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 | ||
159b042f JG |
9 | #include "bin/lttng-sessiond/tracker.h" |
10 | #include "lttng/lttng-error.h" | |
11 | #include "lttng/tracker.h" | |
6c1c0768 | 12 | #define _LGPL_SOURCE |
2f77fc4b | 13 | #include <assert.h> |
6dc3064a | 14 | #include <inttypes.h> |
2f77fc4b DG |
15 | #include <urcu/list.h> |
16 | #include <urcu/uatomic.h> | |
a503e1ef | 17 | #include <sys/stat.h> |
d2956687 | 18 | #include <stdio.h> |
2f77fc4b DG |
19 | |
20 | #include <common/defaults.h> | |
21 | #include <common/common.h> | |
22 | #include <common/sessiond-comm/sessiond-comm.h> | |
23 | #include <common/relayd/relayd.h> | |
10a50311 | 24 | #include <common/utils.h> |
f5436bfc | 25 | #include <common/compat/string.h> |
93ec662e | 26 | #include <common/kernel-ctl/kernel-ctl.h> |
b0880ae5 JG |
27 | #include <common/dynamic-buffer.h> |
28 | #include <common/buffer-view.h> | |
9e620ea7 JG |
29 | #include <common/payload.h> |
30 | #include <common/payload-view.h> | |
82b69413 | 31 | #include <common/trace-chunk.h> |
3e3665b8 | 32 | #include <lttng/location-internal.h> |
b0880ae5 JG |
33 | #include <lttng/trigger/trigger-internal.h> |
34 | #include <lttng/condition/condition.h> | |
35 | #include <lttng/action/action.h> | |
6e21424e | 36 | #include <lttng/channel.h> |
b0880ae5 | 37 | #include <lttng/channel-internal.h> |
5c408ad8 | 38 | #include <lttng/rotate-internal.h> |
17dd1232 | 39 | #include <lttng/location-internal.h> |
b178f53e | 40 | #include <lttng/session-internal.h> |
3c02e545 | 41 | #include <lttng/userspace-probe-internal.h> |
b178f53e | 42 | #include <lttng/session-descriptor-internal.h> |
9f449915 | 43 | #include <common/string-utils/string-utils.h> |
2f77fc4b DG |
44 | |
45 | #include "channel.h" | |
46 | #include "consumer.h" | |
47 | #include "event.h" | |
8782cc74 | 48 | #include "health-sessiond.h" |
2f77fc4b DG |
49 | #include "kernel.h" |
50 | #include "kernel-consumer.h" | |
51 | #include "lttng-sessiond.h" | |
52 | #include "utils.h" | |
0dbc2034 | 53 | #include "lttng-syscall.h" |
7c1d2758 | 54 | #include "agent.h" |
93ec662e | 55 | #include "buffer-registry.h" |
b0880ae5 JG |
56 | #include "notification-thread.h" |
57 | #include "notification-thread-commands.h" | |
5c408ad8 JD |
58 | #include "rotate.h" |
59 | #include "rotation-thread.h" | |
8e319828 | 60 | #include "timer.h" |
f28f9e44 | 61 | #include "agent-thread.h" |
2f77fc4b DG |
62 | |
63 | #include "cmd.h" | |
64 | ||
a503e1ef JG |
65 | /* Sleep for 100ms between each check for the shm path's deletion. */ |
66 | #define SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US 100000 | |
67 | ||
3e3665b8 JG |
68 | struct cmd_destroy_session_reply_context { |
69 | int reply_sock_fd; | |
70 | bool implicit_rotation_on_destroy; | |
3285a971 JG |
71 | /* |
72 | * Indicates whether or not an error occurred while launching the | |
73 | * destruction of a session. | |
74 | */ | |
75 | enum lttng_error_code destruction_status; | |
3e3665b8 JG |
76 | }; |
77 | ||
a503e1ef JG |
78 | static enum lttng_error_code wait_on_path(void *path); |
79 | ||
80 | /* | |
81 | * Command completion handler that is used by the destroy command | |
82 | * when a session that has a non-default shm_path is being destroyed. | |
83 | * | |
84 | * See comment in cmd_destroy_session() for the rationale. | |
85 | */ | |
86 | static struct destroy_completion_handler { | |
87 | struct cmd_completion_handler handler; | |
88 | char shm_path[member_sizeof(struct ltt_session, shm_path)]; | |
89 | } destroy_completion_handler = { | |
90 | .handler = { | |
91 | .run = wait_on_path, | |
92 | .data = destroy_completion_handler.shm_path | |
93 | }, | |
94 | .shm_path = { 0 }, | |
95 | }; | |
96 | ||
97 | static struct cmd_completion_handler *current_completion_handler; | |
98 | ||
2f77fc4b DG |
99 | /* |
100 | * Used to keep a unique index for each relayd socket created where this value | |
101 | * is associated with streams on the consumer so it can match the right relayd | |
d88aee68 DG |
102 | * to send to. It must be accessed with the relayd_net_seq_idx_lock |
103 | * held. | |
2f77fc4b | 104 | */ |
d88aee68 DG |
105 | static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER; |
106 | static uint64_t relayd_net_seq_idx; | |
2f77fc4b | 107 | |
7076b56e JG |
108 | static int validate_ust_event_name(const char *); |
109 | static int cmd_enable_event_internal(struct ltt_session *session, | |
df4f5a87 | 110 | const struct lttng_domain *domain, |
7076b56e JG |
111 | char *channel_name, struct lttng_event *event, |
112 | char *filter_expression, | |
113 | struct lttng_filter_bytecode *filter, | |
114 | struct lttng_event_exclusion *exclusion, | |
115 | int wpipe); | |
116 | ||
2f77fc4b DG |
117 | /* |
118 | * Create a session path used by list_lttng_sessions for the case that the | |
119 | * session consumer is on the network. | |
120 | */ | |
121 | static int build_network_session_path(char *dst, size_t size, | |
122 | struct ltt_session *session) | |
123 | { | |
124 | int ret, kdata_port, udata_port; | |
125 | struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL; | |
126 | char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX]; | |
127 | ||
128 | assert(session); | |
129 | assert(dst); | |
130 | ||
131 | memset(tmp_urls, 0, sizeof(tmp_urls)); | |
132 | memset(tmp_uurl, 0, sizeof(tmp_uurl)); | |
133 | ||
134 | kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT; | |
135 | ||
136 | if (session->kernel_session && session->kernel_session->consumer) { | |
137 | kuri = &session->kernel_session->consumer->dst.net.control; | |
138 | kdata_port = session->kernel_session->consumer->dst.net.data.port; | |
139 | } | |
140 | ||
141 | if (session->ust_session && session->ust_session->consumer) { | |
142 | uuri = &session->ust_session->consumer->dst.net.control; | |
143 | udata_port = session->ust_session->consumer->dst.net.data.port; | |
144 | } | |
145 | ||
146 | if (uuri == NULL && kuri == NULL) { | |
147 | uri = &session->consumer->dst.net.control; | |
148 | kdata_port = session->consumer->dst.net.data.port; | |
149 | } else if (kuri && uuri) { | |
150 | ret = uri_compare(kuri, uuri); | |
151 | if (ret) { | |
152 | /* Not Equal */ | |
153 | uri = kuri; | |
154 | /* Build uuri URL string */ | |
155 | ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl)); | |
156 | if (ret < 0) { | |
157 | goto error; | |
158 | } | |
159 | } else { | |
160 | uri = kuri; | |
161 | } | |
162 | } else if (kuri && uuri == NULL) { | |
163 | uri = kuri; | |
164 | } else if (uuri && kuri == NULL) { | |
165 | uri = uuri; | |
166 | } | |
167 | ||
168 | ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls)); | |
169 | if (ret < 0) { | |
170 | goto error; | |
171 | } | |
172 | ||
9aa9f900 DG |
173 | /* |
174 | * Do we have a UST url set. If yes, this means we have both kernel and UST | |
175 | * to print. | |
176 | */ | |
9d035200 | 177 | if (*tmp_uurl != '\0') { |
2f77fc4b DG |
178 | ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]", |
179 | tmp_urls, kdata_port, tmp_uurl, udata_port); | |
180 | } else { | |
9aa9f900 | 181 | int dport; |
bef08707 | 182 | if (kuri || (!kuri && !uuri)) { |
9aa9f900 DG |
183 | dport = kdata_port; |
184 | } else { | |
185 | /* No kernel URI, use the UST port. */ | |
186 | dport = udata_port; | |
187 | } | |
188 | ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport); | |
2f77fc4b DG |
189 | } |
190 | ||
191 | error: | |
192 | return ret; | |
193 | } | |
194 | ||
fb83fe64 JD |
195 | /* |
196 | * Get run-time attributes if the session has been started (discarded events, | |
197 | * lost packets). | |
198 | */ | |
199 | static int get_kernel_runtime_stats(struct ltt_session *session, | |
200 | struct ltt_kernel_channel *kchan, uint64_t *discarded_events, | |
201 | uint64_t *lost_packets) | |
202 | { | |
203 | int ret; | |
204 | ||
205 | if (!session->has_been_started) { | |
206 | ret = 0; | |
207 | *discarded_events = 0; | |
208 | *lost_packets = 0; | |
209 | goto end; | |
210 | } | |
211 | ||
e1f3997a | 212 | ret = consumer_get_discarded_events(session->id, kchan->key, |
fb83fe64 JD |
213 | session->kernel_session->consumer, |
214 | discarded_events); | |
215 | if (ret < 0) { | |
216 | goto end; | |
217 | } | |
218 | ||
e1f3997a | 219 | ret = consumer_get_lost_packets(session->id, kchan->key, |
fb83fe64 JD |
220 | session->kernel_session->consumer, |
221 | lost_packets); | |
222 | if (ret < 0) { | |
223 | goto end; | |
224 | } | |
225 | ||
226 | end: | |
227 | return ret; | |
228 | } | |
229 | ||
230 | /* | |
231 | * Get run-time attributes if the session has been started (discarded events, | |
232 | * lost packets). | |
233 | */ | |
234 | static int get_ust_runtime_stats(struct ltt_session *session, | |
235 | struct ltt_ust_channel *uchan, uint64_t *discarded_events, | |
236 | uint64_t *lost_packets) | |
237 | { | |
238 | int ret; | |
239 | struct ltt_ust_session *usess; | |
240 | ||
a91c5803 JG |
241 | if (!discarded_events || !lost_packets) { |
242 | ret = -1; | |
243 | goto end; | |
244 | } | |
245 | ||
fb83fe64 | 246 | usess = session->ust_session; |
a905c624 JG |
247 | assert(discarded_events); |
248 | assert(lost_packets); | |
fb83fe64 JD |
249 | |
250 | if (!usess || !session->has_been_started) { | |
251 | *discarded_events = 0; | |
252 | *lost_packets = 0; | |
253 | ret = 0; | |
254 | goto end; | |
255 | } | |
256 | ||
257 | if (usess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
258 | ret = ust_app_uid_get_channel_runtime_stats(usess->id, | |
259 | &usess->buffer_reg_uid_list, | |
260 | usess->consumer, uchan->id, | |
261 | uchan->attr.overwrite, | |
262 | discarded_events, | |
263 | lost_packets); | |
264 | } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
265 | ret = ust_app_pid_get_channel_runtime_stats(usess, | |
266 | uchan, usess->consumer, | |
267 | uchan->attr.overwrite, | |
268 | discarded_events, | |
269 | lost_packets); | |
270 | if (ret < 0) { | |
271 | goto end; | |
272 | } | |
273 | *discarded_events += uchan->per_pid_closed_app_discarded; | |
274 | *lost_packets += uchan->per_pid_closed_app_lost; | |
275 | } else { | |
276 | ERR("Unsupported buffer type"); | |
967bc289 | 277 | assert(0); |
fb83fe64 JD |
278 | ret = -1; |
279 | goto end; | |
280 | } | |
281 | ||
282 | end: | |
283 | return ret; | |
284 | } | |
285 | ||
2f77fc4b DG |
286 | /* |
287 | * Fill lttng_channel array of all channels. | |
288 | */ | |
d449df4a | 289 | static ssize_t list_lttng_channels(enum lttng_domain_type domain, |
fb83fe64 | 290 | struct ltt_session *session, struct lttng_channel *channels, |
cf0bcb51 | 291 | struct lttng_channel_extended *chan_exts) |
2f77fc4b | 292 | { |
d449df4a | 293 | int i = 0, ret = 0; |
2f77fc4b DG |
294 | struct ltt_kernel_channel *kchan; |
295 | ||
296 | DBG("Listing channels for session %s", session->name); | |
297 | ||
298 | switch (domain) { | |
299 | case LTTNG_DOMAIN_KERNEL: | |
300 | /* Kernel channels */ | |
301 | if (session->kernel_session != NULL) { | |
302 | cds_list_for_each_entry(kchan, | |
303 | &session->kernel_session->channel_list.head, list) { | |
fb83fe64 | 304 | uint64_t discarded_events, lost_packets; |
cf0bcb51 JG |
305 | struct lttng_channel_extended *extended; |
306 | ||
307 | extended = (struct lttng_channel_extended *) | |
308 | kchan->channel->attr.extended.ptr; | |
fb83fe64 JD |
309 | |
310 | ret = get_kernel_runtime_stats(session, kchan, | |
311 | &discarded_events, &lost_packets); | |
312 | if (ret < 0) { | |
313 | goto end; | |
314 | } | |
2f77fc4b DG |
315 | /* Copy lttng_channel struct to array */ |
316 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
317 | channels[i].enabled = kchan->enabled; | |
fb83fe64 JD |
318 | chan_exts[i].discarded_events = |
319 | discarded_events; | |
320 | chan_exts[i].lost_packets = lost_packets; | |
cf0bcb51 JG |
321 | chan_exts[i].monitor_timer_interval = |
322 | extended->monitor_timer_interval; | |
491d1539 | 323 | chan_exts[i].blocking_timeout = 0; |
2f77fc4b DG |
324 | i++; |
325 | } | |
326 | } | |
327 | break; | |
328 | case LTTNG_DOMAIN_UST: | |
329 | { | |
330 | struct lttng_ht_iter iter; | |
331 | struct ltt_ust_channel *uchan; | |
332 | ||
e7fe706f | 333 | rcu_read_lock(); |
2f77fc4b DG |
334 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
335 | &iter.iter, uchan, node.node) { | |
a91c5803 | 336 | uint64_t discarded_events = 0, lost_packets = 0; |
fb83fe64 | 337 | |
8ee609c8 MD |
338 | if (lttng_strncpy(channels[i].name, uchan->name, |
339 | LTTNG_SYMBOL_NAME_LEN)) { | |
340 | break; | |
341 | } | |
2f77fc4b DG |
342 | channels[i].attr.overwrite = uchan->attr.overwrite; |
343 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
344 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
345 | channels[i].attr.switch_timer_interval = | |
346 | uchan->attr.switch_timer_interval; | |
347 | channels[i].attr.read_timer_interval = | |
348 | uchan->attr.read_timer_interval; | |
349 | channels[i].enabled = uchan->enabled; | |
2f785fe7 DG |
350 | channels[i].attr.tracefile_size = uchan->tracefile_size; |
351 | channels[i].attr.tracefile_count = uchan->tracefile_count; | |
5e4435a4 JG |
352 | |
353 | /* | |
354 | * Map enum lttng_ust_output to enum lttng_event_output. | |
355 | */ | |
2f77fc4b DG |
356 | switch (uchan->attr.output) { |
357 | case LTTNG_UST_MMAP: | |
2f77fc4b DG |
358 | channels[i].attr.output = LTTNG_EVENT_MMAP; |
359 | break; | |
5e4435a4 JG |
360 | default: |
361 | /* | |
362 | * LTTNG_UST_MMAP is the only supported UST | |
363 | * output mode. | |
364 | */ | |
365 | assert(0); | |
366 | break; | |
2f77fc4b | 367 | } |
fb83fe64 | 368 | |
d449df4a MD |
369 | chan_exts[i].monitor_timer_interval = |
370 | uchan->monitor_timer_interval; | |
491d1539 MD |
371 | chan_exts[i].blocking_timeout = |
372 | uchan->attr.u.s.blocking_timeout; | |
d449df4a | 373 | |
fb83fe64 JD |
374 | ret = get_ust_runtime_stats(session, uchan, |
375 | &discarded_events, &lost_packets); | |
376 | if (ret < 0) { | |
377 | break; | |
378 | } | |
379 | chan_exts[i].discarded_events = discarded_events; | |
380 | chan_exts[i].lost_packets = lost_packets; | |
2f77fc4b DG |
381 | i++; |
382 | } | |
e7fe706f | 383 | rcu_read_unlock(); |
2f77fc4b DG |
384 | break; |
385 | } | |
386 | default: | |
387 | break; | |
388 | } | |
fb83fe64 JD |
389 | |
390 | end: | |
d449df4a MD |
391 | if (ret < 0) { |
392 | return -LTTNG_ERR_FATAL; | |
393 | } else { | |
394 | return LTTNG_OK; | |
395 | } | |
2f77fc4b DG |
396 | } |
397 | ||
3c02e545 FD |
398 | static int append_extended_info(const char *filter_expression, |
399 | struct lttng_event_exclusion *exclusion, | |
400 | struct lttng_userspace_probe_location *probe_location, | |
e368fb43 | 401 | struct lttng_payload *payload) |
b4e3ceb9 | 402 | { |
3c02e545 | 403 | int ret = 0; |
b4e3ceb9 | 404 | size_t filter_len = 0; |
795d57ce | 405 | size_t nb_exclusions = 0; |
3c02e545 | 406 | size_t userspace_probe_location_len = 0; |
e368fb43 JG |
407 | struct lttcomm_event_extended_header extended_header = {}; |
408 | struct lttcomm_event_extended_header *p_extended_header; | |
409 | const size_t original_payload_size = payload->buffer.size; | |
410 | ||
411 | ret = lttng_dynamic_buffer_append(&payload->buffer, &extended_header, | |
412 | sizeof(extended_header)); | |
413 | if (ret) { | |
414 | goto end; | |
415 | } | |
b4e3ceb9 PP |
416 | |
417 | if (filter_expression) { | |
418 | filter_len = strlen(filter_expression) + 1; | |
e368fb43 JG |
419 | ret = lttng_dynamic_buffer_append(&payload->buffer, |
420 | filter_expression, filter_len); | |
421 | if (ret) { | |
422 | goto end; | |
423 | } | |
b4e3ceb9 PP |
424 | } |
425 | ||
795d57ce | 426 | if (exclusion) { |
e368fb43 JG |
427 | const size_t len = exclusion->count * LTTNG_SYMBOL_NAME_LEN; |
428 | ||
795d57ce | 429 | nb_exclusions = exclusion->count; |
e368fb43 JG |
430 | |
431 | ret = lttng_dynamic_buffer_append( | |
432 | &payload->buffer, &exclusion->names, len); | |
433 | if (ret) { | |
434 | goto end; | |
435 | } | |
795d57ce PP |
436 | } |
437 | ||
3c02e545 | 438 | if (probe_location) { |
e368fb43 JG |
439 | const size_t size_before_probe = payload->buffer.size; |
440 | ||
3c02e545 | 441 | ret = lttng_userspace_probe_location_serialize(probe_location, |
e368fb43 | 442 | payload); |
3c02e545 FD |
443 | if (ret < 0) { |
444 | ret = -1; | |
445 | goto end; | |
446 | } | |
795d57ce | 447 | |
e368fb43 JG |
448 | userspace_probe_location_len = |
449 | payload->buffer.size - size_before_probe; | |
795d57ce PP |
450 | } |
451 | ||
e368fb43 JG |
452 | /* Set header fields */ |
453 | p_extended_header = (struct lttcomm_event_extended_header *) | |
454 | (payload->buffer.data + original_payload_size); | |
795d57ce | 455 | |
e368fb43 JG |
456 | p_extended_header->filter_len = filter_len; |
457 | p_extended_header->nb_exclusions = nb_exclusions; | |
458 | p_extended_header->userspace_probe_location_len = | |
459 | userspace_probe_location_len; | |
3c02e545 | 460 | |
3c02e545 FD |
461 | ret = 0; |
462 | end: | |
463 | return ret; | |
b4e3ceb9 PP |
464 | } |
465 | ||
3c6a091f | 466 | /* |
022d91ba | 467 | * Create a list of agent domain events. |
3c6a091f DG |
468 | * |
469 | * Return number of events in list on success or else a negative value. | |
470 | */ | |
022d91ba | 471 | static int list_lttng_agent_events(struct agent *agt, |
e368fb43 | 472 | struct lttng_payload *payload) |
3c6a091f | 473 | { |
e368fb43 JG |
474 | int nb_events = 0, ret = 0; |
475 | const struct agent_event *agent_event; | |
3c6a091f DG |
476 | struct lttng_ht_iter iter; |
477 | ||
022d91ba | 478 | assert(agt); |
3c6a091f | 479 | |
022d91ba | 480 | DBG3("Listing agent events"); |
3c6a091f | 481 | |
e5bbf678 | 482 | rcu_read_lock(); |
e368fb43 JG |
483 | cds_lfht_for_each_entry ( |
484 | agt->events->ht, &iter.iter, agent_event, node.node) { | |
485 | struct lttng_event event = { | |
486 | .enabled = agent_event->enabled, | |
487 | .loglevel = agent_event->loglevel_value, | |
488 | .loglevel_type = agent_event->loglevel_type, | |
489 | }; | |
490 | ||
491 | strncpy(event.name, agent_event->name, sizeof(event.name)); | |
492 | event.name[sizeof(event.name) - 1] = '\0'; | |
493 | ||
494 | ret = lttng_dynamic_buffer_append( | |
495 | &payload->buffer, &event, sizeof(event)); | |
3c02e545 | 496 | if (ret) { |
e368fb43 JG |
497 | ERR("Failed to append event to payload"); |
498 | ret = -LTTNG_ERR_NOMEM; | |
499 | goto end; | |
3c02e545 | 500 | } |
b4e3ceb9 | 501 | |
e368fb43 | 502 | nb_events++; |
3c6a091f DG |
503 | } |
504 | ||
e368fb43 JG |
505 | cds_lfht_for_each_entry ( |
506 | agt->events->ht, &iter.iter, agent_event, node.node) { | |
507 | /* Append extended info. */ | |
508 | ret = append_extended_info(agent_event->filter_expression, NULL, | |
509 | NULL, payload); | |
3c02e545 | 510 | if (ret) { |
e368fb43 JG |
511 | ERR("Failed to append extended event info to payload"); |
512 | ret = -LTTNG_ERR_NOMEM; | |
513 | goto end; | |
3c02e545 | 514 | } |
3c6a091f | 515 | } |
3c6a091f | 516 | |
e368fb43 | 517 | ret = nb_events; |
47e52862 | 518 | end: |
3c02e545 | 519 | rcu_read_unlock(); |
3c6a091f DG |
520 | return ret; |
521 | } | |
522 | ||
2f77fc4b DG |
523 | /* |
524 | * Create a list of ust global domain events. | |
525 | */ | |
526 | static int list_lttng_ust_global_events(char *channel_name, | |
b4e3ceb9 | 527 | struct ltt_ust_domain_global *ust_global, |
e368fb43 | 528 | struct lttng_payload *payload) |
2f77fc4b | 529 | { |
e368fb43 JG |
530 | int ret = 0; |
531 | unsigned int nb_events = 0; | |
2f77fc4b | 532 | struct lttng_ht_iter iter; |
e368fb43 JG |
533 | const struct lttng_ht_node_str *node; |
534 | const struct ltt_ust_channel *uchan; | |
535 | const struct ltt_ust_event *uevent; | |
2f77fc4b DG |
536 | |
537 | DBG("Listing UST global events for channel %s", channel_name); | |
538 | ||
539 | rcu_read_lock(); | |
540 | ||
e368fb43 | 541 | lttng_ht_lookup(ust_global->channels, (void *) channel_name, &iter); |
2f77fc4b DG |
542 | node = lttng_ht_iter_get_node_str(&iter); |
543 | if (node == NULL) { | |
f73fabfd | 544 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
d31d3e8c | 545 | goto end; |
2f77fc4b DG |
546 | } |
547 | ||
548 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); | |
549 | ||
e368fb43 | 550 | DBG3("Listing UST global events"); |
2f77fc4b | 551 | |
b4e3ceb9 | 552 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
e368fb43 JG |
553 | struct lttng_event event = {}; |
554 | ||
b4e3ceb9 | 555 | if (uevent->internal) { |
b4e3ceb9 PP |
556 | continue; |
557 | } | |
558 | ||
e368fb43 JG |
559 | strncpy(event.name, uevent->attr.name, sizeof(event.name)); |
560 | event.name[sizeof(event.name) - 1] = '\0'; | |
2f77fc4b | 561 | |
e368fb43 | 562 | event.enabled = uevent->enabled; |
2f77fc4b DG |
563 | |
564 | switch (uevent->attr.instrumentation) { | |
565 | case LTTNG_UST_TRACEPOINT: | |
e368fb43 | 566 | event.type = LTTNG_EVENT_TRACEPOINT; |
2f77fc4b DG |
567 | break; |
568 | case LTTNG_UST_PROBE: | |
e368fb43 | 569 | event.type = LTTNG_EVENT_PROBE; |
2f77fc4b DG |
570 | break; |
571 | case LTTNG_UST_FUNCTION: | |
e368fb43 | 572 | event.type = LTTNG_EVENT_FUNCTION; |
2f77fc4b DG |
573 | break; |
574 | } | |
575 | ||
e368fb43 | 576 | event.loglevel = uevent->attr.loglevel; |
2f77fc4b DG |
577 | switch (uevent->attr.loglevel_type) { |
578 | case LTTNG_UST_LOGLEVEL_ALL: | |
e368fb43 | 579 | event.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; |
2f77fc4b DG |
580 | break; |
581 | case LTTNG_UST_LOGLEVEL_RANGE: | |
e368fb43 | 582 | event.loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; |
2f77fc4b DG |
583 | break; |
584 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
e368fb43 | 585 | event.loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; |
2f77fc4b DG |
586 | break; |
587 | } | |
e368fb43 | 588 | |
2f77fc4b | 589 | if (uevent->filter) { |
e368fb43 | 590 | event.filter = 1; |
2f77fc4b | 591 | } |
e368fb43 | 592 | |
4634f12e | 593 | if (uevent->exclusion) { |
e368fb43 JG |
594 | event.exclusion = 1; |
595 | } | |
596 | ||
597 | ret = lttng_dynamic_buffer_append(&payload->buffer, &event, sizeof(event)); | |
598 | if (ret) { | |
599 | ERR("Failed to append event to payload"); | |
600 | ret = -LTTNG_ERR_NOMEM; | |
601 | goto end; | |
4634f12e | 602 | } |
b4e3ceb9 | 603 | |
e368fb43 JG |
604 | nb_events++; |
605 | } | |
606 | ||
607 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { | |
608 | /* Append extended info. */ | |
3c02e545 | 609 | ret = append_extended_info(uevent->filter_expression, |
e368fb43 | 610 | uevent->exclusion, NULL, payload); |
3c02e545 | 611 | if (ret) { |
e368fb43 | 612 | ERR("Failed to append extended event info to payload"); |
3c02e545 FD |
613 | ret = -LTTNG_ERR_FATAL; |
614 | goto end; | |
615 | } | |
2f77fc4b DG |
616 | } |
617 | ||
e368fb43 | 618 | ret = nb_events; |
d31d3e8c | 619 | end: |
2f77fc4b DG |
620 | rcu_read_unlock(); |
621 | return ret; | |
622 | } | |
623 | ||
624 | /* | |
625 | * Fill lttng_event array of all kernel events in the channel. | |
626 | */ | |
627 | static int list_lttng_kernel_events(char *channel_name, | |
b4e3ceb9 | 628 | struct ltt_kernel_session *kernel_session, |
e368fb43 | 629 | struct lttng_payload *payload) |
2f77fc4b | 630 | { |
e368fb43 | 631 | int ret; |
2f77fc4b | 632 | unsigned int nb_event; |
e368fb43 JG |
633 | const struct ltt_kernel_event *kevent; |
634 | const struct ltt_kernel_channel *kchan; | |
2f77fc4b DG |
635 | |
636 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
637 | if (kchan == NULL) { | |
f73fabfd | 638 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
639 | goto error; |
640 | } | |
641 | ||
642 | nb_event = kchan->event_count; | |
643 | ||
644 | DBG("Listing events for channel %s", kchan->channel->name); | |
645 | ||
e368fb43 JG |
646 | /* Kernel channels */ |
647 | cds_list_for_each_entry(kevent, &kchan->events_list.head , list) { | |
648 | struct lttng_event event = {}; | |
2f77fc4b | 649 | |
e368fb43 JG |
650 | strncpy(event.name, kevent->event->name, sizeof(event.name)); |
651 | event.name[sizeof(event.name) - 1] = '\0'; | |
652 | event.enabled = kevent->enabled; | |
653 | event.filter = (unsigned char) !!kevent->filter_expression; | |
b4e3ceb9 | 654 | |
e368fb43 | 655 | switch (kevent->event->instrumentation) { |
2f77fc4b | 656 | case LTTNG_KERNEL_TRACEPOINT: |
e368fb43 | 657 | event.type = LTTNG_EVENT_TRACEPOINT; |
2f77fc4b | 658 | break; |
2f77fc4b | 659 | case LTTNG_KERNEL_KRETPROBE: |
e368fb43 JG |
660 | event.type = LTTNG_EVENT_FUNCTION; |
661 | memcpy(&event.attr.probe, &kevent->event->u.kprobe, | |
1896972b DG |
662 | sizeof(struct lttng_kernel_kprobe)); |
663 | break; | |
664 | case LTTNG_KERNEL_KPROBE: | |
e368fb43 JG |
665 | event.type = LTTNG_EVENT_PROBE; |
666 | memcpy(&event.attr.probe, &kevent->event->u.kprobe, | |
2f77fc4b DG |
667 | sizeof(struct lttng_kernel_kprobe)); |
668 | break; | |
b955b4d4 | 669 | case LTTNG_KERNEL_UPROBE: |
e368fb43 | 670 | event.type = LTTNG_EVENT_USERSPACE_PROBE; |
b955b4d4 | 671 | break; |
2f77fc4b | 672 | case LTTNG_KERNEL_FUNCTION: |
e368fb43 JG |
673 | event.type = LTTNG_EVENT_FUNCTION; |
674 | memcpy(&event.attr.ftrace, &kevent->event->u.ftrace, | |
2f77fc4b DG |
675 | sizeof(struct lttng_kernel_function)); |
676 | break; | |
677 | case LTTNG_KERNEL_NOOP: | |
e368fb43 | 678 | event.type = LTTNG_EVENT_NOOP; |
2f77fc4b DG |
679 | break; |
680 | case LTTNG_KERNEL_SYSCALL: | |
e368fb43 | 681 | event.type = LTTNG_EVENT_SYSCALL; |
2f77fc4b DG |
682 | break; |
683 | case LTTNG_KERNEL_ALL: | |
1ab8c2ad FD |
684 | /* fall-through. */ |
685 | default: | |
2f77fc4b DG |
686 | assert(0); |
687 | break; | |
688 | } | |
b4e3ceb9 | 689 | |
e368fb43 JG |
690 | ret = lttng_dynamic_buffer_append( |
691 | &payload->buffer, &event, sizeof(event)); | |
692 | if (ret) { | |
693 | ERR("Failed to append event to payload"); | |
694 | ret = -LTTNG_ERR_NOMEM; | |
695 | goto end; | |
696 | } | |
697 | } | |
698 | ||
699 | cds_list_for_each_entry(kevent, &kchan->events_list.head , list) { | |
700 | /* Append extended info. */ | |
701 | ret = append_extended_info(kevent->filter_expression, NULL, | |
702 | kevent->userspace_probe_location, payload); | |
3c02e545 FD |
