Commit | Line | Data |
---|---|---|
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> |
3c02e545 | 42 | #include <lttng/userspace-probe-internal.h> |
9f449915 | 43 | #include <common/string-utils/string-utils.h> |
2f77fc4b DG |
44 | |
45 | #include "channel.h" | |
46 | #include "consumer.h" | |
47 | #include "event.h" | |
8782cc74 | 48 | #include "health-sessiond.h" |
2f77fc4b DG |
49 | #include "kernel.h" |
50 | #include "kernel-consumer.h" | |
51 | #include "lttng-sessiond.h" | |
52 | #include "utils.h" | |
0dbc2034 | 53 | #include "lttng-syscall.h" |
7c1d2758 | 54 | #include "agent.h" |
93ec662e | 55 | #include "buffer-registry.h" |
b0880ae5 JG |
56 | #include "notification-thread.h" |
57 | #include "notification-thread-commands.h" | |
5c408ad8 JD |
58 | #include "rotate.h" |
59 | #include "rotation-thread.h" | |
60 | #include "sessiond-timer.h" | |
f28f9e44 | 61 | #include "agent-thread.h" |
2f77fc4b DG |
62 | |
63 | #include "cmd.h" | |
64 | ||
a503e1ef JG |
65 | /* Sleep for 100ms between each check for the shm path's deletion. */ |
66 | #define SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US 100000 | |
67 | ||
68 | static enum lttng_error_code wait_on_path(void *path); | |
69 | ||
70 | /* | |
71 | * Command completion handler that is used by the destroy command | |
72 | * when a session that has a non-default shm_path is being destroyed. | |
73 | * | |
74 | * See comment in cmd_destroy_session() for the rationale. | |
75 | */ | |
76 | static struct destroy_completion_handler { | |
77 | struct cmd_completion_handler handler; | |
78 | char shm_path[member_sizeof(struct ltt_session, shm_path)]; | |
79 | } destroy_completion_handler = { | |
80 | .handler = { | |
81 | .run = wait_on_path, | |
82 | .data = destroy_completion_handler.shm_path | |
83 | }, | |
84 | .shm_path = { 0 }, | |
85 | }; | |
86 | ||
87 | static struct cmd_completion_handler *current_completion_handler; | |
88 | ||
2f77fc4b DG |
89 | /* |
90 | * Used to keep a unique index for each relayd socket created where this value | |
91 | * is associated with streams on the consumer so it can match the right relayd | |
d88aee68 DG |
92 | * to send to. It must be accessed with the relayd_net_seq_idx_lock |
93 | * held. | |
2f77fc4b | 94 | */ |
d88aee68 DG |
95 | static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER; |
96 | static uint64_t relayd_net_seq_idx; | |
2f77fc4b | 97 | |
7076b56e JG |
98 | static int validate_ust_event_name(const char *); |
99 | static int cmd_enable_event_internal(struct ltt_session *session, | |
100 | struct lttng_domain *domain, | |
101 | char *channel_name, struct lttng_event *event, | |
102 | char *filter_expression, | |
103 | struct lttng_filter_bytecode *filter, | |
104 | struct lttng_event_exclusion *exclusion, | |
105 | int wpipe); | |
106 | ||
2f77fc4b DG |
107 | /* |
108 | * Create a session path used by list_lttng_sessions for the case that the | |
109 | * session consumer is on the network. | |
110 | */ | |
111 | static int build_network_session_path(char *dst, size_t size, | |
112 | struct ltt_session *session) | |
113 | { | |
114 | int ret, kdata_port, udata_port; | |
115 | struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL; | |
116 | char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX]; | |
117 | ||
118 | assert(session); | |
119 | assert(dst); | |
120 | ||
121 | memset(tmp_urls, 0, sizeof(tmp_urls)); | |
122 | memset(tmp_uurl, 0, sizeof(tmp_uurl)); | |
123 | ||
124 | kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT; | |
125 | ||
126 | if (session->kernel_session && session->kernel_session->consumer) { | |
127 | kuri = &session->kernel_session->consumer->dst.net.control; | |
128 | kdata_port = session->kernel_session->consumer->dst.net.data.port; | |
129 | } | |
130 | ||
131 | if (session->ust_session && session->ust_session->consumer) { | |
132 | uuri = &session->ust_session->consumer->dst.net.control; | |
133 | udata_port = session->ust_session->consumer->dst.net.data.port; | |
134 | } | |
135 | ||
136 | if (uuri == NULL && kuri == NULL) { | |
137 | uri = &session->consumer->dst.net.control; | |
138 | kdata_port = session->consumer->dst.net.data.port; | |
139 | } else if (kuri && uuri) { | |
140 | ret = uri_compare(kuri, uuri); | |
141 | if (ret) { | |
142 | /* Not Equal */ | |
143 | uri = kuri; | |
144 | /* Build uuri URL string */ | |
145 | ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl)); | |
146 | if (ret < 0) { | |
147 | goto error; | |
148 | } | |
149 | } else { | |
150 | uri = kuri; | |
151 | } | |
152 | } else if (kuri && uuri == NULL) { | |
153 | uri = kuri; | |
154 | } else if (uuri && kuri == NULL) { | |
155 | uri = uuri; | |
156 | } | |
157 | ||
158 | ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls)); | |
159 | if (ret < 0) { | |
160 | goto error; | |
161 | } | |
162 | ||
9aa9f900 DG |
163 | /* |
164 | * Do we have a UST url set. If yes, this means we have both kernel and UST | |
165 | * to print. | |
166 | */ | |
9d035200 | 167 | if (*tmp_uurl != '\0') { |
2f77fc4b DG |
168 | ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]", |
169 | tmp_urls, kdata_port, tmp_uurl, udata_port); | |
170 | } else { | |
9aa9f900 | 171 | int dport; |
bef08707 | 172 | if (kuri || (!kuri && !uuri)) { |
9aa9f900 DG |
173 | dport = kdata_port; |
174 | } else { | |
175 | /* No kernel URI, use the UST port. */ | |
176 | dport = udata_port; | |
177 | } | |
178 | ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport); | |
2f77fc4b DG |
179 | } |
180 | ||
181 | error: | |
182 | return ret; | |
183 | } | |
184 | ||
fb83fe64 JD |
185 | /* |
186 | * Get run-time attributes if the session has been started (discarded events, | |
187 | * lost packets). | |
188 | */ | |
189 | static int get_kernel_runtime_stats(struct ltt_session *session, | |
190 | struct ltt_kernel_channel *kchan, uint64_t *discarded_events, | |
191 | uint64_t *lost_packets) | |
192 | { | |
193 | int ret; | |
194 | ||
195 | if (!session->has_been_started) { | |
196 | ret = 0; | |
197 | *discarded_events = 0; | |
198 | *lost_packets = 0; | |
199 | goto end; | |
200 | } | |
201 | ||
e1f3997a | 202 | ret = consumer_get_discarded_events(session->id, kchan->key, |
fb83fe64 JD |
203 | session->kernel_session->consumer, |
204 | discarded_events); | |
205 | if (ret < 0) { | |
206 | goto end; | |
207 | } | |
208 | ||
e1f3997a | 209 | ret = consumer_get_lost_packets(session->id, kchan->key, |
fb83fe64 JD |
210 | session->kernel_session->consumer, |
211 | lost_packets); | |
212 | if (ret < 0) { | |
213 | goto end; | |
214 | } | |
215 | ||
216 | end: | |
217 | return ret; | |
218 | } | |
219 | ||
220 | /* | |
221 | * Get run-time attributes if the session has been started (discarded events, | |
222 | * lost packets). | |
223 | */ | |
224 | static int get_ust_runtime_stats(struct ltt_session *session, | |
225 | struct ltt_ust_channel *uchan, uint64_t *discarded_events, | |
226 | uint64_t *lost_packets) | |
227 | { | |
228 | int ret; | |
229 | struct ltt_ust_session *usess; | |
230 | ||
a91c5803 JG |
231 | if (!discarded_events || !lost_packets) { |
232 | ret = -1; | |
233 | goto end; | |
234 | } | |
235 | ||
fb83fe64 | 236 | usess = session->ust_session; |
a905c624 JG |
237 | assert(discarded_events); |
238 | assert(lost_packets); | |
fb83fe64 JD |
239 | |
240 | if (!usess || !session->has_been_started) { | |
241 | *discarded_events = 0; | |
242 | *lost_packets = 0; | |
243 | ret = 0; | |
244 | goto end; | |
245 | } | |
246 | ||
247 | if (usess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
248 | ret = ust_app_uid_get_channel_runtime_stats(usess->id, | |
249 | &usess->buffer_reg_uid_list, | |
250 | usess->consumer, uchan->id, | |
251 | uchan->attr.overwrite, | |
252 | discarded_events, | |
253 | lost_packets); | |
254 | } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
255 | ret = ust_app_pid_get_channel_runtime_stats(usess, | |
256 | uchan, usess->consumer, | |
257 | uchan->attr.overwrite, | |
258 | discarded_events, | |
259 | lost_packets); | |
260 | if (ret < 0) { | |
261 | goto end; | |
262 | } | |
263 | *discarded_events += uchan->per_pid_closed_app_discarded; | |
264 | *lost_packets += uchan->per_pid_closed_app_lost; | |
265 | } else { | |
266 | ERR("Unsupported buffer type"); | |
967bc289 | 267 | assert(0); |
fb83fe64 JD |
268 | ret = -1; |
269 | goto end; | |
270 | } | |
271 | ||
272 | end: | |
273 | return ret; | |
274 | } | |
275 | ||
2f77fc4b DG |
276 | /* |
277 | * Fill lttng_channel array of all channels. | |
278 | */ | |
d449df4a | 279 | static ssize_t list_lttng_channels(enum lttng_domain_type domain, |
fb83fe64 | 280 | struct ltt_session *session, struct lttng_channel *channels, |
cf0bcb51 | 281 | struct lttng_channel_extended *chan_exts) |
2f77fc4b | 282 | { |
d449df4a | 283 | int i = 0, ret = 0; |
2f77fc4b DG |
284 | struct ltt_kernel_channel *kchan; |
285 | ||
286 | DBG("Listing channels for session %s", session->name); | |
287 | ||
288 | switch (domain) { | |
289 | case LTTNG_DOMAIN_KERNEL: | |
290 | /* Kernel channels */ | |
291 | if (session->kernel_session != NULL) { | |
292 | cds_list_for_each_entry(kchan, | |
293 | &session->kernel_session->channel_list.head, list) { | |
fb83fe64 | 294 | uint64_t discarded_events, lost_packets; |
cf0bcb51 JG |
295 | struct lttng_channel_extended *extended; |
296 | ||
297 | extended = (struct lttng_channel_extended *) | |
298 | kchan->channel->attr.extended.ptr; | |
fb83fe64 JD |
299 | |
300 | ret = get_kernel_runtime_stats(session, kchan, | |
301 | &discarded_events, &lost_packets); | |
302 | if (ret < 0) { | |
303 | goto end; | |
304 | } | |
2f77fc4b DG |
305 | /* Copy lttng_channel struct to array */ |
306 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
307 | channels[i].enabled = kchan->enabled; | |
fb83fe64 JD |
308 | chan_exts[i].discarded_events = |
309 | discarded_events; | |
310 | chan_exts[i].lost_packets = lost_packets; | |
cf0bcb51 JG |
311 | chan_exts[i].monitor_timer_interval = |
312 | extended->monitor_timer_interval; | |
491d1539 | 313 | chan_exts[i].blocking_timeout = 0; |
2f77fc4b DG |
314 | i++; |
315 | } | |
316 | } | |
317 | break; | |
318 | case LTTNG_DOMAIN_UST: | |
319 | { | |
320 | struct lttng_ht_iter iter; | |
321 | struct ltt_ust_channel *uchan; | |
322 | ||
e7fe706f | 323 | rcu_read_lock(); |
2f77fc4b DG |
324 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
325 | &iter.iter, uchan, node.node) { | |
a91c5803 | 326 | uint64_t discarded_events = 0, lost_packets = 0; |
fb83fe64 | 327 | |
8ee609c8 MD |
328 | if (lttng_strncpy(channels[i].name, uchan->name, |
329 | LTTNG_SYMBOL_NAME_LEN)) { | |
330 | break; | |
331 | } | |
2f77fc4b DG |
332 | channels[i].attr.overwrite = uchan->attr.overwrite; |
333 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
334 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
335 | channels[i].attr.switch_timer_interval = | |
336 | uchan->attr.switch_timer_interval; | |
337 | channels[i].attr.read_timer_interval = | |
338 | uchan->attr.read_timer_interval; | |
339 | channels[i].enabled = uchan->enabled; | |
2f785fe7 DG |
340 | channels[i].attr.tracefile_size = uchan->tracefile_size; |
341 | channels[i].attr.tracefile_count = uchan->tracefile_count; | |
5e4435a4 JG |
342 | |
343 | /* | |
344 | * Map enum lttng_ust_output to enum lttng_event_output. | |
345 | */ | |
2f77fc4b DG |
346 | switch (uchan->attr.output) { |
347 | case LTTNG_UST_MMAP: | |
2f77fc4b DG |
348 | channels[i].attr.output = LTTNG_EVENT_MMAP; |
349 | break; | |
5e4435a4 JG |
350 | default: |
351 | /* | |
352 | * LTTNG_UST_MMAP is the only supported UST | |
353 | * output mode. | |
354 | */ | |
355 | assert(0); | |
356 | break; | |
2f77fc4b | 357 | } |
fb83fe64 | 358 | |
d449df4a MD |
359 | chan_exts[i].monitor_timer_interval = |
360 | uchan->monitor_timer_interval; | |
491d1539 MD |
361 | chan_exts[i].blocking_timeout = |
362 | uchan->attr.u.s.blocking_timeout; | |
d449df4a | 363 | |
fb83fe64 JD |
364 | ret = get_ust_runtime_stats(session, uchan, |
365 | &discarded_events, &lost_packets); | |
366 | if (ret < 0) { | |
367 | break; | |
368 | } | |
369 | chan_exts[i].discarded_events = discarded_events; | |
370 | chan_exts[i].lost_packets = lost_packets; | |
2f77fc4b DG |
371 | i++; |
372 | } | |
e7fe706f | 373 | rcu_read_unlock(); |
2f77fc4b DG |
374 | break; |
375 | } | |
376 | default: | |
377 | break; | |
378 | } | |
fb83fe64 JD |
379 | |
380 | end: | |
d449df4a MD |
381 | if (ret < 0) { |
382 | return -LTTNG_ERR_FATAL; | |
383 | } else { | |
384 | return LTTNG_OK; | |
385 | } | |
2f77fc4b DG |
386 | } |
387 | ||
3c02e545 FD |
388 | static int increment_extended_len(const char *filter_expression, |
389 | struct lttng_event_exclusion *exclusion, | |
390 | const struct lttng_userspace_probe_location *probe_location, | |
391 | size_t *extended_len) | |
b4e3ceb9 | 392 | { |
3c02e545 FD |
393 | int ret = 0; |
394 | ||
b4e3ceb9 PP |
395 | *extended_len += sizeof(struct lttcomm_event_extended_header); |
396 | ||
397 | if (filter_expression) { | |
398 | *extended_len += strlen(filter_expression) + 1; | |
399 | } | |
795d57ce PP |
400 | |
401 | if (exclusion) { | |
402 | *extended_len += exclusion->count * LTTNG_SYMBOL_NAME_LEN; | |
403 | } | |
3c02e545 FD |
404 | |
405 | if (probe_location) { | |
406 | ret = lttng_userspace_probe_location_serialize(probe_location, | |
407 | NULL, NULL); | |
408 | if (ret < 0) { | |
409 | goto end; | |
410 | } | |
411 | *extended_len += ret; | |
412 | } | |
413 | ret = 0; | |
414 | end: | |
415 | return ret; | |
b4e3ceb9 PP |
416 | } |
417 | ||
3c02e545 FD |
418 | static int append_extended_info(const char *filter_expression, |
419 | struct lttng_event_exclusion *exclusion, | |
420 | struct lttng_userspace_probe_location *probe_location, | |
421 | void **extended_at) | |
b4e3ceb9 | 422 | { |
3c02e545 | 423 | int ret = 0; |
b4e3ceb9 | 424 | size_t filter_len = 0; |
795d57ce | 425 | size_t nb_exclusions = 0; |
3c02e545 FD |
426 | size_t userspace_probe_location_len = 0; |
427 | struct lttng_dynamic_buffer location_buffer; | |
428 | struct lttcomm_event_extended_header extended_header; | |
b4e3ceb9 PP |
429 | |
430 | if (filter_expression) { | |
431 | filter_len = strlen(filter_expression) + 1; | |
432 | } | |
433 | ||
795d57ce PP |
434 | if (exclusion) { |
435 | nb_exclusions = exclusion->count; | |
436 | } | |
437 | ||
3c02e545 FD |
438 | if (probe_location) { |
439 | lttng_dynamic_buffer_init(&location_buffer); | |
440 | ret = lttng_userspace_probe_location_serialize(probe_location, | |
441 | &location_buffer, NULL); | |
442 | if (ret < 0) { | |
443 | ret = -1; | |
444 | goto end; | |
445 | } | |
446 | userspace_probe_location_len = location_buffer.size; | |
447 | } | |
448 | ||
795d57ce | 449 | /* Set header fields */ |
b4e3ceb9 | 450 | extended_header.filter_len = filter_len; |
795d57ce | 451 | extended_header.nb_exclusions = nb_exclusions; |
3c02e545 | 452 | extended_header.userspace_probe_location_len = userspace_probe_location_len; |
795d57ce PP |
453 | |
454 | /* Copy header */ | |
b4e3ceb9 PP |
455 | memcpy(*extended_at, &extended_header, sizeof(extended_header)); |
456 | *extended_at += sizeof(extended_header); | |
795d57ce PP |
457 | |
458 | /* Copy filter string */ | |
459 | if (filter_expression) { | |
460 | memcpy(*extended_at, filter_expression, filter_len); | |
461 | *extended_at += filter_len; | |
462 | } | |
463 | ||
464 | /* Copy exclusion names */ | |
465 | if (exclusion) { | |
466 | size_t len = nb_exclusions * LTTNG_SYMBOL_NAME_LEN; | |
467 | ||
468 | memcpy(*extended_at, &exclusion->names, len); | |
469 | *extended_at += len; | |
470 | } | |
3c02e545 FD |
471 | |
472 | if (probe_location) { | |
473 | memcpy(*extended_at, location_buffer.data, location_buffer.size); | |
474 | *extended_at += location_buffer.size; | |
475 | lttng_dynamic_buffer_reset(&location_buffer); | |
476 | } | |
477 | ret = 0; | |
478 | end: | |
479 | return ret; | |
b4e3ceb9 PP |
480 | } |
481 | ||
3c6a091f | 482 | /* |
022d91ba | 483 | * Create a list of agent domain events. |
3c6a091f DG |
484 | * |
485 | * Return number of events in list on success or else a negative value. | |
486 | */ | |
022d91ba | 487 | static int list_lttng_agent_events(struct agent *agt, |
b4e3ceb9 | 488 | struct lttng_event **events, size_t *total_size) |
3c6a091f DG |
489 | { |
490 | int i = 0, ret = 0; | |
491 | unsigned int nb_event = 0; | |
022d91ba | 492 | struct agent_event *event; |
47e52862 | 493 | struct lttng_event *tmp_events = NULL; |
3c6a091f | 494 | struct lttng_ht_iter iter; |
b4e3ceb9 PP |
495 | size_t extended_len = 0; |
496 | void *extended_at; | |
3c6a091f | 497 | |
022d91ba | 498 | assert(agt); |
3c6a091f DG |
499 | assert(events); |
500 | ||
022d91ba | 501 | DBG3("Listing agent events"); |
3c6a091f | 502 | |
e5bbf678 | 503 | rcu_read_lock(); |
022d91ba | 504 | nb_event = lttng_ht_get_count(agt->events); |
e5bbf678 | 505 | rcu_read_unlock(); |
3c6a091f DG |
506 | if (nb_event == 0) { |
507 | ret = nb_event; | |
b4e3ceb9 | 508 | *total_size = 0; |
3c6a091f DG |
509 | goto error; |
510 | } | |
511 | ||
b4e3ceb9 PP |
512 | /* Compute required extended infos size */ |
513 | extended_len = nb_event * sizeof(struct lttcomm_event_extended_header); | |
514 | ||
515 | /* | |
516 | * This is only valid because the commands which add events are | |
517 | * processed in the same thread as the listing. | |
518 | */ | |
519 | rcu_read_lock(); | |
520 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { | |
3c02e545 | 521 | ret = increment_extended_len(event->filter_expression, NULL, NULL, |
795d57ce | 522 | &extended_len); |
3c02e545 FD |
523 | if (ret) { |
524 | DBG("Error computing the length of extended info message"); | |
525 | ret = -LTTNG_ERR_FATAL; | |
526 | goto error; | |
527 | } | |
b4e3ceb9 PP |
528 | } |
529 | rcu_read_unlock(); | |
530 | ||
531 | *total_size = nb_event * sizeof(*tmp_events) + extended_len; | |
532 | tmp_events = zmalloc(*total_size); | |
3c6a091f | 533 | if (!tmp_events) { |
022d91ba | 534 | PERROR("zmalloc agent events session"); |
3c6a091f DG |
535 | ret = -LTTNG_ERR_FATAL; |
536 | goto error; | |
537 | } | |
538 | ||
b4e3ceb9 PP |
539 | extended_at = ((uint8_t *) tmp_events) + |
540 | nb_event * sizeof(struct lttng_event); | |
541 | ||
3c6a091f | 542 | rcu_read_lock(); |
022d91ba | 543 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
3c6a091f DG |
544 | strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name)); |
545 | tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0'; | |
546 | tmp_events[i].enabled = event->enabled; | |
2106efa0 | 547 | tmp_events[i].loglevel = event->loglevel_value; |
ff94328f | 548 | tmp_events[i].loglevel_type = event->loglevel_type; |
3c6a091f | 549 | i++; |
b4e3ceb9 PP |
550 | |
551 | /* Append extended info */ | |
3c02e545 | 552 | ret = append_extended_info(event->filter_expression, NULL, NULL, |
795d57ce | 553 | &extended_at); |
3c02e545 FD |
554 | if (ret) { |
555 | DBG("Error appending extended info message"); | |
556 | ret = -LTTNG_ERR_FATAL; | |
557 | goto error; | |
558 | } | |
3c6a091f | 559 | } |
3c6a091f DG |
560 | |
561 | *events = tmp_events; | |
562 | ret = nb_event; | |
3c02e545 | 563 | assert(nb_event == i); |
3c6a091f | 564 | |
47e52862 | 565 | end: |
3c02e545 | 566 | rcu_read_unlock(); |
3c6a091f | 567 | return ret; |
47e52862 JG |
568 | error: |
569 | free(tmp_events); | |
570 | goto end; | |
3c6a091f DG |
571 | } |
572 | ||
2f77fc4b DG |
573 | /* |
574 | * Create a list of ust global domain events. | |
575 | */ | |
576 | static int list_lttng_ust_global_events(char *channel_name, | |
b4e3ceb9 PP |
577 | struct ltt_ust_domain_global *ust_global, |
578 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
579 | { |
580 | int i = 0, ret = 0; | |
581 | unsigned int nb_event = 0; | |
582 | struct lttng_ht_iter iter; | |
583 | struct lttng_ht_node_str *node; | |
584 | struct ltt_ust_channel *uchan; | |
585 | struct ltt_ust_event *uevent; | |
586 | struct lttng_event *tmp; | |
b4e3ceb9 PP |
587 | size_t extended_len = 0; |
588 | void *extended_at; | |
2f77fc4b DG |
589 | |
590 | DBG("Listing UST global events for channel %s", channel_name); | |
591 | ||
592 | rcu_read_lock(); | |
593 | ||
594 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); | |
595 | node = lttng_ht_iter_get_node_str(&iter); | |
596 | if (node == NULL) { | |
f73fabfd | 597 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
d31d3e8c | 598 | goto end; |
2f77fc4b DG |
599 | } |
600 | ||
601 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); | |
602 | ||
3c442be3 | 603 | nb_event = lttng_ht_get_count(uchan->events); |
2f77fc4b DG |
604 | if (nb_event == 0) { |
605 | ret = nb_event; | |
b4e3ceb9 | 606 | *total_size = 0; |
d31d3e8c | 607 | goto end; |
2f77fc4b DG |
608 | } |
609 | ||
610 | DBG3("Listing UST global %d events", nb_event); | |
611 | ||
b4e3ceb9 PP |
612 | /* Compute required extended infos size */ |
613 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { | |
614 | if (uevent->internal) { | |
615 | nb_event--; | |
616 | continue; | |
617 | } | |
618 | ||
3c02e545 FD |
619 | ret = increment_extended_len(uevent->filter_expression, |
620 | uevent->exclusion, NULL, &extended_len); | |
621 | if (ret) { | |
622 | DBG("Error computing the length of extended info message"); | |
623 | ret = -LTTNG_ERR_FATAL; | |
624 | goto end; | |
625 | } | |
b4e3ceb9 | 626 | } |
d31d3e8c PP |
627 | if (nb_event == 0) { |
628 | /* All events are internal, skip. */ | |
629 | ret = 0; | |
630 | *total_size = 0; | |
631 | goto end; | |
632 | } | |
b4e3ceb9 PP |
633 | |
634 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
635 | tmp = zmalloc(*total_size); | |
2f77fc4b | 636 | if (tmp == NULL) { |
b12c38df JG |
637 | ret = -LTTNG_ERR_FATAL; |
638 | goto end; | |
2f77fc4b DG |
639 | } |
640 | ||
b4e3ceb9 PP |
641 | extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event); |
642 | ||
2f77fc4b | 643 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
3c442be3 JG |
644 | if (uevent->internal) { |
645 | /* This event should remain hidden from clients */ | |
3c442be3 JG |
646 | continue; |
647 | } | |
2f77fc4b DG |
648 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
649 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
650 | tmp[i].enabled = uevent->enabled; | |
651 | ||
652 | switch (uevent->attr.instrumentation) { | |
653 | case LTTNG_UST_TRACEPOINT: | |
654 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
655 | break; | |
656 | case LTTNG_UST_PROBE: | |
657 | tmp[i].type = LTTNG_EVENT_PROBE; | |
658 | break; | |
659 | case LTTNG_UST_FUNCTION: | |
660 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
661 | break; | |
662 | } | |
663 | ||
664 | tmp[i].loglevel = uevent->attr.loglevel; | |
665 | switch (uevent->attr.loglevel_type) { | |
666 | case LTTNG_UST_LOGLEVEL_ALL: | |
667 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
668 | break; | |
669 | case LTTNG_UST_LOGLEVEL_RANGE: | |
670 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; | |
671 | break; | |
672 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
673 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; | |
674 | break; | |
675 | } | |
676 | if (uevent->filter) { | |
677 | tmp[i].filter = 1; | |
678 | } | |
4634f12e JI |
679 | if (uevent->exclusion) { |
