Commit | Line | Data |
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2f77fc4b DG |
1 | /* |
2 | * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com> | |
bdf64013 | 3 | * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
2f77fc4b DG |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License, version 2 only, as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
16 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | */ | |
18 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
2f77fc4b | 20 | #include <assert.h> |
6dc3064a | 21 | #include <inttypes.h> |
2f77fc4b DG |
22 | #include <urcu/list.h> |
23 | #include <urcu/uatomic.h> | |
a503e1ef | 24 | #include <sys/stat.h> |
2f77fc4b DG |
25 | |
26 | #include <common/defaults.h> | |
27 | #include <common/common.h> | |
28 | #include <common/sessiond-comm/sessiond-comm.h> | |
29 | #include <common/relayd/relayd.h> | |
10a50311 | 30 | #include <common/utils.h> |
f5436bfc | 31 | #include <common/compat/string.h> |
93ec662e | 32 | #include <common/kernel-ctl/kernel-ctl.h> |
b0880ae5 JG |
33 | #include <common/dynamic-buffer.h> |
34 | #include <common/buffer-view.h> | |
82b69413 | 35 | #include <common/trace-chunk.h> |
b0880ae5 JG |
36 | #include <lttng/trigger/trigger-internal.h> |
37 | #include <lttng/condition/condition.h> | |
38 | #include <lttng/action/action.h> | |
6e21424e | 39 | #include <lttng/channel.h> |
b0880ae5 | 40 | #include <lttng/channel-internal.h> |
5c408ad8 | 41 | #include <lttng/rotate-internal.h> |
17dd1232 | 42 | #include <lttng/location-internal.h> |
b178f53e | 43 | #include <lttng/session-internal.h> |
3c02e545 | 44 | #include <lttng/userspace-probe-internal.h> |
b178f53e | 45 | #include <lttng/session-descriptor-internal.h> |
9f449915 | 46 | #include <common/string-utils/string-utils.h> |
2f77fc4b DG |
47 | |
48 | #include "channel.h" | |
49 | #include "consumer.h" | |
50 | #include "event.h" | |
8782cc74 | 51 | #include "health-sessiond.h" |
2f77fc4b DG |
52 | #include "kernel.h" |
53 | #include "kernel-consumer.h" | |
54 | #include "lttng-sessiond.h" | |
55 | #include "utils.h" | |
0dbc2034 | 56 | #include "lttng-syscall.h" |
7c1d2758 | 57 | #include "agent.h" |
93ec662e | 58 | #include "buffer-registry.h" |
b0880ae5 JG |
59 | #include "notification-thread.h" |
60 | #include "notification-thread-commands.h" | |
5c408ad8 JD |
61 | #include "rotate.h" |
62 | #include "rotation-thread.h" | |
8e319828 | 63 | #include "timer.h" |
f28f9e44 | 64 | #include "agent-thread.h" |
2f77fc4b DG |
65 | |
66 | #include "cmd.h" | |
67 | ||
a503e1ef JG |
68 | /* Sleep for 100ms between each check for the shm path's deletion. */ |
69 | #define SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US 100000 | |
70 | ||
71 | static enum lttng_error_code wait_on_path(void *path); | |
72 | ||
73 | /* | |
74 | * Command completion handler that is used by the destroy command | |
75 | * when a session that has a non-default shm_path is being destroyed. | |
76 | * | |
77 | * See comment in cmd_destroy_session() for the rationale. | |
78 | */ | |
79 | static struct destroy_completion_handler { | |
80 | struct cmd_completion_handler handler; | |
81 | char shm_path[member_sizeof(struct ltt_session, shm_path)]; | |
82 | } destroy_completion_handler = { | |
83 | .handler = { | |
84 | .run = wait_on_path, | |
85 | .data = destroy_completion_handler.shm_path | |
86 | }, | |
87 | .shm_path = { 0 }, | |
88 | }; | |
89 | ||
90 | static struct cmd_completion_handler *current_completion_handler; | |
91 | ||
2f77fc4b DG |
92 | /* |
93 | * Used to keep a unique index for each relayd socket created where this value | |
94 | * is associated with streams on the consumer so it can match the right relayd | |
d88aee68 DG |
95 | * to send to. It must be accessed with the relayd_net_seq_idx_lock |
96 | * held. | |
2f77fc4b | 97 | */ |
d88aee68 DG |
98 | static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER; |
99 | static uint64_t relayd_net_seq_idx; | |
2f77fc4b | 100 | |
7076b56e JG |
101 | static int validate_ust_event_name(const char *); |
102 | static int cmd_enable_event_internal(struct ltt_session *session, | |
103 | struct lttng_domain *domain, | |
104 | char *channel_name, struct lttng_event *event, | |
105 | char *filter_expression, | |
106 | struct lttng_filter_bytecode *filter, | |
107 | struct lttng_event_exclusion *exclusion, | |
108 | int wpipe); | |
109 | ||
2f77fc4b DG |
110 | /* |
111 | * Create a session path used by list_lttng_sessions for the case that the | |
112 | * session consumer is on the network. | |
113 | */ | |
114 | static int build_network_session_path(char *dst, size_t size, | |
115 | struct ltt_session *session) | |
116 | { | |
117 | int ret, kdata_port, udata_port; | |
118 | struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL; | |
119 | char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX]; | |
120 | ||
121 | assert(session); | |
122 | assert(dst); | |
123 | ||
124 | memset(tmp_urls, 0, sizeof(tmp_urls)); | |
125 | memset(tmp_uurl, 0, sizeof(tmp_uurl)); | |
126 | ||
127 | kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT; | |
128 | ||
129 | if (session->kernel_session && session->kernel_session->consumer) { | |
130 | kuri = &session->kernel_session->consumer->dst.net.control; | |
131 | kdata_port = session->kernel_session->consumer->dst.net.data.port; | |
132 | } | |
133 | ||
134 | if (session->ust_session && session->ust_session->consumer) { | |
135 | uuri = &session->ust_session->consumer->dst.net.control; | |
136 | udata_port = session->ust_session->consumer->dst.net.data.port; | |
137 | } | |
138 | ||
139 | if (uuri == NULL && kuri == NULL) { | |
140 | uri = &session->consumer->dst.net.control; | |
141 | kdata_port = session->consumer->dst.net.data.port; | |
142 | } else if (kuri && uuri) { | |
143 | ret = uri_compare(kuri, uuri); | |
144 | if (ret) { | |
145 | /* Not Equal */ | |
146 | uri = kuri; | |
147 | /* Build uuri URL string */ | |
148 | ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl)); | |
149 | if (ret < 0) { | |
150 | goto error; | |
151 | } | |
152 | } else { | |
153 | uri = kuri; | |
154 | } | |
155 | } else if (kuri && uuri == NULL) { | |
156 | uri = kuri; | |
157 | } else if (uuri && kuri == NULL) { | |
158 | uri = uuri; | |
159 | } | |
160 | ||
161 | ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls)); | |
162 | if (ret < 0) { | |
163 | goto error; | |
164 | } | |
165 | ||
9aa9f900 DG |
166 | /* |
167 | * Do we have a UST url set. If yes, this means we have both kernel and UST | |
168 | * to print. | |
169 | */ | |
9d035200 | 170 | if (*tmp_uurl != '\0') { |
2f77fc4b DG |
171 | ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]", |
172 | tmp_urls, kdata_port, tmp_uurl, udata_port); | |
173 | } else { | |
9aa9f900 | 174 | int dport; |
bef08707 | 175 | if (kuri || (!kuri && !uuri)) { |
9aa9f900 DG |
176 | dport = kdata_port; |
177 | } else { | |
178 | /* No kernel URI, use the UST port. */ | |
179 | dport = udata_port; | |
180 | } | |
181 | ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport); | |
2f77fc4b DG |
182 | } |
183 | ||
184 | error: | |
185 | return ret; | |
186 | } | |
187 | ||
fb83fe64 JD |
188 | /* |
189 | * Get run-time attributes if the session has been started (discarded events, | |
190 | * lost packets). | |
191 | */ | |
192 | static int get_kernel_runtime_stats(struct ltt_session *session, | |
193 | struct ltt_kernel_channel *kchan, uint64_t *discarded_events, | |
194 | uint64_t *lost_packets) | |
195 | { | |
196 | int ret; | |
197 | ||
198 | if (!session->has_been_started) { | |
199 | ret = 0; | |
200 | *discarded_events = 0; | |
201 | *lost_packets = 0; | |
202 | goto end; | |
203 | } | |
204 | ||
e1f3997a | 205 | ret = consumer_get_discarded_events(session->id, kchan->key, |
fb83fe64 JD |
206 | session->kernel_session->consumer, |
207 | discarded_events); | |
208 | if (ret < 0) { | |
209 | goto end; | |
210 | } | |
211 | ||
e1f3997a | 212 | ret = consumer_get_lost_packets(session->id, kchan->key, |
fb83fe64 JD |
213 | session->kernel_session->consumer, |
214 | lost_packets); | |
215 | if (ret < 0) { | |
216 | goto end; | |
217 | } | |
218 | ||
219 | end: | |
220 | return ret; | |
221 | } | |
222 | ||
223 | /* | |
224 | * Get run-time attributes if the session has been started (discarded events, | |
225 | * lost packets). | |
226 | */ | |
227 | static int get_ust_runtime_stats(struct ltt_session *session, | |
228 | struct ltt_ust_channel *uchan, uint64_t *discarded_events, | |
229 | uint64_t *lost_packets) | |
230 | { | |
231 | int ret; | |
232 | struct ltt_ust_session *usess; | |
233 | ||
a91c5803 JG |
234 | if (!discarded_events || !lost_packets) { |
235 | ret = -1; | |
236 | goto end; | |
237 | } | |
238 | ||
fb83fe64 | 239 | usess = session->ust_session; |
a905c624 JG |
240 | assert(discarded_events); |
241 | assert(lost_packets); | |
fb83fe64 JD |
242 | |
243 | if (!usess || !session->has_been_started) { | |
244 | *discarded_events = 0; | |
245 | *lost_packets = 0; | |
246 | ret = 0; | |
247 | goto end; | |
248 | } | |
249 | ||
250 | if (usess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
251 | ret = ust_app_uid_get_channel_runtime_stats(usess->id, | |
252 | &usess->buffer_reg_uid_list, | |
253 | usess->consumer, uchan->id, | |
254 | uchan->attr.overwrite, | |
255 | discarded_events, | |
256 | lost_packets); | |
257 | } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
258 | ret = ust_app_pid_get_channel_runtime_stats(usess, | |
259 | uchan, usess->consumer, | |
260 | uchan->attr.overwrite, | |
261 | discarded_events, | |
262 | lost_packets); | |
263 | if (ret < 0) { | |
264 | goto end; | |
265 | } | |
266 | *discarded_events += uchan->per_pid_closed_app_discarded; | |
267 | *lost_packets += uchan->per_pid_closed_app_lost; | |
268 | } else { | |
269 | ERR("Unsupported buffer type"); | |
967bc289 | 270 | assert(0); |
fb83fe64 JD |
271 | ret = -1; |
272 | goto end; | |
273 | } | |
274 | ||
275 | end: | |
276 | return ret; | |
277 | } | |
278 | ||
2f77fc4b DG |
279 | /* |
280 | * Fill lttng_channel array of all channels. | |
281 | */ | |
d449df4a | 282 | static ssize_t list_lttng_channels(enum lttng_domain_type domain, |
fb83fe64 | 283 | struct ltt_session *session, struct lttng_channel *channels, |
cf0bcb51 | 284 | struct lttng_channel_extended *chan_exts) |
2f77fc4b | 285 | { |
d449df4a | 286 | int i = 0, ret = 0; |
2f77fc4b DG |
287 | struct ltt_kernel_channel *kchan; |
288 | ||
289 | DBG("Listing channels for session %s", session->name); | |
290 | ||
291 | switch (domain) { | |
292 | case LTTNG_DOMAIN_KERNEL: | |
293 | /* Kernel channels */ | |
294 | if (session->kernel_session != NULL) { | |
295 | cds_list_for_each_entry(kchan, | |
296 | &session->kernel_session->channel_list.head, list) { | |
fb83fe64 | 297 | uint64_t discarded_events, lost_packets; |
cf0bcb51 JG |
298 | struct lttng_channel_extended *extended; |
299 | ||
300 | extended = (struct lttng_channel_extended *) | |
301 | kchan->channel->attr.extended.ptr; | |
fb83fe64 JD |
302 | |
303 | ret = get_kernel_runtime_stats(session, kchan, | |
304 | &discarded_events, &lost_packets); | |
305 | if (ret < 0) { | |
306 | goto end; | |
307 | } | |
2f77fc4b DG |
308 | /* Copy lttng_channel struct to array */ |
309 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
310 | channels[i].enabled = kchan->enabled; | |
fb83fe64 JD |
311 | chan_exts[i].discarded_events = |
312 | discarded_events; | |
313 | chan_exts[i].lost_packets = lost_packets; | |
cf0bcb51 JG |
314 | chan_exts[i].monitor_timer_interval = |
315 | extended->monitor_timer_interval; | |
491d1539 | 316 | chan_exts[i].blocking_timeout = 0; |
2f77fc4b DG |
317 | i++; |
318 | } | |
319 | } | |
320 | break; | |
321 | case LTTNG_DOMAIN_UST: | |
322 | { | |
323 | struct lttng_ht_iter iter; | |
324 | struct ltt_ust_channel *uchan; | |
325 | ||
e7fe706f | 326 | rcu_read_lock(); |
2f77fc4b DG |
327 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
328 | &iter.iter, uchan, node.node) { | |
a91c5803 | 329 | uint64_t discarded_events = 0, lost_packets = 0; |
fb83fe64 | 330 | |
8ee609c8 MD |
331 | if (lttng_strncpy(channels[i].name, uchan->name, |
332 | LTTNG_SYMBOL_NAME_LEN)) { | |
333 | break; | |
334 | } | |
2f77fc4b DG |
335 | channels[i].attr.overwrite = uchan->attr.overwrite; |
336 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
337 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
338 | channels[i].attr.switch_timer_interval = | |
339 | uchan->attr.switch_timer_interval; | |
340 | channels[i].attr.read_timer_interval = | |
341 | uchan->attr.read_timer_interval; | |
342 | channels[i].enabled = uchan->enabled; | |
2f785fe7 DG |
343 | channels[i].attr.tracefile_size = uchan->tracefile_size; |
344 | channels[i].attr.tracefile_count = uchan->tracefile_count; | |
5e4435a4 JG |
345 | |
346 | /* | |
347 | * Map enum lttng_ust_output to enum lttng_event_output. | |
348 | */ | |
2f77fc4b DG |
349 | switch (uchan->attr.output) { |
350 | case LTTNG_UST_MMAP: | |
2f77fc4b DG |
351 | channels[i].attr.output = LTTNG_EVENT_MMAP; |
352 | break; | |
5e4435a4 JG |
353 | default: |
354 | /* | |
355 | * LTTNG_UST_MMAP is the only supported UST | |
356 | * output mode. | |
357 | */ | |
358 | assert(0); | |
359 | break; | |
2f77fc4b | 360 | } |
fb83fe64 | 361 | |
d449df4a MD |
362 | chan_exts[i].monitor_timer_interval = |
363 | uchan->monitor_timer_interval; | |
491d1539 MD |
364 | chan_exts[i].blocking_timeout = |
365 | uchan->attr.u.s.blocking_timeout; | |
d449df4a | 366 | |
fb83fe64 JD |
367 | ret = get_ust_runtime_stats(session, uchan, |
368 | &discarded_events, &lost_packets); | |
369 | if (ret < 0) { | |
370 | break; | |
371 | } | |
372 | chan_exts[i].discarded_events = discarded_events; | |
373 | chan_exts[i].lost_packets = lost_packets; | |
2f77fc4b DG |
374 | i++; |
375 | } | |
e7fe706f | 376 | rcu_read_unlock(); |
2f77fc4b DG |
377 | break; |
378 | } | |
379 | default: | |
380 | break; | |
381 | } | |
fb83fe64 JD |
382 | |
383 | end: | |
d449df4a MD |
384 | if (ret < 0) { |
385 | return -LTTNG_ERR_FATAL; | |
386 | } else { | |
387 | return LTTNG_OK; | |
388 | } | |
2f77fc4b DG |
389 | } |
390 | ||
3c02e545 FD |
391 | static int increment_extended_len(const char *filter_expression, |
392 | struct lttng_event_exclusion *exclusion, | |
393 | const struct lttng_userspace_probe_location *probe_location, | |
394 | size_t *extended_len) | |
b4e3ceb9 | 395 | { |
3c02e545 FD |
396 | int ret = 0; |
397 | ||
b4e3ceb9 PP |
398 | *extended_len += sizeof(struct lttcomm_event_extended_header); |
399 | ||
400 | if (filter_expression) { | |
401 | *extended_len += strlen(filter_expression) + 1; | |
402 | } | |
795d57ce PP |
403 | |
404 | if (exclusion) { | |
405 | *extended_len += exclusion->count * LTTNG_SYMBOL_NAME_LEN; | |
406 | } | |
3c02e545 FD |
407 | |
408 | if (probe_location) { | |
409 | ret = lttng_userspace_probe_location_serialize(probe_location, | |
410 | NULL, NULL); | |
411 | if (ret < 0) { | |
412 | goto end; | |
413 | } | |
414 | *extended_len += ret; | |
415 | } | |
416 | ret = 0; | |
417 | end: | |
418 | return ret; | |
b4e3ceb9 PP |
419 | } |
420 | ||
3c02e545 FD |
421 | static int append_extended_info(const char *filter_expression, |
422 | struct lttng_event_exclusion *exclusion, | |
423 | struct lttng_userspace_probe_location *probe_location, | |
424 | void **extended_at) | |
b4e3ceb9 | 425 | { |
3c02e545 | 426 | int ret = 0; |
b4e3ceb9 | 427 | size_t filter_len = 0; |
795d57ce | 428 | size_t nb_exclusions = 0; |
3c02e545 FD |
429 | size_t userspace_probe_location_len = 0; |
430 | struct lttng_dynamic_buffer location_buffer; | |
431 | struct lttcomm_event_extended_header extended_header; | |
b4e3ceb9 PP |
432 | |
433 | if (filter_expression) { | |
434 | filter_len = strlen(filter_expression) + 1; | |
435 | } | |
436 | ||
795d57ce PP |
437 | if (exclusion) { |
438 | nb_exclusions = exclusion->count; | |
439 | } | |
440 | ||
3c02e545 FD |
441 | if (probe_location) { |
442 | lttng_dynamic_buffer_init(&location_buffer); | |
443 | ret = lttng_userspace_probe_location_serialize(probe_location, | |
444 | &location_buffer, NULL); | |
445 | if (ret < 0) { | |
446 | ret = -1; | |
447 | goto end; | |
448 | } | |
449 | userspace_probe_location_len = location_buffer.size; | |
450 | } | |
451 | ||
795d57ce | 452 | /* Set header fields */ |
b4e3ceb9 | 453 | extended_header.filter_len = filter_len; |
795d57ce | 454 | extended_header.nb_exclusions = nb_exclusions; |
3c02e545 | 455 | extended_header.userspace_probe_location_len = userspace_probe_location_len; |
795d57ce PP |
456 | |
457 | /* Copy header */ | |
b4e3ceb9 PP |
458 | memcpy(*extended_at, &extended_header, sizeof(extended_header)); |
459 | *extended_at += sizeof(extended_header); | |
795d57ce PP |
460 | |
461 | /* Copy filter string */ | |
462 | if (filter_expression) { | |
463 | memcpy(*extended_at, filter_expression, filter_len); | |
464 | *extended_at += filter_len; | |
465 | } | |
466 | ||
467 | /* Copy exclusion names */ | |
468 | if (exclusion) { | |
469 | size_t len = nb_exclusions * LTTNG_SYMBOL_NAME_LEN; | |
470 | ||
471 | memcpy(*extended_at, &exclusion->names, len); | |
472 | *extended_at += len; | |
473 | } | |
3c02e545 FD |
474 | |
475 | if (probe_location) { | |
476 | memcpy(*extended_at, location_buffer.data, location_buffer.size); | |
477 | *extended_at += location_buffer.size; | |
478 | lttng_dynamic_buffer_reset(&location_buffer); | |
479 | } | |
480 | ret = 0; | |
481 | end: | |
482 | return ret; | |
b4e3ceb9 PP |
483 | } |
484 | ||
3c6a091f | 485 | /* |
022d91ba | 486 | * Create a list of agent domain events. |
3c6a091f DG |
487 | * |
488 | * Return number of events in list on success or else a negative value. | |
489 | */ | |
022d91ba | 490 | static int list_lttng_agent_events(struct agent *agt, |
b4e3ceb9 | 491 | struct lttng_event **events, size_t *total_size) |
3c6a091f DG |
492 | { |
493 | int i = 0, ret = 0; | |
494 | unsigned int nb_event = 0; | |
022d91ba | 495 | struct agent_event *event; |
47e52862 | 496 | struct lttng_event *tmp_events = NULL; |
3c6a091f | 497 | struct lttng_ht_iter iter; |
b4e3ceb9 PP |
498 | size_t extended_len = 0; |
499 | void *extended_at; | |
3c6a091f | 500 | |
022d91ba | 501 | assert(agt); |
3c6a091f DG |
502 | assert(events); |
503 | ||
022d91ba | 504 | DBG3("Listing agent events"); |
3c6a091f | 505 | |
e5bbf678 | 506 | rcu_read_lock(); |
022d91ba | 507 | nb_event = lttng_ht_get_count(agt->events); |
e5bbf678 | 508 | rcu_read_unlock(); |
3c6a091f DG |
509 | if (nb_event == 0) { |
510 | ret = nb_event; | |
b4e3ceb9 | 511 | *total_size = 0; |
3c6a091f DG |
512 | goto error; |
513 | } | |
514 | ||
b4e3ceb9 PP |
515 | /* Compute required extended infos size */ |
516 | extended_len = nb_event * sizeof(struct lttcomm_event_extended_header); | |
517 | ||
518 | /* | |
519 | * This is only valid because the commands which add events are | |
520 | * processed in the same thread as the listing. | |
521 | */ | |
522 | rcu_read_lock(); | |
523 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { | |
3c02e545 | 524 | ret = increment_extended_len(event->filter_expression, NULL, NULL, |
795d57ce | 525 | &extended_len); |
3c02e545 FD |
526 | if (ret) { |
527 | DBG("Error computing the length of extended info message"); | |
528 | ret = -LTTNG_ERR_FATAL; | |
529 | goto error; | |
530 | } | |
b4e3ceb9 PP |
531 | } |
532 | rcu_read_unlock(); | |
533 | ||
534 | *total_size = nb_event * sizeof(*tmp_events) + extended_len; | |
535 | tmp_events = zmalloc(*total_size); | |
3c6a091f | 536 | if (!tmp_events) { |
022d91ba | 537 | PERROR("zmalloc agent events session"); |
3c6a091f DG |
538 | ret = -LTTNG_ERR_FATAL; |
539 | goto error; | |
540 | } | |
541 | ||
b4e3ceb9 PP |
542 | extended_at = ((uint8_t *) tmp_events) + |
543 | nb_event * sizeof(struct lttng_event); | |
544 | ||
3c6a091f | 545 | rcu_read_lock(); |
022d91ba | 546 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
3c6a091f DG |
547 | strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name)); |
548 | tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0'; | |
549 | tmp_events[i].enabled = event->enabled; | |
2106efa0 | 550 | tmp_events[i].loglevel = event->loglevel_value; |
ff94328f | 551 | tmp_events[i].loglevel_type = event->loglevel_type; |
3c6a091f | 552 | i++; |
b4e3ceb9 PP |
553 | |
554 | /* Append extended info */ | |
3c02e545 | 555 | ret = append_extended_info(event->filter_expression, NULL, NULL, |
795d57ce | 556 | &extended_at); |
3c02e545 FD |
557 | if (ret) { |
558 | DBG("Error appending extended info message"); | |
559 | ret = -LTTNG_ERR_FATAL; | |
560 | goto error; | |
561 | } | |
3c6a091f | 562 | } |
3c6a091f DG |
563 | |
564 | *events = tmp_events; | |
565 | ret = nb_event; | |
3c02e545 | 566 | assert(nb_event == i); |
3c6a091f | 567 | |
47e52862 | 568 | end: |
3c02e545 | 569 | rcu_read_unlock(); |
3c6a091f | 570 | return ret; |
47e52862 JG |
571 | error: |
572 | free(tmp_events); | |
573 | goto end; | |
3c6a091f DG |
574 | } |
575 | ||
2f77fc4b DG |
576 | /* |
577 | * Create a list of ust global domain events. | |
578 | */ | |
579 | static int list_lttng_ust_global_events(char *channel_name, | |
b4e3ceb9 PP |
580 | struct ltt_ust_domain_global *ust_global, |
581 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
582 | { |
583 | int i = 0, ret = 0; | |
584 | unsigned int nb_event = 0; | |
585 | struct lttng_ht_iter iter; | |
586 | struct lttng_ht_node_str *node; | |
587 | struct ltt_ust_channel *uchan; | |
588 | struct ltt_ust_event *uevent; | |
589 | struct lttng_event *tmp; | |
b4e3ceb9 PP |
590 | size_t extended_len = 0; |
591 | void *extended_at; | |
2f77fc4b DG |
592 | |
593 | DBG("Listing UST global events for channel %s", channel_name); | |
594 | ||
595 | rcu_read_lock(); | |
596 | ||
597 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); | |
598 | node = lttng_ht_iter_get_node_str(&iter); | |
599 | if (node == NULL) { | |
f73fabfd | 600 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
d31d3e8c | 601 | goto end; |
2f77fc4b DG |
602 | } |
603 | ||
604 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); | |
605 | ||
3c442be3 | 606 | nb_event = lttng_ht_get_count(uchan->events); |
2f77fc4b DG |
607 | if (nb_event == 0) { |
608 | ret = nb_event; | |
b4e3ceb9 | 609 | *total_size = 0; |
d31d3e8c | 610 | goto end; |
2f77fc4b DG |
611 | } |
612 | ||
613 | DBG3("Listing UST global %d events", nb_event); | |
614 | ||
b4e3ceb9 PP |
615 | /* Compute required extended infos size */ |
616 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { | |
617 | if (uevent->internal) { | |
618 | nb_event--; | |
619 | continue; | |
620 | } | |
621 | ||
3c02e545 FD |
622 | ret = increment_extended_len(uevent->filter_expression, |
623 | uevent->exclusion, NULL, &extended_len); | |
624 | if (ret) { | |
625 | DBG("Error computing the length of extended info message"); | |
626 | ret = -LTTNG_ERR_FATAL; | |
627 | goto end; | |
628 | } | |
b4e3ceb9 | 629 | } |
d31d3e8c PP |
630 | if (nb_event == 0) { |
631 | /* All events are internal, skip. */ | |
632 | ret = 0; | |
633 | *total_size = 0; | |
634 | goto end; | |
635 | } | |
b4e3ceb9 PP |
636 | |
637 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
638 | tmp = zmalloc(*total_size); | |
2f77fc4b | 639 | if (tmp == NULL) { |
b12c38df JG |
640 | ret = -LTTNG_ERR_FATAL; |
641 | goto end; | |
2f77fc4b DG |
642 | } |
643 | ||
b4e3ceb9 PP |
644 | extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event); |
645 | ||
2f77fc4b | 646 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
3c442be3 JG |