703 | if (ret) { |
704 | DBG("Error appending extended info message"); | |
705 | ret = -LTTNG_ERR_FATAL; | |
706 | goto error; | |
707 | } | |
2f77fc4b DG |
708 | } |
709 | ||
db906c12 | 710 | end: |
2f77fc4b | 711 | return nb_event; |
2f77fc4b | 712 | error: |
6314496f | 713 | return ret; |
2f77fc4b DG |
714 | } |
715 | ||
716 | /* | |
717 | * Add URI so the consumer output object. Set the correct path depending on the | |
718 | * domain adding the default trace directory. | |
719 | */ | |
b178f53e JG |
720 | static enum lttng_error_code add_uri_to_consumer( |
721 | const struct ltt_session *session, | |
722 | struct consumer_output *consumer, | |
723 | struct lttng_uri *uri, enum lttng_domain_type domain) | |
2f77fc4b | 724 | { |
b178f53e JG |
725 | int ret; |
726 | enum lttng_error_code ret_code = LTTNG_OK; | |
2f77fc4b DG |
727 | |
728 | assert(uri); | |
729 | ||
730 | if (consumer == NULL) { | |
731 | DBG("No consumer detected. Don't add URI. Stopping."); | |
b178f53e | 732 | ret_code = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
733 | goto error; |
734 | } | |
735 | ||
736 | switch (domain) { | |
737 | case LTTNG_DOMAIN_KERNEL: | |
b178f53e JG |
738 | ret = lttng_strncpy(consumer->domain_subdir, |
739 | DEFAULT_KERNEL_TRACE_DIR, | |
740 | sizeof(consumer->domain_subdir)); | |
2f77fc4b DG |
741 | break; |
742 | case LTTNG_DOMAIN_UST: | |
b178f53e JG |
743 | ret = lttng_strncpy(consumer->domain_subdir, |
744 | DEFAULT_UST_TRACE_DIR, | |
745 | sizeof(consumer->domain_subdir)); | |
2f77fc4b DG |
746 | break; |
747 | default: | |
748 | /* | |
b178f53e JG |
749 | * This case is possible is we try to add the URI to the global |
750 | * tracing session consumer object which in this case there is | |
751 | * no subdir. | |
2f77fc4b | 752 | */ |
b178f53e JG |
753 | memset(consumer->domain_subdir, 0, |
754 | sizeof(consumer->domain_subdir)); | |
755 | ret = 0; | |
756 | } | |
757 | if (ret) { | |
758 | ERR("Failed to initialize consumer output domain subdirectory"); | |
759 | ret_code = LTTNG_ERR_FATAL; | |
760 | goto error; | |
2f77fc4b DG |
761 | } |
762 | ||
763 | switch (uri->dtype) { | |
764 | case LTTNG_DST_IPV4: | |
765 | case LTTNG_DST_IPV6: | |
766 | DBG2("Setting network URI to consumer"); | |
767 | ||
df75acac DG |
768 | if (consumer->type == CONSUMER_DST_NET) { |
769 | if ((uri->stype == LTTNG_STREAM_CONTROL && | |
785d2d0d DG |
770 | consumer->dst.net.control_isset) || |
771 | (uri->stype == LTTNG_STREAM_DATA && | |
772 | consumer->dst.net.data_isset)) { | |
b178f53e | 773 | ret_code = LTTNG_ERR_URL_EXIST; |
df75acac DG |
774 | goto error; |
775 | } | |
776 | } else { | |
b178f53e | 777 | memset(&consumer->dst, 0, sizeof(consumer->dst)); |
785d2d0d DG |
778 | } |
779 | ||
2f77fc4b | 780 | /* Set URI into consumer output object */ |
b178f53e | 781 | ret = consumer_set_network_uri(session, consumer, uri); |
2f77fc4b | 782 | if (ret < 0) { |
b178f53e | 783 | ret_code = -ret; |
2f77fc4b DG |
784 | goto error; |
785 | } else if (ret == 1) { | |
786 | /* | |
787 | * URI was the same in the consumer so we do not append the subdir | |
788 | * again so to not duplicate output dir. | |
789 | */ | |
b178f53e | 790 | ret_code = LTTNG_OK; |
2f77fc4b DG |
791 | goto error; |
792 | } | |
2f77fc4b DG |
793 | break; |
794 | case LTTNG_DST_PATH: | |
b178f53e JG |
795 | if (*uri->dst.path != '/' || strstr(uri->dst.path, "../")) { |
796 | ret_code = LTTNG_ERR_INVALID; | |
9ac05d92 MD |
797 | goto error; |
798 | } | |
b178f53e JG |
799 | DBG2("Setting trace directory path from URI to %s", |
800 | uri->dst.path); | |
801 | memset(&consumer->dst, 0, sizeof(consumer->dst)); | |
802 | ||
803 | ret = lttng_strncpy(consumer->dst.session_root_path, | |
804 | uri->dst.path, | |
805 | sizeof(consumer->dst.session_root_path)); | |
4df41cad JG |
806 | if (ret) { |
807 | ret_code = LTTNG_ERR_FATAL; | |
808 | goto error; | |
809 | } | |
2f77fc4b DG |
810 | consumer->type = CONSUMER_DST_LOCAL; |
811 | break; | |
812 | } | |
813 | ||
b178f53e | 814 | ret_code = LTTNG_OK; |
2f77fc4b | 815 | error: |
b178f53e | 816 | return ret_code; |
2f77fc4b DG |
817 | } |
818 | ||
819 | /* | |
820 | * Init tracing by creating trace directory and sending fds kernel consumer. | |
821 | */ | |
822 | static int init_kernel_tracing(struct ltt_kernel_session *session) | |
823 | { | |
824 | int ret = 0; | |
825 | struct lttng_ht_iter iter; | |
826 | struct consumer_socket *socket; | |
827 | ||
828 | assert(session); | |
829 | ||
e7fe706f DG |
830 | rcu_read_lock(); |
831 | ||
2f77fc4b DG |
832 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { |
833 | cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter, | |
834 | socket, node.node) { | |
2f77fc4b | 835 | pthread_mutex_lock(socket->lock); |
f50f23d9 | 836 | ret = kernel_consumer_send_session(socket, session); |
2f77fc4b DG |
837 | pthread_mutex_unlock(socket->lock); |
838 | if (ret < 0) { | |
f73fabfd | 839 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
840 | goto error; |
841 | } | |
842 | } | |
843 | } | |
844 | ||
845 | error: | |
e7fe706f | 846 | rcu_read_unlock(); |
2f77fc4b DG |
847 | return ret; |
848 | } | |
849 | ||
850 | /* | |
851 | * Create a socket to the relayd using the URI. | |
852 | * | |
853 | * On success, the relayd_sock pointer is set to the created socket. | |
9a654598 | 854 | * Else, it remains untouched and an LTTng error code is returned. |
2f77fc4b | 855 | */ |
9a654598 | 856 | static enum lttng_error_code create_connect_relayd(struct lttng_uri *uri, |
b31610f2 JD |
857 | struct lttcomm_relayd_sock **relayd_sock, |
858 | struct consumer_output *consumer) | |
2f77fc4b DG |
859 | { |
860 | int ret; | |
9a654598 | 861 | enum lttng_error_code status = LTTNG_OK; |
6151a90f | 862 | struct lttcomm_relayd_sock *rsock; |
2f77fc4b | 863 | |
6151a90f JD |
864 | rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR, |
865 | RELAYD_VERSION_COMM_MINOR); | |
866 | if (!rsock) { | |
9a654598 | 867 | status = LTTNG_ERR_FATAL; |
2f77fc4b DG |
868 | goto error; |
869 | } | |
870 | ||
ffe60014 DG |
871 | /* |
872 | * Connect to relayd so we can proceed with a session creation. This call | |
873 | * can possibly block for an arbitrary amount of time to set the health | |
874 | * state to be in poll execution. | |
875 | */ | |
876 | health_poll_entry(); | |
6151a90f | 877 | ret = relayd_connect(rsock); |
ffe60014 | 878 | health_poll_exit(); |
2f77fc4b DG |
879 | if (ret < 0) { |
880 | ERR("Unable to reach lttng-relayd"); | |
9a654598 | 881 | status = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
882 | goto free_sock; |
883 | } | |
884 | ||
885 | /* Create socket for control stream. */ | |
886 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
eacb7b6f MD |
887 | uint64_t result_flags; |
888 | ||
2f77fc4b DG |
889 | DBG3("Creating relayd stream socket from URI"); |
890 | ||
891 | /* Check relayd version */ | |
6151a90f | 892 | ret = relayd_version_check(rsock); |
67d5aa28 | 893 | if (ret == LTTNG_ERR_RELAYD_VERSION_FAIL) { |
9a654598 | 894 | status = LTTNG_ERR_RELAYD_VERSION_FAIL; |
67d5aa28 JD |
895 | goto close_sock; |
896 | } else if (ret < 0) { | |
897 | ERR("Unable to reach lttng-relayd"); | |
9a654598 | 898 | status = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
899 | goto close_sock; |
900 | } | |
b31610f2 JD |
901 | consumer->relay_major_version = rsock->major; |
902 | consumer->relay_minor_version = rsock->minor; | |
eacb7b6f MD |
903 | ret = relayd_get_configuration(rsock, 0, |
904 | &result_flags); | |
905 | if (ret < 0) { | |
906 | ERR("Unable to get relayd configuration"); | |
907 | status = LTTNG_ERR_RELAYD_CONNECT_FAIL; | |
908 | goto close_sock; | |
909 | } | |
910 | if (result_flags & LTTCOMM_RELAYD_CONFIGURATION_FLAG_CLEAR_ALLOWED) { | |
911 | consumer->relay_allows_clear = true; | |
912 | } | |
2f77fc4b DG |
913 | } else if (uri->stype == LTTNG_STREAM_DATA) { |
914 | DBG3("Creating relayd data socket from URI"); | |
915 | } else { | |
916 | /* Command is not valid */ | |
917 | ERR("Relayd invalid stream type: %d", uri->stype); | |
9a654598 | 918 | status = LTTNG_ERR_INVALID; |
2f77fc4b DG |
919 | goto close_sock; |
920 | } | |
921 | ||
6151a90f | 922 | *relayd_sock = rsock; |
2f77fc4b | 923 | |
9a654598 | 924 | return status; |
2f77fc4b DG |
925 | |
926 | close_sock: | |
6151a90f JD |
927 | /* The returned value is not useful since we are on an error path. */ |
928 | (void) relayd_close(rsock); | |
2f77fc4b | 929 | free_sock: |
6151a90f | 930 | free(rsock); |
2f77fc4b | 931 | error: |
9a654598 | 932 | return status; |
2f77fc4b DG |
933 | } |
934 | ||
935 | /* | |
936 | * Connect to the relayd using URI and send the socket to the right consumer. | |
43fade62 JG |
937 | * |
938 | * The consumer socket lock must be held by the caller. | |
9a654598 JG |
939 | * |
940 | * Returns LTTNG_OK on success or an LTTng error code on failure. | |
2f77fc4b | 941 | */ |
9a654598 JG |
942 | static enum lttng_error_code send_consumer_relayd_socket( |
943 | unsigned int session_id, | |
3044f922 | 944 | struct lttng_uri *relayd_uri, |
56a37563 | 945 | struct consumer_output *consumer, |
d3e2ba59 | 946 | struct consumer_socket *consumer_sock, |
fb9a95c4 | 947 | const char *session_name, const char *hostname, |
6fa5fe7c | 948 | const char *base_path, int session_live_timer, |
db1da059 | 949 | const uint64_t *current_chunk_id, |
46ef2188 MD |
950 | time_t session_creation_time, |
951 | bool session_name_contains_creation_time) | |
2f77fc4b DG |
952 | { |
953 | int ret; | |
6151a90f | 954 | struct lttcomm_relayd_sock *rsock = NULL; |
9a654598 | 955 | enum lttng_error_code status; |
2f77fc4b | 956 | |
ffe60014 | 957 | /* Connect to relayd and make version check if uri is the control. */ |
9a654598 JG |
958 | status = create_connect_relayd(relayd_uri, &rsock, consumer); |
959 | if (status != LTTNG_OK) { | |
9e218353 | 960 | goto relayd_comm_error; |
ffe60014 | 961 | } |
6151a90f | 962 | assert(rsock); |
ffe60014 | 963 | |
2f77fc4b | 964 | /* Set the network sequence index if not set. */ |
d88aee68 DG |
965 | if (consumer->net_seq_index == (uint64_t) -1ULL) { |
966 | pthread_mutex_lock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
967 | /* |
968 | * Increment net_seq_idx because we are about to transfer the | |
969 | * new relayd socket to the consumer. | |
d88aee68 | 970 | * Assign unique key so the consumer can match streams. |
2f77fc4b | 971 | */ |
d88aee68 DG |
972 | consumer->net_seq_index = ++relayd_net_seq_idx; |
973 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
974 | } |
975 | ||
2f77fc4b | 976 | /* Send relayd socket to consumer. */ |
6151a90f | 977 | ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer, |
d3e2ba59 | 978 | relayd_uri->stype, session_id, |
6fa5fe7c MD |
979 | session_name, hostname, base_path, |
980 | session_live_timer, current_chunk_id, | |
46ef2188 | 981 | session_creation_time, session_name_contains_creation_time); |
2f77fc4b | 982 | if (ret < 0) { |
9a654598 | 983 | status = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
984 | goto close_sock; |
985 | } | |
986 | ||
c890b720 DG |
987 | /* Flag that the corresponding socket was sent. */ |
988 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
ffe60014 | 989 | consumer_sock->control_sock_sent = 1; |
c890b720 | 990 | } else if (relayd_uri->stype == LTTNG_STREAM_DATA) { |
ffe60014 | 991 | consumer_sock->data_sock_sent = 1; |
c890b720 DG |
992 | } |
993 | ||
2f77fc4b DG |
994 | /* |
995 | * Close socket which was dup on the consumer side. The session daemon does | |
996 | * NOT keep track of the relayd socket(s) once transfer to the consumer. | |
997 | */ | |
998 | ||
999 | close_sock: | |
9a654598 | 1000 | if (status != LTTNG_OK) { |
ffe60014 | 1001 | /* |
d9078d0c DG |
1002 | * The consumer output for this session should not be used anymore |
1003 | * since the relayd connection failed thus making any tracing or/and | |
1004 | * streaming not usable. | |
ffe60014 | 1005 | */ |
d9078d0c | 1006 | consumer->enabled = 0; |
ffe60014 | 1007 | } |
9e218353 JR |
1008 | (void) relayd_close(rsock); |
1009 | free(rsock); | |
1010 | ||
1011 | relayd_comm_error: | |
9a654598 | 1012 | return status; |
2f77fc4b DG |
1013 | } |
1014 | ||
1015 | /* | |
1016 | * Send both relayd sockets to a specific consumer and domain. This is a | |
1017 | * helper function to facilitate sending the information to the consumer for a | |
1018 | * session. | |
43fade62 JG |
1019 | * |
1020 | * The consumer socket lock must be held by the caller. | |
9a654598 JG |
1021 | * |
1022 | * Returns LTTNG_OK, or an LTTng error code on failure. | |
2f77fc4b | 1023 | */ |
9a654598 JG |
1024 | static enum lttng_error_code send_consumer_relayd_sockets( |
1025 | enum lttng_domain_type domain, | |
56a37563 | 1026 | unsigned int session_id, struct consumer_output *consumer, |
fb9a95c4 | 1027 | struct consumer_socket *sock, const char *session_name, |
6fa5fe7c | 1028 | const char *hostname, const char *base_path, int session_live_timer, |
46ef2188 MD |
1029 | const uint64_t *current_chunk_id, time_t session_creation_time, |
1030 | bool session_name_contains_creation_time) | |
2f77fc4b | 1031 | { |
9a654598 | 1032 | enum lttng_error_code status = LTTNG_OK; |
2f77fc4b | 1033 | |
2f77fc4b | 1034 | assert(consumer); |
6dc3064a | 1035 | assert(sock); |
2f77fc4b | 1036 | |
2f77fc4b | 1037 | /* Sending control relayd socket. */ |
ffe60014 | 1038 | if (!sock->control_sock_sent) { |
9a654598 | 1039 | status = send_consumer_relayd_socket(session_id, |
d3e2ba59 | 1040 | &consumer->dst.net.control, consumer, sock, |
6fa5fe7c | 1041 | session_name, hostname, base_path, session_live_timer, |
46ef2188 MD |
1042 | current_chunk_id, session_creation_time, |
1043 | session_name_contains_creation_time); | |
9a654598 | 1044 | if (status != LTTNG_OK) { |
c890b720 DG |
1045 | goto error; |
1046 | } | |
2f77fc4b DG |
1047 | } |
1048 | ||
1049 | /* Sending data relayd socket. */ | |
ffe60014 | 1050 | if (!sock->data_sock_sent) { |
9a654598 | 1051 | status = send_consumer_relayd_socket(session_id, |
d3e2ba59 | 1052 | &consumer->dst.net.data, consumer, sock, |
6fa5fe7c | 1053 | session_name, hostname, base_path, session_live_timer, |
46ef2188 MD |
1054 | current_chunk_id, session_creation_time, |
1055 | session_name_contains_creation_time); | |
9a654598 | 1056 | if (status != LTTNG_OK) { |
c890b720 DG |
1057 | goto error; |
1058 | } | |
2f77fc4b DG |
1059 | } |
1060 | ||
2f77fc4b | 1061 | error: |
9a654598 | 1062 | return status; |
2f77fc4b DG |
1063 | } |
1064 | ||
1065 | /* | |
1066 | * Setup relayd connections for a tracing session. First creates the socket to | |
1067 | * the relayd and send them to the right domain consumer. Consumer type MUST be | |
1068 | * network. | |
1069 | */ | |
ffe60014 | 1070 | int cmd_setup_relayd(struct ltt_session *session) |
2f77fc4b | 1071 | { |
f73fabfd | 1072 | int ret = LTTNG_OK; |
2f77fc4b DG |
1073 | struct ltt_ust_session *usess; |
1074 | struct ltt_kernel_session *ksess; | |
1075 | struct consumer_socket *socket; | |
1076 | struct lttng_ht_iter iter; | |
1e791a74 | 1077 | LTTNG_OPTIONAL(uint64_t) current_chunk_id = {}; |
2f77fc4b | 1078 | |
1e791a74 | 1079 | assert(session); |
2f77fc4b DG |
1080 | |
1081 | usess = session->ust_session; | |
1082 | ksess = session->kernel_session; | |
1083 | ||
785d2d0d | 1084 | DBG("Setting relayd for session %s", session->name); |
2f77fc4b | 1085 | |
aa997ea3 | 1086 | rcu_read_lock(); |
1e791a74 JG |
1087 | if (session->current_trace_chunk) { |
1088 | enum lttng_trace_chunk_status status = lttng_trace_chunk_get_id( | |
1089 | session->current_trace_chunk, ¤t_chunk_id.value); | |
1090 | ||
1091 | if (status == LTTNG_TRACE_CHUNK_STATUS_OK) { | |
1092 | current_chunk_id.is_set = true; | |
1093 | } else { | |
1094 | ERR("Failed to get current trace chunk id"); | |
1095 | ret = LTTNG_ERR_UNK; | |
1096 | goto error; | |
1097 | } | |
1098 | } | |
1099 | ||
2f77fc4b DG |
1100 | if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET |
1101 | && usess->consumer->enabled) { | |
1102 | /* For each consumer socket, send relayd sockets */ | |
1103 | cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, | |
1104 | socket, node.node) { | |
2f77fc4b | 1105 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1106 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id, |
d3e2ba59 JD |
1107 | usess->consumer, socket, |
1108 | session->name, session->hostname, | |
6fa5fe7c | 1109 | session->base_path, |
1e791a74 | 1110 | session->live_timer, |
db1da059 | 1111 | current_chunk_id.is_set ? ¤t_chunk_id.value : NULL, |
46ef2188 MD |
1112 | session->creation_time, |
1113 | session->name_contains_creation_time); | |
2f77fc4b | 1114 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1115 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1116 | goto error; |
1117 | } | |
6dc3064a DG |
1118 | /* Session is now ready for network streaming. */ |
1119 | session->net_handle = 1; | |
2f77fc4b | 1120 | } |
b31610f2 JD |
1121 | session->consumer->relay_major_version = |
1122 | usess->consumer->relay_major_version; | |
1123 | session->consumer->relay_minor_version = | |
1124 | usess->consumer->relay_minor_version; | |
eacb7b6f MD |
1125 | session->consumer->relay_allows_clear = |
1126 | usess->consumer->relay_allows_clear; | |
2f77fc4b DG |
1127 | } |
1128 | ||
1129 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET | |
1130 | && ksess->consumer->enabled) { | |
1131 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1132 | socket, node.node) { | |
2f77fc4b | 1133 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1134 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id, |
d3e2ba59 JD |
1135 | ksess->consumer, socket, |
1136 | session->name, session->hostname, | |
6fa5fe7c | 1137 | session->base_path, |
1e791a74 | 1138 | session->live_timer, |
db1da059 | 1139 | current_chunk_id.is_set ? ¤t_chunk_id.value : NULL, |
46ef2188 MD |
1140 | session->creation_time, |
1141 | session->name_contains_creation_time); | |
2f77fc4b | 1142 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1143 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1144 | goto error; |
1145 | } | |
6dc3064a DG |
1146 | /* Session is now ready for network streaming. */ |
1147 | session->net_handle = 1; | |
2f77fc4b | 1148 | } |
b31610f2 JD |
1149 | session->consumer->relay_major_version = |
1150 | ksess->consumer->relay_major_version; | |
1151 | session->consumer->relay_minor_version = | |
1152 | ksess->consumer->relay_minor_version; | |
eacb7b6f MD |
1153 | session->consumer->relay_allows_clear = |
1154 | ksess->consumer->relay_allows_clear; | |
2f77fc4b DG |
1155 | } |
1156 | ||
1157 | error: | |
e7fe706f | 1158 | rcu_read_unlock(); |
2f77fc4b DG |
1159 | return ret; |
1160 | } | |
1161 | ||
9b6c7ec5 DG |
1162 | /* |
1163 | * Start a kernel session by opening all necessary streams. | |
1164 | */ | |
4dbe1875 | 1165 | int start_kernel_session(struct ltt_kernel_session *ksess) |
9b6c7ec5 DG |
1166 | { |
1167 | int ret; | |
1168 | struct ltt_kernel_channel *kchan; | |
1169 | ||
1170 | /* Open kernel metadata */ | |
07b86b52 | 1171 | if (ksess->metadata == NULL && ksess->output_traces) { |
9b6c7ec5 DG |
1172 | ret = kernel_open_metadata(ksess); |
1173 | if (ret < 0) { | |
1174 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1175 | goto error; | |
1176 | } | |
1177 | } | |
1178 | ||
1179 | /* Open kernel metadata stream */ | |
07b86b52 | 1180 | if (ksess->metadata && ksess->metadata_stream_fd < 0) { |
9b6c7ec5 DG |
1181 | ret = kernel_open_metadata_stream(ksess); |
1182 | if (ret < 0) { | |
1183 | ERR("Kernel create metadata stream failed"); | |
1184 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1185 | goto error; | |
1186 | } | |
1187 | } | |
1188 | ||
1189 | /* For each channel */ | |
1190 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
1191 | if (kchan->stream_count == 0) { | |
1192 | ret = kernel_open_channel_stream(kchan); | |
1193 | if (ret < 0) { | |
1194 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1195 | goto error; | |
1196 | } | |
1197 | /* Update the stream global counter */ | |
1198 | ksess->stream_count_global += ret; | |
1199 | } | |
1200 | } | |
1201 | ||
1202 | /* Setup kernel consumer socket and send fds to it */ | |
1203 | ret = init_kernel_tracing(ksess); | |
e43c41c5 | 1204 | if (ret != 0) { |
9b6c7ec5 DG |
1205 | ret = LTTNG_ERR_KERN_START_FAIL; |
1206 | goto error; | |
1207 | } | |
1208 | ||
1209 | /* This start the kernel tracing */ | |
1210 | ret = kernel_start_session(ksess); | |
1211 | if (ret < 0) { | |
1212 | ret = LTTNG_ERR_KERN_START_FAIL; | |
1213 | goto error; | |
1214 | } | |
1215 | ||
1216 | /* Quiescent wait after starting trace */ | |
7d268848 | 1217 | kernel_wait_quiescent(); |
9b6c7ec5 | 1218 | |
14fb1ebe | 1219 | ksess->active = 1; |
9b6c7ec5 DG |
1220 | |
1221 | ret = LTTNG_OK; | |
1222 | ||
1223 | error: | |
1224 | return ret; | |
1225 | } | |
1226 | ||
4dbe1875 MD |
1227 | int stop_kernel_session(struct ltt_kernel_session *ksess) |
1228 | { | |
1229 | struct ltt_kernel_channel *kchan; | |
1230 | bool error_occurred = false; | |
1231 | int ret; | |
1232 | ||
1233 | if (!ksess || !ksess->active) { | |
1234 | return LTTNG_OK; | |
1235 | } | |
1236 | DBG("Stopping kernel tracing"); | |
1237 | ||
1238 | ret = kernel_stop_session(ksess); | |
1239 | if (ret < 0) { | |
1240 | ret = LTTNG_ERR_KERN_STOP_FAIL; | |
1241 | goto error; | |
1242 | } | |
1243 | ||
1244 | kernel_wait_quiescent(); | |
1245 | ||
1246 | /* Flush metadata after stopping (if exists) */ | |
1247 | if (ksess->metadata_stream_fd >= 0) { | |
1248 | ret = kernel_metadata_flush_buffer(ksess->metadata_stream_fd); | |
1249 | if (ret < 0) { | |
1250 | ERR("Kernel metadata flush failed"); | |
1251 | error_occurred = true; | |
1252 | } | |
1253 | } | |
1254 | ||
1255 | /* Flush all buffers after stopping */ | |
1256 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
1257 | ret = kernel_flush_buffer(kchan); | |
1258 | if (ret < 0) { | |
1259 | ERR("Kernel flush buffer error"); | |
1260 | error_occurred = true; | |
1261 | } | |
1262 | } | |
1263 | ||
1264 | ksess->active = 0; | |
1265 | if (error_occurred) { | |
1266 | ret = LTTNG_ERR_UNK; | |
1267 | } else { | |
1268 | ret = LTTNG_OK; | |
1269 | } | |
1270 | error: | |
1271 | return ret; | |
1272 | } | |
1273 | ||
2f77fc4b DG |
1274 | /* |
1275 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. | |
1276 | */ | |
56a37563 JG |
1277 | int cmd_disable_channel(struct ltt_session *session, |
1278 | enum lttng_domain_type domain, char *channel_name) | |
2f77fc4b DG |
1279 | { |
1280 | int ret; | |
1281 | struct ltt_ust_session *usess; | |
1282 | ||
1283 | usess = session->ust_session; | |
1284 | ||
2223c96f DG |
1285 | rcu_read_lock(); |
1286 | ||
2f77fc4b DG |
1287 | switch (domain) { |
1288 | case LTTNG_DOMAIN_KERNEL: | |
1289 | { | |
1290 | ret = channel_kernel_disable(session->kernel_session, | |
1291 | channel_name); | |
f73fabfd | 1292 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1293 | goto error; |
1294 | } | |
1295 | ||
7d268848 | 1296 | kernel_wait_quiescent(); |
2f77fc4b DG |
1297 | break; |
1298 | } | |
1299 | case LTTNG_DOMAIN_UST: | |
1300 | { | |
1301 | struct ltt_ust_channel *uchan; | |
1302 | struct lttng_ht *chan_ht; | |
1303 | ||
1304 | chan_ht = usess->domain_global.channels; | |
1305 | ||
1306 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
1307 | if (uchan == NULL) { | |
f73fabfd | 1308 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
1309 | goto error; |
1310 | } | |
1311 | ||
7972aab2 | 1312 | ret = channel_ust_disable(usess, uchan); |
f73fabfd | 1313 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1314 | goto error; |
1315 | } | |
1316 | break; | |
1317 | } | |
2f77fc4b | 1318 | default: |
f73fabfd | 1319 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1320 | goto error; |
1321 | } | |
1322 | ||
f73fabfd | 1323 | ret = LTTNG_OK; |
2f77fc4b DG |
1324 | |
1325 | error: | |
2223c96f | 1326 | rcu_read_unlock(); |
2f77fc4b DG |
1327 | return ret; |
1328 | } | |
1329 | ||
1330 | /* | |
1331 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
1332 | * | |
1333 | * The wpipe arguments is used as a notifier for the kernel thread. | |
1334 | */ | |
1335 | int cmd_enable_channel(struct ltt_session *session, | |
df4f5a87 | 1336 | const struct lttng_domain *domain, const struct lttng_channel *_attr, int wpipe) |
2f77fc4b DG |
1337 | { |
1338 | int ret; | |
1339 | struct ltt_ust_session *usess = session->ust_session; | |
1340 | struct lttng_ht *chan_ht; | |
1f345e94 | 1341 | size_t len; |
df4f5a87 | 1342 | struct lttng_channel attr; |
2f77fc4b DG |
1343 | |
1344 | assert(session); | |
df4f5a87 | 1345 | assert(_attr); |
7972aab2 | 1346 | assert(domain); |
2f77fc4b | 1347 | |
df4f5a87 JG |
1348 | attr = *_attr; |
1349 | len = lttng_strnlen(attr.name, sizeof(attr.name)); | |
1f345e94 PP |
1350 | |
1351 | /* Validate channel name */ | |
df4f5a87 JG |
1352 | if (attr.name[0] == '.' || |
1353 | memchr(attr.name, '/', len) != NULL) { | |
1f345e94 PP |
1354 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; |
1355 | goto end; | |
1356 | } | |
1357 | ||
df4f5a87 | 1358 | DBG("Enabling channel %s for session %s", attr.name, session->name); |
2f77fc4b | 1359 | |
03b4fdcf DG |
1360 | rcu_read_lock(); |
1361 | ||
ecc48a90 JD |
1362 | /* |
1363 | * Don't try to enable a channel if the session has been started at | |
1364 | * some point in time before. The tracer does not allow it. | |
1365 | */ | |
8382cf6f | 1366 | if (session->has_been_started) { |
ecc48a90 JD |
1367 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
1368 | goto error; | |
1369 | } | |
1370 | ||
1371 | /* | |
1372 | * If the session is a live session, remove the switch timer, the | |
1373 | * live timer does the same thing but sends also synchronisation | |
1374 | * beacons for inactive streams. | |
1375 | */ | |
1376 | if (session->live_timer > 0) { | |
df4f5a87 JG |
1377 | attr.attr.live_timer_interval = session->live_timer; |
1378 | attr.attr.switch_timer_interval = 0; | |
ecc48a90 JD |
1379 | } |
1380 | ||
6e21424e JR |
1381 | /* Check for feature support */ |
1382 | switch (domain->type) { | |
