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> |
db671df9 | 32 | #include <lttng/trigger/trigger-internal.h> |
2f77fc4b DG |
33 | |
34 | #include "channel.h" | |
35 | #include "consumer.h" | |
36 | #include "event.h" | |
8782cc74 | 37 | #include "health-sessiond.h" |
2f77fc4b DG |
38 | #include "kernel.h" |
39 | #include "kernel-consumer.h" | |
40 | #include "lttng-sessiond.h" | |
41 | #include "utils.h" | |
834978fd | 42 | #include "syscall.h" |
7c1d2758 | 43 | #include "agent.h" |
93ec662e | 44 | #include "buffer-registry.h" |
2f77fc4b DG |
45 | |
46 | #include "cmd.h" | |
47 | ||
48 | /* | |
49 | * Used to keep a unique index for each relayd socket created where this value | |
50 | * is associated with streams on the consumer so it can match the right relayd | |
d88aee68 DG |
51 | * to send to. It must be accessed with the relayd_net_seq_idx_lock |
52 | * held. | |
2f77fc4b | 53 | */ |
d88aee68 DG |
54 | static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER; |
55 | static uint64_t relayd_net_seq_idx; | |
2f77fc4b | 56 | |
7076b56e JG |
57 | static int validate_event_name(const char *); |
58 | static int validate_ust_event_name(const char *); | |
59 | static int cmd_enable_event_internal(struct ltt_session *session, | |
60 | struct lttng_domain *domain, | |
61 | char *channel_name, struct lttng_event *event, | |
62 | char *filter_expression, | |
63 | struct lttng_filter_bytecode *filter, | |
64 | struct lttng_event_exclusion *exclusion, | |
65 | int wpipe); | |
66 | ||
2f77fc4b DG |
67 | /* |
68 | * Create a session path used by list_lttng_sessions for the case that the | |
69 | * session consumer is on the network. | |
70 | */ | |
71 | static int build_network_session_path(char *dst, size_t size, | |
72 | struct ltt_session *session) | |
73 | { | |
74 | int ret, kdata_port, udata_port; | |
75 | struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL; | |
76 | char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX]; | |
77 | ||
78 | assert(session); | |
79 | assert(dst); | |
80 | ||
81 | memset(tmp_urls, 0, sizeof(tmp_urls)); | |
82 | memset(tmp_uurl, 0, sizeof(tmp_uurl)); | |
83 | ||
84 | kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT; | |
85 | ||
86 | if (session->kernel_session && session->kernel_session->consumer) { | |
87 | kuri = &session->kernel_session->consumer->dst.net.control; | |
88 | kdata_port = session->kernel_session->consumer->dst.net.data.port; | |
89 | } | |
90 | ||
91 | if (session->ust_session && session->ust_session->consumer) { | |
92 | uuri = &session->ust_session->consumer->dst.net.control; | |
93 | udata_port = session->ust_session->consumer->dst.net.data.port; | |
94 | } | |
95 | ||
96 | if (uuri == NULL && kuri == NULL) { | |
97 | uri = &session->consumer->dst.net.control; | |
98 | kdata_port = session->consumer->dst.net.data.port; | |
99 | } else if (kuri && uuri) { | |
100 | ret = uri_compare(kuri, uuri); | |
101 | if (ret) { | |
102 | /* Not Equal */ | |
103 | uri = kuri; | |
104 | /* Build uuri URL string */ | |
105 | ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl)); | |
106 | if (ret < 0) { | |
107 | goto error; | |
108 | } | |
109 | } else { | |
110 | uri = kuri; | |
111 | } | |
112 | } else if (kuri && uuri == NULL) { | |
113 | uri = kuri; | |
114 | } else if (uuri && kuri == NULL) { | |
115 | uri = uuri; | |
116 | } | |
117 | ||
118 | ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls)); | |
119 | if (ret < 0) { | |
120 | goto error; | |
121 | } | |
122 | ||
9aa9f900 DG |
123 | /* |
124 | * Do we have a UST url set. If yes, this means we have both kernel and UST | |
125 | * to print. | |
126 | */ | |
9d035200 | 127 | if (*tmp_uurl != '\0') { |
2f77fc4b DG |
128 | ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]", |
129 | tmp_urls, kdata_port, tmp_uurl, udata_port); | |
130 | } else { | |
9aa9f900 | 131 | int dport; |
bef08707 | 132 | if (kuri || (!kuri && !uuri)) { |
9aa9f900 DG |
133 | dport = kdata_port; |
134 | } else { | |
135 | /* No kernel URI, use the UST port. */ | |
136 | dport = udata_port; | |
137 | } | |
138 | ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport); | |
2f77fc4b DG |
139 | } |
140 | ||
141 | error: | |
142 | return ret; | |
143 | } | |
144 | ||
fb83fe64 JD |
145 | /* |
146 | * Get run-time attributes if the session has been started (discarded events, | |
147 | * lost packets). | |
148 | */ | |
149 | static int get_kernel_runtime_stats(struct ltt_session *session, | |
150 | struct ltt_kernel_channel *kchan, uint64_t *discarded_events, | |
151 | uint64_t *lost_packets) | |
152 | { | |
153 | int ret; | |
154 | ||
155 | if (!session->has_been_started) { | |
156 | ret = 0; | |
157 | *discarded_events = 0; | |
158 | *lost_packets = 0; | |
159 | goto end; | |
160 | } | |
161 | ||
162 | ret = consumer_get_discarded_events(session->id, kchan->fd, | |
163 | session->kernel_session->consumer, | |
164 | discarded_events); | |
165 | if (ret < 0) { | |
166 | goto end; | |
167 | } | |
168 | ||
169 | ret = consumer_get_lost_packets(session->id, kchan->fd, | |
170 | session->kernel_session->consumer, | |
171 | lost_packets); | |
172 | if (ret < 0) { | |
173 | goto end; | |
174 | } | |
175 | ||
176 | end: | |
177 | return ret; | |
178 | } | |
179 | ||
180 | /* | |
181 | * Get run-time attributes if the session has been started (discarded events, | |
182 | * lost packets). | |
183 | */ | |
184 | static int get_ust_runtime_stats(struct ltt_session *session, | |
185 | struct ltt_ust_channel *uchan, uint64_t *discarded_events, | |
186 | uint64_t *lost_packets) | |
187 | { | |
188 | int ret; | |
189 | struct ltt_ust_session *usess; | |
190 | ||
a91c5803 JG |
191 | if (!discarded_events || !lost_packets) { |
192 | ret = -1; | |
193 | goto end; | |
194 | } | |
195 | ||
fb83fe64 | 196 | usess = session->ust_session; |
a905c624 JG |
197 | assert(discarded_events); |
198 | assert(lost_packets); | |
fb83fe64 JD |
199 | |
200 | if (!usess || !session->has_been_started) { | |
201 | *discarded_events = 0; | |
202 | *lost_packets = 0; | |
203 | ret = 0; | |
204 | goto end; | |
205 | } | |
206 | ||
207 | if (usess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
208 | ret = ust_app_uid_get_channel_runtime_stats(usess->id, | |
209 | &usess->buffer_reg_uid_list, | |
210 | usess->consumer, uchan->id, | |
211 | uchan->attr.overwrite, | |
212 | discarded_events, | |
213 | lost_packets); | |
214 | } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
215 | ret = ust_app_pid_get_channel_runtime_stats(usess, | |
216 | uchan, usess->consumer, | |
217 | uchan->attr.overwrite, | |
218 | discarded_events, | |
219 | lost_packets); | |
220 | if (ret < 0) { | |
221 | goto end; | |
222 | } | |
223 | *discarded_events += uchan->per_pid_closed_app_discarded; | |
224 | *lost_packets += uchan->per_pid_closed_app_lost; | |
225 | } else { | |
226 | ERR("Unsupported buffer type"); | |
967bc289 | 227 | assert(0); |
fb83fe64 JD |
228 | ret = -1; |
229 | goto end; | |
230 | } | |
231 | ||
232 | end: | |
233 | return ret; | |
234 | } | |
235 | ||
2f77fc4b DG |
236 | /* |
237 | * Fill lttng_channel array of all channels. | |
238 | */ | |
56a37563 | 239 | static void list_lttng_channels(enum lttng_domain_type domain, |
fb83fe64 JD |
240 | struct ltt_session *session, struct lttng_channel *channels, |
241 | struct lttcomm_channel_extended *chan_exts) | |
2f77fc4b | 242 | { |
fb83fe64 | 243 | int i = 0, ret; |
2f77fc4b DG |
244 | struct ltt_kernel_channel *kchan; |
245 | ||
246 | DBG("Listing channels for session %s", session->name); | |
247 | ||
248 | switch (domain) { | |
249 | case LTTNG_DOMAIN_KERNEL: | |
250 | /* Kernel channels */ | |
251 | if (session->kernel_session != NULL) { | |
252 | cds_list_for_each_entry(kchan, | |
253 | &session->kernel_session->channel_list.head, list) { | |
fb83fe64 JD |
254 | uint64_t discarded_events, lost_packets; |
255 | ||
256 | ret = get_kernel_runtime_stats(session, kchan, | |
257 | &discarded_events, &lost_packets); | |
258 | if (ret < 0) { | |
259 | goto end; | |
260 | } | |
2f77fc4b DG |
261 | /* Copy lttng_channel struct to array */ |
262 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
263 | channels[i].enabled = kchan->enabled; | |
fb83fe64 JD |
264 | chan_exts[i].discarded_events = |
265 | discarded_events; | |
266 | chan_exts[i].lost_packets = lost_packets; | |
2f77fc4b DG |
267 | i++; |
268 | } | |
269 | } | |
270 | break; | |
271 | case LTTNG_DOMAIN_UST: | |
272 | { | |
273 | struct lttng_ht_iter iter; | |
274 | struct ltt_ust_channel *uchan; | |
275 | ||
e7fe706f | 276 | rcu_read_lock(); |
2f77fc4b DG |
277 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
278 | &iter.iter, uchan, node.node) { | |
a91c5803 | 279 | uint64_t discarded_events = 0, lost_packets = 0; |
fb83fe64 | 280 | |
8ee609c8 MD |
281 | if (lttng_strncpy(channels[i].name, uchan->name, |
282 | LTTNG_SYMBOL_NAME_LEN)) { | |
283 | break; | |
284 | } | |
2f77fc4b DG |
285 | channels[i].attr.overwrite = uchan->attr.overwrite; |
286 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
287 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
288 | channels[i].attr.switch_timer_interval = | |
289 | uchan->attr.switch_timer_interval; | |
290 | channels[i].attr.read_timer_interval = | |
291 | uchan->attr.read_timer_interval; | |
292 | channels[i].enabled = uchan->enabled; | |
2f785fe7 DG |
293 | channels[i].attr.tracefile_size = uchan->tracefile_size; |
294 | channels[i].attr.tracefile_count = uchan->tracefile_count; | |
5e4435a4 JG |
295 | |
296 | /* | |
297 | * Map enum lttng_ust_output to enum lttng_event_output. | |
298 | */ | |
2f77fc4b DG |
299 | switch (uchan->attr.output) { |
300 | case LTTNG_UST_MMAP: | |
2f77fc4b DG |
301 | channels[i].attr.output = LTTNG_EVENT_MMAP; |
302 | break; | |
5e4435a4 JG |
303 | default: |
304 | /* | |
305 | * LTTNG_UST_MMAP is the only supported UST | |
306 | * output mode. | |
307 | */ | |
308 | assert(0); | |
309 | break; | |
2f77fc4b | 310 | } |
fb83fe64 JD |
311 | |
312 | ret = get_ust_runtime_stats(session, uchan, | |
313 | &discarded_events, &lost_packets); | |
314 | if (ret < 0) { | |
315 | break; | |
316 | } | |
317 | chan_exts[i].discarded_events = discarded_events; | |
318 | chan_exts[i].lost_packets = lost_packets; | |
2f77fc4b DG |
319 | i++; |
320 | } | |
e7fe706f | 321 | rcu_read_unlock(); |
2f77fc4b DG |
322 | break; |
323 | } | |
324 | default: | |
325 | break; | |
326 | } | |
fb83fe64 JD |
327 | |
328 | end: | |
329 | return; | |
2f77fc4b DG |
330 | } |
331 | ||
b4e3ceb9 | 332 | static void increment_extended_len(const char *filter_expression, |
795d57ce | 333 | struct lttng_event_exclusion *exclusion, size_t *extended_len) |
b4e3ceb9 PP |
334 | { |
335 | *extended_len += sizeof(struct lttcomm_event_extended_header); | |
336 | ||
337 | if (filter_expression) { | |
338 | *extended_len += strlen(filter_expression) + 1; | |
339 | } | |
795d57ce PP |
340 | |
341 | if (exclusion) { | |
342 | *extended_len += exclusion->count * LTTNG_SYMBOL_NAME_LEN; | |
343 | } | |
b4e3ceb9 PP |
344 | } |
345 | ||
346 | static void append_extended_info(const char *filter_expression, | |
795d57ce | 347 | struct lttng_event_exclusion *exclusion, void **extended_at) |
b4e3ceb9 PP |
348 | { |
349 | struct lttcomm_event_extended_header extended_header; | |
350 | size_t filter_len = 0; | |
795d57ce | 351 | size_t nb_exclusions = 0; |
b4e3ceb9 PP |
352 | |
353 | if (filter_expression) { | |
354 | filter_len = strlen(filter_expression) + 1; | |
355 | } | |
356 | ||
795d57ce PP |
357 | if (exclusion) { |
358 | nb_exclusions = exclusion->count; | |
359 | } | |
360 | ||
361 | /* Set header fields */ | |
b4e3ceb9 | 362 | extended_header.filter_len = filter_len; |
795d57ce PP |
363 | extended_header.nb_exclusions = nb_exclusions; |
364 | ||
365 | /* Copy header */ | |
b4e3ceb9 PP |
366 | memcpy(*extended_at, &extended_header, sizeof(extended_header)); |
367 | *extended_at += sizeof(extended_header); | |
795d57ce PP |
368 | |
369 | /* Copy filter string */ | |
370 | if (filter_expression) { | |
371 | memcpy(*extended_at, filter_expression, filter_len); | |
372 | *extended_at += filter_len; | |
373 | } | |
374 | ||
375 | /* Copy exclusion names */ | |
376 | if (exclusion) { | |
377 | size_t len = nb_exclusions * LTTNG_SYMBOL_NAME_LEN; | |
378 | ||
379 | memcpy(*extended_at, &exclusion->names, len); | |
380 | *extended_at += len; | |
381 | } | |
b4e3ceb9 PP |
382 | } |
383 | ||
3c6a091f | 384 | /* |
022d91ba | 385 | * Create a list of agent domain events. |
3c6a091f DG |
386 | * |
387 | * Return number of events in list on success or else a negative value. | |
388 | */ | |
022d91ba | 389 | static int list_lttng_agent_events(struct agent *agt, |
b4e3ceb9 | 390 | struct lttng_event **events, size_t *total_size) |
3c6a091f DG |
391 | { |
392 | int i = 0, ret = 0; | |
393 | unsigned int nb_event = 0; | |
022d91ba | 394 | struct agent_event *event; |
3c6a091f DG |
395 | struct lttng_event *tmp_events; |
396 | struct lttng_ht_iter iter; | |
b4e3ceb9 PP |
397 | size_t extended_len = 0; |
398 | void *extended_at; | |
3c6a091f | 399 | |
022d91ba | 400 | assert(agt); |
3c6a091f DG |
401 | assert(events); |
402 | ||
022d91ba | 403 | DBG3("Listing agent events"); |
3c6a091f | 404 | |
e5bbf678 | 405 | rcu_read_lock(); |
022d91ba | 406 | nb_event = lttng_ht_get_count(agt->events); |
e5bbf678 | 407 | rcu_read_unlock(); |
3c6a091f DG |
408 | if (nb_event == 0) { |
409 | ret = nb_event; | |
b4e3ceb9 | 410 | *total_size = 0; |
3c6a091f DG |
411 | goto error; |
412 | } | |
413 | ||
b4e3ceb9 PP |
414 | /* Compute required extended infos size */ |
415 | extended_len = nb_event * sizeof(struct lttcomm_event_extended_header); | |
416 | ||
417 | /* | |
418 | * This is only valid because the commands which add events are | |
419 | * processed in the same thread as the listing. | |
420 | */ | |
421 | rcu_read_lock(); | |
422 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { | |
795d57ce PP |
423 | increment_extended_len(event->filter_expression, NULL, |
424 | &extended_len); | |
b4e3ceb9 PP |
425 | } |
426 | rcu_read_unlock(); | |
427 | ||
428 | *total_size = nb_event * sizeof(*tmp_events) + extended_len; | |
429 | tmp_events = zmalloc(*total_size); | |
3c6a091f | 430 | if (!tmp_events) { |
022d91ba | 431 | PERROR("zmalloc agent events session"); |
3c6a091f DG |
432 | ret = -LTTNG_ERR_FATAL; |
433 | goto error; | |
434 | } | |
435 | ||
b4e3ceb9 PP |
436 | extended_at = ((uint8_t *) tmp_events) + |
437 | nb_event * sizeof(struct lttng_event); | |
438 | ||
3c6a091f | 439 | rcu_read_lock(); |
022d91ba | 440 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
3c6a091f DG |
441 | strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name)); |
442 | tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0'; | |
443 | tmp_events[i].enabled = event->enabled; | |
2106efa0 | 444 | tmp_events[i].loglevel = event->loglevel_value; |
ff94328f | 445 | tmp_events[i].loglevel_type = event->loglevel_type; |
3c6a091f | 446 | i++; |
b4e3ceb9 PP |
447 | |
448 | /* Append extended info */ | |
795d57ce PP |
449 | append_extended_info(event->filter_expression, NULL, |
450 | &extended_at); | |
3c6a091f DG |
451 | } |
452 | rcu_read_unlock(); | |
453 | ||
454 | *events = tmp_events; | |
455 | ret = nb_event; | |
456 | ||
457 | error: | |
458 | assert(nb_event == i); | |
459 | return ret; | |
460 | } | |
461 | ||
2f77fc4b DG |
462 | /* |
463 | * Create a list of ust global domain events. | |
464 | */ | |
465 | static int list_lttng_ust_global_events(char *channel_name, | |
b4e3ceb9 PP |
466 | struct ltt_ust_domain_global *ust_global, |
467 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
468 | { |
469 | int i = 0, ret = 0; | |
470 | unsigned int nb_event = 0; | |
471 | struct lttng_ht_iter iter; | |
472 | struct lttng_ht_node_str *node; | |
473 | struct ltt_ust_channel *uchan; | |
474 | struct ltt_ust_event *uevent; | |
475 | struct lttng_event *tmp; | |
b4e3ceb9 PP |
476 | size_t extended_len = 0; |
477 | void *extended_at; | |
2f77fc4b DG |
478 | |
479 | DBG("Listing UST global events for channel %s", channel_name); | |
480 | ||
481 | rcu_read_lock(); | |
482 | ||
483 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); | |
484 | node = lttng_ht_iter_get_node_str(&iter); | |
485 | if (node == NULL) { | |
f73fabfd | 486 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
d31d3e8c | 487 | goto end; |
2f77fc4b DG |
488 | } |
489 | ||
490 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); | |
491 | ||
3c442be3 | 492 | nb_event = lttng_ht_get_count(uchan->events); |
2f77fc4b DG |
493 | if (nb_event == 0) { |
494 | ret = nb_event; | |
b4e3ceb9 | 495 | *total_size = 0; |
d31d3e8c | 496 | goto end; |
2f77fc4b DG |
497 | } |
498 | ||
499 | DBG3("Listing UST global %d events", nb_event); | |
500 | ||
b4e3ceb9 PP |
501 | /* Compute required extended infos size */ |
502 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { | |
503 | if (uevent->internal) { | |
504 | nb_event--; | |
505 | continue; | |
506 | } | |
507 | ||
508 | increment_extended_len(uevent->filter_expression, | |
795d57ce | 509 | uevent->exclusion, &extended_len); |
b4e3ceb9 | 510 | } |
d31d3e8c PP |
511 | if (nb_event == 0) { |
512 | /* All events are internal, skip. */ | |
513 | ret = 0; | |
514 | *total_size = 0; | |
515 | goto end; | |
516 | } | |
b4e3ceb9 PP |
517 | |
518 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
519 | tmp = zmalloc(*total_size); | |
2f77fc4b | 520 | if (tmp == NULL) { |
b12c38df JG |
521 | ret = -LTTNG_ERR_FATAL; |
522 | goto end; | |
2f77fc4b DG |
523 | } |
524 | ||
b4e3ceb9 PP |
525 | extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event); |
526 | ||
2f77fc4b | 527 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
3c442be3 JG |
528 | if (uevent->internal) { |
529 | /* This event should remain hidden from clients */ | |
