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> |
2f77fc4b DG |
31 | |
32 | #include "channel.h" | |
33 | #include "consumer.h" | |
34 | #include "event.h" | |
8782cc74 | 35 | #include "health-sessiond.h" |
2f77fc4b DG |
36 | #include "kernel.h" |
37 | #include "kernel-consumer.h" | |
38 | #include "lttng-sessiond.h" | |
39 | #include "utils.h" | |
834978fd | 40 | #include "syscall.h" |
7c1d2758 | 41 | #include "agent.h" |
2f77fc4b DG |
42 | |
43 | #include "cmd.h" | |
44 | ||
45 | /* | |
46 | * Used to keep a unique index for each relayd socket created where this value | |
47 | * is associated with streams on the consumer so it can match the right relayd | |
d88aee68 DG |
48 | * to send to. It must be accessed with the relayd_net_seq_idx_lock |
49 | * held. | |
2f77fc4b | 50 | */ |
d88aee68 DG |
51 | static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER; |
52 | static uint64_t relayd_net_seq_idx; | |
2f77fc4b | 53 | |
7076b56e JG |
54 | static int validate_event_name(const char *); |
55 | static int validate_ust_event_name(const char *); | |
56 | static int cmd_enable_event_internal(struct ltt_session *session, | |
57 | struct lttng_domain *domain, | |
58 | char *channel_name, struct lttng_event *event, | |
59 | char *filter_expression, | |
60 | struct lttng_filter_bytecode *filter, | |
61 | struct lttng_event_exclusion *exclusion, | |
62 | int wpipe); | |
63 | ||
2f77fc4b DG |
64 | /* |
65 | * Create a session path used by list_lttng_sessions for the case that the | |
66 | * session consumer is on the network. | |
67 | */ | |
68 | static int build_network_session_path(char *dst, size_t size, | |
69 | struct ltt_session *session) | |
70 | { | |
71 | int ret, kdata_port, udata_port; | |
72 | struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL; | |
73 | char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX]; | |
74 | ||
75 | assert(session); | |
76 | assert(dst); | |
77 | ||
78 | memset(tmp_urls, 0, sizeof(tmp_urls)); | |
79 | memset(tmp_uurl, 0, sizeof(tmp_uurl)); | |
80 | ||
81 | kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT; | |
82 | ||
83 | if (session->kernel_session && session->kernel_session->consumer) { | |
84 | kuri = &session->kernel_session->consumer->dst.net.control; | |
85 | kdata_port = session->kernel_session->consumer->dst.net.data.port; | |
86 | } | |
87 | ||
88 | if (session->ust_session && session->ust_session->consumer) { | |
89 | uuri = &session->ust_session->consumer->dst.net.control; | |
90 | udata_port = session->ust_session->consumer->dst.net.data.port; | |
91 | } | |
92 | ||
93 | if (uuri == NULL && kuri == NULL) { | |
94 | uri = &session->consumer->dst.net.control; | |
95 | kdata_port = session->consumer->dst.net.data.port; | |
96 | } else if (kuri && uuri) { | |
97 | ret = uri_compare(kuri, uuri); | |
98 | if (ret) { | |
99 | /* Not Equal */ | |
100 | uri = kuri; | |
101 | /* Build uuri URL string */ | |
102 | ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl)); | |
103 | if (ret < 0) { | |
104 | goto error; | |
105 | } | |
106 | } else { | |
107 | uri = kuri; | |
108 | } | |
109 | } else if (kuri && uuri == NULL) { | |
110 | uri = kuri; | |
111 | } else if (uuri && kuri == NULL) { | |
112 | uri = uuri; | |
113 | } | |
114 | ||
115 | ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls)); | |
116 | if (ret < 0) { | |
117 | goto error; | |
118 | } | |
119 | ||
9aa9f900 DG |
120 | /* |
121 | * Do we have a UST url set. If yes, this means we have both kernel and UST | |
122 | * to print. | |
123 | */ | |
9d035200 | 124 | if (*tmp_uurl != '\0') { |
2f77fc4b DG |
125 | ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]", |
126 | tmp_urls, kdata_port, tmp_uurl, udata_port); | |
127 | } else { | |
9aa9f900 | 128 | int dport; |
bef08707 | 129 | if (kuri || (!kuri && !uuri)) { |
9aa9f900 DG |
130 | dport = kdata_port; |
131 | } else { | |
132 | /* No kernel URI, use the UST port. */ | |
133 | dport = udata_port; | |
134 | } | |
135 | ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport); | |
2f77fc4b DG |
136 | } |
137 | ||
138 | error: | |
139 | return ret; | |
140 | } | |
141 | ||
fb83fe64 JD |
142 | /* |
143 | * Get run-time attributes if the session has been started (discarded events, | |
144 | * lost packets). | |
145 | */ | |
146 | static int get_kernel_runtime_stats(struct ltt_session *session, | |
147 | struct ltt_kernel_channel *kchan, uint64_t *discarded_events, | |
148 | uint64_t *lost_packets) | |
149 | { | |
150 | int ret; | |
151 | ||
152 | if (!session->has_been_started) { | |
153 | ret = 0; | |
154 | *discarded_events = 0; | |
155 | *lost_packets = 0; | |
156 | goto end; | |
157 | } | |
158 | ||
159 | ret = consumer_get_discarded_events(session->id, kchan->fd, | |
160 | session->kernel_session->consumer, | |
161 | discarded_events); | |
162 | if (ret < 0) { | |
163 | goto end; | |
164 | } | |
165 | ||
166 | ret = consumer_get_lost_packets(session->id, kchan->fd, | |
167 | session->kernel_session->consumer, | |
168 | lost_packets); | |
169 | if (ret < 0) { | |
170 | goto end; | |
171 | } | |
172 | ||
173 | end: | |
174 | return ret; | |
175 | } | |
176 | ||
177 | /* | |
178 | * Get run-time attributes if the session has been started (discarded events, | |
179 | * lost packets). | |
180 | */ | |
181 | static int get_ust_runtime_stats(struct ltt_session *session, | |
182 | struct ltt_ust_channel *uchan, uint64_t *discarded_events, | |
183 | uint64_t *lost_packets) | |
184 | { | |
185 | int ret; | |
186 | struct ltt_ust_session *usess; | |
187 | ||
188 | usess = session->ust_session; | |
189 | ||
190 | if (!usess || !session->has_been_started) { | |
191 | *discarded_events = 0; | |
192 | *lost_packets = 0; | |
193 | ret = 0; | |
194 | goto end; | |
195 | } | |
196 | ||
197 | if (usess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
198 | ret = ust_app_uid_get_channel_runtime_stats(usess->id, | |
199 | &usess->buffer_reg_uid_list, | |
200 | usess->consumer, uchan->id, | |
201 | uchan->attr.overwrite, | |
202 | discarded_events, | |
203 | lost_packets); | |
204 | } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
205 | ret = ust_app_pid_get_channel_runtime_stats(usess, | |
206 | uchan, usess->consumer, | |
207 | uchan->attr.overwrite, | |
208 | discarded_events, | |
209 | lost_packets); | |
210 | if (ret < 0) { | |
211 | goto end; | |
212 | } | |
213 | *discarded_events += uchan->per_pid_closed_app_discarded; | |
214 | *lost_packets += uchan->per_pid_closed_app_lost; | |
215 | } else { | |
216 | ERR("Unsupported buffer type"); | |
217 | ret = -1; | |
218 | goto end; | |
219 | } | |
220 | ||
221 | end: | |
222 | return ret; | |
223 | } | |
224 | ||
2f77fc4b DG |
225 | /* |
226 | * Fill lttng_channel array of all channels. | |
227 | */ | |
56a37563 | 228 | static void list_lttng_channels(enum lttng_domain_type domain, |
fb83fe64 JD |
229 | struct ltt_session *session, struct lttng_channel *channels, |
230 | struct lttcomm_channel_extended *chan_exts) | |
2f77fc4b | 231 | { |
fb83fe64 | 232 | int i = 0, ret; |
2f77fc4b DG |
233 | struct ltt_kernel_channel *kchan; |
234 | ||
235 | DBG("Listing channels for session %s", session->name); | |
236 | ||
237 | switch (domain) { | |
238 | case LTTNG_DOMAIN_KERNEL: | |
239 | /* Kernel channels */ | |
240 | if (session->kernel_session != NULL) { | |
241 | cds_list_for_each_entry(kchan, | |
242 | &session->kernel_session->channel_list.head, list) { | |
fb83fe64 JD |
243 | uint64_t discarded_events, lost_packets; |
244 | ||
245 | ret = get_kernel_runtime_stats(session, kchan, | |
246 | &discarded_events, &lost_packets); | |
247 | if (ret < 0) { | |
248 | goto end; | |
249 | } | |
2f77fc4b DG |
250 | /* Copy lttng_channel struct to array */ |
251 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
252 | channels[i].enabled = kchan->enabled; | |
fb83fe64 JD |
253 | chan_exts[i].discarded_events = |
254 | discarded_events; | |
255 | chan_exts[i].lost_packets = lost_packets; | |
2f77fc4b DG |
256 | i++; |
257 | } | |
258 | } | |
259 | break; | |
260 | case LTTNG_DOMAIN_UST: | |
261 | { | |
262 | struct lttng_ht_iter iter; | |
263 | struct ltt_ust_channel *uchan; | |
264 | ||
e7fe706f | 265 | rcu_read_lock(); |
2f77fc4b DG |
266 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
267 | &iter.iter, uchan, node.node) { | |
fb83fe64 JD |
268 | uint64_t discarded_events, lost_packets; |
269 | ||
2f77fc4b DG |
270 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); |
271 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
272 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
273 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
274 | channels[i].attr.switch_timer_interval = | |
275 | uchan->attr.switch_timer_interval; | |
276 | channels[i].attr.read_timer_interval = | |
277 | uchan->attr.read_timer_interval; | |
278 | channels[i].enabled = uchan->enabled; | |
2f785fe7 DG |
279 | channels[i].attr.tracefile_size = uchan->tracefile_size; |
280 | channels[i].attr.tracefile_count = uchan->tracefile_count; | |
5e4435a4 JG |
281 | |
282 | /* | |
283 | * Map enum lttng_ust_output to enum lttng_event_output. | |
284 | */ | |
2f77fc4b DG |
285 | switch (uchan->attr.output) { |
286 | case LTTNG_UST_MMAP: | |
2f77fc4b DG |
287 | channels[i].attr.output = LTTNG_EVENT_MMAP; |
288 | break; | |
5e4435a4 JG |
289 | default: |
290 | /* | |
291 | * LTTNG_UST_MMAP is the only supported UST | |
292 | * output mode. | |
293 | */ | |
294 | assert(0); | |
295 | break; | |
2f77fc4b | 296 | } |
fb83fe64 JD |
297 | |
298 | ret = get_ust_runtime_stats(session, uchan, | |
299 | &discarded_events, &lost_packets); | |
300 | if (ret < 0) { | |
301 | break; | |
302 | } | |
303 | chan_exts[i].discarded_events = discarded_events; | |
304 | chan_exts[i].lost_packets = lost_packets; | |
2f77fc4b DG |
305 | i++; |
306 | } | |
e7fe706f | 307 | rcu_read_unlock(); |
2f77fc4b DG |
308 | break; |
309 | } | |
310 | default: | |
311 | break; | |
312 | } | |
fb83fe64 JD |
313 | |
314 | end: | |
315 | return; | |
2f77fc4b DG |
316 | } |
317 | ||
b4e3ceb9 | 318 | static void increment_extended_len(const char *filter_expression, |
795d57ce | 319 | struct lttng_event_exclusion *exclusion, size_t *extended_len) |
b4e3ceb9 PP |
320 | { |
321 | *extended_len += sizeof(struct lttcomm_event_extended_header); | |
322 | ||
323 | if (filter_expression) { | |
324 | *extended_len += strlen(filter_expression) + 1; | |
325 | } | |
795d57ce PP |
326 | |
327 | if (exclusion) { | |
328 | *extended_len += exclusion->count * LTTNG_SYMBOL_NAME_LEN; | |
329 | } | |
b4e3ceb9 PP |
330 | } |
331 | ||
332 | static void append_extended_info(const char *filter_expression, | |
795d57ce | 333 | struct lttng_event_exclusion *exclusion, void **extended_at) |
b4e3ceb9 PP |
334 | { |
335 | struct lttcomm_event_extended_header extended_header; | |
336 | size_t filter_len = 0; | |
795d57ce | 337 | size_t nb_exclusions = 0; |
b4e3ceb9 PP |
338 | |
339 | if (filter_expression) { | |
340 | filter_len = strlen(filter_expression) + 1; | |
341 | } | |
342 | ||
795d57ce PP |
343 | if (exclusion) { |
344 | nb_exclusions = exclusion->count; | |
345 | } | |
346 | ||
347 | /* Set header fields */ | |
b4e3ceb9 | 348 | extended_header.filter_len = filter_len; |
795d57ce PP |
349 | extended_header.nb_exclusions = nb_exclusions; |
350 | ||
351 | /* Copy header */ | |
b4e3ceb9 PP |
352 | memcpy(*extended_at, &extended_header, sizeof(extended_header)); |
353 | *extended_at += sizeof(extended_header); | |
795d57ce PP |
354 | |
355 | /* Copy filter string */ | |
356 | if (filter_expression) { | |
357 | memcpy(*extended_at, filter_expression, filter_len); | |
358 | *extended_at += filter_len; | |
359 | } | |
360 | ||
361 | /* Copy exclusion names */ | |
362 | if (exclusion) { | |
363 | size_t len = nb_exclusions * LTTNG_SYMBOL_NAME_LEN; | |
364 | ||
365 | memcpy(*extended_at, &exclusion->names, len); | |
366 | *extended_at += len; | |
367 | } | |
b4e3ceb9 PP |
368 | } |
369 | ||
3c6a091f | 370 | /* |
022d91ba | 371 | * Create a list of agent domain events. |
3c6a091f DG |
372 | * |
373 | * Return number of events in list on success or else a negative value. | |
374 | */ | |
022d91ba | 375 | static int list_lttng_agent_events(struct agent *agt, |
b4e3ceb9 | 376 | struct lttng_event **events, size_t *total_size) |
3c6a091f DG |
377 | { |
378 | int i = 0, ret = 0; | |
379 | unsigned int nb_event = 0; | |
022d91ba | 380 | struct agent_event *event; |
3c6a091f DG |
381 | struct lttng_event *tmp_events; |
382 | struct lttng_ht_iter iter; | |
b4e3ceb9 PP |
383 | size_t extended_len = 0; |
384 | void *extended_at; | |
3c6a091f | 385 | |
022d91ba | 386 | assert(agt); |
3c6a091f DG |
387 | assert(events); |
388 | ||
022d91ba | 389 | DBG3("Listing agent events"); |
3c6a091f | 390 | |
e5bbf678 | 391 | rcu_read_lock(); |
022d91ba | 392 | nb_event = lttng_ht_get_count(agt->events); |
e5bbf678 | 393 | rcu_read_unlock(); |
3c6a091f DG |
394 | if (nb_event == 0) { |
395 | ret = nb_event; | |
b4e3ceb9 | 396 | *total_size = 0; |
3c6a091f DG |
397 | goto error; |
398 | } | |
399 | ||
b4e3ceb9 PP |
400 | /* Compute required extended infos size */ |
401 | extended_len = nb_event * sizeof(struct lttcomm_event_extended_header); | |
402 | ||
403 | /* | |
404 | * This is only valid because the commands which add events are | |
405 | * processed in the same thread as the listing. | |
406 | */ | |
407 | rcu_read_lock(); | |
408 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { | |
795d57ce PP |
409 | increment_extended_len(event->filter_expression, NULL, |
410 | &extended_len); | |
b4e3ceb9 PP |
411 | } |
412 | rcu_read_unlock(); | |
413 | ||
414 | *total_size = nb_event * sizeof(*tmp_events) + extended_len; | |
415 | tmp_events = zmalloc(*total_size); | |
3c6a091f | 416 | if (!tmp_events) { |
022d91ba | 417 | PERROR("zmalloc agent events session"); |
3c6a091f DG |
418 | ret = -LTTNG_ERR_FATAL; |
419 | goto error; | |
420 | } | |
421 | ||
b4e3ceb9 PP |
422 | extended_at = ((uint8_t *) tmp_events) + |
423 | nb_event * sizeof(struct lttng_event); | |
424 | ||
3c6a091f | 425 | rcu_read_lock(); |
022d91ba | 426 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
3c6a091f DG |
427 | strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name)); |
428 | tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0'; | |
429 | tmp_events[i].enabled = event->enabled; | |
2106efa0 | 430 | tmp_events[i].loglevel = event->loglevel_value; |
ff94328f | 431 | tmp_events[i].loglevel_type = event->loglevel_type; |
3c6a091f | 432 | i++; |
b4e3ceb9 PP |
433 | |
434 | /* Append extended info */ | |
795d57ce PP |
435 | append_extended_info(event->filter_expression, NULL, |
436 | &extended_at); | |
3c6a091f DG |
437 | } |
438 | rcu_read_unlock(); | |
439 | ||
440 | *events = tmp_events; | |
441 | ret = nb_event; | |
442 | ||
443 | error: | |
444 | assert(nb_event == i); | |
445 | return ret; | |
446 | } | |
447 | ||
2f77fc4b DG |
448 | /* |
449 | * Create a list of ust global domain events. | |
450 | */ | |
451 | static int list_lttng_ust_global_events(char *channel_name, | |
b4e3ceb9 PP |
452 | struct ltt_ust_domain_global *ust_global, |
453 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
454 | { |
455 | int i = 0, ret = 0; | |
456 | unsigned int nb_event = 0; | |
457 | struct lttng_ht_iter iter; | |
458 | struct lttng_ht_node_str *node; | |
459 | struct ltt_ust_channel *uchan; | |
460 | struct ltt_ust_event *uevent; | |
461 | struct lttng_event *tmp; | |
b4e3ceb9 PP |
462 | size_t extended_len = 0; |
463 | void *extended_at; | |
2f77fc4b DG |
464 | |
465 | DBG("Listing UST global events for channel %s", channel_name); | |
466 | ||
467 | rcu_read_lock(); | |
468 | ||
469 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); | |
470 | node = lttng_ht_iter_get_node_str(&iter); | |
471 | if (node == NULL) { | |
f73fabfd | 472 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
d31d3e8c | 473 | goto end; |
2f77fc4b DG |
474 | } |
475 | ||
476 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); | |
477 | ||
3c442be3 | 478 | nb_event = lttng_ht_get_count(uchan->events); |
2f77fc4b DG |
479 | if (nb_event == 0) { |
480 | ret = nb_event; | |
b4e3ceb9 | 481 | *total_size = 0; |
d31d3e8c | 482 | goto end; |
2f77fc4b DG |
483 | } |
484 | ||
485 | DBG3("Listing UST global %d events", nb_event); | |
486 | ||
b4e3ceb9 PP |
487 | /* Compute required extended infos size */ |
488 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { | |
489 | if (uevent->internal) { | |
490 | nb_event--; | |
491 | continue; | |
492 | } | |
493 | ||
494 | increment_extended_len(uevent->filter_expression, | |
795d57ce | 495 | uevent->exclusion, &extended_len); |
b4e3ceb9 | 496 | } |
d31d3e8c PP |
497 | if (nb_event == 0) { |
498 | /* All events are internal, skip. */ | |
499 | ret = 0; | |
500 | *total_size = 0; | |
501 | goto end; | |
502 | } | |
b4e3ceb9 PP |
503 | |
504 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
505 | tmp = zmalloc(*total_size); | |
2f77fc4b | 506 | if (tmp == NULL) { |
b12c38df JG |
507 | ret = -LTTNG_ERR_FATAL; |