1383 | case LTTNG_DOMAIN_KERNEL: | |
1384 | { | |
7d268848 | 1385 | if (kernel_supports_ring_buffer_snapshot_sample_positions() != 1) { |
6e21424e JR |
1386 | /* Sampling position of buffer is not supported */ |
1387 | WARN("Kernel tracer does not support buffer monitoring. " | |
1388 | "Setting the monitor interval timer to 0 " | |
1389 | "(disabled) for channel '%s' of session '%s'", | |
df4f5a87 JG |
1390 | attr.name, session->name); |
1391 | lttng_channel_set_monitor_timer_interval(&attr, 0); | |
6e21424e JR |
1392 | } |
1393 | break; | |
1394 | } | |
1395 | case LTTNG_DOMAIN_UST: | |
f28f9e44 | 1396 | break; |
6e21424e JR |
1397 | case LTTNG_DOMAIN_JUL: |
1398 | case LTTNG_DOMAIN_LOG4J: | |
1399 | case LTTNG_DOMAIN_PYTHON: | |
f28f9e44 JG |
1400 | if (!agent_tracing_is_enabled()) { |
1401 | DBG("Attempted to enable a channel in an agent domain but the agent thread is not running"); | |
1402 | ret = LTTNG_ERR_AGENT_TRACING_DISABLED; | |
1403 | goto error; | |
1404 | } | |
6e21424e JR |
1405 | break; |
1406 | default: | |
1407 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1408 | goto error; | |
1409 | } | |
1410 | ||
7972aab2 | 1411 | switch (domain->type) { |
2f77fc4b DG |
1412 | case LTTNG_DOMAIN_KERNEL: |
1413 | { | |
1414 | struct ltt_kernel_channel *kchan; | |
1415 | ||
df4f5a87 | 1416 | kchan = trace_kernel_get_channel_by_name(attr.name, |
2f77fc4b DG |
1417 | session->kernel_session); |
1418 | if (kchan == NULL) { | |
54213acc JG |
1419 | if (session->snapshot.nb_output > 0 || |
1420 | session->snapshot_mode) { | |
1421 | /* Enforce mmap output for snapshot sessions. */ | |
df4f5a87 | 1422 | attr.attr.output = LTTNG_EVENT_MMAP; |
54213acc | 1423 | } |
df4f5a87 JG |
1424 | ret = channel_kernel_create(session->kernel_session, &attr, wpipe); |
1425 | if (attr.name[0] != '\0') { | |
85076754 MD |
1426 | session->kernel_session->has_non_default_channel = 1; |
1427 | } | |
2f77fc4b DG |
1428 | } else { |
1429 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
1430 | } | |
1431 | ||
f73fabfd | 1432 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1433 | goto error; |
1434 | } | |
1435 | ||
7d268848 | 1436 | kernel_wait_quiescent(); |
2f77fc4b DG |
1437 | break; |
1438 | } | |
1439 | case LTTNG_DOMAIN_UST: | |
9232818f JG |
1440 | case LTTNG_DOMAIN_JUL: |
1441 | case LTTNG_DOMAIN_LOG4J: | |
1442 | case LTTNG_DOMAIN_PYTHON: | |
2f77fc4b DG |
1443 | { |
1444 | struct ltt_ust_channel *uchan; | |
1445 | ||
9232818f JG |
1446 | /* |
1447 | * FIXME | |
1448 | * | |
1449 | * Current agent implementation limitations force us to allow | |
1450 | * only one channel at once in "agent" subdomains. Each | |
1451 | * subdomain has a default channel name which must be strictly | |
1452 | * adhered to. | |
1453 | */ | |
1454 | if (domain->type == LTTNG_DOMAIN_JUL) { | |
df4f5a87 | 1455 | if (strncmp(attr.name, DEFAULT_JUL_CHANNEL_NAME, |
9232818f JG |
1456 | LTTNG_SYMBOL_NAME_LEN)) { |
1457 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1458 | goto error; | |
1459 | } | |
1460 | } else if (domain->type == LTTNG_DOMAIN_LOG4J) { | |
df4f5a87 | 1461 | if (strncmp(attr.name, DEFAULT_LOG4J_CHANNEL_NAME, |
9232818f JG |
1462 | LTTNG_SYMBOL_NAME_LEN)) { |
1463 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1464 | goto error; | |
1465 | } | |
1466 | } else if (domain->type == LTTNG_DOMAIN_PYTHON) { | |
df4f5a87 | 1467 | if (strncmp(attr.name, DEFAULT_PYTHON_CHANNEL_NAME, |
9232818f JG |
1468 | LTTNG_SYMBOL_NAME_LEN)) { |
1469 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1470 | goto error; | |
1471 | } | |
1472 | } | |
1473 | ||
2f77fc4b DG |
1474 | chan_ht = usess->domain_global.channels; |
1475 | ||
df4f5a87 | 1476 | uchan = trace_ust_find_channel_by_name(chan_ht, attr.name); |
2f77fc4b | 1477 | if (uchan == NULL) { |
df4f5a87 JG |
1478 | ret = channel_ust_create(usess, &attr, domain->buf_type); |
1479 | if (attr.name[0] != '\0') { | |
85076754 MD |
1480 | usess->has_non_default_channel = 1; |
1481 | } | |
2f77fc4b | 1482 | } else { |
7972aab2 | 1483 | ret = channel_ust_enable(usess, uchan); |
2f77fc4b DG |
1484 | } |
1485 | break; | |
1486 | } | |
2f77fc4b | 1487 | default: |
f73fabfd | 1488 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1489 | goto error; |
1490 | } | |
1491 | ||
df4f5a87 | 1492 | if (ret == LTTNG_OK && attr.attr.output != LTTNG_EVENT_MMAP) { |
54213acc JG |
1493 | session->has_non_mmap_channel = true; |
1494 | } | |
2f77fc4b | 1495 | error: |
2223c96f | 1496 | rcu_read_unlock(); |
1f345e94 | 1497 | end: |
2f77fc4b DG |
1498 | return ret; |
1499 | } | |
1500 | ||
159b042f JG |
1501 | enum lttng_error_code cmd_process_attr_tracker_get_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 | const struct process_attr_tracker *tracker; | |
1509 | ||
1510 | switch (domain) { | |
1511 | case LTTNG_DOMAIN_KERNEL: | |
1512 | if (!session->kernel_session) { | |
1513 | ret_code = LTTNG_ERR_INVALID; | |
1514 | goto end; | |
1515 | } | |
1516 | tracker = kernel_get_process_attr_tracker( | |
1517 | session->kernel_session, process_attr); | |
1518 | break; | |
1519 | case LTTNG_DOMAIN_UST: | |
1520 | if (!session->ust_session) { | |
1521 | ret_code = LTTNG_ERR_INVALID; | |
1522 | goto end; | |
1523 | } | |
1524 | tracker = trace_ust_get_process_attr_tracker( | |
1525 | session->ust_session, process_attr); | |
1526 | break; | |
1527 | default: | |
1528 | ret_code = LTTNG_ERR_UNSUPPORTED_DOMAIN; | |
1529 | goto end; | |
1530 | } | |
1531 | if (tracker) { | |
1532 | *policy = process_attr_tracker_get_tracking_policy(tracker); | |
1533 | } else { | |
1534 | ret_code = LTTNG_ERR_INVALID; | |
1535 | } | |
1536 | end: | |
1537 | return ret_code; | |
1538 | } | |
1539 | ||
1540 | enum lttng_error_code cmd_process_attr_tracker_set_tracking_policy( | |
1541 | struct ltt_session *session, | |
1542 | enum lttng_domain_type domain, | |
1543 | enum lttng_process_attr process_attr, | |
1544 | enum lttng_tracking_policy policy) | |
1545 | { | |
1546 | enum lttng_error_code ret_code = LTTNG_OK; | |
1547 | ||
1548 | switch (policy) { | |
1549 | case LTTNG_TRACKING_POLICY_INCLUDE_SET: | |
1550 | case LTTNG_TRACKING_POLICY_EXCLUDE_ALL: | |
1551 | case LTTNG_TRACKING_POLICY_INCLUDE_ALL: | |
1552 | break; | |
1553 | default: | |
1554 | ret_code = LTTNG_ERR_INVALID; | |
1555 | goto end; | |
1556 | } | |
1557 | ||
1558 | switch (domain) { | |
1559 | case LTTNG_DOMAIN_KERNEL: | |
1560 | if (!session->kernel_session) { | |
1561 | ret_code = LTTNG_ERR_INVALID; | |
1562 | goto end; | |
1563 | } | |
1564 | ret_code = kernel_process_attr_tracker_set_tracking_policy( | |
1565 | session->kernel_session, process_attr, policy); | |
1566 | break; | |
1567 | case LTTNG_DOMAIN_UST: | |
1568 | if (!session->ust_session) { | |
1569 | ret_code = LTTNG_ERR_INVALID; | |
1570 | goto end; | |
1571 | } | |
1572 | ret_code = trace_ust_process_attr_tracker_set_tracking_policy( | |
1573 | session->ust_session, process_attr, policy); | |
1574 | break; | |
1575 | default: | |
1576 | ret_code = LTTNG_ERR_UNSUPPORTED_DOMAIN; | |
1577 | break; | |
1578 | } | |
1579 | end: | |
1580 | return ret_code; | |
1581 | } | |
1582 | ||
1583 | enum lttng_error_code cmd_process_attr_tracker_inclusion_set_add_value( | |
1584 | struct ltt_session *session, | |
1585 | enum lttng_domain_type domain, | |
1586 | enum lttng_process_attr process_attr, | |
1587 | const struct process_attr_value *value) | |
1588 | { | |
1589 | enum lttng_error_code ret_code = LTTNG_OK; | |
1590 | ||
1591 | switch (domain) { | |
1592 | case LTTNG_DOMAIN_KERNEL: | |
1593 | if (!session->kernel_session) { | |
1594 | ret_code = LTTNG_ERR_INVALID; | |
1595 | goto end; | |
1596 | } | |
1597 | ret_code = kernel_process_attr_tracker_inclusion_set_add_value( | |
1598 | session->kernel_session, process_attr, value); | |
1599 | break; | |
1600 | case LTTNG_DOMAIN_UST: | |
1601 | if (!session->ust_session) { | |
1602 | ret_code = LTTNG_ERR_INVALID; | |
1603 | goto end; | |
1604 | } | |
1605 | ret_code = trace_ust_process_attr_tracker_inclusion_set_add_value( | |
1606 | session->ust_session, process_attr, value); | |
1607 | break; | |
1608 | default: | |
1609 | ret_code = LTTNG_ERR_UNSUPPORTED_DOMAIN; | |
1610 | break; | |
1611 | } | |
1612 | end: | |
1613 | return ret_code; | |
1614 | } | |
1615 | ||
1616 | enum lttng_error_code cmd_process_attr_tracker_inclusion_set_remove_value( | |
1617 | struct ltt_session *session, | |
1618 | enum lttng_domain_type domain, | |
1619 | enum lttng_process_attr process_attr, | |
1620 | const struct process_attr_value *value) | |
1621 | { | |
1622 | enum lttng_error_code ret_code = LTTNG_OK; | |
1623 | ||
1624 | switch (domain) { | |
1625 | case LTTNG_DOMAIN_KERNEL: | |
1626 | if (!session->kernel_session) { | |
1627 | ret_code = LTTNG_ERR_INVALID; | |
1628 | goto end; | |
1629 | } | |
1630 | ret_code = kernel_process_attr_tracker_inclusion_set_remove_value( | |
1631 | session->kernel_session, process_attr, value); | |
1632 | break; | |
1633 | case LTTNG_DOMAIN_UST: | |
1634 | if (!session->ust_session) { | |
1635 | ret_code = LTTNG_ERR_INVALID; | |
1636 | goto end; | |
1637 | } | |
1638 | ret_code = trace_ust_process_attr_tracker_inclusion_set_remove_value( | |
1639 | session->ust_session, process_attr, value); | |
1640 | break; | |
1641 | default: | |
1642 | ret_code = LTTNG_ERR_UNSUPPORTED_DOMAIN; | |
1643 | break; | |
1644 | } | |
1645 | end: | |
1646 | return ret_code; | |
1647 | } | |
1648 | ||
1649 | enum lttng_error_code cmd_process_attr_tracker_get_inclusion_set( | |
1650 | struct ltt_session *session, | |
1651 | enum lttng_domain_type domain, | |
1652 | enum lttng_process_attr process_attr, | |
1653 | struct lttng_process_attr_values **values) | |
1654 | { | |
1655 | enum lttng_error_code ret_code = LTTNG_OK; | |
1656 | const struct process_attr_tracker *tracker; | |
1657 | enum process_attr_tracker_status status; | |
1658 | ||
1659 | switch (domain) { | |
1660 | case LTTNG_DOMAIN_KERNEL: | |
1661 | if (!session->kernel_session) { | |
1662 | ret_code = LTTNG_ERR_INVALID; | |
1663 | goto end; | |
1664 | } | |
1665 | tracker = kernel_get_process_attr_tracker( | |
1666 | session->kernel_session, process_attr); | |
1667 | break; | |
1668 | case LTTNG_DOMAIN_UST: | |
1669 | if (!session->ust_session) { | |
1670 | ret_code = LTTNG_ERR_INVALID; | |
1671 | goto end; | |
1672 | } | |
1673 | tracker = trace_ust_get_process_attr_tracker( | |
1674 | session->ust_session, process_attr); | |
1675 | break; | |
1676 | default: | |
1677 | ret_code = LTTNG_ERR_UNSUPPORTED_DOMAIN; | |
1678 | goto end; | |
1679 | } | |
1680 | ||
1681 | if (!tracker) { | |
1682 | ret_code = LTTNG_ERR_INVALID; | |
1683 | goto end; | |
1684 | } | |
1685 | ||
1686 | status = process_attr_tracker_get_inclusion_set(tracker, values); | |
1687 | switch (status) { | |
1688 | case PROCESS_ATTR_TRACKER_STATUS_OK: | |
1689 | ret_code = LTTNG_OK; | |
1690 | break; | |
1691 | case PROCESS_ATTR_TRACKER_STATUS_INVALID_TRACKING_POLICY: | |
1692 | ret_code = LTTNG_ERR_PROCESS_ATTR_TRACKER_INVALID_TRACKING_POLICY; | |
1693 | break; | |
1694 | case PROCESS_ATTR_TRACKER_STATUS_ERROR: | |
1695 | ret_code = LTTNG_ERR_NOMEM; | |
1696 | break; | |
1697 | default: | |
1698 | ret_code = LTTNG_ERR_UNK; | |
1699 | break; | |
1700 | } | |
1701 | ||
1702 | end: | |
1703 | return ret_code; | |
1704 | } | |
1705 | ||
2f77fc4b DG |
1706 | /* |
1707 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1708 | */ | |
56a37563 | 1709 | int cmd_disable_event(struct ltt_session *session, |
df4f5a87 JG |
1710 | enum lttng_domain_type domain, const char *channel_name, |
1711 | const struct lttng_event *event) | |
2f77fc4b DG |
1712 | { |
1713 | int ret; | |
df4f5a87 | 1714 | const char *event_name; |
6e911cad | 1715 | |
18a720cd MD |
1716 | DBG("Disable event command for event \'%s\'", event->name); |
1717 | ||
6e911cad MD |
1718 | event_name = event->name; |
1719 | ||
9b7431cf JG |
1720 | /* Error out on unhandled search criteria */ |
1721 | if (event->loglevel_type || event->loglevel != -1 || event->enabled | |
6e911cad | 1722 | || event->pid || event->filter || event->exclusion) { |
7076b56e JG |
1723 | ret = LTTNG_ERR_UNK; |
1724 | goto error; | |
6e911cad | 1725 | } |
2f77fc4b | 1726 | |
2223c96f DG |
1727 | rcu_read_lock(); |
1728 | ||
2f77fc4b DG |
1729 | switch (domain) { |
1730 | case LTTNG_DOMAIN_KERNEL: | |
1731 | { | |
1732 | struct ltt_kernel_channel *kchan; | |
1733 | struct ltt_kernel_session *ksess; | |
1734 | ||
1735 | ksess = session->kernel_session; | |
1736 | ||
85076754 MD |
1737 | /* |
1738 | * If a non-default channel has been created in the | |
1739 | * session, explicitely require that -c chan_name needs | |
1740 | * to be provided. | |
1741 | */ | |
1742 | if (ksess->has_non_default_channel && channel_name[0] == '\0') { | |
1743 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1744 | goto error_unlock; |
85076754 MD |
1745 | } |
1746 | ||
2f77fc4b DG |
1747 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
1748 | if (kchan == NULL) { | |
f73fabfd | 1749 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
7076b56e | 1750 | goto error_unlock; |
2f77fc4b DG |
1751 | } |
1752 | ||
6e911cad MD |
1753 | switch (event->type) { |
1754 | case LTTNG_EVENT_ALL: | |
9550ee81 | 1755 | case LTTNG_EVENT_TRACEPOINT: |
d0ae4ea8 | 1756 | case LTTNG_EVENT_SYSCALL: |
9550ee81 JR |
1757 | case LTTNG_EVENT_PROBE: |
1758 | case LTTNG_EVENT_FUNCTION: | |
1759 | case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */ | |
1760 | if (event_name[0] == '\0') { | |
1761 | ret = event_kernel_disable_event(kchan, | |
1762 | NULL, event->type); | |
29c62722 | 1763 | } else { |
d0ae4ea8 | 1764 | ret = event_kernel_disable_event(kchan, |
9550ee81 | 1765 | event_name, event->type); |
29c62722 | 1766 | } |
6e911cad | 1767 | if (ret != LTTNG_OK) { |
7076b56e | 1768 | goto error_unlock; |
6e911cad MD |
1769 | } |
1770 | break; | |
6e911cad MD |
1771 | default: |
1772 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1773 | goto error_unlock; |
2f77fc4b DG |
1774 | } |
1775 | ||
7d268848 | 1776 | kernel_wait_quiescent(); |
2f77fc4b DG |
1777 | break; |
1778 | } | |
1779 | case LTTNG_DOMAIN_UST: | |
1780 | { | |
1781 | struct ltt_ust_channel *uchan; | |
1782 | struct ltt_ust_session *usess; | |
1783 | ||
1784 | usess = session->ust_session; | |
1785 | ||
7076b56e JG |
1786 | if (validate_ust_event_name(event_name)) { |
1787 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1788 | goto error_unlock; | |
1789 | } | |
1790 | ||
85076754 MD |
1791 | /* |
1792 | * If a non-default channel has been created in the | |
9550ee81 | 1793 | * session, explicitly require that -c chan_name needs |
85076754 MD |
1794 | * to be provided. |
1795 | */ | |
1796 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1797 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1798 | goto error_unlock; |
85076754 MD |
1799 | } |
1800 | ||
2f77fc4b DG |
1801 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
1802 | channel_name); | |
1803 | if (uchan == NULL) { | |
f73fabfd | 1804 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
7076b56e | 1805 | goto error_unlock; |
2f77fc4b DG |
1806 | } |
1807 | ||
6e911cad MD |
1808 | switch (event->type) { |
1809 | case LTTNG_EVENT_ALL: | |
b3639870 JR |
1810 | /* |
1811 | * An empty event name means that everything | |
1812 | * should be disabled. | |
1813 | */ | |
1814 | if (event->name[0] == '\0') { | |
1815 | ret = event_ust_disable_all_tracepoints(usess, uchan); | |
77d536b2 JR |
1816 | } else { |
1817 | ret = event_ust_disable_tracepoint(usess, uchan, | |
1818 | event_name); | |
1819 | } | |
6e911cad | 1820 | if (ret != LTTNG_OK) { |
7076b56e | 1821 | goto error_unlock; |
6e911cad MD |
1822 | } |
1823 | break; | |
1824 | default: | |
1825 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1826 | goto error_unlock; |
2f77fc4b DG |
1827 | } |
1828 | ||
1829 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
1830 | channel_name); | |
1831 | break; | |
1832 | } | |
5cdb6027 | 1833 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1834 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1835 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1836 | { |
fefd409b | 1837 | struct agent *agt; |
f20baf8e DG |
1838 | struct ltt_ust_session *usess = session->ust_session; |
1839 | ||
1840 | assert(usess); | |
1841 | ||
6e911cad MD |
1842 | switch (event->type) { |
1843 | case LTTNG_EVENT_ALL: | |
1844 | break; | |
1845 | default: | |
1846 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1847 | goto error_unlock; |
6e911cad MD |
1848 | } |
1849 | ||
5cdb6027 | 1850 | agt = trace_ust_find_agent(usess, domain); |
fefd409b DG |
1851 | if (!agt) { |
1852 | ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
7076b56e | 1853 | goto error_unlock; |
fefd409b | 1854 | } |
b3639870 JR |
1855 | /* |
1856 | * An empty event name means that everything | |
1857 | * should be disabled. | |
1858 | */ | |
1859 | if (event->name[0] == '\0') { | |
18a720cd MD |
1860 | ret = event_agent_disable_all(usess, agt); |
1861 | } else { | |
1862 | ret = event_agent_disable(usess, agt, event_name); | |
1863 | } | |
f20baf8e | 1864 | if (ret != LTTNG_OK) { |
7076b56e | 1865 | goto error_unlock; |
f20baf8e DG |
1866 | } |
1867 | ||
1868 | break; | |
1869 | } | |
2f77fc4b | 1870 | default: |
f73fabfd | 1871 | ret = LTTNG_ERR_UND; |
7076b56e | 1872 | goto error_unlock; |
2f77fc4b DG |
1873 | } |
1874 | ||
f73fabfd | 1875 | ret = LTTNG_OK; |
2f77fc4b | 1876 | |
7076b56e | 1877 | error_unlock: |
2223c96f | 1878 | rcu_read_unlock(); |
7076b56e | 1879 | error: |
2f77fc4b DG |
1880 | return ret; |
1881 | } | |
1882 | ||
2f77fc4b DG |
1883 | /* |
1884 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1885 | */ | |
56a37563 | 1886 | int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain, |
df4f5a87 | 1887 | char *channel_name, const struct lttng_event_context *ctx, int kwpipe) |
2f77fc4b | 1888 | { |
d5979e4a | 1889 | int ret, chan_kern_created = 0, chan_ust_created = 0; |
bdf64013 JG |
1890 | char *app_ctx_provider_name = NULL, *app_ctx_name = NULL; |
1891 | ||
9a699f7b JR |
1892 | /* |
1893 | * Don't try to add a context if the session has been started at | |
1894 | * some point in time before. The tracer does not allow it and would | |
1895 | * result in a corrupted trace. | |
1896 | */ | |
1897 | if (session->has_been_started) { | |
1898 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; | |
1899 | goto end; | |
1900 | } | |
1901 | ||
bdf64013 JG |
1902 | if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) { |
1903 | app_ctx_provider_name = ctx->u.app_ctx.provider_name; | |
1904 | app_ctx_name = ctx->u.app_ctx.ctx_name; | |
1905 | } | |
2f77fc4b DG |
1906 | |
1907 | switch (domain) { | |
1908 | case LTTNG_DOMAIN_KERNEL: | |
979e618e DG |
1909 | assert(session->kernel_session); |
1910 | ||
1911 | if (session->kernel_session->channel_count == 0) { | |
1912 | /* Create default channel */ | |
1913 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); | |
1914 | if (ret != LTTNG_OK) { | |
1915 | goto error; | |
1916 | } | |
d5979e4a | 1917 | chan_kern_created = 1; |
979e618e | 1918 | } |
2f77fc4b | 1919 | /* Add kernel context to kernel tracer */ |
601d5acf | 1920 | ret = context_kernel_add(session->kernel_session, ctx, channel_name); |
f73fabfd | 1921 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1922 | goto error; |
1923 | } | |
1924 | break; | |
bdf64013 JG |
1925 | case LTTNG_DOMAIN_JUL: |
1926 | case LTTNG_DOMAIN_LOG4J: | |
1927 | { | |
1928 | /* | |
1929 | * Validate channel name. | |
1930 | * If no channel name is given and the domain is JUL or LOG4J, | |
1931 | * set it to the appropriate domain-specific channel name. If | |
1932 | * a name is provided but does not match the expexted channel | |
1933 | * name, return an error. | |
1934 | */ | |
1935 | if (domain == LTTNG_DOMAIN_JUL && *channel_name && | |
1936 | strcmp(channel_name, | |
1937 | DEFAULT_JUL_CHANNEL_NAME)) { | |
1938 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1939 | goto error; | |
1940 | } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name && | |
1941 | strcmp(channel_name, | |
1942 | DEFAULT_LOG4J_CHANNEL_NAME)) { | |
1943 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1944 | goto error; | |
1945 | } | |
a93b3916 | 1946 | /* break is _not_ missing here. */ |
bdf64013 | 1947 | } |
2f77fc4b DG |
1948 | case LTTNG_DOMAIN_UST: |
1949 | { | |
1950 | struct ltt_ust_session *usess = session->ust_session; | |
85076754 MD |
1951 | unsigned int chan_count; |
1952 | ||
2f77fc4b DG |
1953 | assert(usess); |
1954 | ||
85076754 | 1955 | chan_count = lttng_ht_get_count(usess->domain_global.channels); |
979e618e DG |
1956 | if (chan_count == 0) { |
1957 | struct lttng_channel *attr; | |
1958 | /* Create default channel */ | |
0a9c6494 | 1959 | attr = channel_new_default_attr(domain, usess->buffer_type); |
979e618e DG |
1960 | if (attr == NULL) { |
1961 | ret = LTTNG_ERR_FATAL; | |
1962 | goto error; | |
1963 | } | |
1964 | ||
7972aab2 | 1965 | ret = channel_ust_create(usess, attr, usess->buffer_type); |
979e618e DG |
1966 | if (ret != LTTNG_OK) { |
1967 | free(attr); | |
1968 | goto error; | |
1969 | } | |
cf0bcb51 | 1970 | channel_attr_destroy(attr); |
d5979e4a | 1971 | chan_ust_created = 1; |
979e618e DG |
1972 | } |
1973 | ||
601d5acf | 1974 | ret = context_ust_add(usess, domain, ctx, channel_name); |
bdf64013 JG |
1975 | free(app_ctx_provider_name); |
1976 | free(app_ctx_name); | |
1977 | app_ctx_name = NULL; | |
1978 | app_ctx_provider_name = NULL; | |
f73fabfd | 1979 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1980 | goto error; |
1981 | } | |
1982 | break; | |
1983 | } | |
2f77fc4b | 1984 | default: |
f73fabfd | 1985 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1986 | goto error; |
1987 | } | |
1988 | ||
bdf64013 JG |
1989 | ret = LTTNG_OK; |
1990 | goto end; | |
2f77fc4b DG |
1991 | |
1992 | error: | |
d5979e4a DG |
1993 | if (chan_kern_created) { |
1994 | struct ltt_kernel_channel *kchan = | |
1995 | trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME, | |
1996 | session->kernel_session); | |
1997 | /* Created previously, this should NOT fail. */ | |
1998 | assert(kchan); | |
1999 | kernel_destroy_channel(kchan); | |
2000 | } | |
2001 | ||
2002 | if (chan_ust_created) { | |
2003 | struct ltt_ust_channel *uchan = | |
2004 | trace_ust_find_channel_by_name( | |
2005 | session->ust_session->domain_global.channels, | |
2006 | DEFAULT_CHANNEL_NAME); | |
2007 | /* Created previously, this should NOT fail. */ | |
2008 | assert(uchan); | |
2009 | /* Remove from the channel list of the session. */ | |
2010 | trace_ust_delete_channel(session->ust_session->domain_global.channels, | |
2011 | uchan); | |
2012 | trace_ust_destroy_channel(uchan); | |
2013 | } | |
bdf64013 JG |
2014 | end: |
2015 | free(app_ctx_provider_name); | |
2016 | free(app_ctx_name); | |
2f77fc4b DG |
2017 | return ret; |
2018 | } | |
2019 | ||
dac8e046 JG |
2020 | static inline bool name_starts_with(const char *name, const char *prefix) |
2021 | { | |
2022 | const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN); | |
2023 | ||
2024 | return !strncmp(name, prefix, max_cmp_len); | |
2025 | } | |
2026 | ||
2027 | /* Perform userspace-specific event name validation */ | |
2028 | static int validate_ust_event_name(const char *name) | |
2029 | { | |
2030 | int ret = 0; | |
2031 | ||
2032 | if (!name) { | |
2033 | ret = -1; | |
2034 | goto end; | |
2035 | } | |
2036 | ||
2037 | /* | |
2038 | * Check name against all internal UST event component namespaces used | |
2039 | * by the agents. | |
2040 | */ | |
2041 | if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) || | |
2042 | name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) || | |
2043 | name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) { | |
2044 | ret = -1; | |
2045 | } | |
2046 | ||
2047 | end: | |
2048 | return ret; | |
2049 | } | |
88f06f15 | 2050 | |
2f77fc4b | 2051 | /* |
88f06f15 JG |
2052 | * Internal version of cmd_enable_event() with a supplemental |
2053 | * "internal_event" flag which is used to enable internal events which should | |
2054 | * be hidden from clients. Such events are used in the agent implementation to | |
2055 | * enable the events through which all "agent" events are funeled. | |
2f77fc4b | 2056 | */ |
88f06f15 | 2057 | static int _cmd_enable_event(struct ltt_session *session, |
df4f5a87 | 2058 | const struct lttng_domain *domain, |
025faf73 | 2059 | char *channel_name, struct lttng_event *event, |
6b453b5e | 2060 | char *filter_expression, |
db8f1377 JI |
2061 | struct lttng_filter_bytecode *filter, |
2062 | struct lttng_event_exclusion *exclusion, | |
88f06f15 | 2063 | int wpipe, bool internal_event) |
2f77fc4b | 2064 | { |
9f449915 | 2065 | int ret = 0, channel_created = 0; |
cfedea03 | 2066 | struct lttng_channel *attr = NULL; |
2f77fc4b DG |
2067 | |
2068 | assert(session); | |
2069 | assert(event); | |
2070 | assert(channel_name); | |
2071 | ||
2a385866 JG |
2072 | /* If we have a filter, we must have its filter expression */ |
2073 | assert(!(!!filter_expression ^ !!filter)); | |
2074 | ||
9f449915 PP |
2075 | /* Normalize event name as a globbing pattern */ |
2076 | strutils_normalize_star_glob_pattern(event->name); | |
18a720cd | 2077 | |
9f449915 PP |
2078 | /* Normalize exclusion names as globbing patterns */ |
2079 | if (exclusion) { | |
2080 | size_t i; | |
f5ac4bd7 | 2081 | |
9f449915 PP |
2082 | for (i = 0; i < exclusion->count; i++) { |
2083 | char *name = LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i); | |
2084 | ||
2085 | strutils_normalize_star_glob_pattern(name); | |
2086 | } | |
930a2e99 JG |
2087 | } |
2088 | ||
9f449915 PP |
2089 | DBG("Enable event command for event \'%s\'", event->name); |
2090 | ||
2091 | rcu_read_lock(); | |
2092 | ||
7972aab2 | 2093 | switch (domain->type) { |
2f77fc4b DG |
2094 | case LTTNG_DOMAIN_KERNEL: |
2095 | { | |
2096 | struct ltt_kernel_channel *kchan; | |
2097 | ||
85076754 MD |
2098 | /* |
2099 | * If a non-default channel has been created in the | |
2100 | * session, explicitely require that -c chan_name needs | |
