Commit | Line | Data |
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2f77fc4b DG |
1 | /* |
2 | * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com> | |
bdf64013 | 3 | * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
2f77fc4b DG |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License, version 2 only, as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
16 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | */ | |
18 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
2f77fc4b | 20 | #include <assert.h> |
6dc3064a | 21 | #include <inttypes.h> |
2f77fc4b DG |
22 | #include <urcu/list.h> |
23 | #include <urcu/uatomic.h> | |
a503e1ef | 24 | #include <sys/stat.h> |
d2956687 | 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> | |
82b69413 | 36 | #include <common/trace-chunk.h> |
3e3665b8 | 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> |
b178f53e | 45 | #include <lttng/session-internal.h> |
3c02e545 | 46 | #include <lttng/userspace-probe-internal.h> |
b178f53e | 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" | |
8e319828 | 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 | ||
3e3665b8 JG |
73 | struct cmd_destroy_session_reply_context { |
74 | int reply_sock_fd; | |
75 | bool implicit_rotation_on_destroy; | |
3285a971 JG |
76 | /* |
77 | * Indicates whether or not an error occurred while launching the | |
78 | * destruction of a session. | |
79 | */ | |
80 | enum lttng_error_code destruction_status; | |
3e3665b8 JG |
81 | }; |
82 | ||
a503e1ef JG |
83 | static enum lttng_error_code wait_on_path(void *path); |
84 | ||
85 | /* | |
86 | * Command completion handler that is used by the destroy command | |
87 | * when a session that has a non-default shm_path is being destroyed. | |
88 | * | |
89 | * See comment in cmd_destroy_session() for the rationale. | |
90 | */ | |
91 | static struct destroy_completion_handler { | |
92 | struct cmd_completion_handler handler; | |
93 | char shm_path[member_sizeof(struct ltt_session, shm_path)]; | |
94 | } destroy_completion_handler = { | |
95 | .handler = { | |
96 | .run = wait_on_path, | |
97 | .data = destroy_completion_handler.shm_path | |
98 | }, | |
99 | .shm_path = { 0 }, | |
100 | }; | |
101 | ||
102 | static struct cmd_completion_handler *current_completion_handler; | |
103 | ||
2f77fc4b DG |
104 | /* |
105 | * Used to keep a unique index for each relayd socket created where this value | |
106 | * is associated with streams on the consumer so it can match the right relayd | |
d88aee68 DG |
107 | * to send to. It must be accessed with the relayd_net_seq_idx_lock |
108 | * held. | |
2f77fc4b | 109 | */ |
d88aee68 DG |
110 | static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER; |
111 | static uint64_t relayd_net_seq_idx; | |
2f77fc4b | 112 | |
7076b56e JG |
113 | static int validate_ust_event_name(const char *); |
114 | static int cmd_enable_event_internal(struct ltt_session *session, | |
df4f5a87 | 115 | const struct lttng_domain *domain, |
7076b56e JG |
116 | char *channel_name, struct lttng_event *event, |
117 | char *filter_expression, | |
118 | struct lttng_filter_bytecode *filter, | |
119 | struct lttng_event_exclusion *exclusion, | |
120 | int wpipe); | |
121 | ||
2f77fc4b DG |
122 | /* |
123 | * Create a session path used by list_lttng_sessions for the case that the | |
124 | * session consumer is on the network. | |
125 | */ | |
126 | static int build_network_session_path(char *dst, size_t size, | |
127 | struct ltt_session *session) | |
128 | { | |
129 | int ret, kdata_port, udata_port; | |
130 | struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL; | |
131 | char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX]; | |
132 | ||
133 | assert(session); | |
134 | assert(dst); | |
135 | ||
136 | memset(tmp_urls, 0, sizeof(tmp_urls)); | |
137 | memset(tmp_uurl, 0, sizeof(tmp_uurl)); | |
138 | ||
139 | kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT; | |
140 | ||
141 | if (session->kernel_session && session->kernel_session->consumer) { | |
142 | kuri = &session->kernel_session->consumer->dst.net.control; | |
143 | kdata_port = session->kernel_session->consumer->dst.net.data.port; | |
144 | } | |
145 | ||
146 | if (session->ust_session && session->ust_session->consumer) { | |
147 | uuri = &session->ust_session->consumer->dst.net.control; | |
148 | udata_port = session->ust_session->consumer->dst.net.data.port; | |
149 | } | |
150 | ||
151 | if (uuri == NULL && kuri == NULL) { | |
152 | uri = &session->consumer->dst.net.control; | |
153 | kdata_port = session->consumer->dst.net.data.port; | |
154 | } else if (kuri && uuri) { | |
155 | ret = uri_compare(kuri, uuri); | |
156 | if (ret) { | |
157 | /* Not Equal */ | |
158 | uri = kuri; | |
159 | /* Build uuri URL string */ | |
160 | ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl)); | |
161 | if (ret < 0) { | |
162 | goto error; | |
163 | } | |
164 | } else { | |
165 | uri = kuri; | |
166 | } | |
167 | } else if (kuri && uuri == NULL) { | |
168 | uri = kuri; | |
169 | } else if (uuri && kuri == NULL) { | |
170 | uri = uuri; | |
171 | } | |
172 | ||
173 | ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls)); | |
174 | if (ret < 0) { | |
175 | goto error; | |
176 | } | |
177 | ||
9aa9f900 DG |
178 | /* |
179 | * Do we have a UST url set. If yes, this means we have both kernel and UST | |
180 | * to print. | |
181 | */ | |
9d035200 | 182 | if (*tmp_uurl != '\0') { |
2f77fc4b DG |
183 | ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]", |
184 | tmp_urls, kdata_port, tmp_uurl, udata_port); | |
185 | } else { | |
9aa9f900 | 186 | int dport; |
bef08707 | 187 | if (kuri || (!kuri && !uuri)) { |
9aa9f900 DG |
188 | dport = kdata_port; |
189 | } else { | |
190 | /* No kernel URI, use the UST port. */ | |
191 | dport = udata_port; | |
192 | } | |
193 | ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport); | |
2f77fc4b DG |
194 | } |
195 | ||
196 | error: | |
197 | return ret; | |
198 | } | |
199 | ||
fb83fe64 JD |
200 | /* |
201 | * Get run-time attributes if the session has been started (discarded events, | |
202 | * lost packets). | |
203 | */ | |
204 | static int get_kernel_runtime_stats(struct ltt_session *session, | |
205 | struct ltt_kernel_channel *kchan, uint64_t *discarded_events, | |
206 | uint64_t *lost_packets) | |
207 | { | |
208 | int ret; | |
209 | ||
210 | if (!session->has_been_started) { | |
211 | ret = 0; | |
212 | *discarded_events = 0; | |
213 | *lost_packets = 0; | |
214 | goto end; | |
215 | } | |
216 | ||
e1f3997a | 217 | ret = consumer_get_discarded_events(session->id, kchan->key, |
fb83fe64 JD |
218 | session->kernel_session->consumer, |
219 | discarded_events); | |
220 | if (ret < 0) { | |
221 | goto end; | |
222 | } | |
223 | ||
e1f3997a | 224 | ret = consumer_get_lost_packets(session->id, kchan->key, |
fb83fe64 JD |
225 | session->kernel_session->consumer, |
226 | lost_packets); | |
227 | if (ret < 0) { | |
228 | goto end; | |
229 | } | |
230 | ||
231 | end: | |
232 | return ret; | |
233 | } | |
234 | ||
235 | /* | |
236 | * Get run-time attributes if the session has been started (discarded events, | |
237 | * lost packets). | |
238 | */ | |
239 | static int get_ust_runtime_stats(struct ltt_session *session, | |
240 | struct ltt_ust_channel *uchan, uint64_t *discarded_events, | |
241 | uint64_t *lost_packets) | |
242 | { | |
243 | int ret; | |
244 | struct ltt_ust_session *usess; | |
245 | ||
a91c5803 JG |
246 | if (!discarded_events || !lost_packets) { |
247 | ret = -1; | |
248 | goto end; | |
249 | } | |
250 | ||
fb83fe64 | 251 | usess = session->ust_session; |
a905c624 JG |
252 | assert(discarded_events); |
253 | assert(lost_packets); | |
fb83fe64 JD |
254 | |
255 | if (!usess || !session->has_been_started) { | |
256 | *discarded_events = 0; | |
257 | *lost_packets = 0; | |
258 | ret = 0; | |
259 | goto end; | |
260 | } | |
261 | ||
262 | if (usess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
263 | ret = ust_app_uid_get_channel_runtime_stats(usess->id, | |
264 | &usess->buffer_reg_uid_list, | |
265 | usess->consumer, uchan->id, | |
266 | uchan->attr.overwrite, | |
267 | discarded_events, | |
268 | lost_packets); | |
269 | } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
270 | ret = ust_app_pid_get_channel_runtime_stats(usess, | |
271 | uchan, usess->consumer, | |
272 | uchan->attr.overwrite, | |
273 | discarded_events, | |
274 | lost_packets); | |
275 | if (ret < 0) { | |
276 | goto end; | |
277 | } | |
278 | *discarded_events += uchan->per_pid_closed_app_discarded; | |
279 | *lost_packets += uchan->per_pid_closed_app_lost; | |
280 | } else { | |
281 | ERR("Unsupported buffer type"); | |
967bc289 | 282 | assert(0); |
fb83fe64 JD |
283 | ret = -1; |
284 | goto end; | |
285 | } | |
286 | ||
287 | end: | |
288 | return ret; | |
289 | } | |
290 | ||
2f77fc4b DG |
291 | /* |
292 | * Fill lttng_channel array of all channels. | |
293 | */ | |
d449df4a | 294 | static ssize_t list_lttng_channels(enum lttng_domain_type domain, |
fb83fe64 | 295 | struct ltt_session *session, struct lttng_channel *channels, |
cf0bcb51 | 296 | struct lttng_channel_extended *chan_exts) |
2f77fc4b | 297 | { |
d449df4a | 298 | int i = 0, ret = 0; |
2f77fc4b DG |
299 | struct ltt_kernel_channel *kchan; |
300 | ||
301 | DBG("Listing channels for session %s", session->name); | |
302 | ||
303 | switch (domain) { | |
304 | case LTTNG_DOMAIN_KERNEL: | |
305 | /* Kernel channels */ | |
306 | if (session->kernel_session != NULL) { | |
307 | cds_list_for_each_entry(kchan, | |
308 | &session->kernel_session->channel_list.head, list) { | |
fb83fe64 | 309 | uint64_t discarded_events, lost_packets; |
cf0bcb51 JG |
310 | struct lttng_channel_extended *extended; |
311 | ||
312 | extended = (struct lttng_channel_extended *) | |
313 | kchan->channel->attr.extended.ptr; | |
fb83fe64 JD |
314 | |
315 | ret = get_kernel_runtime_stats(session, kchan, | |
316 | &discarded_events, &lost_packets); | |
317 | if (ret < 0) { | |
318 | goto end; | |
319 | } | |
2f77fc4b DG |
320 | /* Copy lttng_channel struct to array */ |
321 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
322 | channels[i].enabled = kchan->enabled; | |
fb83fe64 JD |
323 | chan_exts[i].discarded_events = |
324 | discarded_events; | |
325 | chan_exts[i].lost_packets = lost_packets; | |
cf0bcb51 JG |
326 | chan_exts[i].monitor_timer_interval = |
327 | extended->monitor_timer_interval; | |
491d1539 | 328 | chan_exts[i].blocking_timeout = 0; |
2f77fc4b DG |
329 | i++; |
330 | } | |
331 | } | |
332 | break; | |
333 | case LTTNG_DOMAIN_UST: | |
334 | { | |
335 | struct lttng_ht_iter iter; | |
336 | struct ltt_ust_channel *uchan; | |
337 | ||
e7fe706f | 338 | rcu_read_lock(); |
2f77fc4b DG |
339 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
340 | &iter.iter, uchan, node.node) { | |
a91c5803 | 341 | uint64_t discarded_events = 0, lost_packets = 0; |
fb83fe64 | 342 | |
8ee609c8 MD |
343 | if (lttng_strncpy(channels[i].name, uchan->name, |
344 | LTTNG_SYMBOL_NAME_LEN)) { | |
345 | break; | |
346 | } | |
2f77fc4b DG |
347 | channels[i].attr.overwrite = uchan->attr.overwrite; |
348 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
349 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
350 | channels[i].attr.switch_timer_interval = | |
351 | uchan->attr.switch_timer_interval; | |
352 | channels[i].attr.read_timer_interval = | |
353 | uchan->attr.read_timer_interval; | |
354 | channels[i].enabled = uchan->enabled; | |
2f785fe7 DG |
355 | channels[i].attr.tracefile_size = uchan->tracefile_size; |
356 | channels[i].attr.tracefile_count = uchan->tracefile_count; | |
5e4435a4 JG |
357 | |
358 | /* | |
359 | * Map enum lttng_ust_output to enum lttng_event_output. | |
360 | */ | |
2f77fc4b DG |
361 | switch (uchan->attr.output) { |
362 | case LTTNG_UST_MMAP: | |
2f77fc4b DG |
363 | channels[i].attr.output = LTTNG_EVENT_MMAP; |
364 | break; | |
5e4435a4 JG |
365 | default: |
366 | /* | |
367 | * LTTNG_UST_MMAP is the only supported UST | |
368 | * output mode. | |
369 | */ | |
370 | assert(0); | |
371 | break; | |
2f77fc4b | 372 | } |
fb83fe64 | 373 | |
d449df4a MD |
374 | chan_exts[i].monitor_timer_interval = |
375 | uchan->monitor_timer_interval; | |
491d1539 MD |
376 | chan_exts[i].blocking_timeout = |
377 | uchan->attr.u.s.blocking_timeout; | |
d449df4a | 378 | |
fb83fe64 JD |
379 | ret = get_ust_runtime_stats(session, uchan, |
380 | &discarded_events, &lost_packets); | |
381 | if (ret < 0) { | |
382 | break; | |
383 | } | |
384 | chan_exts[i].discarded_events = discarded_events; | |
385 | chan_exts[i].lost_packets = lost_packets; | |
2f77fc4b DG |
386 | i++; |
387 | } | |
e7fe706f | 388 | rcu_read_unlock(); |
2f77fc4b DG |
389 | break; |
390 | } | |
391 | default: | |
392 | break; | |
393 | } | |
fb83fe64 JD |
394 | |
395 | end: | |
d449df4a MD |
396 | if (ret < 0) { |
397 | return -LTTNG_ERR_FATAL; | |
398 | } else { | |
399 | return LTTNG_OK; | |
400 | } | |
2f77fc4b DG |
401 | } |
402 | ||
3c02e545 FD |
403 | static int increment_extended_len(const char *filter_expression, |
404 | struct lttng_event_exclusion *exclusion, | |
405 | const struct lttng_userspace_probe_location *probe_location, | |
406 | size_t *extended_len) | |
b4e3ceb9 | 407 | { |
3c02e545 FD |
408 | int ret = 0; |
409 | ||
b4e3ceb9 PP |
410 | *extended_len += sizeof(struct lttcomm_event_extended_header); |
411 | ||
412 | if (filter_expression) { | |
413 | *extended_len += strlen(filter_expression) + 1; | |
414 | } | |
795d57ce PP |
415 | |
416 | if (exclusion) { | |
417 | *extended_len += exclusion->count * LTTNG_SYMBOL_NAME_LEN; | |
418 | } | |
3c02e545 FD |
419 | |
420 | if (probe_location) { | |
421 | ret = lttng_userspace_probe_location_serialize(probe_location, | |
422 | NULL, NULL); | |
423 | if (ret < 0) { | |
424 | goto end; | |
425 | } | |
426 | *extended_len += ret; | |
427 | } | |
428 | ret = 0; | |
429 | end: | |
430 | return ret; | |
b4e3ceb9 PP |
431 | } |
432 | ||
3c02e545 FD |
433 | static int append_extended_info(const char *filter_expression, |
434 | struct lttng_event_exclusion *exclusion, | |
435 | struct lttng_userspace_probe_location *probe_location, | |
436 | void **extended_at) | |
b4e3ceb9 | 437 | { |
3c02e545 | 438 | int ret = 0; |
b4e3ceb9 | 439 | size_t filter_len = 0; |
795d57ce | 440 | size_t nb_exclusions = 0; |
3c02e545 FD |
441 | size_t userspace_probe_location_len = 0; |
442 | struct lttng_dynamic_buffer location_buffer; | |
443 | struct lttcomm_event_extended_header extended_header; | |
b4e3ceb9 PP |
444 | |
445 | if (filter_expression) { | |
446 | filter_len = strlen(filter_expression) + 1; | |
447 | } | |
448 | ||
795d57ce PP |
449 | if (exclusion) { |
450 | nb_exclusions = exclusion->count; | |
451 | } | |
452 | ||
3c02e545 FD |
453 | if (probe_location) { |
454 | lttng_dynamic_buffer_init(&location_buffer); | |
455 | ret = lttng_userspace_probe_location_serialize(probe_location, | |
456 | &location_buffer, NULL); | |
457 | if (ret < 0) { | |
458 | ret = -1; | |
459 | goto end; | |
460 | } | |
461 | userspace_probe_location_len = location_buffer.size; | |
462 | } | |
463 | ||
795d57ce | 464 | /* Set header fields */ |
b4e3ceb9 | 465 | extended_header.filter_len = filter_len; |
795d57ce | 466 | extended_header.nb_exclusions = nb_exclusions; |
3c02e545 | 467 | extended_header.userspace_probe_location_len = userspace_probe_location_len; |
795d57ce PP |
468 | |
469 | /* Copy header */ | |
b4e3ceb9 PP |
470 | memcpy(*extended_at, &extended_header, sizeof(extended_header)); |
471 | *extended_at += sizeof(extended_header); | |
795d57ce PP |
472 | |
473 | /* Copy filter string */ | |
474 | if (filter_expression) { | |
475 | memcpy(*extended_at, filter_expression, filter_len); | |
476 | *extended_at += filter_len; | |
477 | } | |
478 | ||
479 | /* Copy exclusion names */ | |
480 | if (exclusion) { | |
481 | size_t len = nb_exclusions * LTTNG_SYMBOL_NAME_LEN; | |
482 | ||
483 | memcpy(*extended_at, &exclusion->names, len); | |
484 | *extended_at += len; | |
485 | } | |
3c02e545 FD |
486 | |
487 | if (probe_location) { | |
488 | memcpy(*extended_at, location_buffer.data, location_buffer.size); | |
489 | *extended_at += location_buffer.size; | |
490 | lttng_dynamic_buffer_reset(&location_buffer); | |
491 | } | |
492 | ret = 0; | |
493 | end: | |
494 | return ret; | |
b4e3ceb9 PP |
495 | } |
496 | ||
3c6a091f | 497 | /* |
022d91ba | 498 | * Create a list of agent domain events. |
3c6a091f DG |
499 | * |
500 | * Return number of events in list on success or else a negative value. | |
501 | */ | |
022d91ba | 502 | static int list_lttng_agent_events(struct agent *agt, |
b4e3ceb9 | 503 | struct lttng_event **events, size_t *total_size) |
3c6a091f DG |
504 | { |
505 | int i = 0, ret = 0; | |
506 | unsigned int nb_event = 0; | |
022d91ba | 507 | struct agent_event *event; |
47e52862 | 508 | struct lttng_event *tmp_events = NULL; |
3c6a091f | 509 | struct lttng_ht_iter iter; |
b4e3ceb9 PP |
510 | size_t extended_len = 0; |
511 | void *extended_at; | |
3c6a091f | 512 | |
022d91ba | 513 | assert(agt); |
3c6a091f DG |
514 | assert(events); |
515 | ||
022d91ba | 516 | DBG3("Listing agent events"); |
3c6a091f | 517 | |
e5bbf678 | 518 | rcu_read_lock(); |
022d91ba | 519 | nb_event = lttng_ht_get_count(agt->events); |
e5bbf678 | 520 | rcu_read_unlock(); |
3c6a091f DG |
521 | if (nb_event == 0) { |
522 | ret = nb_event; | |
b4e3ceb9 | 523 | *total_size = 0; |
3c6a091f DG |
524 | goto error; |
525 | } | |
526 | ||
b4e3ceb9 PP |
527 | /* Compute required extended infos size */ |
528 | extended_len = nb_event * sizeof(struct lttcomm_event_extended_header); | |
529 | ||
530 | /* | |
531 | * This is only valid because the commands which add events are | |
532 | * processed in the same thread as the listing. | |
533 | */ | |
534 | rcu_read_lock(); | |
535 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { | |
3c02e545 | 536 | ret = increment_extended_len(event->filter_expression, NULL, NULL, |
795d57ce | 537 | &extended_len); |
3c02e545 FD |
538 | if (ret) { |
539 | DBG("Error computing the length of extended info message"); | |
540 | ret = -LTTNG_ERR_FATAL; | |
541 | goto error; | |
542 | } | |
b4e3ceb9 PP |
543 | } |
544 | rcu_read_unlock(); | |
545 | ||
546 | *total_size = nb_event * sizeof(*tmp_events) + extended_len; | |
547 | tmp_events = zmalloc(*total_size); | |
3c6a091f | 548 | if (!tmp_events) { |
022d91ba | 549 | PERROR("zmalloc agent events session"); |
3c6a091f DG |
550 | ret = -LTTNG_ERR_FATAL; |
551 | goto error; | |
552 | } | |
553 | ||
b4e3ceb9 PP |
554 | extended_at = ((uint8_t *) tmp_events) + |
555 | nb_event * sizeof(struct lttng_event); | |
556 | ||
3c6a091f | 557 | rcu_read_lock(); |
022d91ba | 558 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
3c6a091f DG |
559 | strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name)); |
560 | tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0'; | |
561 | tmp_events[i].enabled = event->enabled; | |
2106efa0 | 562 | tmp_events[i].loglevel = event->loglevel_value; |
ff94328f | 563 | tmp_events[i].loglevel_type = event->loglevel_type; |
3c6a091f | 564 | i++; |
b4e3ceb9 PP |
565 | |
566 | /* Append extended info */ | |
3c02e545 | 567 | ret = append_extended_info(event->filter_expression, NULL, NULL, |
795d57ce | 568 | &extended_at); |
3c02e545 FD |
569 | if (ret) { |
570 | DBG("Error appending extended info message"); | |
571 | ret = -LTTNG_ERR_FATAL; | |
572 | goto error; | |
573 | } | |
3c6a091f | 574 | } |
3c6a091f DG |
575 | |
576 | *events = tmp_events; | |
577 | ret = nb_event; | |
3c02e545 | 578 | assert(nb_event == i); |
3c6a091f | 579 | |
47e52862 | 580 | end: |
3c02e545 | 581 | rcu_read_unlock(); |
3c6a091f | 582 | return ret; |
47e52862 JG |
583 | error: |
584 | free(tmp_events); | |
585 | goto end; | |
3c6a091f DG |
586 | } |
587 | ||
2f77fc4b DG |
588 | /* |
589 | * Create a list of ust global domain events. | |
590 | */ | |
591 | static int list_lttng_ust_global_events(char *channel_name, | |
b4e3ceb9 PP |
592 | struct ltt_ust_domain_global *ust_global, |
593 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
594 | { |
595 | int i = 0, ret = 0; | |
596 | unsigned int nb_event = 0; | |
597 | struct lttng_ht_iter iter; | |
598 | struct lttng_ht_node_str *node; | |
599 | struct ltt_ust_channel *uchan; | |
600 | struct ltt_ust_event *uevent; | |
601 | struct lttng_event *tmp; | |
b4e3ceb9 PP |
602 | size_t extended_len = 0; |
603 | void *extended_at; | |
2f77fc4b DG |
604 | |
605 | DBG("Listing UST global events for channel %s", channel_name); | |
606 | ||
607 | rcu_read_lock(); | |
608 | ||
609 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); | |
610 | node = lttng_ht_iter_get_node_str(&iter); | |
611 | if (node == NULL) { | |
f73fabfd | 612 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
d31d3e8c | 613 | goto end; |
2f77fc4b DG |
614 | } |
615 | ||
616 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); | |
617 | ||
3c442be3 | 618 | nb_event = lttng_ht_get_count(uchan->events); |
2f77fc4b DG |
619 | if (nb_event == 0) { |
620 | ret = nb_event; | |
b4e3ceb9 | 621 | *total_size = 0; |
d31d3e8c | 622 | goto end; |
2f77fc4b DG |
623 | } |
624 | ||
625 | DBG3("Listing UST global %d events", nb_event); | |
626 | ||
b4e3ceb9 PP |
627 | /* Compute required extended infos size */ |
628 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { | |
629 | if (uevent->internal) { | |
630 | nb_event--; | |
631 | continue; | |
632 | } | |
633 | ||
3c02e545 FD |
634 | ret = increment_extended_len(uevent->filter_expression, |
635 | uevent->exclusion, NULL, &extended_len); | |
636 | if (ret) { | |
637 | DBG("Error computing the length of extended info message"); | |
638 | ret = -LTTNG_ERR_FATAL; | |
639 | goto end; | |
640 | } | |
b4e3ceb9 | 641 | } |
d31d3e8c PP |
642 | if (nb_event == 0) { |
643 | /* All events are internal, skip. */ | |
644 | ret = 0; | |
645 | *total_size = 0; | |
646 | goto end; | |
647 | } | |
b4e3ceb9 PP |
648 | |
649 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
650 | tmp = zmalloc(*total_size); | |
2f77fc4b | 651 | if (tmp == NULL) { |
b12c38df JG |
652 | ret = -LTTNG_ERR_FATAL; |
653 | goto end; | |
2f77fc4b DG |
654 | } |
655 | ||
b4e3ceb9 PP |
656 | extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event); |
657 | ||
2f77fc4b | 658 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
3c442be3 JG |
659 | if (uevent->internal) { |
660 | /* This event should remain hidden from clients */ | |
3c442be3 JG |
661 | continue; |
662 | } | |
2f77fc4b DG |
663 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
664 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
665 | tmp[i].enabled = uevent->enabled; | |
666 | ||
667 | switch (uevent->attr.instrumentation) { | |
668 | case LTTNG_UST_TRACEPOINT: | |
669 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
670 | break; | |
671 | case LTTNG_UST_PROBE: | |
672 | tmp[i].type = LTTNG_EVENT_PROBE; | |
673 | break; | |
674 | case LTTNG_UST_FUNCTION: | |
675 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
676 | break; | |
677 | } | |
678 | ||
679 | tmp[i].loglevel = uevent->attr.loglevel; | |
680 | switch (uevent->attr.loglevel_type) { | |
681 | case LTTNG_UST_LOGLEVEL_ALL: | |
682 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
683 | break; | |
684 | case LTTNG_UST_LOGLEVEL_RANGE: | |
685 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; | |
686 | break; | |
687 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
688 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; | |
689 | break; | |
690 | } | |
691 | if (uevent->filter) { | |
692 | tmp[i].filter = 1; | |
693 | } | |
4634f12e JI |
694 | if (uevent->exclusion) { |
695 | tmp[i].exclusion = 1; | |
696 | } | |
2f77fc4b | 697 | i++; |
b4e3ceb9 PP |
698 | |
699 | /* Append extended info */ | |
3c02e545 FD |
700 | ret = append_extended_info(uevent->filter_expression, |
701 | uevent->exclusion, NULL, &extended_at); | |
702 | if (ret) { | |
703 | DBG("Error appending extended info message"); | |
704 | ret = -LTTNG_ERR_FATAL; | |
705 | goto end; | |
706 | } | |
2f77fc4b DG |
707 | } |
708 | ||
709 | ret = nb_event; | |
710 | *events = tmp; | |
d31d3e8c | 711 | end: |
2f77fc4b DG |
712 | rcu_read_unlock(); |
713 | return ret; | |
714 | } | |
715 | ||
716 | /* | |
717 | * Fill lttng_event array of all kernel events in the channel. | |
718 | */ | |
719 | static int list_lttng_kernel_events(char *channel_name, | |
b4e3ceb9 PP |
720 | struct ltt_kernel_session *kernel_session, |
721 | struct lttng_event **events, size_t *total_size) | |
2f77fc4b DG |
722 | { |
723 | int i = 0, ret; | |
724 | unsigned int nb_event; | |
725 | struct ltt_kernel_event *event; | |
726 | struct ltt_kernel_channel *kchan; | |
b4e3ceb9 PP |
727 | size_t extended_len = 0; |
728 | void *extended_at; | |
2f77fc4b DG |
729 | |
730 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
731 | if (kchan == NULL) { | |
f73fabfd | 732 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
2f77fc4b DG |
733 | goto error; |
734 | } | |
735 | ||
736 | nb_event = kchan->event_count; | |
737 | ||
738 | DBG("Listing events for channel %s", kchan->channel->name); | |
739 | ||
740 | if (nb_event == 0) { | |
b4e3ceb9 | 741 | *total_size = 0; |
834978fd | 742 | *events = NULL; |
db906c12 | 743 | goto end; |
2f77fc4b DG |
744 | } |
745 | ||
b4e3ceb9 PP |
746 | /* Compute required extended infos size */ |
747 | cds_list_for_each_entry(event, &kchan->events_list.head, list) { | |
3c02e545 FD |
