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. | |
1aabd7d3 JG |
910 | * |
911 | * The consumer socket lock must be held by the caller. | |
2f77fc4b | 912 | */ |
56a37563 JG |
913 | static int send_consumer_relayd_socket(enum lttng_domain_type domain, |
914 | unsigned int session_id, struct lttng_uri *relayd_uri, | |
915 | struct consumer_output *consumer, | |
d3e2ba59 JD |
916 | struct consumer_socket *consumer_sock, |
917 | char *session_name, char *hostname, int session_live_timer) | |
2f77fc4b DG |
918 | { |
919 | int ret; | |
6151a90f | 920 | struct lttcomm_relayd_sock *rsock = NULL; |
2f77fc4b | 921 | |
ffe60014 | 922 | /* Connect to relayd and make version check if uri is the control. */ |
b31610f2 | 923 | ret = create_connect_relayd(relayd_uri, &rsock, consumer); |
ffe60014 | 924 | if (ret != LTTNG_OK) { |
53ed4fe7 | 925 | goto relayd_comm_error; |
ffe60014 | 926 | } |
6151a90f | 927 | assert(rsock); |
ffe60014 | 928 | |
2f77fc4b | 929 | /* Set the network sequence index if not set. */ |
d88aee68 DG |
930 | if (consumer->net_seq_index == (uint64_t) -1ULL) { |
931 | pthread_mutex_lock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
932 | /* |
933 | * Increment net_seq_idx because we are about to transfer the | |
934 | * new relayd socket to the consumer. | |
d88aee68 | 935 | * Assign unique key so the consumer can match streams. |
2f77fc4b | 936 | */ |
d88aee68 DG |
937 | consumer->net_seq_index = ++relayd_net_seq_idx; |
938 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
939 | } |
940 | ||
2f77fc4b | 941 | /* Send relayd socket to consumer. */ |
6151a90f | 942 | ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer, |
d3e2ba59 JD |
943 | relayd_uri->stype, session_id, |
944 | session_name, hostname, session_live_timer); | |
2f77fc4b | 945 | if (ret < 0) { |
f73fabfd | 946 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
947 | goto close_sock; |
948 | } | |
949 | ||
c890b720 DG |
950 | /* Flag that the corresponding socket was sent. */ |
951 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
ffe60014 | 952 | consumer_sock->control_sock_sent = 1; |
c890b720 | 953 | } else if (relayd_uri->stype == LTTNG_STREAM_DATA) { |
ffe60014 | 954 | consumer_sock->data_sock_sent = 1; |
c890b720 DG |
955 | } |
956 | ||
f73fabfd | 957 | ret = LTTNG_OK; |
2f77fc4b DG |
958 | |
959 | /* | |
960 | * Close socket which was dup on the consumer side. The session daemon does | |
961 | * NOT keep track of the relayd socket(s) once transfer to the consumer. | |
962 | */ | |
963 | ||
964 | close_sock: | |
ffe60014 DG |
965 | if (ret != LTTNG_OK) { |
966 | /* | |
d9078d0c DG |
967 | * The consumer output for this session should not be used anymore |
968 | * since the relayd connection failed thus making any tracing or/and | |
969 | * streaming not usable. | |
ffe60014 | 970 | */ |
d9078d0c | 971 | consumer->enabled = 0; |
ffe60014 | 972 | } |
53ed4fe7 JR |
973 | (void) relayd_close(rsock); |
974 | free(rsock); | |
975 | ||
976 | relayd_comm_error: | |
2f77fc4b DG |
977 | return ret; |
978 | } | |
979 | ||
980 | /* | |
981 | * Send both relayd sockets to a specific consumer and domain. This is a | |
982 | * helper function to facilitate sending the information to the consumer for a | |
983 | * session. | |
1aabd7d3 JG |
984 | * |
985 | * The consumer socket lock must be held by the caller. | |
2f77fc4b | 986 | */ |
56a37563 JG |
987 | static int send_consumer_relayd_sockets(enum lttng_domain_type domain, |
988 | unsigned int session_id, struct consumer_output *consumer, | |
989 | struct consumer_socket *sock, char *session_name, | |
990 | char *hostname, int session_live_timer) | |
2f77fc4b | 991 | { |
dda67f6c | 992 | int ret = LTTNG_OK; |
2f77fc4b | 993 | |
2f77fc4b | 994 | assert(consumer); |
6dc3064a | 995 | assert(sock); |
2f77fc4b | 996 | |
2f77fc4b | 997 | /* Sending control relayd socket. */ |
ffe60014 | 998 | if (!sock->control_sock_sent) { |
6dc3064a | 999 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
1000 | &consumer->dst.net.control, consumer, sock, |
1001 | session_name, hostname, session_live_timer); | |
c890b720 DG |
1002 | if (ret != LTTNG_OK) { |
1003 | goto error; | |
1004 | } | |
2f77fc4b DG |
1005 | } |
1006 | ||
1007 | /* Sending data relayd socket. */ | |
ffe60014 | 1008 | if (!sock->data_sock_sent) { |
6dc3064a | 1009 | ret = send_consumer_relayd_socket(domain, session_id, |
d3e2ba59 JD |
1010 | &consumer->dst.net.data, consumer, sock, |
1011 | session_name, hostname, session_live_timer); | |
c890b720 DG |
1012 | if (ret != LTTNG_OK) { |
1013 | goto error; | |
1014 | } | |
2f77fc4b DG |
1015 | } |
1016 | ||
2f77fc4b DG |
1017 | error: |
1018 | return ret; | |
1019 | } | |
1020 | ||
1021 | /* | |
1022 | * Setup relayd connections for a tracing session. First creates the socket to | |
1023 | * the relayd and send them to the right domain consumer. Consumer type MUST be | |
1024 | * network. | |
1025 | */ | |
ffe60014 | 1026 | int cmd_setup_relayd(struct ltt_session *session) |
2f77fc4b | 1027 | { |
f73fabfd | 1028 | int ret = LTTNG_OK; |
2f77fc4b DG |
1029 | struct ltt_ust_session *usess; |
1030 | struct ltt_kernel_session *ksess; | |
1031 | struct consumer_socket *socket; | |
1032 | struct lttng_ht_iter iter; | |
1033 | ||
1034 | assert(session); | |
1035 | ||
1036 | usess = session->ust_session; | |
1037 | ksess = session->kernel_session; | |
1038 | ||
785d2d0d | 1039 | DBG("Setting relayd for session %s", session->name); |
2f77fc4b | 1040 | |
e7fe706f DG |
1041 | rcu_read_lock(); |
1042 | ||
2f77fc4b DG |
1043 | if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET |
1044 | && usess->consumer->enabled) { | |
1045 | /* For each consumer socket, send relayd sockets */ | |
1046 | cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, | |
1047 | socket, node.node) { | |
2f77fc4b | 1048 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1049 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id, |
d3e2ba59 JD |
1050 | usess->consumer, socket, |
1051 | session->name, session->hostname, | |
1052 | session->live_timer); | |
2f77fc4b | 1053 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1054 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1055 | goto error; |
1056 | } | |
6dc3064a DG |
1057 | /* Session is now ready for network streaming. */ |
1058 | session->net_handle = 1; | |
2f77fc4b | 1059 | } |
b31610f2 JD |
1060 | session->consumer->relay_major_version = |
1061 | usess->consumer->relay_major_version; | |
1062 | session->consumer->relay_minor_version = | |
1063 | usess->consumer->relay_minor_version; | |
2f77fc4b DG |
1064 | } |
1065 | ||
1066 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET | |
1067 | && ksess->consumer->enabled) { | |
1068 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1069 | socket, node.node) { | |
2f77fc4b | 1070 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1071 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id, |
d3e2ba59 JD |
1072 | ksess->consumer, socket, |
1073 | session->name, session->hostname, | |
1074 | session->live_timer); | |
2f77fc4b | 1075 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1076 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1077 | goto error; |
1078 | } | |
6dc3064a DG |
1079 | /* Session is now ready for network streaming. */ |
1080 | session->net_handle = 1; | |
2f77fc4b | 1081 | } |
b31610f2 JD |
1082 | session->consumer->relay_major_version = |
1083 | ksess->consumer->relay_major_version; | |
1084 | session->consumer->relay_minor_version = | |
1085 | ksess->consumer->relay_minor_version; | |
2f77fc4b DG |
1086 | } |
1087 | ||
1088 | error: | |
e7fe706f | 1089 | rcu_read_unlock(); |
2f77fc4b DG |
1090 | return ret; |
1091 | } | |
1092 | ||
9b6c7ec5 DG |
1093 | /* |
1094 | * Start a kernel session by opening all necessary streams. | |
1095 | */ | |
1096 | static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe) | |
1097 | { | |
1098 | int ret; | |
1099 | struct ltt_kernel_channel *kchan; | |
1100 | ||
1101 | /* Open kernel metadata */ | |
07b86b52 | 1102 | if (ksess->metadata == NULL && ksess->output_traces) { |
9b6c7ec5 DG |
1103 | ret = kernel_open_metadata(ksess); |
1104 | if (ret < 0) { | |
1105 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1106 | goto error; | |
1107 | } | |
1108 | } | |
1109 | ||
1110 | /* Open kernel metadata stream */ | |
07b86b52 | 1111 | if (ksess->metadata && ksess->metadata_stream_fd < 0) { |
9b6c7ec5 DG |
1112 | ret = kernel_open_metadata_stream(ksess); |
1113 | if (ret < 0) { | |
1114 | ERR("Kernel create metadata stream failed"); | |
1115 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1116 | goto error; | |
1117 | } | |
1118 | } | |
1119 | ||
1120 | /* For each channel */ | |
1121 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
1122 | if (kchan->stream_count == 0) { | |
1123 | ret = kernel_open_channel_stream(kchan); | |
1124 | if (ret < 0) { | |
1125 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1126 | goto error; | |
1127 | } | |
1128 | /* Update the stream global counter */ | |
1129 | ksess->stream_count_global += ret; | |
1130 | } | |
1131 | } | |
1132 | ||
1133 | /* Setup kernel consumer socket and send fds to it */ | |
1134 | ret = init_kernel_tracing(ksess); | |
e43c41c5 | 1135 | if (ret != 0) { |
9b6c7ec5 DG |
1136 | ret = LTTNG_ERR_KERN_START_FAIL; |
1137 | goto error; | |
1138 | } | |
1139 | ||
1140 | /* This start the kernel tracing */ | |
1141 | ret = kernel_start_session(ksess); | |
1142 | if (ret < 0) { | |
1143 | ret = LTTNG_ERR_KERN_START_FAIL; | |
1144 | goto error; | |
1145 | } | |
1146 | ||
1147 | /* Quiescent wait after starting trace */ | |
784303b0 | 1148 | kernel_wait_quiescent(kernel_tracer_fd); |
9b6c7ec5 | 1149 | |
14fb1ebe | 1150 | ksess->active = 1; |
9b6c7ec5 DG |
1151 | |
1152 | ret = LTTNG_OK; | |
1153 | ||
1154 | error: | |
1155 | return ret; | |
1156 | } | |
1157 | ||
2f77fc4b DG |
1158 | /* |
1159 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. | |
1160 | */ | |
56a37563 JG |
1161 | int cmd_disable_channel(struct ltt_session *session, |
1162 | enum lttng_domain_type domain, char *channel_name) | |
2f77fc4b DG |
1163 | { |
1164 | int ret; | |
1165 | struct ltt_ust_session *usess; | |
1166 | ||
1167 | usess = session->ust_session; | |
1168 | ||
2223c96f DG |
1169 | rcu_read_lock(); |
1170 | ||
2f77fc4b DG |
1171 | switch (domain) { |
1172 | case LTTNG_DOMAIN_KERNEL: | |
1173 | { | |
1174 | ret = channel_kernel_disable(session->kernel_session, | |
1175 | channel_name); | |
f73fabfd | 1176 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1177 | goto error; |
1178 | } | |
1179 | ||
1180 | kernel_wait_quiescent(kernel_tracer_fd); | |
1181 | break; | |
1182 | } | |
1183 | case LTTNG_DOMAIN_UST: | |
1184 | { | |
1185 | struct ltt_ust_channel *uchan; | |
1186 | struct lttng_ht *chan_ht; | |
1187 | ||
1188 | chan_ht = usess->domain_global.channels; | |
1189 | ||
1190 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
1191 | if (uchan == NULL) { | |
f73fabfd | 1192 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
1193 | goto error; |
1194 | } | |
1195 | ||
7972aab2 | 1196 | ret = channel_ust_disable(usess, uchan); |
f73fabfd | 1197 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1198 | goto error; |
1199 | } | |
1200 | break; | |
1201 | } | |
2f77fc4b | 1202 | default: |
f73fabfd | 1203 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1204 | goto error; |
1205 | } | |
1206 | ||
f73fabfd | 1207 | ret = LTTNG_OK; |
2f77fc4b DG |
1208 | |
1209 | error: | |
2223c96f | 1210 | rcu_read_unlock(); |
2f77fc4b DG |
1211 | return ret; |
1212 | } | |
1213 | ||
ccf10263 MD |
1214 | /* |
1215 | * Command LTTNG_TRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1216 | * |
1217 | * Called with session lock held. | |
ccf10263 | 1218 | */ |
56a37563 JG |
1219 | int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1220 | int pid) | |
ccf10263 MD |
1221 | { |
1222 | int ret; | |
1223 | ||
1224 | rcu_read_lock(); | |
1225 | ||
1226 | switch (domain) { | |
1227 | case LTTNG_DOMAIN_KERNEL: | |
1228 | { | |
1229 | struct ltt_kernel_session *ksess; | |
1230 | ||
1231 | ksess = session->kernel_session; | |
1232 | ||
1233 | ret = kernel_track_pid(ksess, pid); | |
1234 | if (ret != LTTNG_OK) { | |
1235 | goto error; | |
1236 | } | |
1237 | ||
1238 | kernel_wait_quiescent(kernel_tracer_fd); | |
1239 | break; | |
1240 | } | |
ccf10263 | 1241 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1242 | { |
1243 | struct ltt_ust_session *usess; | |
1244 | ||
1245 | usess = session->ust_session; | |
1246 | ||
1247 | ret = trace_ust_track_pid(usess, pid); | |
1248 | if (ret != LTTNG_OK) { | |
1249 | goto error; | |
1250 | } | |
1251 | break; | |
1252 | } | |
ccf10263 MD |
1253 | default: |
1254 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1255 | goto error; | |
1256 | } | |
1257 | ||
1258 | ret = LTTNG_OK; | |
1259 | ||
1260 | error: | |
1261 | rcu_read_unlock(); | |
1262 | return ret; | |
1263 | } | |
1264 | ||
1265 | /* | |
1266 | * Command LTTNG_UNTRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1267 | * |
1268 | * Called with session lock held. | |
ccf10263 | 1269 | */ |
56a37563 JG |
1270 | int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1271 | int pid) | |
ccf10263 MD |
1272 | { |
1273 | int ret; | |
1274 | ||
1275 | rcu_read_lock(); | |
1276 | ||
1277 | switch (domain) { | |
1278 | case LTTNG_DOMAIN_KERNEL: | |
1279 | { | |
1280 | struct ltt_kernel_session *ksess; | |
1281 | ||
1282 | ksess = session->kernel_session; | |
1283 | ||
1284 | ret = kernel_untrack_pid(ksess, pid); | |
1285 | if (ret != LTTNG_OK) { | |
1286 | goto error; | |
1287 | } | |
1288 | ||
1289 | kernel_wait_quiescent(kernel_tracer_fd); | |
1290 | break; | |
1291 | } | |
ccf10263 | 1292 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1293 | { |
1294 | struct ltt_ust_session *usess; | |
1295 | ||
1296 | usess = session->ust_session; | |
1297 | ||
1298 | ret = trace_ust_untrack_pid(usess, pid); | |
1299 | if (ret != LTTNG_OK) { | |
1300 | goto error; | |
1301 | } | |
1302 | break; | |
1303 | } | |
ccf10263 MD |
1304 | default: |
1305 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1306 | goto error; | |
1307 | } | |
1308 | ||
1309 | ret = LTTNG_OK; | |
1310 | ||
1311 | error: | |
1312 | rcu_read_unlock(); | |
1313 | return ret; | |
1314 | } | |
