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> |
b0880ae5 JG |
32 | #include <common/dynamic-buffer.h> |
33 | #include <common/buffer-view.h> | |
34 | #include <lttng/trigger/trigger-internal.h> | |
35 | #include <lttng/condition/condition.h> | |
36 | #include <lttng/action/action.h> | |
37 | #include <lttng/channel-internal.h> | |
9f449915 | 38 | #include <common/string-utils/string-utils.h> |
2f77fc4b DG |
39 | |
40 | #include "channel.h" | |
41 | #include "consumer.h" | |
42 | #include "event.h" | |
8782cc74 | 43 | #include "health-sessiond.h" |
2f77fc4b DG |
44 | #include "kernel.h" |
45 | #include "kernel-consumer.h" | |
46 | #include "lttng-sessiond.h" | |
47 | #include "utils.h" | |
834978fd | 48 | #include "syscall.h" |
7c1d2758 | 49 | #include "agent.h" |
93ec662e | 50 | #include "buffer-registry.h" |
b0880ae5 JG |
51 | #include "notification-thread.h" |
52 | #include "notification-thread-commands.h" | |
2f77fc4b DG |
53 | |
54 | #include "cmd.h" | |
55 | ||
56 | /* | |
57 | * Used to keep a unique index for each relayd socket created where this value | |
58 | * is associated with streams on the consumer so it can match the right relayd | |
d88aee68 DG |
59 | * to send to. It must be accessed with the relayd_net_seq_idx_lock |
60 | * held. | |
2f77fc4b | 61 | */ |
d88aee68 DG |
62 | static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER; |
63 | static uint64_t relayd_net_seq_idx; | |
2f77fc4b | 64 | |
7076b56e JG |
65 | static int validate_ust_event_name(const char *); |
66 | static int cmd_enable_event_internal(struct ltt_session *session, | |
67 | struct lttng_domain *domain, | |
68 | char *channel_name, struct lttng_event *event, | |
69 | char *filter_expression, | |
70 | struct lttng_filter_bytecode *filter, | |
71 | struct lttng_event_exclusion *exclusion, | |
72 | int wpipe); | |
73 | ||
2f77fc4b DG |
74 | /* |
75 | * Create a session path used by list_lttng_sessions for the case that the | |
76 | * session consumer is on the network. | |
77 | */ | |
78 | static int build_network_session_path(char *dst, size_t size, | |
79 | struct ltt_session *session) | |
80 | { | |
81 | int ret, kdata_port, udata_port; | |
82 | struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL; | |
83 | char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX]; | |
84 | ||
85 | assert(session); | |
86 | assert(dst); | |
87 | ||
88 | memset(tmp_urls, 0, sizeof(tmp_urls)); | |
89 | memset(tmp_uurl, 0, sizeof(tmp_uurl)); | |
90 | ||
91 | kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT; | |
92 | ||
93 | if (session->kernel_session && session->kernel_session->consumer) { | |
94 | kuri = &session->kernel_session->consumer->dst.net.control; | |
95 | kdata_port = session->kernel_session->consumer->dst.net.data.port; | |
96 | } | |
97 | ||
98 | if (session->ust_session && session->ust_session->consumer) { | |
99 | uuri = &session->ust_session->consumer->dst.net.control; | |
100 | udata_port = session->ust_session->consumer->dst.net.data.port; | |
101 | } | |
102 | ||
103 | if (uuri == NULL && kuri == NULL) { | |
104 | uri = &session->consumer->dst.net.control; | |
105 | kdata_port = session->consumer->dst.net.data.port; | |
106 | } else if (kuri && uuri) { | |
107 | ret = uri_compare(kuri, uuri); | |
108 | if (ret) { | |
109 | /* Not Equal */ | |
110 | uri = kuri; | |
111 | /* Build uuri URL string */ | |
112 | ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl)); | |
113 | if (ret < 0) { | |
114 | goto error; | |
115 | } | |
116 | } else { | |
117 | uri = kuri; | |
118 | } | |
119 | } else if (kuri && uuri == NULL) { | |
120 | uri = kuri; | |
121 | } else if (uuri && kuri == NULL) { | |
122 | uri = uuri; | |
123 | } | |
124 | ||
125 | ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls)); | |
126 | if (ret < 0) { | |
127 | goto error; | |
128 | } | |
129 | ||
9aa9f900 DG |
130 | /* |
131 | * Do we have a UST url set. If yes, this means we have both kernel and UST | |
132 | * to print. | |
133 | */ | |
9d035200 | 134 | if (*tmp_uurl != '\0') { |
2f77fc4b DG |
135 | ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]", |
136 | tmp_urls, kdata_port, tmp_uurl, udata_port); | |
137 | } else { | |
9aa9f900 | 138 | int dport; |
bef08707 | 139 | if (kuri || (!kuri && !uuri)) { |
9aa9f900 DG |
140 | dport = kdata_port; |
141 | } else { | |
142 | /* No kernel URI, use the UST port. */ | |
143 | dport = udata_port; | |
144 | } | |
145 | ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport); | |
2f77fc4b DG |
146 | } |
147 | ||
148 | error: | |
149 | return ret; | |
150 | } | |
151 | ||
fb83fe64 JD |
152 | /* |
153 | * Get run-time attributes if the session has been started (discarded events, | |
154 | * lost packets). | |
155 | */ | |
156 | static int get_kernel_runtime_stats(struct ltt_session *session, | |
157 | struct ltt_kernel_channel *kchan, uint64_t *discarded_events, | |
158 | uint64_t *lost_packets) | |
159 | { | |
160 | int ret; | |
161 | ||
162 | if (!session->has_been_started) { | |
163 | ret = 0; | |
164 | *discarded_events = 0; | |
165 | *lost_packets = 0; | |
166 | goto end; | |
167 | } | |
168 | ||
169 | ret = consumer_get_discarded_events(session->id, kchan->fd, | |
170 | session->kernel_session->consumer, | |
171 | discarded_events); | |
172 | if (ret < 0) { | |
173 | goto end; | |
174 | } | |
175 | ||
176 | ret = consumer_get_lost_packets(session->id, kchan->fd, | |
177 | session->kernel_session->consumer, | |
178 | lost_packets); | |
179 | if (ret < 0) { | |
180 | goto end; | |
181 | } | |
182 | ||
183 | end: | |
184 | return ret; | |
185 | } | |
186 | ||
187 | /* | |
188 | * Get run-time attributes if the session has been started (discarded events, | |
189 | * lost packets). | |
190 | */ | |
191 | static int get_ust_runtime_stats(struct ltt_session *session, | |
192 | struct ltt_ust_channel *uchan, uint64_t *discarded_events, | |
193 | uint64_t *lost_packets) | |
194 | { | |
195 | int ret; | |
196 | struct ltt_ust_session *usess; | |
197 | ||
a91c5803 JG |
198 | if (!discarded_events || !lost_packets) { |
199 | ret = -1; | |
200 | goto end; | |
201 | } | |
202 | ||
fb83fe64 | 203 | usess = session->ust_session; |
a905c624 JG |
204 | assert(discarded_events); |
205 | assert(lost_packets); | |
fb83fe64 JD |
206 | |
207 | if (!usess || !session->has_been_started) { | |
208 | *discarded_events = 0; | |
209 | *lost_packets = 0; | |
210 | ret = 0; | |
211 | goto end; | |
212 | } | |
213 | ||
214 | if (usess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
215 | ret = ust_app_uid_get_channel_runtime_stats(usess->id, | |
216 | &usess->buffer_reg_uid_list, | |
217 | usess->consumer, uchan->id, | |
218 | uchan->attr.overwrite, | |
219 | discarded_events, | |
220 | lost_packets); | |
221 | } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
222 | ret = ust_app_pid_get_channel_runtime_stats(usess, | |
223 | uchan, usess->consumer, | |
224 | uchan->attr.overwrite, | |
225 | discarded_events, | |
226 | lost_packets); | |
227 | if (ret < 0) { | |
228 | goto end; | |
229 | } | |
230 | *discarded_events += uchan->per_pid_closed_app_discarded; | |
231 | *lost_packets += uchan->per_pid_closed_app_lost; | |
232 | } else { | |
233 | ERR("Unsupported buffer type"); | |
967bc289 | 234 | assert(0); |
fb83fe64 JD |
235 | ret = -1; |
236 | goto end; | |
237 | } | |
238 | ||
239 | end: | |
240 | return ret; | |
241 | } | |
242 | ||
2f77fc4b DG |
243 | /* |
244 | * Fill lttng_channel array of all channels. | |
245 | */ | |
56a37563 | 246 | static void list_lttng_channels(enum lttng_domain_type domain, |
fb83fe64 | 247 | struct ltt_session *session, struct lttng_channel *channels, |
cf0bcb51 | 248 | struct lttng_channel_extended *chan_exts) |
2f77fc4b | 249 | { |
fb83fe64 | 250 | int i = 0, ret; |
2f77fc4b DG |
251 | struct ltt_kernel_channel *kchan; |
252 | ||
253 | DBG("Listing channels for session %s", session->name); | |
254 | ||
255 | switch (domain) { | |
256 | case LTTNG_DOMAIN_KERNEL: | |
257 | /* Kernel channels */ | |
258 | if (session->kernel_session != NULL) { | |
259 | cds_list_for_each_entry(kchan, | |
260 | &session->kernel_session->channel_list.head, list) { | |
fb83fe64 | 261 | uint64_t discarded_events, lost_packets; |
cf0bcb51 JG |
262 | struct lttng_channel_extended *extended; |
263 | ||
264 | extended = (struct lttng_channel_extended *) | |
265 | kchan->channel->attr.extended.ptr; | |
fb83fe64 JD |
266 | |
267 | ret = get_kernel_runtime_stats(session, kchan, | |
268 | &discarded_events, &lost_packets); | |
269 | if (ret < 0) { | |
270 | goto end; | |
271 | } | |
2f77fc4b DG |
272 | /* Copy lttng_channel struct to array */ |
273 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
274 | channels[i].enabled = kchan->enabled; | |
fb83fe64 JD |
275 | chan_exts[i].discarded_events = |
276 | discarded_events; | |
277 | chan_exts[i].lost_packets = lost_packets; | |
cf0bcb51 JG |
278 | chan_exts[i].monitor_timer_interval = |
279 | extended->monitor_timer_interval; | |
2f77fc4b DG |
280 | i++; |
281 | } | |
282 | } | |
283 | break; | |
284 | case LTTNG_DOMAIN_UST: | |
285 | { | |
286 | struct lttng_ht_iter iter; | |
287 | struct ltt_ust_channel *uchan; | |
288 | ||
e7fe706f | 289 | rcu_read_lock(); |
2f77fc4b DG |
290 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
291 | &iter.iter, uchan, node.node) { | |
a91c5803 | 292 | uint64_t discarded_events = 0, lost_packets = 0; |
fb83fe64 | 293 | |
8ee609c8 MD |
294 | if (lttng_strncpy(channels[i].name, uchan->name, |
295 | LTTNG_SYMBOL_NAME_LEN)) { | |
296 | break; | |
297 | } | |
2f77fc4b DG |
298 | channels[i].attr.overwrite = uchan->attr.overwrite; |
299 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
300 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
301 | channels[i].attr.switch_timer_interval = | |
302 | uchan->attr.switch_timer_interval; | |
303 | channels[i].attr.read_timer_interval = | |
304 | uchan->attr.read_timer_interval; | |
305 | channels[i].enabled = uchan->enabled; | |
2f785fe7 DG |
306 | channels[i].attr.tracefile_size = uchan->tracefile_size; |
307 | channels[i].attr.tracefile_count = uchan->tracefile_count; | |
5e4435a4 JG |
308 | |
309 | /* | |
310 | * Map enum lttng_ust_output to enum lttng_event_output. | |
311 | */ | |
2f77fc4b DG |
312 | switch (uchan->attr.output) { |
313 | case LTTNG_UST_MMAP: | |
2f77fc4b DG |
314 | channels[i].attr.output = LTTNG_EVENT_MMAP; |
315 | break; | |
5e4435a4 JG |
316 | default: |
317 | /* | |
318 | * LTTNG_UST_MMAP is the only supported UST | |
319 | * output mode. | |
320 | */ | |
321 | assert(0); | |
322 | break; | |
2f77fc4b | 323 | } |
fb83fe64 JD |
324 | |
325 | ret = get_ust_runtime_stats(session, uchan, | |
326 | &discarded_events, &lost_packets); | |
327 | if (ret < 0) { | |
328 | break; | |
329 | } | |
330 | chan_exts[i].discarded_events = discarded_events; | |
331 | chan_exts[i].lost_packets = lost_packets; | |
cf0bcb51 JG |
332 | chan_exts[i].monitor_timer_interval = |
333 | uchan->monitor_timer_interval; | |
2f77fc4b DG |
334 | i++; |
335 | } | |
e7fe706f | 336 | rcu_read_unlock(); |
2f77fc4b DG |
337 | break; |
338 | } | |
339 | default: | |
340 | break; | |
341 | } | |
fb83fe64 JD |
342 | |
343 | end: | |
344 | return; | |
2f77fc4b DG |
345 | } |
346 | ||
b4e3ceb9 | 347 | static void increment_extended_len(const char *filter_expression, |
795d57ce | 348 | struct lttng_event_exclusion *exclusion, size_t *extended_len) |
b4e3ceb9 PP |
349 | { |
350 | *extended_len += sizeof(struct lttcomm_event_extended_header); | |
351 | ||
352 | if (filter_expression) { | |
353 | *extended_len += strlen(filter_expression) + 1; | |
354 | } | |
795d57ce PP |
355 | |
356 | if (exclusion) { | |
357 | *extended_len += exclusion->count * LTTNG_SYMBOL_NAME_LEN; | |
358 | } | |
b4e3ceb9 PP |
359 | } |
360 | ||
361 | static void append_extended_info(const char *filter_expression, | |
795d57ce | 362 | struct lttng_event_exclusion *exclusion, void **extended_at) |
b4e3ceb9 PP |
363 | { |
364 | struct lttcomm_event_extended_header extended_header; | |
365 | size_t filter_len = 0; | |
795d57ce | 366 | size_t nb_exclusions = 0; |
b4e3ceb9 PP |
367 | |
368 | if (filter_expression) { | |
369 | filter_len = strlen(filter_expression) + 1; | |
370 | } | |
371 | ||
795d57ce PP |
372 | if (exclusion) { |
373 | nb_exclusions = exclusion->count; | |
374 | } | |
375 | ||
376 | /* Set header fields */ | |
b4e3ceb9 | 377 | extended_header.filter_len = filter_len; |
795d57ce PP |
378 | extended_header.nb_exclusions = nb_exclusions; |
379 | ||
380 | /* Copy header */ | |
b4e3ceb9 PP |
381 | memcpy(*extended_at, &extended_header, sizeof(extended_header)); |
382 | *extended_at += sizeof(extended_header); | |
795d57ce PP |
383 | |
384 | /* Copy filter string */ | |
385 | if (filter_expression) { | |
386 | memcpy(*extended_at, filter_expression, filter_len); | |
387 | *extended_at += filter_len; | |
388 | } | |
389 | ||
390 | /* Copy exclusion names */ | |
391 | if (exclusion) { | |
392 | size_t len = nb_exclusions * LTTNG_SYMBOL_NAME_LEN; | |
393 | ||
394 | memcpy(*extended_at, &exclusion->names, len); | |
395 | *extended_at += len; | |
396 | } | |
b4e3ceb9 PP |
397 | } |
398 | ||
3c6a091f | 399 | /* |
022d91ba | 400 | * Create a list of agent domain events. |
3c6a091f DG |
401 | * |
402 | * Return number of events in list on success or else a negative value. | |
403 | */ | |
022d91ba | 404 | static int list_lttng_agent_events(struct agent *agt, |
b4e3ceb9 | 405 | struct lttng_event **events, size_t *total_size) |
3c6a091f DG |
406 | { |
407 | int i = 0, ret = 0; | |
408 | unsigned int nb_event = 0; | |
022d91ba | 409 | struct agent_event *event; |
3c6a091f DG |
410 | struct lttng_event *tmp_events; |
411 | struct lttng_ht_iter iter; | |
b4e3ceb9 PP |
412 | size_t extended_len = 0; |
413 | void *extended_at; | |
3c6a091f | 414 | |
022d91ba | 415 | assert(agt); |
3c6a091f DG |
416 | assert(events); |
417 | ||
022d91ba | 418 | DBG3("Listing agent events"); |
3c6a091f | 419 | |
e5bbf678 | 420 | rcu_read_lock(); |
022d91ba | 421 | nb_event = lttng_ht_get_count(agt->events); |
e5bbf678 | 422 | rcu_read_unlock(); |
3c6a091f DG |
423 | if (nb_event == 0) { |
424 | ret = nb_event; | |
b4e3ceb9 | 425 | *total_size = 0; |
3c6a091f DG |
426 | goto error; |
427 | } | |
428 | ||
b4e3ceb9 PP |
429 | /* Compute required extended infos size */ |
430 | extended_len = nb_event * sizeof(struct lttcomm_event_extended_header); | |
431 | ||
432 | /* | |
433 | * This is only valid because the commands which add events are | |
434 | * processed in the same thread as the listing. | |
435 | */ | |
436 | rcu_read_lock(); | |
437 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { | |
795d57ce PP |
438 | increment_extended_len(event->filter_expression, NULL, |
439 | &extended_len); | |
b4e3ceb9 PP |
440 | } |
441 | rcu_read_unlock(); | |
442 | ||
443 | *total_size = nb_event * sizeof(*tmp_events) + extended_len; | |
444 | tmp_events = zmalloc(*total_size); | |
3c6a091f | 445 | if (!tmp_events) { |
022d91ba | 446 | PERROR("zmalloc agent events session"); |
3c6a091f DG |
447 | ret = -LTTNG_ERR_FATAL; |
448 | goto error; | |
449 | } | |
450 | ||
b4e3ceb9 PP |
451 | extended_at = ((uint8_t *) tmp_events) + |
452 | nb_event * sizeof(struct lttng_event); | |
453 | ||
3c6a091f | 454 | rcu_read_lock(); |
022d91ba | 455 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
3c6a091f DG |
456 | strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name)); |
457 | tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0'; | |
458 | tmp_events[i].enabled = event->enabled; | |
2106efa0 | 459 | tmp_events[i].loglevel = event->loglevel_value; |
ff94328f | 460 | tmp_events[i].loglevel_type = event->loglevel_type; |
3c6a091f | 461 | i++; |
b4e3ceb9 PP |
462 | |
463 | /* Append extended info */ | |
795d57ce PP |
464 | append_extended_info(event->filter_expression, NULL, |
465 | &extended_at); | |
3c6a091f DG |
466 | } |
467 | rcu_read_unlock(); | |
468 | ||
469 | *events = tmp_events; | |
470 | ret = nb_event; | |
471 | ||
472 | error: | |
473 | assert(nb_event == i); | |
474 | return ret; | |
475 | } | |
476 | ||
2f77fc4b DG |
477 | /* |
478 | * Create a list of ust global domain events. | |
479 | */ | |
480 | static int list_lttng_ust_global_events(char *channel_name, | |
b4e3ceb9 PP |
481 | struct ltt_ust_domain_global *ust_global, |
482 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
483 | { |
484 | int i = 0, ret = 0; | |
485 | unsigned int nb_event = 0; | |
486 | struct lttng_ht_iter iter; | |
487 | struct lttng_ht_node_str *node; | |
488 | struct ltt_ust_channel *uchan; | |
489 | struct ltt_ust_event *uevent; | |
490 | struct lttng_event *tmp; | |
b4e3ceb9 PP |
491 | size_t extended_len = 0; |
492 | void *extended_at; | |
2f77fc4b DG |
493 | |
494 | DBG("Listing UST global events for channel %s", channel_name); | |
495 | ||
496 | rcu_read_lock(); | |
497 | ||
498 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); | |
499 | node = lttng_ht_iter_get_node_str(&iter); | |
500 | if (node == NULL) { | |
f73fabfd | 501 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
d31d3e8c | 502 | goto end; |
2f77fc4b DG |
503 | } |
504 | ||
505 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); | |
506 | ||
3c442be3 | 507 | nb_event = lttng_ht_get_count(uchan->events); |
2f77fc4b DG |
508 | if (nb_event == 0) { |
509 | ret = nb_event; | |
b4e3ceb9 | 510 | *total_size = 0; |
d31d3e8c | 511 | goto end; |
2f77fc4b DG |
512 | } |
513 | ||
514 | DBG3("Listing UST global %d events", nb_event); | |
515 | ||
b4e3ceb9 PP |
516 | /* Compute required extended infos size */ |
517 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { | |
518 | if (uevent->internal) { | |
519 | nb_event--; | |
520 | continue; | |
521 | } | |
522 | ||
523 | increment_extended_len(uevent->filter_expression, | |
795d57ce | 524 | uevent->exclusion, &extended_len); |
b4e3ceb9 | 525 | } |
d31d3e8c PP |
526 | if (nb_event == 0) { |
527 | /* All events are internal, skip. */ | |
528 | ret = 0; | |
529 | *total_size = 0; | |
530 | goto end; | |
531 | } | |
b4e3ceb9 PP |
532 | |
533 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
