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 | */ | |
d449df4a | 246 | static ssize_t 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 | { |
d449df4a | 250 | int i = 0, ret = 0; |
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; | |
491d1539 | 280 | chan_exts[i].blocking_timeout = 0; |
2f77fc4b DG |
281 | i++; |
282 | } | |
283 | } | |
284 | break; | |
285 | case LTTNG_DOMAIN_UST: | |
286 | { | |
287 | struct lttng_ht_iter iter; | |
288 | struct ltt_ust_channel *uchan; | |
289 | ||
e7fe706f | 290 | rcu_read_lock(); |
2f77fc4b DG |
291 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
292 | &iter.iter, uchan, node.node) { | |
a91c5803 | 293 | uint64_t discarded_events = 0, lost_packets = 0; |
fb83fe64 | 294 | |
8ee609c8 MD |
295 | if (lttng_strncpy(channels[i].name, uchan->name, |
296 | LTTNG_SYMBOL_NAME_LEN)) { | |
297 | break; | |
298 | } | |
2f77fc4b DG |
299 | channels[i].attr.overwrite = uchan->attr.overwrite; |
300 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
301 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
302 | channels[i].attr.switch_timer_interval = | |
303 | uchan->attr.switch_timer_interval; | |
304 | channels[i].attr.read_timer_interval = | |
305 | uchan->attr.read_timer_interval; | |
306 | channels[i].enabled = uchan->enabled; | |
2f785fe7 DG |
307 | channels[i].attr.tracefile_size = uchan->tracefile_size; |
308 | channels[i].attr.tracefile_count = uchan->tracefile_count; | |
5e4435a4 JG |
309 | |
310 | /* | |
311 | * Map enum lttng_ust_output to enum lttng_event_output. | |
312 | */ | |
2f77fc4b DG |
313 | switch (uchan->attr.output) { |
314 | case LTTNG_UST_MMAP: | |
2f77fc4b DG |
315 | channels[i].attr.output = LTTNG_EVENT_MMAP; |
316 | break; | |
5e4435a4 JG |
317 | default: |
318 | /* | |
319 | * LTTNG_UST_MMAP is the only supported UST | |
320 | * output mode. | |
321 | */ | |
322 | assert(0); | |
323 | break; | |
2f77fc4b | 324 | } |
fb83fe64 | 325 | |
d449df4a MD |
326 | chan_exts[i].monitor_timer_interval = |
327 | uchan->monitor_timer_interval; | |
491d1539 MD |
328 | chan_exts[i].blocking_timeout = |
329 | uchan->attr.u.s.blocking_timeout; | |
d449df4a | 330 | |
fb83fe64 JD |
331 | ret = get_ust_runtime_stats(session, uchan, |
332 | &discarded_events, &lost_packets); | |
333 | if (ret < 0) { | |
334 | break; | |
335 | } | |
336 | chan_exts[i].discarded_events = discarded_events; | |
337 | chan_exts[i].lost_packets = lost_packets; | |
2f77fc4b DG |
338 | i++; |
339 | } | |
e7fe706f | 340 | rcu_read_unlock(); |
2f77fc4b DG |
341 | break; |
342 | } | |
343 | default: | |
344 | break; | |
345 | } | |
fb83fe64 JD |
346 | |
347 | end: | |
d449df4a MD |
348 | if (ret < 0) { |
349 | return -LTTNG_ERR_FATAL; | |
350 | } else { | |
351 | return LTTNG_OK; | |
352 | } | |
2f77fc4b DG |
353 | } |
354 | ||
b4e3ceb9 | 355 | static void increment_extended_len(const char *filter_expression, |
795d57ce | 356 | struct lttng_event_exclusion *exclusion, size_t *extended_len) |
b4e3ceb9 PP |
357 | { |
358 | *extended_len += sizeof(struct lttcomm_event_extended_header); | |
359 | ||
360 | if (filter_expression) { | |
361 | *extended_len += strlen(filter_expression) + 1; | |
362 | } | |
795d57ce PP |
363 | |
364 | if (exclusion) { | |
365 | *extended_len += exclusion->count * LTTNG_SYMBOL_NAME_LEN; | |
366 | } | |
b4e3ceb9 PP |
367 | } |
368 | ||
369 | static void append_extended_info(const char *filter_expression, | |
795d57ce | 370 | struct lttng_event_exclusion *exclusion, void **extended_at) |
b4e3ceb9 PP |
371 | { |
372 | struct lttcomm_event_extended_header extended_header; | |
373 | size_t filter_len = 0; | |
795d57ce | 374 | size_t nb_exclusions = 0; |
b4e3ceb9 PP |
375 | |
376 | if (filter_expression) { | |
377 | filter_len = strlen(filter_expression) + 1; | |
378 | } | |
379 | ||
795d57ce PP |
380 | if (exclusion) { |
381 | nb_exclusions = exclusion->count; | |
382 | } | |
383 | ||
384 | /* Set header fields */ | |
b4e3ceb9 | 385 | extended_header.filter_len = filter_len; |
795d57ce PP |
386 | extended_header.nb_exclusions = nb_exclusions; |
387 | ||
388 | /* Copy header */ | |
b4e3ceb9 PP |
389 | memcpy(*extended_at, &extended_header, sizeof(extended_header)); |
390 | *extended_at += sizeof(extended_header); | |
795d57ce PP |
391 | |
392 | /* Copy filter string */ | |
393 | if (filter_expression) { | |
394 | memcpy(*extended_at, filter_expression, filter_len); | |
395 | *extended_at += filter_len; | |
396 | } | |
397 | ||
398 | /* Copy exclusion names */ | |
399 | if (exclusion) { | |
400 | size_t len = nb_exclusions * LTTNG_SYMBOL_NAME_LEN; | |
401 | ||
402 | memcpy(*extended_at, &exclusion->names, len); | |
403 | *extended_at += len; | |
404 | } | |
b4e3ceb9 PP |
405 | } |
406 | ||
3c6a091f | 407 | /* |
022d91ba | 408 | * Create a list of agent domain events. |
3c6a091f DG |
409 | * |
410 | * Return number of events in list on success or else a negative value. | |
411 | */ | |
022d91ba | 412 | static int list_lttng_agent_events(struct agent *agt, |
b4e3ceb9 | 413 | struct lttng_event **events, size_t *total_size) |
3c6a091f DG |
414 | { |
415 | int i = 0, ret = 0; | |
416 | unsigned int nb_event = 0; | |
022d91ba | 417 | struct agent_event *event; |
3c6a091f DG |
418 | struct lttng_event *tmp_events; |
419 | struct lttng_ht_iter iter; | |
b4e3ceb9 PP |
420 | size_t extended_len = 0; |
421 | void *extended_at; | |
3c6a091f | 422 | |
022d91ba | 423 | assert(agt); |
3c6a091f DG |
424 | assert(events); |
425 | ||
022d91ba | 426 | DBG3("Listing agent events"); |
3c6a091f | 427 | |
e5bbf678 | 428 | rcu_read_lock(); |
022d91ba | 429 | nb_event = lttng_ht_get_count(agt->events); |
e5bbf678 | 430 | rcu_read_unlock(); |
3c6a091f DG |
431 | if (nb_event == 0) { |
432 | ret = nb_event; | |
b4e3ceb9 | 433 | *total_size = 0; |
3c6a091f DG |
434 | goto error; |
435 | } | |
436 | ||
b4e3ceb9 PP |
437 | /* Compute required extended infos size */ |
438 | extended_len = nb_event * sizeof(struct lttcomm_event_extended_header); | |
439 | ||
440 | /* | |
441 | * This is only valid because the commands which add events are | |
442 | * processed in the same thread as the listing. | |
443 | */ | |
444 | rcu_read_lock(); | |
445 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { | |
795d57ce PP |
446 | increment_extended_len(event->filter_expression, NULL, |
447 | &extended_len); | |
b4e3ceb9 PP |
448 | } |
449 | rcu_read_unlock(); | |
450 | ||
451 | *total_size = nb_event * sizeof(*tmp_events) + extended_len; | |
452 | tmp_events = zmalloc(*total_size); | |
3c6a091f | 453 | if (!tmp_events) { |
022d91ba | 454 | PERROR("zmalloc agent events session"); |
3c6a091f DG |
455 | ret = -LTTNG_ERR_FATAL; |
456 | goto error; | |
457 | } | |
458 | ||
b4e3ceb9 PP |
459 | extended_at = ((uint8_t *) tmp_events) + |
460 | nb_event * sizeof(struct lttng_event); | |
461 | ||
3c6a091f | 462 | rcu_read_lock(); |
022d91ba | 463 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
3c6a091f DG |
464 | strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name)); |
465 | tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0'; | |
466 | tmp_events[i].enabled = event->enabled; | |
2106efa0 | 467 | tmp_events[i].loglevel = event->loglevel_value; |
ff94328f | 468 | tmp_events[i].loglevel_type = event->loglevel_type; |
3c6a091f | 469 | i++; |
b4e3ceb9 PP |
470 | |
471 | /* Append extended info */ | |
795d57ce PP |
472 | append_extended_info(event->filter_expression, NULL, |
473 | &extended_at); | |
3c6a091f DG |
474 | } |
475 | rcu_read_unlock(); | |
476 | ||
477 | *events = tmp_events; | |
478 | ret = nb_event; | |
479 | ||
480 | error: | |
481 | assert(nb_event == i); | |
482 | return ret; | |
483 | } | |
484 | ||
2f77fc4b DG |
485 | /* |
486 | * Create a list of ust global domain events. | |
487 | */ | |
488 | static int list_lttng_ust_global_events(char *channel_name, | |
b4e3ceb9 PP |
489 | struct ltt_ust_domain_global *ust_global, |
490 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
491 | { |
492 | int i = 0, ret = 0; | |
493 | unsigned int nb_event = 0; | |
494 | struct lttng_ht_iter iter; | |
495 | struct lttng_ht_node_str *node; | |
496 | struct ltt_ust_channel *uchan; | |
497 | struct ltt_ust_event *uevent; | |
498 | struct lttng_event *tmp; | |
b4e3ceb9 PP |
499 | size_t extended_len = 0; |
500 | void *extended_at; | |
2f77fc4b DG |
501 | |
502 | DBG("Listing UST global events for channel %s", channel_name); | |
503 | ||
504 | rcu_read_lock(); | |
505 | ||
506 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); | |
507 | node = lttng_ht_iter_get_node_str(&iter); | |
508 | if (node == NULL) { | |
f73fabfd | 509 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
d31d3e8c | 510 | goto end; |
2f77fc4b DG |
511 | } |
512 | ||
513 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); | |
514 | ||
3c442be3 | 515 | nb_event = lttng_ht_get_count(uchan->events); |
2f77fc4b DG |
516 | if (nb_event == 0) { |
517 | ret = nb_event; | |
b4e3ceb9 | 518 | *total_size = 0; |
d31d3e8c | 519 | goto end; |
2f77fc4b DG |
520 | } |
521 | ||
522 | DBG3("Listing UST global %d events", nb_event); | |
523 | ||
b4e3ceb9 PP |
524 | /* Compute required extended infos size */ |
525 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { | |
526 | if (uevent->internal) { | |
527 | nb_event--; | |
528 | continue; | |
529 | } | |
530 | ||
531 | increment_extended_len(uevent->filter_expression, | |
795d57ce | 532 | uevent->exclusion, &extended_len); |
b4e3ceb9 | 533 | } |
d31d3e8c PP |
534 | if (nb_event == 0) { |
535 | /* All events are internal, skip. */ | |
536 | ret = 0; | |
537 | *total_size = 0; | |
538 | goto end; | |
539 | } | |
b4e3ceb9 PP |
540 | |
541 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
542 | tmp = zmalloc(*total_size); | |
2f77fc4b | 543 | if (tmp == NULL) { |
b12c38df JG |
544 | ret = -LTTNG_ERR_FATAL; |
545 | goto end; | |
2f77fc4b DG |
546 | } |
547 | ||
b4e3ceb9 PP |
548 | extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event); |
549 | ||
2f77fc4b | 550 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
3c442be3 JG |
551 | if (uevent->internal) { |
552 | /* This event should remain hidden from clients */ | |
3c442be3 JG |
553 | continue; |
554 | } | |
2f77fc4b DG |
555 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
556 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
557 | tmp[i].enabled = uevent->enabled; | |
558 | ||
559 | switch (uevent->attr.instrumentation) { | |
560 | case LTTNG_UST_TRACEPOINT: | |
561 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
562 | break; | |
563 | case LTTNG_UST_PROBE: | |
564 | tmp[i].type = LTTNG_EVENT_PROBE; | |
565 | break; | |
566 | case LTTNG_UST_FUNCTION: | |
567 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
568 | break; | |
569 | } | |
570 | ||
571 | tmp[i].loglevel = uevent->attr.loglevel; | |
572 | switch (uevent->attr.loglevel_type) { | |
573 | case LTTNG_UST_LOGLEVEL_ALL: | |
574 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
575 | break; | |
576 | case LTTNG_UST_LOGLEVEL_RANGE: | |
577 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; | |
578 | break; | |
579 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
580 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; | |
581 | break; | |
582 | } | |
583 | if (uevent->filter) { | |
584 | tmp[i].filter = 1; | |
585 | } | |
4634f12e JI |
586 | if (uevent->exclusion) { |
587 | tmp[i].exclusion = 1; | |
588 | } | |
2f77fc4b | 589 | i++; |
b4e3ceb9 PP |
590 | |
591 | /* Append extended info */ | |
795d57ce PP |
592 | append_extended_info(uevent->filter_expression, |
593 | uevent->exclusion, &extended_at); | |
2f77fc4b DG |
594 | } |
595 | ||
596 | ret = nb_event; | |
597 | *events = tmp; | |
d31d3e8c | 598 | end: |
2f77fc4b DG |
599 | rcu_read_unlock(); |
600 | return ret; | |
601 | } | |
602 | ||
603 | /* | |
604 | * Fill lttng_event array of all kernel events in the channel. | |
605 | */ | |
606 | static int list_lttng_kernel_events(char *channel_name, | |
b4e3ceb9 PP |
607 | struct ltt_kernel_session *kernel_session, |
608 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
609 | { |
610 | int i = 0, ret; | |
611 | unsigned int nb_event; | |
612 | struct ltt_kernel_event *event; | |
613 | struct ltt_kernel_channel *kchan; | |
b4e3ceb9 PP |
614 | size_t extended_len = 0; |
615 | void *extended_at; | |
2f77fc4b DG |
616 | |
617 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
618 | if (kchan == NULL) { | |
f73fabfd | 619 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
620 | goto error; |
621 | } | |
622 | ||
623 | nb_event = kchan->event_count; | |
624 | ||
625 | DBG("Listing events for channel %s", kchan->channel->name); | |
626 | ||
627 | if (nb_event == 0) { | |
b4e3ceb9 | 628 | *total_size = 0; |
834978fd | 629 | *events = NULL; |
db906c12 | 630 | goto end; |
2f77fc4b DG |
631 | } |
632 | ||
b4e3ceb9 PP |
633 | /* Compute required extended infos size */ |
634 | cds_list_for_each_entry(event, &kchan->events_list.head, list) { | |
795d57ce PP |
635 | increment_extended_len(event->filter_expression, NULL, |
636 | &extended_len); | |
b4e3ceb9 PP |
637 | } |
638 | ||
639 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
640 | *events = zmalloc(*total_size); | |
2f77fc4b | 641 | if (*events == NULL) { |
f73fabfd | 642 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
643 | goto error; |
644 | } | |
645 | ||
ab4aa612 | 646 | extended_at = ((void *) *events) + |
b4e3ceb9 PP |
647 | nb_event * sizeof(struct lttng_event); |
648 | ||
2f77fc4b DG |
649 | /* Kernel channels */ |
650 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
651 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
652 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
653 | (*events)[i].enabled = event->enabled; | |
00f992f2 JG |
654 | (*events)[i].filter = |
655 | (unsigned char) !!event->filter_expression; | |
2f77fc4b DG |
656 | |
657 | switch (event->event->instrumentation) { | |
658 | case LTTNG_KERNEL_TRACEPOINT: | |
659 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; | |
660 | break; | |
2f77fc4b | 661 | case LTTNG_KERNEL_KRETPROBE: |
1896972b DG |
662 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
663 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
664 | sizeof(struct lttng_kernel_kprobe)); | |
665 | break; | |
666 | case LTTNG_KERNEL_KPROBE: | |
2f77fc4b DG |
667 | (*events)[i].type = LTTNG_EVENT_PROBE; |
668 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
669 | sizeof(struct lttng_kernel_kprobe)); | |
670 | break; | |
671 | case LTTNG_KERNEL_FUNCTION: | |
672 | (*events)[i].type = LTTNG_EVENT_FUNCTION; | |
673 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
674 | sizeof(struct lttng_kernel_function)); | |
675 | break; | |
676 | case LTTNG_KERNEL_NOOP: | |
677 | (*events)[i].type = LTTNG_EVENT_NOOP; | |
678 | break; | |
679 | case LTTNG_KERNEL_SYSCALL: | |
680 | (*events)[i].type = LTTNG_EVENT_SYSCALL; | |
681 | break; | |
682 | case LTTNG_KERNEL_ALL: | |
683 | assert(0); | |
684 | break; | |
685 | } | |
686 | i++; | |
b4e3ceb9 PP |
687 | |
688 | /* Append extended info */ | |
795d57ce PP |
689 | append_extended_info(event->filter_expression, NULL, |
690 | &extended_at); | |
2f77fc4b DG |
691 | } |
692 | ||
db906c12 | 693 | end: |
2f77fc4b DG |
694 | return nb_event; |
695 | ||
696 | error: | |
f73fabfd DG |
697 | /* Negate the error code to differentiate the size from an error */ |
698 | return -ret; | |
2f77fc4b DG |
699 | } |
700 | ||
701 | /* | |
702 | * Add URI so the consumer output object. Set the correct path depending on the | |
703 | * domain adding the default trace directory. | |
704 | */ | |
705 | static int add_uri_to_consumer(struct consumer_output *consumer, | |
56a37563 JG |
706 | struct lttng_uri *uri, enum lttng_domain_type domain, |
707 | const char *session_name) | |
2f77fc4b | 708 | { |
f73fabfd | 709 | int ret = LTTNG_OK; |
2f77fc4b DG |
710 | const char *default_trace_dir; |
711 | ||
712 | assert(uri); | |
713 | ||
714 | if (consumer == NULL) { | |
715 | DBG("No consumer detected. Don't add URI. Stopping."); | |
f73fabfd | 716 | ret = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
717 | goto error; |
718 | } | |
719 | ||
720 | switch (domain) { | |
721 | case LTTNG_DOMAIN_KERNEL: | |
722 | default_trace_dir = DEFAULT_KERNEL_TRACE_DIR; | |
723 | break; | |
724 | case LTTNG_DOMAIN_UST: | |
725 | default_trace_dir = DEFAULT_UST_TRACE_DIR; | |
726 | break; | |
727 | default: | |
728 | /* | |
729 | * This case is possible is we try to add the URI to the global tracing | |
730 | * session consumer object which in this case there is no subdir. | |
731 | */ | |
732 | default_trace_dir = ""; | |
733 | } | |
734 | ||
735 | switch (uri->dtype) { | |
736 | case LTTNG_DST_IPV4: | |
737 | case LTTNG_DST_IPV6: | |
738 | DBG2("Setting network URI to consumer"); | |
739 | ||
df75acac DG |
740 | if (consumer->type == CONSUMER_DST_NET) { |
741 | if ((uri->stype == LTTNG_STREAM_CONTROL && | |
785d2d0d DG |
742 | consumer->dst.net.control_isset) || |
743 | (uri->stype == LTTNG_STREAM_DATA && | |
744 | consumer->dst.net.data_isset)) { | |