748 | ret = increment_extended_len(event->filter_expression, NULL, |
749 | event->userspace_probe_location, | |
795d57ce | 750 | &extended_len); |
3c02e545 FD |
751 | if (ret) { |
752 | DBG("Error computing the length of extended info message"); | |
753 | ret = -LTTNG_ERR_FATAL; | |
754 | goto error; | |
755 | } | |
b4e3ceb9 PP |
756 | } |
757 | ||
758 | *total_size = nb_event * sizeof(struct lttng_event) + extended_len; | |
759 | *events = zmalloc(*total_size); | |
2f77fc4b | 760 | if (*events == NULL) { |
3c02e545 | 761 | ret = -LTTNG_ERR_FATAL; |
2f77fc4b DG |
762 | goto error; |
763 | } | |
764 | ||
ab4aa612 | 765 | extended_at = ((void *) *events) + |
b4e3ceb9 PP |
766 | nb_event * sizeof(struct lttng_event); |
767 | ||
2f77fc4b DG |
768 | /* Kernel channels */ |
769 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
770 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
771 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
772 | (*events)[i].enabled = event->enabled; | |
00f992f2 JG |
773 | (*events)[i].filter = |
774 | (unsigned char) !!event->filter_expression; | |
2f77fc4b DG |
775 | |
776 | switch (event->event->instrumentation) { | |
777 | case LTTNG_KERNEL_TRACEPOINT: | |
778 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; | |
779 | break; | |
2f77fc4b | 780 | case LTTNG_KERNEL_KRETPROBE: |
1896972b DG |
781 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
782 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
783 | sizeof(struct lttng_kernel_kprobe)); | |
784 | break; | |
785 | case LTTNG_KERNEL_KPROBE: | |
2f77fc4b DG |
786 | (*events)[i].type = LTTNG_EVENT_PROBE; |
787 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
788 | sizeof(struct lttng_kernel_kprobe)); | |
789 | break; | |
b955b4d4 FD |
790 | case LTTNG_KERNEL_UPROBE: |
791 | (*events)[i].type = LTTNG_EVENT_USERSPACE_PROBE; | |
792 | break; | |
2f77fc4b DG |
793 | case LTTNG_KERNEL_FUNCTION: |
794 | (*events)[i].type = LTTNG_EVENT_FUNCTION; | |
795 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
796 | sizeof(struct lttng_kernel_function)); | |
797 | break; | |
798 | case LTTNG_KERNEL_NOOP: | |
799 | (*events)[i].type = LTTNG_EVENT_NOOP; | |
800 | break; | |
801 | case LTTNG_KERNEL_SYSCALL: | |
802 | (*events)[i].type = LTTNG_EVENT_SYSCALL; | |
803 | break; | |
804 | case LTTNG_KERNEL_ALL: | |
1ab8c2ad FD |
805 | /* fall-through. */ |
806 | default: | |
2f77fc4b DG |
807 | assert(0); |
808 | break; | |
809 | } | |
810 | i++; | |
b4e3ceb9 PP |
811 | |
812 | /* Append extended info */ | |
3c02e545 FD |
813 | ret = append_extended_info(event->filter_expression, NULL, |
814 | event->userspace_probe_location, &extended_at); | |
815 | if (ret) { | |
816 | DBG("Error appending extended info message"); | |
817 | ret = -LTTNG_ERR_FATAL; | |
818 | goto error; | |
819 | } | |
2f77fc4b DG |
820 | } |
821 | ||
db906c12 | 822 | end: |
2f77fc4b DG |
823 | return nb_event; |
824 | ||
825 | error: | |
f73fabfd DG |
826 | /* Negate the error code to differentiate the size from an error */ |
827 | return -ret; | |
2f77fc4b DG |
828 | } |
829 | ||
830 | /* | |
831 | * Add URI so the consumer output object. Set the correct path depending on the | |
832 | * domain adding the default trace directory. | |
833 | */ | |
b178f53e JG |
834 | static enum lttng_error_code add_uri_to_consumer( |
835 | const struct ltt_session *session, | |
836 | struct consumer_output *consumer, | |
837 | struct lttng_uri *uri, enum lttng_domain_type domain) | |
2f77fc4b | 838 | { |
b178f53e JG |
839 | int ret; |
840 | enum lttng_error_code ret_code = LTTNG_OK; | |
2f77fc4b DG |
841 | |
842 | assert(uri); | |
843 | ||
844 | if (consumer == NULL) { | |
845 | DBG("No consumer detected. Don't add URI. Stopping."); | |
b178f53e | 846 | ret_code = LTTNG_ERR_NO_CONSUMER; |
2f77fc4b DG |
847 | goto error; |
848 | } | |
849 | ||
850 | switch (domain) { | |
851 | case LTTNG_DOMAIN_KERNEL: | |
b178f53e JG |
852 | ret = lttng_strncpy(consumer->domain_subdir, |
853 | DEFAULT_KERNEL_TRACE_DIR, | |
854 | sizeof(consumer->domain_subdir)); | |
2f77fc4b DG |
855 | break; |
856 | case LTTNG_DOMAIN_UST: | |
b178f53e JG |
857 | ret = lttng_strncpy(consumer->domain_subdir, |
858 | DEFAULT_UST_TRACE_DIR, | |
859 | sizeof(consumer->domain_subdir)); | |
2f77fc4b DG |
860 | break; |
861 | default: | |
862 | /* | |
b178f53e JG |
863 | * This case is possible is we try to add the URI to the global |
864 | * tracing session consumer object which in this case there is | |
865 | * no subdir. | |
2f77fc4b | 866 | */ |
b178f53e JG |
867 | memset(consumer->domain_subdir, 0, |
868 | sizeof(consumer->domain_subdir)); | |
869 | ret = 0; | |
870 | } | |
871 | if (ret) { | |
872 | ERR("Failed to initialize consumer output domain subdirectory"); | |
873 | ret_code = LTTNG_ERR_FATAL; | |
874 | goto error; | |
2f77fc4b DG |
875 | } |
876 | ||
877 | switch (uri->dtype) { | |
878 | case LTTNG_DST_IPV4: | |
879 | case LTTNG_DST_IPV6: | |
880 | DBG2("Setting network URI to consumer"); | |
881 | ||
df75acac DG |
882 | if (consumer->type == CONSUMER_DST_NET) { |
883 | if ((uri->stype == LTTNG_STREAM_CONTROL && | |
785d2d0d DG |
884 | consumer->dst.net.control_isset) || |
885 | (uri->stype == LTTNG_STREAM_DATA && | |
886 | consumer->dst.net.data_isset)) { | |
b178f53e | 887 | ret_code = LTTNG_ERR_URL_EXIST; |
df75acac DG |
888 | goto error; |
889 | } | |
890 | } else { | |
b178f53e | 891 | memset(&consumer->dst, 0, sizeof(consumer->dst)); |
785d2d0d DG |
892 | } |
893 | ||
2f77fc4b | 894 | /* Set URI into consumer output object */ |
b178f53e | 895 | ret = consumer_set_network_uri(session, consumer, uri); |
2f77fc4b | 896 | if (ret < 0) { |
b178f53e | 897 | ret_code = -ret; |
2f77fc4b DG |
898 | goto error; |
899 | } else if (ret == 1) { | |
900 | /* | |
901 | * URI was the same in the consumer so we do not append the subdir | |
902 | * again so to not duplicate output dir. | |
903 | */ | |
b178f53e | 904 | ret_code = LTTNG_OK; |
2f77fc4b DG |
905 | goto error; |
906 | } | |
2f77fc4b DG |
907 | break; |
908 | case LTTNG_DST_PATH: | |
b178f53e JG |
909 | if (*uri->dst.path != '/' || strstr(uri->dst.path, "../")) { |
910 | ret_code = LTTNG_ERR_INVALID; | |
9ac05d92 MD |
911 | goto error; |
912 | } | |
b178f53e JG |
913 | DBG2("Setting trace directory path from URI to %s", |
914 | uri->dst.path); | |
915 | memset(&consumer->dst, 0, sizeof(consumer->dst)); | |
916 | ||
917 | ret = lttng_strncpy(consumer->dst.session_root_path, | |
918 | uri->dst.path, | |
919 | sizeof(consumer->dst.session_root_path)); | |
4df41cad JG |
920 | if (ret) { |
921 | ret_code = LTTNG_ERR_FATAL; | |
922 | goto error; | |
923 | } | |
2f77fc4b DG |
924 | consumer->type = CONSUMER_DST_LOCAL; |
925 | break; | |
926 | } | |
927 | ||
b178f53e | 928 | ret_code = LTTNG_OK; |
2f77fc4b | 929 | error: |
b178f53e | 930 | return ret_code; |
2f77fc4b DG |
931 | } |
932 | ||
933 | /* | |
934 | * Init tracing by creating trace directory and sending fds kernel consumer. | |
935 | */ | |
936 | static int init_kernel_tracing(struct ltt_kernel_session *session) | |
937 | { | |
938 | int ret = 0; | |
939 | struct lttng_ht_iter iter; | |
940 | struct consumer_socket *socket; | |
941 | ||
942 | assert(session); | |
943 | ||
e7fe706f DG |
944 | rcu_read_lock(); |
945 | ||
2f77fc4b DG |
946 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { |
947 | cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter, | |
948 | socket, node.node) { | |
2f77fc4b | 949 | pthread_mutex_lock(socket->lock); |
f50f23d9 | 950 | ret = kernel_consumer_send_session(socket, session); |
2f77fc4b DG |
951 | pthread_mutex_unlock(socket->lock); |
952 | if (ret < 0) { | |
f73fabfd | 953 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
954 | goto error; |
955 | } | |
956 | } | |
957 | } | |
958 | ||
959 | error: | |
e7fe706f | 960 | rcu_read_unlock(); |
2f77fc4b DG |
961 | return ret; |
962 | } | |
963 | ||
964 | /* | |
965 | * Create a socket to the relayd using the URI. | |
966 | * | |
967 | * On success, the relayd_sock pointer is set to the created socket. | |
9a654598 | 968 | * Else, it remains untouched and an LTTng error code is returned. |
2f77fc4b | 969 | */ |
9a654598 | 970 | static enum lttng_error_code create_connect_relayd(struct lttng_uri *uri, |
b31610f2 JD |
971 | struct lttcomm_relayd_sock **relayd_sock, |
972 | struct consumer_output *consumer) | |
2f77fc4b DG |
973 | { |
974 | int ret; | |
9a654598 | 975 | enum lttng_error_code status = LTTNG_OK; |
6151a90f | 976 | struct lttcomm_relayd_sock *rsock; |
2f77fc4b | 977 | |
6151a90f JD |
978 | rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR, |
979 | RELAYD_VERSION_COMM_MINOR); | |
980 | if (!rsock) { | |
9a654598 | 981 | status = LTTNG_ERR_FATAL; |
2f77fc4b DG |
982 | goto error; |
983 | } | |
984 | ||
ffe60014 DG |
985 | /* |
986 | * Connect to relayd so we can proceed with a session creation. This call | |
987 | * can possibly block for an arbitrary amount of time to set the health | |
988 | * state to be in poll execution. | |
989 | */ | |
990 | health_poll_entry(); | |
6151a90f | 991 | ret = relayd_connect(rsock); |
ffe60014 | 992 | health_poll_exit(); |
2f77fc4b DG |
993 | if (ret < 0) { |
994 | ERR("Unable to reach lttng-relayd"); | |
9a654598 | 995 | status = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
996 | goto free_sock; |
997 | } | |
998 | ||
999 | /* Create socket for control stream. */ | |
1000 | if (uri->stype == LTTNG_STREAM_CONTROL) { | |
1001 | DBG3("Creating relayd stream socket from URI"); | |
1002 | ||
1003 | /* Check relayd version */ | |
6151a90f | 1004 | ret = relayd_version_check(rsock); |
67d5aa28 | 1005 | if (ret == LTTNG_ERR_RELAYD_VERSION_FAIL) { |
9a654598 | 1006 | status = LTTNG_ERR_RELAYD_VERSION_FAIL; |
67d5aa28 JD |
1007 | goto close_sock; |
1008 | } else if (ret < 0) { | |
1009 | ERR("Unable to reach lttng-relayd"); | |
9a654598 | 1010 | status = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
2f77fc4b DG |
1011 | goto close_sock; |
1012 | } | |
b31610f2 JD |
1013 | consumer->relay_major_version = rsock->major; |
1014 | consumer->relay_minor_version = rsock->minor; | |
2f77fc4b DG |
1015 | } else if (uri->stype == LTTNG_STREAM_DATA) { |
1016 | DBG3("Creating relayd data socket from URI"); | |
1017 | } else { | |
1018 | /* Command is not valid */ | |
1019 | ERR("Relayd invalid stream type: %d", uri->stype); | |
9a654598 | 1020 | status = LTTNG_ERR_INVALID; |
2f77fc4b DG |
1021 | goto close_sock; |
1022 | } | |
1023 | ||
6151a90f | 1024 | *relayd_sock = rsock; |
2f77fc4b | 1025 | |
9a654598 | 1026 | return status; |
2f77fc4b DG |
1027 | |
1028 | close_sock: | |
6151a90f JD |
1029 | /* The returned value is not useful since we are on an error path. */ |
1030 | (void) relayd_close(rsock); | |
2f77fc4b | 1031 | free_sock: |
6151a90f | 1032 | free(rsock); |
2f77fc4b | 1033 | error: |
9a654598 | 1034 | return status; |
2f77fc4b DG |
1035 | } |
1036 | ||
1037 | /* | |
1038 | * Connect to the relayd using URI and send the socket to the right consumer. | |
43fade62 JG |
1039 | * |
1040 | * The consumer socket lock must be held by the caller. | |
9a654598 JG |
1041 | * |
1042 | * Returns LTTNG_OK on success or an LTTng error code on failure. | |
2f77fc4b | 1043 | */ |
9a654598 JG |
1044 | static enum lttng_error_code send_consumer_relayd_socket( |
1045 | unsigned int session_id, | |
3044f922 | 1046 | struct lttng_uri *relayd_uri, |
56a37563 | 1047 | struct consumer_output *consumer, |
d3e2ba59 | 1048 | struct consumer_socket *consumer_sock, |
fb9a95c4 | 1049 | const char *session_name, const char *hostname, |
6fa5fe7c | 1050 | const char *base_path, int session_live_timer, |
db1da059 | 1051 | const uint64_t *current_chunk_id, |
46ef2188 MD |
1052 | time_t session_creation_time, |
1053 | bool session_name_contains_creation_time) | |
2f77fc4b DG |
1054 | { |
1055 | int ret; | |
6151a90f | 1056 | struct lttcomm_relayd_sock *rsock = NULL; |
9a654598 | 1057 | enum lttng_error_code status; |
2f77fc4b | 1058 | |
ffe60014 | 1059 | /* Connect to relayd and make version check if uri is the control. */ |
9a654598 JG |
1060 | status = create_connect_relayd(relayd_uri, &rsock, consumer); |
1061 | if (status != LTTNG_OK) { | |
9e218353 | 1062 | goto relayd_comm_error; |
ffe60014 | 1063 | } |
6151a90f | 1064 | assert(rsock); |
ffe60014 | 1065 | |
2f77fc4b | 1066 | /* Set the network sequence index if not set. */ |
d88aee68 DG |
1067 | if (consumer->net_seq_index == (uint64_t) -1ULL) { |
1068 | pthread_mutex_lock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
1069 | /* |
1070 | * Increment net_seq_idx because we are about to transfer the | |
1071 | * new relayd socket to the consumer. | |
d88aee68 | 1072 | * Assign unique key so the consumer can match streams. |
2f77fc4b | 1073 | */ |
d88aee68 DG |
1074 | consumer->net_seq_index = ++relayd_net_seq_idx; |
1075 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
1076 | } |
1077 | ||
2f77fc4b | 1078 | /* Send relayd socket to consumer. */ |
6151a90f | 1079 | ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer, |
d3e2ba59 | 1080 | relayd_uri->stype, session_id, |
6fa5fe7c MD |
1081 | session_name, hostname, base_path, |
1082 | session_live_timer, current_chunk_id, | |
46ef2188 | 1083 | session_creation_time, session_name_contains_creation_time); |
2f77fc4b | 1084 | if (ret < 0) { |
9a654598 | 1085 | status = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
2f77fc4b DG |
1086 | goto close_sock; |
1087 | } | |
1088 | ||
c890b720 DG |
1089 | /* Flag that the corresponding socket was sent. */ |
1090 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { | |
ffe60014 | 1091 | consumer_sock->control_sock_sent = 1; |
c890b720 | 1092 | } else if (relayd_uri->stype == LTTNG_STREAM_DATA) { |
ffe60014 | 1093 | consumer_sock->data_sock_sent = 1; |
c890b720 DG |
1094 | } |
1095 | ||
2f77fc4b DG |
1096 | /* |
1097 | * Close socket which was dup on the consumer side. The session daemon does | |
1098 | * NOT keep track of the relayd socket(s) once transfer to the consumer. | |
1099 | */ | |
1100 | ||
1101 | close_sock: | |
9a654598 | 1102 | if (status != LTTNG_OK) { |
ffe60014 | 1103 | /* |
d9078d0c DG |
1104 | * The consumer output for this session should not be used anymore |
1105 | * since the relayd connection failed thus making any tracing or/and | |
1106 | * streaming not usable. | |
ffe60014 | 1107 | */ |
d9078d0c | 1108 | consumer->enabled = 0; |
ffe60014 | 1109 | } |
9e218353 JR |
1110 | (void) relayd_close(rsock); |
1111 | free(rsock); | |
1112 | ||
1113 | relayd_comm_error: | |
9a654598 | 1114 | return status; |
2f77fc4b DG |
1115 | } |
1116 | ||
1117 | /* | |
1118 | * Send both relayd sockets to a specific consumer and domain. This is a | |
1119 | * helper function to facilitate sending the information to the consumer for a | |
1120 | * session. | |
43fade62 JG |
1121 | * |
1122 | * The consumer socket lock must be held by the caller. | |
9a654598 JG |
1123 | * |
1124 | * Returns LTTNG_OK, or an LTTng error code on failure. | |
2f77fc4b | 1125 | */ |
9a654598 JG |
1126 | static enum lttng_error_code send_consumer_relayd_sockets( |
1127 | enum lttng_domain_type domain, | |
56a37563 | 1128 | unsigned int session_id, struct consumer_output *consumer, |
fb9a95c4 | 1129 | struct consumer_socket *sock, const char *session_name, |
6fa5fe7c | 1130 | const char *hostname, const char *base_path, int session_live_timer, |
46ef2188 MD |
1131 | const uint64_t *current_chunk_id, time_t session_creation_time, |
1132 | bool session_name_contains_creation_time) | |
2f77fc4b | 1133 | { |
9a654598 | 1134 | enum lttng_error_code status = LTTNG_OK; |
2f77fc4b | 1135 | |
2f77fc4b | 1136 | assert(consumer); |
6dc3064a | 1137 | assert(sock); |
2f77fc4b | 1138 | |
2f77fc4b | 1139 | /* Sending control relayd socket. */ |
ffe60014 | 1140 | if (!sock->control_sock_sent) { |
9a654598 | 1141 | status = send_consumer_relayd_socket(session_id, |
d3e2ba59 | 1142 | &consumer->dst.net.control, consumer, sock, |
6fa5fe7c | 1143 | session_name, hostname, base_path, session_live_timer, |
46ef2188 MD |
1144 | current_chunk_id, session_creation_time, |
1145 | session_name_contains_creation_time); | |
9a654598 | 1146 | if (status != LTTNG_OK) { |
c890b720 DG |
1147 | goto error; |
1148 | } | |
2f77fc4b DG |
1149 | } |
1150 | ||
1151 | /* Sending data relayd socket. */ | |
ffe60014 | 1152 | if (!sock->data_sock_sent) { |
9a654598 | 1153 | status = send_consumer_relayd_socket(session_id, |
d3e2ba59 | 1154 | &consumer->dst.net.data, consumer, sock, |
6fa5fe7c | 1155 | session_name, hostname, base_path, session_live_timer, |
46ef2188 MD |
1156 | current_chunk_id, session_creation_time, |
1157 | session_name_contains_creation_time); | |
9a654598 | 1158 | if (status != LTTNG_OK) { |
c890b720 DG |
1159 | goto error; |
1160 | } | |
2f77fc4b DG |
1161 | } |
1162 | ||
2f77fc4b | 1163 | error: |
9a654598 | 1164 | return status; |
2f77fc4b DG |
1165 | } |
1166 | ||
1167 | /* | |
1168 | * Setup relayd connections for a tracing session. First creates the socket to | |
1169 | * the relayd and send them to the right domain consumer. Consumer type MUST be | |
1170 | * network. | |
1171 | */ | |
ffe60014 | 1172 | int cmd_setup_relayd(struct ltt_session *session) |
2f77fc4b | 1173 | { |
f73fabfd | 1174 | int ret = LTTNG_OK; |
2f77fc4b DG |
1175 | struct ltt_ust_session *usess; |
1176 | struct ltt_kernel_session *ksess; | |
1177 | struct consumer_socket *socket; | |
1178 | struct lttng_ht_iter iter; | |
1e791a74 | 1179 | LTTNG_OPTIONAL(uint64_t) current_chunk_id = {}; |
2f77fc4b | 1180 | |
1e791a74 | 1181 | assert(session); |
2f77fc4b DG |
1182 | |
1183 | usess = session->ust_session; | |
1184 | ksess = session->kernel_session; | |
1185 | ||
785d2d0d | 1186 | DBG("Setting relayd for session %s", session->name); |
2f77fc4b | 1187 | |
aa997ea3 | 1188 | rcu_read_lock(); |
1e791a74 JG |
1189 | if (session->current_trace_chunk) { |
1190 | enum lttng_trace_chunk_status status = lttng_trace_chunk_get_id( | |
1191 | session->current_trace_chunk, ¤t_chunk_id.value); | |
1192 | ||
1193 | if (status == LTTNG_TRACE_CHUNK_STATUS_OK) { | |
1194 | current_chunk_id.is_set = true; | |
1195 | } else { | |
1196 | ERR("Failed to get current trace chunk id"); | |
1197 | ret = LTTNG_ERR_UNK; | |
1198 | goto error; | |
1199 | } | |
1200 | } | |
1201 | ||
2f77fc4b DG |
1202 | if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET |
1203 | && usess->consumer->enabled) { | |
1204 | /* For each consumer socket, send relayd sockets */ | |
1205 | cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, | |
1206 | socket, node.node) { | |
2f77fc4b | 1207 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1208 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id, |
d3e2ba59 JD |
1209 | usess->consumer, socket, |
1210 | session->name, session->hostname, | |
6fa5fe7c | 1211 | session->base_path, |
1e791a74 | 1212 | session->live_timer, |
db1da059 | 1213 | current_chunk_id.is_set ? ¤t_chunk_id.value : NULL, |
46ef2188 MD |
1214 | session->creation_time, |
1215 | session->name_contains_creation_time); | |
2f77fc4b | 1216 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1217 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1218 | goto error; |
1219 | } | |
6dc3064a DG |
1220 | /* Session is now ready for network streaming. */ |
1221 | session->net_handle = 1; | |
2f77fc4b | 1222 | } |
b31610f2 JD |
1223 | session->consumer->relay_major_version = |
1224 | usess->consumer->relay_major_version; | |
1225 | session->consumer->relay_minor_version = | |
1226 | usess->consumer->relay_minor_version; | |
2f77fc4b DG |
1227 | } |
1228 | ||
1229 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET | |
1230 | && ksess->consumer->enabled) { | |
1231 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1232 | socket, node.node) { | |
2f77fc4b | 1233 | pthread_mutex_lock(socket->lock); |
6dc3064a | 1234 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id, |
d3e2ba59 JD |
1235 | ksess->consumer, socket, |
1236 | session->name, session->hostname, | |
6fa5fe7c | 1237 | session->base_path, |
1e791a74 | 1238 | session->live_timer, |
db1da059 | 1239 | current_chunk_id.is_set ? ¤t_chunk_id.value : NULL, |
46ef2188 MD |
1240 | session->creation_time, |
1241 | session->name_contains_creation_time); | |
2f77fc4b | 1242 | pthread_mutex_unlock(socket->lock); |
f73fabfd | 1243 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1244 | goto error; |
1245 | } | |
6dc3064a DG |
1246 | /* Session is now ready for network streaming. */ |
1247 | session->net_handle = 1; | |
2f77fc4b | 1248 | } |
b31610f2 JD |
1249 | session->consumer->relay_major_version = |
1250 | ksess->consumer->relay_major_version; | |
1251 | session->consumer->relay_minor_version = | |
1252 | ksess->consumer->relay_minor_version; | |
2f77fc4b DG |
1253 | } |
1254 | ||
1255 | error: | |
e7fe706f | 1256 | rcu_read_unlock(); |
2f77fc4b DG |
1257 | return ret; |
1258 | } | |
1259 | ||
9b6c7ec5 DG |
1260 | /* |
1261 | * Start a kernel session by opening all necessary streams. | |
1262 | */ | |
4dbe1875 | 1263 | int start_kernel_session(struct ltt_kernel_session *ksess) |
9b6c7ec5 DG |
1264 | { |
1265 | int ret; | |
1266 | struct ltt_kernel_channel *kchan; | |
1267 | ||
1268 | /* Open kernel metadata */ | |
07b86b52 | 1269 | if (ksess->metadata == NULL && ksess->output_traces) { |
9b6c7ec5 DG |
1270 | ret = kernel_open_metadata(ksess); |
1271 | if (ret < 0) { | |
1272 | ret = LTTNG_ERR_KERN_META_FAIL; | |
1273 | goto error; | |
1274 | } | |
1275 | } | |
1276 | ||
1277 | /* Open kernel metadata stream */ | |
07b86b52 | 1278 | if (ksess->metadata && ksess->metadata_stream_fd < 0) { |
9b6c7ec5 DG |
1279 | ret = kernel_open_metadata_stream(ksess); |
1280 | if (ret < 0) { | |
1281 | ERR("Kernel create metadata stream failed"); | |
1282 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1283 | goto error; | |
1284 | } | |
1285 | } | |
1286 | ||
1287 | /* For each channel */ | |
1288 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
1289 | if (kchan->stream_count == 0) { | |
1290 | ret = kernel_open_channel_stream(kchan); | |
1291 | if (ret < 0) { | |
1292 | ret = LTTNG_ERR_KERN_STREAM_FAIL; | |
1293 | goto error; | |
1294 | } | |
1295 | /* Update the stream global counter */ | |
1296 | ksess->stream_count_global += ret; | |
1297 | } | |
1298 | } | |
1299 | ||
1300 | /* Setup kernel consumer socket and send fds to it */ | |
1301 | ret = init_kernel_tracing(ksess); | |
e43c41c5 | 1302 | if (ret != 0) { |
9b6c7ec5 DG |
1303 | ret = LTTNG_ERR_KERN_START_FAIL; |
1304 | goto error; | |
1305 | } | |
1306 | ||
1307 | /* This start the kernel tracing */ | |
1308 | ret = kernel_start_session(ksess); | |
1309 | if (ret < 0) { | |
1310 | ret = LTTNG_ERR_KERN_START_FAIL; | |
1311 | goto error; | |
1312 | } | |
1313 | ||
1314 | /* Quiescent wait after starting trace */ | |
7d268848 | 1315 | kernel_wait_quiescent(); |
9b6c7ec5 | 1316 | |
14fb1ebe | 1317 | ksess->active = 1; |
9b6c7ec5 DG |
1318 | |
1319 | ret = LTTNG_OK; | |
1320 | ||
1321 | error: | |
1322 | return ret; | |
1323 | } | |
1324 | ||
4dbe1875 MD |
1325 | int stop_kernel_session(struct ltt_kernel_session *ksess) |
1326 | { | |
1327 | struct ltt_kernel_channel *kchan; | |
1328 | bool error_occurred = false; | |
1329 | int ret; | |
1330 | ||
1331 | if (!ksess || !ksess->active) { | |
1332 | return LTTNG_OK; | |
1333 | } | |
1334 | DBG("Stopping kernel tracing"); | |
1335 | ||
1336 | ret = kernel_stop_session(ksess); | |
1337 | if (ret < 0) { | |
1338 | ret = LTTNG_ERR_KERN_STOP_FAIL; | |
1339 | goto error; | |
1340 | } | |
1341 | ||
1342 | kernel_wait_quiescent(); | |
1343 | ||
1344 | /* Flush metadata after stopping (if exists) */ | |
1345 | if (ksess->metadata_stream_fd >= 0) { | |
1346 | ret = kernel_metadata_flush_buffer(ksess->metadata_stream_fd); | |
1347 | if (ret < 0) { | |
1348 | ERR("Kernel metadata flush failed"); | |
1349 | error_occurred = true; | |
1350 | } | |
1351 | } | |
1352 | ||
1353 | /* Flush all buffers after stopping */ | |
1354 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { | |
1355 | ret = kernel_flush_buffer(kchan); | |
1356 | if (ret < 0) { | |
1357 | ERR("Kernel flush buffer error"); | |
1358 | error_occurred = true; | |
1359 | } | |
1360 | } | |
1361 | ||
1362 | ksess->active = 0; | |
1363 | if (error_occurred) { | |
1364 | ret = LTTNG_ERR_UNK; | |
1365 | } else { | |
1366 | ret = LTTNG_OK; | |
1367 | } | |
1368 | error: | |
1369 | return ret; | |
1370 | } | |
1371 | ||
2f77fc4b DG |
1372 | /* |
1373 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. | |
1374 | */ | |
56a37563 JG |
1375 | int cmd_disable_channel(struct ltt_session *session, |
1376 | enum lttng_domain_type domain, char *channel_name) | |
2f77fc4b DG |
1377 | { |
1378 | int ret; | |
1379 | struct ltt_ust_session *usess; | |
1380 | ||
1381 | usess = session->ust_session; | |
1382 | ||
2223c96f DG |
1383 | rcu_read_lock(); |
1384 | ||
2f77fc4b DG |
1385 | switch (domain) { |
1386 | case LTTNG_DOMAIN_KERNEL: | |
1387 | { | |
1388 | ret = channel_kernel_disable(session->kernel_session, | |
1389 | channel_name); | |
f73fabfd | 1390 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1391 | goto error; |
1392 | } | |
1393 | ||
7d268848 | 1394 | kernel_wait_quiescent(); |
2f77fc4b DG |
1395 | break; |
1396 | } | |
1397 | case LTTNG_DOMAIN_UST: | |
1398 | { | |
1399 | struct ltt_ust_channel *uchan; | |
1400 | struct lttng_ht *chan_ht; | |
1401 | ||
1402 | chan_ht = usess->domain_global.channels; | |
1403 | ||