508 | goto end; | |
2f77fc4b DG |
509 | } |
510 | ||
b4e3ceb9 PP |
511 | extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event); |
512 | ||
2f77fc4b | 513 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
3c442be3 JG |
514 | if (uevent->internal) { |
515 | /* This event should remain hidden from clients */ | |
3c442be3 JG |
516 | continue; |
517 | } | |
2f77fc4b DG |
518 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
519 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
520 | tmp[i].enabled = uevent->enabled; | |
521 | ||
522 | switch (uevent->attr.instrumentation) { | |
523 | case LTTNG_UST_TRACEPOINT: | |
524 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
525 | break; | |
526 | case LTTNG_UST_PROBE: | |
527 | tmp[i].type = LTTNG_EVENT_PROBE; | |
528 | break; | |
529 | case LTTNG_UST_FUNCTION: | |
530 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
531 | break; | |
532 | } | |
533 | ||
534 | tmp[i].loglevel = uevent->attr.loglevel; | |
535 | switch (uevent->attr.loglevel_type) { | |
536 | case LTTNG_UST_LOGLEVEL_ALL: | |
537 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
538 | break; | |
539 | case LTTNG_UST_LOGLEVEL_RANGE: | |
540 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; | |
541 | break; | |
542 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
543 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; | |
544 | break; | |
545 | } | |
546 | if (uevent->filter) { | |
547 | tmp[i].filter = 1; | |
548 | } | |
4634f12e JI |
549 | if (uevent->exclusion) { |
550 | tmp[i].exclusion = 1; | |
551 | } | |
2f77fc4b | 552 | i++; |
b4e3ceb9 PP |
553 | |
554 | /* Append extended info */ | |
795d57ce PP |
555 | append_extended_info(uevent->filter_expression, |
556 | uevent->exclusion, &extended_at); | |
2f77fc4b DG |
557 | } |
558 | ||
559 | ret = nb_event; | |
560 | *events = tmp; | |
d31d3e8c | 561 | end: |
2f77fc4b DG |
562 | rcu_read_unlock(); |
563 | return ret; | |
564 | } | |
565 | ||
566 | /* | |
567 | * Fill lttng_event array of all kernel events in the channel. | |
568 | */ | |
569 | static int list_lttng_kernel_events(char *channel_name, | |
b4e3ceb9 PP |
570 | struct ltt_kernel_session *kernel_session, |
571 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
572 | { |
573 | int i = 0, ret; | |
574 | unsigned int nb_event; | |
575 | struct ltt_kernel_event *event; | |
576 | struct ltt_kernel_channel *kchan; | |
b4e3ceb9 PP |
577 | size_t extended_len = 0; |
578 | void *extended_at; | |
2f77fc4b DG |
579 | |
580 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
581 | if (kchan == NULL) { | |
f73fabfd | 582 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
583 | goto error; |
584 | } | |
585 | ||
586 | nb_event = kchan->event_count; | |
587 | ||
588 | DBG("Listing events for channel %s", kchan->channel->name); | |
589 | ||
590 | if (nb_event == 0) { | |
b4e3ceb9 | 591 | *total_size = 0; |
834978fd | 592 | *events = NULL; |
db906c12 | 593 | goto end; |
2f77fc4b DG |
594 | } |
595 | ||
b4e3ceb9 PP |
596 | /* Compute required extended infos size */ |
597 | cds_list_for_each_entry(event, &kchan->events_list.head, list) { | |
795d57ce PP |
598 | increment_extended_len(event->filter_expression, NULL, |
599 | &extended_len); | |
b4e3ceb9 PP |
600 | } |
601 | ||
602 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
603 | *events = zmalloc(*total_size); | |
2f77fc4b | 604 | if (*events == NULL) { |
f73fabfd | 605 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
606 | goto error; |
607 | } | |
608 | ||
ab4aa612 | 609 | extended_at = ((void *) *events) + |
b4e3ceb9 PP |
610 | nb_event * sizeof(struct lttng_event); |
611 | ||
2f77fc4b DG |
612 | /* Kernel channels */ |
613 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
614 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
615 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
616 | (*events)[i].enabled = event->enabled; | |
00f992f2 JG |
617 | (*events)[i].filter = |
618 | (unsigned char) !!event->filter_expression; | |
2f77fc4b DG |
619 | |
620 | switch (event->event->instrumentation) { | |
621 | case LTTNG_KERNEL_TRACEPOINT: | |
622 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; | |
623 | break; | |
2f77fc4b | 624 | case LTTNG_KERNEL_KRETPROBE: |
1896972b DG |
625 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
626 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
627 | sizeof(struct lttng_kernel_kprobe)); | |
628 | break; | |
629 | case LTTNG_KERNEL_KPROBE: | |
2f77fc4b DG |
630 | (*events)[i].type = LTTNG_EVENT_PROBE; |
631 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
632 | sizeof(struct lttng_kernel_kprobe)); | |
633 | break; | |
634 | case LTTNG_KERNEL_FUNCTION: | |
635 | (*events)[i].type = LTTNG_EVENT_FUNCTION; | |
636 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
637 | sizeof(struct lttng_kernel_function)); | |
638 | break; | |
639 | case LTTNG_KERNEL_NOOP: | |
640 | (*events)[i].type = LTTNG_EVENT_NOOP; | |
641 | break; | |
642 | case LTTNG_KERNEL_SYSCALL: | |
643 | (*events)[i].type = LTTNG_EVENT_SYSCALL; | |
644 | break; | |
645 | case LTTNG_KERNEL_ALL: | |
646 | assert(0); | |
647 | break; | |
648 | } | |
649 | i++; | |
b4e3ceb9 PP |
650 | |
651 | /* Append extended info */ | |
795d57ce PP |
652 | append_extended_info(event->filter_expression, NULL, |
653 | &extended_at); | |
2f77fc4b DG |
654 | } |
655 | ||
db906c12 | 656 | end: |
2f77fc4b DG |
657 | return nb_event; |
658 | ||
659 | error: | |
f73fabfd DG |
660 | /* Negate the error code to differentiate the size from an error */ |
661 | return -ret; | |
2f77fc4b DG |
662 | } |
663 | ||
664 | /* | |
665 | * Add URI so the consumer output object. Set the correct path depending on the | |
666 | * domain adding the default trace directory. | |
667 | */ | |
668 | static int add_uri_to_consumer(struct consumer_output *consumer, | |
56a37563 JG |
669 | struct lttng_uri *uri, enum lttng_domain_type domain, |
670 | const char *session_name) | |
2f77fc4b | 671 | { |
f73fabfd | 672 | int ret = LTTNG_OK; |
2f77fc4b DG |
673 | const char *default_trace_dir; |
674 | ||
675 | assert(uri); | |
676 | ||
677 | if (consumer == NULL) { | |
678 | DBG("No consumer detected. Don't add URI. Stopping."); | |
f73fabfd | 679 | ret = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
680 | goto error; |
681 | } | |
682 | ||
683 | switch (domain) { | |
684 | case LTTNG_DOMAIN_KERNEL: | |
685 | default_trace_dir = DEFAULT_KERNEL_TRACE_DIR; | |
686 | break; | |
687 | case LTTNG_DOMAIN_UST: | |
688 | default_trace_dir = DEFAULT_UST_TRACE_DIR; | |
689 | break; | |
690 | default: | |
691 | /* | |
692 | * This case is possible is we try to add the URI to the global tracing | |
693 | * session consumer object which in this case there is no subdir. | |
694 | */ | |
695 | default_trace_dir = ""; | |
696 | } | |
697 | ||
698 | switch (uri->dtype) { | |
699 | case LTTNG_DST_IPV4: | |
700 | case LTTNG_DST_IPV6: | |
701 | DBG2("Setting network URI to consumer"); | |
702 | ||
df75acac DG |
703 | if (consumer->type == CONSUMER_DST_NET) { |
704 | if ((uri->stype == LTTNG_STREAM_CONTROL && | |
785d2d0d DG |
705 | consumer->dst.net.control_isset) || |
706 | (uri->stype == LTTNG_STREAM_DATA && | |
707 | consumer->dst.net.data_isset)) { | |
df75acac DG |
708 | ret = LTTNG_ERR_URL_EXIST; |
709 | goto error; | |
710 | } | |
711 | } else { | |
712 | memset(&consumer->dst.net, 0, sizeof(consumer->dst.net)); | |
785d2d0d DG |
713 | } |
714 | ||
df75acac DG |
715 | consumer->type = CONSUMER_DST_NET; |
716 | ||
2f77fc4b DG |
717 | /* Set URI into consumer output object */ |
718 | ret = consumer_set_network_uri(consumer, uri); | |
719 | if (ret < 0) { | |
a74934ba | 720 | ret = -ret; |
2f77fc4b DG |
721 | goto error; |
722 | } else if (ret == 1) { | |
723 | /* | |
724 | * URI was the same in the consumer so we do not append the subdir | |
725 | * again so to not duplicate output dir. | |
726 | */ | |
f86c9f4e | 727 | ret = LTTNG_OK; |
2f77fc4b DG |
728 | goto error; |
729 | } | |
730 | ||
731 | if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) { | |
732 | ret = consumer_set_subdir(consumer, session_name); | |
733 | if (ret < 0) { | |
f73fabfd | 734 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
735 | goto error; |
736 | } | |
737 | } | |
738 | ||
739 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
740 | /* On a new subdir, reappend the default trace dir. */ | |
c30ce0b3 CB |
741 | strncat(consumer->subdir, default_trace_dir, |
742 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
743 | DBG3("Append domain trace name to subdir %s", consumer->subdir); |
744 | } | |
745 | ||
746 | break; | |
747 | case LTTNG_DST_PATH: | |
748 | DBG2("Setting trace directory path from URI to %s", uri->dst.path); | |
749 | memset(consumer->dst.trace_path, 0, | |
750 | sizeof(consumer->dst.trace_path)); | |
751 | strncpy(consumer->dst.trace_path, uri->dst.path, | |
752 | sizeof(consumer->dst.trace_path)); | |
753 | /* Append default trace dir */ | |
754 | strncat(consumer->dst.trace_path, default_trace_dir, | |
c30ce0b3 CB |
755 | sizeof(consumer->dst.trace_path) - |
756 | strlen(consumer->dst.trace_path) - 1); | |
2f77fc4b DG |
757 | /* Flag consumer as local. */ |
758 | consumer->type = CONSUMER_DST_LOCAL; | |
759 | break; | |
760 | } | |
761 | ||
a74934ba DG |
762 | ret = LTTNG_OK; |
763 | ||
2f77fc4b DG |
764 | error: |
765 | return ret; | |
766 | } | |
767 | ||
768 | /* | |
769 | * Init tracing by creating trace directory and sending fds kernel consumer. | |
770 | */ | |
771 | static int init_kernel_tracing(struct ltt_kernel_session *session) | |
772 | { | |
773 | int ret = 0; | |
774 | struct lttng_ht_iter iter; | |
775 | struct consumer_socket *socket; | |
776 | ||
777 | assert(session); | |
778 | ||
e7fe706f DG |
779 | rcu_read_lock(); |
780 | ||
2f77fc4b DG |
781 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { |
782 | cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter, | |
783 | socket, node.node) { | |
2f77fc4b | 784 | pthread_mutex_lock(socket->lock); |
f50f23d9 | 785 | ret = kernel_consumer_send_session(socket, session); |
2f77fc4b DG |
786 | pthread_mutex_unlock(socket->lock); |
787 | if (ret < 0) { | |
f73fabfd | 788 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
789 | goto error; |
790 | } | |
791 | } | |
792 | } | |
793 | ||
794 | error: | |
e7fe706f | 795 | rcu_read_unlock(); |
2f77fc4b DG |
796 | return ret; |
797 | } | |
798 | ||
799 | /* | |
800 | * Create a socket to the relayd using the URI. | |
801 | * | |
802 | * On success, the relayd_sock pointer is set to the created socket. | |
803 | * Else, it's stays untouched and a lttcomm error code is returned. | |
804 | */ | |
6151a90f | 805 | static int create_connect_relayd(struct lttng_uri *uri, |
b31610f2 JD |
806 | struct lttcomm_relayd_sock **relayd_sock, |
807 | struct consumer_output *consumer) | |
2f77fc4b DG |
808 | { |
809 | int ret; | |
6151a90f | 810 | struct lttcomm_relayd_sock *rsock; |
2f77fc4b | 811 | |
6151a90f JD |
812 | rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR, |
813 | RELAYD_VERSION_COMM_MINOR); | |
814 | if (!rsock) { | |
f73fabfd | 815 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
816 | goto error; |
817 | } | |
818 | ||
ffe60014 DG |
819 | /* |
820 | * Connect to relayd so we can proceed with a session creation. This call | |
821 | * can possibly block for an arbitrary amount of time to set the health | |
822 | * state to be in poll execution. | |
823 | */ | |
824 | health_poll_entry(); | |
6151a90f | 825 | ret = relayd_connect(rsock); |
ffe60014 | 826 | health_poll_exit(); |
2f77fc4b DG |
827 | if (ret < 0) { |
828 | ERR("Unable to reach lttng-relayd"); | |
f73fabfd | 829 | ret = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
830 | goto free_sock; |
831 | } | |
832 | ||
833 | /* Create socket for control stream. */ | |
834 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
835 | DBG3("Creating relayd stream socket from URI"); | |
836 | ||
837 | /* Check relayd version */ | |
6151a90f | 838 | ret = relayd_version_check(rsock); |
2f77fc4b | 839 | if (ret < 0) { |
f73fabfd | 840 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; |
2f77fc4b DG |
841 | goto close_sock; |
842 | } | |
b31610f2 JD |
843 | consumer->relay_major_version = rsock->major; |
844 | consumer->relay_minor_version = rsock->minor; | |
2f77fc4b DG |
845 | } else if (uri->stype == LTTNG_STREAM_DATA) { |
846 | DBG3("Creating relayd data socket from URI"); | |
847 | } else { | |
848 | /* Command is not valid */ | |
849 | ERR("Relayd invalid stream type: %d", uri->stype); | |
f73fabfd | 850 | ret = LTTNG_ERR_INVALID; |
2f77fc4b DG |
851 | goto close_sock; |
852 | } | |
853 | ||
6151a90f | 854 | *relayd_sock = rsock; |
2f77fc4b | 855 | |
f73fabfd | 856 | return LTTNG_OK; |
2f77fc4b DG |
857 | |
858 | close_sock: | |
6151a90f JD |
859 | /* The returned value is not useful since we are on an error path. */ |
860 | (void) relayd_close(rsock); | |
2f77fc4b | 861 | free_sock: |
6151a90f | 862 | free(rsock); |
2f77fc4b DG |
863 | error: |
864 | return ret; | |
865 | } | |
866 | ||
867 | /* | |
868 | * Connect to the relayd using URI and send the socket to the right consumer. | |
869 | */ | |
56a37563 JG |
870 | static int send_consumer_relayd_socket(enum lttng_domain_type domain, |
871 | unsigned int session_id, struct lttng_uri *relayd_uri, | |
872 | struct consumer_output *consumer, | |
d3e2ba59 JD |
873 | struct consumer_socket *consumer_sock, |
874 | char *session_name, char *hostname, int session_live_timer) | |
2f77fc4b DG |
875 | { |
876 | int ret; | |
6151a90f | 877 | struct lttcomm_relayd_sock *rsock = NULL; |
2f77fc4b | 878 | |
ffe60014 | 879 | /* Connect to relayd and make version check if uri is the control. */ |
b31610f2 | 880 | ret = create_connect_relayd(relayd_uri, &rsock, consumer); |
ffe60014 | 881 | if (ret != LTTNG_OK) { |
6151a90f | 882 | goto error; |
ffe60014 | 883 | } |
6151a90f | 884 | assert(rsock); |
ffe60014 | 885 | |
2f77fc4b | 886 | /* Set the network sequence index if not set. */ |
d88aee68 DG |
887 | if (consumer->net_seq_index == (uint64_t) -1ULL) { |
888 | pthread_mutex_lock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
889 | /* |
890 | * Increment net_seq_idx because we are about to transfer the | |
891 | * new relayd socket to the consumer. | |
d88aee68 | 892 | * Assign unique key so the consumer can match streams. |
2f77fc4b | 893 | */ |
d88aee68 DG |
894 | consumer->net_seq_index = ++relayd_net_seq_idx; |
895 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
896 | } |
897 | ||
2f77fc4b | 898 | /* Send relayd socket to consumer. */ |
6151a90f | 899 | ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer, |
d3e2ba59 JD |
900 | relayd_uri->stype, session_id, |
901 | session_name, hostname, session_live_timer); | |
2f77fc4b | 902 | if (ret < 0) { |
f73fabfd | 903 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
904 | goto close_sock; |
905 | } | |
906 | ||
c890b720 DG |
907 | /* Flag that the corresponding socket was sent. */ |
908 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
ffe60014 | 909 | consumer_sock->control_sock_sent = 1; |
c890b720 | 910 | } else if (relayd_uri->stype == LTTNG_STREAM_DATA) { |
ffe60014 | 911 | consumer_sock->data_sock_sent = 1; |
c890b720 DG |
912 | } |
913 | ||
f73fabfd | 914 | ret = LTTNG_OK; |
2f77fc4b DG |
915 | |
916 | /* | |
917 | * Close socket which was dup on the consumer side. The session daemon does | |
918 | * NOT keep track of the relayd socket(s) once transfer to the consumer. | |
919 | */ | |
920 | ||
921 | close_sock: | |
6151a90f JD |
922 | (void) relayd_close(rsock); |
923 | free(rsock); | |
2f77fc4b | 924 | |
6151a90f | 925 | error: |
ffe60014 DG |
926 | if (ret != LTTNG_OK) { |
927 | /* | |
d9078d0c DG |
928 | * The consumer output for this session should not be used anymore |
929 | * since the relayd connection failed thus making any tracing or/and | |
930 | * streaming not usable. | |
ffe60014 | 931 | */ |
d9078d0c | 932 | consumer->enabled = 0; |
ffe60014 | 933 | } |
2f77fc4b DG |
934 | return ret; |
935 | } | |
936 | ||
937 | /* | |
938 | * Send both relayd sockets to a specific consumer and domain. This is a | |
939 | * helper function to facilitate sending the information to the consumer for a | |
940 | * session. | |
941 | */ | |
56a37563 JG |
942 | static int send_consumer_relayd_sockets(enum lttng_domain_type domain, |
943 | unsigned int session_id, struct consumer_output *consumer, | |
944 | struct consumer_socket *sock, char *session_name, | |
945 | char *hostname, int session_live_timer) | |
2f77fc4b | 946 | { |
dda67f6c | 947 | int ret = LTTNG_OK; |
2f77fc4b | 948 | |
2f77fc4b | 949 | assert(consumer); |
6dc3064a | 950 | assert(sock); |
2f77fc4b | 951 | |
2f77fc4b | 952 | /* Sending control relayd socket. */ |
ffe60014 | 953 | if (!sock->control_sock_sent) { |
6dc3064a | 954 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
955 | &consumer->dst.net.control, consumer, sock, |
956 | session_name, hostname, session_live_timer); | |
