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> | |
a503e1ef | 24 | #include <sys/stat.h> |
2f77fc4b DG |
25 | |
26 | #include <common/defaults.h> | |
27 | #include <common/common.h> | |
28 | #include <common/sessiond-comm/sessiond-comm.h> | |
29 | #include <common/relayd/relayd.h> | |
10a50311 | 30 | #include <common/utils.h> |
f5436bfc | 31 | #include <common/compat/string.h> |
93ec662e | 32 | #include <common/kernel-ctl/kernel-ctl.h> |
b0880ae5 JG |
33 | #include <common/dynamic-buffer.h> |
34 | #include <common/buffer-view.h> | |
35 | #include <lttng/trigger/trigger-internal.h> | |
36 | #include <lttng/condition/condition.h> | |
37 | #include <lttng/action/action.h> | |
6e21424e | 38 | #include <lttng/channel.h> |
b0880ae5 | 39 | #include <lttng/channel-internal.h> |
5c408ad8 | 40 | #include <lttng/rotate-internal.h> |
17dd1232 | 41 | #include <lttng/location-internal.h> |
9f449915 | 42 | #include <common/string-utils/string-utils.h> |
2f77fc4b DG |
43 | |
44 | #include "channel.h" | |
45 | #include "consumer.h" | |
46 | #include "event.h" | |
8782cc74 | 47 | #include "health-sessiond.h" |
2f77fc4b DG |
48 | #include "kernel.h" |
49 | #include "kernel-consumer.h" | |
50 | #include "lttng-sessiond.h" | |
51 | #include "utils.h" | |
0dbc2034 | 52 | #include "lttng-syscall.h" |
7c1d2758 | 53 | #include "agent.h" |
93ec662e | 54 | #include "buffer-registry.h" |
b0880ae5 JG |
55 | #include "notification-thread.h" |
56 | #include "notification-thread-commands.h" | |
5c408ad8 JD |
57 | #include "rotate.h" |
58 | #include "rotation-thread.h" | |
59 | #include "sessiond-timer.h" | |
f28f9e44 | 60 | #include "agent-thread.h" |
2f77fc4b DG |
61 | |
62 | #include "cmd.h" | |
63 | ||
a503e1ef JG |
64 | /* Sleep for 100ms between each check for the shm path's deletion. */ |
65 | #define SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US 100000 | |
66 | ||
67 | static enum lttng_error_code wait_on_path(void *path); | |
68 | ||
69 | /* | |
70 | * Command completion handler that is used by the destroy command | |
71 | * when a session that has a non-default shm_path is being destroyed. | |
72 | * | |
73 | * See comment in cmd_destroy_session() for the rationale. | |
74 | */ | |
75 | static struct destroy_completion_handler { | |
76 | struct cmd_completion_handler handler; | |
77 | char shm_path[member_sizeof(struct ltt_session, shm_path)]; | |
78 | } destroy_completion_handler = { | |
79 | .handler = { | |
80 | .run = wait_on_path, | |
81 | .data = destroy_completion_handler.shm_path | |
82 | }, | |
83 | .shm_path = { 0 }, | |
84 | }; | |
85 | ||
86 | static struct cmd_completion_handler *current_completion_handler; | |
87 | ||
2f77fc4b DG |
88 | /* |
89 | * Used to keep a unique index for each relayd socket created where this value | |
90 | * is associated with streams on the consumer so it can match the right relayd | |
d88aee68 DG |
91 | * to send to. It must be accessed with the relayd_net_seq_idx_lock |
92 | * held. | |
2f77fc4b | 93 | */ |
d88aee68 DG |
94 | static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER; |
95 | static uint64_t relayd_net_seq_idx; | |
2f77fc4b | 96 | |
7076b56e JG |
97 | static int validate_ust_event_name(const char *); |
98 | static int cmd_enable_event_internal(struct ltt_session *session, | |
99 | struct lttng_domain *domain, | |
100 | char *channel_name, struct lttng_event *event, | |
101 | char *filter_expression, | |
102 | struct lttng_filter_bytecode *filter, | |
103 | struct lttng_event_exclusion *exclusion, | |
104 | int wpipe); | |
105 | ||
2f77fc4b DG |
106 | /* |
107 | * Create a session path used by list_lttng_sessions for the case that the | |
108 | * session consumer is on the network. | |
109 | */ | |
110 | static int build_network_session_path(char *dst, size_t size, | |
111 | struct ltt_session *session) | |
112 | { | |
113 | int ret, kdata_port, udata_port; | |
114 | struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL; | |
115 | char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX]; | |
116 | ||
117 | assert(session); | |
118 | assert(dst); | |
119 | ||
120 | memset(tmp_urls, 0, sizeof(tmp_urls)); | |
121 | memset(tmp_uurl, 0, sizeof(tmp_uurl)); | |
122 | ||
123 | kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT; | |
124 | ||
125 | if (session->kernel_session && session->kernel_session->consumer) { | |
126 | kuri = &session->kernel_session->consumer->dst.net.control; | |
127 | kdata_port = session->kernel_session->consumer->dst.net.data.port; | |
128 | } | |
129 | ||
130 | if (session->ust_session && session->ust_session->consumer) { | |
131 | uuri = &session->ust_session->consumer->dst.net.control; | |
132 | udata_port = session->ust_session->consumer->dst.net.data.port; | |
133 | } | |
134 | ||
135 | if (uuri == NULL && kuri == NULL) { | |
136 | uri = &session->consumer->dst.net.control; | |
137 | kdata_port = session->consumer->dst.net.data.port; | |
138 | } else if (kuri && uuri) { | |
139 | ret = uri_compare(kuri, uuri); | |
140 | if (ret) { | |
141 | /* Not Equal */ | |
142 | uri = kuri; | |
143 | /* Build uuri URL string */ | |
144 | ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl)); | |
145 | if (ret < 0) { | |
146 | goto error; | |
147 | } | |
148 | } else { | |
149 | uri = kuri; | |
150 | } | |
151 | } else if (kuri && uuri == NULL) { | |
152 | uri = kuri; | |
153 | } else if (uuri && kuri == NULL) { | |
154 | uri = uuri; | |
155 | } | |
156 | ||
157 | ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls)); | |
158 | if (ret < 0) { | |
159 | goto error; | |
160 | } | |
161 | ||
9aa9f900 DG |
162 | /* |
163 | * Do we have a UST url set. If yes, this means we have both kernel and UST | |
164 | * to print. | |
165 | */ | |
9d035200 | 166 | if (*tmp_uurl != '\0') { |
2f77fc4b DG |
167 | ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]", |
168 | tmp_urls, kdata_port, tmp_uurl, udata_port); | |
169 | } else { | |
9aa9f900 | 170 | int dport; |
bef08707 | 171 | if (kuri || (!kuri && !uuri)) { |
9aa9f900 DG |
172 | dport = kdata_port; |
173 | } else { | |
174 | /* No kernel URI, use the UST port. */ | |
175 | dport = udata_port; | |
176 | } | |
177 | ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport); | |
2f77fc4b DG |
178 | } |
179 | ||
180 | error: | |
181 | return ret; | |
182 | } | |
183 | ||
fb83fe64 JD |
184 | /* |
185 | * Get run-time attributes if the session has been started (discarded events, | |
186 | * lost packets). | |
187 | */ | |
188 | static int get_kernel_runtime_stats(struct ltt_session *session, | |
189 | struct ltt_kernel_channel *kchan, uint64_t *discarded_events, | |
190 | uint64_t *lost_packets) | |
191 | { | |
192 | int ret; | |
193 | ||
194 | if (!session->has_been_started) { | |
195 | ret = 0; | |
196 | *discarded_events = 0; | |
197 | *lost_packets = 0; | |
198 | goto end; | |
199 | } | |
200 | ||
e1f3997a | 201 | ret = consumer_get_discarded_events(session->id, kchan->key, |
fb83fe64 JD |
202 | session->kernel_session->consumer, |
203 | discarded_events); | |
204 | if (ret < 0) { | |
205 | goto end; | |
206 | } | |
207 | ||
e1f3997a | 208 | ret = consumer_get_lost_packets(session->id, kchan->key, |
fb83fe64 JD |
209 | session->kernel_session->consumer, |
210 | lost_packets); | |
211 | if (ret < 0) { | |
212 | goto end; | |
213 | } | |
214 | ||
215 | end: | |
216 | return ret; | |
217 | } | |
218 | ||
219 | /* | |
220 | * Get run-time attributes if the session has been started (discarded events, | |
221 | * lost packets). | |
222 | */ | |
223 | static int get_ust_runtime_stats(struct ltt_session *session, | |
224 | struct ltt_ust_channel *uchan, uint64_t *discarded_events, | |
225 | uint64_t *lost_packets) | |
226 | { | |
227 | int ret; | |
228 | struct ltt_ust_session *usess; | |
229 | ||
a91c5803 JG |
230 | if (!discarded_events || !lost_packets) { |
231 | ret = -1; | |
232 | goto end; | |
233 | } | |
234 | ||
fb83fe64 | 235 | usess = session->ust_session; |
a905c624 JG |
236 | assert(discarded_events); |
237 | assert(lost_packets); | |
fb83fe64 JD |
238 | |
239 | if (!usess || !session->has_been_started) { | |
240 | *discarded_events = 0; | |
241 | *lost_packets = 0; | |
242 | ret = 0; | |
243 | goto end; | |
244 | } | |
245 | ||
246 | if (usess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
247 | ret = ust_app_uid_get_channel_runtime_stats(usess->id, | |
248 | &usess->buffer_reg_uid_list, | |
249 | usess->consumer, uchan->id, | |
250 | uchan->attr.overwrite, | |
251 | discarded_events, | |
252 | lost_packets); | |
253 | } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
254 | ret = ust_app_pid_get_channel_runtime_stats(usess, | |
255 | uchan, usess->consumer, | |
256 | uchan->attr.overwrite, | |
257 | discarded_events, | |
258 | lost_packets); | |
259 | if (ret < 0) { | |
260 | goto end; | |
261 | } | |
262 | *discarded_events += uchan->per_pid_closed_app_discarded; | |
263 | *lost_packets += uchan->per_pid_closed_app_lost; | |
264 | } else { | |
265 | ERR("Unsupported buffer type"); | |
967bc289 | 266 | assert(0); |
fb83fe64 JD |
267 | ret = -1; |
268 | goto end; | |
269 | } | |
270 | ||
271 | end: | |
272 | return ret; | |
273 | } | |
274 | ||
2f77fc4b DG |
275 | /* |
276 | * Fill lttng_channel array of all channels. | |
277 | */ | |
d449df4a | 278 | static ssize_t list_lttng_channels(enum lttng_domain_type domain, |
fb83fe64 | 279 | struct ltt_session *session, struct lttng_channel *channels, |
cf0bcb51 | 280 | struct lttng_channel_extended *chan_exts) |
2f77fc4b | 281 | { |
d449df4a | 282 | int i = 0, ret = 0; |
2f77fc4b DG |
283 | struct ltt_kernel_channel *kchan; |
284 | ||
285 | DBG("Listing channels for session %s", session->name); | |
286 | ||
287 | switch (domain) { | |
288 | case LTTNG_DOMAIN_KERNEL: | |
289 | /* Kernel channels */ | |
290 | if (session->kernel_session != NULL) { | |
291 | cds_list_for_each_entry(kchan, | |
292 | &session->kernel_session->channel_list.head, list) { | |
fb83fe64 | 293 | uint64_t discarded_events, lost_packets; |
cf0bcb51 JG |
294 | struct lttng_channel_extended *extended; |
295 | ||
296 | extended = (struct lttng_channel_extended *) | |
297 | kchan->channel->attr.extended.ptr; | |
fb83fe64 JD |
298 | |
299 | ret = get_kernel_runtime_stats(session, kchan, | |
300 | &discarded_events, &lost_packets); | |
301 | if (ret < 0) { | |
302 | goto end; | |
303 | } | |
2f77fc4b DG |
304 | /* Copy lttng_channel struct to array */ |
305 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
306 | channels[i].enabled = kchan->enabled; | |
fb83fe64 JD |
307 | chan_exts[i].discarded_events = |
308 | discarded_events; | |
309 | chan_exts[i].lost_packets = lost_packets; | |
cf0bcb51 JG |
310 | chan_exts[i].monitor_timer_interval = |
311 | extended->monitor_timer_interval; | |
491d1539 | 312 | chan_exts[i].blocking_timeout = 0; |
2f77fc4b DG |
313 | i++; |
314 | } | |
315 | } | |
316 | break; | |
317 | case LTTNG_DOMAIN_UST: | |
318 | { | |
319 | struct lttng_ht_iter iter; | |
320 | struct ltt_ust_channel *uchan; | |
321 | ||
e7fe706f | 322 | rcu_read_lock(); |
2f77fc4b DG |
323 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
324 | &iter.iter, uchan, node.node) { | |
a91c5803 | 325 | uint64_t discarded_events = 0, lost_packets = 0; |
fb83fe64 | 326 | |
8ee609c8 MD |
327 | if (lttng_strncpy(channels[i].name, uchan->name, |
328 | LTTNG_SYMBOL_NAME_LEN)) { | |
329 | break; | |
330 | } | |
2f77fc4b DG |
331 | channels[i].attr.overwrite = uchan->attr.overwrite; |
332 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
333 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
334 | channels[i].attr.switch_timer_interval = | |
335 | uchan->attr.switch_timer_interval; | |
336 | channels[i].attr.read_timer_interval = | |
337 | uchan->attr.read_timer_interval; | |
338 | channels[i].enabled = uchan->enabled; | |
2f785fe7 DG |
339 | channels[i].attr.tracefile_size = uchan->tracefile_size; |
340 | channels[i].attr.tracefile_count = uchan->tracefile_count; | |
5e4435a4 JG |
341 | |
342 | /* | |
343 | * Map enum lttng_ust_output to enum lttng_event_output. | |
344 | */ | |
2f77fc4b DG |
345 | switch (uchan->attr.output) { |
346 | case LTTNG_UST_MMAP: | |
2f77fc4b DG |
347 | channels[i].attr.output = LTTNG_EVENT_MMAP; |
348 | break; | |
5e4435a4 JG |
349 | default: |
350 | /* | |
351 | * LTTNG_UST_MMAP is the only supported UST | |
352 | * output mode. | |
353 | */ | |
354 | assert(0); | |
355 | break; | |
2f77fc4b | 356 | } |
fb83fe64 | 357 | |
d449df4a MD |
358 | chan_exts[i].monitor_timer_interval = |
359 | uchan->monitor_timer_interval; | |
491d1539 MD |
360 | chan_exts[i].blocking_timeout = |
361 | uchan->attr.u.s.blocking_timeout; | |
d449df4a | 362 | |
fb83fe64 JD |
363 | ret = get_ust_runtime_stats(session, uchan, |
364 | &discarded_events, &lost_packets); | |
365 | if (ret < 0) { | |
366 | break; | |
367 | } | |
368 | chan_exts[i].discarded_events = discarded_events; | |
369 | chan_exts[i].lost_packets = lost_packets; | |
2f77fc4b DG |
370 | i++; |
371 | } | |
e7fe706f | 372 | rcu_read_unlock(); |
2f77fc4b DG |
373 | break; |
374 | } | |
375 | default: | |
376 | break; | |
377 | } | |
fb83fe64 JD |
378 | |
379 | end: | |
d449df4a MD |
380 | if (ret < 0) { |
381 | return -LTTNG_ERR_FATAL; | |
382 | } else { | |
383 | return LTTNG_OK; | |
384 | } | |
2f77fc4b DG |
385 | } |
386 | ||
b4e3ceb9 | 387 | static void increment_extended_len(const char *filter_expression, |
795d57ce | 388 | struct lttng_event_exclusion *exclusion, size_t *extended_len) |
b4e3ceb9 PP |
389 | { |
390 | *extended_len += sizeof(struct lttcomm_event_extended_header); | |
391 | ||
392 | if (filter_expression) { | |
393 | *extended_len += strlen(filter_expression) + 1; | |
394 | } | |
795d57ce PP |
395 | |
396 | if (exclusion) { | |
397 | *extended_len += exclusion->count * LTTNG_SYMBOL_NAME_LEN; | |
398 | } | |
b4e3ceb9 PP |
399 | } |
400 | ||
401 | static void append_extended_info(const char *filter_expression, | |
795d57ce | 402 | struct lttng_event_exclusion *exclusion, void **extended_at) |
b4e3ceb9 PP |
403 | { |
404 | struct lttcomm_event_extended_header extended_header; | |
405 | size_t filter_len = 0; | |
795d57ce | 406 | size_t nb_exclusions = 0; |
b4e3ceb9 PP |
407 | |
408 | if (filter_expression) { | |
409 | filter_len = strlen(filter_expression) + 1; | |
410 | } | |
411 | ||
795d57ce PP |
412 | if (exclusion) { |
413 | nb_exclusions = exclusion->count; | |
414 | } | |
415 | ||
416 | /* Set header fields */ | |
b4e3ceb9 | 417 | extended_header.filter_len = filter_len; |
795d57ce PP |
418 | extended_header.nb_exclusions = nb_exclusions; |
419 | ||
420 | /* Copy header */ | |
b4e3ceb9 PP |
421 | memcpy(*extended_at, &extended_header, sizeof(extended_header)); |
422 | *extended_at += sizeof(extended_header); | |
795d57ce PP |
423 | |
424 | /* Copy filter string */ | |
425 | if (filter_expression) { | |
426 | memcpy(*extended_at, filter_expression, filter_len); | |
427 | *extended_at += filter_len; | |
428 | } | |
429 | ||
430 | /* Copy exclusion names */ | |
431 | if (exclusion) { | |
432 | size_t len = nb_exclusions * LTTNG_SYMBOL_NAME_LEN; | |
433 | ||
434 | memcpy(*extended_at, &exclusion->names, len); | |
435 | *extended_at += len; | |
436 | } | |
b4e3ceb9 PP |
437 | } |
438 | ||
3c6a091f | 439 | /* |
022d91ba | 440 | * Create a list of agent domain events. |
3c6a091f DG |
441 | * |
442 | * Return number of events in list on success or else a negative value. | |
443 | */ | |
022d91ba | 444 | static int list_lttng_agent_events(struct agent *agt, |
b4e3ceb9 | 445 | struct lttng_event **events, size_t *total_size) |
3c6a091f DG |
446 | { |
447 | int i = 0, ret = 0; | |
448 | unsigned int nb_event = 0; | |
022d91ba | 449 | struct agent_event *event; |
3c6a091f DG |
450 | struct lttng_event *tmp_events; |
451 | struct lttng_ht_iter iter; | |
b4e3ceb9 PP |
452 | size_t extended_len = 0; |
453 | void *extended_at; | |
3c6a091f | 454 | |
022d91ba | 455 | assert(agt); |
3c6a091f DG |
456 | assert(events); |
457 | ||
022d91ba | 458 | DBG3("Listing agent events"); |
3c6a091f | 459 | |
e5bbf678 | 460 | rcu_read_lock(); |
022d91ba | 461 | nb_event = lttng_ht_get_count(agt->events); |
e5bbf678 | 462 | rcu_read_unlock(); |
3c6a091f DG |
463 | if (nb_event == 0) { |
464 | ret = nb_event; | |
b4e3ceb9 | 465 | *total_size = 0; |
3c6a091f DG |
466 | goto error; |
467 | } | |
468 | ||
b4e3ceb9 PP |
469 | /* Compute required extended infos size */ |
470 | extended_len = nb_event * sizeof(struct lttcomm_event_extended_header); | |
471 | ||
472 | /* | |
473 | * This is only valid because the commands which add events are | |
474 | * processed in the same thread as the listing. | |
475 | */ | |
476 | rcu_read_lock(); | |
477 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { | |
795d57ce PP |
478 | increment_extended_len(event->filter_expression, NULL, |
479 | &extended_len); | |
b4e3ceb9 PP |
480 | } |
481 | rcu_read_unlock(); | |
482 | ||
483 | *total_size = nb_event * sizeof(*tmp_events) + extended_len; | |
484 | tmp_events = zmalloc(*total_size); | |
3c6a091f | 485 | if (!tmp_events) { |
022d91ba | 486 | PERROR("zmalloc agent events session"); |
3c6a091f DG |
487 | ret = -LTTNG_ERR_FATAL; |
488 | goto error; | |
489 | } | |
490 | ||
b4e3ceb9 PP |
491 | extended_at = ((uint8_t *) tmp_events) + |
492 | nb_event * sizeof(struct lttng_event); | |
493 | ||
3c6a091f | 494 | rcu_read_lock(); |
022d91ba | 495 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
3c6a091f DG |
496 | strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name)); |
497 | tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0'; | |
498 | tmp_events[i].enabled = event->enabled; | |
2106efa0 | 499 | tmp_events[i].loglevel = event->loglevel_value; |
ff94328f | 500 | tmp_events[i].loglevel_type = event->loglevel_type; |
3c6a091f | 501 | i++; |
b4e3ceb9 PP |
502 | |
503 | /* Append extended info */ | |
795d57ce PP |
504 | append_extended_info(event->filter_expression, NULL, |
505 | &extended_at); | |
3c6a091f DG |
506 | } |
507 | rcu_read_unlock(); | |
508 | ||
509 | *events = tmp_events; | |
510 | ret = nb_event; | |
511 | ||
512 | error: | |
513 | assert(nb_event == i); | |
514 | return ret; | |
515 | } | |
516 | ||
2f77fc4b DG |
517 | /* |
518 | * Create a list of ust global domain events. | |
519 | */ | |
520 | static int list_lttng_ust_global_events(char *channel_name, | |
b4e3ceb9 PP |
521 | struct ltt_ust_domain_global *ust_global, |
522 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
523 | { |
524 | int i = 0, ret = 0; | |
525 | unsigned int nb_event = 0; | |
526 | struct lttng_ht_iter iter; | |
527 | struct lttng_ht_node_str *node; | |
528 | struct ltt_ust_channel *uchan; | |
529 | struct ltt_ust_event *uevent; | |
530 | struct lttng_event *tmp; | |
b4e3ceb9 PP |
531 | size_t extended_len = 0; |
532 | void *extended_at; | |
2f77fc4b DG |
533 | |
534 | DBG("Listing UST global events for channel %s", channel_name); | |
535 | ||
536 | rcu_read_lock(); | |
537 | ||
538 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); | |
539 | node = lttng_ht_iter_get_node_str(&iter); | |
540 | if (node == NULL) { | |
f73fabfd | 541 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
d31d3e8c | 542 | goto end; |
2f77fc4b DG |
543 | } |
544 | ||
545 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); | |
546 | ||
3c442be3 | 547 | nb_event = lttng_ht_get_count(uchan->events); |
2f77fc4b DG |
548 | if (nb_event == 0) { |
549 | ret = nb_event; | |
b4e3ceb9 | 550 | *total_size = 0; |
d31d3e8c | 551 | goto end; |
2f77fc4b DG |
552 | } |
553 | ||
554 | DBG3("Listing UST global %d events", nb_event); | |
555 | ||
b4e3ceb9 PP |
556 | /* Compute required extended infos size */ |
557 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { | |
558 | if (uevent->internal) { | |
559 | nb_event--; | |
560 | continue; | |
561 | } | |
562 | ||
563 | increment_extended_len(uevent->filter_expression, | |
795d57ce | 564 | uevent->exclusion, &extended_len); |
b4e3ceb9 | 565 | } |
d31d3e8c PP |
566 | if (nb_event == 0) { |
567 | /* All events are internal, skip. */ | |
568 | ret = 0; | |
569 | *total_size = 0; | |
570 | goto end; | |
571 | } | |
b4e3ceb9 PP |
572 | |
573 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
574 | tmp = zmalloc(*total_size); | |
2f77fc4b | 575 | if (tmp == NULL) { |
b12c38df JG |
576 | ret = -LTTNG_ERR_FATAL; |
577 | goto end; | |
2f77fc4b DG |
578 | } |
579 | ||
b4e3ceb9 PP |
580 | extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event); |
581 | ||
2f77fc4b | 582 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
3c442be3 JG |
583 | if (uevent->internal) { |
584 | /* This event should remain hidden from clients */ | |
3c442be3 JG |
585 | continue; |
586 | } | |
2f77fc4b DG |
587 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
588 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
589 | tmp[i].enabled = uevent->enabled; | |
590 | ||
591 | switch (uevent->attr.instrumentation) { | |
592 | case LTTNG_UST_TRACEPOINT: | |
593 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
594 | break; | |
595 | case LTTNG_UST_PROBE: | |
596 | tmp[i].type = LTTNG_EVENT_PROBE; | |
597 | break; | |
598 | case LTTNG_UST_FUNCTION: | |
599 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
600 | break; | |
601 | } | |
602 | ||
603 | tmp[i].loglevel = uevent->attr.loglevel; | |
604 | switch (uevent->attr.loglevel_type) { | |
605 | case LTTNG_UST_LOGLEVEL_ALL: | |
606 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
607 | break; | |
608 | case LTTNG_UST_LOGLEVEL_RANGE: | |
609 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; | |
610 | break; | |
611 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
612 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; | |
613 | break; | |
614 | } | |
615 | if (uevent->filter) { | |
616 | tmp[i].filter = 1; | |
617 | } | |
4634f12e JI |
618 | if (uevent->exclusion) { |
619 | tmp[i].exclusion = 1; | |
620 | } | |
2f77fc4b | 621 | i++; |
b4e3ceb9 PP |
622 | |
623 | /* Append extended info */ | |
795d57ce PP |
624 | append_extended_info(uevent->filter_expression, |
625 | uevent->exclusion, &extended_at); | |
2f77fc4b DG |
626 | } |
627 | ||
628 | ret = nb_event; | |
629 | *events = tmp; | |
d31d3e8c | 630 | end: |
2f77fc4b DG |
631 | rcu_read_unlock(); |
632 | return ret; | |
633 | } | |
634 | ||
635 | /* | |
636 | * Fill lttng_event array of all kernel events in the channel. | |
637 | */ | |
638 | static int list_lttng_kernel_events(char *channel_name, | |
b4e3ceb9 PP |
639 | struct ltt_kernel_session *kernel_session, |
640 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
641 | { |
642 | int i = 0, ret; | |
643 | unsigned int nb_event; | |
644 | struct ltt_kernel_event *event; | |
645 | struct ltt_kernel_channel *kchan; | |
b4e3ceb9 PP |
646 | size_t extended_len = 0; |
647 | void *extended_at; | |
2f77fc4b DG |
648 | |
649 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
650 | if (kchan == NULL) { | |
f73fabfd | 651 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
652 | goto error; |
653 | } | |
654 | ||
655 | nb_event = kchan->event_count; | |
656 | ||
657 | DBG("Listing events for channel %s", kchan->channel->name); | |
658 | ||
659 | if (nb_event == 0) { | |
b4e3ceb9 | 660 | *total_size = 0; |
