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