c890b720 DG |
957 | if (ret != LTTNG_OK) { |
958 | goto error; | |
959 | } | |
2f77fc4b DG |
960 | } |
961 | ||
962 | /* Sending data relayd socket. */ | |
ffe60014 | 963 | if (!sock->data_sock_sent) { |
6dc3064a | 964 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
965 | &consumer->dst.net.data, consumer, sock, |
966 | session_name, hostname, session_live_timer); | |
c890b720 DG |
967 | if (ret != LTTNG_OK) { |
968 | goto error; | |
969 | } | |
2f77fc4b DG |
970 | } |
971 | ||
2f77fc4b DG |
972 | error: |
973 | return ret; | |
974 | } | |
975 | ||
976 | /* | |
977 | * Setup relayd connections for a tracing session. First creates the socket to | |
978 | * the relayd and send them to the right domain consumer. Consumer type MUST be | |
979 | * network. | |
980 | */ | |
ffe60014 | 981 | int cmd_setup_relayd(struct ltt_session *session) |
2f77fc4b | 982 | { |
f73fabfd | 983 | int ret = LTTNG_OK; |
2f77fc4b DG |
984 | struct ltt_ust_session *usess; |
985 | struct ltt_kernel_session *ksess; | |
986 | struct consumer_socket *socket; | |
987 | struct lttng_ht_iter iter; | |
988 | ||
989 | assert(session); | |
990 | ||
991 | usess = session->ust_session; | |
992 | ksess = session->kernel_session; | |
993 | ||
785d2d0d | 994 | DBG("Setting relayd for session %s", session->name); |
2f77fc4b | 995 | |
e7fe706f DG |
996 | rcu_read_lock(); |
997 | ||
2f77fc4b DG |
998 | if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET |
999 | && usess->consumer->enabled) { | |
1000 | /* For each consumer socket, send relayd sockets */ | |
1001 | cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, | |
1002 | socket, node.node) { | |
2f77fc4b | 1003 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1004 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id, |
d3e2ba59 JD |
1005 | usess->consumer, socket, |
1006 | session->name, session->hostname, | |
1007 | session->live_timer); | |
2f77fc4b | 1008 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1009 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1010 | goto error; |
1011 | } | |
6dc3064a DG |
1012 | /* Session is now ready for network streaming. */ |
1013 | session->net_handle = 1; | |
2f77fc4b | 1014 | } |
b31610f2 JD |
1015 | session->consumer->relay_major_version = |
1016 | usess->consumer->relay_major_version; | |
1017 | session->consumer->relay_minor_version = | |
1018 | usess->consumer->relay_minor_version; | |
2f77fc4b DG |
1019 | } |
1020 | ||
1021 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET | |
1022 | && ksess->consumer->enabled) { | |
1023 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1024 | socket, node.node) { | |
2f77fc4b | 1025 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1026 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id, |
d3e2ba59 JD |
1027 | ksess->consumer, socket, |
1028 | session->name, session->hostname, | |
1029 | session->live_timer); | |
2f77fc4b | 1030 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1031 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1032 | goto error; |
1033 | } | |
6dc3064a DG |
1034 | /* Session is now ready for network streaming. */ |
1035 | session->net_handle = 1; | |
2f77fc4b | 1036 | } |
b31610f2 JD |
1037 | session->consumer->relay_major_version = |
1038 | ksess->consumer->relay_major_version; | |
1039 | session->consumer->relay_minor_version = | |
1040 | ksess->consumer->relay_minor_version; | |
2f77fc4b DG |
1041 | } |
1042 | ||
1043 | error: | |
e7fe706f | 1044 | rcu_read_unlock(); |
2f77fc4b DG |
1045 | return ret; |
1046 | } | |
1047 | ||
9b6c7ec5 DG |
1048 | /* |
1049 | * Start a kernel session by opening all necessary streams. | |
1050 | */ | |
1051 | static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe) | |
1052 | { | |
1053 | int ret; | |
1054 | struct ltt_kernel_channel *kchan; | |
1055 | ||
1056 | /* Open kernel metadata */ | |
07b86b52 | 1057 | if (ksess->metadata == NULL && ksess->output_traces) { |
9b6c7ec5 DG |
1058 | ret = kernel_open_metadata(ksess); |
1059 | if (ret < 0) { | |
1060 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1061 | goto error; | |
1062 | } | |
1063 | } | |
1064 | ||
1065 | /* Open kernel metadata stream */ | |
07b86b52 | 1066 | if (ksess->metadata && ksess->metadata_stream_fd < 0) { |
9b6c7ec5 DG |
1067 | ret = kernel_open_metadata_stream(ksess); |
1068 | if (ret < 0) { | |
1069 | ERR("Kernel create metadata stream failed"); | |
1070 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1071 | goto error; | |
1072 | } | |
1073 | } | |
1074 | ||
1075 | /* For each channel */ | |
1076 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
1077 | if (kchan->stream_count == 0) { | |
1078 | ret = kernel_open_channel_stream(kchan); | |
1079 | if (ret < 0) { | |
1080 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1081 | goto error; | |
1082 | } | |
1083 | /* Update the stream global counter */ | |
1084 | ksess->stream_count_global += ret; | |
1085 | } | |
1086 | } | |
1087 | ||
1088 | /* Setup kernel consumer socket and send fds to it */ | |
1089 | ret = init_kernel_tracing(ksess); | |
e43c41c5 | 1090 | if (ret != 0) { |
9b6c7ec5 DG |
1091 | ret = LTTNG_ERR_KERN_START_FAIL; |
1092 | goto error; | |
1093 | } | |
1094 | ||
1095 | /* This start the kernel tracing */ | |
1096 | ret = kernel_start_session(ksess); | |
1097 | if (ret < 0) { | |
1098 | ret = LTTNG_ERR_KERN_START_FAIL; | |
1099 | goto error; | |
1100 | } | |
1101 | ||
1102 | /* Quiescent wait after starting trace */ | |
784303b0 | 1103 | kernel_wait_quiescent(kernel_tracer_fd); |
9b6c7ec5 | 1104 | |
14fb1ebe | 1105 | ksess->active = 1; |
9b6c7ec5 DG |
1106 | |
1107 | ret = LTTNG_OK; | |
1108 | ||
1109 | error: | |
1110 | return ret; | |
1111 | } | |
1112 | ||
2f77fc4b DG |
1113 | /* |
1114 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. | |
1115 | */ | |
56a37563 JG |
1116 | int cmd_disable_channel(struct ltt_session *session, |
1117 | enum lttng_domain_type domain, char *channel_name) | |
2f77fc4b DG |
1118 | { |
1119 | int ret; | |
1120 | struct ltt_ust_session *usess; | |
1121 | ||
1122 | usess = session->ust_session; | |
1123 | ||
2223c96f DG |
1124 | rcu_read_lock(); |
1125 | ||
2f77fc4b DG |
1126 | switch (domain) { |
1127 | case LTTNG_DOMAIN_KERNEL: | |
1128 | { | |
1129 | ret = channel_kernel_disable(session->kernel_session, | |
1130 | channel_name); | |
f73fabfd | 1131 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1132 | goto error; |
1133 | } | |
1134 | ||
1135 | kernel_wait_quiescent(kernel_tracer_fd); | |
1136 | break; | |
1137 | } | |
1138 | case LTTNG_DOMAIN_UST: | |
1139 | { | |
1140 | struct ltt_ust_channel *uchan; | |
1141 | struct lttng_ht *chan_ht; | |
1142 | ||
1143 | chan_ht = usess->domain_global.channels; | |
1144 | ||
1145 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
1146 | if (uchan == NULL) { | |
f73fabfd | 1147 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
1148 | goto error; |
1149 | } | |
1150 | ||
7972aab2 | 1151 | ret = channel_ust_disable(usess, uchan); |
f73fabfd | 1152 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1153 | goto error; |
1154 | } | |
1155 | break; | |
1156 | } | |
2f77fc4b | 1157 | default: |
f73fabfd | 1158 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1159 | goto error; |
1160 | } | |
1161 | ||
f73fabfd | 1162 | ret = LTTNG_OK; |
2f77fc4b DG |
1163 | |
1164 | error: | |
2223c96f | 1165 | rcu_read_unlock(); |
2f77fc4b DG |
1166 | return ret; |
1167 | } | |
1168 | ||
ccf10263 MD |
1169 | /* |
1170 | * Command LTTNG_TRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1171 | * |
1172 | * Called with session lock held. | |
ccf10263 | 1173 | */ |
56a37563 JG |
1174 | int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1175 | int pid) | |
ccf10263 MD |
1176 | { |
1177 | int ret; | |
1178 | ||
1179 | rcu_read_lock(); | |
1180 | ||
1181 | switch (domain) { | |
1182 | case LTTNG_DOMAIN_KERNEL: | |
1183 | { | |
1184 | struct ltt_kernel_session *ksess; | |
1185 | ||
1186 | ksess = session->kernel_session; | |
1187 | ||
1188 | ret = kernel_track_pid(ksess, pid); | |
1189 | if (ret != LTTNG_OK) { | |
1190 | goto error; | |
1191 | } | |
1192 | ||
1193 | kernel_wait_quiescent(kernel_tracer_fd); | |
1194 | break; | |
1195 | } | |
ccf10263 | 1196 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1197 | { |
1198 | struct ltt_ust_session *usess; | |
1199 | ||
1200 | usess = session->ust_session; | |
1201 | ||
1202 | ret = trace_ust_track_pid(usess, pid); | |
1203 | if (ret != LTTNG_OK) { | |
1204 | goto error; | |
1205 | } | |
1206 | break; | |
1207 | } | |
ccf10263 MD |
1208 | default: |
1209 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1210 | goto error; | |
1211 | } | |
1212 | ||
1213 | ret = LTTNG_OK; | |
1214 | ||
1215 | error: | |
1216 | rcu_read_unlock(); | |
1217 | return ret; | |
1218 | } | |
1219 | ||
1220 | /* | |
1221 | * Command LTTNG_UNTRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1222 | * |
1223 | * Called with session lock held. | |
ccf10263 | 1224 | */ |
56a37563 JG |
1225 | int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1226 | int pid) | |
ccf10263 MD |
1227 | { |
1228 | int ret; | |
1229 | ||
1230 | rcu_read_lock(); | |
1231 | ||
1232 | switch (domain) { | |
1233 | case LTTNG_DOMAIN_KERNEL: | |
1234 | { | |
1235 | struct ltt_kernel_session *ksess; | |
1236 | ||
1237 | ksess = session->kernel_session; | |
1238 | ||
1239 | ret = kernel_untrack_pid(ksess, pid); | |
1240 | if (ret != LTTNG_OK) { | |
1241 | goto error; | |
1242 | } | |
1243 | ||
1244 | kernel_wait_quiescent(kernel_tracer_fd); | |
1245 | break; | |
1246 | } | |
ccf10263 | 1247 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1248 | { |
1249 | struct ltt_ust_session *usess; | |
1250 | ||
1251 | usess = session->ust_session; | |
1252 | ||
1253 | ret = trace_ust_untrack_pid(usess, pid); | |
1254 | if (ret != LTTNG_OK) { | |
1255 | goto error; | |
1256 | } | |
1257 | break; | |
1258 | } | |
ccf10263 MD |
1259 | default: |
1260 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1261 | goto error; | |
1262 | } | |
1263 | ||
1264 | ret = LTTNG_OK; | |
1265 | ||
1266 | error: | |
1267 | rcu_read_unlock(); | |
1268 | return ret; | |
1269 | } | |
1270 | ||
2f77fc4b DG |
1271 | /* |
1272 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
1273 | * | |
1274 | * The wpipe arguments is used as a notifier for the kernel thread. | |
1275 | */ | |
1276 | int cmd_enable_channel(struct ltt_session *session, | |
7972aab2 | 1277 | struct lttng_domain *domain, struct lttng_channel *attr, int wpipe) |
2f77fc4b DG |
1278 | { |
1279 | int ret; | |
1280 | struct ltt_ust_session *usess = session->ust_session; | |
1281 | struct lttng_ht *chan_ht; | |
1f345e94 | 1282 | size_t len; |
2f77fc4b DG |
1283 | |
1284 | assert(session); | |
1285 | assert(attr); | |
7972aab2 | 1286 | assert(domain); |
2f77fc4b | 1287 | |
f5436bfc | 1288 | len = lttng_strnlen(attr->name, sizeof(attr->name)); |
1f345e94 PP |
1289 | |
1290 | /* Validate channel name */ | |
1291 | if (attr->name[0] == '.' || | |
1292 | memchr(attr->name, '/', len) != NULL) { | |
1293 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1294 | goto end; | |
1295 | } | |
1296 | ||
2f77fc4b DG |
1297 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
1298 | ||
03b4fdcf DG |
1299 | rcu_read_lock(); |
1300 | ||
ecc48a90 JD |
1301 | /* |
1302 | * Don't try to enable a channel if the session has been started at | |
1303 | * some point in time before. The tracer does not allow it. | |
1304 | */ | |
8382cf6f | 1305 | if (session->has_been_started) { |
ecc48a90 JD |
1306 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
1307 | goto error; | |
1308 | } | |
1309 | ||
1310 | /* | |
1311 | * If the session is a live session, remove the switch timer, the | |
1312 | * live timer does the same thing but sends also synchronisation | |
1313 | * beacons for inactive streams. | |
1314 | */ | |
1315 | if (session->live_timer > 0) { | |
1316 | attr->attr.live_timer_interval = session->live_timer; | |
1317 | attr->attr.switch_timer_interval = 0; | |
1318 | } | |
1319 | ||
33fbd469 DG |
1320 | /* |
1321 | * The ringbuffer (both in user space and kernel) behave badly in overwrite | |
1322 | * mode and with less than 2 subbuf so block it right away and send back an | |
1323 | * invalid attribute error. | |
1324 | */ | |
1325 | if (attr->attr.overwrite && attr->attr.num_subbuf < 2) { | |
1326 | ret = LTTNG_ERR_INVALID; | |
1327 | goto error; | |
1328 | } | |
1329 | ||
7972aab2 | 1330 | switch (domain->type) { |
2f77fc4b DG |
1331 | case LTTNG_DOMAIN_KERNEL: |
1332 | { | |
1333 | struct ltt_kernel_channel *kchan; | |
1334 | ||
2f77fc4b DG |
1335 | kchan = trace_kernel_get_channel_by_name(attr->name, |
1336 | session->kernel_session); | |
1337 | if (kchan == NULL) { | |
1338 | ret = channel_kernel_create(session->kernel_session, attr, wpipe); | |
85076754 MD |
1339 | if (attr->name[0] != '\0') { |
1340 | session->kernel_session->has_non_default_channel = 1; | |
1341 | } | |
2f77fc4b DG |
1342 | } else { |
1343 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
1344 | } | |
1345 | ||
f73fabfd | 1346 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1347 | goto error; |
1348 | } | |
1349 | ||
784303b0 | 1350 | kernel_wait_quiescent(kernel_tracer_fd); |
2f77fc4b DG |
1351 | break; |
1352 | } | |
1353 | case LTTNG_DOMAIN_UST: | |
9232818f JG |
1354 | case LTTNG_DOMAIN_JUL: |
1355 | case LTTNG_DOMAIN_LOG4J: | |
1356 | case LTTNG_DOMAIN_PYTHON: | |
2f77fc4b DG |
1357 | { |
1358 | struct ltt_ust_channel *uchan; | |
1359 | ||
9232818f JG |
1360 | /* |
1361 | * FIXME | |
1362 | * | |
1363 | * Current agent implementation limitations force us to allow | |
1364 | * only one channel at once in "agent" subdomains. Each | |
1365 | * subdomain has a default channel name which must be strictly | |
1366 | * adhered to. | |
1367 | */ | |
1368 | if (domain->type == LTTNG_DOMAIN_JUL) { | |
1369 | if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME, | |
1370 | LTTNG_SYMBOL_NAME_LEN)) { | |
1371 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1372 | goto error; | |
1373 | } | |
1374 | } else if (domain->type == LTTNG_DOMAIN_LOG4J) { | |
1375 | if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME, | |
1376 | LTTNG_SYMBOL_NAME_LEN)) { | |
1377 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1378 | goto error; | |
1379 | } | |
1380 | } else if (domain->type == LTTNG_DOMAIN_PYTHON) { | |
1381 | if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME, | |
1382 | LTTNG_SYMBOL_NAME_LEN)) { | |
1383 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1384 | goto error; | |
1385 | } | |
1386 | } | |
1387 | ||
2f77fc4b DG |
1388 | chan_ht = usess->domain_global.channels; |
1389 | ||
1390 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); | |
1391 | if (uchan == NULL) { | |
7972aab2 | 1392 | ret = channel_ust_create(usess, attr, domain->buf_type); |
85076754 MD |
1393 | if (attr->name[0] != '\0') { |
1394 | usess->has_non_default_channel = 1; | |
1395 | } | |
2f77fc4b | 1396 | } else { |
7972aab2 | 1397 | ret = channel_ust_enable(usess, uchan); |
2f77fc4b DG |
1398 | } |
1399 | break; | |
1400 | } | |
2f77fc4b | 1401 | default: |
f73fabfd | 1402 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1403 | goto error; |
1404 | } | |
1405 | ||
1406 | error: | |
2223c96f | 1407 | rcu_read_unlock(); |
1f345e94 | 1408 | end: |
2f77fc4b DG |
1409 | return ret; |
1410 | } | |
1411 | ||
2f77fc4b DG |
1412 | /* |
1413 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1414 | */ | |
56a37563 JG |
1415 | int cmd_disable_event(struct ltt_session *session, |
1416 | enum lttng_domain_type domain, char *channel_name, | |
6e911cad | 1417 | struct lttng_event *event) |
2f77fc4b DG |
1418 | { |
1419 | int ret; | |
6e911cad MD |
1420 | char *event_name; |
1421 | ||
18a720cd MD |
1422 | DBG("Disable event command for event \'%s\'", event->name); |
1423 | ||
6e911cad | 1424 | event_name = event->name; |
7076b56e JG |
1425 | if (validate_event_name(event_name)) { |
1426 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1427 | goto error; | |
1428 | } | |
6e911cad | 1429 | |
9b7431cf JG |
1430 | /* Error out on unhandled search criteria */ |
1431 | if (event->loglevel_type || event->loglevel != -1 || event->enabled | |
6e911cad | 1432 | || event->pid || event->filter || event->exclusion) { |
7076b56e JG |
1433 | ret = LTTNG_ERR_UNK; |
1434 | goto error; | |
6e911cad | 1435 | } |
2f77fc4b | 1436 | |
2223c96f DG |
1437 | rcu_read_lock(); |
1438 | ||
2f77fc4b DG |
1439 | switch (domain) { |
1440 | case LTTNG_DOMAIN_KERNEL: | |
1441 | { | |
1442 | struct ltt_kernel_channel *kchan; | |
1443 | struct ltt_kernel_session *ksess; | |
1444 | ||
1445 | ksess = session->kernel_session; | |
1446 | ||
85076754 MD |
1447 | /* |
1448 | * If a non-default channel has been created in the | |
1449 | * session, explicitely require that -c chan_name needs | |
1450 | * to be provided. | |
1451 | */ | |
1452 | if (ksess->has_non_default_channel && channel_name[0] == '\0') { | |
