sessiond: Implement UST event notifier error counter
[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 uint64_t error_counter_index,
489 struct ltt_kernel_event_notifier_rule **event_notifier_rule)
490 {
491 enum lttng_error_code ret = LTTNG_OK;
492 enum lttng_condition_type condition_type;
493 enum lttng_event_rule_type event_rule_type;
494 enum lttng_condition_status condition_status;
495 struct ltt_kernel_event_notifier_rule *local_kernel_token_event_rule;
496 const struct lttng_condition *condition = NULL;
497 const struct lttng_event_rule *event_rule = NULL;
498
499 assert(event_notifier_rule);
500
501 condition = lttng_trigger_get_const_condition(trigger);
502 assert(condition);
503
504 condition_type = lttng_condition_get_type(condition);
505 assert(condition_type == LTTNG_CONDITION_TYPE_ON_EVENT);
506
507 condition_status = lttng_condition_on_event_get_rule(
508 condition, &event_rule);
509 assert(condition_status == LTTNG_CONDITION_STATUS_OK);
510 assert(event_rule);
511
512 event_rule_type = lttng_event_rule_get_type(event_rule);
513 assert(event_rule_type != LTTNG_EVENT_RULE_TYPE_UNKNOWN);
514
515 local_kernel_token_event_rule =
516 zmalloc(sizeof(struct ltt_kernel_event_notifier_rule));
517 if (local_kernel_token_event_rule == NULL) {
518 PERROR("Failed to allocate ltt_kernel_token_event_rule structure");
519 ret = LTTNG_ERR_NOMEM;
520 goto error;
521 }
522
523 local_kernel_token_event_rule->fd = -1;
524 local_kernel_token_event_rule->enabled = 1;
525 local_kernel_token_event_rule->token = token;
526 local_kernel_token_event_rule->error_counter_index = error_counter_index;
527
528 /* Get the reference of the event rule. */
529 lttng_trigger_get(trigger);
530
531 local_kernel_token_event_rule->trigger = trigger;
532 /* The event rule still owns the filter and bytecode. */
533 local_kernel_token_event_rule->filter =
534 lttng_event_rule_get_filter_bytecode(event_rule);
535
536 DBG3("Created kernel event notifier rule: token = %" PRIu64,
537 local_kernel_token_event_rule->token);
538 error:
539 *event_notifier_rule = local_kernel_token_event_rule;
540 return ret;
541 }
542
543 /*
544 * Initialize a kernel trigger from an event rule.
545 */
546 enum lttng_error_code trace_kernel_init_event_notifier_from_event_rule(
547 const struct lttng_event_rule *rule,
548 struct lttng_kernel_event_notifier *kernel_event_notifier)
549 {
550 enum lttng_error_code ret_code;
551 const char *name;
552 int strncpy_ret;
553
554 switch (lttng_event_rule_get_type(rule)) {
555 case LTTNG_EVENT_RULE_TYPE_KERNEL_PROBE:
556 {
557 uint64_t address = 0, offset = 0;
558 const char *symbol_name = NULL;
559 const struct lttng_kernel_probe_location *location = NULL;
560 enum lttng_kernel_probe_location_status k_status;
561 enum lttng_event_rule_status status;
562
563 status = lttng_event_rule_kernel_probe_get_location(rule, &location);
564 if (status != LTTNG_EVENT_RULE_STATUS_OK) {
565 ret_code = LTTNG_ERR_PROBE_LOCATION_INVAL;
566 goto error;
567 }
568
569 switch (lttng_kernel_probe_location_get_type(location)) {
570 case LTTNG_KERNEL_PROBE_LOCATION_TYPE_ADDRESS:
571 {
572 k_status = lttng_kernel_probe_location_address_get_address(
573 location, &address);
574 assert(k_status == LTTNG_KERNEL_PROBE_LOCATION_STATUS_OK);
575 break;
576 }
577 case LTTNG_KERNEL_PROBE_LOCATION_TYPE_SYMBOL_OFFSET:
578 {
579 k_status = lttng_kernel_probe_location_symbol_get_offset(
580 location, &offset);
581 assert(k_status == LTTNG_KERNEL_PROBE_LOCATION_STATUS_OK);
582 symbol_name = lttng_kernel_probe_location_symbol_get_name(
583 location);
584 break;
585 }
586 default:
587 abort();
588 }
589
590 kernel_event_notifier->event.instrumentation = LTTNG_KERNEL_KPROBE;
