static enum lttng_error_code send_consumer_relayd_sockets( |
921 | enum lttng_domain_type domain, | |
56a37563 | 922 | unsigned int session_id, struct consumer_output *consumer, |
fb9a95c4 | 923 | struct consumer_socket *sock, const char *session_name, |
6fa5fe7c | 924 | const char *hostname, const char *base_path, int session_live_timer, |
46ef2188 MD |
925 | const uint64_t *current_chunk_id, time_t session_creation_time, |
926 | bool session_name_contains_creation_time) | |
2f77fc4b | 927 | { |
9a654598 | 928 | enum lttng_error_code status = LTTNG_OK; |
2f77fc4b | 929 | |
2f77fc4b | 930 | assert(consumer); |
6dc3064a | 931 | assert(sock); |
2f77fc4b | 932 | |
2f77fc4b | 933 | /* Sending control relayd socket. */ |
ffe60014 | 934 | if (!sock->control_sock_sent) { |
9a654598 | 935 | status = send_consumer_relayd_socket(session_id, |
d3e2ba59 | 936 | &consumer->dst.net.control, consumer, sock, |
6fa5fe7c | 937 | session_name, hostname, base_path, session_live_timer, |
46ef2188 MD |
938 | current_chunk_id, session_creation_time, |
939 | session_name_contains_creation_time); | |
9a654598 | 940 | if (status != LTTNG_OK) { |
c890b720 DG |
941 | goto error; |
942 | } | |
2f77fc4b DG |
943 | } |
944 | ||
945 | /* Sending data relayd socket. */ | |
ffe60014 | 946 | if (!sock->data_sock_sent) { |
9a654598 | 947 | status = send_consumer_relayd_socket(session_id, |
d3e2ba59 | 948 | &consumer->dst.net.data, consumer, sock, |
6fa5fe7c | 949 | session_name, hostname, base_path, session_live_timer, |
46ef2188 MD |
950 | current_chunk_id, session_creation_time, |
951 | session_name_contains_creation_time); | |
9a654598 | 952 | if (status != LTTNG_OK) { |
c890b720 DG |
953 | goto error; |
954 | } | |
2f77fc4b DG |
955 | } |
956 | ||
2f77fc4b | 957 | error: |
9a654598 | 958 | return status; |
2f77fc4b DG |
959 | } |
960 | ||
961 | /* | |
962 | * Setup relayd connections for a tracing session. First creates the socket to | |
963 | * the relayd and send them to the right domain consumer. Consumer type MUST be | |
964 | * network. | |
965 | */ | |
ffe60014 | 966 | int cmd_setup_relayd(struct ltt_session *session) |
2f77fc4b | 967 | { |
f73fabfd | 968 | int ret = LTTNG_OK; |
2f77fc4b DG |
969 | struct ltt_ust_session *usess; |
970 | struct ltt_kernel_session *ksess; | |
971 | struct consumer_socket *socket; | |
972 | struct lttng_ht_iter iter; | |
0e270a1e | 973 | LTTNG_OPTIONAL(uint64_t) current_chunk_id = {}; |
2f77fc4b | 974 | |
0e270a1e | 975 | assert(session); |
2f77fc4b DG |
976 | |
977 | usess = session->ust_session; | |
978 | ksess = session->kernel_session; | |
979 | ||
785d2d0d | 980 | DBG("Setting relayd for session %s", session->name); |
2f77fc4b | 981 | |
aa997ea3 | 982 | rcu_read_lock(); |
1e791a74 JG |
983 | if (session->current_trace_chunk) { |
984 | enum lttng_trace_chunk_status status = lttng_trace_chunk_get_id( | |
985 | session->current_trace_chunk, ¤t_chunk_id.value); | |
986 | ||
987 | if (status == LTTNG_TRACE_CHUNK_STATUS_OK) { | |
988 | current_chunk_id.is_set = true; | |
989 | } else { | |
990 | ERR("Failed to get current trace chunk id"); | |
991 | ret = LTTNG_ERR_UNK; | |
992 | goto error; | |
993 | } | |
994 | } | |
995 | ||
2f77fc4b DG |
996 | if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET |
997 | && usess->consumer->enabled) { | |
998 | /* For each consumer socket, send relayd sockets */ | |
999 | cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, | |
1000 | socket, node.node) { | |
2f77fc4b | 1001 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1002 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id, |
d3e2ba59 JD |
1003 | usess->consumer, socket, |
1004 | session->name, session->hostname, | |
6fa5fe7c | 1005 | session->base_path, |
1e791a74 | 1006 | session->live_timer, |
db1da059 | 1007 | current_chunk_id.is_set ? ¤t_chunk_id.value : NULL, |
46ef2188 MD |
1008 | session->creation_time, |
1009 | session->name_contains_creation_time); | |
2f77fc4b | 1010 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1011 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1012 | goto error; |
1013 | } | |
6dc3064a DG |
1014 | /* Session is now ready for network streaming. */ |
1015 | session->net_handle = 1; | |
2f77fc4b | 1016 | } |
b31610f2 JD |
1017 | session->consumer->relay_major_version = |
1018 | usess->consumer->relay_major_version; | |
1019 | session->consumer->relay_minor_version = | |
1020 | usess->consumer->relay_minor_version; | |
eacb7b6f MD |
1021 | session->consumer->relay_allows_clear = |
1022 | usess->consumer->relay_allows_clear; | |
2f77fc4b DG |
1023 | } |
1024 | ||
1025 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET | |
1026 | && ksess->consumer->enabled) { | |
1027 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1028 | socket, node.node) { | |
2f77fc4b | 1029 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1030 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id, |
d3e2ba59 JD |
1031 | ksess->consumer, socket, |
1032 | session->name, session->hostname, | |
6fa5fe7c | 1033 | session->base_path, |
1e791a74 | 1034 | session->live_timer, |
db1da059 | 1035 | current_chunk_id.is_set ? ¤t_chunk_id.value : NULL, |
46ef2188 MD |
1036 | session->creation_time, |
1037 | session->name_contains_creation_time); | |
2f77fc4b | 1038 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1039 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1040 | goto error; |
1041 | } | |
6dc3064a DG |
1042 | /* Session is now ready for network streaming. */ |
1043 | session->net_handle = 1; | |
2f77fc4b | 1044 | } |
b31610f2 JD |
1045 | session->consumer->relay_major_version = |
1046 | ksess->consumer->relay_major_version; | |
1047 | session->consumer->relay_minor_version = | |
1048 | ksess->consumer->relay_minor_version; | |
eacb7b6f MD |
1049 | session->consumer->relay_allows_clear = |
1050 | ksess->consumer->relay_allows_clear; | |
2f77fc4b DG |
1051 | } |
1052 | ||
1053 | error: | |
e7fe706f | 1054 | rcu_read_unlock(); |
2f77fc4b DG |
1055 | return ret; |
1056 | } | |
1057 | ||
9b6c7ec5 DG |
1058 | /* |
1059 | * Start a kernel session by opening all necessary streams. | |
1060 | */ | |
4dbe1875 | 1061 | int start_kernel_session(struct ltt_kernel_session *ksess) |
9b6c7ec5 DG |
1062 | { |
1063 | int ret; | |
1064 | struct ltt_kernel_channel *kchan; | |
1065 | ||
1066 | /* Open kernel metadata */ | |
07b86b52 | 1067 | if (ksess->metadata == NULL && ksess->output_traces) { |
9b6c7ec5 DG |
1068 | ret = kernel_open_metadata(ksess); |
1069 | if (ret < 0) { | |
1070 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1071 | goto error; | |
1072 | } | |
1073 | } | |
1074 | ||
1075 | /* Open kernel metadata stream */ | |
07b86b52 | 1076 | if (ksess->metadata && ksess->metadata_stream_fd < 0) { |
9b6c7ec5 DG |
1077 | ret = kernel_open_metadata_stream(ksess); |
1078 | if (ret < 0) { | |
1079 | ERR("Kernel create metadata stream failed"); | |
1080 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1081 | goto error; | |
1082 | } | |
1083 | } | |
1084 | ||
1085 | /* For each channel */ | |
1086 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
1087 | if (kchan->stream_count == 0) { | |
1088 | ret = kernel_open_channel_stream(kchan); | |
1089 | if (ret < 0) { | |
1090 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1091 | goto error; | |
1092 | } | |
1093 | /* Update the stream global counter */ | |
1094 | ksess->stream_count_global += ret; | |
1095 | } | |
1096 | } | |
1097 | ||
1098 | /* Setup kernel consumer socket and send fds to it */ | |
1099 | ret = init_kernel_tracing(ksess); | |
e43c41c5 | 1100 | if (ret != 0) { |
9b6c7ec5 DG |
1101 | ret = LTTNG_ERR_KERN_START_FAIL; |
1102 | goto error; | |
1103 | } | |
1104 | ||
1105 | /* This start the kernel tracing */ | |
1106 | ret = kernel_start_session(ksess); | |
1107 | if (ret < 0) { | |
1108 | ret = LTTNG_ERR_KERN_START_FAIL; | |
1109 | goto error; | |
1110 | } | |
1111 | ||
1112 | /* Quiescent wait after starting trace */ | |
7d268848 | 1113 | kernel_wait_quiescent(); |
9b6c7ec5 | 1114 | |
14fb1ebe | 1115 | ksess->active = 1; |
9b6c7ec5 DG |
1116 | |
1117 | ret = LTTNG_OK; | |
1118 | ||
1119 | error: | |
1120 | return ret; | |
1121 | } | |
1122 | ||
4dbe1875 MD |
1123 | int stop_kernel_session(struct ltt_kernel_session *ksess) |
1124 | { | |
1125 | struct ltt_kernel_channel *kchan; | |
1126 | bool error_occurred = false; | |
1127 | int ret; | |
1128 | ||
1129 | if (!ksess || !ksess->active) { | |
1130 | return LTTNG_OK; | |
1131 | } | |
1132 | DBG("Stopping kernel tracing"); | |
1133 | ||
1134 | ret = kernel_stop_session(ksess); | |
1135 | if (ret < 0) { | |
1136 | ret = LTTNG_ERR_KERN_STOP_FAIL; | |
1137 | goto error; | |
1138 | } | |
1139 | ||
1140 | kernel_wait_quiescent(); | |
1141 | ||
1142 | /* Flush metadata after stopping (if exists) */ | |
1143 | if (ksess->metadata_stream_fd >= 0) { | |
1144 | ret = kernel_metadata_flush_buffer(ksess->metadata_stream_fd); | |
1145 | if (ret < 0) { | |
1146 | ERR("Kernel metadata flush failed"); | |
1147 | error_occurred = true; | |
1148 | } | |
1149 | } | |
1150 | ||
1151 | /* Flush all buffers after stopping */ | |
1152 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
1153 | ret = kernel_flush_buffer(kchan); | |
1154 | if (ret < 0) { | |
1155 | ERR("Kernel flush buffer error"); | |
1156 | error_occurred = true; | |
1157 | } | |
1158 | } | |
1159 | ||
1160 | ksess->active = 0; | |
1161 | if (error_occurred) { | |
1162 | ret = LTTNG_ERR_UNK; | |
1163 | } else { | |
1164 | ret = LTTNG_OK; | |
1165 | } | |
1166 | error: | |
1167 | return ret; | |
1168 | } | |
1169 | ||
2f77fc4b DG |
1170 | /* |
1171 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. | |
1172 | */ | |
56a37563 JG |
1173 | int cmd_disable_channel(struct ltt_session *session, |
1174 | enum lttng_domain_type domain, char *channel_name) | |
2f77fc4b DG |
1175 | { |
1176 | int ret; | |
1177 | struct ltt_ust_session *usess; | |
1178 | ||
1179 | usess = session->ust_session; | |
1180 | ||
2223c96f DG |
1181 | rcu_read_lock(); |
1182 | ||
2f77fc4b DG |
1183 | switch (domain) { |
1184 | case LTTNG_DOMAIN_KERNEL: | |
1185 | { | |
1186 | ret = channel_kernel_disable(session->kernel_session, | |
1187 | channel_name); | |
f73fabfd | 1188 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1189 | goto error; |
1190 | } | |
1191 | ||
7d268848 | 1192 | kernel_wait_quiescent(); |
2f77fc4b DG |
1193 | break; |
1194 | } | |
1195 | case LTTNG_DOMAIN_UST: | |
1196 | { | |
1197 | struct ltt_ust_channel *uchan; | |
1198 | struct lttng_ht *chan_ht; | |
1199 | ||
1200 | chan_ht = usess->domain_global.channels; | |
1201 | ||
1202 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
1203 | if (uchan == NULL) { | |
f73fabfd | 1204 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
1205 | goto error; |
1206 | } | |
1207 | ||
7972aab2 | 1208 | ret = channel_ust_disable(usess, uchan); |
f73fabfd | 1209 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1210 | goto error; |
1211 | } | |
1212 | break; | |
1213 | } | |
2f77fc4b | 1214 | default: |
f73fabfd | 1215 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1216 | goto error; |
1217 | } | |
1218 | ||
f73fabfd | 1219 | ret = LTTNG_OK; |
2f77fc4b DG |
1220 | |
1221 | error: | |
2223c96f | 1222 | rcu_read_unlock(); |
2f77fc4b DG |
1223 | return ret; |
1224 | } | |
1225 | ||
1226 | /* | |
1227 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
1228 | * | |
1229 | * The wpipe arguments is used as a notifier for the kernel thread. | |
1230 | */ | |
714363d3 JR |
1231 | int cmd_enable_channel(struct command_ctx *cmd_ctx, int sock, int wpipe) |
1232 | { | |
1233 | int ret; | |
1234 | size_t channel_len; | |
1235 | ssize_t sock_recv_len; | |
1236 | struct lttng_channel *channel = NULL; | |
1237 | struct lttng_buffer_view view; | |
1238 | struct lttng_dynamic_buffer channel_buffer; | |
1239 | const struct lttng_domain command_domain = cmd_ctx->lsm.domain; | |
1240 | ||
1241 | lttng_dynamic_buffer_init(&channel_buffer); | |
1242 | channel_len = (size_t) cmd_ctx->lsm.u.channel.length; | |
1243 | ret = lttng_dynamic_buffer_set_size(&channel_buffer, channel_len); | |
1244 | if (ret) { | |
1245 | ret = LTTNG_ERR_NOMEM; | |
1246 | goto end; | |
1247 | } | |
1248 | ||
1249 | sock_recv_len = lttcomm_recv_unix_sock(sock, channel_buffer.data, | |
1250 | channel_len); | |
1251 | if (sock_recv_len < 0 || sock_recv_len != channel_len) { | |
1252 | ERR("Failed to receive \"enable channel\" command payload"); | |
1253 | ret = LTTNG_ERR_INVALID; | |
1254 | goto end; | |
1255 | } | |
1256 | ||
1257 | view = lttng_buffer_view_from_dynamic_buffer(&channel_buffer, 0, channel_len); | |
1258 | if (!lttng_buffer_view_is_valid(&view)) { | |
1259 | ret = LTTNG_ERR_INVALID; | |
1260 | goto end; | |
1261 | } | |
1262 | ||
1263 | if (lttng_channel_create_from_buffer(&view, &channel) != channel_len) { | |
1264 | ERR("Invalid channel payload received in \"enable channel\" command"); | |
1265 | ret = LTTNG_ERR_INVALID; | |
1266 | goto end; | |
1267 | } | |
1268 | ||
1269 | ret = cmd_enable_channel_internal( | |
1270 | cmd_ctx->session, &command_domain, channel, wpipe); | |
1271 | ||
1272 | end: | |
1273 | lttng_dynamic_buffer_reset(&channel_buffer); | |
1274 | lttng_channel_destroy(channel); | |
1275 | return ret; | |
1276 | } | |
1277 | ||
1278 | static int cmd_enable_channel_internal(struct ltt_session *session, | |
1279 | const struct lttng_domain *domain, | |
1280 | const struct lttng_channel *_attr, | |
1281 | int wpipe) | |
2f77fc4b DG |
1282 | { |
1283 | int ret; | |
1284 | struct ltt_ust_session *usess = session->ust_session; | |
1285 | struct lttng_ht *chan_ht; | |
1f345e94 | 1286 | size_t len; |
714363d3 | 1287 | struct lttng_channel *attr = NULL; |
2f77fc4b DG |
1288 | |
1289 | assert(session); | |
df4f5a87 | 1290 | assert(_attr); |
7972aab2 | 1291 | assert(domain); |
2f77fc4b | 1292 | |
714363d3 JR |
1293 | attr = lttng_channel_copy(_attr); |
1294 | if (!attr) { | |
1295 | ret = -LTTNG_ERR_NOMEM; | |
1296 | goto end; | |
1297 | } | |
1298 | ||
1299 | len = lttng_strnlen(attr->name, sizeof(attr->name)); | |
1f345e94 PP |
1300 | |
1301 | /* Validate channel name */ | |
714363d3 JR |
1302 | if (attr->name[0] == '.' || |
1303 | memchr(attr->name, '/', len) != NULL) { | |
1f345e94 PP |
1304 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; |
1305 | goto end; | |
1306 | } | |
1307 | ||
714363d3 | 1308 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
2f77fc4b | 1309 | |
03b4fdcf DG |
1310 | rcu_read_lock(); |
1311 | ||
ecc48a90 JD |
1312 | /* |
1313 | * If the session is a live session, remove the switch timer, the | |
1314 | * live timer does the same thing but sends also synchronisation | |
1315 | * beacons for inactive streams. | |
1316 | */ | |
1317 | if (session->live_timer > 0) { | |
714363d3 JR |
1318 | attr->attr.live_timer_interval = session->live_timer; |
1319 | attr->attr.switch_timer_interval = 0; | |
ecc48a90 JD |
1320 | } |
1321 | ||
6e21424e JR |
1322 | /* Check for feature support */ |
1323 | switch (domain->type) { | |
1324 | case LTTNG_DOMAIN_KERNEL: | |
1325 | { | |
7d268848 | 1326 | if (kernel_supports_ring_buffer_snapshot_sample_positions() != 1) { |
6e21424e JR |
1327 | /* Sampling position of buffer is not supported */ |
1328 | WARN("Kernel tracer does not support buffer monitoring. " | |
1329 | "Setting the monitor interval timer to 0 " | |
1330 | "(disabled) for channel '%s' of session '%s'", | |
714363d3 JR |
1331 | attr->name, session->name); |
1332 | lttng_channel_set_monitor_timer_interval(attr, 0); | |
6e21424e JR |
1333 | } |
1334 | break; | |
1335 | } | |
1336 | case LTTNG_DOMAIN_UST: | |
f28f9e44 | 1337 | break; |
6e21424e JR |
1338 | case LTTNG_DOMAIN_JUL: |
1339 | case LTTNG_DOMAIN_LOG4J: | |
1340 | case LTTNG_DOMAIN_PYTHON: | |
f28f9e44 JG |
1341 | if (!agent_tracing_is_enabled()) { |
1342 | DBG("Attempted to enable a channel in an agent domain but the agent thread is not running"); | |
1343 | ret = LTTNG_ERR_AGENT_TRACING_DISABLED; | |
1344 | goto error; | |
1345 | } | |
6e21424e JR |
1346 | break; |
1347 | default: | |
1348 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1349 | goto error; | |
1350 | } | |
1351 | ||
7972aab2 | 1352 | switch (domain->type) { |
2f77fc4b DG |
1353 | case LTTNG_DOMAIN_KERNEL: |
1354 | { | |
1355 | struct ltt_kernel_channel *kchan; | |
1356 | ||
714363d3 JR |
1357 | kchan = trace_kernel_get_channel_by_name( |
1358 | attr->name, session->kernel_session); | |
2f77fc4b | 1359 | if (kchan == NULL) { |
11ab4aee JR |
1360 | /* |
1361 | * Don't try to create a channel if the session has been started at | |
1362 | * some point in time before. The tracer does not allow it. | |
1363 | */ | |
1364 | if (session->has_been_started) { | |
1365 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; | |
1366 | goto error; | |
1367 | } | |
1368 | ||
54213acc JG |
1369 | if (session->snapshot.nb_output > 0 || |
1370 | session->snapshot_mode) { | |
1371 | /* Enforce mmap output for snapshot sessions. */ | |
714363d3 | 1372 | attr->attr.output = LTTNG_EVENT_MMAP; |
54213acc | 1373 | } |
714363d3 JR |
1374 | ret = channel_kernel_create( |
1375 | session->kernel_session, attr, wpipe); | |
1376 | if (attr->name[0] != '\0') { | |
85076754 MD |
1377 | session->kernel_session->has_non_default_channel = 1; |
1378 | } | |
2f77fc4b DG |
1379 | } else { |
1380 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
1381 | } | |
1382 | ||
f73fabfd | 1383 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1384 | goto error; |
1385 | } | |
1386 | ||
7d268848 | 1387 | kernel_wait_quiescent(); |
2f77fc4b DG |
1388 | break; |
1389 | } | |
1390 | case LTTNG_DOMAIN_UST: | |
9232818f JG |
1391 | case LTTNG_DOMAIN_JUL: |
1392 | case LTTNG_DOMAIN_LOG4J: | |
1393 | case LTTNG_DOMAIN_PYTHON: | |
2f77fc4b DG |
1394 | { |
1395 | struct ltt_ust_channel *uchan; | |
1396 | ||
9232818f JG |
1397 | /* |
1398 | * FIXME | |
1399 | * | |
1400 | * Current agent implementation limitations force us to allow | |
1401 | * only one channel at once in "agent" subdomains. Each | |
1402 | * subdomain has a default channel name which must be strictly | |
1403 | * adhered to. | |
1404 | */ | |
1405 | if (domain->type == LTTNG_DOMAIN_JUL) { | |
714363d3 | 1406 | if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME, |
9232818f JG |
1407 | LTTNG_SYMBOL_NAME_LEN)) { |
1408 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1409 | goto error; | |
1410 | } | |
1411 | } else if (domain->type == LTTNG_DOMAIN_LOG4J) { | |
714363d3 | 1412 | if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME, |
9232818f JG |
1413 | LTTNG_SYMBOL_NAME_LEN)) { |
1414 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1415 | goto error; | |
1416 | } | |
1417 | } else if (domain->type == LTTNG_DOMAIN_PYTHON) { | |
714363d3 | 1418 | if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME, |
9232818f JG |
1419 | LTTNG_SYMBOL_NAME_LEN)) { |
1420 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1421 | goto error; | |
1422 | } | |
1423 | } | |
1424 | ||
2f77fc4b DG |
1425 | chan_ht = usess->domain_global.channels; |
1426 | ||
714363d3 | 1427 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); |
2f77fc4b | 1428 | if (uchan == NULL) { |
11ab4aee JR |
1429 | /* |
1430 | * Don't try to create a channel if the session has been started at | |
1431 | * some point in time before. The tracer does not allow it. | |
1432 | */ | |
1433 | if (session->has_been_started) { | |
1434 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; | |
1435 | goto error; | |
1436 | } | |
1437 | ||
714363d3 JR |
1438 | ret = channel_ust_create(usess, attr, domain->buf_type); |
1439 | if (attr->name[0] != '\0') { | |
85076754 MD |
1440 | usess->has_non_default_channel = 1; |
1441 | } | |
2f77fc4b | 1442 | } else { |
7972aab2 | 1443 | ret = channel_ust_enable(usess, uchan); |
2f77fc4b DG |
1444 | } |
1445 | break; | |
1446 | } | |
2f77fc4b | 1447 | default: |
f73fabfd | 1448 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1449 | goto error; |
1450 | } | |
1451 | ||
714363d3 | 1452 | if (ret == LTTNG_OK && attr->attr.output != LTTNG_EVENT_MMAP) { |
54213acc JG |
1453 | session->has_non_mmap_channel = true; |
1454 | } | |
2f77fc4b | 1455 | error: |
2223c96f | 1456 | rcu_read_unlock(); |
1f345e94 | 1457 | end: |
714363d3 | 1458 | lttng_channel_destroy(attr); |
2f77fc4b DG |
1459 | return ret; |
1460 | } | |
1461 | ||
159b042f JG |
1462 | enum lttng_error_code cmd_process_attr_tracker_get_tracking_policy( |
1463 | struct ltt_session *session, | |
1464 | enum lttng_domain_type domain, | |
1465 | enum lttng_process_attr process_attr, | |
1466 | enum lttng_tracking_policy *policy) | |
1467 | { | |
1468 | enum lttng_error_code ret_code = LTTNG_OK; | |
1469 | const struct process_attr_tracker *tracker; | |
1470 | ||
1471 | switch (domain) { | |
1472 | case LTTNG_DOMAIN_KERNEL: | |
1473 | if (!session->kernel_session) { | |
1474 | ret_code = LTTNG_ERR_INVALID; | |
1475 | goto end; | |
1476 | } | |
1477 | tracker = kernel_get_process_attr_tracker( | |
1478 | session->kernel_session, process_attr); | |
1479 | break; | |
1480 | case LTTNG_DOMAIN_UST: | |
1481 | if (!session->ust_session) { | |
1482 | ret_code = LTTNG_ERR_INVALID; | |
1483 | goto end; | |
1484 | } | |
1485 | tracker = trace_ust_get_process_attr_tracker( | |
1486 | session->ust_session, process_attr); | |
1487 | break; | |
1488 | default: | |
1489 | ret_code = LTTNG_ERR_UNSUPPORTED_DOMAIN; | |
1490 | goto end; | |
1491 | } | |
1492 | if (tracker) { | |
1493 | *policy = process_attr_tracker_get_tracking_policy(tracker); | |
1494 | } else { | |
1495 | ret_code = LTTNG_ERR_INVALID; | |
1496 | } | |
1497 | end: | |
1498 | return ret_code; | |
1499 | } | |
1500 | ||
1501 | enum lttng_error_code cmd_process_attr_tracker_set_tracking_policy( | |
1502 | struct ltt_session *session, | |
1503 | enum lttng_domain_type domain, | |
1504 | enum lttng_process_attr process_attr, | |
1505 | enum lttng_tracking_policy policy) | |
1506 | { | |
1507 | enum lttng_error_code ret_code = LTTNG_OK; | |
1508 | ||
1509 | switch (policy) { | |
1510 | case LTTNG_TRACKING_POLICY_INCLUDE_SET: | |
1511 | case LTTNG_TRACKING_POLICY_EXCLUDE_ALL: | |
1512 | case LTTNG_TRACKING_POLICY_INCLUDE_ALL: | |
1513 | break; | |
1514 | default: | |
1515 | ret_code = LTTNG_ERR_INVALID; | |
1516 | goto end; | |
1517 | } | |
1518 | ||
1519 | switch (domain) { | |
1520 | case LTTNG_DOMAIN_KERNEL: | |
1521 | if (!session->kernel_session) { | |
1522 | ret_code = LTTNG_ERR_INVALID; | |
1523 | goto end; | |
1524 | } | |
1525 | ret_code = kernel_process_attr_tracker_set_tracking_policy( | |
1526 | session->kernel_session, process_attr, policy); | |
1527 | break; | |
1528 | case LTTNG_DOMAIN_UST: | |
1529 | if (!session->ust_session) { | |
1530 | ret_code = LTTNG_ERR_INVALID; | |
1531 | goto end; | |
1532 | } | |
1533 | ret_code = trace_ust_process_attr_tracker_set_tracking_policy( | |
1534 | session->ust_session, process_attr, policy); | |
1535 | break; | |
1536 | default: | |
1537 | ret_code = LTTNG_ERR_UNSUPPORTED_DOMAIN; | |
1538 | break; | |
1539 | } | |
1540 | end: | |
1541 | return ret_code; | |
1542 | } | |
1543 | ||
1544 | enum lttng_error_code cmd_process_attr_tracker_inclusion_set_add_value( | |
1545 | struct ltt_session *session, | |
1546 | enum lttng_domain_type domain, | |
1547 | enum lttng_process_attr process_attr, | |
1548 | const struct process_attr_value *value) | |
1549 | { | |
1550 | enum lttng_error_code ret_code = LTTNG_OK; | |
1551 | ||
1552 | switch (domain) { | |
1553 | case LTTNG_DOMAIN_KERNEL: | |
1554 | if (!session->kernel_session) { | |
1555 | ret_code = LTTNG_ERR_INVALID; | |
1556 | goto end; | |
1557 | } | |
1558 | ret_code = kernel_process_attr_tracker_inclusion_set_add_value( | |
1559 | session->kernel_session, process_attr, value); | |
1560 | break; | |
1561 | case LTTNG_DOMAIN_UST: | |
1562 | if (!session->ust_session) { | |
1563 | ret_code = LTTNG_ERR_INVALID; | |
1564 | goto end; | |
1565 | } | |
1566 | ret_code = trace_ust_process_attr_tracker_inclusion_set_add_value( | |
1567 | session->ust_session, process_attr, value); | |
1568 | break; | |
1569 | default: | |
1570 | ret_code = LTTNG_ERR_UNSUPPORTED_DOMAIN; | |
1571 | break; | |
1572 | } | |
1573 | end: | |
1574 | return ret_code; | |
1575 | } | |
1576 | ||
1577 | enum lttng_error_code cmd_process_attr_tracker_inclusion_set_remove_value( | |
1578 | struct ltt_session *session, | |
1579 | enum lttng_domain_type domain, | |
1580 | enum lttng_process_attr process_attr, | |
1581 | const struct process_attr_value *value) | |
1582 | { | |
1583 | enum lttng_error_code ret_code = LTTNG_OK; | |
1584 | ||
1585 | switch (domain) { | |
1586 | case LTTNG_DOMAIN_KERNEL: | |
1587 | if (!session->kernel_session) { | |
1588 | ret_code = LTTNG_ERR_INVALID; | |
1589 | goto end; | |