534 | tmp = zmalloc(*total_size); | |
2f77fc4b | 535 | if (tmp == NULL) { |
b12c38df JG |
536 | ret = -LTTNG_ERR_FATAL; |
537 | goto end; | |
2f77fc4b DG |
538 | } |
539 | ||
b4e3ceb9 PP |
540 | extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event); |
541 | ||
2f77fc4b | 542 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
3c442be3 JG |
543 | if (uevent->internal) { |
544 | /* This event should remain hidden from clients */ | |
3c442be3 JG |
545 | continue; |
546 | } | |
2f77fc4b DG |
547 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
548 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
549 | tmp[i].enabled = uevent->enabled; | |
550 | ||
551 | switch (uevent->attr.instrumentation) { | |
552 | case LTTNG_UST_TRACEPOINT: | |
553 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
554 | break; | |
555 | case LTTNG_UST_PROBE: | |
556 | tmp[i].type = LTTNG_EVENT_PROBE; | |
557 | break; | |
558 | case LTTNG_UST_FUNCTION: | |
559 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
560 | break; | |
561 | } | |
562 | ||
563 | tmp[i].loglevel = uevent->attr.loglevel; | |
564 | switch (uevent->attr.loglevel_type) { | |
565 | case LTTNG_UST_LOGLEVEL_ALL: | |
566 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
567 | break; | |
568 | case LTTNG_UST_LOGLEVEL_RANGE: | |
569 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; | |
570 | break; | |
571 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
572 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; | |
573 | break; | |
574 | } | |
575 | if (uevent->filter) { | |
576 | tmp[i].filter = 1; | |
577 | } | |
4634f12e JI |
578 | if (uevent->exclusion) { |
579 | tmp[i].exclusion = 1; | |
580 | } | |
2f77fc4b | 581 | i++; |
b4e3ceb9 PP |
582 | |
583 | /* Append extended info */ | |
795d57ce PP |
584 | append_extended_info(uevent->filter_expression, |
585 | uevent->exclusion, &extended_at); | |
2f77fc4b DG |
586 | } |
587 | ||
588 | ret = nb_event; | |
589 | *events = tmp; | |
d31d3e8c | 590 | end: |
2f77fc4b DG |
591 | rcu_read_unlock(); |
592 | return ret; | |
593 | } | |
594 | ||
595 | /* | |
596 | * Fill lttng_event array of all kernel events in the channel. | |
597 | */ | |
598 | static int list_lttng_kernel_events(char *channel_name, | |
b4e3ceb9 PP |
599 | struct ltt_kernel_session *kernel_session, |
600 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
601 | { |
602 | int i = 0, ret; | |
603 | unsigned int nb_event; | |
604 | struct ltt_kernel_event *event; | |
605 | struct ltt_kernel_channel *kchan; | |
b4e3ceb9 PP |
606 | size_t extended_len = 0; |
607 | void *extended_at; | |
2f77fc4b DG |
608 | |
609 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
610 | if (kchan == NULL) { | |
f73fabfd | 611 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
612 | goto error; |
613 | } | |
614 | ||
615 | nb_event = kchan->event_count; | |
616 | ||
617 | DBG("Listing events for channel %s", kchan->channel->name); | |
618 | ||
619 | if (nb_event == 0) { | |
b4e3ceb9 | 620 | *total_size = 0; |
834978fd | 621 | *events = NULL; |
db906c12 | 622 | goto end; |
2f77fc4b DG |
623 | } |
624 | ||
b4e3ceb9 PP |
625 | /* Compute required extended infos size */ |
626 | cds_list_for_each_entry(event, &kchan->events_list.head, list) { | |
795d57ce PP |
627 | increment_extended_len(event->filter_expression, NULL, |
628 | &extended_len); | |
b4e3ceb9 PP |
629 | } |
630 | ||
631 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
632 | *events = zmalloc(*total_size); | |
2f77fc4b | 633 | if (*events == NULL) { |
f73fabfd | 634 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
635 | goto error; |
636 | } | |
637 | ||
ab4aa612 | 638 | extended_at = ((void *) *events) + |
b4e3ceb9 PP |
639 | nb_event * sizeof(struct lttng_event); |
640 | ||
2f77fc4b DG |
641 | /* Kernel channels */ |
642 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
643 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
644 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
645 | (*events)[i].enabled = event->enabled; | |
00f992f2 JG |
646 | (*events)[i].filter = |
647 | (unsigned char) !!event->filter_expression; | |
2f77fc4b DG |
648 | |
649 | switch (event->event->instrumentation) { | |
650 | case LTTNG_KERNEL_TRACEPOINT: | |
651 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; | |
652 | break; | |
2f77fc4b | 653 | case LTTNG_KERNEL_KRETPROBE: |
1896972b DG |
654 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
655 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
656 | sizeof(struct lttng_kernel_kprobe)); | |
657 | break; | |
658 | case LTTNG_KERNEL_KPROBE: | |
2f77fc4b DG |
659 | (*events)[i].type = LTTNG_EVENT_PROBE; |
660 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
661 | sizeof(struct lttng_kernel_kprobe)); | |
662 | break; | |
663 | case LTTNG_KERNEL_FUNCTION: | |
664 | (*events)[i].type = LTTNG_EVENT_FUNCTION; | |
665 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
666 | sizeof(struct lttng_kernel_function)); | |
667 | break; | |
668 | case LTTNG_KERNEL_NOOP: | |
669 | (*events)[i].type = LTTNG_EVENT_NOOP; | |
670 | break; | |
671 | case LTTNG_KERNEL_SYSCALL: | |
672 | (*events)[i].type = LTTNG_EVENT_SYSCALL; | |
673 | break; | |
674 | case LTTNG_KERNEL_ALL: | |
675 | assert(0); | |
676 | break; | |
677 | } | |
678 | i++; | |
b4e3ceb9 PP |
679 | |
680 | /* Append extended info */ | |
795d57ce PP |
681 | append_extended_info(event->filter_expression, NULL, |
682 | &extended_at); | |
2f77fc4b DG |
683 | } |
684 | ||
db906c12 | 685 | end: |
2f77fc4b DG |
686 | return nb_event; |
687 | ||
688 | error: | |
f73fabfd DG |
689 | /* Negate the error code to differentiate the size from an error */ |
690 | return -ret; | |
2f77fc4b DG |
691 | } |
692 | ||
693 | /* | |
694 | * Add URI so the consumer output object. Set the correct path depending on the | |
695 | * domain adding the default trace directory. | |
696 | */ | |
697 | static int add_uri_to_consumer(struct consumer_output *consumer, | |
56a37563 JG |
698 | struct lttng_uri *uri, enum lttng_domain_type domain, |
699 | const char *session_name) | |
2f77fc4b | 700 | { |
f73fabfd | 701 | int ret = LTTNG_OK; |
2f77fc4b DG |
702 | const char *default_trace_dir; |
703 | ||
704 | assert(uri); | |
705 | ||
706 | if (consumer == NULL) { | |
707 | DBG("No consumer detected. Don't add URI. Stopping."); | |
f73fabfd | 708 | ret = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
709 | goto error; |
710 | } | |
711 | ||
712 | switch (domain) { | |
713 | case LTTNG_DOMAIN_KERNEL: | |
714 | default_trace_dir = DEFAULT_KERNEL_TRACE_DIR; | |
715 | break; | |
716 | case LTTNG_DOMAIN_UST: | |
717 | default_trace_dir = DEFAULT_UST_TRACE_DIR; | |
718 | break; | |
719 | default: | |
720 | /* | |
721 | * This case is possible is we try to add the URI to the global tracing | |
722 | * session consumer object which in this case there is no subdir. | |
723 | */ | |
724 | default_trace_dir = ""; | |
725 | } | |
726 | ||
727 | switch (uri->dtype) { | |
728 | case LTTNG_DST_IPV4: | |
729 | case LTTNG_DST_IPV6: | |
730 | DBG2("Setting network URI to consumer"); | |
731 | ||
df75acac DG |
732 | if (consumer->type == CONSUMER_DST_NET) { |
733 | if ((uri->stype == LTTNG_STREAM_CONTROL && | |
785d2d0d DG |
734 | consumer->dst.net.control_isset) || |
735 | (uri->stype == LTTNG_STREAM_DATA && | |
736 | consumer->dst.net.data_isset)) { | |
df75acac DG |
737 | ret = LTTNG_ERR_URL_EXIST; |
738 | goto error; | |
739 | } | |
740 | } else { | |
741 | memset(&consumer->dst.net, 0, sizeof(consumer->dst.net)); | |
785d2d0d DG |
742 | } |
743 | ||
df75acac DG |
744 | consumer->type = CONSUMER_DST_NET; |
745 | ||
2f77fc4b DG |
746 | /* Set URI into consumer output object */ |
747 | ret = consumer_set_network_uri(consumer, uri); | |
748 | if (ret < 0) { | |
a74934ba | 749 | ret = -ret; |
2f77fc4b DG |
750 | goto error; |
751 | } else if (ret == 1) { | |
752 | /* | |
753 | * URI was the same in the consumer so we do not append the subdir | |
754 | * again so to not duplicate output dir. | |
755 | */ | |
f86c9f4e | 756 | ret = LTTNG_OK; |
2f77fc4b DG |
757 | goto error; |
758 | } | |
759 | ||
760 | if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) { | |
761 | ret = consumer_set_subdir(consumer, session_name); | |
762 | if (ret < 0) { | |
f73fabfd | 763 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
764 | goto error; |
765 | } | |
766 | } | |
767 | ||
768 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
769 | /* On a new subdir, reappend the default trace dir. */ | |
c30ce0b3 CB |
770 | strncat(consumer->subdir, default_trace_dir, |
771 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
772 | DBG3("Append domain trace name to subdir %s", consumer->subdir); |
773 | } | |
774 | ||
775 | break; | |
776 | case LTTNG_DST_PATH: | |
777 | DBG2("Setting trace directory path from URI to %s", uri->dst.path); | |
778 | memset(consumer->dst.trace_path, 0, | |
779 | sizeof(consumer->dst.trace_path)); | |
9ac05d92 MD |
780 | /* Explicit length checks for strcpy and strcat. */ |
781 | if (strlen(uri->dst.path) + strlen(default_trace_dir) | |
782 | >= sizeof(consumer->dst.trace_path)) { | |
783 | ret = LTTNG_ERR_FATAL; | |
784 | goto error; | |
785 | } | |
786 | strcpy(consumer->dst.trace_path, uri->dst.path); | |
2f77fc4b | 787 | /* Append default trace dir */ |
9ac05d92 | 788 | strcat(consumer->dst.trace_path, default_trace_dir); |
2f77fc4b DG |
789 | /* Flag consumer as local. */ |
790 | consumer->type = CONSUMER_DST_LOCAL; | |
791 | break; | |
792 | } | |
793 | ||
a74934ba DG |
794 | ret = LTTNG_OK; |
795 | ||
2f77fc4b DG |
796 | error: |
797 | return ret; | |
798 | } | |
799 | ||
800 | /* | |
801 | * Init tracing by creating trace directory and sending fds kernel consumer. | |
802 | */ | |
803 | static int init_kernel_tracing(struct ltt_kernel_session *session) | |
804 | { | |
805 | int ret = 0; | |
806 | struct lttng_ht_iter iter; | |
807 | struct consumer_socket *socket; | |
808 | ||
809 | assert(session); | |
810 | ||
e7fe706f DG |
811 | rcu_read_lock(); |
812 | ||
2f77fc4b DG |
813 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { |
814 | cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter, | |
815 | socket, node.node) { | |
2f77fc4b | 816 | pthread_mutex_lock(socket->lock); |
f50f23d9 | 817 | ret = kernel_consumer_send_session(socket, session); |
2f77fc4b DG |
818 | pthread_mutex_unlock(socket->lock); |
819 | if (ret < 0) { | |
f73fabfd | 820 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
821 | goto error; |
822 | } | |
823 | } | |
824 | } | |
825 | ||
826 | error: | |
e7fe706f | 827 | rcu_read_unlock(); |
2f77fc4b DG |
828 | return ret; |
829 | } | |
830 | ||
831 | /* | |
832 | * Create a socket to the relayd using the URI. | |
833 | * | |
834 | * On success, the relayd_sock pointer is set to the created socket. | |
835 | * Else, it's stays untouched and a lttcomm error code is returned. | |
836 | */ | |
6151a90f | 837 | static int create_connect_relayd(struct lttng_uri *uri, |
b31610f2 JD |
838 | struct lttcomm_relayd_sock **relayd_sock, |
839 | struct consumer_output *consumer) | |
2f77fc4b DG |
840 | { |
841 | int ret; | |
6151a90f | 842 | struct lttcomm_relayd_sock *rsock; |
2f77fc4b | 843 | |
6151a90f JD |
844 | rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR, |
845 | RELAYD_VERSION_COMM_MINOR); | |
846 | if (!rsock) { | |
f73fabfd | 847 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
848 | goto error; |
849 | } | |
850 | ||
ffe60014 DG |
851 | /* |
852 | * Connect to relayd so we can proceed with a session creation. This call | |
853 | * can possibly block for an arbitrary amount of time to set the health | |
854 | * state to be in poll execution. | |
855 | */ | |
856 | health_poll_entry(); | |
6151a90f | 857 | ret = relayd_connect(rsock); |
ffe60014 | 858 | health_poll_exit(); |
2f77fc4b DG |
859 | if (ret < 0) { |
860 | ERR("Unable to reach lttng-relayd"); | |
f73fabfd | 861 | ret = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
862 | goto free_sock; |
863 | } | |
864 | ||
865 | /* Create socket for control stream. */ | |
866 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
867 | DBG3("Creating relayd stream socket from URI"); | |
868 | ||
869 | /* Check relayd version */ | |
6151a90f | 870 | ret = relayd_version_check(rsock); |
2f77fc4b | 871 | if (ret < 0) { |
f73fabfd | 872 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; |
2f77fc4b DG |
873 | goto close_sock; |
874 | } | |
b31610f2 JD |
875 | consumer->relay_major_version = rsock->major; |
876 | consumer->relay_minor_version = rsock->minor; | |
2f77fc4b DG |
877 | } else if (uri->stype == LTTNG_STREAM_DATA) { |
878 | DBG3("Creating relayd data socket from URI"); | |
879 | } else { | |
880 | /* Command is not valid */ | |
881 | ERR("Relayd invalid stream type: %d", uri->stype); | |
f73fabfd | 882 | ret = LTTNG_ERR_INVALID; |
2f77fc4b DG |
883 | goto close_sock; |
884 | } | |
885 | ||
6151a90f | 886 | *relayd_sock = rsock; |
2f77fc4b | 887 | |
f73fabfd | 888 | return LTTNG_OK; |
2f77fc4b DG |
889 | |
890 | close_sock: | |
6151a90f JD |
891 | /* The returned value is not useful since we are on an error path. */ |
892 | (void) relayd_close(rsock); | |
2f77fc4b | 893 | free_sock: |
6151a90f | 894 | free(rsock); |
2f77fc4b DG |
895 | error: |
896 | return ret; | |
897 | } | |
898 | ||
899 | /* | |
900 | * Connect to the relayd using URI and send the socket to the right consumer. | |
901 | */ | |
56a37563 JG |
902 | static int send_consumer_relayd_socket(enum lttng_domain_type domain, |
903 | unsigned int session_id, struct lttng_uri *relayd_uri, | |
904 | struct consumer_output *consumer, | |
d3e2ba59 JD |
905 | struct consumer_socket *consumer_sock, |
906 | char *session_name, char *hostname, int session_live_timer) | |
2f77fc4b DG |
907 | { |
908 | int ret; | |
6151a90f | 909 | struct lttcomm_relayd_sock *rsock = NULL; |
2f77fc4b | 910 | |
ffe60014 | 911 | /* Connect to relayd and make version check if uri is the control. */ |
b31610f2 | 912 | ret = create_connect_relayd(relayd_uri, &rsock, consumer); |
ffe60014 | 913 | if (ret != LTTNG_OK) { |
6151a90f | 914 | goto error; |
ffe60014 | 915 | } |
6151a90f | 916 | assert(rsock); |
ffe60014 | 917 | |
2f77fc4b | 918 | /* Set the network sequence index if not set. */ |
d88aee68 DG |
919 | if (consumer->net_seq_index == (uint64_t) -1ULL) { |
920 | pthread_mutex_lock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
921 | /* |
922 | * Increment net_seq_idx because we are about to transfer the | |
923 | * new relayd socket to the consumer. | |
d88aee68 | 924 | * Assign unique key so the consumer can match streams. |
2f77fc4b | 925 | */ |
d88aee68 DG |
926 | consumer->net_seq_index = ++relayd_net_seq_idx; |
927 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
928 | } |
929 | ||
2f77fc4b | 930 | /* Send relayd socket to consumer. */ |
6151a90f | 931 | ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer, |
d3e2ba59 JD |
932 | relayd_uri->stype, session_id, |
933 | session_name, hostname, session_live_timer); | |
2f77fc4b | 934 | if (ret < 0) { |
f73fabfd | 935 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
936 | goto close_sock; |
937 | } | |
938 | ||
c890b720 DG |
939 | /* Flag that the corresponding socket was sent. */ |
940 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
ffe60014 | 941 | consumer_sock->control_sock_sent = 1; |
c890b720 | 942 | } else if (relayd_uri->stype == LTTNG_STREAM_DATA) { |
ffe60014 | 943 | consumer_sock->data_sock_sent = 1; |
c890b720 DG |
944 | } |
945 | ||
f73fabfd | 946 | ret = LTTNG_OK; |
2f77fc4b DG |
947 | |
948 | /* | |
949 | * Close socket which was dup on the consumer side. The session daemon does | |
950 | * NOT keep track of the relayd socket(s) once transfer to the consumer. | |
951 | */ | |
952 | ||
953 | close_sock: | |
6151a90f JD |
954 | (void) relayd_close(rsock); |
955 | free(rsock); | |
2f77fc4b | 956 | |
6151a90f | 957 | error: |
ffe60014 DG |
958 | if (ret != LTTNG_OK) { |
959 | /* | |
d9078d0c DG |
960 | * The consumer output for this session should not be used anymore |
961 | * since the relayd connection failed thus making any tracing or/and | |
962 | * streaming not usable. | |
ffe60014 | 963 | */ |
d9078d0c | 964 | consumer->enabled = 0; |
ffe60014 | 965 | } |
2f77fc4b DG |
966 | return ret; |
967 | } | |
968 | ||
969 | /* | |
970 | * Send both relayd sockets to a specific consumer and domain. This is a | |
971 | * helper function to facilitate sending the information to the consumer for a | |
972 | * session. | |
973 | */ | |
56a37563 JG |
974 | static int send_consumer_relayd_sockets(enum lttng_domain_type domain, |
975 | unsigned int session_id, struct consumer_output *consumer, | |
976 | struct consumer_socket *sock, char *session_name, | |
977 | char *hostname, int session_live_timer) | |
2f77fc4b | 978 | { |
dda67f6c | 979 | int ret = LTTNG_OK; |
2f77fc4b | 980 | |
2f77fc4b | 981 | assert(consumer); |
6dc3064a | 982 | assert(sock); |
2f77fc4b | 983 | |
2f77fc4b | 984 | /* Sending control relayd socket. */ |
ffe60014 | 985 | if (!sock->control_sock_sent) { |
6dc3064a | 986 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
987 | &consumer->dst.net.control, consumer, sock, |
988 | session_name, hostname, session_live_timer); | |
c890b720 DG |
989 | if (ret != LTTNG_OK) { |
990 | goto error; | |
991 | } | |
2f77fc4b DG |
992 | } |
993 | ||
994 | /* Sending data relayd socket. */ | |
ffe60014 | 995 | if (!sock->data_sock_sent) { |
6dc3064a | 996 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
997 | &consumer->dst.net.data, consumer, sock, |
998 | session_name, hostname, session_live_timer); | |
c890b720 DG |
999 | if (ret != LTTNG_OK) { |
1000 | goto error; | |
1001 | } | |
2f77fc4b DG |
1002 | } |
1003 | ||
2f77fc4b DG |
1004 | error: |
1005 | return ret; | |
1006 | } | |
1007 | ||
1008 | /* | |
1009 | * Setup relayd connections for a tracing session. First creates the socket to | |
1010 | * the relayd and send them to the right domain consumer. Consumer type MUST be | |
1011 | * network. | |
1012 | */ | |
