event-rule: userspace probe: rename get/set_name to get/set_event_name
[lttng-tools.git] / src / bin / lttng-sessiond / trace-kernel.c
1 /*
2 * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
3 *
4 * SPDX-License-Identifier: GPL-2.0-only
5 *
6 */
7
8 #define _LGPL_SOURCE
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <string.h>
12 #include <unistd.h>
13
14 #include <lttng/event.h>
15 #include <lttng/lttng-error.h>
16 #include <lttng/kernel-probe.h>
17 #include <lttng/userspace-probe.h>
18 #include <lttng/userspace-probe-internal.h>
19 #include <lttng/event-rule/event-rule.h>
20 #include <lttng/event-rule/event-rule-internal.h>
21 #include <lttng/event-rule/kernel-probe.h>
22 #include <lttng/event-rule/kernel-probe-internal.h>
23 #include <lttng/event-rule/syscall.h>
24 #include <lttng/event-rule/syscall-internal.h>
25 #include <lttng/event-rule/tracepoint.h>
26 #include <lttng/event-rule/tracepoint-internal.h>
27 #include <lttng/event-rule/userspace-probe-internal.h>
28 #include <common/common.h>
29 #include <common/defaults.h>
30 #include <common/trace-chunk.h>
31 #include <common/macros.h>
32
33 #include "consumer.h"
34 #include "trace-kernel.h"
35 #include "lttng-sessiond.h"
36 #include "notification-thread-commands.h"
37
38 /*
39 * Find the channel name for the given kernel session.
40 */
41 struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
42 const char *name, struct ltt_kernel_session *session)
43 {
44 struct ltt_kernel_channel *chan;
45
46 assert(session);
47 assert(name);
48
49 /*
50 * If we receive an empty string for channel name, it means the
51 * default channel name is requested.
52 */
53 if (name[0] == '\0')
54 name = DEFAULT_CHANNEL_NAME;
55
56 DBG("Trying to find channel %s", name);
57
58 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
59 if (strcmp(name, chan->channel->name) == 0) {
60 DBG("Found channel by name %s", name);
61 return chan;
62 }
63 }
64
65 return NULL;
66 }
67
68 /*
69 * Find the event for the given channel.
70 */
71 struct ltt_kernel_event *trace_kernel_find_event(
72 char *name, struct ltt_kernel_channel *channel,
73 enum lttng_event_type type,
74 struct lttng_bytecode *filter)
75 {
76 struct ltt_kernel_event *ev;
77 int found = 0;
78
79 assert(name);
80 assert(channel);
81
82 cds_list_for_each_entry(ev, &channel->events_list.head, list) {
83 if (type != LTTNG_EVENT_ALL && ev->type != type) {
84 continue;
85 }
86 if (strcmp(name, ev->event->name)) {
87 continue;
88 }
89 if ((ev->filter && !filter) || (!ev->filter && filter)) {
90 continue;
91 }
92 if (ev->filter && filter) {
93 if (ev->filter->len != filter->len ||
94 memcmp(ev->filter->data, filter->data,
95 filter->len) != 0) {
96 continue;
97 }
98 }
99 found = 1;
100 break;
101 }
102 if (found) {
103 DBG("Found event %s for channel %s", name,
104 channel->channel->name);
105 return ev;
106 } else {
107 return NULL;
108 }
109 }
110
111 /*
112 * Find the event name for the given channel.
113 */
114 struct ltt_kernel_event *trace_kernel_get_event_by_name(
115 char *name, struct ltt_kernel_channel *channel,
116 enum lttng_event_type type)
117 {
118 struct ltt_kernel_event *ev;
119 int found = 0;
120
121 assert(name);
122 assert(channel);
123
124 cds_list_for_each_entry(ev, &channel->events_list.head, list) {
125 if (type != LTTNG_EVENT_ALL && ev->type != type) {
126 continue;
127 }
128 if (strcmp(name, ev->event->name)) {
129 continue;
130 }
131 found = 1;
132 break;
133 }
134 if (found) {
135 DBG("Found event %s for channel %s", name,
136 channel->channel->name);
137 return ev;
138 } else {
139 return NULL;
140 }
141 }
142
143 /*
144 * Allocate and initialize a kernel session data structure.
145 *
146 * Return pointer to structure or NULL.