1590 | } | |
1591 | ret_code = kernel_process_attr_tracker_inclusion_set_remove_value( | |
1592 | session->kernel_session, process_attr, value); | |
1593 | break; | |
1594 | case LTTNG_DOMAIN_UST: | |
1595 | if (!session->ust_session) { | |
1596 | ret_code = LTTNG_ERR_INVALID; | |
1597 | goto end; | |
1598 | } | |
1599 | ret_code = trace_ust_process_attr_tracker_inclusion_set_remove_value( | |
1600 | session->ust_session, process_attr, value); | |
1601 | break; | |
1602 | default: | |
1603 | ret_code = LTTNG_ERR_UNSUPPORTED_DOMAIN; | |
1604 | break; | |
1605 | } | |
1606 | end: | |
1607 | return ret_code; | |
1608 | } | |
1609 | ||
1610 | enum lttng_error_code cmd_process_attr_tracker_get_inclusion_set( | |
1611 | struct ltt_session *session, | |
1612 | enum lttng_domain_type domain, | |
1613 | enum lttng_process_attr process_attr, | |
1614 | struct lttng_process_attr_values **values) | |
1615 | { | |
1616 | enum lttng_error_code ret_code = LTTNG_OK; | |
1617 | const struct process_attr_tracker *tracker; | |
1618 | enum process_attr_tracker_status status; | |
1619 | ||
1620 | switch (domain) { | |
1621 | case LTTNG_DOMAIN_KERNEL: | |
1622 | if (!session->kernel_session) { | |
1623 | ret_code = LTTNG_ERR_INVALID; | |
1624 | goto end; | |
1625 | } | |
1626 | tracker = kernel_get_process_attr_tracker( | |
1627 | session->kernel_session, process_attr); | |
1628 | break; | |
1629 | case LTTNG_DOMAIN_UST: | |
1630 | if (!session->ust_session) { | |
1631 | ret_code = LTTNG_ERR_INVALID; | |
1632 | goto end; | |
1633 | } | |
1634 | tracker = trace_ust_get_process_attr_tracker( | |
1635 | session->ust_session, process_attr); | |
1636 | break; | |
1637 | default: | |
1638 | ret_code = LTTNG_ERR_UNSUPPORTED_DOMAIN; | |
1639 | goto end; | |
1640 | } | |
1641 | ||
1642 | if (!tracker) { | |
1643 | ret_code = LTTNG_ERR_INVALID; | |
1644 | goto end; | |
1645 | } | |
1646 | ||
1647 | status = process_attr_tracker_get_inclusion_set(tracker, values); | |
1648 | switch (status) { | |
1649 | case PROCESS_ATTR_TRACKER_STATUS_OK: | |
1650 | ret_code = LTTNG_OK; | |
1651 | break; | |
1652 | case PROCESS_ATTR_TRACKER_STATUS_INVALID_TRACKING_POLICY: | |
1653 | ret_code = LTTNG_ERR_PROCESS_ATTR_TRACKER_INVALID_TRACKING_POLICY; | |
1654 | break; | |
1655 | case PROCESS_ATTR_TRACKER_STATUS_ERROR: | |
1656 | ret_code = LTTNG_ERR_NOMEM; | |
1657 | break; | |
1658 | default: | |
1659 | ret_code = LTTNG_ERR_UNK; | |
1660 | break; | |
1661 | } | |
1662 | ||
1663 | end: | |
1664 | return ret_code; | |
1665 | } | |
1666 | ||
2f77fc4b DG |
1667 | /* |
1668 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1669 | */ | |
fe5e9e65 JR |
1670 | int cmd_disable_event(struct command_ctx *cmd_ctx, |
1671 | struct lttng_event *event, | |
1672 | char *filter_expression, | |
1673 | struct lttng_bytecode *bytecode, | |
1674 | struct lttng_event_exclusion *exclusion) | |
2f77fc4b DG |
1675 | { |
1676 | int ret; | |
df4f5a87 | 1677 | const char *event_name; |
fe5e9e65 JR |
1678 | const struct ltt_session *session = cmd_ctx->session; |
1679 | const char *channel_name = cmd_ctx->lsm.u.disable.channel_name; | |
1680 | const enum lttng_domain_type domain = cmd_ctx->lsm.domain.type; | |
6e911cad | 1681 | |
18a720cd MD |
1682 | DBG("Disable event command for event \'%s\'", event->name); |
1683 | ||
fe5e9e65 JR |
1684 | /* |
1685 | * Filter and exclusions are simply not handled by the | |
1686 | * disable event command at this time. | |
1687 | * | |
1688 | * FIXME | |
1689 | */ | |
1690 | (void) filter_expression; | |
1691 | (void) exclusion; | |
1692 | ||
1693 | /* Ignore the presence of filter or exclusion for the event */ | |
1694 | event->filter = 0; | |
1695 | event->exclusion = 0; | |
1696 | ||
6e911cad MD |
1697 | event_name = event->name; |
1698 | ||
9b7431cf JG |
1699 | /* Error out on unhandled search criteria */ |
1700 | if (event->loglevel_type || event->loglevel != -1 || event->enabled | |
6e911cad | 1701 | || event->pid || event->filter || event->exclusion) { |
7076b56e JG |
1702 | ret = LTTNG_ERR_UNK; |
1703 | goto error; | |
6e911cad | 1704 | } |
2f77fc4b | 1705 | |
2223c96f DG |
1706 | rcu_read_lock(); |
1707 | ||
2f77fc4b DG |
1708 | switch (domain) { |
1709 | case LTTNG_DOMAIN_KERNEL: | |
1710 | { | |
1711 | struct ltt_kernel_channel *kchan; | |
1712 | struct ltt_kernel_session *ksess; | |
1713 | ||
1714 | ksess = session->kernel_session; | |
1715 | ||
85076754 MD |
1716 | /* |
1717 | * If a non-default channel has been created in the | |
1718 | * session, explicitely require that -c chan_name needs | |
1719 | * to be provided. | |
1720 | */ | |
1721 | if (ksess->has_non_default_channel && channel_name[0] == '\0') { | |
1722 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1723 | goto error_unlock; |
85076754 MD |
1724 | } |
1725 | ||
2f77fc4b DG |
1726 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
1727 | if (kchan == NULL) { | |
f73fabfd | 1728 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
7076b56e | 1729 | goto error_unlock; |
2f77fc4b DG |
1730 | } |
1731 | ||
6e911cad MD |
1732 | switch (event->type) { |
1733 | case LTTNG_EVENT_ALL: | |
9550ee81 | 1734 | case LTTNG_EVENT_TRACEPOINT: |
d0ae4ea8 | 1735 | case LTTNG_EVENT_SYSCALL: |
9550ee81 JR |
1736 | case LTTNG_EVENT_PROBE: |
1737 | case LTTNG_EVENT_FUNCTION: | |
1738 | case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */ | |
1739 | if (event_name[0] == '\0') { | |
1740 | ret = event_kernel_disable_event(kchan, | |
1741 | NULL, event->type); | |
29c62722 | 1742 | } else { |
d0ae4ea8 | 1743 | ret = event_kernel_disable_event(kchan, |
9550ee81 | 1744 | event_name, event->type); |
29c62722 | 1745 | } |
6e911cad | 1746 | if (ret != LTTNG_OK) { |
7076b56e | 1747 | goto error_unlock; |
6e911cad MD |
1748 | } |
1749 | break; | |
6e911cad MD |
1750 | default: |
1751 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1752 | goto error_unlock; |
2f77fc4b DG |
1753 | } |
1754 | ||
7d268848 | 1755 | kernel_wait_quiescent(); |
2f77fc4b DG |
1756 | break; |
1757 | } | |
1758 | case LTTNG_DOMAIN_UST: | |
1759 | { | |
1760 | struct ltt_ust_channel *uchan; | |
1761 | struct ltt_ust_session *usess; | |
1762 | ||
1763 | usess = session->ust_session; | |
1764 | ||
7076b56e JG |
1765 | if (validate_ust_event_name(event_name)) { |
1766 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1767 | goto error_unlock; | |
1768 | } | |
1769 | ||
85076754 MD |
1770 | /* |
1771 | * If a non-default channel has been created in the | |
9550ee81 | 1772 | * session, explicitly require that -c chan_name needs |
85076754 MD |
1773 | * to be provided. |
1774 | */ | |
1775 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1776 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1777 | goto error_unlock; |
85076754 MD |
1778 | } |
1779 | ||
2f77fc4b DG |
1780 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
1781 | channel_name); | |
1782 | if (uchan == NULL) { | |
f73fabfd | 1783 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
7076b56e | 1784 | goto error_unlock; |
2f77fc4b DG |
1785 | } |
1786 | ||
6e911cad MD |
1787 | switch (event->type) { |
1788 | case LTTNG_EVENT_ALL: | |
b3639870 JR |
1789 | /* |
1790 | * An empty event name means that everything | |
1791 | * should be disabled. | |
1792 | */ | |
1793 | if (event->name[0] == '\0') { | |
1794 | ret = event_ust_disable_all_tracepoints(usess, uchan); | |
77d536b2 JR |
1795 | } else { |
1796 | ret = event_ust_disable_tracepoint(usess, uchan, | |
1797 | event_name); | |
1798 | } | |
6e911cad | 1799 | if (ret != LTTNG_OK) { |
7076b56e | 1800 | goto error_unlock; |
6e911cad MD |
1801 | } |
1802 | break; | |
1803 | default: | |
1804 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1805 | goto error_unlock; |
2f77fc4b DG |
1806 | } |
1807 | ||
1808 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
1809 | channel_name); | |
1810 | break; | |
1811 | } | |
5cdb6027 | 1812 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1813 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1814 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1815 | { |
fefd409b | 1816 | struct agent *agt; |
f20baf8e DG |
1817 | struct ltt_ust_session *usess = session->ust_session; |
1818 | ||
1819 | assert(usess); | |
1820 | ||
6e911cad MD |
1821 | switch (event->type) { |
1822 | case LTTNG_EVENT_ALL: | |
1823 | break; | |
1824 | default: | |
1825 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1826 | goto error_unlock; |
6e911cad MD |
1827 | } |
1828 | ||
5cdb6027 | 1829 | agt = trace_ust_find_agent(usess, domain); |
fefd409b DG |
1830 | if (!agt) { |
1831 | ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
7076b56e | 1832 | goto error_unlock; |
fefd409b | 1833 | } |
b3639870 JR |
1834 | /* |
1835 | * An empty event name means that everything | |
1836 | * should be disabled. | |
1837 | */ | |
1838 | if (event->name[0] == '\0') { | |
18a720cd MD |
1839 | ret = event_agent_disable_all(usess, agt); |
1840 | } else { | |
1841 | ret = event_agent_disable(usess, agt, event_name); | |
1842 | } | |
f20baf8e | 1843 | if (ret != LTTNG_OK) { |
7076b56e | 1844 | goto error_unlock; |
f20baf8e DG |
1845 | } |
1846 | ||
1847 | break; | |
1848 | } | |
2f77fc4b | 1849 | default: |
f73fabfd | 1850 | ret = LTTNG_ERR_UND; |
7076b56e | 1851 | goto error_unlock; |
2f77fc4b DG |
1852 | } |
1853 | ||
f73fabfd | 1854 | ret = LTTNG_OK; |
2f77fc4b | 1855 | |
7076b56e | 1856 | error_unlock: |
2223c96f | 1857 | rcu_read_unlock(); |
7076b56e | 1858 | error: |
fe5e9e65 JR |
1859 | free(exclusion); |
1860 | free(bytecode); | |
1861 | free(filter_expression); | |
2f77fc4b DG |
1862 | return ret; |
1863 | } | |
1864 | ||
2f77fc4b DG |
1865 | /* |
1866 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1867 | */ | |
a4a3d6bd JR |
1868 | int cmd_add_context(struct command_ctx *cmd_ctx, |
1869 | const struct lttng_event_context *event_context, int kwpipe) | |
2f77fc4b | 1870 | { |
d5979e4a | 1871 | int ret, chan_kern_created = 0, chan_ust_created = 0; |
a4a3d6bd JR |
1872 | const enum lttng_domain_type domain = cmd_ctx->lsm.domain.type; |
1873 | const struct ltt_session *session = cmd_ctx->session; | |
1874 | const char *channel_name = cmd_ctx->lsm.u.context.channel_name; | |
bdf64013 | 1875 | |
9a699f7b JR |
1876 | /* |
1877 | * Don't try to add a context if the session has been started at | |
1878 | * some point in time before. The tracer does not allow it and would | |
1879 | * result in a corrupted trace. | |
1880 | */ | |
a4a3d6bd | 1881 | if (cmd_ctx->session->has_been_started) { |
9a699f7b JR |
1882 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
1883 | goto end; | |
1884 | } | |
1885 | ||
2f77fc4b DG |
1886 | switch (domain) { |
1887 | case LTTNG_DOMAIN_KERNEL: | |
979e618e DG |
1888 | assert(session->kernel_session); |
1889 | ||
1890 | if (session->kernel_session->channel_count == 0) { | |
1891 | /* Create default channel */ | |
1892 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); | |
1893 | if (ret != LTTNG_OK) { | |
1894 | goto error; | |
1895 | } | |
d5979e4a | 1896 | chan_kern_created = 1; |
979e618e | 1897 | } |
2f77fc4b | 1898 | /* Add kernel context to kernel tracer */ |
a4a3d6bd JR |
1899 | ret = context_kernel_add(session->kernel_session, |
1900 | event_context, channel_name); | |
f73fabfd | 1901 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1902 | goto error; |
1903 | } | |
1904 | break; | |
bdf64013 JG |
1905 | case LTTNG_DOMAIN_JUL: |
1906 | case LTTNG_DOMAIN_LOG4J: | |
1907 | { | |
1908 | /* | |
1909 | * Validate channel name. | |
1910 | * If no channel name is given and the domain is JUL or LOG4J, | |
1911 | * set it to the appropriate domain-specific channel name. If | |
1912 | * a name is provided but does not match the expexted channel | |
1913 | * name, return an error. | |
1914 | */ | |
1915 | if (domain == LTTNG_DOMAIN_JUL && *channel_name && | |
1916 | strcmp(channel_name, | |
1917 | DEFAULT_JUL_CHANNEL_NAME)) { | |
1918 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1919 | goto error; | |
1920 | } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name && | |
1921 | strcmp(channel_name, | |
1922 | DEFAULT_LOG4J_CHANNEL_NAME)) { | |
1923 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1924 | goto error; | |
1925 | } | |
a93b3916 | 1926 | /* break is _not_ missing here. */ |
bdf64013 | 1927 | } |
2f77fc4b DG |
1928 | case LTTNG_DOMAIN_UST: |
1929 | { | |
1930 | struct ltt_ust_session *usess = session->ust_session; | |
85076754 MD |
1931 | unsigned int chan_count; |
1932 | ||
2f77fc4b DG |
1933 | assert(usess); |
1934 | ||
85076754 | 1935 | chan_count = lttng_ht_get_count(usess->domain_global.channels); |
979e618e DG |
1936 | if (chan_count == 0) { |
1937 | struct lttng_channel *attr; | |
1938 | /* Create default channel */ | |
0a9c6494 | 1939 | attr = channel_new_default_attr(domain, usess->buffer_type); |
979e618e DG |
1940 | if (attr == NULL) { |
1941 | ret = LTTNG_ERR_FATAL; | |
1942 | goto error; | |
1943 | } | |
1944 | ||
7972aab2 | 1945 | ret = channel_ust_create(usess, attr, usess->buffer_type); |
979e618e DG |
1946 | if (ret != LTTNG_OK) { |
1947 | free(attr); | |
1948 | goto error; | |
1949 | } | |
cf0bcb51 | 1950 | channel_attr_destroy(attr); |
d5979e4a | 1951 | chan_ust_created = 1; |
979e618e DG |
1952 | } |
1953 | ||
a4a3d6bd JR |
1954 | ret = context_ust_add(usess, domain, event_context, |
1955 | channel_name); | |
f73fabfd | 1956 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1957 | goto error; |
1958 | } | |
1959 | break; | |
1960 | } | |
2f77fc4b | 1961 | default: |
f73fabfd | 1962 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1963 | goto error; |
1964 | } | |
1965 | ||
bdf64013 JG |
1966 | ret = LTTNG_OK; |
1967 | goto end; | |
2f77fc4b DG |
1968 | |
1969 | error: | |
d5979e4a DG |
1970 | if (chan_kern_created) { |
1971 | struct ltt_kernel_channel *kchan = | |
1972 | trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME, | |
1973 | session->kernel_session); | |
1974 | /* Created previously, this should NOT fail. */ | |
1975 | assert(kchan); | |
1976 | kernel_destroy_channel(kchan); | |
1977 | } | |
1978 | ||
1979 | if (chan_ust_created) { | |
1980 | struct ltt_ust_channel *uchan = | |
1981 | trace_ust_find_channel_by_name( | |
1982 | session->ust_session->domain_global.channels, | |
1983 | DEFAULT_CHANNEL_NAME); | |
1984 | /* Created previously, this should NOT fail. */ | |
1985 | assert(uchan); | |
1986 | /* Remove from the channel list of the session. */ | |
1987 | trace_ust_delete_channel(session->ust_session->domain_global.channels, | |
1988 | uchan); | |
1989 | trace_ust_destroy_channel(uchan); | |
1990 | } | |
bdf64013 | 1991 | end: |
2f77fc4b DG |
1992 | return ret; |
1993 | } | |
1994 | ||
dac8e046 JG |
1995 | static inline bool name_starts_with(const char *name, const char *prefix) |
1996 | { | |
1997 | const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN); | |
1998 | ||
1999 | return !strncmp(name, prefix, max_cmp_len); | |
2000 | } | |
2001 | ||
2002 | /* Perform userspace-specific event name validation */ | |
2003 | static int validate_ust_event_name(const char *name) | |
2004 | { | |
2005 | int ret = 0; | |
2006 | ||
2007 | if (!name) { | |
2008 | ret = -1; | |
2009 | goto end; | |
2010 | } | |
2011 | ||
2012 | /* | |
2013 | * Check name against all internal UST event component namespaces used | |
2014 | * by the agents. | |
2015 | */ | |
2016 | if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) || | |
2017 | name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) || | |
2018 | name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) { | |
2019 | ret = -1; | |
2020 | } | |
2021 | ||
2022 | end: | |
2023 | return ret; | |
2024 | } | |
88f06f15 | 2025 | |
2f77fc4b | 2026 | /* |
88f06f15 JG |
2027 | * Internal version of cmd_enable_event() with a supplemental |
2028 | * "internal_event" flag which is used to enable internal events which should | |
2029 | * be hidden from clients. Such events are used in the agent implementation to | |
2030 | * enable the events through which all "agent" events are funeled. | |
2f77fc4b | 2031 | */ |
88f06f15 | 2032 | static int _cmd_enable_event(struct ltt_session *session, |
df4f5a87 | 2033 | const struct lttng_domain *domain, |
025faf73 | 2034 | char *channel_name, struct lttng_event *event, |
6b453b5e | 2035 | char *filter_expression, |
2b00d462 | 2036 | struct lttng_bytecode *filter, |
db8f1377 | 2037 | struct lttng_event_exclusion *exclusion, |
88f06f15 | 2038 | int wpipe, bool internal_event) |
2f77fc4b | 2039 | { |
9f449915 | 2040 | int ret = 0, channel_created = 0; |
cfedea03 | 2041 | struct lttng_channel *attr = NULL; |
2f77fc4b DG |
2042 | |
2043 | assert(session); | |
2044 | assert(event); | |
2045 | assert(channel_name); | |
2046 | ||
2a385866 JG |
2047 | /* If we have a filter, we must have its filter expression */ |
2048 | assert(!(!!filter_expression ^ !!filter)); | |
2049 | ||
9f449915 PP |
2050 | /* Normalize event name as a globbing pattern */ |
2051 | strutils_normalize_star_glob_pattern(event->name); | |
18a720cd | 2052 | |
9f449915 PP |
2053 | /* Normalize exclusion names as globbing patterns */ |
2054 | if (exclusion) { | |
2055 | size_t i; | |
f5ac4bd7 | 2056 | |
9f449915 PP |
2057 | for (i = 0; i < exclusion->count; i++) { |
2058 | char *name = LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i); | |
2059 | ||
2060 | strutils_normalize_star_glob_pattern(name); | |
2061 | } | |
930a2e99 JG |
2062 | } |
2063 | ||
9f449915 PP |
2064 | DBG("Enable event command for event \'%s\'", event->name); |
2065 | ||
2066 | rcu_read_lock(); | |
2067 | ||
7972aab2 | 2068 | switch (domain->type) { |
2f77fc4b DG |
2069 | case LTTNG_DOMAIN_KERNEL: |
2070 | { | |
2071 | struct ltt_kernel_channel *kchan; | |
2072 | ||
85076754 MD |
2073 | /* |
2074 | * If a non-default channel has been created in the | |
2075 | * session, explicitely require that -c chan_name needs | |
2076 | * to be provided. | |
2077 | */ | |
2078 | if (session->kernel_session->has_non_default_channel | |
2079 | && channel_name[0] == '\0') { | |
2080 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
2081 | goto error; | |
2082 | } | |
2083 | ||
2f77fc4b DG |
2084 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2085 | session->kernel_session); | |
2086 | if (kchan == NULL) { | |
0a9c6494 DG |
2087 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
2088 | LTTNG_BUFFER_GLOBAL); | |
2f77fc4b | 2089 | if (attr == NULL) { |
f73fabfd | 2090 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2091 | goto error; |
2092 | } | |
04c17253 MD |
2093 | if (lttng_strncpy(attr->name, channel_name, |
2094 | sizeof(attr->name))) { | |
2095 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
2096 | goto error; |
2097 | } | |
2f77fc4b | 2098 | |
714363d3 JR |
2099 | ret = cmd_enable_channel_internal( |
2100 | session, domain, attr, wpipe); | |
f73fabfd | 2101 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2102 | goto error; |
2103 | } | |
e5f5db7f | 2104 | channel_created = 1; |
2f77fc4b DG |
2105 | } |
2106 | ||
2107 | /* Get the newly created kernel channel pointer */ | |
2108 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2109 | session->kernel_session); | |
2110 | if (kchan == NULL) { | |
2111 | /* This sould not happen... */ | |
f73fabfd | 2112 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2113 | goto error; |
2114 | } | |
2115 | ||
6e911cad MD |
2116 | switch (event->type) { |
2117 | case LTTNG_EVENT_ALL: | |
29c62722 | 2118 | { |
00a62084 | 2119 | char *filter_expression_a = NULL; |
2b00d462 | 2120 | struct lttng_bytecode *filter_a = NULL; |
00a62084 MD |
2121 | |
2122 | /* | |
2123 | * We need to duplicate filter_expression and filter, | |
2124 | * because ownership is passed to first enable | |
2125 | * event. | |
2126 | */ | |
2127 | if (filter_expression) { | |
2128 | filter_expression_a = strdup(filter_expression); | |
2129 | if (!filter_expression_a) { | |
2130 | ret = LTTNG_ERR_FATAL; | |
2131 | goto error; | |
2132 | } | |
2133 | } | |
2134 | if (filter) { | |
2135 | filter_a = zmalloc(sizeof(*filter_a) + filter->len); | |
2136 | if (!filter_a) { | |
2137 | free(filter_expression_a); | |
2138 | ret = LTTNG_ERR_FATAL; | |
2139 | goto error; | |
2140 | } | |
2141 | memcpy(filter_a, filter, sizeof(*filter_a) + filter->len); | |
2142 | } | |
29c62722 | 2143 | event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */ |
00a62084 MD |
2144 | ret = event_kernel_enable_event(kchan, event, |
2145 | filter_expression, filter); | |
a969e101 MD |
2146 | /* We have passed ownership */ |
2147 | filter_expression = NULL; | |
2148 | filter = NULL; | |
29c62722 MD |
2149 | if (ret != LTTNG_OK) { |
2150 | if (channel_created) { | |
2151 | /* Let's not leak a useless channel. */ | |
2152 | kernel_destroy_channel(kchan); | |
2153 | } | |
00a62084 MD |
2154 | free(filter_expression_a); |
2155 | free(filter_a); | |
29c62722 MD |
2156 | goto error; |
2157 | } | |
2158 | event->type = LTTNG_EVENT_SYSCALL; /* Hack */ | |
00a62084 MD |
2159 | ret = event_kernel_enable_event(kchan, event, |
2160 | filter_expression_a, filter_a); | |
60d21fa2 AB |
2161 | /* We have passed ownership */ |
2162 | filter_expression_a = NULL; | |
2163 | filter_a = NULL; | |
29c62722 MD |
2164 | if (ret != LTTNG_OK) { |
2165 | goto error; | |
2166 | } | |
2167 | break; | |
2168 | } | |
6e6ef3d7 | 2169 | case LTTNG_EVENT_PROBE: |
dcabc190 | 2170 | case LTTNG_EVENT_USERSPACE_PROBE: |
6e6ef3d7 DG |
2171 | case LTTNG_EVENT_FUNCTION: |
2172 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
6e911cad | 2173 | case LTTNG_EVENT_TRACEPOINT: |
00a62084 MD |
2174 | ret = event_kernel_enable_event(kchan, event, |
2175 | filter_expression, filter); | |
a969e101 MD |
2176 | /* We have passed ownership */ |
2177 | filter_expression = NULL; | |
2178 | filter = NULL; | |
6e911cad MD |
2179 | if (ret != LTTNG_OK) { |
2180 | if (channel_created) { | |
2181 | /* Let's not leak a useless channel. */ | |
2182 | kernel_destroy_channel(kchan); | |
2183 | } | |
2184 | goto error; | |
e5f5db7f | 2185 | } |
6e911cad MD |
2186 | break; |
2187 | case LTTNG_EVENT_SYSCALL: | |
00a62084 MD |
2188 | ret = event_kernel_enable_event(kchan, event, |
2189 | filter_expression, filter); | |
a969e101 MD |
2190 | /* We have passed ownership */ |
2191 | filter_expression = NULL; | |
2192 | filter = NULL; | |
e2b957af MD |
2193 | if (ret != LTTNG_OK) { |
2194 | goto error; | |
2195 | } | |
6e911cad MD |
2196 | break; |
2197 | default: | |
2198 | ret = LTTNG_ERR_UNK; | |
2f77fc4b DG |
2199 | goto error; |
2200 | } | |
2201 | ||
7d268848 | 2202 | kernel_wait_quiescent(); |
2f77fc4b DG |
2203 | break; |
2204 | } | |
2205 | case LTTNG_DOMAIN_UST: | |
2206 | { | |
2207 | struct ltt_ust_channel *uchan; | |
2208 | struct ltt_ust_session *usess = session->ust_session; | |
2209 | ||
2210 | assert(usess); | |
2211 | ||
85076754 MD |
2212 | /* |
2213 | * If a non-default channel has been created in the | |
2214 | * session, explicitely require that -c chan_name needs | |
2215 | * to be provided. | |
2216 | */ | |
2217 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
2218 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
2219 | goto error; | |
2220 | } | |
2221 | ||
2f77fc4b DG |
2222 | /* Get channel from global UST domain */ |
2223 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2224 | channel_name); | |
2225 | if (uchan == NULL) { | |
2226 | /* Create default channel */ | |
0a9c6494 DG |
2227 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
2228 | usess->buffer_type); | |
2f77fc4b | 2229 | if (attr == NULL) { |
f73fabfd | 2230 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2231 | goto error; |
2232 | } | |
04c17253 MD |
2233 | if (lttng_strncpy(attr->name, channel_name, |
2234 | sizeof(attr->name))) { | |
2235 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
2236 | goto error; |
2237 | } | |
2f77fc4b | 2238 | |
714363d3 JR |
2239 | ret = cmd_enable_channel_internal( |
2240 | session, domain, attr, wpipe); | |
f73fabfd | 2241 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2242 | goto error; |
2243 | } | |
2f77fc4b DG |
2244 | |
2245 | /* Get the newly created channel reference back */ | |
2246 | uchan = trace_ust_find_channel_by_name( | |
2247 | usess->domain_global.channels, channel_name); | |
2248 | assert(uchan); | |
2249 | } | |
2250 | ||
141feb8c JG |
2251 | if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) { |
2252 | /* | |
2253 | * Don't allow users to add UST events to channels which | |
2254 | * are assigned to a userspace subdomain (JUL, Log4J, | |
2255 | * Python, etc.). | |
2256 | */ | |
2257 | ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN; | |
2258 | goto error; | |
2259 | } | |
2260 | ||
dac8e046 JG |
2261 | if (!internal_event) { |
2262 | /* | |
2263 | * Ensure the event name is not reserved for internal | |