647 | if (uevent->internal) { |
648 | /* This event should remain hidden from clients */ | |
3c442be3 JG |
649 | continue; |
650 | } | |
2f77fc4b DG |
651 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
652 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
653 | tmp[i].enabled = uevent->enabled; | |
654 | ||
655 | switch (uevent->attr.instrumentation) { | |
656 | case LTTNG_UST_TRACEPOINT: | |
657 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
658 | break; | |
659 | case LTTNG_UST_PROBE: | |
660 | tmp[i].type = LTTNG_EVENT_PROBE; | |
661 | break; | |
662 | case LTTNG_UST_FUNCTION: | |
663 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
664 | break; | |
665 | } | |
666 | ||
667 | tmp[i].loglevel = uevent->attr.loglevel; | |
668 | switch (uevent->attr.loglevel_type) { | |
669 | case LTTNG_UST_LOGLEVEL_ALL: | |
670 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
671 | break; | |
672 | case LTTNG_UST_LOGLEVEL_RANGE: | |
673 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; | |
674 | break; | |
675 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
676 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; | |
677 | break; | |
678 | } | |
679 | if (uevent->filter) { | |
680 | tmp[i].filter = 1; | |
681 | } | |
4634f12e JI |
682 | if (uevent->exclusion) { |
683 | tmp[i].exclusion = 1; | |
684 | } | |
2f77fc4b | 685 | i++; |
b4e3ceb9 PP |
686 | |
687 | /* Append extended info */ | |
3c02e545 FD |
688 | ret = append_extended_info(uevent->filter_expression, |
689 | uevent->exclusion, NULL, &extended_at); | |
690 | if (ret) { | |
691 | DBG("Error appending extended info message"); | |
692 | ret = -LTTNG_ERR_FATAL; | |
693 | goto end; | |
694 | } | |
2f77fc4b DG |
695 | } |
696 | ||
697 | ret = nb_event; | |
698 | *events = tmp; | |
d31d3e8c | 699 | end: |
2f77fc4b DG |
700 | rcu_read_unlock(); |
701 | return ret; | |
702 | } | |
703 | ||
704 | /* | |
705 | * Fill lttng_event array of all kernel events in the channel. | |
706 | */ | |
707 | static int list_lttng_kernel_events(char *channel_name, | |
b4e3ceb9 PP |
708 | struct ltt_kernel_session *kernel_session, |
709 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
710 | { |
711 | int i = 0, ret; | |
712 | unsigned int nb_event; | |
713 | struct ltt_kernel_event *event; | |
714 | struct ltt_kernel_channel *kchan; | |
b4e3ceb9 PP |
715 | size_t extended_len = 0; |
716 | void *extended_at; | |
2f77fc4b DG |
717 | |
718 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
719 | if (kchan == NULL) { | |
f73fabfd | 720 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
721 | goto error; |
722 | } | |
723 | ||
724 | nb_event = kchan->event_count; | |
725 | ||
726 | DBG("Listing events for channel %s", kchan->channel->name); | |
727 | ||
728 | if (nb_event == 0) { | |
b4e3ceb9 | 729 | *total_size = 0; |
834978fd | 730 | *events = NULL; |
db906c12 | 731 | goto end; |
2f77fc4b DG |
732 | } |
733 | ||
b4e3ceb9 PP |
734 | /* Compute required extended infos size */ |
735 | cds_list_for_each_entry(event, &kchan->events_list.head, list) { | |
3c02e545 FD |
736 | ret = increment_extended_len(event->filter_expression, NULL, |
737 | event->userspace_probe_location, | |
795d57ce | 738 | &extended_len); |
3c02e545 FD |
739 | if (ret) { |
740 | DBG("Error computing the length of extended info message"); | |
741 | ret = -LTTNG_ERR_FATAL; | |
742 | goto error; | |
743 | } | |
b4e3ceb9 PP |
744 | } |
745 | ||
746 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
747 | *events = zmalloc(*total_size); | |
2f77fc4b | 748 | if (*events == NULL) { |
3c02e545 | 749 | ret = -LTTNG_ERR_FATAL; |
2f77fc4b DG |
750 | goto error; |
751 | } | |
752 | ||
ab4aa612 | 753 | extended_at = ((void *) *events) + |
b4e3ceb9 PP |
754 | nb_event * sizeof(struct lttng_event); |
755 | ||
2f77fc4b DG |
756 | /* Kernel channels */ |
757 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
758 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
759 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
760 | (*events)[i].enabled = event->enabled; | |
00f992f2 JG |
761 | (*events)[i].filter = |
762 | (unsigned char) !!event->filter_expression; | |
2f77fc4b DG |
763 | |
764 | switch (event->event->instrumentation) { | |
765 | case LTTNG_KERNEL_TRACEPOINT: | |
766 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; | |
767 | break; | |
2f77fc4b | 768 | case LTTNG_KERNEL_KRETPROBE: |
1896972b DG |
769 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
770 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
771 | sizeof(struct lttng_kernel_kprobe)); | |
772 | break; | |
773 | case LTTNG_KERNEL_KPROBE: | |
2f77fc4b DG |
774 | (*events)[i].type = LTTNG_EVENT_PROBE; |
775 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
776 | sizeof(struct lttng_kernel_kprobe)); | |
777 | break; | |
b955b4d4 FD |
778 | case LTTNG_KERNEL_UPROBE: |
779 | (*events)[i].type = LTTNG_EVENT_USERSPACE_PROBE; | |
780 | break; | |
2f77fc4b DG |
781 | case LTTNG_KERNEL_FUNCTION: |
782 | (*events)[i].type = LTTNG_EVENT_FUNCTION; | |
783 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
784 | sizeof(struct lttng_kernel_function)); | |
785 | break; | |
786 | case LTTNG_KERNEL_NOOP: | |
787 | (*events)[i].type = LTTNG_EVENT_NOOP; | |
788 | break; | |
789 | case LTTNG_KERNEL_SYSCALL: | |
790 | (*events)[i].type = LTTNG_EVENT_SYSCALL; | |
791 | break; | |
792 | case LTTNG_KERNEL_ALL: | |
1ab8c2ad FD |
793 | /* fall-through. */ |
794 | default: | |
2f77fc4b DG |
795 | assert(0); |
796 | break; | |
797 | } | |
798 | i++; | |
b4e3ceb9 PP |
799 | |
800 | /* Append extended info */ | |
3c02e545 FD |
801 | ret = append_extended_info(event->filter_expression, NULL, |
802 | event->userspace_probe_location, &extended_at); | |
803 | if (ret) { | |
804 | DBG("Error appending extended info message"); | |
805 | ret = -LTTNG_ERR_FATAL; | |
806 | goto error; | |
807 | } | |
2f77fc4b DG |
808 | } |
809 | ||
db906c12 | 810 | end: |
2f77fc4b DG |
811 | return nb_event; |
812 | ||
813 | error: | |
f73fabfd DG |
814 | /* Negate the error code to differentiate the size from an error */ |
815 | return -ret; | |
2f77fc4b DG |
816 | } |
817 | ||
818 | /* | |
819 | * Add URI so the consumer output object. Set the correct path depending on the | |
820 | * domain adding the default trace directory. | |
821 | */ | |
b178f53e JG |
822 | static enum lttng_error_code add_uri_to_consumer( |
823 | const struct ltt_session *session, | |
824 | struct consumer_output *consumer, | |
825 | struct lttng_uri *uri, enum lttng_domain_type domain) | |
2f77fc4b | 826 | { |
b178f53e JG |
827 | int ret; |
828 | enum lttng_error_code ret_code = LTTNG_OK; | |
2f77fc4b DG |
829 | |
830 | assert(uri); | |
831 | ||
832 | if (consumer == NULL) { | |
833 | DBG("No consumer detected. Don't add URI. Stopping."); | |
b178f53e | 834 | ret_code = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
835 | goto error; |
836 | } | |
837 | ||
838 | switch (domain) { | |
839 | case LTTNG_DOMAIN_KERNEL: | |
b178f53e JG |
840 | ret = lttng_strncpy(consumer->domain_subdir, |
841 | DEFAULT_KERNEL_TRACE_DIR, | |
842 | sizeof(consumer->domain_subdir)); | |
2f77fc4b DG |
843 | break; |
844 | case LTTNG_DOMAIN_UST: | |
b178f53e JG |
845 | ret = lttng_strncpy(consumer->domain_subdir, |
846 | DEFAULT_UST_TRACE_DIR, | |
847 | sizeof(consumer->domain_subdir)); | |
2f77fc4b DG |
848 | break; |
849 | default: | |
850 | /* | |
b178f53e JG |
851 | * This case is possible is we try to add the URI to the global |
852 | * tracing session consumer object which in this case there is | |
853 | * no subdir. | |
2f77fc4b | 854 | */ |
b178f53e JG |
855 | memset(consumer->domain_subdir, 0, |
856 | sizeof(consumer->domain_subdir)); | |
857 | ret = 0; | |
858 | } | |
859 | if (ret) { | |
860 | ERR("Failed to initialize consumer output domain subdirectory"); | |
861 | ret_code = LTTNG_ERR_FATAL; | |
862 | goto error; | |
2f77fc4b DG |
863 | } |
864 | ||
865 | switch (uri->dtype) { | |
866 | case LTTNG_DST_IPV4: | |
867 | case LTTNG_DST_IPV6: | |
868 | DBG2("Setting network URI to consumer"); | |
869 | ||
df75acac DG |
870 | if (consumer->type == CONSUMER_DST_NET) { |
871 | if ((uri->stype == LTTNG_STREAM_CONTROL && | |
785d2d0d DG |
872 | consumer->dst.net.control_isset) || |
873 | (uri->stype == LTTNG_STREAM_DATA && | |
874 | consumer->dst.net.data_isset)) { | |
b178f53e | 875 | ret_code = LTTNG_ERR_URL_EXIST; |
df75acac DG |
876 | goto error; |
877 | } | |
878 | } else { | |
b178f53e | 879 | memset(&consumer->dst, 0, sizeof(consumer->dst)); |
785d2d0d DG |
880 | } |
881 | ||
2f77fc4b | 882 | /* Set URI into consumer output object */ |
b178f53e | 883 | ret = consumer_set_network_uri(session, consumer, uri); |
2f77fc4b | 884 | if (ret < 0) { |
b178f53e | 885 | ret_code = -ret; |
2f77fc4b DG |
886 | goto error; |
887 | } else if (ret == 1) { | |
888 | /* | |
889 | * URI was the same in the consumer so we do not append the subdir | |
890 | * again so to not duplicate output dir. | |
891 | */ | |
b178f53e | 892 | ret_code = LTTNG_OK; |
2f77fc4b DG |
893 | goto error; |
894 | } | |
2f77fc4b DG |
895 | break; |
896 | case LTTNG_DST_PATH: | |
b178f53e JG |
897 | if (*uri->dst.path != '/' || strstr(uri->dst.path, "../")) { |
898 | ret_code = LTTNG_ERR_INVALID; | |
9ac05d92 MD |
899 | goto error; |
900 | } | |
b178f53e JG |
901 | DBG2("Setting trace directory path from URI to %s", |
902 | uri->dst.path); | |
903 | memset(&consumer->dst, 0, sizeof(consumer->dst)); | |
904 | ||
905 | ret = lttng_strncpy(consumer->dst.session_root_path, | |
906 | uri->dst.path, | |
907 | sizeof(consumer->dst.session_root_path)); | |
2f77fc4b DG |
908 | consumer->type = CONSUMER_DST_LOCAL; |
909 | break; | |
910 | } | |
911 | ||
b178f53e | 912 | ret_code = LTTNG_OK; |
2f77fc4b | 913 | error: |
b178f53e | 914 | return ret_code; |
2f77fc4b DG |
915 | } |
916 | ||
917 | /* | |
918 | * Init tracing by creating trace directory and sending fds kernel consumer. | |
919 | */ | |
920 | static int init_kernel_tracing(struct ltt_kernel_session *session) | |
921 | { | |
922 | int ret = 0; | |
923 | struct lttng_ht_iter iter; | |
924 | struct consumer_socket *socket; | |
925 | ||
926 | assert(session); | |
927 | ||
e7fe706f DG |
928 | rcu_read_lock(); |
929 | ||
2f77fc4b DG |
930 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { |
931 | cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter, | |
932 | socket, node.node) { | |
2f77fc4b | 933 | pthread_mutex_lock(socket->lock); |
f50f23d9 | 934 | ret = kernel_consumer_send_session(socket, session); |
2f77fc4b DG |
935 | pthread_mutex_unlock(socket->lock); |
936 | if (ret < 0) { | |
f73fabfd | 937 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
938 | goto error; |
939 | } | |
940 | } | |
941 | } | |
942 | ||
943 | error: | |
e7fe706f | 944 | rcu_read_unlock(); |
2f77fc4b DG |
945 | return ret; |
946 | } | |
947 | ||
948 | /* | |
949 | * Create a socket to the relayd using the URI. | |
950 | * | |
951 | * On success, the relayd_sock pointer is set to the created socket. | |
9a654598 | 952 | * Else, it remains untouched and an LTTng error code is returned. |
2f77fc4b | 953 | */ |
9a654598 | 954 | static enum lttng_error_code create_connect_relayd(struct lttng_uri *uri, |
b31610f2 JD |
955 | struct lttcomm_relayd_sock **relayd_sock, |
956 | struct consumer_output *consumer) | |
2f77fc4b DG |
957 | { |
958 | int ret; | |
9a654598 | 959 | enum lttng_error_code status = LTTNG_OK; |
6151a90f | 960 | struct lttcomm_relayd_sock *rsock; |
2f77fc4b | 961 | |
6151a90f JD |
962 | rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR, |
963 | RELAYD_VERSION_COMM_MINOR); | |
964 | if (!rsock) { | |
9a654598 | 965 | status = LTTNG_ERR_FATAL; |
2f77fc4b DG |
966 | goto error; |
967 | } | |
968 | ||
ffe60014 DG |
969 | /* |
970 | * Connect to relayd so we can proceed with a session creation. This call | |
971 | * can possibly block for an arbitrary amount of time to set the health | |
972 | * state to be in poll execution. | |
973 | */ | |
974 | health_poll_entry(); | |
6151a90f | 975 | ret = relayd_connect(rsock); |
ffe60014 | 976 | health_poll_exit(); |
2f77fc4b DG |
977 | if (ret < 0) { |
978 | ERR("Unable to reach lttng-relayd"); | |
9a654598 | 979 | status = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
980 | goto free_sock; |
981 | } | |
982 | ||
983 | /* Create socket for control stream. */ | |
984 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
985 | DBG3("Creating relayd stream socket from URI"); | |
986 | ||
987 | /* Check relayd version */ | |
6151a90f | 988 | ret = relayd_version_check(rsock); |
67d5aa28 | 989 | if (ret == LTTNG_ERR_RELAYD_VERSION_FAIL) { |
9a654598 | 990 | status = LTTNG_ERR_RELAYD_VERSION_FAIL; |
67d5aa28 JD |
991 | goto close_sock; |
992 | } else if (ret < 0) { | |
993 | ERR("Unable to reach lttng-relayd"); | |
9a654598 | 994 | status = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
995 | goto close_sock; |
996 | } | |
b31610f2 JD |
997 | consumer->relay_major_version = rsock->major; |
998 | consumer->relay_minor_version = rsock->minor; | |
2f77fc4b DG |
999 | } else if (uri->stype == LTTNG_STREAM_DATA) { |
1000 | DBG3("Creating relayd data socket from URI"); | |
1001 | } else { | |
1002 | /* Command is not valid */ | |
1003 | ERR("Relayd invalid stream type: %d", uri->stype); | |
9a654598 | 1004 | status = LTTNG_ERR_INVALID; |
2f77fc4b DG |
1005 | goto close_sock; |
1006 | } | |
1007 | ||
6151a90f | 1008 | *relayd_sock = rsock; |
2f77fc4b | 1009 | |
9a654598 | 1010 | return status; |
2f77fc4b DG |
1011 | |
1012 | close_sock: | |
6151a90f JD |
1013 | /* The returned value is not useful since we are on an error path. */ |
1014 | (void) relayd_close(rsock); | |
2f77fc4b | 1015 | free_sock: |
6151a90f | 1016 | free(rsock); |
2f77fc4b | 1017 | error: |
9a654598 | 1018 | return status; |
2f77fc4b DG |
1019 | } |
1020 | ||
1021 | /* | |
1022 | * Connect to the relayd using URI and send the socket to the right consumer. | |
43fade62 JG |
1023 | * |
1024 | * The consumer socket lock must be held by the caller. | |
9a654598 JG |
1025 | * |
1026 | * Returns LTTNG_OK on success or an LTTng error code on failure. | |
2f77fc4b | 1027 | */ |
9a654598 JG |
1028 | static enum lttng_error_code send_consumer_relayd_socket( |
1029 | unsigned int session_id, | |
3044f922 | 1030 | struct lttng_uri *relayd_uri, |
56a37563 | 1031 | struct consumer_output *consumer, |
d3e2ba59 | 1032 | struct consumer_socket *consumer_sock, |
fb9a95c4 JG |
1033 | const char *session_name, const char *hostname, |
1034 | int session_live_timer) | |
2f77fc4b DG |
1035 | { |
1036 | int ret; | |
6151a90f | 1037 | struct lttcomm_relayd_sock *rsock = NULL; |
9a654598 | 1038 | enum lttng_error_code status; |
2f77fc4b | 1039 | |
ffe60014 | 1040 | /* Connect to relayd and make version check if uri is the control. */ |
9a654598 JG |
1041 | status = create_connect_relayd(relayd_uri, &rsock, consumer); |
1042 | if (status != LTTNG_OK) { | |
9e218353 | 1043 | goto relayd_comm_error; |
ffe60014 | 1044 | } |
6151a90f | 1045 | assert(rsock); |
ffe60014 | 1046 | |
2f77fc4b | 1047 | /* Set the network sequence index if not set. */ |
d88aee68 DG |
1048 | if (consumer->net_seq_index == (uint64_t) -1ULL) { |
1049 | pthread_mutex_lock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
1050 | /* |
1051 | * Increment net_seq_idx because we are about to transfer the | |
1052 | * new relayd socket to the consumer. | |
d88aee68 | 1053 | * Assign unique key so the consumer can match streams. |
2f77fc4b | 1054 | */ |
d88aee68 DG |
1055 | consumer->net_seq_index = ++relayd_net_seq_idx; |
1056 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
1057 | } |
1058 | ||
2f77fc4b | 1059 | /* Send relayd socket to consumer. */ |
6151a90f | 1060 | ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer, |
d3e2ba59 JD |
1061 | relayd_uri->stype, session_id, |
1062 | session_name, hostname, session_live_timer); | |
2f77fc4b | 1063 | if (ret < 0) { |
9a654598 | 1064 | status = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
1065 | goto close_sock; |
1066 | } | |
1067 | ||
c890b720 DG |
1068 | /* Flag that the corresponding socket was sent. */ |
1069 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
ffe60014 | 1070 | consumer_sock->control_sock_sent = 1; |
c890b720 | 1071 | } else if (relayd_uri->stype == LTTNG_STREAM_DATA) { |
ffe60014 | 1072 | consumer_sock->data_sock_sent = 1; |
c890b720 DG |
1073 | } |
1074 | ||
2f77fc4b DG |
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: | |
9a654598 | 1081 | if (status != LTTNG_OK) { |
ffe60014 | 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: | |
9a654598 | 1093 | return status; |
2f77fc4b DG |
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. | |
9a654598 JG |
1102 | * |
1103 | * Returns LTTNG_OK, or an LTTng error code on failure. | |
2f77fc4b | 1104 | */ |
9a654598 JG |
1105 | static enum lttng_error_code send_consumer_relayd_sockets( |
1106 | enum lttng_domain_type domain, | |
56a37563 | 1107 | unsigned int session_id, struct consumer_output *consumer, |
fb9a95c4 JG |
1108 | struct consumer_socket *sock, const char *session_name, |
1109 | const char *hostname, int session_live_timer) | |
2f77fc4b | 1110 | { |
9a654598 | 1111 | enum lttng_error_code status = LTTNG_OK; |
2f77fc4b | 1112 | |
2f77fc4b | 1113 | assert(consumer); |
6dc3064a | 1114 | assert(sock); |
2f77fc4b | 1115 | |
2f77fc4b | 1116 | /* Sending control relayd socket. */ |
ffe60014 | 1117 | if (!sock->control_sock_sent) { |
9a654598 | 1118 | status = send_consumer_relayd_socket(session_id, |
d3e2ba59 JD |
1119 | &consumer->dst.net.control, consumer, sock, |
1120 | session_name, hostname, session_live_timer); | |
9a654598 | 1121 | if (status != LTTNG_OK) { |
c890b720 DG |
1122 | goto error; |
1123 | } | |
2f77fc4b DG |
1124 | } |
1125 | ||
1126 | /* Sending data relayd socket. */ | |
ffe60014 | 1127 | if (!sock->data_sock_sent) { |
9a654598 | 1128 | status = send_consumer_relayd_socket(session_id, |
d3e2ba59 JD |
1129 | &consumer->dst.net.data, consumer, sock, |
1130 | session_name, hostname, session_live_timer); | |
9a654598 | 1131 | if (status != LTTNG_OK) { |
c890b720 DG |
1132 | goto error; |
1133 | } | |
2f77fc4b DG |
1134 | } |
1135 | ||
2f77fc4b | 1136 | error: |
9a654598 | 1137 | return status; |
2f77fc4b DG |
1138 | } |
1139 | ||
1140 | /* | |
1141 | * Setup relayd connections for a tracing session. First creates the socket to | |
1142 | * the relayd and send them to the right domain consumer. Consumer type MUST be | |
1143 | * network. | |
1144 | */ | |
ffe60014 | 1145 | int cmd_setup_relayd(struct ltt_session *session) |
2f77fc4b | 1146 | { |
f73fabfd | 1147 | int ret = LTTNG_OK; |
2f77fc4b DG |
1148 | struct ltt_ust_session *usess; |
1149 | struct ltt_kernel_session *ksess; | |
1150 | struct consumer_socket *socket; | |
1151 | struct lttng_ht_iter iter; | |
1152 | ||
1153 | assert(session); | |
1154 | ||
1155 | usess = session->ust_session; | |
1156 | ksess = session->kernel_session; | |
1157 | ||
785d2d0d | 1158 | DBG("Setting relayd for session %s", session->name); |
2f77fc4b | 1159 | |
e7fe706f DG |
1160 | rcu_read_lock(); |
1161 | ||
2f77fc4b DG |
1162 | if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET |
1163 | && usess->consumer->enabled) { | |
1164 | /* For each consumer socket, send relayd sockets */ | |
1165 | cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, | |
1166 | socket, node.node) { | |
2f77fc4b | 1167 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1168 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id, |
d3e2ba59 JD |
1169 | usess->consumer, socket, |
1170 | session->name, session->hostname, | |
1171 | session->live_timer); | |
2f77fc4b | 1172 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1173 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1174 | goto error; |
1175 | } | |
6dc3064a DG |
1176 | /* Session is now ready for network streaming. */ |
1177 | session->net_handle = 1; | |
2f77fc4b | 1178 | } |
b31610f2 JD |
1179 | session->consumer->relay_major_version = |
1180 | usess->consumer->relay_major_version; | |
1181 | session->consumer->relay_minor_version = | |
1182 | usess->consumer->relay_minor_version; | |
2f77fc4b DG |
1183 | } |
1184 | ||
1185 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET | |
1186 | && ksess->consumer->enabled) { | |
1187 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1188 | socket, node.node) { | |
2f77fc4b | 1189 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1190 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id, |
d3e2ba59 JD |
1191 | ksess->consumer, socket, |
1192 | session->name, session->hostname, | |
1193 | session->live_timer); | |
2f77fc4b | 1194 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1195 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1196 | goto error; |
1197 | } | |
6dc3064a DG |
1198 | /* Session is now ready for network streaming. */ |
1199 | session->net_handle = 1; | |
2f77fc4b | 1200 | } |
b31610f2 JD |
1201 | session->consumer->relay_major_version = |
1202 | ksess->consumer->relay_major_version; | |
1203 | session->consumer->relay_minor_version = | |
1204 | ksess->consumer->relay_minor_version; | |
2f77fc4b DG |
1205 | } |
1206 | ||
1207 | error: | |
e7fe706f | 1208 | rcu_read_unlock(); |
2f77fc4b DG |
1209 | return ret; |
1210 | } | |
1211 | ||
9b6c7ec5 DG |
1212 | /* |
1213 | * Start a kernel session by opening all necessary streams. | |
1214 | */ | |
1215 | static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe) | |
1216 | { | |
1217 | int ret; | |
1218 | struct ltt_kernel_channel *kchan; | |
1219 | ||
1220 | /* Open kernel metadata */ | |
07b86b52 | 1221 | if (ksess->metadata == NULL && ksess->output_traces) { |
9b6c7ec5 DG |
1222 | ret = kernel_open_metadata(ksess); |
1223 | if (ret < 0) { | |
1224 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1225 | goto error; | |
1226 | } | |
1227 | } | |
1228 | ||
1229 | /* Open kernel metadata stream */ | |
07b86b52 | 1230 | if (ksess->metadata && ksess->metadata_stream_fd < 0) { |
9b6c7ec5 DG |
1231 | ret = kernel_open_metadata_stream(ksess); |
1232 | if (ret < 0) { | |
1233 | ERR("Kernel create metadata stream failed"); | |
1234 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1235 | goto error; | |
1236 | } | |
1237 | } | |
1238 | ||
1239 | /* For each channel */ | |
1240 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
1241 | if (kchan->stream_count == 0) { | |
1242 | ret = kernel_open_channel_stream(kchan); | |
1243 | if (ret < 0) { | |
1244 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1245 | goto error; | |
1246 | } | |
1247 | /* Update the stream global counter */ | |
1248 | ksess->stream_count_global += ret; | |
1249 | } | |
1250 | } | |
1251 | ||
1252 | /* Setup kernel consumer socket and send fds to it */ | |
1253 | ret = init_kernel_tracing(ksess); | |
e43c41c5 | 1254 | if (ret != 0) { |
9b6c7ec5 DG |
1255 | ret = LTTNG_ERR_KERN_START_FAIL; |
1256 | goto error; | |
1257 | } | |
1258 | ||
1259 | /* This start the kernel tracing */ | |
1260 | ret = kernel_start_session(ksess); | |
1261 | if (ret < 0) { | |
1262 | ret = LTTNG_ERR_KERN_START_FAIL; | |
1263 | goto error; | |
1264 | } | |
1265 | ||
1266 | /* Quiescent wait after starting trace */ | |
462ae7ae | 1267 | kernel_wait_quiescent(wpipe); |
9b6c7ec5 | 1268 | |
14fb1ebe | 1269 | ksess->active = 1; |
9b6c7ec5 DG |
1270 | |
1271 | ret = LTTNG_OK; | |
1272 | ||
1273 | error: | |
1274 | return ret; | |
1275 | } | |
1276 | ||
2f77fc4b DG |
1277 | /* |