3c442be3 JG |
530 | continue; |
531 | } | |
2f77fc4b DG |
532 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
533 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
534 | tmp[i].enabled = uevent->enabled; | |
535 | ||
536 | switch (uevent->attr.instrumentation) { | |
537 | case LTTNG_UST_TRACEPOINT: | |
538 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
539 | break; | |
540 | case LTTNG_UST_PROBE: | |
541 | tmp[i].type = LTTNG_EVENT_PROBE; | |
542 | break; | |
543 | case LTTNG_UST_FUNCTION: | |
544 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
545 | break; | |
546 | } | |
547 | ||
548 | tmp[i].loglevel = uevent->attr.loglevel; | |
549 | switch (uevent->attr.loglevel_type) { | |
550 | case LTTNG_UST_LOGLEVEL_ALL: | |
551 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
552 | break; | |
553 | case LTTNG_UST_LOGLEVEL_RANGE: | |
554 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; | |
555 | break; | |
556 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
557 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; | |
558 | break; | |
559 | } | |
560 | if (uevent->filter) { | |
561 | tmp[i].filter = 1; | |
562 | } | |
4634f12e JI |
563 | if (uevent->exclusion) { |
564 | tmp[i].exclusion = 1; | |
565 | } | |
2f77fc4b | 566 | i++; |
b4e3ceb9 PP |
567 | |
568 | /* Append extended info */ | |
795d57ce PP |
569 | append_extended_info(uevent->filter_expression, |
570 | uevent->exclusion, &extended_at); | |
2f77fc4b DG |
571 | } |
572 | ||
573 | ret = nb_event; | |
574 | *events = tmp; | |
d31d3e8c | 575 | end: |
2f77fc4b DG |
576 | rcu_read_unlock(); |
577 | return ret; | |
578 | } | |
579 | ||
580 | /* | |
581 | * Fill lttng_event array of all kernel events in the channel. | |
582 | */ | |
583 | static int list_lttng_kernel_events(char *channel_name, | |
b4e3ceb9 PP |
584 | struct ltt_kernel_session *kernel_session, |
585 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
586 | { |
587 | int i = 0, ret; | |
588 | unsigned int nb_event; | |
589 | struct ltt_kernel_event *event; | |
590 | struct ltt_kernel_channel *kchan; | |
b4e3ceb9 PP |
591 | size_t extended_len = 0; |
592 | void *extended_at; | |
2f77fc4b DG |
593 | |
594 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
595 | if (kchan == NULL) { | |
f73fabfd | 596 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
597 | goto error; |
598 | } | |
599 | ||
600 | nb_event = kchan->event_count; | |
601 | ||
602 | DBG("Listing events for channel %s", kchan->channel->name); | |
603 | ||
604 | if (nb_event == 0) { | |
b4e3ceb9 | 605 | *total_size = 0; |
834978fd | 606 | *events = NULL; |
db906c12 | 607 | goto end; |
2f77fc4b DG |
608 | } |
609 | ||
b4e3ceb9 PP |
610 | /* Compute required extended infos size */ |
611 | cds_list_for_each_entry(event, &kchan->events_list.head, list) { | |
795d57ce PP |
612 | increment_extended_len(event->filter_expression, NULL, |
613 | &extended_len); | |
b4e3ceb9 PP |
614 | } |
615 | ||
616 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
617 | *events = zmalloc(*total_size); | |
2f77fc4b | 618 | if (*events == NULL) { |
f73fabfd | 619 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
620 | goto error; |
621 | } | |
622 | ||
ab4aa612 | 623 | extended_at = ((void *) *events) + |
b4e3ceb9 PP |
624 | nb_event * sizeof(struct lttng_event); |
625 | ||
2f77fc4b DG |
626 | /* Kernel channels */ |
627 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
628 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
629 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
630 | (*events)[i].enabled = event->enabled; | |
00f992f2 JG |
631 | (*events)[i].filter = |
632 | (unsigned char) !!event->filter_expression; | |
2f77fc4b DG |
633 | |
634 | switch (event->event->instrumentation) { | |
635 | case LTTNG_KERNEL_TRACEPOINT: | |
636 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; | |
637 | break; | |
2f77fc4b | 638 | case LTTNG_KERNEL_KRETPROBE: |
1896972b DG |
639 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
640 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
641 | sizeof(struct lttng_kernel_kprobe)); | |
642 | break; | |
643 | case LTTNG_KERNEL_KPROBE: | |
2f77fc4b DG |
644 | (*events)[i].type = LTTNG_EVENT_PROBE; |
645 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
646 | sizeof(struct lttng_kernel_kprobe)); | |
647 | break; | |
648 | case LTTNG_KERNEL_FUNCTION: | |
649 | (*events)[i].type = LTTNG_EVENT_FUNCTION; | |
650 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
651 | sizeof(struct lttng_kernel_function)); | |
652 | break; | |
653 | case LTTNG_KERNEL_NOOP: | |
654 | (*events)[i].type = LTTNG_EVENT_NOOP; | |
655 | break; | |
656 | case LTTNG_KERNEL_SYSCALL: | |
657 | (*events)[i].type = LTTNG_EVENT_SYSCALL; | |
658 | break; | |
659 | case LTTNG_KERNEL_ALL: | |
660 | assert(0); | |
661 | break; | |
662 | } | |
663 | i++; | |
b4e3ceb9 PP |
664 | |
665 | /* Append extended info */ | |
795d57ce PP |
666 | append_extended_info(event->filter_expression, NULL, |
667 | &extended_at); | |
2f77fc4b DG |
668 | } |
669 | ||
db906c12 | 670 | end: |
2f77fc4b DG |
671 | return nb_event; |
672 | ||
673 | error: | |
f73fabfd DG |
674 | /* Negate the error code to differentiate the size from an error */ |
675 | return -ret; | |
2f77fc4b DG |
676 | } |
677 | ||
678 | /* | |
679 | * Add URI so the consumer output object. Set the correct path depending on the | |
680 | * domain adding the default trace directory. | |
681 | */ | |
682 | static int add_uri_to_consumer(struct consumer_output *consumer, | |
56a37563 JG |
683 | struct lttng_uri *uri, enum lttng_domain_type domain, |
684 | const char *session_name) | |
2f77fc4b | 685 | { |
f73fabfd | 686 | int ret = LTTNG_OK; |
2f77fc4b DG |
687 | const char *default_trace_dir; |
688 | ||
689 | assert(uri); | |
690 | ||
691 | if (consumer == NULL) { | |
692 | DBG("No consumer detected. Don't add URI. Stopping."); | |
f73fabfd | 693 | ret = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
694 | goto error; |
695 | } | |
696 | ||
697 | switch (domain) { | |
698 | case LTTNG_DOMAIN_KERNEL: | |
699 | default_trace_dir = DEFAULT_KERNEL_TRACE_DIR; | |
700 | break; | |
701 | case LTTNG_DOMAIN_UST: | |
702 | default_trace_dir = DEFAULT_UST_TRACE_DIR; | |
703 | break; | |
704 | default: | |
705 | /* | |
706 | * This case is possible is we try to add the URI to the global tracing | |
707 | * session consumer object which in this case there is no subdir. | |
708 | */ | |
709 | default_trace_dir = ""; | |
710 | } | |
711 | ||
712 | switch (uri->dtype) { | |
713 | case LTTNG_DST_IPV4: | |
714 | case LTTNG_DST_IPV6: | |
715 | DBG2("Setting network URI to consumer"); | |
716 | ||
df75acac DG |
717 | if (consumer->type == CONSUMER_DST_NET) { |
718 | if ((uri->stype == LTTNG_STREAM_CONTROL && | |
785d2d0d DG |
719 | consumer->dst.net.control_isset) || |
720 | (uri->stype == LTTNG_STREAM_DATA && | |
721 | consumer->dst.net.data_isset)) { | |
df75acac DG |
722 | ret = LTTNG_ERR_URL_EXIST; |
723 | goto error; | |
724 | } | |
725 | } else { | |
726 | memset(&consumer->dst.net, 0, sizeof(consumer->dst.net)); | |
785d2d0d DG |
727 | } |
728 | ||
df75acac DG |
729 | consumer->type = CONSUMER_DST_NET; |
730 | ||
2f77fc4b DG |
731 | /* Set URI into consumer output object */ |
732 | ret = consumer_set_network_uri(consumer, uri); | |
733 | if (ret < 0) { | |
a74934ba | 734 | ret = -ret; |
2f77fc4b DG |
735 | goto error; |
736 | } else if (ret == 1) { | |
737 | /* | |
738 | * URI was the same in the consumer so we do not append the subdir | |
739 | * again so to not duplicate output dir. | |
740 | */ | |
f86c9f4e | 741 | ret = LTTNG_OK; |
2f77fc4b DG |
742 | goto error; |
743 | } | |
744 | ||
745 | if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) { | |
746 | ret = consumer_set_subdir(consumer, session_name); | |
747 | if (ret < 0) { | |
f73fabfd | 748 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
749 | goto error; |
750 | } | |
751 | } | |
752 | ||
753 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
754 | /* On a new subdir, reappend the default trace dir. */ | |
c30ce0b3 CB |
755 | strncat(consumer->subdir, default_trace_dir, |
756 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
757 | DBG3("Append domain trace name to subdir %s", consumer->subdir); |
758 | } | |
759 | ||
760 | break; | |
761 | case LTTNG_DST_PATH: | |
762 | DBG2("Setting trace directory path from URI to %s", uri->dst.path); | |
763 | memset(consumer->dst.trace_path, 0, | |
764 | sizeof(consumer->dst.trace_path)); | |
9ac05d92 MD |
765 | /* Explicit length checks for strcpy and strcat. */ |
766 | if (strlen(uri->dst.path) + strlen(default_trace_dir) | |
767 | >= sizeof(consumer->dst.trace_path)) { | |
768 | ret = LTTNG_ERR_FATAL; | |
769 | goto error; | |
770 | } | |
771 | strcpy(consumer->dst.trace_path, uri->dst.path); | |
2f77fc4b | 772 | /* Append default trace dir */ |
9ac05d92 | 773 | strcat(consumer->dst.trace_path, default_trace_dir); |
2f77fc4b DG |
774 | /* Flag consumer as local. */ |
775 | consumer->type = CONSUMER_DST_LOCAL; | |
776 | break; | |
777 | } | |
778 | ||
a74934ba DG |
779 | ret = LTTNG_OK; |
780 | ||
2f77fc4b DG |
781 | error: |
782 | return ret; | |
783 | } | |
784 | ||
785 | /* | |
786 | * Init tracing by creating trace directory and sending fds kernel consumer. | |
787 | */ | |
788 | static int init_kernel_tracing(struct ltt_kernel_session *session) | |
789 | { | |
790 | int ret = 0; | |
791 | struct lttng_ht_iter iter; | |
792 | struct consumer_socket *socket; | |
793 | ||
794 | assert(session); | |
795 | ||
e7fe706f DG |
796 | rcu_read_lock(); |
797 | ||
2f77fc4b DG |
798 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { |
799 | cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter, | |
800 | socket, node.node) { | |
2f77fc4b | 801 | pthread_mutex_lock(socket->lock); |
f50f23d9 | 802 | ret = kernel_consumer_send_session(socket, session); |
2f77fc4b DG |
803 | pthread_mutex_unlock(socket->lock); |
804 | if (ret < 0) { | |
f73fabfd | 805 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
806 | goto error; |
807 | } | |
808 | } | |
809 | } | |
810 | ||
811 | error: | |
e7fe706f | 812 | rcu_read_unlock(); |
2f77fc4b DG |
813 | return ret; |
814 | } | |
815 | ||
816 | /* | |
817 | * Create a socket to the relayd using the URI. | |
818 | * | |
819 | * On success, the relayd_sock pointer is set to the created socket. | |
820 | * Else, it's stays untouched and a lttcomm error code is returned. | |
821 | */ | |
6151a90f | 822 | static int create_connect_relayd(struct lttng_uri *uri, |
b31610f2 JD |
823 | struct lttcomm_relayd_sock **relayd_sock, |
824 | struct consumer_output *consumer) | |
2f77fc4b DG |
825 | { |
826 | int ret; | |
6151a90f | 827 | struct lttcomm_relayd_sock *rsock; |
2f77fc4b | 828 | |
6151a90f JD |
829 | rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR, |
830 | RELAYD_VERSION_COMM_MINOR); | |
831 | if (!rsock) { | |
f73fabfd | 832 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
833 | goto error; |
834 | } | |
835 | ||
ffe60014 DG |
836 | /* |
837 | * Connect to relayd so we can proceed with a session creation. This call | |
838 | * can possibly block for an arbitrary amount of time to set the health | |
839 | * state to be in poll execution. | |
840 | */ | |
841 | health_poll_entry(); | |
6151a90f | 842 | ret = relayd_connect(rsock); |
ffe60014 | 843 | health_poll_exit(); |
2f77fc4b DG |
844 | if (ret < 0) { |
845 | ERR("Unable to reach lttng-relayd"); | |
f73fabfd | 846 | ret = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
847 | goto free_sock; |
848 | } | |
849 | ||
850 | /* Create socket for control stream. */ | |
851 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
852 | DBG3("Creating relayd stream socket from URI"); | |
853 | ||
854 | /* Check relayd version */ | |
6151a90f | 855 | ret = relayd_version_check(rsock); |
2f77fc4b | 856 | if (ret < 0) { |
f73fabfd | 857 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; |
2f77fc4b DG |
858 | goto close_sock; |
859 | } | |
b31610f2 JD |
860 | consumer->relay_major_version = rsock->major; |
861 | consumer->relay_minor_version = rsock->minor; | |
2f77fc4b DG |
862 | } else if (uri->stype == LTTNG_STREAM_DATA) { |
863 | DBG3("Creating relayd data socket from URI"); | |
864 | } else { | |
865 | /* Command is not valid */ | |
866 | ERR("Relayd invalid stream type: %d", uri->stype); | |
f73fabfd | 867 | ret = LTTNG_ERR_INVALID; |
2f77fc4b DG |
868 | goto close_sock; |
869 | } | |
870 | ||
6151a90f | 871 | *relayd_sock = rsock; |
2f77fc4b | 872 | |
f73fabfd | 873 | return LTTNG_OK; |
2f77fc4b DG |
874 | |
875 | close_sock: | |
6151a90f JD |
876 | /* The returned value is not useful since we are on an error path. */ |
877 | (void) relayd_close(rsock); | |
2f77fc4b | 878 | free_sock: |
6151a90f | 879 | free(rsock); |
2f77fc4b DG |
880 | error: |
881 | return ret; | |
882 | } | |
883 | ||
884 | /* | |
885 | * Connect to the relayd using URI and send the socket to the right consumer. | |
886 | */ | |
56a37563 JG |
887 | static int send_consumer_relayd_socket(enum lttng_domain_type domain, |
888 | unsigned int session_id, struct lttng_uri *relayd_uri, | |
889 | struct consumer_output *consumer, | |
d3e2ba59 JD |
890 | struct consumer_socket *consumer_sock, |
891 | char *session_name, char *hostname, int session_live_timer) | |
2f77fc4b DG |
892 | { |
893 | int ret; | |
6151a90f | 894 | struct lttcomm_relayd_sock *rsock = NULL; |
2f77fc4b | 895 | |
ffe60014 | 896 | /* Connect to relayd and make version check if uri is the control. */ |
b31610f2 | 897 | ret = create_connect_relayd(relayd_uri, &rsock, consumer); |
ffe60014 | 898 | if (ret != LTTNG_OK) { |
6151a90f | 899 | goto error; |
ffe60014 | 900 | } |
6151a90f | 901 | assert(rsock); |
ffe60014 | 902 | |
2f77fc4b | 903 | /* Set the network sequence index if not set. */ |
d88aee68 DG |
904 | if (consumer->net_seq_index == (uint64_t) -1ULL) { |
905 | pthread_mutex_lock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
906 | /* |
907 | * Increment net_seq_idx because we are about to transfer the | |
908 | * new relayd socket to the consumer. | |
d88aee68 | 909 | * Assign unique key so the consumer can match streams. |
2f77fc4b | 910 | */ |
d88aee68 DG |
911 | consumer->net_seq_index = ++relayd_net_seq_idx; |
912 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
913 | } |
914 | ||
2f77fc4b | 915 | /* Send relayd socket to consumer. */ |
6151a90f | 916 | ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer, |
d3e2ba59 JD |
917 | relayd_uri->stype, session_id, |
918 | session_name, hostname, session_live_timer); | |
2f77fc4b | 919 | if (ret < 0) { |
f73fabfd | 920 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
921 | goto close_sock; |
922 | } | |
923 | ||
c890b720 DG |
924 | /* Flag that the corresponding socket was sent. */ |
925 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
ffe60014 | 926 | consumer_sock->control_sock_sent = 1; |
c890b720 | 927 | } else if (relayd_uri->stype == LTTNG_STREAM_DATA) { |
ffe60014 | 928 | consumer_sock->data_sock_sent = 1; |
c890b720 DG |
929 | } |
930 | ||
f73fabfd | 931 | ret = LTTNG_OK; |
2f77fc4b DG |
932 | |
933 | /* | |
934 | * Close socket which was dup on the consumer side. The session daemon does | |
935 | * NOT keep track of the relayd socket(s) once transfer to the consumer. | |
936 | */ | |
937 | ||
938 | close_sock: | |
6151a90f JD |
939 | (void) relayd_close(rsock); |
940 | free(rsock); | |
2f77fc4b | 941 | |
6151a90f | 942 | error: |
ffe60014 DG |
943 | if (ret != LTTNG_OK) { |
944 | /* | |
d9078d0c DG |
945 | * The consumer output for this session should not be used anymore |
946 | * since the relayd connection failed thus making any tracing or/and | |
947 | * streaming not usable. | |
ffe60014 | 948 | */ |
d9078d0c | 949 | consumer->enabled = 0; |
ffe60014 | 950 | } |
2f77fc4b DG |
951 | return ret; |
952 | } | |
953 | ||
954 | /* | |
955 | * Send both relayd sockets to a specific consumer and domain. This is a | |
956 | * helper function to facilitate sending the information to the consumer for a | |
957 | * session. | |
958 | */ | |
56a37563 JG |
959 | static int send_consumer_relayd_sockets(enum lttng_domain_type domain, |
960 | unsigned int session_id, struct consumer_output *consumer, | |
961 | struct consumer_socket *sock, char *session_name, | |
962 | char *hostname, int session_live_timer) | |
2f77fc4b | 963 | { |
dda67f6c | 964 | int ret = LTTNG_OK; |
2f77fc4b | 965 | |
2f77fc4b | 966 | assert(consumer); |
6dc3064a | 967 | assert(sock); |
2f77fc4b | 968 | |
2f77fc4b | 969 | /* Sending control relayd socket. */ |
ffe60014 | 970 | if (!sock->control_sock_sent) { |
6dc3064a | 971 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
972 | &consumer->dst.net.control, consumer, sock, |
973 | session_name, hostname, session_live_timer); | |
c890b720 DG |
974 | if (ret != LTTNG_OK) { |
975 | goto error; | |
976 | } | |
2f77fc4b DG |
977 | } |
978 | ||
979 | /* Sending data relayd socket. */ | |
ffe60014 | 980 | if (!sock->data_sock_sent) { |
6dc3064a | 981 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
982 | &consumer->dst.net.data, consumer, sock, |
983 | session_name, hostname, session_live_timer); | |
c890b720 DG |
984 | if (ret != LTTNG_OK) { |
985 | goto error; | |
986 | } | |
2f77fc4b DG |
987 | } |
988 | ||
2f77fc4b DG |
989 | error: |
990 | return ret; | |
991 | } | |
992 | ||
993 | /* | |
994 | * Setup relayd connections for a tracing session. First creates the socket to | |
995 | * the relayd and send them to the right domain consumer. Consumer type MUST be | |
996 | * network. | |
997 | */ | |
ffe60014 | 998 | int cmd_setup_relayd(struct ltt_session *session) |
2f77fc4b | 999 | { |
f73fabfd | 1000 | int ret = LTTNG_OK; |
2f77fc4b DG |
