Commit | Line | Data |
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2f77fc4b DG |
1 | /* |
2 | * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com> | |
bdf64013 | 3 | * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
2f77fc4b DG |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License, version 2 only, as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
16 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | */ | |
18 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
2f77fc4b | 20 | #include <assert.h> |
6dc3064a | 21 | #include <inttypes.h> |
2f77fc4b DG |
22 | #include <urcu/list.h> |
23 | #include <urcu/uatomic.h> | |
24 | ||
25 | #include <common/defaults.h> | |
26 | #include <common/common.h> | |
27 | #include <common/sessiond-comm/sessiond-comm.h> | |
28 | #include <common/relayd/relayd.h> | |
10a50311 | 29 | #include <common/utils.h> |
f5436bfc | 30 | #include <common/compat/string.h> |
93ec662e | 31 | #include <common/kernel-ctl/kernel-ctl.h> |
2f77fc4b DG |
32 | |
33 | #include "channel.h" | |
34 | #include "consumer.h" | |
35 | #include "event.h" | |
8782cc74 | 36 | #include "health-sessiond.h" |
2f77fc4b DG |
37 | #include "kernel.h" |
38 | #include "kernel-consumer.h" | |
39 | #include "lttng-sessiond.h" | |
40 | #include "utils.h" | |
834978fd | 41 | #include "syscall.h" |
7c1d2758 | 42 | #include "agent.h" |
93ec662e | 43 | #include "buffer-registry.h" |
2f77fc4b DG |
44 | |
45 | #include "cmd.h" | |
46 | ||
47 | /* | |
48 | * Used to keep a unique index for each relayd socket created where this value | |
49 | * is associated with streams on the consumer so it can match the right relayd | |
d88aee68 DG |
50 | * to send to. It must be accessed with the relayd_net_seq_idx_lock |
51 | * held. | |
2f77fc4b | 52 | */ |
d88aee68 DG |
53 | static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER; |
54 | static uint64_t relayd_net_seq_idx; | |
2f77fc4b | 55 | |
7076b56e JG |
56 | static int validate_event_name(const char *); |
57 | static int validate_ust_event_name(const char *); | |
58 | static int cmd_enable_event_internal(struct ltt_session *session, | |
59 | struct lttng_domain *domain, | |
60 | char *channel_name, struct lttng_event *event, | |
61 | char *filter_expression, | |
62 | struct lttng_filter_bytecode *filter, | |
63 | struct lttng_event_exclusion *exclusion, | |
64 | int wpipe); | |
65 | ||
2f77fc4b DG |
66 | /* |
67 | * Create a session path used by list_lttng_sessions for the case that the | |
68 | * session consumer is on the network. | |
69 | */ | |
70 | static int build_network_session_path(char *dst, size_t size, | |
71 | struct ltt_session *session) | |
72 | { | |
73 | int ret, kdata_port, udata_port; | |
74 | struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL; | |
75 | char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX]; | |
76 | ||
77 | assert(session); | |
78 | assert(dst); | |
79 | ||
80 | memset(tmp_urls, 0, sizeof(tmp_urls)); | |
81 | memset(tmp_uurl, 0, sizeof(tmp_uurl)); | |
82 | ||
83 | kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT; | |
84 | ||
85 | if (session->kernel_session && session->kernel_session->consumer) { | |
86 | kuri = &session->kernel_session->consumer->dst.net.control; | |
87 | kdata_port = session->kernel_session->consumer->dst.net.data.port; | |
88 | } | |
89 | ||
90 | if (session->ust_session && session->ust_session->consumer) { | |
91 | uuri = &session->ust_session->consumer->dst.net.control; | |
92 | udata_port = session->ust_session->consumer->dst.net.data.port; | |
93 | } | |
94 | ||
95 | if (uuri == NULL && kuri == NULL) { | |
96 | uri = &session->consumer->dst.net.control; | |
97 | kdata_port = session->consumer->dst.net.data.port; | |
98 | } else if (kuri && uuri) { | |
99 | ret = uri_compare(kuri, uuri); | |
100 | if (ret) { | |
101 | /* Not Equal */ | |
102 | uri = kuri; | |
103 | /* Build uuri URL string */ | |
104 | ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl)); | |
105 | if (ret < 0) { | |
106 | goto error; | |
107 | } | |
108 | } else { | |
109 | uri = kuri; | |
110 | } | |
111 | } else if (kuri && uuri == NULL) { | |
112 | uri = kuri; | |
113 | } else if (uuri && kuri == NULL) { | |
114 | uri = uuri; | |
115 | } | |
116 | ||
117 | ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls)); | |
118 | if (ret < 0) { | |
119 | goto error; | |
120 | } | |
121 | ||
9aa9f900 DG |
122 | /* |
123 | * Do we have a UST url set. If yes, this means we have both kernel and UST | |
124 | * to print. | |
125 | */ | |
9d035200 | 126 | if (*tmp_uurl != '\0') { |
2f77fc4b DG |
127 | ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]", |
128 | tmp_urls, kdata_port, tmp_uurl, udata_port); | |
129 | } else { | |
9aa9f900 | 130 | int dport; |
bef08707 | 131 | if (kuri || (!kuri && !uuri)) { |
9aa9f900 DG |
132 | dport = kdata_port; |
133 | } else { | |
134 | /* No kernel URI, use the UST port. */ | |
135 | dport = udata_port; | |
136 | } | |
137 | ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport); | |
2f77fc4b DG |
138 | } |
139 | ||
140 | error: | |
141 | return ret; | |
142 | } | |
143 | ||
fb83fe64 JD |
144 | /* |
145 | * Get run-time attributes if the session has been started (discarded events, | |
146 | * lost packets). | |
147 | */ | |
148 | static int get_kernel_runtime_stats(struct ltt_session *session, | |
149 | struct ltt_kernel_channel *kchan, uint64_t *discarded_events, | |
150 | uint64_t *lost_packets) | |
151 | { | |
152 | int ret; | |
153 | ||
154 | if (!session->has_been_started) { | |
155 | ret = 0; | |
156 | *discarded_events = 0; | |
157 | *lost_packets = 0; | |
158 | goto end; | |
159 | } | |
160 | ||
161 | ret = consumer_get_discarded_events(session->id, kchan->fd, | |
162 | session->kernel_session->consumer, | |
163 | discarded_events); | |
164 | if (ret < 0) { | |
165 | goto end; | |
166 | } | |
167 | ||
168 | ret = consumer_get_lost_packets(session->id, kchan->fd, | |
169 | session->kernel_session->consumer, | |
170 | lost_packets); | |
171 | if (ret < 0) { | |
172 | goto end; | |
173 | } | |
174 | ||
175 | end: | |
176 | return ret; | |
177 | } | |
178 | ||
179 | /* | |
180 | * Get run-time attributes if the session has been started (discarded events, | |
181 | * lost packets). | |
182 | */ | |
183 | static int get_ust_runtime_stats(struct ltt_session *session, | |
184 | struct ltt_ust_channel *uchan, uint64_t *discarded_events, | |
185 | uint64_t *lost_packets) | |
186 | { | |
187 | int ret; | |
188 | struct ltt_ust_session *usess; | |
189 | ||
190 | usess = session->ust_session; | |
191 | ||
192 | if (!usess || !session->has_been_started) { | |
193 | *discarded_events = 0; | |
194 | *lost_packets = 0; | |
195 | ret = 0; | |
196 | goto end; | |
197 | } | |
198 | ||
199 | if (usess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
200 | ret = ust_app_uid_get_channel_runtime_stats(usess->id, | |
201 | &usess->buffer_reg_uid_list, | |
202 | usess->consumer, uchan->id, | |
203 | uchan->attr.overwrite, | |
204 | discarded_events, | |
205 | lost_packets); | |
206 | } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
207 | ret = ust_app_pid_get_channel_runtime_stats(usess, | |
208 | uchan, usess->consumer, | |
209 | uchan->attr.overwrite, | |
210 | discarded_events, | |
211 | lost_packets); | |
212 | if (ret < 0) { | |
213 | goto end; | |
214 | } | |
215 | *discarded_events += uchan->per_pid_closed_app_discarded; | |
216 | *lost_packets += uchan->per_pid_closed_app_lost; | |
217 | } else { | |
218 | ERR("Unsupported buffer type"); | |
967bc289 | 219 | assert(0); |
fb83fe64 JD |
220 | ret = -1; |
221 | goto end; | |
222 | } | |
223 | ||
224 | end: | |
225 | return ret; | |
226 | } | |
227 | ||
2f77fc4b DG |
228 | /* |
229 | * Fill lttng_channel array of all channels. | |
230 | */ | |
56a37563 | 231 | static void list_lttng_channels(enum lttng_domain_type domain, |
fb83fe64 JD |
232 | struct ltt_session *session, struct lttng_channel *channels, |
233 | struct lttcomm_channel_extended *chan_exts) | |
2f77fc4b | 234 | { |
fb83fe64 | 235 | int i = 0, ret; |
2f77fc4b DG |
236 | struct ltt_kernel_channel *kchan; |
237 | ||
238 | DBG("Listing channels for session %s", session->name); | |
239 | ||
240 | switch (domain) { | |
241 | case LTTNG_DOMAIN_KERNEL: | |
242 | /* Kernel channels */ | |
243 | if (session->kernel_session != NULL) { | |
244 | cds_list_for_each_entry(kchan, | |
245 | &session->kernel_session->channel_list.head, list) { | |
fb83fe64 JD |
246 | uint64_t discarded_events, lost_packets; |
247 | ||
248 | ret = get_kernel_runtime_stats(session, kchan, | |
249 | &discarded_events, &lost_packets); | |
250 | if (ret < 0) { | |
251 | goto end; | |
252 | } | |
2f77fc4b DG |
253 | /* Copy lttng_channel struct to array */ |
254 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
255 | channels[i].enabled = kchan->enabled; | |
fb83fe64 JD |
256 | chan_exts[i].discarded_events = |
257 | discarded_events; | |
258 | chan_exts[i].lost_packets = lost_packets; | |
2f77fc4b DG |
259 | i++; |
260 | } | |
261 | } | |
262 | break; | |
263 | case LTTNG_DOMAIN_UST: | |
264 | { | |
265 | struct lttng_ht_iter iter; | |
266 | struct ltt_ust_channel *uchan; | |
267 | ||
e7fe706f | 268 | rcu_read_lock(); |
2f77fc4b DG |
269 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
270 | &iter.iter, uchan, node.node) { | |
fb83fe64 JD |
271 | uint64_t discarded_events, lost_packets; |
272 | ||
2f77fc4b DG |
273 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); |
274 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
275 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
276 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
277 | channels[i].attr.switch_timer_interval = | |
278 | uchan->attr.switch_timer_interval; | |
279 | channels[i].attr.read_timer_interval = | |
280 | uchan->attr.read_timer_interval; | |
281 | channels[i].enabled = uchan->enabled; | |
2f785fe7 DG |
282 | channels[i].attr.tracefile_size = uchan->tracefile_size; |
283 | channels[i].attr.tracefile_count = uchan->tracefile_count; | |
5e4435a4 JG |
284 | |
285 | /* | |
286 | * Map enum lttng_ust_output to enum lttng_event_output. | |
287 | */ | |
2f77fc4b DG |
288 | switch (uchan->attr.output) { |
289 | case LTTNG_UST_MMAP: | |
2f77fc4b DG |
290 | channels[i].attr.output = LTTNG_EVENT_MMAP; |
291 | break; | |
5e4435a4 JG |
292 | default: |
293 | /* | |
294 | * LTTNG_UST_MMAP is the only supported UST | |
295 | * output mode. | |
296 | */ | |
297 | assert(0); | |
298 | break; | |
2f77fc4b | 299 | } |
fb83fe64 JD |
300 | |
301 | ret = get_ust_runtime_stats(session, uchan, | |
302 | &discarded_events, &lost_packets); | |
303 | if (ret < 0) { | |
304 | break; | |
305 | } | |
306 | chan_exts[i].discarded_events = discarded_events; | |
307 | chan_exts[i].lost_packets = lost_packets; | |
2f77fc4b DG |
308 | i++; |
309 | } | |
e7fe706f | 310 | rcu_read_unlock(); |
2f77fc4b DG |
311 | break; |
312 | } | |
313 | default: | |
314 | break; | |
315 | } | |
fb83fe64 JD |
316 | |
317 | end: | |
318 | return; | |
2f77fc4b DG |
319 | } |
320 | ||
b4e3ceb9 | 321 | static void increment_extended_len(const char *filter_expression, |
795d57ce | 322 | struct lttng_event_exclusion *exclusion, size_t *extended_len) |
b4e3ceb9 PP |
323 | { |
324 | *extended_len += sizeof(struct lttcomm_event_extended_header); | |
325 | ||
326 | if (filter_expression) { | |
327 | *extended_len += strlen(filter_expression) + 1; | |
328 | } | |
795d57ce PP |
329 | |
330 | if (exclusion) { | |
331 | *extended_len += exclusion->count * LTTNG_SYMBOL_NAME_LEN; | |
332 | } | |
b4e3ceb9 PP |
333 | } |
334 | ||
335 | static void append_extended_info(const char *filter_expression, | |
795d57ce | 336 | struct lttng_event_exclusion *exclusion, void **extended_at) |
b4e3ceb9 PP |
337 | { |
338 | struct lttcomm_event_extended_header extended_header; | |
339 | size_t filter_len = 0; | |
795d57ce | 340 | size_t nb_exclusions = 0; |
b4e3ceb9 PP |
341 | |
342 | if (filter_expression) { | |
343 | filter_len = strlen(filter_expression) + 1; | |
344 | } | |
345 | ||
795d57ce PP |
346 | if (exclusion) { |
347 | nb_exclusions = exclusion->count; | |
348 | } | |
349 | ||
350 | /* Set header fields */ | |
b4e3ceb9 | 351 | extended_header.filter_len = filter_len; |
795d57ce PP |
352 | extended_header.nb_exclusions = nb_exclusions; |
353 | ||
354 | /* Copy header */ | |
b4e3ceb9 PP |
355 | memcpy(*extended_at, &extended_header, sizeof(extended_header)); |
356 | *extended_at += sizeof(extended_header); | |
795d57ce PP |
357 | |
358 | /* Copy filter string */ | |
359 | if (filter_expression) { | |
360 | memcpy(*extended_at, filter_expression, filter_len); | |
361 | *extended_at += filter_len; | |
362 | } | |
363 | ||
364 | /* Copy exclusion names */ | |
365 | if (exclusion) { | |
366 | size_t len = nb_exclusions * LTTNG_SYMBOL_NAME_LEN; | |
367 | ||
368 | memcpy(*extended_at, &exclusion->names, len); | |
369 | *extended_at += len; | |
370 | } | |
b4e3ceb9 PP |
371 | } |
372 | ||
3c6a091f | 373 | /* |
022d91ba | 374 | * Create a list of agent domain events. |
3c6a091f DG |
375 | * |
376 | * Return number of events in list on success or else a negative value. | |
377 | */ | |
022d91ba | 378 | static int list_lttng_agent_events(struct agent *agt, |
b4e3ceb9 | 379 | struct lttng_event **events, size_t *total_size) |
3c6a091f DG |
380 | { |
381 | int i = 0, ret = 0; | |
382 | unsigned int nb_event = 0; | |
022d91ba | 383 | struct agent_event *event; |
3c6a091f DG |
384 | struct lttng_event *tmp_events; |
385 | struct lttng_ht_iter iter; | |
b4e3ceb9 PP |
386 | size_t extended_len = 0; |
387 | void *extended_at; | |
3c6a091f | 388 | |
022d91ba | 389 | assert(agt); |
3c6a091f DG |
390 | assert(events); |
391 | ||
022d91ba | 392 | DBG3("Listing agent events"); |
3c6a091f | 393 | |
e5bbf678 | 394 | rcu_read_lock(); |
022d91ba | 395 | nb_event = lttng_ht_get_count(agt->events); |
e5bbf678 | 396 | rcu_read_unlock(); |
3c6a091f DG |
397 | if (nb_event == 0) { |
398 | ret = nb_event; | |
b4e3ceb9 | 399 | *total_size = 0; |
3c6a091f DG |
400 | goto error; |
401 | } | |
402 | ||
b4e3ceb9 PP |
403 | /* Compute required extended infos size */ |
404 | extended_len = nb_event * sizeof(struct lttcomm_event_extended_header); | |
405 | ||
406 | /* | |
407 | * This is only valid because the commands which add events are | |
408 | * processed in the same thread as the listing. | |
409 | */ | |
410 | rcu_read_lock(); | |
411 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { | |
795d57ce PP |
412 | increment_extended_len(event->filter_expression, NULL, |
413 | &extended_len); | |
b4e3ceb9 PP |
414 | } |
415 | rcu_read_unlock(); | |
416 | ||
417 | *total_size = nb_event * sizeof(*tmp_events) + extended_len; | |
418 | tmp_events = zmalloc(*total_size); | |
3c6a091f | 419 | if (!tmp_events) { |
022d91ba | 420 | PERROR("zmalloc agent events session"); |
3c6a091f DG |
421 | ret = -LTTNG_ERR_FATAL; |
422 | goto error; | |
423 | } | |
424 | ||
b4e3ceb9 PP |
425 | extended_at = ((uint8_t *) tmp_events) + |
426 | nb_event * sizeof(struct lttng_event); | |
427 | ||
3c6a091f | 428 | rcu_read_lock(); |
022d91ba | 429 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
3c6a091f DG |
430 | strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name)); |
431 | tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0'; | |
432 | tmp_events[i].enabled = event->enabled; | |
2106efa0 | 433 | tmp_events[i].loglevel = event->loglevel_value; |
ff94328f | 434 | tmp_events[i].loglevel_type = event->loglevel_type; |
3c6a091f | 435 | i++; |
b4e3ceb9 PP |
436 | |
437 | /* Append extended info */ | |
795d57ce PP |
438 | append_extended_info(event->filter_expression, NULL, |
439 | &extended_at); | |
3c6a091f DG |
440 | } |
441 | rcu_read_unlock(); | |
442 | ||
443 | *events = tmp_events; | |
444 | ret = nb_event; | |
445 | ||
446 | error: | |
447 | assert(nb_event == i); | |
448 | return ret; | |
449 | } | |
450 | ||
2f77fc4b DG |
451 | /* |
452 | * Create a list of ust global domain events. | |
453 | */ | |
454 | static int list_lttng_ust_global_events(char *channel_name, | |
b4e3ceb9 PP |
455 | struct ltt_ust_domain_global *ust_global, |
456 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
457 | { |
458 | int i = 0, ret = 0; | |
459 | unsigned int nb_event = 0; | |
460 | struct lttng_ht_iter iter; | |
461 | struct lttng_ht_node_str *node; | |
462 | struct ltt_ust_channel *uchan; | |
463 | struct ltt_ust_event *uevent; | |
464 | struct lttng_event *tmp; | |
b4e3ceb9 PP |
465 | size_t extended_len = 0; |
466 | void *extended_at; | |
2f77fc4b DG |
467 | |
468 | DBG("Listing UST global events for channel %s", channel_name); | |
469 | ||
470 | rcu_read_lock(); | |
471 | ||
472 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); | |
473 | node = lttng_ht_iter_get_node_str(&iter); | |
474 | if (node == NULL) { | |
f73fabfd | 475 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
d31d3e8c | 476 | goto end; |
2f77fc4b DG |
477 | } |
478 | ||
479 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); | |
480 | ||
3c442be3 | 481 | nb_event = lttng_ht_get_count(uchan->events); |
2f77fc4b DG |
482 | if (nb_event == 0) { |
483 | ret = nb_event; | |
b4e3ceb9 | 484 | *total_size = 0; |
d31d3e8c | 485 | goto end; |
2f77fc4b DG |
486 | } |
487 | ||
488 | DBG3("Listing UST global %d events", nb_event); | |
489 | ||
b4e3ceb9 PP |
490 | /* Compute required extended infos size */ |
491 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { | |
492 | if (uevent->internal) { | |
493 | nb_event--; | |
494 | continue; | |
495 | } | |
496 | ||
497 | increment_extended_len(uevent->filter_expression, | |
795d57ce | 498 | uevent->exclusion, &extended_len); |
b4e3ceb9 | 499 | } |
d31d3e8c PP |
500 | if (nb_event == 0) { |
