Commit | Line | Data |
---|---|---|
2f77fc4b DG |
1 | /* |
2 | * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com> | |
bdf64013 | 3 | * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
2f77fc4b DG |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License, version 2 only, as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
16 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | */ | |
18 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
2f77fc4b | 20 | #include <assert.h> |
6dc3064a | 21 | #include <inttypes.h> |
2f77fc4b DG |
22 | #include <urcu/list.h> |
23 | #include <urcu/uatomic.h> | |
a503e1ef | 24 | #include <sys/stat.h> |
e5148e25 | 25 | #include <stdio.h> |
2f77fc4b DG |
26 | |
27 | #include <common/defaults.h> | |
28 | #include <common/common.h> | |
29 | #include <common/sessiond-comm/sessiond-comm.h> | |
30 | #include <common/relayd/relayd.h> | |
10a50311 | 31 | #include <common/utils.h> |
f5436bfc | 32 | #include <common/compat/string.h> |
93ec662e | 33 | #include <common/kernel-ctl/kernel-ctl.h> |
b0880ae5 JG |
34 | #include <common/dynamic-buffer.h> |
35 | #include <common/buffer-view.h> | |
698fb2ed | 36 | #include <common/trace-chunk.h> |
823a1989 | 37 | #include <lttng/location-internal.h> |
b0880ae5 JG |
38 | #include <lttng/trigger/trigger-internal.h> |
39 | #include <lttng/condition/condition.h> | |
40 | #include <lttng/action/action.h> | |
6e21424e | 41 | #include <lttng/channel.h> |
b0880ae5 | 42 | #include <lttng/channel-internal.h> |
5c408ad8 | 43 | #include <lttng/rotate-internal.h> |
17dd1232 | 44 | #include <lttng/location-internal.h> |
5feee503 | 45 | #include <lttng/session-internal.h> |
3c02e545 | 46 | #include <lttng/userspace-probe-internal.h> |
5feee503 | 47 | #include <lttng/session-descriptor-internal.h> |
9f449915 | 48 | #include <common/string-utils/string-utils.h> |
2f77fc4b DG |
49 | |
50 | #include "channel.h" | |
51 | #include "consumer.h" | |
52 | #include "event.h" | |
8782cc74 | 53 | #include "health-sessiond.h" |
2f77fc4b DG |
54 | #include "kernel.h" |
55 | #include "kernel-consumer.h" | |
56 | #include "lttng-sessiond.h" | |
57 | #include "utils.h" | |
0dbc2034 | 58 | #include "lttng-syscall.h" |
7c1d2758 | 59 | #include "agent.h" |
93ec662e | 60 | #include "buffer-registry.h" |
b0880ae5 JG |
61 | #include "notification-thread.h" |
62 | #include "notification-thread-commands.h" | |
5c408ad8 JD |
63 | #include "rotate.h" |
64 | #include "rotation-thread.h" | |
432b38d7 | 65 | #include "timer.h" |
f28f9e44 | 66 | #include "agent-thread.h" |
2f77fc4b DG |
67 | |
68 | #include "cmd.h" | |
69 | ||
a503e1ef JG |
70 | /* Sleep for 100ms between each check for the shm path's deletion. */ |
71 | #define SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US 100000 | |
72 | ||
823a1989 JG |
73 | struct cmd_destroy_session_reply_context { |
74 | int reply_sock_fd; | |
75 | bool implicit_rotation_on_destroy; | |
76 | }; | |
77 | ||
a503e1ef JG |
78 | static enum lttng_error_code wait_on_path(void *path); |
79 | ||
80 | /* | |
81 | * Command completion handler that is used by the destroy command | |
82 | * when a session that has a non-default shm_path is being destroyed. | |
83 | * | |
84 | * See comment in cmd_destroy_session() for the rationale. | |
85 | */ | |
86 | static struct destroy_completion_handler { | |
87 | struct cmd_completion_handler handler; | |
88 | char shm_path[member_sizeof(struct ltt_session, shm_path)]; | |
89 | } destroy_completion_handler = { | |
90 | .handler = { | |
91 | .run = wait_on_path, | |
92 | .data = destroy_completion_handler.shm_path | |
93 | }, | |
94 | .shm_path = { 0 }, | |
95 | }; | |
96 | ||
97 | static struct cmd_completion_handler *current_completion_handler; | |
98 | ||
2f77fc4b DG |
99 | /* |
100 | * Used to keep a unique index for each relayd socket created where this value | |
101 | * is associated with streams on the consumer so it can match the right relayd | |
d88aee68 DG |
102 | * to send to. It must be accessed with the relayd_net_seq_idx_lock |
103 | * held. | |
2f77fc4b | 104 | */ |
d88aee68 DG |
105 | static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER; |
106 | static uint64_t relayd_net_seq_idx; | |
2f77fc4b | 107 | |
7076b56e JG |
108 | static int validate_ust_event_name(const char *); |
109 | static int cmd_enable_event_internal(struct ltt_session *session, | |
110 | struct lttng_domain *domain, | |
111 | char *channel_name, struct lttng_event *event, | |
112 | char *filter_expression, | |
113 | struct lttng_filter_bytecode *filter, | |
114 | struct lttng_event_exclusion *exclusion, | |
115 | int wpipe); | |
116 | ||
2f77fc4b DG |
117 | /* |
118 | * Create a session path used by list_lttng_sessions for the case that the | |
119 | * session consumer is on the network. | |
120 | */ | |
121 | static int build_network_session_path(char *dst, size_t size, | |
122 | struct ltt_session *session) | |
123 | { | |
124 | int ret, kdata_port, udata_port; | |
125 | struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL; | |
126 | char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX]; | |
127 | ||
128 | assert(session); | |
129 | assert(dst); | |
130 | ||
131 | memset(tmp_urls, 0, sizeof(tmp_urls)); | |
132 | memset(tmp_uurl, 0, sizeof(tmp_uurl)); | |
133 | ||
134 | kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT; | |
135 | ||
136 | if (session->kernel_session && session->kernel_session->consumer) { | |
137 | kuri = &session->kernel_session->consumer->dst.net.control; | |
138 | kdata_port = session->kernel_session->consumer->dst.net.data.port; | |
139 | } | |
140 | ||
141 | if (session->ust_session && session->ust_session->consumer) { | |
142 | uuri = &session->ust_session->consumer->dst.net.control; | |
143 | udata_port = session->ust_session->consumer->dst.net.data.port; | |
144 | } | |
145 | ||
146 | if (uuri == NULL && kuri == NULL) { | |
147 | uri = &session->consumer->dst.net.control; | |
148 | kdata_port = session->consumer->dst.net.data.port; | |
149 | } else if (kuri && uuri) { | |
150 | ret = uri_compare(kuri, uuri); | |
151 | if (ret) { | |
152 | /* Not Equal */ | |
153 | uri = kuri; | |
154 | /* Build uuri URL string */ | |
155 | ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl)); | |
156 | if (ret < 0) { | |
157 | goto error; | |
158 | } | |
159 | } else { | |
160 | uri = kuri; | |
161 | } | |
162 | } else if (kuri && uuri == NULL) { | |
163 | uri = kuri; | |
164 | } else if (uuri && kuri == NULL) { | |
165 | uri = uuri; | |
166 | } | |
167 | ||
168 | ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls)); | |
169 | if (ret < 0) { | |
170 | goto error; | |
171 | } | |
172 | ||
9aa9f900 DG |
173 | /* |
174 | * Do we have a UST url set. If yes, this means we have both kernel and UST | |
175 | * to print. | |
176 | */ | |
9d035200 | 177 | if (*tmp_uurl != '\0') { |
2f77fc4b DG |
178 | ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]", |
179 | tmp_urls, kdata_port, tmp_uurl, udata_port); | |
180 | } else { | |
9aa9f900 | 181 | int dport; |
bef08707 | 182 | if (kuri || (!kuri && !uuri)) { |
9aa9f900 DG |
183 | dport = kdata_port; |
184 | } else { | |
185 | /* No kernel URI, use the UST port. */ | |
186 | dport = udata_port; | |
187 | } | |
188 | ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport); | |
2f77fc4b DG |
189 | } |
190 | ||
191 | error: | |
192 | return ret; | |
193 | } | |
194 | ||
fb83fe64 JD |
195 | /* |
196 | * Get run-time attributes if the session has been started (discarded events, | |
197 | * lost packets). | |
198 | */ | |
199 | static int get_kernel_runtime_stats(struct ltt_session *session, | |
200 | struct ltt_kernel_channel *kchan, uint64_t *discarded_events, | |
201 | uint64_t *lost_packets) | |
202 | { | |
203 | int ret; | |
204 | ||
205 | if (!session->has_been_started) { | |
206 | ret = 0; | |
207 | *discarded_events = 0; | |
208 | *lost_packets = 0; | |
209 | goto end; | |
210 | } | |
211 | ||
e1f3997a | 212 | ret = consumer_get_discarded_events(session->id, kchan->key, |
fb83fe64 JD |
213 | session->kernel_session->consumer, |
214 | discarded_events); | |
215 | if (ret < 0) { | |
216 | goto end; | |
217 | } | |
218 | ||
e1f3997a | 219 | ret = consumer_get_lost_packets(session->id, kchan->key, |
fb83fe64 JD |
220 | session->kernel_session->consumer, |
221 | lost_packets); | |
222 | if (ret < 0) { | |
223 | goto end; | |
224 | } | |
225 | ||
226 | end: | |
227 | return ret; | |
228 | } | |
229 | ||
230 | /* | |
231 | * Get run-time attributes if the session has been started (discarded events, | |
232 | * lost packets). | |
233 | */ | |
234 | static int get_ust_runtime_stats(struct ltt_session *session, | |
235 | struct ltt_ust_channel *uchan, uint64_t *discarded_events, | |
236 | uint64_t *lost_packets) | |
237 | { | |
238 | int ret; | |
239 | struct ltt_ust_session *usess; | |
240 | ||
a91c5803 JG |
241 | if (!discarded_events || !lost_packets) { |
242 | ret = -1; | |
243 | goto end; | |
244 | } | |
245 | ||
fb83fe64 | 246 | usess = session->ust_session; |
a905c624 JG |
247 | assert(discarded_events); |
248 | assert(lost_packets); | |
fb83fe64 JD |
249 | |
250 | if (!usess || !session->has_been_started) { | |
251 | *discarded_events = 0; | |
252 | *lost_packets = 0; | |
253 | ret = 0; | |
254 | goto end; | |
255 | } | |
256 | ||
257 | if (usess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
258 | ret = ust_app_uid_get_channel_runtime_stats(usess->id, | |
259 | &usess->buffer_reg_uid_list, | |
260 | usess->consumer, uchan->id, | |
261 | uchan->attr.overwrite, | |
262 | discarded_events, | |
263 | lost_packets); | |
264 | } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
265 | ret = ust_app_pid_get_channel_runtime_stats(usess, | |
266 | uchan, usess->consumer, | |
267 | uchan->attr.overwrite, | |
268 | discarded_events, | |
269 | lost_packets); | |
270 | if (ret < 0) { | |
271 | goto end; | |
272 | } | |
273 | *discarded_events += uchan->per_pid_closed_app_discarded; | |
274 | *lost_packets += uchan->per_pid_closed_app_lost; | |
275 | } else { | |
276 | ERR("Unsupported buffer type"); | |
967bc289 | 277 | assert(0); |
fb83fe64 JD |
278 | ret = -1; |
279 | goto end; | |
280 | } | |
281 | ||
282 | end: | |
283 | return ret; | |
284 | } | |
285 | ||
2f77fc4b DG |
286 | /* |
287 | * Fill lttng_channel array of all channels. | |
288 | */ | |
d449df4a | 289 | static ssize_t list_lttng_channels(enum lttng_domain_type domain, |
fb83fe64 | 290 | struct ltt_session *session, struct lttng_channel *channels, |
cf0bcb51 | 291 | struct lttng_channel_extended *chan_exts) |
2f77fc4b | 292 | { |
d449df4a | 293 | int i = 0, ret = 0; |
2f77fc4b DG |
294 | struct ltt_kernel_channel *kchan; |
295 | ||
296 | DBG("Listing channels for session %s", session->name); | |
297 | ||
298 | switch (domain) { | |
299 | case LTTNG_DOMAIN_KERNEL: | |
300 | /* Kernel channels */ | |
301 | if (session->kernel_session != NULL) { | |
302 | cds_list_for_each_entry(kchan, | |
303 | &session->kernel_session->channel_list.head, list) { | |
fb83fe64 | 304 | uint64_t discarded_events, lost_packets; |
cf0bcb51 JG |
305 | struct lttng_channel_extended *extended; |
306 | ||
307 | extended = (struct lttng_channel_extended *) | |
308 | kchan->channel->attr.extended.ptr; | |
fb83fe64 JD |
309 | |
310 | ret = get_kernel_runtime_stats(session, kchan, | |
311 | &discarded_events, &lost_packets); | |
312 | if (ret < 0) { | |
313 | goto end; | |
314 | } | |
2f77fc4b DG |
315 | /* Copy lttng_channel struct to array */ |
316 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
317 | channels[i].enabled = kchan->enabled; | |
fb83fe64 JD |
318 | chan_exts[i].discarded_events = |
319 | discarded_events; | |
320 | chan_exts[i].lost_packets = lost_packets; | |
cf0bcb51 JG |
321 | chan_exts[i].monitor_timer_interval = |
322 | extended->monitor_timer_interval; | |
491d1539 | 323 | chan_exts[i].blocking_timeout = 0; |
2f77fc4b DG |
324 | i++; |
325 | } | |
326 | } | |
327 | break; | |
328 | case LTTNG_DOMAIN_UST: | |
329 | { | |
330 | struct lttng_ht_iter iter; | |
331 | struct ltt_ust_channel *uchan; | |
332 | ||
e7fe706f | 333 | rcu_read_lock(); |
2f77fc4b DG |
334 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
335 | &iter.iter, uchan, node.node) { | |
a91c5803 | 336 | uint64_t discarded_events = 0, lost_packets = 0; |
fb83fe64 | 337 | |
8ee609c8 MD |
338 | if (lttng_strncpy(channels[i].name, uchan->name, |
339 | LTTNG_SYMBOL_NAME_LEN)) { | |
340 | break; | |
341 | } | |
2f77fc4b DG |
342 | channels[i].attr.overwrite = uchan->attr.overwrite; |
343 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
344 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
345 | channels[i].attr.switch_timer_interval = | |
346 | uchan->attr.switch_timer_interval; | |
347 | channels[i].attr.read_timer_interval = | |
348 | uchan->attr.read_timer_interval; | |
349 | channels[i].enabled = uchan->enabled; | |
2f785fe7 DG |
350 | channels[i].attr.tracefile_size = uchan->tracefile_size; |
351 | channels[i].attr.tracefile_count = uchan->tracefile_count; | |
5e4435a4 JG |
352 | |
353 | /* | |
354 | * Map enum lttng_ust_output to enum lttng_event_output. | |
355 | */ | |
2f77fc4b DG |
356 | switch (uchan->attr.output) { |
357 | case LTTNG_UST_MMAP: | |
2f77fc4b DG |
358 | channels[i].attr.output = LTTNG_EVENT_MMAP; |
359 | break; | |
5e4435a4 JG |
360 | default: |
361 | /* | |
362 | * LTTNG_UST_MMAP is the only supported UST | |
363 | * output mode. | |
364 | */ | |
365 | assert(0); | |
366 | break; | |
2f77fc4b | 367 | } |
fb83fe64 | 368 | |
d449df4a MD |
369 | chan_exts[i].monitor_timer_interval = |
370 | uchan->monitor_timer_interval; | |
491d1539 MD |
371 | chan_exts[i].blocking_timeout = |
372 | uchan->attr.u.s.blocking_timeout; | |
d449df4a | 373 | |
fb83fe64 JD |
374 | ret = get_ust_runtime_stats(session, uchan, |
375 | &discarded_events, &lost_packets); | |
376 | if (ret < 0) { | |
377 | break; | |
378 | } | |
379 | chan_exts[i].discarded_events = discarded_events; | |
380 | chan_exts[i].lost_packets = lost_packets; | |
2f77fc4b DG |
381 | i++; |
382 | } | |
e7fe706f | 383 | rcu_read_unlock(); |
2f77fc4b DG |
384 | break; |
385 | } | |
386 | default: | |
387 | break; | |
388 | } | |
fb83fe64 JD |
389 | |
390 | end: | |
d449df4a MD |
391 | if (ret < 0) { |
392 | return -LTTNG_ERR_FATAL; | |
393 | } else { | |
394 | return LTTNG_OK; | |
395 | } | |
2f77fc4b DG |
396 | } |
397 | ||
3c02e545 FD |
398 | static int increment_extended_len(const char *filter_expression, |
399 | struct lttng_event_exclusion *exclusion, | |
400 | const struct lttng_userspace_probe_location *probe_location, | |
401 | size_t *extended_len) | |
b4e3ceb9 | 402 | { |
3c02e545 FD |
403 | int ret = 0; |
404 | ||
b4e3ceb9 PP |
405 | *extended_len += sizeof(struct lttcomm_event_extended_header); |
406 | ||
407 | if (filter_expression) { | |
408 | *extended_len += strlen(filter_expression) + 1; | |
409 | } | |
795d57ce PP |
410 | |
411 | if (exclusion) { | |
412 | *extended_len += exclusion->count * LTTNG_SYMBOL_NAME_LEN; | |
413 | } | |
3c02e545 FD |
414 | |
415 | if (probe_location) { | |
416 | ret = lttng_userspace_probe_location_serialize(probe_location, | |
417 | NULL, NULL); | |
418 | if (ret < 0) { | |
419 | goto end; | |
420 | } | |
421 | *extended_len += ret; | |
422 | } | |
423 | ret = 0; | |
424 | end: | |
425 | return ret; | |
b4e3ceb9 PP |
426 | } |
427 | ||
3c02e545 FD |
428 | static int append_extended_info(const char *filter_expression, |
429 | struct lttng_event_exclusion *exclusion, | |
430 | struct lttng_userspace_probe_location *probe_location, | |
431 | void **extended_at) | |
b4e3ceb9 | 432 | { |
3c02e545 | 433 | int ret = 0; |
b4e3ceb9 | 434 | size_t filter_len = 0; |
795d57ce | 435 | size_t nb_exclusions = 0; |
3c02e545 FD |
436 | size_t userspace_probe_location_len = 0; |
437 | struct lttng_dynamic_buffer location_buffer; | |
438 | struct lttcomm_event_extended_header extended_header; | |
b4e3ceb9 PP |
439 | |
440 | if (filter_expression) { | |
441 | filter_len = strlen(filter_expression) + 1; | |
442 | } | |
443 | ||
795d57ce PP |
444 | if (exclusion) { |
445 | nb_exclusions = exclusion->count; | |
446 | } | |
447 | ||
3c02e545 FD |
448 | if (probe_location) { |
449 | lttng_dynamic_buffer_init(&location_buffer); | |
450 | ret = lttng_userspace_probe_location_serialize(probe_location, | |
451 | &location_buffer, NULL); | |
452 | if (ret < 0) { | |
453 | ret = -1; | |
454 | goto end; | |
455 | } | |
456 | userspace_probe_location_len = location_buffer.size; | |
457 | } | |
458 | ||
795d57ce | 459 | /* Set header fields */ |
b4e3ceb9 | 460 | extended_header.filter_len = filter_len; |
795d57ce | 461 | extended_header.nb_exclusions = nb_exclusions; |
3c02e545 | 462 | extended_header.userspace_probe_location_len = userspace_probe_location_len; |
795d57ce PP |
463 | |
464 | /* Copy header */ | |
b4e3ceb9 PP |
465 | memcpy(*extended_at, &extended_header, sizeof(extended_header)); |
466 | *extended_at += sizeof(extended_header); | |
795d57ce PP |
467 | |
468 | /* Copy filter string */ | |
469 | if (filter_expression) { | |
470 | memcpy(*extended_at, filter_expression, filter_len); | |
471 | *extended_at += filter_len; | |
472 | } | |
473 | ||
474 | /* Copy exclusion names */ | |
475 | if (exclusion) { | |
476 | size_t len = nb_exclusions * LTTNG_SYMBOL_NAME_LEN; | |
477 | ||
478 | memcpy(*extended_at, &exclusion->names, len); | |
479 | *extended_at += len; | |
480 | } | |
3c02e545 FD |
481 | |
482 | if (probe_location) { | |
483 | memcpy(*extended_at, location_buffer.data, location_buffer.size); | |
484 | *extended_at += location_buffer.size; | |
485 | lttng_dynamic_buffer_reset(&location_buffer); | |
486 | } | |
487 | ret = 0; | |
488 | end: | |
489 | return ret; | |
b4e3ceb9 PP |
490 | } |
491 | ||
3c6a091f | 492 | /* |
022d91ba | 493 | * Create a list of agent domain events. |
3c6a091f DG |
494 | * |
495 | * Return number of events in list on success or else a negative value. | |
496 | */ | |
022d91ba | 497 | static int list_lttng_agent_events(struct agent *agt, |
b4e3ceb9 | 498 | struct lttng_event **events, size_t *total_size) |
3c6a091f DG |
499 | { |
500 | int i = 0, ret = 0; | |
501 | unsigned int nb_event = 0; | |
022d91ba | 502 | struct agent_event *event; |
47e52862 | 503 | struct lttng_event *tmp_events = NULL; |
3c6a091f | 504 | struct lttng_ht_iter iter; |
b4e3ceb9 PP |
505 | size_t extended_len = 0; |
506 | void *extended_at; | |
3c6a091f | 507 | |
022d91ba | 508 | assert(agt); |
3c6a091f DG |
509 | assert(events); |
510 | ||
022d91ba | 511 | DBG3("Listing agent events"); |
3c6a091f | 512 | |
e5bbf678 | 513 | rcu_read_lock(); |
022d91ba | 514 | nb_event = lttng_ht_get_count(agt->events); |
e5bbf678 | 515 | rcu_read_unlock(); |
3c6a091f DG |
516 | if (nb_event == 0) { |
517 | ret = nb_event; | |
b4e3ceb9 | 518 | *total_size = 0; |
3c6a091f DG |
519 | goto error; |
520 | } | |
521 | ||
b4e3ceb9 PP |
522 | /* Compute required extended infos size */ |
523 | extended_len = nb_event * sizeof(struct lttcomm_event_extended_header); | |
524 | ||
525 | /* | |
526 | * This is only valid because the commands which add events are | |
527 | * processed in the same thread as the listing. | |
528 | */ | |
529 | rcu_read_lock(); | |
530 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { | |
3c02e545 | 531 | ret = increment_extended_len(event->filter_expression, NULL, NULL, |
795d57ce | 532 | &extended_len); |
3c02e545 FD |
533 | if (ret) { |
534 | DBG("Error computing the length of extended info message"); | |
535 | ret = -LTTNG_ERR_FATAL; | |
536 | goto error; | |
537 | } | |
b4e3ceb9 PP |
538 | } |
539 | rcu_read_unlock(); | |
540 | ||
541 | *total_size = nb_event * sizeof(*tmp_events) + extended_len; | |
542 | tmp_events = zmalloc(*total_size); | |
3c6a091f | 543 | if (!tmp_events) { |
022d91ba | 544 | PERROR("zmalloc agent events session"); |
3c6a091f DG |
545 | ret = -LTTNG_ERR_FATAL; |
546 | goto error; | |
547 | } | |
548 | ||
b4e3ceb9 PP |
549 | extended_at = ((uint8_t *) tmp_events) + |
550 | nb_event * sizeof(struct lttng_event); | |
551 | ||
3c6a091f | 552 | rcu_read_lock(); |
022d91ba | 553 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
3c6a091f DG |
554 | strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name)); |
555 | tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0'; | |
556 | tmp_events[i].enabled = event->enabled; | |
2106efa0 | 557 | tmp_events[i].loglevel = event->loglevel_value; |
ff94328f | 558 | tmp_events[i].loglevel_type = event->loglevel_type; |
3c6a091f | 559 | i++; |
b4e3ceb9 PP |
560 | |
561 | /* Append extended info */ | |
3c02e545 | 562 | ret = append_extended_info(event->filter_expression, NULL, NULL, |
795d57ce | 563 | &extended_at); |
3c02e545 FD |
564 | if (ret) { |
565 | DBG("Error appending extended info message"); | |
566 | ret = -LTTNG_ERR_FATAL; | |
567 | goto error; | |
568 | } | |
3c6a091f | 569 | } |
3c6a091f DG |
570 | |
571 | *events = tmp_events; | |
572 | ret = nb_event; | |
3c02e545 | 573 | assert(nb_event == i); |
3c6a091f | 574 | |
47e52862 | 575 | end: |
3c02e545 | 576 | rcu_read_unlock(); |
3c6a091f | 577 | return ret; |
47e52862 JG |
578 | error: |
579 | free(tmp_events); | |
580 | goto end; | |
3c6a091f DG |
581 | } |
582 | ||
2f77fc4b DG |
583 | /* |
584 | * Create a list of ust global domain events. | |
585 | */ | |
586 | static int list_lttng_ust_global_events(char *channel_name, | |
b4e3ceb9 PP |
587 | struct ltt_ust_domain_global *ust_global, |
588 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
589 | { |
590 | int i = 0, ret = 0; | |
591 | unsigned int nb_event = 0; | |
592 | struct lttng_ht_iter iter; | |
593 | struct lttng_ht_node_str *node; | |
594 | struct ltt_ust_channel *uchan; | |
595 | struct ltt_ust_event *uevent; | |
596 | struct lttng_event *tmp; | |
b4e3ceb9 PP |
597 | size_t extended_len = 0; |
598 | void *extended_at; | |
2f77fc4b DG |
599 | |
600 | DBG("Listing UST global events for channel %s", channel_name); | |
601 | ||
602 | rcu_read_lock(); | |
603 | ||
604 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); | |
605 | node = lttng_ht_iter_get_node_str(&iter); | |
606 | if (node == NULL) { | |
f73fabfd | 607 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
d31d3e8c | 608 | goto end; |
2f77fc4b DG |
609 | } |
610 | ||
611 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); | |
612 | ||
3c442be3 | 613 | nb_event = lttng_ht_get_count(uchan->events); |
2f77fc4b DG |
614 | if (nb_event == 0) { |
615 | ret = nb_event; | |
b4e3ceb9 | 616 | *total_size = 0; |
d31d3e8c | 617 | goto end; |
2f77fc4b DG |
618 | } |
619 | ||
620 | DBG3("Listing UST global %d events", nb_event); | |
621 | ||
b4e3ceb9 PP |
622 | /* Compute required extended infos size */ |
623 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { | |
624 | if (uevent->internal) { | |
625 | nb_event--; | |
626 | continue; | |
627 | } | |
628 | ||
3c02e545 FD |
629 | ret = increment_extended_len(uevent->filter_expression, |
630 | uevent->exclusion, NULL, &extended_len); | |
631 | if (ret) { | |
632 | DBG("Error computing the length of extended info message"); | |
633 | ret = -LTTNG_ERR_FATAL; | |
634 | goto end; | |
635 | } | |
b4e3ceb9 | 636 | } |
d31d3e8c PP |
637 | if (nb_event == 0) { |
638 | /* All events are internal, skip. */ | |
639 | ret = 0; | |
640 | *total_size = 0; | |
641 | goto end; | |
642 | } | |
b4e3ceb9 PP |
643 | |
644 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
645 | tmp = zmalloc(*total_size); | |
2f77fc4b | 646 | if (tmp == NULL) { |
b12c38df JG |
647 | ret = -LTTNG_ERR_FATAL; |
648 | goto end; | |
2f77fc4b DG |
649 | } |
650 | ||
b4e3ceb9 PP |
651 | extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event); |
652 | ||
2f77fc4b | 653 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
3c442be3 JG |
654 | if (uevent->internal) { |
655 | /* This event should remain hidden from clients */ | |
3c442be3 JG |
656 | continue; |
657 | } | |
2f77fc4b DG |
658 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
659 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
660 | tmp[i].enabled = uevent->enabled; | |
661 | ||
662 | switch (uevent->attr.instrumentation) { | |
663 | case LTTNG_UST_TRACEPOINT: | |
664 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
665 | break; | |
666 | case LTTNG_UST_PROBE: | |
667 | tmp[i].type = LTTNG_EVENT_PROBE; | |
668 | break; | |
669 | case LTTNG_UST_FUNCTION: | |
670 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
671 | break; | |
672 | } | |
673 | ||
674 | tmp[i].loglevel = uevent->attr.loglevel; | |
675 | switch (uevent->attr.loglevel_type) { | |
676 | case LTTNG_UST_LOGLEVEL_ALL: | |
677 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
678 | break; | |
679 | case LTTNG_UST_LOGLEVEL_RANGE: | |
680 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; | |