2264 | * use. | |
2265 | */ | |
2266 | ret = validate_ust_event_name(event->name); | |
2267 | if (ret) { | |
0e270a1e | 2268 | WARN("Userspace event name %s failed validation.", |
bbcab087 | 2269 | event->name); |
dac8e046 JG |
2270 | ret = LTTNG_ERR_INVALID_EVENT_NAME; |
2271 | goto error; | |
2272 | } | |
2273 | } | |
2274 | ||
2f77fc4b | 2275 | /* At this point, the session and channel exist on the tracer */ |
6b453b5e | 2276 | ret = event_ust_enable_tracepoint(usess, uchan, event, |
88f06f15 JG |
2277 | filter_expression, filter, exclusion, |
2278 | internal_event); | |
49d21f93 MD |
2279 | /* We have passed ownership */ |
2280 | filter_expression = NULL; | |
2281 | filter = NULL; | |
2282 | exclusion = NULL; | |
94382e15 JG |
2283 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2284 | goto already_enabled; | |
2285 | } else if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2286 | goto error; |
2287 | } | |
2288 | break; | |
2289 | } | |
5cdb6027 | 2290 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 2291 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2292 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 2293 | { |
da6c3a50 | 2294 | const char *default_event_name, *default_chan_name; |
fefd409b | 2295 | struct agent *agt; |
f20baf8e DG |
2296 | struct lttng_event uevent; |
2297 | struct lttng_domain tmp_dom; | |
2298 | struct ltt_ust_session *usess = session->ust_session; | |
2299 | ||
2300 | assert(usess); | |
2301 | ||
f28f9e44 JG |
2302 | if (!agent_tracing_is_enabled()) { |
2303 | DBG("Attempted to enable an event in an agent domain but the agent thread is not running"); | |
2304 | ret = LTTNG_ERR_AGENT_TRACING_DISABLED; | |
2305 | goto error; | |
2306 | } | |
2307 | ||
5cdb6027 | 2308 | agt = trace_ust_find_agent(usess, domain->type); |
fefd409b | 2309 | if (!agt) { |
5cdb6027 | 2310 | agt = agent_create(domain->type); |
fefd409b | 2311 | if (!agt) { |
e5b3c48c | 2312 | ret = LTTNG_ERR_NOMEM; |
fefd409b DG |
2313 | goto error; |
2314 | } | |
2315 | agent_add(agt, usess->agents); | |
2316 | } | |
2317 | ||
022d91ba | 2318 | /* Create the default tracepoint. */ |
996de3c7 | 2319 | memset(&uevent, 0, sizeof(uevent)); |
f20baf8e DG |
2320 | uevent.type = LTTNG_EVENT_TRACEPOINT; |
2321 | uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
51755dc8 JG |
2322 | default_event_name = event_get_default_agent_ust_name( |
2323 | domain->type); | |
da6c3a50 | 2324 | if (!default_event_name) { |
e5b3c48c | 2325 | ret = LTTNG_ERR_FATAL; |
da6c3a50 | 2326 | goto error; |
f43f95a9 | 2327 | } |
da6c3a50 | 2328 | strncpy(uevent.name, default_event_name, sizeof(uevent.name)); |
f20baf8e DG |
2329 | uevent.name[sizeof(uevent.name) - 1] = '\0'; |
2330 | ||
2331 | /* | |
2332 | * The domain type is changed because we are about to enable the | |
2333 | * default channel and event for the JUL domain that are hardcoded. | |
2334 | * This happens in the UST domain. | |
2335 | */ | |
2336 | memcpy(&tmp_dom, domain, sizeof(tmp_dom)); | |
2337 | tmp_dom.type = LTTNG_DOMAIN_UST; | |
2338 | ||
0e115563 DG |
2339 | switch (domain->type) { |
2340 | case LTTNG_DOMAIN_LOG4J: | |
da6c3a50 | 2341 | default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME; |
0e115563 DG |
2342 | break; |
2343 | case LTTNG_DOMAIN_JUL: | |
da6c3a50 | 2344 | default_chan_name = DEFAULT_JUL_CHANNEL_NAME; |
0e115563 DG |
2345 | break; |
2346 | case LTTNG_DOMAIN_PYTHON: | |
2347 | default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
2348 | break; | |
2349 | default: | |
e98a44b0 | 2350 | /* The switch/case we are in makes this impossible */ |
0e115563 | 2351 | assert(0); |
da6c3a50 DG |
2352 | } |
2353 | ||
971da06a | 2354 | { |
8404118c | 2355 | char *filter_expression_copy = NULL; |
2b00d462 | 2356 | struct lttng_bytecode *filter_copy = NULL; |
971da06a JG |
2357 | |
2358 | if (filter) { | |
51755dc8 | 2359 | const size_t filter_size = sizeof( |
2b00d462 | 2360 | struct lttng_bytecode) |
51755dc8 JG |
2361 | + filter->len; |
2362 | ||
2363 | filter_copy = zmalloc(filter_size); | |
971da06a | 2364 | if (!filter_copy) { |
018096a4 | 2365 | ret = LTTNG_ERR_NOMEM; |
b742e3e2 | 2366 | goto error; |
971da06a | 2367 | } |
51755dc8 | 2368 | memcpy(filter_copy, filter, filter_size); |
971da06a | 2369 | |
8404118c JG |
2370 | filter_expression_copy = |
2371 | strdup(filter_expression); | |
2372 | if (!filter_expression) { | |
2373 | ret = LTTNG_ERR_NOMEM; | |
51755dc8 JG |
2374 | } |
2375 | ||
2376 | if (!filter_expression_copy || !filter_copy) { | |
2377 | free(filter_expression_copy); | |
2378 | free(filter_copy); | |
2379 | goto error; | |
8404118c | 2380 | } |
971da06a JG |
2381 | } |
2382 | ||
88f06f15 | 2383 | ret = cmd_enable_event_internal(session, &tmp_dom, |
971da06a | 2384 | (char *) default_chan_name, |
8404118c JG |
2385 | &uevent, filter_expression_copy, |
2386 | filter_copy, NULL, wpipe); | |
971da06a JG |
2387 | } |
2388 | ||
94382e15 JG |
2389 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2390 | goto already_enabled; | |
2391 | } else if (ret != LTTNG_OK) { | |
f20baf8e DG |
2392 | goto error; |
2393 | } | |
2394 | ||
2395 | /* The wild card * means that everything should be enabled. */ | |
2396 | if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) { | |
8404118c JG |
2397 | ret = event_agent_enable_all(usess, agt, event, filter, |
2398 | filter_expression); | |
f20baf8e | 2399 | } else { |
8404118c JG |
2400 | ret = event_agent_enable(usess, agt, event, filter, |
2401 | filter_expression); | |
f20baf8e | 2402 | } |
51755dc8 JG |
2403 | filter = NULL; |
2404 | filter_expression = NULL; | |
f20baf8e DG |
2405 | if (ret != LTTNG_OK) { |
2406 | goto error; | |
2407 | } | |
2408 | ||
2409 | break; | |
2410 | } | |
2f77fc4b | 2411 | default: |
f73fabfd | 2412 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2413 | goto error; |
2414 | } | |
2415 | ||
f73fabfd | 2416 | ret = LTTNG_OK; |
2f77fc4b | 2417 | |
94382e15 | 2418 | already_enabled: |
2f77fc4b | 2419 | error: |
49d21f93 MD |
2420 | free(filter_expression); |
2421 | free(filter); | |
2422 | free(exclusion); | |
cf0bcb51 | 2423 | channel_attr_destroy(attr); |
2223c96f | 2424 | rcu_read_unlock(); |
2f77fc4b DG |
2425 | return ret; |
2426 | } | |
2427 | ||
88f06f15 JG |
2428 | /* |
2429 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2430 | * We own filter, exclusion, and filter_expression. | |
2431 | */ | |
fe5e9e65 JR |
2432 | int cmd_enable_event(struct command_ctx *cmd_ctx, |
2433 | struct lttng_event *event, | |
88f06f15 | 2434 | char *filter_expression, |
88f06f15 | 2435 | struct lttng_event_exclusion *exclusion, |
fe5e9e65 | 2436 | struct lttng_bytecode *bytecode, |
88f06f15 JG |
2437 | int wpipe) |
2438 | { | |
fe5e9e65 JR |
2439 | int ret; |
2440 | /* | |
2441 | * Copied to ensure proper alignment since 'lsm' is a packed structure. | |
2442 | */ | |
2443 | const struct lttng_domain command_domain = cmd_ctx->lsm.domain; | |
2444 | ||
2445 | /* | |
2446 | * The ownership of the following parameters is transferred to | |
2447 | * _cmd_enable_event: | |
2448 | * | |
2449 | * - filter_expression, | |
2450 | * - bytecode, | |
2451 | * - exclusion | |
2452 | */ | |
2453 | ret = _cmd_enable_event(cmd_ctx->session, | |
2454 | &command_domain, | |
2455 | cmd_ctx->lsm.u.enable.channel_name, event, | |
2456 | filter_expression, bytecode, exclusion, wpipe, false); | |
2457 | filter_expression = NULL; | |
2458 | bytecode = NULL; | |
2459 | exclusion = NULL; | |
2460 | return ret; | |
88f06f15 JG |
2461 | } |
2462 | ||
2463 | /* | |
2464 | * Enable an event which is internal to LTTng. An internal should | |
2465 | * never be made visible to clients and are immune to checks such as | |
2466 | * reserved names. | |
2467 | */ | |
2468 | static int cmd_enable_event_internal(struct ltt_session *session, | |
df4f5a87 | 2469 | const struct lttng_domain *domain, |
88f06f15 JG |
2470 | char *channel_name, struct lttng_event *event, |
2471 | char *filter_expression, | |
2b00d462 | 2472 | struct lttng_bytecode *filter, |
88f06f15 JG |
2473 | struct lttng_event_exclusion *exclusion, |
2474 | int wpipe) | |
2475 | { | |
2476 | return _cmd_enable_event(session, domain, channel_name, event, | |
2477 | filter_expression, filter, exclusion, wpipe, true); | |
2478 | } | |
2479 | ||
2f77fc4b DG |
2480 | /* |
2481 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2482 | */ | |
fe5e9e65 JR |
2483 | enum lttng_error_code cmd_list_tracepoints(enum lttng_domain_type domain, |
2484 | struct lttng_payload *reply_payload) | |
2f77fc4b | 2485 | { |
fe5e9e65 | 2486 | enum lttng_error_code ret_code; |
2f77fc4b | 2487 | int ret; |
fe5e9e65 JR |
2488 | ssize_t i, nb_events = 0; |
2489 | struct lttng_event *events = NULL; | |
2490 | struct lttcomm_list_command_header reply_command_header = {}; | |
2491 | size_t reply_command_header_offset; | |
2492 | ||
2493 | assert(reply_payload); | |
2494 | ||
2495 | /* Reserve space for command reply header. */ | |
2496 | reply_command_header_offset = reply_payload->buffer.size; | |
2497 | ret = lttng_dynamic_buffer_set_size(&reply_payload->buffer, | |
2498 | reply_command_header_offset + | |
2499 | sizeof(struct lttcomm_list_command_header)); | |
2500 | if (ret) { | |
2501 | ret_code = LTTNG_ERR_NOMEM; | |
2502 | goto error; | |
2503 | } | |
2f77fc4b DG |
2504 | |
2505 | switch (domain) { | |
2506 | case LTTNG_DOMAIN_KERNEL: | |
fe5e9e65 | 2507 | nb_events = kernel_list_events(&events); |
2f77fc4b | 2508 | if (nb_events < 0) { |
fe5e9e65 | 2509 | ret_code = LTTNG_ERR_KERN_LIST_FAIL; |
2f77fc4b DG |
2510 | goto error; |
2511 | } | |
2512 | break; | |
2513 | case LTTNG_DOMAIN_UST: | |
fe5e9e65 | 2514 | nb_events = ust_app_list_events(&events); |
2f77fc4b | 2515 | if (nb_events < 0) { |
fe5e9e65 | 2516 | ret_code = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2517 | goto error; |
2518 | } | |
2519 | break; | |
5cdb6027 | 2520 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2521 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2522 | case LTTNG_DOMAIN_PYTHON: |
fe5e9e65 | 2523 | nb_events = agent_list_events(&events, domain); |
3c6a091f | 2524 | if (nb_events < 0) { |
fe5e9e65 | 2525 | ret_code = LTTNG_ERR_UST_LIST_FAIL; |
3c6a091f DG |
2526 | goto error; |
2527 | } | |
2528 | break; | |
2f77fc4b | 2529 | default: |
fe5e9e65 | 2530 | ret_code = LTTNG_ERR_UND; |
2f77fc4b DG |
2531 | goto error; |
2532 | } | |
2533 | ||
fe5e9e65 JR |
2534 | for (i = 0; i < nb_events; i++) { |
2535 | ret = lttng_event_serialize(&events[i], 0, NULL, NULL, 0, NULL, | |
2536 | reply_payload); | |
2537 | if (ret) { | |
2538 | ret_code = LTTNG_ERR_NOMEM; | |
2539 | goto error; | |
2540 | } | |
2541 | } | |
2542 | ||
2543 | if (nb_events > UINT32_MAX) { | |
2544 | ERR("Tracepoint count would overflow the tracepoint listing command's reply"); | |
2545 | ret_code = LTTNG_ERR_OVERFLOW; | |
2546 | goto error; | |
2547 | } | |
2548 | ||
2549 | /* Update command reply header. */ | |
2550 | reply_command_header.count = (uint32_t) nb_events; | |
2551 | memcpy(reply_payload->buffer.data + reply_command_header_offset, &reply_command_header, | |
2552 | sizeof(reply_command_header)); | |
2f77fc4b | 2553 | |
fe5e9e65 | 2554 | ret_code = LTTNG_OK; |
2f77fc4b | 2555 | error: |
fe5e9e65 JR |
2556 | free(events); |
2557 | return ret_code; | |
2f77fc4b DG |
2558 | } |
2559 | ||
2560 | /* | |
2561 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
2562 | */ | |
997edb99 JR |
2563 | enum lttng_error_code cmd_list_tracepoint_fields(enum lttng_domain_type domain, |
2564 | struct lttng_payload *reply) | |
2f77fc4b | 2565 | { |
997edb99 | 2566 | enum lttng_error_code ret_code; |
2f77fc4b | 2567 | int ret; |
997edb99 JR |
2568 | unsigned int i, nb_fields; |
2569 | struct lttng_event_field *fields = NULL; | |
2570 | struct lttcomm_list_command_header reply_command_header = {}; | |
2571 | size_t reply_command_header_offset; | |
2572 | ||
2573 | assert(reply); | |
2574 | ||
2575 | /* Reserve space for command reply header. */ | |
2576 | reply_command_header_offset = reply->buffer.size; | |
2577 | ret = lttng_dynamic_buffer_set_size(&reply->buffer, | |
2578 | reply_command_header_offset + | |
2579 | sizeof(struct lttcomm_list_command_header)); | |
2580 | if (ret) { | |
2581 | ret_code = LTTNG_ERR_NOMEM; | |
2582 | goto error; | |
2583 | } | |
2f77fc4b DG |
2584 | |
2585 | switch (domain) { | |
2586 | case LTTNG_DOMAIN_UST: | |
997edb99 JR |
2587 | ret = ust_app_list_event_fields(&fields); |
2588 | if (ret < 0) { | |
2589 | ret_code = LTTNG_ERR_UST_LIST_FAIL; | |
2f77fc4b DG |
2590 | goto error; |
2591 | } | |
997edb99 | 2592 | |
2f77fc4b DG |
2593 | break; |
2594 | case LTTNG_DOMAIN_KERNEL: | |
2595 | default: /* fall-through */ | |
997edb99 | 2596 | ret_code = LTTNG_ERR_UND; |
2f77fc4b DG |
2597 | goto error; |
2598 | } | |
2599 | ||
997edb99 JR |
2600 | nb_fields = ret; |
2601 | ||
2602 | for (i = 0; i < nb_fields; i++) { | |
2603 | ret = lttng_event_field_serialize(&fields[i], reply); | |
2604 | if (ret) { | |
2605 | ret_code = LTTNG_ERR_NOMEM; | |
2606 | goto error; | |
2607 | } | |
2608 | } | |
2609 | ||
2610 | if (nb_fields > UINT32_MAX) { | |
2611 | ERR("Tracepoint field count would overflow the tracepoint field listing command's reply"); | |
2612 | ret_code = LTTNG_ERR_OVERFLOW; | |
2613 | goto error; | |
2614 | } | |
2615 | ||
2616 | /* Update command reply header. */ | |
2617 | reply_command_header.count = (uint32_t) nb_fields; | |
2618 | ||
2619 | memcpy(reply->buffer.data + reply_command_header_offset, &reply_command_header, | |
2620 | sizeof(reply_command_header)); | |
2621 | ||
2622 | ret_code = LTTNG_OK; | |
2f77fc4b DG |
2623 | |
2624 | error: | |
997edb99 JR |
2625 | free(fields); |
2626 | return ret_code; | |
2f77fc4b DG |
2627 | } |
2628 | ||
fe5e9e65 JR |
2629 | enum lttng_error_code cmd_list_syscalls( |
2630 | struct lttng_payload *reply_payload) | |
834978fd | 2631 | { |
fe5e9e65 JR |
2632 | enum lttng_error_code ret_code; |
2633 | ssize_t nb_events, i; | |
2634 | int ret; | |
2635 | struct lttng_event *events = NULL; | |
2636 | struct lttcomm_list_command_header reply_command_header = {}; | |
2637 | size_t reply_command_header_offset; | |
2638 | ||
2639 | assert(reply_payload); | |
2640 | ||
2641 | /* Reserve space for command reply header. */ | |
2642 | reply_command_header_offset = reply_payload->buffer.size; | |
2643 | ret = lttng_dynamic_buffer_set_size(&reply_payload->buffer, | |
2644 | reply_command_header_offset + | |
2645 | sizeof(struct lttcomm_list_command_header)); | |
2646 | if (ret) { | |
2647 | ret_code = LTTNG_ERR_NOMEM; | |
2648 | goto end; | |
2649 | } | |
2650 | ||
2651 | nb_events = syscall_table_list(&events); | |
2652 | if (nb_events < 0) { | |
2653 | ret_code = (enum lttng_error_code) -nb_events; | |
2654 | goto end; | |
2655 | } | |
2656 | ||
2657 | for (i = 0; i < nb_events; i++) { | |
2658 | ret = lttng_event_serialize(&events[i], 0, NULL, NULL, 0, NULL, | |
2659 | reply_payload); | |
2660 | if (ret) { | |
2661 | ret_code = LTTNG_ERR_NOMEM; | |
2662 | goto end; | |
2663 | } | |
2664 | } | |
2665 | ||
2666 | if (nb_events > UINT32_MAX) { | |
2667 | ERR("Syscall count would overflow the syscall listing command's reply"); | |
2668 | ret_code = LTTNG_ERR_OVERFLOW; | |
2669 | goto end; | |
2670 | } | |
2671 | ||
2672 | /* Update command reply header. */ | |
2673 | reply_command_header.count = (uint32_t) nb_events; | |
2674 | memcpy(reply_payload->buffer.data + reply_command_header_offset, &reply_command_header, | |
2675 | sizeof(reply_command_header)); | |
2676 | ||
2677 | ret_code = LTTNG_OK; | |
2678 | end: | |
2679 | free(events); | |
2680 | return ret_code; | |
834978fd DG |
2681 | } |
2682 | ||
2f77fc4b DG |
2683 | /* |
2684 | * Command LTTNG_START_TRACE processed by the client thread. | |
a9ad0c8f MD |
2685 | * |
2686 | * Called with session mutex held. | |
2f77fc4b DG |
2687 | */ |
2688 | int cmd_start_trace(struct ltt_session *session) | |
2689 | { | |
82b69413 | 2690 | enum lttng_error_code ret; |
cde3e505 | 2691 | unsigned long nb_chan = 0; |
2f77fc4b DG |
2692 | struct ltt_kernel_session *ksession; |
2693 | struct ltt_ust_session *usess; | |
1f496244 JG |
2694 | const bool session_rotated_after_last_stop = |
2695 | session->rotated_after_last_stop; | |
b02f5986 MD |
2696 | const bool session_cleared_after_last_stop = |
2697 | session->cleared_after_last_stop; | |
2f77fc4b DG |
2698 | |
2699 | assert(session); | |
2700 | ||
2701 | /* Ease our life a bit ;) */ | |
2702 | ksession = session->kernel_session; | |
2703 | usess = session->ust_session; | |
2704 | ||
8382cf6f DG |
2705 | /* Is the session already started? */ |
2706 | if (session->active) { | |
f73fabfd | 2707 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
7a24ece3 JR |
2708 | /* Perform nothing */ |
2709 | goto end; | |
2f77fc4b DG |
2710 | } |
2711 | ||
1f496244 JG |
2712 | if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING && |
2713 | !session->current_trace_chunk) { | |
2714 | /* | |
2715 | * A rotation was launched while the session was stopped and | |
2716 | * it has not been completed yet. It is not possible to start | |
2717 | * the session since starting the session here would require a | |
2718 | * rotation from "NULL" to a new trace chunk. That rotation | |
2719 | * would overlap with the ongoing rotation, which is not | |
2720 | * supported. | |
2721 | */ | |
2722 | WARN("Refusing to start session \"%s\" as a rotation launched after the last \"stop\" is still ongoing", | |
2723 | session->name); | |
2724 | ret = LTTNG_ERR_ROTATION_PENDING; | |
2725 | goto error; | |
2726 | } | |
2727 | ||
cde3e505 DG |
2728 | /* |
2729 | * Starting a session without channel is useless since after that it's not | |
2730 | * possible to enable channel thus inform the client. | |
2731 | */ | |
2732 | if (usess && usess->domain_global.channels) { | |
2733 | nb_chan += lttng_ht_get_count(usess->domain_global.channels); | |
2734 | } | |
2735 | if (ksession) { | |
2736 | nb_chan += ksession->channel_count; | |
2737 | } | |
2738 | if (!nb_chan) { | |
2739 | ret = LTTNG_ERR_NO_CHANNEL; | |
2740 | goto error; | |
2741 | } | |
2742 | ||
1f496244 JG |
2743 | session->active = 1; |
2744 | session->rotated_after_last_stop = false; | |
b02f5986 | 2745 | session->cleared_after_last_stop = false; |
070b6a86 | 2746 | if (session->output_traces && !session->current_trace_chunk) { |
1f496244 JG |
2747 | if (!session->has_been_started) { |
2748 | struct lttng_trace_chunk *trace_chunk; | |
2749 | ||
2750 | DBG("Creating initial trace chunk of session \"%s\"", | |
2751 | session->name); | |
2752 | trace_chunk = session_create_new_trace_chunk( | |
2753 | session, NULL, NULL, NULL); | |
2754 | if (!trace_chunk) { | |
2755 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
2756 | goto error; | |
2757 | } | |
2758 | assert(!session->current_trace_chunk); | |
2759 | ret = session_set_trace_chunk(session, trace_chunk, | |
2760 | NULL); | |
2761 | lttng_trace_chunk_put(trace_chunk); | |
2762 | if (ret) { | |
2763 | ret = LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER; | |
2764 | goto error; | |
2765 | } | |
2766 | } else { | |
2767 | DBG("Rotating session \"%s\" from its current \"NULL\" trace chunk to a new chunk", | |
2768 | session->name); | |
2769 | /* | |
2770 | * Rotate existing streams into the new chunk. | |
2771 | * This is a "quiet" rotation has no client has | |
2772 | * explicitly requested this operation. | |
2773 | * | |
2774 | * There is also no need to wait for the rotation | |
2775 | * to complete as it will happen immediately. No data | |
2776 | * was produced as the session was stopped, so the | |
2777 | * rotation should happen on reception of the command. | |
2778 | */ | |
343defc2 MD |
2779 | ret = cmd_rotate_session(session, NULL, true, |
2780 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION); | |
1f496244 JG |
2781 | if (ret != LTTNG_OK) { |
2782 | goto error; | |
2783 | } | |
5c408ad8 | 2784 | } |
c996624c JD |
2785 | } |
2786 | ||
2f77fc4b DG |
2787 | /* Kernel tracing */ |
2788 | if (ksession != NULL) { | |
c996624c | 2789 | DBG("Start kernel tracing session %s", session->name); |
7d268848 | 2790 | ret = start_kernel_session(ksession); |
9b6c7ec5 | 2791 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2792 | goto error; |
2793 | } | |
2f77fc4b DG |
2794 | } |
2795 | ||
2796 | /* Flag session that trace should start automatically */ | |
2797 | if (usess) { | |
82b69413 JG |
2798 | int int_ret = ust_app_start_trace_all(usess); |
2799 | ||
2800 | if (int_ret < 0) { | |
f73fabfd | 2801 | ret = LTTNG_ERR_UST_START_FAIL; |
2f77fc4b DG |
2802 | goto error; |
2803 | } | |
2804 | } | |
2805 | ||
04ed9e10 JG |
2806 | /* |
2807 | * Open a packet in every stream of the session to ensure that viewers | |
2808 | * can correctly identify the boundaries of the periods during which | |
2809 | * tracing was active for this session. | |
2810 | */ | |
2811 | ret = session_open_packets(session); | |
2812 | if (ret != LTTNG_OK) { | |
2813 | goto error; | |
2814 | } | |
2815 | ||
5c408ad8 JD |
2816 | /* |
2817 | * Clear the flag that indicates that a rotation was done while the | |
2818 | * session was stopped. | |
2819 | */ | |
2820 | session->rotated_after_last_stop = false; | |
2821 | ||
259c2674 | 2822 | if (session->rotate_timer_period) { |
82b69413 JG |
2823 | int int_ret = timer_session_rotation_schedule_timer_start( |
2824 | session, session->rotate_timer_period); | |
2825 | ||
2826 | if (int_ret < 0) { | |
259c2674 JD |
2827 | ERR("Failed to enable rotate timer"); |
2828 | ret = LTTNG_ERR_UNK; | |
2829 | goto error; | |
2830 | } | |
2831 | } | |
2832 | ||
f73fabfd | 2833 | ret = LTTNG_OK; |
2f77fc4b DG |
2834 | |
2835 | error: | |
1f496244 JG |
2836 | if (ret == LTTNG_OK) { |
2837 | /* Flag this after a successful start. */ | |
2838 | session->has_been_started |= 1; | |
2839 | } else { | |
2840 | session->active = 0; | |
2841 | /* Restore initial state on error. */ | |
2842 | session->rotated_after_last_stop = | |
2843 | session_rotated_after_last_stop; | |
b02f5986 MD |
2844 | session->cleared_after_last_stop = |
2845 | session_cleared_after_last_stop; | |
1f496244 | 2846 | } |
7a24ece3 | 2847 | end: |
2f77fc4b DG |
2848 | return ret; |
2849 | } | |
2850 | ||
2851 | /* | |
2852 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2853 | */ | |
2854 | int cmd_stop_trace(struct ltt_session *session) | |
2855 | { | |
2856 | int ret; | |
2f77fc4b DG |
2857 | struct ltt_kernel_session *ksession; |
2858 | struct ltt_ust_session *usess; | |
2859 | ||
2860 | assert(session); | |
2861 | ||
4dbe1875 | 2862 | DBG("Begin stop session \"%s\" (id %" PRIu64 ")", session->name, session->id); |
2f77fc4b DG |
2863 | /* Short cut */ |
2864 | ksession = session->kernel_session; | |
2865 | usess = session->ust_session; | |
2866 | ||
8382cf6f DG |
2867 | /* Session is not active. Skip everythong and inform the client. */ |
2868 | if (!session->active) { | |
f73fabfd | 2869 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
2f77fc4b DG |
2870 | goto error; |
2871 | } | |
2872 | ||
4dbe1875 MD |
2873 | ret = stop_kernel_session(ksession); |
2874 | if (ret != LTTNG_OK) { | |
2875 | goto error; | |
2f77fc4b DG |
2876 | } |
2877 | ||
14fb1ebe | 2878 | if (usess && usess->active) { |
2f77fc4b DG |
2879 | ret = ust_app_stop_trace_all(usess); |
2880 | if (ret < 0) { | |
f73fabfd | 2881 | ret = LTTNG_ERR_UST_STOP_FAIL; |
2f77fc4b DG |
2882 | goto error; |
2883 | } | |
2884 | } | |
2885 | ||
4dbe1875 MD |
2886 | DBG("Completed stop session \"%s\" (id %" PRIu64 ")", session->name, |
2887 | session->id); | |
8382cf6f DG |
2888 | /* Flag inactive after a successful stop. */ |
2889 | session->active = 0; | |
4dbe1875 | 2890 | ret = LTTNG_OK; |
2f77fc4b DG |
2891 | |
2892 | error: | |
2893 | return ret; | |
2894 | } | |
2895 | ||
2896 | /* | |
433f5ba9 JR |
2897 | * Set the base_path of the session only if subdir of a control uris is set. |
2898 | * Return LTTNG_OK on success, otherwise LTTNG_ERR_*. | |
2f77fc4b | 2899 | */ |
433f5ba9 JR |
2900 | static int set_session_base_path_from_uris(struct ltt_session *session, |
2901 | size_t nb_uri, | |
bda32d56 | 2902 | struct lttng_uri *uris) |
2f77fc4b | 2903 | { |
433f5ba9 JR |
2904 | int ret; |
2905 | size_t i; | |
2f77fc4b | 2906 | |
e3876bf0 JR |
2907 | for (i = 0; i < nb_uri; i++) { |
2908 | if (uris[i].stype != LTTNG_STREAM_CONTROL || | |
2909 | uris[i].subdir[0] == '\0') { | |
2910 | /* Not interested in these URIs */ | |
2911 | continue; | |
2912 | } | |
2913 | ||
2914 | if (session->base_path != NULL) { | |
2915 | free(session->base_path); | |
2916 | session->base_path = NULL; | |
2917 | } | |
2918 | ||
2919 | /* Set session base_path */ | |
2920 | session->base_path = strdup(uris[i].subdir); | |
2921 | if (!session->base_path) { | |