501 | /* All events are internal, skip. */ | |
502 | ret = 0; | |
503 | *total_size = 0; | |
504 | goto end; | |
505 | } | |
b4e3ceb9 PP |
506 | |
507 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
508 | tmp = zmalloc(*total_size); | |
2f77fc4b | 509 | if (tmp == NULL) { |
b12c38df JG |
510 | ret = -LTTNG_ERR_FATAL; |
511 | goto end; | |
2f77fc4b DG |
512 | } |
513 | ||
b4e3ceb9 PP |
514 | extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event); |
515 | ||
2f77fc4b | 516 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
3c442be3 JG |
517 | if (uevent->internal) { |
518 | /* This event should remain hidden from clients */ | |
3c442be3 JG |
519 | continue; |
520 | } | |
2f77fc4b DG |
521 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
522 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
523 | tmp[i].enabled = uevent->enabled; | |
524 | ||
525 | switch (uevent->attr.instrumentation) { | |
526 | case LTTNG_UST_TRACEPOINT: | |
527 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
528 | break; | |
529 | case LTTNG_UST_PROBE: | |
530 | tmp[i].type = LTTNG_EVENT_PROBE; | |
531 | break; | |
532 | case LTTNG_UST_FUNCTION: | |
533 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
534 | break; | |
535 | } | |
536 | ||
537 | tmp[i].loglevel = uevent->attr.loglevel; | |
538 | switch (uevent->attr.loglevel_type) { | |
539 | case LTTNG_UST_LOGLEVEL_ALL: | |
540 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
541 | break; | |
542 | case LTTNG_UST_LOGLEVEL_RANGE: | |
543 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; | |
544 | break; | |
545 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
546 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; | |
547 | break; | |
548 | } | |
549 | if (uevent->filter) { | |
550 | tmp[i].filter = 1; | |
551 | } | |
4634f12e JI |
552 | if (uevent->exclusion) { |
553 | tmp[i].exclusion = 1; | |
554 | } | |
2f77fc4b | 555 | i++; |
b4e3ceb9 PP |
556 | |
557 | /* Append extended info */ | |
795d57ce PP |
558 | append_extended_info(uevent->filter_expression, |
559 | uevent->exclusion, &extended_at); | |
2f77fc4b DG |
560 | } |
561 | ||
562 | ret = nb_event; | |
563 | *events = tmp; | |
d31d3e8c | 564 | end: |
2f77fc4b DG |
565 | rcu_read_unlock(); |
566 | return ret; | |
567 | } | |
568 | ||
569 | /* | |
570 | * Fill lttng_event array of all kernel events in the channel. | |
571 | */ | |
572 | static int list_lttng_kernel_events(char *channel_name, | |
b4e3ceb9 PP |
573 | struct ltt_kernel_session *kernel_session, |
574 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
575 | { |
576 | int i = 0, ret; | |
577 | unsigned int nb_event; | |
578 | struct ltt_kernel_event *event; | |
579 | struct ltt_kernel_channel *kchan; | |
b4e3ceb9 PP |
580 | size_t extended_len = 0; |
581 | void *extended_at; | |
2f77fc4b DG |
582 | |
583 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
584 | if (kchan == NULL) { | |
f73fabfd | 585 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
586 | goto error; |
587 | } | |
588 | ||
589 | nb_event = kchan->event_count; | |
590 | ||
591 | DBG("Listing events for channel %s", kchan->channel->name); | |
592 | ||
593 | if (nb_event == 0) { | |
b4e3ceb9 | 594 | *total_size = 0; |
834978fd | 595 | *events = NULL; |
db906c12 | 596 | goto end; |
2f77fc4b DG |
597 | } |
598 | ||
b4e3ceb9 PP |
599 | /* Compute required extended infos size */ |
600 | cds_list_for_each_entry(event, &kchan->events_list.head, list) { | |
795d57ce PP |
601 | increment_extended_len(event->filter_expression, NULL, |
602 | &extended_len); | |
b4e3ceb9 PP |
603 | } |
604 | ||
605 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
606 | *events = zmalloc(*total_size); | |
2f77fc4b | 607 | if (*events == NULL) { |
f73fabfd | 608 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
609 | goto error; |
610 | } | |
611 | ||
ab4aa612 | 612 | extended_at = ((void *) *events) + |
b4e3ceb9 PP |
613 | nb_event * sizeof(struct lttng_event); |
614 | ||
2f77fc4b DG |
615 | /* Kernel channels */ |
616 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
617 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
618 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
619 | (*events)[i].enabled = event->enabled; | |
00f992f2 JG |
620 | (*events)[i].filter = |
621 | (unsigned char) !!event->filter_expression; | |
2f77fc4b DG |
622 | |
623 | switch (event->event->instrumentation) { | |
624 | case LTTNG_KERNEL_TRACEPOINT: | |
625 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; | |
626 | break; | |
2f77fc4b | 627 | case LTTNG_KERNEL_KRETPROBE: |
1896972b DG |
628 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
629 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
630 | sizeof(struct lttng_kernel_kprobe)); | |
631 | break; | |
632 | case LTTNG_KERNEL_KPROBE: | |
2f77fc4b DG |
633 | (*events)[i].type = LTTNG_EVENT_PROBE; |
634 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
635 | sizeof(struct lttng_kernel_kprobe)); | |
636 | break; | |
637 | case LTTNG_KERNEL_FUNCTION: | |
638 | (*events)[i].type = LTTNG_EVENT_FUNCTION; | |
639 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
640 | sizeof(struct lttng_kernel_function)); | |
641 | break; | |
642 | case LTTNG_KERNEL_NOOP: | |
643 | (*events)[i].type = LTTNG_EVENT_NOOP; | |
644 | break; | |
645 | case LTTNG_KERNEL_SYSCALL: | |
646 | (*events)[i].type = LTTNG_EVENT_SYSCALL; | |
647 | break; | |
648 | case LTTNG_KERNEL_ALL: | |
649 | assert(0); | |
650 | break; | |
651 | } | |
652 | i++; | |
b4e3ceb9 PP |
653 | |
654 | /* Append extended info */ | |
795d57ce PP |
655 | append_extended_info(event->filter_expression, NULL, |
656 | &extended_at); | |
2f77fc4b DG |
657 | } |
658 | ||
db906c12 | 659 | end: |
2f77fc4b DG |
660 | return nb_event; |
661 | ||
662 | error: | |
f73fabfd DG |
663 | /* Negate the error code to differentiate the size from an error */ |
664 | return -ret; | |
2f77fc4b DG |
665 | } |
666 | ||
667 | /* | |
668 | * Add URI so the consumer output object. Set the correct path depending on the | |
669 | * domain adding the default trace directory. | |
670 | */ | |
671 | static int add_uri_to_consumer(struct consumer_output *consumer, | |
56a37563 JG |
672 | struct lttng_uri *uri, enum lttng_domain_type domain, |
673 | const char *session_name) | |
2f77fc4b | 674 | { |
f73fabfd | 675 | int ret = LTTNG_OK; |
2f77fc4b DG |
676 | const char *default_trace_dir; |
677 | ||
678 | assert(uri); | |
679 | ||
680 | if (consumer == NULL) { | |
681 | DBG("No consumer detected. Don't add URI. Stopping."); | |
f73fabfd | 682 | ret = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
683 | goto error; |
684 | } | |
685 | ||
686 | switch (domain) { | |
687 | case LTTNG_DOMAIN_KERNEL: | |
688 | default_trace_dir = DEFAULT_KERNEL_TRACE_DIR; | |
689 | break; | |
690 | case LTTNG_DOMAIN_UST: | |
691 | default_trace_dir = DEFAULT_UST_TRACE_DIR; | |
692 | break; | |
693 | default: | |
694 | /* | |
695 | * This case is possible is we try to add the URI to the global tracing | |
696 | * session consumer object which in this case there is no subdir. | |
697 | */ | |
698 | default_trace_dir = ""; | |
699 | } | |
700 | ||
701 | switch (uri->dtype) { | |
702 | case LTTNG_DST_IPV4: | |
703 | case LTTNG_DST_IPV6: | |
704 | DBG2("Setting network URI to consumer"); | |
705 | ||
df75acac DG |
706 | if (consumer->type == CONSUMER_DST_NET) { |
707 | if ((uri->stype == LTTNG_STREAM_CONTROL && | |
785d2d0d DG |
708 | consumer->dst.net.control_isset) || |
709 | (uri->stype == LTTNG_STREAM_DATA && | |
710 | consumer->dst.net.data_isset)) { | |
df75acac DG |
711 | ret = LTTNG_ERR_URL_EXIST; |
712 | goto error; | |
713 | } | |
714 | } else { | |
715 | memset(&consumer->dst.net, 0, sizeof(consumer->dst.net)); | |
785d2d0d DG |
716 | } |
717 | ||
df75acac DG |
718 | consumer->type = CONSUMER_DST_NET; |
719 | ||
2f77fc4b DG |
720 | /* Set URI into consumer output object */ |
721 | ret = consumer_set_network_uri(consumer, uri); | |
722 | if (ret < 0) { | |
a74934ba | 723 | ret = -ret; |
2f77fc4b DG |
724 | goto error; |
725 | } else if (ret == 1) { | |
726 | /* | |
727 | * URI was the same in the consumer so we do not append the subdir | |
728 | * again so to not duplicate output dir. | |
729 | */ | |
f86c9f4e | 730 | ret = LTTNG_OK; |
2f77fc4b DG |
731 | goto error; |
732 | } | |
733 | ||
734 | if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) { | |
735 | ret = consumer_set_subdir(consumer, session_name); | |
736 | if (ret < 0) { | |
f73fabfd | 737 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
738 | goto error; |
739 | } | |
740 | } | |
741 | ||
742 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
743 | /* On a new subdir, reappend the default trace dir. */ | |
c30ce0b3 CB |
744 | strncat(consumer->subdir, default_trace_dir, |
745 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
746 | DBG3("Append domain trace name to subdir %s", consumer->subdir); |
747 | } | |
748 | ||
749 | break; | |
750 | case LTTNG_DST_PATH: | |
751 | DBG2("Setting trace directory path from URI to %s", uri->dst.path); | |
752 | memset(consumer->dst.trace_path, 0, | |
753 | sizeof(consumer->dst.trace_path)); | |
754 | strncpy(consumer->dst.trace_path, uri->dst.path, | |
755 | sizeof(consumer->dst.trace_path)); | |
756 | /* Append default trace dir */ | |
757 | strncat(consumer->dst.trace_path, default_trace_dir, | |
c30ce0b3 CB |
758 | sizeof(consumer->dst.trace_path) - |
759 | strlen(consumer->dst.trace_path) - 1); | |
2f77fc4b DG |
760 | /* Flag consumer as local. */ |
761 | consumer->type = CONSUMER_DST_LOCAL; | |
762 | break; | |
763 | } | |
764 | ||
a74934ba DG |
765 | ret = LTTNG_OK; |
766 | ||
2f77fc4b DG |
767 | error: |
768 | return ret; | |
769 | } | |
770 | ||
771 | /* | |
772 | * Init tracing by creating trace directory and sending fds kernel consumer. | |
773 | */ | |
774 | static int init_kernel_tracing(struct ltt_kernel_session *session) | |
775 | { | |
776 | int ret = 0; | |
777 | struct lttng_ht_iter iter; | |
778 | struct consumer_socket *socket; | |
779 | ||
780 | assert(session); | |
781 | ||
e7fe706f DG |
782 | rcu_read_lock(); |
783 | ||
2f77fc4b DG |
784 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { |
785 | cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter, | |
786 | socket, node.node) { | |
2f77fc4b | 787 | pthread_mutex_lock(socket->lock); |
f50f23d9 | 788 | ret = kernel_consumer_send_session(socket, session); |
2f77fc4b DG |
789 | pthread_mutex_unlock(socket->lock); |
790 | if (ret < 0) { | |
f73fabfd | 791 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
792 | goto error; |
793 | } | |
794 | } | |
795 | } | |
796 | ||
797 | error: | |
e7fe706f | 798 | rcu_read_unlock(); |
2f77fc4b DG |
799 | return ret; |
800 | } | |
801 | ||
802 | /* | |
803 | * Create a socket to the relayd using the URI. | |
804 | * | |
805 | * On success, the relayd_sock pointer is set to the created socket. | |
806 | * Else, it's stays untouched and a lttcomm error code is returned. | |
807 | */ | |
6151a90f | 808 | static int create_connect_relayd(struct lttng_uri *uri, |
b31610f2 JD |
809 | struct lttcomm_relayd_sock **relayd_sock, |
810 | struct consumer_output *consumer) | |
2f77fc4b DG |
811 | { |
812 | int ret; | |
6151a90f | 813 | struct lttcomm_relayd_sock *rsock; |
2f77fc4b | 814 | |
6151a90f JD |
815 | rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR, |
816 | RELAYD_VERSION_COMM_MINOR); | |
817 | if (!rsock) { | |
f73fabfd | 818 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
819 | goto error; |
820 | } | |
821 | ||
ffe60014 DG |
822 | /* |
823 | * Connect to relayd so we can proceed with a session creation. This call | |
824 | * can possibly block for an arbitrary amount of time to set the health | |
825 | * state to be in poll execution. | |
826 | */ | |
827 | health_poll_entry(); | |
6151a90f | 828 | ret = relayd_connect(rsock); |
ffe60014 | 829 | health_poll_exit(); |
2f77fc4b DG |
830 | if (ret < 0) { |
831 | ERR("Unable to reach lttng-relayd"); | |
f73fabfd | 832 | ret = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
833 | goto free_sock; |
834 | } | |
835 | ||
836 | /* Create socket for control stream. */ | |
837 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
838 | DBG3("Creating relayd stream socket from URI"); | |
839 | ||
840 | /* Check relayd version */ | |
6151a90f | 841 | ret = relayd_version_check(rsock); |
2f77fc4b | 842 | if (ret < 0) { |
f73fabfd | 843 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; |
2f77fc4b DG |
844 | goto close_sock; |
845 | } | |
b31610f2 JD |
846 | consumer->relay_major_version = rsock->major; |
847 | consumer->relay_minor_version = rsock->minor; | |
2f77fc4b DG |
848 | } else if (uri->stype == LTTNG_STREAM_DATA) { |
849 | DBG3("Creating relayd data socket from URI"); | |
850 | } else { | |
851 | /* Command is not valid */ | |
852 | ERR("Relayd invalid stream type: %d", uri->stype); | |
f73fabfd | 853 | ret = LTTNG_ERR_INVALID; |
2f77fc4b DG |
854 | goto close_sock; |
855 | } | |
856 | ||
6151a90f | 857 | *relayd_sock = rsock; |
2f77fc4b | 858 | |
f73fabfd | 859 | return LTTNG_OK; |
2f77fc4b DG |
860 | |
861 | close_sock: | |
6151a90f JD |
862 | /* The returned value is not useful since we are on an error path. */ |
863 | (void) relayd_close(rsock); | |
2f77fc4b | 864 | free_sock: |
6151a90f | 865 | free(rsock); |
2f77fc4b DG |
866 | error: |
867 | return ret; | |
868 | } | |
869 | ||
870 | /* | |
871 | * Connect to the relayd using URI and send the socket to the right consumer. | |
872 | */ | |
56a37563 JG |
873 | static int send_consumer_relayd_socket(enum lttng_domain_type domain, |
874 | unsigned int session_id, struct lttng_uri *relayd_uri, | |
875 | struct consumer_output *consumer, | |
d3e2ba59 JD |
876 | struct consumer_socket *consumer_sock, |
877 | char *session_name, char *hostname, int session_live_timer) | |
2f77fc4b DG |
878 | { |
879 | int ret; | |
6151a90f | 880 | struct lttcomm_relayd_sock *rsock = NULL; |
2f77fc4b | 881 | |
ffe60014 | 882 | /* Connect to relayd and make version check if uri is the control. */ |
b31610f2 | 883 | ret = create_connect_relayd(relayd_uri, &rsock, consumer); |
ffe60014 | 884 | if (ret != LTTNG_OK) { |
6151a90f | 885 | goto error; |
ffe60014 | 886 | } |
6151a90f | 887 | assert(rsock); |
ffe60014 | 888 | |
2f77fc4b | 889 | /* Set the network sequence index if not set. */ |
d88aee68 DG |
890 | if (consumer->net_seq_index == (uint64_t) -1ULL) { |
891 | pthread_mutex_lock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
892 | /* |
893 | * Increment net_seq_idx because we are about to transfer the | |
894 | * new relayd socket to the consumer. | |
d88aee68 | 895 | * Assign unique key so the consumer can match streams. |
2f77fc4b | 896 | */ |
d88aee68 DG |
897 | consumer->net_seq_index = ++relayd_net_seq_idx; |
898 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
899 | } |
900 | ||
2f77fc4b | 901 | /* Send relayd socket to consumer. */ |
6151a90f | 902 | ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer, |
d3e2ba59 JD |
903 | relayd_uri->stype, session_id, |
904 | session_name, hostname, session_live_timer); | |
2f77fc4b | 905 | if (ret < 0) { |
f73fabfd | 906 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
907 | goto close_sock; |
908 | } | |
909 | ||
c890b720 DG |
910 | /* Flag that the corresponding socket was sent. */ |
911 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
ffe60014 | 912 | consumer_sock->control_sock_sent = 1; |
c890b720 | 913 | } else if (relayd_uri->stype == LTTNG_STREAM_DATA) { |
ffe60014 | 914 | consumer_sock->data_sock_sent = 1; |
c890b720 DG |
915 | } |
916 | ||
f73fabfd | 917 | ret = LTTNG_OK; |
2f77fc4b DG |
918 | |
919 | /* | |
920 | * Close socket which was dup on the consumer side. The session daemon does | |
921 | * NOT keep track of the relayd socket(s) once transfer to the consumer. | |
922 | */ | |
923 | ||
924 | close_sock: | |
6151a90f JD |
925 | (void) relayd_close(rsock); |
926 | free(rsock); | |
2f77fc4b | 927 | |
6151a90f | 928 | error: |
ffe60014 DG |
929 | if (ret != LTTNG_OK) { |
930 | /* | |
d9078d0c DG |
931 | * The consumer output for this session should not be used anymore |
932 | * since the relayd connection failed thus making any tracing or/and | |
933 | * streaming not usable. | |
ffe60014 | 934 | */ |
d9078d0c | 935 | consumer->enabled = 0; |
ffe60014 | 936 | } |
2f77fc4b DG |
937 | return ret; |
938 | } | |
939 | ||
940 | /* | |
941 | * Send both relayd sockets to a specific consumer and domain. This is a | |
942 | * helper function to facilitate sending the information to the consumer for a | |
943 | * session. | |
944 | */ | |
56a37563 JG |
945 | static int send_consumer_relayd_sockets(enum lttng_domain_type domain, |
946 | unsigned int session_id, struct consumer_output *consumer, | |
947 | struct consumer_socket *sock, char *session_name, | |
948 | char *hostname, int session_live_timer) | |
2f77fc4b | 949 | { |
dda67f6c | 950 | int ret = LTTNG_OK; |
2f77fc4b | 951 | |
2f77fc4b | 952 | assert(consumer); |
6dc3064a | 953 | assert(sock); |
2f77fc4b | 954 | |
2f77fc4b | 955 | /* Sending control relayd socket. */ |
ffe60014 | 956 | if (!sock->control_sock_sent) { |
6dc3064a | 957 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
958 | &consumer->dst.net.control, consumer, sock, |
959 | session_name, hostname, session_live_timer); | |
c890b720 DG |
960 | if (ret != LTTNG_OK) { |
961 | goto error; | |
962 | } | |
2f77fc4b DG |
963 | } |
964 | ||
965 | /* Sending data relayd socket. */ | |
ffe60014 | 966 | if (!sock->data_sock_sent) { |
6dc3064a | 967 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
968 | &consumer->dst.net.data, consumer, sock, |
969 | session_name, hostname, session_live_timer); | |
c890b720 DG |