681 | break; | |
682 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
683 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; | |
684 | break; | |
685 | } | |
686 | if (uevent->filter) { | |
687 | tmp[i].filter = 1; | |
688 | } | |
4634f12e JI |
689 | if (uevent->exclusion) { |
690 | tmp[i].exclusion = 1; | |
691 | } | |
2f77fc4b | 692 | i++; |
b4e3ceb9 PP |
693 | |
694 | /* Append extended info */ | |
3c02e545 FD |
695 | ret = append_extended_info(uevent->filter_expression, |
696 | uevent->exclusion, NULL, &extended_at); | |
697 | if (ret) { | |
698 | DBG("Error appending extended info message"); | |
699 | ret = -LTTNG_ERR_FATAL; | |
700 | goto end; | |
701 | } | |
2f77fc4b DG |
702 | } |
703 | ||
704 | ret = nb_event; | |
705 | *events = tmp; | |
d31d3e8c | 706 | end: |
2f77fc4b DG |
707 | rcu_read_unlock(); |
708 | return ret; | |
709 | } | |
710 | ||
711 | /* | |
712 | * Fill lttng_event array of all kernel events in the channel. | |
713 | */ | |
714 | static int list_lttng_kernel_events(char *channel_name, | |
b4e3ceb9 PP |
715 | struct ltt_kernel_session *kernel_session, |
716 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
717 | { |
718 | int i = 0, ret; | |
719 | unsigned int nb_event; | |
720 | struct ltt_kernel_event *event; | |
721 | struct ltt_kernel_channel *kchan; | |
b4e3ceb9 PP |
722 | size_t extended_len = 0; |
723 | void *extended_at; | |
2f77fc4b DG |
724 | |
725 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
726 | if (kchan == NULL) { | |
f73fabfd | 727 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
728 | goto error; |
729 | } | |
730 | ||
731 | nb_event = kchan->event_count; | |
732 | ||
733 | DBG("Listing events for channel %s", kchan->channel->name); | |
734 | ||
735 | if (nb_event == 0) { | |
b4e3ceb9 | 736 | *total_size = 0; |
834978fd | 737 | *events = NULL; |
db906c12 | 738 | goto end; |
2f77fc4b DG |
739 | } |
740 | ||
b4e3ceb9 PP |
741 | /* Compute required extended infos size */ |
742 | cds_list_for_each_entry(event, &kchan->events_list.head, list) { | |
3c02e545 FD |
743 | ret = increment_extended_len(event->filter_expression, NULL, |
744 | event->userspace_probe_location, | |
795d57ce | 745 | &extended_len); |
3c02e545 FD |
746 | if (ret) { |
747 | DBG("Error computing the length of extended info message"); | |
748 | ret = -LTTNG_ERR_FATAL; | |
749 | goto error; | |
750 | } | |
b4e3ceb9 PP |
751 | } |
752 | ||
753 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
754 | *events = zmalloc(*total_size); | |
2f77fc4b | 755 | if (*events == NULL) { |
3c02e545 | 756 | ret = -LTTNG_ERR_FATAL; |
2f77fc4b DG |
757 | goto error; |
758 | } | |
759 | ||
ab4aa612 | 760 | extended_at = ((void *) *events) + |
b4e3ceb9 PP |
761 | nb_event * sizeof(struct lttng_event); |
762 | ||
2f77fc4b DG |
763 | /* Kernel channels */ |
764 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
765 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
766 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
767 | (*events)[i].enabled = event->enabled; | |
00f992f2 JG |
768 | (*events)[i].filter = |
769 | (unsigned char) !!event->filter_expression; | |
2f77fc4b DG |
770 | |
771 | switch (event->event->instrumentation) { | |
772 | case LTTNG_KERNEL_TRACEPOINT: | |
773 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; | |
774 | break; | |
2f77fc4b | 775 | case LTTNG_KERNEL_KRETPROBE: |
1896972b DG |
776 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
777 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
778 | sizeof(struct lttng_kernel_kprobe)); | |
779 | break; | |
780 | case LTTNG_KERNEL_KPROBE: | |
2f77fc4b DG |
781 | (*events)[i].type = LTTNG_EVENT_PROBE; |
782 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
783 | sizeof(struct lttng_kernel_kprobe)); | |
784 | break; | |
b955b4d4 FD |
785 | case LTTNG_KERNEL_UPROBE: |
786 | (*events)[i].type = LTTNG_EVENT_USERSPACE_PROBE; | |
787 | break; | |
2f77fc4b DG |
788 | case LTTNG_KERNEL_FUNCTION: |
789 | (*events)[i].type = LTTNG_EVENT_FUNCTION; | |
790 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
791 | sizeof(struct lttng_kernel_function)); | |
792 | break; | |
793 | case LTTNG_KERNEL_NOOP: | |
794 | (*events)[i].type = LTTNG_EVENT_NOOP; | |
795 | break; | |
796 | case LTTNG_KERNEL_SYSCALL: | |
797 | (*events)[i].type = LTTNG_EVENT_SYSCALL; | |
798 | break; | |
799 | case LTTNG_KERNEL_ALL: | |
1ab8c2ad FD |
800 | /* fall-through. */ |
801 | default: | |
2f77fc4b DG |
802 | assert(0); |
803 | break; | |
804 | } | |
805 | i++; | |
b4e3ceb9 PP |
806 | |
807 | /* Append extended info */ | |
3c02e545 FD |
808 | ret = append_extended_info(event->filter_expression, NULL, |
809 | event->userspace_probe_location, &extended_at); | |
810 | if (ret) { | |
811 | DBG("Error appending extended info message"); | |
812 | ret = -LTTNG_ERR_FATAL; | |
813 | goto error; | |
814 | } | |
2f77fc4b DG |
815 | } |
816 | ||
db906c12 | 817 | end: |
2f77fc4b DG |
818 | return nb_event; |
819 | ||
820 | error: | |
f73fabfd DG |
821 | /* Negate the error code to differentiate the size from an error */ |
822 | return -ret; | |
2f77fc4b DG |
823 | } |
824 | ||
825 | /* | |
826 | * Add URI so the consumer output object. Set the correct path depending on the | |
827 | * domain adding the default trace directory. | |
828 | */ | |
5feee503 JG |
829 | static enum lttng_error_code add_uri_to_consumer( |
830 | const struct ltt_session *session, | |
831 | struct consumer_output *consumer, | |
832 | struct lttng_uri *uri, enum lttng_domain_type domain) | |
2f77fc4b | 833 | { |
5feee503 JG |
834 | int ret; |
835 | enum lttng_error_code ret_code = LTTNG_OK; | |
2f77fc4b DG |
836 | |
837 | assert(uri); | |
838 | ||
839 | if (consumer == NULL) { | |
840 | DBG("No consumer detected. Don't add URI. Stopping."); | |
5feee503 | 841 | ret_code = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
842 | goto error; |
843 | } | |
844 | ||
845 | switch (domain) { | |
846 | case LTTNG_DOMAIN_KERNEL: | |
5feee503 JG |
847 | ret = lttng_strncpy(consumer->domain_subdir, |
848 | DEFAULT_KERNEL_TRACE_DIR, | |
849 | sizeof(consumer->domain_subdir)); | |
2f77fc4b DG |
850 | break; |
851 | case LTTNG_DOMAIN_UST: | |
5feee503 JG |
852 | ret = lttng_strncpy(consumer->domain_subdir, |
853 | DEFAULT_UST_TRACE_DIR, | |
854 | sizeof(consumer->domain_subdir)); | |
2f77fc4b DG |
855 | break; |
856 | default: | |
857 | /* | |
5feee503 JG |
858 | * This case is possible is we try to add the URI to the global |
859 | * tracing session consumer object which in this case there is | |
860 | * no subdir. | |
2f77fc4b | 861 | */ |
5feee503 JG |
862 | memset(consumer->domain_subdir, 0, |
863 | sizeof(consumer->domain_subdir)); | |
864 | ret = 0; | |
865 | } | |
866 | if (ret) { | |
867 | ERR("Failed to initialize consumer output domain subdirectory"); | |
868 | ret_code = LTTNG_ERR_FATAL; | |
869 | goto error; | |
2f77fc4b DG |
870 | } |
871 | ||
872 | switch (uri->dtype) { | |
873 | case LTTNG_DST_IPV4: | |
874 | case LTTNG_DST_IPV6: | |
875 | DBG2("Setting network URI to consumer"); | |
876 | ||
df75acac DG |
877 | if (consumer->type == CONSUMER_DST_NET) { |
878 | if ((uri->stype == LTTNG_STREAM_CONTROL && | |
785d2d0d DG |
879 | consumer->dst.net.control_isset) || |
880 | (uri->stype == LTTNG_STREAM_DATA && | |
881 | consumer->dst.net.data_isset)) { | |
5feee503 | 882 | ret_code = LTTNG_ERR_URL_EXIST; |
df75acac DG |
883 | goto error; |
884 | } | |
885 | } else { | |
5feee503 | 886 | memset(&consumer->dst, 0, sizeof(consumer->dst)); |
785d2d0d DG |
887 | } |
888 | ||
2f77fc4b | 889 | /* Set URI into consumer output object */ |
5feee503 | 890 | ret = consumer_set_network_uri(session, consumer, uri); |
2f77fc4b | 891 | if (ret < 0) { |
5feee503 | 892 | ret_code = -ret; |
2f77fc4b DG |
893 | goto error; |
894 | } else if (ret == 1) { | |
895 | /* | |
896 | * URI was the same in the consumer so we do not append the subdir | |
897 | * again so to not duplicate output dir. | |
898 | */ | |
5feee503 | 899 | ret_code = LTTNG_OK; |
2f77fc4b DG |
900 | goto error; |
901 | } | |
2f77fc4b DG |
902 | break; |
903 | case LTTNG_DST_PATH: | |
5feee503 JG |
904 | if (*uri->dst.path != '/' || strstr(uri->dst.path, "../")) { |
905 | ret_code = LTTNG_ERR_INVALID; | |
9ac05d92 MD |
906 | goto error; |
907 | } | |
5feee503 JG |
908 | DBG2("Setting trace directory path from URI to %s", |
909 | uri->dst.path); | |
910 | memset(&consumer->dst, 0, sizeof(consumer->dst)); | |
911 | ||
912 | ret = lttng_strncpy(consumer->dst.session_root_path, | |
913 | uri->dst.path, | |
914 | sizeof(consumer->dst.session_root_path)); | |
2f77fc4b DG |
915 | consumer->type = CONSUMER_DST_LOCAL; |
916 | break; | |
917 | } | |
918 | ||
5feee503 | 919 | ret_code = LTTNG_OK; |
2f77fc4b | 920 | error: |
5feee503 | 921 | return ret_code; |
2f77fc4b DG |
922 | } |
923 | ||
924 | /* | |
925 | * Init tracing by creating trace directory and sending fds kernel consumer. | |
926 | */ | |
927 | static int init_kernel_tracing(struct ltt_kernel_session *session) | |
928 | { | |
929 | int ret = 0; | |
930 | struct lttng_ht_iter iter; | |
931 | struct consumer_socket *socket; | |
932 | ||
933 | assert(session); | |
934 | ||
e7fe706f DG |
935 | rcu_read_lock(); |
936 | ||
2f77fc4b DG |
937 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { |
938 | cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter, | |
939 | socket, node.node) { | |
2f77fc4b | 940 | pthread_mutex_lock(socket->lock); |
f50f23d9 | 941 | ret = kernel_consumer_send_session(socket, session); |
2f77fc4b DG |
942 | pthread_mutex_unlock(socket->lock); |
943 | if (ret < 0) { | |
f73fabfd | 944 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
945 | goto error; |
946 | } | |
947 | } | |
948 | } | |
949 | ||
950 | error: | |
e7fe706f | 951 | rcu_read_unlock(); |
2f77fc4b DG |
952 | return ret; |
953 | } | |
954 | ||
955 | /* | |
956 | * Create a socket to the relayd using the URI. | |
957 | * | |
958 | * On success, the relayd_sock pointer is set to the created socket. | |
8f07cd01 | 959 | * Else, it remains untouched and an LTTng error code is returned. |
2f77fc4b | 960 | */ |
8f07cd01 | 961 | static enum lttng_error_code create_connect_relayd(struct lttng_uri *uri, |
b31610f2 JD |
962 | struct lttcomm_relayd_sock **relayd_sock, |
963 | struct consumer_output *consumer) | |
2f77fc4b DG |
964 | { |
965 | int ret; | |
8f07cd01 | 966 | enum lttng_error_code status = LTTNG_OK; |
6151a90f | 967 | struct lttcomm_relayd_sock *rsock; |
2f77fc4b | 968 | |
6151a90f JD |
969 | rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR, |
970 | RELAYD_VERSION_COMM_MINOR); | |
971 | if (!rsock) { | |
8f07cd01 | 972 | status = LTTNG_ERR_FATAL; |
2f77fc4b DG |
973 | goto error; |
974 | } | |
975 | ||
ffe60014 DG |
976 | /* |
977 | * Connect to relayd so we can proceed with a session creation. This call | |
978 | * can possibly block for an arbitrary amount of time to set the health | |
979 | * state to be in poll execution. | |
980 | */ | |
981 | health_poll_entry(); | |
6151a90f | 982 | ret = relayd_connect(rsock); |
ffe60014 | 983 | health_poll_exit(); |
2f77fc4b DG |
984 | if (ret < 0) { |
985 | ERR("Unable to reach lttng-relayd"); | |
8f07cd01 | 986 | status = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
987 | goto free_sock; |
988 | } | |
989 | ||
990 | /* Create socket for control stream. */ | |
991 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
992 | DBG3("Creating relayd stream socket from URI"); | |
993 | ||
994 | /* Check relayd version */ | |
6151a90f | 995 | ret = relayd_version_check(rsock); |
67d5aa28 | 996 | if (ret == LTTNG_ERR_RELAYD_VERSION_FAIL) { |
8f07cd01 | 997 | status = LTTNG_ERR_RELAYD_VERSION_FAIL; |
67d5aa28 JD |
998 | goto close_sock; |
999 | } else if (ret < 0) { | |
1000 | ERR("Unable to reach lttng-relayd"); | |
8f07cd01 | 1001 | status = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
1002 | goto close_sock; |
1003 | } | |
b31610f2 JD |
1004 | consumer->relay_major_version = rsock->major; |
1005 | consumer->relay_minor_version = rsock->minor; | |
2f77fc4b DG |
1006 | } else if (uri->stype == LTTNG_STREAM_DATA) { |
1007 | DBG3("Creating relayd data socket from URI"); | |
1008 | } else { | |
1009 | /* Command is not valid */ | |
1010 | ERR("Relayd invalid stream type: %d", uri->stype); | |
8f07cd01 | 1011 | status = LTTNG_ERR_INVALID; |
2f77fc4b DG |
1012 | goto close_sock; |
1013 | } | |
1014 | ||
6151a90f | 1015 | *relayd_sock = rsock; |
2f77fc4b | 1016 | |
8f07cd01 | 1017 | return status; |
2f77fc4b DG |
1018 | |
1019 | close_sock: | |
6151a90f JD |
1020 | /* The returned value is not useful since we are on an error path. */ |
1021 | (void) relayd_close(rsock); | |
2f77fc4b | 1022 | free_sock: |
6151a90f | 1023 | free(rsock); |
2f77fc4b | 1024 | error: |
8f07cd01 | 1025 | return status; |
2f77fc4b DG |
1026 | } |
1027 | ||
1028 | /* | |
1029 | * Connect to the relayd using URI and send the socket to the right consumer. | |
43fade62 JG |
1030 | * |
1031 | * The consumer socket lock must be held by the caller. | |
8f07cd01 JG |
1032 | * |
1033 | * Returns LTTNG_OK on success or an LTTng error code on failure. | |
2f77fc4b | 1034 | */ |
8f07cd01 JG |
1035 | static enum lttng_error_code send_consumer_relayd_socket( |
1036 | unsigned int session_id, | |
3044f922 | 1037 | struct lttng_uri *relayd_uri, |
56a37563 | 1038 | struct consumer_output *consumer, |
d3e2ba59 | 1039 | struct consumer_socket *consumer_sock, |
65ff8ea3 | 1040 | const char *session_name, const char *hostname, |
6ef36453 | 1041 | const char *base_path, int session_live_timer, |
0fb564b1 | 1042 | const uint64_t *current_chunk_id, |
55ce50b6 MD |
1043 | time_t session_creation_time, |
1044 | bool session_name_contains_creation_time) | |
2f77fc4b DG |
1045 | { |
1046 | int ret; | |
6151a90f | 1047 | struct lttcomm_relayd_sock *rsock = NULL; |
8f07cd01 | 1048 | enum lttng_error_code status; |
2f77fc4b | 1049 | |
ffe60014 | 1050 | /* Connect to relayd and make version check if uri is the control. */ |
8f07cd01 JG |
1051 | status = create_connect_relayd(relayd_uri, &rsock, consumer); |
1052 | if (status != LTTNG_OK) { | |
9e218353 | 1053 | goto relayd_comm_error; |
ffe60014 | 1054 | } |
6151a90f | 1055 | assert(rsock); |
ffe60014 | 1056 | |
2f77fc4b | 1057 | /* Set the network sequence index if not set. */ |
d88aee68 DG |
1058 | if (consumer->net_seq_index == (uint64_t) -1ULL) { |
1059 | pthread_mutex_lock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
1060 | /* |
1061 | * Increment net_seq_idx because we are about to transfer the | |
1062 | * new relayd socket to the consumer. | |
d88aee68 | 1063 | * Assign unique key so the consumer can match streams. |
2f77fc4b | 1064 | */ |
d88aee68 DG |
1065 | consumer->net_seq_index = ++relayd_net_seq_idx; |
1066 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
1067 | } |
1068 | ||
2f77fc4b | 1069 | /* Send relayd socket to consumer. */ |
6151a90f | 1070 | ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer, |
d3e2ba59 | 1071 | relayd_uri->stype, session_id, |
6ef36453 MD |
1072 | session_name, hostname, base_path, |
1073 | session_live_timer, current_chunk_id, | |
55ce50b6 | 1074 | session_creation_time, session_name_contains_creation_time); |
2f77fc4b | 1075 | if (ret < 0) { |
8f07cd01 | 1076 | status = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
1077 | goto close_sock; |
1078 | } | |
1079 | ||
c890b720 DG |
1080 | /* Flag that the corresponding socket was sent. */ |
1081 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
ffe60014 | 1082 | consumer_sock->control_sock_sent = 1; |
c890b720 | 1083 | } else if (relayd_uri->stype == LTTNG_STREAM_DATA) { |
ffe60014 | 1084 | consumer_sock->data_sock_sent = 1; |
c890b720 DG |
1085 | } |
1086 | ||
2f77fc4b DG |
1087 | /* |
1088 | * Close socket which was dup on the consumer side. The session daemon does | |
1089 | * NOT keep track of the relayd socket(s) once transfer to the consumer. | |
1090 | */ | |
1091 | ||
1092 | close_sock: | |
8f07cd01 | 1093 | if (status != LTTNG_OK) { |
ffe60014 | 1094 | /* |
d9078d0c DG |
1095 | * The consumer output for this session should not be used anymore |
1096 | * since the relayd connection failed thus making any tracing or/and | |
1097 | * streaming not usable. | |
ffe60014 | 1098 | */ |
d9078d0c | 1099 | consumer->enabled = 0; |
ffe60014 | 1100 | } |
9e218353 JR |
1101 | (void) relayd_close(rsock); |
1102 | free(rsock); | |
1103 | ||
1104 | relayd_comm_error: | |
8f07cd01 | 1105 | return status; |
2f77fc4b DG |
1106 | } |
1107 | ||
1108 | /* | |
1109 | * Send both relayd sockets to a specific consumer and domain. This is a | |
1110 | * helper function to facilitate sending the information to the consumer for a | |
1111 | * session. | |
43fade62 JG |
1112 | * |
1113 | * The consumer socket lock must be held by the caller. | |
8f07cd01 JG |
1114 | * |
1115 | * Returns LTTNG_OK, or an LTTng error code on failure. | |
2f77fc4b | 1116 | */ |
8f07cd01 JG |
1117 | static enum lttng_error_code send_consumer_relayd_sockets( |
1118 | enum lttng_domain_type domain, | |
56a37563 | 1119 | unsigned int session_id, struct consumer_output *consumer, |
65ff8ea3 | 1120 | struct consumer_socket *sock, const char *session_name, |
6ef36453 | 1121 | const char *hostname, const char *base_path, int session_live_timer, |
55ce50b6 MD |
1122 | const uint64_t *current_chunk_id, time_t session_creation_time, |
1123 | bool session_name_contains_creation_time) | |
2f77fc4b | 1124 | { |
8f07cd01 | 1125 | enum lttng_error_code status = LTTNG_OK; |
2f77fc4b | 1126 | |
2f77fc4b | 1127 | assert(consumer); |
6dc3064a | 1128 | assert(sock); |
2f77fc4b | 1129 | |
2f77fc4b | 1130 | /* Sending control relayd socket. */ |
ffe60014 | 1131 | if (!sock->control_sock_sent) { |
8f07cd01 | 1132 | status = send_consumer_relayd_socket(session_id, |
d3e2ba59 | 1133 | &consumer->dst.net.control, consumer, sock, |
6ef36453 | 1134 | session_name, hostname, base_path, session_live_timer, |
55ce50b6 MD |
1135 | current_chunk_id, session_creation_time, |
1136 | session_name_contains_creation_time); | |
8f07cd01 | 1137 | if (status != LTTNG_OK) { |
c890b720 DG |
1138 | goto error; |
1139 | } | |
2f77fc4b DG |
1140 | } |
1141 | ||
1142 | /* Sending data relayd socket. */ | |
ffe60014 | 1143 | if (!sock->data_sock_sent) { |
8f07cd01 | 1144 | status = send_consumer_relayd_socket(session_id, |
d3e2ba59 | 1145 | &consumer->dst.net.data, consumer, sock, |
6ef36453 | 1146 | session_name, hostname, base_path, session_live_timer, |
55ce50b6 MD |
1147 | current_chunk_id, session_creation_time, |
1148 | session_name_contains_creation_time); | |
8f07cd01 | 1149 | if (status != LTTNG_OK) { |
c890b720 DG |
1150 | goto error; |
1151 | } | |
2f77fc4b DG |
1152 | } |
1153 | ||
2f77fc4b | 1154 | error: |
8f07cd01 | 1155 | return status; |
2f77fc4b DG |
1156 | } |
1157 | ||
1158 | /* | |
1159 | * Setup relayd connections for a tracing session. First creates the socket to | |
1160 | * the relayd and send them to the right domain consumer. Consumer type MUST be | |
1161 | * network. | |
1162 | */ | |
ffe60014 | 1163 | int cmd_setup_relayd(struct ltt_session *session) |
2f77fc4b | 1164 | { |
f73fabfd | 1165 | int ret = LTTNG_OK; |
2f77fc4b DG |
1166 | struct ltt_ust_session *usess; |
1167 | struct ltt_kernel_session *ksess; | |
1168 | struct consumer_socket *socket; | |
1169 | struct lttng_ht_iter iter; | |
b2c25d00 | 1170 | LTTNG_OPTIONAL(uint64_t) current_chunk_id = {}; |
2f77fc4b | 1171 | |
b2c25d00 | 1172 | assert(session); |
2f77fc4b DG |
1173 | |
1174 | usess = session->ust_session; | |
1175 | ksess = session->kernel_session; | |
1176 | ||
785d2d0d | 1177 | DBG("Setting relayd for session %s", session->name); |
2f77fc4b | 1178 | |
b2c25d00 JG |
1179 | if (session->current_trace_chunk) { |
1180 | enum lttng_trace_chunk_status status = lttng_trace_chunk_get_id( | |
1181 | session->current_trace_chunk, ¤t_chunk_id.value); | |
1182 | ||
1183 | if (status == LTTNG_TRACE_CHUNK_STATUS_OK) { | |
1184 | current_chunk_id.is_set = true; | |
1185 | } else { | |
1186 | ERR("Failed to get current trace chunk id"); | |
1187 | ret = LTTNG_ERR_UNK; | |
1188 | goto error; | |
1189 | } | |
1190 | } | |
1191 | ||
e7fe706f DG |
1192 | rcu_read_lock(); |
1193 | ||
2f77fc4b DG |
1194 | if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET |
1195 | && usess->consumer->enabled) { | |
1196 | /* For each consumer socket, send relayd sockets */ | |
1197 | cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, | |
1198 | socket, node.node) { | |
2f77fc4b | 1199 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1200 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id, |
d3e2ba59 JD |
1201 | usess->consumer, socket, |
1202 | session->name, session->hostname, | |
6ef36453 | 1203 | session->base_path, |
b2c25d00 | 1204 | session->live_timer, |
0fb564b1 | 1205 | current_chunk_id.is_set ? ¤t_chunk_id.value : NULL, |
55ce50b6 MD |
1206 | session->creation_time, |
1207 | session->name_contains_creation_time); | |
2f77fc4b | 1208 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1209 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1210 | goto error; |
1211 | } | |
6dc3064a DG |
1212 | /* Session is now ready for network streaming. */ |
1213 | session->net_handle = 1; | |
2f77fc4b | 1214 | } |
b31610f2 JD |
1215 | session->consumer->relay_major_version = |
1216 | usess->consumer->relay_major_version; | |
1217 | session->consumer->relay_minor_version = | |
1218 | usess->consumer->relay_minor_version; | |
2f77fc4b DG |
1219 | } |
1220 | ||
1221 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET | |
1222 | && ksess->consumer->enabled) { | |
1223 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1224 | socket, node.node) { | |
2f77fc4b | 1225 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1226 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id, |
d3e2ba59 JD |
1227 | ksess->consumer, socket, |
1228 | session->name, session->hostname, | |
6ef36453 | 1229 | session->base_path, |
b2c25d00 | 1230 | session->live_timer, |
0fb564b1 | 1231 | current_chunk_id.is_set ? ¤t_chunk_id.value : NULL, |
55ce50b6 MD |
1232 | session->creation_time, |
1233 | session->name_contains_creation_time); | |
2f77fc4b | 1234 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1235 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1236 | goto error; |
1237 | } | |
6dc3064a DG |
1238 | /* Session is now ready for network streaming. */ |
1239 | session->net_handle = 1; | |
2f77fc4b | 1240 | } |
b31610f2 JD |
1241 | session->consumer->relay_major_version = |
1242 | ksess->consumer->relay_major_version; | |
1243 | session->consumer->relay_minor_version = | |
1244 | ksess->consumer->relay_minor_version; | |
2f77fc4b DG |
1245 | } |
1246 | ||
1247 | error: | |
e7fe706f | 1248 | rcu_read_unlock(); |
2f77fc4b DG |
1249 | return ret; |
1250 | } | |
1251 | ||
9b6c7ec5 DG |
1252 | /* |
1253 | * Start a kernel session by opening all necessary streams. | |
1254 | */ | |
1255 | static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe) | |
1256 | { | |
1257 | int ret; | |
1258 | struct ltt_kernel_channel *kchan; | |
1259 | ||
1260 | /* Open kernel metadata */ | |
07b86b52 | 1261 | if (ksess->metadata == NULL && ksess->output_traces) { |
9b6c7ec5 DG |
1262 | ret = kernel_open_metadata(ksess); |
1263 | if (ret < 0) { | |
1264 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1265 | goto error; | |
1266 | } | |
1267 | } | |
1268 | ||
1269 | /* Open kernel metadata stream */ | |
07b86b52 | 1270 | if (ksess->metadata && ksess->metadata_stream_fd < 0) { |
9b6c7ec5 DG |
1271 | ret = kernel_open_metadata_stream(ksess); |
1272 | if (ret < 0) { | |
1273 | ERR("Kernel create metadata stream failed"); | |
1274 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1275 | goto error; | |
1276 | } | |
1277 | } | |
1278 | ||
1279 | /* For each channel */ | |
1280 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
1281 | if (kchan->stream_count == 0) { | |
1282 | ret = kernel_open_channel_stream(kchan); | |
1283 | if (ret < 0) { | |
1284 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1285 | goto error; | |
1286 | } | |
1287 | /* Update the stream global counter */ | |
1288 | ksess->stream_count_global += ret; | |
1289 | } | |
1290 | } | |
1291 | ||
1292 | /* Setup kernel consumer socket and send fds to it */ | |
1293 | ret = init_kernel_tracing(ksess); | |
e43c41c5 | 1294 | if (ret != 0) { |
9b6c7ec5 DG |
1295 | ret = LTTNG_ERR_KERN_START_FAIL; |
1296 | goto error; | |
1297 | } | |
1298 | ||
1299 | /* This start the kernel tracing */ | |
1300 | ret = kernel_start_session(ksess); | |
1301 | if (ret < 0) { | |
1302 | ret = LTTNG_ERR_KERN_START_FAIL; | |
1303 | goto error; | |
1304 | } | |
1305 | ||
1306 | /* Quiescent wait after starting trace */ | |