1315 | ||
2f77fc4b DG |
1316 | /* |
1317 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
1318 | * | |
1319 | * The wpipe arguments is used as a notifier for the kernel thread. | |
1320 | */ | |
1321 | int cmd_enable_channel(struct ltt_session *session, | |
7972aab2 | 1322 | struct lttng_domain *domain, struct lttng_channel *attr, int wpipe) |
2f77fc4b DG |
1323 | { |
1324 | int ret; | |
1325 | struct ltt_ust_session *usess = session->ust_session; | |
1326 | struct lttng_ht *chan_ht; | |
1f345e94 | 1327 | size_t len; |
2f77fc4b DG |
1328 | |
1329 | assert(session); | |
1330 | assert(attr); | |
7972aab2 | 1331 | assert(domain); |
2f77fc4b | 1332 | |
f5436bfc | 1333 | len = lttng_strnlen(attr->name, sizeof(attr->name)); |
1f345e94 PP |
1334 | |
1335 | /* Validate channel name */ | |
1336 | if (attr->name[0] == '.' || | |
1337 | memchr(attr->name, '/', len) != NULL) { | |
1338 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1339 | goto end; | |
1340 | } | |
1341 | ||
2f77fc4b DG |
1342 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
1343 | ||
03b4fdcf DG |
1344 | rcu_read_lock(); |
1345 | ||
ecc48a90 JD |
1346 | /* |
1347 | * Don't try to enable a channel if the session has been started at | |
1348 | * some point in time before. The tracer does not allow it. | |
1349 | */ | |
8382cf6f | 1350 | if (session->has_been_started) { |
ecc48a90 JD |
1351 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
1352 | goto error; | |
1353 | } | |
1354 | ||
1355 | /* | |
1356 | * If the session is a live session, remove the switch timer, the | |
1357 | * live timer does the same thing but sends also synchronisation | |
1358 | * beacons for inactive streams. | |
1359 | */ | |
1360 | if (session->live_timer > 0) { | |
1361 | attr->attr.live_timer_interval = session->live_timer; | |
1362 | attr->attr.switch_timer_interval = 0; | |
1363 | } | |
1364 | ||
883d8478 JR |
1365 | /* Check for feature support */ |
1366 | switch (domain->type) { | |
1367 | case LTTNG_DOMAIN_KERNEL: | |
1368 | { | |
1369 | if (kernel_supports_ring_buffer_snapshot_sample_positions(kernel_tracer_fd) != 1) { | |
1370 | /* Sampling position of buffer is not supported */ | |
1371 | WARN("Kernel tracer does not support buffer monitoring. " | |
1372 | "Setting the monitor interval timer to 0 " | |
1373 | "(disabled) for channel '%s' of session '%s'", | |
1374 | attr-> name, session->name); | |
1375 | lttng_channel_set_monitor_timer_interval(attr, 0); | |
1376 | } | |
1377 | break; | |
1378 | } | |
1379 | case LTTNG_DOMAIN_UST: | |
1380 | case LTTNG_DOMAIN_JUL: | |
1381 | case LTTNG_DOMAIN_LOG4J: | |
1382 | case LTTNG_DOMAIN_PYTHON: | |
1383 | break; | |
1384 | default: | |
1385 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1386 | goto error; | |
1387 | } | |
1388 | ||
7972aab2 | 1389 | switch (domain->type) { |
2f77fc4b DG |
1390 | case LTTNG_DOMAIN_KERNEL: |
1391 | { | |
1392 | struct ltt_kernel_channel *kchan; | |
1393 | ||
2f77fc4b DG |
1394 | kchan = trace_kernel_get_channel_by_name(attr->name, |
1395 | session->kernel_session); | |
1396 | if (kchan == NULL) { | |
1397 | ret = channel_kernel_create(session->kernel_session, attr, wpipe); | |
85076754 MD |
1398 | if (attr->name[0] != '\0') { |
1399 | session->kernel_session->has_non_default_channel = 1; | |
1400 | } | |
2f77fc4b DG |
1401 | } else { |
1402 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
1403 | } | |
1404 | ||
f73fabfd | 1405 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1406 | goto error; |
1407 | } | |
1408 | ||
784303b0 | 1409 | kernel_wait_quiescent(kernel_tracer_fd); |
2f77fc4b DG |
1410 | break; |
1411 | } | |
1412 | case LTTNG_DOMAIN_UST: | |
9232818f JG |
1413 | case LTTNG_DOMAIN_JUL: |
1414 | case LTTNG_DOMAIN_LOG4J: | |
1415 | case LTTNG_DOMAIN_PYTHON: | |
2f77fc4b DG |
1416 | { |
1417 | struct ltt_ust_channel *uchan; | |
1418 | ||
9232818f JG |
1419 | /* |
1420 | * FIXME | |
1421 | * | |
1422 | * Current agent implementation limitations force us to allow | |
1423 | * only one channel at once in "agent" subdomains. Each | |
1424 | * subdomain has a default channel name which must be strictly | |
1425 | * adhered to. | |
1426 | */ | |
1427 | if (domain->type == LTTNG_DOMAIN_JUL) { | |
1428 | if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME, | |
1429 | LTTNG_SYMBOL_NAME_LEN)) { | |
1430 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1431 | goto error; | |
1432 | } | |
1433 | } else if (domain->type == LTTNG_DOMAIN_LOG4J) { | |
1434 | if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME, | |
1435 | LTTNG_SYMBOL_NAME_LEN)) { | |
1436 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1437 | goto error; | |
1438 | } | |
1439 | } else if (domain->type == LTTNG_DOMAIN_PYTHON) { | |
1440 | if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME, | |
1441 | LTTNG_SYMBOL_NAME_LEN)) { | |
1442 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1443 | goto error; | |
1444 | } | |
1445 | } | |
1446 | ||
2f77fc4b DG |
1447 | chan_ht = usess->domain_global.channels; |
1448 | ||
1449 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); | |
1450 | if (uchan == NULL) { | |
7972aab2 | 1451 | ret = channel_ust_create(usess, attr, domain->buf_type); |
85076754 MD |
1452 | if (attr->name[0] != '\0') { |
1453 | usess->has_non_default_channel = 1; | |
1454 | } | |
2f77fc4b | 1455 | } else { |
7972aab2 | 1456 | ret = channel_ust_enable(usess, uchan); |
2f77fc4b DG |
1457 | } |
1458 | break; | |
1459 | } | |
2f77fc4b | 1460 | default: |
f73fabfd | 1461 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1462 | goto error; |
1463 | } | |
1464 | ||
1465 | error: | |
2223c96f | 1466 | rcu_read_unlock(); |
1f345e94 | 1467 | end: |
2f77fc4b DG |
1468 | return ret; |
1469 | } | |
1470 | ||
2f77fc4b DG |
1471 | /* |
1472 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1473 | */ | |
56a37563 JG |
1474 | int cmd_disable_event(struct ltt_session *session, |
1475 | enum lttng_domain_type domain, char *channel_name, | |
6e911cad | 1476 | struct lttng_event *event) |
2f77fc4b DG |
1477 | { |
1478 | int ret; | |
6e911cad MD |
1479 | char *event_name; |
1480 | ||
18a720cd MD |
1481 | DBG("Disable event command for event \'%s\'", event->name); |
1482 | ||
6e911cad MD |
1483 | event_name = event->name; |
1484 | ||
9b7431cf JG |
1485 | /* Error out on unhandled search criteria */ |
1486 | if (event->loglevel_type || event->loglevel != -1 || event->enabled | |
6e911cad | 1487 | || event->pid || event->filter || event->exclusion) { |
7076b56e JG |
1488 | ret = LTTNG_ERR_UNK; |
1489 | goto error; | |
6e911cad | 1490 | } |
2f77fc4b | 1491 | |
2223c96f DG |
1492 | rcu_read_lock(); |
1493 | ||
2f77fc4b DG |
1494 | switch (domain) { |
1495 | case LTTNG_DOMAIN_KERNEL: | |
1496 | { | |
1497 | struct ltt_kernel_channel *kchan; | |
1498 | struct ltt_kernel_session *ksess; | |
1499 | ||
1500 | ksess = session->kernel_session; | |
1501 | ||
85076754 MD |
1502 | /* |
1503 | * If a non-default channel has been created in the | |
1504 | * session, explicitely require that -c chan_name needs | |
1505 | * to be provided. | |
1506 | */ | |
1507 | if (ksess->has_non_default_channel && channel_name[0] == '\0') { | |
1508 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1509 | goto error_unlock; |
85076754 MD |
1510 | } |
1511 | ||
2f77fc4b DG |
1512 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
1513 | if (kchan == NULL) { | |
f73fabfd | 1514 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
7076b56e | 1515 | goto error_unlock; |
2f77fc4b DG |
1516 | } |
1517 | ||
6e911cad MD |
1518 | switch (event->type) { |
1519 | case LTTNG_EVENT_ALL: | |
9550ee81 | 1520 | case LTTNG_EVENT_TRACEPOINT: |
d0ae4ea8 | 1521 | case LTTNG_EVENT_SYSCALL: |
9550ee81 JR |
1522 | case LTTNG_EVENT_PROBE: |
1523 | case LTTNG_EVENT_FUNCTION: | |
1524 | case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */ | |
1525 | if (event_name[0] == '\0') { | |
1526 | ret = event_kernel_disable_event(kchan, | |
1527 | NULL, event->type); | |
29c62722 | 1528 | } else { |
d0ae4ea8 | 1529 | ret = event_kernel_disable_event(kchan, |
9550ee81 | 1530 | event_name, event->type); |
29c62722 | 1531 | } |
6e911cad | 1532 | if (ret != LTTNG_OK) { |
7076b56e | 1533 | goto error_unlock; |
6e911cad MD |
1534 | } |
1535 | break; | |
6e911cad MD |
1536 | default: |
1537 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1538 | goto error_unlock; |
2f77fc4b DG |
1539 | } |
1540 | ||
1541 | kernel_wait_quiescent(kernel_tracer_fd); | |
1542 | break; | |
1543 | } | |
1544 | case LTTNG_DOMAIN_UST: | |
1545 | { | |
1546 | struct ltt_ust_channel *uchan; | |
1547 | struct ltt_ust_session *usess; | |
1548 | ||
1549 | usess = session->ust_session; | |
1550 | ||
7076b56e JG |
1551 | if (validate_ust_event_name(event_name)) { |
1552 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1553 | goto error_unlock; | |
1554 | } | |
1555 | ||
85076754 MD |
1556 | /* |
1557 | * If a non-default channel has been created in the | |
9550ee81 | 1558 | * session, explicitly require that -c chan_name needs |
85076754 MD |
1559 | * to be provided. |
1560 | */ | |
1561 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1562 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1563 | goto error_unlock; |
85076754 MD |
1564 | } |
1565 | ||
2f77fc4b DG |
1566 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
1567 | channel_name); | |
1568 | if (uchan == NULL) { | |
f73fabfd | 1569 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
7076b56e | 1570 | goto error_unlock; |
2f77fc4b DG |
1571 | } |
1572 | ||
6e911cad MD |
1573 | switch (event->type) { |
1574 | case LTTNG_EVENT_ALL: | |
b3639870 JR |
1575 | /* |
1576 | * An empty event name means that everything | |
1577 | * should be disabled. | |
1578 | */ | |
1579 | if (event->name[0] == '\0') { | |
1580 | ret = event_ust_disable_all_tracepoints(usess, uchan); | |
77d536b2 JR |
1581 | } else { |
1582 | ret = event_ust_disable_tracepoint(usess, uchan, | |
1583 | event_name); | |
1584 | } | |
6e911cad | 1585 | if (ret != LTTNG_OK) { |
7076b56e | 1586 | goto error_unlock; |
6e911cad MD |
1587 | } |
1588 | break; | |
1589 | default: | |
1590 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1591 | goto error_unlock; |
2f77fc4b DG |
1592 | } |
1593 | ||
1594 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
1595 | channel_name); | |
1596 | break; | |
1597 | } | |
5cdb6027 | 1598 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1599 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1600 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1601 | { |
fefd409b | 1602 | struct agent *agt; |
f20baf8e DG |
1603 | struct ltt_ust_session *usess = session->ust_session; |
1604 | ||
1605 | assert(usess); | |
1606 | ||
6e911cad MD |
1607 | switch (event->type) { |
1608 | case LTTNG_EVENT_ALL: | |
1609 | break; | |
1610 | default: | |
1611 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1612 | goto error_unlock; |
6e911cad MD |
1613 | } |
1614 | ||
5cdb6027 | 1615 | agt = trace_ust_find_agent(usess, domain); |
fefd409b DG |
1616 | if (!agt) { |
1617 | ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
7076b56e | 1618 | goto error_unlock; |
fefd409b | 1619 | } |
b3639870 JR |
1620 | /* |
1621 | * An empty event name means that everything | |
1622 | * should be disabled. | |
1623 | */ | |
1624 | if (event->name[0] == '\0') { | |
18a720cd MD |
1625 | ret = event_agent_disable_all(usess, agt); |
1626 | } else { | |
1627 | ret = event_agent_disable(usess, agt, event_name); | |
1628 | } | |
f20baf8e | 1629 | if (ret != LTTNG_OK) { |
7076b56e | 1630 | goto error_unlock; |
f20baf8e DG |
1631 | } |
1632 | ||
1633 | break; | |
1634 | } | |
2f77fc4b | 1635 | default: |
f73fabfd | 1636 | ret = LTTNG_ERR_UND; |
7076b56e | 1637 | goto error_unlock; |
2f77fc4b DG |
1638 | } |
1639 | ||
f73fabfd | 1640 | ret = LTTNG_OK; |
2f77fc4b | 1641 | |
7076b56e | 1642 | error_unlock: |
2223c96f | 1643 | rcu_read_unlock(); |
7076b56e | 1644 | error: |
2f77fc4b DG |
1645 | return ret; |
1646 | } | |
1647 | ||
2f77fc4b DG |
1648 | /* |
1649 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1650 | */ | |
56a37563 | 1651 | int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain, |
601d5acf | 1652 | char *channel_name, struct lttng_event_context *ctx, int kwpipe) |
2f77fc4b | 1653 | { |
d5979e4a | 1654 | int ret, chan_kern_created = 0, chan_ust_created = 0; |
bdf64013 JG |
1655 | char *app_ctx_provider_name = NULL, *app_ctx_name = NULL; |
1656 | ||
1657 | if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
1658 | app_ctx_provider_name = ctx->u.app_ctx.provider_name; | |
1659 | app_ctx_name = ctx->u.app_ctx.ctx_name; | |
1660 | } | |
2f77fc4b DG |
1661 | |
1662 | switch (domain) { | |
1663 | case LTTNG_DOMAIN_KERNEL: | |
979e618e DG |
1664 | assert(session->kernel_session); |
1665 | ||
1666 | if (session->kernel_session->channel_count == 0) { | |
1667 | /* Create default channel */ | |
1668 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); | |
1669 | if (ret != LTTNG_OK) { | |
1670 | goto error; | |
1671 | } | |
d5979e4a | 1672 | chan_kern_created = 1; |
979e618e | 1673 | } |
2f77fc4b | 1674 | /* Add kernel context to kernel tracer */ |
601d5acf | 1675 | ret = context_kernel_add(session->kernel_session, ctx, channel_name); |
f73fabfd | 1676 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1677 | goto error; |
1678 | } | |
1679 | break; | |
bdf64013 JG |
1680 | case LTTNG_DOMAIN_JUL: |
1681 | case LTTNG_DOMAIN_LOG4J: | |
1682 | { | |
1683 | /* | |
1684 | * Validate channel name. | |
1685 | * If no channel name is given and the domain is JUL or LOG4J, | |
1686 | * set it to the appropriate domain-specific channel name. If | |
1687 | * a name is provided but does not match the expexted channel | |
1688 | * name, return an error. | |
1689 | */ | |
1690 | if (domain == LTTNG_DOMAIN_JUL && *channel_name && | |
1691 | strcmp(channel_name, | |
1692 | DEFAULT_JUL_CHANNEL_NAME)) { | |
1693 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1694 | goto error; | |
1695 | } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name && | |
1696 | strcmp(channel_name, | |
1697 | DEFAULT_LOG4J_CHANNEL_NAME)) { | |
1698 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1699 | goto error; | |
1700 | } | |
a93b3916 | 1701 | /* break is _not_ missing here. */ |
bdf64013 | 1702 | } |
