Fix: keep active session state on redundant start command
[lttng-tools.git] / src / bin / lttng-sessiond / trace-kernel.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18 #define _LGPL_SOURCE
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <string.h>
22 #include <unistd.h>
23
24 #include <lttng/event.h>
25 #include <lttng/lttng-error.h>
26 #include <lttng/userspace-probe.h>
27 #include <lttng/userspace-probe-internal.h>
28
29 #include <common/common.h>
30 #include <common/defaults.h>
31 #include <common/trace-chunk.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_filter_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_list_pid = lttng_tracker_list_create();
168 if (!lks->tracker_list_pid) {
169 goto error;
170 }
171 lks->tracker_list_vpid = lttng_tracker_list_create();
172 if (!lks->tracker_list_vpid) {
173 goto error;
174 }
175 lks->tracker_list_uid = lttng_tracker_list_create();
176 if (!lks->tracker_list_uid) {
177 goto error;
178 }
179 lks->tracker_list_vuid = lttng_tracker_list_create();
180 if (!lks->tracker_list_vuid) {
181 goto error;
182 }
183 lks->tracker_list_gid = lttng_tracker_list_create();
184 if (!lks->tracker_list_gid) {
185 goto error;
186 }
187 lks->tracker_list_vgid = lttng_tracker_list_create();
188 if (!lks->tracker_list_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 lttng_tracker_list_destroy(lks->tracker_list_pid);
200 lttng_tracker_list_destroy(lks->tracker_list_vpid);
201 lttng_tracker_list_destroy(lks->tracker_list_uid);
202 lttng_tracker_list_destroy(lks->tracker_list_vuid);
203 lttng_tracker_list_destroy(lks->tracker_list_gid);
204 lttng_tracker_list_destroy(lks->tracker_list_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_filter_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 /*
382 * Only the elf lookup method is supported at the moment.
383 */
384 lookup = lttng_userspace_probe_location_get_lookup_method(
385 location);
386 if (!lookup) {
387 ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
388 goto error;
389 }
390
391 /*
392 * From the kernel tracer's perspective, all userspace probe
393 * event types are all the same: a file and an offset.
394 */
395 switch (lttng_userspace_probe_location_lookup_method_get_type(lookup)) {
396 case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF:
397 /* Get the file descriptor on the target binary. */
398 attr->u.uprobe.fd =
399 lttng_userspace_probe_location_function_get_binary_fd(location);
400
401 /*
402 * Save a reference to the probe location used during
403 * the listing of events. Close its FD since it won't
404 * be needed for listing.
405 */
406 userspace_probe_location =
407 lttng_userspace_probe_location_copy(location);
408 ret = lttng_userspace_probe_location_function_set_binary_fd(
409 userspace_probe_location, -1);
410 if (ret) {
411 goto error;
412 }
413 break;
414 case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT:
415 /* Get the file descriptor on the target binary. */
416 attr->u.uprobe.fd =
417 lttng_userspace_probe_location_tracepoint_get_binary_fd(location);
418
419 /*
420 * Save a reference to the probe location used during the listing of
421 * events. Close its FD since it won't be needed for listing.