462ae7ae | 1307 | kernel_wait_quiescent(wpipe); |
9b6c7ec5 | 1308 | |
14fb1ebe | 1309 | ksess->active = 1; |
9b6c7ec5 DG |
1310 | |
1311 | ret = LTTNG_OK; | |
1312 | ||
1313 | error: | |
1314 | return ret; | |
1315 | } | |
1316 | ||
2f77fc4b DG |
1317 | /* |
1318 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. | |
1319 | */ | |
56a37563 JG |
1320 | int cmd_disable_channel(struct ltt_session *session, |
1321 | enum lttng_domain_type domain, char *channel_name) | |
2f77fc4b DG |
1322 | { |
1323 | int ret; | |
1324 | struct ltt_ust_session *usess; | |
1325 | ||
1326 | usess = session->ust_session; | |
1327 | ||
2223c96f DG |
1328 | rcu_read_lock(); |
1329 | ||
2f77fc4b DG |
1330 | switch (domain) { |
1331 | case LTTNG_DOMAIN_KERNEL: | |
1332 | { | |
1333 | ret = channel_kernel_disable(session->kernel_session, | |
1334 | channel_name); | |
f73fabfd | 1335 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1336 | goto error; |
1337 | } | |
1338 | ||
1339 | kernel_wait_quiescent(kernel_tracer_fd); | |
1340 | break; | |
1341 | } | |
1342 | case LTTNG_DOMAIN_UST: | |
1343 | { | |
1344 | struct ltt_ust_channel *uchan; | |
1345 | struct lttng_ht *chan_ht; | |
1346 | ||
1347 | chan_ht = usess->domain_global.channels; | |
1348 | ||
1349 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
1350 | if (uchan == NULL) { | |
f73fabfd | 1351 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
1352 | goto error; |
1353 | } | |
1354 | ||
7972aab2 | 1355 | ret = channel_ust_disable(usess, uchan); |
f73fabfd | 1356 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1357 | goto error; |
1358 | } | |
1359 | break; | |
1360 | } | |
2f77fc4b | 1361 | default: |
f73fabfd | 1362 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1363 | goto error; |
1364 | } | |
1365 | ||
f73fabfd | 1366 | ret = LTTNG_OK; |
2f77fc4b DG |
1367 | |
1368 | error: | |
2223c96f | 1369 | rcu_read_unlock(); |
2f77fc4b DG |
1370 | return ret; |
1371 | } | |
1372 | ||
ccf10263 MD |
1373 | /* |
1374 | * Command LTTNG_TRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1375 | * |
1376 | * Called with session lock held. | |
ccf10263 | 1377 | */ |
56a37563 JG |
1378 | int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1379 | int pid) | |
ccf10263 MD |
1380 | { |
1381 | int ret; | |
1382 | ||
1383 | rcu_read_lock(); | |
1384 | ||
1385 | switch (domain) { | |
1386 | case LTTNG_DOMAIN_KERNEL: | |
1387 | { | |
1388 | struct ltt_kernel_session *ksess; | |
1389 | ||
1390 | ksess = session->kernel_session; | |
1391 | ||
1392 | ret = kernel_track_pid(ksess, pid); | |
1393 | if (ret != LTTNG_OK) { | |
1394 | goto error; | |
1395 | } | |
1396 | ||
1397 | kernel_wait_quiescent(kernel_tracer_fd); | |
1398 | break; | |
1399 | } | |
ccf10263 | 1400 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1401 | { |
1402 | struct ltt_ust_session *usess; | |
1403 | ||
1404 | usess = session->ust_session; | |
1405 | ||
1406 | ret = trace_ust_track_pid(usess, pid); | |
1407 | if (ret != LTTNG_OK) { | |
1408 | goto error; | |
1409 | } | |
1410 | break; | |
1411 | } | |
ccf10263 MD |
1412 | default: |
1413 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1414 | goto error; | |
1415 | } | |
1416 | ||
1417 | ret = LTTNG_OK; | |
1418 | ||
1419 | error: | |
1420 | rcu_read_unlock(); | |
1421 | return ret; | |
1422 | } | |
1423 | ||
1424 | /* | |
1425 | * Command LTTNG_UNTRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1426 | * |
1427 | * Called with session lock held. | |
ccf10263 | 1428 | */ |
56a37563 JG |
1429 | int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1430 | int pid) | |
ccf10263 MD |
1431 | { |
1432 | int ret; | |
1433 | ||
1434 | rcu_read_lock(); | |
1435 | ||
1436 | switch (domain) { | |
1437 | case LTTNG_DOMAIN_KERNEL: | |
1438 | { | |
1439 | struct ltt_kernel_session *ksess; | |
1440 | ||
1441 | ksess = session->kernel_session; | |
1442 | ||
1443 | ret = kernel_untrack_pid(ksess, pid); | |
1444 | if (ret != LTTNG_OK) { | |
1445 | goto error; | |
1446 | } | |
1447 | ||
1448 | kernel_wait_quiescent(kernel_tracer_fd); | |
1449 | break; | |
1450 | } | |
ccf10263 | 1451 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1452 | { |
1453 | struct ltt_ust_session *usess; | |
1454 | ||
1455 | usess = session->ust_session; | |
1456 | ||
1457 | ret = trace_ust_untrack_pid(usess, pid); | |
1458 | if (ret != LTTNG_OK) { | |
1459 | goto error; | |
1460 | } | |
1461 | break; | |
1462 | } | |
ccf10263 MD |
1463 | default: |
1464 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1465 | goto error; | |
1466 | } | |
1467 | ||
1468 | ret = LTTNG_OK; | |
1469 | ||
1470 | error: | |
1471 | rcu_read_unlock(); | |
1472 | return ret; | |
1473 | } | |
1474 | ||
2f77fc4b DG |
1475 | /* |
1476 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
1477 | * | |
1478 | * The wpipe arguments is used as a notifier for the kernel thread. | |
1479 | */ | |
1480 | int cmd_enable_channel(struct ltt_session *session, | |
7972aab2 | 1481 | struct lttng_domain *domain, struct lttng_channel *attr, int wpipe) |
2f77fc4b DG |
1482 | { |
1483 | int ret; | |
1484 | struct ltt_ust_session *usess = session->ust_session; | |
1485 | struct lttng_ht *chan_ht; | |
1f345e94 | 1486 | size_t len; |
2f77fc4b DG |
1487 | |
1488 | assert(session); | |
1489 | assert(attr); | |
7972aab2 | 1490 | assert(domain); |
2f77fc4b | 1491 | |
f5436bfc | 1492 | len = lttng_strnlen(attr->name, sizeof(attr->name)); |
1f345e94 PP |
1493 | |
1494 | /* Validate channel name */ | |
1495 | if (attr->name[0] == '.' || | |
1496 | memchr(attr->name, '/', len) != NULL) { | |
1497 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1498 | goto end; | |
1499 | } | |
1500 | ||
2f77fc4b DG |
1501 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
1502 | ||
03b4fdcf DG |
1503 | rcu_read_lock(); |
1504 | ||
ecc48a90 JD |
1505 | /* |
1506 | * Don't try to enable a channel if the session has been started at | |
1507 | * some point in time before. The tracer does not allow it. | |
1508 | */ | |
8382cf6f | 1509 | if (session->has_been_started) { |
ecc48a90 JD |
1510 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
1511 | goto error; | |
1512 | } | |
1513 | ||
1514 | /* | |
1515 | * If the session is a live session, remove the switch timer, the | |
1516 | * live timer does the same thing but sends also synchronisation | |
1517 | * beacons for inactive streams. | |
1518 | */ | |
1519 | if (session->live_timer > 0) { | |
1520 | attr->attr.live_timer_interval = session->live_timer; | |
1521 | attr->attr.switch_timer_interval = 0; | |
1522 | } | |
1523 | ||
6e21424e JR |
1524 | /* Check for feature support */ |
1525 | switch (domain->type) { | |
1526 | case LTTNG_DOMAIN_KERNEL: | |
1527 | { | |
1528 | if (kernel_supports_ring_buffer_snapshot_sample_positions(kernel_tracer_fd) != 1) { | |
1529 | /* Sampling position of buffer is not supported */ | |
1530 | WARN("Kernel tracer does not support buffer monitoring. " | |
1531 | "Setting the monitor interval timer to 0 " | |
1532 | "(disabled) for channel '%s' of session '%s'", | |
1533 | attr-> name, session->name); | |
1534 | lttng_channel_set_monitor_timer_interval(attr, 0); | |
1535 | } | |
1536 | break; | |
1537 | } | |
1538 | case LTTNG_DOMAIN_UST: | |
f28f9e44 | 1539 | break; |
6e21424e JR |
1540 | case LTTNG_DOMAIN_JUL: |
1541 | case LTTNG_DOMAIN_LOG4J: | |
1542 | case LTTNG_DOMAIN_PYTHON: | |
f28f9e44 JG |
1543 | if (!agent_tracing_is_enabled()) { |
1544 | DBG("Attempted to enable a channel in an agent domain but the agent thread is not running"); | |
1545 | ret = LTTNG_ERR_AGENT_TRACING_DISABLED; | |
1546 | goto error; | |
1547 | } | |
6e21424e JR |
1548 | break; |
1549 | default: | |
1550 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1551 | goto error; | |
1552 | } | |
1553 | ||
7972aab2 | 1554 | switch (domain->type) { |
2f77fc4b DG |
1555 | case LTTNG_DOMAIN_KERNEL: |
1556 | { | |
1557 | struct ltt_kernel_channel *kchan; | |
1558 | ||
2f77fc4b DG |
1559 | kchan = trace_kernel_get_channel_by_name(attr->name, |
1560 | session->kernel_session); | |
1561 | if (kchan == NULL) { | |
8954c04a JG |
1562 | if (session->snapshot.nb_output > 0 || |
1563 | session->snapshot_mode) { | |
1564 | /* Enforce mmap output for snapshot sessions. */ | |
1565 | attr->attr.output = LTTNG_EVENT_MMAP; | |
1566 | } | |
2f77fc4b | 1567 | ret = channel_kernel_create(session->kernel_session, attr, wpipe); |
85076754 MD |
1568 | if (attr->name[0] != '\0') { |
1569 | session->kernel_session->has_non_default_channel = 1; | |
1570 | } | |
2f77fc4b DG |
1571 | } else { |
1572 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
1573 | } | |
1574 | ||
f73fabfd | 1575 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1576 | goto error; |
1577 | } | |
1578 | ||
784303b0 | 1579 | kernel_wait_quiescent(kernel_tracer_fd); |
2f77fc4b DG |
1580 | break; |
1581 | } | |
1582 | case LTTNG_DOMAIN_UST: | |
9232818f JG |
1583 | case LTTNG_DOMAIN_JUL: |
1584 | case LTTNG_DOMAIN_LOG4J: | |
1585 | case LTTNG_DOMAIN_PYTHON: | |
2f77fc4b DG |
1586 | { |
1587 | struct ltt_ust_channel *uchan; | |
1588 | ||
9232818f JG |
1589 | /* |
1590 | * FIXME | |
1591 | * | |
1592 | * Current agent implementation limitations force us to allow | |
1593 | * only one channel at once in "agent" subdomains. Each | |
1594 | * subdomain has a default channel name which must be strictly | |
1595 | * adhered to. | |
1596 | */ | |
1597 | if (domain->type == LTTNG_DOMAIN_JUL) { | |
1598 | if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME, | |
1599 | LTTNG_SYMBOL_NAME_LEN)) { | |
1600 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1601 | goto error; | |
1602 | } | |
1603 | } else if (domain->type == LTTNG_DOMAIN_LOG4J) { | |
1604 | if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME, | |
1605 | LTTNG_SYMBOL_NAME_LEN)) { | |
1606 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1607 | goto error; | |
1608 | } | |
1609 | } else if (domain->type == LTTNG_DOMAIN_PYTHON) { | |
1610 | if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME, | |
1611 | LTTNG_SYMBOL_NAME_LEN)) { | |
1612 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1613 | goto error; | |
1614 | } | |
1615 | } | |
1616 | ||
2f77fc4b DG |
1617 | chan_ht = usess->domain_global.channels; |
1618 | ||
1619 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); | |
1620 | if (uchan == NULL) { | |
7972aab2 | 1621 | ret = channel_ust_create(usess, attr, domain->buf_type); |
85076754 MD |
1622 | if (attr->name[0] != '\0') { |
1623 | usess->has_non_default_channel = 1; | |
1624 | } | |
2f77fc4b | 1625 | } else { |
7972aab2 | 1626 | ret = channel_ust_enable(usess, uchan); |
2f77fc4b DG |
1627 | } |
1628 | break; | |
1629 | } | |
2f77fc4b | 1630 | default: |
f73fabfd | 1631 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1632 | goto error; |
1633 | } | |
1634 | ||
8954c04a JG |
1635 | if (ret == LTTNG_OK && attr->attr.output != LTTNG_EVENT_MMAP) { |
1636 | session->has_non_mmap_channel = true; | |
1637 | } | |
2f77fc4b | 1638 | error: |
2223c96f | 1639 | rcu_read_unlock(); |
1f345e94 | 1640 | end: |
2f77fc4b DG |
1641 | return ret; |
1642 | } | |
1643 | ||
2f77fc4b DG |
1644 | /* |
1645 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1646 | */ | |
56a37563 JG |
1647 | int cmd_disable_event(struct ltt_session *session, |
1648 | enum lttng_domain_type domain, char *channel_name, | |
6e911cad | 1649 | struct lttng_event *event) |
2f77fc4b DG |
1650 | { |
1651 | int ret; | |
6e911cad MD |
1652 | char *event_name; |
1653 | ||
18a720cd MD |
1654 | DBG("Disable event command for event \'%s\'", event->name); |
1655 | ||
6e911cad MD |
1656 | event_name = event->name; |
1657 | ||
9b7431cf JG |
1658 | /* Error out on unhandled search criteria */ |
1659 | if (event->loglevel_type || event->loglevel != -1 || event->enabled | |
6e911cad | 1660 | || event->pid || event->filter || event->exclusion) { |
7076b56e JG |
1661 | ret = LTTNG_ERR_UNK; |
1662 | goto error; | |
6e911cad | 1663 | } |
2f77fc4b | 1664 | |
2223c96f DG |
1665 | rcu_read_lock(); |
1666 | ||
2f77fc4b DG |
1667 | switch (domain) { |
1668 | case LTTNG_DOMAIN_KERNEL: | |
1669 | { | |
1670 | struct ltt_kernel_channel *kchan; | |
1671 | struct ltt_kernel_session *ksess; | |
1672 | ||
1673 | ksess = session->kernel_session; | |
1674 | ||
85076754 MD |
1675 | /* |
1676 | * If a non-default channel has been created in the | |
1677 | * session, explicitely require that -c chan_name needs | |
1678 | * to be provided. | |
1679 | */ | |
1680 | if (ksess->has_non_default_channel && channel_name[0] == '\0') { | |
1681 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1682 | goto error_unlock; |
85076754 MD |
1683 | } |
1684 | ||
2f77fc4b DG |
1685 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
1686 | if (kchan == NULL) { | |
f73fabfd | 1687 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
7076b56e | 1688 | goto error_unlock; |
2f77fc4b DG |
1689 | } |
1690 | ||
6e911cad MD |
1691 | switch (event->type) { |
1692 | case LTTNG_EVENT_ALL: | |
9550ee81 | 1693 | case LTTNG_EVENT_TRACEPOINT: |
d0ae4ea8 | 1694 | case LTTNG_EVENT_SYSCALL: |
9550ee81 JR |
1695 | case LTTNG_EVENT_PROBE: |
1696 | case LTTNG_EVENT_FUNCTION: | |
1697 | case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */ | |
1698 | if (event_name[0] == '\0') { | |
1699 | ret = event_kernel_disable_event(kchan, | |
1700 | NULL, event->type); | |
29c62722 | 1701 | } else { |
d0ae4ea8 | 1702 | ret = event_kernel_disable_event(kchan, |
9550ee81 | 1703 | event_name, event->type); |
29c62722 | 1704 | } |
6e911cad | 1705 | if (ret != LTTNG_OK) { |
7076b56e | 1706 | goto error_unlock; |
6e911cad MD |
1707 | } |
1708 | break; | |
6e911cad MD |
1709 | default: |
1710 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1711 | goto error_unlock; |
2f77fc4b DG |
1712 | } |
1713 | ||
1714 | kernel_wait_quiescent(kernel_tracer_fd); | |
1715 | break; | |
1716 | } | |
1717 | case LTTNG_DOMAIN_UST: | |
1718 | { | |
1719 | struct ltt_ust_channel *uchan; | |
1720 | struct ltt_ust_session *usess; | |
1721 | ||
1722 | usess = session->ust_session; | |
1723 | ||
7076b56e JG |
1724 | if (validate_ust_event_name(event_name)) { |
1725 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1726 | goto error_unlock; | |
1727 | } | |
1728 | ||
85076754 MD |
1729 | /* |
1730 | * If a non-default channel has been created in the | |
9550ee81 | 1731 | * session, explicitly require that -c chan_name needs |
85076754 MD |
1732 | * to be provided. |
1733 | */ | |
1734 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1735 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1736 | goto error_unlock; |
85076754 MD |
1737 | } |
1738 | ||
2f77fc4b DG |
1739 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
1740 | channel_name); | |
1741 | if (uchan == NULL) { | |
f73fabfd | 1742 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
7076b56e | 1743 | goto error_unlock; |
2f77fc4b DG |
1744 | } |
1745 | ||
6e911cad MD |
1746 | switch (event->type) { |
1747 | case LTTNG_EVENT_ALL: | |
b3639870 JR |
1748 | /* |
1749 | * An empty event name means that everything | |
1750 | * should be disabled. | |
1751 | */ | |
1752 | if (event->name[0] == '\0') { | |
1753 | ret = event_ust_disable_all_tracepoints(usess, uchan); | |
77d536b2 JR |
1754 | } else { |
1755 | ret = event_ust_disable_tracepoint(usess, uchan, | |
1756 | event_name); | |
1757 | } | |
6e911cad | 1758 | if (ret != LTTNG_OK) { |
7076b56e | 1759 | goto error_unlock; |
6e911cad MD |
1760 | } |
1761 | break; | |
1762 | default: | |
1763 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1764 | goto error_unlock; |
2f77fc4b DG |
1765 | } |
1766 | ||
1767 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
1768 | channel_name); | |
1769 | break; | |
1770 | } | |
5cdb6027 | 1771 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1772 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1773 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1774 | { |
fefd409b | 1775 | struct agent *agt; |
f20baf8e DG |
1776 | struct ltt_ust_session *usess = session->ust_session; |
1777 | ||
1778 | assert(usess); | |
1779 | ||
6e911cad MD |
1780 | switch (event->type) { |
1781 | case LTTNG_EVENT_ALL: | |
1782 | break; | |
1783 | default: | |
1784 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1785 | goto error_unlock; |
6e911cad MD |
1786 | } |
1787 | ||
5cdb6027 | 1788 | agt = trace_ust_find_agent(usess, domain); |
fefd409b DG |
1789 | if (!agt) { |
1790 | ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
7076b56e | 1791 | goto error_unlock; |
fefd409b | 1792 | } |
b3639870 JR |
1793 | /* |
1794 | * An empty event name means that everything | |
1795 | * should be disabled. | |
1796 | */ | |
1797 | if (event->name[0] == '\0') { | |
18a720cd MD |
1798 | ret = event_agent_disable_all(usess, agt); |
1799 | } else { | |
1800 | ret = event_agent_disable(usess, agt, event_name); | |
1801 | } | |
f20baf8e | 1802 | if (ret != LTTNG_OK) { |
7076b56e | 1803 | goto error_unlock; |
f20baf8e DG |
1804 | } |
1805 | ||
1806 | break; | |
1807 | } | |
2f77fc4b | 1808 | default: |
f73fabfd | 1809 | ret = LTTNG_ERR_UND; |
7076b56e | 1810 | goto error_unlock; |
2f77fc4b DG |
1811 | } |
1812 | ||
f73fabfd | 1813 | ret = LTTNG_OK; |
2f77fc4b | 1814 | |
7076b56e | 1815 | error_unlock: |
2223c96f | 1816 | rcu_read_unlock(); |
7076b56e | 1817 | error: |
2f77fc4b DG |
1818 | return ret; |
1819 | } | |
1820 | ||
2f77fc4b DG |
1821 | /* |
1822 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1823 | */ | |
56a37563 | 1824 | int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain, |
601d5acf | 1825 | char *channel_name, struct lttng_event_context *ctx, int kwpipe) |
2f77fc4b | 1826 | { |
d5979e4a | 1827 | int ret, chan_kern_created = 0, chan_ust_created = 0; |
bdf64013 JG |
1828 | char *app_ctx_provider_name = NULL, *app_ctx_name = NULL; |
1829 | ||
9a699f7b JR |
1830 | /* |
1831 | * Don't try to add a context if the session has been started at | |
1832 | * some point in time before. The tracer does not allow it and would | |
1833 | * result in a corrupted trace. | |
1834 | */ | |
1835 | if (session->has_been_started) { | |
1836 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; | |
1837 | goto end; | |
1838 | } | |
1839 | ||
bdf64013 JG |
1840 | if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) { |
1841 | app_ctx_provider_name = ctx->u.app_ctx.provider_name; | |
1842 | app_ctx_name = ctx->u.app_ctx.ctx_name; | |
1843 | } | |
2f77fc4b DG |
1844 | |
1845 | switch (domain) { | |
1846 | case LTTNG_DOMAIN_KERNEL: | |
979e618e DG |
1847 | assert(session->kernel_session); |
1848 | ||
1849 | if (session->kernel_session->channel_count == 0) { | |
1850 | /* Create default channel */ | |
1851 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); | |
1852 | if (ret != LTTNG_OK) { | |
1853 | goto error; | |
1854 | } | |
d5979e4a | 1855 | chan_kern_created = 1; |
979e618e | 1856 | } |
2f77fc4b | 1857 | /* Add kernel context to kernel tracer */ |
601d5acf | 1858 | ret = context_kernel_add(session->kernel_session, ctx, channel_name); |
f73fabfd | 1859 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1860 | goto error; |
1861 | } | |
1862 | break; | |
bdf64013 JG |
1863 | case LTTNG_DOMAIN_JUL: |
1864 | case LTTNG_DOMAIN_LOG4J: | |
1865 | { | |
1866 | /* | |
1867 | * Validate channel name. | |
1868 | * If no channel name is given and the domain is JUL or LOG4J, | |
1869 | * set it to the appropriate domain-specific channel name. If | |
1870 | * a name is provided but does not match the expexted channel | |
1871 | * name, return an error. | |
1872 | */ | |
1873 | if (domain == LTTNG_DOMAIN_JUL && *channel_name && | |
1874 | strcmp(channel_name, | |
1875 | DEFAULT_JUL_CHANNEL_NAME)) { | |
1876 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1877 | goto error; | |
1878 | } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name && | |
1879 | strcmp(channel_name, | |
1880 | DEFAULT_LOG4J_CHANNEL_NAME)) { | |
1881 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1882 | goto error; | |
1883 | } | |
a93b3916 | 1884 | /* break is _not_ missing here. */ |
bdf64013 | 1885 | } |
2f77fc4b DG |
1886 | case LTTNG_DOMAIN_UST: |
1887 | { | |
1888 | struct ltt_ust_session *usess = session->ust_session; | |
85076754 MD |
1889 | unsigned int chan_count; |
1890 | ||
2f77fc4b DG |
1891 | assert(usess); |
1892 | ||
85076754 | 1893 | chan_count = lttng_ht_get_count(usess->domain_global.channels); |
979e618e DG |
1894 | if (chan_count == 0) { |
1895 | struct lttng_channel *attr; | |
1896 | /* Create default channel */ | |
0a9c6494 | 1897 | attr = channel_new_default_attr(domain, usess->buffer_type); |
979e618e DG |
1898 | if (attr == NULL) { |
1899 | ret = LTTNG_ERR_FATAL; | |
1900 | goto error; | |
1901 | } | |
1902 | ||
7972aab2 | 1903 | ret = channel_ust_create(usess, attr, usess->buffer_type); |
979e618e DG |
1904 | if (ret != LTTNG_OK) { |
1905 | free(attr); | |
1906 | goto error; | |
1907 | } | |
cf0bcb51 | 1908 | channel_attr_destroy(attr); |
d5979e4a | 1909 | chan_ust_created = 1; |
979e618e DG |
1910 | } |
1911 | ||
601d5acf | 1912 | ret = context_ust_add(usess, domain, ctx, channel_name); |
bdf64013 JG |
1913 | free(app_ctx_provider_name); |
1914 | free(app_ctx_name); | |
1915 | app_ctx_name = NULL; | |
1916 | app_ctx_provider_name = NULL; | |
f73fabfd | 1917 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1918 | goto error; |
1919 | } | |
1920 | break; | |
1921 | } | |
2f77fc4b | 1922 | default: |
f73fabfd | 1923 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1924 | goto error; |
1925 | } | |
1926 | ||
bdf64013 JG |
1927 | ret = LTTNG_OK; |
1928 | goto end; | |
2f77fc4b DG |
1929 | |
1930 | error: | |
d5979e4a DG |
1931 | if (chan_kern_created) { |
1932 | struct ltt_kernel_channel *kchan = | |
1933 | trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME, | |
1934 | session->kernel_session); | |
1935 | /* Created previously, this should NOT fail. */ | |
1936 | assert(kchan); | |
1937 | kernel_destroy_channel(kchan); | |
1938 | } | |
1939 | ||
1940 | if (chan_ust_created) { | |
1941 | struct ltt_ust_channel *uchan = | |
1942 | trace_ust_find_channel_by_name( | |
1943 | session->ust_session->domain_global.channels, | |
1944 | DEFAULT_CHANNEL_NAME); | |
1945 | /* Created previously, this should NOT fail. */ | |
1946 | assert(uchan); | |
1947 | /* Remove from the channel list of the session. */ | |
1948 | trace_ust_delete_channel(session->ust_session->domain_global.channels, | |
1949 | uchan); | |
1950 | trace_ust_destroy_channel(uchan); | |
1951 | } | |
bdf64013 JG |
1952 | end: |
1953 | free(app_ctx_provider_name); | |
1954 | free(app_ctx_name); | |
2f77fc4b DG |
1955 | return ret; |
1956 | } | |
1957 | ||
dac8e046 JG |
1958 | static inline bool name_starts_with(const char *name, const char *prefix) |
1959 | { | |
1960 | const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN); | |
1961 | ||
1962 | return !strncmp(name, prefix, max_cmp_len); | |
1963 | } | |
1964 | ||
1965 | /* Perform userspace-specific event name validation */ | |
1966 | static int validate_ust_event_name(const char *name) | |
1967 | { | |
1968 | int ret = 0; | |
1969 | ||
1970 | if (!name) { | |
1971 | ret = -1; | |
1972 | goto end; | |
1973 | } | |
1974 | ||
1975 | /* | |
1976 | * Check name against all internal UST event component namespaces used | |
1977 | * by the agents. | |
1978 | */ | |
1979 | if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) || | |
1980 | name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) || | |
1981 | name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) { | |
1982 | ret = -1; | |
1983 | } | |
1984 | ||
1985 | end: | |
1986 | return ret; | |
1987 | } | |
88f06f15 | 1988 | |
2f77fc4b | 1989 | /* |
88f06f15 JG |
1990 | * Internal version of cmd_enable_event() with a supplemental |
1991 | * "internal_event" flag which is used to enable internal events which should | |
1992 | * be hidden from clients. Such events are used in the agent implementation to | |
1993 | * enable the events through which all "agent" events are funeled. | |
2f77fc4b | 1994 | */ |
88f06f15 JG |
1995 | static int _cmd_enable_event(struct ltt_session *session, |
1996 | struct lttng_domain *domain, | |
025faf73 | 1997 | char *channel_name, struct lttng_event *event, |
6b453b5e | 1998 | char *filter_expression, |
db8f1377 JI |
1999 | struct lttng_filter_bytecode *filter, |
2000 | struct lttng_event_exclusion *exclusion, | |
88f06f15 | 2001 | int wpipe, bool internal_event) |
2f77fc4b | 2002 | { |
9f449915 | 2003 | int ret = 0, channel_created = 0; |
cfedea03 | 2004 | struct lttng_channel *attr = NULL; |
2f77fc4b DG |
2005 | |
2006 | assert(session); | |
2007 | assert(event); | |
2008 | assert(channel_name); | |
2009 | ||
2a385866 JG |
