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> | |
883d8478 | 37 | #include <lttng/channel.h> |
b0880ae5 | 38 | #include <lttng/channel-internal.h> |
9f449915 | 39 | #include <common/string-utils/string-utils.h> |
2f77fc4b DG |
40 | |
41 | #include "channel.h" | |
42 | #include "consumer.h" | |
43 | #include "event.h" | |
8782cc74 | 44 | #include "health-sessiond.h" |
2f77fc4b DG |
45 | #include "kernel.h" |
46 | #include "kernel-consumer.h" | |
47 | #include "lttng-sessiond.h" | |
48 | #include "utils.h" | |
834978fd | 49 | #include "syscall.h" |
7c1d2758 | 50 | #include "agent.h" |
93ec662e | 51 | #include "buffer-registry.h" |
b0880ae5 JG |
52 | #include "notification-thread.h" |
53 | #include "notification-thread-commands.h" | |
2f77fc4b DG |
54 | |
55 | #include "cmd.h" | |
56 | ||
57 | /* | |
58 | * Used to keep a unique index for each relayd socket created where this value | |
59 | * is associated with streams on the consumer so it can match the right relayd | |
d88aee68 DG |
60 | * to send to. It must be accessed with the relayd_net_seq_idx_lock |
61 | * held. | |
2f77fc4b | 62 | */ |
d88aee68 DG |
63 | static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER; |
64 | static uint64_t relayd_net_seq_idx; | |
2f77fc4b | 65 | |
7076b56e JG |
66 | static int validate_ust_event_name(const char *); |
67 | static int cmd_enable_event_internal(struct ltt_session *session, | |
68 | struct lttng_domain *domain, | |
69 | char *channel_name, struct lttng_event *event, | |
70 | char *filter_expression, | |
71 | struct lttng_filter_bytecode *filter, | |
72 | struct lttng_event_exclusion *exclusion, | |
73 | int wpipe); | |
74 | ||
2f77fc4b DG |
75 | /* |
76 | * Create a session path used by list_lttng_sessions for the case that the | |
77 | * session consumer is on the network. | |
78 | */ | |
79 | static int build_network_session_path(char *dst, size_t size, | |
80 | struct ltt_session *session) | |
81 | { | |
82 | int ret, kdata_port, udata_port; | |
83 | struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL; | |
84 | char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX]; | |
85 | ||
86 | assert(session); | |
87 | assert(dst); | |
88 | ||
89 | memset(tmp_urls, 0, sizeof(tmp_urls)); | |
90 | memset(tmp_uurl, 0, sizeof(tmp_uurl)); | |
91 | ||
92 | kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT; | |
93 | ||
94 | if (session->kernel_session && session->kernel_session->consumer) { | |
95 | kuri = &session->kernel_session->consumer->dst.net.control; | |
96 | kdata_port = session->kernel_session->consumer->dst.net.data.port; | |
97 | } | |
98 | ||
99 | if (session->ust_session && session->ust_session->consumer) { | |
100 | uuri = &session->ust_session->consumer->dst.net.control; | |
101 | udata_port = session->ust_session->consumer->dst.net.data.port; | |
102 | } | |
103 | ||
104 | if (uuri == NULL && kuri == NULL) { | |
105 | uri = &session->consumer->dst.net.control; | |
106 | kdata_port = session->consumer->dst.net.data.port; | |
107 | } else if (kuri && uuri) { | |
108 | ret = uri_compare(kuri, uuri); | |
109 | if (ret) { | |
110 | /* Not Equal */ | |
111 | uri = kuri; | |
112 | /* Build uuri URL string */ | |
113 | ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl)); | |
114 | if (ret < 0) { | |
115 | goto error; | |
116 | } | |
117 | } else { | |
118 | uri = kuri; | |
119 | } | |
120 | } else if (kuri && uuri == NULL) { | |
121 | uri = kuri; | |
122 | } else if (uuri && kuri == NULL) { | |
123 | uri = uuri; | |
124 | } | |
125 | ||
126 | ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls)); | |
127 | if (ret < 0) { | |
128 | goto error; | |
129 | } | |
130 | ||
9aa9f900 DG |
131 | /* |
132 | * Do we have a UST url set. If yes, this means we have both kernel and UST | |
133 | * to print. | |
134 | */ | |
9d035200 | 135 | if (*tmp_uurl != '\0') { |
2f77fc4b DG |
136 | ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]", |
137 | tmp_urls, kdata_port, tmp_uurl, udata_port); | |
138 | } else { | |
9aa9f900 | 139 | int dport; |
bef08707 | 140 | if (kuri || (!kuri && !uuri)) { |
9aa9f900 DG |
141 | dport = kdata_port; |
142 | } else { | |
143 | /* No kernel URI, use the UST port. */ | |
144 | dport = udata_port; | |
145 | } | |
146 | ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport); | |
2f77fc4b DG |
147 | } |
148 | ||
149 | error: | |
150 | return ret; | |
151 | } | |
152 | ||
fb83fe64 JD |
153 | /* |
154 | * Get run-time attributes if the session has been started (discarded events, | |
155 | * lost packets). | |
156 | */ | |
157 | static int get_kernel_runtime_stats(struct ltt_session *session, | |
158 | struct ltt_kernel_channel *kchan, uint64_t *discarded_events, | |
159 | uint64_t *lost_packets) | |
160 | { | |
161 | int ret; | |
162 | ||
163 | if (!session->has_been_started) { | |
164 | ret = 0; | |
165 | *discarded_events = 0; | |
166 | *lost_packets = 0; | |
167 | goto end; | |
168 | } | |
169 | ||
170 | ret = consumer_get_discarded_events(session->id, kchan->fd, | |
171 | session->kernel_session->consumer, | |
172 | discarded_events); | |
173 | if (ret < 0) { | |
174 | goto end; | |
175 | } | |
176 | ||
177 | ret = consumer_get_lost_packets(session->id, kchan->fd, | |
178 | session->kernel_session->consumer, | |
179 | lost_packets); | |
180 | if (ret < 0) { | |
181 | goto end; | |
182 | } | |
183 | ||
184 | end: | |
185 | return ret; | |
186 | } | |
187 | ||
188 | /* | |
189 | * Get run-time attributes if the session has been started (discarded events, | |
190 | * lost packets). | |
191 | */ | |
192 | static int get_ust_runtime_stats(struct ltt_session *session, | |
193 | struct ltt_ust_channel *uchan, uint64_t *discarded_events, | |
194 | uint64_t *lost_packets) | |
195 | { | |
196 | int ret; | |
197 | struct ltt_ust_session *usess; | |
198 | ||
a91c5803 JG |
199 | if (!discarded_events || !lost_packets) { |
200 | ret = -1; | |
201 | goto end; | |
202 | } | |
203 | ||
fb83fe64 | 204 | usess = session->ust_session; |
a905c624 JG |
205 | assert(discarded_events); |
206 | assert(lost_packets); | |
fb83fe64 JD |
207 | |
208 | if (!usess || !session->has_been_started) { | |
209 | *discarded_events = 0; | |
210 | *lost_packets = 0; | |
211 | ret = 0; | |
212 | goto end; | |
213 | } | |
214 | ||
215 | if (usess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
216 | ret = ust_app_uid_get_channel_runtime_stats(usess->id, | |
217 | &usess->buffer_reg_uid_list, | |
218 | usess->consumer, uchan->id, | |
219 | uchan->attr.overwrite, | |
220 | discarded_events, | |
221 | lost_packets); | |
222 | } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
223 | ret = ust_app_pid_get_channel_runtime_stats(usess, | |
224 | uchan, usess->consumer, | |
225 | uchan->attr.overwrite, | |
226 | discarded_events, | |
227 | lost_packets); | |
228 | if (ret < 0) { | |
229 | goto end; | |
230 | } | |
231 | *discarded_events += uchan->per_pid_closed_app_discarded; | |
232 | *lost_packets += uchan->per_pid_closed_app_lost; | |
233 | } else { | |
234 | ERR("Unsupported buffer type"); | |
967bc289 | 235 | assert(0); |
fb83fe64 JD |
236 | ret = -1; |
237 | goto end; | |
238 | } | |
239 | ||
240 | end: | |
241 | return ret; | |
242 | } | |
243 | ||
2f77fc4b DG |
244 | /* |
245 | * Fill lttng_channel array of all channels. | |
246 | */ | |
b958c3ad | 247 | static ssize_t list_lttng_channels(enum lttng_domain_type domain, |
fb83fe64 | 248 | struct ltt_session *session, struct lttng_channel *channels, |
cf0bcb51 | 249 | struct lttng_channel_extended *chan_exts) |
2f77fc4b | 250 | { |
b958c3ad | 251 | int i = 0, ret = 0; |
2f77fc4b DG |
252 | struct ltt_kernel_channel *kchan; |
253 | ||
254 | DBG("Listing channels for session %s", session->name); | |
255 | ||
256 | switch (domain) { | |
257 | case LTTNG_DOMAIN_KERNEL: | |
258 | /* Kernel channels */ | |
259 | if (session->kernel_session != NULL) { | |
260 | cds_list_for_each_entry(kchan, | |
261 | &session->kernel_session->channel_list.head, list) { | |
fb83fe64 | 262 | uint64_t discarded_events, lost_packets; |
cf0bcb51 JG |
263 | struct lttng_channel_extended *extended; |
264 | ||
265 | extended = (struct lttng_channel_extended *) | |
266 | kchan->channel->attr.extended.ptr; | |
fb83fe64 JD |
267 | |
268 | ret = get_kernel_runtime_stats(session, kchan, | |
269 | &discarded_events, &lost_packets); | |
270 | if (ret < 0) { | |
271 | goto end; | |
272 | } | |
2f77fc4b DG |
273 | /* Copy lttng_channel struct to array */ |
274 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
275 | channels[i].enabled = kchan->enabled; | |
fb83fe64 JD |
276 | chan_exts[i].discarded_events = |
277 | discarded_events; | |
278 | chan_exts[i].lost_packets = lost_packets; | |
cf0bcb51 JG |
279 | chan_exts[i].monitor_timer_interval = |
280 | extended->monitor_timer_interval; | |
f515d318 | 281 | chan_exts[i].blocking_timeout = 0; |
2f77fc4b DG |
282 | i++; |
283 | } | |
284 | } | |
285 | break; | |
286 | case LTTNG_DOMAIN_UST: | |
287 | { | |
288 | struct lttng_ht_iter iter; | |
289 | struct ltt_ust_channel *uchan; | |
290 | ||
e7fe706f | 291 | rcu_read_lock(); |
2f77fc4b DG |
292 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
293 | &iter.iter, uchan, node.node) { | |
a91c5803 | 294 | uint64_t discarded_events = 0, lost_packets = 0; |
fb83fe64 | 295 | |
8ee609c8 MD |
296 | if (lttng_strncpy(channels[i].name, uchan->name, |
297 | LTTNG_SYMBOL_NAME_LEN)) { | |
298 | break; | |
299 | } | |
2f77fc4b DG |
300 | channels[i].attr.overwrite = uchan->attr.overwrite; |
301 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
302 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
303 | channels[i].attr.switch_timer_interval = | |
304 | uchan->attr.switch_timer_interval; | |
305 | channels[i].attr.read_timer_interval = | |
306 | uchan->attr.read_timer_interval; | |
307 | channels[i].enabled = uchan->enabled; | |
2f785fe7 DG |
308 | channels[i].attr.tracefile_size = uchan->tracefile_size; |
309 | channels[i].attr.tracefile_count = uchan->tracefile_count; | |
5e4435a4 JG |
310 | |
311 | /* | |
312 | * Map enum lttng_ust_output to enum lttng_event_output. | |
313 | */ | |
2f77fc4b DG |
314 | switch (uchan->attr.output) { |
315 | case LTTNG_UST_MMAP: | |
2f77fc4b DG |
316 | channels[i].attr.output = LTTNG_EVENT_MMAP; |
317 | break; | |
5e4435a4 JG |
318 | default: |
319 | /* | |
320 | * LTTNG_UST_MMAP is the only supported UST | |
321 | * output mode. | |
322 | */ | |
323 | assert(0); | |
324 | break; | |
2f77fc4b | 325 | } |
fb83fe64 | 326 | |
b958c3ad MD |
327 | chan_exts[i].monitor_timer_interval = |
328 | uchan->monitor_timer_interval; | |
f515d318 MD |
329 | chan_exts[i].blocking_timeout = |
330 | uchan->attr.u.s.blocking_timeout; | |
b958c3ad | 331 | |
fb83fe64 JD |
332 | ret = get_ust_runtime_stats(session, uchan, |
333 | &discarded_events, &lost_packets); | |
334 | if (ret < 0) { | |
335 | break; | |
336 | } | |
337 | chan_exts[i].discarded_events = discarded_events; | |
338 | chan_exts[i].lost_packets = lost_packets; | |
2f77fc4b DG |
339 | i++; |
340 | } | |
e7fe706f | 341 | rcu_read_unlock(); |
2f77fc4b DG |
342 | break; |
343 | } | |
344 | default: | |
345 | break; | |
346 | } | |
fb83fe64 JD |
347 | |
348 | end: | |
b958c3ad MD |
349 | if (ret < 0) { |
350 | return -LTTNG_ERR_FATAL; | |
351 | } else { | |
352 | return LTTNG_OK; | |
353 | } | |
2f77fc4b DG |
354 | } |
355 | ||
b4e3ceb9 | 356 | static void increment_extended_len(const char *filter_expression, |
795d57ce | 357 | struct lttng_event_exclusion *exclusion, size_t *extended_len) |
b4e3ceb9 PP |
358 | { |
359 | *extended_len += sizeof(struct lttcomm_event_extended_header); | |
360 | ||
361 | if (filter_expression) { | |
362 | *extended_len += strlen(filter_expression) + 1; | |
363 | } | |
795d57ce PP |
364 | |
365 | if (exclusion) { | |
366 | *extended_len += exclusion->count * LTTNG_SYMBOL_NAME_LEN; | |
367 | } | |
b4e3ceb9 PP |
368 | } |
369 | ||
370 | static void append_extended_info(const char *filter_expression, | |
795d57ce | 371 | struct lttng_event_exclusion *exclusion, void **extended_at) |
b4e3ceb9 PP |
372 | { |
373 | struct lttcomm_event_extended_header extended_header; | |
374 | size_t filter_len = 0; | |
795d57ce | 375 | size_t nb_exclusions = 0; |
b4e3ceb9 PP |
376 | |
377 | if (filter_expression) { | |
378 | filter_len = strlen(filter_expression) + 1; | |
379 | } | |
380 | ||
795d57ce PP |
381 | if (exclusion) { |
382 | nb_exclusions = exclusion->count; | |
383 | } | |
384 | ||
385 | /* Set header fields */ | |
b4e3ceb9 | 386 | extended_header.filter_len = filter_len; |
795d57ce PP |
387 | extended_header.nb_exclusions = nb_exclusions; |
388 | ||
389 | /* Copy header */ | |
b4e3ceb9 PP |
390 | memcpy(*extended_at, &extended_header, sizeof(extended_header)); |
391 | *extended_at += sizeof(extended_header); | |
795d57ce PP |
392 | |
393 | /* Copy filter string */ | |
394 | if (filter_expression) { | |
395 | memcpy(*extended_at, filter_expression, filter_len); | |
396 | *extended_at += filter_len; | |
397 | } | |
398 | ||
399 | /* Copy exclusion names */ | |
400 | if (exclusion) { | |
401 | size_t len = nb_exclusions * LTTNG_SYMBOL_NAME_LEN; | |
402 | ||
403 | memcpy(*extended_at, &exclusion->names, len); | |
404 | *extended_at += len; | |
405 | } | |
b4e3ceb9 PP |
406 | } |
407 | ||
3c6a091f | 408 | /* |
022d91ba | 409 | * Create a list of agent domain events. |
3c6a091f DG |
410 | * |
411 | * Return number of events in list on success or else a negative value. | |
412 | */ | |
022d91ba | 413 | static int list_lttng_agent_events(struct agent *agt, |
b4e3ceb9 | 414 | struct lttng_event **events, size_t *total_size) |
3c6a091f DG |
415 | { |
416 | int i = 0, ret = 0; | |
417 | unsigned int nb_event = 0; | |
022d91ba | 418 | struct agent_event *event; |
3c6a091f DG |
419 | struct lttng_event *tmp_events; |
420 | struct lttng_ht_iter iter; | |
b4e3ceb9 PP |
421 | size_t extended_len = 0; |
422 | void *extended_at; | |
3c6a091f | 423 | |
022d91ba | 424 | assert(agt); |
3c6a091f DG |
425 | assert(events); |
426 | ||
022d91ba | 427 | DBG3("Listing agent events"); |
3c6a091f | 428 | |
e5bbf678 | 429 | rcu_read_lock(); |
022d91ba | 430 | nb_event = lttng_ht_get_count(agt->events); |
e5bbf678 | 431 | rcu_read_unlock(); |
3c6a091f DG |
432 | if (nb_event == 0) { |
433 | ret = nb_event; | |
b4e3ceb9 | 434 | *total_size = 0; |
3c6a091f DG |
435 | goto error; |
436 | } | |
437 | ||
b4e3ceb9 PP |
438 | /* Compute required extended infos size */ |
439 | extended_len = nb_event * sizeof(struct lttcomm_event_extended_header); | |
440 | ||
441 | /* | |
442 | * This is only valid because the commands which add events are | |
443 | * processed in the same thread as the listing. | |
444 | */ | |
445 | rcu_read_lock(); | |
446 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { | |
795d57ce PP |
447 | increment_extended_len(event->filter_expression, NULL, |
448 | &extended_len); | |
b4e3ceb9 PP |
449 | } |
450 | rcu_read_unlock(); | |
451 | ||
452 | *total_size = nb_event * sizeof(*tmp_events) + extended_len; | |
453 | tmp_events = zmalloc(*total_size); | |
3c6a091f | 454 | if (!tmp_events) { |
022d91ba | 455 | PERROR("zmalloc agent events session"); |
3c6a091f DG |
456 | ret = -LTTNG_ERR_FATAL; |
457 | goto error; | |
458 | } | |
459 | ||
b4e3ceb9 PP |
460 | extended_at = ((uint8_t *) tmp_events) + |
461 | nb_event * sizeof(struct lttng_event); | |
462 | ||
3c6a091f | 463 | rcu_read_lock(); |
022d91ba | 464 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
3c6a091f DG |
465 | strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name)); |
466 | tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0'; | |
467 | tmp_events[i].enabled = event->enabled; | |
2106efa0 | 468 | tmp_events[i].loglevel = event->loglevel_value; |
ff94328f | 469 | tmp_events[i].loglevel_type = event->loglevel_type; |
3c6a091f | 470 | i++; |
b4e3ceb9 PP |
471 | |
472 | /* Append extended info */ | |
795d57ce PP |
473 | append_extended_info(event->filter_expression, NULL, |
474 | &extended_at); | |
3c6a091f DG |
475 | } |
476 | rcu_read_unlock(); | |
477 | ||
478 | *events = tmp_events; | |
479 | ret = nb_event; | |
480 | ||
481 | error: | |
482 | assert(nb_event == i); | |
483 | return ret; | |
484 | } | |
485 | ||
2f77fc4b DG |
486 | /* |
487 | * Create a list of ust global domain events. | |
488 | */ | |
489 | static int list_lttng_ust_global_events(char *channel_name, | |
b4e3ceb9 PP |
490 | struct ltt_ust_domain_global *ust_global, |
491 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
492 | { |
493 | int i = 0, ret = 0; | |
494 | unsigned int nb_event = 0; | |
495 | struct lttng_ht_iter iter; | |
496 | struct lttng_ht_node_str *node; | |
497 | struct ltt_ust_channel *uchan; | |
498 | struct ltt_ust_event *uevent; | |
499 | struct lttng_event *tmp; | |
b4e3ceb9 PP |
500 | size_t extended_len = 0; |
501 | void *extended_at; | |
2f77fc4b DG |
502 | |
503 | DBG("Listing UST global events for channel %s", channel_name); | |
504 | ||
505 | rcu_read_lock(); | |
506 | ||
507 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); | |
508 | node = lttng_ht_iter_get_node_str(&iter); | |
509 | if (node == NULL) { | |
f73fabfd | 510 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
d31d3e8c | 511 | goto end; |
2f77fc4b DG |
512 | } |
513 | ||
514 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); | |
515 | ||
3c442be3 | 516 | nb_event = lttng_ht_get_count(uchan->events); |
2f77fc4b DG |
517 | if (nb_event == 0) { |
518 | ret = nb_event; | |
b4e3ceb9 | 519 | *total_size = 0; |
d31d3e8c | 520 | goto end; |
2f77fc4b DG |
521 | } |
522 | ||
523 | DBG3("Listing UST global %d events", nb_event); | |
524 | ||
b4e3ceb9 PP |
525 | /* Compute required extended infos size */ |
526 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { | |
527 | if (uevent->internal) { | |
528 | nb_event--; | |
529 | continue; | |
530 | } | |
531 | ||
532 | increment_extended_len(uevent->filter_expression, | |
795d57ce | 533 | uevent->exclusion, &extended_len); |
b4e3ceb9 | 534 | } |
d31d3e8c PP |
535 | if (nb_event == 0) { |
536 | /* All events are internal, skip. */ | |
537 | ret = 0; | |
538 | *total_size = 0; | |
539 | goto end; | |
540 | } | |
b4e3ceb9 PP |
541 | |
542 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
543 | tmp = zmalloc(*total_size); | |