2f77fc4b DG |
1703 | case LTTNG_DOMAIN_UST: |
1704 | { | |
1705 | struct ltt_ust_session *usess = session->ust_session; | |
85076754 MD |
1706 | unsigned int chan_count; |
1707 | ||
2f77fc4b DG |
1708 | assert(usess); |
1709 | ||
85076754 | 1710 | chan_count = lttng_ht_get_count(usess->domain_global.channels); |
979e618e DG |
1711 | if (chan_count == 0) { |
1712 | struct lttng_channel *attr; | |
1713 | /* Create default channel */ | |
0a9c6494 | 1714 | attr = channel_new_default_attr(domain, usess->buffer_type); |
979e618e DG |
1715 | if (attr == NULL) { |
1716 | ret = LTTNG_ERR_FATAL; | |
1717 | goto error; | |
1718 | } | |
1719 | ||
7972aab2 | 1720 | ret = channel_ust_create(usess, attr, usess->buffer_type); |
979e618e DG |
1721 | if (ret != LTTNG_OK) { |
1722 | free(attr); | |
1723 | goto error; | |
1724 | } | |
cf0bcb51 | 1725 | channel_attr_destroy(attr); |
d5979e4a | 1726 | chan_ust_created = 1; |
979e618e DG |
1727 | } |
1728 | ||
601d5acf | 1729 | ret = context_ust_add(usess, domain, ctx, channel_name); |
bdf64013 JG |
1730 | free(app_ctx_provider_name); |
1731 | free(app_ctx_name); | |
1732 | app_ctx_name = NULL; | |
1733 | app_ctx_provider_name = NULL; | |
f73fabfd | 1734 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1735 | goto error; |
1736 | } | |
1737 | break; | |
1738 | } | |
2f77fc4b | 1739 | default: |
f73fabfd | 1740 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1741 | goto error; |
1742 | } | |
1743 | ||
bdf64013 JG |
1744 | ret = LTTNG_OK; |
1745 | goto end; | |
2f77fc4b DG |
1746 | |
1747 | error: | |
d5979e4a DG |
1748 | if (chan_kern_created) { |
1749 | struct ltt_kernel_channel *kchan = | |
1750 | trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME, | |
1751 | session->kernel_session); | |
1752 | /* Created previously, this should NOT fail. */ | |
1753 | assert(kchan); | |
1754 | kernel_destroy_channel(kchan); | |
1755 | } | |
1756 | ||
1757 | if (chan_ust_created) { | |
1758 | struct ltt_ust_channel *uchan = | |
1759 | trace_ust_find_channel_by_name( | |
1760 | session->ust_session->domain_global.channels, | |
1761 | DEFAULT_CHANNEL_NAME); | |
1762 | /* Created previously, this should NOT fail. */ | |
1763 | assert(uchan); | |
1764 | /* Remove from the channel list of the session. */ | |
1765 | trace_ust_delete_channel(session->ust_session->domain_global.channels, | |
1766 | uchan); | |
1767 | trace_ust_destroy_channel(uchan); | |
1768 | } | |
bdf64013 JG |
1769 | end: |
1770 | free(app_ctx_provider_name); | |
1771 | free(app_ctx_name); | |
2f77fc4b DG |
1772 | return ret; |
1773 | } | |
1774 | ||
dac8e046 JG |
1775 | static inline bool name_starts_with(const char *name, const char *prefix) |
1776 | { | |
1777 | const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN); | |
1778 | ||
1779 | return !strncmp(name, prefix, max_cmp_len); | |
1780 | } | |
1781 | ||
1782 | /* Perform userspace-specific event name validation */ | |
1783 | static int validate_ust_event_name(const char *name) | |
1784 | { | |
1785 | int ret = 0; | |
1786 | ||
1787 | if (!name) { | |
1788 | ret = -1; | |
1789 | goto end; | |
1790 | } | |
1791 | ||
1792 | /* | |
1793 | * Check name against all internal UST event component namespaces used | |
1794 | * by the agents. | |
1795 | */ | |
1796 | if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) || | |
1797 | name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) || | |
1798 | name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) { | |
1799 | ret = -1; | |
1800 | } | |
1801 | ||
1802 | end: | |
1803 | return ret; | |
1804 | } | |
88f06f15 | 1805 | |
2f77fc4b | 1806 | /* |
88f06f15 JG |
1807 | * Internal version of cmd_enable_event() with a supplemental |
1808 | * "internal_event" flag which is used to enable internal events which should | |
1809 | * be hidden from clients. Such events are used in the agent implementation to | |
1810 | * enable the events through which all "agent" events are funeled. | |
2f77fc4b | 1811 | */ |
88f06f15 JG |
1812 | static int _cmd_enable_event(struct ltt_session *session, |
1813 | struct lttng_domain *domain, | |
025faf73 | 1814 | char *channel_name, struct lttng_event *event, |
6b453b5e | 1815 | char *filter_expression, |
db8f1377 JI |
1816 | struct lttng_filter_bytecode *filter, |
1817 | struct lttng_event_exclusion *exclusion, | |
88f06f15 | 1818 | int wpipe, bool internal_event) |
2f77fc4b | 1819 | { |
9f449915 | 1820 | int ret = 0, channel_created = 0; |
cfedea03 | 1821 | struct lttng_channel *attr = NULL; |
2f77fc4b DG |
1822 | |
1823 | assert(session); | |
1824 | assert(event); | |
1825 | assert(channel_name); | |
1826 | ||
2a385866 JG |
1827 | /* If we have a filter, we must have its filter expression */ |
1828 | assert(!(!!filter_expression ^ !!filter)); | |
1829 | ||
9f449915 PP |
1830 | /* Normalize event name as a globbing pattern */ |
1831 | strutils_normalize_star_glob_pattern(event->name); | |
18a720cd | 1832 | |
9f449915 PP |
1833 | /* Normalize exclusion names as globbing patterns */ |
1834 | if (exclusion) { | |
1835 | size_t i; | |
f5ac4bd7 | 1836 | |
9f449915 PP |
1837 | for (i = 0; i < exclusion->count; i++) { |
1838 | char *name = LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i); | |
1839 | ||
1840 | strutils_normalize_star_glob_pattern(name); | |
1841 | } | |
930a2e99 JG |
1842 | } |
1843 | ||
9f449915 PP |
1844 | DBG("Enable event command for event \'%s\'", event->name); |
1845 | ||
1846 | rcu_read_lock(); | |
1847 | ||
7972aab2 | 1848 | switch (domain->type) { |
2f77fc4b DG |
1849 | case LTTNG_DOMAIN_KERNEL: |
1850 | { | |
1851 | struct ltt_kernel_channel *kchan; | |
1852 | ||
85076754 MD |
1853 | /* |
1854 | * If a non-default channel has been created in the | |
1855 | * session, explicitely require that -c chan_name needs | |
1856 | * to be provided. | |
1857 | */ | |
1858 | if (session->kernel_session->has_non_default_channel | |
1859 | && channel_name[0] == '\0') { | |
1860 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1861 | goto error; | |
1862 | } | |
1863 | ||
2f77fc4b DG |
1864 | kchan = trace_kernel_get_channel_by_name(channel_name, |
1865 | session->kernel_session); | |
1866 | if (kchan == NULL) { | |
0a9c6494 DG |
1867 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
1868 | LTTNG_BUFFER_GLOBAL); | |
2f77fc4b | 1869 | if (attr == NULL) { |
f73fabfd | 1870 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1871 | goto error; |
1872 | } | |
04c17253 MD |
1873 | if (lttng_strncpy(attr->name, channel_name, |
1874 | sizeof(attr->name))) { | |
1875 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
1876 | goto error; |
1877 | } | |
2f77fc4b DG |
1878 | |
1879 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1880 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1881 | goto error; |
1882 | } | |
e5f5db7f | 1883 | channel_created = 1; |
2f77fc4b DG |
1884 | } |
1885 | ||
1886 | /* Get the newly created kernel channel pointer */ | |
1887 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1888 | session->kernel_session); | |
1889 | if (kchan == NULL) { | |
1890 | /* This sould not happen... */ | |
f73fabfd | 1891 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1892 | goto error; |
1893 | } | |
1894 | ||
6e911cad MD |
1895 | switch (event->type) { |
1896 | case LTTNG_EVENT_ALL: | |
29c62722 | 1897 | { |
00a62084 MD |
1898 | char *filter_expression_a = NULL; |
1899 | struct lttng_filter_bytecode *filter_a = NULL; | |
1900 | ||
1901 | /* | |
1902 | * We need to duplicate filter_expression and filter, | |
1903 | * because ownership is passed to first enable | |
1904 | * event. | |
1905 | */ | |
1906 | if (filter_expression) { | |
1907 | filter_expression_a = strdup(filter_expression); | |
1908 | if (!filter_expression_a) { | |
1909 | ret = LTTNG_ERR_FATAL; | |
1910 | goto error; | |
1911 | } | |
1912 | } | |
1913 | if (filter) { | |
1914 | filter_a = zmalloc(sizeof(*filter_a) + filter->len); | |
1915 | if (!filter_a) { | |
1916 | free(filter_expression_a); | |
1917 | ret = LTTNG_ERR_FATAL; | |
1918 | goto error; | |
1919 | } | |
1920 | memcpy(filter_a, filter, sizeof(*filter_a) + filter->len); | |
1921 | } | |
29c62722 | 1922 | event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */ |
00a62084 MD |
1923 | ret = event_kernel_enable_event(kchan, event, |
1924 | filter_expression, filter); | |
a969e101 MD |
1925 | /* We have passed ownership */ |
1926 | filter_expression = NULL; | |
1927 | filter = NULL; | |
29c62722 MD |
1928 | if (ret != LTTNG_OK) { |
1929 | if (channel_created) { | |
1930 | /* Let's not leak a useless channel. */ | |
1931 | kernel_destroy_channel(kchan); | |
1932 | } | |
00a62084 MD |
1933 | free(filter_expression_a); |
1934 | free(filter_a); | |
29c62722 MD |
1935 | goto error; |
1936 | } | |
1937 | event->type = LTTNG_EVENT_SYSCALL; /* Hack */ | |
00a62084 MD |
1938 | ret = event_kernel_enable_event(kchan, event, |
1939 | filter_expression_a, filter_a); | |
60d21fa2 AB |
1940 | /* We have passed ownership */ |
1941 | filter_expression_a = NULL; | |
1942 | filter_a = NULL; | |
29c62722 MD |
1943 | if (ret != LTTNG_OK) { |
1944 | goto error; | |
1945 | } | |
1946 | break; | |
1947 | } | |
6e6ef3d7 DG |
1948 | case LTTNG_EVENT_PROBE: |
1949 | case LTTNG_EVENT_FUNCTION: | |
1950 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
6e911cad | 1951 | case LTTNG_EVENT_TRACEPOINT: |
00a62084 MD |
1952 | ret = event_kernel_enable_event(kchan, event, |
1953 | filter_expression, filter); | |
a969e101 MD |
1954 | /* We have passed ownership */ |
1955 | filter_expression = NULL; | |
1956 | filter = NULL; | |
6e911cad MD |
1957 | if (ret != LTTNG_OK) { |
1958 | if (channel_created) { | |
1959 | /* Let's not leak a useless channel. */ | |
1960 | kernel_destroy_channel(kchan); | |
1961 | } | |
1962 | goto error; | |
e5f5db7f | 1963 | } |
6e911cad MD |
1964 | break; |
1965 | case LTTNG_EVENT_SYSCALL: | |
00a62084 MD |
1966 | ret = event_kernel_enable_event(kchan, event, |
1967 | filter_expression, filter); | |
a969e101 MD |
1968 | /* We have passed ownership */ |
1969 | filter_expression = NULL; | |
1970 | filter = NULL; | |
e2b957af MD |
1971 | if (ret != LTTNG_OK) { |
1972 | goto error; | |
1973 | } | |
6e911cad MD |
1974 | break; |
1975 | default: | |
1976 | ret = LTTNG_ERR_UNK; | |
2f77fc4b DG |
1977 | goto error; |
1978 | } | |
1979 | ||
1980 | kernel_wait_quiescent(kernel_tracer_fd); | |
1981 | break; | |
1982 | } | |
1983 | case LTTNG_DOMAIN_UST: | |
1984 | { | |
1985 | struct ltt_ust_channel *uchan; | |
1986 | struct ltt_ust_session *usess = session->ust_session; | |
1987 | ||
1988 | assert(usess); | |
1989 | ||
85076754 MD |
1990 | /* |
1991 | * If a non-default channel has been created in the | |
1992 | * session, explicitely require that -c chan_name needs | |
1993 | * to be provided. | |
1994 | */ | |
1995 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1996 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1997 | goto error; | |
1998 | } | |
1999 | ||
2f77fc4b DG |
2000 | /* Get channel from global UST domain */ |
2001 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2002 | channel_name); | |
2003 | if (uchan == NULL) { | |
2004 | /* Create default channel */ | |
0a9c6494 DG |
2005 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
2006 | usess->buffer_type); | |
2f77fc4b | 2007 | if (attr == NULL) { |
f73fabfd | 2008 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2009 | goto error; |
2010 | } | |
04c17253 MD |
2011 | if (lttng_strncpy(attr->name, channel_name, |
2012 | sizeof(attr->name))) { | |
2013 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
2014 | goto error; |
2015 | } | |
2f77fc4b DG |
2016 | |
2017 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 2018 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2019 | goto error; |
2020 | } | |
2f77fc4b DG |
2021 | |
2022 | /* Get the newly created channel reference back */ | |
2023 | uchan = trace_ust_find_channel_by_name( | |
2024 | usess->domain_global.channels, channel_name); | |
2025 | assert(uchan); | |
2026 | } | |
2027 | ||
141feb8c JG |
2028 | if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) { |
2029 | /* | |
2030 | * Don't allow users to add UST events to channels which | |
2031 | * are assigned to a userspace subdomain (JUL, Log4J, | |
2032 | * Python, etc.). | |
2033 | */ | |
2034 | ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN; | |
2035 | goto error; | |
2036 | } | |
2037 | ||
dac8e046 JG |
2038 | if (!internal_event) { |
2039 | /* | |
2040 | * Ensure the event name is not reserved for internal | |
2041 | * use. | |
2042 | */ | |
2043 | ret = validate_ust_event_name(event->name); | |
2044 | if (ret) { | |
2045 | WARN("Userspace event name %s failed validation.", | |
2046 | event->name ? | |
2047 | event->name : "NULL"); | |
2048 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
2049 | goto error; | |
2050 | } | |
2051 | } | |
2052 | ||
2f77fc4b | 2053 | /* At this point, the session and channel exist on the tracer */ |
6b453b5e | 2054 | ret = event_ust_enable_tracepoint(usess, uchan, event, |
88f06f15 JG |
2055 | filter_expression, filter, exclusion, |
2056 | internal_event); | |
49d21f93 MD |
2057 | /* We have passed ownership */ |
2058 | filter_expression = NULL; | |
2059 | filter = NULL; | |
2060 | exclusion = NULL; | |
94382e15 JG |
2061 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2062 | goto already_enabled; | |
2063 | } else if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2064 | goto error; |
2065 | } | |
2066 | break; | |
2067 | } | |
5cdb6027 | 2068 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 2069 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2070 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 2071 | { |
da6c3a50 | 2072 | const char *default_event_name, *default_chan_name; |
fefd409b | 2073 | struct agent *agt; |
f20baf8e DG |
2074 | struct lttng_event uevent; |
2075 | struct lttng_domain tmp_dom; | |
2076 | struct ltt_ust_session *usess = session->ust_session; | |
2077 | ||
2078 | assert(usess); | |
2079 | ||
5cdb6027 | 2080 | agt = trace_ust_find_agent(usess, domain->type); |
fefd409b | 2081 | if (!agt) { |
5cdb6027 | 2082 | agt = agent_create(domain->type); |
fefd409b | 2083 | if (!agt) { |
e5b3c48c | 2084 | ret = LTTNG_ERR_NOMEM; |
fefd409b DG |
2085 | goto error; |
2086 | } | |
2087 | agent_add(agt, usess->agents); | |