2101 | * to be provided. | |
2102 | */ | |
2103 | if (session->kernel_session->has_non_default_channel | |
2104 | && channel_name[0] == '\0') { | |
2105 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
2106 | goto error; | |
2107 | } | |
2108 | ||
2f77fc4b DG |
2109 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2110 | session->kernel_session); | |
2111 | if (kchan == NULL) { | |
0a9c6494 DG |
2112 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
2113 | LTTNG_BUFFER_GLOBAL); | |
2f77fc4b | 2114 | if (attr == NULL) { |
f73fabfd | 2115 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2116 | goto error; |
2117 | } | |
04c17253 MD |
2118 | if (lttng_strncpy(attr->name, channel_name, |
2119 | sizeof(attr->name))) { | |
2120 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
2121 | goto error; |
2122 | } | |
2f77fc4b DG |
2123 | |
2124 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 2125 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2126 | goto error; |
2127 | } | |
e5f5db7f | 2128 | channel_created = 1; |
2f77fc4b DG |
2129 | } |
2130 | ||
2131 | /* Get the newly created kernel channel pointer */ | |
2132 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2133 | session->kernel_session); | |
2134 | if (kchan == NULL) { | |
2135 | /* This sould not happen... */ | |
f73fabfd | 2136 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2137 | goto error; |
2138 | } | |
2139 | ||
6e911cad MD |
2140 | switch (event->type) { |
2141 | case LTTNG_EVENT_ALL: | |
29c62722 | 2142 | { |
00a62084 MD |
2143 | char *filter_expression_a = NULL; |
2144 | struct lttng_filter_bytecode *filter_a = NULL; | |
2145 | ||
2146 | /* | |
2147 | * We need to duplicate filter_expression and filter, | |
2148 | * because ownership is passed to first enable | |
2149 | * event. | |
2150 | */ | |
2151 | if (filter_expression) { | |
2152 | filter_expression_a = strdup(filter_expression); | |
2153 | if (!filter_expression_a) { | |
2154 | ret = LTTNG_ERR_FATAL; | |
2155 | goto error; | |
2156 | } | |
2157 | } | |
2158 | if (filter) { | |
2159 | filter_a = zmalloc(sizeof(*filter_a) + filter->len); | |
2160 | if (!filter_a) { | |
2161 | free(filter_expression_a); | |
2162 | ret = LTTNG_ERR_FATAL; | |
2163 | goto error; | |
2164 | } | |
2165 | memcpy(filter_a, filter, sizeof(*filter_a) + filter->len); | |
2166 | } | |
29c62722 | 2167 | event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */ |
00a62084 MD |
2168 | ret = event_kernel_enable_event(kchan, event, |
2169 | filter_expression, filter); | |
a969e101 MD |
2170 | /* We have passed ownership */ |
2171 | filter_expression = NULL; | |
2172 | filter = NULL; | |
29c62722 MD |
2173 | if (ret != LTTNG_OK) { |
2174 | if (channel_created) { | |
2175 | /* Let's not leak a useless channel. */ | |
2176 | kernel_destroy_channel(kchan); | |
2177 | } | |
00a62084 MD |
2178 | free(filter_expression_a); |
2179 | free(filter_a); | |
29c62722 MD |
2180 | goto error; |
2181 | } | |
2182 | event->type = LTTNG_EVENT_SYSCALL; /* Hack */ | |
00a62084 MD |
2183 | ret = event_kernel_enable_event(kchan, event, |
2184 | filter_expression_a, filter_a); | |
60d21fa2 AB |
2185 | /* We have passed ownership */ |
2186 | filter_expression_a = NULL; | |
2187 | filter_a = NULL; | |
29c62722 MD |
2188 | if (ret != LTTNG_OK) { |
2189 | goto error; | |
2190 | } | |
2191 | break; | |
2192 | } | |
6e6ef3d7 | 2193 | case LTTNG_EVENT_PROBE: |
dcabc190 | 2194 | case LTTNG_EVENT_USERSPACE_PROBE: |
6e6ef3d7 DG |
2195 | case LTTNG_EVENT_FUNCTION: |
2196 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
6e911cad | 2197 | case LTTNG_EVENT_TRACEPOINT: |
00a62084 MD |
2198 | ret = event_kernel_enable_event(kchan, event, |
2199 | filter_expression, filter); | |
a969e101 MD |
2200 | /* We have passed ownership */ |
2201 | filter_expression = NULL; | |
2202 | filter = NULL; | |
6e911cad MD |
2203 | if (ret != LTTNG_OK) { |
2204 | if (channel_created) { | |
2205 | /* Let's not leak a useless channel. */ | |
2206 | kernel_destroy_channel(kchan); | |
2207 | } | |
2208 | goto error; | |
e5f5db7f | 2209 | } |
6e911cad MD |
2210 | break; |
2211 | case LTTNG_EVENT_SYSCALL: | |
00a62084 MD |
2212 | ret = event_kernel_enable_event(kchan, event, |
2213 | filter_expression, filter); | |
a969e101 MD |
2214 | /* We have passed ownership */ |
2215 | filter_expression = NULL; | |
2216 | filter = NULL; | |
e2b957af MD |
2217 | if (ret != LTTNG_OK) { |
2218 | goto error; | |
2219 | } | |
6e911cad MD |
2220 | break; |
2221 | default: | |
2222 | ret = LTTNG_ERR_UNK; | |
2f77fc4b DG |
2223 | goto error; |
2224 | } | |
2225 | ||
7d268848 | 2226 | kernel_wait_quiescent(); |
2f77fc4b DG |
2227 | break; |
2228 | } | |
2229 | case LTTNG_DOMAIN_UST: | |
2230 | { | |
2231 | struct ltt_ust_channel *uchan; | |
2232 | struct ltt_ust_session *usess = session->ust_session; | |
2233 | ||
2234 | assert(usess); | |
2235 | ||
85076754 MD |
2236 | /* |
2237 | * If a non-default channel has been created in the | |
2238 | * session, explicitely require that -c chan_name needs | |
2239 | * to be provided. | |
2240 | */ | |
2241 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
2242 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
2243 | goto error; | |
2244 | } | |
2245 | ||
2f77fc4b DG |
2246 | /* Get channel from global UST domain */ |
2247 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2248 | channel_name); | |
2249 | if (uchan == NULL) { | |
2250 | /* Create default channel */ | |
0a9c6494 DG |
2251 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
2252 | usess->buffer_type); | |
2f77fc4b | 2253 | if (attr == NULL) { |
f73fabfd | 2254 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2255 | goto error; |
2256 | } | |
04c17253 MD |
2257 | if (lttng_strncpy(attr->name, channel_name, |
2258 | sizeof(attr->name))) { | |
2259 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
2260 | goto error; |
2261 | } | |
2f77fc4b DG |
2262 | |
2263 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 2264 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2265 | goto error; |
2266 | } | |
2f77fc4b DG |
2267 | |
2268 | /* Get the newly created channel reference back */ | |
2269 | uchan = trace_ust_find_channel_by_name( | |
2270 | usess->domain_global.channels, channel_name); | |
2271 | assert(uchan); | |
2272 | } | |
2273 | ||
141feb8c JG |
2274 | if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) { |
2275 | /* | |
2276 | * Don't allow users to add UST events to channels which | |
2277 | * are assigned to a userspace subdomain (JUL, Log4J, | |
2278 | * Python, etc.). | |
2279 | */ | |
2280 | ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN; | |
2281 | goto error; | |
2282 | } | |
2283 | ||
dac8e046 JG |
2284 | if (!internal_event) { |
2285 | /* | |
2286 | * Ensure the event name is not reserved for internal | |
2287 | * use. | |
2288 | */ | |
2289 | ret = validate_ust_event_name(event->name); | |
2290 | if (ret) { | |
2291 | WARN("Userspace event name %s failed validation.", | |
bbcab087 | 2292 | event->name); |
dac8e046 JG |
2293 | ret = LTTNG_ERR_INVALID_EVENT_NAME; |
2294 | goto error; | |
2295 | } | |
2296 | } | |
2297 | ||
2f77fc4b | 2298 | /* At this point, the session and channel exist on the tracer */ |
6b453b5e | 2299 | ret = event_ust_enable_tracepoint(usess, uchan, event, |
88f06f15 JG |
2300 | filter_expression, filter, exclusion, |
2301 | internal_event); | |
49d21f93 MD |
2302 | /* We have passed ownership */ |
2303 | filter_expression = NULL; | |
2304 | filter = NULL; | |
2305 | exclusion = NULL; | |
94382e15 JG |
2306 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2307 | goto already_enabled; | |
2308 | } else if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2309 | goto error; |
2310 | } | |
2311 | break; | |
2312 | } | |
5cdb6027 | 2313 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 2314 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2315 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 2316 | { |
da6c3a50 | 2317 | const char *default_event_name, *default_chan_name; |
fefd409b | 2318 | struct agent *agt; |
f20baf8e DG |
2319 | struct lttng_event uevent; |
2320 | struct lttng_domain tmp_dom; | |
2321 | struct ltt_ust_session *usess = session->ust_session; | |
2322 | ||
2323 | assert(usess); | |
2324 | ||
f28f9e44 JG |
2325 | if (!agent_tracing_is_enabled()) { |
2326 | DBG("Attempted to enable an event in an agent domain but the agent thread is not running"); | |
2327 | ret = LTTNG_ERR_AGENT_TRACING_DISABLED; | |
2328 | goto error; | |
2329 | } | |
2330 | ||
5cdb6027 | 2331 | agt = trace_ust_find_agent(usess, domain->type); |
fefd409b | 2332 | if (!agt) { |
5cdb6027 | 2333 | agt = agent_create(domain->type); |
fefd409b | 2334 | if (!agt) { |
e5b3c48c | 2335 | ret = LTTNG_ERR_NOMEM; |
fefd409b DG |
2336 | goto error; |
2337 | } | |
2338 | agent_add(agt, usess->agents); | |
2339 | } | |
2340 | ||
022d91ba | 2341 | /* Create the default tracepoint. */ |
996de3c7 | 2342 | memset(&uevent, 0, sizeof(uevent)); |
f20baf8e DG |
2343 | uevent.type = LTTNG_EVENT_TRACEPOINT; |
2344 | uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
51755dc8 JG |
2345 | default_event_name = event_get_default_agent_ust_name( |
2346 | domain->type); | |
da6c3a50 | 2347 | if (!default_event_name) { |
e5b3c48c | 2348 | ret = LTTNG_ERR_FATAL; |
da6c3a50 | 2349 | goto error; |
f43f95a9 | 2350 | } |
da6c3a50 | 2351 | strncpy(uevent.name, default_event_name, sizeof(uevent.name)); |
f20baf8e DG |
2352 | uevent.name[sizeof(uevent.name) - 1] = '\0'; |
2353 | ||
2354 | /* | |
2355 | * The domain type is changed because we are about to enable the | |
2356 | * default channel and event for the JUL domain that are hardcoded. | |
2357 | * This happens in the UST domain. | |
2358 | */ | |
2359 | memcpy(&tmp_dom, domain, sizeof(tmp_dom)); | |
2360 | tmp_dom.type = LTTNG_DOMAIN_UST; | |
2361 | ||
0e115563 DG |
2362 | switch (domain->type) { |
2363 | case LTTNG_DOMAIN_LOG4J: | |
da6c3a50 | 2364 | default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME; |
0e115563 DG |
2365 | break; |
2366 | case LTTNG_DOMAIN_JUL: | |
da6c3a50 | 2367 | default_chan_name = DEFAULT_JUL_CHANNEL_NAME; |
0e115563 DG |
2368 | break; |
2369 | case LTTNG_DOMAIN_PYTHON: | |
2370 | default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
2371 | break; | |
2372 | default: | |
e98a44b0 | 2373 | /* The switch/case we are in makes this impossible */ |
0e115563 | 2374 | assert(0); |
da6c3a50 DG |
2375 | } |
2376 | ||
971da06a | 2377 | { |
8404118c | 2378 | char *filter_expression_copy = NULL; |
51755dc8 | 2379 | struct lttng_filter_bytecode *filter_copy = NULL; |
971da06a JG |
2380 | |
2381 | if (filter) { | |
51755dc8 JG |
2382 | const size_t filter_size = sizeof( |
2383 | struct lttng_filter_bytecode) | |
2384 | + filter->len; | |
2385 | ||
2386 | filter_copy = zmalloc(filter_size); | |
971da06a | 2387 | if (!filter_copy) { |
018096a4 | 2388 | ret = LTTNG_ERR_NOMEM; |
b742e3e2 | 2389 | goto error; |
971da06a | 2390 | } |
51755dc8 | 2391 | memcpy(filter_copy, filter, filter_size); |
971da06a | 2392 | |
8404118c JG |
2393 | filter_expression_copy = |
2394 | strdup(filter_expression); | |
2395 | if (!filter_expression) { | |
2396 | ret = LTTNG_ERR_NOMEM; | |
51755dc8 JG |
2397 | } |
2398 | ||
2399 | if (!filter_expression_copy || !filter_copy) { | |
2400 | free(filter_expression_copy); | |
2401 | free(filter_copy); | |
2402 | goto error; | |
8404118c | 2403 | } |
971da06a JG |
2404 | } |
2405 | ||
88f06f15 | 2406 | ret = cmd_enable_event_internal(session, &tmp_dom, |
971da06a | 2407 | (char *) default_chan_name, |
8404118c JG |
2408 | &uevent, filter_expression_copy, |
2409 | filter_copy, NULL, wpipe); | |
971da06a JG |
2410 | } |
2411 | ||
94382e15 JG |
2412 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2413 | goto already_enabled; | |
2414 | } else if (ret != LTTNG_OK) { | |
f20baf8e DG |
2415 | goto error; |
2416 | } | |
2417 | ||
2418 | /* The wild card * means that everything should be enabled. */ | |
2419 | if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) { | |
8404118c JG |
2420 | ret = event_agent_enable_all(usess, agt, event, filter, |
2421 | filter_expression); | |
f20baf8e | 2422 | } else { |
8404118c JG |
2423 | ret = event_agent_enable(usess, agt, event, filter, |
2424 | filter_expression); | |
f20baf8e | 2425 | } |
51755dc8 JG |
2426 | filter = NULL; |
2427 | filter_expression = NULL; | |
f20baf8e DG |
2428 | if (ret != LTTNG_OK) { |
2429 | goto error; | |
2430 | } | |
2431 | ||
2432 | break; | |
2433 | } | |
2f77fc4b | 2434 | default: |
f73fabfd | 2435 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2436 | goto error; |
2437 | } | |
2438 | ||
f73fabfd | 2439 | ret = LTTNG_OK; |
2f77fc4b | 2440 | |
94382e15 | 2441 | already_enabled: |
2f77fc4b | 2442 | error: |
49d21f93 MD |
2443 | free(filter_expression); |
2444 | free(filter); | |
2445 | free(exclusion); | |
cf0bcb51 | 2446 | channel_attr_destroy(attr); |
2223c96f | 2447 | rcu_read_unlock(); |
2f77fc4b DG |
2448 | return ret; |
2449 | } | |
2450 | ||
88f06f15 JG |
2451 | /* |
2452 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2453 | * We own filter, exclusion, and filter_expression. | |
2454 | */ | |
df4f5a87 JG |
2455 | int cmd_enable_event(struct ltt_session *session, |
2456 | const struct lttng_domain *domain, | |
88f06f15 JG |
2457 | char *channel_name, struct lttng_event *event, |
2458 | char *filter_expression, | |
2459 | struct lttng_filter_bytecode *filter, | |
2460 | struct lttng_event_exclusion *exclusion, | |
2461 | int wpipe) | |
2462 | { | |
2463 | return _cmd_enable_event(session, domain, channel_name, event, | |
2464 | filter_expression, filter, exclusion, wpipe, false); | |
2465 | } | |
2466 | ||
2467 | /* | |
2468 | * Enable an event which is internal to LTTng. An internal should | |
2469 | * never be made visible to clients and are immune to checks such as | |
2470 | * reserved names. | |
2471 | */ | |
2472 | static int cmd_enable_event_internal(struct ltt_session *session, | |
df4f5a87 | 2473 | const struct lttng_domain *domain, |
88f06f15 JG |
2474 | char *channel_name, struct lttng_event *event, |
2475 | char *filter_expression, | |
2476 | struct lttng_filter_bytecode *filter, | |
2477 | struct lttng_event_exclusion *exclusion, | |
2478 | int wpipe) | |
2479 | { | |
2480 | return _cmd_enable_event(session, domain, channel_name, event, | |
2481 | filter_expression, filter, exclusion, wpipe, true); | |
2482 | } | |
2483 | ||
2f77fc4b DG |
2484 | /* |
2485 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2486 | */ | |
56a37563 JG |
2487 | ssize_t cmd_list_tracepoints(enum lttng_domain_type domain, |
2488 | struct lttng_event **events) | |
2f77fc4b DG |
2489 | { |
2490 | int ret; | |
2491 | ssize_t nb_events = 0; | |
2492 | ||
2493 | switch (domain) { | |
2494 | case LTTNG_DOMAIN_KERNEL: | |
7d268848 | 2495 | nb_events = kernel_list_events(events); |
2f77fc4b | 2496 | if (nb_events < 0) { |
f73fabfd | 2497 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
2f77fc4b DG |
2498 | goto error; |
2499 | } | |
2500 | break; | |
2501 | case LTTNG_DOMAIN_UST: | |
2502 | nb_events = ust_app_list_events(events); | |
2503 | if (nb_events < 0) { | |
f73fabfd | 2504 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2505 | goto error; |
2506 | } | |
2507 | break; | |
5cdb6027 | 2508 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2509 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2510 | case LTTNG_DOMAIN_PYTHON: |
f60140a1 | 2511 | nb_events = agent_list_events(events, domain); |
3c6a091f DG |
2512 | if (nb_events < 0) { |
2513 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2514 | goto error; | |
2515 | } | |
2516 | break; | |
2f77fc4b | 2517 | default: |
f73fabfd | 2518 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2519 | goto error; |
2520 | } | |
2521 | ||
2522 | return nb_events; | |
2523 | ||
2524 | error: | |
2525 | /* Return negative value to differentiate return code */ | |
2526 | return -ret; | |
2527 | } | |
2528 | ||
2529 | /* | |
2530 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
2531 | */ | |
56a37563 | 2532 | ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain, |
2f77fc4b DG |
2533 | struct lttng_event_field **fields) |
2534 | { | |
2535 | int ret; | |
2536 | ssize_t nb_fields = 0; | |
2537 | ||
2538 | switch (domain) { | |
2539 | case LTTNG_DOMAIN_UST: | |
2540 | nb_fields = ust_app_list_event_fields(fields); | |
2541 | if (nb_fields < 0) { | |
f73fabfd | 2542 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2543 | goto error; |
2544 | } | |
2545 | break; | |
2546 | case LTTNG_DOMAIN_KERNEL: | |
2547 | default: /* fall-through */ | |
f73fabfd | 2548 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2549 | goto error; |
2550 | } | |
2551 | ||
2552 | return nb_fields; | |
2553 | ||
2554 | error: | |
2555 | /* Return negative value to differentiate return code */ | |
2556 | return -ret; | |
2557 | } | |
2558 | ||
834978fd DG |
2559 | ssize_t cmd_list_syscalls(struct lttng_event **events) |
2560 | { | |
2561 | return syscall_table_list(events); | |
2562 | } | |
2563 | ||
2f77fc4b DG |
2564 | /* |
2565 | * Command LTTNG_START_TRACE processed by the client thread. | |
a9ad0c8f MD |
2566 | * |
2567 | * Called with session mutex held. | |
2f77fc4b DG |
2568 | */ |
2569 | int cmd_start_trace(struct ltt_session *session) | |
2570 | { | |
82b69413 | 2571 | enum lttng_error_code ret; |
cde3e505 | 2572 | unsigned long nb_chan = 0; |
2f77fc4b DG |
2573 | struct ltt_kernel_session *ksession; |
2574 | struct ltt_ust_session *usess; | |
1f496244 JG |
2575 | const bool session_rotated_after_last_stop = |
2576 | session->rotated_after_last_stop; | |
b02f5986 MD |
2577 | const bool session_cleared_after_last_stop = |
2578 | session->cleared_after_last_stop; | |
2f77fc4b DG |
2579 | |
2580 | assert(session); | |
2581 | ||
2582 | /* Ease our life a bit ;) */ | |
2583 | ksession = session->kernel_session; | |
2584 | usess = session->ust_session; | |
2585 | ||
8382cf6f DG |
2586 | /* Is the session already started? */ |
2587 | if (session->active) { | |
f73fabfd | 2588 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
7a24ece3 JR |
2589 | /* Perform nothing */ |
2590 | goto end; | |
2f77fc4b DG |
2591 | } |
2592 | ||
1f496244 JG |
2593 | if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING && |
2594 | !session->current_trace_chunk) { | |
2595 | /* | |
2596 | * A rotation was launched while the session was stopped and | |
2597 | * it has not been completed yet. It is not possible to start | |
2598 | * the session since starting the session here would require a | |
2599 | * rotation from "NULL" to a new trace chunk. That rotation | |
2600 | * would overlap with the ongoing rotation, which is not | |
2601 | * supported. | |
2602 | */ | |
2603 | WARN("Refusing to start session \"%s\" as a rotation launched after the last \"stop\" is still ongoing", | |
2604 | session->name); | |
2605 | ret = LTTNG_ERR_ROTATION_PENDING; | |
2606 | goto error; | |
2607 | } | |
2608 | ||
cde3e505 DG |
2609 | /* |
2610 | * Starting a session without channel is useless since after that it's not | |
2611 | * possible to enable channel thus inform the client. | |
2612 | */ | |
2613 | if (usess && usess->domain_global.channels) { | |
2614 | nb_chan += lttng_ht_get_count(usess->domain_global.channels); | |
2615 | } | |
2616 | if (ksession) { | |
2617 | nb_chan += ksession->channel_count; | |
2618 | } | |
2619 | if (!nb_chan) { | |
2620 | ret = LTTNG_ERR_NO_CHANNEL; | |
2621 | goto error; | |
2622 | } | |
2623 | ||
1f496244 JG |
2624 | session->active = 1; |
2625 | session->rotated_after_last_stop = false; | |
b02f5986 | 2626 | session->cleared_after_last_stop = false; |
070b6a86 | 2627 | if (session->output_traces && !session->current_trace_chunk) { |
1f496244 JG |
2628 | if (!session->has_been_started) { |
2629 | struct lttng_trace_chunk *trace_chunk; | |
2630 | ||
2631 | DBG("Creating initial trace chunk of session \"%s\"", | |
2632 | session->name); | |
2633 | trace_chunk = session_create_new_trace_chunk( | |
2634 | session, NULL, NULL, NULL); | |
2635 | if (!trace_chunk) { | |
2636 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
2637 | goto error; | |
2638 | } | |
2639 | assert(!session->current_trace_chunk); | |
2640 | ret = session_set_trace_chunk(session, trace_chunk, | |
2641 | NULL); | |
2642 | lttng_trace_chunk_put(trace_chunk); | |
2643 | if (ret) { | |
2644 | ret = LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER; | |
2645 | goto error; | |
2646 | } | |
2647 | } else { | |
2648 | DBG("Rotating session \"%s\" from its current \"NULL\" trace chunk to a new chunk", | |
2649 | session->name); | |
2650 | /* | |
2651 | * Rotate existing streams into the new chunk. | |
2652 | * This is a "quiet" rotation has no client has | |
2653 | * explicitly requested this operation. | |
2654 | * | |
2655 | * There is also no need to wait for the rotation | |
2656 | * to complete as it will happen immediately. No data | |
2657 | * was produced as the session was stopped, so the | |
2658 | * rotation should happen on reception of the command. | |
2659 | */ | |
343defc2 MD |
2660 | ret = cmd_rotate_session(session, NULL, true, |
2661 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION); | |
1f496244 JG |
2662 | if (ret != LTTNG_OK) { |
2663 | goto error; | |
2664 | } | |
5c408ad8 | 2665 | } |
c996624c JD |
2666 | } |
2667 | ||
2f77fc4b DG |
2668 | /* Kernel tracing */ |
2669 | if (ksession != NULL) { | |
c996624c | 2670 | DBG("Start kernel tracing session %s", session->name); |
7d268848 | 2671 | ret = start_kernel_session(ksession); |
9b6c7ec5 | 2672 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2673 | goto error; |
2674 | } | |
2f77fc4b DG |
2675 | } |
2676 | ||
2677 | /* Flag session that trace should start automatically */ | |
2678 | if (usess) { | |
82b69413 JG |
2679 | int int_ret = ust_app_start_trace_all(usess); |
2680 | ||
2681 | if (int_ret < 0) { | |
f73fabfd | 2682 | ret = LTTNG_ERR_UST_START_FAIL; |
2f77fc4b DG |
2683 | goto error; |
2684 | } | |
2685 | } | |
2686 | ||
04ed9e10 JG |
2687 | /* |
2688 | * Open a packet in every stream of the session to ensure that viewers | |
2689 | * can correctly identify the boundaries of the periods during which | |
2690 | * tracing was active for this session. | |
2691 | */ | |
2692 | ret = session_open_packets(session); | |
2693 | if (ret != LTTNG_OK) { | |
2694 | goto error; | |
2695 | } | |
2696 | ||
5c408ad8 JD |
2697 | /* |
2698 | * Clear the flag that indicates that a rotation was done while the | |
2699 | * session was stopped. | |
2700 | */ | |
2701 | session->rotated_after_last_stop = false; | |
2702 | ||
259c2674 | 2703 | if (session->rotate_timer_period) { |
82b69413 JG |
2704 | int int_ret = timer_session_rotation_schedule_timer_start( |
2705 | session, session->rotate_timer_period); | |
2706 | ||
2707 | if (int_ret < 0) { | |
259c2674 JD |
2708 | ERR("Failed to enable rotate timer"); |
2709 | ret = LTTNG_ERR_UNK; | |
2710 | goto error; | |
2711 | } | |
2712 | } | |
2713 | ||
f73fabfd | 2714 | ret = LTTNG_OK; |
2f77fc4b DG |
2715 | |
2716 | error: | |
1f496244 JG |
2717 | if (ret == LTTNG_OK) { |
2718 | /* Flag this after a successful start. */ | |
2719 | session->has_been_started |= 1; | |
2720 | } else { | |
2721 | session->active = 0; | |
2722 | /* Restore initial state on error. */ | |
2723 | session->rotated_after_last_stop = | |
2724 | session_rotated_after_last_stop; | |
b02f5986 MD |
2725 | session->cleared_after_last_stop = |
2726 | session_cleared_after_last_stop; | |
1f496244 | 2727 | } |
7a24ece3 | 2728 | end: |
2f77fc4b DG |
2729 | return ret; |
2730 | } | |
2731 | ||
2732 | /* | |
2733 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2734 | */ | |
2735 | int cmd_stop_trace(struct ltt_session *session) | |
2736 | { | |
2737 | int ret; | |
2f77fc4b DG |
2738 | struct ltt_kernel_session *ksession; |
2739 | struct ltt_ust_session *usess; | |
2740 | ||
2741 | assert(session); | |
2742 | ||
4dbe1875 | 2743 | DBG("Begin stop session \"%s\" (id %" PRIu64 ")", session->name, session->id); |
2f77fc4b DG |
2744 | /* Short cut */ |
2745 | ksession = session->kernel_session; | |
2746 | usess = session->ust_session; | |
2747 | ||
8382cf6f DG |
2748 | /* Session is not active. Skip everythong and inform the client. */ |
2749 | if (!session->active) { | |
f73fabfd | 2750 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
2f77fc4b DG |
2751 | goto error; |
2752 | } | |
2753 | ||
4dbe1875 MD |
2754 | ret = stop_kernel_session(ksession); |
2755 | if (ret != LTTNG_OK) { | |
2756 | goto error; | |
2f77fc4b DG |
2757 | } |
2758 | ||
14fb1ebe | 2759 | if (usess && usess->active) { |
2f77fc4b DG |
2760 | ret = ust_app_stop_trace_all(usess); |
2761 | if (ret < 0) { | |
f73fabfd | 2762 | ret = LTTNG_ERR_UST_STOP_FAIL; |
2f77fc4b DG |
2763 | goto error; |
2764 | } | |
2765 | } | |
2766 | ||
4dbe1875 MD |
2767 | DBG("Completed stop session \"%s\" (id %" PRIu64 ")", session->name, |
2768 | session->id); | |
8382cf6f DG |
2769 | /* Flag inactive after a successful stop. */ |
2770 | session->active = 0; | |
4dbe1875 | 2771 | ret = LTTNG_OK; |
2f77fc4b DG |
2772 | |
2773 | error: | |
2774 | return ret; | |
2775 | } | |
2776 | ||
2777 | /* | |
433f5ba9 JR |
2778 | * Set the base_path of the session only if subdir of a control uris is set. |
2779 | * Return LTTNG_OK on success, otherwise LTTNG_ERR_*. | |
2f77fc4b | 2780 | */ |
433f5ba9 JR |
2781 | static int set_session_base_path_from_uris(struct ltt_session *session, |
2782 | size_t nb_uri, | |
bda32d56 | 2783 | struct lttng_uri *uris) |
2f77fc4b | 2784 | { |
433f5ba9 JR |
2785 | int ret; |
2786 | size_t i; | |
2f77fc4b | 2787 | |
e3876bf0 JR |
2788 | for (i = 0; i < nb_uri; i++) { |
2789 | if (uris[i].stype != LTTNG_STREAM_CONTROL || | |
2790 | uris[i].subdir[0] == '\0') { | |
2791 | /* Not interested in these URIs */ | |
2792 | continue; | |
2793 | } | |
2794 | ||
2795 | if (session->base_path != NULL) { | |
2796 | free(session->base_path); | |
2797 | session->base_path = NULL; | |
2798 | } | |
2799 | ||
2800 | /* Set session base_path */ | |