1404 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
1405 | if (uchan == NULL) { | |
f73fabfd | 1406 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
2f77fc4b DG |
1407 | goto error; |
1408 | } | |
1409 | ||
7972aab2 | 1410 | ret = channel_ust_disable(usess, uchan); |
f73fabfd | 1411 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1412 | goto error; |
1413 | } | |
1414 | break; | |
1415 | } | |
2f77fc4b | 1416 | default: |
f73fabfd | 1417 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1418 | goto error; |
1419 | } | |
1420 | ||
f73fabfd | 1421 | ret = LTTNG_OK; |
2f77fc4b DG |
1422 | |
1423 | error: | |
2223c96f | 1424 | rcu_read_unlock(); |
2f77fc4b DG |
1425 | return ret; |
1426 | } | |
1427 | ||
ccf10263 MD |
1428 | /* |
1429 | * Command LTTNG_TRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1430 | * |
1431 | * Called with session lock held. | |
ccf10263 | 1432 | */ |
56a37563 JG |
1433 | int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1434 | int pid) | |
ccf10263 MD |
1435 | { |
1436 | int ret; | |
1437 | ||
1438 | rcu_read_lock(); | |
1439 | ||
1440 | switch (domain) { | |
1441 | case LTTNG_DOMAIN_KERNEL: | |
1442 | { | |
1443 | struct ltt_kernel_session *ksess; | |
1444 | ||
1445 | ksess = session->kernel_session; | |
1446 | ||
1447 | ret = kernel_track_pid(ksess, pid); | |
1448 | if (ret != LTTNG_OK) { | |
1449 | goto error; | |
1450 | } | |
1451 | ||
7d268848 | 1452 | kernel_wait_quiescent(); |
ccf10263 MD |
1453 | break; |
1454 | } | |
ccf10263 | 1455 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1456 | { |
1457 | struct ltt_ust_session *usess; | |
1458 | ||
1459 | usess = session->ust_session; | |
1460 | ||
1461 | ret = trace_ust_track_pid(usess, pid); | |
1462 | if (ret != LTTNG_OK) { | |
1463 | goto error; | |
1464 | } | |
1465 | break; | |
1466 | } | |
ccf10263 MD |
1467 | default: |
1468 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1469 | goto error; | |
1470 | } | |
1471 | ||
1472 | ret = LTTNG_OK; | |
1473 | ||
1474 | error: | |
1475 | rcu_read_unlock(); | |
1476 | return ret; | |
1477 | } | |
1478 | ||
1479 | /* | |
1480 | * Command LTTNG_UNTRACK_PID processed by the client thread. | |
a9ad0c8f MD |
1481 | * |
1482 | * Called with session lock held. | |
ccf10263 | 1483 | */ |
56a37563 JG |
1484 | int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain, |
1485 | int pid) | |
ccf10263 MD |
1486 | { |
1487 | int ret; | |
1488 | ||
1489 | rcu_read_lock(); | |
1490 | ||
1491 | switch (domain) { | |
1492 | case LTTNG_DOMAIN_KERNEL: | |
1493 | { | |
1494 | struct ltt_kernel_session *ksess; | |
1495 | ||
1496 | ksess = session->kernel_session; | |
1497 | ||
1498 | ret = kernel_untrack_pid(ksess, pid); | |
1499 | if (ret != LTTNG_OK) { | |
1500 | goto error; | |
1501 | } | |
1502 | ||
7d268848 | 1503 | kernel_wait_quiescent(); |
ccf10263 MD |
1504 | break; |
1505 | } | |
ccf10263 | 1506 | case LTTNG_DOMAIN_UST: |
a9ad0c8f MD |
1507 | { |
1508 | struct ltt_ust_session *usess; | |
1509 | ||
1510 | usess = session->ust_session; | |
1511 | ||
1512 | ret = trace_ust_untrack_pid(usess, pid); | |
1513 | if (ret != LTTNG_OK) { | |
1514 | goto error; | |
1515 | } | |
1516 | break; | |
1517 | } | |
ccf10263 MD |
1518 | default: |
1519 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1520 | goto error; | |
1521 | } | |
1522 | ||
1523 | ret = LTTNG_OK; | |
1524 | ||
1525 | error: | |
1526 | rcu_read_unlock(); | |
1527 | return ret; | |
1528 | } | |
1529 | ||
2f77fc4b DG |
1530 | /* |
1531 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
1532 | * | |
1533 | * The wpipe arguments is used as a notifier for the kernel thread. | |
1534 | */ | |
1535 | int cmd_enable_channel(struct ltt_session *session, | |
df4f5a87 | 1536 | const struct lttng_domain *domain, const struct lttng_channel *_attr, int wpipe) |
2f77fc4b DG |
1537 | { |
1538 | int ret; | |
1539 | struct ltt_ust_session *usess = session->ust_session; | |
1540 | struct lttng_ht *chan_ht; | |
1f345e94 | 1541 | size_t len; |
df4f5a87 | 1542 | struct lttng_channel attr; |
2f77fc4b DG |
1543 | |
1544 | assert(session); | |
df4f5a87 | 1545 | assert(_attr); |
7972aab2 | 1546 | assert(domain); |
2f77fc4b | 1547 | |
df4f5a87 JG |
1548 | attr = *_attr; |
1549 | len = lttng_strnlen(attr.name, sizeof(attr.name)); | |
1f345e94 PP |
1550 | |
1551 | /* Validate channel name */ | |
df4f5a87 JG |
1552 | if (attr.name[0] == '.' || |
1553 | memchr(attr.name, '/', len) != NULL) { | |
1f345e94 PP |
1554 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; |
1555 | goto end; | |
1556 | } | |
1557 | ||
df4f5a87 | 1558 | DBG("Enabling channel %s for session %s", attr.name, session->name); |
2f77fc4b | 1559 | |
03b4fdcf DG |
1560 | rcu_read_lock(); |
1561 | ||
ecc48a90 JD |
1562 | /* |
1563 | * Don't try to enable a channel if the session has been started at | |
1564 | * some point in time before. The tracer does not allow it. | |
1565 | */ | |
8382cf6f | 1566 | if (session->has_been_started) { |
ecc48a90 JD |
1567 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
1568 | goto error; | |
1569 | } | |
1570 | ||
1571 | /* | |
1572 | * If the session is a live session, remove the switch timer, the | |
1573 | * live timer does the same thing but sends also synchronisation | |
1574 | * beacons for inactive streams. | |
1575 | */ | |
1576 | if (session->live_timer > 0) { | |
df4f5a87 JG |
1577 | attr.attr.live_timer_interval = session->live_timer; |
1578 | attr.attr.switch_timer_interval = 0; | |
ecc48a90 JD |
1579 | } |
1580 | ||
6e21424e JR |
1581 | /* Check for feature support */ |
1582 | switch (domain->type) { | |
1583 | case LTTNG_DOMAIN_KERNEL: | |
1584 | { | |
7d268848 | 1585 | if (kernel_supports_ring_buffer_snapshot_sample_positions() != 1) { |
6e21424e JR |
1586 | /* Sampling position of buffer is not supported */ |
1587 | WARN("Kernel tracer does not support buffer monitoring. " | |
1588 | "Setting the monitor interval timer to 0 " | |
1589 | "(disabled) for channel '%s' of session '%s'", | |
df4f5a87 JG |
1590 | attr.name, session->name); |
1591 | lttng_channel_set_monitor_timer_interval(&attr, 0); | |
6e21424e JR |
1592 | } |
1593 | break; | |
1594 | } | |
1595 | case LTTNG_DOMAIN_UST: | |
f28f9e44 | 1596 | break; |
6e21424e JR |
1597 | case LTTNG_DOMAIN_JUL: |
1598 | case LTTNG_DOMAIN_LOG4J: | |
1599 | case LTTNG_DOMAIN_PYTHON: | |
f28f9e44 JG |
1600 | if (!agent_tracing_is_enabled()) { |
1601 | DBG("Attempted to enable a channel in an agent domain but the agent thread is not running"); | |
1602 | ret = LTTNG_ERR_AGENT_TRACING_DISABLED; | |
1603 | goto error; | |
1604 | } | |
6e21424e JR |
1605 | break; |
1606 | default: | |
1607 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1608 | goto error; | |
1609 | } | |
1610 | ||
7972aab2 | 1611 | switch (domain->type) { |
2f77fc4b DG |
1612 | case LTTNG_DOMAIN_KERNEL: |
1613 | { | |
1614 | struct ltt_kernel_channel *kchan; | |
1615 | ||
df4f5a87 | 1616 | kchan = trace_kernel_get_channel_by_name(attr.name, |
2f77fc4b DG |
1617 | session->kernel_session); |
1618 | if (kchan == NULL) { | |
54213acc JG |
1619 | if (session->snapshot.nb_output > 0 || |
1620 | session->snapshot_mode) { | |
1621 | /* Enforce mmap output for snapshot sessions. */ | |
df4f5a87 | 1622 | attr.attr.output = LTTNG_EVENT_MMAP; |
54213acc | 1623 | } |
df4f5a87 JG |
1624 | ret = channel_kernel_create(session->kernel_session, &attr, wpipe); |
1625 | if (attr.name[0] != '\0') { | |
85076754 MD |
1626 | session->kernel_session->has_non_default_channel = 1; |
1627 | } | |
2f77fc4b DG |
1628 | } else { |
1629 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
1630 | } | |
1631 | ||
f73fabfd | 1632 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1633 | goto error; |
1634 | } | |
1635 | ||
7d268848 | 1636 | kernel_wait_quiescent(); |
2f77fc4b DG |
1637 | break; |
1638 | } | |
1639 | case LTTNG_DOMAIN_UST: | |
9232818f JG |
1640 | case LTTNG_DOMAIN_JUL: |
1641 | case LTTNG_DOMAIN_LOG4J: | |
1642 | case LTTNG_DOMAIN_PYTHON: | |
2f77fc4b DG |
1643 | { |
1644 | struct ltt_ust_channel *uchan; | |
1645 | ||
9232818f JG |
1646 | /* |
1647 | * FIXME | |
1648 | * | |
1649 | * Current agent implementation limitations force us to allow | |
1650 | * only one channel at once in "agent" subdomains. Each | |
1651 | * subdomain has a default channel name which must be strictly | |
1652 | * adhered to. | |
1653 | */ | |
1654 | if (domain->type == LTTNG_DOMAIN_JUL) { | |
df4f5a87 | 1655 | if (strncmp(attr.name, DEFAULT_JUL_CHANNEL_NAME, |
9232818f JG |
1656 | LTTNG_SYMBOL_NAME_LEN)) { |
1657 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1658 | goto error; | |
1659 | } | |
1660 | } else if (domain->type == LTTNG_DOMAIN_LOG4J) { | |
df4f5a87 | 1661 | if (strncmp(attr.name, DEFAULT_LOG4J_CHANNEL_NAME, |
9232818f JG |
1662 | LTTNG_SYMBOL_NAME_LEN)) { |
1663 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1664 | goto error; | |
1665 | } | |
1666 | } else if (domain->type == LTTNG_DOMAIN_PYTHON) { | |
df4f5a87 | 1667 | if (strncmp(attr.name, DEFAULT_PYTHON_CHANNEL_NAME, |
9232818f JG |
1668 | LTTNG_SYMBOL_NAME_LEN)) { |
1669 | ret = LTTNG_ERR_INVALID_CHANNEL_NAME; | |
1670 | goto error; | |
1671 | } | |
1672 | } | |
1673 | ||
2f77fc4b DG |
1674 | chan_ht = usess->domain_global.channels; |
1675 | ||
df4f5a87 | 1676 | uchan = trace_ust_find_channel_by_name(chan_ht, attr.name); |
2f77fc4b | 1677 | if (uchan == NULL) { |
df4f5a87 JG |
1678 | ret = channel_ust_create(usess, &attr, domain->buf_type); |
1679 | if (attr.name[0] != '\0') { | |
85076754 MD |
1680 | usess->has_non_default_channel = 1; |
1681 | } | |
2f77fc4b | 1682 | } else { |
7972aab2 | 1683 | ret = channel_ust_enable(usess, uchan); |
2f77fc4b DG |
1684 | } |
1685 | break; | |
1686 | } | |
2f77fc4b | 1687 | default: |
f73fabfd | 1688 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
2f77fc4b DG |
1689 | goto error; |
1690 | } | |
1691 | ||
df4f5a87 | 1692 | if (ret == LTTNG_OK && attr.attr.output != LTTNG_EVENT_MMAP) { |
54213acc JG |
1693 | session->has_non_mmap_channel = true; |
1694 | } | |
2f77fc4b | 1695 | error: |
2223c96f | 1696 | rcu_read_unlock(); |
1f345e94 | 1697 | end: |
2f77fc4b DG |
1698 | return ret; |
1699 | } | |
1700 | ||
2f77fc4b DG |
1701 | /* |
1702 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1703 | */ | |
56a37563 | 1704 | int cmd_disable_event(struct ltt_session *session, |
df4f5a87 JG |
1705 | enum lttng_domain_type domain, const char *channel_name, |
1706 | const struct lttng_event *event) | |
2f77fc4b DG |
1707 | { |
1708 | int ret; | |
df4f5a87 | 1709 | const char *event_name; |
6e911cad | 1710 | |
18a720cd MD |
1711 | DBG("Disable event command for event \'%s\'", event->name); |
1712 | ||
6e911cad MD |
1713 | event_name = event->name; |
1714 | ||
9b7431cf JG |
1715 | /* Error out on unhandled search criteria */ |
1716 | if (event->loglevel_type || event->loglevel != -1 || event->enabled | |
6e911cad | 1717 | || event->pid || event->filter || event->exclusion) { |
7076b56e JG |
1718 | ret = LTTNG_ERR_UNK; |
1719 | goto error; | |
6e911cad | 1720 | } |
2f77fc4b | 1721 | |
2223c96f DG |
1722 | rcu_read_lock(); |
1723 | ||
2f77fc4b DG |
1724 | switch (domain) { |
1725 | case LTTNG_DOMAIN_KERNEL: | |
1726 | { | |
1727 | struct ltt_kernel_channel *kchan; | |
1728 | struct ltt_kernel_session *ksess; | |
1729 | ||
1730 | ksess = session->kernel_session; | |
1731 | ||
85076754 MD |
1732 | /* |
1733 | * If a non-default channel has been created in the | |
1734 | * session, explicitely require that -c chan_name needs | |
1735 | * to be provided. | |
1736 | */ | |
1737 | if (ksess->has_non_default_channel && channel_name[0] == '\0') { | |
1738 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1739 | goto error_unlock; |
85076754 MD |
1740 | } |
1741 | ||
2f77fc4b DG |
1742 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
1743 | if (kchan == NULL) { | |
f73fabfd | 1744 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
7076b56e | 1745 | goto error_unlock; |
2f77fc4b DG |
1746 | } |
1747 | ||
6e911cad MD |
1748 | switch (event->type) { |
1749 | case LTTNG_EVENT_ALL: | |
9550ee81 | 1750 | case LTTNG_EVENT_TRACEPOINT: |
d0ae4ea8 | 1751 | case LTTNG_EVENT_SYSCALL: |
9550ee81 JR |
1752 | case LTTNG_EVENT_PROBE: |
1753 | case LTTNG_EVENT_FUNCTION: | |
1754 | case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */ | |
1755 | if (event_name[0] == '\0') { | |
1756 | ret = event_kernel_disable_event(kchan, | |
1757 | NULL, event->type); | |
29c62722 | 1758 | } else { |
d0ae4ea8 | 1759 | ret = event_kernel_disable_event(kchan, |
9550ee81 | 1760 | event_name, event->type); |
29c62722 | 1761 | } |
6e911cad | 1762 | if (ret != LTTNG_OK) { |
7076b56e | 1763 | goto error_unlock; |
6e911cad MD |
1764 | } |
1765 | break; | |
6e911cad MD |
1766 | default: |
1767 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1768 | goto error_unlock; |
2f77fc4b DG |
1769 | } |
1770 | ||
7d268848 | 1771 | kernel_wait_quiescent(); |
2f77fc4b DG |
1772 | break; |
1773 | } | |
1774 | case LTTNG_DOMAIN_UST: | |
1775 | { | |
1776 | struct ltt_ust_channel *uchan; | |
1777 | struct ltt_ust_session *usess; | |
1778 | ||
1779 | usess = session->ust_session; | |
1780 | ||
7076b56e JG |
1781 | if (validate_ust_event_name(event_name)) { |
1782 | ret = LTTNG_ERR_INVALID_EVENT_NAME; | |
1783 | goto error_unlock; | |
1784 | } | |
1785 | ||
85076754 MD |
1786 | /* |
1787 | * If a non-default channel has been created in the | |
9550ee81 | 1788 | * session, explicitly require that -c chan_name needs |
85076754 MD |
1789 | * to be provided. |
1790 | */ | |
1791 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
1792 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
7076b56e | 1793 | goto error_unlock; |
85076754 MD |
1794 | } |
1795 | ||
2f77fc4b DG |
1796 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
1797 | channel_name); | |
1798 | if (uchan == NULL) { | |
f73fabfd | 1799 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
7076b56e | 1800 | goto error_unlock; |
2f77fc4b DG |
1801 | } |
1802 | ||
6e911cad MD |
1803 | switch (event->type) { |
1804 | case LTTNG_EVENT_ALL: | |
b3639870 JR |
1805 | /* |
1806 | * An empty event name means that everything | |
1807 | * should be disabled. | |
1808 | */ | |
1809 | if (event->name[0] == '\0') { | |
1810 | ret = event_ust_disable_all_tracepoints(usess, uchan); | |
77d536b2 JR |
1811 | } else { |
1812 | ret = event_ust_disable_tracepoint(usess, uchan, | |
1813 | event_name); | |
1814 | } | |
6e911cad | 1815 | if (ret != LTTNG_OK) { |
7076b56e | 1816 | goto error_unlock; |
6e911cad MD |
1817 | } |
1818 | break; | |
1819 | default: | |
1820 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1821 | goto error_unlock; |
2f77fc4b DG |
1822 | } |
1823 | ||
1824 | DBG3("Disable UST event %s in channel %s completed", event_name, | |
1825 | channel_name); | |
1826 | break; | |
1827 | } | |
5cdb6027 | 1828 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 1829 | case LTTNG_DOMAIN_JUL: |
0e115563 | 1830 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 1831 | { |
fefd409b | 1832 | struct agent *agt; |
f20baf8e DG |
1833 | struct ltt_ust_session *usess = session->ust_session; |
1834 | ||
1835 | assert(usess); | |
1836 | ||
6e911cad MD |
1837 | switch (event->type) { |
1838 | case LTTNG_EVENT_ALL: | |
1839 | break; | |
1840 | default: | |
1841 | ret = LTTNG_ERR_UNK; | |
7076b56e | 1842 | goto error_unlock; |
6e911cad MD |
1843 | } |
1844 | ||
5cdb6027 | 1845 | agt = trace_ust_find_agent(usess, domain); |
fefd409b DG |
1846 | if (!agt) { |
1847 | ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
7076b56e | 1848 | goto error_unlock; |
fefd409b | 1849 | } |
b3639870 JR |
1850 | /* |
1851 | * An empty event name means that everything | |
1852 | * should be disabled. | |
1853 | */ | |
1854 | if (event->name[0] == '\0') { | |
18a720cd MD |
1855 | ret = event_agent_disable_all(usess, agt); |
1856 | } else { | |
1857 | ret = event_agent_disable(usess, agt, event_name); | |
1858 | } | |
f20baf8e | 1859 | if (ret != LTTNG_OK) { |
7076b56e | 1860 | goto error_unlock; |
f20baf8e DG |
1861 | } |
1862 | ||
1863 | break; | |
1864 | } | |
2f77fc4b | 1865 | default: |
f73fabfd | 1866 | ret = LTTNG_ERR_UND; |
7076b56e | 1867 | goto error_unlock; |
2f77fc4b DG |
1868 | } |
1869 | ||
f73fabfd | 1870 | ret = LTTNG_OK; |
2f77fc4b | 1871 | |
7076b56e | 1872 | error_unlock: |
2223c96f | 1873 | rcu_read_unlock(); |
7076b56e | 1874 | error: |
2f77fc4b DG |
1875 | return ret; |
1876 | } | |
1877 | ||
2f77fc4b DG |
1878 | /* |
1879 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1880 | */ | |
56a37563 | 1881 | int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain, |
df4f5a87 | 1882 | char *channel_name, const struct lttng_event_context *ctx, int kwpipe) |
2f77fc4b | 1883 | { |
d5979e4a | 1884 | int ret, chan_kern_created = 0, chan_ust_created = 0; |
bdf64013 JG |
1885 | char *app_ctx_provider_name = NULL, *app_ctx_name = NULL; |
1886 | ||
9a699f7b JR |
1887 | /* |
1888 | * Don't try to add a context if the session has been started at | |
1889 | * some point in time before. The tracer does not allow it and would | |
1890 | * result in a corrupted trace. | |
1891 | */ | |
1892 | if (session->has_been_started) { | |
1893 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; | |
1894 | goto end; | |
1895 | } | |
1896 | ||
bdf64013 JG |
1897 | if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) { |
1898 | app_ctx_provider_name = ctx->u.app_ctx.provider_name; | |
1899 | app_ctx_name = ctx->u.app_ctx.ctx_name; | |
1900 | } | |
2f77fc4b DG |
1901 | |
1902 | switch (domain) { | |
1903 | case LTTNG_DOMAIN_KERNEL: | |
979e618e DG |
1904 | assert(session->kernel_session); |
1905 | ||
1906 | if (session->kernel_session->channel_count == 0) { | |
1907 | /* Create default channel */ | |
1908 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); | |
1909 | if (ret != LTTNG_OK) { | |
1910 | goto error; | |
1911 | } | |
d5979e4a | 1912 | chan_kern_created = 1; |
979e618e | 1913 | } |
2f77fc4b | 1914 | /* Add kernel context to kernel tracer */ |
601d5acf | 1915 | ret = context_kernel_add(session->kernel_session, ctx, channel_name); |
f73fabfd | 1916 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1917 | goto error; |
1918 | } | |
1919 | break; | |
bdf64013 JG |
1920 | case LTTNG_DOMAIN_JUL: |
1921 | case LTTNG_DOMAIN_LOG4J: | |
1922 | { | |
1923 | /* | |
1924 | * Validate channel name. | |
1925 | * If no channel name is given and the domain is JUL or LOG4J, | |
1926 | * set it to the appropriate domain-specific channel name. If | |
1927 | * a name is provided but does not match the expexted channel | |
1928 | * name, return an error. | |
1929 | */ | |
1930 | if (domain == LTTNG_DOMAIN_JUL && *channel_name && | |
1931 | strcmp(channel_name, | |
1932 | DEFAULT_JUL_CHANNEL_NAME)) { | |
1933 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1934 | goto error; | |
1935 | } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name && | |
1936 | strcmp(channel_name, | |
1937 | DEFAULT_LOG4J_CHANNEL_NAME)) { | |
1938 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
1939 | goto error; | |
1940 | } | |
a93b3916 | 1941 | /* break is _not_ missing here. */ |
bdf64013 | 1942 | } |
2f77fc4b DG |
1943 | case LTTNG_DOMAIN_UST: |
1944 | { | |
1945 | struct ltt_ust_session *usess = session->ust_session; | |
85076754 MD |
1946 | unsigned int chan_count; |
1947 | ||
2f77fc4b DG |
1948 | assert(usess); |
1949 | ||
85076754 | 1950 | chan_count = lttng_ht_get_count(usess->domain_global.channels); |
979e618e DG |
1951 | if (chan_count == 0) { |
1952 | struct lttng_channel *attr; | |
1953 | /* Create default channel */ | |
0a9c6494 | 1954 | attr = channel_new_default_attr(domain, usess->buffer_type); |
979e618e DG |
1955 | if (attr == NULL) { |
1956 | ret = LTTNG_ERR_FATAL; | |
1957 | goto error; | |
1958 | } | |
1959 | ||
7972aab2 | 1960 | ret = channel_ust_create(usess, attr, usess->buffer_type); |
979e618e DG |
1961 | if (ret != LTTNG_OK) { |
1962 | free(attr); | |
1963 | goto error; | |
1964 | } | |
cf0bcb51 | 1965 | channel_attr_destroy(attr); |
d5979e4a | 1966 | chan_ust_created = 1; |
979e618e DG |
1967 | } |
1968 | ||
601d5acf | 1969 | ret = context_ust_add(usess, domain, ctx, channel_name); |
bdf64013 JG |
1970 | free(app_ctx_provider_name); |
1971 | free(app_ctx_name); | |
1972 | app_ctx_name = NULL; | |
1973 | app_ctx_provider_name = NULL; | |
f73fabfd | 1974 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
1975 | goto error; |
1976 | } | |
1977 | break; | |
1978 | } | |
2f77fc4b | 1979 | default: |
f73fabfd | 1980 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
1981 | goto error; |
1982 | } | |
1983 | ||
bdf64013 JG |
1984 | ret = LTTNG_OK; |
1985 | goto end; | |
2f77fc4b DG |
1986 | |
1987 | error: | |
d5979e4a DG |
1988 | if (chan_kern_created) { |
1989 | struct ltt_kernel_channel *kchan = | |
1990 | trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME, | |
1991 | session->kernel_session); | |
1992 | /* Created previously, this should NOT fail. */ | |
1993 | assert(kchan); | |
1994 | kernel_destroy_channel(kchan); | |
1995 | } | |
1996 | ||
1997 | if (chan_ust_created) { | |
1998 | struct ltt_ust_channel *uchan = | |
1999 | trace_ust_find_channel_by_name( | |
2000 | session->ust_session->domain_global.channels, | |
2001 | DEFAULT_CHANNEL_NAME); | |
2002 | /* Created previously, this should NOT fail. */ | |
2003 | assert(uchan); | |
2004 | /* Remove from the channel list of the session. */ | |
2005 | trace_ust_delete_channel(session->ust_session->domain_global.channels, | |
2006 | uchan); | |
2007 | trace_ust_destroy_channel(uchan); | |
2008 | } | |
bdf64013 JG |
2009 | end: |
2010 | free(app_ctx_provider_name); | |
2011 | free(app_ctx_name); | |
2f77fc4b DG |
2012 | return ret; |
2013 | } | |
2014 | ||
dac8e046 JG |
2015 | static inline bool name_starts_with(const char *name, const char *prefix) |
2016 | { | |
2017 | const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN); | |
2018 | ||
2019 | return !strncmp(name, prefix, max_cmp_len); | |
2020 | } | |
2021 | ||
2022 | /* Perform userspace-specific event name validation */ | |
2023 | static int validate_ust_event_name(const char *name) | |
2024 | { | |
2025 | int ret = 0; | |
2026 | ||
2027 | if (!name) { | |
2028 | ret = -1; | |
2029 | goto end; | |
2030 | } | |
2031 | ||
2032 | /* | |
2033 | * Check name against all internal UST event component namespaces used | |
2034 | * by the agents. | |
2035 | */ | |
2036 | if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) || | |
2037 | name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) || | |
2038 | name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) { | |
2039 | ret = -1; | |
2040 | } | |
2041 | ||
2042 | end: | |
2043 | return ret; | |
2044 | } | |
88f06f15 | 2045 | |
2f77fc4b | 2046 | /* |
88f06f15 JG |
2047 | * Internal version of cmd_enable_event() with a supplemental |
2048 | * "internal_event" flag which is used to enable internal events which should | |
2049 | * be hidden from clients. Such events are used in the agent implementation to | |
2050 | * enable the events through which all "agent" events are funeled. | |
2f77fc4b | 2051 | */ |
88f06f15 | 2052 | static int _cmd_enable_event(struct ltt_session *session, |
df4f5a87 | 2053 | const struct lttng_domain *domain, |
025faf73 | 2054 | char *channel_name, struct lttng_event *event, |
6b453b5e | 2055 | char *filter_expression, |
db8f1377 JI |
2056 | struct lttng_filter_bytecode *filter, |
2057 | struct lttng_event_exclusion *exclusion, | |
88f06f15 | 2058 | int wpipe, bool internal_event) |
2f77fc4b | 2059 | { |
9f449915 | 2060 | int ret = 0, channel_created = 0; |
cfedea03 | 2061 | struct lttng_channel *attr = NULL; |
2f77fc4b DG |
2062 | |
2063 | assert(session); | |
2064 | assert(event); | |
2065 | assert(channel_name); | |
2066 | ||
2a385866 JG |
2067 | /* If we have a filter, we must have its filter expression */ |
2068 | assert(!(!!filter_expression ^ !!filter)); | |
2069 | ||
9f449915 PP |
2070 | /* Normalize event name as a globbing pattern */ |
2071 | strutils_normalize_star_glob_pattern(event->name); | |
18a720cd | 2072 | |
9f449915 PP |
2073 | /* Normalize exclusion names as globbing patterns */ |
2074 | if (exclusion) { | |
2075 | size_t i; | |
f5ac4bd7 | 2076 | |
9f449915 PP |
2077 | for (i = 0; i < exclusion->count; i++) { |
2078 | char *name = LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i); | |
2079 | ||
2080 | strutils_normalize_star_glob_pattern(name); | |
2081 | } | |
930a2e99 JG |
2082 | } |
2083 | ||
9f449915 PP |
2084 | DBG("Enable event command for event \'%s\'", event->name); |
2085 | ||
2086 | rcu_read_lock(); | |
2087 | ||
7972aab2 | 2088 | switch (domain->type) { |
2f77fc4b DG |
2089 | case LTTNG_DOMAIN_KERNEL: |
2090 | { | |
2091 | struct ltt_kernel_channel *kchan; | |
2092 | ||
85076754 MD |
2093 | /* |
2094 | * If a non-default channel has been created in the | |
2095 | * session, explicitely require that -c chan_name needs | |
2096 | * to be provided. | |
2097 | */ | |
2098 | if (session->kernel_session->has_non_default_channel | |
2099 | && channel_name[0] == '\0') { | |
2100 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
2101 | goto error; | |
2102 | } | |
2103 | ||
2f77fc4b DG |
2104 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2105 | session->kernel_session); | |
2106 | if (kchan == NULL) { | |
0a9c6494 DG |
2107 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
2108 | LTTNG_BUFFER_GLOBAL); | |