834978fd | 661 | *events = NULL; |
db906c12 | 662 | goto end; |
2f77fc4b DG |
663 | } |
664 | ||
b4e3ceb9 PP |
665 | /* Compute required extended infos size */ |
666 | cds_list_for_each_entry(event, &kchan->events_list.head, list) { | |
795d57ce PP |
667 | increment_extended_len(event->filter_expression, NULL, |
668 | &extended_len); | |
b4e3ceb9 PP |
669 | } |
670 | ||
671 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
672 | *events = zmalloc(*total_size); | |
2f77fc4b | 673 | if (*events == NULL) { |
f73fabfd | 674 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
675 | goto error; |
676 | } | |
677 | ||
ab4aa612 | 678 | extended_at = ((void *) *events) + |
b4e3ceb9 PP |
679 | nb_event * sizeof(struct lttng_event); |
680 | ||
2f77fc4b DG |
681 | /* Kernel channels */ |
682 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
683 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
684 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
685 | (*events)[i].enabled = event->enabled; | |
00f992f2 JG |
686 | (*events)[i].filter = |
687 | (unsigned char) !!event->filter_expression; | |
2f77fc4b DG |
688 | |
689 | switch (event->event->instrumentation) { | |
690 | case LTTNG_KERNEL_TRACEPOINT: | |
691 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; | |
692 | break; | |
2f77fc4b | 693 | case LTTNG_KERNEL_KRETPROBE: |
1896972b DG |
694 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
695 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
696 | sizeof(struct lttng_kernel_kprobe)); | |
697 | break; | |
698 | case LTTNG_KERNEL_KPROBE: | |
2f77fc4b DG |
699 | (*events)[i].type = LTTNG_EVENT_PROBE; |
700 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
701 | sizeof(struct lttng_kernel_kprobe)); | |
702 | break; | |
703 | case LTTNG_KERNEL_FUNCTION: | |
704 | (*events)[i].type = LTTNG_EVENT_FUNCTION; | |
705 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
706 | sizeof(struct lttng_kernel_function)); | |
707 | break; | |
708 | case LTTNG_KERNEL_NOOP: | |
709 | (*events)[i].type = LTTNG_EVENT_NOOP; | |
710 | break; | |
711 | case LTTNG_KERNEL_SYSCALL: | |
712 | (*events)[i].type = LTTNG_EVENT_SYSCALL; | |
713 | break; | |
714 | case LTTNG_KERNEL_ALL: | |
1ab8c2ad FD |
715 | /* fall-through. */ |
716 | default: | |
2f77fc4b DG |
717 | assert(0); |
718 | break; | |
719 | } | |
720 | i++; | |
b4e3ceb9 PP |
721 | |
722 | /* Append extended info */ | |
795d57ce PP |
723 | append_extended_info(event->filter_expression, NULL, |
724 | &extended_at); | |
2f77fc4b DG |
725 | } |
726 | ||
db906c12 | 727 | end: |
2f77fc4b DG |
728 | return nb_event; |
729 | ||
730 | error: | |
f73fabfd DG |
731 | /* Negate the error code to differentiate the size from an error */ |
732 | return -ret; | |
2f77fc4b DG |
733 | } |
734 | ||
735 | /* | |
736 | * Add URI so the consumer output object. Set the correct path depending on the | |
737 | * domain adding the default trace directory. | |
738 | */ | |
739 | static int add_uri_to_consumer(struct consumer_output *consumer, | |
56a37563 JG |
740 | struct lttng_uri *uri, enum lttng_domain_type domain, |
741 | const char *session_name) | |
2f77fc4b | 742 | { |
f73fabfd | 743 | int ret = LTTNG_OK; |
2f77fc4b DG |
744 | const char *default_trace_dir; |
745 | ||
746 | assert(uri); | |
747 | ||
748 | if (consumer == NULL) { | |
749 | DBG("No consumer detected. Don't add URI. Stopping."); | |
f73fabfd | 750 | ret = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
751 | goto error; |
752 | } | |
753 | ||
754 | switch (domain) { | |
755 | case LTTNG_DOMAIN_KERNEL: | |
756 | default_trace_dir = DEFAULT_KERNEL_TRACE_DIR; | |
757 | break; | |
758 | case LTTNG_DOMAIN_UST: | |
759 | default_trace_dir = DEFAULT_UST_TRACE_DIR; | |
760 | break; | |
761 | default: | |
762 | /* | |
763 | * This case is possible is we try to add the URI to the global tracing | |
764 | * session consumer object which in this case there is no subdir. | |
765 | */ | |
766 | default_trace_dir = ""; | |
767 | } | |
768 | ||
769 | switch (uri->dtype) { | |
770 | case LTTNG_DST_IPV4: | |
771 | case LTTNG_DST_IPV6: | |
772 | DBG2("Setting network URI to consumer"); | |
773 | ||
df75acac DG |
774 | if (consumer->type == CONSUMER_DST_NET) { |
775 | if ((uri->stype == LTTNG_STREAM_CONTROL && | |
785d2d0d DG |
776 | consumer->dst.net.control_isset) || |
777 | (uri->stype == LTTNG_STREAM_DATA && | |
778 | consumer->dst.net.data_isset)) { | |
df75acac DG |
779 | ret = LTTNG_ERR_URL_EXIST; |
780 | goto error; | |
781 | } | |
782 | } else { | |
783 | memset(&consumer->dst.net, 0, sizeof(consumer->dst.net)); | |
785d2d0d DG |
784 | } |
785 | ||
df75acac DG |
786 | consumer->type = CONSUMER_DST_NET; |
787 | ||
2f77fc4b DG |
788 | /* Set URI into consumer output object */ |
789 | ret = consumer_set_network_uri(consumer, uri); | |
790 | if (ret < 0) { | |
a74934ba | 791 | ret = -ret; |
2f77fc4b DG |
792 | goto error; |
793 | } else if (ret == 1) { | |
794 | /* | |
795 | * URI was the same in the consumer so we do not append the subdir | |
796 | * again so to not duplicate output dir. | |
797 | */ | |
f86c9f4e | 798 | ret = LTTNG_OK; |
2f77fc4b DG |
799 | goto error; |
800 | } | |
801 | ||
802 | if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) { | |
803 | ret = consumer_set_subdir(consumer, session_name); | |
804 | if (ret < 0) { | |
f73fabfd | 805 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
806 | goto error; |
807 | } | |
808 | } | |
809 | ||
810 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
811 | /* On a new subdir, reappend the default trace dir. */ | |
c30ce0b3 CB |
812 | strncat(consumer->subdir, default_trace_dir, |
813 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
814 | DBG3("Append domain trace name to subdir %s", consumer->subdir); |
815 | } | |
816 | ||
817 | break; | |
818 | case LTTNG_DST_PATH: | |
819 | DBG2("Setting trace directory path from URI to %s", uri->dst.path); | |
366a9222 JD |
820 | memset(consumer->dst.session_root_path, 0, |
821 | sizeof(consumer->dst.session_root_path)); | |
9ac05d92 MD |
822 | /* Explicit length checks for strcpy and strcat. */ |
823 | if (strlen(uri->dst.path) + strlen(default_trace_dir) | |
366a9222 | 824 | >= sizeof(consumer->dst.session_root_path)) { |
9ac05d92 MD |
825 | ret = LTTNG_ERR_FATAL; |
826 | goto error; | |
827 | } | |
366a9222 | 828 | strcpy(consumer->dst.session_root_path, uri->dst.path); |
2f77fc4b | 829 | /* Append default trace dir */ |
366a9222 | 830 | strcat(consumer->dst.session_root_path, default_trace_dir); |
2f77fc4b DG |
831 | /* Flag consumer as local. */ |
832 | consumer->type = CONSUMER_DST_LOCAL; | |
833 | break; | |
834 | } | |
835 | ||
a74934ba DG |
836 | ret = LTTNG_OK; |
837 | ||
2f77fc4b DG |
838 | error: |
839 | return ret; | |
840 | } | |
841 | ||
842 | /* | |
843 | * Init tracing by creating trace directory and sending fds kernel consumer. | |
844 | */ | |
845 | static int init_kernel_tracing(struct ltt_kernel_session *session) | |
846 | { | |
847 | int ret = 0; | |
848 | struct lttng_ht_iter iter; | |
849 | struct consumer_socket *socket; | |
850 | ||
851 | assert(session); | |
852 | ||
e7fe706f DG |
853 | rcu_read_lock(); |
854 | ||
2f77fc4b DG |
855 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { |
856 | cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter, | |
857 | socket, node.node) { | |
2f77fc4b | 858 | pthread_mutex_lock(socket->lock); |
f50f23d9 | 859 | ret = kernel_consumer_send_session(socket, session); |
2f77fc4b DG |
860 | pthread_mutex_unlock(socket->lock); |
861 | if (ret < 0) { | |
f73fabfd | 862 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
863 | goto error; |
864 | } | |
865 | } | |
866 | } | |
867 | ||
868 | error: | |
e7fe706f | 869 | rcu_read_unlock(); |
2f77fc4b DG |
870 | return ret; |
871 | } | |
872 | ||
873 | /* | |
874 | * Create a socket to the relayd using the URI. | |
875 | * | |
876 | * On success, the relayd_sock pointer is set to the created socket. | |
877 | * Else, it's stays untouched and a lttcomm error code is returned. | |
878 | */ | |
6151a90f | 879 | static int create_connect_relayd(struct lttng_uri *uri, |
b31610f2 JD |
880 | struct lttcomm_relayd_sock **relayd_sock, |
881 | struct consumer_output *consumer) | |
2f77fc4b DG |
882 | { |
883 | int ret; | |
6151a90f | 884 | struct lttcomm_relayd_sock *rsock; |
2f77fc4b | 885 | |
6151a90f JD |
886 | rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR, |
887 | RELAYD_VERSION_COMM_MINOR); | |
888 | if (!rsock) { | |
f73fabfd | 889 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
890 | goto error; |
891 | } | |
892 | ||
ffe60014 DG |
893 | /* |
894 | * Connect to relayd so we can proceed with a session creation. This call | |
895 | * can possibly block for an arbitrary amount of time to set the health | |
896 | * state to be in poll execution. | |
897 | */ | |
898 | health_poll_entry(); | |
6151a90f | 899 | ret = relayd_connect(rsock); |
ffe60014 | 900 | health_poll_exit(); |
2f77fc4b DG |
901 | if (ret < 0) { |
902 | ERR("Unable to reach lttng-relayd"); | |
f73fabfd | 903 | ret = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
904 | goto free_sock; |
905 | } | |
906 | ||
907 | /* Create socket for control stream. */ | |
908 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
909 | DBG3("Creating relayd stream socket from URI"); | |
910 | ||
911 | /* Check relayd version */ | |
6151a90f | 912 | ret = relayd_version_check(rsock); |
67d5aa28 JD |
913 | if (ret == LTTNG_ERR_RELAYD_VERSION_FAIL) { |
914 | goto close_sock; | |
915 | } else if (ret < 0) { | |
916 | ERR("Unable to reach lttng-relayd"); | |
917 | ret = LTTNG_ERR_RELAYD_CONNECT_FAIL; | |
2f77fc4b DG |
918 | goto close_sock; |
919 | } | |
b31610f2 JD |
920 | consumer->relay_major_version = rsock->major; |
921 | consumer->relay_minor_version = rsock->minor; | |
2f77fc4b DG |
922 | } else if (uri->stype == LTTNG_STREAM_DATA) { |
923 | DBG3("Creating relayd data socket from URI"); | |
924 | } else { | |
925 | /* Command is not valid */ | |
926 | ERR("Relayd invalid stream type: %d", uri->stype); | |
f73fabfd | 927 | ret = LTTNG_ERR_INVALID; |
2f77fc4b DG |
928 | goto close_sock; |
929 | } | |
930 | ||
6151a90f | 931 | *relayd_sock = rsock; |
2f77fc4b | 932 | |
f73fabfd | 933 | return LTTNG_OK; |
2f77fc4b DG |
934 | |
935 | close_sock: | |
6151a90f JD |
936 | /* The returned value is not useful since we are on an error path. */ |
937 | (void) relayd_close(rsock); | |
2f77fc4b | 938 | free_sock: |
6151a90f | 939 | free(rsock); |
2f77fc4b DG |
940 | error: |
941 | return ret; | |
942 | } | |
943 | ||
944 | /* | |
945 | * Connect to the relayd using URI and send the socket to the right consumer. | |
43fade62 JG |
946 | * |
947 | * The consumer socket lock must be held by the caller. | |
2f77fc4b | 948 | */ |
3044f922 JR |
949 | static int send_consumer_relayd_socket(unsigned int session_id, |
950 | struct lttng_uri *relayd_uri, | |
56a37563 | 951 | struct consumer_output *consumer, |
d3e2ba59 JD |
952 | struct consumer_socket *consumer_sock, |
953 | char *session_name, char *hostname, int session_live_timer) | |
2f77fc4b DG |
954 | { |
955 | int ret; | |
6151a90f | 956 | struct lttcomm_relayd_sock *rsock = NULL; |
2f77fc4b | 957 | |
ffe60014 | 958 | /* Connect to relayd and make version check if uri is the control. */ |
b31610f2 | 959 | ret = create_connect_relayd(relayd_uri, &rsock, consumer); |
ffe60014 | 960 | if (ret != LTTNG_OK) { |
9e218353 | 961 | goto relayd_comm_error; |
ffe60014 | 962 | } |
6151a90f | 963 | assert(rsock); |
ffe60014 | 964 | |
2f77fc4b | 965 | /* Set the network sequence index if not set. */ |
d88aee68 DG |
966 | if (consumer->net_seq_index == (uint64_t) -1ULL) { |
967 | pthread_mutex_lock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
968 | /* |
969 | * Increment net_seq_idx because we are about to transfer the | |
970 | * new relayd socket to the consumer. | |
d88aee68 | 971 | * Assign unique key so the consumer can match streams. |
2f77fc4b | 972 | */ |
d88aee68 DG |
973 | consumer->net_seq_index = ++relayd_net_seq_idx; |
974 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
975 | } |
976 | ||
2f77fc4b | 977 | /* Send relayd socket to consumer. */ |
6151a90f | 978 | ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer, |
d3e2ba59 JD |
979 | relayd_uri->stype, session_id, |
980 | session_name, hostname, session_live_timer); | |
2f77fc4b | 981 | if (ret < 0) { |
f73fabfd | 982 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
983 | goto close_sock; |
984 | } | |
985 | ||
c890b720 DG |
986 | /* Flag that the corresponding socket was sent. */ |
987 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
ffe60014 | 988 | consumer_sock->control_sock_sent = 1; |
c890b720 | 989 | } else if (relayd_uri->stype == LTTNG_STREAM_DATA) { |
ffe60014 | 990 | consumer_sock->data_sock_sent = 1; |
c890b720 DG |
991 | } |
992 | ||
f73fabfd | 993 | ret = LTTNG_OK; |
2f77fc4b DG |
994 | |
995 | /* | |
996 | * Close socket which was dup on the consumer side. The session daemon does | |
997 | * NOT keep track of the relayd socket(s) once transfer to the consumer. | |
998 | */ | |
999 | ||
1000 | close_sock: | |
ffe60014 DG |
1001 | if (ret != LTTNG_OK) { |
1002 | /* | |
d9078d0c DG |
1003 | * The consumer output for this session should not be used anymore |
1004 | * since the relayd connection failed thus making any tracing or/and | |
1005 | * streaming not usable. | |
ffe60014 | 1006 | */ |
d9078d0c | 1007 | consumer->enabled = 0; |
ffe60014 | 1008 | } |
9e218353 JR |
1009 | (void) relayd_close(rsock); |
1010 | free(rsock); | |
1011 | ||
1012 | relayd_comm_error: | |
2f77fc4b DG |
1013 | return ret; |
1014 | } | |
1015 | ||
1016 | /* | |
1017 | * Send both relayd sockets to a specific consumer and domain. This is a | |
1018 | * helper function to facilitate sending the information to the consumer for a | |
1019 | * session. | |
43fade62 JG |
1020 | * |
1021 | * The consumer socket lock must be held by the caller. | |
2f77fc4b | 1022 | */ |
56a37563 JG |
1023 | static int send_consumer_relayd_sockets(enum lttng_domain_type domain, |
1024 | unsigned int session_id, struct consumer_output *consumer, | |
1025 | struct consumer_socket *sock, char *session_name, | |
1026 | char *hostname, int session_live_timer) | |
2f77fc4b | 1027 | { |
dda67f6c | 1028 | int ret = LTTNG_OK; |
2f77fc4b | 1029 | |
2f77fc4b | 1030 | assert(consumer); |
6dc3064a | 1031 | assert(sock); |
2f77fc4b | 1032 | |
2f77fc4b | 1033 | /* Sending control relayd socket. */ |
ffe60014 | 1034 | if (!sock->control_sock_sent) { |
3044f922 | 1035 | ret = send_consumer_relayd_socket(session_id, |
d3e2ba59 JD |
1036 | &consumer->dst.net.control, consumer, sock, |
1037 | session_name, hostname, session_live_timer); | |
c890b720 DG |
1038 | if (ret != LTTNG_OK) { |
1039 | goto error; | |
1040 | } | |
2f77fc4b DG |
1041 | } |
1042 | ||
1043 | /* Sending data relayd socket. */ | |
ffe60014 | 1044 | if (!sock->data_sock_sent) { |
3044f922 | 1045 | ret = send_consumer_relayd_socket(session_id, |
d3e2ba59 JD |
1046 | &consumer->dst.net.data, consumer, sock, |
1047 | session_name, hostname, session_live_timer); | |
c890b720 DG |
1048 | if (ret != LTTNG_OK) { |
1049 | goto error; | |
1050 | } | |
2f77fc4b DG |
1051 | } |
1052 | ||
2f77fc4b DG |
1053 | error: |
1054 | return ret; | |
1055 | } | |
1056 | ||
1057 | /* | |
1058 | * Setup relayd connections for a tracing session. First creates the socket to | |
1059 | * the relayd and send them to the right domain consumer. Consumer type MUST be | |
1060 | * network. | |
1061 | */ | |
ffe60014 | 1062 | int cmd_setup_relayd(struct ltt_session *session) |
2f77fc4b | 1063 | { |
f73fabfd | 1064 | int ret = LTTNG_OK; |
2f77fc4b DG |
1065 | struct ltt_ust_session *usess; |
1066 | struct ltt_kernel_session *ksess; | |
1067 | struct consumer_socket *socket; | |
1068 | struct lttng_ht_iter iter; | |
1069 | ||
1070 | assert(session); | |
1071 | ||
1072 | usess = session->ust_session; | |
1073 | ksess = session->kernel_session; | |
1074 | ||
785d2d0d | 1075 | DBG("Setting relayd for session %s", session->name); |
2f77fc4b | 1076 | |
e7fe706f DG |
1077 | rcu_read_lock(); |
1078 | ||
2f77fc4b DG |
1079 | if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET |
1080 | && usess->consumer->enabled) { | |
1081 | /* For each consumer socket, send relayd sockets */ | |
1082 | cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, | |
1083 | socket, node.node) { | |
2f77fc4b | 1084 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1085 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id, |
d3e2ba59 JD |
1086 | usess->consumer, socket, |
1087 | session->name, session->hostname, | |
1088 | session->live_timer); | |
2f77fc4b | 1089 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1090 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1091 | goto error; |
1092 | } | |
6dc3064a DG |
1093 | /* Session is now ready for network streaming. */ |
1094 | session->net_handle = 1; | |
2f77fc4b | 1095 | } |
b31610f2 JD |
1096 | session->consumer->relay_major_version = |
1097 | usess->consumer->relay_major_version; | |
1098 | session->consumer->relay_minor_version = | |
1099 | usess->consumer->relay_minor_version; | |
2f77fc4b DG |
1100 | } |
1101 | ||
1102 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET | |
1103 | && ksess->consumer->enabled) { | |
1104 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1105 | socket, node.node) { | |
2f77fc4b | 1106 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1107 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id, |
d3e2ba59 JD |
1108 | ksess->consumer, socket, |
1109 | session->name, session->hostname, | |
1110 | session->live_timer); | |
2f77fc4b | 1111 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1112 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1113 | goto error; |
1114 | } | |
6dc3064a DG |
1115 | /* Session is now ready for network streaming. */ |
1116 | session->net_handle = 1; | |
2f77fc4b | 1117 | } |
b31610f2 JD |
1118 | session->consumer->relay_major_version = |
1119 | ksess->consumer->relay_major_version; | |
1120 | session->consumer->relay_minor_version = | |
1121 | ksess->consumer->relay_minor_version; | |
2f77fc4b DG |
1122 | } |
1123 | ||
1124 | error: | |
e7fe706f | 1125 | rcu_read_unlock(); |
2f77fc4b DG |
1126 | return ret; |
1127 | } | |
1128 | ||
9b6c7ec5 DG |
1129 | /* |
1130 | * Start a kernel session by opening all necessary streams. | |
1131 | */ | |
1132 | static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe) | |
1133 | { | |
1134 | int ret; | |
1135 | struct ltt_kernel_channel *kchan; | |
1136 | ||
1137 | /* Open kernel metadata */ | |
07b86b52 | 1138 | if (ksess->metadata == NULL && ksess->output_traces) { |
9b6c7ec5 DG |
1139 | ret = kernel_open_metadata(ksess); |
1140 | if (ret < 0) { | |
1141 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1142 | goto error; | |
1143 | } | |
1144 | } | |
1145 | ||
1146 | /* Open kernel metadata stream */ | |
07b86b52 | 1147 | if (ksess->metadata && ksess->metadata_stream_fd < 0) { |
9b6c7ec5 DG |
1148 | ret = kernel_open_metadata_stream(ksess); |
1149 | if (ret < 0) { | |
1150 | ERR("Kernel create metadata stream failed"); | |
1151 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1152 | goto error; | |
1153 | } | |
1154 | } | |
1155 | ||
1156 | /* For each channel */ | |
1157 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
1158 | if (kchan->stream_count == 0) { | |
1159 | ret = kernel_open_channel_stream(kchan); | |
1160 | if (ret < 0) { | |
1161 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1162 | goto error; | |
1163 | } | |
1164 | /* Update the stream global counter */ | |
1165 | ksess->stream_count_global += ret; | |
1166 | } | |
1167 | } | |
1168 | ||
1169 | /* Setup kernel consumer socket and send fds to it */ | |
1170 | ret = init_kernel_tracing(ksess); | |
e43c41c5 | 1171 | if (ret != 0) { |
9b6c7ec5 DG |
1172 | ret = LTTNG_ERR_KERN_START_FAIL; |
1173 | goto error; | |
1174 | } | |
1175 | ||
1176 | /* This start the kernel tracing */ | |
1177 | ret = kernel_start_session(ksess); | |
1178 | if (ret < 0) { | |
1179 | ret = LTTNG_ERR_KERN_START_FAIL; | |
1180 | goto error; | |
1181 | } | |
1182 | ||
1183 | /* Quiescent wait after starting trace */ | |
462ae7ae | 1184 | kernel_wait_quiescent(wpipe); |
9b6c7ec5 | 1185 | |
14fb1ebe | 1186 | ksess->active = 1; |
9b6c7ec5 DG |
1187 | |
1188 | ret = LTTNG_OK; | |
1189 | ||
1190 | error: | |
1191 | return ret; | |
1192 | } | |
1193 | ||
2f77fc4b DG |
1194 | /* |
1195 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. | |
1196 | */ | |
56a37563 JG |
1197 | int cmd_disable_channel(struct ltt_session *session, |
1198 | enum lttng_domain_type domain, char *channel_name) | |
2f77fc4b DG |
1199 | { |
1200 | int ret; | |
1201 | struct ltt_ust_session *usess; | |
1202 | ||
1203 | usess = session->ust_session; | |
1204 | ||
2223c96f DG |
1205 | rcu_read_lock(); |
1206 | ||
2f77fc4b DG |
1207 | switch (domain) { |
1208 | case LTTNG_DOMAIN_KERNEL: | |
1209 | { | |
1210 | ret = channel_kernel_disable(session->kernel_session, | |
1211 | channel_name); | |
f73fabfd | 1212 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1213 | goto error; |
1214 | } | |
1215 | ||
1216 | kernel_wait_quiescent(kernel_tracer_fd); | |
1217 | break; | |
1218 | } | |
1219 | case LTTNG_DOMAIN_UST: | |
1220 | { | |
1221 | struct ltt_ust_channel *uchan; | |
1222 | struct lttng_ht *chan_ht; | |
1223 | ||
1224 | chan_ht = usess->domain_global.channels; | |
1225 | ||
1226 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
1227 | if (uchan == NULL) { | |
f73fabfd | 1228 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
1229 | goto error; |
1230 | } | |
1231 | ||
7972aab2 | 1232 | ret = channel_ust_disable(usess, uchan); |
f73fabfd | 1233 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1234 | goto error; |
1235 | } | |
1236 | break; | |
1237 | } | |
2f77fc4b | 1238 | default: |
f73fabfd | 1239 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1240 | goto error; |
1241 | } | |
1242 | ||
f73fabfd | 1243 | ret = LTTNG_OK; |
2f77fc4b DG |
1244 | |
1245 | error: | |
2223c96f | 1246 | rcu_read_unlock(); |
2f77fc4b DG |
1247 | return ret; |
1248 | } | |
1249 | ||
ccf10263 MD |
1250 | /* |
1251 | * Command LTTNG_TRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1252 | * |
1253 | * Called with session lock held. | |
ccf10263 | 1254 | */ |
56a37563 JG |
1255 | int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1256 | int pid) | |
ccf10263 MD |
1257 | { |
1258 | int ret; | |
1259 | ||
1260 | rcu_read_lock(); | |
1261 | ||
1262 | switch (domain) { | |
1263 | case LTTNG_DOMAIN_KERNEL: | |
1264 | { | |
1265 | struct ltt_kernel_session *ksess; | |
1266 | ||
1267 | ksess = session->kernel_session; | |
1268 | ||
1269 | ret = kernel_track_pid(ksess, pid); | |
1270 | if (ret != LTTNG_OK) { | |
1271 | goto error; | |
1272 | } | |
1273 | ||
1274 | kernel_wait_quiescent(kernel_tracer_fd); | |
1275 | break; | |
1276 | } | |
ccf10263 | 1277 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1278 | { |
1279 | struct ltt_ust_session *usess; | |
1280 | ||
1281 | usess = session->ust_session; | |