2f77fc4b | 544 | if (tmp == NULL) { |
b12c38df JG |
545 | ret = -LTTNG_ERR_FATAL; |
546 | goto end; | |
2f77fc4b DG |
547 | } |
548 | ||
b4e3ceb9 PP |
549 | extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event); |
550 | ||
2f77fc4b | 551 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
3c442be3 JG |
552 | if (uevent->internal) { |
553 | /* This event should remain hidden from clients */ | |
3c442be3 JG |
554 | continue; |
555 | } | |
2f77fc4b DG |
556 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
557 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
558 | tmp[i].enabled = uevent->enabled; | |
559 | ||
560 | switch (uevent->attr.instrumentation) { | |
561 | case LTTNG_UST_TRACEPOINT: | |
562 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
563 | break; | |
564 | case LTTNG_UST_PROBE: | |
565 | tmp[i].type = LTTNG_EVENT_PROBE; | |
566 | break; | |
567 | case LTTNG_UST_FUNCTION: | |
568 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
569 | break; | |
570 | } | |
571 | ||
572 | tmp[i].loglevel = uevent->attr.loglevel; | |
573 | switch (uevent->attr.loglevel_type) { | |
574 | case LTTNG_UST_LOGLEVEL_ALL: | |
575 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
576 | break; | |
577 | case LTTNG_UST_LOGLEVEL_RANGE: | |
578 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; | |
579 | break; | |
580 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
581 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; | |
582 | break; | |
583 | } | |
584 | if (uevent->filter) { | |
585 | tmp[i].filter = 1; | |
586 | } | |
4634f12e JI |
587 | if (uevent->exclusion) { |
588 | tmp[i].exclusion = 1; | |
589 | } | |
2f77fc4b | 590 | i++; |
b4e3ceb9 PP |
591 | |
592 | /* Append extended info */ | |
795d57ce PP |
593 | append_extended_info(uevent->filter_expression, |
594 | uevent->exclusion, &extended_at); | |
2f77fc4b DG |
595 | } |
596 | ||
597 | ret = nb_event; | |
598 | *events = tmp; | |
d31d3e8c | 599 | end: |
2f77fc4b DG |
600 | rcu_read_unlock(); |
601 | return ret; | |
602 | } | |
603 | ||
604 | /* | |
605 | * Fill lttng_event array of all kernel events in the channel. | |
606 | */ | |
607 | static int list_lttng_kernel_events(char *channel_name, | |
b4e3ceb9 PP |
608 | struct ltt_kernel_session *kernel_session, |
609 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
610 | { |
611 | int i = 0, ret; | |
612 | unsigned int nb_event; | |
613 | struct ltt_kernel_event *event; | |
614 | struct ltt_kernel_channel *kchan; | |
b4e3ceb9 PP |
615 | size_t extended_len = 0; |
616 | void *extended_at; | |
2f77fc4b DG |
617 | |
618 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
619 | if (kchan == NULL) { | |
f73fabfd | 620 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
621 | goto error; |
622 | } | |
623 | ||
624 | nb_event = kchan->event_count; | |
625 | ||
626 | DBG("Listing events for channel %s", kchan->channel->name); | |
627 | ||
628 | if (nb_event == 0) { | |
b4e3ceb9 | 629 | *total_size = 0; |
834978fd | 630 | *events = NULL; |
db906c12 | 631 | goto end; |
2f77fc4b DG |
632 | } |
633 | ||
b4e3ceb9 PP |
634 | /* Compute required extended infos size */ |
635 | cds_list_for_each_entry(event, &kchan->events_list.head, list) { | |
795d57ce PP |
636 | increment_extended_len(event->filter_expression, NULL, |
637 | &extended_len); | |
b4e3ceb9 PP |
638 | } |
639 | ||
640 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
641 | *events = zmalloc(*total_size); | |
2f77fc4b | 642 | if (*events == NULL) { |
f73fabfd | 643 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
644 | goto error; |
645 | } | |
646 | ||
ab4aa612 | 647 | extended_at = ((void *) *events) + |
b4e3ceb9 PP |
648 | nb_event * sizeof(struct lttng_event); |
649 | ||
2f77fc4b DG |
650 | /* Kernel channels */ |
651 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
652 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
653 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
654 | (*events)[i].enabled = event->enabled; | |
00f992f2 JG |
655 | (*events)[i].filter = |
656 | (unsigned char) !!event->filter_expression; | |
2f77fc4b DG |
657 | |
658 | switch (event->event->instrumentation) { | |
659 | case LTTNG_KERNEL_TRACEPOINT: | |
660 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; | |
661 | break; | |
2f77fc4b | 662 | case LTTNG_KERNEL_KRETPROBE: |
1896972b DG |
663 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
664 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
665 | sizeof(struct lttng_kernel_kprobe)); | |
666 | break; | |
667 | case LTTNG_KERNEL_KPROBE: | |
2f77fc4b DG |
668 | (*events)[i].type = LTTNG_EVENT_PROBE; |
669 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
670 | sizeof(struct lttng_kernel_kprobe)); | |
671 | break; | |
672 | case LTTNG_KERNEL_FUNCTION: | |
673 | (*events)[i].type = LTTNG_EVENT_FUNCTION; | |
674 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
675 | sizeof(struct lttng_kernel_function)); | |
676 | break; | |
677 | case LTTNG_KERNEL_NOOP: | |
678 | (*events)[i].type = LTTNG_EVENT_NOOP; | |
679 | break; | |
680 | case LTTNG_KERNEL_SYSCALL: | |
681 | (*events)[i].type = LTTNG_EVENT_SYSCALL; | |
682 | break; | |
683 | case LTTNG_KERNEL_ALL: | |
684 | assert(0); | |
685 | break; | |
686 | } | |
687 | i++; | |
b4e3ceb9 PP |
688 | |
689 | /* Append extended info */ | |
795d57ce PP |
690 | append_extended_info(event->filter_expression, NULL, |
691 | &extended_at); | |
2f77fc4b DG |
692 | } |
693 | ||
db906c12 | 694 | end: |
2f77fc4b DG |
695 | return nb_event; |
696 | ||
697 | error: | |
f73fabfd DG |
698 | /* Negate the error code to differentiate the size from an error */ |
699 | return -ret; | |
2f77fc4b DG |
700 | } |
701 | ||
702 | /* | |
703 | * Add URI so the consumer output object. Set the correct path depending on the | |
704 | * domain adding the default trace directory. | |
705 | */ | |
706 | static int add_uri_to_consumer(struct consumer_output *consumer, | |
56a37563 JG |
707 | struct lttng_uri *uri, enum lttng_domain_type domain, |
708 | const char *session_name) | |
2f77fc4b | 709 | { |
f73fabfd | 710 | int ret = LTTNG_OK; |
2f77fc4b DG |
711 | const char *default_trace_dir; |
712 | ||
713 | assert(uri); | |
714 | ||
715 | if (consumer == NULL) { | |
716 | DBG("No consumer detected. Don't add URI. Stopping."); | |
f73fabfd | 717 | ret = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
718 | goto error; |
719 | } | |
720 | ||
721 | switch (domain) { | |
722 | case LTTNG_DOMAIN_KERNEL: | |
723 | default_trace_dir = DEFAULT_KERNEL_TRACE_DIR; | |
724 | break; | |
725 | case LTTNG_DOMAIN_UST: | |
726 | default_trace_dir = DEFAULT_UST_TRACE_DIR; | |
727 | break; | |
728 | default: | |
729 | /* | |
730 | * This case is possible is we try to add the URI to the global tracing | |
731 | * session consumer object which in this case there is no subdir. | |
732 | */ | |
733 | default_trace_dir = ""; | |
734 | } | |
735 | ||
736 | switch (uri->dtype) { | |
737 | case LTTNG_DST_IPV4: | |
738 | case LTTNG_DST_IPV6: | |
739 | DBG2("Setting network URI to consumer"); | |
740 | ||
df75acac DG |
741 | if (consumer->type == CONSUMER_DST_NET) { |
742 | if ((uri->stype == LTTNG_STREAM_CONTROL && | |
785d2d0d DG |
743 | consumer->dst.net.control_isset) || |
744 | (uri->stype == LTTNG_STREAM_DATA && | |
745 | consumer->dst.net.data_isset)) { | |
df75acac DG |
746 | ret = LTTNG_ERR_URL_EXIST; |
747 | goto error; | |
748 | } | |
749 | } else { | |
750 | memset(&consumer->dst.net, 0, sizeof(consumer->dst.net)); | |
785d2d0d DG |
751 | } |
752 | ||
df75acac DG |
753 | consumer->type = CONSUMER_DST_NET; |
754 | ||
2f77fc4b DG |
755 | /* Set URI into consumer output object */ |
756 | ret = consumer_set_network_uri(consumer, uri); | |
757 | if (ret < 0) { | |
a74934ba | 758 | ret = -ret; |
2f77fc4b DG |
759 | goto error; |
760 | } else if (ret == 1) { | |
761 | /* | |
762 | * URI was the same in the consumer so we do not append the subdir | |
763 | * again so to not duplicate output dir. | |
764 | */ | |
f86c9f4e | 765 | ret = LTTNG_OK; |
2f77fc4b DG |
766 | goto error; |
767 | } | |
768 | ||
769 | if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) { | |
770 | ret = consumer_set_subdir(consumer, session_name); | |
771 | if (ret < 0) { | |
f73fabfd | 772 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
773 | goto error; |
774 | } | |
775 | } | |
776 | ||
777 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
778 | /* On a new subdir, reappend the default trace dir. */ | |
c30ce0b3 CB |
779 | strncat(consumer->subdir, default_trace_dir, |
780 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
781 | DBG3("Append domain trace name to subdir %s", consumer->subdir); |
782 | } | |
783 | ||
784 | break; | |
785 | case LTTNG_DST_PATH: | |
786 | DBG2("Setting trace directory path from URI to %s", uri->dst.path); | |
787 | memset(consumer->dst.trace_path, 0, | |
788 | sizeof(consumer->dst.trace_path)); | |
9ac05d92 MD |
789 | /* Explicit length checks for strcpy and strcat. */ |
790 | if (strlen(uri->dst.path) + strlen(default_trace_dir) | |
791 | >= sizeof(consumer->dst.trace_path)) { | |
792 | ret = LTTNG_ERR_FATAL; | |
793 | goto error; | |
794 | } | |
795 | strcpy(consumer->dst.trace_path, uri->dst.path); | |
2f77fc4b | 796 | /* Append default trace dir */ |
9ac05d92 | 797 | strcat(consumer->dst.trace_path, default_trace_dir); |
2f77fc4b DG |
798 | /* Flag consumer as local. */ |
799 | consumer->type = CONSUMER_DST_LOCAL; | |
800 | break; | |
801 | } | |
802 | ||
a74934ba DG |
803 | ret = LTTNG_OK; |
804 | ||
2f77fc4b DG |
805 | error: |
806 | return ret; | |
807 | } | |
808 | ||
809 | /* | |
810 | * Init tracing by creating trace directory and sending fds kernel consumer. | |
811 | */ | |
812 | static int init_kernel_tracing(struct ltt_kernel_session *session) | |
813 | { | |
814 | int ret = 0; | |
815 | struct lttng_ht_iter iter; | |
816 | struct consumer_socket *socket; | |
817 | ||
818 | assert(session); | |
819 | ||
e7fe706f DG |
820 | rcu_read_lock(); |
821 | ||
2f77fc4b DG |
822 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { |
823 | cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter, | |
824 | socket, node.node) { | |
2f77fc4b | 825 | pthread_mutex_lock(socket->lock); |
f50f23d9 | 826 | ret = kernel_consumer_send_session(socket, session); |
2f77fc4b DG |
827 | pthread_mutex_unlock(socket->lock); |
828 | if (ret < 0) { | |
f73fabfd | 829 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
830 | goto error; |
831 | } | |
832 | } | |
833 | } | |
834 | ||
835 | error: | |
e7fe706f | 836 | rcu_read_unlock(); |
2f77fc4b DG |
837 | return ret; |
838 | } | |
839 | ||
840 | /* | |
841 | * Create a socket to the relayd using the URI. | |
842 | * | |
843 | * On success, the relayd_sock pointer is set to the created socket. | |
844 | * Else, it's stays untouched and a lttcomm error code is returned. | |
845 | */ | |
6151a90f | 846 | static int create_connect_relayd(struct lttng_uri *uri, |
b31610f2 JD |
847 | struct lttcomm_relayd_sock **relayd_sock, |
848 | struct consumer_output *consumer) | |
2f77fc4b DG |
849 | { |
850 | int ret; | |
6151a90f | 851 | struct lttcomm_relayd_sock *rsock; |
2f77fc4b | 852 | |
6151a90f JD |
853 | rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR, |
854 | RELAYD_VERSION_COMM_MINOR); | |
855 | if (!rsock) { | |
f73fabfd | 856 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
857 | goto error; |
858 | } | |
859 | ||
ffe60014 DG |
860 | /* |
861 | * Connect to relayd so we can proceed with a session creation. This call | |
862 | * can possibly block for an arbitrary amount of time to set the health | |
863 | * state to be in poll execution. | |
864 | */ | |
865 | health_poll_entry(); | |
6151a90f | 866 | ret = relayd_connect(rsock); |
ffe60014 | 867 | health_poll_exit(); |
2f77fc4b DG |
868 | if (ret < 0) { |
869 | ERR("Unable to reach lttng-relayd"); | |
f73fabfd | 870 | ret = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
871 | goto free_sock; |
872 | } | |
873 | ||
874 | /* Create socket for control stream. */ | |
875 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
876 | DBG3("Creating relayd stream socket from URI"); | |
877 | ||
878 | /* Check relayd version */ | |
6151a90f | 879 | ret = relayd_version_check(rsock); |
2f77fc4b | 880 | if (ret < 0) { |
f73fabfd | 881 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; |
2f77fc4b DG |
882 | goto close_sock; |
883 | } | |
b31610f2 JD |
884 | consumer->relay_major_version = rsock->major; |
885 | consumer->relay_minor_version = rsock->minor; | |
2f77fc4b DG |
886 | } else if (uri->stype == LTTNG_STREAM_DATA) { |
887 | DBG3("Creating relayd data socket from URI"); | |
888 | } else { | |
889 | /* Command is not valid */ | |
890 | ERR("Relayd invalid stream type: %d", uri->stype); | |
f73fabfd | 891 | ret = LTTNG_ERR_INVALID; |
2f77fc4b DG |
892 | goto close_sock; |
893 | } | |
894 | ||
6151a90f | 895 | *relayd_sock = rsock; |
2f77fc4b | 896 | |
f73fabfd | 897 | return LTTNG_OK; |
2f77fc4b DG |
898 | |
899 | close_sock: | |
6151a90f JD |
900 | /* The returned value is not useful since we are on an error path. */ |
901 | (void) relayd_close(rsock); | |
2f77fc4b | 902 | free_sock: |
6151a90f | 903 | free(rsock); |
2f77fc4b DG |
904 | error: |
905 | return ret; | |
906 | } | |
907 | ||
908 | /* | |
909 | * Connect to the relayd using URI and send the socket to the right consumer. | |
910 | */ | |
56a37563 JG |
911 | static int send_consumer_relayd_socket(enum lttng_domain_type domain, |
912 | unsigned int session_id, struct lttng_uri *relayd_uri, | |
913 | struct consumer_output *consumer, | |
d3e2ba59 JD |
914 | struct consumer_socket *consumer_sock, |
915 | char *session_name, char *hostname, int session_live_timer) | |
2f77fc4b DG |
916 | { |
917 | int ret; | |
6151a90f | 918 | struct lttcomm_relayd_sock *rsock = NULL; |
2f77fc4b | 919 | |
ffe60014 | 920 | /* Connect to relayd and make version check if uri is the control. */ |
b31610f2 | 921 | ret = create_connect_relayd(relayd_uri, &rsock, consumer); |
ffe60014 | 922 | if (ret != LTTNG_OK) { |
6151a90f | 923 | goto error; |
ffe60014 | 924 | } |
6151a90f | 925 | assert(rsock); |
ffe60014 | 926 | |
2f77fc4b | 927 | /* Set the network sequence index if not set. */ |
d88aee68 DG |
928 | if (consumer->net_seq_index == (uint64_t) -1ULL) { |
929 | pthread_mutex_lock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
930 | /* |
931 | * Increment net_seq_idx because we are about to transfer the | |
932 | * new relayd socket to the consumer. | |
d88aee68 | 933 | * Assign unique key so the consumer can match streams. |
2f77fc4b | 934 | */ |
d88aee68 DG |
935 | consumer->net_seq_index = ++relayd_net_seq_idx; |
936 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
937 | } |
938 | ||
2f77fc4b | 939 | /* Send relayd socket to consumer. */ |
6151a90f | 940 | ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer, |
d3e2ba59 JD |
941 | relayd_uri->stype, session_id, |
942 | session_name, hostname, session_live_timer); | |
2f77fc4b | 943 | if (ret < 0) { |
f73fabfd | 944 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
945 | goto close_sock; |
946 | } | |
947 | ||
c890b720 DG |
948 | /* Flag that the corresponding socket was sent. */ |
949 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
ffe60014 | 950 | consumer_sock->control_sock_sent = 1; |
c890b720 | 951 | } else if (relayd_uri->stype == LTTNG_STREAM_DATA) { |
ffe60014 | 952 | consumer_sock->data_sock_sent = 1; |
c890b720 DG |
953 | } |
954 | ||
f73fabfd | 955 | ret = LTTNG_OK; |
2f77fc4b DG |
956 | |
957 | /* | |
958 | * Close socket which was dup on the consumer side. The session daemon does | |
959 | * NOT keep track of the relayd socket(s) once transfer to the consumer. | |
960 | */ | |
961 | ||
962 | close_sock: | |
6151a90f JD |
963 | (void) relayd_close(rsock); |
964 | free(rsock); | |
2f77fc4b | 965 | |
6151a90f | 966 | error: |
ffe60014 DG |
967 | if (ret != LTTNG_OK) { |
968 | /* | |
d9078d0c DG |
969 | * The consumer output for this session should not be used anymore |
970 | * since the relayd connection failed thus making any tracing or/and | |
971 | * streaming not usable. | |
ffe60014 | 972 | */ |
d9078d0c | 973 | consumer->enabled = 0; |
ffe60014 | 974 | } |
2f77fc4b DG |
975 | return ret; |
976 | } | |
977 | ||
978 | /* | |
979 | * Send both relayd sockets to a specific consumer and domain. This is a | |
980 | * helper function to facilitate sending the information to the consumer for a | |
981 | * session. | |
982 | */ | |
56a37563 JG |
983 | static int send_consumer_relayd_sockets(enum lttng_domain_type domain, |
984 | unsigned int session_id, struct consumer_output *consumer, | |
985 | struct consumer_socket *sock, char *session_name, | |
986 | char *hostname, int session_live_timer) | |
2f77fc4b | 987 | { |
dda67f6c | 988 | int ret = LTTNG_OK; |
2f77fc4b | 989 | |
2f77fc4b | 990 | assert(consumer); |
6dc3064a | 991 | assert(sock); |
2f77fc4b | 992 | |
2f77fc4b | 993 | /* Sending control relayd socket. */ |
ffe60014 | 994 | if (!sock->control_sock_sent) { |
6dc3064a | 995 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
996 | &consumer->dst.net.control, consumer, sock, |
997 | session_name, hostname, session_live_timer); | |
c890b720 DG |
998 | if (ret != LTTNG_OK) { |
999 | goto error; | |
1000 | } | |
2f77fc4b DG |
1001 | } |
1002 | ||
1003 | /* Sending data relayd socket. */ | |
ffe60014 | 1004 | if (!sock->data_sock_sent) { |
6dc3064a | 1005 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
1006 | &consumer->dst.net.data, consumer, sock, |
1007 | session_name, hostname, session_live_timer); | |
c890b720 DG |
1008 | if (ret != LTTNG_OK) { |
1009 | goto error; | |
1010 | } | |
2f77fc4b DG |
1011 | } |
1012 | ||
2f77fc4b DG |
1013 | error: |
1014 | return ret; | |
1015 | } | |
1016 | ||
1017 | /* | |
1018 | * Setup relayd connections for a tracing session. First creates the socket to | |
1019 | * the relayd and send them to the right domain consumer. Consumer type MUST be | |
1020 | * network. | |
1021 | */ | |
ffe60014 | 1022 | int cmd_setup_relayd(struct ltt_session *session) |
2f77fc4b | 1023 | { |
f73fabfd | 1024 | int ret = LTTNG_OK; |
2f77fc4b DG |
1025 | struct ltt_ust_session *usess; |