1453 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1454 | goto error_unlock; |
85076754 MD |
1455 | } |
1456 | ||
2f77fc4b DG |
1457 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
1458 | if (kchan == NULL) { | |
f73fabfd | 1459 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
7076b56e | 1460 | goto error_unlock; |
2f77fc4b DG |
1461 | } |
1462 | ||
6e911cad MD |
1463 | switch (event->type) { |
1464 | case LTTNG_EVENT_ALL: | |
9550ee81 | 1465 | case LTTNG_EVENT_TRACEPOINT: |
d0ae4ea8 | 1466 | case LTTNG_EVENT_SYSCALL: |
9550ee81 JR |
1467 | case LTTNG_EVENT_PROBE: |
1468 | case LTTNG_EVENT_FUNCTION: | |
1469 | case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */ | |
1470 | if (event_name[0] == '\0') { | |
1471 | ret = event_kernel_disable_event(kchan, | |
1472 | NULL, event->type); | |
29c62722 | 1473 | } else { |
d0ae4ea8 | 1474 | ret = event_kernel_disable_event(kchan, |
9550ee81 | 1475 | event_name, event->type); |
29c62722 | 1476 | } |
6e911cad | 1477 | if (ret != LTTNG_OK) { |
7076b56e | 1478 | goto error_unlock; |
6e911cad MD |
1479 | } |
1480 | break; | |
6e911cad MD |
1481 | default: |
1482 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1483 | goto error_unlock; |
2f77fc4b DG |
1484 | } |
1485 | ||
1486 | kernel_wait_quiescent(kernel_tracer_fd); | |
1487 | break; | |
1488 | } | |
1489 | case LTTNG_DOMAIN_UST: | |
1490 | { | |
1491 | struct ltt_ust_channel *uchan; | |
1492 | struct ltt_ust_session *usess; | |
1493 | ||
1494 | usess = session->ust_session; | |
1495 | ||
7076b56e JG |
1496 | if (validate_ust_event_name(event_name)) { |
1497 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1498 | goto error_unlock; | |
1499 | } | |
1500 | ||
85076754 MD |
1501 | /* |
1502 | * If a non-default channel has been created in the | |
9550ee81 | 1503 | * session, explicitly require that -c chan_name needs |
85076754 MD |
1504 | * to be provided. |
1505 | */ | |
1506 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1507 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1508 | goto error_unlock; |
85076754 MD |
1509 | } |
1510 | ||
2f77fc4b DG |
1511 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
1512 | channel_name); | |
1513 | if (uchan == NULL) { | |
f73fabfd | 1514 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
7076b56e | 1515 | goto error_unlock; |
2f77fc4b DG |
1516 | } |
1517 | ||
6e911cad MD |
1518 | switch (event->type) { |
1519 | case LTTNG_EVENT_ALL: | |
b3639870 JR |
1520 | /* |
1521 | * An empty event name means that everything | |
1522 | * should be disabled. | |
1523 | */ | |
1524 | if (event->name[0] == '\0') { | |
1525 | ret = event_ust_disable_all_tracepoints(usess, uchan); | |
77d536b2 JR |
1526 | } else { |
1527 | ret = event_ust_disable_tracepoint(usess, uchan, | |
1528 | event_name); | |
1529 | } | |
6e911cad | 1530 | if (ret != LTTNG_OK) { |
7076b56e | 1531 | goto error_unlock; |
6e911cad MD |
1532 | } |
1533 | break; | |
1534 | default: | |
1535 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1536 | goto error_unlock; |
2f77fc4b DG |
1537 | } |
1538 | ||
1539 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
1540 | channel_name); | |
1541 | break; | |
1542 | } | |
5cdb6027 | 1543 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1544 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1545 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1546 | { |
fefd409b | 1547 | struct agent *agt; |
f20baf8e DG |
1548 | struct ltt_ust_session *usess = session->ust_session; |
1549 | ||
1550 | assert(usess); | |
1551 | ||
6e911cad MD |
1552 | switch (event->type) { |
1553 | case LTTNG_EVENT_ALL: | |
1554 | break; | |
1555 | default: | |
1556 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1557 | goto error_unlock; |
6e911cad MD |
1558 | } |
1559 | ||
5cdb6027 | 1560 | agt = trace_ust_find_agent(usess, domain); |
fefd409b DG |
1561 | if (!agt) { |
1562 | ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
7076b56e | 1563 | goto error_unlock; |
fefd409b | 1564 | } |
b3639870 JR |
1565 | /* |
1566 | * An empty event name means that everything | |
1567 | * should be disabled. | |
1568 | */ | |
1569 | if (event->name[0] == '\0') { | |
18a720cd MD |
1570 | ret = event_agent_disable_all(usess, agt); |
1571 | } else { | |
1572 | ret = event_agent_disable(usess, agt, event_name); | |
1573 | } | |
f20baf8e | 1574 | if (ret != LTTNG_OK) { |
7076b56e | 1575 | goto error_unlock; |
f20baf8e DG |
1576 | } |
1577 | ||
1578 | break; | |
1579 | } | |
2f77fc4b | 1580 | default: |
f73fabfd | 1581 | ret = LTTNG_ERR_UND; |
7076b56e | 1582 | goto error_unlock; |
2f77fc4b DG |
1583 | } |
1584 | ||
f73fabfd | 1585 | ret = LTTNG_OK; |
2f77fc4b | 1586 | |
7076b56e | 1587 | error_unlock: |
2223c96f | 1588 | rcu_read_unlock(); |
7076b56e | 1589 | error: |
2f77fc4b DG |
1590 | return ret; |
1591 | } | |
1592 | ||
2f77fc4b DG |
1593 | /* |
1594 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1595 | */ | |
56a37563 | 1596 | int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain, |
601d5acf | 1597 | char *channel_name, struct lttng_event_context *ctx, int kwpipe) |
2f77fc4b | 1598 | { |
d5979e4a | 1599 | int ret, chan_kern_created = 0, chan_ust_created = 0; |
bdf64013 JG |
1600 | char *app_ctx_provider_name = NULL, *app_ctx_name = NULL; |
1601 | ||
1602 | if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
1603 | app_ctx_provider_name = ctx->u.app_ctx.provider_name; | |
1604 | app_ctx_name = ctx->u.app_ctx.ctx_name; | |
1605 | } | |
2f77fc4b DG |
1606 | |
1607 | switch (domain) { | |
1608 | case LTTNG_DOMAIN_KERNEL: | |
979e618e DG |
1609 | assert(session->kernel_session); |
1610 | ||
1611 | if (session->kernel_session->channel_count == 0) { | |
1612 | /* Create default channel */ | |
1613 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); | |
1614 | if (ret != LTTNG_OK) { | |
1615 | goto error; | |
1616 | } | |
d5979e4a | 1617 | chan_kern_created = 1; |
979e618e | 1618 | } |
2f77fc4b | 1619 | /* Add kernel context to kernel tracer */ |
601d5acf | 1620 | ret = context_kernel_add(session->kernel_session, ctx, channel_name); |
f73fabfd | 1621 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1622 | goto error; |
1623 | } | |
1624 | break; | |
bdf64013 JG |
1625 | case LTTNG_DOMAIN_JUL: |
1626 | case LTTNG_DOMAIN_LOG4J: | |
1627 | { | |
1628 | /* | |
1629 | * Validate channel name. | |
1630 | * If no channel name is given and the domain is JUL or LOG4J, | |
1631 | * set it to the appropriate domain-specific channel name. If | |
1632 | * a name is provided but does not match the expexted channel | |
1633 | * name, return an error. | |
1634 | */ | |
1635 | if (domain == LTTNG_DOMAIN_JUL && *channel_name && | |
1636 | strcmp(channel_name, | |
1637 | DEFAULT_JUL_CHANNEL_NAME)) { | |
1638 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1639 | goto error; | |
1640 | } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name && | |
1641 | strcmp(channel_name, | |
1642 | DEFAULT_LOG4J_CHANNEL_NAME)) { | |
1643 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1644 | goto error; | |
1645 | } | |
a93b3916 | 1646 | /* break is _not_ missing here. */ |
bdf64013 | 1647 | } |
2f77fc4b DG |
1648 | case LTTNG_DOMAIN_UST: |
1649 | { | |
1650 | struct ltt_ust_session *usess = session->ust_session; | |
85076754 MD |
1651 | unsigned int chan_count; |
1652 | ||
2f77fc4b DG |
1653 | assert(usess); |
1654 | ||
85076754 | 1655 | chan_count = lttng_ht_get_count(usess->domain_global.channels); |
979e618e DG |
1656 | if (chan_count == 0) { |
1657 | struct lttng_channel *attr; | |
1658 | /* Create default channel */ | |
0a9c6494 | 1659 | attr = channel_new_default_attr(domain, usess->buffer_type); |
979e618e DG |
1660 | if (attr == NULL) { |
1661 | ret = LTTNG_ERR_FATAL; | |
1662 | goto error; | |
1663 | } | |
1664 | ||
7972aab2 | 1665 | ret = channel_ust_create(usess, attr, usess->buffer_type); |
979e618e DG |
1666 | if (ret != LTTNG_OK) { |
1667 | free(attr); | |
1668 | goto error; | |
1669 | } | |
1670 | free(attr); | |
d5979e4a | 1671 | chan_ust_created = 1; |
979e618e DG |
1672 | } |
1673 | ||
601d5acf | 1674 | ret = context_ust_add(usess, domain, ctx, channel_name); |
bdf64013 JG |
1675 | free(app_ctx_provider_name); |
1676 | free(app_ctx_name); | |
1677 | app_ctx_name = NULL; | |
1678 | app_ctx_provider_name = NULL; | |
f73fabfd | 1679 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1680 | goto error; |
1681 | } | |
1682 | break; | |
1683 | } | |
2f77fc4b | 1684 | default: |
f73fabfd | 1685 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1686 | goto error; |
1687 | } | |
1688 | ||
bdf64013 JG |
1689 | ret = LTTNG_OK; |
1690 | goto end; | |
2f77fc4b DG |
1691 | |
1692 | error: | |
d5979e4a DG |
1693 | if (chan_kern_created) { |
1694 | struct ltt_kernel_channel *kchan = | |
1695 | trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME, | |
1696 | session->kernel_session); | |
1697 | /* Created previously, this should NOT fail. */ | |
1698 | assert(kchan); | |
1699 | kernel_destroy_channel(kchan); | |
1700 | } | |
1701 | ||
1702 | if (chan_ust_created) { | |
1703 | struct ltt_ust_channel *uchan = | |
1704 | trace_ust_find_channel_by_name( | |
1705 | session->ust_session->domain_global.channels, | |
1706 | DEFAULT_CHANNEL_NAME); | |
1707 | /* Created previously, this should NOT fail. */ | |
1708 | assert(uchan); | |
1709 | /* Remove from the channel list of the session. */ | |
1710 | trace_ust_delete_channel(session->ust_session->domain_global.channels, | |
1711 | uchan); | |
1712 | trace_ust_destroy_channel(uchan); | |
1713 | } | |
bdf64013 JG |
1714 | end: |
1715 | free(app_ctx_provider_name); | |
1716 | free(app_ctx_name); | |
2f77fc4b DG |
1717 | return ret; |
1718 | } | |
1719 | ||
930a2e99 JG |
1720 | static int validate_event_name(const char *name) |
1721 | { | |
1722 | int ret = 0; | |
1723 | const char *c = name; | |
1724 | const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN; | |
bf9807db | 1725 | bool null_terminated = false; |
930a2e99 JG |
1726 | |
1727 | /* | |
1728 | * Make sure that unescaped wildcards are only used as the last | |
1729 | * character of the event name. | |
1730 | */ | |
1731 | while (c < event_name_end) { | |
1732 | switch (*c) { | |
1733 | case '\0': | |
bf9807db | 1734 | null_terminated = true; |
930a2e99 JG |
1735 | goto end; |
1736 | case '\\': | |
1737 | c++; | |
1738 | break; | |
1739 | case '*': | |
1740 | if ((c + 1) < event_name_end && *(c + 1)) { | |
1741 | /* Wildcard is not the last character */ | |
1742 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1743 | goto end; | |
1744 | } | |
1745 | default: | |
1746 | break; | |
1747 | } | |
1748 | c++; | |
1749 | } | |
1750 | end: | |
bf9807db JG |
1751 | if (!ret && !null_terminated) { |
1752 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1753 | } | |
930a2e99 JG |
1754 | return ret; |
1755 | } | |
1756 | ||
dac8e046 JG |
1757 | static inline bool name_starts_with(const char *name, const char *prefix) |
1758 | { | |
1759 | const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN); | |
1760 | ||
1761 | return !strncmp(name, prefix, max_cmp_len); | |
1762 | } | |
1763 | ||
1764 | /* Perform userspace-specific event name validation */ | |
1765 | static int validate_ust_event_name(const char *name) | |
1766 | { | |
1767 | int ret = 0; | |
1768 | ||
1769 | if (!name) { | |
1770 | ret = -1; | |
1771 | goto end; | |
1772 | } | |
1773 | ||
1774 | /* | |
1775 | * Check name against all internal UST event component namespaces used | |
1776 | * by the agents. | |
1777 | */ | |
1778 | if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) || | |
1779 | name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) || | |
1780 | name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) { | |
1781 | ret = -1; | |
1782 | } | |
1783 | ||
1784 | end: | |
1785 | return ret; | |
1786 | } | |
88f06f15 | 1787 | |
2f77fc4b | 1788 | /* |
88f06f15 JG |
1789 | * Internal version of cmd_enable_event() with a supplemental |
1790 | * "internal_event" flag which is used to enable internal events which should | |
1791 | * be hidden from clients. Such events are used in the agent implementation to | |
1792 | * enable the events through which all "agent" events are funeled. | |
2f77fc4b | 1793 | */ |
88f06f15 JG |
1794 | static int _cmd_enable_event(struct ltt_session *session, |
1795 | struct lttng_domain *domain, | |
025faf73 | 1796 | char *channel_name, struct lttng_event *event, |
6b453b5e | 1797 | char *filter_expression, |
db8f1377 JI |
1798 | struct lttng_filter_bytecode *filter, |
1799 | struct lttng_event_exclusion *exclusion, | |
88f06f15 | 1800 | int wpipe, bool internal_event) |
2f77fc4b | 1801 | { |
e5f5db7f | 1802 | int ret, channel_created = 0; |
2f77fc4b DG |
1803 | struct lttng_channel *attr; |
1804 | ||
1805 | assert(session); | |
1806 | assert(event); | |
1807 | assert(channel_name); | |
1808 | ||
2a385866 JG |
1809 | /* If we have a filter, we must have its filter expression */ |
1810 | assert(!(!!filter_expression ^ !!filter)); | |
1811 | ||
18a720cd MD |
1812 | DBG("Enable event command for event \'%s\'", event->name); |
1813 | ||
f5ac4bd7 MD |
1814 | rcu_read_lock(); |
1815 | ||
930a2e99 JG |
1816 | ret = validate_event_name(event->name); |
1817 | if (ret) { | |
1818 | goto error; | |
1819 | } | |
1820 | ||
7972aab2 | 1821 | switch (domain->type) { |
2f77fc4b DG |
1822 | case LTTNG_DOMAIN_KERNEL: |
1823 | { | |
1824 | struct ltt_kernel_channel *kchan; | |
1825 | ||
85076754 MD |
1826 | /* |
1827 | * If a non-default channel has been created in the | |
1828 | * session, explicitely require that -c chan_name needs | |
1829 | * to be provided. | |
1830 | */ | |
1831 | if (session->kernel_session->has_non_default_channel | |
1832 | && channel_name[0] == '\0') { | |
1833 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1834 | goto error; | |
1835 | } | |
1836 | ||
2f77fc4b DG |
1837 | kchan = trace_kernel_get_channel_by_name(channel_name, |
1838 | session->kernel_session); | |
1839 | if (kchan == NULL) { | |
0a9c6494 DG |
1840 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
1841 | LTTNG_BUFFER_GLOBAL); | |
2f77fc4b | 1842 | if (attr == NULL) { |
f73fabfd | 1843 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1844 | goto error; |
1845 | } | |
1846 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1847 | ||
1848 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1849 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1850 | free(attr); |
1851 | goto error; | |
1852 | } | |
1853 | free(attr); | |
e5f5db7f DG |
1854 | |
1855 | channel_created = 1; | |
2f77fc4b DG |
1856 | } |
1857 | ||
1858 | /* Get the newly created kernel channel pointer */ | |
1859 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1860 | session->kernel_session); | |
1861 | if (kchan == NULL) { | |
1862 | /* This sould not happen... */ | |
f73fabfd | 1863 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1864 | goto error; |
1865 | } | |
1866 | ||
6e911cad MD |
1867 | switch (event->type) { |
1868 | case LTTNG_EVENT_ALL: | |
29c62722 | 1869 | { |
00a62084 MD |
1870 | char *filter_expression_a = NULL; |
1871 | struct lttng_filter_bytecode *filter_a = NULL; | |
1872 | ||
1873 | /* | |
1874 | * We need to duplicate filter_expression and filter, | |
1875 | * because ownership is passed to first enable | |
1876 | * event. | |
1877 | */ | |
1878 | if (filter_expression) { | |
1879 | filter_expression_a = strdup(filter_expression); | |
1880 | if (!filter_expression_a) { | |
1881 | ret = LTTNG_ERR_FATAL; | |
1882 | goto error; | |
1883 | } | |
1884 | } | |
1885 | if (filter) { | |
1886 | filter_a = zmalloc(sizeof(*filter_a) + filter->len); | |
1887 | if (!filter_a) { | |
1888 | free(filter_expression_a); | |
1889 | ret = LTTNG_ERR_FATAL; | |
1890 | goto error; | |
1891 | } | |
1892 | memcpy(filter_a, filter, sizeof(*filter_a) + filter->len); | |
1893 | } | |
29c62722 | 1894 | event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */ |
00a62084 MD |
1895 | ret = event_kernel_enable_event(kchan, event, |
1896 | filter_expression, filter); | |
a969e101 MD |
1897 | /* We have passed ownership */ |
1898 | filter_expression = NULL; | |
1899 | filter = NULL; | |
29c62722 MD |
1900 | if (ret != LTTNG_OK) { |
1901 | if (channel_created) { | |
1902 | /* Let's not leak a useless channel. */ | |
1903 | kernel_destroy_channel(kchan); | |
1904 | } | |
00a62084 MD |
1905 | free(filter_expression_a); |
1906 | free(filter_a); | |
29c62722 MD |
1907 | goto error; |
1908 | } | |
1909 | event->type = LTTNG_EVENT_SYSCALL; /* Hack */ | |
00a62084 MD |
1910 | ret = event_kernel_enable_event(kchan, event, |
1911 | filter_expression_a, filter_a); | |
60d21fa2 AB |
1912 | /* We have passed ownership */ |
1913 | filter_expression_a = NULL; | |
1914 | filter_a = NULL; | |
29c62722 MD |
1915 | if (ret != LTTNG_OK) { |
1916 | goto error; | |
1917 | } | |
1918 | break; | |
1919 | } | |
6e6ef3d7 DG |
1920 | case LTTNG_EVENT_PROBE: |
1921 | case LTTNG_EVENT_FUNCTION: | |