1282 | ||
1283 | ret = trace_ust_track_pid(usess, pid); | |
1284 | if (ret != LTTNG_OK) { | |
1285 | goto error; | |
1286 | } | |
1287 | break; | |
1288 | } | |
ccf10263 MD |
1289 | default: |
1290 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1291 | goto error; | |
1292 | } | |
1293 | ||
1294 | ret = LTTNG_OK; | |
1295 | ||
1296 | error: | |
1297 | rcu_read_unlock(); | |
1298 | return ret; | |
1299 | } | |
1300 | ||
1301 | /* | |
1302 | * Command LTTNG_UNTRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1303 | * |
1304 | * Called with session lock held. | |
ccf10263 | 1305 | */ |
56a37563 JG |
1306 | int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1307 | int pid) | |
ccf10263 MD |
1308 | { |
1309 | int ret; | |
1310 | ||
1311 | rcu_read_lock(); | |
1312 | ||
1313 | switch (domain) { | |
1314 | case LTTNG_DOMAIN_KERNEL: | |
1315 | { | |
1316 | struct ltt_kernel_session *ksess; | |
1317 | ||
1318 | ksess = session->kernel_session; | |
1319 | ||
1320 | ret = kernel_untrack_pid(ksess, pid); | |
1321 | if (ret != LTTNG_OK) { | |
1322 | goto error; | |
1323 | } | |
1324 | ||
1325 | kernel_wait_quiescent(kernel_tracer_fd); | |
1326 | break; | |
1327 | } | |
ccf10263 | 1328 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1329 | { |
1330 | struct ltt_ust_session *usess; | |
1331 | ||
1332 | usess = session->ust_session; | |
1333 | ||
1334 | ret = trace_ust_untrack_pid(usess, pid); | |
1335 | if (ret != LTTNG_OK) { | |
1336 | goto error; | |
1337 | } | |
1338 | break; | |
1339 | } | |
ccf10263 MD |
1340 | default: |
1341 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1342 | goto error; | |
1343 | } | |
1344 | ||
1345 | ret = LTTNG_OK; | |
1346 | ||
1347 | error: | |
1348 | rcu_read_unlock(); | |
1349 | return ret; | |
1350 | } | |
1351 | ||
2f77fc4b DG |
1352 | /* |
1353 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
1354 | * | |
1355 | * The wpipe arguments is used as a notifier for the kernel thread. | |
1356 | */ | |
1357 | int cmd_enable_channel(struct ltt_session *session, | |
7972aab2 | 1358 | struct lttng_domain *domain, struct lttng_channel *attr, int wpipe) |
2f77fc4b DG |
1359 | { |
1360 | int ret; | |
1361 | struct ltt_ust_session *usess = session->ust_session; | |
1362 | struct lttng_ht *chan_ht; | |
1f345e94 | 1363 | size_t len; |
2f77fc4b DG |
1364 | |
1365 | assert(session); | |
1366 | assert(attr); | |
7972aab2 | 1367 | assert(domain); |
2f77fc4b | 1368 | |
f5436bfc | 1369 | len = lttng_strnlen(attr->name, sizeof(attr->name)); |
1f345e94 PP |
1370 | |
1371 | /* Validate channel name */ | |
1372 | if (attr->name[0] == '.' || | |
1373 | memchr(attr->name, '/', len) != NULL) { | |
1374 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1375 | goto end; | |
1376 | } | |
1377 | ||
2f77fc4b DG |
1378 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
1379 | ||
03b4fdcf DG |
1380 | rcu_read_lock(); |
1381 | ||
ecc48a90 JD |
1382 | /* |
1383 | * Don't try to enable a channel if the session has been started at | |
1384 | * some point in time before. The tracer does not allow it. | |
1385 | */ | |
8382cf6f | 1386 | if (session->has_been_started) { |
ecc48a90 JD |
1387 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
1388 | goto error; | |
1389 | } | |
1390 | ||
1391 | /* | |
1392 | * If the session is a live session, remove the switch timer, the | |
1393 | * live timer does the same thing but sends also synchronisation | |
1394 | * beacons for inactive streams. | |
1395 | */ | |
1396 | if (session->live_timer > 0) { | |
1397 | attr->attr.live_timer_interval = session->live_timer; | |
1398 | attr->attr.switch_timer_interval = 0; | |
1399 | } | |
1400 | ||
6e21424e JR |
1401 | /* Check for feature support */ |
1402 | switch (domain->type) { | |
1403 | case LTTNG_DOMAIN_KERNEL: | |
1404 | { | |
1405 | if (kernel_supports_ring_buffer_snapshot_sample_positions(kernel_tracer_fd) != 1) { | |
1406 | /* Sampling position of buffer is not supported */ | |
1407 | WARN("Kernel tracer does not support buffer monitoring. " | |
1408 | "Setting the monitor interval timer to 0 " | |
1409 | "(disabled) for channel '%s' of session '%s'", | |
1410 | attr-> name, session->name); | |
1411 | lttng_channel_set_monitor_timer_interval(attr, 0); | |
1412 | } | |
1413 | break; | |
1414 | } | |
1415 | case LTTNG_DOMAIN_UST: | |
f28f9e44 | 1416 | break; |
6e21424e JR |
1417 | case LTTNG_DOMAIN_JUL: |
1418 | case LTTNG_DOMAIN_LOG4J: | |
1419 | case LTTNG_DOMAIN_PYTHON: | |
f28f9e44 JG |
1420 | if (!agent_tracing_is_enabled()) { |
1421 | DBG("Attempted to enable a channel in an agent domain but the agent thread is not running"); | |
1422 | ret = LTTNG_ERR_AGENT_TRACING_DISABLED; | |
1423 | goto error; | |
1424 | } | |
6e21424e JR |
1425 | break; |
1426 | default: | |
1427 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1428 | goto error; | |
1429 | } | |
1430 | ||
7972aab2 | 1431 | switch (domain->type) { |
2f77fc4b DG |
1432 | case LTTNG_DOMAIN_KERNEL: |
1433 | { | |
1434 | struct ltt_kernel_channel *kchan; | |
1435 | ||
2f77fc4b DG |
1436 | kchan = trace_kernel_get_channel_by_name(attr->name, |
1437 | session->kernel_session); | |
1438 | if (kchan == NULL) { | |
1439 | ret = channel_kernel_create(session->kernel_session, attr, wpipe); | |
85076754 MD |
1440 | if (attr->name[0] != '\0') { |
1441 | session->kernel_session->has_non_default_channel = 1; | |
1442 | } | |
2f77fc4b DG |
1443 | } else { |
1444 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
1445 | } | |
1446 | ||
f73fabfd | 1447 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1448 | goto error; |
1449 | } | |
1450 | ||
784303b0 | 1451 | kernel_wait_quiescent(kernel_tracer_fd); |
2f77fc4b DG |
1452 | break; |
1453 | } | |
1454 | case LTTNG_DOMAIN_UST: | |
9232818f JG |
1455 | case LTTNG_DOMAIN_JUL: |
1456 | case LTTNG_DOMAIN_LOG4J: | |
1457 | case LTTNG_DOMAIN_PYTHON: | |
2f77fc4b DG |
1458 | { |
1459 | struct ltt_ust_channel *uchan; | |
1460 | ||
9232818f JG |
1461 | /* |
1462 | * FIXME | |
1463 | * | |
1464 | * Current agent implementation limitations force us to allow | |
1465 | * only one channel at once in "agent" subdomains. Each | |
1466 | * subdomain has a default channel name which must be strictly | |
1467 | * adhered to. | |
1468 | */ | |
1469 | if (domain->type == LTTNG_DOMAIN_JUL) { | |
1470 | if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME, | |
1471 | LTTNG_SYMBOL_NAME_LEN)) { | |
1472 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1473 | goto error; | |
1474 | } | |
1475 | } else if (domain->type == LTTNG_DOMAIN_LOG4J) { | |
1476 | if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME, | |
1477 | LTTNG_SYMBOL_NAME_LEN)) { | |
1478 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1479 | goto error; | |
1480 | } | |
1481 | } else if (domain->type == LTTNG_DOMAIN_PYTHON) { | |
1482 | if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME, | |
1483 | LTTNG_SYMBOL_NAME_LEN)) { | |
1484 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1485 | goto error; | |
1486 | } | |
1487 | } | |
1488 | ||
2f77fc4b DG |
1489 | chan_ht = usess->domain_global.channels; |
1490 | ||
1491 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); | |
1492 | if (uchan == NULL) { | |
7972aab2 | 1493 | ret = channel_ust_create(usess, attr, domain->buf_type); |
85076754 MD |
1494 | if (attr->name[0] != '\0') { |
1495 | usess->has_non_default_channel = 1; | |
1496 | } | |
2f77fc4b | 1497 | } else { |
7972aab2 | 1498 | ret = channel_ust_enable(usess, uchan); |
2f77fc4b DG |
1499 | } |
1500 | break; | |
1501 | } | |
2f77fc4b | 1502 | default: |
f73fabfd | 1503 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1504 | goto error; |
1505 | } | |
1506 | ||
1507 | error: | |
2223c96f | 1508 | rcu_read_unlock(); |
1f345e94 | 1509 | end: |
2f77fc4b DG |
1510 | return ret; |
1511 | } | |
1512 | ||
2f77fc4b DG |
1513 | /* |
1514 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1515 | */ | |
56a37563 JG |
1516 | int cmd_disable_event(struct ltt_session *session, |
1517 | enum lttng_domain_type domain, char *channel_name, | |
6e911cad | 1518 | struct lttng_event *event) |
2f77fc4b DG |
1519 | { |
1520 | int ret; | |
6e911cad MD |
1521 | char *event_name; |
1522 | ||
18a720cd MD |
1523 | DBG("Disable event command for event \'%s\'", event->name); |
1524 | ||
6e911cad MD |
1525 | event_name = event->name; |
1526 | ||
9b7431cf JG |
1527 | /* Error out on unhandled search criteria */ |
1528 | if (event->loglevel_type || event->loglevel != -1 || event->enabled | |
6e911cad | 1529 | || event->pid || event->filter || event->exclusion) { |
7076b56e JG |
1530 | ret = LTTNG_ERR_UNK; |
1531 | goto error; | |
6e911cad | 1532 | } |
2f77fc4b | 1533 | |
2223c96f DG |
1534 | rcu_read_lock(); |
1535 | ||
2f77fc4b DG |
1536 | switch (domain) { |
1537 | case LTTNG_DOMAIN_KERNEL: | |
1538 | { | |
1539 | struct ltt_kernel_channel *kchan; | |
1540 | struct ltt_kernel_session *ksess; | |
1541 | ||
1542 | ksess = session->kernel_session; | |
1543 | ||
85076754 MD |
1544 | /* |
1545 | * If a non-default channel has been created in the | |
1546 | * session, explicitely require that -c chan_name needs | |
1547 | * to be provided. | |
1548 | */ | |
1549 | if (ksess->has_non_default_channel && channel_name[0] == '\0') { | |
1550 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1551 | goto error_unlock; |
85076754 MD |
1552 | } |
1553 | ||
2f77fc4b DG |
1554 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
1555 | if (kchan == NULL) { | |
f73fabfd | 1556 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
7076b56e | 1557 | goto error_unlock; |
2f77fc4b DG |
1558 | } |
1559 | ||
6e911cad MD |
1560 | switch (event->type) { |
1561 | case LTTNG_EVENT_ALL: | |
9550ee81 | 1562 | case LTTNG_EVENT_TRACEPOINT: |
d0ae4ea8 | 1563 | case LTTNG_EVENT_SYSCALL: |
9550ee81 JR |
1564 | case LTTNG_EVENT_PROBE: |
1565 | case LTTNG_EVENT_FUNCTION: | |
1566 | case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */ | |
1567 | if (event_name[0] == '\0') { | |
1568 | ret = event_kernel_disable_event(kchan, | |
1569 | NULL, event->type); | |
29c62722 | 1570 | } else { |
d0ae4ea8 | 1571 | ret = event_kernel_disable_event(kchan, |
9550ee81 | 1572 | event_name, event->type); |
29c62722 | 1573 | } |
6e911cad | 1574 | if (ret != LTTNG_OK) { |
7076b56e | 1575 | goto error_unlock; |
6e911cad MD |
1576 | } |
1577 | break; | |
6e911cad MD |
1578 | default: |
1579 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1580 | goto error_unlock; |
2f77fc4b DG |
1581 | } |
1582 | ||
1583 | kernel_wait_quiescent(kernel_tracer_fd); | |
1584 | break; | |
1585 | } | |
1586 | case LTTNG_DOMAIN_UST: | |
1587 | { | |
1588 | struct ltt_ust_channel *uchan; | |
1589 | struct ltt_ust_session *usess; | |
1590 | ||
1591 | usess = session->ust_session; | |
1592 | ||
7076b56e JG |
1593 | if (validate_ust_event_name(event_name)) { |
1594 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1595 | goto error_unlock; | |
1596 | } | |
1597 | ||
85076754 MD |
1598 | /* |
1599 | * If a non-default channel has been created in the | |
9550ee81 | 1600 | * session, explicitly require that -c chan_name needs |
85076754 MD |
1601 | * to be provided. |
1602 | */ | |
1603 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1604 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1605 | goto error_unlock; |
85076754 MD |
1606 | } |
1607 | ||
2f77fc4b DG |
1608 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
1609 | channel_name); | |
1610 | if (uchan == NULL) { | |
f73fabfd | 1611 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
7076b56e | 1612 | goto error_unlock; |
2f77fc4b DG |
1613 | } |
1614 | ||
6e911cad MD |
1615 | switch (event->type) { |
1616 | case LTTNG_EVENT_ALL: | |
b3639870 JR |
1617 | /* |
1618 | * An empty event name means that everything | |
1619 | * should be disabled. | |
1620 | */ | |
1621 | if (event->name[0] == '\0') { | |
1622 | ret = event_ust_disable_all_tracepoints(usess, uchan); | |
77d536b2 JR |
1623 | } else { |
1624 | ret = event_ust_disable_tracepoint(usess, uchan, | |
1625 | event_name); | |
1626 | } | |
6e911cad | 1627 | if (ret != LTTNG_OK) { |
7076b56e | 1628 | goto error_unlock; |
6e911cad MD |
1629 | } |
1630 | break; | |
1631 | default: | |
1632 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1633 | goto error_unlock; |
2f77fc4b DG |
1634 | } |
1635 | ||
1636 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
1637 | channel_name); | |
1638 | break; | |
1639 | } | |
5cdb6027 | 1640 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1641 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1642 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1643 | { |
fefd409b | 1644 | struct agent *agt; |
f20baf8e DG |
1645 | struct ltt_ust_session *usess = session->ust_session; |
1646 | ||
1647 | assert(usess); | |
1648 | ||
6e911cad MD |
1649 | switch (event->type) { |
1650 | case LTTNG_EVENT_ALL: | |
1651 | break; | |
1652 | default: | |
1653 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1654 | goto error_unlock; |
6e911cad MD |
1655 | } |
1656 | ||
5cdb6027 | 1657 | agt = trace_ust_find_agent(usess, domain); |
fefd409b DG |
1658 | if (!agt) { |
1659 | ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
7076b56e | 1660 | goto error_unlock; |
fefd409b | 1661 | } |
b3639870 JR |
1662 | /* |
1663 | * An empty event name means that everything | |
1664 | * should be disabled. | |
1665 | */ | |
1666 | if (event->name[0] == '\0') { | |
18a720cd MD |
1667 | ret = event_agent_disable_all(usess, agt); |
1668 | } else { | |
1669 | ret = event_agent_disable(usess, agt, event_name); | |
1670 | } | |
f20baf8e | 1671 | if (ret != LTTNG_OK) { |
7076b56e | 1672 | goto error_unlock; |
f20baf8e DG |
1673 | } |
1674 | ||
1675 | break; | |
1676 | } | |
2f77fc4b | 1677 | default: |
f73fabfd | 1678 | ret = LTTNG_ERR_UND; |
7076b56e | 1679 | goto error_unlock; |
2f77fc4b DG |
1680 | } |
1681 | ||
f73fabfd | 1682 | ret = LTTNG_OK; |
2f77fc4b | 1683 | |
7076b56e | 1684 | error_unlock: |
2223c96f | 1685 | rcu_read_unlock(); |
7076b56e | 1686 | error: |
2f77fc4b DG |
1687 | return ret; |
1688 | } | |
1689 | ||
2f77fc4b DG |
1690 | /* |
1691 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1692 | */ | |
56a37563 | 1693 | int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain, |
601d5acf | 1694 | char *channel_name, struct lttng_event_context *ctx, int kwpipe) |
2f77fc4b | 1695 | { |
d5979e4a | 1696 | int ret, chan_kern_created = 0, chan_ust_created = 0; |
bdf64013 JG |
1697 | char *app_ctx_provider_name = NULL, *app_ctx_name = NULL; |
1698 | ||
9a699f7b JR |
1699 | /* |
1700 | * Don't try to add a context if the session has been started at | |
1701 | * some point in time before. The tracer does not allow it and would | |
1702 | * result in a corrupted trace. | |
1703 | */ | |
1704 | if (session->has_been_started) { | |
1705 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; | |
1706 | goto end; | |
1707 | } | |
1708 | ||
bdf64013 JG |
1709 | if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) { |
1710 | app_ctx_provider_name = ctx->u.app_ctx.provider_name; | |
1711 | app_ctx_name = ctx->u.app_ctx.ctx_name; | |
1712 | } | |
2f77fc4b DG |
1713 | |
1714 | switch (domain) { | |
1715 | case LTTNG_DOMAIN_KERNEL: | |
979e618e DG |
1716 | assert(session->kernel_session); |
1717 | ||
1718 | if (session->kernel_session->channel_count == 0) { | |
1719 | /* Create default channel */ | |
1720 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); | |
1721 | if (ret != LTTNG_OK) { | |
1722 | goto error; | |
1723 | } | |
d5979e4a | 1724 | chan_kern_created = 1; |
979e618e | 1725 | } |
2f77fc4b | 1726 | /* Add kernel context to kernel tracer */ |
601d5acf | 1727 | ret = context_kernel_add(session->kernel_session, ctx, channel_name); |
f73fabfd | 1728 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1729 | goto error; |
1730 | } | |
1731 | break; | |
bdf64013 JG |
1732 | case LTTNG_DOMAIN_JUL: |
1733 | case LTTNG_DOMAIN_LOG4J: | |
1734 | { | |
1735 | /* | |
1736 | * Validate channel name. | |
1737 | * If no channel name is given and the domain is JUL or LOG4J, | |
1738 | * set it to the appropriate domain-specific channel name. If | |
1739 | * a name is provided but does not match the expexted channel | |
1740 | * name, return an error. | |
1741 | */ | |
1742 | if (domain == LTTNG_DOMAIN_JUL && *channel_name && | |
1743 | strcmp(channel_name, | |
1744 | DEFAULT_JUL_CHANNEL_NAME)) { | |
1745 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1746 | goto error; | |
1747 | } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name && | |
1748 | strcmp(channel_name, | |
1749 | DEFAULT_LOG4J_CHANNEL_NAME)) { | |
1750 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1751 | goto error; | |
1752 | } | |
a93b3916 | 1753 | /* break is _not_ missing here. */ |
bdf64013 | 1754 | } |
2f77fc4b DG |
1755 | case LTTNG_DOMAIN_UST: |
1756 | { | |
1757 | struct ltt_ust_session *usess = session->ust_session; | |
85076754 MD |
1758 | unsigned int chan_count; |
1759 | ||
2f77fc4b DG |
1760 | assert(usess); |
1761 | ||
85076754 | 1762 | chan_count = lttng_ht_get_count(usess->domain_global.channels); |
979e618e DG |
1763 | if (chan_count == 0) { |
1764 | struct lttng_channel *attr; | |
1765 | /* Create default channel */ | |
0a9c6494 | 1766 | attr = channel_new_default_attr(domain, usess->buffer_type); |
979e618e DG |
1767 | if (attr == NULL) { |
1768 | ret = LTTNG_ERR_FATAL; | |
1769 | goto error; | |
1770 | } | |
1771 | ||
7972aab2 | 1772 | ret = channel_ust_create(usess, attr, usess->buffer_type); |
979e618e DG |
1773 | if (ret != LTTNG_OK) { |
1774 | free(attr); | |
1775 | goto error; | |
1776 | } | |
cf0bcb51 | 1777 | channel_attr_destroy(attr); |
d5979e4a | 1778 | chan_ust_created = 1; |
979e618e DG |
1779 | } |
1780 | ||
601d5acf | 1781 | ret = context_ust_add(usess, domain, ctx, channel_name); |
bdf64013 JG |
1782 | free(app_ctx_provider_name); |
1783 | free(app_ctx_name); | |
1784 | app_ctx_name = NULL; | |
1785 | app_ctx_provider_name = NULL; | |
f73fabfd | 1786 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1787 | goto error; |
1788 | } | |
1789 | break; | |
1790 | } | |
2f77fc4b | 1791 | default: |
f73fabfd | 1792 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1793 | goto error; |
1794 | } | |
1795 | ||
bdf64013 JG |
1796 | ret = LTTNG_OK; |
1797 | goto end; | |
2f77fc4b DG |
1798 | |
1799 | error: | |
d5979e4a DG |
1800 | if (chan_kern_created) { |
1801 | struct ltt_kernel_channel *kchan = | |
1802 | trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME, | |
1803 | session->kernel_session); | |
1804 | /* Created previously, this should NOT fail. */ | |
1805 | assert(kchan); | |
1806 | kernel_destroy_channel(kchan); | |
1807 | } | |
1808 | ||
1809 | if (chan_ust_created) { | |
1810 | struct ltt_ust_channel *uchan = | |
1811 | trace_ust_find_channel_by_name( | |
1812 | session->ust_session->domain_global.channels, | |
1813 | DEFAULT_CHANNEL_NAME); | |
1814 | /* Created previously, this should NOT fail. */ | |
1815 | assert(uchan); | |
1816 | /* Remove from the channel list of the session. */ | |
1817 | trace_ust_delete_channel(session->ust_session->domain_global.channels, | |
1818 | uchan); | |
1819 | trace_ust_destroy_channel(uchan); | |
1820 | } | |
bdf64013 JG |
1821 | end: |
1822 | free(app_ctx_provider_name); | |
1823 | free(app_ctx_name); | |
2f77fc4b DG |
1824 | return ret; |
1825 | } | |
1826 | ||
dac8e046 JG |
1827 | static inline bool name_starts_with(const char *name, const char *prefix) |
1828 | { | |
1829 | const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN); | |
1830 | ||
1831 | return !strncmp(name, prefix, max_cmp_len); | |
1832 | } | |
1833 | ||
1834 | /* Perform userspace-specific event name validation */ | |
1835 | static int validate_ust_event_name(const char *name) | |
1836 | { | |
1837 | int ret = 0; | |
1838 | ||
1839 | if (!name) { | |
1840 | ret = -1; | |
1841 | goto end; | |
1842 | } | |
1843 | ||
1844 | /* | |
1845 | * Check name against all internal UST event component namespaces used | |
1846 | * by the agents. | |
1847 | */ | |
1848 | if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) || | |
1849 | name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) || | |
1850 | name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) { | |
1851 | ret = -1; | |
1852 | } | |
1853 | ||
1854 | end: | |
1855 | return ret; | |
1856 | } | |
88f06f15 | 1857 | |
2f77fc4b | 1858 | /* |
88f06f15 JG |
1859 | * Internal version of cmd_enable_event() with a supplemental |
1860 | * "internal_event" flag which is used to enable internal events which should | |
1861 | * be hidden from clients. Such events are used in the agent implementation to | |
1862 | * enable the events through which all "agent" events are funeled. | |
2f77fc4b | 1863 | */ |
88f06f15 JG |
1864 | static int _cmd_enable_event(struct ltt_session *session, |
1865 | struct lttng_domain *domain, | |
025faf73 | 1866 | char *channel_name, struct lttng_event *event, |
6b453b5e | 1867 | char *filter_expression, |
db8f1377 JI |
1868 | struct lttng_filter_bytecode *filter, |
1869 | struct lttng_event_exclusion *exclusion, | |
88f06f15 | 1870 | int wpipe, bool internal_event) |
2f77fc4b | 1871 | { |
9f449915 | 1872 | int ret = 0, channel_created = 0; |
cfedea03 | 1873 | struct lttng_channel *attr = NULL; |
2f77fc4b DG |
1874 | |
1875 | assert(session); | |
1876 | assert(event); | |
1877 | assert(channel_name); | |
1878 | ||
2a385866 JG |
1879 | /* If we have a filter, we must have its filter expression */ |
1880 | assert(!(!!filter_expression ^ !!filter)); | |
1881 | ||
9f449915 PP |
1882 | /* Normalize event name as a globbing pattern */ |
1883 | strutils_normalize_star_glob_pattern(event->name); | |
18a720cd | 1884 | |
9f449915 PP |
1885 | /* Normalize exclusion names as globbing patterns */ |
1886 | if (exclusion) { | |
1887 | size_t i; | |
f5ac4bd7 | 1888 | |
9f449915 PP |
1889 | for (i = 0; i < exclusion->count; i++) { |
1890 | char *name = LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i); | |
1891 | ||
1892 | strutils_normalize_star_glob_pattern(name); | |
1893 | } | |
930a2e99 JG |
1894 | } |
1895 | ||
9f449915 PP |
1896 | DBG("Enable event command for event \'%s\'", event->name); |
1897 | ||
1898 | rcu_read_lock(); | |
1899 | ||
7972aab2 | 1900 | switch (domain->type) { |
2f77fc4b DG |
1901 | case LTTNG_DOMAIN_KERNEL: |
1902 | { | |
1903 | struct ltt_kernel_channel *kchan; | |
1904 | ||
85076754 MD |
1905 | /* |
1906 | * If a non-default channel has been created in the | |
1907 | * session, explicitely require that -c chan_name needs | |
1908 | * to be provided. | |
1909 | */ | |
1910 | if (session->kernel_session->has_non_default_channel | |
1911 | && channel_name[0] == '\0') { | |
1912 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1913 | goto error; | |
1914 | } | |
1915 | ||
2f77fc4b DG |
1916 | kchan = trace_kernel_get_channel_by_name(channel_name, |
1917 | session->kernel_session); | |
1918 | if (kchan == NULL) { | |
0a9c6494 DG |
1919 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
1920 | LTTNG_BUFFER_GLOBAL); | |
2f77fc4b | 1921 | if (attr == NULL) { |