970 | if (ret != LTTNG_OK) { |
971 | goto error; | |
972 | } | |
2f77fc4b DG |
973 | } |
974 | ||
2f77fc4b DG |
975 | error: |
976 | return ret; | |
977 | } | |
978 | ||
979 | /* | |
980 | * Setup relayd connections for a tracing session. First creates the socket to | |
981 | * the relayd and send them to the right domain consumer. Consumer type MUST be | |
982 | * network. | |
983 | */ | |
ffe60014 | 984 | int cmd_setup_relayd(struct ltt_session *session) |
2f77fc4b | 985 | { |
f73fabfd | 986 | int ret = LTTNG_OK; |
2f77fc4b DG |
987 | struct ltt_ust_session *usess; |
988 | struct ltt_kernel_session *ksess; | |
989 | struct consumer_socket *socket; | |
990 | struct lttng_ht_iter iter; | |
991 | ||
992 | assert(session); | |
993 | ||
994 | usess = session->ust_session; | |
995 | ksess = session->kernel_session; | |
996 | ||
785d2d0d | 997 | DBG("Setting relayd for session %s", session->name); |
2f77fc4b | 998 | |
e7fe706f DG |
999 | rcu_read_lock(); |
1000 | ||
2f77fc4b DG |
1001 | if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET |
1002 | && usess->consumer->enabled) { | |
1003 | /* For each consumer socket, send relayd sockets */ | |
1004 | cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, | |
1005 | socket, node.node) { | |
2f77fc4b | 1006 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1007 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id, |
d3e2ba59 JD |
1008 | usess->consumer, socket, |
1009 | session->name, session->hostname, | |
1010 | session->live_timer); | |
2f77fc4b | 1011 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1012 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1013 | goto error; |
1014 | } | |
6dc3064a DG |
1015 | /* Session is now ready for network streaming. */ |
1016 | session->net_handle = 1; | |
2f77fc4b | 1017 | } |
b31610f2 JD |
1018 | session->consumer->relay_major_version = |
1019 | usess->consumer->relay_major_version; | |
1020 | session->consumer->relay_minor_version = | |
1021 | usess->consumer->relay_minor_version; | |
2f77fc4b DG |
1022 | } |
1023 | ||
1024 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET | |
1025 | && ksess->consumer->enabled) { | |
1026 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1027 | socket, node.node) { | |
2f77fc4b | 1028 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1029 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id, |
d3e2ba59 JD |
1030 | ksess->consumer, socket, |
1031 | session->name, session->hostname, | |
1032 | session->live_timer); | |
2f77fc4b | 1033 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1034 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1035 | goto error; |
1036 | } | |
6dc3064a DG |
1037 | /* Session is now ready for network streaming. */ |
1038 | session->net_handle = 1; | |
2f77fc4b | 1039 | } |
b31610f2 JD |
1040 | session->consumer->relay_major_version = |
1041 | ksess->consumer->relay_major_version; | |
1042 | session->consumer->relay_minor_version = | |
1043 | ksess->consumer->relay_minor_version; | |
2f77fc4b DG |
1044 | } |
1045 | ||
1046 | error: | |
e7fe706f | 1047 | rcu_read_unlock(); |
2f77fc4b DG |
1048 | return ret; |
1049 | } | |
1050 | ||
9b6c7ec5 DG |
1051 | /* |
1052 | * Start a kernel session by opening all necessary streams. | |
1053 | */ | |
1054 | static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe) | |
1055 | { | |
1056 | int ret; | |
1057 | struct ltt_kernel_channel *kchan; | |
1058 | ||
1059 | /* Open kernel metadata */ | |
07b86b52 | 1060 | if (ksess->metadata == NULL && ksess->output_traces) { |
9b6c7ec5 DG |
1061 | ret = kernel_open_metadata(ksess); |
1062 | if (ret < 0) { | |
1063 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1064 | goto error; | |
1065 | } | |
1066 | } | |
1067 | ||
1068 | /* Open kernel metadata stream */ | |
07b86b52 | 1069 | if (ksess->metadata && ksess->metadata_stream_fd < 0) { |
9b6c7ec5 DG |
1070 | ret = kernel_open_metadata_stream(ksess); |
1071 | if (ret < 0) { | |
1072 | ERR("Kernel create metadata stream failed"); | |
1073 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1074 | goto error; | |
1075 | } | |
1076 | } | |
1077 | ||
1078 | /* For each channel */ | |
1079 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
1080 | if (kchan->stream_count == 0) { | |
1081 | ret = kernel_open_channel_stream(kchan); | |
1082 | if (ret < 0) { | |
1083 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1084 | goto error; | |
1085 | } | |
1086 | /* Update the stream global counter */ | |
1087 | ksess->stream_count_global += ret; | |
1088 | } | |
1089 | } | |
1090 | ||
1091 | /* Setup kernel consumer socket and send fds to it */ | |
1092 | ret = init_kernel_tracing(ksess); | |
e43c41c5 | 1093 | if (ret != 0) { |
9b6c7ec5 DG |
1094 | ret = LTTNG_ERR_KERN_START_FAIL; |
1095 | goto error; | |
1096 | } | |
1097 | ||
1098 | /* This start the kernel tracing */ | |
1099 | ret = kernel_start_session(ksess); | |
1100 | if (ret < 0) { | |
1101 | ret = LTTNG_ERR_KERN_START_FAIL; | |
1102 | goto error; | |
1103 | } | |
1104 | ||
1105 | /* Quiescent wait after starting trace */ | |
784303b0 | 1106 | kernel_wait_quiescent(kernel_tracer_fd); |
9b6c7ec5 | 1107 | |
14fb1ebe | 1108 | ksess->active = 1; |
9b6c7ec5 DG |
1109 | |
1110 | ret = LTTNG_OK; | |
1111 | ||
1112 | error: | |
1113 | return ret; | |
1114 | } | |
1115 | ||
2f77fc4b DG |
1116 | /* |
1117 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. | |
1118 | */ | |
56a37563 JG |
1119 | int cmd_disable_channel(struct ltt_session *session, |
1120 | enum lttng_domain_type domain, char *channel_name) | |
2f77fc4b DG |
1121 | { |
1122 | int ret; | |
1123 | struct ltt_ust_session *usess; | |
1124 | ||
1125 | usess = session->ust_session; | |
1126 | ||
2223c96f DG |
1127 | rcu_read_lock(); |
1128 | ||
2f77fc4b DG |
1129 | switch (domain) { |
1130 | case LTTNG_DOMAIN_KERNEL: | |
1131 | { | |
1132 | ret = channel_kernel_disable(session->kernel_session, | |
1133 | channel_name); | |
f73fabfd | 1134 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1135 | goto error; |
1136 | } | |
1137 | ||
1138 | kernel_wait_quiescent(kernel_tracer_fd); | |
1139 | break; | |
1140 | } | |
1141 | case LTTNG_DOMAIN_UST: | |
1142 | { | |
1143 | struct ltt_ust_channel *uchan; | |
1144 | struct lttng_ht *chan_ht; | |
1145 | ||
1146 | chan_ht = usess->domain_global.channels; | |
1147 | ||
1148 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
1149 | if (uchan == NULL) { | |
f73fabfd | 1150 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
1151 | goto error; |
1152 | } | |
1153 | ||
7972aab2 | 1154 | ret = channel_ust_disable(usess, uchan); |
f73fabfd | 1155 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1156 | goto error; |
1157 | } | |
1158 | break; | |
1159 | } | |
2f77fc4b | 1160 | default: |
f73fabfd | 1161 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1162 | goto error; |
1163 | } | |
1164 | ||
f73fabfd | 1165 | ret = LTTNG_OK; |
2f77fc4b DG |
1166 | |
1167 | error: | |
2223c96f | 1168 | rcu_read_unlock(); |
2f77fc4b DG |
1169 | return ret; |
1170 | } | |
1171 | ||
ccf10263 MD |
1172 | /* |
1173 | * Command LTTNG_TRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1174 | * |
1175 | * Called with session lock held. | |
ccf10263 | 1176 | */ |
56a37563 JG |
1177 | int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1178 | int pid) | |
ccf10263 MD |
1179 | { |
1180 | int ret; | |
1181 | ||
1182 | rcu_read_lock(); | |
1183 | ||
1184 | switch (domain) { | |
1185 | case LTTNG_DOMAIN_KERNEL: | |
1186 | { | |
1187 | struct ltt_kernel_session *ksess; | |
1188 | ||
1189 | ksess = session->kernel_session; | |
1190 | ||
1191 | ret = kernel_track_pid(ksess, pid); | |
1192 | if (ret != LTTNG_OK) { | |
1193 | goto error; | |
1194 | } | |
1195 | ||
1196 | kernel_wait_quiescent(kernel_tracer_fd); | |
1197 | break; | |
1198 | } | |
ccf10263 | 1199 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1200 | { |
1201 | struct ltt_ust_session *usess; | |
1202 | ||
1203 | usess = session->ust_session; | |
1204 | ||
1205 | ret = trace_ust_track_pid(usess, pid); | |
1206 | if (ret != LTTNG_OK) { | |
1207 | goto error; | |
1208 | } | |
1209 | break; | |
1210 | } | |
ccf10263 MD |
1211 | default: |
1212 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1213 | goto error; | |
1214 | } | |
1215 | ||
1216 | ret = LTTNG_OK; | |
1217 | ||
1218 | error: | |
1219 | rcu_read_unlock(); | |
1220 | return ret; | |
1221 | } | |
1222 | ||
1223 | /* | |
1224 | * Command LTTNG_UNTRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1225 | * |
1226 | * Called with session lock held. | |
ccf10263 | 1227 | */ |
56a37563 JG |
1228 | int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1229 | int pid) | |
ccf10263 MD |
1230 | { |
1231 | int ret; | |
1232 | ||
1233 | rcu_read_lock(); | |
1234 | ||
1235 | switch (domain) { | |
1236 | case LTTNG_DOMAIN_KERNEL: | |
1237 | { | |
1238 | struct ltt_kernel_session *ksess; | |
1239 | ||
1240 | ksess = session->kernel_session; | |
1241 | ||
1242 | ret = kernel_untrack_pid(ksess, pid); | |
1243 | if (ret != LTTNG_OK) { | |
1244 | goto error; | |
1245 | } | |
1246 | ||
1247 | kernel_wait_quiescent(kernel_tracer_fd); | |
1248 | break; | |
1249 | } | |
ccf10263 | 1250 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1251 | { |
1252 | struct ltt_ust_session *usess; | |
1253 | ||
1254 | usess = session->ust_session; | |
1255 | ||
1256 | ret = trace_ust_untrack_pid(usess, pid); | |
1257 | if (ret != LTTNG_OK) { | |
1258 | goto error; | |
1259 | } | |
1260 | break; | |
1261 | } | |
ccf10263 MD |
1262 | default: |
1263 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1264 | goto error; | |
1265 | } | |
1266 | ||
1267 | ret = LTTNG_OK; | |
1268 | ||
1269 | error: | |
1270 | rcu_read_unlock(); | |
1271 | return ret; | |
1272 | } | |
1273 | ||
2f77fc4b DG |
1274 | /* |
1275 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
1276 | * | |
1277 | * The wpipe arguments is used as a notifier for the kernel thread. | |
1278 | */ | |
1279 | int cmd_enable_channel(struct ltt_session *session, | |
7972aab2 | 1280 | struct lttng_domain *domain, struct lttng_channel *attr, int wpipe) |
2f77fc4b DG |
1281 | { |
1282 | int ret; | |
1283 | struct ltt_ust_session *usess = session->ust_session; | |
1284 | struct lttng_ht *chan_ht; | |
1f345e94 | 1285 | size_t len; |
2f77fc4b DG |
1286 | |
1287 | assert(session); | |
1288 | assert(attr); | |
7972aab2 | 1289 | assert(domain); |
2f77fc4b | 1290 | |
f5436bfc | 1291 | len = lttng_strnlen(attr->name, sizeof(attr->name)); |
1f345e94 PP |
1292 | |
1293 | /* Validate channel name */ | |
1294 | if (attr->name[0] == '.' || | |
1295 | memchr(attr->name, '/', len) != NULL) { | |
1296 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1297 | goto end; | |
1298 | } | |
1299 | ||
2f77fc4b DG |
1300 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
1301 | ||
03b4fdcf DG |
1302 | rcu_read_lock(); |
1303 | ||
ecc48a90 JD |
1304 | /* |
1305 | * Don't try to enable a channel if the session has been started at | |
1306 | * some point in time before. The tracer does not allow it. | |
1307 | */ | |
8382cf6f | 1308 | if (session->has_been_started) { |
ecc48a90 JD |
1309 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
1310 | goto error; | |
1311 | } | |
1312 | ||
1313 | /* | |
1314 | * If the session is a live session, remove the switch timer, the | |
1315 | * live timer does the same thing but sends also synchronisation | |
1316 | * beacons for inactive streams. | |
1317 | */ | |
1318 | if (session->live_timer > 0) { | |
1319 | attr->attr.live_timer_interval = session->live_timer; | |
1320 | attr->attr.switch_timer_interval = 0; | |
1321 | } | |
1322 | ||
33fbd469 DG |
1323 | /* |
1324 | * The ringbuffer (both in user space and kernel) behave badly in overwrite | |
1325 | * mode and with less than 2 subbuf so block it right away and send back an | |
1326 | * invalid attribute error. | |
1327 | */ | |
1328 | if (attr->attr.overwrite && attr->attr.num_subbuf < 2) { | |
1329 | ret = LTTNG_ERR_INVALID; | |
1330 | goto error; | |
1331 | } | |
1332 | ||
7972aab2 | 1333 | switch (domain->type) { |
2f77fc4b DG |
1334 | case LTTNG_DOMAIN_KERNEL: |
1335 | { | |
1336 | struct ltt_kernel_channel *kchan; | |
1337 | ||
2f77fc4b DG |
1338 | kchan = trace_kernel_get_channel_by_name(attr->name, |
1339 | session->kernel_session); | |
1340 | if (kchan == NULL) { | |
1341 | ret = channel_kernel_create(session->kernel_session, attr, wpipe); | |
85076754 MD |
1342 | if (attr->name[0] != '\0') { |
1343 | session->kernel_session->has_non_default_channel = 1; | |
1344 | } | |
2f77fc4b DG |
1345 | } else { |
1346 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
1347 | } | |
1348 | ||
f73fabfd | 1349 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1350 | goto error; |
1351 | } | |
1352 | ||
784303b0 | 1353 | kernel_wait_quiescent(kernel_tracer_fd); |
2f77fc4b DG |
1354 | break; |
1355 | } | |
1356 | case LTTNG_DOMAIN_UST: | |
9232818f JG |
1357 | case LTTNG_DOMAIN_JUL: |
1358 | case LTTNG_DOMAIN_LOG4J: | |
1359 | case LTTNG_DOMAIN_PYTHON: | |
2f77fc4b DG |
1360 | { |
1361 | struct ltt_ust_channel *uchan; | |
1362 | ||
9232818f JG |
1363 | /* |
1364 | * FIXME | |
1365 | * | |
1366 | * Current agent implementation limitations force us to allow | |
1367 | * only one channel at once in "agent" subdomains. Each | |
1368 | * subdomain has a default channel name which must be strictly | |
1369 | * adhered to. | |
1370 | */ | |
1371 | if (domain->type == LTTNG_DOMAIN_JUL) { | |
1372 | if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME, | |
1373 | LTTNG_SYMBOL_NAME_LEN)) { | |
1374 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1375 | goto error; | |
1376 | } | |
1377 | } else if (domain->type == LTTNG_DOMAIN_LOG4J) { | |
1378 | if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME, | |
1379 | LTTNG_SYMBOL_NAME_LEN)) { | |
1380 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1381 | goto error; | |
1382 | } | |
1383 | } else if (domain->type == LTTNG_DOMAIN_PYTHON) { | |
1384 | if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME, | |
1385 | LTTNG_SYMBOL_NAME_LEN)) { | |
1386 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1387 | goto error; | |
1388 | } | |
1389 | } | |
1390 | ||
2f77fc4b DG |
1391 | chan_ht = usess->domain_global.channels; |
1392 | ||
1393 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); | |
1394 | if (uchan == NULL) { | |
7972aab2 | 1395 | ret = channel_ust_create(usess, attr, domain->buf_type); |
85076754 MD |
1396 | if (attr->name[0] != '\0') { |
1397 | usess->has_non_default_channel = 1; | |
1398 | } | |
2f77fc4b | 1399 | } else { |
7972aab2 | 1400 | ret = channel_ust_enable(usess, uchan); |
2f77fc4b DG |
1401 | } |
1402 | break; | |
1403 | } | |
2f77fc4b | 1404 | default: |
f73fabfd | 1405 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1406 | goto error; |
1407 | } | |
1408 | ||
1409 | error: | |
2223c96f | 1410 | rcu_read_unlock(); |
1f345e94 | 1411 | end: |
2f77fc4b DG |
1412 | return ret; |
1413 | } | |
1414 | ||
2f77fc4b DG |
1415 | /* |
1416 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1417 | */ | |
56a37563 JG |
1418 | int cmd_disable_event(struct ltt_session *session, |
1419 | enum lttng_domain_type domain, char *channel_name, | |
6e911cad | 1420 | struct lttng_event *event) |
2f77fc4b DG |
1421 | { |
1422 | int ret; | |
6e911cad MD |
1423 | char *event_name; |
1424 | ||
18a720cd MD |
1425 | DBG("Disable event command for event \'%s\'", event->name); |
1426 | ||
6e911cad | 1427 | event_name = event->name; |
7076b56e JG |
1428 | if (validate_event_name(event_name)) { |
1429 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1430 | goto error; | |
1431 | } | |
6e911cad | 1432 | |
9b7431cf JG |
1433 | /* Error out on unhandled search criteria */ |
1434 | if (event->loglevel_type || event->loglevel != -1 || event->enabled | |
6e911cad | 1435 | || event->pid || event->filter || event->exclusion) { |
7076b56e JG |
1436 | ret = LTTNG_ERR_UNK; |
1437 | goto error; | |
6e911cad | 1438 | } |
2f77fc4b | 1439 | |
2223c96f DG |
1440 | rcu_read_lock(); |
1441 | ||
2f77fc4b DG |
1442 | switch (domain) { |
1443 | case LTTNG_DOMAIN_KERNEL: | |
1444 | { | |
1445 | struct ltt_kernel_channel *kchan; | |
1446 | struct ltt_kernel_session *ksess; | |
1447 | ||
1448 | ksess = session->kernel_session; | |
1449 | ||
85076754 MD |
1450 | /* |
1451 | * If a non-default channel has been created in the | |
1452 | * session, explicitely require that -c chan_name needs | |
1453 | * to be provided. | |
1454 | */ | |
1455 | if (ksess->has_non_default_channel && channel_name[0] == '\0') { | |
1456 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1457 | goto error_unlock; |
85076754 MD |
1458 | } |
1459 | ||
2f77fc4b DG |
1460 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
1461 | if (kchan == NULL) { | |
f73fabfd | 1462 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
7076b56e | 1463 | goto error_unlock; |
2f77fc4b DG |
1464 | } |
1465 | ||
6e911cad MD |
1466 | switch (event->type) { |
1467 | case LTTNG_EVENT_ALL: | |
9550ee81 | 1468 | case LTTNG_EVENT_TRACEPOINT: |
d0ae4ea8 | 1469 | case LTTNG_EVENT_SYSCALL: |
9550ee81 JR |
1470 | case LTTNG_EVENT_PROBE: |
1471 | case LTTNG_EVENT_FUNCTION: | |
1472 | case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */ | |
1473 | if (event_name[0] == '\0') { | |
1474 | ret = event_kernel_disable_event(kchan, | |
1475 | NULL, event->type); | |
29c62722 | 1476 | } else { |
d0ae4ea8 | 1477 | ret = event_kernel_disable_event(kchan, |
9550ee81 | 1478 | event_name, event->type); |
29c62722 | 1479 | } |
6e911cad | 1480 | if (ret != LTTNG_OK) { |
7076b56e | 1481 | goto error_unlock; |
6e911cad MD |
1482 | } |
1483 | break; | |
6e911cad MD |