df75acac DG |
745 | ret = LTTNG_ERR_URL_EXIST; |
746 | goto error; | |
747 | } | |
748 | } else { | |
749 | memset(&consumer->dst.net, 0, sizeof(consumer->dst.net)); | |
785d2d0d DG |
750 | } |
751 | ||
df75acac DG |
752 | consumer->type = CONSUMER_DST_NET; |
753 | ||
2f77fc4b DG |
754 | /* Set URI into consumer output object */ |
755 | ret = consumer_set_network_uri(consumer, uri); | |
756 | if (ret < 0) { | |
a74934ba | 757 | ret = -ret; |
2f77fc4b DG |
758 | goto error; |
759 | } else if (ret == 1) { | |
760 | /* | |
761 | * URI was the same in the consumer so we do not append the subdir | |
762 | * again so to not duplicate output dir. | |
763 | */ | |
f86c9f4e | 764 | ret = LTTNG_OK; |
2f77fc4b DG |
765 | goto error; |
766 | } | |
767 | ||
768 | if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) { | |
769 | ret = consumer_set_subdir(consumer, session_name); | |
770 | if (ret < 0) { | |
f73fabfd | 771 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
772 | goto error; |
773 | } | |
774 | } | |
775 | ||
776 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
777 | /* On a new subdir, reappend the default trace dir. */ | |
c30ce0b3 CB |
778 | strncat(consumer->subdir, default_trace_dir, |
779 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
780 | DBG3("Append domain trace name to subdir %s", consumer->subdir); |
781 | } | |
782 | ||
783 | break; | |
784 | case LTTNG_DST_PATH: | |
785 | DBG2("Setting trace directory path from URI to %s", uri->dst.path); | |
786 | memset(consumer->dst.trace_path, 0, | |
787 | sizeof(consumer->dst.trace_path)); | |
9ac05d92 MD |
788 | /* Explicit length checks for strcpy and strcat. */ |
789 | if (strlen(uri->dst.path) + strlen(default_trace_dir) | |
790 | >= sizeof(consumer->dst.trace_path)) { | |
791 | ret = LTTNG_ERR_FATAL; | |
792 | goto error; | |
793 | } | |
794 | strcpy(consumer->dst.trace_path, uri->dst.path); | |
2f77fc4b | 795 | /* Append default trace dir */ |
9ac05d92 | 796 | strcat(consumer->dst.trace_path, default_trace_dir); |
2f77fc4b DG |
797 | /* Flag consumer as local. */ |
798 | consumer->type = CONSUMER_DST_LOCAL; | |
799 | break; | |
800 | } | |
801 | ||
a74934ba DG |
802 | ret = LTTNG_OK; |
803 | ||
2f77fc4b DG |
804 | error: |
805 | return ret; | |
806 | } | |
807 | ||
808 | /* | |
809 | * Init tracing by creating trace directory and sending fds kernel consumer. | |
810 | */ | |
811 | static int init_kernel_tracing(struct ltt_kernel_session *session) | |
812 | { | |
813 | int ret = 0; | |
814 | struct lttng_ht_iter iter; | |
815 | struct consumer_socket *socket; | |
816 | ||
817 | assert(session); | |
818 | ||
e7fe706f DG |
819 | rcu_read_lock(); |
820 | ||
2f77fc4b DG |
821 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { |
822 | cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter, | |
823 | socket, node.node) { | |
2f77fc4b | 824 | pthread_mutex_lock(socket->lock); |
f50f23d9 | 825 | ret = kernel_consumer_send_session(socket, session); |
2f77fc4b DG |
826 | pthread_mutex_unlock(socket->lock); |
827 | if (ret < 0) { | |
f73fabfd | 828 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
829 | goto error; |
830 | } | |
831 | } | |
832 | } | |
833 | ||
834 | error: | |
e7fe706f | 835 | rcu_read_unlock(); |
2f77fc4b DG |
836 | return ret; |
837 | } | |
838 | ||
839 | /* | |
840 | * Create a socket to the relayd using the URI. | |
841 | * | |
842 | * On success, the relayd_sock pointer is set to the created socket. | |
843 | * Else, it's stays untouched and a lttcomm error code is returned. | |
844 | */ | |
6151a90f | 845 | static int create_connect_relayd(struct lttng_uri *uri, |
b31610f2 JD |
846 | struct lttcomm_relayd_sock **relayd_sock, |
847 | struct consumer_output *consumer) | |
2f77fc4b DG |
848 | { |
849 | int ret; | |
6151a90f | 850 | struct lttcomm_relayd_sock *rsock; |
2f77fc4b | 851 | |
6151a90f JD |
852 | rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR, |
853 | RELAYD_VERSION_COMM_MINOR); | |
854 | if (!rsock) { | |
f73fabfd | 855 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
856 | goto error; |
857 | } | |
858 | ||
ffe60014 DG |
859 | /* |
860 | * Connect to relayd so we can proceed with a session creation. This call | |
861 | * can possibly block for an arbitrary amount of time to set the health | |
862 | * state to be in poll execution. | |
863 | */ | |
864 | health_poll_entry(); | |
6151a90f | 865 | ret = relayd_connect(rsock); |
ffe60014 | 866 | health_poll_exit(); |
2f77fc4b DG |
867 | if (ret < 0) { |
868 | ERR("Unable to reach lttng-relayd"); | |
f73fabfd | 869 | ret = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
870 | goto free_sock; |
871 | } | |
872 | ||
873 | /* Create socket for control stream. */ | |
874 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
875 | DBG3("Creating relayd stream socket from URI"); | |
876 | ||
877 | /* Check relayd version */ | |
6151a90f | 878 | ret = relayd_version_check(rsock); |
2f77fc4b | 879 | if (ret < 0) { |
f73fabfd | 880 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; |
2f77fc4b DG |
881 | goto close_sock; |
882 | } | |
b31610f2 JD |
883 | consumer->relay_major_version = rsock->major; |
884 | consumer->relay_minor_version = rsock->minor; | |
2f77fc4b DG |
885 | } else if (uri->stype == LTTNG_STREAM_DATA) { |
886 | DBG3("Creating relayd data socket from URI"); | |
887 | } else { | |
888 | /* Command is not valid */ | |
889 | ERR("Relayd invalid stream type: %d", uri->stype); | |
f73fabfd | 890 | ret = LTTNG_ERR_INVALID; |
2f77fc4b DG |
891 | goto close_sock; |
892 | } | |
893 | ||
6151a90f | 894 | *relayd_sock = rsock; |
2f77fc4b | 895 | |
f73fabfd | 896 | return LTTNG_OK; |
2f77fc4b DG |
897 | |
898 | close_sock: | |
6151a90f JD |
899 | /* The returned value is not useful since we are on an error path. */ |
900 | (void) relayd_close(rsock); | |
2f77fc4b | 901 | free_sock: |
6151a90f | 902 | free(rsock); |
2f77fc4b DG |
903 | error: |
904 | return ret; | |
905 | } | |
906 | ||
907 | /* | |
908 | * Connect to the relayd using URI and send the socket to the right consumer. | |
909 | */ | |
56a37563 JG |
910 | static int send_consumer_relayd_socket(enum lttng_domain_type domain, |
911 | unsigned int session_id, struct lttng_uri *relayd_uri, | |
912 | struct consumer_output *consumer, | |
d3e2ba59 JD |
913 | struct consumer_socket *consumer_sock, |
914 | char *session_name, char *hostname, int session_live_timer) | |
2f77fc4b DG |
915 | { |
916 | int ret; | |
6151a90f | 917 | struct lttcomm_relayd_sock *rsock = NULL; |
2f77fc4b | 918 | |
ffe60014 | 919 | /* Connect to relayd and make version check if uri is the control. */ |
b31610f2 | 920 | ret = create_connect_relayd(relayd_uri, &rsock, consumer); |
ffe60014 | 921 | if (ret != LTTNG_OK) { |
6151a90f | 922 | goto error; |
ffe60014 | 923 | } |
6151a90f | 924 | assert(rsock); |
ffe60014 | 925 | |
2f77fc4b | 926 | /* Set the network sequence index if not set. */ |
d88aee68 DG |
927 | if (consumer->net_seq_index == (uint64_t) -1ULL) { |
928 | pthread_mutex_lock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
929 | /* |
930 | * Increment net_seq_idx because we are about to transfer the | |
931 | * new relayd socket to the consumer. | |
d88aee68 | 932 | * Assign unique key so the consumer can match streams. |
2f77fc4b | 933 | */ |
d88aee68 DG |
934 | consumer->net_seq_index = ++relayd_net_seq_idx; |
935 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
936 | } |
937 | ||
2f77fc4b | 938 | /* Send relayd socket to consumer. */ |
6151a90f | 939 | ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer, |
d3e2ba59 JD |
940 | relayd_uri->stype, session_id, |
941 | session_name, hostname, session_live_timer); | |
2f77fc4b | 942 | if (ret < 0) { |
f73fabfd | 943 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
944 | goto close_sock; |
945 | } | |
946 | ||
c890b720 DG |
947 | /* Flag that the corresponding socket was sent. */ |
948 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
ffe60014 | 949 | consumer_sock->control_sock_sent = 1; |
c890b720 | 950 | } else if (relayd_uri->stype == LTTNG_STREAM_DATA) { |
ffe60014 | 951 | consumer_sock->data_sock_sent = 1; |
c890b720 DG |
952 | } |
953 | ||
f73fabfd | 954 | ret = LTTNG_OK; |
2f77fc4b DG |
955 | |
956 | /* | |
957 | * Close socket which was dup on the consumer side. The session daemon does | |
958 | * NOT keep track of the relayd socket(s) once transfer to the consumer. | |
959 | */ | |
960 | ||
961 | close_sock: | |
6151a90f JD |
962 | (void) relayd_close(rsock); |
963 | free(rsock); | |
2f77fc4b | 964 | |
6151a90f | 965 | error: |
ffe60014 DG |
966 | if (ret != LTTNG_OK) { |
967 | /* | |
d9078d0c DG |
968 | * The consumer output for this session should not be used anymore |
969 | * since the relayd connection failed thus making any tracing or/and | |
970 | * streaming not usable. | |
ffe60014 | 971 | */ |
d9078d0c | 972 | consumer->enabled = 0; |
ffe60014 | 973 | } |
2f77fc4b DG |
974 | return ret; |
975 | } | |
976 | ||
977 | /* | |
978 | * Send both relayd sockets to a specific consumer and domain. This is a | |
979 | * helper function to facilitate sending the information to the consumer for a | |
980 | * session. | |
981 | */ | |
56a37563 JG |
982 | static int send_consumer_relayd_sockets(enum lttng_domain_type domain, |
983 | unsigned int session_id, struct consumer_output *consumer, | |
984 | struct consumer_socket *sock, char *session_name, | |
985 | char *hostname, int session_live_timer) | |
2f77fc4b | 986 | { |
dda67f6c | 987 | int ret = LTTNG_OK; |
2f77fc4b | 988 | |
2f77fc4b | 989 | assert(consumer); |
6dc3064a | 990 | assert(sock); |
2f77fc4b | 991 | |
2f77fc4b | 992 | /* Sending control relayd socket. */ |
ffe60014 | 993 | if (!sock->control_sock_sent) { |
6dc3064a | 994 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
995 | &consumer->dst.net.control, consumer, sock, |
996 | session_name, hostname, session_live_timer); | |
c890b720 DG |
997 | if (ret != LTTNG_OK) { |
998 | goto error; | |
999 | } | |
2f77fc4b DG |
1000 | } |
1001 | ||
1002 | /* Sending data relayd socket. */ | |
ffe60014 | 1003 | if (!sock->data_sock_sent) { |
6dc3064a | 1004 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
1005 | &consumer->dst.net.data, consumer, sock, |
1006 | session_name, hostname, session_live_timer); | |
c890b720 DG |
1007 | if (ret != LTTNG_OK) { |
1008 | goto error; | |
1009 | } | |
2f77fc4b DG |
1010 | } |
1011 | ||
2f77fc4b DG |
1012 | error: |
1013 | return ret; | |
1014 | } | |
1015 | ||
1016 | /* | |
1017 | * Setup relayd connections for a tracing session. First creates the socket to | |
1018 | * the relayd and send them to the right domain consumer. Consumer type MUST be | |
1019 | * network. | |
1020 | */ | |
ffe60014 | 1021 | int cmd_setup_relayd(struct ltt_session *session) |
2f77fc4b | 1022 | { |
f73fabfd | 1023 | int ret = LTTNG_OK; |
2f77fc4b DG |
1024 | struct ltt_ust_session *usess; |
1025 | struct ltt_kernel_session *ksess; | |
1026 | struct consumer_socket *socket; | |
1027 | struct lttng_ht_iter iter; | |
1028 | ||
1029 | assert(session); | |
1030 | ||
1031 | usess = session->ust_session; | |
1032 | ksess = session->kernel_session; | |
1033 | ||
785d2d0d | 1034 | DBG("Setting relayd for session %s", session->name); |
2f77fc4b | 1035 | |
e7fe706f DG |
1036 | rcu_read_lock(); |
1037 | ||
2f77fc4b DG |
1038 | if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET |
1039 | && usess->consumer->enabled) { | |
1040 | /* For each consumer socket, send relayd sockets */ | |
1041 | cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, | |
1042 | socket, node.node) { | |
2f77fc4b | 1043 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1044 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id, |
d3e2ba59 JD |
1045 | usess->consumer, socket, |
1046 | session->name, session->hostname, | |
1047 | session->live_timer); | |
2f77fc4b | 1048 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1049 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1050 | goto error; |
1051 | } | |
6dc3064a DG |
1052 | /* Session is now ready for network streaming. */ |
1053 | session->net_handle = 1; | |
2f77fc4b | 1054 | } |
b31610f2 JD |
1055 | session->consumer->relay_major_version = |
1056 | usess->consumer->relay_major_version; | |
1057 | session->consumer->relay_minor_version = | |
1058 | usess->consumer->relay_minor_version; | |
2f77fc4b DG |
1059 | } |
1060 | ||
1061 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET | |
1062 | && ksess->consumer->enabled) { | |
1063 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1064 | socket, node.node) { | |
2f77fc4b | 1065 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1066 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id, |
d3e2ba59 JD |
1067 | ksess->consumer, socket, |
1068 | session->name, session->hostname, | |
1069 | session->live_timer); | |
2f77fc4b | 1070 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1071 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1072 | goto error; |
1073 | } | |
6dc3064a DG |
1074 | /* Session is now ready for network streaming. */ |
1075 | session->net_handle = 1; | |
2f77fc4b | 1076 | } |
b31610f2 JD |
1077 | session->consumer->relay_major_version = |
1078 | ksess->consumer->relay_major_version; | |
1079 | session->consumer->relay_minor_version = | |
1080 | ksess->consumer->relay_minor_version; | |
2f77fc4b DG |
1081 | } |
1082 | ||
1083 | error: | |
e7fe706f | 1084 | rcu_read_unlock(); |
2f77fc4b DG |
1085 | return ret; |
1086 | } | |
1087 | ||
9b6c7ec5 DG |
1088 | /* |
1089 | * Start a kernel session by opening all necessary streams. | |
1090 | */ | |
1091 | static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe) | |
1092 | { | |
1093 | int ret; | |
1094 | struct ltt_kernel_channel *kchan; | |
1095 | ||
1096 | /* Open kernel metadata */ | |
07b86b52 | 1097 | if (ksess->metadata == NULL && ksess->output_traces) { |
9b6c7ec5 DG |
1098 | ret = kernel_open_metadata(ksess); |
1099 | if (ret < 0) { | |
1100 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1101 | goto error; | |
1102 | } | |
1103 | } | |
1104 | ||
1105 | /* Open kernel metadata stream */ | |
07b86b52 | 1106 | if (ksess->metadata && ksess->metadata_stream_fd < 0) { |
9b6c7ec5 DG |
1107 | ret = kernel_open_metadata_stream(ksess); |
1108 | if (ret < 0) { | |
1109 | ERR("Kernel create metadata stream failed"); | |
1110 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1111 | goto error; | |
1112 | } | |
1113 | } | |
1114 | ||
1115 | /* For each channel */ | |
1116 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
1117 | if (kchan->stream_count == 0) { | |
1118 | ret = kernel_open_channel_stream(kchan); | |
1119 | if (ret < 0) { | |
1120 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1121 | goto error; | |
1122 | } | |
1123 | /* Update the stream global counter */ | |
1124 | ksess->stream_count_global += ret; | |
1125 | } | |
1126 | } | |
1127 | ||
1128 | /* Setup kernel consumer socket and send fds to it */ | |
1129 | ret = init_kernel_tracing(ksess); | |
e43c41c5 | 1130 | if (ret != 0) { |
9b6c7ec5 DG |
1131 | ret = LTTNG_ERR_KERN_START_FAIL; |
1132 | goto error; | |
1133 | } | |
1134 | ||
1135 | /* This start the kernel tracing */ | |
1136 | ret = kernel_start_session(ksess); | |
1137 | if (ret < 0) { | |
1138 | ret = LTTNG_ERR_KERN_START_FAIL; | |
1139 | goto error; | |
1140 | } | |
1141 | ||
1142 | /* Quiescent wait after starting trace */ | |
784303b0 | 1143 | kernel_wait_quiescent(kernel_tracer_fd); |
9b6c7ec5 | 1144 | |
14fb1ebe | 1145 | ksess->active = 1; |
9b6c7ec5 DG |
1146 | |
1147 | ret = LTTNG_OK; | |
1148 | ||
1149 | error: | |
1150 | return ret; | |
1151 | } | |
1152 | ||
2f77fc4b DG |
1153 | /* |
1154 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. | |
1155 | */ | |
56a37563 JG |
1156 | int cmd_disable_channel(struct ltt_session *session, |
1157 | enum lttng_domain_type domain, char *channel_name) | |
2f77fc4b DG |
1158 | { |
1159 | int ret; | |
1160 | struct ltt_ust_session *usess; | |
1161 | ||
1162 | usess = session->ust_session; | |
1163 | ||
2223c96f DG |
1164 | rcu_read_lock(); |
1165 | ||
2f77fc4b DG |
1166 | switch (domain) { |
1167 | case LTTNG_DOMAIN_KERNEL: | |
1168 | { | |
1169 | ret = channel_kernel_disable(session->kernel_session, | |
1170 | channel_name); | |
f73fabfd | 1171 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1172 | goto error; |
1173 | } | |
1174 | ||
1175 | kernel_wait_quiescent(kernel_tracer_fd); | |
1176 | break; | |
1177 | } | |
1178 | case LTTNG_DOMAIN_UST: | |
1179 | { | |
1180 | struct ltt_ust_channel *uchan; | |
1181 | struct lttng_ht *chan_ht; | |
1182 | ||
1183 | chan_ht = usess->domain_global.channels; | |
1184 | ||
1185 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
1186 | if (uchan == NULL) { | |
f73fabfd | 1187 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
1188 | goto error; |
1189 | } | |
1190 | ||
7972aab2 | 1191 | ret = channel_ust_disable(usess, uchan); |
f73fabfd | 1192 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1193 | goto error; |
1194 | } | |
1195 | break; | |
1196 | } | |