2f77fc4b | 2109 | if (attr == NULL) { |
f73fabfd | 2110 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2111 | goto error; |
2112 | } | |
04c17253 MD |
2113 | if (lttng_strncpy(attr->name, channel_name, |
2114 | sizeof(attr->name))) { | |
2115 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
2116 | goto error; |
2117 | } | |
2f77fc4b DG |
2118 | |
2119 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 2120 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2121 | goto error; |
2122 | } | |
e5f5db7f | 2123 | channel_created = 1; |
2f77fc4b DG |
2124 | } |
2125 | ||
2126 | /* Get the newly created kernel channel pointer */ | |
2127 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2128 | session->kernel_session); | |
2129 | if (kchan == NULL) { | |
2130 | /* This sould not happen... */ | |
f73fabfd | 2131 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2132 | goto error; |
2133 | } | |
2134 | ||
6e911cad MD |
2135 | switch (event->type) { |
2136 | case LTTNG_EVENT_ALL: | |
29c62722 | 2137 | { |
00a62084 MD |
2138 | char *filter_expression_a = NULL; |
2139 | struct lttng_filter_bytecode *filter_a = NULL; | |
2140 | ||
2141 | /* | |
2142 | * We need to duplicate filter_expression and filter, | |
2143 | * because ownership is passed to first enable | |
2144 | * event. | |
2145 | */ | |
2146 | if (filter_expression) { | |
2147 | filter_expression_a = strdup(filter_expression); | |
2148 | if (!filter_expression_a) { | |
2149 | ret = LTTNG_ERR_FATAL; | |
2150 | goto error; | |
2151 | } | |
2152 | } | |
2153 | if (filter) { | |
2154 | filter_a = zmalloc(sizeof(*filter_a) + filter->len); | |
2155 | if (!filter_a) { | |
2156 | free(filter_expression_a); | |
2157 | ret = LTTNG_ERR_FATAL; | |
2158 | goto error; | |
2159 | } | |
2160 | memcpy(filter_a, filter, sizeof(*filter_a) + filter->len); | |
2161 | } | |
29c62722 | 2162 | event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */ |
00a62084 MD |
2163 | ret = event_kernel_enable_event(kchan, event, |
2164 | filter_expression, filter); | |
a969e101 MD |
2165 | /* We have passed ownership */ |
2166 | filter_expression = NULL; | |
2167 | filter = NULL; | |
29c62722 MD |
2168 | if (ret != LTTNG_OK) { |
2169 | if (channel_created) { | |
2170 | /* Let's not leak a useless channel. */ | |
2171 | kernel_destroy_channel(kchan); | |
2172 | } | |
00a62084 MD |
2173 | free(filter_expression_a); |
2174 | free(filter_a); | |
29c62722 MD |
2175 | goto error; |
2176 | } | |
2177 | event->type = LTTNG_EVENT_SYSCALL; /* Hack */ | |
00a62084 MD |
2178 | ret = event_kernel_enable_event(kchan, event, |
2179 | filter_expression_a, filter_a); | |
60d21fa2 AB |
2180 | /* We have passed ownership */ |
2181 | filter_expression_a = NULL; | |
2182 | filter_a = NULL; | |
29c62722 MD |
2183 | if (ret != LTTNG_OK) { |
2184 | goto error; | |
2185 | } | |
2186 | break; | |
2187 | } | |
6e6ef3d7 | 2188 | case LTTNG_EVENT_PROBE: |
dcabc190 | 2189 | case LTTNG_EVENT_USERSPACE_PROBE: |
6e6ef3d7 DG |
2190 | case LTTNG_EVENT_FUNCTION: |
2191 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
6e911cad | 2192 | case LTTNG_EVENT_TRACEPOINT: |
00a62084 MD |
2193 | ret = event_kernel_enable_event(kchan, event, |
2194 | filter_expression, filter); | |
a969e101 MD |
2195 | /* We have passed ownership */ |
2196 | filter_expression = NULL; | |
2197 | filter = NULL; | |
6e911cad MD |
2198 | if (ret != LTTNG_OK) { |
2199 | if (channel_created) { | |
2200 | /* Let's not leak a useless channel. */ | |
2201 | kernel_destroy_channel(kchan); | |
2202 | } | |
2203 | goto error; | |
e5f5db7f | 2204 | } |
6e911cad MD |
2205 | break; |
2206 | case LTTNG_EVENT_SYSCALL: | |
00a62084 MD |
2207 | ret = event_kernel_enable_event(kchan, event, |
2208 | filter_expression, filter); | |
a969e101 MD |
2209 | /* We have passed ownership */ |
2210 | filter_expression = NULL; | |
2211 | filter = NULL; | |
e2b957af MD |
2212 | if (ret != LTTNG_OK) { |
2213 | goto error; | |
2214 | } | |
6e911cad MD |
2215 | break; |
2216 | default: | |
2217 | ret = LTTNG_ERR_UNK; | |
2f77fc4b DG |
2218 | goto error; |
2219 | } | |
2220 | ||
7d268848 | 2221 | kernel_wait_quiescent(); |
2f77fc4b DG |
2222 | break; |
2223 | } | |
2224 | case LTTNG_DOMAIN_UST: | |
2225 | { | |
2226 | struct ltt_ust_channel *uchan; | |
2227 | struct ltt_ust_session *usess = session->ust_session; | |
2228 | ||
2229 | assert(usess); | |
2230 | ||
85076754 MD |
2231 | /* |
2232 | * If a non-default channel has been created in the | |
2233 | * session, explicitely require that -c chan_name needs | |
2234 | * to be provided. | |
2235 | */ | |
2236 | if (usess->has_non_default_channel && channel_name[0] == '\0') { | |
2237 | ret = LTTNG_ERR_NEED_CHANNEL_NAME; | |
2238 | goto error; | |
2239 | } | |
2240 | ||
2f77fc4b DG |
2241 | /* Get channel from global UST domain */ |
2242 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2243 | channel_name); | |
2244 | if (uchan == NULL) { | |
2245 | /* Create default channel */ | |
0a9c6494 DG |
2246 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
2247 | usess->buffer_type); | |
2f77fc4b | 2248 | if (attr == NULL) { |
f73fabfd | 2249 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
2250 | goto error; |
2251 | } | |
04c17253 MD |
2252 | if (lttng_strncpy(attr->name, channel_name, |
2253 | sizeof(attr->name))) { | |
2254 | ret = LTTNG_ERR_INVALID; | |
04c17253 MD |
2255 | goto error; |
2256 | } | |
2f77fc4b DG |
2257 | |
2258 | ret = cmd_enable_channel(session, domain, attr, wpipe); | |
f73fabfd | 2259 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2260 | goto error; |
2261 | } | |
2f77fc4b DG |
2262 | |
2263 | /* Get the newly created channel reference back */ | |
2264 | uchan = trace_ust_find_channel_by_name( | |
2265 | usess->domain_global.channels, channel_name); | |
2266 | assert(uchan); | |
2267 | } | |
2268 | ||
141feb8c JG |
2269 | if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) { |
2270 | /* | |
2271 | * Don't allow users to add UST events to channels which | |
2272 | * are assigned to a userspace subdomain (JUL, Log4J, | |
2273 | * Python, etc.). | |
2274 | */ | |
2275 | ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN; | |
2276 | goto error; | |
2277 | } | |
2278 | ||
dac8e046 JG |
2279 | if (!internal_event) { |
2280 | /* | |
2281 | * Ensure the event name is not reserved for internal | |
2282 | * use. | |
2283 | */ | |
2284 | ret = validate_ust_event_name(event->name); | |
2285 | if (ret) { | |
2286 | WARN("Userspace event name %s failed validation.", | |
bbcab087 | 2287 | event->name); |
dac8e046 JG |
2288 | ret = LTTNG_ERR_INVALID_EVENT_NAME; |
2289 | goto error; | |
2290 | } | |
2291 | } | |
2292 | ||
2f77fc4b | 2293 | /* At this point, the session and channel exist on the tracer */ |
6b453b5e | 2294 | ret = event_ust_enable_tracepoint(usess, uchan, event, |
88f06f15 JG |
2295 | filter_expression, filter, exclusion, |
2296 | internal_event); | |
49d21f93 MD |
2297 | /* We have passed ownership */ |
2298 | filter_expression = NULL; | |
2299 | filter = NULL; | |
2300 | exclusion = NULL; | |
94382e15 JG |
2301 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2302 | goto already_enabled; | |
2303 | } else if (ret != LTTNG_OK) { | |
2f77fc4b DG |
2304 | goto error; |
2305 | } | |
2306 | break; | |
2307 | } | |
5cdb6027 | 2308 | case LTTNG_DOMAIN_LOG4J: |
f20baf8e | 2309 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2310 | case LTTNG_DOMAIN_PYTHON: |
f20baf8e | 2311 | { |
da6c3a50 | 2312 | const char *default_event_name, *default_chan_name; |
fefd409b | 2313 | struct agent *agt; |
f20baf8e DG |
2314 | struct lttng_event uevent; |
2315 | struct lttng_domain tmp_dom; | |
2316 | struct ltt_ust_session *usess = session->ust_session; | |
2317 | ||
2318 | assert(usess); | |
2319 | ||
f28f9e44 JG |
2320 | if (!agent_tracing_is_enabled()) { |
2321 | DBG("Attempted to enable an event in an agent domain but the agent thread is not running"); | |
2322 | ret = LTTNG_ERR_AGENT_TRACING_DISABLED; | |
2323 | goto error; | |
2324 | } | |
2325 | ||
5cdb6027 | 2326 | agt = trace_ust_find_agent(usess, domain->type); |
fefd409b | 2327 | if (!agt) { |
5cdb6027 | 2328 | agt = agent_create(domain->type); |
fefd409b | 2329 | if (!agt) { |
e5b3c48c | 2330 | ret = LTTNG_ERR_NOMEM; |
fefd409b DG |
2331 | goto error; |
2332 | } | |
2333 | agent_add(agt, usess->agents); | |
2334 | } | |
2335 | ||
022d91ba | 2336 | /* Create the default tracepoint. */ |
996de3c7 | 2337 | memset(&uevent, 0, sizeof(uevent)); |
f20baf8e DG |
2338 | uevent.type = LTTNG_EVENT_TRACEPOINT; |
2339 | uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
51755dc8 JG |
2340 | default_event_name = event_get_default_agent_ust_name( |
2341 | domain->type); | |
da6c3a50 | 2342 | if (!default_event_name) { |
e5b3c48c | 2343 | ret = LTTNG_ERR_FATAL; |
da6c3a50 | 2344 | goto error; |
f43f95a9 | 2345 | } |
da6c3a50 | 2346 | strncpy(uevent.name, default_event_name, sizeof(uevent.name)); |
f20baf8e DG |
2347 | uevent.name[sizeof(uevent.name) - 1] = '\0'; |
2348 | ||
2349 | /* | |
2350 | * The domain type is changed because we are about to enable the | |
2351 | * default channel and event for the JUL domain that are hardcoded. | |
2352 | * This happens in the UST domain. | |
2353 | */ | |
2354 | memcpy(&tmp_dom, domain, sizeof(tmp_dom)); | |
2355 | tmp_dom.type = LTTNG_DOMAIN_UST; | |
2356 | ||
0e115563 DG |
2357 | switch (domain->type) { |
2358 | case LTTNG_DOMAIN_LOG4J: | |
da6c3a50 | 2359 | default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME; |
0e115563 DG |
2360 | break; |
2361 | case LTTNG_DOMAIN_JUL: | |
da6c3a50 | 2362 | default_chan_name = DEFAULT_JUL_CHANNEL_NAME; |
0e115563 DG |
2363 | break; |
2364 | case LTTNG_DOMAIN_PYTHON: | |
2365 | default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
2366 | break; | |
2367 | default: | |
e98a44b0 | 2368 | /* The switch/case we are in makes this impossible */ |
0e115563 | 2369 | assert(0); |
da6c3a50 DG |
2370 | } |
2371 | ||
971da06a | 2372 | { |
8404118c | 2373 | char *filter_expression_copy = NULL; |
51755dc8 | 2374 | struct lttng_filter_bytecode *filter_copy = NULL; |
971da06a JG |
2375 | |
2376 | if (filter) { | |
51755dc8 JG |
2377 | const size_t filter_size = sizeof( |
2378 | struct lttng_filter_bytecode) | |
2379 | + filter->len; | |
2380 | ||
2381 | filter_copy = zmalloc(filter_size); | |
971da06a | 2382 | if (!filter_copy) { |
018096a4 | 2383 | ret = LTTNG_ERR_NOMEM; |
b742e3e2 | 2384 | goto error; |
971da06a | 2385 | } |
51755dc8 | 2386 | memcpy(filter_copy, filter, filter_size); |
971da06a | 2387 | |
8404118c JG |
2388 | filter_expression_copy = |
2389 | strdup(filter_expression); | |
2390 | if (!filter_expression) { | |
2391 | ret = LTTNG_ERR_NOMEM; | |
51755dc8 JG |
2392 | } |
2393 | ||
2394 | if (!filter_expression_copy || !filter_copy) { | |
2395 | free(filter_expression_copy); | |
2396 | free(filter_copy); | |
2397 | goto error; | |
8404118c | 2398 | } |
971da06a JG |
2399 | } |
2400 | ||
88f06f15 | 2401 | ret = cmd_enable_event_internal(session, &tmp_dom, |
971da06a | 2402 | (char *) default_chan_name, |
8404118c JG |
2403 | &uevent, filter_expression_copy, |
2404 | filter_copy, NULL, wpipe); | |
971da06a JG |
2405 | } |
2406 | ||
94382e15 JG |
2407 | if (ret == LTTNG_ERR_UST_EVENT_ENABLED) { |
2408 | goto already_enabled; | |
2409 | } else if (ret != LTTNG_OK) { | |
f20baf8e DG |
2410 | goto error; |
2411 | } | |
2412 | ||
2413 | /* The wild card * means that everything should be enabled. */ | |
2414 | if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) { | |
8404118c JG |
2415 | ret = event_agent_enable_all(usess, agt, event, filter, |
2416 | filter_expression); | |
f20baf8e | 2417 | } else { |
8404118c JG |
2418 | ret = event_agent_enable(usess, agt, event, filter, |
2419 | filter_expression); | |
f20baf8e | 2420 | } |
51755dc8 JG |
2421 | filter = NULL; |
2422 | filter_expression = NULL; | |
f20baf8e DG |
2423 | if (ret != LTTNG_OK) { |
2424 | goto error; | |
2425 | } | |
2426 | ||
2427 | break; | |
2428 | } | |
2f77fc4b | 2429 | default: |
f73fabfd | 2430 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2431 | goto error; |
2432 | } | |
2433 | ||
f73fabfd | 2434 | ret = LTTNG_OK; |
2f77fc4b | 2435 | |
94382e15 | 2436 | already_enabled: |
2f77fc4b | 2437 | error: |
49d21f93 MD |
2438 | free(filter_expression); |
2439 | free(filter); | |
2440 | free(exclusion); | |
cf0bcb51 | 2441 | channel_attr_destroy(attr); |
2223c96f | 2442 | rcu_read_unlock(); |
2f77fc4b DG |
2443 | return ret; |
2444 | } | |
2445 | ||
88f06f15 JG |
2446 | /* |
2447 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2448 | * We own filter, exclusion, and filter_expression. | |
2449 | */ | |
df4f5a87 JG |
2450 | int cmd_enable_event(struct ltt_session *session, |
2451 | const struct lttng_domain *domain, | |
88f06f15 JG |
2452 | char *channel_name, struct lttng_event *event, |
2453 | char *filter_expression, | |
2454 | struct lttng_filter_bytecode *filter, | |
2455 | struct lttng_event_exclusion *exclusion, | |
2456 | int wpipe) | |
2457 | { | |
2458 | return _cmd_enable_event(session, domain, channel_name, event, | |
2459 | filter_expression, filter, exclusion, wpipe, false); | |
2460 | } | |
2461 | ||
2462 | /* | |
2463 | * Enable an event which is internal to LTTng. An internal should | |
2464 | * never be made visible to clients and are immune to checks such as | |
2465 | * reserved names. | |
2466 | */ | |
2467 | static int cmd_enable_event_internal(struct ltt_session *session, | |
df4f5a87 | 2468 | const struct lttng_domain *domain, |
88f06f15 JG |
2469 | char *channel_name, struct lttng_event *event, |
2470 | char *filter_expression, | |
2471 | struct lttng_filter_bytecode *filter, | |
2472 | struct lttng_event_exclusion *exclusion, | |
2473 | int wpipe) | |
2474 | { | |
2475 | return _cmd_enable_event(session, domain, channel_name, event, | |
2476 | filter_expression, filter, exclusion, wpipe, true); | |
2477 | } | |
2478 | ||
2f77fc4b DG |
2479 | /* |
2480 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2481 | */ | |
56a37563 JG |
2482 | ssize_t cmd_list_tracepoints(enum lttng_domain_type domain, |
2483 | struct lttng_event **events) | |
2f77fc4b DG |
2484 | { |
2485 | int ret; | |
2486 | ssize_t nb_events = 0; | |
2487 | ||
2488 | switch (domain) { | |
2489 | case LTTNG_DOMAIN_KERNEL: | |
7d268848 | 2490 | nb_events = kernel_list_events(events); |
2f77fc4b | 2491 | if (nb_events < 0) { |
f73fabfd | 2492 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
2f77fc4b DG |
2493 | goto error; |
2494 | } | |
2495 | break; | |
2496 | case LTTNG_DOMAIN_UST: | |
2497 | nb_events = ust_app_list_events(events); | |
2498 | if (nb_events < 0) { | |
f73fabfd | 2499 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2500 | goto error; |
2501 | } | |
2502 | break; | |
5cdb6027 | 2503 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 2504 | case LTTNG_DOMAIN_JUL: |
0e115563 | 2505 | case LTTNG_DOMAIN_PYTHON: |
f60140a1 | 2506 | nb_events = agent_list_events(events, domain); |
3c6a091f DG |
2507 | if (nb_events < 0) { |
2508 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2509 | goto error; | |
2510 | } | |
2511 | break; | |
2f77fc4b | 2512 | default: |
f73fabfd | 2513 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2514 | goto error; |
2515 | } | |
2516 | ||
2517 | return nb_events; | |
2518 | ||
2519 | error: | |
2520 | /* Return negative value to differentiate return code */ | |
2521 | return -ret; | |
2522 | } | |
2523 | ||
2524 | /* | |
2525 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
2526 | */ | |
56a37563 | 2527 | ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain, |
2f77fc4b DG |
2528 | struct lttng_event_field **fields) |
2529 | { | |
2530 | int ret; | |
2531 | ssize_t nb_fields = 0; | |
2532 | ||
2533 | switch (domain) { | |
2534 | case LTTNG_DOMAIN_UST: | |
2535 | nb_fields = ust_app_list_event_fields(fields); | |
2536 | if (nb_fields < 0) { | |
f73fabfd | 2537 | ret = LTTNG_ERR_UST_LIST_FAIL; |
2f77fc4b DG |
2538 | goto error; |
2539 | } | |
2540 | break; | |
2541 | case LTTNG_DOMAIN_KERNEL: | |
2542 | default: /* fall-through */ | |
f73fabfd | 2543 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2544 | goto error; |
2545 | } | |
2546 | ||
2547 | return nb_fields; | |
2548 | ||
2549 | error: | |
2550 | /* Return negative value to differentiate return code */ | |
2551 | return -ret; | |
2552 | } | |
2553 | ||
834978fd DG |
2554 | ssize_t cmd_list_syscalls(struct lttng_event **events) |
2555 | { | |
2556 | return syscall_table_list(events); | |
2557 | } | |
2558 | ||
a5dfbb9d MD |
2559 | /* |
2560 | * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread. | |
2561 | * | |
2562 | * Called with session lock held. | |
2563 | */ | |
2564 | ssize_t cmd_list_tracker_pids(struct ltt_session *session, | |
56a37563 | 2565 | enum lttng_domain_type domain, int32_t **pids) |
a5dfbb9d MD |
2566 | { |
2567 | int ret; | |
2568 | ssize_t nr_pids = 0; | |
2569 | ||
2570 | switch (domain) { | |
2571 | case LTTNG_DOMAIN_KERNEL: | |
2572 | { | |
2573 | struct ltt_kernel_session *ksess; | |
2574 | ||
2575 | ksess = session->kernel_session; | |
2576 | nr_pids = kernel_list_tracker_pids(ksess, pids); | |
2577 | if (nr_pids < 0) { | |
2578 | ret = LTTNG_ERR_KERN_LIST_FAIL; | |
2579 | goto error; | |
2580 | } | |
2581 | break; | |
2582 | } | |
2583 | case LTTNG_DOMAIN_UST: | |
2584 | { | |
2585 | struct ltt_ust_session *usess; | |
2586 | ||
2587 | usess = session->ust_session; | |
2588 | nr_pids = trace_ust_list_tracker_pids(usess, pids); | |
2589 | if (nr_pids < 0) { | |
2590 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
2591 | goto error; | |
2592 | } | |
2593 | break; | |
2594 | } | |
2595 | case LTTNG_DOMAIN_LOG4J: | |
2596 | case LTTNG_DOMAIN_JUL: | |
2597 | case LTTNG_DOMAIN_PYTHON: | |
2598 | default: | |
2599 | ret = LTTNG_ERR_UND; | |
2600 | goto error; | |
2601 | } | |
2602 | ||
2603 | return nr_pids; | |
2604 | ||
2605 | error: | |
2606 | /* Return negative value to differentiate return code */ | |
2607 | return -ret; | |
2608 | } | |
2609 | ||
2f77fc4b DG |
2610 | /* |
2611 | * Command LTTNG_START_TRACE processed by the client thread. | |
a9ad0c8f MD |
2612 | * |
2613 | * Called with session mutex held. | |
2f77fc4b DG |
2614 | */ |
2615 | int cmd_start_trace(struct ltt_session *session) | |
2616 | { | |
82b69413 | 2617 | enum lttng_error_code ret; |
cde3e505 | 2618 | unsigned long nb_chan = 0; |
2f77fc4b DG |
2619 | struct ltt_kernel_session *ksession; |
2620 | struct ltt_ust_session *usess; | |
1f496244 JG |
2621 | const bool session_rotated_after_last_stop = |
2622 | session->rotated_after_last_stop; | |
2f77fc4b DG |
2623 | |
2624 | assert(session); | |
2625 | ||
2626 | /* Ease our life a bit ;) */ | |
2627 | ksession = session->kernel_session; | |
2628 | usess = session->ust_session; | |
2629 | ||
8382cf6f DG |
2630 | /* Is the session already started? */ |
2631 | if (session->active) { | |
f73fabfd | 2632 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
2f77fc4b DG |
2633 | goto error; |
2634 | } | |
2635 | ||
1f496244 JG |
2636 | if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING && |
2637 | !session->current_trace_chunk) { | |
2638 | /* | |
2639 | * A rotation was launched while the session was stopped and | |
2640 | * it has not been completed yet. It is not possible to start | |
2641 | * the session since starting the session here would require a | |
2642 | * rotation from "NULL" to a new trace chunk. That rotation | |
2643 | * would overlap with the ongoing rotation, which is not | |
2644 | * supported. | |
2645 | */ | |
2646 | WARN("Refusing to start session \"%s\" as a rotation launched after the last \"stop\" is still ongoing", | |
2647 | session->name); | |
2648 | ret = LTTNG_ERR_ROTATION_PENDING; | |
2649 | goto error; | |
2650 | } | |
2651 | ||
cde3e505 DG |
2652 | /* |
2653 | * Starting a session without channel is useless since after that it's not | |
2654 | * possible to enable channel thus inform the client. | |
2655 | */ | |
2656 | if (usess && usess->domain_global.channels) { | |
2657 | nb_chan += lttng_ht_get_count(usess->domain_global.channels); | |
2658 | } | |
2659 | if (ksession) { | |
2660 | nb_chan += ksession->channel_count; | |
2661 | } | |
2662 | if (!nb_chan) { | |
2663 | ret = LTTNG_ERR_NO_CHANNEL; | |
2664 | goto error; | |
2665 | } | |
2666 | ||
1f496244 JG |
2667 | session->active = 1; |
2668 | session->rotated_after_last_stop = false; | |
070b6a86 | 2669 | if (session->output_traces && !session->current_trace_chunk) { |
1f496244 JG |
2670 | if (!session->has_been_started) { |
2671 | struct lttng_trace_chunk *trace_chunk; | |
2672 | ||
2673 | DBG("Creating initial trace chunk of session \"%s\"", | |
2674 | session->name); | |
2675 | trace_chunk = session_create_new_trace_chunk( | |
2676 | session, NULL, NULL, NULL); | |
2677 | if (!trace_chunk) { | |
2678 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
2679 | goto error; | |
2680 | } | |
2681 | assert(!session->current_trace_chunk); | |
2682 | ret = session_set_trace_chunk(session, trace_chunk, | |
2683 | NULL); | |
2684 | lttng_trace_chunk_put(trace_chunk); | |
2685 | if (ret) { | |
2686 | ret = LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER; | |
2687 | goto error; | |
2688 | } | |
2689 | } else { | |
2690 | DBG("Rotating session \"%s\" from its current \"NULL\" trace chunk to a new chunk", | |
2691 | session->name); | |
2692 | /* | |
2693 | * Rotate existing streams into the new chunk. | |
2694 | * This is a "quiet" rotation has no client has | |
2695 | * explicitly requested this operation. | |
2696 | * | |
2697 | * There is also no need to wait for the rotation | |
2698 | * to complete as it will happen immediately. No data | |
2699 | * was produced as the session was stopped, so the | |
2700 | * rotation should happen on reception of the command. | |
2701 | */ | |
2702 | ret = cmd_rotate_session(session, NULL, true); | |
2703 | if (ret != LTTNG_OK) { | |
2704 | goto error; | |
2705 | } | |
5c408ad8 | 2706 | } |
c996624c JD |
2707 | } |
2708 | ||
2f77fc4b DG |
2709 | /* Kernel tracing */ |
2710 | if (ksession != NULL) { | |
c996624c | 2711 | DBG("Start kernel tracing session %s", session->name); |
7d268848 | 2712 | ret = start_kernel_session(ksession); |
9b6c7ec5 | 2713 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2714 | goto error; |
2715 | } | |
2f77fc4b DG |
2716 | } |
2717 | ||
2718 | /* Flag session that trace should start automatically */ | |
2719 | if (usess) { | |
82b69413 JG |
2720 | int int_ret = ust_app_start_trace_all(usess); |
2721 | ||
2722 | if (int_ret < 0) { | |
f73fabfd | 2723 | ret = LTTNG_ERR_UST_START_FAIL; |
2f77fc4b DG |
2724 | goto error; |
2725 | } | |
2726 | } | |
2727 | ||
5c408ad8 JD |
2728 | /* |
2729 | * Clear the flag that indicates that a rotation was done while the | |
2730 | * session was stopped. | |
2731 | */ | |
2732 | session->rotated_after_last_stop = false; | |
2733 | ||
259c2674 | 2734 | if (session->rotate_timer_period) { |
82b69413 JG |
2735 | int int_ret = timer_session_rotation_schedule_timer_start( |
2736 | session, session->rotate_timer_period); | |
2737 | ||
2738 | if (int_ret < 0) { | |
259c2674 JD |
2739 | ERR("Failed to enable rotate timer"); |
2740 | ret = LTTNG_ERR_UNK; | |
2741 | goto error; | |
2742 | } | |
2743 | } | |
2744 | ||
f73fabfd | 2745 | ret = LTTNG_OK; |
2f77fc4b DG |
2746 | |
2747 | error: | |
1f496244 JG |
2748 | if (ret == LTTNG_OK) { |
2749 | /* Flag this after a successful start. */ | |
2750 | session->has_been_started |= 1; | |
2751 | } else { | |
2752 | session->active = 0; | |
2753 | /* Restore initial state on error. */ | |
2754 | session->rotated_after_last_stop = | |
2755 | session_rotated_after_last_stop; | |
2756 | } | |
2f77fc4b DG |
2757 | return ret; |
2758 | } | |
2759 | ||
2760 | /* | |
2761 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2762 | */ | |
2763 | int cmd_stop_trace(struct ltt_session *session) | |
2764 | { | |
2765 | int ret; | |
2f77fc4b DG |
2766 | struct ltt_kernel_session *ksession; |
2767 | struct ltt_ust_session *usess; | |
2768 | ||
2769 | assert(session); | |
2770 | ||
4dbe1875 | 2771 | DBG("Begin stop session \"%s\" (id %" PRIu64 ")", session->name, session->id); |
2f77fc4b DG |
2772 | /* Short cut */ |
2773 | ksession = session->kernel_session; | |
2774 | usess = session->ust_session; | |
2775 | ||
8382cf6f DG |
2776 | /* Session is not active. Skip everythong and inform the client. */ |
2777 | if (!session->active) { | |
f73fabfd | 2778 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
2f77fc4b DG |
2779 | goto error; |
2780 | } | |
2781 | ||
4dbe1875 MD |
2782 | ret = stop_kernel_session(ksession); |
2783 | if (ret != LTTNG_OK) { | |
2784 | goto error; | |
2f77fc4b DG |
2785 | } |
2786 | ||
14fb1ebe | 2787 | if (usess && usess->active) { |
2f77fc4b DG |
2788 | ret = ust_app_stop_trace_all(usess); |
2789 | if (ret < 0) { | |
f73fabfd | 2790 | ret = LTTNG_ERR_UST_STOP_FAIL; |
2f77fc4b DG |
2791 | goto error; |
2792 | } | |
2793 | } | |
2794 | ||
4dbe1875 MD |
2795 | DBG("Completed stop session \"%s\" (id %" PRIu64 ")", session->name, |
2796 | session->id); | |
8382cf6f DG |
2797 | /* Flag inactive after a successful stop. */ |
2798 | session->active = 0; | |
4dbe1875 | 2799 | ret = LTTNG_OK; |
2f77fc4b DG |
2800 | |
2801 | error: | |
2802 | return ret; | |
2803 | } | |
2804 | ||
2805 | /* | |
433f5ba9 JR |
2806 | * Set the base_path of the session only if subdir of a control uris is set. |