1484 | default: |
1485 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1486 | goto error_unlock; |
2f77fc4b DG |
1487 | } |
1488 | ||
1489 | kernel_wait_quiescent(kernel_tracer_fd); | |
1490 | break; | |
1491 | } | |
1492 | case LTTNG_DOMAIN_UST: | |
1493 | { | |
1494 | struct ltt_ust_channel *uchan; | |
1495 | struct ltt_ust_session *usess; | |
1496 | ||
1497 | usess = session->ust_session; | |
1498 | ||
7076b56e JG |
1499 | if (validate_ust_event_name(event_name)) { |
1500 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1501 | goto error_unlock; | |
1502 | } | |
1503 | ||
85076754 MD |
1504 | /* |
1505 | * If a non-default channel has been created in the | |
9550ee81 | 1506 | * session, explicitly require that -c chan_name needs |
85076754 MD |
1507 | * to be provided. |
1508 | */ | |
1509 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1510 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1511 | goto error_unlock; |
85076754 MD |
1512 | } |
1513 | ||
2f77fc4b DG |
1514 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
1515 | channel_name); | |
1516 | if (uchan == NULL) { | |
f73fabfd | 1517 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
7076b56e | 1518 | goto error_unlock; |
2f77fc4b DG |
1519 | } |
1520 | ||
6e911cad MD |
1521 | switch (event->type) { |
1522 | case LTTNG_EVENT_ALL: | |
b3639870 JR |
1523 | /* |
1524 | * An empty event name means that everything | |
1525 | * should be disabled. | |
1526 | */ | |
1527 | if (event->name[0] == '\0') { | |
1528 | ret = event_ust_disable_all_tracepoints(usess, uchan); | |
77d536b2 JR |
1529 | } else { |
1530 | ret = event_ust_disable_tracepoint(usess, uchan, | |
1531 | event_name); | |
1532 | } | |
6e911cad | 1533 | if (ret != LTTNG_OK) { |
7076b56e | 1534 | goto error_unlock; |
6e911cad MD |
1535 | } |
1536 | break; | |
1537 | default: | |
1538 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1539 | goto error_unlock; |
2f77fc4b DG |
1540 | } |
1541 | ||
1542 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
1543 | channel_name); | |
1544 | break; | |
1545 | } | |
5cdb6027 | 1546 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1547 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1548 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1549 | { |
fefd409b | 1550 | struct agent *agt; |
f20baf8e DG |
1551 | struct ltt_ust_session *usess = session->ust_session; |
1552 | ||
1553 | assert(usess); | |
1554 | ||
6e911cad MD |
1555 | switch (event->type) { |
1556 | case LTTNG_EVENT_ALL: | |
1557 | break; | |
1558 | default: | |
1559 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1560 | goto error_unlock; |
6e911cad MD |
1561 | } |
1562 | ||
5cdb6027 | 1563 | agt = trace_ust_find_agent(usess, domain); |
fefd409b DG |
1564 | if (!agt) { |
1565 | ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
7076b56e | 1566 | goto error_unlock; |
fefd409b | 1567 | } |
b3639870 JR |
1568 | /* |
1569 | * An empty event name means that everything | |
1570 | * should be disabled. | |
1571 | */ | |
1572 | if (event->name[0] == '\0') { | |
18a720cd MD |
1573 | ret = event_agent_disable_all(usess, agt); |
1574 | } else { | |
1575 | ret = event_agent_disable(usess, agt, event_name); | |
1576 | } | |
f20baf8e | 1577 | if (ret != LTTNG_OK) { |
7076b56e | 1578 | goto error_unlock; |
f20baf8e DG |
1579 | } |
1580 | ||
1581 | break; | |
1582 | } | |
2f77fc4b | 1583 | default: |
f73fabfd | 1584 | ret = LTTNG_ERR_UND; |
7076b56e | 1585 | goto error_unlock; |
2f77fc4b DG |
1586 | } |
1587 | ||
f73fabfd | 1588 | ret = LTTNG_OK; |
2f77fc4b | 1589 | |
7076b56e | 1590 | error_unlock: |
2223c96f | 1591 | rcu_read_unlock(); |
7076b56e | 1592 | error: |
2f77fc4b DG |
1593 | return ret; |
1594 | } | |
1595 | ||
2f77fc4b DG |
1596 | /* |
1597 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1598 | */ | |
56a37563 | 1599 | int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain, |
601d5acf | 1600 | char *channel_name, struct lttng_event_context *ctx, int kwpipe) |
2f77fc4b | 1601 | { |
d5979e4a | 1602 | int ret, chan_kern_created = 0, chan_ust_created = 0; |
bdf64013 JG |
1603 | char *app_ctx_provider_name = NULL, *app_ctx_name = NULL; |
1604 | ||
1605 | if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
1606 | app_ctx_provider_name = ctx->u.app_ctx.provider_name; | |
1607 | app_ctx_name = ctx->u.app_ctx.ctx_name; | |
1608 | } | |
2f77fc4b DG |
1609 | |
1610 | switch (domain) { | |
1611 | case LTTNG_DOMAIN_KERNEL: | |
979e618e DG |
1612 | assert(session->kernel_session); |
1613 | ||
1614 | if (session->kernel_session->channel_count == 0) { | |
1615 | /* Create default channel */ | |
1616 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); | |
1617 | if (ret != LTTNG_OK) { | |
1618 | goto error; | |
1619 | } | |
d5979e4a | 1620 | chan_kern_created = 1; |
979e618e | 1621 | } |
2f77fc4b | 1622 | /* Add kernel context to kernel tracer */ |
601d5acf | 1623 | ret = context_kernel_add(session->kernel_session, ctx, channel_name); |
f73fabfd | 1624 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1625 | goto error; |
1626 | } | |
1627 | break; | |
bdf64013 JG |
1628 | case LTTNG_DOMAIN_JUL: |
1629 | case LTTNG_DOMAIN_LOG4J: | |
1630 | { | |
1631 | /* | |
1632 | * Validate channel name. | |
1633 | * If no channel name is given and the domain is JUL or LOG4J, | |
1634 | * set it to the appropriate domain-specific channel name. If | |
1635 | * a name is provided but does not match the expexted channel | |
1636 | * name, return an error. | |
1637 | */ | |
1638 | if (domain == LTTNG_DOMAIN_JUL && *channel_name && | |
1639 | strcmp(channel_name, | |
1640 | DEFAULT_JUL_CHANNEL_NAME)) { | |
1641 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1642 | goto error; | |
1643 | } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name && | |
1644 | strcmp(channel_name, | |
1645 | DEFAULT_LOG4J_CHANNEL_NAME)) { | |
1646 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1647 | goto error; | |
1648 | } | |
a93b3916 | 1649 | /* break is _not_ missing here. */ |
bdf64013 | 1650 | } |
2f77fc4b DG |
1651 | case LTTNG_DOMAIN_UST: |
1652 | { | |
1653 | struct ltt_ust_session *usess = session->ust_session; | |
85076754 MD |
1654 | unsigned int chan_count; |
1655 | ||
2f77fc4b DG |
1656 | assert(usess); |
1657 | ||
85076754 | 1658 | chan_count = lttng_ht_get_count(usess->domain_global.channels); |
979e618e DG |
1659 | if (chan_count == 0) { |
1660 | struct lttng_channel *attr; | |
1661 | /* Create default channel */ | |
0a9c6494 | 1662 | attr = channel_new_default_attr(domain, usess->buffer_type); |
979e618e DG |
1663 | if (attr == NULL) { |
1664 | ret = LTTNG_ERR_FATAL; | |
1665 | goto error; | |
1666 | } | |
1667 | ||
7972aab2 | 1668 | ret = channel_ust_create(usess, attr, usess->buffer_type); |
979e618e DG |
1669 | if (ret != LTTNG_OK) { |
1670 | free(attr); | |
1671 | goto error; | |
1672 | } | |
1673 | free(attr); | |
d5979e4a | 1674 | chan_ust_created = 1; |
979e618e DG |
1675 | } |
1676 | ||
601d5acf | 1677 | ret = context_ust_add(usess, domain, ctx, channel_name); |
bdf64013 JG |
1678 | free(app_ctx_provider_name); |
1679 | free(app_ctx_name); | |
1680 | app_ctx_name = NULL; | |
1681 | app_ctx_provider_name = NULL; | |
f73fabfd | 1682 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1683 | goto error; |
1684 | } | |
1685 | break; | |
1686 | } | |
2f77fc4b | 1687 | default: |
f73fabfd | 1688 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1689 | goto error; |
1690 | } | |
1691 | ||
bdf64013 JG |
1692 | ret = LTTNG_OK; |
1693 | goto end; | |
2f77fc4b DG |
1694 | |
1695 | error: | |
d5979e4a DG |
1696 | if (chan_kern_created) { |
1697 | struct ltt_kernel_channel *kchan = | |
1698 | trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME, | |
1699 | session->kernel_session); | |
1700 | /* Created previously, this should NOT fail. */ | |
1701 | assert(kchan); | |
1702 | kernel_destroy_channel(kchan); | |
1703 | } | |
1704 | ||
1705 | if (chan_ust_created) { | |
1706 | struct ltt_ust_channel *uchan = | |
1707 | trace_ust_find_channel_by_name( | |
1708 | session->ust_session->domain_global.channels, | |
1709 | DEFAULT_CHANNEL_NAME); | |
1710 | /* Created previously, this should NOT fail. */ | |
1711 | assert(uchan); | |
1712 | /* Remove from the channel list of the session. */ | |
1713 | trace_ust_delete_channel(session->ust_session->domain_global.channels, | |
1714 | uchan); | |
1715 | trace_ust_destroy_channel(uchan); | |
1716 | } | |
bdf64013 JG |
1717 | end: |
1718 | free(app_ctx_provider_name); | |
1719 | free(app_ctx_name); | |
2f77fc4b DG |
1720 | return ret; |
1721 | } | |
1722 | ||
930a2e99 JG |
1723 | static int validate_event_name(const char *name) |
1724 | { | |
1725 | int ret = 0; | |
1726 | const char *c = name; | |
1727 | const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN; | |
bf9807db | 1728 | bool null_terminated = false; |
930a2e99 JG |
1729 | |
1730 | /* | |
1731 | * Make sure that unescaped wildcards are only used as the last | |
1732 | * character of the event name. | |
1733 | */ | |
1734 | while (c < event_name_end) { | |
1735 | switch (*c) { | |
1736 | case '\0': | |
bf9807db | 1737 | null_terminated = true; |
930a2e99 JG |
1738 | goto end; |
1739 | case '\\': | |
1740 | c++; | |
1741 | break; | |
1742 | case '*': | |
1743 | if ((c + 1) < event_name_end && *(c + 1)) { | |
1744 | /* Wildcard is not the last character */ | |
1745 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1746 | goto end; | |
1747 | } | |
1748 | default: | |
1749 | break; | |
1750 | } | |
1751 | c++; | |
1752 | } | |
1753 | end: | |
bf9807db JG |
1754 | if (!ret && !null_terminated) { |
1755 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1756 | } | |
930a2e99 JG |
1757 | return ret; |
1758 | } | |
1759 | ||
dac8e046 JG |
1760 | static inline bool name_starts_with(const char *name, const char *prefix) |
1761 | { | |
1762 | const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN); | |
1763 | ||
1764 | return !strncmp(name, prefix, max_cmp_len); | |
1765 | } | |
1766 | ||
1767 | /* Perform userspace-specific event name validation */ | |
1768 | static int validate_ust_event_name(const char *name) | |
1769 | { | |
1770 | int ret = 0; | |
1771 | ||
1772 | if (!name) { | |
1773 | ret = -1; | |
1774 | goto end; | |
1775 | } | |
1776 | ||
1777 | /* | |
1778 | * Check name against all internal UST event component namespaces used | |
1779 | * by the agents. | |
1780 | */ | |
1781 | if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) || | |
1782 | name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) || | |
1783 | name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) { | |
1784 | ret = -1; | |
1785 | } | |
1786 | ||
1787 | end: | |
1788 | return ret; | |
1789 | } | |
88f06f15 | 1790 | |
2f77fc4b | 1791 | /* |
88f06f15 JG |
1792 | * Internal version of cmd_enable_event() with a supplemental |
1793 | * "internal_event" flag which is used to enable internal events which should | |
1794 | * be hidden from clients. Such events are used in the agent implementation to | |
1795 | * enable the events through which all "agent" events are funeled. | |
2f77fc4b | 1796 | */ |
88f06f15 JG |
1797 | static int _cmd_enable_event(struct ltt_session *session, |
1798 | struct lttng_domain *domain, | |
025faf73 | 1799 | char *channel_name, struct lttng_event *event, |
6b453b5e | 1800 | char *filter_expression, |
db8f1377 JI |
1801 | struct lttng_filter_bytecode *filter, |
1802 | struct lttng_event_exclusion *exclusion, | |
88f06f15 | 1803 | int wpipe, bool internal_event) |
2f77fc4b | 1804 | { |
e5f5db7f | 1805 | int ret, channel_created = 0; |
2f77fc4b DG |
1806 | struct lttng_channel *attr; |
1807 | ||
1808 | assert(session); | |
1809 | assert(event); | |
1810 | assert(channel_name); | |
1811 | ||
2a385866 JG |
1812 | /* If we have a filter, we must have its filter expression */ |
1813 | assert(!(!!filter_expression ^ !!filter)); | |
1814 | ||
18a720cd MD |
1815 | DBG("Enable event command for event \'%s\'", event->name); |
1816 | ||
f5ac4bd7 MD |
1817 | rcu_read_lock(); |
1818 | ||
930a2e99 JG |
1819 | ret = validate_event_name(event->name); |
1820 | if (ret) { | |
1821 | goto error; | |
1822 | } | |
1823 | ||
7972aab2 | 1824 | switch (domain->type) { |
2f77fc4b DG |
1825 | case LTTNG_DOMAIN_KERNEL: |
1826 | { | |
1827 | struct ltt_kernel_channel *kchan; | |
1828 | ||
85076754 MD |
1829 | /* |
1830 | * If a non-default channel has been created in the | |
1831 | * session, explicitely require that -c chan_name needs | |
1832 | * to be provided. | |
1833 | */ | |
1834 | if (session->kernel_session->has_non_default_channel | |
1835 | && channel_name[0] == '\0') { | |
1836 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1837 | goto error; | |
1838 | } | |
1839 | ||
2f77fc4b DG |
1840 | kchan = trace_kernel_get_channel_by_name(channel_name, |
1841 | session->kernel_session); | |
1842 | if (kchan == NULL) { | |
0a9c6494 DG |
1843 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
1844 | LTTNG_BUFFER_GLOBAL); | |
2f77fc4b | 1845 | if (attr == NULL) { |
f73fabfd | 1846 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1847 | goto error; |
1848 | } | |
1849 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1850 | ||
1851 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1852 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1853 | free(attr); |
1854 | goto error; | |
1855 | } | |
1856 | free(attr); | |
e5f5db7f DG |
1857 | |
1858 | channel_created = 1; | |
2f77fc4b DG |
1859 | } |
1860 | ||
1861 | /* Get the newly created kernel channel pointer */ | |
1862 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1863 | session->kernel_session); | |
1864 | if (kchan == NULL) { | |
1865 | /* This sould not happen... */ | |
f73fabfd | 1866 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1867 | goto error; |
1868 | } | |
1869 | ||
6e911cad MD |
1870 | switch (event->type) { |
1871 | case LTTNG_EVENT_ALL: | |
29c62722 | 1872 | { |
00a62084 MD |
1873 | char *filter_expression_a = NULL; |
1874 | struct lttng_filter_bytecode *filter_a = NULL; | |
1875 | ||
1876 | /* | |
1877 | * We need to duplicate filter_expression and filter, | |
1878 | * because ownership is passed to first enable | |
1879 | * event. | |
1880 | */ | |
1881 | if (filter_expression) { | |
1882 | filter_expression_a = strdup(filter_expression); | |
1883 | if (!filter_expression_a) { | |
1884 | ret = LTTNG_ERR_FATAL; | |
1885 | goto error; | |
1886 | } | |
1887 | } | |
1888 | if (filter) { | |
1889 | filter_a = zmalloc(sizeof(*filter_a) + filter->len); | |
1890 | if (!filter_a) { | |
1891 | free(filter_expression_a); | |
1892 | ret = LTTNG_ERR_FATAL; | |
1893 | goto error; | |
1894 | } | |
1895 | memcpy(filter_a, filter, sizeof(*filter_a) + filter->len); | |
1896 | } | |
29c62722 | 1897 | event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */ |
00a62084 MD |
1898 | ret = event_kernel_enable_event(kchan, event, |
1899 | filter_expression, filter); | |
a969e101 MD |
1900 | /* We have passed ownership */ |
1901 | filter_expression = NULL; | |
1902 | filter = NULL; | |
29c62722 MD |
1903 | if (ret != LTTNG_OK) { |
1904 | if (channel_created) { | |
1905 | /* Let's not leak a useless channel. */ | |
1906 | kernel_destroy_channel(kchan); | |
1907 | } | |
00a62084 MD |
1908 | free(filter_expression_a); |
1909 | free(filter_a); | |
29c62722 MD |
1910 | goto error; |
1911 | } | |
1912 | event->type = LTTNG_EVENT_SYSCALL; /* Hack */ | |
00a62084 MD |
1913 | ret = event_kernel_enable_event(kchan, event, |
1914 | filter_expression_a, filter_a); | |
60d21fa2 AB |
1915 | /* We have passed ownership */ |
1916 | filter_expression_a = NULL; | |
1917 | filter_a = NULL; | |
29c62722 MD |
1918 | if (ret != LTTNG_OK) { |
1919 | goto error; | |
1920 | } | |
1921 | break; | |
1922 | } | |
6e6ef3d7 DG |
1923 | case LTTNG_EVENT_PROBE: |
1924 | case LTTNG_EVENT_FUNCTION: | |
1925 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
6e911cad | 1926 | case LTTNG_EVENT_TRACEPOINT: |
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; | |
6e911cad MD |
1932 | if (ret != LTTNG_OK) { |
1933 | if (channel_created) { | |
1934 | /* Let's not leak a useless channel. */ | |
1935 | kernel_destroy_channel(kchan); | |
1936 | } | |
1937 | goto error; | |
e5f5db7f | 1938 | } |
6e911cad MD |
1939 | break; |
1940 | case LTTNG_EVENT_SYSCALL: | |
00a62084 MD |
1941 | ret = event_kernel_enable_event(kchan, event, |
1942 | filter_expression, filter); | |
a969e101 MD |
1943 | /* We have passed ownership */ |
1944 | filter_expression = NULL; | |
1945 | filter = NULL; | |
e2b957af MD |
1946 | if (ret != LTTNG_OK) { |
1947 | goto error; | |
1948 | } | |
6e911cad MD |
1949 | break; |
1950 | default: | |
1951 | ret = LTTNG_ERR_UNK; | |
2f77fc4b DG |
1952 | goto error; |
1953 | } | |
1954 | ||
1955 | kernel_wait_quiescent(kernel_tracer_fd); | |
1956 | break; | |
1957 | } | |
1958 | case LTTNG_DOMAIN_UST: | |
1959 | { | |
1960 | struct ltt_ust_channel *uchan; | |
1961 | struct ltt_ust_session *usess = session->ust_session; | |
1962 | ||
1963 | assert(usess); | |
1964 | ||
85076754 MD |
1965 | /* |
1966 | * If a non-default channel has been created in the | |
1967 | * session, explicitely require that -c chan_name needs | |
1968 | * to be provided. | |
1969 | */ | |
1970 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1971 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1972 | goto error; | |
1973 | } | |
1974 | ||
2f77fc4b DG |
1975 | /* Get channel from global UST domain */ |
1976 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
1977 | channel_name); | |
1978 | if (uchan == NULL) { | |
1979 | /* Create default channel */ | |
0a9c6494 DG |
1980 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