f73fabfd | 1922 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1923 | goto error; |
1924 | } | |
04c17253 MD |
1925 | if (lttng_strncpy(attr->name, channel_name, |
1926 | sizeof(attr->name))) { | |
1927 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
1928 | goto error; |
1929 | } | |
2f77fc4b DG |
1930 | |
1931 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 1932 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1933 | goto error; |
1934 | } | |
e5f5db7f | 1935 | channel_created = 1; |
2f77fc4b DG |
1936 | } |
1937 | ||
1938 | /* Get the newly created kernel channel pointer */ | |
1939 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1940 | session->kernel_session); | |
1941 | if (kchan == NULL) { | |
1942 | /* This sould not happen... */ | |
f73fabfd | 1943 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
1944 | goto error; |
1945 | } | |
1946 | ||
6e911cad MD |
1947 | switch (event->type) { |
1948 | case LTTNG_EVENT_ALL: | |
29c62722 | 1949 | { |
00a62084 MD |
1950 | char *filter_expression_a = NULL; |
1951 | struct lttng_filter_bytecode *filter_a = NULL; | |
1952 | ||
1953 | /* | |
1954 | * We need to duplicate filter_expression and filter, | |
1955 | * because ownership is passed to first enable | |
1956 | * event. | |
1957 | */ | |
1958 | if (filter_expression) { | |
1959 | filter_expression_a = strdup(filter_expression); | |
1960 | if (!filter_expression_a) { | |
1961 | ret = LTTNG_ERR_FATAL; | |
1962 | goto error; | |
1963 | } | |
1964 | } | |
1965 | if (filter) { | |
1966 | filter_a = zmalloc(sizeof(*filter_a) + filter->len); | |
1967 | if (!filter_a) { | |
1968 | free(filter_expression_a); | |
1969 | ret = LTTNG_ERR_FATAL; | |
1970 | goto error; | |
1971 | } | |
1972 | memcpy(filter_a, filter, sizeof(*filter_a) + filter->len); | |
1973 | } | |
29c62722 | 1974 | event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */ |
00a62084 MD |
1975 | ret = event_kernel_enable_event(kchan, event, |
1976 | filter_expression, filter); | |
a969e101 MD |
1977 | /* We have passed ownership */ |
1978 | filter_expression = NULL; | |
1979 | filter = NULL; | |
29c62722 MD |
1980 | if (ret != LTTNG_OK) { |
1981 | if (channel_created) { | |
1982 | /* Let's not leak a useless channel. */ | |
1983 | kernel_destroy_channel(kchan); | |
1984 | } | |
00a62084 MD |
1985 | free(filter_expression_a); |
1986 | free(filter_a); | |
29c62722 MD |
1987 | goto error; |
1988 | } | |
1989 | event->type = LTTNG_EVENT_SYSCALL; /* Hack */ | |
00a62084 MD |
1990 | ret = event_kernel_enable_event(kchan, event, |
1991 | filter_expression_a, filter_a); | |
60d21fa2 AB |
1992 | /* We have passed ownership */ |
1993 | filter_expression_a = NULL; | |
1994 | filter_a = NULL; | |
29c62722 MD |
1995 | if (ret != LTTNG_OK) { |
1996 | goto error; | |
1997 | } | |
1998 | break; | |
1999 | } | |
6e6ef3d7 DG |
2000 | case LTTNG_EVENT_PROBE: |
2001 | case LTTNG_EVENT_FUNCTION: | |
2002 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
6e911cad | 2003 | case LTTNG_EVENT_TRACEPOINT: |
00a62084 MD |
2004 | ret = event_kernel_enable_event(kchan, event, |
2005 | filter_expression, filter); | |
a969e101 MD |
2006 | /* We have passed ownership */ |
2007 | filter_expression = NULL; | |
2008 | filter = NULL; | |
6e911cad MD |
2009 | if (ret != LTTNG_OK) { |
2010 | if (channel_created) { | |
2011 | /* Let's not leak a useless channel. */ | |
2012 | kernel_destroy_channel(kchan); | |
2013 | } | |
2014 | goto error; | |
e5f5db7f | 2015 | } |
6e911cad MD |
2016 | break; |
2017 | case LTTNG_EVENT_SYSCALL: | |
00a62084 MD |
2018 | ret = event_kernel_enable_event(kchan, event, |
2019 | filter_expression, filter); | |
a969e101 MD |
2020 | /* We have passed ownership */ |
2021 | filter_expression = NULL; | |
2022 | filter = NULL; | |
e2b957af MD |
2023 | if (ret != LTTNG_OK) { |
2024 | goto error; | |
2025 | } | |
6e911cad MD |
2026 | break; |
2027 | default: | |
2028 | ret = LTTNG_ERR_UNK; | |
2f77fc4b DG |
2029 | goto error; |
2030 | } | |
2031 | ||
2032 | kernel_wait_quiescent(kernel_tracer_fd); | |
2033 | break; | |
2034 | } | |
2035 | case LTTNG_DOMAIN_UST: | |
2036 | { | |
2037 | struct ltt_ust_channel *uchan; | |
2038 | struct ltt_ust_session *usess = session->ust_session; | |
2039 | ||
2040 | assert(usess); | |
2041 | ||
85076754 MD |
2042 | /* |
2043 | * If a non-default channel has been created in the | |
2044 | * session, explicitely require that -c chan_name needs | |
2045 | * to be provided. | |
2046 | */ | |
2047 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
2048 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
2049 | goto error; | |
2050 | } | |
2051 | ||
2f77fc4b DG |
2052 | /* Get channel from global UST domain */ |
2053 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2054 | channel_name); | |
2055 | if (uchan == NULL) { | |
2056 | /* Create default channel */ | |
0a9c6494 DG |
2057 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
2058 | usess->buffer_type); | |
2f77fc4b | 2059 | if (attr == NULL) { |
f73fabfd | 2060 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2061 | goto error; |
2062 | } | |
04c17253 MD |
2063 | if (lttng_strncpy(attr->name, channel_name, |
2064 | sizeof(attr->name))) { | |
2065 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
2066 | goto error; |
2067 | } | |
2f77fc4b DG |
2068 | |
2069 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 2070 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2071 | goto error; |
2072 | } | |
2f77fc4b DG |
2073 | |
2074 | /* Get the newly created channel reference back */ | |
2075 | uchan = trace_ust_find_channel_by_name( | |
2076 | usess->domain_global.channels, channel_name); | |
2077 | assert(uchan); | |
2078 | } | |
2079 | ||
141feb8c JG |
2080 | if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) { |
2081 | /* | |
2082 | * Don't allow users to add UST events to channels which | |
2083 | * are assigned to a userspace subdomain (JUL, Log4J, | |
2084 | * Python, etc.). | |
2085 | */ | |
2086 | ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN; | |
2087 | goto error; | |
2088 | } | |
2089 | ||
dac8e046 JG |
2090 | if (!internal_event) { |
2091 | /* | |
2092 | * Ensure the event name is not reserved for internal | |
2093 | * use. | |
2094 | */ | |
2095 | ret = validate_ust_event_name(event->name); | |
2096 | if (ret) { | |
2097 | WARN("Userspace event name %s failed validation.", | |
bbcab087 | 2098 | event->name); |
dac8e046 JG |
2099 | ret = LTTNG_ERR_INVALID_EVENT_NAME; |
2100 | goto error; | |
2101 | } | |
2102 | } | |
2103 | ||
2f77fc4b | 2104 | /* At this point, the session and channel exist on the tracer */ |
6b453b5e | 2105 | ret = event_ust_enable_tracepoint(usess, uchan, event, |
88f06f15 JG |
2106 | filter_expression, filter, exclusion, |
2107 | internal_event); | |
49d21f93 MD |
2108 | /* We have passed ownership */ |
2109 | filter_expression = NULL; | |
2110 | filter = NULL; | |
2111 | exclusion = NULL; | |
94382e15 JG |
2112 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2113 | goto already_enabled; | |
2114 | } else if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2115 | goto error; |
2116 | } | |
2117 | break; | |
2118 | } | |
5cdb6027 | 2119 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 2120 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2121 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 2122 | { |
da6c3a50 | 2123 | const char *default_event_name, *default_chan_name; |
fefd409b | 2124 | struct agent *agt; |
f20baf8e DG |
2125 | struct lttng_event uevent; |
2126 | struct lttng_domain tmp_dom; | |
2127 | struct ltt_ust_session *usess = session->ust_session; | |
2128 | ||
2129 | assert(usess); | |
2130 | ||
f28f9e44 JG |
2131 | if (!agent_tracing_is_enabled()) { |
2132 | DBG("Attempted to enable an event in an agent domain but the agent thread is not running"); | |
2133 | ret = LTTNG_ERR_AGENT_TRACING_DISABLED; | |
2134 | goto error; | |
2135 | } | |
2136 | ||
5cdb6027 | 2137 | agt = trace_ust_find_agent(usess, domain->type); |
fefd409b | 2138 | if (!agt) { |
5cdb6027 | 2139 | agt = agent_create(domain->type); |
fefd409b | 2140 | if (!agt) { |
e5b3c48c | 2141 | ret = LTTNG_ERR_NOMEM; |
fefd409b DG |
2142 | goto error; |
2143 | } | |
2144 | agent_add(agt, usess->agents); | |
2145 | } | |
2146 | ||
022d91ba | 2147 | /* Create the default tracepoint. */ |
996de3c7 | 2148 | memset(&uevent, 0, sizeof(uevent)); |
f20baf8e DG |
2149 | uevent.type = LTTNG_EVENT_TRACEPOINT; |
2150 | uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
51755dc8 JG |
2151 | default_event_name = event_get_default_agent_ust_name( |
2152 | domain->type); | |
da6c3a50 | 2153 | if (!default_event_name) { |
e5b3c48c | 2154 | ret = LTTNG_ERR_FATAL; |
da6c3a50 | 2155 | goto error; |
f43f95a9 | 2156 | } |
da6c3a50 | 2157 | strncpy(uevent.name, default_event_name, sizeof(uevent.name)); |
f20baf8e DG |
2158 | uevent.name[sizeof(uevent.name) - 1] = '\0'; |
2159 | ||
2160 | /* | |
2161 | * The domain type is changed because we are about to enable the | |
2162 | * default channel and event for the JUL domain that are hardcoded. | |
2163 | * This happens in the UST domain. | |
2164 | */ | |
2165 | memcpy(&tmp_dom, domain, sizeof(tmp_dom)); | |
2166 | tmp_dom.type = LTTNG_DOMAIN_UST; | |
2167 | ||
0e115563 DG |
2168 | switch (domain->type) { |
2169 | case LTTNG_DOMAIN_LOG4J: | |
da6c3a50 | 2170 | default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME; |
0e115563 DG |
2171 | break; |
2172 | case LTTNG_DOMAIN_JUL: | |
da6c3a50 | 2173 | default_chan_name = DEFAULT_JUL_CHANNEL_NAME; |
0e115563 DG |
2174 | break; |
2175 | case LTTNG_DOMAIN_PYTHON: | |
2176 | default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
2177 | break; | |
2178 | default: | |
e98a44b0 | 2179 | /* The switch/case we are in makes this impossible */ |
0e115563 | 2180 | assert(0); |
da6c3a50 DG |
2181 | } |
2182 | ||
971da06a | 2183 | { |
8404118c | 2184 | char *filter_expression_copy = NULL; |
51755dc8 | 2185 | struct lttng_filter_bytecode *filter_copy = NULL; |
971da06a JG |
2186 | |
2187 | if (filter) { | |
51755dc8 JG |
2188 | const size_t filter_size = sizeof( |
2189 | struct lttng_filter_bytecode) | |
2190 | + filter->len; | |
2191 | ||
2192 | filter_copy = zmalloc(filter_size); | |
971da06a | 2193 | if (!filter_copy) { |
018096a4 | 2194 | ret = LTTNG_ERR_NOMEM; |
b742e3e2 | 2195 | goto error; |
971da06a | 2196 | } |
51755dc8 | 2197 | memcpy(filter_copy, filter, filter_size); |
971da06a | 2198 | |
8404118c JG |
2199 | filter_expression_copy = |
2200 | strdup(filter_expression); | |
2201 | if (!filter_expression) { | |
2202 | ret = LTTNG_ERR_NOMEM; | |
51755dc8 JG |
2203 | } |
2204 | ||
2205 | if (!filter_expression_copy || !filter_copy) { | |
2206 | free(filter_expression_copy); | |
2207 | free(filter_copy); | |
2208 | goto error; | |
8404118c | 2209 | } |
971da06a JG |
2210 | } |
2211 | ||
88f06f15 | 2212 | ret = cmd_enable_event_internal(session, &tmp_dom, |
971da06a | 2213 | (char *) default_chan_name, |
8404118c JG |
2214 | &uevent, filter_expression_copy, |
2215 | filter_copy, NULL, wpipe); | |
971da06a JG |
2216 | } |
2217 | ||
94382e15 JG |
2218 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2219 | goto already_enabled; | |
2220 | } else if (ret != LTTNG_OK) { | |
f20baf8e DG |
2221 | goto error; |
2222 | } | |
2223 | ||
2224 | /* The wild card * means that everything should be enabled. */ | |
2225 | if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) { | |
8404118c JG |
2226 | ret = event_agent_enable_all(usess, agt, event, filter, |
2227 | filter_expression); | |
f20baf8e | 2228 | } else { |
8404118c JG |
2229 | ret = event_agent_enable(usess, agt, event, filter, |
2230 | filter_expression); | |
f20baf8e | 2231 | } |
51755dc8 JG |
2232 | filter = NULL; |
2233 | filter_expression = NULL; | |
f20baf8e DG |
2234 | if (ret != LTTNG_OK) { |
2235 | goto error; | |
2236 | } | |
2237 | ||
2238 | break; | |
2239 | } | |
2f77fc4b | 2240 | default: |
f73fabfd | 2241 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2242 | goto error; |
2243 | } | |
2244 | ||
f73fabfd | 2245 | ret = LTTNG_OK; |
2f77fc4b | 2246 | |
94382e15 | 2247 | already_enabled: |
2f77fc4b | 2248 | error: |
49d21f93 MD |
2249 | free(filter_expression); |
2250 | free(filter); | |
2251 | free(exclusion); | |
cf0bcb51 | 2252 | channel_attr_destroy(attr); |
2223c96f | 2253 | rcu_read_unlock(); |
2f77fc4b DG |
2254 | return ret; |
2255 | } | |
2256 | ||
88f06f15 JG |
2257 | /* |
2258 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2259 | * We own filter, exclusion, and filter_expression. | |
2260 | */ | |
2261 | int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain, | |
2262 | char *channel_name, struct lttng_event *event, | |
2263 | char *filter_expression, | |
2264 | struct lttng_filter_bytecode *filter, | |
2265 | struct lttng_event_exclusion *exclusion, | |
2266 | int wpipe) | |
2267 | { | |
2268 | return _cmd_enable_event(session, domain, channel_name, event, | |
2269 | filter_expression, filter, exclusion, wpipe, false); | |
2270 | } | |
2271 | ||
2272 | /* | |
2273 | * Enable an event which is internal to LTTng. An internal should | |
2274 | * never be made visible to clients and are immune to checks such as | |
2275 | * reserved names. | |
2276 | */ | |
2277 | static int cmd_enable_event_internal(struct ltt_session *session, | |
2278 | struct lttng_domain *domain, | |
2279 | char *channel_name, struct lttng_event *event, | |
2280 | char *filter_expression, | |
2281 | struct lttng_filter_bytecode *filter, | |
2282 | struct lttng_event_exclusion *exclusion, | |
2283 | int wpipe) | |
2284 | { | |
2285 | return _cmd_enable_event(session, domain, channel_name, event, | |
2286 | filter_expression, filter, exclusion, wpipe, true); | |
2287 | } | |
2288 | ||
2f77fc4b DG |
2289 | /* |
2290 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2291 | */ | |
56a37563 JG |
2292 | ssize_t cmd_list_tracepoints(enum lttng_domain_type domain, |
2293 | struct lttng_event **events) | |
2f77fc4b DG |
2294 | { |
2295 | int ret; | |
2296 | ssize_t nb_events = 0; | |
2297 | ||
2298 | switch (domain) { | |
2299 | case LTTNG_DOMAIN_KERNEL: | |
2300 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2301 | if (nb_events < 0) { | |
f73fabfd | 2302 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
2f77fc4b DG |
2303 | goto error; |
2304 | } | |
2305 | break; | |
2306 | case LTTNG_DOMAIN_UST: | |
2307 | nb_events = ust_app_list_events(events); | |
2308 | if (nb_events < 0) { | |
f73fabfd | 2309 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2310 | goto error; |
2311 | } | |
2312 | break; | |
5cdb6027 | 2313 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2314 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2315 | case LTTNG_DOMAIN_PYTHON: |
f60140a1 | 2316 | nb_events = agent_list_events(events, domain); |
3c6a091f DG |
2317 | if (nb_events < 0) { |
2318 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2319 | goto error; | |
2320 | } | |
2321 | break; | |
2f77fc4b | 2322 | default: |
f73fabfd | 2323 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2324 | goto error; |
2325 | } | |
2326 | ||
2327 | return nb_events; | |
2328 | ||
2329 | error: | |
2330 | /* Return negative value to differentiate return code */ | |
2331 | return -ret; | |
2332 | } | |
2333 | ||
2334 | /* | |
2335 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
2336 | */ | |
56a37563 | 2337 | ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain, |
2f77fc4b DG |
2338 | struct lttng_event_field **fields) |
2339 | { | |
2340 | int ret; | |
2341 | ssize_t nb_fields = 0; | |
2342 | ||
2343 | switch (domain) { | |
2344 | case LTTNG_DOMAIN_UST: | |
2345 | nb_fields = ust_app_list_event_fields(fields); | |
2346 | if (nb_fields < 0) { | |
f73fabfd | 2347 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2348 | goto error; |
2349 | } | |
2350 | break; | |
2351 | case LTTNG_DOMAIN_KERNEL: | |
2352 | default: /* fall-through */ | |
f73fabfd | 2353 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2354 | goto error; |
2355 | } | |
2356 | ||
2357 | return nb_fields; | |
2358 | ||
2359 | error: | |
2360 | /* Return negative value to differentiate return code */ | |
2361 | return -ret; | |
2362 | } | |
2363 | ||
834978fd DG |
2364 | ssize_t cmd_list_syscalls(struct lttng_event **events) |
2365 | { | |
2366 | return syscall_table_list(events); | |
2367 | } | |
2368 | ||
a5dfbb9d MD |
2369 | /* |
2370 | * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread. | |
2371 | * | |
2372 | * Called with session lock held. | |
2373 | */ | |
2374 | ssize_t cmd_list_tracker_pids(struct ltt_session *session, | |
56a37563 | 2375 | enum lttng_domain_type domain, int32_t **pids) |
a5dfbb9d MD |
2376 | { |
2377 | int ret; | |
2378 | ssize_t nr_pids = 0; | |
2379 | ||
2380 | switch (domain) { | |
2381 | case LTTNG_DOMAIN_KERNEL: | |
2382 | { | |
2383 | struct ltt_kernel_session *ksess; | |
2384 | ||
2385 | ksess = session->kernel_session; | |
2386 | nr_pids = kernel_list_tracker_pids(ksess, pids); | |
2387 | if (nr_pids < 0) { | |
2388 | ret = LTTNG_ERR_KERN_LIST_FAIL; | |
2389 | goto error; | |
2390 | } | |
2391 | break; | |
2392 | } | |
2393 | case LTTNG_DOMAIN_UST: | |
2394 | { | |
2395 | struct ltt_ust_session *usess; | |
2396 | ||
2397 | usess = session->ust_session; | |
2398 | nr_pids = trace_ust_list_tracker_pids(usess, pids); | |
2399 | if (nr_pids < 0) { | |
2400 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2401 | goto error; | |
2402 | } | |
2403 | break; | |
2404 | } | |
2405 | case LTTNG_DOMAIN_LOG4J: | |
2406 | case LTTNG_DOMAIN_JUL: | |
2407 | case LTTNG_DOMAIN_PYTHON: | |
2408 | default: | |
2409 | ret = LTTNG_ERR_UND; | |
2410 | goto error; | |
2411 | } | |
2412 | ||
2413 | return nr_pids; | |
2414 | ||
2415 | error: | |
2416 | /* Return negative value to differentiate return code */ | |
2417 | return -ret; | |
2418 | } | |
2419 | ||
a1ae2ea5 JD |
2420 | static |
2421 | int domain_mkdir(const struct consumer_output *output, | |
2422 | const struct ltt_session *session, | |
2423 | uid_t uid, gid_t gid) | |
2424 | { | |
2425 | struct consumer_socket *socket; | |
2426 | struct lttng_ht_iter iter; | |
2427 | int ret; | |
2428 | char *path = NULL; | |
2429 | ||
2430 | if (!output || !output->socks) { | |
2431 | ERR("No consumer output found"); | |
2432 | ret = -1; | |
2433 | goto end; | |
2434 | } | |
2435 | ||
2436 | path = zmalloc(LTTNG_PATH_MAX * sizeof(char)); | |
2437 | if (!path) { | |
2438 | ERR("Cannot allocate mkdir path"); | |
2439 | ret = -1; | |
2440 | goto end; | |
2441 | } | |
2442 | ||
2443 | ret = snprintf(path, LTTNG_PATH_MAX, "%s%s%s", | |
2444 | session_get_base_path(session), | |
2445 | output->chunk_path, output->subdir); | |
2446 | if (ret < 0 || ret >= LTTNG_PATH_MAX) { | |
2447 | ERR("Format path"); | |
2448 | ret = -1; | |
2449 | goto end; | |
2450 | } | |
2451 | ||
2452 | DBG("Domain mkdir %s for session %" PRIu64, path, session->id); | |
2453 | rcu_read_lock(); | |
2454 | /* | |
2455 | * We have to iterate to find a socket, but we only need to send the | |
2456 | * rename command to one consumer, so we break after the first one. | |
2457 | */ | |
2458 | cds_lfht_for_each_entry(output->socks->ht, &iter.iter, socket, node.node) { | |
2459 | pthread_mutex_lock(socket->lock); | |
2460 | ret = consumer_mkdir(socket, session->id, output, path, uid, gid); | |
2461 | pthread_mutex_unlock(socket->lock); | |
2462 | if (ret) { | |
2463 | ERR("Consumer mkdir"); | |
2464 | ret = -1; | |
2465 | goto end_unlock; | |
2466 | } | |
2467 | break; | |
2468 | } | |
2469 | ||
2470 | ret = 0; | |
2471 | ||
2472 | end_unlock: | |
2473 | rcu_read_unlock(); | |
2474 | end: | |
2475 | free(path); | |
2476 | return ret; | |
2477 | } | |
2478 | ||
2479 | static | |
2480 | int session_mkdir(const struct ltt_session *session) | |
2481 | { | |
2482 | int ret; | |
2483 | struct consumer_output *output; | |
2484 | uid_t uid; | |
2485 | gid_t gid; | |
2486 | ||
2487 | /* | |
2488 | * Unsupported feature in lttng-relayd before 2.11, not an error since it | |
2489 | * is only needed for session rotation and the user will get an error | |
2490 | * on rotate. | |
2491 | */ | |
2492 | if (session->consumer->type == CONSUMER_DST_NET && | |
2493 | session->consumer->relay_major_version == 2 && | |
2494 | session->consumer->relay_minor_version < 11) { | |
2495 | ret = 0; | |
2496 | goto end; | |
2497 | } | |
2498 | ||
2499 | if (session->kernel_session) { | |
2500 | output = session->kernel_session->consumer; | |
2501 | uid = session->kernel_session->uid; | |
2502 | gid = session->kernel_session->gid; | |
2503 | ret = domain_mkdir(output, session, uid, gid); | |
2504 | if (ret) { | |
2505 | ERR("Mkdir kernel"); | |
2506 | goto end; | |
2507 | } | |
2508 | } | |
2509 | ||
2510 | if (session->ust_session) { | |
2511 | output = session->ust_session->consumer; | |
2512 | uid = session->ust_session->uid; | |
2513 | gid = session->ust_session->gid; | |
2514 | ret = domain_mkdir(output, session, uid, gid); | |
2515 | if (ret) { | |
2516 | ERR("Mkdir UST"); | |
2517 | goto end; | |
2518 | } | |
2519 | } | |
2520 | ||
2521 | ret = 0; | |
2522 | ||
2523 | end: | |
2524 | return ret; | |
2525 | } | |
2526 | ||
2f77fc4b DG |
2527 | /* |
2528 | * Command LTTNG_START_TRACE processed by the client thread. | |
a9ad0c8f MD |
2529 | * |
2530 | * Called with session mutex held. | |
2f77fc4b DG |
2531 | */ |
2532 | int cmd_start_trace(struct ltt_session *session) | |
2533 | { | |
2534 | int ret; | |
cde3e505 | 2535 | unsigned long nb_chan = 0; |
2f77fc4b DG |
2536 | struct ltt_kernel_session *ksession; |
2537 | struct ltt_ust_session *usess; | |
2f77fc4b DG |
2538 | |
2539 | assert(session); | |
2540 | ||
2541 | /* Ease our life a bit ;) */ | |
2542 | ksession = session->kernel_session; | |
2543 | usess = session->ust_session; | |
2544 | ||
8382cf6f DG |
2545 | /* Is the session already started? */ |
2546 | if (session->active) { | |
f73fabfd | 2547 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2548 | goto error; |
2549 | } | |
2550 | ||
cde3e505 DG |
2551 | /* |
2552 | * Starting a session without channel is useless since after that it's not | |
2553 | * possible to enable channel thus inform the client. | |
2554 | */ | |
2555 | if (usess && usess->domain_global.channels) { | |
2556 | nb_chan += lttng_ht_get_count(usess->domain_global.channels); | |
2557 | } | |
2558 | if (ksession) { | |
2559 | nb_chan += ksession->channel_count; | |
2560 | } | |
2561 | if (!nb_chan) { | |
2562 | ret = LTTNG_ERR_NO_CHANNEL; | |
2563 | goto error; | |
2564 | } | |
2565 | ||
5c408ad8 JD |
2566 | /* |
2567 | * Record the timestamp of the first time the session is started for | |
2568 | * an eventual session rotation call. | |
2569 | */ | |
c996624c | 2570 | if (!session->has_been_started) { |
5c408ad8 JD |
2571 | session->current_chunk_start_ts = time(NULL); |
2572 | if (session->current_chunk_start_ts == (time_t) -1) { | |
2573 | PERROR("Failed to retrieve the \"%s\" session's start time", | |
2574 | session->name); | |
2575 | ret = LTTNG_ERR_FATAL; | |
2576 | goto error; | |
2577 | } | |
c996624c JD |
2578 | if (!session->snapshot_mode && session->output_traces) { |
2579 | ret = session_mkdir(session); | |