2807 | * Return LTTNG_OK on success, otherwise LTTNG_ERR_*. | |
2f77fc4b | 2808 | */ |
433f5ba9 JR |
2809 | static int set_session_base_path_from_uris(struct ltt_session *session, |
2810 | size_t nb_uri, | |
bda32d56 | 2811 | struct lttng_uri *uris) |
2f77fc4b | 2812 | { |
433f5ba9 JR |
2813 | int ret; |
2814 | size_t i; | |
2f77fc4b | 2815 | |
e3876bf0 JR |
2816 | for (i = 0; i < nb_uri; i++) { |
2817 | if (uris[i].stype != LTTNG_STREAM_CONTROL || | |
2818 | uris[i].subdir[0] == '\0') { | |
2819 | /* Not interested in these URIs */ | |
2820 | continue; | |
2821 | } | |
2822 | ||
2823 | if (session->base_path != NULL) { | |
2824 | free(session->base_path); | |
2825 | session->base_path = NULL; | |
2826 | } | |
2827 | ||
2828 | /* Set session base_path */ | |
2829 | session->base_path = strdup(uris[i].subdir); | |
2830 | if (!session->base_path) { | |
433f5ba9 JR |
2831 | PERROR("Failed to copy base path \"%s\" to session \"%s\"", |
2832 | uris[i].subdir, session->name); | |
2833 | ret = LTTNG_ERR_NOMEM; | |
e3876bf0 JR |
2834 | goto error; |
2835 | } | |
433f5ba9 JR |
2836 | DBG2("Setting base path \"%s\" for session \"%s\"", |
2837 | session->base_path, session->name); | |
2838 | } | |
2839 | ret = LTTNG_OK; | |
2840 | error: | |
2841 | return ret; | |
2842 | } | |
2843 | ||
2844 | /* | |
2845 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. | |
2846 | */ | |
2847 | int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri, | |
2848 | struct lttng_uri *uris) | |
2849 | { | |
2850 | int ret, i; | |
2851 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2852 | struct ltt_ust_session *usess = session->ust_session; | |
2853 | ||
2854 | assert(session); | |
2855 | assert(uris); | |
2856 | assert(nb_uri > 0); | |
2857 | ||
2858 | /* Can't set consumer URI if the session is active. */ | |
2859 | if (session->active) { | |
2860 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; | |
2861 | goto error; | |
2862 | } | |
2863 | ||
2864 | /* | |
2865 | * Set the session base path if any. This is done inside | |
2866 | * cmd_set_consumer_uri to preserve backward compatibility of the | |
2867 | * previous session creation api vs the session descriptor api. | |
2868 | */ | |
2869 | ret = set_session_base_path_from_uris(session, nb_uri, uris); | |
2870 | if (ret != LTTNG_OK) { | |
2871 | goto error; | |
e3876bf0 JR |
2872 | } |
2873 | ||
bda32d56 | 2874 | /* Set the "global" consumer URIs */ |
2f77fc4b | 2875 | for (i = 0; i < nb_uri; i++) { |
e3876bf0 JR |
2876 | ret = add_uri_to_consumer(session, session->consumer, &uris[i], |
2877 | LTTNG_DOMAIN_NONE); | |
a74934ba | 2878 | if (ret != LTTNG_OK) { |
2f77fc4b DG |
2879 | goto error; |
2880 | } | |
2f77fc4b DG |
2881 | } |
2882 | ||
bda32d56 JG |
2883 | /* Set UST session URIs */ |
2884 | if (session->ust_session) { | |
2885 | for (i = 0; i < nb_uri; i++) { | |
b178f53e | 2886 | ret = add_uri_to_consumer(session, |
bda32d56 | 2887 | session->ust_session->consumer, |
b178f53e | 2888 | &uris[i], LTTNG_DOMAIN_UST); |
bda32d56 JG |
2889 | if (ret != LTTNG_OK) { |
2890 | goto error; | |
2891 | } | |
2892 | } | |
2893 | } | |
2894 | ||
2895 | /* Set kernel session URIs */ | |
2896 | if (session->kernel_session) { | |
2897 | for (i = 0; i < nb_uri; i++) { | |
b178f53e | 2898 | ret = add_uri_to_consumer(session, |
bda32d56 | 2899 | session->kernel_session->consumer, |
b178f53e | 2900 | &uris[i], LTTNG_DOMAIN_KERNEL); |
bda32d56 JG |
2901 | if (ret != LTTNG_OK) { |
2902 | goto error; | |
2903 | } | |
2904 | } | |
2905 | } | |
2906 | ||
7ab70fe0 DG |
2907 | /* |
2908 | * Make sure to set the session in output mode after we set URI since a | |
2909 | * session can be created without URL (thus flagged in no output mode). | |
2910 | */ | |
2911 | session->output_traces = 1; | |
2912 | if (ksess) { | |
2913 | ksess->output_traces = 1; | |
bda32d56 JG |
2914 | } |
2915 | ||
2916 | if (usess) { | |
7ab70fe0 DG |
2917 | usess->output_traces = 1; |
2918 | } | |
2919 | ||
2f77fc4b | 2920 | /* All good! */ |
f73fabfd | 2921 | ret = LTTNG_OK; |
2f77fc4b DG |
2922 | |
2923 | error: | |
2924 | return ret; | |
2925 | } | |
2926 | ||
b178f53e JG |
2927 | static |
2928 | enum lttng_error_code set_session_output_from_descriptor( | |
2929 | struct ltt_session *session, | |
2930 | const struct lttng_session_descriptor *descriptor) | |
2f77fc4b DG |
2931 | { |
2932 | int ret; | |
b178f53e JG |
2933 | enum lttng_error_code ret_code = LTTNG_OK; |
2934 | enum lttng_session_descriptor_type session_type = | |
2935 | lttng_session_descriptor_get_type(descriptor); | |
2936 | enum lttng_session_descriptor_output_type output_type = | |
2937 | lttng_session_descriptor_get_output_type(descriptor); | |
2938 | struct lttng_uri uris[2] = {}; | |
2939 | size_t uri_count = 0; | |
2940 | ||
2941 | switch (output_type) { | |
2942 | case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NONE: | |
2943 | goto end; | |
2944 | case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_LOCAL: | |
2945 | lttng_session_descriptor_get_local_output_uri(descriptor, | |
2946 | &uris[0]); | |
2947 | uri_count = 1; | |
2948 | break; | |
2949 | case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NETWORK: | |
2950 | lttng_session_descriptor_get_network_output_uris(descriptor, | |
2951 | &uris[0], &uris[1]); | |
2952 | uri_count = 2; | |
2953 | break; | |
2954 | default: | |
2955 | ret_code = LTTNG_ERR_INVALID; | |
e32d7f27 | 2956 | goto end; |
2f77fc4b DG |
2957 | } |
2958 | ||
b178f53e JG |
2959 | switch (session_type) { |
2960 | case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT: | |
2961 | { | |
2962 | struct snapshot_output *new_output = NULL; | |
2963 | ||
2964 | new_output = snapshot_output_alloc(); | |
2965 | if (!new_output) { | |
2966 | ret_code = LTTNG_ERR_NOMEM; | |
2967 | goto end; | |
2968 | } | |
2969 | ||
2970 | ret = snapshot_output_init_with_uri(session, | |
2971 | DEFAULT_SNAPSHOT_MAX_SIZE, | |
2972 | NULL, uris, uri_count, session->consumer, | |
2973 | new_output, &session->snapshot); | |
2974 | if (ret < 0) { | |
2975 | ret_code = (ret == -ENOMEM) ? | |
2976 | LTTNG_ERR_NOMEM : LTTNG_ERR_INVALID; | |
2977 | snapshot_output_destroy(new_output); | |
2978 | goto end; | |
2979 | } | |
2980 | snapshot_add_output(&session->snapshot, new_output); | |
2981 | break; | |
2982 | } | |
2983 | case LTTNG_SESSION_DESCRIPTOR_TYPE_REGULAR: | |
2984 | case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE: | |
2985 | { | |
2986 | ret_code = cmd_set_consumer_uri(session, uri_count, uris); | |
2987 | break; | |
2988 | } | |
2989 | default: | |
2990 | ret_code = LTTNG_ERR_INVALID; | |
e32d7f27 | 2991 | goto end; |
2f77fc4b | 2992 | } |
b178f53e JG |
2993 | end: |
2994 | return ret_code; | |
2995 | } | |
2996 | ||
2997 | static | |
2998 | enum lttng_error_code cmd_create_session_from_descriptor( | |
2999 | struct lttng_session_descriptor *descriptor, | |
3000 | const lttng_sock_cred *creds, | |
3001 | const char *home_path) | |
3002 | { | |
3003 | int ret; | |
3004 | enum lttng_error_code ret_code; | |
3005 | const char *session_name; | |
3006 | struct ltt_session *new_session = NULL; | |
3007 | enum lttng_session_descriptor_status descriptor_status; | |
2f77fc4b | 3008 | |
e32d7f27 | 3009 | session_lock_list(); |
b178f53e JG |
3010 | if (home_path) { |
3011 | if (*home_path != '/') { | |
3012 | ERR("Home path provided by client is not absolute"); | |
3013 | ret_code = LTTNG_ERR_INVALID; | |
3014 | goto end; | |
3015 | } | |
3016 | } | |
2f77fc4b | 3017 | |
b178f53e JG |
3018 | descriptor_status = lttng_session_descriptor_get_session_name( |
3019 | descriptor, &session_name); | |
3020 | switch (descriptor_status) { | |
3021 | case LTTNG_SESSION_DESCRIPTOR_STATUS_OK: | |
3022 | break; | |
3023 | case LTTNG_SESSION_DESCRIPTOR_STATUS_UNSET: | |
3024 | session_name = NULL; | |
3025 | break; | |
3026 | default: | |
3027 | ret_code = LTTNG_ERR_INVALID; | |
3028 | goto end; | |
3029 | } | |
e3876bf0 | 3030 | |
b178f53e | 3031 | ret_code = session_create(session_name, creds->uid, creds->gid, |
e3876bf0 | 3032 | &new_session); |
b178f53e | 3033 | if (ret_code != LTTNG_OK) { |
e32d7f27 | 3034 | goto end; |
2f77fc4b DG |
3035 | } |
3036 | ||
b178f53e JG |
3037 | if (!session_name) { |
3038 | ret = lttng_session_descriptor_set_session_name(descriptor, | |
3039 | new_session->name); | |
3040 | if (ret) { | |
3041 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
3042 | goto end; | |
3043 | } | |
3044 | } | |
3045 | ||
3046 | if (!lttng_session_descriptor_is_output_destination_initialized( | |
3047 | descriptor)) { | |
3048 | /* | |
3049 | * Only include the session's creation time in the output | |
3050 | * destination if the name of the session itself was | |
3051 | * not auto-generated. | |
3052 | */ | |
3053 | ret_code = lttng_session_descriptor_set_default_output( | |
3054 | descriptor, | |
3055 | session_name ? &new_session->creation_time : NULL, | |
3056 | home_path); | |
3057 | if (ret_code != LTTNG_OK) { | |
e32d7f27 | 3058 | goto end; |
2bba9e53 | 3059 | } |
2bba9e53 | 3060 | } else { |
b178f53e JG |
3061 | new_session->has_user_specified_directory = |
3062 | lttng_session_descriptor_has_output_directory( | |
3063 | descriptor); | |
2f77fc4b DG |
3064 | } |
3065 | ||
b178f53e JG |
3066 | switch (lttng_session_descriptor_get_type(descriptor)) { |
3067 | case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT: | |
3068 | new_session->snapshot_mode = 1; | |
3069 | break; | |
3070 | case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE: | |
3071 | new_session->live_timer = | |
3072 | lttng_session_descriptor_live_get_timer_interval( | |
3073 | descriptor); | |
3074 | break; | |
3075 | default: | |
3076 | break; | |
3077 | } | |
2f77fc4b | 3078 | |
b178f53e JG |
3079 | ret_code = set_session_output_from_descriptor(new_session, descriptor); |
3080 | if (ret_code != LTTNG_OK) { | |
3081 | goto end; | |
3082 | } | |
3083 | new_session->consumer->enabled = 1; | |
3084 | ret_code = LTTNG_OK; | |
e32d7f27 | 3085 | end: |
b178f53e JG |
3086 | /* Release reference provided by the session_create function. */ |
3087 | session_put(new_session); | |
3088 | if (ret_code != LTTNG_OK && new_session) { | |
3089 | /* Release the global reference on error. */ | |
3090 | session_destroy(new_session); | |
e32d7f27 | 3091 | } |
b178f53e JG |
3092 | session_unlock_list(); |
3093 | return ret_code; | |
2f77fc4b DG |
3094 | } |
3095 | ||
b178f53e JG |
3096 | enum lttng_error_code cmd_create_session(struct command_ctx *cmd_ctx, int sock, |
3097 | struct lttng_session_descriptor **return_descriptor) | |
27babd3a DG |
3098 | { |
3099 | int ret; | |
b178f53e JG |
3100 | size_t payload_size; |
3101 | struct lttng_dynamic_buffer payload; | |
3102 | struct lttng_buffer_view home_dir_view; | |
3103 | struct lttng_buffer_view session_descriptor_view; | |
3104 | struct lttng_session_descriptor *session_descriptor = NULL; | |
3105 | enum lttng_error_code ret_code; | |
3106 | ||
3107 | lttng_dynamic_buffer_init(&payload); | |
3108 | if (cmd_ctx->lsm->u.create_session.home_dir_size >= | |
3109 | LTTNG_PATH_MAX) { | |
3110 | ret_code = LTTNG_ERR_INVALID; | |
3111 | goto error; | |
27babd3a | 3112 | } |
b178f53e JG |
3113 | if (cmd_ctx->lsm->u.create_session.session_descriptor_size > |
3114 | LTTNG_SESSION_DESCRIPTOR_MAX_LEN) { | |
3115 | ret_code = LTTNG_ERR_INVALID; | |
3116 | goto error; | |
27babd3a DG |
3117 | } |
3118 | ||
b178f53e JG |
3119 | payload_size = cmd_ctx->lsm->u.create_session.home_dir_size + |
3120 | cmd_ctx->lsm->u.create_session.session_descriptor_size; | |
3121 | ret = lttng_dynamic_buffer_set_size(&payload, payload_size); | |
3122 | if (ret) { | |
3123 | ret_code = LTTNG_ERR_NOMEM; | |
3124 | goto error; | |
27babd3a DG |
3125 | } |
3126 | ||
b178f53e JG |
3127 | ret = lttcomm_recv_unix_sock(sock, payload.data, payload.size); |
3128 | if (ret <= 0) { | |
3129 | ERR("Reception of session descriptor failed, aborting."); | |
3130 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
3131 | goto error; | |
27babd3a DG |
3132 | } |
3133 | ||
b178f53e JG |
3134 | home_dir_view = lttng_buffer_view_from_dynamic_buffer( |
3135 | &payload, | |
3136 | 0, | |
3137 | cmd_ctx->lsm->u.create_session.home_dir_size); | |
3138 | session_descriptor_view = lttng_buffer_view_from_dynamic_buffer( | |
3139 | &payload, | |
3140 | cmd_ctx->lsm->u.create_session.home_dir_size, | |
3141 | cmd_ctx->lsm->u.create_session.session_descriptor_size); | |
27babd3a | 3142 | |
b178f53e JG |
3143 | ret = lttng_session_descriptor_create_from_buffer( |
3144 | &session_descriptor_view, &session_descriptor); | |
3145 | if (ret < 0) { | |
3146 | ERR("Failed to create session descriptor from payload of \"create session\" command"); | |
3147 | ret_code = LTTNG_ERR_INVALID; | |
3148 | goto error; | |
3149 | } | |
27babd3a | 3150 | |
b178f53e JG |
3151 | /* |
3152 | * Sets the descriptor's auto-generated properties (name, output) if | |
3153 | * needed. | |
3154 | */ | |
3155 | ret_code = cmd_create_session_from_descriptor(session_descriptor, | |
3156 | &cmd_ctx->creds, | |
3157 | home_dir_view.size ? home_dir_view.data : NULL); | |
3158 | if (ret_code != LTTNG_OK) { | |
3159 | goto error; | |
e32d7f27 | 3160 | } |
b178f53e JG |
3161 | |
3162 | ret_code = LTTNG_OK; | |
3163 | *return_descriptor = session_descriptor; | |
3164 | session_descriptor = NULL; | |
3165 | error: | |
3166 | lttng_dynamic_buffer_reset(&payload); | |
3167 | lttng_session_descriptor_destroy(session_descriptor); | |
3168 | return ret_code; | |
27babd3a DG |
3169 | } |
3170 | ||
3e3665b8 JG |
3171 | static |
3172 | void cmd_destroy_session_reply(const struct ltt_session *session, | |
3173 | void *_reply_context) | |
3174 | { | |
3175 | int ret; | |
3176 | ssize_t comm_ret; | |
3177 | const struct cmd_destroy_session_reply_context *reply_context = | |
3178 | _reply_context; | |
3179 | struct lttng_dynamic_buffer payload; | |
3180 | struct lttcomm_session_destroy_command_header cmd_header; | |
3181 | struct lttng_trace_archive_location *location = NULL; | |
3182 | struct lttcomm_lttng_msg llm = { | |
3183 | .cmd_type = LTTNG_DESTROY_SESSION, | |
3285a971 | 3184 | .ret_code = reply_context->destruction_status, |
3e3665b8 JG |
3185 | .pid = UINT32_MAX, |
3186 | .cmd_header_size = | |
3187 | sizeof(struct lttcomm_session_destroy_command_header), | |
3188 | .data_size = 0, | |
3189 | }; | |
3190 | size_t payload_size_before_location; | |
3191 | ||
3192 | lttng_dynamic_buffer_init(&payload); | |
3193 | ||
3194 | ret = lttng_dynamic_buffer_append(&payload, &llm, sizeof(llm)); | |
3195 | if (ret) { | |
3196 | ERR("Failed to append session destruction message"); | |
3197 | goto error; | |
3198 | } | |
3199 | ||
3200 | cmd_header.rotation_state = | |
3201 | (int32_t) (reply_context->implicit_rotation_on_destroy ? | |
3202 | session->rotation_state : | |
3203 | LTTNG_ROTATION_STATE_NO_ROTATION); | |
3204 | ret = lttng_dynamic_buffer_append(&payload, &cmd_header, | |
3205 | sizeof(cmd_header)); | |
3206 | if (ret) { | |
3207 | ERR("Failed to append session destruction command header"); | |
3208 | goto error; | |
3209 | } | |
3210 | ||
3211 | if (!reply_context->implicit_rotation_on_destroy) { | |
3212 | DBG("No implicit rotation performed during the destruction of session \"%s\", sending reply", | |
3213 | session->name); | |
3214 | goto send_reply; | |
3215 | } | |
3216 | if (session->rotation_state != LTTNG_ROTATION_STATE_COMPLETED) { | |
3217 | DBG("Rotation state of session \"%s\" is not \"completed\", sending session destruction reply", | |
3218 | session->name); | |
3219 | goto send_reply; | |
3220 | } | |
3221 | ||
3222 | location = session_get_trace_archive_location(session); | |
3223 | if (!location) { | |
3224 | ERR("Failed to get the location of the trace archive produced during the destruction of session \"%s\"", | |
3225 | session->name); | |
3226 | goto error; | |
3227 | } | |
3228 | ||
3229 | payload_size_before_location = payload.size; | |
3230 | comm_ret = lttng_trace_archive_location_serialize(location, | |
3231 | &payload); | |
3232 | if (comm_ret < 0) { | |
3233 | ERR("Failed to serialize the location of the trace archive produced during the destruction of session \"%s\"", | |
3234 | session->name); | |
3235 | goto error; | |
3236 | } | |
3237 | /* Update the message to indicate the location's length. */ | |
3238 | ((struct lttcomm_lttng_msg *) payload.data)->data_size = | |
3239 | payload.size - payload_size_before_location; | |
3240 | send_reply: | |
3241 | comm_ret = lttcomm_send_unix_sock(reply_context->reply_sock_fd, | |
3242 | payload.data, payload.size); | |
3243 | if (comm_ret != (ssize_t) payload.size) { | |
3244 | ERR("Failed to send result of the destruction of session \"%s\" to client", | |
3245 | session->name); | |
3246 | } | |
3247 | error: | |
3248 | ret = close(reply_context->reply_sock_fd); | |
3249 | if (ret) { | |
3250 | PERROR("Failed to close client socket in deferred session destroy reply"); | |
3251 | } | |
3252 | lttng_dynamic_buffer_reset(&payload); | |
3253 | free(_reply_context); | |
3254 | } | |
3255 | ||
2f77fc4b DG |
3256 | /* |
3257 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
a9ad0c8f MD |
3258 | * |
3259 | * Called with session lock held. | |
2f77fc4b | 3260 | */ |
e32d7f27 | 3261 | int cmd_destroy_session(struct ltt_session *session, |
3e3665b8 JG |
3262 | struct notification_thread_handle *notification_thread_handle, |
3263 | int *sock_fd) | |
2f77fc4b DG |
3264 | { |
3265 | int ret; | |
3285a971 | 3266 | enum lttng_error_code destruction_last_error = LTTNG_OK; |
3e3665b8 JG |
3267 | struct cmd_destroy_session_reply_context *reply_context = NULL; |
3268 | ||
3269 | if (sock_fd) { | |
3270 | reply_context = zmalloc(sizeof(*reply_context)); | |
3271 | if (!reply_context) { | |
3272 | ret = LTTNG_ERR_NOMEM; | |
3273 | goto end; | |
3274 | } | |
3275 | reply_context->reply_sock_fd = *sock_fd; | |
3276 | } | |
2f77fc4b DG |
3277 | |
3278 | /* Safety net */ | |
3279 | assert(session); | |
3280 | ||
3e3665b8 JG |
3281 | DBG("Begin destroy session %s (id %" PRIu64 ")", session->name, |
3282 | session->id); | |
3283 | if (session->active) { | |
3284 | DBG("Session \"%s\" is active, attempting to stop it before destroying it", | |
3285 | session->name); | |
3286 | ret = cmd_stop_trace(session); | |
3287 | if (ret != LTTNG_OK && ret != LTTNG_ERR_TRACE_ALREADY_STOPPED) { | |
3288 | /* Carry on with the destruction of the session. */ | |
3289 | ERR("Failed to stop session \"%s\" as part of its destruction: %s", | |
3290 | session->name, lttng_strerror(-ret)); | |
3285a971 | 3291 | destruction_last_error = ret; |
3e3665b8 JG |
3292 | } |
3293 | } | |
5c408ad8 | 3294 | |
92816cc3 JG |
3295 | if (session->rotation_schedule_timer_enabled) { |
3296 | if (timer_session_rotation_schedule_timer_stop( | |
3297 | session)) { | |
3298 | ERR("Failed to stop the \"rotation schedule\" timer of session %s", | |
3299 | session->name); | |
3285a971 | 3300 | destruction_last_error = LTTNG_ERR_TIMER_STOP_ERROR; |
92816cc3 | 3301 | } |
259c2674 JD |
3302 | } |
3303 | ||
90936dcf JD |
3304 | if (session->rotate_size) { |
3305 | unsubscribe_session_consumed_size_rotation(session, notification_thread_handle); | |
3306 | session->rotate_size = 0; | |
3307 | } | |
3308 | ||
d2956687 JG |
3309 | if (session->most_recent_chunk_id.is_set && |
3310 | session->most_recent_chunk_id.value != 0 && | |
b5893d8e JG |
3311 | session->current_trace_chunk && session->output_traces) { |
3312 | /* | |
3313 | * Perform a last rotation on destruction if rotations have | |
3314 | * occurred during the session's lifetime. | |
3315 | */ | |
7fdbed1c | 3316 | ret = cmd_rotate_session(session, NULL, false); |
d2956687 JG |
3317 | if (ret != LTTNG_OK) { |
3318 | ERR("Failed to perform an implicit rotation as part of the destruction of session \"%s\": %s", | |
3319 | session->name, lttng_strerror(-ret)); | |
3285a971 | 3320 | destruction_last_error = -ret; |
124473a3 | 3321 | } |
3e3665b8 JG |
3322 | if (reply_context) { |
3323 | reply_context->implicit_rotation_on_destroy = true; | |
3324 | } | |
070b6a86 | 3325 | } else if (session->has_been_started && session->current_trace_chunk) { |
7fdbed1c JG |
3326 | /* |
3327 | * The user has not triggered a session rotation. However, to | |
3328 | * ensure all data has been consumed, the session is rotated | |
3329 | * to a 'null' trace chunk before it is destroyed. | |
3330 | * | |
3331 | * This is a "quiet" rotation meaning that no notification is | |
3332 | * emitted and no renaming of the current trace chunk takes | |
3333 | * place. | |
3334 | */ | |
3335 | ret = cmd_rotate_session(session, NULL, true); | |
3336 | if (ret != LTTNG_OK) { | |
3337 | ERR("Failed to perform a quiet rotation as part of the destruction of session \"%s\": %s", | |
3338 | session->name, lttng_strerror(-ret)); | |
3285a971 | 3339 | destruction_last_error = -ret; |
7fdbed1c JG |
3340 | } |
3341 | } | |
5c408ad8 | 3342 | |
a503e1ef JG |
3343 | if (session->shm_path[0]) { |
3344 | /* | |
3345 | * When a session is created with an explicit shm_path, | |
3346 | * the consumer daemon will create its shared memory files | |
3347 | * at that location and will *not* unlink them. This is normal | |
3348 | * as the intention of that feature is to make it possible | |
3349 | * to retrieve the content of those files should a crash occur. | |
3350 | * | |
3351 | * To ensure the content of those files can be used, the | |
3352 | * sessiond daemon will replicate the content of the metadata | |
3353 | * cache in a metadata file. | |
3354 | * | |
3355 | * On clean-up, it is expected that the consumer daemon will | |
3356 | * unlink the shared memory files and that the session daemon | |
3357 | * will unlink the metadata file. Then, the session's directory | |
3358 | * in the shm path can be removed. | |
3359 | * | |
3360 | * Unfortunately, a flaw in the design of the sessiond's and | |
3361 | * consumerd's tear down of channels makes it impossible to | |
3362 | * determine when the sessiond _and_ the consumerd have both | |
3363 | * destroyed their representation of a channel. For one, the | |
3364 | * unlinking, close, and rmdir happen in deferred 'call_rcu' | |
3365 | * callbacks in both daemons. | |
3366 | * | |
3367 | * However, it is also impossible for the sessiond to know when | |
3368 | * the consumer daemon is done destroying its channel(s) since | |
3369 | * it occurs as a reaction to the closing of the channel's file | |
3370 | * descriptor. There is no resulting communication initiated | |
3371 | * from the consumerd to the sessiond to confirm that the | |
3372 | * operation is completed (and was successful). | |
3373 | * | |
3374 | * Until this is all fixed, the session daemon checks for the | |
3375 | * removal of the session's shm path which makes it possible | |
3376 | * to safely advertise a session as having been destroyed. | |
3377 | * | |
3378 | * Prior to this fix, it was not possible to reliably save | |
3379 | * a session making use of the --shm-path option, destroy it, | |
3380 | * and load it again. This is because the creation of the | |
3381 | * session would fail upon seeing the session's shm path | |
3382 | * already in existence. | |
3383 | * | |
3384 | * Note that none of the error paths in the check for the | |
3385 | * directory's existence return an error. This is normal | |
3386 | * as there isn't much that can be done. The session will | |
3387 | * be destroyed properly, except that we can't offer the | |
3388 | * guarantee that the same session can be re-created. | |
3389 | */ | |
3390 | current_completion_handler = &destroy_completion_handler.handler; | |
3391 | ret = lttng_strncpy(destroy_completion_handler.shm_path, | |
3392 | session->shm_path, | |
3393 | sizeof(destroy_completion_handler.shm_path)); | |
3394 | assert(!ret); | |
3395 | } | |
e32d7f27 JG |
3396 | |
3397 | /* | |
3398 | * The session is destroyed. However, note that the command context | |
3399 | * still holds a reference to the session, thus delaying its destruction | |
3400 | * _at least_ up to the point when that reference is released. | |
3401 | */ | |
3402 | session_destroy(session); | |
3e3665b8 | 3403 | if (reply_context) { |
3285a971 | 3404 | reply_context->destruction_status = destruction_last_error; |
3e3665b8 JG |
3405 | ret = session_add_destroy_notifier(session, |
3406 | cmd_destroy_session_reply, | |
3407 | (void *) reply_context); | |
3408 | if (ret) { | |
3409 | ret = LTTNG_ERR_FATAL; | |
3410 | goto end; | |
3411 | } else { | |
3412 | *sock_fd = -1; | |
3413 | } | |
3414 | } | |
3415 | ret = LTTNG_OK; | |
3416 | end: | |
2f77fc4b DG |
3417 | return ret; |
3418 | } | |
3419 | ||
2f77fc4b DG |
3420 | /* |
3421 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
3422 | */ | |
56a37563 JG |
3423 | int cmd_register_consumer(struct ltt_session *session, |
3424 | enum lttng_domain_type domain, const char *sock_path, | |
3425 | struct consumer_data *cdata) | |
2f77fc4b DG |
3426 | { |
3427 | int ret, sock; | |
dd81b457 | 3428 | struct consumer_socket *socket = NULL; |
2f77fc4b DG |
3429 | |
3430 | assert(session); | |
3431 | assert(cdata); | |
3432 | assert(sock_path); | |
3433 | ||
3434 | switch (domain) { | |
3435 | case LTTNG_DOMAIN_KERNEL: | |
3436 | { | |
3437 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3438 | ||
3439 | assert(ksess); | |
3440 | ||
3441 | /* Can't register a consumer if there is already one */ | |
3442 | if (ksess->consumer_fds_sent != 0) { | |
