Commit | Line | Data |
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2f77fc4b DG |
1 | /* |
2 | * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com> | |
bdf64013 | 3 | * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
2f77fc4b DG |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License, version 2 only, as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
16 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | */ | |
18 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
2f77fc4b | 20 | #include <assert.h> |
6dc3064a | 21 | #include <inttypes.h> |
2f77fc4b DG |
22 | #include <urcu/list.h> |
23 | #include <urcu/uatomic.h> | |
24 | ||
25 | #include <common/defaults.h> | |
26 | #include <common/common.h> | |
27 | #include <common/sessiond-comm/sessiond-comm.h> | |
28 | #include <common/relayd/relayd.h> | |
10a50311 | 29 | #include <common/utils.h> |
f5436bfc | 30 | #include <common/compat/string.h> |
93ec662e | 31 | #include <common/kernel-ctl/kernel-ctl.h> |
2f77fc4b DG |
32 | |
33 | #include "channel.h" | |
34 | #include "consumer.h" | |
35 | #include "event.h" | |
8782cc74 | 36 | #include "health-sessiond.h" |
2f77fc4b DG |
37 | #include "kernel.h" |
38 | #include "kernel-consumer.h" | |
39 | #include "lttng-sessiond.h" | |
40 | #include "utils.h" | |
834978fd | 41 | #include "syscall.h" |
7c1d2758 | 42 | #include "agent.h" |
93ec662e | 43 | #include "buffer-registry.h" |
09a88287 | 44 | #include "agent-thread.h" |
2f77fc4b DG |
45 | |
46 | #include "cmd.h" | |
47 | ||
48 | /* | |
49 | * Used to keep a unique index for each relayd socket created where this value | |
50 | * is associated with streams on the consumer so it can match the right relayd | |
d88aee68 DG |
51 | * to send to. It must be accessed with the relayd_net_seq_idx_lock |
52 | * held. | |
2f77fc4b | 53 | */ |
d88aee68 DG |
54 | static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER; |
55 | static uint64_t relayd_net_seq_idx; | |
2f77fc4b | 56 | |
7076b56e JG |
57 | static int validate_event_name(const char *); |
58 | static int validate_ust_event_name(const char *); | |
59 | static int cmd_enable_event_internal(struct ltt_session *session, | |
60 | struct lttng_domain *domain, | |
61 | char *channel_name, struct lttng_event *event, | |
62 | char *filter_expression, | |
63 | struct lttng_filter_bytecode *filter, | |
64 | struct lttng_event_exclusion *exclusion, | |
65 | int wpipe); | |
66 | ||
2f77fc4b DG |
67 | /* |
68 | * Create a session path used by list_lttng_sessions for the case that the | |
69 | * session consumer is on the network. | |
70 | */ | |
71 | static int build_network_session_path(char *dst, size_t size, | |
72 | struct ltt_session *session) | |
73 | { | |
74 | int ret, kdata_port, udata_port; | |
75 | struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL; | |
76 | char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX]; | |
77 | ||
78 | assert(session); | |
79 | assert(dst); | |
80 | ||
81 | memset(tmp_urls, 0, sizeof(tmp_urls)); | |
82 | memset(tmp_uurl, 0, sizeof(tmp_uurl)); | |
83 | ||
84 | kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT; | |
85 | ||
86 | if (session->kernel_session && session->kernel_session->consumer) { | |
87 | kuri = &session->kernel_session->consumer->dst.net.control; | |
88 | kdata_port = session->kernel_session->consumer->dst.net.data.port; | |
89 | } | |
90 | ||
91 | if (session->ust_session && session->ust_session->consumer) { | |
92 | uuri = &session->ust_session->consumer->dst.net.control; | |
93 | udata_port = session->ust_session->consumer->dst.net.data.port; | |
94 | } | |
95 | ||
96 | if (uuri == NULL && kuri == NULL) { | |
97 | uri = &session->consumer->dst.net.control; | |
98 | kdata_port = session->consumer->dst.net.data.port; | |
99 | } else if (kuri && uuri) { | |
100 | ret = uri_compare(kuri, uuri); | |
101 | if (ret) { | |
102 | /* Not Equal */ | |
103 | uri = kuri; | |
104 | /* Build uuri URL string */ | |
105 | ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl)); | |
106 | if (ret < 0) { | |
107 | goto error; | |
108 | } | |
109 | } else { | |
110 | uri = kuri; | |
111 | } | |
112 | } else if (kuri && uuri == NULL) { | |
113 | uri = kuri; | |
114 | } else if (uuri && kuri == NULL) { | |
115 | uri = uuri; | |
116 | } | |
117 | ||
118 | ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls)); | |
119 | if (ret < 0) { | |
120 | goto error; | |
121 | } | |
122 | ||
9aa9f900 DG |
123 | /* |
124 | * Do we have a UST url set. If yes, this means we have both kernel and UST | |
125 | * to print. | |
126 | */ | |
9d035200 | 127 | if (*tmp_uurl != '\0') { |
2f77fc4b DG |
128 | ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]", |
129 | tmp_urls, kdata_port, tmp_uurl, udata_port); | |
130 | } else { | |
9aa9f900 | 131 | int dport; |
bef08707 | 132 | if (kuri || (!kuri && !uuri)) { |
9aa9f900 DG |
133 | dport = kdata_port; |
134 | } else { | |
135 | /* No kernel URI, use the UST port. */ | |
136 | dport = udata_port; | |
137 | } | |
138 | ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport); | |
2f77fc4b DG |
139 | } |
140 | ||
141 | error: | |
142 | return ret; | |
143 | } | |
144 | ||
fb83fe64 JD |
145 | /* |
146 | * Get run-time attributes if the session has been started (discarded events, | |
147 | * lost packets). | |
148 | */ | |
149 | static int get_kernel_runtime_stats(struct ltt_session *session, | |
150 | struct ltt_kernel_channel *kchan, uint64_t *discarded_events, | |
151 | uint64_t *lost_packets) | |
152 | { | |
153 | int ret; | |
154 | ||
155 | if (!session->has_been_started) { | |
156 | ret = 0; | |
157 | *discarded_events = 0; | |
158 | *lost_packets = 0; | |
159 | goto end; | |
160 | } | |
161 | ||
162 | ret = consumer_get_discarded_events(session->id, kchan->fd, | |
163 | session->kernel_session->consumer, | |
164 | discarded_events); | |
165 | if (ret < 0) { | |
166 | goto end; | |
167 | } | |
168 | ||
169 | ret = consumer_get_lost_packets(session->id, kchan->fd, | |
170 | session->kernel_session->consumer, | |
171 | lost_packets); | |
172 | if (ret < 0) { | |
173 | goto end; | |
174 | } | |
175 | ||
176 | end: | |
177 | return ret; | |
178 | } | |
179 | ||
180 | /* | |
181 | * Get run-time attributes if the session has been started (discarded events, | |
182 | * lost packets). | |
183 | */ | |
184 | static int get_ust_runtime_stats(struct ltt_session *session, | |
185 | struct ltt_ust_channel *uchan, uint64_t *discarded_events, | |
186 | uint64_t *lost_packets) | |
187 | { | |
188 | int ret; | |
189 | struct ltt_ust_session *usess; | |
190 | ||
a91c5803 JG |
191 | if (!discarded_events || !lost_packets) { |
192 | ret = -1; | |
193 | goto end; | |
194 | } | |
195 | ||
fb83fe64 | 196 | usess = session->ust_session; |
a905c624 JG |
197 | assert(discarded_events); |
198 | assert(lost_packets); | |
fb83fe64 JD |
199 | |
200 | if (!usess || !session->has_been_started) { | |
201 | *discarded_events = 0; | |
202 | *lost_packets = 0; | |
203 | ret = 0; | |
204 | goto end; | |
205 | } | |
206 | ||
207 | if (usess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
208 | ret = ust_app_uid_get_channel_runtime_stats(usess->id, | |
209 | &usess->buffer_reg_uid_list, | |
210 | usess->consumer, uchan->id, | |
211 | uchan->attr.overwrite, | |
212 | discarded_events, | |
213 | lost_packets); | |
214 | } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
215 | ret = ust_app_pid_get_channel_runtime_stats(usess, | |
216 | uchan, usess->consumer, | |
217 | uchan->attr.overwrite, | |
218 | discarded_events, | |
219 | lost_packets); | |
220 | if (ret < 0) { | |
221 | goto end; | |
222 | } | |
223 | *discarded_events += uchan->per_pid_closed_app_discarded; | |
224 | *lost_packets += uchan->per_pid_closed_app_lost; | |
225 | } else { | |
226 | ERR("Unsupported buffer type"); | |
967bc289 | 227 | assert(0); |
fb83fe64 JD |
228 | ret = -1; |
229 | goto end; | |
230 | } | |
231 | ||
232 | end: | |
233 | return ret; | |
234 | } | |
235 | ||
2f77fc4b DG |
236 | /* |
237 | * Fill lttng_channel array of all channels. | |
238 | */ | |
24624ef2 | 239 | static ssize_t list_lttng_channels(enum lttng_domain_type domain, |
fb83fe64 JD |
240 | struct ltt_session *session, struct lttng_channel *channels, |
241 | struct lttcomm_channel_extended *chan_exts) | |
2f77fc4b | 242 | { |
24624ef2 | 243 | int i = 0, ret = 0; |
2f77fc4b DG |
244 | struct ltt_kernel_channel *kchan; |
245 | ||
246 | DBG("Listing channels for session %s", session->name); | |
247 | ||
248 | switch (domain) { | |
249 | case LTTNG_DOMAIN_KERNEL: | |
250 | /* Kernel channels */ | |
251 | if (session->kernel_session != NULL) { | |
252 | cds_list_for_each_entry(kchan, | |
253 | &session->kernel_session->channel_list.head, list) { | |
fb83fe64 JD |
254 | uint64_t discarded_events, lost_packets; |
255 | ||
256 | ret = get_kernel_runtime_stats(session, kchan, | |
257 | &discarded_events, &lost_packets); | |
258 | if (ret < 0) { | |
259 | goto end; | |
260 | } | |
2f77fc4b DG |
261 | /* Copy lttng_channel struct to array */ |
262 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
263 | channels[i].enabled = kchan->enabled; | |
fb83fe64 JD |
264 | chan_exts[i].discarded_events = |
265 | discarded_events; | |
266 | chan_exts[i].lost_packets = lost_packets; | |
2f77fc4b DG |
267 | i++; |
268 | } | |
269 | } | |
270 | break; | |
271 | case LTTNG_DOMAIN_UST: | |
272 | { | |
273 | struct lttng_ht_iter iter; | |
274 | struct ltt_ust_channel *uchan; | |
275 | ||
e7fe706f | 276 | rcu_read_lock(); |
2f77fc4b DG |
277 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
278 | &iter.iter, uchan, node.node) { | |
a91c5803 | 279 | uint64_t discarded_events = 0, lost_packets = 0; |
fb83fe64 | 280 | |
8ee609c8 MD |
281 | if (lttng_strncpy(channels[i].name, uchan->name, |
282 | LTTNG_SYMBOL_NAME_LEN)) { | |
283 | break; | |
284 | } | |
2f77fc4b DG |
285 | channels[i].attr.overwrite = uchan->attr.overwrite; |
286 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
287 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
288 | channels[i].attr.switch_timer_interval = | |
289 | uchan->attr.switch_timer_interval; | |
290 | channels[i].attr.read_timer_interval = | |
291 | uchan->attr.read_timer_interval; | |
292 | channels[i].enabled = uchan->enabled; | |
2f785fe7 DG |
293 | channels[i].attr.tracefile_size = uchan->tracefile_size; |
294 | channels[i].attr.tracefile_count = uchan->tracefile_count; | |
5e4435a4 JG |
295 | |
296 | /* | |
297 | * Map enum lttng_ust_output to enum lttng_event_output. | |
298 | */ | |
2f77fc4b DG |
299 | switch (uchan->attr.output) { |
300 | case LTTNG_UST_MMAP: | |
2f77fc4b DG |
301 | channels[i].attr.output = LTTNG_EVENT_MMAP; |
302 | break; | |
5e4435a4 JG |
303 | default: |
304 | /* | |
305 | * LTTNG_UST_MMAP is the only supported UST | |
306 | * output mode. | |
307 | */ | |
308 | assert(0); | |
309 | break; | |
2f77fc4b | 310 | } |
fb83fe64 JD |
311 | |
312 | ret = get_ust_runtime_stats(session, uchan, | |
313 | &discarded_events, &lost_packets); | |
314 | if (ret < 0) { | |
315 | break; | |
316 | } | |
317 | chan_exts[i].discarded_events = discarded_events; | |
318 | chan_exts[i].lost_packets = lost_packets; | |
2f77fc4b DG |
319 | i++; |
320 | } | |
e7fe706f | 321 | rcu_read_unlock(); |
2f77fc4b DG |
322 | break; |
323 | } | |
324 | default: | |
325 | break; | |
326 | } | |
fb83fe64 JD |
327 | |
328 | end: | |
24624ef2 MD |
329 | if (ret < 0) { |
330 | return -LTTNG_ERR_FATAL; | |
331 | } else { | |
332 | return LTTNG_OK; | |
333 | } | |
2f77fc4b DG |
334 | } |
335 | ||
b4e3ceb9 | 336 | static void increment_extended_len(const char *filter_expression, |
795d57ce | 337 | struct lttng_event_exclusion *exclusion, size_t *extended_len) |
b4e3ceb9 PP |
338 | { |
339 | *extended_len += sizeof(struct lttcomm_event_extended_header); | |
340 | ||
341 | if (filter_expression) { | |
342 | *extended_len += strlen(filter_expression) + 1; | |
343 | } | |
795d57ce PP |
344 | |
345 | if (exclusion) { | |
346 | *extended_len += exclusion->count * LTTNG_SYMBOL_NAME_LEN; | |
347 | } | |
b4e3ceb9 PP |
348 | } |
349 | ||
350 | static void append_extended_info(const char *filter_expression, | |
795d57ce | 351 | struct lttng_event_exclusion *exclusion, void **extended_at) |
b4e3ceb9 PP |
352 | { |
353 | struct lttcomm_event_extended_header extended_header; | |
354 | size_t filter_len = 0; | |
795d57ce | 355 | size_t nb_exclusions = 0; |
b4e3ceb9 PP |
356 | |
357 | if (filter_expression) { | |
358 | filter_len = strlen(filter_expression) + 1; | |
359 | } | |
360 | ||
795d57ce PP |
361 | if (exclusion) { |
362 | nb_exclusions = exclusion->count; | |
363 | } | |
364 | ||
365 | /* Set header fields */ | |
b4e3ceb9 | 366 | extended_header.filter_len = filter_len; |
795d57ce PP |
367 | extended_header.nb_exclusions = nb_exclusions; |
368 | ||
369 | /* Copy header */ | |
b4e3ceb9 PP |
370 | memcpy(*extended_at, &extended_header, sizeof(extended_header)); |
371 | *extended_at += sizeof(extended_header); | |
795d57ce PP |
372 | |
373 | /* Copy filter string */ | |
374 | if (filter_expression) { | |
375 | memcpy(*extended_at, filter_expression, filter_len); | |
376 | *extended_at += filter_len; | |
377 | } | |
378 | ||
379 | /* Copy exclusion names */ | |
380 | if (exclusion) { | |
381 | size_t len = nb_exclusions * LTTNG_SYMBOL_NAME_LEN; | |
382 | ||
383 | memcpy(*extended_at, &exclusion->names, len); | |
384 | *extended_at += len; | |
385 | } | |
b4e3ceb9 PP |
386 | } |
387 | ||
3c6a091f | 388 | /* |
022d91ba | 389 | * Create a list of agent domain events. |
3c6a091f DG |
390 | * |
391 | * Return number of events in list on success or else a negative value. | |
392 | */ | |
022d91ba | 393 | static int list_lttng_agent_events(struct agent *agt, |
b4e3ceb9 | 394 | struct lttng_event **events, size_t *total_size) |
3c6a091f DG |
395 | { |
396 | int i = 0, ret = 0; | |
397 | unsigned int nb_event = 0; | |
022d91ba | 398 | struct agent_event *event; |
3c6a091f DG |
399 | struct lttng_event *tmp_events; |
400 | struct lttng_ht_iter iter; | |
b4e3ceb9 PP |
401 | size_t extended_len = 0; |
402 | void *extended_at; | |
3c6a091f | 403 | |
022d91ba | 404 | assert(agt); |
3c6a091f DG |
405 | assert(events); |
406 | ||
022d91ba | 407 | DBG3("Listing agent events"); |
3c6a091f | 408 | |
e5bbf678 | 409 | rcu_read_lock(); |
022d91ba | 410 | nb_event = lttng_ht_get_count(agt->events); |
e5bbf678 | 411 | rcu_read_unlock(); |
3c6a091f DG |
412 | if (nb_event == 0) { |
413 | ret = nb_event; | |
b4e3ceb9 | 414 | *total_size = 0; |
3c6a091f DG |
415 | goto error; |
416 | } | |
417 | ||
b4e3ceb9 PP |
418 | /* Compute required extended infos size */ |
419 | extended_len = nb_event * sizeof(struct lttcomm_event_extended_header); | |
420 | ||
421 | /* | |
422 | * This is only valid because the commands which add events are | |
423 | * processed in the same thread as the listing. | |
424 | */ | |
425 | rcu_read_lock(); | |
426 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { | |
795d57ce PP |
427 | increment_extended_len(event->filter_expression, NULL, |
428 | &extended_len); | |
b4e3ceb9 PP |
429 | } |
430 | rcu_read_unlock(); | |
431 | ||
432 | *total_size = nb_event * sizeof(*tmp_events) + extended_len; | |
433 | tmp_events = zmalloc(*total_size); | |
3c6a091f | 434 | if (!tmp_events) { |
022d91ba | 435 | PERROR("zmalloc agent events session"); |
3c6a091f DG |
436 | ret = -LTTNG_ERR_FATAL; |
437 | goto error; | |
438 | } | |
439 | ||
b4e3ceb9 PP |
440 | extended_at = ((uint8_t *) tmp_events) + |
441 | nb_event * sizeof(struct lttng_event); | |
442 | ||
3c6a091f | 443 | rcu_read_lock(); |
022d91ba | 444 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
3c6a091f DG |
445 | strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name)); |
446 | tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0'; | |
447 | tmp_events[i].enabled = event->enabled; | |
2106efa0 | 448 | tmp_events[i].loglevel = event->loglevel_value; |
ff94328f | 449 | tmp_events[i].loglevel_type = event->loglevel_type; |
3c6a091f | 450 | i++; |
b4e3ceb9 PP |
451 | |
452 | /* Append extended info */ | |
795d57ce PP |
453 | append_extended_info(event->filter_expression, NULL, |
454 | &extended_at); | |
3c6a091f DG |
455 | } |
456 | rcu_read_unlock(); | |
457 | ||
458 | *events = tmp_events; | |
459 | ret = nb_event; | |
460 | ||
461 | error: | |
462 | assert(nb_event == i); | |
463 | return ret; | |
464 | } | |
465 | ||
2f77fc4b DG |
466 | /* |
467 | * Create a list of ust global domain events. | |
468 | */ | |
469 | static int list_lttng_ust_global_events(char *channel_name, | |
b4e3ceb9 PP |
470 | struct ltt_ust_domain_global *ust_global, |
471 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
472 | { |
473 | int i = 0, ret = 0; | |
474 | unsigned int nb_event = 0; | |
475 | struct lttng_ht_iter iter; | |
476 | struct lttng_ht_node_str *node; | |
477 | struct ltt_ust_channel *uchan; | |
478 | struct ltt_ust_event *uevent; | |
479 | struct lttng_event *tmp; | |
b4e3ceb9 PP |
480 | size_t extended_len = 0; |
481 | void *extended_at; | |
2f77fc4b DG |
482 | |
483 | DBG("Listing UST global events for channel %s", channel_name); | |
484 | ||
485 | rcu_read_lock(); | |
486 | ||
487 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); | |
488 | node = lttng_ht_iter_get_node_str(&iter); | |
489 | if (node == NULL) { | |
f73fabfd | 490 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
d31d3e8c | 491 | goto end; |
2f77fc4b DG |
492 | } |
493 | ||
494 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); | |
495 | ||
3c442be3 | 496 | nb_event = lttng_ht_get_count(uchan->events); |
2f77fc4b DG |
497 | if (nb_event == 0) { |
498 | ret = nb_event; | |
b4e3ceb9 | 499 | *total_size = 0; |
d31d3e8c | 500 | goto end; |
2f77fc4b DG |
501 | } |
502 | ||
503 | DBG3("Listing UST global %d events", nb_event); | |
504 | ||
b4e3ceb9 PP |
505 | /* Compute required extended infos size */ |
506 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { | |
507 | if (uevent->internal) { | |
508 | nb_event--; | |
509 | continue; | |
510 | } | |
511 | ||