2801 | session->base_path = strdup(uris[i].subdir); | |
2802 | if (!session->base_path) { | |
433f5ba9 JR |
2803 | PERROR("Failed to copy base path \"%s\" to session \"%s\"", |
2804 | uris[i].subdir, session->name); | |
2805 | ret = LTTNG_ERR_NOMEM; | |
e3876bf0 JR |
2806 | goto error; |
2807 | } | |
433f5ba9 JR |
2808 | DBG2("Setting base path \"%s\" for session \"%s\"", |
2809 | session->base_path, session->name); | |
2810 | } | |
2811 | ret = LTTNG_OK; | |
2812 | error: | |
2813 | return ret; | |
2814 | } | |
2815 | ||
2816 | /* | |
2817 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
2818 | */ | |
2819 | int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri, | |
2820 | struct lttng_uri *uris) | |
2821 | { | |
2822 | int ret, i; | |
2823 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2824 | struct ltt_ust_session *usess = session->ust_session; | |
2825 | ||
2826 | assert(session); | |
2827 | assert(uris); | |
2828 | assert(nb_uri > 0); | |
2829 | ||
2830 | /* Can't set consumer URI if the session is active. */ | |
2831 | if (session->active) { | |
2832 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; | |
2833 | goto error; | |
2834 | } | |
2835 | ||
2836 | /* | |
2837 | * Set the session base path if any. This is done inside | |
2838 | * cmd_set_consumer_uri to preserve backward compatibility of the | |
2839 | * previous session creation api vs the session descriptor api. | |
2840 | */ | |
2841 | ret = set_session_base_path_from_uris(session, nb_uri, uris); | |
2842 | if (ret != LTTNG_OK) { | |
2843 | goto error; | |
e3876bf0 JR |
2844 | } |
2845 | ||
bda32d56 | 2846 | /* Set the "global" consumer URIs */ |
2f77fc4b | 2847 | for (i = 0; i < nb_uri; i++) { |
e3876bf0 JR |
2848 | ret = add_uri_to_consumer(session, session->consumer, &uris[i], |
2849 | LTTNG_DOMAIN_NONE); | |
a74934ba | 2850 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2851 | goto error; |
2852 | } | |
2f77fc4b DG |
2853 | } |
2854 | ||
bda32d56 JG |
2855 | /* Set UST session URIs */ |
2856 | if (session->ust_session) { | |
2857 | for (i = 0; i < nb_uri; i++) { | |
b178f53e | 2858 | ret = add_uri_to_consumer(session, |
bda32d56 | 2859 | session->ust_session->consumer, |
b178f53e | 2860 | &uris[i], LTTNG_DOMAIN_UST); |
bda32d56 JG |
2861 | if (ret != LTTNG_OK) { |
2862 | goto error; | |
2863 | } | |
2864 | } | |
2865 | } | |
2866 | ||
2867 | /* Set kernel session URIs */ | |
2868 | if (session->kernel_session) { | |
2869 | for (i = 0; i < nb_uri; i++) { | |
b178f53e | 2870 | ret = add_uri_to_consumer(session, |
bda32d56 | 2871 | session->kernel_session->consumer, |
b178f53e | 2872 | &uris[i], LTTNG_DOMAIN_KERNEL); |
bda32d56 JG |
2873 | if (ret != LTTNG_OK) { |
2874 | goto error; | |
2875 | } | |
2876 | } | |
2877 | } | |
2878 | ||
7ab70fe0 DG |
2879 | /* |
2880 | * Make sure to set the session in output mode after we set URI since a | |
2881 | * session can be created without URL (thus flagged in no output mode). | |
2882 | */ | |
2883 | session->output_traces = 1; | |
2884 | if (ksess) { | |
2885 | ksess->output_traces = 1; | |
bda32d56 JG |
2886 | } |
2887 | ||
2888 | if (usess) { | |
7ab70fe0 DG |
2889 | usess->output_traces = 1; |
2890 | } | |
2891 | ||
2f77fc4b | 2892 | /* All good! */ |
f73fabfd | 2893 | ret = LTTNG_OK; |
2f77fc4b DG |
2894 | |
2895 | error: | |
2896 | return ret; | |
2897 | } | |
2898 | ||
b178f53e JG |
2899 | static |
2900 | enum lttng_error_code set_session_output_from_descriptor( | |
2901 | struct ltt_session *session, | |
2902 | const struct lttng_session_descriptor *descriptor) | |
2f77fc4b DG |
2903 | { |
2904 | int ret; | |
b178f53e JG |
2905 | enum lttng_error_code ret_code = LTTNG_OK; |
2906 | enum lttng_session_descriptor_type session_type = | |
2907 | lttng_session_descriptor_get_type(descriptor); | |
2908 | enum lttng_session_descriptor_output_type output_type = | |
2909 | lttng_session_descriptor_get_output_type(descriptor); | |
2910 | struct lttng_uri uris[2] = {}; | |
2911 | size_t uri_count = 0; | |
2912 | ||
2913 | switch (output_type) { | |
2914 | case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NONE: | |
2915 | goto end; | |
2916 | case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_LOCAL: | |
2917 | lttng_session_descriptor_get_local_output_uri(descriptor, | |
2918 | &uris[0]); | |
2919 | uri_count = 1; | |
2920 | break; | |
2921 | case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NETWORK: | |
2922 | lttng_session_descriptor_get_network_output_uris(descriptor, | |
2923 | &uris[0], &uris[1]); | |
2924 | uri_count = 2; | |
2925 | break; | |
2926 | default: | |
2927 | ret_code = LTTNG_ERR_INVALID; | |
e32d7f27 | 2928 | goto end; |
2f77fc4b DG |
2929 | } |
2930 | ||
b178f53e JG |
2931 | switch (session_type) { |
2932 | case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT: | |
2933 | { | |
2934 | struct snapshot_output *new_output = NULL; | |
2935 | ||
2936 | new_output = snapshot_output_alloc(); | |
2937 | if (!new_output) { | |
2938 | ret_code = LTTNG_ERR_NOMEM; | |
2939 | goto end; | |
2940 | } | |
2941 | ||
2942 | ret = snapshot_output_init_with_uri(session, | |
2943 | DEFAULT_SNAPSHOT_MAX_SIZE, | |
2944 | NULL, uris, uri_count, session->consumer, | |
2945 | new_output, &session->snapshot); | |
2946 | if (ret < 0) { | |
2947 | ret_code = (ret == -ENOMEM) ? | |
2948 | LTTNG_ERR_NOMEM : LTTNG_ERR_INVALID; | |
2949 | snapshot_output_destroy(new_output); | |
2950 | goto end; | |
2951 | } | |
2952 | snapshot_add_output(&session->snapshot, new_output); | |
2953 | break; | |
2954 | } | |
2955 | case LTTNG_SESSION_DESCRIPTOR_TYPE_REGULAR: | |
2956 | case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE: | |
2957 | { | |
2958 | ret_code = cmd_set_consumer_uri(session, uri_count, uris); | |
2959 | break; | |
2960 | } | |
2961 | default: | |
2962 | ret_code = LTTNG_ERR_INVALID; | |
e32d7f27 | 2963 | goto end; |
2f77fc4b | 2964 | } |
b178f53e JG |
2965 | end: |
2966 | return ret_code; | |
2967 | } | |
2968 | ||
2969 | static | |
2970 | enum lttng_error_code cmd_create_session_from_descriptor( | |
2971 | struct lttng_session_descriptor *descriptor, | |
2972 | const lttng_sock_cred *creds, | |
2973 | const char *home_path) | |
2974 | { | |
2975 | int ret; | |
2976 | enum lttng_error_code ret_code; | |
2977 | const char *session_name; | |
2978 | struct ltt_session *new_session = NULL; | |
2979 | enum lttng_session_descriptor_status descriptor_status; | |
2f77fc4b | 2980 | |
e32d7f27 | 2981 | session_lock_list(); |
b178f53e JG |
2982 | if (home_path) { |
2983 | if (*home_path != '/') { | |
2984 | ERR("Home path provided by client is not absolute"); | |
2985 | ret_code = LTTNG_ERR_INVALID; | |
2986 | goto end; | |
2987 | } | |
2988 | } | |
2f77fc4b | 2989 | |
b178f53e JG |
2990 | descriptor_status = lttng_session_descriptor_get_session_name( |
2991 | descriptor, &session_name); | |
2992 | switch (descriptor_status) { | |
2993 | case LTTNG_SESSION_DESCRIPTOR_STATUS_OK: | |
2994 | break; | |
2995 | case LTTNG_SESSION_DESCRIPTOR_STATUS_UNSET: | |
2996 | session_name = NULL; | |
2997 | break; | |
2998 | default: | |
2999 | ret_code = LTTNG_ERR_INVALID; | |
3000 | goto end; | |
3001 | } | |
e3876bf0 | 3002 | |
b178f53e | 3003 | ret_code = session_create(session_name, creds->uid, creds->gid, |
e3876bf0 | 3004 | &new_session); |
b178f53e | 3005 | if (ret_code != LTTNG_OK) { |
e32d7f27 | 3006 | goto end; |
2f77fc4b DG |
3007 | } |
3008 | ||
b178f53e JG |
3009 | if (!session_name) { |
3010 | ret = lttng_session_descriptor_set_session_name(descriptor, | |
3011 | new_session->name); | |
3012 | if (ret) { | |
3013 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
3014 | goto end; | |
3015 | } | |
3016 | } | |
3017 | ||
3018 | if (!lttng_session_descriptor_is_output_destination_initialized( | |
3019 | descriptor)) { | |
3020 | /* | |
3021 | * Only include the session's creation time in the output | |
3022 | * destination if the name of the session itself was | |
3023 | * not auto-generated. | |
3024 | */ | |
3025 | ret_code = lttng_session_descriptor_set_default_output( | |
3026 | descriptor, | |
3027 | session_name ? &new_session->creation_time : NULL, | |
3028 | home_path); | |
3029 | if (ret_code != LTTNG_OK) { | |
e32d7f27 | 3030 | goto end; |
2bba9e53 | 3031 | } |
2bba9e53 | 3032 | } else { |
b178f53e JG |
3033 | new_session->has_user_specified_directory = |
3034 | lttng_session_descriptor_has_output_directory( | |
3035 | descriptor); | |
2f77fc4b DG |
3036 | } |
3037 | ||
b178f53e JG |
3038 | switch (lttng_session_descriptor_get_type(descriptor)) { |
3039 | case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT: | |
3040 | new_session->snapshot_mode = 1; | |
3041 | break; | |
3042 | case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE: | |
3043 | new_session->live_timer = | |
3044 | lttng_session_descriptor_live_get_timer_interval( | |
3045 | descriptor); | |
3046 | break; | |
3047 | default: | |
3048 | break; | |
3049 | } | |
2f77fc4b | 3050 | |
b178f53e JG |
3051 | ret_code = set_session_output_from_descriptor(new_session, descriptor); |
3052 | if (ret_code != LTTNG_OK) { | |
3053 | goto end; | |
3054 | } | |
3055 | new_session->consumer->enabled = 1; | |
3056 | ret_code = LTTNG_OK; | |
e32d7f27 | 3057 | end: |
b178f53e JG |
3058 | /* Release reference provided by the session_create function. */ |
3059 | session_put(new_session); | |
3060 | if (ret_code != LTTNG_OK && new_session) { | |
3061 | /* Release the global reference on error. */ | |
3062 | session_destroy(new_session); | |
e32d7f27 | 3063 | } |
b178f53e JG |
3064 | session_unlock_list(); |
3065 | return ret_code; | |
2f77fc4b DG |
3066 | } |
3067 | ||
b178f53e JG |
3068 | enum lttng_error_code cmd_create_session(struct command_ctx *cmd_ctx, int sock, |
3069 | struct lttng_session_descriptor **return_descriptor) | |
27babd3a DG |
3070 | { |
3071 | int ret; | |
b178f53e JG |
3072 | size_t payload_size; |
3073 | struct lttng_dynamic_buffer payload; | |
3074 | struct lttng_buffer_view home_dir_view; | |
3075 | struct lttng_buffer_view session_descriptor_view; | |
3076 | struct lttng_session_descriptor *session_descriptor = NULL; | |
3077 | enum lttng_error_code ret_code; | |
3078 | ||
3079 | lttng_dynamic_buffer_init(&payload); | |
3a91de3a | 3080 | if (cmd_ctx->lsm.u.create_session.home_dir_size >= |
b178f53e JG |
3081 | LTTNG_PATH_MAX) { |
3082 | ret_code = LTTNG_ERR_INVALID; | |
3083 | goto error; | |
27babd3a | 3084 | } |
3a91de3a | 3085 | if (cmd_ctx->lsm.u.create_session.session_descriptor_size > |
b178f53e JG |
3086 | LTTNG_SESSION_DESCRIPTOR_MAX_LEN) { |
3087 | ret_code = LTTNG_ERR_INVALID; | |
3088 | goto error; | |
27babd3a DG |
3089 | } |
3090 | ||
3a91de3a JG |
3091 | payload_size = cmd_ctx->lsm.u.create_session.home_dir_size + |
3092 | cmd_ctx->lsm.u.create_session.session_descriptor_size; | |
b178f53e JG |
3093 | ret = lttng_dynamic_buffer_set_size(&payload, payload_size); |
3094 | if (ret) { | |
3095 | ret_code = LTTNG_ERR_NOMEM; | |
3096 | goto error; | |
27babd3a DG |
3097 | } |
3098 | ||
b178f53e JG |
3099 | ret = lttcomm_recv_unix_sock(sock, payload.data, payload.size); |
3100 | if (ret <= 0) { | |
3101 | ERR("Reception of session descriptor failed, aborting."); | |
3102 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
3103 | goto error; | |
27babd3a DG |
3104 | } |
3105 | ||
b178f53e JG |
3106 | home_dir_view = lttng_buffer_view_from_dynamic_buffer( |
3107 | &payload, | |
3108 | 0, | |
3a91de3a | 3109 | cmd_ctx->lsm.u.create_session.home_dir_size); |
b178f53e JG |
3110 | session_descriptor_view = lttng_buffer_view_from_dynamic_buffer( |
3111 | &payload, | |
3a91de3a JG |
3112 | cmd_ctx->lsm.u.create_session.home_dir_size, |
3113 | cmd_ctx->lsm.u.create_session.session_descriptor_size); | |
27babd3a | 3114 | |
b178f53e JG |
3115 | ret = lttng_session_descriptor_create_from_buffer( |
3116 | &session_descriptor_view, &session_descriptor); | |
3117 | if (ret < 0) { | |
3118 | ERR("Failed to create session descriptor from payload of \"create session\" command"); | |
3119 | ret_code = LTTNG_ERR_INVALID; | |
3120 | goto error; | |
3121 | } | |
27babd3a | 3122 | |
b178f53e JG |
3123 | /* |
3124 | * Sets the descriptor's auto-generated properties (name, output) if | |
3125 | * needed. | |
3126 | */ | |
3127 | ret_code = cmd_create_session_from_descriptor(session_descriptor, | |
3128 | &cmd_ctx->creds, | |
3129 | home_dir_view.size ? home_dir_view.data : NULL); | |
3130 | if (ret_code != LTTNG_OK) { | |
3131 | goto error; | |
e32d7f27 | 3132 | } |
b178f53e JG |
3133 | |
3134 | ret_code = LTTNG_OK; | |
3135 | *return_descriptor = session_descriptor; | |
3136 | session_descriptor = NULL; | |
3137 | error: | |
3138 | lttng_dynamic_buffer_reset(&payload); | |
3139 | lttng_session_descriptor_destroy(session_descriptor); | |
3140 | return ret_code; | |
27babd3a DG |
3141 | } |
3142 | ||
3e3665b8 JG |
3143 | static |
3144 | void cmd_destroy_session_reply(const struct ltt_session *session, | |
3145 | void *_reply_context) | |
3146 | { | |
3147 | int ret; | |
3148 | ssize_t comm_ret; | |
3149 | const struct cmd_destroy_session_reply_context *reply_context = | |
3150 | _reply_context; | |
3151 | struct lttng_dynamic_buffer payload; | |
3152 | struct lttcomm_session_destroy_command_header cmd_header; | |
3153 | struct lttng_trace_archive_location *location = NULL; | |
3154 | struct lttcomm_lttng_msg llm = { | |
3155 | .cmd_type = LTTNG_DESTROY_SESSION, | |
3285a971 | 3156 | .ret_code = reply_context->destruction_status, |
3e3665b8 JG |
3157 | .pid = UINT32_MAX, |
3158 | .cmd_header_size = | |
3159 | sizeof(struct lttcomm_session_destroy_command_header), | |
3160 | .data_size = 0, | |
3161 | }; | |
3162 | size_t payload_size_before_location; | |
3163 | ||
3164 | lttng_dynamic_buffer_init(&payload); | |
3165 | ||
3166 | ret = lttng_dynamic_buffer_append(&payload, &llm, sizeof(llm)); | |
3167 | if (ret) { | |
3168 | ERR("Failed to append session destruction message"); | |
3169 | goto error; | |
3170 | } | |
3171 | ||
3172 | cmd_header.rotation_state = | |
3173 | (int32_t) (reply_context->implicit_rotation_on_destroy ? | |
3174 | session->rotation_state : | |
3175 | LTTNG_ROTATION_STATE_NO_ROTATION); | |
3176 | ret = lttng_dynamic_buffer_append(&payload, &cmd_header, | |
3177 | sizeof(cmd_header)); | |
3178 | if (ret) { | |
3179 | ERR("Failed to append session destruction command header"); | |
3180 | goto error; | |
3181 | } | |
3182 | ||
3183 | if (!reply_context->implicit_rotation_on_destroy) { | |
3184 | DBG("No implicit rotation performed during the destruction of session \"%s\", sending reply", | |
3185 | session->name); | |
3186 | goto send_reply; | |
3187 | } | |
3188 | if (session->rotation_state != LTTNG_ROTATION_STATE_COMPLETED) { | |
3189 | DBG("Rotation state of session \"%s\" is not \"completed\", sending session destruction reply", | |
3190 | session->name); | |
3191 | goto send_reply; | |
3192 | } | |
3193 | ||
3194 | location = session_get_trace_archive_location(session); | |
3195 | if (!location) { | |
3196 | ERR("Failed to get the location of the trace archive produced during the destruction of session \"%s\"", | |
3197 | session->name); | |
3198 | goto error; | |
3199 | } | |
3200 | ||
3201 | payload_size_before_location = payload.size; | |
3202 | comm_ret = lttng_trace_archive_location_serialize(location, | |
3203 | &payload); | |
3204 | if (comm_ret < 0) { | |
3205 | ERR("Failed to serialize the location of the trace archive produced during the destruction of session \"%s\"", | |
3206 | session->name); | |
3207 | goto error; | |
3208 | } | |
3209 | /* Update the message to indicate the location's length. */ | |
3210 | ((struct lttcomm_lttng_msg *) payload.data)->data_size = | |
3211 | payload.size - payload_size_before_location; | |
3212 | send_reply: | |
3213 | comm_ret = lttcomm_send_unix_sock(reply_context->reply_sock_fd, | |
3214 | payload.data, payload.size); | |
3215 | if (comm_ret != (ssize_t) payload.size) { | |
3216 | ERR("Failed to send result of the destruction of session \"%s\" to client", | |
3217 | session->name); | |
3218 | } | |
3219 | error: | |
3220 | ret = close(reply_context->reply_sock_fd); | |
3221 | if (ret) { | |
3222 | PERROR("Failed to close client socket in deferred session destroy reply"); | |
3223 | } | |
3224 | lttng_dynamic_buffer_reset(&payload); | |
3225 | free(_reply_context); | |
3226 | } | |
3227 | ||
2f77fc4b DG |
3228 | /* |
3229 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
a9ad0c8f MD |
3230 | * |
3231 | * Called with session lock held. | |
2f77fc4b | 3232 | */ |
e32d7f27 | 3233 | int cmd_destroy_session(struct ltt_session *session, |
3e3665b8 JG |
3234 | struct notification_thread_handle *notification_thread_handle, |
3235 | int *sock_fd) | |
2f77fc4b DG |
3236 | { |
3237 | int ret; | |
3285a971 | 3238 | enum lttng_error_code destruction_last_error = LTTNG_OK; |
3e3665b8 JG |
3239 | struct cmd_destroy_session_reply_context *reply_context = NULL; |
3240 | ||
3241 | if (sock_fd) { | |
3242 | reply_context = zmalloc(sizeof(*reply_context)); | |
3243 | if (!reply_context) { | |
3244 | ret = LTTNG_ERR_NOMEM; | |
3245 | goto end; | |
3246 | } | |
3247 | reply_context->reply_sock_fd = *sock_fd; | |
3248 | } | |
2f77fc4b DG |
3249 | |
3250 | /* Safety net */ | |
3251 | assert(session); | |
3252 | ||
3e3665b8 JG |
3253 | DBG("Begin destroy session %s (id %" PRIu64 ")", session->name, |
3254 | session->id); | |
3255 | if (session->active) { | |
3256 | DBG("Session \"%s\" is active, attempting to stop it before destroying it", | |
3257 | session->name); | |
3258 | ret = cmd_stop_trace(session); | |
3259 | if (ret != LTTNG_OK && ret != LTTNG_ERR_TRACE_ALREADY_STOPPED) { | |
3260 | /* Carry on with the destruction of the session. */ | |
3261 | ERR("Failed to stop session \"%s\" as part of its destruction: %s", | |
3262 | session->name, lttng_strerror(-ret)); | |
3285a971 | 3263 | destruction_last_error = ret; |
3e3665b8 JG |
3264 | } |
3265 | } | |
5c408ad8 | 3266 | |
92816cc3 JG |
3267 | if (session->rotation_schedule_timer_enabled) { |
3268 | if (timer_session_rotation_schedule_timer_stop( | |
3269 | session)) { | |
3270 | ERR("Failed to stop the \"rotation schedule\" timer of session %s", | |
3271 | session->name); | |
3285a971 | 3272 | destruction_last_error = LTTNG_ERR_TIMER_STOP_ERROR; |
92816cc3 | 3273 | } |
259c2674 JD |
3274 | } |
3275 | ||
90936dcf JD |
3276 | if (session->rotate_size) { |
3277 | unsubscribe_session_consumed_size_rotation(session, notification_thread_handle); | |
3278 | session->rotate_size = 0; | |
3279 | } | |
3280 | ||
a7ceb342 | 3281 | if (session->rotated && session->current_trace_chunk && session->output_traces) { |
b5893d8e JG |
3282 | /* |
3283 | * Perform a last rotation on destruction if rotations have | |
3284 | * occurred during the session's lifetime. | |
3285 | */ | |
343defc2 MD |
3286 | ret = cmd_rotate_session(session, NULL, false, |
3287 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED); | |
d2956687 JG |
3288 | if (ret != LTTNG_OK) { |
3289 | ERR("Failed to perform an implicit rotation as part of the destruction of session \"%s\": %s", | |
3290 | session->name, lttng_strerror(-ret)); | |
3285a971 | 3291 | destruction_last_error = -ret; |
124473a3 | 3292 | } |
3e3665b8 JG |
3293 | if (reply_context) { |
3294 | reply_context->implicit_rotation_on_destroy = true; | |
3295 | } | |
070b6a86 | 3296 | } else if (session->has_been_started && session->current_trace_chunk) { |
7fdbed1c JG |
3297 | /* |
3298 | * The user has not triggered a session rotation. However, to | |
3299 | * ensure all data has been consumed, the session is rotated | |
3300 | * to a 'null' trace chunk before it is destroyed. | |
3301 | * | |
3302 | * This is a "quiet" rotation meaning that no notification is | |
3303 | * emitted and no renaming of the current trace chunk takes | |
3304 | * place. | |
3305 | */ | |
343defc2 MD |
3306 | ret = cmd_rotate_session(session, NULL, true, |
3307 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION); | |
53fb6336 JG |
3308 | /* |
3309 | * Rotation operations may not be supported by the kernel | |
3310 | * tracer. Hence, do not consider this implicit rotation as | |
3311 | * a session destruction error. The library has already stopped | |
3312 | * the session and waited for pending data; there is nothing | |
3313 | * left to do but complete the destruction of the session. | |
3314 | */ | |
3315 | if (ret != LTTNG_OK && | |
3316 | ret != -LTTNG_ERR_ROTATION_NOT_AVAILABLE_KERNEL) { | |
7fdbed1c | 3317 | ERR("Failed to perform a quiet rotation as part of the destruction of session \"%s\": %s", |
53fb6336 | 3318 | session->name, lttng_strerror(ret)); |
3285a971 | 3319 | destruction_last_error = -ret; |
7fdbed1c JG |
3320 | } |
3321 | } | |
5c408ad8 | 3322 | |
a503e1ef JG |
3323 | if (session->shm_path[0]) { |
3324 | /* | |
3325 | * When a session is created with an explicit shm_path, | |
3326 | * the consumer daemon will create its shared memory files | |
3327 | * at that location and will *not* unlink them. This is normal | |
3328 | * as the intention of that feature is to make it possible | |
3329 | * to retrieve the content of those files should a crash occur. | |
3330 | * | |
3331 | * To ensure the content of those files can be used, the | |
3332 | * sessiond daemon will replicate the content of the metadata | |
3333 | * cache in a metadata file. | |
3334 | * | |
3335 | * On clean-up, it is expected that the consumer daemon will | |
3336 | * unlink the shared memory files and that the session daemon | |
3337 | * will unlink the metadata file. Then, the session's directory | |
3338 | * in the shm path can be removed. | |
3339 | * | |
3340 | * Unfortunately, a flaw in the design of the sessiond's and | |
3341 | * consumerd's tear down of channels makes it impossible to | |
3342 | * determine when the sessiond _and_ the consumerd have both | |
3343 | * destroyed their representation of a channel. For one, the | |
3344 | * unlinking, close, and rmdir happen in deferred 'call_rcu' | |
3345 | * callbacks in both daemons. | |
3346 | * | |
3347 | * However, it is also impossible for the sessiond to know when | |
3348 | * the consumer daemon is done destroying its channel(s) since | |
3349 | * it occurs as a reaction to the closing of the channel's file | |
3350 | * descriptor. There is no resulting communication initiated | |
3351 | * from the consumerd to the sessiond to confirm that the | |
3352 | * operation is completed (and was successful). | |
3353 | * | |
3354 | * Until this is all fixed, the session daemon checks for the | |
3355 | * removal of the session's shm path which makes it possible | |
3356 | * to safely advertise a session as having been destroyed. | |
3357 | * | |
3358 | * Prior to this fix, it was not possible to reliably save | |
3359 | * a session making use of the --shm-path option, destroy it, | |
3360 | * and load it again. This is because the creation of the | |
3361 | * session would fail upon seeing the session's shm path | |
3362 | * already in existence. | |
3363 | * | |
3364 | * Note that none of the error paths in the check for the | |
3365 | * directory's existence return an error. This is normal | |
3366 | * as there isn't much that can be done. The session will | |
3367 | * be destroyed properly, except that we can't offer the | |
3368 | * guarantee that the same session can be re-created. | |
3369 | */ | |
3370 | current_completion_handler = &destroy_completion_handler.handler; | |
3371 | ret = lttng_strncpy(destroy_completion_handler.shm_path, | |
3372 | session->shm_path, | |
3373 | sizeof(destroy_completion_handler.shm_path)); | |
3374 | assert(!ret); | |
3375 | } | |
e32d7f27 JG |
3376 | |
3377 | /* | |
3378 | * The session is destroyed. However, note that the command context | |
3379 | * still holds a reference to the session, thus delaying its destruction | |
3380 | * _at least_ up to the point when that reference is released. | |
3381 | */ | |
3382 | session_destroy(session); | |
3e3665b8 | 3383 | if (reply_context) { |
3285a971 | 3384 | reply_context->destruction_status = destruction_last_error; |
3e3665b8 JG |
3385 | ret = session_add_destroy_notifier(session, |
3386 | cmd_destroy_session_reply, | |
3387 | (void *) reply_context); | |
3388 | if (ret) { | |
3389 | ret = LTTNG_ERR_FATAL; | |
3390 | goto end; | |
3391 | } else { | |
3392 | *sock_fd = -1; | |
3393 | } | |
3394 | } | |
3395 | ret = LTTNG_OK; | |
3396 | end: | |
2f77fc4b DG |
3397 | return ret; |
3398 | } | |
3399 | ||
2f77fc4b DG |
3400 | /* |
3401 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
3402 | */ | |
56a37563 JG |
3403 | int cmd_register_consumer(struct ltt_session *session, |
3404 | enum lttng_domain_type domain, const char *sock_path, | |
3405 | struct consumer_data *cdata) | |
2f77fc4b DG |
3406 | { |
3407 | int ret, sock; | |
dd81b457 | 3408 | struct consumer_socket *socket = NULL; |
2f77fc4b DG |
3409 | |
3410 | assert(session); | |
3411 | assert(cdata); | |
3412 | assert(sock_path); | |
3413 | ||
3414 | switch (domain) { | |
3415 | case LTTNG_DOMAIN_KERNEL: | |
3416 | { | |
3417 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3418 | ||
3419 | assert(ksess); | |
3420 | ||
3421 | /* Can't register a consumer if there is already one */ | |
3422 | if (ksess->consumer_fds_sent != 0) { | |
f73fabfd | 3423 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
3424 | goto error; |
3425 | } | |
3426 | ||
3427 | sock = lttcomm_connect_unix_sock(sock_path); | |
3428 | if (sock < 0) { | |
f73fabfd | 3429 | ret = LTTNG_ERR_CONNECT_FAIL; |
2f77fc4b DG |
3430 | goto error; |
3431 | } | |
4ce514c4 | 3432 | cdata->cmd_sock = sock; |
2f77fc4b | 3433 | |
4ce514c4 | 3434 | socket = consumer_allocate_socket(&cdata->cmd_sock); |
2f77fc4b | 3435 | if (socket == NULL) { |
f66c074c DG |
3436 | ret = close(sock); |
3437 | if (ret < 0) { | |
3438 | PERROR("close register consumer"); | |
3439 | } | |
4ce514c4 | 3440 | cdata->cmd_sock = -1; |
f73fabfd | 3441 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
3442 | goto error; |
3443 | } | |
3444 | ||
3445 | socket->lock = zmalloc(sizeof(pthread_mutex_t)); | |