1278 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. | |
1279 | */ | |
56a37563 JG |
1280 | int cmd_disable_channel(struct ltt_session *session, |
1281 | enum lttng_domain_type domain, char *channel_name) | |
2f77fc4b DG |
1282 | { |
1283 | int ret; | |
1284 | struct ltt_ust_session *usess; | |
1285 | ||
1286 | usess = session->ust_session; | |
1287 | ||
2223c96f DG |
1288 | rcu_read_lock(); |
1289 | ||
2f77fc4b DG |
1290 | switch (domain) { |
1291 | case LTTNG_DOMAIN_KERNEL: | |
1292 | { | |
1293 | ret = channel_kernel_disable(session->kernel_session, | |
1294 | channel_name); | |
f73fabfd | 1295 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1296 | goto error; |
1297 | } | |
1298 | ||
1299 | kernel_wait_quiescent(kernel_tracer_fd); | |
1300 | break; | |
1301 | } | |
1302 | case LTTNG_DOMAIN_UST: | |
1303 | { | |
1304 | struct ltt_ust_channel *uchan; | |
1305 | struct lttng_ht *chan_ht; | |
1306 | ||
1307 | chan_ht = usess->domain_global.channels; | |
1308 | ||
1309 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
1310 | if (uchan == NULL) { | |
f73fabfd | 1311 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
1312 | goto error; |
1313 | } | |
1314 | ||
7972aab2 | 1315 | ret = channel_ust_disable(usess, uchan); |
f73fabfd | 1316 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1317 | goto error; |
1318 | } | |
1319 | break; | |
1320 | } | |
2f77fc4b | 1321 | default: |
f73fabfd | 1322 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1323 | goto error; |
1324 | } | |
1325 | ||
f73fabfd | 1326 | ret = LTTNG_OK; |
2f77fc4b DG |
1327 | |
1328 | error: | |
2223c96f | 1329 | rcu_read_unlock(); |
2f77fc4b DG |
1330 | return ret; |
1331 | } | |
1332 | ||
ccf10263 MD |
1333 | /* |
1334 | * Command LTTNG_TRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1335 | * |
1336 | * Called with session lock held. | |
ccf10263 | 1337 | */ |
56a37563 JG |
1338 | int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1339 | int pid) | |
ccf10263 MD |
1340 | { |
1341 | int ret; | |
1342 | ||
1343 | rcu_read_lock(); | |
1344 | ||
1345 | switch (domain) { | |
1346 | case LTTNG_DOMAIN_KERNEL: | |
1347 | { | |
1348 | struct ltt_kernel_session *ksess; | |
1349 | ||
1350 | ksess = session->kernel_session; | |
1351 | ||
1352 | ret = kernel_track_pid(ksess, pid); | |
1353 | if (ret != LTTNG_OK) { | |
1354 | goto error; | |
1355 | } | |
1356 | ||
1357 | kernel_wait_quiescent(kernel_tracer_fd); | |
1358 | break; | |
1359 | } | |
ccf10263 | 1360 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1361 | { |
1362 | struct ltt_ust_session *usess; | |
1363 | ||
1364 | usess = session->ust_session; | |
1365 | ||
1366 | ret = trace_ust_track_pid(usess, pid); | |
1367 | if (ret != LTTNG_OK) { | |
1368 | goto error; | |
1369 | } | |
1370 | break; | |
1371 | } | |
ccf10263 MD |
1372 | default: |
1373 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1374 | goto error; | |
1375 | } | |
1376 | ||
1377 | ret = LTTNG_OK; | |
1378 | ||
1379 | error: | |
1380 | rcu_read_unlock(); | |
1381 | return ret; | |
1382 | } | |
1383 | ||
1384 | /* | |
1385 | * Command LTTNG_UNTRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1386 | * |
1387 | * Called with session lock held. | |
ccf10263 | 1388 | */ |
56a37563 JG |
1389 | int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1390 | int pid) | |
ccf10263 MD |
1391 | { |
1392 | int ret; | |
1393 | ||
1394 | rcu_read_lock(); | |
1395 | ||
1396 | switch (domain) { | |
1397 | case LTTNG_DOMAIN_KERNEL: | |
1398 | { | |
1399 | struct ltt_kernel_session *ksess; | |
1400 | ||
1401 | ksess = session->kernel_session; | |
1402 | ||
1403 | ret = kernel_untrack_pid(ksess, pid); | |
1404 | if (ret != LTTNG_OK) { | |
1405 | goto error; | |
1406 | } | |
1407 | ||
1408 | kernel_wait_quiescent(kernel_tracer_fd); | |
1409 | break; | |
1410 | } | |
ccf10263 | 1411 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1412 | { |
1413 | struct ltt_ust_session *usess; | |
1414 | ||
1415 | usess = session->ust_session; | |
1416 | ||
1417 | ret = trace_ust_untrack_pid(usess, pid); | |
1418 | if (ret != LTTNG_OK) { | |
1419 | goto error; | |
1420 | } | |
1421 | break; | |
1422 | } | |
ccf10263 MD |
1423 | default: |
1424 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1425 | goto error; | |
1426 | } | |
1427 | ||
1428 | ret = LTTNG_OK; | |
1429 | ||
1430 | error: | |
1431 | rcu_read_unlock(); | |
1432 | return ret; | |
1433 | } | |
1434 | ||
2f77fc4b DG |
1435 | /* |
1436 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
1437 | * | |
1438 | * The wpipe arguments is used as a notifier for the kernel thread. | |
1439 | */ | |
1440 | int cmd_enable_channel(struct ltt_session *session, | |
7972aab2 | 1441 | struct lttng_domain *domain, struct lttng_channel *attr, int wpipe) |
2f77fc4b DG |
1442 | { |
1443 | int ret; | |
1444 | struct ltt_ust_session *usess = session->ust_session; | |
1445 | struct lttng_ht *chan_ht; | |
1f345e94 | 1446 | size_t len; |
2f77fc4b DG |
1447 | |
1448 | assert(session); | |
1449 | assert(attr); | |
7972aab2 | 1450 | assert(domain); |
2f77fc4b | 1451 | |
f5436bfc | 1452 | len = lttng_strnlen(attr->name, sizeof(attr->name)); |
1f345e94 PP |
1453 | |
1454 | /* Validate channel name */ | |
1455 | if (attr->name[0] == '.' || | |
1456 | memchr(attr->name, '/', len) != NULL) { | |
1457 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1458 | goto end; | |
1459 | } | |
1460 | ||
2f77fc4b DG |
1461 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
1462 | ||
03b4fdcf DG |
1463 | rcu_read_lock(); |
1464 | ||
ecc48a90 JD |
1465 | /* |
1466 | * Don't try to enable a channel if the session has been started at | |
1467 | * some point in time before. The tracer does not allow it. | |
1468 | */ | |
8382cf6f | 1469 | if (session->has_been_started) { |
ecc48a90 JD |
1470 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
1471 | goto error; | |
1472 | } | |
1473 | ||
1474 | /* | |
1475 | * If the session is a live session, remove the switch timer, the | |
1476 | * live timer does the same thing but sends also synchronisation | |
1477 | * beacons for inactive streams. | |
1478 | */ | |
1479 | if (session->live_timer > 0) { | |
1480 | attr->attr.live_timer_interval = session->live_timer; | |
1481 | attr->attr.switch_timer_interval = 0; | |
1482 | } | |
1483 | ||
6e21424e JR |
1484 | /* Check for feature support */ |
1485 | switch (domain->type) { | |
1486 | case LTTNG_DOMAIN_KERNEL: | |
1487 | { | |
1488 | if (kernel_supports_ring_buffer_snapshot_sample_positions(kernel_tracer_fd) != 1) { | |
1489 | /* Sampling position of buffer is not supported */ | |
1490 | WARN("Kernel tracer does not support buffer monitoring. " | |
1491 | "Setting the monitor interval timer to 0 " | |
1492 | "(disabled) for channel '%s' of session '%s'", | |
1493 | attr-> name, session->name); | |
1494 | lttng_channel_set_monitor_timer_interval(attr, 0); | |
1495 | } | |
1496 | break; | |
1497 | } | |
1498 | case LTTNG_DOMAIN_UST: | |
f28f9e44 | 1499 | break; |
6e21424e JR |
1500 | case LTTNG_DOMAIN_JUL: |
1501 | case LTTNG_DOMAIN_LOG4J: | |
1502 | case LTTNG_DOMAIN_PYTHON: | |
f28f9e44 JG |
1503 | if (!agent_tracing_is_enabled()) { |
1504 | DBG("Attempted to enable a channel in an agent domain but the agent thread is not running"); | |
1505 | ret = LTTNG_ERR_AGENT_TRACING_DISABLED; | |
1506 | goto error; | |
1507 | } | |
6e21424e JR |
1508 | break; |
1509 | default: | |
1510 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1511 | goto error; | |
1512 | } | |
1513 | ||
7972aab2 | 1514 | switch (domain->type) { |
2f77fc4b DG |
1515 | case LTTNG_DOMAIN_KERNEL: |
1516 | { | |
1517 | struct ltt_kernel_channel *kchan; | |
1518 | ||
2f77fc4b DG |
1519 | kchan = trace_kernel_get_channel_by_name(attr->name, |
1520 | session->kernel_session); | |
1521 | if (kchan == NULL) { | |
54213acc JG |
1522 | if (session->snapshot.nb_output > 0 || |
1523 | session->snapshot_mode) { | |
1524 | /* Enforce mmap output for snapshot sessions. */ | |
1525 | attr->attr.output = LTTNG_EVENT_MMAP; | |
1526 | } | |
2f77fc4b | 1527 | ret = channel_kernel_create(session->kernel_session, attr, wpipe); |
85076754 MD |
1528 | if (attr->name[0] != '\0') { |
1529 | session->kernel_session->has_non_default_channel = 1; | |
1530 | } | |
2f77fc4b DG |
1531 | } else { |
1532 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
1533 | } | |
1534 | ||
f73fabfd | 1535 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1536 | goto error; |
1537 | } | |
1538 | ||
784303b0 | 1539 | kernel_wait_quiescent(kernel_tracer_fd); |
2f77fc4b DG |
1540 | break; |
1541 | } | |
1542 | case LTTNG_DOMAIN_UST: | |
9232818f JG |
1543 | case LTTNG_DOMAIN_JUL: |
1544 | case LTTNG_DOMAIN_LOG4J: | |
1545 | case LTTNG_DOMAIN_PYTHON: | |
2f77fc4b DG |
1546 | { |
1547 | struct ltt_ust_channel *uchan; | |
1548 | ||
9232818f JG |
1549 | /* |
1550 | * FIXME | |
1551 | * | |
1552 | * Current agent implementation limitations force us to allow | |
1553 | * only one channel at once in "agent" subdomains. Each | |
1554 | * subdomain has a default channel name which must be strictly | |
1555 | * adhered to. | |
1556 | */ | |
1557 | if (domain->type == LTTNG_DOMAIN_JUL) { | |
1558 | if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME, | |
1559 | LTTNG_SYMBOL_NAME_LEN)) { | |
1560 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1561 | goto error; | |
1562 | } | |
1563 | } else if (domain->type == LTTNG_DOMAIN_LOG4J) { | |
1564 | if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME, | |
1565 | LTTNG_SYMBOL_NAME_LEN)) { | |
1566 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1567 | goto error; | |
1568 | } | |
1569 | } else if (domain->type == LTTNG_DOMAIN_PYTHON) { | |
1570 | if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME, | |
1571 | LTTNG_SYMBOL_NAME_LEN)) { | |
1572 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1573 | goto error; | |
1574 | } | |
1575 | } | |
1576 | ||
2f77fc4b DG |
1577 | chan_ht = usess->domain_global.channels; |
1578 | ||
1579 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); | |
1580 | if (uchan == NULL) { | |
7972aab2 | 1581 | ret = channel_ust_create(usess, attr, domain->buf_type); |
85076754 MD |
1582 | if (attr->name[0] != '\0') { |
1583 | usess->has_non_default_channel = 1; | |
1584 | } | |
2f77fc4b | 1585 | } else { |
7972aab2 | 1586 | ret = channel_ust_enable(usess, uchan); |
2f77fc4b DG |
1587 | } |
1588 | break; | |
1589 | } | |
2f77fc4b | 1590 | default: |
f73fabfd | 1591 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1592 | goto error; |
1593 | } | |
1594 | ||
54213acc JG |
1595 | if (ret == LTTNG_OK && attr->attr.output != LTTNG_EVENT_MMAP) { |
1596 | session->has_non_mmap_channel = true; | |
1597 | } | |
2f77fc4b | 1598 | error: |
2223c96f | 1599 | rcu_read_unlock(); |
1f345e94 | 1600 | end: |
2f77fc4b DG |
1601 | return ret; |
1602 | } | |
1603 | ||
2f77fc4b DG |
1604 | /* |
1605 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1606 | */ | |
56a37563 JG |
1607 | int cmd_disable_event(struct ltt_session *session, |
1608 | enum lttng_domain_type domain, char *channel_name, | |
6e911cad | 1609 | struct lttng_event *event) |
2f77fc4b DG |
1610 | { |
1611 | int ret; | |
6e911cad MD |
1612 | char *event_name; |
1613 | ||
18a720cd MD |
1614 | DBG("Disable event command for event \'%s\'", event->name); |
1615 | ||
6e911cad MD |
1616 | event_name = event->name; |
1617 | ||
9b7431cf JG |
1618 | /* Error out on unhandled search criteria */ |
1619 | if (event->loglevel_type || event->loglevel != -1 || event->enabled | |
6e911cad | 1620 | || event->pid || event->filter || event->exclusion) { |
7076b56e JG |
1621 | ret = LTTNG_ERR_UNK; |
1622 | goto error; | |
6e911cad | 1623 | } |
2f77fc4b | 1624 | |
2223c96f DG |
1625 | rcu_read_lock(); |
1626 | ||
2f77fc4b DG |
1627 | switch (domain) { |
1628 | case LTTNG_DOMAIN_KERNEL: | |
1629 | { | |
1630 | struct ltt_kernel_channel *kchan; | |
1631 | struct ltt_kernel_session *ksess; | |
1632 | ||
1633 | ksess = session->kernel_session; | |
1634 | ||
85076754 MD |
1635 | /* |
1636 | * If a non-default channel has been created in the | |
1637 | * session, explicitely require that -c chan_name needs | |
1638 | * to be provided. | |
1639 | */ | |
1640 | if (ksess->has_non_default_channel && channel_name[0] == '\0') { | |
1641 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1642 | goto error_unlock; |
85076754 MD |
1643 | } |
1644 | ||
2f77fc4b DG |
1645 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
1646 | if (kchan == NULL) { | |
f73fabfd | 1647 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
7076b56e | 1648 | goto error_unlock; |
2f77fc4b DG |
1649 | } |
1650 | ||
6e911cad MD |
1651 | switch (event->type) { |
1652 | case LTTNG_EVENT_ALL: | |
9550ee81 | 1653 | case LTTNG_EVENT_TRACEPOINT: |
d0ae4ea8 | 1654 | case LTTNG_EVENT_SYSCALL: |
9550ee81 JR |
1655 | case LTTNG_EVENT_PROBE: |
1656 | case LTTNG_EVENT_FUNCTION: | |
1657 | case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */ | |
1658 | if (event_name[0] == '\0') { | |
1659 | ret = event_kernel_disable_event(kchan, | |
1660 | NULL, event->type); | |
29c62722 | 1661 | } else { |
d0ae4ea8 | 1662 | ret = event_kernel_disable_event(kchan, |
9550ee81 | 1663 | event_name, event->type); |
29c62722 | 1664 | } |
6e911cad | 1665 | if (ret != LTTNG_OK) { |
7076b56e | 1666 | goto error_unlock; |
6e911cad MD |
1667 | } |
1668 | break; | |
6e911cad MD |
1669 | default: |
1670 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1671 | goto error_unlock; |
2f77fc4b DG |
1672 | } |
1673 | ||
1674 | kernel_wait_quiescent(kernel_tracer_fd); | |
1675 | break; | |
1676 | } | |
1677 | case LTTNG_DOMAIN_UST: | |
1678 | { | |
1679 | struct ltt_ust_channel *uchan; | |
1680 | struct ltt_ust_session *usess; | |
1681 | ||
1682 | usess = session->ust_session; | |
1683 | ||
7076b56e JG |
1684 | if (validate_ust_event_name(event_name)) { |
1685 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1686 | goto error_unlock; | |
1687 | } | |
1688 | ||
85076754 MD |
1689 | /* |
1690 | * If a non-default channel has been created in the | |
9550ee81 | 1691 | * session, explicitly require that -c chan_name needs |
85076754 MD |
1692 | * to be provided. |
1693 | */ | |
1694 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1695 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1696 | goto error_unlock; |
85076754 MD |
1697 | } |
1698 | ||
2f77fc4b DG |
1699 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
1700 | channel_name); | |
1701 | if (uchan == NULL) { | |
f73fabfd | 1702 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
7076b56e | 1703 | goto error_unlock; |
2f77fc4b DG |
1704 | } |
1705 | ||
6e911cad MD |
1706 | switch (event->type) { |
1707 | case LTTNG_EVENT_ALL: | |
b3639870 JR |
1708 | /* |
1709 | * An empty event name means that everything | |
1710 | * should be disabled. | |
1711 | */ | |
1712 | if (event->name[0] == '\0') { | |
1713 | ret = event_ust_disable_all_tracepoints(usess, uchan); | |
77d536b2 JR |
1714 | } else { |
1715 | ret = event_ust_disable_tracepoint(usess, uchan, | |
1716 | event_name); | |
1717 | } | |
6e911cad | 1718 | if (ret != LTTNG_OK) { |
7076b56e | 1719 | goto error_unlock; |
6e911cad MD |
1720 | } |
1721 | break; | |
1722 | default: | |
1723 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1724 | goto error_unlock; |
2f77fc4b DG |
1725 | } |
1726 | ||
1727 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
1728 | channel_name); | |
1729 | break; | |
1730 | } | |
5cdb6027 | 1731 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1732 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1733 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1734 | { |
fefd409b | 1735 | struct agent *agt; |
f20baf8e DG |
1736 | struct ltt_ust_session *usess = session->ust_session; |
1737 | ||
1738 | assert(usess); | |
1739 | ||
6e911cad MD |
1740 | switch (event->type) { |
1741 | case LTTNG_EVENT_ALL: | |
1742 | break; | |
1743 | default: | |
1744 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1745 | goto error_unlock; |
6e911cad MD |
1746 | } |
1747 | ||
5cdb6027 | 1748 | agt = trace_ust_find_agent(usess, domain); |
fefd409b DG |
1749 | if (!agt) { |
1750 | ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
7076b56e | 1751 | goto error_unlock; |
fefd409b | 1752 | } |
b3639870 JR |
1753 | /* |
1754 | * An empty event name means that everything | |
1755 | * should be disabled. | |
1756 | */ | |
1757 | if (event->name[0] == '\0') { | |
18a720cd MD |
1758 | ret = event_agent_disable_all(usess, agt); |
1759 | } else { | |
1760 | ret = event_agent_disable(usess, agt, event_name); | |
1761 | } | |
f20baf8e | 1762 | if (ret != LTTNG_OK) { |
7076b56e | 1763 | goto error_unlock; |
f20baf8e DG |
1764 | } |
1765 | ||
1766 | break; | |
1767 | } | |
2f77fc4b | 1768 | default: |
f73fabfd | 1769 | ret = LTTNG_ERR_UND; |
7076b56e | 1770 | goto error_unlock; |
2f77fc4b DG |
1771 | } |
1772 | ||
f73fabfd | 1773 | ret = LTTNG_OK; |
2f77fc4b | 1774 | |
7076b56e | 1775 | error_unlock: |
2223c96f | 1776 | rcu_read_unlock(); |
7076b56e | 1777 | error: |
2f77fc4b DG |
1778 | return ret; |
1779 | } | |
1780 | ||
2f77fc4b DG |
1781 | /* |
1782 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1783 | */ | |
56a37563 | 1784 | int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain, |
601d5acf | 1785 | char *channel_name, struct lttng_event_context *ctx, int kwpipe) |
2f77fc4b | 1786 | { |
d5979e4a | 1787 | int ret, chan_kern_created = 0, chan_ust_created = 0; |
bdf64013 JG |
1788 | char *app_ctx_provider_name = NULL, *app_ctx_name = NULL; |
1789 | ||
9a699f7b JR |
1790 | /* |
1791 | * Don't try to add a context if the session has been started at | |
1792 | * some point in time before. The tracer does not allow it and would | |
1793 | * result in a corrupted trace. | |
1794 | */ | |
1795 | if (session->has_been_started) { | |
1796 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; | |
1797 | goto end; | |
1798 | } | |
1799 | ||
bdf64013 JG |
1800 | if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) { |
1801 | app_ctx_provider_name = ctx->u.app_ctx.provider_name; | |
1802 | app_ctx_name = ctx->u.app_ctx.ctx_name; | |
1803 | } | |
2f77fc4b DG |
1804 | |
1805 | switch (domain) { | |
1806 | case LTTNG_DOMAIN_KERNEL: | |
979e618e DG |
1807 | assert(session->kernel_session); |
1808 | ||
1809 | if (session->kernel_session->channel_count == 0) { | |
1810 | /* Create default channel */ | |
1811 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); | |
1812 | if (ret != LTTNG_OK) { | |
1813 | goto error; | |
1814 | } | |
d5979e4a | 1815 | chan_kern_created = 1; |
979e618e | 1816 | } |
2f77fc4b | 1817 | /* Add kernel context to kernel tracer */ |
601d5acf | 1818 | ret = context_kernel_add(session->kernel_session, ctx, channel_name); |
f73fabfd | 1819 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1820 | goto error; |
1821 | } | |
1822 | break; | |
bdf64013 JG |
1823 | case LTTNG_DOMAIN_JUL: |
1824 | case LTTNG_DOMAIN_LOG4J: | |
1825 | { | |
1826 | /* | |
1827 | * Validate channel name. | |
1828 | * If no channel name is given and the domain is JUL or LOG4J, | |
1829 | * set it to the appropriate domain-specific channel name. If | |
1830 | * a name is provided but does not match the expexted channel | |
1831 | * name, return an error. | |
1832 | */ | |
1833 | if (domain == LTTNG_DOMAIN_JUL && *channel_name && | |
1834 | strcmp(channel_name, | |
1835 | DEFAULT_JUL_CHANNEL_NAME)) { | |
1836 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1837 | goto error; | |
1838 | } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name && | |
1839 | strcmp(channel_name, | |
1840 | DEFAULT_LOG4J_CHANNEL_NAME)) { | |
1841 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1842 | goto error; | |
1843 | } | |
a93b3916 | 1844 | /* break is _not_ missing here. */ |
bdf64013 | 1845 | } |
2f77fc4b DG |
1846 | case LTTNG_DOMAIN_UST: |
1847 | { | |
1848 | struct ltt_ust_session *usess = session->ust_session; | |
85076754 MD |
1849 | unsigned int chan_count; |
1850 | ||
2f77fc4b DG |
1851 | assert(usess); |
1852 | ||
85076754 | 1853 | chan_count = lttng_ht_get_count(usess->domain_global.channels); |
979e618e DG |
1854 | if (chan_count == 0) { |
1855 | struct lttng_channel *attr; | |
1856 | /* Create default channel */ | |
0a9c6494 | 1857 | attr = channel_new_default_attr(domain, usess->buffer_type); |
979e618e DG |
1858 | if (attr == NULL) { |
1859 | ret = LTTNG_ERR_FATAL; | |
1860 | goto error; | |
1861 | } | |
1862 | ||
7972aab2 | 1863 | ret = channel_ust_create(usess, attr, usess->buffer_type); |
979e618e DG |
1864 | if (ret != LTTNG_OK) { |
1865 | free(attr); | |
1866 | goto error; | |
1867 | } | |
cf0bcb51 | 1868 | channel_attr_destroy(attr); |
d5979e4a | 1869 | chan_ust_created = 1; |
979e618e DG |
1870 | } |
1871 | ||
601d5acf | 1872 | ret = context_ust_add(usess, domain, ctx, channel_name); |
bdf64013 JG |
1873 | free(app_ctx_provider_name); |
1874 | free(app_ctx_name); | |
1875 | app_ctx_name = NULL; | |
1876 | app_ctx_provider_name = NULL; | |
f73fabfd | 1877 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1878 | goto error; |
1879 | } | |
1880 | break; | |
1881 | } | |
2f77fc4b | 1882 | default: |
f73fabfd | 1883 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1884 | goto error; |
1885 | } | |
1886 | ||
bdf64013 JG |
1887 | ret = LTTNG_OK; |
1888 | goto end; | |
2f77fc4b DG |
1889 | |
1890 | error: | |
d5979e4a DG |
1891 | if (chan_kern_created) { |
1892 | struct ltt_kernel_channel *kchan = | |
1893 | trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME, | |
1894 | session->kernel_session); | |
1895 | /* Created previously, this should NOT fail. */ | |
1896 | assert(kchan); | |
1897 | kernel_destroy_channel(kchan); | |
1898 | } | |
1899 | ||
1900 | if (chan_ust_created) { | |
1901 | struct ltt_ust_channel *uchan = | |
1902 | trace_ust_find_channel_by_name( | |
1903 | session->ust_session->domain_global.channels, | |
1904 | DEFAULT_CHANNEL_NAME); | |
1905 | /* Created previously, this should NOT fail. */ | |
1906 | assert(uchan); | |
1907 | /* Remove from the channel list of the session. */ | |
1908 | trace_ust_delete_channel(session->ust_session->domain_global.channels, | |
1909 | uchan); | |
1910 | trace_ust_destroy_channel(uchan); | |
1911 | } | |
bdf64013 JG |
1912 | end: |
1913 | free(app_ctx_provider_name); | |
1914 | free(app_ctx_name); | |
2f77fc4b DG |
1915 | return ret; |
1916 | } | |
1917 | ||
dac8e046 JG |
1918 | static inline bool name_starts_with(const char *name, const char *prefix) |
1919 | { | |
1920 | const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN); | |
1921 | ||
1922 | return !strncmp(name, prefix, max_cmp_len); | |
1923 | } | |
1924 | ||
1925 | /* Perform userspace-specific event name validation */ | |
1926 | static int validate_ust_event_name(const char *name) | |
1927 | { | |
1928 | int ret = 0; | |
1929 | ||
1930 | if (!name) { | |
1931 | ret = -1; | |
1932 | goto end; | |
1933 | } | |
1934 | ||
1935 | /* | |
1936 | * Check name against all internal UST event component namespaces used | |
1937 | * by the agents. | |
1938 | */ | |
1939 | if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) || | |
1940 | name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) || | |
1941 | name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) { | |
1942 | ret = -1; | |
1943 | } | |
1944 | ||
1945 | end: | |
1946 | return ret; | |
1947 | } | |
88f06f15 | 1948 | |
2f77fc4b | 1949 | /* |
88f06f15 JG |
1950 | * Internal version of cmd_enable_event() with a supplemental |