1026 | struct ltt_kernel_session *ksess; | |
1027 | struct consumer_socket *socket; | |
1028 | struct lttng_ht_iter iter; | |
1029 | ||
1030 | assert(session); | |
1031 | ||
1032 | usess = session->ust_session; | |
1033 | ksess = session->kernel_session; | |
1034 | ||
785d2d0d | 1035 | DBG("Setting relayd for session %s", session->name); |
2f77fc4b | 1036 | |
e7fe706f DG |
1037 | rcu_read_lock(); |
1038 | ||
2f77fc4b DG |
1039 | if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET |
1040 | && usess->consumer->enabled) { | |
1041 | /* For each consumer socket, send relayd sockets */ | |
1042 | cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, | |
1043 | socket, node.node) { | |
2f77fc4b | 1044 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1045 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id, |
d3e2ba59 JD |
1046 | usess->consumer, socket, |
1047 | session->name, session->hostname, | |
1048 | session->live_timer); | |
2f77fc4b | 1049 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1050 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1051 | goto error; |
1052 | } | |
6dc3064a DG |
1053 | /* Session is now ready for network streaming. */ |
1054 | session->net_handle = 1; | |
2f77fc4b | 1055 | } |
b31610f2 JD |
1056 | session->consumer->relay_major_version = |
1057 | usess->consumer->relay_major_version; | |
1058 | session->consumer->relay_minor_version = | |
1059 | usess->consumer->relay_minor_version; | |
2f77fc4b DG |
1060 | } |
1061 | ||
1062 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET | |
1063 | && ksess->consumer->enabled) { | |
1064 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1065 | socket, node.node) { | |
2f77fc4b | 1066 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1067 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id, |
d3e2ba59 JD |
1068 | ksess->consumer, socket, |
1069 | session->name, session->hostname, | |
1070 | session->live_timer); | |
2f77fc4b | 1071 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1072 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1073 | goto error; |
1074 | } | |
6dc3064a DG |
1075 | /* Session is now ready for network streaming. */ |
1076 | session->net_handle = 1; | |
2f77fc4b | 1077 | } |
b31610f2 JD |
1078 | session->consumer->relay_major_version = |
1079 | ksess->consumer->relay_major_version; | |
1080 | session->consumer->relay_minor_version = | |
1081 | ksess->consumer->relay_minor_version; | |
2f77fc4b DG |
1082 | } |
1083 | ||
1084 | error: | |
e7fe706f | 1085 | rcu_read_unlock(); |
2f77fc4b DG |
1086 | return ret; |
1087 | } | |
1088 | ||
9b6c7ec5 DG |
1089 | /* |
1090 | * Start a kernel session by opening all necessary streams. | |
1091 | */ | |
1092 | static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe) | |
1093 | { | |
1094 | int ret; | |
1095 | struct ltt_kernel_channel *kchan; | |
1096 | ||
1097 | /* Open kernel metadata */ | |
07b86b52 | 1098 | if (ksess->metadata == NULL && ksess->output_traces) { |
9b6c7ec5 DG |
1099 | ret = kernel_open_metadata(ksess); |
1100 | if (ret < 0) { | |
1101 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1102 | goto error; | |
1103 | } | |
1104 | } | |
1105 | ||
1106 | /* Open kernel metadata stream */ | |
07b86b52 | 1107 | if (ksess->metadata && ksess->metadata_stream_fd < 0) { |
9b6c7ec5 DG |
1108 | ret = kernel_open_metadata_stream(ksess); |
1109 | if (ret < 0) { | |
1110 | ERR("Kernel create metadata stream failed"); | |
1111 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1112 | goto error; | |
1113 | } | |
1114 | } | |
1115 | ||
1116 | /* For each channel */ | |
1117 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
1118 | if (kchan->stream_count == 0) { | |
1119 | ret = kernel_open_channel_stream(kchan); | |
1120 | if (ret < 0) { | |
1121 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1122 | goto error; | |
1123 | } | |
1124 | /* Update the stream global counter */ | |
1125 | ksess->stream_count_global += ret; | |
1126 | } | |
1127 | } | |
1128 | ||
1129 | /* Setup kernel consumer socket and send fds to it */ | |
1130 | ret = init_kernel_tracing(ksess); | |
e43c41c5 | 1131 | if (ret != 0) { |
9b6c7ec5 DG |
1132 | ret = LTTNG_ERR_KERN_START_FAIL; |
1133 | goto error; | |
1134 | } | |
1135 | ||
1136 | /* This start the kernel tracing */ | |
1137 | ret = kernel_start_session(ksess); | |
1138 | if (ret < 0) { | |
1139 | ret = LTTNG_ERR_KERN_START_FAIL; | |
1140 | goto error; | |
1141 | } | |
1142 | ||
1143 | /* Quiescent wait after starting trace */ | |
784303b0 | 1144 | kernel_wait_quiescent(kernel_tracer_fd); |
9b6c7ec5 | 1145 | |
14fb1ebe | 1146 | ksess->active = 1; |
9b6c7ec5 DG |
1147 | |
1148 | ret = LTTNG_OK; | |
1149 | ||
1150 | error: | |
1151 | return ret; | |
1152 | } | |
1153 | ||
2f77fc4b DG |
1154 | /* |
1155 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. | |
1156 | */ | |
56a37563 JG |
1157 | int cmd_disable_channel(struct ltt_session *session, |
1158 | enum lttng_domain_type domain, char *channel_name) | |
2f77fc4b DG |
1159 | { |
1160 | int ret; | |
1161 | struct ltt_ust_session *usess; | |
1162 | ||
1163 | usess = session->ust_session; | |
1164 | ||
2223c96f DG |
1165 | rcu_read_lock(); |
1166 | ||
2f77fc4b DG |
1167 | switch (domain) { |
1168 | case LTTNG_DOMAIN_KERNEL: | |
1169 | { | |
1170 | ret = channel_kernel_disable(session->kernel_session, | |
1171 | channel_name); | |
f73fabfd | 1172 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1173 | goto error; |
1174 | } | |
1175 | ||
1176 | kernel_wait_quiescent(kernel_tracer_fd); | |
1177 | break; | |
1178 | } | |
1179 | case LTTNG_DOMAIN_UST: | |
1180 | { | |
1181 | struct ltt_ust_channel *uchan; | |
1182 | struct lttng_ht *chan_ht; | |
1183 | ||
1184 | chan_ht = usess->domain_global.channels; | |
1185 | ||
1186 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
1187 | if (uchan == NULL) { | |
f73fabfd | 1188 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
1189 | goto error; |
1190 | } | |
1191 | ||
7972aab2 | 1192 | ret = channel_ust_disable(usess, uchan); |
f73fabfd | 1193 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1194 | goto error; |
1195 | } | |
1196 | break; | |
1197 | } | |
2f77fc4b | 1198 | default: |
f73fabfd | 1199 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1200 | goto error; |
1201 | } | |
1202 | ||
f73fabfd | 1203 | ret = LTTNG_OK; |
2f77fc4b DG |
1204 | |
1205 | error: | |
2223c96f | 1206 | rcu_read_unlock(); |
2f77fc4b DG |
1207 | return ret; |
1208 | } | |
1209 | ||
ccf10263 MD |
1210 | /* |
1211 | * Command LTTNG_TRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1212 | * |
1213 | * Called with session lock held. | |
ccf10263 | 1214 | */ |
56a37563 JG |
1215 | int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1216 | int pid) | |
ccf10263 MD |
1217 | { |
1218 | int ret; | |
1219 | ||
1220 | rcu_read_lock(); | |
1221 | ||
1222 | switch (domain) { | |
1223 | case LTTNG_DOMAIN_KERNEL: | |
1224 | { | |
1225 | struct ltt_kernel_session *ksess; | |
1226 | ||
1227 | ksess = session->kernel_session; | |
1228 | ||
1229 | ret = kernel_track_pid(ksess, pid); | |
1230 | if (ret != LTTNG_OK) { | |
1231 | goto error; | |
1232 | } | |
1233 | ||
1234 | kernel_wait_quiescent(kernel_tracer_fd); | |
1235 | break; | |
1236 | } | |
ccf10263 | 1237 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1238 | { |
1239 | struct ltt_ust_session *usess; | |
1240 | ||
1241 | usess = session->ust_session; | |
1242 | ||
1243 | ret = trace_ust_track_pid(usess, pid); | |
1244 | if (ret != LTTNG_OK) { | |
1245 | goto error; | |
1246 | } | |
1247 | break; | |
1248 | } | |
ccf10263 MD |
1249 | default: |
1250 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1251 | goto error; | |
1252 | } | |
1253 | ||
1254 | ret = LTTNG_OK; | |
1255 | ||
1256 | error: | |
1257 | rcu_read_unlock(); | |
1258 | return ret; | |
1259 | } | |
1260 | ||
1261 | /* | |
1262 | * Command LTTNG_UNTRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1263 | * |
1264 | * Called with session lock held. | |
ccf10263 | 1265 | */ |
56a37563 JG |
1266 | int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1267 | int pid) | |
ccf10263 MD |
1268 | { |
1269 | int ret; | |
1270 | ||
1271 | rcu_read_lock(); | |
1272 | ||
1273 | switch (domain) { | |
1274 | case LTTNG_DOMAIN_KERNEL: | |
1275 | { | |
1276 | struct ltt_kernel_session *ksess; | |
1277 | ||
1278 | ksess = session->kernel_session; | |
1279 | ||
1280 | ret = kernel_untrack_pid(ksess, pid); | |
1281 | if (ret != LTTNG_OK) { | |
1282 | goto error; | |
1283 | } | |
1284 | ||
1285 | kernel_wait_quiescent(kernel_tracer_fd); | |
1286 | break; | |
1287 | } | |
ccf10263 | 1288 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1289 | { |
1290 | struct ltt_ust_session *usess; | |
1291 | ||
1292 | usess = session->ust_session; | |
1293 | ||
1294 | ret = trace_ust_untrack_pid(usess, pid); | |
1295 | if (ret != LTTNG_OK) { | |
1296 | goto error; | |
1297 | } | |
1298 | break; | |
1299 | } | |
ccf10263 MD |
1300 | default: |
1301 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1302 | goto error; | |
1303 | } | |
1304 | ||
1305 | ret = LTTNG_OK; | |
1306 | ||
1307 | error: | |
1308 | rcu_read_unlock(); | |
1309 | return ret; | |
1310 | } | |
1311 | ||
2f77fc4b DG |
1312 | /* |
1313 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
1314 | * | |
1315 | * The wpipe arguments is used as a notifier for the kernel thread. | |
1316 | */ | |
1317 | int cmd_enable_channel(struct ltt_session *session, | |
7972aab2 | 1318 | struct lttng_domain *domain, struct lttng_channel *attr, int wpipe) |
2f77fc4b DG |
1319 | { |
1320 | int ret; | |
1321 | struct ltt_ust_session *usess = session->ust_session; | |
1322 | struct lttng_ht *chan_ht; | |
1f345e94 | 1323 | size_t len; |
2f77fc4b DG |
1324 | |
1325 | assert(session); | |
1326 | assert(attr); | |
7972aab2 | 1327 | assert(domain); |
2f77fc4b | 1328 | |
f5436bfc | 1329 | len = lttng_strnlen(attr->name, sizeof(attr->name)); |
1f345e94 PP |
1330 | |
1331 | /* Validate channel name */ | |
1332 | if (attr->name[0] == '.' || | |
1333 | memchr(attr->name, '/', len) != NULL) { | |
1334 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1335 | goto end; | |
1336 | } | |
1337 | ||
2f77fc4b DG |
1338 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
1339 | ||
03b4fdcf DG |
1340 | rcu_read_lock(); |
1341 | ||
ecc48a90 JD |
1342 | /* |
1343 | * Don't try to enable a channel if the session has been started at | |
1344 | * some point in time before. The tracer does not allow it. | |
1345 | */ | |
8382cf6f | 1346 | if (session->has_been_started) { |
ecc48a90 JD |
1347 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
1348 | goto error; | |
1349 | } | |
1350 | ||
1351 | /* | |
1352 | * If the session is a live session, remove the switch timer, the | |
1353 | * live timer does the same thing but sends also synchronisation | |
1354 | * beacons for inactive streams. | |
1355 | */ | |
1356 | if (session->live_timer > 0) { | |
1357 | attr->attr.live_timer_interval = session->live_timer; | |
1358 | attr->attr.switch_timer_interval = 0; | |
1359 | } | |
1360 | ||
883d8478 JR |
1361 | /* Check for feature support */ |
1362 | switch (domain->type) { | |
1363 | case LTTNG_DOMAIN_KERNEL: | |
1364 | { | |
1365 | if (kernel_supports_ring_buffer_snapshot_sample_positions(kernel_tracer_fd) != 1) { | |
1366 | /* Sampling position of buffer is not supported */ | |
1367 | WARN("Kernel tracer does not support buffer monitoring. " | |
1368 | "Setting the monitor interval timer to 0 " | |
1369 | "(disabled) for channel '%s' of session '%s'", | |
1370 | attr-> name, session->name); | |
1371 | lttng_channel_set_monitor_timer_interval(attr, 0); | |
1372 | } | |
1373 | break; | |
1374 | } | |
1375 | case LTTNG_DOMAIN_UST: | |
1376 | case LTTNG_DOMAIN_JUL: | |
1377 | case LTTNG_DOMAIN_LOG4J: | |
1378 | case LTTNG_DOMAIN_PYTHON: | |
1379 | break; | |
1380 | default: | |
1381 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1382 | goto error; | |
1383 | } | |
1384 | ||
7972aab2 | 1385 | switch (domain->type) { |
2f77fc4b DG |
1386 | case LTTNG_DOMAIN_KERNEL: |
1387 | { | |
1388 | struct ltt_kernel_channel *kchan; | |
1389 | ||
2f77fc4b DG |
1390 | kchan = trace_kernel_get_channel_by_name(attr->name, |
1391 | session->kernel_session); | |
1392 | if (kchan == NULL) { | |
1393 | ret = channel_kernel_create(session->kernel_session, attr, wpipe); | |
85076754 MD |
1394 | if (attr->name[0] != '\0') { |
1395 | session->kernel_session->has_non_default_channel = 1; | |
1396 | } | |
2f77fc4b DG |
1397 | } else { |
1398 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
1399 | } | |
1400 | ||
f73fabfd | 1401 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1402 | goto error; |
1403 | } | |
1404 | ||
784303b0 | 1405 | kernel_wait_quiescent(kernel_tracer_fd); |
2f77fc4b DG |
1406 | break; |
1407 | } | |
1408 | case LTTNG_DOMAIN_UST: | |
9232818f JG |
1409 | case LTTNG_DOMAIN_JUL: |
1410 | case LTTNG_DOMAIN_LOG4J: | |
1411 | case LTTNG_DOMAIN_PYTHON: | |
2f77fc4b DG |
1412 | { |
1413 | struct ltt_ust_channel *uchan; | |
1414 | ||
9232818f JG |
1415 | /* |
1416 | * FIXME | |
1417 | * | |
1418 | * Current agent implementation limitations force us to allow | |
1419 | * only one channel at once in "agent" subdomains. Each | |
1420 | * subdomain has a default channel name which must be strictly | |
1421 | * adhered to. | |
1422 | */ | |
1423 | if (domain->type == LTTNG_DOMAIN_JUL) { | |
1424 | if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME, | |
1425 | LTTNG_SYMBOL_NAME_LEN)) { | |
1426 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1427 | goto error; | |
1428 | } | |
1429 | } else if (domain->type == LTTNG_DOMAIN_LOG4J) { | |
1430 | if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME, | |
1431 | LTTNG_SYMBOL_NAME_LEN)) { | |
1432 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1433 | goto error; | |
1434 | } | |
1435 | } else if (domain->type == LTTNG_DOMAIN_PYTHON) { | |
1436 | if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME, | |
1437 | LTTNG_SYMBOL_NAME_LEN)) { | |
1438 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1439 | goto error; | |
1440 | } | |
1441 | } | |
1442 | ||
2f77fc4b DG |
1443 | chan_ht = usess->domain_global.channels; |
1444 | ||
1445 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); | |
1446 | if (uchan == NULL) { | |
7972aab2 | 1447 | ret = channel_ust_create(usess, attr, domain->buf_type); |
85076754 MD |
1448 | if (attr->name[0] != '\0') { |
1449 | usess->has_non_default_channel = 1; | |
1450 | } | |
2f77fc4b | 1451 | } else { |
7972aab2 | 1452 | ret = channel_ust_enable(usess, uchan); |
2f77fc4b DG |
1453 | } |
1454 | break; | |
1455 | } | |
2f77fc4b | 1456 | default: |
f73fabfd | 1457 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1458 | goto error; |
1459 | } | |
1460 | ||
1461 | error: | |
2223c96f | 1462 | rcu_read_unlock(); |
1f345e94 | 1463 | end: |
2f77fc4b DG |
1464 | return ret; |
1465 | } | |
1466 | ||
2f77fc4b DG |
1467 | /* |
1468 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1469 | */ | |
56a37563 JG |
1470 | int cmd_disable_event(struct ltt_session *session, |
1471 | enum lttng_domain_type domain, char *channel_name, | |
6e911cad | 1472 | struct lttng_event *event) |
2f77fc4b DG |
1473 | { |
1474 | int ret; | |
6e911cad MD |
1475 | char *event_name; |
1476 | ||
18a720cd MD |
1477 | DBG("Disable event command for event \'%s\'", event->name); |
1478 | ||
6e911cad MD |
1479 | event_name = event->name; |
1480 | ||
9b7431cf JG |
1481 | /* Error out on unhandled search criteria */ |
1482 | if (event->loglevel_type || event->loglevel != -1 || event->enabled | |
6e911cad | 1483 | || event->pid || event->filter || event->exclusion) { |
7076b56e JG |
1484 | ret = LTTNG_ERR_UNK; |
1485 | goto error; | |
6e911cad | 1486 | } |
2f77fc4b | 1487 | |
2223c96f DG |
1488 | rcu_read_lock(); |
1489 | ||
2f77fc4b DG |
1490 | switch (domain) { |
1491 | case LTTNG_DOMAIN_KERNEL: | |
1492 | { | |
1493 | struct ltt_kernel_channel *kchan; | |
1494 | struct ltt_kernel_session *ksess; | |
1495 | ||
1496 | ksess = session->kernel_session; | |
1497 | ||
85076754 MD |
1498 | /* |
1499 | * If a non-default channel has been created in the | |
1500 | * session, explicitely require that -c chan_name needs | |
1501 | * to be provided. | |
1502 | */ | |
1503 | if (ksess->has_non_default_channel && channel_name[0] == '\0') { | |
1504 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1505 | goto error_unlock; |
85076754 MD |
1506 | } |
1507 | ||
2f77fc4b DG |
1508 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
1509 | if (kchan == NULL) { | |
f73fabfd | 1510 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
7076b56e | 1511 | goto error_unlock; |
2f77fc4b DG |
1512 | } |
1513 | ||
6e911cad MD |
1514 | switch (event->type) { |
1515 | case LTTNG_EVENT_ALL: | |
9550ee81 | 1516 | case LTTNG_EVENT_TRACEPOINT: |
d0ae4ea8 | 1517 | case LTTNG_EVENT_SYSCALL: |
9550ee81 JR |
1518 | case LTTNG_EVENT_PROBE: |
1519 | case LTTNG_EVENT_FUNCTION: | |
1520 | case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */ | |
1521 | if (event_name[0] == '\0') { | |
1522 | ret = event_kernel_disable_event(kchan, | |
1523 | NULL, event->type); | |
29c62722 | 1524 | } else { |
d0ae4ea8 | 1525 | ret = event_kernel_disable_event(kchan, |
9550ee81 | 1526 | event_name, event->type); |
29c62722 | 1527 | } |
6e911cad | 1528 | if (ret != LTTNG_OK) { |
7076b56e | 1529 | goto error_unlock; |
6e911cad MD |
1530 | } |
1531 | break; | |
6e911cad MD |
1532 | default: |
1533 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1534 | goto error_unlock; |
2f77fc4b DG |
1535 | } |
1536 | ||
1537 | kernel_wait_quiescent(kernel_tracer_fd); | |
1538 | break; | |
1539 | } | |
1540 | case LTTNG_DOMAIN_UST: | |
1541 | { | |
1542 | struct ltt_ust_channel *uchan; | |
1543 | struct ltt_ust_session *usess; | |
1544 | ||
1545 | usess = session->ust_session; | |
1546 | ||
7076b56e JG |
1547 | if (validate_ust_event_name(event_name)) { |
1548 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1549 | goto error_unlock; | |
1550 | } | |
1551 | ||
85076754 MD |
1552 | /* |
1553 | * If a non-default channel has been created in the | |
9550ee81 | 1554 | * session, explicitly require that -c chan_name needs |