2580 | if (ret) { | |
2581 | ERR("Failed to create the session directories"); | |
2582 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
2583 | goto error; | |
2584 | } | |
2585 | } | |
2586 | } | |
2587 | ||
2f77fc4b DG |
2588 | /* Kernel tracing */ |
2589 | if (ksession != NULL) { | |
c996624c | 2590 | DBG("Start kernel tracing session %s", session->name); |
9b6c7ec5 DG |
2591 | ret = start_kernel_session(ksession, kernel_tracer_fd); |
2592 | if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2593 | goto error; |
2594 | } | |
2f77fc4b DG |
2595 | } |
2596 | ||
2597 | /* Flag session that trace should start automatically */ | |
2598 | if (usess) { | |
14fb1ebe DG |
2599 | /* |
2600 | * Even though the start trace might fail, flag this session active so | |
2601 | * other application coming in are started by default. | |
2602 | */ | |
2603 | usess->active = 1; | |
2f77fc4b DG |
2604 | |
2605 | ret = ust_app_start_trace_all(usess); | |
2606 | if (ret < 0) { | |
f73fabfd | 2607 | ret = LTTNG_ERR_UST_START_FAIL; |
2f77fc4b DG |
2608 | goto error; |
2609 | } | |
2610 | } | |
2611 | ||
8382cf6f DG |
2612 | /* Flag this after a successful start. */ |
2613 | session->has_been_started = 1; | |
2614 | session->active = 1; | |
9b6c7ec5 | 2615 | |
5c408ad8 JD |
2616 | /* |
2617 | * Clear the flag that indicates that a rotation was done while the | |
2618 | * session was stopped. | |
2619 | */ | |
2620 | session->rotated_after_last_stop = false; | |
2621 | ||
259c2674 JD |
2622 | if (session->rotate_timer_period) { |
2623 | ret = sessiond_rotate_timer_start(session, | |
2624 | session->rotate_timer_period); | |
2625 | if (ret < 0) { | |
2626 | ERR("Failed to enable rotate timer"); | |
2627 | ret = LTTNG_ERR_UNK; | |
2628 | goto error; | |
2629 | } | |
2630 | } | |
2631 | ||
f73fabfd | 2632 | ret = LTTNG_OK; |
2f77fc4b DG |
2633 | |
2634 | error: | |
2635 | return ret; | |
2636 | } | |
2637 | ||
5c408ad8 JD |
2638 | static |
2639 | int rename_active_chunk(struct ltt_session *session) | |
2640 | { | |
2641 | int ret; | |
2642 | ||
ad9f5c17 | 2643 | session->current_archive_id++; |
5c408ad8 JD |
2644 | |
2645 | /* | |
2646 | * The currently active tracing path is now the folder we | |
2647 | * want to rename. | |
2648 | */ | |
2649 | ret = lttng_strncpy(session->rotation_chunk.current_rotate_path, | |
2650 | session->rotation_chunk.active_tracing_path, | |
2651 | sizeof(session->rotation_chunk.current_rotate_path)); | |
2652 | if (ret) { | |
2653 | ERR("Failed to copy active tracing path"); | |
2654 | goto end; | |
2655 | } | |
2656 | ||
2657 | ret = rename_complete_chunk(session, time(NULL)); | |
2658 | if (ret < 0) { | |
2659 | ERR("Failed to rename current rotate path"); | |
2660 | goto end; | |
2661 | } | |
2662 | ||
2663 | /* | |
2664 | * We just renamed, the folder, we didn't do an actual rotation, so | |
2665 | * the active tracing path is now the renamed folder and we have to | |
2666 | * restore the rotate count. | |
2667 | */ | |
2668 | ret = lttng_strncpy(session->rotation_chunk.active_tracing_path, | |
2669 | session->rotation_chunk.current_rotate_path, | |
2670 | sizeof(session->rotation_chunk.active_tracing_path)); | |
2671 | if (ret) { | |
2672 | ERR("Failed to rename active session chunk tracing path"); | |
2673 | goto end; | |
2674 | } | |
2675 | end: | |
ad9f5c17 | 2676 | session->current_archive_id--; |
5c408ad8 JD |
2677 | return ret; |
2678 | } | |
2679 | ||
2f77fc4b DG |
2680 | /* |
2681 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2682 | */ | |
2683 | int cmd_stop_trace(struct ltt_session *session) | |
2684 | { | |
2685 | int ret; | |
2686 | struct ltt_kernel_channel *kchan; | |
2687 | struct ltt_kernel_session *ksession; | |
2688 | struct ltt_ust_session *usess; | |
5c408ad8 | 2689 | bool error_occured = false; |
2f77fc4b DG |
2690 | |
2691 | assert(session); | |
2692 | ||
5c408ad8 | 2693 | DBG("Begin stop session %s (id %" PRIu64 ")", session->name, session->id); |
2f77fc4b DG |
2694 | /* Short cut */ |
2695 | ksession = session->kernel_session; | |
2696 | usess = session->ust_session; | |
2697 | ||
8382cf6f DG |
2698 | /* Session is not active. Skip everythong and inform the client. */ |
2699 | if (!session->active) { | |
f73fabfd | 2700 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
2f77fc4b DG |
2701 | goto error; |
2702 | } | |
2703 | ||
d88744a4 JD |
2704 | if (session->rotate_relay_pending_timer_enabled) { |
2705 | sessiond_timer_rotate_pending_stop(session); | |
2706 | } | |
2707 | ||
259c2674 JD |
2708 | if (session->rotate_timer_enabled) { |
2709 | sessiond_rotate_timer_stop(session); | |
2710 | } | |
2711 | ||
ad9f5c17 | 2712 | if (session->current_archive_id > 0 && !session->rotate_pending) { |
5c408ad8 JD |
2713 | ret = rename_active_chunk(session); |
2714 | if (ret) { | |
2715 | /* | |
2716 | * This error should not prevent the user from stopping | |
2717 | * the session. However, it will be reported at the end. | |
2718 | */ | |
2719 | error_occured = true; | |
2720 | } | |
2721 | } | |
2722 | ||
2f77fc4b | 2723 | /* Kernel tracer */ |
14fb1ebe | 2724 | if (ksession && ksession->active) { |
2f77fc4b DG |
2725 | DBG("Stop kernel tracing"); |
2726 | ||
566d8970 MD |
2727 | ret = kernel_stop_session(ksession); |
2728 | if (ret < 0) { | |
2729 | ret = LTTNG_ERR_KERN_STOP_FAIL; | |
2730 | goto error; | |
2731 | } | |
2732 | ||
2733 | kernel_wait_quiescent(kernel_tracer_fd); | |
2734 | ||
2735 | /* Flush metadata after stopping (if exists) */ | |
2f77fc4b DG |
2736 | if (ksession->metadata_stream_fd >= 0) { |
2737 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2738 | if (ret < 0) { | |
2739 | ERR("Kernel metadata flush failed"); | |
2740 | } | |
2741 | } | |
2742 | ||
566d8970 | 2743 | /* Flush all buffers after stopping */ |
2f77fc4b DG |
2744 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2745 | ret = kernel_flush_buffer(kchan); | |
2746 | if (ret < 0) { | |
2747 | ERR("Kernel flush buffer error"); | |
2748 | } | |
2749 | } | |
2750 | ||
14fb1ebe | 2751 | ksession->active = 0; |
5c408ad8 JD |
2752 | DBG("Kernel session stopped %s (id %" PRIu64 ")", session->name, |
2753 | session->id); | |
2f77fc4b DG |
2754 | } |
2755 | ||
14fb1ebe DG |
2756 | if (usess && usess->active) { |
2757 | /* | |
2758 | * Even though the stop trace might fail, flag this session inactive so | |
2759 | * other application coming in are not started by default. | |
2760 | */ | |
2761 | usess->active = 0; | |
2f77fc4b DG |
2762 | |
2763 | ret = ust_app_stop_trace_all(usess); | |
2764 | if (ret < 0) { | |
f73fabfd | 2765 | ret = LTTNG_ERR_UST_STOP_FAIL; |
2f77fc4b DG |
2766 | goto error; |
2767 | } | |
2768 | } | |
2769 | ||
8382cf6f DG |
2770 | /* Flag inactive after a successful stop. */ |
2771 | session->active = 0; | |
5c408ad8 | 2772 | ret = !error_occured ? LTTNG_OK : LTTNG_ERR_UNK; |
2f77fc4b DG |
2773 | |
2774 | error: | |
2775 | return ret; | |
2776 | } | |
2777 | ||
2778 | /* | |
2779 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
2780 | */ | |
bda32d56 JG |
2781 | int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri, |
2782 | struct lttng_uri *uris) | |
2f77fc4b DG |
2783 | { |
2784 | int ret, i; | |
2785 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2786 | struct ltt_ust_session *usess = session->ust_session; | |
2f77fc4b DG |
2787 | |
2788 | assert(session); | |
2789 | assert(uris); | |
2790 | assert(nb_uri > 0); | |
2791 | ||
8382cf6f DG |
2792 | /* Can't set consumer URI if the session is active. */ |
2793 | if (session->active) { | |
f73fabfd | 2794 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2795 | goto error; |
2796 | } | |
2797 | ||
bda32d56 | 2798 | /* Set the "global" consumer URIs */ |
2f77fc4b | 2799 | for (i = 0; i < nb_uri; i++) { |
bda32d56 JG |
2800 | ret = add_uri_to_consumer(session->consumer, |
2801 | &uris[i], 0, session->name); | |
a74934ba | 2802 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2803 | goto error; |
2804 | } | |
2f77fc4b DG |
2805 | } |
2806 | ||
bda32d56 JG |
2807 | /* Set UST session URIs */ |
2808 | if (session->ust_session) { | |
2809 | for (i = 0; i < nb_uri; i++) { | |
2810 | ret = add_uri_to_consumer( | |
2811 | session->ust_session->consumer, | |
2812 | &uris[i], LTTNG_DOMAIN_UST, | |
2813 | session->name); | |
2814 | if (ret != LTTNG_OK) { | |
2815 | goto error; | |
2816 | } | |
2817 | } | |
2818 | } | |
2819 | ||
2820 | /* Set kernel session URIs */ | |
2821 | if (session->kernel_session) { | |
2822 | for (i = 0; i < nb_uri; i++) { | |
2823 | ret = add_uri_to_consumer( | |
2824 | session->kernel_session->consumer, | |
2825 | &uris[i], LTTNG_DOMAIN_KERNEL, | |
2826 | session->name); | |
2827 | if (ret != LTTNG_OK) { | |
2828 | goto error; | |
2829 | } | |
2830 | } | |
2831 | } | |
2832 | ||
7ab70fe0 DG |
2833 | /* |
2834 | * Make sure to set the session in output mode after we set URI since a | |
2835 | * session can be created without URL (thus flagged in no output mode). | |
2836 | */ | |
2837 | session->output_traces = 1; | |
2838 | if (ksess) { | |
2839 | ksess->output_traces = 1; | |
bda32d56 JG |
2840 | } |
2841 | ||
2842 | if (usess) { | |
7ab70fe0 DG |
2843 | usess->output_traces = 1; |
2844 | } | |
2845 | ||
2f77fc4b | 2846 | /* All good! */ |
f73fabfd | 2847 | ret = LTTNG_OK; |
2f77fc4b DG |
2848 | |
2849 | error: | |
2850 | return ret; | |
2851 | } | |
2852 | ||
2853 | /* | |
2854 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2855 | */ | |
2856 | int cmd_create_session_uri(char *name, struct lttng_uri *uris, | |
ecc48a90 | 2857 | size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer) |
2f77fc4b DG |
2858 | { |
2859 | int ret; | |
2f77fc4b DG |
2860 | struct ltt_session *session; |
2861 | ||
2862 | assert(name); | |
2bba9e53 | 2863 | assert(creds); |
785d2d0d | 2864 | |
2f77fc4b DG |
2865 | /* |
2866 | * Verify if the session already exist | |
2867 | * | |
2868 | * XXX: There is no need for the session lock list here since the caller | |
2869 | * (process_client_msg) is holding it. We might want to change that so a | |
2870 | * single command does not lock the entire session list. | |
2871 | */ | |
2872 | session = session_find_by_name(name); | |
2873 | if (session != NULL) { | |
f73fabfd | 2874 | ret = LTTNG_ERR_EXIST_SESS; |
2f77fc4b DG |
2875 | goto find_error; |
2876 | } | |
2877 | ||
2878 | /* Create tracing session in the registry */ | |
dec56f6c | 2879 | ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds), |
2f77fc4b | 2880 | LTTNG_SOCK_GET_GID_CRED(creds)); |
f73fabfd | 2881 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2882 | goto session_error; |
2883 | } | |
2884 | ||
2885 | /* | |
2886 | * Get the newly created session pointer back | |
2887 | * | |
2888 | * XXX: There is no need for the session lock list here since the caller | |
2889 | * (process_client_msg) is holding it. We might want to change that so a | |
2890 | * single command does not lock the entire session list. | |
2891 | */ | |
2892 | session = session_find_by_name(name); | |
2893 | assert(session); | |
2894 | ||
ecc48a90 | 2895 | session->live_timer = live_timer; |
2f77fc4b DG |
2896 | /* Create default consumer output for the session not yet created. */ |
2897 | session->consumer = consumer_create_output(CONSUMER_DST_LOCAL); | |
2898 | if (session->consumer == NULL) { | |
f73fabfd | 2899 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2900 | goto consumer_error; |
2901 | } | |
2902 | ||
2bba9e53 | 2903 | if (uris) { |
bda32d56 | 2904 | ret = cmd_set_consumer_uri(session, nb_uri, uris); |
2bba9e53 DG |
2905 | if (ret != LTTNG_OK) { |
2906 | goto consumer_error; | |
2907 | } | |
2908 | session->output_traces = 1; | |
2909 | } else { | |
2910 | session->output_traces = 0; | |
2911 | DBG2("Session %s created with no output", session->name); | |
2f77fc4b DG |
2912 | } |
2913 | ||
2914 | session->consumer->enabled = 1; | |
2915 | ||
f73fabfd | 2916 | return LTTNG_OK; |
2f77fc4b DG |
2917 | |
2918 | consumer_error: | |
2919 | session_destroy(session); | |
2920 | session_error: | |
2921 | find_error: | |
2922 | return ret; | |
2923 | } | |
2924 | ||
27babd3a DG |
2925 | /* |
2926 | * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread. | |
2927 | */ | |
2928 | int cmd_create_session_snapshot(char *name, struct lttng_uri *uris, | |
2929 | size_t nb_uri, lttng_sock_cred *creds) | |
2930 | { | |
2931 | int ret; | |
2932 | struct ltt_session *session; | |
2933 | struct snapshot_output *new_output = NULL; | |
2934 | ||
2935 | assert(name); | |
2936 | assert(creds); | |
2937 | ||
2938 | /* | |
2939 | * Create session in no output mode with URIs set to NULL. The uris we've | |
2940 | * received are for a default snapshot output if one. | |
2941 | */ | |
ae58b817 | 2942 | ret = cmd_create_session_uri(name, NULL, 0, creds, 0); |
27babd3a DG |
2943 | if (ret != LTTNG_OK) { |
2944 | goto error; | |
2945 | } | |
2946 | ||
2947 | /* Get the newly created session pointer back. This should NEVER fail. */ | |
2948 | session = session_find_by_name(name); | |
2949 | assert(session); | |
2950 | ||
2951 | /* Flag session for snapshot mode. */ | |
2952 | session->snapshot_mode = 1; | |
2953 | ||
2954 | /* Skip snapshot output creation if no URI is given. */ | |
2955 | if (nb_uri == 0) { | |
2956 | goto end; | |
2957 | } | |
2958 | ||
2959 | new_output = snapshot_output_alloc(); | |
2960 | if (!new_output) { | |
2961 | ret = LTTNG_ERR_NOMEM; | |
2962 | goto error_snapshot_alloc; | |
2963 | } | |
2964 | ||
2965 | ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL, | |
2966 | uris, nb_uri, session->consumer, new_output, &session->snapshot); | |
2967 | if (ret < 0) { | |
2968 | if (ret == -ENOMEM) { | |
2969 | ret = LTTNG_ERR_NOMEM; | |
2970 | } else { | |
2971 | ret = LTTNG_ERR_INVALID; | |
2972 | } | |
2973 | goto error_snapshot; | |
2974 | } | |
2975 | ||
2976 | rcu_read_lock(); | |
2977 | snapshot_add_output(&session->snapshot, new_output); | |
2978 | rcu_read_unlock(); | |
2979 | ||
2980 | end: | |
2981 | return LTTNG_OK; | |
2982 | ||
2983 | error_snapshot: | |
2984 | snapshot_output_destroy(new_output); | |
2985 | error_snapshot_alloc: | |
2986 | session_destroy(session); | |
2987 | error: | |
2988 | return ret; | |
2989 | } | |
2990 | ||
2f77fc4b DG |
2991 | /* |
2992 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
a9ad0c8f MD |
2993 | * |
2994 | * Called with session lock held. | |
2f77fc4b | 2995 | */ |
90936dcf JD |
2996 | int cmd_destroy_session(struct ltt_session *session, int wpipe, |
2997 | struct notification_thread_handle *notification_thread_handle) | |
2f77fc4b DG |
2998 | { |
2999 | int ret; | |
3000 | struct ltt_ust_session *usess; | |
3001 | struct ltt_kernel_session *ksess; | |
3002 | ||
3003 | /* Safety net */ | |
3004 | assert(session); | |
3005 | ||
3006 | usess = session->ust_session; | |
3007 | ksess = session->kernel_session; | |
3008 | ||
5c408ad8 JD |
3009 | DBG("Begin destroy session %s (id %" PRIu64 ")", session->name, session->id); |
3010 | ||
d88744a4 JD |
3011 | if (session->rotate_relay_pending_timer_enabled) { |
3012 | sessiond_timer_rotate_pending_stop(session); | |
3013 | } | |
3014 | ||
259c2674 JD |
3015 | if (session->rotate_timer_enabled) { |
3016 | sessiond_rotate_timer_stop(session); | |
3017 | } | |
3018 | ||
90936dcf JD |
3019 | if (session->rotate_size) { |
3020 | unsubscribe_session_consumed_size_rotation(session, notification_thread_handle); | |
3021 | session->rotate_size = 0; | |
3022 | } | |
3023 | ||
5c408ad8 JD |
3024 | /* |
3025 | * The rename of the current chunk is performed at stop, but if we rotated | |
3026 | * the session after the previous stop command, we need to rename the | |
3027 | * new (and empty) chunk that was started in between. | |
3028 | */ | |
3029 | if (session->rotated_after_last_stop) { | |
3030 | rename_active_chunk(session); | |
3031 | } | |
3032 | ||
2f77fc4b DG |
3033 | /* Clean kernel session teardown */ |
3034 | kernel_destroy_session(ksess); | |
3035 | ||
3036 | /* UST session teardown */ | |
3037 | if (usess) { | |
3038 | /* Close any relayd session */ | |
3039 | consumer_output_send_destroy_relayd(usess->consumer); | |
3040 | ||
3041 | /* Destroy every UST application related to this session. */ | |
3042 | ret = ust_app_destroy_trace_all(usess); | |
3043 | if (ret) { | |
3044 | ERR("Error in ust_app_destroy_trace_all"); | |
3045 | } | |
3046 | ||
3047 | /* Clean up the rest. */ | |
3048 | trace_ust_destroy_session(usess); | |
3049 | } | |
3050 | ||
3051 | /* | |
3052 | * Must notify the kernel thread here to update it's poll set in order to | |
3053 | * remove the channel(s)' fd just destroyed. | |
3054 | */ | |
3055 | ret = notify_thread_pipe(wpipe); | |
3056 | if (ret < 0) { | |
3057 | PERROR("write kernel poll pipe"); | |
3058 | } | |
3059 | ||
a503e1ef JG |
3060 | if (session->shm_path[0]) { |
3061 | /* | |
3062 | * When a session is created with an explicit shm_path, | |
3063 | * the consumer daemon will create its shared memory files | |
3064 | * at that location and will *not* unlink them. This is normal | |
3065 | * as the intention of that feature is to make it possible | |
3066 | * to retrieve the content of those files should a crash occur. | |
3067 | * | |
3068 | * To ensure the content of those files can be used, the | |
3069 | * sessiond daemon will replicate the content of the metadata | |
3070 | * cache in a metadata file. | |
3071 | * | |
3072 | * On clean-up, it is expected that the consumer daemon will | |
3073 | * unlink the shared memory files and that the session daemon | |
3074 | * will unlink the metadata file. Then, the session's directory | |
3075 | * in the shm path can be removed. | |
3076 | * | |
3077 | * Unfortunately, a flaw in the design of the sessiond's and | |
3078 | * consumerd's tear down of channels makes it impossible to | |
3079 | * determine when the sessiond _and_ the consumerd have both | |
3080 | * destroyed their representation of a channel. For one, the | |
3081 | * unlinking, close, and rmdir happen in deferred 'call_rcu' | |
3082 | * callbacks in both daemons. | |
3083 | * | |
3084 | * However, it is also impossible for the sessiond to know when | |
3085 | * the consumer daemon is done destroying its channel(s) since | |
3086 | * it occurs as a reaction to the closing of the channel's file | |
3087 | * descriptor. There is no resulting communication initiated | |
3088 | * from the consumerd to the sessiond to confirm that the | |
3089 | * operation is completed (and was successful). | |
3090 | * | |
3091 | * Until this is all fixed, the session daemon checks for the | |
3092 | * removal of the session's shm path which makes it possible | |
3093 | * to safely advertise a session as having been destroyed. | |
3094 | * | |
3095 | * Prior to this fix, it was not possible to reliably save | |
3096 | * a session making use of the --shm-path option, destroy it, | |
3097 | * and load it again. This is because the creation of the | |
3098 | * session would fail upon seeing the session's shm path | |
3099 | * already in existence. | |
3100 | * | |
3101 | * Note that none of the error paths in the check for the | |
3102 | * directory's existence return an error. This is normal | |
3103 | * as there isn't much that can be done. The session will | |
3104 | * be destroyed properly, except that we can't offer the | |
3105 | * guarantee that the same session can be re-created. | |
3106 | */ | |
3107 | current_completion_handler = &destroy_completion_handler.handler; | |
3108 | ret = lttng_strncpy(destroy_completion_handler.shm_path, | |
3109 | session->shm_path, | |
3110 | sizeof(destroy_completion_handler.shm_path)); | |
3111 | assert(!ret); | |
3112 | } | |
2f77fc4b DG |
3113 | ret = session_destroy(session); |
3114 | ||
3115 | return ret; | |
3116 | } | |
3117 | ||
2f77fc4b DG |
3118 | /* |
3119 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
3120 | */ | |
56a37563 JG |
3121 | int cmd_register_consumer(struct ltt_session *session, |
3122 | enum lttng_domain_type domain, const char *sock_path, | |
3123 | struct consumer_data *cdata) | |
2f77fc4b DG |
3124 | { |
3125 | int ret, sock; | |
dd81b457 | 3126 | struct consumer_socket *socket = NULL; |
2f77fc4b DG |
3127 | |
3128 | assert(session); | |
3129 | assert(cdata); | |
3130 | assert(sock_path); | |
3131 | ||
3132 | switch (domain) { | |
3133 | case LTTNG_DOMAIN_KERNEL: | |
3134 | { | |
3135 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3136 | ||
3137 | assert(ksess); | |
3138 | ||
3139 | /* Can't register a consumer if there is already one */ | |
3140 | if (ksess->consumer_fds_sent != 0) { | |
f73fabfd | 3141 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
3142 | goto error; |
3143 | } | |
3144 | ||
3145 | sock = lttcomm_connect_unix_sock(sock_path); | |
3146 | if (sock < 0) { | |
f73fabfd | 3147 | ret = LTTNG_ERR_CONNECT_FAIL; |
2f77fc4b DG |
3148 | goto error; |
3149 | } | |
4ce514c4 | 3150 | cdata->cmd_sock = sock; |
2f77fc4b | 3151 | |
4ce514c4 | 3152 | socket = consumer_allocate_socket(&cdata->cmd_sock); |
2f77fc4b | 3153 | if (socket == NULL) { |
f66c074c DG |
3154 | ret = close(sock); |
3155 | if (ret < 0) { | |
3156 | PERROR("close register consumer"); | |
3157 | } | |
4ce514c4 | 3158 | cdata->cmd_sock = -1; |
f73fabfd | 3159 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
3160 | goto error; |
3161 | } | |
3162 | ||
3163 | socket->lock = zmalloc(sizeof(pthread_mutex_t)); | |
3164 | if (socket->lock == NULL) { | |
3165 | PERROR("zmalloc pthread mutex"); | |
f73fabfd | 3166 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
3167 | goto error; |
3168 | } | |
3169 | pthread_mutex_init(socket->lock, NULL); | |
3170 | socket->registered = 1; | |
3171 | ||
3172 | rcu_read_lock(); | |
3173 | consumer_add_socket(socket, ksess->consumer); | |
3174 | rcu_read_unlock(); | |
3175 | ||
3176 | pthread_mutex_lock(&cdata->pid_mutex); | |
3177 | cdata->pid = -1; | |
3178 | pthread_mutex_unlock(&cdata->pid_mutex); | |
3179 | ||
3180 | break; | |
3181 | } | |
3182 | default: | |
3183 | /* TODO: Userspace tracing */ | |
f73fabfd | 3184 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3185 | goto error; |
3186 | } | |
3187 | ||
dd81b457 | 3188 | return LTTNG_OK; |
2f77fc4b DG |
3189 | |
3190 | error: | |
dd81b457 DG |
3191 | if (socket) { |
3192 | consumer_destroy_socket(socket); | |
3193 | } | |
2f77fc4b DG |
3194 | return ret; |
3195 | } | |
3196 | ||
3197 | /* | |
3198 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
3199 | */ | |
3200 | ssize_t cmd_list_domains(struct ltt_session *session, | |
3201 | struct lttng_domain **domains) | |
3202 | { | |
3203 | int ret, index = 0; | |
3204 | ssize_t nb_dom = 0; | |
fefd409b DG |
3205 | struct agent *agt; |
3206 | struct lttng_ht_iter iter; | |
2f77fc4b DG |
3207 | |
3208 | if (session->kernel_session != NULL) { | |
3209 | DBG3("Listing domains found kernel domain"); | |
3210 | nb_dom++; | |
3211 | } | |
3212 | ||
3213 | if (session->ust_session != NULL) { | |
3214 | DBG3("Listing domains found UST global domain"); | |
3215 | nb_dom++; | |
3c6a091f | 3216 | |
e0a74f01 | 3217 | rcu_read_lock(); |
fefd409b DG |
3218 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
3219 | agt, node.node) { | |