ffe60014 | 1013 | int cmd_setup_relayd(struct ltt_session *session) |
2f77fc4b | 1014 | { |
f73fabfd | 1015 | int ret = LTTNG_OK; |
2f77fc4b DG |
1016 | struct ltt_ust_session *usess; |
1017 | struct ltt_kernel_session *ksess; | |
1018 | struct consumer_socket *socket; | |
1019 | struct lttng_ht_iter iter; | |
1020 | ||
1021 | assert(session); | |
1022 | ||
1023 | usess = session->ust_session; | |
1024 | ksess = session->kernel_session; | |
1025 | ||
785d2d0d | 1026 | DBG("Setting relayd for session %s", session->name); |
2f77fc4b | 1027 | |
e7fe706f DG |
1028 | rcu_read_lock(); |
1029 | ||
2f77fc4b DG |
1030 | if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET |
1031 | && usess->consumer->enabled) { | |
1032 | /* For each consumer socket, send relayd sockets */ | |
1033 | cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, | |
1034 | socket, node.node) { | |
2f77fc4b | 1035 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1036 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id, |
d3e2ba59 JD |
1037 | usess->consumer, socket, |
1038 | session->name, session->hostname, | |
1039 | session->live_timer); | |
2f77fc4b | 1040 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1041 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1042 | goto error; |
1043 | } | |
6dc3064a DG |
1044 | /* Session is now ready for network streaming. */ |
1045 | session->net_handle = 1; | |
2f77fc4b | 1046 | } |
b31610f2 JD |
1047 | session->consumer->relay_major_version = |
1048 | usess->consumer->relay_major_version; | |
1049 | session->consumer->relay_minor_version = | |
1050 | usess->consumer->relay_minor_version; | |
2f77fc4b DG |
1051 | } |
1052 | ||
1053 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET | |
1054 | && ksess->consumer->enabled) { | |
1055 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1056 | socket, node.node) { | |
2f77fc4b | 1057 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1058 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id, |
d3e2ba59 JD |
1059 | ksess->consumer, socket, |
1060 | session->name, session->hostname, | |
1061 | session->live_timer); | |
2f77fc4b | 1062 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1063 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1064 | goto error; |
1065 | } | |
6dc3064a DG |
1066 | /* Session is now ready for network streaming. */ |
1067 | session->net_handle = 1; | |
2f77fc4b | 1068 | } |
b31610f2 JD |
1069 | session->consumer->relay_major_version = |
1070 | ksess->consumer->relay_major_version; | |
1071 | session->consumer->relay_minor_version = | |
1072 | ksess->consumer->relay_minor_version; | |
2f77fc4b DG |
1073 | } |
1074 | ||
1075 | error: | |
e7fe706f | 1076 | rcu_read_unlock(); |
2f77fc4b DG |
1077 | return ret; |
1078 | } | |
1079 | ||
9b6c7ec5 DG |
1080 | /* |
1081 | * Start a kernel session by opening all necessary streams. | |
1082 | */ | |
1083 | static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe) | |
1084 | { | |
1085 | int ret; | |
1086 | struct ltt_kernel_channel *kchan; | |
1087 | ||
1088 | /* Open kernel metadata */ | |
07b86b52 | 1089 | if (ksess->metadata == NULL && ksess->output_traces) { |
9b6c7ec5 DG |
1090 | ret = kernel_open_metadata(ksess); |
1091 | if (ret < 0) { | |
1092 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1093 | goto error; | |
1094 | } | |
1095 | } | |
1096 | ||
1097 | /* Open kernel metadata stream */ | |
07b86b52 | 1098 | if (ksess->metadata && ksess->metadata_stream_fd < 0) { |
9b6c7ec5 DG |
1099 | ret = kernel_open_metadata_stream(ksess); |
1100 | if (ret < 0) { | |
1101 | ERR("Kernel create metadata stream failed"); | |
1102 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1103 | goto error; | |
1104 | } | |
1105 | } | |
1106 | ||
1107 | /* For each channel */ | |
1108 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
1109 | if (kchan->stream_count == 0) { | |
1110 | ret = kernel_open_channel_stream(kchan); | |
1111 | if (ret < 0) { | |
1112 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1113 | goto error; | |
1114 | } | |
1115 | /* Update the stream global counter */ | |
1116 | ksess->stream_count_global += ret; | |
1117 | } | |
1118 | } | |
1119 | ||
1120 | /* Setup kernel consumer socket and send fds to it */ | |
1121 | ret = init_kernel_tracing(ksess); | |
e43c41c5 | 1122 | if (ret != 0) { |
9b6c7ec5 DG |
1123 | ret = LTTNG_ERR_KERN_START_FAIL; |
1124 | goto error; | |
1125 | } | |
1126 | ||
1127 | /* This start the kernel tracing */ | |
1128 | ret = kernel_start_session(ksess); | |
1129 | if (ret < 0) { | |
1130 | ret = LTTNG_ERR_KERN_START_FAIL; | |
1131 | goto error; | |
1132 | } | |
1133 | ||
1134 | /* Quiescent wait after starting trace */ | |
784303b0 | 1135 | kernel_wait_quiescent(kernel_tracer_fd); |
9b6c7ec5 | 1136 | |
14fb1ebe | 1137 | ksess->active = 1; |
9b6c7ec5 DG |
1138 | |
1139 | ret = LTTNG_OK; | |
1140 | ||
1141 | error: | |
1142 | return ret; | |
1143 | } | |
1144 | ||
2f77fc4b DG |
1145 | /* |
1146 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. | |
1147 | */ | |
56a37563 JG |
1148 | int cmd_disable_channel(struct ltt_session *session, |
1149 | enum lttng_domain_type domain, char *channel_name) | |
2f77fc4b DG |
1150 | { |
1151 | int ret; | |
1152 | struct ltt_ust_session *usess; | |
1153 | ||
1154 | usess = session->ust_session; | |
1155 | ||
2223c96f DG |
1156 | rcu_read_lock(); |
1157 | ||
2f77fc4b DG |
1158 | switch (domain) { |
1159 | case LTTNG_DOMAIN_KERNEL: | |
1160 | { | |
1161 | ret = channel_kernel_disable(session->kernel_session, | |
1162 | channel_name); | |
f73fabfd | 1163 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1164 | goto error; |
1165 | } | |
1166 | ||
1167 | kernel_wait_quiescent(kernel_tracer_fd); | |
1168 | break; | |
1169 | } | |
1170 | case LTTNG_DOMAIN_UST: | |
1171 | { | |
1172 | struct ltt_ust_channel *uchan; | |
1173 | struct lttng_ht *chan_ht; | |
1174 | ||
1175 | chan_ht = usess->domain_global.channels; | |
1176 | ||
1177 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
1178 | if (uchan == NULL) { | |
f73fabfd | 1179 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
1180 | goto error; |
1181 | } | |
1182 | ||
7972aab2 | 1183 | ret = channel_ust_disable(usess, uchan); |
f73fabfd | 1184 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1185 | goto error; |
1186 | } | |
1187 | break; | |
1188 | } | |
2f77fc4b | 1189 | default: |
f73fabfd | 1190 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1191 | goto error; |
1192 | } | |
1193 | ||
f73fabfd | 1194 | ret = LTTNG_OK; |
2f77fc4b DG |
1195 | |
1196 | error: | |
2223c96f | 1197 | rcu_read_unlock(); |
2f77fc4b DG |
1198 | return ret; |
1199 | } | |
1200 | ||
ccf10263 MD |
1201 | /* |
1202 | * Command LTTNG_TRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1203 | * |
1204 | * Called with session lock held. | |
ccf10263 | 1205 | */ |
56a37563 JG |
1206 | int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1207 | int pid) | |
ccf10263 MD |
1208 | { |
1209 | int ret; | |
1210 | ||
1211 | rcu_read_lock(); | |
1212 | ||
1213 | switch (domain) { | |
1214 | case LTTNG_DOMAIN_KERNEL: | |
1215 | { | |
1216 | struct ltt_kernel_session *ksess; | |
1217 | ||
1218 | ksess = session->kernel_session; | |
1219 | ||
1220 | ret = kernel_track_pid(ksess, pid); | |
1221 | if (ret != LTTNG_OK) { | |
1222 | goto error; | |
1223 | } | |
1224 | ||
1225 | kernel_wait_quiescent(kernel_tracer_fd); | |
1226 | break; | |
1227 | } | |
ccf10263 | 1228 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1229 | { |
1230 | struct ltt_ust_session *usess; | |
1231 | ||
1232 | usess = session->ust_session; | |
1233 | ||
1234 | ret = trace_ust_track_pid(usess, pid); | |
1235 | if (ret != LTTNG_OK) { | |
1236 | goto error; | |
1237 | } | |
1238 | break; | |
1239 | } | |
ccf10263 MD |
1240 | default: |
1241 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1242 | goto error; | |
1243 | } | |
1244 | ||
1245 | ret = LTTNG_OK; | |
1246 | ||
1247 | error: | |
1248 | rcu_read_unlock(); | |
1249 | return ret; | |
1250 | } | |
1251 | ||
1252 | /* | |
1253 | * Command LTTNG_UNTRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1254 | * |
1255 | * Called with session lock held. | |
ccf10263 | 1256 | */ |
56a37563 JG |
1257 | int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1258 | int pid) | |
ccf10263 MD |
1259 | { |
1260 | int ret; | |
1261 | ||
1262 | rcu_read_lock(); | |
1263 | ||
1264 | switch (domain) { | |
1265 | case LTTNG_DOMAIN_KERNEL: | |
1266 | { | |
1267 | struct ltt_kernel_session *ksess; | |
1268 | ||
1269 | ksess = session->kernel_session; | |
1270 | ||
1271 | ret = kernel_untrack_pid(ksess, pid); | |
1272 | if (ret != LTTNG_OK) { | |
1273 | goto error; | |
1274 | } | |
1275 | ||
1276 | kernel_wait_quiescent(kernel_tracer_fd); | |
1277 | break; | |
1278 | } | |
ccf10263 | 1279 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1280 | { |
1281 | struct ltt_ust_session *usess; | |
1282 | ||
1283 | usess = session->ust_session; | |
1284 | ||
1285 | ret = trace_ust_untrack_pid(usess, pid); | |
1286 | if (ret != LTTNG_OK) { | |
1287 | goto error; | |
1288 | } | |
1289 | break; | |
1290 | } | |
ccf10263 MD |
1291 | default: |
1292 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1293 | goto error; | |
1294 | } | |
1295 | ||
1296 | ret = LTTNG_OK; | |
1297 | ||
1298 | error: | |
1299 | rcu_read_unlock(); | |
1300 | return ret; | |
1301 | } | |
1302 | ||
2f77fc4b DG |
1303 | /* |
1304 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
1305 | * | |
1306 | * The wpipe arguments is used as a notifier for the kernel thread. | |
1307 | */ | |
1308 | int cmd_enable_channel(struct ltt_session *session, | |
7972aab2 | 1309 | struct lttng_domain *domain, struct lttng_channel *attr, int wpipe) |
2f77fc4b DG |
1310 | { |
1311 | int ret; | |
1312 | struct ltt_ust_session *usess = session->ust_session; | |
1313 | struct lttng_ht *chan_ht; | |
1f345e94 | 1314 | size_t len; |
2f77fc4b DG |
1315 | |
1316 | assert(session); | |
1317 | assert(attr); | |
7972aab2 | 1318 | assert(domain); |
2f77fc4b | 1319 | |
f5436bfc | 1320 | len = lttng_strnlen(attr->name, sizeof(attr->name)); |
1f345e94 PP |
1321 | |
1322 | /* Validate channel name */ | |
1323 | if (attr->name[0] == '.' || | |
1324 | memchr(attr->name, '/', len) != NULL) { | |
1325 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1326 | goto end; | |
1327 | } | |
1328 | ||
2f77fc4b DG |
1329 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
1330 | ||
03b4fdcf DG |
1331 | rcu_read_lock(); |
1332 | ||
ecc48a90 JD |
1333 | /* |
1334 | * Don't try to enable a channel if the session has been started at | |
1335 | * some point in time before. The tracer does not allow it. | |
1336 | */ | |
8382cf6f | 1337 | if (session->has_been_started) { |
ecc48a90 JD |
1338 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
1339 | goto error; | |
1340 | } | |
1341 | ||
1342 | /* | |
1343 | * If the session is a live session, remove the switch timer, the | |
1344 | * live timer does the same thing but sends also synchronisation | |
1345 | * beacons for inactive streams. | |
1346 | */ | |
1347 | if (session->live_timer > 0) { | |
1348 | attr->attr.live_timer_interval = session->live_timer; | |
1349 | attr->attr.switch_timer_interval = 0; | |
1350 | } | |
1351 | ||
7972aab2 | 1352 | switch (domain->type) { |
2f77fc4b DG |
1353 | case LTTNG_DOMAIN_KERNEL: |
1354 | { | |
1355 | struct ltt_kernel_channel *kchan; | |
1356 | ||
2f77fc4b DG |
1357 | kchan = trace_kernel_get_channel_by_name(attr->name, |
1358 | session->kernel_session); | |
1359 | if (kchan == NULL) { | |
1360 | ret = channel_kernel_create(session->kernel_session, attr, wpipe); | |
85076754 MD |
1361 | if (attr->name[0] != '\0') { |
1362 | session->kernel_session->has_non_default_channel = 1; | |
1363 | } | |
2f77fc4b DG |
1364 | } else { |
1365 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
1366 | } | |
1367 | ||
f73fabfd | 1368 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1369 | goto error; |
1370 | } | |
1371 | ||
784303b0 | 1372 | kernel_wait_quiescent(kernel_tracer_fd); |
2f77fc4b DG |
1373 | break; |
1374 | } | |
1375 | case LTTNG_DOMAIN_UST: | |
9232818f JG |
1376 | case LTTNG_DOMAIN_JUL: |
1377 | case LTTNG_DOMAIN_LOG4J: | |
1378 | case LTTNG_DOMAIN_PYTHON: | |
2f77fc4b DG |
1379 | { |
1380 | struct ltt_ust_channel *uchan; | |
1381 | ||
9232818f JG |
1382 | /* |
1383 | * FIXME | |
1384 | * | |
1385 | * Current agent implementation limitations force us to allow | |
1386 | * only one channel at once in "agent" subdomains. Each | |
1387 | * subdomain has a default channel name which must be strictly | |
1388 | * adhered to. | |
1389 | */ | |
1390 | if (domain->type == LTTNG_DOMAIN_JUL) { | |
1391 | if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME, | |
1392 | LTTNG_SYMBOL_NAME_LEN)) { | |
1393 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1394 | goto error; | |
1395 | } | |
1396 | } else if (domain->type == LTTNG_DOMAIN_LOG4J) { | |
1397 | if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME, | |
1398 | LTTNG_SYMBOL_NAME_LEN)) { | |
1399 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1400 | goto error; | |
1401 | } | |
1402 | } else if (domain->type == LTTNG_DOMAIN_PYTHON) { | |
1403 | if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME, | |
1404 | LTTNG_SYMBOL_NAME_LEN)) { | |
1405 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1406 | goto error; | |
1407 | } | |
1408 | } | |
1409 | ||
2f77fc4b DG |
1410 | chan_ht = usess->domain_global.channels; |
1411 | ||
1412 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); | |
1413 | if (uchan == NULL) { | |
7972aab2 | 1414 | ret = channel_ust_create(usess, attr, domain->buf_type); |
85076754 MD |
1415 | if (attr->name[0] != '\0') { |
1416 | usess->has_non_default_channel = 1; | |
1417 | } | |
2f77fc4b | 1418 | } else { |
7972aab2 | 1419 | ret = channel_ust_enable(usess, uchan); |
2f77fc4b DG |
1420 | } |
1421 | break; | |
1422 | } | |
2f77fc4b | 1423 | default: |
f73fabfd | 1424 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1425 | goto error; |
1426 | } | |
1427 | ||
1428 | error: | |
2223c96f | 1429 | rcu_read_unlock(); |
1f345e94 | 1430 | end: |
2f77fc4b DG |
1431 | return ret; |
1432 | } | |
1433 | ||
2f77fc4b DG |
1434 | /* |
1435 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1436 | */ | |
56a37563 JG |
1437 | int cmd_disable_event(struct ltt_session *session, |
1438 | enum lttng_domain_type domain, char *channel_name, | |
6e911cad | 1439 | struct lttng_event *event) |
2f77fc4b DG |
1440 | { |
1441 | int ret; | |
6e911cad MD |
1442 | char *event_name; |
1443 | ||
18a720cd MD |
1444 | DBG("Disable event command for event \'%s\'", event->name); |
1445 | ||
6e911cad MD |
1446 | event_name = event->name; |
1447 | ||
9b7431cf JG |
1448 | /* Error out on unhandled search criteria */ |
1449 | if (event->loglevel_type || event->loglevel != -1 || event->enabled | |
6e911cad | 1450 | || event->pid || event->filter || event->exclusion) { |
7076b56e JG |
1451 | ret = LTTNG_ERR_UNK; |
1452 | goto error; | |
6e911cad | 1453 | } |
2f77fc4b | 1454 | |
2223c96f DG |
1455 | rcu_read_lock(); |
1456 | ||
2f77fc4b DG |
1457 | switch (domain) { |
1458 | case LTTNG_DOMAIN_KERNEL: | |
1459 | { | |
1460 | struct ltt_kernel_channel *kchan; | |
1461 | struct ltt_kernel_session *ksess; | |
1462 | ||
1463 | ksess = session->kernel_session; | |
1464 | ||
85076754 MD |
1465 | /* |
1466 | * If a non-default channel has been created in the | |
1467 | * session, explicitely require that -c chan_name needs | |
1468 | * to be provided. | |
1469 | */ | |
1470 | if (ksess->has_non_default_channel && channel_name[0] == '\0') { | |
1471 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1472 | goto error_unlock; |
85076754 MD |
1473 | } |
1474 | ||
2f77fc4b DG |
1475 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
1476 | if (kchan == NULL) { | |
f73fabfd | 1477 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
7076b56e | 1478 | goto error_unlock; |
2f77fc4b DG |
1479 | } |
1480 | ||
6e911cad MD |
1481 | switch (event->type) { |
1482 | case LTTNG_EVENT_ALL: | |
9550ee81 | 1483 | case LTTNG_EVENT_TRACEPOINT: |
d0ae4ea8 | 1484 | case LTTNG_EVENT_SYSCALL: |
9550ee81 JR |
1485 | case LTTNG_EVENT_PROBE: |
1486 | case LTTNG_EVENT_FUNCTION: | |
1487 | case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */ | |
1488 | if (event_name[0] == '\0') { | |
1489 | ret = event_kernel_disable_event(kchan, | |
1490 | NULL, event->type); | |
29c62722 | 1491 | } else { |
d0ae4ea8 | 1492 | ret = event_kernel_disable_event(kchan, |
9550ee81 | 1493 | event_name, event->type); |
29c62722 | 1494 | } |
6e911cad | 1495 | if (ret != LTTNG_OK) { |
7076b56e | 1496 | goto error_unlock; |
6e911cad MD |
1497 | } |
1498 | break; | |
6e911cad MD |
1499 | default: |
1500 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1501 | goto error_unlock; |
2f77fc4b DG |
1502 | } |
1503 | ||
1504 | kernel_wait_quiescent(kernel_tracer_fd); | |
1505 | break; | |
1506 | } | |
1507 | case LTTNG_DOMAIN_UST: | |
1508 | { | |
1509 | struct ltt_ust_channel *uchan; | |
1510 | struct ltt_ust_session *usess; | |
1511 | ||
1512 | usess = session->ust_session; | |
1513 | ||
7076b56e JG |
1514 | if (validate_ust_event_name(event_name)) { |
1515 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1516 | goto error_unlock; | |
1517 | } | |
1518 | ||
85076754 MD |
1519 | /* |
1520 | * If a non-default channel has been created in the | |
9550ee81 | 1521 | * session, explicitly require that -c chan_name needs |
85076754 MD |
1522 | * to be provided. |
1523 | */ | |
1524 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1525 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1526 | goto error_unlock; |
85076754 MD |
1527 | } |
1528 | ||
2f77fc4b DG |
1529 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
1530 | channel_name); | |
1531 | if (uchan == NULL) { | |
f73fabfd | 1532 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
7076b56e | 1533 | goto error_unlock; |
2f77fc4b DG |
1534 | } |
1535 | ||
6e911cad MD |
1536 | switch (event->type) { |
1537 | case LTTNG_EVENT_ALL: | |