433f5ba9 JR |
2922 | PERROR("Failed to copy base path \"%s\" to session \"%s\"", |
2923 | uris[i].subdir, session->name); | |
2924 | ret = LTTNG_ERR_NOMEM; | |
e3876bf0 JR |
2925 | goto error; |
2926 | } | |
433f5ba9 JR |
2927 | DBG2("Setting base path \"%s\" for session \"%s\"", |
2928 | session->base_path, session->name); | |
2929 | } | |
2930 | ret = LTTNG_OK; | |
2931 | error: | |
2932 | return ret; | |
2933 | } | |
2934 | ||
2935 | /* | |
2936 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
2937 | */ | |
2938 | int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri, | |
2939 | struct lttng_uri *uris) | |
2940 | { | |
2941 | int ret, i; | |
2942 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2943 | struct ltt_ust_session *usess = session->ust_session; | |
2944 | ||
2945 | assert(session); | |
2946 | assert(uris); | |
2947 | assert(nb_uri > 0); | |
2948 | ||
2949 | /* Can't set consumer URI if the session is active. */ | |
2950 | if (session->active) { | |
2951 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; | |
2952 | goto error; | |
2953 | } | |
2954 | ||
2955 | /* | |
2956 | * Set the session base path if any. This is done inside | |
2957 | * cmd_set_consumer_uri to preserve backward compatibility of the | |
2958 | * previous session creation api vs the session descriptor api. | |
2959 | */ | |
2960 | ret = set_session_base_path_from_uris(session, nb_uri, uris); | |
2961 | if (ret != LTTNG_OK) { | |
2962 | goto error; | |
e3876bf0 JR |
2963 | } |
2964 | ||
bda32d56 | 2965 | /* Set the "global" consumer URIs */ |
2f77fc4b | 2966 | for (i = 0; i < nb_uri; i++) { |
e3876bf0 JR |
2967 | ret = add_uri_to_consumer(session, session->consumer, &uris[i], |
2968 | LTTNG_DOMAIN_NONE); | |
a74934ba | 2969 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2970 | goto error; |
2971 | } | |
2f77fc4b DG |
2972 | } |
2973 | ||
bda32d56 JG |
2974 | /* Set UST session URIs */ |
2975 | if (session->ust_session) { | |
2976 | for (i = 0; i < nb_uri; i++) { | |
b178f53e | 2977 | ret = add_uri_to_consumer(session, |
bda32d56 | 2978 | session->ust_session->consumer, |
b178f53e | 2979 | &uris[i], LTTNG_DOMAIN_UST); |
bda32d56 JG |
2980 | if (ret != LTTNG_OK) { |
2981 | goto error; | |
2982 | } | |
2983 | } | |
2984 | } | |
2985 | ||
2986 | /* Set kernel session URIs */ | |
2987 | if (session->kernel_session) { | |
2988 | for (i = 0; i < nb_uri; i++) { | |
b178f53e | 2989 | ret = add_uri_to_consumer(session, |
bda32d56 | 2990 | session->kernel_session->consumer, |
b178f53e | 2991 | &uris[i], LTTNG_DOMAIN_KERNEL); |
bda32d56 JG |
2992 | if (ret != LTTNG_OK) { |
2993 | goto error; | |
2994 | } | |
2995 | } | |
2996 | } | |
2997 | ||
7ab70fe0 DG |
2998 | /* |
2999 | * Make sure to set the session in output mode after we set URI since a | |
3000 | * session can be created without URL (thus flagged in no output mode). | |
3001 | */ | |
3002 | session->output_traces = 1; | |
3003 | if (ksess) { | |
3004 | ksess->output_traces = 1; | |
bda32d56 JG |
3005 | } |
3006 | ||
3007 | if (usess) { | |
7ab70fe0 DG |
3008 | usess->output_traces = 1; |
3009 | } | |
3010 | ||
2f77fc4b | 3011 | /* All good! */ |
f73fabfd | 3012 | ret = LTTNG_OK; |
2f77fc4b DG |
3013 | |
3014 | error: | |
3015 | return ret; | |
3016 | } | |
3017 | ||
b178f53e JG |
3018 | static |
3019 | enum lttng_error_code set_session_output_from_descriptor( | |
3020 | struct ltt_session *session, | |
3021 | const struct lttng_session_descriptor *descriptor) | |
2f77fc4b DG |
3022 | { |
3023 | int ret; | |
b178f53e JG |
3024 | enum lttng_error_code ret_code = LTTNG_OK; |
3025 | enum lttng_session_descriptor_type session_type = | |
3026 | lttng_session_descriptor_get_type(descriptor); | |
3027 | enum lttng_session_descriptor_output_type output_type = | |
3028 | lttng_session_descriptor_get_output_type(descriptor); | |
3029 | struct lttng_uri uris[2] = {}; | |
3030 | size_t uri_count = 0; | |
3031 | ||
3032 | switch (output_type) { | |
3033 | case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NONE: | |
3034 | goto end; | |
3035 | case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_LOCAL: | |
3036 | lttng_session_descriptor_get_local_output_uri(descriptor, | |
3037 | &uris[0]); | |
3038 | uri_count = 1; | |
3039 | break; | |
3040 | case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NETWORK: | |
3041 | lttng_session_descriptor_get_network_output_uris(descriptor, | |
3042 | &uris[0], &uris[1]); | |
3043 | uri_count = 2; | |
3044 | break; | |
3045 | default: | |
3046 | ret_code = LTTNG_ERR_INVALID; | |
e32d7f27 | 3047 | goto end; |
2f77fc4b DG |
3048 | } |
3049 | ||
b178f53e JG |
3050 | switch (session_type) { |
3051 | case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT: | |
3052 | { | |
3053 | struct snapshot_output *new_output = NULL; | |
3054 | ||
3055 | new_output = snapshot_output_alloc(); | |
3056 | if (!new_output) { | |
3057 | ret_code = LTTNG_ERR_NOMEM; | |
3058 | goto end; | |
3059 | } | |
3060 | ||
3061 | ret = snapshot_output_init_with_uri(session, | |
3062 | DEFAULT_SNAPSHOT_MAX_SIZE, | |
3063 | NULL, uris, uri_count, session->consumer, | |
3064 | new_output, &session->snapshot); | |
3065 | if (ret < 0) { | |
3066 | ret_code = (ret == -ENOMEM) ? | |
3067 | LTTNG_ERR_NOMEM : LTTNG_ERR_INVALID; | |
3068 | snapshot_output_destroy(new_output); | |
3069 | goto end; | |
3070 | } | |
3071 | snapshot_add_output(&session->snapshot, new_output); | |
3072 | break; | |
3073 | } | |
3074 | case LTTNG_SESSION_DESCRIPTOR_TYPE_REGULAR: | |
3075 | case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE: | |
3076 | { | |
3077 | ret_code = cmd_set_consumer_uri(session, uri_count, uris); | |
3078 | break; | |
3079 | } | |
3080 | default: | |
3081 | ret_code = LTTNG_ERR_INVALID; | |
e32d7f27 | 3082 | goto end; |
2f77fc4b | 3083 | } |
b178f53e JG |
3084 | end: |
3085 | return ret_code; | |
3086 | } | |
3087 | ||
3088 | static | |
3089 | enum lttng_error_code cmd_create_session_from_descriptor( | |
3090 | struct lttng_session_descriptor *descriptor, | |
3091 | const lttng_sock_cred *creds, | |
3092 | const char *home_path) | |
3093 | { | |
3094 | int ret; | |
3095 | enum lttng_error_code ret_code; | |
3096 | const char *session_name; | |
3097 | struct ltt_session *new_session = NULL; | |
3098 | enum lttng_session_descriptor_status descriptor_status; | |
2f77fc4b | 3099 | |
e32d7f27 | 3100 | session_lock_list(); |
b178f53e JG |
3101 | if (home_path) { |
3102 | if (*home_path != '/') { | |
3103 | ERR("Home path provided by client is not absolute"); | |
3104 | ret_code = LTTNG_ERR_INVALID; | |
3105 | goto end; | |
3106 | } | |
3107 | } | |
2f77fc4b | 3108 | |
b178f53e JG |
3109 | descriptor_status = lttng_session_descriptor_get_session_name( |
3110 | descriptor, &session_name); | |
3111 | switch (descriptor_status) { | |
3112 | case LTTNG_SESSION_DESCRIPTOR_STATUS_OK: | |
3113 | break; | |
3114 | case LTTNG_SESSION_DESCRIPTOR_STATUS_UNSET: | |
3115 | session_name = NULL; | |
3116 | break; | |
3117 | default: | |
3118 | ret_code = LTTNG_ERR_INVALID; | |
3119 | goto end; | |
3120 | } | |
e3876bf0 | 3121 | |
b178f53e | 3122 | ret_code = session_create(session_name, creds->uid, creds->gid, |
e3876bf0 | 3123 | &new_session); |
b178f53e | 3124 | if (ret_code != LTTNG_OK) { |
e32d7f27 | 3125 | goto end; |
2f77fc4b DG |
3126 | } |
3127 | ||
b178f53e JG |
3128 | if (!session_name) { |
3129 | ret = lttng_session_descriptor_set_session_name(descriptor, | |
3130 | new_session->name); | |
3131 | if (ret) { | |
3132 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
3133 | goto end; | |
3134 | } | |
3135 | } | |
3136 | ||
3137 | if (!lttng_session_descriptor_is_output_destination_initialized( | |
3138 | descriptor)) { | |
3139 | /* | |
3140 | * Only include the session's creation time in the output | |
3141 | * destination if the name of the session itself was | |
3142 | * not auto-generated. | |
3143 | */ | |
3144 | ret_code = lttng_session_descriptor_set_default_output( | |
3145 | descriptor, | |
3146 | session_name ? &new_session->creation_time : NULL, | |
3147 | home_path); | |
3148 | if (ret_code != LTTNG_OK) { | |
e32d7f27 | 3149 | goto end; |
2bba9e53 | 3150 | } |
2bba9e53 | 3151 | } else { |
b178f53e JG |
3152 | new_session->has_user_specified_directory = |
3153 | lttng_session_descriptor_has_output_directory( | |
3154 | descriptor); | |
2f77fc4b DG |
3155 | } |
3156 | ||
b178f53e JG |
3157 | switch (lttng_session_descriptor_get_type(descriptor)) { |
3158 | case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT: | |
3159 | new_session->snapshot_mode = 1; | |
3160 | break; | |
3161 | case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE: | |
3162 | new_session->live_timer = | |
3163 | lttng_session_descriptor_live_get_timer_interval( | |
3164 | descriptor); | |
3165 | break; | |
3166 | default: | |
3167 | break; | |
3168 | } | |
2f77fc4b | 3169 | |
b178f53e JG |
3170 | ret_code = set_session_output_from_descriptor(new_session, descriptor); |
3171 | if (ret_code != LTTNG_OK) { | |
3172 | goto end; | |
3173 | } | |
3174 | new_session->consumer->enabled = 1; | |
3175 | ret_code = LTTNG_OK; | |
e32d7f27 | 3176 | end: |
b178f53e JG |
3177 | /* Release reference provided by the session_create function. */ |
3178 | session_put(new_session); | |
3179 | if (ret_code != LTTNG_OK && new_session) { | |
3180 | /* Release the global reference on error. */ | |
3181 | session_destroy(new_session); | |
e32d7f27 | 3182 | } |
b178f53e JG |
3183 | session_unlock_list(); |
3184 | return ret_code; | |
2f77fc4b DG |
3185 | } |
3186 | ||
b178f53e JG |
3187 | enum lttng_error_code cmd_create_session(struct command_ctx *cmd_ctx, int sock, |
3188 | struct lttng_session_descriptor **return_descriptor) | |
27babd3a DG |
3189 | { |
3190 | int ret; | |
b178f53e JG |
3191 | size_t payload_size; |
3192 | struct lttng_dynamic_buffer payload; | |
3193 | struct lttng_buffer_view home_dir_view; | |
3194 | struct lttng_buffer_view session_descriptor_view; | |
3195 | struct lttng_session_descriptor *session_descriptor = NULL; | |
3196 | enum lttng_error_code ret_code; | |
3197 | ||
3198 | lttng_dynamic_buffer_init(&payload); | |
3a91de3a | 3199 | if (cmd_ctx->lsm.u.create_session.home_dir_size >= |
b178f53e JG |
3200 | LTTNG_PATH_MAX) { |
3201 | ret_code = LTTNG_ERR_INVALID; | |
3202 | goto error; | |
27babd3a | 3203 | } |
3a91de3a | 3204 | if (cmd_ctx->lsm.u.create_session.session_descriptor_size > |
b178f53e JG |
3205 | LTTNG_SESSION_DESCRIPTOR_MAX_LEN) { |
3206 | ret_code = LTTNG_ERR_INVALID; | |
3207 | goto error; | |
27babd3a DG |
3208 | } |
3209 | ||
3a91de3a JG |
3210 | payload_size = cmd_ctx->lsm.u.create_session.home_dir_size + |
3211 | cmd_ctx->lsm.u.create_session.session_descriptor_size; | |
b178f53e JG |
3212 | ret = lttng_dynamic_buffer_set_size(&payload, payload_size); |
3213 | if (ret) { | |
3214 | ret_code = LTTNG_ERR_NOMEM; | |
3215 | goto error; | |
27babd3a DG |
3216 | } |
3217 | ||
b178f53e JG |
3218 | ret = lttcomm_recv_unix_sock(sock, payload.data, payload.size); |
3219 | if (ret <= 0) { | |
3220 | ERR("Reception of session descriptor failed, aborting."); | |
3221 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
3222 | goto error; | |
27babd3a DG |
3223 | } |
3224 | ||
b178f53e JG |
3225 | home_dir_view = lttng_buffer_view_from_dynamic_buffer( |
3226 | &payload, | |
3227 | 0, | |
3a91de3a | 3228 | cmd_ctx->lsm.u.create_session.home_dir_size); |
3e6e0df2 JG |
3229 | if (cmd_ctx->lsm.u.create_session.home_dir_size > 0 && |
3230 | !lttng_buffer_view_is_valid(&home_dir_view)) { | |
3231 | ERR("Invalid payload in \"create session\" command: buffer too short to contain home directory"); | |
3232 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; | |
3233 | goto error; | |
3234 | } | |
3235 | ||
b178f53e JG |
3236 | session_descriptor_view = lttng_buffer_view_from_dynamic_buffer( |
3237 | &payload, | |
3a91de3a JG |
3238 | cmd_ctx->lsm.u.create_session.home_dir_size, |
3239 | cmd_ctx->lsm.u.create_session.session_descriptor_size); | |
3e6e0df2 JG |
3240 | if (!lttng_buffer_view_is_valid(&session_descriptor_view)) { |
3241 | ERR("Invalid payload in \"create session\" command: buffer too short to contain session descriptor"); | |
3242 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; | |
3243 | goto error; | |
3244 | } | |
27babd3a | 3245 | |
b178f53e JG |
3246 | ret = lttng_session_descriptor_create_from_buffer( |
3247 | &session_descriptor_view, &session_descriptor); | |
3248 | if (ret < 0) { | |
3249 | ERR("Failed to create session descriptor from payload of \"create session\" command"); | |
3250 | ret_code = LTTNG_ERR_INVALID; | |
3251 | goto error; | |
3252 | } | |
27babd3a | 3253 | |
b178f53e JG |
3254 | /* |
3255 | * Sets the descriptor's auto-generated properties (name, output) if | |
3256 | * needed. | |
3257 | */ | |
3258 | ret_code = cmd_create_session_from_descriptor(session_descriptor, | |
3259 | &cmd_ctx->creds, | |
3260 | home_dir_view.size ? home_dir_view.data : NULL); | |
3261 | if (ret_code != LTTNG_OK) { | |
3262 | goto error; | |
e32d7f27 | 3263 | } |
b178f53e JG |
3264 | |
3265 | ret_code = LTTNG_OK; | |
3266 | *return_descriptor = session_descriptor; | |
3267 | session_descriptor = NULL; | |
3268 | error: | |
3269 | lttng_dynamic_buffer_reset(&payload); | |
3270 | lttng_session_descriptor_destroy(session_descriptor); | |
3271 | return ret_code; | |
27babd3a DG |
3272 | } |
3273 | ||
3e3665b8 JG |
3274 | static |
3275 | void cmd_destroy_session_reply(const struct ltt_session *session, | |
3276 | void *_reply_context) | |
3277 | { | |
3278 | int ret; | |
3279 | ssize_t comm_ret; | |
3280 | const struct cmd_destroy_session_reply_context *reply_context = | |
3281 | _reply_context; | |
3282 | struct lttng_dynamic_buffer payload; | |
3283 | struct lttcomm_session_destroy_command_header cmd_header; | |
3284 | struct lttng_trace_archive_location *location = NULL; | |
3285 | struct lttcomm_lttng_msg llm = { | |
3286 | .cmd_type = LTTNG_DESTROY_SESSION, | |
3285a971 | 3287 | .ret_code = reply_context->destruction_status, |
3e3665b8 JG |
3288 | .pid = UINT32_MAX, |
3289 | .cmd_header_size = | |
3290 | sizeof(struct lttcomm_session_destroy_command_header), | |
3291 | .data_size = 0, | |
3292 | }; | |
3293 | size_t payload_size_before_location; | |
3294 | ||
3295 | lttng_dynamic_buffer_init(&payload); | |
3296 | ||
3297 | ret = lttng_dynamic_buffer_append(&payload, &llm, sizeof(llm)); | |
0e270a1e | 3298 | if (ret) { |
3e3665b8 JG |
3299 | ERR("Failed to append session destruction message"); |
3300 | goto error; | |
0e270a1e | 3301 | } |
3e3665b8 JG |
3302 | |
3303 | cmd_header.rotation_state = | |
3304 | (int32_t) (reply_context->implicit_rotation_on_destroy ? | |
3305 | session->rotation_state : | |
3306 | LTTNG_ROTATION_STATE_NO_ROTATION); | |
3307 | ret = lttng_dynamic_buffer_append(&payload, &cmd_header, | |
3308 | sizeof(cmd_header)); | |
3309 | if (ret) { | |
3310 | ERR("Failed to append session destruction command header"); | |
3311 | goto error; | |
3312 | } | |
3313 | ||
3314 | if (!reply_context->implicit_rotation_on_destroy) { | |
3315 | DBG("No implicit rotation performed during the destruction of session \"%s\", sending reply", | |
3316 | session->name); | |
3317 | goto send_reply; | |
3318 | } | |
3319 | if (session->rotation_state != LTTNG_ROTATION_STATE_COMPLETED) { | |
3320 | DBG("Rotation state of session \"%s\" is not \"completed\", sending session destruction reply", | |
3321 | session->name); | |
3322 | goto send_reply; | |
3323 | } | |
3324 | ||
3325 | location = session_get_trace_archive_location(session); | |
3326 | if (!location) { | |
3327 | ERR("Failed to get the location of the trace archive produced during the destruction of session \"%s\"", | |
3328 | session->name); | |
3329 | goto error; | |
3330 | } | |
3331 | ||
3332 | payload_size_before_location = payload.size; | |
3333 | comm_ret = lttng_trace_archive_location_serialize(location, | |
3334 | &payload); | |
ddbee47f | 3335 | lttng_trace_archive_location_put(location); |
3e3665b8 JG |
3336 | if (comm_ret < 0) { |
3337 | ERR("Failed to serialize the location of the trace archive produced during the destruction of session \"%s\"", | |
3338 | session->name); | |
3339 | goto error; | |
3340 | } | |
3341 | /* Update the message to indicate the location's length. */ | |
3342 | ((struct lttcomm_lttng_msg *) payload.data)->data_size = | |
3343 | payload.size - payload_size_before_location; | |
3344 | send_reply: | |
3345 | comm_ret = lttcomm_send_unix_sock(reply_context->reply_sock_fd, | |
3346 | payload.data, payload.size); | |
3347 | if (comm_ret != (ssize_t) payload.size) { | |
3348 | ERR("Failed to send result of the destruction of session \"%s\" to client", | |
3349 | session->name); | |
3350 | } | |
3351 | error: | |
3352 | ret = close(reply_context->reply_sock_fd); | |
3353 | if (ret) { | |
3354 | PERROR("Failed to close client socket in deferred session destroy reply"); | |
3355 | } | |
3356 | lttng_dynamic_buffer_reset(&payload); | |
3357 | free(_reply_context); | |
3358 | } | |
3359 | ||
2f77fc4b DG |
3360 | /* |
3361 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
a9ad0c8f MD |
3362 | * |
3363 | * Called with session lock held. | |
2f77fc4b | 3364 | */ |
e32d7f27 | 3365 | int cmd_destroy_session(struct ltt_session *session, |
3e3665b8 JG |
3366 | struct notification_thread_handle *notification_thread_handle, |
3367 | int *sock_fd) | |
2f77fc4b DG |
3368 | { |
3369 | int ret; | |
3285a971 | 3370 | enum lttng_error_code destruction_last_error = LTTNG_OK; |
3e3665b8 JG |
3371 | struct cmd_destroy_session_reply_context *reply_context = NULL; |
3372 | ||
3373 | if (sock_fd) { | |
3374 | reply_context = zmalloc(sizeof(*reply_context)); | |
3375 | if (!reply_context) { | |
3376 | ret = LTTNG_ERR_NOMEM; | |
3377 | goto end; | |
3378 | } | |
3379 | reply_context->reply_sock_fd = *sock_fd; | |
3380 | } | |
2f77fc4b DG |
3381 | |
3382 | /* Safety net */ | |
3383 | assert(session); | |
3384 | ||
3e3665b8 JG |
3385 | DBG("Begin destroy session %s (id %" PRIu64 ")", session->name, |
3386 | session->id); | |
3387 | if (session->active) { | |
3388 | DBG("Session \"%s\" is active, attempting to stop it before destroying it", | |
3389 | session->name); | |
3390 | ret = cmd_stop_trace(session); | |
3391 | if (ret != LTTNG_OK && ret != LTTNG_ERR_TRACE_ALREADY_STOPPED) { | |
3392 | /* Carry on with the destruction of the session. */ | |
3393 | ERR("Failed to stop session \"%s\" as part of its destruction: %s", | |
3394 | session->name, lttng_strerror(-ret)); | |
3285a971 | 3395 | destruction_last_error = ret; |
3e3665b8 JG |
3396 | } |
3397 | } | |
5c408ad8 | 3398 | |
92816cc3 JG |
3399 | if (session->rotation_schedule_timer_enabled) { |
3400 | if (timer_session_rotation_schedule_timer_stop( | |
3401 | session)) { | |
3402 | ERR("Failed to stop the \"rotation schedule\" timer of session %s", | |
3403 | session->name); | |
3285a971 | 3404 | destruction_last_error = LTTNG_ERR_TIMER_STOP_ERROR; |
92816cc3 | 3405 | } |
259c2674 JD |
3406 | } |
3407 | ||
90936dcf JD |
3408 | if (session->rotate_size) { |
3409 | unsubscribe_session_consumed_size_rotation(session, notification_thread_handle); | |
3410 | session->rotate_size = 0; | |
3411 | } | |
3412 | ||
a7ceb342 | 3413 | if (session->rotated && session->current_trace_chunk && session->output_traces) { |
b5893d8e JG |
3414 | /* |
3415 | * Perform a last rotation on destruction if rotations have | |
3416 | * occurred during the session's lifetime. | |
3417 | */ | |
343defc2 MD |
3418 | ret = cmd_rotate_session(session, NULL, false, |
3419 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED); | |
d2956687 JG |
3420 | if (ret != LTTNG_OK) { |
3421 | ERR("Failed to perform an implicit rotation as part of the destruction of session \"%s\": %s", | |
3422 | session->name, lttng_strerror(-ret)); | |
3285a971 | 3423 | destruction_last_error = -ret; |
124473a3 | 3424 | } |
0e270a1e | 3425 | if (reply_context) { |
3e3665b8 | 3426 | reply_context->implicit_rotation_on_destroy = true; |
0e270a1e JG |
3427 | } |
3428 | } else if (session->has_been_started && session->current_trace_chunk) { | |
7fdbed1c JG |
3429 | /* |
3430 | * The user has not triggered a session rotation. However, to | |
3431 | * ensure all data has been consumed, the session is rotated | |
3432 | * to a 'null' trace chunk before it is destroyed. | |
3433 | * | |
3434 | * This is a "quiet" rotation meaning that no notification is | |
3435 | * emitted and no renaming of the current trace chunk takes | |
3436 | * place. | |
3437 | */ | |
343defc2 MD |
3438 | ret = cmd_rotate_session(session, NULL, true, |
3439 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION); | |
53fb6336 JG |
3440 | /* |
3441 | * Rotation operations may not be supported by the kernel | |
3442 | * tracer. Hence, do not consider this implicit rotation as | |
3443 | * a session destruction error. The library has already stopped | |
3444 | * the session and waited for pending data; there is nothing | |
3445 | * left to do but complete the destruction of the session. | |
3446 | */ | |
3447 | if (ret != LTTNG_OK && | |
3448 | ret != -LTTNG_ERR_ROTATION_NOT_AVAILABLE_KERNEL) { | |
7fdbed1c | 3449 | ERR("Failed to perform a quiet rotation as part of the destruction of session \"%s\": %s", |
53fb6336 | 3450 | session->name, lttng_strerror(ret)); |
3285a971 | 3451 | destruction_last_error = -ret; |
7fdbed1c JG |
3452 | } |
3453 | } | |
5c408ad8 | 3454 | |
a503e1ef JG |
3455 | if (session->shm_path[0]) { |
3456 | /* | |
3457 | * When a session is created with an explicit shm_path, | |
3458 | * the consumer daemon will create its shared memory files | |
3459 | * at that location and will *not* unlink them. This is normal | |
3460 | * as the intention of that feature is to make it possible | |
3461 | * to retrieve the content of those files should a crash occur. | |
3462 | * | |
3463 | * To ensure the content of those files can be used, the | |
3464 | * sessiond daemon will replicate the content of the metadata | |
3465 | * cache in a metadata file. | |
3466 | * | |
3467 | * On clean-up, it is expected that the consumer daemon will | |
3468 | * unlink the shared memory files and that the session daemon | |
3469 | * will unlink the metadata file. Then, the session's directory | |
3470 | * in the shm path can be removed. | |
3471 | * | |
3472 | * Unfortunately, a flaw in the design of the sessiond's and | |
3473 | * consumerd's tear down of channels makes it impossible to | |
3474 | * determine when the sessiond _and_ the consumerd have both | |
3475 | * destroyed their representation of a channel. For one, the | |
3476 | * unlinking, close, and rmdir happen in deferred 'call_rcu' | |
3477 | * callbacks in both daemons. | |
3478 | * | |
3479 | * However, it is also impossible for the sessiond to know when | |
3480 | * the consumer daemon is done destroying its channel(s) since | |
3481 | * it occurs as a reaction to the closing of the channel's file | |
3482 | * descriptor. There is no resulting communication initiated | |
3483 | * from the consumerd to the sessiond to confirm that the | |
3484 | * operation is completed (and was successful). | |
3485 | * | |
3486 | * Until this is all fixed, the session daemon checks for the | |
3487 | * removal of the session's shm path which makes it possible | |
3488 | * to safely advertise a session as having been destroyed. | |
3489 | * | |
3490 | * Prior to this fix, it was not possible to reliably save | |
3491 | * a session making use of the --shm-path option, destroy it, | |
3492 | * and load it again. This is because the creation of the | |
3493 | * session would fail upon seeing the session's shm path | |
3494 | * already in existence. | |
3495 | * | |
3496 | * Note that none of the error paths in the check for the | |
3497 | * directory's existence return an error. This is normal | |
3498 | * as there isn't much that can be done. The session will | |
3499 | * be destroyed properly, except that we can't offer the | |
3500 | * guarantee that the same session can be re-created. | |
3501 | */ | |
3502 | current_completion_handler = &destroy_completion_handler.handler; | |
3503 | ret = lttng_strncpy(destroy_completion_handler.shm_path, | |
3504 | session->shm_path, | |
3505 | sizeof(destroy_completion_handler.shm_path)); | |
3506 | assert(!ret); | |
3507 | } | |
e32d7f27 JG |
3508 | |
3509 | /* | |
3510 | * The session is destroyed. However, note that the command context | |
3511 | * still holds a reference to the session, thus delaying its destruction | |
3512 | * _at least_ up to the point when that reference is released. | |
3513 | */ | |
3514 | session_destroy(session); | |
3e3665b8 | 3515 | if (reply_context) { |
3285a971 | 3516 | reply_context->destruction_status = destruction_last_error; |
3e3665b8 JG |