1922 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
6e911cad | 1923 | case LTTNG_EVENT_TRACEPOINT: |
00a62084 MD |
1924 | ret = event_kernel_enable_event(kchan, event, |
1925 | filter_expression, filter); | |
a969e101 MD |
1926 | /* We have passed ownership */ |
1927 | filter_expression = NULL; | |
1928 | filter = NULL; | |
6e911cad MD |
1929 | if (ret != LTTNG_OK) { |
1930 | if (channel_created) { | |
1931 | /* Let's not leak a useless channel. */ | |
1932 | kernel_destroy_channel(kchan); | |
1933 | } | |
1934 | goto error; | |
e5f5db7f | 1935 | } |
6e911cad MD |
1936 | break; |
1937 | case LTTNG_EVENT_SYSCALL: | |
00a62084 MD |
1938 | ret = event_kernel_enable_event(kchan, event, |
1939 | filter_expression, filter); | |
a969e101 MD |
1940 | /* We have passed ownership */ |
1941 | filter_expression = NULL; | |
1942 | filter = NULL; | |
e2b957af MD |
1943 | if (ret != LTTNG_OK) { |
1944 | goto error; | |
1945 | } | |
6e911cad MD |
1946 | break; |
1947 | default: | |
1948 | ret = LTTNG_ERR_UNK; | |
2f77fc4b DG |
1949 | goto error; |
1950 | } | |
1951 | ||
1952 | kernel_wait_quiescent(kernel_tracer_fd); | |
1953 | break; | |
1954 | } | |
1955 | case LTTNG_DOMAIN_UST: | |
1956 | { | |
1957 | struct ltt_ust_channel *uchan; | |
1958 | struct ltt_ust_session *usess = session->ust_session; | |
1959 | ||
1960 | assert(usess); | |
1961 | ||
85076754 MD |
1962 | /* |
1963 | * If a non-default channel has been created in the | |
1964 | * session, explicitely require that -c chan_name needs | |
1965 | * to be provided. | |
1966 | */ | |
1967 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1968 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1969 | goto error; | |
1970 | } | |
1971 | ||
2f77fc4b DG |
1972 | /* Get channel from global UST domain */ |
1973 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
1974 | channel_name); | |
1975 | if (uchan == NULL) { | |
1976 | /* Create default channel */ | |
0a9c6494 DG |
1977 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
1978 | usess->buffer_type); | |
2f77fc4b | 1979 | if (attr == NULL) { |
f73fabfd | 1980 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1981 | goto error; |
1982 | } | |
1983 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1984 | ||
1985 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1986 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1987 | free(attr); |
1988 | goto error; | |
1989 | } | |
1990 | free(attr); | |
1991 | ||
1992 | /* Get the newly created channel reference back */ | |
1993 | uchan = trace_ust_find_channel_by_name( | |
1994 | usess->domain_global.channels, channel_name); | |
1995 | assert(uchan); | |
1996 | } | |
1997 | ||
141feb8c JG |
1998 | if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) { |
1999 | /* | |
2000 | * Don't allow users to add UST events to channels which | |
2001 | * are assigned to a userspace subdomain (JUL, Log4J, | |
2002 | * Python, etc.). | |
2003 | */ | |
2004 | ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN; | |
2005 | goto error; | |
2006 | } | |
2007 | ||
dac8e046 JG |
2008 | if (!internal_event) { |
2009 | /* | |
2010 | * Ensure the event name is not reserved for internal | |
2011 | * use. | |
2012 | */ | |
2013 | ret = validate_ust_event_name(event->name); | |
2014 | if (ret) { | |
2015 | WARN("Userspace event name %s failed validation.", | |
2016 | event->name ? | |
2017 | event->name : "NULL"); | |
2018 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
2019 | goto error; | |
2020 | } | |
2021 | } | |
2022 | ||
2f77fc4b | 2023 | /* At this point, the session and channel exist on the tracer */ |
6b453b5e | 2024 | ret = event_ust_enable_tracepoint(usess, uchan, event, |
88f06f15 JG |
2025 | filter_expression, filter, exclusion, |
2026 | internal_event); | |
49d21f93 MD |
2027 | /* We have passed ownership */ |
2028 | filter_expression = NULL; | |
2029 | filter = NULL; | |
2030 | exclusion = NULL; | |
94382e15 JG |
2031 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2032 | goto already_enabled; | |
2033 | } else if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2034 | goto error; |
2035 | } | |
2036 | break; | |
2037 | } | |
5cdb6027 | 2038 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 2039 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2040 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 2041 | { |
da6c3a50 | 2042 | const char *default_event_name, *default_chan_name; |
fefd409b | 2043 | struct agent *agt; |
f20baf8e DG |
2044 | struct lttng_event uevent; |
2045 | struct lttng_domain tmp_dom; | |
2046 | struct ltt_ust_session *usess = session->ust_session; | |
2047 | ||
2048 | assert(usess); | |
2049 | ||
5cdb6027 | 2050 | agt = trace_ust_find_agent(usess, domain->type); |
fefd409b | 2051 | if (!agt) { |
5cdb6027 | 2052 | agt = agent_create(domain->type); |
fefd409b | 2053 | if (!agt) { |
e5b3c48c | 2054 | ret = LTTNG_ERR_NOMEM; |
fefd409b DG |
2055 | goto error; |
2056 | } | |
2057 | agent_add(agt, usess->agents); | |
2058 | } | |
2059 | ||
022d91ba | 2060 | /* Create the default tracepoint. */ |
996de3c7 | 2061 | memset(&uevent, 0, sizeof(uevent)); |
f20baf8e DG |
2062 | uevent.type = LTTNG_EVENT_TRACEPOINT; |
2063 | uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
51755dc8 JG |
2064 | default_event_name = event_get_default_agent_ust_name( |
2065 | domain->type); | |
da6c3a50 | 2066 | if (!default_event_name) { |
e5b3c48c | 2067 | ret = LTTNG_ERR_FATAL; |
da6c3a50 | 2068 | goto error; |
f43f95a9 | 2069 | } |
da6c3a50 | 2070 | strncpy(uevent.name, default_event_name, sizeof(uevent.name)); |
f20baf8e DG |
2071 | uevent.name[sizeof(uevent.name) - 1] = '\0'; |
2072 | ||
2073 | /* | |
2074 | * The domain type is changed because we are about to enable the | |
2075 | * default channel and event for the JUL domain that are hardcoded. | |
2076 | * This happens in the UST domain. | |
2077 | */ | |
2078 | memcpy(&tmp_dom, domain, sizeof(tmp_dom)); | |
2079 | tmp_dom.type = LTTNG_DOMAIN_UST; | |
2080 | ||
0e115563 DG |
2081 | switch (domain->type) { |
2082 | case LTTNG_DOMAIN_LOG4J: | |
da6c3a50 | 2083 | default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME; |
0e115563 DG |
2084 | break; |
2085 | case LTTNG_DOMAIN_JUL: | |
da6c3a50 | 2086 | default_chan_name = DEFAULT_JUL_CHANNEL_NAME; |
0e115563 DG |
2087 | break; |
2088 | case LTTNG_DOMAIN_PYTHON: | |
2089 | default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
2090 | break; | |
2091 | default: | |
e98a44b0 | 2092 | /* The switch/case we are in makes this impossible */ |
0e115563 | 2093 | assert(0); |
da6c3a50 DG |
2094 | } |
2095 | ||
971da06a | 2096 | { |
8404118c | 2097 | char *filter_expression_copy = NULL; |
51755dc8 | 2098 | struct lttng_filter_bytecode *filter_copy = NULL; |
971da06a JG |
2099 | |
2100 | if (filter) { | |
51755dc8 JG |
2101 | const size_t filter_size = sizeof( |
2102 | struct lttng_filter_bytecode) | |
2103 | + filter->len; | |
2104 | ||
2105 | filter_copy = zmalloc(filter_size); | |
971da06a | 2106 | if (!filter_copy) { |
018096a4 | 2107 | ret = LTTNG_ERR_NOMEM; |
b742e3e2 | 2108 | goto error; |
971da06a | 2109 | } |
51755dc8 | 2110 | memcpy(filter_copy, filter, filter_size); |
971da06a | 2111 | |
8404118c JG |
2112 | filter_expression_copy = |
2113 | strdup(filter_expression); | |
2114 | if (!filter_expression) { | |
2115 | ret = LTTNG_ERR_NOMEM; | |
51755dc8 JG |
2116 | } |
2117 | ||
2118 | if (!filter_expression_copy || !filter_copy) { | |
2119 | free(filter_expression_copy); | |
2120 | free(filter_copy); | |
2121 | goto error; | |
8404118c | 2122 | } |
971da06a JG |
2123 | } |
2124 | ||
88f06f15 | 2125 | ret = cmd_enable_event_internal(session, &tmp_dom, |
971da06a | 2126 | (char *) default_chan_name, |
8404118c JG |
2127 | &uevent, filter_expression_copy, |
2128 | filter_copy, NULL, wpipe); | |
971da06a JG |
2129 | } |
2130 | ||
94382e15 JG |
2131 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2132 | goto already_enabled; | |
2133 | } else if (ret != LTTNG_OK) { | |
f20baf8e DG |
2134 | goto error; |
2135 | } | |
2136 | ||
2137 | /* The wild card * means that everything should be enabled. */ | |
2138 | if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) { | |
8404118c JG |
2139 | ret = event_agent_enable_all(usess, agt, event, filter, |
2140 | filter_expression); | |
f20baf8e | 2141 | } else { |
8404118c JG |
2142 | ret = event_agent_enable(usess, agt, event, filter, |
2143 | filter_expression); | |
f20baf8e | 2144 | } |
51755dc8 JG |
2145 | filter = NULL; |
2146 | filter_expression = NULL; | |
f20baf8e DG |
2147 | if (ret != LTTNG_OK) { |
2148 | goto error; | |
2149 | } | |
2150 | ||
2151 | break; | |
2152 | } | |
2f77fc4b | 2153 | default: |
f73fabfd | 2154 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2155 | goto error; |
2156 | } | |
2157 | ||
f73fabfd | 2158 | ret = LTTNG_OK; |
2f77fc4b | 2159 | |
94382e15 | 2160 | already_enabled: |
2f77fc4b | 2161 | error: |
49d21f93 MD |
2162 | free(filter_expression); |
2163 | free(filter); | |
2164 | free(exclusion); | |
2223c96f | 2165 | rcu_read_unlock(); |
2f77fc4b DG |
2166 | return ret; |
2167 | } | |
2168 | ||
88f06f15 JG |
2169 | /* |
2170 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2171 | * We own filter, exclusion, and filter_expression. | |
2172 | */ | |
2173 | int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain, | |
2174 | char *channel_name, struct lttng_event *event, | |
2175 | char *filter_expression, | |
2176 | struct lttng_filter_bytecode *filter, | |
2177 | struct lttng_event_exclusion *exclusion, | |
2178 | int wpipe) | |
2179 | { | |
2180 | return _cmd_enable_event(session, domain, channel_name, event, | |
2181 | filter_expression, filter, exclusion, wpipe, false); | |
2182 | } | |
2183 | ||
2184 | /* | |
2185 | * Enable an event which is internal to LTTng. An internal should | |
2186 | * never be made visible to clients and are immune to checks such as | |
2187 | * reserved names. | |
2188 | */ | |
2189 | static int cmd_enable_event_internal(struct ltt_session *session, | |
2190 | struct lttng_domain *domain, | |
2191 | char *channel_name, struct lttng_event *event, | |
2192 | char *filter_expression, | |
2193 | struct lttng_filter_bytecode *filter, | |
2194 | struct lttng_event_exclusion *exclusion, | |
2195 | int wpipe) | |
2196 | { | |
2197 | return _cmd_enable_event(session, domain, channel_name, event, | |
2198 | filter_expression, filter, exclusion, wpipe, true); | |
2199 | } | |
2200 | ||
2f77fc4b DG |
2201 | /* |
2202 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2203 | */ | |
56a37563 JG |
2204 | ssize_t cmd_list_tracepoints(enum lttng_domain_type domain, |
2205 | struct lttng_event **events) | |
2f77fc4b DG |
2206 | { |
2207 | int ret; | |
2208 | ssize_t nb_events = 0; | |
2209 | ||
2210 | switch (domain) { | |
2211 | case LTTNG_DOMAIN_KERNEL: | |
2212 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2213 | if (nb_events < 0) { | |
f73fabfd | 2214 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
2f77fc4b DG |
2215 | goto error; |
2216 | } | |
2217 | break; | |
2218 | case LTTNG_DOMAIN_UST: | |
2219 | nb_events = ust_app_list_events(events); | |
2220 | if (nb_events < 0) { | |
f73fabfd | 2221 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2222 | goto error; |
2223 | } | |
2224 | break; | |
5cdb6027 | 2225 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2226 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2227 | case LTTNG_DOMAIN_PYTHON: |
f60140a1 | 2228 | nb_events = agent_list_events(events, domain); |
3c6a091f DG |
2229 | if (nb_events < 0) { |
2230 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2231 | goto error; | |
2232 | } | |
2233 | break; | |
2f77fc4b | 2234 | default: |
f73fabfd | 2235 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2236 | goto error; |
2237 | } | |
2238 | ||
2239 | return nb_events; | |
2240 | ||
2241 | error: | |
2242 | /* Return negative value to differentiate return code */ | |
2243 | return -ret; | |
2244 | } | |
2245 | ||
2246 | /* | |
2247 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
2248 | */ | |
56a37563 | 2249 | ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain, |
2f77fc4b DG |
2250 | struct lttng_event_field **fields) |
2251 | { | |
2252 | int ret; | |
2253 | ssize_t nb_fields = 0; | |
2254 | ||
2255 | switch (domain) { | |
2256 | case LTTNG_DOMAIN_UST: | |
2257 | nb_fields = ust_app_list_event_fields(fields); | |
2258 | if (nb_fields < 0) { | |
f73fabfd | 2259 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2260 | goto error; |
2261 | } | |
2262 | break; | |
2263 | case LTTNG_DOMAIN_KERNEL: | |
2264 | default: /* fall-through */ | |
f73fabfd | 2265 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2266 | goto error; |
2267 | } | |
2268 | ||
2269 | return nb_fields; | |
2270 | ||
2271 | error: | |
2272 | /* Return negative value to differentiate return code */ | |
2273 | return -ret; | |
2274 | } | |
2275 | ||
834978fd DG |
2276 | ssize_t cmd_list_syscalls(struct lttng_event **events) |
2277 | { | |
2278 | return syscall_table_list(events); | |
2279 | } | |
2280 | ||
a5dfbb9d MD |
2281 | /* |
2282 | * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread. | |
2283 | * | |
2284 | * Called with session lock held. | |
2285 | */ | |
2286 | ssize_t cmd_list_tracker_pids(struct ltt_session *session, | |
56a37563 | 2287 | enum lttng_domain_type domain, int32_t **pids) |
a5dfbb9d MD |
2288 | { |
2289 | int ret; | |
2290 | ssize_t nr_pids = 0; | |
2291 | ||
2292 | switch (domain) { | |
2293 | case LTTNG_DOMAIN_KERNEL: | |
2294 | { | |
2295 | struct ltt_kernel_session *ksess; | |
2296 | ||
2297 | ksess = session->kernel_session; | |
2298 | nr_pids = kernel_list_tracker_pids(ksess, pids); | |
2299 | if (nr_pids < 0) { | |
2300 | ret = LTTNG_ERR_KERN_LIST_FAIL; | |
2301 | goto error; | |
2302 | } | |
2303 | break; | |
2304 | } | |
2305 | case LTTNG_DOMAIN_UST: | |
2306 | { | |
2307 | struct ltt_ust_session *usess; | |
2308 | ||
2309 | usess = session->ust_session; | |
2310 | nr_pids = trace_ust_list_tracker_pids(usess, pids); | |
2311 | if (nr_pids < 0) { | |
2312 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2313 | goto error; | |
2314 | } | |
2315 | break; | |
2316 | } | |
2317 | case LTTNG_DOMAIN_LOG4J: | |
2318 | case LTTNG_DOMAIN_JUL: | |
2319 | case LTTNG_DOMAIN_PYTHON: | |
2320 | default: | |
2321 | ret = LTTNG_ERR_UND; | |
2322 | goto error; | |
2323 | } | |
2324 | ||
2325 | return nr_pids; | |
2326 | ||
2327 | error: | |
2328 | /* Return negative value to differentiate return code */ | |
2329 | return -ret; | |
2330 | } | |
2331 | ||
2f77fc4b DG |
2332 | /* |
2333 | * Command LTTNG_START_TRACE processed by the client thread. | |
a9ad0c8f MD |
2334 | * |
2335 | * Called with session mutex held. | |
2f77fc4b DG |
2336 | */ |
2337 | int cmd_start_trace(struct ltt_session *session) | |
2338 | { | |
2339 | int ret; | |
cde3e505 | 2340 | unsigned long nb_chan = 0; |
2f77fc4b DG |
2341 | struct ltt_kernel_session *ksession; |
2342 | struct ltt_ust_session *usess; | |
2f77fc4b DG |
2343 | |
2344 | assert(session); | |
2345 | ||
2346 | /* Ease our life a bit ;) */ | |
2347 | ksession = session->kernel_session; | |
2348 | usess = session->ust_session; | |
2349 | ||
8382cf6f DG |
2350 | /* Is the session already started? */ |
2351 | if (session->active) { | |
f73fabfd | 2352 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2353 | goto error; |
2354 | } | |
2355 | ||
cde3e505 DG |
2356 | /* |
2357 | * Starting a session without channel is useless since after that it's not | |
2358 | * possible to enable channel thus inform the client. | |
2359 | */ | |
2360 | if (usess && usess->domain_global.channels) { | |
2361 | nb_chan += lttng_ht_get_count(usess->domain_global.channels); | |
2362 | } | |
2363 | if (ksession) { | |
2364 | nb_chan += ksession->channel_count; | |
2365 | } | |
2366 | if (!nb_chan) { | |
2367 | ret = LTTNG_ERR_NO_CHANNEL; | |
2368 | goto error; | |
2369 | } | |
2370 | ||
2f77fc4b DG |
2371 | /* Kernel tracing */ |
2372 | if (ksession != NULL) { | |
9b6c7ec5 DG |
2373 | ret = start_kernel_session(ksession, kernel_tracer_fd); |
2374 | if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2375 | goto error; |
2376 | } | |
2f77fc4b DG |
2377 | } |
2378 | ||
2379 | /* Flag session that trace should start automatically */ | |
2380 | if (usess) { | |
14fb1ebe DG |
2381 | /* |
2382 | * Even though the start trace might fail, flag this session active so | |
2383 | * other application coming in are started by default. | |
2384 | */ | |
2385 | usess->active = 1; | |
2f77fc4b DG |
2386 | |
2387 | ret = ust_app_start_trace_all(usess); | |
2388 | if (ret < 0) { | |
f73fabfd | 2389 | ret = LTTNG_ERR_UST_START_FAIL; |
2f77fc4b DG |
2390 | goto error; |
2391 | } | |
2392 | } | |
2393 | ||
8382cf6f DG |
2394 | /* Flag this after a successful start. */ |
2395 | session->has_been_started = 1; | |
2396 | session->active = 1; | |
9b6c7ec5 | 2397 | |
f73fabfd | 2398 | ret = LTTNG_OK; |
2f77fc4b DG |
2399 | |
2400 | error: | |