3220 | if (agt->being_used) { | |
3221 | nb_dom++; | |
3222 | } | |
3c6a091f | 3223 | } |
e0a74f01 | 3224 | rcu_read_unlock(); |
2f77fc4b DG |
3225 | } |
3226 | ||
fa64dfb4 JG |
3227 | if (!nb_dom) { |
3228 | goto end; | |
3229 | } | |
3230 | ||
2f77fc4b DG |
3231 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
3232 | if (*domains == NULL) { | |
f73fabfd | 3233 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
3234 | goto error; |
3235 | } | |
3236 | ||
3237 | if (session->kernel_session != NULL) { | |
3238 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
b5edb9e8 PP |
3239 | |
3240 | /* Kernel session buffer type is always GLOBAL */ | |
3241 | (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL; | |
3242 | ||
2f77fc4b DG |
3243 | index++; |
3244 | } | |
3245 | ||
3246 | if (session->ust_session != NULL) { | |
3247 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
88c5f0d8 | 3248 | (*domains)[index].buf_type = session->ust_session->buffer_type; |
2f77fc4b | 3249 | index++; |
3c6a091f | 3250 | |
e0a74f01 | 3251 | rcu_read_lock(); |
fefd409b DG |
3252 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
3253 | agt, node.node) { | |
3254 | if (agt->being_used) { | |
3255 | (*domains)[index].type = agt->domain; | |
3256 | (*domains)[index].buf_type = session->ust_session->buffer_type; | |
3257 | index++; | |
3258 | } | |
3c6a091f | 3259 | } |
e0a74f01 | 3260 | rcu_read_unlock(); |
2f77fc4b | 3261 | } |
fa64dfb4 | 3262 | end: |
2f77fc4b DG |
3263 | return nb_dom; |
3264 | ||
3265 | error: | |
f73fabfd DG |
3266 | /* Return negative value to differentiate return code */ |
3267 | return -ret; | |
2f77fc4b DG |
3268 | } |
3269 | ||
3270 | ||
3271 | /* | |
3272 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
3273 | */ | |
56a37563 JG |
3274 | ssize_t cmd_list_channels(enum lttng_domain_type domain, |
3275 | struct ltt_session *session, struct lttng_channel **channels) | |
2f77fc4b | 3276 | { |
53e367f9 | 3277 | ssize_t nb_chan = 0, payload_size = 0, ret; |
2f77fc4b DG |
3278 | |
3279 | switch (domain) { | |
3280 | case LTTNG_DOMAIN_KERNEL: | |
3281 | if (session->kernel_session != NULL) { | |
3282 | nb_chan = session->kernel_session->channel_count; | |
3283 | } | |
3284 | DBG3("Number of kernel channels %zd", nb_chan); | |
c7d620a2 | 3285 | if (nb_chan <= 0) { |
53e367f9 JG |
3286 | ret = -LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
3287 | goto end; | |
c7d620a2 | 3288 | } |
2f77fc4b DG |
3289 | break; |
3290 | case LTTNG_DOMAIN_UST: | |
3291 | if (session->ust_session != NULL) { | |
7ffc31a2 | 3292 | rcu_read_lock(); |
2f77fc4b | 3293 | nb_chan = lttng_ht_get_count( |
7ffc31a2 JG |
3294 | session->ust_session->domain_global.channels); |
3295 | rcu_read_unlock(); | |
2f77fc4b DG |
3296 | } |
3297 | DBG3("Number of UST global channels %zd", nb_chan); | |
ade7ce52 | 3298 | if (nb_chan < 0) { |
53e367f9 JG |
3299 | ret = -LTTNG_ERR_UST_CHAN_NOT_FOUND; |
3300 | goto end; | |
c7d620a2 | 3301 | } |
2f77fc4b DG |
3302 | break; |
3303 | default: | |
53e367f9 JG |
3304 | ret = -LTTNG_ERR_UND; |
3305 | goto end; | |
2f77fc4b DG |
3306 | } |
3307 | ||
3308 | if (nb_chan > 0) { | |
53e367f9 | 3309 | const size_t channel_size = sizeof(struct lttng_channel) + |
cf0bcb51 JG |
3310 | sizeof(struct lttng_channel_extended); |
3311 | struct lttng_channel_extended *channel_exts; | |
53e367f9 JG |
3312 | |
3313 | payload_size = nb_chan * channel_size; | |
3314 | *channels = zmalloc(payload_size); | |
2f77fc4b | 3315 | if (*channels == NULL) { |
53e367f9 JG |
3316 | ret = -LTTNG_ERR_FATAL; |
3317 | goto end; | |
2f77fc4b DG |
3318 | } |
3319 | ||
53e367f9 JG |
3320 | channel_exts = ((void *) *channels) + |
3321 | (nb_chan * sizeof(struct lttng_channel)); | |
d449df4a MD |
3322 | ret = list_lttng_channels(domain, session, *channels, channel_exts); |
3323 | if (ret != LTTNG_OK) { | |
3324 | free(*channels); | |
3325 | *channels = NULL; | |
3326 | goto end; | |
3327 | } | |
53e367f9 JG |
3328 | } else { |
3329 | *channels = NULL; | |
2f77fc4b DG |
3330 | } |
3331 | ||
53e367f9 JG |
3332 | ret = payload_size; |
3333 | end: | |
3334 | return ret; | |
2f77fc4b DG |
3335 | } |
3336 | ||
3337 | /* | |
3338 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3339 | */ | |
56a37563 JG |
3340 | ssize_t cmd_list_events(enum lttng_domain_type domain, |
3341 | struct ltt_session *session, char *channel_name, | |
b4e3ceb9 | 3342 | struct lttng_event **events, size_t *total_size) |
2f77fc4b DG |
3343 | { |
3344 | int ret = 0; | |
3345 | ssize_t nb_event = 0; | |
3346 | ||
3347 | switch (domain) { | |
3348 | case LTTNG_DOMAIN_KERNEL: | |
3349 | if (session->kernel_session != NULL) { | |
3350 | nb_event = list_lttng_kernel_events(channel_name, | |
b4e3ceb9 PP |
3351 | session->kernel_session, events, |
3352 | total_size); | |
2f77fc4b DG |
3353 | } |
3354 | break; | |
3355 | case LTTNG_DOMAIN_UST: | |
3356 | { | |
3357 | if (session->ust_session != NULL) { | |
3358 | nb_event = list_lttng_ust_global_events(channel_name, | |
b4e3ceb9 PP |
3359 | &session->ust_session->domain_global, events, |
3360 | total_size); | |
2f77fc4b DG |
3361 | } |
3362 | break; | |
3363 | } | |
5cdb6027 | 3364 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 3365 | case LTTNG_DOMAIN_JUL: |
0e115563 | 3366 | case LTTNG_DOMAIN_PYTHON: |
3c6a091f | 3367 | if (session->ust_session) { |
fefd409b DG |
3368 | struct lttng_ht_iter iter; |
3369 | struct agent *agt; | |
3370 | ||
b11feea5 | 3371 | rcu_read_lock(); |
fefd409b DG |
3372 | cds_lfht_for_each_entry(session->ust_session->agents->ht, |
3373 | &iter.iter, agt, node.node) { | |
1dfd9906 JG |
3374 | if (agt->domain == domain) { |
3375 | nb_event = list_lttng_agent_events( | |
b4e3ceb9 PP |
3376 | agt, events, |
3377 | total_size); | |
1dfd9906 JG |
3378 | break; |
3379 | } | |
fefd409b | 3380 | } |
b11feea5 | 3381 | rcu_read_unlock(); |
3c6a091f DG |
3382 | } |
3383 | break; | |
2f77fc4b | 3384 | default: |
f73fabfd | 3385 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3386 | goto error; |
3387 | } | |
3388 | ||
f73fabfd | 3389 | return nb_event; |
2f77fc4b DG |
3390 | |
3391 | error: | |
f73fabfd DG |
3392 | /* Return negative value to differentiate return code */ |
3393 | return -ret; | |
2f77fc4b DG |
3394 | } |
3395 | ||
3396 | /* | |
3397 | * Using the session list, filled a lttng_session array to send back to the | |
3398 | * client for session listing. | |
3399 | * | |
3400 | * The session list lock MUST be acquired before calling this function. Use | |
3401 | * session_lock_list() and session_unlock_list(). | |
3402 | */ | |
3403 | void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid, | |
3404 | gid_t gid) | |
3405 | { | |
3406 | int ret; | |
3407 | unsigned int i = 0; | |
3408 | struct ltt_session *session; | |
3409 | struct ltt_session_list *list = session_get_list(); | |
3410 | ||
3411 | DBG("Getting all available session for UID %d GID %d", | |
3412 | uid, gid); | |
3413 | /* | |
3414 | * Iterate over session list and append data after the control struct in | |
3415 | * the buffer. | |
3416 | */ | |
3417 | cds_list_for_each_entry(session, &list->head, list) { | |
3418 | /* | |
3419 | * Only list the sessions the user can control. | |
3420 | */ | |
3421 | if (!session_access_ok(session, uid, gid)) { | |
3422 | continue; | |
3423 | } | |
3424 | ||
3425 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3426 | struct ltt_ust_session *usess = session->ust_session; | |
3427 | ||
3428 | if (session->consumer->type == CONSUMER_DST_NET || | |
3429 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
3430 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
3431 | ret = build_network_session_path(sessions[i].path, | |
dec56f6c | 3432 | sizeof(sessions[i].path), session); |
2f77fc4b | 3433 | } else { |
dec56f6c | 3434 | ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s", |
366a9222 | 3435 | session->consumer->dst.session_root_path); |
2f77fc4b DG |
3436 | } |
3437 | if (ret < 0) { | |
3438 | PERROR("snprintf session path"); | |
3439 | continue; | |
3440 | } | |
3441 | ||
3442 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
3443 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
8382cf6f | 3444 | sessions[i].enabled = session->active; |
2cbf8fed | 3445 | sessions[i].snapshot_mode = session->snapshot_mode; |
8960e9cd | 3446 | sessions[i].live_timer_interval = session->live_timer; |
2f77fc4b DG |
3447 | i++; |
3448 | } | |
3449 | } | |
3450 | ||
806e2684 | 3451 | /* |
6d805429 | 3452 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
d3f14b8a | 3453 | * ready for trace analysis (or any kind of reader) or else 1 for pending data. |
806e2684 | 3454 | */ |
6d805429 | 3455 | int cmd_data_pending(struct ltt_session *session) |
806e2684 DG |
3456 | { |
3457 | int ret; | |
3458 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3459 | struct ltt_ust_session *usess = session->ust_session; | |
3460 | ||
3461 | assert(session); | |
3462 | ||
5c408ad8 JD |
3463 | DBG("Data pending for session %s", session->name); |
3464 | ||
806e2684 | 3465 | /* Session MUST be stopped to ask for data availability. */ |
8382cf6f | 3466 | if (session->active) { |
806e2684 DG |
3467 | ret = LTTNG_ERR_SESSION_STARTED; |
3468 | goto error; | |
3a89d11a DG |
3469 | } else { |
3470 | /* | |
3471 | * If stopped, just make sure we've started before else the above call | |
3472 | * will always send that there is data pending. | |
3473 | * | |
3474 | * The consumer assumes that when the data pending command is received, | |
3475 | * the trace has been started before or else no output data is written | |
3476 | * by the streams which is a condition for data pending. So, this is | |
3477 | * *VERY* important that we don't ask the consumer before a start | |
3478 | * trace. | |
3479 | */ | |
8382cf6f | 3480 | if (!session->has_been_started) { |
3a89d11a DG |
3481 | ret = 0; |
3482 | goto error; | |
3483 | } | |
806e2684 DG |
3484 | } |
3485 | ||
5c408ad8 JD |
3486 | /* |
3487 | * A rotation is still pending, we have to wait. | |
3488 | */ | |
3489 | if (session->rotate_pending) { | |
3490 | DBG("Rotate still pending for session %s", session->name); | |
3491 | ret = 1; | |
3492 | goto error; | |
3493 | } | |
3494 | ||
806e2684 | 3495 | if (ksess && ksess->consumer) { |
6d805429 DG |
3496 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
3497 | if (ret == 1) { | |
806e2684 DG |
3498 | /* Data is still being extracted for the kernel. */ |
3499 | goto error; | |
3500 | } | |
3501 | } | |
3502 | ||
3503 | if (usess && usess->consumer) { | |
6d805429 DG |
3504 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
3505 | if (ret == 1) { | |
806e2684 DG |
3506 | /* Data is still being extracted for the kernel. */ |
3507 | goto error; | |
3508 | } | |
3509 | } | |
3510 | ||
3511 | /* Data is ready to be read by a viewer */ | |
6d805429 | 3512 | ret = 0; |
806e2684 DG |
3513 | |
3514 | error: | |
3515 | return ret; | |
3516 | } | |
3517 | ||
6dc3064a DG |
3518 | /* |
3519 | * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library. | |
3520 | * | |
3521 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3522 | */ | |
3523 | int cmd_snapshot_add_output(struct ltt_session *session, | |
3524 | struct lttng_snapshot_output *output, uint32_t *id) | |
3525 | { | |
3526 | int ret; | |
3527 | struct snapshot_output *new_output; | |
3528 | ||
3529 | assert(session); | |
3530 | assert(output); | |
3531 | ||
3532 | DBG("Cmd snapshot add output for session %s", session->name); | |
3533 | ||
3534 | /* | |
903ef685 | 3535 | * Can't create an output if the session is not set in no-output mode. |
6dc3064a DG |
3536 | */ |
3537 | if (session->output_traces) { | |
903ef685 | 3538 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3539 | goto error; |
3540 | } | |
3541 | ||
3542 | /* Only one output is allowed until we have the "tee" feature. */ | |
3543 | if (session->snapshot.nb_output == 1) { | |
3544 | ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST; | |
3545 | goto error; | |
3546 | } | |
3547 | ||
3548 | new_output = snapshot_output_alloc(); | |
3549 | if (!new_output) { | |
3550 | ret = LTTNG_ERR_NOMEM; | |
3551 | goto error; | |
3552 | } | |
3553 | ||
3554 | ret = snapshot_output_init(output->max_size, output->name, | |
3555 | output->ctrl_url, output->data_url, session->consumer, new_output, | |
3556 | &session->snapshot); | |
3557 | if (ret < 0) { | |
3558 | if (ret == -ENOMEM) { | |
3559 | ret = LTTNG_ERR_NOMEM; | |
3560 | } else { | |
3561 | ret = LTTNG_ERR_INVALID; | |
3562 | } | |
3563 | goto free_error; | |
3564 | } | |
3565 | ||
6dc3064a DG |
3566 | rcu_read_lock(); |
3567 | snapshot_add_output(&session->snapshot, new_output); | |
3568 | if (id) { | |
3569 | *id = new_output->id; | |
3570 | } | |
3571 | rcu_read_unlock(); | |
3572 | ||
3573 | return LTTNG_OK; | |
3574 | ||
3575 | free_error: | |
3576 | snapshot_output_destroy(new_output); | |
3577 | error: | |
3578 | return ret; | |
3579 | } | |
3580 | ||
3581 | /* | |
3582 | * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl. | |
3583 | * | |
3584 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3585 | */ | |
3586 | int cmd_snapshot_del_output(struct ltt_session *session, | |
3587 | struct lttng_snapshot_output *output) | |
3588 | { | |
3589 | int ret; | |
eb240553 | 3590 | struct snapshot_output *sout = NULL; |
6dc3064a DG |
3591 | |
3592 | assert(session); | |
3593 | assert(output); | |
3594 | ||
6dc3064a DG |
3595 | rcu_read_lock(); |
3596 | ||
3597 | /* | |
d3f14b8a MD |
3598 | * Permission denied to create an output if the session is not |
3599 | * set in no output mode. | |
6dc3064a DG |
3600 | */ |
3601 | if (session->output_traces) { | |
903ef685 | 3602 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3603 | goto error; |
3604 | } | |
3605 | ||
eb240553 DG |
3606 | if (output->id) { |
3607 | DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id, | |
3608 | session->name); | |
3609 | sout = snapshot_find_output_by_id(output->id, &session->snapshot); | |
3610 | } else if (*output->name != '\0') { | |
3611 | DBG("Cmd snapshot del output name %s for session %s", output->name, | |
3612 | session->name); | |
3613 | sout = snapshot_find_output_by_name(output->name, &session->snapshot); | |
3614 | } | |
6dc3064a DG |
3615 | if (!sout) { |
3616 | ret = LTTNG_ERR_INVALID; | |
3617 | goto error; | |
3618 | } | |
3619 | ||
3620 | snapshot_delete_output(&session->snapshot, sout); | |
3621 | snapshot_output_destroy(sout); | |
3622 | ret = LTTNG_OK; | |
3623 | ||
3624 | error: | |
3625 | rcu_read_unlock(); | |
3626 | return ret; | |
3627 | } | |
3628 | ||
3629 | /* | |
3630 | * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl. | |
3631 | * | |
3632 | * If no output is available, outputs is untouched and 0 is returned. | |
3633 | * | |
3634 | * Return the size of the newly allocated outputs or a negative LTTNG_ERR code. | |
3635 | */ | |
3636 | ssize_t cmd_snapshot_list_outputs(struct ltt_session *session, | |
3637 | struct lttng_snapshot_output **outputs) | |
3638 | { | |
3639 | int ret, idx = 0; | |
b223ca94 | 3640 | struct lttng_snapshot_output *list = NULL; |
6dc3064a DG |
3641 | struct lttng_ht_iter iter; |
3642 | struct snapshot_output *output; | |
3643 | ||
3644 | assert(session); | |
3645 | assert(outputs); | |
3646 | ||
3647 | DBG("Cmd snapshot list outputs for session %s", session->name); | |
3648 | ||
3649 | /* | |
d3f14b8a MD |
3650 | * Permission denied to create an output if the session is not |
3651 | * set in no output mode. | |
6dc3064a DG |
3652 | */ |
3653 | if (session->output_traces) { | |
903ef685 JG |
3654 | ret = -LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
3655 | goto end; | |
6dc3064a DG |
3656 | } |
3657 | ||
3658 | if (session->snapshot.nb_output == 0) { | |
3659 | ret = 0; | |
903ef685 | 3660 | goto end; |
6dc3064a DG |
3661 | } |
3662 | ||
3663 | list = zmalloc(session->snapshot.nb_output * sizeof(*list)); | |
3664 | if (!list) { | |
b223ca94 | 3665 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3666 | goto end; |
6dc3064a DG |
3667 | } |
3668 | ||
3669 | /* Copy list from session to the new list object. */ | |
b223ca94 | 3670 | rcu_read_lock(); |
6dc3064a DG |
3671 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter, |
3672 | output, node.node) { | |
3673 | assert(output->consumer); | |
3674 | list[idx].id = output->id; | |
3675 | list[idx].max_size = output->max_size; | |
6ce22875 MD |
3676 | if (lttng_strncpy(list[idx].name, output->name, |
3677 | sizeof(list[idx].name))) { | |
3678 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 3679 | goto error; |
6ce22875 | 3680 | } |
6dc3064a | 3681 | if (output->consumer->type == CONSUMER_DST_LOCAL) { |
6ce22875 | 3682 | if (lttng_strncpy(list[idx].ctrl_url, |
366a9222 | 3683 | output->consumer->dst.session_root_path, |
6ce22875 MD |
3684 | sizeof(list[idx].ctrl_url))) { |
3685 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 3686 | goto error; |
6ce22875 | 3687 | } |
6dc3064a DG |
3688 | } else { |
3689 | /* Control URI. */ | |
3690 | ret = uri_to_str_url(&output->consumer->dst.net.control, | |
3691 | list[idx].ctrl_url, sizeof(list[idx].ctrl_url)); | |
3692 | if (ret < 0) { | |
b223ca94 | 3693 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3694 | goto error; |
6dc3064a DG |
3695 | } |
3696 | ||
3697 | /* Data URI. */ | |
3698 | ret = uri_to_str_url(&output->consumer->dst.net.data, | |
3699 | list[idx].data_url, sizeof(list[idx].data_url)); | |
3700 | if (ret < 0) { | |
b223ca94 | 3701 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3702 | goto error; |
6dc3064a DG |
3703 | } |
3704 | } | |
3705 | idx++; | |
3706 | } | |
3707 | ||
3708 | *outputs = list; | |
b223ca94 JG |
3709 | list = NULL; |
3710 | ret = session->snapshot.nb_output; | |
6dc3064a | 3711 | error: |
903ef685 | 3712 | rcu_read_unlock(); |
b223ca94 | 3713 | free(list); |
903ef685 | 3714 | end: |
b223ca94 | 3715 | return ret; |
6dc3064a DG |
3716 | } |
3717 | ||
93ec662e JD |
3718 | /* |
3719 | * Check if we can regenerate the metadata for this session. | |
3720 | * Only kernel, UST per-uid and non-live sessions are supported. | |
3721 | * | |
3722 | * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise. | |
3723 | */ | |
3724 | static | |
eded6438 | 3725 | int check_regenerate_metadata_support(struct ltt_session *session) |
93ec662e JD |
3726 | { |
3727 | int ret; | |
3728 | ||
3729 | assert(session); | |
3730 | ||
3731 | if (session->live_timer != 0) { | |
3732 | ret = LTTNG_ERR_LIVE_SESSION; | |
3733 | goto end; | |
3734 | } | |
3735 | if (!session->active) { | |
3736 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
3737 | goto end; | |
3738 | } | |
3739 | if (session->ust_session) { | |
3740 | switch (session->ust_session->buffer_type) { | |
3741 | case LTTNG_BUFFER_PER_UID: | |
3742 | break; | |
3743 | case LTTNG_BUFFER_PER_PID: | |
3744 | ret = LTTNG_ERR_PER_PID_SESSION; | |
3745 | goto end; | |
3746 | default: | |
3747 | assert(0); | |
3748 | ret = LTTNG_ERR_UNK; | |
3749 | goto end; | |
3750 | } | |
3751 | } | |
3752 | if (session->consumer->type == CONSUMER_DST_NET && | |
3753 | session->consumer->relay_minor_version < 8) { | |
3754 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; | |
3755 | goto end; | |
3756 | } | |
3757 | ret = 0; | |
3758 | ||
3759 | end: | |
3760 | return ret; | |
3761 | } | |
3762 | ||
7802bae3 LL |
3763 | static |
3764 | int clear_metadata_file(int fd) | |
3765 | { | |
3766 | int ret; | |
a5df8828 | 3767 | off_t lseek_ret; |
7802bae3 | 3768 | |
a5df8828 GL |
3769 | lseek_ret = lseek(fd, 0, SEEK_SET); |
3770 | if (lseek_ret < 0) { | |
7802bae3 | 3771 | PERROR("lseek"); |
a5df8828 | 3772 | ret = -1; |
7802bae3 LL |
3773 | goto end; |
3774 | } | |
3775 | ||
3776 | ret = ftruncate(fd, 0); | |
3777 | if (ret < 0) { | |
3778 | PERROR("ftruncate"); | |
3779 | goto end; | |
3780 | } | |
3781 | ||
3782 | end: | |
3783 | return ret; | |
3784 | } | |
3785 | ||
93ec662e | 3786 | static |
eded6438 | 3787 | int ust_regenerate_metadata(struct ltt_ust_session *usess) |
93ec662e JD |
3788 | { |
3789 | int ret = 0; | |
3790 | struct buffer_reg_uid *uid_reg = NULL; | |
3791 | struct buffer_reg_session *session_reg = NULL; | |
3792 | ||
3793 | rcu_read_lock(); | |
3794 | cds_list_for_each_entry(uid_reg, &usess->buffer_reg_uid_list, lnode) { | |
3795 | struct ust_registry_session *registry; | |
3796 | struct ust_registry_channel *chan; | |
3797 | struct lttng_ht_iter iter_chan; | |
3798 | ||
3799 | session_reg = uid_reg->registry; | |
3800 | registry = session_reg->reg.ust; | |
3801 | ||
3802 | pthread_mutex_lock(®istry->lock); | |
3803 | registry->metadata_len_sent = 0; | |
3804 | memset(registry->metadata, 0, registry->metadata_alloc_len); | |
3805 | registry->metadata_len = 0; | |
3806 | registry->metadata_version++; | |
7802bae3 LL |
3807 | if (registry->metadata_fd > 0) { |
3808 | /* Clear the metadata file's content. */ | |
3809 | ret = clear_metadata_file(registry->metadata_fd); | |
3810 | if (ret) { | |
3811 | pthread_mutex_unlock(®istry->lock); | |
3812 | goto end; | |
3813 | } | |
3814 | } | |
3815 | ||
93ec662e JD |
3816 | ret = ust_metadata_session_statedump(registry, NULL, |
3817 | registry->major, registry->minor); | |
3818 | if (ret) { | |
3819 | pthread_mutex_unlock(®istry->lock); | |
3820 | ERR("Failed to generate session metadata (err = %d)", | |
3821 | ret); | |
3822 | goto end; | |
3823 | } | |
3824 | cds_lfht_for_each_entry(registry->channels->ht, &iter_chan.iter, | |
3825 | chan, node.node) { | |
3826 | struct ust_registry_event *event; | |
3827 | struct lttng_ht_iter iter_event; | |
3828 | ||
3829 | ret = ust_metadata_channel_statedump(registry, chan); | |
3830 | if (ret) { | |
3831 | pthread_mutex_unlock(®istry->lock); | |
3832 | ERR("Failed to generate channel metadata " | |
3833 | "(err = %d)", ret); | |
3834 | goto end; | |
3835 | } | |
3836 | cds_lfht_for_each_entry(chan->ht->ht, &iter_event.iter, | |
3837 | event, node.node) { | |
3838 | ret = ust_metadata_event_statedump(registry, | |
3839 | chan, event); | |
3840 | if (ret) { | |
3841 | pthread_mutex_unlock(®istry->lock); | |
3842 | ERR("Failed to generate event metadata " | |
3843 | "(err = %d)", ret); | |
3844 | goto end; | |
3845 | } | |
3846 | } | |
3847 | } | |
3848 | pthread_mutex_unlock(®istry->lock); | |
3849 | } | |
3850 | ||
3851 | end: | |
3852 | rcu_read_unlock(); | |
3853 | return ret; | |
3854 | } | |
3855 | ||
3856 | /* | |
eded6438 | 3857 | * Command LTTNG_REGENERATE_METADATA from the lttng-ctl library. |
93ec662e JD |
3858 | * |
3859 | * Ask the consumer to truncate the existing metadata file(s) and | |
3860 | * then regenerate the metadata. Live and per-pid sessions are not | |
3861 | * supported and return an error. | |
3862 | * | |
3863 | * Return 0 on success or else a LTTNG_ERR code. | |
3864 | */ | |
eded6438 | 3865 | int cmd_regenerate_metadata(struct ltt_session *session) |
93ec662e JD |
3866 | { |
3867 | int ret; | |
3868 | ||
3869 | assert(session); | |
3870 | ||
eded6438 | 3871 | ret = check_regenerate_metadata_support(session); |
93ec662e JD |
3872 | if (ret) { |
3873 | goto end; | |
3874 | } | |
3875 | ||
3876 | if (session->kernel_session) { | |