1951 | * "internal_event" flag which is used to enable internal events which should | |
1952 | * be hidden from clients. Such events are used in the agent implementation to | |
1953 | * enable the events through which all "agent" events are funeled. | |
2f77fc4b | 1954 | */ |
88f06f15 JG |
1955 | static int _cmd_enable_event(struct ltt_session *session, |
1956 | struct lttng_domain *domain, | |
025faf73 | 1957 | char *channel_name, struct lttng_event *event, |
6b453b5e | 1958 | char *filter_expression, |
db8f1377 JI |
1959 | struct lttng_filter_bytecode *filter, |
1960 | struct lttng_event_exclusion *exclusion, | |
88f06f15 | 1961 | int wpipe, bool internal_event) |
2f77fc4b | 1962 | { |
9f449915 | 1963 | int ret = 0, channel_created = 0; |
cfedea03 | 1964 | struct lttng_channel *attr = NULL; |
2f77fc4b DG |
1965 | |
1966 | assert(session); | |
1967 | assert(event); | |
1968 | assert(channel_name); | |
1969 | ||
2a385866 JG |
1970 | /* If we have a filter, we must have its filter expression */ |
1971 | assert(!(!!filter_expression ^ !!filter)); | |
1972 | ||
9f449915 PP |
1973 | /* Normalize event name as a globbing pattern */ |
1974 | strutils_normalize_star_glob_pattern(event->name); | |
18a720cd | 1975 | |
9f449915 PP |
1976 | /* Normalize exclusion names as globbing patterns */ |
1977 | if (exclusion) { | |
1978 | size_t i; | |
f5ac4bd7 | 1979 | |
9f449915 PP |
1980 | for (i = 0; i < exclusion->count; i++) { |
1981 | char *name = LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i); | |
1982 | ||
1983 | strutils_normalize_star_glob_pattern(name); | |
1984 | } | |
930a2e99 JG |
1985 | } |
1986 | ||
9f449915 PP |
1987 | DBG("Enable event command for event \'%s\'", event->name); |
1988 | ||
1989 | rcu_read_lock(); | |
1990 | ||
7972aab2 | 1991 | switch (domain->type) { |
2f77fc4b DG |
1992 | case LTTNG_DOMAIN_KERNEL: |
1993 | { | |
1994 | struct ltt_kernel_channel *kchan; | |
1995 | ||
85076754 MD |
1996 | /* |
1997 | * If a non-default channel has been created in the | |
1998 | * session, explicitely require that -c chan_name needs | |
1999 | * to be provided. | |
2000 | */ | |
2001 | if (session->kernel_session->has_non_default_channel | |
2002 | && channel_name[0] == '\0') { | |
2003 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
2004 | goto error; | |
2005 | } | |
2006 | ||
2f77fc4b DG |
2007 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2008 | session->kernel_session); | |
2009 | if (kchan == NULL) { | |
0a9c6494 DG |
2010 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
2011 | LTTNG_BUFFER_GLOBAL); | |
2f77fc4b | 2012 | if (attr == NULL) { |
f73fabfd | 2013 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2014 | goto error; |
2015 | } | |
04c17253 MD |
2016 | if (lttng_strncpy(attr->name, channel_name, |
2017 | sizeof(attr->name))) { | |
2018 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
2019 | goto error; |
2020 | } | |
2f77fc4b DG |
2021 | |
2022 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 2023 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2024 | goto error; |
2025 | } | |
e5f5db7f | 2026 | channel_created = 1; |
2f77fc4b DG |
2027 | } |
2028 | ||
2029 | /* Get the newly created kernel channel pointer */ | |
2030 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2031 | session->kernel_session); | |
2032 | if (kchan == NULL) { | |
2033 | /* This sould not happen... */ | |
f73fabfd | 2034 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2035 | goto error; |
2036 | } | |
2037 | ||
6e911cad MD |
2038 | switch (event->type) { |
2039 | case LTTNG_EVENT_ALL: | |
29c62722 | 2040 | { |
00a62084 MD |
2041 | char *filter_expression_a = NULL; |
2042 | struct lttng_filter_bytecode *filter_a = NULL; | |
2043 | ||
2044 | /* | |
2045 | * We need to duplicate filter_expression and filter, | |
2046 | * because ownership is passed to first enable | |
2047 | * event. | |
2048 | */ | |
2049 | if (filter_expression) { | |
2050 | filter_expression_a = strdup(filter_expression); | |
2051 | if (!filter_expression_a) { | |
2052 | ret = LTTNG_ERR_FATAL; | |
2053 | goto error; | |
2054 | } | |
2055 | } | |
2056 | if (filter) { | |
2057 | filter_a = zmalloc(sizeof(*filter_a) + filter->len); | |
2058 | if (!filter_a) { | |
2059 | free(filter_expression_a); | |
2060 | ret = LTTNG_ERR_FATAL; | |
2061 | goto error; | |
2062 | } | |
2063 | memcpy(filter_a, filter, sizeof(*filter_a) + filter->len); | |
2064 | } | |
29c62722 | 2065 | event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */ |
00a62084 MD |
2066 | ret = event_kernel_enable_event(kchan, event, |
2067 | filter_expression, filter); | |
a969e101 MD |
2068 | /* We have passed ownership */ |
2069 | filter_expression = NULL; | |
2070 | filter = NULL; | |
29c62722 MD |
2071 | if (ret != LTTNG_OK) { |
2072 | if (channel_created) { | |
2073 | /* Let's not leak a useless channel. */ | |
2074 | kernel_destroy_channel(kchan); | |
2075 | } | |
00a62084 MD |
2076 | free(filter_expression_a); |
2077 | free(filter_a); | |
29c62722 MD |
2078 | goto error; |
2079 | } | |
2080 | event->type = LTTNG_EVENT_SYSCALL; /* Hack */ | |
00a62084 MD |
2081 | ret = event_kernel_enable_event(kchan, event, |
2082 | filter_expression_a, filter_a); | |
60d21fa2 AB |
2083 | /* We have passed ownership */ |
2084 | filter_expression_a = NULL; | |
2085 | filter_a = NULL; | |
29c62722 MD |
2086 | if (ret != LTTNG_OK) { |
2087 | goto error; | |
2088 | } | |
2089 | break; | |
2090 | } | |
6e6ef3d7 | 2091 | case LTTNG_EVENT_PROBE: |
dcabc190 | 2092 | case LTTNG_EVENT_USERSPACE_PROBE: |
6e6ef3d7 DG |
2093 | case LTTNG_EVENT_FUNCTION: |
2094 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
6e911cad | 2095 | case LTTNG_EVENT_TRACEPOINT: |
00a62084 MD |
2096 | ret = event_kernel_enable_event(kchan, event, |
2097 | filter_expression, filter); | |
a969e101 MD |
2098 | /* We have passed ownership */ |
2099 | filter_expression = NULL; | |
2100 | filter = NULL; | |
6e911cad MD |
2101 | if (ret != LTTNG_OK) { |
2102 | if (channel_created) { | |
2103 | /* Let's not leak a useless channel. */ | |
2104 | kernel_destroy_channel(kchan); | |
2105 | } | |
2106 | goto error; | |
e5f5db7f | 2107 | } |
6e911cad MD |
2108 | break; |
2109 | case LTTNG_EVENT_SYSCALL: | |
00a62084 MD |
2110 | ret = event_kernel_enable_event(kchan, event, |
2111 | filter_expression, filter); | |
a969e101 MD |
2112 | /* We have passed ownership */ |
2113 | filter_expression = NULL; | |
2114 | filter = NULL; | |
e2b957af MD |
2115 | if (ret != LTTNG_OK) { |
2116 | goto error; | |
2117 | } | |
6e911cad MD |
2118 | break; |
2119 | default: | |
2120 | ret = LTTNG_ERR_UNK; | |
2f77fc4b DG |
2121 | goto error; |
2122 | } | |
2123 | ||
2124 | kernel_wait_quiescent(kernel_tracer_fd); | |
2125 | break; | |
2126 | } | |
2127 | case LTTNG_DOMAIN_UST: | |
2128 | { | |
2129 | struct ltt_ust_channel *uchan; | |
2130 | struct ltt_ust_session *usess = session->ust_session; | |
2131 | ||
2132 | assert(usess); | |
2133 | ||
85076754 MD |
2134 | /* |
2135 | * If a non-default channel has been created in the | |
2136 | * session, explicitely require that -c chan_name needs | |
2137 | * to be provided. | |
2138 | */ | |
2139 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
2140 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
2141 | goto error; | |
2142 | } | |
2143 | ||
2f77fc4b DG |
2144 | /* Get channel from global UST domain */ |
2145 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2146 | channel_name); | |
2147 | if (uchan == NULL) { | |
2148 | /* Create default channel */ | |
0a9c6494 DG |
2149 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
2150 | usess->buffer_type); | |
2f77fc4b | 2151 | if (attr == NULL) { |
f73fabfd | 2152 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2153 | goto error; |
2154 | } | |
04c17253 MD |
2155 | if (lttng_strncpy(attr->name, channel_name, |
2156 | sizeof(attr->name))) { | |
2157 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
2158 | goto error; |
2159 | } | |
2f77fc4b DG |
2160 | |
2161 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 2162 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2163 | goto error; |
2164 | } | |
2f77fc4b DG |
2165 | |
2166 | /* Get the newly created channel reference back */ | |
2167 | uchan = trace_ust_find_channel_by_name( | |
2168 | usess->domain_global.channels, channel_name); | |
2169 | assert(uchan); | |
2170 | } | |
2171 | ||
141feb8c JG |
2172 | if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) { |
2173 | /* | |
2174 | * Don't allow users to add UST events to channels which | |
2175 | * are assigned to a userspace subdomain (JUL, Log4J, | |
2176 | * Python, etc.). | |
2177 | */ | |
2178 | ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN; | |
2179 | goto error; | |
2180 | } | |
2181 | ||
dac8e046 JG |
2182 | if (!internal_event) { |
2183 | /* | |
2184 | * Ensure the event name is not reserved for internal | |
2185 | * use. | |
2186 | */ | |
2187 | ret = validate_ust_event_name(event->name); | |
2188 | if (ret) { | |
2189 | WARN("Userspace event name %s failed validation.", | |
bbcab087 | 2190 | event->name); |
dac8e046 JG |
2191 | ret = LTTNG_ERR_INVALID_EVENT_NAME; |
2192 | goto error; | |
2193 | } | |
2194 | } | |
2195 | ||
2f77fc4b | 2196 | /* At this point, the session and channel exist on the tracer */ |
6b453b5e | 2197 | ret = event_ust_enable_tracepoint(usess, uchan, event, |
88f06f15 JG |
2198 | filter_expression, filter, exclusion, |
2199 | internal_event); | |
49d21f93 MD |
2200 | /* We have passed ownership */ |
2201 | filter_expression = NULL; | |
2202 | filter = NULL; | |
2203 | exclusion = NULL; | |
94382e15 JG |
2204 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2205 | goto already_enabled; | |
2206 | } else if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2207 | goto error; |
2208 | } | |
2209 | break; | |
2210 | } | |
5cdb6027 | 2211 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 2212 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2213 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 2214 | { |
da6c3a50 | 2215 | const char *default_event_name, *default_chan_name; |
fefd409b | 2216 | struct agent *agt; |
f20baf8e DG |
2217 | struct lttng_event uevent; |
2218 | struct lttng_domain tmp_dom; | |
2219 | struct ltt_ust_session *usess = session->ust_session; | |
2220 | ||
2221 | assert(usess); | |
2222 | ||
f28f9e44 JG |
2223 | if (!agent_tracing_is_enabled()) { |
2224 | DBG("Attempted to enable an event in an agent domain but the agent thread is not running"); | |
2225 | ret = LTTNG_ERR_AGENT_TRACING_DISABLED; | |
2226 | goto error; | |
2227 | } | |
2228 | ||
5cdb6027 | 2229 | agt = trace_ust_find_agent(usess, domain->type); |
fefd409b | 2230 | if (!agt) { |
5cdb6027 | 2231 | agt = agent_create(domain->type); |
fefd409b | 2232 | if (!agt) { |
e5b3c48c | 2233 | ret = LTTNG_ERR_NOMEM; |
fefd409b DG |
2234 | goto error; |
2235 | } | |
2236 | agent_add(agt, usess->agents); | |
2237 | } | |
2238 | ||
022d91ba | 2239 | /* Create the default tracepoint. */ |
996de3c7 | 2240 | memset(&uevent, 0, sizeof(uevent)); |
f20baf8e DG |
2241 | uevent.type = LTTNG_EVENT_TRACEPOINT; |
2242 | uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
51755dc8 JG |
2243 | default_event_name = event_get_default_agent_ust_name( |
2244 | domain->type); | |
da6c3a50 | 2245 | if (!default_event_name) { |
e5b3c48c | 2246 | ret = LTTNG_ERR_FATAL; |
da6c3a50 | 2247 | goto error; |
f43f95a9 | 2248 | } |
da6c3a50 | 2249 | strncpy(uevent.name, default_event_name, sizeof(uevent.name)); |
f20baf8e DG |
2250 | uevent.name[sizeof(uevent.name) - 1] = '\0'; |
2251 | ||
2252 | /* | |
2253 | * The domain type is changed because we are about to enable the | |
2254 | * default channel and event for the JUL domain that are hardcoded. | |
2255 | * This happens in the UST domain. | |
2256 | */ | |
2257 | memcpy(&tmp_dom, domain, sizeof(tmp_dom)); | |
2258 | tmp_dom.type = LTTNG_DOMAIN_UST; | |
2259 | ||
0e115563 DG |
2260 | switch (domain->type) { |
2261 | case LTTNG_DOMAIN_LOG4J: | |
da6c3a50 | 2262 | default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME; |
0e115563 DG |
2263 | break; |
2264 | case LTTNG_DOMAIN_JUL: | |
da6c3a50 | 2265 | default_chan_name = DEFAULT_JUL_CHANNEL_NAME; |
0e115563 DG |
2266 | break; |
2267 | case LTTNG_DOMAIN_PYTHON: | |
2268 | default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
2269 | break; | |
2270 | default: | |
e98a44b0 | 2271 | /* The switch/case we are in makes this impossible */ |
0e115563 | 2272 | assert(0); |
da6c3a50 DG |
2273 | } |
2274 | ||
971da06a | 2275 | { |
8404118c | 2276 | char *filter_expression_copy = NULL; |
51755dc8 | 2277 | struct lttng_filter_bytecode *filter_copy = NULL; |
971da06a JG |
2278 | |
2279 | if (filter) { | |
51755dc8 JG |
2280 | const size_t filter_size = sizeof( |
2281 | struct lttng_filter_bytecode) | |
2282 | + filter->len; | |
2283 | ||
2284 | filter_copy = zmalloc(filter_size); | |
971da06a | 2285 | if (!filter_copy) { |
018096a4 | 2286 | ret = LTTNG_ERR_NOMEM; |
b742e3e2 | 2287 | goto error; |
971da06a | 2288 | } |
51755dc8 | 2289 | memcpy(filter_copy, filter, filter_size); |
971da06a | 2290 | |
8404118c JG |
2291 | filter_expression_copy = |
2292 | strdup(filter_expression); | |
2293 | if (!filter_expression) { | |
2294 | ret = LTTNG_ERR_NOMEM; | |
51755dc8 JG |
2295 | } |
2296 | ||
2297 | if (!filter_expression_copy || !filter_copy) { | |
2298 | free(filter_expression_copy); | |
2299 | free(filter_copy); | |
2300 | goto error; | |
8404118c | 2301 | } |
971da06a JG |
2302 | } |
2303 | ||
88f06f15 | 2304 | ret = cmd_enable_event_internal(session, &tmp_dom, |
971da06a | 2305 | (char *) default_chan_name, |
8404118c JG |
2306 | &uevent, filter_expression_copy, |
2307 | filter_copy, NULL, wpipe); | |
971da06a JG |
2308 | } |
2309 | ||
94382e15 JG |
2310 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2311 | goto already_enabled; | |
2312 | } else if (ret != LTTNG_OK) { | |
f20baf8e DG |
2313 | goto error; |
2314 | } | |
2315 | ||
2316 | /* The wild card * means that everything should be enabled. */ | |
2317 | if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) { | |
8404118c JG |
2318 | ret = event_agent_enable_all(usess, agt, event, filter, |
2319 | filter_expression); | |
f20baf8e | 2320 | } else { |
8404118c JG |
2321 | ret = event_agent_enable(usess, agt, event, filter, |
2322 | filter_expression); | |
f20baf8e | 2323 | } |
51755dc8 JG |
2324 | filter = NULL; |
2325 | filter_expression = NULL; | |
f20baf8e DG |
2326 | if (ret != LTTNG_OK) { |
2327 | goto error; | |
2328 | } | |
2329 | ||
2330 | break; | |
2331 | } | |
2f77fc4b | 2332 | default: |
f73fabfd | 2333 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2334 | goto error; |
2335 | } | |
2336 | ||
f73fabfd | 2337 | ret = LTTNG_OK; |
2f77fc4b | 2338 | |
94382e15 | 2339 | already_enabled: |
2f77fc4b | 2340 | error: |
49d21f93 MD |
2341 | free(filter_expression); |
2342 | free(filter); | |
2343 | free(exclusion); | |
cf0bcb51 | 2344 | channel_attr_destroy(attr); |
2223c96f | 2345 | rcu_read_unlock(); |
2f77fc4b DG |
2346 | return ret; |
2347 | } | |
2348 | ||
88f06f15 JG |
2349 | /* |
2350 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2351 | * We own filter, exclusion, and filter_expression. | |
2352 | */ | |
2353 | int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain, | |
2354 | char *channel_name, struct lttng_event *event, | |
2355 | char *filter_expression, | |
2356 | struct lttng_filter_bytecode *filter, | |
2357 | struct lttng_event_exclusion *exclusion, | |
2358 | int wpipe) | |
2359 | { | |
2360 | return _cmd_enable_event(session, domain, channel_name, event, | |
2361 | filter_expression, filter, exclusion, wpipe, false); | |
2362 | } | |
2363 | ||
2364 | /* | |
2365 | * Enable an event which is internal to LTTng. An internal should | |
2366 | * never be made visible to clients and are immune to checks such as | |
2367 | * reserved names. | |
2368 | */ | |
2369 | static int cmd_enable_event_internal(struct ltt_session *session, | |
2370 | struct lttng_domain *domain, | |
2371 | char *channel_name, struct lttng_event *event, | |
2372 | char *filter_expression, | |
2373 | struct lttng_filter_bytecode *filter, | |
2374 | struct lttng_event_exclusion *exclusion, | |
2375 | int wpipe) | |
2376 | { | |
2377 | return _cmd_enable_event(session, domain, channel_name, event, | |
2378 | filter_expression, filter, exclusion, wpipe, true); | |
2379 | } | |
2380 | ||
2f77fc4b DG |
2381 | /* |
2382 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2383 | */ | |
56a37563 JG |
2384 | ssize_t cmd_list_tracepoints(enum lttng_domain_type domain, |
2385 | struct lttng_event **events) | |
2f77fc4b DG |
2386 | { |
2387 | int ret; | |
2388 | ssize_t nb_events = 0; | |
2389 | ||
2390 | switch (domain) { | |
2391 | case LTTNG_DOMAIN_KERNEL: | |
2392 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2393 | if (nb_events < 0) { | |
f73fabfd | 2394 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
2f77fc4b DG |
2395 | goto error; |
2396 | } | |
2397 | break; | |
2398 | case LTTNG_DOMAIN_UST: | |
2399 | nb_events = ust_app_list_events(events); | |
2400 | if (nb_events < 0) { | |
f73fabfd | 2401 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2402 | goto error; |
2403 | } | |
2404 | break; | |
5cdb6027 | 2405 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2406 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2407 | case LTTNG_DOMAIN_PYTHON: |
f60140a1 | 2408 | nb_events = agent_list_events(events, domain); |
3c6a091f DG |
2409 | if (nb_events < 0) { |
2410 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2411 | goto error; | |
2412 | } | |
2413 | break; | |
2f77fc4b | 2414 | default: |
f73fabfd | 2415 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2416 | goto error; |
2417 | } | |
2418 | ||
2419 | return nb_events; | |
2420 | ||
2421 | error: | |
2422 | /* Return negative value to differentiate return code */ | |
2423 | return -ret; | |
2424 | } | |
2425 | ||
2426 | /* | |
2427 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
2428 | */ | |
56a37563 | 2429 | ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain, |
2f77fc4b DG |
2430 | struct lttng_event_field **fields) |
2431 | { | |
2432 | int ret; | |
2433 | ssize_t nb_fields = 0; | |
2434 | ||
2435 | switch (domain) { | |
2436 | case LTTNG_DOMAIN_UST: | |
2437 | nb_fields = ust_app_list_event_fields(fields); | |
2438 | if (nb_fields < 0) { | |
f73fabfd | 2439 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2440 | goto error; |
2441 | } | |
2442 | break; | |
2443 | case LTTNG_DOMAIN_KERNEL: | |
2444 | default: /* fall-through */ | |
f73fabfd | 2445 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2446 | goto error; |
2447 | } | |
2448 | ||
2449 | return nb_fields; | |
2450 | ||
2451 | error: | |
2452 | /* Return negative value to differentiate return code */ | |
2453 | return -ret; | |
2454 | } | |
2455 | ||
834978fd DG |
2456 | ssize_t cmd_list_syscalls(struct lttng_event **events) |
2457 | { | |
2458 | return syscall_table_list(events); | |
2459 | } | |
2460 | ||
a5dfbb9d MD |
2461 | /* |
2462 | * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread. | |
2463 | * | |
2464 | * Called with session lock held. | |
2465 | */ | |
2466 | ssize_t cmd_list_tracker_pids(struct ltt_session *session, | |
56a37563 | 2467 | enum lttng_domain_type domain, int32_t **pids) |
a5dfbb9d MD |
2468 | { |
2469 | int ret; | |
2470 | ssize_t nr_pids = 0; | |
2471 | ||
2472 | switch (domain) { | |
2473 | case LTTNG_DOMAIN_KERNEL: | |
2474 | { | |
2475 | struct ltt_kernel_session *ksess; | |
2476 | ||
2477 | ksess = session->kernel_session; | |
2478 | nr_pids = kernel_list_tracker_pids(ksess, pids); | |
2479 | if (nr_pids < 0) { | |
2480 | ret = LTTNG_ERR_KERN_LIST_FAIL; | |
2481 | goto error; | |
2482 | } | |
2483 | break; | |
2484 | } | |
2485 | case LTTNG_DOMAIN_UST: | |
2486 | { | |
2487 | struct ltt_ust_session *usess; | |
2488 | ||
2489 | usess = session->ust_session; | |
2490 | nr_pids = trace_ust_list_tracker_pids(usess, pids); | |
2491 | if (nr_pids < 0) { | |
2492 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2493 | goto error; | |
2494 | } | |
2495 | break; | |
2496 | } | |
2497 | case LTTNG_DOMAIN_LOG4J: | |
2498 | case LTTNG_DOMAIN_JUL: | |
2499 | case LTTNG_DOMAIN_PYTHON: | |
2500 | default: | |
2501 | ret = LTTNG_ERR_UND; | |
2502 | goto error; | |
2503 | } | |
2504 | ||
2505 | return nr_pids; | |
2506 | ||
2507 | error: | |
2508 | /* Return negative value to differentiate return code */ | |
2509 | return -ret; | |
2510 | } | |
2511 | ||
a1ae2ea5 JD |
2512 | static |
2513 | int domain_mkdir(const struct consumer_output *output, | |
2514 | const struct ltt_session *session, | |
2515 | uid_t uid, gid_t gid) | |
2516 | { | |
2517 | struct consumer_socket *socket; | |
2518 | struct lttng_ht_iter iter; | |
2519 | int ret; | |
b178f53e | 2520 | char path[LTTNG_PATH_MAX]; |
a1ae2ea5 JD |
2521 | |
2522 | if (!output || !output->socks) { | |
2523 | ERR("No consumer output found"); | |
2524 | ret = -1; | |
2525 | goto end; | |
2526 | } | |
2527 | ||
b178f53e | 2528 | ret = snprintf(path, sizeof(path), "%s/%s%s", |
a1ae2ea5 | 2529 | session_get_base_path(session), |
b178f53e JG |
2530 | output->chunk_path, |
2531 | output->domain_subdir); | |
a1ae2ea5 | 2532 | if (ret < 0 || ret >= LTTNG_PATH_MAX) { |
b178f53e | 2533 | ERR("Failed to format path new chunk domain path"); |
a1ae2ea5 JD |
2534 | ret = -1; |
2535 | goto end; | |
2536 | } | |
2537 | ||
2538 | DBG("Domain mkdir %s for session %" PRIu64, path, session->id); | |
2539 | rcu_read_lock(); | |
2540 | /* | |
2541 | * We have to iterate to find a socket, but we only need to send the | |
2542 | * rename command to one consumer, so we break after the first one. | |
2543 | */ | |
2544 | cds_lfht_for_each_entry(output->socks->ht, &iter.iter, socket, node.node) { | |
2545 | pthread_mutex_lock(socket->lock); | |
2546 | ret = consumer_mkdir(socket, session->id, output, path, uid, gid); | |
2547 | pthread_mutex_unlock(socket->lock); | |
2548 | if (ret) { | |
b178f53e | 2549 | ERR("Failed to create directory at \"%s\"", path); |
a1ae2ea5 JD |
2550 | ret = -1; |
2551 | goto end_unlock; | |
2552 | } | |
2553 | break; | |
2554 | } | |
2555 | ||
2556 | ret = 0; | |
2557 | ||
2558 | end_unlock: | |
2559 | rcu_read_unlock(); | |
2560 | end: | |
a1ae2ea5 JD |
2561 | return ret; |
2562 | } | |
2563 | ||
2f77fc4b DG |
2564 | /* |
2565 | * Command LTTNG_START_TRACE processed by the client thread. | |
a9ad0c8f MD |
2566 | * |
2567 | * Called with session mutex held. | |
2f77fc4b DG |
2568 | */ |
2569 | int cmd_start_trace(struct ltt_session *session) | |
2570 | { | |
82b69413 | 2571 | enum lttng_error_code ret; |
cde3e505 | 2572 | unsigned long nb_chan = 0; |
2f77fc4b DG |
2573 | struct ltt_kernel_session *ksession; |
2574 | struct ltt_ust_session *usess; | |
2f77fc4b DG |
2575 | |
2576 | assert(session); | |
2577 | ||
2578 | /* Ease our life a bit ;) */ | |
2579 | ksession = session->kernel_session; | |
2580 | usess = session->ust_session; | |
2581 | ||
8382cf6f DG |
2582 | /* Is the session already started? */ |
2583 | if (session->active) { | |
f73fabfd | 2584 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2585 | goto error; |
2586 | } | |
2587 | ||
cde3e505 DG |
2588 | /* |
2589 | * Starting a session without channel is useless since after that it's not | |
2590 | * possible to enable channel thus inform the client. | |
2591 | */ | |