2401 | return ret; | |
2402 | } | |
2403 | ||
2404 | /* | |
2405 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2406 | */ | |
2407 | int cmd_stop_trace(struct ltt_session *session) | |
2408 | { | |
2409 | int ret; | |
2410 | struct ltt_kernel_channel *kchan; | |
2411 | struct ltt_kernel_session *ksession; | |
2412 | struct ltt_ust_session *usess; | |
2413 | ||
2414 | assert(session); | |
2415 | ||
2416 | /* Short cut */ | |
2417 | ksession = session->kernel_session; | |
2418 | usess = session->ust_session; | |
2419 | ||
8382cf6f DG |
2420 | /* Session is not active. Skip everythong and inform the client. */ |
2421 | if (!session->active) { | |
f73fabfd | 2422 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
2f77fc4b DG |
2423 | goto error; |
2424 | } | |
2425 | ||
2f77fc4b | 2426 | /* Kernel tracer */ |
14fb1ebe | 2427 | if (ksession && ksession->active) { |
2f77fc4b DG |
2428 | DBG("Stop kernel tracing"); |
2429 | ||
2430 | /* Flush metadata if exist */ | |
2431 | if (ksession->metadata_stream_fd >= 0) { | |
2432 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2433 | if (ret < 0) { | |
2434 | ERR("Kernel metadata flush failed"); | |
2435 | } | |
2436 | } | |
2437 | ||
2438 | /* Flush all buffers before stopping */ | |
2439 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2440 | ret = kernel_flush_buffer(kchan); | |
2441 | if (ret < 0) { | |
2442 | ERR("Kernel flush buffer error"); | |
2443 | } | |
2444 | } | |
2445 | ||
2446 | ret = kernel_stop_session(ksession); | |
2447 | if (ret < 0) { | |
f73fabfd | 2448 | ret = LTTNG_ERR_KERN_STOP_FAIL; |
2f77fc4b DG |
2449 | goto error; |
2450 | } | |
2451 | ||
2452 | kernel_wait_quiescent(kernel_tracer_fd); | |
9b6c7ec5 | 2453 | |
14fb1ebe | 2454 | ksession->active = 0; |
2f77fc4b DG |
2455 | } |
2456 | ||
14fb1ebe DG |
2457 | if (usess && usess->active) { |
2458 | /* | |
2459 | * Even though the stop trace might fail, flag this session inactive so | |
2460 | * other application coming in are not started by default. | |
2461 | */ | |
2462 | usess->active = 0; | |
2f77fc4b DG |
2463 | |
2464 | ret = ust_app_stop_trace_all(usess); | |
2465 | if (ret < 0) { | |
f73fabfd | 2466 | ret = LTTNG_ERR_UST_STOP_FAIL; |
2f77fc4b DG |
2467 | goto error; |
2468 | } | |
2469 | } | |
2470 | ||
8382cf6f DG |
2471 | /* Flag inactive after a successful stop. */ |
2472 | session->active = 0; | |
f73fabfd | 2473 | ret = LTTNG_OK; |
2f77fc4b DG |
2474 | |
2475 | error: | |
2476 | return ret; | |
2477 | } | |
2478 | ||
2479 | /* | |
2480 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
2481 | */ | |
bda32d56 JG |
2482 | int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri, |
2483 | struct lttng_uri *uris) | |
2f77fc4b DG |
2484 | { |
2485 | int ret, i; | |
2486 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2487 | struct ltt_ust_session *usess = session->ust_session; | |
2f77fc4b DG |
2488 | |
2489 | assert(session); | |
2490 | assert(uris); | |
2491 | assert(nb_uri > 0); | |
2492 | ||
8382cf6f DG |
2493 | /* Can't set consumer URI if the session is active. */ |
2494 | if (session->active) { | |
f73fabfd | 2495 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2496 | goto error; |
2497 | } | |
2498 | ||
bda32d56 | 2499 | /* Set the "global" consumer URIs */ |
2f77fc4b | 2500 | for (i = 0; i < nb_uri; i++) { |
bda32d56 JG |
2501 | ret = add_uri_to_consumer(session->consumer, |
2502 | &uris[i], 0, session->name); | |
a74934ba | 2503 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2504 | goto error; |
2505 | } | |
2f77fc4b DG |
2506 | } |
2507 | ||
bda32d56 JG |
2508 | /* Set UST session URIs */ |
2509 | if (session->ust_session) { | |
2510 | for (i = 0; i < nb_uri; i++) { | |
2511 | ret = add_uri_to_consumer( | |
2512 | session->ust_session->consumer, | |
2513 | &uris[i], LTTNG_DOMAIN_UST, | |
2514 | session->name); | |
2515 | if (ret != LTTNG_OK) { | |
2516 | goto error; | |
2517 | } | |
2518 | } | |
2519 | } | |
2520 | ||
2521 | /* Set kernel session URIs */ | |
2522 | if (session->kernel_session) { | |
2523 | for (i = 0; i < nb_uri; i++) { | |
2524 | ret = add_uri_to_consumer( | |
2525 | session->kernel_session->consumer, | |
2526 | &uris[i], LTTNG_DOMAIN_KERNEL, | |
2527 | session->name); | |
2528 | if (ret != LTTNG_OK) { | |
2529 | goto error; | |
2530 | } | |
2531 | } | |
2532 | } | |
2533 | ||
7ab70fe0 DG |
2534 | /* |
2535 | * Make sure to set the session in output mode after we set URI since a | |
2536 | * session can be created without URL (thus flagged in no output mode). | |
2537 | */ | |
2538 | session->output_traces = 1; | |
2539 | if (ksess) { | |
2540 | ksess->output_traces = 1; | |
bda32d56 JG |
2541 | } |
2542 | ||
2543 | if (usess) { | |
7ab70fe0 DG |
2544 | usess->output_traces = 1; |
2545 | } | |
2546 | ||
2f77fc4b | 2547 | /* All good! */ |
f73fabfd | 2548 | ret = LTTNG_OK; |
2f77fc4b DG |
2549 | |
2550 | error: | |
2551 | return ret; | |
2552 | } | |
2553 | ||
2554 | /* | |
2555 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2556 | */ | |
2557 | int cmd_create_session_uri(char *name, struct lttng_uri *uris, | |
ecc48a90 | 2558 | size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer) |
2f77fc4b DG |
2559 | { |
2560 | int ret; | |
2f77fc4b DG |
2561 | struct ltt_session *session; |
2562 | ||
2563 | assert(name); | |
2bba9e53 | 2564 | assert(creds); |
785d2d0d | 2565 | |
2f77fc4b DG |
2566 | /* |
2567 | * Verify if the session already exist | |
2568 | * | |
2569 | * XXX: There is no need for the session lock list here since the caller | |
2570 | * (process_client_msg) is holding it. We might want to change that so a | |
2571 | * single command does not lock the entire session list. | |
2572 | */ | |
2573 | session = session_find_by_name(name); | |
2574 | if (session != NULL) { | |
f73fabfd | 2575 | ret = LTTNG_ERR_EXIST_SESS; |
2f77fc4b DG |
2576 | goto find_error; |
2577 | } | |
2578 | ||
2579 | /* Create tracing session in the registry */ | |
dec56f6c | 2580 | ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds), |
2f77fc4b | 2581 | LTTNG_SOCK_GET_GID_CRED(creds)); |
f73fabfd | 2582 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2583 | goto session_error; |
2584 | } | |
2585 | ||
2586 | /* | |
2587 | * Get the newly created session pointer back | |
2588 | * | |
2589 | * XXX: There is no need for the session lock list here since the caller | |
2590 | * (process_client_msg) is holding it. We might want to change that so a | |
2591 | * single command does not lock the entire session list. | |
2592 | */ | |
2593 | session = session_find_by_name(name); | |
2594 | assert(session); | |
2595 | ||
ecc48a90 | 2596 | session->live_timer = live_timer; |
2f77fc4b DG |
2597 | /* Create default consumer output for the session not yet created. */ |
2598 | session->consumer = consumer_create_output(CONSUMER_DST_LOCAL); | |
2599 | if (session->consumer == NULL) { | |
f73fabfd | 2600 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2601 | goto consumer_error; |
2602 | } | |
2603 | ||
2bba9e53 | 2604 | if (uris) { |
bda32d56 | 2605 | ret = cmd_set_consumer_uri(session, nb_uri, uris); |
2bba9e53 DG |
2606 | if (ret != LTTNG_OK) { |
2607 | goto consumer_error; | |
2608 | } | |
2609 | session->output_traces = 1; | |
2610 | } else { | |
2611 | session->output_traces = 0; | |
2612 | DBG2("Session %s created with no output", session->name); | |
2f77fc4b DG |
2613 | } |
2614 | ||
2615 | session->consumer->enabled = 1; | |
2616 | ||
f73fabfd | 2617 | return LTTNG_OK; |
2f77fc4b DG |
2618 | |
2619 | consumer_error: | |
2620 | session_destroy(session); | |
2621 | session_error: | |
2622 | find_error: | |
2623 | return ret; | |
2624 | } | |
2625 | ||
27babd3a DG |
2626 | /* |
2627 | * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread. | |
2628 | */ | |
2629 | int cmd_create_session_snapshot(char *name, struct lttng_uri *uris, | |
2630 | size_t nb_uri, lttng_sock_cred *creds) | |
2631 | { | |
2632 | int ret; | |
2633 | struct ltt_session *session; | |
2634 | struct snapshot_output *new_output = NULL; | |
2635 | ||
2636 | assert(name); | |
2637 | assert(creds); | |
2638 | ||
2639 | /* | |
2640 | * Create session in no output mode with URIs set to NULL. The uris we've | |
2641 | * received are for a default snapshot output if one. | |
2642 | */ | |
ae58b817 | 2643 | ret = cmd_create_session_uri(name, NULL, 0, creds, 0); |
27babd3a DG |
2644 | if (ret != LTTNG_OK) { |
2645 | goto error; | |
2646 | } | |
2647 | ||
2648 | /* Get the newly created session pointer back. This should NEVER fail. */ | |
2649 | session = session_find_by_name(name); | |
2650 | assert(session); | |
2651 | ||
2652 | /* Flag session for snapshot mode. */ | |
2653 | session->snapshot_mode = 1; | |
2654 | ||
2655 | /* Skip snapshot output creation if no URI is given. */ | |
2656 | if (nb_uri == 0) { | |
2657 | goto end; | |
2658 | } | |
2659 | ||
2660 | new_output = snapshot_output_alloc(); | |
2661 | if (!new_output) { | |
2662 | ret = LTTNG_ERR_NOMEM; | |
2663 | goto error_snapshot_alloc; | |
2664 | } | |
2665 | ||
2666 | ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL, | |
2667 | uris, nb_uri, session->consumer, new_output, &session->snapshot); | |
2668 | if (ret < 0) { | |
2669 | if (ret == -ENOMEM) { | |
2670 | ret = LTTNG_ERR_NOMEM; | |
2671 | } else { | |
2672 | ret = LTTNG_ERR_INVALID; | |
2673 | } | |
2674 | goto error_snapshot; | |
2675 | } | |
2676 | ||
2677 | rcu_read_lock(); | |
2678 | snapshot_add_output(&session->snapshot, new_output); | |
2679 | rcu_read_unlock(); | |
2680 | ||
2681 | end: | |
2682 | return LTTNG_OK; | |
2683 | ||
2684 | error_snapshot: | |
2685 | snapshot_output_destroy(new_output); | |
2686 | error_snapshot_alloc: | |
2687 | session_destroy(session); | |
2688 | error: | |
2689 | return ret; | |
2690 | } | |
2691 | ||
2f77fc4b DG |
2692 | /* |
2693 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
a9ad0c8f MD |
2694 | * |
2695 | * Called with session lock held. | |
2f77fc4b DG |
2696 | */ |
2697 | int cmd_destroy_session(struct ltt_session *session, int wpipe) | |
2698 | { | |
2699 | int ret; | |
2700 | struct ltt_ust_session *usess; | |
2701 | struct ltt_kernel_session *ksess; | |
2702 | ||
2703 | /* Safety net */ | |
2704 | assert(session); | |
2705 | ||
2706 | usess = session->ust_session; | |
2707 | ksess = session->kernel_session; | |
2708 | ||
2709 | /* Clean kernel session teardown */ | |
2710 | kernel_destroy_session(ksess); | |
2711 | ||
2712 | /* UST session teardown */ | |
2713 | if (usess) { | |
2714 | /* Close any relayd session */ | |
2715 | consumer_output_send_destroy_relayd(usess->consumer); | |
2716 | ||
2717 | /* Destroy every UST application related to this session. */ | |
2718 | ret = ust_app_destroy_trace_all(usess); | |
2719 | if (ret) { | |
2720 | ERR("Error in ust_app_destroy_trace_all"); | |
2721 | } | |
2722 | ||
2723 | /* Clean up the rest. */ | |
2724 | trace_ust_destroy_session(usess); | |
2725 | } | |
2726 | ||
2727 | /* | |
2728 | * Must notify the kernel thread here to update it's poll set in order to | |
2729 | * remove the channel(s)' fd just destroyed. | |
2730 | */ | |
2731 | ret = notify_thread_pipe(wpipe); | |
2732 | if (ret < 0) { | |
2733 | PERROR("write kernel poll pipe"); | |
2734 | } | |
2735 | ||
2736 | ret = session_destroy(session); | |
2737 | ||
2738 | return ret; | |
2739 | } | |
2740 | ||
2741 | /* | |
2742 | * Command LTTNG_CALIBRATE processed by the client thread. | |
2743 | */ | |
56a37563 JG |
2744 | int cmd_calibrate(enum lttng_domain_type domain, |
2745 | struct lttng_calibrate *calibrate) | |
2f77fc4b DG |
2746 | { |
2747 | int ret; | |
2748 | ||
2749 | switch (domain) { | |
2750 | case LTTNG_DOMAIN_KERNEL: | |
2751 | { | |
2752 | struct lttng_kernel_calibrate kcalibrate; | |
2753 | ||
2e84128e DG |
2754 | switch (calibrate->type) { |
2755 | case LTTNG_CALIBRATE_FUNCTION: | |
2756 | default: | |
2757 | /* Default and only possible calibrate option. */ | |
2758 | kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE; | |
2759 | break; | |
2760 | } | |
2761 | ||
2f77fc4b DG |
2762 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); |
2763 | if (ret < 0) { | |
f73fabfd | 2764 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
2f77fc4b DG |
2765 | goto error; |
2766 | } | |
2767 | break; | |
2768 | } | |
2769 | case LTTNG_DOMAIN_UST: | |
2770 | { | |
2771 | struct lttng_ust_calibrate ucalibrate; | |
2772 | ||
2e84128e DG |
2773 | switch (calibrate->type) { |
2774 | case LTTNG_CALIBRATE_FUNCTION: | |
2775 | default: | |
2776 | /* Default and only possible calibrate option. */ | |
2777 | ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT; | |
2778 | break; | |
2779 | } | |
2780 | ||
2f77fc4b DG |
2781 | ret = ust_app_calibrate_glb(&ucalibrate); |
2782 | if (ret < 0) { | |
f73fabfd | 2783 | ret = LTTNG_ERR_UST_CALIBRATE_FAIL; |
2f77fc4b DG |
2784 | goto error; |
2785 | } | |
2786 | break; | |
2787 | } | |
2788 | default: | |
f73fabfd | 2789 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2790 | goto error; |
2791 | } | |
2792 | ||
f73fabfd | 2793 | ret = LTTNG_OK; |
2f77fc4b DG |
2794 | |
2795 | error: | |
2796 | return ret; | |
2797 | } | |
2798 | ||
2799 | /* | |
2800 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
2801 | */ | |
56a37563 JG |
2802 | int cmd_register_consumer(struct ltt_session *session, |
2803 | enum lttng_domain_type domain, const char *sock_path, | |
2804 | struct consumer_data *cdata) | |
2f77fc4b DG |
2805 | { |
2806 | int ret, sock; | |
dd81b457 | 2807 | struct consumer_socket *socket = NULL; |
2f77fc4b DG |
2808 | |
2809 | assert(session); | |
2810 | assert(cdata); | |
2811 | assert(sock_path); | |
2812 | ||
2813 | switch (domain) { | |
2814 | case LTTNG_DOMAIN_KERNEL: | |
2815 | { | |
2816 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2817 | ||
2818 | assert(ksess); | |
2819 | ||
2820 | /* Can't register a consumer if there is already one */ | |
2821 | if (ksess->consumer_fds_sent != 0) { | |
f73fabfd | 2822 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
2823 | goto error; |
2824 | } | |
2825 | ||
2826 | sock = lttcomm_connect_unix_sock(sock_path); | |
2827 | if (sock < 0) { | |
f73fabfd | 2828 | ret = LTTNG_ERR_CONNECT_FAIL; |
2f77fc4b DG |
2829 | goto error; |
2830 | } | |
4ce514c4 | 2831 | cdata->cmd_sock = sock; |
2f77fc4b | 2832 | |
4ce514c4 | 2833 | socket = consumer_allocate_socket(&cdata->cmd_sock); |
2f77fc4b | 2834 | if (socket == NULL) { |
f66c074c DG |
2835 | ret = close(sock); |
2836 | if (ret < 0) { | |
2837 | PERROR("close register consumer"); | |
2838 | } | |
4ce514c4 | 2839 | cdata->cmd_sock = -1; |
f73fabfd | 2840 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2841 | goto error; |
2842 | } | |
2843 | ||
2844 | socket->lock = zmalloc(sizeof(pthread_mutex_t)); | |
2845 | if (socket->lock == NULL) { | |
2846 | PERROR("zmalloc pthread mutex"); | |
f73fabfd | 2847 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2848 | goto error; |
2849 | } | |
2850 | pthread_mutex_init(socket->lock, NULL); | |
2851 | socket->registered = 1; | |
2852 | ||
2853 | rcu_read_lock(); | |
2854 | consumer_add_socket(socket, ksess->consumer); | |
2855 | rcu_read_unlock(); | |
2856 | ||
2857 | pthread_mutex_lock(&cdata->pid_mutex); | |
2858 | cdata->pid = -1; | |
2859 | pthread_mutex_unlock(&cdata->pid_mutex); | |
2860 | ||
2861 | break; | |
2862 | } | |
2863 | default: | |
2864 | /* TODO: Userspace tracing */ | |
f73fabfd | 2865 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2866 | goto error; |
2867 | } | |
2868 | ||
dd81b457 | 2869 | return LTTNG_OK; |
2f77fc4b DG |
2870 | |
2871 | error: | |
dd81b457 DG |
2872 | if (socket) { |
2873 | consumer_destroy_socket(socket); | |
2874 | } | |
2f77fc4b DG |
2875 | return ret; |
2876 | } | |
2877 | ||
2878 | /* | |
2879 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
2880 | */ | |
2881 | ssize_t cmd_list_domains(struct ltt_session *session, | |
2882 | struct lttng_domain **domains) | |
2883 | { | |
2884 | int ret, index = 0; | |
2885 | ssize_t nb_dom = 0; | |
fefd409b DG |
2886 | struct agent *agt; |
2887 | struct lttng_ht_iter iter; | |
2f77fc4b DG |
2888 | |
2889 | if (session->kernel_session != NULL) { | |
2890 | DBG3("Listing domains found kernel domain"); | |
2891 | nb_dom++; | |
2892 | } | |
2893 | ||
2894 | if (session->ust_session != NULL) { | |
2895 | DBG3("Listing domains found UST global domain"); | |
2896 | nb_dom++; | |
3c6a091f | 2897 | |
e0a74f01 | 2898 | rcu_read_lock(); |
fefd409b DG |
2899 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2900 | agt, node.node) { | |
2901 | if (agt->being_used) { | |
2902 | nb_dom++; | |
2903 | } | |
3c6a091f | 2904 | } |
e0a74f01 | 2905 | rcu_read_unlock(); |
2f77fc4b DG |
2906 | } |
2907 | ||
fa64dfb4 JG |
2908 | if (!nb_dom) { |
2909 | goto end; | |
2910 | } | |
2911 | ||
2f77fc4b DG |
2912 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
2913 | if (*domains == NULL) { | |
f73fabfd | 2914 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2915 | goto error; |
2916 | } | |
2917 | ||