1001 | struct ltt_ust_session *usess; |
1002 | struct ltt_kernel_session *ksess; | |
1003 | struct consumer_socket *socket; | |
1004 | struct lttng_ht_iter iter; | |
1005 | ||
1006 | assert(session); | |
1007 | ||
1008 | usess = session->ust_session; | |
1009 | ksess = session->kernel_session; | |
1010 | ||
785d2d0d | 1011 | DBG("Setting relayd for session %s", session->name); |
2f77fc4b | 1012 | |
e7fe706f DG |
1013 | rcu_read_lock(); |
1014 | ||
2f77fc4b DG |
1015 | if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET |
1016 | && usess->consumer->enabled) { | |
1017 | /* For each consumer socket, send relayd sockets */ | |
1018 | cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, | |
1019 | socket, node.node) { | |
2f77fc4b | 1020 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1021 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id, |
d3e2ba59 JD |
1022 | usess->consumer, socket, |
1023 | session->name, session->hostname, | |
1024 | session->live_timer); | |
2f77fc4b | 1025 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1026 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1027 | goto error; |
1028 | } | |
6dc3064a DG |
1029 | /* Session is now ready for network streaming. */ |
1030 | session->net_handle = 1; | |
2f77fc4b | 1031 | } |
b31610f2 JD |
1032 | session->consumer->relay_major_version = |
1033 | usess->consumer->relay_major_version; | |
1034 | session->consumer->relay_minor_version = | |
1035 | usess->consumer->relay_minor_version; | |
2f77fc4b DG |
1036 | } |
1037 | ||
1038 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET | |
1039 | && ksess->consumer->enabled) { | |
1040 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1041 | socket, node.node) { | |
2f77fc4b | 1042 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1043 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id, |
d3e2ba59 JD |
1044 | ksess->consumer, socket, |
1045 | session->name, session->hostname, | |
1046 | session->live_timer); | |
2f77fc4b | 1047 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1048 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1049 | goto error; |
1050 | } | |
6dc3064a DG |
1051 | /* Session is now ready for network streaming. */ |
1052 | session->net_handle = 1; | |
2f77fc4b | 1053 | } |
b31610f2 JD |
1054 | session->consumer->relay_major_version = |
1055 | ksess->consumer->relay_major_version; | |
1056 | session->consumer->relay_minor_version = | |
1057 | ksess->consumer->relay_minor_version; | |
2f77fc4b DG |
1058 | } |
1059 | ||
1060 | error: | |
e7fe706f | 1061 | rcu_read_unlock(); |
2f77fc4b DG |
1062 | return ret; |
1063 | } | |
1064 | ||
9b6c7ec5 DG |
1065 | /* |
1066 | * Start a kernel session by opening all necessary streams. | |
1067 | */ | |
1068 | static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe) | |
1069 | { | |
1070 | int ret; | |
1071 | struct ltt_kernel_channel *kchan; | |
1072 | ||
1073 | /* Open kernel metadata */ | |
07b86b52 | 1074 | if (ksess->metadata == NULL && ksess->output_traces) { |
9b6c7ec5 DG |
1075 | ret = kernel_open_metadata(ksess); |
1076 | if (ret < 0) { | |
1077 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1078 | goto error; | |
1079 | } | |
1080 | } | |
1081 | ||
1082 | /* Open kernel metadata stream */ | |
07b86b52 | 1083 | if (ksess->metadata && ksess->metadata_stream_fd < 0) { |
9b6c7ec5 DG |
1084 | ret = kernel_open_metadata_stream(ksess); |
1085 | if (ret < 0) { | |
1086 | ERR("Kernel create metadata stream failed"); | |
1087 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1088 | goto error; | |
1089 | } | |
1090 | } | |
1091 | ||
1092 | /* For each channel */ | |
1093 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
1094 | if (kchan->stream_count == 0) { | |
1095 | ret = kernel_open_channel_stream(kchan); | |
1096 | if (ret < 0) { | |
1097 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1098 | goto error; | |
1099 | } | |
1100 | /* Update the stream global counter */ | |
1101 | ksess->stream_count_global += ret; | |
1102 | } | |
1103 | } | |
1104 | ||
1105 | /* Setup kernel consumer socket and send fds to it */ | |
1106 | ret = init_kernel_tracing(ksess); | |
e43c41c5 | 1107 | if (ret != 0) { |
9b6c7ec5 DG |
1108 | ret = LTTNG_ERR_KERN_START_FAIL; |
1109 | goto error; | |
1110 | } | |
1111 | ||
1112 | /* This start the kernel tracing */ | |
1113 | ret = kernel_start_session(ksess); | |
1114 | if (ret < 0) { | |
1115 | ret = LTTNG_ERR_KERN_START_FAIL; | |
1116 | goto error; | |
1117 | } | |
1118 | ||
1119 | /* Quiescent wait after starting trace */ | |
784303b0 | 1120 | kernel_wait_quiescent(kernel_tracer_fd); |
9b6c7ec5 | 1121 | |
14fb1ebe | 1122 | ksess->active = 1; |
9b6c7ec5 DG |
1123 | |
1124 | ret = LTTNG_OK; | |
1125 | ||
1126 | error: | |
1127 | return ret; | |
1128 | } | |
1129 | ||
2f77fc4b DG |
1130 | /* |
1131 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. | |
1132 | */ | |
56a37563 JG |
1133 | int cmd_disable_channel(struct ltt_session *session, |
1134 | enum lttng_domain_type domain, char *channel_name) | |
2f77fc4b DG |
1135 | { |
1136 | int ret; | |
1137 | struct ltt_ust_session *usess; | |
1138 | ||
1139 | usess = session->ust_session; | |
1140 | ||
2223c96f DG |
1141 | rcu_read_lock(); |
1142 | ||
2f77fc4b DG |
1143 | switch (domain) { |
1144 | case LTTNG_DOMAIN_KERNEL: | |
1145 | { | |
1146 | ret = channel_kernel_disable(session->kernel_session, | |
1147 | channel_name); | |
f73fabfd | 1148 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1149 | goto error; |
1150 | } | |
1151 | ||
1152 | kernel_wait_quiescent(kernel_tracer_fd); | |
1153 | break; | |
1154 | } | |
1155 | case LTTNG_DOMAIN_UST: | |
1156 | { | |
1157 | struct ltt_ust_channel *uchan; | |
1158 | struct lttng_ht *chan_ht; | |
1159 | ||
1160 | chan_ht = usess->domain_global.channels; | |
1161 | ||
1162 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
1163 | if (uchan == NULL) { | |
f73fabfd | 1164 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
1165 | goto error; |
1166 | } | |
1167 | ||
7972aab2 | 1168 | ret = channel_ust_disable(usess, uchan); |
f73fabfd | 1169 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1170 | goto error; |
1171 | } | |
1172 | break; | |
1173 | } | |
2f77fc4b | 1174 | default: |
f73fabfd | 1175 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1176 | goto error; |
1177 | } | |
1178 | ||
f73fabfd | 1179 | ret = LTTNG_OK; |
2f77fc4b DG |
1180 | |
1181 | error: | |
2223c96f | 1182 | rcu_read_unlock(); |
2f77fc4b DG |
1183 | return ret; |
1184 | } | |
1185 | ||
ccf10263 MD |
1186 | /* |
1187 | * Command LTTNG_TRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1188 | * |
1189 | * Called with session lock held. | |
ccf10263 | 1190 | */ |
56a37563 JG |
1191 | int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1192 | int pid) | |
ccf10263 MD |
1193 | { |
1194 | int ret; | |
1195 | ||
1196 | rcu_read_lock(); | |
1197 | ||
1198 | switch (domain) { | |
1199 | case LTTNG_DOMAIN_KERNEL: | |
1200 | { | |
1201 | struct ltt_kernel_session *ksess; | |
1202 | ||
1203 | ksess = session->kernel_session; | |
1204 | ||
1205 | ret = kernel_track_pid(ksess, pid); | |
1206 | if (ret != LTTNG_OK) { | |
1207 | goto error; | |
1208 | } | |
1209 | ||
1210 | kernel_wait_quiescent(kernel_tracer_fd); | |
1211 | break; | |
1212 | } | |
ccf10263 | 1213 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1214 | { |
1215 | struct ltt_ust_session *usess; | |
1216 | ||
1217 | usess = session->ust_session; | |
1218 | ||
1219 | ret = trace_ust_track_pid(usess, pid); | |
1220 | if (ret != LTTNG_OK) { | |
1221 | goto error; | |
1222 | } | |
1223 | break; | |
1224 | } | |
ccf10263 MD |
1225 | default: |
1226 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1227 | goto error; | |
1228 | } | |
1229 | ||
1230 | ret = LTTNG_OK; | |
1231 | ||
1232 | error: | |
1233 | rcu_read_unlock(); | |
1234 | return ret; | |
1235 | } | |
1236 | ||
1237 | /* | |
1238 | * Command LTTNG_UNTRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1239 | * |
1240 | * Called with session lock held. | |
ccf10263 | 1241 | */ |
56a37563 JG |
1242 | int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1243 | int pid) | |
ccf10263 MD |
1244 | { |
1245 | int ret; | |
1246 | ||
1247 | rcu_read_lock(); | |
1248 | ||
1249 | switch (domain) { | |
1250 | case LTTNG_DOMAIN_KERNEL: | |
1251 | { | |
1252 | struct ltt_kernel_session *ksess; | |
1253 | ||
1254 | ksess = session->kernel_session; | |
1255 | ||
1256 | ret = kernel_untrack_pid(ksess, pid); | |
1257 | if (ret != LTTNG_OK) { | |
1258 | goto error; | |
1259 | } | |
1260 | ||
1261 | kernel_wait_quiescent(kernel_tracer_fd); | |
1262 | break; | |
1263 | } | |
ccf10263 | 1264 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1265 | { |
1266 | struct ltt_ust_session *usess; | |
1267 | ||
1268 | usess = session->ust_session; | |
1269 | ||
1270 | ret = trace_ust_untrack_pid(usess, pid); | |
1271 | if (ret != LTTNG_OK) { | |
1272 | goto error; | |
1273 | } | |
1274 | break; | |
1275 | } | |
ccf10263 MD |
1276 | default: |
1277 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1278 | goto error; | |
1279 | } | |
1280 | ||
1281 | ret = LTTNG_OK; | |
1282 | ||
1283 | error: | |
1284 | rcu_read_unlock(); | |
1285 | return ret; | |
1286 | } | |
1287 | ||
2f77fc4b DG |
1288 | /* |
1289 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
1290 | * | |
1291 | * The wpipe arguments is used as a notifier for the kernel thread. | |
1292 | */ | |
1293 | int cmd_enable_channel(struct ltt_session *session, | |
7972aab2 | 1294 | struct lttng_domain *domain, struct lttng_channel *attr, int wpipe) |
2f77fc4b DG |
1295 | { |
1296 | int ret; | |
1297 | struct ltt_ust_session *usess = session->ust_session; | |
1298 | struct lttng_ht *chan_ht; | |
1f345e94 | 1299 | size_t len; |
2f77fc4b DG |
1300 | |
1301 | assert(session); | |
1302 | assert(attr); | |
7972aab2 | 1303 | assert(domain); |
2f77fc4b | 1304 | |
f5436bfc | 1305 | len = lttng_strnlen(attr->name, sizeof(attr->name)); |
1f345e94 PP |
1306 | |
1307 | /* Validate channel name */ | |
1308 | if (attr->name[0] == '.' || | |
1309 | memchr(attr->name, '/', len) != NULL) { | |
1310 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1311 | goto end; | |
1312 | } | |
1313 | ||
2f77fc4b DG |
1314 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
1315 | ||
03b4fdcf DG |
1316 | rcu_read_lock(); |
1317 | ||
ecc48a90 JD |
1318 | /* |
1319 | * Don't try to enable a channel if the session has been started at | |
1320 | * some point in time before. The tracer does not allow it. | |
1321 | */ | |
8382cf6f | 1322 | if (session->has_been_started) { |
ecc48a90 JD |
1323 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
1324 | goto error; | |
1325 | } | |
1326 | ||
1327 | /* | |
1328 | * If the session is a live session, remove the switch timer, the | |
1329 | * live timer does the same thing but sends also synchronisation | |
1330 | * beacons for inactive streams. | |
1331 | */ | |
1332 | if (session->live_timer > 0) { | |
1333 | attr->attr.live_timer_interval = session->live_timer; | |
1334 | attr->attr.switch_timer_interval = 0; | |
1335 | } | |
1336 | ||
7972aab2 | 1337 | switch (domain->type) { |
2f77fc4b DG |
1338 | case LTTNG_DOMAIN_KERNEL: |
1339 | { | |
1340 | struct ltt_kernel_channel *kchan; | |
1341 | ||
2f77fc4b DG |
1342 | kchan = trace_kernel_get_channel_by_name(attr->name, |
1343 | session->kernel_session); | |
1344 | if (kchan == NULL) { | |
1345 | ret = channel_kernel_create(session->kernel_session, attr, wpipe); | |
85076754 MD |
1346 | if (attr->name[0] != '\0') { |
1347 | session->kernel_session->has_non_default_channel = 1; | |
1348 | } | |
2f77fc4b DG |
1349 | } else { |
1350 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
1351 | } | |
1352 | ||
f73fabfd | 1353 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1354 | goto error; |
1355 | } | |
1356 | ||
784303b0 | 1357 | kernel_wait_quiescent(kernel_tracer_fd); |
2f77fc4b DG |
1358 | break; |
1359 | } | |
1360 | case LTTNG_DOMAIN_UST: | |
9232818f JG |
1361 | case LTTNG_DOMAIN_JUL: |
1362 | case LTTNG_DOMAIN_LOG4J: | |
1363 | case LTTNG_DOMAIN_PYTHON: | |
2f77fc4b DG |
1364 | { |
1365 | struct ltt_ust_channel *uchan; | |
1366 | ||
9232818f JG |
1367 | /* |
1368 | * FIXME | |
1369 | * | |
1370 | * Current agent implementation limitations force us to allow | |
1371 | * only one channel at once in "agent" subdomains. Each | |
1372 | * subdomain has a default channel name which must be strictly | |
1373 | * adhered to. | |
1374 | */ | |
1375 | if (domain->type == LTTNG_DOMAIN_JUL) { | |
1376 | if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME, | |
1377 | LTTNG_SYMBOL_NAME_LEN)) { | |
1378 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1379 | goto error; | |
1380 | } | |
1381 | } else if (domain->type == LTTNG_DOMAIN_LOG4J) { | |
1382 | if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME, | |
1383 | LTTNG_SYMBOL_NAME_LEN)) { | |
1384 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1385 | goto error; | |
1386 | } | |
1387 | } else if (domain->type == LTTNG_DOMAIN_PYTHON) { | |
1388 | if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME, | |
1389 | LTTNG_SYMBOL_NAME_LEN)) { | |
1390 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1391 | goto error; | |
1392 | } | |
1393 | } | |
1394 | ||
2f77fc4b DG |
1395 | chan_ht = usess->domain_global.channels; |
1396 | ||
1397 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); | |
1398 | if (uchan == NULL) { | |
7972aab2 | 1399 | ret = channel_ust_create(usess, attr, domain->buf_type); |
85076754 MD |
1400 | if (attr->name[0] != '\0') { |
1401 | usess->has_non_default_channel = 1; | |
1402 | } | |
2f77fc4b | 1403 | } else { |
7972aab2 | 1404 | ret = channel_ust_enable(usess, uchan); |
2f77fc4b DG |
1405 | } |
1406 | break; | |
1407 | } | |
2f77fc4b | 1408 | default: |
f73fabfd | 1409 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1410 | goto error; |
1411 | } | |
1412 | ||
1413 | error: | |
2223c96f | 1414 | rcu_read_unlock(); |
1f345e94 | 1415 | end: |
2f77fc4b DG |
1416 | return ret; |
1417 | } | |
1418 | ||
2f77fc4b DG |
1419 | /* |
1420 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1421 | */ | |
56a37563 JG |
1422 | int cmd_disable_event(struct ltt_session *session, |
1423 | enum lttng_domain_type domain, char *channel_name, | |
6e911cad | 1424 | struct lttng_event *event) |
2f77fc4b DG |
1425 | { |
1426 | int ret; | |
6e911cad MD |
1427 | char *event_name; |
1428 | ||
18a720cd MD |
1429 | DBG("Disable event command for event \'%s\'", event->name); |
1430 | ||
6e911cad | 1431 | event_name = event->name; |
7076b56e JG |
1432 | if (validate_event_name(event_name)) { |
1433 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1434 | goto error; | |
1435 | } | |
6e911cad | 1436 | |
9b7431cf JG |
1437 | /* Error out on unhandled search criteria */ |
1438 | if (event->loglevel_type || event->loglevel != -1 || event->enabled | |
6e911cad | 1439 | || event->pid || event->filter || event->exclusion) { |
7076b56e JG |
1440 | ret = LTTNG_ERR_UNK; |
1441 | goto error; | |
6e911cad | 1442 | } |
2f77fc4b | 1443 | |
2223c96f DG |
1444 | rcu_read_lock(); |
1445 | ||
2f77fc4b DG |
1446 | switch (domain) { |
1447 | case LTTNG_DOMAIN_KERNEL: | |
1448 | { | |
1449 | struct ltt_kernel_channel *kchan; | |
1450 | struct ltt_kernel_session *ksess; | |
1451 | ||
1452 | ksess = session->kernel_session; | |
1453 | ||
85076754 MD |
1454 | /* |
1455 | * If a non-default channel has been created in the | |
1456 | * session, explicitely require that -c chan_name needs | |
1457 | * to be provided. | |
1458 | */ | |
1459 | if (ksess->has_non_default_channel && channel_name[0] == '\0') { | |
1460 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1461 | goto error_unlock; |
85076754 MD |
1462 | } |
1463 | ||
2f77fc4b DG |
1464 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
1465 | if (kchan == NULL) { | |
f73fabfd | 1466 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
7076b56e | 1467 | goto error_unlock; |
2f77fc4b DG |
1468 | } |
1469 | ||
6e911cad MD |
1470 | switch (event->type) { |
1471 | case LTTNG_EVENT_ALL: | |
9550ee81 | 1472 | case LTTNG_EVENT_TRACEPOINT: |
d0ae4ea8 | 1473 | case LTTNG_EVENT_SYSCALL: |
9550ee81 JR |
1474 | case LTTNG_EVENT_PROBE: |
1475 | case LTTNG_EVENT_FUNCTION: | |
1476 | case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */ | |
1477 | if (event_name[0] == '\0') { | |
1478 | ret = event_kernel_disable_event(kchan, | |
1479 | NULL, event->type); | |
29c62722 | 1480 | } else { |
d0ae4ea8 | 1481 | ret = event_kernel_disable_event(kchan, |
9550ee81 | 1482 | event_name, event->type); |
29c62722 | 1483 | } |
6e911cad | 1484 | if (ret != LTTNG_OK) { |
7076b56e | 1485 | goto error_unlock; |
6e911cad MD |
1486 | } |
1487 | break; | |
6e911cad MD |
1488 | default: |
1489 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1490 | goto error_unlock; |
2f77fc4b DG |
1491 | } |
1492 | ||
1493 | kernel_wait_quiescent(kernel_tracer_fd); | |
1494 | break; | |
1495 | } | |
1496 | case LTTNG_DOMAIN_UST: | |
1497 | { | |
1498 | struct ltt_ust_channel *uchan; | |
1499 | struct ltt_ust_session *usess; | |
1500 | ||
1501 | usess = session->ust_session; | |
1502 | ||
7076b56e JG |
1503 | if (validate_ust_event_name(event_name)) { |
1504 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1505 | goto error_unlock; | |
1506 | } | |
1507 | ||
85076754 MD |
1508 | /* |
1509 | * If a non-default channel has been created in the | |
9550ee81 | 1510 | * session, explicitly require that -c chan_name needs |
85076754 MD |
1511 | * to be provided. |
1512 | */ | |
1513 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1514 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1515 | goto error_unlock; |
85076754 MD |
1516 | } |
1517 | ||
2f77fc4b DG |