2592 | if (usess && usess->domain_global.channels) { | |
2593 | nb_chan += lttng_ht_get_count(usess->domain_global.channels); | |
2594 | } | |
2595 | if (ksession) { | |
2596 | nb_chan += ksession->channel_count; | |
2597 | } | |
2598 | if (!nb_chan) { | |
2599 | ret = LTTNG_ERR_NO_CHANNEL; | |
2600 | goto error; | |
2601 | } | |
2602 | ||
82b69413 JG |
2603 | if (!session->has_been_started && session->output_traces) { |
2604 | ret = session_switch_trace_chunk(session, NULL, NULL); | |
2605 | if (ret != LTTNG_OK) { | |
5c408ad8 JD |
2606 | goto error; |
2607 | } | |
c996624c JD |
2608 | } |
2609 | ||
2f77fc4b DG |
2610 | /* Kernel tracing */ |
2611 | if (ksession != NULL) { | |
c996624c | 2612 | DBG("Start kernel tracing session %s", session->name); |
9b6c7ec5 DG |
2613 | ret = start_kernel_session(ksession, kernel_tracer_fd); |
2614 | if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2615 | goto error; |
2616 | } | |
2f77fc4b DG |
2617 | } |
2618 | ||
2619 | /* Flag session that trace should start automatically */ | |
2620 | if (usess) { | |
82b69413 JG |
2621 | int int_ret = ust_app_start_trace_all(usess); |
2622 | ||
2623 | if (int_ret < 0) { | |
f73fabfd | 2624 | ret = LTTNG_ERR_UST_START_FAIL; |
2f77fc4b DG |
2625 | goto error; |
2626 | } | |
2627 | } | |
2628 | ||
8382cf6f DG |
2629 | /* Flag this after a successful start. */ |
2630 | session->has_been_started = 1; | |
2631 | session->active = 1; | |
9b6c7ec5 | 2632 | |
5c408ad8 JD |
2633 | /* |
2634 | * Clear the flag that indicates that a rotation was done while the | |
2635 | * session was stopped. | |
2636 | */ | |
2637 | session->rotated_after_last_stop = false; | |
2638 | ||
259c2674 | 2639 | if (session->rotate_timer_period) { |
82b69413 JG |
2640 | int int_ret = timer_session_rotation_schedule_timer_start( |
2641 | session, session->rotate_timer_period); | |
2642 | ||
2643 | if (int_ret < 0) { | |
259c2674 JD |
2644 | ERR("Failed to enable rotate timer"); |
2645 | ret = LTTNG_ERR_UNK; | |
2646 | goto error; | |
2647 | } | |
2648 | } | |
2649 | ||
f73fabfd | 2650 | ret = LTTNG_OK; |
2f77fc4b DG |
2651 | |
2652 | error: | |
2653 | return ret; | |
2654 | } | |
2655 | ||
2656 | /* | |
2657 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2658 | */ | |
2659 | int cmd_stop_trace(struct ltt_session *session) | |
2660 | { | |
2661 | int ret; | |
2662 | struct ltt_kernel_channel *kchan; | |
2663 | struct ltt_kernel_session *ksession; | |
2664 | struct ltt_ust_session *usess; | |
a9577b76 | 2665 | bool error_occurred = false; |
2f77fc4b DG |
2666 | |
2667 | assert(session); | |
2668 | ||
5c408ad8 | 2669 | DBG("Begin stop session %s (id %" PRIu64 ")", session->name, session->id); |
2f77fc4b DG |
2670 | /* Short cut */ |
2671 | ksession = session->kernel_session; | |
2672 | usess = session->ust_session; | |
2673 | ||
8382cf6f DG |
2674 | /* Session is not active. Skip everythong and inform the client. */ |
2675 | if (!session->active) { | |
f73fabfd | 2676 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
2f77fc4b DG |
2677 | goto error; |
2678 | } | |
2679 | ||
2f77fc4b | 2680 | /* Kernel tracer */ |
14fb1ebe | 2681 | if (ksession && ksession->active) { |
2f77fc4b DG |
2682 | DBG("Stop kernel tracing"); |
2683 | ||
566d8970 MD |
2684 | ret = kernel_stop_session(ksession); |
2685 | if (ret < 0) { | |
2686 | ret = LTTNG_ERR_KERN_STOP_FAIL; | |
2687 | goto error; | |
2688 | } | |
2689 | ||
2690 | kernel_wait_quiescent(kernel_tracer_fd); | |
2691 | ||
2692 | /* Flush metadata after stopping (if exists) */ | |
2f77fc4b DG |
2693 | if (ksession->metadata_stream_fd >= 0) { |
2694 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2695 | if (ret < 0) { | |
2696 | ERR("Kernel metadata flush failed"); | |
2697 | } | |
2698 | } | |
2699 | ||
566d8970 | 2700 | /* Flush all buffers after stopping */ |
2f77fc4b DG |
2701 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2702 | ret = kernel_flush_buffer(kchan); | |
2703 | if (ret < 0) { | |
2704 | ERR("Kernel flush buffer error"); | |
2705 | } | |
2706 | } | |
2707 | ||
14fb1ebe | 2708 | ksession->active = 0; |
5c408ad8 JD |
2709 | DBG("Kernel session stopped %s (id %" PRIu64 ")", session->name, |
2710 | session->id); | |
2f77fc4b DG |
2711 | } |
2712 | ||
14fb1ebe | 2713 | if (usess && usess->active) { |
2f77fc4b DG |
2714 | ret = ust_app_stop_trace_all(usess); |
2715 | if (ret < 0) { | |
f73fabfd | 2716 | ret = LTTNG_ERR_UST_STOP_FAIL; |
2f77fc4b DG |
2717 | goto error; |
2718 | } | |
2719 | } | |
2720 | ||
8382cf6f DG |
2721 | /* Flag inactive after a successful stop. */ |
2722 | session->active = 0; | |
a9577b76 | 2723 | ret = !error_occurred ? LTTNG_OK : LTTNG_ERR_UNK; |
2f77fc4b DG |
2724 | |
2725 | error: | |
2726 | return ret; | |
2727 | } | |
2728 | ||
2729 | /* | |
2730 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
2731 | */ | |
bda32d56 JG |
2732 | int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri, |
2733 | struct lttng_uri *uris) | |
2f77fc4b DG |
2734 | { |
2735 | int ret, i; | |
2736 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2737 | struct ltt_ust_session *usess = session->ust_session; | |
2f77fc4b DG |
2738 | |
2739 | assert(session); | |
2740 | assert(uris); | |
2741 | assert(nb_uri > 0); | |
2742 | ||
8382cf6f DG |
2743 | /* Can't set consumer URI if the session is active. */ |
2744 | if (session->active) { | |
f73fabfd | 2745 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2746 | goto error; |
2747 | } | |
2748 | ||
bda32d56 | 2749 | /* Set the "global" consumer URIs */ |
2f77fc4b | 2750 | for (i = 0; i < nb_uri; i++) { |
b178f53e JG |
2751 | ret = add_uri_to_consumer(session, |
2752 | session->consumer, | |
2753 | &uris[i], LTTNG_DOMAIN_NONE); | |
a74934ba | 2754 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2755 | goto error; |
2756 | } | |
2f77fc4b DG |
2757 | } |
2758 | ||
bda32d56 JG |
2759 | /* Set UST session URIs */ |
2760 | if (session->ust_session) { | |
2761 | for (i = 0; i < nb_uri; i++) { | |
b178f53e | 2762 | ret = add_uri_to_consumer(session, |
bda32d56 | 2763 | session->ust_session->consumer, |
b178f53e | 2764 | &uris[i], LTTNG_DOMAIN_UST); |
bda32d56 JG |
2765 | if (ret != LTTNG_OK) { |
2766 | goto error; | |
2767 | } | |
2768 | } | |
2769 | } | |
2770 | ||
2771 | /* Set kernel session URIs */ | |
2772 | if (session->kernel_session) { | |
2773 | for (i = 0; i < nb_uri; i++) { | |
b178f53e | 2774 | ret = add_uri_to_consumer(session, |
bda32d56 | 2775 | session->kernel_session->consumer, |
b178f53e | 2776 | &uris[i], LTTNG_DOMAIN_KERNEL); |
bda32d56 JG |
2777 | if (ret != LTTNG_OK) { |
2778 | goto error; | |
2779 | } | |
2780 | } | |
2781 | } | |
2782 | ||
7ab70fe0 DG |
2783 | /* |
2784 | * Make sure to set the session in output mode after we set URI since a | |
2785 | * session can be created without URL (thus flagged in no output mode). | |
2786 | */ | |
2787 | session->output_traces = 1; | |
2788 | if (ksess) { | |
2789 | ksess->output_traces = 1; | |
bda32d56 JG |
2790 | } |
2791 | ||
2792 | if (usess) { | |
7ab70fe0 DG |
2793 | usess->output_traces = 1; |
2794 | } | |
2795 | ||
2f77fc4b | 2796 | /* All good! */ |
f73fabfd | 2797 | ret = LTTNG_OK; |
2f77fc4b DG |
2798 | |
2799 | error: | |
2800 | return ret; | |
2801 | } | |
2802 | ||
b178f53e JG |
2803 | static |
2804 | enum lttng_error_code set_session_output_from_descriptor( | |
2805 | struct ltt_session *session, | |
2806 | const struct lttng_session_descriptor *descriptor) | |
2f77fc4b DG |
2807 | { |
2808 | int ret; | |
b178f53e JG |
2809 | enum lttng_error_code ret_code = LTTNG_OK; |
2810 | enum lttng_session_descriptor_type session_type = | |
2811 | lttng_session_descriptor_get_type(descriptor); | |
2812 | enum lttng_session_descriptor_output_type output_type = | |
2813 | lttng_session_descriptor_get_output_type(descriptor); | |
2814 | struct lttng_uri uris[2] = {}; | |
2815 | size_t uri_count = 0; | |
2816 | ||
2817 | switch (output_type) { | |
2818 | case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NONE: | |
2819 | goto end; | |
2820 | case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_LOCAL: | |
2821 | lttng_session_descriptor_get_local_output_uri(descriptor, | |
2822 | &uris[0]); | |
2823 | uri_count = 1; | |
2824 | break; | |
2825 | case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NETWORK: | |
2826 | lttng_session_descriptor_get_network_output_uris(descriptor, | |
2827 | &uris[0], &uris[1]); | |
2828 | uri_count = 2; | |
2829 | break; | |
2830 | default: | |
2831 | ret_code = LTTNG_ERR_INVALID; | |
e32d7f27 | 2832 | goto end; |
2f77fc4b DG |
2833 | } |
2834 | ||
b178f53e JG |
2835 | switch (session_type) { |
2836 | case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT: | |
2837 | { | |
2838 | struct snapshot_output *new_output = NULL; | |
2839 | ||
2840 | new_output = snapshot_output_alloc(); | |
2841 | if (!new_output) { | |
2842 | ret_code = LTTNG_ERR_NOMEM; | |
2843 | goto end; | |
2844 | } | |
2845 | ||
2846 | ret = snapshot_output_init_with_uri(session, | |
2847 | DEFAULT_SNAPSHOT_MAX_SIZE, | |
2848 | NULL, uris, uri_count, session->consumer, | |
2849 | new_output, &session->snapshot); | |
2850 | if (ret < 0) { | |
2851 | ret_code = (ret == -ENOMEM) ? | |
2852 | LTTNG_ERR_NOMEM : LTTNG_ERR_INVALID; | |
2853 | snapshot_output_destroy(new_output); | |
2854 | goto end; | |
2855 | } | |
2856 | snapshot_add_output(&session->snapshot, new_output); | |
2857 | break; | |
2858 | } | |
2859 | case LTTNG_SESSION_DESCRIPTOR_TYPE_REGULAR: | |
2860 | case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE: | |
2861 | { | |
2862 | ret_code = cmd_set_consumer_uri(session, uri_count, uris); | |
2863 | break; | |
2864 | } | |
2865 | default: | |
2866 | ret_code = LTTNG_ERR_INVALID; | |
e32d7f27 | 2867 | goto end; |
2f77fc4b | 2868 | } |
b178f53e JG |
2869 | end: |
2870 | return ret_code; | |
2871 | } | |
2872 | ||
2873 | static | |
2874 | enum lttng_error_code cmd_create_session_from_descriptor( | |
2875 | struct lttng_session_descriptor *descriptor, | |
2876 | const lttng_sock_cred *creds, | |
2877 | const char *home_path) | |
2878 | { | |
2879 | int ret; | |
2880 | enum lttng_error_code ret_code; | |
2881 | const char *session_name; | |
2882 | struct ltt_session *new_session = NULL; | |
2883 | enum lttng_session_descriptor_status descriptor_status; | |
2f77fc4b | 2884 | |
e32d7f27 | 2885 | session_lock_list(); |
b178f53e JG |
2886 | if (home_path) { |
2887 | if (*home_path != '/') { | |
2888 | ERR("Home path provided by client is not absolute"); | |
2889 | ret_code = LTTNG_ERR_INVALID; | |
2890 | goto end; | |
2891 | } | |
2892 | } | |
2f77fc4b | 2893 | |
b178f53e JG |
2894 | descriptor_status = lttng_session_descriptor_get_session_name( |
2895 | descriptor, &session_name); | |
2896 | switch (descriptor_status) { | |
2897 | case LTTNG_SESSION_DESCRIPTOR_STATUS_OK: | |
2898 | break; | |
2899 | case LTTNG_SESSION_DESCRIPTOR_STATUS_UNSET: | |
2900 | session_name = NULL; | |
2901 | break; | |
2902 | default: | |
2903 | ret_code = LTTNG_ERR_INVALID; | |
2904 | goto end; | |
2905 | } | |
2906 | ret_code = session_create(session_name, creds->uid, creds->gid, | |
2907 | &new_session); | |
2908 | if (ret_code != LTTNG_OK) { | |
e32d7f27 | 2909 | goto end; |
2f77fc4b DG |
2910 | } |
2911 | ||
b178f53e JG |
2912 | if (!session_name) { |
2913 | ret = lttng_session_descriptor_set_session_name(descriptor, | |
2914 | new_session->name); | |
2915 | if (ret) { | |
2916 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
2917 | goto end; | |
2918 | } | |
2919 | } | |
2920 | ||
2921 | if (!lttng_session_descriptor_is_output_destination_initialized( | |
2922 | descriptor)) { | |
2923 | /* | |
2924 | * Only include the session's creation time in the output | |
2925 | * destination if the name of the session itself was | |
2926 | * not auto-generated. | |
2927 | */ | |
2928 | ret_code = lttng_session_descriptor_set_default_output( | |
2929 | descriptor, | |
2930 | session_name ? &new_session->creation_time : NULL, | |
2931 | home_path); | |
2932 | if (ret_code != LTTNG_OK) { | |
e32d7f27 | 2933 | goto end; |
2bba9e53 | 2934 | } |
2bba9e53 | 2935 | } else { |
b178f53e JG |
2936 | new_session->has_user_specified_directory = |
2937 | lttng_session_descriptor_has_output_directory( | |
2938 | descriptor); | |
2f77fc4b DG |
2939 | } |
2940 | ||
b178f53e JG |
2941 | switch (lttng_session_descriptor_get_type(descriptor)) { |
2942 | case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT: | |
2943 | new_session->snapshot_mode = 1; | |
2944 | break; | |
2945 | case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE: | |
2946 | new_session->live_timer = | |
2947 | lttng_session_descriptor_live_get_timer_interval( | |
2948 | descriptor); | |
2949 | break; | |
2950 | default: | |
2951 | break; | |
2952 | } | |
2f77fc4b | 2953 | |
b178f53e JG |
2954 | ret_code = set_session_output_from_descriptor(new_session, descriptor); |
2955 | if (ret_code != LTTNG_OK) { | |
2956 | goto end; | |
2957 | } | |
2958 | new_session->consumer->enabled = 1; | |
2959 | ret_code = LTTNG_OK; | |
e32d7f27 | 2960 | end: |
b178f53e JG |
2961 | /* Release reference provided by the session_create function. */ |
2962 | session_put(new_session); | |
2963 | if (ret_code != LTTNG_OK && new_session) { | |
2964 | /* Release the global reference on error. */ | |
2965 | session_destroy(new_session); | |
e32d7f27 | 2966 | } |
b178f53e JG |
2967 | session_unlock_list(); |
2968 | return ret_code; | |
2f77fc4b DG |
2969 | } |
2970 | ||
b178f53e JG |
2971 | enum lttng_error_code cmd_create_session(struct command_ctx *cmd_ctx, int sock, |
2972 | struct lttng_session_descriptor **return_descriptor) | |
27babd3a DG |
2973 | { |
2974 | int ret; | |
b178f53e JG |
2975 | size_t payload_size; |
2976 | struct lttng_dynamic_buffer payload; | |
2977 | struct lttng_buffer_view home_dir_view; | |
2978 | struct lttng_buffer_view session_descriptor_view; | |
2979 | struct lttng_session_descriptor *session_descriptor = NULL; | |
2980 | enum lttng_error_code ret_code; | |
2981 | ||
2982 | lttng_dynamic_buffer_init(&payload); | |
2983 | if (cmd_ctx->lsm->u.create_session.home_dir_size >= | |
2984 | LTTNG_PATH_MAX) { | |
2985 | ret_code = LTTNG_ERR_INVALID; | |
2986 | goto error; | |
27babd3a | 2987 | } |
b178f53e JG |
2988 | if (cmd_ctx->lsm->u.create_session.session_descriptor_size > |
2989 | LTTNG_SESSION_DESCRIPTOR_MAX_LEN) { | |
2990 | ret_code = LTTNG_ERR_INVALID; | |
2991 | goto error; | |
27babd3a DG |
2992 | } |
2993 | ||
b178f53e JG |
2994 | payload_size = cmd_ctx->lsm->u.create_session.home_dir_size + |
2995 | cmd_ctx->lsm->u.create_session.session_descriptor_size; | |
2996 | ret = lttng_dynamic_buffer_set_size(&payload, payload_size); | |
2997 | if (ret) { | |
2998 | ret_code = LTTNG_ERR_NOMEM; | |
2999 | goto error; | |
27babd3a DG |
3000 | } |
3001 | ||
b178f53e JG |
3002 | ret = lttcomm_recv_unix_sock(sock, payload.data, payload.size); |
3003 | if (ret <= 0) { | |
3004 | ERR("Reception of session descriptor failed, aborting."); | |
3005 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
3006 | goto error; | |
27babd3a DG |
3007 | } |
3008 | ||
b178f53e JG |
3009 | home_dir_view = lttng_buffer_view_from_dynamic_buffer( |
3010 | &payload, | |
3011 | 0, | |
3012 | cmd_ctx->lsm->u.create_session.home_dir_size); | |
3013 | session_descriptor_view = lttng_buffer_view_from_dynamic_buffer( | |
3014 | &payload, | |
3015 | cmd_ctx->lsm->u.create_session.home_dir_size, | |
3016 | cmd_ctx->lsm->u.create_session.session_descriptor_size); | |
27babd3a | 3017 | |
b178f53e JG |
3018 | ret = lttng_session_descriptor_create_from_buffer( |
3019 | &session_descriptor_view, &session_descriptor); | |
3020 | if (ret < 0) { | |
3021 | ERR("Failed to create session descriptor from payload of \"create session\" command"); | |
3022 | ret_code = LTTNG_ERR_INVALID; | |
3023 | goto error; | |
3024 | } | |
27babd3a | 3025 | |
b178f53e JG |
3026 | /* |
3027 | * Sets the descriptor's auto-generated properties (name, output) if | |
3028 | * needed. | |
3029 | */ | |
3030 | ret_code = cmd_create_session_from_descriptor(session_descriptor, | |
3031 | &cmd_ctx->creds, | |
3032 | home_dir_view.size ? home_dir_view.data : NULL); | |
3033 | if (ret_code != LTTNG_OK) { | |
3034 | goto error; | |
e32d7f27 | 3035 | } |
b178f53e JG |
3036 | |
3037 | ret_code = LTTNG_OK; | |
3038 | *return_descriptor = session_descriptor; | |
3039 | session_descriptor = NULL; | |
3040 | error: | |
3041 | lttng_dynamic_buffer_reset(&payload); | |
3042 | lttng_session_descriptor_destroy(session_descriptor); | |
3043 | return ret_code; | |
27babd3a DG |
3044 | } |
3045 | ||
2f77fc4b DG |
3046 | /* |
3047 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
a9ad0c8f MD |
3048 | * |
3049 | * Called with session lock held. | |
2f77fc4b | 3050 | */ |
e32d7f27 | 3051 | int cmd_destroy_session(struct ltt_session *session, |
90936dcf | 3052 | struct notification_thread_handle *notification_thread_handle) |
2f77fc4b DG |
3053 | { |
3054 | int ret; | |
2f77fc4b DG |
3055 | |
3056 | /* Safety net */ | |
3057 | assert(session); | |
3058 | ||
5c408ad8 JD |
3059 | DBG("Begin destroy session %s (id %" PRIu64 ")", session->name, session->id); |
3060 | ||
92816cc3 JG |
3061 | if (session->rotation_schedule_timer_enabled) { |
3062 | if (timer_session_rotation_schedule_timer_stop( | |
3063 | session)) { | |
3064 | ERR("Failed to stop the \"rotation schedule\" timer of session %s", | |
3065 | session->name); | |
3066 | } | |
259c2674 JD |
3067 | } |
3068 | ||
90936dcf JD |
3069 | if (session->rotate_size) { |
3070 | unsubscribe_session_consumed_size_rotation(session, notification_thread_handle); | |
3071 | session->rotate_size = 0; | |
3072 | } | |
3073 | ||
124473a3 JG |
3074 | if (session->current_archive_id != 0) { |
3075 | if (!session->rotated_after_last_stop) { | |
3076 | ret = cmd_rotate_session(session, NULL); | |
3077 | if (ret != LTTNG_OK) { | |
3078 | ERR("Failed to perform an implicit rotation as part of the rotation: %s", lttng_strerror(-ret)); | |
3079 | } | |
3080 | } else { | |
3081 | /* | |
3082 | * Rename the active chunk to ensure it has a name | |
3083 | * of the form ts_begin-ts_end-id. | |
3084 | * | |
3085 | * Note that no trace data has been produced since | |
3086 | * the last rotation; the directory should be | |
3087 | * removed. | |
3088 | */ | |
3089 | ret = rename_active_chunk(session); | |
3090 | if (ret) { | |
3091 | ERR("Failed to rename active chunk during the destruction of session \"%s\"", | |
3092 | session->name); | |
3093 | } | |
3094 | } | |
5c408ad8 JD |
3095 | } |
3096 | ||
a503e1ef JG |
3097 | if (session->shm_path[0]) { |
3098 | /* | |
3099 | * When a session is created with an explicit shm_path, | |
3100 | * the consumer daemon will create its shared memory files | |
3101 | * at that location and will *not* unlink them. This is normal | |
3102 | * as the intention of that feature is to make it possible | |
3103 | * to retrieve the content of those files should a crash occur. | |
3104 | * | |
3105 | * To ensure the content of those files can be used, the | |
3106 | * sessiond daemon will replicate the content of the metadata | |
3107 | * cache in a metadata file. | |
3108 | * | |
3109 | * On clean-up, it is expected that the consumer daemon will | |
3110 | * unlink the shared memory files and that the session daemon | |
3111 | * will unlink the metadata file. Then, the session's directory | |
3112 | * in the shm path can be removed. | |
3113 | * | |
3114 | * Unfortunately, a flaw in the design of the sessiond's and | |
3115 | * consumerd's tear down of channels makes it impossible to | |
3116 | * determine when the sessiond _and_ the consumerd have both | |
3117 | * destroyed their representation of a channel. For one, the | |
3118 | * unlinking, close, and rmdir happen in deferred 'call_rcu' | |
3119 | * callbacks in both daemons. | |
3120 | * | |
3121 | * However, it is also impossible for the sessiond to know when | |
3122 | * the consumer daemon is done destroying its channel(s) since | |
3123 | * it occurs as a reaction to the closing of the channel's file | |
3124 | * descriptor. There is no resulting communication initiated | |
3125 | * from the consumerd to the sessiond to confirm that the | |
3126 | * operation is completed (and was successful). | |
3127 | * | |
3128 | * Until this is all fixed, the session daemon checks for the | |
3129 | * removal of the session's shm path which makes it possible | |
3130 | * to safely advertise a session as having been destroyed. | |
3131 | * | |
3132 | * Prior to this fix, it was not possible to reliably save | |
3133 | * a session making use of the --shm-path option, destroy it, | |
3134 | * and load it again. This is because the creation of the | |
3135 | * session would fail upon seeing the session's shm path | |
3136 | * already in existence. | |
3137 | * | |
3138 | * Note that none of the error paths in the check for the | |
3139 | * directory's existence return an error. This is normal | |
3140 | * as there isn't much that can be done. The session will | |
3141 | * be destroyed properly, except that we can't offer the | |
3142 | * guarantee that the same session can be re-created. | |
3143 | */ | |
3144 | current_completion_handler = &destroy_completion_handler.handler; | |
3145 | ret = lttng_strncpy(destroy_completion_handler.shm_path, | |
3146 | session->shm_path, | |
3147 | sizeof(destroy_completion_handler.shm_path)); | |
3148 | assert(!ret); | |
3149 | } | |
e32d7f27 JG |
3150 | |
3151 | /* | |
3152 | * The session is destroyed. However, note that the command context | |
3153 | * still holds a reference to the session, thus delaying its destruction | |
3154 | * _at least_ up to the point when that reference is released. | |
3155 | */ | |
3156 | session_destroy(session); | |
3157 | ret = LTTNG_OK; | |
2f77fc4b DG |
3158 | |
3159 | return ret; | |
3160 | } | |
3161 | ||
2f77fc4b DG |
3162 | /* |
3163 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
3164 | */ | |
56a37563 JG |
3165 | int cmd_register_consumer(struct ltt_session *session, |
3166 | enum lttng_domain_type domain, const char *sock_path, | |
3167 | struct consumer_data *cdata) | |
2f77fc4b DG |
3168 | { |
3169 | int ret, sock; | |
dd81b457 | 3170 | struct consumer_socket *socket = NULL; |
2f77fc4b DG |
3171 | |
3172 | assert(session); | |
3173 | assert(cdata); | |
3174 | assert(sock_path); | |
3175 | ||
3176 | switch (domain) { | |
3177 | case LTTNG_DOMAIN_KERNEL: | |
3178 | { | |
3179 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3180 | ||
3181 | assert(ksess); | |
3182 | ||
3183 | /* Can't register a consumer if there is already one */ | |
3184 | if (ksess->consumer_fds_sent != 0) { | |
f73fabfd | 3185 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
3186 | goto error; |
3187 | } | |
3188 | ||
3189 | sock = lttcomm_connect_unix_sock(sock_path); | |
3190 | if (sock < 0) { | |
f73fabfd | 3191 | ret = LTTNG_ERR_CONNECT_FAIL; |
2f77fc4b DG |
3192 | goto error; |
3193 | } | |
4ce514c4 | 3194 | cdata->cmd_sock = sock; |
2f77fc4b | 3195 | |
4ce514c4 | 3196 | socket = consumer_allocate_socket(&cdata->cmd_sock); |
2f77fc4b | 3197 | if (socket == NULL) { |
f66c074c DG |
3198 | ret = close(sock); |
3199 | if (ret < 0) { | |
3200 | PERROR("close register consumer"); | |
3201 | } | |
4ce514c4 | 3202 | cdata->cmd_sock = -1; |
f73fabfd | 3203 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
3204 | goto error; |
3205 | } | |
3206 | ||
3207 | socket->lock = zmalloc(sizeof(pthread_mutex_t)); | |
3208 | if (socket->lock == NULL) { | |