422 */
423 userspace_probe_location =
424 lttng_userspace_probe_location_copy(location);
425 ret = lttng_userspace_probe_location_tracepoint_set_binary_fd(
426 userspace_probe_location, -1);
427 if (ret) {
428 goto error;
429 }
430 break;
431 default:
432 DBG("Unsupported lookup method type");
433 ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
434 goto error;
435 }
436 break;
437 }
438 case LTTNG_EVENT_FUNCTION:
439 attr->instrumentation = LTTNG_KERNEL_KRETPROBE;
440 attr->u.kretprobe.addr = ev->attr.probe.addr;
441 attr->u.kretprobe.offset = ev->attr.probe.offset;
442 strncpy(attr->u.kretprobe.symbol_name,
443 ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
444 attr->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
445 break;
446 case LTTNG_EVENT_FUNCTION_ENTRY:
447 attr->instrumentation = LTTNG_KERNEL_FUNCTION;
448 strncpy(attr->u.ftrace.symbol_name,
449 ev->attr.ftrace.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
450 attr->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
451 break;
452 case LTTNG_EVENT_TRACEPOINT:
453 attr->instrumentation = LTTNG_KERNEL_TRACEPOINT;
454 break;
455 case LTTNG_EVENT_SYSCALL:
456 attr->instrumentation = LTTNG_KERNEL_SYSCALL;
457 break;
458 case LTTNG_EVENT_ALL:
459 attr->instrumentation = LTTNG_KERNEL_ALL;
460 break;
461 default:
462 ERR("Unknown kernel instrumentation type (%d)", ev->type);
463 ret = LTTNG_ERR_INVALID;
464 goto error;
465 }
466
467 /* Copy event name */
468 strncpy(attr->name, ev->name, LTTNG_KERNEL_SYM_NAME_LEN);
469 attr->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
470
471 /* Setting up a kernel event */
472 local_kernel_event->fd = -1;
473 local_kernel_event->event = attr;
474 local_kernel_event->enabled = 1;
475 local_kernel_event->filter_expression = filter_expression;
476 local_kernel_event->filter = filter;
477 local_kernel_event->userspace_probe_location = userspace_probe_location;
478
479 *kernel_event = local_kernel_event;
480
481 return LTTNG_OK;
482
483 error:
484 free(filter_expression);
485 free(filter);
486 free(local_kernel_event);
487 free(attr);
488 return ret;
489 }
490
491 /*
492 * Allocate and initialize a kernel metadata.
493 *
494 * Return pointer to structure or NULL.
495 */
496 struct ltt_kernel_metadata *trace_kernel_create_metadata(void)
497 {
498 struct ltt_kernel_metadata *lkm;
499 struct lttng_channel *chan;
500
501 lkm = zmalloc(sizeof(struct ltt_kernel_metadata));
502 chan = zmalloc(sizeof(struct lttng_channel));
503 if (lkm == NULL || chan == NULL) {
504 PERROR("kernel metadata zmalloc");
505 goto error;
506 }
507
508 /* Set default attributes */
509 chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
510 chan->attr.subbuf_size = default_get_metadata_subbuf_size();
511 chan->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
512 chan->attr.switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER;
513 chan->attr.read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER;
514 chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
515
516 /* Init metadata */
517 lkm->fd = -1;
518 lkm->conf = chan;
519
520 return lkm;
521
522 error:
523 free(lkm);
524 free(chan);
525 return NULL;
526 }
527
528 /*
529 * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by
530 * default.
531 *
532 * Return pointer to structure or NULL.
533 */
534 struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
535 unsigned int count)
536 {
537 int ret;
538 struct ltt_kernel_stream *lks;
539
540 assert(name);
541
542 lks = zmalloc(sizeof(struct ltt_kernel_stream));
543 if (lks == NULL) {
544 PERROR("kernel stream zmalloc");
545 goto error;
546 }
547
548 /* Set name */
549 ret = snprintf(lks->name, sizeof(lks->name), "%s_%u", name, count);
550 if (ret < 0) {
551 PERROR("snprintf stream name");
552 goto error;
553 }
554 lks->name[sizeof(lks->name) - 1] = '\0';
555
556 /* Init stream */
557 lks->fd = -1;
558 lks->state = 0;
559 lks->cpu = count;
560
561 return lks;
562
563 error:
564 return NULL;
565 }
566
567 /*
568 * Cleanup kernel stream structure.
569 */
570 void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream)
571 {
572 assert(stream);
573
574 DBG("[trace] Closing stream fd %d", stream->fd);
575 /* Close kernel fd */
576 if (stream->fd >= 0) {
577 int ret;
578
579 ret = close(stream->fd);
580 if (ret) {
581 PERROR("close");
582 }
583 }
584 /* Remove from stream list */
585 cds_list_del(&stream->list);
586
587 free(stream);
588 }
589
590 /*
591 * Cleanup kernel event structure.
592 */
593 void trace_kernel_destroy_event(struct ltt_kernel_event *event)
594 {
595 assert(event);
596
597 if (event->fd >= 0) {
598 int ret;
599
600 DBG("[trace] Closing event fd %d", event->fd);
601 /* Close kernel fd */
602 ret = close(event->fd);
603 if (ret) {
604 PERROR("close");
605 }
606 } else {
607 DBG("[trace] Tearing down event (no associated fd)");
608 }
609
610 /* Remove from event list */
611 cds_list_del(&event->list);
612
613 free(event->filter_expression);
614 free(event->filter);
615
616 free(event->event);
617 free(event);
618 }
619
620 /*
621 * Cleanup kernel context structure.