680 | tmp[i].exclusion = 1; | |
681 | } | |
2f77fc4b | 682 | i++; |
b4e3ceb9 PP |
683 | |
684 | /* Append extended info */ | |
3c02e545 FD |
685 | ret = append_extended_info(uevent->filter_expression, |
686 | uevent->exclusion, NULL, &extended_at); | |
687 | if (ret) { | |
688 | DBG("Error appending extended info message"); | |
689 | ret = -LTTNG_ERR_FATAL; | |
690 | goto end; | |
691 | } | |
2f77fc4b DG |
692 | } |
693 | ||
694 | ret = nb_event; | |
695 | *events = tmp; | |
d31d3e8c | 696 | end: |
2f77fc4b DG |
697 | rcu_read_unlock(); |
698 | return ret; | |
699 | } | |
700 | ||
701 | /* | |
702 | * Fill lttng_event array of all kernel events in the channel. | |
703 | */ | |
704 | static int list_lttng_kernel_events(char *channel_name, | |
b4e3ceb9 PP |
705 | struct ltt_kernel_session *kernel_session, |
706 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
707 | { |
708 | int i = 0, ret; | |
709 | unsigned int nb_event; | |
710 | struct ltt_kernel_event *event; | |
711 | struct ltt_kernel_channel *kchan; | |
b4e3ceb9 PP |
712 | size_t extended_len = 0; |
713 | void *extended_at; | |
2f77fc4b DG |
714 | |
715 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
716 | if (kchan == NULL) { | |
f73fabfd | 717 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
718 | goto error; |
719 | } | |
720 | ||
721 | nb_event = kchan->event_count; | |
722 | ||
723 | DBG("Listing events for channel %s", kchan->channel->name); | |
724 | ||
725 | if (nb_event == 0) { | |
b4e3ceb9 | 726 | *total_size = 0; |
834978fd | 727 | *events = NULL; |
db906c12 | 728 | goto end; |
2f77fc4b DG |
729 | } |
730 | ||
b4e3ceb9 PP |
731 | /* Compute required extended infos size */ |
732 | cds_list_for_each_entry(event, &kchan->events_list.head, list) { | |
3c02e545 FD |
733 | ret = increment_extended_len(event->filter_expression, NULL, |
734 | event->userspace_probe_location, | |
795d57ce | 735 | &extended_len); |
3c02e545 FD |
736 | if (ret) { |
737 | DBG("Error computing the length of extended info message"); | |
738 | ret = -LTTNG_ERR_FATAL; | |
739 | goto error; | |
740 | } | |
b4e3ceb9 PP |
741 | } |
742 | ||
743 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
744 | *events = zmalloc(*total_size); | |
2f77fc4b | 745 | if (*events == NULL) { |
3c02e545 | 746 | ret = -LTTNG_ERR_FATAL; |
2f77fc4b DG |
747 | goto error; |
748 | } | |
749 | ||
ab4aa612 | 750 | extended_at = ((void *) *events) + |
b4e3ceb9 PP |
751 | nb_event * sizeof(struct lttng_event); |
752 | ||
2f77fc4b DG |
753 | /* Kernel channels */ |
754 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
755 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
756 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
757 | (*events)[i].enabled = event->enabled; | |
00f992f2 JG |
758 | (*events)[i].filter = |
759 | (unsigned char) !!event->filter_expression; | |
2f77fc4b DG |
760 | |
761 | switch (event->event->instrumentation) { | |
762 | case LTTNG_KERNEL_TRACEPOINT: | |
763 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; | |
764 | break; | |
2f77fc4b | 765 | case LTTNG_KERNEL_KRETPROBE: |
1896972b DG |
766 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
767 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
768 | sizeof(struct lttng_kernel_kprobe)); | |
769 | break; | |
770 | case LTTNG_KERNEL_KPROBE: | |
2f77fc4b DG |
771 | (*events)[i].type = LTTNG_EVENT_PROBE; |
772 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
773 | sizeof(struct lttng_kernel_kprobe)); | |
774 | break; | |
b955b4d4 FD |
775 | case LTTNG_KERNEL_UPROBE: |
776 | (*events)[i].type = LTTNG_EVENT_USERSPACE_PROBE; | |
777 | break; | |
2f77fc4b DG |
778 | case LTTNG_KERNEL_FUNCTION: |
779 | (*events)[i].type = LTTNG_EVENT_FUNCTION; | |
780 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
781 | sizeof(struct lttng_kernel_function)); | |
782 | break; | |
783 | case LTTNG_KERNEL_NOOP: | |
784 | (*events)[i].type = LTTNG_EVENT_NOOP; | |
785 | break; | |
786 | case LTTNG_KERNEL_SYSCALL: | |
787 | (*events)[i].type = LTTNG_EVENT_SYSCALL; | |
788 | break; | |
789 | case LTTNG_KERNEL_ALL: | |
1ab8c2ad FD |
790 | /* fall-through. */ |
791 | default: | |
2f77fc4b DG |
792 | assert(0); |
793 | break; | |
794 | } | |
795 | i++; | |
b4e3ceb9 PP |
796 | |
797 | /* Append extended info */ | |
3c02e545 FD |
798 | ret = append_extended_info(event->filter_expression, NULL, |
799 | event->userspace_probe_location, &extended_at); | |
800 | if (ret) { | |
801 | DBG("Error appending extended info message"); | |
802 | ret = -LTTNG_ERR_FATAL; | |
803 | goto error; | |
804 | } | |
2f77fc4b DG |
805 | } |
806 | ||
db906c12 | 807 | end: |
2f77fc4b DG |
808 | return nb_event; |
809 | ||
810 | error: | |
f73fabfd DG |
811 | /* Negate the error code to differentiate the size from an error */ |
812 | return -ret; | |
2f77fc4b DG |
813 | } |
814 | ||
815 | /* | |
816 | * Add URI so the consumer output object. Set the correct path depending on the | |
817 | * domain adding the default trace directory. | |
818 | */ | |
819 | static int add_uri_to_consumer(struct consumer_output *consumer, | |
56a37563 JG |
820 | struct lttng_uri *uri, enum lttng_domain_type domain, |
821 | const char *session_name) | |
2f77fc4b | 822 | { |
f73fabfd | 823 | int ret = LTTNG_OK; |
2f77fc4b DG |
824 | const char *default_trace_dir; |
825 | ||
826 | assert(uri); | |
827 | ||
828 | if (consumer == NULL) { | |
829 | DBG("No consumer detected. Don't add URI. Stopping."); | |
f73fabfd | 830 | ret = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
831 | goto error; |
832 | } | |
833 | ||
834 | switch (domain) { | |
835 | case LTTNG_DOMAIN_KERNEL: | |
836 | default_trace_dir = DEFAULT_KERNEL_TRACE_DIR; | |
837 | break; | |
838 | case LTTNG_DOMAIN_UST: | |
839 | default_trace_dir = DEFAULT_UST_TRACE_DIR; | |
840 | break; | |
841 | default: | |
842 | /* | |
843 | * This case is possible is we try to add the URI to the global tracing | |
844 | * session consumer object which in this case there is no subdir. | |
845 | */ | |
846 | default_trace_dir = ""; | |
847 | } | |
848 | ||
849 | switch (uri->dtype) { | |
850 | case LTTNG_DST_IPV4: | |
851 | case LTTNG_DST_IPV6: | |
852 | DBG2("Setting network URI to consumer"); | |
853 | ||
df75acac DG |
854 | if (consumer->type == CONSUMER_DST_NET) { |
855 | if ((uri->stype == LTTNG_STREAM_CONTROL && | |
785d2d0d DG |
856 | consumer->dst.net.control_isset) || |
857 | (uri->stype == LTTNG_STREAM_DATA && | |
858 | consumer->dst.net.data_isset)) { | |
df75acac DG |
859 | ret = LTTNG_ERR_URL_EXIST; |
860 | goto error; | |
861 | } | |
862 | } else { | |
863 | memset(&consumer->dst.net, 0, sizeof(consumer->dst.net)); | |
785d2d0d DG |
864 | } |
865 | ||
df75acac DG |
866 | consumer->type = CONSUMER_DST_NET; |
867 | ||
2f77fc4b DG |
868 | /* Set URI into consumer output object */ |
869 | ret = consumer_set_network_uri(consumer, uri); | |
870 | if (ret < 0) { | |
a74934ba | 871 | ret = -ret; |
2f77fc4b DG |
872 | goto error; |
873 | } else if (ret == 1) { | |
874 | /* | |
875 | * URI was the same in the consumer so we do not append the subdir | |
876 | * again so to not duplicate output dir. | |
877 | */ | |
f86c9f4e | 878 | ret = LTTNG_OK; |
2f77fc4b DG |
879 | goto error; |
880 | } | |
881 | ||
882 | if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) { | |
883 | ret = consumer_set_subdir(consumer, session_name); | |
884 | if (ret < 0) { | |
f73fabfd | 885 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
886 | goto error; |
887 | } | |
888 | } | |
889 | ||
890 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
891 | /* On a new subdir, reappend the default trace dir. */ | |
c30ce0b3 CB |
892 | strncat(consumer->subdir, default_trace_dir, |
893 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
894 | DBG3("Append domain trace name to subdir %s", consumer->subdir); |
895 | } | |
896 | ||
897 | break; | |
898 | case LTTNG_DST_PATH: | |
899 | DBG2("Setting trace directory path from URI to %s", uri->dst.path); | |
366a9222 JD |
900 | memset(consumer->dst.session_root_path, 0, |
901 | sizeof(consumer->dst.session_root_path)); | |
9ac05d92 MD |
902 | /* Explicit length checks for strcpy and strcat. */ |
903 | if (strlen(uri->dst.path) + strlen(default_trace_dir) | |
366a9222 | 904 | >= sizeof(consumer->dst.session_root_path)) { |
9ac05d92 MD |
905 | ret = LTTNG_ERR_FATAL; |
906 | goto error; | |
907 | } | |
366a9222 | 908 | strcpy(consumer->dst.session_root_path, uri->dst.path); |
2f77fc4b | 909 | /* Append default trace dir */ |
366a9222 | 910 | strcat(consumer->dst.session_root_path, default_trace_dir); |
2f77fc4b DG |
911 | /* Flag consumer as local. */ |
912 | consumer->type = CONSUMER_DST_LOCAL; | |
913 | break; | |
914 | } | |
915 | ||
a74934ba DG |
916 | ret = LTTNG_OK; |
917 | ||
2f77fc4b DG |
918 | error: |
919 | return ret; | |
920 | } | |
921 | ||
922 | /* | |
923 | * Init tracing by creating trace directory and sending fds kernel consumer. | |
924 | */ | |
925 | static int init_kernel_tracing(struct ltt_kernel_session *session) | |
926 | { | |
927 | int ret = 0; | |
928 | struct lttng_ht_iter iter; | |
929 | struct consumer_socket *socket; | |
930 | ||
931 | assert(session); | |
932 | ||
e7fe706f DG |
933 | rcu_read_lock(); |
934 | ||
2f77fc4b DG |
935 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { |
936 | cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter, | |
937 | socket, node.node) { | |
2f77fc4b | 938 | pthread_mutex_lock(socket->lock); |
f50f23d9 | 939 | ret = kernel_consumer_send_session(socket, session); |
2f77fc4b DG |
940 | pthread_mutex_unlock(socket->lock); |
941 | if (ret < 0) { | |
f73fabfd | 942 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
943 | goto error; |
944 | } | |
945 | } | |
946 | } | |
947 | ||
948 | error: | |
e7fe706f | 949 | rcu_read_unlock(); |
2f77fc4b DG |
950 | return ret; |
951 | } | |
952 | ||
953 | /* | |
954 | * Create a socket to the relayd using the URI. | |
955 | * | |
956 | * On success, the relayd_sock pointer is set to the created socket. | |
957 | * Else, it's stays untouched and a lttcomm error code is returned. | |
958 | */ | |
6151a90f | 959 | static int create_connect_relayd(struct lttng_uri *uri, |
b31610f2 JD |
960 | struct lttcomm_relayd_sock **relayd_sock, |
961 | struct consumer_output *consumer) | |
2f77fc4b DG |
962 | { |
963 | int ret; | |
6151a90f | 964 | struct lttcomm_relayd_sock *rsock; |
2f77fc4b | 965 | |
6151a90f JD |
966 | rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR, |
967 | RELAYD_VERSION_COMM_MINOR); | |
968 | if (!rsock) { | |
f73fabfd | 969 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
970 | goto error; |
971 | } | |
972 | ||
ffe60014 DG |
973 | /* |
974 | * Connect to relayd so we can proceed with a session creation. This call | |
975 | * can possibly block for an arbitrary amount of time to set the health | |
976 | * state to be in poll execution. | |
977 | */ | |
978 | health_poll_entry(); | |
6151a90f | 979 | ret = relayd_connect(rsock); |
ffe60014 | 980 | health_poll_exit(); |
2f77fc4b DG |
981 | if (ret < 0) { |
982 | ERR("Unable to reach lttng-relayd"); | |
f73fabfd | 983 | ret = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
984 | goto free_sock; |
985 | } | |
986 | ||
987 | /* Create socket for control stream. */ | |
988 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
989 | DBG3("Creating relayd stream socket from URI"); | |
990 | ||
991 | /* Check relayd version */ | |
6151a90f | 992 | ret = relayd_version_check(rsock); |
67d5aa28 JD |
993 | if (ret == LTTNG_ERR_RELAYD_VERSION_FAIL) { |
994 | goto close_sock; | |
995 | } else if (ret < 0) { | |
996 | ERR("Unable to reach lttng-relayd"); | |
997 | ret = LTTNG_ERR_RELAYD_CONNECT_FAIL; | |
2f77fc4b DG |
998 | goto close_sock; |
999 | } | |
b31610f2 JD |
1000 | consumer->relay_major_version = rsock->major; |
1001 | consumer->relay_minor_version = rsock->minor; | |
2f77fc4b DG |
1002 | } else if (uri->stype == LTTNG_STREAM_DATA) { |
1003 | DBG3("Creating relayd data socket from URI"); | |
1004 | } else { | |
1005 | /* Command is not valid */ | |
1006 | ERR("Relayd invalid stream type: %d", uri->stype); | |
f73fabfd | 1007 | ret = LTTNG_ERR_INVALID; |
2f77fc4b DG |
1008 | goto close_sock; |
1009 | } | |
1010 | ||
6151a90f | 1011 | *relayd_sock = rsock; |
2f77fc4b | 1012 | |
f73fabfd | 1013 | return LTTNG_OK; |
2f77fc4b DG |
1014 | |
1015 | close_sock: | |
6151a90f JD |
1016 | /* The returned value is not useful since we are on an error path. */ |
1017 | (void) relayd_close(rsock); | |
2f77fc4b | 1018 | free_sock: |
6151a90f | 1019 | free(rsock); |
2f77fc4b DG |
1020 | error: |
1021 | return ret; | |
1022 | } | |
1023 | ||
1024 | /* | |
1025 | * Connect to the relayd using URI and send the socket to the right consumer. | |
43fade62 JG |
1026 | * |
1027 | * The consumer socket lock must be held by the caller. | |
2f77fc4b | 1028 | */ |
3044f922 JR |
1029 | static int send_consumer_relayd_socket(unsigned int session_id, |
1030 | struct lttng_uri *relayd_uri, | |
56a37563 | 1031 | struct consumer_output *consumer, |
d3e2ba59 JD |
1032 | struct consumer_socket *consumer_sock, |
1033 | char *session_name, char *hostname, int session_live_timer) | |
2f77fc4b DG |
1034 | { |
1035 | int ret; | |
6151a90f | 1036 | struct lttcomm_relayd_sock *rsock = NULL; |
2f77fc4b | 1037 | |
ffe60014 | 1038 | /* Connect to relayd and make version check if uri is the control. */ |
b31610f2 | 1039 | ret = create_connect_relayd(relayd_uri, &rsock, consumer); |
ffe60014 | 1040 | if (ret != LTTNG_OK) { |
9e218353 | 1041 | goto relayd_comm_error; |
ffe60014 | 1042 | } |
6151a90f | 1043 | assert(rsock); |
ffe60014 | 1044 | |
2f77fc4b | 1045 | /* Set the network sequence index if not set. */ |
d88aee68 DG |
1046 | if (consumer->net_seq_index == (uint64_t) -1ULL) { |
1047 | pthread_mutex_lock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
1048 | /* |
1049 | * Increment net_seq_idx because we are about to transfer the | |
1050 | * new relayd socket to the consumer. | |
d88aee68 | 1051 | * Assign unique key so the consumer can match streams. |
2f77fc4b | 1052 | */ |
d88aee68 DG |
1053 | consumer->net_seq_index = ++relayd_net_seq_idx; |
1054 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
1055 | } |
1056 | ||
2f77fc4b | 1057 | /* Send relayd socket to consumer. */ |
6151a90f | 1058 | ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer, |
d3e2ba59 JD |
1059 | relayd_uri->stype, session_id, |
1060 | session_name, hostname, session_live_timer); | |
2f77fc4b | 1061 | if (ret < 0) { |
f73fabfd | 1062 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
1063 | goto close_sock; |
1064 | } | |
1065 | ||
c890b720 DG |
1066 | /* Flag that the corresponding socket was sent. */ |
1067 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
ffe60014 | 1068 | consumer_sock->control_sock_sent = 1; |
c890b720 | 1069 | } else if (relayd_uri->stype == LTTNG_STREAM_DATA) { |
ffe60014 | 1070 | consumer_sock->data_sock_sent = 1; |
c890b720 DG |
1071 | } |
1072 | ||
f73fabfd | 1073 | ret = LTTNG_OK; |
2f77fc4b DG |
1074 | |
1075 | /* | |
1076 | * Close socket which was dup on the consumer side. The session daemon does | |
1077 | * NOT keep track of the relayd socket(s) once transfer to the consumer. | |
1078 | */ | |
1079 | ||
1080 | close_sock: | |
ffe60014 DG |
1081 | if (ret != LTTNG_OK) { |
1082 | /* | |
d9078d0c DG |
1083 | * The consumer output for this session should not be used anymore |
1084 | * since the relayd connection failed thus making any tracing or/and | |
1085 | * streaming not usable. | |
ffe60014 | 1086 | */ |
d9078d0c | 1087 | consumer->enabled = 0; |
ffe60014 | 1088 | } |
9e218353 JR |
1089 | (void) relayd_close(rsock); |
1090 | free(rsock); | |
1091 | ||
1092 | relayd_comm_error: | |
2f77fc4b DG |
1093 | return ret; |
1094 | } | |
1095 | ||
1096 | /* | |
1097 | * Send both relayd sockets to a specific consumer and domain. This is a | |
1098 | * helper function to facilitate sending the information to the consumer for a | |
1099 | * session. | |
43fade62 JG |
1100 | * |
1101 | * The consumer socket lock must be held by the caller. | |
2f77fc4b | 1102 | */ |
56a37563 JG |
1103 | static int send_consumer_relayd_sockets(enum lttng_domain_type domain, |
1104 | unsigned int session_id, struct consumer_output *consumer, | |
1105 | struct consumer_socket *sock, char *session_name, | |
1106 | char *hostname, int session_live_timer) | |
2f77fc4b | 1107 | { |
dda67f6c | 1108 | int ret = LTTNG_OK; |
2f77fc4b | 1109 | |
2f77fc4b | 1110 | assert(consumer); |
6dc3064a | 1111 | assert(sock); |
2f77fc4b | 1112 | |
2f77fc4b | 1113 | /* Sending control relayd socket. */ |
ffe60014 | 1114 | if (!sock->control_sock_sent) { |
3044f922 | 1115 | ret = send_consumer_relayd_socket(session_id, |
d3e2ba59 JD |
1116 | &consumer->dst.net.control, consumer, sock, |
1117 | session_name, hostname, session_live_timer); | |
c890b720 DG |
1118 | if (ret != LTTNG_OK) { |
1119 | goto error; | |
1120 | } | |
2f77fc4b DG |
1121 | } |
1122 | ||
1123 | /* Sending data relayd socket. */ | |
ffe60014 | 1124 | if (!sock->data_sock_sent) { |
3044f922 | 1125 | ret = send_consumer_relayd_socket(session_id, |
d3e2ba59 JD |
1126 | &consumer->dst.net.data, consumer, sock, |
1127 | session_name, hostname, session_live_timer); | |
c890b720 DG |
1128 | if (ret != LTTNG_OK) { |
1129 | goto error; | |
1130 | } | |
2f77fc4b DG |
1131 | } |
1132 | ||
2f77fc4b DG |
1133 | error: |
1134 | return ret; | |
1135 | } | |
1136 | ||
1137 | /* | |
1138 | * Setup relayd connections for a tracing session. First creates the socket to | |
1139 | * the relayd and send them to the right domain consumer. Consumer type MUST be | |
1140 | * network. | |
1141 | */ | |
ffe60014 | 1142 | int cmd_setup_relayd(struct ltt_session *session) |
2f77fc4b | 1143 | { |
f73fabfd | 1144 | int ret = LTTNG_OK; |
2f77fc4b DG |
1145 | struct ltt_ust_session *usess; |
1146 | struct ltt_kernel_session *ksess; | |
1147 | struct consumer_socket *socket; | |
1148 | struct lttng_ht_iter iter; | |
1149 | ||
1150 | assert(session); | |
1151 | ||
1152 | usess = session->ust_session; | |
1153 | ksess = session->kernel_session; | |
1154 | ||
785d2d0d | 1155 | DBG("Setting relayd for session %s", session->name); |
2f77fc4b | 1156 | |
e7fe706f DG |
1157 | rcu_read_lock(); |
1158 | ||
2f77fc4b DG |
1159 | if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET |
1160 | && usess->consumer->enabled) { | |
1161 | /* For each consumer socket, send relayd sockets */ | |
1162 | cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, | |
1163 | socket, node.node) { | |
2f77fc4b | 1164 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1165 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id, |
d3e2ba59 JD |
1166 | usess->consumer, socket, |
1167 | session->name, session->hostname, | |
1168 | session->live_timer); | |
2f77fc4b | 1169 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1170 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1171 | goto error; |
1172 | } | |
6dc3064a DG |
1173 | /* Session is now ready for network streaming. */ |
1174 | session->net_handle = 1; | |
2f77fc4b | 1175 | } |
b31610f2 JD |
1176 | session->consumer->relay_major_version = |
1177 | usess->consumer->relay_major_version; | |
1178 | session->consumer->relay_minor_version = | |
1179 | usess->consumer->relay_minor_version; | |
2f77fc4b DG |
1180 | } |
1181 | ||
1182 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET | |
1183 | && ksess->consumer->enabled) { | |
1184 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1185 | socket, node.node) { | |
2f77fc4b | 1186 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1187 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id, |
d3e2ba59 JD |
1188 | ksess->consumer, socket, |
1189 | session->name, session->hostname, | |
1190 | session->live_timer); | |
2f77fc4b | 1191 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1192 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1193 | goto error; |
1194 | } | |
6dc3064a DG |
1195 | /* Session is now ready for network streaming. */ |
1196 | session->net_handle = 1; | |
2f77fc4b | 1197 | } |
b31610f2 JD |
1198 | session->consumer->relay_major_version = |
1199 | ksess->consumer->relay_major_version; | |
1200 | session->consumer->relay_minor_version = | |
1201 | ksess->consumer->relay_minor_version; | |
2f77fc4b DG |
1202 | } |
1203 | ||
1204 | error: | |
e7fe706f | 1205 | rcu_read_unlock(); |
2f77fc4b DG |
1206 | return ret; |
1207 | } | |
1208 | ||
9b6c7ec5 DG |
1209 | /* |
1210 | * Start a kernel session by opening all necessary streams. | |
1211 | */ | |
1212 | static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe) | |
1213 | { | |
1214 | int ret; | |
1215 | struct ltt_kernel_channel *kchan; | |
1216 | ||
1217 | /* Open kernel metadata */ | |
07b86b52 | 1218 | if (ksess->metadata == NULL && ksess->output_traces) { |
9b6c7ec5 DG |
1219 | ret = kernel_open_metadata(ksess); |
1220 | if (ret < 0) { | |
1221 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1222 | goto error; | |
1223 | } | |
1224 | } | |
1225 | ||
1226 | /* Open kernel metadata stream */ | |
07b86b52 | 1227 | if (ksess->metadata && ksess->metadata_stream_fd < 0) { |
9b6c7ec5 DG |
1228 | ret = kernel_open_metadata_stream(ksess); |
1229 | if (ret < 0) { | |
1230 | ERR("Kernel create metadata stream failed"); | |
1231 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1232 | goto error; | |
1233 | } | |
1234 | } | |
1235 | ||
1236 | /* For each channel */ | |
1237 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
1238 | if (kchan->stream_count == 0) { | |
1239 | ret = kernel_open_channel_stream(kchan); | |
1240 | if (ret < 0) { | |
1241 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1242 | goto error; | |
1243 | } | |
1244 | /* Update the stream global counter */ | |
1245 | ksess->stream_count_global += ret; | |
1246 | } | |
1247 | } | |
1248 | ||
1249 | /* Setup kernel consumer socket and send fds to it */ | |
1250 | ret = init_kernel_tracing(ksess); | |
e43c41c5 | 1251 | if (ret != 0) { |
9b6c7ec5 DG |
1252 | ret = LTTNG_ERR_KERN_START_FAIL; |
1253 | goto error; | |
1254 | } | |
1255 | ||
1256 | /* This start the kernel tracing */ | |
1257 | ret = kernel_start_session(ksess); | |
1258 | if (ret < 0) { | |
1259 | ret = LTTNG_ERR_KERN_START_FAIL; | |
1260 | goto error; | |
1261 | } | |
1262 | ||
1263 | /* Quiescent wait after starting trace */ | |
462ae7ae | 1264 | kernel_wait_quiescent(wpipe); |
9b6c7ec5 | 1265 | |
14fb1ebe | 1266 | ksess->active = 1; |
9b6c7ec5 DG |
1267 | |
1268 | ret = LTTNG_OK; | |
1269 | ||
1270 | error: | |
1271 | return ret; | |
1272 | } | |
1273 | ||
2f77fc4b DG |
1274 | /* |
1275 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. | |
1276 | */ | |
56a37563 JG |
1277 | int cmd_disable_channel(struct ltt_session *session, |
1278 | enum lttng_domain_type domain, char *channel_name) | |
2f77fc4b DG |
1279 | { |
1280 | int ret; | |
1281 | struct ltt_ust_session *usess; | |
1282 | ||
1283 | usess = session->ust_session; | |
1284 | ||
2223c96f DG |
1285 | rcu_read_lock(); |
1286 | ||
2f77fc4b DG |
1287 | switch (domain) { |
1288 | case LTTNG_DOMAIN_KERNEL: | |
1289 | { | |
1290 | ret = channel_kernel_disable(session->kernel_session, | |