b3639870 JR |
1538 | /* |
1539 | * An empty event name means that everything | |
1540 | * should be disabled. | |
1541 | */ | |
1542 | if (event->name[0] == '\0') { | |
1543 | ret = event_ust_disable_all_tracepoints(usess, uchan); | |
77d536b2 JR |
1544 | } else { |
1545 | ret = event_ust_disable_tracepoint(usess, uchan, | |
1546 | event_name); | |
1547 | } | |
6e911cad | 1548 | if (ret != LTTNG_OK) { |
7076b56e | 1549 | goto error_unlock; |
6e911cad MD |
1550 | } |
1551 | break; | |
1552 | default: | |
1553 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1554 | goto error_unlock; |
2f77fc4b DG |
1555 | } |
1556 | ||
1557 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
1558 | channel_name); | |
1559 | break; | |
1560 | } | |
5cdb6027 | 1561 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1562 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1563 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1564 | { |
fefd409b | 1565 | struct agent *agt; |
f20baf8e DG |
1566 | struct ltt_ust_session *usess = session->ust_session; |
1567 | ||
1568 | assert(usess); | |
1569 | ||
6e911cad MD |
1570 | switch (event->type) { |
1571 | case LTTNG_EVENT_ALL: | |
1572 | break; | |
1573 | default: | |
1574 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1575 | goto error_unlock; |
6e911cad MD |
1576 | } |
1577 | ||
5cdb6027 | 1578 | agt = trace_ust_find_agent(usess, domain); |
fefd409b DG |
1579 | if (!agt) { |
1580 | ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
7076b56e | 1581 | goto error_unlock; |
fefd409b | 1582 | } |
b3639870 JR |
1583 | /* |
1584 | * An empty event name means that everything | |
1585 | * should be disabled. | |
1586 | */ | |
1587 | if (event->name[0] == '\0') { | |
18a720cd MD |
1588 | ret = event_agent_disable_all(usess, agt); |
1589 | } else { | |
1590 | ret = event_agent_disable(usess, agt, event_name); | |
1591 | } | |
f20baf8e | 1592 | if (ret != LTTNG_OK) { |
7076b56e | 1593 | goto error_unlock; |
f20baf8e DG |
1594 | } |
1595 | ||
1596 | break; | |
1597 | } | |
2f77fc4b | 1598 | default: |
f73fabfd | 1599 | ret = LTTNG_ERR_UND; |
7076b56e | 1600 | goto error_unlock; |
2f77fc4b DG |
1601 | } |
1602 | ||
f73fabfd | 1603 | ret = LTTNG_OK; |
2f77fc4b | 1604 | |
7076b56e | 1605 | error_unlock: |
2223c96f | 1606 | rcu_read_unlock(); |
7076b56e | 1607 | error: |
2f77fc4b DG |
1608 | return ret; |
1609 | } | |
1610 | ||
2f77fc4b DG |
1611 | /* |
1612 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1613 | */ | |
56a37563 | 1614 | int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain, |
601d5acf | 1615 | char *channel_name, struct lttng_event_context *ctx, int kwpipe) |
2f77fc4b | 1616 | { |
d5979e4a | 1617 | int ret, chan_kern_created = 0, chan_ust_created = 0; |
bdf64013 JG |
1618 | char *app_ctx_provider_name = NULL, *app_ctx_name = NULL; |
1619 | ||
1620 | if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
1621 | app_ctx_provider_name = ctx->u.app_ctx.provider_name; | |
1622 | app_ctx_name = ctx->u.app_ctx.ctx_name; | |
1623 | } | |
2f77fc4b DG |
1624 | |
1625 | switch (domain) { | |
1626 | case LTTNG_DOMAIN_KERNEL: | |
979e618e DG |
1627 | assert(session->kernel_session); |
1628 | ||
1629 | if (session->kernel_session->channel_count == 0) { | |
1630 | /* Create default channel */ | |
1631 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); | |
1632 | if (ret != LTTNG_OK) { | |
1633 | goto error; | |
1634 | } | |
d5979e4a | 1635 | chan_kern_created = 1; |
979e618e | 1636 | } |
2f77fc4b | 1637 | /* Add kernel context to kernel tracer */ |
601d5acf | 1638 | ret = context_kernel_add(session->kernel_session, ctx, channel_name); |
f73fabfd | 1639 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1640 | goto error; |
1641 | } | |
1642 | break; | |
bdf64013 JG |
1643 | case LTTNG_DOMAIN_JUL: |
1644 | case LTTNG_DOMAIN_LOG4J: | |
1645 | { | |
1646 | /* | |
1647 | * Validate channel name. | |
1648 | * If no channel name is given and the domain is JUL or LOG4J, | |
1649 | * set it to the appropriate domain-specific channel name. If | |
1650 | * a name is provided but does not match the expexted channel | |
1651 | * name, return an error. | |
1652 | */ | |
1653 | if (domain == LTTNG_DOMAIN_JUL && *channel_name && | |
1654 | strcmp(channel_name, | |
1655 | DEFAULT_JUL_CHANNEL_NAME)) { | |
1656 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1657 | goto error; | |
1658 | } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name && | |
1659 | strcmp(channel_name, | |
1660 | DEFAULT_LOG4J_CHANNEL_NAME)) { | |
1661 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1662 | goto error; | |
1663 | } | |
a93b3916 | 1664 | /* break is _not_ missing here. */ |
bdf64013 | 1665 | } |
2f77fc4b DG |
1666 | case LTTNG_DOMAIN_UST: |
1667 | { | |
1668 | struct ltt_ust_session *usess = session->ust_session; | |
85076754 MD |
1669 | unsigned int chan_count; |
1670 | ||
2f77fc4b DG |
1671 | assert(usess); |
1672 | ||
85076754 | 1673 | chan_count = lttng_ht_get_count(usess->domain_global.channels); |
979e618e DG |
1674 | if (chan_count == 0) { |
1675 | struct lttng_channel *attr; | |
1676 | /* Create default channel */ | |
0a9c6494 | 1677 | attr = channel_new_default_attr(domain, usess->buffer_type); |
979e618e DG |
1678 | if (attr == NULL) { |
1679 | ret = LTTNG_ERR_FATAL; | |
1680 | goto error; | |
1681 | } | |
1682 | ||
7972aab2 | 1683 | ret = channel_ust_create(usess, attr, usess->buffer_type); |
979e618e DG |
1684 | if (ret != LTTNG_OK) { |
1685 | free(attr); | |
1686 | goto error; | |
1687 | } | |
cf0bcb51 | 1688 | channel_attr_destroy(attr); |
d5979e4a | 1689 | chan_ust_created = 1; |
979e618e DG |
1690 | } |
1691 | ||
601d5acf | 1692 | ret = context_ust_add(usess, domain, ctx, channel_name); |
bdf64013 JG |
1693 | free(app_ctx_provider_name); |
1694 | free(app_ctx_name); | |
1695 | app_ctx_name = NULL; | |
1696 | app_ctx_provider_name = NULL; | |
f73fabfd | 1697 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1698 | goto error; |
1699 | } | |
1700 | break; | |
1701 | } | |
2f77fc4b | 1702 | default: |
f73fabfd | 1703 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1704 | goto error; |
1705 | } | |
1706 | ||
bdf64013 JG |
1707 | ret = LTTNG_OK; |
1708 | goto end; | |
2f77fc4b DG |
1709 | |
1710 | error: | |
d5979e4a DG |
1711 | if (chan_kern_created) { |
1712 | struct ltt_kernel_channel *kchan = | |
1713 | trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME, | |
1714 | session->kernel_session); | |
1715 | /* Created previously, this should NOT fail. */ | |
1716 | assert(kchan); | |
1717 | kernel_destroy_channel(kchan); | |
1718 | } | |
1719 | ||
1720 | if (chan_ust_created) { | |
1721 | struct ltt_ust_channel *uchan = | |
1722 | trace_ust_find_channel_by_name( | |
1723 | session->ust_session->domain_global.channels, | |
1724 | DEFAULT_CHANNEL_NAME); | |
1725 | /* Created previously, this should NOT fail. */ | |
1726 | assert(uchan); | |
1727 | /* Remove from the channel list of the session. */ | |
1728 | trace_ust_delete_channel(session->ust_session->domain_global.channels, | |
1729 | uchan); | |
1730 | trace_ust_destroy_channel(uchan); | |
1731 | } | |
bdf64013 JG |
1732 | end: |
1733 | free(app_ctx_provider_name); | |
1734 | free(app_ctx_name); | |
2f77fc4b DG |
1735 | return ret; |
1736 | } | |
1737 | ||
dac8e046 JG |
1738 | static inline bool name_starts_with(const char *name, const char *prefix) |
1739 | { | |
1740 | const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN); | |
1741 | ||
1742 | return !strncmp(name, prefix, max_cmp_len); | |
1743 | } | |
1744 | ||
1745 | /* Perform userspace-specific event name validation */ | |
1746 | static int validate_ust_event_name(const char *name) | |
1747 | { | |
1748 | int ret = 0; | |
1749 | ||
1750 | if (!name) { | |
1751 | ret = -1; | |
1752 | goto end; | |
1753 | } | |
1754 | ||
1755 | /* | |
1756 | * Check name against all internal UST event component namespaces used | |
1757 | * by the agents. | |
1758 | */ | |
1759 | if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) || | |
1760 | name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) || | |
1761 | name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) { | |
1762 | ret = -1; | |
1763 | } | |
1764 | ||
1765 | end: | |
1766 | return ret; | |
1767 | } | |
88f06f15 | 1768 | |
2f77fc4b | 1769 | /* |
88f06f15 JG |
1770 | * Internal version of cmd_enable_event() with a supplemental |
1771 | * "internal_event" flag which is used to enable internal events which should | |
1772 | * be hidden from clients. Such events are used in the agent implementation to | |
1773 | * enable the events through which all "agent" events are funeled. | |
2f77fc4b | 1774 | */ |
88f06f15 JG |
1775 | static int _cmd_enable_event(struct ltt_session *session, |
1776 | struct lttng_domain *domain, | |
025faf73 | 1777 | char *channel_name, struct lttng_event *event, |
6b453b5e | 1778 | char *filter_expression, |
db8f1377 JI |
1779 | struct lttng_filter_bytecode *filter, |
1780 | struct lttng_event_exclusion *exclusion, | |
88f06f15 | 1781 | int wpipe, bool internal_event) |
2f77fc4b | 1782 | { |
9f449915 | 1783 | int ret = 0, channel_created = 0; |
cfedea03 | 1784 | struct lttng_channel *attr = NULL; |
2f77fc4b DG |
1785 | |
1786 | assert(session); | |
1787 | assert(event); | |
1788 | assert(channel_name); | |
1789 | ||
2a385866 JG |
1790 | /* If we have a filter, we must have its filter expression */ |
1791 | assert(!(!!filter_expression ^ !!filter)); | |
1792 | ||
9f449915 PP |
1793 | /* Normalize event name as a globbing pattern */ |
1794 | strutils_normalize_star_glob_pattern(event->name); | |
18a720cd | 1795 | |
9f449915 PP |
1796 | /* Normalize exclusion names as globbing patterns */ |
1797 | if (exclusion) { | |
1798 | size_t i; | |
f5ac4bd7 | 1799 | |
9f449915 PP |
1800 | for (i = 0; i < exclusion->count; i++) { |
1801 | char *name = LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i); | |
1802 | ||
1803 | strutils_normalize_star_glob_pattern(name); | |
1804 | } | |
930a2e99 JG |
1805 | } |
1806 | ||
9f449915 PP |
1807 | DBG("Enable event command for event \'%s\'", event->name); |
1808 | ||
1809 | rcu_read_lock(); | |
1810 | ||
7972aab2 | 1811 | switch (domain->type) { |
2f77fc4b DG |
1812 | case LTTNG_DOMAIN_KERNEL: |
1813 | { | |
1814 | struct ltt_kernel_channel *kchan; | |
1815 | ||
85076754 MD |
1816 | /* |
1817 | * If a non-default channel has been created in the | |
1818 | * session, explicitely require that -c chan_name needs | |
1819 | * to be provided. | |
1820 | */ | |
1821 | if (session->kernel_session->has_non_default_channel | |
1822 | && channel_name[0] == '\0') { | |
1823 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1824 | goto error; | |
1825 | } | |
1826 | ||
2f77fc4b DG |
1827 | kchan = trace_kernel_get_channel_by_name(channel_name, |
1828 | session->kernel_session); | |
1829 | if (kchan == NULL) { | |
0a9c6494 DG |
1830 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
1831 | LTTNG_BUFFER_GLOBAL); | |
2f77fc4b | 1832 | if (attr == NULL) { |
f73fabfd | 1833 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1834 | goto error; |
1835 | } | |
04c17253 MD |
1836 | if (lttng_strncpy(attr->name, channel_name, |
1837 | sizeof(attr->name))) { | |
1838 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
1839 | goto error; |
1840 | } | |
2f77fc4b DG |
1841 | |
1842 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1843 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1844 | goto error; |
1845 | } | |
e5f5db7f | 1846 | channel_created = 1; |
2f77fc4b DG |
1847 | } |
1848 | ||
1849 | /* Get the newly created kernel channel pointer */ | |
1850 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1851 | session->kernel_session); | |
1852 | if (kchan == NULL) { | |
1853 | /* This sould not happen... */ | |
f73fabfd | 1854 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1855 | goto error; |
1856 | } | |
1857 | ||
6e911cad MD |
1858 | switch (event->type) { |
1859 | case LTTNG_EVENT_ALL: | |
29c62722 | 1860 | { |
00a62084 MD |
1861 | char *filter_expression_a = NULL; |
1862 | struct lttng_filter_bytecode *filter_a = NULL; | |
1863 | ||
1864 | /* | |
1865 | * We need to duplicate filter_expression and filter, | |
1866 | * because ownership is passed to first enable | |
1867 | * event. | |
1868 | */ | |
1869 | if (filter_expression) { | |
1870 | filter_expression_a = strdup(filter_expression); | |
1871 | if (!filter_expression_a) { | |
1872 | ret = LTTNG_ERR_FATAL; | |
1873 | goto error; | |
1874 | } | |
1875 | } | |
1876 | if (filter) { | |
1877 | filter_a = zmalloc(sizeof(*filter_a) + filter->len); | |
1878 | if (!filter_a) { | |
1879 | free(filter_expression_a); | |
1880 | ret = LTTNG_ERR_FATAL; | |
1881 | goto error; | |
1882 | } | |
1883 | memcpy(filter_a, filter, sizeof(*filter_a) + filter->len); | |
1884 | } | |
29c62722 | 1885 | event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */ |
00a62084 MD |
1886 | ret = event_kernel_enable_event(kchan, event, |
1887 | filter_expression, filter); | |
a969e101 MD |
1888 | /* We have passed ownership */ |
1889 | filter_expression = NULL; | |
1890 | filter = NULL; | |
29c62722 MD |
1891 | if (ret != LTTNG_OK) { |
1892 | if (channel_created) { | |
1893 | /* Let's not leak a useless channel. */ | |
1894 | kernel_destroy_channel(kchan); | |
1895 | } | |
00a62084 MD |
1896 | free(filter_expression_a); |
1897 | free(filter_a); | |
29c62722 MD |
1898 | goto error; |
1899 | } | |
1900 | event->type = LTTNG_EVENT_SYSCALL; /* Hack */ | |
00a62084 MD |
1901 | ret = event_kernel_enable_event(kchan, event, |
1902 | filter_expression_a, filter_a); | |
60d21fa2 AB |
1903 | /* We have passed ownership */ |
1904 | filter_expression_a = NULL; | |
1905 | filter_a = NULL; | |
29c62722 MD |
1906 | if (ret != LTTNG_OK) { |
1907 | goto error; | |
1908 | } | |
1909 | break; | |
1910 | } | |
6e6ef3d7 DG |
1911 | case LTTNG_EVENT_PROBE: |
1912 | case LTTNG_EVENT_FUNCTION: | |
1913 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
6e911cad | 1914 | case LTTNG_EVENT_TRACEPOINT: |
00a62084 MD |
1915 | ret = event_kernel_enable_event(kchan, event, |
1916 | filter_expression, filter); | |
a969e101 MD |
1917 | /* We have passed ownership */ |
1918 | filter_expression = NULL; | |
1919 | filter = NULL; | |
6e911cad MD |
1920 | if (ret != LTTNG_OK) { |
1921 | if (channel_created) { | |
1922 | /* Let's not leak a useless channel. */ | |
1923 | kernel_destroy_channel(kchan); | |
1924 | } | |
1925 | goto error; | |
e5f5db7f | 1926 | } |
6e911cad MD |
1927 | break; |
1928 | case LTTNG_EVENT_SYSCALL: | |
00a62084 MD |
1929 | ret = event_kernel_enable_event(kchan, event, |
1930 | filter_expression, filter); | |
a969e101 MD |
1931 | /* We have passed ownership */ |
1932 | filter_expression = NULL; | |
1933 | filter = NULL; | |
e2b957af MD |
1934 | if (ret != LTTNG_OK) { |
1935 | goto error; | |
1936 | } | |
6e911cad MD |
1937 | break; |
1938 | default: | |
1939 | ret = LTTNG_ERR_UNK; | |
2f77fc4b DG |
1940 | goto error; |
1941 | } | |
1942 | ||
1943 | kernel_wait_quiescent(kernel_tracer_fd); | |
1944 | break; | |
1945 | } | |
1946 | case LTTNG_DOMAIN_UST: | |
1947 | { | |
1948 | struct ltt_ust_channel *uchan; | |
1949 | struct ltt_ust_session *usess = session->ust_session; | |
1950 | ||
1951 | assert(usess); | |
1952 | ||
85076754 MD |
1953 | /* |
1954 | * If a non-default channel has been created in the | |
1955 | * session, explicitely require that -c chan_name needs | |
1956 | * to be provided. | |
1957 | */ | |
1958 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1959 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1960 | goto error; | |
1961 | } | |
1962 | ||
2f77fc4b DG |
1963 | /* Get channel from global UST domain */ |
1964 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
1965 | channel_name); | |
1966 | if (uchan == NULL) { | |
1967 | /* Create default channel */ | |
0a9c6494 DG |
1968 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
1969 | usess->buffer_type); | |
2f77fc4b | 1970 | if (attr == NULL) { |
f73fabfd | 1971 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1972 | goto error; |
1973 | } | |
04c17253 MD |
1974 | if (lttng_strncpy(attr->name, channel_name, |
1975 | sizeof(attr->name))) { | |
1976 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
1977 | goto error; |
1978 | } | |
2f77fc4b DG |
1979 | |
1980 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1981 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1982 | goto error; |
1983 | } | |
2f77fc4b DG |
1984 | |
1985 | /* Get the newly created channel reference back */ | |
1986 | uchan = trace_ust_find_channel_by_name( | |
1987 | usess->domain_global.channels, channel_name); | |
1988 | assert(uchan); | |
1989 | } | |
1990 | ||
141feb8c JG |
1991 | if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) { |
1992 | /* | |
1993 | * Don't allow users to add UST events to channels which | |
1994 | * are assigned to a userspace subdomain (JUL, Log4J, | |
1995 | * Python, etc.). | |
1996 | */ | |
1997 | ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN; | |
1998 | goto error; | |
1999 | } | |
2000 | ||
dac8e046 JG |
2001 | if (!internal_event) { |
2002 | /* | |
2003 | * Ensure the event name is not reserved for internal | |
2004 | * use. | |
2005 | */ | |
2006 | ret = validate_ust_event_name(event->name); | |
2007 | if (ret) { | |
2008 | WARN("Userspace event name %s failed validation.", | |
2009 | event->name ? | |
2010 | event->name : "NULL"); | |
2011 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
2012 | goto error; | |
2013 | } | |
2014 | } | |
2015 | ||
2f77fc4b | 2016 | /* At this point, the session and channel exist on the tracer */ |
6b453b5e | 2017 | ret = event_ust_enable_tracepoint(usess, uchan, event, |
88f06f15 JG |
2018 | filter_expression, filter, exclusion, |
2019 | internal_event); | |
49d21f93 MD |
2020 | /* We have passed ownership */ |
2021 | filter_expression = NULL; | |
2022 | filter = NULL; | |
2023 | exclusion = NULL; | |
94382e15 JG |
2024 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2025 | goto already_enabled; | |