622 */
623 void trace_kernel_destroy_context(struct ltt_kernel_context *ctx)
624 {
625 assert(ctx);
626
627 if (ctx->in_list) {
628 cds_list_del(&ctx->list);
629 }
630 free(ctx);
631 }
632
633 /*
634 * Cleanup kernel channel structure.
635 */
636 void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel)
637 {
638 struct ltt_kernel_stream *stream, *stmp;
639 struct ltt_kernel_event *event, *etmp;
640 struct ltt_kernel_context *ctx, *ctmp;
641 int ret;
642 enum lttng_error_code status;
643
644 assert(channel);
645
646 DBG("[trace] Closing channel fd %d", channel->fd);
647 /* Close kernel fd */
648 if (channel->fd >= 0) {
649 ret = close(channel->fd);
650 if (ret) {
651 PERROR("close");
652 }
653 }
654
655 /* For each stream in the channel list */
656 cds_list_for_each_entry_safe(stream, stmp, &channel->stream_list.head, list) {
657 trace_kernel_destroy_stream(stream);
658 }
659
660 /* For each event in the channel list */
661 cds_list_for_each_entry_safe(event, etmp, &channel->events_list.head, list) {
662 trace_kernel_destroy_event(event);
663 }
664
665 /* For each context in the channel list */
666 cds_list_for_each_entry_safe(ctx, ctmp, &channel->ctx_list, list) {
667 trace_kernel_destroy_context(ctx);
668 }
669
670 /* Remove from channel list */
671 cds_list_del(&channel->list);
672
673 if (notification_thread_handle
674 && channel->published_to_notification_thread) {
675 status = notification_thread_command_remove_channel(
676 notification_thread_handle,
677 channel->key, LTTNG_DOMAIN_KERNEL);
678 assert(status == LTTNG_OK);
679 }
680 free(channel->channel->attr.extended.ptr);
681 free(channel->channel);
682 free(channel);
683 }
684
685 /*
686 * Cleanup kernel metadata structure.
687 */
688 void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata)
689 {
690 assert(metadata);
691
692 DBG("[trace] Closing metadata fd %d", metadata->fd);
693 /* Close kernel fd */
694 if (metadata->fd >= 0) {
695 int ret;
696
697 ret = close(metadata->fd);
698 if (ret) {
699 PERROR("close");
700 }
701 }
702
703 free(metadata->conf);
704 free(metadata);
705 }
706
707 /*
708 * Cleanup kernel session structure
709 *
710 * Should *NOT* be called with RCU read-side lock held.
711 */
712 void trace_kernel_destroy_session(struct ltt_kernel_session *session)
713 {
714 struct ltt_kernel_channel *channel, *ctmp;
715 int ret;
716
717 assert(session);
718
719 DBG("[trace] Closing session fd %d", session->fd);
720 /* Close kernel fds */
721 if (session->fd >= 0) {
722 ret = close(session->fd);
723 if (ret) {
724 PERROR("close");
725 }
726 }
727
728 if (session->metadata_stream_fd >= 0) {
729 DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd);
730 ret = close(session->metadata_stream_fd);
731 if (ret) {
732 PERROR("close");
733 }
734 }
735
736 if (session->metadata != NULL) {
737 trace_kernel_destroy_metadata(session->metadata);
738 }
739
740 cds_list_for_each_entry_safe(channel, ctmp, &session->channel_list.head, list) {
741 trace_kernel_destroy_channel(channel);
742 }
743 }
744
745 /* Free elements needed by destroy notifiers. */
746 void trace_kernel_free_session(struct ltt_kernel_session *session)
747 {
748 /* Wipe consumer output object */
749 consumer_output_put(session->consumer);
750
751 lttng_tracker_list_destroy(session->tracker_list_pid);
752 lttng_tracker_list_destroy(session->tracker_list_vpid);
753 lttng_tracker_list_destroy(session->tracker_list_uid);
754 lttng_tracker_list_destroy(session->tracker_list_vuid);
755 lttng_tracker_list_destroy(session->tracker_list_gid);
756 lttng_tracker_list_destroy(session->tracker_list_vgid);
757
758 free(session);
759 }
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