512 | increment_extended_len(uevent->filter_expression, | |
795d57ce | 513 | uevent->exclusion, &extended_len); |
b4e3ceb9 | 514 | } |
d31d3e8c PP |
515 | if (nb_event == 0) { |
516 | /* All events are internal, skip. */ | |
517 | ret = 0; | |
518 | *total_size = 0; | |
519 | goto end; | |
520 | } | |
b4e3ceb9 PP |
521 | |
522 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
523 | tmp = zmalloc(*total_size); | |
2f77fc4b | 524 | if (tmp == NULL) { |
b12c38df JG |
525 | ret = -LTTNG_ERR_FATAL; |
526 | goto end; | |
2f77fc4b DG |
527 | } |
528 | ||
b4e3ceb9 PP |
529 | extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event); |
530 | ||
2f77fc4b | 531 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
3c442be3 JG |
532 | if (uevent->internal) { |
533 | /* This event should remain hidden from clients */ | |
3c442be3 JG |
534 | continue; |
535 | } | |
2f77fc4b DG |
536 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
537 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
538 | tmp[i].enabled = uevent->enabled; | |
539 | ||
540 | switch (uevent->attr.instrumentation) { | |
541 | case LTTNG_UST_TRACEPOINT: | |
542 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
543 | break; | |
544 | case LTTNG_UST_PROBE: | |
545 | tmp[i].type = LTTNG_EVENT_PROBE; | |
546 | break; | |
547 | case LTTNG_UST_FUNCTION: | |
548 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
549 | break; | |
550 | } | |
551 | ||
552 | tmp[i].loglevel = uevent->attr.loglevel; | |
553 | switch (uevent->attr.loglevel_type) { | |
554 | case LTTNG_UST_LOGLEVEL_ALL: | |
555 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
556 | break; | |
557 | case LTTNG_UST_LOGLEVEL_RANGE: | |
558 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; | |
559 | break; | |
560 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
561 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; | |
562 | break; | |
563 | } | |
564 | if (uevent->filter) { | |
565 | tmp[i].filter = 1; | |
566 | } | |
4634f12e JI |
567 | if (uevent->exclusion) { |
568 | tmp[i].exclusion = 1; | |
569 | } | |
2f77fc4b | 570 | i++; |
b4e3ceb9 PP |
571 | |
572 | /* Append extended info */ | |
795d57ce PP |
573 | append_extended_info(uevent->filter_expression, |
574 | uevent->exclusion, &extended_at); | |
2f77fc4b DG |
575 | } |
576 | ||
577 | ret = nb_event; | |
578 | *events = tmp; | |
d31d3e8c | 579 | end: |
2f77fc4b DG |
580 | rcu_read_unlock(); |
581 | return ret; | |
582 | } | |
583 | ||
584 | /* | |
585 | * Fill lttng_event array of all kernel events in the channel. | |
586 | */ | |
587 | static int list_lttng_kernel_events(char *channel_name, | |
b4e3ceb9 PP |
588 | struct ltt_kernel_session *kernel_session, |
589 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
590 | { |
591 | int i = 0, ret; | |
592 | unsigned int nb_event; | |
593 | struct ltt_kernel_event *event; | |
594 | struct ltt_kernel_channel *kchan; | |
b4e3ceb9 PP |
595 | size_t extended_len = 0; |
596 | void *extended_at; | |
2f77fc4b DG |
597 | |
598 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
599 | if (kchan == NULL) { | |
f73fabfd | 600 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
601 | goto error; |
602 | } | |
603 | ||
604 | nb_event = kchan->event_count; | |
605 | ||
606 | DBG("Listing events for channel %s", kchan->channel->name); | |
607 | ||
608 | if (nb_event == 0) { | |
b4e3ceb9 | 609 | *total_size = 0; |
834978fd | 610 | *events = NULL; |
db906c12 | 611 | goto end; |
2f77fc4b DG |
612 | } |
613 | ||
b4e3ceb9 PP |
614 | /* Compute required extended infos size */ |
615 | cds_list_for_each_entry(event, &kchan->events_list.head, list) { | |
795d57ce PP |
616 | increment_extended_len(event->filter_expression, NULL, |
617 | &extended_len); | |
b4e3ceb9 PP |
618 | } |
619 | ||
620 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
621 | *events = zmalloc(*total_size); | |
2f77fc4b | 622 | if (*events == NULL) { |
f73fabfd | 623 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
624 | goto error; |
625 | } | |
626 | ||
ab4aa612 | 627 | extended_at = ((void *) *events) + |
b4e3ceb9 PP |
628 | nb_event * sizeof(struct lttng_event); |
629 | ||
2f77fc4b DG |
630 | /* Kernel channels */ |
631 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
632 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
633 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
634 | (*events)[i].enabled = event->enabled; | |
00f992f2 JG |
635 | (*events)[i].filter = |
636 | (unsigned char) !!event->filter_expression; | |
2f77fc4b DG |
637 | |
638 | switch (event->event->instrumentation) { | |
639 | case LTTNG_KERNEL_TRACEPOINT: | |
640 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; | |
641 | break; | |
2f77fc4b | 642 | case LTTNG_KERNEL_KRETPROBE: |
1896972b DG |
643 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
644 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
645 | sizeof(struct lttng_kernel_kprobe)); | |
646 | break; | |
647 | case LTTNG_KERNEL_KPROBE: | |
2f77fc4b DG |
648 | (*events)[i].type = LTTNG_EVENT_PROBE; |
649 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
650 | sizeof(struct lttng_kernel_kprobe)); | |
651 | break; | |
652 | case LTTNG_KERNEL_FUNCTION: | |
653 | (*events)[i].type = LTTNG_EVENT_FUNCTION; | |
654 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
655 | sizeof(struct lttng_kernel_function)); | |
656 | break; | |
657 | case LTTNG_KERNEL_NOOP: | |
658 | (*events)[i].type = LTTNG_EVENT_NOOP; | |
659 | break; | |
660 | case LTTNG_KERNEL_SYSCALL: | |
661 | (*events)[i].type = LTTNG_EVENT_SYSCALL; | |
662 | break; | |
663 | case LTTNG_KERNEL_ALL: | |
664 | assert(0); | |
665 | break; | |
666 | } | |
667 | i++; | |
b4e3ceb9 PP |
668 | |
669 | /* Append extended info */ | |
795d57ce PP |
670 | append_extended_info(event->filter_expression, NULL, |
671 | &extended_at); | |
2f77fc4b DG |
672 | } |
673 | ||
db906c12 | 674 | end: |
2f77fc4b DG |
675 | return nb_event; |
676 | ||
677 | error: | |
f73fabfd DG |
678 | /* Negate the error code to differentiate the size from an error */ |
679 | return -ret; | |
2f77fc4b DG |
680 | } |
681 | ||
682 | /* | |
683 | * Add URI so the consumer output object. Set the correct path depending on the | |
684 | * domain adding the default trace directory. | |
685 | */ | |
686 | static int add_uri_to_consumer(struct consumer_output *consumer, | |
56a37563 JG |
687 | struct lttng_uri *uri, enum lttng_domain_type domain, |
688 | const char *session_name) | |
2f77fc4b | 689 | { |
f73fabfd | 690 | int ret = LTTNG_OK; |
2f77fc4b DG |
691 | const char *default_trace_dir; |
692 | ||
693 | assert(uri); | |
694 | ||
695 | if (consumer == NULL) { | |
696 | DBG("No consumer detected. Don't add URI. Stopping."); | |
f73fabfd | 697 | ret = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
698 | goto error; |
699 | } | |
700 | ||
701 | switch (domain) { | |
702 | case LTTNG_DOMAIN_KERNEL: | |
703 | default_trace_dir = DEFAULT_KERNEL_TRACE_DIR; | |
704 | break; | |
705 | case LTTNG_DOMAIN_UST: | |
706 | default_trace_dir = DEFAULT_UST_TRACE_DIR; | |
707 | break; | |
708 | default: | |
709 | /* | |
710 | * This case is possible is we try to add the URI to the global tracing | |
711 | * session consumer object which in this case there is no subdir. | |
712 | */ | |
713 | default_trace_dir = ""; | |
714 | } | |
715 | ||
716 | switch (uri->dtype) { | |
717 | case LTTNG_DST_IPV4: | |
718 | case LTTNG_DST_IPV6: | |
719 | DBG2("Setting network URI to consumer"); | |
720 | ||
df75acac DG |
721 | if (consumer->type == CONSUMER_DST_NET) { |
722 | if ((uri->stype == LTTNG_STREAM_CONTROL && | |
785d2d0d DG |
723 | consumer->dst.net.control_isset) || |
724 | (uri->stype == LTTNG_STREAM_DATA && | |
725 | consumer->dst.net.data_isset)) { | |
df75acac DG |
726 | ret = LTTNG_ERR_URL_EXIST; |
727 | goto error; | |
728 | } | |
729 | } else { | |
730 | memset(&consumer->dst.net, 0, sizeof(consumer->dst.net)); | |
785d2d0d DG |
731 | } |
732 | ||
df75acac DG |
733 | consumer->type = CONSUMER_DST_NET; |
734 | ||
2f77fc4b DG |
735 | /* Set URI into consumer output object */ |
736 | ret = consumer_set_network_uri(consumer, uri); | |
737 | if (ret < 0) { | |
a74934ba | 738 | ret = -ret; |
2f77fc4b DG |
739 | goto error; |
740 | } else if (ret == 1) { | |
741 | /* | |
742 | * URI was the same in the consumer so we do not append the subdir | |
743 | * again so to not duplicate output dir. | |
744 | */ | |
f86c9f4e | 745 | ret = LTTNG_OK; |
2f77fc4b DG |
746 | goto error; |
747 | } | |
748 | ||
749 | if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) { | |
750 | ret = consumer_set_subdir(consumer, session_name); | |
751 | if (ret < 0) { | |
f73fabfd | 752 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
753 | goto error; |
754 | } | |
755 | } | |
756 | ||
757 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
758 | /* On a new subdir, reappend the default trace dir. */ | |
c30ce0b3 CB |
759 | strncat(consumer->subdir, default_trace_dir, |
760 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
761 | DBG3("Append domain trace name to subdir %s", consumer->subdir); |
762 | } | |
763 | ||
764 | break; | |
765 | case LTTNG_DST_PATH: | |
766 | DBG2("Setting trace directory path from URI to %s", uri->dst.path); | |
767 | memset(consumer->dst.trace_path, 0, | |
768 | sizeof(consumer->dst.trace_path)); | |
9ac05d92 MD |
769 | /* Explicit length checks for strcpy and strcat. */ |
770 | if (strlen(uri->dst.path) + strlen(default_trace_dir) | |
771 | >= sizeof(consumer->dst.trace_path)) { | |
772 | ret = LTTNG_ERR_FATAL; | |
773 | goto error; | |
774 | } | |
775 | strcpy(consumer->dst.trace_path, uri->dst.path); | |
2f77fc4b | 776 | /* Append default trace dir */ |
9ac05d92 | 777 | strcat(consumer->dst.trace_path, default_trace_dir); |
2f77fc4b DG |
778 | /* Flag consumer as local. */ |
779 | consumer->type = CONSUMER_DST_LOCAL; | |
780 | break; | |
781 | } | |
782 | ||
a74934ba DG |
783 | ret = LTTNG_OK; |
784 | ||
2f77fc4b DG |
785 | error: |
786 | return ret; | |
787 | } | |
788 | ||
789 | /* | |
790 | * Init tracing by creating trace directory and sending fds kernel consumer. | |
791 | */ | |
792 | static int init_kernel_tracing(struct ltt_kernel_session *session) | |
793 | { | |
794 | int ret = 0; | |
795 | struct lttng_ht_iter iter; | |
796 | struct consumer_socket *socket; | |
797 | ||
798 | assert(session); | |
799 | ||
e7fe706f DG |
800 | rcu_read_lock(); |
801 | ||
2f77fc4b DG |
802 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { |
803 | cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter, | |
804 | socket, node.node) { | |
2f77fc4b | 805 | pthread_mutex_lock(socket->lock); |
f50f23d9 | 806 | ret = kernel_consumer_send_session(socket, session); |
2f77fc4b DG |
807 | pthread_mutex_unlock(socket->lock); |
808 | if (ret < 0) { | |
f73fabfd | 809 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
810 | goto error; |
811 | } | |
812 | } | |
813 | } | |
814 | ||
815 | error: | |
e7fe706f | 816 | rcu_read_unlock(); |
2f77fc4b DG |
817 | return ret; |
818 | } | |
819 | ||
820 | /* | |
821 | * Create a socket to the relayd using the URI. | |
822 | * | |
823 | * On success, the relayd_sock pointer is set to the created socket. | |
824 | * Else, it's stays untouched and a lttcomm error code is returned. | |
825 | */ | |
6151a90f | 826 | static int create_connect_relayd(struct lttng_uri *uri, |
b31610f2 JD |
827 | struct lttcomm_relayd_sock **relayd_sock, |
828 | struct consumer_output *consumer) | |
2f77fc4b DG |
829 | { |
830 | int ret; | |
6151a90f | 831 | struct lttcomm_relayd_sock *rsock; |
2f77fc4b | 832 | |
6151a90f JD |
833 | rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR, |
834 | RELAYD_VERSION_COMM_MINOR); | |
835 | if (!rsock) { | |
f73fabfd | 836 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
837 | goto error; |
838 | } | |
839 | ||
ffe60014 DG |
840 | /* |
841 | * Connect to relayd so we can proceed with a session creation. This call | |
842 | * can possibly block for an arbitrary amount of time to set the health | |
843 | * state to be in poll execution. | |
844 | */ | |
845 | health_poll_entry(); | |
6151a90f | 846 | ret = relayd_connect(rsock); |
ffe60014 | 847 | health_poll_exit(); |
2f77fc4b DG |
848 | if (ret < 0) { |
849 | ERR("Unable to reach lttng-relayd"); | |
f73fabfd | 850 | ret = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
851 | goto free_sock; |
852 | } | |
853 | ||
854 | /* Create socket for control stream. */ | |
855 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
856 | DBG3("Creating relayd stream socket from URI"); | |
857 | ||
858 | /* Check relayd version */ | |
6151a90f | 859 | ret = relayd_version_check(rsock); |
3071c8c7 JD |
860 | if (ret == LTTNG_ERR_RELAYD_VERSION_FAIL) { |
861 | goto close_sock; | |
862 | } else if (ret < 0) { | |
863 | ERR("Unable to reach lttng-relayd"); | |
864 | ret = LTTNG_ERR_RELAYD_CONNECT_FAIL; | |
2f77fc4b DG |
865 | goto close_sock; |
866 | } | |
b31610f2 JD |
867 | consumer->relay_major_version = rsock->major; |
868 | consumer->relay_minor_version = rsock->minor; | |
2f77fc4b DG |
869 | } else if (uri->stype == LTTNG_STREAM_DATA) { |
870 | DBG3("Creating relayd data socket from URI"); | |
871 | } else { | |
872 | /* Command is not valid */ | |
873 | ERR("Relayd invalid stream type: %d", uri->stype); | |
f73fabfd | 874 | ret = LTTNG_ERR_INVALID; |
2f77fc4b DG |
875 | goto close_sock; |
876 | } | |
877 | ||
6151a90f | 878 | *relayd_sock = rsock; |
2f77fc4b | 879 | |
f73fabfd | 880 | return LTTNG_OK; |
2f77fc4b DG |
881 | |
882 | close_sock: | |
6151a90f JD |
883 | /* The returned value is not useful since we are on an error path. */ |
884 | (void) relayd_close(rsock); | |
2f77fc4b | 885 | free_sock: |
6151a90f | 886 | free(rsock); |
2f77fc4b DG |
887 | error: |
888 | return ret; | |
889 | } | |
890 | ||
891 | /* | |
892 | * Connect to the relayd using URI and send the socket to the right consumer. | |
c8f690f8 JG |
893 | * |
894 | * The consumer socket lock must be held by the caller. | |
2f77fc4b | 895 | */ |
56a37563 JG |
896 | static int send_consumer_relayd_socket(enum lttng_domain_type domain, |
897 | unsigned int session_id, struct lttng_uri *relayd_uri, | |
898 | struct consumer_output *consumer, | |
d3e2ba59 JD |
899 | struct consumer_socket *consumer_sock, |
900 | char *session_name, char *hostname, int session_live_timer) | |
2f77fc4b DG |
901 | { |
902 | int ret; | |
6151a90f | 903 | struct lttcomm_relayd_sock *rsock = NULL; |
2f77fc4b | 904 | |
ffe60014 | 905 | /* Connect to relayd and make version check if uri is the control. */ |
b31610f2 | 906 | ret = create_connect_relayd(relayd_uri, &rsock, consumer); |
ffe60014 | 907 | if (ret != LTTNG_OK) { |
aecac544 | 908 | goto relayd_comm_error; |
ffe60014 | 909 | } |
6151a90f | 910 | assert(rsock); |
ffe60014 | 911 | |
2f77fc4b | 912 | /* Set the network sequence index if not set. */ |
d88aee68 DG |
913 | if (consumer->net_seq_index == (uint64_t) -1ULL) { |
914 | pthread_mutex_lock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
915 | /* |
916 | * Increment net_seq_idx because we are about to transfer the | |
917 | * new relayd socket to the consumer. | |
d88aee68 | 918 | * Assign unique key so the consumer can match streams. |
2f77fc4b | 919 | */ |
d88aee68 DG |
920 | consumer->net_seq_index = ++relayd_net_seq_idx; |
921 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
922 | } |
923 | ||
2f77fc4b | 924 | /* Send relayd socket to consumer. */ |
6151a90f | 925 | ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer, |
d3e2ba59 JD |
926 | relayd_uri->stype, session_id, |
927 | session_name, hostname, session_live_timer); | |
2f77fc4b | 928 | if (ret < 0) { |
f73fabfd | 929 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
930 | goto close_sock; |
931 | } | |
932 | ||
c890b720 DG |
933 | /* Flag that the corresponding socket was sent. */ |
934 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
ffe60014 | 935 | consumer_sock->control_sock_sent = 1; |
c890b720 | 936 | } else if (relayd_uri->stype == LTTNG_STREAM_DATA) { |
ffe60014 | 937 | consumer_sock->data_sock_sent = 1; |
c890b720 DG |
938 | } |
939 | ||
f73fabfd | 940 | ret = LTTNG_OK; |
2f77fc4b DG |
941 | |
942 | /* | |
943 | * Close socket which was dup on the consumer side. The session daemon does | |
944 | * NOT keep track of the relayd socket(s) once transfer to the consumer. | |
945 | */ | |
946 | ||
947 | close_sock: | |
ffe60014 DG |
948 | if (ret != LTTNG_OK) { |
949 | /* | |
d9078d0c DG |
950 | * The consumer output for this session should not be used anymore |
951 | * since the relayd connection failed thus making any tracing or/and | |
952 | * streaming not usable. | |
ffe60014 | 953 | */ |
d9078d0c | 954 | consumer->enabled = 0; |
ffe60014 | 955 | } |
aecac544 JR |
956 | (void) relayd_close(rsock); |
957 | free(rsock); | |
958 | ||
959 | relayd_comm_error: | |
2f77fc4b DG |
960 | return ret; |
961 | } | |
962 | ||
963 | /* | |
964 | * Send both relayd sockets to a specific consumer and domain. This is a | |
965 | * helper function to facilitate sending the information to the consumer for a | |
966 | * session. | |
c8f690f8 JG |
967 | * |
968 | * The consumer socket lock must be held by the caller. | |
2f77fc4b | 969 | */ |
56a37563 JG |
970 | static int send_consumer_relayd_sockets(enum lttng_domain_type domain, |
971 | unsigned int session_id, struct consumer_output *consumer, | |
972 | struct consumer_socket *sock, char *session_name, | |
973 | char *hostname, int session_live_timer) | |
2f77fc4b | 974 | { |
dda67f6c | 975 | int ret = LTTNG_OK; |
2f77fc4b | 976 | |
2f77fc4b | 977 | assert(consumer); |
6dc3064a | 978 | assert(sock); |
2f77fc4b | 979 | |
2f77fc4b | 980 | /* Sending control relayd socket. */ |
ffe60014 | 981 | if (!sock->control_sock_sent) { |
6dc3064a | 982 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
983 | &consumer->dst.net.control, consumer, sock, |
984 | session_name, hostname, session_live_timer); | |
c890b720 DG |
985 | if (ret != LTTNG_OK) { |