2918 | if (session->kernel_session != NULL) { | |
2919 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
b5edb9e8 PP |
2920 | |
2921 | /* Kernel session buffer type is always GLOBAL */ | |
2922 | (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL; | |
2923 | ||
2f77fc4b DG |
2924 | index++; |
2925 | } | |
2926 | ||
2927 | if (session->ust_session != NULL) { | |
2928 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
88c5f0d8 | 2929 | (*domains)[index].buf_type = session->ust_session->buffer_type; |
2f77fc4b | 2930 | index++; |
3c6a091f | 2931 | |
e0a74f01 | 2932 | rcu_read_lock(); |
fefd409b DG |
2933 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2934 | agt, node.node) { | |
2935 | if (agt->being_used) { | |
2936 | (*domains)[index].type = agt->domain; | |
2937 | (*domains)[index].buf_type = session->ust_session->buffer_type; | |
2938 | index++; | |
2939 | } | |
3c6a091f | 2940 | } |
e0a74f01 | 2941 | rcu_read_unlock(); |
2f77fc4b | 2942 | } |
fa64dfb4 | 2943 | end: |
2f77fc4b DG |
2944 | return nb_dom; |
2945 | ||
2946 | error: | |
f73fabfd DG |
2947 | /* Return negative value to differentiate return code */ |
2948 | return -ret; | |
2f77fc4b DG |
2949 | } |
2950 | ||
2951 | ||
2952 | /* | |
2953 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
2954 | */ | |
56a37563 JG |
2955 | ssize_t cmd_list_channels(enum lttng_domain_type domain, |
2956 | struct ltt_session *session, struct lttng_channel **channels) | |
2f77fc4b | 2957 | { |
53e367f9 | 2958 | ssize_t nb_chan = 0, payload_size = 0, ret; |
2f77fc4b DG |
2959 | |
2960 | switch (domain) { | |
2961 | case LTTNG_DOMAIN_KERNEL: | |
2962 | if (session->kernel_session != NULL) { | |
2963 | nb_chan = session->kernel_session->channel_count; | |
2964 | } | |
2965 | DBG3("Number of kernel channels %zd", nb_chan); | |
c7d620a2 | 2966 | if (nb_chan <= 0) { |
53e367f9 JG |
2967 | ret = -LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2968 | goto end; | |
c7d620a2 | 2969 | } |
2f77fc4b DG |
2970 | break; |
2971 | case LTTNG_DOMAIN_UST: | |
2972 | if (session->ust_session != NULL) { | |
7ffc31a2 | 2973 | rcu_read_lock(); |
2f77fc4b | 2974 | nb_chan = lttng_ht_get_count( |
7ffc31a2 JG |
2975 | session->ust_session->domain_global.channels); |
2976 | rcu_read_unlock(); | |
2f77fc4b DG |
2977 | } |
2978 | DBG3("Number of UST global channels %zd", nb_chan); | |
ade7ce52 | 2979 | if (nb_chan < 0) { |
53e367f9 JG |
2980 | ret = -LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2981 | goto end; | |
c7d620a2 | 2982 | } |
2f77fc4b DG |
2983 | break; |
2984 | default: | |
53e367f9 JG |
2985 | ret = -LTTNG_ERR_UND; |
2986 | goto end; | |
2f77fc4b DG |
2987 | } |
2988 | ||
2989 | if (nb_chan > 0) { | |
53e367f9 JG |
2990 | const size_t channel_size = sizeof(struct lttng_channel) + |
2991 | sizeof(struct lttcomm_channel_extended); | |
2992 | struct lttcomm_channel_extended *channel_exts; | |
2993 | ||
2994 | payload_size = nb_chan * channel_size; | |
2995 | *channels = zmalloc(payload_size); | |
2f77fc4b | 2996 | if (*channels == NULL) { |
53e367f9 JG |
2997 | ret = -LTTNG_ERR_FATAL; |
2998 | goto end; | |
2f77fc4b DG |
2999 | } |
3000 | ||
53e367f9 JG |
3001 | channel_exts = ((void *) *channels) + |
3002 | (nb_chan * sizeof(struct lttng_channel)); | |
3003 | list_lttng_channels(domain, session, *channels, channel_exts); | |
3004 | } else { | |
3005 | *channels = NULL; | |
2f77fc4b DG |
3006 | } |
3007 | ||
53e367f9 JG |
3008 | ret = payload_size; |
3009 | end: | |
3010 | return ret; | |
2f77fc4b DG |
3011 | } |
3012 | ||
3013 | /* | |
3014 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3015 | */ | |
56a37563 JG |
3016 | ssize_t cmd_list_events(enum lttng_domain_type domain, |
3017 | struct ltt_session *session, char *channel_name, | |
b4e3ceb9 | 3018 | struct lttng_event **events, size_t *total_size) |
2f77fc4b DG |
3019 | { |
3020 | int ret = 0; | |
3021 | ssize_t nb_event = 0; | |
3022 | ||
3023 | switch (domain) { | |
3024 | case LTTNG_DOMAIN_KERNEL: | |
3025 | if (session->kernel_session != NULL) { | |
3026 | nb_event = list_lttng_kernel_events(channel_name, | |
b4e3ceb9 PP |
3027 | session->kernel_session, events, |
3028 | total_size); | |
2f77fc4b DG |
3029 | } |
3030 | break; | |
3031 | case LTTNG_DOMAIN_UST: | |
3032 | { | |
3033 | if (session->ust_session != NULL) { | |
3034 | nb_event = list_lttng_ust_global_events(channel_name, | |
b4e3ceb9 PP |
3035 | &session->ust_session->domain_global, events, |
3036 | total_size); | |
2f77fc4b DG |
3037 | } |
3038 | break; | |
3039 | } | |
5cdb6027 | 3040 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 3041 | case LTTNG_DOMAIN_JUL: |
0e115563 | 3042 | case LTTNG_DOMAIN_PYTHON: |
3c6a091f | 3043 | if (session->ust_session) { |
fefd409b DG |
3044 | struct lttng_ht_iter iter; |
3045 | struct agent *agt; | |
3046 | ||
b11feea5 | 3047 | rcu_read_lock(); |
fefd409b DG |
3048 | cds_lfht_for_each_entry(session->ust_session->agents->ht, |
3049 | &iter.iter, agt, node.node) { | |
1dfd9906 JG |
3050 | if (agt->domain == domain) { |
3051 | nb_event = list_lttng_agent_events( | |
b4e3ceb9 PP |
3052 | agt, events, |
3053 | total_size); | |
1dfd9906 JG |
3054 | break; |
3055 | } | |
fefd409b | 3056 | } |
b11feea5 | 3057 | rcu_read_unlock(); |
3c6a091f DG |
3058 | } |
3059 | break; | |
2f77fc4b | 3060 | default: |
f73fabfd | 3061 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3062 | goto error; |
3063 | } | |
3064 | ||
f73fabfd | 3065 | return nb_event; |
2f77fc4b DG |
3066 | |
3067 | error: | |
f73fabfd DG |
3068 | /* Return negative value to differentiate return code */ |
3069 | return -ret; | |
2f77fc4b DG |
3070 | } |
3071 | ||
3072 | /* | |
3073 | * Using the session list, filled a lttng_session array to send back to the | |
3074 | * client for session listing. | |
3075 | * | |
3076 | * The session list lock MUST be acquired before calling this function. Use | |
3077 | * session_lock_list() and session_unlock_list(). | |
3078 | */ | |
3079 | void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid, | |
3080 | gid_t gid) | |
3081 | { | |
3082 | int ret; | |
3083 | unsigned int i = 0; | |
3084 | struct ltt_session *session; | |
3085 | struct ltt_session_list *list = session_get_list(); | |
3086 | ||
3087 | DBG("Getting all available session for UID %d GID %d", | |
3088 | uid, gid); | |
3089 | /* | |
3090 | * Iterate over session list and append data after the control struct in | |
3091 | * the buffer. | |
3092 | */ | |
3093 | cds_list_for_each_entry(session, &list->head, list) { | |
3094 | /* | |
3095 | * Only list the sessions the user can control. | |
3096 | */ | |
3097 | if (!session_access_ok(session, uid, gid)) { | |
3098 | continue; | |
3099 | } | |
3100 | ||
3101 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3102 | struct ltt_ust_session *usess = session->ust_session; | |
3103 | ||
3104 | if (session->consumer->type == CONSUMER_DST_NET || | |
3105 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
3106 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
3107 | ret = build_network_session_path(sessions[i].path, | |
dec56f6c | 3108 | sizeof(sessions[i].path), session); |
2f77fc4b | 3109 | } else { |
dec56f6c | 3110 | ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s", |
2f77fc4b DG |
3111 | session->consumer->dst.trace_path); |
3112 | } | |
3113 | if (ret < 0) { | |
3114 | PERROR("snprintf session path"); | |
3115 | continue; | |
3116 | } | |
3117 | ||
3118 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
3119 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
8382cf6f | 3120 | sessions[i].enabled = session->active; |
2cbf8fed | 3121 | sessions[i].snapshot_mode = session->snapshot_mode; |
8960e9cd | 3122 | sessions[i].live_timer_interval = session->live_timer; |
2f77fc4b DG |
3123 | i++; |
3124 | } | |
3125 | } | |
3126 | ||
806e2684 | 3127 | /* |
6d805429 | 3128 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
d3f14b8a | 3129 | * ready for trace analysis (or any kind of reader) or else 1 for pending data. |
806e2684 | 3130 | */ |
6d805429 | 3131 | int cmd_data_pending(struct ltt_session *session) |
806e2684 DG |
3132 | { |
3133 | int ret; | |
3134 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3135 | struct ltt_ust_session *usess = session->ust_session; | |
3136 | ||
3137 | assert(session); | |
3138 | ||
3139 | /* Session MUST be stopped to ask for data availability. */ | |
8382cf6f | 3140 | if (session->active) { |
806e2684 DG |
3141 | ret = LTTNG_ERR_SESSION_STARTED; |
3142 | goto error; | |
3a89d11a DG |
3143 | } else { |
3144 | /* | |
3145 | * If stopped, just make sure we've started before else the above call | |
3146 | * will always send that there is data pending. | |
3147 | * | |
3148 | * The consumer assumes that when the data pending command is received, | |
3149 | * the trace has been started before or else no output data is written | |
3150 | * by the streams which is a condition for data pending. So, this is | |
3151 | * *VERY* important that we don't ask the consumer before a start | |
3152 | * trace. | |
3153 | */ | |
8382cf6f | 3154 | if (!session->has_been_started) { |
3a89d11a DG |
3155 | ret = 0; |
3156 | goto error; | |
3157 | } | |
806e2684 DG |
3158 | } |
3159 | ||
3160 | if (ksess && ksess->consumer) { | |
6d805429 DG |
3161 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
3162 | if (ret == 1) { | |
806e2684 DG |
3163 | /* Data is still being extracted for the kernel. */ |
3164 | goto error; | |
3165 | } | |
3166 | } | |
3167 | ||
3168 | if (usess && usess->consumer) { | |
6d805429 DG |
3169 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
3170 | if (ret == 1) { | |
806e2684 DG |
3171 | /* Data is still being extracted for the kernel. */ |
3172 | goto error; | |
3173 | } | |
3174 | } | |
3175 | ||
3176 | /* Data is ready to be read by a viewer */ | |
6d805429 | 3177 | ret = 0; |
806e2684 DG |
3178 | |
3179 | error: | |
3180 | return ret; | |
3181 | } | |
3182 | ||
6dc3064a DG |
3183 | /* |
3184 | * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library. | |
3185 | * | |
3186 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3187 | */ | |
3188 | int cmd_snapshot_add_output(struct ltt_session *session, | |
3189 | struct lttng_snapshot_output *output, uint32_t *id) | |
3190 | { | |
3191 | int ret; | |
3192 | struct snapshot_output *new_output; | |
3193 | ||
3194 | assert(session); | |
3195 | assert(output); | |
3196 | ||
3197 | DBG("Cmd snapshot add output for session %s", session->name); | |
3198 | ||
3199 | /* | |
d3f14b8a MD |
3200 | * Permission denied to create an output if the session is not |
3201 | * set in no output mode. | |
6dc3064a DG |
3202 | */ |
3203 | if (session->output_traces) { | |
3204 | ret = LTTNG_ERR_EPERM; | |
3205 | goto error; | |
3206 | } | |
3207 | ||
3208 | /* Only one output is allowed until we have the "tee" feature. */ | |
3209 | if (session->snapshot.nb_output == 1) { | |
3210 | ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST; | |
3211 | goto error; | |
3212 | } | |
3213 | ||
3214 | new_output = snapshot_output_alloc(); | |
3215 | if (!new_output) { | |
3216 | ret = LTTNG_ERR_NOMEM; | |
3217 | goto error; | |
3218 | } | |
3219 | ||
3220 | ret = snapshot_output_init(output->max_size, output->name, | |
3221 | output->ctrl_url, output->data_url, session->consumer, new_output, | |
3222 | &session->snapshot); | |
3223 | if (ret < 0) { | |
3224 | if (ret == -ENOMEM) { | |
3225 | ret = LTTNG_ERR_NOMEM; | |
3226 | } else { | |
3227 | ret = LTTNG_ERR_INVALID; | |
3228 | } | |
3229 | goto free_error; | |
3230 | } | |
3231 | ||
6dc3064a DG |
3232 | rcu_read_lock(); |
3233 | snapshot_add_output(&session->snapshot, new_output); | |
3234 | if (id) { | |
3235 | *id = new_output->id; | |
3236 | } | |
3237 | rcu_read_unlock(); | |
3238 | ||
3239 | return LTTNG_OK; | |
3240 | ||
3241 | free_error: | |
3242 | snapshot_output_destroy(new_output); | |
3243 | error: | |
3244 | return ret; | |
3245 | } | |
3246 | ||
3247 | /* | |
3248 | * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl. | |
3249 | * | |
3250 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3251 | */ | |
3252 | int cmd_snapshot_del_output(struct ltt_session *session, | |
3253 | struct lttng_snapshot_output *output) | |
3254 | { | |
3255 | int ret; | |
eb240553 | 3256 | struct snapshot_output *sout = NULL; |
6dc3064a DG |
3257 | |
3258 | assert(session); | |
3259 | assert(output); | |
3260 | ||
6dc3064a DG |
3261 | rcu_read_lock(); |
3262 | ||
3263 | /* | |
d3f14b8a MD |
3264 | * Permission denied to create an output if the session is not |
3265 | * set in no output mode. | |
6dc3064a DG |
3266 | */ |
3267 | if (session->output_traces) { | |
3268 | ret = LTTNG_ERR_EPERM; | |
3269 | goto error; | |
3270 | } | |
3271 | ||
eb240553 DG |
3272 | if (output->id) { |
3273 | DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id, | |
3274 | session->name); | |
3275 | sout = snapshot_find_output_by_id(output->id, &session->snapshot); | |
3276 | } else if (*output->name != '\0') { | |
3277 | DBG("Cmd snapshot del output name %s for session %s", output->name, | |
3278 | session->name); | |
3279 | sout = snapshot_find_output_by_name(output->name, &session->snapshot); | |
3280 | } | |
6dc3064a DG |
3281 | if (!sout) { |
3282 | ret = LTTNG_ERR_INVALID; | |
3283 | goto error; | |
3284 | } | |
3285 | ||
3286 | snapshot_delete_output(&session->snapshot, sout); | |
3287 | snapshot_output_destroy(sout); | |
3288 | ret = LTTNG_OK; | |
3289 | ||
3290 | error: | |
3291 | rcu_read_unlock(); | |
3292 | return ret; | |
3293 | } | |
3294 | ||
3295 | /* | |
3296 | * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl. | |
3297 | * | |
3298 | * If no output is available, outputs is untouched and 0 is returned. | |
3299 | * | |
3300 | * Return the size of the newly allocated outputs or a negative LTTNG_ERR code. | |
3301 | */ | |
3302 | ssize_t cmd_snapshot_list_outputs(struct ltt_session *session, | |
3303 | struct lttng_snapshot_output **outputs) | |
3304 | { | |
3305 | int ret, idx = 0; | |
b223ca94 | 3306 | struct lttng_snapshot_output *list = NULL; |
6dc3064a DG |
3307 | struct lttng_ht_iter iter; |
3308 | struct snapshot_output *output; | |
3309 | ||
3310 | assert(session); | |
3311 | assert(outputs); | |
3312 | ||
3313 | DBG("Cmd snapshot list outputs for session %s", session->name); | |
3314 | ||
3315 | /* | |
d3f14b8a MD |
3316 | * Permission denied to create an output if the session is not |
3317 | * set in no output mode. | |
6dc3064a DG |
3318 | */ |
3319 | if (session->output_traces) { | |
b223ca94 | 3320 | ret = -LTTNG_ERR_EPERM; |
6dc3064a DG |
3321 | goto error; |
3322 | } | |
3323 | ||
3324 | if (session->snapshot.nb_output == 0) { | |
3325 | ret = 0; | |
3326 | goto error; | |
3327 | } | |
3328 | ||
3329 | list = zmalloc(session->snapshot.nb_output * sizeof(*list)); | |
3330 | if (!list) { | |
b223ca94 | 3331 | ret = -LTTNG_ERR_NOMEM; |
6dc3064a DG |
3332 | goto error; |
3333 | } | |
3334 | ||
3335 | /* Copy list from session to the new list object. */ | |
b223ca94 | 3336 | rcu_read_lock(); |
6dc3064a DG |
3337 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter, |
3338 | output, node.node) { | |
3339 | assert(output->consumer); | |
3340 | list[idx].id = output->id; | |
3341 | list[idx].max_size = output->max_size; | |
3342 | strncpy(list[idx].name, output->name, sizeof(list[idx].name)); | |
3343 | if (output->consumer->type == CONSUMER_DST_LOCAL) { | |
3344 | strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path, | |
3345 | sizeof(list[idx].ctrl_url)); | |
3346 | } else { | |
3347 | /* Control URI. */ | |
3348 | ret = uri_to_str_url(&output->consumer->dst.net.control, | |
3349 | list[idx].ctrl_url, sizeof(list[idx].ctrl_url)); | |
3350 | if (ret < 0) { | |
b223ca94 JG |
3351 | ret = -LTTNG_ERR_NOMEM; |
3352 | goto error; | |
6dc3064a DG |
3353 | } |
3354 | ||
3355 | /* Data URI. */ | |
3356 | ret = uri_to_str_url(&output->consumer->dst.net.data, | |
3357 | list[idx].data_url, sizeof(list[idx].data_url)); | |
3358 | if (ret < 0) { | |
b223ca94 JG |
3359 | ret = -LTTNG_ERR_NOMEM; |
3360 | goto error; | |
6dc3064a DG |
3361 | } |
3362 | } | |
3363 | idx++; | |
3364 | } | |
3365 | ||
3366 | *outputs = list; | |
b223ca94 JG |
3367 | list = NULL; |
3368 | ret = session->snapshot.nb_output; | |
6dc3064a | 3369 | error: |
b223ca94 JG |
3370 | free(list); |
3371 | rcu_read_unlock(); | |
3372 | return ret; | |
6dc3064a DG |
3373 | } |
3374 | ||
3375 | /* | |
3376 | * Send relayd sockets from snapshot output to consumer. Ignore request if the | |
3377 | * snapshot output is *not* set with a remote destination. | |
3378 | * | |
a934f4af | 3379 | * Return 0 on success or a LTTNG_ERR code. |
6dc3064a DG |
3380 | */ |
3381 | static int set_relayd_for_snapshot(struct consumer_output *consumer, | |
3382 | struct snapshot_output *snap_output, struct ltt_session *session) | |
3383 | { | |
a934f4af | 3384 | int ret = LTTNG_OK; |
6dc3064a DG |
3385 | struct lttng_ht_iter iter; |
3386 | struct consumer_socket *socket; | |
3387 | ||
3388 | assert(consumer); | |