2088 | } | |
2089 | ||
022d91ba | 2090 | /* Create the default tracepoint. */ |
996de3c7 | 2091 | memset(&uevent, 0, sizeof(uevent)); |
f20baf8e DG |
2092 | uevent.type = LTTNG_EVENT_TRACEPOINT; |
2093 | uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
51755dc8 JG |
2094 | default_event_name = event_get_default_agent_ust_name( |
2095 | domain->type); | |
da6c3a50 | 2096 | if (!default_event_name) { |
e5b3c48c | 2097 | ret = LTTNG_ERR_FATAL; |
da6c3a50 | 2098 | goto error; |
f43f95a9 | 2099 | } |
da6c3a50 | 2100 | strncpy(uevent.name, default_event_name, sizeof(uevent.name)); |
f20baf8e DG |
2101 | uevent.name[sizeof(uevent.name) - 1] = '\0'; |
2102 | ||
2103 | /* | |
2104 | * The domain type is changed because we are about to enable the | |
2105 | * default channel and event for the JUL domain that are hardcoded. | |
2106 | * This happens in the UST domain. | |
2107 | */ | |
2108 | memcpy(&tmp_dom, domain, sizeof(tmp_dom)); | |
2109 | tmp_dom.type = LTTNG_DOMAIN_UST; | |
2110 | ||
0e115563 DG |
2111 | switch (domain->type) { |
2112 | case LTTNG_DOMAIN_LOG4J: | |
da6c3a50 | 2113 | default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME; |
0e115563 DG |
2114 | break; |
2115 | case LTTNG_DOMAIN_JUL: | |
da6c3a50 | 2116 | default_chan_name = DEFAULT_JUL_CHANNEL_NAME; |
0e115563 DG |
2117 | break; |
2118 | case LTTNG_DOMAIN_PYTHON: | |
2119 | default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
2120 | break; | |
2121 | default: | |
e98a44b0 | 2122 | /* The switch/case we are in makes this impossible */ |
0e115563 | 2123 | assert(0); |
da6c3a50 DG |
2124 | } |
2125 | ||
971da06a | 2126 | { |
8404118c | 2127 | char *filter_expression_copy = NULL; |
51755dc8 | 2128 | struct lttng_filter_bytecode *filter_copy = NULL; |
971da06a JG |
2129 | |
2130 | if (filter) { | |
51755dc8 JG |
2131 | const size_t filter_size = sizeof( |
2132 | struct lttng_filter_bytecode) | |
2133 | + filter->len; | |
2134 | ||
2135 | filter_copy = zmalloc(filter_size); | |
971da06a | 2136 | if (!filter_copy) { |
018096a4 | 2137 | ret = LTTNG_ERR_NOMEM; |
b742e3e2 | 2138 | goto error; |
971da06a | 2139 | } |
51755dc8 | 2140 | memcpy(filter_copy, filter, filter_size); |
971da06a | 2141 | |
8404118c JG |
2142 | filter_expression_copy = |
2143 | strdup(filter_expression); | |
2144 | if (!filter_expression) { | |
2145 | ret = LTTNG_ERR_NOMEM; | |
51755dc8 JG |
2146 | } |
2147 | ||
2148 | if (!filter_expression_copy || !filter_copy) { | |
2149 | free(filter_expression_copy); | |
2150 | free(filter_copy); | |
2151 | goto error; | |
8404118c | 2152 | } |
971da06a JG |
2153 | } |
2154 | ||
88f06f15 | 2155 | ret = cmd_enable_event_internal(session, &tmp_dom, |
971da06a | 2156 | (char *) default_chan_name, |
8404118c JG |
2157 | &uevent, filter_expression_copy, |
2158 | filter_copy, NULL, wpipe); | |
971da06a JG |
2159 | } |
2160 | ||
94382e15 JG |
2161 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2162 | goto already_enabled; | |
2163 | } else if (ret != LTTNG_OK) { | |
f20baf8e DG |
2164 | goto error; |
2165 | } | |
2166 | ||
2167 | /* The wild card * means that everything should be enabled. */ | |
2168 | if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) { | |
8404118c JG |
2169 | ret = event_agent_enable_all(usess, agt, event, filter, |
2170 | filter_expression); | |
f20baf8e | 2171 | } else { |
8404118c JG |
2172 | ret = event_agent_enable(usess, agt, event, filter, |
2173 | filter_expression); | |
f20baf8e | 2174 | } |
51755dc8 JG |
2175 | filter = NULL; |
2176 | filter_expression = NULL; | |
f20baf8e DG |
2177 | if (ret != LTTNG_OK) { |
2178 | goto error; | |
2179 | } | |
2180 | ||
2181 | break; | |
2182 | } | |
2f77fc4b | 2183 | default: |
f73fabfd | 2184 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2185 | goto error; |
2186 | } | |
2187 | ||
f73fabfd | 2188 | ret = LTTNG_OK; |
2f77fc4b | 2189 | |
94382e15 | 2190 | already_enabled: |
2f77fc4b | 2191 | error: |
49d21f93 MD |
2192 | free(filter_expression); |
2193 | free(filter); | |
2194 | free(exclusion); | |
cf0bcb51 | 2195 | channel_attr_destroy(attr); |
2223c96f | 2196 | rcu_read_unlock(); |
2f77fc4b DG |
2197 | return ret; |
2198 | } | |
2199 | ||
88f06f15 JG |
2200 | /* |
2201 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2202 | * We own filter, exclusion, and filter_expression. | |
2203 | */ | |
2204 | int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain, | |
2205 | char *channel_name, struct lttng_event *event, | |
2206 | char *filter_expression, | |
2207 | struct lttng_filter_bytecode *filter, | |
2208 | struct lttng_event_exclusion *exclusion, | |
2209 | int wpipe) | |
2210 | { | |
2211 | return _cmd_enable_event(session, domain, channel_name, event, | |
2212 | filter_expression, filter, exclusion, wpipe, false); | |
2213 | } | |
2214 | ||
2215 | /* | |
2216 | * Enable an event which is internal to LTTng. An internal should | |
2217 | * never be made visible to clients and are immune to checks such as | |
2218 | * reserved names. | |
2219 | */ | |
2220 | static int cmd_enable_event_internal(struct ltt_session *session, | |
2221 | struct lttng_domain *domain, | |
2222 | char *channel_name, struct lttng_event *event, | |
2223 | char *filter_expression, | |
2224 | struct lttng_filter_bytecode *filter, | |
2225 | struct lttng_event_exclusion *exclusion, | |
2226 | int wpipe) | |
2227 | { | |
2228 | return _cmd_enable_event(session, domain, channel_name, event, | |
2229 | filter_expression, filter, exclusion, wpipe, true); | |
2230 | } | |
2231 | ||
2f77fc4b DG |
2232 | /* |
2233 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2234 | */ | |
56a37563 JG |
2235 | ssize_t cmd_list_tracepoints(enum lttng_domain_type domain, |
2236 | struct lttng_event **events) | |
2f77fc4b DG |
2237 | { |
2238 | int ret; | |
2239 | ssize_t nb_events = 0; | |
2240 | ||
2241 | switch (domain) { | |
2242 | case LTTNG_DOMAIN_KERNEL: | |
2243 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2244 | if (nb_events < 0) { | |
f73fabfd | 2245 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
2f77fc4b DG |
2246 | goto error; |
2247 | } | |
2248 | break; | |
2249 | case LTTNG_DOMAIN_UST: | |
2250 | nb_events = ust_app_list_events(events); | |
2251 | if (nb_events < 0) { | |
f73fabfd | 2252 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2253 | goto error; |
2254 | } | |
2255 | break; | |
5cdb6027 | 2256 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2257 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2258 | case LTTNG_DOMAIN_PYTHON: |
f60140a1 | 2259 | nb_events = agent_list_events(events, domain); |
3c6a091f DG |
2260 | if (nb_events < 0) { |
2261 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2262 | goto error; | |
2263 | } | |
2264 | break; | |
2f77fc4b | 2265 | default: |
f73fabfd | 2266 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2267 | goto error; |
2268 | } | |
2269 | ||
2270 | return nb_events; | |
2271 | ||
2272 | error: | |
2273 | /* Return negative value to differentiate return code */ | |
2274 | return -ret; | |
2275 | } | |
2276 | ||
2277 | /* | |
2278 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
2279 | */ | |
56a37563 | 2280 | ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain, |
2f77fc4b DG |
2281 | struct lttng_event_field **fields) |
2282 | { | |
2283 | int ret; | |
2284 | ssize_t nb_fields = 0; | |
2285 | ||
2286 | switch (domain) { | |
2287 | case LTTNG_DOMAIN_UST: | |
2288 | nb_fields = ust_app_list_event_fields(fields); | |
2289 | if (nb_fields < 0) { | |
f73fabfd | 2290 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2291 | goto error; |
2292 | } | |
2293 | break; | |
2294 | case LTTNG_DOMAIN_KERNEL: | |
2295 | default: /* fall-through */ | |
f73fabfd | 2296 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2297 | goto error; |
2298 | } | |
2299 | ||
2300 | return nb_fields; | |
2301 | ||
2302 | error: | |
2303 | /* Return negative value to differentiate return code */ | |
2304 | return -ret; | |
2305 | } | |
2306 | ||
834978fd DG |
2307 | ssize_t cmd_list_syscalls(struct lttng_event **events) |
2308 | { | |
2309 | return syscall_table_list(events); | |
2310 | } | |
2311 | ||
a5dfbb9d MD |
2312 | /* |
2313 | * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread. | |
2314 | * | |
2315 | * Called with session lock held. | |
2316 | */ | |
2317 | ssize_t cmd_list_tracker_pids(struct ltt_session *session, | |
56a37563 | 2318 | enum lttng_domain_type domain, int32_t **pids) |
a5dfbb9d MD |
2319 | { |
2320 | int ret; | |
2321 | ssize_t nr_pids = 0; | |
2322 | ||
2323 | switch (domain) { | |
2324 | case LTTNG_DOMAIN_KERNEL: | |
2325 | { | |
2326 | struct ltt_kernel_session *ksess; | |
2327 | ||
2328 | ksess = session->kernel_session; | |
2329 | nr_pids = kernel_list_tracker_pids(ksess, pids); | |
2330 | if (nr_pids < 0) { | |
2331 | ret = LTTNG_ERR_KERN_LIST_FAIL; | |
2332 | goto error; | |
2333 | } | |
2334 | break; | |
2335 | } | |
2336 | case LTTNG_DOMAIN_UST: | |
2337 | { | |
2338 | struct ltt_ust_session *usess; | |
2339 | ||
2340 | usess = session->ust_session; | |
2341 | nr_pids = trace_ust_list_tracker_pids(usess, pids); | |
2342 | if (nr_pids < 0) { | |
2343 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2344 | goto error; | |
2345 | } | |
2346 | break; | |
2347 | } | |
2348 | case LTTNG_DOMAIN_LOG4J: | |
2349 | case LTTNG_DOMAIN_JUL: | |
2350 | case LTTNG_DOMAIN_PYTHON: | |
2351 | default: | |
2352 | ret = LTTNG_ERR_UND; | |
2353 | goto error; | |
2354 | } | |
2355 | ||
2356 | return nr_pids; | |
2357 | ||
2358 | error: | |
2359 | /* Return negative value to differentiate return code */ | |
2360 | return -ret; | |
2361 | } | |
2362 | ||
2f77fc4b DG |
2363 | /* |
2364 | * Command LTTNG_START_TRACE processed by the client thread. | |
a9ad0c8f MD |
2365 | * |
2366 | * Called with session mutex held. | |
2f77fc4b DG |
2367 | */ |
2368 | int cmd_start_trace(struct ltt_session *session) | |
2369 | { | |
2370 | int ret; | |
cde3e505 | 2371 | unsigned long nb_chan = 0; |
2f77fc4b DG |
2372 | struct ltt_kernel_session *ksession; |
2373 | struct ltt_ust_session *usess; | |
2f77fc4b DG |
2374 | |
2375 | assert(session); | |
2376 | ||
2377 | /* Ease our life a bit ;) */ | |
2378 | ksession = session->kernel_session; | |
2379 | usess = session->ust_session; | |
2380 | ||
8382cf6f DG |
2381 | /* Is the session already started? */ |
2382 | if (session->active) { | |
f73fabfd | 2383 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2384 | goto error; |
2385 | } | |
2386 | ||
cde3e505 DG |
2387 | /* |
2388 | * Starting a session without channel is useless since after that it's not | |
2389 | * possible to enable channel thus inform the client. | |
2390 | */ | |
2391 | if (usess && usess->domain_global.channels) { | |
2392 | nb_chan += lttng_ht_get_count(usess->domain_global.channels); | |
2393 | } | |
2394 | if (ksession) { | |
2395 | nb_chan += ksession->channel_count; | |
2396 | } | |
2397 | if (!nb_chan) { | |
2398 | ret = LTTNG_ERR_NO_CHANNEL; | |
2399 | goto error; | |
2400 | } | |
2401 | ||
2f77fc4b DG |
2402 | /* Kernel tracing */ |
2403 | if (ksession != NULL) { | |
9b6c7ec5 DG |
2404 | ret = start_kernel_session(ksession, kernel_tracer_fd); |
2405 | if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2406 | goto error; |
2407 | } | |
2f77fc4b DG |
2408 | } |
2409 | ||
2410 | /* Flag session that trace should start automatically */ | |
2411 | if (usess) { | |
14fb1ebe DG |
2412 | /* |
2413 | * Even though the start trace might fail, flag this session active so | |
2414 | * other application coming in are started by default. | |
2415 | */ | |
2416 | usess->active = 1; | |
2f77fc4b DG |
2417 | |
2418 | ret = ust_app_start_trace_all(usess); | |
2419 | if (ret < 0) { | |
f73fabfd | 2420 | ret = LTTNG_ERR_UST_START_FAIL; |
2f77fc4b DG |
2421 | goto error; |
2422 | } | |
2423 | } | |
2424 | ||
8382cf6f DG |
2425 | /* Flag this after a successful start. */ |
2426 | session->has_been_started = 1; | |
2427 | session->active = 1; | |
9b6c7ec5 | 2428 | |
f73fabfd | 2429 | ret = LTTNG_OK; |
2f77fc4b DG |
2430 | |
2431 | error: | |
2432 | return ret; | |
2433 | } | |
2434 | ||
2435 | /* | |
2436 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2437 | */ | |
2438 | int cmd_stop_trace(struct ltt_session *session) | |
2439 | { | |
2440 | int ret; | |
2441 | struct ltt_kernel_channel *kchan; | |
2442 | struct ltt_kernel_session *ksession; | |
2443 | struct ltt_ust_session *usess; | |
2444 | ||
2445 | assert(session); | |
2446 | ||
2447 | /* Short cut */ | |
2448 | ksession = session->kernel_session; | |
2449 | usess = session->ust_session; | |
2450 | ||
8382cf6f DG |
2451 | /* Session is not active. Skip everythong and inform the client. */ |
2452 | if (!session->active) { | |
f73fabfd | 2453 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
2f77fc4b DG |
2454 | goto error; |
2455 | } | |
2456 | ||
2f77fc4b | 2457 | /* Kernel tracer */ |
14fb1ebe | 2458 | if (ksession && ksession->active) { |
2f77fc4b DG |
2459 | DBG("Stop kernel tracing"); |
2460 | ||
566d8970 MD |
2461 | ret = kernel_stop_session(ksession); |
2462 | if (ret < 0) { | |
2463 | ret = LTTNG_ERR_KERN_STOP_FAIL; | |
2464 | goto error; | |
2465 | } | |
2466 | ||
2467 | kernel_wait_quiescent(kernel_tracer_fd); | |
2468 | ||
2469 | /* Flush metadata after stopping (if exists) */ | |
2f77fc4b DG |
2470 | if (ksession->metadata_stream_fd >= 0) { |
2471 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2472 | if (ret < 0) { | |
2473 | ERR("Kernel metadata flush failed"); | |
2474 | } | |
2475 | } | |
2476 | ||
566d8970 | 2477 | /* Flush all buffers after stopping */ |
2f77fc4b DG |
2478 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2479 | ret = kernel_flush_buffer(kchan); | |
2480 | if (ret < 0) { | |
2481 | ERR("Kernel flush buffer error"); | |
2482 | } | |
2483 | } | |
2484 | ||
14fb1ebe | 2485 | ksession->active = 0; |
2f77fc4b DG |
2486 | } |
2487 | ||
14fb1ebe DG |
2488 | if (usess && usess->active) { |
2489 | /* | |
2490 | * Even though the stop trace might fail, flag this session inactive so | |
2491 | * other application coming in are not started by default. | |
2492 | */ | |
2493 | usess->active = 0; | |
2f77fc4b DG |
2494 | |
2495 | ret = ust_app_stop_trace_all(usess); | |
2496 | if (ret < 0) { | |
f73fabfd | 2497 | ret = LTTNG_ERR_UST_STOP_FAIL; |
2f77fc4b DG |