85076754 MD |
1555 | * to be provided. |
1556 | */ | |
1557 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1558 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1559 | goto error_unlock; |
85076754 MD |
1560 | } |
1561 | ||
2f77fc4b DG |
1562 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
1563 | channel_name); | |
1564 | if (uchan == NULL) { | |
f73fabfd | 1565 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
7076b56e | 1566 | goto error_unlock; |
2f77fc4b DG |
1567 | } |
1568 | ||
6e911cad MD |
1569 | switch (event->type) { |
1570 | case LTTNG_EVENT_ALL: | |
b3639870 JR |
1571 | /* |
1572 | * An empty event name means that everything | |
1573 | * should be disabled. | |
1574 | */ | |
1575 | if (event->name[0] == '\0') { | |
1576 | ret = event_ust_disable_all_tracepoints(usess, uchan); | |
77d536b2 JR |
1577 | } else { |
1578 | ret = event_ust_disable_tracepoint(usess, uchan, | |
1579 | event_name); | |
1580 | } | |
6e911cad | 1581 | if (ret != LTTNG_OK) { |
7076b56e | 1582 | goto error_unlock; |
6e911cad MD |
1583 | } |
1584 | break; | |
1585 | default: | |
1586 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1587 | goto error_unlock; |
2f77fc4b DG |
1588 | } |
1589 | ||
1590 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
1591 | channel_name); | |
1592 | break; | |
1593 | } | |
5cdb6027 | 1594 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1595 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1596 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1597 | { |
fefd409b | 1598 | struct agent *agt; |
f20baf8e DG |
1599 | struct ltt_ust_session *usess = session->ust_session; |
1600 | ||
1601 | assert(usess); | |
1602 | ||
6e911cad MD |
1603 | switch (event->type) { |
1604 | case LTTNG_EVENT_ALL: | |
1605 | break; | |
1606 | default: | |
1607 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1608 | goto error_unlock; |
6e911cad MD |
1609 | } |
1610 | ||
5cdb6027 | 1611 | agt = trace_ust_find_agent(usess, domain); |
fefd409b DG |
1612 | if (!agt) { |
1613 | ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
7076b56e | 1614 | goto error_unlock; |
fefd409b | 1615 | } |
b3639870 JR |
1616 | /* |
1617 | * An empty event name means that everything | |
1618 | * should be disabled. | |
1619 | */ | |
1620 | if (event->name[0] == '\0') { | |
18a720cd MD |
1621 | ret = event_agent_disable_all(usess, agt); |
1622 | } else { | |
1623 | ret = event_agent_disable(usess, agt, event_name); | |
1624 | } | |
f20baf8e | 1625 | if (ret != LTTNG_OK) { |
7076b56e | 1626 | goto error_unlock; |
f20baf8e DG |
1627 | } |
1628 | ||
1629 | break; | |
1630 | } | |
2f77fc4b | 1631 | default: |
f73fabfd | 1632 | ret = LTTNG_ERR_UND; |
7076b56e | 1633 | goto error_unlock; |
2f77fc4b DG |
1634 | } |
1635 | ||
f73fabfd | 1636 | ret = LTTNG_OK; |
2f77fc4b | 1637 | |
7076b56e | 1638 | error_unlock: |
2223c96f | 1639 | rcu_read_unlock(); |
7076b56e | 1640 | error: |
2f77fc4b DG |
1641 | return ret; |
1642 | } | |
1643 | ||
2f77fc4b DG |
1644 | /* |
1645 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1646 | */ | |
56a37563 | 1647 | int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain, |
601d5acf | 1648 | char *channel_name, struct lttng_event_context *ctx, int kwpipe) |
2f77fc4b | 1649 | { |
d5979e4a | 1650 | int ret, chan_kern_created = 0, chan_ust_created = 0; |
bdf64013 JG |
1651 | char *app_ctx_provider_name = NULL, *app_ctx_name = NULL; |
1652 | ||
1653 | if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
1654 | app_ctx_provider_name = ctx->u.app_ctx.provider_name; | |
1655 | app_ctx_name = ctx->u.app_ctx.ctx_name; | |
1656 | } | |
2f77fc4b DG |
1657 | |
1658 | switch (domain) { | |
1659 | case LTTNG_DOMAIN_KERNEL: | |
979e618e DG |
1660 | assert(session->kernel_session); |
1661 | ||
1662 | if (session->kernel_session->channel_count == 0) { | |
1663 | /* Create default channel */ | |
1664 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); | |
1665 | if (ret != LTTNG_OK) { | |
1666 | goto error; | |
1667 | } | |
d5979e4a | 1668 | chan_kern_created = 1; |
979e618e | 1669 | } |
2f77fc4b | 1670 | /* Add kernel context to kernel tracer */ |
601d5acf | 1671 | ret = context_kernel_add(session->kernel_session, ctx, channel_name); |
f73fabfd | 1672 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1673 | goto error; |
1674 | } | |
1675 | break; | |
bdf64013 JG |
1676 | case LTTNG_DOMAIN_JUL: |
1677 | case LTTNG_DOMAIN_LOG4J: | |
1678 | { | |
1679 | /* | |
1680 | * Validate channel name. | |
1681 | * If no channel name is given and the domain is JUL or LOG4J, | |
1682 | * set it to the appropriate domain-specific channel name. If | |
1683 | * a name is provided but does not match the expexted channel | |
1684 | * name, return an error. | |
1685 | */ | |
1686 | if (domain == LTTNG_DOMAIN_JUL && *channel_name && | |
1687 | strcmp(channel_name, | |
1688 | DEFAULT_JUL_CHANNEL_NAME)) { | |
1689 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1690 | goto error; | |
1691 | } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name && | |
1692 | strcmp(channel_name, | |
1693 | DEFAULT_LOG4J_CHANNEL_NAME)) { | |
1694 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1695 | goto error; | |
1696 | } | |
a93b3916 | 1697 | /* break is _not_ missing here. */ |
bdf64013 | 1698 | } |
2f77fc4b DG |
1699 | case LTTNG_DOMAIN_UST: |
1700 | { | |
1701 | struct ltt_ust_session *usess = session->ust_session; | |
85076754 MD |
1702 | unsigned int chan_count; |
1703 | ||
2f77fc4b DG |
1704 | assert(usess); |
1705 | ||
85076754 | 1706 | chan_count = lttng_ht_get_count(usess->domain_global.channels); |
979e618e DG |
1707 | if (chan_count == 0) { |
1708 | struct lttng_channel *attr; | |
1709 | /* Create default channel */ | |
0a9c6494 | 1710 | attr = channel_new_default_attr(domain, usess->buffer_type); |
979e618e DG |
1711 | if (attr == NULL) { |
1712 | ret = LTTNG_ERR_FATAL; | |
1713 | goto error; | |
1714 | } | |
1715 | ||
7972aab2 | 1716 | ret = channel_ust_create(usess, attr, usess->buffer_type); |
979e618e DG |
1717 | if (ret != LTTNG_OK) { |
1718 | free(attr); | |
1719 | goto error; | |
1720 | } | |
cf0bcb51 | 1721 | channel_attr_destroy(attr); |
d5979e4a | 1722 | chan_ust_created = 1; |
979e618e DG |
1723 | } |
1724 | ||
601d5acf | 1725 | ret = context_ust_add(usess, domain, ctx, channel_name); |
bdf64013 JG |
1726 | free(app_ctx_provider_name); |
1727 | free(app_ctx_name); | |
1728 | app_ctx_name = NULL; | |
1729 | app_ctx_provider_name = NULL; | |
f73fabfd | 1730 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1731 | goto error; |
1732 | } | |
1733 | break; | |
1734 | } | |
2f77fc4b | 1735 | default: |
f73fabfd | 1736 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1737 | goto error; |
1738 | } | |
1739 | ||
bdf64013 JG |
1740 | ret = LTTNG_OK; |
1741 | goto end; | |
2f77fc4b DG |
1742 | |
1743 | error: | |
d5979e4a DG |
1744 | if (chan_kern_created) { |
1745 | struct ltt_kernel_channel *kchan = | |
1746 | trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME, | |
1747 | session->kernel_session); | |
1748 | /* Created previously, this should NOT fail. */ | |
1749 | assert(kchan); | |
1750 | kernel_destroy_channel(kchan); | |
1751 | } | |
1752 | ||
1753 | if (chan_ust_created) { | |
1754 | struct ltt_ust_channel *uchan = | |
1755 | trace_ust_find_channel_by_name( | |
1756 | session->ust_session->domain_global.channels, | |
1757 | DEFAULT_CHANNEL_NAME); | |
1758 | /* Created previously, this should NOT fail. */ | |
1759 | assert(uchan); | |
1760 | /* Remove from the channel list of the session. */ | |
1761 | trace_ust_delete_channel(session->ust_session->domain_global.channels, | |
1762 | uchan); | |
1763 | trace_ust_destroy_channel(uchan); | |
1764 | } | |
bdf64013 JG |
1765 | end: |
1766 | free(app_ctx_provider_name); | |
1767 | free(app_ctx_name); | |
2f77fc4b DG |
1768 | return ret; |
1769 | } | |
1770 | ||
dac8e046 JG |
1771 | static inline bool name_starts_with(const char *name, const char *prefix) |
1772 | { | |
1773 | const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN); | |
1774 | ||
1775 | return !strncmp(name, prefix, max_cmp_len); | |
1776 | } | |
1777 | ||
1778 | /* Perform userspace-specific event name validation */ | |
1779 | static int validate_ust_event_name(const char *name) | |
1780 | { | |
1781 | int ret = 0; | |
1782 | ||
1783 | if (!name) { | |
1784 | ret = -1; | |
1785 | goto end; | |
1786 | } | |
1787 | ||
1788 | /* | |
1789 | * Check name against all internal UST event component namespaces used | |
1790 | * by the agents. | |
1791 | */ | |
1792 | if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) || | |
1793 | name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) || | |
1794 | name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) { | |
1795 | ret = -1; | |
1796 | } | |
1797 | ||
1798 | end: | |
1799 | return ret; | |
1800 | } | |
88f06f15 | 1801 | |
2f77fc4b | 1802 | /* |
88f06f15 JG |
1803 | * Internal version of cmd_enable_event() with a supplemental |
1804 | * "internal_event" flag which is used to enable internal events which should | |
1805 | * be hidden from clients. Such events are used in the agent implementation to | |
1806 | * enable the events through which all "agent" events are funeled. | |
2f77fc4b | 1807 | */ |
88f06f15 JG |
1808 | static int _cmd_enable_event(struct ltt_session *session, |
1809 | struct lttng_domain *domain, | |
025faf73 | 1810 | char *channel_name, struct lttng_event *event, |
6b453b5e | 1811 | char *filter_expression, |
db8f1377 JI |
1812 | struct lttng_filter_bytecode *filter, |
1813 | struct lttng_event_exclusion *exclusion, | |
88f06f15 | 1814 | int wpipe, bool internal_event) |
2f77fc4b | 1815 | { |
9f449915 | 1816 | int ret = 0, channel_created = 0; |
cfedea03 | 1817 | struct lttng_channel *attr = NULL; |
2f77fc4b DG |
1818 | |
1819 | assert(session); | |
1820 | assert(event); | |
1821 | assert(channel_name); | |
1822 | ||
2a385866 JG |
1823 | /* If we have a filter, we must have its filter expression */ |
1824 | assert(!(!!filter_expression ^ !!filter)); | |
1825 | ||
9f449915 PP |
1826 | /* Normalize event name as a globbing pattern */ |
1827 | strutils_normalize_star_glob_pattern(event->name); | |
18a720cd | 1828 | |
9f449915 PP |
1829 | /* Normalize exclusion names as globbing patterns */ |
1830 | if (exclusion) { | |
1831 | size_t i; | |
f5ac4bd7 | 1832 | |
9f449915 PP |
1833 | for (i = 0; i < exclusion->count; i++) { |
1834 | char *name = LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i); | |
1835 | ||
1836 | strutils_normalize_star_glob_pattern(name); | |
1837 | } | |
930a2e99 JG |
1838 | } |
1839 | ||
9f449915 PP |
1840 | DBG("Enable event command for event \'%s\'", event->name); |
1841 | ||
1842 | rcu_read_lock(); | |
1843 | ||
7972aab2 | 1844 | switch (domain->type) { |
2f77fc4b DG |
1845 | case LTTNG_DOMAIN_KERNEL: |
1846 | { | |
1847 | struct ltt_kernel_channel *kchan; | |
1848 | ||
85076754 MD |
1849 | /* |
1850 | * If a non-default channel has been created in the | |
1851 | * session, explicitely require that -c chan_name needs | |
1852 | * to be provided. | |
1853 | */ | |
1854 | if (session->kernel_session->has_non_default_channel | |
1855 | && channel_name[0] == '\0') { | |
1856 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1857 | goto error; | |
1858 | } | |
1859 | ||
2f77fc4b DG |
1860 | kchan = trace_kernel_get_channel_by_name(channel_name, |
1861 | session->kernel_session); | |
1862 | if (kchan == NULL) { | |
0a9c6494 DG |
1863 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
1864 | LTTNG_BUFFER_GLOBAL); | |
2f77fc4b | 1865 | if (attr == NULL) { |
f73fabfd | 1866 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1867 | goto error; |
1868 | } | |
04c17253 MD |
1869 | if (lttng_strncpy(attr->name, channel_name, |
1870 | sizeof(attr->name))) { | |
1871 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
1872 | goto error; |
1873 | } | |
2f77fc4b DG |
1874 | |
1875 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1876 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1877 | goto error; |
1878 | } | |
e5f5db7f | 1879 | channel_created = 1; |
2f77fc4b DG |
1880 | } |
1881 | ||
1882 | /* Get the newly created kernel channel pointer */ | |
1883 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1884 | session->kernel_session); | |
1885 | if (kchan == NULL) { | |
1886 | /* This sould not happen... */ | |
f73fabfd | 1887 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1888 | goto error; |
1889 | } | |
1890 | ||
6e911cad MD |
1891 | switch (event->type) { |
1892 | case LTTNG_EVENT_ALL: | |
29c62722 | 1893 | { |
00a62084 MD |
1894 | char *filter_expression_a = NULL; |
1895 | struct lttng_filter_bytecode *filter_a = NULL; | |
1896 | ||
1897 | /* | |
1898 | * We need to duplicate filter_expression and filter, | |
1899 | * because ownership is passed to first enable | |
1900 | * event. | |
1901 | */ | |
1902 | if (filter_expression) { | |
1903 | filter_expression_a = strdup(filter_expression); | |
1904 | if (!filter_expression_a) { | |
1905 | ret = LTTNG_ERR_FATAL; | |
1906 | goto error; | |
1907 | } | |
1908 | } | |
1909 | if (filter) { | |
1910 | filter_a = zmalloc(sizeof(*filter_a) + filter->len); | |
1911 | if (!filter_a) { | |
1912 | free(filter_expression_a); | |
1913 | ret = LTTNG_ERR_FATAL; | |
1914 | goto error; | |
1915 | } | |
1916 | memcpy(filter_a, filter, sizeof(*filter_a) + filter->len); | |
1917 | } | |
29c62722 | 1918 | event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */ |
00a62084 MD |
1919 | ret = event_kernel_enable_event(kchan, event, |
1920 | filter_expression, filter); | |
a969e101 MD |
1921 | /* We have passed ownership */ |
1922 | filter_expression = NULL; | |
1923 | filter = NULL; | |
29c62722 MD |
1924 | if (ret != LTTNG_OK) { |
1925 | if (channel_created) { | |
1926 | /* Let's not leak a useless channel. */ | |
1927 | kernel_destroy_channel(kchan); | |
1928 | } | |
00a62084 MD |
1929 | free(filter_expression_a); |
1930 | free(filter_a); | |
29c62722 MD |
1931 | goto error; |
1932 | } | |
1933 | event->type = LTTNG_EVENT_SYSCALL; /* Hack */ | |
00a62084 MD |
1934 | ret = event_kernel_enable_event(kchan, event, |
1935 | filter_expression_a, filter_a); | |
60d21fa2 AB |
1936 | /* We have passed ownership */ |
1937 | filter_expression_a = NULL; | |
1938 | filter_a = NULL; | |
29c62722 MD |
1939 | if (ret != LTTNG_OK) { |
1940 | goto error; | |
1941 | } | |
1942 | break; | |
1943 | } | |
6e6ef3d7 DG |
1944 | case LTTNG_EVENT_PROBE: |
1945 | case LTTNG_EVENT_FUNCTION: | |
1946 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
6e911cad | 1947 | case LTTNG_EVENT_TRACEPOINT: |
00a62084 MD |
1948 | ret = event_kernel_enable_event(kchan, event, |
1949 | filter_expression, filter); | |
a969e101 MD |
1950 | /* We have passed ownership */ |
1951 | filter_expression = NULL; | |
1952 | filter = NULL; | |
6e911cad MD |
1953 | if (ret != LTTNG_OK) { |
1954 | if (channel_created) { | |
1955 | /* Let's not leak a useless channel. */ | |
1956 | kernel_destroy_channel(kchan); | |
1957 | } | |
1958 | goto error; | |
e5f5db7f | 1959 | } |
6e911cad MD |
1960 | break; |
1961 | case LTTNG_EVENT_SYSCALL: | |
00a62084 MD |
1962 | ret = event_kernel_enable_event(kchan, event, |
1963 | filter_expression, filter); | |
a969e101 MD |
1964 | /* We have passed ownership */ |
1965 | filter_expression = NULL; | |
1966 | filter = NULL; | |
e2b957af MD |
1967 | if (ret != LTTNG_OK) { |
1968 | goto error; | |
1969 | } | |
6e911cad MD |
1970 | break; |
1971 | default: | |
1972 | ret = LTTNG_ERR_UNK; | |
2f77fc4b DG |
1973 | goto error; |
1974 | } | |
1975 | ||
1976 | kernel_wait_quiescent(kernel_tracer_fd); | |
1977 | break; | |
1978 | } | |
1979 | case LTTNG_DOMAIN_UST: | |
1980 | { | |
1981 | struct ltt_ust_channel *uchan; | |
1982 | struct ltt_ust_session *usess = session->ust_session; | |
1983 | ||
1984 | assert(usess); | |
1985 | ||
85076754 MD |
1986 | /* |
1987 | * If a non-default channel has been created in the | |
1988 | * session, explicitely require that -c chan_name needs | |
1989 | * to be provided. | |
1990 | */ | |
1991 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1992 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1993 | goto error; | |
1994 | } | |
1995 | ||
2f77fc4b DG |
1996 | /* Get channel from global UST domain */ |
1997 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
1998 | channel_name); | |
1999 | if (uchan == NULL) { | |
2000 | /* Create default channel */ | |
0a9c6494 DG |
2001 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
2002 | usess->buffer_type); | |
2f77fc4b | 2003 | if (attr == NULL) { |
f73fabfd | 2004 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2005 | goto error; |
2006 | } | |
04c17253 MD |
2007 | if (lttng_strncpy(attr->name, channel_name, |
2008 | sizeof(attr->name))) { | |
2009 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
2010 | goto error; |
2011 | } | |
2f77fc4b DG |
2012 | |
2013 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 2014 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2015 | goto error; |
2016 | } | |
2f77fc4b DG |
2017 | |
2018 | /* Get the newly created channel reference back */ | |
2019 | uchan = trace_ust_find_channel_by_name( | |
2020 | usess->domain_global.channels, channel_name); | |
2021 | assert(uchan); | |
2022 | } | |
2023 | ||
141feb8c JG |
2024 | if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) { |
2025 | /* | |
2026 | * Don't allow users to add UST events to channels which | |
2027 | * are assigned to a userspace subdomain (JUL, Log4J, | |
2028 | * Python, etc.). | |
2029 | */ | |
2030 | ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN; | |
2031 | goto error; | |
2032 | } | |
2033 | ||
dac8e046 JG |
2034 | if (!internal_event) { |
2035 | /* | |
2036 | * Ensure the event name is not reserved for internal | |
2037 | * use. | |
2038 | */ | |
2039 | ret = validate_ust_event_name(event->name); | |
2040 | if (ret) { | |
2041 | WARN("Userspace event name %s failed validation.", | |
2042 | event->name ? | |
2043 | event->name : "NULL"); | |
2044 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
2045 | goto error; | |
2046 | } | |
2047 | } | |
2048 | ||
2f77fc4b | 2049 | /* At this point, the session and channel exist on the tracer */ |
