1c325fb259b24ca497618dbe1ba309052be8266b
[lttng-tools.git] / src / bin / lttng-sessiond / trace-ust.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
17 */
18
19 #define _LGPL_SOURCE
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <unistd.h>
24 #include <inttypes.h>
25
26 #include <common/common.h>
27 #include <common/defaults.h>
28
29 #include "buffer-registry.h"
30 #include "trace-ust.h"
31 #include "utils.h"
32 #include "ust-app.h"
33 #include "agent.h"
34
35 /*
36 * Match function for the events hash table lookup.
37 *
38 * Matches by name only. Used by the disable command.
39 */
40 int trace_ust_ht_match_event_by_name(struct cds_lfht_node *node,
41 const void *_key)
42 {
43 struct ltt_ust_event *event;
44 const char *name;
45
46 assert(node);
47 assert(_key);
48
49 event = caa_container_of(node, struct ltt_ust_event, node.node);
50 name = _key;
51
52 /* Event name */
53 if (strncmp(event->attr.name, name, sizeof(event->attr.name)) != 0) {
54 goto no_match;
55 }
56
57 /* Match */
58 return 1;
59
60 no_match:
61 return 0;
62 }
63
64 /*
65 * Match function for the hash table lookup.
66 *
67 * It matches an ust event based on three attributes which are the event name,
68 * the filter bytecode and the loglevel.
69 */
70 int trace_ust_ht_match_event(struct cds_lfht_node *node, const void *_key)
71 {
72 struct ltt_ust_event *event;
73 const struct ltt_ust_ht_key *key;
74 int ev_loglevel_value;
75 int ll_match;
76
77 assert(node);
78 assert(_key);
79
80 event = caa_container_of(node, struct ltt_ust_event, node.node);
81 key = _key;
82 ev_loglevel_value = event->attr.loglevel;
83
84 /* Match the 4 elements of the key: name, filter, loglevel, exclusions. */
85
86 /* Event name */
87 if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) {
88 goto no_match;
89 }
90
91 /* Event loglevel value and type. */
92 ll_match = loglevels_match(event->attr.loglevel_type,
93 ev_loglevel_value, key->loglevel_type,
94 key->loglevel_value, LTTNG_UST_LOGLEVEL_ALL);
95
96 if (!ll_match) {
97 goto no_match;
98 }
99
100 /* Only one of the filters is NULL, fail. */
101 if ((key->filter && !event->filter) || (!key->filter && event->filter)) {
102 goto no_match;
103 }
104
105 if (key->filter && event->filter) {
106 /* Both filters exists, check length followed by the bytecode. */
107 if (event->filter->len != key->filter->len ||
108 memcmp(event->filter->data, key->filter->data,
109 event->filter->len) != 0) {
110 goto no_match;
111 }
112 }
113
114 /* If only one of the exclusions is NULL, fail. */
115 if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) {
116 goto no_match;
117 }
118
119 if (key->exclusion && event->exclusion) {
120 size_t i;
121
122 /* Check exclusion counts first. */
123 if (event->exclusion->count != key->exclusion->count) {
124 goto no_match;
125 }
126
127 /* Compare names individually. */
128 for (i = 0; i < event->exclusion->count; ++i) {
129 size_t j;
130 bool found = false;
131 const char *name_ev =
132 LTTNG_EVENT_EXCLUSION_NAME_AT(
133 event->exclusion, i);
134
135 /*
136 * Compare this exclusion name to all the key's
137 * exclusion names.
138 */
139 for (j = 0; j < key->exclusion->count; ++j) {
140 const char *name_key =
141 LTTNG_EVENT_EXCLUSION_NAME_AT(
142 key->exclusion, j);
143
144 if (!strncmp(name_ev, name_key,
145 LTTNG_SYMBOL_NAME_LEN)) {
146 /* Names match! */
147 found = true;
148 break;
149 }
150 }
151
152 /*
153 * If the current exclusion name was not found amongst
154 * the key's exclusion names, then there's no match.
155 */
156 if (!found) {
157 goto no_match;
158 }
159 }
160 }
161 /* Match. */
162 return 1;
163
164 no_match:
165 return 0;
166 }
167
168 /*
169 * Find the channel in the hashtable and return channel pointer. RCU read side
170 * lock MUST be acquired before calling this.
171 */
172 struct ltt_ust_channel *trace_ust_find_channel_by_name(struct lttng_ht *ht,
173 char *name)
174 {
175 struct lttng_ht_node_str *node;
176 struct lttng_ht_iter iter;
177
178 /*
179 * If we receive an empty string for channel name, it means the
180 * default channel name is requested.