3389 | assert(snap_output); | |
3390 | assert(session); | |
3391 | ||
3392 | DBG2("Set relayd object from snapshot output"); | |
3393 | ||
3394 | /* Ignore if snapshot consumer output is not network. */ | |
3395 | if (snap_output->consumer->type != CONSUMER_DST_NET) { | |
3396 | goto error; | |
3397 | } | |
3398 | ||
3399 | /* | |
3400 | * For each consumer socket, create and send the relayd object of the | |
3401 | * snapshot output. | |
3402 | */ | |
3403 | rcu_read_lock(); | |
5eecee74 DG |
3404 | cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter, |
3405 | socket, node.node) { | |
6dc3064a | 3406 | ret = send_consumer_relayd_sockets(0, session->id, |
d3e2ba59 JD |
3407 | snap_output->consumer, socket, |
3408 | session->name, session->hostname, | |
3409 | session->live_timer); | |
a934f4af | 3410 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3411 | rcu_read_unlock(); |
3412 | goto error; | |
3413 | } | |
3414 | } | |
3415 | rcu_read_unlock(); | |
3416 | ||
3417 | error: | |
3418 | return ret; | |
3419 | } | |
3420 | ||
3421 | /* | |
3422 | * Record a kernel snapshot. | |
3423 | * | |
fac41e72 | 3424 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a DG |
3425 | */ |
3426 | static int record_kernel_snapshot(struct ltt_kernel_session *ksess, | |
5c786ded | 3427 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3428 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3429 | { |
3430 | int ret; | |
3431 | ||
3432 | assert(ksess); | |
3433 | assert(output); | |
3434 | assert(session); | |
3435 | ||
10a50311 JD |
3436 | /* Get the datetime for the snapshot output directory. */ |
3437 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime, | |
3438 | sizeof(output->datetime)); | |
3439 | if (!ret) { | |
a934f4af | 3440 | ret = LTTNG_ERR_INVALID; |
10a50311 JD |
3441 | goto error; |
3442 | } | |
3443 | ||
af706bb7 DG |
3444 | /* |
3445 | * Copy kernel session sockets so we can communicate with the right | |
3446 | * consumer for the snapshot record command. | |
3447 | */ | |
3448 | ret = consumer_copy_sockets(output->consumer, ksess->consumer); | |
3449 | if (ret < 0) { | |
a934f4af | 3450 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3451 | goto error; |
6dc3064a DG |
3452 | } |
3453 | ||
3454 | ret = set_relayd_for_snapshot(ksess->consumer, output, session); | |
a934f4af | 3455 | if (ret != LTTNG_OK) { |
af706bb7 | 3456 | goto error_snapshot; |
6dc3064a DG |
3457 | } |
3458 | ||
d07ceecd | 3459 | ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream); |
2a06df8d | 3460 | if (ret != LTTNG_OK) { |
af706bb7 | 3461 | goto error_snapshot; |
6dc3064a DG |
3462 | } |
3463 | ||
a934f4af | 3464 | ret = LTTNG_OK; |
1371fc12 | 3465 | goto end; |
a934f4af | 3466 | |
af706bb7 DG |
3467 | error_snapshot: |
3468 | /* Clean up copied sockets so this output can use some other later on. */ | |
3469 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a | 3470 | error: |
1371fc12 | 3471 | end: |
6dc3064a DG |
3472 | return ret; |
3473 | } | |
3474 | ||
3475 | /* | |
3476 | * Record a UST snapshot. | |
3477 | * | |
a934f4af | 3478 | * Return 0 on success or a LTTNG_ERR error code. |
6dc3064a DG |
3479 | */ |
3480 | static int record_ust_snapshot(struct ltt_ust_session *usess, | |
5c786ded | 3481 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3482 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3483 | { |
3484 | int ret; | |
3485 | ||
3486 | assert(usess); | |
3487 | assert(output); | |
3488 | assert(session); | |
3489 | ||
10a50311 JD |
3490 | /* Get the datetime for the snapshot output directory. */ |
3491 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime, | |
3492 | sizeof(output->datetime)); | |
3493 | if (!ret) { | |
a934f4af | 3494 | ret = LTTNG_ERR_INVALID; |
10a50311 JD |
3495 | goto error; |
3496 | } | |
3497 | ||
af706bb7 | 3498 | /* |
d3f14b8a | 3499 | * Copy UST session sockets so we can communicate with the right |
af706bb7 DG |
3500 | * consumer for the snapshot record command. |
3501 | */ | |
3502 | ret = consumer_copy_sockets(output->consumer, usess->consumer); | |
3503 | if (ret < 0) { | |
a934f4af | 3504 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3505 | goto error; |
6dc3064a DG |
3506 | } |
3507 | ||
3508 | ret = set_relayd_for_snapshot(usess->consumer, output, session); | |
a934f4af | 3509 | if (ret != LTTNG_OK) { |
af706bb7 | 3510 | goto error_snapshot; |
6dc3064a DG |
3511 | } |
3512 | ||
d07ceecd | 3513 | ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream); |
6dc3064a | 3514 | if (ret < 0) { |
7badf927 DG |
3515 | switch (-ret) { |
3516 | case EINVAL: | |
a934f4af | 3517 | ret = LTTNG_ERR_INVALID; |
7badf927 DG |
3518 | break; |
3519 | case ENODATA: | |
3520 | ret = LTTNG_ERR_SNAPSHOT_NODATA; | |
3521 | break; | |
3522 | default: | |
3523 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
3524 | break; | |
5c786ded | 3525 | } |
af706bb7 | 3526 | goto error_snapshot; |
6dc3064a DG |
3527 | } |
3528 | ||
a934f4af DG |
3529 | ret = LTTNG_OK; |
3530 | ||
af706bb7 DG |
3531 | error_snapshot: |
3532 | /* Clean up copied sockets so this output can use some other later on. */ | |
3533 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a DG |
3534 | error: |
3535 | return ret; | |
3536 | } | |
3537 | ||
d07ceecd MD |
3538 | static |
3539 | uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session, | |
3540 | uint64_t cur_nr_packets) | |
68808f4e | 3541 | { |
d07ceecd | 3542 | uint64_t tot_size = 0; |
68808f4e DG |
3543 | |
3544 | if (session->kernel_session) { | |
3545 | struct ltt_kernel_channel *chan; | |
3546 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3547 | ||
68808f4e | 3548 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
d07ceecd MD |
3549 | if (cur_nr_packets >= chan->channel->attr.num_subbuf) { |
3550 | /* | |
3551 | * Don't take channel into account if we | |
3552 | * already grab all its packets. | |
3553 | */ | |
3554 | continue; | |
68808f4e | 3555 | } |
d07ceecd MD |
3556 | tot_size += chan->channel->attr.subbuf_size |
3557 | * chan->stream_count; | |
68808f4e DG |
3558 | } |
3559 | } | |
3560 | ||
3561 | if (session->ust_session) { | |
68808f4e DG |
3562 | struct ltt_ust_session *usess = session->ust_session; |
3563 | ||
d07ceecd MD |
3564 | tot_size += ust_app_get_size_one_more_packet_per_stream(usess, |
3565 | cur_nr_packets); | |
68808f4e DG |
3566 | } |
3567 | ||
d07ceecd | 3568 | return tot_size; |
68808f4e DG |
3569 | } |
3570 | ||
5c786ded | 3571 | /* |
d07ceecd MD |
3572 | * Calculate the number of packets we can grab from each stream that |
3573 | * fits within the overall snapshot max size. | |
3574 | * | |
3575 | * Returns -1 on error, 0 means infinite number of packets, else > 0 is | |
3576 | * the number of packets per stream. | |
3577 | * | |
3578 | * TODO: this approach is not perfect: we consider the worse case | |
3579 | * (packet filling the sub-buffers) as an upper bound, but we could do | |
3580 | * better if we do this calculation while we actually grab the packet | |
3581 | * content: we would know how much padding we don't actually store into | |
3582 | * the file. | |
3583 | * | |
3584 | * This algorithm is currently bounded by the number of packets per | |
3585 | * stream. | |
3586 | * | |
3587 | * Since we call this algorithm before actually grabbing the data, it's | |
3588 | * an approximation: for instance, applications could appear/disappear | |
3589 | * in between this call and actually grabbing data. | |
5c786ded | 3590 | */ |
d07ceecd MD |
3591 | static |
3592 | int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size) | |
5c786ded | 3593 | { |
d07ceecd MD |
3594 | int64_t size_left; |
3595 | uint64_t cur_nb_packets = 0; | |
5c786ded | 3596 | |
d07ceecd MD |
3597 | if (!max_size) { |
3598 | return 0; /* Infinite */ | |
5c786ded JD |
3599 | } |
3600 | ||
d07ceecd MD |
3601 | size_left = max_size; |
3602 | for (;;) { | |
3603 | uint64_t one_more_packet_tot_size; | |
5c786ded | 3604 | |
d07ceecd MD |
3605 | one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session, |
3606 | cur_nb_packets); | |
3607 | if (!one_more_packet_tot_size) { | |
3608 | /* We are already grabbing all packets. */ | |
3609 | break; | |
3610 | } | |
3611 | size_left -= one_more_packet_tot_size; | |
3612 | if (size_left < 0) { | |
3613 | break; | |
3614 | } | |
3615 | cur_nb_packets++; | |
5c786ded | 3616 | } |
d07ceecd MD |
3617 | if (!cur_nb_packets) { |
3618 | /* Not enough room to grab one packet of each stream, error. */ | |
3619 | return -1; | |
3620 | } | |
3621 | return cur_nb_packets; | |
5c786ded JD |
3622 | } |
3623 | ||
6dc3064a DG |
3624 | /* |
3625 | * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl. | |
3626 | * | |
3627 | * The wait parameter is ignored so this call always wait for the snapshot to | |
3628 | * complete before returning. | |
3629 | * | |
3630 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3631 | */ | |
3632 | int cmd_snapshot_record(struct ltt_session *session, | |
3633 | struct lttng_snapshot_output *output, int wait) | |
3634 | { | |
3635 | int ret = LTTNG_OK; | |
e1986656 DG |
3636 | unsigned int use_tmp_output = 0; |
3637 | struct snapshot_output tmp_output; | |
00e1dfc4 | 3638 | unsigned int snapshot_success = 0; |
6dc3064a DG |
3639 | |
3640 | assert(session); | |
ba45d9f0 | 3641 | assert(output); |
6dc3064a DG |
3642 | |
3643 | DBG("Cmd snapshot record for session %s", session->name); | |
3644 | ||
3645 | /* | |
d3f14b8a MD |
3646 | * Permission denied to create an output if the session is not |
3647 | * set in no output mode. | |
6dc3064a DG |
3648 | */ |
3649 | if (session->output_traces) { | |
3650 | ret = LTTNG_ERR_EPERM; | |
3651 | goto error; | |
3652 | } | |
3653 | ||
3654 | /* The session needs to be started at least once. */ | |
8382cf6f | 3655 | if (!session->has_been_started) { |
6dc3064a DG |
3656 | ret = LTTNG_ERR_START_SESSION_ONCE; |
3657 | goto error; | |
3658 | } | |
3659 | ||
3660 | /* Use temporary output for the session. */ | |
ba45d9f0 | 3661 | if (*output->ctrl_url != '\0') { |
6dc3064a DG |
3662 | ret = snapshot_output_init(output->max_size, output->name, |
3663 | output->ctrl_url, output->data_url, session->consumer, | |
e1986656 | 3664 | &tmp_output, NULL); |
6dc3064a DG |
3665 | if (ret < 0) { |
3666 | if (ret == -ENOMEM) { | |
3667 | ret = LTTNG_ERR_NOMEM; | |
3668 | } else { | |
3669 | ret = LTTNG_ERR_INVALID; | |
3670 | } | |
3671 | goto error; | |
3672 | } | |
1bfe7328 DG |
3673 | /* Use the global session count for the temporary snapshot. */ |
3674 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; | |
e1986656 | 3675 | use_tmp_output = 1; |
6dc3064a DG |
3676 | } |
3677 | ||
3678 | if (session->kernel_session) { | |
3679 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3680 | ||
e1986656 | 3681 | if (use_tmp_output) { |
d07ceecd MD |
3682 | int64_t nb_packets_per_stream; |
3683 | ||
3684 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
3685 | tmp_output.max_size); | |
3686 | if (nb_packets_per_stream < 0) { | |
3687 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
3688 | goto error; | |
3689 | } | |
e1986656 | 3690 | ret = record_kernel_snapshot(ksess, &tmp_output, session, |
d07ceecd | 3691 | wait, nb_packets_per_stream); |
a934f4af | 3692 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3693 | goto error; |
3694 | } | |
1bfe7328 | 3695 | snapshot_success = 1; |
6dc3064a DG |
3696 | } else { |
3697 | struct snapshot_output *sout; | |
3698 | struct lttng_ht_iter iter; | |
3699 | ||
3700 | rcu_read_lock(); | |
3701 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
3702 | &iter.iter, sout, node.node) { | |
d07ceecd MD |
3703 | int64_t nb_packets_per_stream; |
3704 | ||
e1986656 DG |
3705 | /* |
3706 | * Make a local copy of the output and assign the possible | |
3707 | * temporary value given by the caller. | |
3708 | */ | |
3709 | memset(&tmp_output, 0, sizeof(tmp_output)); | |
3710 | memcpy(&tmp_output, sout, sizeof(tmp_output)); | |
3711 | ||
e1986656 DG |
3712 | if (output->max_size != (uint64_t) -1ULL) { |
3713 | tmp_output.max_size = output->max_size; | |
3714 | } | |
3715 | ||
d07ceecd MD |
3716 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, |
3717 | tmp_output.max_size); | |
3718 | if (nb_packets_per_stream < 0) { | |
68808f4e DG |
3719 | ret = LTTNG_ERR_MAX_SIZE_INVALID; |
3720 | goto error; | |
3721 | } | |
3722 | ||
e1986656 DG |
3723 | /* Use temporary name. */ |
3724 | if (*output->name != '\0') { | |
3725 | strncpy(tmp_output.name, output->name, | |
3726 | sizeof(tmp_output.name)); | |
3727 | } | |
3728 | ||
1bfe7328 DG |
3729 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; |
3730 | ||
e1986656 | 3731 | ret = record_kernel_snapshot(ksess, &tmp_output, |
d07ceecd | 3732 | session, wait, nb_packets_per_stream); |
a934f4af | 3733 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3734 | rcu_read_unlock(); |
3735 | goto error; | |
3736 | } | |
1bfe7328 | 3737 | snapshot_success = 1; |
6dc3064a DG |
3738 | } |
3739 | rcu_read_unlock(); | |
3740 | } | |
3741 | } | |
3742 | ||
3743 | if (session->ust_session) { | |
3744 | struct ltt_ust_session *usess = session->ust_session; | |
3745 | ||
e1986656 | 3746 | if (use_tmp_output) { |
d07ceecd MD |
3747 | int64_t nb_packets_per_stream; |
3748 | ||
3749 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
3750 | tmp_output.max_size); | |
3751 | if (nb_packets_per_stream < 0) { | |
3752 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
3753 | goto error; | |
3754 | } | |
e1986656 | 3755 | ret = record_ust_snapshot(usess, &tmp_output, session, |
d07ceecd | 3756 | wait, nb_packets_per_stream); |
a934f4af | 3757 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3758 | goto error; |
3759 | } | |
1bfe7328 | 3760 | snapshot_success = 1; |
6dc3064a DG |
3761 | } else { |
3762 | struct snapshot_output *sout; | |
3763 | struct lttng_ht_iter iter; | |
3764 | ||
3765 | rcu_read_lock(); | |
3766 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
3767 | &iter.iter, sout, node.node) { | |
d07ceecd MD |
3768 | int64_t nb_packets_per_stream; |
3769 | ||
e1986656 DG |
3770 | /* |
3771 | * Make a local copy of the output and assign the possible | |
3772 | * temporary value given by the caller. | |
3773 | */ | |
3774 | memset(&tmp_output, 0, sizeof(tmp_output)); | |
3775 | memcpy(&tmp_output, sout, sizeof(tmp_output)); | |
3776 | ||
e1986656 DG |
3777 | if (output->max_size != (uint64_t) -1ULL) { |
3778 | tmp_output.max_size = output->max_size; | |
3779 | } | |
3780 | ||
d07ceecd MD |
3781 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, |
3782 | tmp_output.max_size); | |
3783 | if (nb_packets_per_stream < 0) { | |
68808f4e | 3784 | ret = LTTNG_ERR_MAX_SIZE_INVALID; |
d07ceecd | 3785 | rcu_read_unlock(); |
68808f4e DG |
3786 | goto error; |
3787 | } | |
3788 | ||
e1986656 DG |
3789 | /* Use temporary name. */ |
3790 | if (*output->name != '\0') { | |
3791 | strncpy(tmp_output.name, output->name, | |
3792 | sizeof(tmp_output.name)); | |
3793 | } | |
3794 | ||
1bfe7328 DG |
3795 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; |
3796 | ||
e1986656 | 3797 | ret = record_ust_snapshot(usess, &tmp_output, session, |
d07ceecd | 3798 | wait, nb_packets_per_stream); |
a934f4af | 3799 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3800 | rcu_read_unlock(); |
3801 | goto error; | |
3802 | } | |
1bfe7328 | 3803 | snapshot_success = 1; |
6dc3064a DG |
3804 | } |
3805 | rcu_read_unlock(); | |
3806 | } | |
3807 | } | |
3808 | ||
1bfe7328 DG |
3809 | if (snapshot_success) { |
3810 | session->snapshot.nb_snapshot++; | |
b67578cb MD |
3811 | } else { |
3812 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
1bfe7328 DG |
3813 | } |
3814 | ||
6dc3064a | 3815 | error: |
6dc3064a DG |
3816 | return ret; |
3817 | } | |
3818 | ||
d7ba1388 MD |
3819 | /* |
3820 | * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread. | |
3821 | */ | |
3822 | int cmd_set_session_shm_path(struct ltt_session *session, | |
3823 | const char *shm_path) | |
3824 | { | |
3825 | /* Safety net */ | |
3826 | assert(session); | |
3827 | ||
3828 | /* | |
3829 | * Can only set shm path before session is started. | |
3830 | */ | |
3831 | if (session->has_been_started) { | |
3832 | return LTTNG_ERR_SESSION_STARTED; | |
3833 | } | |
3834 | ||
3835 | strncpy(session->shm_path, shm_path, | |
3836 | sizeof(session->shm_path)); | |
3837 | session->shm_path[sizeof(session->shm_path) - 1] = '\0'; | |
3838 | ||
3839 | return 0; | |
3840 | } | |
3841 | ||
2f77fc4b DG |
3842 | /* |
3843 | * Init command subsystem. | |
3844 | */ | |
3845 | void cmd_init(void) | |
3846 | { | |
3847 | /* | |
d88aee68 DG |
3848 | * Set network sequence index to 1 for streams to match a relayd |
3849 | * socket on the consumer side. | |
2f77fc4b | 3850 | */ |
d88aee68 DG |
3851 | pthread_mutex_lock(&relayd_net_seq_idx_lock); |
3852 | relayd_net_seq_idx = 1; | |
3853 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
3854 | |
3855 | DBG("Command subsystem initialized"); | |
3856 | } |