1291 | channel_name); | |
f73fabfd | 1292 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1293 | goto error; |
1294 | } | |
1295 | ||
1296 | kernel_wait_quiescent(kernel_tracer_fd); | |
1297 | break; | |
1298 | } | |
1299 | case LTTNG_DOMAIN_UST: | |
1300 | { | |
1301 | struct ltt_ust_channel *uchan; | |
1302 | struct lttng_ht *chan_ht; | |
1303 | ||
1304 | chan_ht = usess->domain_global.channels; | |
1305 | ||
1306 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
1307 | if (uchan == NULL) { | |
f73fabfd | 1308 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
1309 | goto error; |
1310 | } | |
1311 | ||
7972aab2 | 1312 | ret = channel_ust_disable(usess, uchan); |
f73fabfd | 1313 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1314 | goto error; |
1315 | } | |
1316 | break; | |
1317 | } | |
2f77fc4b | 1318 | default: |
f73fabfd | 1319 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1320 | goto error; |
1321 | } | |
1322 | ||
f73fabfd | 1323 | ret = LTTNG_OK; |
2f77fc4b DG |
1324 | |
1325 | error: | |
2223c96f | 1326 | rcu_read_unlock(); |
2f77fc4b DG |
1327 | return ret; |
1328 | } | |
1329 | ||
ccf10263 MD |
1330 | /* |
1331 | * Command LTTNG_TRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1332 | * |
1333 | * Called with session lock held. | |
ccf10263 | 1334 | */ |
56a37563 JG |
1335 | int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1336 | int pid) | |
ccf10263 MD |
1337 | { |
1338 | int ret; | |
1339 | ||
1340 | rcu_read_lock(); | |
1341 | ||
1342 | switch (domain) { | |
1343 | case LTTNG_DOMAIN_KERNEL: | |
1344 | { | |
1345 | struct ltt_kernel_session *ksess; | |
1346 | ||
1347 | ksess = session->kernel_session; | |
1348 | ||
1349 | ret = kernel_track_pid(ksess, pid); | |
1350 | if (ret != LTTNG_OK) { | |
1351 | goto error; | |
1352 | } | |
1353 | ||
1354 | kernel_wait_quiescent(kernel_tracer_fd); | |
1355 | break; | |
1356 | } | |
ccf10263 | 1357 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1358 | { |
1359 | struct ltt_ust_session *usess; | |
1360 | ||
1361 | usess = session->ust_session; | |
1362 | ||
1363 | ret = trace_ust_track_pid(usess, pid); | |
1364 | if (ret != LTTNG_OK) { | |
1365 | goto error; | |
1366 | } | |
1367 | break; | |
1368 | } | |
ccf10263 MD |
1369 | default: |
1370 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1371 | goto error; | |
1372 | } | |
1373 | ||
1374 | ret = LTTNG_OK; | |
1375 | ||
1376 | error: | |
1377 | rcu_read_unlock(); | |
1378 | return ret; | |
1379 | } | |
1380 | ||
1381 | /* | |
1382 | * Command LTTNG_UNTRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1383 | * |
1384 | * Called with session lock held. | |
ccf10263 | 1385 | */ |
56a37563 JG |
1386 | int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1387 | int pid) | |
ccf10263 MD |
1388 | { |
1389 | int ret; | |
1390 | ||
1391 | rcu_read_lock(); | |
1392 | ||
1393 | switch (domain) { | |
1394 | case LTTNG_DOMAIN_KERNEL: | |
1395 | { | |
1396 | struct ltt_kernel_session *ksess; | |
1397 | ||
1398 | ksess = session->kernel_session; | |
1399 | ||
1400 | ret = kernel_untrack_pid(ksess, pid); | |
1401 | if (ret != LTTNG_OK) { | |
1402 | goto error; | |
1403 | } | |
1404 | ||
1405 | kernel_wait_quiescent(kernel_tracer_fd); | |
1406 | break; | |
1407 | } | |
ccf10263 | 1408 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1409 | { |
1410 | struct ltt_ust_session *usess; | |
1411 | ||
1412 | usess = session->ust_session; | |
1413 | ||
1414 | ret = trace_ust_untrack_pid(usess, pid); | |
1415 | if (ret != LTTNG_OK) { | |
1416 | goto error; | |
1417 | } | |
1418 | break; | |
1419 | } | |
ccf10263 MD |
1420 | default: |
1421 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1422 | goto error; | |
1423 | } | |
1424 | ||
1425 | ret = LTTNG_OK; | |
1426 | ||
1427 | error: | |
1428 | rcu_read_unlock(); | |
1429 | return ret; | |
1430 | } | |
1431 | ||
2f77fc4b DG |
1432 | /* |
1433 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
1434 | * | |
1435 | * The wpipe arguments is used as a notifier for the kernel thread. | |
1436 | */ | |
1437 | int cmd_enable_channel(struct ltt_session *session, | |
7972aab2 | 1438 | struct lttng_domain *domain, struct lttng_channel *attr, int wpipe) |
2f77fc4b DG |
1439 | { |
1440 | int ret; | |
1441 | struct ltt_ust_session *usess = session->ust_session; | |
1442 | struct lttng_ht *chan_ht; | |
1f345e94 | 1443 | size_t len; |
2f77fc4b DG |
1444 | |
1445 | assert(session); | |
1446 | assert(attr); | |
7972aab2 | 1447 | assert(domain); |
2f77fc4b | 1448 | |
f5436bfc | 1449 | len = lttng_strnlen(attr->name, sizeof(attr->name)); |
1f345e94 PP |
1450 | |
1451 | /* Validate channel name */ | |
1452 | if (attr->name[0] == '.' || | |
1453 | memchr(attr->name, '/', len) != NULL) { | |
1454 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1455 | goto end; | |
1456 | } | |
1457 | ||
2f77fc4b DG |
1458 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
1459 | ||
03b4fdcf DG |
1460 | rcu_read_lock(); |
1461 | ||
ecc48a90 JD |
1462 | /* |
1463 | * Don't try to enable a channel if the session has been started at | |
1464 | * some point in time before. The tracer does not allow it. | |
1465 | */ | |
8382cf6f | 1466 | if (session->has_been_started) { |
ecc48a90 JD |
1467 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
1468 | goto error; | |
1469 | } | |
1470 | ||
1471 | /* | |
1472 | * If the session is a live session, remove the switch timer, the | |
1473 | * live timer does the same thing but sends also synchronisation | |
1474 | * beacons for inactive streams. | |
1475 | */ | |
1476 | if (session->live_timer > 0) { | |
1477 | attr->attr.live_timer_interval = session->live_timer; | |
1478 | attr->attr.switch_timer_interval = 0; | |
1479 | } | |
1480 | ||
6e21424e JR |
1481 | /* Check for feature support */ |
1482 | switch (domain->type) { | |
1483 | case LTTNG_DOMAIN_KERNEL: | |
1484 | { | |
1485 | if (kernel_supports_ring_buffer_snapshot_sample_positions(kernel_tracer_fd) != 1) { | |
1486 | /* Sampling position of buffer is not supported */ | |
1487 | WARN("Kernel tracer does not support buffer monitoring. " | |
1488 | "Setting the monitor interval timer to 0 " | |
1489 | "(disabled) for channel '%s' of session '%s'", | |
1490 | attr-> name, session->name); | |
1491 | lttng_channel_set_monitor_timer_interval(attr, 0); | |
1492 | } | |
1493 | break; | |
1494 | } | |
1495 | case LTTNG_DOMAIN_UST: | |
f28f9e44 | 1496 | break; |
6e21424e JR |
1497 | case LTTNG_DOMAIN_JUL: |
1498 | case LTTNG_DOMAIN_LOG4J: | |
1499 | case LTTNG_DOMAIN_PYTHON: | |
f28f9e44 JG |
1500 | if (!agent_tracing_is_enabled()) { |
1501 | DBG("Attempted to enable a channel in an agent domain but the agent thread is not running"); | |
1502 | ret = LTTNG_ERR_AGENT_TRACING_DISABLED; | |
1503 | goto error; | |
1504 | } | |
6e21424e JR |
1505 | break; |
1506 | default: | |
1507 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1508 | goto error; | |
1509 | } | |
1510 | ||
7972aab2 | 1511 | switch (domain->type) { |
2f77fc4b DG |
1512 | case LTTNG_DOMAIN_KERNEL: |
1513 | { | |
1514 | struct ltt_kernel_channel *kchan; | |
1515 | ||
2f77fc4b DG |
1516 | kchan = trace_kernel_get_channel_by_name(attr->name, |
1517 | session->kernel_session); | |
1518 | if (kchan == NULL) { | |
1519 | ret = channel_kernel_create(session->kernel_session, attr, wpipe); | |
85076754 MD |
1520 | if (attr->name[0] != '\0') { |
1521 | session->kernel_session->has_non_default_channel = 1; | |
1522 | } | |
2f77fc4b DG |
1523 | } else { |
1524 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
1525 | } | |
1526 | ||
f73fabfd | 1527 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1528 | goto error; |
1529 | } | |
1530 | ||
784303b0 | 1531 | kernel_wait_quiescent(kernel_tracer_fd); |
2f77fc4b DG |
1532 | break; |
1533 | } | |
1534 | case LTTNG_DOMAIN_UST: | |
9232818f JG |
1535 | case LTTNG_DOMAIN_JUL: |
1536 | case LTTNG_DOMAIN_LOG4J: | |
1537 | case LTTNG_DOMAIN_PYTHON: | |
2f77fc4b DG |
1538 | { |
1539 | struct ltt_ust_channel *uchan; | |
1540 | ||
9232818f JG |
1541 | /* |
1542 | * FIXME | |
1543 | * | |
1544 | * Current agent implementation limitations force us to allow | |
1545 | * only one channel at once in "agent" subdomains. Each | |
1546 | * subdomain has a default channel name which must be strictly | |
1547 | * adhered to. | |
1548 | */ | |
1549 | if (domain->type == LTTNG_DOMAIN_JUL) { | |
1550 | if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME, | |
1551 | LTTNG_SYMBOL_NAME_LEN)) { | |
1552 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1553 | goto error; | |
1554 | } | |
1555 | } else if (domain->type == LTTNG_DOMAIN_LOG4J) { | |
1556 | if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME, | |
1557 | LTTNG_SYMBOL_NAME_LEN)) { | |
1558 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1559 | goto error; | |
1560 | } | |
1561 | } else if (domain->type == LTTNG_DOMAIN_PYTHON) { | |
1562 | if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME, | |
1563 | LTTNG_SYMBOL_NAME_LEN)) { | |
1564 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1565 | goto error; | |
1566 | } | |
1567 | } | |
1568 | ||
2f77fc4b DG |
1569 | chan_ht = usess->domain_global.channels; |
1570 | ||
1571 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); | |
1572 | if (uchan == NULL) { | |
7972aab2 | 1573 | ret = channel_ust_create(usess, attr, domain->buf_type); |
85076754 MD |
1574 | if (attr->name[0] != '\0') { |
1575 | usess->has_non_default_channel = 1; | |
1576 | } | |
2f77fc4b | 1577 | } else { |
7972aab2 | 1578 | ret = channel_ust_enable(usess, uchan); |
2f77fc4b DG |
1579 | } |
1580 | break; | |
1581 | } | |
2f77fc4b | 1582 | default: |
f73fabfd | 1583 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1584 | goto error; |
1585 | } | |
1586 | ||
1587 | error: | |
2223c96f | 1588 | rcu_read_unlock(); |
1f345e94 | 1589 | end: |
2f77fc4b DG |
1590 | return ret; |
1591 | } | |
1592 | ||
2f77fc4b DG |
1593 | /* |
1594 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1595 | */ | |
56a37563 JG |
1596 | int cmd_disable_event(struct ltt_session *session, |
1597 | enum lttng_domain_type domain, char *channel_name, | |
6e911cad | 1598 | struct lttng_event *event) |
2f77fc4b DG |
1599 | { |
1600 | int ret; | |
6e911cad MD |
1601 | char *event_name; |
1602 | ||
18a720cd MD |
1603 | DBG("Disable event command for event \'%s\'", event->name); |
1604 | ||
6e911cad MD |
1605 | event_name = event->name; |
1606 | ||
9b7431cf JG |
1607 | /* Error out on unhandled search criteria */ |
1608 | if (event->loglevel_type || event->loglevel != -1 || event->enabled | |
6e911cad | 1609 | || event->pid || event->filter || event->exclusion) { |
7076b56e JG |
1610 | ret = LTTNG_ERR_UNK; |
1611 | goto error; | |
6e911cad | 1612 | } |
2f77fc4b | 1613 | |
2223c96f DG |
1614 | rcu_read_lock(); |
1615 | ||
2f77fc4b DG |
1616 | switch (domain) { |
1617 | case LTTNG_DOMAIN_KERNEL: | |
1618 | { | |
1619 | struct ltt_kernel_channel *kchan; | |
1620 | struct ltt_kernel_session *ksess; | |
1621 | ||
1622 | ksess = session->kernel_session; | |
1623 | ||
85076754 MD |
1624 | /* |
1625 | * If a non-default channel has been created in the | |
1626 | * session, explicitely require that -c chan_name needs | |
1627 | * to be provided. | |
1628 | */ | |
1629 | if (ksess->has_non_default_channel && channel_name[0] == '\0') { | |
1630 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1631 | goto error_unlock; |
85076754 MD |
1632 | } |
1633 | ||
2f77fc4b DG |
1634 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
1635 | if (kchan == NULL) { | |
f73fabfd | 1636 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
7076b56e | 1637 | goto error_unlock; |
2f77fc4b DG |
1638 | } |
1639 | ||
6e911cad MD |
1640 | switch (event->type) { |
1641 | case LTTNG_EVENT_ALL: | |
9550ee81 | 1642 | case LTTNG_EVENT_TRACEPOINT: |
d0ae4ea8 | 1643 | case LTTNG_EVENT_SYSCALL: |
9550ee81 JR |
1644 | case LTTNG_EVENT_PROBE: |
1645 | case LTTNG_EVENT_FUNCTION: | |
1646 | case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */ | |
1647 | if (event_name[0] == '\0') { | |
1648 | ret = event_kernel_disable_event(kchan, | |
1649 | NULL, event->type); | |
29c62722 | 1650 | } else { |
d0ae4ea8 | 1651 | ret = event_kernel_disable_event(kchan, |
9550ee81 | 1652 | event_name, event->type); |
29c62722 | 1653 | } |
6e911cad | 1654 | if (ret != LTTNG_OK) { |
7076b56e | 1655 | goto error_unlock; |
6e911cad MD |
1656 | } |
1657 | break; | |
6e911cad MD |
1658 | default: |
1659 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1660 | goto error_unlock; |
2f77fc4b DG |
1661 | } |
1662 | ||
1663 | kernel_wait_quiescent(kernel_tracer_fd); | |
1664 | break; | |
1665 | } | |
1666 | case LTTNG_DOMAIN_UST: | |
1667 | { | |
1668 | struct ltt_ust_channel *uchan; | |
1669 | struct ltt_ust_session *usess; | |
1670 | ||
1671 | usess = session->ust_session; | |
1672 | ||
7076b56e JG |
1673 | if (validate_ust_event_name(event_name)) { |
1674 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1675 | goto error_unlock; | |
1676 | } | |
1677 | ||
85076754 MD |
1678 | /* |
1679 | * If a non-default channel has been created in the | |
9550ee81 | 1680 | * session, explicitly require that -c chan_name needs |
85076754 MD |
1681 | * to be provided. |
1682 | */ | |
1683 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1684 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1685 | goto error_unlock; |
85076754 MD |
1686 | } |
1687 | ||
2f77fc4b DG |
1688 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
1689 | channel_name); | |
1690 | if (uchan == NULL) { | |
f73fabfd | 1691 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
7076b56e | 1692 | goto error_unlock; |
2f77fc4b DG |
1693 | } |
1694 | ||
6e911cad MD |
1695 | switch (event->type) { |
1696 | case LTTNG_EVENT_ALL: | |
b3639870 JR |
1697 | /* |
1698 | * An empty event name means that everything | |
1699 | * should be disabled. | |
1700 | */ | |
1701 | if (event->name[0] == '\0') { | |
1702 | ret = event_ust_disable_all_tracepoints(usess, uchan); | |
77d536b2 JR |
1703 | } else { |
1704 | ret = event_ust_disable_tracepoint(usess, uchan, | |
1705 | event_name); | |
1706 | } | |
6e911cad | 1707 | if (ret != LTTNG_OK) { |
7076b56e | 1708 | goto error_unlock; |
6e911cad MD |
1709 | } |
1710 | break; | |
1711 | default: | |
1712 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1713 | goto error_unlock; |
2f77fc4b DG |
1714 | } |
1715 | ||
1716 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
1717 | channel_name); | |
1718 | break; | |
1719 | } | |
5cdb6027 | 1720 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1721 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1722 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1723 | { |
fefd409b | 1724 | struct agent *agt; |
f20baf8e DG |
1725 | struct ltt_ust_session *usess = session->ust_session; |
1726 | ||
1727 | assert(usess); | |
1728 | ||
6e911cad MD |
1729 | switch (event->type) { |
1730 | case LTTNG_EVENT_ALL: | |
1731 | break; | |
1732 | default: | |
1733 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1734 | goto error_unlock; |
6e911cad MD |
1735 | } |
1736 | ||
5cdb6027 | 1737 | agt = trace_ust_find_agent(usess, domain); |
fefd409b DG |
1738 | if (!agt) { |
1739 | ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
7076b56e | 1740 | goto error_unlock; |
fefd409b | 1741 | } |
b3639870 JR |
1742 | /* |
1743 | * An empty event name means that everything | |
1744 | * should be disabled. | |
1745 | */ | |
1746 | if (event->name[0] == '\0') { | |
18a720cd MD |
1747 | ret = event_agent_disable_all(usess, agt); |
1748 | } else { | |
1749 | ret = event_agent_disable(usess, agt, event_name); | |
1750 | } | |
f20baf8e | 1751 | if (ret != LTTNG_OK) { |
7076b56e | 1752 | goto error_unlock; |
f20baf8e DG |
1753 | } |
1754 | ||
1755 | break; | |
1756 | } | |
2f77fc4b | 1757 | default: |
f73fabfd | 1758 | ret = LTTNG_ERR_UND; |
7076b56e | 1759 | goto error_unlock; |
2f77fc4b DG |
1760 | } |
1761 | ||
f73fabfd | 1762 | ret = LTTNG_OK; |
2f77fc4b | 1763 | |
7076b56e | 1764 | error_unlock: |
2223c96f | 1765 | rcu_read_unlock(); |
7076b56e | 1766 | error: |
2f77fc4b DG |
1767 | return ret; |
1768 | } | |
1769 | ||
2f77fc4b DG |
1770 | /* |
1771 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1772 | */ | |
56a37563 | 1773 | int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain, |
601d5acf | 1774 | char *channel_name, struct lttng_event_context *ctx, int kwpipe) |
2f77fc4b | 1775 | { |
d5979e4a | 1776 | int ret, chan_kern_created = 0, chan_ust_created = 0; |
bdf64013 JG |
1777 | char *app_ctx_provider_name = NULL, *app_ctx_name = NULL; |
1778 | ||
9a699f7b JR |
1779 | /* |
1780 | * Don't try to add a context if the session has been started at | |
1781 | * some point in time before. The tracer does not allow it and would | |
1782 | * result in a corrupted trace. | |
1783 | */ | |
1784 | if (session->has_been_started) { | |
1785 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; | |
1786 | goto end; | |
1787 | } | |
1788 | ||
bdf64013 JG |
1789 | if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) { |
1790 | app_ctx_provider_name = ctx->u.app_ctx.provider_name; | |
1791 | app_ctx_name = ctx->u.app_ctx.ctx_name; | |
1792 | } | |
2f77fc4b DG |
1793 | |
1794 | switch (domain) { | |
1795 | case LTTNG_DOMAIN_KERNEL: | |
979e618e DG |
1796 | assert(session->kernel_session); |
1797 | ||
1798 | if (session->kernel_session->channel_count == 0) { | |
1799 | /* Create default channel */ | |
1800 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); | |
1801 | if (ret != LTTNG_OK) { | |
1802 | goto error; | |
1803 | } | |
d5979e4a | 1804 | chan_kern_created = 1; |
979e618e | 1805 | } |
2f77fc4b | 1806 | /* Add kernel context to kernel tracer */ |
601d5acf | 1807 | ret = context_kernel_add(session->kernel_session, ctx, channel_name); |
f73fabfd | 1808 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1809 | goto error; |
1810 | } | |
1811 | break; | |
bdf64013 JG |
1812 | case LTTNG_DOMAIN_JUL: |
1813 | case LTTNG_DOMAIN_LOG4J: | |
1814 | { | |
1815 | /* | |
1816 | * Validate channel name. | |
1817 | * If no channel name is given and the domain is JUL or LOG4J, | |
1818 | * set it to the appropriate domain-specific channel name. If | |
1819 | * a name is provided but does not match the expexted channel | |
1820 | * name, return an error. | |
1821 | */ | |
1822 | if (domain == LTTNG_DOMAIN_JUL && *channel_name && | |
1823 | strcmp(channel_name, | |
1824 | DEFAULT_JUL_CHANNEL_NAME)) { | |
1825 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1826 | goto error; | |
1827 | } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name && | |
1828 | strcmp(channel_name, | |
1829 | DEFAULT_LOG4J_CHANNEL_NAME)) { | |
1830 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1831 | goto error; | |
1832 | } | |
a93b3916 | 1833 | /* break is _not_ missing here. */ |
bdf64013 | 1834 | } |
2f77fc4b DG |
1835 | case LTTNG_DOMAIN_UST: |
1836 | { | |
1837 | struct ltt_ust_session *usess = session->ust_session; | |
85076754 MD |
1838 | unsigned int chan_count; |
1839 | ||
2f77fc4b DG |
1840 | assert(usess); |
1841 | ||
85076754 | 1842 | chan_count = lttng_ht_get_count(usess->domain_global.channels); |
979e618e DG |
1843 | if (chan_count == 0) { |
1844 | struct lttng_channel *attr; | |
1845 | /* Create default channel */ | |
0a9c6494 | 1846 | attr = channel_new_default_attr(domain, usess->buffer_type); |
979e618e DG |
1847 | if (attr == NULL) { |
1848 | ret = LTTNG_ERR_FATAL; | |
1849 | goto error; | |
1850 | } | |
1851 | ||
7972aab2 | 1852 | ret = channel_ust_create(usess, attr, usess->buffer_type); |
979e618e DG |
1853 | if (ret != LTTNG_OK) { |
1854 | free(attr); | |
1855 | goto error; | |
1856 | } | |
cf0bcb51 | 1857 | channel_attr_destroy(attr); |
d5979e4a | 1858 | chan_ust_created = 1; |
979e618e DG |
1859 | } |
1860 | ||
601d5acf | 1861 | ret = context_ust_add(usess, domain, ctx, channel_name); |
bdf64013 JG |
1862 | free(app_ctx_provider_name); |
1863 | free(app_ctx_name); | |
1864 | app_ctx_name = NULL; | |
1865 | app_ctx_provider_name = NULL; | |
f73fabfd | 1866 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1867 | goto error; |
1868 | } | |
1869 | break; | |
1870 | } | |
2f77fc4b | 1871 | default: |
f73fabfd | 1872 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1873 | goto error; |
1874 | } | |
1875 | ||
bdf64013 JG |
1876 | ret = LTTNG_OK; |
1877 | goto end; | |
2f77fc4b DG |
1878 | |
1879 | error: | |
d5979e4a DG |
1880 | if (chan_kern_created) { |
1881 | struct ltt_kernel_channel *kchan = | |
1882 | trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME, | |
1883 | session->kernel_session); | |
1884 | /* Created previously, this should NOT fail. */ | |
1885 | assert(kchan); | |
1886 | kernel_destroy_channel(kchan); | |
1887 | } | |
1888 | ||
1889 | if (chan_ust_created) { | |
1890 | struct ltt_ust_channel *uchan = | |
1891 | trace_ust_find_channel_by_name( | |
1892 | session->ust_session->domain_global.channels, | |
1893 | DEFAULT_CHANNEL_NAME); | |
1894 | /* Created previously, this should NOT fail. */ | |
1895 | assert(uchan); | |
1896 | /* Remove from the channel list of the session. */ | |
1897 | trace_ust_delete_channel(session->ust_session->domain_global.channels, | |
1898 | uchan); | |
1899 | trace_ust_destroy_channel(uchan); | |
1900 | } | |
bdf64013 JG |
1901 | end: |
1902 | free(app_ctx_provider_name); | |
1903 | free(app_ctx_name); | |
2f77fc4b DG |
1904 | return ret; |
1905 | } | |
1906 | ||
dac8e046 JG |
1907 | static inline bool name_starts_with(const char *name, const char *prefix) |
1908 | { | |
1909 | const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN); | |
1910 | ||
1911 | return !strncmp(name, prefix, max_cmp_len); | |
1912 | } | |
1913 | ||
1914 | /* Perform userspace-specific event name validation */ | |
1915 | static int validate_ust_event_name(const char *name) | |
1916 | { | |
1917 | int ret = 0; | |
1918 | ||
1919 | if (!name) { | |
1920 | ret = -1; | |
1921 | goto end; | |
1922 | } | |
1923 | ||
1924 | /* | |
1925 | * Check name against all internal UST event component namespaces used | |
1926 | * by the agents. | |
1927 | */ | |
1928 | if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) || | |
1929 | name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) || | |
1930 | name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) { | |
1931 | ret = -1; | |
1932 | } | |
1933 | ||
1934 | end: | |
1935 | return ret; | |
1936 | } | |
88f06f15 | 1937 | |
2f77fc4b | 1938 | /* |
88f06f15 JG |
1939 | * Internal version of cmd_enable_event() with a supplemental |
1940 | * "internal_event" flag which is used to enable internal events which should | |
1941 | * be hidden from clients. Such events are used in the agent implementation to | |
1942 | * enable the events through which all "agent" events are funeled. | |
2f77fc4b | 1943 | */ |
88f06f15 JG |
1944 | static int _cmd_enable_event(struct ltt_session *session, |
1945 | struct lttng_domain *domain, | |
025faf73 | 1946 | char *channel_name, struct lttng_event *event, |
6b453b5e | 1947 | char *filter_expression, |
db8f1377 JI |
1948 | struct lttng_filter_bytecode *filter, |
1949 | struct lttng_event_exclusion *exclusion, | |