f73fabfd | 3443 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
2f77fc4b DG |
3444 | goto error; |
3445 | } | |
3446 | ||
3447 | sock = lttcomm_connect_unix_sock(sock_path); | |
3448 | if (sock < 0) { | |
f73fabfd | 3449 | ret = LTTNG_ERR_CONNECT_FAIL; |
2f77fc4b DG |
3450 | goto error; |
3451 | } | |
4ce514c4 | 3452 | cdata->cmd_sock = sock; |
2f77fc4b | 3453 | |
4ce514c4 | 3454 | socket = consumer_allocate_socket(&cdata->cmd_sock); |
2f77fc4b | 3455 | if (socket == NULL) { |
f66c074c DG |
3456 | ret = close(sock); |
3457 | if (ret < 0) { | |
3458 | PERROR("close register consumer"); | |
3459 | } | |
4ce514c4 | 3460 | cdata->cmd_sock = -1; |
f73fabfd | 3461 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
3462 | goto error; |
3463 | } | |
3464 | ||
3465 | socket->lock = zmalloc(sizeof(pthread_mutex_t)); | |
3466 | if (socket->lock == NULL) { | |
3467 | PERROR("zmalloc pthread mutex"); | |
f73fabfd | 3468 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
3469 | goto error; |
3470 | } | |
3471 | pthread_mutex_init(socket->lock, NULL); | |
3472 | socket->registered = 1; | |
3473 | ||
3474 | rcu_read_lock(); | |
3475 | consumer_add_socket(socket, ksess->consumer); | |
3476 | rcu_read_unlock(); | |
3477 | ||
3478 | pthread_mutex_lock(&cdata->pid_mutex); | |
3479 | cdata->pid = -1; | |
3480 | pthread_mutex_unlock(&cdata->pid_mutex); | |
3481 | ||
3482 | break; | |
3483 | } | |
3484 | default: | |
3485 | /* TODO: Userspace tracing */ | |
f73fabfd | 3486 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3487 | goto error; |
3488 | } | |
3489 | ||
dd81b457 | 3490 | return LTTNG_OK; |
2f77fc4b DG |
3491 | |
3492 | error: | |
dd81b457 DG |
3493 | if (socket) { |
3494 | consumer_destroy_socket(socket); | |
3495 | } | |
2f77fc4b DG |
3496 | return ret; |
3497 | } | |
3498 | ||
3499 | /* | |
3500 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
3501 | */ | |
3502 | ssize_t cmd_list_domains(struct ltt_session *session, | |
3503 | struct lttng_domain **domains) | |
3504 | { | |
3505 | int ret, index = 0; | |
3506 | ssize_t nb_dom = 0; | |
fefd409b DG |
3507 | struct agent *agt; |
3508 | struct lttng_ht_iter iter; | |
2f77fc4b DG |
3509 | |
3510 | if (session->kernel_session != NULL) { | |
3511 | DBG3("Listing domains found kernel domain"); | |
3512 | nb_dom++; | |
3513 | } | |
3514 | ||
3515 | if (session->ust_session != NULL) { | |
3516 | DBG3("Listing domains found UST global domain"); | |
3517 | nb_dom++; | |
3c6a091f | 3518 | |
e0a74f01 | 3519 | rcu_read_lock(); |
fefd409b DG |
3520 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
3521 | agt, node.node) { | |
3522 | if (agt->being_used) { | |
3523 | nb_dom++; | |
3524 | } | |
3c6a091f | 3525 | } |
e0a74f01 | 3526 | rcu_read_unlock(); |
2f77fc4b DG |
3527 | } |
3528 | ||
fa64dfb4 JG |
3529 | if (!nb_dom) { |
3530 | goto end; | |
3531 | } | |
3532 | ||
2f77fc4b DG |
3533 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
3534 | if (*domains == NULL) { | |
f73fabfd | 3535 | ret = LTTNG_ERR_FATAL; |
2f77fc4b DG |
3536 | goto error; |
3537 | } | |
3538 | ||
3539 | if (session->kernel_session != NULL) { | |
3540 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
b5edb9e8 PP |
3541 | |
3542 | /* Kernel session buffer type is always GLOBAL */ | |
3543 | (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL; | |
3544 | ||
2f77fc4b DG |
3545 | index++; |
3546 | } | |
3547 | ||
3548 | if (session->ust_session != NULL) { | |
3549 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
88c5f0d8 | 3550 | (*domains)[index].buf_type = session->ust_session->buffer_type; |
2f77fc4b | 3551 | index++; |
3c6a091f | 3552 | |
e0a74f01 | 3553 | rcu_read_lock(); |
fefd409b DG |
3554 | cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter, |
3555 | agt, node.node) { | |
3556 | if (agt->being_used) { | |
3557 | (*domains)[index].type = agt->domain; | |
3558 | (*domains)[index].buf_type = session->ust_session->buffer_type; | |
3559 | index++; | |
3560 | } | |
3c6a091f | 3561 | } |
e0a74f01 | 3562 | rcu_read_unlock(); |
2f77fc4b | 3563 | } |
fa64dfb4 | 3564 | end: |
2f77fc4b DG |
3565 | return nb_dom; |
3566 | ||
3567 | error: | |
f73fabfd DG |
3568 | /* Return negative value to differentiate return code */ |
3569 | return -ret; | |
2f77fc4b DG |
3570 | } |
3571 | ||
3572 | ||
3573 | /* | |
3574 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
3575 | */ | |
56a37563 JG |
3576 | ssize_t cmd_list_channels(enum lttng_domain_type domain, |
3577 | struct ltt_session *session, struct lttng_channel **channels) | |
2f77fc4b | 3578 | { |
53e367f9 | 3579 | ssize_t nb_chan = 0, payload_size = 0, ret; |
2f77fc4b DG |
3580 | |
3581 | switch (domain) { | |
3582 | case LTTNG_DOMAIN_KERNEL: | |
3583 | if (session->kernel_session != NULL) { | |
3584 | nb_chan = session->kernel_session->channel_count; | |
3585 | } | |
3586 | DBG3("Number of kernel channels %zd", nb_chan); | |
c7d620a2 | 3587 | if (nb_chan <= 0) { |
53e367f9 JG |
3588 | ret = -LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
3589 | goto end; | |
c7d620a2 | 3590 | } |
2f77fc4b DG |
3591 | break; |
3592 | case LTTNG_DOMAIN_UST: | |
3593 | if (session->ust_session != NULL) { | |
7ffc31a2 | 3594 | rcu_read_lock(); |
2f77fc4b | 3595 | nb_chan = lttng_ht_get_count( |
7ffc31a2 JG |
3596 | session->ust_session->domain_global.channels); |
3597 | rcu_read_unlock(); | |
2f77fc4b DG |
3598 | } |
3599 | DBG3("Number of UST global channels %zd", nb_chan); | |
ade7ce52 | 3600 | if (nb_chan < 0) { |
53e367f9 JG |
3601 | ret = -LTTNG_ERR_UST_CHAN_NOT_FOUND; |
3602 | goto end; | |
c7d620a2 | 3603 | } |
2f77fc4b DG |
3604 | break; |
3605 | default: | |
53e367f9 JG |
3606 | ret = -LTTNG_ERR_UND; |
3607 | goto end; | |
2f77fc4b DG |
3608 | } |
3609 | ||
3610 | if (nb_chan > 0) { | |
53e367f9 | 3611 | const size_t channel_size = sizeof(struct lttng_channel) + |
cf0bcb51 JG |
3612 | sizeof(struct lttng_channel_extended); |
3613 | struct lttng_channel_extended *channel_exts; | |
53e367f9 JG |
3614 | |
3615 | payload_size = nb_chan * channel_size; | |
3616 | *channels = zmalloc(payload_size); | |
2f77fc4b | 3617 | if (*channels == NULL) { |
53e367f9 JG |
3618 | ret = -LTTNG_ERR_FATAL; |
3619 | goto end; | |
2f77fc4b DG |
3620 | } |
3621 | ||
53e367f9 JG |
3622 | channel_exts = ((void *) *channels) + |
3623 | (nb_chan * sizeof(struct lttng_channel)); | |
d449df4a MD |
3624 | ret = list_lttng_channels(domain, session, *channels, channel_exts); |
3625 | if (ret != LTTNG_OK) { | |
3626 | free(*channels); | |
3627 | *channels = NULL; | |
3628 | goto end; | |
3629 | } | |
53e367f9 JG |
3630 | } else { |
3631 | *channels = NULL; | |
2f77fc4b DG |
3632 | } |
3633 | ||
53e367f9 JG |
3634 | ret = payload_size; |
3635 | end: | |
3636 | return ret; | |
2f77fc4b DG |
3637 | } |
3638 | ||
3639 | /* | |
3640 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3641 | */ | |
56a37563 JG |
3642 | ssize_t cmd_list_events(enum lttng_domain_type domain, |
3643 | struct ltt_session *session, char *channel_name, | |
b4e3ceb9 | 3644 | struct lttng_event **events, size_t *total_size) |
2f77fc4b DG |
3645 | { |
3646 | int ret = 0; | |
3647 | ssize_t nb_event = 0; | |
3648 | ||
3649 | switch (domain) { | |
3650 | case LTTNG_DOMAIN_KERNEL: | |
3651 | if (session->kernel_session != NULL) { | |
3652 | nb_event = list_lttng_kernel_events(channel_name, | |
b4e3ceb9 PP |
3653 | session->kernel_session, events, |
3654 | total_size); | |
2f77fc4b DG |
3655 | } |
3656 | break; | |
3657 | case LTTNG_DOMAIN_UST: | |
3658 | { | |
3659 | if (session->ust_session != NULL) { | |
3660 | nb_event = list_lttng_ust_global_events(channel_name, | |
b4e3ceb9 PP |
3661 | &session->ust_session->domain_global, events, |
3662 | total_size); | |
2f77fc4b DG |
3663 | } |
3664 | break; | |
3665 | } | |
5cdb6027 | 3666 | case LTTNG_DOMAIN_LOG4J: |
3c6a091f | 3667 | case LTTNG_DOMAIN_JUL: |
0e115563 | 3668 | case LTTNG_DOMAIN_PYTHON: |
3c6a091f | 3669 | if (session->ust_session) { |
fefd409b DG |
3670 | struct lttng_ht_iter iter; |
3671 | struct agent *agt; | |
3672 | ||
b11feea5 | 3673 | rcu_read_lock(); |
fefd409b DG |
3674 | cds_lfht_for_each_entry(session->ust_session->agents->ht, |
3675 | &iter.iter, agt, node.node) { | |
1dfd9906 JG |
3676 | if (agt->domain == domain) { |
3677 | nb_event = list_lttng_agent_events( | |
b4e3ceb9 PP |
3678 | agt, events, |
3679 | total_size); | |
1dfd9906 JG |
3680 | break; |
3681 | } | |
fefd409b | 3682 | } |
b11feea5 | 3683 | rcu_read_unlock(); |
3c6a091f DG |
3684 | } |
3685 | break; | |
2f77fc4b | 3686 | default: |
f73fabfd | 3687 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3688 | goto error; |
3689 | } | |
3690 | ||
f73fabfd | 3691 | return nb_event; |
2f77fc4b DG |
3692 | |
3693 | error: | |
f73fabfd DG |
3694 | /* Return negative value to differentiate return code */ |
3695 | return -ret; | |
2f77fc4b DG |
3696 | } |
3697 | ||
3698 | /* | |
3699 | * Using the session list, filled a lttng_session array to send back to the | |
3700 | * client for session listing. | |
3701 | * | |
3702 | * The session list lock MUST be acquired before calling this function. Use | |
3703 | * session_lock_list() and session_unlock_list(). | |
3704 | */ | |
b178f53e JG |
3705 | void cmd_list_lttng_sessions(struct lttng_session *sessions, |
3706 | size_t session_count, uid_t uid, gid_t gid) | |
2f77fc4b DG |
3707 | { |
3708 | int ret; | |
3709 | unsigned int i = 0; | |
3710 | struct ltt_session *session; | |
3711 | struct ltt_session_list *list = session_get_list(); | |
b178f53e JG |
3712 | struct lttng_session_extended *extended = |
3713 | (typeof(extended)) (&sessions[session_count]); | |
2f77fc4b DG |
3714 | |
3715 | DBG("Getting all available session for UID %d GID %d", | |
3716 | uid, gid); | |
3717 | /* | |
3718 | * Iterate over session list and append data after the control struct in | |
3719 | * the buffer. | |
3720 | */ | |
3721 | cds_list_for_each_entry(session, &list->head, list) { | |
e32d7f27 JG |
3722 | if (!session_get(session)) { |
3723 | continue; | |
3724 | } | |
2f77fc4b DG |
3725 | /* |
3726 | * Only list the sessions the user can control. | |
3727 | */ | |
e32d7f27 JG |
3728 | if (!session_access_ok(session, uid, gid) || |
3729 | session->destroyed) { | |
3730 | session_put(session); | |
2f77fc4b DG |
3731 | continue; |
3732 | } | |
3733 | ||
3734 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3735 | struct ltt_ust_session *usess = session->ust_session; | |
3736 | ||
3737 | if (session->consumer->type == CONSUMER_DST_NET || | |
3738 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || | |
3739 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { | |
3740 | ret = build_network_session_path(sessions[i].path, | |
dec56f6c | 3741 | sizeof(sessions[i].path), session); |
2f77fc4b | 3742 | } else { |
dec56f6c | 3743 | ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s", |
366a9222 | 3744 | session->consumer->dst.session_root_path); |
2f77fc4b DG |
3745 | } |
3746 | if (ret < 0) { | |
3747 | PERROR("snprintf session path"); | |
e32d7f27 | 3748 | session_put(session); |
2f77fc4b DG |
3749 | continue; |
3750 | } | |
3751 | ||
3752 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
3753 | sessions[i].name[NAME_MAX - 1] = '\0'; | |
8382cf6f | 3754 | sessions[i].enabled = session->active; |
2cbf8fed | 3755 | sessions[i].snapshot_mode = session->snapshot_mode; |
8960e9cd | 3756 | sessions[i].live_timer_interval = session->live_timer; |
b178f53e JG |
3757 | extended[i].creation_time.value = (uint64_t) session->creation_time; |
3758 | extended[i].creation_time.is_set = 1; | |
2f77fc4b | 3759 | i++; |
e32d7f27 | 3760 | session_put(session); |
2f77fc4b DG |
3761 | } |
3762 | } | |
3763 | ||
806e2684 | 3764 | /* |
6d805429 | 3765 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
d3f14b8a | 3766 | * ready for trace analysis (or any kind of reader) or else 1 for pending data. |
806e2684 | 3767 | */ |
6d805429 | 3768 | int cmd_data_pending(struct ltt_session *session) |
806e2684 DG |
3769 | { |
3770 | int ret; | |
3771 | struct ltt_kernel_session *ksess = session->kernel_session; | |
3772 | struct ltt_ust_session *usess = session->ust_session; | |
3773 | ||
3774 | assert(session); | |
3775 | ||
5c408ad8 JD |
3776 | DBG("Data pending for session %s", session->name); |
3777 | ||
806e2684 | 3778 | /* Session MUST be stopped to ask for data availability. */ |
8382cf6f | 3779 | if (session->active) { |
806e2684 DG |
3780 | ret = LTTNG_ERR_SESSION_STARTED; |
3781 | goto error; | |
3a89d11a DG |
3782 | } else { |
3783 | /* | |
3784 | * If stopped, just make sure we've started before else the above call | |
3785 | * will always send that there is data pending. | |
3786 | * | |
3787 | * The consumer assumes that when the data pending command is received, | |
3788 | * the trace has been started before or else no output data is written | |
3789 | * by the streams which is a condition for data pending. So, this is | |
3790 | * *VERY* important that we don't ask the consumer before a start | |
3791 | * trace. | |
3792 | */ | |
8382cf6f | 3793 | if (!session->has_been_started) { |
3a89d11a DG |
3794 | ret = 0; |
3795 | goto error; | |
3796 | } | |
806e2684 DG |
3797 | } |
3798 | ||
92816cc3 JG |
3799 | /* A rotation is still pending, we have to wait. */ |
3800 | if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) { | |
5c408ad8 JD |
3801 | DBG("Rotate still pending for session %s", session->name); |
3802 | ret = 1; | |
3803 | goto error; | |
3804 | } | |
3805 | ||
806e2684 | 3806 | if (ksess && ksess->consumer) { |
6d805429 DG |
3807 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
3808 | if (ret == 1) { | |
806e2684 DG |
3809 | /* Data is still being extracted for the kernel. */ |
3810 | goto error; | |
3811 | } | |
3812 | } | |
3813 | ||
3814 | if (usess && usess->consumer) { | |
6d805429 DG |
3815 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
3816 | if (ret == 1) { | |
806e2684 DG |
3817 | /* Data is still being extracted for the kernel. */ |
3818 | goto error; | |
3819 | } | |
3820 | } | |
3821 | ||
3822 | /* Data is ready to be read by a viewer */ | |
6d805429 | 3823 | ret = 0; |
806e2684 DG |
3824 | |
3825 | error: | |
3826 | return ret; | |
3827 | } | |
3828 | ||
6dc3064a DG |
3829 | /* |
3830 | * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library. | |
3831 | * | |
3832 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3833 | */ | |
3834 | int cmd_snapshot_add_output(struct ltt_session *session, | |
df4f5a87 | 3835 | const struct lttng_snapshot_output *output, uint32_t *id) |
6dc3064a DG |
3836 | { |
3837 | int ret; | |
3838 | struct snapshot_output *new_output; | |
3839 | ||
3840 | assert(session); | |
3841 | assert(output); | |
3842 | ||
3843 | DBG("Cmd snapshot add output for session %s", session->name); | |
3844 | ||
3845 | /* | |
903ef685 | 3846 | * Can't create an output if the session is not set in no-output mode. |
6dc3064a DG |
3847 | */ |
3848 | if (session->output_traces) { | |
903ef685 | 3849 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3850 | goto error; |
3851 | } | |
3852 | ||
54213acc JG |
3853 | if (session->has_non_mmap_channel) { |
3854 | ret = LTTNG_ERR_SNAPSHOT_UNSUPPORTED; | |
3855 | goto error; | |
3856 | } | |
3857 | ||
6dc3064a DG |
3858 | /* Only one output is allowed until we have the "tee" feature. */ |
3859 | if (session->snapshot.nb_output == 1) { | |
3860 | ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST; | |
3861 | goto error; | |
3862 | } | |
3863 | ||
3864 | new_output = snapshot_output_alloc(); | |
3865 | if (!new_output) { | |
3866 | ret = LTTNG_ERR_NOMEM; | |
3867 | goto error; | |
3868 | } | |
3869 | ||
b178f53e | 3870 | ret = snapshot_output_init(session, output->max_size, output->name, |
6dc3064a DG |
3871 | output->ctrl_url, output->data_url, session->consumer, new_output, |
3872 | &session->snapshot); | |
3873 | if (ret < 0) { | |
3874 | if (ret == -ENOMEM) { | |
3875 | ret = LTTNG_ERR_NOMEM; | |
3876 | } else { | |
3877 | ret = LTTNG_ERR_INVALID; | |
3878 | } | |
3879 | goto free_error; | |
3880 | } | |
3881 | ||
6dc3064a DG |
3882 | rcu_read_lock(); |
3883 | snapshot_add_output(&session->snapshot, new_output); | |
3884 | if (id) { | |
3885 | *id = new_output->id; | |
3886 | } | |
3887 | rcu_read_unlock(); | |
3888 | ||
3889 | return LTTNG_OK; | |
3890 | ||
3891 | free_error: | |
3892 | snapshot_output_destroy(new_output); | |
3893 | error: | |
3894 | return ret; | |
3895 | } | |
3896 | ||
3897 | /* | |
3898 | * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl. | |
3899 | * | |
3900 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
3901 | */ | |
3902 | int cmd_snapshot_del_output(struct ltt_session *session, | |
df4f5a87 | 3903 | const struct lttng_snapshot_output *output) |
6dc3064a DG |
3904 | { |
3905 | int ret; | |
eb240553 | 3906 | struct snapshot_output *sout = NULL; |
6dc3064a DG |
3907 | |
3908 | assert(session); | |
3909 | assert(output); | |
3910 | ||
6dc3064a DG |
3911 | rcu_read_lock(); |
3912 | ||
3913 | /* | |
d3f14b8a MD |
3914 | * Permission denied to create an output if the session is not |
3915 | * set in no output mode. | |
6dc3064a DG |
3916 | */ |
3917 | if (session->output_traces) { | |
903ef685 | 3918 | ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
3919 | goto error; |
3920 | } | |
3921 | ||
eb240553 DG |
3922 | if (output->id) { |
3923 | DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id, | |
3924 | session->name); | |
3925 | sout = snapshot_find_output_by_id(output->id, &session->snapshot); | |
3926 | } else if (*output->name != '\0') { | |
3927 | DBG("Cmd snapshot del output name %s for session %s", output->name, | |
3928 | session->name); | |
3929 | sout = snapshot_find_output_by_name(output->name, &session->snapshot); | |
3930 | } | |
6dc3064a DG |
3931 | if (!sout) { |
3932 | ret = LTTNG_ERR_INVALID; | |
3933 | goto error; | |
3934 | } | |
3935 | ||
3936 | snapshot_delete_output(&session->snapshot, sout); | |
3937 | snapshot_output_destroy(sout); | |
3938 | ret = LTTNG_OK; | |
3939 | ||
3940 | error: | |
3941 | rcu_read_unlock(); | |
3942 | return ret; | |
3943 | } | |
3944 | ||
3945 | /* | |
3946 | * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl. | |
3947 | * | |
3948 | * If no output is available, outputs is untouched and 0 is returned. | |
3949 | * | |
3950 | * Return the size of the newly allocated outputs or a negative LTTNG_ERR code. | |
3951 | */ | |
3952 | ssize_t cmd_snapshot_list_outputs(struct ltt_session *session, | |
3953 | struct lttng_snapshot_output **outputs) | |
3954 | { | |
3955 | int ret, idx = 0; | |
b223ca94 | 3956 | struct lttng_snapshot_output *list = NULL; |
6dc3064a DG |
3957 | struct lttng_ht_iter iter; |
3958 | struct snapshot_output *output; | |
3959 | ||
3960 | assert(session); | |
3961 | assert(outputs); | |
3962 | ||
3963 | DBG("Cmd snapshot list outputs for session %s", session->name); | |
3964 | ||
3965 | /* | |
d3f14b8a MD |
3966 | * Permission denied to create an output if the session is not |
3967 | * set in no output mode. | |
6dc3064a DG |
3968 | */ |
3969 | if (session->output_traces) { | |
903ef685 JG |
3970 | ret = -LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
3971 | goto end; | |
6dc3064a DG |
3972 | } |
3973 | ||
3974 | if (session->snapshot.nb_output == 0) { | |
3975 | ret = 0; | |
903ef685 | 3976 | goto end; |
6dc3064a DG |
3977 | } |
3978 | ||
3979 | list = zmalloc(session->snapshot.nb_output * sizeof(*list)); | |
3980 | if (!list) { | |
b223ca94 | 3981 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 3982 | goto end; |
6dc3064a DG |
3983 | } |
3984 | ||
3985 | /* Copy list from session to the new list object. */ | |
b223ca94 | 3986 | rcu_read_lock(); |
6dc3064a DG |
3987 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter, |
3988 | output, node.node) { | |
3989 | assert(output->consumer); | |
3990 | list[idx].id = output->id; | |
3991 | list[idx].max_size = output->max_size; | |
6ce22875 MD |
3992 | if (lttng_strncpy(list[idx].name, output->name, |
3993 | sizeof(list[idx].name))) { | |
3994 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 3995 | goto error; |
6ce22875 | 3996 | } |
6dc3064a | 3997 | if (output->consumer->type == CONSUMER_DST_LOCAL) { |
6ce22875 | 3998 | if (lttng_strncpy(list[idx].ctrl_url, |
366a9222 | 3999 | output->consumer->dst.session_root_path, |
6ce22875 MD |
4000 | sizeof(list[idx].ctrl_url))) { |
4001 | ret = -LTTNG_ERR_INVALID; | |
903ef685 | 4002 | goto error; |
6ce22875 | 4003 | } |
6dc3064a DG |
4004 | } else { |
4005 | /* Control URI. */ | |
4006 | ret = uri_to_str_url(&output->consumer->dst.net.control, | |
4007 | list[idx].ctrl_url, sizeof(list[idx].ctrl_url)); | |
4008 | if (ret < 0) { | |
b223ca94 | 4009 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 4010 | goto error; |
6dc3064a DG |
4011 | } |
4012 | ||
4013 | /* Data URI. */ | |
4014 | ret = uri_to_str_url(&output->consumer->dst.net.data, | |
4015 | list[idx].data_url, sizeof(list[idx].data_url)); | |
4016 | if (ret < 0) { | |
b223ca94 | 4017 | ret = -LTTNG_ERR_NOMEM; |
903ef685 | 4018 | goto error; |
6dc3064a DG |
4019 | } |
4020 | } | |
4021 | idx++; | |
4022 | } | |
4023 | ||
4024 | *outputs = list; | |
b223ca94 JG |
4025 | list = NULL; |
4026 | ret = session->snapshot.nb_output; | |
6dc3064a | 4027 | error: |
903ef685 | 4028 | rcu_read_unlock(); |
b223ca94 | 4029 | free(list); |
903ef685 | 4030 | end: |
b223ca94 | 4031 | return ret; |
6dc3064a DG |
4032 | } |
4033 | ||
93ec662e JD |
4034 | /* |
4035 | * Check if we can regenerate the metadata for this session. | |
4036 | * Only kernel, UST per-uid and non-live sessions are supported. | |
4037 | * | |
4038 | * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise. | |
4039 | */ | |
4040 | static | |
eded6438 | 4041 | int check_regenerate_metadata_support(struct ltt_session *session) |
93ec662e JD |
4042 | { |
4043 | int ret; | |
4044 | ||
4045 | assert(session); | |
4046 | ||
4047 | if (session->live_timer != 0) { | |
4048 | ret = LTTNG_ERR_LIVE_SESSION; | |
4049 | goto end; | |
4050 | } | |
4051 | if (!session->active) { | |
4052 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
4053 | goto end; | |
4054 | } | |
4055 | if (session->ust_session) { | |
4056 | switch (session->ust_session->buffer_type) { | |
4057 | case LTTNG_BUFFER_PER_UID: | |
4058 | break; | |
4059 | case LTTNG_BUFFER_PER_PID: | |
4060 | ret = LTTNG_ERR_PER_PID_SESSION; | |
4061 | goto end; | |
4062 | default: | |
4063 | assert(0); | |
4064 | ret = LTTNG_ERR_UNK; | |
4065 | goto end; | |
4066 | } | |
4067 | } | |
4068 | if (session->consumer->type == CONSUMER_DST_NET && | |
4069 | session->consumer->relay_minor_version < 8) { | |
4070 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; | |
4071 | goto end; | |
4072 | } | |
4073 | ret = 0; | |
4074 | ||
4075 | end: | |
4076 | return ret; | |
4077 | } | |
4078 | ||
7802bae3 LL |
4079 | static |
4080 | int clear_metadata_file(int fd) | |
4081 | { | |
4082 | int ret; | |
a5df8828 | 4083 | off_t lseek_ret; |
7802bae3 | 4084 | |
a5df8828 GL |
4085 | lseek_ret = lseek(fd, 0, SEEK_SET); |
4086 | if (lseek_ret < 0) { | |
7802bae3 | 4087 | PERROR("lseek"); |
a5df8828 | 4088 | ret = -1; |
7802bae3 LL |
4089 | goto end; |
4090 | } | |
4091 | ||
4092 | ret = ftruncate(fd, 0); | |
4093 | if (ret < 0) { | |
4094 | PERROR("ftruncate"); | |
4095 | goto end; | |
4096 | } | |
4097 | ||
4098 | end: | |
4099 | return ret; | |
4100 | } | |
4101 | ||
93ec662e | 4102 | static |
eded6438 | 4103 | int ust_regenerate_metadata(struct ltt_ust_session *usess) |
93ec662e JD |
4104 | { |
4105 | int ret = 0; | |
4106 | struct buffer_reg_uid *uid_reg = NULL; | |
4107 | struct buffer_reg_session *session_reg = NULL; | |
4108 | ||
4109 | rcu_read_lock(); | |
4110 | cds_list_for_each_entry(uid_reg, &usess->buffer_reg_uid_list, lnode) { | |
4111 | struct ust_registry_session *registry; | |
4112 | struct ust_registry_channel *chan; | |
4113 | struct lttng_ht_iter iter_chan; | |
4114 | ||
4115 | session_reg = uid_reg->registry; | |
4116 | registry = session_reg->reg.ust; | |
4117 | ||
4118 | pthread_mutex_lock(®istry->lock); | |
4119 | registry->metadata_len_sent = 0; | |
4120 | memset(registry->metadata, 0, registry->metadata_alloc_len); | |
4121 | registry->metadata_len = 0; | |
4122 | registry->metadata_version++; | |
7802bae3 LL |
4123 | if (registry->metadata_fd > 0) { |
4124 | /* Clear the metadata file's content. */ | |
4125 | ret = clear_metadata_file(registry->metadata_fd); | |
4126 | if (ret) { | |
4127 | pthread_mutex_unlock(®istry->lock); | |
4128 | goto end; | |
4129 | } | |
4130 | } | |
4131 | ||
93ec662e JD |
4132 | ret = ust_metadata_session_statedump(registry, NULL, |
4133 | registry->major, registry->minor); | |
4134 | if (ret) { | |
4135 | pthread_mutex_unlock(®istry->lock); | |
4136 | ERR("Failed to generate session metadata (err = %d)", | |
4137 | ret); | |
4138 | goto end; | |
4139 | } | |
4140 | cds_lfht_for_each_entry(registry->channels->ht, &iter_chan.iter, | |
4141 | chan, node.node) { | |
4142 | struct ust_registry_event *event; | |
4143 | struct lttng_ht_iter iter_event; | |
4144 | ||
4145 | ret = ust_metadata_channel_statedump(registry, chan); | |
4146 | if (ret) { | |
4147 | pthread_mutex_unlock(®istry->lock); | |
4148 | ERR("Failed to generate channel metadata " | |
4149 | "(err = %d)", ret); | |
4150 | goto end; | |
4151 | } | |
4152 | cds_lfht_for_each_entry(chan->ht->ht, &iter_event.iter, | |
4153 | event, node.node) { | |