3517 | ret = session_add_destroy_notifier(session, |
3518 | cmd_destroy_session_reply, | |
3519 | (void *) reply_context); | |
3520 | if (ret) { | |
3521 | ret = LTTNG_ERR_FATAL; | |
3522 | goto end; | |
3523 | } else { | |
3524 | *sock_fd = -1; | |
3525 | } | |
0e270a1e JG |
3526 | } |
3527 | ret = LTTNG_OK; | |
3e3665b8 | 3528 | end: |
2f77fc4b DG |
3529 | return ret; |
3530 | } | |
3531 | ||
2f77fc4b DG |
3532 | /* |
3533 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
3534 | */ | |
56a37563 JG |
3535 | int cmd_register_consumer(struct ltt_session *session, |
3536 | enum lttng_domain_type domain, const char *sock_path, | |
3537 | struct consumer_data *cdata) | |
2f77fc4b DG |
3538 | { |
3539 | int ret, sock; | |
dd81b457 | 3540 | struct consumer_socket *socket = NULL; |
2f77fc4b DG |
3541 | |
3542 | assert(session); | |
3543 | assert(cdata); | |
3544 | assert(sock_path); | |
3545 | ||
3546 | switch (domain) { | |
3547 | case LTTNG_DOMAIN_KERNEL: | |
3548 | { | |
3549 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3550 | ||
3551 | assert(ksess); | |
3552 | ||
3553 | /* Can't register a consumer if there is already one */ | |
3554 | if (ksess->consumer_fds_sent != 0) { | |
f73fabfd | 3555 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
3556 | goto error; |
3557 | } | |
3558 | ||
3559 | sock = lttcomm_connect_unix_sock(sock_path); | |
3560 | if (sock < 0) { | |
f73fabfd | 3561 | ret = LTTNG_ERR_CONNECT_FAIL; |
2f77fc4b DG |
3562 | goto error; |
3563 | } | |
4ce514c4 | 3564 | cdata->cmd_sock = sock; |
2f77fc4b | 3565 | |
4ce514c4 | 3566 | socket = consumer_allocate_socket(&cdata->cmd_sock); |
2f77fc4b | 3567 | if (socket == NULL) { |
f66c074c DG |
3568 | ret = close(sock); |
3569 | if (ret < 0) { | |
3570 | PERROR("close register consumer"); | |
3571 | } | |
4ce514c4 | 3572 | cdata->cmd_sock = -1; |
f73fabfd | 3573 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
3574 | goto error; |
3575 | } | |
3576 | ||
3577 | socket->lock = zmalloc(sizeof(pthread_mutex_t)); | |
3578 | if (socket->lock == NULL) { | |
3579 | PERROR("zmalloc pthread mutex"); | |
f73fabfd | 3580 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
3581 | goto error; |
3582 | } | |
3583 | pthread_mutex_init(socket->lock, NULL); | |
3584 | socket->registered = 1; | |
3585 | ||
3586 | rcu_read_lock(); | |
3587 | consumer_add_socket(socket, ksess->consumer); | |
3588 | rcu_read_unlock(); | |
3589 | ||
3590 | pthread_mutex_lock(&cdata->pid_mutex); | |
3591 | cdata->pid = -1; | |
3592 | pthread_mutex_unlock(&cdata->pid_mutex); | |
3593 | ||
3594 | break; | |
3595 | } | |
3596 | default: | |
3597 | /* TODO: Userspace tracing */ | |
f73fabfd | 3598 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3599 | goto error; |
3600 | } | |
3601 | ||
dd81b457 | 3602 | return LTTNG_OK; |
2f77fc4b DG |
3603 | |
3604 | error: | |
dd81b457 DG |
3605 | if (socket) { |
3606 | consumer_destroy_socket(socket); | |
3607 | } | |
2f77fc4b DG |
3608 | return ret; |
3609 | } | |
3610 | ||
3611 | /* | |
3612 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
3613 | */ | |
3614 | ssize_t cmd_list_domains(struct ltt_session *session, | |
3615 | struct lttng_domain **domains) | |
3616 | { | |
3617 | int ret, index = 0; | |
3618 | ssize_t nb_dom = 0; | |
fefd409b DG |
3619 | struct agent *agt; |
3620 | struct lttng_ht_iter iter; | |
2f77fc4b DG |
3621 | |
3622 | if (session->kernel_session != NULL) { | |
3623 | DBG3("Listing domains found kernel domain"); | |
3624 | nb_dom++; | |
3625 | } | |
3626 | ||
3627 | if (session->ust_session != NULL) { | |
3628 | DBG3("Listing domains found UST global domain"); | |
3629 | nb_dom++; | |
3c6a091f | 3630 | |
e0a74f01 | 3631 | rcu_read_lock(); |
fefd409b DG |
3632 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
3633 | agt, node.node) { | |
3634 | if (agt->being_used) { | |
3635 | nb_dom++; | |
3636 | } | |
3c6a091f | 3637 | } |
e0a74f01 | 3638 | rcu_read_unlock(); |
2f77fc4b DG |
3639 | } |
3640 | ||
fa64dfb4 JG |
3641 | if (!nb_dom) { |
3642 | goto end; | |
3643 | } | |
3644 | ||
2f77fc4b DG |
3645 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
3646 | if (*domains == NULL) { | |
f73fabfd | 3647 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
3648 | goto error; |
3649 | } | |
3650 | ||
3651 | if (session->kernel_session != NULL) { | |
3652 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
b5edb9e8 PP |
3653 | |
3654 | /* Kernel session buffer type is always GLOBAL */ | |
3655 | (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL; | |
3656 | ||
2f77fc4b DG |
3657 | index++; |
3658 | } | |
3659 | ||
3660 | if (session->ust_session != NULL) { | |
3661 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
88c5f0d8 | 3662 | (*domains)[index].buf_type = session->ust_session->buffer_type; |
2f77fc4b | 3663 | index++; |
3c6a091f | 3664 | |
e0a74f01 | 3665 | rcu_read_lock(); |
fefd409b DG |
3666 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
3667 | agt, node.node) { | |
3668 | if (agt->being_used) { | |
3669 | (*domains)[index].type = agt->domain; | |
3670 | (*domains)[index].buf_type = session->ust_session->buffer_type; | |
3671 | index++; | |
3672 | } | |
3c6a091f | 3673 | } |
e0a74f01 | 3674 | rcu_read_unlock(); |
2f77fc4b | 3675 | } |
fa64dfb4 | 3676 | end: |
2f77fc4b DG |
3677 | return nb_dom; |
3678 | ||
3679 | error: | |
f73fabfd DG |
3680 | /* Return negative value to differentiate return code */ |
3681 | return -ret; | |
2f77fc4b DG |
3682 | } |
3683 | ||
3684 | ||
3685 | /* | |
3686 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
3687 | */ | |
714363d3 JR |
3688 | enum lttng_error_code cmd_list_channels(enum lttng_domain_type domain, |
3689 | struct ltt_session *session, | |
3690 | struct lttng_payload *payload) | |
2f77fc4b | 3691 | { |
714363d3 JR |
3692 | int ret = 0; |
3693 | unsigned int i = 0; | |
3694 | struct lttcomm_list_command_header cmd_header = {}; | |
3695 | size_t cmd_header_offset; | |
3696 | enum lttng_error_code ret_code; | |
3697 | ||
3698 | assert(session); | |
3699 | assert(payload); | |
3700 | ||
3701 | DBG("Listing channels for session %s", session->name); | |
3702 | ||
3703 | cmd_header_offset = payload->buffer.size; | |
3704 | ||
3705 | /* Reserve space for command reply header. */ | |
3706 | ret = lttng_dynamic_buffer_set_size(&payload->buffer, | |
3707 | cmd_header_offset + sizeof(cmd_header)); | |
3708 | if (ret) { | |
3709 | ret_code = LTTNG_ERR_NOMEM; | |
3710 | goto end; | |
3711 | } | |
2f77fc4b DG |
3712 | |
3713 | switch (domain) { | |
3714 | case LTTNG_DOMAIN_KERNEL: | |
714363d3 JR |
3715 | { |
3716 | /* Kernel channels */ | |
3717 | struct ltt_kernel_channel *kchan; | |
2f77fc4b | 3718 | if (session->kernel_session != NULL) { |
714363d3 JR |
3719 | cds_list_for_each_entry(kchan, |
3720 | &session->kernel_session->channel_list.head, list) { | |
3721 | uint64_t discarded_events, lost_packets; | |
3722 | struct lttng_channel_extended *extended; | |
3723 | ||
3724 | extended = (struct lttng_channel_extended *) | |
3725 | kchan->channel->attr.extended.ptr; | |
3726 | ||
3727 | ret = get_kernel_runtime_stats(session, kchan, | |
3728 | &discarded_events, &lost_packets); | |
3729 | if (ret < 0) { | |
3730 | ret_code = LTTNG_ERR_UNK; | |
3731 | goto end; | |
3732 | } | |
3733 | ||
3734 | /* | |
3735 | * Update the discarded_events and lost_packets | |
3736 | * count for the channel | |
3737 | */ | |
3738 | extended->discarded_events = discarded_events; | |
3739 | extended->lost_packets = lost_packets; | |
3740 | ||
3741 | ret = lttng_channel_serialize( | |
3742 | kchan->channel, &payload->buffer); | |
3743 | if (ret) { | |
3744 | ERR("Failed to serialize lttng_channel: channel name = '%s'", | |
3745 | kchan->channel->name); | |
3746 | ret_code = LTTNG_ERR_UNK; | |
3747 | goto end; | |
3748 | } | |
3749 | ||
3750 | i++; | |
3751 | } | |
c7d620a2 | 3752 | } |
2f77fc4b | 3753 | break; |
714363d3 | 3754 | } |
2f77fc4b | 3755 | case LTTNG_DOMAIN_UST: |
714363d3 JR |
3756 | { |
3757 | struct lttng_ht_iter iter; | |
3758 | struct ltt_ust_channel *uchan; | |
3759 | ||
3760 | rcu_read_lock(); | |
3761 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, | |
3762 | &iter.iter, uchan, node.node) { | |
3763 | uint64_t discarded_events = 0, lost_packets = 0; | |
3764 | struct lttng_channel *channel = NULL; | |
3765 | struct lttng_channel_extended *extended; | |
3766 | ||
3767 | channel = trace_ust_channel_to_lttng_channel(uchan); | |
3768 | if (!channel) { | |
3769 | ret = LTTNG_ERR_NOMEM; | |
3770 | break; | |
3771 | } | |
3772 | ||
3773 | extended = (struct lttng_channel_extended *) | |
3774 | channel->attr.extended.ptr; | |
3775 | ||
3776 | ret = get_ust_runtime_stats(session, uchan, | |
3777 | &discarded_events, &lost_packets); | |
3778 | if (ret < 0) { | |
3779 | lttng_channel_destroy(channel); | |
3780 | ret_code = LTTNG_ERR_UNK; | |
3781 | break; | |
3782 | } | |
3783 | ||
3784 | extended->discarded_events = discarded_events; | |
3785 | extended->lost_packets = lost_packets; | |
3786 | ||
3787 | ret = lttng_channel_serialize( | |
3788 | channel, &payload->buffer); | |
3789 | if (ret) { | |
3790 | ERR("Failed to serialize lttng_channel: channel name = '%s'", | |
3791 | channel->name); | |
3792 | ret_code = LTTNG_ERR_UNK; | |
3793 | ret = -1; | |
3794 | break; | |
3795 | } | |
3796 | ||
3797 | i++; | |
c7d620a2 | 3798 | } |
714363d3 | 3799 | rcu_read_unlock(); |
2f77fc4b | 3800 | break; |
714363d3 | 3801 | } |
2f77fc4b | 3802 | default: |
714363d3 | 3803 | break; |
2f77fc4b DG |
3804 | } |
3805 | ||
714363d3 JR |
3806 | if (i > UINT32_MAX) { |
3807 | ERR("Channel count would overflow the channel listing command's reply"); | |
3808 | ret_code = LTTNG_ERR_OVERFLOW; | |
3809 | goto end; | |
2f77fc4b DG |
3810 | } |
3811 | ||
714363d3 JR |
3812 | /* Update command reply header. */ |
3813 | cmd_header.count = (uint32_t) i; | |
3814 | memcpy(payload->buffer.data + cmd_header_offset, &cmd_header, | |
3815 | sizeof(cmd_header)); | |
3816 | ret_code = LTTNG_OK; | |
3817 | ||
53e367f9 | 3818 | end: |
714363d3 | 3819 | return ret_code; |
2f77fc4b DG |
3820 | } |
3821 | ||
3822 | /* | |
3823 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3824 | */ | |
fe5e9e65 JR |
3825 | enum lttng_error_code cmd_list_events(enum lttng_domain_type domain, |
3826 | struct ltt_session *session, | |
3827 | char *channel_name, | |
3828 | struct lttng_payload *reply_payload) | |
2f77fc4b | 3829 | { |
fe5e9e65 JR |
3830 | int buffer_resize_ret; |
3831 | enum lttng_error_code ret_code = LTTNG_OK; | |
3832 | struct lttcomm_list_command_header reply_command_header = {}; | |
3833 | size_t reply_command_header_offset; | |
3834 | unsigned int nb_events = 0; | |
e368fb43 | 3835 | |
fe5e9e65 JR |
3836 | assert(reply_payload); |
3837 | ||
3838 | /* Reserve space for command reply header. */ | |
3839 | reply_command_header_offset = reply_payload->buffer.size; | |
3840 | buffer_resize_ret = lttng_dynamic_buffer_set_size(&reply_payload->buffer, | |
3841 | reply_command_header_offset + | |
3842 | sizeof(struct lttcomm_list_command_header)); | |
3843 | if (buffer_resize_ret) { | |
3844 | ret_code = LTTNG_ERR_NOMEM; | |
3845 | goto end; | |
e368fb43 | 3846 | } |
2f77fc4b DG |
3847 | |
3848 | switch (domain) { | |
3849 | case LTTNG_DOMAIN_KERNEL: | |
3850 | if (session->kernel_session != NULL) { | |
fe5e9e65 JR |
3851 | ret_code = list_lttng_kernel_events(channel_name, |
3852 | session->kernel_session, reply_payload, &nb_events); | |
2f77fc4b | 3853 | } |
fe5e9e65 | 3854 | |
2f77fc4b DG |
3855 | break; |
3856 | case LTTNG_DOMAIN_UST: | |
3857 | { | |
3858 | if (session->ust_session != NULL) { | |
fe5e9e65 | 3859 | ret_code = list_lttng_ust_global_events(channel_name, |
e368fb43 | 3860 | &session->ust_session->domain_global, |
fe5e9e65 | 3861 | reply_payload, &nb_events); |
2f77fc4b | 3862 | } |
fe5e9e65 | 3863 | |
2f77fc4b DG |
3864 | break; |
3865 | } | |
5cdb6027 | 3866 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 3867 | case LTTNG_DOMAIN_JUL: |
0e115563 | 3868 | case LTTNG_DOMAIN_PYTHON: |
3c6a091f | 3869 | if (session->ust_session) { |
fefd409b DG |
3870 | struct lttng_ht_iter iter; |
3871 | struct agent *agt; | |
3872 | ||
b11feea5 | 3873 | rcu_read_lock(); |
fefd409b DG |
3874 | cds_lfht_for_each_entry(session->ust_session->agents->ht, |
3875 | &iter.iter, agt, node.node) { | |
1dfd9906 | 3876 | if (agt->domain == domain) { |
fe5e9e65 JR |
3877 | ret_code = list_lttng_agent_events( |
3878 | agt, reply_payload, &nb_events); | |
1dfd9906 JG |
3879 | break; |
3880 | } | |
fefd409b | 3881 | } |
fe5e9e65 | 3882 | |
b11feea5 | 3883 | rcu_read_unlock(); |
3c6a091f DG |
3884 | } |
3885 | break; | |
2f77fc4b | 3886 | default: |
fe5e9e65 JR |
3887 | ret_code = LTTNG_ERR_UND; |
3888 | break; | |
2f77fc4b DG |
3889 | } |
3890 | ||
fe5e9e65 JR |
3891 | if (nb_events > UINT32_MAX) { |
3892 | ret_code = LTTNG_ERR_OVERFLOW; | |
3893 | goto end; | |
3894 | } | |
e368fb43 | 3895 | |
fe5e9e65 JR |
3896 | /* Update command reply header. */ |
3897 | reply_command_header.count = (uint32_t) nb_events; | |
3898 | memcpy(reply_payload->buffer.data + reply_command_header_offset, &reply_command_header, | |
3899 | sizeof(reply_command_header)); | |
2f77fc4b | 3900 | |
fe5e9e65 JR |
3901 | end: |
3902 | return ret_code; | |
2f77fc4b DG |
3903 | } |
3904 | ||
3905 | /* | |
3906 | * Using the session list, filled a lttng_session array to send back to the | |
3907 | * client for session listing. | |
3908 | * | |
3909 | * The session list lock MUST be acquired before calling this function. Use | |
3910 | * session_lock_list() and session_unlock_list(). | |
3911 | */ | |
b178f53e JG |
3912 | void cmd_list_lttng_sessions(struct lttng_session *sessions, |
3913 | size_t session_count, uid_t uid, gid_t gid) | |
2f77fc4b DG |
3914 | { |
3915 | int ret; | |
3916 | unsigned int i = 0; | |
3917 | struct ltt_session *session; | |
3918 | struct ltt_session_list *list = session_get_list(); | |
0e270a1e | 3919 | struct lttng_session_extended *extended = |
b178f53e | 3920 | (typeof(extended)) (&sessions[session_count]); |
2f77fc4b DG |
3921 | |
3922 | DBG("Getting all available session for UID %d GID %d", | |
3923 | uid, gid); | |
3924 | /* | |
3925 | * Iterate over session list and append data after the control struct in | |
3926 | * the buffer. | |
3927 | */ | |
3928 | cds_list_for_each_entry(session, &list->head, list) { | |
e32d7f27 JG |
3929 | if (!session_get(session)) { |
3930 | continue; | |
3931 | } | |
2f77fc4b DG |
3932 | /* |
3933 | * Only list the sessions the user can control. | |
3934 | */ | |
d7b377ed | 3935 | if (!session_access_ok(session, uid) || |
e32d7f27 JG |
3936 | session->destroyed) { |
3937 | session_put(session); | |
2f77fc4b DG |
3938 | continue; |
3939 | } | |
3940 | ||
3941 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3942 | struct ltt_ust_session *usess = session->ust_session; | |
3943 | ||
3944 | if (session->consumer->type == CONSUMER_DST_NET || | |
3945 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
3946 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
3947 | ret = build_network_session_path(sessions[i].path, | |
dec56f6c | 3948 | sizeof(sessions[i].path), session); |
2f77fc4b | 3949 | } else { |
dec56f6c | 3950 | ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s", |
366a9222 | 3951 | session->consumer->dst.session_root_path); |
2f77fc4b DG |
3952 | } |
3953 | if (ret < 0) { | |
3954 | PERROR("snprintf session path"); | |
e32d7f27 | 3955 | session_put(session); |
2f77fc4b DG |
3956 | continue; |
3957 | } | |
3958 | ||
3959 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
3960 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
8382cf6f | 3961 | sessions[i].enabled = session->active; |
2cbf8fed | 3962 | sessions[i].snapshot_mode = session->snapshot_mode; |
8960e9cd | 3963 | sessions[i].live_timer_interval = session->live_timer; |
b178f53e JG |
3964 | extended[i].creation_time.value = (uint64_t) session->creation_time; |
3965 | extended[i].creation_time.is_set = 1; | |
2f77fc4b | 3966 | i++; |
e32d7f27 | 3967 | session_put(session); |
2f77fc4b DG |
3968 | } |
3969 | } | |
3970 | ||
806e2684 | 3971 | /* |
6d805429 | 3972 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
d3f14b8a | 3973 | * ready for trace analysis (or any kind of reader) or else 1 for pending data. |
806e2684 | 3974 | */ |
6d805429 | 3975 | int cmd_data_pending(struct ltt_session *session) |
806e2684 DG |
3976 | { |
3977 | int ret; | |
3978 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3979 | struct ltt_ust_session *usess = session->ust_session; | |
3980 | ||
3981 | assert(session); | |
3982 | ||
5c408ad8 JD |
3983 | DBG("Data pending for session %s", session->name); |
3984 | ||
806e2684 | 3985 | /* Session MUST be stopped to ask for data availability. */ |
8382cf6f | 3986 | if (session->active) { |
806e2684 DG |
3987 | ret = LTTNG_ERR_SESSION_STARTED; |
3988 | goto error; | |
3a89d11a DG |
3989 | } else { |
3990 | /* | |
3991 | * If stopped, just make sure we've started before else the above call | |
3992 | * will always send that there is data pending. | |
3993 | * | |
3994 | * The consumer assumes that when the data pending command is received, | |
3995 | * the trace has been started before or else no output data is written | |
3996 | * by the streams which is a condition for data pending. So, this is | |
3997 | * *VERY* important that we don't ask the consumer before a start | |
3998 | * trace. | |
3999 | */ | |
8382cf6f | 4000 | if (!session->has_been_started) { |
3a89d11a DG |
4001 | ret = 0; |
4002 | goto error; | |
4003 | } | |
806e2684 DG |
4004 | } |
4005 | ||
92816cc3 JG |
4006 | /* A rotation is still pending, we have to wait. */ |
4007 | if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) { | |
5c408ad8 JD |
4008 | DBG("Rotate still pending for session %s", session->name); |
4009 | ret = 1; | |
4010 | goto error; | |
4011 | } | |
4012 | ||
806e2684 | 4013 | if (ksess && ksess->consumer) { |
6d805429 DG |
4014 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
4015 | if (ret == 1) { | |
806e2684 DG |
4016 | /* Data is still being extracted for the kernel. */ |
4017 | goto error; | |
4018 | } | |
4019 | } | |
4020 | ||
4021 | if (usess && usess->consumer) { | |
6d805429 DG |
4022 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
4023 | if (ret == 1) { | |
806e2684 DG |
4024 | /* Data is still being extracted for the kernel. */ |
4025 | goto error; | |
4026 | } | |
4027 | } | |
4028 | ||
4029 | /* Data is ready to be read by a viewer */ | |
6d805429 | 4030 | ret = 0; |
806e2684 DG |
4031 | |
4032 | error: | |
4033 | return ret; | |
4034 | } | |
4035 | ||
6dc3064a DG |
4036 | /* |
4037 | * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library. | |
4038 | * | |
4039 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
4040 | */ | |
4041 | int cmd_snapshot_add_output(struct ltt_session *session, | |
df4f5a87 | 4042 | const struct lttng_snapshot_output *output, uint32_t *id) |
6dc3064a DG |
4043 | { |
4044 | int ret; | |
4045 | struct snapshot_output *new_output; | |
4046 | ||
4047 | assert(session); | |
4048 | assert(output); | |
4049 | ||
4050 | DBG("Cmd snapshot add output for session %s", session->name); | |
4051 | ||
4052 | /* | |
903ef685 | 4053 | * Can't create an output if the session is not set in no-output mode. |
6dc3064a DG |
4054 | */ |
4055 | if (session->output_traces) { | |
903ef685 | 4056 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
4057 | goto error; |
4058 | } | |
4059 | ||
54213acc JG |
4060 | if (session->has_non_mmap_channel) { |
4061 | ret = LTTNG_ERR_SNAPSHOT_UNSUPPORTED; | |
4062 | goto error; | |
4063 | } | |
4064 | ||
6dc3064a DG |
4065 | /* Only one output is allowed until we have the "tee" feature. */ |
4066 | if (session->snapshot.nb_output == 1) { | |
4067 | ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST; | |
4068 | goto error; | |
4069 | } | |
4070 | ||
4071 | new_output = snapshot_output_alloc(); | |
4072 | if (!new_output) { | |
4073 | ret = LTTNG_ERR_NOMEM; | |
4074 | goto error; | |
4075 | } | |
4076 | ||
b178f53e | 4077 | ret = snapshot_output_init(session, output->max_size, output->name, |
6dc3064a DG |
4078 | output->ctrl_url, output->data_url, session->consumer, new_output, |
4079 | &session->snapshot); | |
4080 | if (ret < 0) { | |
4081 | if (ret == -ENOMEM) { | |
4082 | ret = LTTNG_ERR_NOMEM; | |
4083 | } else { | |
4084 | ret = LTTNG_ERR_INVALID; | |
4085 | } | |
4086 | goto free_error; | |
4087 | } | |
4088 | ||
6dc3064a DG |
4089 | rcu_read_lock(); |
4090 | snapshot_add_output(&session->snapshot, new_output); | |
4091 | if (id) { | |
4092 | *id = new_output->id; | |
4093 | } | |
4094 | rcu_read_unlock(); | |
4095 | ||
4096 | return LTTNG_OK; | |
4097 | ||
4098 | free_error: | |
4099 | snapshot_output_destroy(new_output); | |
4100 | error: | |
4101 | return ret; | |
4102 | } | |
4103 | ||
4104 | /* | |
4105 | * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl. | |
4106 | * | |
4107 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
4108 | */ | |
4109 | int cmd_snapshot_del_output(struct ltt_session *session, | |
df4f5a87 | 4110 | const struct lttng_snapshot_output *output) |
6dc3064a DG |
4111 | { |
4112 | int ret; | |
eb240553 | 4113 | struct snapshot_output *sout = NULL; |
6dc3064a DG |
4114 | |
4115 | assert(session); | |
4116 | assert(output); | |
4117 | ||
6dc3064a DG |
4118 | rcu_read_lock(); |
4119 | ||
4120 | /* | |
d3f14b8a MD |
4121 | * Permission denied to create an output if the session is not |
4122 | * set in no output mode. | |
6dc3064a DG |
4123 | */ |
4124 | if (session->output_traces) { | |
903ef685 | 4125 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
4126 | goto error; |
4127 | } | |
4128 | ||
eb240553 DG |
4129 | if (output->id) { |
4130 | DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id, | |
4131 | session->name); | |
4132 | sout = snapshot_find_output_by_id(output->id, &session->snapshot); | |
4133 | } else if (*output->name != '\0') { | |
4134 | DBG("Cmd snapshot del output name %s for session %s", output->name, | |
4135 | session->name); | |
4136 | sout = snapshot_find_output_by_name(output->name, &session->snapshot); | |
4137 | } | |
6dc3064a DG |
4138 | if (!sout) { |
4139 | ret = LTTNG_ERR_INVALID; | |
4140 | goto error; | |
4141 | } | |
4142 | ||
4143 | snapshot_delete_output(&session->snapshot, sout); | |
4144 | snapshot_output_destroy(sout); | |
4145 | ret = LTTNG_OK; | |
4146 | ||
4147 | error: | |
4148 | rcu_read_unlock(); | |
4149 | return ret; | |
4150 | } | |
4151 | ||
4152 | /* | |
4153 | * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl. | |
4154 | * | |
4155 | * If no output is available, outputs is untouched and 0 is returned. | |
4156 | * | |
4157 | * Return the size of the newly allocated outputs or a negative LTTNG_ERR code. | |
4158 | */ | |
4159 | ssize_t cmd_snapshot_list_outputs(struct ltt_session *session, | |
4160 | struct lttng_snapshot_output **outputs) | |
4161 | { | |
4162 | int ret, idx = 0; | |
b223ca94 | 4163 | struct lttng_snapshot_output *list = NULL; |
6dc3064a DG |
4164 | struct lttng_ht_iter iter; |
4165 | struct snapshot_output *output; | |
4166 | ||
4167 | assert(session); | |
4168 | assert(outputs); | |
4169 | ||
4170 | DBG("Cmd snapshot list outputs for session %s", session->name); | |
4171 | ||
4172 | /* | |
d3f14b8a MD |
4173 | * Permission denied to create an output if the session is not |
4174 | * set in no output mode. | |
6dc3064a DG |
4175 | */ |
4176 | if (session->output_traces) { | |
903ef685 JG |
4177 | ret = -LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
4178 | goto end; | |
6dc3064a DG |
4179 | } |
4180 | ||
4181 | if (session->snapshot.nb_output == 0) { | |
4182 | ret = 0; | |
903ef685 | 4183 | goto end; |
6dc3064a DG |
4184 | } |
4185 | ||
4186 | list = zmalloc(session->snapshot.nb_output * sizeof(*list)); | |
4187 | if (!list) { | |
b223ca94 | 4188 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 4189 | goto end; |
6dc3064a DG |
4190 | } |
4191 | ||
4192 | /* Copy list from session to the new list object. */ | |
b223ca94 | 4193 | rcu_read_lock(); |
6dc3064a DG |
4194 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter, |
4195 | output, node.node) { | |
4196 | assert(output->consumer); | |
4197 | list[idx].id = output->id; | |
4198 | list[idx].max_size = output->max_size; | |
6ce22875 MD |
4199 | if (lttng_strncpy(list[idx].name, output->name, |
4200 | sizeof(list[idx].name))) { | |
4201 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 4202 | goto error; |
6ce22875 | 4203 | } |
6dc3064a | 4204 | if (output->consumer->type == CONSUMER_DST_LOCAL) { |
6ce22875 | 4205 | if (lttng_strncpy(list[idx].ctrl_url, |
366a9222 | 4206 | output->consumer->dst.session_root_path, |
6ce22875 MD |
4207 | sizeof(list[idx].ctrl_url))) { |