1518 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
1519 | channel_name); | |
1520 | if (uchan == NULL) { | |
f73fabfd | 1521 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
7076b56e | 1522 | goto error_unlock; |
2f77fc4b DG |
1523 | } |
1524 | ||
6e911cad MD |
1525 | switch (event->type) { |
1526 | case LTTNG_EVENT_ALL: | |
b3639870 JR |
1527 | /* |
1528 | * An empty event name means that everything | |
1529 | * should be disabled. | |
1530 | */ | |
1531 | if (event->name[0] == '\0') { | |
1532 | ret = event_ust_disable_all_tracepoints(usess, uchan); | |
77d536b2 JR |
1533 | } else { |
1534 | ret = event_ust_disable_tracepoint(usess, uchan, | |
1535 | event_name); | |
1536 | } | |
6e911cad | 1537 | if (ret != LTTNG_OK) { |
7076b56e | 1538 | goto error_unlock; |
6e911cad MD |
1539 | } |
1540 | break; | |
1541 | default: | |
1542 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1543 | goto error_unlock; |
2f77fc4b DG |
1544 | } |
1545 | ||
1546 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
1547 | channel_name); | |
1548 | break; | |
1549 | } | |
5cdb6027 | 1550 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1551 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1552 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1553 | { |
fefd409b | 1554 | struct agent *agt; |
f20baf8e DG |
1555 | struct ltt_ust_session *usess = session->ust_session; |
1556 | ||
1557 | assert(usess); | |
1558 | ||
6e911cad MD |
1559 | switch (event->type) { |
1560 | case LTTNG_EVENT_ALL: | |
1561 | break; | |
1562 | default: | |
1563 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1564 | goto error_unlock; |
6e911cad MD |
1565 | } |
1566 | ||
5cdb6027 | 1567 | agt = trace_ust_find_agent(usess, domain); |
fefd409b DG |
1568 | if (!agt) { |
1569 | ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
7076b56e | 1570 | goto error_unlock; |
fefd409b | 1571 | } |
b3639870 JR |
1572 | /* |
1573 | * An empty event name means that everything | |
1574 | * should be disabled. | |
1575 | */ | |
1576 | if (event->name[0] == '\0') { | |
18a720cd MD |
1577 | ret = event_agent_disable_all(usess, agt); |
1578 | } else { | |
1579 | ret = event_agent_disable(usess, agt, event_name); | |
1580 | } | |
f20baf8e | 1581 | if (ret != LTTNG_OK) { |
7076b56e | 1582 | goto error_unlock; |
f20baf8e DG |
1583 | } |
1584 | ||
1585 | break; | |
1586 | } | |
2f77fc4b | 1587 | default: |
f73fabfd | 1588 | ret = LTTNG_ERR_UND; |
7076b56e | 1589 | goto error_unlock; |
2f77fc4b DG |
1590 | } |
1591 | ||
f73fabfd | 1592 | ret = LTTNG_OK; |
2f77fc4b | 1593 | |
7076b56e | 1594 | error_unlock: |
2223c96f | 1595 | rcu_read_unlock(); |
7076b56e | 1596 | error: |
2f77fc4b DG |
1597 | return ret; |
1598 | } | |
1599 | ||
2f77fc4b DG |
1600 | /* |
1601 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1602 | */ | |
56a37563 | 1603 | int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain, |
601d5acf | 1604 | char *channel_name, struct lttng_event_context *ctx, int kwpipe) |
2f77fc4b | 1605 | { |
d5979e4a | 1606 | int ret, chan_kern_created = 0, chan_ust_created = 0; |
bdf64013 JG |
1607 | char *app_ctx_provider_name = NULL, *app_ctx_name = NULL; |
1608 | ||
1609 | if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
1610 | app_ctx_provider_name = ctx->u.app_ctx.provider_name; | |
1611 | app_ctx_name = ctx->u.app_ctx.ctx_name; | |
1612 | } | |
2f77fc4b DG |
1613 | |
1614 | switch (domain) { | |
1615 | case LTTNG_DOMAIN_KERNEL: | |
979e618e DG |
1616 | assert(session->kernel_session); |
1617 | ||
1618 | if (session->kernel_session->channel_count == 0) { | |
1619 | /* Create default channel */ | |
1620 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); | |
1621 | if (ret != LTTNG_OK) { | |
1622 | goto error; | |
1623 | } | |
d5979e4a | 1624 | chan_kern_created = 1; |
979e618e | 1625 | } |
2f77fc4b | 1626 | /* Add kernel context to kernel tracer */ |
601d5acf | 1627 | ret = context_kernel_add(session->kernel_session, ctx, channel_name); |
f73fabfd | 1628 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1629 | goto error; |
1630 | } | |
1631 | break; | |
bdf64013 JG |
1632 | case LTTNG_DOMAIN_JUL: |
1633 | case LTTNG_DOMAIN_LOG4J: | |
1634 | { | |
1635 | /* | |
1636 | * Validate channel name. | |
1637 | * If no channel name is given and the domain is JUL or LOG4J, | |
1638 | * set it to the appropriate domain-specific channel name. If | |
1639 | * a name is provided but does not match the expexted channel | |
1640 | * name, return an error. | |
1641 | */ | |
1642 | if (domain == LTTNG_DOMAIN_JUL && *channel_name && | |
1643 | strcmp(channel_name, | |
1644 | DEFAULT_JUL_CHANNEL_NAME)) { | |
1645 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1646 | goto error; | |
1647 | } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name && | |
1648 | strcmp(channel_name, | |
1649 | DEFAULT_LOG4J_CHANNEL_NAME)) { | |
1650 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1651 | goto error; | |
1652 | } | |
a93b3916 | 1653 | /* break is _not_ missing here. */ |
bdf64013 | 1654 | } |
2f77fc4b DG |
1655 | case LTTNG_DOMAIN_UST: |
1656 | { | |
1657 | struct ltt_ust_session *usess = session->ust_session; | |
85076754 MD |
1658 | unsigned int chan_count; |
1659 | ||
2f77fc4b DG |
1660 | assert(usess); |
1661 | ||
85076754 | 1662 | chan_count = lttng_ht_get_count(usess->domain_global.channels); |
979e618e DG |
1663 | if (chan_count == 0) { |
1664 | struct lttng_channel *attr; | |
1665 | /* Create default channel */ | |
0a9c6494 | 1666 | attr = channel_new_default_attr(domain, usess->buffer_type); |
979e618e DG |
1667 | if (attr == NULL) { |
1668 | ret = LTTNG_ERR_FATAL; | |
1669 | goto error; | |
1670 | } | |
1671 | ||
7972aab2 | 1672 | ret = channel_ust_create(usess, attr, usess->buffer_type); |
979e618e DG |
1673 | if (ret != LTTNG_OK) { |
1674 | free(attr); | |
1675 | goto error; | |
1676 | } | |
1677 | free(attr); | |
d5979e4a | 1678 | chan_ust_created = 1; |
979e618e DG |
1679 | } |
1680 | ||
601d5acf | 1681 | ret = context_ust_add(usess, domain, ctx, channel_name); |
bdf64013 JG |
1682 | free(app_ctx_provider_name); |
1683 | free(app_ctx_name); | |
1684 | app_ctx_name = NULL; | |
1685 | app_ctx_provider_name = NULL; | |
f73fabfd | 1686 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1687 | goto error; |
1688 | } | |
1689 | break; | |
1690 | } | |
2f77fc4b | 1691 | default: |
f73fabfd | 1692 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1693 | goto error; |
1694 | } | |
1695 | ||
bdf64013 JG |
1696 | ret = LTTNG_OK; |
1697 | goto end; | |
2f77fc4b DG |
1698 | |
1699 | error: | |
d5979e4a DG |
1700 | if (chan_kern_created) { |
1701 | struct ltt_kernel_channel *kchan = | |
1702 | trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME, | |
1703 | session->kernel_session); | |
1704 | /* Created previously, this should NOT fail. */ | |
1705 | assert(kchan); | |
1706 | kernel_destroy_channel(kchan); | |
1707 | } | |
1708 | ||
1709 | if (chan_ust_created) { | |
1710 | struct ltt_ust_channel *uchan = | |
1711 | trace_ust_find_channel_by_name( | |
1712 | session->ust_session->domain_global.channels, | |
1713 | DEFAULT_CHANNEL_NAME); | |
1714 | /* Created previously, this should NOT fail. */ | |
1715 | assert(uchan); | |
1716 | /* Remove from the channel list of the session. */ | |
1717 | trace_ust_delete_channel(session->ust_session->domain_global.channels, | |
1718 | uchan); | |
1719 | trace_ust_destroy_channel(uchan); | |
1720 | } | |
bdf64013 JG |
1721 | end: |
1722 | free(app_ctx_provider_name); | |
1723 | free(app_ctx_name); | |
2f77fc4b DG |
1724 | return ret; |
1725 | } | |
1726 | ||
930a2e99 JG |
1727 | static int validate_event_name(const char *name) |
1728 | { | |
1729 | int ret = 0; | |
1730 | const char *c = name; | |
1731 | const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN; | |
bf9807db | 1732 | bool null_terminated = false; |
930a2e99 JG |
1733 | |
1734 | /* | |
1735 | * Make sure that unescaped wildcards are only used as the last | |
1736 | * character of the event name. | |
1737 | */ | |
1738 | while (c < event_name_end) { | |
1739 | switch (*c) { | |
1740 | case '\0': | |
bf9807db | 1741 | null_terminated = true; |
930a2e99 JG |
1742 | goto end; |
1743 | case '\\': | |
1744 | c++; | |
1745 | break; | |
1746 | case '*': | |
1747 | if ((c + 1) < event_name_end && *(c + 1)) { | |
1748 | /* Wildcard is not the last character */ | |
1749 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1750 | goto end; | |
1751 | } | |
1752 | default: | |
1753 | break; | |
1754 | } | |
1755 | c++; | |
1756 | } | |
1757 | end: | |
bf9807db JG |
1758 | if (!ret && !null_terminated) { |
1759 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1760 | } | |
930a2e99 JG |
1761 | return ret; |
1762 | } | |
1763 | ||
dac8e046 JG |
1764 | static inline bool name_starts_with(const char *name, const char *prefix) |
1765 | { | |
1766 | const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN); | |
1767 | ||
1768 | return !strncmp(name, prefix, max_cmp_len); | |
1769 | } | |
1770 | ||
1771 | /* Perform userspace-specific event name validation */ | |
1772 | static int validate_ust_event_name(const char *name) | |
1773 | { | |
1774 | int ret = 0; | |
1775 | ||
1776 | if (!name) { | |
1777 | ret = -1; | |
1778 | goto end; | |
1779 | } | |
1780 | ||
1781 | /* | |
1782 | * Check name against all internal UST event component namespaces used | |
1783 | * by the agents. | |
1784 | */ | |
1785 | if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) || | |
1786 | name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) || | |
1787 | name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) { | |
1788 | ret = -1; | |
1789 | } | |
1790 | ||
1791 | end: | |
1792 | return ret; | |
1793 | } | |
88f06f15 | 1794 | |
2f77fc4b | 1795 | /* |
88f06f15 JG |
1796 | * Internal version of cmd_enable_event() with a supplemental |
1797 | * "internal_event" flag which is used to enable internal events which should | |
1798 | * be hidden from clients. Such events are used in the agent implementation to | |
1799 | * enable the events through which all "agent" events are funeled. | |
2f77fc4b | 1800 | */ |
88f06f15 JG |
1801 | static int _cmd_enable_event(struct ltt_session *session, |
1802 | struct lttng_domain *domain, | |
025faf73 | 1803 | char *channel_name, struct lttng_event *event, |
6b453b5e | 1804 | char *filter_expression, |
db8f1377 JI |
1805 | struct lttng_filter_bytecode *filter, |
1806 | struct lttng_event_exclusion *exclusion, | |
88f06f15 | 1807 | int wpipe, bool internal_event) |
2f77fc4b | 1808 | { |
e5f5db7f | 1809 | int ret, channel_created = 0; |
cfedea03 | 1810 | struct lttng_channel *attr = NULL; |
2f77fc4b DG |
1811 | |
1812 | assert(session); | |
1813 | assert(event); | |
1814 | assert(channel_name); | |
1815 | ||
2a385866 JG |
1816 | /* If we have a filter, we must have its filter expression */ |
1817 | assert(!(!!filter_expression ^ !!filter)); | |
1818 | ||
18a720cd MD |
1819 | DBG("Enable event command for event \'%s\'", event->name); |
1820 | ||
f5ac4bd7 MD |
1821 | rcu_read_lock(); |
1822 | ||
930a2e99 JG |
1823 | ret = validate_event_name(event->name); |
1824 | if (ret) { | |
1825 | goto error; | |
1826 | } | |
1827 | ||
7972aab2 | 1828 | switch (domain->type) { |
2f77fc4b DG |
1829 | case LTTNG_DOMAIN_KERNEL: |
1830 | { | |
1831 | struct ltt_kernel_channel *kchan; | |
1832 | ||
85076754 MD |
1833 | /* |
1834 | * If a non-default channel has been created in the | |
1835 | * session, explicitely require that -c chan_name needs | |
1836 | * to be provided. | |
1837 | */ | |
1838 | if (session->kernel_session->has_non_default_channel | |
1839 | && channel_name[0] == '\0') { | |
1840 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1841 | goto error; | |
1842 | } | |
1843 | ||
2f77fc4b DG |
1844 | kchan = trace_kernel_get_channel_by_name(channel_name, |
1845 | session->kernel_session); | |
1846 | if (kchan == NULL) { | |
0a9c6494 DG |
1847 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
1848 | LTTNG_BUFFER_GLOBAL); | |
2f77fc4b | 1849 | if (attr == NULL) { |
f73fabfd | 1850 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1851 | goto error; |
1852 | } | |
04c17253 MD |
1853 | if (lttng_strncpy(attr->name, channel_name, |
1854 | sizeof(attr->name))) { | |
1855 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
1856 | goto error; |
1857 | } | |
2f77fc4b DG |
1858 | |
1859 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1860 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1861 | goto error; |
1862 | } | |
e5f5db7f | 1863 | channel_created = 1; |
2f77fc4b DG |
1864 | } |
1865 | ||
1866 | /* Get the newly created kernel channel pointer */ | |
1867 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1868 | session->kernel_session); | |
1869 | if (kchan == NULL) { | |
1870 | /* This sould not happen... */ | |
f73fabfd | 1871 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1872 | goto error; |
1873 | } | |
1874 | ||
6e911cad MD |
1875 | switch (event->type) { |
1876 | case LTTNG_EVENT_ALL: | |
29c62722 | 1877 | { |
00a62084 MD |
1878 | char *filter_expression_a = NULL; |
1879 | struct lttng_filter_bytecode *filter_a = NULL; | |
1880 | ||
1881 | /* | |
1882 | * We need to duplicate filter_expression and filter, | |
1883 | * because ownership is passed to first enable | |
1884 | * event. | |
1885 | */ | |
1886 | if (filter_expression) { | |
1887 | filter_expression_a = strdup(filter_expression); | |
1888 | if (!filter_expression_a) { | |
1889 | ret = LTTNG_ERR_FATAL; | |
1890 | goto error; | |
1891 | } | |
1892 | } | |
1893 | if (filter) { | |
1894 | filter_a = zmalloc(sizeof(*filter_a) + filter->len); | |
1895 | if (!filter_a) { | |
1896 | free(filter_expression_a); | |
1897 | ret = LTTNG_ERR_FATAL; | |
1898 | goto error; | |
1899 | } | |
1900 | memcpy(filter_a, filter, sizeof(*filter_a) + filter->len); | |
1901 | } | |
29c62722 | 1902 | event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */ |
00a62084 MD |
1903 | ret = event_kernel_enable_event(kchan, event, |
1904 | filter_expression, filter); | |
a969e101 MD |
1905 | /* We have passed ownership */ |
1906 | filter_expression = NULL; | |
1907 | filter = NULL; | |
29c62722 MD |
1908 | if (ret != LTTNG_OK) { |
1909 | if (channel_created) { | |
1910 | /* Let's not leak a useless channel. */ | |
1911 | kernel_destroy_channel(kchan); | |
1912 | } | |
00a62084 MD |
1913 | free(filter_expression_a); |
1914 | free(filter_a); | |
29c62722 MD |
1915 | goto error; |
1916 | } | |
1917 | event->type = LTTNG_EVENT_SYSCALL; /* Hack */ | |
00a62084 MD |
1918 | ret = event_kernel_enable_event(kchan, event, |
1919 | filter_expression_a, filter_a); | |
60d21fa2 AB |
1920 | /* We have passed ownership */ |
1921 | filter_expression_a = NULL; | |
1922 | filter_a = NULL; | |
29c62722 MD |
1923 | if (ret != LTTNG_OK) { |
1924 | goto error; | |
1925 | } | |
1926 | break; | |
1927 | } | |
6e6ef3d7 DG |
1928 | case LTTNG_EVENT_PROBE: |
1929 | case LTTNG_EVENT_FUNCTION: | |
1930 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
6e911cad | 1931 | case LTTNG_EVENT_TRACEPOINT: |
00a62084 MD |
1932 | ret = event_kernel_enable_event(kchan, event, |
1933 | filter_expression, filter); | |
a969e101 MD |
1934 | /* We have passed ownership */ |
1935 | filter_expression = NULL; | |
1936 | filter = NULL; | |
6e911cad MD |
1937 | if (ret != LTTNG_OK) { |
1938 | if (channel_created) { | |
1939 | /* Let's not leak a useless channel. */ | |
1940 | kernel_destroy_channel(kchan); | |
1941 | } | |
1942 | goto error; | |
e5f5db7f | 1943 | } |
6e911cad MD |
1944 | break; |
1945 | case LTTNG_EVENT_SYSCALL: | |
00a62084 MD |
1946 | ret = event_kernel_enable_event(kchan, event, |
1947 | filter_expression, filter); | |
a969e101 MD |
1948 | /* We have passed ownership */ |
1949 | filter_expression = NULL; | |
1950 | filter = NULL; | |
e2b957af MD |
1951 | if (ret != LTTNG_OK) { |
1952 | goto error; | |
1953 | } | |
6e911cad MD |
1954 | break; |
1955 | default: | |
1956 | ret = LTTNG_ERR_UNK; | |
2f77fc4b DG |
1957 | goto error; |
1958 | } | |
1959 | ||
1960 | kernel_wait_quiescent(kernel_tracer_fd); | |
1961 | break; | |
1962 | } | |
1963 | case LTTNG_DOMAIN_UST: | |
1964 | { | |
1965 | struct ltt_ust_channel *uchan; | |
1966 | struct ltt_ust_session *usess = session->ust_session; | |
1967 | ||
1968 | assert(usess); | |
1969 | ||
85076754 MD |
1970 | /* |
1971 | * If a non-default channel has been created in the | |
1972 | * session, explicitely require that -c chan_name needs | |
1973 | * to be provided. | |
1974 | */ | |
1975 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1976 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1977 | goto error; | |
1978 | } | |
1979 | ||
2f77fc4b DG |
1980 | /* Get channel from global UST domain */ |
1981 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
1982 | channel_name); | |
1983 | if (uchan == NULL) { | |
1984 | /* Create default channel */ | |
0a9c6494 DG |
1985 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
1986 | usess->buffer_type); | |
2f77fc4b | 1987 | if (attr == NULL) { |
f73fabfd | 1988 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1989 | goto error; |
1990 | } | |
04c17253 MD |
1991 | if (lttng_strncpy(attr->name, channel_name, |
1992 | sizeof(attr->name))) { | |
1993 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
1994 | goto error; |
1995 | } | |
2f77fc4b DG |
1996 | |
1997 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1998 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1999 | goto error; |
2000 | } | |
2f77fc4b DG |
2001 | |
2002 | /* Get the newly created channel reference back */ | |
2003 | uchan = trace_ust_find_channel_by_name( | |
2004 | usess->domain_global.channels, channel_name); | |
2005 | assert(uchan); | |
2006 | } | |
2007 | ||