2010 | /* If we have a filter, we must have its filter expression */ |
2011 | assert(!(!!filter_expression ^ !!filter)); | |
2012 | ||
9f449915 PP |
2013 | /* Normalize event name as a globbing pattern */ |
2014 | strutils_normalize_star_glob_pattern(event->name); | |
18a720cd | 2015 | |
9f449915 PP |
2016 | /* Normalize exclusion names as globbing patterns */ |
2017 | if (exclusion) { | |
2018 | size_t i; | |
f5ac4bd7 | 2019 | |
9f449915 PP |
2020 | for (i = 0; i < exclusion->count; i++) { |
2021 | char *name = LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i); | |
2022 | ||
2023 | strutils_normalize_star_glob_pattern(name); | |
2024 | } | |
930a2e99 JG |
2025 | } |
2026 | ||
9f449915 PP |
2027 | DBG("Enable event command for event \'%s\'", event->name); |
2028 | ||
2029 | rcu_read_lock(); | |
2030 | ||
7972aab2 | 2031 | switch (domain->type) { |
2f77fc4b DG |
2032 | case LTTNG_DOMAIN_KERNEL: |
2033 | { | |
2034 | struct ltt_kernel_channel *kchan; | |
2035 | ||
85076754 MD |
2036 | /* |
2037 | * If a non-default channel has been created in the | |
2038 | * session, explicitely require that -c chan_name needs | |
2039 | * to be provided. | |
2040 | */ | |
2041 | if (session->kernel_session->has_non_default_channel | |
2042 | && channel_name[0] == '\0') { | |
2043 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
2044 | goto error; | |
2045 | } | |
2046 | ||
2f77fc4b DG |
2047 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2048 | session->kernel_session); | |
2049 | if (kchan == NULL) { | |
0a9c6494 DG |
2050 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
2051 | LTTNG_BUFFER_GLOBAL); | |
2f77fc4b | 2052 | if (attr == NULL) { |
f73fabfd | 2053 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2054 | goto error; |
2055 | } | |
04c17253 MD |
2056 | if (lttng_strncpy(attr->name, channel_name, |
2057 | sizeof(attr->name))) { | |
2058 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
2059 | goto error; |
2060 | } | |
2f77fc4b DG |
2061 | |
2062 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 2063 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2064 | goto error; |
2065 | } | |
e5f5db7f | 2066 | channel_created = 1; |
2f77fc4b DG |
2067 | } |
2068 | ||
2069 | /* Get the newly created kernel channel pointer */ | |
2070 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2071 | session->kernel_session); | |
2072 | if (kchan == NULL) { | |
2073 | /* This sould not happen... */ | |
f73fabfd | 2074 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2075 | goto error; |
2076 | } | |
2077 | ||
6e911cad MD |
2078 | switch (event->type) { |
2079 | case LTTNG_EVENT_ALL: | |
29c62722 | 2080 | { |
00a62084 MD |
2081 | char *filter_expression_a = NULL; |
2082 | struct lttng_filter_bytecode *filter_a = NULL; | |
2083 | ||
2084 | /* | |
2085 | * We need to duplicate filter_expression and filter, | |
2086 | * because ownership is passed to first enable | |
2087 | * event. | |
2088 | */ | |
2089 | if (filter_expression) { | |
2090 | filter_expression_a = strdup(filter_expression); | |
2091 | if (!filter_expression_a) { | |
2092 | ret = LTTNG_ERR_FATAL; | |
2093 | goto error; | |
2094 | } | |
2095 | } | |
2096 | if (filter) { | |
2097 | filter_a = zmalloc(sizeof(*filter_a) + filter->len); | |
2098 | if (!filter_a) { | |
2099 | free(filter_expression_a); | |
2100 | ret = LTTNG_ERR_FATAL; | |
2101 | goto error; | |
2102 | } | |
2103 | memcpy(filter_a, filter, sizeof(*filter_a) + filter->len); | |
2104 | } | |
29c62722 | 2105 | event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */ |
00a62084 MD |
2106 | ret = event_kernel_enable_event(kchan, event, |
2107 | filter_expression, filter); | |
a969e101 MD |
2108 | /* We have passed ownership */ |
2109 | filter_expression = NULL; | |
2110 | filter = NULL; | |
29c62722 MD |
2111 | if (ret != LTTNG_OK) { |
2112 | if (channel_created) { | |
2113 | /* Let's not leak a useless channel. */ | |
2114 | kernel_destroy_channel(kchan); | |
2115 | } | |
00a62084 MD |
2116 | free(filter_expression_a); |
2117 | free(filter_a); | |
29c62722 MD |
2118 | goto error; |
2119 | } | |
2120 | event->type = LTTNG_EVENT_SYSCALL; /* Hack */ | |
00a62084 MD |
2121 | ret = event_kernel_enable_event(kchan, event, |
2122 | filter_expression_a, filter_a); | |
60d21fa2 AB |
2123 | /* We have passed ownership */ |
2124 | filter_expression_a = NULL; | |
2125 | filter_a = NULL; | |
29c62722 MD |
2126 | if (ret != LTTNG_OK) { |
2127 | goto error; | |
2128 | } | |
2129 | break; | |
2130 | } | |
6e6ef3d7 | 2131 | case LTTNG_EVENT_PROBE: |
dcabc190 | 2132 | case LTTNG_EVENT_USERSPACE_PROBE: |
6e6ef3d7 DG |
2133 | case LTTNG_EVENT_FUNCTION: |
2134 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
6e911cad | 2135 | case LTTNG_EVENT_TRACEPOINT: |
00a62084 MD |
2136 | ret = event_kernel_enable_event(kchan, event, |
2137 | filter_expression, filter); | |
a969e101 MD |
2138 | /* We have passed ownership */ |
2139 | filter_expression = NULL; | |
2140 | filter = NULL; | |
6e911cad MD |
2141 | if (ret != LTTNG_OK) { |
2142 | if (channel_created) { | |
2143 | /* Let's not leak a useless channel. */ | |
2144 | kernel_destroy_channel(kchan); | |
2145 | } | |
2146 | goto error; | |
e5f5db7f | 2147 | } |
6e911cad MD |
2148 | break; |
2149 | case LTTNG_EVENT_SYSCALL: | |
00a62084 MD |
2150 | ret = event_kernel_enable_event(kchan, event, |
2151 | filter_expression, filter); | |
a969e101 MD |
2152 | /* We have passed ownership */ |
2153 | filter_expression = NULL; | |
2154 | filter = NULL; | |
e2b957af MD |
2155 | if (ret != LTTNG_OK) { |
2156 | goto error; | |
2157 | } | |
6e911cad MD |
2158 | break; |
2159 | default: | |
2160 | ret = LTTNG_ERR_UNK; | |
2f77fc4b DG |
2161 | goto error; |
2162 | } | |
2163 | ||
2164 | kernel_wait_quiescent(kernel_tracer_fd); | |
2165 | break; | |
2166 | } | |
2167 | case LTTNG_DOMAIN_UST: | |
2168 | { | |
2169 | struct ltt_ust_channel *uchan; | |
2170 | struct ltt_ust_session *usess = session->ust_session; | |
2171 | ||
2172 | assert(usess); | |
2173 | ||
85076754 MD |
2174 | /* |
2175 | * If a non-default channel has been created in the | |
2176 | * session, explicitely require that -c chan_name needs | |
2177 | * to be provided. | |
2178 | */ | |
2179 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
2180 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
2181 | goto error; | |
2182 | } | |
2183 | ||
2f77fc4b DG |
2184 | /* Get channel from global UST domain */ |
2185 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2186 | channel_name); | |
2187 | if (uchan == NULL) { | |
2188 | /* Create default channel */ | |
0a9c6494 DG |
2189 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
2190 | usess->buffer_type); | |
2f77fc4b | 2191 | if (attr == NULL) { |
f73fabfd | 2192 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2193 | goto error; |
2194 | } | |
04c17253 MD |
2195 | if (lttng_strncpy(attr->name, channel_name, |
2196 | sizeof(attr->name))) { | |
2197 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
2198 | goto error; |
2199 | } | |
2f77fc4b DG |
2200 | |
2201 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 2202 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2203 | goto error; |
2204 | } | |
2f77fc4b DG |
2205 | |
2206 | /* Get the newly created channel reference back */ | |
2207 | uchan = trace_ust_find_channel_by_name( | |
2208 | usess->domain_global.channels, channel_name); | |
2209 | assert(uchan); | |
2210 | } | |
2211 | ||
141feb8c JG |
2212 | if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) { |
2213 | /* | |
2214 | * Don't allow users to add UST events to channels which | |
2215 | * are assigned to a userspace subdomain (JUL, Log4J, | |
2216 | * Python, etc.). | |
2217 | */ | |
2218 | ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN; | |
2219 | goto error; | |
2220 | } | |
2221 | ||
dac8e046 JG |
2222 | if (!internal_event) { |
2223 | /* | |
2224 | * Ensure the event name is not reserved for internal | |
2225 | * use. | |
2226 | */ | |
2227 | ret = validate_ust_event_name(event->name); | |
2228 | if (ret) { | |
2229 | WARN("Userspace event name %s failed validation.", | |
bbcab087 | 2230 | event->name); |
dac8e046 JG |
2231 | ret = LTTNG_ERR_INVALID_EVENT_NAME; |
2232 | goto error; | |
2233 | } | |
2234 | } | |
2235 | ||
2f77fc4b | 2236 | /* At this point, the session and channel exist on the tracer */ |
6b453b5e | 2237 | ret = event_ust_enable_tracepoint(usess, uchan, event, |
88f06f15 JG |
2238 | filter_expression, filter, exclusion, |
2239 | internal_event); | |
49d21f93 MD |
2240 | /* We have passed ownership */ |
2241 | filter_expression = NULL; | |
2242 | filter = NULL; | |
2243 | exclusion = NULL; | |
94382e15 JG |
2244 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2245 | goto already_enabled; | |
2246 | } else if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2247 | goto error; |
2248 | } | |
2249 | break; | |
2250 | } | |
5cdb6027 | 2251 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 2252 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2253 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 2254 | { |
da6c3a50 | 2255 | const char *default_event_name, *default_chan_name; |
fefd409b | 2256 | struct agent *agt; |
f20baf8e DG |
2257 | struct lttng_event uevent; |
2258 | struct lttng_domain tmp_dom; | |
2259 | struct ltt_ust_session *usess = session->ust_session; | |
2260 | ||
2261 | assert(usess); | |
2262 | ||
f28f9e44 JG |
2263 | if (!agent_tracing_is_enabled()) { |
2264 | DBG("Attempted to enable an event in an agent domain but the agent thread is not running"); | |
2265 | ret = LTTNG_ERR_AGENT_TRACING_DISABLED; | |
2266 | goto error; | |
2267 | } | |
2268 | ||
5cdb6027 | 2269 | agt = trace_ust_find_agent(usess, domain->type); |
fefd409b | 2270 | if (!agt) { |
5cdb6027 | 2271 | agt = agent_create(domain->type); |
fefd409b | 2272 | if (!agt) { |
e5b3c48c | 2273 | ret = LTTNG_ERR_NOMEM; |
fefd409b DG |
2274 | goto error; |
2275 | } | |
2276 | agent_add(agt, usess->agents); | |
2277 | } | |
2278 | ||
022d91ba | 2279 | /* Create the default tracepoint. */ |
996de3c7 | 2280 | memset(&uevent, 0, sizeof(uevent)); |
f20baf8e DG |
2281 | uevent.type = LTTNG_EVENT_TRACEPOINT; |
2282 | uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
51755dc8 JG |
2283 | default_event_name = event_get_default_agent_ust_name( |
2284 | domain->type); | |
da6c3a50 | 2285 | if (!default_event_name) { |
e5b3c48c | 2286 | ret = LTTNG_ERR_FATAL; |
da6c3a50 | 2287 | goto error; |
f43f95a9 | 2288 | } |
da6c3a50 | 2289 | strncpy(uevent.name, default_event_name, sizeof(uevent.name)); |
f20baf8e DG |
2290 | uevent.name[sizeof(uevent.name) - 1] = '\0'; |
2291 | ||
2292 | /* | |
2293 | * The domain type is changed because we are about to enable the | |
2294 | * default channel and event for the JUL domain that are hardcoded. | |
2295 | * This happens in the UST domain. | |
2296 | */ | |
2297 | memcpy(&tmp_dom, domain, sizeof(tmp_dom)); | |
2298 | tmp_dom.type = LTTNG_DOMAIN_UST; | |
2299 | ||
0e115563 DG |
2300 | switch (domain->type) { |
2301 | case LTTNG_DOMAIN_LOG4J: | |
da6c3a50 | 2302 | default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME; |
0e115563 DG |
2303 | break; |
2304 | case LTTNG_DOMAIN_JUL: | |
da6c3a50 | 2305 | default_chan_name = DEFAULT_JUL_CHANNEL_NAME; |
0e115563 DG |
2306 | break; |
2307 | case LTTNG_DOMAIN_PYTHON: | |
2308 | default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
2309 | break; | |
2310 | default: | |
e98a44b0 | 2311 | /* The switch/case we are in makes this impossible */ |
0e115563 | 2312 | assert(0); |
da6c3a50 DG |
2313 | } |
2314 | ||
971da06a | 2315 | { |
8404118c | 2316 | char *filter_expression_copy = NULL; |
51755dc8 | 2317 | struct lttng_filter_bytecode *filter_copy = NULL; |
971da06a JG |
2318 | |
2319 | if (filter) { | |
51755dc8 JG |
2320 | const size_t filter_size = sizeof( |
2321 | struct lttng_filter_bytecode) | |
2322 | + filter->len; | |
2323 | ||
2324 | filter_copy = zmalloc(filter_size); | |
971da06a | 2325 | if (!filter_copy) { |
018096a4 | 2326 | ret = LTTNG_ERR_NOMEM; |
b742e3e2 | 2327 | goto error; |
971da06a | 2328 | } |
51755dc8 | 2329 | memcpy(filter_copy, filter, filter_size); |
971da06a | 2330 | |
8404118c JG |
2331 | filter_expression_copy = |
2332 | strdup(filter_expression); | |
2333 | if (!filter_expression) { | |
2334 | ret = LTTNG_ERR_NOMEM; | |
51755dc8 JG |
2335 | } |
2336 | ||
2337 | if (!filter_expression_copy || !filter_copy) { | |
2338 | free(filter_expression_copy); | |
2339 | free(filter_copy); | |
2340 | goto error; | |
8404118c | 2341 | } |
971da06a JG |
2342 | } |
2343 | ||
88f06f15 | 2344 | ret = cmd_enable_event_internal(session, &tmp_dom, |
971da06a | 2345 | (char *) default_chan_name, |
8404118c JG |
2346 | &uevent, filter_expression_copy, |
2347 | filter_copy, NULL, wpipe); | |
971da06a JG |
2348 | } |
2349 | ||
94382e15 JG |
2350 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2351 | goto already_enabled; | |
2352 | } else if (ret != LTTNG_OK) { | |
f20baf8e DG |
2353 | goto error; |
2354 | } | |
2355 | ||
2356 | /* The wild card * means that everything should be enabled. */ | |
2357 | if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) { | |
8404118c JG |
2358 | ret = event_agent_enable_all(usess, agt, event, filter, |
2359 | filter_expression); | |
f20baf8e | 2360 | } else { |
8404118c JG |
2361 | ret = event_agent_enable(usess, agt, event, filter, |
2362 | filter_expression); | |
f20baf8e | 2363 | } |
51755dc8 JG |
2364 | filter = NULL; |
2365 | filter_expression = NULL; | |
f20baf8e DG |
2366 | if (ret != LTTNG_OK) { |
2367 | goto error; | |
2368 | } | |
2369 | ||
2370 | break; | |
2371 | } | |
2f77fc4b | 2372 | default: |
f73fabfd | 2373 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2374 | goto error; |
2375 | } | |
2376 | ||
f73fabfd | 2377 | ret = LTTNG_OK; |
2f77fc4b | 2378 | |
94382e15 | 2379 | already_enabled: |
2f77fc4b | 2380 | error: |
49d21f93 MD |
2381 | free(filter_expression); |
2382 | free(filter); | |
2383 | free(exclusion); | |
cf0bcb51 | 2384 | channel_attr_destroy(attr); |
2223c96f | 2385 | rcu_read_unlock(); |
2f77fc4b DG |
2386 | return ret; |
2387 | } | |
2388 | ||
88f06f15 JG |
2389 | /* |
2390 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2391 | * We own filter, exclusion, and filter_expression. | |
2392 | */ | |
2393 | int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain, | |
2394 | char *channel_name, struct lttng_event *event, | |
2395 | char *filter_expression, | |
2396 | struct lttng_filter_bytecode *filter, | |
2397 | struct lttng_event_exclusion *exclusion, | |
2398 | int wpipe) | |
2399 | { | |
2400 | return _cmd_enable_event(session, domain, channel_name, event, | |
2401 | filter_expression, filter, exclusion, wpipe, false); | |
2402 | } | |
2403 | ||
2404 | /* | |
2405 | * Enable an event which is internal to LTTng. An internal should | |
2406 | * never be made visible to clients and are immune to checks such as | |
2407 | * reserved names. | |
2408 | */ | |
2409 | static int cmd_enable_event_internal(struct ltt_session *session, | |
2410 | struct lttng_domain *domain, | |
2411 | char *channel_name, struct lttng_event *event, | |
2412 | char *filter_expression, | |
2413 | struct lttng_filter_bytecode *filter, | |
2414 | struct lttng_event_exclusion *exclusion, | |
2415 | int wpipe) | |
2416 | { | |
2417 | return _cmd_enable_event(session, domain, channel_name, event, | |
2418 | filter_expression, filter, exclusion, wpipe, true); | |
2419 | } | |
2420 | ||
2f77fc4b DG |
2421 | /* |
2422 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2423 | */ | |
56a37563 JG |
2424 | ssize_t cmd_list_tracepoints(enum lttng_domain_type domain, |
2425 | struct lttng_event **events) | |
2f77fc4b DG |
2426 | { |
2427 | int ret; | |
2428 | ssize_t nb_events = 0; | |
2429 | ||
2430 | switch (domain) { | |
2431 | case LTTNG_DOMAIN_KERNEL: | |
2432 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2433 | if (nb_events < 0) { | |
f73fabfd | 2434 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
2f77fc4b DG |
2435 | goto error; |
2436 | } | |
2437 | break; | |
2438 | case LTTNG_DOMAIN_UST: | |
2439 | nb_events = ust_app_list_events(events); | |
2440 | if (nb_events < 0) { | |
f73fabfd | 2441 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2442 | goto error; |
2443 | } | |
2444 | break; | |
5cdb6027 | 2445 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2446 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2447 | case LTTNG_DOMAIN_PYTHON: |
f60140a1 | 2448 | nb_events = agent_list_events(events, domain); |
3c6a091f DG |
2449 | if (nb_events < 0) { |
2450 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2451 | goto error; | |
2452 | } | |
2453 | break; | |
2f77fc4b | 2454 | default: |
f73fabfd | 2455 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2456 | goto error; |
2457 | } | |
2458 | ||
2459 | return nb_events; | |
2460 | ||
2461 | error: | |
2462 | /* Return negative value to differentiate return code */ | |
2463 | return -ret; | |
2464 | } | |
2465 | ||
2466 | /* | |
2467 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
2468 | */ | |
56a37563 | 2469 | ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain, |
2f77fc4b DG |
2470 | struct lttng_event_field **fields) |
2471 | { | |
2472 | int ret; | |
2473 | ssize_t nb_fields = 0; | |
2474 | ||
2475 | switch (domain) { | |
2476 | case LTTNG_DOMAIN_UST: | |
2477 | nb_fields = ust_app_list_event_fields(fields); | |
2478 | if (nb_fields < 0) { | |
f73fabfd | 2479 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2480 | goto error; |
2481 | } | |
2482 | break; | |
2483 | case LTTNG_DOMAIN_KERNEL: | |
2484 | default: /* fall-through */ | |
f73fabfd | 2485 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2486 | goto error; |
2487 | } | |
2488 | ||
2489 | return nb_fields; | |
2490 | ||
2491 | error: | |
2492 | /* Return negative value to differentiate return code */ | |
2493 | return -ret; | |
2494 | } | |
2495 | ||
834978fd DG |
2496 | ssize_t cmd_list_syscalls(struct lttng_event **events) |
2497 | { | |
2498 | return syscall_table_list(events); | |
2499 | } | |
2500 | ||
a5dfbb9d MD |
2501 | /* |
2502 | * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread. | |
2503 | * | |
2504 | * Called with session lock held. | |
2505 | */ | |
2506 | ssize_t cmd_list_tracker_pids(struct ltt_session *session, | |
56a37563 | 2507 | enum lttng_domain_type domain, int32_t **pids) |
a5dfbb9d MD |
2508 | { |
2509 | int ret; | |
2510 | ssize_t nr_pids = 0; | |
2511 | ||
2512 | switch (domain) { | |
2513 | case LTTNG_DOMAIN_KERNEL: | |
2514 | { | |
2515 | struct ltt_kernel_session *ksess; | |
2516 | ||
2517 | ksess = session->kernel_session; | |
2518 | nr_pids = kernel_list_tracker_pids(ksess, pids); | |
2519 | if (nr_pids < 0) { | |
2520 | ret = LTTNG_ERR_KERN_LIST_FAIL; | |
2521 | goto error; | |
2522 | } | |
2523 | break; | |
2524 | } | |
2525 | case LTTNG_DOMAIN_UST: | |
2526 | { | |
2527 | struct ltt_ust_session *usess; | |
2528 | ||
2529 | usess = session->ust_session; | |
2530 | nr_pids = trace_ust_list_tracker_pids(usess, pids); | |
2531 | if (nr_pids < 0) { | |
2532 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2533 | goto error; | |
2534 | } | |
2535 | break; | |
2536 | } | |
2537 | case LTTNG_DOMAIN_LOG4J: | |
2538 | case LTTNG_DOMAIN_JUL: | |
2539 | case LTTNG_DOMAIN_PYTHON: | |
2540 | default: | |
2541 | ret = LTTNG_ERR_UND; | |
2542 | goto error; | |
2543 | } | |
2544 | ||
2545 | return nr_pids; | |
2546 | ||
2547 | error: | |
2548 | /* Return negative value to differentiate return code */ | |
2549 | return -ret; | |
2550 | } | |
2551 | ||
2f77fc4b DG |
2552 | /* |
2553 | * Command LTTNG_START_TRACE processed by the client thread. | |
a9ad0c8f MD |
2554 | * |
2555 | * Called with session mutex held. | |
2f77fc4b DG |
2556 | */ |
2557 | int cmd_start_trace(struct ltt_session *session) | |
2558 | { | |
698fb2ed | 2559 | enum lttng_error_code ret; |
cde3e505 | 2560 | unsigned long nb_chan = 0; |
2f77fc4b DG |
2561 | struct ltt_kernel_session *ksession; |
2562 | struct ltt_ust_session *usess; | |
2f77fc4b DG |
2563 | |
2564 | assert(session); | |
2565 | ||
2566 | /* Ease our life a bit ;) */ | |
2567 | ksession = session->kernel_session; | |
2568 | usess = session->ust_session; | |
2569 | ||
8382cf6f DG |
2570 | /* Is the session already started? */ |
2571 | if (session->active) { | |
f73fabfd | 2572 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2573 | goto error; |
2574 | } | |
2575 | ||
cde3e505 DG |
2576 | /* |
2577 | * Starting a session without channel is useless since after that it's not | |
2578 | * possible to enable channel thus inform the client. | |
2579 | */ | |
2580 | if (usess && usess->domain_global.channels) { | |
2581 | nb_chan += lttng_ht_get_count(usess->domain_global.channels); | |
2582 | } | |
2583 | if (ksession) { | |
2584 | nb_chan += ksession->channel_count; | |
2585 | } | |
2586 | if (!nb_chan) { | |
2587 | ret = LTTNG_ERR_NO_CHANNEL; | |
2588 | goto error; | |
2589 | } | |
2590 | ||
c3ceb5e4 | 2591 | if (session->output_traces && !session->current_trace_chunk) { |
e5148e25 JG |
2592 | struct lttng_trace_chunk *trace_chunk; |
2593 | ||
2594 | trace_chunk = session_create_new_trace_chunk( | |
61ace1d3 | 2595 | session, NULL, NULL, NULL); |
e5148e25 JG |
2596 | if (!trace_chunk) { |
2597 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
2598 | goto error; | |
2599 | } | |
2600 | assert(!session->current_trace_chunk); | |
2601 | ret = session_set_trace_chunk(session, trace_chunk, NULL); | |
2602 | lttng_trace_chunk_put(trace_chunk); | |
2603 | if (ret) { | |
2604 | ret = LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER; | |
5c408ad8 JD |
2605 | goto error; |
2606 | } | |
c996624c JD |
2607 | } |
2608 | ||
2f77fc4b DG |
2609 | /* Kernel tracing */ |
2610 | if (ksession != NULL) { | |
c996624c | 2611 | DBG("Start kernel tracing session %s", session->name); |
9b6c7ec5 DG |
2612 | ret = start_kernel_session(ksession, kernel_tracer_fd); |
2613 | if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2614 | goto error; |
2615 | } | |
2f77fc4b DG |
2616 | } |
2617 | ||
2618 | /* Flag session that trace should start automatically */ | |
2619 | if (usess) { | |
698fb2ed JG |
2620 | int int_ret = ust_app_start_trace_all(usess); |
2621 | ||
2622 | if (int_ret < 0) { | |
f73fabfd | 2623 | ret = LTTNG_ERR_UST_START_FAIL; |
2f77fc4b DG |
2624 | goto error; |
2625 | } | |
2626 | } | |
2627 | ||
8382cf6f DG |
2628 | /* Flag this after a successful start. */ |
2629 | session->has_been_started = 1; | |
2630 | session->active = 1; | |
9b6c7ec5 | 2631 | |
5c408ad8 JD |
2632 | /* |
2633 | * Clear the flag that indicates that a rotation was done while the | |
2634 | * session was stopped. | |
2635 | */ | |
2636 | session->rotated_after_last_stop = false; | |
2637 | ||
259c2674 | 2638 | if (session->rotate_timer_period) { |
698fb2ed JG |
2639 | int int_ret = timer_session_rotation_schedule_timer_start( |
2640 | session, session->rotate_timer_period); | |
2641 | ||
2642 | if (int_ret < 0) { | |
259c2674 JD |
2643 | ERR("Failed to enable rotate timer"); |
2644 | ret = LTTNG_ERR_UNK; | |
2645 | goto error; | |
2646 | } | |
2647 | } | |
2648 | ||
f73fabfd | 2649 | ret = LTTNG_OK; |
2f77fc4b DG |
2650 | |
2651 | error: | |
2652 | return ret; | |
2653 | } | |
2654 | ||
2655 | /* | |
2656 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2657 | */ | |
2658 | int cmd_stop_trace(struct ltt_session *session) | |
2659 | { | |
2660 | int ret; | |
2661 | struct ltt_kernel_channel *kchan; | |
2662 | struct ltt_kernel_session *ksession; | |
2663 | struct ltt_ust_session *usess; | |
e6a80fab | 2664 | bool error_occurred = false; |
2f77fc4b DG |
2665 | |
2666 | assert(session); | |
2667 | ||
5c408ad8 | 2668 | DBG("Begin stop session %s (id %" PRIu64 ")", session->name, session->id); |
2f77fc4b DG |
2669 | /* Short cut */ |
2670 | ksession = session->kernel_session; | |
2671 | usess = session->ust_session; | |
2672 | ||
8382cf6f DG |
2673 | /* Session is not active. Skip everythong and inform the client. */ |
2674 | if (!session->active) { | |
f73fabfd | 2675 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
2f77fc4b DG |
2676 | goto error; |
2677 | } | |
2678 | ||
2f77fc4b | 2679 | /* Kernel tracer */ |
14fb1ebe | 2680 | if (ksession && ksession->active) { |
2f77fc4b DG |
2681 | DBG("Stop kernel tracing"); |
2682 | ||
566d8970 MD |
2683 | ret = kernel_stop_session(ksession); |
2684 | if (ret < 0) { | |
2685 | ret = LTTNG_ERR_KERN_STOP_FAIL; | |
2686 | goto error; | |
2687 | } | |
2688 | ||
2689 | kernel_wait_quiescent(kernel_tracer_fd); | |
2690 | ||
2691 | /* Flush metadata after stopping (if exists) */ | |
2f77fc4b DG |
2692 | if (ksession->metadata_stream_fd >= 0) { |