1981 | usess->buffer_type); | |
2f77fc4b | 1982 | if (attr == NULL) { |
f73fabfd | 1983 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1984 | goto error; |
1985 | } | |
1986 | strncpy(attr->name, channel_name, sizeof(attr->name)); | |
1987 | ||
1988 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1989 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1990 | free(attr); |
1991 | goto error; | |
1992 | } | |
1993 | free(attr); | |
1994 | ||
1995 | /* Get the newly created channel reference back */ | |
1996 | uchan = trace_ust_find_channel_by_name( | |
1997 | usess->domain_global.channels, channel_name); | |
1998 | assert(uchan); | |
1999 | } | |
2000 | ||
141feb8c JG |
2001 | if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) { |
2002 | /* | |
2003 | * Don't allow users to add UST events to channels which | |
2004 | * are assigned to a userspace subdomain (JUL, Log4J, | |
2005 | * Python, etc.). | |
2006 | */ | |
2007 | ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN; | |
2008 | goto error; | |
2009 | } | |
2010 | ||
dac8e046 JG |
2011 | if (!internal_event) { |
2012 | /* | |
2013 | * Ensure the event name is not reserved for internal | |
2014 | * use. | |
2015 | */ | |
2016 | ret = validate_ust_event_name(event->name); | |
2017 | if (ret) { | |
2018 | WARN("Userspace event name %s failed validation.", | |
2019 | event->name ? | |
2020 | event->name : "NULL"); | |
2021 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
2022 | goto error; | |
2023 | } | |
2024 | } | |
2025 | ||
2f77fc4b | 2026 | /* At this point, the session and channel exist on the tracer */ |
6b453b5e | 2027 | ret = event_ust_enable_tracepoint(usess, uchan, event, |
88f06f15 JG |
2028 | filter_expression, filter, exclusion, |
2029 | internal_event); | |
49d21f93 MD |
2030 | /* We have passed ownership */ |
2031 | filter_expression = NULL; | |
2032 | filter = NULL; | |
2033 | exclusion = NULL; | |
94382e15 JG |
2034 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2035 | goto already_enabled; | |
2036 | } else if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2037 | goto error; |
2038 | } | |
2039 | break; | |
2040 | } | |
5cdb6027 | 2041 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 2042 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2043 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 2044 | { |
da6c3a50 | 2045 | const char *default_event_name, *default_chan_name; |
fefd409b | 2046 | struct agent *agt; |
f20baf8e DG |
2047 | struct lttng_event uevent; |
2048 | struct lttng_domain tmp_dom; | |
2049 | struct ltt_ust_session *usess = session->ust_session; | |
2050 | ||
2051 | assert(usess); | |
2052 | ||
5cdb6027 | 2053 | agt = trace_ust_find_agent(usess, domain->type); |
fefd409b | 2054 | if (!agt) { |
5cdb6027 | 2055 | agt = agent_create(domain->type); |
fefd409b | 2056 | if (!agt) { |
e5b3c48c | 2057 | ret = LTTNG_ERR_NOMEM; |
fefd409b DG |
2058 | goto error; |
2059 | } | |
2060 | agent_add(agt, usess->agents); | |
2061 | } | |
2062 | ||
022d91ba | 2063 | /* Create the default tracepoint. */ |
996de3c7 | 2064 | memset(&uevent, 0, sizeof(uevent)); |
f20baf8e DG |
2065 | uevent.type = LTTNG_EVENT_TRACEPOINT; |
2066 | uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
51755dc8 JG |
2067 | default_event_name = event_get_default_agent_ust_name( |
2068 | domain->type); | |
da6c3a50 | 2069 | if (!default_event_name) { |
e5b3c48c | 2070 | ret = LTTNG_ERR_FATAL; |
da6c3a50 | 2071 | goto error; |
f43f95a9 | 2072 | } |
da6c3a50 | 2073 | strncpy(uevent.name, default_event_name, sizeof(uevent.name)); |
f20baf8e DG |
2074 | uevent.name[sizeof(uevent.name) - 1] = '\0'; |
2075 | ||
2076 | /* | |
2077 | * The domain type is changed because we are about to enable the | |
2078 | * default channel and event for the JUL domain that are hardcoded. | |
2079 | * This happens in the UST domain. | |
2080 | */ | |
2081 | memcpy(&tmp_dom, domain, sizeof(tmp_dom)); | |
2082 | tmp_dom.type = LTTNG_DOMAIN_UST; | |
2083 | ||
0e115563 DG |
2084 | switch (domain->type) { |
2085 | case LTTNG_DOMAIN_LOG4J: | |
da6c3a50 | 2086 | default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME; |
0e115563 DG |
2087 | break; |
2088 | case LTTNG_DOMAIN_JUL: | |
da6c3a50 | 2089 | default_chan_name = DEFAULT_JUL_CHANNEL_NAME; |
0e115563 DG |
2090 | break; |
2091 | case LTTNG_DOMAIN_PYTHON: | |
2092 | default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
2093 | break; | |
2094 | default: | |
e98a44b0 | 2095 | /* The switch/case we are in makes this impossible */ |
0e115563 | 2096 | assert(0); |
da6c3a50 DG |
2097 | } |
2098 | ||
971da06a | 2099 | { |
8404118c | 2100 | char *filter_expression_copy = NULL; |
51755dc8 | 2101 | struct lttng_filter_bytecode *filter_copy = NULL; |
971da06a JG |
2102 | |
2103 | if (filter) { | |
51755dc8 JG |
2104 | const size_t filter_size = sizeof( |
2105 | struct lttng_filter_bytecode) | |
2106 | + filter->len; | |
2107 | ||
2108 | filter_copy = zmalloc(filter_size); | |
971da06a | 2109 | if (!filter_copy) { |
018096a4 | 2110 | ret = LTTNG_ERR_NOMEM; |
b742e3e2 | 2111 | goto error; |
971da06a | 2112 | } |
51755dc8 | 2113 | memcpy(filter_copy, filter, filter_size); |
971da06a | 2114 | |
8404118c JG |
2115 | filter_expression_copy = |
2116 | strdup(filter_expression); | |
2117 | if (!filter_expression) { | |
2118 | ret = LTTNG_ERR_NOMEM; | |
51755dc8 JG |
2119 | } |
2120 | ||
2121 | if (!filter_expression_copy || !filter_copy) { | |
2122 | free(filter_expression_copy); | |
2123 | free(filter_copy); | |
2124 | goto error; | |
8404118c | 2125 | } |
971da06a JG |
2126 | } |
2127 | ||
88f06f15 | 2128 | ret = cmd_enable_event_internal(session, &tmp_dom, |
971da06a | 2129 | (char *) default_chan_name, |
8404118c JG |
2130 | &uevent, filter_expression_copy, |
2131 | filter_copy, NULL, wpipe); | |
971da06a JG |
2132 | } |
2133 | ||
94382e15 JG |
2134 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2135 | goto already_enabled; | |
2136 | } else if (ret != LTTNG_OK) { | |
f20baf8e DG |
2137 | goto error; |
2138 | } | |
2139 | ||
2140 | /* The wild card * means that everything should be enabled. */ | |
2141 | if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) { | |
8404118c JG |
2142 | ret = event_agent_enable_all(usess, agt, event, filter, |
2143 | filter_expression); | |
f20baf8e | 2144 | } else { |
8404118c JG |
2145 | ret = event_agent_enable(usess, agt, event, filter, |
2146 | filter_expression); | |
f20baf8e | 2147 | } |
51755dc8 JG |
2148 | filter = NULL; |
2149 | filter_expression = NULL; | |
f20baf8e DG |
2150 | if (ret != LTTNG_OK) { |
2151 | goto error; | |
2152 | } | |
2153 | ||
2154 | break; | |
2155 | } | |
2f77fc4b | 2156 | default: |
f73fabfd | 2157 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2158 | goto error; |
2159 | } | |
2160 | ||
f73fabfd | 2161 | ret = LTTNG_OK; |
2f77fc4b | 2162 | |
94382e15 | 2163 | already_enabled: |
2f77fc4b | 2164 | error: |
49d21f93 MD |
2165 | free(filter_expression); |
2166 | free(filter); | |
2167 | free(exclusion); | |
2223c96f | 2168 | rcu_read_unlock(); |
2f77fc4b DG |
2169 | return ret; |
2170 | } | |
2171 | ||
88f06f15 JG |
2172 | /* |
2173 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2174 | * We own filter, exclusion, and filter_expression. | |
2175 | */ | |
2176 | int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain, | |
2177 | char *channel_name, struct lttng_event *event, | |
2178 | char *filter_expression, | |
2179 | struct lttng_filter_bytecode *filter, | |
2180 | struct lttng_event_exclusion *exclusion, | |
2181 | int wpipe) | |
2182 | { | |
2183 | return _cmd_enable_event(session, domain, channel_name, event, | |
2184 | filter_expression, filter, exclusion, wpipe, false); | |
2185 | } | |
2186 | ||
2187 | /* | |
2188 | * Enable an event which is internal to LTTng. An internal should | |
2189 | * never be made visible to clients and are immune to checks such as | |
2190 | * reserved names. | |
2191 | */ | |
2192 | static int cmd_enable_event_internal(struct ltt_session *session, | |
2193 | struct lttng_domain *domain, | |
2194 | char *channel_name, struct lttng_event *event, | |
2195 | char *filter_expression, | |
2196 | struct lttng_filter_bytecode *filter, | |
2197 | struct lttng_event_exclusion *exclusion, | |
2198 | int wpipe) | |
2199 | { | |
2200 | return _cmd_enable_event(session, domain, channel_name, event, | |
2201 | filter_expression, filter, exclusion, wpipe, true); | |
2202 | } | |
2203 | ||
2f77fc4b DG |
2204 | /* |
2205 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2206 | */ | |
56a37563 JG |
2207 | ssize_t cmd_list_tracepoints(enum lttng_domain_type domain, |
2208 | struct lttng_event **events) | |
2f77fc4b DG |
2209 | { |
2210 | int ret; | |
2211 | ssize_t nb_events = 0; | |
2212 | ||
2213 | switch (domain) { | |
2214 | case LTTNG_DOMAIN_KERNEL: | |
2215 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2216 | if (nb_events < 0) { | |
f73fabfd | 2217 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
2f77fc4b DG |
2218 | goto error; |
2219 | } | |
2220 | break; | |
2221 | case LTTNG_DOMAIN_UST: | |
2222 | nb_events = ust_app_list_events(events); | |
2223 | if (nb_events < 0) { | |
f73fabfd | 2224 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2225 | goto error; |
2226 | } | |
2227 | break; | |
5cdb6027 | 2228 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2229 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2230 | case LTTNG_DOMAIN_PYTHON: |
f60140a1 | 2231 | nb_events = agent_list_events(events, domain); |
3c6a091f DG |
2232 | if (nb_events < 0) { |
2233 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2234 | goto error; | |
2235 | } | |
2236 | break; | |
2f77fc4b | 2237 | default: |
f73fabfd | 2238 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2239 | goto error; |
2240 | } | |
2241 | ||
2242 | return nb_events; | |
2243 | ||
2244 | error: | |
2245 | /* Return negative value to differentiate return code */ | |
2246 | return -ret; | |
2247 | } | |
2248 | ||
2249 | /* | |
2250 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
2251 | */ | |
56a37563 | 2252 | ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain, |
2f77fc4b DG |
2253 | struct lttng_event_field **fields) |
2254 | { | |
2255 | int ret; | |
2256 | ssize_t nb_fields = 0; | |
2257 | ||
2258 | switch (domain) { | |
2259 | case LTTNG_DOMAIN_UST: | |
2260 | nb_fields = ust_app_list_event_fields(fields); | |
2261 | if (nb_fields < 0) { | |
f73fabfd | 2262 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2263 | goto error; |
2264 | } | |
2265 | break; | |
2266 | case LTTNG_DOMAIN_KERNEL: | |
2267 | default: /* fall-through */ | |
f73fabfd | 2268 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2269 | goto error; |
2270 | } | |
2271 | ||
2272 | return nb_fields; | |
2273 | ||
2274 | error: | |
2275 | /* Return negative value to differentiate return code */ | |
2276 | return -ret; | |
2277 | } | |
2278 | ||
834978fd DG |
2279 | ssize_t cmd_list_syscalls(struct lttng_event **events) |
2280 | { | |
2281 | return syscall_table_list(events); | |
2282 | } | |
2283 | ||
a5dfbb9d MD |
2284 | /* |
2285 | * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread. | |
2286 | * | |
2287 | * Called with session lock held. | |
2288 | */ | |
2289 | ssize_t cmd_list_tracker_pids(struct ltt_session *session, | |
56a37563 | 2290 | enum lttng_domain_type domain, int32_t **pids) |
a5dfbb9d MD |
2291 | { |
2292 | int ret; | |
2293 | ssize_t nr_pids = 0; | |
2294 | ||
2295 | switch (domain) { | |
2296 | case LTTNG_DOMAIN_KERNEL: | |
2297 | { | |
2298 | struct ltt_kernel_session *ksess; | |
2299 | ||
2300 | ksess = session->kernel_session; | |
2301 | nr_pids = kernel_list_tracker_pids(ksess, pids); | |
2302 | if (nr_pids < 0) { | |
2303 | ret = LTTNG_ERR_KERN_LIST_FAIL; | |
2304 | goto error; | |
2305 | } | |
2306 | break; | |
2307 | } | |
2308 | case LTTNG_DOMAIN_UST: | |
2309 | { | |
2310 | struct ltt_ust_session *usess; | |
2311 | ||
2312 | usess = session->ust_session; | |
2313 | nr_pids = trace_ust_list_tracker_pids(usess, pids); | |
2314 | if (nr_pids < 0) { | |
2315 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2316 | goto error; | |
2317 | } | |
2318 | break; | |
2319 | } | |
2320 | case LTTNG_DOMAIN_LOG4J: | |
2321 | case LTTNG_DOMAIN_JUL: | |
2322 | case LTTNG_DOMAIN_PYTHON: | |
2323 | default: | |
2324 | ret = LTTNG_ERR_UND; | |
2325 | goto error; | |
2326 | } | |
2327 | ||
2328 | return nr_pids; | |
2329 | ||
2330 | error: | |
2331 | /* Return negative value to differentiate return code */ | |
2332 | return -ret; | |
2333 | } | |
2334 | ||
2f77fc4b DG |
2335 | /* |
2336 | * Command LTTNG_START_TRACE processed by the client thread. | |
a9ad0c8f MD |
2337 | * |
2338 | * Called with session mutex held. | |
2f77fc4b DG |
2339 | */ |
2340 | int cmd_start_trace(struct ltt_session *session) | |
2341 | { | |
2342 | int ret; | |
cde3e505 | 2343 | unsigned long nb_chan = 0; |
2f77fc4b DG |
2344 | struct ltt_kernel_session *ksession; |
2345 | struct ltt_ust_session *usess; | |
2f77fc4b DG |
2346 | |
2347 | assert(session); | |
2348 | ||
2349 | /* Ease our life a bit ;) */ | |
2350 | ksession = session->kernel_session; | |
2351 | usess = session->ust_session; | |
2352 | ||
8382cf6f DG |
2353 | /* Is the session already started? */ |
2354 | if (session->active) { | |
f73fabfd | 2355 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2356 | goto error; |
2357 | } | |
2358 | ||
cde3e505 DG |
2359 | /* |
2360 | * Starting a session without channel is useless since after that it's not | |
2361 | * possible to enable channel thus inform the client. | |
2362 | */ | |
2363 | if (usess && usess->domain_global.channels) { | |
2364 | nb_chan += lttng_ht_get_count(usess->domain_global.channels); | |
2365 | } | |
2366 | if (ksession) { | |
2367 | nb_chan += ksession->channel_count; | |
2368 | } | |
2369 | if (!nb_chan) { | |
2370 | ret = LTTNG_ERR_NO_CHANNEL; | |
2371 | goto error; | |
2372 | } | |
2373 | ||
2f77fc4b DG |
2374 | /* Kernel tracing */ |
2375 | if (ksession != NULL) { | |
9b6c7ec5 DG |
2376 | ret = start_kernel_session(ksession, kernel_tracer_fd); |
2377 | if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2378 | goto error; |
2379 | } | |
2f77fc4b DG |
2380 | } |
2381 | ||
2382 | /* Flag session that trace should start automatically */ | |
2383 | if (usess) { | |
14fb1ebe DG |
2384 | /* |
2385 | * Even though the start trace might fail, flag this session active so | |
2386 | * other application coming in are started by default. | |
2387 | */ | |
2388 | usess->active = 1; | |
2f77fc4b DG |
2389 | |
2390 | ret = ust_app_start_trace_all(usess); | |
2391 | if (ret < 0) { | |
f73fabfd | 2392 | ret = LTTNG_ERR_UST_START_FAIL; |
2f77fc4b DG |
2393 | goto error; |
2394 | } | |
2395 | } | |
2396 | ||
8382cf6f DG |
2397 | /* Flag this after a successful start. */ |
2398 | session->has_been_started = 1; | |
2399 | session->active = 1; | |
9b6c7ec5 | 2400 | |
f73fabfd | 2401 | ret = LTTNG_OK; |
2f77fc4b DG |
2402 | |
2403 | error: | |
2404 | return ret; | |
2405 | } | |
2406 | ||
2407 | /* | |
2408 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2409 | */ | |
2410 | int cmd_stop_trace(struct ltt_session *session) | |
2411 | { | |
2412 | int ret; | |
2413 | struct ltt_kernel_channel *kchan; | |
2414 | struct ltt_kernel_session *ksession; | |
2415 | struct ltt_ust_session *usess; | |
2416 | ||
2417 | assert(session); | |
2418 | ||
2419 | /* Short cut */ | |
2420 | ksession = session->kernel_session; | |
2421 | usess = session->ust_session; | |
2422 | ||
8382cf6f DG |
2423 | /* Session is not active. Skip everythong and inform the client. */ |
2424 | if (!session->active) { | |
f73fabfd | 2425 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
2f77fc4b DG |
2426 | goto error; |
2427 | } | |
2428 | ||
2f77fc4b | 2429 | /* Kernel tracer */ |
14fb1ebe | 2430 | if (ksession && ksession->active) { |
2f77fc4b DG |
2431 | DBG("Stop kernel tracing"); |
2432 | ||
2433 | /* Flush metadata if exist */ | |
2434 | if (ksession->metadata_stream_fd >= 0) { | |
2435 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2436 | if (ret < 0) { | |
2437 | ERR("Kernel metadata flush failed"); | |
2438 | } | |
2439 | } | |
2440 | ||
2441 | /* Flush all buffers before stopping */ | |
2442 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2443 | ret = kernel_flush_buffer(kchan); | |
2444 | if (ret < 0) { | |
2445 | ERR("Kernel flush buffer error"); | |
2446 | } | |
2447 | } | |
2448 | ||
2449 | ret = kernel_stop_session(ksession); | |
2450 | if (ret < 0) { | |
f73fabfd | 2451 | ret = LTTNG_ERR_KERN_STOP_FAIL; |
2f77fc4b DG |
2452 | goto error; |
2453 | } | |
2454 | ||
2455 | kernel_wait_quiescent(kernel_tracer_fd); | |
9b6c7ec5 | 2456 | |
14fb1ebe | 2457 | ksession->active = 0; |
2f77fc4b DG |
2458 | } |
2459 | ||
14fb1ebe DG |
2460 | if (usess && usess->active) { |
2461 | /* | |
2462 | * Even though the stop trace might fail, flag this session inactive so | |
2463 | * other application coming in are not started by default. | |
2464 | */ | |
2465 | usess->active = 0; | |
2f77fc4b DG |
2466 | |
2467 | ret = ust_app_stop_trace_all(usess); | |
2468 | if (ret < 0) { | |
f73fabfd | 2469 | ret = LTTNG_ERR_UST_STOP_FAIL; |
2f77fc4b DG |
2470 | goto error; |
2471 | } | |
2472 | } | |
2473 | ||
8382cf6f DG |
2474 | /* Flag inactive after a successful stop. */ |
2475 | session->active = 0; | |
f73fabfd | 2476 | ret = LTTNG_OK; |
2f77fc4b DG |
2477 | |
2478 | error: | |
2479 | return ret; | |
2480 | } | |
2481 | ||
2482 | /* | |
2483 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
2484 | */ | |
bda32d56 JG |
2485 | int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri, |
2486 | struct lttng_uri *uris) | |
2f77fc4b DG |
2487 | { |