2498 | goto error; |
2499 | } | |
2500 | } | |
2501 | ||
8382cf6f DG |
2502 | /* Flag inactive after a successful stop. */ |
2503 | session->active = 0; | |
f73fabfd | 2504 | ret = LTTNG_OK; |
2f77fc4b DG |
2505 | |
2506 | error: | |
2507 | return ret; | |
2508 | } | |
2509 | ||
2510 | /* | |
2511 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
2512 | */ | |
bda32d56 JG |
2513 | int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri, |
2514 | struct lttng_uri *uris) | |
2f77fc4b DG |
2515 | { |
2516 | int ret, i; | |
2517 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2518 | struct ltt_ust_session *usess = session->ust_session; | |
2f77fc4b DG |
2519 | |
2520 | assert(session); | |
2521 | assert(uris); | |
2522 | assert(nb_uri > 0); | |
2523 | ||
8382cf6f DG |
2524 | /* Can't set consumer URI if the session is active. */ |
2525 | if (session->active) { | |
f73fabfd | 2526 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2527 | goto error; |
2528 | } | |
2529 | ||
bda32d56 | 2530 | /* Set the "global" consumer URIs */ |
2f77fc4b | 2531 | for (i = 0; i < nb_uri; i++) { |
bda32d56 JG |
2532 | ret = add_uri_to_consumer(session->consumer, |
2533 | &uris[i], 0, session->name); | |
a74934ba | 2534 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2535 | goto error; |
2536 | } | |
2f77fc4b DG |
2537 | } |
2538 | ||
bda32d56 JG |
2539 | /* Set UST session URIs */ |
2540 | if (session->ust_session) { | |
2541 | for (i = 0; i < nb_uri; i++) { | |
2542 | ret = add_uri_to_consumer( | |
2543 | session->ust_session->consumer, | |
2544 | &uris[i], LTTNG_DOMAIN_UST, | |
2545 | session->name); | |
2546 | if (ret != LTTNG_OK) { | |
2547 | goto error; | |
2548 | } | |
2549 | } | |
2550 | } | |
2551 | ||
2552 | /* Set kernel session URIs */ | |
2553 | if (session->kernel_session) { | |
2554 | for (i = 0; i < nb_uri; i++) { | |
2555 | ret = add_uri_to_consumer( | |
2556 | session->kernel_session->consumer, | |
2557 | &uris[i], LTTNG_DOMAIN_KERNEL, | |
2558 | session->name); | |
2559 | if (ret != LTTNG_OK) { | |
2560 | goto error; | |
2561 | } | |
2562 | } | |
2563 | } | |
2564 | ||
7ab70fe0 DG |
2565 | /* |
2566 | * Make sure to set the session in output mode after we set URI since a | |
2567 | * session can be created without URL (thus flagged in no output mode). | |
2568 | */ | |
2569 | session->output_traces = 1; | |
2570 | if (ksess) { | |
2571 | ksess->output_traces = 1; | |
bda32d56 JG |
2572 | } |
2573 | ||
2574 | if (usess) { | |
7ab70fe0 DG |
2575 | usess->output_traces = 1; |
2576 | } | |
2577 | ||
2f77fc4b | 2578 | /* All good! */ |
f73fabfd | 2579 | ret = LTTNG_OK; |
2f77fc4b DG |
2580 | |
2581 | error: | |
2582 | return ret; | |
2583 | } | |
2584 | ||
2585 | /* | |
2586 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2587 | */ | |
2588 | int cmd_create_session_uri(char *name, struct lttng_uri *uris, | |
ecc48a90 | 2589 | size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer) |
2f77fc4b DG |
2590 | { |
2591 | int ret; | |
2f77fc4b DG |
2592 | struct ltt_session *session; |
2593 | ||
2594 | assert(name); | |
2bba9e53 | 2595 | assert(creds); |
785d2d0d | 2596 | |
2f77fc4b DG |
2597 | /* |
2598 | * Verify if the session already exist | |
2599 | * | |
2600 | * XXX: There is no need for the session lock list here since the caller | |
2601 | * (process_client_msg) is holding it. We might want to change that so a | |
2602 | * single command does not lock the entire session list. | |
2603 | */ | |
2604 | session = session_find_by_name(name); | |
2605 | if (session != NULL) { | |
f73fabfd | 2606 | ret = LTTNG_ERR_EXIST_SESS; |
2f77fc4b DG |
2607 | goto find_error; |
2608 | } | |
2609 | ||
2610 | /* Create tracing session in the registry */ | |
dec56f6c | 2611 | ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds), |
2f77fc4b | 2612 | LTTNG_SOCK_GET_GID_CRED(creds)); |
f73fabfd | 2613 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2614 | goto session_error; |
2615 | } | |
2616 | ||
2617 | /* | |
2618 | * Get the newly created session pointer back | |
2619 | * | |
2620 | * XXX: There is no need for the session lock list here since the caller | |
2621 | * (process_client_msg) is holding it. We might want to change that so a | |
2622 | * single command does not lock the entire session list. | |
2623 | */ | |
2624 | session = session_find_by_name(name); | |
2625 | assert(session); | |
2626 | ||
ecc48a90 | 2627 | session->live_timer = live_timer; |
2f77fc4b DG |
2628 | /* Create default consumer output for the session not yet created. */ |
2629 | session->consumer = consumer_create_output(CONSUMER_DST_LOCAL); | |
2630 | if (session->consumer == NULL) { | |
f73fabfd | 2631 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2632 | goto consumer_error; |
2633 | } | |
2634 | ||
2bba9e53 | 2635 | if (uris) { |
bda32d56 | 2636 | ret = cmd_set_consumer_uri(session, nb_uri, uris); |
2bba9e53 DG |
2637 | if (ret != LTTNG_OK) { |
2638 | goto consumer_error; | |
2639 | } | |
2640 | session->output_traces = 1; | |
2641 | } else { | |
2642 | session->output_traces = 0; | |
2643 | DBG2("Session %s created with no output", session->name); | |
2f77fc4b DG |
2644 | } |
2645 | ||
2646 | session->consumer->enabled = 1; | |
2647 | ||
f73fabfd | 2648 | return LTTNG_OK; |
2f77fc4b DG |
2649 | |
2650 | consumer_error: | |
2651 | session_destroy(session); | |
2652 | session_error: | |
2653 | find_error: | |
2654 | return ret; | |
2655 | } | |
2656 | ||
27babd3a DG |
2657 | /* |
2658 | * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread. | |
2659 | */ | |
2660 | int cmd_create_session_snapshot(char *name, struct lttng_uri *uris, | |
2661 | size_t nb_uri, lttng_sock_cred *creds) | |
2662 | { | |
2663 | int ret; | |
2664 | struct ltt_session *session; | |
2665 | struct snapshot_output *new_output = NULL; | |
2666 | ||
2667 | assert(name); | |
2668 | assert(creds); | |
2669 | ||
2670 | /* | |
2671 | * Create session in no output mode with URIs set to NULL. The uris we've | |
2672 | * received are for a default snapshot output if one. | |
2673 | */ | |
ae58b817 | 2674 | ret = cmd_create_session_uri(name, NULL, 0, creds, 0); |
27babd3a DG |
2675 | if (ret != LTTNG_OK) { |
2676 | goto error; | |
2677 | } | |
2678 | ||
2679 | /* Get the newly created session pointer back. This should NEVER fail. */ | |
2680 | session = session_find_by_name(name); | |
2681 | assert(session); | |
2682 | ||
2683 | /* Flag session for snapshot mode. */ | |
2684 | session->snapshot_mode = 1; | |
2685 | ||
2686 | /* Skip snapshot output creation if no URI is given. */ | |
2687 | if (nb_uri == 0) { | |
2688 | goto end; | |
2689 | } | |
2690 | ||
2691 | new_output = snapshot_output_alloc(); | |
2692 | if (!new_output) { | |
2693 | ret = LTTNG_ERR_NOMEM; | |
2694 | goto error_snapshot_alloc; | |
2695 | } | |
2696 | ||
2697 | ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL, | |
2698 | uris, nb_uri, session->consumer, new_output, &session->snapshot); | |
2699 | if (ret < 0) { | |
2700 | if (ret == -ENOMEM) { | |
2701 | ret = LTTNG_ERR_NOMEM; | |
2702 | } else { | |
2703 | ret = LTTNG_ERR_INVALID; | |
2704 | } | |
2705 | goto error_snapshot; | |
2706 | } | |
2707 | ||
2708 | rcu_read_lock(); | |
2709 | snapshot_add_output(&session->snapshot, new_output); | |
2710 | rcu_read_unlock(); | |
2711 | ||
2712 | end: | |
2713 | return LTTNG_OK; | |
2714 | ||
2715 | error_snapshot: | |
2716 | snapshot_output_destroy(new_output); | |
2717 | error_snapshot_alloc: | |
2718 | session_destroy(session); | |
2719 | error: | |
2720 | return ret; | |
2721 | } | |
2722 | ||
2f77fc4b DG |
2723 | /* |
2724 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
a9ad0c8f MD |
2725 | * |
2726 | * Called with session lock held. | |
2f77fc4b DG |
2727 | */ |
2728 | int cmd_destroy_session(struct ltt_session *session, int wpipe) | |
2729 | { | |
2730 | int ret; | |
2731 | struct ltt_ust_session *usess; | |
2732 | struct ltt_kernel_session *ksess; | |
2733 | ||
2734 | /* Safety net */ | |
2735 | assert(session); | |
2736 | ||
2737 | usess = session->ust_session; | |
2738 | ksess = session->kernel_session; | |
2739 | ||
2740 | /* Clean kernel session teardown */ | |
2741 | kernel_destroy_session(ksess); | |
2742 | ||
2743 | /* UST session teardown */ | |
2744 | if (usess) { | |
2745 | /* Close any relayd session */ | |
2746 | consumer_output_send_destroy_relayd(usess->consumer); | |
2747 | ||
2748 | /* Destroy every UST application related to this session. */ | |
2749 | ret = ust_app_destroy_trace_all(usess); | |
2750 | if (ret) { | |
2751 | ERR("Error in ust_app_destroy_trace_all"); | |
2752 | } | |
2753 | ||
2754 | /* Clean up the rest. */ | |
2755 | trace_ust_destroy_session(usess); | |
2756 | } | |
2757 | ||
2758 | /* | |
2759 | * Must notify the kernel thread here to update it's poll set in order to | |
2760 | * remove the channel(s)' fd just destroyed. | |
2761 | */ | |
2762 | ret = notify_thread_pipe(wpipe); | |
2763 | if (ret < 0) { | |
2764 | PERROR("write kernel poll pipe"); | |
2765 | } | |
2766 | ||
2767 | ret = session_destroy(session); | |
2768 | ||
2769 | return ret; | |
2770 | } | |
2771 | ||
2f77fc4b DG |
2772 | /* |
2773 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
2774 | */ | |
56a37563 JG |
2775 | int cmd_register_consumer(struct ltt_session *session, |
2776 | enum lttng_domain_type domain, const char *sock_path, | |
2777 | struct consumer_data *cdata) | |
2f77fc4b DG |
2778 | { |
2779 | int ret, sock; | |
dd81b457 | 2780 | struct consumer_socket *socket = NULL; |
2f77fc4b DG |
2781 | |
2782 | assert(session); | |
2783 | assert(cdata); | |
2784 | assert(sock_path); | |
2785 | ||
2786 | switch (domain) { | |
2787 | case LTTNG_DOMAIN_KERNEL: | |
2788 | { | |
2789 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2790 | ||
2791 | assert(ksess); | |
2792 | ||
2793 | /* Can't register a consumer if there is already one */ | |
2794 | if (ksess->consumer_fds_sent != 0) { | |
f73fabfd | 2795 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
2796 | goto error; |
2797 | } | |
2798 | ||
2799 | sock = lttcomm_connect_unix_sock(sock_path); | |
2800 | if (sock < 0) { | |
f73fabfd | 2801 | ret = LTTNG_ERR_CONNECT_FAIL; |
2f77fc4b DG |
2802 | goto error; |
2803 | } | |
4ce514c4 | 2804 | cdata->cmd_sock = sock; |
2f77fc4b | 2805 | |
4ce514c4 | 2806 | socket = consumer_allocate_socket(&cdata->cmd_sock); |
2f77fc4b | 2807 | if (socket == NULL) { |
f66c074c DG |
2808 | ret = close(sock); |
2809 | if (ret < 0) { | |
2810 | PERROR("close register consumer"); | |
2811 | } | |
4ce514c4 | 2812 | cdata->cmd_sock = -1; |
f73fabfd | 2813 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2814 | goto error; |
2815 | } | |
2816 | ||
2817 | socket->lock = zmalloc(sizeof(pthread_mutex_t)); | |
2818 | if (socket->lock == NULL) { | |
2819 | PERROR("zmalloc pthread mutex"); | |
f73fabfd | 2820 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2821 | goto error; |
2822 | } | |
2823 | pthread_mutex_init(socket->lock, NULL); | |
2824 | socket->registered = 1; | |
2825 | ||
2826 | rcu_read_lock(); | |
2827 | consumer_add_socket(socket, ksess->consumer); | |
2828 | rcu_read_unlock(); | |
2829 | ||
2830 | pthread_mutex_lock(&cdata->pid_mutex); | |
2831 | cdata->pid = -1; | |
2832 | pthread_mutex_unlock(&cdata->pid_mutex); | |
2833 | ||
2834 | break; | |
2835 | } | |
2836 | default: | |
2837 | /* TODO: Userspace tracing */ | |
f73fabfd | 2838 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2839 | goto error; |
2840 | } | |
2841 | ||
dd81b457 | 2842 | return LTTNG_OK; |
2f77fc4b DG |
2843 | |
2844 | error: | |
dd81b457 DG |
2845 | if (socket) { |
2846 | consumer_destroy_socket(socket); | |
2847 | } | |
2f77fc4b DG |
2848 | return ret; |
2849 | } | |
2850 | ||
2851 | /* | |
2852 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
2853 | */ | |
2854 | ssize_t cmd_list_domains(struct ltt_session *session, | |
2855 | struct lttng_domain **domains) | |
2856 | { | |
2857 | int ret, index = 0; | |
2858 | ssize_t nb_dom = 0; | |
fefd409b DG |
2859 | struct agent *agt; |
2860 | struct lttng_ht_iter iter; | |
2f77fc4b DG |
2861 | |
2862 | if (session->kernel_session != NULL) { | |
2863 | DBG3("Listing domains found kernel domain"); | |
2864 | nb_dom++; | |
2865 | } | |
2866 | ||
2867 | if (session->ust_session != NULL) { | |
2868 | DBG3("Listing domains found UST global domain"); | |
2869 | nb_dom++; | |
3c6a091f | 2870 | |
e0a74f01 | 2871 | rcu_read_lock(); |
fefd409b DG |
2872 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2873 | agt, node.node) { | |
2874 | if (agt->being_used) { | |
2875 | nb_dom++; | |
2876 | } | |
3c6a091f | 2877 | } |
e0a74f01 | 2878 | rcu_read_unlock(); |
2f77fc4b DG |
2879 | } |
2880 | ||
fa64dfb4 JG |
2881 | if (!nb_dom) { |
2882 | goto end; | |
2883 | } | |
2884 | ||
2f77fc4b DG |
2885 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
2886 | if (*domains == NULL) { | |
f73fabfd | 2887 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2888 | goto error; |
2889 | } | |
2890 | ||
2891 | if (session->kernel_session != NULL) { | |
2892 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
b5edb9e8 PP |
2893 | |
2894 | /* Kernel session buffer type is always GLOBAL */ | |
2895 | (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL; | |
2896 | ||
2f77fc4b DG |
2897 | index++; |
2898 | } | |
2899 | ||
2900 | if (session->ust_session != NULL) { | |
2901 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
88c5f0d8 | 2902 | (*domains)[index].buf_type = session->ust_session->buffer_type; |
2f77fc4b | 2903 | index++; |
3c6a091f | 2904 | |
e0a74f01 | 2905 | rcu_read_lock(); |
fefd409b DG |
2906 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
2907 | agt, node.node) { | |
2908 | if (agt->being_used) { | |
2909 | (*domains)[index].type = agt->domain; | |
2910 | (*domains)[index].buf_type = session->ust_session->buffer_type; | |
2911 | index++; | |
2912 | } | |
3c6a091f | 2913 | } |
e0a74f01 | 2914 | rcu_read_unlock(); |
2f77fc4b | 2915 | } |
fa64dfb4 | 2916 | end: |
2f77fc4b DG |
2917 | return nb_dom; |
2918 | ||
2919 | error: | |
f73fabfd DG |
2920 | /* Return negative value to differentiate return code */ |
2921 | return -ret; | |
2f77fc4b DG |
2922 | } |
2923 | ||
2924 | ||
2925 | /* | |
2926 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
2927 | */ | |
56a37563 JG |
2928 | ssize_t cmd_list_channels(enum lttng_domain_type domain, |