986 | goto error; | |
987 | } | |
2f77fc4b DG |
988 | } |
989 | ||
990 | /* Sending data relayd socket. */ | |
ffe60014 | 991 | if (!sock->data_sock_sent) { |
6dc3064a | 992 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
993 | &consumer->dst.net.data, consumer, sock, |
994 | session_name, hostname, session_live_timer); | |
c890b720 DG |
995 | if (ret != LTTNG_OK) { |
996 | goto error; | |
997 | } | |
2f77fc4b DG |
998 | } |
999 | ||
2f77fc4b DG |
1000 | error: |
1001 | return ret; | |
1002 | } | |
1003 | ||
1004 | /* | |
1005 | * Setup relayd connections for a tracing session. First creates the socket to | |
1006 | * the relayd and send them to the right domain consumer. Consumer type MUST be | |
1007 | * network. | |
1008 | */ | |
ffe60014 | 1009 | int cmd_setup_relayd(struct ltt_session *session) |
2f77fc4b | 1010 | { |
f73fabfd | 1011 | int ret = LTTNG_OK; |
2f77fc4b DG |
1012 | struct ltt_ust_session *usess; |
1013 | struct ltt_kernel_session *ksess; | |
1014 | struct consumer_socket *socket; | |
1015 | struct lttng_ht_iter iter; | |
1016 | ||
1017 | assert(session); | |
1018 | ||
1019 | usess = session->ust_session; | |
1020 | ksess = session->kernel_session; | |
1021 | ||
785d2d0d | 1022 | DBG("Setting relayd for session %s", session->name); |
2f77fc4b | 1023 | |
e7fe706f DG |
1024 | rcu_read_lock(); |
1025 | ||
2f77fc4b DG |
1026 | if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET |
1027 | && usess->consumer->enabled) { | |
1028 | /* For each consumer socket, send relayd sockets */ | |
1029 | cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, | |
1030 | socket, node.node) { | |
2f77fc4b | 1031 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1032 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id, |
d3e2ba59 JD |
1033 | usess->consumer, socket, |
1034 | session->name, session->hostname, | |
1035 | session->live_timer); | |
2f77fc4b | 1036 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1037 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1038 | goto error; |
1039 | } | |
6dc3064a DG |
1040 | /* Session is now ready for network streaming. */ |
1041 | session->net_handle = 1; | |
2f77fc4b | 1042 | } |
b31610f2 JD |
1043 | session->consumer->relay_major_version = |
1044 | usess->consumer->relay_major_version; | |
1045 | session->consumer->relay_minor_version = | |
1046 | usess->consumer->relay_minor_version; | |
2f77fc4b DG |
1047 | } |
1048 | ||
1049 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET | |
1050 | && ksess->consumer->enabled) { | |
1051 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1052 | socket, node.node) { | |
2f77fc4b | 1053 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1054 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id, |
d3e2ba59 JD |
1055 | ksess->consumer, socket, |
1056 | session->name, session->hostname, | |
1057 | session->live_timer); | |
2f77fc4b | 1058 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1059 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1060 | goto error; |
1061 | } | |
6dc3064a DG |
1062 | /* Session is now ready for network streaming. */ |
1063 | session->net_handle = 1; | |
2f77fc4b | 1064 | } |
b31610f2 JD |
1065 | session->consumer->relay_major_version = |
1066 | ksess->consumer->relay_major_version; | |
1067 | session->consumer->relay_minor_version = | |
1068 | ksess->consumer->relay_minor_version; | |
2f77fc4b DG |
1069 | } |
1070 | ||
1071 | error: | |
e7fe706f | 1072 | rcu_read_unlock(); |
2f77fc4b DG |
1073 | return ret; |
1074 | } | |
1075 | ||
9b6c7ec5 DG |
1076 | /* |
1077 | * Start a kernel session by opening all necessary streams. | |
1078 | */ | |
1079 | static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe) | |
1080 | { | |
1081 | int ret; | |
1082 | struct ltt_kernel_channel *kchan; | |
1083 | ||
1084 | /* Open kernel metadata */ | |
07b86b52 | 1085 | if (ksess->metadata == NULL && ksess->output_traces) { |
9b6c7ec5 DG |
1086 | ret = kernel_open_metadata(ksess); |
1087 | if (ret < 0) { | |
1088 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1089 | goto error; | |
1090 | } | |
1091 | } | |
1092 | ||
1093 | /* Open kernel metadata stream */ | |
07b86b52 | 1094 | if (ksess->metadata && ksess->metadata_stream_fd < 0) { |
9b6c7ec5 DG |
1095 | ret = kernel_open_metadata_stream(ksess); |
1096 | if (ret < 0) { | |
1097 | ERR("Kernel create metadata stream failed"); | |
1098 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1099 | goto error; | |
1100 | } | |
1101 | } | |
1102 | ||
1103 | /* For each channel */ | |
1104 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
1105 | if (kchan->stream_count == 0) { | |
1106 | ret = kernel_open_channel_stream(kchan); | |
1107 | if (ret < 0) { | |
1108 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1109 | goto error; | |
1110 | } | |
1111 | /* Update the stream global counter */ | |
1112 | ksess->stream_count_global += ret; | |
1113 | } | |
1114 | } | |
1115 | ||
1116 | /* Setup kernel consumer socket and send fds to it */ | |
1117 | ret = init_kernel_tracing(ksess); | |
e43c41c5 | 1118 | if (ret != 0) { |
9b6c7ec5 DG |
1119 | ret = LTTNG_ERR_KERN_START_FAIL; |
1120 | goto error; | |
1121 | } | |
1122 | ||
1123 | /* This start the kernel tracing */ | |
1124 | ret = kernel_start_session(ksess); | |
1125 | if (ret < 0) { | |
1126 | ret = LTTNG_ERR_KERN_START_FAIL; | |
1127 | goto error; | |
1128 | } | |
1129 | ||
1130 | /* Quiescent wait after starting trace */ | |
784303b0 | 1131 | kernel_wait_quiescent(kernel_tracer_fd); |
9b6c7ec5 | 1132 | |
14fb1ebe | 1133 | ksess->active = 1; |
9b6c7ec5 DG |
1134 | |
1135 | ret = LTTNG_OK; | |
1136 | ||
1137 | error: | |
1138 | return ret; | |
1139 | } | |
1140 | ||
2f77fc4b DG |
1141 | /* |
1142 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. | |
1143 | */ | |
56a37563 JG |
1144 | int cmd_disable_channel(struct ltt_session *session, |
1145 | enum lttng_domain_type domain, char *channel_name) | |
2f77fc4b DG |
1146 | { |
1147 | int ret; | |
1148 | struct ltt_ust_session *usess; | |
1149 | ||
1150 | usess = session->ust_session; | |
1151 | ||
2223c96f DG |
1152 | rcu_read_lock(); |
1153 | ||
2f77fc4b DG |
1154 | switch (domain) { |
1155 | case LTTNG_DOMAIN_KERNEL: | |
1156 | { | |
1157 | ret = channel_kernel_disable(session->kernel_session, | |
1158 | channel_name); | |
f73fabfd | 1159 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1160 | goto error; |
1161 | } | |
1162 | ||
1163 | kernel_wait_quiescent(kernel_tracer_fd); | |
1164 | break; | |
1165 | } | |
1166 | case LTTNG_DOMAIN_UST: | |
1167 | { | |
1168 | struct ltt_ust_channel *uchan; | |
1169 | struct lttng_ht *chan_ht; | |
1170 | ||
1171 | chan_ht = usess->domain_global.channels; | |
1172 | ||
1173 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
1174 | if (uchan == NULL) { | |
f73fabfd | 1175 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
1176 | goto error; |
1177 | } | |
1178 | ||
7972aab2 | 1179 | ret = channel_ust_disable(usess, uchan); |
f73fabfd | 1180 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1181 | goto error; |
1182 | } | |
1183 | break; | |
1184 | } | |
2f77fc4b | 1185 | default: |
f73fabfd | 1186 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1187 | goto error; |
1188 | } | |
1189 | ||
f73fabfd | 1190 | ret = LTTNG_OK; |
2f77fc4b DG |
1191 | |
1192 | error: | |
2223c96f | 1193 | rcu_read_unlock(); |
2f77fc4b DG |
1194 | return ret; |
1195 | } | |
1196 | ||
ccf10263 MD |
1197 | /* |
1198 | * Command LTTNG_TRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1199 | * |
1200 | * Called with session lock held. | |
ccf10263 | 1201 | */ |
56a37563 JG |
1202 | int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1203 | int pid) | |
ccf10263 MD |
1204 | { |
1205 | int ret; | |
1206 | ||
1207 | rcu_read_lock(); | |
1208 | ||
1209 | switch (domain) { | |
1210 | case LTTNG_DOMAIN_KERNEL: | |
1211 | { | |
1212 | struct ltt_kernel_session *ksess; | |
1213 | ||
1214 | ksess = session->kernel_session; | |
1215 | ||
1216 | ret = kernel_track_pid(ksess, pid); | |
1217 | if (ret != LTTNG_OK) { | |
1218 | goto error; | |
1219 | } | |
1220 | ||
1221 | kernel_wait_quiescent(kernel_tracer_fd); | |
1222 | break; | |
1223 | } | |
ccf10263 | 1224 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1225 | { |
1226 | struct ltt_ust_session *usess; | |
1227 | ||
1228 | usess = session->ust_session; | |
1229 | ||
1230 | ret = trace_ust_track_pid(usess, pid); | |
1231 | if (ret != LTTNG_OK) { | |
1232 | goto error; | |
1233 | } | |
1234 | break; | |
1235 | } | |
ccf10263 MD |
1236 | default: |
1237 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1238 | goto error; | |
1239 | } | |
1240 | ||
1241 | ret = LTTNG_OK; | |
1242 | ||
1243 | error: | |
1244 | rcu_read_unlock(); | |
1245 | return ret; | |
1246 | } | |
1247 | ||
1248 | /* | |
1249 | * Command LTTNG_UNTRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1250 | * |
1251 | * Called with session lock held. | |
ccf10263 | 1252 | */ |
56a37563 JG |
1253 | int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1254 | int pid) | |
ccf10263 MD |
1255 | { |
1256 | int ret; | |
1257 | ||
1258 | rcu_read_lock(); | |
1259 | ||
1260 | switch (domain) { | |
1261 | case LTTNG_DOMAIN_KERNEL: | |
1262 | { | |
1263 | struct ltt_kernel_session *ksess; | |
1264 | ||
1265 | ksess = session->kernel_session; | |
1266 | ||
1267 | ret = kernel_untrack_pid(ksess, pid); | |
1268 | if (ret != LTTNG_OK) { | |
1269 | goto error; | |
1270 | } | |
1271 | ||
1272 | kernel_wait_quiescent(kernel_tracer_fd); | |
1273 | break; | |
1274 | } | |
ccf10263 | 1275 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1276 | { |
1277 | struct ltt_ust_session *usess; | |
1278 | ||
1279 | usess = session->ust_session; | |
1280 | ||
1281 | ret = trace_ust_untrack_pid(usess, pid); | |
1282 | if (ret != LTTNG_OK) { | |
1283 | goto error; | |
1284 | } | |
1285 | break; | |
1286 | } | |
ccf10263 MD |
1287 | default: |
1288 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1289 | goto error; | |
1290 | } | |
1291 | ||
1292 | ret = LTTNG_OK; | |
1293 | ||
1294 | error: | |
1295 | rcu_read_unlock(); | |
1296 | return ret; | |
1297 | } | |
1298 | ||
2f77fc4b DG |
1299 | /* |
1300 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
1301 | * | |
1302 | * The wpipe arguments is used as a notifier for the kernel thread. | |
1303 | */ | |
1304 | int cmd_enable_channel(struct ltt_session *session, | |
7972aab2 | 1305 | struct lttng_domain *domain, struct lttng_channel *attr, int wpipe) |
2f77fc4b DG |
1306 | { |
1307 | int ret; | |
1308 | struct ltt_ust_session *usess = session->ust_session; | |
1309 | struct lttng_ht *chan_ht; | |
1f345e94 | 1310 | size_t len; |
2f77fc4b DG |
1311 | |
1312 | assert(session); | |
1313 | assert(attr); | |
7972aab2 | 1314 | assert(domain); |
2f77fc4b | 1315 | |
f5436bfc | 1316 | len = lttng_strnlen(attr->name, sizeof(attr->name)); |
1f345e94 PP |
1317 | |
1318 | /* Validate channel name */ | |
1319 | if (attr->name[0] == '.' || | |
1320 | memchr(attr->name, '/', len) != NULL) { | |
1321 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1322 | goto end; | |
1323 | } | |
1324 | ||
2f77fc4b DG |
1325 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
1326 | ||
03b4fdcf DG |
1327 | rcu_read_lock(); |
1328 | ||
ecc48a90 JD |
1329 | /* |
1330 | * Don't try to enable a channel if the session has been started at | |
1331 | * some point in time before. The tracer does not allow it. | |
1332 | */ | |
8382cf6f | 1333 | if (session->has_been_started) { |
ecc48a90 JD |
1334 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
1335 | goto error; | |
1336 | } | |
1337 | ||
1338 | /* | |
1339 | * If the session is a live session, remove the switch timer, the | |
1340 | * live timer does the same thing but sends also synchronisation | |
1341 | * beacons for inactive streams. | |
1342 | */ | |
1343 | if (session->live_timer > 0) { | |
1344 | attr->attr.live_timer_interval = session->live_timer; | |
1345 | attr->attr.switch_timer_interval = 0; | |
1346 | } | |
1347 | ||
09a88287 JG |
1348 | /* Check for feature support */ |
1349 | switch (domain->type) { | |
1350 | case LTTNG_DOMAIN_JUL: | |
1351 | case LTTNG_DOMAIN_LOG4J: | |
1352 | case LTTNG_DOMAIN_PYTHON: | |
1353 | if (!agent_tracing_is_enabled()) { | |
1354 | DBG("Attempted to enable a channel in an agent domain but the agent thread is not running"); | |
1355 | ret = LTTNG_ERR_AGENT_TRACING_DISABLED; | |
1356 | goto error; | |
1357 | } | |
1358 | break; | |
1359 | default: | |
1360 | break; | |
1361 | } | |
1362 | ||
7972aab2 | 1363 | switch (domain->type) { |
2f77fc4b DG |
1364 | case LTTNG_DOMAIN_KERNEL: |
1365 | { | |
1366 | struct ltt_kernel_channel *kchan; | |
1367 | ||
2f77fc4b DG |
1368 | kchan = trace_kernel_get_channel_by_name(attr->name, |
1369 | session->kernel_session); | |
1370 | if (kchan == NULL) { | |
1371 | ret = channel_kernel_create(session->kernel_session, attr, wpipe); | |
85076754 MD |
1372 | if (attr->name[0] != '\0') { |
1373 | session->kernel_session->has_non_default_channel = 1; | |
1374 | } | |
2f77fc4b DG |
1375 | } else { |
1376 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
1377 | } | |
1378 | ||
f73fabfd | 1379 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1380 | goto error; |
1381 | } | |
1382 | ||
784303b0 | 1383 | kernel_wait_quiescent(kernel_tracer_fd); |
2f77fc4b DG |
1384 | break; |
1385 | } | |
1386 | case LTTNG_DOMAIN_UST: | |
9232818f JG |
1387 | case LTTNG_DOMAIN_JUL: |
1388 | case LTTNG_DOMAIN_LOG4J: | |
1389 | case LTTNG_DOMAIN_PYTHON: | |
2f77fc4b DG |
1390 | { |
1391 | struct ltt_ust_channel *uchan; | |
1392 | ||
9232818f JG |
1393 | /* |
1394 | * FIXME | |
1395 | * | |
1396 | * Current agent implementation limitations force us to allow | |
1397 | * only one channel at once in "agent" subdomains. Each | |
1398 | * subdomain has a default channel name which must be strictly | |
1399 | * adhered to. | |
1400 | */ | |
1401 | if (domain->type == LTTNG_DOMAIN_JUL) { | |
1402 | if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME, | |
1403 | LTTNG_SYMBOL_NAME_LEN)) { | |
1404 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1405 | goto error; | |
1406 | } | |
1407 | } else if (domain->type == LTTNG_DOMAIN_LOG4J) { | |
1408 | if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME, | |
1409 | LTTNG_SYMBOL_NAME_LEN)) { | |
1410 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1411 | goto error; | |
1412 | } | |
1413 | } else if (domain->type == LTTNG_DOMAIN_PYTHON) { | |
1414 | if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME, | |
1415 | LTTNG_SYMBOL_NAME_LEN)) { | |
1416 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1417 | goto error; | |
1418 | } | |
1419 | } | |
1420 | ||
2f77fc4b DG |
1421 | chan_ht = usess->domain_global.channels; |
1422 | ||
1423 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); | |
1424 | if (uchan == NULL) { | |
7972aab2 | 1425 | ret = channel_ust_create(usess, attr, domain->buf_type); |
85076754 MD |
1426 | if (attr->name[0] != '\0') { |
1427 | usess->has_non_default_channel = 1; | |
1428 | } | |
2f77fc4b | 1429 | } else { |
7972aab2 | 1430 | ret = channel_ust_enable(usess, uchan); |
2f77fc4b DG |
1431 | } |
1432 | break; | |
1433 | } | |
2f77fc4b | 1434 | default: |
f73fabfd | 1435 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1436 | goto error; |
1437 | } | |
1438 | ||
1439 | error: | |
2223c96f | 1440 | rcu_read_unlock(); |
1f345e94 | 1441 | end: |
2f77fc4b DG |
1442 | return ret; |
1443 | } | |
1444 | ||
2f77fc4b DG |
1445 | /* |
1446 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1447 | */ | |
56a37563 JG |
1448 | int cmd_disable_event(struct ltt_session *session, |
1449 | enum lttng_domain_type domain, char *channel_name, | |
6e911cad | 1450 | struct lttng_event *event) |
2f77fc4b DG |
1451 | { |
1452 | int ret; | |
6e911cad MD |
1453 | char *event_name; |
1454 | ||
18a720cd MD |
1455 | DBG("Disable event command for event \'%s\'", event->name); |
1456 | ||
6e911cad | 1457 | event_name = event->name; |
7076b56e JG |
1458 | if (validate_event_name(event_name)) { |
1459 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1460 | goto error; | |
1461 | } | |
6e911cad | 1462 | |
9b7431cf JG |
1463 | /* Error out on unhandled search criteria */ |
1464 | if (event->loglevel_type || event->loglevel != -1 || event->enabled | |
6e911cad | 1465 | || event->pid || event->filter || event->exclusion) { |
7076b56e JG |
1466 | ret = LTTNG_ERR_UNK; |
1467 | goto error; | |
6e911cad | 1468 | } |
2f77fc4b | 1469 | |
2223c96f DG |
1470 | rcu_read_lock(); |
1471 | ||
2f77fc4b DG |
1472 | switch (domain) { |
1473 | case LTTNG_DOMAIN_KERNEL: | |
1474 | { | |
1475 | struct ltt_kernel_channel *kchan; | |
1476 | struct ltt_kernel_session *ksess; | |
1477 | ||
1478 | ksess = session->kernel_session; | |
1479 | ||
85076754 MD |
1480 | /* |
1481 | * If a non-default channel has been created in the | |
1482 | * session, explicitely require that -c chan_name needs | |
1483 | * to be provided. | |
1484 | */ | |
1485 | if (ksess->has_non_default_channel && channel_name[0] == '\0') { | |
1486 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1487 | goto error_unlock; |
85076754 MD |
1488 | } |
1489 | ||
2f77fc4b DG |
1490 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
1491 | if (kchan == NULL) { | |
f73fabfd | 1492 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
7076b56e | 1493 | goto error_unlock; |
2f77fc4b DG |
1494 | } |
1495 | ||
6e911cad MD |
1496 | switch (event->type) { |
1497 | case LTTNG_EVENT_ALL: | |
9550ee81 | 1498 | case LTTNG_EVENT_TRACEPOINT: |
d0ae4ea8 | 1499 | case LTTNG_EVENT_SYSCALL: |
9550ee81 JR |
1500 | case LTTNG_EVENT_PROBE: |
1501 | case LTTNG_EVENT_FUNCTION: | |
1502 | case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */ | |
1503 | if (event_name[0] == '\0') { | |
1504 | ret = event_kernel_disable_event(kchan, | |
1505 | NULL, event->type); | |
29c62722 | 1506 | } else { |
d0ae4ea8 | 1507 | ret = event_kernel_disable_event(kchan, |