2f77fc4b | 1197 | default: |
f73fabfd | 1198 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1199 | goto error; |
1200 | } | |
1201 | ||
f73fabfd | 1202 | ret = LTTNG_OK; |
2f77fc4b DG |
1203 | |
1204 | error: | |
2223c96f | 1205 | rcu_read_unlock(); |
2f77fc4b DG |
1206 | return ret; |
1207 | } | |
1208 | ||
ccf10263 MD |
1209 | /* |
1210 | * Command LTTNG_TRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1211 | * |
1212 | * Called with session lock held. | |
ccf10263 | 1213 | */ |
56a37563 JG |
1214 | int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1215 | int pid) | |
ccf10263 MD |
1216 | { |
1217 | int ret; | |
1218 | ||
1219 | rcu_read_lock(); | |
1220 | ||
1221 | switch (domain) { | |
1222 | case LTTNG_DOMAIN_KERNEL: | |
1223 | { | |
1224 | struct ltt_kernel_session *ksess; | |
1225 | ||
1226 | ksess = session->kernel_session; | |
1227 | ||
1228 | ret = kernel_track_pid(ksess, pid); | |
1229 | if (ret != LTTNG_OK) { | |
1230 | goto error; | |
1231 | } | |
1232 | ||
1233 | kernel_wait_quiescent(kernel_tracer_fd); | |
1234 | break; | |
1235 | } | |
ccf10263 | 1236 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1237 | { |
1238 | struct ltt_ust_session *usess; | |
1239 | ||
1240 | usess = session->ust_session; | |
1241 | ||
1242 | ret = trace_ust_track_pid(usess, pid); | |
1243 | if (ret != LTTNG_OK) { | |
1244 | goto error; | |
1245 | } | |
1246 | break; | |
1247 | } | |
ccf10263 MD |
1248 | default: |
1249 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1250 | goto error; | |
1251 | } | |
1252 | ||
1253 | ret = LTTNG_OK; | |
1254 | ||
1255 | error: | |
1256 | rcu_read_unlock(); | |
1257 | return ret; | |
1258 | } | |
1259 | ||
1260 | /* | |
1261 | * Command LTTNG_UNTRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1262 | * |
1263 | * Called with session lock held. | |
ccf10263 | 1264 | */ |
56a37563 JG |
1265 | int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1266 | int pid) | |
ccf10263 MD |
1267 | { |
1268 | int ret; | |
1269 | ||
1270 | rcu_read_lock(); | |
1271 | ||
1272 | switch (domain) { | |
1273 | case LTTNG_DOMAIN_KERNEL: | |
1274 | { | |
1275 | struct ltt_kernel_session *ksess; | |
1276 | ||
1277 | ksess = session->kernel_session; | |
1278 | ||
1279 | ret = kernel_untrack_pid(ksess, pid); | |
1280 | if (ret != LTTNG_OK) { | |
1281 | goto error; | |
1282 | } | |
1283 | ||
1284 | kernel_wait_quiescent(kernel_tracer_fd); | |
1285 | break; | |
1286 | } | |
ccf10263 | 1287 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1288 | { |
1289 | struct ltt_ust_session *usess; | |
1290 | ||
1291 | usess = session->ust_session; | |
1292 | ||
1293 | ret = trace_ust_untrack_pid(usess, pid); | |
1294 | if (ret != LTTNG_OK) { | |
1295 | goto error; | |
1296 | } | |
1297 | break; | |
1298 | } | |
ccf10263 MD |
1299 | default: |
1300 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1301 | goto error; | |
1302 | } | |
1303 | ||
1304 | ret = LTTNG_OK; | |
1305 | ||
1306 | error: | |
1307 | rcu_read_unlock(); | |
1308 | return ret; | |
1309 | } | |
1310 | ||
2f77fc4b DG |
1311 | /* |
1312 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
1313 | * | |
1314 | * The wpipe arguments is used as a notifier for the kernel thread. | |
1315 | */ | |
1316 | int cmd_enable_channel(struct ltt_session *session, | |
7972aab2 | 1317 | struct lttng_domain *domain, struct lttng_channel *attr, int wpipe) |
2f77fc4b DG |
1318 | { |
1319 | int ret; | |
1320 | struct ltt_ust_session *usess = session->ust_session; | |
1321 | struct lttng_ht *chan_ht; | |
1f345e94 | 1322 | size_t len; |
2f77fc4b DG |
1323 | |
1324 | assert(session); | |
1325 | assert(attr); | |
7972aab2 | 1326 | assert(domain); |
2f77fc4b | 1327 | |
f5436bfc | 1328 | len = lttng_strnlen(attr->name, sizeof(attr->name)); |
1f345e94 PP |
1329 | |
1330 | /* Validate channel name */ | |
1331 | if (attr->name[0] == '.' || | |
1332 | memchr(attr->name, '/', len) != NULL) { | |
1333 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1334 | goto end; | |
1335 | } | |
1336 | ||
2f77fc4b DG |
1337 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
1338 | ||
03b4fdcf DG |
1339 | rcu_read_lock(); |
1340 | ||
ecc48a90 JD |
1341 | /* |
1342 | * Don't try to enable a channel if the session has been started at | |
1343 | * some point in time before. The tracer does not allow it. | |
1344 | */ | |
8382cf6f | 1345 | if (session->has_been_started) { |
ecc48a90 JD |
1346 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
1347 | goto error; | |
1348 | } | |
1349 | ||
1350 | /* | |
1351 | * If the session is a live session, remove the switch timer, the | |
1352 | * live timer does the same thing but sends also synchronisation | |
1353 | * beacons for inactive streams. | |
1354 | */ | |
1355 | if (session->live_timer > 0) { | |
1356 | attr->attr.live_timer_interval = session->live_timer; | |
1357 | attr->attr.switch_timer_interval = 0; | |
1358 | } | |
1359 | ||
7972aab2 | 1360 | switch (domain->type) { |
2f77fc4b DG |
1361 | case LTTNG_DOMAIN_KERNEL: |
1362 | { | |
1363 | struct ltt_kernel_channel *kchan; | |
1364 | ||
2f77fc4b DG |
1365 | kchan = trace_kernel_get_channel_by_name(attr->name, |
1366 | session->kernel_session); | |
1367 | if (kchan == NULL) { | |
1368 | ret = channel_kernel_create(session->kernel_session, attr, wpipe); | |
85076754 MD |
1369 | if (attr->name[0] != '\0') { |
1370 | session->kernel_session->has_non_default_channel = 1; | |
1371 | } | |
2f77fc4b DG |
1372 | } else { |
1373 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
1374 | } | |
1375 | ||
f73fabfd | 1376 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1377 | goto error; |
1378 | } | |
1379 | ||
784303b0 | 1380 | kernel_wait_quiescent(kernel_tracer_fd); |
2f77fc4b DG |
1381 | break; |
1382 | } | |
1383 | case LTTNG_DOMAIN_UST: | |
9232818f JG |
1384 | case LTTNG_DOMAIN_JUL: |
1385 | case LTTNG_DOMAIN_LOG4J: | |
1386 | case LTTNG_DOMAIN_PYTHON: | |
2f77fc4b DG |
1387 | { |
1388 | struct ltt_ust_channel *uchan; | |
1389 | ||
9232818f JG |
1390 | /* |
1391 | * FIXME | |
1392 | * | |
1393 | * Current agent implementation limitations force us to allow | |
1394 | * only one channel at once in "agent" subdomains. Each | |
1395 | * subdomain has a default channel name which must be strictly | |
1396 | * adhered to. | |
1397 | */ | |
1398 | if (domain->type == LTTNG_DOMAIN_JUL) { | |
1399 | if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME, | |
1400 | LTTNG_SYMBOL_NAME_LEN)) { | |
1401 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1402 | goto error; | |
1403 | } | |
1404 | } else if (domain->type == LTTNG_DOMAIN_LOG4J) { | |
1405 | if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME, | |
1406 | LTTNG_SYMBOL_NAME_LEN)) { | |
1407 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1408 | goto error; | |
1409 | } | |
1410 | } else if (domain->type == LTTNG_DOMAIN_PYTHON) { | |
1411 | if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME, | |
1412 | LTTNG_SYMBOL_NAME_LEN)) { | |
1413 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1414 | goto error; | |
1415 | } | |
1416 | } | |
1417 | ||
2f77fc4b DG |
1418 | chan_ht = usess->domain_global.channels; |
1419 | ||
1420 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); | |
1421 | if (uchan == NULL) { | |
7972aab2 | 1422 | ret = channel_ust_create(usess, attr, domain->buf_type); |
85076754 MD |
1423 | if (attr->name[0] != '\0') { |
1424 | usess->has_non_default_channel = 1; | |
1425 | } | |
2f77fc4b | 1426 | } else { |
7972aab2 | 1427 | ret = channel_ust_enable(usess, uchan); |
2f77fc4b DG |
1428 | } |
1429 | break; | |
1430 | } | |
2f77fc4b | 1431 | default: |
f73fabfd | 1432 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1433 | goto error; |
1434 | } | |
1435 | ||
1436 | error: | |
2223c96f | 1437 | rcu_read_unlock(); |
1f345e94 | 1438 | end: |
2f77fc4b DG |
1439 | return ret; |
1440 | } | |
1441 | ||
2f77fc4b DG |
1442 | /* |
1443 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1444 | */ | |
56a37563 JG |
1445 | int cmd_disable_event(struct ltt_session *session, |
1446 | enum lttng_domain_type domain, char *channel_name, | |
6e911cad | 1447 | struct lttng_event *event) |
2f77fc4b DG |
1448 | { |
1449 | int ret; | |
6e911cad MD |
1450 | char *event_name; |
1451 | ||
18a720cd MD |
1452 | DBG("Disable event command for event \'%s\'", event->name); |
1453 | ||
6e911cad MD |
1454 | event_name = event->name; |
1455 | ||
9b7431cf JG |
1456 | /* Error out on unhandled search criteria */ |
1457 | if (event->loglevel_type || event->loglevel != -1 || event->enabled | |
6e911cad | 1458 | || event->pid || event->filter || event->exclusion) { |
7076b56e JG |
1459 | ret = LTTNG_ERR_UNK; |
1460 | goto error; | |
6e911cad | 1461 | } |
2f77fc4b | 1462 | |
2223c96f DG |
1463 | rcu_read_lock(); |
1464 | ||
2f77fc4b DG |
1465 | switch (domain) { |
1466 | case LTTNG_DOMAIN_KERNEL: | |
1467 | { | |
1468 | struct ltt_kernel_channel *kchan; | |
1469 | struct ltt_kernel_session *ksess; | |
1470 | ||
1471 | ksess = session->kernel_session; | |
1472 | ||
85076754 MD |
1473 | /* |
1474 | * If a non-default channel has been created in the | |
1475 | * session, explicitely require that -c chan_name needs | |
1476 | * to be provided. | |
1477 | */ | |
1478 | if (ksess->has_non_default_channel && channel_name[0] == '\0') { | |
1479 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1480 | goto error_unlock; |
85076754 MD |
1481 | } |
1482 | ||
2f77fc4b DG |
1483 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
1484 | if (kchan == NULL) { | |
f73fabfd | 1485 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
7076b56e | 1486 | goto error_unlock; |
2f77fc4b DG |
1487 | } |
1488 | ||
6e911cad MD |
1489 | switch (event->type) { |
1490 | case LTTNG_EVENT_ALL: | |
9550ee81 | 1491 | case LTTNG_EVENT_TRACEPOINT: |
d0ae4ea8 | 1492 | case LTTNG_EVENT_SYSCALL: |
9550ee81 JR |
1493 | case LTTNG_EVENT_PROBE: |
1494 | case LTTNG_EVENT_FUNCTION: | |
1495 | case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */ | |
1496 | if (event_name[0] == '\0') { | |
1497 | ret = event_kernel_disable_event(kchan, | |
1498 | NULL, event->type); | |
29c62722 | 1499 | } else { |
d0ae4ea8 | 1500 | ret = event_kernel_disable_event(kchan, |
9550ee81 | 1501 | event_name, event->type); |
29c62722 | 1502 | } |
6e911cad | 1503 | if (ret != LTTNG_OK) { |
7076b56e | 1504 | goto error_unlock; |
6e911cad MD |
1505 | } |
1506 | break; | |
6e911cad MD |
1507 | default: |
1508 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1509 | goto error_unlock; |
2f77fc4b DG |
1510 | } |
1511 | ||
1512 | kernel_wait_quiescent(kernel_tracer_fd); | |
1513 | break; | |
1514 | } | |
1515 | case LTTNG_DOMAIN_UST: | |
1516 | { | |
1517 | struct ltt_ust_channel *uchan; | |
1518 | struct ltt_ust_session *usess; | |
1519 | ||
1520 | usess = session->ust_session; | |
1521 | ||
7076b56e JG |
1522 | if (validate_ust_event_name(event_name)) { |
1523 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1524 | goto error_unlock; | |
1525 | } | |
1526 | ||
85076754 MD |
1527 | /* |
1528 | * If a non-default channel has been created in the | |
9550ee81 | 1529 | * session, explicitly require that -c chan_name needs |
85076754 MD |
1530 | * to be provided. |
1531 | */ | |
1532 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1533 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1534 | goto error_unlock; |
85076754 MD |
1535 | } |
1536 | ||
2f77fc4b DG |
1537 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
1538 | channel_name); | |
1539 | if (uchan == NULL) { | |
f73fabfd | 1540 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
7076b56e | 1541 | goto error_unlock; |
2f77fc4b DG |
1542 | } |
1543 | ||
6e911cad MD |
1544 | switch (event->type) { |
1545 | case LTTNG_EVENT_ALL: | |
b3639870 JR |
1546 | /* |
1547 | * An empty event name means that everything | |
1548 | * should be disabled. | |
1549 | */ | |
1550 | if (event->name[0] == '\0') { | |
1551 | ret = event_ust_disable_all_tracepoints(usess, uchan); | |
77d536b2 JR |
1552 | } else { |
1553 | ret = event_ust_disable_tracepoint(usess, uchan, | |
1554 | event_name); | |
1555 | } | |
6e911cad | 1556 | if (ret != LTTNG_OK) { |
7076b56e | 1557 | goto error_unlock; |
6e911cad MD |
1558 | } |
1559 | break; | |
1560 | default: | |
1561 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1562 | goto error_unlock; |
2f77fc4b DG |
1563 | } |
1564 | ||
1565 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
1566 | channel_name); | |
1567 | break; | |
1568 | } | |
5cdb6027 | 1569 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1570 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1571 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1572 | { |
fefd409b | 1573 | struct agent *agt; |
f20baf8e DG |
1574 | struct ltt_ust_session *usess = session->ust_session; |
1575 | ||
1576 | assert(usess); | |
1577 | ||
6e911cad MD |
1578 | switch (event->type) { |
1579 | case LTTNG_EVENT_ALL: | |
1580 | break; | |
1581 | default: | |
1582 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1583 | goto error_unlock; |
6e911cad MD |
1584 | } |
1585 | ||
5cdb6027 | 1586 | agt = trace_ust_find_agent(usess, domain); |
fefd409b DG |
1587 | if (!agt) { |
1588 | ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
7076b56e | 1589 | goto error_unlock; |
fefd409b | 1590 | } |
b3639870 JR |
1591 | /* |
1592 | * An empty event name means that everything | |
1593 | * should be disabled. | |
1594 | */ | |
1595 | if (event->name[0] == '\0') { | |
18a720cd MD |
1596 | ret = event_agent_disable_all(usess, agt); |
1597 | } else { | |
1598 | ret = event_agent_disable(usess, agt, event_name); | |
1599 | } | |
f20baf8e | 1600 | if (ret != LTTNG_OK) { |
7076b56e | 1601 | goto error_unlock; |
f20baf8e DG |
1602 | } |
1603 | ||
1604 | break; | |
1605 | } | |
2f77fc4b | 1606 | default: |
f73fabfd | 1607 | ret = LTTNG_ERR_UND; |
7076b56e | 1608 | goto error_unlock; |
2f77fc4b DG |
1609 | } |
1610 | ||
f73fabfd | 1611 | ret = LTTNG_OK; |
2f77fc4b | 1612 | |
7076b56e | 1613 | error_unlock: |
2223c96f | 1614 | rcu_read_unlock(); |
7076b56e | 1615 | error: |
2f77fc4b DG |
1616 | return ret; |
1617 | } | |
1618 | ||
2f77fc4b DG |
1619 | /* |
1620 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1621 | */ | |
56a37563 | 1622 | int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain, |
601d5acf | 1623 | char *channel_name, struct lttng_event_context *ctx, int kwpipe) |
2f77fc4b | 1624 | { |
d5979e4a | 1625 | int ret, chan_kern_created = 0, chan_ust_created = 0; |
bdf64013 JG |
1626 | char *app_ctx_provider_name = NULL, *app_ctx_name = NULL; |
1627 | ||
1628 | if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
1629 | app_ctx_provider_name = ctx->u.app_ctx.provider_name; | |
1630 | app_ctx_name = ctx->u.app_ctx.ctx_name; | |
1631 | } | |
2f77fc4b DG |
1632 | |
1633 | switch (domain) { | |
1634 | case LTTNG_DOMAIN_KERNEL: | |
979e618e DG |
1635 | assert(session->kernel_session); |
1636 | ||
1637 | if (session->kernel_session->channel_count == 0) { | |
1638 | /* Create default channel */ | |
1639 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); | |
1640 | if (ret != LTTNG_OK) { | |
1641 | goto error; | |
1642 | } | |
d5979e4a | 1643 | chan_kern_created = 1; |
979e618e | 1644 | } |
2f77fc4b | 1645 | /* Add kernel context to kernel tracer */ |
601d5acf | 1646 | ret = context_kernel_add(session->kernel_session, ctx, channel_name); |
f73fabfd | 1647 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1648 | goto error; |
1649 | } | |
1650 | break; | |
bdf64013 JG |
1651 | case LTTNG_DOMAIN_JUL: |
1652 | case LTTNG_DOMAIN_LOG4J: | |
1653 | { | |
1654 | /* | |
1655 | * Validate channel name. | |
1656 | * If no channel name is given and the domain is JUL or LOG4J, | |
1657 | * set it to the appropriate domain-specific channel name. If | |
1658 | * a name is provided but does not match the expexted channel | |
1659 | * name, return an error. | |
1660 | */ | |
1661 | if (domain == LTTNG_DOMAIN_JUL && *channel_name && | |
1662 | strcmp(channel_name, | |
1663 | DEFAULT_JUL_CHANNEL_NAME)) { | |
1664 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1665 | goto error; | |
1666 | } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name && | |
1667 | strcmp(channel_name, | |
1668 | DEFAULT_LOG4J_CHANNEL_NAME)) { | |
1669 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1670 | goto error; | |
1671 | } | |
a93b3916 | 1672 | /* break is _not_ missing here. */ |
bdf64013 | 1673 | } |
2f77fc4b DG |
1674 | case LTTNG_DOMAIN_UST: |
1675 | { | |
1676 | struct ltt_ust_session *usess = session->ust_session; | |
85076754 MD |
1677 | unsigned int chan_count; |
1678 | ||
2f77fc4b DG |
1679 | assert(usess); |
1680 | ||
85076754 | 1681 | chan_count = lttng_ht_get_count(usess->domain_global.channels); |
979e618e DG |
1682 | if (chan_count == 0) { |
1683 | struct lttng_channel *attr; | |
1684 | /* Create default channel */ | |
0a9c6494 | 1685 | attr = channel_new_default_attr(domain, usess->buffer_type); |
979e618e DG |
1686 | if (attr == NULL) { |
1687 | ret = LTTNG_ERR_FATAL; | |