2929 | struct ltt_session *session, struct lttng_channel **channels) | |
2f77fc4b | 2930 | { |
53e367f9 | 2931 | ssize_t nb_chan = 0, payload_size = 0, ret; |
2f77fc4b DG |
2932 | |
2933 | switch (domain) { | |
2934 | case LTTNG_DOMAIN_KERNEL: | |
2935 | if (session->kernel_session != NULL) { | |
2936 | nb_chan = session->kernel_session->channel_count; | |
2937 | } | |
2938 | DBG3("Number of kernel channels %zd", nb_chan); | |
c7d620a2 | 2939 | if (nb_chan <= 0) { |
53e367f9 JG |
2940 | ret = -LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2941 | goto end; | |
c7d620a2 | 2942 | } |
2f77fc4b DG |
2943 | break; |
2944 | case LTTNG_DOMAIN_UST: | |
2945 | if (session->ust_session != NULL) { | |
7ffc31a2 | 2946 | rcu_read_lock(); |
2f77fc4b | 2947 | nb_chan = lttng_ht_get_count( |
7ffc31a2 JG |
2948 | session->ust_session->domain_global.channels); |
2949 | rcu_read_unlock(); | |
2f77fc4b DG |
2950 | } |
2951 | DBG3("Number of UST global channels %zd", nb_chan); | |
ade7ce52 | 2952 | if (nb_chan < 0) { |
53e367f9 JG |
2953 | ret = -LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2954 | goto end; | |
c7d620a2 | 2955 | } |
2f77fc4b DG |
2956 | break; |
2957 | default: | |
53e367f9 JG |
2958 | ret = -LTTNG_ERR_UND; |
2959 | goto end; | |
2f77fc4b DG |
2960 | } |
2961 | ||
2962 | if (nb_chan > 0) { | |
53e367f9 | 2963 | const size_t channel_size = sizeof(struct lttng_channel) + |
cf0bcb51 JG |
2964 | sizeof(struct lttng_channel_extended); |
2965 | struct lttng_channel_extended *channel_exts; | |
53e367f9 JG |
2966 | |
2967 | payload_size = nb_chan * channel_size; | |
2968 | *channels = zmalloc(payload_size); | |
2f77fc4b | 2969 | if (*channels == NULL) { |
53e367f9 JG |
2970 | ret = -LTTNG_ERR_FATAL; |
2971 | goto end; | |
2f77fc4b DG |
2972 | } |
2973 | ||
53e367f9 JG |
2974 | channel_exts = ((void *) *channels) + |
2975 | (nb_chan * sizeof(struct lttng_channel)); | |
b958c3ad MD |
2976 | ret = list_lttng_channels(domain, session, *channels, channel_exts); |
2977 | if (ret != LTTNG_OK) { | |
2978 | free(*channels); | |
2979 | *channels = NULL; | |
2980 | goto end; | |
2981 | } | |
53e367f9 JG |
2982 | } else { |
2983 | *channels = NULL; | |
2f77fc4b DG |
2984 | } |
2985 | ||
53e367f9 JG |
2986 | ret = payload_size; |
2987 | end: | |
2988 | return ret; | |
2f77fc4b DG |
2989 | } |
2990 | ||
2991 | /* | |
2992 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
2993 | */ | |
56a37563 JG |
2994 | ssize_t cmd_list_events(enum lttng_domain_type domain, |
2995 | struct ltt_session *session, char *channel_name, | |
b4e3ceb9 | 2996 | struct lttng_event **events, size_t *total_size) |
2f77fc4b DG |
2997 | { |
2998 | int ret = 0; | |
2999 | ssize_t nb_event = 0; | |
3000 | ||
3001 | switch (domain) { | |
3002 | case LTTNG_DOMAIN_KERNEL: | |
3003 | if (session->kernel_session != NULL) { | |
3004 | nb_event = list_lttng_kernel_events(channel_name, | |
b4e3ceb9 PP |
3005 | session->kernel_session, events, |
3006 | total_size); | |
2f77fc4b DG |
3007 | } |
3008 | break; | |
3009 | case LTTNG_DOMAIN_UST: | |
3010 | { | |
3011 | if (session->ust_session != NULL) { | |
3012 | nb_event = list_lttng_ust_global_events(channel_name, | |
b4e3ceb9 PP |
3013 | &session->ust_session->domain_global, events, |
3014 | total_size); | |
2f77fc4b DG |
3015 | } |
3016 | break; | |
3017 | } | |
5cdb6027 | 3018 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 3019 | case LTTNG_DOMAIN_JUL: |
0e115563 | 3020 | case LTTNG_DOMAIN_PYTHON: |
3c6a091f | 3021 | if (session->ust_session) { |
fefd409b DG |
3022 | struct lttng_ht_iter iter; |
3023 | struct agent *agt; | |
3024 | ||
b11feea5 | 3025 | rcu_read_lock(); |
fefd409b DG |
3026 | cds_lfht_for_each_entry(session->ust_session->agents->ht, |
3027 | &iter.iter, agt, node.node) { | |
1dfd9906 JG |
3028 | if (agt->domain == domain) { |
3029 | nb_event = list_lttng_agent_events( | |
b4e3ceb9 PP |
3030 | agt, events, |
3031 | total_size); | |
1dfd9906 JG |
3032 | break; |
3033 | } | |
fefd409b | 3034 | } |
b11feea5 | 3035 | rcu_read_unlock(); |
3c6a091f DG |
3036 | } |
3037 | break; | |
2f77fc4b | 3038 | default: |
f73fabfd | 3039 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3040 | goto error; |
3041 | } | |
3042 | ||
f73fabfd | 3043 | return nb_event; |
2f77fc4b DG |
3044 | |
3045 | error: | |
f73fabfd DG |
3046 | /* Return negative value to differentiate return code */ |
3047 | return -ret; | |
2f77fc4b DG |
3048 | } |
3049 | ||
3050 | /* | |
3051 | * Using the session list, filled a lttng_session array to send back to the | |
3052 | * client for session listing. | |
3053 | * | |
3054 | * The session list lock MUST be acquired before calling this function. Use | |
3055 | * session_lock_list() and session_unlock_list(). | |
3056 | */ | |
3057 | void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid, | |
3058 | gid_t gid) | |
3059 | { | |
3060 | int ret; | |
3061 | unsigned int i = 0; | |
3062 | struct ltt_session *session; | |
3063 | struct ltt_session_list *list = session_get_list(); | |
3064 | ||
3065 | DBG("Getting all available session for UID %d GID %d", | |
3066 | uid, gid); | |
3067 | /* | |
3068 | * Iterate over session list and append data after the control struct in | |
3069 | * the buffer. | |
3070 | */ | |
3071 | cds_list_for_each_entry(session, &list->head, list) { | |
3072 | /* | |
3073 | * Only list the sessions the user can control. | |
3074 | */ | |
3075 | if (!session_access_ok(session, uid, gid)) { | |
3076 | continue; | |
3077 | } | |
3078 | ||
3079 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3080 | struct ltt_ust_session *usess = session->ust_session; | |
3081 | ||
3082 | if (session->consumer->type == CONSUMER_DST_NET || | |
3083 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
3084 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
3085 | ret = build_network_session_path(sessions[i].path, | |
dec56f6c | 3086 | sizeof(sessions[i].path), session); |
2f77fc4b | 3087 | } else { |
dec56f6c | 3088 | ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s", |
2f77fc4b DG |
3089 | session->consumer->dst.trace_path); |
3090 | } | |
3091 | if (ret < 0) { | |
3092 | PERROR("snprintf session path"); | |
3093 | continue; | |
3094 | } | |
3095 | ||
3096 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
3097 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
8382cf6f | 3098 | sessions[i].enabled = session->active; |
2cbf8fed | 3099 | sessions[i].snapshot_mode = session->snapshot_mode; |
8960e9cd | 3100 | sessions[i].live_timer_interval = session->live_timer; |
2f77fc4b DG |
3101 | i++; |
3102 | } | |
3103 | } | |
3104 | ||
806e2684 | 3105 | /* |
6d805429 | 3106 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
d3f14b8a | 3107 | * ready for trace analysis (or any kind of reader) or else 1 for pending data. |
806e2684 | 3108 | */ |
6d805429 | 3109 | int cmd_data_pending(struct ltt_session *session) |
806e2684 DG |
3110 | { |
3111 | int ret; | |
3112 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3113 | struct ltt_ust_session *usess = session->ust_session; | |
3114 | ||
3115 | assert(session); | |
3116 | ||
3117 | /* Session MUST be stopped to ask for data availability. */ | |
8382cf6f | 3118 | if (session->active) { |
806e2684 DG |
3119 | ret = LTTNG_ERR_SESSION_STARTED; |
3120 | goto error; | |
3a89d11a DG |
3121 | } else { |
3122 | /* | |
3123 | * If stopped, just make sure we've started before else the above call | |
3124 | * will always send that there is data pending. | |
3125 | * | |
3126 | * The consumer assumes that when the data pending command is received, | |
3127 | * the trace has been started before or else no output data is written | |
3128 | * by the streams which is a condition for data pending. So, this is | |
3129 | * *VERY* important that we don't ask the consumer before a start | |
3130 | * trace. | |
3131 | */ | |
8382cf6f | 3132 | if (!session->has_been_started) { |
3a89d11a DG |
3133 | ret = 0; |
3134 | goto error; | |
3135 | } | |
806e2684 DG |
3136 | } |
3137 | ||
3138 | if (ksess && ksess->consumer) { | |
6d805429 DG |
3139 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
3140 | if (ret == 1) { | |
806e2684 DG |
3141 | /* Data is still being extracted for the kernel. */ |
3142 | goto error; | |
3143 | } | |
3144 | } | |
3145 | ||
3146 | if (usess && usess->consumer) { | |
6d805429 DG |
3147 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
3148 | if (ret == 1) { | |
806e2684 DG |
3149 | /* Data is still being extracted for the kernel. */ |
3150 | goto error; | |
3151 | } | |
3152 | } | |
3153 | ||
3154 | /* Data is ready to be read by a viewer */ | |
6d805429 | 3155 | ret = 0; |
806e2684 DG |
3156 | |
3157 | error: | |
3158 | return ret; | |
3159 | } | |
3160 | ||
6dc3064a DG |
3161 | /* |
3162 | * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library. | |
3163 | * | |
3164 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3165 | */ | |
3166 | int cmd_snapshot_add_output(struct ltt_session *session, | |
3167 | struct lttng_snapshot_output *output, uint32_t *id) | |
3168 | { | |
3169 | int ret; | |
3170 | struct snapshot_output *new_output; | |
3171 | ||
3172 | assert(session); | |
3173 | assert(output); | |
3174 | ||
3175 | DBG("Cmd snapshot add output for session %s", session->name); | |
3176 | ||
3177 | /* | |
903ef685 | 3178 | * Can't create an output if the session is not set in no-output mode. |
6dc3064a DG |
3179 | */ |
3180 | if (session->output_traces) { | |
903ef685 | 3181 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3182 | goto error; |
3183 | } | |
3184 | ||
3185 | /* Only one output is allowed until we have the "tee" feature. */ | |
3186 | if (session->snapshot.nb_output == 1) { | |
3187 | ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST; | |
3188 | goto error; | |
3189 | } | |
3190 | ||
3191 | new_output = snapshot_output_alloc(); | |
3192 | if (!new_output) { | |
3193 | ret = LTTNG_ERR_NOMEM; | |
3194 | goto error; | |
3195 | } | |
3196 | ||
3197 | ret = snapshot_output_init(output->max_size, output->name, | |
3198 | output->ctrl_url, output->data_url, session->consumer, new_output, | |
3199 | &session->snapshot); | |
3200 | if (ret < 0) { | |
3201 | if (ret == -ENOMEM) { | |
3202 | ret = LTTNG_ERR_NOMEM; | |
3203 | } else { | |
3204 | ret = LTTNG_ERR_INVALID; | |
3205 | } | |
3206 | goto free_error; | |
3207 | } | |
3208 | ||
6dc3064a DG |
3209 | rcu_read_lock(); |
3210 | snapshot_add_output(&session->snapshot, new_output); | |
3211 | if (id) { | |
3212 | *id = new_output->id; | |
3213 | } | |
3214 | rcu_read_unlock(); | |
3215 | ||
3216 | return LTTNG_OK; | |
3217 | ||
3218 | free_error: | |
3219 | snapshot_output_destroy(new_output); | |
3220 | error: | |
3221 | return ret; | |
3222 | } | |
3223 | ||
3224 | /* | |
3225 | * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl. | |
3226 | * | |
3227 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3228 | */ | |
3229 | int cmd_snapshot_del_output(struct ltt_session *session, | |
3230 | struct lttng_snapshot_output *output) | |
3231 | { | |
3232 | int ret; | |
eb240553 | 3233 | struct snapshot_output *sout = NULL; |
6dc3064a DG |
3234 | |
3235 | assert(session); | |
3236 | assert(output); | |
3237 | ||
6dc3064a DG |
3238 | rcu_read_lock(); |
3239 | ||
3240 | /* | |
d3f14b8a MD |
3241 | * Permission denied to create an output if the session is not |
3242 | * set in no output mode. | |
6dc3064a DG |
3243 | */ |
3244 | if (session->output_traces) { | |
903ef685 | 3245 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3246 | goto error; |
3247 | } | |
3248 | ||
eb240553 DG |
3249 | if (output->id) { |
3250 | DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id, | |
3251 | session->name); | |
3252 | sout = snapshot_find_output_by_id(output->id, &session->snapshot); | |
3253 | } else if (*output->name != '\0') { | |
3254 | DBG("Cmd snapshot del output name %s for session %s", output->name, | |
3255 | session->name); | |
3256 | sout = snapshot_find_output_by_name(output->name, &session->snapshot); | |
3257 | } | |
6dc3064a DG |
3258 | if (!sout) { |
3259 | ret = LTTNG_ERR_INVALID; | |
3260 | goto error; | |
3261 | } | |
3262 | ||
3263 | snapshot_delete_output(&session->snapshot, sout); | |
3264 | snapshot_output_destroy(sout); | |
3265 | ret = LTTNG_OK; | |
3266 | ||
3267 | error: | |
3268 | rcu_read_unlock(); | |
3269 | return ret; | |
3270 | } | |
3271 | ||
3272 | /* | |
3273 | * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl. | |
3274 | * | |
3275 | * If no output is available, outputs is untouched and 0 is returned. | |
3276 | * | |
3277 | * Return the size of the newly allocated outputs or a negative LTTNG_ERR code. | |
3278 | */ | |
3279 | ssize_t cmd_snapshot_list_outputs(struct ltt_session *session, | |
3280 | struct lttng_snapshot_output **outputs) | |
3281 | { | |
3282 | int ret, idx = 0; | |
b223ca94 | 3283 | struct lttng_snapshot_output *list = NULL; |
6dc3064a DG |
3284 | struct lttng_ht_iter iter; |
3285 | struct snapshot_output *output; | |
3286 | ||
3287 | assert(session); | |
3288 | assert(outputs); | |
3289 | ||
3290 | DBG("Cmd snapshot list outputs for session %s", session->name); | |
3291 | ||
3292 | /* | |
d3f14b8a MD |
3293 | * Permission denied to create an output if the session is not |
3294 | * set in no output mode. | |
6dc3064a DG |
3295 | */ |
3296 | if (session->output_traces) { | |
903ef685 JG |
3297 | ret = -LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
3298 | goto end; | |
6dc3064a DG |
3299 | } |
3300 | ||
3301 | if (session->snapshot.nb_output == 0) { | |
3302 | ret = 0; | |
903ef685 | 3303 | goto end; |
6dc3064a DG |
3304 | } |
3305 | ||
3306 | list = zmalloc(session->snapshot.nb_output * sizeof(*list)); | |
3307 | if (!list) { | |
b223ca94 | 3308 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3309 | goto end; |
6dc3064a DG |
3310 | } |
3311 | ||
3312 | /* Copy list from session to the new list object. */ | |
b223ca94 | 3313 | rcu_read_lock(); |
6dc3064a DG |
3314 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter, |
3315 | output, node.node) { | |
3316 | assert(output->consumer); | |
3317 | list[idx].id = output->id; | |
3318 | list[idx].max_size = output->max_size; | |
6ce22875 MD |
3319 | if (lttng_strncpy(list[idx].name, output->name, |
3320 | sizeof(list[idx].name))) { | |