141feb8c JG |
2008 | if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) { |
2009 | /* | |
2010 | * Don't allow users to add UST events to channels which | |
2011 | * are assigned to a userspace subdomain (JUL, Log4J, | |
2012 | * Python, etc.). | |
2013 | */ | |
2014 | ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN; | |
2015 | goto error; | |
2016 | } | |
2017 | ||
dac8e046 JG |
2018 | if (!internal_event) { |
2019 | /* | |
2020 | * Ensure the event name is not reserved for internal | |
2021 | * use. | |
2022 | */ | |
2023 | ret = validate_ust_event_name(event->name); | |
2024 | if (ret) { | |
2025 | WARN("Userspace event name %s failed validation.", | |
2026 | event->name ? | |
2027 | event->name : "NULL"); | |
2028 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
2029 | goto error; | |
2030 | } | |
2031 | } | |
2032 | ||
2f77fc4b | 2033 | /* At this point, the session and channel exist on the tracer */ |
6b453b5e | 2034 | ret = event_ust_enable_tracepoint(usess, uchan, event, |
88f06f15 JG |
2035 | filter_expression, filter, exclusion, |
2036 | internal_event); | |
49d21f93 MD |
2037 | /* We have passed ownership */ |
2038 | filter_expression = NULL; | |
2039 | filter = NULL; | |
2040 | exclusion = NULL; | |
94382e15 JG |
2041 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2042 | goto already_enabled; | |
2043 | } else if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2044 | goto error; |
2045 | } | |
2046 | break; | |
2047 | } | |
5cdb6027 | 2048 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 2049 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2050 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 2051 | { |
da6c3a50 | 2052 | const char *default_event_name, *default_chan_name; |
fefd409b | 2053 | struct agent *agt; |
f20baf8e DG |
2054 | struct lttng_event uevent; |
2055 | struct lttng_domain tmp_dom; | |
2056 | struct ltt_ust_session *usess = session->ust_session; | |
2057 | ||
2058 | assert(usess); | |
2059 | ||
5cdb6027 | 2060 | agt = trace_ust_find_agent(usess, domain->type); |
fefd409b | 2061 | if (!agt) { |
5cdb6027 | 2062 | agt = agent_create(domain->type); |
fefd409b | 2063 | if (!agt) { |
e5b3c48c | 2064 | ret = LTTNG_ERR_NOMEM; |
fefd409b DG |
2065 | goto error; |
2066 | } | |
2067 | agent_add(agt, usess->agents); | |
2068 | } | |
2069 | ||
022d91ba | 2070 | /* Create the default tracepoint. */ |
996de3c7 | 2071 | memset(&uevent, 0, sizeof(uevent)); |
f20baf8e DG |
2072 | uevent.type = LTTNG_EVENT_TRACEPOINT; |
2073 | uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
51755dc8 JG |
2074 | default_event_name = event_get_default_agent_ust_name( |
2075 | domain->type); | |
da6c3a50 | 2076 | if (!default_event_name) { |
e5b3c48c | 2077 | ret = LTTNG_ERR_FATAL; |
da6c3a50 | 2078 | goto error; |
f43f95a9 | 2079 | } |
da6c3a50 | 2080 | strncpy(uevent.name, default_event_name, sizeof(uevent.name)); |
f20baf8e DG |
2081 | uevent.name[sizeof(uevent.name) - 1] = '\0'; |
2082 | ||
2083 | /* | |
2084 | * The domain type is changed because we are about to enable the | |
2085 | * default channel and event for the JUL domain that are hardcoded. | |
2086 | * This happens in the UST domain. | |
2087 | */ | |
2088 | memcpy(&tmp_dom, domain, sizeof(tmp_dom)); | |
2089 | tmp_dom.type = LTTNG_DOMAIN_UST; | |
2090 | ||
0e115563 DG |
2091 | switch (domain->type) { |
2092 | case LTTNG_DOMAIN_LOG4J: | |
da6c3a50 | 2093 | default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME; |
0e115563 DG |
2094 | break; |
2095 | case LTTNG_DOMAIN_JUL: | |
da6c3a50 | 2096 | default_chan_name = DEFAULT_JUL_CHANNEL_NAME; |
0e115563 DG |
2097 | break; |
2098 | case LTTNG_DOMAIN_PYTHON: | |
2099 | default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
2100 | break; | |
2101 | default: | |
e98a44b0 | 2102 | /* The switch/case we are in makes this impossible */ |
0e115563 | 2103 | assert(0); |
da6c3a50 DG |
2104 | } |
2105 | ||
971da06a | 2106 | { |
8404118c | 2107 | char *filter_expression_copy = NULL; |
51755dc8 | 2108 | struct lttng_filter_bytecode *filter_copy = NULL; |
971da06a JG |
2109 | |
2110 | if (filter) { | |
51755dc8 JG |
2111 | const size_t filter_size = sizeof( |
2112 | struct lttng_filter_bytecode) | |
2113 | + filter->len; | |
2114 | ||
2115 | filter_copy = zmalloc(filter_size); | |
971da06a | 2116 | if (!filter_copy) { |
018096a4 | 2117 | ret = LTTNG_ERR_NOMEM; |
b742e3e2 | 2118 | goto error; |
971da06a | 2119 | } |
51755dc8 | 2120 | memcpy(filter_copy, filter, filter_size); |
971da06a | 2121 | |
8404118c JG |
2122 | filter_expression_copy = |
2123 | strdup(filter_expression); | |
2124 | if (!filter_expression) { | |
2125 | ret = LTTNG_ERR_NOMEM; | |
51755dc8 JG |
2126 | } |
2127 | ||
2128 | if (!filter_expression_copy || !filter_copy) { | |
2129 | free(filter_expression_copy); | |
2130 | free(filter_copy); | |
2131 | goto error; | |
8404118c | 2132 | } |
971da06a JG |
2133 | } |
2134 | ||
88f06f15 | 2135 | ret = cmd_enable_event_internal(session, &tmp_dom, |
971da06a | 2136 | (char *) default_chan_name, |
8404118c JG |
2137 | &uevent, filter_expression_copy, |
2138 | filter_copy, NULL, wpipe); | |
971da06a JG |
2139 | } |
2140 | ||
94382e15 JG |
2141 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2142 | goto already_enabled; | |
2143 | } else if (ret != LTTNG_OK) { | |
f20baf8e DG |
2144 | goto error; |
2145 | } | |
2146 | ||
2147 | /* The wild card * means that everything should be enabled. */ | |
2148 | if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) { | |
8404118c JG |
2149 | ret = event_agent_enable_all(usess, agt, event, filter, |
2150 | filter_expression); | |
f20baf8e | 2151 | } else { |
8404118c JG |
2152 | ret = event_agent_enable(usess, agt, event, filter, |
2153 | filter_expression); | |
f20baf8e | 2154 | } |
51755dc8 JG |
2155 | filter = NULL; |
2156 | filter_expression = NULL; | |
f20baf8e DG |
2157 | if (ret != LTTNG_OK) { |
2158 | goto error; | |
2159 | } | |
2160 | ||
2161 | break; | |
2162 | } | |
2f77fc4b | 2163 | default: |
f73fabfd | 2164 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2165 | goto error; |
2166 | } | |
2167 | ||
f73fabfd | 2168 | ret = LTTNG_OK; |
2f77fc4b | 2169 | |
94382e15 | 2170 | already_enabled: |
2f77fc4b | 2171 | error: |
49d21f93 MD |
2172 | free(filter_expression); |
2173 | free(filter); | |
2174 | free(exclusion); | |
cfedea03 | 2175 | free(attr); |
2223c96f | 2176 | rcu_read_unlock(); |
2f77fc4b DG |
2177 | return ret; |
2178 | } | |
2179 | ||
88f06f15 JG |
2180 | /* |
2181 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2182 | * We own filter, exclusion, and filter_expression. | |
2183 | */ | |
2184 | int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain, | |
2185 | char *channel_name, struct lttng_event *event, | |
2186 | char *filter_expression, | |
2187 | struct lttng_filter_bytecode *filter, | |
2188 | struct lttng_event_exclusion *exclusion, | |
2189 | int wpipe) | |
2190 | { | |
2191 | return _cmd_enable_event(session, domain, channel_name, event, | |
2192 | filter_expression, filter, exclusion, wpipe, false); | |
2193 | } | |
2194 | ||
2195 | /* | |
2196 | * Enable an event which is internal to LTTng. An internal should | |
2197 | * never be made visible to clients and are immune to checks such as | |
2198 | * reserved names. | |
2199 | */ | |
2200 | static int cmd_enable_event_internal(struct ltt_session *session, | |
2201 | struct lttng_domain *domain, | |
2202 | char *channel_name, struct lttng_event *event, | |
2203 | char *filter_expression, | |
2204 | struct lttng_filter_bytecode *filter, | |
2205 | struct lttng_event_exclusion *exclusion, | |
2206 | int wpipe) | |
2207 | { | |
2208 | return _cmd_enable_event(session, domain, channel_name, event, | |
2209 | filter_expression, filter, exclusion, wpipe, true); | |
2210 | } | |
2211 | ||
2f77fc4b DG |
2212 | /* |
2213 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2214 | */ | |
56a37563 JG |
2215 | ssize_t cmd_list_tracepoints(enum lttng_domain_type domain, |
2216 | struct lttng_event **events) | |
2f77fc4b DG |
2217 | { |
2218 | int ret; | |
2219 | ssize_t nb_events = 0; | |
2220 | ||
2221 | switch (domain) { | |
2222 | case LTTNG_DOMAIN_KERNEL: | |
2223 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2224 | if (nb_events < 0) { | |
f73fabfd | 2225 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
2f77fc4b DG |
2226 | goto error; |
2227 | } | |
2228 | break; | |
2229 | case LTTNG_DOMAIN_UST: | |
2230 | nb_events = ust_app_list_events(events); | |
2231 | if (nb_events < 0) { | |
f73fabfd | 2232 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2233 | goto error; |
2234 | } | |
2235 | break; | |
5cdb6027 | 2236 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2237 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2238 | case LTTNG_DOMAIN_PYTHON: |
f60140a1 | 2239 | nb_events = agent_list_events(events, domain); |
3c6a091f DG |
2240 | if (nb_events < 0) { |
2241 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2242 | goto error; | |
2243 | } | |
2244 | break; | |
2f77fc4b | 2245 | default: |
f73fabfd | 2246 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2247 | goto error; |
2248 | } | |
2249 | ||
2250 | return nb_events; | |
2251 | ||
2252 | error: | |
2253 | /* Return negative value to differentiate return code */ | |
2254 | return -ret; | |
2255 | } | |
2256 | ||
2257 | /* | |
2258 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
2259 | */ | |
56a37563 | 2260 | ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain, |
2f77fc4b DG |
2261 | struct lttng_event_field **fields) |
2262 | { | |
2263 | int ret; | |
2264 | ssize_t nb_fields = 0; | |
2265 | ||
2266 | switch (domain) { | |
2267 | case LTTNG_DOMAIN_UST: | |
2268 | nb_fields = ust_app_list_event_fields(fields); | |
2269 | if (nb_fields < 0) { | |
f73fabfd | 2270 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2271 | goto error; |
2272 | } | |
2273 | break; | |
2274 | case LTTNG_DOMAIN_KERNEL: | |
2275 | default: /* fall-through */ | |
f73fabfd | 2276 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2277 | goto error; |
2278 | } | |
2279 | ||
2280 | return nb_fields; | |
2281 | ||
2282 | error: | |
2283 | /* Return negative value to differentiate return code */ | |
2284 | return -ret; | |
2285 | } | |
2286 | ||
834978fd DG |
2287 | ssize_t cmd_list_syscalls(struct lttng_event **events) |
2288 | { | |
2289 | return syscall_table_list(events); | |
2290 | } | |
2291 | ||
a5dfbb9d MD |
2292 | /* |
2293 | * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread. | |
2294 | * | |
2295 | * Called with session lock held. | |
2296 | */ | |
2297 | ssize_t cmd_list_tracker_pids(struct ltt_session *session, | |
56a37563 | 2298 | enum lttng_domain_type domain, int32_t **pids) |
a5dfbb9d MD |
2299 | { |
2300 | int ret; | |
2301 | ssize_t nr_pids = 0; | |
2302 | ||
2303 | switch (domain) { | |
2304 | case LTTNG_DOMAIN_KERNEL: | |
2305 | { | |
2306 | struct ltt_kernel_session *ksess; | |
2307 | ||
2308 | ksess = session->kernel_session; | |
2309 | nr_pids = kernel_list_tracker_pids(ksess, pids); | |
2310 | if (nr_pids < 0) { | |
2311 | ret = LTTNG_ERR_KERN_LIST_FAIL; | |
2312 | goto error; | |
2313 | } | |
2314 | break; | |
2315 | } | |
2316 | case LTTNG_DOMAIN_UST: | |
2317 | { | |
2318 | struct ltt_ust_session *usess; | |
2319 | ||
2320 | usess = session->ust_session; | |
2321 | nr_pids = trace_ust_list_tracker_pids(usess, pids); | |
2322 | if (nr_pids < 0) { | |
2323 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2324 | goto error; | |
2325 | } | |
2326 | break; | |
2327 | } | |
2328 | case LTTNG_DOMAIN_LOG4J: | |
2329 | case LTTNG_DOMAIN_JUL: | |
2330 | case LTTNG_DOMAIN_PYTHON: | |
2331 | default: | |
2332 | ret = LTTNG_ERR_UND; | |
2333 | goto error; | |
2334 | } | |
2335 | ||
2336 | return nr_pids; | |
2337 | ||
2338 | error: | |
2339 | /* Return negative value to differentiate return code */ | |
2340 | return -ret; | |
2341 | } | |
2342 | ||
2f77fc4b DG |
2343 | /* |
2344 | * Command LTTNG_START_TRACE processed by the client thread. | |
a9ad0c8f MD |
2345 | * |
2346 | * Called with session mutex held. | |
2f77fc4b DG |
2347 | */ |
2348 | int cmd_start_trace(struct ltt_session *session) | |
2349 | { | |
2350 | int ret; | |
cde3e505 | 2351 | unsigned long nb_chan = 0; |
2f77fc4b DG |
2352 | struct ltt_kernel_session *ksession; |
2353 | struct ltt_ust_session *usess; | |
2f77fc4b DG |
2354 | |
2355 | assert(session); | |
2356 | ||
2357 | /* Ease our life a bit ;) */ | |
2358 | ksession = session->kernel_session; | |
2359 | usess = session->ust_session; | |
2360 | ||
8382cf6f DG |
2361 | /* Is the session already started? */ |
2362 | if (session->active) { | |
f73fabfd | 2363 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2364 | goto error; |
2365 | } | |
2366 | ||
cde3e505 DG |
2367 | /* |
2368 | * Starting a session without channel is useless since after that it's not | |
2369 | * possible to enable channel thus inform the client. | |
2370 | */ | |
2371 | if (usess && usess->domain_global.channels) { | |
2372 | nb_chan += lttng_ht_get_count(usess->domain_global.channels); | |
2373 | } | |
2374 | if (ksession) { | |
2375 | nb_chan += ksession->channel_count; | |
2376 | } | |
2377 | if (!nb_chan) { | |
2378 | ret = LTTNG_ERR_NO_CHANNEL; | |
2379 | goto error; | |
2380 | } | |
2381 | ||
2f77fc4b DG |
2382 | /* Kernel tracing */ |
2383 | if (ksession != NULL) { | |
9b6c7ec5 DG |
2384 | ret = start_kernel_session(ksession, kernel_tracer_fd); |
2385 | if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2386 | goto error; |
2387 | } | |
2f77fc4b DG |
2388 | } |
2389 | ||
2390 | /* Flag session that trace should start automatically */ | |
2391 | if (usess) { | |
14fb1ebe DG |
2392 | /* |
2393 | * Even though the start trace might fail, flag this session active so | |
2394 | * other application coming in are started by default. | |
2395 | */ | |
2396 | usess->active = 1; | |
2f77fc4b DG |
2397 | |
2398 | ret = ust_app_start_trace_all(usess); | |
2399 | if (ret < 0) { | |
f73fabfd | 2400 | ret = LTTNG_ERR_UST_START_FAIL; |
2f77fc4b DG |
2401 | goto error; |
2402 | } | |
2403 | } | |
2404 | ||
8382cf6f DG |
2405 | /* Flag this after a successful start. */ |
2406 | session->has_been_started = 1; | |
2407 | session->active = 1; | |
9b6c7ec5 | 2408 | |
f73fabfd | 2409 | ret = LTTNG_OK; |
2f77fc4b DG |
2410 | |
2411 | error: | |
2412 | return ret; | |
2413 | } | |
2414 | ||
2415 | /* | |
2416 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2417 | */ | |
2418 | int cmd_stop_trace(struct ltt_session *session) | |
2419 | { | |
2420 | int ret; | |
2421 | struct ltt_kernel_channel *kchan; | |
2422 | struct ltt_kernel_session *ksession; | |
2423 | struct ltt_ust_session *usess; | |
2424 | ||
2425 | assert(session); | |
2426 | ||
2427 | /* Short cut */ | |
2428 | ksession = session->kernel_session; | |
2429 | usess = session->ust_session; | |
2430 | ||
8382cf6f DG |
2431 | /* Session is not active. Skip everythong and inform the client. */ |
2432 | if (!session->active) { | |
f73fabfd | 2433 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
2f77fc4b DG |
2434 | goto error; |
2435 | } | |
2436 | ||
2f77fc4b | 2437 | /* Kernel tracer */ |
14fb1ebe | 2438 | if (ksession && ksession->active) { |
2f77fc4b DG |
2439 | DBG("Stop kernel tracing"); |
2440 | ||
566d8970 MD |
2441 | ret = kernel_stop_session(ksession); |
2442 | if (ret < 0) { | |
2443 | ret = LTTNG_ERR_KERN_STOP_FAIL; | |
2444 | goto error; | |
2445 | } | |
2446 | ||
2447 | kernel_wait_quiescent(kernel_tracer_fd); | |
2448 | ||
2449 | /* Flush metadata after stopping (if exists) */ | |
2f77fc4b DG |
2450 | if (ksession->metadata_stream_fd >= 0) { |
2451 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2452 | if (ret < 0) { | |
2453 | ERR("Kernel metadata flush failed"); | |
2454 | } | |
2455 | } | |
2456 | ||
566d8970 | 2457 | /* Flush all buffers after stopping */ |
2f77fc4b DG |
2458 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2459 | ret = kernel_flush_buffer(kchan); | |
2460 | if (ret < 0) { | |
2461 | ERR("Kernel flush buffer error"); | |
2462 | } | |
2463 | } | |
2464 | ||
14fb1ebe | 2465 | ksession->active = 0; |
2f77fc4b DG |
2466 | } |
2467 | ||
14fb1ebe DG |
2468 | if (usess && usess->active) { |
2469 | /* | |
2470 | * Even though the stop trace might fail, flag this session inactive so | |
2471 | * other application coming in are not started by default. | |
2472 | */ | |
2473 | usess->active = 0; | |
2f77fc4b DG |
2474 | |
2475 | ret = ust_app_stop_trace_all(usess); | |
2476 | if (ret < 0) { | |
f73fabfd | 2477 | ret = LTTNG_ERR_UST_STOP_FAIL; |
2f77fc4b DG |
2478 | goto error; |
2479 | } | |
2480 | } | |
2481 | ||
8382cf6f DG |
2482 | /* Flag inactive after a successful stop. */ |
2483 | session->active = 0; | |
f73fabfd | 2484 | ret = LTTNG_OK; |
2f77fc4b DG |
2485 | |
2486 | error: | |
2487 | return ret; | |
2488 | } | |
2489 | ||
2490 | /* | |
2491 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
2492 | */ | |
bda32d56 JG |
2493 | int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri, |
2494 | struct lttng_uri *uris) | |
2f77fc4b DG |
2495 | { |
2496 | int ret, i; | |
2497 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2498 | struct ltt_ust_session *usess = session->ust_session; | |
2f77fc4b DG |
2499 | |
2500 | assert(session); | |
2501 | assert(uris); | |
2502 | assert(nb_uri > 0); | |
2503 | ||
8382cf6f DG |
2504 | /* Can't set consumer URI if the session is active. */ |
2505 | if (session->active) { | |
f73fabfd | 2506 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2507 | goto error; |
2508 | } | |
2509 | ||
bda32d56 | 2510 | /* Set the "global" consumer URIs */ |
2f77fc4b | 2511 | for (i = 0; i < nb_uri; i++) { |
bda32d56 JG |
2512 | ret = add_uri_to_consumer(session->consumer, |