88f06f15 | 1950 | int wpipe, bool internal_event) |
2f77fc4b | 1951 | { |
9f449915 | 1952 | int ret = 0, channel_created = 0; |
cfedea03 | 1953 | struct lttng_channel *attr = NULL; |
2f77fc4b DG |
1954 | |
1955 | assert(session); | |
1956 | assert(event); | |
1957 | assert(channel_name); | |
1958 | ||
2a385866 JG |
1959 | /* If we have a filter, we must have its filter expression */ |
1960 | assert(!(!!filter_expression ^ !!filter)); | |
1961 | ||
9f449915 PP |
1962 | /* Normalize event name as a globbing pattern */ |
1963 | strutils_normalize_star_glob_pattern(event->name); | |
18a720cd | 1964 | |
9f449915 PP |
1965 | /* Normalize exclusion names as globbing patterns */ |
1966 | if (exclusion) { | |
1967 | size_t i; | |
f5ac4bd7 | 1968 | |
9f449915 PP |
1969 | for (i = 0; i < exclusion->count; i++) { |
1970 | char *name = LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i); | |
1971 | ||
1972 | strutils_normalize_star_glob_pattern(name); | |
1973 | } | |
930a2e99 JG |
1974 | } |
1975 | ||
9f449915 PP |
1976 | DBG("Enable event command for event \'%s\'", event->name); |
1977 | ||
1978 | rcu_read_lock(); | |
1979 | ||
7972aab2 | 1980 | switch (domain->type) { |
2f77fc4b DG |
1981 | case LTTNG_DOMAIN_KERNEL: |
1982 | { | |
1983 | struct ltt_kernel_channel *kchan; | |
1984 | ||
85076754 MD |
1985 | /* |
1986 | * If a non-default channel has been created in the | |
1987 | * session, explicitely require that -c chan_name needs | |
1988 | * to be provided. | |
1989 | */ | |
1990 | if (session->kernel_session->has_non_default_channel | |
1991 | && channel_name[0] == '\0') { | |
1992 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
1993 | goto error; | |
1994 | } | |
1995 | ||
2f77fc4b DG |
1996 | kchan = trace_kernel_get_channel_by_name(channel_name, |
1997 | session->kernel_session); | |
1998 | if (kchan == NULL) { | |
0a9c6494 DG |
1999 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
2000 | LTTNG_BUFFER_GLOBAL); | |
2f77fc4b | 2001 | if (attr == NULL) { |
f73fabfd | 2002 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2003 | goto error; |
2004 | } | |
04c17253 MD |
2005 | if (lttng_strncpy(attr->name, channel_name, |
2006 | sizeof(attr->name))) { | |
2007 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
2008 | goto error; |
2009 | } | |
2f77fc4b DG |
2010 | |
2011 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 2012 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2013 | goto error; |
2014 | } | |
e5f5db7f | 2015 | channel_created = 1; |
2f77fc4b DG |
2016 | } |
2017 | ||
2018 | /* Get the newly created kernel channel pointer */ | |
2019 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2020 | session->kernel_session); | |
2021 | if (kchan == NULL) { | |
2022 | /* This sould not happen... */ | |
f73fabfd | 2023 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2024 | goto error; |
2025 | } | |
2026 | ||
6e911cad MD |
2027 | switch (event->type) { |
2028 | case LTTNG_EVENT_ALL: | |
29c62722 | 2029 | { |
00a62084 MD |
2030 | char *filter_expression_a = NULL; |
2031 | struct lttng_filter_bytecode *filter_a = NULL; | |
2032 | ||
2033 | /* | |
2034 | * We need to duplicate filter_expression and filter, | |
2035 | * because ownership is passed to first enable | |
2036 | * event. | |
2037 | */ | |
2038 | if (filter_expression) { | |
2039 | filter_expression_a = strdup(filter_expression); | |
2040 | if (!filter_expression_a) { | |
2041 | ret = LTTNG_ERR_FATAL; | |
2042 | goto error; | |
2043 | } | |
2044 | } | |
2045 | if (filter) { | |
2046 | filter_a = zmalloc(sizeof(*filter_a) + filter->len); | |
2047 | if (!filter_a) { | |
2048 | free(filter_expression_a); | |
2049 | ret = LTTNG_ERR_FATAL; | |
2050 | goto error; | |
2051 | } | |
2052 | memcpy(filter_a, filter, sizeof(*filter_a) + filter->len); | |
2053 | } | |
29c62722 | 2054 | event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */ |
00a62084 MD |
2055 | ret = event_kernel_enable_event(kchan, event, |
2056 | filter_expression, filter); | |
a969e101 MD |
2057 | /* We have passed ownership */ |
2058 | filter_expression = NULL; | |
2059 | filter = NULL; | |
29c62722 MD |
2060 | if (ret != LTTNG_OK) { |
2061 | if (channel_created) { | |
2062 | /* Let's not leak a useless channel. */ | |
2063 | kernel_destroy_channel(kchan); | |
2064 | } | |
00a62084 MD |
2065 | free(filter_expression_a); |
2066 | free(filter_a); | |
29c62722 MD |
2067 | goto error; |
2068 | } | |
2069 | event->type = LTTNG_EVENT_SYSCALL; /* Hack */ | |
00a62084 MD |
2070 | ret = event_kernel_enable_event(kchan, event, |
2071 | filter_expression_a, filter_a); | |
60d21fa2 AB |
2072 | /* We have passed ownership */ |
2073 | filter_expression_a = NULL; | |
2074 | filter_a = NULL; | |
29c62722 MD |
2075 | if (ret != LTTNG_OK) { |
2076 | goto error; | |
2077 | } | |
2078 | break; | |
2079 | } | |
6e6ef3d7 | 2080 | case LTTNG_EVENT_PROBE: |
dcabc190 | 2081 | case LTTNG_EVENT_USERSPACE_PROBE: |
6e6ef3d7 DG |
2082 | case LTTNG_EVENT_FUNCTION: |
2083 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
6e911cad | 2084 | case LTTNG_EVENT_TRACEPOINT: |
00a62084 MD |
2085 | ret = event_kernel_enable_event(kchan, event, |
2086 | filter_expression, filter); | |
a969e101 MD |
2087 | /* We have passed ownership */ |
2088 | filter_expression = NULL; | |
2089 | filter = NULL; | |
6e911cad MD |
2090 | if (ret != LTTNG_OK) { |
2091 | if (channel_created) { | |
2092 | /* Let's not leak a useless channel. */ | |
2093 | kernel_destroy_channel(kchan); | |
2094 | } | |
2095 | goto error; | |
e5f5db7f | 2096 | } |
6e911cad MD |
2097 | break; |
2098 | case LTTNG_EVENT_SYSCALL: | |
00a62084 MD |
2099 | ret = event_kernel_enable_event(kchan, event, |
2100 | filter_expression, filter); | |
a969e101 MD |
2101 | /* We have passed ownership */ |
2102 | filter_expression = NULL; | |
2103 | filter = NULL; | |
e2b957af MD |
2104 | if (ret != LTTNG_OK) { |
2105 | goto error; | |
2106 | } | |
6e911cad MD |
2107 | break; |
2108 | default: | |
2109 | ret = LTTNG_ERR_UNK; | |
2f77fc4b DG |
2110 | goto error; |
2111 | } | |
2112 | ||
2113 | kernel_wait_quiescent(kernel_tracer_fd); | |
2114 | break; | |
2115 | } | |
2116 | case LTTNG_DOMAIN_UST: | |
2117 | { | |
2118 | struct ltt_ust_channel *uchan; | |
2119 | struct ltt_ust_session *usess = session->ust_session; | |
2120 | ||
2121 | assert(usess); | |
2122 | ||
85076754 MD |
2123 | /* |
2124 | * If a non-default channel has been created in the | |
2125 | * session, explicitely require that -c chan_name needs | |
2126 | * to be provided. | |
2127 | */ | |
2128 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
2129 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
2130 | goto error; | |
2131 | } | |
2132 | ||
2f77fc4b DG |
2133 | /* Get channel from global UST domain */ |
2134 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2135 | channel_name); | |
2136 | if (uchan == NULL) { | |
2137 | /* Create default channel */ | |
0a9c6494 DG |
2138 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
2139 | usess->buffer_type); | |
2f77fc4b | 2140 | if (attr == NULL) { |
f73fabfd | 2141 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2142 | goto error; |
2143 | } | |
04c17253 MD |
2144 | if (lttng_strncpy(attr->name, channel_name, |
2145 | sizeof(attr->name))) { | |
2146 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
2147 | goto error; |
2148 | } | |
2f77fc4b DG |
2149 | |
2150 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 2151 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2152 | goto error; |
2153 | } | |
2f77fc4b DG |
2154 | |
2155 | /* Get the newly created channel reference back */ | |
2156 | uchan = trace_ust_find_channel_by_name( | |
2157 | usess->domain_global.channels, channel_name); | |
2158 | assert(uchan); | |
2159 | } | |
2160 | ||
141feb8c JG |
2161 | if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) { |
2162 | /* | |
2163 | * Don't allow users to add UST events to channels which | |
2164 | * are assigned to a userspace subdomain (JUL, Log4J, | |
2165 | * Python, etc.). | |
2166 | */ | |
2167 | ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN; | |
2168 | goto error; | |
2169 | } | |
2170 | ||
dac8e046 JG |
2171 | if (!internal_event) { |
2172 | /* | |
2173 | * Ensure the event name is not reserved for internal | |
2174 | * use. | |
2175 | */ | |
2176 | ret = validate_ust_event_name(event->name); | |
2177 | if (ret) { | |
2178 | WARN("Userspace event name %s failed validation.", | |
bbcab087 | 2179 | event->name); |
dac8e046 JG |
2180 | ret = LTTNG_ERR_INVALID_EVENT_NAME; |
2181 | goto error; | |
2182 | } | |
2183 | } | |
2184 | ||
2f77fc4b | 2185 | /* At this point, the session and channel exist on the tracer */ |
6b453b5e | 2186 | ret = event_ust_enable_tracepoint(usess, uchan, event, |
88f06f15 JG |
2187 | filter_expression, filter, exclusion, |
2188 | internal_event); | |
49d21f93 MD |
2189 | /* We have passed ownership */ |
2190 | filter_expression = NULL; | |
2191 | filter = NULL; | |
2192 | exclusion = NULL; | |
94382e15 JG |
2193 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2194 | goto already_enabled; | |
2195 | } else if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2196 | goto error; |
2197 | } | |
2198 | break; | |
2199 | } | |
5cdb6027 | 2200 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 2201 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2202 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 2203 | { |
da6c3a50 | 2204 | const char *default_event_name, *default_chan_name; |
fefd409b | 2205 | struct agent *agt; |
f20baf8e DG |
2206 | struct lttng_event uevent; |
2207 | struct lttng_domain tmp_dom; | |
2208 | struct ltt_ust_session *usess = session->ust_session; | |
2209 | ||
2210 | assert(usess); | |
2211 | ||
f28f9e44 JG |
2212 | if (!agent_tracing_is_enabled()) { |
2213 | DBG("Attempted to enable an event in an agent domain but the agent thread is not running"); | |
2214 | ret = LTTNG_ERR_AGENT_TRACING_DISABLED; | |
2215 | goto error; | |
2216 | } | |
2217 | ||
5cdb6027 | 2218 | agt = trace_ust_find_agent(usess, domain->type); |
fefd409b | 2219 | if (!agt) { |
5cdb6027 | 2220 | agt = agent_create(domain->type); |
fefd409b | 2221 | if (!agt) { |
e5b3c48c | 2222 | ret = LTTNG_ERR_NOMEM; |
fefd409b DG |
2223 | goto error; |
2224 | } | |
2225 | agent_add(agt, usess->agents); | |
2226 | } | |
2227 | ||
022d91ba | 2228 | /* Create the default tracepoint. */ |
996de3c7 | 2229 | memset(&uevent, 0, sizeof(uevent)); |
f20baf8e DG |
2230 | uevent.type = LTTNG_EVENT_TRACEPOINT; |
2231 | uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
51755dc8 JG |
2232 | default_event_name = event_get_default_agent_ust_name( |
2233 | domain->type); | |
da6c3a50 | 2234 | if (!default_event_name) { |
e5b3c48c | 2235 | ret = LTTNG_ERR_FATAL; |
da6c3a50 | 2236 | goto error; |
f43f95a9 | 2237 | } |
da6c3a50 | 2238 | strncpy(uevent.name, default_event_name, sizeof(uevent.name)); |
f20baf8e DG |
2239 | uevent.name[sizeof(uevent.name) - 1] = '\0'; |
2240 | ||
2241 | /* | |
2242 | * The domain type is changed because we are about to enable the | |
2243 | * default channel and event for the JUL domain that are hardcoded. | |
2244 | * This happens in the UST domain. | |
2245 | */ | |
2246 | memcpy(&tmp_dom, domain, sizeof(tmp_dom)); | |
2247 | tmp_dom.type = LTTNG_DOMAIN_UST; | |
2248 | ||
0e115563 DG |
2249 | switch (domain->type) { |
2250 | case LTTNG_DOMAIN_LOG4J: | |
da6c3a50 | 2251 | default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME; |
0e115563 DG |
2252 | break; |
2253 | case LTTNG_DOMAIN_JUL: | |
da6c3a50 | 2254 | default_chan_name = DEFAULT_JUL_CHANNEL_NAME; |
0e115563 DG |
2255 | break; |
2256 | case LTTNG_DOMAIN_PYTHON: | |
2257 | default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
2258 | break; | |
2259 | default: | |
e98a44b0 | 2260 | /* The switch/case we are in makes this impossible */ |
0e115563 | 2261 | assert(0); |
da6c3a50 DG |
2262 | } |
2263 | ||
971da06a | 2264 | { |
8404118c | 2265 | char *filter_expression_copy = NULL; |
51755dc8 | 2266 | struct lttng_filter_bytecode *filter_copy = NULL; |
971da06a JG |
2267 | |
2268 | if (filter) { | |
51755dc8 JG |
2269 | const size_t filter_size = sizeof( |
2270 | struct lttng_filter_bytecode) | |
2271 | + filter->len; | |
2272 | ||
2273 | filter_copy = zmalloc(filter_size); | |
971da06a | 2274 | if (!filter_copy) { |
018096a4 | 2275 | ret = LTTNG_ERR_NOMEM; |
b742e3e2 | 2276 | goto error; |
971da06a | 2277 | } |
51755dc8 | 2278 | memcpy(filter_copy, filter, filter_size); |
971da06a | 2279 | |
8404118c JG |
2280 | filter_expression_copy = |
2281 | strdup(filter_expression); | |
2282 | if (!filter_expression) { | |
2283 | ret = LTTNG_ERR_NOMEM; | |
51755dc8 JG |
2284 | } |
2285 | ||
2286 | if (!filter_expression_copy || !filter_copy) { | |
2287 | free(filter_expression_copy); | |
2288 | free(filter_copy); | |
2289 | goto error; | |
8404118c | 2290 | } |
971da06a JG |
2291 | } |
2292 | ||
88f06f15 | 2293 | ret = cmd_enable_event_internal(session, &tmp_dom, |
971da06a | 2294 | (char *) default_chan_name, |
8404118c JG |
2295 | &uevent, filter_expression_copy, |
2296 | filter_copy, NULL, wpipe); | |
971da06a JG |
2297 | } |
2298 | ||
94382e15 JG |
2299 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2300 | goto already_enabled; | |
2301 | } else if (ret != LTTNG_OK) { | |
f20baf8e DG |
2302 | goto error; |
2303 | } | |
2304 | ||
2305 | /* The wild card * means that everything should be enabled. */ | |
2306 | if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) { | |
8404118c JG |
2307 | ret = event_agent_enable_all(usess, agt, event, filter, |
2308 | filter_expression); | |
f20baf8e | 2309 | } else { |
8404118c JG |
2310 | ret = event_agent_enable(usess, agt, event, filter, |
2311 | filter_expression); | |
f20baf8e | 2312 | } |
51755dc8 JG |
2313 | filter = NULL; |
2314 | filter_expression = NULL; | |
f20baf8e DG |
2315 | if (ret != LTTNG_OK) { |
2316 | goto error; | |
2317 | } | |
2318 | ||
2319 | break; | |
2320 | } | |
2f77fc4b | 2321 | default: |
f73fabfd | 2322 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2323 | goto error; |
2324 | } | |
2325 | ||
f73fabfd | 2326 | ret = LTTNG_OK; |
2f77fc4b | 2327 | |
94382e15 | 2328 | already_enabled: |
2f77fc4b | 2329 | error: |
49d21f93 MD |
2330 | free(filter_expression); |
2331 | free(filter); | |
2332 | free(exclusion); | |
cf0bcb51 | 2333 | channel_attr_destroy(attr); |
2223c96f | 2334 | rcu_read_unlock(); |
2f77fc4b DG |
2335 | return ret; |
2336 | } | |
2337 | ||
88f06f15 JG |
2338 | /* |
2339 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2340 | * We own filter, exclusion, and filter_expression. | |
2341 | */ | |
2342 | int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain, | |
2343 | char *channel_name, struct lttng_event *event, | |
2344 | char *filter_expression, | |
2345 | struct lttng_filter_bytecode *filter, | |
2346 | struct lttng_event_exclusion *exclusion, | |
2347 | int wpipe) | |
2348 | { | |
2349 | return _cmd_enable_event(session, domain, channel_name, event, | |
2350 | filter_expression, filter, exclusion, wpipe, false); | |
2351 | } | |
2352 | ||
2353 | /* | |
2354 | * Enable an event which is internal to LTTng. An internal should | |
2355 | * never be made visible to clients and are immune to checks such as | |
2356 | * reserved names. | |
2357 | */ | |
2358 | static int cmd_enable_event_internal(struct ltt_session *session, | |
2359 | struct lttng_domain *domain, | |
2360 | char *channel_name, struct lttng_event *event, | |
2361 | char *filter_expression, | |
2362 | struct lttng_filter_bytecode *filter, | |
2363 | struct lttng_event_exclusion *exclusion, | |
2364 | int wpipe) | |
2365 | { | |
2366 | return _cmd_enable_event(session, domain, channel_name, event, | |
2367 | filter_expression, filter, exclusion, wpipe, true); | |
2368 | } | |
2369 | ||
2f77fc4b DG |
2370 | /* |
2371 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2372 | */ | |
56a37563 JG |
2373 | ssize_t cmd_list_tracepoints(enum lttng_domain_type domain, |
2374 | struct lttng_event **events) | |
2f77fc4b DG |
2375 | { |
2376 | int ret; | |
2377 | ssize_t nb_events = 0; | |
2378 | ||
2379 | switch (domain) { | |
2380 | case LTTNG_DOMAIN_KERNEL: | |
2381 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2382 | if (nb_events < 0) { | |
f73fabfd | 2383 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
2f77fc4b DG |
2384 | goto error; |
2385 | } | |
2386 | break; | |
2387 | case LTTNG_DOMAIN_UST: | |
2388 | nb_events = ust_app_list_events(events); | |
2389 | if (nb_events < 0) { | |
f73fabfd | 2390 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2391 | goto error; |
2392 | } | |
2393 | break; | |
5cdb6027 | 2394 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2395 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2396 | case LTTNG_DOMAIN_PYTHON: |
f60140a1 | 2397 | nb_events = agent_list_events(events, domain); |
3c6a091f DG |
2398 | if (nb_events < 0) { |
2399 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2400 | goto error; | |
2401 | } | |
2402 | break; | |
2f77fc4b | 2403 | default: |
f73fabfd | 2404 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2405 | goto error; |
2406 | } | |
2407 | ||
2408 | return nb_events; | |
2409 | ||
2410 | error: | |
2411 | /* Return negative value to differentiate return code */ | |
2412 | return -ret; | |
2413 | } | |
2414 | ||
2415 | /* | |
2416 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
2417 | */ | |
56a37563 | 2418 | ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain, |
2f77fc4b DG |
2419 | struct lttng_event_field **fields) |
2420 | { | |
2421 | int ret; | |
2422 | ssize_t nb_fields = 0; | |
2423 | ||
2424 | switch (domain) { | |
2425 | case LTTNG_DOMAIN_UST: | |
2426 | nb_fields = ust_app_list_event_fields(fields); | |
2427 | if (nb_fields < 0) { | |
f73fabfd | 2428 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2429 | goto error; |
2430 | } | |
2431 | break; | |
2432 | case LTTNG_DOMAIN_KERNEL: | |
2433 | default: /* fall-through */ | |
f73fabfd | 2434 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2435 | goto error; |
2436 | } | |
2437 | ||
2438 | return nb_fields; | |
2439 | ||
2440 | error: | |
2441 | /* Return negative value to differentiate return code */ | |
2442 | return -ret; | |
2443 | } | |
2444 | ||
834978fd DG |
2445 | ssize_t cmd_list_syscalls(struct lttng_event **events) |
2446 | { | |
2447 | return syscall_table_list(events); | |
2448 | } | |
2449 | ||
a5dfbb9d MD |
2450 | /* |
2451 | * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread. | |
2452 | * | |
2453 | * Called with session lock held. | |
2454 | */ | |
2455 | ssize_t cmd_list_tracker_pids(struct ltt_session *session, | |
56a37563 | 2456 | enum lttng_domain_type domain, int32_t **pids) |
a5dfbb9d MD |
2457 | { |
2458 | int ret; | |
2459 | ssize_t nr_pids = 0; | |
2460 | ||
2461 | switch (domain) { | |
2462 | case LTTNG_DOMAIN_KERNEL: | |
2463 | { | |
2464 | struct ltt_kernel_session *ksess; | |
2465 | ||
2466 | ksess = session->kernel_session; | |
2467 | nr_pids = kernel_list_tracker_pids(ksess, pids); | |
2468 | if (nr_pids < 0) { | |
2469 | ret = LTTNG_ERR_KERN_LIST_FAIL; | |
2470 | goto error; | |
2471 | } | |
2472 | break; | |
2473 | } | |
2474 | case LTTNG_DOMAIN_UST: | |
2475 | { | |
2476 | struct ltt_ust_session *usess; | |
2477 | ||
2478 | usess = session->ust_session; | |
2479 | nr_pids = trace_ust_list_tracker_pids(usess, pids); | |
2480 | if (nr_pids < 0) { | |
2481 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2482 | goto error; | |
2483 | } | |
2484 | break; | |
2485 | } | |
2486 | case LTTNG_DOMAIN_LOG4J: | |
2487 | case LTTNG_DOMAIN_JUL: | |
2488 | case LTTNG_DOMAIN_PYTHON: | |
2489 | default: | |
2490 | ret = LTTNG_ERR_UND; | |
2491 | goto error; | |
2492 | } | |
2493 | ||
2494 | return nr_pids; | |
2495 | ||
2496 | error: | |
2497 | /* Return negative value to differentiate return code */ | |
2498 | return -ret; | |
2499 | } | |
2500 | ||
a1ae2ea5 JD |
2501 | static |
2502 | int domain_mkdir(const struct consumer_output *output, | |
2503 | const struct ltt_session *session, | |
2504 | uid_t uid, gid_t gid) | |
2505 | { | |
2506 | struct consumer_socket *socket; | |
2507 | struct lttng_ht_iter iter; | |
2508 | int ret; | |
2509 | char *path = NULL; | |
2510 | ||
2511 | if (!output || !output->socks) { | |
2512 | ERR("No consumer output found"); | |
2513 | ret = -1; | |
2514 | goto end; | |
2515 | } | |
2516 | ||
2517 | path = zmalloc(LTTNG_PATH_MAX * sizeof(char)); | |
2518 | if (!path) { | |
2519 | ERR("Cannot allocate mkdir path"); | |
2520 | ret = -1; | |
2521 | goto end; | |
2522 | } | |
2523 | ||
2524 | ret = snprintf(path, LTTNG_PATH_MAX, "%s%s%s", | |
2525 | session_get_base_path(session), | |
2526 | output->chunk_path, output->subdir); | |
2527 | if (ret < 0 || ret >= LTTNG_PATH_MAX) { | |
2528 | ERR("Format path"); | |
2529 | ret = -1; | |
2530 | goto end; | |
2531 | } | |
2532 | ||
2533 | DBG("Domain mkdir %s for session %" PRIu64, path, session->id); | |
2534 | rcu_read_lock(); | |
2535 | /* | |
2536 | * We have to iterate to find a socket, but we only need to send the | |
2537 | * rename command to one consumer, so we break after the first one. | |
2538 | */ | |
2539 | cds_lfht_for_each_entry(output->socks->ht, &iter.iter, socket, node.node) { | |
2540 | pthread_mutex_lock(socket->lock); | |
2541 | ret = consumer_mkdir(socket, session->id, output, path, uid, gid); | |
2542 | pthread_mutex_unlock(socket->lock); | |
2543 | if (ret) { | |
2544 | ERR("Consumer mkdir"); | |
2545 | ret = -1; | |
2546 | goto end_unlock; | |
2547 | } | |
2548 | break; | |
2549 | } | |
2550 | ||
2551 | ret = 0; | |
2552 | ||
2553 | end_unlock: | |
2554 | rcu_read_unlock(); | |
2555 | end: | |
2556 | free(path); | |
2557 | return ret; | |
2558 | } | |
2559 | ||
2560 | static | |
2561 | int session_mkdir(const struct ltt_session *session) | |
2562 | { | |
2563 | int ret; | |
2564 | struct consumer_output *output; | |
2565 | uid_t uid; | |
2566 | gid_t gid; | |
2567 | ||
2568 | /* | |
2569 | * Unsupported feature in lttng-relayd before 2.11, not an error since it | |
2570 | * is only needed for session rotation and the user will get an error | |
2571 | * on rotate. | |
2572 | */ | |
2573 | if (session->consumer->type == CONSUMER_DST_NET && | |
2574 | session->consumer->relay_major_version == 2 && | |
2575 | session->consumer->relay_minor_version < 11) { | |
2576 | ret = 0; | |
2577 | goto end; | |
2578 | } | |
2579 | ||
2580 | if (session->kernel_session) { | |
2581 | output = session->kernel_session->consumer; | |
2582 | uid = session->kernel_session->uid; | |
2583 | gid = session->kernel_session->gid; | |
2584 | ret = domain_mkdir(output, session, uid, gid); | |
2585 | if (ret) { | |
2586 | ERR("Mkdir kernel"); | |
2587 | goto end; | |
2588 | } | |
2589 | } | |
2590 | ||
2591 | if (session->ust_session) { | |
2592 | output = session->ust_session->consumer; | |
2593 | uid = session->ust_session->uid; | |
2594 | gid = session->ust_session->gid; | |
2595 | ret = domain_mkdir(output, session, uid, gid); | |
2596 | if (ret) { | |
2597 | ERR("Mkdir UST"); | |
2598 | goto end; | |
2599 | } | |
2600 | } | |
2601 | ||
2602 | ret = 0; | |
2603 | ||
2604 | end: | |
2605 | return ret; | |
2606 | } | |