3321 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 3322 | goto error; |
6ce22875 | 3323 | } |
6dc3064a | 3324 | if (output->consumer->type == CONSUMER_DST_LOCAL) { |
6ce22875 MD |
3325 | if (lttng_strncpy(list[idx].ctrl_url, |
3326 | output->consumer->dst.trace_path, | |
3327 | sizeof(list[idx].ctrl_url))) { | |
3328 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 3329 | goto error; |
6ce22875 | 3330 | } |
6dc3064a DG |
3331 | } else { |
3332 | /* Control URI. */ | |
3333 | ret = uri_to_str_url(&output->consumer->dst.net.control, | |
3334 | list[idx].ctrl_url, sizeof(list[idx].ctrl_url)); | |
3335 | if (ret < 0) { | |
b223ca94 | 3336 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3337 | goto error; |
6dc3064a DG |
3338 | } |
3339 | ||
3340 | /* Data URI. */ | |
3341 | ret = uri_to_str_url(&output->consumer->dst.net.data, | |
3342 | list[idx].data_url, sizeof(list[idx].data_url)); | |
3343 | if (ret < 0) { | |
b223ca94 | 3344 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3345 | goto error; |
6dc3064a DG |
3346 | } |
3347 | } | |
3348 | idx++; | |
3349 | } | |
3350 | ||
3351 | *outputs = list; | |
b223ca94 JG |
3352 | list = NULL; |
3353 | ret = session->snapshot.nb_output; | |
6dc3064a | 3354 | error: |
903ef685 | 3355 | rcu_read_unlock(); |
b223ca94 | 3356 | free(list); |
903ef685 | 3357 | end: |
b223ca94 | 3358 | return ret; |
6dc3064a DG |
3359 | } |
3360 | ||
93ec662e JD |
3361 | /* |
3362 | * Check if we can regenerate the metadata for this session. | |
3363 | * Only kernel, UST per-uid and non-live sessions are supported. | |
3364 | * | |
3365 | * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise. | |
3366 | */ | |
3367 | static | |
eded6438 | 3368 | int check_regenerate_metadata_support(struct ltt_session *session) |
93ec662e JD |
3369 | { |
3370 | int ret; | |
3371 | ||
3372 | assert(session); | |
3373 | ||
3374 | if (session->live_timer != 0) { | |
3375 | ret = LTTNG_ERR_LIVE_SESSION; | |
3376 | goto end; | |
3377 | } | |
3378 | if (!session->active) { | |
3379 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
3380 | goto end; | |
3381 | } | |
3382 | if (session->ust_session) { | |
3383 | switch (session->ust_session->buffer_type) { | |
3384 | case LTTNG_BUFFER_PER_UID: | |
3385 | break; | |
3386 | case LTTNG_BUFFER_PER_PID: | |
3387 | ret = LTTNG_ERR_PER_PID_SESSION; | |
3388 | goto end; | |
3389 | default: | |
3390 | assert(0); | |
3391 | ret = LTTNG_ERR_UNK; | |
3392 | goto end; | |
3393 | } | |
3394 | } | |
3395 | if (session->consumer->type == CONSUMER_DST_NET && | |
3396 | session->consumer->relay_minor_version < 8) { | |
3397 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; | |
3398 | goto end; | |
3399 | } | |
3400 | ret = 0; | |
3401 | ||
3402 | end: | |
3403 | return ret; | |
3404 | } | |
3405 | ||
7802bae3 LL |
3406 | static |
3407 | int clear_metadata_file(int fd) | |
3408 | { | |
3409 | int ret; | |
3410 | ||
3411 | ret = lseek(fd, 0, SEEK_SET); | |
3412 | if (ret < 0) { | |
3413 | PERROR("lseek"); | |
3414 | goto end; | |
3415 | } | |
3416 | ||
3417 | ret = ftruncate(fd, 0); | |
3418 | if (ret < 0) { | |
3419 | PERROR("ftruncate"); | |
3420 | goto end; | |
3421 | } | |
3422 | ||
3423 | end: | |
3424 | return ret; | |
3425 | } | |
3426 | ||
93ec662e | 3427 | static |
eded6438 | 3428 | int ust_regenerate_metadata(struct ltt_ust_session *usess) |
93ec662e JD |
3429 | { |
3430 | int ret = 0; | |
3431 | struct buffer_reg_uid *uid_reg = NULL; | |
3432 | struct buffer_reg_session *session_reg = NULL; | |
3433 | ||
3434 | rcu_read_lock(); | |
3435 | cds_list_for_each_entry(uid_reg, &usess->buffer_reg_uid_list, lnode) { | |
3436 | struct ust_registry_session *registry; | |
3437 | struct ust_registry_channel *chan; | |
3438 | struct lttng_ht_iter iter_chan; | |
3439 | ||
3440 | session_reg = uid_reg->registry; | |
3441 | registry = session_reg->reg.ust; | |
3442 | ||
3443 | pthread_mutex_lock(®istry->lock); | |
3444 | registry->metadata_len_sent = 0; | |
3445 | memset(registry->metadata, 0, registry->metadata_alloc_len); | |
3446 | registry->metadata_len = 0; | |
3447 | registry->metadata_version++; | |
7802bae3 LL |
3448 | if (registry->metadata_fd > 0) { |
3449 | /* Clear the metadata file's content. */ | |
3450 | ret = clear_metadata_file(registry->metadata_fd); | |
3451 | if (ret) { | |
3452 | pthread_mutex_unlock(®istry->lock); | |
3453 | goto end; | |
3454 | } | |
3455 | } | |
3456 | ||
93ec662e JD |
3457 | ret = ust_metadata_session_statedump(registry, NULL, |
3458 | registry->major, registry->minor); | |
3459 | if (ret) { | |
3460 | pthread_mutex_unlock(®istry->lock); | |
3461 | ERR("Failed to generate session metadata (err = %d)", | |
3462 | ret); | |
3463 | goto end; | |
3464 | } | |
3465 | cds_lfht_for_each_entry(registry->channels->ht, &iter_chan.iter, | |
3466 | chan, node.node) { | |
3467 | struct ust_registry_event *event; | |
3468 | struct lttng_ht_iter iter_event; | |
3469 | ||
3470 | ret = ust_metadata_channel_statedump(registry, chan); | |
3471 | if (ret) { | |
3472 | pthread_mutex_unlock(®istry->lock); | |
3473 | ERR("Failed to generate channel metadata " | |
3474 | "(err = %d)", ret); | |
3475 | goto end; | |
3476 | } | |
3477 | cds_lfht_for_each_entry(chan->ht->ht, &iter_event.iter, | |
3478 | event, node.node) { | |
3479 | ret = ust_metadata_event_statedump(registry, | |
3480 | chan, event); | |
3481 | if (ret) { | |
3482 | pthread_mutex_unlock(®istry->lock); | |
3483 | ERR("Failed to generate event metadata " | |
3484 | "(err = %d)", ret); | |
3485 | goto end; | |
3486 | } | |
3487 | } | |
3488 | } | |
3489 | pthread_mutex_unlock(®istry->lock); | |
3490 | } | |
3491 | ||
3492 | end: | |
3493 | rcu_read_unlock(); | |
3494 | return ret; | |
3495 | } | |
3496 | ||
3497 | /* | |
eded6438 | 3498 | * Command LTTNG_REGENERATE_METADATA from the lttng-ctl library. |
93ec662e JD |
3499 | * |
3500 | * Ask the consumer to truncate the existing metadata file(s) and | |
3501 | * then regenerate the metadata. Live and per-pid sessions are not | |
3502 | * supported and return an error. | |
3503 | * | |
3504 | * Return 0 on success or else a LTTNG_ERR code. | |
3505 | */ | |
eded6438 | 3506 | int cmd_regenerate_metadata(struct ltt_session *session) |
93ec662e JD |
3507 | { |
3508 | int ret; | |
3509 | ||
3510 | assert(session); | |
3511 | ||
eded6438 | 3512 | ret = check_regenerate_metadata_support(session); |
93ec662e JD |
3513 | if (ret) { |
3514 | goto end; | |
3515 | } | |
3516 | ||
3517 | if (session->kernel_session) { | |
eded6438 | 3518 | ret = kernctl_session_regenerate_metadata( |
93ec662e JD |
3519 | session->kernel_session->fd); |
3520 | if (ret < 0) { | |
3521 | ERR("Failed to regenerate the kernel metadata"); | |
3522 | goto end; | |
3523 | } | |
3524 | } | |
3525 | ||
3526 | if (session->ust_session) { | |
eded6438 | 3527 | ret = ust_regenerate_metadata(session->ust_session); |
93ec662e JD |
3528 | if (ret < 0) { |
3529 | ERR("Failed to regenerate the UST metadata"); | |
3530 | goto end; | |
3531 | } | |
3532 | } | |
3533 | DBG("Cmd metadata regenerate for session %s", session->name); | |
3534 | ret = LTTNG_OK; | |
3535 | ||
3536 | end: | |
3537 | return ret; | |
3538 | } | |
3539 | ||
c2561365 JD |
3540 | /* |
3541 | * Command LTTNG_REGENERATE_STATEDUMP from the lttng-ctl library. | |
3542 | * | |
3543 | * Ask the tracer to regenerate a new statedump. | |
3544 | * | |
3545 | * Return 0 on success or else a LTTNG_ERR code. | |
3546 | */ | |
3547 | int cmd_regenerate_statedump(struct ltt_session *session) | |
3548 | { | |
3549 | int ret; | |
3550 | ||
3551 | assert(session); | |
3552 | ||
3553 | if (!session->active) { | |
3554 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
3555 | goto end; | |
3556 | } | |
c2561365 JD |
3557 | |
3558 | if (session->kernel_session) { | |
3559 | ret = kernctl_session_regenerate_statedump( | |
3560 | session->kernel_session->fd); | |
3561 | /* | |
3562 | * Currently, the statedump in kernel can only fail if out | |
3563 | * of memory. | |
3564 | */ | |
3565 | if (ret < 0) { | |
3566 | if (ret == -ENOMEM) { | |
3567 | ret = LTTNG_ERR_REGEN_STATEDUMP_NOMEM; | |
3568 | } else { | |
3569 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
3570 | } | |
3571 | ERR("Failed to regenerate the kernel statedump"); | |
3572 | goto end; | |
3573 | } | |
3574 | } | |
3575 | ||
3576 | if (session->ust_session) { | |
3577 | ret = ust_app_regenerate_statedump_all(session->ust_session); | |
3578 | /* | |
3579 | * Currently, the statedump in UST always returns 0. | |
3580 | */ | |
3581 | if (ret < 0) { | |
3582 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
3583 | ERR("Failed to regenerate the UST statedump"); | |
3584 | goto end; | |
3585 | } | |
3586 | } | |
3587 | DBG("Cmd regenerate statedump for session %s", session->name); | |
3588 | ret = LTTNG_OK; | |
3589 | ||
3590 | end: | |
3591 | return ret; | |
3592 | } | |
3593 | ||
b0880ae5 JG |
3594 | int cmd_register_trigger(struct command_ctx *cmd_ctx, int sock, |
3595 | struct notification_thread_handle *notification_thread) | |
3596 | { | |
3597 | int ret; | |
3598 | size_t trigger_len; | |
3599 | ssize_t sock_recv_len; | |
3600 | struct lttng_trigger *trigger = NULL; | |
3601 | struct lttng_buffer_view view; | |
3602 | struct lttng_dynamic_buffer trigger_buffer; | |
3603 | ||
3604 | lttng_dynamic_buffer_init(&trigger_buffer); | |
3605 | trigger_len = (size_t) cmd_ctx->lsm->u.trigger.length; | |
3606 | ret = lttng_dynamic_buffer_set_size(&trigger_buffer, trigger_len); | |
3607 | if (ret) { | |
3608 | ret = LTTNG_ERR_NOMEM; | |
3609 | goto end; | |
3610 | } | |
3611 | ||
3612 | sock_recv_len = lttcomm_recv_unix_sock(sock, trigger_buffer.data, | |
3613 | trigger_len); | |
3614 | if (sock_recv_len < 0 || sock_recv_len != trigger_len) { | |
3615 | ERR("Failed to receive \"register trigger\" command payload"); | |
3616 | /* TODO: should this be a new error enum ? */ | |
3617 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
3618 | goto end; | |
3619 | } | |
3620 | ||
3621 | view = lttng_buffer_view_from_dynamic_buffer(&trigger_buffer, 0, -1); | |
3622 | if (lttng_trigger_create_from_buffer(&view, &trigger) != | |
3623 | trigger_len) { | |
3624 | ERR("Invalid trigger payload received in \"register trigger\" command"); | |
3625 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
3626 | goto end; | |
3627 | } | |
3628 | ||
3629 | ret = notification_thread_command_register_trigger(notification_thread, | |
3630 | trigger); | |
090c2982 JG |
3631 | /* Ownership of trigger was transferred. */ |
3632 | trigger = NULL; | |
b0880ae5 | 3633 | end: |
090c2982 | 3634 | lttng_trigger_destroy(trigger); |
b0880ae5 JG |
3635 | lttng_dynamic_buffer_reset(&trigger_buffer); |
3636 | return ret; | |
3637 | } | |
3638 | ||
3639 | int cmd_unregister_trigger(struct command_ctx *cmd_ctx, int sock, | |
3640 | struct notification_thread_handle *notification_thread) | |
3641 | { | |
3642 | int ret; | |
3643 | size_t trigger_len; | |
3644 | ssize_t sock_recv_len; | |
3645 | struct lttng_trigger *trigger = NULL; | |
3646 | struct lttng_buffer_view view; | |
3647 | struct lttng_dynamic_buffer trigger_buffer; | |
3648 | ||
3649 | lttng_dynamic_buffer_init(&trigger_buffer); | |
3650 | trigger_len = (size_t) cmd_ctx->lsm->u.trigger.length; | |
3651 | ret = lttng_dynamic_buffer_set_size(&trigger_buffer, trigger_len); | |
3652 | if (ret) { | |
3653 | ret = LTTNG_ERR_NOMEM; | |
3654 | goto end; | |
3655 | } | |
3656 | ||
3657 | sock_recv_len = lttcomm_recv_unix_sock(sock, trigger_buffer.data, | |
3658 | trigger_len); | |
3659 | if (sock_recv_len < 0 || sock_recv_len != trigger_len) { | |
3660 | ERR("Failed to receive \"unregister trigger\" command payload"); | |
3661 | /* TODO: should this be a new error enum ? */ | |
3662 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
3663 | goto end; | |
3664 | } | |
3665 | ||
3666 | view = lttng_buffer_view_from_dynamic_buffer(&trigger_buffer, 0, -1); | |
3667 | if (lttng_trigger_create_from_buffer(&view, &trigger) != | |
3668 | trigger_len) { | |
3669 | ERR("Invalid trigger payload received in \"unregister trigger\" command"); | |
3670 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
3671 | goto end; | |
3672 | } | |
3673 | ||
3674 | ret = notification_thread_command_unregister_trigger(notification_thread, | |
3675 | trigger); | |
3676 | end: | |
090c2982 | 3677 | lttng_trigger_destroy(trigger); |
b0880ae5 JG |
3678 | lttng_dynamic_buffer_reset(&trigger_buffer); |
3679 | return ret; | |
3680 | } | |
3681 | ||
6dc3064a DG |
3682 | /* |
3683 | * Send relayd sockets from snapshot output to consumer. Ignore request if the | |
3684 | * snapshot output is *not* set with a remote destination. | |
3685 | * | |
a934f4af | 3686 | * Return 0 on success or a LTTNG_ERR code. |
6dc3064a DG |
3687 | */ |
3688 | static int set_relayd_for_snapshot(struct consumer_output *consumer, | |
3689 | struct snapshot_output *snap_output, struct ltt_session *session) | |
3690 | { | |
a934f4af | 3691 | int ret = LTTNG_OK; |
6dc3064a DG |
3692 | struct lttng_ht_iter iter; |
3693 | struct consumer_socket *socket; | |
3694 | ||
3695 | assert(consumer); | |
3696 | assert(snap_output); | |
3697 | assert(session); | |
3698 | ||
3699 | DBG2("Set relayd object from snapshot output"); | |
3700 | ||
3701 | /* Ignore if snapshot consumer output is not network. */ | |
3702 | if (snap_output->consumer->type != CONSUMER_DST_NET) { | |
3703 | goto error; | |
3704 | } | |
3705 | ||
3706 | /* | |
3707 | * For each consumer socket, create and send the relayd object of the | |
3708 | * snapshot output. | |
3709 | */ | |
3710 | rcu_read_lock(); | |
5eecee74 DG |
3711 | cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter, |
3712 | socket, node.node) { | |
14c6c441 | 3713 | pthread_mutex_lock(socket->lock); |
6dc3064a | 3714 | ret = send_consumer_relayd_sockets(0, session->id, |
d3e2ba59 JD |
3715 | snap_output->consumer, socket, |
3716 | session->name, session->hostname, | |
3717 | session->live_timer); | |
14c6c441 | 3718 | pthread_mutex_unlock(socket->lock); |
a934f4af | 3719 | if (ret != LTTNG_OK) { |
6dc3064a DG |
3720 | rcu_read_unlock(); |
3721 | goto error; | |
3722 | } | |
3723 | } | |
3724 | rcu_read_unlock(); | |
3725 | ||
3726 | error: | |
3727 | return ret; | |
3728 | } | |
3729 | ||
3730 | /* | |
3731 | * Record a kernel snapshot. | |
3732 | * | |