9550ee81 | 1508 | event_name, event->type); |
29c62722 | 1509 | } |
6e911cad | 1510 | if (ret != LTTNG_OK) { |
7076b56e | 1511 | goto error_unlock; |
6e911cad MD |
1512 | } |
1513 | break; | |
6e911cad MD |
1514 | default: |
1515 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1516 | goto error_unlock; |
2f77fc4b DG |
1517 | } |
1518 | ||
1519 | kernel_wait_quiescent(kernel_tracer_fd); | |
1520 | break; | |
1521 | } | |
1522 | case LTTNG_DOMAIN_UST: | |
1523 | { | |
1524 | struct ltt_ust_channel *uchan; | |
1525 | struct ltt_ust_session *usess; | |
1526 | ||
1527 | usess = session->ust_session; | |
1528 | ||
7076b56e JG |
1529 | if (validate_ust_event_name(event_name)) { |
1530 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1531 | goto error_unlock; | |
1532 | } | |
1533 | ||
85076754 MD |
1534 | /* |
1535 | * If a non-default channel has been created in the | |
9550ee81 | 1536 | * session, explicitly require that -c chan_name needs |
85076754 MD |
1537 | * to be provided. |
1538 | */ | |
1539 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1540 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1541 | goto error_unlock; |
85076754 MD |
1542 | } |
1543 | ||
2f77fc4b DG |
1544 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
1545 | channel_name); | |
1546 | if (uchan == NULL) { | |
f73fabfd | 1547 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
7076b56e | 1548 | goto error_unlock; |
2f77fc4b DG |
1549 | } |
1550 | ||
6e911cad MD |
1551 | switch (event->type) { |
1552 | case LTTNG_EVENT_ALL: | |
b3639870 JR |
1553 | /* |
1554 | * An empty event name means that everything | |
1555 | * should be disabled. | |
1556 | */ | |
1557 | if (event->name[0] == '\0') { | |
1558 | ret = event_ust_disable_all_tracepoints(usess, uchan); | |
77d536b2 JR |
1559 | } else { |
1560 | ret = event_ust_disable_tracepoint(usess, uchan, | |
1561 | event_name); | |
1562 | } | |
6e911cad | 1563 | if (ret != LTTNG_OK) { |
7076b56e | 1564 | goto error_unlock; |
6e911cad MD |
1565 | } |
1566 | break; | |
1567 | default: | |
1568 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1569 | goto error_unlock; |
2f77fc4b DG |
1570 | } |
1571 | ||
1572 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
1573 | channel_name); | |
1574 | break; | |
1575 | } | |
5cdb6027 | 1576 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1577 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1578 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1579 | { |
fefd409b | 1580 | struct agent *agt; |
f20baf8e DG |
1581 | struct ltt_ust_session *usess = session->ust_session; |
1582 | ||
1583 | assert(usess); | |
1584 | ||
6e911cad MD |
1585 | switch (event->type) { |
1586 | case LTTNG_EVENT_ALL: | |
1587 | break; | |
1588 | default: | |
1589 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1590 | goto error_unlock; |
6e911cad MD |
1591 | } |
1592 | ||
5cdb6027 | 1593 | agt = trace_ust_find_agent(usess, domain); |
fefd409b DG |
1594 | if (!agt) { |
1595 | ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
7076b56e | 1596 | goto error_unlock; |
fefd409b | 1597 | } |
b3639870 JR |
1598 | /* |
1599 | * An empty event name means that everything | |
1600 | * should be disabled. | |
1601 | */ | |
1602 | if (event->name[0] == '\0') { | |
18a720cd MD |
1603 | ret = event_agent_disable_all(usess, agt); |
1604 | } else { | |
1605 | ret = event_agent_disable(usess, agt, event_name); | |
1606 | } | |
f20baf8e | 1607 | if (ret != LTTNG_OK) { |
7076b56e | 1608 | goto error_unlock; |
f20baf8e DG |
1609 | } |
1610 | ||
1611 | break; | |
1612 | } | |
2f77fc4b | 1613 | default: |
f73fabfd | 1614 | ret = LTTNG_ERR_UND; |
7076b56e | 1615 | goto error_unlock; |
2f77fc4b DG |
1616 | } |
1617 | ||
f73fabfd | 1618 | ret = LTTNG_OK; |
2f77fc4b | 1619 | |
7076b56e | 1620 | error_unlock: |
2223c96f | 1621 | rcu_read_unlock(); |
7076b56e | 1622 | error: |
2f77fc4b DG |
1623 | return ret; |
1624 | } | |
1625 | ||
2f77fc4b DG |
1626 | /* |
1627 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1628 | */ | |
56a37563 | 1629 | int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain, |
601d5acf | 1630 | char *channel_name, struct lttng_event_context *ctx, int kwpipe) |
2f77fc4b | 1631 | { |
d5979e4a | 1632 | int ret, chan_kern_created = 0, chan_ust_created = 0; |
bdf64013 JG |
1633 | char *app_ctx_provider_name = NULL, *app_ctx_name = NULL; |
1634 | ||
3dd2c2c6 JR |
1635 | /* |
1636 | * Don't try to add a context if the session has been started at | |
1637 | * some point in time before. The tracer does not allow it and would | |
1638 | * result in a corrupted trace. | |
1639 | */ | |
1640 | if (session->has_been_started) { | |
1641 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; | |
1642 | goto end; | |
1643 | } | |
1644 | ||
bdf64013 JG |
1645 | if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) { |
1646 | app_ctx_provider_name = ctx->u.app_ctx.provider_name; | |
1647 | app_ctx_name = ctx->u.app_ctx.ctx_name; | |
1648 | } | |
2f77fc4b DG |
1649 | |
1650 | switch (domain) { | |
1651 | case LTTNG_DOMAIN_KERNEL: | |
979e618e DG |
1652 | assert(session->kernel_session); |
1653 | ||
1654 | if (session->kernel_session->channel_count == 0) { | |
1655 | /* Create default channel */ | |
1656 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); | |
1657 | if (ret != LTTNG_OK) { | |
1658 | goto error; | |
1659 | } | |
d5979e4a | 1660 | chan_kern_created = 1; |
979e618e | 1661 | } |
2f77fc4b | 1662 | /* Add kernel context to kernel tracer */ |
601d5acf | 1663 | ret = context_kernel_add(session->kernel_session, ctx, channel_name); |
f73fabfd | 1664 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1665 | goto error; |
1666 | } | |
1667 | break; | |
bdf64013 JG |
1668 | case LTTNG_DOMAIN_JUL: |
1669 | case LTTNG_DOMAIN_LOG4J: | |
1670 | { | |
1671 | /* | |
1672 | * Validate channel name. | |
1673 | * If no channel name is given and the domain is JUL or LOG4J, | |
1674 | * set it to the appropriate domain-specific channel name. If | |
1675 | * a name is provided but does not match the expexted channel | |
1676 | * name, return an error. | |
1677 | */ | |
1678 | if (domain == LTTNG_DOMAIN_JUL && *channel_name && | |
1679 | strcmp(channel_name, | |
1680 | DEFAULT_JUL_CHANNEL_NAME)) { | |
1681 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1682 | goto error; | |
1683 | } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name && | |
1684 | strcmp(channel_name, | |
1685 | DEFAULT_LOG4J_CHANNEL_NAME)) { | |
1686 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1687 | goto error; | |
1688 | } | |
a93b3916 | 1689 | /* break is _not_ missing here. */ |
bdf64013 | 1690 | } |
2f77fc4b DG |
1691 | case LTTNG_DOMAIN_UST: |
1692 | { | |
1693 | struct ltt_ust_session *usess = session->ust_session; | |
85076754 MD |
1694 | unsigned int chan_count; |
1695 | ||
2f77fc4b DG |
1696 | assert(usess); |
1697 | ||
85076754 | 1698 | chan_count = lttng_ht_get_count(usess->domain_global.channels); |
979e618e DG |
1699 | if (chan_count == 0) { |
1700 | struct lttng_channel *attr; | |
1701 | /* Create default channel */ | |
0a9c6494 | 1702 | attr = channel_new_default_attr(domain, usess->buffer_type); |
979e618e DG |
1703 | if (attr == NULL) { |
1704 | ret = LTTNG_ERR_FATAL; | |
1705 | goto error; | |
1706 | } | |
1707 | ||
7972aab2 | 1708 | ret = channel_ust_create(usess, attr, usess->buffer_type); |
979e618e DG |
1709 | if (ret != LTTNG_OK) { |
1710 | free(attr); | |
1711 | goto error; | |
1712 | } | |
1713 | free(attr); | |
d5979e4a | 1714 | chan_ust_created = 1; |
979e618e DG |
1715 | } |
1716 | ||
601d5acf | 1717 | ret = context_ust_add(usess, domain, ctx, channel_name); |
bdf64013 JG |
1718 | free(app_ctx_provider_name); |
1719 | free(app_ctx_name); | |
1720 | app_ctx_name = NULL; | |
1721 | app_ctx_provider_name = NULL; | |
f73fabfd | 1722 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1723 | goto error; |
1724 | } | |
1725 | break; | |
1726 | } | |
2f77fc4b | 1727 | default: |
f73fabfd | 1728 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1729 | goto error; |
1730 | } | |
1731 | ||
bdf64013 JG |
1732 | ret = LTTNG_OK; |
1733 | goto end; | |
2f77fc4b DG |
1734 | |
1735 | error: | |
d5979e4a DG |
1736 | if (chan_kern_created) { |
1737 | struct ltt_kernel_channel *kchan = | |
1738 | trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME, | |
1739 | session->kernel_session); | |
1740 | /* Created previously, this should NOT fail. */ | |
1741 | assert(kchan); | |
1742 | kernel_destroy_channel(kchan); | |
1743 | } | |
1744 | ||
1745 | if (chan_ust_created) { | |
1746 | struct ltt_ust_channel *uchan = | |
1747 | trace_ust_find_channel_by_name( | |
1748 | session->ust_session->domain_global.channels, | |
1749 | DEFAULT_CHANNEL_NAME); | |
1750 | /* Created previously, this should NOT fail. */ | |
1751 | assert(uchan); | |
1752 | /* Remove from the channel list of the session. */ | |
1753 | trace_ust_delete_channel(session->ust_session->domain_global.channels, | |
1754 | uchan); | |
1755 | trace_ust_destroy_channel(uchan); | |
1756 | } | |
bdf64013 JG |
1757 | end: |
1758 | free(app_ctx_provider_name); | |
1759 | free(app_ctx_name); | |
2f77fc4b DG |
1760 | return ret; |
1761 | } | |
1762 | ||
930a2e99 JG |
1763 | static int validate_event_name(const char *name) |
1764 | { | |
1765 | int ret = 0; | |
1766 | const char *c = name; | |
1767 | const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN; | |
bf9807db | 1768 | bool null_terminated = false; |
930a2e99 JG |
1769 | |
1770 | /* | |
1771 | * Make sure that unescaped wildcards are only used as the last | |
1772 | * character of the event name. | |
1773 | */ | |
1774 | while (c < event_name_end) { | |
1775 | switch (*c) { | |
1776 | case '\0': | |
bf9807db | 1777 | null_terminated = true; |
930a2e99 JG |
1778 | goto end; |
1779 | case '\\': | |
1780 | c++; | |
1781 | break; | |
1782 | case '*': | |
1783 | if ((c + 1) < event_name_end && *(c + 1)) { | |
1784 | /* Wildcard is not the last character */ | |
1785 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1786 | goto end; | |
1787 | } | |
1788 | default: | |
1789 | break; | |
1790 | } | |
1791 | c++; | |
1792 | } | |
1793 | end: | |
bf9807db JG |
1794 | if (!ret && !null_terminated) { |
1795 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1796 | } | |
930a2e99 JG |
1797 | return ret; |
1798 | } | |
1799 | ||
dac8e046 JG |
1800 | static inline bool name_starts_with(const char *name, const char *prefix) |
1801 | { | |
1802 | const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN); | |
1803 | ||
1804 | return !strncmp(name, prefix, max_cmp_len); | |
1805 | } | |
1806 | ||
1807 | /* Perform userspace-specific event name validation */ | |
1808 | static int validate_ust_event_name(const char *name) | |
1809 | { | |
1810 | int ret = 0; | |
1811 | ||
1812 | if (!name) { | |
1813 | ret = -1; | |
1814 | goto end; | |
1815 | } | |
1816 | ||
1817 | /* | |
1818 | * Check name against all internal UST event component namespaces used | |
1819 | * by the agents. | |
1820 | */ | |
1821 | if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) || | |
1822 | name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) || | |
1823 | name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) { | |
1824 | ret = -1; | |
1825 | } | |
1826 | ||
1827 | end: | |
1828 | return ret; | |
1829 | } | |
88f06f15 | 1830 | |
2f77fc4b | 1831 | /* |
88f06f15 JG |
1832 | * Internal version of cmd_enable_event() with a supplemental |
1833 | * "internal_event" flag which is used to enable internal events which should | |
1834 | * be hidden from clients. Such events are used in the agent implementation to | |
1835 | * enable the events through which all "agent" events are funeled. | |
2f77fc4b | 1836 | */ |
88f06f15 JG |
1837 | static int _cmd_enable_event(struct ltt_session *session, |
1838 | struct lttng_domain *domain, | |
025faf73 | 1839 | char *channel_name, struct lttng_event *event, |
6b453b5e | 1840 | char *filter_expression, |
db8f1377 JI |
1841 | struct lttng_filter_bytecode *filter, |
1842 | struct lttng_event_exclusion *exclusion, | |
88f06f15 | 1843 | int wpipe, bool internal_event) |
2f77fc4b | 1844 | { |
e5f5db7f | 1845 | int ret, channel_created = 0; |
cfedea03 | 1846 | struct lttng_channel *attr = NULL; |
2f77fc4b DG |
1847 | |
1848 | assert(session); | |
1849 | assert(event); | |
1850 | assert(channel_name); | |
1851 | ||
2a385866 JG |
1852 | /* If we have a filter, we must have its filter expression */ |
1853 | assert(!(!!filter_expression ^ !!filter)); | |
1854 | ||
18a720cd MD |
1855 | DBG("Enable event command for event \'%s\'", event->name); |
1856 | ||
f5ac4bd7 MD |
1857 | rcu_read_lock(); |
1858 | ||
930a2e99 JG |
1859 | ret = validate_event_name(event->name); |
1860 | if (ret) { | |
1861 | goto error; | |
1862 | } | |
1863 | ||
7972aab2 | 1864 | switch (domain->type) { |
2f77fc4b DG |
1865 | case LTTNG_DOMAIN_KERNEL: |
1866 | { | |
1867 | struct ltt_kernel_channel *kchan; | |
1868 | ||
85076754 MD |
1869 | /* |
1870 | * If a non-default channel has been created in the | |
1871 | * session, explicitely require that -c chan_name needs | |
1872 | * to be provided. | |
1873 | */ | |
1874 | if (session->kernel_session->has_non_default_channel | |
1875 | && channel_name[0] == '\0') { | |
1876 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1877 | goto error; | |
1878 | } | |
1879 | ||
2f77fc4b DG |
1880 | kchan = trace_kernel_get_channel_by_name(channel_name, |
1881 | session->kernel_session); | |
1882 | if (kchan == NULL) { | |
0a9c6494 DG |
1883 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
1884 | LTTNG_BUFFER_GLOBAL); | |
2f77fc4b | 1885 | if (attr == NULL) { |
f73fabfd | 1886 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1887 | goto error; |
1888 | } | |
04c17253 MD |
1889 | if (lttng_strncpy(attr->name, channel_name, |
1890 | sizeof(attr->name))) { | |
1891 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
1892 | goto error; |
1893 | } | |
2f77fc4b DG |
1894 | |
1895 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1896 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1897 | goto error; |
1898 | } | |
e5f5db7f | 1899 | channel_created = 1; |
2f77fc4b DG |
1900 | } |
1901 | ||
1902 | /* Get the newly created kernel channel pointer */ | |
1903 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1904 | session->kernel_session); | |
1905 | if (kchan == NULL) { | |
1906 | /* This sould not happen... */ | |
f73fabfd | 1907 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1908 | goto error; |
1909 | } | |
1910 | ||
6e911cad MD |
1911 | switch (event->type) { |
1912 | case LTTNG_EVENT_ALL: | |
29c62722 | 1913 | { |
00a62084 MD |
1914 | char *filter_expression_a = NULL; |
1915 | struct lttng_filter_bytecode *filter_a = NULL; | |
1916 | ||
1917 | /* | |
1918 | * We need to duplicate filter_expression and filter, | |
1919 | * because ownership is passed to first enable | |
1920 | * event. | |
1921 | */ | |
1922 | if (filter_expression) { | |
1923 | filter_expression_a = strdup(filter_expression); | |
1924 | if (!filter_expression_a) { | |
1925 | ret = LTTNG_ERR_FATAL; | |
1926 | goto error; | |
1927 | } | |
1928 | } | |
1929 | if (filter) { | |
1930 | filter_a = zmalloc(sizeof(*filter_a) + filter->len); | |
1931 | if (!filter_a) { | |
1932 | free(filter_expression_a); | |
1933 | ret = LTTNG_ERR_FATAL; | |
1934 | goto error; | |
1935 | } | |
1936 | memcpy(filter_a, filter, sizeof(*filter_a) + filter->len); | |
1937 | } | |
29c62722 | 1938 | event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */ |
00a62084 MD |
1939 | ret = event_kernel_enable_event(kchan, event, |
1940 | filter_expression, filter); | |
a969e101 MD |
1941 | /* We have passed ownership */ |
1942 | filter_expression = NULL; | |
1943 | filter = NULL; | |
29c62722 MD |
1944 | if (ret != LTTNG_OK) { |
1945 | if (channel_created) { | |
1946 | /* Let's not leak a useless channel. */ | |
1947 | kernel_destroy_channel(kchan); | |
1948 | } | |
00a62084 MD |
1949 | free(filter_expression_a); |
1950 | free(filter_a); | |
29c62722 MD |
1951 | goto error; |
1952 | } | |
1953 | event->type = LTTNG_EVENT_SYSCALL; /* Hack */ | |
00a62084 MD |
1954 | ret = event_kernel_enable_event(kchan, event, |
1955 | filter_expression_a, filter_a); | |
60d21fa2 AB |
1956 | /* We have passed ownership */ |
1957 | filter_expression_a = NULL; | |
1958 | filter_a = NULL; | |
29c62722 MD |
1959 | if (ret != LTTNG_OK) { |
1960 | goto error; | |
1961 | } | |
1962 | break; | |
1963 | } | |
6e6ef3d7 DG |
1964 | case LTTNG_EVENT_PROBE: |
1965 | case LTTNG_EVENT_FUNCTION: | |
1966 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
6e911cad | 1967 | case LTTNG_EVENT_TRACEPOINT: |
00a62084 MD |
1968 | ret = event_kernel_enable_event(kchan, event, |
1969 | filter_expression, filter); | |
a969e101 MD |
1970 | /* We have passed ownership */ |
1971 | filter_expression = NULL; | |
1972 | filter = NULL; | |
6e911cad MD |
1973 | if (ret != LTTNG_OK) { |
1974 | if (channel_created) { | |
1975 | /* Let's not leak a useless channel. */ | |
1976 | kernel_destroy_channel(kchan); | |
1977 | } | |
1978 | goto error; | |
e5f5db7f | 1979 | } |
6e911cad MD |
1980 | break; |
1981 | case LTTNG_EVENT_SYSCALL: | |
00a62084 MD |
1982 | ret = event_kernel_enable_event(kchan, event, |
1983 | filter_expression, filter); | |
a969e101 MD |
1984 | /* We have passed ownership */ |
1985 | filter_expression = NULL; | |
1986 | filter = NULL; | |
e2b957af MD |
1987 | if (ret != LTTNG_OK) { |
1988 | goto error; | |
1989 | } | |
6e911cad MD |
1990 | break; |
1991 | default: | |
1992 | ret = LTTNG_ERR_UNK; | |
2f77fc4b DG |
1993 | goto error; |
1994 | } | |
1995 | ||
1996 | kernel_wait_quiescent(kernel_tracer_fd); | |
1997 | break; | |
1998 | } | |
1999 | case LTTNG_DOMAIN_UST: | |
2000 | { | |
2001 | struct ltt_ust_channel *uchan; | |
2002 | struct ltt_ust_session *usess = session->ust_session; | |
2003 | ||
2004 | assert(usess); | |
2005 | ||
85076754 MD |
2006 | /* |
2007 | * If a non-default channel has been created in the | |