eded6438 | 3877 | ret = kernctl_session_regenerate_metadata( |
93ec662e JD |
3878 | session->kernel_session->fd); |
3879 | if (ret < 0) { | |
3880 | ERR("Failed to regenerate the kernel metadata"); | |
3881 | goto end; | |
3882 | } | |
3883 | } | |
3884 | ||
3885 | if (session->ust_session) { | |
eded6438 | 3886 | ret = ust_regenerate_metadata(session->ust_session); |
93ec662e JD |
3887 | if (ret < 0) { |
3888 | ERR("Failed to regenerate the UST metadata"); | |
3889 | goto end; | |
3890 | } | |
3891 | } | |
3892 | DBG("Cmd metadata regenerate for session %s", session->name); | |
3893 | ret = LTTNG_OK; | |
3894 | ||
3895 | end: | |
3896 | return ret; | |
3897 | } | |
3898 | ||
c2561365 JD |
3899 | /* |
3900 | * Command LTTNG_REGENERATE_STATEDUMP from the lttng-ctl library. | |
3901 | * | |
3902 | * Ask the tracer to regenerate a new statedump. | |
3903 | * | |
3904 | * Return 0 on success or else a LTTNG_ERR code. | |
3905 | */ | |
3906 | int cmd_regenerate_statedump(struct ltt_session *session) | |
3907 | { | |
3908 | int ret; | |
3909 | ||
3910 | assert(session); | |
3911 | ||
3912 | if (!session->active) { | |
3913 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
3914 | goto end; | |
3915 | } | |
c2561365 JD |
3916 | |
3917 | if (session->kernel_session) { | |
3918 | ret = kernctl_session_regenerate_statedump( | |
3919 | session->kernel_session->fd); | |
3920 | /* | |
3921 | * Currently, the statedump in kernel can only fail if out | |
3922 | * of memory. | |
3923 | */ | |
3924 | if (ret < 0) { | |
3925 | if (ret == -ENOMEM) { | |
3926 | ret = LTTNG_ERR_REGEN_STATEDUMP_NOMEM; | |
3927 | } else { | |
3928 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
3929 | } | |
3930 | ERR("Failed to regenerate the kernel statedump"); | |
3931 | goto end; | |
3932 | } | |
3933 | } | |
3934 | ||
3935 | if (session->ust_session) { | |
3936 | ret = ust_app_regenerate_statedump_all(session->ust_session); | |
3937 | /* | |
3938 | * Currently, the statedump in UST always returns 0. | |
3939 | */ | |
3940 | if (ret < 0) { | |
3941 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
3942 | ERR("Failed to regenerate the UST statedump"); | |
3943 | goto end; | |
3944 | } | |
3945 | } | |
3946 | DBG("Cmd regenerate statedump for session %s", session->name); | |
3947 | ret = LTTNG_OK; | |
3948 | ||
3949 | end: | |
3950 | return ret; | |
3951 | } | |
3952 | ||
b0880ae5 JG |
3953 | int cmd_register_trigger(struct command_ctx *cmd_ctx, int sock, |
3954 | struct notification_thread_handle *notification_thread) | |
3955 | { | |
3956 | int ret; | |
3957 | size_t trigger_len; | |
3958 | ssize_t sock_recv_len; | |
3959 | struct lttng_trigger *trigger = NULL; | |
3960 | struct lttng_buffer_view view; | |
3961 | struct lttng_dynamic_buffer trigger_buffer; | |
3962 | ||
3963 | lttng_dynamic_buffer_init(&trigger_buffer); | |
3964 | trigger_len = (size_t) cmd_ctx->lsm->u.trigger.length; | |
3965 | ret = lttng_dynamic_buffer_set_size(&trigger_buffer, trigger_len); | |
3966 | if (ret) { | |
3967 | ret = LTTNG_ERR_NOMEM; | |
3968 | goto end; | |
3969 | } | |
3970 | ||
3971 | sock_recv_len = lttcomm_recv_unix_sock(sock, trigger_buffer.data, | |
3972 | trigger_len); | |
3973 | if (sock_recv_len < 0 || sock_recv_len != trigger_len) { | |
3974 | ERR("Failed to receive \"register trigger\" command payload"); | |
3975 | /* TODO: should this be a new error enum ? */ | |
3976 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
3977 | goto end; | |
3978 | } | |
3979 | ||
3980 | view = lttng_buffer_view_from_dynamic_buffer(&trigger_buffer, 0, -1); | |
3981 | if (lttng_trigger_create_from_buffer(&view, &trigger) != | |
3982 | trigger_len) { | |
3983 | ERR("Invalid trigger payload received in \"register trigger\" command"); | |
3984 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
3985 | goto end; | |
3986 | } | |
3987 | ||
3988 | ret = notification_thread_command_register_trigger(notification_thread, | |
3989 | trigger); | |
587f9fd0 JG |
3990 | /* Ownership of trigger was transferred. */ |
3991 | trigger = NULL; | |
b0880ae5 | 3992 | end: |
587f9fd0 | 3993 | lttng_trigger_destroy(trigger); |
b0880ae5 JG |
3994 | lttng_dynamic_buffer_reset(&trigger_buffer); |
3995 | return ret; | |
3996 | } | |
3997 | ||
3998 | int cmd_unregister_trigger(struct command_ctx *cmd_ctx, int sock, | |
3999 | struct notification_thread_handle *notification_thread) | |
4000 | { | |
4001 | int ret; | |
4002 | size_t trigger_len; | |
4003 | ssize_t sock_recv_len; | |
4004 | struct lttng_trigger *trigger = NULL; | |
4005 | struct lttng_buffer_view view; | |
4006 | struct lttng_dynamic_buffer trigger_buffer; | |
4007 | ||
4008 | lttng_dynamic_buffer_init(&trigger_buffer); | |
4009 | trigger_len = (size_t) cmd_ctx->lsm->u.trigger.length; | |
4010 | ret = lttng_dynamic_buffer_set_size(&trigger_buffer, trigger_len); | |
4011 | if (ret) { | |
4012 | ret = LTTNG_ERR_NOMEM; | |
4013 | goto end; | |
4014 | } | |
4015 | ||
4016 | sock_recv_len = lttcomm_recv_unix_sock(sock, trigger_buffer.data, | |
4017 | trigger_len); | |
4018 | if (sock_recv_len < 0 || sock_recv_len != trigger_len) { | |
4019 | ERR("Failed to receive \"unregister trigger\" command payload"); | |
4020 | /* TODO: should this be a new error enum ? */ | |
4021 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
4022 | goto end; | |
4023 | } | |
4024 | ||
4025 | view = lttng_buffer_view_from_dynamic_buffer(&trigger_buffer, 0, -1); | |
4026 | if (lttng_trigger_create_from_buffer(&view, &trigger) != | |
4027 | trigger_len) { | |
4028 | ERR("Invalid trigger payload received in \"unregister trigger\" command"); | |
4029 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
4030 | goto end; | |
4031 | } | |
4032 | ||
4033 | ret = notification_thread_command_unregister_trigger(notification_thread, | |
4034 | trigger); | |
4035 | end: | |
587f9fd0 | 4036 | lttng_trigger_destroy(trigger); |
b0880ae5 JG |
4037 | lttng_dynamic_buffer_reset(&trigger_buffer); |
4038 | return ret; | |
4039 | } | |
4040 | ||
6dc3064a DG |
4041 | /* |
4042 | * Send relayd sockets from snapshot output to consumer. Ignore request if the | |
4043 | * snapshot output is *not* set with a remote destination. | |
4044 | * | |
a934f4af | 4045 | * Return 0 on success or a LTTNG_ERR code. |
6dc3064a DG |
4046 | */ |
4047 | static int set_relayd_for_snapshot(struct consumer_output *consumer, | |
4048 | struct snapshot_output *snap_output, struct ltt_session *session) | |
4049 | { | |
a934f4af | 4050 | int ret = LTTNG_OK; |
6dc3064a DG |
4051 | struct lttng_ht_iter iter; |
4052 | struct consumer_socket *socket; | |
4053 | ||
4054 | assert(consumer); | |
4055 | assert(snap_output); | |
4056 | assert(session); | |
4057 | ||
4058 | DBG2("Set relayd object from snapshot output"); | |
4059 | ||
4060 | /* Ignore if snapshot consumer output is not network. */ | |
4061 | if (snap_output->consumer->type != CONSUMER_DST_NET) { | |
4062 | goto error; | |
4063 | } | |
4064 | ||
4065 | /* | |
4066 | * For each consumer socket, create and send the relayd object of the | |
4067 | * snapshot output. | |
4068 | */ | |
4069 | rcu_read_lock(); | |
5eecee74 DG |
4070 | cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter, |
4071 | socket, node.node) { | |
ecd0f96d | 4072 | pthread_mutex_lock(socket->lock); |
6dc3064a | 4073 | ret = send_consumer_relayd_sockets(0, session->id, |
d3e2ba59 JD |
4074 | snap_output->consumer, socket, |
4075 | session->name, session->hostname, | |
4076 | session->live_timer); | |
ecd0f96d | 4077 | pthread_mutex_unlock(socket->lock); |
a934f4af | 4078 | if (ret != LTTNG_OK) { |
6dc3064a DG |
4079 | rcu_read_unlock(); |
4080 | goto error; | |
4081 | } | |
4082 | } | |
4083 | rcu_read_unlock(); | |
4084 | ||
4085 | error: | |
4086 | return ret; | |
4087 | } | |
4088 | ||
4089 | /* | |
4090 | * Record a kernel snapshot. | |
4091 | * | |
fac41e72 | 4092 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a DG |
4093 | */ |
4094 | static int record_kernel_snapshot(struct ltt_kernel_session *ksess, | |
5c786ded | 4095 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 4096 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
4097 | { |
4098 | int ret; | |
4099 | ||
4100 | assert(ksess); | |
4101 | assert(output); | |
4102 | assert(session); | |
4103 | ||
10a50311 | 4104 | |
af706bb7 DG |
4105 | /* |
4106 | * Copy kernel session sockets so we can communicate with the right | |
4107 | * consumer for the snapshot record command. | |
4108 | */ | |
4109 | ret = consumer_copy_sockets(output->consumer, ksess->consumer); | |
4110 | if (ret < 0) { | |
a934f4af | 4111 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 4112 | goto error; |
6dc3064a DG |
4113 | } |
4114 | ||
4115 | ret = set_relayd_for_snapshot(ksess->consumer, output, session); | |
a934f4af | 4116 | if (ret != LTTNG_OK) { |
af706bb7 | 4117 | goto error_snapshot; |
6dc3064a DG |
4118 | } |
4119 | ||
d07ceecd | 4120 | ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream); |
2a06df8d | 4121 | if (ret != LTTNG_OK) { |
af706bb7 | 4122 | goto error_snapshot; |
6dc3064a DG |
4123 | } |
4124 | ||
a934f4af | 4125 | ret = LTTNG_OK; |
1371fc12 | 4126 | goto end; |
a934f4af | 4127 | |
af706bb7 DG |
4128 | error_snapshot: |
4129 | /* Clean up copied sockets so this output can use some other later on. */ | |
4130 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a | 4131 | error: |
1371fc12 | 4132 | end: |
6dc3064a DG |
4133 | return ret; |
4134 | } | |
4135 | ||
4136 | /* | |
4137 | * Record a UST snapshot. | |
4138 | * | |
a934f4af | 4139 | * Return 0 on success or a LTTNG_ERR error code. |
6dc3064a DG |
4140 | */ |
4141 | static int record_ust_snapshot(struct ltt_ust_session *usess, | |
5c786ded | 4142 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 4143 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
4144 | { |
4145 | int ret; | |
4146 | ||
4147 | assert(usess); | |
4148 | assert(output); | |
4149 | assert(session); | |
4150 | ||
af706bb7 | 4151 | /* |
d3f14b8a | 4152 | * Copy UST session sockets so we can communicate with the right |
af706bb7 DG |
4153 | * consumer for the snapshot record command. |
4154 | */ | |
4155 | ret = consumer_copy_sockets(output->consumer, usess->consumer); | |
4156 | if (ret < 0) { | |
a934f4af | 4157 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 4158 | goto error; |
6dc3064a DG |
4159 | } |
4160 | ||
4161 | ret = set_relayd_for_snapshot(usess->consumer, output, session); | |
a934f4af | 4162 | if (ret != LTTNG_OK) { |
af706bb7 | 4163 | goto error_snapshot; |
6dc3064a DG |
4164 | } |
4165 | ||
d07ceecd | 4166 | ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream); |
6dc3064a | 4167 | if (ret < 0) { |
7badf927 DG |
4168 | switch (-ret) { |
4169 | case EINVAL: | |
a934f4af | 4170 | ret = LTTNG_ERR_INVALID; |
7badf927 | 4171 | break; |
7badf927 DG |
4172 | default: |
4173 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
4174 | break; | |
5c786ded | 4175 | } |
af706bb7 | 4176 | goto error_snapshot; |
6dc3064a DG |
4177 | } |
4178 | ||
a934f4af DG |
4179 | ret = LTTNG_OK; |
4180 | ||
af706bb7 DG |
4181 | error_snapshot: |
4182 | /* Clean up copied sockets so this output can use some other later on. */ | |
4183 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a DG |
4184 | error: |
4185 | return ret; | |
4186 | } | |
4187 | ||
d07ceecd MD |
4188 | static |
4189 | uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session, | |
4190 | uint64_t cur_nr_packets) | |
68808f4e | 4191 | { |
d07ceecd | 4192 | uint64_t tot_size = 0; |
68808f4e DG |
4193 | |
4194 | if (session->kernel_session) { | |
4195 | struct ltt_kernel_channel *chan; | |
4196 | struct ltt_kernel_session *ksess = session->kernel_session; | |
4197 | ||
68808f4e | 4198 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
d07ceecd MD |
4199 | if (cur_nr_packets >= chan->channel->attr.num_subbuf) { |
4200 | /* | |
4201 | * Don't take channel into account if we | |
4202 | * already grab all its packets. | |
4203 | */ | |
4204 | continue; | |
68808f4e | 4205 | } |
d07ceecd MD |
4206 | tot_size += chan->channel->attr.subbuf_size |
4207 | * chan->stream_count; | |
68808f4e DG |
4208 | } |
4209 | } | |
4210 | ||
4211 | if (session->ust_session) { | |
68808f4e DG |
4212 | struct ltt_ust_session *usess = session->ust_session; |
4213 | ||
d07ceecd MD |
4214 | tot_size += ust_app_get_size_one_more_packet_per_stream(usess, |
4215 | cur_nr_packets); | |
68808f4e DG |
4216 | } |
4217 | ||
d07ceecd | 4218 | return tot_size; |
68808f4e DG |
4219 | } |
4220 | ||
5c786ded | 4221 | /* |
d07ceecd MD |
4222 | * Calculate the number of packets we can grab from each stream that |
4223 | * fits within the overall snapshot max size. | |
4224 | * | |
4225 | * Returns -1 on error, 0 means infinite number of packets, else > 0 is | |
4226 | * the number of packets per stream. | |
4227 | * | |
4228 | * TODO: this approach is not perfect: we consider the worse case | |
4229 | * (packet filling the sub-buffers) as an upper bound, but we could do | |
4230 | * better if we do this calculation while we actually grab the packet | |
4231 | * content: we would know how much padding we don't actually store into | |
4232 | * the file. | |
4233 | * | |
4234 | * This algorithm is currently bounded by the number of packets per | |
4235 | * stream. | |
4236 | * | |
4237 | * Since we call this algorithm before actually grabbing the data, it's | |
4238 | * an approximation: for instance, applications could appear/disappear | |
4239 | * in between this call and actually grabbing data. | |
5c786ded | 4240 | */ |
d07ceecd MD |
4241 | static |
4242 | int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size) | |
5c786ded | 4243 | { |
d07ceecd MD |
4244 | int64_t size_left; |
4245 | uint64_t cur_nb_packets = 0; | |
5c786ded | 4246 | |
d07ceecd MD |
4247 | if (!max_size) { |
4248 | return 0; /* Infinite */ | |
5c786ded JD |
4249 | } |
4250 | ||
d07ceecd MD |
4251 | size_left = max_size; |
4252 | for (;;) { | |
4253 | uint64_t one_more_packet_tot_size; | |
5c786ded | 4254 | |
d07ceecd MD |
4255 | one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session, |
4256 | cur_nb_packets); | |
4257 | if (!one_more_packet_tot_size) { | |
4258 | /* We are already grabbing all packets. */ | |
4259 | break; | |
4260 | } | |
4261 | size_left -= one_more_packet_tot_size; | |
4262 | if (size_left < 0) { | |
4263 | break; | |
4264 | } | |
4265 | cur_nb_packets++; | |
5c786ded | 4266 | } |
d07ceecd MD |
4267 | if (!cur_nb_packets) { |
4268 | /* Not enough room to grab one packet of each stream, error. */ | |
4269 | return -1; | |
4270 | } | |
4271 | return cur_nb_packets; | |
5c786ded JD |
4272 | } |
4273 | ||
6dc3064a DG |
4274 | /* |
4275 | * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl. | |
4276 | * | |
4277 | * The wait parameter is ignored so this call always wait for the snapshot to | |
4278 | * complete before returning. | |
4279 | * | |
4280 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
4281 | */ | |
4282 | int cmd_snapshot_record(struct ltt_session *session, | |
4283 | struct lttng_snapshot_output *output, int wait) | |
4284 | { | |
4285 | int ret = LTTNG_OK; | |
e1986656 DG |
4286 | unsigned int use_tmp_output = 0; |
4287 | struct snapshot_output tmp_output; | |
00e1dfc4 | 4288 | unsigned int snapshot_success = 0; |
10ba83fe | 4289 | char datetime[16]; |
6dc3064a DG |
4290 | |
4291 | assert(session); | |
ba45d9f0 | 4292 | assert(output); |
6dc3064a DG |
4293 | |
4294 | DBG("Cmd snapshot record for session %s", session->name); | |
4295 | ||
10ba83fe JR |
4296 | /* Get the datetime for the snapshot output directory. */ |
4297 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", datetime, | |
4298 | sizeof(datetime)); | |
4299 | if (!ret) { | |
4300 | ret = LTTNG_ERR_INVALID; | |
4301 | goto error; | |
4302 | } | |
4303 | ||
6dc3064a | 4304 | /* |
d3f14b8a MD |
4305 | * Permission denied to create an output if the session is not |
4306 | * set in no output mode. | |
6dc3064a DG |
4307 | */ |
4308 | if (session->output_traces) { | |
903ef685 | 4309 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
4310 | goto error; |
4311 | } | |
4312 | ||
4313 | /* The session needs to be started at least once. */ | |
8382cf6f | 4314 | if (!session->has_been_started) { |
6dc3064a DG |
4315 | ret = LTTNG_ERR_START_SESSION_ONCE; |
4316 | goto error; | |
4317 | } | |
4318 | ||
4319 | /* Use temporary output for the session. */ | |
ba45d9f0 | 4320 | if (*output->ctrl_url != '\0') { |
6dc3064a DG |
4321 | ret = snapshot_output_init(output->max_size, output->name, |
4322 | output->ctrl_url, output->data_url, session->consumer, | |
e1986656 | 4323 | &tmp_output, NULL); |
6dc3064a DG |
4324 | if (ret < 0) { |
4325 | if (ret == -ENOMEM) { | |
4326 | ret = LTTNG_ERR_NOMEM; | |
4327 | } else { | |
4328 | ret = LTTNG_ERR_INVALID; | |
4329 | } | |
4330 | goto error; | |
4331 | } | |
1bfe7328 DG |
4332 | /* Use the global session count for the temporary snapshot. */ |
4333 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; | |
10ba83fe JR |
4334 | |
4335 | /* Use the global datetime */ | |
4336 | memcpy(tmp_output.datetime, datetime, sizeof(datetime)); | |
e1986656 | 4337 | use_tmp_output = 1; |
6dc3064a DG |
4338 | } |
4339 | ||
804c90a8 JR |
4340 | if (use_tmp_output) { |
4341 | int64_t nb_packets_per_stream; | |
6dc3064a | 4342 | |
804c90a8 JR |
4343 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, |
4344 | tmp_output.max_size); | |
4345 | if (nb_packets_per_stream < 0) { | |
4346 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
4347 | goto error; | |
4348 | } | |
d07ceecd | 4349 | |
804c90a8 JR |
4350 | if (session->kernel_session) { |
4351 | ret = record_kernel_snapshot(session->kernel_session, | |
4352 | &tmp_output, session, | |
4353 | wait, nb_packets_per_stream); | |
4354 | if (ret != LTTNG_OK) { | |
d07ceecd MD |
4355 | goto error; |
4356 | } | |
804c90a8 JR |
4357 | } |
4358 | ||
4359 | if (session->ust_session) { | |
4360 | ret = record_ust_snapshot(session->ust_session, | |
4361 | &tmp_output, session, | |
d07ceecd | 4362 | wait, nb_packets_per_stream); |
a934f4af | 4363 | if (ret != LTTNG_OK) { |
6dc3064a DG |
4364 | goto error; |
4365 | } | |
804c90a8 | 4366 | } |
e1986656 | 4367 | |
804c90a8 JR |
4368 | snapshot_success = 1; |
4369 | } else { | |
4370 | struct snapshot_output *sout; | |
4371 | struct lttng_ht_iter iter; | |
68808f4e | 4372 | |
804c90a8 JR |
4373 | rcu_read_lock(); |
4374 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
4375 | &iter.iter, sout, node.node) { | |
4376 | int64_t nb_packets_per_stream; | |
e1986656 | 4377 | |
804c90a8 JR |
4378 | /* |
4379 | * Make a local copy of the output and assign the possible | |
4380 | * temporary value given by the caller. | |
4381 | */ | |
4382 | memset(&tmp_output, 0, sizeof(tmp_output)); | |
4383 | memcpy(&tmp_output, sout, sizeof(tmp_output)); | |
1bfe7328 | 4384 | |
804c90a8 JR |
4385 | if (output->max_size != (uint64_t) -1ULL) { |
4386 | tmp_output.max_size = output->max_size; | |
6dc3064a | 4387 | } |
d07ceecd MD |
4388 | |
4389 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
4390 | tmp_output.max_size); | |
4391 | if (nb_packets_per_stream < 0) { | |
4392 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
804c90a8 | 4393 | rcu_read_unlock(); |
d07ceecd MD |
4394 | goto error; |
4395 | } | |
6dc3064a | 4396 | |
804c90a8 JR |
4397 | /* Use temporary name. */ |
4398 | if (*output->name != '\0') { | |
cf3e357d MD |
4399 | if (lttng_strncpy(tmp_output.name, output->name, |
4400 | sizeof(tmp_output.name))) { | |
4401 | ret = LTTNG_ERR_INVALID; | |
4402 | rcu_read_unlock(); | |
4403 | goto error; | |
4404 | } | |
804c90a8 | 4405 | } |
e1986656 | 4406 | |
804c90a8 | 4407 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; |
10ba83fe | 4408 | memcpy(tmp_output.datetime, datetime, sizeof(datetime)); |
e1986656 | 4409 | |
804c90a8 JR |
4410 | if (session->kernel_session) { |
4411 | ret = record_kernel_snapshot(session->kernel_session, | |
4412 | &tmp_output, session, | |
4413 | wait, nb_packets_per_stream); | |
4414 | if (ret != LTTNG_OK) { | |
d07ceecd | 4415 | rcu_read_unlock(); |
68808f4e DG |
4416 | goto error; |
4417 | } | |
804c90a8 | 4418 | } |
68808f4e | 4419 | |
804c90a8 JR |
4420 | if (session->ust_session) { |
4421 | ret = record_ust_snapshot(session->ust_session, | |
4422 | &tmp_output, session, | |
d07ceecd | 4423 | wait, nb_packets_per_stream); |
a934f4af | 4424 | if (ret != LTTNG_OK) { |
6dc3064a DG |
4425 | rcu_read_unlock(); |
4426 | goto error; | |
4427 | } | |
4428 | } | |
804c90a8 | 4429 | snapshot_success = 1; |
6dc3064a | 4430 | } |
804c90a8 | 4431 | rcu_read_unlock(); |
6dc3064a DG |
4432 | } |
4433 | ||
1bfe7328 DG |
4434 | if (snapshot_success) { |
4435 | session->snapshot.nb_snapshot++; | |
b67578cb MD |
4436 | } else { |
4437 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
1bfe7328 DG |
4438 | } |
4439 | ||
6dc3064a | 4440 | error: |
6dc3064a DG |
4441 | return ret; |
4442 | } | |
4443 | ||
d7ba1388 MD |
4444 | /* |
4445 | * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread. | |
4446 | */ | |
4447 | int cmd_set_session_shm_path(struct ltt_session *session, | |
4448 | const char *shm_path) | |
4449 | { | |
4450 | /* Safety net */ | |
4451 | assert(session); | |
4452 | ||
4453 | /* | |
4454 | * Can only set shm path before session is started. | |
4455 | */ | |
4456 | if (session->has_been_started) { | |
4457 | return LTTNG_ERR_SESSION_STARTED; | |
4458 | } | |
4459 | ||
4460 | strncpy(session->shm_path, shm_path, | |
4461 | sizeof(session->shm_path)); | |
4462 | session->shm_path[sizeof(session->shm_path) - 1] = '\0'; | |
4463 | ||
4464 | return 0; | |
4465 | } | |
4466 | ||
5c408ad8 JD |
4467 | /* |
4468 | * Command LTTNG_ROTATE_SESSION from the lttng-ctl library. | |
4469 | * | |
4470 | * Ask the consumer to rotate the session output directory. | |
4471 | * The session lock must be held. | |
4472 | * | |
4473 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
4474 | */ | |
4475 | int cmd_rotate_session(struct ltt_session *session, | |
4476 | struct lttng_rotate_session_return *rotate_return) | |
4477 | { | |
4478 | int ret; | |
4479 | size_t strf_ret; | |
4480 | struct tm *timeinfo; | |
fc58be13 | 4481 | char datetime[21]; |
5c408ad8 JD |
4482 | time_t now; |
4483 | bool ust_active = false; | |
4484 | ||
4485 | assert(session); | |
4486 | ||
4487 | if (!session->has_been_started) { | |
4488 | ret = -LTTNG_ERR_START_SESSION_ONCE; | |
d68c9a04 | 4489 | goto end; |
5c408ad8 JD |
4490 | } |
4491 | ||
4492 | if (session->live_timer || session->snapshot_mode || | |
4493 | !session->output_traces) { | |
4494 | ret = -LTTNG_ERR_ROTATION_NOT_AVAILABLE; | |
d68c9a04 | 4495 | goto end; |
5c408ad8 JD |
4496 | } |
4497 | ||
4498 | /* | |
4499 | * Unsupported feature in lttng-relayd before 2.11. | |
4500 | */ | |
4501 | if (session->consumer->type == CONSUMER_DST_NET && | |
4502 | (session->consumer->relay_major_version == 2 && | |
4503 | session->consumer->relay_minor_version < 11)) { | |
504521ea | 4504 | ret = -LTTNG_ERR_ROTATION_NOT_AVAILABLE_RELAY; |
d68c9a04 | 4505 | goto end; |
5c408ad8 JD |
4506 | } |
4507 | ||
4508 | if (session->rotate_pending || session->rotate_pending_relay) { | |