147 */
148 struct ltt_kernel_session *trace_kernel_create_session(void)
149 {
150 struct ltt_kernel_session *lks = NULL;
151
152 /* Allocate a new ltt kernel session */
153 lks = zmalloc(sizeof(struct ltt_kernel_session));
154 if (lks == NULL) {
155 PERROR("create kernel session zmalloc");
156 goto alloc_error;
157 }
158
159 /* Init data structure */
160 lks->fd = -1;
161 lks->metadata_stream_fd = -1;
162 lks->channel_count = 0;
163 lks->stream_count_global = 0;
164 lks->metadata = NULL;
165 CDS_INIT_LIST_HEAD(&lks->channel_list.head);
166
167 lks->tracker_pid = process_attr_tracker_create();
168 if (!lks->tracker_pid) {
169 goto error;
170 }
171 lks->tracker_vpid = process_attr_tracker_create();
172 if (!lks->tracker_vpid) {
173 goto error;
174 }
175 lks->tracker_uid = process_attr_tracker_create();
176 if (!lks->tracker_uid) {
177 goto error;
178 }
179 lks->tracker_vuid = process_attr_tracker_create();
180 if (!lks->tracker_vuid) {
181 goto error;
182 }
183 lks->tracker_gid = process_attr_tracker_create();
184 if (!lks->tracker_gid) {
185 goto error;
186 }
187 lks->tracker_vgid = process_attr_tracker_create();
188 if (!lks->tracker_vgid) {
189 goto error;
190 }
191 lks->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
192 if (lks->consumer == NULL) {
193 goto error;
194 }
195
196 return lks;
197
198 error:
199 process_attr_tracker_destroy(lks->tracker_pid);
200 process_attr_tracker_destroy(lks->tracker_vpid);
201 process_attr_tracker_destroy(lks->tracker_uid);
202 process_attr_tracker_destroy(lks->tracker_vuid);
203 process_attr_tracker_destroy(lks->tracker_gid);
204 process_attr_tracker_destroy(lks->tracker_vgid);
205 free(lks);
206
207 alloc_error:
208 return NULL;
209 }
210
211 /*
212 * Allocate and initialize a kernel channel data structure.
213 *
214 * Return pointer to structure or NULL.
215 */
216 struct ltt_kernel_channel *trace_kernel_create_channel(
217 struct lttng_channel *chan)
218 {
219 struct ltt_kernel_channel *lkc;
220 struct lttng_channel_extended *extended = NULL;
221
222 assert(chan);
223
224 lkc = zmalloc(sizeof(struct ltt_kernel_channel));
225 if (lkc == NULL) {
226 PERROR("ltt_kernel_channel zmalloc");
227 goto error;
228 }
229
230 lkc->channel = zmalloc(sizeof(struct lttng_channel));
231 if (lkc->channel == NULL) {
232 PERROR("lttng_channel zmalloc");
233 goto error;
234 }
235
236 extended = zmalloc(sizeof(struct lttng_channel_extended));
237 if (!extended) {
238 PERROR("lttng_channel_channel zmalloc");
239 goto error;
240 }
241 memcpy(lkc->channel, chan, sizeof(struct lttng_channel));
242 memcpy(extended, chan->attr.extended.ptr, sizeof(struct lttng_channel_extended));
243 lkc->channel->attr.extended.ptr = extended;
244 extended = NULL;
245
246 /*
247 * If we receive an empty string for channel name, it means the
248 * default channel name is requested.
249 */
250 if (chan->name[0] == '\0') {
251 strncpy(lkc->channel->name, DEFAULT_CHANNEL_NAME,
252 sizeof(lkc->channel->name));
253 }
254 lkc->channel->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
255
256 lkc->fd = -1;
257 lkc->stream_count = 0;
258 lkc->event_count = 0;
259 lkc->enabled = 1;
260 lkc->published_to_notification_thread = false;
261 /* Init linked list */
262 CDS_INIT_LIST_HEAD(&lkc->events_list.head);
263 CDS_INIT_LIST_HEAD(&lkc->stream_list.head);
264 CDS_INIT_LIST_HEAD(&lkc->ctx_list);
265
266 return lkc;
267
268 error:
269 if (lkc) {
270 free(lkc->channel);
271 }
272 free(extended);
273 free(lkc);
274 return NULL;
275 }
276
277 /*
278 * Allocate and init a kernel context object.