4208 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 4209 | goto error; |
6ce22875 | 4210 | } |
6dc3064a DG |
4211 | } else { |
4212 | /* Control URI. */ | |
4213 | ret = uri_to_str_url(&output->consumer->dst.net.control, | |
4214 | list[idx].ctrl_url, sizeof(list[idx].ctrl_url)); | |
4215 | if (ret < 0) { | |
b223ca94 | 4216 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 4217 | goto error; |
6dc3064a DG |
4218 | } |
4219 | ||
4220 | /* Data URI. */ | |
4221 | ret = uri_to_str_url(&output->consumer->dst.net.data, | |
4222 | list[idx].data_url, sizeof(list[idx].data_url)); | |
4223 | if (ret < 0) { | |
b223ca94 | 4224 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 4225 | goto error; |
6dc3064a DG |
4226 | } |
4227 | } | |
4228 | idx++; | |
4229 | } | |
4230 | ||
4231 | *outputs = list; | |
b223ca94 JG |
4232 | list = NULL; |
4233 | ret = session->snapshot.nb_output; | |
6dc3064a | 4234 | error: |
903ef685 | 4235 | rcu_read_unlock(); |
b223ca94 | 4236 | free(list); |
903ef685 | 4237 | end: |
b223ca94 | 4238 | return ret; |
6dc3064a DG |
4239 | } |
4240 | ||
93ec662e JD |
4241 | /* |
4242 | * Check if we can regenerate the metadata for this session. | |
4243 | * Only kernel, UST per-uid and non-live sessions are supported. | |
4244 | * | |
4245 | * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise. | |
4246 | */ | |
4247 | static | |
eded6438 | 4248 | int check_regenerate_metadata_support(struct ltt_session *session) |
93ec662e JD |
4249 | { |
4250 | int ret; | |
4251 | ||
4252 | assert(session); | |
4253 | ||
4254 | if (session->live_timer != 0) { | |
4255 | ret = LTTNG_ERR_LIVE_SESSION; | |
4256 | goto end; | |
4257 | } | |
4258 | if (!session->active) { | |
4259 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
4260 | goto end; | |
4261 | } | |
4262 | if (session->ust_session) { | |
4263 | switch (session->ust_session->buffer_type) { | |
4264 | case LTTNG_BUFFER_PER_UID: | |
4265 | break; | |
4266 | case LTTNG_BUFFER_PER_PID: | |
4267 | ret = LTTNG_ERR_PER_PID_SESSION; | |
4268 | goto end; | |
4269 | default: | |
4270 | assert(0); | |
4271 | ret = LTTNG_ERR_UNK; | |
4272 | goto end; | |
4273 | } | |
4274 | } | |
4275 | if (session->consumer->type == CONSUMER_DST_NET && | |
4276 | session->consumer->relay_minor_version < 8) { | |
4277 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; | |
4278 | goto end; | |
4279 | } | |
4280 | ret = 0; | |
4281 | ||
4282 | end: | |
4283 | return ret; | |
4284 | } | |
4285 | ||
7802bae3 LL |
4286 | static |
4287 | int clear_metadata_file(int fd) | |
4288 | { | |
4289 | int ret; | |
a5df8828 | 4290 | off_t lseek_ret; |
7802bae3 | 4291 | |
a5df8828 GL |
4292 | lseek_ret = lseek(fd, 0, SEEK_SET); |
4293 | if (lseek_ret < 0) { | |
7802bae3 | 4294 | PERROR("lseek"); |
a5df8828 | 4295 | ret = -1; |
7802bae3 LL |
4296 | goto end; |
4297 | } | |
4298 | ||
4299 | ret = ftruncate(fd, 0); | |
4300 | if (ret < 0) { | |
4301 | PERROR("ftruncate"); | |
4302 | goto end; | |
4303 | } | |
4304 | ||
4305 | end: | |
4306 | return ret; | |
4307 | } | |
4308 | ||
93ec662e | 4309 | static |
eded6438 | 4310 | int ust_regenerate_metadata(struct ltt_ust_session *usess) |
93ec662e JD |
4311 | { |
4312 | int ret = 0; | |
4313 | struct buffer_reg_uid *uid_reg = NULL; | |
4314 | struct buffer_reg_session *session_reg = NULL; | |
4315 | ||
4316 | rcu_read_lock(); | |
4317 | cds_list_for_each_entry(uid_reg, &usess->buffer_reg_uid_list, lnode) { | |
4318 | struct ust_registry_session *registry; | |
4319 | struct ust_registry_channel *chan; | |
4320 | struct lttng_ht_iter iter_chan; | |
4321 | ||
4322 | session_reg = uid_reg->registry; | |
4323 | registry = session_reg->reg.ust; | |
4324 | ||
4325 | pthread_mutex_lock(®istry->lock); | |
4326 | registry->metadata_len_sent = 0; | |
4327 | memset(registry->metadata, 0, registry->metadata_alloc_len); | |
4328 | registry->metadata_len = 0; | |
4329 | registry->metadata_version++; | |
7802bae3 LL |
4330 | if (registry->metadata_fd > 0) { |
4331 | /* Clear the metadata file's content. */ | |
4332 | ret = clear_metadata_file(registry->metadata_fd); | |
4333 | if (ret) { | |
4334 | pthread_mutex_unlock(®istry->lock); | |
4335 | goto end; | |
4336 | } | |
4337 | } | |
4338 | ||
93ec662e JD |
4339 | ret = ust_metadata_session_statedump(registry, NULL, |
4340 | registry->major, registry->minor); | |
4341 | if (ret) { | |
4342 | pthread_mutex_unlock(®istry->lock); | |
4343 | ERR("Failed to generate session metadata (err = %d)", | |
4344 | ret); | |
4345 | goto end; | |
4346 | } | |
4347 | cds_lfht_for_each_entry(registry->channels->ht, &iter_chan.iter, | |
4348 | chan, node.node) { | |
4349 | struct ust_registry_event *event; | |
4350 | struct lttng_ht_iter iter_event; | |
4351 | ||
4352 | ret = ust_metadata_channel_statedump(registry, chan); | |
4353 | if (ret) { | |
4354 | pthread_mutex_unlock(®istry->lock); | |
4355 | ERR("Failed to generate channel metadata " | |
4356 | "(err = %d)", ret); | |
4357 | goto end; | |
4358 | } | |
4359 | cds_lfht_for_each_entry(chan->ht->ht, &iter_event.iter, | |
4360 | event, node.node) { | |
4361 | ret = ust_metadata_event_statedump(registry, | |
4362 | chan, event); | |
4363 | if (ret) { | |
4364 | pthread_mutex_unlock(®istry->lock); | |
4365 | ERR("Failed to generate event metadata " | |
4366 | "(err = %d)", ret); | |
4367 | goto end; | |
4368 | } | |
4369 | } | |
4370 | } | |
4371 | pthread_mutex_unlock(®istry->lock); | |
4372 | } | |
4373 | ||
4374 | end: | |
4375 | rcu_read_unlock(); | |
4376 | return ret; | |
4377 | } | |
4378 | ||
4379 | /* | |
eded6438 | 4380 | * Command LTTNG_REGENERATE_METADATA from the lttng-ctl library. |
93ec662e JD |
4381 | * |
4382 | * Ask the consumer to truncate the existing metadata file(s) and | |
4383 | * then regenerate the metadata. Live and per-pid sessions are not | |
4384 | * supported and return an error. | |
4385 | * | |
1136f41b | 4386 | * Return LTTNG_OK on success or else a LTTNG_ERR code. |
93ec662e | 4387 | */ |
eded6438 | 4388 | int cmd_regenerate_metadata(struct ltt_session *session) |
93ec662e JD |
4389 | { |
4390 | int ret; | |
4391 | ||
4392 | assert(session); | |
4393 | ||
eded6438 | 4394 | ret = check_regenerate_metadata_support(session); |
93ec662e JD |
4395 | if (ret) { |
4396 | goto end; | |
4397 | } | |
4398 | ||
4399 | if (session->kernel_session) { | |
eded6438 | 4400 | ret = kernctl_session_regenerate_metadata( |
93ec662e JD |
4401 | session->kernel_session->fd); |
4402 | if (ret < 0) { | |
4403 | ERR("Failed to regenerate the kernel metadata"); | |
4404 | goto end; | |
4405 | } | |
4406 | } | |
4407 | ||
4408 | if (session->ust_session) { | |
eded6438 | 4409 | ret = ust_regenerate_metadata(session->ust_session); |
93ec662e JD |
4410 | if (ret < 0) { |
4411 | ERR("Failed to regenerate the UST metadata"); | |
4412 | goto end; | |
4413 | } | |
4414 | } | |
4415 | DBG("Cmd metadata regenerate for session %s", session->name); | |
4416 | ret = LTTNG_OK; | |
4417 | ||
4418 | end: | |
4419 | return ret; | |
4420 | } | |
4421 | ||
c2561365 JD |
4422 | /* |
4423 | * Command LTTNG_REGENERATE_STATEDUMP from the lttng-ctl library. | |
4424 | * | |
4425 | * Ask the tracer to regenerate a new statedump. | |
4426 | * | |
1136f41b | 4427 | * Return LTTNG_OK on success or else a LTTNG_ERR code. |
c2561365 JD |
4428 | */ |
4429 | int cmd_regenerate_statedump(struct ltt_session *session) | |
4430 | { | |
4431 | int ret; | |
4432 | ||
4433 | assert(session); | |
4434 | ||
4435 | if (!session->active) { | |
4436 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
4437 | goto end; | |
4438 | } | |
c2561365 JD |
4439 | |
4440 | if (session->kernel_session) { | |
4441 | ret = kernctl_session_regenerate_statedump( | |
4442 | session->kernel_session->fd); | |
4443 | /* | |
4444 | * Currently, the statedump in kernel can only fail if out | |
4445 | * of memory. | |
4446 | */ | |
4447 | if (ret < 0) { | |
4448 | if (ret == -ENOMEM) { | |
4449 | ret = LTTNG_ERR_REGEN_STATEDUMP_NOMEM; | |
4450 | } else { | |
4451 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
4452 | } | |
4453 | ERR("Failed to regenerate the kernel statedump"); | |
4454 | goto end; | |
4455 | } | |
4456 | } | |
4457 | ||
4458 | if (session->ust_session) { | |
4459 | ret = ust_app_regenerate_statedump_all(session->ust_session); | |
4460 | /* | |
4461 | * Currently, the statedump in UST always returns 0. | |
4462 | */ | |
4463 | if (ret < 0) { | |
4464 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
4465 | ERR("Failed to regenerate the UST statedump"); | |
4466 | goto end; | |
4467 | } | |
4468 | } | |
4469 | DBG("Cmd regenerate statedump for session %s", session->name); | |
4470 | ret = LTTNG_OK; | |
4471 | ||
4472 | end: | |
4473 | return ret; | |
4474 | } | |
4475 | ||
989a0844 FD |
4476 | static |
4477 | enum lttng_error_code synchronize_tracer_notifier_register( | |
4478 | struct notification_thread_handle *notification_thread, | |
4479 | struct lttng_trigger *trigger, const struct lttng_credentials *cmd_creds) | |
70670472 | 4480 | { |
989a0844 | 4481 | enum lttng_error_code ret_code; |
7c1f6da2 JG |
4482 | const struct lttng_condition *condition = |
4483 | lttng_trigger_get_const_condition(trigger); | |
989a0844 FD |
4484 | const char *trigger_name; |
4485 | uid_t trigger_owner; | |
4486 | enum lttng_trigger_status trigger_status; | |
4487 | const enum lttng_domain_type trigger_domain = | |
4488 | lttng_trigger_get_underlying_domain_type_restriction( | |
4489 | trigger); | |
70670472 | 4490 | |
989a0844 FD |
4491 | trigger_status = lttng_trigger_get_owner_uid(trigger, &trigger_owner); |
4492 | assert(trigger_status == LTTNG_TRIGGER_STATUS_OK); | |
4493 | ||
4494 | assert(condition); | |
8dbb86b8 JR |
4495 | assert(lttng_condition_get_type(condition) == |
4496 | LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES); | |
989a0844 FD |
4497 | |
4498 | trigger_status = lttng_trigger_get_name(trigger, &trigger_name); | |
4499 | trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ? | |
0efb2ad7 | 4500 | trigger_name : "(anonymous)"; |
989a0844 FD |
4501 | |
4502 | session_lock_list(); | |
4503 | switch (trigger_domain) { | |
4504 | case LTTNG_DOMAIN_KERNEL: | |
4505 | { | |
4506 | ret_code = kernel_register_event_notifier(trigger, cmd_creds); | |
4507 | if (ret_code != LTTNG_OK) { | |
4508 | enum lttng_error_code notif_thread_unregister_ret; | |
4509 | ||
4510 | notif_thread_unregister_ret = | |
4511 | notification_thread_command_unregister_trigger( | |
4512 | notification_thread, trigger); | |
4513 | ||
4514 | if (notif_thread_unregister_ret != LTTNG_OK) { | |
4515 | /* Return the original error code. */ | |
4516 | ERR("Failed to unregister trigger from notification thread during error recovery: trigger name = '%s', trigger owner uid = %d, error code = %d", | |
4517 | trigger_name, | |
4518 | (int) trigger_owner, | |
4519 | ret_code); | |
4520 | } | |
4521 | } | |
4522 | break; | |
70670472 | 4523 | } |
989a0844 FD |
4524 | case LTTNG_DOMAIN_UST: |
4525 | ust_app_global_update_all_event_notifier_rules(); | |
4526 | break; | |
4527 | case LTTNG_DOMAIN_JUL: | |
4528 | case LTTNG_DOMAIN_LOG4J: | |
4529 | case LTTNG_DOMAIN_PYTHON: | |
4530 | { | |
4531 | /* Agent domains. */ | |
4532 | struct agent *agt = agent_find_by_event_notifier_domain( | |
4533 | trigger_domain); | |
70670472 | 4534 | |
989a0844 FD |
4535 | if (!agt) { |
4536 | agt = agent_create(trigger_domain); | |
4537 | if (!agt) { | |
4538 | ret_code = LTTNG_ERR_NOMEM; | |
4539 | goto end_unlock_session_list; | |
4540 | } | |
4541 | ||
412d7227 | 4542 | agent_add(agt, the_trigger_agents_ht_by_domain); |
989a0844 FD |
4543 | } |
4544 | ||
4545 | ret_code = trigger_agent_enable(trigger, agt); | |
4546 | if (ret_code != LTTNG_OK) { | |
4547 | goto end_unlock_session_list; | |
4548 | } | |
4549 | ||
4550 | break; | |
4551 | } | |
4552 | case LTTNG_DOMAIN_NONE: | |
4553 | default: | |
4554 | abort(); | |
4555 | } | |
4556 | ||
4557 | ret_code = LTTNG_OK; | |
4558 | end_unlock_session_list: | |
4559 | session_unlock_list(); | |
70670472 JR |
4560 | return ret_code; |
4561 | } | |
4562 | ||
4563 | enum lttng_error_code cmd_register_trigger(const struct lttng_credentials *cmd_creds, | |
746e08d7 | 4564 | struct lttng_trigger *trigger, |
0efb2ad7 | 4565 | bool is_trigger_anonymous, |
242388e4 JR |
4566 | struct notification_thread_handle *notification_thread, |
4567 | struct lttng_trigger **return_trigger) | |
b0880ae5 | 4568 | { |
70670472 | 4569 | enum lttng_error_code ret_code; |
70670472 JR |
4570 | const char *trigger_name; |
4571 | uid_t trigger_owner; | |
4572 | enum lttng_trigger_status trigger_status; | |
4573 | ||
4574 | trigger_status = lttng_trigger_get_name(trigger, &trigger_name); | |
ce0b1d61 | 4575 | trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ? |
0efb2ad7 | 4576 | trigger_name : "(anonymous)"; |
ce0b1d61 | 4577 | |
70670472 JR |
4578 | trigger_status = lttng_trigger_get_owner_uid( |
4579 | trigger, &trigger_owner); | |
4580 | assert(trigger_status == LTTNG_TRIGGER_STATUS_OK); | |
4581 | ||
4582 | DBG("Running register trigger command: trigger name = '%s', trigger owner uid = %d, command creds uid = %d", | |
4583 | trigger_name, (int) trigger_owner, | |
4584 | (int) lttng_credentials_get_uid(cmd_creds)); | |
b0880ae5 | 4585 | |
64eafdf6 JR |
4586 | /* |
4587 | * Validate the trigger credentials against the command credentials. | |
4588 | * Only the root user can register a trigger with non-matching | |
4589 | * credentials. | |
4590 | */ | |
4591 | if (!lttng_credentials_is_equal_uid( | |
4592 | lttng_trigger_get_credentials(trigger), | |
746e08d7 JG |
4593 | cmd_creds)) { |
4594 | if (lttng_credentials_get_uid(cmd_creds) != 0) { | |
70670472 JR |
4595 | ERR("Trigger credentials do not match the command credentials: trigger name = '%s', trigger owner uid = %d, command creds uid = %d", |
4596 | trigger_name, (int) trigger_owner, | |
4597 | (int) lttng_credentials_get_uid(cmd_creds)); | |
4598 | ret_code = LTTNG_ERR_INVALID_TRIGGER; | |
64eafdf6 JR |
4599 | goto end; |
4600 | } | |
4601 | } | |
3da864a9 | 4602 | |
58daac01 JR |
4603 | /* |
4604 | * The bytecode generation also serves as a validation step for the | |
4605 | * bytecode expressions. | |
4606 | */ | |
70670472 JR |
4607 | ret_code = lttng_trigger_generate_bytecode(trigger, cmd_creds); |
4608 | if (ret_code != LTTNG_OK) { | |
4609 | ERR("Failed to generate bytecode of trigger: trigger name = '%s', trigger owner uid = %d, error code = %d", | |
4610 | trigger_name, (int) trigger_owner, ret_code); | |
58daac01 JR |
4611 | goto end; |
4612 | } | |
4613 | ||
242388e4 JR |
4614 | /* |
4615 | * A reference to the trigger is acquired by the notification thread. | |
4616 | * It is safe to return the same trigger to the caller since it the | |
4617 | * other user holds a reference. | |
4618 | * | |
4619 | * The trigger is modified during the execution of the | |
4620 | * "register trigger" command. However, by the time the command returns, | |
4621 | * it is safe to use without any locking as its properties are | |
4622 | * immutable. | |
4623 | */ | |
0efb2ad7 JG |
4624 | ret_code = notification_thread_command_register_trigger( |
4625 | notification_thread, trigger, is_trigger_anonymous); | |
70670472 | 4626 | if (ret_code != LTTNG_OK) { |
ce0b1d61 | 4627 | DBG("Failed to register trigger to notification thread: trigger name = '%s', trigger owner uid = %d, error code = %d", |
70670472 | 4628 | trigger_name, (int) trigger_owner, ret_code); |
44760c20 | 4629 | goto end; |
70670472 JR |
4630 | } |
4631 | ||
ce0b1d61 JG |
4632 | trigger_status = lttng_trigger_get_name(trigger, &trigger_name); |
4633 | trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ? | |
0efb2ad7 | 4634 | trigger_name : "(anonymous)"; |
ce0b1d61 | 4635 | |
70670472 JR |
4636 | /* |
4637 | * Synchronize tracers if the trigger adds an event notifier. | |
4638 | */ | |
989a0844 FD |
4639 | if (lttng_trigger_needs_tracer_notifier(trigger)) { |
4640 | ret_code = synchronize_tracer_notifier_register(notification_thread, | |
4641 | trigger, cmd_creds); | |
4642 | if (ret_code != LTTNG_OK) { | |
4643 | ERR("Error registering tracer notifier: %s", | |
4644 | lttng_strerror(-ret_code)); | |
4645 | goto end; | |
70670472 JR |
4646 | } |
4647 | } | |
4648 | ||
746e08d7 JG |
4649 | /* |
4650 | * Return an updated trigger to the client. | |
4651 | * | |
4652 | * Since a modified version of the same trigger is returned, acquire a | |
4653 | * reference to the trigger so the caller doesn't have to care if those | |
4654 | * are distinct instances or not. | |
4655 | */ | |
39b95a70 JG |
4656 | if (ret_code == LTTNG_OK) { |
4657 | lttng_trigger_get(trigger); | |
4658 | *return_trigger = trigger; | |
4659 | /* Ownership of trigger was transferred to caller. */ | |
4660 | trigger = NULL; | |
4661 | } | |
b0880ae5 | 4662 | end: |
70670472 | 4663 | return ret_code; |
989a0844 FD |
4664 | } |
4665 | ||
4666 | static | |
4667 | enum lttng_error_code synchronize_tracer_notifier_unregister( | |
4668 | const struct lttng_trigger *trigger) | |
4669 | { | |
4670 | enum lttng_error_code ret_code; | |
4671 | const struct lttng_condition *condition = | |
4672 | lttng_trigger_get_const_condition(trigger); | |
4673 | const enum lttng_domain_type trigger_domain = | |
4674 | lttng_trigger_get_underlying_domain_type_restriction( | |
4675 | trigger); | |
4676 | ||
4677 | assert(condition); | |
8dbb86b8 JR |
4678 | assert(lttng_condition_get_type(condition) == |
4679 | LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES); | |
989a0844 FD |
4680 | |
4681 | session_lock_list(); | |
4682 | switch (trigger_domain) { | |
4683 | case LTTNG_DOMAIN_KERNEL: | |
4684 | ret_code = kernel_unregister_event_notifier(trigger); | |
e689039f JG |
4685 | if (ret_code != LTTNG_OK) { |
4686 | goto end_unlock_session_list; | |
4687 | } | |
4688 | ||
989a0844 FD |
4689 | break; |
4690 | case LTTNG_DOMAIN_UST: | |
4691 | ust_app_global_update_all_event_notifier_rules(); | |
4692 | break; | |
4693 | case LTTNG_DOMAIN_JUL: | |
4694 | case LTTNG_DOMAIN_LOG4J: | |
4695 | case LTTNG_DOMAIN_PYTHON: | |
4696 | { | |
4697 | /* Agent domains. */ | |
4698 | struct agent *agt = agent_find_by_event_notifier_domain( | |
4699 | trigger_domain); | |
4700 | ||
566190c4 JG |
4701 | /* |
4702 | * This trigger was never registered in the first place. Calling | |
4703 | * this function under those circumstances is an internal error. | |
4704 | */ | |
4705 | assert(agt); | |
989a0844 FD |
4706 | ret_code = trigger_agent_disable(trigger, agt); |
4707 | if (ret_code != LTTNG_OK) { | |
4708 | goto end_unlock_session_list; | |
4709 | } | |
4710 | ||
4711 | break; | |
4712 | } | |
4713 | case LTTNG_DOMAIN_NONE: | |
4714 | default: | |
4715 | abort(); | |
4716 | } | |
4717 | ||
4718 | ret_code = LTTNG_OK; | |
4719 | ||
9b7cbebd JG |
4720 | end_unlock_session_list: |
4721 | session_unlock_list(); | |
4722 | return ret_code; | |
b0880ae5 JG |
4723 | } |
4724 | ||
70670472 | 4725 | enum lttng_error_code cmd_unregister_trigger(const struct lttng_credentials *cmd_creds, |
746e08d7 | 4726 | const struct lttng_trigger *trigger, |
b0880ae5 JG |
4727 | struct notification_thread_handle *notification_thread) |
4728 | { | |
70670472 | 4729 | enum lttng_error_code ret_code; |
70670472 JR |
4730 | const char *trigger_name; |
4731 | uid_t trigger_owner; | |
4732 | enum lttng_trigger_status trigger_status; | |
5c5373c3 | 4733 | struct lttng_trigger *sessiond_trigger = NULL; |
70670472 JR |
4734 | |
4735 | trigger_status = lttng_trigger_get_name(trigger, &trigger_name); | |
0efb2ad7 | 4736 | trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ? trigger_name : "(anonymous)"; |
989a0844 | 4737 | trigger_status = lttng_trigger_get_owner_uid(trigger, &trigger_owner); |
70670472 JR |
4738 | assert(trigger_status == LTTNG_TRIGGER_STATUS_OK); |
4739 | ||
4740 | DBG("Running unregister trigger command: trigger name = '%s', trigger owner uid = %d, command creds uid = %d", | |
4741 | trigger_name, (int) trigger_owner, | |
4742 | (int) lttng_credentials_get_uid(cmd_creds)); | |
b0880ae5 | 4743 | |
64eafdf6 JR |
4744 | /* |
4745 | * Validate the trigger credentials against the command credentials. | |
4746 | * Only the root user can unregister a trigger with non-matching | |
4747 | * credentials. | |
4748 | */ | |
4749 | if (!lttng_credentials_is_equal_uid( | |
4750 | lttng_trigger_get_credentials(trigger), | |
746e08d7 JG |
4751 | cmd_creds)) { |
4752 | if (lttng_credentials_get_uid(cmd_creds) != 0) { | |
70670472 JR |
4753 | ERR("Trigger credentials do not match the command credentials: trigger name = '%s', trigger owner uid = %d, command creds uid = %d", |
4754 | trigger_name, (int) trigger_owner, | |
4755 | (int) lttng_credentials_get_uid(cmd_creds)); | |
4756 | ret_code = LTTNG_ERR_INVALID_TRIGGER; | |
64eafdf6 JR |
4757 | goto end; |
4758 | } | |
4759 | } | |
3da864a9 | 4760 | |
5c5373c3 JR |
4761 | /* Fetch the sessiond side trigger object. */ |
4762 | ret_code = notification_thread_command_get_trigger( | |
4763 | notification_thread, trigger, &sessiond_trigger); | |
4764 | if (ret_code != LTTNG_OK) { | |
4765 | DBG("Failed to get trigger from notification thread during unregister: trigger name = '%s', trigger owner uid = %d, error code = %d", | |
4766 | trigger_name, (int) trigger_owner, ret_code); | |
4767 | goto end; | |
4768 | } | |
4769 | ||
4770 | assert(sessiond_trigger); | |
4771 | ||
4772 | /* | |
4773 | * From this point on, no matter what, consider the trigger | |
4774 | * unregistered. | |
4775 | * | |
4776 | * We set the unregistered state of the sessiond side trigger object in | |
4777 | * the client thread since we want to minimize the possibility of the | |
4778 | * notification thread being stalled due to a long execution of an | |
4779 | * action that required the trigger lock. | |
4780 | */ | |
4781 | lttng_trigger_set_as_unregistered(sessiond_trigger); | |
4782 | ||
70670472 JR |
4783 | ret_code = notification_thread_command_unregister_trigger(notification_thread, |
4784 | trigger); | |
4785 | if (ret_code != LTTNG_OK) { | |
ce0b1d61 | 4786 | DBG("Failed to unregister trigger from notification thread: trigger name = '%s', trigger owner uid = %d, error code = %d", |
70670472 | 4787 | trigger_name, (int) trigger_owner, ret_code); |
13839b27 | 4788 | goto end; |
70670472 JR |
4789 | } |
4790 | ||
4791 | /* | |
4792 | * Synchronize tracers if the trigger removes an event notifier. | |
44760c20 JR |
4793 | * Do this even if the trigger unregistration failed to at least stop |
4794 | * the tracers from producing notifications associated with this | |
4795 | * event notifier. | |
70670472 | 4796 | */ |
989a0844 FD |
4797 | if (lttng_trigger_needs_tracer_notifier(trigger)) { |
4798 | ret_code = synchronize_tracer_notifier_unregister(trigger); | |
4799 | if (ret_code != LTTNG_OK) { | |
4800 | ERR("Error unregistering trigger to tracer."); | |
4801 | goto end; | |
70670472 | 4802 | } |
9b7cbebd | 4803 | |
70670472 JR |
4804 | } |
4805 | ||
b0880ae5 | 4806 | end: |
5c5373c3 | 4807 | lttng_trigger_put(sessiond_trigger); |
70670472 | 4808 | return ret_code; |
989a0844 | 4809 | } |
b0880ae5 | 4810 | |
81007260 | 4811 | enum lttng_error_code cmd_list_triggers(struct command_ctx *cmd_ctx, |
fbc9f37d JR |
4812 | struct notification_thread_handle *notification_thread, |
4813 | struct lttng_triggers **return_triggers) | |
4814 | { | |
5682b2e6 | 4815 | int ret; |
fbc9f37d JR |
4816 | enum lttng_error_code ret_code; |
4817 | struct lttng_triggers *triggers = NULL; | |
4818 | ||
4819 | /* Get the set of triggers from the notification thread. */ | |
4820 | ret_code = notification_thread_command_list_triggers( | |
4821 | notification_thread, cmd_ctx->creds.uid, &triggers); | |
4822 | if (ret_code != LTTNG_OK) { | |
fbc9f37d JR |
4823 | goto end; |
4824 | } | |
4825 | ||
5682b2e6 JG |
4826 | ret = lttng_triggers_remove_hidden_triggers(triggers); |
4827 | if (ret) { | |
4828 | ret_code = LTTNG_ERR_UNK; | |
4829 | goto end; | |
4830 | } | |
4831 | ||
fbc9f37d JR |
4832 | *return_triggers = triggers; |
4833 | triggers = NULL; | |
81007260 | 4834 | ret_code = LTTNG_OK; |
fbc9f37d JR |
4835 | end: |
4836 | lttng_triggers_destroy(triggers); | |
81007260 | 4837 | return ret_code; |
fbc9f37d | 4838 | } |
588c4b0d JG |
4839 | |
4840 | enum lttng_error_code cmd_execute_error_query(const struct lttng_credentials *cmd_creds, | |
4841 | const struct lttng_error_query *query, | |
4842 | struct lttng_error_query_results **_results, | |
4843 | struct notification_thread_handle *notification_thread) | |
4844 | { | |
4845 | enum lttng_error_code ret_code; | |
4846 | const struct lttng_trigger *query_target_trigger; | |
8ce7c93a | 4847 | const struct lttng_action *query_target_action = NULL; |
588c4b0d JG |