4509 | ret = -LTTNG_ERR_ROTATION_PENDING; | |
4510 | DBG("Rotate already in progress"); | |
d68c9a04 | 4511 | goto end; |
5c408ad8 JD |
4512 | } |
4513 | ||
4514 | /* | |
4515 | * After a stop, we only allow one rotation to occur, the other ones are | |
4516 | * useless until a new start. | |
4517 | */ | |
4518 | if (session->rotated_after_last_stop) { | |
4519 | DBG("Session \"%s\" was already rotated after stop, refusing rotation", | |
4520 | session->name); | |
4521 | ret = -LTTNG_ERR_ROTATION_MULTIPLE_AFTER_STOP; | |
d68c9a04 | 4522 | goto end; |
5c408ad8 JD |
4523 | } |
4524 | ||
4525 | /* Special case for the first rotation. */ | |
ad9f5c17 | 4526 | if (session->current_archive_id == 0) { |
5c408ad8 JD |
4527 | const char *base_path = NULL; |
4528 | ||
4529 | /* Either one of the two sessions is enough to get the root path. */ | |
4530 | if (session->kernel_session) { | |
4531 | base_path = session_get_base_path(session); | |
4532 | } else if (session->ust_session) { | |
4533 | base_path = session_get_base_path(session); | |
4534 | } else { | |
4535 | assert(0); | |
4536 | } | |
4537 | assert(base_path); | |
4538 | ret = lttng_strncpy(session->rotation_chunk.current_rotate_path, | |
4539 | base_path, | |
4540 | sizeof(session->rotation_chunk.current_rotate_path)); | |
4541 | if (ret) { | |
4542 | ERR("Failed to copy session base path to current rotation chunk path"); | |
4543 | ret = -LTTNG_ERR_UNK; | |
d68c9a04 | 4544 | goto end; |
5c408ad8 JD |
4545 | } |
4546 | } else { | |
4547 | /* | |
4548 | * The currently active tracing path is now the folder we | |
4549 | * want to rotate. | |
4550 | */ | |
4551 | ret = lttng_strncpy(session->rotation_chunk.current_rotate_path, | |
4552 | session->rotation_chunk.active_tracing_path, | |
4553 | sizeof(session->rotation_chunk.current_rotate_path)); | |
4554 | if (ret) { | |
4555 | ERR("Failed to copy the active tracing path to the current rotate path"); | |
4556 | ret = -LTTNG_ERR_UNK; | |
d68c9a04 | 4557 | goto end; |
5c408ad8 JD |
4558 | } |
4559 | } | |
4560 | DBG("Current rotate path %s", session->rotation_chunk.current_rotate_path); | |
4561 | ||
ad9f5c17 | 4562 | session->current_archive_id++; |
5c408ad8 | 4563 | session->rotate_pending = true; |
d68c9a04 | 4564 | session->rotation_state = LTTNG_ROTATION_STATE_ONGOING; |
0ca52944 JG |
4565 | ret = notification_thread_command_session_rotation_ongoing( |
4566 | notification_thread_handle, | |
17dd1232 JG |
4567 | session->name, session->uid, session->gid, |
4568 | session->current_archive_id); | |
4569 | if (ret != LTTNG_OK) { | |
4570 | ERR("Failed to notify notification thread that a session rotation is ongoing for session %s", | |
4571 | session->name); | |
0ca52944 | 4572 | } |
5c408ad8 JD |
4573 | |
4574 | /* | |
4575 | * Create the path name for the next chunk. | |
4576 | */ | |
4577 | now = time(NULL); | |
4578 | if (now == (time_t) -1) { | |
4579 | ret = -LTTNG_ERR_ROTATION_NOT_AVAILABLE; | |
d68c9a04 | 4580 | goto end; |
5c408ad8 JD |
4581 | } |
4582 | session->last_chunk_start_ts = session->current_chunk_start_ts; | |
4583 | session->current_chunk_start_ts = now; | |
4584 | ||
4585 | timeinfo = localtime(&now); | |
4586 | if (!timeinfo) { | |
4587 | PERROR("Failed to sample local time in rotate session command"); | |
4588 | ret = -LTTNG_ERR_UNK; | |
d68c9a04 | 4589 | goto end; |
5c408ad8 | 4590 | } |
fc58be13 | 4591 | strf_ret = strftime(datetime, sizeof(datetime), "%Y%m%dT%H%M%S%z", |
5c408ad8 JD |
4592 | timeinfo); |
4593 | if (!strf_ret) { | |
4594 | ERR("Failed to format local time timestamp in rotate session command"); | |
4595 | ret = -LTTNG_ERR_UNK; | |
d68c9a04 | 4596 | goto end; |
5c408ad8 JD |
4597 | } |
4598 | if (session->kernel_session) { | |
4599 | /* | |
4600 | * The active path for the next rotation/destroy. | |
4601 | * Ex: ~/lttng-traces/auto-20170922-111748/20170922-111754-42 | |
4602 | */ | |
4603 | ret = snprintf(session->rotation_chunk.active_tracing_path, | |
4604 | sizeof(session->rotation_chunk.active_tracing_path), | |
4605 | "%s/%s-%" PRIu64, | |
4606 | session_get_base_path(session), | |
ad9f5c17 | 4607 | datetime, session->current_archive_id + 1); |
5c408ad8 JD |
4608 | if (ret < 0 || ret == sizeof(session->rotation_chunk.active_tracing_path)) { |
4609 | ERR("Failed to format active kernel tracing path in rotate session command"); | |
4610 | ret = -LTTNG_ERR_UNK; | |
d68c9a04 | 4611 | goto end; |
5c408ad8 JD |
4612 | } |
4613 | /* | |
4614 | * The sub-directory for the consumer | |
4615 | * Ex: /20170922-111754-42/kernel | |
4616 | */ | |
4617 | ret = snprintf(session->kernel_session->consumer->chunk_path, | |
4618 | sizeof(session->kernel_session->consumer->chunk_path), | |
4619 | "/%s-%" PRIu64, datetime, | |
ad9f5c17 | 4620 | session->current_archive_id + 1); |
5c408ad8 JD |
4621 | if (ret < 0 || ret == sizeof(session->kernel_session->consumer->chunk_path)) { |
4622 | ERR("Failed to format the kernel consumer's sub-directory in rotate session command"); | |
4623 | ret = -LTTNG_ERR_UNK; | |
d68c9a04 | 4624 | goto end; |
5c408ad8 JD |
4625 | } |
4626 | /* | |
4627 | * Create the new chunk folder, before the rotation begins so we don't | |
4628 | * race with the consumer/tracer activity. | |
4629 | */ | |
4630 | ret = domain_mkdir(session->kernel_session->consumer, session, | |
4631 | session->kernel_session->uid, | |
4632 | session->kernel_session->gid); | |
4633 | if (ret) { | |
4634 | ERR("Failed to create kernel session tracing path at %s", | |
d68c9a04 JD |
4635 | session->kernel_session->consumer->chunk_path); |
4636 | ret = -LTTNG_ERR_CREATE_DIR_FAIL; | |
4637 | goto end; | |
5c408ad8 JD |
4638 | } |
4639 | ret = kernel_rotate_session(session); | |
4640 | if (ret != LTTNG_OK) { | |
d68c9a04 JD |
4641 | ret = -ret; |
4642 | goto end; | |
5c408ad8 JD |
4643 | } |
4644 | } | |
4645 | if (session->ust_session) { | |
4646 | ret = snprintf(session->rotation_chunk.active_tracing_path, | |
4647 | PATH_MAX, "%s/%s-%" PRIu64, | |
4648 | session_get_base_path(session), | |
ad9f5c17 | 4649 | datetime, session->current_archive_id + 1); |
5c408ad8 JD |
4650 | if (ret < 0) { |
4651 | ERR("Failed to format active UST tracing path in rotate session command"); | |
4652 | ret = -LTTNG_ERR_UNK; | |
d68c9a04 | 4653 | goto end; |
5c408ad8 JD |
4654 | } |
4655 | ret = snprintf(session->ust_session->consumer->chunk_path, | |
4656 | PATH_MAX, "/%s-%" PRIu64, datetime, | |
ad9f5c17 | 4657 | session->current_archive_id + 1); |
5c408ad8 JD |
4658 | if (ret < 0) { |
4659 | ERR("Failed to format the UST consumer's sub-directory in rotate session command"); | |
4660 | ret = -LTTNG_ERR_UNK; | |
d68c9a04 | 4661 | goto end; |
5c408ad8 JD |
4662 | } |
4663 | /* | |
4664 | * Create the new chunk folder, before the rotation begins so we don't | |
4665 | * race with the consumer/tracer activity. | |
4666 | */ | |
4667 | ret = domain_mkdir(session->ust_session->consumer, session, | |
4668 | session->ust_session->uid, | |
4669 | session->ust_session->gid); | |
b019620d JG |
4670 | if (ret) { |
4671 | ret = -LTTNG_ERR_CREATE_DIR_FAIL; | |
4672 | goto end; | |
4673 | } | |
5c408ad8 JD |
4674 | ret = ust_app_rotate_session(session, &ust_active); |
4675 | if (ret != LTTNG_OK) { | |
d68c9a04 | 4676 | goto end; |
5c408ad8 JD |
4677 | } |
4678 | /* | |
4679 | * Handle the case where we did not start a rotation on any channel. | |
4680 | * The consumer will never wake up the rotation thread to perform the | |
4681 | * rename, so we have to do it here while we hold the session and | |
4682 | * session_list locks. | |
4683 | */ | |
4684 | if (!session->kernel_session && !ust_active) { | |
17dd1232 JG |
4685 | struct lttng_trace_archive_location *location; |
4686 | ||
4687 | session->rotate_pending = false; | |
4688 | session->rotation_state = LTTNG_ROTATION_STATE_COMPLETED; | |
5c408ad8 JD |
4689 | ret = rename_complete_chunk(session, now); |
4690 | if (ret < 0) { | |
4691 | ERR("Failed to rename completed rotation chunk"); | |
4692 | goto end; | |
4693 | } | |
17dd1232 JG |
4694 | |
4695 | /* Ownership of location is transferred. */ | |
4696 | location = session_get_trace_archive_location(session); | |
4697 | ret = notification_thread_command_session_rotation_completed( | |
4698 | notification_thread_handle, | |
4699 | session->name, | |
4700 | session->uid, | |
4701 | session->gid, | |
4702 | session->current_archive_id, | |
4703 | location); | |
4704 | if (ret != LTTNG_OK) { | |
4705 | ERR("Failed to notify notification thread that rotation is complete for session %s", | |
4706 | session->name); | |
4707 | } | |
5c408ad8 JD |
4708 | } |
4709 | } | |
4710 | ||
4711 | if (!session->active) { | |
4712 | session->rotated_after_last_stop = true; | |
4713 | } | |
4714 | ||
4715 | if (rotate_return) { | |
ad9f5c17 | 4716 | rotate_return->rotation_id = session->current_archive_id; |
5c408ad8 JD |
4717 | } |
4718 | ||
ad9f5c17 JG |
4719 | DBG("Cmd rotate session %s, current_archive_id %" PRIu64 " sent", |
4720 | session->name, session->current_archive_id); | |
5c408ad8 JD |
4721 | ret = LTTNG_OK; |
4722 | ||
5c408ad8 JD |
4723 | end: |
4724 | return ret; | |
4725 | } | |
4726 | ||
4727 | /* | |
d68c9a04 | 4728 | * Command LTTNG_ROTATION_GET_INFO from the lttng-ctl library. |
5c408ad8 JD |
4729 | * |
4730 | * Check if the session has finished its rotation. | |
4731 | * | |
4732 | * Return 0 on success or else a LTTNG_ERR code. | |
4733 | */ | |
d68c9a04 JD |
4734 | int cmd_rotate_get_info(struct ltt_session *session, |
4735 | struct lttng_rotation_get_info_return *info_return, | |
4736 | uint64_t rotation_id) | |
5c408ad8 JD |
4737 | { |
4738 | int ret; | |
4739 | ||
4740 | assert(session); | |
4741 | ||
d68c9a04 | 4742 | DBG("Cmd rotate_get_info session %s, rotation id %" PRIu64, session->name, |
ad9f5c17 | 4743 | session->current_archive_id); |
5c408ad8 | 4744 | |
ad9f5c17 | 4745 | if (session->current_archive_id != rotation_id) { |
d68c9a04 | 4746 | info_return->status = (int32_t) LTTNG_ROTATION_STATE_EXPIRED; |
5c408ad8 JD |
4747 | ret = LTTNG_OK; |
4748 | goto end; | |
4749 | } | |
4750 | ||
d68c9a04 JD |
4751 | switch (session->rotation_state) { |
4752 | case LTTNG_ROTATION_STATE_ONGOING: | |
4753 | DBG("Reporting that rotation id %" PRIu64 " of session %s is still pending", | |
4754 | rotation_id, session->name); | |
4755 | break; | |
4756 | case LTTNG_ROTATION_STATE_COMPLETED: | |
dd73d57b JG |
4757 | { |
4758 | char *current_tracing_path_reply; | |
4759 | size_t current_tracing_path_reply_len; | |
4760 | ||
4761 | switch (session_get_consumer_destination_type(session)) { | |
4762 | case CONSUMER_DST_LOCAL: | |
4763 | current_tracing_path_reply = | |
4764 | info_return->location.local.absolute_path; | |
4765 | current_tracing_path_reply_len = | |
4766 | sizeof(info_return->location.local.absolute_path); | |
4767 | info_return->location_type = | |
05f8afa9 | 4768 | (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_LOCAL; |
dd73d57b JG |
4769 | break; |
4770 | case CONSUMER_DST_NET: | |
4771 | current_tracing_path_reply = | |
4772 | info_return->location.relay.relative_path; | |
4773 | current_tracing_path_reply_len = | |
4774 | sizeof(info_return->location.relay.relative_path); | |
4775 | /* Currently the only supported relay protocol. */ | |
4776 | info_return->location.relay.protocol = | |
05f8afa9 | 4777 | (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_RELAY_PROTOCOL_TYPE_TCP; |
dd73d57b JG |
4778 | |
4779 | ret = lttng_strncpy(info_return->location.relay.host, | |
4780 | session_get_net_consumer_hostname(session), | |
4781 | sizeof(info_return->location.relay.host)); | |
4782 | if (ret) { | |
4783 | ERR("Failed to host name to rotate_get_info reply"); | |
4784 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; | |
4785 | ret = -LTTNG_ERR_UNK; | |
4786 | goto end; | |
4787 | } | |
4788 | ||
4789 | session_get_net_consumer_ports(session, | |
4790 | &info_return->location.relay.ports.control, | |
4791 | &info_return->location.relay.ports.data); | |
4792 | info_return->location_type = | |
05f8afa9 | 4793 | (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_RELAY; |
dd73d57b JG |
4794 | break; |
4795 | default: | |
4796 | abort(); | |
4797 | } | |
4798 | ret = lttng_strncpy(current_tracing_path_reply, | |
5c408ad8 | 4799 | session->rotation_chunk.current_rotate_path, |
dd73d57b | 4800 | current_tracing_path_reply_len); |
5c408ad8 | 4801 | if (ret) { |
dd73d57b | 4802 | ERR("Failed to copy current tracing path to rotate_get_info reply"); |
d68c9a04 JD |
4803 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; |
4804 | ret = -LTTNG_ERR_UNK; | |
5c408ad8 JD |
4805 | goto end; |
4806 | } | |
dd73d57b | 4807 | |
d68c9a04 | 4808 | break; |
dd73d57b | 4809 | } |
d68c9a04 JD |
4810 | case LTTNG_ROTATION_STATE_ERROR: |
4811 | DBG("Reporting that an error occurred during rotation %" PRIu64 " of session %s", | |
4812 | rotation_id, session->name); | |
4813 | break; | |
4814 | default: | |
4815 | abort(); | |
5c408ad8 JD |
4816 | } |
4817 | ||
d68c9a04 | 4818 | info_return->status = (int32_t) session->rotation_state; |
5c408ad8 | 4819 | ret = LTTNG_OK; |
5c408ad8 JD |
4820 | end: |
4821 | return ret; | |
4822 | } | |
4823 | ||
259c2674 JD |
4824 | /* |
4825 | * Command LTTNG_ROTATION_SET_SCHEDULE from the lttng-ctl library. | |
4826 | * | |
4827 | * Configure the automatic rotation parameters. | |
66ea93b1 JG |
4828 | * 'activate' to true means activate the rotation schedule type with 'new_value'. |
4829 | * 'activate' to false means deactivate the rotation schedule and validate that | |
4830 | * 'new_value' has the same value as the currently active value. | |
259c2674 | 4831 | * |
66ea93b1 | 4832 | * Return 0 on success or else a positive LTTNG_ERR code. |
259c2674 JD |
4833 | */ |
4834 | int cmd_rotation_set_schedule(struct ltt_session *session, | |
66ea93b1 JG |
4835 | bool activate, enum lttng_rotation_schedule_type schedule_type, |
4836 | uint64_t new_value, | |
90936dcf | 4837 | struct notification_thread_handle *notification_thread_handle) |
259c2674 JD |
4838 | { |
4839 | int ret; | |
66ea93b1 | 4840 | uint64_t *parameter_value; |
259c2674 JD |
4841 | |
4842 | assert(session); | |
4843 | ||
4844 | DBG("Cmd rotate set schedule session %s", session->name); | |
4845 | ||
4846 | if (session->live_timer || session->snapshot_mode || | |
4847 | !session->output_traces) { | |
66ea93b1 | 4848 | DBG("Failing ROTATION_SET_SCHEDULE command as the rotation feature is not available for this session"); |
259c2674 JD |
4849 | ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE; |
4850 | goto end; | |
4851 | } | |
4852 | ||
66ea93b1 JG |
4853 | switch (schedule_type) { |
4854 | case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD: | |
4855 | parameter_value = &session->rotate_size; | |
4856 | break; | |
4857 | case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC: | |
4858 | parameter_value = &session->rotate_timer_period; | |
4859 | if (new_value >= UINT_MAX) { | |
4860 | DBG("Failing ROTATION_SET_SCHEDULE command as the value requested for a periodic rotation schedule is invalid: %" PRIu64 " > %u (UINT_MAX)", | |
4861 | new_value, UINT_MAX); | |
4862 | ret = LTTNG_ERR_INVALID; | |
4863 | goto end; | |
4864 | } | |
4865 | break; | |
4866 | default: | |
4867 | WARN("Failing ROTATION_SET_SCHEDULE command on unknown schedule type"); | |
4868 | ret = LTTNG_ERR_INVALID; | |
259c2674 | 4869 | goto end; |
66ea93b1 JG |
4870 | } |
4871 | ||
4872 | /* Improper use of the API. */ | |
4873 | if (new_value == -1ULL) { | |
4874 | WARN("Failing ROTATION_SET_SCHEDULE command as the value requested is -1"); | |
4875 | ret = LTTNG_ERR_INVALID; | |
259c2674 JD |
4876 | goto end; |
4877 | } | |
4878 | ||
66ea93b1 JG |
4879 | /* |
4880 | * As indicated in struct ltt_session's comments, a value of == 0 means | |
4881 | * this schedule rotation type is not in use. | |
4882 | * | |
4883 | * Reject the command if we were asked to activate a schedule that was | |
4884 | * already active. | |
4885 | */ | |
4886 | if (activate && *parameter_value != 0) { | |
4887 | DBG("Failing ROTATION_SET_SCHEDULE (activate) command as the schedule is already active"); | |
4888 | ret = LTTNG_ERR_ROTATION_SCHEDULE_SET; | |
90936dcf | 4889 | goto end; |
66ea93b1 JG |
4890 | } |
4891 | ||
4892 | /* | |
4893 | * Reject the command if we were asked to deactivate a schedule that was | |
4894 | * not active. | |
4895 | */ | |
4896 | if (!activate && *parameter_value == 0) { | |
4897 | DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as the schedule is already inactive"); | |
4898 | ret = LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET; | |
90936dcf JD |
4899 | goto end; |
4900 | } | |
4901 | ||
66ea93b1 JG |
4902 | /* |
4903 | * Reject the command if we were asked to deactivate a schedule that | |
4904 | * doesn't exist. | |
4905 | */ | |
4906 | if (!activate && *parameter_value != new_value) { | |
4907 | DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as an inexistant schedule was provided"); | |
4908 | ret = LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET; | |
4909 | goto end; | |
4910 | } | |
259c2674 | 4911 | |
66ea93b1 JG |
4912 | *parameter_value = activate ? new_value : 0; |
4913 | ||
4914 | switch (schedule_type) { | |
4915 | case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC: | |
4916 | if (activate && session->active) { | |
4917 | /* | |
4918 | * Only start the timer if the session is active, | |
4919 | * otherwise it will be started when the session starts. | |
4920 | */ | |
4921 | ret = sessiond_rotate_timer_start(session, new_value); | |
259c2674 | 4922 | if (ret) { |
66ea93b1 | 4923 | ERR("Failed to enable session rotation timer in ROTATION_SET_SCHEDULE command"); |
259c2674 JD |
4924 | ret = LTTNG_ERR_UNK; |
4925 | goto end; | |
4926 | } | |
66ea93b1 JG |
4927 | } else { |
4928 | ret = sessiond_rotate_timer_stop(session); | |
4929 | if (ret) { | |
4930 | ERR("Failed to disable session rotation timer in ROTATION_SET_SCHEDULE command"); | |
4931 | ret = LTTNG_ERR_UNK; | |
f3ce6946 | 4932 | goto end; |
66ea93b1 | 4933 | } |
259c2674 | 4934 | } |
66ea93b1 JG |
4935 | break; |
4936 | case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD: | |
4937 | if (activate) { | |
4938 | ret = subscribe_session_consumed_size_rotation(session, | |
4939 | new_value, notification_thread_handle); | |
90936dcf | 4940 | if (ret) { |
66ea93b1 | 4941 | ERR("Failed to enable consumed-size notification in ROTATION_SET_SCHEDULE command"); |
90936dcf JD |
4942 | ret = LTTNG_ERR_UNK; |
4943 | goto end; | |
4944 | } | |
90936dcf | 4945 | } else { |
66ea93b1 JG |
4946 | ret = unsubscribe_session_consumed_size_rotation(session, |
4947 | notification_thread_handle); | |
90936dcf | 4948 | if (ret) { |
66ea93b1 | 4949 | ERR("Failed to disable consumed-size notification in ROTATION_SET_SCHEDULE command"); |
90936dcf JD |
4950 | ret = LTTNG_ERR_UNK; |
4951 | goto end; | |
4952 | } | |
66ea93b1 | 4953 | |
90936dcf | 4954 | } |
66ea93b1 JG |
4955 | break; |
4956 | default: | |
4957 | /* Would have been caught before. */ | |
4958 | abort(); | |
90936dcf JD |
4959 | } |
4960 | ||
259c2674 JD |
4961 | ret = LTTNG_OK; |
4962 | ||
4963 | goto end; | |
4964 | ||
4965 | end: | |
4966 | return ret; | |
4967 | } | |
4968 | ||
5c408ad8 JD |
4969 | /* |
4970 | * Command ROTATE_GET_CURRENT_PATH from the lttng-ctl library. | |
4971 | * | |
4972 | * Configure the automatic rotation parameters. | |
4973 | * Set to -1ULL to disable them. | |
4974 | * | |
4975 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
4976 | */ | |
d68c9a04 JD |
4977 | int cmd_session_get_current_output(struct ltt_session *session, |
4978 | struct lttng_session_get_current_output_return *output_return) | |
5c408ad8 JD |
4979 | { |
4980 | int ret; | |
d68c9a04 | 4981 | const char *path; |
5c408ad8 | 4982 | |
d68c9a04 | 4983 | if (!session->snapshot_mode) { |
ad9f5c17 | 4984 | if (session->current_archive_id == 0) { |
d68c9a04 JD |
4985 | if (session->kernel_session) { |
4986 | path = session_get_base_path(session); | |
4987 | } else if (session->ust_session) { | |
4988 | path = session_get_base_path(session); | |
4989 | } else { | |
4990 | abort(); | |
4991 | } | |
4992 | assert(path); | |
4993 | } else { | |
4994 | path = session->rotation_chunk.active_tracing_path; | |
4995 | } | |
4996 | } else { | |
4997 | /* | |
4998 | * A snapshot session does not have a "current" trace archive | |
4999 | * location. | |
5000 | */ | |
5001 | path = ""; | |
5c408ad8 JD |
5002 | } |
5003 | ||
d68c9a04 JD |
5004 | DBG("Cmd get current output for session %s, returning %s", |
5005 | session->name, path); | |
5006 | ||
5007 | ret = lttng_strncpy(output_return->path, | |
5008 | path, | |
5009 | sizeof(output_return->path)); | |
5010 | if (ret) { | |
5011 | ERR("Failed to copy trace output path to session get current output command reply"); | |
5012 | ret = -LTTNG_ERR_UNK; | |
5013 | goto end; | |
5c408ad8 JD |
5014 | } |
5015 | ||
5016 | ret = LTTNG_OK; | |
5c408ad8 JD |
5017 | end: |
5018 | return ret; | |
5019 | } | |
5020 | ||
a503e1ef JG |
5021 | /* Wait for a given path to be removed before continuing. */ |
5022 | static enum lttng_error_code wait_on_path(void *path_data) | |
5023 | { | |
5024 | const char *shm_path = path_data; | |
5025 | ||
5026 | DBG("Waiting for the shm path at %s to be removed before completing session destruction", | |
5027 | shm_path); | |
5028 | while (true) { | |
5029 | int ret; | |
5030 | struct stat st; | |
5031 | ||
5032 | ret = stat(shm_path, &st); | |
5033 | if (ret) { | |
5034 | if (errno != ENOENT) { | |
5035 | PERROR("stat() returned an error while checking for the existence of the shm path"); | |
5036 | } else { | |
5037 | DBG("shm path no longer exists, completing the destruction of session"); | |
5038 | } | |
5039 | break; | |
5040 | } else { | |
5041 | if (!S_ISDIR(st.st_mode)) { | |
5042 | ERR("The type of shm path %s returned by stat() is not a directory; aborting the wait for shm path removal", | |
5043 | shm_path); | |
5044 | break; | |
5045 | } | |
5046 | } | |
5047 | usleep(SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US); | |
5048 | } | |
5049 | return LTTNG_OK; | |
5050 | } | |
5051 | ||
5052 | /* | |
5053 | * Returns a pointer to a handler to run on completion of a command. | |
5054 | * Returns NULL if no handler has to be run for the last command executed. | |
5055 | */ | |
5056 | const struct cmd_completion_handler *cmd_pop_completion_handler(void) | |
5057 | { | |
5058 | struct cmd_completion_handler *handler = current_completion_handler; | |
5059 | ||
5060 | current_completion_handler = NULL; | |
5061 | return handler; | |
5062 | } | |
5063 | ||
2f77fc4b DG |
5064 | /* |
5065 | * Init command subsystem. | |
5066 | */ | |
5067 | void cmd_init(void) | |
5068 | { | |
5069 | /* | |
d88aee68 DG |
5070 | * Set network sequence index to 1 for streams to match a relayd |
5071 | * socket on the consumer side. | |
2f77fc4b | 5072 | */ |
d88aee68 DG |
5073 | pthread_mutex_lock(&relayd_net_seq_idx_lock); |
5074 | relayd_net_seq_idx = 1; | |
5075 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
5076 | |
5077 | DBG("Command subsystem initialized"); | |
5078 | } |