2607 | ||
2f77fc4b DG |
2608 | /* |
2609 | * Command LTTNG_START_TRACE processed by the client thread. | |
a9ad0c8f MD |
2610 | * |
2611 | * Called with session mutex held. | |
2f77fc4b DG |
2612 | */ |
2613 | int cmd_start_trace(struct ltt_session *session) | |
2614 | { | |
2615 | int ret; | |
cde3e505 | 2616 | unsigned long nb_chan = 0; |
2f77fc4b DG |
2617 | struct ltt_kernel_session *ksession; |
2618 | struct ltt_ust_session *usess; | |
2f77fc4b DG |
2619 | |
2620 | assert(session); | |
2621 | ||
2622 | /* Ease our life a bit ;) */ | |
2623 | ksession = session->kernel_session; | |
2624 | usess = session->ust_session; | |
2625 | ||
8382cf6f DG |
2626 | /* Is the session already started? */ |
2627 | if (session->active) { | |
f73fabfd | 2628 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2629 | goto error; |
2630 | } | |
2631 | ||
cde3e505 DG |
2632 | /* |
2633 | * Starting a session without channel is useless since after that it's not | |
2634 | * possible to enable channel thus inform the client. | |
2635 | */ | |
2636 | if (usess && usess->domain_global.channels) { | |
2637 | nb_chan += lttng_ht_get_count(usess->domain_global.channels); | |
2638 | } | |
2639 | if (ksession) { | |
2640 | nb_chan += ksession->channel_count; | |
2641 | } | |
2642 | if (!nb_chan) { | |
2643 | ret = LTTNG_ERR_NO_CHANNEL; | |
2644 | goto error; | |
2645 | } | |
2646 | ||
5c408ad8 JD |
2647 | /* |
2648 | * Record the timestamp of the first time the session is started for | |
2649 | * an eventual session rotation call. | |
2650 | */ | |
c996624c | 2651 | if (!session->has_been_started) { |
5c408ad8 JD |
2652 | session->current_chunk_start_ts = time(NULL); |
2653 | if (session->current_chunk_start_ts == (time_t) -1) { | |
2654 | PERROR("Failed to retrieve the \"%s\" session's start time", | |
2655 | session->name); | |
2656 | ret = LTTNG_ERR_FATAL; | |
2657 | goto error; | |
2658 | } | |
c996624c JD |
2659 | if (!session->snapshot_mode && session->output_traces) { |
2660 | ret = session_mkdir(session); | |
2661 | if (ret) { | |
2662 | ERR("Failed to create the session directories"); | |
2663 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
2664 | goto error; | |
2665 | } | |
2666 | } | |
2667 | } | |
2668 | ||
2f77fc4b DG |
2669 | /* Kernel tracing */ |
2670 | if (ksession != NULL) { | |
c996624c | 2671 | DBG("Start kernel tracing session %s", session->name); |
9b6c7ec5 DG |
2672 | ret = start_kernel_session(ksession, kernel_tracer_fd); |
2673 | if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2674 | goto error; |
2675 | } | |
2f77fc4b DG |
2676 | } |
2677 | ||
2678 | /* Flag session that trace should start automatically */ | |
2679 | if (usess) { | |
14fb1ebe DG |
2680 | /* |
2681 | * Even though the start trace might fail, flag this session active so | |
2682 | * other application coming in are started by default. | |
2683 | */ | |
2684 | usess->active = 1; | |
2f77fc4b DG |
2685 | |
2686 | ret = ust_app_start_trace_all(usess); | |
2687 | if (ret < 0) { | |
f73fabfd | 2688 | ret = LTTNG_ERR_UST_START_FAIL; |
2f77fc4b DG |
2689 | goto error; |
2690 | } | |
2691 | } | |
2692 | ||
8382cf6f DG |
2693 | /* Flag this after a successful start. */ |
2694 | session->has_been_started = 1; | |
2695 | session->active = 1; | |
9b6c7ec5 | 2696 | |
5c408ad8 JD |
2697 | /* |
2698 | * Clear the flag that indicates that a rotation was done while the | |
2699 | * session was stopped. | |
2700 | */ | |
2701 | session->rotated_after_last_stop = false; | |
2702 | ||
259c2674 JD |
2703 | if (session->rotate_timer_period) { |
2704 | ret = sessiond_rotate_timer_start(session, | |
2705 | session->rotate_timer_period); | |
2706 | if (ret < 0) { | |
2707 | ERR("Failed to enable rotate timer"); | |
2708 | ret = LTTNG_ERR_UNK; | |
2709 | goto error; | |
2710 | } | |
2711 | } | |
2712 | ||
f73fabfd | 2713 | ret = LTTNG_OK; |
2f77fc4b DG |
2714 | |
2715 | error: | |
2716 | return ret; | |
2717 | } | |
2718 | ||
5c408ad8 JD |
2719 | static |
2720 | int rename_active_chunk(struct ltt_session *session) | |
2721 | { | |
2722 | int ret; | |
2723 | ||
ad9f5c17 | 2724 | session->current_archive_id++; |
5c408ad8 JD |
2725 | |
2726 | /* | |
2727 | * The currently active tracing path is now the folder we | |
2728 | * want to rename. | |
2729 | */ | |
2730 | ret = lttng_strncpy(session->rotation_chunk.current_rotate_path, | |
2731 | session->rotation_chunk.active_tracing_path, | |
2732 | sizeof(session->rotation_chunk.current_rotate_path)); | |
2733 | if (ret) { | |
2734 | ERR("Failed to copy active tracing path"); | |
2735 | goto end; | |
2736 | } | |
2737 | ||
2738 | ret = rename_complete_chunk(session, time(NULL)); | |
2739 | if (ret < 0) { | |
2740 | ERR("Failed to rename current rotate path"); | |
2741 | goto end; | |
2742 | } | |
2743 | ||
2744 | /* | |
2745 | * We just renamed, the folder, we didn't do an actual rotation, so | |
2746 | * the active tracing path is now the renamed folder and we have to | |
2747 | * restore the rotate count. | |
2748 | */ | |
2749 | ret = lttng_strncpy(session->rotation_chunk.active_tracing_path, | |
2750 | session->rotation_chunk.current_rotate_path, | |
2751 | sizeof(session->rotation_chunk.active_tracing_path)); | |
2752 | if (ret) { | |
2753 | ERR("Failed to rename active session chunk tracing path"); | |
2754 | goto end; | |
2755 | } | |
2756 | end: | |
ad9f5c17 | 2757 | session->current_archive_id--; |
5c408ad8 JD |
2758 | return ret; |
2759 | } | |
2760 | ||
2f77fc4b DG |
2761 | /* |
2762 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2763 | */ | |
2764 | int cmd_stop_trace(struct ltt_session *session) | |
2765 | { | |
2766 | int ret; | |
2767 | struct ltt_kernel_channel *kchan; | |
2768 | struct ltt_kernel_session *ksession; | |
2769 | struct ltt_ust_session *usess; | |
5c408ad8 | 2770 | bool error_occured = false; |
2f77fc4b DG |
2771 | |
2772 | assert(session); | |
2773 | ||
5c408ad8 | 2774 | DBG("Begin stop session %s (id %" PRIu64 ")", session->name, session->id); |
2f77fc4b DG |
2775 | /* Short cut */ |
2776 | ksession = session->kernel_session; | |
2777 | usess = session->ust_session; | |
2778 | ||
8382cf6f DG |
2779 | /* Session is not active. Skip everythong and inform the client. */ |
2780 | if (!session->active) { | |
f73fabfd | 2781 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
2f77fc4b DG |
2782 | goto error; |
2783 | } | |
2784 | ||
d88744a4 JD |
2785 | if (session->rotate_relay_pending_timer_enabled) { |
2786 | sessiond_timer_rotate_pending_stop(session); | |
2787 | } | |
2788 | ||
259c2674 JD |
2789 | if (session->rotate_timer_enabled) { |
2790 | sessiond_rotate_timer_stop(session); | |
2791 | } | |
2792 | ||
ad9f5c17 | 2793 | if (session->current_archive_id > 0 && !session->rotate_pending) { |
5c408ad8 JD |
2794 | ret = rename_active_chunk(session); |
2795 | if (ret) { | |
2796 | /* | |
2797 | * This error should not prevent the user from stopping | |
2798 | * the session. However, it will be reported at the end. | |
2799 | */ | |
2800 | error_occured = true; | |
2801 | } | |
2802 | } | |
2803 | ||
2f77fc4b | 2804 | /* Kernel tracer */ |
14fb1ebe | 2805 | if (ksession && ksession->active) { |
2f77fc4b DG |
2806 | DBG("Stop kernel tracing"); |
2807 | ||
566d8970 MD |
2808 | ret = kernel_stop_session(ksession); |
2809 | if (ret < 0) { | |
2810 | ret = LTTNG_ERR_KERN_STOP_FAIL; | |
2811 | goto error; | |
2812 | } | |
2813 | ||
2814 | kernel_wait_quiescent(kernel_tracer_fd); | |
2815 | ||
2816 | /* Flush metadata after stopping (if exists) */ | |
2f77fc4b DG |
2817 | if (ksession->metadata_stream_fd >= 0) { |
2818 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2819 | if (ret < 0) { | |
2820 | ERR("Kernel metadata flush failed"); | |
2821 | } | |
2822 | } | |
2823 | ||
566d8970 | 2824 | /* Flush all buffers after stopping */ |
2f77fc4b DG |
2825 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2826 | ret = kernel_flush_buffer(kchan); | |
2827 | if (ret < 0) { | |
2828 | ERR("Kernel flush buffer error"); | |
2829 | } | |
2830 | } | |
2831 | ||
14fb1ebe | 2832 | ksession->active = 0; |
5c408ad8 JD |
2833 | DBG("Kernel session stopped %s (id %" PRIu64 ")", session->name, |
2834 | session->id); | |
2f77fc4b DG |
2835 | } |
2836 | ||
14fb1ebe DG |
2837 | if (usess && usess->active) { |
2838 | /* | |
2839 | * Even though the stop trace might fail, flag this session inactive so | |
2840 | * other application coming in are not started by default. | |
2841 | */ | |
2842 | usess->active = 0; | |
2f77fc4b DG |
2843 | |
2844 | ret = ust_app_stop_trace_all(usess); | |
2845 | if (ret < 0) { | |
f73fabfd | 2846 | ret = LTTNG_ERR_UST_STOP_FAIL; |
2f77fc4b DG |
2847 | goto error; |
2848 | } | |
2849 | } | |
2850 | ||
8382cf6f DG |
2851 | /* Flag inactive after a successful stop. */ |
2852 | session->active = 0; | |
5c408ad8 | 2853 | ret = !error_occured ? LTTNG_OK : LTTNG_ERR_UNK; |
2f77fc4b DG |
2854 | |
2855 | error: | |
2856 | return ret; | |
2857 | } | |
2858 | ||
2859 | /* | |
2860 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
2861 | */ | |
bda32d56 JG |
2862 | int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri, |
2863 | struct lttng_uri *uris) | |
2f77fc4b DG |
2864 | { |
2865 | int ret, i; | |
2866 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2867 | struct ltt_ust_session *usess = session->ust_session; | |
2f77fc4b DG |
2868 | |
2869 | assert(session); | |
2870 | assert(uris); | |
2871 | assert(nb_uri > 0); | |
2872 | ||
8382cf6f DG |
2873 | /* Can't set consumer URI if the session is active. */ |
2874 | if (session->active) { | |
f73fabfd | 2875 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2876 | goto error; |
2877 | } | |
2878 | ||
bda32d56 | 2879 | /* Set the "global" consumer URIs */ |
2f77fc4b | 2880 | for (i = 0; i < nb_uri; i++) { |
bda32d56 JG |
2881 | ret = add_uri_to_consumer(session->consumer, |
2882 | &uris[i], 0, session->name); | |
a74934ba | 2883 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2884 | goto error; |
2885 | } | |
2f77fc4b DG |
2886 | } |
2887 | ||
bda32d56 JG |
2888 | /* Set UST session URIs */ |
2889 | if (session->ust_session) { | |
2890 | for (i = 0; i < nb_uri; i++) { | |
2891 | ret = add_uri_to_consumer( | |
2892 | session->ust_session->consumer, | |
2893 | &uris[i], LTTNG_DOMAIN_UST, | |
2894 | session->name); | |
2895 | if (ret != LTTNG_OK) { | |
2896 | goto error; | |
2897 | } | |
2898 | } | |
2899 | } | |
2900 | ||
2901 | /* Set kernel session URIs */ | |
2902 | if (session->kernel_session) { | |
2903 | for (i = 0; i < nb_uri; i++) { | |
2904 | ret = add_uri_to_consumer( | |
2905 | session->kernel_session->consumer, | |
2906 | &uris[i], LTTNG_DOMAIN_KERNEL, | |
2907 | session->name); | |
2908 | if (ret != LTTNG_OK) { | |
2909 | goto error; | |
2910 | } | |
2911 | } | |
2912 | } | |
2913 | ||
7ab70fe0 DG |
2914 | /* |
2915 | * Make sure to set the session in output mode after we set URI since a | |
2916 | * session can be created without URL (thus flagged in no output mode). | |
2917 | */ | |
2918 | session->output_traces = 1; | |
2919 | if (ksess) { | |
2920 | ksess->output_traces = 1; | |
bda32d56 JG |
2921 | } |
2922 | ||
2923 | if (usess) { | |
7ab70fe0 DG |
2924 | usess->output_traces = 1; |
2925 | } | |
2926 | ||
2f77fc4b | 2927 | /* All good! */ |
f73fabfd | 2928 | ret = LTTNG_OK; |
2f77fc4b DG |
2929 | |
2930 | error: | |
2931 | return ret; | |
2932 | } | |
2933 | ||
2934 | /* | |
2935 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2936 | */ | |
2937 | int cmd_create_session_uri(char *name, struct lttng_uri *uris, | |
ecc48a90 | 2938 | size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer) |
2f77fc4b DG |
2939 | { |
2940 | int ret; | |
2f77fc4b DG |
2941 | struct ltt_session *session; |
2942 | ||
2943 | assert(name); | |
2bba9e53 | 2944 | assert(creds); |
785d2d0d | 2945 | |
2f77fc4b DG |
2946 | /* |
2947 | * Verify if the session already exist | |
2948 | * | |
2949 | * XXX: There is no need for the session lock list here since the caller | |
2950 | * (process_client_msg) is holding it. We might want to change that so a | |
2951 | * single command does not lock the entire session list. | |
2952 | */ | |
2953 | session = session_find_by_name(name); | |
2954 | if (session != NULL) { | |
f73fabfd | 2955 | ret = LTTNG_ERR_EXIST_SESS; |
2f77fc4b DG |
2956 | goto find_error; |
2957 | } | |
2958 | ||
2959 | /* Create tracing session in the registry */ | |
dec56f6c | 2960 | ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds), |
2f77fc4b | 2961 | LTTNG_SOCK_GET_GID_CRED(creds)); |
f73fabfd | 2962 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2963 | goto session_error; |
2964 | } | |
2965 | ||
2966 | /* | |
2967 | * Get the newly created session pointer back | |
2968 | * | |
2969 | * XXX: There is no need for the session lock list here since the caller | |
2970 | * (process_client_msg) is holding it. We might want to change that so a | |
2971 | * single command does not lock the entire session list. | |
2972 | */ | |
2973 | session = session_find_by_name(name); | |
2974 | assert(session); | |
2975 | ||
ecc48a90 | 2976 | session->live_timer = live_timer; |
2f77fc4b DG |
2977 | /* Create default consumer output for the session not yet created. */ |
2978 | session->consumer = consumer_create_output(CONSUMER_DST_LOCAL); | |
2979 | if (session->consumer == NULL) { | |
f73fabfd | 2980 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2981 | goto consumer_error; |
2982 | } | |
2983 | ||
2bba9e53 | 2984 | if (uris) { |
bda32d56 | 2985 | ret = cmd_set_consumer_uri(session, nb_uri, uris); |
2bba9e53 DG |
2986 | if (ret != LTTNG_OK) { |
2987 | goto consumer_error; | |
2988 | } | |
2989 | session->output_traces = 1; | |
2990 | } else { | |
2991 | session->output_traces = 0; | |
2992 | DBG2("Session %s created with no output", session->name); | |
2f77fc4b DG |
2993 | } |
2994 | ||
2995 | session->consumer->enabled = 1; | |
2996 | ||
f73fabfd | 2997 | return LTTNG_OK; |
2f77fc4b DG |
2998 | |
2999 | consumer_error: | |
3000 | session_destroy(session); | |
3001 | session_error: | |
3002 | find_error: | |
3003 | return ret; | |
3004 | } | |
3005 | ||
27babd3a DG |
3006 | /* |
3007 | * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread. | |
3008 | */ | |
3009 | int cmd_create_session_snapshot(char *name, struct lttng_uri *uris, | |
3010 | size_t nb_uri, lttng_sock_cred *creds) | |
3011 | { | |
3012 | int ret; | |
3013 | struct ltt_session *session; | |
3014 | struct snapshot_output *new_output = NULL; | |
3015 | ||
3016 | assert(name); | |
3017 | assert(creds); | |
3018 | ||
3019 | /* | |
3020 | * Create session in no output mode with URIs set to NULL. The uris we've | |
3021 | * received are for a default snapshot output if one. | |
3022 | */ | |
ae58b817 | 3023 | ret = cmd_create_session_uri(name, NULL, 0, creds, 0); |
27babd3a DG |
3024 | if (ret != LTTNG_OK) { |
3025 | goto error; | |
3026 | } | |
3027 | ||
3028 | /* Get the newly created session pointer back. This should NEVER fail. */ | |
3029 | session = session_find_by_name(name); | |
3030 | assert(session); | |
3031 | ||
3032 | /* Flag session for snapshot mode. */ | |
3033 | session->snapshot_mode = 1; | |
3034 | ||
3035 | /* Skip snapshot output creation if no URI is given. */ | |
3036 | if (nb_uri == 0) { | |
3037 | goto end; | |
3038 | } | |
3039 | ||
3040 | new_output = snapshot_output_alloc(); | |
3041 | if (!new_output) { | |
3042 | ret = LTTNG_ERR_NOMEM; | |
3043 | goto error_snapshot_alloc; | |
3044 | } | |
3045 | ||
3046 | ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL, | |
3047 | uris, nb_uri, session->consumer, new_output, &session->snapshot); | |
3048 | if (ret < 0) { | |
3049 | if (ret == -ENOMEM) { | |
3050 | ret = LTTNG_ERR_NOMEM; | |
3051 | } else { | |
3052 | ret = LTTNG_ERR_INVALID; | |
3053 | } | |
3054 | goto error_snapshot; | |
3055 | } | |
3056 | ||
3057 | rcu_read_lock(); | |
3058 | snapshot_add_output(&session->snapshot, new_output); | |
3059 | rcu_read_unlock(); | |
3060 | ||
3061 | end: | |
3062 | return LTTNG_OK; | |
3063 | ||
3064 | error_snapshot: | |
3065 | snapshot_output_destroy(new_output); | |
3066 | error_snapshot_alloc: | |
3067 | session_destroy(session); | |
3068 | error: | |
3069 | return ret; | |
3070 | } | |
3071 | ||
2f77fc4b DG |
3072 | /* |
3073 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
a9ad0c8f MD |
3074 | * |
3075 | * Called with session lock held. | |
2f77fc4b | 3076 | */ |
90936dcf JD |
3077 | int cmd_destroy_session(struct ltt_session *session, int wpipe, |
3078 | struct notification_thread_handle *notification_thread_handle) | |
2f77fc4b DG |
3079 | { |
3080 | int ret; | |
3081 | struct ltt_ust_session *usess; | |
3082 | struct ltt_kernel_session *ksess; | |
3083 | ||
3084 | /* Safety net */ | |
3085 | assert(session); | |
3086 | ||
3087 | usess = session->ust_session; | |
3088 | ksess = session->kernel_session; | |
3089 | ||
5c408ad8 JD |
3090 | DBG("Begin destroy session %s (id %" PRIu64 ")", session->name, session->id); |
3091 | ||
d88744a4 JD |
3092 | if (session->rotate_relay_pending_timer_enabled) { |
3093 | sessiond_timer_rotate_pending_stop(session); | |
3094 | } | |
3095 | ||
259c2674 JD |
3096 | if (session->rotate_timer_enabled) { |
3097 | sessiond_rotate_timer_stop(session); | |
3098 | } | |
3099 | ||
90936dcf JD |
3100 | if (session->rotate_size) { |
3101 | unsubscribe_session_consumed_size_rotation(session, notification_thread_handle); | |
3102 | session->rotate_size = 0; | |
3103 | } | |
3104 | ||
5c408ad8 JD |
3105 | /* |
3106 | * The rename of the current chunk is performed at stop, but if we rotated | |
3107 | * the session after the previous stop command, we need to rename the | |
3108 | * new (and empty) chunk that was started in between. | |
3109 | */ | |
3110 | if (session->rotated_after_last_stop) { | |
3111 | rename_active_chunk(session); | |
3112 | } | |
3113 | ||
2f77fc4b DG |
3114 | /* Clean kernel session teardown */ |
3115 | kernel_destroy_session(ksess); | |
3116 | ||
3117 | /* UST session teardown */ | |
3118 | if (usess) { | |
3119 | /* Close any relayd session */ | |
3120 | consumer_output_send_destroy_relayd(usess->consumer); | |
3121 | ||
3122 | /* Destroy every UST application related to this session. */ | |
3123 | ret = ust_app_destroy_trace_all(usess); | |
3124 | if (ret) { | |
3125 | ERR("Error in ust_app_destroy_trace_all"); | |
3126 | } | |
3127 | ||
3128 | /* Clean up the rest. */ | |
3129 | trace_ust_destroy_session(usess); | |
3130 | } | |
3131 | ||
3132 | /* | |
3133 | * Must notify the kernel thread here to update it's poll set in order to | |
3134 | * remove the channel(s)' fd just destroyed. | |
3135 | */ | |
3136 | ret = notify_thread_pipe(wpipe); | |
3137 | if (ret < 0) { | |
3138 | PERROR("write kernel poll pipe"); | |
3139 | } | |
3140 | ||
a503e1ef JG |
3141 | if (session->shm_path[0]) { |
3142 | /* | |
3143 | * When a session is created with an explicit shm_path, | |
3144 | * the consumer daemon will create its shared memory files | |
3145 | * at that location and will *not* unlink them. This is normal | |
3146 | * as the intention of that feature is to make it possible | |
3147 | * to retrieve the content of those files should a crash occur. | |
3148 | * | |
3149 | * To ensure the content of those files can be used, the | |
3150 | * sessiond daemon will replicate the content of the metadata | |
3151 | * cache in a metadata file. | |
3152 | * | |
3153 | * On clean-up, it is expected that the consumer daemon will | |
3154 | * unlink the shared memory files and that the session daemon | |
3155 | * will unlink the metadata file. Then, the session's directory | |
3156 | * in the shm path can be removed. | |
3157 | * | |
3158 | * Unfortunately, a flaw in the design of the sessiond's and | |
3159 | * consumerd's tear down of channels makes it impossible to | |
3160 | * determine when the sessiond _and_ the consumerd have both | |
3161 | * destroyed their representation of a channel. For one, the | |
3162 | * unlinking, close, and rmdir happen in deferred 'call_rcu' | |
3163 | * callbacks in both daemons. | |
3164 | * | |
3165 | * However, it is also impossible for the sessiond to know when | |
3166 | * the consumer daemon is done destroying its channel(s) since | |
3167 | * it occurs as a reaction to the closing of the channel's file | |
3168 | * descriptor. There is no resulting communication initiated | |
3169 | * from the consumerd to the sessiond to confirm that the | |
3170 | * operation is completed (and was successful). | |
3171 | * | |
3172 | * Until this is all fixed, the session daemon checks for the | |
3173 | * removal of the session's shm path which makes it possible | |
3174 | * to safely advertise a session as having been destroyed. | |
3175 | * | |
3176 | * Prior to this fix, it was not possible to reliably save | |
3177 | * a session making use of the --shm-path option, destroy it, | |
3178 | * and load it again. This is because the creation of the | |
3179 | * session would fail upon seeing the session's shm path | |
3180 | * already in existence. | |
3181 | * | |
3182 | * Note that none of the error paths in the check for the | |
3183 | * directory's existence return an error. This is normal | |
3184 | * as there isn't much that can be done. The session will | |
3185 | * be destroyed properly, except that we can't offer the | |
3186 | * guarantee that the same session can be re-created. | |
3187 | */ | |
3188 | current_completion_handler = &destroy_completion_handler.handler; | |
3189 | ret = lttng_strncpy(destroy_completion_handler.shm_path, | |
3190 | session->shm_path, | |
3191 | sizeof(destroy_completion_handler.shm_path)); | |
3192 | assert(!ret); | |
3193 | } | |
2f77fc4b DG |
3194 | ret = session_destroy(session); |
3195 | ||
3196 | return ret; | |
3197 | } | |
3198 | ||
2f77fc4b DG |
3199 | /* |
3200 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
3201 | */ | |
56a37563 JG |
3202 | int cmd_register_consumer(struct ltt_session *session, |
3203 | enum lttng_domain_type domain, const char *sock_path, | |
3204 | struct consumer_data *cdata) | |
2f77fc4b DG |
3205 | { |
3206 | int ret, sock; | |
dd81b457 | 3207 | struct consumer_socket *socket = NULL; |
2f77fc4b DG |
3208 | |
3209 | assert(session); | |
3210 | assert(cdata); | |
3211 | assert(sock_path); | |
3212 | ||
3213 | switch (domain) { | |
3214 | case LTTNG_DOMAIN_KERNEL: | |
3215 | { | |
3216 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3217 | ||
3218 | assert(ksess); | |
3219 | ||
3220 | /* Can't register a consumer if there is already one */ | |
3221 | if (ksess->consumer_fds_sent != 0) { | |
f73fabfd | 3222 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
3223 | goto error; |
3224 | } | |
3225 | ||
3226 | sock = lttcomm_connect_unix_sock(sock_path); | |
3227 | if (sock < 0) { | |
f73fabfd | 3228 | ret = LTTNG_ERR_CONNECT_FAIL; |
2f77fc4b DG |
3229 | goto error; |
3230 | } | |
4ce514c4 | 3231 | cdata->cmd_sock = sock; |
2f77fc4b | 3232 | |
4ce514c4 | 3233 | socket = consumer_allocate_socket(&cdata->cmd_sock); |
2f77fc4b | 3234 | if (socket == NULL) { |
f66c074c DG |
3235 | ret = close(sock); |
3236 | if (ret < 0) { | |
3237 | PERROR("close register consumer"); | |
3238 | } | |
4ce514c4 | 3239 | cdata->cmd_sock = -1; |