4848 | struct lttng_trigger *matching_trigger = NULL; |
4849 | const char *trigger_name; | |
4850 | uid_t trigger_owner; | |
4851 | enum lttng_trigger_status trigger_status; | |
4852 | struct lttng_error_query_results *results = NULL; | |
4853 | ||
4854 | switch (lttng_error_query_get_target_type(query)) { | |
4855 | case LTTNG_ERROR_QUERY_TARGET_TYPE_TRIGGER: | |
4856 | query_target_trigger = lttng_error_query_trigger_borrow_target(query); | |
4857 | break; | |
8ce7c93a JG |
4858 | case LTTNG_ERROR_QUERY_TARGET_TYPE_CONDITION: |
4859 | query_target_trigger = | |
4860 | lttng_error_query_condition_borrow_target(query); | |
4861 | break; | |
588c4b0d JG |
4862 | case LTTNG_ERROR_QUERY_TARGET_TYPE_ACTION: |
4863 | query_target_trigger = lttng_error_query_action_borrow_trigger_target( | |
4864 | query); | |
4865 | break; | |
4866 | default: | |
4867 | abort(); | |
4868 | } | |
4869 | ||
4870 | assert(query_target_trigger); | |
4871 | ||
4872 | ret_code = notification_thread_command_get_trigger(notification_thread, | |
4873 | query_target_trigger, &matching_trigger); | |
4874 | if (ret_code != LTTNG_OK) { | |
4875 | goto end; | |
4876 | } | |
4877 | ||
4878 | /* No longer needed. */ | |
4879 | query_target_trigger = NULL; | |
4880 | ||
4881 | if (lttng_error_query_get_target_type(query) == | |
4882 | LTTNG_ERROR_QUERY_TARGET_TYPE_ACTION) { | |
4883 | /* Get the sessiond-side version of the target action. */ | |
4884 | query_target_action = | |
4885 | lttng_error_query_action_borrow_action_target( | |
4886 | query, matching_trigger); | |
4887 | } | |
4888 | ||
4889 | trigger_status = lttng_trigger_get_name(matching_trigger, &trigger_name); | |
4890 | trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ? | |
0efb2ad7 | 4891 | trigger_name : "(anonymous)"; |
588c4b0d JG |
4892 | trigger_status = lttng_trigger_get_owner_uid(matching_trigger, |
4893 | &trigger_owner); | |
4894 | assert(trigger_status == LTTNG_TRIGGER_STATUS_OK); | |
4895 | ||
4896 | results = lttng_error_query_results_create(); | |
4897 | if (!results) { | |
4898 | ret_code = LTTNG_ERR_NOMEM; | |
4899 | goto end; | |
4900 | } | |
4901 | ||
4902 | DBG("Running \"execute error query\" command: trigger name = '%s', trigger owner uid = %d, command creds uid = %d", | |
4903 | trigger_name, (int) trigger_owner, | |
4904 | (int) lttng_credentials_get_uid(cmd_creds)); | |
4905 | ||
4906 | /* | |
4907 | * Validate the trigger credentials against the command credentials. | |
4908 | * Only the root user can target a trigger with non-matching | |
4909 | * credentials. | |
4910 | */ | |
4911 | if (!lttng_credentials_is_equal_uid( | |
4912 | lttng_trigger_get_credentials(matching_trigger), | |
4913 | cmd_creds)) { | |
4914 | if (lttng_credentials_get_uid(cmd_creds) != 0) { | |
4915 | ERR("Trigger credentials do not match the command credentials: trigger name = '%s', trigger owner uid = %d, command creds uid = %d", | |
4916 | trigger_name, (int) trigger_owner, | |
4917 | (int) lttng_credentials_get_uid(cmd_creds)); | |
4918 | ret_code = LTTNG_ERR_INVALID_TRIGGER; | |
4919 | goto end; | |
4920 | } | |
4921 | } | |
4922 | ||
4923 | switch (lttng_error_query_get_target_type(query)) { | |
4924 | case LTTNG_ERROR_QUERY_TARGET_TYPE_TRIGGER: | |
4925 | trigger_status = lttng_trigger_add_error_results( | |
4926 | matching_trigger, results); | |
4927 | ||
4928 | switch (trigger_status) { | |
4929 | case LTTNG_TRIGGER_STATUS_OK: | |
4930 | break; | |
4931 | default: | |
4932 | ret_code = LTTNG_ERR_UNK; | |
4933 | goto end; | |
4934 | } | |
4935 | ||
4936 | break; | |
8ce7c93a JG |
4937 | case LTTNG_ERROR_QUERY_TARGET_TYPE_CONDITION: |
4938 | { | |
4939 | trigger_status = lttng_trigger_condition_add_error_results( | |
4940 | matching_trigger, results); | |
4941 | ||
4942 | switch (trigger_status) { | |
4943 | case LTTNG_TRIGGER_STATUS_OK: | |
4944 | break; | |
4945 | default: | |
4946 | ret_code = LTTNG_ERR_UNK; | |
4947 | goto end; | |
4948 | } | |
4949 | ||
4950 | break; | |
4951 | } | |
588c4b0d JG |
4952 | case LTTNG_ERROR_QUERY_TARGET_TYPE_ACTION: |
4953 | { | |
4954 | const enum lttng_action_status action_status = | |
4955 | lttng_action_add_error_query_results( | |
4956 | query_target_action, results); | |
4957 | ||
4958 | switch (action_status) { | |
4959 | case LTTNG_ACTION_STATUS_OK: | |
4960 | break; | |
4961 | default: | |
4962 | ret_code = LTTNG_ERR_UNK; | |
4963 | goto end; | |
4964 | } | |
4965 | ||
4966 | break; | |
4967 | } | |
4968 | default: | |
ef4cf1d2 | 4969 | abort(); |
588c4b0d JG |
4970 | break; |
4971 | } | |
4972 | ||
4973 | *_results = results; | |
4974 | results = NULL; | |
4975 | ret_code = LTTNG_OK; | |
4976 | end: | |
4977 | lttng_trigger_put(matching_trigger); | |
4978 | lttng_error_query_results_destroy(results); | |
4979 | return ret_code; | |
4980 | } | |
4981 | ||
6dc3064a DG |
4982 | /* |
4983 | * Send relayd sockets from snapshot output to consumer. Ignore request if the | |
4984 | * snapshot output is *not* set with a remote destination. | |
4985 | * | |
9a654598 | 4986 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a | 4987 | */ |
9a654598 | 4988 | static enum lttng_error_code set_relayd_for_snapshot( |
348a81dc | 4989 | struct consumer_output *output, |
fb9a95c4 | 4990 | const struct ltt_session *session) |
6dc3064a | 4991 | { |
9a654598 | 4992 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
4993 | struct lttng_ht_iter iter; |
4994 | struct consumer_socket *socket; | |
1e791a74 | 4995 | LTTNG_OPTIONAL(uint64_t) current_chunk_id = {}; |
6fa5fe7c | 4996 | const char *base_path; |
6dc3064a | 4997 | |
348a81dc | 4998 | assert(output); |
6dc3064a DG |
4999 | assert(session); |
5000 | ||
5001 | DBG2("Set relayd object from snapshot output"); | |
5002 | ||
1e791a74 | 5003 | if (session->current_trace_chunk) { |
348a81dc JG |
5004 | enum lttng_trace_chunk_status chunk_status = |
5005 | lttng_trace_chunk_get_id( | |
5006 | session->current_trace_chunk, | |
5007 | ¤t_chunk_id.value); | |
1e791a74 | 5008 | |
348a81dc | 5009 | if (chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK) { |
1e791a74 JG |
5010 | current_chunk_id.is_set = true; |
5011 | } else { | |
5012 | ERR("Failed to get current trace chunk id"); | |
5013 | status = LTTNG_ERR_UNK; | |
5014 | goto error; | |
5015 | } | |
5016 | } | |
5017 | ||
6dc3064a | 5018 | /* Ignore if snapshot consumer output is not network. */ |
348a81dc | 5019 | if (output->type != CONSUMER_DST_NET) { |
6dc3064a DG |
5020 | goto error; |
5021 | } | |
5022 | ||
6fa5fe7c MD |
5023 | /* |
5024 | * The snapshot record URI base path overrides the session | |
5025 | * base path. | |
5026 | */ | |
5027 | if (output->dst.net.control.subdir[0] != '\0') { | |
5028 | base_path = output->dst.net.control.subdir; | |
5029 | } else { | |
5030 | base_path = session->base_path; | |
5031 | } | |
5032 | ||
6dc3064a DG |
5033 | /* |
5034 | * For each consumer socket, create and send the relayd object of the | |
5035 | * snapshot output. | |
5036 | */ | |
5037 | rcu_read_lock(); | |
348a81dc | 5038 | cds_lfht_for_each_entry(output->socks->ht, &iter.iter, |
5eecee74 | 5039 | socket, node.node) { |
ecd0f96d | 5040 | pthread_mutex_lock(socket->lock); |
9a654598 | 5041 | status = send_consumer_relayd_sockets(0, session->id, |
348a81dc | 5042 | output, socket, |
d3e2ba59 | 5043 | session->name, session->hostname, |
6fa5fe7c | 5044 | base_path, |
1e791a74 | 5045 | session->live_timer, |
db1da059 | 5046 | current_chunk_id.is_set ? ¤t_chunk_id.value : NULL, |
46ef2188 MD |
5047 | session->creation_time, |
5048 | session->name_contains_creation_time); | |
ecd0f96d | 5049 | pthread_mutex_unlock(socket->lock); |
9a654598 | 5050 | if (status != LTTNG_OK) { |
6dc3064a DG |
5051 | rcu_read_unlock(); |
5052 | goto error; | |
5053 | } | |
5054 | } | |
5055 | rcu_read_unlock(); | |
5056 | ||
5057 | error: | |
9a654598 | 5058 | return status; |
6dc3064a DG |
5059 | } |
5060 | ||
5061 | /* | |
5062 | * Record a kernel snapshot. | |
5063 | * | |
fac41e72 | 5064 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a | 5065 | */ |
fb9a95c4 JG |
5066 | static enum lttng_error_code record_kernel_snapshot( |
5067 | struct ltt_kernel_session *ksess, | |
348a81dc | 5068 | const struct consumer_output *output, |
fb9a95c4 | 5069 | const struct ltt_session *session, |
d07ceecd | 5070 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a | 5071 | { |
9a654598 | 5072 | enum lttng_error_code status; |
6dc3064a DG |
5073 | |
5074 | assert(ksess); | |
5075 | assert(output); | |
5076 | assert(session); | |
5077 | ||
348a81dc JG |
5078 | status = kernel_snapshot_record( |
5079 | ksess, output, wait, nb_packets_per_stream); | |
9a654598 | 5080 | return status; |
6dc3064a DG |
5081 | } |
5082 | ||
5083 | /* | |
5084 | * Record a UST snapshot. | |
5085 | * | |
9a654598 | 5086 | * Returns LTTNG_OK on success or a LTTNG_ERR error code. |
6dc3064a | 5087 | */ |
9a654598 | 5088 | static enum lttng_error_code record_ust_snapshot(struct ltt_ust_session *usess, |
348a81dc JG |
5089 | const struct consumer_output *output, |
5090 | const struct ltt_session *session, | |
5091 | int wait, uint64_t nb_packets_per_stream) | |
6dc3064a | 5092 | { |
9a654598 | 5093 | enum lttng_error_code status; |
6dc3064a DG |
5094 | |
5095 | assert(usess); | |
5096 | assert(output); | |
5097 | assert(session); | |
5098 | ||
348a81dc JG |
5099 | status = ust_app_snapshot_record( |
5100 | usess, output, wait, nb_packets_per_stream); | |
9a654598 | 5101 | return status; |
6dc3064a DG |
5102 | } |
5103 | ||
d07ceecd | 5104 | static |
fb9a95c4 JG |
5105 | uint64_t get_session_size_one_more_packet_per_stream( |
5106 | const struct ltt_session *session, uint64_t cur_nr_packets) | |
68808f4e | 5107 | { |
d07ceecd | 5108 | uint64_t tot_size = 0; |
68808f4e DG |
5109 | |
5110 | if (session->kernel_session) { | |
5111 | struct ltt_kernel_channel *chan; | |
fb9a95c4 JG |
5112 | const struct ltt_kernel_session *ksess = |
5113 | session->kernel_session; | |
68808f4e | 5114 | |
68808f4e | 5115 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
d07ceecd MD |
5116 | if (cur_nr_packets >= chan->channel->attr.num_subbuf) { |
5117 | /* | |
5118 | * Don't take channel into account if we | |
5119 | * already grab all its packets. | |
5120 | */ | |
5121 | continue; | |
68808f4e | 5122 | } |
d07ceecd MD |
5123 | tot_size += chan->channel->attr.subbuf_size |
5124 | * chan->stream_count; | |
68808f4e DG |
5125 | } |
5126 | } | |
5127 | ||
5128 | if (session->ust_session) { | |
fb9a95c4 | 5129 | const struct ltt_ust_session *usess = session->ust_session; |
68808f4e | 5130 | |
d07ceecd MD |
5131 | tot_size += ust_app_get_size_one_more_packet_per_stream(usess, |
5132 | cur_nr_packets); | |
68808f4e DG |
5133 | } |
5134 | ||
d07ceecd | 5135 | return tot_size; |
68808f4e DG |
5136 | } |
5137 | ||
5c786ded | 5138 | /* |
d07ceecd MD |
5139 | * Calculate the number of packets we can grab from each stream that |
5140 | * fits within the overall snapshot max size. | |
5141 | * | |
5142 | * Returns -1 on error, 0 means infinite number of packets, else > 0 is | |
5143 | * the number of packets per stream. | |
5144 | * | |
5145 | * TODO: this approach is not perfect: we consider the worse case | |
5146 | * (packet filling the sub-buffers) as an upper bound, but we could do | |
5147 | * better if we do this calculation while we actually grab the packet | |
5148 | * content: we would know how much padding we don't actually store into | |
5149 | * the file. | |
5150 | * | |
5151 | * This algorithm is currently bounded by the number of packets per | |
5152 | * stream. | |
5153 | * | |
5154 | * Since we call this algorithm before actually grabbing the data, it's | |
5155 | * an approximation: for instance, applications could appear/disappear | |
5156 | * in between this call and actually grabbing data. | |
5c786ded | 5157 | */ |
d07ceecd | 5158 | static |
fb9a95c4 JG |
5159 | int64_t get_session_nb_packets_per_stream(const struct ltt_session *session, |
5160 | uint64_t max_size) | |
5c786ded | 5161 | { |
d07ceecd MD |
5162 | int64_t size_left; |
5163 | uint64_t cur_nb_packets = 0; | |
5c786ded | 5164 | |
d07ceecd MD |
5165 | if (!max_size) { |
5166 | return 0; /* Infinite */ | |
5c786ded JD |
5167 | } |
5168 | ||
d07ceecd MD |
5169 | size_left = max_size; |
5170 | for (;;) { | |
5171 | uint64_t one_more_packet_tot_size; | |
5c786ded | 5172 | |
fb9a95c4 JG |
5173 | one_more_packet_tot_size = get_session_size_one_more_packet_per_stream( |
5174 | session, cur_nb_packets); | |
d07ceecd MD |
5175 | if (!one_more_packet_tot_size) { |
5176 | /* We are already grabbing all packets. */ | |
5177 | break; | |
5178 | } | |
5179 | size_left -= one_more_packet_tot_size; | |
5180 | if (size_left < 0) { | |
5181 | break; | |
5182 | } | |
5183 | cur_nb_packets++; | |
5c786ded | 5184 | } |
aecf2da5 | 5185 | if (!cur_nb_packets && size_left != max_size) { |
d07ceecd MD |
5186 | /* Not enough room to grab one packet of each stream, error. */ |
5187 | return -1; | |
5188 | } | |
5189 | return cur_nb_packets; | |
5c786ded JD |
5190 | } |
5191 | ||
fb9a95c4 | 5192 | static |
d2956687 | 5193 | enum lttng_error_code snapshot_record(struct ltt_session *session, |
fb9a95c4 JG |
5194 | const struct snapshot_output *snapshot_output, int wait) |
5195 | { | |
5196 | int64_t nb_packets_per_stream; | |
d2956687 | 5197 | char snapshot_chunk_name[LTTNG_NAME_MAX]; |
348a81dc JG |
5198 | int ret; |
5199 | enum lttng_error_code ret_code = LTTNG_OK; | |
d2956687 | 5200 | struct lttng_trace_chunk *snapshot_trace_chunk; |
348a81dc JG |
5201 | struct consumer_output *original_ust_consumer_output = NULL; |
5202 | struct consumer_output *original_kernel_consumer_output = NULL; | |
5203 | struct consumer_output *snapshot_ust_consumer_output = NULL; | |
5204 | struct consumer_output *snapshot_kernel_consumer_output = NULL; | |
d2956687 | 5205 | |
348a81dc | 5206 | ret = snprintf(snapshot_chunk_name, sizeof(snapshot_chunk_name), |
d2956687 JG |
5207 | "%s-%s-%" PRIu64, |
5208 | snapshot_output->name, | |
5209 | snapshot_output->datetime, | |
5210 | snapshot_output->nb_snapshot); | |
348a81dc | 5211 | if (ret < 0 || ret >= sizeof(snapshot_chunk_name)) { |
d2956687 | 5212 | ERR("Failed to format snapshot name"); |
348a81dc JG |
5213 | ret_code = LTTNG_ERR_INVALID; |
5214 | goto error; | |
d2956687 JG |
5215 | } |
5216 | DBG("Recording snapshot \"%s\" for session \"%s\" with chunk name \"%s\"", | |
5217 | snapshot_output->name, session->name, | |
5218 | snapshot_chunk_name); | |
348a81dc JG |
5219 | if (!session->kernel_session && !session->ust_session) { |
5220 | ERR("Failed to record snapshot as no channels exist"); | |
5221 | ret_code = LTTNG_ERR_NO_CHANNEL; | |
5222 | goto error; | |
5223 | } | |
5224 | ||
5225 | if (session->kernel_session) { | |
5226 | original_kernel_consumer_output = | |
5227 | session->kernel_session->consumer; | |
5228 | snapshot_kernel_consumer_output = | |
5229 | consumer_copy_output(snapshot_output->consumer); | |
3b967712 MD |
5230 | strcpy(snapshot_kernel_consumer_output->chunk_path, |
5231 | snapshot_chunk_name); | |
e4061179 JR |
5232 | |
5233 | /* Copy the original domain subdir. */ | |
5234 | strcpy(snapshot_kernel_consumer_output->domain_subdir, | |
5235 | original_kernel_consumer_output->domain_subdir); | |
5236 | ||
348a81dc JG |
5237 | ret = consumer_copy_sockets(snapshot_kernel_consumer_output, |
5238 | original_kernel_consumer_output); | |
5239 | if (ret < 0) { | |
5240 | ERR("Failed to copy consumer sockets from snapshot output configuration"); | |
5241 | ret_code = LTTNG_ERR_NOMEM; | |
5242 | goto error; | |
5243 | } | |
5244 | ret_code = set_relayd_for_snapshot( | |
5245 | snapshot_kernel_consumer_output, session); | |
5246 | if (ret_code != LTTNG_OK) { | |
5247 | ERR("Failed to setup relay daemon for kernel tracer snapshot"); | |
5248 | goto error; | |
5249 | } | |
5250 | session->kernel_session->consumer = | |
5251 | snapshot_kernel_consumer_output; | |
5252 | } | |
5253 | if (session->ust_session) { | |
5254 | original_ust_consumer_output = session->ust_session->consumer; | |
5255 | snapshot_ust_consumer_output = | |
5256 | consumer_copy_output(snapshot_output->consumer); | |
3b967712 MD |
5257 | strcpy(snapshot_ust_consumer_output->chunk_path, |
5258 | snapshot_chunk_name); | |
e4061179 JR |
5259 | |
5260 | /* Copy the original domain subdir. */ | |
5261 | strcpy(snapshot_ust_consumer_output->domain_subdir, | |
5262 | original_ust_consumer_output->domain_subdir); | |
5263 | ||
348a81dc JG |
5264 | ret = consumer_copy_sockets(snapshot_ust_consumer_output, |
5265 | original_ust_consumer_output); | |
5266 | if (ret < 0) { | |
5267 | ERR("Failed to copy consumer sockets from snapshot output configuration"); | |
5268 | ret_code = LTTNG_ERR_NOMEM; | |
5269 | goto error; | |
5270 | } | |
5271 | ret_code = set_relayd_for_snapshot( | |
5272 | snapshot_ust_consumer_output, session); | |
5273 | if (ret_code != LTTNG_OK) { | |
5274 | ERR("Failed to setup relay daemon for userspace tracer snapshot"); | |
5275 | goto error; | |
5276 | } | |
5277 | session->ust_session->consumer = | |
5278 | snapshot_ust_consumer_output; | |
5279 | } | |
5280 | ||
d2956687 | 5281 | snapshot_trace_chunk = session_create_new_trace_chunk(session, |
348a81dc JG |
5282 | snapshot_kernel_consumer_output ?: |
5283 | snapshot_ust_consumer_output, | |
5284 | consumer_output_get_base_path( | |
5285 | snapshot_output->consumer), | |
d2956687 JG |
5286 | snapshot_chunk_name); |
5287 | if (!snapshot_trace_chunk) { | |
348a81dc JG |
5288 | ERR("Failed to create temporary trace chunk to record a snapshot of session \"%s\"", |
5289 | session->name); | |
5290 | ret_code = LTTNG_ERR_CREATE_DIR_FAIL; | |
5291 | goto error; | |
d2956687 JG |
5292 | } |
5293 | assert(!session->current_trace_chunk); | |
5294 | ret = session_set_trace_chunk(session, snapshot_trace_chunk, NULL); | |
5295 | lttng_trace_chunk_put(snapshot_trace_chunk); | |
5296 | snapshot_trace_chunk = NULL; | |
5297 | if (ret) { | |
348a81dc JG |
5298 | ERR("Failed to set temporary trace chunk to record a snapshot of session \"%s\"", |
5299 | session->name); | |
5300 | ret_code = LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER; | |
5301 | goto error; | |
d2956687 | 5302 | } |
fb9a95c4 JG |
5303 | |
5304 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
5305 | snapshot_output->max_size); | |
5306 | if (nb_packets_per_stream < 0) { | |
348a81dc | 5307 | ret_code = LTTNG_ERR_MAX_SIZE_INVALID; |
5151d412 | 5308 | goto error_close_trace_chunk; |
fb9a95c4 JG |
5309 | } |
5310 | ||
5311 | if (session->kernel_session) { | |
348a81dc JG |
5312 | ret_code = record_kernel_snapshot(session->kernel_session, |
5313 | snapshot_kernel_consumer_output, session, | |
fb9a95c4 | 5314 | wait, nb_packets_per_stream); |
348a81dc | 5315 | if (ret_code != LTTNG_OK) { |
5151d412 | 5316 | goto error_close_trace_chunk; |
fb9a95c4 JG |
5317 | } |
5318 | } | |
5319 | ||
5320 | if (session->ust_session) { | |
348a81dc JG |
5321 | ret_code = record_ust_snapshot(session->ust_session, |
5322 | snapshot_ust_consumer_output, session, | |
fb9a95c4 | 5323 | wait, nb_packets_per_stream); |
348a81dc | 5324 | if (ret_code != LTTNG_OK) { |
5151d412 | 5325 | goto error_close_trace_chunk; |
fb9a95c4 JG |
5326 | } |
5327 | } | |
d2956687 | 5328 | |
5151d412 | 5329 | error_close_trace_chunk: |
dbfee52c MD |
5330 | if (session_set_trace_chunk(session, NULL, &snapshot_trace_chunk)) { |
5331 | ERR("Failed to release the current trace chunk of session \"%s\"", | |
5332 | session->name); | |
5333 | ret_code = LTTNG_ERR_UNK; | |
5334 | } | |
5335 | ||
5336 | if (session_close_trace_chunk(session, snapshot_trace_chunk, | |
343defc2 | 5337 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION, NULL)) { |
d2956687 JG |
5338 | /* |
5339 | * Don't goto end; make sure the chunk is closed for the session | |
5340 | * to allow future snapshots. | |
5341 | */ | |
5342 | ERR("Failed to close snapshot trace chunk of session \"%s\"", | |
5343 | session->name); | |
348a81dc | 5344 | ret_code = LTTNG_ERR_CLOSE_TRACE_CHUNK_FAIL_CONSUMER; |
d2956687 | 5345 | } |
0cb53ff7 JG |
5346 | |
5347 | lttng_trace_chunk_put(snapshot_trace_chunk); | |
5348 | snapshot_trace_chunk = NULL; | |
348a81dc JG |
5349 | error: |
5350 | if (original_ust_consumer_output) { | |
5351 | session->ust_session->consumer = original_ust_consumer_output; | |
5352 | } | |
5353 | if (original_kernel_consumer_output) { | |
5354 | session->kernel_session->consumer = | |
5355 | original_kernel_consumer_output; | |
5356 | } | |
5357 | consumer_output_put(snapshot_ust_consumer_output); | |
5358 | consumer_output_put(snapshot_kernel_consumer_output); | |
5359 | return ret_code; | |
fb9a95c4 JG |
5360 | } |
5361 | ||
6dc3064a DG |
5362 | /* |
5363 | * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl. | |
5364 | * | |
5365 | * The wait parameter is ignored so this call always wait for the snapshot to | |
5366 | * complete before returning. | |
5367 | * | |
5368 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
5369 | */ | |
5370 | int cmd_snapshot_record(struct ltt_session *session, | |
df4f5a87 | 5371 | const struct lttng_snapshot_output *output, int wait) |
6dc3064a | 5372 | { |
9a654598 JG |
5373 | enum lttng_error_code cmd_ret = LTTNG_OK; |
5374 | int ret; | |
00e1dfc4 | 5375 | unsigned int snapshot_success = 0; |
10ba83fe | 5376 | char datetime[16]; |
2abe7969 | 5377 | struct snapshot_output *tmp_output = NULL; |
6dc3064a DG |
5378 | |
5379 | assert(session); | |
ba45d9f0 | 5380 | assert(output); |
6dc3064a DG |
5381 | |
5382 | DBG("Cmd snapshot record for session %s", session->name); | |
5383 | ||
10ba83fe JR |
5384 | /* Get the datetime for the snapshot output directory. */ |
5385 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", datetime, | |
5386 | sizeof(datetime)); | |
5387 | if (!ret) { | |
9a654598 | 5388 | cmd_ret = LTTNG_ERR_INVALID; |
10ba83fe JR |
5389 | goto error; |
5390 | } | |
5391 | ||
6dc3064a | 5392 | /* |
d3f14b8a MD |
5393 | * Permission denied to create an output if the session is not |
5394 | * set in no output mode. | |
6dc3064a DG |
5395 | */ |
5396 | if (session->output_traces) { | |
9a654598 | 5397 | cmd_ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
5398 | goto error; |
5399 | } | |
5400 | ||
5401 | /* The session needs to be started at least once. */ | |
8382cf6f | 5402 | if (!session->has_been_started) { |
9a654598 | 5403 | cmd_ret = LTTNG_ERR_START_SESSION_ONCE; |
6dc3064a DG |
5404 | goto error; |
5405 | } | |
5406 | ||
5407 | /* Use temporary output for the session. */ | |
ba45d9f0 | 5408 | if (*output->ctrl_url != '\0') { |
2abe7969 JG |
5409 | tmp_output = snapshot_output_alloc(); |
5410 | if (!tmp_output) { | |
5411 | cmd_ret = LTTNG_ERR_NOMEM; | |
5412 | goto error; | |
5413 | } | |
5414 | ||
b178f53e JG |
5415 | ret = snapshot_output_init(session, output->max_size, |
5416 | output->name, | |
5417 | output->ctrl_url, output->data_url, | |
5418 | session->consumer, | |
2abe7969 | 5419 | tmp_output, NULL); |
6dc3064a DG |
5420 | if (ret < 0) { |
5421 | if (ret == -ENOMEM) { | |
9a654598 | 5422 | cmd_ret = LTTNG_ERR_NOMEM; |
6dc3064a | 5423 | } else { |
9a654598 | 5424 | cmd_ret = LTTNG_ERR_INVALID; |
6dc3064a DG |
5425 | } |
5426 | goto error; | |
5427 | } | |
1bfe7328 | 5428 | /* Use the global session count for the temporary snapshot. */ |
2abe7969 | 5429 | tmp_output->nb_snapshot = session->snapshot.nb_snapshot; |
10ba83fe JR |
5430 | |
5431 | /* Use the global datetime */ | |
2abe7969 JG |
5432 | memcpy(tmp_output->datetime, datetime, sizeof(datetime)); |
5433 | cmd_ret = snapshot_record(session, tmp_output, wait); | |
fb9a95c4 | 5434 | if (cmd_ret != LTTNG_OK) { |
804c90a8 JR |
5435 | goto error; |
5436 | } | |
804c90a8 JR |
5437 | snapshot_success = 1; |
5438 | } else { | |
5439 | struct snapshot_output *sout; | |
5440 | struct lttng_ht_iter iter; | |
68808f4e | 5441 | |
804c90a8 JR |
5442 | rcu_read_lock(); |
5443 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
5444 | &iter.iter, sout, node.node) { | |
2abe7969 JG |
5445 | struct snapshot_output output_copy; |
5446 | ||
804c90a8 | 5447 | /* |
2abe7969 JG |
5448 | * Make a local copy of the output and override output |
5449 | * parameters with those provided as part of the | |
5450 | * command. | |
804c90a8 | 5451 | */ |
2abe7969 | 5452 | memcpy(&output_copy, sout, sizeof(output_copy)); |
1bfe7328 | 5453 | |
804c90a8 | 5454 | if (output->max_size != (uint64_t) -1ULL) { |
2abe7969 | 5455 | output_copy.max_size = output->max_size; |
6dc3064a | 5456 | } |
d07ceecd | 5457 | |
2abe7969 JG |
5458 | output_copy.nb_snapshot = session->snapshot.nb_snapshot; |
5459 | memcpy(output_copy.datetime, datetime, | |
5460 | sizeof(datetime)); | |
6dc3064a | 5461 | |
804c90a8 JR |
5462 | /* Use temporary name. */ |
5463 | if (*output->name != '\0') { | |
