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