fac41e72 | 3733 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a DG |
3734 | */ |
3735 | static int record_kernel_snapshot(struct ltt_kernel_session *ksess, | |
5c786ded | 3736 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3737 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3738 | { |
3739 | int ret; | |
3740 | ||
3741 | assert(ksess); | |
3742 | assert(output); | |
3743 | assert(session); | |
3744 | ||
10a50311 | 3745 | |
af706bb7 DG |
3746 | /* |
3747 | * Copy kernel session sockets so we can communicate with the right | |
3748 | * consumer for the snapshot record command. | |
3749 | */ | |
3750 | ret = consumer_copy_sockets(output->consumer, ksess->consumer); | |
3751 | if (ret < 0) { | |
a934f4af | 3752 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3753 | goto error; |
6dc3064a DG |
3754 | } |
3755 | ||
3756 | ret = set_relayd_for_snapshot(ksess->consumer, output, session); | |
a934f4af | 3757 | if (ret != LTTNG_OK) { |
af706bb7 | 3758 | goto error_snapshot; |
6dc3064a DG |
3759 | } |
3760 | ||
d07ceecd | 3761 | ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream); |
2a06df8d | 3762 | if (ret != LTTNG_OK) { |
af706bb7 | 3763 | goto error_snapshot; |
6dc3064a DG |
3764 | } |
3765 | ||
a934f4af | 3766 | ret = LTTNG_OK; |
1371fc12 | 3767 | goto end; |
a934f4af | 3768 | |
af706bb7 DG |
3769 | error_snapshot: |
3770 | /* Clean up copied sockets so this output can use some other later on. */ | |
3771 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a | 3772 | error: |
1371fc12 | 3773 | end: |
6dc3064a DG |
3774 | return ret; |
3775 | } | |
3776 | ||
3777 | /* | |
3778 | * Record a UST snapshot. | |
3779 | * | |
a934f4af | 3780 | * Return 0 on success or a LTTNG_ERR error code. |
6dc3064a DG |
3781 | */ |
3782 | static int record_ust_snapshot(struct ltt_ust_session *usess, | |
5c786ded | 3783 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 3784 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
3785 | { |
3786 | int ret; | |
3787 | ||
3788 | assert(usess); | |
3789 | assert(output); | |
3790 | assert(session); | |
3791 | ||
af706bb7 | 3792 | /* |
d3f14b8a | 3793 | * Copy UST session sockets so we can communicate with the right |
af706bb7 DG |
3794 | * consumer for the snapshot record command. |
3795 | */ | |
3796 | ret = consumer_copy_sockets(output->consumer, usess->consumer); | |
3797 | if (ret < 0) { | |
a934f4af | 3798 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 3799 | goto error; |
6dc3064a DG |
3800 | } |
3801 | ||
3802 | ret = set_relayd_for_snapshot(usess->consumer, output, session); | |
a934f4af | 3803 | if (ret != LTTNG_OK) { |
af706bb7 | 3804 | goto error_snapshot; |
6dc3064a DG |
3805 | } |
3806 | ||
d07ceecd | 3807 | ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream); |
6dc3064a | 3808 | if (ret < 0) { |
7badf927 DG |
3809 | switch (-ret) { |
3810 | case EINVAL: | |
a934f4af | 3811 | ret = LTTNG_ERR_INVALID; |
7badf927 | 3812 | break; |
7badf927 DG |
3813 | default: |
3814 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
3815 | break; | |
5c786ded | 3816 | } |
af706bb7 | 3817 | goto error_snapshot; |
6dc3064a DG |
3818 | } |
3819 | ||
a934f4af DG |
3820 | ret = LTTNG_OK; |
3821 | ||
af706bb7 DG |
3822 | error_snapshot: |
3823 | /* Clean up copied sockets so this output can use some other later on. */ | |
3824 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a DG |
3825 | error: |
3826 | return ret; | |
3827 | } | |
3828 | ||
d07ceecd MD |
3829 | static |
3830 | uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session, | |
3831 | uint64_t cur_nr_packets) | |
68808f4e | 3832 | { |
d07ceecd | 3833 | uint64_t tot_size = 0; |
68808f4e DG |
3834 | |
3835 | if (session->kernel_session) { | |
3836 | struct ltt_kernel_channel *chan; | |
3837 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3838 | ||
68808f4e | 3839 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
d07ceecd MD |
3840 | if (cur_nr_packets >= chan->channel->attr.num_subbuf) { |
3841 | /* | |
3842 | * Don't take channel into account if we | |
3843 | * already grab all its packets. | |
3844 | */ | |
3845 | continue; | |
68808f4e | 3846 | } |
d07ceecd MD |
3847 | tot_size += chan->channel->attr.subbuf_size |
3848 | * chan->stream_count; | |
68808f4e DG |
3849 | } |
3850 | } | |
3851 | ||
3852 | if (session->ust_session) { | |
68808f4e DG |
3853 | struct ltt_ust_session *usess = session->ust_session; |
3854 | ||
d07ceecd MD |
3855 | tot_size += ust_app_get_size_one_more_packet_per_stream(usess, |
3856 | cur_nr_packets); | |
68808f4e DG |
3857 | } |
3858 | ||
d07ceecd | 3859 | return tot_size; |
68808f4e DG |
3860 | } |
3861 | ||
5c786ded | 3862 | /* |
d07ceecd MD |
3863 | * Calculate the number of packets we can grab from each stream that |
3864 | * fits within the overall snapshot max size. | |
3865 | * | |
3866 | * Returns -1 on error, 0 means infinite number of packets, else > 0 is | |
3867 | * the number of packets per stream. | |
3868 | * | |
3869 | * TODO: this approach is not perfect: we consider the worse case | |
3870 | * (packet filling the sub-buffers) as an upper bound, but we could do | |
3871 | * better if we do this calculation while we actually grab the packet | |
3872 | * content: we would know how much padding we don't actually store into | |
3873 | * the file. | |
3874 | * | |
3875 | * This algorithm is currently bounded by the number of packets per | |
3876 | * stream. | |
3877 | * | |
3878 | * Since we call this algorithm before actually grabbing the data, it's | |
3879 | * an approximation: for instance, applications could appear/disappear | |
3880 | * in between this call and actually grabbing data. | |
5c786ded | 3881 | */ |
d07ceecd MD |
3882 | static |
3883 | int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size) | |
5c786ded | 3884 | { |
d07ceecd MD |
3885 | int64_t size_left; |
3886 | uint64_t cur_nb_packets = 0; | |
5c786ded | 3887 | |
d07ceecd MD |
3888 | if (!max_size) { |
3889 | return 0; /* Infinite */ | |
5c786ded JD |
3890 | } |
3891 | ||
d07ceecd MD |
3892 | size_left = max_size; |
3893 | for (;;) { | |
3894 | uint64_t one_more_packet_tot_size; | |
5c786ded | 3895 | |
d07ceecd MD |
3896 | one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session, |
3897 | cur_nb_packets); | |
3898 | if (!one_more_packet_tot_size) { | |
3899 | /* We are already grabbing all packets. */ | |
3900 | break; | |
3901 | } | |
3902 | size_left -= one_more_packet_tot_size; | |
3903 | if (size_left < 0) { | |
3904 | break; | |
3905 | } | |
3906 | cur_nb_packets++; | |
5c786ded | 3907 | } |
d07ceecd MD |
3908 | if (!cur_nb_packets) { |
3909 | /* Not enough room to grab one packet of each stream, error. */ | |
3910 | return -1; | |
3911 | } | |
3912 | return cur_nb_packets; | |
5c786ded JD |
3913 | } |
3914 | ||
6dc3064a DG |
3915 | /* |
3916 | * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl. | |
3917 | * | |
3918 | * The wait parameter is ignored so this call always wait for the snapshot to | |
3919 | * complete before returning. | |
3920 | * | |
3921 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3922 | */ | |
3923 | int cmd_snapshot_record(struct ltt_session *session, | |
3924 | struct lttng_snapshot_output *output, int wait) | |
3925 | { | |
3926 | int ret = LTTNG_OK; | |
e1986656 DG |
3927 | unsigned int use_tmp_output = 0; |
3928 | struct snapshot_output tmp_output; | |
00e1dfc4 | 3929 | unsigned int snapshot_success = 0; |
10ba83fe | 3930 | char datetime[16]; |
6dc3064a DG |
3931 | |
3932 | assert(session); | |
ba45d9f0 | 3933 | assert(output); |
6dc3064a DG |
3934 | |
3935 | DBG("Cmd snapshot record for session %s", session->name); | |
3936 | ||
10ba83fe JR |
3937 | /* Get the datetime for the snapshot output directory. */ |
3938 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", datetime, | |
3939 | sizeof(datetime)); | |
3940 | if (!ret) { | |
3941 | ret = LTTNG_ERR_INVALID; | |
3942 | goto error; | |
3943 | } | |
3944 | ||
6dc3064a | 3945 | /* |
d3f14b8a MD |
3946 | * Permission denied to create an output if the session is not |
3947 | * set in no output mode. | |
6dc3064a DG |
3948 | */ |
3949 | if (session->output_traces) { | |
903ef685 | 3950 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3951 | goto error; |
3952 | } | |
3953 | ||
3954 | /* The session needs to be started at least once. */ | |
8382cf6f | 3955 | if (!session->has_been_started) { |
6dc3064a DG |
3956 | ret = LTTNG_ERR_START_SESSION_ONCE; |
3957 | goto error; | |
3958 | } | |
3959 | ||
3960 | /* Use temporary output for the session. */ | |
ba45d9f0 | 3961 | if (*output->ctrl_url != '\0') { |
6dc3064a DG |
3962 | ret = snapshot_output_init(output->max_size, output->name, |
3963 | output->ctrl_url, output->data_url, session->consumer, | |
e1986656 | 3964 | &tmp_output, NULL); |
6dc3064a DG |
3965 | if (ret < 0) { |
3966 | if (ret == -ENOMEM) { | |
3967 | ret = LTTNG_ERR_NOMEM; | |
3968 | } else { | |
3969 | ret = LTTNG_ERR_INVALID; | |
3970 | } | |
3971 | goto error; | |
3972 | } | |
1bfe7328 DG |
3973 | /* Use the global session count for the temporary snapshot. */ |
3974 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; | |
10ba83fe JR |
3975 | |
3976 | /* Use the global datetime */ | |
3977 | memcpy(tmp_output.datetime, datetime, sizeof(datetime)); | |
e1986656 | 3978 | use_tmp_output = 1; |
6dc3064a DG |
3979 | } |
3980 | ||
804c90a8 JR |
3981 | if (use_tmp_output) { |
3982 | int64_t nb_packets_per_stream; | |
6dc3064a | 3983 | |
804c90a8 JR |
3984 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, |
3985 | tmp_output.max_size); | |
3986 | if (nb_packets_per_stream < 0) { | |
3987 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
3988 | goto error; | |
3989 | } | |
d07ceecd | 3990 | |
804c90a8 JR |
3991 | if (session->kernel_session) { |
3992 | ret = record_kernel_snapshot(session->kernel_session, | |
3993 | &tmp_output, session, | |
3994 | wait, nb_packets_per_stream); | |
3995 | if (ret != LTTNG_OK) { | |
d07ceecd MD |
3996 | goto error; |
3997 | } | |
804c90a8 JR |
3998 | } |
3999 | ||
4000 | if (session->ust_session) { | |
4001 | ret = record_ust_snapshot(session->ust_session, | |
4002 | &tmp_output, session, | |
d07ceecd | 4003 | wait, nb_packets_per_stream); |
a934f4af | 4004 | if (ret != LTTNG_OK) { |
6dc3064a DG |
4005 | goto error; |
4006 | } | |
804c90a8 | 4007 | } |
e1986656 | 4008 | |
804c90a8 JR |
4009 | snapshot_success = 1; |
4010 | } else { | |
4011 | struct snapshot_output *sout; | |
4012 | struct lttng_ht_iter iter; | |
68808f4e | 4013 | |
804c90a8 JR |
4014 | rcu_read_lock(); |
4015 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
4016 | &iter.iter, sout, node.node) { | |
4017 | int64_t nb_packets_per_stream; | |
e1986656 | 4018 | |
804c90a8 JR |
4019 | /* |
4020 | * Make a local copy of the output and assign the possible | |
4021 | * temporary value given by the caller. | |
4022 | */ | |
4023 | memset(&tmp_output, 0, sizeof(tmp_output)); | |
4024 | memcpy(&tmp_output, sout, sizeof(tmp_output)); | |
1bfe7328 | 4025 | |
804c90a8 JR |
4026 | if (output->max_size != (uint64_t) -1ULL) { |
4027 | tmp_output.max_size = output->max_size; | |
6dc3064a | 4028 | } |
d07ceecd MD |
4029 | |
4030 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
4031 | tmp_output.max_size); | |
4032 | if (nb_packets_per_stream < 0) { | |
4033 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
804c90a8 | 4034 | rcu_read_unlock(); |
d07ceecd MD |
4035 | goto error; |
4036 | } | |
6dc3064a | 4037 | |
804c90a8 JR |
4038 | /* Use temporary name. */ |
4039 | if (*output->name != '\0') { | |
cf3e357d MD |
4040 | if (lttng_strncpy(tmp_output.name, output->name, |
4041 | sizeof(tmp_output.name))) { | |
4042 | ret = LTTNG_ERR_INVALID; | |
4043 | rcu_read_unlock(); | |
4044 | goto error; | |
4045 | } | |
804c90a8 | 4046 | } |
e1986656 | 4047 | |
804c90a8 | 4048 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; |
10ba83fe | 4049 | memcpy(tmp_output.datetime, datetime, sizeof(datetime)); |
e1986656 | 4050 | |
804c90a8 JR |
4051 | if (session->kernel_session) { |
4052 | ret = record_kernel_snapshot(session->kernel_session, | |
4053 | &tmp_output, session, | |
4054 | wait, nb_packets_per_stream); | |
4055 | if (ret != LTTNG_OK) { | |
d07ceecd | 4056 | rcu_read_unlock(); |
68808f4e DG |
4057 | goto error; |
4058 | } | |
804c90a8 | 4059 | } |
68808f4e | 4060 | |
804c90a8 JR |
4061 | if (session->ust_session) { |
4062 | ret = record_ust_snapshot(session->ust_session, | |
4063 | &tmp_output, session, | |
d07ceecd | 4064 | wait, nb_packets_per_stream); |
a934f4af | 4065 | if (ret != LTTNG_OK) { |
6dc3064a DG |
4066 | rcu_read_unlock(); |
4067 | goto error; | |
4068 | } | |
4069 | } | |
804c90a8 | 4070 | snapshot_success = 1; |
6dc3064a | 4071 | } |
804c90a8 | 4072 | rcu_read_unlock(); |
6dc3064a DG |
4073 | } |
4074 | ||
1bfe7328 DG |
4075 | if (snapshot_success) { |
4076 | session->snapshot.nb_snapshot++; | |
b67578cb MD |
4077 | } else { |
4078 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
1bfe7328 DG |
4079 | } |
4080 | ||
6dc3064a | 4081 | error: |
6dc3064a DG |
4082 | return ret; |
4083 | } | |
4084 | ||
d7ba1388 MD |
4085 | /* |
4086 | * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread. | |
4087 | */ | |
4088 | int cmd_set_session_shm_path(struct ltt_session *session, | |
4089 | const char *shm_path) | |
4090 | { | |
4091 | /* Safety net */ | |
4092 | assert(session); | |
4093 | ||
4094 | /* | |
4095 | * Can only set shm path before session is started. | |
4096 | */ | |
4097 | if (session->has_been_started) { | |
4098 | return LTTNG_ERR_SESSION_STARTED; | |
4099 | } | |
4100 | ||
4101 | strncpy(session->shm_path, shm_path, | |
4102 | sizeof(session->shm_path)); | |
4103 | session->shm_path[sizeof(session->shm_path) - 1] = '\0'; | |
4104 | ||
4105 | return 0; | |
4106 | } | |
4107 | ||
2f77fc4b DG |
4108 | /* |
4109 | * Init command subsystem. | |
4110 | */ | |
4111 | void cmd_init(void) | |
4112 | { | |
4113 | /* | |
d88aee68 DG |
4114 | * Set network sequence index to 1 for streams to match a relayd |
4115 | * socket on the consumer side. | |
2f77fc4b | 4116 | */ |
d88aee68 DG |
4117 | pthread_mutex_lock(&relayd_net_seq_idx_lock); |
4118 | relayd_net_seq_idx = 1; | |
4119 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
4120 | |
4121 | DBG("Command subsystem initialized"); | |
4122 | } |