2488 | int ret, i; | |
2489 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2490 | struct ltt_ust_session *usess = session->ust_session; | |
2f77fc4b DG |
2491 | |
2492 | assert(session); | |
2493 | assert(uris); | |
2494 | assert(nb_uri > 0); | |
2495 | ||
8382cf6f DG |
2496 | /* Can't set consumer URI if the session is active. */ |
2497 | if (session->active) { | |
f73fabfd | 2498 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2499 | goto error; |
2500 | } | |
2501 | ||
bda32d56 | 2502 | /* Set the "global" consumer URIs */ |
2f77fc4b | 2503 | for (i = 0; i < nb_uri; i++) { |
bda32d56 JG |
2504 | ret = add_uri_to_consumer(session->consumer, |
2505 | &uris[i], 0, session->name); | |
a74934ba | 2506 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2507 | goto error; |
2508 | } | |
2f77fc4b DG |
2509 | } |
2510 | ||
bda32d56 JG |
2511 | /* Set UST session URIs */ |
2512 | if (session->ust_session) { | |
2513 | for (i = 0; i < nb_uri; i++) { | |
2514 | ret = add_uri_to_consumer( | |
2515 | session->ust_session->consumer, | |
2516 | &uris[i], LTTNG_DOMAIN_UST, | |
2517 | session->name); | |
2518 | if (ret != LTTNG_OK) { | |
2519 | goto error; | |
2520 | } | |
2521 | } | |
2522 | } | |
2523 | ||
2524 | /* Set kernel session URIs */ | |
2525 | if (session->kernel_session) { | |
2526 | for (i = 0; i < nb_uri; i++) { | |
2527 | ret = add_uri_to_consumer( | |
2528 | session->kernel_session->consumer, | |
2529 | &uris[i], LTTNG_DOMAIN_KERNEL, | |
2530 | session->name); | |
2531 | if (ret != LTTNG_OK) { | |
2532 | goto error; | |
2533 | } | |
2534 | } | |
2535 | } | |
2536 | ||
7ab70fe0 DG |
2537 | /* |
2538 | * Make sure to set the session in output mode after we set URI since a | |
2539 | * session can be created without URL (thus flagged in no output mode). | |
2540 | */ | |
2541 | session->output_traces = 1; | |
2542 | if (ksess) { | |
2543 | ksess->output_traces = 1; | |
bda32d56 JG |
2544 | } |
2545 | ||
2546 | if (usess) { | |
7ab70fe0 DG |
2547 | usess->output_traces = 1; |
2548 | } | |
2549 | ||
2f77fc4b | 2550 | /* All good! */ |
f73fabfd | 2551 | ret = LTTNG_OK; |
2f77fc4b DG |
2552 | |
2553 | error: | |
2554 | return ret; | |
2555 | } | |
2556 | ||
2557 | /* | |
2558 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2559 | */ | |
2560 | int cmd_create_session_uri(char *name, struct lttng_uri *uris, | |
ecc48a90 | 2561 | size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer) |
2f77fc4b DG |
2562 | { |
2563 | int ret; | |
2f77fc4b DG |
2564 | struct ltt_session *session; |
2565 | ||
2566 | assert(name); | |
2bba9e53 | 2567 | assert(creds); |
785d2d0d | 2568 | |
2f77fc4b DG |
2569 | /* |
2570 | * Verify if the session already exist | |
2571 | * | |
2572 | * XXX: There is no need for the session lock list here since the caller | |
2573 | * (process_client_msg) is holding it. We might want to change that so a | |
2574 | * single command does not lock the entire session list. | |
2575 | */ | |
2576 | session = session_find_by_name(name); | |
2577 | if (session != NULL) { | |
f73fabfd | 2578 | ret = LTTNG_ERR_EXIST_SESS; |
2f77fc4b DG |
2579 | goto find_error; |
2580 | } | |
2581 | ||
2582 | /* Create tracing session in the registry */ | |
dec56f6c | 2583 | ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds), |
2f77fc4b | 2584 | LTTNG_SOCK_GET_GID_CRED(creds)); |
f73fabfd | 2585 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2586 | goto session_error; |
2587 | } | |
2588 | ||
2589 | /* | |
2590 | * Get the newly created session pointer back | |
2591 | * | |
2592 | * XXX: There is no need for the session lock list here since the caller | |
2593 | * (process_client_msg) is holding it. We might want to change that so a | |
2594 | * single command does not lock the entire session list. | |
2595 | */ | |
2596 | session = session_find_by_name(name); | |
2597 | assert(session); | |
2598 | ||
ecc48a90 | 2599 | session->live_timer = live_timer; |
2f77fc4b DG |
2600 | /* Create default consumer output for the session not yet created. */ |
2601 | session->consumer = consumer_create_output(CONSUMER_DST_LOCAL); | |
2602 | if (session->consumer == NULL) { | |
f73fabfd | 2603 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2604 | goto consumer_error; |
2605 | } | |
2606 | ||
2bba9e53 | 2607 | if (uris) { |
bda32d56 | 2608 | ret = cmd_set_consumer_uri(session, nb_uri, uris); |
2bba9e53 DG |
2609 | if (ret != LTTNG_OK) { |
2610 | goto consumer_error; | |
2611 | } | |
2612 | session->output_traces = 1; | |
2613 | } else { | |
2614 | session->output_traces = 0; | |
2615 | DBG2("Session %s created with no output", session->name); | |
2f77fc4b DG |
2616 | } |
2617 | ||
2618 | session->consumer->enabled = 1; | |
2619 | ||
f73fabfd | 2620 | return LTTNG_OK; |
2f77fc4b DG |
2621 | |
2622 | consumer_error: | |
2623 | session_destroy(session); | |
2624 | session_error: | |
2625 | find_error: | |
2626 | return ret; | |
2627 | } | |
2628 | ||
27babd3a DG |
2629 | /* |
2630 | * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread. | |
2631 | */ | |
2632 | int cmd_create_session_snapshot(char *name, struct lttng_uri *uris, | |
2633 | size_t nb_uri, lttng_sock_cred *creds) | |
2634 | { | |
2635 | int ret; | |
2636 | struct ltt_session *session; | |
2637 | struct snapshot_output *new_output = NULL; | |
2638 | ||
2639 | assert(name); | |
2640 | assert(creds); | |
2641 | ||
2642 | /* | |
2643 | * Create session in no output mode with URIs set to NULL. The uris we've | |
2644 | * received are for a default snapshot output if one. | |
2645 | */ | |
ae58b817 | 2646 | ret = cmd_create_session_uri(name, NULL, 0, creds, 0); |
27babd3a DG |
2647 | if (ret != LTTNG_OK) { |
2648 | goto error; | |
2649 | } | |
2650 | ||
2651 | /* Get the newly created session pointer back. This should NEVER fail. */ | |
2652 | session = session_find_by_name(name); | |
2653 | assert(session); | |
2654 | ||
2655 | /* Flag session for snapshot mode. */ | |
2656 | session->snapshot_mode = 1; | |
2657 | ||
2658 | /* Skip snapshot output creation if no URI is given. */ | |
2659 | if (nb_uri == 0) { | |
2660 | goto end; | |
2661 | } | |
2662 | ||
2663 | new_output = snapshot_output_alloc(); | |
2664 | if (!new_output) { | |
2665 | ret = LTTNG_ERR_NOMEM; | |
2666 | goto error_snapshot_alloc; | |
2667 | } | |
2668 | ||
2669 | ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL, | |
2670 | uris, nb_uri, session->consumer, new_output, &session->snapshot); | |
2671 | if (ret < 0) { | |
2672 | if (ret == -ENOMEM) { | |
2673 | ret = LTTNG_ERR_NOMEM; | |
2674 | } else { | |
2675 | ret = LTTNG_ERR_INVALID; | |
2676 | } | |
2677 | goto error_snapshot; | |
2678 | } | |
2679 | ||
2680 | rcu_read_lock(); | |
2681 | snapshot_add_output(&session->snapshot, new_output); | |
2682 | rcu_read_unlock(); | |
2683 | ||
2684 | end: | |
2685 | return LTTNG_OK; | |
2686 | ||
2687 | error_snapshot: | |
2688 | snapshot_output_destroy(new_output); | |
2689 | error_snapshot_alloc: | |
2690 | session_destroy(session); | |
2691 | error: | |
2692 | return ret; | |
2693 | } | |
2694 | ||
2f77fc4b DG |
2695 | /* |
2696 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
a9ad0c8f MD |
2697 | * |
2698 | * Called with session lock held. | |
2f77fc4b DG |
2699 | */ |
2700 | int cmd_destroy_session(struct ltt_session *session, int wpipe) | |
2701 | { | |
2702 | int ret; | |
2703 | struct ltt_ust_session *usess; | |
2704 | struct ltt_kernel_session *ksess; | |
2705 | ||
2706 | /* Safety net */ | |
2707 | assert(session); | |
2708 | ||
2709 | usess = session->ust_session; | |
2710 | ksess = session->kernel_session; | |
2711 | ||
2712 | /* Clean kernel session teardown */ | |
2713 | kernel_destroy_session(ksess); | |
2714 | ||
2715 | /* UST session teardown */ | |
2716 | if (usess) { | |
2717 | /* Close any relayd session */ | |
2718 | consumer_output_send_destroy_relayd(usess->consumer); | |
2719 | ||
2720 | /* Destroy every UST application related to this session. */ | |
2721 | ret = ust_app_destroy_trace_all(usess); | |
2722 | if (ret) { | |
2723 | ERR("Error in ust_app_destroy_trace_all"); | |
2724 | } | |
2725 | ||
2726 | /* Clean up the rest. */ | |
2727 | trace_ust_destroy_session(usess); | |
2728 | } | |
2729 | ||
2730 | /* | |
2731 | * Must notify the kernel thread here to update it's poll set in order to | |
2732 | * remove the channel(s)' fd just destroyed. | |
2733 | */ | |
2734 | ret = notify_thread_pipe(wpipe); | |
2735 | if (ret < 0) { | |
2736 | PERROR("write kernel poll pipe"); | |
2737 | } | |
2738 | ||
2739 | ret = session_destroy(session); | |
2740 | ||
2741 | return ret; | |
2742 | } | |
2743 | ||
2744 | /* | |
2745 | * Command LTTNG_CALIBRATE processed by the client thread. | |
2746 | */ | |
56a37563 JG |
2747 | int cmd_calibrate(enum lttng_domain_type domain, |
2748 | struct lttng_calibrate *calibrate) | |
2f77fc4b DG |
2749 | { |
2750 | int ret; | |
2751 | ||
2752 | switch (domain) { | |
2753 | case LTTNG_DOMAIN_KERNEL: | |
2754 | { | |
2755 | struct lttng_kernel_calibrate kcalibrate; | |
2756 | ||
2e84128e DG |
2757 | switch (calibrate->type) { |
2758 | case LTTNG_CALIBRATE_FUNCTION: | |
2759 | default: | |
2760 | /* Default and only possible calibrate option. */ | |
2761 | kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE; | |
2762 | break; | |
2763 | } | |
2764 | ||
2f77fc4b DG |
2765 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); |
2766 | if (ret < 0) { | |
f73fabfd | 2767 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
2f77fc4b DG |
2768 | goto error; |
2769 | } | |
2770 | break; | |
2771 | } | |
2772 | case LTTNG_DOMAIN_UST: | |
2773 | { | |
2774 | struct lttng_ust_calibrate ucalibrate; | |
2775 | ||
2e84128e DG |
2776 | switch (calibrate->type) { |
2777 | case LTTNG_CALIBRATE_FUNCTION: | |
2778 | default: | |
2779 | /* Default and only possible calibrate option. */ | |
2780 | ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT; | |
2781 | break; | |
2782 | } | |
2783 | ||
2f77fc4b DG |
2784 | ret = ust_app_calibrate_glb(&ucalibrate); |
2785 | if (ret < 0) { | |
f73fabfd | 2786 | ret = LTTNG_ERR_UST_CALIBRATE_FAIL; |
2f77fc4b DG |
2787 | goto error; |
2788 | } | |
2789 | break; | |
2790 | } | |
2791 | default: | |
f73fabfd | 2792 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2793 | goto error; |
2794 | } | |
2795 | ||
f73fabfd | 2796 | ret = LTTNG_OK; |
2f77fc4b DG |
2797 | |
2798 | error: | |
2799 | return ret; | |
2800 | } | |
2801 | ||
2802 | /* | |
2803 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
2804 | */ | |
56a37563 JG |
2805 | int cmd_register_consumer(struct ltt_session *session, |
2806 | enum lttng_domain_type domain, const char *sock_path, | |
2807 | struct consumer_data *cdata) | |
2f77fc4b DG |
2808 | { |
2809 | int ret, sock; | |
dd81b457 | 2810 | struct consumer_socket *socket = NULL; |
2f77fc4b DG |
2811 | |
2812 | assert(session); | |
2813 | assert(cdata); | |
2814 | assert(sock_path); | |
2815 | ||
2816 | switch (domain) { | |
2817 | case LTTNG_DOMAIN_KERNEL: | |
2818 | { | |
2819 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2820 | ||
2821 | assert(ksess); | |
2822 | ||
2823 | /* Can't register a consumer if there is already one */ | |
2824 | if (ksess->consumer_fds_sent != 0) { | |
f73fabfd | 2825 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
2826 | goto error; |
2827 | } | |
2828 | ||
2829 | sock = lttcomm_connect_unix_sock(sock_path); | |
2830 | if (sock < 0) { | |
f73fabfd | 2831 | ret = LTTNG_ERR_CONNECT_FAIL; |
2f77fc4b DG |
2832 | goto error; |
2833 | } | |
4ce514c4 | 2834 | cdata->cmd_sock = sock; |
2f77fc4b | 2835 | |
4ce514c4 | 2836 | socket = consumer_allocate_socket(&cdata->cmd_sock); |
2f77fc4b | 2837 | if (socket == NULL) { |
f66c074c DG |
2838 | ret = close(sock); |
2839 | if (ret < 0) { | |
2840 | PERROR("close register consumer"); | |
2841 | } | |
4ce514c4 | 2842 | cdata->cmd_sock = -1; |
f73fabfd | 2843 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2844 | goto error; |
2845 | } | |
2846 | ||
2847 | socket->lock = zmalloc(sizeof(pthread_mutex_t)); | |
2848 | if (socket->lock == NULL) { | |
2849 | PERROR("zmalloc pthread mutex"); | |
f73fabfd | 2850 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2851 | goto error; |
2852 | } | |
2853 | pthread_mutex_init(socket->lock, NULL); | |
2854 | socket->registered = 1; | |
2855 | ||
2856 | rcu_read_lock(); | |
2857 | consumer_add_socket(socket, ksess->consumer); | |
2858 | rcu_read_unlock(); | |
2859 | ||
2860 | pthread_mutex_lock(&cdata->pid_mutex); | |
2861 | cdata->pid = -1; | |
2862 | pthread_mutex_unlock(&cdata->pid_mutex); | |
2863 | ||
2864 | break; | |
2865 | } | |
2866 | default: | |
2867 | /* TODO: Userspace tracing */ | |
f73fabfd | 2868 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2869 | goto error; |
2870 | } | |
2871 | ||
dd81b457 | 2872 | return LTTNG_OK; |
2f77fc4b DG |
2873 | |
2874 | error: | |
dd81b457 DG |
2875 | if (socket) { |
2876 | consumer_destroy_socket(socket); | |
2877 | } | |
2f77fc4b DG |
2878 | return ret; |
2879 | } | |
2880 | ||
2881 | /* | |
2882 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
2883 | */ | |
2884 | ssize_t cmd_list_domains(struct ltt_session *session, | |
2885 | struct lttng_domain **domains) | |
2886 | { | |
2887 | int ret, index = 0; | |
2888 | ssize_t nb_dom = 0; | |
fefd409b DG |
2889 | struct agent *agt; |
2890 | struct lttng_ht_iter iter; | |
2f77fc4b DG |
2891 | |
2892 | if (session->kernel_session != NULL) { | |
2893 | DBG3("Listing domains found kernel domain"); | |
2894 | nb_dom++; | |
2895 | } | |
2896 | ||
2897 | if (session->ust_session != NULL) { | |
2898 | DBG3("Listing domains found UST global domain"); | |
2899 | nb_dom++; | |
3c6a091f | 2900 | |
e0a74f01 | 2901 | rcu_read_lock(); |
fefd409b DG |
2902 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2903 | agt, node.node) { | |
2904 | if (agt->being_used) { | |
2905 | nb_dom++; | |
2906 | } | |
3c6a091f | 2907 | } |
e0a74f01 | 2908 | rcu_read_unlock(); |
2f77fc4b DG |
2909 | } |
2910 | ||
fa64dfb4 JG |
2911 | if (!nb_dom) { |
2912 | goto end; | |
2913 | } | |
2914 | ||
2f77fc4b DG |
2915 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
2916 | if (*domains == NULL) { | |
f73fabfd | 2917 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2918 | goto error; |
2919 | } | |
2920 | ||
2921 | if (session->kernel_session != NULL) { | |
2922 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
b5edb9e8 PP |
2923 | |
2924 | /* Kernel session buffer type is always GLOBAL */ | |
2925 | (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL; | |
2926 | ||
2f77fc4b DG |
2927 | index++; |
2928 | } | |
2929 | ||
2930 | if (session->ust_session != NULL) { | |
2931 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
88c5f0d8 | 2932 | (*domains)[index].buf_type = session->ust_session->buffer_type; |
2f77fc4b | 2933 | index++; |
3c6a091f | 2934 | |
e0a74f01 | 2935 | rcu_read_lock(); |
fefd409b DG |
2936 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2937 | agt, node.node) { | |
2938 | if (agt->being_used) { | |
2939 | (*domains)[index].type = agt->domain; | |
2940 | (*domains)[index].buf_type = session->ust_session->buffer_type; | |
2941 | index++; | |
2942 | } | |
3c6a091f | 2943 | } |
e0a74f01 | 2944 | rcu_read_unlock(); |
2f77fc4b | 2945 | } |
fa64dfb4 | 2946 | end: |
2f77fc4b DG |
2947 | return nb_dom; |
2948 | ||
2949 | error: | |
f73fabfd DG |
2950 | /* Return negative value to differentiate return code */ |
2951 | return -ret; | |
2f77fc4b DG |
2952 | } |
2953 | ||
2954 | ||
2955 | /* | |
2956 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
2957 | */ | |
56a37563 JG |
2958 | ssize_t cmd_list_channels(enum lttng_domain_type domain, |
2959 | struct ltt_session *session, struct lttng_channel **channels) | |
2f77fc4b | 2960 | { |
53e367f9 | 2961 | ssize_t nb_chan = 0, payload_size = 0, ret; |
2f77fc4b DG |
2962 | |
2963 | switch (domain) { | |
2964 | case LTTNG_DOMAIN_KERNEL: | |
2965 | if (session->kernel_session != NULL) { | |
2966 | nb_chan = session->kernel_session->channel_count; | |
2967 | } | |
2968 | DBG3("Number of kernel channels %zd", nb_chan); | |
c7d620a2 | 2969 | if (nb_chan <= 0) { |
53e367f9 JG |
2970 | ret = -LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2971 | goto end; | |
c7d620a2 | 2972 | } |
2f77fc4b DG |
2973 | break; |
2974 | case LTTNG_DOMAIN_UST: | |
2975 | if (session->ust_session != NULL) { | |
7ffc31a2 | 2976 | rcu_read_lock(); |
2f77fc4b | 2977 | nb_chan = lttng_ht_get_count( |
7ffc31a2 JG |
2978 | session->ust_session->domain_global.channels); |
2979 | rcu_read_unlock(); | |
2f77fc4b DG |
2980 | } |
2981 | DBG3("Number of UST global channels %zd", nb_chan); | |
ade7ce52 | 2982 | if (nb_chan < 0) { |
53e367f9 JG |
2983 | ret = -LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2984 | goto end; | |
c7d620a2 | 2985 | } |
2f77fc4b DG |
2986 | break; |
2987 | default: | |
53e367f9 JG |
2988 | ret = -LTTNG_ERR_UND; |
2989 | goto end; | |
2f77fc4b DG |
2990 | } |
2991 | ||
2992 | if (nb_chan > 0) { | |
53e367f9 JG |
2993 | const size_t channel_size = sizeof(struct lttng_channel) + |
2994 | sizeof(struct lttcomm_channel_extended); | |
2995 | struct lttcomm_channel_extended *channel_exts; | |
2996 | ||
2997 | payload_size = nb_chan * channel_size; | |
2998 | *channels = zmalloc(payload_size); | |
2f77fc4b | 2999 | if (*channels == NULL) { |
53e367f9 JG |
3000 | ret = -LTTNG_ERR_FATAL; |
3001 | goto end; | |
2f77fc4b DG |
3002 | } |
3003 | ||
53e367f9 JG |
3004 | channel_exts = ((void *) *channels) + |
3005 | (nb_chan * sizeof(struct lttng_channel)); | |
3006 | list_lttng_channels(domain, session, *channels, channel_exts); | |
3007 | } else { | |
3008 | *channels = NULL; | |
2f77fc4b DG |
3009 | } |
3010 | ||
53e367f9 JG |
3011 | ret = payload_size; |