2026 | } else if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2027 | goto error; |
2028 | } | |
2029 | break; | |
2030 | } | |
5cdb6027 | 2031 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 2032 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2033 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 2034 | { |
da6c3a50 | 2035 | const char *default_event_name, *default_chan_name; |
fefd409b | 2036 | struct agent *agt; |
f20baf8e DG |
2037 | struct lttng_event uevent; |
2038 | struct lttng_domain tmp_dom; | |
2039 | struct ltt_ust_session *usess = session->ust_session; | |
2040 | ||
2041 | assert(usess); | |
2042 | ||
5cdb6027 | 2043 | agt = trace_ust_find_agent(usess, domain->type); |
fefd409b | 2044 | if (!agt) { |
5cdb6027 | 2045 | agt = agent_create(domain->type); |
fefd409b | 2046 | if (!agt) { |
e5b3c48c | 2047 | ret = LTTNG_ERR_NOMEM; |
fefd409b DG |
2048 | goto error; |
2049 | } | |
2050 | agent_add(agt, usess->agents); | |
2051 | } | |
2052 | ||
022d91ba | 2053 | /* Create the default tracepoint. */ |
996de3c7 | 2054 | memset(&uevent, 0, sizeof(uevent)); |
f20baf8e DG |
2055 | uevent.type = LTTNG_EVENT_TRACEPOINT; |
2056 | uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
51755dc8 JG |
2057 | default_event_name = event_get_default_agent_ust_name( |
2058 | domain->type); | |
da6c3a50 | 2059 | if (!default_event_name) { |
e5b3c48c | 2060 | ret = LTTNG_ERR_FATAL; |
da6c3a50 | 2061 | goto error; |
f43f95a9 | 2062 | } |
da6c3a50 | 2063 | strncpy(uevent.name, default_event_name, sizeof(uevent.name)); |
f20baf8e DG |
2064 | uevent.name[sizeof(uevent.name) - 1] = '\0'; |
2065 | ||
2066 | /* | |
2067 | * The domain type is changed because we are about to enable the | |
2068 | * default channel and event for the JUL domain that are hardcoded. | |
2069 | * This happens in the UST domain. | |
2070 | */ | |
2071 | memcpy(&tmp_dom, domain, sizeof(tmp_dom)); | |
2072 | tmp_dom.type = LTTNG_DOMAIN_UST; | |
2073 | ||
0e115563 DG |
2074 | switch (domain->type) { |
2075 | case LTTNG_DOMAIN_LOG4J: | |
da6c3a50 | 2076 | default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME; |
0e115563 DG |
2077 | break; |
2078 | case LTTNG_DOMAIN_JUL: | |
da6c3a50 | 2079 | default_chan_name = DEFAULT_JUL_CHANNEL_NAME; |
0e115563 DG |
2080 | break; |
2081 | case LTTNG_DOMAIN_PYTHON: | |
2082 | default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
2083 | break; | |
2084 | default: | |
e98a44b0 | 2085 | /* The switch/case we are in makes this impossible */ |
0e115563 | 2086 | assert(0); |
da6c3a50 DG |
2087 | } |
2088 | ||
971da06a | 2089 | { |
8404118c | 2090 | char *filter_expression_copy = NULL; |
51755dc8 | 2091 | struct lttng_filter_bytecode *filter_copy = NULL; |
971da06a JG |
2092 | |
2093 | if (filter) { | |
51755dc8 JG |
2094 | const size_t filter_size = sizeof( |
2095 | struct lttng_filter_bytecode) | |
2096 | + filter->len; | |
2097 | ||
2098 | filter_copy = zmalloc(filter_size); | |
971da06a | 2099 | if (!filter_copy) { |
018096a4 | 2100 | ret = LTTNG_ERR_NOMEM; |
b742e3e2 | 2101 | goto error; |
971da06a | 2102 | } |
51755dc8 | 2103 | memcpy(filter_copy, filter, filter_size); |
971da06a | 2104 | |
8404118c JG |
2105 | filter_expression_copy = |
2106 | strdup(filter_expression); | |
2107 | if (!filter_expression) { | |
2108 | ret = LTTNG_ERR_NOMEM; | |
51755dc8 JG |
2109 | } |
2110 | ||
2111 | if (!filter_expression_copy || !filter_copy) { | |
2112 | free(filter_expression_copy); | |
2113 | free(filter_copy); | |
2114 | goto error; | |
8404118c | 2115 | } |
971da06a JG |
2116 | } |
2117 | ||
88f06f15 | 2118 | ret = cmd_enable_event_internal(session, &tmp_dom, |
971da06a | 2119 | (char *) default_chan_name, |
8404118c JG |
2120 | &uevent, filter_expression_copy, |
2121 | filter_copy, NULL, wpipe); | |
971da06a JG |
2122 | } |
2123 | ||
94382e15 JG |
2124 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2125 | goto already_enabled; | |
2126 | } else if (ret != LTTNG_OK) { | |
f20baf8e DG |
2127 | goto error; |
2128 | } | |
2129 | ||
2130 | /* The wild card * means that everything should be enabled. */ | |
2131 | if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) { | |
8404118c JG |
2132 | ret = event_agent_enable_all(usess, agt, event, filter, |
2133 | filter_expression); | |
f20baf8e | 2134 | } else { |
8404118c JG |
2135 | ret = event_agent_enable(usess, agt, event, filter, |
2136 | filter_expression); | |
f20baf8e | 2137 | } |
51755dc8 JG |
2138 | filter = NULL; |
2139 | filter_expression = NULL; | |
f20baf8e DG |
2140 | if (ret != LTTNG_OK) { |
2141 | goto error; | |
2142 | } | |
2143 | ||
2144 | break; | |
2145 | } | |
2f77fc4b | 2146 | default: |
f73fabfd | 2147 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2148 | goto error; |
2149 | } | |
2150 | ||
f73fabfd | 2151 | ret = LTTNG_OK; |
2f77fc4b | 2152 | |
94382e15 | 2153 | already_enabled: |
2f77fc4b | 2154 | error: |
49d21f93 MD |
2155 | free(filter_expression); |
2156 | free(filter); | |
2157 | free(exclusion); | |
cf0bcb51 | 2158 | channel_attr_destroy(attr); |
2223c96f | 2159 | rcu_read_unlock(); |
2f77fc4b DG |
2160 | return ret; |
2161 | } | |
2162 | ||
88f06f15 JG |
2163 | /* |
2164 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2165 | * We own filter, exclusion, and filter_expression. | |
2166 | */ | |
2167 | int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain, | |
2168 | char *channel_name, struct lttng_event *event, | |
2169 | char *filter_expression, | |
2170 | struct lttng_filter_bytecode *filter, | |
2171 | struct lttng_event_exclusion *exclusion, | |
2172 | int wpipe) | |
2173 | { | |
2174 | return _cmd_enable_event(session, domain, channel_name, event, | |
2175 | filter_expression, filter, exclusion, wpipe, false); | |
2176 | } | |
2177 | ||
2178 | /* | |
2179 | * Enable an event which is internal to LTTng. An internal should | |
2180 | * never be made visible to clients and are immune to checks such as | |
2181 | * reserved names. | |
2182 | */ | |
2183 | static int cmd_enable_event_internal(struct ltt_session *session, | |
2184 | struct lttng_domain *domain, | |
2185 | char *channel_name, struct lttng_event *event, | |
2186 | char *filter_expression, | |
2187 | struct lttng_filter_bytecode *filter, | |
2188 | struct lttng_event_exclusion *exclusion, | |
2189 | int wpipe) | |
2190 | { | |
2191 | return _cmd_enable_event(session, domain, channel_name, event, | |
2192 | filter_expression, filter, exclusion, wpipe, true); | |
2193 | } | |
2194 | ||
2f77fc4b DG |
2195 | /* |
2196 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2197 | */ | |
56a37563 JG |
2198 | ssize_t cmd_list_tracepoints(enum lttng_domain_type domain, |
2199 | struct lttng_event **events) | |
2f77fc4b DG |
2200 | { |
2201 | int ret; | |
2202 | ssize_t nb_events = 0; | |
2203 | ||
2204 | switch (domain) { | |
2205 | case LTTNG_DOMAIN_KERNEL: | |
2206 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2207 | if (nb_events < 0) { | |
f73fabfd | 2208 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
2f77fc4b DG |
2209 | goto error; |
2210 | } | |
2211 | break; | |
2212 | case LTTNG_DOMAIN_UST: | |
2213 | nb_events = ust_app_list_events(events); | |
2214 | if (nb_events < 0) { | |
f73fabfd | 2215 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2216 | goto error; |
2217 | } | |
2218 | break; | |
5cdb6027 | 2219 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2220 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2221 | case LTTNG_DOMAIN_PYTHON: |
f60140a1 | 2222 | nb_events = agent_list_events(events, domain); |
3c6a091f DG |
2223 | if (nb_events < 0) { |
2224 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2225 | goto error; | |
2226 | } | |
2227 | break; | |
2f77fc4b | 2228 | default: |
f73fabfd | 2229 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2230 | goto error; |
2231 | } | |
2232 | ||
2233 | return nb_events; | |
2234 | ||
2235 | error: | |
2236 | /* Return negative value to differentiate return code */ | |
2237 | return -ret; | |
2238 | } | |
2239 | ||
2240 | /* | |
2241 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
2242 | */ | |
56a37563 | 2243 | ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain, |
2f77fc4b DG |
2244 | struct lttng_event_field **fields) |
2245 | { | |
2246 | int ret; | |
2247 | ssize_t nb_fields = 0; | |
2248 | ||
2249 | switch (domain) { | |
2250 | case LTTNG_DOMAIN_UST: | |
2251 | nb_fields = ust_app_list_event_fields(fields); | |
2252 | if (nb_fields < 0) { | |
f73fabfd | 2253 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2254 | goto error; |
2255 | } | |
2256 | break; | |
2257 | case LTTNG_DOMAIN_KERNEL: | |
2258 | default: /* fall-through */ | |
f73fabfd | 2259 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2260 | goto error; |
2261 | } | |
2262 | ||
2263 | return nb_fields; | |
2264 | ||
2265 | error: | |
2266 | /* Return negative value to differentiate return code */ | |
2267 | return -ret; | |
2268 | } | |
2269 | ||
834978fd DG |
2270 | ssize_t cmd_list_syscalls(struct lttng_event **events) |
2271 | { | |
2272 | return syscall_table_list(events); | |
2273 | } | |
2274 | ||
a5dfbb9d MD |
2275 | /* |
2276 | * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread. | |
2277 | * | |
2278 | * Called with session lock held. | |
2279 | */ | |
2280 | ssize_t cmd_list_tracker_pids(struct ltt_session *session, | |
56a37563 | 2281 | enum lttng_domain_type domain, int32_t **pids) |
a5dfbb9d MD |
2282 | { |
2283 | int ret; | |
2284 | ssize_t nr_pids = 0; | |
2285 | ||
2286 | switch (domain) { | |
2287 | case LTTNG_DOMAIN_KERNEL: | |
2288 | { | |
2289 | struct ltt_kernel_session *ksess; | |
2290 | ||
2291 | ksess = session->kernel_session; | |
2292 | nr_pids = kernel_list_tracker_pids(ksess, pids); | |
2293 | if (nr_pids < 0) { | |
2294 | ret = LTTNG_ERR_KERN_LIST_FAIL; | |
2295 | goto error; | |
2296 | } | |
2297 | break; | |
2298 | } | |
2299 | case LTTNG_DOMAIN_UST: | |
2300 | { | |
2301 | struct ltt_ust_session *usess; | |
2302 | ||
2303 | usess = session->ust_session; | |
2304 | nr_pids = trace_ust_list_tracker_pids(usess, pids); | |
2305 | if (nr_pids < 0) { | |
2306 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2307 | goto error; | |
2308 | } | |
2309 | break; | |
2310 | } | |
2311 | case LTTNG_DOMAIN_LOG4J: | |
2312 | case LTTNG_DOMAIN_JUL: | |
2313 | case LTTNG_DOMAIN_PYTHON: | |
2314 | default: | |
2315 | ret = LTTNG_ERR_UND; | |
2316 | goto error; | |
2317 | } | |
2318 | ||
2319 | return nr_pids; | |
2320 | ||
2321 | error: | |
2322 | /* Return negative value to differentiate return code */ | |
2323 | return -ret; | |
2324 | } | |
2325 | ||
2f77fc4b DG |
2326 | /* |
2327 | * Command LTTNG_START_TRACE processed by the client thread. | |
a9ad0c8f MD |
2328 | * |
2329 | * Called with session mutex held. | |
2f77fc4b DG |
2330 | */ |
2331 | int cmd_start_trace(struct ltt_session *session) | |
2332 | { | |
2333 | int ret; | |
cde3e505 | 2334 | unsigned long nb_chan = 0; |
2f77fc4b DG |
2335 | struct ltt_kernel_session *ksession; |
2336 | struct ltt_ust_session *usess; | |
2f77fc4b DG |
2337 | |
2338 | assert(session); | |
2339 | ||
2340 | /* Ease our life a bit ;) */ | |
2341 | ksession = session->kernel_session; | |
2342 | usess = session->ust_session; | |
2343 | ||
8382cf6f DG |
2344 | /* Is the session already started? */ |
2345 | if (session->active) { | |
f73fabfd | 2346 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2347 | goto error; |
2348 | } | |
2349 | ||
cde3e505 DG |
2350 | /* |
2351 | * Starting a session without channel is useless since after that it's not | |
2352 | * possible to enable channel thus inform the client. | |
2353 | */ | |
2354 | if (usess && usess->domain_global.channels) { | |
2355 | nb_chan += lttng_ht_get_count(usess->domain_global.channels); | |
2356 | } | |
2357 | if (ksession) { | |
2358 | nb_chan += ksession->channel_count; | |
2359 | } | |
2360 | if (!nb_chan) { | |
2361 | ret = LTTNG_ERR_NO_CHANNEL; | |
2362 | goto error; | |
2363 | } | |
2364 | ||
2f77fc4b DG |
2365 | /* Kernel tracing */ |
2366 | if (ksession != NULL) { | |
9b6c7ec5 DG |
2367 | ret = start_kernel_session(ksession, kernel_tracer_fd); |
2368 | if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2369 | goto error; |
2370 | } | |
2f77fc4b DG |
2371 | } |
2372 | ||
2373 | /* Flag session that trace should start automatically */ | |
2374 | if (usess) { | |
14fb1ebe DG |
2375 | /* |
2376 | * Even though the start trace might fail, flag this session active so | |
2377 | * other application coming in are started by default. | |
2378 | */ | |
2379 | usess->active = 1; | |
2f77fc4b DG |
2380 | |
2381 | ret = ust_app_start_trace_all(usess); | |
2382 | if (ret < 0) { | |
f73fabfd | 2383 | ret = LTTNG_ERR_UST_START_FAIL; |
2f77fc4b DG |
2384 | goto error; |
2385 | } | |
2386 | } | |
2387 | ||
8382cf6f DG |
2388 | /* Flag this after a successful start. */ |
2389 | session->has_been_started = 1; | |
2390 | session->active = 1; | |
9b6c7ec5 | 2391 | |
f73fabfd | 2392 | ret = LTTNG_OK; |
2f77fc4b DG |
2393 | |
2394 | error: | |
2395 | return ret; | |
2396 | } | |
2397 | ||
2398 | /* | |
2399 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2400 | */ | |
2401 | int cmd_stop_trace(struct ltt_session *session) | |
2402 | { | |
2403 | int ret; | |
2404 | struct ltt_kernel_channel *kchan; | |
2405 | struct ltt_kernel_session *ksession; | |
2406 | struct ltt_ust_session *usess; | |
2407 | ||
2408 | assert(session); | |
2409 | ||
2410 | /* Short cut */ | |
2411 | ksession = session->kernel_session; | |
2412 | usess = session->ust_session; | |
2413 | ||
8382cf6f DG |
2414 | /* Session is not active. Skip everythong and inform the client. */ |
2415 | if (!session->active) { | |
f73fabfd | 2416 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
2f77fc4b DG |
2417 | goto error; |
2418 | } | |
2419 | ||
2f77fc4b | 2420 | /* Kernel tracer */ |
14fb1ebe | 2421 | if (ksession && ksession->active) { |
2f77fc4b DG |
2422 | DBG("Stop kernel tracing"); |
2423 | ||
566d8970 MD |
2424 | ret = kernel_stop_session(ksession); |
2425 | if (ret < 0) { | |
2426 | ret = LTTNG_ERR_KERN_STOP_FAIL; | |
2427 | goto error; | |
2428 | } | |
2429 | ||
2430 | kernel_wait_quiescent(kernel_tracer_fd); | |
2431 | ||
2432 | /* Flush metadata after stopping (if exists) */ | |
2f77fc4b DG |
2433 | if (ksession->metadata_stream_fd >= 0) { |
2434 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2435 | if (ret < 0) { | |
2436 | ERR("Kernel metadata flush failed"); | |
2437 | } | |
2438 | } | |
2439 | ||
566d8970 | 2440 | /* Flush all buffers after stopping */ |
2f77fc4b DG |
2441 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2442 | ret = kernel_flush_buffer(kchan); | |
2443 | if (ret < 0) { | |
2444 | ERR("Kernel flush buffer error"); | |
2445 | } | |
2446 | } | |
2447 | ||
14fb1ebe | 2448 | ksession->active = 0; |
2f77fc4b DG |
2449 | } |
2450 | ||
14fb1ebe DG |
2451 | if (usess && usess->active) { |
2452 | /* | |
2453 | * Even though the stop trace might fail, flag this session inactive so | |
2454 | * other application coming in are not started by default. | |
2455 | */ | |
2456 | usess->active = 0; | |
2f77fc4b DG |
2457 | |
2458 | ret = ust_app_stop_trace_all(usess); | |
2459 | if (ret < 0) { | |
f73fabfd | 2460 | ret = LTTNG_ERR_UST_STOP_FAIL; |
2f77fc4b DG |
2461 | goto error; |
2462 | } | |
2463 | } | |
2464 | ||
8382cf6f DG |
2465 | /* Flag inactive after a successful stop. */ |
2466 | session->active = 0; | |
f73fabfd | 2467 | ret = LTTNG_OK; |
2f77fc4b DG |
2468 | |
2469 | error: | |
2470 | return ret; | |
2471 | } | |
2472 | ||
2473 | /* | |
2474 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
2475 | */ | |
bda32d56 JG |
2476 | int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri, |
2477 | struct lttng_uri *uris) | |
2f77fc4b DG |
2478 | { |
2479 | int ret, i; | |
2480 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2481 | struct ltt_ust_session *usess = session->ust_session; | |
2f77fc4b DG |
2482 | |
2483 | assert(session); | |
2484 | assert(uris); | |
2485 | assert(nb_uri > 0); | |
2486 | ||
8382cf6f DG |
2487 | /* Can't set consumer URI if the session is active. */ |
2488 | if (session->active) { | |
f73fabfd | 2489 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2490 | goto error; |
2491 | } | |
2492 | ||
bda32d56 | 2493 | /* Set the "global" consumer URIs */ |
2f77fc4b | 2494 | for (i = 0; i < nb_uri; i++) { |
bda32d56 JG |
2495 | ret = add_uri_to_consumer(session->consumer, |
2496 | &uris[i], 0, session->name); | |
a74934ba | 2497 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2498 | goto error; |
2499 | } | |
2f77fc4b DG |
2500 | } |
2501 | ||
bda32d56 JG |
2502 | /* Set UST session URIs */ |
2503 | if (session->ust_session) { | |
2504 | for (i = 0; i < nb_uri; i++) { | |
2505 | ret = add_uri_to_consumer( | |
2506 | session->ust_session->consumer, | |
2507 | &uris[i], LTTNG_DOMAIN_UST, | |
2508 | session->name); | |
2509 | if (ret != LTTNG_OK) { | |
2510 | goto error; | |
2511 | } | |
2512 | } | |
2513 | } | |
2514 | ||
2515 | /* Set kernel session URIs */ | |
2516 | if (session->kernel_session) { | |
2517 | for (i = 0; i < nb_uri; i++) { | |
2518 | ret = add_uri_to_consumer( | |
2519 | session->kernel_session->consumer, | |
2520 | &uris[i], LTTNG_DOMAIN_KERNEL, | |
2521 | session->name); | |
2522 | if (ret != LTTNG_OK) { | |
2523 | goto error; | |
2524 | } | |
2525 | } | |
2526 | } | |
2527 | ||
7ab70fe0 DG |
2528 | /* |
2529 | * Make sure to set the session in output mode after we set URI since a | |
2530 | * session can be created without URL (thus flagged in no output mode). | |
2531 | */ | |
2532 | session->output_traces = 1; | |
2533 | if (ksess) { | |
2534 | ksess->output_traces = 1; | |
bda32d56 JG |
2535 | } |
2536 | ||
2537 | if (usess) { | |
7ab70fe0 DG |
2538 | usess->output_traces = 1; |
2539 | } | |
2540 | ||
2f77fc4b | 2541 | /* All good! */ |
f73fabfd | 2542 | ret = LTTNG_OK; |
2f77fc4b DG |
2543 | |
2544 | error: | |
2545 | return ret; | |
2546 | } | |
2547 | ||
2548 | /* | |
2549 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2550 | */ | |