f73fabfd | 3240 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
3241 | goto error; |
3242 | } | |
3243 | ||
3244 | socket->lock = zmalloc(sizeof(pthread_mutex_t)); | |
3245 | if (socket->lock == NULL) { | |
3246 | PERROR("zmalloc pthread mutex"); | |
f73fabfd | 3247 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
3248 | goto error; |
3249 | } | |
3250 | pthread_mutex_init(socket->lock, NULL); | |
3251 | socket->registered = 1; | |
3252 | ||
3253 | rcu_read_lock(); | |
3254 | consumer_add_socket(socket, ksess->consumer); | |
3255 | rcu_read_unlock(); | |
3256 | ||
3257 | pthread_mutex_lock(&cdata->pid_mutex); | |
3258 | cdata->pid = -1; | |
3259 | pthread_mutex_unlock(&cdata->pid_mutex); | |
3260 | ||
3261 | break; | |
3262 | } | |
3263 | default: | |
3264 | /* TODO: Userspace tracing */ | |
f73fabfd | 3265 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3266 | goto error; |
3267 | } | |
3268 | ||
dd81b457 | 3269 | return LTTNG_OK; |
2f77fc4b DG |
3270 | |
3271 | error: | |
dd81b457 DG |
3272 | if (socket) { |
3273 | consumer_destroy_socket(socket); | |
3274 | } | |
2f77fc4b DG |
3275 | return ret; |
3276 | } | |
3277 | ||
3278 | /* | |
3279 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
3280 | */ | |
3281 | ssize_t cmd_list_domains(struct ltt_session *session, | |
3282 | struct lttng_domain **domains) | |
3283 | { | |
3284 | int ret, index = 0; | |
3285 | ssize_t nb_dom = 0; | |
fefd409b DG |
3286 | struct agent *agt; |
3287 | struct lttng_ht_iter iter; | |
2f77fc4b DG |
3288 | |
3289 | if (session->kernel_session != NULL) { | |
3290 | DBG3("Listing domains found kernel domain"); | |
3291 | nb_dom++; | |
3292 | } | |
3293 | ||
3294 | if (session->ust_session != NULL) { | |
3295 | DBG3("Listing domains found UST global domain"); | |
3296 | nb_dom++; | |
3c6a091f | 3297 | |
e0a74f01 | 3298 | rcu_read_lock(); |
fefd409b DG |
3299 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
3300 | agt, node.node) { | |
3301 | if (agt->being_used) { | |
3302 | nb_dom++; | |
3303 | } | |
3c6a091f | 3304 | } |
e0a74f01 | 3305 | rcu_read_unlock(); |
2f77fc4b DG |
3306 | } |
3307 | ||
fa64dfb4 JG |
3308 | if (!nb_dom) { |
3309 | goto end; | |
3310 | } | |
3311 | ||
2f77fc4b DG |
3312 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
3313 | if (*domains == NULL) { | |
f73fabfd | 3314 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
3315 | goto error; |
3316 | } | |
3317 | ||
3318 | if (session->kernel_session != NULL) { | |
3319 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
b5edb9e8 PP |
3320 | |
3321 | /* Kernel session buffer type is always GLOBAL */ | |
3322 | (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL; | |
3323 | ||
2f77fc4b DG |
3324 | index++; |
3325 | } | |
3326 | ||
3327 | if (session->ust_session != NULL) { | |
3328 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
88c5f0d8 | 3329 | (*domains)[index].buf_type = session->ust_session->buffer_type; |
2f77fc4b | 3330 | index++; |
3c6a091f | 3331 | |
e0a74f01 | 3332 | rcu_read_lock(); |
fefd409b DG |
3333 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
3334 | agt, node.node) { | |
3335 | if (agt->being_used) { | |
3336 | (*domains)[index].type = agt->domain; | |
3337 | (*domains)[index].buf_type = session->ust_session->buffer_type; | |
3338 | index++; | |
3339 | } | |
3c6a091f | 3340 | } |
e0a74f01 | 3341 | rcu_read_unlock(); |
2f77fc4b | 3342 | } |
fa64dfb4 | 3343 | end: |
2f77fc4b DG |
3344 | return nb_dom; |
3345 | ||
3346 | error: | |
f73fabfd DG |
3347 | /* Return negative value to differentiate return code */ |
3348 | return -ret; | |
2f77fc4b DG |
3349 | } |
3350 | ||
3351 | ||
3352 | /* | |
3353 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
3354 | */ | |
56a37563 JG |
3355 | ssize_t cmd_list_channels(enum lttng_domain_type domain, |
3356 | struct ltt_session *session, struct lttng_channel **channels) | |
2f77fc4b | 3357 | { |
53e367f9 | 3358 | ssize_t nb_chan = 0, payload_size = 0, ret; |
2f77fc4b DG |
3359 | |
3360 | switch (domain) { | |
3361 | case LTTNG_DOMAIN_KERNEL: | |
3362 | if (session->kernel_session != NULL) { | |
3363 | nb_chan = session->kernel_session->channel_count; | |
3364 | } | |
3365 | DBG3("Number of kernel channels %zd", nb_chan); | |
c7d620a2 | 3366 | if (nb_chan <= 0) { |
53e367f9 JG |
3367 | ret = -LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
3368 | goto end; | |
c7d620a2 | 3369 | } |
2f77fc4b DG |
3370 | break; |
3371 | case LTTNG_DOMAIN_UST: | |
3372 | if (session->ust_session != NULL) { | |
7ffc31a2 | 3373 | rcu_read_lock(); |
2f77fc4b | 3374 | nb_chan = lttng_ht_get_count( |
7ffc31a2 JG |
3375 | session->ust_session->domain_global.channels); |
3376 | rcu_read_unlock(); | |
2f77fc4b DG |
3377 | } |
3378 | DBG3("Number of UST global channels %zd", nb_chan); | |
ade7ce52 | 3379 | if (nb_chan < 0) { |
53e367f9 JG |
3380 | ret = -LTTNG_ERR_UST_CHAN_NOT_FOUND; |
3381 | goto end; | |
c7d620a2 | 3382 | } |
2f77fc4b DG |
3383 | break; |
3384 | default: | |
53e367f9 JG |
3385 | ret = -LTTNG_ERR_UND; |
3386 | goto end; | |
2f77fc4b DG |
3387 | } |
3388 | ||
3389 | if (nb_chan > 0) { | |
53e367f9 | 3390 | const size_t channel_size = sizeof(struct lttng_channel) + |
cf0bcb51 JG |
3391 | sizeof(struct lttng_channel_extended); |
3392 | struct lttng_channel_extended *channel_exts; | |
53e367f9 JG |
3393 | |
3394 | payload_size = nb_chan * channel_size; | |
3395 | *channels = zmalloc(payload_size); | |
2f77fc4b | 3396 | if (*channels == NULL) { |
53e367f9 JG |
3397 | ret = -LTTNG_ERR_FATAL; |
3398 | goto end; | |
2f77fc4b DG |
3399 | } |
3400 | ||
53e367f9 JG |
3401 | channel_exts = ((void *) *channels) + |
3402 | (nb_chan * sizeof(struct lttng_channel)); | |
d449df4a MD |
3403 | ret = list_lttng_channels(domain, session, *channels, channel_exts); |
3404 | if (ret != LTTNG_OK) { | |
3405 | free(*channels); | |
3406 | *channels = NULL; | |
3407 | goto end; | |
3408 | } | |
53e367f9 JG |
3409 | } else { |
3410 | *channels = NULL; | |
2f77fc4b DG |
3411 | } |
3412 | ||
53e367f9 JG |
3413 | ret = payload_size; |
3414 | end: | |
3415 | return ret; | |
2f77fc4b DG |
3416 | } |
3417 | ||
3418 | /* | |
3419 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3420 | */ | |
56a37563 JG |
3421 | ssize_t cmd_list_events(enum lttng_domain_type domain, |
3422 | struct ltt_session *session, char *channel_name, | |
b4e3ceb9 | 3423 | struct lttng_event **events, size_t *total_size) |
2f77fc4b DG |
3424 | { |
3425 | int ret = 0; | |
3426 | ssize_t nb_event = 0; | |
3427 | ||
3428 | switch (domain) { | |
3429 | case LTTNG_DOMAIN_KERNEL: | |
3430 | if (session->kernel_session != NULL) { | |
3431 | nb_event = list_lttng_kernel_events(channel_name, | |
b4e3ceb9 PP |
3432 | session->kernel_session, events, |
3433 | total_size); | |
2f77fc4b DG |
3434 | } |
3435 | break; | |
3436 | case LTTNG_DOMAIN_UST: | |
3437 | { | |
3438 | if (session->ust_session != NULL) { | |
3439 | nb_event = list_lttng_ust_global_events(channel_name, | |
b4e3ceb9 PP |
3440 | &session->ust_session->domain_global, events, |
3441 | total_size); | |
2f77fc4b DG |
3442 | } |
3443 | break; | |
3444 | } | |
5cdb6027 | 3445 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 3446 | case LTTNG_DOMAIN_JUL: |
0e115563 | 3447 | case LTTNG_DOMAIN_PYTHON: |
3c6a091f | 3448 | if (session->ust_session) { |
fefd409b DG |
3449 | struct lttng_ht_iter iter; |
3450 | struct agent *agt; | |
3451 | ||
b11feea5 | 3452 | rcu_read_lock(); |
fefd409b DG |
3453 | cds_lfht_for_each_entry(session->ust_session->agents->ht, |
3454 | &iter.iter, agt, node.node) { | |
1dfd9906 JG |
3455 | if (agt->domain == domain) { |
3456 | nb_event = list_lttng_agent_events( | |
b4e3ceb9 PP |
3457 | agt, events, |
3458 | total_size); | |
1dfd9906 JG |
3459 | break; |
3460 | } | |
fefd409b | 3461 | } |
b11feea5 | 3462 | rcu_read_unlock(); |
3c6a091f DG |
3463 | } |
3464 | break; | |
2f77fc4b | 3465 | default: |
f73fabfd | 3466 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3467 | goto error; |
3468 | } | |
3469 | ||
f73fabfd | 3470 | return nb_event; |
2f77fc4b DG |
3471 | |
3472 | error: | |
f73fabfd DG |
3473 | /* Return negative value to differentiate return code */ |
3474 | return -ret; | |
2f77fc4b DG |
3475 | } |
3476 | ||
3477 | /* | |
3478 | * Using the session list, filled a lttng_session array to send back to the | |
3479 | * client for session listing. | |
3480 | * | |
3481 | * The session list lock MUST be acquired before calling this function. Use | |
3482 | * session_lock_list() and session_unlock_list(). | |
3483 | */ | |
3484 | void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid, | |
3485 | gid_t gid) | |
3486 | { | |
3487 | int ret; | |
3488 | unsigned int i = 0; | |
3489 | struct ltt_session *session; | |
3490 | struct ltt_session_list *list = session_get_list(); | |
3491 | ||
3492 | DBG("Getting all available session for UID %d GID %d", | |
3493 | uid, gid); | |
3494 | /* | |
3495 | * Iterate over session list and append data after the control struct in | |
3496 | * the buffer. | |
3497 | */ | |
3498 | cds_list_for_each_entry(session, &list->head, list) { | |
3499 | /* | |
3500 | * Only list the sessions the user can control. | |
3501 | */ | |
3502 | if (!session_access_ok(session, uid, gid)) { | |
3503 | continue; | |
3504 | } | |
3505 | ||
3506 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3507 | struct ltt_ust_session *usess = session->ust_session; | |
3508 | ||
3509 | if (session->consumer->type == CONSUMER_DST_NET || | |
3510 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
3511 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
3512 | ret = build_network_session_path(sessions[i].path, | |
dec56f6c | 3513 | sizeof(sessions[i].path), session); |
2f77fc4b | 3514 | } else { |
dec56f6c | 3515 | ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s", |
366a9222 | 3516 | session->consumer->dst.session_root_path); |
2f77fc4b DG |
3517 | } |
3518 | if (ret < 0) { | |
3519 | PERROR("snprintf session path"); | |
3520 | continue; | |
3521 | } | |
3522 | ||
3523 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
3524 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
8382cf6f | 3525 | sessions[i].enabled = session->active; |
2cbf8fed | 3526 | sessions[i].snapshot_mode = session->snapshot_mode; |
8960e9cd | 3527 | sessions[i].live_timer_interval = session->live_timer; |
2f77fc4b DG |
3528 | i++; |
3529 | } | |
3530 | } | |
3531 | ||
806e2684 | 3532 | /* |
6d805429 | 3533 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
d3f14b8a | 3534 | * ready for trace analysis (or any kind of reader) or else 1 for pending data. |
806e2684 | 3535 | */ |
6d805429 | 3536 | int cmd_data_pending(struct ltt_session *session) |
806e2684 DG |
3537 | { |
3538 | int ret; | |
3539 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3540 | struct ltt_ust_session *usess = session->ust_session; | |
3541 | ||
3542 | assert(session); | |
3543 | ||
5c408ad8 JD |
3544 | DBG("Data pending for session %s", session->name); |
3545 | ||
806e2684 | 3546 | /* Session MUST be stopped to ask for data availability. */ |
8382cf6f | 3547 | if (session->active) { |
806e2684 DG |
3548 | ret = LTTNG_ERR_SESSION_STARTED; |
3549 | goto error; | |
3a89d11a DG |
3550 | } else { |
3551 | /* | |
3552 | * If stopped, just make sure we've started before else the above call | |
3553 | * will always send that there is data pending. | |
3554 | * | |
3555 | * The consumer assumes that when the data pending command is received, | |
3556 | * the trace has been started before or else no output data is written | |
3557 | * by the streams which is a condition for data pending. So, this is | |
3558 | * *VERY* important that we don't ask the consumer before a start | |
3559 | * trace. | |
3560 | */ | |
8382cf6f | 3561 | if (!session->has_been_started) { |
3a89d11a DG |
3562 | ret = 0; |
3563 | goto error; | |
3564 | } | |
806e2684 DG |
3565 | } |
3566 | ||
5c408ad8 JD |
3567 | /* |
3568 | * A rotation is still pending, we have to wait. | |
3569 | */ | |
3570 | if (session->rotate_pending) { | |
3571 | DBG("Rotate still pending for session %s", session->name); | |
3572 | ret = 1; | |
3573 | goto error; | |
3574 | } | |
3575 | ||
806e2684 | 3576 | if (ksess && ksess->consumer) { |
6d805429 DG |
3577 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
3578 | if (ret == 1) { | |
806e2684 DG |
3579 | /* Data is still being extracted for the kernel. */ |
3580 | goto error; | |
3581 | } | |
3582 | } | |
3583 | ||
3584 | if (usess && usess->consumer) { | |
6d805429 DG |
3585 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
3586 | if (ret == 1) { | |
806e2684 DG |
3587 | /* Data is still being extracted for the kernel. */ |
3588 | goto error; | |
3589 | } | |
3590 | } | |
3591 | ||
3592 | /* Data is ready to be read by a viewer */ | |
6d805429 | 3593 | ret = 0; |
806e2684 DG |
3594 | |
3595 | error: | |
3596 | return ret; | |
3597 | } | |
3598 | ||
6dc3064a DG |
3599 | /* |
3600 | * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library. | |
3601 | * | |
3602 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3603 | */ | |
3604 | int cmd_snapshot_add_output(struct ltt_session *session, | |
3605 | struct lttng_snapshot_output *output, uint32_t *id) | |
3606 | { | |
3607 | int ret; | |
3608 | struct snapshot_output *new_output; | |
3609 | ||
3610 | assert(session); | |
3611 | assert(output); | |
3612 | ||
3613 | DBG("Cmd snapshot add output for session %s", session->name); | |
3614 | ||
3615 | /* | |
903ef685 | 3616 | * Can't create an output if the session is not set in no-output mode. |
6dc3064a DG |
3617 | */ |
3618 | if (session->output_traces) { | |
903ef685 | 3619 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3620 | goto error; |
3621 | } | |
3622 | ||
3623 | /* Only one output is allowed until we have the "tee" feature. */ | |
3624 | if (session->snapshot.nb_output == 1) { | |
3625 | ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST; | |
3626 | goto error; | |
3627 | } | |
3628 | ||
3629 | new_output = snapshot_output_alloc(); | |
3630 | if (!new_output) { | |
3631 | ret = LTTNG_ERR_NOMEM; | |
3632 | goto error; | |
3633 | } | |
3634 | ||
3635 | ret = snapshot_output_init(output->max_size, output->name, | |
3636 | output->ctrl_url, output->data_url, session->consumer, new_output, | |
3637 | &session->snapshot); | |
3638 | if (ret < 0) { | |
3639 | if (ret == -ENOMEM) { | |
3640 | ret = LTTNG_ERR_NOMEM; | |
3641 | } else { | |
3642 | ret = LTTNG_ERR_INVALID; | |
3643 | } | |
3644 | goto free_error; | |
3645 | } | |
3646 | ||
6dc3064a DG |
3647 | rcu_read_lock(); |
3648 | snapshot_add_output(&session->snapshot, new_output); | |
3649 | if (id) { | |
3650 | *id = new_output->id; | |
3651 | } | |
3652 | rcu_read_unlock(); | |
3653 | ||
3654 | return LTTNG_OK; | |
3655 | ||
3656 | free_error: | |
3657 | snapshot_output_destroy(new_output); | |
3658 | error: | |
3659 | return ret; | |
3660 | } | |
3661 | ||
3662 | /* | |
3663 | * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl. | |
3664 | * | |
3665 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3666 | */ | |
3667 | int cmd_snapshot_del_output(struct ltt_session *session, | |
3668 | struct lttng_snapshot_output *output) | |
3669 | { | |
3670 | int ret; | |
eb240553 | 3671 | struct snapshot_output *sout = NULL; |
6dc3064a DG |
3672 | |
3673 | assert(session); | |
3674 | assert(output); | |
3675 | ||
6dc3064a DG |
3676 | rcu_read_lock(); |
3677 | ||
3678 | /* | |
d3f14b8a MD |
3679 | * Permission denied to create an output if the session is not |
3680 | * set in no output mode. | |
6dc3064a DG |
3681 | */ |
3682 | if (session->output_traces) { | |
903ef685 | 3683 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3684 | goto error; |
3685 | } | |
3686 | ||
eb240553 DG |
3687 | if (output->id) { |
3688 | DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id, | |
3689 | session->name); | |
3690 | sout = snapshot_find_output_by_id(output->id, &session->snapshot); | |
3691 | } else if (*output->name != '\0') { | |
3692 | DBG("Cmd snapshot del output name %s for session %s", output->name, | |
3693 | session->name); | |
3694 | sout = snapshot_find_output_by_name(output->name, &session->snapshot); | |
3695 | } | |
6dc3064a DG |
3696 | if (!sout) { |
3697 | ret = LTTNG_ERR_INVALID; | |
3698 | goto error; | |
3699 | } | |
3700 | ||
3701 | snapshot_delete_output(&session->snapshot, sout); | |
3702 | snapshot_output_destroy(sout); | |
3703 | ret = LTTNG_OK; | |
3704 | ||
3705 | error: | |
3706 | rcu_read_unlock(); | |
3707 | return ret; | |
3708 | } | |
3709 | ||
3710 | /* | |
3711 | * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl. | |
3712 | * | |
3713 | * If no output is available, outputs is untouched and 0 is returned. | |
3714 | * | |
3715 | * Return the size of the newly allocated outputs or a negative LTTNG_ERR code. | |
3716 | */ | |
3717 | ssize_t cmd_snapshot_list_outputs(struct ltt_session *session, | |
3718 | struct lttng_snapshot_output **outputs) | |
3719 | { | |
3720 | int ret, idx = 0; | |
b223ca94 | 3721 | struct lttng_snapshot_output *list = NULL; |
6dc3064a DG |
3722 | struct lttng_ht_iter iter; |
3723 | struct snapshot_output *output; | |
3724 | ||
3725 | assert(session); | |
3726 | assert(outputs); | |
3727 | ||
3728 | DBG("Cmd snapshot list outputs for session %s", session->name); | |
3729 | ||
3730 | /* | |
d3f14b8a MD |
3731 | * Permission denied to create an output if the session is not |
3732 | * set in no output mode. | |
6dc3064a DG |
3733 | */ |
3734 | if (session->output_traces) { | |
903ef685 JG |
3735 | ret = -LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
3736 | goto end; | |
6dc3064a DG |
3737 | } |
3738 | ||
3739 | if (session->snapshot.nb_output == 0) { | |
3740 | ret = 0; | |
903ef685 | 3741 | goto end; |
6dc3064a DG |
3742 | } |
3743 | ||
3744 | list = zmalloc(session->snapshot.nb_output * sizeof(*list)); | |
3745 | if (!list) { | |
b223ca94 | 3746 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3747 | goto end; |
6dc3064a DG |
3748 | } |
3749 | ||
3750 | /* Copy list from session to the new list object. */ | |
b223ca94 | 3751 | rcu_read_lock(); |
6dc3064a DG |
3752 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter, |
3753 | output, node.node) { | |
3754 | assert(output->consumer); | |
3755 | list[idx].id = output->id; | |
3756 | list[idx].max_size = output->max_size; | |
6ce22875 MD |
3757 | if (lttng_strncpy(list[idx].name, output->name, |
3758 | sizeof(list[idx].name))) { | |
3759 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 3760 | goto error; |
6ce22875 | 3761 | } |
6dc3064a | 3762 | if (output->consumer->type == CONSUMER_DST_LOCAL) { |
6ce22875 | 3763 | if (lttng_strncpy(list[idx].ctrl_url, |
366a9222 | 3764 | output->consumer->dst.session_root_path, |
6ce22875 MD |
3765 | sizeof(list[idx].ctrl_url))) { |
3766 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 3767 | goto error; |
6ce22875 | 3768 | } |
6dc3064a DG |
3769 | } else { |
3770 | /* Control URI. */ | |
3771 | ret = uri_to_str_url(&output->consumer->dst.net.control, | |
3772 | list[idx].ctrl_url, sizeof(list[idx].ctrl_url)); | |
3773 | if (ret < 0) { | |
b223ca94 | 3774 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3775 | goto error; |
6dc3064a DG |
3776 | } |
3777 | ||
3778 | /* Data URI. */ | |
3779 | ret = uri_to_str_url(&output->consumer->dst.net.data, | |
3780 | list[idx].data_url, sizeof(list[idx].data_url)); | |
3781 | if (ret < 0) { | |
b223ca94 | 3782 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3783 | goto error; |
6dc3064a DG |
3784 | } |
3785 | } | |
3786 | idx++; | |
3787 | } | |
3788 | ||
3789 | *outputs = list; | |
b223ca94 JG |
3790 | list = NULL; |
3791 | ret = session->snapshot.nb_output; | |
6dc3064a | 3792 | error: |
903ef685 | 3793 | rcu_read_unlock(); |
b223ca94 | 3794 | free(list); |
903ef685 | 3795 | end: |
b223ca94 | 3796 | return ret; |
6dc3064a DG |
3797 | } |
3798 | ||
93ec662e JD |
3799 | /* |
3800 | * Check if we can regenerate the metadata for this session. | |
3801 | * Only kernel, UST per-uid and non-live sessions are supported. | |
3802 | * | |
3803 | * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise. | |
3804 | */ | |
3805 | static | |
eded6438 | 3806 | int check_regenerate_metadata_support(struct ltt_session *session) |
93ec662e JD |
3807 | { |
3808 | int ret; | |
3809 | ||
3810 | assert(session); | |
3811 | ||
3812 | if (session->live_timer != 0) { | |
3813 | ret = LTTNG_ERR_LIVE_SESSION; | |
3814 | goto end; | |
3815 | } | |
3816 | if (!session->active) { | |
3817 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
3818 | goto end; | |
3819 | } | |
3820 | if (session->ust_session) { | |
3821 | switch (session->ust_session->buffer_type) { | |
3822 | case LTTNG_BUFFER_PER_UID: | |
3823 | break; | |
3824 | case LTTNG_BUFFER_PER_PID: | |
3825 | ret = LTTNG_ERR_PER_PID_SESSION; | |
3826 | goto end; | |
3827 | default: | |
3828 | assert(0); | |
3829 | ret = LTTNG_ERR_UNK; | |
3830 | goto end; | |
3831 | } | |
3832 | } | |
3833 | if (session->consumer->type == CONSUMER_DST_NET && | |
3834 | session->consumer->relay_minor_version < 8) { | |
3835 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; | |
3836 | goto end; | |
3837 | } | |
3838 | ret = 0; | |
3839 | ||
3840 | end: | |
3841 | return ret; | |
3842 | } | |
3843 | ||
7802bae3 LL |
3844 | static |
3845 | int clear_metadata_file(int fd) | |
3846 | { | |
3847 | int ret; | |
a5df8828 | 3848 | off_t lseek_ret; |
7802bae3 | 3849 | |
a5df8828 GL |
3850 | lseek_ret = lseek(fd, 0, SEEK_SET); |
3851 | if (lseek_ret < 0) { | |
7802bae3 | 3852 | PERROR("lseek"); |
a5df8828 | 3853 | ret = -1; |
7802bae3 LL |
3854 | goto end; |
3855 | } | |
3856 | ||
3857 | ret = ftruncate(fd, 0); | |
3858 | if (ret < 0) { | |
3859 | PERROR("ftruncate"); | |
3860 | goto end; | |
3861 | } | |
3862 | ||
3863 | end: | |
3864 | return ret; | |
3865 | } | |
3866 | ||
93ec662e | 3867 | static |
eded6438 | 3868 | int ust_regenerate_metadata(struct ltt_ust_session *usess) |
93ec662e JD |
3869 | { |
3870 | int ret = 0; | |
3871 | struct buffer_reg_uid *uid_reg = NULL; | |
3872 | struct buffer_reg_session *session_reg = NULL; | |
3873 | ||
3874 | rcu_read_lock(); | |
3875 | cds_list_for_each_entry(uid_reg, &usess->buffer_reg_uid_list, lnode) { | |
3876 | struct ust_registry_session *registry; | |
3877 | struct ust_registry_channel *chan; | |
3878 | struct lttng_ht_iter iter_chan; | |
3879 | ||
3880 | session_reg = uid_reg->registry; | |
3881 | registry = session_reg->reg.ust; | |
3882 | ||
3883 | pthread_mutex_lock(®istry->lock); | |
3884 | registry->metadata_len_sent = 0; | |
3885 | memset(registry->metadata, 0, registry->metadata_alloc_len); | |
3886 | registry->metadata_len = 0; | |
3887 | registry->metadata_version++; | |
7802bae3 LL |
3888 | if (registry->metadata_fd > 0) { |
3889 | /* Clear the metadata file's content. */ | |
3890 | ret = clear_metadata_file(registry->metadata_fd); | |
3891 | if (ret) { | |
3892 | pthread_mutex_unlock(®istry->lock); | |
3893 | goto end; | |
3894 | } | |
3895 | } | |
3896 | ||
93ec662e JD |
3897 | ret = ust_metadata_session_statedump(registry, NULL, |
3898 | registry->major, registry->minor); | |
3899 | if (ret) { | |
3900 | pthread_mutex_unlock(®istry->lock); | |