3012 | end: | |
3013 | return ret; | |
2f77fc4b DG |
3014 | } |
3015 | ||
3016 | /* | |
3017 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3018 | */ | |
56a37563 JG |
3019 | ssize_t cmd_list_events(enum lttng_domain_type domain, |
3020 | struct ltt_session *session, char *channel_name, | |
b4e3ceb9 | 3021 | struct lttng_event **events, size_t *total_size) |
2f77fc4b DG |
3022 | { |
3023 | int ret = 0; | |
3024 | ssize_t nb_event = 0; | |
3025 | ||
3026 | switch (domain) { | |
3027 | case LTTNG_DOMAIN_KERNEL: | |
3028 | if (session->kernel_session != NULL) { | |
3029 | nb_event = list_lttng_kernel_events(channel_name, | |
b4e3ceb9 PP |
3030 | session->kernel_session, events, |
3031 | total_size); | |
2f77fc4b DG |
3032 | } |
3033 | break; | |
3034 | case LTTNG_DOMAIN_UST: | |
3035 | { | |
3036 | if (session->ust_session != NULL) { | |
3037 | nb_event = list_lttng_ust_global_events(channel_name, | |
b4e3ceb9 PP |
3038 | &session->ust_session->domain_global, events, |
3039 | total_size); | |
2f77fc4b DG |
3040 | } |
3041 | break; | |
3042 | } | |
5cdb6027 | 3043 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 3044 | case LTTNG_DOMAIN_JUL: |
0e115563 | 3045 | case LTTNG_DOMAIN_PYTHON: |
3c6a091f | 3046 | if (session->ust_session) { |
fefd409b DG |
3047 | struct lttng_ht_iter iter; |
3048 | struct agent *agt; | |
3049 | ||
b11feea5 | 3050 | rcu_read_lock(); |
fefd409b DG |
3051 | cds_lfht_for_each_entry(session->ust_session->agents->ht, |
3052 | &iter.iter, agt, node.node) { | |
1dfd9906 JG |
3053 | if (agt->domain == domain) { |
3054 | nb_event = list_lttng_agent_events( | |
b4e3ceb9 PP |
3055 | agt, events, |
3056 | total_size); | |
1dfd9906 JG |
3057 | break; |
3058 | } | |
fefd409b | 3059 | } |
b11feea5 | 3060 | rcu_read_unlock(); |
3c6a091f DG |
3061 | } |
3062 | break; | |
2f77fc4b | 3063 | default: |
f73fabfd | 3064 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3065 | goto error; |
3066 | } | |
3067 | ||
f73fabfd | 3068 | return nb_event; |
2f77fc4b DG |
3069 | |
3070 | error: | |
f73fabfd DG |
3071 | /* Return negative value to differentiate return code */ |
3072 | return -ret; | |
2f77fc4b DG |
3073 | } |
3074 | ||
3075 | /* | |
3076 | * Using the session list, filled a lttng_session array to send back to the | |
3077 | * client for session listing. | |
3078 | * | |
3079 | * The session list lock MUST be acquired before calling this function. Use | |
3080 | * session_lock_list() and session_unlock_list(). | |
3081 | */ | |
3082 | void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid, | |
3083 | gid_t gid) | |
3084 | { | |
3085 | int ret; | |
3086 | unsigned int i = 0; | |
3087 | struct ltt_session *session; | |
3088 | struct ltt_session_list *list = session_get_list(); | |
3089 | ||
3090 | DBG("Getting all available session for UID %d GID %d", | |
3091 | uid, gid); | |
3092 | /* | |
3093 | * Iterate over session list and append data after the control struct in | |
3094 | * the buffer. | |
3095 | */ | |
3096 | cds_list_for_each_entry(session, &list->head, list) { | |
3097 | /* | |
3098 | * Only list the sessions the user can control. | |
3099 | */ | |
3100 | if (!session_access_ok(session, uid, gid)) { | |
3101 | continue; | |
3102 | } | |
3103 | ||
3104 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3105 | struct ltt_ust_session *usess = session->ust_session; | |
3106 | ||
3107 | if (session->consumer->type == CONSUMER_DST_NET || | |
3108 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
3109 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
3110 | ret = build_network_session_path(sessions[i].path, | |
dec56f6c | 3111 | sizeof(sessions[i].path), session); |
2f77fc4b | 3112 | } else { |
dec56f6c | 3113 | ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s", |
2f77fc4b DG |
3114 | session->consumer->dst.trace_path); |
3115 | } | |
3116 | if (ret < 0) { | |
3117 | PERROR("snprintf session path"); | |
3118 | continue; | |
3119 | } | |
3120 | ||
3121 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
3122 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
8382cf6f | 3123 | sessions[i].enabled = session->active; |
2cbf8fed | 3124 | sessions[i].snapshot_mode = session->snapshot_mode; |
8960e9cd | 3125 | sessions[i].live_timer_interval = session->live_timer; |
2f77fc4b DG |
3126 | i++; |
3127 | } | |
3128 | } | |
3129 | ||
806e2684 | 3130 | /* |
6d805429 | 3131 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
d3f14b8a | 3132 | * ready for trace analysis (or any kind of reader) or else 1 for pending data. |
806e2684 | 3133 | */ |
6d805429 | 3134 | int cmd_data_pending(struct ltt_session *session) |
806e2684 DG |
3135 | { |
3136 | int ret; | |
3137 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3138 | struct ltt_ust_session *usess = session->ust_session; | |
3139 | ||
3140 | assert(session); | |
3141 | ||
3142 | /* Session MUST be stopped to ask for data availability. */ | |
8382cf6f | 3143 | if (session->active) { |
806e2684 DG |
3144 | ret = LTTNG_ERR_SESSION_STARTED; |
3145 | goto error; | |
3a89d11a DG |
3146 | } else { |
3147 | /* | |
3148 | * If stopped, just make sure we've started before else the above call | |
3149 | * will always send that there is data pending. | |
3150 | * | |
3151 | * The consumer assumes that when the data pending command is received, | |
3152 | * the trace has been started before or else no output data is written | |
3153 | * by the streams which is a condition for data pending. So, this is | |
3154 | * *VERY* important that we don't ask the consumer before a start | |
3155 | * trace. | |
3156 | */ | |
8382cf6f | 3157 | if (!session->has_been_started) { |
3a89d11a DG |
3158 | ret = 0; |
3159 | goto error; | |
3160 | } | |
806e2684 DG |
3161 | } |
3162 | ||
3163 | if (ksess && ksess->consumer) { | |
6d805429 DG |
3164 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
3165 | if (ret == 1) { | |
806e2684 DG |
3166 | /* Data is still being extracted for the kernel. */ |
3167 | goto error; | |
3168 | } | |
3169 | } | |
3170 | ||
3171 | if (usess && usess->consumer) { | |
6d805429 DG |
3172 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
3173 | if (ret == 1) { | |
806e2684 DG |
3174 | /* Data is still being extracted for the kernel. */ |
3175 | goto error; | |
3176 | } | |
3177 | } | |
3178 | ||
3179 | /* Data is ready to be read by a viewer */ | |
6d805429 | 3180 | ret = 0; |
806e2684 DG |
3181 | |
3182 | error: | |
3183 | return ret; | |
3184 | } | |
3185 | ||
6dc3064a DG |
3186 | /* |
3187 | * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library. | |
3188 | * | |
3189 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3190 | */ | |
3191 | int cmd_snapshot_add_output(struct ltt_session *session, | |
3192 | struct lttng_snapshot_output *output, uint32_t *id) | |
3193 | { | |
3194 | int ret; | |
3195 | struct snapshot_output *new_output; | |
3196 | ||
3197 | assert(session); | |
3198 | assert(output); | |
3199 | ||
3200 | DBG("Cmd snapshot add output for session %s", session->name); | |
3201 | ||
3202 | /* | |
d3f14b8a MD |
3203 | * Permission denied to create an output if the session is not |
3204 | * set in no output mode. | |
6dc3064a DG |
3205 | */ |
3206 | if (session->output_traces) { | |
3207 | ret = LTTNG_ERR_EPERM; | |
3208 | goto error; | |
3209 | } | |
3210 | ||
3211 | /* Only one output is allowed until we have the "tee" feature. */ | |
3212 | if (session->snapshot.nb_output == 1) { | |
3213 | ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST; | |
3214 | goto error; | |
3215 | } | |
3216 | ||
3217 | new_output = snapshot_output_alloc(); | |
3218 | if (!new_output) { | |
3219 | ret = LTTNG_ERR_NOMEM; | |
3220 | goto error; | |
3221 | } | |
3222 | ||
3223 | ret = snapshot_output_init(output->max_size, output->name, | |
3224 | output->ctrl_url, output->data_url, session->consumer, new_output, | |
3225 | &session->snapshot); | |
3226 | if (ret < 0) { | |
3227 | if (ret == -ENOMEM) { | |
3228 | ret = LTTNG_ERR_NOMEM; | |
3229 | } else { | |
3230 | ret = LTTNG_ERR_INVALID; | |
3231 | } | |
3232 | goto free_error; | |
3233 | } | |
3234 | ||
6dc3064a DG |
3235 | rcu_read_lock(); |
3236 | snapshot_add_output(&session->snapshot, new_output); | |
3237 | if (id) { | |
3238 | *id = new_output->id; | |
3239 | } | |
3240 | rcu_read_unlock(); | |
3241 | ||
3242 | return LTTNG_OK; | |
3243 | ||
3244 | free_error: | |
3245 | snapshot_output_destroy(new_output); | |
3246 | error: | |
3247 | return ret; | |
3248 | } | |
3249 | ||
3250 | /* | |
3251 | * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl. | |
3252 | * | |
3253 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3254 | */ | |
3255 | int cmd_snapshot_del_output(struct ltt_session *session, | |
3256 | struct lttng_snapshot_output *output) | |
3257 | { | |
3258 | int ret; | |
eb240553 | 3259 | struct snapshot_output *sout = NULL; |
6dc3064a DG |
3260 | |
3261 | assert(session); | |
3262 | assert(output); | |
3263 | ||
6dc3064a DG |
3264 | rcu_read_lock(); |
3265 | ||
3266 | /* | |
d3f14b8a MD |
3267 | * Permission denied to create an output if the session is not |
3268 | * set in no output mode. | |
6dc3064a DG |
3269 | */ |
3270 | if (session->output_traces) { | |
3271 | ret = LTTNG_ERR_EPERM; | |
3272 | goto error; | |
3273 | } | |
3274 | ||
eb240553 DG |
3275 | if (output->id) { |
3276 | DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id, | |
3277 | session->name); | |
3278 | sout = snapshot_find_output_by_id(output->id, &session->snapshot); | |
3279 | } else if (*output->name != '\0') { | |
3280 | DBG("Cmd snapshot del output name %s for session %s", output->name, | |
3281 | session->name); | |
3282 | sout = snapshot_find_output_by_name(output->name, &session->snapshot); | |
3283 | } | |
6dc3064a DG |
3284 | if (!sout) { |
3285 | ret = LTTNG_ERR_INVALID; | |
3286 | goto error; | |
3287 | } | |
3288 | ||
3289 | snapshot_delete_output(&session->snapshot, sout); | |
3290 | snapshot_output_destroy(sout); | |
3291 | ret = LTTNG_OK; | |
3292 | ||
3293 | error: | |
3294 | rcu_read_unlock(); | |
3295 | return ret; | |
3296 | } | |
3297 | ||
3298 | /* | |
3299 | * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl. | |
3300 | * | |
3301 | * If no output is available, outputs is untouched and 0 is returned. | |
3302 | * | |
3303 | * Return the size of the newly allocated outputs or a negative LTTNG_ERR code. | |
3304 | */ | |
3305 | ssize_t cmd_snapshot_list_outputs(struct ltt_session *session, | |
3306 | struct lttng_snapshot_output **outputs) | |
3307 | { | |
3308 | int ret, idx = 0; | |
b223ca94 | 3309 | struct lttng_snapshot_output *list = NULL; |
6dc3064a DG |
3310 | struct lttng_ht_iter iter; |
3311 | struct snapshot_output *output; | |
3312 | ||
3313 | assert(session); | |
3314 | assert(outputs); | |
3315 | ||
3316 | DBG("Cmd snapshot list outputs for session %s", session->name); | |
3317 | ||
3318 | /* | |
d3f14b8a MD |
3319 | * Permission denied to create an output if the session is not |
3320 | * set in no output mode. | |
6dc3064a DG |
3321 | */ |
3322 | if (session->output_traces) { | |
b223ca94 | 3323 | ret = -LTTNG_ERR_EPERM; |
6dc3064a DG |
3324 | goto error; |
3325 | } | |
3326 | ||
3327 | if (session->snapshot.nb_output == 0) { | |
3328 | ret = 0; | |
3329 | goto error; | |
3330 | } | |
3331 | ||
3332 | list = zmalloc(session->snapshot.nb_output * sizeof(*list)); | |
3333 | if (!list) { | |
b223ca94 | 3334 | ret = -LTTNG_ERR_NOMEM; |
6dc3064a DG |
3335 | goto error; |
3336 | } | |
3337 | ||
3338 | /* Copy list from session to the new list object. */ | |
b223ca94 | 3339 | rcu_read_lock(); |
6dc3064a DG |
3340 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter, |
3341 | output, node.node) { | |
3342 | assert(output->consumer); | |
3343 | list[idx].id = output->id; | |
3344 | list[idx].max_size = output->max_size; | |
3345 | strncpy(list[idx].name, output->name, sizeof(list[idx].name)); | |
3346 | if (output->consumer->type == CONSUMER_DST_LOCAL) { | |
3347 | strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path, | |
3348 | sizeof(list[idx].ctrl_url)); | |
3349 | } else { | |
3350 | /* Control URI. */ | |
3351 | ret = uri_to_str_url(&output->consumer->dst.net.control, | |
3352 | list[idx].ctrl_url, sizeof(list[idx].ctrl_url)); | |
3353 | if (ret < 0) { | |
b223ca94 JG |
3354 | ret = -LTTNG_ERR_NOMEM; |
3355 | goto error; | |
6dc3064a DG |
3356 | } |
3357 | ||
3358 | /* Data URI. */ | |
3359 | ret = uri_to_str_url(&output->consumer->dst.net.data, | |
3360 | list[idx].data_url, sizeof(list[idx].data_url)); | |
3361 | if (ret < 0) { | |
b223ca94 JG |
3362 | ret = -LTTNG_ERR_NOMEM; |
3363 | goto error; | |
6dc3064a DG |
3364 | } |
3365 | } | |
3366 | idx++; | |
3367 | } | |
3368 | ||
3369 | *outputs = list; | |
b223ca94 JG |
3370 | list = NULL; |
3371 | ret = session->snapshot.nb_output; | |
6dc3064a | 3372 | error: |
b223ca94 JG |
3373 | free(list); |
3374 | rcu_read_unlock(); | |
3375 | return ret; | |
6dc3064a DG |
3376 | } |
3377 | ||
93ec662e JD |
3378 | /* |
3379 | * Check if we can regenerate the metadata for this session. | |
3380 | * Only kernel, UST per-uid and non-live sessions are supported. | |
3381 | * | |
3382 | * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise. | |
3383 | */ | |
3384 | static | |
3385 | int check_metadata_regenerate_support(struct ltt_session *session) | |
3386 | { | |
3387 | int ret; | |
3388 | ||
3389 | assert(session); | |
3390 | ||
3391 | if (session->live_timer != 0) { | |
3392 | ret = LTTNG_ERR_LIVE_SESSION; | |
3393 | goto end; | |
3394 | } | |
3395 | if (!session->active) { | |
3396 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
3397 | goto end; | |
3398 | } | |
3399 | if (session->ust_session) { | |
3400 | switch (session->ust_session->buffer_type) { | |
3401 | case LTTNG_BUFFER_PER_UID: | |
3402 | break; | |
3403 | case LTTNG_BUFFER_PER_PID: | |
3404 | ret = LTTNG_ERR_PER_PID_SESSION; | |
3405 | goto end; | |
3406 | default: | |
3407 | assert(0); | |
3408 | ret = LTTNG_ERR_UNK; | |
3409 | goto end; | |
3410 | } | |
3411 | } | |
3412 | if (session->consumer->type == CONSUMER_DST_NET && | |
3413 | session->consumer->relay_minor_version < 8) { | |
3414 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; | |
3415 | goto end; | |
3416 | } | |
3417 | ret = 0; | |
3418 | ||
3419 | end: | |
3420 | return ret; | |
3421 | } | |
3422 | ||
3423 | static | |
3424 | int ust_metadata_regenerate(struct ltt_ust_session *usess) | |
3425 | { | |
3426 | int ret = 0; | |
3427 | struct buffer_reg_uid *uid_reg = NULL; | |
3428 | struct buffer_reg_session *session_reg = NULL; | |
3429 | ||
3430 | rcu_read_lock(); | |
3431 | cds_list_for_each_entry(uid_reg, &usess->buffer_reg_uid_list, lnode) { | |
3432 | struct ust_registry_session *registry; | |
3433 | struct ust_registry_channel *chan; | |
3434 | struct lttng_ht_iter iter_chan; | |
3435 | ||
3436 | session_reg = uid_reg->registry; | |
3437 | registry = session_reg->reg.ust; | |
3438 | ||
3439 | pthread_mutex_lock(®istry->lock); | |
3440 | registry->metadata_len_sent = 0; | |
3441 | memset(registry->metadata, 0, registry->metadata_alloc_len); | |
3442 | registry->metadata_len = 0; | |
3443 | registry->metadata_version++; | |
3444 | ret = ust_metadata_session_statedump(registry, NULL, | |
3445 | registry->major, registry->minor); | |
3446 | if (ret) { | |
3447 | pthread_mutex_unlock(®istry->lock); | |
3448 | ERR("Failed to generate session metadata (err = %d)", | |
3449 | ret); | |
3450 | goto end; | |
3451 | } | |
3452 | cds_lfht_for_each_entry(registry->channels->ht, &iter_chan.iter, | |
3453 | chan, node.node) { | |
3454 | struct ust_registry_event *event; | |
3455 | struct lttng_ht_iter iter_event; | |
3456 | ||
3457 | ret = ust_metadata_channel_statedump(registry, chan); | |
3458 | if (ret) { | |
3459 | pthread_mutex_unlock(®istry->lock); | |
3460 | ERR("Failed to generate channel metadata " | |
3461 | "(err = %d)", ret); | |
3462 | goto end; | |
3463 | } | |
3464 | cds_lfht_for_each_entry(chan->ht->ht, &iter_event.iter, | |
3465 | event, node.node) { | |
3466 | ret = ust_metadata_event_statedump(registry, | |
3467 | chan, event); | |
3468 | if (ret) { | |
3469 | pthread_mutex_unlock(®istry->lock); | |
3470 | ERR("Failed to generate event metadata " | |
3471 | "(err = %d)", ret); | |
3472 | goto end; | |
3473 | } | |
3474 | } | |
3475 | } | |
3476 | pthread_mutex_unlock(®istry->lock); | |
3477 | } | |
3478 | ||
3479 | end: | |
3480 | rcu_read_unlock(); | |
3481 | return ret; | |
3482 | } | |
3483 | ||
3484 | /* | |
3485 | * Command LTTNG_METADATA_REGENERATE from the lttng-ctl library. | |
3486 | * | |
3487 | * Ask the consumer to truncate the existing metadata file(s) and | |
3488 | * then regenerate the metadata. Live and per-pid sessions are not | |
3489 | * supported and return an error. | |
3490 | * | |
3491 | * Return 0 on success or else a LTTNG_ERR code. | |
3492 | */ | |
3493 | int cmd_metadata_regenerate(struct ltt_session *session) | |
3494 | { | |
3495 | int ret; | |
3496 | ||
3497 | assert(session); | |
3498 | ||
3499 | ret = check_metadata_regenerate_support(session); | |
3500 | if (ret) { | |
3501 | goto end; | |
3502 | } | |
3503 | ||
3504 | if (session->kernel_session) { | |
3505 | ret = kernctl_session_metadata_regenerate( | |
3506 | session->kernel_session->fd); | |
3507 | if (ret < 0) { | |
3508 | ERR("Failed to regenerate the kernel metadata"); | |
3509 | goto end; | |
3510 | } | |
3511 | } | |
3512 | ||
3513 | if (session->ust_session) { | |
3514 | ret = ust_metadata_regenerate(session->ust_session); | |
3515 | if (ret < 0) { | |
3516 | ERR("Failed to regenerate the UST metadata"); | |
3517 | goto end; | |
3518 | } | |
3519 | } | |
3520 | DBG("Cmd metadata regenerate for session %s", session->name); | |