2008 | * session, explicitely require that -c chan_name needs | |
2009 | * to be provided. | |
2010 | */ | |
2011 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
2012 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
2013 | goto error; | |
2014 | } | |
2015 | ||
2f77fc4b DG |
2016 | /* Get channel from global UST domain */ |
2017 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2018 | channel_name); | |
2019 | if (uchan == NULL) { | |
2020 | /* Create default channel */ | |
0a9c6494 DG |
2021 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
2022 | usess->buffer_type); | |
2f77fc4b | 2023 | if (attr == NULL) { |
f73fabfd | 2024 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2025 | goto error; |
2026 | } | |
04c17253 MD |
2027 | if (lttng_strncpy(attr->name, channel_name, |
2028 | sizeof(attr->name))) { | |
2029 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
2030 | goto error; |
2031 | } | |
2f77fc4b DG |
2032 | |
2033 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 2034 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2035 | goto error; |
2036 | } | |
2f77fc4b DG |
2037 | |
2038 | /* Get the newly created channel reference back */ | |
2039 | uchan = trace_ust_find_channel_by_name( | |
2040 | usess->domain_global.channels, channel_name); | |
2041 | assert(uchan); | |
2042 | } | |
2043 | ||
141feb8c JG |
2044 | if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) { |
2045 | /* | |
2046 | * Don't allow users to add UST events to channels which | |
2047 | * are assigned to a userspace subdomain (JUL, Log4J, | |
2048 | * Python, etc.). | |
2049 | */ | |
2050 | ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN; | |
2051 | goto error; | |
2052 | } | |
2053 | ||
dac8e046 JG |
2054 | if (!internal_event) { |
2055 | /* | |
2056 | * Ensure the event name is not reserved for internal | |
2057 | * use. | |
2058 | */ | |
2059 | ret = validate_ust_event_name(event->name); | |
2060 | if (ret) { | |
2061 | WARN("Userspace event name %s failed validation.", | |
2062 | event->name ? | |
2063 | event->name : "NULL"); | |
2064 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
2065 | goto error; | |
2066 | } | |
2067 | } | |
2068 | ||
2f77fc4b | 2069 | /* At this point, the session and channel exist on the tracer */ |
6b453b5e | 2070 | ret = event_ust_enable_tracepoint(usess, uchan, event, |
88f06f15 JG |
2071 | filter_expression, filter, exclusion, |
2072 | internal_event); | |
49d21f93 MD |
2073 | /* We have passed ownership */ |
2074 | filter_expression = NULL; | |
2075 | filter = NULL; | |
2076 | exclusion = NULL; | |
94382e15 JG |
2077 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2078 | goto already_enabled; | |
2079 | } else if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2080 | goto error; |
2081 | } | |
2082 | break; | |
2083 | } | |
5cdb6027 | 2084 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 2085 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2086 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 2087 | { |
da6c3a50 | 2088 | const char *default_event_name, *default_chan_name; |
fefd409b | 2089 | struct agent *agt; |
f20baf8e DG |
2090 | struct lttng_event uevent; |
2091 | struct lttng_domain tmp_dom; | |
2092 | struct ltt_ust_session *usess = session->ust_session; | |
2093 | ||
2094 | assert(usess); | |
2095 | ||
09a88287 JG |
2096 | if (!agent_tracing_is_enabled()) { |
2097 | DBG("Attempted to enable an event in an agent domain but the agent thread is not running"); | |
2098 | ret = LTTNG_ERR_AGENT_TRACING_DISABLED; | |
2099 | goto error; | |
2100 | } | |
2101 | ||
5cdb6027 | 2102 | agt = trace_ust_find_agent(usess, domain->type); |
fefd409b | 2103 | if (!agt) { |
5cdb6027 | 2104 | agt = agent_create(domain->type); |
fefd409b | 2105 | if (!agt) { |
e5b3c48c | 2106 | ret = LTTNG_ERR_NOMEM; |
fefd409b DG |
2107 | goto error; |
2108 | } | |
2109 | agent_add(agt, usess->agents); | |
2110 | } | |
2111 | ||
022d91ba | 2112 | /* Create the default tracepoint. */ |
996de3c7 | 2113 | memset(&uevent, 0, sizeof(uevent)); |
f20baf8e DG |
2114 | uevent.type = LTTNG_EVENT_TRACEPOINT; |
2115 | uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
51755dc8 JG |
2116 | default_event_name = event_get_default_agent_ust_name( |
2117 | domain->type); | |
da6c3a50 | 2118 | if (!default_event_name) { |
e5b3c48c | 2119 | ret = LTTNG_ERR_FATAL; |
da6c3a50 | 2120 | goto error; |
f43f95a9 | 2121 | } |
da6c3a50 | 2122 | strncpy(uevent.name, default_event_name, sizeof(uevent.name)); |
f20baf8e DG |
2123 | uevent.name[sizeof(uevent.name) - 1] = '\0'; |
2124 | ||
2125 | /* | |
2126 | * The domain type is changed because we are about to enable the | |
2127 | * default channel and event for the JUL domain that are hardcoded. | |
2128 | * This happens in the UST domain. | |
2129 | */ | |
2130 | memcpy(&tmp_dom, domain, sizeof(tmp_dom)); | |
2131 | tmp_dom.type = LTTNG_DOMAIN_UST; | |
2132 | ||
0e115563 DG |
2133 | switch (domain->type) { |
2134 | case LTTNG_DOMAIN_LOG4J: | |
da6c3a50 | 2135 | default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME; |
0e115563 DG |
2136 | break; |
2137 | case LTTNG_DOMAIN_JUL: | |
da6c3a50 | 2138 | default_chan_name = DEFAULT_JUL_CHANNEL_NAME; |
0e115563 DG |
2139 | break; |
2140 | case LTTNG_DOMAIN_PYTHON: | |
2141 | default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
2142 | break; | |
2143 | default: | |
e98a44b0 | 2144 | /* The switch/case we are in makes this impossible */ |
0e115563 | 2145 | assert(0); |
da6c3a50 DG |
2146 | } |
2147 | ||
971da06a | 2148 | { |
8404118c | 2149 | char *filter_expression_copy = NULL; |
51755dc8 | 2150 | struct lttng_filter_bytecode *filter_copy = NULL; |
971da06a JG |
2151 | |
2152 | if (filter) { | |
51755dc8 JG |
2153 | const size_t filter_size = sizeof( |
2154 | struct lttng_filter_bytecode) | |
2155 | + filter->len; | |
2156 | ||
2157 | filter_copy = zmalloc(filter_size); | |
971da06a | 2158 | if (!filter_copy) { |
018096a4 | 2159 | ret = LTTNG_ERR_NOMEM; |
b742e3e2 | 2160 | goto error; |
971da06a | 2161 | } |
51755dc8 | 2162 | memcpy(filter_copy, filter, filter_size); |
971da06a | 2163 | |
8404118c JG |
2164 | filter_expression_copy = |
2165 | strdup(filter_expression); | |
2166 | if (!filter_expression) { | |
2167 | ret = LTTNG_ERR_NOMEM; | |
51755dc8 JG |
2168 | } |
2169 | ||
2170 | if (!filter_expression_copy || !filter_copy) { | |
2171 | free(filter_expression_copy); | |
2172 | free(filter_copy); | |
2173 | goto error; | |
8404118c | 2174 | } |
971da06a JG |
2175 | } |
2176 | ||
88f06f15 | 2177 | ret = cmd_enable_event_internal(session, &tmp_dom, |
971da06a | 2178 | (char *) default_chan_name, |
8404118c JG |
2179 | &uevent, filter_expression_copy, |
2180 | filter_copy, NULL, wpipe); | |
971da06a JG |
2181 | } |
2182 | ||
94382e15 JG |
2183 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2184 | goto already_enabled; | |
2185 | } else if (ret != LTTNG_OK) { | |
f20baf8e DG |
2186 | goto error; |
2187 | } | |
2188 | ||
2189 | /* The wild card * means that everything should be enabled. */ | |
2190 | if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) { | |
8404118c JG |
2191 | ret = event_agent_enable_all(usess, agt, event, filter, |
2192 | filter_expression); | |
f20baf8e | 2193 | } else { |
8404118c JG |
2194 | ret = event_agent_enable(usess, agt, event, filter, |
2195 | filter_expression); | |
f20baf8e | 2196 | } |
51755dc8 JG |
2197 | filter = NULL; |
2198 | filter_expression = NULL; | |
f20baf8e DG |
2199 | if (ret != LTTNG_OK) { |
2200 | goto error; | |
2201 | } | |
2202 | ||
2203 | break; | |
2204 | } | |
2f77fc4b | 2205 | default: |
f73fabfd | 2206 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2207 | goto error; |
2208 | } | |
2209 | ||
f73fabfd | 2210 | ret = LTTNG_OK; |
2f77fc4b | 2211 | |
94382e15 | 2212 | already_enabled: |
2f77fc4b | 2213 | error: |
49d21f93 MD |
2214 | free(filter_expression); |
2215 | free(filter); | |
2216 | free(exclusion); | |
cfedea03 | 2217 | free(attr); |
2223c96f | 2218 | rcu_read_unlock(); |
2f77fc4b DG |
2219 | return ret; |
2220 | } | |
2221 | ||
88f06f15 JG |
2222 | /* |
2223 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2224 | * We own filter, exclusion, and filter_expression. | |
2225 | */ | |
2226 | int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain, | |
2227 | char *channel_name, struct lttng_event *event, | |
2228 | char *filter_expression, | |
2229 | struct lttng_filter_bytecode *filter, | |
2230 | struct lttng_event_exclusion *exclusion, | |
2231 | int wpipe) | |
2232 | { | |
2233 | return _cmd_enable_event(session, domain, channel_name, event, | |
2234 | filter_expression, filter, exclusion, wpipe, false); | |
2235 | } | |
2236 | ||
2237 | /* | |
2238 | * Enable an event which is internal to LTTng. An internal should | |
2239 | * never be made visible to clients and are immune to checks such as | |
2240 | * reserved names. | |
2241 | */ | |
2242 | static int cmd_enable_event_internal(struct ltt_session *session, | |
2243 | struct lttng_domain *domain, | |
2244 | char *channel_name, struct lttng_event *event, | |
2245 | char *filter_expression, | |
2246 | struct lttng_filter_bytecode *filter, | |
2247 | struct lttng_event_exclusion *exclusion, | |
2248 | int wpipe) | |
2249 | { | |
2250 | return _cmd_enable_event(session, domain, channel_name, event, | |
2251 | filter_expression, filter, exclusion, wpipe, true); | |
2252 | } | |
2253 | ||
2f77fc4b DG |
2254 | /* |
2255 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2256 | */ | |
56a37563 JG |
2257 | ssize_t cmd_list_tracepoints(enum lttng_domain_type domain, |
2258 | struct lttng_event **events) | |
2f77fc4b DG |
2259 | { |
2260 | int ret; | |
2261 | ssize_t nb_events = 0; | |
2262 | ||
2263 | switch (domain) { | |
2264 | case LTTNG_DOMAIN_KERNEL: | |
2265 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2266 | if (nb_events < 0) { | |
f73fabfd | 2267 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
2f77fc4b DG |
2268 | goto error; |
2269 | } | |
2270 | break; | |
2271 | case LTTNG_DOMAIN_UST: | |
2272 | nb_events = ust_app_list_events(events); | |
2273 | if (nb_events < 0) { | |
f73fabfd | 2274 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2275 | goto error; |
2276 | } | |
2277 | break; | |
5cdb6027 | 2278 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2279 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2280 | case LTTNG_DOMAIN_PYTHON: |
f60140a1 | 2281 | nb_events = agent_list_events(events, domain); |
3c6a091f DG |
2282 | if (nb_events < 0) { |
2283 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2284 | goto error; | |
2285 | } | |
2286 | break; | |
2f77fc4b | 2287 | default: |
f73fabfd | 2288 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2289 | goto error; |
2290 | } | |
2291 | ||
2292 | return nb_events; | |
2293 | ||
2294 | error: | |
2295 | /* Return negative value to differentiate return code */ | |
2296 | return -ret; | |
2297 | } | |
2298 | ||
2299 | /* | |
2300 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
2301 | */ | |
56a37563 | 2302 | ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain, |
2f77fc4b DG |
2303 | struct lttng_event_field **fields) |
2304 | { | |
2305 | int ret; | |
2306 | ssize_t nb_fields = 0; | |
2307 | ||
2308 | switch (domain) { | |
2309 | case LTTNG_DOMAIN_UST: | |
2310 | nb_fields = ust_app_list_event_fields(fields); | |
2311 | if (nb_fields < 0) { | |
f73fabfd | 2312 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2313 | goto error; |
2314 | } | |
2315 | break; | |
2316 | case LTTNG_DOMAIN_KERNEL: | |
2317 | default: /* fall-through */ | |
f73fabfd | 2318 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2319 | goto error; |
2320 | } | |
2321 | ||
2322 | return nb_fields; | |
2323 | ||
2324 | error: | |
2325 | /* Return negative value to differentiate return code */ | |
2326 | return -ret; | |
2327 | } | |
2328 | ||
834978fd DG |
2329 | ssize_t cmd_list_syscalls(struct lttng_event **events) |
2330 | { | |
2331 | return syscall_table_list(events); | |
2332 | } | |
2333 | ||
a5dfbb9d MD |
2334 | /* |
2335 | * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread. | |
2336 | * | |
2337 | * Called with session lock held. | |
2338 | */ | |
2339 | ssize_t cmd_list_tracker_pids(struct ltt_session *session, | |
56a37563 | 2340 | enum lttng_domain_type domain, int32_t **pids) |
a5dfbb9d MD |
2341 | { |
2342 | int ret; | |
2343 | ssize_t nr_pids = 0; | |
2344 | ||
2345 | switch (domain) { | |
2346 | case LTTNG_DOMAIN_KERNEL: | |
2347 | { | |
2348 | struct ltt_kernel_session *ksess; | |
2349 | ||
2350 | ksess = session->kernel_session; | |
2351 | nr_pids = kernel_list_tracker_pids(ksess, pids); | |
2352 | if (nr_pids < 0) { | |
2353 | ret = LTTNG_ERR_KERN_LIST_FAIL; | |
2354 | goto error; | |
2355 | } | |
2356 | break; | |
2357 | } | |
2358 | case LTTNG_DOMAIN_UST: | |
2359 | { | |
2360 | struct ltt_ust_session *usess; | |
2361 | ||
2362 | usess = session->ust_session; | |
2363 | nr_pids = trace_ust_list_tracker_pids(usess, pids); | |
2364 | if (nr_pids < 0) { | |
2365 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2366 | goto error; | |
2367 | } | |
2368 | break; | |
2369 | } | |
2370 | case LTTNG_DOMAIN_LOG4J: | |
2371 | case LTTNG_DOMAIN_JUL: | |
2372 | case LTTNG_DOMAIN_PYTHON: | |
2373 | default: | |
2374 | ret = LTTNG_ERR_UND; | |
2375 | goto error; | |
2376 | } | |
2377 | ||
2378 | return nr_pids; | |
2379 | ||
2380 | error: | |
2381 | /* Return negative value to differentiate return code */ | |
2382 | return -ret; | |
2383 | } | |
2384 | ||
2f77fc4b DG |
2385 | /* |
2386 | * Command LTTNG_START_TRACE processed by the client thread. | |
a9ad0c8f MD |
2387 | * |
2388 | * Called with session mutex held. | |
2f77fc4b DG |
2389 | */ |
2390 | int cmd_start_trace(struct ltt_session *session) | |
2391 | { | |
2392 | int ret; | |
cde3e505 | 2393 | unsigned long nb_chan = 0; |
2f77fc4b DG |
2394 | struct ltt_kernel_session *ksession; |
2395 | struct ltt_ust_session *usess; | |
2f77fc4b DG |
2396 | |
2397 | assert(session); | |
2398 | ||
2399 | /* Ease our life a bit ;) */ | |
2400 | ksession = session->kernel_session; | |
2401 | usess = session->ust_session; | |
2402 | ||
8382cf6f DG |
2403 | /* Is the session already started? */ |
2404 | if (session->active) { | |
f73fabfd | 2405 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2406 | goto error; |
2407 | } | |
2408 | ||
cde3e505 DG |
2409 | /* |
2410 | * Starting a session without channel is useless since after that it's not | |
2411 | * possible to enable channel thus inform the client. | |
2412 | */ | |
2413 | if (usess && usess->domain_global.channels) { | |
2414 | nb_chan += lttng_ht_get_count(usess->domain_global.channels); | |
2415 | } | |
2416 | if (ksession) { | |
2417 | nb_chan += ksession->channel_count; | |
2418 | } | |
2419 | if (!nb_chan) { | |
2420 | ret = LTTNG_ERR_NO_CHANNEL; | |
2421 | goto error; | |
2422 | } | |
2423 | ||
2f77fc4b DG |
2424 | /* Kernel tracing */ |
2425 | if (ksession != NULL) { | |
9b6c7ec5 DG |
2426 | ret = start_kernel_session(ksession, kernel_tracer_fd); |
2427 | if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2428 | goto error; |
2429 | } | |
2f77fc4b DG |
2430 | } |
2431 | ||
2432 | /* Flag session that trace should start automatically */ | |
2433 | if (usess) { | |
14fb1ebe DG |
2434 | /* |
2435 | * Even though the start trace might fail, flag this session active so | |
2436 | * other application coming in are started by default. | |
2437 | */ | |
2438 | usess->active = 1; | |
2f77fc4b DG |
2439 | |
2440 | ret = ust_app_start_trace_all(usess); | |
2441 | if (ret < 0) { | |
f73fabfd | 2442 | ret = LTTNG_ERR_UST_START_FAIL; |
2f77fc4b DG |
2443 | goto error; |
2444 | } | |
2445 | } | |
2446 | ||
8382cf6f DG |
2447 | /* Flag this after a successful start. */ |
2448 | session->has_been_started = 1; | |
2449 | session->active = 1; | |
9b6c7ec5 | 2450 | |
f73fabfd | 2451 | ret = LTTNG_OK; |
2f77fc4b DG |
2452 | |
2453 | error: | |
2454 | return ret; | |
2455 | } | |
2456 | ||
2457 | /* | |
2458 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2459 | */ | |
2460 | int cmd_stop_trace(struct ltt_session *session) | |
2461 | { | |
2462 | int ret; | |
2463 | struct ltt_kernel_channel *kchan; | |
2464 | struct ltt_kernel_session *ksession; | |
2465 | struct ltt_ust_session *usess; | |
2466 | ||
2467 | assert(session); | |
2468 | ||
2469 | /* Short cut */ | |
2470 | ksession = session->kernel_session; | |
2471 | usess = session->ust_session; | |
2472 | ||
8382cf6f DG |
2473 | /* Session is not active. Skip everythong and inform the client. */ |
2474 | if (!session->active) { | |
f73fabfd | 2475 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
2f77fc4b DG |
2476 | goto error; |
2477 | } | |
2478 | ||
2f77fc4b | 2479 | /* Kernel tracer */ |
14fb1ebe | 2480 | if (ksession && ksession->active) { |
2f77fc4b DG |
2481 | DBG("Stop kernel tracing"); |
2482 | ||
566d8970 MD |
2483 | ret = kernel_stop_session(ksession); |
2484 | if (ret < 0) { | |
2485 | ret = LTTNG_ERR_KERN_STOP_FAIL; | |
2486 | goto error; | |
2487 | } | |
2488 | ||
2489 | kernel_wait_quiescent(kernel_tracer_fd); | |
2490 | ||
2491 | /* Flush metadata after stopping (if exists) */ | |
2f77fc4b DG |
2492 | if (ksession->metadata_stream_fd >= 0) { |
2493 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2494 | if (ret < 0) { | |
2495 | ERR("Kernel metadata flush failed"); | |
2496 | } | |
2497 | } | |
2498 | ||
566d8970 | 2499 | /* Flush all buffers after stopping */ |
2f77fc4b DG |
2500 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2501 | ret = kernel_flush_buffer(kchan); | |
2502 | if (ret < 0) { | |
2503 | ERR("Kernel flush buffer error"); | |
2504 | } | |
2505 | } | |
2506 | ||
14fb1ebe | 2507 | ksession->active = 0; |
2f77fc4b DG |
2508 | } |
2509 | ||
14fb1ebe DG |
2510 | if (usess && usess->active) { |
2511 | /* | |
2512 | * Even though the stop trace might fail, flag this session inactive so | |
2513 | * other application coming in are not started by default. | |