3446 | if (socket->lock == NULL) { | |
3447 | PERROR("zmalloc pthread mutex"); | |
f73fabfd | 3448 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
3449 | goto error; |
3450 | } | |
3451 | pthread_mutex_init(socket->lock, NULL); | |
3452 | socket->registered = 1; | |
3453 | ||
3454 | rcu_read_lock(); | |
3455 | consumer_add_socket(socket, ksess->consumer); | |
3456 | rcu_read_unlock(); | |
3457 | ||
3458 | pthread_mutex_lock(&cdata->pid_mutex); | |
3459 | cdata->pid = -1; | |
3460 | pthread_mutex_unlock(&cdata->pid_mutex); | |
3461 | ||
3462 | break; | |
3463 | } | |
3464 | default: | |
3465 | /* TODO: Userspace tracing */ | |
f73fabfd | 3466 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3467 | goto error; |
3468 | } | |
3469 | ||
dd81b457 | 3470 | return LTTNG_OK; |
2f77fc4b DG |
3471 | |
3472 | error: | |
dd81b457 DG |
3473 | if (socket) { |
3474 | consumer_destroy_socket(socket); | |
3475 | } | |
2f77fc4b DG |
3476 | return ret; |
3477 | } | |
3478 | ||
3479 | /* | |
3480 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
3481 | */ | |
3482 | ssize_t cmd_list_domains(struct ltt_session *session, | |
3483 | struct lttng_domain **domains) | |
3484 | { | |
3485 | int ret, index = 0; | |
3486 | ssize_t nb_dom = 0; | |
fefd409b DG |
3487 | struct agent *agt; |
3488 | struct lttng_ht_iter iter; | |
2f77fc4b DG |
3489 | |
3490 | if (session->kernel_session != NULL) { | |
3491 | DBG3("Listing domains found kernel domain"); | |
3492 | nb_dom++; | |
3493 | } | |
3494 | ||
3495 | if (session->ust_session != NULL) { | |
3496 | DBG3("Listing domains found UST global domain"); | |
3497 | nb_dom++; | |
3c6a091f | 3498 | |
e0a74f01 | 3499 | rcu_read_lock(); |
fefd409b DG |
3500 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
3501 | agt, node.node) { | |
3502 | if (agt->being_used) { | |
3503 | nb_dom++; | |
3504 | } | |
3c6a091f | 3505 | } |
e0a74f01 | 3506 | rcu_read_unlock(); |
2f77fc4b DG |
3507 | } |
3508 | ||
fa64dfb4 JG |
3509 | if (!nb_dom) { |
3510 | goto end; | |
3511 | } | |
3512 | ||
2f77fc4b DG |
3513 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
3514 | if (*domains == NULL) { | |
f73fabfd | 3515 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
3516 | goto error; |
3517 | } | |
3518 | ||
3519 | if (session->kernel_session != NULL) { | |
3520 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
b5edb9e8 PP |
3521 | |
3522 | /* Kernel session buffer type is always GLOBAL */ | |
3523 | (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL; | |
3524 | ||
2f77fc4b DG |
3525 | index++; |
3526 | } | |
3527 | ||
3528 | if (session->ust_session != NULL) { | |
3529 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
88c5f0d8 | 3530 | (*domains)[index].buf_type = session->ust_session->buffer_type; |
2f77fc4b | 3531 | index++; |
3c6a091f | 3532 | |
e0a74f01 | 3533 | rcu_read_lock(); |
fefd409b DG |
3534 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
3535 | agt, node.node) { | |
3536 | if (agt->being_used) { | |
3537 | (*domains)[index].type = agt->domain; | |
3538 | (*domains)[index].buf_type = session->ust_session->buffer_type; | |
3539 | index++; | |
3540 | } | |
3c6a091f | 3541 | } |
e0a74f01 | 3542 | rcu_read_unlock(); |
2f77fc4b | 3543 | } |
fa64dfb4 | 3544 | end: |
2f77fc4b DG |
3545 | return nb_dom; |
3546 | ||
3547 | error: | |
f73fabfd DG |
3548 | /* Return negative value to differentiate return code */ |
3549 | return -ret; | |
2f77fc4b DG |
3550 | } |
3551 | ||
3552 | ||
3553 | /* | |
3554 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
3555 | */ | |
56a37563 JG |
3556 | ssize_t cmd_list_channels(enum lttng_domain_type domain, |
3557 | struct ltt_session *session, struct lttng_channel **channels) | |
2f77fc4b | 3558 | { |
53e367f9 | 3559 | ssize_t nb_chan = 0, payload_size = 0, ret; |
2f77fc4b DG |
3560 | |
3561 | switch (domain) { | |
3562 | case LTTNG_DOMAIN_KERNEL: | |
3563 | if (session->kernel_session != NULL) { | |
3564 | nb_chan = session->kernel_session->channel_count; | |
3565 | } | |
3566 | DBG3("Number of kernel channels %zd", nb_chan); | |
c7d620a2 | 3567 | if (nb_chan <= 0) { |
53e367f9 JG |
3568 | ret = -LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
3569 | goto end; | |
c7d620a2 | 3570 | } |
2f77fc4b DG |
3571 | break; |
3572 | case LTTNG_DOMAIN_UST: | |
3573 | if (session->ust_session != NULL) { | |
7ffc31a2 | 3574 | rcu_read_lock(); |
2f77fc4b | 3575 | nb_chan = lttng_ht_get_count( |
7ffc31a2 JG |
3576 | session->ust_session->domain_global.channels); |
3577 | rcu_read_unlock(); | |
2f77fc4b DG |
3578 | } |
3579 | DBG3("Number of UST global channels %zd", nb_chan); | |
ade7ce52 | 3580 | if (nb_chan < 0) { |
53e367f9 JG |
3581 | ret = -LTTNG_ERR_UST_CHAN_NOT_FOUND; |
3582 | goto end; | |
c7d620a2 | 3583 | } |
2f77fc4b DG |
3584 | break; |
3585 | default: | |
53e367f9 JG |
3586 | ret = -LTTNG_ERR_UND; |
3587 | goto end; | |
2f77fc4b DG |
3588 | } |
3589 | ||
3590 | if (nb_chan > 0) { | |
53e367f9 | 3591 | const size_t channel_size = sizeof(struct lttng_channel) + |
cf0bcb51 JG |
3592 | sizeof(struct lttng_channel_extended); |
3593 | struct lttng_channel_extended *channel_exts; | |
53e367f9 JG |
3594 | |
3595 | payload_size = nb_chan * channel_size; | |
3596 | *channels = zmalloc(payload_size); | |
2f77fc4b | 3597 | if (*channels == NULL) { |
53e367f9 JG |
3598 | ret = -LTTNG_ERR_FATAL; |
3599 | goto end; | |
2f77fc4b DG |
3600 | } |
3601 | ||
53e367f9 JG |
3602 | channel_exts = ((void *) *channels) + |
3603 | (nb_chan * sizeof(struct lttng_channel)); | |
d449df4a MD |
3604 | ret = list_lttng_channels(domain, session, *channels, channel_exts); |
3605 | if (ret != LTTNG_OK) { | |
3606 | free(*channels); | |
3607 | *channels = NULL; | |
3608 | goto end; | |
3609 | } | |
53e367f9 JG |
3610 | } else { |
3611 | *channels = NULL; | |
2f77fc4b DG |
3612 | } |
3613 | ||
53e367f9 JG |
3614 | ret = payload_size; |
3615 | end: | |
3616 | return ret; | |
2f77fc4b DG |
3617 | } |
3618 | ||
3619 | /* | |
3620 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3621 | */ | |
56a37563 JG |
3622 | ssize_t cmd_list_events(enum lttng_domain_type domain, |
3623 | struct ltt_session *session, char *channel_name, | |
e368fb43 | 3624 | struct lttng_payload *payload) |
2f77fc4b DG |
3625 | { |
3626 | int ret = 0; | |
e368fb43 JG |
3627 | ssize_t nb_events = 0; |
3628 | struct lttcomm_event_command_header cmd_header = {}; | |
3629 | const size_t cmd_header_offset = payload->buffer.size; | |
3630 | ||
3631 | ret = lttng_dynamic_buffer_append( | |
3632 | &payload->buffer, &cmd_header, sizeof(cmd_header)); | |
3633 | if (ret) { | |
3634 | ret = LTTNG_ERR_NOMEM; | |
3635 | goto error; | |
3636 | } | |
2f77fc4b DG |
3637 | |
3638 | switch (domain) { | |
3639 | case LTTNG_DOMAIN_KERNEL: | |
3640 | if (session->kernel_session != NULL) { | |
e368fb43 JG |
3641 | nb_events = list_lttng_kernel_events(channel_name, |
3642 | session->kernel_session, payload); | |
2f77fc4b DG |
3643 | } |
3644 | break; | |
3645 | case LTTNG_DOMAIN_UST: | |
3646 | { | |
3647 | if (session->ust_session != NULL) { | |
e368fb43 JG |
3648 | nb_events = list_lttng_ust_global_events(channel_name, |
3649 | &session->ust_session->domain_global, | |
3650 | payload); | |
2f77fc4b DG |
3651 | } |
3652 | break; | |
3653 | } | |
5cdb6027 | 3654 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 3655 | case LTTNG_DOMAIN_JUL: |
0e115563 | 3656 | case LTTNG_DOMAIN_PYTHON: |
3c6a091f | 3657 | if (session->ust_session) { |
fefd409b DG |
3658 | struct lttng_ht_iter iter; |
3659 | struct agent *agt; | |
3660 | ||
b11feea5 | 3661 | rcu_read_lock(); |
fefd409b DG |
3662 | cds_lfht_for_each_entry(session->ust_session->agents->ht, |
3663 | &iter.iter, agt, node.node) { | |
1dfd9906 | 3664 | if (agt->domain == domain) { |
e368fb43 JG |
3665 | nb_events = list_lttng_agent_events( |
3666 | agt, payload); | |
1dfd9906 JG |
3667 | break; |
3668 | } | |
fefd409b | 3669 | } |
b11feea5 | 3670 | rcu_read_unlock(); |
3c6a091f DG |
3671 | } |
3672 | break; | |
2f77fc4b | 3673 | default: |
f73fabfd | 3674 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3675 | goto error; |
3676 | } | |
3677 | ||
e368fb43 JG |
3678 | ((struct lttcomm_event_command_header *) (payload->buffer.data + |
3679 | cmd_header_offset))->nb_events = (uint32_t) nb_events; | |
3680 | ||
3681 | return nb_events; | |
2f77fc4b DG |
3682 | |
3683 | error: | |
f73fabfd DG |
3684 | /* Return negative value to differentiate return code */ |
3685 | return -ret; | |
2f77fc4b DG |
3686 | } |
3687 | ||
3688 | /* | |
3689 | * Using the session list, filled a lttng_session array to send back to the | |
3690 | * client for session listing. | |
3691 | * | |
3692 | * The session list lock MUST be acquired before calling this function. Use | |
3693 | * session_lock_list() and session_unlock_list(). | |
3694 | */ | |
b178f53e JG |
3695 | void cmd_list_lttng_sessions(struct lttng_session *sessions, |
3696 | size_t session_count, uid_t uid, gid_t gid) | |
2f77fc4b DG |
3697 | { |
3698 | int ret; | |
3699 | unsigned int i = 0; | |
3700 | struct ltt_session *session; | |
3701 | struct ltt_session_list *list = session_get_list(); | |
b178f53e JG |
3702 | struct lttng_session_extended *extended = |
3703 | (typeof(extended)) (&sessions[session_count]); | |
2f77fc4b DG |
3704 | |
3705 | DBG("Getting all available session for UID %d GID %d", | |
3706 | uid, gid); | |
3707 | /* | |
3708 | * Iterate over session list and append data after the control struct in | |
3709 | * the buffer. | |
3710 | */ | |
3711 | cds_list_for_each_entry(session, &list->head, list) { | |
e32d7f27 JG |
3712 | if (!session_get(session)) { |
3713 | continue; | |
3714 | } | |
2f77fc4b DG |
3715 | /* |
3716 | * Only list the sessions the user can control. | |
3717 | */ | |
e32d7f27 JG |
3718 | if (!session_access_ok(session, uid, gid) || |
3719 | session->destroyed) { | |
3720 | session_put(session); | |
2f77fc4b DG |
3721 | continue; |
3722 | } | |
3723 | ||
3724 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3725 | struct ltt_ust_session *usess = session->ust_session; | |
3726 | ||
3727 | if (session->consumer->type == CONSUMER_DST_NET || | |
3728 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
3729 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
3730 | ret = build_network_session_path(sessions[i].path, | |
dec56f6c | 3731 | sizeof(sessions[i].path), session); |
2f77fc4b | 3732 | } else { |
dec56f6c | 3733 | ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s", |
366a9222 | 3734 | session->consumer->dst.session_root_path); |
2f77fc4b DG |
3735 | } |
3736 | if (ret < 0) { | |
3737 | PERROR("snprintf session path"); | |
e32d7f27 | 3738 | session_put(session); |
2f77fc4b DG |
3739 | continue; |
3740 | } | |
3741 | ||
3742 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
3743 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
8382cf6f | 3744 | sessions[i].enabled = session->active; |
2cbf8fed | 3745 | sessions[i].snapshot_mode = session->snapshot_mode; |
8960e9cd | 3746 | sessions[i].live_timer_interval = session->live_timer; |
b178f53e JG |
3747 | extended[i].creation_time.value = (uint64_t) session->creation_time; |
3748 | extended[i].creation_time.is_set = 1; | |
2f77fc4b | 3749 | i++; |
e32d7f27 | 3750 | session_put(session); |
2f77fc4b DG |
3751 | } |
3752 | } | |
3753 | ||
806e2684 | 3754 | /* |
6d805429 | 3755 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
d3f14b8a | 3756 | * ready for trace analysis (or any kind of reader) or else 1 for pending data. |
806e2684 | 3757 | */ |
6d805429 | 3758 | int cmd_data_pending(struct ltt_session *session) |
806e2684 DG |
3759 | { |
3760 | int ret; | |
3761 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3762 | struct ltt_ust_session *usess = session->ust_session; | |
3763 | ||
3764 | assert(session); | |
3765 | ||
5c408ad8 JD |
3766 | DBG("Data pending for session %s", session->name); |
3767 | ||
806e2684 | 3768 | /* Session MUST be stopped to ask for data availability. */ |
8382cf6f | 3769 | if (session->active) { |
806e2684 DG |
3770 | ret = LTTNG_ERR_SESSION_STARTED; |
3771 | goto error; | |
3a89d11a DG |
3772 | } else { |
3773 | /* | |
3774 | * If stopped, just make sure we've started before else the above call | |
3775 | * will always send that there is data pending. | |
3776 | * | |
3777 | * The consumer assumes that when the data pending command is received, | |
3778 | * the trace has been started before or else no output data is written | |
3779 | * by the streams which is a condition for data pending. So, this is | |
3780 | * *VERY* important that we don't ask the consumer before a start | |
3781 | * trace. | |
3782 | */ | |
8382cf6f | 3783 | if (!session->has_been_started) { |
3a89d11a DG |
3784 | ret = 0; |
3785 | goto error; | |
3786 | } | |
806e2684 DG |
3787 | } |
3788 | ||
92816cc3 JG |
3789 | /* A rotation is still pending, we have to wait. */ |
3790 | if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) { | |
5c408ad8 JD |
3791 | DBG("Rotate still pending for session %s", session->name); |
3792 | ret = 1; | |
3793 | goto error; | |
3794 | } | |
3795 | ||
806e2684 | 3796 | if (ksess && ksess->consumer) { |
6d805429 DG |
3797 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
3798 | if (ret == 1) { | |
806e2684 DG |
3799 | /* Data is still being extracted for the kernel. */ |
3800 | goto error; | |
3801 | } | |
3802 | } | |
3803 | ||
3804 | if (usess && usess->consumer) { | |
6d805429 DG |
3805 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
3806 | if (ret == 1) { | |
806e2684 DG |
3807 | /* Data is still being extracted for the kernel. */ |
3808 | goto error; | |
3809 | } | |
3810 | } | |
3811 | ||
3812 | /* Data is ready to be read by a viewer */ | |
6d805429 | 3813 | ret = 0; |
806e2684 DG |
3814 | |
3815 | error: | |
3816 | return ret; | |
3817 | } | |
3818 | ||
6dc3064a DG |
3819 | /* |
3820 | * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library. | |
3821 | * | |
3822 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3823 | */ | |
3824 | int cmd_snapshot_add_output(struct ltt_session *session, | |
df4f5a87 | 3825 | const struct lttng_snapshot_output *output, uint32_t *id) |
6dc3064a DG |
3826 | { |
3827 | int ret; | |
3828 | struct snapshot_output *new_output; | |
3829 | ||
3830 | assert(session); | |
3831 | assert(output); | |
3832 | ||
3833 | DBG("Cmd snapshot add output for session %s", session->name); | |
3834 | ||
3835 | /* | |
903ef685 | 3836 | * Can't create an output if the session is not set in no-output mode. |
6dc3064a DG |
3837 | */ |
3838 | if (session->output_traces) { | |
903ef685 | 3839 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3840 | goto error; |
3841 | } | |
3842 | ||
54213acc JG |
3843 | if (session->has_non_mmap_channel) { |
3844 | ret = LTTNG_ERR_SNAPSHOT_UNSUPPORTED; | |
3845 | goto error; | |
3846 | } | |
3847 | ||
6dc3064a DG |
3848 | /* Only one output is allowed until we have the "tee" feature. */ |
3849 | if (session->snapshot.nb_output == 1) { | |
3850 | ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST; | |
3851 | goto error; | |
3852 | } | |
3853 | ||
3854 | new_output = snapshot_output_alloc(); | |
3855 | if (!new_output) { | |
3856 | ret = LTTNG_ERR_NOMEM; | |
3857 | goto error; | |
3858 | } | |
3859 | ||
b178f53e | 3860 | ret = snapshot_output_init(session, output->max_size, output->name, |
6dc3064a DG |
3861 | output->ctrl_url, output->data_url, session->consumer, new_output, |
3862 | &session->snapshot); | |
3863 | if (ret < 0) { | |
3864 | if (ret == -ENOMEM) { | |
3865 | ret = LTTNG_ERR_NOMEM; | |
3866 | } else { | |
3867 | ret = LTTNG_ERR_INVALID; | |
3868 | } | |
3869 | goto free_error; | |
3870 | } | |
3871 | ||
6dc3064a DG |
3872 | rcu_read_lock(); |
3873 | snapshot_add_output(&session->snapshot, new_output); | |
3874 | if (id) { | |
3875 | *id = new_output->id; | |
3876 | } | |
3877 | rcu_read_unlock(); | |
3878 | ||
3879 | return LTTNG_OK; | |
3880 | ||
3881 | free_error: | |
3882 | snapshot_output_destroy(new_output); | |
3883 | error: | |
3884 | return ret; | |
3885 | } | |
3886 | ||
3887 | /* | |
3888 | * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl. | |
3889 | * | |
3890 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3891 | */ | |
3892 | int cmd_snapshot_del_output(struct ltt_session *session, | |
df4f5a87 | 3893 | const struct lttng_snapshot_output *output) |
6dc3064a DG |
3894 | { |
3895 | int ret; | |
eb240553 | 3896 | struct snapshot_output *sout = NULL; |
6dc3064a DG |
3897 | |
3898 | assert(session); | |
3899 | assert(output); | |
3900 | ||
6dc3064a DG |
3901 | rcu_read_lock(); |
3902 | ||
3903 | /* | |
d3f14b8a MD |
3904 | * Permission denied to create an output if the session is not |
3905 | * set in no output mode. | |
6dc3064a DG |
3906 | */ |
3907 | if (session->output_traces) { | |
903ef685 | 3908 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3909 | goto error; |
3910 | } | |
3911 | ||
eb240553 DG |
3912 | if (output->id) { |
3913 | DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id, | |
3914 | session->name); | |
3915 | sout = snapshot_find_output_by_id(output->id, &session->snapshot); | |
3916 | } else if (*output->name != '\0') { | |
3917 | DBG("Cmd snapshot del output name %s for session %s", output->name, | |
3918 | session->name); | |
3919 | sout = snapshot_find_output_by_name(output->name, &session->snapshot); | |
3920 | } | |
6dc3064a DG |
3921 | if (!sout) { |
3922 | ret = LTTNG_ERR_INVALID; | |
3923 | goto error; | |
3924 | } | |
3925 | ||
3926 | snapshot_delete_output(&session->snapshot, sout); | |
3927 | snapshot_output_destroy(sout); | |
3928 | ret = LTTNG_OK; | |
3929 | ||
3930 | error: | |
3931 | rcu_read_unlock(); | |
3932 | return ret; | |
3933 | } | |
3934 | ||
3935 | /* | |
3936 | * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl. | |
3937 | * | |
3938 | * If no output is available, outputs is untouched and 0 is returned. | |
3939 | * | |
3940 | * Return the size of the newly allocated outputs or a negative LTTNG_ERR code. | |
3941 | */ | |
3942 | ssize_t cmd_snapshot_list_outputs(struct ltt_session *session, | |
3943 | struct lttng_snapshot_output **outputs) | |
3944 | { | |
3945 | int ret, idx = 0; | |
b223ca94 | 3946 | struct lttng_snapshot_output *list = NULL; |
6dc3064a DG |
3947 | struct lttng_ht_iter iter; |
3948 | struct snapshot_output *output; | |
3949 | ||
3950 | assert(session); | |
3951 | assert(outputs); | |
3952 | ||
3953 | DBG("Cmd snapshot list outputs for session %s", session->name); | |
3954 | ||
3955 | /* | |
d3f14b8a MD |
3956 | * Permission denied to create an output if the session is not |
3957 | * set in no output mode. | |
6dc3064a DG |
3958 | */ |
3959 | if (session->output_traces) { | |
903ef685 JG |
3960 | ret = -LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
3961 | goto end; | |
6dc3064a DG |
3962 | } |
3963 | ||
3964 | if (session->snapshot.nb_output == 0) { | |
3965 | ret = 0; | |
903ef685 | 3966 | goto end; |
6dc3064a DG |
3967 | } |
3968 | ||
3969 | list = zmalloc(session->snapshot.nb_output * sizeof(*list)); | |
3970 | if (!list) { | |
b223ca94 | 3971 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3972 | goto end; |
6dc3064a DG |
3973 | } |
3974 | ||
3975 | /* Copy list from session to the new list object. */ | |
b223ca94 | 3976 | rcu_read_lock(); |
6dc3064a DG |
3977 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter, |
3978 | output, node.node) { | |
3979 | assert(output->consumer); | |
3980 | list[idx].id = output->id; | |
3981 | list[idx].max_size = output->max_size; | |
6ce22875 MD |
3982 | if (lttng_strncpy(list[idx].name, output->name, |
3983 | sizeof(list[idx].name))) { | |
3984 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 3985 | goto error; |
6ce22875 | 3986 | } |
6dc3064a | 3987 | if (output->consumer->type == CONSUMER_DST_LOCAL) { |
6ce22875 | 3988 | if (lttng_strncpy(list[idx].ctrl_url, |
366a9222 | 3989 | output->consumer->dst.session_root_path, |
6ce22875 MD |
3990 | sizeof(list[idx].ctrl_url))) { |
3991 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 3992 | goto error; |
6ce22875 | 3993 | } |
6dc3064a DG |
3994 | } else { |
3995 | /* Control URI. */ | |
3996 | ret = uri_to_str_url(&output->consumer->dst.net.control, | |
3997 | list[idx].ctrl_url, sizeof(list[idx].ctrl_url)); | |
3998 | if (ret < 0) { | |
b223ca94 | 3999 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 4000 | goto error; |
6dc3064a DG |
4001 | } |
4002 | ||
4003 | /* Data URI. */ | |
4004 | ret = uri_to_str_url(&output->consumer->dst.net.data, | |
4005 | list[idx].data_url, sizeof(list[idx].data_url)); | |
4006 | if (ret < 0) { | |
b223ca94 | 4007 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 4008 | goto error; |
6dc3064a DG |
4009 | } |
4010 | } | |
4011 | idx++; | |
4012 | } | |
4013 | ||
4014 | *outputs = list; | |
b223ca94 JG |
4015 | list = NULL; |
4016 | ret = session->snapshot.nb_output; | |
6dc3064a | 4017 | error: |
903ef685 | 4018 | rcu_read_unlock(); |
b223ca94 | 4019 | free(list); |
903ef685 | 4020 | end: |
b223ca94 | 4021 | return ret; |
6dc3064a DG |
4022 | } |
4023 | ||
93ec662e JD |
4024 | /* |
4025 | * Check if we can regenerate the metadata for this session. | |
4026 | * Only kernel, UST per-uid and non-live sessions are supported. | |
4027 | * | |
4028 | * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise. | |
4029 | */ | |
4030 | static | |
eded6438 | 4031 | int check_regenerate_metadata_support(struct ltt_session *session) |
93ec662e JD |
4032 | { |
4033 | int ret; | |
4034 | ||
4035 | assert(session); | |
4036 | ||
4037 | if (session->live_timer != 0) { | |
4038 | ret = LTTNG_ERR_LIVE_SESSION; | |
4039 | goto end; | |
4040 | } | |
4041 | if (!session->active) { | |
4042 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
4043 | goto end; | |
4044 | } | |
4045 | if (session->ust_session) { | |
4046 | switch (session->ust_session->buffer_type) { | |
4047 | case LTTNG_BUFFER_PER_UID: | |
4048 | break; | |
4049 | case LTTNG_BUFFER_PER_PID: | |
4050 | ret = LTTNG_ERR_PER_PID_SESSION; | |
4051 | goto end; | |
4052 | default: | |
4053 | assert(0); | |
4054 | ret = LTTNG_ERR_UNK; | |
4055 | goto end; | |
4056 | } | |
4057 | } | |
4058 | if (session->consumer->type == CONSUMER_DST_NET && | |
4059 | session->consumer->relay_minor_version < 8) { | |
4060 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; | |
4061 | goto end; | |
4062 | } | |
4063 | ret = 0; | |
4064 | ||
4065 | end: | |
4066 | return ret; | |
4067 | } | |
4068 | ||
7802bae3 LL |
4069 | static |
4070 | int clear_metadata_file(int fd) | |
4071 | { | |
4072 | int ret; | |
a5df8828 | 4073 | off_t lseek_ret; |
7802bae3 | 4074 | |
a5df8828 GL |
4075 | lseek_ret = lseek(fd, 0, SEEK_SET); |
4076 | if (lseek_ret < 0) { | |
7802bae3 | 4077 | PERROR("lseek"); |
a5df8828 | 4078 | ret = -1; |
7802bae3 LL |
4079 | goto end; |
4080 | } | |
4081 | ||
4082 | ret = ftruncate(fd, 0); | |
4083 | if (ret < 0) { | |
4084 | PERROR("ftruncate"); | |
4085 | goto end; | |
4086 | } | |
4087 | ||
4088 | end: | |
4089 | return ret; | |
4090 | } | |
4091 | ||
93ec662e | 4092 | static |
eded6438 | 4093 | int ust_regenerate_metadata(struct ltt_ust_session *usess) |
93ec662e JD |
4094 | { |
4095 | int ret = 0; | |
4096 | struct buffer_reg_uid *uid_reg = NULL; | |
4097 | struct buffer_reg_session *session_reg = NULL; | |
4098 | ||
4099 | rcu_read_lock(); | |
4100 | cds_list_for_each_entry(uid_reg, &usess->buffer_reg_uid_list, lnode) { | |
4101 | struct ust_registry_session *registry; | |
4102 | struct ust_registry_channel *chan; | |
4103 | struct lttng_ht_iter iter_chan; | |
4104 | ||
4105 | session_reg = uid_reg->registry; | |
4106 | registry = session_reg->reg.ust; | |
4107 | ||
4108 | pthread_mutex_lock(®istry->lock); | |
4109 | registry->metadata_len_sent = 0; | |
4110 | memset(registry->metadata, 0, registry->metadata_alloc_len); | |
4111 | registry->metadata_len = 0; | |
4112 | registry->metadata_version++; | |
7802bae3 LL |
4113 | if (registry->metadata_fd > 0) { |
4114 | /* Clear the metadata file's content. */ | |
4115 | ret = clear_metadata_file(registry->metadata_fd); | |
4116 | if (ret) { | |
4117 | pthread_mutex_unlock(®istry->lock); | |
4118 | goto end; | |
4119 | } | |
4120 | } | |
4121 | ||
93ec662e JD |
4122 | ret = ust_metadata_session_statedump(registry, NULL, |
4123 | registry->major, registry->minor); | |
4124 | if (ret) { | |
4125 | pthread_mutex_unlock(®istry->lock); | |
4126 | ERR("Failed to generate session metadata (err = %d)", | |
4127 | ret); | |
4128 | goto end; | |
4129 | } | |
4130 | cds_lfht_for_each_entry(registry->channels->ht, &iter_chan.iter, | |
4131 | chan, node.node) { | |
4132 | struct ust_registry_event *event; | |
4133 | struct lttng_ht_iter iter_event; | |
4134 | ||
4135 | ret = ust_metadata_channel_statedump(registry, chan); | |
4136 | if (ret) { | |
4137 | pthread_mutex_unlock(®istry->lock); | |
4138 | ERR("Failed to generate channel metadata " | |
4139 | "(err = %d)", ret); | |
4140 | goto end; | |
4141 | } | |
4142 | cds_lfht_for_each_entry(chan->ht->ht, &iter_event.iter, | |
4143 | event, node.node) { | |
4144 | ret = ust_metadata_event_statedump(registry, | |
4145 | chan, event); | |
4146 | if (ret) { | |
4147 | pthread_mutex_unlock(®istry->lock); | |
4148 | ERR("Failed to generate event metadata " | |
4149 | "(err = %d)", ret); | |
4150 | goto end; | |
4151 | } | |
4152 | } | |
4153 | } | |
4154 | pthread_mutex_unlock(®istry->lock); | |
4155 | } | |
4156 | ||
4157 | end: | |
4158 | rcu_read_unlock(); | |
4159 | return ret; | |
4160 | } | |
4161 | ||
4162 | /* | |
eded6438 | 4163 | * Command LTTNG_REGENERATE_METADATA from the lttng-ctl library. |
93ec662e JD |
4164 | * |
4165 | * Ask the consumer to truncate the existing metadata file(s) and | |
4166 | * then regenerate the metadata. Live and per-pid sessions are not | |
4167 | * supported and return an error. | |
4168 | * | |
4169 | * Return 0 on success or else a LTTNG_ERR code. | |
4170 | */ | |
eded6438 | 4171 | int cmd_regenerate_metadata(struct ltt_session *session) |
93ec662e JD |
4172 | { |
4173 | int ret; | |
4174 | ||
4175 | assert(session); | |
4176 | ||