181 */
182 if (name[0] == '\0')
183 name = DEFAULT_CHANNEL_NAME;
184
185 lttng_ht_lookup(ht, (void *)name, &iter);
186 node = lttng_ht_iter_get_node_str(&iter);
187 if (node == NULL) {
188 goto error;
189 }
190
191 DBG2("Trace UST channel %s found by name", name);
192
193 return caa_container_of(node, struct ltt_ust_channel, node);
194
195 error:
196 DBG2("Trace UST channel %s not found by name", name);
197 return NULL;
198 }
199
200 /*
201 * Find the event in the hashtable and return event pointer. RCU read side lock
202 * MUST be acquired before calling this.
203 */
204 struct ltt_ust_event *trace_ust_find_event(struct lttng_ht *ht,
205 char *name, struct lttng_filter_bytecode *filter,
206 enum lttng_ust_loglevel_type loglevel_type, int loglevel_value,
207 struct lttng_event_exclusion *exclusion)
208 {
209 struct lttng_ht_node_str *node;
210 struct lttng_ht_iter iter;
211 struct ltt_ust_ht_key key;
212
213 assert(name);
214 assert(ht);
215
216 key.name = name;
217 key.filter = filter;
218 key.loglevel_type = loglevel_type;
219 key.loglevel_value = loglevel_value;
220 key.exclusion = exclusion;
221
222 cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
223 trace_ust_ht_match_event, &key, &iter.iter);
224 node = lttng_ht_iter_get_node_str(&iter);
225 if (node == NULL) {
226 goto error;
227 }
228
229 DBG2("Trace UST event %s found", key.name);
230
231 return caa_container_of(node, struct ltt_ust_event, node);
232
233 error:
234 DBG2("Trace UST event %s NOT found", key.name);
235 return NULL;
236 }
237
238 /*
239 * Lookup an agent in the session agents hash table by domain type and return
240 * the object if found else NULL.
241 *
242 * RCU read side lock must be acquired before calling and only released
243 * once the agent is no longer in scope or being used.
244 */
245 struct agent *trace_ust_find_agent(struct ltt_ust_session *session,
246 enum lttng_domain_type domain_type)
247 {
248 struct agent *agt = NULL;
249 struct lttng_ht_node_u64 *node;
250 struct lttng_ht_iter iter;
251 uint64_t key;
252
253 assert(session);
254
255 DBG3("Trace ust agent lookup for domain %d", domain_type);
256
257 key = domain_type;
258
259 lttng_ht_lookup(session->agents, &key, &iter);
260 node = lttng_ht_iter_get_node_u64(&iter);
261 if (!node) {
262 goto end;
263 }
264 agt = caa_container_of(node, struct agent, node);
265
266 end:
267 return agt;
268 }
269
270 /*
271 * Allocate and initialize a ust session data structure.
272 *
273 * Return pointer to structure or NULL.
274 */
275 struct ltt_ust_session *trace_ust_create_session(uint64_t session_id)
276 {
277 struct ltt_ust_session *lus;
278
279 /* Allocate a new ltt ust session */
280 lus = zmalloc(sizeof(struct ltt_ust_session));
281 if (lus == NULL) {
282 PERROR("create ust session zmalloc");
283 goto error;
284 }
285
286 /* Init data structure */
287 lus->id = session_id;
288 lus->active = 0;
289
290 /* Set default metadata channel attribute. */
291 lus->metadata_attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
292 lus->metadata_attr.subbuf_size = default_get_metadata_subbuf_size();
293 lus->metadata_attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
294 lus->metadata_attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER;
295 lus->metadata_attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER;
296 lus->metadata_attr.output = LTTNG_UST_MMAP;
297
298 /*
299 * Default buffer type. This can be changed through an enable channel
300 * requesting a different type. Note that this can only be changed once
301 * during the session lifetime which is at the first enable channel and
302 * only before start. The flag buffer_type_changed indicates the status.
303 */
304 lus->buffer_type = LTTNG_BUFFER_PER_UID;
305 /* Once set to 1, the buffer_type is immutable for the session. */
306 lus->buffer_type_changed = 0;
307 /* Init it in case it get used after allocation. */
308 CDS_INIT_LIST_HEAD(&lus->buffer_reg_uid_list);
309
310 /* Alloc UST global domain channels' HT */
311 lus->domain_global.channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
312 /* Alloc agent hash table. */
313 lus->agents = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
314
315 lus->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
316 if (lus->consumer == NULL) {
317 goto error_consumer;
318 }
319
320 DBG2("UST trace session create successful");
321
322 return lus;
323
324 error_consumer:
325 ht_cleanup_push(lus->domain_global.channels);
326 ht_cleanup_push(lus->agents);
327 free(lus);
328 error:
329 return NULL;
330 }
331
332 /*
333 * Allocate and initialize a ust channel data structure.