3521 | ret = LTTNG_OK; | |
3522 | ||
3523 | end: | |
3524 | return ret; | |
3525 | } | |
3526 | ||
3527 | ||
6dc3064a DG |
3528 | /* |
3529 | * Send relayd sockets from snapshot output to consumer. Ignore request if the | |
3530 | * snapshot output is *not* set with a remote destination. | |
3531 | * | |
a934f4af | 3532 | * Return 0 on success or a LTTNG_ERR code. |
6dc3064a DG |
3533 | */ |
3534 | static int set_relayd_for_snapshot(struct consumer_output *consumer, | |
3535 | struct snapshot_output *snap_output, struct ltt_session *session) | |
3536 | { | |
a934f4af | 3537 | int ret = LTTNG_OK; |
6dc3064a DG |
3538 | struct lttng_ht_iter iter; |
3539 | struct consumer_socket *socket; | |
3540 | ||
3541 | assert(consumer); | |
3542 | assert(snap_output); | |
3543 | assert(session); | |
3544 | ||
3545 | DBG2("Set relayd object from snapshot output"); | |
3546 | ||
3547 | /* Ignore if snapshot consumer output is not network. */ | |
3548 | if (snap_output->consumer->type != CONSUMER_DST_NET) { | |
3549 | goto error; | |
3550 | } | |
3551 | ||
3552 | /* | |
3553 | * For each consumer socket, create and send the relayd object of the | |
3554 | * snapshot output. | |
3555 | */ | |
3556 | rcu_read_lock(); | |
5eecee74 DG |
3557 | cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter, |
3558 | socket, node.node) { | |
6dc3064a | 3559 | ret = send_consumer_relayd_sockets(0, session->id, |
d3e2ba59 JD |
3560 | snap_output->consumer, socket, |
3561 | session->name, session->hostname, | |
3562 | session->live_timer); | |
a934f4af | 3563 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3564 | rcu_read_unlock(); |
3565 | goto error; | |
3566 | } | |
3567 | } | |
3568 | rcu_read_unlock(); | |
3569 | ||
3570 | error: | |
3571 | return ret; | |
3572 | } | |
3573 | ||
3574 | /* | |
3575 | * Record a kernel snapshot. | |
3576 | * | |
fac41e72 | 3577 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a DG |
3578 | */ |
3579 | static int record_kernel_snapshot(struct ltt_kernel_session *ksess, | |
5c786ded | 3580 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3581 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3582 | { |
3583 | int ret; | |
3584 | ||
3585 | assert(ksess); | |
3586 | assert(output); | |
3587 | assert(session); | |
3588 | ||
10a50311 JD |
3589 | /* Get the datetime for the snapshot output directory. */ |
3590 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime, | |
3591 | sizeof(output->datetime)); | |
3592 | if (!ret) { | |
a934f4af | 3593 | ret = LTTNG_ERR_INVALID; |
10a50311 JD |
3594 | goto error; |
3595 | } | |
3596 | ||
af706bb7 DG |
3597 | /* |
3598 | * Copy kernel session sockets so we can communicate with the right | |
3599 | * consumer for the snapshot record command. | |
3600 | */ | |
3601 | ret = consumer_copy_sockets(output->consumer, ksess->consumer); | |
3602 | if (ret < 0) { | |
a934f4af | 3603 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3604 | goto error; |
6dc3064a DG |
3605 | } |
3606 | ||
3607 | ret = set_relayd_for_snapshot(ksess->consumer, output, session); | |
a934f4af | 3608 | if (ret != LTTNG_OK) { |
af706bb7 | 3609 | goto error_snapshot; |
6dc3064a DG |
3610 | } |
3611 | ||
d07ceecd | 3612 | ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream); |
2a06df8d | 3613 | if (ret != LTTNG_OK) { |
af706bb7 | 3614 | goto error_snapshot; |
6dc3064a DG |
3615 | } |
3616 | ||
a934f4af | 3617 | ret = LTTNG_OK; |
1371fc12 | 3618 | goto end; |
a934f4af | 3619 | |
af706bb7 DG |
3620 | error_snapshot: |
3621 | /* Clean up copied sockets so this output can use some other later on. */ | |
3622 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a | 3623 | error: |
1371fc12 | 3624 | end: |
6dc3064a DG |
3625 | return ret; |
3626 | } | |
3627 | ||
3628 | /* | |
3629 | * Record a UST snapshot. | |
3630 | * | |
a934f4af | 3631 | * Return 0 on success or a LTTNG_ERR error code. |
6dc3064a DG |
3632 | */ |
3633 | static int record_ust_snapshot(struct ltt_ust_session *usess, | |
5c786ded | 3634 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3635 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3636 | { |
3637 | int ret; | |
3638 | ||
3639 | assert(usess); | |
3640 | assert(output); | |
3641 | assert(session); | |
3642 | ||
10a50311 JD |
3643 | /* Get the datetime for the snapshot output directory. */ |
3644 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime, | |
3645 | sizeof(output->datetime)); | |
3646 | if (!ret) { | |
a934f4af | 3647 | ret = LTTNG_ERR_INVALID; |
10a50311 JD |
3648 | goto error; |
3649 | } | |
3650 | ||
af706bb7 | 3651 | /* |
d3f14b8a | 3652 | * Copy UST session sockets so we can communicate with the right |
af706bb7 DG |
3653 | * consumer for the snapshot record command. |
3654 | */ | |
3655 | ret = consumer_copy_sockets(output->consumer, usess->consumer); | |
3656 | if (ret < 0) { | |
a934f4af | 3657 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3658 | goto error; |
6dc3064a DG |
3659 | } |
3660 | ||
3661 | ret = set_relayd_for_snapshot(usess->consumer, output, session); | |
a934f4af | 3662 | if (ret != LTTNG_OK) { |
af706bb7 | 3663 | goto error_snapshot; |
6dc3064a DG |
3664 | } |
3665 | ||
d07ceecd | 3666 | ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream); |
6dc3064a | 3667 | if (ret < 0) { |
7badf927 DG |
3668 | switch (-ret) { |
3669 | case EINVAL: | |
a934f4af | 3670 | ret = LTTNG_ERR_INVALID; |
7badf927 DG |
3671 | break; |
3672 | case ENODATA: | |
3673 | ret = LTTNG_ERR_SNAPSHOT_NODATA; | |
3674 | break; | |
3675 | default: | |
3676 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
3677 | break; | |
5c786ded | 3678 | } |
af706bb7 | 3679 | goto error_snapshot; |
6dc3064a DG |
3680 | } |
3681 | ||
a934f4af DG |
3682 | ret = LTTNG_OK; |
3683 | ||
af706bb7 DG |
3684 | error_snapshot: |
3685 | /* Clean up copied sockets so this output can use some other later on. */ | |
3686 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a DG |
3687 | error: |
3688 | return ret; | |
3689 | } | |
3690 | ||
d07ceecd MD |
3691 | static |
3692 | uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session, | |
3693 | uint64_t cur_nr_packets) | |
68808f4e | 3694 | { |
d07ceecd | 3695 | uint64_t tot_size = 0; |
68808f4e DG |
3696 | |
3697 | if (session->kernel_session) { | |
3698 | struct ltt_kernel_channel *chan; | |
3699 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3700 | ||
68808f4e | 3701 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
d07ceecd MD |
3702 | if (cur_nr_packets >= chan->channel->attr.num_subbuf) { |
3703 | /* | |
3704 | * Don't take channel into account if we | |
3705 | * already grab all its packets. | |
3706 | */ | |
3707 | continue; | |
68808f4e | 3708 | } |
d07ceecd MD |
3709 | tot_size += chan->channel->attr.subbuf_size |
3710 | * chan->stream_count; | |
68808f4e DG |
3711 | } |
3712 | } | |
3713 | ||
3714 | if (session->ust_session) { | |
68808f4e DG |
3715 | struct ltt_ust_session *usess = session->ust_session; |
3716 | ||
d07ceecd MD |
3717 | tot_size += ust_app_get_size_one_more_packet_per_stream(usess, |
3718 | cur_nr_packets); | |
68808f4e DG |
3719 | } |
3720 | ||
d07ceecd | 3721 | return tot_size; |
68808f4e DG |
3722 | } |
3723 | ||
5c786ded | 3724 | /* |
d07ceecd MD |
3725 | * Calculate the number of packets we can grab from each stream that |
3726 | * fits within the overall snapshot max size. | |
3727 | * | |
3728 | * Returns -1 on error, 0 means infinite number of packets, else > 0 is | |
3729 | * the number of packets per stream. | |
3730 | * | |
3731 | * TODO: this approach is not perfect: we consider the worse case | |
3732 | * (packet filling the sub-buffers) as an upper bound, but we could do | |
3733 | * better if we do this calculation while we actually grab the packet | |
3734 | * content: we would know how much padding we don't actually store into | |
3735 | * the file. | |
3736 | * | |
3737 | * This algorithm is currently bounded by the number of packets per | |
3738 | * stream. | |
3739 | * | |
3740 | * Since we call this algorithm before actually grabbing the data, it's | |
3741 | * an approximation: for instance, applications could appear/disappear | |
3742 | * in between this call and actually grabbing data. | |
5c786ded | 3743 | */ |
d07ceecd MD |
3744 | static |
3745 | int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size) | |
5c786ded | 3746 | { |
d07ceecd MD |
3747 | int64_t size_left; |
3748 | uint64_t cur_nb_packets = 0; | |
5c786ded | 3749 | |
d07ceecd MD |
3750 | if (!max_size) { |
3751 | return 0; /* Infinite */ | |
5c786ded JD |
3752 | } |
3753 | ||
d07ceecd MD |
3754 | size_left = max_size; |
3755 | for (;;) { | |
3756 | uint64_t one_more_packet_tot_size; | |
5c786ded | 3757 | |
d07ceecd MD |
3758 | one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session, |
3759 | cur_nb_packets); | |
3760 | if (!one_more_packet_tot_size) { | |
3761 | /* We are already grabbing all packets. */ | |
3762 | break; | |
3763 | } | |
3764 | size_left -= one_more_packet_tot_size; | |
3765 | if (size_left < 0) { | |
3766 | break; | |
3767 | } | |
3768 | cur_nb_packets++; | |
5c786ded | 3769 | } |
d07ceecd MD |
3770 | if (!cur_nb_packets) { |
3771 | /* Not enough room to grab one packet of each stream, error. */ | |
3772 | return -1; | |
3773 | } | |
3774 | return cur_nb_packets; | |
5c786ded JD |
3775 | } |
3776 | ||
6dc3064a DG |
3777 | /* |
3778 | * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl. | |
3779 | * | |
3780 | * The wait parameter is ignored so this call always wait for the snapshot to | |
3781 | * complete before returning. | |
3782 | * | |
3783 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3784 | */ | |
3785 | int cmd_snapshot_record(struct ltt_session *session, | |
3786 | struct lttng_snapshot_output *output, int wait) | |
3787 | { | |
3788 | int ret = LTTNG_OK; | |
e1986656 DG |
3789 | unsigned int use_tmp_output = 0; |
3790 | struct snapshot_output tmp_output; | |
00e1dfc4 | 3791 | unsigned int snapshot_success = 0; |
6dc3064a DG |
3792 | |
3793 | assert(session); | |
ba45d9f0 | 3794 | assert(output); |
6dc3064a DG |
3795 | |
3796 | DBG("Cmd snapshot record for session %s", session->name); | |
3797 | ||
3798 | /* | |
d3f14b8a MD |
3799 | * Permission denied to create an output if the session is not |
3800 | * set in no output mode. | |
6dc3064a DG |
3801 | */ |
3802 | if (session->output_traces) { | |
3803 | ret = LTTNG_ERR_EPERM; | |
3804 | goto error; | |
3805 | } | |
3806 | ||
3807 | /* The session needs to be started at least once. */ | |
8382cf6f | 3808 | if (!session->has_been_started) { |
6dc3064a DG |
3809 | ret = LTTNG_ERR_START_SESSION_ONCE; |
3810 | goto error; | |
3811 | } | |
3812 | ||
3813 | /* Use temporary output for the session. */ | |
ba45d9f0 | 3814 | if (*output->ctrl_url != '\0') { |
6dc3064a DG |
3815 | ret = snapshot_output_init(output->max_size, output->name, |
3816 | output->ctrl_url, output->data_url, session->consumer, | |
e1986656 | 3817 | &tmp_output, NULL); |
6dc3064a DG |
3818 | if (ret < 0) { |
3819 | if (ret == -ENOMEM) { | |
3820 | ret = LTTNG_ERR_NOMEM; | |
3821 | } else { | |
3822 | ret = LTTNG_ERR_INVALID; | |
3823 | } | |
3824 | goto error; | |
3825 | } | |
1bfe7328 DG |
3826 | /* Use the global session count for the temporary snapshot. */ |
3827 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; | |
e1986656 | 3828 | use_tmp_output = 1; |
6dc3064a DG |
3829 | } |
3830 | ||
3831 | if (session->kernel_session) { | |
3832 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3833 | ||
e1986656 | 3834 | if (use_tmp_output) { |
d07ceecd MD |
3835 | int64_t nb_packets_per_stream; |
3836 | ||
3837 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
3838 | tmp_output.max_size); | |
3839 | if (nb_packets_per_stream < 0) { | |
3840 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
3841 | goto error; | |
3842 | } | |
e1986656 | 3843 | ret = record_kernel_snapshot(ksess, &tmp_output, session, |
d07ceecd | 3844 | wait, nb_packets_per_stream); |
a934f4af | 3845 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3846 | goto error; |
3847 | } | |
1bfe7328 | 3848 | snapshot_success = 1; |
6dc3064a DG |
3849 | } else { |
3850 | struct snapshot_output *sout; | |
3851 | struct lttng_ht_iter iter; | |
3852 | ||
3853 | rcu_read_lock(); | |
3854 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
3855 | &iter.iter, sout, node.node) { | |
d07ceecd MD |
3856 | int64_t nb_packets_per_stream; |
3857 | ||
e1986656 DG |
3858 | /* |
3859 | * Make a local copy of the output and assign the possible | |
3860 | * temporary value given by the caller. | |
3861 | */ | |
3862 | memset(&tmp_output, 0, sizeof(tmp_output)); | |
3863 | memcpy(&tmp_output, sout, sizeof(tmp_output)); | |
3864 | ||
e1986656 DG |
3865 | if (output->max_size != (uint64_t) -1ULL) { |
3866 | tmp_output.max_size = output->max_size; | |
3867 | } | |
3868 | ||
d07ceecd MD |
3869 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, |
3870 | tmp_output.max_size); | |
3871 | if (nb_packets_per_stream < 0) { | |
68808f4e DG |
3872 | ret = LTTNG_ERR_MAX_SIZE_INVALID; |
3873 | goto error; | |
3874 | } | |
3875 | ||
e1986656 DG |
3876 | /* Use temporary name. */ |
3877 | if (*output->name != '\0') { | |
3878 | strncpy(tmp_output.name, output->name, | |
3879 | sizeof(tmp_output.name)); | |
3880 | } | |
3881 | ||
1bfe7328 DG |
3882 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; |
3883 | ||
e1986656 | 3884 | ret = record_kernel_snapshot(ksess, &tmp_output, |
d07ceecd | 3885 | session, wait, nb_packets_per_stream); |
a934f4af | 3886 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3887 | rcu_read_unlock(); |
3888 | goto error; | |
3889 | } | |
1bfe7328 | 3890 | snapshot_success = 1; |
6dc3064a DG |
3891 | } |
3892 | rcu_read_unlock(); | |
3893 | } | |
3894 | } | |
3895 | ||
3896 | if (session->ust_session) { | |
3897 | struct ltt_ust_session *usess = session->ust_session; | |
3898 | ||
e1986656 | 3899 | if (use_tmp_output) { |
d07ceecd MD |
3900 | int64_t nb_packets_per_stream; |
3901 | ||
3902 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
3903 | tmp_output.max_size); | |
3904 | if (nb_packets_per_stream < 0) { | |
3905 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
3906 | goto error; | |
3907 | } | |
e1986656 | 3908 | ret = record_ust_snapshot(usess, &tmp_output, session, |
d07ceecd | 3909 | wait, nb_packets_per_stream); |
a934f4af | 3910 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3911 | goto error; |
3912 | } | |
1bfe7328 | 3913 | snapshot_success = 1; |
6dc3064a DG |
3914 | } else { |
3915 | struct snapshot_output *sout; | |
3916 | struct lttng_ht_iter iter; | |
3917 | ||
3918 | rcu_read_lock(); | |
3919 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
3920 | &iter.iter, sout, node.node) { | |
d07ceecd MD |
3921 | int64_t nb_packets_per_stream; |
3922 | ||
e1986656 DG |
3923 | /* |
3924 | * Make a local copy of the output and assign the possible | |
3925 | * temporary value given by the caller. | |
3926 | */ | |
3927 | memset(&tmp_output, 0, sizeof(tmp_output)); | |
3928 | memcpy(&tmp_output, sout, sizeof(tmp_output)); | |
3929 | ||
e1986656 DG |
3930 | if (output->max_size != (uint64_t) -1ULL) { |
3931 | tmp_output.max_size = output->max_size; | |
3932 | } | |
3933 | ||
d07ceecd MD |
3934 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, |
3935 | tmp_output.max_size); | |
3936 | if (nb_packets_per_stream < 0) { | |
68808f4e | 3937 | ret = LTTNG_ERR_MAX_SIZE_INVALID; |
d07ceecd | 3938 | rcu_read_unlock(); |
68808f4e DG |
3939 | goto error; |
3940 | } | |
3941 | ||
e1986656 DG |
3942 | /* Use temporary name. */ |
3943 | if (*output->name != '\0') { | |
3944 | strncpy(tmp_output.name, output->name, | |
3945 | sizeof(tmp_output.name)); | |
3946 | } | |
3947 | ||
1bfe7328 DG |
3948 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; |
3949 | ||
e1986656 | 3950 | ret = record_ust_snapshot(usess, &tmp_output, session, |
d07ceecd | 3951 | wait, nb_packets_per_stream); |
a934f4af | 3952 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3953 | rcu_read_unlock(); |
3954 | goto error; | |
3955 | } | |
1bfe7328 | 3956 | snapshot_success = 1; |
6dc3064a DG |
3957 | } |
3958 | rcu_read_unlock(); | |
3959 | } | |
3960 | } | |
3961 | ||
1bfe7328 DG |
3962 | if (snapshot_success) { |
3963 | session->snapshot.nb_snapshot++; | |
b67578cb MD |
3964 | } else { |
3965 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
1bfe7328 DG |
3966 | } |
3967 | ||
6dc3064a | 3968 | error: |
6dc3064a DG |
3969 | return ret; |
3970 | } | |
3971 | ||
d7ba1388 MD |
3972 | /* |
3973 | * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread. | |
3974 | */ | |
3975 | int cmd_set_session_shm_path(struct ltt_session *session, | |
3976 | const char *shm_path) | |
3977 | { | |
3978 | /* Safety net */ | |
3979 | assert(session); | |
3980 | ||
3981 | /* | |
3982 | * Can only set shm path before session is started. | |
3983 | */ | |
3984 | if (session->has_been_started) { | |
3985 | return LTTNG_ERR_SESSION_STARTED; | |
3986 | } | |
3987 | ||
3988 | strncpy(session->shm_path, shm_path, | |
3989 | sizeof(session->shm_path)); | |
3990 | session->shm_path[sizeof(session->shm_path) - 1] = '\0'; | |
3991 | ||
3992 | return 0; | |
3993 | } | |
3994 | ||
2f77fc4b DG |
3995 | /* |
3996 | * Init command subsystem. | |
3997 | */ | |
3998 | void cmd_init(void) | |
3999 | { | |
4000 | /* | |
d88aee68 DG |
4001 | * Set network sequence index to 1 for streams to match a relayd |
4002 | * socket on the consumer side. | |
2f77fc4b | 4003 | */ |
d88aee68 DG |
4004 | pthread_mutex_lock(&relayd_net_seq_idx_lock); |
4005 | relayd_net_seq_idx = 1; | |
4006 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
4007 | |
4008 | DBG("Command subsystem initialized"); | |
4009 | } |