1688 | goto error; | |
1689 | } | |
1690 | ||
7972aab2 | 1691 | ret = channel_ust_create(usess, attr, usess->buffer_type); |
979e618e DG |
1692 | if (ret != LTTNG_OK) { |
1693 | free(attr); | |
1694 | goto error; | |
1695 | } | |
cf0bcb51 | 1696 | channel_attr_destroy(attr); |
d5979e4a | 1697 | chan_ust_created = 1; |
979e618e DG |
1698 | } |
1699 | ||
601d5acf | 1700 | ret = context_ust_add(usess, domain, ctx, channel_name); |
bdf64013 JG |
1701 | free(app_ctx_provider_name); |
1702 | free(app_ctx_name); | |
1703 | app_ctx_name = NULL; | |
1704 | app_ctx_provider_name = NULL; | |
f73fabfd | 1705 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1706 | goto error; |
1707 | } | |
1708 | break; | |
1709 | } | |
2f77fc4b | 1710 | default: |
f73fabfd | 1711 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1712 | goto error; |
1713 | } | |
1714 | ||
bdf64013 JG |
1715 | ret = LTTNG_OK; |
1716 | goto end; | |
2f77fc4b DG |
1717 | |
1718 | error: | |
d5979e4a DG |
1719 | if (chan_kern_created) { |
1720 | struct ltt_kernel_channel *kchan = | |
1721 | trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME, | |
1722 | session->kernel_session); | |
1723 | /* Created previously, this should NOT fail. */ | |
1724 | assert(kchan); | |
1725 | kernel_destroy_channel(kchan); | |
1726 | } | |
1727 | ||
1728 | if (chan_ust_created) { | |
1729 | struct ltt_ust_channel *uchan = | |
1730 | trace_ust_find_channel_by_name( | |
1731 | session->ust_session->domain_global.channels, | |
1732 | DEFAULT_CHANNEL_NAME); | |
1733 | /* Created previously, this should NOT fail. */ | |
1734 | assert(uchan); | |
1735 | /* Remove from the channel list of the session. */ | |
1736 | trace_ust_delete_channel(session->ust_session->domain_global.channels, | |
1737 | uchan); | |
1738 | trace_ust_destroy_channel(uchan); | |
1739 | } | |
bdf64013 JG |
1740 | end: |
1741 | free(app_ctx_provider_name); | |
1742 | free(app_ctx_name); | |
2f77fc4b DG |
1743 | return ret; |
1744 | } | |
1745 | ||
dac8e046 JG |
1746 | static inline bool name_starts_with(const char *name, const char *prefix) |
1747 | { | |
1748 | const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN); | |
1749 | ||
1750 | return !strncmp(name, prefix, max_cmp_len); | |
1751 | } | |
1752 | ||
1753 | /* Perform userspace-specific event name validation */ | |
1754 | static int validate_ust_event_name(const char *name) | |
1755 | { | |
1756 | int ret = 0; | |
1757 | ||
1758 | if (!name) { | |
1759 | ret = -1; | |
1760 | goto end; | |
1761 | } | |
1762 | ||
1763 | /* | |
1764 | * Check name against all internal UST event component namespaces used | |
1765 | * by the agents. | |
1766 | */ | |
1767 | if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) || | |
1768 | name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) || | |
1769 | name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) { | |
1770 | ret = -1; | |
1771 | } | |
1772 | ||
1773 | end: | |
1774 | return ret; | |
1775 | } | |
88f06f15 | 1776 | |
2f77fc4b | 1777 | /* |
88f06f15 JG |
1778 | * Internal version of cmd_enable_event() with a supplemental |
1779 | * "internal_event" flag which is used to enable internal events which should | |
1780 | * be hidden from clients. Such events are used in the agent implementation to | |
1781 | * enable the events through which all "agent" events are funeled. | |
2f77fc4b | 1782 | */ |
88f06f15 JG |
1783 | static int _cmd_enable_event(struct ltt_session *session, |
1784 | struct lttng_domain *domain, | |
025faf73 | 1785 | char *channel_name, struct lttng_event *event, |
6b453b5e | 1786 | char *filter_expression, |
db8f1377 JI |
1787 | struct lttng_filter_bytecode *filter, |
1788 | struct lttng_event_exclusion *exclusion, | |
88f06f15 | 1789 | int wpipe, bool internal_event) |
2f77fc4b | 1790 | { |
9f449915 | 1791 | int ret = 0, channel_created = 0; |
cfedea03 | 1792 | struct lttng_channel *attr = NULL; |
2f77fc4b DG |
1793 | |
1794 | assert(session); | |
1795 | assert(event); | |
1796 | assert(channel_name); | |
1797 | ||
2a385866 JG |
1798 | /* If we have a filter, we must have its filter expression */ |
1799 | assert(!(!!filter_expression ^ !!filter)); | |
1800 | ||
9f449915 PP |
1801 | /* Normalize event name as a globbing pattern */ |
1802 | strutils_normalize_star_glob_pattern(event->name); | |
18a720cd | 1803 | |
9f449915 PP |
1804 | /* Normalize exclusion names as globbing patterns */ |
1805 | if (exclusion) { | |
1806 | size_t i; | |
f5ac4bd7 | 1807 | |
9f449915 PP |
1808 | for (i = 0; i < exclusion->count; i++) { |
1809 | char *name = LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i); | |
1810 | ||
1811 | strutils_normalize_star_glob_pattern(name); | |
1812 | } | |
930a2e99 JG |
1813 | } |
1814 | ||
9f449915 PP |
1815 | DBG("Enable event command for event \'%s\'", event->name); |
1816 | ||
1817 | rcu_read_lock(); | |
1818 | ||
7972aab2 | 1819 | switch (domain->type) { |
2f77fc4b DG |
1820 | case LTTNG_DOMAIN_KERNEL: |
1821 | { | |
1822 | struct ltt_kernel_channel *kchan; | |
1823 | ||
85076754 MD |
1824 | /* |
1825 | * If a non-default channel has been created in the | |
1826 | * session, explicitely require that -c chan_name needs | |
1827 | * to be provided. | |
1828 | */ | |
1829 | if (session->kernel_session->has_non_default_channel | |
1830 | && channel_name[0] == '\0') { | |
1831 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1832 | goto error; | |
1833 | } | |
1834 | ||
2f77fc4b DG |
1835 | kchan = trace_kernel_get_channel_by_name(channel_name, |
1836 | session->kernel_session); | |
1837 | if (kchan == NULL) { | |
0a9c6494 DG |
1838 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
1839 | LTTNG_BUFFER_GLOBAL); | |
2f77fc4b | 1840 | if (attr == NULL) { |
f73fabfd | 1841 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1842 | goto error; |
1843 | } | |
04c17253 MD |
1844 | if (lttng_strncpy(attr->name, channel_name, |
1845 | sizeof(attr->name))) { | |
1846 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
1847 | goto error; |
1848 | } | |
2f77fc4b DG |
1849 | |
1850 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1851 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1852 | goto error; |
1853 | } | |
e5f5db7f | 1854 | channel_created = 1; |
2f77fc4b DG |
1855 | } |
1856 | ||
1857 | /* Get the newly created kernel channel pointer */ | |
1858 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1859 | session->kernel_session); | |
1860 | if (kchan == NULL) { | |
1861 | /* This sould not happen... */ | |
f73fabfd | 1862 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1863 | goto error; |
1864 | } | |
1865 | ||
6e911cad MD |
1866 | switch (event->type) { |
1867 | case LTTNG_EVENT_ALL: | |
29c62722 | 1868 | { |
00a62084 MD |
1869 | char *filter_expression_a = NULL; |
1870 | struct lttng_filter_bytecode *filter_a = NULL; | |
1871 | ||
1872 | /* | |
1873 | * We need to duplicate filter_expression and filter, | |
1874 | * because ownership is passed to first enable | |
1875 | * event. | |
1876 | */ | |
1877 | if (filter_expression) { | |
1878 | filter_expression_a = strdup(filter_expression); | |
1879 | if (!filter_expression_a) { | |
1880 | ret = LTTNG_ERR_FATAL; | |
1881 | goto error; | |
1882 | } | |
1883 | } | |
1884 | if (filter) { | |
1885 | filter_a = zmalloc(sizeof(*filter_a) + filter->len); | |
1886 | if (!filter_a) { | |
1887 | free(filter_expression_a); | |
1888 | ret = LTTNG_ERR_FATAL; | |
1889 | goto error; | |
1890 | } | |
1891 | memcpy(filter_a, filter, sizeof(*filter_a) + filter->len); | |
1892 | } | |
29c62722 | 1893 | event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */ |
00a62084 MD |
1894 | ret = event_kernel_enable_event(kchan, event, |
1895 | filter_expression, filter); | |
a969e101 MD |
1896 | /* We have passed ownership */ |
1897 | filter_expression = NULL; | |
1898 | filter = NULL; | |
29c62722 MD |
1899 | if (ret != LTTNG_OK) { |
1900 | if (channel_created) { | |
1901 | /* Let's not leak a useless channel. */ | |
1902 | kernel_destroy_channel(kchan); | |
1903 | } | |
00a62084 MD |
1904 | free(filter_expression_a); |
1905 | free(filter_a); | |
29c62722 MD |
1906 | goto error; |
1907 | } | |
1908 | event->type = LTTNG_EVENT_SYSCALL; /* Hack */ | |
00a62084 MD |
1909 | ret = event_kernel_enable_event(kchan, event, |
1910 | filter_expression_a, filter_a); | |
60d21fa2 AB |
1911 | /* We have passed ownership */ |
1912 | filter_expression_a = NULL; | |
1913 | filter_a = NULL; | |
29c62722 MD |
1914 | if (ret != LTTNG_OK) { |
1915 | goto error; | |
1916 | } | |
1917 | break; | |
1918 | } | |
6e6ef3d7 DG |
1919 | case LTTNG_EVENT_PROBE: |
1920 | case LTTNG_EVENT_FUNCTION: | |
1921 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
6e911cad | 1922 | case LTTNG_EVENT_TRACEPOINT: |
00a62084 MD |
1923 | ret = event_kernel_enable_event(kchan, event, |
1924 | filter_expression, filter); | |
a969e101 MD |
1925 | /* We have passed ownership */ |
1926 | filter_expression = NULL; | |
1927 | filter = NULL; | |
6e911cad MD |
1928 | if (ret != LTTNG_OK) { |
1929 | if (channel_created) { | |
1930 | /* Let's not leak a useless channel. */ | |
1931 | kernel_destroy_channel(kchan); | |
1932 | } | |
1933 | goto error; | |
e5f5db7f | 1934 | } |
6e911cad MD |
1935 | break; |
1936 | case LTTNG_EVENT_SYSCALL: | |
00a62084 MD |
1937 | ret = event_kernel_enable_event(kchan, event, |
1938 | filter_expression, filter); | |
a969e101 MD |
1939 | /* We have passed ownership */ |
1940 | filter_expression = NULL; | |
1941 | filter = NULL; | |
e2b957af MD |
1942 | if (ret != LTTNG_OK) { |
1943 | goto error; | |
1944 | } | |
6e911cad MD |
1945 | break; |
1946 | default: | |
1947 | ret = LTTNG_ERR_UNK; | |
2f77fc4b DG |
1948 | goto error; |
1949 | } | |
1950 | ||
1951 | kernel_wait_quiescent(kernel_tracer_fd); | |
1952 | break; | |
1953 | } | |
1954 | case LTTNG_DOMAIN_UST: | |
1955 | { | |
1956 | struct ltt_ust_channel *uchan; | |
1957 | struct ltt_ust_session *usess = session->ust_session; | |
1958 | ||
1959 | assert(usess); | |
1960 | ||
85076754 MD |
1961 | /* |
1962 | * If a non-default channel has been created in the | |
1963 | * session, explicitely require that -c chan_name needs | |
1964 | * to be provided. | |
1965 | */ | |
1966 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1967 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1968 | goto error; | |
1969 | } | |
1970 | ||
2f77fc4b DG |
1971 | /* Get channel from global UST domain */ |
1972 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
1973 | channel_name); | |
1974 | if (uchan == NULL) { | |
1975 | /* Create default channel */ | |
0a9c6494 DG |
1976 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
1977 | usess->buffer_type); | |
2f77fc4b | 1978 | if (attr == NULL) { |
f73fabfd | 1979 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1980 | goto error; |
1981 | } | |
04c17253 MD |
1982 | if (lttng_strncpy(attr->name, channel_name, |
1983 | sizeof(attr->name))) { | |
1984 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
1985 | goto error; |
1986 | } | |
2f77fc4b DG |
1987 | |
1988 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1989 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1990 | goto error; |
1991 | } | |
2f77fc4b DG |
1992 | |
1993 | /* Get the newly created channel reference back */ | |
1994 | uchan = trace_ust_find_channel_by_name( | |
1995 | usess->domain_global.channels, channel_name); | |
1996 | assert(uchan); | |
1997 | } | |
1998 | ||
141feb8c JG |
1999 | if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) { |
2000 | /* | |
2001 | * Don't allow users to add UST events to channels which | |
2002 | * are assigned to a userspace subdomain (JUL, Log4J, | |
2003 | * Python, etc.). | |
2004 | */ | |
2005 | ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN; | |
2006 | goto error; | |
2007 | } | |
2008 | ||
dac8e046 JG |
2009 | if (!internal_event) { |
2010 | /* | |
2011 | * Ensure the event name is not reserved for internal | |
2012 | * use. | |
2013 | */ | |
2014 | ret = validate_ust_event_name(event->name); | |
2015 | if (ret) { | |
2016 | WARN("Userspace event name %s failed validation.", | |
2017 | event->name ? | |
2018 | event->name : "NULL"); | |
2019 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
2020 | goto error; | |
2021 | } | |
2022 | } | |
2023 | ||
2f77fc4b | 2024 | /* At this point, the session and channel exist on the tracer */ |
6b453b5e | 2025 | ret = event_ust_enable_tracepoint(usess, uchan, event, |
88f06f15 JG |
2026 | filter_expression, filter, exclusion, |
2027 | internal_event); | |
49d21f93 MD |
2028 | /* We have passed ownership */ |
2029 | filter_expression = NULL; | |
2030 | filter = NULL; | |
2031 | exclusion = NULL; | |
94382e15 JG |
2032 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2033 | goto already_enabled; | |
2034 | } else if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2035 | goto error; |
2036 | } | |
2037 | break; | |
2038 | } | |
5cdb6027 | 2039 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 2040 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2041 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 2042 | { |
da6c3a50 | 2043 | const char *default_event_name, *default_chan_name; |
fefd409b | 2044 | struct agent *agt; |
f20baf8e DG |
2045 | struct lttng_event uevent; |
2046 | struct lttng_domain tmp_dom; | |
2047 | struct ltt_ust_session *usess = session->ust_session; | |
2048 | ||
2049 | assert(usess); | |
2050 | ||
5cdb6027 | 2051 | agt = trace_ust_find_agent(usess, domain->type); |
fefd409b | 2052 | if (!agt) { |
5cdb6027 | 2053 | agt = agent_create(domain->type); |
fefd409b | 2054 | if (!agt) { |
e5b3c48c | 2055 | ret = LTTNG_ERR_NOMEM; |
fefd409b DG |
2056 | goto error; |
2057 | } | |
2058 | agent_add(agt, usess->agents); | |
2059 | } | |
2060 | ||
022d91ba | 2061 | /* Create the default tracepoint. */ |
996de3c7 | 2062 | memset(&uevent, 0, sizeof(uevent)); |
f20baf8e DG |
2063 | uevent.type = LTTNG_EVENT_TRACEPOINT; |
2064 | uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
51755dc8 JG |
2065 | default_event_name = event_get_default_agent_ust_name( |
2066 | domain->type); | |
da6c3a50 | 2067 | if (!default_event_name) { |
e5b3c48c | 2068 | ret = LTTNG_ERR_FATAL; |
da6c3a50 | 2069 | goto error; |
f43f95a9 | 2070 | } |
da6c3a50 | 2071 | strncpy(uevent.name, default_event_name, sizeof(uevent.name)); |
f20baf8e DG |
2072 | uevent.name[sizeof(uevent.name) - 1] = '\0'; |
2073 | ||
2074 | /* | |
2075 | * The domain type is changed because we are about to enable the | |
2076 | * default channel and event for the JUL domain that are hardcoded. | |
2077 | * This happens in the UST domain. | |
2078 | */ | |
2079 | memcpy(&tmp_dom, domain, sizeof(tmp_dom)); | |
2080 | tmp_dom.type = LTTNG_DOMAIN_UST; | |
2081 | ||
0e115563 DG |
2082 | switch (domain->type) { |
2083 | case LTTNG_DOMAIN_LOG4J: | |
da6c3a50 | 2084 | default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME; |
0e115563 DG |
2085 | break; |
2086 | case LTTNG_DOMAIN_JUL: | |
da6c3a50 | 2087 | default_chan_name = DEFAULT_JUL_CHANNEL_NAME; |
0e115563 DG |
2088 | break; |
2089 | case LTTNG_DOMAIN_PYTHON: | |
2090 | default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
2091 | break; | |
2092 | default: | |
e98a44b0 | 2093 | /* The switch/case we are in makes this impossible */ |
0e115563 | 2094 | assert(0); |
da6c3a50 DG |
2095 | } |
2096 | ||
971da06a | 2097 | { |
8404118c | 2098 | char *filter_expression_copy = NULL; |
51755dc8 | 2099 | struct lttng_filter_bytecode *filter_copy = NULL; |
971da06a JG |
2100 | |
2101 | if (filter) { | |
51755dc8 JG |
2102 | const size_t filter_size = sizeof( |
2103 | struct lttng_filter_bytecode) | |
2104 | + filter->len; | |
2105 | ||
2106 | filter_copy = zmalloc(filter_size); | |
971da06a | 2107 | if (!filter_copy) { |
018096a4 | 2108 | ret = LTTNG_ERR_NOMEM; |
b742e3e2 | 2109 | goto error; |
971da06a | 2110 | } |
51755dc8 | 2111 | memcpy(filter_copy, filter, filter_size); |
971da06a | 2112 | |
8404118c JG |
2113 | filter_expression_copy = |
2114 | strdup(filter_expression); | |
2115 | if (!filter_expression) { | |
2116 | ret = LTTNG_ERR_NOMEM; | |
51755dc8 JG |
2117 | } |
2118 | ||
2119 | if (!filter_expression_copy || !filter_copy) { | |
2120 | free(filter_expression_copy); | |
2121 | free(filter_copy); | |
2122 | goto error; | |
8404118c | 2123 | } |
971da06a JG |
2124 | } |
2125 | ||
88f06f15 | 2126 | ret = cmd_enable_event_internal(session, &tmp_dom, |
971da06a | 2127 | (char *) default_chan_name, |
8404118c JG |
2128 | &uevent, filter_expression_copy, |
2129 | filter_copy, NULL, wpipe); | |
971da06a JG |
2130 | } |
2131 | ||
94382e15 JG |
2132 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2133 | goto already_enabled; | |
2134 | } else if (ret != LTTNG_OK) { | |
f20baf8e DG |
2135 | goto error; |
2136 | } | |
2137 | ||
2138 | /* The wild card * means that everything should be enabled. */ | |
2139 | if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) { | |
8404118c JG |
2140 | ret = event_agent_enable_all(usess, agt, event, filter, |
2141 | filter_expression); | |
f20baf8e | 2142 | } else { |