279 *
280 * Return the allocated object or NULL on error.
281 */
282 struct ltt_kernel_context *trace_kernel_create_context(
283 struct lttng_kernel_context *ctx)
284 {
285 struct ltt_kernel_context *kctx;
286
287 kctx = zmalloc(sizeof(*kctx));
288 if (!kctx) {
289 PERROR("zmalloc kernel context");
290 goto error;
291 }
292
293 if (ctx) {
294 memcpy(&kctx->ctx, ctx, sizeof(kctx->ctx));
295 }
296 error:
297 return kctx;
298 }
299
300 /*
301 * Allocate and init a kernel context object from an existing kernel context
302 * object.
303 *
304 * Return the allocated object or NULL on error.
305 */
306 struct ltt_kernel_context *trace_kernel_copy_context(
307 struct ltt_kernel_context *kctx)
308 {
309 struct ltt_kernel_context *kctx_copy;
310
311 assert(kctx);
312 kctx_copy = zmalloc(sizeof(*kctx_copy));
313 if (!kctx_copy) {
314 PERROR("zmalloc ltt_kernel_context");
315 goto error;
316 }
317
318 memcpy(kctx_copy, kctx, sizeof(*kctx_copy));
319 memset(&kctx_copy->list, 0, sizeof(kctx_copy->list));
320
321 error:
322 return kctx_copy;
323 }
324
325 /*
326 * Allocate and initialize a kernel event. Set name and event type.
327 * We own filter_expression, and filter.
328 *
329 * Return pointer to structure or NULL.
330 */
331 enum lttng_error_code trace_kernel_create_event(
332 struct lttng_event *ev, char *filter_expression,
333 struct lttng_bytecode *filter,
334 struct ltt_kernel_event **kernel_event)
335 {
336 enum lttng_error_code ret;
337 struct lttng_kernel_event *attr;
338 struct ltt_kernel_event *local_kernel_event;
339 struct lttng_userspace_probe_location *userspace_probe_location = NULL;
340
341 assert(ev);
342
343 local_kernel_event = zmalloc(sizeof(struct ltt_kernel_event));
344 attr = zmalloc(sizeof(struct lttng_kernel_event));
345 if (local_kernel_event == NULL || attr == NULL) {
346 PERROR("kernel event zmalloc");
347 ret = LTTNG_ERR_NOMEM;
348 goto error;
349 }
350
351 switch (ev->type) {
352 case LTTNG_EVENT_PROBE:
353 attr->instrumentation = LTTNG_KERNEL_KPROBE;
354 attr->u.kprobe.addr = ev->attr.probe.addr;
355 attr->u.kprobe.offset = ev->attr.probe.offset;
356 strncpy(attr->u.kprobe.symbol_name,
357 ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
358 attr->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
359 break;
360 case LTTNG_EVENT_USERSPACE_PROBE:
361 {
362 const struct lttng_userspace_probe_location* location = NULL;
363 const struct lttng_userspace_probe_location_lookup_method *lookup = NULL;
364
365 location = lttng_event_get_userspace_probe_location(ev);
366 if (!location) {
367 ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
368 goto error;
369 }
370
371 /*
372 * From this point on, the specific term 'uprobe' is used
373 * instead of the generic 'userspace probe' because it's the
374 * technology used at the moment for this instrumentation.
375 * LTTng currently implements userspace probes using uprobes.
376 * In the interactions with the kernel tracer, we use the
377 * uprobe term.
378 */
379 attr->instrumentation = LTTNG_KERNEL_UPROBE;
380
381 lookup = lttng_userspace_probe_location_get_lookup_method(
382 location);
383 if (!lookup) {
384 ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
385 goto error;
386 }
387
388 /*
389 * From the kernel tracer's perspective, all userspace probe
390 * event types are all the same: a file and an offset.
391 */
392 switch (lttng_userspace_probe_location_lookup_method_get_type(lookup)) {
393 case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF:
394 /* Get the file descriptor on the target binary. */
395 attr->u.uprobe.fd =
396 lttng_userspace_probe_location_function_get_binary_fd(location);
397
398 /*
399 * Save a reference to the probe location used during
400 * the listing of events.