2513 | &uris[i], 0, session->name); | |
a74934ba | 2514 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2515 | goto error; |
2516 | } | |
2f77fc4b DG |
2517 | } |
2518 | ||
bda32d56 JG |
2519 | /* Set UST session URIs */ |
2520 | if (session->ust_session) { | |
2521 | for (i = 0; i < nb_uri; i++) { | |
2522 | ret = add_uri_to_consumer( | |
2523 | session->ust_session->consumer, | |
2524 | &uris[i], LTTNG_DOMAIN_UST, | |
2525 | session->name); | |
2526 | if (ret != LTTNG_OK) { | |
2527 | goto error; | |
2528 | } | |
2529 | } | |
2530 | } | |
2531 | ||
2532 | /* Set kernel session URIs */ | |
2533 | if (session->kernel_session) { | |
2534 | for (i = 0; i < nb_uri; i++) { | |
2535 | ret = add_uri_to_consumer( | |
2536 | session->kernel_session->consumer, | |
2537 | &uris[i], LTTNG_DOMAIN_KERNEL, | |
2538 | session->name); | |
2539 | if (ret != LTTNG_OK) { | |
2540 | goto error; | |
2541 | } | |
2542 | } | |
2543 | } | |
2544 | ||
7ab70fe0 DG |
2545 | /* |
2546 | * Make sure to set the session in output mode after we set URI since a | |
2547 | * session can be created without URL (thus flagged in no output mode). | |
2548 | */ | |
2549 | session->output_traces = 1; | |
2550 | if (ksess) { | |
2551 | ksess->output_traces = 1; | |
bda32d56 JG |
2552 | } |
2553 | ||
2554 | if (usess) { | |
7ab70fe0 DG |
2555 | usess->output_traces = 1; |
2556 | } | |
2557 | ||
2f77fc4b | 2558 | /* All good! */ |
f73fabfd | 2559 | ret = LTTNG_OK; |
2f77fc4b DG |
2560 | |
2561 | error: | |
2562 | return ret; | |
2563 | } | |
2564 | ||
2565 | /* | |
2566 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2567 | */ | |
2568 | int cmd_create_session_uri(char *name, struct lttng_uri *uris, | |
ecc48a90 | 2569 | size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer) |
2f77fc4b DG |
2570 | { |
2571 | int ret; | |
2f77fc4b DG |
2572 | struct ltt_session *session; |
2573 | ||
2574 | assert(name); | |
2bba9e53 | 2575 | assert(creds); |
785d2d0d | 2576 | |
2f77fc4b DG |
2577 | /* |
2578 | * Verify if the session already exist | |
2579 | * | |
2580 | * XXX: There is no need for the session lock list here since the caller | |
2581 | * (process_client_msg) is holding it. We might want to change that so a | |
2582 | * single command does not lock the entire session list. | |
2583 | */ | |
2584 | session = session_find_by_name(name); | |
2585 | if (session != NULL) { | |
f73fabfd | 2586 | ret = LTTNG_ERR_EXIST_SESS; |
2f77fc4b DG |
2587 | goto find_error; |
2588 | } | |
2589 | ||
2590 | /* Create tracing session in the registry */ | |
dec56f6c | 2591 | ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds), |
2f77fc4b | 2592 | LTTNG_SOCK_GET_GID_CRED(creds)); |
f73fabfd | 2593 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2594 | goto session_error; |
2595 | } | |
2596 | ||
2597 | /* | |
2598 | * Get the newly created session pointer back | |
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 | assert(session); | |
2606 | ||
ecc48a90 | 2607 | session->live_timer = live_timer; |
2f77fc4b DG |
2608 | /* Create default consumer output for the session not yet created. */ |
2609 | session->consumer = consumer_create_output(CONSUMER_DST_LOCAL); | |
2610 | if (session->consumer == NULL) { | |
f73fabfd | 2611 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2612 | goto consumer_error; |
2613 | } | |
2614 | ||
2bba9e53 | 2615 | if (uris) { |
bda32d56 | 2616 | ret = cmd_set_consumer_uri(session, nb_uri, uris); |
2bba9e53 DG |
2617 | if (ret != LTTNG_OK) { |
2618 | goto consumer_error; | |
2619 | } | |
2620 | session->output_traces = 1; | |
2621 | } else { | |
2622 | session->output_traces = 0; | |
2623 | DBG2("Session %s created with no output", session->name); | |
2f77fc4b DG |
2624 | } |
2625 | ||
2626 | session->consumer->enabled = 1; | |
2627 | ||
f73fabfd | 2628 | return LTTNG_OK; |
2f77fc4b DG |
2629 | |
2630 | consumer_error: | |
2631 | session_destroy(session); | |
2632 | session_error: | |
2633 | find_error: | |
2634 | return ret; | |
2635 | } | |
2636 | ||
27babd3a DG |
2637 | /* |
2638 | * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread. | |
2639 | */ | |
2640 | int cmd_create_session_snapshot(char *name, struct lttng_uri *uris, | |
2641 | size_t nb_uri, lttng_sock_cred *creds) | |
2642 | { | |
2643 | int ret; | |
2644 | struct ltt_session *session; | |
2645 | struct snapshot_output *new_output = NULL; | |
2646 | ||
2647 | assert(name); | |
2648 | assert(creds); | |
2649 | ||
2650 | /* | |
2651 | * Create session in no output mode with URIs set to NULL. The uris we've | |
2652 | * received are for a default snapshot output if one. | |
2653 | */ | |
ae58b817 | 2654 | ret = cmd_create_session_uri(name, NULL, 0, creds, 0); |
27babd3a DG |
2655 | if (ret != LTTNG_OK) { |
2656 | goto error; | |
2657 | } | |
2658 | ||
2659 | /* Get the newly created session pointer back. This should NEVER fail. */ | |
2660 | session = session_find_by_name(name); | |
2661 | assert(session); | |
2662 | ||
2663 | /* Flag session for snapshot mode. */ | |
2664 | session->snapshot_mode = 1; | |
2665 | ||
2666 | /* Skip snapshot output creation if no URI is given. */ | |
2667 | if (nb_uri == 0) { | |
2668 | goto end; | |
2669 | } | |
2670 | ||
2671 | new_output = snapshot_output_alloc(); | |
2672 | if (!new_output) { | |
2673 | ret = LTTNG_ERR_NOMEM; | |
2674 | goto error_snapshot_alloc; | |
2675 | } | |
2676 | ||
2677 | ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL, | |
2678 | uris, nb_uri, session->consumer, new_output, &session->snapshot); | |
2679 | if (ret < 0) { | |
2680 | if (ret == -ENOMEM) { | |
2681 | ret = LTTNG_ERR_NOMEM; | |
2682 | } else { | |
2683 | ret = LTTNG_ERR_INVALID; | |
2684 | } | |
2685 | goto error_snapshot; | |
2686 | } | |
2687 | ||
2688 | rcu_read_lock(); | |
2689 | snapshot_add_output(&session->snapshot, new_output); | |
2690 | rcu_read_unlock(); | |
2691 | ||
2692 | end: | |
2693 | return LTTNG_OK; | |
2694 | ||
2695 | error_snapshot: | |
2696 | snapshot_output_destroy(new_output); | |
2697 | error_snapshot_alloc: | |
2698 | session_destroy(session); | |
2699 | error: | |
2700 | return ret; | |
2701 | } | |
2702 | ||
2f77fc4b DG |
2703 | /* |
2704 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
a9ad0c8f MD |
2705 | * |
2706 | * Called with session lock held. | |
2f77fc4b DG |
2707 | */ |
2708 | int cmd_destroy_session(struct ltt_session *session, int wpipe) | |
2709 | { | |
2710 | int ret; | |
2711 | struct ltt_ust_session *usess; | |
2712 | struct ltt_kernel_session *ksess; | |
2713 | ||
2714 | /* Safety net */ | |
2715 | assert(session); | |
2716 | ||
2717 | usess = session->ust_session; | |
2718 | ksess = session->kernel_session; | |
2719 | ||
2720 | /* Clean kernel session teardown */ | |
2721 | kernel_destroy_session(ksess); | |
2722 | ||
2723 | /* UST session teardown */ | |
2724 | if (usess) { | |
2725 | /* Close any relayd session */ | |
2726 | consumer_output_send_destroy_relayd(usess->consumer); | |
2727 | ||
2728 | /* Destroy every UST application related to this session. */ | |
2729 | ret = ust_app_destroy_trace_all(usess); | |
2730 | if (ret) { | |
2731 | ERR("Error in ust_app_destroy_trace_all"); | |
2732 | } | |
2733 | ||
2734 | /* Clean up the rest. */ | |
2735 | trace_ust_destroy_session(usess); | |
2736 | } | |
2737 | ||
2738 | /* | |
2739 | * Must notify the kernel thread here to update it's poll set in order to | |
2740 | * remove the channel(s)' fd just destroyed. | |
2741 | */ | |
2742 | ret = notify_thread_pipe(wpipe); | |
2743 | if (ret < 0) { | |
2744 | PERROR("write kernel poll pipe"); | |
2745 | } | |
2746 | ||
2747 | ret = session_destroy(session); | |
2748 | ||
2749 | return ret; | |
2750 | } | |
2751 | ||
2f77fc4b DG |
2752 | /* |
2753 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
2754 | */ | |
56a37563 JG |
2755 | int cmd_register_consumer(struct ltt_session *session, |
2756 | enum lttng_domain_type domain, const char *sock_path, | |
2757 | struct consumer_data *cdata) | |
2f77fc4b DG |
2758 | { |
2759 | int ret, sock; | |
dd81b457 | 2760 | struct consumer_socket *socket = NULL; |
2f77fc4b DG |
2761 | |
2762 | assert(session); | |
2763 | assert(cdata); | |
2764 | assert(sock_path); | |
2765 | ||
2766 | switch (domain) { | |
2767 | case LTTNG_DOMAIN_KERNEL: | |
2768 | { | |
2769 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2770 | ||
2771 | assert(ksess); | |
2772 | ||
2773 | /* Can't register a consumer if there is already one */ | |
2774 | if (ksess->consumer_fds_sent != 0) { | |
f73fabfd | 2775 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
2776 | goto error; |
2777 | } | |
2778 | ||
2779 | sock = lttcomm_connect_unix_sock(sock_path); | |
2780 | if (sock < 0) { | |
f73fabfd | 2781 | ret = LTTNG_ERR_CONNECT_FAIL; |
2f77fc4b DG |
2782 | goto error; |
2783 | } | |
4ce514c4 | 2784 | cdata->cmd_sock = sock; |
2f77fc4b | 2785 | |
4ce514c4 | 2786 | socket = consumer_allocate_socket(&cdata->cmd_sock); |
2f77fc4b | 2787 | if (socket == NULL) { |
f66c074c DG |
2788 | ret = close(sock); |
2789 | if (ret < 0) { | |
2790 | PERROR("close register consumer"); | |
2791 | } | |
4ce514c4 | 2792 | cdata->cmd_sock = -1; |
f73fabfd | 2793 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2794 | goto error; |
2795 | } | |
2796 | ||
2797 | socket->lock = zmalloc(sizeof(pthread_mutex_t)); | |
2798 | if (socket->lock == NULL) { | |
2799 | PERROR("zmalloc pthread mutex"); | |
f73fabfd | 2800 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2801 | goto error; |
2802 | } | |
2803 | pthread_mutex_init(socket->lock, NULL); | |
2804 | socket->registered = 1; | |
2805 | ||
2806 | rcu_read_lock(); | |
2807 | consumer_add_socket(socket, ksess->consumer); | |
2808 | rcu_read_unlock(); | |
2809 | ||
2810 | pthread_mutex_lock(&cdata->pid_mutex); | |
2811 | cdata->pid = -1; | |
2812 | pthread_mutex_unlock(&cdata->pid_mutex); | |
2813 | ||
2814 | break; | |
2815 | } | |
2816 | default: | |
2817 | /* TODO: Userspace tracing */ | |
f73fabfd | 2818 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2819 | goto error; |
2820 | } | |
2821 | ||
dd81b457 | 2822 | return LTTNG_OK; |
2f77fc4b DG |
2823 | |
2824 | error: | |
dd81b457 DG |
2825 | if (socket) { |
2826 | consumer_destroy_socket(socket); | |
2827 | } | |
2f77fc4b DG |
2828 | return ret; |
2829 | } | |
2830 | ||
2831 | /* | |
2832 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
2833 | */ | |
2834 | ssize_t cmd_list_domains(struct ltt_session *session, | |
2835 | struct lttng_domain **domains) | |
2836 | { | |
2837 | int ret, index = 0; | |
2838 | ssize_t nb_dom = 0; | |
fefd409b DG |
2839 | struct agent *agt; |
2840 | struct lttng_ht_iter iter; | |
2f77fc4b DG |
2841 | |
2842 | if (session->kernel_session != NULL) { | |
2843 | DBG3("Listing domains found kernel domain"); | |
2844 | nb_dom++; | |
2845 | } | |
2846 | ||
2847 | if (session->ust_session != NULL) { | |
2848 | DBG3("Listing domains found UST global domain"); | |
2849 | nb_dom++; | |
3c6a091f | 2850 | |
e0a74f01 | 2851 | rcu_read_lock(); |
fefd409b DG |
2852 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2853 | agt, node.node) { | |
2854 | if (agt->being_used) { | |
2855 | nb_dom++; | |
2856 | } | |
3c6a091f | 2857 | } |
e0a74f01 | 2858 | rcu_read_unlock(); |
2f77fc4b DG |
2859 | } |
2860 | ||
fa64dfb4 JG |
2861 | if (!nb_dom) { |
2862 | goto end; | |
2863 | } | |
2864 | ||
2f77fc4b DG |
2865 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
2866 | if (*domains == NULL) { | |
f73fabfd | 2867 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2868 | goto error; |
2869 | } | |
2870 | ||
2871 | if (session->kernel_session != NULL) { | |
2872 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
b5edb9e8 PP |
2873 | |
2874 | /* Kernel session buffer type is always GLOBAL */ | |
2875 | (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL; | |
2876 | ||
2f77fc4b DG |
2877 | index++; |
2878 | } | |
2879 | ||
2880 | if (session->ust_session != NULL) { | |
2881 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
88c5f0d8 | 2882 | (*domains)[index].buf_type = session->ust_session->buffer_type; |
2f77fc4b | 2883 | index++; |
3c6a091f | 2884 | |
e0a74f01 | 2885 | rcu_read_lock(); |
fefd409b DG |
2886 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2887 | agt, node.node) { | |
2888 | if (agt->being_used) { | |
2889 | (*domains)[index].type = agt->domain; | |
2890 | (*domains)[index].buf_type = session->ust_session->buffer_type; | |
2891 | index++; | |
2892 | } | |
3c6a091f | 2893 | } |
e0a74f01 | 2894 | rcu_read_unlock(); |
2f77fc4b | 2895 | } |
fa64dfb4 | 2896 | end: |
2f77fc4b DG |
2897 | return nb_dom; |
2898 | ||
2899 | error: | |
f73fabfd DG |
2900 | /* Return negative value to differentiate return code */ |
2901 | return -ret; | |
2f77fc4b DG |
2902 | } |
2903 | ||
2904 | ||
2905 | /* | |
2906 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
2907 | */ | |
56a37563 JG |
2908 | ssize_t cmd_list_channels(enum lttng_domain_type domain, |
2909 | struct ltt_session *session, struct lttng_channel **channels) | |
2f77fc4b | 2910 | { |
53e367f9 | 2911 | ssize_t nb_chan = 0, payload_size = 0, ret; |
2f77fc4b DG |
2912 | |
2913 | switch (domain) { | |
2914 | case LTTNG_DOMAIN_KERNEL: | |
2915 | if (session->kernel_session != NULL) { | |
2916 | nb_chan = session->kernel_session->channel_count; | |
2917 | } | |
2918 | DBG3("Number of kernel channels %zd", nb_chan); | |
c7d620a2 | 2919 | if (nb_chan <= 0) { |
53e367f9 JG |
2920 | ret = -LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2921 | goto end; | |
c7d620a2 | 2922 | } |
2f77fc4b DG |
2923 | break; |
2924 | case LTTNG_DOMAIN_UST: | |
2925 | if (session->ust_session != NULL) { | |
7ffc31a2 | 2926 | rcu_read_lock(); |
2f77fc4b | 2927 | nb_chan = lttng_ht_get_count( |
7ffc31a2 JG |
2928 | session->ust_session->domain_global.channels); |
2929 | rcu_read_unlock(); | |
2f77fc4b DG |
2930 | } |
2931 | DBG3("Number of UST global channels %zd", nb_chan); | |
ade7ce52 | 2932 | if (nb_chan < 0) { |
53e367f9 JG |
2933 | ret = -LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2934 | goto end; | |
c7d620a2 | 2935 | } |
2f77fc4b DG |
2936 | break; |
2937 | default: | |
53e367f9 JG |
2938 | ret = -LTTNG_ERR_UND; |
2939 | goto end; | |
2f77fc4b DG |
2940 | } |
2941 | ||
2942 | if (nb_chan > 0) { | |
53e367f9 JG |
2943 | const size_t channel_size = sizeof(struct lttng_channel) + |
2944 | sizeof(struct lttcomm_channel_extended); | |
2945 | struct lttcomm_channel_extended *channel_exts; | |
2946 | ||
2947 | payload_size = nb_chan * channel_size; | |
2948 | *channels = zmalloc(payload_size); | |
2f77fc4b | 2949 | if (*channels == NULL) { |
53e367f9 JG |
2950 | ret = -LTTNG_ERR_FATAL; |
2951 | goto end; | |
2f77fc4b DG |
2952 | } |
2953 | ||
53e367f9 JG |
2954 | channel_exts = ((void *) *channels) + |
2955 | (nb_chan * sizeof(struct lttng_channel)); | |
2956 | list_lttng_channels(domain, session, *channels, channel_exts); | |
2957 | } else { | |
2958 | *channels = NULL; | |
2f77fc4b DG |
2959 | } |
2960 | ||
53e367f9 JG |
2961 | ret = payload_size; |
2962 | end: | |
2963 | return ret; | |
2f77fc4b DG |
2964 | } |
2965 | ||
2966 | /* | |
2967 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
2968 | */ | |
56a37563 JG |
2969 | ssize_t cmd_list_events(enum lttng_domain_type domain, |
2970 | struct ltt_session *session, char *channel_name, | |
b4e3ceb9 | 2971 | struct lttng_event **events, size_t *total_size) |
2f77fc4b DG |
2972 | { |
2973 | int ret = 0; | |
2974 | ssize_t nb_event = 0; | |
2975 | ||
2976 | switch (domain) { | |
2977 | case LTTNG_DOMAIN_KERNEL: | |
2978 | if (session->kernel_session != NULL) { | |
2979 | nb_event = list_lttng_kernel_events(channel_name, | |
b4e3ceb9 PP |
2980 | session->kernel_session, events, |
2981 | total_size); | |
2f77fc4b DG |
2982 | } |
2983 | break; | |
2984 | case LTTNG_DOMAIN_UST: | |
2985 | { | |
2986 | if (session->ust_session != NULL) { | |
2987 | nb_event = list_lttng_ust_global_events(channel_name, | |
b4e3ceb9 PP |
2988 | &session->ust_session->domain_global, events, |
2989 | total_size); | |
2f77fc4b DG |
2990 | } |
2991 | break; | |
2992 | } | |
5cdb6027 | 2993 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2994 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2995 | case LTTNG_DOMAIN_PYTHON: |
3c6a091f | 2996 | if (session->ust_session) { |
fefd409b DG |
2997 | struct lttng_ht_iter iter; |
2998 | struct agent *agt; | |
2999 | ||
b11feea5 | 3000 | rcu_read_lock(); |
fefd409b DG |
3001 | cds_lfht_for_each_entry(session->ust_session->agents->ht, |
3002 | &iter.iter, agt, node.node) { | |
1dfd9906 JG |
3003 | if (agt->domain == domain) { |
3004 | nb_event = list_lttng_agent_events( | |
b4e3ceb9 PP |
3005 | agt, events, |
3006 | total_size); | |
1dfd9906 JG |
3007 | break; |
3008 | } | |
fefd409b | 3009 | } |
b11feea5 | 3010 | rcu_read_unlock(); |
3c6a091f DG |
3011 | } |
3012 | break; | |
2f77fc4b | 3013 | default: |
f73fabfd | 3014 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3015 | goto error; |
3016 | } | |
3017 | ||
f73fabfd | 3018 | return nb_event; |
2f77fc4b DG |
3019 | |
3020 | error: | |
f73fabfd DG |
3021 | /* Return negative value to differentiate return code */ |
3022 | return -ret; | |
2f77fc4b DG |
3023 | } |
3024 | ||
3025 | /* | |
3026 | * Using the session list, filled a lttng_session array to send back to the | |
3027 | * client for session listing. | |
3028 | * | |
3029 | * The session list lock MUST be acquired before calling this function. Use | |
3030 | * session_lock_list() and session_unlock_list(). | |
3031 | */ | |
3032 | void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid, | |
3033 | gid_t gid) | |
3034 | { | |
3035 | int ret; | |
3036 | unsigned int i = 0; | |
3037 | struct ltt_session *session; | |
3038 | struct ltt_session_list *list = session_get_list(); | |