3901 | ERR("Failed to generate session metadata (err = %d)", | |
3902 | ret); | |
3903 | goto end; | |
3904 | } | |
3905 | cds_lfht_for_each_entry(registry->channels->ht, &iter_chan.iter, | |
3906 | chan, node.node) { | |
3907 | struct ust_registry_event *event; | |
3908 | struct lttng_ht_iter iter_event; | |
3909 | ||
3910 | ret = ust_metadata_channel_statedump(registry, chan); | |
3911 | if (ret) { | |
3912 | pthread_mutex_unlock(®istry->lock); | |
3913 | ERR("Failed to generate channel metadata " | |
3914 | "(err = %d)", ret); | |
3915 | goto end; | |
3916 | } | |
3917 | cds_lfht_for_each_entry(chan->ht->ht, &iter_event.iter, | |
3918 | event, node.node) { | |
3919 | ret = ust_metadata_event_statedump(registry, | |
3920 | chan, event); | |
3921 | if (ret) { | |
3922 | pthread_mutex_unlock(®istry->lock); | |
3923 | ERR("Failed to generate event metadata " | |
3924 | "(err = %d)", ret); | |
3925 | goto end; | |
3926 | } | |
3927 | } | |
3928 | } | |
3929 | pthread_mutex_unlock(®istry->lock); | |
3930 | } | |
3931 | ||
3932 | end: | |
3933 | rcu_read_unlock(); | |
3934 | return ret; | |
3935 | } | |
3936 | ||
3937 | /* | |
eded6438 | 3938 | * Command LTTNG_REGENERATE_METADATA from the lttng-ctl library. |
93ec662e JD |
3939 | * |
3940 | * Ask the consumer to truncate the existing metadata file(s) and | |
3941 | * then regenerate the metadata. Live and per-pid sessions are not | |
3942 | * supported and return an error. | |
3943 | * | |
3944 | * Return 0 on success or else a LTTNG_ERR code. | |
3945 | */ | |
eded6438 | 3946 | int cmd_regenerate_metadata(struct ltt_session *session) |
93ec662e JD |
3947 | { |
3948 | int ret; | |
3949 | ||
3950 | assert(session); | |
3951 | ||
eded6438 | 3952 | ret = check_regenerate_metadata_support(session); |
93ec662e JD |
3953 | if (ret) { |
3954 | goto end; | |
3955 | } | |
3956 | ||
3957 | if (session->kernel_session) { | |
eded6438 | 3958 | ret = kernctl_session_regenerate_metadata( |
93ec662e JD |
3959 | session->kernel_session->fd); |
3960 | if (ret < 0) { | |
3961 | ERR("Failed to regenerate the kernel metadata"); | |
3962 | goto end; | |
3963 | } | |
3964 | } | |
3965 | ||
3966 | if (session->ust_session) { | |
eded6438 | 3967 | ret = ust_regenerate_metadata(session->ust_session); |
93ec662e JD |
3968 | if (ret < 0) { |
3969 | ERR("Failed to regenerate the UST metadata"); | |
3970 | goto end; | |
3971 | } | |
3972 | } | |
3973 | DBG("Cmd metadata regenerate for session %s", session->name); | |
3974 | ret = LTTNG_OK; | |
3975 | ||
3976 | end: | |
3977 | return ret; | |
3978 | } | |
3979 | ||
c2561365 JD |
3980 | /* |
3981 | * Command LTTNG_REGENERATE_STATEDUMP from the lttng-ctl library. | |
3982 | * | |
3983 | * Ask the tracer to regenerate a new statedump. | |
3984 | * | |
3985 | * Return 0 on success or else a LTTNG_ERR code. | |
3986 | */ | |
3987 | int cmd_regenerate_statedump(struct ltt_session *session) | |
3988 | { | |
3989 | int ret; | |
3990 | ||
3991 | assert(session); | |
3992 | ||
3993 | if (!session->active) { | |
3994 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
3995 | goto end; | |
3996 | } | |
c2561365 JD |
3997 | |
3998 | if (session->kernel_session) { | |
3999 | ret = kernctl_session_regenerate_statedump( | |
4000 | session->kernel_session->fd); | |
4001 | /* | |
4002 | * Currently, the statedump in kernel can only fail if out | |
4003 | * of memory. | |
4004 | */ | |
4005 | if (ret < 0) { | |
4006 | if (ret == -ENOMEM) { | |
4007 | ret = LTTNG_ERR_REGEN_STATEDUMP_NOMEM; | |
4008 | } else { | |
4009 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
4010 | } | |
4011 | ERR("Failed to regenerate the kernel statedump"); | |
4012 | goto end; | |
4013 | } | |
4014 | } | |
4015 | ||
4016 | if (session->ust_session) { | |
4017 | ret = ust_app_regenerate_statedump_all(session->ust_session); | |
4018 | /* | |
4019 | * Currently, the statedump in UST always returns 0. | |
4020 | */ | |
4021 | if (ret < 0) { | |
4022 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
4023 | ERR("Failed to regenerate the UST statedump"); | |
4024 | goto end; | |
4025 | } | |
4026 | } | |
4027 | DBG("Cmd regenerate statedump for session %s", session->name); | |
4028 | ret = LTTNG_OK; | |
4029 | ||
4030 | end: | |
4031 | return ret; | |
4032 | } | |
4033 | ||
b0880ae5 JG |
4034 | int cmd_register_trigger(struct command_ctx *cmd_ctx, int sock, |
4035 | struct notification_thread_handle *notification_thread) | |
4036 | { | |
4037 | int ret; | |
4038 | size_t trigger_len; | |
4039 | ssize_t sock_recv_len; | |
4040 | struct lttng_trigger *trigger = NULL; | |
4041 | struct lttng_buffer_view view; | |
4042 | struct lttng_dynamic_buffer trigger_buffer; | |
4043 | ||
4044 | lttng_dynamic_buffer_init(&trigger_buffer); | |
4045 | trigger_len = (size_t) cmd_ctx->lsm->u.trigger.length; | |
4046 | ret = lttng_dynamic_buffer_set_size(&trigger_buffer, trigger_len); | |
4047 | if (ret) { | |
4048 | ret = LTTNG_ERR_NOMEM; | |
4049 | goto end; | |
4050 | } | |
4051 | ||
4052 | sock_recv_len = lttcomm_recv_unix_sock(sock, trigger_buffer.data, | |
4053 | trigger_len); | |
4054 | if (sock_recv_len < 0 || sock_recv_len != trigger_len) { | |
4055 | ERR("Failed to receive \"register trigger\" command payload"); | |
4056 | /* TODO: should this be a new error enum ? */ | |
4057 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
4058 | goto end; | |
4059 | } | |
4060 | ||
4061 | view = lttng_buffer_view_from_dynamic_buffer(&trigger_buffer, 0, -1); | |
4062 | if (lttng_trigger_create_from_buffer(&view, &trigger) != | |
4063 | trigger_len) { | |
4064 | ERR("Invalid trigger payload received in \"register trigger\" command"); | |
4065 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
4066 | goto end; | |
4067 | } | |
4068 | ||
4069 | ret = notification_thread_command_register_trigger(notification_thread, | |
4070 | trigger); | |
587f9fd0 JG |
4071 | /* Ownership of trigger was transferred. */ |
4072 | trigger = NULL; | |
b0880ae5 | 4073 | end: |
587f9fd0 | 4074 | lttng_trigger_destroy(trigger); |
b0880ae5 JG |
4075 | lttng_dynamic_buffer_reset(&trigger_buffer); |
4076 | return ret; | |
4077 | } | |
4078 | ||
4079 | int cmd_unregister_trigger(struct command_ctx *cmd_ctx, int sock, | |
4080 | struct notification_thread_handle *notification_thread) | |
4081 | { | |
4082 | int ret; | |
4083 | size_t trigger_len; | |
4084 | ssize_t sock_recv_len; | |
4085 | struct lttng_trigger *trigger = NULL; | |
4086 | struct lttng_buffer_view view; | |
4087 | struct lttng_dynamic_buffer trigger_buffer; | |
4088 | ||
4089 | lttng_dynamic_buffer_init(&trigger_buffer); | |
4090 | trigger_len = (size_t) cmd_ctx->lsm->u.trigger.length; | |
4091 | ret = lttng_dynamic_buffer_set_size(&trigger_buffer, trigger_len); | |
4092 | if (ret) { | |
4093 | ret = LTTNG_ERR_NOMEM; | |
4094 | goto end; | |
4095 | } | |
4096 | ||
4097 | sock_recv_len = lttcomm_recv_unix_sock(sock, trigger_buffer.data, | |
4098 | trigger_len); | |
4099 | if (sock_recv_len < 0 || sock_recv_len != trigger_len) { | |
4100 | ERR("Failed to receive \"unregister trigger\" command payload"); | |
4101 | /* TODO: should this be a new error enum ? */ | |
4102 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
4103 | goto end; | |
4104 | } | |
4105 | ||
4106 | view = lttng_buffer_view_from_dynamic_buffer(&trigger_buffer, 0, -1); | |
4107 | if (lttng_trigger_create_from_buffer(&view, &trigger) != | |
4108 | trigger_len) { | |
4109 | ERR("Invalid trigger payload received in \"unregister trigger\" command"); | |
4110 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
4111 | goto end; | |
4112 | } | |
4113 | ||
4114 | ret = notification_thread_command_unregister_trigger(notification_thread, | |
4115 | trigger); | |
4116 | end: | |
587f9fd0 | 4117 | lttng_trigger_destroy(trigger); |
b0880ae5 JG |
4118 | lttng_dynamic_buffer_reset(&trigger_buffer); |
4119 | return ret; | |
4120 | } | |
4121 | ||
6dc3064a DG |
4122 | /* |
4123 | * Send relayd sockets from snapshot output to consumer. Ignore request if the | |
4124 | * snapshot output is *not* set with a remote destination. | |
4125 | * | |
a934f4af | 4126 | * Return 0 on success or a LTTNG_ERR code. |
6dc3064a DG |
4127 | */ |
4128 | static int set_relayd_for_snapshot(struct consumer_output *consumer, | |
4129 | struct snapshot_output *snap_output, struct ltt_session *session) | |
4130 | { | |
a934f4af | 4131 | int ret = LTTNG_OK; |
6dc3064a DG |
4132 | struct lttng_ht_iter iter; |
4133 | struct consumer_socket *socket; | |
4134 | ||
4135 | assert(consumer); | |
4136 | assert(snap_output); | |
4137 | assert(session); | |
4138 | ||
4139 | DBG2("Set relayd object from snapshot output"); | |
4140 | ||
4141 | /* Ignore if snapshot consumer output is not network. */ | |
4142 | if (snap_output->consumer->type != CONSUMER_DST_NET) { | |
4143 | goto error; | |
4144 | } | |
4145 | ||
4146 | /* | |
4147 | * For each consumer socket, create and send the relayd object of the | |
4148 | * snapshot output. | |
4149 | */ | |
4150 | rcu_read_lock(); | |
5eecee74 DG |
4151 | cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter, |
4152 | socket, node.node) { | |
ecd0f96d | 4153 | pthread_mutex_lock(socket->lock); |
6dc3064a | 4154 | ret = send_consumer_relayd_sockets(0, session->id, |
d3e2ba59 JD |
4155 | snap_output->consumer, socket, |
4156 | session->name, session->hostname, | |
4157 | session->live_timer); | |
ecd0f96d | 4158 | pthread_mutex_unlock(socket->lock); |
a934f4af | 4159 | if (ret != LTTNG_OK) { |
6dc3064a DG |
4160 | rcu_read_unlock(); |
4161 | goto error; | |
4162 | } | |
4163 | } | |
4164 | rcu_read_unlock(); | |
4165 | ||
4166 | error: | |
4167 | return ret; | |
4168 | } | |
4169 | ||
4170 | /* | |
4171 | * Record a kernel snapshot. | |
4172 | * | |
fac41e72 | 4173 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a DG |
4174 | */ |
4175 | static int record_kernel_snapshot(struct ltt_kernel_session *ksess, | |
5c786ded | 4176 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 4177 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
4178 | { |
4179 | int ret; | |
4180 | ||
4181 | assert(ksess); | |
4182 | assert(output); | |
4183 | assert(session); | |
4184 | ||
10a50311 | 4185 | |
af706bb7 DG |
4186 | /* |
4187 | * Copy kernel session sockets so we can communicate with the right | |
4188 | * consumer for the snapshot record command. | |
4189 | */ | |
4190 | ret = consumer_copy_sockets(output->consumer, ksess->consumer); | |
4191 | if (ret < 0) { | |
a934f4af | 4192 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 4193 | goto error; |
6dc3064a DG |
4194 | } |
4195 | ||
4196 | ret = set_relayd_for_snapshot(ksess->consumer, output, session); | |
a934f4af | 4197 | if (ret != LTTNG_OK) { |
af706bb7 | 4198 | goto error_snapshot; |
6dc3064a DG |
4199 | } |
4200 | ||
d07ceecd | 4201 | ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream); |
2a06df8d | 4202 | if (ret != LTTNG_OK) { |
af706bb7 | 4203 | goto error_snapshot; |
6dc3064a DG |
4204 | } |
4205 | ||
a934f4af | 4206 | ret = LTTNG_OK; |
1371fc12 | 4207 | goto end; |
a934f4af | 4208 | |
af706bb7 DG |
4209 | error_snapshot: |
4210 | /* Clean up copied sockets so this output can use some other later on. */ | |
4211 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a | 4212 | error: |
1371fc12 | 4213 | end: |
6dc3064a DG |
4214 | return ret; |
4215 | } | |
4216 | ||
4217 | /* | |
4218 | * Record a UST snapshot. | |
4219 | * | |
a934f4af | 4220 | * Return 0 on success or a LTTNG_ERR error code. |
6dc3064a DG |
4221 | */ |
4222 | static int record_ust_snapshot(struct ltt_ust_session *usess, | |
5c786ded | 4223 | struct snapshot_output *output, struct ltt_session *session, |
d07ceecd | 4224 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
4225 | { |
4226 | int ret; | |
4227 | ||
4228 | assert(usess); | |
4229 | assert(output); | |
4230 | assert(session); | |
4231 | ||
af706bb7 | 4232 | /* |
d3f14b8a | 4233 | * Copy UST session sockets so we can communicate with the right |
af706bb7 DG |
4234 | * consumer for the snapshot record command. |
4235 | */ | |
4236 | ret = consumer_copy_sockets(output->consumer, usess->consumer); | |
4237 | if (ret < 0) { | |
a934f4af | 4238 | ret = LTTNG_ERR_NOMEM; |
af706bb7 | 4239 | goto error; |
6dc3064a DG |
4240 | } |
4241 | ||
4242 | ret = set_relayd_for_snapshot(usess->consumer, output, session); | |
a934f4af | 4243 | if (ret != LTTNG_OK) { |
af706bb7 | 4244 | goto error_snapshot; |
6dc3064a DG |
4245 | } |
4246 | ||
d07ceecd | 4247 | ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream); |
6dc3064a | 4248 | if (ret < 0) { |
7badf927 DG |
4249 | switch (-ret) { |
4250 | case EINVAL: | |
a934f4af | 4251 | ret = LTTNG_ERR_INVALID; |
7badf927 | 4252 | break; |
7badf927 DG |
4253 | default: |
4254 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
4255 | break; | |
5c786ded | 4256 | } |
af706bb7 | 4257 | goto error_snapshot; |
6dc3064a DG |
4258 | } |
4259 | ||
a934f4af DG |
4260 | ret = LTTNG_OK; |
4261 | ||
af706bb7 DG |
4262 | error_snapshot: |
4263 | /* Clean up copied sockets so this output can use some other later on. */ | |
4264 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a DG |
4265 | error: |
4266 | return ret; | |
4267 | } | |
4268 | ||
d07ceecd MD |
4269 | static |
4270 | uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session, | |
4271 | uint64_t cur_nr_packets) | |
68808f4e | 4272 | { |
d07ceecd | 4273 | uint64_t tot_size = 0; |
68808f4e DG |
4274 | |
4275 | if (session->kernel_session) { | |
4276 | struct ltt_kernel_channel *chan; | |
4277 | struct ltt_kernel_session *ksess = session->kernel_session; | |
4278 | ||
68808f4e | 4279 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
d07ceecd MD |
4280 | if (cur_nr_packets >= chan->channel->attr.num_subbuf) { |
4281 | /* | |
4282 | * Don't take channel into account if we | |
4283 | * already grab all its packets. | |
4284 | */ | |
4285 | continue; | |
68808f4e | 4286 | } |
d07ceecd MD |
4287 | tot_size += chan->channel->attr.subbuf_size |
4288 | * chan->stream_count; | |
68808f4e DG |
4289 | } |
4290 | } | |
4291 | ||
4292 | if (session->ust_session) { | |
68808f4e DG |
4293 | struct ltt_ust_session *usess = session->ust_session; |
4294 | ||
d07ceecd MD |
4295 | tot_size += ust_app_get_size_one_more_packet_per_stream(usess, |
4296 | cur_nr_packets); | |
68808f4e DG |
4297 | } |
4298 | ||
d07ceecd | 4299 | return tot_size; |
68808f4e DG |
4300 | } |
4301 | ||
5c786ded | 4302 | /* |
d07ceecd MD |
4303 | * Calculate the number of packets we can grab from each stream that |
4304 | * fits within the overall snapshot max size. | |
4305 | * | |
4306 | * Returns -1 on error, 0 means infinite number of packets, else > 0 is | |
4307 | * the number of packets per stream. | |
4308 | * | |
4309 | * TODO: this approach is not perfect: we consider the worse case | |
4310 | * (packet filling the sub-buffers) as an upper bound, but we could do | |
4311 | * better if we do this calculation while we actually grab the packet | |
4312 | * content: we would know how much padding we don't actually store into | |
4313 | * the file. | |
4314 | * | |
4315 | * This algorithm is currently bounded by the number of packets per | |
4316 | * stream. | |
4317 | * | |
4318 | * Since we call this algorithm before actually grabbing the data, it's | |
4319 | * an approximation: for instance, applications could appear/disappear | |
4320 | * in between this call and actually grabbing data. | |
5c786ded | 4321 | */ |
d07ceecd MD |
4322 | static |
4323 | int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size) | |
5c786ded | 4324 | { |
d07ceecd MD |
4325 | int64_t size_left; |
4326 | uint64_t cur_nb_packets = 0; | |
5c786ded | 4327 | |
d07ceecd MD |
4328 | if (!max_size) { |
4329 | return 0; /* Infinite */ | |
5c786ded JD |
4330 | } |
4331 | ||
d07ceecd MD |
4332 | size_left = max_size; |
4333 | for (;;) { | |
4334 | uint64_t one_more_packet_tot_size; | |
5c786ded | 4335 | |
d07ceecd MD |
4336 | one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session, |
4337 | cur_nb_packets); | |
4338 | if (!one_more_packet_tot_size) { | |
4339 | /* We are already grabbing all packets. */ | |
4340 | break; | |
4341 | } | |
4342 | size_left -= one_more_packet_tot_size; | |
4343 | if (size_left < 0) { | |
4344 | break; | |
4345 | } | |
4346 | cur_nb_packets++; | |
5c786ded | 4347 | } |
d07ceecd MD |
4348 | if (!cur_nb_packets) { |
4349 | /* Not enough room to grab one packet of each stream, error. */ | |
4350 | return -1; | |
4351 | } | |
4352 | return cur_nb_packets; | |
5c786ded JD |
4353 | } |
4354 | ||
6dc3064a DG |
4355 | /* |
4356 | * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl. | |
4357 | * | |
4358 | * The wait parameter is ignored so this call always wait for the snapshot to | |
4359 | * complete before returning. | |
4360 | * | |
4361 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
4362 | */ | |
4363 | int cmd_snapshot_record(struct ltt_session *session, | |
4364 | struct lttng_snapshot_output *output, int wait) | |
4365 | { | |
4366 | int ret = LTTNG_OK; | |
e1986656 DG |
4367 | unsigned int use_tmp_output = 0; |
4368 | struct snapshot_output tmp_output; | |
00e1dfc4 | 4369 | unsigned int snapshot_success = 0; |
10ba83fe | 4370 | char datetime[16]; |
6dc3064a DG |
4371 | |
4372 | assert(session); | |
ba45d9f0 | 4373 | assert(output); |
6dc3064a DG |
4374 | |
4375 | DBG("Cmd snapshot record for session %s", session->name); | |
4376 | ||
10ba83fe JR |
4377 | /* Get the datetime for the snapshot output directory. */ |
4378 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", datetime, | |
4379 | sizeof(datetime)); | |
4380 | if (!ret) { | |
4381 | ret = LTTNG_ERR_INVALID; | |
4382 | goto error; | |
4383 | } | |
4384 | ||
6dc3064a | 4385 | /* |
d3f14b8a MD |
4386 | * Permission denied to create an output if the session is not |
4387 | * set in no output mode. | |
6dc3064a DG |
4388 | */ |
4389 | if (session->output_traces) { | |
903ef685 | 4390 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
4391 | goto error; |
4392 | } | |
4393 | ||
4394 | /* The session needs to be started at least once. */ | |
8382cf6f | 4395 | if (!session->has_been_started) { |
6dc3064a DG |
4396 | ret = LTTNG_ERR_START_SESSION_ONCE; |
4397 | goto error; | |
4398 | } | |
4399 | ||
4400 | /* Use temporary output for the session. */ | |
ba45d9f0 | 4401 | if (*output->ctrl_url != '\0') { |
6dc3064a DG |
4402 | ret = snapshot_output_init(output->max_size, output->name, |
4403 | output->ctrl_url, output->data_url, session->consumer, | |
e1986656 | 4404 | &tmp_output, NULL); |
6dc3064a DG |
4405 | if (ret < 0) { |
4406 | if (ret == -ENOMEM) { | |
4407 | ret = LTTNG_ERR_NOMEM; | |
4408 | } else { | |
4409 | ret = LTTNG_ERR_INVALID; | |
4410 | } | |
4411 | goto error; | |
4412 | } | |
1bfe7328 DG |
4413 | /* Use the global session count for the temporary snapshot. */ |
4414 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; | |
10ba83fe JR |
4415 | |
4416 | /* Use the global datetime */ | |
4417 | memcpy(tmp_output.datetime, datetime, sizeof(datetime)); | |
e1986656 | 4418 | use_tmp_output = 1; |
6dc3064a DG |
4419 | } |
4420 | ||
804c90a8 JR |
4421 | if (use_tmp_output) { |
4422 | int64_t nb_packets_per_stream; | |
6dc3064a | 4423 | |
804c90a8 JR |
4424 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, |
4425 | tmp_output.max_size); | |
4426 | if (nb_packets_per_stream < 0) { | |
4427 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
4428 | goto error; | |
4429 | } | |
d07ceecd | 4430 | |
804c90a8 JR |
4431 | if (session->kernel_session) { |
4432 | ret = record_kernel_snapshot(session->kernel_session, | |
4433 | &tmp_output, session, | |
4434 | wait, nb_packets_per_stream); | |
4435 | if (ret != LTTNG_OK) { | |
d07ceecd MD |
4436 | goto error; |
4437 | } | |
804c90a8 JR |
4438 | } |
4439 | ||
4440 | if (session->ust_session) { | |
4441 | ret = record_ust_snapshot(session->ust_session, | |
4442 | &tmp_output, session, | |
d07ceecd | 4443 | wait, nb_packets_per_stream); |
a934f4af | 4444 | if (ret != LTTNG_OK) { |
6dc3064a DG |
4445 | goto error; |
4446 | } | |
804c90a8 | 4447 | } |
e1986656 | 4448 | |
804c90a8 JR |
4449 | snapshot_success = 1; |
4450 | } else { | |
4451 | struct snapshot_output *sout; | |
4452 | struct lttng_ht_iter iter; | |
68808f4e | 4453 | |
804c90a8 JR |
4454 | rcu_read_lock(); |
4455 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
4456 | &iter.iter, sout, node.node) { | |
4457 | int64_t nb_packets_per_stream; | |
e1986656 | 4458 | |
804c90a8 JR |
4459 | /* |
4460 | * Make a local copy of the output and assign the possible | |
4461 | * temporary value given by the caller. | |
4462 | */ | |
4463 | memset(&tmp_output, 0, sizeof(tmp_output)); | |
4464 | memcpy(&tmp_output, sout, sizeof(tmp_output)); | |
1bfe7328 | 4465 | |
804c90a8 JR |
4466 | if (output->max_size != (uint64_t) -1ULL) { |
4467 | tmp_output.max_size = output->max_size; | |
6dc3064a | 4468 | } |
d07ceecd MD |
4469 | |
4470 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
4471 | tmp_output.max_size); | |
4472 | if (nb_packets_per_stream < 0) { | |
4473 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
804c90a8 | 4474 | rcu_read_unlock(); |
d07ceecd MD |
4475 | goto error; |
4476 | } | |
6dc3064a | 4477 | |
804c90a8 JR |
4478 | /* Use temporary name. */ |
4479 | if (*output->name != '\0') { | |
cf3e357d MD |
4480 | if (lttng_strncpy(tmp_output.name, output->name, |
4481 | sizeof(tmp_output.name))) { | |
4482 | ret = LTTNG_ERR_INVALID; | |
4483 | rcu_read_unlock(); | |
4484 | goto error; | |
4485 | } | |
804c90a8 | 4486 | } |
e1986656 | 4487 | |
804c90a8 | 4488 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; |
10ba83fe | 4489 | memcpy(tmp_output.datetime, datetime, sizeof(datetime)); |
e1986656 | 4490 | |
804c90a8 JR |
4491 | if (session->kernel_session) { |
4492 | ret = record_kernel_snapshot(session->kernel_session, | |
4493 | &tmp_output, session, | |
4494 | wait, nb_packets_per_stream); | |
4495 | if (ret != LTTNG_OK) { | |
d07ceecd | 4496 | rcu_read_unlock(); |
68808f4e DG |
4497 | goto error; |
4498 | } | |
804c90a8 | 4499 | } |
68808f4e | 4500 | |
804c90a8 JR |
4501 | if (session->ust_session) { |
4502 | ret = record_ust_snapshot(session->ust_session, | |
4503 | &tmp_output, session, | |
d07ceecd | 4504 | wait, nb_packets_per_stream); |
a934f4af | 4505 | if (ret != LTTNG_OK) { |
6dc3064a DG |
4506 | rcu_read_unlock(); |
4507 | goto error; | |
4508 | } | |
4509 | } | |
804c90a8 | 4510 | snapshot_success = 1; |
6dc3064a | 4511 | } |
804c90a8 | 4512 | rcu_read_unlock(); |
6dc3064a DG |
4513 | } |
4514 | ||
1bfe7328 DG |
4515 | if (snapshot_success) { |
4516 | session->snapshot.nb_snapshot++; | |
b67578cb MD |
4517 | } else { |
4518 | ret = LTTNG_ERR_SNAPSHOT_FAIL; | |
1bfe7328 DG |
4519 | } |
4520 | ||
6dc3064a | 4521 | error: |
6dc3064a DG |
4522 | return ret; |
4523 | } | |
4524 | ||
d7ba1388 MD |
4525 | /* |
4526 | * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread. | |
4527 | */ | |
4528 | int cmd_set_session_shm_path(struct ltt_session *session, | |
4529 | const char *shm_path) | |
4530 | { | |
4531 | /* Safety net */ | |
4532 | assert(session); | |
4533 | ||
4534 | /* | |
4535 | * Can only set shm path before session is started. | |
4536 | */ | |