401 */
402 userspace_probe_location =
403 lttng_userspace_probe_location_copy(location);
404 break;
405 case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT:
406 /* Get the file descriptor on the target binary. */
407 attr->u.uprobe.fd =
408 lttng_userspace_probe_location_tracepoint_get_binary_fd(location);
409
410 /*
411 * Save a reference to the probe location used during the listing of
412 * events.
413 */
414 userspace_probe_location =
415 lttng_userspace_probe_location_copy(location);
416 break;
417 default:
418 DBG("Unsupported lookup method type");
419 ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
420 goto error;
421 }
422 break;
423 }
424 case LTTNG_EVENT_FUNCTION:
425 attr->instrumentation = LTTNG_KERNEL_KRETPROBE;
426 attr->u.kretprobe.addr = ev->attr.probe.addr;
427 attr->u.kretprobe.offset = ev->attr.probe.offset;
428 strncpy(attr->u.kretprobe.symbol_name,
429 ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
430 attr->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
431 break;
432 case LTTNG_EVENT_FUNCTION_ENTRY:
433 attr->instrumentation = LTTNG_KERNEL_FUNCTION;
434 strncpy(attr->u.ftrace.symbol_name,
435 ev->attr.ftrace.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
436 attr->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
437 break;
438 case LTTNG_EVENT_TRACEPOINT:
439 attr->instrumentation = LTTNG_KERNEL_TRACEPOINT;
440 break;
441 case LTTNG_EVENT_SYSCALL:
442 attr->instrumentation = LTTNG_KERNEL_SYSCALL;
443 attr->u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_ALL;
444 attr->u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRYEXIT;
445 attr->u.syscall.match = LTTNG_KERNEL_SYSCALL_MATCH_NAME;
446 break;
447 case LTTNG_EVENT_ALL:
448 attr->instrumentation = LTTNG_KERNEL_ALL;
449 break;
450 default:
451 ERR("Unknown kernel instrumentation type (%d)", ev->type);
452 ret = LTTNG_ERR_INVALID;
453 goto error;
454 }
455
456 /* Copy event name */
457 strncpy(attr->name, ev->name, LTTNG_KERNEL_SYM_NAME_LEN);
458 attr->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
459
460 /* Setting up a kernel event */
461 local_kernel_event->fd = -1;
462 local_kernel_event->event = attr;
463 local_kernel_event->enabled = 1;
464 local_kernel_event->filter_expression = filter_expression;
465 local_kernel_event->filter = filter;
466 local_kernel_event->userspace_probe_location = userspace_probe_location;
467
468 *kernel_event = local_kernel_event;
469
470 return LTTNG_OK;
471
472 error:
473 free(filter_expression);
474 free(filter);
475 free(local_kernel_event);
476 free(attr);
477 return ret;
478 }
479
480 /*
481 * Allocate and initialize a kernel token event rule.
482 *
483 * Return pointer to structure or NULL.
484 */
485 enum lttng_error_code trace_kernel_create_event_notifier_rule(
486 struct lttng_trigger *trigger,
487 uint64_t token,
488 struct ltt_kernel_event_notifier_rule **event_notifier_rule)
489 {
490 enum lttng_error_code ret = LTTNG_OK;
491 enum lttng_condition_type condition_type;
492 enum lttng_event_rule_type event_rule_type;
493 enum lttng_condition_status condition_status;
494 struct ltt_kernel_event_notifier_rule *local_kernel_token_event_rule;
495 const struct lttng_condition *condition = NULL;
496 const struct lttng_event_rule *event_rule = NULL;
497
498 assert(event_notifier_rule);
499
500 condition = lttng_trigger_get_condition(trigger);
501 assert(condition);
502
503 condition_type = lttng_condition_get_type(condition);
504 assert(condition_type == LTTNG_CONDITION_TYPE_ON_EVENT);
505
506 condition_status = lttng_condition_on_event_get_rule(
507 condition, &event_rule);
508 assert(condition_status == LTTNG_CONDITION_STATUS_OK);
509 assert(event_rule);
510
511 event_rule_type = lttng_event_rule_get_type(event_rule);
512 assert(event_rule_type != LTTNG_EVENT_RULE_TYPE_UNKNOWN);
513
514 local_kernel_token_event_rule =
515 zmalloc(sizeof(struct ltt_kernel_event_notifier_rule));
516 if (local_kernel_token_event_rule == NULL) {
517 PERROR("Failed to allocate ltt_kernel_token_event_rule structure");
518 ret = LTTNG_ERR_NOMEM;
519 goto error;
520 }
521
522 local_kernel_token_event_rule->fd = -1;
523 local_kernel_token_event_rule->enabled = 1;
524 local_kernel_token_event_rule->token = token;
525
526 /* Get the reference of the event rule. */
527 lttng_trigger_get(trigger);
528
529 local_kernel_token_event_rule->trigger = trigger;
530 /* The event rule still owns the filter and bytecode. */
531 local_kernel_token_event_rule->filter =
532 lttng_event_rule_get_filter_bytecode(event_rule);
533
534 DBG3("Created kernel event notifier rule: token = %" PRIu64,
535 local_kernel_token_event_rule->token);
536 error:
537 *event_notifier_rule = local_kernel_token_event_rule;
538 return ret;
539 }
540
541 /*
542 * Initialize a kernel trigger from an event rule.