591 kernel_event_notifier->event.u.kprobe.addr = address;
592 kernel_event_notifier->event.u.kprobe.offset = offset;
593 if (symbol_name) {
594 strncpy_ret = lttng_strncpy(
595 kernel_event_notifier->event.u.kprobe.symbol_name,
596 symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
597
598 if (strncpy_ret) {
599 ret_code = LTTNG_ERR_INVALID;
600 goto error;
601 }
602 }
603
604 kernel_event_notifier->event.u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
605
606 status = lttng_event_rule_kernel_probe_get_event_name(rule, &name);
607 assert(status == LTTNG_EVENT_RULE_STATUS_OK);
608 ret_code = LTTNG_OK;
609 break;
610 }
611 case LTTNG_EVENT_RULE_TYPE_USERSPACE_PROBE:
612 {
613 const struct lttng_userspace_probe_location* location = NULL;
614 const struct lttng_userspace_probe_location_lookup_method *lookup = NULL;
615 enum lttng_event_rule_status status;
616
617 status = lttng_event_rule_userspace_probe_get_location(rule, &location);
618 if (status != LTTNG_EVENT_RULE_STATUS_OK) {
619 ret_code = LTTNG_ERR_PROBE_LOCATION_INVAL;
620 goto error;
621 }
622
623 kernel_event_notifier->event.instrumentation = LTTNG_KERNEL_UPROBE;
624
625 lookup = lttng_userspace_probe_location_get_lookup_method(
626 location);
627 if (!lookup) {
628 ret_code = LTTNG_ERR_PROBE_LOCATION_INVAL;
629 goto error;
630 }
631
632 /*
633 * From the kernel tracer's perspective, all userspace probe
634 * event types are all the same: a file and an offset.
635 */
636 switch (lttng_userspace_probe_location_lookup_method_get_type(lookup)) {
637 case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF:
638 /* Get the file descriptor on the target binary. */
639 kernel_event_notifier->event.u.uprobe.fd =
640 lttng_userspace_probe_location_function_get_binary_fd(location);
641
642 break;
643 case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT:
644 /* Get the file descriptor on the target binary. */
645 kernel_event_notifier->event.u.uprobe.fd =
646 lttng_userspace_probe_location_tracepoint_get_binary_fd(location);
647 break;
648 default:
649 abort();
650 }
651
652 status = lttng_event_rule_userspace_probe_get_event_name(
653 rule, &name);
654 assert(status == LTTNG_EVENT_RULE_STATUS_OK);
655 ret_code = LTTNG_OK;
656 break;
657 }
658 case LTTNG_EVENT_RULE_TYPE_TRACEPOINT:
659 {
660 const enum lttng_domain_type domain =
661 lttng_event_rule_get_domain_type(rule);
662 const enum lttng_event_rule_status status =
663 lttng_event_rule_tracepoint_get_pattern(
664 rule, &name);
665
666 assert(domain == LTTNG_DOMAIN_KERNEL);
667 assert(status == LTTNG_EVENT_RULE_STATUS_OK);
668 kernel_event_notifier->event.instrumentation =
669 LTTNG_KERNEL_TRACEPOINT;
670
671 ret_code = LTTNG_OK;
672 break;
673 }
674 case LTTNG_EVENT_RULE_TYPE_SYSCALL:
675 {
676 const enum lttng_event_rule_status status =
677 lttng_event_rule_syscall_get_pattern(
678 rule, &name);
679
680 assert(status == LTTNG_EVENT_RULE_STATUS_OK);
681
682 kernel_event_notifier->event.instrumentation =
683 LTTNG_KERNEL_SYSCALL;
684 kernel_event_notifier->event.u.syscall.abi =
685 LTTNG_KERNEL_SYSCALL_ABI_ALL;
686 kernel_event_notifier->event.u.syscall.entryexit =
687 LTTNG_KERNEL_SYSCALL_ENTRY;
688 kernel_event_notifier->event.u.syscall.match =
689 LTTNG_KERNEL_SYSCALL_MATCH_NAME;
690 ret_code = LTTNG_OK;
691 break;
692 }
693 case LTTNG_EVENT_RULE_TYPE_KERNEL_FUNCTION:
694 default:
695 abort();
696 break;
697 }
698
699 strncpy_ret = lttng_strncpy(kernel_event_notifier->event.name, name,
700 LTTNG_KERNEL_SYM_NAME_LEN);
701 if (strncpy_ret) {
702 ret_code = LTTNG_ERR_INVALID;
703 goto error;
704 }
705
706 error:
707 return ret_code;
708 }
709 /*
710 * Allocate and initialize a kernel metadata.
711 *
712 * Return pointer to structure or NULL.