8404118c JG |
2143 | ret = event_agent_enable(usess, agt, event, filter, |
2144 | filter_expression); | |
f20baf8e | 2145 | } |
51755dc8 JG |
2146 | filter = NULL; |
2147 | filter_expression = NULL; | |
f20baf8e DG |
2148 | if (ret != LTTNG_OK) { |
2149 | goto error; | |
2150 | } | |
2151 | ||
2152 | break; | |
2153 | } | |
2f77fc4b | 2154 | default: |
f73fabfd | 2155 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2156 | goto error; |
2157 | } | |
2158 | ||
f73fabfd | 2159 | ret = LTTNG_OK; |
2f77fc4b | 2160 | |
94382e15 | 2161 | already_enabled: |
2f77fc4b | 2162 | error: |
49d21f93 MD |
2163 | free(filter_expression); |
2164 | free(filter); | |
2165 | free(exclusion); | |
cf0bcb51 | 2166 | channel_attr_destroy(attr); |
2223c96f | 2167 | rcu_read_unlock(); |
2f77fc4b DG |
2168 | return ret; |
2169 | } | |
2170 | ||
88f06f15 JG |
2171 | /* |
2172 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2173 | * We own filter, exclusion, and filter_expression. | |
2174 | */ | |
2175 | int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain, | |
2176 | char *channel_name, struct lttng_event *event, | |
2177 | char *filter_expression, | |
2178 | struct lttng_filter_bytecode *filter, | |
2179 | struct lttng_event_exclusion *exclusion, | |
2180 | int wpipe) | |
2181 | { | |
2182 | return _cmd_enable_event(session, domain, channel_name, event, | |
2183 | filter_expression, filter, exclusion, wpipe, false); | |
2184 | } | |
2185 | ||
2186 | /* | |
2187 | * Enable an event which is internal to LTTng. An internal should | |
2188 | * never be made visible to clients and are immune to checks such as | |
2189 | * reserved names. | |
2190 | */ | |
2191 | static int cmd_enable_event_internal(struct ltt_session *session, | |
2192 | struct lttng_domain *domain, | |
2193 | char *channel_name, struct lttng_event *event, | |
2194 | char *filter_expression, | |
2195 | struct lttng_filter_bytecode *filter, | |
2196 | struct lttng_event_exclusion *exclusion, | |
2197 | int wpipe) | |
2198 | { | |
2199 | return _cmd_enable_event(session, domain, channel_name, event, | |
2200 | filter_expression, filter, exclusion, wpipe, true); | |
2201 | } | |
2202 | ||
2f77fc4b DG |
2203 | /* |
2204 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2205 | */ | |
56a37563 JG |
2206 | ssize_t cmd_list_tracepoints(enum lttng_domain_type domain, |
2207 | struct lttng_event **events) | |
2f77fc4b DG |
2208 | { |
2209 | int ret; | |
2210 | ssize_t nb_events = 0; | |
2211 | ||
2212 | switch (domain) { | |
2213 | case LTTNG_DOMAIN_KERNEL: | |
2214 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2215 | if (nb_events < 0) { | |
f73fabfd | 2216 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
2f77fc4b DG |
2217 | goto error; |
2218 | } | |
2219 | break; | |
2220 | case LTTNG_DOMAIN_UST: | |
2221 | nb_events = ust_app_list_events(events); | |
2222 | if (nb_events < 0) { | |
f73fabfd | 2223 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2224 | goto error; |
2225 | } | |
2226 | break; | |
5cdb6027 | 2227 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2228 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2229 | case LTTNG_DOMAIN_PYTHON: |
f60140a1 | 2230 | nb_events = agent_list_events(events, domain); |
3c6a091f DG |
2231 | if (nb_events < 0) { |
2232 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2233 | goto error; | |
2234 | } | |
2235 | break; | |
2f77fc4b | 2236 | default: |
f73fabfd | 2237 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2238 | goto error; |
2239 | } | |
2240 | ||
2241 | return nb_events; | |
2242 | ||
2243 | error: | |
2244 | /* Return negative value to differentiate return code */ | |
2245 | return -ret; | |
2246 | } | |
2247 | ||
2248 | /* | |
2249 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
2250 | */ | |
56a37563 | 2251 | ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain, |
2f77fc4b DG |
2252 | struct lttng_event_field **fields) |
2253 | { | |
2254 | int ret; | |
2255 | ssize_t nb_fields = 0; | |
2256 | ||
2257 | switch (domain) { | |
2258 | case LTTNG_DOMAIN_UST: | |
2259 | nb_fields = ust_app_list_event_fields(fields); | |
2260 | if (nb_fields < 0) { | |
f73fabfd | 2261 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2262 | goto error; |
2263 | } | |
2264 | break; | |
2265 | case LTTNG_DOMAIN_KERNEL: | |
2266 | default: /* fall-through */ | |
f73fabfd | 2267 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2268 | goto error; |
2269 | } | |
2270 | ||
2271 | return nb_fields; | |
2272 | ||
2273 | error: | |
2274 | /* Return negative value to differentiate return code */ | |
2275 | return -ret; | |
2276 | } | |
2277 | ||
834978fd DG |
2278 | ssize_t cmd_list_syscalls(struct lttng_event **events) |
2279 | { | |
2280 | return syscall_table_list(events); | |
2281 | } | |
2282 | ||
a5dfbb9d MD |
2283 | /* |
2284 | * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread. | |
2285 | * | |
2286 | * Called with session lock held. | |
2287 | */ | |
2288 | ssize_t cmd_list_tracker_pids(struct ltt_session *session, | |
56a37563 | 2289 | enum lttng_domain_type domain, int32_t **pids) |
a5dfbb9d MD |
2290 | { |
2291 | int ret; | |
2292 | ssize_t nr_pids = 0; | |
2293 | ||
2294 | switch (domain) { | |
2295 | case LTTNG_DOMAIN_KERNEL: | |
2296 | { | |
2297 | struct ltt_kernel_session *ksess; | |
2298 | ||
2299 | ksess = session->kernel_session; | |
2300 | nr_pids = kernel_list_tracker_pids(ksess, pids); | |
2301 | if (nr_pids < 0) { | |
2302 | ret = LTTNG_ERR_KERN_LIST_FAIL; | |
2303 | goto error; | |
2304 | } | |
2305 | break; | |
2306 | } | |
2307 | case LTTNG_DOMAIN_UST: | |
2308 | { | |
2309 | struct ltt_ust_session *usess; | |
2310 | ||
2311 | usess = session->ust_session; | |
2312 | nr_pids = trace_ust_list_tracker_pids(usess, pids); | |
2313 | if (nr_pids < 0) { | |
2314 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2315 | goto error; | |
2316 | } | |
2317 | break; | |
2318 | } | |
2319 | case LTTNG_DOMAIN_LOG4J: | |
2320 | case LTTNG_DOMAIN_JUL: | |
2321 | case LTTNG_DOMAIN_PYTHON: | |
2322 | default: | |
2323 | ret = LTTNG_ERR_UND; | |
2324 | goto error; | |
2325 | } | |
2326 | ||
2327 | return nr_pids; | |
2328 | ||
2329 | error: | |
2330 | /* Return negative value to differentiate return code */ | |
2331 | return -ret; | |
2332 | } | |
2333 | ||
2f77fc4b DG |
2334 | /* |
2335 | * Command LTTNG_START_TRACE processed by the client thread. | |
a9ad0c8f MD |
2336 | * |
2337 | * Called with session mutex held. | |
2f77fc4b DG |
2338 | */ |
2339 | int cmd_start_trace(struct ltt_session *session) | |
2340 | { | |
2341 | int ret; | |
cde3e505 | 2342 | unsigned long nb_chan = 0; |
2f77fc4b DG |
2343 | struct ltt_kernel_session *ksession; |
2344 | struct ltt_ust_session *usess; | |
2f77fc4b DG |
2345 | |
2346 | assert(session); | |
2347 | ||
2348 | /* Ease our life a bit ;) */ | |
2349 | ksession = session->kernel_session; | |
2350 | usess = session->ust_session; | |
2351 | ||
8382cf6f DG |
2352 | /* Is the session already started? */ |
2353 | if (session->active) { | |
f73fabfd | 2354 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2355 | goto error; |
2356 | } | |
2357 | ||
cde3e505 DG |
2358 | /* |
2359 | * Starting a session without channel is useless since after that it's not | |
2360 | * possible to enable channel thus inform the client. | |
2361 | */ | |
2362 | if (usess && usess->domain_global.channels) { | |
2363 | nb_chan += lttng_ht_get_count(usess->domain_global.channels); | |
2364 | } | |
2365 | if (ksession) { | |
2366 | nb_chan += ksession->channel_count; | |
2367 | } | |
2368 | if (!nb_chan) { | |
2369 | ret = LTTNG_ERR_NO_CHANNEL; | |
2370 | goto error; | |
2371 | } | |
2372 | ||
2f77fc4b DG |
2373 | /* Kernel tracing */ |
2374 | if (ksession != NULL) { | |
9b6c7ec5 DG |
2375 | ret = start_kernel_session(ksession, kernel_tracer_fd); |
2376 | if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2377 | goto error; |
2378 | } | |
2f77fc4b DG |
2379 | } |
2380 | ||
2381 | /* Flag session that trace should start automatically */ | |
2382 | if (usess) { | |
14fb1ebe DG |
2383 | /* |
2384 | * Even though the start trace might fail, flag this session active so | |
2385 | * other application coming in are started by default. | |
2386 | */ | |
2387 | usess->active = 1; | |
2f77fc4b DG |
2388 | |
2389 | ret = ust_app_start_trace_all(usess); | |
2390 | if (ret < 0) { | |
f73fabfd | 2391 | ret = LTTNG_ERR_UST_START_FAIL; |
2f77fc4b DG |
2392 | goto error; |
2393 | } | |
2394 | } | |
2395 | ||
8382cf6f DG |
2396 | /* Flag this after a successful start. */ |
2397 | session->has_been_started = 1; | |
2398 | session->active = 1; | |
9b6c7ec5 | 2399 | |
f73fabfd | 2400 | ret = LTTNG_OK; |
2f77fc4b DG |
2401 | |
2402 | error: | |
2403 | return ret; | |
2404 | } | |
2405 | ||
2406 | /* | |
2407 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2408 | */ | |
2409 | int cmd_stop_trace(struct ltt_session *session) | |
2410 | { | |
2411 | int ret; | |
2412 | struct ltt_kernel_channel *kchan; | |
2413 | struct ltt_kernel_session *ksession; | |
2414 | struct ltt_ust_session *usess; | |
2415 | ||
2416 | assert(session); | |
2417 | ||
2418 | /* Short cut */ | |
2419 | ksession = session->kernel_session; | |
2420 | usess = session->ust_session; | |
2421 | ||
8382cf6f DG |
2422 | /* Session is not active. Skip everythong and inform the client. */ |
2423 | if (!session->active) { | |
f73fabfd | 2424 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
2f77fc4b DG |
2425 | goto error; |
2426 | } | |
2427 | ||
2f77fc4b | 2428 | /* Kernel tracer */ |
14fb1ebe | 2429 | if (ksession && ksession->active) { |
2f77fc4b DG |
2430 | DBG("Stop kernel tracing"); |
2431 | ||
566d8970 MD |
2432 | ret = kernel_stop_session(ksession); |
2433 | if (ret < 0) { | |
2434 | ret = LTTNG_ERR_KERN_STOP_FAIL; | |
2435 | goto error; | |
2436 | } | |
2437 | ||
2438 | kernel_wait_quiescent(kernel_tracer_fd); | |
2439 | ||
2440 | /* Flush metadata after stopping (if exists) */ | |
2f77fc4b DG |
2441 | if (ksession->metadata_stream_fd >= 0) { |
2442 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2443 | if (ret < 0) { | |
2444 | ERR("Kernel metadata flush failed"); | |
2445 | } | |
2446 | } | |
2447 | ||
566d8970 | 2448 | /* Flush all buffers after stopping */ |
2f77fc4b DG |
2449 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2450 | ret = kernel_flush_buffer(kchan); | |
2451 | if (ret < 0) { | |
2452 | ERR("Kernel flush buffer error"); | |
2453 | } | |
2454 | } | |
2455 | ||
14fb1ebe | 2456 | ksession->active = 0; |
2f77fc4b DG |
2457 | } |
2458 | ||
14fb1ebe DG |
2459 | if (usess && usess->active) { |
2460 | /* | |
2461 | * Even though the stop trace might fail, flag this session inactive so | |
2462 | * other application coming in are not started by default. | |
2463 | */ | |
2464 | usess->active = 0; | |
2f77fc4b DG |
2465 | |
2466 | ret = ust_app_stop_trace_all(usess); | |
2467 | if (ret < 0) { | |
f73fabfd | 2468 | ret = LTTNG_ERR_UST_STOP_FAIL; |
2f77fc4b DG |
2469 | goto error; |
2470 | } | |
2471 | } | |
2472 | ||
8382cf6f DG |
2473 | /* Flag inactive after a successful stop. */ |
2474 | session->active = 0; | |
f73fabfd | 2475 | ret = LTTNG_OK; |
2f77fc4b DG |
2476 | |
2477 | error: | |
2478 | return ret; | |
2479 | } | |
2480 | ||
2481 | /* | |
2482 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
2483 | */ | |
bda32d56 JG |
2484 | int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri, |
2485 | struct lttng_uri *uris) | |
2f77fc4b DG |
2486 | { |
2487 | int ret, i; | |
2488 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2489 | struct ltt_ust_session *usess = session->ust_session; | |
2f77fc4b DG |
2490 | |
2491 | assert(session); | |
2492 | assert(uris); | |
2493 | assert(nb_uri > 0); | |
2494 | ||
8382cf6f DG |
2495 | /* Can't set consumer URI if the session is active. */ |
2496 | if (session->active) { | |
f73fabfd | 2497 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2498 | goto error; |
2499 | } | |
2500 | ||
bda32d56 | 2501 | /* Set the "global" consumer URIs */ |
2f77fc4b | 2502 | for (i = 0; i < nb_uri; i++) { |
bda32d56 JG |
2503 | ret = add_uri_to_consumer(session->consumer, |
2504 | &uris[i], 0, session->name); | |
a74934ba | 2505 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2506 | goto error; |
2507 | } | |
2f77fc4b DG |
2508 | } |
2509 | ||
bda32d56 JG |
2510 | /* Set UST session URIs */ |
2511 | if (session->ust_session) { | |
2512 | for (i = 0; i < nb_uri; i++) { | |
2513 | ret = add_uri_to_consumer( | |
2514 | session->ust_session->consumer, | |
2515 | &uris[i], LTTNG_DOMAIN_UST, | |
2516 | session->name); | |
2517 | if (ret != LTTNG_OK) { | |
2518 | goto error; | |
2519 | } | |
2520 | } | |
2521 | } | |
2522 | ||
2523 | /* Set kernel session URIs */ | |
2524 | if (session->kernel_session) { | |
2525 | for (i = 0; i < nb_uri; i++) { | |
2526 | ret = add_uri_to_consumer( | |
2527 | session->kernel_session->consumer, | |
2528 | &uris[i], LTTNG_DOMAIN_KERNEL, | |
2529 | session->name); | |
2530 | if (ret != LTTNG_OK) { | |
2531 | goto error; | |
2532 | } | |
2533 | } | |
2534 | } | |
2535 | ||
7ab70fe0 DG |
2536 | /* |
2537 | * Make sure to set the session in output mode after we set URI since a | |
2538 | * session can be created without URL (thus flagged in no output mode). | |
2539 | */ | |
2540 | session->output_traces = 1; | |
2541 | if (ksess) { | |
2542 | ksess->output_traces = 1; | |
bda32d56 JG |
2543 | } |
2544 | ||
2545 | if (usess) { | |
7ab70fe0 DG |
2546 | usess->output_traces = 1; |
2547 | } | |
2548 | ||
2f77fc4b | 2549 | /* All good! */ |
f73fabfd | 2550 | ret = LTTNG_OK; |
2f77fc4b DG |
2551 | |
2552 | error: | |
2553 | return ret; | |
2554 | } | |
2555 | ||
2556 | /* | |
2557 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2558 | */ | |
2559 | int cmd_create_session_uri(char *name, struct lttng_uri *uris, | |
ecc48a90 | 2560 | size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer) |
2f77fc4b DG |
2561 | { |
2562 | int ret; | |
2f77fc4b DG |
2563 | struct ltt_session *session; |
2564 | ||
2565 | assert(name); | |
2bba9e53 | 2566 | assert(creds); |
785d2d0d | 2567 | |
2f77fc4b DG |
2568 | /* |
2569 | * Verify if the session already exist | |
2570 | * | |
2571 | * XXX: There is no need for the session lock list here since the caller | |
2572 | * (process_client_msg) is holding it. We might want to change that so a | |
2573 | * single command does not lock the entire session list. | |
2574 | */ | |
2575 | session = session_find_by_name(name); | |
2576 | if (session != NULL) { | |
f73fabfd | 2577 | ret = LTTNG_ERR_EXIST_SESS; |
2f77fc4b DG |
2578 | goto find_error; |
2579 | } | |
2580 | ||
2581 | /* Create tracing session in the registry */ | |
dec56f6c | 2582 | ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds), |
2f77fc4b | 2583 | LTTNG_SOCK_GET_GID_CRED(creds)); |
f73fabfd | 2584 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2585 | goto session_error; |
2586 | } | |
2587 | ||
2588 | /* | |
2589 | * Get the newly created session pointer back | |
2590 | * | |
2591 | * XXX: There is no need for the session lock list here since the caller | |
2592 | * (process_client_msg) is holding it. We might want to change that so a | |
2593 | * single command does not lock the entire session list. | |
2594 | */ | |
2595 | session = session_find_by_name(name); | |
2596 | assert(session); | |
2597 | ||
ecc48a90 | 2598 | session->live_timer = live_timer; |
2f77fc4b DG |
2599 | /* Create default consumer output for the session not yet created. */ |
2600 | session->consumer = consumer_create_output(CONSUMER_DST_LOCAL); | |
2601 | if (session->consumer == NULL) { | |
f73fabfd | 2602 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2603 | goto consumer_error; |
2604 | } | |
2605 | ||
2bba9e53 | 2606 | if (uris) { |
bda32d56 | 2607 | ret = cmd_set_consumer_uri(session, nb_uri, uris); |
2bba9e53 DG |
2608 | if (ret != LTTNG_OK) { |
2609 | goto consumer_error; | |
2610 | } | |
2611 | session->output_traces = 1; | |
2612 | } else { | |
2613 | session->output_traces = 0; | |
2614 | DBG2("Session %s created with no output", session->name); | |
2f77fc4b DG |
2615 | } |
2616 | ||
2617 | session->consumer->enabled = 1; | |
2618 | ||
f73fabfd | 2619 | return LTTNG_OK; |
2f77fc4b DG |
2620 | |
2621 | consumer_error: | |
2622 | session_destroy(session); | |
2623 | session_error: | |
2624 | find_error: | |
2625 | return ret; | |
2626 | } | |
2627 | ||
27babd3a DG |
2628 | /* |
2629 | * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread. | |
2630 | */ | |
2631 | int cmd_create_session_snapshot(char *name, struct lttng_uri *uris, | |
2632 | size_t nb_uri, lttng_sock_cred *creds) | |
2633 | { | |
2634 | int ret; | |
2635 | struct ltt_session *session; | |
2636 | struct snapshot_output *new_output = NULL; | |
2637 | ||
2638 | assert(name); | |
2639 | assert(creds); | |
2640 | ||
2641 | /* | |
2642 | * Create session in no output mode with URIs set to NULL. The uris we've | |
2643 | * received are for a default snapshot output if one. | |
2644 | */ | |