3039 | ||
3040 | DBG("Getting all available session for UID %d GID %d", | |
3041 | uid, gid); | |
3042 | /* | |
3043 | * Iterate over session list and append data after the control struct in | |
3044 | * the buffer. | |
3045 | */ | |
3046 | cds_list_for_each_entry(session, &list->head, list) { | |
3047 | /* | |
3048 | * Only list the sessions the user can control. | |
3049 | */ | |
3050 | if (!session_access_ok(session, uid, gid)) { | |
3051 | continue; | |
3052 | } | |
3053 | ||
3054 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3055 | struct ltt_ust_session *usess = session->ust_session; | |
3056 | ||
3057 | if (session->consumer->type == CONSUMER_DST_NET || | |
3058 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
3059 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
3060 | ret = build_network_session_path(sessions[i].path, | |
dec56f6c | 3061 | sizeof(sessions[i].path), session); |
2f77fc4b | 3062 | } else { |
dec56f6c | 3063 | ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s", |
2f77fc4b DG |
3064 | session->consumer->dst.trace_path); |
3065 | } | |
3066 | if (ret < 0) { | |
3067 | PERROR("snprintf session path"); | |
3068 | continue; | |
3069 | } | |
3070 | ||
3071 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
3072 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
8382cf6f | 3073 | sessions[i].enabled = session->active; |
2cbf8fed | 3074 | sessions[i].snapshot_mode = session->snapshot_mode; |
8960e9cd | 3075 | sessions[i].live_timer_interval = session->live_timer; |
2f77fc4b DG |
3076 | i++; |
3077 | } | |
3078 | } | |
3079 | ||
806e2684 | 3080 | /* |
6d805429 | 3081 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
d3f14b8a | 3082 | * ready for trace analysis (or any kind of reader) or else 1 for pending data. |
806e2684 | 3083 | */ |
6d805429 | 3084 | int cmd_data_pending(struct ltt_session *session) |
806e2684 DG |
3085 | { |
3086 | int ret; | |
3087 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3088 | struct ltt_ust_session *usess = session->ust_session; | |
3089 | ||
3090 | assert(session); | |
3091 | ||
3092 | /* Session MUST be stopped to ask for data availability. */ | |
8382cf6f | 3093 | if (session->active) { |
806e2684 DG |
3094 | ret = LTTNG_ERR_SESSION_STARTED; |
3095 | goto error; | |
3a89d11a DG |
3096 | } else { |
3097 | /* | |
3098 | * If stopped, just make sure we've started before else the above call | |
3099 | * will always send that there is data pending. | |
3100 | * | |
3101 | * The consumer assumes that when the data pending command is received, | |
3102 | * the trace has been started before or else no output data is written | |
3103 | * by the streams which is a condition for data pending. So, this is | |
3104 | * *VERY* important that we don't ask the consumer before a start | |
3105 | * trace. | |
3106 | */ | |
8382cf6f | 3107 | if (!session->has_been_started) { |
3a89d11a DG |
3108 | ret = 0; |
3109 | goto error; | |
3110 | } | |
806e2684 DG |
3111 | } |
3112 | ||
3113 | if (ksess && ksess->consumer) { | |
6d805429 DG |
3114 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
3115 | if (ret == 1) { | |
806e2684 DG |
3116 | /* Data is still being extracted for the kernel. */ |
3117 | goto error; | |
3118 | } | |
3119 | } | |
3120 | ||
3121 | if (usess && usess->consumer) { | |
6d805429 DG |
3122 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
3123 | if (ret == 1) { | |
806e2684 DG |
3124 | /* Data is still being extracted for the kernel. */ |
3125 | goto error; | |
3126 | } | |
3127 | } | |
3128 | ||
3129 | /* Data is ready to be read by a viewer */ | |
6d805429 | 3130 | ret = 0; |
806e2684 DG |
3131 | |
3132 | error: | |
3133 | return ret; | |
3134 | } | |
3135 | ||
6dc3064a DG |
3136 | /* |
3137 | * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library. | |
3138 | * | |
3139 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3140 | */ | |
3141 | int cmd_snapshot_add_output(struct ltt_session *session, | |
3142 | struct lttng_snapshot_output *output, uint32_t *id) | |
3143 | { | |
3144 | int ret; | |
3145 | struct snapshot_output *new_output; | |
3146 | ||
3147 | assert(session); | |
3148 | assert(output); | |
3149 | ||
3150 | DBG("Cmd snapshot add output for session %s", session->name); | |
3151 | ||
3152 | /* | |
903ef685 | 3153 | * Can't create an output if the session is not set in no-output mode. |
6dc3064a DG |
3154 | */ |
3155 | if (session->output_traces) { | |
903ef685 | 3156 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3157 | goto error; |
3158 | } | |
3159 | ||
3160 | /* Only one output is allowed until we have the "tee" feature. */ | |
3161 | if (session->snapshot.nb_output == 1) { | |
3162 | ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST; | |
3163 | goto error; | |
3164 | } | |
3165 | ||
3166 | new_output = snapshot_output_alloc(); | |
3167 | if (!new_output) { | |
3168 | ret = LTTNG_ERR_NOMEM; | |
3169 | goto error; | |
3170 | } | |
3171 | ||
3172 | ret = snapshot_output_init(output->max_size, output->name, | |
3173 | output->ctrl_url, output->data_url, session->consumer, new_output, | |
3174 | &session->snapshot); | |
3175 | if (ret < 0) { | |
3176 | if (ret == -ENOMEM) { | |
3177 | ret = LTTNG_ERR_NOMEM; | |
3178 | } else { | |
3179 | ret = LTTNG_ERR_INVALID; | |
3180 | } | |
3181 | goto free_error; | |
3182 | } | |
3183 | ||
6dc3064a DG |
3184 | rcu_read_lock(); |
3185 | snapshot_add_output(&session->snapshot, new_output); | |
3186 | if (id) { | |
3187 | *id = new_output->id; | |
3188 | } | |
3189 | rcu_read_unlock(); | |
3190 | ||
3191 | return LTTNG_OK; | |
3192 | ||
3193 | free_error: | |
3194 | snapshot_output_destroy(new_output); | |
3195 | error: | |
3196 | return ret; | |
3197 | } | |
3198 | ||
3199 | /* | |
3200 | * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl. | |
3201 | * | |
3202 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3203 | */ | |
3204 | int cmd_snapshot_del_output(struct ltt_session *session, | |
3205 | struct lttng_snapshot_output *output) | |
3206 | { | |
3207 | int ret; | |
eb240553 | 3208 | struct snapshot_output *sout = NULL; |
6dc3064a DG |
3209 | |
3210 | assert(session); | |
3211 | assert(output); | |
3212 | ||
6dc3064a DG |
3213 | rcu_read_lock(); |
3214 | ||
3215 | /* | |
d3f14b8a MD |
3216 | * Permission denied to create an output if the session is not |
3217 | * set in no output mode. | |
6dc3064a DG |
3218 | */ |
3219 | if (session->output_traces) { | |
903ef685 | 3220 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3221 | goto error; |
3222 | } | |
3223 | ||
eb240553 DG |
3224 | if (output->id) { |
3225 | DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id, | |
3226 | session->name); | |
3227 | sout = snapshot_find_output_by_id(output->id, &session->snapshot); | |
3228 | } else if (*output->name != '\0') { | |
3229 | DBG("Cmd snapshot del output name %s for session %s", output->name, | |
3230 | session->name); | |
3231 | sout = snapshot_find_output_by_name(output->name, &session->snapshot); | |
3232 | } | |
6dc3064a DG |
3233 | if (!sout) { |
3234 | ret = LTTNG_ERR_INVALID; | |
3235 | goto error; | |
3236 | } | |
3237 | ||
3238 | snapshot_delete_output(&session->snapshot, sout); | |
3239 | snapshot_output_destroy(sout); | |
3240 | ret = LTTNG_OK; | |
3241 | ||
3242 | error: | |
3243 | rcu_read_unlock(); | |
3244 | return ret; | |
3245 | } | |
3246 | ||
3247 | /* | |
3248 | * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl. | |
3249 | * | |
3250 | * If no output is available, outputs is untouched and 0 is returned. | |
3251 | * | |
3252 | * Return the size of the newly allocated outputs or a negative LTTNG_ERR code. | |
3253 | */ | |
3254 | ssize_t cmd_snapshot_list_outputs(struct ltt_session *session, | |
3255 | struct lttng_snapshot_output **outputs) | |
3256 | { | |
3257 | int ret, idx = 0; | |
b223ca94 | 3258 | struct lttng_snapshot_output *list = NULL; |
6dc3064a DG |
3259 | struct lttng_ht_iter iter; |
3260 | struct snapshot_output *output; | |
3261 | ||
3262 | assert(session); | |
3263 | assert(outputs); | |
3264 | ||
3265 | DBG("Cmd snapshot list outputs for session %s", session->name); | |
3266 | ||
3267 | /* | |
d3f14b8a MD |
3268 | * Permission denied to create an output if the session is not |
3269 | * set in no output mode. | |
6dc3064a DG |
3270 | */ |
3271 | if (session->output_traces) { | |
903ef685 JG |
3272 | ret = -LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
3273 | goto end; | |
6dc3064a DG |
3274 | } |
3275 | ||
3276 | if (session->snapshot.nb_output == 0) { | |
3277 | ret = 0; | |
903ef685 | 3278 | goto end; |
6dc3064a DG |
3279 | } |
3280 | ||
3281 | list = zmalloc(session->snapshot.nb_output * sizeof(*list)); | |
3282 | if (!list) { | |
b223ca94 | 3283 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3284 | goto end; |
6dc3064a DG |
3285 | } |
3286 | ||
3287 | /* Copy list from session to the new list object. */ | |
b223ca94 | 3288 | rcu_read_lock(); |
6dc3064a DG |
3289 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter, |
3290 | output, node.node) { | |
3291 | assert(output->consumer); | |
3292 | list[idx].id = output->id; | |
3293 | list[idx].max_size = output->max_size; | |
6ce22875 MD |
3294 | if (lttng_strncpy(list[idx].name, output->name, |
3295 | sizeof(list[idx].name))) { | |
3296 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 3297 | goto error; |
6ce22875 | 3298 | } |
6dc3064a | 3299 | if (output->consumer->type == CONSUMER_DST_LOCAL) { |
6ce22875 MD |
3300 | if (lttng_strncpy(list[idx].ctrl_url, |
3301 | output->consumer->dst.trace_path, | |
3302 | sizeof(list[idx].ctrl_url))) { | |
3303 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 3304 | goto error; |
6ce22875 | 3305 | } |
6dc3064a DG |
3306 | } else { |
3307 | /* Control URI. */ | |
3308 | ret = uri_to_str_url(&output->consumer->dst.net.control, | |
3309 | list[idx].ctrl_url, sizeof(list[idx].ctrl_url)); | |
3310 | if (ret < 0) { | |
b223ca94 | 3311 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3312 | goto error; |
6dc3064a DG |
3313 | } |
3314 | ||
3315 | /* Data URI. */ | |
3316 | ret = uri_to_str_url(&output->consumer->dst.net.data, | |
3317 | list[idx].data_url, sizeof(list[idx].data_url)); | |
3318 | if (ret < 0) { | |
b223ca94 | 3319 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3320 | goto error; |
6dc3064a DG |
3321 | } |
3322 | } | |
3323 | idx++; | |
3324 | } | |
3325 | ||
3326 | *outputs = list; | |
b223ca94 JG |
3327 | list = NULL; |
3328 | ret = session->snapshot.nb_output; | |
6dc3064a | 3329 | error: |
903ef685 | 3330 | rcu_read_unlock(); |
b223ca94 | 3331 | free(list); |
903ef685 | 3332 | end: |
b223ca94 | 3333 | return ret; |
6dc3064a DG |
3334 | } |
3335 | ||
93ec662e JD |
3336 | /* |
3337 | * Check if we can regenerate the metadata for this session. | |
3338 | * Only kernel, UST per-uid and non-live sessions are supported. | |
3339 | * | |
3340 | * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise. | |
3341 | */ | |
3342 | static | |
eded6438 | 3343 | int check_regenerate_metadata_support(struct ltt_session *session) |
93ec662e JD |
3344 | { |
3345 | int ret; | |
3346 | ||
3347 | assert(session); | |
3348 | ||
3349 | if (session->live_timer != 0) { | |
3350 | ret = LTTNG_ERR_LIVE_SESSION; | |
3351 | goto end; | |
3352 | } | |
3353 | if (!session->active) { | |
3354 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
3355 | goto end; | |
3356 | } | |
3357 | if (session->ust_session) { | |
3358 | switch (session->ust_session->buffer_type) { | |
3359 | case LTTNG_BUFFER_PER_UID: | |
3360 | break; | |
3361 | case LTTNG_BUFFER_PER_PID: | |
3362 | ret = LTTNG_ERR_PER_PID_SESSION; | |
3363 | goto end; | |
3364 | default: | |
3365 | assert(0); | |
3366 | ret = LTTNG_ERR_UNK; | |
3367 | goto end; | |
3368 | } | |
3369 | } | |
3370 | if (session->consumer->type == CONSUMER_DST_NET && | |
3371 | session->consumer->relay_minor_version < 8) { | |
3372 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; | |
3373 | goto end; | |
3374 | } | |
3375 | ret = 0; | |
3376 | ||
3377 | end: | |
3378 | return ret; | |
3379 | } | |
3380 | ||
7802bae3 LL |
3381 | static |
3382 | int clear_metadata_file(int fd) | |
3383 | { | |
3384 | int ret; | |
3385 | ||
3386 | ret = lseek(fd, 0, SEEK_SET); | |
3387 | if (ret < 0) { | |
3388 | PERROR("lseek"); | |
3389 | goto end; | |
3390 | } | |
3391 | ||
3392 | ret = ftruncate(fd, 0); | |
3393 | if (ret < 0) { | |
3394 | PERROR("ftruncate"); | |
3395 | goto end; | |
3396 | } | |
3397 | ||
3398 | end: | |
3399 | return ret; | |
3400 | } | |
3401 | ||
93ec662e | 3402 | static |
eded6438 | 3403 | int ust_regenerate_metadata(struct ltt_ust_session *usess) |
93ec662e JD |
3404 | { |
3405 | int ret = 0; | |
3406 | struct buffer_reg_uid *uid_reg = NULL; | |
3407 | struct buffer_reg_session *session_reg = NULL; | |
3408 | ||
3409 | rcu_read_lock(); | |
3410 | cds_list_for_each_entry(uid_reg, &usess->buffer_reg_uid_list, lnode) { | |
3411 | struct ust_registry_session *registry; | |
3412 | struct ust_registry_channel *chan; | |
3413 | struct lttng_ht_iter iter_chan; | |
3414 | ||
3415 | session_reg = uid_reg->registry; | |
3416 | registry = session_reg->reg.ust; | |
3417 | ||
3418 | pthread_mutex_lock(®istry->lock); | |
3419 | registry->metadata_len_sent = 0; | |
3420 | memset(registry->metadata, 0, registry->metadata_alloc_len); | |
3421 | registry->metadata_len = 0; | |
3422 | registry->metadata_version++; | |
7802bae3 LL |
3423 | if (registry->metadata_fd > 0) { |
3424 | /* Clear the metadata file's content. */ | |
3425 | ret = clear_metadata_file(registry->metadata_fd); | |
3426 | if (ret) { | |
3427 | pthread_mutex_unlock(®istry->lock); | |
3428 | goto end; | |
3429 | } | |
3430 | } | |
3431 | ||
93ec662e JD |
3432 | ret = ust_metadata_session_statedump(registry, NULL, |
3433 | registry->major, registry->minor); | |
3434 | if (ret) { | |
3435 | pthread_mutex_unlock(®istry->lock); | |
3436 | ERR("Failed to generate session metadata (err = %d)", | |
3437 | ret); | |
3438 | goto end; | |
3439 | } | |
3440 | cds_lfht_for_each_entry(registry->channels->ht, &iter_chan.iter, | |
3441 | chan, node.node) { | |
3442 | struct ust_registry_event *event; | |
3443 | struct lttng_ht_iter iter_event; | |
3444 | ||
3445 | ret = ust_metadata_channel_statedump(registry, chan); | |
3446 | if (ret) { | |
3447 | pthread_mutex_unlock(®istry->lock); | |
3448 | ERR("Failed to generate channel metadata " | |
3449 | "(err = %d)", ret); | |
3450 | goto end; | |
3451 | } | |
3452 | cds_lfht_for_each_entry(chan->ht->ht, &iter_event.iter, | |
3453 | event, node.node) { | |
3454 | ret = ust_metadata_event_statedump(registry, | |
3455 | chan, event); | |
3456 | if (ret) { | |
3457 | pthread_mutex_unlock(®istry->lock); | |
3458 | ERR("Failed to generate event metadata " | |
3459 | "(err = %d)", ret); | |
3460 | goto end; | |
3461 | } | |
3462 | } | |
3463 | } | |
3464 | pthread_mutex_unlock(®istry->lock); | |
3465 | } | |
3466 | ||
3467 | end: | |
3468 | rcu_read_unlock(); | |
3469 | return ret; | |
3470 | } | |
3471 | ||
3472 | /* | |
eded6438 | 3473 | * Command LTTNG_REGENERATE_METADATA from the lttng-ctl library. |
93ec662e JD |
3474 | * |
3475 | * Ask the consumer to truncate the existing metadata file(s) and | |
3476 | * then regenerate the metadata. Live and per-pid sessions are not | |
3477 | * supported and return an error. | |
3478 | * | |
3479 | * Return 0 on success or else a LTTNG_ERR code. | |
3480 | */ | |
eded6438 | 3481 | int cmd_regenerate_metadata(struct ltt_session *session) |
93ec662e JD |
3482 | { |
3483 | int ret; | |
3484 | ||
3485 | assert(session); | |
3486 | ||
eded6438 | 3487 | ret = check_regenerate_metadata_support(session); |
93ec662e JD |
3488 | if (ret) { |
3489 | goto end; | |
3490 | } | |
3491 | ||
3492 | if (session->kernel_session) { | |
eded6438 | 3493 | ret = kernctl_session_regenerate_metadata( |
93ec662e JD |
3494 | session->kernel_session->fd); |
3495 | if (ret < 0) { | |
3496 | ERR("Failed to regenerate the kernel metadata"); | |
3497 | goto end; | |
3498 | } | |
3499 | } | |
3500 | ||
3501 | if (session->ust_session) { | |
eded6438 | 3502 | ret = ust_regenerate_metadata(session->ust_session); |
93ec662e JD |
3503 | if (ret < 0) { |
3504 | ERR("Failed to regenerate the UST metadata"); | |
3505 | goto end; | |
3506 | } | |
3507 | } | |
3508 | DBG("Cmd metadata regenerate for session %s", session->name); | |
3509 | ret = LTTNG_OK; | |
3510 | ||
3511 | end: | |
3512 | return ret; | |
3513 | } | |
3514 | ||
c2561365 JD |
3515 | /* |
3516 | * Command LTTNG_REGENERATE_STATEDUMP from the lttng-ctl library. | |
3517 | * | |
3518 | * Ask the tracer to regenerate a new statedump. | |
3519 | * | |
3520 | * Return 0 on success or else a LTTNG_ERR code. | |
3521 | */ | |
3522 | int cmd_regenerate_statedump(struct ltt_session *session) | |
3523 | { | |
3524 | int ret; | |
3525 | ||
3526 | assert(session); | |
3527 | ||
3528 | if (!session->active) { | |
3529 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
3530 | goto end; | |
3531 | } | |
3532 | ret = 0; | |
3533 | ||
3534 | if (session->kernel_session) { | |
3535 | ret = kernctl_session_regenerate_statedump( | |
3536 | session->kernel_session->fd); | |
3537 | /* | |
3538 | * Currently, the statedump in kernel can only fail if out | |
3539 | * of memory. | |
3540 | */ | |
3541 | if (ret < 0) { | |
3542 | if (ret == -ENOMEM) { | |
3543 | ret = LTTNG_ERR_REGEN_STATEDUMP_NOMEM; | |
3544 | } else { | |
3545 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
3546 | } | |
3547 | ERR("Failed to regenerate the kernel statedump"); | |
3548 | goto end; | |
3549 | } | |
3550 | } | |
3551 | ||
3552 | if (session->ust_session) { | |
3553 | ret = ust_app_regenerate_statedump_all(session->ust_session); | |
3554 | /* | |
3555 | * Currently, the statedump in UST always returns 0. | |