543 */
544 enum lttng_error_code trace_kernel_init_event_notifier_from_event_rule(
545 const struct lttng_event_rule *rule,
546 struct lttng_kernel_event_notifier *kernel_event_notifier)
547 {
548 enum lttng_error_code ret_code;
549 const char *name;
550 int strncpy_ret;
551
552 switch (lttng_event_rule_get_type(rule)) {
553 case LTTNG_EVENT_RULE_TYPE_KERNEL_PROBE:
554 {
555 uint64_t address = 0, offset = 0;
556 const char *symbol_name = NULL;
557 const struct lttng_kernel_probe_location *location = NULL;
558 enum lttng_kernel_probe_location_status k_status;
559 enum lttng_event_rule_status status;
560
561 status = lttng_event_rule_kernel_probe_get_location(rule, &location);
562 if (status != LTTNG_EVENT_RULE_STATUS_OK) {
563 ret_code = LTTNG_ERR_PROBE_LOCATION_INVAL;
564 goto error;
565 }
566
567 switch (lttng_kernel_probe_location_get_type(location)) {
568 case LTTNG_KERNEL_PROBE_LOCATION_TYPE_ADDRESS:
569 {
570 k_status = lttng_kernel_probe_location_address_get_address(
571 location, &address);
572 assert(k_status == LTTNG_KERNEL_PROBE_LOCATION_STATUS_OK);
573 break;
574 }
575 case LTTNG_KERNEL_PROBE_LOCATION_TYPE_SYMBOL_OFFSET:
576 {
577 k_status = lttng_kernel_probe_location_symbol_get_offset(
578 location, &offset);
579 assert(k_status == LTTNG_KERNEL_PROBE_LOCATION_STATUS_OK);
580 symbol_name = lttng_kernel_probe_location_symbol_get_name(
581 location);
582 break;
583 }
584 default:
585 abort();
586 }
587
588 kernel_event_notifier->event.instrumentation = LTTNG_KERNEL_KPROBE;
589 kernel_event_notifier->event.u.kprobe.addr = address;
590 kernel_event_notifier->event.u.kprobe.offset = offset;
591 if (symbol_name) {
592 strncpy_ret = lttng_strncpy(
593 kernel_event_notifier->event.u.kprobe.symbol_name,
594 symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
595
596 if (strncpy_ret) {
597 ret_code = LTTNG_ERR_INVALID;
598 goto error;
599 }
600 }
601
602 kernel_event_notifier->event.u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
603
604 status = lttng_event_rule_kernel_probe_get_event_name(rule, &name);
605 assert(status == LTTNG_EVENT_RULE_STATUS_OK);
606 ret_code = LTTNG_OK;
607 break;
608 }
609 case LTTNG_EVENT_RULE_TYPE_USERSPACE_PROBE:
610 {
611 const struct lttng_userspace_probe_location* location = NULL;
612 const struct lttng_userspace_probe_location_lookup_method *lookup = NULL;
613 enum lttng_event_rule_status status;
614
615 status = lttng_event_rule_userspace_probe_get_location(rule, &location);
616 if (status != LTTNG_EVENT_RULE_STATUS_OK) {
617 ret_code = LTTNG_ERR_PROBE_LOCATION_INVAL;
618 goto error;
619 }
620
621 kernel_event_notifier->event.instrumentation = LTTNG_KERNEL_UPROBE;
622
623 lookup = lttng_userspace_probe_location_get_lookup_method(
624 location);
625 if (!lookup) {
626 ret_code = LTTNG_ERR_PROBE_LOCATION_INVAL;
627 goto error;
628 }
629
630 /*
631 * From the kernel tracer's perspective, all userspace probe
632 * event types are all the same: a file and an offset.