eded6438 | 4177 | ret = check_regenerate_metadata_support(session); |
93ec662e JD |
4178 | if (ret) { |
4179 | goto end; | |
4180 | } | |
4181 | ||
4182 | if (session->kernel_session) { | |
eded6438 | 4183 | ret = kernctl_session_regenerate_metadata( |
93ec662e JD |
4184 | session->kernel_session->fd); |
4185 | if (ret < 0) { | |
4186 | ERR("Failed to regenerate the kernel metadata"); | |
4187 | goto end; | |
4188 | } | |
4189 | } | |
4190 | ||
4191 | if (session->ust_session) { | |
eded6438 | 4192 | ret = ust_regenerate_metadata(session->ust_session); |
93ec662e JD |
4193 | if (ret < 0) { |
4194 | ERR("Failed to regenerate the UST metadata"); | |
4195 | goto end; | |
4196 | } | |
4197 | } | |
4198 | DBG("Cmd metadata regenerate for session %s", session->name); | |
4199 | ret = LTTNG_OK; | |
4200 | ||
4201 | end: | |
4202 | return ret; | |
4203 | } | |
4204 | ||
c2561365 JD |
4205 | /* |
4206 | * Command LTTNG_REGENERATE_STATEDUMP from the lttng-ctl library. | |
4207 | * | |
4208 | * Ask the tracer to regenerate a new statedump. | |
4209 | * | |
4210 | * Return 0 on success or else a LTTNG_ERR code. | |
4211 | */ | |
4212 | int cmd_regenerate_statedump(struct ltt_session *session) | |
4213 | { | |
4214 | int ret; | |
4215 | ||
4216 | assert(session); | |
4217 | ||
4218 | if (!session->active) { | |
4219 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
4220 | goto end; | |
4221 | } | |
c2561365 JD |
4222 | |
4223 | if (session->kernel_session) { | |
4224 | ret = kernctl_session_regenerate_statedump( | |
4225 | session->kernel_session->fd); | |
4226 | /* | |
4227 | * Currently, the statedump in kernel can only fail if out | |
4228 | * of memory. | |
4229 | */ | |
4230 | if (ret < 0) { | |
4231 | if (ret == -ENOMEM) { | |
4232 | ret = LTTNG_ERR_REGEN_STATEDUMP_NOMEM; | |
4233 | } else { | |
4234 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
4235 | } | |
4236 | ERR("Failed to regenerate the kernel statedump"); | |
4237 | goto end; | |
4238 | } | |
4239 | } | |
4240 | ||
4241 | if (session->ust_session) { | |
4242 | ret = ust_app_regenerate_statedump_all(session->ust_session); | |
4243 | /* | |
4244 | * Currently, the statedump in UST always returns 0. | |
4245 | */ | |
4246 | if (ret < 0) { | |
4247 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
4248 | ERR("Failed to regenerate the UST statedump"); | |
4249 | goto end; | |
4250 | } | |
4251 | } | |
4252 | DBG("Cmd regenerate statedump for session %s", session->name); | |
4253 | ret = LTTNG_OK; | |
4254 | ||
4255 | end: | |
4256 | return ret; | |
4257 | } | |
4258 | ||
b0880ae5 JG |
4259 | int cmd_register_trigger(struct command_ctx *cmd_ctx, int sock, |
4260 | struct notification_thread_handle *notification_thread) | |
4261 | { | |
4262 | int ret; | |
4263 | size_t trigger_len; | |
4264 | ssize_t sock_recv_len; | |
4265 | struct lttng_trigger *trigger = NULL; | |
c0a66c84 | 4266 | struct lttng_payload trigger_payload; |
3da864a9 JR |
4267 | struct lttng_credentials cmd_creds = { |
4268 | .uid = cmd_ctx->creds.uid, | |
4269 | .gid = cmd_ctx->creds.gid, | |
4270 | }; | |
b0880ae5 | 4271 | |
c0a66c84 | 4272 | lttng_payload_init(&trigger_payload); |
3a91de3a | 4273 | trigger_len = (size_t) cmd_ctx->lsm.u.trigger.length; |
c0a66c84 JG |
4274 | ret = lttng_dynamic_buffer_set_size( |
4275 | &trigger_payload.buffer, trigger_len); | |
b0880ae5 JG |
4276 | if (ret) { |
4277 | ret = LTTNG_ERR_NOMEM; | |
4278 | goto end; | |
4279 | } | |
4280 | ||
c0a66c84 JG |
4281 | sock_recv_len = lttcomm_recv_unix_sock( |
4282 | sock, trigger_payload.buffer.data, trigger_len); | |
b0880ae5 JG |
4283 | if (sock_recv_len < 0 || sock_recv_len != trigger_len) { |
4284 | ERR("Failed to receive \"register trigger\" command payload"); | |
4285 | /* TODO: should this be a new error enum ? */ | |
4286 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
4287 | goto end; | |
4288 | } | |
4289 | ||
99608320 JR |
4290 | /* Receive fds, if any. */ |
4291 | if (cmd_ctx->lsm.fd_count > 0) { | |
4292 | ret = lttcomm_recv_payload_fds_unix_sock( | |
4293 | sock, cmd_ctx->lsm.fd_count, &trigger_payload); | |
4294 | if (ret > 0 && ret != cmd_ctx->lsm.fd_count * sizeof(int)) { | |
4295 | ret = LTTNG_ERR_INVALID_PROTOCOL; | |
4296 | goto end; | |
4297 | } else if (ret <= 0) { | |
4298 | ret = LTTNG_ERR_FATAL; | |
4299 | goto end; | |
4300 | } | |
4301 | } | |
4302 | ||
4303 | /* Deserialize trigger. */ | |
c0a66c84 JG |
4304 | { |
4305 | struct lttng_payload_view view = | |
4306 | lttng_payload_view_from_payload( | |
4307 | &trigger_payload, 0, -1); | |
4308 | ||
4309 | if (lttng_trigger_create_from_payload(&view, &trigger) != | |
4310 | trigger_len) { | |
4311 | ERR("Invalid trigger payload received in \"register trigger\" command"); | |
4312 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
4313 | goto end; | |
4314 | } | |
b0880ae5 JG |
4315 | } |
4316 | ||
3da864a9 JR |
4317 | /* Set the trigger credential */ |
4318 | lttng_trigger_set_credentials(trigger, &cmd_creds); | |
4319 | ||
4320 | /* Inform the notification thread */ | |
b0880ae5 JG |
4321 | ret = notification_thread_command_register_trigger(notification_thread, |
4322 | trigger); | |
587f9fd0 JG |
4323 | /* Ownership of trigger was transferred. */ |
4324 | trigger = NULL; | |
b0880ae5 | 4325 | end: |
587f9fd0 | 4326 | lttng_trigger_destroy(trigger); |
c0a66c84 | 4327 | lttng_payload_reset(&trigger_payload); |
b0880ae5 JG |
4328 | return ret; |
4329 | } | |
4330 | ||
4331 | int cmd_unregister_trigger(struct command_ctx *cmd_ctx, int sock, | |
4332 | struct notification_thread_handle *notification_thread) | |
4333 | { | |
4334 | int ret; | |
4335 | size_t trigger_len; | |
4336 | ssize_t sock_recv_len; | |
4337 | struct lttng_trigger *trigger = NULL; | |
c0a66c84 | 4338 | struct lttng_payload trigger_payload; |
3da864a9 JR |
4339 | struct lttng_credentials cmd_creds = { |
4340 | .uid = cmd_ctx->creds.uid, | |
4341 | .gid = cmd_ctx->creds.gid, | |
4342 | }; | |
b0880ae5 | 4343 | |
c0a66c84 | 4344 | lttng_payload_init(&trigger_payload); |
3a91de3a | 4345 | trigger_len = (size_t) cmd_ctx->lsm.u.trigger.length; |
c0a66c84 JG |
4346 | ret = lttng_dynamic_buffer_set_size( |
4347 | &trigger_payload.buffer, trigger_len); | |
b0880ae5 JG |
4348 | if (ret) { |
4349 | ret = LTTNG_ERR_NOMEM; | |
4350 | goto end; | |
4351 | } | |
4352 | ||
c0a66c84 JG |
4353 | sock_recv_len = lttcomm_recv_unix_sock( |
4354 | sock, trigger_payload.buffer.data, trigger_len); | |
b0880ae5 JG |
4355 | if (sock_recv_len < 0 || sock_recv_len != trigger_len) { |
4356 | ERR("Failed to receive \"unregister trigger\" command payload"); | |
4357 | /* TODO: should this be a new error enum ? */ | |
4358 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
4359 | goto end; | |
4360 | } | |
4361 | ||
99608320 JR |
4362 | /* Receive fds, if any. */ |
4363 | if (cmd_ctx->lsm.fd_count > 0) { | |
4364 | ret = lttcomm_recv_payload_fds_unix_sock( | |
4365 | sock, cmd_ctx->lsm.fd_count, &trigger_payload); | |
4366 | if (ret > 0 && ret != cmd_ctx->lsm.fd_count * sizeof(int)) { | |
4367 | ret = LTTNG_ERR_INVALID_PROTOCOL; | |
4368 | goto end; | |
4369 | } else if (ret <= 0) { | |
4370 | ret = LTTNG_ERR_FATAL; | |
4371 | goto end; | |
4372 | } | |
4373 | } | |
4374 | ||
c0a66c84 JG |
4375 | { |
4376 | struct lttng_payload_view view = | |
4377 | lttng_payload_view_from_payload( | |
4378 | &trigger_payload, 0, -1); | |
4379 | ||
4380 | if (lttng_trigger_create_from_payload(&view, &trigger) != | |
4381 | trigger_len) { | |
4382 | ERR("Invalid trigger payload received in \"unregister trigger\" command"); | |
4383 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
4384 | goto end; | |
4385 | } | |
b0880ae5 JG |
4386 | } |
4387 | ||
3da864a9 JR |
4388 | lttng_trigger_set_credentials(trigger, &cmd_creds); |
4389 | ||
b0880ae5 JG |
4390 | ret = notification_thread_command_unregister_trigger(notification_thread, |
4391 | trigger); | |
4392 | end: | |
587f9fd0 | 4393 | lttng_trigger_destroy(trigger); |
c0a66c84 | 4394 | lttng_payload_reset(&trigger_payload); |
b0880ae5 JG |
4395 | return ret; |
4396 | } | |
4397 | ||
6dc3064a DG |
4398 | /* |
4399 | * Send relayd sockets from snapshot output to consumer. Ignore request if the | |
4400 | * snapshot output is *not* set with a remote destination. | |
4401 | * | |
9a654598 | 4402 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a | 4403 | */ |
9a654598 | 4404 | static enum lttng_error_code set_relayd_for_snapshot( |
348a81dc | 4405 | struct consumer_output *output, |
fb9a95c4 | 4406 | const struct ltt_session *session) |
6dc3064a | 4407 | { |
9a654598 | 4408 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
4409 | struct lttng_ht_iter iter; |
4410 | struct consumer_socket *socket; | |
1e791a74 | 4411 | LTTNG_OPTIONAL(uint64_t) current_chunk_id = {}; |
6fa5fe7c | 4412 | const char *base_path; |
6dc3064a | 4413 | |
348a81dc | 4414 | assert(output); |
6dc3064a DG |
4415 | assert(session); |
4416 | ||
4417 | DBG2("Set relayd object from snapshot output"); | |
4418 | ||
1e791a74 | 4419 | if (session->current_trace_chunk) { |
348a81dc JG |
4420 | enum lttng_trace_chunk_status chunk_status = |
4421 | lttng_trace_chunk_get_id( | |
4422 | session->current_trace_chunk, | |
4423 | ¤t_chunk_id.value); | |
1e791a74 | 4424 | |
348a81dc | 4425 | if (chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK) { |
1e791a74 JG |
4426 | current_chunk_id.is_set = true; |
4427 | } else { | |
4428 | ERR("Failed to get current trace chunk id"); | |
4429 | status = LTTNG_ERR_UNK; | |
4430 | goto error; | |
4431 | } | |
4432 | } | |
4433 | ||
6dc3064a | 4434 | /* Ignore if snapshot consumer output is not network. */ |
348a81dc | 4435 | if (output->type != CONSUMER_DST_NET) { |
6dc3064a DG |
4436 | goto error; |
4437 | } | |
4438 | ||
6fa5fe7c MD |
4439 | /* |
4440 | * The snapshot record URI base path overrides the session | |
4441 | * base path. | |
4442 | */ | |
4443 | if (output->dst.net.control.subdir[0] != '\0') { | |
4444 | base_path = output->dst.net.control.subdir; | |
4445 | } else { | |
4446 | base_path = session->base_path; | |
4447 | } | |
4448 | ||
6dc3064a DG |
4449 | /* |
4450 | * For each consumer socket, create and send the relayd object of the | |
4451 | * snapshot output. | |
4452 | */ | |
4453 | rcu_read_lock(); | |
348a81dc | 4454 | cds_lfht_for_each_entry(output->socks->ht, &iter.iter, |
5eecee74 | 4455 | socket, node.node) { |
ecd0f96d | 4456 | pthread_mutex_lock(socket->lock); |
9a654598 | 4457 | status = send_consumer_relayd_sockets(0, session->id, |
348a81dc | 4458 | output, socket, |
d3e2ba59 | 4459 | session->name, session->hostname, |
6fa5fe7c | 4460 | base_path, |
1e791a74 | 4461 | session->live_timer, |
db1da059 | 4462 | current_chunk_id.is_set ? ¤t_chunk_id.value : NULL, |
46ef2188 MD |
4463 | session->creation_time, |
4464 | session->name_contains_creation_time); | |
ecd0f96d | 4465 | pthread_mutex_unlock(socket->lock); |
9a654598 | 4466 | if (status != LTTNG_OK) { |
6dc3064a DG |
4467 | rcu_read_unlock(); |
4468 | goto error; | |
4469 | } | |
4470 | } | |
4471 | rcu_read_unlock(); | |
4472 | ||
4473 | error: | |
9a654598 | 4474 | return status; |
6dc3064a DG |
4475 | } |
4476 | ||
4477 | /* | |
4478 | * Record a kernel snapshot. | |
4479 | * | |
fac41e72 | 4480 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a | 4481 | */ |
fb9a95c4 JG |
4482 | static enum lttng_error_code record_kernel_snapshot( |
4483 | struct ltt_kernel_session *ksess, | |
348a81dc | 4484 | const struct consumer_output *output, |
fb9a95c4 | 4485 | const struct ltt_session *session, |
d07ceecd | 4486 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a | 4487 | { |
9a654598 | 4488 | enum lttng_error_code status; |
6dc3064a DG |
4489 | |
4490 | assert(ksess); | |
4491 | assert(output); | |
4492 | assert(session); | |
4493 | ||
348a81dc JG |
4494 | status = kernel_snapshot_record( |
4495 | ksess, output, wait, nb_packets_per_stream); | |
9a654598 | 4496 | return status; |
6dc3064a DG |
4497 | } |
4498 | ||
4499 | /* | |
4500 | * Record a UST snapshot. | |
4501 | * | |
9a654598 | 4502 | * Returns LTTNG_OK on success or a LTTNG_ERR error code. |
6dc3064a | 4503 | */ |
9a654598 | 4504 | static enum lttng_error_code record_ust_snapshot(struct ltt_ust_session *usess, |
348a81dc JG |
4505 | const struct consumer_output *output, |
4506 | const struct ltt_session *session, | |
4507 | int wait, uint64_t nb_packets_per_stream) | |
6dc3064a | 4508 | { |
9a654598 | 4509 | enum lttng_error_code status; |
6dc3064a DG |
4510 | |
4511 | assert(usess); | |
4512 | assert(output); | |
4513 | assert(session); | |
4514 | ||
348a81dc JG |
4515 | status = ust_app_snapshot_record( |
4516 | usess, output, wait, nb_packets_per_stream); | |
9a654598 | 4517 | return status; |
6dc3064a DG |
4518 | } |
4519 | ||
d07ceecd | 4520 | static |
fb9a95c4 JG |
4521 | uint64_t get_session_size_one_more_packet_per_stream( |
4522 | const struct ltt_session *session, uint64_t cur_nr_packets) | |
68808f4e | 4523 | { |
d07ceecd | 4524 | uint64_t tot_size = 0; |
68808f4e DG |
4525 | |
4526 | if (session->kernel_session) { | |
4527 | struct ltt_kernel_channel *chan; | |
fb9a95c4 JG |
4528 | const struct ltt_kernel_session *ksess = |
4529 | session->kernel_session; | |
68808f4e | 4530 | |
68808f4e | 4531 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
d07ceecd MD |
4532 | if (cur_nr_packets >= chan->channel->attr.num_subbuf) { |
4533 | /* | |
4534 | * Don't take channel into account if we | |
4535 | * already grab all its packets. | |
4536 | */ | |
4537 | continue; | |
68808f4e | 4538 | } |
d07ceecd MD |
4539 | tot_size += chan->channel->attr.subbuf_size |
4540 | * chan->stream_count; | |
68808f4e DG |
4541 | } |
4542 | } | |
4543 | ||
4544 | if (session->ust_session) { | |
fb9a95c4 | 4545 | const struct ltt_ust_session *usess = session->ust_session; |
68808f4e | 4546 | |
d07ceecd MD |
4547 | tot_size += ust_app_get_size_one_more_packet_per_stream(usess, |
4548 | cur_nr_packets); | |
68808f4e DG |
4549 | } |
4550 | ||
d07ceecd | 4551 | return tot_size; |
68808f4e DG |
4552 | } |
4553 | ||
5c786ded | 4554 | /* |
d07ceecd MD |
4555 | * Calculate the number of packets we can grab from each stream that |
4556 | * fits within the overall snapshot max size. | |
4557 | * | |
4558 | * Returns -1 on error, 0 means infinite number of packets, else > 0 is | |
4559 | * the number of packets per stream. | |
4560 | * | |
4561 | * TODO: this approach is not perfect: we consider the worse case | |
4562 | * (packet filling the sub-buffers) as an upper bound, but we could do | |
4563 | * better if we do this calculation while we actually grab the packet | |
4564 | * content: we would know how much padding we don't actually store into | |
4565 | * the file. | |
4566 | * | |
4567 | * This algorithm is currently bounded by the number of packets per | |
4568 | * stream. | |
4569 | * | |
4570 | * Since we call this algorithm before actually grabbing the data, it's | |
4571 | * an approximation: for instance, applications could appear/disappear | |
4572 | * in between this call and actually grabbing data. | |
5c786ded | 4573 | */ |
d07ceecd | 4574 | static |
fb9a95c4 JG |
4575 | int64_t get_session_nb_packets_per_stream(const struct ltt_session *session, |
4576 | uint64_t max_size) | |
5c786ded | 4577 | { |
d07ceecd MD |
4578 | int64_t size_left; |
4579 | uint64_t cur_nb_packets = 0; | |
5c786ded | 4580 | |
d07ceecd MD |
4581 | if (!max_size) { |
4582 | return 0; /* Infinite */ | |
5c786ded JD |
4583 | } |
4584 | ||
d07ceecd MD |
4585 | size_left = max_size; |
4586 | for (;;) { | |
4587 | uint64_t one_more_packet_tot_size; | |
5c786ded | 4588 | |
fb9a95c4 JG |
4589 | one_more_packet_tot_size = get_session_size_one_more_packet_per_stream( |
4590 | session, cur_nb_packets); | |
d07ceecd MD |
4591 | if (!one_more_packet_tot_size) { |
4592 | /* We are already grabbing all packets. */ | |
4593 | break; | |
4594 | } | |
4595 | size_left -= one_more_packet_tot_size; | |
4596 | if (size_left < 0) { | |
4597 | break; | |
4598 | } | |
4599 | cur_nb_packets++; | |
5c786ded | 4600 | } |
aecf2da5 | 4601 | if (!cur_nb_packets && size_left != max_size) { |
d07ceecd MD |
4602 | /* Not enough room to grab one packet of each stream, error. */ |
4603 | return -1; | |
4604 | } | |
4605 | return cur_nb_packets; | |
5c786ded JD |
4606 | } |
4607 | ||
fb9a95c4 | 4608 | static |
d2956687 | 4609 | enum lttng_error_code snapshot_record(struct ltt_session *session, |
fb9a95c4 JG |
4610 | const struct snapshot_output *snapshot_output, int wait) |
4611 | { | |
4612 | int64_t nb_packets_per_stream; | |
d2956687 | 4613 | char snapshot_chunk_name[LTTNG_NAME_MAX]; |
348a81dc JG |
4614 | int ret; |
4615 | enum lttng_error_code ret_code = LTTNG_OK; | |
d2956687 | 4616 | struct lttng_trace_chunk *snapshot_trace_chunk; |
348a81dc JG |
4617 | struct consumer_output *original_ust_consumer_output = NULL; |
4618 | struct consumer_output *original_kernel_consumer_output = NULL; | |
4619 | struct consumer_output *snapshot_ust_consumer_output = NULL; | |
4620 | struct consumer_output *snapshot_kernel_consumer_output = NULL; | |
d2956687 | 4621 | |
348a81dc | 4622 | ret = snprintf(snapshot_chunk_name, sizeof(snapshot_chunk_name), |
d2956687 JG |
4623 | "%s-%s-%" PRIu64, |
4624 | snapshot_output->name, | |
4625 | snapshot_output->datetime, | |
4626 | snapshot_output->nb_snapshot); | |
348a81dc | 4627 | if (ret < 0 || ret >= sizeof(snapshot_chunk_name)) { |
d2956687 | 4628 | ERR("Failed to format snapshot name"); |
348a81dc JG |
4629 | ret_code = LTTNG_ERR_INVALID; |
4630 | goto error; | |
d2956687 JG |
4631 | } |
4632 | DBG("Recording snapshot \"%s\" for session \"%s\" with chunk name \"%s\"", | |
4633 | snapshot_output->name, session->name, | |
4634 | snapshot_chunk_name); | |
348a81dc JG |
4635 | if (!session->kernel_session && !session->ust_session) { |
4636 | ERR("Failed to record snapshot as no channels exist"); | |
4637 | ret_code = LTTNG_ERR_NO_CHANNEL; | |
4638 | goto error; | |
4639 | } | |
4640 | ||
4641 | if (session->kernel_session) { | |
4642 | original_kernel_consumer_output = | |
4643 | session->kernel_session->consumer; | |
4644 | snapshot_kernel_consumer_output = | |
4645 | consumer_copy_output(snapshot_output->consumer); | |
3b967712 MD |
4646 | strcpy(snapshot_kernel_consumer_output->chunk_path, |
4647 | snapshot_chunk_name); | |
348a81dc JG |
4648 | ret = consumer_copy_sockets(snapshot_kernel_consumer_output, |
4649 | original_kernel_consumer_output); | |
4650 | if (ret < 0) { | |
4651 | ERR("Failed to copy consumer sockets from snapshot output configuration"); | |
4652 | ret_code = LTTNG_ERR_NOMEM; | |
4653 | goto error; | |
4654 | } | |
4655 | ret_code = set_relayd_for_snapshot( | |
4656 | snapshot_kernel_consumer_output, session); | |
4657 | if (ret_code != LTTNG_OK) { | |
4658 | ERR("Failed to setup relay daemon for kernel tracer snapshot"); | |
4659 | goto error; | |
4660 | } | |
4661 | session->kernel_session->consumer = | |
4662 | snapshot_kernel_consumer_output; | |
4663 | } | |
4664 | if (session->ust_session) { | |
4665 | original_ust_consumer_output = session->ust_session->consumer; | |
4666 | snapshot_ust_consumer_output = | |
4667 | consumer_copy_output(snapshot_output->consumer); | |
3b967712 MD |
4668 | strcpy(snapshot_ust_consumer_output->chunk_path, |
4669 | snapshot_chunk_name); | |
348a81dc JG |
4670 | ret = consumer_copy_sockets(snapshot_ust_consumer_output, |
4671 | original_ust_consumer_output); | |
4672 | if (ret < 0) { | |
4673 | ERR("Failed to copy consumer sockets from snapshot output configuration"); | |
4674 | ret_code = LTTNG_ERR_NOMEM; | |
4675 | goto error; | |
4676 | } | |
4677 | ret_code = set_relayd_for_snapshot( | |
4678 | snapshot_ust_consumer_output, session); | |
4679 | if (ret_code != LTTNG_OK) { | |
4680 | ERR("Failed to setup relay daemon for userspace tracer snapshot"); | |
4681 | goto error; | |
4682 | } | |
4683 | session->ust_session->consumer = | |
4684 | snapshot_ust_consumer_output; | |
4685 | } | |
4686 | ||
d2956687 | 4687 | snapshot_trace_chunk = session_create_new_trace_chunk(session, |
348a81dc JG |
4688 | snapshot_kernel_consumer_output ?: |
4689 | snapshot_ust_consumer_output, | |
4690 | consumer_output_get_base_path( | |
4691 | snapshot_output->consumer), | |
d2956687 JG |
4692 | snapshot_chunk_name); |
4693 | if (!snapshot_trace_chunk) { | |
348a81dc JG |
4694 | ERR("Failed to create temporary trace chunk to record a snapshot of session \"%s\"", |
4695 | session->name); | |
4696 | ret_code = LTTNG_ERR_CREATE_DIR_FAIL; | |
4697 | goto error; | |
d2956687 JG |
4698 | } |
4699 | assert(!session->current_trace_chunk); | |
4700 | ret = session_set_trace_chunk(session, snapshot_trace_chunk, NULL); | |
4701 | lttng_trace_chunk_put(snapshot_trace_chunk); | |
4702 | snapshot_trace_chunk = NULL; | |
4703 | if (ret) { | |
348a81dc JG |
4704 | ERR("Failed to set temporary trace chunk to record a snapshot of session \"%s\"", |
4705 | session->name); | |
4706 | ret_code = LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER; | |
4707 | goto error; | |
d2956687 | 4708 | } |
fb9a95c4 JG |
4709 | |
4710 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
4711 | snapshot_output->max_size); | |
4712 | if (nb_packets_per_stream < 0) { | |
348a81dc | 4713 | ret_code = LTTNG_ERR_MAX_SIZE_INVALID; |
5151d412 | 4714 | goto error_close_trace_chunk; |
fb9a95c4 JG |
4715 | } |
4716 | ||
4717 | if (session->kernel_session) { | |
348a81dc JG |
4718 | ret_code = record_kernel_snapshot(session->kernel_session, |
4719 | snapshot_kernel_consumer_output, session, | |
fb9a95c4 | 4720 | wait, nb_packets_per_stream); |
348a81dc | 4721 | if (ret_code != LTTNG_OK) { |
5151d412 | 4722 | goto error_close_trace_chunk; |
fb9a95c4 JG |
4723 | } |
4724 | } | |
4725 | ||
4726 | if (session->ust_session) { | |
348a81dc JG |
4727 | ret_code = record_ust_snapshot(session->ust_session, |
4728 | snapshot_ust_consumer_output, session, | |
fb9a95c4 | 4729 | wait, nb_packets_per_stream); |
348a81dc | 4730 | if (ret_code != LTTNG_OK) { |
5151d412 | 4731 | goto error_close_trace_chunk; |
fb9a95c4 JG |
4732 | } |
4733 | } | |
d2956687 | 4734 | |
5151d412 | 4735 | error_close_trace_chunk: |
dbfee52c MD |
4736 | if (session_set_trace_chunk(session, NULL, &snapshot_trace_chunk)) { |
4737 | ERR("Failed to release the current trace chunk of session \"%s\"", | |
4738 | session->name); | |
4739 | ret_code = LTTNG_ERR_UNK; | |
4740 | } | |
4741 | ||
4742 | if (session_close_trace_chunk(session, snapshot_trace_chunk, | |
343defc2 | 4743 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION, NULL)) { |
d2956687 JG |
4744 | /* |
4745 | * Don't goto end; make sure the chunk is closed for the session | |
4746 | * to allow future snapshots. | |
4747 | */ | |
4748 | ERR("Failed to close snapshot trace chunk of session \"%s\"", | |
4749 | session->name); | |
348a81dc | 4750 | ret_code = LTTNG_ERR_CLOSE_TRACE_CHUNK_FAIL_CONSUMER; |
d2956687 | 4751 | } |
348a81dc JG |
4752 | error: |
4753 | if (original_ust_consumer_output) { | |
4754 | session->ust_session->consumer = original_ust_consumer_output; | |
4755 | } | |
4756 | if (original_kernel_consumer_output) { | |
4757 | session->kernel_session->consumer = | |
4758 | original_kernel_consumer_output; | |
4759 | } | |
4760 | consumer_output_put(snapshot_ust_consumer_output); | |
4761 | consumer_output_put(snapshot_kernel_consumer_output); | |
4762 | return ret_code; | |
fb9a95c4 JG |
4763 | } |
4764 | ||
6dc3064a DG |
4765 | /* |
4766 | * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl. | |
4767 | * | |
4768 | * The wait parameter is ignored so this call always wait for the snapshot to | |
4769 | * complete before returning. | |
4770 | * | |
4771 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
4772 | */ | |
4773 | int cmd_snapshot_record(struct ltt_session *session, | |
df4f5a87 | 4774 | const struct lttng_snapshot_output *output, int wait) |
6dc3064a | 4775 | { |
9a654598 JG |
4776 | enum lttng_error_code cmd_ret = LTTNG_OK; |
4777 | int ret; | |
00e1dfc4 | 4778 | unsigned int snapshot_success = 0; |
10ba83fe | 4779 | char datetime[16]; |
2abe7969 | 4780 | struct snapshot_output *tmp_output = NULL; |
6dc3064a DG |
4781 | |
4782 | assert(session); | |
ba45d9f0 | 4783 | assert(output); |
6dc3064a DG |
4784 | |
4785 | DBG("Cmd snapshot record for session %s", session->name); | |
4786 | ||
10ba83fe JR |
4787 | /* Get the datetime for the snapshot output directory. */ |
4788 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", datetime, | |
4789 | sizeof(datetime)); | |
4790 | if (!ret) { | |
9a654598 | 4791 | cmd_ret = LTTNG_ERR_INVALID; |
10ba83fe JR |
4792 | goto error; |
4793 | } | |
4794 | ||
6dc3064a | 4795 | /* |
d3f14b8a MD |
4796 | * Permission denied to create an output if the session is not |
4797 | * set in no output mode. | |
6dc3064a DG |
4798 | */ |
4799 | if (session->output_traces) { | |
9a654598 | 4800 | cmd_ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
4801 | goto error; |
4802 | } | |
4803 | ||
4804 | /* The session needs to be started at least once. */ | |
8382cf6f | 4805 | if (!session->has_been_started) { |
9a654598 | 4806 | cmd_ret = LTTNG_ERR_START_SESSION_ONCE; |
6dc3064a DG |
4807 | goto error; |
4808 | } | |
4809 | ||
4810 | /* Use temporary output for the session. */ | |
ba45d9f0 | 4811 | if (*output->ctrl_url != '\0') { |
2abe7969 JG |
4812 | tmp_output = snapshot_output_alloc(); |
4813 | if (!tmp_output) { | |
4814 | cmd_ret = LTTNG_ERR_NOMEM; | |
4815 | goto error; | |
4816 | } | |
4817 | ||
b178f53e JG |
4818 | ret = snapshot_output_init(session, output->max_size, |
4819 | output->name, | |
4820 | output->ctrl_url, output->data_url, | |
4821 | session->consumer, | |
2abe7969 | 4822 | tmp_output, NULL); |
6dc3064a DG |
4823 | if (ret < 0) { |
4824 | if (ret == -ENOMEM) { | |
9a654598 | 4825 | cmd_ret = LTTNG_ERR_NOMEM; |
6dc3064a | 4826 | } else { |
9a654598 | 4827 | cmd_ret = LTTNG_ERR_INVALID; |
6dc3064a DG |
4828 | } |
4829 | goto error; | |
4830 | } | |
1bfe7328 | 4831 | /* Use the global session count for the temporary snapshot. */ |
2abe7969 | 4832 | tmp_output->nb_snapshot = session->snapshot.nb_snapshot; |
10ba83fe JR |