6b453b5e | 2050 | ret = event_ust_enable_tracepoint(usess, uchan, event, |
88f06f15 JG |
2051 | filter_expression, filter, exclusion, |
2052 | internal_event); | |
49d21f93 MD |
2053 | /* We have passed ownership */ |
2054 | filter_expression = NULL; | |
2055 | filter = NULL; | |
2056 | exclusion = NULL; | |
94382e15 JG |
2057 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2058 | goto already_enabled; | |
2059 | } else if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2060 | goto error; |
2061 | } | |
2062 | break; | |
2063 | } | |
5cdb6027 | 2064 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 2065 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2066 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 2067 | { |
da6c3a50 | 2068 | const char *default_event_name, *default_chan_name; |
fefd409b | 2069 | struct agent *agt; |
f20baf8e DG |
2070 | struct lttng_event uevent; |
2071 | struct lttng_domain tmp_dom; | |
2072 | struct ltt_ust_session *usess = session->ust_session; | |
2073 | ||
2074 | assert(usess); | |
2075 | ||
5cdb6027 | 2076 | agt = trace_ust_find_agent(usess, domain->type); |
fefd409b | 2077 | if (!agt) { |
5cdb6027 | 2078 | agt = agent_create(domain->type); |
fefd409b | 2079 | if (!agt) { |
e5b3c48c | 2080 | ret = LTTNG_ERR_NOMEM; |
fefd409b DG |
2081 | goto error; |
2082 | } | |
2083 | agent_add(agt, usess->agents); | |
2084 | } | |
2085 | ||
022d91ba | 2086 | /* Create the default tracepoint. */ |
996de3c7 | 2087 | memset(&uevent, 0, sizeof(uevent)); |
f20baf8e DG |
2088 | uevent.type = LTTNG_EVENT_TRACEPOINT; |
2089 | uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
51755dc8 JG |
2090 | default_event_name = event_get_default_agent_ust_name( |
2091 | domain->type); | |
da6c3a50 | 2092 | if (!default_event_name) { |
e5b3c48c | 2093 | ret = LTTNG_ERR_FATAL; |
da6c3a50 | 2094 | goto error; |
f43f95a9 | 2095 | } |
da6c3a50 | 2096 | strncpy(uevent.name, default_event_name, sizeof(uevent.name)); |
f20baf8e DG |
2097 | uevent.name[sizeof(uevent.name) - 1] = '\0'; |
2098 | ||
2099 | /* | |
2100 | * The domain type is changed because we are about to enable the | |
2101 | * default channel and event for the JUL domain that are hardcoded. | |
2102 | * This happens in the UST domain. | |
2103 | */ | |
2104 | memcpy(&tmp_dom, domain, sizeof(tmp_dom)); | |
2105 | tmp_dom.type = LTTNG_DOMAIN_UST; | |
2106 | ||
0e115563 DG |
2107 | switch (domain->type) { |
2108 | case LTTNG_DOMAIN_LOG4J: | |
da6c3a50 | 2109 | default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME; |
0e115563 DG |
2110 | break; |
2111 | case LTTNG_DOMAIN_JUL: | |
da6c3a50 | 2112 | default_chan_name = DEFAULT_JUL_CHANNEL_NAME; |
0e115563 DG |
2113 | break; |
2114 | case LTTNG_DOMAIN_PYTHON: | |
2115 | default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
2116 | break; | |
2117 | default: | |
e98a44b0 | 2118 | /* The switch/case we are in makes this impossible */ |
0e115563 | 2119 | assert(0); |
da6c3a50 DG |
2120 | } |
2121 | ||
971da06a | 2122 | { |
8404118c | 2123 | char *filter_expression_copy = NULL; |
51755dc8 | 2124 | struct lttng_filter_bytecode *filter_copy = NULL; |
971da06a JG |
2125 | |
2126 | if (filter) { | |
51755dc8 JG |
2127 | const size_t filter_size = sizeof( |
2128 | struct lttng_filter_bytecode) | |
2129 | + filter->len; | |
2130 | ||
2131 | filter_copy = zmalloc(filter_size); | |
971da06a | 2132 | if (!filter_copy) { |
018096a4 | 2133 | ret = LTTNG_ERR_NOMEM; |
b742e3e2 | 2134 | goto error; |
971da06a | 2135 | } |
51755dc8 | 2136 | memcpy(filter_copy, filter, filter_size); |
971da06a | 2137 | |
8404118c JG |
2138 | filter_expression_copy = |
2139 | strdup(filter_expression); | |
2140 | if (!filter_expression) { | |
2141 | ret = LTTNG_ERR_NOMEM; | |
51755dc8 JG |
2142 | } |
2143 | ||
2144 | if (!filter_expression_copy || !filter_copy) { | |
2145 | free(filter_expression_copy); | |
2146 | free(filter_copy); | |
2147 | goto error; | |
8404118c | 2148 | } |
971da06a JG |
2149 | } |
2150 | ||
88f06f15 | 2151 | ret = cmd_enable_event_internal(session, &tmp_dom, |
971da06a | 2152 | (char *) default_chan_name, |
8404118c JG |
2153 | &uevent, filter_expression_copy, |
2154 | filter_copy, NULL, wpipe); | |
971da06a JG |
2155 | } |
2156 | ||
94382e15 JG |
2157 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2158 | goto already_enabled; | |
2159 | } else if (ret != LTTNG_OK) { | |
f20baf8e DG |
2160 | goto error; |
2161 | } | |
2162 | ||
2163 | /* The wild card * means that everything should be enabled. */ | |
2164 | if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) { | |
8404118c JG |
2165 | ret = event_agent_enable_all(usess, agt, event, filter, |
2166 | filter_expression); | |
f20baf8e | 2167 | } else { |
8404118c JG |
2168 | ret = event_agent_enable(usess, agt, event, filter, |
2169 | filter_expression); | |
f20baf8e | 2170 | } |
51755dc8 JG |
2171 | filter = NULL; |
2172 | filter_expression = NULL; | |
f20baf8e DG |
2173 | if (ret != LTTNG_OK) { |
2174 | goto error; | |
2175 | } | |
2176 | ||
2177 | break; | |
2178 | } | |
2f77fc4b | 2179 | default: |
f73fabfd | 2180 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2181 | goto error; |
2182 | } | |
2183 | ||
f73fabfd | 2184 | ret = LTTNG_OK; |
2f77fc4b | 2185 | |
94382e15 | 2186 | already_enabled: |
2f77fc4b | 2187 | error: |
49d21f93 MD |
2188 | free(filter_expression); |
2189 | free(filter); | |
2190 | free(exclusion); | |
cf0bcb51 | 2191 | channel_attr_destroy(attr); |
2223c96f | 2192 | rcu_read_unlock(); |
2f77fc4b DG |
2193 | return ret; |
2194 | } | |
2195 | ||
88f06f15 JG |
2196 | /* |
2197 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2198 | * We own filter, exclusion, and filter_expression. | |
2199 | */ | |
2200 | int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain, | |
2201 | char *channel_name, struct lttng_event *event, | |
2202 | char *filter_expression, | |
2203 | struct lttng_filter_bytecode *filter, | |
2204 | struct lttng_event_exclusion *exclusion, | |
2205 | int wpipe) | |
2206 | { | |
2207 | return _cmd_enable_event(session, domain, channel_name, event, | |
2208 | filter_expression, filter, exclusion, wpipe, false); | |
2209 | } | |
2210 | ||
2211 | /* | |
2212 | * Enable an event which is internal to LTTng. An internal should | |
2213 | * never be made visible to clients and are immune to checks such as | |
2214 | * reserved names. | |
2215 | */ | |
2216 | static int cmd_enable_event_internal(struct ltt_session *session, | |
2217 | struct lttng_domain *domain, | |
2218 | char *channel_name, struct lttng_event *event, | |
2219 | char *filter_expression, | |
2220 | struct lttng_filter_bytecode *filter, | |
2221 | struct lttng_event_exclusion *exclusion, | |
2222 | int wpipe) | |
2223 | { | |
2224 | return _cmd_enable_event(session, domain, channel_name, event, | |
2225 | filter_expression, filter, exclusion, wpipe, true); | |
2226 | } | |
2227 | ||
2f77fc4b DG |
2228 | /* |
2229 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2230 | */ | |
56a37563 JG |
2231 | ssize_t cmd_list_tracepoints(enum lttng_domain_type domain, |
2232 | struct lttng_event **events) | |
2f77fc4b DG |
2233 | { |
2234 | int ret; | |
2235 | ssize_t nb_events = 0; | |
2236 | ||
2237 | switch (domain) { | |
2238 | case LTTNG_DOMAIN_KERNEL: | |
2239 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2240 | if (nb_events < 0) { | |
f73fabfd | 2241 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
2f77fc4b DG |
2242 | goto error; |
2243 | } | |
2244 | break; | |
2245 | case LTTNG_DOMAIN_UST: | |
2246 | nb_events = ust_app_list_events(events); | |
2247 | if (nb_events < 0) { | |
f73fabfd | 2248 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2249 | goto error; |
2250 | } | |
2251 | break; | |
5cdb6027 | 2252 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2253 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2254 | case LTTNG_DOMAIN_PYTHON: |
f60140a1 | 2255 | nb_events = agent_list_events(events, domain); |
3c6a091f DG |
2256 | if (nb_events < 0) { |
2257 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2258 | goto error; | |
2259 | } | |
2260 | break; | |
2f77fc4b | 2261 | default: |
f73fabfd | 2262 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2263 | goto error; |
2264 | } | |
2265 | ||
2266 | return nb_events; | |
2267 | ||
2268 | error: | |
2269 | /* Return negative value to differentiate return code */ | |
2270 | return -ret; | |
2271 | } | |
2272 | ||
2273 | /* | |
2274 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
2275 | */ | |
56a37563 | 2276 | ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain, |
2f77fc4b DG |
2277 | struct lttng_event_field **fields) |
2278 | { | |
2279 | int ret; | |
2280 | ssize_t nb_fields = 0; | |
2281 | ||
2282 | switch (domain) { | |
2283 | case LTTNG_DOMAIN_UST: | |
2284 | nb_fields = ust_app_list_event_fields(fields); | |
2285 | if (nb_fields < 0) { | |
f73fabfd | 2286 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2287 | goto error; |
2288 | } | |
2289 | break; | |
2290 | case LTTNG_DOMAIN_KERNEL: | |
2291 | default: /* fall-through */ | |
f73fabfd | 2292 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2293 | goto error; |
2294 | } | |
2295 | ||
2296 | return nb_fields; | |
2297 | ||
2298 | error: | |
2299 | /* Return negative value to differentiate return code */ | |
2300 | return -ret; | |
2301 | } | |
2302 | ||
834978fd DG |
2303 | ssize_t cmd_list_syscalls(struct lttng_event **events) |
2304 | { | |
2305 | return syscall_table_list(events); | |
2306 | } | |
2307 | ||
a5dfbb9d MD |
2308 | /* |
2309 | * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread. | |
2310 | * | |
2311 | * Called with session lock held. | |
2312 | */ | |
2313 | ssize_t cmd_list_tracker_pids(struct ltt_session *session, | |
56a37563 | 2314 | enum lttng_domain_type domain, int32_t **pids) |
a5dfbb9d MD |
2315 | { |
2316 | int ret; | |
2317 | ssize_t nr_pids = 0; | |
2318 | ||
2319 | switch (domain) { | |
2320 | case LTTNG_DOMAIN_KERNEL: | |
2321 | { | |
2322 | struct ltt_kernel_session *ksess; | |
2323 | ||
2324 | ksess = session->kernel_session; | |
2325 | nr_pids = kernel_list_tracker_pids(ksess, pids); | |
2326 | if (nr_pids < 0) { | |
2327 | ret = LTTNG_ERR_KERN_LIST_FAIL; | |
2328 | goto error; | |
2329 | } | |
2330 | break; | |
2331 | } | |
2332 | case LTTNG_DOMAIN_UST: | |
2333 | { | |
2334 | struct ltt_ust_session *usess; | |
2335 | ||
2336 | usess = session->ust_session; | |
2337 | nr_pids = trace_ust_list_tracker_pids(usess, pids); | |
2338 | if (nr_pids < 0) { | |
2339 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2340 | goto error; | |
2341 | } | |
2342 | break; | |
2343 | } | |
2344 | case LTTNG_DOMAIN_LOG4J: | |
2345 | case LTTNG_DOMAIN_JUL: | |
2346 | case LTTNG_DOMAIN_PYTHON: | |
2347 | default: | |
2348 | ret = LTTNG_ERR_UND; | |
2349 | goto error; | |
2350 | } | |
2351 | ||
2352 | return nr_pids; | |
2353 | ||
2354 | error: | |
2355 | /* Return negative value to differentiate return code */ | |
2356 | return -ret; | |
2357 | } | |
2358 | ||
2f77fc4b DG |
2359 | /* |
2360 | * Command LTTNG_START_TRACE processed by the client thread. | |
a9ad0c8f MD |
2361 | * |
2362 | * Called with session mutex held. | |
2f77fc4b DG |
2363 | */ |
2364 | int cmd_start_trace(struct ltt_session *session) | |
2365 | { | |
2366 | int ret; | |
cde3e505 | 2367 | unsigned long nb_chan = 0; |
2f77fc4b DG |
2368 | struct ltt_kernel_session *ksession; |
2369 | struct ltt_ust_session *usess; | |
2f77fc4b DG |
2370 | |
2371 | assert(session); | |
2372 | ||
2373 | /* Ease our life a bit ;) */ | |
2374 | ksession = session->kernel_session; | |
2375 | usess = session->ust_session; | |
2376 | ||
8382cf6f DG |
2377 | /* Is the session already started? */ |
2378 | if (session->active) { | |
f73fabfd | 2379 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2380 | goto error; |
2381 | } | |
2382 | ||
cde3e505 DG |
2383 | /* |
2384 | * Starting a session without channel is useless since after that it's not | |
2385 | * possible to enable channel thus inform the client. | |
2386 | */ | |
2387 | if (usess && usess->domain_global.channels) { | |
2388 | nb_chan += lttng_ht_get_count(usess->domain_global.channels); | |
2389 | } | |
2390 | if (ksession) { | |
2391 | nb_chan += ksession->channel_count; | |
2392 | } | |
2393 | if (!nb_chan) { | |
2394 | ret = LTTNG_ERR_NO_CHANNEL; | |
2395 | goto error; | |
2396 | } | |
2397 | ||
2f77fc4b DG |
2398 | /* Kernel tracing */ |
2399 | if (ksession != NULL) { | |
9b6c7ec5 DG |
2400 | ret = start_kernel_session(ksession, kernel_tracer_fd); |
2401 | if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2402 | goto error; |
2403 | } | |
2f77fc4b DG |
2404 | } |
2405 | ||
2406 | /* Flag session that trace should start automatically */ | |
2407 | if (usess) { | |
14fb1ebe DG |
2408 | /* |
2409 | * Even though the start trace might fail, flag this session active so | |
2410 | * other application coming in are started by default. | |
2411 | */ | |
2412 | usess->active = 1; | |
2f77fc4b DG |
2413 | |
2414 | ret = ust_app_start_trace_all(usess); | |
2415 | if (ret < 0) { | |
f73fabfd | 2416 | ret = LTTNG_ERR_UST_START_FAIL; |
2f77fc4b DG |
2417 | goto error; |
2418 | } | |
2419 | } | |
2420 | ||
8382cf6f DG |
2421 | /* Flag this after a successful start. */ |
2422 | session->has_been_started = 1; | |
2423 | session->active = 1; | |
9b6c7ec5 | 2424 | |
f73fabfd | 2425 | ret = LTTNG_OK; |
2f77fc4b DG |
2426 | |
2427 | error: | |
2428 | return ret; | |
2429 | } | |
2430 | ||
2431 | /* | |
2432 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2433 | */ | |
2434 | int cmd_stop_trace(struct ltt_session *session) | |
2435 | { | |
2436 | int ret; | |
2437 | struct ltt_kernel_channel *kchan; | |
2438 | struct ltt_kernel_session *ksession; | |
2439 | struct ltt_ust_session *usess; | |
2440 | ||
2441 | assert(session); | |
2442 | ||
2443 | /* Short cut */ | |
2444 | ksession = session->kernel_session; | |
2445 | usess = session->ust_session; | |
2446 | ||
8382cf6f DG |
2447 | /* Session is not active. Skip everythong and inform the client. */ |
2448 | if (!session->active) { | |
f73fabfd | 2449 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
2f77fc4b DG |
2450 | goto error; |
2451 | } | |
2452 | ||
2f77fc4b | 2453 | /* Kernel tracer */ |
14fb1ebe | 2454 | if (ksession && ksession->active) { |
2f77fc4b DG |
2455 | DBG("Stop kernel tracing"); |
2456 | ||
566d8970 MD |
2457 | ret = kernel_stop_session(ksession); |
2458 | if (ret < 0) { | |
2459 | ret = LTTNG_ERR_KERN_STOP_FAIL; | |
2460 | goto error; | |
2461 | } | |
2462 | ||
2463 | kernel_wait_quiescent(kernel_tracer_fd); | |
2464 | ||
2465 | /* Flush metadata after stopping (if exists) */ | |
2f77fc4b DG |
2466 | if (ksession->metadata_stream_fd >= 0) { |
2467 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2468 | if (ret < 0) { | |
2469 | ERR("Kernel metadata flush failed"); | |
2470 | } | |
2471 | } | |
2472 | ||
566d8970 | 2473 | /* Flush all buffers after stopping */ |
2f77fc4b DG |
2474 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2475 | ret = kernel_flush_buffer(kchan); | |
2476 | if (ret < 0) { | |
2477 | ERR("Kernel flush buffer error"); | |
2478 | } | |
2479 | } | |
2480 | ||
14fb1ebe | 2481 | ksession->active = 0; |
2f77fc4b DG |
2482 | } |
2483 | ||
14fb1ebe DG |
2484 | if (usess && usess->active) { |
2485 | /* | |
2486 | * Even though the stop trace might fail, flag this session inactive so | |
2487 | * other application coming in are not started by default. | |
2488 | */ | |
2489 | usess->active = 0; | |
2f77fc4b DG |
2490 | |
2491 | ret = ust_app_stop_trace_all(usess); | |
2492 | if (ret < 0) { | |
f73fabfd | 2493 | ret = LTTNG_ERR_UST_STOP_FAIL; |
2f77fc4b DG |
2494 | goto error; |
2495 | } | |
2496 | } | |
2497 | ||
8382cf6f DG |
2498 | /* Flag inactive after a successful stop. */ |
2499 | session->active = 0; | |
f73fabfd | 2500 | ret = LTTNG_OK; |
2f77fc4b DG |
2501 | |
2502 | error: | |
2503 | return ret; | |
2504 | } | |
2505 | ||
2506 | /* | |
2507 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
2508 | */ | |
bda32d56 JG |
2509 | int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri, |
2510 | struct lttng_uri *uris) | |
2f77fc4b DG |
2511 | { |
2512 | int ret, i; | |
2513 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2514 | struct ltt_ust_session *usess = session->ust_session; | |
2f77fc4b DG |
2515 | |
2516 | assert(session); | |
2517 | assert(uris); | |
2518 | assert(nb_uri > 0); | |
2519 | ||
8382cf6f DG |
2520 | /* Can't set consumer URI if the session is active. */ |
2521 | if (session->active) { | |
f73fabfd | 2522 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2523 | goto error; |
2524 | } | |
2525 | ||
bda32d56 | 2526 | /* Set the "global" consumer URIs */ |
2f77fc4b | 2527 | for (i = 0; i < nb_uri; i++) { |
bda32d56 JG |
2528 | ret = add_uri_to_consumer(session->consumer, |
2529 | &uris[i], 0, session->name); | |
a74934ba | 2530 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2531 | goto error; |
2532 | } | |
2f77fc4b DG |
2533 | } |
2534 | ||
bda32d56 JG |
2535 | /* Set UST session URIs */ |
2536 | if (session->ust_session) { | |
2537 | for (i = 0; i < nb_uri; i++) { | |
2538 | ret = add_uri_to_consumer( | |
2539 | session->ust_session->consumer, | |
2540 | &uris[i], LTTNG_DOMAIN_UST, | |
2541 | session->name); | |
2542 | if (ret != LTTNG_OK) { | |
2543 | goto error; | |
2544 | } | |
2545 | } | |
2546 | } | |
2547 | ||
2548 | /* Set kernel session URIs */ | |
2549 | if (session->kernel_session) { | |
2550 | for (i = 0; i < nb_uri; i++) { | |
2551 | ret = add_uri_to_consumer( | |
2552 | session->kernel_session->consumer, | |
2553 | &uris[i], LTTNG_DOMAIN_KERNEL, | |
2554 | session->name); | |
2555 | if (ret != LTTNG_OK) { | |
2556 | goto error; | |
2557 | } | |
2558 | } | |
2559 | } | |
2560 | ||
7ab70fe0 DG |
2561 | /* |
2562 | * Make sure to set the session in output mode after we set URI since a | |
2563 | * session can be created without URL (thus flagged in no output mode). | |
2564 | */ | |
2565 | session->output_traces = 1; | |
2566 | if (ksess) { | |
2567 | ksess->output_traces = 1; | |
bda32d56 JG |
2568 | } |
2569 | ||
2570 | if (usess) { | |
7ab70fe0 DG |
2571 | usess->output_traces = 1; |