2551 | int cmd_create_session_uri(char *name, struct lttng_uri *uris, | |
ecc48a90 | 2552 | size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer) |
2f77fc4b DG |
2553 | { |
2554 | int ret; | |
2f77fc4b DG |
2555 | struct ltt_session *session; |
2556 | ||
2557 | assert(name); | |
2bba9e53 | 2558 | assert(creds); |
785d2d0d | 2559 | |
2f77fc4b DG |
2560 | /* |
2561 | * Verify if the session already exist | |
2562 | * | |
2563 | * XXX: There is no need for the session lock list here since the caller | |
2564 | * (process_client_msg) is holding it. We might want to change that so a | |
2565 | * single command does not lock the entire session list. | |
2566 | */ | |
2567 | session = session_find_by_name(name); | |
2568 | if (session != NULL) { | |
f73fabfd | 2569 | ret = LTTNG_ERR_EXIST_SESS; |
2f77fc4b DG |
2570 | goto find_error; |
2571 | } | |
2572 | ||
2573 | /* Create tracing session in the registry */ | |
dec56f6c | 2574 | ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds), |
2f77fc4b | 2575 | LTTNG_SOCK_GET_GID_CRED(creds)); |
f73fabfd | 2576 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2577 | goto session_error; |
2578 | } | |
2579 | ||
2580 | /* | |
2581 | * Get the newly created session pointer back | |
2582 | * | |
2583 | * XXX: There is no need for the session lock list here since the caller | |
2584 | * (process_client_msg) is holding it. We might want to change that so a | |
2585 | * single command does not lock the entire session list. | |
2586 | */ | |
2587 | session = session_find_by_name(name); | |
2588 | assert(session); | |
2589 | ||
ecc48a90 | 2590 | session->live_timer = live_timer; |
2f77fc4b DG |
2591 | /* Create default consumer output for the session not yet created. */ |
2592 | session->consumer = consumer_create_output(CONSUMER_DST_LOCAL); | |
2593 | if (session->consumer == NULL) { | |
f73fabfd | 2594 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2595 | goto consumer_error; |
2596 | } | |
2597 | ||
2bba9e53 | 2598 | if (uris) { |
bda32d56 | 2599 | ret = cmd_set_consumer_uri(session, nb_uri, uris); |
2bba9e53 DG |
2600 | if (ret != LTTNG_OK) { |
2601 | goto consumer_error; | |
2602 | } | |
2603 | session->output_traces = 1; | |
2604 | } else { | |
2605 | session->output_traces = 0; | |
2606 | DBG2("Session %s created with no output", session->name); | |
2f77fc4b DG |
2607 | } |
2608 | ||
2609 | session->consumer->enabled = 1; | |
2610 | ||
f73fabfd | 2611 | return LTTNG_OK; |
2f77fc4b DG |
2612 | |
2613 | consumer_error: | |
2614 | session_destroy(session); | |
2615 | session_error: | |
2616 | find_error: | |
2617 | return ret; | |
2618 | } | |
2619 | ||
27babd3a DG |
2620 | /* |
2621 | * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread. | |
2622 | */ | |
2623 | int cmd_create_session_snapshot(char *name, struct lttng_uri *uris, | |
2624 | size_t nb_uri, lttng_sock_cred *creds) | |
2625 | { | |
2626 | int ret; | |
2627 | struct ltt_session *session; | |
2628 | struct snapshot_output *new_output = NULL; | |
2629 | ||
2630 | assert(name); | |
2631 | assert(creds); | |
2632 | ||
2633 | /* | |
2634 | * Create session in no output mode with URIs set to NULL. The uris we've | |
2635 | * received are for a default snapshot output if one. | |
2636 | */ | |
ae58b817 | 2637 | ret = cmd_create_session_uri(name, NULL, 0, creds, 0); |
27babd3a DG |
2638 | if (ret != LTTNG_OK) { |
2639 | goto error; | |
2640 | } | |
2641 | ||
2642 | /* Get the newly created session pointer back. This should NEVER fail. */ | |
2643 | session = session_find_by_name(name); | |
2644 | assert(session); | |
2645 | ||
2646 | /* Flag session for snapshot mode. */ | |
2647 | session->snapshot_mode = 1; | |
2648 | ||
2649 | /* Skip snapshot output creation if no URI is given. */ | |
2650 | if (nb_uri == 0) { | |
2651 | goto end; | |
2652 | } | |
2653 | ||
2654 | new_output = snapshot_output_alloc(); | |
2655 | if (!new_output) { | |
2656 | ret = LTTNG_ERR_NOMEM; | |
2657 | goto error_snapshot_alloc; | |
2658 | } | |
2659 | ||
2660 | ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL, | |
2661 | uris, nb_uri, session->consumer, new_output, &session->snapshot); | |
2662 | if (ret < 0) { | |
2663 | if (ret == -ENOMEM) { | |
2664 | ret = LTTNG_ERR_NOMEM; | |
2665 | } else { | |
2666 | ret = LTTNG_ERR_INVALID; | |
2667 | } | |
2668 | goto error_snapshot; | |
2669 | } | |
2670 | ||
2671 | rcu_read_lock(); | |
2672 | snapshot_add_output(&session->snapshot, new_output); | |
2673 | rcu_read_unlock(); | |
2674 | ||
2675 | end: | |
2676 | return LTTNG_OK; | |
2677 | ||
2678 | error_snapshot: | |
2679 | snapshot_output_destroy(new_output); | |
2680 | error_snapshot_alloc: | |
2681 | session_destroy(session); | |
2682 | error: | |
2683 | return ret; | |
2684 | } | |
2685 | ||
2f77fc4b DG |
2686 | /* |
2687 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
a9ad0c8f MD |
2688 | * |
2689 | * Called with session lock held. | |
2f77fc4b DG |
2690 | */ |
2691 | int cmd_destroy_session(struct ltt_session *session, int wpipe) | |
2692 | { | |
2693 | int ret; | |
2694 | struct ltt_ust_session *usess; | |
2695 | struct ltt_kernel_session *ksess; | |
2696 | ||
2697 | /* Safety net */ | |
2698 | assert(session); | |
2699 | ||
2700 | usess = session->ust_session; | |
2701 | ksess = session->kernel_session; | |
2702 | ||
2703 | /* Clean kernel session teardown */ | |
2704 | kernel_destroy_session(ksess); | |
2705 | ||
2706 | /* UST session teardown */ | |
2707 | if (usess) { | |
2708 | /* Close any relayd session */ | |
2709 | consumer_output_send_destroy_relayd(usess->consumer); | |
2710 | ||
2711 | /* Destroy every UST application related to this session. */ | |
2712 | ret = ust_app_destroy_trace_all(usess); | |
2713 | if (ret) { | |
2714 | ERR("Error in ust_app_destroy_trace_all"); | |
2715 | } | |
2716 | ||
2717 | /* Clean up the rest. */ | |
2718 | trace_ust_destroy_session(usess); | |
2719 | } | |
2720 | ||
2721 | /* | |
2722 | * Must notify the kernel thread here to update it's poll set in order to | |
2723 | * remove the channel(s)' fd just destroyed. | |
2724 | */ | |
2725 | ret = notify_thread_pipe(wpipe); | |
2726 | if (ret < 0) { | |
2727 | PERROR("write kernel poll pipe"); | |
2728 | } | |
2729 | ||
2730 | ret = session_destroy(session); | |
2731 | ||
2732 | return ret; | |
2733 | } | |
2734 | ||
2f77fc4b DG |
2735 | /* |
2736 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
2737 | */ | |
56a37563 JG |
2738 | int cmd_register_consumer(struct ltt_session *session, |
2739 | enum lttng_domain_type domain, const char *sock_path, | |
2740 | struct consumer_data *cdata) | |
2f77fc4b DG |
2741 | { |
2742 | int ret, sock; | |
dd81b457 | 2743 | struct consumer_socket *socket = NULL; |
2f77fc4b DG |
2744 | |
2745 | assert(session); | |
2746 | assert(cdata); | |
2747 | assert(sock_path); | |
2748 | ||
2749 | switch (domain) { | |
2750 | case LTTNG_DOMAIN_KERNEL: | |
2751 | { | |
2752 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2753 | ||
2754 | assert(ksess); | |
2755 | ||
2756 | /* Can't register a consumer if there is already one */ | |
2757 | if (ksess->consumer_fds_sent != 0) { | |
f73fabfd | 2758 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
2759 | goto error; |
2760 | } | |
2761 | ||
2762 | sock = lttcomm_connect_unix_sock(sock_path); | |
2763 | if (sock < 0) { | |
f73fabfd | 2764 | ret = LTTNG_ERR_CONNECT_FAIL; |
2f77fc4b DG |
2765 | goto error; |
2766 | } | |
4ce514c4 | 2767 | cdata->cmd_sock = sock; |
2f77fc4b | 2768 | |
4ce514c4 | 2769 | socket = consumer_allocate_socket(&cdata->cmd_sock); |
2f77fc4b | 2770 | if (socket == NULL) { |
f66c074c DG |
2771 | ret = close(sock); |
2772 | if (ret < 0) { | |
2773 | PERROR("close register consumer"); | |
2774 | } | |
4ce514c4 | 2775 | cdata->cmd_sock = -1; |
f73fabfd | 2776 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2777 | goto error; |
2778 | } | |
2779 | ||
2780 | socket->lock = zmalloc(sizeof(pthread_mutex_t)); | |
2781 | if (socket->lock == NULL) { | |
2782 | PERROR("zmalloc pthread mutex"); | |
f73fabfd | 2783 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2784 | goto error; |
2785 | } | |
2786 | pthread_mutex_init(socket->lock, NULL); | |
2787 | socket->registered = 1; | |
2788 | ||
2789 | rcu_read_lock(); | |
2790 | consumer_add_socket(socket, ksess->consumer); | |
2791 | rcu_read_unlock(); | |
2792 | ||
2793 | pthread_mutex_lock(&cdata->pid_mutex); | |
2794 | cdata->pid = -1; | |
2795 | pthread_mutex_unlock(&cdata->pid_mutex); | |
2796 | ||
2797 | break; | |
2798 | } | |
2799 | default: | |
2800 | /* TODO: Userspace tracing */ | |
f73fabfd | 2801 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2802 | goto error; |
2803 | } | |
2804 | ||
dd81b457 | 2805 | return LTTNG_OK; |
2f77fc4b DG |
2806 | |
2807 | error: | |
dd81b457 DG |
2808 | if (socket) { |
2809 | consumer_destroy_socket(socket); | |
2810 | } | |
2f77fc4b DG |
2811 | return ret; |
2812 | } | |
2813 | ||
2814 | /* | |
2815 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
2816 | */ | |
2817 | ssize_t cmd_list_domains(struct ltt_session *session, | |
2818 | struct lttng_domain **domains) | |
2819 | { | |
2820 | int ret, index = 0; | |
2821 | ssize_t nb_dom = 0; | |
fefd409b DG |
2822 | struct agent *agt; |
2823 | struct lttng_ht_iter iter; | |
2f77fc4b DG |
2824 | |
2825 | if (session->kernel_session != NULL) { | |
2826 | DBG3("Listing domains found kernel domain"); | |
2827 | nb_dom++; | |
2828 | } | |
2829 | ||
2830 | if (session->ust_session != NULL) { | |
2831 | DBG3("Listing domains found UST global domain"); | |
2832 | nb_dom++; | |
3c6a091f | 2833 | |
e0a74f01 | 2834 | rcu_read_lock(); |
fefd409b DG |
2835 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2836 | agt, node.node) { | |
2837 | if (agt->being_used) { | |
2838 | nb_dom++; | |
2839 | } | |
3c6a091f | 2840 | } |
e0a74f01 | 2841 | rcu_read_unlock(); |
2f77fc4b DG |
2842 | } |
2843 | ||
fa64dfb4 JG |
2844 | if (!nb_dom) { |
2845 | goto end; | |
2846 | } | |
2847 | ||
2f77fc4b DG |
2848 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
2849 | if (*domains == NULL) { | |
f73fabfd | 2850 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2851 | goto error; |
2852 | } | |
2853 | ||
2854 | if (session->kernel_session != NULL) { | |
2855 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
b5edb9e8 PP |
2856 | |
2857 | /* Kernel session buffer type is always GLOBAL */ | |
2858 | (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL; | |
2859 | ||
2f77fc4b DG |
2860 | index++; |
2861 | } | |
2862 | ||
2863 | if (session->ust_session != NULL) { | |
2864 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
88c5f0d8 | 2865 | (*domains)[index].buf_type = session->ust_session->buffer_type; |
2f77fc4b | 2866 | index++; |
3c6a091f | 2867 | |
e0a74f01 | 2868 | rcu_read_lock(); |
fefd409b DG |
2869 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2870 | agt, node.node) { | |
2871 | if (agt->being_used) { | |
2872 | (*domains)[index].type = agt->domain; | |
2873 | (*domains)[index].buf_type = session->ust_session->buffer_type; | |
2874 | index++; | |
2875 | } | |
3c6a091f | 2876 | } |
e0a74f01 | 2877 | rcu_read_unlock(); |
2f77fc4b | 2878 | } |
fa64dfb4 | 2879 | end: |
2f77fc4b DG |
2880 | return nb_dom; |
2881 | ||
2882 | error: | |
f73fabfd DG |
2883 | /* Return negative value to differentiate return code */ |
2884 | return -ret; | |
2f77fc4b DG |
2885 | } |
2886 | ||
2887 | ||
2888 | /* | |
2889 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
2890 | */ | |
56a37563 JG |
2891 | ssize_t cmd_list_channels(enum lttng_domain_type domain, |
2892 | struct ltt_session *session, struct lttng_channel **channels) | |
2f77fc4b | 2893 | { |
53e367f9 | 2894 | ssize_t nb_chan = 0, payload_size = 0, ret; |
2f77fc4b DG |
2895 | |
2896 | switch (domain) { | |
2897 | case LTTNG_DOMAIN_KERNEL: | |
2898 | if (session->kernel_session != NULL) { | |
2899 | nb_chan = session->kernel_session->channel_count; | |
2900 | } | |
2901 | DBG3("Number of kernel channels %zd", nb_chan); | |
c7d620a2 | 2902 | if (nb_chan <= 0) { |
53e367f9 JG |
2903 | ret = -LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2904 | goto end; | |
c7d620a2 | 2905 | } |
2f77fc4b DG |
2906 | break; |
2907 | case LTTNG_DOMAIN_UST: | |
2908 | if (session->ust_session != NULL) { | |
7ffc31a2 | 2909 | rcu_read_lock(); |
2f77fc4b | 2910 | nb_chan = lttng_ht_get_count( |
7ffc31a2 JG |
2911 | session->ust_session->domain_global.channels); |
2912 | rcu_read_unlock(); | |
2f77fc4b DG |
2913 | } |
2914 | DBG3("Number of UST global channels %zd", nb_chan); | |
ade7ce52 | 2915 | if (nb_chan < 0) { |
53e367f9 JG |
2916 | ret = -LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2917 | goto end; | |
c7d620a2 | 2918 | } |
2f77fc4b DG |
2919 | break; |
2920 | default: | |
53e367f9 JG |
2921 | ret = -LTTNG_ERR_UND; |
2922 | goto end; | |
2f77fc4b DG |
2923 | } |
2924 | ||
2925 | if (nb_chan > 0) { | |
53e367f9 | 2926 | const size_t channel_size = sizeof(struct lttng_channel) + |
cf0bcb51 JG |
2927 | sizeof(struct lttng_channel_extended); |
2928 | struct lttng_channel_extended *channel_exts; | |
53e367f9 JG |
2929 | |
2930 | payload_size = nb_chan * channel_size; | |
2931 | *channels = zmalloc(payload_size); | |
2f77fc4b | 2932 | if (*channels == NULL) { |
53e367f9 JG |
2933 | ret = -LTTNG_ERR_FATAL; |
2934 | goto end; | |
2f77fc4b DG |
2935 | } |
2936 | ||
53e367f9 JG |
2937 | channel_exts = ((void *) *channels) + |
2938 | (nb_chan * sizeof(struct lttng_channel)); | |
2939 | list_lttng_channels(domain, session, *channels, channel_exts); | |
2940 | } else { | |
2941 | *channels = NULL; | |
2f77fc4b DG |
2942 | } |
2943 | ||
53e367f9 JG |
2944 | ret = payload_size; |
2945 | end: | |
2946 | return ret; | |
2f77fc4b DG |
2947 | } |
2948 | ||
2949 | /* | |
2950 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
2951 | */ | |
56a37563 JG |
2952 | ssize_t cmd_list_events(enum lttng_domain_type domain, |
2953 | struct ltt_session *session, char *channel_name, | |
b4e3ceb9 | 2954 | struct lttng_event **events, size_t *total_size) |
2f77fc4b DG |
2955 | { |
2956 | int ret = 0; | |
2957 | ssize_t nb_event = 0; | |
2958 | ||
2959 | switch (domain) { | |
2960 | case LTTNG_DOMAIN_KERNEL: | |
2961 | if (session->kernel_session != NULL) { | |
2962 | nb_event = list_lttng_kernel_events(channel_name, | |
b4e3ceb9 PP |
2963 | session->kernel_session, events, |
2964 | total_size); | |
2f77fc4b DG |
2965 | } |
2966 | break; | |
2967 | case LTTNG_DOMAIN_UST: | |
2968 | { | |
2969 | if (session->ust_session != NULL) { | |
2970 | nb_event = list_lttng_ust_global_events(channel_name, | |
b4e3ceb9 PP |
2971 | &session->ust_session->domain_global, events, |
2972 | total_size); | |
2f77fc4b DG |
2973 | } |
2974 | break; | |
2975 | } | |
5cdb6027 | 2976 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2977 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2978 | case LTTNG_DOMAIN_PYTHON: |
3c6a091f | 2979 | if (session->ust_session) { |
fefd409b DG |
2980 | struct lttng_ht_iter iter; |
2981 | struct agent *agt; | |
2982 | ||
b11feea5 | 2983 | rcu_read_lock(); |
fefd409b DG |
2984 | cds_lfht_for_each_entry(session->ust_session->agents->ht, |
2985 | &iter.iter, agt, node.node) { | |
1dfd9906 JG |
2986 | if (agt->domain == domain) { |
2987 | nb_event = list_lttng_agent_events( | |
b4e3ceb9 PP |
2988 | agt, events, |
2989 | total_size); | |
1dfd9906 JG |
2990 | break; |
2991 | } | |
fefd409b | 2992 | } |
b11feea5 | 2993 | rcu_read_unlock(); |
3c6a091f DG |
2994 | } |
2995 | break; | |
2f77fc4b | 2996 | default: |
f73fabfd | 2997 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2998 | goto error; |
2999 | } | |
3000 | ||
f73fabfd | 3001 | return nb_event; |
2f77fc4b DG |
3002 | |
3003 | error: | |
f73fabfd DG |
3004 | /* Return negative value to differentiate return code */ |
3005 | return -ret; | |
2f77fc4b DG |
3006 | } |
3007 | ||
3008 | /* | |
3009 | * Using the session list, filled a lttng_session array to send back to the | |
3010 | * client for session listing. | |
3011 | * | |
3012 | * The session list lock MUST be acquired before calling this function. Use | |
3013 | * session_lock_list() and session_unlock_list(). | |
3014 | */ | |
3015 | void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid, | |
3016 | gid_t gid) | |
3017 | { | |
3018 | int ret; | |
3019 | unsigned int i = 0; | |
3020 | struct ltt_session *session; | |
3021 | struct ltt_session_list *list = session_get_list(); | |
3022 | ||
3023 | DBG("Getting all available session for UID %d GID %d", | |
3024 | uid, gid); | |
3025 | /* | |
3026 | * Iterate over session list and append data after the control struct in | |
3027 | * the buffer. | |
3028 | */ | |
3029 | cds_list_for_each_entry(session, &list->head, list) { | |
3030 | /* | |
3031 | * Only list the sessions the user can control. | |
3032 | */ | |
3033 | if (!session_access_ok(session, uid, gid)) { | |
3034 | continue; | |
3035 | } | |
3036 | ||
3037 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3038 | struct ltt_ust_session *usess = session->ust_session; | |
3039 | ||
3040 | if (session->consumer->type == CONSUMER_DST_NET || | |
3041 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
3042 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
3043 | ret = build_network_session_path(sessions[i].path, | |
dec56f6c | 3044 | sizeof(sessions[i].path), session); |
2f77fc4b | 3045 | } else { |
dec56f6c | 3046 | ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s", |
2f77fc4b DG |
3047 | session->consumer->dst.trace_path); |
3048 | } | |
3049 | if (ret < 0) { | |
3050 | PERROR("snprintf session path"); | |
3051 | continue; | |
3052 | } | |
3053 | ||
3054 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
3055 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
8382cf6f | 3056 | sessions[i].enabled = session->active; |
2cbf8fed | 3057 | sessions[i].snapshot_mode = session->snapshot_mode; |
8960e9cd | 3058 | sessions[i].live_timer_interval = session->live_timer; |
2f77fc4b DG |
3059 | i++; |
3060 | } | |
3061 | } | |
3062 | ||
806e2684 | 3063 | /* |
6d805429 | 3064 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