4833 | |
4834 | /* Use the global datetime */ | |
2abe7969 JG |
4835 | memcpy(tmp_output->datetime, datetime, sizeof(datetime)); |
4836 | cmd_ret = snapshot_record(session, tmp_output, wait); | |
fb9a95c4 | 4837 | if (cmd_ret != LTTNG_OK) { |
804c90a8 JR |
4838 | goto error; |
4839 | } | |
804c90a8 JR |
4840 | snapshot_success = 1; |
4841 | } else { | |
4842 | struct snapshot_output *sout; | |
4843 | struct lttng_ht_iter iter; | |
68808f4e | 4844 | |
804c90a8 JR |
4845 | rcu_read_lock(); |
4846 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
4847 | &iter.iter, sout, node.node) { | |
2abe7969 JG |
4848 | struct snapshot_output output_copy; |
4849 | ||
804c90a8 | 4850 | /* |
2abe7969 JG |
4851 | * Make a local copy of the output and override output |
4852 | * parameters with those provided as part of the | |
4853 | * command. | |
804c90a8 | 4854 | */ |
2abe7969 | 4855 | memcpy(&output_copy, sout, sizeof(output_copy)); |
1bfe7328 | 4856 | |
804c90a8 | 4857 | if (output->max_size != (uint64_t) -1ULL) { |
2abe7969 | 4858 | output_copy.max_size = output->max_size; |
6dc3064a | 4859 | } |
d07ceecd | 4860 | |
2abe7969 JG |
4861 | output_copy.nb_snapshot = session->snapshot.nb_snapshot; |
4862 | memcpy(output_copy.datetime, datetime, | |
4863 | sizeof(datetime)); | |
6dc3064a | 4864 | |
804c90a8 JR |
4865 | /* Use temporary name. */ |
4866 | if (*output->name != '\0') { | |
2abe7969 JG |
4867 | if (lttng_strncpy(output_copy.name, |
4868 | output->name, | |
4869 | sizeof(output_copy.name))) { | |
9a654598 | 4870 | cmd_ret = LTTNG_ERR_INVALID; |
cf3e357d MD |
4871 | rcu_read_unlock(); |
4872 | goto error; | |
4873 | } | |
804c90a8 | 4874 | } |
e1986656 | 4875 | |
2abe7969 | 4876 | cmd_ret = snapshot_record(session, &output_copy, wait); |
fb9a95c4 JG |
4877 | if (cmd_ret != LTTNG_OK) { |
4878 | rcu_read_unlock(); | |
4879 | goto error; | |
6dc3064a | 4880 | } |
804c90a8 | 4881 | snapshot_success = 1; |
6dc3064a | 4882 | } |
804c90a8 | 4883 | rcu_read_unlock(); |
6dc3064a DG |
4884 | } |
4885 | ||
1bfe7328 DG |
4886 | if (snapshot_success) { |
4887 | session->snapshot.nb_snapshot++; | |
b67578cb | 4888 | } else { |
9a654598 | 4889 | cmd_ret = LTTNG_ERR_SNAPSHOT_FAIL; |
1bfe7328 DG |
4890 | } |
4891 | ||
6dc3064a | 4892 | error: |
2abe7969 JG |
4893 | if (tmp_output) { |
4894 | snapshot_output_destroy(tmp_output); | |
4895 | } | |
9a654598 | 4896 | return cmd_ret; |
6dc3064a DG |
4897 | } |
4898 | ||
d7ba1388 MD |
4899 | /* |
4900 | * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread. | |
4901 | */ | |
4902 | int cmd_set_session_shm_path(struct ltt_session *session, | |
4903 | const char *shm_path) | |
4904 | { | |
4905 | /* Safety net */ | |
4906 | assert(session); | |
4907 | ||
4908 | /* | |
4909 | * Can only set shm path before session is started. | |
4910 | */ | |
4911 | if (session->has_been_started) { | |
4912 | return LTTNG_ERR_SESSION_STARTED; | |
4913 | } | |
4914 | ||
4915 | strncpy(session->shm_path, shm_path, | |
4916 | sizeof(session->shm_path)); | |
4917 | session->shm_path[sizeof(session->shm_path) - 1] = '\0'; | |
4918 | ||
4919 | return 0; | |
4920 | } | |
4921 | ||
5c408ad8 JD |
4922 | /* |
4923 | * Command LTTNG_ROTATE_SESSION from the lttng-ctl library. | |
4924 | * | |
4925 | * Ask the consumer to rotate the session output directory. | |
4926 | * The session lock must be held. | |
4927 | * | |
d5a1b7aa | 4928 | * Returns LTTNG_OK on success or else a negative LTTng error code. |
5c408ad8 JD |
4929 | */ |
4930 | int cmd_rotate_session(struct ltt_session *session, | |
7fdbed1c | 4931 | struct lttng_rotate_session_return *rotate_return, |
343defc2 MD |
4932 | bool quiet_rotation, |
4933 | enum lttng_trace_chunk_command_type command) | |
5c408ad8 JD |
4934 | { |
4935 | int ret; | |
d2956687 | 4936 | uint64_t ongoing_rotation_chunk_id; |
d5a1b7aa | 4937 | enum lttng_error_code cmd_ret = LTTNG_OK; |
d2956687 JG |
4938 | struct lttng_trace_chunk *chunk_being_archived = NULL; |
4939 | struct lttng_trace_chunk *new_trace_chunk = NULL; | |
4940 | enum lttng_trace_chunk_status chunk_status; | |
3156892b JG |
4941 | bool failed_to_rotate = false; |
4942 | enum lttng_error_code rotation_fail_code = LTTNG_OK; | |
5c408ad8 JD |
4943 | |
4944 | assert(session); | |
4945 | ||
4946 | if (!session->has_been_started) { | |
d5a1b7aa | 4947 | cmd_ret = LTTNG_ERR_START_SESSION_ONCE; |
d68c9a04 | 4948 | goto end; |
5c408ad8 JD |
4949 | } |
4950 | ||
d48d65e1 MD |
4951 | /* |
4952 | * Explicit rotation is not supported for live sessions. | |
4953 | * However, live sessions can perform a quiet rotation on | |
4954 | * destroy. | |
4955 | * Rotation is not supported for snapshot traces (no output). | |
4956 | */ | |
4957 | if ((!quiet_rotation && session->live_timer) || | |
4958 | !session->output_traces) { | |
d5a1b7aa | 4959 | cmd_ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE; |
d68c9a04 | 4960 | goto end; |
5c408ad8 JD |
4961 | } |
4962 | ||
d2956687 | 4963 | /* Unsupported feature in lttng-relayd before 2.11. */ |
070b6a86 | 4964 | if (!quiet_rotation && session->consumer->type == CONSUMER_DST_NET && |
5c408ad8 JD |
4965 | (session->consumer->relay_major_version == 2 && |
4966 | session->consumer->relay_minor_version < 11)) { | |
d5a1b7aa | 4967 | cmd_ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE_RELAY; |
d68c9a04 | 4968 | goto end; |
5c408ad8 JD |
4969 | } |
4970 | ||
a40a503f MD |
4971 | /* Unsupported feature in lttng-modules before 2.8 (lack of sequence number). */ |
4972 | if (session->kernel_session && !kernel_supports_ring_buffer_packet_sequence_number()) { | |
4973 | cmd_ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE_KERNEL; | |
4974 | goto end; | |
4975 | } | |
4976 | ||
92816cc3 | 4977 | if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) { |
92816cc3 JG |
4978 | DBG("Refusing to launch a rotation; a rotation is already in progress for session %s", |
4979 | session->name); | |
d5a1b7aa | 4980 | cmd_ret = LTTNG_ERR_ROTATION_PENDING; |
d68c9a04 | 4981 | goto end; |
5c408ad8 JD |
4982 | } |
4983 | ||
4984 | /* | |
4985 | * After a stop, we only allow one rotation to occur, the other ones are | |
4986 | * useless until a new start. | |
4987 | */ | |
4988 | if (session->rotated_after_last_stop) { | |
4989 | DBG("Session \"%s\" was already rotated after stop, refusing rotation", | |
4990 | session->name); | |
d5a1b7aa | 4991 | cmd_ret = LTTNG_ERR_ROTATION_MULTIPLE_AFTER_STOP; |
d68c9a04 | 4992 | goto end; |
5c408ad8 | 4993 | } |
b02f5986 MD |
4994 | |
4995 | /* | |
4996 | * After a stop followed by a clear, disallow following rotations a they would | |
4997 | * generate empty chunks. | |
4998 | */ | |
4999 | if (session->cleared_after_last_stop) { | |
5000 | DBG("Session \"%s\" was already cleared after stop, refusing rotation", | |
5001 | session->name); | |
5002 | cmd_ret = LTTNG_ERR_ROTATION_AFTER_STOP_CLEAR; | |
5003 | goto end; | |
5004 | } | |
5005 | ||
d2956687 | 5006 | if (session->active) { |
348a81dc | 5007 | new_trace_chunk = session_create_new_trace_chunk(session, NULL, |
d2956687 JG |
5008 | NULL, NULL); |
5009 | if (!new_trace_chunk) { | |
5010 | cmd_ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
5011 | goto error; | |
5c408ad8 | 5012 | } |
d2956687 | 5013 | } |
2961f09e | 5014 | |
3156892b JG |
5015 | /* |
5016 | * The current trace chunk becomes the chunk being archived. | |
5017 | * | |
5018 | * After this point, "chunk_being_archived" must absolutely | |
5019 | * be closed on the consumer(s), otherwise it will never be | |
5020 | * cleaned-up, which will result in a leak. | |
5021 | */ | |
d2956687 JG |
5022 | ret = session_set_trace_chunk(session, new_trace_chunk, |
5023 | &chunk_being_archived); | |
5024 | if (ret) { | |
5025 | cmd_ret = LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER; | |
b178f53e JG |
5026 | goto error; |
5027 | } | |
5028 | ||
5c408ad8 | 5029 | if (session->kernel_session) { |
d5a1b7aa JG |
5030 | cmd_ret = kernel_rotate_session(session); |
5031 | if (cmd_ret != LTTNG_OK) { | |
3156892b JG |
5032 | failed_to_rotate = true; |
5033 | rotation_fail_code = cmd_ret; | |
5c408ad8 JD |
5034 | } |
5035 | } | |
5036 | if (session->ust_session) { | |
d5a1b7aa JG |
5037 | cmd_ret = ust_app_rotate_session(session); |
5038 | if (cmd_ret != LTTNG_OK) { | |
3156892b JG |
5039 | failed_to_rotate = true; |
5040 | rotation_fail_code = cmd_ret; | |
5c408ad8 | 5041 | } |
92816cc3 | 5042 | } |
17dd1232 | 5043 | |
3b61d9ee JG |
5044 | if (!session->active) { |
5045 | session->rotated_after_last_stop = true; | |
5046 | } | |
5047 | ||
5048 | if (!chunk_being_archived) { | |
5049 | DBG("Rotating session \"%s\" from a \"NULL\" trace chunk to a new trace chunk, skipping completion check", | |
5050 | session->name); | |
5051 | if (failed_to_rotate) { | |
5052 | cmd_ret = rotation_fail_code; | |
5053 | goto error; | |
5054 | } | |
5055 | cmd_ret = LTTNG_OK; | |
5056 | goto end; | |
5057 | } | |
5058 | ||
5059 | session->rotation_state = LTTNG_ROTATION_STATE_ONGOING; | |
5060 | chunk_status = lttng_trace_chunk_get_id(chunk_being_archived, | |
5061 | &ongoing_rotation_chunk_id); | |
5062 | assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); | |
5063 | ||
bbc4768c | 5064 | ret = session_close_trace_chunk(session, chunk_being_archived, |
343defc2 | 5065 | command, session->last_chunk_path); |
d2956687 JG |
5066 | if (ret) { |
5067 | cmd_ret = LTTNG_ERR_CLOSE_TRACE_CHUNK_FAIL_CONSUMER; | |
5068 | goto error; | |
5069 | } | |
5070 | ||
3156892b JG |
5071 | if (failed_to_rotate) { |
5072 | cmd_ret = rotation_fail_code; | |
5073 | goto error; | |
5074 | } | |
5075 | ||
7fdbed1c | 5076 | session->quiet_rotation = quiet_rotation; |
92816cc3 JG |
5077 | ret = timer_session_rotation_pending_check_start(session, |
5078 | DEFAULT_ROTATE_PENDING_TIMER); | |
5079 | if (ret) { | |
d5a1b7aa | 5080 | cmd_ret = LTTNG_ERR_UNK; |
2961f09e | 5081 | goto error; |
5c408ad8 JD |
5082 | } |
5083 | ||
5c408ad8 | 5084 | if (rotate_return) { |
d2956687 | 5085 | rotate_return->rotation_id = ongoing_rotation_chunk_id; |
5c408ad8 JD |
5086 | } |
5087 | ||
d2956687 JG |
5088 | session->chunk_being_archived = chunk_being_archived; |
5089 | chunk_being_archived = NULL; | |
7fdbed1c JG |
5090 | if (!quiet_rotation) { |
5091 | ret = notification_thread_command_session_rotation_ongoing( | |
5092 | notification_thread_handle, | |
5093 | session->name, session->uid, session->gid, | |
5094 | ongoing_rotation_chunk_id); | |
5095 | if (ret != LTTNG_OK) { | |
5096 | ERR("Failed to notify notification thread that a session rotation is ongoing for session %s", | |
5097 | session->name); | |
5098 | cmd_ret = ret; | |
5099 | } | |
2961f09e JG |
5100 | } |
5101 | ||
92816cc3 | 5102 | DBG("Cmd rotate session %s, archive_id %" PRIu64 " sent", |
d2956687 | 5103 | session->name, ongoing_rotation_chunk_id); |
5c408ad8 | 5104 | end: |
d2956687 JG |
5105 | lttng_trace_chunk_put(new_trace_chunk); |
5106 | lttng_trace_chunk_put(chunk_being_archived); | |
d5a1b7aa | 5107 | ret = (cmd_ret == LTTNG_OK) ? cmd_ret : -((int) cmd_ret); |
5c408ad8 | 5108 | return ret; |
2961f09e | 5109 | error: |
2961f09e | 5110 | if (session_reset_rotation_state(session, |
d2956687 | 5111 | LTTNG_ROTATION_STATE_ERROR)) { |
2961f09e JG |
5112 | ERR("Failed to reset rotation state of session \"%s\"", |
5113 | session->name); | |
5114 | } | |
5115 | goto end; | |
5c408ad8 JD |
5116 | } |
5117 | ||
5118 | /* | |
d68c9a04 | 5119 | * Command LTTNG_ROTATION_GET_INFO from the lttng-ctl library. |
5c408ad8 JD |
5120 | * |
5121 | * Check if the session has finished its rotation. | |
5122 | * | |
d2956687 | 5123 | * Return LTTNG_OK on success or else an LTTNG_ERR code. |
5c408ad8 | 5124 | */ |
d68c9a04 JD |
5125 | int cmd_rotate_get_info(struct ltt_session *session, |
5126 | struct lttng_rotation_get_info_return *info_return, | |
5127 | uint64_t rotation_id) | |
5c408ad8 | 5128 | { |
d2956687 JG |
5129 | enum lttng_error_code cmd_ret = LTTNG_OK; |
5130 | enum lttng_rotation_state rotation_state; | |
5c408ad8 | 5131 | |
d68c9a04 | 5132 | DBG("Cmd rotate_get_info session %s, rotation id %" PRIu64, session->name, |
d2956687 | 5133 | session->most_recent_chunk_id.value); |
5c408ad8 | 5134 | |
d2956687 JG |
5135 | if (session->chunk_being_archived) { |
5136 | enum lttng_trace_chunk_status chunk_status; | |
5137 | uint64_t chunk_id; | |
5138 | ||
5139 | chunk_status = lttng_trace_chunk_get_id( | |
5140 | session->chunk_being_archived, | |
5141 | &chunk_id); | |
5142 | assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); | |
5143 | ||
5144 | rotation_state = rotation_id == chunk_id ? | |
5145 | LTTNG_ROTATION_STATE_ONGOING : | |
5146 | LTTNG_ROTATION_STATE_EXPIRED; | |
5147 | } else { | |
5148 | if (session->last_archived_chunk_id.is_set && | |
5149 | rotation_id != session->last_archived_chunk_id.value) { | |
5150 | rotation_state = LTTNG_ROTATION_STATE_EXPIRED; | |
5151 | } else { | |
5152 | rotation_state = session->rotation_state; | |
5153 | } | |
5c408ad8 JD |
5154 | } |
5155 | ||
d2956687 JG |
5156 | switch (rotation_state) { |
5157 | case LTTNG_ROTATION_STATE_NO_ROTATION: | |
83ed9e90 | 5158 | DBG("Reporting that no rotation has occurred within the lifetime of session \"%s\"", |
d2956687 JG |
5159 | session->name); |
5160 | goto end; | |
5161 | case LTTNG_ROTATION_STATE_EXPIRED: | |
5162 | DBG("Reporting that the rotation state of rotation id %" PRIu64 " of session \"%s\" has expired", | |
5163 | rotation_id, session->name); | |
5164 | break; | |
d68c9a04 | 5165 | case LTTNG_ROTATION_STATE_ONGOING: |
d2956687 | 5166 | DBG("Reporting that rotation id %" PRIu64 " of session \"%s\" is still pending", |
d68c9a04 JD |
5167 | rotation_id, session->name); |
5168 | break; | |
5169 | case LTTNG_ROTATION_STATE_COMPLETED: | |
dd73d57b | 5170 | { |
d2956687 JG |
5171 | int fmt_ret; |
5172 | char *chunk_path; | |
dd73d57b JG |
5173 | char *current_tracing_path_reply; |
5174 | size_t current_tracing_path_reply_len; | |
5175 | ||
d2956687 JG |
5176 | DBG("Reporting that rotation id %" PRIu64 " of session \"%s\" is completed", |
5177 | rotation_id, session->name); | |
5178 | ||
dd73d57b JG |
5179 | switch (session_get_consumer_destination_type(session)) { |
5180 | case CONSUMER_DST_LOCAL: | |
5181 | current_tracing_path_reply = | |
5182 | info_return->location.local.absolute_path; | |
5183 | current_tracing_path_reply_len = | |
5184 | sizeof(info_return->location.local.absolute_path); | |
5185 | info_return->location_type = | |
05f8afa9 | 5186 | (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_LOCAL; |
ecd1a12f MD |
5187 | fmt_ret = asprintf(&chunk_path, |
5188 | "%s/" DEFAULT_ARCHIVED_TRACE_CHUNKS_DIRECTORY "/%s", | |
5189 | session_get_base_path(session), | |
5190 | session->last_archived_chunk_name); | |
5191 | if (fmt_ret == -1) { | |
5192 | PERROR("Failed to format the path of the last archived trace chunk"); | |
5193 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; | |
5194 | cmd_ret = LTTNG_ERR_UNK; | |
5195 | goto end; | |
5196 | } | |
dd73d57b JG |
5197 | break; |
5198 | case CONSUMER_DST_NET: | |
09cfbe47 JG |
5199 | { |
5200 | uint16_t ctrl_port, data_port; | |
5201 | ||
dd73d57b JG |
5202 | current_tracing_path_reply = |
5203 | info_return->location.relay.relative_path; | |
5204 | current_tracing_path_reply_len = | |
5205 | sizeof(info_return->location.relay.relative_path); | |
5206 | /* Currently the only supported relay protocol. */ | |
5207 | info_return->location.relay.protocol = | |
05f8afa9 | 5208 | (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_RELAY_PROTOCOL_TYPE_TCP; |
dd73d57b | 5209 | |
d2956687 | 5210 | fmt_ret = lttng_strncpy(info_return->location.relay.host, |
dd73d57b JG |
5211 | session_get_net_consumer_hostname(session), |
5212 | sizeof(info_return->location.relay.host)); | |
d2956687 JG |
5213 | if (fmt_ret) { |
5214 | ERR("Failed to copy host name to rotate_get_info reply"); | |
dd73d57b | 5215 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; |
d2956687 | 5216 | cmd_ret = LTTNG_ERR_SET_URL; |
dd73d57b JG |
5217 | goto end; |
5218 | } | |
5219 | ||
09cfbe47 JG |
5220 | session_get_net_consumer_ports(session, &ctrl_port, &data_port); |
5221 | info_return->location.relay.ports.control = ctrl_port; | |
5222 | info_return->location.relay.ports.data = data_port; | |
dd73d57b | 5223 | info_return->location_type = |
05f8afa9 | 5224 | (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_RELAY; |
ecd1a12f MD |
5225 | chunk_path = strdup(session->last_chunk_path); |
5226 | if (!chunk_path) { | |
5227 | ERR("Failed to allocate the path of the last archived trace chunk"); | |
5228 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; | |
5229 | cmd_ret = LTTNG_ERR_UNK; | |
5230 | goto end; | |
5231 | } | |
dd73d57b | 5232 | break; |
09cfbe47 | 5233 | } |
dd73d57b JG |
5234 | default: |
5235 | abort(); | |
5236 | } | |
d2956687 JG |
5237 | |
5238 | fmt_ret = lttng_strncpy(current_tracing_path_reply, | |
5239 | chunk_path, current_tracing_path_reply_len); | |
5240 | free(chunk_path); | |
5241 | if (fmt_ret) { | |
5242 | ERR("Failed to copy path of the last archived trace chunk to rotate_get_info reply"); | |
d68c9a04 | 5243 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; |
d2956687 | 5244 | cmd_ret = LTTNG_ERR_UNK; |
5c408ad8 JD |
5245 | goto end; |
5246 | } | |
dd73d57b | 5247 | |
d68c9a04 | 5248 | break; |
dd73d57b | 5249 | } |
d68c9a04 | 5250 | case LTTNG_ROTATION_STATE_ERROR: |
d2956687 | 5251 | DBG("Reporting that an error occurred during rotation %" PRIu64 " of session \"%s\"", |
d68c9a04 JD |
5252 | rotation_id, session->name); |
5253 | break; | |
5254 | default: | |
5255 | abort(); | |
5c408ad8 JD |
5256 | } |
5257 | ||
d2956687 | 5258 | cmd_ret = LTTNG_OK; |
5c408ad8 | 5259 | end: |
d2956687 JG |
5260 | info_return->status = (int32_t) rotation_state; |
5261 | return cmd_ret; | |
5c408ad8 JD |
5262 | } |
5263 | ||
259c2674 JD |
5264 | /* |
5265 | * Command LTTNG_ROTATION_SET_SCHEDULE from the lttng-ctl library. | |
5266 | * | |
5267 | * Configure the automatic rotation parameters. | |
66ea93b1 JG |
5268 | * 'activate' to true means activate the rotation schedule type with 'new_value'. |
5269 | * 'activate' to false means deactivate the rotation schedule and validate that | |
5270 | * 'new_value' has the same value as the currently active value. | |
259c2674 | 5271 | * |
66ea93b1 | 5272 | * Return 0 on success or else a positive LTTNG_ERR code. |
259c2674 JD |
5273 | */ |
5274 | int cmd_rotation_set_schedule(struct ltt_session *session, | |
66ea93b1 JG |
5275 | bool activate, enum lttng_rotation_schedule_type schedule_type, |
5276 | uint64_t new_value, | |
90936dcf | 5277 | struct notification_thread_handle *notification_thread_handle) |
259c2674 JD |
5278 | { |
5279 | int ret; | |
66ea93b1 | 5280 | uint64_t *parameter_value; |
259c2674 JD |
5281 | |
5282 | assert(session); | |
5283 | ||
5284 | DBG("Cmd rotate set schedule session %s", session->name); | |
5285 | ||
92fe5ca1 | 5286 | if (session->live_timer || !session->output_traces) { |
66ea93b1 | 5287 | DBG("Failing ROTATION_SET_SCHEDULE command as the rotation feature is not available for this session"); |
259c2674 JD |
5288 | ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE; |
5289 | goto end; | |
5290 | } | |
5291 | ||
66ea93b1 JG |
5292 | switch (schedule_type) { |
5293 | case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD: | |
5294 | parameter_value = &session->rotate_size; | |
5295 | break; | |
5296 | case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC: | |
5297 | parameter_value = &session->rotate_timer_period; | |
5298 | if (new_value >= UINT_MAX) { | |
5299 | DBG("Failing ROTATION_SET_SCHEDULE command as the value requested for a periodic rotation schedule is invalid: %" PRIu64 " > %u (UINT_MAX)", | |
5300 | new_value, UINT_MAX); | |
5301 | ret = LTTNG_ERR_INVALID; | |
5302 | goto end; | |
5303 | } | |
5304 | break; | |
5305 | default: | |
5306 | WARN("Failing ROTATION_SET_SCHEDULE command on unknown schedule type"); | |
5307 | ret = LTTNG_ERR_INVALID; | |
259c2674 | 5308 | goto end; |
66ea93b1 JG |
5309 | } |
5310 | ||
5311 | /* Improper use of the API. */ | |
5312 | if (new_value == -1ULL) { | |
5313 | WARN("Failing ROTATION_SET_SCHEDULE command as the value requested is -1"); | |
5314 | ret = LTTNG_ERR_INVALID; | |
259c2674 JD |
5315 | goto end; |
5316 | } | |
5317 | ||
66ea93b1 JG |
5318 | /* |
5319 | * As indicated in struct ltt_session's comments, a value of == 0 means | |
5320 | * this schedule rotation type is not in use. | |
5321 | * | |
5322 | * Reject the command if we were asked to activate a schedule that was | |
5323 | * already active. | |
5324 | */ | |
5325 | if (activate && *parameter_value != 0) { | |
5326 | DBG("Failing ROTATION_SET_SCHEDULE (activate) command as the schedule is already active"); | |
5327 | ret = LTTNG_ERR_ROTATION_SCHEDULE_SET; | |
90936dcf | 5328 | goto end; |
66ea93b1 JG |
5329 | } |
5330 | ||
5331 | /* | |
5332 | * Reject the command if we were asked to deactivate a schedule that was | |
5333 | * not active. | |
5334 | */ | |
5335 | if (!activate && *parameter_value == 0) { | |
5336 | DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as the schedule is already inactive"); | |
5337 | ret = LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET; | |
90936dcf JD |
5338 | goto end; |
5339 | } | |
5340 | ||
66ea93b1 JG |
5341 | /* |
5342 | * Reject the command if we were asked to deactivate a schedule that | |
5343 | * doesn't exist. | |
5344 | */ | |
5345 | if (!activate && *parameter_value != new_value) { | |
5346 | DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as an inexistant schedule was provided"); | |
5347 | ret = LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET; | |
5348 | goto end; | |
5349 | } | |
259c2674 | 5350 | |
66ea93b1 JG |
5351 | *parameter_value = activate ? new_value : 0; |
5352 | ||
5353 | switch (schedule_type) { | |
5354 | case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC: | |
5355 | if (activate && session->active) { | |
5356 | /* | |
5357 | * Only start the timer if the session is active, | |
5358 | * otherwise it will be started when the session starts. | |
5359 | */ | |
92816cc3 JG |
5360 | ret = timer_session_rotation_schedule_timer_start( |
5361 | session, new_value); | |
259c2674 | 5362 | if (ret) { |
66ea93b1 | 5363 | ERR("Failed to enable session rotation timer in ROTATION_SET_SCHEDULE command"); |
259c2674 JD |
5364 | ret = LTTNG_ERR_UNK; |
5365 | goto end; | |
5366 | } | |
66ea93b1 | 5367 | } else { |
92816cc3 JG |
5368 | ret = timer_session_rotation_schedule_timer_stop( |
5369 | session); | |
66ea93b1 JG |
5370 | if (ret) { |
5371 | ERR("Failed to disable session rotation timer in ROTATION_SET_SCHEDULE command"); | |
5372 | ret = LTTNG_ERR_UNK; | |
f3ce6946 | 5373 | goto end; |
66ea93b1 | 5374 | } |
259c2674 | 5375 | } |
66ea93b1 JG |
5376 | break; |
5377 | case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD: | |
5378 | if (activate) { | |
5379 | ret = subscribe_session_consumed_size_rotation(session, | |
5380 | new_value, notification_thread_handle); | |
90936dcf | 5381 | if (ret) { |
66ea93b1 | 5382 | ERR("Failed to enable consumed-size notification in ROTATION_SET_SCHEDULE command"); |
90936dcf JD |
5383 | ret = LTTNG_ERR_UNK; |
5384 | goto end; | |
5385 | } | |
90936dcf | 5386 | } else { |
66ea93b1 JG |
5387 | ret = unsubscribe_session_consumed_size_rotation(session, |
5388 | notification_thread_handle); | |
90936dcf | 5389 | if (ret) { |
66ea93b1 | 5390 | ERR("Failed to disable consumed-size notification in ROTATION_SET_SCHEDULE command"); |
90936dcf JD |
5391 | ret = LTTNG_ERR_UNK; |
5392 | goto end; | |
5393 | } | |
66ea93b1 | 5394 | |
90936dcf | 5395 | } |
66ea93b1 JG |
5396 | break; |
5397 | default: | |
5398 | /* Would have been caught before. */ | |
5399 | abort(); | |
90936dcf JD |
5400 | } |
5401 | ||
259c2674 JD |
5402 | ret = LTTNG_OK; |
5403 | ||
5404 | goto end; | |
5405 | ||
5406 | end: | |
5407 | return ret; | |
5408 | } | |
5409 | ||
a503e1ef JG |
5410 | /* Wait for a given path to be removed before continuing. */ |
5411 | static enum lttng_error_code wait_on_path(void *path_data) | |
5412 | { | |
5413 | const char *shm_path = path_data; | |
5414 | ||
5415 | DBG("Waiting for the shm path at %s to be removed before completing session destruction", | |
5416 | shm_path); | |
5417 | while (true) { | |
5418 | int ret; | |
5419 | struct stat st; | |
5420 | ||
5421 | ret = stat(shm_path, &st); | |
5422 | if (ret) { | |
5423 | if (errno != ENOENT) { | |
5424 | PERROR("stat() returned an error while checking for the existence of the shm path"); | |
5425 | } else { | |
5426 | DBG("shm path no longer exists, completing the destruction of session"); | |
5427 | } | |
5428 | break; | |
5429 | } else { | |
5430 | if (!S_ISDIR(st.st_mode)) { | |
5431 | ERR("The type of shm path %s returned by stat() is not a directory; aborting the wait for shm path removal", | |
5432 | shm_path); | |
5433 | break; | |
5434 | } | |
5435 | } | |
5436 | usleep(SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US); | |
5437 | } | |
5438 | return LTTNG_OK; | |
5439 | } | |
5440 | ||
5441 | /* | |
5442 | * Returns a pointer to a handler to run on completion of a command. | |
5443 | * Returns NULL if no handler has to be run for the last command executed. | |
5444 | */ | |
5445 | const struct cmd_completion_handler *cmd_pop_completion_handler(void) | |
5446 | { | |
5447 | struct cmd_completion_handler *handler = current_completion_handler; | |
5448 | ||
5449 | current_completion_handler = NULL; | |
5450 | return handler; | |
5451 | } | |
5452 | ||
2f77fc4b DG |
5453 | /* |
5454 | * Init command subsystem. | |
5455 | */ | |
5456 | void cmd_init(void) | |
5457 | { | |
5458 | /* | |
d88aee68 DG |
5459 | * Set network sequence index to 1 for streams to match a relayd |
5460 | * socket on the consumer side. | |
2f77fc4b | 5461 | */ |
d88aee68 DG |
5462 | pthread_mutex_lock(&relayd_net_seq_idx_lock); |
5463 | relayd_net_seq_idx = 1; | |
5464 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
5465 | |
5466 | DBG("Command subsystem initialized"); | |
5467 | } |