2572 | } | |
2573 | ||
2f77fc4b | 2574 | /* All good! */ |
f73fabfd | 2575 | ret = LTTNG_OK; |
2f77fc4b DG |
2576 | |
2577 | error: | |
2578 | return ret; | |
2579 | } | |
2580 | ||
2581 | /* | |
2582 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2583 | */ | |
2584 | int cmd_create_session_uri(char *name, struct lttng_uri *uris, | |
ecc48a90 | 2585 | size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer) |
2f77fc4b DG |
2586 | { |
2587 | int ret; | |
2f77fc4b DG |
2588 | struct ltt_session *session; |
2589 | ||
2590 | assert(name); | |
2bba9e53 | 2591 | assert(creds); |
785d2d0d | 2592 | |
2f77fc4b DG |
2593 | /* |
2594 | * Verify if the session already exist | |
2595 | * | |
2596 | * XXX: There is no need for the session lock list here since the caller | |
2597 | * (process_client_msg) is holding it. We might want to change that so a | |
2598 | * single command does not lock the entire session list. | |
2599 | */ | |
2600 | session = session_find_by_name(name); | |
2601 | if (session != NULL) { | |
f73fabfd | 2602 | ret = LTTNG_ERR_EXIST_SESS; |
2f77fc4b DG |
2603 | goto find_error; |
2604 | } | |
2605 | ||
2606 | /* Create tracing session in the registry */ | |
dec56f6c | 2607 | ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds), |
2f77fc4b | 2608 | LTTNG_SOCK_GET_GID_CRED(creds)); |
f73fabfd | 2609 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2610 | goto session_error; |
2611 | } | |
2612 | ||
2613 | /* | |
2614 | * Get the newly created session pointer back | |
2615 | * | |
2616 | * XXX: There is no need for the session lock list here since the caller | |
2617 | * (process_client_msg) is holding it. We might want to change that so a | |
2618 | * single command does not lock the entire session list. | |
2619 | */ | |
2620 | session = session_find_by_name(name); | |
2621 | assert(session); | |
2622 | ||
ecc48a90 | 2623 | session->live_timer = live_timer; |
2f77fc4b DG |
2624 | /* Create default consumer output for the session not yet created. */ |
2625 | session->consumer = consumer_create_output(CONSUMER_DST_LOCAL); | |
2626 | if (session->consumer == NULL) { | |
f73fabfd | 2627 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2628 | goto consumer_error; |
2629 | } | |
2630 | ||
2bba9e53 | 2631 | if (uris) { |
bda32d56 | 2632 | ret = cmd_set_consumer_uri(session, nb_uri, uris); |
2bba9e53 DG |
2633 | if (ret != LTTNG_OK) { |
2634 | goto consumer_error; | |
2635 | } | |
2636 | session->output_traces = 1; | |
2637 | } else { | |
2638 | session->output_traces = 0; | |
2639 | DBG2("Session %s created with no output", session->name); | |
2f77fc4b DG |
2640 | } |
2641 | ||
2642 | session->consumer->enabled = 1; | |
2643 | ||
f73fabfd | 2644 | return LTTNG_OK; |
2f77fc4b DG |
2645 | |
2646 | consumer_error: | |
2647 | session_destroy(session); | |
2648 | session_error: | |
2649 | find_error: | |
2650 | return ret; | |
2651 | } | |
2652 | ||
27babd3a DG |
2653 | /* |
2654 | * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread. | |
2655 | */ | |
2656 | int cmd_create_session_snapshot(char *name, struct lttng_uri *uris, | |
2657 | size_t nb_uri, lttng_sock_cred *creds) | |
2658 | { | |
2659 | int ret; | |
2660 | struct ltt_session *session; | |
2661 | struct snapshot_output *new_output = NULL; | |
2662 | ||
2663 | assert(name); | |
2664 | assert(creds); | |
2665 | ||
2666 | /* | |
2667 | * Create session in no output mode with URIs set to NULL. The uris we've | |
2668 | * received are for a default snapshot output if one. | |
2669 | */ | |
ae58b817 | 2670 | ret = cmd_create_session_uri(name, NULL, 0, creds, 0); |
27babd3a DG |
2671 | if (ret != LTTNG_OK) { |
2672 | goto error; | |
2673 | } | |
2674 | ||
2675 | /* Get the newly created session pointer back. This should NEVER fail. */ | |
2676 | session = session_find_by_name(name); | |
2677 | assert(session); | |
2678 | ||
2679 | /* Flag session for snapshot mode. */ | |
2680 | session->snapshot_mode = 1; | |
2681 | ||
2682 | /* Skip snapshot output creation if no URI is given. */ | |
2683 | if (nb_uri == 0) { | |
2684 | goto end; | |
2685 | } | |
2686 | ||
2687 | new_output = snapshot_output_alloc(); | |
2688 | if (!new_output) { | |
2689 | ret = LTTNG_ERR_NOMEM; | |
2690 | goto error_snapshot_alloc; | |
2691 | } | |
2692 | ||
2693 | ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL, | |
2694 | uris, nb_uri, session->consumer, new_output, &session->snapshot); | |
2695 | if (ret < 0) { | |
2696 | if (ret == -ENOMEM) { | |
2697 | ret = LTTNG_ERR_NOMEM; | |
2698 | } else { | |
2699 | ret = LTTNG_ERR_INVALID; | |
2700 | } | |
2701 | goto error_snapshot; | |
2702 | } | |
2703 | ||
2704 | rcu_read_lock(); | |
2705 | snapshot_add_output(&session->snapshot, new_output); | |
2706 | rcu_read_unlock(); | |
2707 | ||
2708 | end: | |
2709 | return LTTNG_OK; | |
2710 | ||
2711 | error_snapshot: | |
2712 | snapshot_output_destroy(new_output); | |
2713 | error_snapshot_alloc: | |
2714 | session_destroy(session); | |
2715 | error: | |
2716 | return ret; | |
2717 | } | |
2718 | ||
2f77fc4b DG |
2719 | /* |
2720 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
a9ad0c8f MD |
2721 | * |
2722 | * Called with session lock held. | |
2f77fc4b DG |
2723 | */ |
2724 | int cmd_destroy_session(struct ltt_session *session, int wpipe) | |
2725 | { | |
2726 | int ret; | |
2727 | struct ltt_ust_session *usess; | |
2728 | struct ltt_kernel_session *ksess; | |
2729 | ||
2730 | /* Safety net */ | |
2731 | assert(session); | |
2732 | ||
2733 | usess = session->ust_session; | |
2734 | ksess = session->kernel_session; | |
2735 | ||
2736 | /* Clean kernel session teardown */ | |
2737 | kernel_destroy_session(ksess); | |
2738 | ||
2739 | /* UST session teardown */ | |
2740 | if (usess) { | |
2741 | /* Close any relayd session */ | |
2742 | consumer_output_send_destroy_relayd(usess->consumer); | |
2743 | ||
2744 | /* Destroy every UST application related to this session. */ | |
2745 | ret = ust_app_destroy_trace_all(usess); | |
2746 | if (ret) { | |
2747 | ERR("Error in ust_app_destroy_trace_all"); | |
2748 | } | |
2749 | ||
2750 | /* Clean up the rest. */ | |
2751 | trace_ust_destroy_session(usess); | |
2752 | } | |
2753 | ||
2754 | /* | |
2755 | * Must notify the kernel thread here to update it's poll set in order to | |
2756 | * remove the channel(s)' fd just destroyed. | |
2757 | */ | |
2758 | ret = notify_thread_pipe(wpipe); | |
2759 | if (ret < 0) { | |
2760 | PERROR("write kernel poll pipe"); | |
2761 | } | |
2762 | ||
2763 | ret = session_destroy(session); | |
2764 | ||
2765 | return ret; | |
2766 | } | |
2767 | ||
2f77fc4b DG |
2768 | /* |
2769 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
2770 | */ | |
56a37563 JG |
2771 | int cmd_register_consumer(struct ltt_session *session, |
2772 | enum lttng_domain_type domain, const char *sock_path, | |
2773 | struct consumer_data *cdata) | |
2f77fc4b DG |
2774 | { |
2775 | int ret, sock; | |
dd81b457 | 2776 | struct consumer_socket *socket = NULL; |
2f77fc4b DG |
2777 | |
2778 | assert(session); | |
2779 | assert(cdata); | |
2780 | assert(sock_path); | |
2781 | ||
2782 | switch (domain) { | |
2783 | case LTTNG_DOMAIN_KERNEL: | |
2784 | { | |
2785 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2786 | ||
2787 | assert(ksess); | |
2788 | ||
2789 | /* Can't register a consumer if there is already one */ | |
2790 | if (ksess->consumer_fds_sent != 0) { | |
f73fabfd | 2791 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
2792 | goto error; |
2793 | } | |
2794 | ||
2795 | sock = lttcomm_connect_unix_sock(sock_path); | |
2796 | if (sock < 0) { | |
f73fabfd | 2797 | ret = LTTNG_ERR_CONNECT_FAIL; |
2f77fc4b DG |
2798 | goto error; |
2799 | } | |
4ce514c4 | 2800 | cdata->cmd_sock = sock; |
2f77fc4b | 2801 | |
4ce514c4 | 2802 | socket = consumer_allocate_socket(&cdata->cmd_sock); |
2f77fc4b | 2803 | if (socket == NULL) { |
f66c074c DG |
2804 | ret = close(sock); |
2805 | if (ret < 0) { | |
2806 | PERROR("close register consumer"); | |
2807 | } | |
4ce514c4 | 2808 | cdata->cmd_sock = -1; |
f73fabfd | 2809 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2810 | goto error; |
2811 | } | |
2812 | ||
2813 | socket->lock = zmalloc(sizeof(pthread_mutex_t)); | |
2814 | if (socket->lock == NULL) { | |
2815 | PERROR("zmalloc pthread mutex"); | |
f73fabfd | 2816 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2817 | goto error; |
2818 | } | |
2819 | pthread_mutex_init(socket->lock, NULL); | |
2820 | socket->registered = 1; | |
2821 | ||
2822 | rcu_read_lock(); | |
2823 | consumer_add_socket(socket, ksess->consumer); | |
2824 | rcu_read_unlock(); | |
2825 | ||
2826 | pthread_mutex_lock(&cdata->pid_mutex); | |
2827 | cdata->pid = -1; | |
2828 | pthread_mutex_unlock(&cdata->pid_mutex); | |
2829 | ||
2830 | break; | |
2831 | } | |
2832 | default: | |
2833 | /* TODO: Userspace tracing */ | |
f73fabfd | 2834 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2835 | goto error; |
2836 | } | |
2837 | ||
dd81b457 | 2838 | return LTTNG_OK; |
2f77fc4b DG |
2839 | |
2840 | error: | |
dd81b457 DG |
2841 | if (socket) { |
2842 | consumer_destroy_socket(socket); | |
2843 | } | |
2f77fc4b DG |
2844 | return ret; |
2845 | } | |
2846 | ||
2847 | /* | |
2848 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
2849 | */ | |
2850 | ssize_t cmd_list_domains(struct ltt_session *session, | |
2851 | struct lttng_domain **domains) | |
2852 | { | |
2853 | int ret, index = 0; | |
2854 | ssize_t nb_dom = 0; | |
fefd409b DG |
2855 | struct agent *agt; |
2856 | struct lttng_ht_iter iter; | |
2f77fc4b DG |
2857 | |
2858 | if (session->kernel_session != NULL) { | |
2859 | DBG3("Listing domains found kernel domain"); | |
2860 | nb_dom++; | |
2861 | } | |
2862 | ||
2863 | if (session->ust_session != NULL) { | |
2864 | DBG3("Listing domains found UST global domain"); | |
2865 | nb_dom++; | |
3c6a091f | 2866 | |
e0a74f01 | 2867 | rcu_read_lock(); |
fefd409b DG |
2868 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2869 | agt, node.node) { | |
2870 | if (agt->being_used) { | |
2871 | nb_dom++; | |
2872 | } | |
3c6a091f | 2873 | } |
e0a74f01 | 2874 | rcu_read_unlock(); |
2f77fc4b DG |
2875 | } |
2876 | ||
fa64dfb4 JG |
2877 | if (!nb_dom) { |
2878 | goto end; | |
2879 | } | |
2880 | ||
2f77fc4b DG |
2881 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
2882 | if (*domains == NULL) { | |
f73fabfd | 2883 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2884 | goto error; |
2885 | } | |
2886 | ||
2887 | if (session->kernel_session != NULL) { | |
2888 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
b5edb9e8 PP |
2889 | |
2890 | /* Kernel session buffer type is always GLOBAL */ | |
2891 | (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL; | |
2892 | ||
2f77fc4b DG |
2893 | index++; |
2894 | } | |
2895 | ||
2896 | if (session->ust_session != NULL) { | |
2897 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
88c5f0d8 | 2898 | (*domains)[index].buf_type = session->ust_session->buffer_type; |
2f77fc4b | 2899 | index++; |
3c6a091f | 2900 | |
e0a74f01 | 2901 | rcu_read_lock(); |
fefd409b DG |
2902 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2903 | agt, node.node) { | |
2904 | if (agt->being_used) { | |
2905 | (*domains)[index].type = agt->domain; | |
2906 | (*domains)[index].buf_type = session->ust_session->buffer_type; | |
2907 | index++; | |
2908 | } | |
3c6a091f | 2909 | } |
e0a74f01 | 2910 | rcu_read_unlock(); |
2f77fc4b | 2911 | } |
fa64dfb4 | 2912 | end: |
2f77fc4b DG |
2913 | return nb_dom; |
2914 | ||
2915 | error: | |
f73fabfd DG |
2916 | /* Return negative value to differentiate return code */ |
2917 | return -ret; | |
2f77fc4b DG |
2918 | } |
2919 | ||
2920 | ||
2921 | /* | |
2922 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
2923 | */ | |
56a37563 JG |
2924 | ssize_t cmd_list_channels(enum lttng_domain_type domain, |
2925 | struct ltt_session *session, struct lttng_channel **channels) | |
2f77fc4b | 2926 | { |
53e367f9 | 2927 | ssize_t nb_chan = 0, payload_size = 0, ret; |
2f77fc4b DG |
2928 | |
2929 | switch (domain) { | |
2930 | case LTTNG_DOMAIN_KERNEL: | |
2931 | if (session->kernel_session != NULL) { | |
2932 | nb_chan = session->kernel_session->channel_count; | |
2933 | } | |
2934 | DBG3("Number of kernel channels %zd", nb_chan); | |
c7d620a2 | 2935 | if (nb_chan <= 0) { |
53e367f9 JG |
2936 | ret = -LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2937 | goto end; | |
c7d620a2 | 2938 | } |
2f77fc4b DG |
2939 | break; |
2940 | case LTTNG_DOMAIN_UST: | |
2941 | if (session->ust_session != NULL) { | |
7ffc31a2 | 2942 | rcu_read_lock(); |
2f77fc4b | 2943 | nb_chan = lttng_ht_get_count( |
7ffc31a2 JG |
2944 | session->ust_session->domain_global.channels); |
2945 | rcu_read_unlock(); | |
2f77fc4b DG |
2946 | } |
2947 | DBG3("Number of UST global channels %zd", nb_chan); | |
ade7ce52 | 2948 | if (nb_chan < 0) { |
53e367f9 JG |
2949 | ret = -LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2950 | goto end; | |
c7d620a2 | 2951 | } |
2f77fc4b DG |
2952 | break; |
2953 | default: | |
53e367f9 JG |
2954 | ret = -LTTNG_ERR_UND; |
2955 | goto end; | |
2f77fc4b DG |
2956 | } |
2957 | ||
2958 | if (nb_chan > 0) { | |
53e367f9 | 2959 | const size_t channel_size = sizeof(struct lttng_channel) + |
cf0bcb51 JG |
2960 | sizeof(struct lttng_channel_extended); |
2961 | struct lttng_channel_extended *channel_exts; | |
53e367f9 JG |
2962 | |
2963 | payload_size = nb_chan * channel_size; | |
2964 | *channels = zmalloc(payload_size); | |
2f77fc4b | 2965 | if (*channels == NULL) { |
53e367f9 JG |
2966 | ret = -LTTNG_ERR_FATAL; |
2967 | goto end; | |
2f77fc4b DG |
2968 | } |
2969 | ||
53e367f9 JG |
2970 | channel_exts = ((void *) *channels) + |
2971 | (nb_chan * sizeof(struct lttng_channel)); | |
b958c3ad MD |
2972 | ret = list_lttng_channels(domain, session, *channels, channel_exts); |
2973 | if (ret != LTTNG_OK) { | |
2974 | free(*channels); | |
2975 | *channels = NULL; | |
2976 | goto end; | |
2977 | } | |
53e367f9 JG |
2978 | } else { |
2979 | *channels = NULL; | |
2f77fc4b DG |
2980 | } |
2981 | ||
53e367f9 JG |
2982 | ret = payload_size; |
2983 | end: | |
2984 | return ret; | |
2f77fc4b DG |
2985 | } |
2986 | ||
2987 | /* | |
2988 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
2989 | */ | |
56a37563 JG |
2990 | ssize_t cmd_list_events(enum lttng_domain_type domain, |
2991 | struct ltt_session *session, char *channel_name, | |
b4e3ceb9 | 2992 | struct lttng_event **events, size_t *total_size) |
2f77fc4b DG |
2993 | { |
2994 | int ret = 0; | |
2995 | ssize_t nb_event = 0; | |
2996 | ||
2997 | switch (domain) { | |
2998 | case LTTNG_DOMAIN_KERNEL: | |
2999 | if (session->kernel_session != NULL) { | |
3000 | nb_event = list_lttng_kernel_events(channel_name, | |
b4e3ceb9 PP |
3001 | session->kernel_session, events, |
3002 | total_size); | |
2f77fc4b DG |
3003 | } |
3004 | break; | |
3005 | case LTTNG_DOMAIN_UST: | |
3006 | { | |
3007 | if (session->ust_session != NULL) { | |
3008 | nb_event = list_lttng_ust_global_events(channel_name, | |
b4e3ceb9 PP |
3009 | &session->ust_session->domain_global, events, |
3010 | total_size); | |
2f77fc4b DG |
3011 | } |
3012 | break; | |
3013 | } | |
5cdb6027 | 3014 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 3015 | case LTTNG_DOMAIN_JUL: |
0e115563 | 3016 | case LTTNG_DOMAIN_PYTHON: |
3c6a091f | 3017 | if (session->ust_session) { |
fefd409b DG |
3018 | struct lttng_ht_iter iter; |
3019 | struct agent *agt; | |
3020 | ||
b11feea5 | 3021 | rcu_read_lock(); |
fefd409b DG |
3022 | cds_lfht_for_each_entry(session->ust_session->agents->ht, |
3023 | &iter.iter, agt, node.node) { | |
1dfd9906 JG |
3024 | if (agt->domain == domain) { |
3025 | nb_event = list_lttng_agent_events( | |
b4e3ceb9 PP |
3026 | agt, events, |
3027 | total_size); | |
1dfd9906 JG |
3028 | break; |
3029 | } | |
fefd409b | 3030 | } |
b11feea5 | 3031 | rcu_read_unlock(); |
3c6a091f DG |
3032 | } |
3033 | break; | |
2f77fc4b | 3034 | default: |
f73fabfd | 3035 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3036 | goto error; |
3037 | } | |
3038 | ||
f73fabfd | 3039 | return nb_event; |
2f77fc4b DG |
3040 | |
3041 | error: | |
f73fabfd DG |
3042 | /* Return negative value to differentiate return code */ |
3043 | return -ret; | |
2f77fc4b DG |
3044 | } |
3045 | ||
3046 | /* | |
3047 | * Using the session list, filled a lttng_session array to send back to the | |
3048 | * client for session listing. | |
3049 | * | |
3050 | * The session list lock MUST be acquired before calling this function. Use | |
3051 | * session_lock_list() and session_unlock_list(). | |
3052 | */ | |
3053 | void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid, | |
3054 | gid_t gid) | |
3055 | { | |
3056 | int ret; | |
3057 | unsigned int i = 0; | |
3058 | struct ltt_session *session; | |
3059 | struct ltt_session_list *list = session_get_list(); | |
3060 | ||
3061 | DBG("Getting all available session for UID %d GID %d", | |
3062 | uid, gid); | |
3063 | /* | |
3064 | * Iterate over session list and append data after the control struct in | |
3065 | * the buffer. | |
3066 | */ | |
3067 | cds_list_for_each_entry(session, &list->head, list) { | |
3068 | /* | |
3069 | * Only list the sessions the user can control. | |
3070 | */ | |
3071 | if (!session_access_ok(session, uid, gid)) { | |
3072 | continue; | |
3073 | } | |
3074 | ||
3075 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3076 | struct ltt_ust_session *usess = session->ust_session; | |
3077 | ||
3078 | if (session->consumer->type == CONSUMER_DST_NET || | |
3079 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
3080 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
3081 | ret = build_network_session_path(sessions[i].path, | |
dec56f6c | 3082 | sizeof(sessions[i].path), session); |
2f77fc4b | 3083 | } else { |
dec56f6c | 3084 | ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s", |
2f77fc4b DG |
3085 | session->consumer->dst.trace_path); |
3086 | } | |
3087 | if (ret < 0) { | |
3088 | PERROR("snprintf session path"); | |
3089 | continue; | |
3090 | } | |
3091 | ||
3092 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
3093 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
8382cf6f | 3094 | sessions[i].enabled = session->active; |