4154 | ret = ust_metadata_event_statedump(registry, | |
4155 | chan, event); | |
4156 | if (ret) { | |
4157 | pthread_mutex_unlock(®istry->lock); | |
4158 | ERR("Failed to generate event metadata " | |
4159 | "(err = %d)", ret); | |
4160 | goto end; | |
4161 | } | |
4162 | } | |
4163 | } | |
4164 | pthread_mutex_unlock(®istry->lock); | |
4165 | } | |
4166 | ||
4167 | end: | |
4168 | rcu_read_unlock(); | |
4169 | return ret; | |
4170 | } | |
4171 | ||
4172 | /* | |
eded6438 | 4173 | * Command LTTNG_REGENERATE_METADATA from the lttng-ctl library. |
93ec662e JD |
4174 | * |
4175 | * Ask the consumer to truncate the existing metadata file(s) and | |
4176 | * then regenerate the metadata. Live and per-pid sessions are not | |
4177 | * supported and return an error. | |
4178 | * | |
4179 | * Return 0 on success or else a LTTNG_ERR code. | |
4180 | */ | |
eded6438 | 4181 | int cmd_regenerate_metadata(struct ltt_session *session) |
93ec662e JD |
4182 | { |
4183 | int ret; | |
4184 | ||
4185 | assert(session); | |
4186 | ||
eded6438 | 4187 | ret = check_regenerate_metadata_support(session); |
93ec662e JD |
4188 | if (ret) { |
4189 | goto end; | |
4190 | } | |
4191 | ||
4192 | if (session->kernel_session) { | |
eded6438 | 4193 | ret = kernctl_session_regenerate_metadata( |
93ec662e JD |
4194 | session->kernel_session->fd); |
4195 | if (ret < 0) { | |
4196 | ERR("Failed to regenerate the kernel metadata"); | |
4197 | goto end; | |
4198 | } | |
4199 | } | |
4200 | ||
4201 | if (session->ust_session) { | |
eded6438 | 4202 | ret = ust_regenerate_metadata(session->ust_session); |
93ec662e JD |
4203 | if (ret < 0) { |
4204 | ERR("Failed to regenerate the UST metadata"); | |
4205 | goto end; | |
4206 | } | |
4207 | } | |
4208 | DBG("Cmd metadata regenerate for session %s", session->name); | |
4209 | ret = LTTNG_OK; | |
4210 | ||
4211 | end: | |
4212 | return ret; | |
4213 | } | |
4214 | ||
c2561365 JD |
4215 | /* |
4216 | * Command LTTNG_REGENERATE_STATEDUMP from the lttng-ctl library. | |
4217 | * | |
4218 | * Ask the tracer to regenerate a new statedump. | |
4219 | * | |
4220 | * Return 0 on success or else a LTTNG_ERR code. | |
4221 | */ | |
4222 | int cmd_regenerate_statedump(struct ltt_session *session) | |
4223 | { | |
4224 | int ret; | |
4225 | ||
4226 | assert(session); | |
4227 | ||
4228 | if (!session->active) { | |
4229 | ret = LTTNG_ERR_SESSION_NOT_STARTED; | |
4230 | goto end; | |
4231 | } | |
c2561365 JD |
4232 | |
4233 | if (session->kernel_session) { | |
4234 | ret = kernctl_session_regenerate_statedump( | |
4235 | session->kernel_session->fd); | |
4236 | /* | |
4237 | * Currently, the statedump in kernel can only fail if out | |
4238 | * of memory. | |
4239 | */ | |
4240 | if (ret < 0) { | |
4241 | if (ret == -ENOMEM) { | |
4242 | ret = LTTNG_ERR_REGEN_STATEDUMP_NOMEM; | |
4243 | } else { | |
4244 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
4245 | } | |
4246 | ERR("Failed to regenerate the kernel statedump"); | |
4247 | goto end; | |
4248 | } | |
4249 | } | |
4250 | ||
4251 | if (session->ust_session) { | |
4252 | ret = ust_app_regenerate_statedump_all(session->ust_session); | |
4253 | /* | |
4254 | * Currently, the statedump in UST always returns 0. | |
4255 | */ | |
4256 | if (ret < 0) { | |
4257 | ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL; | |
4258 | ERR("Failed to regenerate the UST statedump"); | |
4259 | goto end; | |
4260 | } | |
4261 | } | |
4262 | DBG("Cmd regenerate statedump for session %s", session->name); | |
4263 | ret = LTTNG_OK; | |
4264 | ||
4265 | end: | |
4266 | return ret; | |
4267 | } | |
4268 | ||
b0880ae5 JG |
4269 | int cmd_register_trigger(struct command_ctx *cmd_ctx, int sock, |
4270 | struct notification_thread_handle *notification_thread) | |
4271 | { | |
4272 | int ret; | |
4273 | size_t trigger_len; | |
4274 | ssize_t sock_recv_len; | |
4275 | struct lttng_trigger *trigger = NULL; | |
4276 | struct lttng_buffer_view view; | |
4277 | struct lttng_dynamic_buffer trigger_buffer; | |
4278 | ||
4279 | lttng_dynamic_buffer_init(&trigger_buffer); | |
4280 | trigger_len = (size_t) cmd_ctx->lsm->u.trigger.length; | |
4281 | ret = lttng_dynamic_buffer_set_size(&trigger_buffer, trigger_len); | |
4282 | if (ret) { | |
4283 | ret = LTTNG_ERR_NOMEM; | |
4284 | goto end; | |
4285 | } | |
4286 | ||
4287 | sock_recv_len = lttcomm_recv_unix_sock(sock, trigger_buffer.data, | |
4288 | trigger_len); | |
4289 | if (sock_recv_len < 0 || sock_recv_len != trigger_len) { | |
4290 | ERR("Failed to receive \"register trigger\" command payload"); | |
4291 | /* TODO: should this be a new error enum ? */ | |
4292 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
4293 | goto end; | |
4294 | } | |
4295 | ||
4296 | view = lttng_buffer_view_from_dynamic_buffer(&trigger_buffer, 0, -1); | |
4297 | if (lttng_trigger_create_from_buffer(&view, &trigger) != | |
4298 | trigger_len) { | |
4299 | ERR("Invalid trigger payload received in \"register trigger\" command"); | |
4300 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
4301 | goto end; | |
4302 | } | |
4303 | ||
4304 | ret = notification_thread_command_register_trigger(notification_thread, | |
4305 | trigger); | |
587f9fd0 JG |
4306 | /* Ownership of trigger was transferred. */ |
4307 | trigger = NULL; | |
b0880ae5 | 4308 | end: |
587f9fd0 | 4309 | lttng_trigger_destroy(trigger); |
b0880ae5 JG |
4310 | lttng_dynamic_buffer_reset(&trigger_buffer); |
4311 | return ret; | |
4312 | } | |
4313 | ||
4314 | int cmd_unregister_trigger(struct command_ctx *cmd_ctx, int sock, | |
4315 | struct notification_thread_handle *notification_thread) | |
4316 | { | |
4317 | int ret; | |
4318 | size_t trigger_len; | |
4319 | ssize_t sock_recv_len; | |
4320 | struct lttng_trigger *trigger = NULL; | |
4321 | struct lttng_buffer_view view; | |
4322 | struct lttng_dynamic_buffer trigger_buffer; | |
4323 | ||
4324 | lttng_dynamic_buffer_init(&trigger_buffer); | |
4325 | trigger_len = (size_t) cmd_ctx->lsm->u.trigger.length; | |
4326 | ret = lttng_dynamic_buffer_set_size(&trigger_buffer, trigger_len); | |
4327 | if (ret) { | |
4328 | ret = LTTNG_ERR_NOMEM; | |
4329 | goto end; | |
4330 | } | |
4331 | ||
4332 | sock_recv_len = lttcomm_recv_unix_sock(sock, trigger_buffer.data, | |
4333 | trigger_len); | |
4334 | if (sock_recv_len < 0 || sock_recv_len != trigger_len) { | |
4335 | ERR("Failed to receive \"unregister trigger\" command payload"); | |
4336 | /* TODO: should this be a new error enum ? */ | |
4337 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
4338 | goto end; | |
4339 | } | |
4340 | ||
4341 | view = lttng_buffer_view_from_dynamic_buffer(&trigger_buffer, 0, -1); | |
4342 | if (lttng_trigger_create_from_buffer(&view, &trigger) != | |
4343 | trigger_len) { | |
4344 | ERR("Invalid trigger payload received in \"unregister trigger\" command"); | |
4345 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
4346 | goto end; | |
4347 | } | |
4348 | ||
4349 | ret = notification_thread_command_unregister_trigger(notification_thread, | |
4350 | trigger); | |
4351 | end: | |
587f9fd0 | 4352 | lttng_trigger_destroy(trigger); |
b0880ae5 JG |
4353 | lttng_dynamic_buffer_reset(&trigger_buffer); |
4354 | return ret; | |
4355 | } | |
4356 | ||
6dc3064a DG |
4357 | /* |
4358 | * Send relayd sockets from snapshot output to consumer. Ignore request if the | |
4359 | * snapshot output is *not* set with a remote destination. | |
4360 | * | |
9a654598 | 4361 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a | 4362 | */ |
9a654598 | 4363 | static enum lttng_error_code set_relayd_for_snapshot( |
348a81dc | 4364 | struct consumer_output *output, |
fb9a95c4 | 4365 | const struct ltt_session *session) |
6dc3064a | 4366 | { |
9a654598 | 4367 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
4368 | struct lttng_ht_iter iter; |
4369 | struct consumer_socket *socket; | |
1e791a74 | 4370 | LTTNG_OPTIONAL(uint64_t) current_chunk_id = {}; |
6fa5fe7c | 4371 | const char *base_path; |
6dc3064a | 4372 | |
348a81dc | 4373 | assert(output); |
6dc3064a DG |
4374 | assert(session); |
4375 | ||
4376 | DBG2("Set relayd object from snapshot output"); | |
4377 | ||
1e791a74 | 4378 | if (session->current_trace_chunk) { |
348a81dc JG |
4379 | enum lttng_trace_chunk_status chunk_status = |
4380 | lttng_trace_chunk_get_id( | |
4381 | session->current_trace_chunk, | |
4382 | ¤t_chunk_id.value); | |
1e791a74 | 4383 | |
348a81dc | 4384 | if (chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK) { |
1e791a74 JG |
4385 | current_chunk_id.is_set = true; |
4386 | } else { | |
4387 | ERR("Failed to get current trace chunk id"); | |
4388 | status = LTTNG_ERR_UNK; | |
4389 | goto error; | |
4390 | } | |
4391 | } | |
4392 | ||
6dc3064a | 4393 | /* Ignore if snapshot consumer output is not network. */ |
348a81dc | 4394 | if (output->type != CONSUMER_DST_NET) { |
6dc3064a DG |
4395 | goto error; |
4396 | } | |
4397 | ||
6fa5fe7c MD |
4398 | /* |
4399 | * The snapshot record URI base path overrides the session | |
4400 | * base path. | |
4401 | */ | |
4402 | if (output->dst.net.control.subdir[0] != '\0') { | |
4403 | base_path = output->dst.net.control.subdir; | |
4404 | } else { | |
4405 | base_path = session->base_path; | |
4406 | } | |
4407 | ||
6dc3064a DG |
4408 | /* |
4409 | * For each consumer socket, create and send the relayd object of the | |
4410 | * snapshot output. | |
4411 | */ | |
4412 | rcu_read_lock(); | |
348a81dc | 4413 | cds_lfht_for_each_entry(output->socks->ht, &iter.iter, |
5eecee74 | 4414 | socket, node.node) { |
ecd0f96d | 4415 | pthread_mutex_lock(socket->lock); |
9a654598 | 4416 | status = send_consumer_relayd_sockets(0, session->id, |
348a81dc | 4417 | output, socket, |
d3e2ba59 | 4418 | session->name, session->hostname, |
6fa5fe7c | 4419 | base_path, |
1e791a74 | 4420 | session->live_timer, |
db1da059 | 4421 | current_chunk_id.is_set ? ¤t_chunk_id.value : NULL, |
46ef2188 MD |
4422 | session->creation_time, |
4423 | session->name_contains_creation_time); | |
ecd0f96d | 4424 | pthread_mutex_unlock(socket->lock); |
9a654598 | 4425 | if (status != LTTNG_OK) { |
6dc3064a DG |
4426 | rcu_read_unlock(); |
4427 | goto error; | |
4428 | } | |
4429 | } | |
4430 | rcu_read_unlock(); | |
4431 | ||
4432 | error: | |
9a654598 | 4433 | return status; |
6dc3064a DG |
4434 | } |
4435 | ||
4436 | /* | |
4437 | * Record a kernel snapshot. | |
4438 | * | |
fac41e72 | 4439 | * Return LTTNG_OK on success or a LTTNG_ERR code. |
6dc3064a | 4440 | */ |
fb9a95c4 JG |
4441 | static enum lttng_error_code record_kernel_snapshot( |
4442 | struct ltt_kernel_session *ksess, | |
348a81dc | 4443 | const struct consumer_output *output, |
fb9a95c4 | 4444 | const struct ltt_session *session, |
d07ceecd | 4445 | int wait, uint64_t nb_packets_per_stream) |
6dc3064a | 4446 | { |
9a654598 | 4447 | enum lttng_error_code status; |
6dc3064a DG |
4448 | |
4449 | assert(ksess); | |
4450 | assert(output); | |
4451 | assert(session); | |
4452 | ||
348a81dc JG |
4453 | status = kernel_snapshot_record( |
4454 | ksess, output, wait, nb_packets_per_stream); | |
9a654598 | 4455 | return status; |
6dc3064a DG |
4456 | } |
4457 | ||
4458 | /* | |
4459 | * Record a UST snapshot. | |
4460 | * | |
9a654598 | 4461 | * Returns LTTNG_OK on success or a LTTNG_ERR error code. |
6dc3064a | 4462 | */ |
9a654598 | 4463 | static enum lttng_error_code record_ust_snapshot(struct ltt_ust_session *usess, |
348a81dc JG |
4464 | const struct consumer_output *output, |
4465 | const struct ltt_session *session, | |
4466 | int wait, uint64_t nb_packets_per_stream) | |
6dc3064a | 4467 | { |
9a654598 | 4468 | enum lttng_error_code status; |
6dc3064a DG |
4469 | |
4470 | assert(usess); | |
4471 | assert(output); | |
4472 | assert(session); | |
4473 | ||
348a81dc JG |
4474 | status = ust_app_snapshot_record( |
4475 | usess, output, wait, nb_packets_per_stream); | |
9a654598 | 4476 | return status; |
6dc3064a DG |
4477 | } |
4478 | ||
d07ceecd | 4479 | static |
fb9a95c4 JG |
4480 | uint64_t get_session_size_one_more_packet_per_stream( |
4481 | const struct ltt_session *session, uint64_t cur_nr_packets) | |
68808f4e | 4482 | { |
d07ceecd | 4483 | uint64_t tot_size = 0; |
68808f4e DG |
4484 | |
4485 | if (session->kernel_session) { | |
4486 | struct ltt_kernel_channel *chan; | |
fb9a95c4 JG |
4487 | const struct ltt_kernel_session *ksess = |
4488 | session->kernel_session; | |
68808f4e | 4489 | |
68808f4e | 4490 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
d07ceecd MD |
4491 | if (cur_nr_packets >= chan->channel->attr.num_subbuf) { |
4492 | /* | |
4493 | * Don't take channel into account if we | |
4494 | * already grab all its packets. | |
4495 | */ | |
4496 | continue; | |
68808f4e | 4497 | } |
d07ceecd MD |
4498 | tot_size += chan->channel->attr.subbuf_size |
4499 | * chan->stream_count; | |
68808f4e DG |
4500 | } |
4501 | } | |
4502 | ||
4503 | if (session->ust_session) { | |
fb9a95c4 | 4504 | const struct ltt_ust_session *usess = session->ust_session; |
68808f4e | 4505 | |
d07ceecd MD |
4506 | tot_size += ust_app_get_size_one_more_packet_per_stream(usess, |
4507 | cur_nr_packets); | |
68808f4e DG |
4508 | } |
4509 | ||
d07ceecd | 4510 | return tot_size; |
68808f4e DG |
4511 | } |
4512 | ||
5c786ded | 4513 | /* |
d07ceecd MD |
4514 | * Calculate the number of packets we can grab from each stream that |
4515 | * fits within the overall snapshot max size. | |
4516 | * | |
4517 | * Returns -1 on error, 0 means infinite number of packets, else > 0 is | |
4518 | * the number of packets per stream. | |
4519 | * | |
4520 | * TODO: this approach is not perfect: we consider the worse case | |
4521 | * (packet filling the sub-buffers) as an upper bound, but we could do | |
4522 | * better if we do this calculation while we actually grab the packet | |
4523 | * content: we would know how much padding we don't actually store into | |
4524 | * the file. | |
4525 | * | |
4526 | * This algorithm is currently bounded by the number of packets per | |
4527 | * stream. | |
4528 | * | |
4529 | * Since we call this algorithm before actually grabbing the data, it's | |
4530 | * an approximation: for instance, applications could appear/disappear | |
4531 | * in between this call and actually grabbing data. | |
5c786ded | 4532 | */ |
d07ceecd | 4533 | static |
fb9a95c4 JG |
4534 | int64_t get_session_nb_packets_per_stream(const struct ltt_session *session, |
4535 | uint64_t max_size) | |
5c786ded | 4536 | { |
d07ceecd MD |
4537 | int64_t size_left; |
4538 | uint64_t cur_nb_packets = 0; | |
5c786ded | 4539 | |
d07ceecd MD |
4540 | if (!max_size) { |
4541 | return 0; /* Infinite */ | |
5c786ded JD |
4542 | } |
4543 | ||
d07ceecd MD |
4544 | size_left = max_size; |
4545 | for (;;) { | |
4546 | uint64_t one_more_packet_tot_size; | |
5c786ded | 4547 | |
fb9a95c4 JG |
4548 | one_more_packet_tot_size = get_session_size_one_more_packet_per_stream( |
4549 | session, cur_nb_packets); | |
d07ceecd MD |
4550 | if (!one_more_packet_tot_size) { |
4551 | /* We are already grabbing all packets. */ | |
4552 | break; | |
4553 | } | |
4554 | size_left -= one_more_packet_tot_size; | |
4555 | if (size_left < 0) { | |
4556 | break; | |
4557 | } | |
4558 | cur_nb_packets++; | |
5c786ded | 4559 | } |
d07ceecd MD |
4560 | if (!cur_nb_packets) { |
4561 | /* Not enough room to grab one packet of each stream, error. */ | |
4562 | return -1; | |
4563 | } | |
4564 | return cur_nb_packets; | |
5c786ded JD |
4565 | } |
4566 | ||
fb9a95c4 | 4567 | static |
d2956687 | 4568 | enum lttng_error_code snapshot_record(struct ltt_session *session, |
fb9a95c4 JG |
4569 | const struct snapshot_output *snapshot_output, int wait) |
4570 | { | |
4571 | int64_t nb_packets_per_stream; | |
d2956687 | 4572 | char snapshot_chunk_name[LTTNG_NAME_MAX]; |
348a81dc JG |
4573 | int ret; |
4574 | enum lttng_error_code ret_code = LTTNG_OK; | |
d2956687 | 4575 | struct lttng_trace_chunk *snapshot_trace_chunk; |
348a81dc JG |
4576 | struct consumer_output *original_ust_consumer_output = NULL; |
4577 | struct consumer_output *original_kernel_consumer_output = NULL; | |
4578 | struct consumer_output *snapshot_ust_consumer_output = NULL; | |
4579 | struct consumer_output *snapshot_kernel_consumer_output = NULL; | |
d2956687 | 4580 | |
348a81dc | 4581 | ret = snprintf(snapshot_chunk_name, sizeof(snapshot_chunk_name), |
d2956687 JG |
4582 | "%s-%s-%" PRIu64, |
4583 | snapshot_output->name, | |
4584 | snapshot_output->datetime, | |
4585 | snapshot_output->nb_snapshot); | |
348a81dc | 4586 | if (ret < 0 || ret >= sizeof(snapshot_chunk_name)) { |
d2956687 | 4587 | ERR("Failed to format snapshot name"); |
348a81dc JG |
4588 | ret_code = LTTNG_ERR_INVALID; |
4589 | goto error; | |
d2956687 JG |
4590 | } |
4591 | DBG("Recording snapshot \"%s\" for session \"%s\" with chunk name \"%s\"", | |
4592 | snapshot_output->name, session->name, | |
4593 | snapshot_chunk_name); | |
348a81dc JG |
4594 | if (!session->kernel_session && !session->ust_session) { |
4595 | ERR("Failed to record snapshot as no channels exist"); | |
4596 | ret_code = LTTNG_ERR_NO_CHANNEL; | |
4597 | goto error; | |
4598 | } | |
4599 | ||
4600 | if (session->kernel_session) { | |
4601 | original_kernel_consumer_output = | |
4602 | session->kernel_session->consumer; | |
4603 | snapshot_kernel_consumer_output = | |
4604 | consumer_copy_output(snapshot_output->consumer); | |
3b967712 MD |
4605 | strcpy(snapshot_kernel_consumer_output->chunk_path, |
4606 | snapshot_chunk_name); | |
348a81dc JG |
4607 | ret = consumer_copy_sockets(snapshot_kernel_consumer_output, |
4608 | original_kernel_consumer_output); | |
4609 | if (ret < 0) { | |
4610 | ERR("Failed to copy consumer sockets from snapshot output configuration"); | |
4611 | ret_code = LTTNG_ERR_NOMEM; | |
4612 | goto error; | |
4613 | } | |
4614 | ret_code = set_relayd_for_snapshot( | |
4615 | snapshot_kernel_consumer_output, session); | |
4616 | if (ret_code != LTTNG_OK) { | |
4617 | ERR("Failed to setup relay daemon for kernel tracer snapshot"); | |
4618 | goto error; | |
4619 | } | |
4620 | session->kernel_session->consumer = | |
4621 | snapshot_kernel_consumer_output; | |
4622 | } | |
4623 | if (session->ust_session) { | |
4624 | original_ust_consumer_output = session->ust_session->consumer; | |
4625 | snapshot_ust_consumer_output = | |
4626 | consumer_copy_output(snapshot_output->consumer); | |
3b967712 MD |
4627 | strcpy(snapshot_ust_consumer_output->chunk_path, |
4628 | snapshot_chunk_name); | |
348a81dc JG |
4629 | ret = consumer_copy_sockets(snapshot_ust_consumer_output, |
4630 | original_ust_consumer_output); | |
4631 | if (ret < 0) { | |
4632 | ERR("Failed to copy consumer sockets from snapshot output configuration"); | |
4633 | ret_code = LTTNG_ERR_NOMEM; | |
4634 | goto error; | |
4635 | } | |
4636 | ret_code = set_relayd_for_snapshot( | |
4637 | snapshot_ust_consumer_output, session); | |
4638 | if (ret_code != LTTNG_OK) { | |
4639 | ERR("Failed to setup relay daemon for userspace tracer snapshot"); | |
4640 | goto error; | |
4641 | } | |
4642 | session->ust_session->consumer = | |
4643 | snapshot_ust_consumer_output; | |
4644 | } | |
4645 | ||
d2956687 | 4646 | snapshot_trace_chunk = session_create_new_trace_chunk(session, |
348a81dc JG |
4647 | snapshot_kernel_consumer_output ?: |
4648 | snapshot_ust_consumer_output, | |
4649 | consumer_output_get_base_path( | |
4650 | snapshot_output->consumer), | |
d2956687 JG |
4651 | snapshot_chunk_name); |
4652 | if (!snapshot_trace_chunk) { | |
348a81dc JG |
4653 | ERR("Failed to create temporary trace chunk to record a snapshot of session \"%s\"", |
4654 | session->name); | |
4655 | ret_code = LTTNG_ERR_CREATE_DIR_FAIL; | |
4656 | goto error; | |
d2956687 JG |
4657 | } |
4658 | assert(!session->current_trace_chunk); | |
4659 | ret = session_set_trace_chunk(session, snapshot_trace_chunk, NULL); | |
4660 | lttng_trace_chunk_put(snapshot_trace_chunk); | |
4661 | snapshot_trace_chunk = NULL; | |
4662 | if (ret) { | |
348a81dc JG |
4663 | ERR("Failed to set temporary trace chunk to record a snapshot of session \"%s\"", |
4664 | session->name); | |
4665 | ret_code = LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER; | |
4666 | goto error; | |
d2956687 | 4667 | } |
fb9a95c4 JG |
4668 | |
4669 | nb_packets_per_stream = get_session_nb_packets_per_stream(session, | |
4670 | snapshot_output->max_size); | |
4671 | if (nb_packets_per_stream < 0) { | |
348a81dc JG |
4672 | ret_code = LTTNG_ERR_MAX_SIZE_INVALID; |
4673 | goto error; | |
fb9a95c4 JG |
4674 | } |
4675 | ||
4676 | if (session->kernel_session) { | |
348a81dc JG |
4677 | ret_code = record_kernel_snapshot(session->kernel_session, |
4678 | snapshot_kernel_consumer_output, session, | |
fb9a95c4 | 4679 | wait, nb_packets_per_stream); |
348a81dc JG |
4680 | if (ret_code != LTTNG_OK) { |
4681 | goto error; | |
fb9a95c4 JG |
4682 | } |
4683 | } | |
4684 | ||
4685 | if (session->ust_session) { | |
348a81dc JG |
4686 | ret_code = record_ust_snapshot(session->ust_session, |
4687 | snapshot_ust_consumer_output, session, | |
fb9a95c4 | 4688 | wait, nb_packets_per_stream); |
348a81dc JG |
4689 | if (ret_code != LTTNG_OK) { |
4690 | goto error; | |
fb9a95c4 JG |
4691 | } |
4692 | } | |
d2956687 | 4693 | |
bbc4768c | 4694 | if (session_close_trace_chunk( |
ecd1a12f | 4695 | session, session->current_trace_chunk, NULL, NULL)) { |
d2956687 JG |
4696 | /* |
4697 | * Don't goto end; make sure the chunk is closed for the session | |
4698 | * to allow future snapshots. | |
4699 | */ | |
4700 | ERR("Failed to close snapshot trace chunk of session \"%s\"", | |
4701 | session->name); | |
348a81dc | 4702 | ret_code = LTTNG_ERR_CLOSE_TRACE_CHUNK_FAIL_CONSUMER; |
d2956687 JG |
4703 | } |
4704 | if (session_set_trace_chunk(session, NULL, NULL)) { | |
4705 | ERR("Failed to release the current trace chunk of session \"%s\"", | |
4706 | session->name); | |
348a81dc | 4707 | ret_code = LTTNG_ERR_UNK; |
d2956687 | 4708 | } |
348a81dc JG |
4709 | error: |
4710 | if (original_ust_consumer_output) { | |
4711 | session->ust_session->consumer = original_ust_consumer_output; | |
4712 | } | |
4713 | if (original_kernel_consumer_output) { | |
4714 | session->kernel_session->consumer = | |
4715 | original_kernel_consumer_output; | |
4716 | } | |
4717 | consumer_output_put(snapshot_ust_consumer_output); | |
4718 | consumer_output_put(snapshot_kernel_consumer_output); | |
4719 | return ret_code; | |
fb9a95c4 JG |
4720 | } |
4721 | ||
6dc3064a DG |
4722 | /* |
4723 | * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl. | |
4724 | * | |
4725 | * The wait parameter is ignored so this call always wait for the snapshot to | |
4726 | * complete before returning. | |
4727 | * | |
4728 | * Return LTTNG_OK on success or else a LTTNG_ERR code. | |
4729 | */ | |
4730 | int cmd_snapshot_record(struct ltt_session *session, | |
df4f5a87 | 4731 | const struct lttng_snapshot_output *output, int wait) |
6dc3064a | 4732 | { |
9a654598 JG |
4733 | enum lttng_error_code cmd_ret = LTTNG_OK; |
4734 | int ret; | |
00e1dfc4 | 4735 | unsigned int snapshot_success = 0; |
10ba83fe | 4736 | char datetime[16]; |
2abe7969 | 4737 | struct snapshot_output *tmp_output = NULL; |
6dc3064a DG |
4738 | |
4739 | assert(session); | |
ba45d9f0 | 4740 | assert(output); |
6dc3064a DG |
4741 | |
4742 | DBG("Cmd snapshot record for session %s", session->name); | |
4743 | ||
10ba83fe JR |
4744 | /* Get the datetime for the snapshot output directory. */ |
4745 | ret = utils_get_current_time_str("%Y%m%d-%H%M%S", datetime, | |
4746 | sizeof(datetime)); | |
4747 | if (!ret) { | |
9a654598 | 4748 | cmd_ret = LTTNG_ERR_INVALID; |
10ba83fe JR |
4749 | goto error; |
4750 | } | |
4751 | ||
6dc3064a | 4752 | /* |
d3f14b8a MD |
4753 | * Permission denied to create an output if the session is not |
4754 | * set in no output mode. | |
6dc3064a DG |
4755 | */ |
4756 | if (session->output_traces) { | |
9a654598 | 4757 | cmd_ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION; |
6dc3064a DG |
4758 | goto error; |
4759 | } | |
4760 | ||
4761 | /* The session needs to be started at least once. */ | |
8382cf6f | 4762 | if (!session->has_been_started) { |
9a654598 | 4763 | cmd_ret = LTTNG_ERR_START_SESSION_ONCE; |
6dc3064a DG |
4764 | goto error; |
4765 | } | |
4766 | ||
4767 | /* Use temporary output for the session. */ | |
ba45d9f0 | 4768 | if (*output->ctrl_url != '\0') { |
2abe7969 JG |
4769 | tmp_output = snapshot_output_alloc(); |
4770 | if (!tmp_output) { | |
4771 | cmd_ret = LTTNG_ERR_NOMEM; | |
4772 | goto error; | |
4773 | } | |
4774 | ||
b178f53e JG |
4775 | ret = snapshot_output_init(session, output->max_size, |
4776 | output->name, | |
4777 | output->ctrl_url, output->data_url, | |
4778 | session->consumer, | |
2abe7969 | 4779 | tmp_output, NULL); |
6dc3064a DG |
4780 | if (ret < 0) { |
4781 | if (ret == -ENOMEM) { | |
9a654598 | 4782 | cmd_ret = LTTNG_ERR_NOMEM; |
6dc3064a | 4783 | } else { |
9a654598 | 4784 | cmd_ret = LTTNG_ERR_INVALID; |
6dc3064a DG |
4785 | } |
4786 | goto error; | |
4787 | } | |
1bfe7328 | 4788 | /* Use the global session count for the temporary snapshot. */ |
2abe7969 | 4789 | tmp_output->nb_snapshot = session->snapshot.nb_snapshot; |
10ba83fe JR |
4790 | |
4791 | /* Use the global datetime */ | |
2abe7969 JG |
4792 | memcpy(tmp_output->datetime, datetime, sizeof(datetime)); |
4793 | cmd_ret = snapshot_record(session, tmp_output, wait); | |
fb9a95c4 | 4794 | if (cmd_ret != LTTNG_OK) { |
804c90a8 JR |
4795 | goto error; |
4796 | } | |
804c90a8 JR |
4797 | snapshot_success = 1; |
4798 | } else { | |