4537 | if (session->has_been_started) { | |
4538 | return LTTNG_ERR_SESSION_STARTED; | |
4539 | } | |
4540 | ||
4541 | strncpy(session->shm_path, shm_path, | |
4542 | sizeof(session->shm_path)); | |
4543 | session->shm_path[sizeof(session->shm_path) - 1] = '\0'; | |
4544 | ||
4545 | return 0; | |
4546 | } | |
4547 | ||
5c408ad8 JD |
4548 | /* |
4549 | * Command LTTNG_ROTATE_SESSION from the lttng-ctl library. | |
4550 | * | |
4551 | * Ask the consumer to rotate the session output directory. | |
4552 | * The session lock must be held. | |
4553 | * | |
4554 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
4555 | */ | |
4556 | int cmd_rotate_session(struct ltt_session *session, | |
4557 | struct lttng_rotate_session_return *rotate_return) | |
4558 | { | |
4559 | int ret; | |
4560 | size_t strf_ret; | |
4561 | struct tm *timeinfo; | |
fc58be13 | 4562 | char datetime[21]; |
5c408ad8 JD |
4563 | time_t now; |
4564 | bool ust_active = false; | |
4565 | ||
4566 | assert(session); | |
4567 | ||
4568 | if (!session->has_been_started) { | |
4569 | ret = -LTTNG_ERR_START_SESSION_ONCE; | |
d68c9a04 | 4570 | goto end; |
5c408ad8 JD |
4571 | } |
4572 | ||
4573 | if (session->live_timer || session->snapshot_mode || | |
4574 | !session->output_traces) { | |
4575 | ret = -LTTNG_ERR_ROTATION_NOT_AVAILABLE; | |
d68c9a04 | 4576 | goto end; |
5c408ad8 JD |
4577 | } |
4578 | ||
4579 | /* | |
4580 | * Unsupported feature in lttng-relayd before 2.11. | |
4581 | */ | |
4582 | if (session->consumer->type == CONSUMER_DST_NET && | |
4583 | (session->consumer->relay_major_version == 2 && | |
4584 | session->consumer->relay_minor_version < 11)) { | |
504521ea | 4585 | ret = -LTTNG_ERR_ROTATION_NOT_AVAILABLE_RELAY; |
d68c9a04 | 4586 | goto end; |
5c408ad8 JD |
4587 | } |
4588 | ||
4589 | if (session->rotate_pending || session->rotate_pending_relay) { | |
4590 | ret = -LTTNG_ERR_ROTATION_PENDING; | |
4591 | DBG("Rotate already in progress"); | |
d68c9a04 | 4592 | goto end; |
5c408ad8 JD |
4593 | } |
4594 | ||
4595 | /* | |
4596 | * After a stop, we only allow one rotation to occur, the other ones are | |
4597 | * useless until a new start. | |
4598 | */ | |
4599 | if (session->rotated_after_last_stop) { | |
4600 | DBG("Session \"%s\" was already rotated after stop, refusing rotation", | |
4601 | session->name); | |
4602 | ret = -LTTNG_ERR_ROTATION_MULTIPLE_AFTER_STOP; | |
d68c9a04 | 4603 | goto end; |
5c408ad8 JD |
4604 | } |
4605 | ||
4606 | /* Special case for the first rotation. */ | |
ad9f5c17 | 4607 | if (session->current_archive_id == 0) { |
5c408ad8 JD |
4608 | const char *base_path = NULL; |
4609 | ||
4610 | /* Either one of the two sessions is enough to get the root path. */ | |
4611 | if (session->kernel_session) { | |
4612 | base_path = session_get_base_path(session); | |
4613 | } else if (session->ust_session) { | |
4614 | base_path = session_get_base_path(session); | |
4615 | } else { | |
4616 | assert(0); | |
4617 | } | |
4618 | assert(base_path); | |
4619 | ret = lttng_strncpy(session->rotation_chunk.current_rotate_path, | |
4620 | base_path, | |
4621 | sizeof(session->rotation_chunk.current_rotate_path)); | |
4622 | if (ret) { | |
4623 | ERR("Failed to copy session base path to current rotation chunk path"); | |
4624 | ret = -LTTNG_ERR_UNK; | |
d68c9a04 | 4625 | goto end; |
5c408ad8 JD |
4626 | } |
4627 | } else { | |
4628 | /* | |
4629 | * The currently active tracing path is now the folder we | |
4630 | * want to rotate. | |
4631 | */ | |
4632 | ret = lttng_strncpy(session->rotation_chunk.current_rotate_path, | |
4633 | session->rotation_chunk.active_tracing_path, | |
4634 | sizeof(session->rotation_chunk.current_rotate_path)); | |
4635 | if (ret) { | |
4636 | ERR("Failed to copy the active tracing path to the current rotate path"); | |
4637 | ret = -LTTNG_ERR_UNK; | |
d68c9a04 | 4638 | goto end; |
5c408ad8 JD |
4639 | } |
4640 | } | |
4641 | DBG("Current rotate path %s", session->rotation_chunk.current_rotate_path); | |
4642 | ||
ad9f5c17 | 4643 | session->current_archive_id++; |
5c408ad8 | 4644 | session->rotate_pending = true; |
d68c9a04 | 4645 | session->rotation_state = LTTNG_ROTATION_STATE_ONGOING; |
0ca52944 JG |
4646 | ret = notification_thread_command_session_rotation_ongoing( |
4647 | notification_thread_handle, | |
17dd1232 JG |
4648 | session->name, session->uid, session->gid, |
4649 | session->current_archive_id); | |
4650 | if (ret != LTTNG_OK) { | |
4651 | ERR("Failed to notify notification thread that a session rotation is ongoing for session %s", | |
4652 | session->name); | |
0ca52944 | 4653 | } |
5c408ad8 JD |
4654 | |
4655 | /* | |
4656 | * Create the path name for the next chunk. | |
4657 | */ | |
4658 | now = time(NULL); | |
4659 | if (now == (time_t) -1) { | |
4660 | ret = -LTTNG_ERR_ROTATION_NOT_AVAILABLE; | |
d68c9a04 | 4661 | goto end; |
5c408ad8 JD |
4662 | } |
4663 | session->last_chunk_start_ts = session->current_chunk_start_ts; | |
4664 | session->current_chunk_start_ts = now; | |
4665 | ||
4666 | timeinfo = localtime(&now); | |
4667 | if (!timeinfo) { | |
4668 | PERROR("Failed to sample local time in rotate session command"); | |
4669 | ret = -LTTNG_ERR_UNK; | |
d68c9a04 | 4670 | goto end; |
5c408ad8 | 4671 | } |
fc58be13 | 4672 | strf_ret = strftime(datetime, sizeof(datetime), "%Y%m%dT%H%M%S%z", |
5c408ad8 JD |
4673 | timeinfo); |
4674 | if (!strf_ret) { | |
4675 | ERR("Failed to format local time timestamp in rotate session command"); | |
4676 | ret = -LTTNG_ERR_UNK; | |
d68c9a04 | 4677 | goto end; |
5c408ad8 JD |
4678 | } |
4679 | if (session->kernel_session) { | |
4680 | /* | |
4681 | * The active path for the next rotation/destroy. | |
4682 | * Ex: ~/lttng-traces/auto-20170922-111748/20170922-111754-42 | |
4683 | */ | |
4684 | ret = snprintf(session->rotation_chunk.active_tracing_path, | |
4685 | sizeof(session->rotation_chunk.active_tracing_path), | |
4686 | "%s/%s-%" PRIu64, | |
4687 | session_get_base_path(session), | |
ad9f5c17 | 4688 | datetime, session->current_archive_id + 1); |
5c408ad8 JD |
4689 | if (ret < 0 || ret == sizeof(session->rotation_chunk.active_tracing_path)) { |
4690 | ERR("Failed to format active kernel tracing path in rotate session command"); | |
4691 | ret = -LTTNG_ERR_UNK; | |
d68c9a04 | 4692 | goto end; |
5c408ad8 JD |
4693 | } |
4694 | /* | |
4695 | * The sub-directory for the consumer | |
4696 | * Ex: /20170922-111754-42/kernel | |
4697 | */ | |
4698 | ret = snprintf(session->kernel_session->consumer->chunk_path, | |
4699 | sizeof(session->kernel_session->consumer->chunk_path), | |
4700 | "/%s-%" PRIu64, datetime, | |
ad9f5c17 | 4701 | session->current_archive_id + 1); |
5c408ad8 JD |
4702 | if (ret < 0 || ret == sizeof(session->kernel_session->consumer->chunk_path)) { |
4703 | ERR("Failed to format the kernel consumer's sub-directory in rotate session command"); | |
4704 | ret = -LTTNG_ERR_UNK; | |
d68c9a04 | 4705 | goto end; |
5c408ad8 JD |
4706 | } |
4707 | /* | |
4708 | * Create the new chunk folder, before the rotation begins so we don't | |
4709 | * race with the consumer/tracer activity. | |
4710 | */ | |
4711 | ret = domain_mkdir(session->kernel_session->consumer, session, | |
4712 | session->kernel_session->uid, | |
4713 | session->kernel_session->gid); | |
4714 | if (ret) { | |
4715 | ERR("Failed to create kernel session tracing path at %s", | |
d68c9a04 JD |
4716 | session->kernel_session->consumer->chunk_path); |
4717 | ret = -LTTNG_ERR_CREATE_DIR_FAIL; | |
4718 | goto end; | |
5c408ad8 JD |
4719 | } |
4720 | ret = kernel_rotate_session(session); | |
4721 | if (ret != LTTNG_OK) { | |
d68c9a04 JD |
4722 | ret = -ret; |
4723 | goto end; | |
5c408ad8 JD |
4724 | } |
4725 | } | |
4726 | if (session->ust_session) { | |
4727 | ret = snprintf(session->rotation_chunk.active_tracing_path, | |
4728 | PATH_MAX, "%s/%s-%" PRIu64, | |
4729 | session_get_base_path(session), | |
ad9f5c17 | 4730 | datetime, session->current_archive_id + 1); |
5c408ad8 JD |
4731 | if (ret < 0) { |
4732 | ERR("Failed to format active UST tracing path in rotate session command"); | |
4733 | ret = -LTTNG_ERR_UNK; | |
d68c9a04 | 4734 | goto end; |
5c408ad8 JD |
4735 | } |
4736 | ret = snprintf(session->ust_session->consumer->chunk_path, | |
4737 | PATH_MAX, "/%s-%" PRIu64, datetime, | |
ad9f5c17 | 4738 | session->current_archive_id + 1); |
5c408ad8 JD |
4739 | if (ret < 0) { |
4740 | ERR("Failed to format the UST consumer's sub-directory in rotate session command"); | |
4741 | ret = -LTTNG_ERR_UNK; | |
d68c9a04 | 4742 | goto end; |
5c408ad8 JD |
4743 | } |
4744 | /* | |
4745 | * Create the new chunk folder, before the rotation begins so we don't | |
4746 | * race with the consumer/tracer activity. | |
4747 | */ | |
4748 | ret = domain_mkdir(session->ust_session->consumer, session, | |
4749 | session->ust_session->uid, | |
4750 | session->ust_session->gid); | |
b019620d JG |
4751 | if (ret) { |
4752 | ret = -LTTNG_ERR_CREATE_DIR_FAIL; | |
4753 | goto end; | |
4754 | } | |
5c408ad8 JD |
4755 | ret = ust_app_rotate_session(session, &ust_active); |
4756 | if (ret != LTTNG_OK) { | |
d68c9a04 | 4757 | goto end; |
5c408ad8 JD |
4758 | } |
4759 | /* | |
4760 | * Handle the case where we did not start a rotation on any channel. | |
4761 | * The consumer will never wake up the rotation thread to perform the | |
4762 | * rename, so we have to do it here while we hold the session and | |
4763 | * session_list locks. | |
4764 | */ | |
4765 | if (!session->kernel_session && !ust_active) { | |
17dd1232 JG |
4766 | struct lttng_trace_archive_location *location; |
4767 | ||
4768 | session->rotate_pending = false; | |
4769 | session->rotation_state = LTTNG_ROTATION_STATE_COMPLETED; | |
5c408ad8 JD |
4770 | ret = rename_complete_chunk(session, now); |
4771 | if (ret < 0) { | |
4772 | ERR("Failed to rename completed rotation chunk"); | |
4773 | goto end; | |
4774 | } | |
17dd1232 JG |
4775 | |
4776 | /* Ownership of location is transferred. */ | |
4777 | location = session_get_trace_archive_location(session); | |
4778 | ret = notification_thread_command_session_rotation_completed( | |
4779 | notification_thread_handle, | |
4780 | session->name, | |
4781 | session->uid, | |
4782 | session->gid, | |
4783 | session->current_archive_id, | |
4784 | location); | |
4785 | if (ret != LTTNG_OK) { | |
4786 | ERR("Failed to notify notification thread that rotation is complete for session %s", | |
4787 | session->name); | |
4788 | } | |
5c408ad8 JD |
4789 | } |
4790 | } | |
4791 | ||
4792 | if (!session->active) { | |
4793 | session->rotated_after_last_stop = true; | |
4794 | } | |
4795 | ||
4796 | if (rotate_return) { | |
ad9f5c17 | 4797 | rotate_return->rotation_id = session->current_archive_id; |
5c408ad8 JD |
4798 | } |
4799 | ||
ad9f5c17 JG |
4800 | DBG("Cmd rotate session %s, current_archive_id %" PRIu64 " sent", |
4801 | session->name, session->current_archive_id); | |
5c408ad8 JD |
4802 | ret = LTTNG_OK; |
4803 | ||
5c408ad8 JD |
4804 | end: |
4805 | return ret; | |
4806 | } | |
4807 | ||
4808 | /* | |
d68c9a04 | 4809 | * Command LTTNG_ROTATION_GET_INFO from the lttng-ctl library. |
5c408ad8 JD |
4810 | * |
4811 | * Check if the session has finished its rotation. | |
4812 | * | |
4813 | * Return 0 on success or else a LTTNG_ERR code. | |
4814 | */ | |
d68c9a04 JD |
4815 | int cmd_rotate_get_info(struct ltt_session *session, |
4816 | struct lttng_rotation_get_info_return *info_return, | |
4817 | uint64_t rotation_id) | |
5c408ad8 JD |
4818 | { |
4819 | int ret; | |
4820 | ||
4821 | assert(session); | |
4822 | ||
d68c9a04 | 4823 | DBG("Cmd rotate_get_info session %s, rotation id %" PRIu64, session->name, |
ad9f5c17 | 4824 | session->current_archive_id); |
5c408ad8 | 4825 | |
ad9f5c17 | 4826 | if (session->current_archive_id != rotation_id) { |
d68c9a04 | 4827 | info_return->status = (int32_t) LTTNG_ROTATION_STATE_EXPIRED; |
5c408ad8 JD |
4828 | ret = LTTNG_OK; |
4829 | goto end; | |
4830 | } | |
4831 | ||
d68c9a04 JD |
4832 | switch (session->rotation_state) { |
4833 | case LTTNG_ROTATION_STATE_ONGOING: | |
4834 | DBG("Reporting that rotation id %" PRIu64 " of session %s is still pending", | |
4835 | rotation_id, session->name); | |
4836 | break; | |
4837 | case LTTNG_ROTATION_STATE_COMPLETED: | |
dd73d57b JG |
4838 | { |
4839 | char *current_tracing_path_reply; | |
4840 | size_t current_tracing_path_reply_len; | |
4841 | ||
4842 | switch (session_get_consumer_destination_type(session)) { | |
4843 | case CONSUMER_DST_LOCAL: | |
4844 | current_tracing_path_reply = | |
4845 | info_return->location.local.absolute_path; | |
4846 | current_tracing_path_reply_len = | |
4847 | sizeof(info_return->location.local.absolute_path); | |
4848 | info_return->location_type = | |
05f8afa9 | 4849 | (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_LOCAL; |
dd73d57b JG |
4850 | break; |
4851 | case CONSUMER_DST_NET: | |
4852 | current_tracing_path_reply = | |
4853 | info_return->location.relay.relative_path; | |
4854 | current_tracing_path_reply_len = | |
4855 | sizeof(info_return->location.relay.relative_path); | |
4856 | /* Currently the only supported relay protocol. */ | |
4857 | info_return->location.relay.protocol = | |
05f8afa9 | 4858 | (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_RELAY_PROTOCOL_TYPE_TCP; |
dd73d57b JG |
4859 | |
4860 | ret = lttng_strncpy(info_return->location.relay.host, | |
4861 | session_get_net_consumer_hostname(session), | |
4862 | sizeof(info_return->location.relay.host)); | |
4863 | if (ret) { | |
4864 | ERR("Failed to host name to rotate_get_info reply"); | |
4865 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; | |
4866 | ret = -LTTNG_ERR_UNK; | |
4867 | goto end; | |
4868 | } | |
4869 | ||
4870 | session_get_net_consumer_ports(session, | |
4871 | &info_return->location.relay.ports.control, | |
4872 | &info_return->location.relay.ports.data); | |
4873 | info_return->location_type = | |
05f8afa9 | 4874 | (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_RELAY; |
dd73d57b JG |
4875 | break; |
4876 | default: | |
4877 | abort(); | |
4878 | } | |
4879 | ret = lttng_strncpy(current_tracing_path_reply, | |
5c408ad8 | 4880 | session->rotation_chunk.current_rotate_path, |
dd73d57b | 4881 | current_tracing_path_reply_len); |
5c408ad8 | 4882 | if (ret) { |
dd73d57b | 4883 | ERR("Failed to copy current tracing path to rotate_get_info reply"); |
d68c9a04 JD |
4884 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; |
4885 | ret = -LTTNG_ERR_UNK; | |
5c408ad8 JD |
4886 | goto end; |
4887 | } | |
dd73d57b | 4888 | |
d68c9a04 | 4889 | break; |
dd73d57b | 4890 | } |
d68c9a04 JD |
4891 | case LTTNG_ROTATION_STATE_ERROR: |
4892 | DBG("Reporting that an error occurred during rotation %" PRIu64 " of session %s", | |
4893 | rotation_id, session->name); | |
4894 | break; | |
4895 | default: | |
4896 | abort(); | |
5c408ad8 JD |
4897 | } |
4898 | ||
d68c9a04 | 4899 | info_return->status = (int32_t) session->rotation_state; |
5c408ad8 | 4900 | ret = LTTNG_OK; |
5c408ad8 JD |
4901 | end: |
4902 | return ret; | |
4903 | } | |
4904 | ||
259c2674 JD |
4905 | /* |
4906 | * Command LTTNG_ROTATION_SET_SCHEDULE from the lttng-ctl library. | |
4907 | * | |
4908 | * Configure the automatic rotation parameters. | |
66ea93b1 JG |
4909 | * 'activate' to true means activate the rotation schedule type with 'new_value'. |
4910 | * 'activate' to false means deactivate the rotation schedule and validate that | |
4911 | * 'new_value' has the same value as the currently active value. | |
259c2674 | 4912 | * |
66ea93b1 | 4913 | * Return 0 on success or else a positive LTTNG_ERR code. |
259c2674 JD |
4914 | */ |
4915 | int cmd_rotation_set_schedule(struct ltt_session *session, | |
66ea93b1 JG |
4916 | bool activate, enum lttng_rotation_schedule_type schedule_type, |
4917 | uint64_t new_value, | |
90936dcf | 4918 | struct notification_thread_handle *notification_thread_handle) |
259c2674 JD |
4919 | { |
4920 | int ret; | |
66ea93b1 | 4921 | uint64_t *parameter_value; |
259c2674 JD |
4922 | |
4923 | assert(session); | |
4924 | ||
4925 | DBG("Cmd rotate set schedule session %s", session->name); | |
4926 | ||
4927 | if (session->live_timer || session->snapshot_mode || | |
4928 | !session->output_traces) { | |
66ea93b1 | 4929 | DBG("Failing ROTATION_SET_SCHEDULE command as the rotation feature is not available for this session"); |
259c2674 JD |
4930 | ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE; |
4931 | goto end; | |
4932 | } | |
4933 | ||
66ea93b1 JG |
4934 | switch (schedule_type) { |
4935 | case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD: | |
4936 | parameter_value = &session->rotate_size; | |
4937 | break; | |
4938 | case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC: | |
4939 | parameter_value = &session->rotate_timer_period; | |
4940 | if (new_value >= UINT_MAX) { | |
4941 | DBG("Failing ROTATION_SET_SCHEDULE command as the value requested for a periodic rotation schedule is invalid: %" PRIu64 " > %u (UINT_MAX)", | |
4942 | new_value, UINT_MAX); | |
4943 | ret = LTTNG_ERR_INVALID; | |
4944 | goto end; | |
4945 | } | |
4946 | break; | |
4947 | default: | |
4948 | WARN("Failing ROTATION_SET_SCHEDULE command on unknown schedule type"); | |
4949 | ret = LTTNG_ERR_INVALID; | |
259c2674 | 4950 | goto end; |
66ea93b1 JG |
4951 | } |
4952 | ||
4953 | /* Improper use of the API. */ | |
4954 | if (new_value == -1ULL) { | |
4955 | WARN("Failing ROTATION_SET_SCHEDULE command as the value requested is -1"); | |
4956 | ret = LTTNG_ERR_INVALID; | |
259c2674 JD |
4957 | goto end; |
4958 | } | |
4959 | ||
66ea93b1 JG |
4960 | /* |
4961 | * As indicated in struct ltt_session's comments, a value of == 0 means | |
4962 | * this schedule rotation type is not in use. | |
4963 | * | |
4964 | * Reject the command if we were asked to activate a schedule that was | |
4965 | * already active. | |
4966 | */ | |
4967 | if (activate && *parameter_value != 0) { | |
4968 | DBG("Failing ROTATION_SET_SCHEDULE (activate) command as the schedule is already active"); | |
4969 | ret = LTTNG_ERR_ROTATION_SCHEDULE_SET; | |
90936dcf | 4970 | goto end; |
66ea93b1 JG |
4971 | } |
4972 | ||
4973 | /* | |
4974 | * Reject the command if we were asked to deactivate a schedule that was | |
4975 | * not active. | |
4976 | */ | |
4977 | if (!activate && *parameter_value == 0) { | |
4978 | DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as the schedule is already inactive"); | |
4979 | ret = LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET; | |
90936dcf JD |
4980 | goto end; |
4981 | } | |
4982 | ||
66ea93b1 JG |
4983 | /* |
4984 | * Reject the command if we were asked to deactivate a schedule that | |
4985 | * doesn't exist. | |
4986 | */ | |
4987 | if (!activate && *parameter_value != new_value) { | |
4988 | DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as an inexistant schedule was provided"); | |
4989 | ret = LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET; | |
4990 | goto end; | |
4991 | } | |
259c2674 | 4992 | |
66ea93b1 JG |
4993 | *parameter_value = activate ? new_value : 0; |
4994 | ||
4995 | switch (schedule_type) { | |
4996 | case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC: | |
4997 | if (activate && session->active) { | |
4998 | /* | |
4999 | * Only start the timer if the session is active, | |
5000 | * otherwise it will be started when the session starts. | |
5001 | */ | |
5002 | ret = sessiond_rotate_timer_start(session, new_value); | |
259c2674 | 5003 | if (ret) { |
66ea93b1 | 5004 | ERR("Failed to enable session rotation timer in ROTATION_SET_SCHEDULE command"); |
259c2674 JD |
5005 | ret = LTTNG_ERR_UNK; |
5006 | goto end; | |
5007 | } | |
66ea93b1 JG |
5008 | } else { |
5009 | ret = sessiond_rotate_timer_stop(session); | |
5010 | if (ret) { | |
5011 | ERR("Failed to disable session rotation timer in ROTATION_SET_SCHEDULE command"); | |
5012 | ret = LTTNG_ERR_UNK; | |
f3ce6946 | 5013 | goto end; |
66ea93b1 | 5014 | } |
259c2674 | 5015 | } |
66ea93b1 JG |
5016 | break; |
5017 | case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD: | |
5018 | if (activate) { | |
5019 | ret = subscribe_session_consumed_size_rotation(session, | |
5020 | new_value, notification_thread_handle); | |
90936dcf | 5021 | if (ret) { |
66ea93b1 | 5022 | ERR("Failed to enable consumed-size notification in ROTATION_SET_SCHEDULE command"); |
90936dcf JD |
5023 | ret = LTTNG_ERR_UNK; |
5024 | goto end; | |
5025 | } | |
90936dcf | 5026 | } else { |
66ea93b1 JG |
5027 | ret = unsubscribe_session_consumed_size_rotation(session, |
5028 | notification_thread_handle); | |
90936dcf | 5029 | if (ret) { |
66ea93b1 | 5030 | ERR("Failed to disable consumed-size notification in ROTATION_SET_SCHEDULE command"); |
90936dcf JD |
5031 | ret = LTTNG_ERR_UNK; |
5032 | goto end; | |
5033 | } | |
66ea93b1 | 5034 | |
90936dcf | 5035 | } |
66ea93b1 JG |
5036 | break; |
5037 | default: | |
5038 | /* Would have been caught before. */ | |
5039 | abort(); | |
90936dcf JD |
5040 | } |
5041 | ||
259c2674 JD |
5042 | ret = LTTNG_OK; |
5043 | ||
5044 | goto end; | |
5045 | ||
5046 | end: | |
5047 | return ret; | |
5048 | } | |
5049 | ||
a503e1ef JG |
5050 | /* Wait for a given path to be removed before continuing. */ |
5051 | static enum lttng_error_code wait_on_path(void *path_data) | |
5052 | { | |
5053 | const char *shm_path = path_data; | |
5054 | ||
5055 | DBG("Waiting for the shm path at %s to be removed before completing session destruction", | |
5056 | shm_path); | |
5057 | while (true) { | |
5058 | int ret; | |
5059 | struct stat st; | |
5060 | ||
5061 | ret = stat(shm_path, &st); | |
5062 | if (ret) { | |
5063 | if (errno != ENOENT) { | |
5064 | PERROR("stat() returned an error while checking for the existence of the shm path"); | |
5065 | } else { | |
5066 | DBG("shm path no longer exists, completing the destruction of session"); | |
5067 | } | |
5068 | break; | |
5069 | } else { | |
5070 | if (!S_ISDIR(st.st_mode)) { | |
5071 | ERR("The type of shm path %s returned by stat() is not a directory; aborting the wait for shm path removal", | |
5072 | shm_path); | |
5073 | break; | |
5074 | } | |
5075 | } | |
5076 | usleep(SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US); | |
5077 | } | |
5078 | return LTTNG_OK; | |
5079 | } | |
5080 | ||
5081 | /* | |
5082 | * Returns a pointer to a handler to run on completion of a command. | |
5083 | * Returns NULL if no handler has to be run for the last command executed. | |
5084 | */ | |
5085 | const struct cmd_completion_handler *cmd_pop_completion_handler(void) | |
5086 | { | |
5087 | struct cmd_completion_handler *handler = current_completion_handler; | |
5088 | ||
5089 | current_completion_handler = NULL; | |
5090 | return handler; | |
5091 | } | |
5092 | ||
2f77fc4b DG |
5093 | /* |
5094 | * Init command subsystem. | |
5095 | */ | |
5096 | void cmd_init(void) | |
5097 | { | |
5098 | /* | |
d88aee68 DG |
5099 | * Set network sequence index to 1 for streams to match a relayd |
5100 | * socket on the consumer side. | |
2f77fc4b | 5101 | */ |
d88aee68 DG |
5102 | pthread_mutex_lock(&relayd_net_seq_idx_lock); |
5103 | relayd_net_seq_idx = 1; | |
5104 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
5105 | |
5106 | DBG("Command subsystem initialized"); | |
5107 | } |