2693 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2694 | if (ret < 0) { | |
2695 | ERR("Kernel metadata flush failed"); | |
2696 | } | |
2697 | } | |
2698 | ||
566d8970 | 2699 | /* Flush all buffers after stopping */ |
2f77fc4b DG |
2700 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2701 | ret = kernel_flush_buffer(kchan); | |
2702 | if (ret < 0) { | |
2703 | ERR("Kernel flush buffer error"); | |
2704 | } | |
2705 | } | |
2706 | ||
14fb1ebe | 2707 | ksession->active = 0; |
5c408ad8 JD |
2708 | DBG("Kernel session stopped %s (id %" PRIu64 ")", session->name, |
2709 | session->id); | |
2f77fc4b DG |
2710 | } |
2711 | ||
14fb1ebe | 2712 | if (usess && usess->active) { |
2f77fc4b DG |
2713 | ret = ust_app_stop_trace_all(usess); |
2714 | if (ret < 0) { | |
f73fabfd | 2715 | ret = LTTNG_ERR_UST_STOP_FAIL; |
2f77fc4b DG |
2716 | goto error; |
2717 | } | |
2718 | } | |
2719 | ||
8382cf6f DG |
2720 | /* Flag inactive after a successful stop. */ |
2721 | session->active = 0; | |
e6a80fab | 2722 | ret = !error_occurred ? LTTNG_OK : LTTNG_ERR_UNK; |
2f77fc4b DG |
2723 | |
2724 | error: | |
2725 | return ret; | |
2726 | } | |
2727 | ||
2728 | /* | |
2729 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
2730 | */ | |
bda32d56 JG |
2731 | int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri, |
2732 | struct lttng_uri *uris) | |
2f77fc4b DG |
2733 | { |
2734 | int ret, i; | |
2735 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2736 | struct ltt_ust_session *usess = session->ust_session; | |
2f77fc4b DG |
2737 | |
2738 | assert(session); | |
2739 | assert(uris); | |
2740 | assert(nb_uri > 0); | |
2741 | ||
8382cf6f DG |
2742 | /* Can't set consumer URI if the session is active. */ |
2743 | if (session->active) { | |
f73fabfd | 2744 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2745 | goto error; |
2746 | } | |
2747 | ||
bda32d56 | 2748 | /* Set the "global" consumer URIs */ |
2f77fc4b | 2749 | for (i = 0; i < nb_uri; i++) { |
5feee503 JG |
2750 | ret = add_uri_to_consumer(session, |
2751 | session->consumer, | |
2752 | &uris[i], LTTNG_DOMAIN_NONE); | |
a74934ba | 2753 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2754 | goto error; |
2755 | } | |
2f77fc4b DG |
2756 | } |
2757 | ||
bda32d56 JG |
2758 | /* Set UST session URIs */ |
2759 | if (session->ust_session) { | |
2760 | for (i = 0; i < nb_uri; i++) { | |
5feee503 | 2761 | ret = add_uri_to_consumer(session, |
bda32d56 | 2762 | session->ust_session->consumer, |
5feee503 | 2763 | &uris[i], LTTNG_DOMAIN_UST); |
bda32d56 JG |
2764 | if (ret != LTTNG_OK) { |
2765 | goto error; | |
2766 | } | |
2767 | } | |
2768 | } | |
2769 | ||
2770 | /* Set kernel session URIs */ | |
2771 | if (session->kernel_session) { | |
2772 | for (i = 0; i < nb_uri; i++) { | |
5feee503 | 2773 | ret = add_uri_to_consumer(session, |
bda32d56 | 2774 | session->kernel_session->consumer, |
5feee503 | 2775 | &uris[i], LTTNG_DOMAIN_KERNEL); |
bda32d56 JG |
2776 | if (ret != LTTNG_OK) { |
2777 | goto error; | |
2778 | } | |
2779 | } | |
2780 | } | |
2781 | ||
7ab70fe0 DG |
2782 | /* |
2783 | * Make sure to set the session in output mode after we set URI since a | |
2784 | * session can be created without URL (thus flagged in no output mode). | |
2785 | */ | |
2786 | session->output_traces = 1; | |
2787 | if (ksess) { | |
2788 | ksess->output_traces = 1; | |
bda32d56 JG |
2789 | } |
2790 | ||
2791 | if (usess) { | |
7ab70fe0 DG |
2792 | usess->output_traces = 1; |
2793 | } | |
2794 | ||
2f77fc4b | 2795 | /* All good! */ |
f73fabfd | 2796 | ret = LTTNG_OK; |
2f77fc4b DG |
2797 | |
2798 | error: | |
2799 | return ret; | |
2800 | } | |
2801 | ||
5feee503 JG |
2802 | static |
2803 | enum lttng_error_code set_session_output_from_descriptor( | |
2804 | struct ltt_session *session, | |
2805 | const struct lttng_session_descriptor *descriptor) | |
2f77fc4b DG |
2806 | { |
2807 | int ret; | |
5feee503 JG |
2808 | enum lttng_error_code ret_code = LTTNG_OK; |
2809 | enum lttng_session_descriptor_type session_type = | |
2810 | lttng_session_descriptor_get_type(descriptor); | |
2811 | enum lttng_session_descriptor_output_type output_type = | |
2812 | lttng_session_descriptor_get_output_type(descriptor); | |
2813 | struct lttng_uri uris[2] = {}; | |
2814 | size_t uri_count = 0; | |
2815 | ||
2816 | switch (output_type) { | |
2817 | case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NONE: | |
2818 | goto end; | |
2819 | case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_LOCAL: | |
2820 | lttng_session_descriptor_get_local_output_uri(descriptor, | |
2821 | &uris[0]); | |
2822 | uri_count = 1; | |
2823 | break; | |
2824 | case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NETWORK: | |
2825 | lttng_session_descriptor_get_network_output_uris(descriptor, | |
2826 | &uris[0], &uris[1]); | |
2827 | uri_count = 2; | |
2828 | break; | |
2829 | default: | |
2830 | ret_code = LTTNG_ERR_INVALID; | |
48a86f68 | 2831 | goto end; |
2f77fc4b DG |
2832 | } |
2833 | ||
5feee503 JG |
2834 | switch (session_type) { |
2835 | case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT: | |
2836 | { | |
2837 | struct snapshot_output *new_output = NULL; | |
2838 | ||
2839 | new_output = snapshot_output_alloc(); | |
2840 | if (!new_output) { | |
2841 | ret_code = LTTNG_ERR_NOMEM; | |
2842 | goto end; | |
2843 | } | |
2844 | ||
2845 | ret = snapshot_output_init_with_uri(session, | |
2846 | DEFAULT_SNAPSHOT_MAX_SIZE, | |
2847 | NULL, uris, uri_count, session->consumer, | |
2848 | new_output, &session->snapshot); | |
2849 | if (ret < 0) { | |
2850 | ret_code = (ret == -ENOMEM) ? | |
2851 | LTTNG_ERR_NOMEM : LTTNG_ERR_INVALID; | |
2852 | snapshot_output_destroy(new_output); | |
2853 | goto end; | |
2854 | } | |
2855 | snapshot_add_output(&session->snapshot, new_output); | |
2856 | break; | |
2857 | } | |
2858 | case LTTNG_SESSION_DESCRIPTOR_TYPE_REGULAR: | |
2859 | case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE: | |
2860 | { | |
2861 | ret_code = cmd_set_consumer_uri(session, uri_count, uris); | |
2862 | break; | |
2863 | } | |
2864 | default: | |
2865 | ret_code = LTTNG_ERR_INVALID; | |
48a86f68 | 2866 | goto end; |
2f77fc4b | 2867 | } |
5feee503 JG |
2868 | end: |
2869 | return ret_code; | |
2870 | } | |
2871 | ||
2872 | static | |
2873 | enum lttng_error_code cmd_create_session_from_descriptor( | |
2874 | struct lttng_session_descriptor *descriptor, | |
2875 | const lttng_sock_cred *creds, | |
2876 | const char *home_path) | |
2877 | { | |
2878 | int ret; | |
2879 | enum lttng_error_code ret_code; | |
2880 | const char *session_name; | |
2881 | struct ltt_session *new_session = NULL; | |
2882 | enum lttng_session_descriptor_status descriptor_status; | |
6ef36453 | 2883 | const char *base_path; |
2f77fc4b | 2884 | |
48a86f68 | 2885 | session_lock_list(); |
5feee503 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 | |
5feee503 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 | } | |
6ef36453 MD |
2906 | ret = lttng_session_descriptor_get_base_path(descriptor, &base_path); |
2907 | if (ret) { | |
2908 | ret_code = LTTNG_ERR_INVALID; | |
2909 | goto end; | |
2910 | } | |
5feee503 | 2911 | ret_code = session_create(session_name, creds->uid, creds->gid, |
6ef36453 | 2912 | base_path, &new_session); |
5feee503 | 2913 | if (ret_code != LTTNG_OK) { |
48a86f68 | 2914 | goto end; |
2f77fc4b DG |
2915 | } |
2916 | ||
5feee503 JG |
2917 | if (!session_name) { |
2918 | ret = lttng_session_descriptor_set_session_name(descriptor, | |
2919 | new_session->name); | |
2920 | if (ret) { | |
2921 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
2922 | goto end; | |
2923 | } | |
2924 | } | |
2925 | ||
2926 | if (!lttng_session_descriptor_is_output_destination_initialized( | |
2927 | descriptor)) { | |
2928 | /* | |
2929 | * Only include the session's creation time in the output | |
2930 | * destination if the name of the session itself was | |
2931 | * not auto-generated. | |
2932 | */ | |
2933 | ret_code = lttng_session_descriptor_set_default_output( | |
2934 | descriptor, | |
2935 | session_name ? &new_session->creation_time : NULL, | |
2936 | home_path); | |
2937 | if (ret_code != LTTNG_OK) { | |
48a86f68 | 2938 | goto end; |
2bba9e53 | 2939 | } |
2bba9e53 | 2940 | } else { |
5feee503 JG |
2941 | new_session->has_user_specified_directory = |
2942 | lttng_session_descriptor_has_output_directory( | |
2943 | descriptor); | |
2f77fc4b DG |
2944 | } |
2945 | ||
5feee503 JG |
2946 | switch (lttng_session_descriptor_get_type(descriptor)) { |
2947 | case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT: | |
2948 | new_session->snapshot_mode = 1; | |
2949 | break; | |
2950 | case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE: | |
2951 | new_session->live_timer = | |
2952 | lttng_session_descriptor_live_get_timer_interval( | |
2953 | descriptor); | |
2954 | break; | |
2955 | default: | |
2956 | break; | |
2957 | } | |
2f77fc4b | 2958 | |
5feee503 JG |
2959 | ret_code = set_session_output_from_descriptor(new_session, descriptor); |
2960 | if (ret_code != LTTNG_OK) { | |
2961 | goto end; | |
2962 | } | |
2963 | new_session->consumer->enabled = 1; | |
2964 | ret_code = LTTNG_OK; | |
48a86f68 | 2965 | end: |
5feee503 JG |
2966 | /* Release reference provided by the session_create function. */ |
2967 | session_put(new_session); | |
2968 | if (ret_code != LTTNG_OK && new_session) { | |
2969 | /* Release the global reference on error. */ | |
2970 | session_destroy(new_session); | |
48a86f68 | 2971 | } |
5feee503 JG |
2972 | session_unlock_list(); |
2973 | return ret_code; | |
2f77fc4b DG |
2974 | } |
2975 | ||
5feee503 JG |
2976 | enum lttng_error_code cmd_create_session(struct command_ctx *cmd_ctx, int sock, |
2977 | struct lttng_session_descriptor **return_descriptor) | |
27babd3a DG |
2978 | { |
2979 | int ret; | |
5feee503 JG |
2980 | size_t payload_size; |
2981 | struct lttng_dynamic_buffer payload; | |
2982 | struct lttng_buffer_view home_dir_view; | |
2983 | struct lttng_buffer_view session_descriptor_view; | |
2984 | struct lttng_session_descriptor *session_descriptor = NULL; | |
2985 | enum lttng_error_code ret_code; | |
2986 | ||
2987 | lttng_dynamic_buffer_init(&payload); | |
2988 | if (cmd_ctx->lsm->u.create_session.home_dir_size >= | |
2989 | LTTNG_PATH_MAX) { | |
2990 | ret_code = LTTNG_ERR_INVALID; | |
2991 | goto error; | |
27babd3a | 2992 | } |
5feee503 JG |
2993 | if (cmd_ctx->lsm->u.create_session.session_descriptor_size > |
2994 | LTTNG_SESSION_DESCRIPTOR_MAX_LEN) { | |
2995 | ret_code = LTTNG_ERR_INVALID; | |
2996 | goto error; | |
27babd3a DG |
2997 | } |
2998 | ||
5feee503 JG |
2999 | payload_size = cmd_ctx->lsm->u.create_session.home_dir_size + |
3000 | cmd_ctx->lsm->u.create_session.session_descriptor_size; | |
3001 | ret = lttng_dynamic_buffer_set_size(&payload, payload_size); | |
3002 | if (ret) { | |
3003 | ret_code = LTTNG_ERR_NOMEM; | |
3004 | goto error; | |
27babd3a DG |
3005 | } |
3006 | ||
5feee503 JG |
3007 | ret = lttcomm_recv_unix_sock(sock, payload.data, payload.size); |
3008 | if (ret <= 0) { | |
3009 | ERR("Reception of session descriptor failed, aborting."); | |
3010 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
3011 | goto error; | |
27babd3a DG |
3012 | } |
3013 | ||
5feee503 JG |
3014 | home_dir_view = lttng_buffer_view_from_dynamic_buffer( |
3015 | &payload, | |
3016 | 0, | |
3017 | cmd_ctx->lsm->u.create_session.home_dir_size); | |
3018 | session_descriptor_view = lttng_buffer_view_from_dynamic_buffer( | |
3019 | &payload, | |
3020 | cmd_ctx->lsm->u.create_session.home_dir_size, | |
3021 | cmd_ctx->lsm->u.create_session.session_descriptor_size); | |
27babd3a | 3022 | |
5feee503 JG |
3023 | ret = lttng_session_descriptor_create_from_buffer( |
3024 | &session_descriptor_view, &session_descriptor); | |
3025 | if (ret < 0) { | |
3026 | ERR("Failed to create session descriptor from payload of \"create session\" command"); | |
3027 | ret_code = LTTNG_ERR_INVALID; | |
3028 | goto error; | |
3029 | } | |
27babd3a | 3030 | |
5feee503 JG |
3031 | /* |
3032 | * Sets the descriptor's auto-generated properties (name, output) if | |
3033 | * needed. | |
3034 | */ | |
3035 | ret_code = cmd_create_session_from_descriptor(session_descriptor, | |
3036 | &cmd_ctx->creds, | |
3037 | home_dir_view.size ? home_dir_view.data : NULL); | |
3038 | if (ret_code != LTTNG_OK) { | |
3039 | goto error; | |
48a86f68 | 3040 | } |
5feee503 JG |
3041 | |
3042 | ret_code = LTTNG_OK; | |
3043 | *return_descriptor = session_descriptor; | |
3044 | session_descriptor = NULL; | |
3045 | error: | |
3046 | lttng_dynamic_buffer_reset(&payload); | |
3047 | lttng_session_descriptor_destroy(session_descriptor); | |
3048 | return ret_code; | |
27babd3a DG |
3049 | } |
3050 | ||
823a1989 JG |
3051 | static |
3052 | void cmd_destroy_session_reply(const struct ltt_session *session, | |
3053 | void *_reply_context) | |
3054 | { | |
3055 | int ret; | |
3056 | ssize_t comm_ret; | |
3057 | const struct cmd_destroy_session_reply_context *reply_context = | |
3058 | _reply_context; | |
3059 | struct lttng_dynamic_buffer payload; | |
3060 | struct lttcomm_session_destroy_command_header cmd_header; | |
3061 | struct lttng_trace_archive_location *location = NULL; | |
3062 | struct lttcomm_lttng_msg llm = { | |
3063 | .cmd_type = LTTNG_DESTROY_SESSION, | |
3064 | .ret_code = LTTNG_OK, | |
3065 | .pid = UINT32_MAX, | |
3066 | .cmd_header_size = | |
3067 | sizeof(struct lttcomm_session_destroy_command_header), | |
3068 | .data_size = 0, | |
3069 | }; | |
3070 | size_t payload_size_before_location; | |
3071 | ||
3072 | lttng_dynamic_buffer_init(&payload); | |
3073 | ||
3074 | ret = lttng_dynamic_buffer_append(&payload, &llm, sizeof(llm)); | |
3075 | if (ret) { | |
3076 | ERR("Failed to append session destruction message"); | |
3077 | goto error; | |
3078 | } | |
3079 | ||
3080 | cmd_header.rotation_state = | |
3081 | (int32_t) (reply_context->implicit_rotation_on_destroy ? | |
3082 | session->rotation_state : | |
3083 | LTTNG_ROTATION_STATE_NO_ROTATION); | |
3084 | ret = lttng_dynamic_buffer_append(&payload, &cmd_header, | |
3085 | sizeof(cmd_header)); | |
3086 | if (ret) { | |
3087 | ERR("Failed to append session destruction command header"); | |
3088 | goto error; | |
3089 | } | |
3090 | ||
3091 | if (!reply_context->implicit_rotation_on_destroy) { | |
3092 | DBG("No implicit rotation performed during the destruction of session \"%s\", sending reply", | |
3093 | session->name); | |
3094 | goto send_reply; | |
3095 | } | |
3096 | if (session->rotation_state != LTTNG_ROTATION_STATE_COMPLETED) { | |
3097 | DBG("Rotation state of session \"%s\" is not \"completed\", sending session destruction reply", | |
3098 | session->name); | |
3099 | goto send_reply; | |
3100 | } | |
3101 | ||
3102 | location = session_get_trace_archive_location(session); | |
3103 | if (!location) { | |
3104 | ERR("Failed to get the location of the trace archive produced during the destruction of session \"%s\"", | |
3105 | session->name); | |
3106 | goto error; | |
3107 | } | |
3108 | ||
3109 | payload_size_before_location = payload.size; | |
3110 | comm_ret = lttng_trace_archive_location_serialize(location, | |
3111 | &payload); | |
3112 | if (comm_ret < 0) { | |
3113 | ERR("Failed to serialize the location of the trace archive produced during the destruction of session \"%s\"", | |
3114 | session->name); | |
3115 | goto error; | |
3116 | } | |
3117 | /* Update the message to indicate the location's length. */ | |
3118 | ((struct lttcomm_lttng_msg *) payload.data)->data_size = | |
3119 | payload.size - payload_size_before_location; | |
3120 | send_reply: | |
3121 | comm_ret = lttcomm_send_unix_sock(reply_context->reply_sock_fd, | |
3122 | payload.data, payload.size); | |
3123 | if (comm_ret != (ssize_t) payload.size) { | |
3124 | ERR("Failed to send result of the destruction of session \"%s\" to client", | |
3125 | session->name); | |
3126 | } | |
3127 | error: | |
3128 | ret = close(reply_context->reply_sock_fd); | |
3129 | if (ret) { | |
3130 | PERROR("Failed to close client socket in deferred session destroy reply"); | |
3131 | } | |
3132 | lttng_dynamic_buffer_reset(&payload); | |
3133 | free(_reply_context); | |
3134 | } | |
3135 | ||
2f77fc4b DG |
3136 | /* |
3137 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
a9ad0c8f MD |
3138 | * |
3139 | * Called with session lock held. | |
2f77fc4b | 3140 | */ |
48a86f68 | 3141 | int cmd_destroy_session(struct ltt_session *session, |
823a1989 JG |
3142 | struct notification_thread_handle *notification_thread_handle, |
3143 | int *sock_fd) | |
2f77fc4b DG |
3144 | { |
3145 | int ret; | |
823a1989 JG |
3146 | struct cmd_destroy_session_reply_context *reply_context = NULL; |
3147 | ||
3148 | if (sock_fd) { | |
3149 | reply_context = zmalloc(sizeof(*reply_context)); | |
3150 | if (!reply_context) { | |
3151 | ret = LTTNG_ERR_NOMEM; | |
3152 | goto end; | |
3153 | } | |
3154 | reply_context->reply_sock_fd = *sock_fd; | |
3155 | } | |
2f77fc4b DG |
3156 | |
3157 | /* Safety net */ | |
3158 | assert(session); | |
3159 | ||
823a1989 JG |
3160 | DBG("Begin destroy session %s (id %" PRIu64 ")", session->name, |
3161 | session->id); | |
3162 | if (session->active) { | |
3163 | DBG("Session \"%s\" is active, attempting to stop it before destroying it", | |
3164 | session->name); | |
3165 | ret = cmd_stop_trace(session); | |
3166 | if (ret != LTTNG_OK && ret != LTTNG_ERR_TRACE_ALREADY_STOPPED) { | |
3167 | /* Carry on with the destruction of the session. */ | |
3168 | ERR("Failed to stop session \"%s\" as part of its destruction: %s", | |
3169 | session->name, lttng_strerror(-ret)); | |
3170 | } | |
3171 | } | |
5c408ad8 | 3172 | |
82528808 JG |
3173 | if (session->rotation_schedule_timer_enabled) { |
3174 | if (timer_session_rotation_schedule_timer_stop( | |
3175 | session)) { | |
3176 | ERR("Failed to stop the \"rotation schedule\" timer of session %s", | |
3177 | session->name); | |
3178 | } | |
259c2674 JD |
3179 | } |
3180 | ||
90936dcf JD |
3181 | if (session->rotate_size) { |
3182 | unsubscribe_session_consumed_size_rotation(session, notification_thread_handle); | |
3183 | session->rotate_size = 0; | |
3184 | } | |
3185 | ||
e5148e25 JG |
3186 | if (session->most_recent_chunk_id.is_set && |
3187 | session->most_recent_chunk_id.value != 0 && | |
2259be0a JG |
3188 | session->current_trace_chunk && session->output_traces) { |
3189 | /* | |
3190 | * Perform a last rotation on destruction if rotations have | |
3191 | * occurred during the session's lifetime. | |
3192 | */ | |
636a3779 | 3193 | ret = cmd_rotate_session(session, NULL, false); |
e5148e25 JG |
3194 | if (ret != LTTNG_OK) { |
3195 | ERR("Failed to perform an implicit rotation as part of the destruction of session \"%s\": %s", | |
3196 | session->name, lttng_strerror(-ret)); | |
f859080e | 3197 | } |
823a1989 JG |
3198 | if (reply_context) { |
3199 | reply_context->implicit_rotation_on_destroy = true; | |
3200 | } | |
c3ceb5e4 | 3201 | } else if (session->has_been_started && session->current_trace_chunk) { |
636a3779 JG |
3202 | /* |
3203 | * The user has not triggered a session rotation. However, to | |
3204 | * ensure all data has been consumed, the session is rotated | |
3205 | * to a 'null' trace chunk before it is destroyed. | |
3206 | * | |
3207 | * This is a "quiet" rotation meaning that no notification is | |
3208 | * emitted and no renaming of the current trace chunk takes | |
3209 | * place. | |
3210 | */ | |
3211 | ret = cmd_rotate_session(session, NULL, true); | |
3212 | if (ret != LTTNG_OK) { | |
3213 | ERR("Failed to perform a quiet rotation as part of the destruction of session \"%s\": %s", | |
3214 | session->name, lttng_strerror(-ret)); | |
3215 | } | |
3216 | } | |
5c408ad8 | 3217 | |
a503e1ef JG |
3218 | if (session->shm_path[0]) { |
3219 | /* | |
3220 | * When a session is created with an explicit shm_path, | |
3221 | * the consumer daemon will create its shared memory files | |
3222 | * at that location and will *not* unlink them. This is normal | |
3223 | * as the intention of that feature is to make it possible | |
3224 | * to retrieve the content of those files should a crash occur. | |
3225 | * | |
3226 | * To ensure the content of those files can be used, the | |
3227 | * sessiond daemon will replicate the content of the metadata | |
3228 | * cache in a metadata file. | |
3229 | * | |
3230 | * On clean-up, it is expected that the consumer daemon will | |
3231 | * unlink the shared memory files and that the session daemon | |
3232 | * will unlink the metadata file. Then, the session's directory | |
3233 | * in the shm path can be removed. | |
3234 | * | |
3235 | * Unfortunately, a flaw in the design of the sessiond's and | |
3236 | * consumerd's tear down of channels makes it impossible to | |
3237 | * determine when the sessiond _and_ the consumerd have both | |
3238 | * destroyed their representation of a channel. For one, the | |
3239 | * unlinking, close, and rmdir happen in deferred 'call_rcu' | |
3240 | * callbacks in both daemons. | |
3241 | * | |
3242 | * However, it is also impossible for the sessiond to know when | |
3243 | * the consumer daemon is done destroying its channel(s) since | |
3244 | * it occurs as a reaction to the closing of the channel's file | |
3245 | * descriptor. There is no resulting communication initiated | |
3246 | * from the consumerd to the sessiond to confirm that the | |
3247 | * operation is completed (and was successful). | |
3248 | * | |
3249 | * Until this is all fixed, the session daemon checks for the | |
3250 | * removal of the session's shm path which makes it possible | |
3251 | * to safely advertise a session as having been destroyed. | |
3252 | * | |
3253 | * Prior to this fix, it was not possible to reliably save | |
3254 | * a session making use of the --shm-path option, destroy it, | |
3255 | * and load it again. This is because the creation of the | |
3256 | * session would fail upon seeing the session's shm path | |
3257 | * already in existence. | |
3258 | * | |
3259 | * Note that none of the error paths in the check for the | |
3260 | * directory's existence return an error. This is normal | |
3261 | * as there isn't much that can be done. The session will | |
3262 | * be destroyed properly, except that we can't offer the | |
3263 | * guarantee that the same session can be re-created. | |
3264 | */ | |
3265 | current_completion_handler = &destroy_completion_handler.handler; | |
3266 | ret = lttng_strncpy(destroy_completion_handler.shm_path, | |
3267 | session->shm_path, | |
3268 | sizeof(destroy_completion_handler.shm_path)); | |
3269 | assert(!ret); | |
3270 | } | |
48a86f68 JG |
3271 | |
3272 | /* | |
3273 | * The session is destroyed. However, note that the command context | |
3274 | * still holds a reference to the session, thus delaying its destruction | |
3275 | * _at least_ up to the point when that reference is released. | |
3276 | */ | |
3277 | session_destroy(session); | |
823a1989 JG |
3278 | if (reply_context) { |
3279 | ret = session_add_destroy_notifier(session, | |
3280 | cmd_destroy_session_reply, | |
3281 | (void *) reply_context); | |
3282 | if (ret) { | |
3283 | ret = LTTNG_ERR_FATAL; | |
3284 | goto end; | |
3285 | } else { | |
3286 | *sock_fd = -1; | |
3287 | } | |
3288 | } | |
3289 | ret = LTTNG_OK; | |
3290 | end: | |
2f77fc4b DG |
3291 | return ret; |
3292 | } | |
3293 | ||
2f77fc4b DG |
3294 | /* |
3295 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
3296 | */ | |
56a37563 JG |
3297 | int cmd_register_consumer(struct ltt_session *session, |
3298 | enum lttng_domain_type domain, const char *sock_path, | |
3299 | struct consumer_data *cdata) | |
2f77fc4b DG |
3300 | { |
3301 | int ret, sock; | |
dd81b457 | 3302 | struct consumer_socket *socket = NULL; |
2f77fc4b DG |
3303 | |
3304 | assert(session); | |
3305 | assert(cdata); | |
3306 | assert(sock_path); | |
3307 | ||
3308 | switch (domain) { | |
3309 | case LTTNG_DOMAIN_KERNEL: | |
3310 | { | |
3311 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3312 | ||
3313 | assert(ksess); | |
3314 | ||
3315 | /* Can't register a consumer if there is already one */ | |
3316 | if (ksess->consumer_fds_sent != 0) { | |
f73fabfd | 3317 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
3318 | goto error; |
3319 | } | |
3320 | ||
3321 | sock = lttcomm_connect_unix_sock(sock_path); | |
3322 | if (sock < 0) { | |
f73fabfd | 3323 | ret = LTTNG_ERR_CONNECT_FAIL; |
2f77fc4b DG |
3324 | goto error; |
3325 | } | |
4ce514c4 | 3326 | cdata->cmd_sock = sock; |
2f77fc4b | 3327 | |
4ce514c4 | 3328 | socket = consumer_allocate_socket(&cdata->cmd_sock); |
2f77fc4b | 3329 | if (socket == NULL) { |
f66c074c DG |
3330 | ret = close(sock); |
3331 | if (ret < 0) { | |