713 */
714 struct ltt_kernel_metadata *trace_kernel_create_metadata(void)
715 {
716 int ret;
717 struct ltt_kernel_metadata *lkm;
718 struct lttng_channel *chan;
719
720 lkm = zmalloc(sizeof(struct ltt_kernel_metadata));
721 chan = zmalloc(sizeof(struct lttng_channel));
722 if (lkm == NULL || chan == NULL) {
723 PERROR("kernel metadata zmalloc");
724 goto error;
725 }
726
727 ret = lttng_strncpy(
728 chan->name, DEFAULT_METADATA_NAME, sizeof(chan->name));
729 if (ret) {
730 ERR("Failed to initialize metadata channel name to `%s`",
731 DEFAULT_METADATA_NAME);
732 goto error;
733 }
734
735 /* Set default attributes */
736 chan->attr.overwrite = DEFAULT_METADATA_OVERWRITE;
737 chan->attr.subbuf_size = default_get_metadata_subbuf_size();
738 chan->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
739 chan->attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER;
740 chan->attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER;;
741
742
743 /*
744 * The metadata channel of kernel sessions must use the "mmap"
745 * back-end since the consumer daemon accumulates complete
746 * metadata units before sending them to the relay daemon in
747 * live mode. The consumer daemon also needs to extract the contents
748 * of the metadata cache when computing a rotation position.
749 *
750 * In both cases, it is not possible to rely on the splice
751 * back-end as the consumer daemon may need to accumulate more
752 * content than can be backed by the ring buffer's underlying
753 * pages.
754 */
755 chan->attr.output = LTTNG_EVENT_MMAP;
756 chan->attr.tracefile_size = 0;
757 chan->attr.tracefile_count = 0;
758 chan->attr.live_timer_interval = 0;
759
760 /* Init metadata */
761 lkm->fd = -1;
762 lkm->conf = chan;
763
764 return lkm;
765
766 error:
767 free(lkm);
768 free(chan);
769 return NULL;
770 }
771
772 /*
773 * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by
774 * default.
775 *
776 * Return pointer to structure or NULL.
777 */
778 struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
779 unsigned int count)
780 {
781 int ret;
782 struct ltt_kernel_stream *lks;
783
784 assert(name);
785
786 lks = zmalloc(sizeof(struct ltt_kernel_stream));
787 if (lks == NULL) {
788 PERROR("kernel stream zmalloc");
789 goto error;
790 }
791
792 /* Set name */
793 ret = snprintf(lks->name, sizeof(lks->name), "%s_%u", name, count);
794 if (ret < 0) {
795 PERROR("snprintf stream name");
796 goto error;
797 }
798 lks->name[sizeof(lks->name) - 1] = '\0';
799
800 /* Init stream */
801 lks->fd = -1;
802 lks->state = 0;
803 lks->cpu = count;
804
805 return lks;
806
807 error:
808 return NULL;
809 }
810
811 /*
812 * Cleanup kernel stream structure.
813 */
814 void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream)
815 {
816 assert(stream);
817
818 DBG("[trace] Closing stream fd %d", stream->fd);
819 /* Close kernel fd */
820 if (stream->fd >= 0) {
821 int ret;
822
823 ret = close(stream->fd);
824 if (ret) {
825 PERROR("close");
826 }
827 }
828 /* Remove from stream list */
829 cds_list_del(&stream->list);
830
831 free(stream);
832 }
833
834 /*
835 * Cleanup kernel event structure.
836 */
837 void trace_kernel_destroy_event(struct ltt_kernel_event *event)
838 {
839 assert(event);
840
841 if (event->fd >= 0) {
842 int ret;
843
844 DBG("[trace] Closing event fd %d", event->fd);
845 /* Close kernel fd */
846 ret = close(event->fd);
847 if (ret) {
848 PERROR("close");
849 }
850 } else {
851 DBG("[trace] Tearing down event (no associated file descriptor)");
852 }
853
854 /* Remove from event list */
855 cds_list_del(&event->list);
856
857 free(event->filter_expression);
858 free(event->filter);
859
860 free(event->event);
861 free(event);
862 }
863
864 /*
865 * Cleanup kernel event structure.
866 */
867 static void free_token_event_rule_rcu(struct rcu_head *rcu_node)
868 {
869 struct ltt_kernel_event_notifier_rule *rule = caa_container_of(rcu_node,
870 struct ltt_kernel_event_notifier_rule, rcu_node);
871
872 free(rule);
873 }
874
875 void trace_kernel_destroy_event_notifier_rule(
876 struct ltt_kernel_event_notifier_rule *event)
877 {
878 assert(event);
879
880 if (event->fd >= 0) {
881 const int ret = close(event->fd);
882
883 DBG("Closing kernel event notifier rule file descriptor: fd = %d",
884 event->fd);
885 if (ret) {
886 PERROR("Failed to close kernel event notifier file descriptor: fd = %d",
887 event->fd);
888 }
889 } else {
890 DBG("Destroying kernel event notifier rule (no associated file descriptor)");
891 }
892
893 lttng_trigger_put(event->trigger);
894 call_rcu(&event->rcu_node, free_token_event_rule_rcu);
895 }
896 /*
897 * Cleanup kernel context structure.