3209 | PERROR("zmalloc pthread mutex"); | |
f73fabfd | 3210 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
3211 | goto error; |
3212 | } | |
3213 | pthread_mutex_init(socket->lock, NULL); | |
3214 | socket->registered = 1; | |
3215 | ||
3216 | rcu_read_lock(); | |
3217 | consumer_add_socket(socket, ksess->consumer); | |
3218 | rcu_read_unlock(); | |
3219 | ||
3220 | pthread_mutex_lock(&cdata->pid_mutex); | |
3221 | cdata->pid = -1; | |
3222 | pthread_mutex_unlock(&cdata->pid_mutex); | |
3223 | ||
3224 | break; | |
3225 | } | |
3226 | default: | |
3227 | /* TODO: Userspace tracing */ | |
f73fabfd | 3228 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3229 | goto error; |
3230 | } | |
3231 | ||
dd81b457 | 3232 | return LTTNG_OK; |
2f77fc4b DG |
3233 | |
3234 | error: | |
dd81b457 DG |
3235 | if (socket) { |
3236 | consumer_destroy_socket(socket); | |
3237 | } | |
2f77fc4b DG |
3238 | return ret; |
3239 | } | |
3240 | ||
3241 | /* | |
3242 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
3243 | */ | |
3244 | ssize_t cmd_list_domains(struct ltt_session *session, | |
3245 | struct lttng_domain **domains) | |
3246 | { | |
3247 | int ret, index = 0; | |
3248 | ssize_t nb_dom = 0; | |
fefd409b DG |
3249 | struct agent *agt; |
3250 | struct lttng_ht_iter iter; | |
2f77fc4b DG |
3251 | |
3252 | if (session->kernel_session != NULL) { | |
3253 | DBG3("Listing domains found kernel domain"); | |
3254 | nb_dom++; | |
3255 | } | |
3256 | ||
3257 | if (session->ust_session != NULL) { | |
3258 | DBG3("Listing domains found UST global domain"); | |
3259 | nb_dom++; | |
3c6a091f | 3260 | |
e0a74f01 | 3261 | rcu_read_lock(); |
fefd409b DG |
3262 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
3263 | agt, node.node) { | |
3264 | if (agt->being_used) { | |
3265 | nb_dom++; | |
3266 | } | |
3c6a091f | 3267 | } |
e0a74f01 | 3268 | rcu_read_unlock(); |
2f77fc4b DG |
3269 | } |
3270 | ||
fa64dfb4 JG |
3271 | if (!nb_dom) { |
3272 | goto end; | |
3273 | } | |
3274 | ||
2f77fc4b DG |
3275 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
3276 | if (*domains == NULL) { | |
f73fabfd | 3277 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
3278 | goto error; |
3279 | } | |
3280 | ||
3281 | if (session->kernel_session != NULL) { | |
3282 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
b5edb9e8 PP |
3283 | |
3284 | /* Kernel session buffer type is always GLOBAL */ | |
3285 | (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL; | |
3286 | ||
2f77fc4b DG |
3287 | index++; |
3288 | } | |
3289 | ||
3290 | if (session->ust_session != NULL) { | |
3291 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
88c5f0d8 | 3292 | (*domains)[index].buf_type = session->ust_session->buffer_type; |
2f77fc4b | 3293 | index++; |
3c6a091f | 3294 | |
e0a74f01 | 3295 | rcu_read_lock(); |
fefd409b DG |
3296 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
3297 | agt, node.node) { | |
3298 | if (agt->being_used) { | |
3299 | (*domains)[index].type = agt->domain; | |
3300 | (*domains)[index].buf_type = session->ust_session->buffer_type; | |
3301 | index++; | |
3302 | } | |
3c6a091f | 3303 | } |
e0a74f01 | 3304 | rcu_read_unlock(); |
2f77fc4b | 3305 | } |
fa64dfb4 | 3306 | end: |
2f77fc4b DG |
3307 | return nb_dom; |
3308 | ||
3309 | error: | |
f73fabfd DG |
3310 | /* Return negative value to differentiate return code */ |
3311 | return -ret; | |
2f77fc4b DG |
3312 | } |
3313 | ||
3314 | ||
3315 | /* | |
3316 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
3317 | */ | |
56a37563 JG |
3318 | ssize_t cmd_list_channels(enum lttng_domain_type domain, |
3319 | struct ltt_session *session, struct lttng_channel **channels) | |
2f77fc4b | 3320 | { |
53e367f9 | 3321 | ssize_t nb_chan = 0, payload_size = 0, ret; |
2f77fc4b DG |
3322 | |
3323 | switch (domain) { | |
3324 | case LTTNG_DOMAIN_KERNEL: | |
3325 | if (session->kernel_session != NULL) { | |
3326 | nb_chan = session->kernel_session->channel_count; | |
3327 | } | |
3328 | DBG3("Number of kernel channels %zd", nb_chan); | |
c7d620a2 | 3329 | if (nb_chan <= 0) { |
53e367f9 JG |
3330 | ret = -LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
3331 | goto end; | |
c7d620a2 | 3332 | } |
2f77fc4b DG |
3333 | break; |
3334 | case LTTNG_DOMAIN_UST: | |
3335 | if (session->ust_session != NULL) { | |
7ffc31a2 | 3336 | rcu_read_lock(); |
2f77fc4b | 3337 | nb_chan = lttng_ht_get_count( |
7ffc31a2 JG |
3338 | session->ust_session->domain_global.channels); |
3339 | rcu_read_unlock(); | |
2f77fc4b DG |
3340 | } |
3341 | DBG3("Number of UST global channels %zd", nb_chan); | |
ade7ce52 | 3342 | if (nb_chan < 0) { |
53e367f9 JG |
3343 | ret = -LTTNG_ERR_UST_CHAN_NOT_FOUND; |
3344 | goto end; | |
c7d620a2 | 3345 | } |
2f77fc4b DG |
3346 | break; |
3347 | default: | |
53e367f9 JG |
3348 | ret = -LTTNG_ERR_UND; |
3349 | goto end; | |
2f77fc4b DG |
3350 | } |
3351 | ||
3352 | if (nb_chan > 0) { | |
53e367f9 | 3353 | const size_t channel_size = sizeof(struct lttng_channel) + |
cf0bcb51 JG |
3354 | sizeof(struct lttng_channel_extended); |
3355 | struct lttng_channel_extended *channel_exts; | |
53e367f9 JG |
3356 | |
3357 | payload_size = nb_chan * channel_size; | |
3358 | *channels = zmalloc(payload_size); | |
2f77fc4b | 3359 | if (*channels == NULL) { |
53e367f9 JG |
3360 | ret = -LTTNG_ERR_FATAL; |
3361 | goto end; | |
2f77fc4b DG |
3362 | } |
3363 | ||
53e367f9 JG |
3364 | channel_exts = ((void *) *channels) + |
3365 | (nb_chan * sizeof(struct lttng_channel)); | |
d449df4a MD |
3366 | ret = list_lttng_channels(domain, session, *channels, channel_exts); |
3367 | if (ret != LTTNG_OK) { | |
3368 | free(*channels); | |
3369 | *channels = NULL; | |
3370 | goto end; | |
3371 | } | |
53e367f9 JG |
3372 | } else { |
3373 | *channels = NULL; | |
2f77fc4b DG |
3374 | } |
3375 | ||
53e367f9 JG |
3376 | ret = payload_size; |
3377 | end: | |
3378 | return ret; | |
2f77fc4b DG |
3379 | } |
3380 | ||
3381 | /* | |
3382 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3383 | */ | |
56a37563 JG |
3384 | ssize_t cmd_list_events(enum lttng_domain_type domain, |
3385 | struct ltt_session *session, char *channel_name, | |
b4e3ceb9 | 3386 | struct lttng_event **events, size_t *total_size) |
2f77fc4b DG |
3387 | { |
3388 | int ret = 0; | |
3389 | ssize_t nb_event = 0; | |
3390 | ||
3391 | switch (domain) { | |
3392 | case LTTNG_DOMAIN_KERNEL: | |
3393 | if (session->kernel_session != NULL) { | |
3394 | nb_event = list_lttng_kernel_events(channel_name, | |
b4e3ceb9 PP |
3395 | session->kernel_session, events, |
3396 | total_size); | |
2f77fc4b DG |
3397 | } |
3398 | break; | |
3399 | case LTTNG_DOMAIN_UST: | |
3400 | { | |
3401 | if (session->ust_session != NULL) { | |
3402 | nb_event = list_lttng_ust_global_events(channel_name, | |
b4e3ceb9 PP |
3403 | &session->ust_session->domain_global, events, |
3404 | total_size); | |
2f77fc4b DG |
3405 | } |
3406 | break; | |
3407 | } | |
5cdb6027 | 3408 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 3409 | case LTTNG_DOMAIN_JUL: |
0e115563 | 3410 | case LTTNG_DOMAIN_PYTHON: |
3c6a091f | 3411 | if (session->ust_session) { |
fefd409b DG |
3412 | struct lttng_ht_iter iter; |
3413 | struct agent *agt; | |
3414 | ||
b11feea5 | 3415 | rcu_read_lock(); |
fefd409b DG |
3416 | cds_lfht_for_each_entry(session->ust_session->agents->ht, |
3417 | &iter.iter, agt, node.node) { | |
1dfd9906 JG |
3418 | if (agt->domain == domain) { |
3419 | nb_event = list_lttng_agent_events( | |
b4e3ceb9 PP |
3420 | agt, events, |
3421 | total_size); | |
1dfd9906 JG |
3422 | break; |
3423 | } | |
fefd409b | 3424 | } |
b11feea5 | 3425 | rcu_read_unlock(); |
3c6a091f DG |
3426 | } |
3427 | break; | |
2f77fc4b | 3428 | default: |
f73fabfd | 3429 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3430 | goto error; |
3431 | } | |
3432 | ||
f73fabfd | 3433 | return nb_event; |
2f77fc4b DG |
3434 | |
3435 | error: | |
f73fabfd DG |
3436 | /* Return negative value to differentiate return code */ |
3437 | return -ret; | |
2f77fc4b DG |
3438 | } |
3439 | ||
3440 | /* | |
3441 | * Using the session list, filled a lttng_session array to send back to the | |
3442 | * client for session listing. | |
3443 | * | |
3444 | * The session list lock MUST be acquired before calling this function. Use | |
3445 | * session_lock_list() and session_unlock_list(). | |
3446 | */ | |
b178f53e JG |
3447 | void cmd_list_lttng_sessions(struct lttng_session *sessions, |
3448 | size_t session_count, uid_t uid, gid_t gid) | |
2f77fc4b DG |
3449 | { |
3450 | int ret; | |
3451 | unsigned int i = 0; | |
3452 | struct ltt_session *session; | |
3453 | struct ltt_session_list *list = session_get_list(); | |
b178f53e JG |
3454 | struct lttng_session_extended *extended = |
3455 | (typeof(extended)) (&sessions[session_count]); | |
2f77fc4b DG |
3456 | |
3457 | DBG("Getting all available session for UID %d GID %d", | |
3458 | uid, gid); | |
3459 | /* | |
3460 | * Iterate over session list and append data after the control struct in | |
3461 | * the buffer. | |
3462 | */ | |
3463 | cds_list_for_each_entry(session, &list->head, list) { | |
e32d7f27 JG |
3464 | if (!session_get(session)) { |
3465 | continue; | |
3466 | } | |
2f77fc4b DG |
3467 | /* |
3468 | * Only list the sessions the user can control. | |
3469 | */ | |
e32d7f27 JG |
3470 | if (!session_access_ok(session, uid, gid) || |
3471 | session->destroyed) { | |
3472 | session_put(session); | |
2f77fc4b DG |
3473 | continue; |
3474 | } | |
3475 | ||
3476 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3477 | struct ltt_ust_session *usess = session->ust_session; | |
3478 | ||
3479 | if (session->consumer->type == CONSUMER_DST_NET || | |
3480 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
3481 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
3482 | ret = build_network_session_path(sessions[i].path, | |
dec56f6c | 3483 | sizeof(sessions[i].path), session); |
2f77fc4b | 3484 | } else { |
dec56f6c | 3485 | ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s", |
366a9222 | 3486 | session->consumer->dst.session_root_path); |
2f77fc4b DG |
3487 | } |
3488 | if (ret < 0) { | |
3489 | PERROR("snprintf session path"); | |
e32d7f27 | 3490 | session_put(session); |
2f77fc4b DG |
3491 | continue; |
3492 | } | |
3493 | ||
3494 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
3495 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
8382cf6f | 3496 | sessions[i].enabled = session->active; |
2cbf8fed | 3497 | sessions[i].snapshot_mode = session->snapshot_mode; |
8960e9cd | 3498 | sessions[i].live_timer_interval = session->live_timer; |
b178f53e JG |
3499 | extended[i].creation_time.value = (uint64_t) session->creation_time; |
3500 | extended[i].creation_time.is_set = 1; | |
2f77fc4b | 3501 | i++; |
e32d7f27 | 3502 | session_put(session); |
2f77fc4b DG |
3503 | } |
3504 | } | |
3505 | ||
806e2684 | 3506 | /* |
6d805429 | 3507 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
d3f14b8a | 3508 | * ready for trace analysis (or any kind of reader) or else 1 for pending data. |
806e2684 | 3509 | */ |
6d805429 | 3510 | int cmd_data_pending(struct ltt_session *session) |
806e2684 DG |
3511 | { |
3512 | int ret; | |
3513 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3514 | struct ltt_ust_session *usess = session->ust_session; | |
3515 | ||
3516 | assert(session); | |
3517 | ||
5c408ad8 JD |
3518 | DBG("Data pending for session %s", session->name); |
3519 | ||
806e2684 | 3520 | /* Session MUST be stopped to ask for data availability. */ |
8382cf6f | 3521 | if (session->active) { |
806e2684 DG |
3522 | ret = LTTNG_ERR_SESSION_STARTED; |
3523 | goto error; | |
3a89d11a DG |
3524 | } else { |
3525 | /* | |
3526 | * If stopped, just make sure we've started before else the above call | |
3527 | * will always send that there is data pending. | |
3528 | * | |
3529 | * The consumer assumes that when the data pending command is received, | |
3530 | * the trace has been started before or else no output data is written | |
3531 | * by the streams which is a condition for data pending. So, this is | |
3532 | * *VERY* important that we don't ask the consumer before a start | |
3533 | * trace. | |
3534 | */ | |
8382cf6f | 3535 | if (!session->has_been_started) { |
3a89d11a DG |
3536 | ret = 0; |
3537 | goto error; | |
3538 | } | |
806e2684 DG |
3539 | } |
3540 | ||
92816cc3 JG |
3541 | /* A rotation is still pending, we have to wait. */ |
3542 | if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) { | |
5c408ad8 JD |
3543 | DBG("Rotate still pending for session %s", session->name); |
3544 | ret = 1; | |
3545 | goto error; | |
3546 | } | |
3547 | ||
806e2684 | 3548 | if (ksess && ksess->consumer) { |
6d805429 DG |
3549 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
3550 | if (ret == 1) { | |
806e2684 DG |
3551 | /* Data is still being extracted for the kernel. */ |
3552 | goto error; | |
3553 | } | |
3554 | } | |
3555 | ||
3556 | if (usess && usess->consumer) { | |
6d805429 DG |
3557 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
3558 | if (ret == 1) { | |
806e2684 DG |
3559 | /* Data is still being extracted for the kernel. */ |
3560 | goto error; | |
3561 | } | |
3562 | } | |
3563 | ||
3564 | /* Data is ready to be read by a viewer */ | |
6d805429 | 3565 | ret = 0; |
806e2684 DG |
3566 | |
3567 | error: | |
3568 | return ret; | |
3569 | } | |
3570 | ||
6dc3064a DG |
3571 | /* |
3572 | * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library. | |
3573 | * | |
3574 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3575 | */ | |
3576 | int cmd_snapshot_add_output(struct ltt_session *session, | |
3577 | struct lttng_snapshot_output *output, uint32_t *id) | |
3578 | { | |
3579 | int ret; | |
3580 | struct snapshot_output *new_output; | |
3581 | ||
3582 | assert(session); | |
3583 | assert(output); | |
3584 | ||
3585 | DBG("Cmd snapshot add output for session %s", session->name); | |
3586 | ||
3587 | /* | |
903ef685 | 3588 | * Can't create an output if the session is not set in no-output mode. |
6dc3064a DG |
3589 | */ |
3590 | if (session->output_traces) { | |
903ef685 | 3591 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3592 | goto error; |
3593 | } | |
3594 | ||
54213acc JG |
3595 | if (session->has_non_mmap_channel) { |
3596 | ret = LTTNG_ERR_SNAPSHOT_UNSUPPORTED; | |
3597 | goto error; | |
3598 | } | |
3599 | ||
6dc3064a DG |
3600 | /* Only one output is allowed until we have the "tee" feature. */ |
3601 | if (session->snapshot.nb_output == 1) { | |
3602 | ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST; | |
3603 | goto error; | |
3604 | } | |
3605 | ||
3606 | new_output = snapshot_output_alloc(); | |
3607 | if (!new_output) { | |
3608 | ret = LTTNG_ERR_NOMEM; | |
3609 | goto error; | |
3610 | } | |
3611 | ||
b178f53e | 3612 | ret = snapshot_output_init(session, output->max_size, output->name, |
6dc3064a DG |
3613 | output->ctrl_url, output->data_url, session->consumer, new_output, |
3614 | &session->snapshot); | |
3615 | if (ret < 0) { | |
3616 | if (ret == -ENOMEM) { | |
3617 | ret = LTTNG_ERR_NOMEM; | |
3618 | } else { | |
3619 | ret = LTTNG_ERR_INVALID; | |
3620 | } | |
3621 | goto free_error; | |
3622 | } | |
3623 | ||
6dc3064a DG |
3624 | rcu_read_lock(); |
3625 | snapshot_add_output(&session->snapshot, new_output); | |
3626 | if (id) { | |
3627 | *id = new_output->id; | |
3628 | } | |
3629 | rcu_read_unlock(); | |
3630 | ||
3631 | return LTTNG_OK; | |
3632 | ||
3633 | free_error: | |
3634 | snapshot_output_destroy(new_output); | |
3635 | error: | |
3636 | return ret; | |
3637 | } | |
3638 | ||
3639 | /* | |
3640 | * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl. | |
3641 | * | |
3642 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3643 | */ | |
3644 | int cmd_snapshot_del_output(struct ltt_session *session, | |
3645 | struct lttng_snapshot_output *output) | |
3646 | { | |
3647 | int ret; | |
eb240553 | 3648 | struct snapshot_output *sout = NULL; |
6dc3064a DG |
3649 | |
3650 | assert(session); | |
3651 | assert(output); | |
3652 | ||
6dc3064a DG |
3653 | rcu_read_lock(); |
3654 | ||
3655 | /* | |
d3f14b8a MD |
3656 | * Permission denied to create an output if the session is not |
3657 | * set in no output mode. | |
6dc3064a DG |
3658 | */ |
3659 | if (session->output_traces) { | |
903ef685 | 3660 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3661 | goto error; |
3662 | } | |
3663 | ||
eb240553 DG |
3664 | if (output->id) { |
3665 | DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id, | |
3666 | session->name); | |
3667 | sout = snapshot_find_output_by_id(output->id, &session->snapshot); | |
3668 | } else if (*output->name != '\0') { | |
3669 | DBG("Cmd snapshot del output name %s for session %s", output->name, | |
3670 | session->name); | |
3671 | sout = snapshot_find_output_by_name(output->name, &session->snapshot); | |
3672 | } | |
6dc3064a DG |
3673 | if (!sout) { |
3674 | ret = LTTNG_ERR_INVALID; | |
3675 | goto error; | |
3676 | } | |
3677 | ||
3678 | snapshot_delete_output(&session->snapshot, sout); | |
3679 | snapshot_output_destroy(sout); | |
3680 | ret = LTTNG_OK; | |
3681 | ||
3682 | error: | |
3683 | rcu_read_unlock(); | |
3684 | return ret; | |
3685 | } | |
3686 | ||
3687 | /* | |
3688 | * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl. | |
3689 | * | |
3690 | * If no output is available, outputs is untouched and 0 is returned. | |
3691 | * | |
3692 | * Return the size of the newly allocated outputs or a negative LTTNG_ERR code. | |
3693 | */ | |
3694 | ssize_t cmd_snapshot_list_outputs(struct ltt_session *session, | |
3695 | struct lttng_snapshot_output **outputs) | |
3696 | { | |
3697 | int ret, idx = 0; | |
b223ca94 | 3698 | struct lttng_snapshot_output *list = NULL; |
6dc3064a DG |
3699 | struct lttng_ht_iter iter; |
3700 | struct snapshot_output *output; | |
3701 | ||
3702 | assert(session); | |
3703 | assert(outputs); | |
3704 | ||
3705 | DBG("Cmd snapshot list outputs for session %s", session->name); | |
3706 | ||
3707 | /* | |
d3f14b8a MD |
3708 | * Permission denied to create an output if the session is not |
3709 | * set in no output mode. | |
6dc3064a DG |
3710 | */ |
3711 | if (session->output_traces) { | |
903ef685 JG |
3712 | ret = -LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
3713 | goto end; | |
6dc3064a DG |
3714 | } |
3715 | ||
3716 | if (session->snapshot.nb_output == 0) { | |
3717 | ret = 0; | |
903ef685 | 3718 | goto end; |
6dc3064a DG |
3719 | } |
3720 | ||
3721 | list = zmalloc(session->snapshot.nb_output * sizeof(*list)); | |
3722 | if (!list) { | |
b223ca94 | 3723 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3724 | goto end; |
6dc3064a DG |
3725 | } |
3726 | ||
3727 | /* Copy list from session to the new list object. */ | |
b223ca94 | 3728 | rcu_read_lock(); |
6dc3064a DG |
3729 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter, |
3730 | output, node.node) { | |
3731 | assert(output->consumer); | |
3732 | list[idx].id = output->id; | |
3733 | list[idx].max_size = output->max_size; | |
6ce22875 MD |
3734 | if (lttng_strncpy(list[idx].name, output->name, |
3735 | sizeof(list[idx].name))) { | |
3736 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 3737 | goto error; |
6ce22875 | 3738 | } |
6dc3064a | 3739 | if (output->consumer->type == CONSUMER_DST_LOCAL) { |
6ce22875 | 3740 | if (lttng_strncpy(list[idx].ctrl_url, |
366a9222 | 3741 | output->consumer->dst.session_root_path, |
6ce22875 MD |
3742 | sizeof(list[idx].ctrl_url))) { |
3743 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 3744 | goto error; |
6ce22875 | 3745 | } |
6dc3064a DG |
3746 | } else { |
3747 | /* Control URI. */ | |
3748 | ret = uri_to_str_url(&output->consumer->dst.net.control, | |
3749 | list[idx].ctrl_url, sizeof(list[idx].ctrl_url)); | |
3750 | if (ret < 0) { | |
b223ca94 | 3751 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3752 | goto error; |
6dc3064a DG |
3753 | } |
3754 | ||
3755 | /* Data URI. */ | |
3756 | ret = uri_to_str_url(&output->consumer->dst.net.data, | |
3757 | list[idx].data_url, sizeof(list[idx].data_url)); | |
3758 | if (ret < 0) { | |
b223ca94 | 3759 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3760 | goto error; |
6dc3064a DG |
3761 | } |
3762 | } | |
3763 | idx++; | |
3764 | } | |
3765 | ||
3766 | *outputs = list; | |
b223ca94 JG |
3767 | list = NULL; |
3768 | ret = session->snapshot.nb_output; | |
6dc3064a | 3769 | error: |
903ef685 | 3770 | rcu_read_unlock(); |
b223ca94 | 3771 | free(list); |
903ef685 | 3772 | end: |
b223ca94 | 3773 | return ret; |
6dc3064a DG |
3774 | } |
3775 | ||
93ec662e JD |
3776 | /* |
3777 | * Check if we can regenerate the metadata for this session. | |
3778 | * Only kernel, UST per-uid and non-live sessions are supported. | |
3779 | * | |
3780 | * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise. | |
3781 | */ | |
3782 | static | |
eded6438 | 3783 | int check_regenerate_metadata_support(struct ltt_session *session) |
93ec662e JD |
3784 | { |
3785 | int ret; | |
3786 | ||
3787 | assert(session); | |
3788 | ||
3789 | if (session->live_timer != 0) { | |
3790 | ret = LTTNG_ERR_LIVE_SESSION; | |
3791 | goto end; | |
3792 | } | |
3793 | if (!session->active) { | |
3794 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
3795 | goto end; | |
3796 | } | |
3797 | if (session->ust_session) { | |
3798 | switch (session->ust_session->buffer_type) { | |
3799 | case LTTNG_BUFFER_PER_UID: | |
3800 | break; | |
3801 | case LTTNG_BUFFER_PER_PID: | |
3802 | ret = LTTNG_ERR_PER_PID_SESSION; | |
3803 | goto end; | |
3804 | default: | |
3805 | assert(0); | |
3806 | ret = LTTNG_ERR_UNK; | |
3807 | goto end; | |
3808 | } | |
3809 | } | |
3810 | if (session->consumer->type == CONSUMER_DST_NET && | |
3811 | session->consumer->relay_minor_version < 8) { | |
3812 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; | |
3813 | goto end; | |
3814 | } | |
3815 | ret = 0; | |
3816 | ||
3817 | end: | |
3818 | return ret; | |
3819 | } | |
3820 | ||
7802bae3 LL |
3821 | static |
3822 | int clear_metadata_file(int fd) | |
3823 | { | |
3824 | int ret; | |
a5df8828 | 3825 | off_t lseek_ret; |
7802bae3 | 3826 | |
a5df8828 GL |
3827 | lseek_ret = lseek(fd, 0, SEEK_SET); |
3828 | if (lseek_ret < 0) { | |
7802bae3 | 3829 | PERROR("lseek"); |
a5df8828 | 3830 | ret = -1; |
7802bae3 LL |
3831 | goto end; |
3832 | } | |
3833 | ||
3834 | ret = ftruncate(fd, 0); | |
3835 | if (ret < 0) { | |
3836 | PERROR("ftruncate"); | |
3837 | goto end; | |
3838 | } | |
3839 | ||
3840 | end: | |
3841 | return ret; | |
3842 | } | |
3843 | ||
93ec662e | 3844 | static |
eded6438 | 3845 | int ust_regenerate_metadata(struct ltt_ust_session *usess) |
93ec662e JD |
3846 | { |
3847 | int ret = 0; | |
3848 | struct buffer_reg_uid *uid_reg = NULL; | |
3849 | struct buffer_reg_session *session_reg = NULL; | |
3850 | ||
3851 | rcu_read_lock(); | |
3852 | cds_list_for_each_entry(uid_reg, &usess->buffer_reg_uid_list, lnode) { | |
3853 | struct ust_registry_session *registry; | |
3854 | struct ust_registry_channel *chan; | |
3855 | struct lttng_ht_iter iter_chan; | |
3856 | ||
3857 | session_reg = uid_reg->registry; | |
3858 | registry = session_reg->reg.ust; | |
3859 | ||
3860 | pthread_mutex_lock(®istry->lock); | |
3861 | registry->metadata_len_sent = 0; | |
3862 | memset(registry->metadata, 0, registry->metadata_alloc_len); | |
3863 | registry->metadata_len = 0; | |
3864 | registry->metadata_version++; | |
7802bae3 LL |
3865 | if (registry->metadata_fd > 0) { |
3866 | /* Clear the metadata file's content. */ | |