633 */
634 switch (lttng_userspace_probe_location_lookup_method_get_type(lookup)) {
635 case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF:
636 /* Get the file descriptor on the target binary. */
637 kernel_event_notifier->event.u.uprobe.fd =
638 lttng_userspace_probe_location_function_get_binary_fd(location);
639
640 break;
641 case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT:
642 /* Get the file descriptor on the target binary. */
643 kernel_event_notifier->event.u.uprobe.fd =
644 lttng_userspace_probe_location_tracepoint_get_binary_fd(location);
645 break;
646 default:
647 abort();
648 }
649
650 status = lttng_event_rule_userspace_probe_get_event_name(
651 rule, &name);
652 assert(status == LTTNG_EVENT_RULE_STATUS_OK);
653 ret_code = LTTNG_OK;
654 break;
655 }
656 case LTTNG_EVENT_RULE_TYPE_TRACEPOINT:
657 {
658 const enum lttng_domain_type domain =
659 lttng_event_rule_get_domain_type(rule);
660 const enum lttng_event_rule_status status =
661 lttng_event_rule_tracepoint_get_pattern(
662 rule, &name);
663
664 assert(domain == LTTNG_DOMAIN_KERNEL);
665 assert(status == LTTNG_EVENT_RULE_STATUS_OK);
666 kernel_event_notifier->event.instrumentation =
667 LTTNG_KERNEL_TRACEPOINT;
668
669 ret_code = LTTNG_OK;
670 break;
671 }
672 case LTTNG_EVENT_RULE_TYPE_SYSCALL:
673 {
674 const enum lttng_event_rule_status status =
675 lttng_event_rule_syscall_get_pattern(
676 rule, &name);
677
678 assert(status == LTTNG_EVENT_RULE_STATUS_OK);
679
680 kernel_event_notifier->event.instrumentation =
681 LTTNG_KERNEL_SYSCALL;
682 kernel_event_notifier->event.u.syscall.abi =
683 LTTNG_KERNEL_SYSCALL_ABI_ALL;
684 kernel_event_notifier->event.u.syscall.entryexit =
685 LTTNG_KERNEL_SYSCALL_ENTRY;
686 kernel_event_notifier->event.u.syscall.match =
687 LTTNG_KERNEL_SYSCALL_MATCH_NAME;
688 ret_code = LTTNG_OK;
689 break;
690 }
691 case LTTNG_EVENT_RULE_TYPE_KRETPROBE:
692 default:
693 abort();
694 break;
695 }
696
697 strncpy_ret = lttng_strncpy(kernel_event_notifier->event.name, name,
698 LTTNG_KERNEL_SYM_NAME_LEN);
699 if (strncpy_ret) {
700 ret_code = LTTNG_ERR_INVALID;
701 goto error;
702 }
703
704 error:
705 return ret_code;
706 }
707 /*
708 * Allocate and initialize a kernel metadata.
709 *
710 * Return pointer to structure or NULL.
711 */
712 struct ltt_kernel_metadata *trace_kernel_create_metadata(void)
713 {
714 int ret;
715 struct ltt_kernel_metadata *lkm;
716 struct lttng_channel *chan;
717
718 lkm = zmalloc(sizeof(struct ltt_kernel_metadata));
719 chan = zmalloc(sizeof(struct lttng_channel));
720 if (lkm == NULL || chan == NULL) {
721 PERROR("kernel metadata zmalloc");
722 goto error;
723 }
724
725 ret = lttng_strncpy(
726 chan->name, DEFAULT_METADATA_NAME, sizeof(chan->name));
727 if (ret) {
728 ERR("Failed to initialize metadata channel name to `%s`",
729 DEFAULT_METADATA_NAME);
730 goto error;
731 }
732
733 /* Set default attributes */
734 chan->attr.overwrite = DEFAULT_METADATA_OVERWRITE;
735 chan->attr.subbuf_size = default_get_metadata_subbuf_size();
736 chan->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
737 chan->attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER;
738 chan->attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER;;
739
740
741 /*
742 * The metadata channel of kernel sessions must use the "mmap"
743 * back-end since the consumer daemon accumulates complete
744 * metadata units before sending them to the relay daemon in
745 * live mode. The consumer daemon also needs to extract the contents
746 * of the metadata cache when computing a rotation position.