3332 | PERROR("close register consumer"); | |
3333 | } | |
4ce514c4 | 3334 | cdata->cmd_sock = -1; |
f73fabfd | 3335 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
3336 | goto error; |
3337 | } | |
3338 | ||
3339 | socket->lock = zmalloc(sizeof(pthread_mutex_t)); | |
3340 | if (socket->lock == NULL) { | |
3341 | PERROR("zmalloc pthread mutex"); | |
f73fabfd | 3342 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
3343 | goto error; |
3344 | } | |
3345 | pthread_mutex_init(socket->lock, NULL); | |
3346 | socket->registered = 1; | |
3347 | ||
3348 | rcu_read_lock(); | |
3349 | consumer_add_socket(socket, ksess->consumer); | |
3350 | rcu_read_unlock(); | |
3351 | ||
3352 | pthread_mutex_lock(&cdata->pid_mutex); | |
3353 | cdata->pid = -1; | |
3354 | pthread_mutex_unlock(&cdata->pid_mutex); | |
3355 | ||
3356 | break; | |
3357 | } | |
3358 | default: | |
3359 | /* TODO: Userspace tracing */ | |
f73fabfd | 3360 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3361 | goto error; |
3362 | } | |
3363 | ||
dd81b457 | 3364 | return LTTNG_OK; |
2f77fc4b DG |
3365 | |
3366 | error: | |
dd81b457 DG |
3367 | if (socket) { |
3368 | consumer_destroy_socket(socket); | |
3369 | } | |
2f77fc4b DG |
3370 | return ret; |
3371 | } | |
3372 | ||
3373 | /* | |
3374 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
3375 | */ | |
3376 | ssize_t cmd_list_domains(struct ltt_session *session, | |
3377 | struct lttng_domain **domains) | |
3378 | { | |
3379 | int ret, index = 0; | |
3380 | ssize_t nb_dom = 0; | |
fefd409b DG |
3381 | struct agent *agt; |
3382 | struct lttng_ht_iter iter; | |
2f77fc4b DG |
3383 | |
3384 | if (session->kernel_session != NULL) { | |
3385 | DBG3("Listing domains found kernel domain"); | |
3386 | nb_dom++; | |
3387 | } | |
3388 | ||
3389 | if (session->ust_session != NULL) { | |
3390 | DBG3("Listing domains found UST global domain"); | |
3391 | nb_dom++; | |
3c6a091f | 3392 | |
e0a74f01 | 3393 | rcu_read_lock(); |
fefd409b DG |
3394 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
3395 | agt, node.node) { | |
3396 | if (agt->being_used) { | |
3397 | nb_dom++; | |
3398 | } | |
3c6a091f | 3399 | } |
e0a74f01 | 3400 | rcu_read_unlock(); |
2f77fc4b DG |
3401 | } |
3402 | ||
fa64dfb4 JG |
3403 | if (!nb_dom) { |
3404 | goto end; | |
3405 | } | |
3406 | ||
2f77fc4b DG |
3407 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
3408 | if (*domains == NULL) { | |
f73fabfd | 3409 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
3410 | goto error; |
3411 | } | |
3412 | ||
3413 | if (session->kernel_session != NULL) { | |
3414 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
b5edb9e8 PP |
3415 | |
3416 | /* Kernel session buffer type is always GLOBAL */ | |
3417 | (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL; | |
3418 | ||
2f77fc4b DG |
3419 | index++; |
3420 | } | |
3421 | ||
3422 | if (session->ust_session != NULL) { | |
3423 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
88c5f0d8 | 3424 | (*domains)[index].buf_type = session->ust_session->buffer_type; |
2f77fc4b | 3425 | index++; |
3c6a091f | 3426 | |
e0a74f01 | 3427 | rcu_read_lock(); |
fefd409b DG |
3428 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
3429 | agt, node.node) { | |
3430 | if (agt->being_used) { | |
3431 | (*domains)[index].type = agt->domain; | |
3432 | (*domains)[index].buf_type = session->ust_session->buffer_type; | |
3433 | index++; | |
3434 | } | |
3c6a091f | 3435 | } |
e0a74f01 | 3436 | rcu_read_unlock(); |
2f77fc4b | 3437 | } |
fa64dfb4 | 3438 | end: |
2f77fc4b DG |
3439 | return nb_dom; |
3440 | ||
3441 | error: | |
f73fabfd DG |
3442 | /* Return negative value to differentiate return code */ |
3443 | return -ret; | |
2f77fc4b DG |
3444 | } |
3445 | ||
3446 | ||
3447 | /* | |
3448 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
3449 | */ | |
56a37563 JG |
3450 | ssize_t cmd_list_channels(enum lttng_domain_type domain, |
3451 | struct ltt_session *session, struct lttng_channel **channels) | |
2f77fc4b | 3452 | { |
53e367f9 | 3453 | ssize_t nb_chan = 0, payload_size = 0, ret; |
2f77fc4b DG |
3454 | |
3455 | switch (domain) { | |
3456 | case LTTNG_DOMAIN_KERNEL: | |
3457 | if (session->kernel_session != NULL) { | |
3458 | nb_chan = session->kernel_session->channel_count; | |
3459 | } | |
3460 | DBG3("Number of kernel channels %zd", nb_chan); | |
c7d620a2 | 3461 | if (nb_chan <= 0) { |
53e367f9 JG |
3462 | ret = -LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
3463 | goto end; | |
c7d620a2 | 3464 | } |
2f77fc4b DG |
3465 | break; |
3466 | case LTTNG_DOMAIN_UST: | |
3467 | if (session->ust_session != NULL) { | |
7ffc31a2 | 3468 | rcu_read_lock(); |
2f77fc4b | 3469 | nb_chan = lttng_ht_get_count( |
7ffc31a2 JG |
3470 | session->ust_session->domain_global.channels); |
3471 | rcu_read_unlock(); | |
2f77fc4b DG |
3472 | } |
3473 | DBG3("Number of UST global channels %zd", nb_chan); | |
ade7ce52 | 3474 | if (nb_chan < 0) { |
53e367f9 JG |
3475 | ret = -LTTNG_ERR_UST_CHAN_NOT_FOUND; |
3476 | goto end; | |
c7d620a2 | 3477 | } |
2f77fc4b DG |
3478 | break; |
3479 | default: | |
53e367f9 JG |
3480 | ret = -LTTNG_ERR_UND; |
3481 | goto end; | |
2f77fc4b DG |
3482 | } |
3483 | ||
3484 | if (nb_chan > 0) { | |
53e367f9 | 3485 | const size_t channel_size = sizeof(struct lttng_channel) + |
cf0bcb51 JG |
3486 | sizeof(struct lttng_channel_extended); |
3487 | struct lttng_channel_extended *channel_exts; | |
53e367f9 JG |
3488 | |
3489 | payload_size = nb_chan * channel_size; | |
3490 | *channels = zmalloc(payload_size); | |
2f77fc4b | 3491 | if (*channels == NULL) { |
53e367f9 JG |
3492 | ret = -LTTNG_ERR_FATAL; |
3493 | goto end; | |
2f77fc4b DG |
3494 | } |
3495 | ||
53e367f9 JG |
3496 | channel_exts = ((void *) *channels) + |
3497 | (nb_chan * sizeof(struct lttng_channel)); | |
d449df4a MD |
3498 | ret = list_lttng_channels(domain, session, *channels, channel_exts); |
3499 | if (ret != LTTNG_OK) { | |
3500 | free(*channels); | |
3501 | *channels = NULL; | |
3502 | goto end; | |
3503 | } | |
53e367f9 JG |
3504 | } else { |
3505 | *channels = NULL; | |
2f77fc4b DG |
3506 | } |
3507 | ||
53e367f9 JG |
3508 | ret = payload_size; |
3509 | end: | |
3510 | return ret; | |
2f77fc4b DG |
3511 | } |
3512 | ||
3513 | /* | |
3514 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3515 | */ | |
56a37563 JG |
3516 | ssize_t cmd_list_events(enum lttng_domain_type domain, |
3517 | struct ltt_session *session, char *channel_name, | |
b4e3ceb9 | 3518 | struct lttng_event **events, size_t *total_size) |
2f77fc4b DG |
3519 | { |
3520 | int ret = 0; | |
3521 | ssize_t nb_event = 0; | |
3522 | ||
3523 | switch (domain) { | |
3524 | case LTTNG_DOMAIN_KERNEL: | |
3525 | if (session->kernel_session != NULL) { | |
3526 | nb_event = list_lttng_kernel_events(channel_name, | |
b4e3ceb9 PP |
3527 | session->kernel_session, events, |
3528 | total_size); | |
2f77fc4b DG |
3529 | } |
3530 | break; | |
3531 | case LTTNG_DOMAIN_UST: | |
3532 | { | |
3533 | if (session->ust_session != NULL) { | |
3534 | nb_event = list_lttng_ust_global_events(channel_name, | |
b4e3ceb9 PP |
3535 | &session->ust_session->domain_global, events, |
3536 | total_size); | |
2f77fc4b DG |
3537 | } |
3538 | break; | |
3539 | } | |
5cdb6027 | 3540 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 3541 | case LTTNG_DOMAIN_JUL: |
0e115563 | 3542 | case LTTNG_DOMAIN_PYTHON: |
3c6a091f | 3543 | if (session->ust_session) { |
fefd409b DG |
3544 | struct lttng_ht_iter iter; |
3545 | struct agent *agt; | |
3546 | ||
b11feea5 | 3547 | rcu_read_lock(); |
fefd409b DG |
3548 | cds_lfht_for_each_entry(session->ust_session->agents->ht, |
3549 | &iter.iter, agt, node.node) { | |
1dfd9906 JG |
3550 | if (agt->domain == domain) { |
3551 | nb_event = list_lttng_agent_events( | |
b4e3ceb9 PP |
3552 | agt, events, |
3553 | total_size); | |
1dfd9906 JG |
3554 | break; |
3555 | } | |
fefd409b | 3556 | } |
b11feea5 | 3557 | rcu_read_unlock(); |
3c6a091f DG |
3558 | } |
3559 | break; | |
2f77fc4b | 3560 | default: |
f73fabfd | 3561 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3562 | goto error; |
3563 | } | |
3564 | ||
f73fabfd | 3565 | return nb_event; |
2f77fc4b DG |
3566 | |
3567 | error: | |
f73fabfd DG |
3568 | /* Return negative value to differentiate return code */ |
3569 | return -ret; | |
2f77fc4b DG |
3570 | } |
3571 | ||
3572 | /* | |
3573 | * Using the session list, filled a lttng_session array to send back to the | |
3574 | * client for session listing. | |
3575 | * | |
3576 | * The session list lock MUST be acquired before calling this function. Use | |
3577 | * session_lock_list() and session_unlock_list(). | |
3578 | */ | |
5feee503 JG |
3579 | void cmd_list_lttng_sessions(struct lttng_session *sessions, |
3580 | size_t session_count, uid_t uid, gid_t gid) | |
2f77fc4b DG |
3581 | { |
3582 | int ret; | |
3583 | unsigned int i = 0; | |
3584 | struct ltt_session *session; | |
3585 | struct ltt_session_list *list = session_get_list(); | |
5feee503 JG |
3586 | struct lttng_session_extended *extended = |
3587 | (typeof(extended)) (&sessions[session_count]); | |
2f77fc4b DG |
3588 | |
3589 | DBG("Getting all available session for UID %d GID %d", | |
3590 | uid, gid); | |
3591 | /* | |
3592 | * Iterate over session list and append data after the control struct in | |
3593 | * the buffer. | |
3594 | */ | |
3595 | cds_list_for_each_entry(session, &list->head, list) { | |
48a86f68 JG |
3596 | if (!session_get(session)) { |
3597 | continue; | |
3598 | } | |
2f77fc4b DG |
3599 | /* |
3600 | * Only list the sessions the user can control. | |
3601 | */ | |
48a86f68 JG |
3602 | if (!session_access_ok(session, uid, gid) || |
3603 | session->destroyed) { | |
3604 | session_put(session); | |
2f77fc4b DG |
3605 | continue; |
3606 | } | |
3607 | ||
3608 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3609 | struct ltt_ust_session *usess = session->ust_session; | |
3610 | ||
3611 | if (session->consumer->type == CONSUMER_DST_NET || | |
3612 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
3613 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
3614 | ret = build_network_session_path(sessions[i].path, | |
dec56f6c | 3615 | sizeof(sessions[i].path), session); |
2f77fc4b | 3616 | } else { |
dec56f6c | 3617 | ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s", |
366a9222 | 3618 | session->consumer->dst.session_root_path); |
2f77fc4b DG |
3619 | } |
3620 | if (ret < 0) { | |
3621 | PERROR("snprintf session path"); | |
48a86f68 | 3622 | session_put(session); |
2f77fc4b DG |
3623 | continue; |
3624 | } | |
3625 | ||
3626 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
3627 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
8382cf6f | 3628 | sessions[i].enabled = session->active; |
2cbf8fed | 3629 | sessions[i].snapshot_mode = session->snapshot_mode; |
8960e9cd | 3630 | sessions[i].live_timer_interval = session->live_timer; |
5feee503 JG |
3631 | extended[i].creation_time.value = (uint64_t) session->creation_time; |
3632 | extended[i].creation_time.is_set = 1; | |
2f77fc4b | 3633 | i++; |
48a86f68 | 3634 | session_put(session); |
2f77fc4b DG |
3635 | } |
3636 | } | |
3637 | ||
806e2684 | 3638 | /* |
6d805429 | 3639 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
d3f14b8a | 3640 | * ready for trace analysis (or any kind of reader) or else 1 for pending data. |
806e2684 | 3641 | */ |
6d805429 | 3642 | int cmd_data_pending(struct ltt_session *session) |
806e2684 DG |
3643 | { |
3644 | int ret; | |
3645 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3646 | struct ltt_ust_session *usess = session->ust_session; | |
3647 | ||
3648 | assert(session); | |
3649 | ||
5c408ad8 JD |
3650 | DBG("Data pending for session %s", session->name); |
3651 | ||
806e2684 | 3652 | /* Session MUST be stopped to ask for data availability. */ |
8382cf6f | 3653 | if (session->active) { |
806e2684 DG |
3654 | ret = LTTNG_ERR_SESSION_STARTED; |
3655 | goto error; | |
3a89d11a DG |
3656 | } else { |
3657 | /* | |
3658 | * If stopped, just make sure we've started before else the above call | |
3659 | * will always send that there is data pending. | |
3660 | * | |
3661 | * The consumer assumes that when the data pending command is received, | |
3662 | * the trace has been started before or else no output data is written | |
3663 | * by the streams which is a condition for data pending. So, this is | |
3664 | * *VERY* important that we don't ask the consumer before a start | |
3665 | * trace. | |
3666 | */ | |
8382cf6f | 3667 | if (!session->has_been_started) { |
3a89d11a DG |
3668 | ret = 0; |
3669 | goto error; | |
3670 | } | |
806e2684 DG |
3671 | } |
3672 | ||
82528808 JG |
3673 | /* A rotation is still pending, we have to wait. */ |
3674 | if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) { | |
5c408ad8 JD |
3675 | DBG("Rotate still pending for session %s", session->name); |
3676 | ret = 1; | |
3677 | goto error; | |
3678 | } | |
3679 | ||
806e2684 | 3680 | if (ksess && ksess->consumer) { |
6d805429 DG |
3681 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
3682 | if (ret == 1) { | |
806e2684 DG |
3683 | /* Data is still being extracted for the kernel. */ |
3684 | goto error; | |
3685 | } | |
3686 | } | |
3687 | ||
3688 | if (usess && usess->consumer) { | |
6d805429 DG |
3689 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
3690 | if (ret == 1) { | |
806e2684 DG |
3691 | /* Data is still being extracted for the kernel. */ |
3692 | goto error; | |
3693 | } | |
3694 | } | |
3695 | ||
3696 | /* Data is ready to be read by a viewer */ | |
6d805429 | 3697 | ret = 0; |
806e2684 DG |
3698 | |
3699 | error: | |
3700 | return ret; | |
3701 | } | |
3702 | ||
6dc3064a DG |
3703 | /* |
3704 | * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library. | |
3705 | * | |
3706 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3707 | */ | |
3708 | int cmd_snapshot_add_output(struct ltt_session *session, | |
3709 | struct lttng_snapshot_output *output, uint32_t *id) | |
3710 | { | |
3711 | int ret; | |
3712 | struct snapshot_output *new_output; | |
3713 | ||
3714 | assert(session); | |
3715 | assert(output); | |
3716 | ||
3717 | DBG("Cmd snapshot add output for session %s", session->name); | |
3718 | ||
3719 | /* | |
903ef685 | 3720 | * Can't create an output if the session is not set in no-output mode. |
6dc3064a DG |
3721 | */ |
3722 | if (session->output_traces) { | |
903ef685 | 3723 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3724 | goto error; |
3725 | } | |
3726 | ||
8954c04a JG |
3727 | if (session->has_non_mmap_channel) { |
3728 | ret = LTTNG_ERR_SNAPSHOT_UNSUPPORTED; | |
3729 | goto error; | |
3730 | } | |
3731 | ||
6dc3064a DG |
3732 | /* Only one output is allowed until we have the "tee" feature. */ |
3733 | if (session->snapshot.nb_output == 1) { | |
3734 | ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST; | |
3735 | goto error; | |
3736 | } | |
3737 | ||
3738 | new_output = snapshot_output_alloc(); | |
3739 | if (!new_output) { | |
3740 | ret = LTTNG_ERR_NOMEM; | |
3741 | goto error; | |
3742 | } | |
3743 | ||
5feee503 | 3744 | ret = snapshot_output_init(session, output->max_size, output->name, |
6dc3064a DG |
3745 | output->ctrl_url, output->data_url, session->consumer, new_output, |
3746 | &session->snapshot); | |
3747 | if (ret < 0) { | |
3748 | if (ret == -ENOMEM) { | |
3749 | ret = LTTNG_ERR_NOMEM; | |
3750 | } else { | |
3751 | ret = LTTNG_ERR_INVALID; | |
3752 | } | |
3753 | goto free_error; | |
3754 | } | |
3755 | ||
6dc3064a DG |
3756 | rcu_read_lock(); |
3757 | snapshot_add_output(&session->snapshot, new_output); | |
3758 | if (id) { | |
3759 | *id = new_output->id; | |
3760 | } | |
3761 | rcu_read_unlock(); | |
3762 | ||
3763 | return LTTNG_OK; | |
3764 | ||
3765 | free_error: | |
3766 | snapshot_output_destroy(new_output); | |
3767 | error: | |
3768 | return ret; | |
3769 | } | |
3770 | ||
3771 | /* | |
3772 | * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl. | |
3773 | * | |
3774 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3775 | */ | |
3776 | int cmd_snapshot_del_output(struct ltt_session *session, | |
3777 | struct lttng_snapshot_output *output) | |
3778 | { | |
3779 | int ret; | |
eb240553 | 3780 | struct snapshot_output *sout = NULL; |
6dc3064a DG |
3781 | |
3782 | assert(session); | |
3783 | assert(output); | |
3784 | ||
6dc3064a DG |
3785 | rcu_read_lock(); |
3786 | ||
3787 | /* | |
d3f14b8a MD |
3788 | * Permission denied to create an output if the session is not |
3789 | * set in no output mode. | |
6dc3064a DG |
3790 | */ |
3791 | if (session->output_traces) { | |
903ef685 | 3792 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3793 | goto error; |
3794 | } | |
3795 | ||
eb240553 DG |
3796 | if (output->id) { |
3797 | DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id, | |
3798 | session->name); | |
3799 | sout = snapshot_find_output_by_id(output->id, &session->snapshot); | |
3800 | } else if (*output->name != '\0') { | |
3801 | DBG("Cmd snapshot del output name %s for session %s", output->name, | |
3802 | session->name); | |
3803 | sout = snapshot_find_output_by_name(output->name, &session->snapshot); | |
3804 | } | |
6dc3064a DG |
3805 | if (!sout) { |
3806 | ret = LTTNG_ERR_INVALID; | |
3807 | goto error; | |
3808 | } | |
3809 | ||
3810 | snapshot_delete_output(&session->snapshot, sout); | |
3811 | snapshot_output_destroy(sout); | |
3812 | ret = LTTNG_OK; | |
3813 | ||
3814 | error: | |
3815 | rcu_read_unlock(); | |
3816 | return ret; | |
3817 | } | |
3818 | ||
3819 | /* | |
3820 | * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl. | |
3821 | * | |
3822 | * If no output is available, outputs is untouched and 0 is returned. | |
3823 | * | |
3824 | * Return the size of the newly allocated outputs or a negative LTTNG_ERR code. | |
3825 | */ | |
3826 | ssize_t cmd_snapshot_list_outputs(struct ltt_session *session, | |
3827 | struct lttng_snapshot_output **outputs) | |
3828 | { | |
3829 | int ret, idx = 0; | |
b223ca94 | 3830 | struct lttng_snapshot_output *list = NULL; |
6dc3064a DG |
3831 | struct lttng_ht_iter iter; |
3832 | struct snapshot_output *output; | |
3833 | ||
3834 | assert(session); | |
3835 | assert(outputs); | |
3836 | ||
3837 | DBG("Cmd snapshot list outputs for session %s", session->name); | |
3838 | ||
3839 | /* | |
d3f14b8a MD |
3840 | * Permission denied to create an output if the session is not |
3841 | * set in no output mode. | |
6dc3064a DG |
3842 | */ |
3843 | if (session->output_traces) { | |
903ef685 JG |
3844 | ret = -LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
3845 | goto end; | |
6dc3064a DG |
3846 | } |
3847 | ||
3848 | if (session->snapshot.nb_output == 0) { | |
3849 | ret = 0; | |
903ef685 | 3850 | goto end; |
6dc3064a DG |
3851 | } |
3852 | ||
3853 | list = zmalloc(session->snapshot.nb_output * sizeof(*list)); | |
3854 | if (!list) { | |
b223ca94 | 3855 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3856 | goto end; |
6dc3064a DG |
3857 | } |
3858 | ||
3859 | /* Copy list from session to the new list object. */ | |
b223ca94 | 3860 | rcu_read_lock(); |
6dc3064a DG |
3861 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter, |
3862 | output, node.node) { | |
3863 | assert(output->consumer); | |
3864 | list[idx].id = output->id; | |
3865 | list[idx].max_size = output->max_size; | |
6ce22875 MD |
3866 | if (lttng_strncpy(list[idx].name, output->name, |
3867 | sizeof(list[idx].name))) { | |
3868 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 3869 | goto error; |
6ce22875 | 3870 | } |
6dc3064a | 3871 | if (output->consumer->type == CONSUMER_DST_LOCAL) { |
6ce22875 | 3872 | if (lttng_strncpy(list[idx].ctrl_url, |
366a9222 | 3873 | output->consumer->dst.session_root_path, |
6ce22875 MD |
3874 | sizeof(list[idx].ctrl_url))) { |
3875 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 3876 | goto error; |
6ce22875 | 3877 | } |
6dc3064a DG |
3878 | } else { |
3879 | /* Control URI. */ | |
3880 | ret = uri_to_str_url(&output->consumer->dst.net.control, | |
3881 | list[idx].ctrl_url, sizeof(list[idx].ctrl_url)); | |
3882 | if (ret < 0) { | |
b223ca94 | 3883 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3884 | goto error; |
6dc3064a DG |
3885 | } |
3886 | ||
3887 | /* Data URI. */ | |
3888 | ret = uri_to_str_url(&output->consumer->dst.net.data, | |
3889 | list[idx].data_url, sizeof(list[idx].data_url)); | |
3890 | if (ret < 0) { | |
b223ca94 | 3891 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3892 | goto error; |
6dc3064a DG |
3893 | } |
3894 | } | |
3895 | idx++; | |
3896 | } | |
3897 | ||
3898 | *outputs = list; | |
b223ca94 JG |
3899 | list = NULL; |
3900 | ret = session->snapshot.nb_output; | |
6dc3064a | 3901 | error: |
903ef685 | 3902 | rcu_read_unlock(); |
b223ca94 | 3903 | free(list); |
903ef685 | 3904 | end: |
b223ca94 | 3905 | return ret; |
6dc3064a DG |
3906 | } |
3907 | ||
93ec662e JD |
3908 | /* |
3909 | * Check if we can regenerate the metadata for this session. | |
3910 | * Only kernel, UST per-uid and non-live sessions are supported. | |
3911 | * | |
3912 | * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise. | |
3913 | */ | |
3914 | static | |
eded6438 | 3915 | int check_regenerate_metadata_support(struct ltt_session *session) |
93ec662e JD |
3916 | { |
3917 | int ret; | |
3918 | ||
3919 | assert(session); | |
3920 | ||
3921 | if (session->live_timer != 0) { | |
3922 | ret = LTTNG_ERR_LIVE_SESSION; | |
3923 | goto end; | |
3924 | } | |
3925 | if (!session->active) { | |
3926 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
3927 | goto end; | |
3928 | } | |
3929 | if (session->ust_session) { | |
3930 | switch (session->ust_session->buffer_type) { | |
3931 | case LTTNG_BUFFER_PER_UID: | |
3932 | break; | |
3933 | case LTTNG_BUFFER_PER_PID: | |
3934 | ret = LTTNG_ERR_PER_PID_SESSION; | |
3935 | goto end; | |
3936 | default: | |
3937 | assert(0); | |
3938 | ret = LTTNG_ERR_UNK; | |
3939 | goto end; | |
3940 | } | |
3941 | } | |
3942 | if (session->consumer->type == CONSUMER_DST_NET && | |
3943 | session->consumer->relay_minor_version < 8) { | |
3944 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; | |
3945 | goto end; | |
3946 | } | |
3947 | ret = 0; | |
3948 | ||
3949 | end: | |
3950 | return ret; | |
3951 | } | |
3952 | ||
7802bae3 LL |
3953 | static |
3954 | int clear_metadata_file(int fd) | |
3955 | { | |
3956 | int ret; | |
a5df8828 | 3957 | off_t lseek_ret; |
7802bae3 | 3958 | |
a5df8828 GL |
3959 | lseek_ret = lseek(fd, 0, SEEK_SET); |
3960 | if (lseek_ret < 0) { | |
7802bae3 | 3961 | PERROR("lseek"); |
a5df8828 | 3962 | ret = -1; |
7802bae3 LL |
3963 | goto end; |
3964 | } | |
3965 | ||
3966 | ret = ftruncate(fd, 0); | |
3967 | if (ret < 0) { | |
3968 | PERROR("ftruncate"); | |
3969 | goto end; | |
3970 | } | |
3971 | ||
3972 | end: | |
3973 | return ret; | |
3974 | } | |
3975 | ||
93ec662e | 3976 | static |
eded6438 | 3977 | int ust_regenerate_metadata(struct ltt_ust_session *usess) |
93ec662e JD |
3978 | { |
3979 | int ret = 0; | |
3980 | struct buffer_reg_uid *uid_reg = NULL; | |
3981 | struct buffer_reg_session *session_reg = NULL; | |
3982 | ||
3983 | rcu_read_lock(); | |
3984 | cds_list_for_each_entry(uid_reg, &usess->buffer_reg_uid_list, lnode) { | |
3985 | struct ust_registry_session *registry; | |
3986 | struct ust_registry_channel *chan; | |
3987 | struct lttng_ht_iter iter_chan; | |
3988 | ||
3989 | session_reg = uid_reg->registry; | |
3990 | registry = session_reg->reg.ust; | |
3991 | ||
3992 | pthread_mutex_lock(®istry->lock); | |
3993 | registry->metadata_len_sent = 0; | |
3994 | memset(registry->metadata, 0, registry->metadata_alloc_len); | |
3995 | registry->metadata_len = 0; | |
3996 | registry->metadata_version++; | |
7802bae3 LL |
3997 | if (registry->metadata_fd > 0) { |
3998 | /* Clear the metadata file's content. */ | |
3999 | ret = clear_metadata_file(registry->metadata_fd); | |
4000 | if (ret) { | |
4001 | pthread_mutex_unlock(®istry->lock); | |
4002 | goto end; | |
4003 | } | |
4004 | } | |
4005 | ||
93ec662e JD |
4006 | ret = ust_metadata_session_statedump(registry, NULL, |
4007 | registry->major, registry->minor); | |
4008 | if (ret) { | |
4009 | pthread_mutex_unlock(®istry->lock); | |
4010 | ERR("Failed to generate session metadata (err = %d)", | |
4011 | ret); | |
4012 | goto end; | |
4013 | } | |
4014 | cds_lfht_for_each_entry(registry->channels->ht, &iter_chan.iter, | |
4015 | chan, node.node) { | |
4016 | struct ust_registry_event *event; | |
4017 | struct lttng_ht_iter iter_event; | |
4018 | ||
4019 | ret = ust_metadata_channel_statedump(registry, chan); | |
4020 | if (ret) { | |
4021 | pthread_mutex_unlock(®istry->lock); | |
4022 | ERR("Failed to generate channel metadata " | |
4023 | "(err = %d)", ret); | |
4024 | goto end; | |
4025 | } | |