4799 | struct snapshot_output *sout; | |
4800 | struct lttng_ht_iter iter; | |
68808f4e | 4801 | |
804c90a8 JR |
4802 | rcu_read_lock(); |
4803 | cds_lfht_for_each_entry(session->snapshot.output_ht->ht, | |
4804 | &iter.iter, sout, node.node) { | |
2abe7969 JG |
4805 | struct snapshot_output output_copy; |
4806 | ||
804c90a8 | 4807 | /* |
2abe7969 JG |
4808 | * Make a local copy of the output and override output |
4809 | * parameters with those provided as part of the | |
4810 | * command. | |
804c90a8 | 4811 | */ |
2abe7969 | 4812 | memcpy(&output_copy, sout, sizeof(output_copy)); |
1bfe7328 | 4813 | |
804c90a8 | 4814 | if (output->max_size != (uint64_t) -1ULL) { |
2abe7969 | 4815 | output_copy.max_size = output->max_size; |
6dc3064a | 4816 | } |
d07ceecd | 4817 | |
2abe7969 JG |
4818 | output_copy.nb_snapshot = session->snapshot.nb_snapshot; |
4819 | memcpy(output_copy.datetime, datetime, | |
4820 | sizeof(datetime)); | |
6dc3064a | 4821 | |
804c90a8 JR |
4822 | /* Use temporary name. */ |
4823 | if (*output->name != '\0') { | |
2abe7969 JG |
4824 | if (lttng_strncpy(output_copy.name, |
4825 | output->name, | |
4826 | sizeof(output_copy.name))) { | |
9a654598 | 4827 | cmd_ret = LTTNG_ERR_INVALID; |
cf3e357d MD |
4828 | rcu_read_unlock(); |
4829 | goto error; | |
4830 | } | |
804c90a8 | 4831 | } |
e1986656 | 4832 | |
2abe7969 | 4833 | cmd_ret = snapshot_record(session, &output_copy, wait); |
fb9a95c4 JG |
4834 | if (cmd_ret != LTTNG_OK) { |
4835 | rcu_read_unlock(); | |
4836 | goto error; | |
6dc3064a | 4837 | } |
804c90a8 | 4838 | snapshot_success = 1; |
6dc3064a | 4839 | } |
804c90a8 | 4840 | rcu_read_unlock(); |
6dc3064a DG |
4841 | } |
4842 | ||
1bfe7328 DG |
4843 | if (snapshot_success) { |
4844 | session->snapshot.nb_snapshot++; | |
b67578cb | 4845 | } else { |
9a654598 | 4846 | cmd_ret = LTTNG_ERR_SNAPSHOT_FAIL; |
1bfe7328 DG |
4847 | } |
4848 | ||
6dc3064a | 4849 | error: |
2abe7969 JG |
4850 | if (tmp_output) { |
4851 | snapshot_output_destroy(tmp_output); | |
4852 | } | |
9a654598 | 4853 | return cmd_ret; |
6dc3064a DG |
4854 | } |
4855 | ||
d7ba1388 MD |
4856 | /* |
4857 | * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread. | |
4858 | */ | |
4859 | int cmd_set_session_shm_path(struct ltt_session *session, | |
4860 | const char *shm_path) | |
4861 | { | |
4862 | /* Safety net */ | |
4863 | assert(session); | |
4864 | ||
4865 | /* | |
4866 | * Can only set shm path before session is started. | |
4867 | */ | |
4868 | if (session->has_been_started) { | |
4869 | return LTTNG_ERR_SESSION_STARTED; | |
4870 | } | |
4871 | ||
4872 | strncpy(session->shm_path, shm_path, | |
4873 | sizeof(session->shm_path)); | |
4874 | session->shm_path[sizeof(session->shm_path) - 1] = '\0'; | |
4875 | ||
4876 | return 0; | |
4877 | } | |
4878 | ||
5c408ad8 JD |
4879 | /* |
4880 | * Command LTTNG_ROTATE_SESSION from the lttng-ctl library. | |
4881 | * | |
4882 | * Ask the consumer to rotate the session output directory. | |
4883 | * The session lock must be held. | |
4884 | * | |
d5a1b7aa | 4885 | * Returns LTTNG_OK on success or else a negative LTTng error code. |
5c408ad8 JD |
4886 | */ |
4887 | int cmd_rotate_session(struct ltt_session *session, | |
7fdbed1c JG |
4888 | struct lttng_rotate_session_return *rotate_return, |
4889 | bool quiet_rotation) | |
5c408ad8 JD |
4890 | { |
4891 | int ret; | |
d2956687 | 4892 | uint64_t ongoing_rotation_chunk_id; |
d5a1b7aa | 4893 | enum lttng_error_code cmd_ret = LTTNG_OK; |
d2956687 JG |
4894 | struct lttng_trace_chunk *chunk_being_archived = NULL; |
4895 | struct lttng_trace_chunk *new_trace_chunk = NULL; | |
4896 | enum lttng_trace_chunk_status chunk_status; | |
3156892b JG |
4897 | bool failed_to_rotate = false; |
4898 | enum lttng_error_code rotation_fail_code = LTTNG_OK; | |
5c408ad8 JD |
4899 | |
4900 | assert(session); | |
4901 | ||
4902 | if (!session->has_been_started) { | |
d5a1b7aa | 4903 | cmd_ret = LTTNG_ERR_START_SESSION_ONCE; |
d68c9a04 | 4904 | goto end; |
5c408ad8 JD |
4905 | } |
4906 | ||
d48d65e1 MD |
4907 | /* |
4908 | * Explicit rotation is not supported for live sessions. | |
4909 | * However, live sessions can perform a quiet rotation on | |
4910 | * destroy. | |
4911 | * Rotation is not supported for snapshot traces (no output). | |
4912 | */ | |
4913 | if ((!quiet_rotation && session->live_timer) || | |
4914 | !session->output_traces) { | |
d5a1b7aa | 4915 | cmd_ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE; |
d68c9a04 | 4916 | goto end; |
5c408ad8 JD |
4917 | } |
4918 | ||
d2956687 | 4919 | /* Unsupported feature in lttng-relayd before 2.11. */ |
070b6a86 | 4920 | if (!quiet_rotation && session->consumer->type == CONSUMER_DST_NET && |
5c408ad8 JD |
4921 | (session->consumer->relay_major_version == 2 && |
4922 | session->consumer->relay_minor_version < 11)) { | |
d5a1b7aa | 4923 | cmd_ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE_RELAY; |
d68c9a04 | 4924 | goto end; |
5c408ad8 JD |
4925 | } |
4926 | ||
a40a503f MD |
4927 | /* Unsupported feature in lttng-modules before 2.8 (lack of sequence number). */ |
4928 | if (session->kernel_session && !kernel_supports_ring_buffer_packet_sequence_number()) { | |
4929 | cmd_ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE_KERNEL; | |
4930 | goto end; | |
4931 | } | |
4932 | ||
92816cc3 | 4933 | if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) { |
92816cc3 JG |
4934 | DBG("Refusing to launch a rotation; a rotation is already in progress for session %s", |
4935 | session->name); | |
d5a1b7aa | 4936 | cmd_ret = LTTNG_ERR_ROTATION_PENDING; |
d68c9a04 | 4937 | goto end; |
5c408ad8 JD |
4938 | } |
4939 | ||
4940 | /* | |
4941 | * After a stop, we only allow one rotation to occur, the other ones are | |
4942 | * useless until a new start. | |
4943 | */ | |
4944 | if (session->rotated_after_last_stop) { | |
4945 | DBG("Session \"%s\" was already rotated after stop, refusing rotation", | |
4946 | session->name); | |
d5a1b7aa | 4947 | cmd_ret = LTTNG_ERR_ROTATION_MULTIPLE_AFTER_STOP; |
d68c9a04 | 4948 | goto end; |
5c408ad8 | 4949 | } |
d2956687 | 4950 | if (session->active) { |
348a81dc | 4951 | new_trace_chunk = session_create_new_trace_chunk(session, NULL, |
d2956687 JG |
4952 | NULL, NULL); |
4953 | if (!new_trace_chunk) { | |
4954 | cmd_ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
4955 | goto error; | |
5c408ad8 | 4956 | } |
d2956687 | 4957 | } |
2961f09e | 4958 | |
3156892b JG |
4959 | /* |
4960 | * The current trace chunk becomes the chunk being archived. | |
4961 | * | |
4962 | * After this point, "chunk_being_archived" must absolutely | |
4963 | * be closed on the consumer(s), otherwise it will never be | |
4964 | * cleaned-up, which will result in a leak. | |
4965 | */ | |
d2956687 JG |
4966 | ret = session_set_trace_chunk(session, new_trace_chunk, |
4967 | &chunk_being_archived); | |
4968 | if (ret) { | |
4969 | cmd_ret = LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER; | |
b178f53e JG |
4970 | goto error; |
4971 | } | |
4972 | ||
5c408ad8 | 4973 | if (session->kernel_session) { |
d5a1b7aa JG |
4974 | cmd_ret = kernel_rotate_session(session); |
4975 | if (cmd_ret != LTTNG_OK) { | |
3156892b JG |
4976 | failed_to_rotate = true; |
4977 | rotation_fail_code = cmd_ret; | |
5c408ad8 JD |
4978 | } |
4979 | } | |
4980 | if (session->ust_session) { | |
d5a1b7aa JG |
4981 | cmd_ret = ust_app_rotate_session(session); |
4982 | if (cmd_ret != LTTNG_OK) { | |
3156892b JG |
4983 | failed_to_rotate = true; |
4984 | rotation_fail_code = cmd_ret; | |
5c408ad8 | 4985 | } |
92816cc3 | 4986 | } |
17dd1232 | 4987 | |
3b61d9ee JG |
4988 | if (!session->active) { |
4989 | session->rotated_after_last_stop = true; | |
4990 | } | |
4991 | ||
4992 | if (!chunk_being_archived) { | |
4993 | DBG("Rotating session \"%s\" from a \"NULL\" trace chunk to a new trace chunk, skipping completion check", | |
4994 | session->name); | |
4995 | if (failed_to_rotate) { | |
4996 | cmd_ret = rotation_fail_code; | |
4997 | goto error; | |
4998 | } | |
4999 | cmd_ret = LTTNG_OK; | |
5000 | goto end; | |
5001 | } | |
5002 | ||
5003 | session->rotation_state = LTTNG_ROTATION_STATE_ONGOING; | |
5004 | chunk_status = lttng_trace_chunk_get_id(chunk_being_archived, | |
5005 | &ongoing_rotation_chunk_id); | |
5006 | assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); | |
5007 | ||
bbc4768c | 5008 | ret = session_close_trace_chunk(session, chunk_being_archived, |
7fdbed1c JG |
5009 | quiet_rotation ? |
5010 | NULL : | |
5011 | &((enum lttng_trace_chunk_command_type){ | |
ecd1a12f MD |
5012 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED}), |
5013 | session->last_chunk_path); | |
d2956687 JG |
5014 | if (ret) { |
5015 | cmd_ret = LTTNG_ERR_CLOSE_TRACE_CHUNK_FAIL_CONSUMER; | |
5016 | goto error; | |
5017 | } | |
5018 | ||
3156892b JG |
5019 | if (failed_to_rotate) { |
5020 | cmd_ret = rotation_fail_code; | |
5021 | goto error; | |
5022 | } | |
5023 | ||
7fdbed1c | 5024 | session->quiet_rotation = quiet_rotation; |
92816cc3 JG |
5025 | ret = timer_session_rotation_pending_check_start(session, |
5026 | DEFAULT_ROTATE_PENDING_TIMER); | |
5027 | if (ret) { | |
d5a1b7aa | 5028 | cmd_ret = LTTNG_ERR_UNK; |
2961f09e | 5029 | goto error; |
5c408ad8 JD |
5030 | } |
5031 | ||
5c408ad8 | 5032 | if (rotate_return) { |
d2956687 | 5033 | rotate_return->rotation_id = ongoing_rotation_chunk_id; |
5c408ad8 JD |
5034 | } |
5035 | ||
d2956687 JG |
5036 | session->chunk_being_archived = chunk_being_archived; |
5037 | chunk_being_archived = NULL; | |
7fdbed1c JG |
5038 | if (!quiet_rotation) { |
5039 | ret = notification_thread_command_session_rotation_ongoing( | |
5040 | notification_thread_handle, | |
5041 | session->name, session->uid, session->gid, | |
5042 | ongoing_rotation_chunk_id); | |
5043 | if (ret != LTTNG_OK) { | |
5044 | ERR("Failed to notify notification thread that a session rotation is ongoing for session %s", | |
5045 | session->name); | |
5046 | cmd_ret = ret; | |
5047 | } | |
2961f09e JG |
5048 | } |
5049 | ||
92816cc3 | 5050 | DBG("Cmd rotate session %s, archive_id %" PRIu64 " sent", |
d2956687 | 5051 | session->name, ongoing_rotation_chunk_id); |
5c408ad8 | 5052 | end: |
d2956687 JG |
5053 | lttng_trace_chunk_put(new_trace_chunk); |
5054 | lttng_trace_chunk_put(chunk_being_archived); | |
d5a1b7aa | 5055 | ret = (cmd_ret == LTTNG_OK) ? cmd_ret : -((int) cmd_ret); |
5c408ad8 | 5056 | return ret; |
2961f09e | 5057 | error: |
2961f09e | 5058 | if (session_reset_rotation_state(session, |
d2956687 | 5059 | LTTNG_ROTATION_STATE_ERROR)) { |
2961f09e JG |
5060 | ERR("Failed to reset rotation state of session \"%s\"", |
5061 | session->name); | |
5062 | } | |
5063 | goto end; | |
5c408ad8 JD |
5064 | } |
5065 | ||
5066 | /* | |
d68c9a04 | 5067 | * Command LTTNG_ROTATION_GET_INFO from the lttng-ctl library. |
5c408ad8 JD |
5068 | * |
5069 | * Check if the session has finished its rotation. | |
5070 | * | |
d2956687 | 5071 | * Return LTTNG_OK on success or else an LTTNG_ERR code. |
5c408ad8 | 5072 | */ |
d68c9a04 JD |
5073 | int cmd_rotate_get_info(struct ltt_session *session, |
5074 | struct lttng_rotation_get_info_return *info_return, | |
5075 | uint64_t rotation_id) | |
5c408ad8 | 5076 | { |
d2956687 JG |
5077 | enum lttng_error_code cmd_ret = LTTNG_OK; |
5078 | enum lttng_rotation_state rotation_state; | |
5c408ad8 | 5079 | |
d68c9a04 | 5080 | DBG("Cmd rotate_get_info session %s, rotation id %" PRIu64, session->name, |
d2956687 | 5081 | session->most_recent_chunk_id.value); |
5c408ad8 | 5082 | |
d2956687 JG |
5083 | if (session->chunk_being_archived) { |
5084 | enum lttng_trace_chunk_status chunk_status; | |
5085 | uint64_t chunk_id; | |
5086 | ||
5087 | chunk_status = lttng_trace_chunk_get_id( | |
5088 | session->chunk_being_archived, | |
5089 | &chunk_id); | |
5090 | assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); | |
5091 | ||
5092 | rotation_state = rotation_id == chunk_id ? | |
5093 | LTTNG_ROTATION_STATE_ONGOING : | |
5094 | LTTNG_ROTATION_STATE_EXPIRED; | |
5095 | } else { | |
5096 | if (session->last_archived_chunk_id.is_set && | |
5097 | rotation_id != session->last_archived_chunk_id.value) { | |
5098 | rotation_state = LTTNG_ROTATION_STATE_EXPIRED; | |
5099 | } else { | |
5100 | rotation_state = session->rotation_state; | |
5101 | } | |
5c408ad8 JD |
5102 | } |
5103 | ||
d2956687 JG |
5104 | switch (rotation_state) { |
5105 | case LTTNG_ROTATION_STATE_NO_ROTATION: | |
83ed9e90 | 5106 | DBG("Reporting that no rotation has occurred within the lifetime of session \"%s\"", |
d2956687 JG |
5107 | session->name); |
5108 | goto end; | |
5109 | case LTTNG_ROTATION_STATE_EXPIRED: | |
5110 | DBG("Reporting that the rotation state of rotation id %" PRIu64 " of session \"%s\" has expired", | |
5111 | rotation_id, session->name); | |
5112 | break; | |
d68c9a04 | 5113 | case LTTNG_ROTATION_STATE_ONGOING: |
d2956687 | 5114 | DBG("Reporting that rotation id %" PRIu64 " of session \"%s\" is still pending", |
d68c9a04 JD |
5115 | rotation_id, session->name); |
5116 | break; | |
5117 | case LTTNG_ROTATION_STATE_COMPLETED: | |
dd73d57b | 5118 | { |
d2956687 JG |
5119 | int fmt_ret; |
5120 | char *chunk_path; | |
dd73d57b JG |
5121 | char *current_tracing_path_reply; |
5122 | size_t current_tracing_path_reply_len; | |
5123 | ||
d2956687 JG |
5124 | DBG("Reporting that rotation id %" PRIu64 " of session \"%s\" is completed", |
5125 | rotation_id, session->name); | |
5126 | ||
dd73d57b JG |
5127 | switch (session_get_consumer_destination_type(session)) { |
5128 | case CONSUMER_DST_LOCAL: | |
5129 | current_tracing_path_reply = | |
5130 | info_return->location.local.absolute_path; | |
5131 | current_tracing_path_reply_len = | |
5132 | sizeof(info_return->location.local.absolute_path); | |
5133 | info_return->location_type = | |
05f8afa9 | 5134 | (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_LOCAL; |
ecd1a12f MD |
5135 | fmt_ret = asprintf(&chunk_path, |
5136 | "%s/" DEFAULT_ARCHIVED_TRACE_CHUNKS_DIRECTORY "/%s", | |
5137 | session_get_base_path(session), | |
5138 | session->last_archived_chunk_name); | |
5139 | if (fmt_ret == -1) { | |
5140 | PERROR("Failed to format the path of the last archived trace chunk"); | |
5141 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; | |
5142 | cmd_ret = LTTNG_ERR_UNK; | |
5143 | goto end; | |
5144 | } | |
dd73d57b JG |
5145 | break; |
5146 | case CONSUMER_DST_NET: | |
09cfbe47 JG |
5147 | { |
5148 | uint16_t ctrl_port, data_port; | |
5149 | ||
dd73d57b JG |
5150 | current_tracing_path_reply = |
5151 | info_return->location.relay.relative_path; | |
5152 | current_tracing_path_reply_len = | |
5153 | sizeof(info_return->location.relay.relative_path); | |
5154 | /* Currently the only supported relay protocol. */ | |
5155 | info_return->location.relay.protocol = | |
05f8afa9 | 5156 | (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_RELAY_PROTOCOL_TYPE_TCP; |
dd73d57b | 5157 | |
d2956687 | 5158 | fmt_ret = lttng_strncpy(info_return->location.relay.host, |
dd73d57b JG |
5159 | session_get_net_consumer_hostname(session), |
5160 | sizeof(info_return->location.relay.host)); | |
d2956687 JG |
5161 | if (fmt_ret) { |
5162 | ERR("Failed to copy host name to rotate_get_info reply"); | |
dd73d57b | 5163 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; |
d2956687 | 5164 | cmd_ret = LTTNG_ERR_SET_URL; |
dd73d57b JG |
5165 | goto end; |
5166 | } | |
5167 | ||
09cfbe47 JG |
5168 | session_get_net_consumer_ports(session, &ctrl_port, &data_port); |
5169 | info_return->location.relay.ports.control = ctrl_port; | |
5170 | info_return->location.relay.ports.data = data_port; | |
dd73d57b | 5171 | info_return->location_type = |
05f8afa9 | 5172 | (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_RELAY; |
ecd1a12f MD |
5173 | chunk_path = strdup(session->last_chunk_path); |
5174 | if (!chunk_path) { | |
5175 | ERR("Failed to allocate the path of the last archived trace chunk"); | |
5176 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; | |
5177 | cmd_ret = LTTNG_ERR_UNK; | |
5178 | goto end; | |
5179 | } | |
dd73d57b | 5180 | break; |
09cfbe47 | 5181 | } |
dd73d57b JG |
5182 | default: |
5183 | abort(); | |
5184 | } | |
d2956687 JG |
5185 | |
5186 | fmt_ret = lttng_strncpy(current_tracing_path_reply, | |
5187 | chunk_path, current_tracing_path_reply_len); | |
5188 | free(chunk_path); | |
5189 | if (fmt_ret) { | |
5190 | ERR("Failed to copy path of the last archived trace chunk to rotate_get_info reply"); | |
d68c9a04 | 5191 | info_return->status = LTTNG_ROTATION_STATUS_ERROR; |
d2956687 | 5192 | cmd_ret = LTTNG_ERR_UNK; |
5c408ad8 JD |
5193 | goto end; |
5194 | } | |
dd73d57b | 5195 | |
d68c9a04 | 5196 | break; |
dd73d57b | 5197 | } |
d68c9a04 | 5198 | case LTTNG_ROTATION_STATE_ERROR: |
d2956687 | 5199 | DBG("Reporting that an error occurred during rotation %" PRIu64 " of session \"%s\"", |
d68c9a04 JD |
5200 | rotation_id, session->name); |
5201 | break; | |
5202 | default: | |
5203 | abort(); | |
5c408ad8 JD |
5204 | } |
5205 | ||
d2956687 | 5206 | cmd_ret = LTTNG_OK; |
5c408ad8 | 5207 | end: |
d2956687 JG |
5208 | info_return->status = (int32_t) rotation_state; |
5209 | return cmd_ret; | |
5c408ad8 JD |
5210 | } |
5211 | ||
259c2674 JD |
5212 | /* |
5213 | * Command LTTNG_ROTATION_SET_SCHEDULE from the lttng-ctl library. | |
5214 | * | |
5215 | * Configure the automatic rotation parameters. | |
66ea93b1 JG |
5216 | * 'activate' to true means activate the rotation schedule type with 'new_value'. |
5217 | * 'activate' to false means deactivate the rotation schedule and validate that | |
5218 | * 'new_value' has the same value as the currently active value. | |
259c2674 | 5219 | * |
66ea93b1 | 5220 | * Return 0 on success or else a positive LTTNG_ERR code. |
259c2674 JD |
5221 | */ |
5222 | int cmd_rotation_set_schedule(struct ltt_session *session, | |
66ea93b1 JG |
5223 | bool activate, enum lttng_rotation_schedule_type schedule_type, |
5224 | uint64_t new_value, | |
90936dcf | 5225 | struct notification_thread_handle *notification_thread_handle) |
259c2674 JD |
5226 | { |
5227 | int ret; | |
66ea93b1 | 5228 | uint64_t *parameter_value; |
259c2674 JD |
5229 | |
5230 | assert(session); | |
5231 | ||
5232 | DBG("Cmd rotate set schedule session %s", session->name); | |
5233 | ||
92fe5ca1 | 5234 | if (session->live_timer || !session->output_traces) { |
66ea93b1 | 5235 | DBG("Failing ROTATION_SET_SCHEDULE command as the rotation feature is not available for this session"); |
259c2674 JD |
5236 | ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE; |
5237 | goto end; | |
5238 | } | |
5239 | ||
66ea93b1 JG |
5240 | switch (schedule_type) { |
5241 | case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD: | |
5242 | parameter_value = &session->rotate_size; | |
5243 | break; | |
5244 | case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC: | |
5245 | parameter_value = &session->rotate_timer_period; | |
5246 | if (new_value >= UINT_MAX) { | |
5247 | DBG("Failing ROTATION_SET_SCHEDULE command as the value requested for a periodic rotation schedule is invalid: %" PRIu64 " > %u (UINT_MAX)", | |
5248 | new_value, UINT_MAX); | |
5249 | ret = LTTNG_ERR_INVALID; | |
5250 | goto end; | |
5251 | } | |
5252 | break; | |
5253 | default: | |
5254 | WARN("Failing ROTATION_SET_SCHEDULE command on unknown schedule type"); | |
5255 | ret = LTTNG_ERR_INVALID; | |
259c2674 | 5256 | goto end; |
66ea93b1 JG |
5257 | } |
5258 | ||
5259 | /* Improper use of the API. */ | |
5260 | if (new_value == -1ULL) { | |
5261 | WARN("Failing ROTATION_SET_SCHEDULE command as the value requested is -1"); | |
5262 | ret = LTTNG_ERR_INVALID; | |
259c2674 JD |
5263 | goto end; |
5264 | } | |
5265 | ||
66ea93b1 JG |
5266 | /* |
5267 | * As indicated in struct ltt_session's comments, a value of == 0 means | |
5268 | * this schedule rotation type is not in use. | |
5269 | * | |
5270 | * Reject the command if we were asked to activate a schedule that was | |
5271 | * already active. | |
5272 | */ | |
5273 | if (activate && *parameter_value != 0) { | |
5274 | DBG("Failing ROTATION_SET_SCHEDULE (activate) command as the schedule is already active"); | |
5275 | ret = LTTNG_ERR_ROTATION_SCHEDULE_SET; | |
90936dcf | 5276 | goto end; |
66ea93b1 JG |
5277 | } |
5278 | ||
5279 | /* | |
5280 | * Reject the command if we were asked to deactivate a schedule that was | |
5281 | * not active. | |
5282 | */ | |
5283 | if (!activate && *parameter_value == 0) { | |
5284 | DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as the schedule is already inactive"); | |
5285 | ret = LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET; | |
90936dcf JD |
5286 | goto end; |
5287 | } | |
5288 | ||
66ea93b1 JG |
5289 | /* |
5290 | * Reject the command if we were asked to deactivate a schedule that | |
5291 | * doesn't exist. | |
5292 | */ | |
5293 | if (!activate && *parameter_value != new_value) { | |
5294 | DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as an inexistant schedule was provided"); | |
5295 | ret = LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET; | |
5296 | goto end; | |
5297 | } | |
259c2674 | 5298 | |
66ea93b1 JG |
5299 | *parameter_value = activate ? new_value : 0; |
5300 | ||
5301 | switch (schedule_type) { | |
5302 | case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC: | |
5303 | if (activate && session->active) { | |
5304 | /* | |
5305 | * Only start the timer if the session is active, | |
5306 | * otherwise it will be started when the session starts. | |
5307 | */ | |
92816cc3 JG |
5308 | ret = timer_session_rotation_schedule_timer_start( |
5309 | session, new_value); | |
259c2674 | 5310 | if (ret) { |
66ea93b1 | 5311 | ERR("Failed to enable session rotation timer in ROTATION_SET_SCHEDULE command"); |
259c2674 JD |
5312 | ret = LTTNG_ERR_UNK; |
5313 | goto end; | |
5314 | } | |
66ea93b1 | 5315 | } else { |
92816cc3 JG |
5316 | ret = timer_session_rotation_schedule_timer_stop( |
5317 | session); | |
66ea93b1 JG |
5318 | if (ret) { |
5319 | ERR("Failed to disable session rotation timer in ROTATION_SET_SCHEDULE command"); | |
5320 | ret = LTTNG_ERR_UNK; | |
f3ce6946 | 5321 | goto end; |
66ea93b1 | 5322 | } |
259c2674 | 5323 | } |
66ea93b1 JG |
5324 | break; |
5325 | case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD: | |
5326 | if (activate) { | |
5327 | ret = subscribe_session_consumed_size_rotation(session, | |
5328 | new_value, notification_thread_handle); | |
90936dcf | 5329 | if (ret) { |
66ea93b1 | 5330 | ERR("Failed to enable consumed-size notification in ROTATION_SET_SCHEDULE command"); |
90936dcf JD |
5331 | ret = LTTNG_ERR_UNK; |
5332 | goto end; | |
5333 | } | |
90936dcf | 5334 | } else { |
66ea93b1 JG |
5335 | ret = unsubscribe_session_consumed_size_rotation(session, |
5336 | notification_thread_handle); | |
90936dcf | 5337 | if (ret) { |
66ea93b1 | 5338 | ERR("Failed to disable consumed-size notification in ROTATION_SET_SCHEDULE command"); |
90936dcf JD |
5339 | ret = LTTNG_ERR_UNK; |
5340 | goto end; | |
5341 | } | |
66ea93b1 | 5342 | |
90936dcf | 5343 | } |
66ea93b1 JG |
5344 | break; |
5345 | default: | |
5346 | /* Would have been caught before. */ | |
5347 | abort(); | |
90936dcf JD |
5348 | } |
5349 | ||
259c2674 JD |
5350 | ret = LTTNG_OK; |
5351 | ||
5352 | goto end; | |
5353 | ||
5354 | end: | |
5355 | return ret; | |
5356 | } | |
5357 | ||
a503e1ef JG |
5358 | /* Wait for a given path to be removed before continuing. */ |
5359 | static enum lttng_error_code wait_on_path(void *path_data) | |
5360 | { | |
5361 | const char *shm_path = path_data; | |
5362 | ||
5363 | DBG("Waiting for the shm path at %s to be removed before completing session destruction", | |
5364 | shm_path); | |
5365 | while (true) { | |
5366 | int ret; | |
5367 | struct stat st; | |
5368 | ||
5369 | ret = stat(shm_path, &st); | |
5370 | if (ret) { | |
5371 | if (errno != ENOENT) { | |
5372 | PERROR("stat() returned an error while checking for the existence of the shm path"); | |
5373 | } else { | |
5374 | DBG("shm path no longer exists, completing the destruction of session"); | |
5375 | } | |
5376 | break; | |
5377 | } else { | |
5378 | if (!S_ISDIR(st.st_mode)) { | |
5379 | ERR("The type of shm path %s returned by stat() is not a directory; aborting the wait for shm path removal", | |
5380 | shm_path); | |
5381 | break; | |
5382 | } | |
5383 | } | |
5384 | usleep(SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US); | |
5385 | } | |
5386 | return LTTNG_OK; | |
5387 | } | |
5388 | ||
5389 | /* | |
5390 | * Returns a pointer to a handler to run on completion of a command. | |
5391 | * Returns NULL if no handler has to be run for the last command executed. | |
5392 | */ | |
5393 | const struct cmd_completion_handler *cmd_pop_completion_handler(void) | |
5394 | { | |
5395 | struct cmd_completion_handler *handler = current_completion_handler; | |
5396 | ||
5397 | current_completion_handler = NULL; | |
5398 | return handler; | |
5399 | } | |
5400 | ||
2f77fc4b DG |
5401 | /* |
5402 | * Init command subsystem. | |
5403 | */ | |
5404 | void cmd_init(void) | |
5405 | { | |
5406 | /* | |
d88aee68 DG |
5407 | * Set network sequence index to 1 for streams to match a relayd |
5408 | * socket on the consumer side. | |
2f77fc4b | 5409 | */ |
d88aee68 DG |
5410 | pthread_mutex_lock(&relayd_net_seq_idx_lock); |
5411 | relayd_net_seq_idx = 1; | |
5412 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); | |
2f77fc4b DG |
5413 | |
5414 | DBG("Command subsystem initialized"); | |
5415 | } |