3867 | ret = clear_metadata_file(registry->metadata_fd); | |
3868 | if (ret) { | |
3869 | pthread_mutex_unlock(®istry->lock); | |
3870 | goto end; | |
3871 | } | |
3872 | } | |
3873 | ||
93ec662e JD |
3874 | ret = ust_metadata_session_statedump(registry, NULL, |
3875 | registry->major, registry->minor); | |
3876 | if (ret) { | |
3877 | pthread_mutex_unlock(®istry->lock); | |
3878 | ERR("Failed to generate session metadata (err = %d)", | |
3879 | ret); | |
3880 | goto end; | |
3881 | } | |
3882 | cds_lfht_for_each_entry(registry->channels->ht, &iter_chan.iter, | |
3883 | chan, node.node) { | |
3884 | struct ust_registry_event *event; | |
3885 | struct lttng_ht_iter iter_event; | |
3886 | ||
3887 | ret = ust_metadata_channel_statedump(registry, chan); | |
3888 | if (ret) { | |
3889 | pthread_mutex_unlock(®istry->lock); | |
3890 | ERR("Failed to generate channel metadata " | |
3891 | "(err = %d)", ret); | |
3892 | goto end; | |
3893 | } | |
3894 | cds_lfht_for_each_entry(chan->ht->ht, &iter_event.iter, | |
3895 | event, node.node) { | |
3896 | ret = ust_metadata_event_statedump(registry, | |
3897 | chan, event); | |
3898 | if (ret) { | |
3899 | pthread_mutex_unlock(®istry->lock); | |
3900 | ERR("Failed to generate event metadata " | |
3901 | "(err = %d)", ret); | |
3902 | goto end; | |
3903 | } | |
3904 | } | |
3905 | } | |
3906 | pthread_mutex_unlock(®istry->lock); | |
3907 | } | |
3908 | ||
3909 | end: | |
3910 | rcu_read_unlock(); | |
3911 | return ret; | |
3912 | } | |
3913 | ||
3914 | /* | |
eded6438 | 3915 | * Command LTTNG_REGENERATE_METADATA from the lttng-ctl library. |
93ec662e JD |
3916 | * |
3917 | * Ask the consumer to truncate the existing metadata file(s) and | |
3918 | * then regenerate the metadata. Live and per-pid sessions are not | |
3919 | * supported and return an error. | |
3920 | * | |
3921 | * Return 0 on success or else a LTTNG_ERR code. | |
3922 | */ | |
eded6438 | 3923 | int cmd_regenerate_metadata(struct ltt_session *session) |
93ec662e JD |
3924 | { |
3925 | int ret; | |
3926 | ||
3927 | assert(session); | |
3928 | ||
eded6438 | 3929 | ret = check_regenerate_metadata_support(session); |
93ec662e JD |
3930 | if (ret) { |
3931 | goto end; | |
3932 | } | |
3933 | ||
3934 | if (session->kernel_session) { | |
eded6438 | 3935 | ret = kernctl_session_regenerate_metadata( |
93ec662e JD |
3936 | session->kernel_session->fd); |
3937 | if (ret < 0) { | |
3938 | ERR("Failed to regenerate the kernel metadata"); | |
3939 | goto end; | |
3940 | } | |
3941 | } | |
3942 | ||
3943 | if (session->ust_session) { | |
eded6438 | 3944 | ret = ust_regenerate_metadata(session->ust_session); |
93ec662e JD |
3945 | if (ret < 0) { |
3946 | ERR("Failed to regenerate the UST metadata"); | |
3947 | goto end; | |
3948 | } | |
3949 | } | |
3950 | DBG("Cmd metadata regenerate for session %s", session->name); | |
3951 | ret = LTTNG_OK; | |
3952 | ||
3953 | end: | |
3954 | return ret; | |
3955 | } | |
3956 | ||
c2561365 JD |
3957 | /* |
3958 | * Command LTTNG_REGENERATE_STATEDUMP from the lttng-ctl library. | |
3959 | * | |
3960 | * Ask the tracer to regenerate a new statedump. | |
3961 | * | |
3962 | * Return 0 on success or else a LTTNG_ERR code. | |
3963 | */ | |
3964 | int cmd_regenerate_statedump(struct ltt_session *session) | |
3965 | { | |
3966 | int ret; | |
3967 | ||
3968 | assert(session); | |
3969 | ||
3970 | if (!session->active) { | |
3971 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
3972 | goto end; | |
3973 | } | |
c2561365 JD |
3974 | |
3975 | if (session->kernel_session) { | |
3976 | ret = kernctl_session_regenerate_statedump( | |
3977 | session->kernel_session->fd); | |
3978 | /* | |
3979 | * Currently, the statedump in kernel can only fail if out | |
3980 | * of memory. | |
3981 | */ | |
3982 | if (ret < 0) { | |
3983 | if (ret == -ENOMEM) { | |
3984 | ret = LTTNG_ERR_REGEN_STATEDUMP_NOMEM; | |
3985 | } else { | |
3986 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
3987 | } | |
3988 | ERR("Failed to regenerate the kernel statedump"); | |
3989 | goto end; | |
3990 | } | |
3991 | } | |
3992 | ||
3993 | if (session->ust_session) { | |
3994 | ret = ust_app_regenerate_statedump_all(session->ust_session); | |
3995 | /* | |
3996 | * Currently, the statedump in UST always returns 0. | |
3997 | */ | |
3998 | if (ret < 0) { | |
3999 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
4000 | ERR("Failed to regenerate the UST statedump"); | |
4001 | goto end; | |
4002 | } | |
4003 | } | |
4004 | DBG("Cmd regenerate statedump for session %s", session->name); | |
4005 | ret = LTTNG_OK; | |
4006 | ||
4007 | end: | |
4008 | return ret; | |
4009 | } | |
4010 | ||
b0880ae5 JG |
4011 | int cmd_register_trigger(struct command_ctx *cmd_ctx, int sock, |
4012 | struct notification_thread_handle *notification_thread) | |
4013 | { | |
4014 | int ret; | |
4015 | size_t trigger_len; | |
4016 | ssize_t sock_recv_len; | |
4017 | struct lttng_trigger *trigger = NULL; | |
4018 | struct lttng_buffer_view view; | |
4019 | struct lttng_dynamic_buffer trigger_buffer; | |
4020 | ||
4021 | lttng_dynamic_buffer_init(&trigger_buffer); | |
4022 | trigger_len = (size_t) cmd_ctx->lsm->u.trigger.length; | |
4023 | ret = lttng_dynamic_buffer_set_size(&trigger_buffer, trigger_len); | |
4024 | if (ret) { | |
4025 | ret = LTTNG_ERR_NOMEM; | |
4026 | goto end; | |
4027 | } | |
4028 | ||
4029 | sock_recv_len = lttcomm_recv_unix_sock(sock, trigger_buffer.data, | |
4030 | trigger_len); | |
4031 | if (sock_recv_len < 0 || sock_recv_len != trigger_len) { | |
4032 | ERR("Failed to receive \"register trigger\" command payload"); | |
4033 | /* TODO: should this be a new error enum ? */ | |
4034 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
4035 | goto end; | |
4036 | } | |
4037 | ||
4038 | view = lttng_buffer_view_from_dynamic_buffer(&trigger_buffer, 0, -1); | |
4039 | if (lttng_trigger_create_from_buffer(&view, &trigger) != | |
4040 | trigger_len) { | |
4041 | ERR("Invalid trigger payload received in \"register trigger\" command"); | |
4042 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
4043 | goto end; | |
4044 | } | |
4045 | ||
4046 | ret = notification_thread_command_register_trigger(notification_thread, | |
4047 | trigger); | |
587f9fd0 JG |
4048 | /* Ownership of trigger was transferred. */ |
4049 | trigger = NULL; | |
b0880ae5 | 4050 | end: |
587f9fd0 | 4051 | lttng_trigger_destroy(trigger); |
b0880ae5 JG |
4052 | lttng_dynamic_buffer_reset(&trigger_buffer); |
4053 | return ret; | |
4054 | } | |
4055 | ||
4056 | int cmd_unregister_trigger(struct command_ctx *cmd_ctx, int sock, | |
4057 | struct notification_thread_handle *notification_thread) | |
4058 | { | |
4059 | int ret; | |
4060 | size_t trigger_len; | |
4061 | ssize_t sock_recv_len; | |
4062 | struct lttng_trigger *trigger = NULL; | |
4063 | struct lttng_buffer_view view; | |
4064 | struct lttng_dynamic_buffer trigger_buffer; | |
4065 | ||
4066 | lttng_dynamic_buffer_init(&trigger_buffer); | |
4067 | trigger_len = (size_t) cmd_ctx->lsm->u.trigger.length; | |
4068 | ret = lttng_dynamic_buffer_set_size(&trigger_buffer, trigger_len); | |
4069 | if (ret) { | |
4070 | ret = LTTNG_ERR_NOMEM; | |
4071 | goto end; | |
4072 | } | |
4073 | ||
4074 | sock_recv_len = lttcomm_recv_unix_sock(sock, trigger_buffer.data, | |
4075 | trigger_len); | |
4076 | if (sock_recv_len < 0 || sock_recv_len != trigger_len) { | |
4077 | ERR("Failed to receive \"unregister trigger\" command payload"); | |
4078 | /* TODO: should this be a new error enum ? */ | |
4079 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
4080 | goto end; | |
4081 | } | |
4082 | ||
4083 | view = lttng_buffer_view_from_dynamic_buffer(&trigger_buffer, 0, -1); | |
4084 | if (lttng_trigger_create_from_buffer(&view, &trigger) != | |
4085 | trigger_len) { | |
4086 | ERR("Invalid trigger payload received in \"unregister trigger\" command"); | |
4087 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
4088 | goto end; | |
4089 | } | |
4090 | ||
4091 | ret = notification_thread_command_unregister_trigger(notification_thread, | |
4092 | trigger); | |
4093 | end: | |
587f9fd0 | 4094 | lttng_trigger_destroy(trigger); |
b0880ae5 JG |
4095 | lttng_dynamic_buffer_reset(&trigger_buffer); |
4096 | return ret; | |
4097 | } | |
4098 | ||
6dc3064a DG |
4099 | /* |
4100 | * Send relayd sockets from snapshot output to consumer. Ignore request if the | |
4101 | * snapshot output is *not* set with a remote destination. | |
4102 | * | |
9a654598 | 4103 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a | 4104 | */ |
9a654598 JG |
4105 | static enum lttng_error_code set_relayd_for_snapshot( |
4106 | struct consumer_output *consumer, | |
fb9a95c4 JG |
4107 | const struct snapshot_output *snap_output, |
4108 | const struct ltt_session *session) | |
6dc3064a | 4109 | { |
9a654598 | 4110 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
4111 | struct lttng_ht_iter iter; |
4112 | struct consumer_socket *socket; | |
4113 | ||
4114 | assert(consumer); | |
4115 | assert(snap_output); | |
4116 | assert(session); | |
4117 | ||
4118 | DBG2("Set relayd object from snapshot output"); | |
4119 | ||
4120 | /* Ignore if snapshot consumer output is not network. */ | |
4121 | if (snap_output->consumer->type != CONSUMER_DST_NET) { | |
4122 | goto error; | |
4123 | } | |
4124 | ||
4125 | /* | |
4126 | * For each consumer socket, create and send the relayd object of the | |
4127 | * snapshot output. | |
4128 | */ | |
4129 | rcu_read_lock(); | |
5eecee74 DG |
4130 | cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter, |
4131 | socket, node.node) { | |
ecd0f96d | 4132 | pthread_mutex_lock(socket->lock); |
9a654598 | 4133 | status = send_consumer_relayd_sockets(0, session->id, |
d3e2ba59 JD |
4134 | snap_output->consumer, socket, |
4135 | session->name, session->hostname, | |
4136 | session->live_timer); | |
ecd0f96d | 4137 | pthread_mutex_unlock(socket->lock); |
9a654598 | 4138 | if (status != LTTNG_OK) { |
6dc3064a DG |
4139 | rcu_read_unlock(); |
4140 | goto error; | |
4141 | } | |
4142 | } | |
4143 | rcu_read_unlock(); | |
4144 | ||
4145 | error: | |
9a654598 | 4146 | return status; |
6dc3064a DG |
4147 | } |
4148 | ||
4149 | /* | |
4150 | * Record a kernel snapshot. | |
4151 | * | |
fac41e72 | 4152 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a | 4153 | */ |
fb9a95c4 JG |
4154 | static enum lttng_error_code record_kernel_snapshot( |
4155 | struct ltt_kernel_session *ksess, | |
4156 | const struct snapshot_output *output, | |
4157 | const struct ltt_session *session, | |
d07ceecd | 4158 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a DG |
4159 | { |
4160 | int ret; | |
9a654598 | 4161 | enum lttng_error_code status; |
6dc3064a DG |
4162 | |
4163 | assert(ksess); | |
4164 | assert(output); | |
4165 | assert(session); | |
4166 | ||
af706bb7 DG |
4167 | /* |
4168 | * Copy kernel session sockets so we can communicate with the right | |
4169 | * consumer for the snapshot record command. | |
4170 | */ | |
4171 | ret = consumer_copy_sockets(output->consumer, ksess->consumer); | |
4172 | if (ret < 0) { | |
9a654598 | 4173 | status = LTTNG_ERR_NOMEM; |
af706bb7 | 4174 | goto error; |
6dc3064a DG |
4175 | } |
4176 | ||
9a654598 JG |
4177 | status = set_relayd_for_snapshot(ksess->consumer, output, session); |
4178 | if (status != LTTNG_OK) { | |
af706bb7 | 4179 | goto error_snapshot; |
6dc3064a DG |
4180 | } |
4181 | ||
9a654598 JG |
4182 | status = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream); |
4183 | if (status != LTTNG_OK) { | |
af706bb7 | 4184 | goto error_snapshot; |
6dc3064a DG |
4185 | } |
4186 | ||
1371fc12 | 4187 | goto end; |
a934f4af | 4188 | |
af706bb7 DG |
4189 | error_snapshot: |
4190 | /* Clean up copied sockets so this output can use some other later on. */ | |
4191 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a | 4192 | error: |
1371fc12 | 4193 | end: |
9a654598 | 4194 | return status; |
6dc3064a DG |
4195 | } |
4196 | ||
4197 | /* | |
4198 | * Record a UST snapshot. | |
4199 | * | |
9a654598 | 4200 | * Returns LTTNG_OK on success or a LTTNG_ERR error code. |
6dc3064a | 4201 | */ |
9a654598 | 4202 | static enum lttng_error_code record_ust_snapshot(struct ltt_ust_session *usess, |
fb9a95c4 JG |
4203 | const struct snapshot_output *output, |
4204 | const struct ltt_session *session, int wait, | |
4205 | uint64_t nb_packets_per_stream) | |
6dc3064a DG |
4206 | { |
4207 | int ret; | |
9a654598 | 4208 | enum lttng_error_code status; |
6dc3064a DG |
4209 | |
4210 | assert(usess); | |
4211 | assert(output); | |
4212 | assert(session); | |
4213 | ||
af706bb7 | 4214 | /* |
d3f14b8a | 4215 | * Copy UST session sockets so we can communicate with the right |
af706bb7 DG |
4216 | * consumer for the snapshot record command. |
4217 | */ | |
4218 | ret = consumer_copy_sockets(output->consumer, usess->consumer); | |
4219 | if (ret < 0) { | |
9a654598 | 4220 | status = LTTNG_ERR_NOMEM; |
af706bb7 | 4221 | goto error; |
6dc3064a DG |
4222 | } |
4223 | ||
9a654598 JG |
4224 | status = set_relayd_for_snapshot(usess->consumer, output, session); |
4225 | if (status != LTTNG_OK) { | |
af706bb7 | 4226 | goto error_snapshot; |
6dc3064a DG |
4227 | } |
4228 | ||
fb9a95c4 JG |
4229 | status = ust_app_snapshot_record(usess, output, wait, |
4230 | nb_packets_per_stream); | |
9a654598 | 4231 | if (status != LTTNG_OK) { |
af706bb7 | 4232 | goto error_snapshot; |
6dc3064a DG |
4233 | } |
4234 | ||
c4a29317 JR |
4235 | goto end; |
4236 | ||
af706bb7 DG |
4237 | error_snapshot: |
4238 | /* Clean up copied sockets so this output can use some other later on. */ | |
4239 | consumer_destroy_output_sockets(output->consumer); | |
6dc3064a | 4240 | error: |
c4a29317 | 4241 | end: |
9a654598 | 4242 | return status; |
6dc3064a DG |
4243 | } |
4244 | ||
d07ceecd | 4245 | static |
fb9a95c4 JG |
4246 | uint64_t get_session_size_one_more_packet_per_stream( |
4247 | const struct ltt_session *session, uint64_t cur_nr_packets) | |
68808f4e | 4248 | { |
d07ceecd | 4249 | uint64_t tot_size = 0; |
68808f4e DG |
4250 | |
4251 | if (session->kernel_session) { | |
4252 | struct ltt_kernel_channel *chan; | |
fb9a95c4 JG |
4253 | const struct ltt_kernel_session *ksess = |
4254 | session->kernel_session; | |
68808f4e | 4255 | |
68808f4e | 4256 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
d07ceecd MD |
4257 | if (cur_nr_packets >= chan->channel->attr.num_subbuf) { |
4258 | /* | |
4259 | * Don't take channel into account if we | |
4260 | * already grab all its packets. | |
4261 | */ | |
4262 | continue; | |
68808f4e | 4263 | } |
d07ceecd MD |
4264 | tot_size += chan->channel->attr.subbuf_size |
4265 | * chan->stream_count; | |
68808f4e DG |
4266 | } |
4267 | } | |
4268 | ||
4269 | if (session->ust_session) { | |
fb9a95c4 | 4270 | const struct ltt_ust_session *usess = session->ust_session; |
68808f4e | 4271 | |
d07ceecd MD |
4272 | tot_size += ust_app_get_size_one_more_packet_per_stream(usess, |
4273 | cur_nr_packets); | |
68808f4e DG |
4274 | } |
4275 | ||
d07ceecd | 4276 | return tot_size; |
68808f4e DG |
4277 | } |
4278 | ||
5c786ded | 4279 | /* |
d07ceecd MD |
4280 | * Calculate the number of packets we can grab from each stream that |
4281 | * fits within the overall snapshot max size. | |
4282 | * | |
4283 | * Returns -1 on error, 0 means infinite number of packets, else > 0 is | |
4284 | * the number of packets per stream. | |
4285 | * | |
4286 | * TODO: this approach is not perfect: we consider the worse case | |
4287 | * (packet filling the sub-buffers) as an upper bound, but we could do | |
4288 | * better if we do this calculation while we actually grab the packet | |
4289 | * content: we would know how much padding we don't actually store into | |
4290 | * the file. | |
4291 | * | |
4292 | * This algorithm is currently bounded by the number of packets per | |
4293 | * stream. | |
4294 | * | |
4295 | * Since we call this algorithm before actually grabbing the data, it's | |
4296 | * an approximation: for instance, applications could appear/disappear | |
4297 | * in between this call and actually grabbing data. | |
5c786ded | 4298 | */ |
d07ceecd | 4299 | static |
fb9a95c4 JG |
4300 | int64_t get_session_nb_packets_per_stream(const struct ltt_session *session, |
4301 | uint64_t max_size) | |
5c786ded | 4302 | { |
d07ceecd MD |
4303 | int64_t size_left; |
4304 | uint64_t cur_nb_packets = 0; | |
5c786ded | 4305 | |
d07ceecd MD |
4306 | if (!max_size) { |
4307 | return 0; /* Infinite */ | |
5c786ded JD |
4308 | } |
4309 | ||
d07ceecd MD |
4310 | size_left = max_size; |
4311 | for (;;) { | |
4312 | uint64_t one_more_packet_tot_size; | |
5c786ded | 4313 | |
fb9a95c4 JG |
4314 | one_more_packet_tot_size = get_session_size_one_more_packet_per_stream( |
4315 | session, cur_nb_packets); | |
d07ceecd MD |
4316 | if (!one_more_packet_tot_size) { |
4317 | /* We are already grabbing all packets. */ | |
4318 | break; | |
4319 | } | |
4320 | size_left -= one_more_packet_tot_size; | |
4321 | if (size_left < 0) { | |
4322 | break; | |
4323 | } | |
4324 | cur_nb_packets++; | |
5c786ded | 4325 | } |
d07ceecd MD |
4326 | if (!cur_nb_packets) { |
4327 | /* Not enough room to grab one packet of each stream, error. */ | |
4328 | return -1; | |
4329 | } | |
4330 | return cur_nb_packets; | |
5c786ded JD |
4331 | } |
4332 | ||
fb9a95c4 JG |
4333 | static |
4334 | enum lttng_error_code snapshot_record(const struct ltt_session *session, | |
4335 | const struct snapshot_output *snapshot_output, int wait) | |
4336 | { | |
4337 | int64_t nb_packets_per_stream; | |
4338 | enum lttng_error_code ret = LTTNG_OK; | |
4339 | ||
4340 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
4341 | snapshot_output->max_size); | |
4342 | if (nb_packets_per_stream < 0) { | |
4343 | ret = LTTNG_ERR_MAX_SIZE_INVALID; | |
4344 | goto end; | |
4345 | } | |
4346 | ||
4347 | if (session->kernel_session) { | |
4348 | ret = record_kernel_snapshot(session->kernel_session, | |
4349 | snapshot_output, session, | |
4350 | wait, nb_packets_per_stream); | |
4351 | if (ret != LTTNG_OK) { | |
4352 | goto end; | |
4353 | } | |
4354 | } | |
4355 | ||
4356 | if (session->ust_session) { | |
4357 | ret = record_ust_snapshot(session->ust_session, | |
4358 | snapshot_output, session, | |
4359 | wait, nb_packets_per_stream); | |
4360 | if (ret != LTTNG_OK) { | |
4361 | goto end; | |
4362 | } | |
4363 | } | |
4364 | end: | |
4365 | return ret; | |
4366 | } | |
4367 | ||
6dc3064a DG |
4368 | /* |
4369 | * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl. | |
4370 | * | |
4371 | * The wait parameter is ignored so this call always wait for the snapshot to | |
4372 | * complete before returning. | |
4373 | * | |
4374 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
4375 | */ | |
4376 | int cmd_snapshot_record(struct ltt_session *session, | |
4377 | struct lttng_snapshot_output *output, int wait) | |
4378 | { | |
9a654598 JG |
4379 | enum lttng_error_code cmd_ret = LTTNG_OK; |
4380 | int ret; | |
e1986656 DG |
4381 | unsigned int use_tmp_output = 0; |
4382 | struct snapshot_output tmp_output; | |
00e1dfc4 | 4383 | unsigned int snapshot_success = 0; |
10ba83fe | 4384 | char datetime[16]; |
6dc3064a DG |
4385 | |
4386 | assert(session); | |
ba45d9f0 | 4387 | assert(output); |
6dc3064a DG |
4388 | |
4389 | DBG("Cmd snapshot record for session %s", session->name); | |
4390 | ||
10ba83fe JR |
4391 | /* Get the datetime for the snapshot output directory. */ |
4392 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", datetime, | |
4393 | sizeof(datetime)); | |
4394 | if (!ret) { | |
9a654598 | 4395 | cmd_ret = LTTNG_ERR_INVALID; |
10ba83fe JR |
4396 | goto error; |
4397 | } | |
4398 | ||
6dc3064a | 4399 | /* |
d3f14b8a MD |
4400 | * Permission denied to create an output if the session is not |
4401 | * set in no output mode. | |
6dc3064a DG |
4402 | */ |
4403 | if (session->output_traces) { | |
9a654598 | 4404 | cmd_ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
4405 | goto error; |
4406 | } | |
4407 | ||
4408 | /* The session needs to be started at least once. */ | |
8382cf6f | 4409 | if (!session->has_been_started) { |
9a654598 | 4410 | cmd_ret = LTTNG_ERR_START_SESSION_ONCE; |
6dc3064a DG |
4411 | goto error; |
4412 | } | |
4413 | ||
4414 | /* Use temporary output for the session. */ | |
ba45d9f0 | 4415 | if (*output->ctrl_url != '\0') { |
b178f53e JG |
4416 | ret = snapshot_output_init(session, output->max_size, |
4417 | output->name, | |
4418 | output->ctrl_url, output->data_url, | |
4419 | session->consumer, | |
e1986656 | 4420 | &tmp_output, NULL); |
6dc3064a DG |
4421 | if (ret < 0) { |
4422 | if (ret == -ENOMEM) { | |
9a654598 | 4423 | cmd_ret = LTTNG_ERR_NOMEM; |
6dc3064a | 4424 | } else { |
9a654598 | 4425 | cmd_ret = LTTNG_ERR_INVALID; |
6dc3064a DG |
4426 | } |
4427 | goto error; | |
4428 | } | |
1bfe7328 DG |
4429 | /* Use the global session count for the temporary snapshot. */ |
4430 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; | |
10ba83fe JR |
4431 | |
4432 | /* Use the global datetime */ | |
4433 | memcpy(tmp_output.datetime, datetime, sizeof(datetime)); | |
e1986656 | 4434 | use_tmp_output = 1; |
6dc3064a DG |
4435 | } |
4436 | ||
804c90a8 | 4437 | if (use_tmp_output) { |
fb9a95c4 JG |
4438 | cmd_ret = snapshot_record(session, &tmp_output, wait); |
4439 | if (cmd_ret != LTTNG_OK) { | |
804c90a8 JR |
4440 | goto error; |
4441 | } | |
804c90a8 JR |
4442 | snapshot_success = 1; |
4443 | } else { | |
4444 | struct snapshot_output *sout; | |
4445 | struct lttng_ht_iter iter; | |
68808f4e | 4446 | |
804c90a8 JR |
4447 | rcu_read_lock(); |
4448 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
4449 | &iter.iter, sout, node.node) { | |
804c90a8 | 4450 | /* |
fb9a95c4 JG |
4451 | * Make a local copy of the output and assign the |
4452 | * possible temporary value given by the caller. | |
804c90a8 | 4453 | */ |
804c90a8 | 4454 | memcpy(&tmp_output, sout, sizeof(tmp_output)); |
1bfe7328 | 4455 | |
804c90a8 JR |
4456 | if (output->max_size != (uint64_t) -1ULL) { |
4457 | tmp_output.max_size = output->max_size; | |
6dc3064a | 4458 | } |
d07ceecd | 4459 | |
fb9a95c4 JG |
4460 | tmp_output.nb_snapshot = session->snapshot.nb_snapshot; |
4461 | memcpy(tmp_output.datetime, datetime, sizeof(datetime)); | |
6dc3064a | 4462 | |
804c90a8 JR |
4463 | /* Use temporary name. */ |
4464 | if (*output->name != '\0') { | |
cf3e357d MD |
4465 | if (lttng_strncpy(tmp_output.name, output->name, |
4466 | sizeof(tmp_output.name))) { | |
9a654598 | 4467 | cmd_ret = LTTNG_ERR_INVALID; |
cf3e357d MD |
4468 | rcu_read_unlock(); |
4469 | goto error; | |
4470 | } | |
804c90a8 | 4471 | } |
e1986656 | 4472 | |
fb9a95c4 JG |
4473 | cmd_ret = snapshot_record(session, &tmp_output, wait); |
4474 | if (cmd_ret != LTTNG_OK) { | |
4475 | rcu_read_unlock(); | |
4476 | goto error; | |
6dc3064a | 4477 | } |
804c90a8 | 4478 | snapshot_success = 1; |
6dc3064a | 4479 | } |
804c90a8 | 4480 | rcu_read_unlock(); |
6dc3064a DG |
4481 | } |
4482 | ||
1bfe7328 DG |
4483 | if (snapshot_success) { |
4484 | session->snapshot.nb_snapshot++; | |
b67578cb | 4485 | } else { |
9a654598 | 4486 | cmd_ret = LTTNG_ERR_SNAPSHOT_FAIL; |
1bfe7328 DG |
4487 | } |
4488 | ||
6dc3064a | 4489 | error: |
9a654598 | 4490 | return cmd_ret; |
6dc3064a DG |
4491 | } |
4492 | ||
d7ba1388 MD |
4493 | /* |
4494 | * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread. | |
4495 | */ | |
4496 | int cmd_set_session_shm_path(struct ltt_session *session, | |
4497 | const char *shm_path) | |
4498 | { | |
4499 | /* Safety net */ | |
4500 | assert(session); | |