ae58b817 | 2645 | ret = cmd_create_session_uri(name, NULL, 0, creds, 0); |
27babd3a DG |
2646 | if (ret != LTTNG_OK) { |
2647 | goto error; | |
2648 | } | |
2649 | ||
2650 | /* Get the newly created session pointer back. This should NEVER fail. */ | |
2651 | session = session_find_by_name(name); | |
2652 | assert(session); | |
2653 | ||
2654 | /* Flag session for snapshot mode. */ | |
2655 | session->snapshot_mode = 1; | |
2656 | ||
2657 | /* Skip snapshot output creation if no URI is given. */ | |
2658 | if (nb_uri == 0) { | |
2659 | goto end; | |
2660 | } | |
2661 | ||
2662 | new_output = snapshot_output_alloc(); | |
2663 | if (!new_output) { | |
2664 | ret = LTTNG_ERR_NOMEM; | |
2665 | goto error_snapshot_alloc; | |
2666 | } | |
2667 | ||
2668 | ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL, | |
2669 | uris, nb_uri, session->consumer, new_output, &session->snapshot); | |
2670 | if (ret < 0) { | |
2671 | if (ret == -ENOMEM) { | |
2672 | ret = LTTNG_ERR_NOMEM; | |
2673 | } else { | |
2674 | ret = LTTNG_ERR_INVALID; | |
2675 | } | |
2676 | goto error_snapshot; | |
2677 | } | |
2678 | ||
2679 | rcu_read_lock(); | |
2680 | snapshot_add_output(&session->snapshot, new_output); | |
2681 | rcu_read_unlock(); | |
2682 | ||
2683 | end: | |
2684 | return LTTNG_OK; | |
2685 | ||
2686 | error_snapshot: | |
2687 | snapshot_output_destroy(new_output); | |
2688 | error_snapshot_alloc: | |
2689 | session_destroy(session); | |
2690 | error: | |
2691 | return ret; | |
2692 | } | |
2693 | ||
2f77fc4b DG |
2694 | /* |
2695 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
a9ad0c8f MD |
2696 | * |
2697 | * Called with session lock held. | |
2f77fc4b DG |
2698 | */ |
2699 | int cmd_destroy_session(struct ltt_session *session, int wpipe) | |
2700 | { | |
2701 | int ret; | |
2702 | struct ltt_ust_session *usess; | |
2703 | struct ltt_kernel_session *ksess; | |
2704 | ||
2705 | /* Safety net */ | |
2706 | assert(session); | |
2707 | ||
2708 | usess = session->ust_session; | |
2709 | ksess = session->kernel_session; | |
2710 | ||
2711 | /* Clean kernel session teardown */ | |
2712 | kernel_destroy_session(ksess); | |
2713 | ||
2714 | /* UST session teardown */ | |
2715 | if (usess) { | |
2716 | /* Close any relayd session */ | |
2717 | consumer_output_send_destroy_relayd(usess->consumer); | |
2718 | ||
2719 | /* Destroy every UST application related to this session. */ | |
2720 | ret = ust_app_destroy_trace_all(usess); | |
2721 | if (ret) { | |
2722 | ERR("Error in ust_app_destroy_trace_all"); | |
2723 | } | |
2724 | ||
2725 | /* Clean up the rest. */ | |
2726 | trace_ust_destroy_session(usess); | |
2727 | } | |
2728 | ||
2729 | /* | |
2730 | * Must notify the kernel thread here to update it's poll set in order to | |
2731 | * remove the channel(s)' fd just destroyed. | |
2732 | */ | |
2733 | ret = notify_thread_pipe(wpipe); | |
2734 | if (ret < 0) { | |
2735 | PERROR("write kernel poll pipe"); | |
2736 | } | |
2737 | ||
2738 | ret = session_destroy(session); | |
2739 | ||
2740 | return ret; | |
2741 | } | |
2742 | ||
2f77fc4b DG |
2743 | /* |
2744 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
2745 | */ | |
56a37563 JG |
2746 | int cmd_register_consumer(struct ltt_session *session, |
2747 | enum lttng_domain_type domain, const char *sock_path, | |
2748 | struct consumer_data *cdata) | |
2f77fc4b DG |
2749 | { |
2750 | int ret, sock; | |
dd81b457 | 2751 | struct consumer_socket *socket = NULL; |
2f77fc4b DG |
2752 | |
2753 | assert(session); | |
2754 | assert(cdata); | |
2755 | assert(sock_path); | |
2756 | ||
2757 | switch (domain) { | |
2758 | case LTTNG_DOMAIN_KERNEL: | |
2759 | { | |
2760 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2761 | ||
2762 | assert(ksess); | |
2763 | ||
2764 | /* Can't register a consumer if there is already one */ | |
2765 | if (ksess->consumer_fds_sent != 0) { | |
f73fabfd | 2766 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
2767 | goto error; |
2768 | } | |
2769 | ||
2770 | sock = lttcomm_connect_unix_sock(sock_path); | |
2771 | if (sock < 0) { | |
f73fabfd | 2772 | ret = LTTNG_ERR_CONNECT_FAIL; |
2f77fc4b DG |
2773 | goto error; |
2774 | } | |
4ce514c4 | 2775 | cdata->cmd_sock = sock; |
2f77fc4b | 2776 | |
4ce514c4 | 2777 | socket = consumer_allocate_socket(&cdata->cmd_sock); |
2f77fc4b | 2778 | if (socket == NULL) { |
f66c074c DG |
2779 | ret = close(sock); |
2780 | if (ret < 0) { | |
2781 | PERROR("close register consumer"); | |
2782 | } | |
4ce514c4 | 2783 | cdata->cmd_sock = -1; |
f73fabfd | 2784 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2785 | goto error; |
2786 | } | |
2787 | ||
2788 | socket->lock = zmalloc(sizeof(pthread_mutex_t)); | |
2789 | if (socket->lock == NULL) { | |
2790 | PERROR("zmalloc pthread mutex"); | |
f73fabfd | 2791 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2792 | goto error; |
2793 | } | |
2794 | pthread_mutex_init(socket->lock, NULL); | |
2795 | socket->registered = 1; | |
2796 | ||
2797 | rcu_read_lock(); | |
2798 | consumer_add_socket(socket, ksess->consumer); | |
2799 | rcu_read_unlock(); | |
2800 | ||
2801 | pthread_mutex_lock(&cdata->pid_mutex); | |
2802 | cdata->pid = -1; | |
2803 | pthread_mutex_unlock(&cdata->pid_mutex); | |
2804 | ||
2805 | break; | |
2806 | } | |
2807 | default: | |
2808 | /* TODO: Userspace tracing */ | |
f73fabfd | 2809 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2810 | goto error; |
2811 | } | |
2812 | ||
dd81b457 | 2813 | return LTTNG_OK; |
2f77fc4b DG |
2814 | |
2815 | error: | |
dd81b457 DG |
2816 | if (socket) { |
2817 | consumer_destroy_socket(socket); | |
2818 | } | |
2f77fc4b DG |
2819 | return ret; |
2820 | } | |
2821 | ||
2822 | /* | |
2823 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
2824 | */ | |
2825 | ssize_t cmd_list_domains(struct ltt_session *session, | |
2826 | struct lttng_domain **domains) | |
2827 | { | |
2828 | int ret, index = 0; | |
2829 | ssize_t nb_dom = 0; | |
fefd409b DG |
2830 | struct agent *agt; |
2831 | struct lttng_ht_iter iter; | |
2f77fc4b DG |
2832 | |
2833 | if (session->kernel_session != NULL) { | |
2834 | DBG3("Listing domains found kernel domain"); | |
2835 | nb_dom++; | |
2836 | } | |
2837 | ||
2838 | if (session->ust_session != NULL) { | |
2839 | DBG3("Listing domains found UST global domain"); | |
2840 | nb_dom++; | |
3c6a091f | 2841 | |
e0a74f01 | 2842 | rcu_read_lock(); |
fefd409b DG |
2843 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2844 | agt, node.node) { | |
2845 | if (agt->being_used) { | |
2846 | nb_dom++; | |
2847 | } | |
3c6a091f | 2848 | } |
e0a74f01 | 2849 | rcu_read_unlock(); |
2f77fc4b DG |
2850 | } |
2851 | ||
fa64dfb4 JG |
2852 | if (!nb_dom) { |
2853 | goto end; | |
2854 | } | |
2855 | ||
2f77fc4b DG |
2856 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
2857 | if (*domains == NULL) { | |
f73fabfd | 2858 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2859 | goto error; |
2860 | } | |
2861 | ||
2862 | if (session->kernel_session != NULL) { | |
2863 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
b5edb9e8 PP |
2864 | |
2865 | /* Kernel session buffer type is always GLOBAL */ | |
2866 | (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL; | |
2867 | ||
2f77fc4b DG |
2868 | index++; |
2869 | } | |
2870 | ||
2871 | if (session->ust_session != NULL) { | |
2872 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
88c5f0d8 | 2873 | (*domains)[index].buf_type = session->ust_session->buffer_type; |
2f77fc4b | 2874 | index++; |
3c6a091f | 2875 | |
e0a74f01 | 2876 | rcu_read_lock(); |
fefd409b DG |
2877 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2878 | agt, node.node) { | |
2879 | if (agt->being_used) { | |
2880 | (*domains)[index].type = agt->domain; | |
2881 | (*domains)[index].buf_type = session->ust_session->buffer_type; | |
2882 | index++; | |
2883 | } | |
3c6a091f | 2884 | } |
e0a74f01 | 2885 | rcu_read_unlock(); |
2f77fc4b | 2886 | } |
fa64dfb4 | 2887 | end: |
2f77fc4b DG |
2888 | return nb_dom; |
2889 | ||
2890 | error: | |
f73fabfd DG |
2891 | /* Return negative value to differentiate return code */ |
2892 | return -ret; | |
2f77fc4b DG |
2893 | } |
2894 | ||
2895 | ||
2896 | /* | |
2897 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
2898 | */ | |
56a37563 JG |
2899 | ssize_t cmd_list_channels(enum lttng_domain_type domain, |
2900 | struct ltt_session *session, struct lttng_channel **channels) | |
2f77fc4b | 2901 | { |
53e367f9 | 2902 | ssize_t nb_chan = 0, payload_size = 0, ret; |
2f77fc4b DG |
2903 | |
2904 | switch (domain) { | |
2905 | case LTTNG_DOMAIN_KERNEL: | |
2906 | if (session->kernel_session != NULL) { | |
2907 | nb_chan = session->kernel_session->channel_count; | |
2908 | } | |
2909 | DBG3("Number of kernel channels %zd", nb_chan); | |
c7d620a2 | 2910 | if (nb_chan <= 0) { |
53e367f9 JG |
2911 | ret = -LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2912 | goto end; | |
c7d620a2 | 2913 | } |
2f77fc4b DG |
2914 | break; |
2915 | case LTTNG_DOMAIN_UST: | |
2916 | if (session->ust_session != NULL) { | |
7ffc31a2 | 2917 | rcu_read_lock(); |
2f77fc4b | 2918 | nb_chan = lttng_ht_get_count( |
7ffc31a2 JG |
2919 | session->ust_session->domain_global.channels); |
2920 | rcu_read_unlock(); | |
2f77fc4b DG |
2921 | } |
2922 | DBG3("Number of UST global channels %zd", nb_chan); | |
ade7ce52 | 2923 | if (nb_chan < 0) { |
53e367f9 JG |
2924 | ret = -LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2925 | goto end; | |
c7d620a2 | 2926 | } |
2f77fc4b DG |
2927 | break; |
2928 | default: | |
53e367f9 JG |
2929 | ret = -LTTNG_ERR_UND; |
2930 | goto end; | |
2f77fc4b DG |
2931 | } |
2932 | ||
2933 | if (nb_chan > 0) { | |
53e367f9 | 2934 | const size_t channel_size = sizeof(struct lttng_channel) + |
cf0bcb51 JG |
2935 | sizeof(struct lttng_channel_extended); |
2936 | struct lttng_channel_extended *channel_exts; | |
53e367f9 JG |
2937 | |
2938 | payload_size = nb_chan * channel_size; | |
2939 | *channels = zmalloc(payload_size); | |
2f77fc4b | 2940 | if (*channels == NULL) { |
53e367f9 JG |
2941 | ret = -LTTNG_ERR_FATAL; |
2942 | goto end; | |
2f77fc4b DG |
2943 | } |
2944 | ||
53e367f9 JG |
2945 | channel_exts = ((void *) *channels) + |
2946 | (nb_chan * sizeof(struct lttng_channel)); | |
d449df4a MD |
2947 | ret = list_lttng_channels(domain, session, *channels, channel_exts); |
2948 | if (ret != LTTNG_OK) { | |
2949 | free(*channels); | |
2950 | *channels = NULL; | |
2951 | goto end; | |
2952 | } | |
53e367f9 JG |
2953 | } else { |
2954 | *channels = NULL; | |
2f77fc4b DG |
2955 | } |
2956 | ||
53e367f9 JG |
2957 | ret = payload_size; |
2958 | end: | |
2959 | return ret; | |
2f77fc4b DG |
2960 | } |
2961 | ||
2962 | /* | |
2963 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
2964 | */ | |
56a37563 JG |
2965 | ssize_t cmd_list_events(enum lttng_domain_type domain, |
2966 | struct ltt_session *session, char *channel_name, | |
b4e3ceb9 | 2967 | struct lttng_event **events, size_t *total_size) |
2f77fc4b DG |
2968 | { |
2969 | int ret = 0; | |
2970 | ssize_t nb_event = 0; | |
2971 | ||
2972 | switch (domain) { | |
2973 | case LTTNG_DOMAIN_KERNEL: | |
2974 | if (session->kernel_session != NULL) { | |
2975 | nb_event = list_lttng_kernel_events(channel_name, | |
b4e3ceb9 PP |
2976 | session->kernel_session, events, |
2977 | total_size); | |
2f77fc4b DG |
2978 | } |
2979 | break; | |
2980 | case LTTNG_DOMAIN_UST: | |
2981 | { | |
2982 | if (session->ust_session != NULL) { | |
2983 | nb_event = list_lttng_ust_global_events(channel_name, | |
b4e3ceb9 PP |
2984 | &session->ust_session->domain_global, events, |
2985 | total_size); | |
2f77fc4b DG |
2986 | } |
2987 | break; | |
2988 | } | |
5cdb6027 | 2989 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2990 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2991 | case LTTNG_DOMAIN_PYTHON: |
3c6a091f | 2992 | if (session->ust_session) { |
fefd409b DG |
2993 | struct lttng_ht_iter iter; |
2994 | struct agent *agt; | |
2995 | ||
b11feea5 | 2996 | rcu_read_lock(); |
fefd409b DG |
2997 | cds_lfht_for_each_entry(session->ust_session->agents->ht, |
2998 | &iter.iter, agt, node.node) { | |
1dfd9906 JG |
2999 | if (agt->domain == domain) { |
3000 | nb_event = list_lttng_agent_events( | |
b4e3ceb9 PP |
3001 | agt, events, |
3002 | total_size); | |
1dfd9906 JG |
3003 | break; |
3004 | } | |
fefd409b | 3005 | } |
b11feea5 | 3006 | rcu_read_unlock(); |
3c6a091f DG |
3007 | } |
3008 | break; | |
2f77fc4b | 3009 | default: |
f73fabfd | 3010 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3011 | goto error; |
3012 | } | |
3013 | ||
f73fabfd | 3014 | return nb_event; |
2f77fc4b DG |
3015 | |
3016 | error: | |
f73fabfd DG |
3017 | /* Return negative value to differentiate return code */ |
3018 | return -ret; | |
2f77fc4b DG |
3019 | } |
3020 | ||
3021 | /* | |
3022 | * Using the session list, filled a lttng_session array to send back to the | |
3023 | * client for session listing. | |
3024 | * | |
3025 | * The session list lock MUST be acquired before calling this function. Use | |
3026 | * session_lock_list() and session_unlock_list(). | |
3027 | */ | |
3028 | void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid, | |
3029 | gid_t gid) | |
3030 | { | |
3031 | int ret; | |
3032 | unsigned int i = 0; | |
3033 | struct ltt_session *session; | |
3034 | struct ltt_session_list *list = session_get_list(); | |
3035 | ||
3036 | DBG("Getting all available session for UID %d GID %d", | |
3037 | uid, gid); | |
3038 | /* | |
3039 | * Iterate over session list and append data after the control struct in | |
3040 | * the buffer. | |
3041 | */ | |
3042 | cds_list_for_each_entry(session, &list->head, list) { | |
3043 | /* | |
3044 | * Only list the sessions the user can control. | |
3045 | */ | |
3046 | if (!session_access_ok(session, uid, gid)) { | |
3047 | continue; | |
3048 | } | |
3049 | ||
3050 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3051 | struct ltt_ust_session *usess = session->ust_session; | |
3052 | ||
3053 | if (session->consumer->type == CONSUMER_DST_NET || | |
3054 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
3055 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
3056 | ret = build_network_session_path(sessions[i].path, | |
dec56f6c | 3057 | sizeof(sessions[i].path), session); |
2f77fc4b | 3058 | } else { |
dec56f6c | 3059 | ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s", |
2f77fc4b DG |
3060 | session->consumer->dst.trace_path); |
3061 | } | |
3062 | if (ret < 0) { | |
3063 | PERROR("snprintf session path"); | |
3064 | continue; | |
3065 | } | |
3066 | ||
3067 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
3068 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
8382cf6f | 3069 | sessions[i].enabled = session->active; |
2cbf8fed | 3070 | sessions[i].snapshot_mode = session->snapshot_mode; |
8960e9cd | 3071 | sessions[i].live_timer_interval = session->live_timer; |
2f77fc4b DG |
3072 | i++; |
3073 | } | |
3074 | } | |
3075 | ||
806e2684 | 3076 | /* |
6d805429 | 3077 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
d3f14b8a | 3078 | * ready for trace analysis (or any kind of reader) or else 1 for pending data. |
806e2684 | 3079 | */ |
6d805429 | 3080 | int cmd_data_pending(struct ltt_session *session) |
806e2684 DG |
3081 | { |
3082 | int ret; | |
3083 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3084 | struct ltt_ust_session *usess = session->ust_session; | |
3085 | ||
3086 | assert(session); | |
3087 | ||
3088 | /* Session MUST be stopped to ask for data availability. */ | |
8382cf6f | 3089 | if (session->active) { |
806e2684 DG |
3090 | ret = LTTNG_ERR_SESSION_STARTED; |
3091 | goto error; | |
3a89d11a DG |
3092 | } else { |
3093 | /* | |
3094 | * If stopped, just make sure we've started before else the above call | |
3095 | * will always send that there is data pending. | |
3096 | * | |
3097 | * The consumer assumes that when the data pending command is received, | |
3098 | * the trace has been started before or else no output data is written | |
3099 | * by the streams which is a condition for data pending. So, this is | |
3100 | * *VERY* important that we don't ask the consumer before a start | |
3101 | * trace. | |
3102 | */ | |
8382cf6f | 3103 | if (!session->has_been_started) { |
3a89d11a DG |
3104 | ret = 0; |
3105 | goto error; | |
3106 | } | |
806e2684 DG |
3107 | } |
3108 | ||
3109 | if (ksess && ksess->consumer) { | |
6d805429 DG |
3110 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
3111 | if (ret == 1) { | |
806e2684 DG |
3112 | /* Data is still being extracted for the kernel. */ |
3113 | goto error; | |
3114 | } | |
3115 | } | |
3116 | ||
3117 | if (usess && usess->consumer) { | |
6d805429 DG |
3118 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
3119 | if (ret == 1) { | |
806e2684 DG |
3120 | /* Data is still being extracted for the kernel. */ |
3121 | goto error; | |
3122 | } | |
3123 | } | |
3124 | ||
3125 | /* Data is ready to be read by a viewer */ | |
6d805429 | 3126 | ret = 0; |
806e2684 DG |
3127 | |
3128 | error: | |
3129 | return ret; | |
3130 | } | |
3131 | ||
6dc3064a DG |
3132 | /* |