d3f14b8a | 3065 | * ready for trace analysis (or any kind of reader) or else 1 for pending data. |
806e2684 | 3066 | */ |
6d805429 | 3067 | int cmd_data_pending(struct ltt_session *session) |
806e2684 DG |
3068 | { |
3069 | int ret; | |
3070 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3071 | struct ltt_ust_session *usess = session->ust_session; | |
3072 | ||
3073 | assert(session); | |
3074 | ||
3075 | /* Session MUST be stopped to ask for data availability. */ | |
8382cf6f | 3076 | if (session->active) { |
806e2684 DG |
3077 | ret = LTTNG_ERR_SESSION_STARTED; |
3078 | goto error; | |
3a89d11a DG |
3079 | } else { |
3080 | /* | |
3081 | * If stopped, just make sure we've started before else the above call | |
3082 | * will always send that there is data pending. | |
3083 | * | |
3084 | * The consumer assumes that when the data pending command is received, | |
3085 | * the trace has been started before or else no output data is written | |
3086 | * by the streams which is a condition for data pending. So, this is | |
3087 | * *VERY* important that we don't ask the consumer before a start | |
3088 | * trace. | |
3089 | */ | |
8382cf6f | 3090 | if (!session->has_been_started) { |
3a89d11a DG |
3091 | ret = 0; |
3092 | goto error; | |
3093 | } | |
806e2684 DG |
3094 | } |
3095 | ||
3096 | if (ksess && ksess->consumer) { | |
6d805429 DG |
3097 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
3098 | if (ret == 1) { | |
806e2684 DG |
3099 | /* Data is still being extracted for the kernel. */ |
3100 | goto error; | |
3101 | } | |
3102 | } | |
3103 | ||
3104 | if (usess && usess->consumer) { | |
6d805429 DG |
3105 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
3106 | if (ret == 1) { | |
806e2684 DG |
3107 | /* Data is still being extracted for the kernel. */ |
3108 | goto error; | |
3109 | } | |
3110 | } | |
3111 | ||
3112 | /* Data is ready to be read by a viewer */ | |
6d805429 | 3113 | ret = 0; |
806e2684 DG |
3114 | |
3115 | error: | |
3116 | return ret; | |
3117 | } | |
3118 | ||
6dc3064a DG |
3119 | /* |
3120 | * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library. | |
3121 | * | |
3122 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3123 | */ | |
3124 | int cmd_snapshot_add_output(struct ltt_session *session, | |
3125 | struct lttng_snapshot_output *output, uint32_t *id) | |
3126 | { | |
3127 | int ret; | |
3128 | struct snapshot_output *new_output; | |
3129 | ||
3130 | assert(session); | |
3131 | assert(output); | |
3132 | ||
3133 | DBG("Cmd snapshot add output for session %s", session->name); | |
3134 | ||
3135 | /* | |
903ef685 | 3136 | * Can't create an output if the session is not set in no-output mode. |
6dc3064a DG |
3137 | */ |
3138 | if (session->output_traces) { | |
903ef685 | 3139 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3140 | goto error; |
3141 | } | |
3142 | ||
3143 | /* Only one output is allowed until we have the "tee" feature. */ | |
3144 | if (session->snapshot.nb_output == 1) { | |
3145 | ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST; | |
3146 | goto error; | |
3147 | } | |
3148 | ||
3149 | new_output = snapshot_output_alloc(); | |
3150 | if (!new_output) { | |
3151 | ret = LTTNG_ERR_NOMEM; | |
3152 | goto error; | |
3153 | } | |
3154 | ||
3155 | ret = snapshot_output_init(output->max_size, output->name, | |
3156 | output->ctrl_url, output->data_url, session->consumer, new_output, | |
3157 | &session->snapshot); | |
3158 | if (ret < 0) { | |
3159 | if (ret == -ENOMEM) { | |
3160 | ret = LTTNG_ERR_NOMEM; | |
3161 | } else { | |
3162 | ret = LTTNG_ERR_INVALID; | |
3163 | } | |
3164 | goto free_error; | |
3165 | } | |
3166 | ||
6dc3064a DG |
3167 | rcu_read_lock(); |
3168 | snapshot_add_output(&session->snapshot, new_output); | |
3169 | if (id) { | |
3170 | *id = new_output->id; | |
3171 | } | |
3172 | rcu_read_unlock(); | |
3173 | ||
3174 | return LTTNG_OK; | |
3175 | ||
3176 | free_error: | |
3177 | snapshot_output_destroy(new_output); | |
3178 | error: | |
3179 | return ret; | |
3180 | } | |
3181 | ||
3182 | /* | |
3183 | * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl. | |
3184 | * | |
3185 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3186 | */ | |
3187 | int cmd_snapshot_del_output(struct ltt_session *session, | |
3188 | struct lttng_snapshot_output *output) | |
3189 | { | |
3190 | int ret; | |
eb240553 | 3191 | struct snapshot_output *sout = NULL; |
6dc3064a DG |
3192 | |
3193 | assert(session); | |
3194 | assert(output); | |
3195 | ||
6dc3064a DG |
3196 | rcu_read_lock(); |
3197 | ||
3198 | /* | |
d3f14b8a MD |
3199 | * Permission denied to create an output if the session is not |
3200 | * set in no output mode. | |
6dc3064a DG |
3201 | */ |
3202 | if (session->output_traces) { | |
903ef685 | 3203 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3204 | goto error; |
3205 | } | |
3206 | ||
eb240553 DG |
3207 | if (output->id) { |
3208 | DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id, | |
3209 | session->name); | |
3210 | sout = snapshot_find_output_by_id(output->id, &session->snapshot); | |
3211 | } else if (*output->name != '\0') { | |
3212 | DBG("Cmd snapshot del output name %s for session %s", output->name, | |
3213 | session->name); | |
3214 | sout = snapshot_find_output_by_name(output->name, &session->snapshot); | |
3215 | } | |
6dc3064a DG |
3216 | if (!sout) { |
3217 | ret = LTTNG_ERR_INVALID; | |
3218 | goto error; | |
3219 | } | |
3220 | ||
3221 | snapshot_delete_output(&session->snapshot, sout); | |
3222 | snapshot_output_destroy(sout); | |
3223 | ret = LTTNG_OK; | |
3224 | ||
3225 | error: | |
3226 | rcu_read_unlock(); | |
3227 | return ret; | |
3228 | } | |
3229 | ||
3230 | /* | |
3231 | * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl. | |
3232 | * | |
3233 | * If no output is available, outputs is untouched and 0 is returned. | |
3234 | * | |
3235 | * Return the size of the newly allocated outputs or a negative LTTNG_ERR code. | |
3236 | */ | |
3237 | ssize_t cmd_snapshot_list_outputs(struct ltt_session *session, | |
3238 | struct lttng_snapshot_output **outputs) | |
3239 | { | |
3240 | int ret, idx = 0; | |
b223ca94 | 3241 | struct lttng_snapshot_output *list = NULL; |
6dc3064a DG |
3242 | struct lttng_ht_iter iter; |
3243 | struct snapshot_output *output; | |
3244 | ||
3245 | assert(session); | |
3246 | assert(outputs); | |
3247 | ||
3248 | DBG("Cmd snapshot list outputs for session %s", session->name); | |
3249 | ||
3250 | /* | |
d3f14b8a MD |
3251 | * Permission denied to create an output if the session is not |
3252 | * set in no output mode. | |
6dc3064a DG |
3253 | */ |
3254 | if (session->output_traces) { | |
903ef685 JG |
3255 | ret = -LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
3256 | goto end; | |
6dc3064a DG |
3257 | } |
3258 | ||
3259 | if (session->snapshot.nb_output == 0) { | |
3260 | ret = 0; | |
903ef685 | 3261 | goto end; |
6dc3064a DG |
3262 | } |
3263 | ||
3264 | list = zmalloc(session->snapshot.nb_output * sizeof(*list)); | |
3265 | if (!list) { | |
b223ca94 | 3266 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3267 | goto end; |
6dc3064a DG |
3268 | } |
3269 | ||
3270 | /* Copy list from session to the new list object. */ | |
b223ca94 | 3271 | rcu_read_lock(); |
6dc3064a DG |
3272 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter, |
3273 | output, node.node) { | |
3274 | assert(output->consumer); | |
3275 | list[idx].id = output->id; | |
3276 | list[idx].max_size = output->max_size; | |
6ce22875 MD |
3277 | if (lttng_strncpy(list[idx].name, output->name, |
3278 | sizeof(list[idx].name))) { | |
3279 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 3280 | goto error; |
6ce22875 | 3281 | } |
6dc3064a | 3282 | if (output->consumer->type == CONSUMER_DST_LOCAL) { |
6ce22875 MD |
3283 | if (lttng_strncpy(list[idx].ctrl_url, |
3284 | output->consumer->dst.trace_path, | |
3285 | sizeof(list[idx].ctrl_url))) { | |
3286 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 3287 | goto error; |
6ce22875 | 3288 | } |
6dc3064a DG |
3289 | } else { |
3290 | /* Control URI. */ | |
3291 | ret = uri_to_str_url(&output->consumer->dst.net.control, | |
3292 | list[idx].ctrl_url, sizeof(list[idx].ctrl_url)); | |
3293 | if (ret < 0) { | |
b223ca94 | 3294 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3295 | goto error; |
6dc3064a DG |
3296 | } |
3297 | ||
3298 | /* Data URI. */ | |
3299 | ret = uri_to_str_url(&output->consumer->dst.net.data, | |
3300 | list[idx].data_url, sizeof(list[idx].data_url)); | |
3301 | if (ret < 0) { | |
b223ca94 | 3302 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3303 | goto error; |
6dc3064a DG |
3304 | } |
3305 | } | |
3306 | idx++; | |
3307 | } | |
3308 | ||
3309 | *outputs = list; | |
b223ca94 JG |
3310 | list = NULL; |
3311 | ret = session->snapshot.nb_output; | |
6dc3064a | 3312 | error: |
903ef685 | 3313 | rcu_read_unlock(); |
b223ca94 | 3314 | free(list); |
903ef685 | 3315 | end: |
b223ca94 | 3316 | return ret; |
6dc3064a DG |
3317 | } |
3318 | ||
93ec662e JD |
3319 | /* |
3320 | * Check if we can regenerate the metadata for this session. | |
3321 | * Only kernel, UST per-uid and non-live sessions are supported. | |
3322 | * | |
3323 | * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise. | |
3324 | */ | |
3325 | static | |
eded6438 | 3326 | int check_regenerate_metadata_support(struct ltt_session *session) |
93ec662e JD |
3327 | { |
3328 | int ret; | |
3329 | ||
3330 | assert(session); | |
3331 | ||
3332 | if (session->live_timer != 0) { | |
3333 | ret = LTTNG_ERR_LIVE_SESSION; | |
3334 | goto end; | |
3335 | } | |
3336 | if (!session->active) { | |
3337 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
3338 | goto end; | |
3339 | } | |
3340 | if (session->ust_session) { | |
3341 | switch (session->ust_session->buffer_type) { | |
3342 | case LTTNG_BUFFER_PER_UID: | |
3343 | break; | |
3344 | case LTTNG_BUFFER_PER_PID: | |
3345 | ret = LTTNG_ERR_PER_PID_SESSION; | |
3346 | goto end; | |
3347 | default: | |
3348 | assert(0); | |
3349 | ret = LTTNG_ERR_UNK; | |
3350 | goto end; | |
3351 | } | |
3352 | } | |
3353 | if (session->consumer->type == CONSUMER_DST_NET && | |
3354 | session->consumer->relay_minor_version < 8) { | |
3355 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; | |
3356 | goto end; | |
3357 | } | |
3358 | ret = 0; | |
3359 | ||
3360 | end: | |
3361 | return ret; | |
3362 | } | |
3363 | ||
7802bae3 LL |
3364 | static |
3365 | int clear_metadata_file(int fd) | |
3366 | { | |
3367 | int ret; | |
3368 | ||
3369 | ret = lseek(fd, 0, SEEK_SET); | |
3370 | if (ret < 0) { | |
3371 | PERROR("lseek"); | |
3372 | goto end; | |
3373 | } | |
3374 | ||
3375 | ret = ftruncate(fd, 0); | |
3376 | if (ret < 0) { | |
3377 | PERROR("ftruncate"); | |
3378 | goto end; | |
3379 | } | |
3380 | ||
3381 | end: | |
3382 | return ret; | |
3383 | } | |
3384 | ||
93ec662e | 3385 | static |
eded6438 | 3386 | int ust_regenerate_metadata(struct ltt_ust_session *usess) |
93ec662e JD |
3387 | { |
3388 | int ret = 0; | |
3389 | struct buffer_reg_uid *uid_reg = NULL; | |
3390 | struct buffer_reg_session *session_reg = NULL; | |
3391 | ||
3392 | rcu_read_lock(); | |
3393 | cds_list_for_each_entry(uid_reg, &usess->buffer_reg_uid_list, lnode) { | |
3394 | struct ust_registry_session *registry; | |
3395 | struct ust_registry_channel *chan; | |
3396 | struct lttng_ht_iter iter_chan; | |
3397 | ||
3398 | session_reg = uid_reg->registry; | |
3399 | registry = session_reg->reg.ust; | |
3400 | ||
3401 | pthread_mutex_lock(®istry->lock); | |
3402 | registry->metadata_len_sent = 0; | |
3403 | memset(registry->metadata, 0, registry->metadata_alloc_len); | |
3404 | registry->metadata_len = 0; | |
3405 | registry->metadata_version++; | |
7802bae3 LL |
3406 | if (registry->metadata_fd > 0) { |
3407 | /* Clear the metadata file's content. */ | |
3408 | ret = clear_metadata_file(registry->metadata_fd); | |
3409 | if (ret) { | |
3410 | pthread_mutex_unlock(®istry->lock); | |
3411 | goto end; | |
3412 | } | |
3413 | } | |
3414 | ||
93ec662e JD |
3415 | ret = ust_metadata_session_statedump(registry, NULL, |
3416 | registry->major, registry->minor); | |
3417 | if (ret) { | |
3418 | pthread_mutex_unlock(®istry->lock); | |
3419 | ERR("Failed to generate session metadata (err = %d)", | |
3420 | ret); | |
3421 | goto end; | |
3422 | } | |
3423 | cds_lfht_for_each_entry(registry->channels->ht, &iter_chan.iter, | |
3424 | chan, node.node) { | |
3425 | struct ust_registry_event *event; | |
3426 | struct lttng_ht_iter iter_event; | |
3427 | ||
3428 | ret = ust_metadata_channel_statedump(registry, chan); | |
3429 | if (ret) { | |
3430 | pthread_mutex_unlock(®istry->lock); | |
3431 | ERR("Failed to generate channel metadata " | |
3432 | "(err = %d)", ret); | |
3433 | goto end; | |
3434 | } | |
3435 | cds_lfht_for_each_entry(chan->ht->ht, &iter_event.iter, | |
3436 | event, node.node) { | |
3437 | ret = ust_metadata_event_statedump(registry, | |
3438 | chan, event); | |
3439 | if (ret) { | |
3440 | pthread_mutex_unlock(®istry->lock); | |
3441 | ERR("Failed to generate event metadata " | |
3442 | "(err = %d)", ret); | |
3443 | goto end; | |
3444 | } | |
3445 | } | |
3446 | } | |
3447 | pthread_mutex_unlock(®istry->lock); | |
3448 | } | |
3449 | ||
3450 | end: | |
3451 | rcu_read_unlock(); | |
3452 | return ret; | |
3453 | } | |
3454 | ||
3455 | /* | |
eded6438 | 3456 | * Command LTTNG_REGENERATE_METADATA from the lttng-ctl library. |
93ec662e JD |
3457 | * |
3458 | * Ask the consumer to truncate the existing metadata file(s) and | |
3459 | * then regenerate the metadata. Live and per-pid sessions are not | |
3460 | * supported and return an error. | |
3461 | * | |
3462 | * Return 0 on success or else a LTTNG_ERR code. | |
3463 | */ | |
eded6438 | 3464 | int cmd_regenerate_metadata(struct ltt_session *session) |
93ec662e JD |
3465 | { |
3466 | int ret; | |
3467 | ||
3468 | assert(session); | |
3469 | ||
eded6438 | 3470 | ret = check_regenerate_metadata_support(session); |
93ec662e JD |
3471 | if (ret) { |
3472 | goto end; | |
3473 | } | |
3474 | ||
3475 | if (session->kernel_session) { | |
eded6438 | 3476 | ret = kernctl_session_regenerate_metadata( |
93ec662e JD |
3477 | session->kernel_session->fd); |
3478 | if (ret < 0) { | |
3479 | ERR("Failed to regenerate the kernel metadata"); | |
3480 | goto end; | |
3481 | } | |
3482 | } | |
3483 | ||
3484 | if (session->ust_session) { | |
eded6438 | 3485 | ret = ust_regenerate_metadata(session->ust_session); |
93ec662e JD |
3486 | if (ret < 0) { |
3487 | ERR("Failed to regenerate the UST metadata"); | |
3488 | goto end; | |
3489 | } | |
3490 | } | |
3491 | DBG("Cmd metadata regenerate for session %s", session->name); | |
3492 | ret = LTTNG_OK; | |
3493 | ||
3494 | end: | |
3495 | return ret; | |
3496 | } | |
3497 | ||
c2561365 JD |
3498 | /* |
3499 | * Command LTTNG_REGENERATE_STATEDUMP from the lttng-ctl library. | |
3500 | * | |
3501 | * Ask the tracer to regenerate a new statedump. | |
3502 | * | |
3503 | * Return 0 on success or else a LTTNG_ERR code. | |
3504 | */ | |
3505 | int cmd_regenerate_statedump(struct ltt_session *session) | |
3506 | { | |
3507 | int ret; | |
3508 | ||
3509 | assert(session); | |
3510 | ||
3511 | if (!session->active) { | |
3512 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
3513 | goto end; | |
3514 | } | |
3515 | ret = 0; | |
3516 | ||
3517 | if (session->kernel_session) { | |
3518 | ret = kernctl_session_regenerate_statedump( | |
3519 | session->kernel_session->fd); | |
3520 | /* | |
3521 | * Currently, the statedump in kernel can only fail if out | |
3522 | * of memory. | |
3523 | */ | |
3524 | if (ret < 0) { | |
3525 | if (ret == -ENOMEM) { | |
3526 | ret = LTTNG_ERR_REGEN_STATEDUMP_NOMEM; | |
3527 | } else { | |
3528 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
3529 | } | |
3530 | ERR("Failed to regenerate the kernel statedump"); | |
3531 | goto end; | |
3532 | } | |
3533 | } | |
3534 | ||
3535 | if (session->ust_session) { | |
3536 | ret = ust_app_regenerate_statedump_all(session->ust_session); | |
3537 | /* | |
3538 | * Currently, the statedump in UST always returns 0. | |
3539 | */ | |
3540 | if (ret < 0) { | |
3541 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
3542 | ERR("Failed to regenerate the UST statedump"); | |
3543 | goto end; | |
3544 | } | |
3545 | } | |
3546 | DBG("Cmd regenerate statedump for session %s", session->name); | |
3547 | ret = LTTNG_OK; | |
3548 | ||
3549 | end: | |
3550 | return ret; | |
3551 | } | |
3552 | ||
b0880ae5 JG |
3553 | int cmd_register_trigger(struct command_ctx *cmd_ctx, int sock, |
3554 | struct notification_thread_handle *notification_thread) | |
3555 | { | |
3556 | int ret; | |
3557 | size_t trigger_len; | |
3558 | ssize_t sock_recv_len; | |
3559 | struct lttng_trigger *trigger = NULL; | |
3560 | struct lttng_buffer_view view; | |
3561 | struct lttng_dynamic_buffer trigger_buffer; | |
3562 | ||
3563 | lttng_dynamic_buffer_init(&trigger_buffer); | |
3564 | trigger_len = (size_t) cmd_ctx->lsm->u.trigger.length; | |
3565 | ret = lttng_dynamic_buffer_set_size(&trigger_buffer, trigger_len); | |
3566 | if (ret) { | |
3567 | ret = LTTNG_ERR_NOMEM; | |
3568 | goto end; | |
3569 | } | |
3570 | ||
3571 | sock_recv_len = lttcomm_recv_unix_sock(sock, trigger_buffer.data, | |
3572 | trigger_len); | |
3573 | if (sock_recv_len < 0 || sock_recv_len != trigger_len) { | |
3574 | ERR("Failed to receive \"register trigger\" command payload"); | |
3575 | /* TODO: should this be a new error enum ? */ | |
3576 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
3577 | goto end; | |
3578 | } | |
3579 | ||
3580 | view = lttng_buffer_view_from_dynamic_buffer(&trigger_buffer, 0, -1); | |
3581 | if (lttng_trigger_create_from_buffer(&view, &trigger) != | |
3582 | trigger_len) { | |
3583 | ERR("Invalid trigger payload received in \"register trigger\" command"); | |
3584 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
3585 | goto end; | |
3586 | } | |
3587 | ||
3588 | ret = notification_thread_command_register_trigger(notification_thread, | |
3589 | trigger); | |
587f9fd0 JG |