2cbf8fed | 3095 | sessions[i].snapshot_mode = session->snapshot_mode; |
8960e9cd | 3096 | sessions[i].live_timer_interval = session->live_timer; |
2f77fc4b DG |
3097 | i++; |
3098 | } | |
3099 | } | |
3100 | ||
806e2684 | 3101 | /* |
6d805429 | 3102 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
d3f14b8a | 3103 | * ready for trace analysis (or any kind of reader) or else 1 for pending data. |
806e2684 | 3104 | */ |
6d805429 | 3105 | int cmd_data_pending(struct ltt_session *session) |
806e2684 DG |
3106 | { |
3107 | int ret; | |
3108 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3109 | struct ltt_ust_session *usess = session->ust_session; | |
3110 | ||
3111 | assert(session); | |
3112 | ||
3113 | /* Session MUST be stopped to ask for data availability. */ | |
8382cf6f | 3114 | if (session->active) { |
806e2684 DG |
3115 | ret = LTTNG_ERR_SESSION_STARTED; |
3116 | goto error; | |
3a89d11a DG |
3117 | } else { |
3118 | /* | |
3119 | * If stopped, just make sure we've started before else the above call | |
3120 | * will always send that there is data pending. | |
3121 | * | |
3122 | * The consumer assumes that when the data pending command is received, | |
3123 | * the trace has been started before or else no output data is written | |
3124 | * by the streams which is a condition for data pending. So, this is | |
3125 | * *VERY* important that we don't ask the consumer before a start | |
3126 | * trace. | |
3127 | */ | |
8382cf6f | 3128 | if (!session->has_been_started) { |
3a89d11a DG |
3129 | ret = 0; |
3130 | goto error; | |
3131 | } | |
806e2684 DG |
3132 | } |
3133 | ||
3134 | if (ksess && ksess->consumer) { | |
6d805429 DG |
3135 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
3136 | if (ret == 1) { | |
806e2684 DG |
3137 | /* Data is still being extracted for the kernel. */ |
3138 | goto error; | |
3139 | } | |
3140 | } | |
3141 | ||
3142 | if (usess && usess->consumer) { | |
6d805429 DG |
3143 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
3144 | if (ret == 1) { | |
806e2684 DG |
3145 | /* Data is still being extracted for the kernel. */ |
3146 | goto error; | |
3147 | } | |
3148 | } | |
3149 | ||
3150 | /* Data is ready to be read by a viewer */ | |
6d805429 | 3151 | ret = 0; |
806e2684 DG |
3152 | |
3153 | error: | |
3154 | return ret; | |
3155 | } | |
3156 | ||
6dc3064a DG |
3157 | /* |
3158 | * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library. | |
3159 | * | |
3160 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3161 | */ | |
3162 | int cmd_snapshot_add_output(struct ltt_session *session, | |
3163 | struct lttng_snapshot_output *output, uint32_t *id) | |
3164 | { | |
3165 | int ret; | |
3166 | struct snapshot_output *new_output; | |
3167 | ||
3168 | assert(session); | |
3169 | assert(output); | |
3170 | ||
3171 | DBG("Cmd snapshot add output for session %s", session->name); | |
3172 | ||
3173 | /* | |
903ef685 | 3174 | * Can't create an output if the session is not set in no-output mode. |
6dc3064a DG |
3175 | */ |
3176 | if (session->output_traces) { | |
903ef685 | 3177 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3178 | goto error; |
3179 | } | |
3180 | ||
3181 | /* Only one output is allowed until we have the "tee" feature. */ | |
3182 | if (session->snapshot.nb_output == 1) { | |
3183 | ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST; | |
3184 | goto error; | |
3185 | } | |
3186 | ||
3187 | new_output = snapshot_output_alloc(); | |
3188 | if (!new_output) { | |
3189 | ret = LTTNG_ERR_NOMEM; | |
3190 | goto error; | |
3191 | } | |
3192 | ||
3193 | ret = snapshot_output_init(output->max_size, output->name, | |
3194 | output->ctrl_url, output->data_url, session->consumer, new_output, | |
3195 | &session->snapshot); | |
3196 | if (ret < 0) { | |
3197 | if (ret == -ENOMEM) { | |
3198 | ret = LTTNG_ERR_NOMEM; | |
3199 | } else { | |
3200 | ret = LTTNG_ERR_INVALID; | |
3201 | } | |
3202 | goto free_error; | |
3203 | } | |
3204 | ||
6dc3064a DG |
3205 | rcu_read_lock(); |
3206 | snapshot_add_output(&session->snapshot, new_output); | |
3207 | if (id) { | |
3208 | *id = new_output->id; | |
3209 | } | |
3210 | rcu_read_unlock(); | |
3211 | ||
3212 | return LTTNG_OK; | |
3213 | ||
3214 | free_error: | |
3215 | snapshot_output_destroy(new_output); | |
3216 | error: | |
3217 | return ret; | |
3218 | } | |
3219 | ||
3220 | /* | |
3221 | * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl. | |
3222 | * | |
3223 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3224 | */ | |
3225 | int cmd_snapshot_del_output(struct ltt_session *session, | |
3226 | struct lttng_snapshot_output *output) | |
3227 | { | |
3228 | int ret; | |
eb240553 | 3229 | struct snapshot_output *sout = NULL; |
6dc3064a DG |
3230 | |
3231 | assert(session); | |
3232 | assert(output); | |
3233 | ||
6dc3064a DG |
3234 | rcu_read_lock(); |
3235 | ||
3236 | /* | |
d3f14b8a MD |
3237 | * Permission denied to create an output if the session is not |
3238 | * set in no output mode. | |
6dc3064a DG |
3239 | */ |
3240 | if (session->output_traces) { | |
903ef685 | 3241 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3242 | goto error; |
3243 | } | |
3244 | ||
eb240553 DG |
3245 | if (output->id) { |
3246 | DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id, | |
3247 | session->name); | |
3248 | sout = snapshot_find_output_by_id(output->id, &session->snapshot); | |
3249 | } else if (*output->name != '\0') { | |
3250 | DBG("Cmd snapshot del output name %s for session %s", output->name, | |
3251 | session->name); | |
3252 | sout = snapshot_find_output_by_name(output->name, &session->snapshot); | |
3253 | } | |
6dc3064a DG |
3254 | if (!sout) { |
3255 | ret = LTTNG_ERR_INVALID; | |
3256 | goto error; | |
3257 | } | |
3258 | ||
3259 | snapshot_delete_output(&session->snapshot, sout); | |
3260 | snapshot_output_destroy(sout); | |
3261 | ret = LTTNG_OK; | |
3262 | ||
3263 | error: | |
3264 | rcu_read_unlock(); | |
3265 | return ret; | |
3266 | } | |
3267 | ||
3268 | /* | |
3269 | * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl. | |
3270 | * | |
3271 | * If no output is available, outputs is untouched and 0 is returned. | |
3272 | * | |
3273 | * Return the size of the newly allocated outputs or a negative LTTNG_ERR code. | |
3274 | */ | |
3275 | ssize_t cmd_snapshot_list_outputs(struct ltt_session *session, | |
3276 | struct lttng_snapshot_output **outputs) | |
3277 | { | |
3278 | int ret, idx = 0; | |
b223ca94 | 3279 | struct lttng_snapshot_output *list = NULL; |
6dc3064a DG |
3280 | struct lttng_ht_iter iter; |
3281 | struct snapshot_output *output; | |
3282 | ||
3283 | assert(session); | |
3284 | assert(outputs); | |
3285 | ||
3286 | DBG("Cmd snapshot list outputs for session %s", session->name); | |
3287 | ||
3288 | /* | |
d3f14b8a MD |
3289 | * Permission denied to create an output if the session is not |
3290 | * set in no output mode. | |
6dc3064a DG |
3291 | */ |
3292 | if (session->output_traces) { | |
903ef685 JG |
3293 | ret = -LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
3294 | goto end; | |
6dc3064a DG |
3295 | } |
3296 | ||
3297 | if (session->snapshot.nb_output == 0) { | |
3298 | ret = 0; | |
903ef685 | 3299 | goto end; |
6dc3064a DG |
3300 | } |
3301 | ||
3302 | list = zmalloc(session->snapshot.nb_output * sizeof(*list)); | |
3303 | if (!list) { | |
b223ca94 | 3304 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3305 | goto end; |
6dc3064a DG |
3306 | } |
3307 | ||
3308 | /* Copy list from session to the new list object. */ | |
b223ca94 | 3309 | rcu_read_lock(); |
6dc3064a DG |
3310 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter, |
3311 | output, node.node) { | |
3312 | assert(output->consumer); | |
3313 | list[idx].id = output->id; | |
3314 | list[idx].max_size = output->max_size; | |
6ce22875 MD |
3315 | if (lttng_strncpy(list[idx].name, output->name, |
3316 | sizeof(list[idx].name))) { | |
3317 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 3318 | goto error; |
6ce22875 | 3319 | } |
6dc3064a | 3320 | if (output->consumer->type == CONSUMER_DST_LOCAL) { |
6ce22875 MD |
3321 | if (lttng_strncpy(list[idx].ctrl_url, |
3322 | output->consumer->dst.trace_path, | |
3323 | sizeof(list[idx].ctrl_url))) { | |
3324 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 3325 | goto error; |
6ce22875 | 3326 | } |
6dc3064a DG |
3327 | } else { |
3328 | /* Control URI. */ | |
3329 | ret = uri_to_str_url(&output->consumer->dst.net.control, | |
3330 | list[idx].ctrl_url, sizeof(list[idx].ctrl_url)); | |
3331 | if (ret < 0) { | |
b223ca94 | 3332 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3333 | goto error; |
6dc3064a DG |
3334 | } |
3335 | ||
3336 | /* Data URI. */ | |
3337 | ret = uri_to_str_url(&output->consumer->dst.net.data, | |
3338 | list[idx].data_url, sizeof(list[idx].data_url)); | |
3339 | if (ret < 0) { | |
b223ca94 | 3340 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3341 | goto error; |
6dc3064a DG |
3342 | } |
3343 | } | |
3344 | idx++; | |
3345 | } | |
3346 | ||
3347 | *outputs = list; | |
b223ca94 JG |
3348 | list = NULL; |
3349 | ret = session->snapshot.nb_output; | |
6dc3064a | 3350 | error: |
903ef685 | 3351 | rcu_read_unlock(); |
b223ca94 | 3352 | free(list); |
903ef685 | 3353 | end: |
b223ca94 | 3354 | return ret; |
6dc3064a DG |
3355 | } |
3356 | ||
93ec662e JD |
3357 | /* |
3358 | * Check if we can regenerate the metadata for this session. | |
3359 | * Only kernel, UST per-uid and non-live sessions are supported. | |
3360 | * | |
3361 | * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise. | |
3362 | */ | |
3363 | static | |
eded6438 | 3364 | int check_regenerate_metadata_support(struct ltt_session *session) |
93ec662e JD |
3365 | { |
3366 | int ret; | |
3367 | ||
3368 | assert(session); | |
3369 | ||
3370 | if (session->live_timer != 0) { | |
3371 | ret = LTTNG_ERR_LIVE_SESSION; | |
3372 | goto end; | |
3373 | } | |
3374 | if (!session->active) { | |
3375 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
3376 | goto end; | |
3377 | } | |
3378 | if (session->ust_session) { | |
3379 | switch (session->ust_session->buffer_type) { | |
3380 | case LTTNG_BUFFER_PER_UID: | |
3381 | break; | |
3382 | case LTTNG_BUFFER_PER_PID: | |
3383 | ret = LTTNG_ERR_PER_PID_SESSION; | |
3384 | goto end; | |
3385 | default: | |
3386 | assert(0); | |
3387 | ret = LTTNG_ERR_UNK; | |
3388 | goto end; | |
3389 | } | |
3390 | } | |
3391 | if (session->consumer->type == CONSUMER_DST_NET && | |
3392 | session->consumer->relay_minor_version < 8) { | |
3393 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; | |
3394 | goto end; | |
3395 | } | |
3396 | ret = 0; | |
3397 | ||
3398 | end: | |
3399 | return ret; | |
3400 | } | |
3401 | ||
7802bae3 LL |
3402 | static |
3403 | int clear_metadata_file(int fd) | |
3404 | { | |
3405 | int ret; | |
3406 | ||
3407 | ret = lseek(fd, 0, SEEK_SET); | |
3408 | if (ret < 0) { | |
3409 | PERROR("lseek"); | |
3410 | goto end; | |
3411 | } | |
3412 | ||
3413 | ret = ftruncate(fd, 0); | |
3414 | if (ret < 0) { | |
3415 | PERROR("ftruncate"); | |
3416 | goto end; | |
3417 | } | |
3418 | ||
3419 | end: | |
3420 | return ret; | |
3421 | } | |
3422 | ||
93ec662e | 3423 | static |
eded6438 | 3424 | int ust_regenerate_metadata(struct ltt_ust_session *usess) |
93ec662e JD |
3425 | { |
3426 | int ret = 0; | |
3427 | struct buffer_reg_uid *uid_reg = NULL; | |
3428 | struct buffer_reg_session *session_reg = NULL; | |
3429 | ||
3430 | rcu_read_lock(); | |
3431 | cds_list_for_each_entry(uid_reg, &usess->buffer_reg_uid_list, lnode) { | |
3432 | struct ust_registry_session *registry; | |
3433 | struct ust_registry_channel *chan; | |
3434 | struct lttng_ht_iter iter_chan; | |
3435 | ||
3436 | session_reg = uid_reg->registry; | |
3437 | registry = session_reg->reg.ust; | |
3438 | ||
3439 | pthread_mutex_lock(®istry->lock); | |
3440 | registry->metadata_len_sent = 0; | |
3441 | memset(registry->metadata, 0, registry->metadata_alloc_len); | |
3442 | registry->metadata_len = 0; | |
3443 | registry->metadata_version++; | |
7802bae3 LL |
3444 | if (registry->metadata_fd > 0) { |
3445 | /* Clear the metadata file's content. */ | |
3446 | ret = clear_metadata_file(registry->metadata_fd); | |
3447 | if (ret) { | |
3448 | pthread_mutex_unlock(®istry->lock); | |
3449 | goto end; | |
3450 | } | |
3451 | } | |
3452 | ||
93ec662e JD |
3453 | ret = ust_metadata_session_statedump(registry, NULL, |
3454 | registry->major, registry->minor); | |
3455 | if (ret) { | |
3456 | pthread_mutex_unlock(®istry->lock); | |
3457 | ERR("Failed to generate session metadata (err = %d)", | |
3458 | ret); | |
3459 | goto end; | |
3460 | } | |
3461 | cds_lfht_for_each_entry(registry->channels->ht, &iter_chan.iter, | |
3462 | chan, node.node) { | |
3463 | struct ust_registry_event *event; | |
3464 | struct lttng_ht_iter iter_event; | |
3465 | ||
3466 | ret = ust_metadata_channel_statedump(registry, chan); | |
3467 | if (ret) { | |
3468 | pthread_mutex_unlock(®istry->lock); | |
3469 | ERR("Failed to generate channel metadata " | |
3470 | "(err = %d)", ret); | |
3471 | goto end; | |
3472 | } | |
3473 | cds_lfht_for_each_entry(chan->ht->ht, &iter_event.iter, | |
3474 | event, node.node) { | |
3475 | ret = ust_metadata_event_statedump(registry, | |
3476 | chan, event); | |
3477 | if (ret) { | |
3478 | pthread_mutex_unlock(®istry->lock); | |
3479 | ERR("Failed to generate event metadata " | |
3480 | "(err = %d)", ret); | |
3481 | goto end; | |
3482 | } | |
3483 | } | |
3484 | } | |
3485 | pthread_mutex_unlock(®istry->lock); | |
3486 | } | |
3487 | ||
3488 | end: | |
3489 | rcu_read_unlock(); | |
3490 | return ret; | |
3491 | } | |
3492 | ||
3493 | /* | |
eded6438 | 3494 | * Command LTTNG_REGENERATE_METADATA from the lttng-ctl library. |
93ec662e JD |
3495 | * |
3496 | * Ask the consumer to truncate the existing metadata file(s) and | |
3497 | * then regenerate the metadata. Live and per-pid sessions are not | |
3498 | * supported and return an error. | |
3499 | * | |
3500 | * Return 0 on success or else a LTTNG_ERR code. | |
3501 | */ | |
eded6438 | 3502 | int cmd_regenerate_metadata(struct ltt_session *session) |
93ec662e JD |
3503 | { |
3504 | int ret; | |
3505 | ||
3506 | assert(session); | |
3507 | ||
eded6438 | 3508 | ret = check_regenerate_metadata_support(session); |
93ec662e JD |
3509 | if (ret) { |
3510 | goto end; | |
3511 | } | |
3512 | ||
3513 | if (session->kernel_session) { | |
eded6438 | 3514 | ret = kernctl_session_regenerate_metadata( |
93ec662e JD |
3515 | session->kernel_session->fd); |
3516 | if (ret < 0) { | |
3517 | ERR("Failed to regenerate the kernel metadata"); | |
3518 | goto end; | |
3519 | } | |
3520 | } | |
3521 | ||
3522 | if (session->ust_session) { | |
eded6438 | 3523 | ret = ust_regenerate_metadata(session->ust_session); |
93ec662e JD |
3524 | if (ret < 0) { |
3525 | ERR("Failed to regenerate the UST metadata"); | |
3526 | goto end; | |
3527 | } | |
3528 | } | |
3529 | DBG("Cmd metadata regenerate for session %s", session->name); | |
3530 | ret = LTTNG_OK; | |
3531 | ||
3532 | end: | |
3533 | return ret; | |
3534 | } | |
3535 | ||
c2561365 JD |
3536 | /* |
3537 | * Command LTTNG_REGENERATE_STATEDUMP from the lttng-ctl library. | |
3538 | * | |
3539 | * Ask the tracer to regenerate a new statedump. | |
3540 | * | |
3541 | * Return 0 on success or else a LTTNG_ERR code. | |
3542 | */ | |
3543 | int cmd_regenerate_statedump(struct ltt_session *session) | |
3544 | { | |
3545 | int ret; | |
3546 | ||
3547 | assert(session); | |
3548 | ||
3549 | if (!session->active) { | |
3550 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
3551 | goto end; | |
3552 | } | |
3553 | ret = 0; | |
3554 | ||
3555 | if (session->kernel_session) { | |
3556 | ret = kernctl_session_regenerate_statedump( | |
3557 | session->kernel_session->fd); | |
3558 | /* | |
3559 | * Currently, the statedump in kernel can only fail if out | |
3560 | * of memory. | |
3561 | */ | |
3562 | if (ret < 0) { | |
3563 | if (ret == -ENOMEM) { | |
3564 | ret = LTTNG_ERR_REGEN_STATEDUMP_NOMEM; | |
3565 | } else { | |
3566 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
3567 | } | |
3568 | ERR("Failed to regenerate the kernel statedump"); | |
3569 | goto end; | |
3570 | } | |
3571 | } | |
3572 | ||
3573 | if (session->ust_session) { | |
3574 | ret = ust_app_regenerate_statedump_all(session->ust_session); | |
3575 | /* | |
3576 | * Currently, the statedump in UST always returns 0. | |
3577 | */ | |
3578 | if (ret < 0) { | |
3579 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
3580 | ERR("Failed to regenerate the UST statedump"); | |
3581 | goto end; | |
3582 | } | |
3583 | } | |
3584 | DBG("Cmd regenerate statedump for session %s", session->name); | |
3585 | ret = LTTNG_OK; | |
3586 | ||
3587 | end: | |
3588 | return ret; | |
3589 | } | |
3590 | ||
b0880ae5 JG |
3591 | int cmd_register_trigger(struct command_ctx *cmd_ctx, int sock, |
3592 | struct notification_thread_handle *notification_thread) | |
3593 | { | |
3594 | int ret; | |
3595 | size_t trigger_len; | |
3596 | ssize_t sock_recv_len; | |
3597 | struct lttng_trigger *trigger = NULL; | |
3598 | struct lttng_buffer_view view; | |
3599 | struct lttng_dynamic_buffer trigger_buffer; | |
3600 | ||
3601 | lttng_dynamic_buffer_init(&trigger_buffer); | |
3602 | trigger_len = (size_t) cmd_ctx->lsm->u.trigger.length; | |
3603 | ret = lttng_dynamic_buffer_set_size(&trigger_buffer, trigger_len); | |
3604 | if (ret) { | |
3605 | ret = LTTNG_ERR_NOMEM; | |
3606 | goto end; | |
3607 | } | |
3608 | ||
3609 | sock_recv_len = lttcomm_recv_unix_sock(sock, trigger_buffer.data, | |
3610 | trigger_len); | |
3611 | if (sock_recv_len < 0 || sock_recv_len != trigger_len) { | |
3612 | ERR("Failed to receive \"register trigger\" command payload"); | |
3613 | /* TODO: should this be a new error enum ? */ | |
3614 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
3615 | goto end; | |
3616 | } | |
3617 | ||
3618 | view = lttng_buffer_view_from_dynamic_buffer(&trigger_buffer, 0, -1); | |
3619 | if (lttng_trigger_create_from_buffer(&view, &trigger) != | |
3620 | trigger_len) { | |
3621 | ERR("Invalid trigger payload received in \"register trigger\" command"); | |
3622 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
3623 | goto end; | |