4026 | cds_lfht_for_each_entry(chan->ht->ht, &iter_event.iter, | |
4027 | event, node.node) { | |
4028 | ret = ust_metadata_event_statedump(registry, | |
4029 | chan, event); | |
4030 | if (ret) { | |
4031 | pthread_mutex_unlock(®istry->lock); | |
4032 | ERR("Failed to generate event metadata " | |
4033 | "(err = %d)", ret); | |
4034 | goto end; | |
4035 | } | |
4036 | } | |
4037 | } | |
4038 | pthread_mutex_unlock(®istry->lock); | |
4039 | } | |
4040 | ||
4041 | end: | |
4042 | rcu_read_unlock(); | |
4043 | return ret; | |
4044 | } | |
4045 | ||
4046 | /* | |
eded6438 | 4047 | * Command LTTNG_REGENERATE_METADATA from the lttng-ctl library. |
93ec662e JD |
4048 | * |
4049 | * Ask the consumer to truncate the existing metadata file(s) and | |
4050 | * then regenerate the metadata. Live and per-pid sessions are not | |
4051 | * supported and return an error. | |
4052 | * | |
4053 | * Return 0 on success or else a LTTNG_ERR code. | |
4054 | */ | |
eded6438 | 4055 | int cmd_regenerate_metadata(struct ltt_session *session) |
93ec662e JD |
4056 | { |
4057 | int ret; | |
4058 | ||
4059 | assert(session); | |
4060 | ||
eded6438 | 4061 | ret = check_regenerate_metadata_support(session); |
93ec662e JD |
4062 | if (ret) { |
4063 | goto end; | |
4064 | } | |
4065 | ||
4066 | if (session->kernel_session) { | |
eded6438 | 4067 | ret = kernctl_session_regenerate_metadata( |
93ec662e JD |
4068 | session->kernel_session->fd); |
4069 | if (ret < 0) { | |
4070 | ERR("Failed to regenerate the kernel metadata"); | |
4071 | goto end; | |
4072 | } | |
4073 | } | |
4074 | ||
4075 | if (session->ust_session) { | |
eded6438 | 4076 | ret = ust_regenerate_metadata(session->ust_session); |
93ec662e JD |
4077 | if (ret < 0) { |
4078 | ERR("Failed to regenerate the UST metadata"); | |
4079 | goto end; | |
4080 | } | |
4081 | } | |
4082 | DBG("Cmd metadata regenerate for session %s", session->name); | |
4083 | ret = LTTNG_OK; | |
4084 | ||
4085 | end: | |
4086 | return ret; | |
4087 | } | |
4088 | ||
c2561365 JD |
4089 | /* |
4090 | * Command LTTNG_REGENERATE_STATEDUMP from the lttng-ctl library. | |
4091 | * | |
4092 | * Ask the tracer to regenerate a new statedump. | |
4093 | * | |
4094 | * Return 0 on success or else a LTTNG_ERR code. | |
4095 | */ | |
4096 | int cmd_regenerate_statedump(struct ltt_session *session) | |
4097 | { | |
4098 | int ret; | |
4099 | ||
4100 | assert(session); | |
4101 | ||
4102 | if (!session->active) { | |
4103 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
4104 | goto end; | |
4105 | } | |
c2561365 JD |
4106 | |
4107 | if (session->kernel_session) { | |
4108 | ret = kernctl_session_regenerate_statedump( | |
4109 | session->kernel_session->fd); | |
4110 | /* | |
4111 | * Currently, the statedump in kernel can only fail if out | |
4112 | * of memory. | |
4113 | */ | |
4114 | if (ret < 0) { | |
4115 | if (ret == -ENOMEM) { | |
4116 | ret = LTTNG_ERR_REGEN_STATEDUMP_NOMEM; | |
4117 | } else { | |
4118 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
4119 | } | |
4120 | ERR("Failed to regenerate the kernel statedump"); | |
4121 | goto end; | |
4122 | } | |
4123 | } | |
4124 | ||
4125 | if (session->ust_session) { | |
4126 | ret = ust_app_regenerate_statedump_all(session->ust_session); | |
4127 | /* | |
4128 | * Currently, the statedump in UST always returns 0. | |
4129 | */ | |
4130 | if (ret < 0) { | |
4131 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
4132 | ERR("Failed to regenerate the UST statedump"); | |
4133 | goto end; | |
4134 | } | |
4135 | } | |
4136 | DBG("Cmd regenerate statedump for session %s", session->name); | |
4137 | ret = LTTNG_OK; | |
4138 | ||
4139 | end: | |
4140 | return ret; | |
4141 | } | |
4142 | ||
b0880ae5 JG |
4143 | int cmd_register_trigger(struct command_ctx *cmd_ctx, int sock, |
4144 | struct notification_thread_handle *notification_thread) | |
4145 | { | |
4146 | int ret; | |
4147 | size_t trigger_len; | |
4148 | ssize_t sock_recv_len; | |
4149 | struct lttng_trigger *trigger = NULL; | |
4150 | struct lttng_buffer_view view; | |
4151 | struct lttng_dynamic_buffer trigger_buffer; | |
4152 | ||
4153 | lttng_dynamic_buffer_init(&trigger_buffer); | |
4154 | trigger_len = (size_t) cmd_ctx->lsm->u.trigger.length; | |
4155 | ret = lttng_dynamic_buffer_set_size(&trigger_buffer, trigger_len); | |
4156 | if (ret) { | |
4157 | ret = LTTNG_ERR_NOMEM; | |
4158 | goto end; | |
4159 | } | |
4160 | ||
4161 | sock_recv_len = lttcomm_recv_unix_sock(sock, trigger_buffer.data, | |
4162 | trigger_len); | |
4163 | if (sock_recv_len < 0 || sock_recv_len != trigger_len) { | |
4164 | ERR("Failed to receive \"register trigger\" command payload"); | |
4165 | /* TODO: should this be a new error enum ? */ | |
4166 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
4167 | goto end; | |
4168 | } | |
4169 | ||
4170 | view = lttng_buffer_view_from_dynamic_buffer(&trigger_buffer, 0, -1); | |
4171 | if (lttng_trigger_create_from_buffer(&view, &trigger) != | |
4172 | trigger_len) { | |
4173 | ERR("Invalid trigger payload received in \"register trigger\" command"); | |
4174 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
4175 | goto end; | |
4176 | } | |
4177 | ||
4178 | ret = notification_thread_command_register_trigger(notification_thread, | |
4179 | trigger); | |
587f9fd0 JG |
4180 | /* Ownership of trigger was transferred. */ |
4181 | trigger = NULL; | |
b0880ae5 | 4182 | end: |
587f9fd0 | 4183 | lttng_trigger_destroy(trigger); |
b0880ae5 JG |
4184 | lttng_dynamic_buffer_reset(&trigger_buffer); |
4185 | return ret; | |
4186 | } | |
4187 | ||
4188 | int cmd_unregister_trigger(struct command_ctx *cmd_ctx, int sock, | |
4189 | struct notification_thread_handle *notification_thread) | |
4190 | { | |
4191 | int ret; | |
4192 | size_t trigger_len; | |
4193 | ssize_t sock_recv_len; | |
4194 | struct lttng_trigger *trigger = NULL; | |
4195 | struct lttng_buffer_view view; | |
4196 | struct lttng_dynamic_buffer trigger_buffer; | |
4197 | ||
4198 | lttng_dynamic_buffer_init(&trigger_buffer); | |
4199 | trigger_len = (size_t) cmd_ctx->lsm->u.trigger.length; | |
4200 | ret = lttng_dynamic_buffer_set_size(&trigger_buffer, trigger_len); | |
4201 | if (ret) { | |
4202 | ret = LTTNG_ERR_NOMEM; | |
4203 | goto end; | |
4204 | } | |
4205 | ||
4206 | sock_recv_len = lttcomm_recv_unix_sock(sock, trigger_buffer.data, | |
4207 | trigger_len); | |
4208 | if (sock_recv_len < 0 || sock_recv_len != trigger_len) { | |
4209 | ERR("Failed to receive \"unregister trigger\" command payload"); | |
4210 | /* TODO: should this be a new error enum ? */ | |
4211 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
4212 | goto end; | |
4213 | } | |
4214 | ||
4215 | view = lttng_buffer_view_from_dynamic_buffer(&trigger_buffer, 0, -1); | |
4216 | if (lttng_trigger_create_from_buffer(&view, &trigger) != | |
4217 | trigger_len) { | |
4218 | ERR("Invalid trigger payload received in \"unregister trigger\" command"); | |
4219 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
4220 | goto end; | |
4221 | } | |
4222 | ||
4223 | ret = notification_thread_command_unregister_trigger(notification_thread, | |
4224 | trigger); | |
4225 | end: | |
587f9fd0 | 4226 | lttng_trigger_destroy(trigger); |
b0880ae5 JG |
4227 | lttng_dynamic_buffer_reset(&trigger_buffer); |
4228 | return ret; | |
4229 | } | |
4230 | ||
6dc3064a DG |
4231 | /* |
4232 | * Send relayd sockets from snapshot output to consumer. Ignore request if the | |
4233 | * snapshot output is *not* set with a remote destination. | |
4234 | * | |
8f07cd01 | 4235 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a | 4236 | */ |
8f07cd01 | 4237 | static enum lttng_error_code set_relayd_for_snapshot( |
61ace1d3 | 4238 | struct consumer_output *output, |
65ff8ea3 | 4239 | const struct ltt_session *session) |
6dc3064a | 4240 | { |
8f07cd01 | 4241 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
4242 | struct lttng_ht_iter iter; |
4243 | struct consumer_socket *socket; | |
b2c25d00 | 4244 | LTTNG_OPTIONAL(uint64_t) current_chunk_id = {}; |
6ef36453 | 4245 | const char *base_path; |
6dc3064a | 4246 | |
61ace1d3 | 4247 | assert(output); |
6dc3064a DG |
4248 | assert(session); |
4249 | ||
4250 | DBG2("Set relayd object from snapshot output"); | |
4251 | ||
b2c25d00 | 4252 | if (session->current_trace_chunk) { |
61ace1d3 JG |
4253 | enum lttng_trace_chunk_status chunk_status = |
4254 | lttng_trace_chunk_get_id( | |
4255 | session->current_trace_chunk, | |
4256 | ¤t_chunk_id.value); | |
b2c25d00 | 4257 | |
61ace1d3 | 4258 | if (chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK) { |
b2c25d00 JG |
4259 | current_chunk_id.is_set = true; |
4260 | } else { | |
4261 | ERR("Failed to get current trace chunk id"); | |
4262 | status = LTTNG_ERR_UNK; | |
4263 | goto error; | |
4264 | } | |
4265 | } | |
4266 | ||
6dc3064a | 4267 | /* Ignore if snapshot consumer output is not network. */ |
61ace1d3 | 4268 | if (output->type != CONSUMER_DST_NET) { |
6dc3064a DG |
4269 | goto error; |
4270 | } | |
4271 | ||
6ef36453 MD |
4272 | /* |
4273 | * The snapshot record URI base path overrides the session | |
4274 | * base path. | |
4275 | */ | |
4276 | if (output->dst.net.control.subdir[0] != '\0') { | |
4277 | base_path = output->dst.net.control.subdir; | |
4278 | } else { | |
4279 | base_path = session->base_path; | |
4280 | } | |
4281 | ||
6dc3064a DG |
4282 | /* |
4283 | * For each consumer socket, create and send the relayd object of the | |
4284 | * snapshot output. | |
4285 | */ | |
4286 | rcu_read_lock(); | |
61ace1d3 | 4287 | cds_lfht_for_each_entry(output->socks->ht, &iter.iter, |
5eecee74 | 4288 | socket, node.node) { |
ecd0f96d | 4289 | pthread_mutex_lock(socket->lock); |
8f07cd01 | 4290 | status = send_consumer_relayd_sockets(0, session->id, |
61ace1d3 | 4291 | output, socket, |
d3e2ba59 | 4292 | session->name, session->hostname, |
6ef36453 | 4293 | base_path, |
b2c25d00 | 4294 | session->live_timer, |
0fb564b1 | 4295 | current_chunk_id.is_set ? ¤t_chunk_id.value : NULL, |
55ce50b6 MD |
4296 | session->creation_time, |
4297 | session->name_contains_creation_time); | |
ecd0f96d | 4298 | pthread_mutex_unlock(socket->lock); |
8f07cd01 | 4299 | if (status != LTTNG_OK) { |
6dc3064a DG |
4300 | rcu_read_unlock(); |
4301 | goto error; | |
4302 | } | |
4303 | } | |
4304 | rcu_read_unlock(); | |
4305 | ||
4306 | error: | |
8f07cd01 | 4307 | return status; |
6dc3064a DG |
4308 | } |
4309 | ||
4310 | /* | |
4311 | * Record a kernel snapshot. | |
4312 | * | |
fac41e72 | 4313 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a | 4314 | */ |
65ff8ea3 JG |
4315 | static enum lttng_error_code record_kernel_snapshot( |
4316 | struct ltt_kernel_session *ksess, | |
61ace1d3 | 4317 | const struct consumer_output *output, |
65ff8ea3 | 4318 | const struct ltt_session *session, |
d07ceecd | 4319 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a | 4320 | { |
8f07cd01 | 4321 | enum lttng_error_code status; |
6dc3064a DG |
4322 | |
4323 | assert(ksess); | |
4324 | assert(output); | |
4325 | assert(session); | |
4326 | ||
61ace1d3 JG |
4327 | status = kernel_snapshot_record( |
4328 | ksess, output, wait, nb_packets_per_stream); | |
8f07cd01 | 4329 | return status; |
6dc3064a DG |
4330 | } |
4331 | ||
4332 | /* | |
4333 | * Record a UST snapshot. | |
4334 | * | |
8f07cd01 | 4335 | * Returns LTTNG_OK on success or a LTTNG_ERR error code. |
6dc3064a | 4336 | */ |
8f07cd01 | 4337 | static enum lttng_error_code record_ust_snapshot(struct ltt_ust_session *usess, |
61ace1d3 JG |
4338 | const struct consumer_output *output, |
4339 | const struct ltt_session *session, | |
4340 | int wait, uint64_t nb_packets_per_stream) | |
6dc3064a | 4341 | { |
8f07cd01 | 4342 | enum lttng_error_code status; |
6dc3064a DG |
4343 | |
4344 | assert(usess); | |
4345 | assert(output); | |
4346 | assert(session); | |
4347 | ||
61ace1d3 JG |
4348 | status = ust_app_snapshot_record( |
4349 | usess, output, wait, nb_packets_per_stream); | |
8f07cd01 | 4350 | return status; |
6dc3064a DG |
4351 | } |
4352 | ||
d07ceecd | 4353 | static |
65ff8ea3 JG |
4354 | uint64_t get_session_size_one_more_packet_per_stream( |
4355 | const struct ltt_session *session, uint64_t cur_nr_packets) | |
68808f4e | 4356 | { |
d07ceecd | 4357 | uint64_t tot_size = 0; |
68808f4e DG |
4358 | |
4359 | if (session->kernel_session) { | |
4360 | struct ltt_kernel_channel *chan; | |
65ff8ea3 JG |
4361 | const struct ltt_kernel_session *ksess = |
4362 | session->kernel_session; | |
68808f4e | 4363 | |
68808f4e | 4364 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
d07ceecd MD |
4365 | if (cur_nr_packets >= chan->channel->attr.num_subbuf) { |
4366 | /* | |
4367 | * Don't take channel into account if we | |
4368 | * already grab all its packets. | |
4369 | */ | |
4370 | continue; | |
68808f4e | 4371 | } |
d07ceecd MD |
4372 | tot_size += chan->channel->attr.subbuf_size |
4373 | * chan->stream_count; | |
68808f4e DG |
4374 | } |
4375 | } | |
4376 | ||
4377 | if (session->ust_session) { | |
65ff8ea3 | 4378 | const struct ltt_ust_session *usess = session->ust_session; |
68808f4e | 4379 | |
d07ceecd MD |
4380 | tot_size += ust_app_get_size_one_more_packet_per_stream(usess, |
4381 | cur_nr_packets); | |
68808f4e DG |
4382 | } |
4383 | ||
d07ceecd | 4384 | return tot_size; |
68808f4e DG |
4385 | } |
4386 | ||
5c786ded | 4387 | /* |
d07ceecd MD |
4388 | * Calculate the number of packets we can grab from each stream that |
4389 | * fits within the overall snapshot max size. | |
4390 | * | |
4391 | * Returns -1 on error, 0 means infinite number of packets, else > 0 is | |
4392 | * the number of packets per stream. | |
4393 | * | |
4394 | * TODO: this approach is not perfect: we consider the worse case | |
4395 | * (packet filling the sub-buffers) as an upper bound, but we could do | |
4396 | * better if we do this calculation while we actually grab the packet | |
4397 | * content: we would know how much padding we don't actually store into | |
4398 | * the file. | |
4399 | * | |
4400 | * This algorithm is currently bounded by the number of packets per | |
4401 | * stream. | |
4402 | * | |
4403 | * Since we call this algorithm before actually grabbing the data, it's | |
4404 | * an approximation: for instance, applications could appear/disappear | |
4405 | * in between this call and actually grabbing data. | |
5c786ded | 4406 | */ |
d07ceecd | 4407 | static |
65ff8ea3 JG |
4408 | int64_t get_session_nb_packets_per_stream(const struct ltt_session *session, |
4409 | uint64_t max_size) | |
5c786ded | 4410 | { |
d07ceecd MD |
4411 | int64_t size_left; |
4412 | uint64_t cur_nb_packets = 0; | |
5c786ded | 4413 | |
d07ceecd MD |
4414 | if (!max_size) { |
4415 | return 0; /* Infinite */ | |
5c786ded JD |
4416 | } |
4417 | ||
d07ceecd MD |
4418 | size_left = max_size; |
4419 | for (;;) { | |
4420 | uint64_t one_more_packet_tot_size; | |
5c786ded | 4421 | |
65ff8ea3 JG |
4422 | one_more_packet_tot_size = get_session_size_one_more_packet_per_stream( |
4423 | session, cur_nb_packets); | |
d07ceecd MD |
4424 | if (!one_more_packet_tot_size) { |
4425 | /* We are already grabbing all packets. */ | |
4426 | break; | |
4427 | } | |
4428 | size_left -= one_more_packet_tot_size; | |
4429 | if (size_left < 0) { | |
4430 | break; | |
4431 | } | |
4432 | cur_nb_packets++; | |
5c786ded | 4433 | } |
d07ceecd MD |
4434 | if (!cur_nb_packets) { |
4435 | /* Not enough room to grab one packet of each stream, error. */ | |
4436 | return -1; | |
4437 | } | |
4438 | return cur_nb_packets; | |
5c786ded JD |
4439 | } |
4440 | ||
65ff8ea3 | 4441 | static |
e5148e25 | 4442 | enum lttng_error_code snapshot_record(struct ltt_session *session, |
65ff8ea3 JG |
4443 | const struct snapshot_output *snapshot_output, int wait) |
4444 | { | |
4445 | int64_t nb_packets_per_stream; | |
e5148e25 | 4446 | char snapshot_chunk_name[LTTNG_NAME_MAX]; |
61ace1d3 JG |
4447 | int ret; |
4448 | enum lttng_error_code ret_code = LTTNG_OK; | |
e5148e25 | 4449 | struct lttng_trace_chunk *snapshot_trace_chunk; |
61ace1d3 JG |
4450 | struct consumer_output *original_ust_consumer_output = NULL; |
4451 | struct consumer_output *original_kernel_consumer_output = NULL; | |
4452 | struct consumer_output *snapshot_ust_consumer_output = NULL; | |
4453 | struct consumer_output *snapshot_kernel_consumer_output = NULL; | |
e5148e25 | 4454 | |
61ace1d3 | 4455 | ret = snprintf(snapshot_chunk_name, sizeof(snapshot_chunk_name), |
e5148e25 JG |
4456 | "%s-%s-%" PRIu64, |
4457 | snapshot_output->name, | |
4458 | snapshot_output->datetime, | |
4459 | snapshot_output->nb_snapshot); | |
61ace1d3 | 4460 | if (ret < 0 || ret >= sizeof(snapshot_chunk_name)) { |
e5148e25 | 4461 | ERR("Failed to format snapshot name"); |
61ace1d3 JG |
4462 | ret_code = LTTNG_ERR_INVALID; |
4463 | goto error; | |
e5148e25 JG |
4464 | } |
4465 | DBG("Recording snapshot \"%s\" for session \"%s\" with chunk name \"%s\"", | |
4466 | snapshot_output->name, session->name, | |
4467 | snapshot_chunk_name); | |
61ace1d3 JG |
4468 | if (!session->kernel_session && !session->ust_session) { |
4469 | ERR("Failed to record snapshot as no channels exist"); | |
4470 | ret_code = LTTNG_ERR_NO_CHANNEL; | |
4471 | goto error; | |
4472 | } | |
4473 | ||
4474 | if (session->kernel_session) { | |
4475 | original_kernel_consumer_output = | |
4476 | session->kernel_session->consumer; | |
4477 | snapshot_kernel_consumer_output = | |
4478 | consumer_copy_output(snapshot_output->consumer); | |
1819b04a MD |
4479 | strcpy(snapshot_kernel_consumer_output->chunk_path, |
4480 | snapshot_chunk_name); | |
61ace1d3 JG |
4481 | ret = consumer_copy_sockets(snapshot_kernel_consumer_output, |
4482 | original_kernel_consumer_output); | |
4483 | if (ret < 0) { | |
4484 | ERR("Failed to copy consumer sockets from snapshot output configuration"); | |
4485 | ret_code = LTTNG_ERR_NOMEM; | |
4486 | goto error; | |
4487 | } | |
4488 | ret_code = set_relayd_for_snapshot( | |
4489 | snapshot_kernel_consumer_output, session); | |
4490 | if (ret_code != LTTNG_OK) { | |
4491 | ERR("Failed to setup relay daemon for kernel tracer snapshot"); | |
4492 | goto error; | |
4493 | } | |
4494 | session->kernel_session->consumer = | |
4495 | snapshot_kernel_consumer_output; | |
4496 | } | |
4497 | if (session->ust_session) { | |
4498 | original_ust_consumer_output = session->ust_session->consumer; | |
4499 | snapshot_ust_consumer_output = | |
4500 | consumer_copy_output(snapshot_output->consumer); | |
1819b04a MD |
4501 | strcpy(snapshot_ust_consumer_output->chunk_path, |
4502 | snapshot_chunk_name); | |
61ace1d3 JG |
4503 | ret = consumer_copy_sockets(snapshot_ust_consumer_output, |
4504 | original_ust_consumer_output); | |
4505 | if (ret < 0) { | |
4506 | ERR("Failed to copy consumer sockets from snapshot output configuration"); | |
4507 | ret_code = LTTNG_ERR_NOMEM; | |
4508 | goto error; | |
4509 | } | |
4510 | ret_code = set_relayd_for_snapshot( | |
4511 | snapshot_ust_consumer_output, session); | |
4512 | if (ret_code != LTTNG_OK) { | |
4513 | ERR("Failed to setup relay daemon for userspace tracer snapshot"); | |
4514 | goto error; | |
4515 | } | |
4516 | session->ust_session->consumer = | |
4517 | snapshot_ust_consumer_output; | |
4518 | } | |
4519 | ||
e5148e25 | 4520 | snapshot_trace_chunk = session_create_new_trace_chunk(session, |
61ace1d3 JG |
4521 | snapshot_kernel_consumer_output ?: |
4522 | snapshot_ust_consumer_output, | |
4523 | consumer_output_get_base_path( | |
4524 | snapshot_output->consumer), | |
e5148e25 JG |
4525 | snapshot_chunk_name); |
4526 | if (!snapshot_trace_chunk) { | |
61ace1d3 JG |
4527 | ERR("Failed to create temporary trace chunk to record a snapshot of session \"%s\"", |
4528 | session->name); | |
4529 | ret_code = LTTNG_ERR_CREATE_DIR_FAIL; | |
4530 | goto error; | |
e5148e25 JG |
4531 | } |
4532 | assert(!session->current_trace_chunk); | |
4533 | ret = session_set_trace_chunk(session, snapshot_trace_chunk, NULL); | |
4534 | lttng_trace_chunk_put(snapshot_trace_chunk); | |
4535 | snapshot_trace_chunk = NULL; | |
4536 | if (ret) { | |
61ace1d3 JG |
4537 | ERR("Failed to set temporary trace chunk to record a snapshot of session \"%s\"", |
4538 | session->name); | |
4539 | ret_code = LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER; | |
4540 | goto error; | |
e5148e25 | 4541 | } |
65ff8ea3 JG |
4542 | |
4543 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
4544 | snapshot_output->max_size); | |
4545 | if (nb_packets_per_stream < 0) { | |
61ace1d3 JG |
4546 | ret_code = LTTNG_ERR_MAX_SIZE_INVALID; |
4547 | goto error; | |
65ff8ea3 JG |
4548 | } |
4549 | ||
4550 | if (session->kernel_session) { | |
61ace1d3 JG |
4551 | ret_code = record_kernel_snapshot(session->kernel_session, |
4552 | snapshot_kernel_consumer_output, session, | |
65ff8ea3 | 4553 | wait, nb_packets_per_stream); |
61ace1d3 JG |
4554 | if (ret_code != LTTNG_OK) { |
4555 | goto error; | |
65ff8ea3 JG |
4556 | } |
4557 | } | |
4558 | ||
4559 | if (session->ust_session) { | |
61ace1d3 JG |
4560 | ret_code = record_ust_snapshot(session->ust_session, |
4561 | snapshot_ust_consumer_output, session, | |
65ff8ea3 | 4562 | wait, nb_packets_per_stream); |
61ace1d3 JG |
4563 | if (ret_code != LTTNG_OK) { |
4564 | goto error; | |
65ff8ea3 JG |
4565 | } |
4566 | } | |
e5148e25 | 4567 | |
6bbcff33 | 4568 | if (session_close_trace_chunk( |
41b23598 | 4569 | session, session->current_trace_chunk, NULL, NULL)) { |
e5148e25 JG |
4570 | /* |
4571 | * Don't goto end; make sure the chunk is closed for the session | |
4572 | * to allow future snapshots. | |
4573 | */ | |
4574 | ERR("Failed to close snapshot trace chunk of session \"%s\"", | |
4575 | session->name); | |
61ace1d3 | 4576 | ret_code = LTTNG_ERR_CLOSE_TRACE_CHUNK_FAIL_CONSUMER; |
e5148e25 JG |
4577 | } |
4578 | if (session_set_trace_chunk(session, NULL, NULL)) { | |
4579 | ERR("Failed to release the current trace chunk of session \"%s\"", | |
4580 | session->name); | |
61ace1d3 | 4581 | ret_code = LTTNG_ERR_UNK; |
e5148e25 | 4582 | } |
61ace1d3 JG |
4583 | error: |
4584 | if (original_ust_consumer_output) { | |
4585 | session->ust_session->consumer = original_ust_consumer_output; | |
4586 | } | |
4587 | if (original_kernel_consumer_output) { | |
4588 | session->kernel_session->consumer = | |
4589 | original_kernel_consumer_output; | |
4590 | } | |
4591 | consumer_output_put(snapshot_ust_consumer_output); | |
4592 | consumer_output_put(snapshot_kernel_consumer_output); | |
4593 | return ret_code; | |
65ff8ea3 JG |
4594 | } |
4595 | ||
6dc3064a DG |
4596 | /* |
4597 | * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl. | |
4598 | * | |
4599 | * The wait parameter is ignored so this call always wait for the snapshot to | |
4600 | * complete before returning. | |
4601 | * | |
4602 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
4603 | */ | |
4604 | int cmd_snapshot_record(struct ltt_session *session, | |
4605 | struct lttng_snapshot_output *output, int wait) | |
4606 | { | |
8f07cd01 JG |
4607 | enum lttng_error_code cmd_ret = LTTNG_OK; |
4608 | int ret; | |
00e1dfc4 | 4609 | unsigned int snapshot_success = 0; |
10ba83fe | 4610 | char datetime[16]; |
dade7378 | 4611 | struct snapshot_output *tmp_output = NULL; |
6dc3064a DG |
4612 | |
4613 | assert(session); | |
ba45d9f0 | 4614 | assert(output); |
6dc3064a DG |
4615 | |
4616 | DBG("Cmd snapshot record for session %s", session->name); | |
4617 | ||
10ba83fe JR |
4618 | /* Get the datetime for the snapshot output directory. */ |
4619 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", datetime, | |
4620 | sizeof(datetime)); | |
4621 | if (!ret) { | |
8f07cd01 | 4622 | cmd_ret = LTTNG_ERR_INVALID; |
10ba83fe JR |
4623 | goto error; |
4624 | } | |
4625 | ||
6dc3064a | 4626 | /* |
d3f14b8a MD |
4627 | * Permission denied to create an output if the session is not |
4628 | * set in no output mode. | |
6dc3064a DG |
4629 | */ |
4630 | if (session->output_traces) { | |
8f07cd01 | 4631 | cmd_ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
4632 | goto error; |
4633 | } | |
4634 | ||
4635 | /* The session needs to be started at least once. */ | |
8382cf6f | 4636 | if (!session->has_been_started) { |
8f07cd01 | 4637 | cmd_ret = LTTNG_ERR_START_SESSION_ONCE; |
6dc3064a DG |
4638 | goto error; |
4639 | } | |
4640 | ||
4641 | /* Use temporary output for the session. */ | |
ba45d9f0 | 4642 | if (*output->ctrl_url != '\0') { |
dade7378 JG |
4643 | tmp_output = snapshot_output_alloc(); |
4644 | if (!tmp_output) { | |
4645 | cmd_ret = LTTNG_ERR_NOMEM; | |
4646 | goto error; | |
4647 | } | |
4648 | ||
5feee503 JG |
4649 | ret = snapshot_output_init(session, output->max_size, |
4650 | output->name, | |
4651 | output->ctrl_url, output->data_url, | |
4652 | session->consumer, | |
dade7378 | 4653 | tmp_output, NULL); |
6dc3064a DG |