2514 | */ | |
2515 | usess->active = 0; | |
2f77fc4b DG |
2516 | |
2517 | ret = ust_app_stop_trace_all(usess); | |
2518 | if (ret < 0) { | |
f73fabfd | 2519 | ret = LTTNG_ERR_UST_STOP_FAIL; |
2f77fc4b DG |
2520 | goto error; |
2521 | } | |
2522 | } | |
2523 | ||
8382cf6f DG |
2524 | /* Flag inactive after a successful stop. */ |
2525 | session->active = 0; | |
f73fabfd | 2526 | ret = LTTNG_OK; |
2f77fc4b DG |
2527 | |
2528 | error: | |
2529 | return ret; | |
2530 | } | |
2531 | ||
2532 | /* | |
2533 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
2534 | */ | |
bda32d56 JG |
2535 | int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri, |
2536 | struct lttng_uri *uris) | |
2f77fc4b DG |
2537 | { |
2538 | int ret, i; | |
2539 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2540 | struct ltt_ust_session *usess = session->ust_session; | |
2f77fc4b DG |
2541 | |
2542 | assert(session); | |
2543 | assert(uris); | |
2544 | assert(nb_uri > 0); | |
2545 | ||
8382cf6f DG |
2546 | /* Can't set consumer URI if the session is active. */ |
2547 | if (session->active) { | |
f73fabfd | 2548 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2549 | goto error; |
2550 | } | |
2551 | ||
bda32d56 | 2552 | /* Set the "global" consumer URIs */ |
2f77fc4b | 2553 | for (i = 0; i < nb_uri; i++) { |
bda32d56 JG |
2554 | ret = add_uri_to_consumer(session->consumer, |
2555 | &uris[i], 0, session->name); | |
a74934ba | 2556 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2557 | goto error; |
2558 | } | |
2f77fc4b DG |
2559 | } |
2560 | ||
bda32d56 JG |
2561 | /* Set UST session URIs */ |
2562 | if (session->ust_session) { | |
2563 | for (i = 0; i < nb_uri; i++) { | |
2564 | ret = add_uri_to_consumer( | |
2565 | session->ust_session->consumer, | |
2566 | &uris[i], LTTNG_DOMAIN_UST, | |
2567 | session->name); | |
2568 | if (ret != LTTNG_OK) { | |
2569 | goto error; | |
2570 | } | |
2571 | } | |
2572 | } | |
2573 | ||
2574 | /* Set kernel session URIs */ | |
2575 | if (session->kernel_session) { | |
2576 | for (i = 0; i < nb_uri; i++) { | |
2577 | ret = add_uri_to_consumer( | |
2578 | session->kernel_session->consumer, | |
2579 | &uris[i], LTTNG_DOMAIN_KERNEL, | |
2580 | session->name); | |
2581 | if (ret != LTTNG_OK) { | |
2582 | goto error; | |
2583 | } | |
2584 | } | |
2585 | } | |
2586 | ||
7ab70fe0 DG |
2587 | /* |
2588 | * Make sure to set the session in output mode after we set URI since a | |
2589 | * session can be created without URL (thus flagged in no output mode). | |
2590 | */ | |
2591 | session->output_traces = 1; | |
2592 | if (ksess) { | |
2593 | ksess->output_traces = 1; | |
bda32d56 JG |
2594 | } |
2595 | ||
2596 | if (usess) { | |
7ab70fe0 DG |
2597 | usess->output_traces = 1; |
2598 | } | |
2599 | ||
2f77fc4b | 2600 | /* All good! */ |
f73fabfd | 2601 | ret = LTTNG_OK; |
2f77fc4b DG |
2602 | |
2603 | error: | |
2604 | return ret; | |
2605 | } | |
2606 | ||
2607 | /* | |
2608 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2609 | */ | |
2610 | int cmd_create_session_uri(char *name, struct lttng_uri *uris, | |
ecc48a90 | 2611 | size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer) |
2f77fc4b DG |
2612 | { |
2613 | int ret; | |
2f77fc4b DG |
2614 | struct ltt_session *session; |
2615 | ||
2616 | assert(name); | |
2bba9e53 | 2617 | assert(creds); |
785d2d0d | 2618 | |
2f77fc4b DG |
2619 | /* |
2620 | * Verify if the session already exist | |
2621 | * | |
2622 | * XXX: There is no need for the session lock list here since the caller | |
2623 | * (process_client_msg) is holding it. We might want to change that so a | |
2624 | * single command does not lock the entire session list. | |
2625 | */ | |
2626 | session = session_find_by_name(name); | |
2627 | if (session != NULL) { | |
f73fabfd | 2628 | ret = LTTNG_ERR_EXIST_SESS; |
2f77fc4b DG |
2629 | goto find_error; |
2630 | } | |
2631 | ||
2632 | /* Create tracing session in the registry */ | |
dec56f6c | 2633 | ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds), |
2f77fc4b | 2634 | LTTNG_SOCK_GET_GID_CRED(creds)); |
f73fabfd | 2635 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2636 | goto session_error; |
2637 | } | |
2638 | ||
2639 | /* | |
2640 | * Get the newly created session pointer back | |
2641 | * | |
2642 | * XXX: There is no need for the session lock list here since the caller | |
2643 | * (process_client_msg) is holding it. We might want to change that so a | |
2644 | * single command does not lock the entire session list. | |
2645 | */ | |
2646 | session = session_find_by_name(name); | |
2647 | assert(session); | |
2648 | ||
ecc48a90 | 2649 | session->live_timer = live_timer; |
2f77fc4b DG |
2650 | /* Create default consumer output for the session not yet created. */ |
2651 | session->consumer = consumer_create_output(CONSUMER_DST_LOCAL); | |
2652 | if (session->consumer == NULL) { | |
f73fabfd | 2653 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2654 | goto consumer_error; |
2655 | } | |
2656 | ||
2bba9e53 | 2657 | if (uris) { |
bda32d56 | 2658 | ret = cmd_set_consumer_uri(session, nb_uri, uris); |
2bba9e53 DG |
2659 | if (ret != LTTNG_OK) { |
2660 | goto consumer_error; | |
2661 | } | |
2662 | session->output_traces = 1; | |
2663 | } else { | |
2664 | session->output_traces = 0; | |
2665 | DBG2("Session %s created with no output", session->name); | |
2f77fc4b DG |
2666 | } |
2667 | ||
2668 | session->consumer->enabled = 1; | |
2669 | ||
f73fabfd | 2670 | return LTTNG_OK; |
2f77fc4b DG |
2671 | |
2672 | consumer_error: | |
2673 | session_destroy(session); | |
2674 | session_error: | |
2675 | find_error: | |
2676 | return ret; | |
2677 | } | |
2678 | ||
27babd3a DG |
2679 | /* |
2680 | * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread. | |
2681 | */ | |
2682 | int cmd_create_session_snapshot(char *name, struct lttng_uri *uris, | |
2683 | size_t nb_uri, lttng_sock_cred *creds) | |
2684 | { | |
2685 | int ret; | |
2686 | struct ltt_session *session; | |
2687 | struct snapshot_output *new_output = NULL; | |
2688 | ||
2689 | assert(name); | |
2690 | assert(creds); | |
2691 | ||
2692 | /* | |
2693 | * Create session in no output mode with URIs set to NULL. The uris we've | |
2694 | * received are for a default snapshot output if one. | |
2695 | */ | |
ae58b817 | 2696 | ret = cmd_create_session_uri(name, NULL, 0, creds, 0); |
27babd3a DG |
2697 | if (ret != LTTNG_OK) { |
2698 | goto error; | |
2699 | } | |
2700 | ||
2701 | /* Get the newly created session pointer back. This should NEVER fail. */ | |
2702 | session = session_find_by_name(name); | |
2703 | assert(session); | |
2704 | ||
2705 | /* Flag session for snapshot mode. */ | |
2706 | session->snapshot_mode = 1; | |
2707 | ||
2708 | /* Skip snapshot output creation if no URI is given. */ | |
2709 | if (nb_uri == 0) { | |
2710 | goto end; | |
2711 | } | |
2712 | ||
2713 | new_output = snapshot_output_alloc(); | |
2714 | if (!new_output) { | |
2715 | ret = LTTNG_ERR_NOMEM; | |
2716 | goto error_snapshot_alloc; | |
2717 | } | |
2718 | ||
2719 | ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL, | |
2720 | uris, nb_uri, session->consumer, new_output, &session->snapshot); | |
2721 | if (ret < 0) { | |
2722 | if (ret == -ENOMEM) { | |
2723 | ret = LTTNG_ERR_NOMEM; | |
2724 | } else { | |
2725 | ret = LTTNG_ERR_INVALID; | |
2726 | } | |
2727 | goto error_snapshot; | |
2728 | } | |
2729 | ||
2730 | rcu_read_lock(); | |
2731 | snapshot_add_output(&session->snapshot, new_output); | |
2732 | rcu_read_unlock(); | |
2733 | ||
2734 | end: | |
2735 | return LTTNG_OK; | |
2736 | ||
2737 | error_snapshot: | |
2738 | snapshot_output_destroy(new_output); | |
2739 | error_snapshot_alloc: | |
2740 | session_destroy(session); | |
2741 | error: | |
2742 | return ret; | |
2743 | } | |
2744 | ||
2f77fc4b DG |
2745 | /* |
2746 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
a9ad0c8f MD |
2747 | * |
2748 | * Called with session lock held. | |
2f77fc4b DG |
2749 | */ |
2750 | int cmd_destroy_session(struct ltt_session *session, int wpipe) | |
2751 | { | |
2752 | int ret; | |
2753 | struct ltt_ust_session *usess; | |
2754 | struct ltt_kernel_session *ksess; | |
2755 | ||
2756 | /* Safety net */ | |
2757 | assert(session); | |
2758 | ||
2759 | usess = session->ust_session; | |
2760 | ksess = session->kernel_session; | |
2761 | ||
2762 | /* Clean kernel session teardown */ | |
2763 | kernel_destroy_session(ksess); | |
2764 | ||
2765 | /* UST session teardown */ | |
2766 | if (usess) { | |
2767 | /* Close any relayd session */ | |
2768 | consumer_output_send_destroy_relayd(usess->consumer); | |
2769 | ||
2770 | /* Destroy every UST application related to this session. */ | |
2771 | ret = ust_app_destroy_trace_all(usess); | |
2772 | if (ret) { | |
2773 | ERR("Error in ust_app_destroy_trace_all"); | |
2774 | } | |
2775 | ||
2776 | /* Clean up the rest. */ | |
2777 | trace_ust_destroy_session(usess); | |
2778 | } | |
2779 | ||
2780 | /* | |
2781 | * Must notify the kernel thread here to update it's poll set in order to | |
2782 | * remove the channel(s)' fd just destroyed. | |
2783 | */ | |
2784 | ret = notify_thread_pipe(wpipe); | |
2785 | if (ret < 0) { | |
2786 | PERROR("write kernel poll pipe"); | |
2787 | } | |
2788 | ||
2789 | ret = session_destroy(session); | |
2790 | ||
2791 | return ret; | |
2792 | } | |
2793 | ||
2f77fc4b DG |
2794 | /* |
2795 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
2796 | */ | |
56a37563 JG |
2797 | int cmd_register_consumer(struct ltt_session *session, |
2798 | enum lttng_domain_type domain, const char *sock_path, | |
2799 | struct consumer_data *cdata) | |
2f77fc4b DG |
2800 | { |
2801 | int ret, sock; | |
dd81b457 | 2802 | struct consumer_socket *socket = NULL; |
2f77fc4b DG |
2803 | |
2804 | assert(session); | |
2805 | assert(cdata); | |
2806 | assert(sock_path); | |
2807 | ||
2808 | switch (domain) { | |
2809 | case LTTNG_DOMAIN_KERNEL: | |
2810 | { | |
2811 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2812 | ||
2813 | assert(ksess); | |
2814 | ||
2815 | /* Can't register a consumer if there is already one */ | |
2816 | if (ksess->consumer_fds_sent != 0) { | |
f73fabfd | 2817 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
2818 | goto error; |
2819 | } | |
2820 | ||
2821 | sock = lttcomm_connect_unix_sock(sock_path); | |
2822 | if (sock < 0) { | |
f73fabfd | 2823 | ret = LTTNG_ERR_CONNECT_FAIL; |
2f77fc4b DG |
2824 | goto error; |
2825 | } | |
4ce514c4 | 2826 | cdata->cmd_sock = sock; |
2f77fc4b | 2827 | |
4ce514c4 | 2828 | socket = consumer_allocate_socket(&cdata->cmd_sock); |
2f77fc4b | 2829 | if (socket == NULL) { |
f66c074c DG |
2830 | ret = close(sock); |
2831 | if (ret < 0) { | |
2832 | PERROR("close register consumer"); | |
2833 | } | |
4ce514c4 | 2834 | cdata->cmd_sock = -1; |
f73fabfd | 2835 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2836 | goto error; |
2837 | } | |
2838 | ||
2839 | socket->lock = zmalloc(sizeof(pthread_mutex_t)); | |
2840 | if (socket->lock == NULL) { | |
2841 | PERROR("zmalloc pthread mutex"); | |
f73fabfd | 2842 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2843 | goto error; |
2844 | } | |
2845 | pthread_mutex_init(socket->lock, NULL); | |
2846 | socket->registered = 1; | |
2847 | ||
2848 | rcu_read_lock(); | |
2849 | consumer_add_socket(socket, ksess->consumer); | |
2850 | rcu_read_unlock(); | |
2851 | ||
2852 | pthread_mutex_lock(&cdata->pid_mutex); | |
2853 | cdata->pid = -1; | |
2854 | pthread_mutex_unlock(&cdata->pid_mutex); | |
2855 | ||
2856 | break; | |
2857 | } | |
2858 | default: | |
2859 | /* TODO: Userspace tracing */ | |
f73fabfd | 2860 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2861 | goto error; |
2862 | } | |
2863 | ||
dd81b457 | 2864 | return LTTNG_OK; |
2f77fc4b DG |
2865 | |
2866 | error: | |
dd81b457 DG |
2867 | if (socket) { |
2868 | consumer_destroy_socket(socket); | |
2869 | } | |
2f77fc4b DG |
2870 | return ret; |
2871 | } | |
2872 | ||
2873 | /* | |
2874 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
2875 | */ | |
2876 | ssize_t cmd_list_domains(struct ltt_session *session, | |
2877 | struct lttng_domain **domains) | |
2878 | { | |
2879 | int ret, index = 0; | |
2880 | ssize_t nb_dom = 0; | |
fefd409b DG |
2881 | struct agent *agt; |
2882 | struct lttng_ht_iter iter; | |
2f77fc4b DG |
2883 | |
2884 | if (session->kernel_session != NULL) { | |
2885 | DBG3("Listing domains found kernel domain"); | |
2886 | nb_dom++; | |
2887 | } | |
2888 | ||
2889 | if (session->ust_session != NULL) { | |
2890 | DBG3("Listing domains found UST global domain"); | |
2891 | nb_dom++; | |
3c6a091f | 2892 | |
e0a74f01 | 2893 | rcu_read_lock(); |
fefd409b DG |
2894 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2895 | agt, node.node) { | |
2896 | if (agt->being_used) { | |
2897 | nb_dom++; | |
2898 | } | |
3c6a091f | 2899 | } |
e0a74f01 | 2900 | rcu_read_unlock(); |
2f77fc4b DG |
2901 | } |
2902 | ||
fa64dfb4 JG |
2903 | if (!nb_dom) { |
2904 | goto end; | |
2905 | } | |
2906 | ||
2f77fc4b DG |
2907 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
2908 | if (*domains == NULL) { | |
f73fabfd | 2909 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2910 | goto error; |
2911 | } | |
2912 | ||
2913 | if (session->kernel_session != NULL) { | |
2914 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
b5edb9e8 PP |
2915 | |
2916 | /* Kernel session buffer type is always GLOBAL */ | |
2917 | (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL; | |
2918 | ||
2f77fc4b DG |
2919 | index++; |
2920 | } | |
2921 | ||
2922 | if (session->ust_session != NULL) { | |
2923 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
88c5f0d8 | 2924 | (*domains)[index].buf_type = session->ust_session->buffer_type; |
2f77fc4b | 2925 | index++; |
3c6a091f | 2926 | |
e0a74f01 | 2927 | rcu_read_lock(); |
fefd409b DG |
2928 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2929 | agt, node.node) { | |
2930 | if (agt->being_used) { | |
2931 | (*domains)[index].type = agt->domain; | |
2932 | (*domains)[index].buf_type = session->ust_session->buffer_type; | |
2933 | index++; | |
2934 | } | |
3c6a091f | 2935 | } |
e0a74f01 | 2936 | rcu_read_unlock(); |
2f77fc4b | 2937 | } |
fa64dfb4 | 2938 | end: |
2f77fc4b DG |
2939 | return nb_dom; |
2940 | ||
2941 | error: | |
f73fabfd DG |
2942 | /* Return negative value to differentiate return code */ |
2943 | return -ret; | |
2f77fc4b DG |
2944 | } |
2945 | ||
2946 | ||
2947 | /* | |
2948 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
2949 | */ | |
56a37563 JG |
2950 | ssize_t cmd_list_channels(enum lttng_domain_type domain, |
2951 | struct ltt_session *session, struct lttng_channel **channels) | |
2f77fc4b | 2952 | { |
53e367f9 | 2953 | ssize_t nb_chan = 0, payload_size = 0, ret; |
2f77fc4b DG |
2954 | |
2955 | switch (domain) { | |
2956 | case LTTNG_DOMAIN_KERNEL: | |
2957 | if (session->kernel_session != NULL) { | |
2958 | nb_chan = session->kernel_session->channel_count; | |
2959 | } | |
2960 | DBG3("Number of kernel channels %zd", nb_chan); | |
c7d620a2 | 2961 | if (nb_chan <= 0) { |
53e367f9 JG |
2962 | ret = -LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2963 | goto end; | |
c7d620a2 | 2964 | } |
2f77fc4b DG |
2965 | break; |
2966 | case LTTNG_DOMAIN_UST: | |
2967 | if (session->ust_session != NULL) { | |
7ffc31a2 | 2968 | rcu_read_lock(); |
2f77fc4b | 2969 | nb_chan = lttng_ht_get_count( |
7ffc31a2 JG |
2970 | session->ust_session->domain_global.channels); |
2971 | rcu_read_unlock(); | |
2f77fc4b DG |
2972 | } |
2973 | DBG3("Number of UST global channels %zd", nb_chan); | |
ade7ce52 | 2974 | if (nb_chan < 0) { |
53e367f9 JG |
2975 | ret = -LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2976 | goto end; | |
c7d620a2 | 2977 | } |
2f77fc4b DG |
2978 | break; |
2979 | default: | |
53e367f9 JG |
2980 | ret = -LTTNG_ERR_UND; |
2981 | goto end; | |
2f77fc4b DG |
2982 | } |
2983 | ||
2984 | if (nb_chan > 0) { | |
53e367f9 JG |
2985 | const size_t channel_size = sizeof(struct lttng_channel) + |
2986 | sizeof(struct lttcomm_channel_extended); | |
2987 | struct lttcomm_channel_extended *channel_exts; | |
2988 | ||
2989 | payload_size = nb_chan * channel_size; | |
2990 | *channels = zmalloc(payload_size); | |
2f77fc4b | 2991 | if (*channels == NULL) { |
53e367f9 JG |
2992 | ret = -LTTNG_ERR_FATAL; |
2993 | goto end; | |
2f77fc4b DG |
2994 | } |
2995 | ||
53e367f9 JG |
2996 | channel_exts = ((void *) *channels) + |
2997 | (nb_chan * sizeof(struct lttng_channel)); | |
24624ef2 MD |
2998 | ret = list_lttng_channels(domain, session, *channels, channel_exts); |
2999 | if (ret != LTTNG_OK) { | |
3000 | free(*channels); | |
3001 | *channels = NULL; | |
3002 | goto end; | |
3003 | } | |
53e367f9 JG |
3004 | } else { |
3005 | *channels = NULL; | |
2f77fc4b DG |
3006 | } |
3007 | ||
53e367f9 JG |
3008 | ret = payload_size; |
3009 | end: | |
3010 | return ret; | |
2f77fc4b DG |
3011 | } |
3012 | ||
3013 | /* | |
3014 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3015 | */ | |
56a37563 JG |
3016 | ssize_t cmd_list_events(enum lttng_domain_type domain, |
3017 | struct ltt_session *session, char *channel_name, | |
b4e3ceb9 | 3018 | struct lttng_event **events, size_t *total_size) |
2f77fc4b DG |
3019 | { |
3020 | int ret = 0; | |
3021 | ssize_t nb_event = 0; | |
3022 | ||
3023 | switch (domain) { | |
3024 | case LTTNG_DOMAIN_KERNEL: | |
3025 | if (session->kernel_session != NULL) { | |
3026 | nb_event = list_lttng_kernel_events(channel_name, | |
b4e3ceb9 PP |
3027 | session->kernel_session, events, |
3028 | total_size); | |
2f77fc4b DG |
3029 | } |
3030 | break; | |
3031 | case LTTNG_DOMAIN_UST: | |
3032 | { | |
3033 | if (session->ust_session != NULL) { | |
3034 | nb_event = list_lttng_ust_global_events(channel_name, | |
b4e3ceb9 PP |
3035 | &session->ust_session->domain_global, events, |
3036 | total_size); | |
2f77fc4b DG |
3037 | } |
3038 | break; | |
3039 | } | |
5cdb6027 | 3040 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 3041 | case LTTNG_DOMAIN_JUL: |
0e115563 | 3042 | case LTTNG_DOMAIN_PYTHON: |