3133 | * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library. | |
3134 | * | |
3135 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3136 | */ | |
3137 | int cmd_snapshot_add_output(struct ltt_session *session, | |
3138 | struct lttng_snapshot_output *output, uint32_t *id) | |
3139 | { | |
3140 | int ret; | |
3141 | struct snapshot_output *new_output; | |
3142 | ||
3143 | assert(session); | |
3144 | assert(output); | |
3145 | ||
3146 | DBG("Cmd snapshot add output for session %s", session->name); | |
3147 | ||
3148 | /* | |
903ef685 | 3149 | * Can't create an output if the session is not set in no-output mode. |
6dc3064a DG |
3150 | */ |
3151 | if (session->output_traces) { | |
903ef685 | 3152 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3153 | goto error; |
3154 | } | |
3155 | ||
3156 | /* Only one output is allowed until we have the "tee" feature. */ | |
3157 | if (session->snapshot.nb_output == 1) { | |
3158 | ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST; | |
3159 | goto error; | |
3160 | } | |
3161 | ||
3162 | new_output = snapshot_output_alloc(); | |
3163 | if (!new_output) { | |
3164 | ret = LTTNG_ERR_NOMEM; | |
3165 | goto error; | |
3166 | } | |
3167 | ||
3168 | ret = snapshot_output_init(output->max_size, output->name, | |
3169 | output->ctrl_url, output->data_url, session->consumer, new_output, | |
3170 | &session->snapshot); | |
3171 | if (ret < 0) { | |
3172 | if (ret == -ENOMEM) { | |
3173 | ret = LTTNG_ERR_NOMEM; | |
3174 | } else { | |
3175 | ret = LTTNG_ERR_INVALID; | |
3176 | } | |
3177 | goto free_error; | |
3178 | } | |
3179 | ||
6dc3064a DG |
3180 | rcu_read_lock(); |
3181 | snapshot_add_output(&session->snapshot, new_output); | |
3182 | if (id) { | |
3183 | *id = new_output->id; | |
3184 | } | |
3185 | rcu_read_unlock(); | |
3186 | ||
3187 | return LTTNG_OK; | |
3188 | ||
3189 | free_error: | |
3190 | snapshot_output_destroy(new_output); | |
3191 | error: | |
3192 | return ret; | |
3193 | } | |
3194 | ||
3195 | /* | |
3196 | * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl. | |
3197 | * | |
3198 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3199 | */ | |
3200 | int cmd_snapshot_del_output(struct ltt_session *session, | |
3201 | struct lttng_snapshot_output *output) | |
3202 | { | |
3203 | int ret; | |
eb240553 | 3204 | struct snapshot_output *sout = NULL; |
6dc3064a DG |
3205 | |
3206 | assert(session); | |
3207 | assert(output); | |
3208 | ||
6dc3064a DG |
3209 | rcu_read_lock(); |
3210 | ||
3211 | /* | |
d3f14b8a MD |
3212 | * Permission denied to create an output if the session is not |
3213 | * set in no output mode. | |
6dc3064a DG |
3214 | */ |
3215 | if (session->output_traces) { | |
903ef685 | 3216 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3217 | goto error; |
3218 | } | |
3219 | ||
eb240553 DG |
3220 | if (output->id) { |
3221 | DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id, | |
3222 | session->name); | |
3223 | sout = snapshot_find_output_by_id(output->id, &session->snapshot); | |
3224 | } else if (*output->name != '\0') { | |
3225 | DBG("Cmd snapshot del output name %s for session %s", output->name, | |
3226 | session->name); | |
3227 | sout = snapshot_find_output_by_name(output->name, &session->snapshot); | |
3228 | } | |
6dc3064a DG |
3229 | if (!sout) { |
3230 | ret = LTTNG_ERR_INVALID; | |
3231 | goto error; | |
3232 | } | |
3233 | ||
3234 | snapshot_delete_output(&session->snapshot, sout); | |
3235 | snapshot_output_destroy(sout); | |
3236 | ret = LTTNG_OK; | |
3237 | ||
3238 | error: | |
3239 | rcu_read_unlock(); | |
3240 | return ret; | |
3241 | } | |
3242 | ||
3243 | /* | |
3244 | * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl. | |
3245 | * | |
3246 | * If no output is available, outputs is untouched and 0 is returned. | |
3247 | * | |
3248 | * Return the size of the newly allocated outputs or a negative LTTNG_ERR code. | |
3249 | */ | |
3250 | ssize_t cmd_snapshot_list_outputs(struct ltt_session *session, | |
3251 | struct lttng_snapshot_output **outputs) | |
3252 | { | |
3253 | int ret, idx = 0; | |
b223ca94 | 3254 | struct lttng_snapshot_output *list = NULL; |
6dc3064a DG |
3255 | struct lttng_ht_iter iter; |
3256 | struct snapshot_output *output; | |
3257 | ||
3258 | assert(session); | |
3259 | assert(outputs); | |
3260 | ||
3261 | DBG("Cmd snapshot list outputs for session %s", session->name); | |
3262 | ||
3263 | /* | |
d3f14b8a MD |
3264 | * Permission denied to create an output if the session is not |
3265 | * set in no output mode. | |
6dc3064a DG |
3266 | */ |
3267 | if (session->output_traces) { | |
903ef685 JG |
3268 | ret = -LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
3269 | goto end; | |
6dc3064a DG |
3270 | } |
3271 | ||
3272 | if (session->snapshot.nb_output == 0) { | |
3273 | ret = 0; | |
903ef685 | 3274 | goto end; |
6dc3064a DG |
3275 | } |
3276 | ||
3277 | list = zmalloc(session->snapshot.nb_output * sizeof(*list)); | |
3278 | if (!list) { | |
b223ca94 | 3279 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3280 | goto end; |
6dc3064a DG |
3281 | } |
3282 | ||
3283 | /* Copy list from session to the new list object. */ | |
b223ca94 | 3284 | rcu_read_lock(); |
6dc3064a DG |
3285 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter, |
3286 | output, node.node) { | |
3287 | assert(output->consumer); | |
3288 | list[idx].id = output->id; | |
3289 | list[idx].max_size = output->max_size; | |
6ce22875 MD |
3290 | if (lttng_strncpy(list[idx].name, output->name, |
3291 | sizeof(list[idx].name))) { | |
3292 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 3293 | goto error; |
6ce22875 | 3294 | } |
6dc3064a | 3295 | if (output->consumer->type == CONSUMER_DST_LOCAL) { |
6ce22875 MD |
3296 | if (lttng_strncpy(list[idx].ctrl_url, |
3297 | output->consumer->dst.trace_path, | |
3298 | sizeof(list[idx].ctrl_url))) { | |
3299 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 3300 | goto error; |
6ce22875 | 3301 | } |
6dc3064a DG |
3302 | } else { |
3303 | /* Control URI. */ | |
3304 | ret = uri_to_str_url(&output->consumer->dst.net.control, | |
3305 | list[idx].ctrl_url, sizeof(list[idx].ctrl_url)); | |
3306 | if (ret < 0) { | |
b223ca94 | 3307 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3308 | goto error; |
6dc3064a DG |
3309 | } |
3310 | ||
3311 | /* Data URI. */ | |
3312 | ret = uri_to_str_url(&output->consumer->dst.net.data, | |
3313 | list[idx].data_url, sizeof(list[idx].data_url)); | |
3314 | if (ret < 0) { | |
b223ca94 | 3315 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3316 | goto error; |
6dc3064a DG |
3317 | } |
3318 | } | |
3319 | idx++; | |
3320 | } | |
3321 | ||
3322 | *outputs = list; | |
b223ca94 JG |
3323 | list = NULL; |
3324 | ret = session->snapshot.nb_output; | |
6dc3064a | 3325 | error: |
903ef685 | 3326 | rcu_read_unlock(); |
b223ca94 | 3327 | free(list); |
903ef685 | 3328 | end: |
b223ca94 | 3329 | return ret; |
6dc3064a DG |
3330 | } |
3331 | ||
93ec662e JD |
3332 | /* |
3333 | * Check if we can regenerate the metadata for this session. | |
3334 | * Only kernel, UST per-uid and non-live sessions are supported. | |
3335 | * | |
3336 | * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise. | |
3337 | */ | |
3338 | static | |
eded6438 | 3339 | int check_regenerate_metadata_support(struct ltt_session *session) |
93ec662e JD |
3340 | { |
3341 | int ret; | |
3342 | ||
3343 | assert(session); | |
3344 | ||
3345 | if (session->live_timer != 0) { | |
3346 | ret = LTTNG_ERR_LIVE_SESSION; | |
3347 | goto end; | |
3348 | } | |
3349 | if (!session->active) { | |
3350 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
3351 | goto end; | |
3352 | } | |
3353 | if (session->ust_session) { | |
3354 | switch (session->ust_session->buffer_type) { | |
3355 | case LTTNG_BUFFER_PER_UID: | |
3356 | break; | |
3357 | case LTTNG_BUFFER_PER_PID: | |
3358 | ret = LTTNG_ERR_PER_PID_SESSION; | |
3359 | goto end; | |
3360 | default: | |
3361 | assert(0); | |
3362 | ret = LTTNG_ERR_UNK; | |
3363 | goto end; | |
3364 | } | |
3365 | } | |
3366 | if (session->consumer->type == CONSUMER_DST_NET && | |
3367 | session->consumer->relay_minor_version < 8) { | |
3368 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; | |
3369 | goto end; | |
3370 | } | |
3371 | ret = 0; | |
3372 | ||
3373 | end: | |
3374 | return ret; | |
3375 | } | |
3376 | ||
7802bae3 LL |
3377 | static |
3378 | int clear_metadata_file(int fd) | |
3379 | { | |
3380 | int ret; | |
3381 | ||
3382 | ret = lseek(fd, 0, SEEK_SET); | |
3383 | if (ret < 0) { | |
3384 | PERROR("lseek"); | |
3385 | goto end; | |
3386 | } | |
3387 | ||
3388 | ret = ftruncate(fd, 0); | |
3389 | if (ret < 0) { | |
3390 | PERROR("ftruncate"); | |
3391 | goto end; | |
3392 | } | |
3393 | ||
3394 | end: | |
3395 | return ret; | |
3396 | } | |
3397 | ||
93ec662e | 3398 | static |
eded6438 | 3399 | int ust_regenerate_metadata(struct ltt_ust_session *usess) |
93ec662e JD |
3400 | { |
3401 | int ret = 0; | |
3402 | struct buffer_reg_uid *uid_reg = NULL; | |
3403 | struct buffer_reg_session *session_reg = NULL; | |
3404 | ||
3405 | rcu_read_lock(); | |
3406 | cds_list_for_each_entry(uid_reg, &usess->buffer_reg_uid_list, lnode) { | |
3407 | struct ust_registry_session *registry; | |
3408 | struct ust_registry_channel *chan; | |
3409 | struct lttng_ht_iter iter_chan; | |
3410 | ||
3411 | session_reg = uid_reg->registry; | |
3412 | registry = session_reg->reg.ust; | |
3413 | ||
3414 | pthread_mutex_lock(®istry->lock); | |
3415 | registry->metadata_len_sent = 0; | |
3416 | memset(registry->metadata, 0, registry->metadata_alloc_len); | |
3417 | registry->metadata_len = 0; | |
3418 | registry->metadata_version++; | |
7802bae3 LL |
3419 | if (registry->metadata_fd > 0) { |
3420 | /* Clear the metadata file's content. */ | |
3421 | ret = clear_metadata_file(registry->metadata_fd); | |
3422 | if (ret) { | |
3423 | pthread_mutex_unlock(®istry->lock); | |
3424 | goto end; | |
3425 | } | |
3426 | } | |
3427 | ||
93ec662e JD |
3428 | ret = ust_metadata_session_statedump(registry, NULL, |
3429 | registry->major, registry->minor); | |
3430 | if (ret) { | |
3431 | pthread_mutex_unlock(®istry->lock); | |
3432 | ERR("Failed to generate session metadata (err = %d)", | |
3433 | ret); | |
3434 | goto end; | |
3435 | } | |
3436 | cds_lfht_for_each_entry(registry->channels->ht, &iter_chan.iter, | |
3437 | chan, node.node) { | |
3438 | struct ust_registry_event *event; | |
3439 | struct lttng_ht_iter iter_event; | |
3440 | ||
3441 | ret = ust_metadata_channel_statedump(registry, chan); | |
3442 | if (ret) { | |
3443 | pthread_mutex_unlock(®istry->lock); | |
3444 | ERR("Failed to generate channel metadata " | |
3445 | "(err = %d)", ret); | |
3446 | goto end; | |
3447 | } | |
3448 | cds_lfht_for_each_entry(chan->ht->ht, &iter_event.iter, | |
3449 | event, node.node) { | |
3450 | ret = ust_metadata_event_statedump(registry, | |
3451 | chan, event); | |
3452 | if (ret) { | |
3453 | pthread_mutex_unlock(®istry->lock); | |
3454 | ERR("Failed to generate event metadata " | |
3455 | "(err = %d)", ret); | |
3456 | goto end; | |
3457 | } | |
3458 | } | |
3459 | } | |
3460 | pthread_mutex_unlock(®istry->lock); | |
3461 | } | |
3462 | ||
3463 | end: | |
3464 | rcu_read_unlock(); | |
3465 | return ret; | |
3466 | } | |
3467 | ||
3468 | /* | |
eded6438 | 3469 | * Command LTTNG_REGENERATE_METADATA from the lttng-ctl library. |
93ec662e JD |
3470 | * |
3471 | * Ask the consumer to truncate the existing metadata file(s) and | |
3472 | * then regenerate the metadata. Live and per-pid sessions are not | |
3473 | * supported and return an error. | |
3474 | * | |
3475 | * Return 0 on success or else a LTTNG_ERR code. | |
3476 | */ | |
eded6438 | 3477 | int cmd_regenerate_metadata(struct ltt_session *session) |
93ec662e JD |
3478 | { |
3479 | int ret; | |
3480 | ||
3481 | assert(session); | |
3482 | ||
eded6438 | 3483 | ret = check_regenerate_metadata_support(session); |
93ec662e JD |
3484 | if (ret) { |
3485 | goto end; | |
3486 | } | |
3487 | ||
3488 | if (session->kernel_session) { | |
eded6438 | 3489 | ret = kernctl_session_regenerate_metadata( |
93ec662e JD |
3490 | session->kernel_session->fd); |
3491 | if (ret < 0) { | |
3492 | ERR("Failed to regenerate the kernel metadata"); | |
3493 | goto end; | |
3494 | } | |
3495 | } | |
3496 | ||
3497 | if (session->ust_session) { | |
eded6438 | 3498 | ret = ust_regenerate_metadata(session->ust_session); |
93ec662e JD |
3499 | if (ret < 0) { |
3500 | ERR("Failed to regenerate the UST metadata"); | |
3501 | goto end; | |
3502 | } | |
3503 | } | |
3504 | DBG("Cmd metadata regenerate for session %s", session->name); | |
3505 | ret = LTTNG_OK; | |
3506 | ||
3507 | end: | |
3508 | return ret; | |
3509 | } | |
3510 | ||
c2561365 JD |
3511 | /* |
3512 | * Command LTTNG_REGENERATE_STATEDUMP from the lttng-ctl library. | |
3513 | * | |
3514 | * Ask the tracer to regenerate a new statedump. | |
3515 | * | |
3516 | * Return 0 on success or else a LTTNG_ERR code. | |
3517 | */ | |
3518 | int cmd_regenerate_statedump(struct ltt_session *session) | |
3519 | { | |
3520 | int ret; | |
3521 | ||
3522 | assert(session); | |
3523 | ||
3524 | if (!session->active) { | |
3525 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
3526 | goto end; | |
3527 | } | |
3528 | ret = 0; | |
3529 | ||
3530 | if (session->kernel_session) { | |
3531 | ret = kernctl_session_regenerate_statedump( | |
3532 | session->kernel_session->fd); | |
3533 | /* | |
3534 | * Currently, the statedump in kernel can only fail if out | |
3535 | * of memory. | |
3536 | */ | |
3537 | if (ret < 0) { | |
3538 | if (ret == -ENOMEM) { | |
3539 | ret = LTTNG_ERR_REGEN_STATEDUMP_NOMEM; | |
3540 | } else { | |
3541 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
3542 | } | |
3543 | ERR("Failed to regenerate the kernel statedump"); | |
3544 | goto end; | |
3545 | } | |
3546 | } | |
3547 | ||
3548 | if (session->ust_session) { | |
3549 | ret = ust_app_regenerate_statedump_all(session->ust_session); | |
3550 | /* | |
3551 | * Currently, the statedump in UST always returns 0. | |
3552 | */ | |
3553 | if (ret < 0) { | |
3554 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
3555 | ERR("Failed to regenerate the UST statedump"); | |
3556 | goto end; | |
3557 | } | |
3558 | } | |
3559 | DBG("Cmd regenerate statedump for session %s", session->name); | |
3560 | ret = LTTNG_OK; | |
3561 | ||
3562 | end: | |
3563 | return ret; | |
3564 | } | |
3565 | ||
b0880ae5 JG |
3566 | int cmd_register_trigger(struct command_ctx *cmd_ctx, int sock, |
3567 | struct notification_thread_handle *notification_thread) | |
3568 | { | |
3569 | int ret; | |
3570 | size_t trigger_len; | |
3571 | ssize_t sock_recv_len; | |
3572 | struct lttng_trigger *trigger = NULL; | |
3573 | struct lttng_buffer_view view; | |
3574 | struct lttng_dynamic_buffer trigger_buffer; | |
3575 | ||
3576 | lttng_dynamic_buffer_init(&trigger_buffer); | |
3577 | trigger_len = (size_t) cmd_ctx->lsm->u.trigger.length; | |
3578 | ret = lttng_dynamic_buffer_set_size(&trigger_buffer, trigger_len); | |
3579 | if (ret) { | |
3580 | ret = LTTNG_ERR_NOMEM; | |
3581 | goto end; | |
3582 | } | |
3583 | ||
3584 | sock_recv_len = lttcomm_recv_unix_sock(sock, trigger_buffer.data, | |
3585 | trigger_len); | |
3586 | if (sock_recv_len < 0 || sock_recv_len != trigger_len) { | |
3587 | ERR("Failed to receive \"register trigger\" command payload"); | |
3588 | /* TODO: should this be a new error enum ? */ | |
3589 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
3590 | goto end; | |
3591 | } | |
3592 | ||
3593 | view = lttng_buffer_view_from_dynamic_buffer(&trigger_buffer, 0, -1); | |
3594 | if (lttng_trigger_create_from_buffer(&view, &trigger) != | |
3595 | trigger_len) { | |
3596 | ERR("Invalid trigger payload received in \"register trigger\" command"); | |
3597 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
3598 | goto end; | |
3599 | } | |
3600 | ||
3601 | ret = notification_thread_command_register_trigger(notification_thread, | |
3602 | trigger); | |
587f9fd0 JG |
3603 | /* Ownership of trigger was transferred. */ |
3604 | trigger = NULL; | |
b0880ae5 | 3605 | end: |
587f9fd0 | 3606 | lttng_trigger_destroy(trigger); |
b0880ae5 JG |
3607 | lttng_dynamic_buffer_reset(&trigger_buffer); |
3608 | return ret; | |
3609 | } | |
3610 | ||
3611 | int cmd_unregister_trigger(struct command_ctx *cmd_ctx, int sock, | |
3612 | struct notification_thread_handle *notification_thread) | |
3613 | { | |
3614 | int ret; | |
3615 | size_t trigger_len; | |
3616 | ssize_t sock_recv_len; | |
3617 | struct lttng_trigger *trigger = NULL; | |
3618 | struct lttng_buffer_view view; | |
3619 | struct lttng_dynamic_buffer trigger_buffer; | |
3620 | ||
3621 | lttng_dynamic_buffer_init(&trigger_buffer); | |
3622 | trigger_len = (size_t) cmd_ctx->lsm->u.trigger.length; | |
3623 | ret = lttng_dynamic_buffer_set_size(&trigger_buffer, trigger_len); | |
3624 | if (ret) { | |
3625 | ret = LTTNG_ERR_NOMEM; | |
3626 | goto end; | |
3627 | } | |
3628 | ||
3629 | sock_recv_len = lttcomm_recv_unix_sock(sock, trigger_buffer.data, | |