4501 | ||
4502 | /* | |
4503 | * Can only set shm path before session is started. | |
4504 | */ | |
4505 | if (session->has_been_started) { | |
4506 | return LTTNG_ERR_SESSION_STARTED; | |
4507 | } | |
4508 | ||
4509 | strncpy(session->shm_path, shm_path, | |
4510 | sizeof(session->shm_path)); | |
4511 | session->shm_path[sizeof(session->shm_path) - 1] = '\0'; | |
4512 | ||
4513 | return 0; | |
4514 | } | |
4515 | ||
5c408ad8 JD |
4516 | /* |
4517 | * Command LTTNG_ROTATE_SESSION from the lttng-ctl library. | |
4518 | * | |
4519 | * Ask the consumer to rotate the session output directory. | |
4520 | * The session lock must be held. | |
4521 | * | |
d5a1b7aa | 4522 | * Returns LTTNG_OK on success or else a negative LTTng error code. |
5c408ad8 JD |
4523 | */ |
4524 | int cmd_rotate_session(struct ltt_session *session, | |
4525 | struct lttng_rotate_session_return *rotate_return) | |
4526 | { | |
4527 | int ret; | |
d5a1b7aa | 4528 | enum lttng_error_code cmd_ret = LTTNG_OK; |
5c408ad8 JD |
4529 | size_t strf_ret; |
4530 | struct tm *timeinfo; | |
fc58be13 | 4531 | char datetime[21]; |
5c408ad8 | 4532 | time_t now; |
2961f09e JG |
4533 | /* |
4534 | * Used to roll-back timestamps in case of failure to launch the | |
4535 | * rotation. | |
4536 | */ | |
4537 | time_t original_last_chunk_start_ts, original_current_chunk_start_ts; | |
5c408ad8 JD |
4538 | |
4539 | assert(session); | |
4540 | ||
4541 | if (!session->has_been_started) { | |
d5a1b7aa | 4542 | cmd_ret = LTTNG_ERR_START_SESSION_ONCE; |
d68c9a04 | 4543 | goto end; |
5c408ad8 JD |
4544 | } |
4545 | ||
92fe5ca1 | 4546 | if (session->live_timer || !session->output_traces) { |
d5a1b7aa | 4547 | cmd_ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE; |
d68c9a04 | 4548 | goto end; |
5c408ad8 JD |
4549 | } |
4550 | ||
4551 | /* | |
4552 | * Unsupported feature in lttng-relayd before 2.11. | |
4553 | */ | |
4554 | if (session->consumer->type == CONSUMER_DST_NET && | |
4555 | (session->consumer->relay_major_version == 2 && | |
4556 | session->consumer->relay_minor_version < 11)) { | |
d5a1b7aa | 4557 | cmd_ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE_RELAY; |
d68c9a04 | 4558 | goto end; |
5c408ad8 JD |
4559 | } |
4560 | ||
92816cc3 | 4561 | if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) { |
92816cc3 JG |
4562 | DBG("Refusing to launch a rotation; a rotation is already in progress for session %s", |
4563 | session->name); | |
d5a1b7aa | 4564 | cmd_ret = LTTNG_ERR_ROTATION_PENDING; |
d68c9a04 | 4565 | goto end; |
5c408ad8 JD |
4566 | } |
4567 | ||
4568 | /* | |
4569 | * After a stop, we only allow one rotation to occur, the other ones are | |
4570 | * useless until a new start. | |
4571 | */ | |
4572 | if (session->rotated_after_last_stop) { | |
4573 | DBG("Session \"%s\" was already rotated after stop, refusing rotation", | |
4574 | session->name); | |
d5a1b7aa | 4575 | cmd_ret = LTTNG_ERR_ROTATION_MULTIPLE_AFTER_STOP; |
d68c9a04 | 4576 | goto end; |
5c408ad8 JD |
4577 | } |
4578 | ||
4579 | /* Special case for the first rotation. */ | |
ad9f5c17 | 4580 | if (session->current_archive_id == 0) { |
5c408ad8 JD |
4581 | const char *base_path = NULL; |
4582 | ||
92816cc3 | 4583 | assert(session->kernel_session || session->ust_session); |
5c408ad8 | 4584 | /* Either one of the two sessions is enough to get the root path. */ |
92816cc3 | 4585 | base_path = session_get_base_path(session); |
5c408ad8 | 4586 | assert(base_path); |
92816cc3 | 4587 | |
5c408ad8 JD |
4588 | ret = lttng_strncpy(session->rotation_chunk.current_rotate_path, |
4589 | base_path, | |
4590 | sizeof(session->rotation_chunk.current_rotate_path)); | |
4591 | if (ret) { | |
4592 | ERR("Failed to copy session base path to current rotation chunk path"); | |
d5a1b7aa | 4593 | cmd_ret = LTTNG_ERR_UNK; |
d68c9a04 | 4594 | goto end; |
5c408ad8 JD |
4595 | } |
4596 | } else { | |
4597 | /* | |
4598 | * The currently active tracing path is now the folder we | |
4599 | * want to rotate. | |
4600 | */ | |
4601 | ret = lttng_strncpy(session->rotation_chunk.current_rotate_path, | |
4602 | session->rotation_chunk.active_tracing_path, | |
4603 | sizeof(session->rotation_chunk.current_rotate_path)); | |
4604 | if (ret) { | |
4605 | ERR("Failed to copy the active tracing path to the current rotate path"); | |
d5a1b7aa | 4606 | cmd_ret = LTTNG_ERR_UNK; |
d68c9a04 | 4607 | goto end; |
5c408ad8 JD |
4608 | } |
4609 | } | |
4610 | DBG("Current rotate path %s", session->rotation_chunk.current_rotate_path); | |
4611 | ||
92816cc3 JG |
4612 | /* |
4613 | * Channels created after this point will belong to the next | |
4614 | * archive id. | |
4615 | */ | |
ad9f5c17 | 4616 | session->current_archive_id++; |
5c408ad8 | 4617 | |
5c408ad8 JD |
4618 | now = time(NULL); |
4619 | if (now == (time_t) -1) { | |
938255db | 4620 | cmd_ret = LTTNG_ERR_UNK; |
d68c9a04 | 4621 | goto end; |
5c408ad8 | 4622 | } |
2961f09e JG |
4623 | |
4624 | /* Sample chunk bounds for roll-back in case of error. */ | |
4625 | original_last_chunk_start_ts = session->last_chunk_start_ts; | |
4626 | original_current_chunk_start_ts = session->current_chunk_start_ts; | |
4627 | ||
5c408ad8 JD |
4628 | session->last_chunk_start_ts = session->current_chunk_start_ts; |
4629 | session->current_chunk_start_ts = now; | |
4630 | ||
4631 | timeinfo = localtime(&now); | |
4632 | if (!timeinfo) { | |
4633 | PERROR("Failed to sample local time in rotate session command"); | |
d5a1b7aa | 4634 | cmd_ret = LTTNG_ERR_UNK; |
d68c9a04 | 4635 | goto end; |
5c408ad8 | 4636 | } |
fc58be13 | 4637 | strf_ret = strftime(datetime, sizeof(datetime), "%Y%m%dT%H%M%S%z", |
5c408ad8 JD |
4638 | timeinfo); |
4639 | if (!strf_ret) { | |
4640 | ERR("Failed to format local time timestamp in rotate session command"); | |
d5a1b7aa | 4641 | cmd_ret = LTTNG_ERR_UNK; |
d68c9a04 | 4642 | goto end; |
5c408ad8 | 4643 | } |
2961f09e | 4644 | |
b178f53e JG |
4645 | /* Current chunk directory, ex: 20170922-111754-42 */ |
4646 | ret = snprintf(session->consumer->chunk_path, | |
4647 | sizeof(session->consumer->chunk_path), | |
4648 | "%s-%" PRIu64, datetime, | |
4649 | session->current_archive_id + 1); | |
4650 | if (ret < 0 || ret >= sizeof(session->consumer->chunk_path)) { | |
4651 | ERR("Failed to format the new chunk's directory in rotate session command"); | |
4652 | cmd_ret = LTTNG_ERR_UNK; | |
4653 | goto error; | |
4654 | } | |
4655 | ||
4656 | /* | |
4657 | * The active path for the next rotation/destroy. | |
4658 | * Ex: ~/lttng-traces/auto-20170922-111748/20170922-111754-42 | |
4659 | */ | |
4660 | ret = snprintf(session->rotation_chunk.active_tracing_path, | |
4661 | sizeof(session->rotation_chunk.active_tracing_path), | |
4662 | "%s/%s", | |
4663 | session_get_base_path(session), | |
4664 | session->consumer->chunk_path); | |
4665 | if (ret < 0 || ret >= sizeof(session->rotation_chunk.active_tracing_path)) { | |
4666 | ERR("Failed to format active tracing path in rotate session command"); | |
4667 | cmd_ret = LTTNG_ERR_UNK; | |
4668 | goto error; | |
4669 | } | |
4670 | ||
2961f09e JG |
4671 | /* |
4672 | * A rotation has a local step even if the destination is a relay | |
4673 | * daemon; the buffers must be consumed by the consumer daemon. | |
4674 | */ | |
4675 | session->rotation_pending_local = true; | |
4676 | session->rotation_pending_relay = | |
4677 | session_get_consumer_destination_type(session) == CONSUMER_DST_NET; | |
4678 | session->rotation_state = LTTNG_ROTATION_STATE_ONGOING; | |
4679 | ||
5c408ad8 | 4680 | if (session->kernel_session) { |
b178f53e JG |
4681 | ret = lttng_strncpy( |
4682 | session->kernel_session->consumer->chunk_path, | |
4683 | session->consumer->chunk_path, | |
4684 | sizeof(session->kernel_session->consumer->chunk_path)); | |
4685 | if (ret) { | |
4686 | ERR("Failed to copy current chunk directory to kernel session"); | |
d5a1b7aa | 4687 | cmd_ret = LTTNG_ERR_UNK; |
2961f09e | 4688 | goto error; |
5c408ad8 JD |
4689 | } |
4690 | /* | |
b178f53e JG |
4691 | * Create the new chunk folder, before the rotation begins so we |
4692 | * don't race with the consumer/tracer activity. | |
5c408ad8 JD |
4693 | */ |
4694 | ret = domain_mkdir(session->kernel_session->consumer, session, | |
4695 | session->kernel_session->uid, | |
4696 | session->kernel_session->gid); | |
4697 | if (ret) { | |
d5a1b7aa | 4698 | cmd_ret = LTTNG_ERR_CREATE_DIR_FAIL; |
2961f09e | 4699 | goto error; |
5c408ad8 | 4700 | } |
d5a1b7aa JG |
4701 | cmd_ret = kernel_rotate_session(session); |
4702 | if (cmd_ret != LTTNG_OK) { | |
2961f09e | 4703 | goto error; |
5c408ad8 JD |
4704 | } |
4705 | } | |
4706 | if (session->ust_session) { | |
b178f53e JG |
4707 | ret = lttng_strncpy( |
4708 | session->ust_session->consumer->chunk_path, | |
4709 | session->consumer->chunk_path, | |
4710 | sizeof(session->ust_session->consumer->chunk_path)); | |
4711 | if (ret) { | |
4712 | ERR("Failed to copy current chunk directory to userspace session"); | |
d5a1b7aa | 4713 | cmd_ret = LTTNG_ERR_UNK; |
2961f09e | 4714 | goto error; |
5c408ad8 | 4715 | } |
5c408ad8 JD |
4716 | ret = domain_mkdir(session->ust_session->consumer, session, |
4717 | session->ust_session->uid, | |
4718 | session->ust_session->gid); | |
b019620d | 4719 | if (ret) { |
d5a1b7aa | 4720 | cmd_ret = LTTNG_ERR_CREATE_DIR_FAIL; |
2961f09e | 4721 | goto error; |
b019620d | 4722 | } |
d5a1b7aa JG |
4723 | cmd_ret = ust_app_rotate_session(session); |
4724 | if (cmd_ret != LTTNG_OK) { | |
2961f09e | 4725 | goto error; |
5c408ad8 | 4726 | } |
92816cc3 | 4727 | } |
17dd1232 | 4728 | |
92816cc3 JG |
4729 | ret = timer_session_rotation_pending_check_start(session, |
4730 | DEFAULT_ROTATE_PENDING_TIMER); | |
4731 | if (ret) { | |
d5a1b7aa | 4732 | cmd_ret = LTTNG_ERR_UNK; |
2961f09e | 4733 | goto error; |
5c408ad8 JD |
4734 | } |
4735 | ||
4736 | if (!session->active) { | |
4737 | session->rotated_after_last_stop = true; | |
4738 | } | |
4739 | ||
4740 | if (rotate_return) { | |
ad9f5c17 | 4741 | rotate_return->rotation_id = session->current_archive_id; |
5c408ad8 JD |
4742 | } |
4743 | ||
2961f09e JG |
4744 | ret = notification_thread_command_session_rotation_ongoing( |
4745 | notification_thread_handle, | |
4746 | session->name, session->uid, session->gid, | |
4747 | session->current_archive_id - 1); | |
4748 | if (ret != LTTNG_OK) { | |
4749 | ERR("Failed to notify notification thread that a session rotation is ongoing for session %s", | |
4750 | session->name); | |
d5a1b7aa | 4751 | cmd_ret = ret; |
2961f09e JG |
4752 | } |
4753 | ||
92816cc3 JG |
4754 | DBG("Cmd rotate session %s, archive_id %" PRIu64 " sent", |
4755 | session->name, session->current_archive_id - 1); | |
5c408ad8 | 4756 | end: |
d5a1b7aa | 4757 | ret = (cmd_ret == LTTNG_OK) ? cmd_ret : -((int) cmd_ret); |
5c408ad8 | 4758 | return ret; |
2961f09e JG |
4759 | error: |
4760 | session->last_chunk_start_ts = original_last_chunk_start_ts; | |
4761 | session->current_archive_id = original_current_chunk_start_ts; | |
4762 | if (session_reset_rotation_state(session, | |
4763 | LTTNG_ROTATION_STATE_NO_ROTATION)) { | |
4764 | ERR("Failed to reset rotation state of session \"%s\"", | |
4765 | session->name); | |
4766 | } | |
4767 | goto end; | |
5c408ad8 JD |
4768 | } |
4769 | ||
4770 | /* | |
d68c9a04 | 4771 | * Command LTTNG_ROTATION_GET_INFO from the lttng-ctl library. |
5c408ad8 JD |
4772 | * |
4773 | * Check if the session has finished its rotation. | |
4774 | * | |
4775 | * Return 0 on success or else a LTTNG_ERR code. | |
4776 | */ | |
d68c9a04 JD |
4777 | int cmd_rotate_get_info(struct ltt_session *session, |
4778 | struct lttng_rotation_get_info_return *info_return, | |
4779 | uint64_t rotation_id) | |
5c408ad8 JD |
4780 | { |
4781 | int ret; | |
4782 | ||
4783 | assert(session); | |
4784 | ||
d68c9a04 | 4785 | DBG("Cmd rotate_get_info session %s, rotation id %" PRIu64, session->name, |
ad9f5c17 | 4786 | session->current_archive_id); |
5c408ad8 | 4787 | |
ad9f5c17 | 4788 | if (session->current_archive_id != rotation_id) { |
d68c9a04 | 4789 | info_return->status = (int32_t) LTTNG_ROTATION_STATE_EXPIRED; |
5c408ad8 JD |
4790 | ret = LTTNG_OK; |
4791 | goto end; | |
4792 | } | |
4793 | ||
d68c9a04 JD |
4794 | switch (session->rotation_state) { |
4795 | case LTTNG_ROTATION_STATE_ONGOING: | |
4796 | DBG("Reporting that rotation id %" PRIu64 " of session %s is still pending", | |
4797 | rotation_id, session->name); | |
4798 | break; | |
4799 | case LTTNG_ROTATION_STATE_COMPLETED: | |
dd73d57b JG |
4800 | { |
4801 | char *current_tracing_path_reply; | |
4802 | size_t current_tracing_path_reply_len; | |
4803 | ||
4804 | switch (session_get_consumer_destination_type(session)) { | |
4805 | case CONSUMER_DST_LOCAL: | |
4806 | current_tracing_path_reply = | |
4807 | info_return->location.local.absolute_path; | |
4808 | current_tracing_path_reply_len = | |
4809 | sizeof(info_return->location.local.absolute_path); | |
4810 | info_return->location_type = | |
05f8afa9 | 4811 | (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_LOCAL; |
dd73d57b JG |
4812 | break; |
4813 | case CONSUMER_DST_NET: | |
4814 | current_tracing_path_reply = | |
4815 | info_return->location.relay.relative_path; | |
4816 | current_tracing_path_reply_len = | |
4817 | sizeof(info_return->location.relay.relative_path); | |
4818 | /* Currently the only supported relay protocol. */ | |
4819 | info_return->location.relay.protocol = | |
05f8afa9 | 4820 | (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_RELAY_PROTOCOL_TYPE_TCP; |
dd73d57b JG |
4821 | |
4822 | ret = lttng_strncpy(info_return->location.relay.host, | |
4823 | session_get_net_consumer_hostname(session), | |
4824 | sizeof(info_return->location.relay.host)); | |
4825 | if (ret) { | |
4826 | ERR("Failed to host name to rotate_get_info reply"); | |
4827 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; | |
4828 | ret = -LTTNG_ERR_UNK; | |
4829 | goto end; | |
4830 | } | |
4831 | ||
4832 | session_get_net_consumer_ports(session, | |
4833 | &info_return->location.relay.ports.control, | |
4834 | &info_return->location.relay.ports.data); | |
4835 | info_return->location_type = | |
05f8afa9 | 4836 | (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_RELAY; |
dd73d57b JG |
4837 | break; |
4838 | default: | |
4839 | abort(); | |
4840 | } | |
4841 | ret = lttng_strncpy(current_tracing_path_reply, | |
5c408ad8 | 4842 | session->rotation_chunk.current_rotate_path, |
dd73d57b | 4843 | current_tracing_path_reply_len); |
5c408ad8 | 4844 | if (ret) { |
dd73d57b | 4845 | ERR("Failed to copy current tracing path to rotate_get_info reply"); |
d68c9a04 JD |
4846 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; |
4847 | ret = -LTTNG_ERR_UNK; | |
5c408ad8 JD |
4848 | goto end; |
4849 | } | |
dd73d57b | 4850 | |
d68c9a04 | 4851 | break; |
dd73d57b | 4852 | } |
d68c9a04 JD |
4853 | case LTTNG_ROTATION_STATE_ERROR: |
4854 | DBG("Reporting that an error occurred during rotation %" PRIu64 " of session %s", | |
4855 | rotation_id, session->name); | |
4856 | break; | |
4857 | default: | |
4858 | abort(); | |
5c408ad8 JD |
4859 | } |
4860 | ||
d68c9a04 | 4861 | info_return->status = (int32_t) session->rotation_state; |
5c408ad8 | 4862 | ret = LTTNG_OK; |
5c408ad8 JD |
4863 | end: |
4864 | return ret; | |
4865 | } | |
4866 | ||
259c2674 JD |
4867 | /* |
4868 | * Command LTTNG_ROTATION_SET_SCHEDULE from the lttng-ctl library. | |
4869 | * | |
4870 | * Configure the automatic rotation parameters. | |
66ea93b1 JG |
4871 | * 'activate' to true means activate the rotation schedule type with 'new_value'. |
4872 | * 'activate' to false means deactivate the rotation schedule and validate that | |
4873 | * 'new_value' has the same value as the currently active value. | |
259c2674 | 4874 | * |
66ea93b1 | 4875 | * Return 0 on success or else a positive LTTNG_ERR code. |
259c2674 JD |
4876 | */ |
4877 | int cmd_rotation_set_schedule(struct ltt_session *session, | |
66ea93b1 JG |
4878 | bool activate, enum lttng_rotation_schedule_type schedule_type, |
4879 | uint64_t new_value, | |
90936dcf | 4880 | struct notification_thread_handle *notification_thread_handle) |
259c2674 JD |
4881 | { |
4882 | int ret; | |
66ea93b1 | 4883 | uint64_t *parameter_value; |
259c2674 JD |
4884 | |
4885 | assert(session); | |
4886 | ||
4887 | DBG("Cmd rotate set schedule session %s", session->name); | |
4888 | ||
92fe5ca1 | 4889 | if (session->live_timer || !session->output_traces) { |
66ea93b1 | 4890 | DBG("Failing ROTATION_SET_SCHEDULE command as the rotation feature is not available for this session"); |
259c2674 JD |
4891 | ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE; |
4892 | goto end; | |
4893 | } | |
4894 | ||
66ea93b1 JG |
4895 | switch (schedule_type) { |
4896 | case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD: | |
4897 | parameter_value = &session->rotate_size; | |
4898 | break; | |
4899 | case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC: | |
4900 | parameter_value = &session->rotate_timer_period; | |
4901 | if (new_value >= UINT_MAX) { | |
4902 | DBG("Failing ROTATION_SET_SCHEDULE command as the value requested for a periodic rotation schedule is invalid: %" PRIu64 " > %u (UINT_MAX)", | |
4903 | new_value, UINT_MAX); | |
4904 | ret = LTTNG_ERR_INVALID; | |
4905 | goto end; | |
4906 | } | |
4907 | break; | |
4908 | default: | |
4909 | WARN("Failing ROTATION_SET_SCHEDULE command on unknown schedule type"); | |
4910 | ret = LTTNG_ERR_INVALID; | |
259c2674 | 4911 | goto end; |
66ea93b1 JG |
4912 | } |
4913 | ||
4914 | /* Improper use of the API. */ | |
4915 | if (new_value == -1ULL) { | |
4916 | WARN("Failing ROTATION_SET_SCHEDULE command as the value requested is -1"); | |
4917 | ret = LTTNG_ERR_INVALID; | |
259c2674 JD |
4918 | goto end; |
4919 | } | |
4920 | ||
66ea93b1 JG |
4921 | /* |
4922 | * As indicated in struct ltt_session's comments, a value of == 0 means | |
4923 | * this schedule rotation type is not in use. | |
4924 | * | |
4925 | * Reject the command if we were asked to activate a schedule that was | |
4926 | * already active. | |
4927 | */ | |
4928 | if (activate && *parameter_value != 0) { | |
4929 | DBG("Failing ROTATION_SET_SCHEDULE (activate) command as the schedule is already active"); | |
4930 | ret = LTTNG_ERR_ROTATION_SCHEDULE_SET; | |
90936dcf | 4931 | goto end; |
66ea93b1 JG |
4932 | } |
4933 | ||
4934 | /* | |
4935 | * Reject the command if we were asked to deactivate a schedule that was | |
4936 | * not active. | |
4937 | */ | |
4938 | if (!activate && *parameter_value == 0) { | |
4939 | DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as the schedule is already inactive"); | |
4940 | ret = LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET; | |
90936dcf JD |
4941 | goto end; |
4942 | } | |
4943 | ||
66ea93b1 JG |
4944 | /* |
4945 | * Reject the command if we were asked to deactivate a schedule that | |
4946 | * doesn't exist. | |
4947 | */ | |
4948 | if (!activate && *parameter_value != new_value) { | |
4949 | DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as an inexistant schedule was provided"); | |
4950 | ret = LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET; | |
4951 | goto end; | |
4952 | } | |
259c2674 | 4953 | |
66ea93b1 JG |
4954 | *parameter_value = activate ? new_value : 0; |
4955 | ||
4956 | switch (schedule_type) { | |
4957 | case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC: | |
4958 | if (activate && session->active) { | |
4959 | /* | |
4960 | * Only start the timer if the session is active, | |
4961 | * otherwise it will be started when the session starts. | |
4962 | */ | |
92816cc3 JG |
4963 | ret = timer_session_rotation_schedule_timer_start( |
4964 | session, new_value); | |
259c2674 | 4965 | if (ret) { |
66ea93b1 | 4966 | ERR("Failed to enable session rotation timer in ROTATION_SET_SCHEDULE command"); |
259c2674 JD |
4967 | ret = LTTNG_ERR_UNK; |
4968 | goto end; | |
4969 | } | |
66ea93b1 | 4970 | } else { |
92816cc3 JG |
4971 | ret = timer_session_rotation_schedule_timer_stop( |
4972 | session); | |
66ea93b1 JG |
4973 | if (ret) { |
4974 | ERR("Failed to disable session rotation timer in ROTATION_SET_SCHEDULE command"); | |
4975 | ret = LTTNG_ERR_UNK; | |
f3ce6946 | 4976 | goto end; |
66ea93b1 | 4977 | } |
259c2674 | 4978 | } |
66ea93b1 JG |
4979 | break; |
4980 | case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD: | |
4981 | if (activate) { | |
4982 | ret = subscribe_session_consumed_size_rotation(session, | |
4983 | new_value, notification_thread_handle); | |
90936dcf | 4984 | if (ret) { |
66ea93b1 | 4985 | ERR("Failed to enable consumed-size notification in ROTATION_SET_SCHEDULE command"); |
90936dcf JD |
4986 | ret = LTTNG_ERR_UNK; |
4987 | goto end; | |
4988 | } | |
90936dcf | 4989 | } else { |
66ea93b1 JG |
4990 | ret = unsubscribe_session_consumed_size_rotation(session, |
4991 | notification_thread_handle); | |
90936dcf | 4992 | if (ret) { |
66ea93b1 | 4993 | ERR("Failed to disable consumed-size notification in ROTATION_SET_SCHEDULE command"); |
90936dcf JD |
4994 | ret = LTTNG_ERR_UNK; |
4995 | goto end; | |
4996 | } | |
66ea93b1 | 4997 | |
90936dcf | 4998 | } |
66ea93b1 JG |
4999 | break; |
5000 | default: | |
5001 | /* Would have been caught before. */ | |
5002 | abort(); | |
90936dcf JD |
5003 | } |
5004 | ||
259c2674 JD |
5005 | ret = LTTNG_OK; |
5006 | ||
5007 | goto end; | |
5008 | ||
5009 | end: | |
5010 | return ret; | |
5011 | } | |
5012 | ||
a503e1ef JG |
5013 | /* Wait for a given path to be removed before continuing. */ |
5014 | static enum lttng_error_code wait_on_path(void *path_data) | |
5015 | { | |
5016 | const char *shm_path = path_data; | |
5017 | ||
5018 | DBG("Waiting for the shm path at %s to be removed before completing session destruction", | |
5019 | shm_path); | |
5020 | while (true) { | |
5021 | int ret; | |
5022 | struct stat st; | |
5023 | ||
5024 | ret = stat(shm_path, &st); | |
5025 | if (ret) { | |
5026 | if (errno != ENOENT) { | |
5027 | PERROR("stat() returned an error while checking for the existence of the shm path"); | |
5028 | } else { | |
5029 | DBG("shm path no longer exists, completing the destruction of session"); | |
5030 | } | |
5031 | break; | |
5032 | } else { | |
5033 | if (!S_ISDIR(st.st_mode)) { | |
5034 | ERR("The type of shm path %s returned by stat() is not a directory; aborting the wait for shm path removal", | |
5035 | shm_path); | |
5036 | break; | |
5037 | } | |
5038 | } | |
5039 | usleep(SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US); | |
5040 | } | |
5041 | return LTTNG_OK; | |
5042 | } | |
5043 | ||
5044 | /* | |
5045 | * Returns a pointer to a handler to run on completion of a command. | |
5046 | * Returns NULL if no handler has to be run for the last command executed. | |
5047 | */ | |
5048 | const struct cmd_completion_handler *cmd_pop_completion_handler(void) | |
5049 | { | |
5050 | struct cmd_completion_handler *handler = current_completion_handler; | |
5051 | ||
5052 | current_completion_handler = NULL; | |
5053 | return handler; | |
5054 | } | |
5055 | ||
2f77fc4b DG |
5056 | /* |
5057 | * Init command subsystem. | |
5058 | */ | |
5059 | void cmd_init(void) | |
5060 | { | |
5061 | /* | |
d88aee68 DG |
5062 | * Set network sequence index to 1 for streams to match a relayd |
5063 | * socket on the consumer side. | |
2f77fc4b | 5064 | */ |
d88aee68 DG |
5065 | pthread_mutex_lock(&relayd_net_seq_idx_lock); |
5066 | relayd_net_seq_idx = 1; | |
5067 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
5068 | |
5069 | DBG("Command subsystem initialized"); | |
5070 | } |