898 */
899 void trace_kernel_destroy_context(struct ltt_kernel_context *ctx)
900 {
901 assert(ctx);
902
903 if (ctx->in_list) {
904 cds_list_del(&ctx->list);
905 }
906 free(ctx);
907 }
908
909 /*
910 * Cleanup kernel channel structure.
911 */
912 void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel)
913 {
914 struct ltt_kernel_stream *stream, *stmp;
915 struct ltt_kernel_event *event, *etmp;
916 struct ltt_kernel_context *ctx, *ctmp;
917 int ret;
918 enum lttng_error_code status;
919
920 assert(channel);
921
922 DBG("[trace] Closing channel fd %d", channel->fd);
923 /* Close kernel fd */
924 if (channel->fd >= 0) {
925 ret = close(channel->fd);
926 if (ret) {
927 PERROR("close");
928 }
929 }
930
931 /* For each stream in the channel list */
932 cds_list_for_each_entry_safe(stream, stmp, &channel->stream_list.head, list) {
933 trace_kernel_destroy_stream(stream);
934 }
935
936 /* For each event in the channel list */
937 cds_list_for_each_entry_safe(event, etmp, &channel->events_list.head, list) {
938 trace_kernel_destroy_event(event);
939 }
940
941 /* For each context in the channel list */
942 cds_list_for_each_entry_safe(ctx, ctmp, &channel->ctx_list, list) {
943 trace_kernel_destroy_context(ctx);
944 }
945
946 /* Remove from channel list */
947 cds_list_del(&channel->list);
948
949 if (notification_thread_handle
950 && channel->published_to_notification_thread) {
951 status = notification_thread_command_remove_channel(
952 notification_thread_handle,
953 channel->key, LTTNG_DOMAIN_KERNEL);
954 assert(status == LTTNG_OK);
955 }
956 free(channel->channel->attr.extended.ptr);
957 free(channel->channel);
958 free(channel);
959 }
960
961 /*
962 * Cleanup kernel metadata structure.
963 */
964 void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata)
965 {
966 assert(metadata);
967
968 DBG("[trace] Closing metadata fd %d", metadata->fd);
969 /* Close kernel fd */
970 if (metadata->fd >= 0) {
971 int ret;
972
973 ret = close(metadata->fd);
974 if (ret) {
975 PERROR("close");
976 }
977 }
978
979 free(metadata->conf);
980 free(metadata);
981 }
982
983 /*
984 * Cleanup kernel session structure
985 *
986 * Should *NOT* be called with RCU read-side lock held.
987 */
988 void trace_kernel_destroy_session(struct ltt_kernel_session *session)
989 {
990 struct ltt_kernel_channel *channel, *ctmp;
991 int ret;
992
993 assert(session);
994
995 DBG("[trace] Closing session fd %d", session->fd);
996 /* Close kernel fds */
997 if (session->fd >= 0) {
998 ret = close(session->fd);
999 if (ret) {
1000 PERROR("close");
1001 }
1002 }
1003
1004 if (session->metadata_stream_fd >= 0) {
1005 DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd);
1006 ret = close(session->metadata_stream_fd);
1007 if (ret) {
1008 PERROR("close");
1009 }
1010 }
1011
1012 if (session->metadata != NULL) {
1013 trace_kernel_destroy_metadata(session->metadata);
1014 }
1015
1016 cds_list_for_each_entry_safe(channel, ctmp, &session->channel_list.head, list) {
1017 trace_kernel_destroy_channel(channel);
1018 }
1019 }
1020
1021 /* Free elements needed by destroy notifiers. */
1022 void trace_kernel_free_session(struct ltt_kernel_session *session)
1023 {
1024 /* Wipe consumer output object */
1025 consumer_output_put(session->consumer);
1026
1027 process_attr_tracker_destroy(session->tracker_pid);
1028 process_attr_tracker_destroy(session->tracker_vpid);
1029 process_attr_tracker_destroy(session->tracker_uid);
1030 process_attr_tracker_destroy(session->tracker_vuid);
1031 process_attr_tracker_destroy(session->tracker_gid);
1032 process_attr_tracker_destroy(session->tracker_vgid);
1033
1034 free(session);
1035 }
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