3c6a091f | 3043 | if (session->ust_session) { |
fefd409b DG |
3044 | struct lttng_ht_iter iter; |
3045 | struct agent *agt; | |
3046 | ||
b11feea5 | 3047 | rcu_read_lock(); |
fefd409b DG |
3048 | cds_lfht_for_each_entry(session->ust_session->agents->ht, |
3049 | &iter.iter, agt, node.node) { | |
1dfd9906 JG |
3050 | if (agt->domain == domain) { |
3051 | nb_event = list_lttng_agent_events( | |
b4e3ceb9 PP |
3052 | agt, events, |
3053 | total_size); | |
1dfd9906 JG |
3054 | break; |
3055 | } | |
fefd409b | 3056 | } |
b11feea5 | 3057 | rcu_read_unlock(); |
3c6a091f DG |
3058 | } |
3059 | break; | |
2f77fc4b | 3060 | default: |
f73fabfd | 3061 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3062 | goto error; |
3063 | } | |
3064 | ||
f73fabfd | 3065 | return nb_event; |
2f77fc4b DG |
3066 | |
3067 | error: | |
f73fabfd DG |
3068 | /* Return negative value to differentiate return code */ |
3069 | return -ret; | |
2f77fc4b DG |
3070 | } |
3071 | ||
3072 | /* | |
3073 | * Using the session list, filled a lttng_session array to send back to the | |
3074 | * client for session listing. | |
3075 | * | |
3076 | * The session list lock MUST be acquired before calling this function. Use | |
3077 | * session_lock_list() and session_unlock_list(). | |
3078 | */ | |
3079 | void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid, | |
3080 | gid_t gid) | |
3081 | { | |
3082 | int ret; | |
3083 | unsigned int i = 0; | |
3084 | struct ltt_session *session; | |
3085 | struct ltt_session_list *list = session_get_list(); | |
3086 | ||
3087 | DBG("Getting all available session for UID %d GID %d", | |
3088 | uid, gid); | |
3089 | /* | |
3090 | * Iterate over session list and append data after the control struct in | |
3091 | * the buffer. | |
3092 | */ | |
3093 | cds_list_for_each_entry(session, &list->head, list) { | |
3094 | /* | |
3095 | * Only list the sessions the user can control. | |
3096 | */ | |
3097 | if (!session_access_ok(session, uid, gid)) { | |
3098 | continue; | |
3099 | } | |
3100 | ||
3101 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3102 | struct ltt_ust_session *usess = session->ust_session; | |
3103 | ||
3104 | if (session->consumer->type == CONSUMER_DST_NET || | |
3105 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
3106 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
3107 | ret = build_network_session_path(sessions[i].path, | |
dec56f6c | 3108 | sizeof(sessions[i].path), session); |
2f77fc4b | 3109 | } else { |
dec56f6c | 3110 | ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s", |
2f77fc4b DG |
3111 | session->consumer->dst.trace_path); |
3112 | } | |
3113 | if (ret < 0) { | |
3114 | PERROR("snprintf session path"); | |
3115 | continue; | |
3116 | } | |
3117 | ||
3118 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
3119 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
8382cf6f | 3120 | sessions[i].enabled = session->active; |
2cbf8fed | 3121 | sessions[i].snapshot_mode = session->snapshot_mode; |
8960e9cd | 3122 | sessions[i].live_timer_interval = session->live_timer; |
2f77fc4b DG |
3123 | i++; |
3124 | } | |
3125 | } | |
3126 | ||
806e2684 | 3127 | /* |
6d805429 | 3128 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
d3f14b8a | 3129 | * ready for trace analysis (or any kind of reader) or else 1 for pending data. |
806e2684 | 3130 | */ |
6d805429 | 3131 | int cmd_data_pending(struct ltt_session *session) |
806e2684 DG |
3132 | { |
3133 | int ret; | |
3134 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3135 | struct ltt_ust_session *usess = session->ust_session; | |
3136 | ||
3137 | assert(session); | |
3138 | ||
3139 | /* Session MUST be stopped to ask for data availability. */ | |
8382cf6f | 3140 | if (session->active) { |
806e2684 DG |
3141 | ret = LTTNG_ERR_SESSION_STARTED; |
3142 | goto error; | |
3a89d11a DG |
3143 | } else { |
3144 | /* | |
3145 | * If stopped, just make sure we've started before else the above call | |
3146 | * will always send that there is data pending. | |
3147 | * | |
3148 | * The consumer assumes that when the data pending command is received, | |
3149 | * the trace has been started before or else no output data is written | |
3150 | * by the streams which is a condition for data pending. So, this is | |
3151 | * *VERY* important that we don't ask the consumer before a start | |
3152 | * trace. | |
3153 | */ | |
8382cf6f | 3154 | if (!session->has_been_started) { |
3a89d11a DG |
3155 | ret = 0; |
3156 | goto error; | |
3157 | } | |
806e2684 DG |
3158 | } |
3159 | ||
3160 | if (ksess && ksess->consumer) { | |
6d805429 DG |
3161 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
3162 | if (ret == 1) { | |
806e2684 DG |
3163 | /* Data is still being extracted for the kernel. */ |
3164 | goto error; | |
3165 | } | |
3166 | } | |
3167 | ||
3168 | if (usess && usess->consumer) { | |
6d805429 DG |
3169 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
3170 | if (ret == 1) { | |
806e2684 DG |
3171 | /* Data is still being extracted for the kernel. */ |
3172 | goto error; | |
3173 | } | |
3174 | } | |
3175 | ||
3176 | /* Data is ready to be read by a viewer */ | |
6d805429 | 3177 | ret = 0; |
806e2684 DG |
3178 | |
3179 | error: | |
3180 | return ret; | |
3181 | } | |
3182 | ||
6dc3064a DG |
3183 | /* |
3184 | * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library. | |
3185 | * | |
3186 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3187 | */ | |
3188 | int cmd_snapshot_add_output(struct ltt_session *session, | |
3189 | struct lttng_snapshot_output *output, uint32_t *id) | |
3190 | { | |
3191 | int ret; | |
3192 | struct snapshot_output *new_output; | |
3193 | ||
3194 | assert(session); | |
3195 | assert(output); | |
3196 | ||
3197 | DBG("Cmd snapshot add output for session %s", session->name); | |
3198 | ||
3199 | /* | |
903ef685 | 3200 | * Can't create an output if the session is not set in no-output mode. |
6dc3064a DG |
3201 | */ |
3202 | if (session->output_traces) { | |
903ef685 | 3203 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3204 | goto error; |
3205 | } | |
3206 | ||
3207 | /* Only one output is allowed until we have the "tee" feature. */ | |
3208 | if (session->snapshot.nb_output == 1) { | |
3209 | ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST; | |
3210 | goto error; | |
3211 | } | |
3212 | ||
3213 | new_output = snapshot_output_alloc(); | |
3214 | if (!new_output) { | |
3215 | ret = LTTNG_ERR_NOMEM; | |
3216 | goto error; | |
3217 | } | |
3218 | ||
3219 | ret = snapshot_output_init(output->max_size, output->name, | |
3220 | output->ctrl_url, output->data_url, session->consumer, new_output, | |
3221 | &session->snapshot); | |
3222 | if (ret < 0) { | |
3223 | if (ret == -ENOMEM) { | |
3224 | ret = LTTNG_ERR_NOMEM; | |
3225 | } else { | |
3226 | ret = LTTNG_ERR_INVALID; | |
3227 | } | |
3228 | goto free_error; | |
3229 | } | |
3230 | ||
6dc3064a DG |
3231 | rcu_read_lock(); |
3232 | snapshot_add_output(&session->snapshot, new_output); | |
3233 | if (id) { | |
3234 | *id = new_output->id; | |
3235 | } | |
3236 | rcu_read_unlock(); | |
3237 | ||
3238 | return LTTNG_OK; | |
3239 | ||
3240 | free_error: | |
3241 | snapshot_output_destroy(new_output); | |
3242 | error: | |
3243 | return ret; | |
3244 | } | |
3245 | ||
3246 | /* | |
3247 | * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl. | |
3248 | * | |
3249 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3250 | */ | |
3251 | int cmd_snapshot_del_output(struct ltt_session *session, | |
3252 | struct lttng_snapshot_output *output) | |
3253 | { | |
3254 | int ret; | |
eb240553 | 3255 | struct snapshot_output *sout = NULL; |
6dc3064a DG |
3256 | |
3257 | assert(session); | |
3258 | assert(output); | |
3259 | ||
6dc3064a DG |
3260 | rcu_read_lock(); |
3261 | ||
3262 | /* | |
d3f14b8a MD |
3263 | * Permission denied to create an output if the session is not |
3264 | * set in no output mode. | |
6dc3064a DG |
3265 | */ |
3266 | if (session->output_traces) { | |
903ef685 | 3267 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3268 | goto error; |
3269 | } | |
3270 | ||
eb240553 DG |
3271 | if (output->id) { |
3272 | DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id, | |
3273 | session->name); | |
3274 | sout = snapshot_find_output_by_id(output->id, &session->snapshot); | |
3275 | } else if (*output->name != '\0') { | |
3276 | DBG("Cmd snapshot del output name %s for session %s", output->name, | |
3277 | session->name); | |
3278 | sout = snapshot_find_output_by_name(output->name, &session->snapshot); | |
3279 | } | |
6dc3064a DG |
3280 | if (!sout) { |
3281 | ret = LTTNG_ERR_INVALID; | |
3282 | goto error; | |
3283 | } | |
3284 | ||
3285 | snapshot_delete_output(&session->snapshot, sout); | |
3286 | snapshot_output_destroy(sout); | |
3287 | ret = LTTNG_OK; | |
3288 | ||
3289 | error: | |
3290 | rcu_read_unlock(); | |
3291 | return ret; | |
3292 | } | |
3293 | ||
3294 | /* | |
3295 | * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl. | |
3296 | * | |
3297 | * If no output is available, outputs is untouched and 0 is returned. | |
3298 | * | |
3299 | * Return the size of the newly allocated outputs or a negative LTTNG_ERR code. | |
3300 | */ | |
3301 | ssize_t cmd_snapshot_list_outputs(struct ltt_session *session, | |
3302 | struct lttng_snapshot_output **outputs) | |
3303 | { | |
3304 | int ret, idx = 0; | |
b223ca94 | 3305 | struct lttng_snapshot_output *list = NULL; |
6dc3064a DG |
3306 | struct lttng_ht_iter iter; |
3307 | struct snapshot_output *output; | |
3308 | ||
3309 | assert(session); | |
3310 | assert(outputs); | |
3311 | ||
3312 | DBG("Cmd snapshot list outputs for session %s", session->name); | |
3313 | ||
3314 | /* | |
d3f14b8a MD |
3315 | * Permission denied to create an output if the session is not |
3316 | * set in no output mode. | |
6dc3064a DG |
3317 | */ |
3318 | if (session->output_traces) { | |
903ef685 JG |
3319 | ret = -LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
3320 | goto end; | |
6dc3064a DG |
3321 | } |
3322 | ||
3323 | if (session->snapshot.nb_output == 0) { | |
3324 | ret = 0; | |
903ef685 | 3325 | goto end; |
6dc3064a DG |
3326 | } |
3327 | ||
3328 | list = zmalloc(session->snapshot.nb_output * sizeof(*list)); | |
3329 | if (!list) { | |
b223ca94 | 3330 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3331 | goto end; |
6dc3064a DG |
3332 | } |
3333 | ||
3334 | /* Copy list from session to the new list object. */ | |
b223ca94 | 3335 | rcu_read_lock(); |
6dc3064a DG |
3336 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter, |
3337 | output, node.node) { | |
3338 | assert(output->consumer); | |
3339 | list[idx].id = output->id; | |
3340 | list[idx].max_size = output->max_size; | |
6ce22875 MD |
3341 | if (lttng_strncpy(list[idx].name, output->name, |
3342 | sizeof(list[idx].name))) { | |
3343 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 3344 | goto error; |
6ce22875 | 3345 | } |
6dc3064a | 3346 | if (output->consumer->type == CONSUMER_DST_LOCAL) { |
6ce22875 MD |
3347 | if (lttng_strncpy(list[idx].ctrl_url, |
3348 | output->consumer->dst.trace_path, | |
3349 | sizeof(list[idx].ctrl_url))) { | |
3350 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 3351 | goto error; |
6ce22875 | 3352 | } |
6dc3064a DG |
3353 | } else { |
3354 | /* Control URI. */ | |
3355 | ret = uri_to_str_url(&output->consumer->dst.net.control, | |
3356 | list[idx].ctrl_url, sizeof(list[idx].ctrl_url)); | |
3357 | if (ret < 0) { | |
b223ca94 | 3358 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3359 | goto error; |
6dc3064a DG |
3360 | } |
3361 | ||
3362 | /* Data URI. */ | |
3363 | ret = uri_to_str_url(&output->consumer->dst.net.data, | |
3364 | list[idx].data_url, sizeof(list[idx].data_url)); | |
3365 | if (ret < 0) { | |
b223ca94 | 3366 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3367 | goto error; |
6dc3064a DG |
3368 | } |
3369 | } | |
3370 | idx++; | |
3371 | } | |
3372 | ||
3373 | *outputs = list; | |
b223ca94 JG |
3374 | list = NULL; |
3375 | ret = session->snapshot.nb_output; | |
6dc3064a | 3376 | error: |
903ef685 | 3377 | rcu_read_unlock(); |
b223ca94 | 3378 | free(list); |
903ef685 | 3379 | end: |
b223ca94 | 3380 | return ret; |
6dc3064a DG |
3381 | } |
3382 | ||
93ec662e JD |
3383 | /* |
3384 | * Check if we can regenerate the metadata for this session. | |
3385 | * Only kernel, UST per-uid and non-live sessions are supported. | |
3386 | * | |
3387 | * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise. | |
3388 | */ | |
3389 | static | |
eded6438 | 3390 | int check_regenerate_metadata_support(struct ltt_session *session) |
93ec662e JD |
3391 | { |
3392 | int ret; | |
3393 | ||
3394 | assert(session); | |
3395 | ||
3396 | if (session->live_timer != 0) { | |
3397 | ret = LTTNG_ERR_LIVE_SESSION; | |
3398 | goto end; | |
3399 | } | |
3400 | if (!session->active) { | |
3401 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
3402 | goto end; | |
3403 | } | |
3404 | if (session->ust_session) { | |
3405 | switch (session->ust_session->buffer_type) { | |
3406 | case LTTNG_BUFFER_PER_UID: | |
3407 | break; | |
3408 | case LTTNG_BUFFER_PER_PID: | |
3409 | ret = LTTNG_ERR_PER_PID_SESSION; | |
3410 | goto end; | |
3411 | default: | |
3412 | assert(0); | |
3413 | ret = LTTNG_ERR_UNK; | |
3414 | goto end; | |
3415 | } | |
3416 | } | |
3417 | if (session->consumer->type == CONSUMER_DST_NET && | |
3418 | session->consumer->relay_minor_version < 8) { | |
3419 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; | |
3420 | goto end; | |
3421 | } | |
3422 | ret = 0; | |
3423 | ||
3424 | end: | |
3425 | return ret; | |
3426 | } | |
3427 | ||
7adcc7bd LL |
3428 | static |
3429 | int clear_metadata_file(int fd) | |
3430 | { | |
3431 | int ret; | |
b61e1dca | 3432 | off_t lseek_ret; |
7adcc7bd | 3433 | |
b61e1dca GL |
3434 | lseek_ret = lseek(fd, 0, SEEK_SET); |
3435 | if (lseek_ret < 0) { | |
7adcc7bd | 3436 | PERROR("lseek"); |
b61e1dca | 3437 | ret = -1; |
7adcc7bd LL |
3438 | goto end; |
3439 | } | |
3440 | ||
3441 | ret = ftruncate(fd, 0); | |
3442 | if (ret < 0) { | |
3443 | PERROR("ftruncate"); | |
3444 | goto end; | |
3445 | } | |
3446 | ||
3447 | end: | |
3448 | return ret; | |
3449 | } | |
3450 | ||
93ec662e | 3451 | static |
eded6438 | 3452 | int ust_regenerate_metadata(struct ltt_ust_session *usess) |
93ec662e JD |
3453 | { |
3454 | int ret = 0; | |
3455 | struct buffer_reg_uid *uid_reg = NULL; | |
3456 | struct buffer_reg_session *session_reg = NULL; | |
3457 | ||
3458 | rcu_read_lock(); | |
3459 | cds_list_for_each_entry(uid_reg, &usess->buffer_reg_uid_list, lnode) { | |
3460 | struct ust_registry_session *registry; | |
3461 | struct ust_registry_channel *chan; | |
3462 | struct lttng_ht_iter iter_chan; | |
3463 | ||
3464 | session_reg = uid_reg->registry; | |
3465 | registry = session_reg->reg.ust; | |
3466 | ||
3467 | pthread_mutex_lock(®istry->lock); | |
3468 | registry->metadata_len_sent = 0; | |
3469 | memset(registry->metadata, 0, registry->metadata_alloc_len); | |
3470 | registry->metadata_len = 0; | |
3471 | registry->metadata_version++; | |
7adcc7bd LL |
3472 | if (registry->metadata_fd > 0) { |
3473 | /* Clear the metadata file's content. */ | |
3474 | ret = clear_metadata_file(registry->metadata_fd); | |
3475 | if (ret) { | |
3476 | pthread_mutex_unlock(®istry->lock); | |
3477 | goto end; | |
3478 | } | |
3479 | } | |
3480 | ||
93ec662e JD |
3481 | ret = ust_metadata_session_statedump(registry, NULL, |
3482 | registry->major, registry->minor); | |
3483 | if (ret) { | |
3484 | pthread_mutex_unlock(®istry->lock); | |
3485 | ERR("Failed to generate session metadata (err = %d)", | |
3486 | ret); | |
3487 | goto end; | |
3488 | } | |
3489 | cds_lfht_for_each_entry(registry->channels->ht, &iter_chan.iter, | |
3490 | chan, node.node) { | |
3491 | struct ust_registry_event *event; | |
3492 | struct lttng_ht_iter iter_event; | |
3493 | ||
3494 | ret = ust_metadata_channel_statedump(registry, chan); | |
3495 | if (ret) { | |
3496 | pthread_mutex_unlock(®istry->lock); | |
3497 | ERR("Failed to generate channel metadata " | |
3498 | "(err = %d)", ret); | |
3499 | goto end; | |
3500 | } | |
3501 | cds_lfht_for_each_entry(chan->ht->ht, &iter_event.iter, | |
3502 | event, node.node) { | |
3503 | ret = ust_metadata_event_statedump(registry, | |
3504 | chan, event); | |
3505 | if (ret) { | |
3506 | pthread_mutex_unlock(®istry->lock); | |
3507 | ERR("Failed to generate event metadata " | |
3508 | "(err = %d)", ret); | |
3509 | goto end; | |
3510 | } | |
3511 | } | |
3512 | } | |
3513 | pthread_mutex_unlock(®istry->lock); | |
3514 | } | |
3515 | ||
3516 | end: | |
3517 | rcu_read_unlock(); | |
3518 | return ret; | |
3519 | } | |
3520 | ||
3521 | /* | |
eded6438 | 3522 | * Command LTTNG_REGENERATE_METADATA from the lttng-ctl library. |
93ec662e JD |
3523 | * |
3524 | * Ask the consumer to truncate the existing metadata file(s) and | |
3525 | * then regenerate the metadata. Live and per-pid sessions are not | |
3526 | * supported and return an error. | |
3527 | * | |
3528 | * Return 0 on success or else a LTTNG_ERR code. | |
3529 | */ | |
eded6438 | 3530 | int cmd_regenerate_metadata(struct ltt_session *session) |
93ec662e JD |
3531 | { |
3532 | int ret; | |
3533 | ||
3534 | assert(session); | |
3535 | ||
eded6438 | 3536 | ret = check_regenerate_metadata_support(session); |
93ec662e JD |
3537 | if (ret) { |
3538 | goto end; | |
3539 | } | |
3540 | ||
3541 | if (session->kernel_session) { | |
eded6438 | 3542 | ret = kernctl_session_regenerate_metadata( |
93ec662e JD |
3543 | session->kernel_session->fd); |
3544 | if (ret < 0) { | |
3545 | ERR("Failed to regenerate the kernel metadata"); | |
3546 | goto end; | |
3547 | } | |
3548 | } | |
3549 | ||
3550 | if (session->ust_session) { | |
eded6438 | 3551 | ret = ust_regenerate_metadata(session->ust_session); |
93ec662e JD |
3552 | if (ret < 0) { |
3553 | ERR("Failed to regenerate the UST metadata"); | |
3554 | goto end; | |
3555 | } | |
3556 | } | |
3557 | DBG("Cmd metadata regenerate for session %s", session->name); | |