3624 | } | |
3625 | ||
3626 | ret = notification_thread_command_register_trigger(notification_thread, | |
3627 | trigger); | |
090c2982 JG |
3628 | /* Ownership of trigger was transferred. */ |
3629 | trigger = NULL; | |
b0880ae5 | 3630 | end: |
090c2982 | 3631 | lttng_trigger_destroy(trigger); |
b0880ae5 JG |
3632 | lttng_dynamic_buffer_reset(&trigger_buffer); |
3633 | return ret; | |
3634 | } | |
3635 | ||
3636 | int cmd_unregister_trigger(struct command_ctx *cmd_ctx, int sock, | |
3637 | struct notification_thread_handle *notification_thread) | |
3638 | { | |
3639 | int ret; | |
3640 | size_t trigger_len; | |
3641 | ssize_t sock_recv_len; | |
3642 | struct lttng_trigger *trigger = NULL; | |
3643 | struct lttng_buffer_view view; | |
3644 | struct lttng_dynamic_buffer trigger_buffer; | |
3645 | ||
3646 | lttng_dynamic_buffer_init(&trigger_buffer); | |
3647 | trigger_len = (size_t) cmd_ctx->lsm->u.trigger.length; | |
3648 | ret = lttng_dynamic_buffer_set_size(&trigger_buffer, trigger_len); | |
3649 | if (ret) { | |
3650 | ret = LTTNG_ERR_NOMEM; | |
3651 | goto end; | |
3652 | } | |
3653 | ||
3654 | sock_recv_len = lttcomm_recv_unix_sock(sock, trigger_buffer.data, | |
3655 | trigger_len); | |
3656 | if (sock_recv_len < 0 || sock_recv_len != trigger_len) { | |
3657 | ERR("Failed to receive \"unregister trigger\" command payload"); | |
3658 | /* TODO: should this be a new error enum ? */ | |
3659 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
3660 | goto end; | |
3661 | } | |
3662 | ||
3663 | view = lttng_buffer_view_from_dynamic_buffer(&trigger_buffer, 0, -1); | |
3664 | if (lttng_trigger_create_from_buffer(&view, &trigger) != | |
3665 | trigger_len) { | |
3666 | ERR("Invalid trigger payload received in \"unregister trigger\" command"); | |
3667 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
3668 | goto end; | |
3669 | } | |
3670 | ||
3671 | ret = notification_thread_command_unregister_trigger(notification_thread, | |
3672 | trigger); | |
3673 | end: | |
090c2982 | 3674 | lttng_trigger_destroy(trigger); |
b0880ae5 JG |
3675 | lttng_dynamic_buffer_reset(&trigger_buffer); |
3676 | return ret; | |
3677 | } | |
3678 | ||
6dc3064a DG |
3679 | /* |
3680 | * Send relayd sockets from snapshot output to consumer. Ignore request if the | |
3681 | * snapshot output is *not* set with a remote destination. | |
3682 | * | |
a934f4af | 3683 | * Return 0 on success or a LTTNG_ERR code. |
6dc3064a DG |
3684 | */ |
3685 | static int set_relayd_for_snapshot(struct consumer_output *consumer, | |
3686 | struct snapshot_output *snap_output, struct ltt_session *session) | |
3687 | { | |
a934f4af | 3688 | int ret = LTTNG_OK; |
6dc3064a DG |
3689 | struct lttng_ht_iter iter; |
3690 | struct consumer_socket *socket; | |
3691 | ||
3692 | assert(consumer); | |
3693 | assert(snap_output); | |
3694 | assert(session); | |
3695 | ||
3696 | DBG2("Set relayd object from snapshot output"); | |
3697 | ||
3698 | /* Ignore if snapshot consumer output is not network. */ | |
3699 | if (snap_output->consumer->type != CONSUMER_DST_NET) { | |
3700 | goto error; | |
3701 | } | |
3702 | ||
3703 | /* | |
3704 | * For each consumer socket, create and send the relayd object of the | |
3705 | * snapshot output. | |
3706 | */ | |
3707 | rcu_read_lock(); | |
5eecee74 DG |
3708 | cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter, |
3709 | socket, node.node) { | |
6dc3064a | 3710 | ret = send_consumer_relayd_sockets(0, session->id, |
d3e2ba59 JD |
3711 | snap_output->consumer, socket, |
3712 | session->name, session->hostname, | |
3713 | session->live_timer); | |
a934f4af | 3714 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3715 | rcu_read_unlock(); |
3716 | goto error; | |
3717 | } | |
3718 | } | |
3719 | rcu_read_unlock(); | |
3720 | ||
3721 | error: | |
3722 | return ret; | |
3723 | } | |
3724 | ||
3725 | /* | |
3726 | * Record a kernel snapshot. | |
3727 | * | |
fac41e72 | 3728 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a DG |
3729 | */ |
3730 | static int record_kernel_snapshot(struct ltt_kernel_session *ksess, | |
5c786ded | 3731 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3732 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3733 | { |
3734 | int ret; | |
3735 | ||
3736 | assert(ksess); | |
3737 | assert(output); | |
3738 | assert(session); | |
3739 | ||
10a50311 | 3740 | |
af706bb7 DG |
3741 | /* |
3742 | * Copy kernel session sockets so we can communicate with the right | |
3743 | * consumer for the snapshot record command. | |
3744 | */ | |
3745 | ret = consumer_copy_sockets(output->consumer, ksess->consumer); | |
3746 | if (ret < 0) { | |
a934f4af | 3747 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3748 | goto error; |
6dc3064a DG |
3749 | } |
3750 | ||
3751 | ret = set_relayd_for_snapshot(ksess->consumer, output, session); | |
a934f4af | 3752 | if (ret != LTTNG_OK) { |
af706bb7 | 3753 | goto error_snapshot; |
6dc3064a DG |
3754 | } |
3755 | ||
d07ceecd | 3756 | ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream); |
2a06df8d | 3757 | if (ret != LTTNG_OK) { |
af706bb7 | 3758 | goto error_snapshot; |
6dc3064a DG |
3759 | } |
3760 | ||
a934f4af | 3761 | ret = LTTNG_OK; |
1371fc12 | 3762 | goto end; |
a934f4af | 3763 | |
af706bb7 DG |
3764 | error_snapshot: |
3765 | /* Clean up copied sockets so this output can use some other later on. */ | |
3766 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a | 3767 | error: |
1371fc12 | 3768 | end: |
6dc3064a DG |
3769 | return ret; |
3770 | } | |
3771 | ||
3772 | /* | |
3773 | * Record a UST snapshot. | |
3774 | * | |
a934f4af | 3775 | * Return 0 on success or a LTTNG_ERR error code. |
6dc3064a DG |
3776 | */ |
3777 | static int record_ust_snapshot(struct ltt_ust_session *usess, | |
5c786ded | 3778 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3779 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3780 | { |
3781 | int ret; | |
3782 | ||
3783 | assert(usess); | |
3784 | assert(output); | |
3785 | assert(session); | |
3786 | ||
af706bb7 | 3787 | /* |
d3f14b8a | 3788 | * Copy UST session sockets so we can communicate with the right |
af706bb7 DG |
3789 | * consumer for the snapshot record command. |
3790 | */ | |
3791 | ret = consumer_copy_sockets(output->consumer, usess->consumer); | |
3792 | if (ret < 0) { | |
a934f4af | 3793 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3794 | goto error; |
6dc3064a DG |
3795 | } |
3796 | ||
3797 | ret = set_relayd_for_snapshot(usess->consumer, output, session); | |
a934f4af | 3798 | if (ret != LTTNG_OK) { |
af706bb7 | 3799 | goto error_snapshot; |
6dc3064a DG |
3800 | } |
3801 | ||
d07ceecd | 3802 | ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream); |
6dc3064a | 3803 | if (ret < 0) { |
7badf927 DG |
3804 | switch (-ret) { |
3805 | case EINVAL: | |
a934f4af | 3806 | ret = LTTNG_ERR_INVALID; |
7badf927 | 3807 | break; |
7badf927 DG |
3808 | default: |
3809 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
3810 | break; | |
5c786ded | 3811 | } |
af706bb7 | 3812 | goto error_snapshot; |
6dc3064a DG |
3813 | } |
3814 | ||
a934f4af DG |
3815 | ret = LTTNG_OK; |
3816 | ||
af706bb7 DG |
3817 | error_snapshot: |
3818 | /* Clean up copied sockets so this output can use some other later on. */ | |
3819 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a DG |
3820 | error: |
3821 | return ret; | |
3822 | } | |
3823 | ||
d07ceecd MD |
3824 | static |
3825 | uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session, | |
3826 | uint64_t cur_nr_packets) | |
68808f4e | 3827 | { |
d07ceecd | 3828 | uint64_t tot_size = 0; |
68808f4e DG |
3829 | |
3830 | if (session->kernel_session) { | |
3831 | struct ltt_kernel_channel *chan; | |
3832 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3833 | ||
68808f4e | 3834 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
d07ceecd MD |
3835 | if (cur_nr_packets >= chan->channel->attr.num_subbuf) { |
3836 | /* | |
3837 | * Don't take channel into account if we | |
3838 | * already grab all its packets. | |
3839 | */ | |
3840 | continue; | |
68808f4e | 3841 | } |
d07ceecd MD |
3842 | tot_size += chan->channel->attr.subbuf_size |
3843 | * chan->stream_count; | |
68808f4e DG |
3844 | } |
3845 | } | |
3846 | ||
3847 | if (session->ust_session) { | |
68808f4e DG |
3848 | struct ltt_ust_session *usess = session->ust_session; |
3849 | ||
d07ceecd MD |
3850 | tot_size += ust_app_get_size_one_more_packet_per_stream(usess, |
3851 | cur_nr_packets); | |
68808f4e DG |
3852 | } |
3853 | ||
d07ceecd | 3854 | return tot_size; |
68808f4e DG |
3855 | } |
3856 | ||
5c786ded | 3857 | /* |
d07ceecd MD |
3858 | * Calculate the number of packets we can grab from each stream that |
3859 | * fits within the overall snapshot max size. | |
3860 | * | |
3861 | * Returns -1 on error, 0 means infinite number of packets, else > 0 is | |
3862 | * the number of packets per stream. | |
3863 | * | |
3864 | * TODO: this approach is not perfect: we consider the worse case | |
3865 | * (packet filling the sub-buffers) as an upper bound, but we could do | |
3866 | * better if we do this calculation while we actually grab the packet | |
3867 | * content: we would know how much padding we don't actually store into | |
3868 | * the file. | |
3869 | * | |
3870 | * This algorithm is currently bounded by the number of packets per | |
3871 | * stream. | |
3872 | * | |
3873 | * Since we call this algorithm before actually grabbing the data, it's | |
3874 | * an approximation: for instance, applications could appear/disappear | |
3875 | * in between this call and actually grabbing data. | |
5c786ded | 3876 | */ |
d07ceecd MD |
3877 | static |
3878 | int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size) | |
5c786ded | 3879 | { |
d07ceecd MD |
3880 | int64_t size_left; |
3881 | uint64_t cur_nb_packets = 0; | |
5c786ded | 3882 | |
d07ceecd MD |
3883 | if (!max_size) { |
3884 | return 0; /* Infinite */ | |
5c786ded JD |
3885 | } |
3886 | ||
d07ceecd MD |
3887 | size_left = max_size; |
3888 | for (;;) { | |
3889 | uint64_t one_more_packet_tot_size; | |
5c786ded | 3890 | |
d07ceecd MD |
3891 | one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session, |
3892 | cur_nb_packets); | |
3893 | if (!one_more_packet_tot_size) { | |
3894 | /* We are already grabbing all packets. */ | |
3895 | break; | |
3896 | } | |
3897 | size_left -= one_more_packet_tot_size; | |
3898 | if (size_left < 0) { | |
3899 | break; | |
3900 | } | |
3901 | cur_nb_packets++; | |
5c786ded | 3902 | } |
d07ceecd MD |
3903 | if (!cur_nb_packets) { |
3904 | /* Not enough room to grab one packet of each stream, error. */ | |
3905 | return -1; | |
3906 | } | |
3907 | return cur_nb_packets; | |
5c786ded JD |
3908 | } |
3909 | ||
6dc3064a DG |
3910 | /* |
3911 | * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl. | |
3912 | * | |
3913 | * The wait parameter is ignored so this call always wait for the snapshot to | |
3914 | * complete before returning. | |
3915 | * | |
3916 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3917 | */ | |
3918 | int cmd_snapshot_record(struct ltt_session *session, | |
3919 | struct lttng_snapshot_output *output, int wait) | |
3920 | { | |
3921 | int ret = LTTNG_OK; | |
e1986656 DG |
3922 | unsigned int use_tmp_output = 0; |
3923 | struct snapshot_output tmp_output; | |
00e1dfc4 | 3924 | unsigned int snapshot_success = 0; |
10ba83fe | 3925 | char datetime[16]; |
6dc3064a DG |
3926 | |
3927 | assert(session); | |
ba45d9f0 | 3928 | assert(output); |
6dc3064a DG |
3929 | |
3930 | DBG("Cmd snapshot record for session %s", session->name); | |
3931 | ||
10ba83fe JR |
3932 | /* Get the datetime for the snapshot output directory. */ |
3933 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", datetime, | |
3934 | sizeof(datetime)); | |
3935 | if (!ret) { | |
3936 | ret = LTTNG_ERR_INVALID; | |
3937 | goto error; | |
3938 | } | |
3939 | ||
6dc3064a | 3940 | /* |
d3f14b8a MD |
3941 | * Permission denied to create an output if the session is not |
3942 | * set in no output mode. | |
6dc3064a DG |
3943 | */ |
3944 | if (session->output_traces) { | |
903ef685 | 3945 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3946 | goto error; |
3947 | } | |
3948 | ||
3949 | /* The session needs to be started at least once. */ | |
8382cf6f | 3950 | if (!session->has_been_started) { |
6dc3064a DG |
3951 | ret = LTTNG_ERR_START_SESSION_ONCE; |
3952 | goto error; | |
3953 | } | |
3954 | ||
3955 | /* Use temporary output for the session. */ | |
ba45d9f0 | 3956 | if (*output->ctrl_url != '\0') { |
6dc3064a DG |
3957 | ret = snapshot_output_init(output->max_size, output->name, |
3958 | output->ctrl_url, output->data_url, session->consumer, | |
e1986656 | 3959 | &tmp_output, NULL); |
6dc3064a DG |
3960 | if (ret < 0) { |
3961 | if (ret == -ENOMEM) { | |
3962 | ret = LTTNG_ERR_NOMEM; | |
3963 | } else { | |
3964 | ret = LTTNG_ERR_INVALID; | |
3965 | } | |
3966 | goto error; | |
3967 | } | |
1bfe7328 DG |
3968 | /* Use the global session count for the temporary snapshot. */ |
3969 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; | |
10ba83fe JR |
3970 | |
3971 | /* Use the global datetime */ | |
3972 | memcpy(tmp_output.datetime, datetime, sizeof(datetime)); | |
e1986656 | 3973 | use_tmp_output = 1; |
6dc3064a DG |
3974 | } |
3975 | ||
804c90a8 JR |
3976 | if (use_tmp_output) { |
3977 | int64_t nb_packets_per_stream; | |
6dc3064a | 3978 | |
804c90a8 JR |
3979 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, |
3980 | tmp_output.max_size); | |
3981 | if (nb_packets_per_stream < 0) { | |
3982 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
3983 | goto error; | |
3984 | } | |
d07ceecd | 3985 | |
804c90a8 JR |
3986 | if (session->kernel_session) { |
3987 | ret = record_kernel_snapshot(session->kernel_session, | |
3988 | &tmp_output, session, | |
3989 | wait, nb_packets_per_stream); | |
3990 | if (ret != LTTNG_OK) { | |
d07ceecd MD |
3991 | goto error; |
3992 | } | |
804c90a8 JR |
3993 | } |
3994 | ||
3995 | if (session->ust_session) { | |
3996 | ret = record_ust_snapshot(session->ust_session, | |
3997 | &tmp_output, session, | |
d07ceecd | 3998 | wait, nb_packets_per_stream); |
a934f4af | 3999 | if (ret != LTTNG_OK) { |
6dc3064a DG |
4000 | goto error; |
4001 | } | |
804c90a8 | 4002 | } |
e1986656 | 4003 | |
804c90a8 JR |
4004 | snapshot_success = 1; |
4005 | } else { | |
4006 | struct snapshot_output *sout; | |
4007 | struct lttng_ht_iter iter; | |
68808f4e | 4008 | |
804c90a8 JR |
4009 | rcu_read_lock(); |
4010 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
4011 | &iter.iter, sout, node.node) { | |
4012 | int64_t nb_packets_per_stream; | |
e1986656 | 4013 | |
804c90a8 JR |
4014 | /* |
4015 | * Make a local copy of the output and assign the possible | |
4016 | * temporary value given by the caller. | |
4017 | */ | |
4018 | memset(&tmp_output, 0, sizeof(tmp_output)); | |
4019 | memcpy(&tmp_output, sout, sizeof(tmp_output)); | |
1bfe7328 | 4020 | |
804c90a8 JR |
4021 | if (output->max_size != (uint64_t) -1ULL) { |
4022 | tmp_output.max_size = output->max_size; | |
6dc3064a | 4023 | } |
d07ceecd MD |
4024 | |
4025 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
4026 | tmp_output.max_size); | |
4027 | if (nb_packets_per_stream < 0) { | |
4028 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
804c90a8 | 4029 | rcu_read_unlock(); |
d07ceecd MD |
4030 | goto error; |
4031 | } | |
6dc3064a | 4032 | |
804c90a8 JR |
4033 | /* Use temporary name. */ |
4034 | if (*output->name != '\0') { | |
cf3e357d MD |
4035 | if (lttng_strncpy(tmp_output.name, output->name, |
4036 | sizeof(tmp_output.name))) { | |
4037 | ret = LTTNG_ERR_INVALID; | |
4038 | rcu_read_unlock(); | |
4039 | goto error; | |
4040 | } | |
804c90a8 | 4041 | } |
e1986656 | 4042 | |
804c90a8 | 4043 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; |
10ba83fe | 4044 | memcpy(tmp_output.datetime, datetime, sizeof(datetime)); |
e1986656 | 4045 | |
804c90a8 JR |
4046 | if (session->kernel_session) { |
4047 | ret = record_kernel_snapshot(session->kernel_session, | |
4048 | &tmp_output, session, | |
4049 | wait, nb_packets_per_stream); | |
4050 | if (ret != LTTNG_OK) { | |
d07ceecd | 4051 | rcu_read_unlock(); |
68808f4e DG |
4052 | goto error; |
4053 | } | |
804c90a8 | 4054 | } |
68808f4e | 4055 | |
804c90a8 JR |
4056 | if (session->ust_session) { |
4057 | ret = record_ust_snapshot(session->ust_session, | |
4058 | &tmp_output, session, | |
d07ceecd | 4059 | wait, nb_packets_per_stream); |
a934f4af | 4060 | if (ret != LTTNG_OK) { |
6dc3064a DG |
4061 | rcu_read_unlock(); |
4062 | goto error; | |
4063 | } | |
4064 | } | |
804c90a8 | 4065 | snapshot_success = 1; |
6dc3064a | 4066 | } |
804c90a8 | 4067 | rcu_read_unlock(); |
6dc3064a DG |
4068 | } |
4069 | ||
1bfe7328 DG |
4070 | if (snapshot_success) { |
4071 | session->snapshot.nb_snapshot++; | |
b67578cb MD |
4072 | } else { |
4073 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
1bfe7328 DG |
4074 | } |
4075 | ||
6dc3064a | 4076 | error: |
6dc3064a DG |
4077 | return ret; |
4078 | } | |
4079 | ||
d7ba1388 MD |
4080 | /* |
4081 | * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread. | |
4082 | */ | |
4083 | int cmd_set_session_shm_path(struct ltt_session *session, | |
4084 | const char *shm_path) | |
4085 | { | |
4086 | /* Safety net */ | |
4087 | assert(session); | |
4088 | ||
4089 | /* | |
4090 | * Can only set shm path before session is started. | |
4091 | */ | |
4092 | if (session->has_been_started) { | |
4093 | return LTTNG_ERR_SESSION_STARTED; | |
4094 | } | |
4095 | ||
4096 | strncpy(session->shm_path, shm_path, | |
4097 | sizeof(session->shm_path)); | |
4098 | session->shm_path[sizeof(session->shm_path) - 1] = '\0'; | |
4099 | ||
4100 | return 0; | |
4101 | } | |
4102 | ||
2f77fc4b DG |
4103 | /* |
4104 | * Init command subsystem. | |
4105 | */ | |
4106 | void cmd_init(void) | |
4107 | { | |
4108 | /* | |
d88aee68 DG |
4109 | * Set network sequence index to 1 for streams to match a relayd |
4110 | * socket on the consumer side. | |
2f77fc4b | 4111 | */ |
d88aee68 DG |
4112 | pthread_mutex_lock(&relayd_net_seq_idx_lock); |
4113 | relayd_net_seq_idx = 1; | |
4114 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
4115 | |
4116 | DBG("Command subsystem initialized"); | |
4117 | } |