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