2abe7969 JG |
5464 | if (lttng_strncpy(output_copy.name, |
5465 | output->name, | |
5466 | sizeof(output_copy.name))) { | |
9a654598 | 5467 | cmd_ret = LTTNG_ERR_INVALID; |
cf3e357d MD |
5468 | rcu_read_unlock(); |
5469 | goto error; | |
5470 | } | |
804c90a8 | 5471 | } |
e1986656 | 5472 | |
2abe7969 | 5473 | cmd_ret = snapshot_record(session, &output_copy, wait); |
fb9a95c4 JG |
5474 | if (cmd_ret != LTTNG_OK) { |
5475 | rcu_read_unlock(); | |
5476 | goto error; | |
6dc3064a | 5477 | } |
804c90a8 | 5478 | snapshot_success = 1; |
6dc3064a | 5479 | } |
804c90a8 | 5480 | rcu_read_unlock(); |
6dc3064a DG |
5481 | } |
5482 | ||
1bfe7328 DG |
5483 | if (snapshot_success) { |
5484 | session->snapshot.nb_snapshot++; | |
b67578cb | 5485 | } else { |
9a654598 | 5486 | cmd_ret = LTTNG_ERR_SNAPSHOT_FAIL; |
1bfe7328 DG |
5487 | } |
5488 | ||
6dc3064a | 5489 | error: |
2abe7969 JG |
5490 | if (tmp_output) { |
5491 | snapshot_output_destroy(tmp_output); | |
5492 | } | |
9a654598 | 5493 | return cmd_ret; |
6dc3064a DG |
5494 | } |
5495 | ||
d7ba1388 MD |
5496 | /* |
5497 | * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread. | |
5498 | */ | |
5499 | int cmd_set_session_shm_path(struct ltt_session *session, | |
5500 | const char *shm_path) | |
5501 | { | |
5502 | /* Safety net */ | |
5503 | assert(session); | |
5504 | ||
5505 | /* | |
5506 | * Can only set shm path before session is started. | |
5507 | */ | |
5508 | if (session->has_been_started) { | |
5509 | return LTTNG_ERR_SESSION_STARTED; | |
5510 | } | |
5511 | ||
5512 | strncpy(session->shm_path, shm_path, | |
5513 | sizeof(session->shm_path)); | |
5514 | session->shm_path[sizeof(session->shm_path) - 1] = '\0'; | |
5515 | ||
7e397c55 | 5516 | return LTTNG_OK; |
d7ba1388 MD |
5517 | } |
5518 | ||
5c408ad8 JD |
5519 | /* |
5520 | * Command LTTNG_ROTATE_SESSION from the lttng-ctl library. | |
5521 | * | |
5522 | * Ask the consumer to rotate the session output directory. | |
5523 | * The session lock must be held. | |
5524 | * | |
d5a1b7aa | 5525 | * Returns LTTNG_OK on success or else a negative LTTng error code. |
5c408ad8 JD |
5526 | */ |
5527 | int cmd_rotate_session(struct ltt_session *session, | |
7fdbed1c | 5528 | struct lttng_rotate_session_return *rotate_return, |
343defc2 MD |
5529 | bool quiet_rotation, |
5530 | enum lttng_trace_chunk_command_type command) | |
5c408ad8 JD |
5531 | { |
5532 | int ret; | |
d2956687 | 5533 | uint64_t ongoing_rotation_chunk_id; |
d5a1b7aa | 5534 | enum lttng_error_code cmd_ret = LTTNG_OK; |
d2956687 JG |
5535 | struct lttng_trace_chunk *chunk_being_archived = NULL; |
5536 | struct lttng_trace_chunk *new_trace_chunk = NULL; | |
5537 | enum lttng_trace_chunk_status chunk_status; | |
3156892b JG |
5538 | bool failed_to_rotate = false; |
5539 | enum lttng_error_code rotation_fail_code = LTTNG_OK; | |
5c408ad8 JD |
5540 | |
5541 | assert(session); | |
5542 | ||
5543 | if (!session->has_been_started) { | |
d5a1b7aa | 5544 | cmd_ret = LTTNG_ERR_START_SESSION_ONCE; |
d68c9a04 | 5545 | goto end; |
5c408ad8 JD |
5546 | } |
5547 | ||
d48d65e1 MD |
5548 | /* |
5549 | * Explicit rotation is not supported for live sessions. | |
5550 | * However, live sessions can perform a quiet rotation on | |
5551 | * destroy. | |
5552 | * Rotation is not supported for snapshot traces (no output). | |
5553 | */ | |
5554 | if ((!quiet_rotation && session->live_timer) || | |
5555 | !session->output_traces) { | |
d5a1b7aa | 5556 | cmd_ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE; |
d68c9a04 | 5557 | goto end; |
5c408ad8 JD |
5558 | } |
5559 | ||
d2956687 | 5560 | /* Unsupported feature in lttng-relayd before 2.11. */ |
070b6a86 | 5561 | if (!quiet_rotation && session->consumer->type == CONSUMER_DST_NET && |
5c408ad8 JD |
5562 | (session->consumer->relay_major_version == 2 && |
5563 | session->consumer->relay_minor_version < 11)) { | |
d5a1b7aa | 5564 | cmd_ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE_RELAY; |
d68c9a04 | 5565 | goto end; |
5c408ad8 JD |
5566 | } |
5567 | ||
a40a503f MD |
5568 | /* Unsupported feature in lttng-modules before 2.8 (lack of sequence number). */ |
5569 | if (session->kernel_session && !kernel_supports_ring_buffer_packet_sequence_number()) { | |
5570 | cmd_ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE_KERNEL; | |
5571 | goto end; | |
5572 | } | |
5573 | ||
92816cc3 | 5574 | if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) { |
92816cc3 JG |
5575 | DBG("Refusing to launch a rotation; a rotation is already in progress for session %s", |
5576 | session->name); | |
d5a1b7aa | 5577 | cmd_ret = LTTNG_ERR_ROTATION_PENDING; |
d68c9a04 | 5578 | goto end; |
5c408ad8 JD |
5579 | } |
5580 | ||
5581 | /* | |
5582 | * After a stop, we only allow one rotation to occur, the other ones are | |
5583 | * useless until a new start. | |
5584 | */ | |
5585 | if (session->rotated_after_last_stop) { | |
5586 | DBG("Session \"%s\" was already rotated after stop, refusing rotation", | |
5587 | session->name); | |
d5a1b7aa | 5588 | cmd_ret = LTTNG_ERR_ROTATION_MULTIPLE_AFTER_STOP; |
d68c9a04 | 5589 | goto end; |
5c408ad8 | 5590 | } |
b02f5986 MD |
5591 | |
5592 | /* | |
5593 | * After a stop followed by a clear, disallow following rotations a they would | |
5594 | * generate empty chunks. | |
5595 | */ | |
5596 | if (session->cleared_after_last_stop) { | |
5597 | DBG("Session \"%s\" was already cleared after stop, refusing rotation", | |
5598 | session->name); | |
5599 | cmd_ret = LTTNG_ERR_ROTATION_AFTER_STOP_CLEAR; | |
5600 | goto end; | |
5601 | } | |
5602 | ||
d2956687 | 5603 | if (session->active) { |
348a81dc | 5604 | new_trace_chunk = session_create_new_trace_chunk(session, NULL, |
d2956687 JG |
5605 | NULL, NULL); |
5606 | if (!new_trace_chunk) { | |
5607 | cmd_ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
5608 | goto error; | |
5c408ad8 | 5609 | } |
0e270a1e | 5610 | } |
2961f09e | 5611 | |
3156892b JG |
5612 | /* |
5613 | * The current trace chunk becomes the chunk being archived. | |
5614 | * | |
5615 | * After this point, "chunk_being_archived" must absolutely | |
5616 | * be closed on the consumer(s), otherwise it will never be | |
5617 | * cleaned-up, which will result in a leak. | |
5618 | */ | |
d2956687 JG |
5619 | ret = session_set_trace_chunk(session, new_trace_chunk, |
5620 | &chunk_being_archived); | |
5621 | if (ret) { | |
5622 | cmd_ret = LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER; | |
b178f53e JG |
5623 | goto error; |
5624 | } | |
5625 | ||
5c408ad8 | 5626 | if (session->kernel_session) { |
d5a1b7aa JG |
5627 | cmd_ret = kernel_rotate_session(session); |
5628 | if (cmd_ret != LTTNG_OK) { | |
3156892b JG |
5629 | failed_to_rotate = true; |
5630 | rotation_fail_code = cmd_ret; | |
5c408ad8 JD |
5631 | } |
5632 | } | |
5633 | if (session->ust_session) { | |
d5a1b7aa JG |
5634 | cmd_ret = ust_app_rotate_session(session); |
5635 | if (cmd_ret != LTTNG_OK) { | |
3156892b JG |
5636 | failed_to_rotate = true; |
5637 | rotation_fail_code = cmd_ret; | |
5c408ad8 | 5638 | } |
92816cc3 | 5639 | } |
17dd1232 | 5640 | |
3b61d9ee JG |
5641 | if (!session->active) { |
5642 | session->rotated_after_last_stop = true; | |
5643 | } | |
5644 | ||
5645 | if (!chunk_being_archived) { | |
5646 | DBG("Rotating session \"%s\" from a \"NULL\" trace chunk to a new trace chunk, skipping completion check", | |
5647 | session->name); | |
5648 | if (failed_to_rotate) { | |
5649 | cmd_ret = rotation_fail_code; | |
5650 | goto error; | |
5651 | } | |
5652 | cmd_ret = LTTNG_OK; | |
5653 | goto end; | |
5654 | } | |
5655 | ||
5656 | session->rotation_state = LTTNG_ROTATION_STATE_ONGOING; | |
5657 | chunk_status = lttng_trace_chunk_get_id(chunk_being_archived, | |
5658 | &ongoing_rotation_chunk_id); | |
5659 | assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); | |
5660 | ||
bbc4768c | 5661 | ret = session_close_trace_chunk(session, chunk_being_archived, |
343defc2 | 5662 | command, session->last_chunk_path); |
d2956687 JG |
5663 | if (ret) { |
5664 | cmd_ret = LTTNG_ERR_CLOSE_TRACE_CHUNK_FAIL_CONSUMER; | |
5665 | goto error; | |
5666 | } | |
5667 | ||
3156892b JG |
5668 | if (failed_to_rotate) { |
5669 | cmd_ret = rotation_fail_code; | |
5670 | goto error; | |
5671 | } | |
5672 | ||
7fdbed1c | 5673 | session->quiet_rotation = quiet_rotation; |
92816cc3 JG |
5674 | ret = timer_session_rotation_pending_check_start(session, |
5675 | DEFAULT_ROTATE_PENDING_TIMER); | |
5676 | if (ret) { | |
d5a1b7aa | 5677 | cmd_ret = LTTNG_ERR_UNK; |
2961f09e | 5678 | goto error; |
5c408ad8 JD |
5679 | } |
5680 | ||
5c408ad8 | 5681 | if (rotate_return) { |
d2956687 | 5682 | rotate_return->rotation_id = ongoing_rotation_chunk_id; |
5c408ad8 JD |
5683 | } |
5684 | ||
d2956687 JG |
5685 | session->chunk_being_archived = chunk_being_archived; |
5686 | chunk_being_archived = NULL; | |
7fdbed1c JG |
5687 | if (!quiet_rotation) { |
5688 | ret = notification_thread_command_session_rotation_ongoing( | |
412d7227 SM |
5689 | the_notification_thread_handle, session->name, |
5690 | session->uid, session->gid, | |
7fdbed1c JG |
5691 | ongoing_rotation_chunk_id); |
5692 | if (ret != LTTNG_OK) { | |
5693 | ERR("Failed to notify notification thread that a session rotation is ongoing for session %s", | |
5694 | session->name); | |
5695 | cmd_ret = ret; | |
5696 | } | |
2961f09e JG |
5697 | } |
5698 | ||
92816cc3 | 5699 | DBG("Cmd rotate session %s, archive_id %" PRIu64 " sent", |
d2956687 | 5700 | session->name, ongoing_rotation_chunk_id); |
5c408ad8 | 5701 | end: |
d2956687 JG |
5702 | lttng_trace_chunk_put(new_trace_chunk); |
5703 | lttng_trace_chunk_put(chunk_being_archived); | |
d5a1b7aa | 5704 | ret = (cmd_ret == LTTNG_OK) ? cmd_ret : -((int) cmd_ret); |
5c408ad8 | 5705 | return ret; |
2961f09e | 5706 | error: |
2961f09e | 5707 | if (session_reset_rotation_state(session, |
d2956687 | 5708 | LTTNG_ROTATION_STATE_ERROR)) { |
2961f09e JG |
5709 | ERR("Failed to reset rotation state of session \"%s\"", |
5710 | session->name); | |
5711 | } | |
5712 | goto end; | |
5c408ad8 JD |
5713 | } |
5714 | ||
5715 | /* | |
d68c9a04 | 5716 | * Command LTTNG_ROTATION_GET_INFO from the lttng-ctl library. |
5c408ad8 JD |
5717 | * |
5718 | * Check if the session has finished its rotation. | |
5719 | * | |
d2956687 | 5720 | * Return LTTNG_OK on success or else an LTTNG_ERR code. |
5c408ad8 | 5721 | */ |
d68c9a04 JD |
5722 | int cmd_rotate_get_info(struct ltt_session *session, |
5723 | struct lttng_rotation_get_info_return *info_return, | |
5724 | uint64_t rotation_id) | |
5c408ad8 | 5725 | { |
d2956687 JG |
5726 | enum lttng_error_code cmd_ret = LTTNG_OK; |
5727 | enum lttng_rotation_state rotation_state; | |
5c408ad8 | 5728 | |
d68c9a04 | 5729 | DBG("Cmd rotate_get_info session %s, rotation id %" PRIu64, session->name, |
d2956687 | 5730 | session->most_recent_chunk_id.value); |
5c408ad8 | 5731 | |
d2956687 JG |
5732 | if (session->chunk_being_archived) { |
5733 | enum lttng_trace_chunk_status chunk_status; | |
5734 | uint64_t chunk_id; | |
5735 | ||
5736 | chunk_status = lttng_trace_chunk_get_id( | |
5737 | session->chunk_being_archived, | |
5738 | &chunk_id); | |
5739 | assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); | |
5740 | ||
5741 | rotation_state = rotation_id == chunk_id ? | |
5742 | LTTNG_ROTATION_STATE_ONGOING : | |
5743 | LTTNG_ROTATION_STATE_EXPIRED; | |
5744 | } else { | |
5745 | if (session->last_archived_chunk_id.is_set && | |
5746 | rotation_id != session->last_archived_chunk_id.value) { | |
5747 | rotation_state = LTTNG_ROTATION_STATE_EXPIRED; | |
5748 | } else { | |
5749 | rotation_state = session->rotation_state; | |
5750 | } | |
5c408ad8 JD |
5751 | } |
5752 | ||
d2956687 JG |
5753 | switch (rotation_state) { |
5754 | case LTTNG_ROTATION_STATE_NO_ROTATION: | |
83ed9e90 | 5755 | DBG("Reporting that no rotation has occurred within the lifetime of session \"%s\"", |
d2956687 JG |
5756 | session->name); |
5757 | goto end; | |
5758 | case LTTNG_ROTATION_STATE_EXPIRED: | |
5759 | DBG("Reporting that the rotation state of rotation id %" PRIu64 " of session \"%s\" has expired", | |
5760 | rotation_id, session->name); | |
5761 | break; | |
d68c9a04 | 5762 | case LTTNG_ROTATION_STATE_ONGOING: |
d2956687 | 5763 | DBG("Reporting that rotation id %" PRIu64 " of session \"%s\" is still pending", |
d68c9a04 JD |
5764 | rotation_id, session->name); |
5765 | break; | |
5766 | case LTTNG_ROTATION_STATE_COMPLETED: | |
dd73d57b | 5767 | { |
d2956687 JG |
5768 | int fmt_ret; |
5769 | char *chunk_path; | |
dd73d57b JG |
5770 | char *current_tracing_path_reply; |
5771 | size_t current_tracing_path_reply_len; | |
5772 | ||
d2956687 JG |
5773 | DBG("Reporting that rotation id %" PRIu64 " of session \"%s\" is completed", |
5774 | rotation_id, session->name); | |
5775 | ||
dd73d57b JG |
5776 | switch (session_get_consumer_destination_type(session)) { |
5777 | case CONSUMER_DST_LOCAL: | |
5778 | current_tracing_path_reply = | |
5779 | info_return->location.local.absolute_path; | |
5780 | current_tracing_path_reply_len = | |
5781 | sizeof(info_return->location.local.absolute_path); | |
5782 | info_return->location_type = | |
05f8afa9 | 5783 | (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_LOCAL; |
ecd1a12f MD |
5784 | fmt_ret = asprintf(&chunk_path, |
5785 | "%s/" DEFAULT_ARCHIVED_TRACE_CHUNKS_DIRECTORY "/%s", | |
5786 | session_get_base_path(session), | |
5787 | session->last_archived_chunk_name); | |
5788 | if (fmt_ret == -1) { | |
5789 | PERROR("Failed to format the path of the last archived trace chunk"); | |
5790 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; | |
5791 | cmd_ret = LTTNG_ERR_UNK; | |
5792 | goto end; | |
5793 | } | |
dd73d57b JG |
5794 | break; |
5795 | case CONSUMER_DST_NET: | |
09cfbe47 JG |
5796 | { |
5797 | uint16_t ctrl_port, data_port; | |
5798 | ||
dd73d57b JG |
5799 | current_tracing_path_reply = |
5800 | info_return->location.relay.relative_path; | |
5801 | current_tracing_path_reply_len = | |
5802 | sizeof(info_return->location.relay.relative_path); | |
5803 | /* Currently the only supported relay protocol. */ | |
5804 | info_return->location.relay.protocol = | |
05f8afa9 | 5805 | (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_RELAY_PROTOCOL_TYPE_TCP; |
dd73d57b | 5806 | |
d2956687 | 5807 | fmt_ret = lttng_strncpy(info_return->location.relay.host, |
dd73d57b JG |
5808 | session_get_net_consumer_hostname(session), |
5809 | sizeof(info_return->location.relay.host)); | |
d2956687 JG |
5810 | if (fmt_ret) { |
5811 | ERR("Failed to copy host name to rotate_get_info reply"); | |
dd73d57b | 5812 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; |
d2956687 | 5813 | cmd_ret = LTTNG_ERR_SET_URL; |
dd73d57b JG |
5814 | goto end; |
5815 | } | |
5816 | ||
09cfbe47 JG |
5817 | session_get_net_consumer_ports(session, &ctrl_port, &data_port); |
5818 | info_return->location.relay.ports.control = ctrl_port; | |
5819 | info_return->location.relay.ports.data = data_port; | |
dd73d57b | 5820 | info_return->location_type = |
05f8afa9 | 5821 | (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_RELAY; |
ecd1a12f MD |
5822 | chunk_path = strdup(session->last_chunk_path); |
5823 | if (!chunk_path) { | |
5824 | ERR("Failed to allocate the path of the last archived trace chunk"); | |
5825 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; | |
5826 | cmd_ret = LTTNG_ERR_UNK; | |
5827 | goto end; | |
5828 | } | |
dd73d57b | 5829 | break; |
09cfbe47 | 5830 | } |
dd73d57b JG |
5831 | default: |
5832 | abort(); | |
5833 | } | |
d2956687 JG |
5834 | |
5835 | fmt_ret = lttng_strncpy(current_tracing_path_reply, | |
5836 | chunk_path, current_tracing_path_reply_len); | |
5837 | free(chunk_path); | |
5838 | if (fmt_ret) { | |
5839 | ERR("Failed to copy path of the last archived trace chunk to rotate_get_info reply"); | |
d68c9a04 | 5840 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; |
d2956687 | 5841 | cmd_ret = LTTNG_ERR_UNK; |
5c408ad8 JD |
5842 | goto end; |
5843 | } | |
dd73d57b | 5844 | |
d68c9a04 | 5845 | break; |
dd73d57b | 5846 | } |
d68c9a04 | 5847 | case LTTNG_ROTATION_STATE_ERROR: |
d2956687 | 5848 | DBG("Reporting that an error occurred during rotation %" PRIu64 " of session \"%s\"", |
d68c9a04 JD |
5849 | rotation_id, session->name); |
5850 | break; | |
5851 | default: | |
5852 | abort(); | |
5c408ad8 JD |
5853 | } |
5854 | ||
d2956687 | 5855 | cmd_ret = LTTNG_OK; |
5c408ad8 | 5856 | end: |
d2956687 JG |
5857 | info_return->status = (int32_t) rotation_state; |
5858 | return cmd_ret; | |
5c408ad8 JD |
5859 | } |
5860 | ||
259c2674 JD |
5861 | /* |
5862 | * Command LTTNG_ROTATION_SET_SCHEDULE from the lttng-ctl library. | |
5863 | * | |
5864 | * Configure the automatic rotation parameters. | |
66ea93b1 JG |
5865 | * 'activate' to true means activate the rotation schedule type with 'new_value'. |
5866 | * 'activate' to false means deactivate the rotation schedule and validate that | |
5867 | * 'new_value' has the same value as the currently active value. | |
259c2674 | 5868 | * |
1136f41b | 5869 | * Return LTTNG_OK on success or else a positive LTTNG_ERR code. |
259c2674 JD |
5870 | */ |
5871 | int cmd_rotation_set_schedule(struct ltt_session *session, | |
66ea93b1 JG |
5872 | bool activate, enum lttng_rotation_schedule_type schedule_type, |
5873 | uint64_t new_value, | |
90936dcf | 5874 | struct notification_thread_handle *notification_thread_handle) |
259c2674 JD |
5875 | { |
5876 | int ret; | |
66ea93b1 | 5877 | uint64_t *parameter_value; |
259c2674 JD |
5878 | |
5879 | assert(session); | |
5880 | ||
5881 | DBG("Cmd rotate set schedule session %s", session->name); | |
5882 | ||
92fe5ca1 | 5883 | if (session->live_timer || !session->output_traces) { |
66ea93b1 | 5884 | DBG("Failing ROTATION_SET_SCHEDULE command as the rotation feature is not available for this session"); |
259c2674 JD |
5885 | ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE; |
5886 | goto end; | |
5887 | } | |
5888 | ||
66ea93b1 JG |
5889 | switch (schedule_type) { |
5890 | case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD: | |
5891 | parameter_value = &session->rotate_size; | |
5892 | break; | |
5893 | case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC: | |
5894 | parameter_value = &session->rotate_timer_period; | |
5895 | if (new_value >= UINT_MAX) { | |
5896 | DBG("Failing ROTATION_SET_SCHEDULE command as the value requested for a periodic rotation schedule is invalid: %" PRIu64 " > %u (UINT_MAX)", | |
5897 | new_value, UINT_MAX); | |
5898 | ret = LTTNG_ERR_INVALID; | |
5899 | goto end; | |
5900 | } | |
5901 | break; | |
5902 | default: | |
5903 | WARN("Failing ROTATION_SET_SCHEDULE command on unknown schedule type"); | |
5904 | ret = LTTNG_ERR_INVALID; | |
259c2674 | 5905 | goto end; |
66ea93b1 JG |
5906 | } |
5907 | ||
5908 | /* Improper use of the API. */ | |
5909 | if (new_value == -1ULL) { | |
5910 | WARN("Failing ROTATION_SET_SCHEDULE command as the value requested is -1"); | |
5911 | ret = LTTNG_ERR_INVALID; | |
259c2674 JD |
5912 | goto end; |
5913 | } | |
5914 | ||
66ea93b1 JG |
5915 | /* |
5916 | * As indicated in struct ltt_session's comments, a value of == 0 means | |
5917 | * this schedule rotation type is not in use. | |
5918 | * | |
5919 | * Reject the command if we were asked to activate a schedule that was | |
5920 | * already active. | |
5921 | */ | |
5922 | if (activate && *parameter_value != 0) { | |
5923 | DBG("Failing ROTATION_SET_SCHEDULE (activate) command as the schedule is already active"); | |
5924 | ret = LTTNG_ERR_ROTATION_SCHEDULE_SET; | |
90936dcf | 5925 | goto end; |
66ea93b1 JG |
5926 | } |
5927 | ||
5928 | /* | |
5929 | * Reject the command if we were asked to deactivate a schedule that was | |
5930 | * not active. | |
5931 | */ | |
5932 | if (!activate && *parameter_value == 0) { | |
5933 | DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as the schedule is already inactive"); | |
5934 | ret = LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET; | |
90936dcf JD |
5935 | goto end; |
5936 | } | |
5937 | ||
66ea93b1 JG |
5938 | /* |
5939 | * Reject the command if we were asked to deactivate a schedule that | |
5940 | * doesn't exist. | |
5941 | */ | |
5942 | if (!activate && *parameter_value != new_value) { | |
5943 | DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as an inexistant schedule was provided"); | |
5944 | ret = LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET; | |
5945 | goto end; | |
5946 | } | |
259c2674 | 5947 | |
66ea93b1 JG |
5948 | *parameter_value = activate ? new_value : 0; |
5949 | ||
5950 | switch (schedule_type) { | |
5951 | case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC: | |
5952 | if (activate && session->active) { | |
5953 | /* | |
5954 | * Only start the timer if the session is active, | |
5955 | * otherwise it will be started when the session starts. | |
5956 | */ | |
92816cc3 JG |
5957 | ret = timer_session_rotation_schedule_timer_start( |
5958 | session, new_value); | |
259c2674 | 5959 | if (ret) { |
66ea93b1 | 5960 | ERR("Failed to enable session rotation timer in ROTATION_SET_SCHEDULE command"); |
259c2674 JD |
5961 | ret = LTTNG_ERR_UNK; |
5962 | goto end; | |
5963 | } | |
66ea93b1 | 5964 | } else { |
92816cc3 JG |
5965 | ret = timer_session_rotation_schedule_timer_stop( |
5966 | session); | |
66ea93b1 JG |
5967 | if (ret) { |
5968 | ERR("Failed to disable session rotation timer in ROTATION_SET_SCHEDULE command"); | |
5969 | ret = LTTNG_ERR_UNK; | |
f3ce6946 | 5970 | goto end; |
66ea93b1 | 5971 | } |
259c2674 | 5972 | } |
66ea93b1 JG |
5973 | break; |
5974 | case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD: | |
5975 | if (activate) { | |
5976 | ret = subscribe_session_consumed_size_rotation(session, | |
5977 | new_value, notification_thread_handle); | |
90936dcf | 5978 | if (ret) { |
66ea93b1 | 5979 | ERR("Failed to enable consumed-size notification in ROTATION_SET_SCHEDULE command"); |
90936dcf JD |
5980 | ret = LTTNG_ERR_UNK; |
5981 | goto end; | |
5982 | } | |
90936dcf | 5983 | } else { |
66ea93b1 JG |
5984 | ret = unsubscribe_session_consumed_size_rotation(session, |
5985 | notification_thread_handle); | |
90936dcf | 5986 | if (ret) { |
66ea93b1 | 5987 | ERR("Failed to disable consumed-size notification in ROTATION_SET_SCHEDULE command"); |
90936dcf JD |
5988 | ret = LTTNG_ERR_UNK; |
5989 | goto end; | |
5990 | } | |
66ea93b1 | 5991 | |
90936dcf | 5992 | } |
66ea93b1 JG |
5993 | break; |
5994 | default: | |
5995 | /* Would have been caught before. */ | |
5996 | abort(); | |
90936dcf JD |
5997 | } |
5998 | ||
259c2674 JD |
5999 | ret = LTTNG_OK; |
6000 | ||
6001 | goto end; | |
6002 | ||
6003 | end: | |
6004 | return ret; | |
6005 | } | |
6006 | ||
a503e1ef JG |
6007 | /* Wait for a given path to be removed before continuing. */ |
6008 | static enum lttng_error_code wait_on_path(void *path_data) | |
6009 | { | |
6010 | const char *shm_path = path_data; | |
6011 | ||
6012 | DBG("Waiting for the shm path at %s to be removed before completing session destruction", | |
6013 | shm_path); | |
6014 | while (true) { | |
6015 | int ret; | |
6016 | struct stat st; | |
6017 | ||
6018 | ret = stat(shm_path, &st); | |
6019 | if (ret) { | |
6020 | if (errno != ENOENT) { | |
6021 | PERROR("stat() returned an error while checking for the existence of the shm path"); | |
6022 | } else { | |
6023 | DBG("shm path no longer exists, completing the destruction of session"); | |
6024 | } | |
6025 | break; | |
6026 | } else { | |
6027 | if (!S_ISDIR(st.st_mode)) { | |
6028 | ERR("The type of shm path %s returned by stat() is not a directory; aborting the wait for shm path removal", | |
6029 | shm_path); | |
6030 | break; | |
6031 | } | |
6032 | } | |
6033 | usleep(SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US); | |
6034 | } | |
6035 | return LTTNG_OK; | |
6036 | } | |
6037 | ||
6038 | /* | |
6039 | * Returns a pointer to a handler to run on completion of a command. | |
6040 | * Returns NULL if no handler has to be run for the last command executed. | |
6041 | */ | |
6042 | const struct cmd_completion_handler *cmd_pop_completion_handler(void) | |
6043 | { | |
6044 | struct cmd_completion_handler *handler = current_completion_handler; | |
6045 | ||
6046 | current_completion_handler = NULL; | |
6047 | return handler; | |
6048 | } | |
6049 | ||
2f77fc4b DG |
6050 | /* |
6051 | * Init command subsystem. | |
6052 | */ | |
6053 | void cmd_init(void) | |
6054 | { | |
6055 | /* | |
d88aee68 DG |
6056 | * Set network sequence index to 1 for streams to match a relayd |
6057 | * socket on the consumer side. | |
2f77fc4b | 6058 | */ |
d88aee68 DG |
6059 | pthread_mutex_lock(&relayd_net_seq_idx_lock); |
6060 | relayd_net_seq_idx = 1; | |
6061 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
6062 | |
6063 | DBG("Command subsystem initialized"); | |
6064 | } |