3630 | trigger_len); | |
3631 | if (sock_recv_len < 0 || sock_recv_len != trigger_len) { | |
3632 | ERR("Failed to receive \"unregister trigger\" command payload"); | |
3633 | /* TODO: should this be a new error enum ? */ | |
3634 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
3635 | goto end; | |
3636 | } | |
3637 | ||
3638 | view = lttng_buffer_view_from_dynamic_buffer(&trigger_buffer, 0, -1); | |
3639 | if (lttng_trigger_create_from_buffer(&view, &trigger) != | |
3640 | trigger_len) { | |
3641 | ERR("Invalid trigger payload received in \"unregister trigger\" command"); | |
3642 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
3643 | goto end; | |
3644 | } | |
3645 | ||
3646 | ret = notification_thread_command_unregister_trigger(notification_thread, | |
3647 | trigger); | |
3648 | end: | |
587f9fd0 | 3649 | lttng_trigger_destroy(trigger); |
b0880ae5 JG |
3650 | lttng_dynamic_buffer_reset(&trigger_buffer); |
3651 | return ret; | |
3652 | } | |
3653 | ||
6dc3064a DG |
3654 | /* |
3655 | * Send relayd sockets from snapshot output to consumer. Ignore request if the | |
3656 | * snapshot output is *not* set with a remote destination. | |
3657 | * | |
a934f4af | 3658 | * Return 0 on success or a LTTNG_ERR code. |
6dc3064a DG |
3659 | */ |
3660 | static int set_relayd_for_snapshot(struct consumer_output *consumer, | |
3661 | struct snapshot_output *snap_output, struct ltt_session *session) | |
3662 | { | |
a934f4af | 3663 | int ret = LTTNG_OK; |
6dc3064a DG |
3664 | struct lttng_ht_iter iter; |
3665 | struct consumer_socket *socket; | |
3666 | ||
3667 | assert(consumer); | |
3668 | assert(snap_output); | |
3669 | assert(session); | |
3670 | ||
3671 | DBG2("Set relayd object from snapshot output"); | |
3672 | ||
3673 | /* Ignore if snapshot consumer output is not network. */ | |
3674 | if (snap_output->consumer->type != CONSUMER_DST_NET) { | |
3675 | goto error; | |
3676 | } | |
3677 | ||
3678 | /* | |
3679 | * For each consumer socket, create and send the relayd object of the | |
3680 | * snapshot output. | |
3681 | */ | |
3682 | rcu_read_lock(); | |
5eecee74 DG |
3683 | cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter, |
3684 | socket, node.node) { | |
6dc3064a | 3685 | ret = send_consumer_relayd_sockets(0, session->id, |
d3e2ba59 JD |
3686 | snap_output->consumer, socket, |
3687 | session->name, session->hostname, | |
3688 | session->live_timer); | |
a934f4af | 3689 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3690 | rcu_read_unlock(); |
3691 | goto error; | |
3692 | } | |
3693 | } | |
3694 | rcu_read_unlock(); | |
3695 | ||
3696 | error: | |
3697 | return ret; | |
3698 | } | |
3699 | ||
3700 | /* | |
3701 | * Record a kernel snapshot. | |
3702 | * | |
fac41e72 | 3703 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a DG |
3704 | */ |
3705 | static int record_kernel_snapshot(struct ltt_kernel_session *ksess, | |
5c786ded | 3706 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3707 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3708 | { |
3709 | int ret; | |
3710 | ||
3711 | assert(ksess); | |
3712 | assert(output); | |
3713 | assert(session); | |
3714 | ||
10a50311 | 3715 | |
af706bb7 DG |
3716 | /* |
3717 | * Copy kernel session sockets so we can communicate with the right | |
3718 | * consumer for the snapshot record command. | |
3719 | */ | |
3720 | ret = consumer_copy_sockets(output->consumer, ksess->consumer); | |
3721 | if (ret < 0) { | |
a934f4af | 3722 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3723 | goto error; |
6dc3064a DG |
3724 | } |
3725 | ||
3726 | ret = set_relayd_for_snapshot(ksess->consumer, output, session); | |
a934f4af | 3727 | if (ret != LTTNG_OK) { |
af706bb7 | 3728 | goto error_snapshot; |
6dc3064a DG |
3729 | } |
3730 | ||
d07ceecd | 3731 | ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream); |
2a06df8d | 3732 | if (ret != LTTNG_OK) { |
af706bb7 | 3733 | goto error_snapshot; |
6dc3064a DG |
3734 | } |
3735 | ||
a934f4af | 3736 | ret = LTTNG_OK; |
1371fc12 | 3737 | goto end; |
a934f4af | 3738 | |
af706bb7 DG |
3739 | error_snapshot: |
3740 | /* Clean up copied sockets so this output can use some other later on. */ | |
3741 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a | 3742 | error: |
1371fc12 | 3743 | end: |
6dc3064a DG |
3744 | return ret; |
3745 | } | |
3746 | ||
3747 | /* | |
3748 | * Record a UST snapshot. | |
3749 | * | |
a934f4af | 3750 | * Return 0 on success or a LTTNG_ERR error code. |
6dc3064a DG |
3751 | */ |
3752 | static int record_ust_snapshot(struct ltt_ust_session *usess, | |
5c786ded | 3753 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3754 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3755 | { |
3756 | int ret; | |
3757 | ||
3758 | assert(usess); | |
3759 | assert(output); | |
3760 | assert(session); | |
3761 | ||
af706bb7 | 3762 | /* |
d3f14b8a | 3763 | * Copy UST session sockets so we can communicate with the right |
af706bb7 DG |
3764 | * consumer for the snapshot record command. |
3765 | */ | |
3766 | ret = consumer_copy_sockets(output->consumer, usess->consumer); | |
3767 | if (ret < 0) { | |
a934f4af | 3768 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3769 | goto error; |
6dc3064a DG |
3770 | } |
3771 | ||
3772 | ret = set_relayd_for_snapshot(usess->consumer, output, session); | |
a934f4af | 3773 | if (ret != LTTNG_OK) { |
af706bb7 | 3774 | goto error_snapshot; |
6dc3064a DG |
3775 | } |
3776 | ||
d07ceecd | 3777 | ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream); |
6dc3064a | 3778 | if (ret < 0) { |
7badf927 DG |
3779 | switch (-ret) { |
3780 | case EINVAL: | |
a934f4af | 3781 | ret = LTTNG_ERR_INVALID; |
7badf927 | 3782 | break; |
7badf927 DG |
3783 | default: |
3784 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
3785 | break; | |
5c786ded | 3786 | } |
af706bb7 | 3787 | goto error_snapshot; |
6dc3064a DG |
3788 | } |
3789 | ||
a934f4af DG |
3790 | ret = LTTNG_OK; |
3791 | ||
af706bb7 DG |
3792 | error_snapshot: |
3793 | /* Clean up copied sockets so this output can use some other later on. */ | |
3794 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a DG |
3795 | error: |
3796 | return ret; | |
3797 | } | |
3798 | ||
d07ceecd MD |
3799 | static |
3800 | uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session, | |
3801 | uint64_t cur_nr_packets) | |
68808f4e | 3802 | { |
d07ceecd | 3803 | uint64_t tot_size = 0; |
68808f4e DG |
3804 | |
3805 | if (session->kernel_session) { | |
3806 | struct ltt_kernel_channel *chan; | |
3807 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3808 | ||
68808f4e | 3809 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
d07ceecd MD |
3810 | if (cur_nr_packets >= chan->channel->attr.num_subbuf) { |
3811 | /* | |
3812 | * Don't take channel into account if we | |
3813 | * already grab all its packets. | |
3814 | */ | |
3815 | continue; | |
68808f4e | 3816 | } |
d07ceecd MD |
3817 | tot_size += chan->channel->attr.subbuf_size |
3818 | * chan->stream_count; | |
68808f4e DG |
3819 | } |
3820 | } | |
3821 | ||
3822 | if (session->ust_session) { | |
68808f4e DG |
3823 | struct ltt_ust_session *usess = session->ust_session; |
3824 | ||
d07ceecd MD |
3825 | tot_size += ust_app_get_size_one_more_packet_per_stream(usess, |
3826 | cur_nr_packets); | |
68808f4e DG |
3827 | } |
3828 | ||
d07ceecd | 3829 | return tot_size; |
68808f4e DG |
3830 | } |
3831 | ||
5c786ded | 3832 | /* |
d07ceecd MD |
3833 | * Calculate the number of packets we can grab from each stream that |
3834 | * fits within the overall snapshot max size. | |
3835 | * | |
3836 | * Returns -1 on error, 0 means infinite number of packets, else > 0 is | |
3837 | * the number of packets per stream. | |
3838 | * | |
3839 | * TODO: this approach is not perfect: we consider the worse case | |
3840 | * (packet filling the sub-buffers) as an upper bound, but we could do | |
3841 | * better if we do this calculation while we actually grab the packet | |
3842 | * content: we would know how much padding we don't actually store into | |
3843 | * the file. | |
3844 | * | |
3845 | * This algorithm is currently bounded by the number of packets per | |
3846 | * stream. | |
3847 | * | |
3848 | * Since we call this algorithm before actually grabbing the data, it's | |
3849 | * an approximation: for instance, applications could appear/disappear | |
3850 | * in between this call and actually grabbing data. | |
5c786ded | 3851 | */ |
d07ceecd MD |
3852 | static |
3853 | int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size) | |
5c786ded | 3854 | { |
d07ceecd MD |
3855 | int64_t size_left; |
3856 | uint64_t cur_nb_packets = 0; | |
5c786ded | 3857 | |
d07ceecd MD |
3858 | if (!max_size) { |
3859 | return 0; /* Infinite */ | |
5c786ded JD |
3860 | } |
3861 | ||
d07ceecd MD |
3862 | size_left = max_size; |
3863 | for (;;) { | |
3864 | uint64_t one_more_packet_tot_size; | |
5c786ded | 3865 | |
d07ceecd MD |
3866 | one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session, |
3867 | cur_nb_packets); | |
3868 | if (!one_more_packet_tot_size) { | |
3869 | /* We are already grabbing all packets. */ | |
3870 | break; | |
3871 | } | |
3872 | size_left -= one_more_packet_tot_size; | |
3873 | if (size_left < 0) { | |
3874 | break; | |
3875 | } | |
3876 | cur_nb_packets++; | |
5c786ded | 3877 | } |
d07ceecd MD |
3878 | if (!cur_nb_packets) { |
3879 | /* Not enough room to grab one packet of each stream, error. */ | |
3880 | return -1; | |
3881 | } | |
3882 | return cur_nb_packets; | |
5c786ded JD |
3883 | } |
3884 | ||
6dc3064a DG |
3885 | /* |
3886 | * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl. | |
3887 | * | |
3888 | * The wait parameter is ignored so this call always wait for the snapshot to | |
3889 | * complete before returning. | |
3890 | * | |
3891 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3892 | */ | |
3893 | int cmd_snapshot_record(struct ltt_session *session, | |
3894 | struct lttng_snapshot_output *output, int wait) | |
3895 | { | |
3896 | int ret = LTTNG_OK; | |
e1986656 DG |
3897 | unsigned int use_tmp_output = 0; |
3898 | struct snapshot_output tmp_output; | |
00e1dfc4 | 3899 | unsigned int snapshot_success = 0; |
10ba83fe | 3900 | char datetime[16]; |
6dc3064a DG |
3901 | |
3902 | assert(session); | |
ba45d9f0 | 3903 | assert(output); |
6dc3064a DG |
3904 | |
3905 | DBG("Cmd snapshot record for session %s", session->name); | |
3906 | ||
10ba83fe JR |
3907 | /* Get the datetime for the snapshot output directory. */ |
3908 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", datetime, | |
3909 | sizeof(datetime)); | |
3910 | if (!ret) { | |
3911 | ret = LTTNG_ERR_INVALID; | |
3912 | goto error; | |
3913 | } | |
3914 | ||
6dc3064a | 3915 | /* |
d3f14b8a MD |
3916 | * Permission denied to create an output if the session is not |
3917 | * set in no output mode. | |
6dc3064a DG |
3918 | */ |
3919 | if (session->output_traces) { | |
903ef685 | 3920 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3921 | goto error; |
3922 | } | |
3923 | ||
3924 | /* The session needs to be started at least once. */ | |
8382cf6f | 3925 | if (!session->has_been_started) { |
6dc3064a DG |
3926 | ret = LTTNG_ERR_START_SESSION_ONCE; |
3927 | goto error; | |
3928 | } | |
3929 | ||
3930 | /* Use temporary output for the session. */ | |
ba45d9f0 | 3931 | if (*output->ctrl_url != '\0') { |
6dc3064a DG |
3932 | ret = snapshot_output_init(output->max_size, output->name, |
3933 | output->ctrl_url, output->data_url, session->consumer, | |
e1986656 | 3934 | &tmp_output, NULL); |
6dc3064a DG |
3935 | if (ret < 0) { |
3936 | if (ret == -ENOMEM) { | |
3937 | ret = LTTNG_ERR_NOMEM; | |
3938 | } else { | |
3939 | ret = LTTNG_ERR_INVALID; | |
3940 | } | |
3941 | goto error; | |
3942 | } | |
1bfe7328 DG |
3943 | /* Use the global session count for the temporary snapshot. */ |
3944 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; | |
10ba83fe JR |
3945 | |
3946 | /* Use the global datetime */ | |
3947 | memcpy(tmp_output.datetime, datetime, sizeof(datetime)); | |
e1986656 | 3948 | use_tmp_output = 1; |
6dc3064a DG |
3949 | } |
3950 | ||
804c90a8 JR |
3951 | if (use_tmp_output) { |
3952 | int64_t nb_packets_per_stream; | |
6dc3064a | 3953 | |
804c90a8 JR |
3954 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, |
3955 | tmp_output.max_size); | |
3956 | if (nb_packets_per_stream < 0) { | |
3957 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
3958 | goto error; | |
3959 | } | |
d07ceecd | 3960 | |
804c90a8 JR |
3961 | if (session->kernel_session) { |
3962 | ret = record_kernel_snapshot(session->kernel_session, | |
3963 | &tmp_output, session, | |
3964 | wait, nb_packets_per_stream); | |
3965 | if (ret != LTTNG_OK) { | |
d07ceecd MD |
3966 | goto error; |
3967 | } | |
804c90a8 JR |
3968 | } |
3969 | ||
3970 | if (session->ust_session) { | |
3971 | ret = record_ust_snapshot(session->ust_session, | |
3972 | &tmp_output, session, | |
d07ceecd | 3973 | wait, nb_packets_per_stream); |
a934f4af | 3974 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3975 | goto error; |
3976 | } | |
804c90a8 | 3977 | } |
e1986656 | 3978 | |
804c90a8 JR |
3979 | snapshot_success = 1; |
3980 | } else { | |
3981 | struct snapshot_output *sout; | |
3982 | struct lttng_ht_iter iter; | |
68808f4e | 3983 | |
804c90a8 JR |
3984 | rcu_read_lock(); |
3985 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
3986 | &iter.iter, sout, node.node) { | |
3987 | int64_t nb_packets_per_stream; | |
e1986656 | 3988 | |
804c90a8 JR |
3989 | /* |
3990 | * Make a local copy of the output and assign the possible | |
3991 | * temporary value given by the caller. | |
3992 | */ | |
3993 | memset(&tmp_output, 0, sizeof(tmp_output)); | |
3994 | memcpy(&tmp_output, sout, sizeof(tmp_output)); | |
1bfe7328 | 3995 | |
804c90a8 JR |
3996 | if (output->max_size != (uint64_t) -1ULL) { |
3997 | tmp_output.max_size = output->max_size; | |
6dc3064a | 3998 | } |
d07ceecd MD |
3999 | |
4000 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
4001 | tmp_output.max_size); | |
4002 | if (nb_packets_per_stream < 0) { | |
4003 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
804c90a8 | 4004 | rcu_read_unlock(); |
d07ceecd MD |
4005 | goto error; |
4006 | } | |
6dc3064a | 4007 | |
804c90a8 JR |
4008 | /* Use temporary name. */ |
4009 | if (*output->name != '\0') { | |
cf3e357d MD |
4010 | if (lttng_strncpy(tmp_output.name, output->name, |
4011 | sizeof(tmp_output.name))) { | |
4012 | ret = LTTNG_ERR_INVALID; | |
4013 | rcu_read_unlock(); | |
4014 | goto error; | |
4015 | } | |
804c90a8 | 4016 | } |
e1986656 | 4017 | |
804c90a8 | 4018 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; |
10ba83fe | 4019 | memcpy(tmp_output.datetime, datetime, sizeof(datetime)); |
e1986656 | 4020 | |
804c90a8 JR |
4021 | if (session->kernel_session) { |
4022 | ret = record_kernel_snapshot(session->kernel_session, | |
4023 | &tmp_output, session, | |
4024 | wait, nb_packets_per_stream); | |
4025 | if (ret != LTTNG_OK) { | |
d07ceecd | 4026 | rcu_read_unlock(); |
68808f4e DG |
4027 | goto error; |
4028 | } | |
804c90a8 | 4029 | } |
68808f4e | 4030 | |
804c90a8 JR |
4031 | if (session->ust_session) { |
4032 | ret = record_ust_snapshot(session->ust_session, | |
4033 | &tmp_output, session, | |
d07ceecd | 4034 | wait, nb_packets_per_stream); |
a934f4af | 4035 | if (ret != LTTNG_OK) { |
6dc3064a DG |
4036 | rcu_read_unlock(); |
4037 | goto error; | |
4038 | } | |
4039 | } | |
804c90a8 | 4040 | snapshot_success = 1; |
6dc3064a | 4041 | } |
804c90a8 | 4042 | rcu_read_unlock(); |
6dc3064a DG |
4043 | } |
4044 | ||
1bfe7328 DG |
4045 | if (snapshot_success) { |
4046 | session->snapshot.nb_snapshot++; | |
b67578cb MD |
4047 | } else { |
4048 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
1bfe7328 DG |
4049 | } |
4050 | ||
6dc3064a | 4051 | error: |
6dc3064a DG |
4052 | return ret; |
4053 | } | |
4054 | ||
d7ba1388 MD |
4055 | /* |
4056 | * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread. | |
4057 | */ | |
4058 | int cmd_set_session_shm_path(struct ltt_session *session, | |
4059 | const char *shm_path) | |
4060 | { | |
4061 | /* Safety net */ | |
4062 | assert(session); | |
4063 | ||
4064 | /* | |
4065 | * Can only set shm path before session is started. | |
4066 | */ | |
4067 | if (session->has_been_started) { | |
4068 | return LTTNG_ERR_SESSION_STARTED; | |
4069 | } | |
4070 | ||
4071 | strncpy(session->shm_path, shm_path, | |
4072 | sizeof(session->shm_path)); | |
4073 | session->shm_path[sizeof(session->shm_path) - 1] = '\0'; | |
4074 | ||
4075 | return 0; | |
4076 | } | |
4077 | ||
2f77fc4b DG |
4078 | /* |
4079 | * Init command subsystem. | |
4080 | */ | |
4081 | void cmd_init(void) | |
4082 | { | |
4083 | /* | |
d88aee68 DG |
4084 | * Set network sequence index to 1 for streams to match a relayd |
4085 | * socket on the consumer side. | |
2f77fc4b | 4086 | */ |
d88aee68 DG |
4087 | pthread_mutex_lock(&relayd_net_seq_idx_lock); |
4088 | relayd_net_seq_idx = 1; | |
4089 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
4090 | |
4091 | DBG("Command subsystem initialized"); | |
4092 | } |