3590 | /* Ownership of trigger was transferred. */ |
3591 | trigger = NULL; | |
b0880ae5 | 3592 | end: |
587f9fd0 | 3593 | lttng_trigger_destroy(trigger); |
b0880ae5 JG |
3594 | lttng_dynamic_buffer_reset(&trigger_buffer); |
3595 | return ret; | |
3596 | } | |
3597 | ||
3598 | int cmd_unregister_trigger(struct command_ctx *cmd_ctx, int sock, | |
3599 | struct notification_thread_handle *notification_thread) | |
3600 | { | |
3601 | int ret; | |
3602 | size_t trigger_len; | |
3603 | ssize_t sock_recv_len; | |
3604 | struct lttng_trigger *trigger = NULL; | |
3605 | struct lttng_buffer_view view; | |
3606 | struct lttng_dynamic_buffer trigger_buffer; | |
3607 | ||
3608 | lttng_dynamic_buffer_init(&trigger_buffer); | |
3609 | trigger_len = (size_t) cmd_ctx->lsm->u.trigger.length; | |
3610 | ret = lttng_dynamic_buffer_set_size(&trigger_buffer, trigger_len); | |
3611 | if (ret) { | |
3612 | ret = LTTNG_ERR_NOMEM; | |
3613 | goto end; | |
3614 | } | |
3615 | ||
3616 | sock_recv_len = lttcomm_recv_unix_sock(sock, trigger_buffer.data, | |
3617 | trigger_len); | |
3618 | if (sock_recv_len < 0 || sock_recv_len != trigger_len) { | |
3619 | ERR("Failed to receive \"unregister trigger\" command payload"); | |
3620 | /* TODO: should this be a new error enum ? */ | |
3621 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
3622 | goto end; | |
3623 | } | |
3624 | ||
3625 | view = lttng_buffer_view_from_dynamic_buffer(&trigger_buffer, 0, -1); | |
3626 | if (lttng_trigger_create_from_buffer(&view, &trigger) != | |
3627 | trigger_len) { | |
3628 | ERR("Invalid trigger payload received in \"unregister trigger\" command"); | |
3629 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
3630 | goto end; | |
3631 | } | |
3632 | ||
3633 | ret = notification_thread_command_unregister_trigger(notification_thread, | |
3634 | trigger); | |
3635 | end: | |
587f9fd0 | 3636 | lttng_trigger_destroy(trigger); |
b0880ae5 JG |
3637 | lttng_dynamic_buffer_reset(&trigger_buffer); |
3638 | return ret; | |
3639 | } | |
3640 | ||
6dc3064a DG |
3641 | /* |
3642 | * Send relayd sockets from snapshot output to consumer. Ignore request if the | |
3643 | * snapshot output is *not* set with a remote destination. | |
3644 | * | |
a934f4af | 3645 | * Return 0 on success or a LTTNG_ERR code. |
6dc3064a DG |
3646 | */ |
3647 | static int set_relayd_for_snapshot(struct consumer_output *consumer, | |
3648 | struct snapshot_output *snap_output, struct ltt_session *session) | |
3649 | { | |
a934f4af | 3650 | int ret = LTTNG_OK; |
6dc3064a DG |
3651 | struct lttng_ht_iter iter; |
3652 | struct consumer_socket *socket; | |
3653 | ||
3654 | assert(consumer); | |
3655 | assert(snap_output); | |
3656 | assert(session); | |
3657 | ||
3658 | DBG2("Set relayd object from snapshot output"); | |
3659 | ||
3660 | /* Ignore if snapshot consumer output is not network. */ | |
3661 | if (snap_output->consumer->type != CONSUMER_DST_NET) { | |
3662 | goto error; | |
3663 | } | |
3664 | ||
3665 | /* | |
3666 | * For each consumer socket, create and send the relayd object of the | |
3667 | * snapshot output. | |
3668 | */ | |
3669 | rcu_read_lock(); | |
5eecee74 DG |
3670 | cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter, |
3671 | socket, node.node) { | |
6dc3064a | 3672 | ret = send_consumer_relayd_sockets(0, session->id, |
d3e2ba59 JD |
3673 | snap_output->consumer, socket, |
3674 | session->name, session->hostname, | |
3675 | session->live_timer); | |
a934f4af | 3676 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3677 | rcu_read_unlock(); |
3678 | goto error; | |
3679 | } | |
3680 | } | |
3681 | rcu_read_unlock(); | |
3682 | ||
3683 | error: | |
3684 | return ret; | |
3685 | } | |
3686 | ||
3687 | /* | |
3688 | * Record a kernel snapshot. | |
3689 | * | |
fac41e72 | 3690 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a DG |
3691 | */ |
3692 | static int record_kernel_snapshot(struct ltt_kernel_session *ksess, | |
5c786ded | 3693 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3694 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3695 | { |
3696 | int ret; | |
3697 | ||
3698 | assert(ksess); | |
3699 | assert(output); | |
3700 | assert(session); | |
3701 | ||
10a50311 | 3702 | |
af706bb7 DG |
3703 | /* |
3704 | * Copy kernel session sockets so we can communicate with the right | |
3705 | * consumer for the snapshot record command. | |
3706 | */ | |
3707 | ret = consumer_copy_sockets(output->consumer, ksess->consumer); | |
3708 | if (ret < 0) { | |
a934f4af | 3709 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3710 | goto error; |
6dc3064a DG |
3711 | } |
3712 | ||
3713 | ret = set_relayd_for_snapshot(ksess->consumer, output, session); | |
a934f4af | 3714 | if (ret != LTTNG_OK) { |
af706bb7 | 3715 | goto error_snapshot; |
6dc3064a DG |
3716 | } |
3717 | ||
d07ceecd | 3718 | ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream); |
2a06df8d | 3719 | if (ret != LTTNG_OK) { |
af706bb7 | 3720 | goto error_snapshot; |
6dc3064a DG |
3721 | } |
3722 | ||
a934f4af | 3723 | ret = LTTNG_OK; |
1371fc12 | 3724 | goto end; |
a934f4af | 3725 | |
af706bb7 DG |
3726 | error_snapshot: |
3727 | /* Clean up copied sockets so this output can use some other later on. */ | |
3728 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a | 3729 | error: |
1371fc12 | 3730 | end: |
6dc3064a DG |
3731 | return ret; |
3732 | } | |
3733 | ||
3734 | /* | |
3735 | * Record a UST snapshot. | |
3736 | * | |
a934f4af | 3737 | * Return 0 on success or a LTTNG_ERR error code. |
6dc3064a DG |
3738 | */ |
3739 | static int record_ust_snapshot(struct ltt_ust_session *usess, | |
5c786ded | 3740 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3741 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3742 | { |
3743 | int ret; | |
3744 | ||
3745 | assert(usess); | |
3746 | assert(output); | |
3747 | assert(session); | |
3748 | ||
af706bb7 | 3749 | /* |
d3f14b8a | 3750 | * Copy UST session sockets so we can communicate with the right |
af706bb7 DG |
3751 | * consumer for the snapshot record command. |
3752 | */ | |
3753 | ret = consumer_copy_sockets(output->consumer, usess->consumer); | |
3754 | if (ret < 0) { | |
a934f4af | 3755 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3756 | goto error; |
6dc3064a DG |
3757 | } |
3758 | ||
3759 | ret = set_relayd_for_snapshot(usess->consumer, output, session); | |
a934f4af | 3760 | if (ret != LTTNG_OK) { |
af706bb7 | 3761 | goto error_snapshot; |
6dc3064a DG |
3762 | } |
3763 | ||
d07ceecd | 3764 | ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream); |
6dc3064a | 3765 | if (ret < 0) { |
7badf927 DG |
3766 | switch (-ret) { |
3767 | case EINVAL: | |
a934f4af | 3768 | ret = LTTNG_ERR_INVALID; |
7badf927 | 3769 | break; |
7badf927 DG |
3770 | default: |
3771 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
3772 | break; | |
5c786ded | 3773 | } |
af706bb7 | 3774 | goto error_snapshot; |
6dc3064a DG |
3775 | } |
3776 | ||
a934f4af DG |
3777 | ret = LTTNG_OK; |
3778 | ||
af706bb7 DG |
3779 | error_snapshot: |
3780 | /* Clean up copied sockets so this output can use some other later on. */ | |
3781 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a DG |
3782 | error: |
3783 | return ret; | |
3784 | } | |
3785 | ||
d07ceecd MD |
3786 | static |
3787 | uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session, | |
3788 | uint64_t cur_nr_packets) | |
68808f4e | 3789 | { |
d07ceecd | 3790 | uint64_t tot_size = 0; |
68808f4e DG |
3791 | |
3792 | if (session->kernel_session) { | |
3793 | struct ltt_kernel_channel *chan; | |
3794 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3795 | ||
68808f4e | 3796 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
d07ceecd MD |
3797 | if (cur_nr_packets >= chan->channel->attr.num_subbuf) { |
3798 | /* | |
3799 | * Don't take channel into account if we | |
3800 | * already grab all its packets. | |
3801 | */ | |
3802 | continue; | |
68808f4e | 3803 | } |
d07ceecd MD |
3804 | tot_size += chan->channel->attr.subbuf_size |
3805 | * chan->stream_count; | |
68808f4e DG |
3806 | } |
3807 | } | |
3808 | ||
3809 | if (session->ust_session) { | |
68808f4e DG |
3810 | struct ltt_ust_session *usess = session->ust_session; |
3811 | ||
d07ceecd MD |
3812 | tot_size += ust_app_get_size_one_more_packet_per_stream(usess, |
3813 | cur_nr_packets); | |
68808f4e DG |
3814 | } |
3815 | ||
d07ceecd | 3816 | return tot_size; |
68808f4e DG |
3817 | } |
3818 | ||
5c786ded | 3819 | /* |
d07ceecd MD |
3820 | * Calculate the number of packets we can grab from each stream that |
3821 | * fits within the overall snapshot max size. | |
3822 | * | |
3823 | * Returns -1 on error, 0 means infinite number of packets, else > 0 is | |
3824 | * the number of packets per stream. | |
3825 | * | |
3826 | * TODO: this approach is not perfect: we consider the worse case | |
3827 | * (packet filling the sub-buffers) as an upper bound, but we could do | |
3828 | * better if we do this calculation while we actually grab the packet | |
3829 | * content: we would know how much padding we don't actually store into | |
3830 | * the file. | |
3831 | * | |
3832 | * This algorithm is currently bounded by the number of packets per | |
3833 | * stream. | |
3834 | * | |
3835 | * Since we call this algorithm before actually grabbing the data, it's | |
3836 | * an approximation: for instance, applications could appear/disappear | |
3837 | * in between this call and actually grabbing data. | |
5c786ded | 3838 | */ |
d07ceecd MD |
3839 | static |
3840 | int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size) | |
5c786ded | 3841 | { |
d07ceecd MD |
3842 | int64_t size_left; |
3843 | uint64_t cur_nb_packets = 0; | |
5c786ded | 3844 | |
d07ceecd MD |
3845 | if (!max_size) { |
3846 | return 0; /* Infinite */ | |
5c786ded JD |
3847 | } |
3848 | ||
d07ceecd MD |
3849 | size_left = max_size; |
3850 | for (;;) { | |
3851 | uint64_t one_more_packet_tot_size; | |
5c786ded | 3852 | |
d07ceecd MD |
3853 | one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session, |
3854 | cur_nb_packets); | |
3855 | if (!one_more_packet_tot_size) { | |
3856 | /* We are already grabbing all packets. */ | |
3857 | break; | |
3858 | } | |
3859 | size_left -= one_more_packet_tot_size; | |
3860 | if (size_left < 0) { | |
3861 | break; | |
3862 | } | |
3863 | cur_nb_packets++; | |
5c786ded | 3864 | } |
d07ceecd MD |
3865 | if (!cur_nb_packets) { |
3866 | /* Not enough room to grab one packet of each stream, error. */ | |
3867 | return -1; | |
3868 | } | |
3869 | return cur_nb_packets; | |
5c786ded JD |
3870 | } |
3871 | ||
6dc3064a DG |
3872 | /* |
3873 | * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl. | |
3874 | * | |
3875 | * The wait parameter is ignored so this call always wait for the snapshot to | |
3876 | * complete before returning. | |
3877 | * | |
3878 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3879 | */ | |
3880 | int cmd_snapshot_record(struct ltt_session *session, | |
3881 | struct lttng_snapshot_output *output, int wait) | |
3882 | { | |
3883 | int ret = LTTNG_OK; | |
e1986656 DG |
3884 | unsigned int use_tmp_output = 0; |
3885 | struct snapshot_output tmp_output; | |
00e1dfc4 | 3886 | unsigned int snapshot_success = 0; |
10ba83fe | 3887 | char datetime[16]; |
6dc3064a DG |
3888 | |
3889 | assert(session); | |
ba45d9f0 | 3890 | assert(output); |
6dc3064a DG |
3891 | |
3892 | DBG("Cmd snapshot record for session %s", session->name); | |
3893 | ||
10ba83fe JR |
3894 | /* Get the datetime for the snapshot output directory. */ |
3895 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", datetime, | |
3896 | sizeof(datetime)); | |
3897 | if (!ret) { | |
3898 | ret = LTTNG_ERR_INVALID; | |
3899 | goto error; | |
3900 | } | |
3901 | ||
6dc3064a | 3902 | /* |
d3f14b8a MD |
3903 | * Permission denied to create an output if the session is not |
3904 | * set in no output mode. | |
6dc3064a DG |
3905 | */ |
3906 | if (session->output_traces) { | |
903ef685 | 3907 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3908 | goto error; |
3909 | } | |
3910 | ||
3911 | /* The session needs to be started at least once. */ | |
8382cf6f | 3912 | if (!session->has_been_started) { |
6dc3064a DG |
3913 | ret = LTTNG_ERR_START_SESSION_ONCE; |
3914 | goto error; | |
3915 | } | |
3916 | ||
3917 | /* Use temporary output for the session. */ | |
ba45d9f0 | 3918 | if (*output->ctrl_url != '\0') { |
6dc3064a DG |
3919 | ret = snapshot_output_init(output->max_size, output->name, |
3920 | output->ctrl_url, output->data_url, session->consumer, | |
e1986656 | 3921 | &tmp_output, NULL); |
6dc3064a DG |
3922 | if (ret < 0) { |
3923 | if (ret == -ENOMEM) { | |
3924 | ret = LTTNG_ERR_NOMEM; | |
3925 | } else { | |
3926 | ret = LTTNG_ERR_INVALID; | |
3927 | } | |
3928 | goto error; | |
3929 | } | |
1bfe7328 DG |
3930 | /* Use the global session count for the temporary snapshot. */ |
3931 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; | |
10ba83fe JR |
3932 | |
3933 | /* Use the global datetime */ | |
3934 | memcpy(tmp_output.datetime, datetime, sizeof(datetime)); | |
e1986656 | 3935 | use_tmp_output = 1; |
6dc3064a DG |
3936 | } |
3937 | ||
804c90a8 JR |
3938 | if (use_tmp_output) { |
3939 | int64_t nb_packets_per_stream; | |
6dc3064a | 3940 | |
804c90a8 JR |
3941 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, |
3942 | tmp_output.max_size); | |
3943 | if (nb_packets_per_stream < 0) { | |
3944 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
3945 | goto error; | |
3946 | } | |
d07ceecd | 3947 | |
804c90a8 JR |
3948 | if (session->kernel_session) { |
3949 | ret = record_kernel_snapshot(session->kernel_session, | |
3950 | &tmp_output, session, | |
3951 | wait, nb_packets_per_stream); | |
3952 | if (ret != LTTNG_OK) { | |
d07ceecd MD |
3953 | goto error; |
3954 | } | |
804c90a8 JR |
3955 | } |
3956 | ||
3957 | if (session->ust_session) { | |
3958 | ret = record_ust_snapshot(session->ust_session, | |
3959 | &tmp_output, session, | |
d07ceecd | 3960 | wait, nb_packets_per_stream); |
a934f4af | 3961 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3962 | goto error; |
3963 | } | |
804c90a8 | 3964 | } |
e1986656 | 3965 | |
804c90a8 JR |
3966 | snapshot_success = 1; |
3967 | } else { | |
3968 | struct snapshot_output *sout; | |
3969 | struct lttng_ht_iter iter; | |
68808f4e | 3970 | |
804c90a8 JR |
3971 | rcu_read_lock(); |
3972 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
3973 | &iter.iter, sout, node.node) { | |
3974 | int64_t nb_packets_per_stream; | |
e1986656 | 3975 | |
804c90a8 JR |
3976 | /* |
3977 | * Make a local copy of the output and assign the possible | |
3978 | * temporary value given by the caller. | |
3979 | */ | |
3980 | memset(&tmp_output, 0, sizeof(tmp_output)); | |
3981 | memcpy(&tmp_output, sout, sizeof(tmp_output)); | |
1bfe7328 | 3982 | |
804c90a8 JR |
3983 | if (output->max_size != (uint64_t) -1ULL) { |
3984 | tmp_output.max_size = output->max_size; | |
6dc3064a | 3985 | } |
d07ceecd MD |
3986 | |
3987 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
3988 | tmp_output.max_size); | |
3989 | if (nb_packets_per_stream < 0) { | |
3990 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
804c90a8 | 3991 | rcu_read_unlock(); |
d07ceecd MD |
3992 | goto error; |
3993 | } | |
6dc3064a | 3994 | |
804c90a8 JR |
3995 | /* Use temporary name. */ |
3996 | if (*output->name != '\0') { | |
cf3e357d MD |
3997 | if (lttng_strncpy(tmp_output.name, output->name, |
3998 | sizeof(tmp_output.name))) { | |
3999 | ret = LTTNG_ERR_INVALID; | |
4000 | rcu_read_unlock(); | |
4001 | goto error; | |
4002 | } | |
804c90a8 | 4003 | } |
e1986656 | 4004 | |
804c90a8 | 4005 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; |
10ba83fe | 4006 | memcpy(tmp_output.datetime, datetime, sizeof(datetime)); |
e1986656 | 4007 | |
804c90a8 JR |
4008 | if (session->kernel_session) { |
4009 | ret = record_kernel_snapshot(session->kernel_session, | |
4010 | &tmp_output, session, | |
4011 | wait, nb_packets_per_stream); | |
4012 | if (ret != LTTNG_OK) { | |
d07ceecd | 4013 | rcu_read_unlock(); |
68808f4e DG |
4014 | goto error; |
4015 | } | |
804c90a8 | 4016 | } |
68808f4e | 4017 | |
804c90a8 JR |
4018 | if (session->ust_session) { |
4019 | ret = record_ust_snapshot(session->ust_session, | |
4020 | &tmp_output, session, | |
d07ceecd | 4021 | wait, nb_packets_per_stream); |
a934f4af | 4022 | if (ret != LTTNG_OK) { |
6dc3064a DG |
4023 | rcu_read_unlock(); |
4024 | goto error; | |
4025 | } | |
4026 | } | |
804c90a8 | 4027 | snapshot_success = 1; |
6dc3064a | 4028 | } |
804c90a8 | 4029 | rcu_read_unlock(); |
6dc3064a DG |
4030 | } |
4031 | ||
1bfe7328 DG |
4032 | if (snapshot_success) { |
4033 | session->snapshot.nb_snapshot++; | |
b67578cb MD |
4034 | } else { |
4035 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
1bfe7328 DG |
4036 | } |
4037 | ||
6dc3064a | 4038 | error: |
6dc3064a DG |
4039 | return ret; |
4040 | } | |
4041 | ||
d7ba1388 MD |
4042 | /* |
4043 | * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread. | |
4044 | */ | |
4045 | int cmd_set_session_shm_path(struct ltt_session *session, | |
4046 | const char *shm_path) | |
4047 | { | |
4048 | /* Safety net */ | |
4049 | assert(session); | |
4050 | ||
4051 | /* | |
4052 | * Can only set shm path before session is started. | |
4053 | */ | |
4054 | if (session->has_been_started) { | |
4055 | return LTTNG_ERR_SESSION_STARTED; | |
4056 | } | |
4057 | ||
4058 | strncpy(session->shm_path, shm_path, | |
4059 | sizeof(session->shm_path)); | |
4060 | session->shm_path[sizeof(session->shm_path) - 1] = '\0'; | |
4061 | ||
4062 | return 0; | |
4063 | } | |
4064 | ||
2f77fc4b DG |
4065 | /* |
4066 | * Init command subsystem. | |
4067 | */ | |
4068 | void cmd_init(void) | |
4069 | { | |
4070 | /* | |
d88aee68 DG |
4071 | * Set network sequence index to 1 for streams to match a relayd |
4072 | * socket on the consumer side. | |
2f77fc4b | 4073 | */ |
d88aee68 DG |
4074 | pthread_mutex_lock(&relayd_net_seq_idx_lock); |
4075 | relayd_net_seq_idx = 1; | |
4076 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
4077 | |
4078 | DBG("Command subsystem initialized"); | |
4079 | } |