4654 | if (ret < 0) { |
4655 | if (ret == -ENOMEM) { | |
8f07cd01 | 4656 | cmd_ret = LTTNG_ERR_NOMEM; |
6dc3064a | 4657 | } else { |
8f07cd01 | 4658 | cmd_ret = LTTNG_ERR_INVALID; |
6dc3064a DG |
4659 | } |
4660 | goto error; | |
4661 | } | |
1bfe7328 | 4662 | /* Use the global session count for the temporary snapshot. */ |
dade7378 | 4663 | tmp_output->nb_snapshot = session->snapshot.nb_snapshot; |
10ba83fe JR |
4664 | |
4665 | /* Use the global datetime */ | |
dade7378 JG |
4666 | memcpy(tmp_output->datetime, datetime, sizeof(datetime)); |
4667 | cmd_ret = snapshot_record(session, tmp_output, wait); | |
65ff8ea3 | 4668 | if (cmd_ret != LTTNG_OK) { |
804c90a8 JR |
4669 | goto error; |
4670 | } | |
804c90a8 JR |
4671 | snapshot_success = 1; |
4672 | } else { | |
4673 | struct snapshot_output *sout; | |
4674 | struct lttng_ht_iter iter; | |
68808f4e | 4675 | |
804c90a8 JR |
4676 | rcu_read_lock(); |
4677 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
4678 | &iter.iter, sout, node.node) { | |
dade7378 JG |
4679 | struct snapshot_output output_copy; |
4680 | ||
804c90a8 | 4681 | /* |
dade7378 JG |
4682 | * Make a local copy of the output and override output |
4683 | * parameters with those provided as part of the | |
4684 | * command. | |
804c90a8 | 4685 | */ |
dade7378 | 4686 | memcpy(&output_copy, sout, sizeof(output_copy)); |
1bfe7328 | 4687 | |
804c90a8 | 4688 | if (output->max_size != (uint64_t) -1ULL) { |
dade7378 | 4689 | output_copy.max_size = output->max_size; |
6dc3064a | 4690 | } |
d07ceecd | 4691 | |
dade7378 JG |
4692 | output_copy.nb_snapshot = session->snapshot.nb_snapshot; |
4693 | memcpy(output_copy.datetime, datetime, | |
4694 | sizeof(datetime)); | |
6dc3064a | 4695 | |
804c90a8 JR |
4696 | /* Use temporary name. */ |
4697 | if (*output->name != '\0') { | |
dade7378 JG |
4698 | if (lttng_strncpy(output_copy.name, |
4699 | output->name, | |
4700 | sizeof(output_copy.name))) { | |
8f07cd01 | 4701 | cmd_ret = LTTNG_ERR_INVALID; |
cf3e357d MD |
4702 | rcu_read_unlock(); |
4703 | goto error; | |
4704 | } | |
804c90a8 | 4705 | } |
e1986656 | 4706 | |
dade7378 | 4707 | cmd_ret = snapshot_record(session, &output_copy, wait); |
65ff8ea3 JG |
4708 | if (cmd_ret != LTTNG_OK) { |
4709 | rcu_read_unlock(); | |
4710 | goto error; | |
6dc3064a | 4711 | } |
804c90a8 | 4712 | snapshot_success = 1; |
6dc3064a | 4713 | } |
804c90a8 | 4714 | rcu_read_unlock(); |
6dc3064a DG |
4715 | } |
4716 | ||
1bfe7328 DG |
4717 | if (snapshot_success) { |
4718 | session->snapshot.nb_snapshot++; | |
b67578cb | 4719 | } else { |
8f07cd01 | 4720 | cmd_ret = LTTNG_ERR_SNAPSHOT_FAIL; |
1bfe7328 DG |
4721 | } |
4722 | ||
6dc3064a | 4723 | error: |
dade7378 JG |
4724 | if (tmp_output) { |
4725 | snapshot_output_destroy(tmp_output); | |
4726 | } | |
8f07cd01 | 4727 | return cmd_ret; |
6dc3064a DG |
4728 | } |
4729 | ||
d7ba1388 MD |
4730 | /* |
4731 | * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread. | |
4732 | */ | |
4733 | int cmd_set_session_shm_path(struct ltt_session *session, | |
4734 | const char *shm_path) | |
4735 | { | |
4736 | /* Safety net */ | |
4737 | assert(session); | |
4738 | ||
4739 | /* | |
4740 | * Can only set shm path before session is started. | |
4741 | */ | |
4742 | if (session->has_been_started) { | |
4743 | return LTTNG_ERR_SESSION_STARTED; | |
4744 | } | |
4745 | ||
4746 | strncpy(session->shm_path, shm_path, | |
4747 | sizeof(session->shm_path)); | |
4748 | session->shm_path[sizeof(session->shm_path) - 1] = '\0'; | |
4749 | ||
4750 | return 0; | |
4751 | } | |
4752 | ||
5c408ad8 JD |
4753 | /* |
4754 | * Command LTTNG_ROTATE_SESSION from the lttng-ctl library. | |
4755 | * | |
4756 | * Ask the consumer to rotate the session output directory. | |
4757 | * The session lock must be held. | |
4758 | * | |
01d7dcc5 | 4759 | * Returns LTTNG_OK on success or else a negative LTTng error code. |
5c408ad8 JD |
4760 | */ |
4761 | int cmd_rotate_session(struct ltt_session *session, | |
636a3779 JG |
4762 | struct lttng_rotate_session_return *rotate_return, |
4763 | bool quiet_rotation) | |
5c408ad8 JD |
4764 | { |
4765 | int ret; | |
e5148e25 | 4766 | uint64_t ongoing_rotation_chunk_id; |
01d7dcc5 | 4767 | enum lttng_error_code cmd_ret = LTTNG_OK; |
e5148e25 JG |
4768 | struct lttng_trace_chunk *chunk_being_archived = NULL; |
4769 | struct lttng_trace_chunk *new_trace_chunk = NULL; | |
4770 | enum lttng_trace_chunk_status chunk_status; | |
5c408ad8 JD |
4771 | |
4772 | assert(session); | |
4773 | ||
4774 | if (!session->has_been_started) { | |
01d7dcc5 | 4775 | cmd_ret = LTTNG_ERR_START_SESSION_ONCE; |
d68c9a04 | 4776 | goto end; |
5c408ad8 JD |
4777 | } |
4778 | ||
aaed9f3e MD |
4779 | /* |
4780 | * Explicit rotation is not supported for live sessions. | |
4781 | * However, live sessions can perform a quiet rotation on | |
4782 | * destroy. | |
4783 | * Rotation is not supported for snapshot traces (no output). | |
4784 | */ | |
4785 | if ((!quiet_rotation && session->live_timer) || | |
4786 | !session->output_traces) { | |
01d7dcc5 | 4787 | cmd_ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE; |
d68c9a04 | 4788 | goto end; |
5c408ad8 JD |
4789 | } |
4790 | ||
e5148e25 | 4791 | /* Unsupported feature in lttng-relayd before 2.11. */ |
c3ceb5e4 | 4792 | if (!quiet_rotation && session->consumer->type == CONSUMER_DST_NET && |
5c408ad8 JD |
4793 | (session->consumer->relay_major_version == 2 && |
4794 | session->consumer->relay_minor_version < 11)) { | |
01d7dcc5 | 4795 | cmd_ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE_RELAY; |
d68c9a04 | 4796 | goto end; |
5c408ad8 JD |
4797 | } |
4798 | ||
82528808 | 4799 | if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) { |
82528808 JG |
4800 | DBG("Refusing to launch a rotation; a rotation is already in progress for session %s", |
4801 | session->name); | |
01d7dcc5 | 4802 | cmd_ret = LTTNG_ERR_ROTATION_PENDING; |
d68c9a04 | 4803 | goto end; |
5c408ad8 JD |
4804 | } |
4805 | ||
4806 | /* | |
4807 | * After a stop, we only allow one rotation to occur, the other ones are | |
4808 | * useless until a new start. | |
4809 | */ | |
4810 | if (session->rotated_after_last_stop) { | |
4811 | DBG("Session \"%s\" was already rotated after stop, refusing rotation", | |
4812 | session->name); | |
01d7dcc5 | 4813 | cmd_ret = LTTNG_ERR_ROTATION_MULTIPLE_AFTER_STOP; |
d68c9a04 | 4814 | goto end; |
5c408ad8 JD |
4815 | } |
4816 | ||
e5148e25 | 4817 | session->rotation_state = LTTNG_ROTATION_STATE_ONGOING; |
82528808 | 4818 | |
e5148e25 | 4819 | if (session->active) { |
61ace1d3 | 4820 | new_trace_chunk = session_create_new_trace_chunk(session, NULL, |
e5148e25 JG |
4821 | NULL, NULL); |
4822 | if (!new_trace_chunk) { | |
4823 | cmd_ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
4824 | goto error; | |
5c408ad8 | 4825 | } |
e5148e25 | 4826 | } |
d70d3b5f | 4827 | |
e5148e25 JG |
4828 | /* The current trace chunk becomes the chunk being archived. */ |
4829 | ret = session_set_trace_chunk(session, new_trace_chunk, | |
4830 | &chunk_being_archived); | |
4831 | if (ret) { | |
4832 | cmd_ret = LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER; | |
5feee503 JG |
4833 | goto error; |
4834 | } | |
4835 | ||
e5148e25 JG |
4836 | assert(chunk_being_archived); |
4837 | chunk_status = lttng_trace_chunk_get_id(chunk_being_archived, | |
4838 | &ongoing_rotation_chunk_id); | |
4839 | assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); | |
4840 | ||
5c408ad8 | 4841 | if (session->kernel_session) { |
01d7dcc5 JG |
4842 | cmd_ret = kernel_rotate_session(session); |
4843 | if (cmd_ret != LTTNG_OK) { | |
d70d3b5f | 4844 | goto error; |
5c408ad8 JD |
4845 | } |
4846 | } | |
4847 | if (session->ust_session) { | |
01d7dcc5 JG |
4848 | cmd_ret = ust_app_rotate_session(session); |
4849 | if (cmd_ret != LTTNG_OK) { | |
d70d3b5f | 4850 | goto error; |
5c408ad8 | 4851 | } |
82528808 | 4852 | } |
17dd1232 | 4853 | |
6bbcff33 | 4854 | ret = session_close_trace_chunk(session, chunk_being_archived, |
636a3779 JG |
4855 | quiet_rotation ? |
4856 | NULL : | |
4857 | &((enum lttng_trace_chunk_command_type){ | |
41b23598 MD |
4858 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED}), |
4859 | session->last_chunk_path); | |
e5148e25 JG |
4860 | if (ret) { |
4861 | cmd_ret = LTTNG_ERR_CLOSE_TRACE_CHUNK_FAIL_CONSUMER; | |
4862 | goto error; | |
4863 | } | |
4864 | ||
636a3779 | 4865 | session->quiet_rotation = quiet_rotation; |
82528808 JG |
4866 | ret = timer_session_rotation_pending_check_start(session, |
4867 | DEFAULT_ROTATE_PENDING_TIMER); | |
4868 | if (ret) { | |
01d7dcc5 | 4869 | cmd_ret = LTTNG_ERR_UNK; |
d70d3b5f | 4870 | goto error; |
5c408ad8 JD |
4871 | } |
4872 | ||
4873 | if (!session->active) { | |
4874 | session->rotated_after_last_stop = true; | |
4875 | } | |
4876 | ||
4877 | if (rotate_return) { | |
e5148e25 | 4878 | rotate_return->rotation_id = ongoing_rotation_chunk_id; |
5c408ad8 JD |
4879 | } |
4880 | ||
e5148e25 JG |
4881 | session->chunk_being_archived = chunk_being_archived; |
4882 | chunk_being_archived = NULL; | |
636a3779 JG |
4883 | if (!quiet_rotation) { |
4884 | ret = notification_thread_command_session_rotation_ongoing( | |
4885 | notification_thread_handle, | |
4886 | session->name, session->uid, session->gid, | |
4887 | ongoing_rotation_chunk_id); | |
4888 | if (ret != LTTNG_OK) { | |
4889 | ERR("Failed to notify notification thread that a session rotation is ongoing for session %s", | |
4890 | session->name); | |
4891 | cmd_ret = ret; | |
4892 | } | |
d70d3b5f JG |
4893 | } |
4894 | ||
82528808 | 4895 | DBG("Cmd rotate session %s, archive_id %" PRIu64 " sent", |
e5148e25 | 4896 | session->name, ongoing_rotation_chunk_id); |
5c408ad8 | 4897 | end: |
e5148e25 JG |
4898 | lttng_trace_chunk_put(new_trace_chunk); |
4899 | lttng_trace_chunk_put(chunk_being_archived); | |
01d7dcc5 | 4900 | ret = (cmd_ret == LTTNG_OK) ? cmd_ret : -((int) cmd_ret); |
5c408ad8 | 4901 | return ret; |
d70d3b5f | 4902 | error: |
d70d3b5f | 4903 | if (session_reset_rotation_state(session, |
e5148e25 | 4904 | LTTNG_ROTATION_STATE_ERROR)) { |
d70d3b5f JG |
4905 | ERR("Failed to reset rotation state of session \"%s\"", |
4906 | session->name); | |
4907 | } | |
4908 | goto end; | |
5c408ad8 JD |
4909 | } |
4910 | ||
4911 | /* | |
d68c9a04 | 4912 | * Command LTTNG_ROTATION_GET_INFO from the lttng-ctl library. |
5c408ad8 JD |
4913 | * |
4914 | * Check if the session has finished its rotation. | |
4915 | * | |
e5148e25 | 4916 | * Return LTTNG_OK on success or else an LTTNG_ERR code. |
5c408ad8 | 4917 | */ |
d68c9a04 JD |
4918 | int cmd_rotate_get_info(struct ltt_session *session, |
4919 | struct lttng_rotation_get_info_return *info_return, | |
4920 | uint64_t rotation_id) | |
5c408ad8 | 4921 | { |
e5148e25 JG |
4922 | enum lttng_error_code cmd_ret = LTTNG_OK; |
4923 | enum lttng_rotation_state rotation_state; | |
5c408ad8 | 4924 | |
d68c9a04 | 4925 | DBG("Cmd rotate_get_info session %s, rotation id %" PRIu64, session->name, |
e5148e25 | 4926 | session->most_recent_chunk_id.value); |
5c408ad8 | 4927 | |
e5148e25 JG |
4928 | if (session->chunk_being_archived) { |
4929 | enum lttng_trace_chunk_status chunk_status; | |
4930 | uint64_t chunk_id; | |
4931 | ||
4932 | chunk_status = lttng_trace_chunk_get_id( | |
4933 | session->chunk_being_archived, | |
4934 | &chunk_id); | |
4935 | assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); | |
4936 | ||
4937 | rotation_state = rotation_id == chunk_id ? | |
4938 | LTTNG_ROTATION_STATE_ONGOING : | |
4939 | LTTNG_ROTATION_STATE_EXPIRED; | |
4940 | } else { | |
4941 | if (session->last_archived_chunk_id.is_set && | |
4942 | rotation_id != session->last_archived_chunk_id.value) { | |
4943 | rotation_state = LTTNG_ROTATION_STATE_EXPIRED; | |
4944 | } else { | |
4945 | rotation_state = session->rotation_state; | |
4946 | } | |
5c408ad8 JD |
4947 | } |
4948 | ||
e5148e25 JG |
4949 | switch (rotation_state) { |
4950 | case LTTNG_ROTATION_STATE_NO_ROTATION: | |
4951 | DBG("Reporting that no rotation has occured within the lifetime of session \"%s\"", | |
4952 | session->name); | |
4953 | goto end; | |
4954 | case LTTNG_ROTATION_STATE_EXPIRED: | |
4955 | DBG("Reporting that the rotation state of rotation id %" PRIu64 " of session \"%s\" has expired", | |
4956 | rotation_id, session->name); | |
4957 | break; | |
d68c9a04 | 4958 | case LTTNG_ROTATION_STATE_ONGOING: |
e5148e25 | 4959 | DBG("Reporting that rotation id %" PRIu64 " of session \"%s\" is still pending", |
d68c9a04 JD |
4960 | rotation_id, session->name); |
4961 | break; | |
4962 | case LTTNG_ROTATION_STATE_COMPLETED: | |
dd73d57b | 4963 | { |
e5148e25 JG |
4964 | int fmt_ret; |
4965 | char *chunk_path; | |
dd73d57b JG |
4966 | char *current_tracing_path_reply; |
4967 | size_t current_tracing_path_reply_len; | |
4968 | ||
e5148e25 JG |
4969 | DBG("Reporting that rotation id %" PRIu64 " of session \"%s\" is completed", |
4970 | rotation_id, session->name); | |
4971 | ||
dd73d57b JG |
4972 | switch (session_get_consumer_destination_type(session)) { |
4973 | case CONSUMER_DST_LOCAL: | |
4974 | current_tracing_path_reply = | |
4975 | info_return->location.local.absolute_path; | |
4976 | current_tracing_path_reply_len = | |
4977 | sizeof(info_return->location.local.absolute_path); | |
4978 | info_return->location_type = | |
05f8afa9 | 4979 | (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_LOCAL; |
41b23598 MD |
4980 | fmt_ret = asprintf(&chunk_path, |
4981 | "%s/" DEFAULT_ARCHIVED_TRACE_CHUNKS_DIRECTORY "/%s", | |
4982 | session_get_base_path(session), | |
4983 | session->last_archived_chunk_name); | |
4984 | if (fmt_ret == -1) { | |
4985 | PERROR("Failed to format the path of the last archived trace chunk"); | |
4986 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; | |
4987 | cmd_ret = LTTNG_ERR_UNK; | |
4988 | goto end; | |
4989 | } | |
dd73d57b JG |
4990 | break; |
4991 | case CONSUMER_DST_NET: | |
4992 | current_tracing_path_reply = | |
4993 | info_return->location.relay.relative_path; | |
4994 | current_tracing_path_reply_len = | |
4995 | sizeof(info_return->location.relay.relative_path); | |
4996 | /* Currently the only supported relay protocol. */ | |
4997 | info_return->location.relay.protocol = | |
05f8afa9 | 4998 | (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_RELAY_PROTOCOL_TYPE_TCP; |
dd73d57b | 4999 | |
e5148e25 | 5000 | fmt_ret = lttng_strncpy(info_return->location.relay.host, |
dd73d57b JG |
5001 | session_get_net_consumer_hostname(session), |
5002 | sizeof(info_return->location.relay.host)); | |
e5148e25 JG |
5003 | if (fmt_ret) { |
5004 | ERR("Failed to copy host name to rotate_get_info reply"); | |
dd73d57b | 5005 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; |
e5148e25 | 5006 | cmd_ret = LTTNG_ERR_SET_URL; |
dd73d57b JG |
5007 | goto end; |
5008 | } | |
5009 | ||
5010 | session_get_net_consumer_ports(session, | |
5011 | &info_return->location.relay.ports.control, | |
5012 | &info_return->location.relay.ports.data); | |
5013 | info_return->location_type = | |
05f8afa9 | 5014 | (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_RELAY; |
41b23598 MD |
5015 | chunk_path = strdup(session->last_chunk_path); |
5016 | if (!chunk_path) { | |
5017 | ERR("Failed to allocate the path of the last archived trace chunk"); | |
5018 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; | |
5019 | cmd_ret = LTTNG_ERR_UNK; | |
5020 | goto end; | |
5021 | } | |
dd73d57b JG |
5022 | break; |
5023 | default: | |
5024 | abort(); | |
5025 | } | |
e5148e25 JG |
5026 | |
5027 | fmt_ret = lttng_strncpy(current_tracing_path_reply, | |
5028 | chunk_path, current_tracing_path_reply_len); | |
5029 | free(chunk_path); | |
5030 | if (fmt_ret) { | |
5031 | ERR("Failed to copy path of the last archived trace chunk to rotate_get_info reply"); | |
d68c9a04 | 5032 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; |
e5148e25 | 5033 | cmd_ret = LTTNG_ERR_UNK; |
5c408ad8 JD |
5034 | goto end; |
5035 | } | |
dd73d57b | 5036 | |
d68c9a04 | 5037 | break; |
dd73d57b | 5038 | } |
d68c9a04 | 5039 | case LTTNG_ROTATION_STATE_ERROR: |
e5148e25 | 5040 | DBG("Reporting that an error occurred during rotation %" PRIu64 " of session \"%s\"", |
d68c9a04 JD |
5041 | rotation_id, session->name); |
5042 | break; | |
5043 | default: | |
5044 | abort(); | |
5c408ad8 JD |
5045 | } |
5046 | ||
e5148e25 | 5047 | cmd_ret = LTTNG_OK; |
5c408ad8 | 5048 | end: |
e5148e25 JG |
5049 | info_return->status = (int32_t) rotation_state; |
5050 | return cmd_ret; | |
5c408ad8 JD |
5051 | } |
5052 | ||
259c2674 JD |
5053 | /* |
5054 | * Command LTTNG_ROTATION_SET_SCHEDULE from the lttng-ctl library. | |
5055 | * | |
5056 | * Configure the automatic rotation parameters. | |
66ea93b1 JG |
5057 | * 'activate' to true means activate the rotation schedule type with 'new_value'. |
5058 | * 'activate' to false means deactivate the rotation schedule and validate that | |
5059 | * 'new_value' has the same value as the currently active value. | |
259c2674 | 5060 | * |
66ea93b1 | 5061 | * Return 0 on success or else a positive LTTNG_ERR code. |
259c2674 JD |
5062 | */ |
5063 | int cmd_rotation_set_schedule(struct ltt_session *session, | |
66ea93b1 JG |
5064 | bool activate, enum lttng_rotation_schedule_type schedule_type, |
5065 | uint64_t new_value, | |
90936dcf | 5066 | struct notification_thread_handle *notification_thread_handle) |
259c2674 JD |
5067 | { |
5068 | int ret; | |
66ea93b1 | 5069 | uint64_t *parameter_value; |
259c2674 JD |
5070 | |
5071 | assert(session); | |
5072 | ||
5073 | DBG("Cmd rotate set schedule session %s", session->name); | |
5074 | ||
5268a79b | 5075 | if (session->live_timer || !session->output_traces) { |
66ea93b1 | 5076 | DBG("Failing ROTATION_SET_SCHEDULE command as the rotation feature is not available for this session"); |
259c2674 JD |
5077 | ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE; |
5078 | goto end; | |
5079 | } | |
5080 | ||
66ea93b1 JG |
5081 | switch (schedule_type) { |
5082 | case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD: | |
5083 | parameter_value = &session->rotate_size; | |
5084 | break; | |
5085 | case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC: | |
5086 | parameter_value = &session->rotate_timer_period; | |
5087 | if (new_value >= UINT_MAX) { | |
5088 | DBG("Failing ROTATION_SET_SCHEDULE command as the value requested for a periodic rotation schedule is invalid: %" PRIu64 " > %u (UINT_MAX)", | |
5089 | new_value, UINT_MAX); | |
5090 | ret = LTTNG_ERR_INVALID; | |
5091 | goto end; | |
5092 | } | |
5093 | break; | |
5094 | default: | |
5095 | WARN("Failing ROTATION_SET_SCHEDULE command on unknown schedule type"); | |
5096 | ret = LTTNG_ERR_INVALID; | |
259c2674 | 5097 | goto end; |
66ea93b1 JG |
5098 | } |
5099 | ||
5100 | /* Improper use of the API. */ | |
5101 | if (new_value == -1ULL) { | |
5102 | WARN("Failing ROTATION_SET_SCHEDULE command as the value requested is -1"); | |
5103 | ret = LTTNG_ERR_INVALID; | |
259c2674 JD |
5104 | goto end; |
5105 | } | |
5106 | ||
66ea93b1 JG |
5107 | /* |
5108 | * As indicated in struct ltt_session's comments, a value of == 0 means | |
5109 | * this schedule rotation type is not in use. | |
5110 | * | |
5111 | * Reject the command if we were asked to activate a schedule that was | |
5112 | * already active. | |
5113 | */ | |
5114 | if (activate && *parameter_value != 0) { | |
5115 | DBG("Failing ROTATION_SET_SCHEDULE (activate) command as the schedule is already active"); | |
5116 | ret = LTTNG_ERR_ROTATION_SCHEDULE_SET; | |
90936dcf | 5117 | goto end; |
66ea93b1 JG |
5118 | } |
5119 | ||
5120 | /* | |
5121 | * Reject the command if we were asked to deactivate a schedule that was | |
5122 | * not active. | |
5123 | */ | |
5124 | if (!activate && *parameter_value == 0) { | |
5125 | DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as the schedule is already inactive"); | |
5126 | ret = LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET; | |
90936dcf JD |
5127 | goto end; |
5128 | } | |
5129 | ||
66ea93b1 JG |
5130 | /* |
5131 | * Reject the command if we were asked to deactivate a schedule that | |
5132 | * doesn't exist. | |
5133 | */ | |
5134 | if (!activate && *parameter_value != new_value) { | |
5135 | DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as an inexistant schedule was provided"); | |
5136 | ret = LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET; | |
5137 | goto end; | |
5138 | } | |
259c2674 | 5139 | |
66ea93b1 JG |
5140 | *parameter_value = activate ? new_value : 0; |
5141 | ||
5142 | switch (schedule_type) { | |
5143 | case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC: | |
5144 | if (activate && session->active) { | |
5145 | /* | |
5146 | * Only start the timer if the session is active, | |
5147 | * otherwise it will be started when the session starts. | |
5148 | */ | |
82528808 JG |
5149 | ret = timer_session_rotation_schedule_timer_start( |
5150 | session, new_value); | |
259c2674 | 5151 | if (ret) { |
66ea93b1 | 5152 | ERR("Failed to enable session rotation timer in ROTATION_SET_SCHEDULE command"); |
259c2674 JD |
5153 | ret = LTTNG_ERR_UNK; |
5154 | goto end; | |
5155 | } | |
66ea93b1 | 5156 | } else { |
82528808 JG |
5157 | ret = timer_session_rotation_schedule_timer_stop( |
5158 | session); | |
66ea93b1 JG |
5159 | if (ret) { |
5160 | ERR("Failed to disable session rotation timer in ROTATION_SET_SCHEDULE command"); | |
5161 | ret = LTTNG_ERR_UNK; | |
f3ce6946 | 5162 | goto end; |
66ea93b1 | 5163 | } |
259c2674 | 5164 | } |
66ea93b1 JG |
5165 | break; |
5166 | case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD: | |
5167 | if (activate) { | |
5168 | ret = subscribe_session_consumed_size_rotation(session, | |
5169 | new_value, notification_thread_handle); | |
90936dcf | 5170 | if (ret) { |
66ea93b1 | 5171 | ERR("Failed to enable consumed-size notification in ROTATION_SET_SCHEDULE command"); |
90936dcf JD |
5172 | ret = LTTNG_ERR_UNK; |
5173 | goto end; | |
5174 | } | |
90936dcf | 5175 | } else { |
66ea93b1 JG |
5176 | ret = unsubscribe_session_consumed_size_rotation(session, |
5177 | notification_thread_handle); | |
90936dcf | 5178 | if (ret) { |
66ea93b1 | 5179 | ERR("Failed to disable consumed-size notification in ROTATION_SET_SCHEDULE command"); |
90936dcf JD |
5180 | ret = LTTNG_ERR_UNK; |
5181 | goto end; | |
5182 | } | |
66ea93b1 | 5183 | |
90936dcf | 5184 | } |
66ea93b1 JG |
5185 | break; |
5186 | default: | |
5187 | /* Would have been caught before. */ | |
5188 | abort(); | |
90936dcf JD |
5189 | } |
5190 | ||
259c2674 JD |
5191 | ret = LTTNG_OK; |
5192 | ||
5193 | goto end; | |
5194 | ||
5195 | end: | |
5196 | return ret; | |
5197 | } | |
5198 | ||
a503e1ef JG |
5199 | /* Wait for a given path to be removed before continuing. */ |
5200 | static enum lttng_error_code wait_on_path(void *path_data) | |
5201 | { | |
5202 | const char *shm_path = path_data; | |
5203 | ||
5204 | DBG("Waiting for the shm path at %s to be removed before completing session destruction", | |
5205 | shm_path); | |
5206 | while (true) { | |
5207 | int ret; | |
5208 | struct stat st; | |
5209 | ||
5210 | ret = stat(shm_path, &st); | |
5211 | if (ret) { | |
5212 | if (errno != ENOENT) { | |
5213 | PERROR("stat() returned an error while checking for the existence of the shm path"); | |
5214 | } else { | |
5215 | DBG("shm path no longer exists, completing the destruction of session"); | |
5216 | } | |
5217 | break; | |
5218 | } else { | |
5219 | if (!S_ISDIR(st.st_mode)) { | |
5220 | ERR("The type of shm path %s returned by stat() is not a directory; aborting the wait for shm path removal", | |
5221 | shm_path); | |
5222 | break; | |
5223 | } | |
5224 | } | |
5225 | usleep(SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US); | |
5226 | } | |
5227 | return LTTNG_OK; | |
5228 | } | |
5229 | ||
5230 | /* | |
5231 | * Returns a pointer to a handler to run on completion of a command. | |
5232 | * Returns NULL if no handler has to be run for the last command executed. | |
5233 | */ | |
5234 | const struct cmd_completion_handler *cmd_pop_completion_handler(void) | |
5235 | { | |
5236 | struct cmd_completion_handler *handler = current_completion_handler; | |
5237 | ||
5238 | current_completion_handler = NULL; | |
5239 | return handler; | |
5240 | } | |
5241 | ||
2f77fc4b DG |
5242 | /* |
5243 | * Init command subsystem. | |
5244 | */ | |
5245 | void cmd_init(void) | |
5246 | { | |
5247 | /* | |
d88aee68 DG |
5248 | * Set network sequence index to 1 for streams to match a relayd |
5249 | * socket on the consumer side. | |
2f77fc4b | 5250 | */ |
d88aee68 DG |
5251 | pthread_mutex_lock(&relayd_net_seq_idx_lock); |
5252 | relayd_net_seq_idx = 1; | |
5253 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
5254 | |
5255 | DBG("Command subsystem initialized"); | |
5256 | } |