747 *
748 * In both cases, it is not possible to rely on the splice
749 * back-end as the consumer daemon may need to accumulate more
750 * content than can be backed by the ring buffer's underlying
751 * pages.
752 */
753 chan->attr.output = LTTNG_EVENT_MMAP;
754 chan->attr.tracefile_size = 0;
755 chan->attr.tracefile_count = 0;
756 chan->attr.live_timer_interval = 0;
757
758 /* Init metadata */
759 lkm->fd = -1;
760 lkm->conf = chan;
761
762 return lkm;
763
764 error:
765 free(lkm);
766 free(chan);
767 return NULL;
768 }
769
770 /*
771 * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by
772 * default.
773 *
774 * Return pointer to structure or NULL.
775 */
776 struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
777 unsigned int count)
778 {
779 int ret;
780 struct ltt_kernel_stream *lks;
781
782 assert(name);
783
784 lks = zmalloc(sizeof(struct ltt_kernel_stream));
785 if (lks == NULL) {
786 PERROR("kernel stream zmalloc");
787 goto error;
788 }
789
790 /* Set name */
791 ret = snprintf(lks->name, sizeof(lks->name), "%s_%u", name, count);
792 if (ret < 0) {
793 PERROR("snprintf stream name");
794 goto error;
795 }
796 lks->name[sizeof(lks->name) - 1] = '\0';
797
798 /* Init stream */
799 lks->fd = -1;
800 lks->state = 0;
801 lks->cpu = count;
802
803 return lks;
804
805 error:
806 return NULL;
807 }
808
809 /*
810 * Cleanup kernel stream structure.
811 */
812 void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream)
813 {
814 assert(stream);
815
816 DBG("[trace] Closing stream fd %d", stream->fd);
817 /* Close kernel fd */
818 if (stream->fd >= 0) {
819 int ret;
820
821 ret = close(stream->fd);
822 if (ret) {
823 PERROR("close");
824 }
825 }
826 /* Remove from stream list */
827 cds_list_del(&stream->list);
828
829 free(stream);
830 }
831
832 /*
833 * Cleanup kernel event structure.
834 */
835 void trace_kernel_destroy_event(struct ltt_kernel_event *event)
836 {
837 assert(event);
838
839 if (event->fd >= 0) {
840 int ret;
841
842 DBG("[trace] Closing event fd %d", event->fd);
843 /* Close kernel fd */
844 ret = close(event->fd);
845 if (ret) {
846 PERROR("close");
847 }
848 } else {
849 DBG("[trace] Tearing down event (no associated file descriptor)");
850 }
851
852 /* Remove from event list */
853 cds_list_del(&event->list);
854
855 free(event->filter_expression);
856 free(event->filter);
857
858 free(event->event);
859 free(event);
860 }
861
862 /*
863 * Cleanup kernel event structure.
864 */
865 static void free_token_event_rule_rcu(struct rcu_head *rcu_node)
866 {
867 struct ltt_kernel_event_notifier_rule *rule = caa_container_of(rcu_node,
868 struct ltt_kernel_event_notifier_rule, rcu_node);
869
870 free(rule);
871 }
872
873 void trace_kernel_destroy_event_notifier_rule(
874 struct ltt_kernel_event_notifier_rule *event)
875 {
876 assert(event);
877
878 if (event->fd >= 0) {
879 const int ret = close(event->fd);
880
881 DBG("Closing kernel event notifier rule file descriptor: fd = %d",
882 event->fd);
883 if (ret) {
884 PERROR("Failed to close kernel event notifier file descriptor: fd = %d",
885 event->fd);
886 }
887 } else {
888 DBG("Destroying kernel event notifier rule (no associated file descriptor)");
889 }
890
891 lttng_trigger_put(event->trigger);
892 call_rcu(&event->rcu_node, free_token_event_rule_rcu);
893 }
894 /*
895 * Cleanup kernel context structure.