3558 | ret = LTTNG_OK; | |
3559 | ||
3560 | end: | |
3561 | return ret; | |
3562 | } | |
3563 | ||
c2561365 JD |
3564 | /* |
3565 | * Command LTTNG_REGENERATE_STATEDUMP from the lttng-ctl library. | |
3566 | * | |
3567 | * Ask the tracer to regenerate a new statedump. | |
3568 | * | |
3569 | * Return 0 on success or else a LTTNG_ERR code. | |
3570 | */ | |
3571 | int cmd_regenerate_statedump(struct ltt_session *session) | |
3572 | { | |
3573 | int ret; | |
3574 | ||
3575 | assert(session); | |
3576 | ||
3577 | if (!session->active) { | |
3578 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
3579 | goto end; | |
3580 | } | |
3581 | ret = 0; | |
3582 | ||
3583 | if (session->kernel_session) { | |
3584 | ret = kernctl_session_regenerate_statedump( | |
3585 | session->kernel_session->fd); | |
3586 | /* | |
3587 | * Currently, the statedump in kernel can only fail if out | |
3588 | * of memory. | |
3589 | */ | |
3590 | if (ret < 0) { | |
3591 | if (ret == -ENOMEM) { | |
3592 | ret = LTTNG_ERR_REGEN_STATEDUMP_NOMEM; | |
3593 | } else { | |
3594 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
3595 | } | |
3596 | ERR("Failed to regenerate the kernel statedump"); | |
3597 | goto end; | |
3598 | } | |
3599 | } | |
3600 | ||
3601 | if (session->ust_session) { | |
3602 | ret = ust_app_regenerate_statedump_all(session->ust_session); | |
3603 | /* | |
3604 | * Currently, the statedump in UST always returns 0. | |
3605 | */ | |
3606 | if (ret < 0) { | |
3607 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
3608 | ERR("Failed to regenerate the UST statedump"); | |
3609 | goto end; | |
3610 | } | |
3611 | } | |
3612 | DBG("Cmd regenerate statedump for session %s", session->name); | |
3613 | ret = LTTNG_OK; | |
3614 | ||
3615 | end: | |
3616 | return ret; | |
3617 | } | |
3618 | ||
6dc3064a DG |
3619 | /* |
3620 | * Send relayd sockets from snapshot output to consumer. Ignore request if the | |
3621 | * snapshot output is *not* set with a remote destination. | |
3622 | * | |
a934f4af | 3623 | * Return 0 on success or a LTTNG_ERR code. |
6dc3064a DG |
3624 | */ |
3625 | static int set_relayd_for_snapshot(struct consumer_output *consumer, | |
3626 | struct snapshot_output *snap_output, struct ltt_session *session) | |
3627 | { | |
a934f4af | 3628 | int ret = LTTNG_OK; |
6dc3064a DG |
3629 | struct lttng_ht_iter iter; |
3630 | struct consumer_socket *socket; | |
3631 | ||
3632 | assert(consumer); | |
3633 | assert(snap_output); | |
3634 | assert(session); | |
3635 | ||
3636 | DBG2("Set relayd object from snapshot output"); | |
3637 | ||
3638 | /* Ignore if snapshot consumer output is not network. */ | |
3639 | if (snap_output->consumer->type != CONSUMER_DST_NET) { | |
3640 | goto error; | |
3641 | } | |
3642 | ||
3643 | /* | |
3644 | * For each consumer socket, create and send the relayd object of the | |
3645 | * snapshot output. | |
3646 | */ | |
3647 | rcu_read_lock(); | |
5eecee74 DG |
3648 | cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter, |
3649 | socket, node.node) { | |
32a57e73 | 3650 | pthread_mutex_lock(socket->lock); |
6dc3064a | 3651 | ret = send_consumer_relayd_sockets(0, session->id, |
d3e2ba59 JD |
3652 | snap_output->consumer, socket, |
3653 | session->name, session->hostname, | |
3654 | session->live_timer); | |
32a57e73 | 3655 | pthread_mutex_unlock(socket->lock); |
a934f4af | 3656 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3657 | rcu_read_unlock(); |
3658 | goto error; | |
3659 | } | |
3660 | } | |
3661 | rcu_read_unlock(); | |
3662 | ||
3663 | error: | |
3664 | return ret; | |
3665 | } | |
3666 | ||
3667 | /* | |
3668 | * Record a kernel snapshot. | |
3669 | * | |
fac41e72 | 3670 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a DG |
3671 | */ |
3672 | static int record_kernel_snapshot(struct ltt_kernel_session *ksess, | |
5c786ded | 3673 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3674 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3675 | { |
3676 | int ret; | |
3677 | ||
3678 | assert(ksess); | |
3679 | assert(output); | |
3680 | assert(session); | |
3681 | ||
10a50311 | 3682 | |
af706bb7 DG |
3683 | /* |
3684 | * Copy kernel session sockets so we can communicate with the right | |
3685 | * consumer for the snapshot record command. | |
3686 | */ | |
3687 | ret = consumer_copy_sockets(output->consumer, ksess->consumer); | |
3688 | if (ret < 0) { | |
a934f4af | 3689 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3690 | goto error; |
6dc3064a DG |
3691 | } |
3692 | ||
3693 | ret = set_relayd_for_snapshot(ksess->consumer, output, session); | |
a934f4af | 3694 | if (ret != LTTNG_OK) { |
af706bb7 | 3695 | goto error_snapshot; |
6dc3064a DG |
3696 | } |
3697 | ||
d07ceecd | 3698 | ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream); |
2a06df8d | 3699 | if (ret != LTTNG_OK) { |
af706bb7 | 3700 | goto error_snapshot; |
6dc3064a DG |
3701 | } |
3702 | ||
a934f4af | 3703 | ret = LTTNG_OK; |
1371fc12 | 3704 | goto end; |
a934f4af | 3705 | |
af706bb7 DG |
3706 | error_snapshot: |
3707 | /* Clean up copied sockets so this output can use some other later on. */ | |
3708 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a | 3709 | error: |
1371fc12 | 3710 | end: |
6dc3064a DG |
3711 | return ret; |
3712 | } | |
3713 | ||
3714 | /* | |
3715 | * Record a UST snapshot. | |
3716 | * | |
a934f4af | 3717 | * Return 0 on success or a LTTNG_ERR error code. |
6dc3064a DG |
3718 | */ |
3719 | static int record_ust_snapshot(struct ltt_ust_session *usess, | |
5c786ded | 3720 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3721 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3722 | { |
3723 | int ret; | |
3724 | ||
3725 | assert(usess); | |
3726 | assert(output); | |
3727 | assert(session); | |
3728 | ||
af706bb7 | 3729 | /* |
d3f14b8a | 3730 | * Copy UST session sockets so we can communicate with the right |
af706bb7 DG |
3731 | * consumer for the snapshot record command. |
3732 | */ | |
3733 | ret = consumer_copy_sockets(output->consumer, usess->consumer); | |
3734 | if (ret < 0) { | |
a934f4af | 3735 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3736 | goto error; |
6dc3064a DG |
3737 | } |
3738 | ||
3739 | ret = set_relayd_for_snapshot(usess->consumer, output, session); | |
a934f4af | 3740 | if (ret != LTTNG_OK) { |
af706bb7 | 3741 | goto error_snapshot; |
6dc3064a DG |
3742 | } |
3743 | ||
d07ceecd | 3744 | ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream); |
6dc3064a | 3745 | if (ret < 0) { |
7badf927 DG |
3746 | switch (-ret) { |
3747 | case EINVAL: | |
a934f4af | 3748 | ret = LTTNG_ERR_INVALID; |
7badf927 | 3749 | break; |
7badf927 DG |
3750 | default: |
3751 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
3752 | break; | |
5c786ded | 3753 | } |
af706bb7 | 3754 | goto error_snapshot; |
6dc3064a DG |
3755 | } |
3756 | ||
a934f4af DG |
3757 | ret = LTTNG_OK; |
3758 | ||
af706bb7 DG |
3759 | error_snapshot: |
3760 | /* Clean up copied sockets so this output can use some other later on. */ | |
3761 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a DG |
3762 | error: |
3763 | return ret; | |
3764 | } | |
3765 | ||
d07ceecd MD |
3766 | static |
3767 | uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session, | |
3768 | uint64_t cur_nr_packets) | |
68808f4e | 3769 | { |
d07ceecd | 3770 | uint64_t tot_size = 0; |
68808f4e DG |
3771 | |
3772 | if (session->kernel_session) { | |
3773 | struct ltt_kernel_channel *chan; | |
3774 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3775 | ||
68808f4e | 3776 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
d07ceecd MD |
3777 | if (cur_nr_packets >= chan->channel->attr.num_subbuf) { |
3778 | /* | |
3779 | * Don't take channel into account if we | |
3780 | * already grab all its packets. | |
3781 | */ | |
3782 | continue; | |
68808f4e | 3783 | } |
d07ceecd MD |
3784 | tot_size += chan->channel->attr.subbuf_size |
3785 | * chan->stream_count; | |
68808f4e DG |
3786 | } |
3787 | } | |
3788 | ||
3789 | if (session->ust_session) { | |
68808f4e DG |
3790 | struct ltt_ust_session *usess = session->ust_session; |
3791 | ||
d07ceecd MD |
3792 | tot_size += ust_app_get_size_one_more_packet_per_stream(usess, |
3793 | cur_nr_packets); | |
68808f4e DG |
3794 | } |
3795 | ||
d07ceecd | 3796 | return tot_size; |
68808f4e DG |
3797 | } |
3798 | ||
5c786ded | 3799 | /* |
d07ceecd MD |
3800 | * Calculate the number of packets we can grab from each stream that |
3801 | * fits within the overall snapshot max size. | |
3802 | * | |
3803 | * Returns -1 on error, 0 means infinite number of packets, else > 0 is | |
3804 | * the number of packets per stream. | |
3805 | * | |
3806 | * TODO: this approach is not perfect: we consider the worse case | |
3807 | * (packet filling the sub-buffers) as an upper bound, but we could do | |
3808 | * better if we do this calculation while we actually grab the packet | |
3809 | * content: we would know how much padding we don't actually store into | |
3810 | * the file. | |
3811 | * | |
3812 | * This algorithm is currently bounded by the number of packets per | |
3813 | * stream. | |
3814 | * | |
3815 | * Since we call this algorithm before actually grabbing the data, it's | |
3816 | * an approximation: for instance, applications could appear/disappear | |
3817 | * in between this call and actually grabbing data. | |
5c786ded | 3818 | */ |
d07ceecd MD |
3819 | static |
3820 | int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size) | |
5c786ded | 3821 | { |
d07ceecd MD |
3822 | int64_t size_left; |
3823 | uint64_t cur_nb_packets = 0; | |
5c786ded | 3824 | |
d07ceecd MD |
3825 | if (!max_size) { |
3826 | return 0; /* Infinite */ | |
5c786ded JD |
3827 | } |
3828 | ||
d07ceecd MD |
3829 | size_left = max_size; |
3830 | for (;;) { | |
3831 | uint64_t one_more_packet_tot_size; | |
5c786ded | 3832 | |
d07ceecd MD |
3833 | one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session, |
3834 | cur_nb_packets); | |
3835 | if (!one_more_packet_tot_size) { | |
3836 | /* We are already grabbing all packets. */ | |
3837 | break; | |
3838 | } | |
3839 | size_left -= one_more_packet_tot_size; | |
3840 | if (size_left < 0) { | |
3841 | break; | |
3842 | } | |
3843 | cur_nb_packets++; | |
5c786ded | 3844 | } |
d07ceecd MD |
3845 | if (!cur_nb_packets) { |
3846 | /* Not enough room to grab one packet of each stream, error. */ | |
3847 | return -1; | |
3848 | } | |
3849 | return cur_nb_packets; | |
5c786ded JD |
3850 | } |
3851 | ||
6dc3064a DG |
3852 | /* |
3853 | * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl. | |
3854 | * | |
3855 | * The wait parameter is ignored so this call always wait for the snapshot to | |
3856 | * complete before returning. | |
3857 | * | |
3858 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3859 | */ | |
3860 | int cmd_snapshot_record(struct ltt_session *session, | |
3861 | struct lttng_snapshot_output *output, int wait) | |
3862 | { | |
3863 | int ret = LTTNG_OK; | |
e1986656 DG |
3864 | unsigned int use_tmp_output = 0; |
3865 | struct snapshot_output tmp_output; | |
00e1dfc4 | 3866 | unsigned int snapshot_success = 0; |
10ba83fe | 3867 | char datetime[16]; |
6dc3064a DG |
3868 | |
3869 | assert(session); | |
ba45d9f0 | 3870 | assert(output); |
6dc3064a DG |
3871 | |
3872 | DBG("Cmd snapshot record for session %s", session->name); | |
3873 | ||
10ba83fe JR |
3874 | /* Get the datetime for the snapshot output directory. */ |
3875 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", datetime, | |
3876 | sizeof(datetime)); | |
3877 | if (!ret) { | |
3878 | ret = LTTNG_ERR_INVALID; | |
3879 | goto error; | |
3880 | } | |
3881 | ||
6dc3064a | 3882 | /* |
d3f14b8a MD |
3883 | * Permission denied to create an output if the session is not |
3884 | * set in no output mode. | |
6dc3064a DG |
3885 | */ |
3886 | if (session->output_traces) { | |
903ef685 | 3887 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3888 | goto error; |
3889 | } | |
3890 | ||
3891 | /* The session needs to be started at least once. */ | |
8382cf6f | 3892 | if (!session->has_been_started) { |
6dc3064a DG |
3893 | ret = LTTNG_ERR_START_SESSION_ONCE; |
3894 | goto error; | |
3895 | } | |
3896 | ||
3897 | /* Use temporary output for the session. */ | |
ba45d9f0 | 3898 | if (*output->ctrl_url != '\0') { |
6dc3064a DG |
3899 | ret = snapshot_output_init(output->max_size, output->name, |
3900 | output->ctrl_url, output->data_url, session->consumer, | |
e1986656 | 3901 | &tmp_output, NULL); |
6dc3064a DG |
3902 | if (ret < 0) { |
3903 | if (ret == -ENOMEM) { | |
3904 | ret = LTTNG_ERR_NOMEM; | |
3905 | } else { | |
3906 | ret = LTTNG_ERR_INVALID; | |
3907 | } | |
3908 | goto error; | |
3909 | } | |
1bfe7328 DG |
3910 | /* Use the global session count for the temporary snapshot. */ |
3911 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; | |
10ba83fe JR |
3912 | |
3913 | /* Use the global datetime */ | |
3914 | memcpy(tmp_output.datetime, datetime, sizeof(datetime)); | |
e1986656 | 3915 | use_tmp_output = 1; |
6dc3064a DG |
3916 | } |
3917 | ||
804c90a8 JR |
3918 | if (use_tmp_output) { |
3919 | int64_t nb_packets_per_stream; | |
6dc3064a | 3920 | |
804c90a8 JR |
3921 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, |
3922 | tmp_output.max_size); | |
3923 | if (nb_packets_per_stream < 0) { | |
3924 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
3925 | goto error; | |
3926 | } | |
d07ceecd | 3927 | |
804c90a8 JR |
3928 | if (session->kernel_session) { |
3929 | ret = record_kernel_snapshot(session->kernel_session, | |
3930 | &tmp_output, session, | |
3931 | wait, nb_packets_per_stream); | |
3932 | if (ret != LTTNG_OK) { | |
d07ceecd MD |
3933 | goto error; |
3934 | } | |
804c90a8 JR |
3935 | } |
3936 | ||
3937 | if (session->ust_session) { | |
3938 | ret = record_ust_snapshot(session->ust_session, | |
3939 | &tmp_output, session, | |
d07ceecd | 3940 | wait, nb_packets_per_stream); |
a934f4af | 3941 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3942 | goto error; |
3943 | } | |
804c90a8 | 3944 | } |
e1986656 | 3945 | |
804c90a8 JR |
3946 | snapshot_success = 1; |
3947 | } else { | |
3948 | struct snapshot_output *sout; | |
3949 | struct lttng_ht_iter iter; | |
68808f4e | 3950 | |
804c90a8 JR |
3951 | rcu_read_lock(); |
3952 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
3953 | &iter.iter, sout, node.node) { | |
3954 | int64_t nb_packets_per_stream; | |
e1986656 | 3955 | |
804c90a8 JR |
3956 | /* |
3957 | * Make a local copy of the output and assign the possible | |
3958 | * temporary value given by the caller. | |
3959 | */ | |
3960 | memset(&tmp_output, 0, sizeof(tmp_output)); | |
3961 | memcpy(&tmp_output, sout, sizeof(tmp_output)); | |
1bfe7328 | 3962 | |
804c90a8 JR |
3963 | if (output->max_size != (uint64_t) -1ULL) { |
3964 | tmp_output.max_size = output->max_size; | |
6dc3064a | 3965 | } |
d07ceecd MD |
3966 | |
3967 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
3968 | tmp_output.max_size); | |
3969 | if (nb_packets_per_stream < 0) { | |
3970 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
804c90a8 | 3971 | rcu_read_unlock(); |
d07ceecd MD |
3972 | goto error; |
3973 | } | |
6dc3064a | 3974 | |
804c90a8 JR |
3975 | /* Use temporary name. */ |
3976 | if (*output->name != '\0') { | |
cf3e357d MD |
3977 | if (lttng_strncpy(tmp_output.name, output->name, |
3978 | sizeof(tmp_output.name))) { | |
3979 | ret = LTTNG_ERR_INVALID; | |
3980 | rcu_read_unlock(); | |
3981 | goto error; | |
3982 | } | |
804c90a8 | 3983 | } |
e1986656 | 3984 | |
804c90a8 | 3985 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; |
10ba83fe | 3986 | memcpy(tmp_output.datetime, datetime, sizeof(datetime)); |
e1986656 | 3987 | |
804c90a8 JR |
3988 | if (session->kernel_session) { |
3989 | ret = record_kernel_snapshot(session->kernel_session, | |
3990 | &tmp_output, session, | |
3991 | wait, nb_packets_per_stream); | |
3992 | if (ret != LTTNG_OK) { | |
d07ceecd | 3993 | rcu_read_unlock(); |
68808f4e DG |
3994 | goto error; |
3995 | } | |
804c90a8 | 3996 | } |
68808f4e | 3997 | |
804c90a8 JR |
3998 | if (session->ust_session) { |
3999 | ret = record_ust_snapshot(session->ust_session, | |
4000 | &tmp_output, session, | |
d07ceecd | 4001 | wait, nb_packets_per_stream); |
a934f4af | 4002 | if (ret != LTTNG_OK) { |
6dc3064a DG |
4003 | rcu_read_unlock(); |
4004 | goto error; | |
4005 | } | |
4006 | } | |
804c90a8 | 4007 | snapshot_success = 1; |
6dc3064a | 4008 | } |
804c90a8 | 4009 | rcu_read_unlock(); |
6dc3064a DG |
4010 | } |
4011 | ||
1bfe7328 DG |
4012 | if (snapshot_success) { |
4013 | session->snapshot.nb_snapshot++; | |
b67578cb MD |
4014 | } else { |
4015 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
1bfe7328 DG |
4016 | } |
4017 | ||
6dc3064a | 4018 | error: |
6dc3064a DG |
4019 | return ret; |
4020 | } | |
4021 | ||
d7ba1388 MD |
4022 | /* |
4023 | * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread. | |
4024 | */ | |
4025 | int cmd_set_session_shm_path(struct ltt_session *session, | |
4026 | const char *shm_path) | |
4027 | { | |
4028 | /* Safety net */ | |
4029 | assert(session); | |
4030 | ||
4031 | /* | |
4032 | * Can only set shm path before session is started. | |
4033 | */ | |
4034 | if (session->has_been_started) { | |
4035 | return LTTNG_ERR_SESSION_STARTED; | |
4036 | } | |
4037 | ||
4038 | strncpy(session->shm_path, shm_path, | |
4039 | sizeof(session->shm_path)); | |
4040 | session->shm_path[sizeof(session->shm_path) - 1] = '\0'; | |
4041 | ||
4042 | return 0; | |
4043 | } | |
4044 | ||
2f77fc4b DG |
4045 | /* |
4046 | * Init command subsystem. | |
4047 | */ | |
4048 | void cmd_init(void) | |
4049 | { | |
4050 | /* | |
d88aee68 DG |
4051 | * Set network sequence index to 1 for streams to match a relayd |
4052 | * socket on the consumer side. | |
2f77fc4b | 4053 | */ |
d88aee68 DG |
4054 | pthread_mutex_lock(&relayd_net_seq_idx_lock); |
4055 | relayd_net_seq_idx = 1; | |
4056 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
4057 | |
4058 | DBG("Command subsystem initialized"); | |
4059 | } |