3556 | */ | |
3557 | if (ret < 0) { | |
3558 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
3559 | ERR("Failed to regenerate the UST statedump"); | |
3560 | goto end; | |
3561 | } | |
3562 | } | |
3563 | DBG("Cmd regenerate statedump for session %s", session->name); | |
3564 | ret = LTTNG_OK; | |
3565 | ||
3566 | end: | |
3567 | return ret; | |
3568 | } | |
3569 | ||
db671df9 JG |
3570 | int cmd_register_trigger(struct command_ctx *cmd_ctx, int sock) |
3571 | { | |
3572 | int ret; | |
3573 | size_t trigger_len; | |
3574 | ssize_t sock_recv_len; | |
3575 | char *trigger_buffer = NULL; | |
3576 | struct lttng_trigger *trigger = NULL; | |
3577 | ||
3578 | trigger_len = (size_t) cmd_ctx->lsm->u.trigger.header.len; | |
3579 | trigger_buffer = zmalloc(trigger_len); | |
3580 | if (!trigger_buffer) { | |
3581 | ret = LTTNG_ERR_NOMEM; | |
3582 | goto end; | |
3583 | } | |
3584 | ||
3585 | sock_recv_len = lttcomm_recv_unix_sock(sock, trigger_buffer, | |
3586 | trigger_len); | |
3587 | if (sock_recv_len < 0 || sock_recv_len != trigger_len) { | |
3588 | ERR("Failed to receive \"register trigger\" command payload"); | |
3589 | goto end; | |
3590 | } | |
3591 | ||
3592 | if (lttng_trigger_create_from_buffer(trigger_buffer, &trigger) != | |
3593 | trigger_len) { | |
3594 | ERR("Invalid trigger payload received in \"register trigger\" command"); | |
3595 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
3596 | goto end; | |
3597 | } | |
3598 | DBG("Command register trigger succeeded"); | |
3599 | ret = LTTNG_OK; | |
3600 | end: | |
3601 | free(trigger_buffer); | |
3602 | lttng_trigger_destroy(trigger); | |
3603 | return ret; | |
3604 | } | |
3605 | ||
6dc3064a DG |
3606 | /* |
3607 | * Send relayd sockets from snapshot output to consumer. Ignore request if the | |
3608 | * snapshot output is *not* set with a remote destination. | |
3609 | * | |
a934f4af | 3610 | * Return 0 on success or a LTTNG_ERR code. |
6dc3064a DG |
3611 | */ |
3612 | static int set_relayd_for_snapshot(struct consumer_output *consumer, | |
3613 | struct snapshot_output *snap_output, struct ltt_session *session) | |
3614 | { | |
a934f4af | 3615 | int ret = LTTNG_OK; |
6dc3064a DG |
3616 | struct lttng_ht_iter iter; |
3617 | struct consumer_socket *socket; | |
3618 | ||
3619 | assert(consumer); | |
3620 | assert(snap_output); | |
3621 | assert(session); | |
3622 | ||
3623 | DBG2("Set relayd object from snapshot output"); | |
3624 | ||
3625 | /* Ignore if snapshot consumer output is not network. */ | |
3626 | if (snap_output->consumer->type != CONSUMER_DST_NET) { | |
3627 | goto error; | |
3628 | } | |
3629 | ||
3630 | /* | |
3631 | * For each consumer socket, create and send the relayd object of the | |
3632 | * snapshot output. | |
3633 | */ | |
3634 | rcu_read_lock(); | |
5eecee74 DG |
3635 | cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter, |
3636 | socket, node.node) { | |
6dc3064a | 3637 | ret = send_consumer_relayd_sockets(0, session->id, |
d3e2ba59 JD |
3638 | snap_output->consumer, socket, |
3639 | session->name, session->hostname, | |
3640 | session->live_timer); | |
a934f4af | 3641 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3642 | rcu_read_unlock(); |
3643 | goto error; | |
3644 | } | |
3645 | } | |
3646 | rcu_read_unlock(); | |
3647 | ||
3648 | error: | |
3649 | return ret; | |
3650 | } | |
3651 | ||
3652 | /* | |
3653 | * Record a kernel snapshot. | |
3654 | * | |
fac41e72 | 3655 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a DG |
3656 | */ |
3657 | static int record_kernel_snapshot(struct ltt_kernel_session *ksess, | |
5c786ded | 3658 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3659 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3660 | { |
3661 | int ret; | |
3662 | ||
3663 | assert(ksess); | |
3664 | assert(output); | |
3665 | assert(session); | |
3666 | ||
10a50311 | 3667 | |
af706bb7 DG |
3668 | /* |
3669 | * Copy kernel session sockets so we can communicate with the right | |
3670 | * consumer for the snapshot record command. | |
3671 | */ | |
3672 | ret = consumer_copy_sockets(output->consumer, ksess->consumer); | |
3673 | if (ret < 0) { | |
a934f4af | 3674 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3675 | goto error; |
6dc3064a DG |
3676 | } |
3677 | ||
3678 | ret = set_relayd_for_snapshot(ksess->consumer, output, session); | |
a934f4af | 3679 | if (ret != LTTNG_OK) { |
af706bb7 | 3680 | goto error_snapshot; |
6dc3064a DG |
3681 | } |
3682 | ||
d07ceecd | 3683 | ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream); |
2a06df8d | 3684 | if (ret != LTTNG_OK) { |
af706bb7 | 3685 | goto error_snapshot; |
6dc3064a DG |
3686 | } |
3687 | ||
a934f4af | 3688 | ret = LTTNG_OK; |
1371fc12 | 3689 | goto end; |
a934f4af | 3690 | |
af706bb7 DG |
3691 | error_snapshot: |
3692 | /* Clean up copied sockets so this output can use some other later on. */ | |
3693 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a | 3694 | error: |
1371fc12 | 3695 | end: |
6dc3064a DG |
3696 | return ret; |
3697 | } | |
3698 | ||
3699 | /* | |
3700 | * Record a UST snapshot. | |
3701 | * | |
a934f4af | 3702 | * Return 0 on success or a LTTNG_ERR error code. |
6dc3064a DG |
3703 | */ |
3704 | static int record_ust_snapshot(struct ltt_ust_session *usess, | |
5c786ded | 3705 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3706 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3707 | { |
3708 | int ret; | |
3709 | ||
3710 | assert(usess); | |
3711 | assert(output); | |
3712 | assert(session); | |
3713 | ||
af706bb7 | 3714 | /* |
d3f14b8a | 3715 | * Copy UST session sockets so we can communicate with the right |
af706bb7 DG |
3716 | * consumer for the snapshot record command. |
3717 | */ | |
3718 | ret = consumer_copy_sockets(output->consumer, usess->consumer); | |
3719 | if (ret < 0) { | |
a934f4af | 3720 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3721 | goto error; |
6dc3064a DG |
3722 | } |
3723 | ||
3724 | ret = set_relayd_for_snapshot(usess->consumer, output, session); | |
a934f4af | 3725 | if (ret != LTTNG_OK) { |
af706bb7 | 3726 | goto error_snapshot; |
6dc3064a DG |
3727 | } |
3728 | ||
d07ceecd | 3729 | ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream); |
6dc3064a | 3730 | if (ret < 0) { |
7badf927 DG |
3731 | switch (-ret) { |
3732 | case EINVAL: | |
a934f4af | 3733 | ret = LTTNG_ERR_INVALID; |
7badf927 | 3734 | break; |
7badf927 DG |
3735 | default: |
3736 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
3737 | break; | |
5c786ded | 3738 | } |
af706bb7 | 3739 | goto error_snapshot; |
6dc3064a DG |
3740 | } |
3741 | ||
a934f4af DG |
3742 | ret = LTTNG_OK; |
3743 | ||
af706bb7 DG |
3744 | error_snapshot: |
3745 | /* Clean up copied sockets so this output can use some other later on. */ | |
3746 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a DG |
3747 | error: |
3748 | return ret; | |
3749 | } | |
3750 | ||
d07ceecd MD |
3751 | static |
3752 | uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session, | |
3753 | uint64_t cur_nr_packets) | |
68808f4e | 3754 | { |
d07ceecd | 3755 | uint64_t tot_size = 0; |
68808f4e DG |
3756 | |
3757 | if (session->kernel_session) { | |
3758 | struct ltt_kernel_channel *chan; | |
3759 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3760 | ||
68808f4e | 3761 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
d07ceecd MD |
3762 | if (cur_nr_packets >= chan->channel->attr.num_subbuf) { |
3763 | /* | |
3764 | * Don't take channel into account if we | |
3765 | * already grab all its packets. | |
3766 | */ | |
3767 | continue; | |
68808f4e | 3768 | } |
d07ceecd MD |
3769 | tot_size += chan->channel->attr.subbuf_size |
3770 | * chan->stream_count; | |
68808f4e DG |
3771 | } |
3772 | } | |
3773 | ||
3774 | if (session->ust_session) { | |
68808f4e DG |
3775 | struct ltt_ust_session *usess = session->ust_session; |
3776 | ||
d07ceecd MD |
3777 | tot_size += ust_app_get_size_one_more_packet_per_stream(usess, |
3778 | cur_nr_packets); | |
68808f4e DG |
3779 | } |
3780 | ||
d07ceecd | 3781 | return tot_size; |
68808f4e DG |
3782 | } |
3783 | ||
5c786ded | 3784 | /* |
d07ceecd MD |
3785 | * Calculate the number of packets we can grab from each stream that |
3786 | * fits within the overall snapshot max size. | |
3787 | * | |
3788 | * Returns -1 on error, 0 means infinite number of packets, else > 0 is | |
3789 | * the number of packets per stream. | |
3790 | * | |
3791 | * TODO: this approach is not perfect: we consider the worse case | |
3792 | * (packet filling the sub-buffers) as an upper bound, but we could do | |
3793 | * better if we do this calculation while we actually grab the packet | |
3794 | * content: we would know how much padding we don't actually store into | |
3795 | * the file. | |
3796 | * | |
3797 | * This algorithm is currently bounded by the number of packets per | |
3798 | * stream. | |
3799 | * | |
3800 | * Since we call this algorithm before actually grabbing the data, it's | |
3801 | * an approximation: for instance, applications could appear/disappear | |
3802 | * in between this call and actually grabbing data. | |
5c786ded | 3803 | */ |
d07ceecd MD |
3804 | static |
3805 | int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size) | |
5c786ded | 3806 | { |
d07ceecd MD |
3807 | int64_t size_left; |
3808 | uint64_t cur_nb_packets = 0; | |
5c786ded | 3809 | |
d07ceecd MD |
3810 | if (!max_size) { |
3811 | return 0; /* Infinite */ | |
5c786ded JD |
3812 | } |
3813 | ||
d07ceecd MD |
3814 | size_left = max_size; |
3815 | for (;;) { | |
3816 | uint64_t one_more_packet_tot_size; | |
5c786ded | 3817 | |
d07ceecd MD |
3818 | one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session, |
3819 | cur_nb_packets); | |
3820 | if (!one_more_packet_tot_size) { | |
3821 | /* We are already grabbing all packets. */ | |
3822 | break; | |
3823 | } | |
3824 | size_left -= one_more_packet_tot_size; | |
3825 | if (size_left < 0) { | |
3826 | break; | |
3827 | } | |
3828 | cur_nb_packets++; | |
5c786ded | 3829 | } |
d07ceecd MD |
3830 | if (!cur_nb_packets) { |
3831 | /* Not enough room to grab one packet of each stream, error. */ | |
3832 | return -1; | |
3833 | } | |
3834 | return cur_nb_packets; | |
5c786ded JD |
3835 | } |
3836 | ||
6dc3064a DG |
3837 | /* |
3838 | * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl. | |
3839 | * | |
3840 | * The wait parameter is ignored so this call always wait for the snapshot to | |
3841 | * complete before returning. | |
3842 | * | |
3843 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3844 | */ | |
3845 | int cmd_snapshot_record(struct ltt_session *session, | |
3846 | struct lttng_snapshot_output *output, int wait) | |
3847 | { | |
3848 | int ret = LTTNG_OK; | |
e1986656 DG |
3849 | unsigned int use_tmp_output = 0; |
3850 | struct snapshot_output tmp_output; | |
00e1dfc4 | 3851 | unsigned int snapshot_success = 0; |
10ba83fe | 3852 | char datetime[16]; |
6dc3064a DG |
3853 | |
3854 | assert(session); | |
ba45d9f0 | 3855 | assert(output); |
6dc3064a DG |
3856 | |
3857 | DBG("Cmd snapshot record for session %s", session->name); | |
3858 | ||
10ba83fe JR |
3859 | /* Get the datetime for the snapshot output directory. */ |
3860 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", datetime, | |
3861 | sizeof(datetime)); | |
3862 | if (!ret) { | |
3863 | ret = LTTNG_ERR_INVALID; | |
3864 | goto error; | |
3865 | } | |
3866 | ||
6dc3064a | 3867 | /* |
d3f14b8a MD |
3868 | * Permission denied to create an output if the session is not |
3869 | * set in no output mode. | |
6dc3064a DG |
3870 | */ |
3871 | if (session->output_traces) { | |
903ef685 | 3872 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3873 | goto error; |
3874 | } | |
3875 | ||
3876 | /* The session needs to be started at least once. */ | |
8382cf6f | 3877 | if (!session->has_been_started) { |
6dc3064a DG |
3878 | ret = LTTNG_ERR_START_SESSION_ONCE; |
3879 | goto error; | |
3880 | } | |
3881 | ||
3882 | /* Use temporary output for the session. */ | |
ba45d9f0 | 3883 | if (*output->ctrl_url != '\0') { |
6dc3064a DG |
3884 | ret = snapshot_output_init(output->max_size, output->name, |
3885 | output->ctrl_url, output->data_url, session->consumer, | |
e1986656 | 3886 | &tmp_output, NULL); |
6dc3064a DG |
3887 | if (ret < 0) { |
3888 | if (ret == -ENOMEM) { | |
3889 | ret = LTTNG_ERR_NOMEM; | |
3890 | } else { | |
3891 | ret = LTTNG_ERR_INVALID; | |
3892 | } | |
3893 | goto error; | |
3894 | } | |
1bfe7328 DG |
3895 | /* Use the global session count for the temporary snapshot. */ |
3896 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; | |
10ba83fe JR |
3897 | |
3898 | /* Use the global datetime */ | |
3899 | memcpy(tmp_output.datetime, datetime, sizeof(datetime)); | |
e1986656 | 3900 | use_tmp_output = 1; |
6dc3064a DG |
3901 | } |
3902 | ||
804c90a8 JR |
3903 | if (use_tmp_output) { |
3904 | int64_t nb_packets_per_stream; | |
6dc3064a | 3905 | |
804c90a8 JR |
3906 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, |
3907 | tmp_output.max_size); | |
3908 | if (nb_packets_per_stream < 0) { | |
3909 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
3910 | goto error; | |
3911 | } | |
d07ceecd | 3912 | |
804c90a8 JR |
3913 | if (session->kernel_session) { |
3914 | ret = record_kernel_snapshot(session->kernel_session, | |
3915 | &tmp_output, session, | |
3916 | wait, nb_packets_per_stream); | |
3917 | if (ret != LTTNG_OK) { | |
d07ceecd MD |
3918 | goto error; |
3919 | } | |
804c90a8 JR |
3920 | } |
3921 | ||
3922 | if (session->ust_session) { | |
3923 | ret = record_ust_snapshot(session->ust_session, | |
3924 | &tmp_output, session, | |
d07ceecd | 3925 | wait, nb_packets_per_stream); |
a934f4af | 3926 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3927 | goto error; |
3928 | } | |
804c90a8 | 3929 | } |
e1986656 | 3930 | |
804c90a8 JR |
3931 | snapshot_success = 1; |
3932 | } else { | |
3933 | struct snapshot_output *sout; | |
3934 | struct lttng_ht_iter iter; | |
68808f4e | 3935 | |
804c90a8 JR |
3936 | rcu_read_lock(); |
3937 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
3938 | &iter.iter, sout, node.node) { | |
3939 | int64_t nb_packets_per_stream; | |
e1986656 | 3940 | |
804c90a8 JR |
3941 | /* |
3942 | * Make a local copy of the output and assign the possible | |
3943 | * temporary value given by the caller. | |
3944 | */ | |
3945 | memset(&tmp_output, 0, sizeof(tmp_output)); | |
3946 | memcpy(&tmp_output, sout, sizeof(tmp_output)); | |
1bfe7328 | 3947 | |
804c90a8 JR |
3948 | if (output->max_size != (uint64_t) -1ULL) { |
3949 | tmp_output.max_size = output->max_size; | |
6dc3064a | 3950 | } |
d07ceecd MD |
3951 | |
3952 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
3953 | tmp_output.max_size); | |
3954 | if (nb_packets_per_stream < 0) { | |
3955 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
804c90a8 | 3956 | rcu_read_unlock(); |
d07ceecd MD |
3957 | goto error; |
3958 | } | |
6dc3064a | 3959 | |
804c90a8 JR |
3960 | /* Use temporary name. */ |
3961 | if (*output->name != '\0') { | |
cf3e357d MD |
3962 | if (lttng_strncpy(tmp_output.name, output->name, |
3963 | sizeof(tmp_output.name))) { | |
3964 | ret = LTTNG_ERR_INVALID; | |
3965 | rcu_read_unlock(); | |
3966 | goto error; | |
3967 | } | |
804c90a8 | 3968 | } |
e1986656 | 3969 | |
804c90a8 | 3970 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; |
10ba83fe | 3971 | memcpy(tmp_output.datetime, datetime, sizeof(datetime)); |
e1986656 | 3972 | |
804c90a8 JR |
3973 | if (session->kernel_session) { |
3974 | ret = record_kernel_snapshot(session->kernel_session, | |
3975 | &tmp_output, session, | |
3976 | wait, nb_packets_per_stream); | |
3977 | if (ret != LTTNG_OK) { | |
d07ceecd | 3978 | rcu_read_unlock(); |
68808f4e DG |
3979 | goto error; |
3980 | } | |
804c90a8 | 3981 | } |
68808f4e | 3982 | |
804c90a8 JR |
3983 | if (session->ust_session) { |
3984 | ret = record_ust_snapshot(session->ust_session, | |
3985 | &tmp_output, session, | |
d07ceecd | 3986 | wait, nb_packets_per_stream); |
a934f4af | 3987 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3988 | rcu_read_unlock(); |
3989 | goto error; | |
3990 | } | |
3991 | } | |
804c90a8 | 3992 | snapshot_success = 1; |
6dc3064a | 3993 | } |
804c90a8 | 3994 | rcu_read_unlock(); |
6dc3064a DG |
3995 | } |
3996 | ||
1bfe7328 DG |
3997 | if (snapshot_success) { |
3998 | session->snapshot.nb_snapshot++; | |
b67578cb MD |
3999 | } else { |
4000 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
1bfe7328 DG |
4001 | } |
4002 | ||
6dc3064a | 4003 | error: |
6dc3064a DG |
4004 | return ret; |
4005 | } | |
4006 | ||
d7ba1388 MD |
4007 | /* |
4008 | * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread. | |
4009 | */ | |
4010 | int cmd_set_session_shm_path(struct ltt_session *session, | |
4011 | const char *shm_path) | |
4012 | { | |
4013 | /* Safety net */ | |
4014 | assert(session); | |
4015 | ||
4016 | /* | |
4017 | * Can only set shm path before session is started. | |
4018 | */ | |
4019 | if (session->has_been_started) { | |
4020 | return LTTNG_ERR_SESSION_STARTED; | |
4021 | } | |
4022 | ||
4023 | strncpy(session->shm_path, shm_path, | |
4024 | sizeof(session->shm_path)); | |
4025 | session->shm_path[sizeof(session->shm_path) - 1] = '\0'; | |
4026 | ||
4027 | return 0; | |
4028 | } | |
4029 | ||
2f77fc4b DG |
4030 | /* |
4031 | * Init command subsystem. | |
4032 | */ | |
4033 | void cmd_init(void) | |
4034 | { | |
4035 | /* | |
d88aee68 DG |
4036 | * Set network sequence index to 1 for streams to match a relayd |
4037 | * socket on the consumer side. | |
2f77fc4b | 4038 | */ |
d88aee68 DG |
4039 | pthread_mutex_lock(&relayd_net_seq_idx_lock); |
4040 | relayd_net_seq_idx = 1; | |
4041 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
4042 | |
4043 | DBG("Command subsystem initialized"); | |
4044 | } |