896 */
897 void trace_kernel_destroy_context(struct ltt_kernel_context *ctx)
898 {
899 assert(ctx);
900
901 if (ctx->in_list) {
902 cds_list_del(&ctx->list);
903 }
904 free(ctx);
905 }
906
907 /*
908 * Cleanup kernel channel structure.
909 */
910 void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel)
911 {
912 struct ltt_kernel_stream *stream, *stmp;
913 struct ltt_kernel_event *event, *etmp;
914 struct ltt_kernel_context *ctx, *ctmp;
915 int ret;
916 enum lttng_error_code status;
917
918 assert(channel);
919
920 DBG("[trace] Closing channel fd %d", channel->fd);
921 /* Close kernel fd */
922 if (channel->fd >= 0) {
923 ret = close(channel->fd);
924 if (ret) {
925 PERROR("close");
926 }
927 }
928
929 /* For each stream in the channel list */
930 cds_list_for_each_entry_safe(stream, stmp, &channel->stream_list.head, list) {
931 trace_kernel_destroy_stream(stream);
932 }
933
934 /* For each event in the channel list */
935 cds_list_for_each_entry_safe(event, etmp, &channel->events_list.head, list) {
936 trace_kernel_destroy_event(event);
937 }
938
939 /* For each context in the channel list */
940 cds_list_for_each_entry_safe(ctx, ctmp, &channel->ctx_list, list) {
941 trace_kernel_destroy_context(ctx);
942 }
943
944 /* Remove from channel list */
945 cds_list_del(&channel->list);
946
947 if (notification_thread_handle
948 && channel->published_to_notification_thread) {
949 status = notification_thread_command_remove_channel(
950 notification_thread_handle,
951 channel->key, LTTNG_DOMAIN_KERNEL);
952 assert(status == LTTNG_OK);
953 }
954 free(channel->channel->attr.extended.ptr);
955 free(channel->channel);
956 free(channel);
957 }
958
959 /*
960 * Cleanup kernel metadata structure.
961 */
962 void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata)
963 {
964 assert(metadata);
965
966 DBG("[trace] Closing metadata fd %d", metadata->fd);
967 /* Close kernel fd */
968 if (metadata->fd >= 0) {
969 int ret;
970
971 ret = close(metadata->fd);
972 if (ret) {
973 PERROR("close");
974 }
975 }
976
977 free(metadata->conf);
978 free(metadata);
979 }
980
981 /*
982 * Cleanup kernel session structure
983 *
984 * Should *NOT* be called with RCU read-side lock held.
985 */
986 void trace_kernel_destroy_session(struct ltt_kernel_session *session)
987 {
988 struct ltt_kernel_channel *channel, *ctmp;
989 int ret;
990
991 assert(session);
992
993 DBG("[trace] Closing session fd %d", session->fd);
994 /* Close kernel fds */
995 if (session->fd >= 0) {
996 ret = close(session->fd);
997 if (ret) {
998 PERROR("close");
999 }
1000 }
1001
1002 if (session->metadata_stream_fd >= 0) {
1003 DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd);
1004 ret = close(session->metadata_stream_fd);
1005 if (ret) {
1006 PERROR("close");
1007 }
1008 }
1009
1010 if (session->metadata != NULL) {
1011 trace_kernel_destroy_metadata(session->metadata);
1012 }
1013
1014 cds_list_for_each_entry_safe(channel, ctmp, &session->channel_list.head, list) {
1015 trace_kernel_destroy_channel(channel);
1016 }
1017 }
1018
1019 /* Free elements needed by destroy notifiers. */
1020 void trace_kernel_free_session(struct ltt_kernel_session *session)
1021 {
1022 /* Wipe consumer output object */
1023 consumer_output_put(session->consumer);
1024
1025 process_attr_tracker_destroy(session->tracker_pid);
1026 process_attr_tracker_destroy(session->tracker_vpid);
1027 process_attr_tracker_destroy(session->tracker_uid);
1028 process_attr_tracker_destroy(session->tracker_vuid);
1029 process_attr_tracker_destroy(session->tracker_gid);
1030 process_attr_tracker_destroy(session->tracker_vgid);
1031
1032 free(session);
1033 }
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