334 *
335 * Return pointer to structure or NULL.
336 */
337 struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *chan,
338 enum lttng_domain_type domain)
339 {
340 struct ltt_ust_channel *luc;
341
342 assert(chan);
343
344 luc = zmalloc(sizeof(struct ltt_ust_channel));
345 if (luc == NULL) {
346 PERROR("ltt_ust_channel zmalloc");
347 goto error;
348 }
349
350 luc->domain = domain;
351
352 /* Copy UST channel attributes */
353 luc->attr.overwrite = chan->attr.overwrite;
354 luc->attr.subbuf_size = chan->attr.subbuf_size;
355 luc->attr.num_subbuf = chan->attr.num_subbuf;
356 luc->attr.switch_timer_interval = chan->attr.switch_timer_interval;
357 luc->attr.read_timer_interval = chan->attr.read_timer_interval;
358 luc->attr.output = (enum lttng_ust_output) chan->attr.output;
359
360 /* Translate to UST output enum */
361 switch (luc->attr.output) {
362 default:
363 luc->attr.output = LTTNG_UST_MMAP;
364 break;
365 }
366
367 /*
368 * If we receive an empty string for channel name, it means the
369 * default channel name is requested.
370 */
371 if (chan->name[0] == '\0') {
372 strncpy(luc->name, DEFAULT_CHANNEL_NAME, sizeof(luc->name));
373 } else {
374 /* Copy channel name */
375 strncpy(luc->name, chan->name, sizeof(luc->name));
376 }
377 luc->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
378
379 /* Init node */
380 lttng_ht_node_init_str(&luc->node, luc->name);
381 CDS_INIT_LIST_HEAD(&luc->ctx_list);
382
383 /* Alloc hash tables */
384 luc->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
385 luc->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
386
387 /* On-disk circular buffer parameters */
388 luc->tracefile_size = chan->attr.tracefile_size;
389 luc->tracefile_count = chan->attr.tracefile_count;
390
391 DBG2("Trace UST channel %s created", luc->name);
392
393 error:
394 return luc;
395 }
396
397 /*
398 * Validates an exclusion list.
399 *
400 * Returns 0 if valid, negative value if invalid.
401 */
402 static int validate_exclusion(struct lttng_event_exclusion *exclusion)
403 {
404 size_t i;
405 int ret = 0;
406
407 assert(exclusion);
408
409 for (i = 0; i < exclusion->count; ++i) {
410 size_t j;
411 const char *name_a =
412 LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i);
413
414 for (j = 0; j < i; ++j) {
415 const char *name_b =
416 LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, j);
417
418 if (!strncmp(name_a, name_b, LTTNG_SYMBOL_NAME_LEN)) {
419 /* Match! */
420 ret = -1;
421 goto end;
422 }
423 }
424 }
425
426 end:
427 return ret;
428 }
429
430 /*
431 * Allocate and initialize a ust event. Set name and event type.
432 * We own filter_expression, filter, and exclusion.
433 *
434 * Return pointer to structure or NULL.
435 */
436 struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev,
437 char *filter_expression,
438 struct lttng_filter_bytecode *filter,
439 struct lttng_event_exclusion *exclusion,
440 bool internal_event)
441 {
442 struct ltt_ust_event *lue;
443
444 assert(ev);
445
446 if (exclusion && validate_exclusion(exclusion)) {
447 goto error;
448 }
449
450 lue = zmalloc(sizeof(struct ltt_ust_event));
451 if (lue == NULL) {
452 PERROR("ust event zmalloc");
453 goto error;
454 }
455
456 lue->internal = internal_event;
457
458 switch (ev->type) {
459 case LTTNG_EVENT_PROBE:
460 lue->attr.instrumentation = LTTNG_UST_PROBE;
461 break;
462 case LTTNG_EVENT_FUNCTION:
463 lue->attr.instrumentation = LTTNG_UST_FUNCTION;
464 break;
465 case LTTNG_EVENT_FUNCTION_ENTRY:
466 lue->attr.instrumentation = LTTNG_UST_FUNCTION;
467 break;
468 case LTTNG_EVENT_TRACEPOINT:
469 lue->attr.instrumentation = LTTNG_UST_TRACEPOINT;
470 break;
471 default:
472 ERR("Unknown ust instrumentation type (%d)", ev->type);
473 goto error_free_event;
474 }
475
476 /* Copy event name */
477 strncpy(lue->attr.name, ev->name, LTTNG_UST_SYM_NAME_LEN);
478 lue->attr.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
479
480 switch (ev->loglevel_type) {
481 case LTTNG_EVENT_LOGLEVEL_ALL:
482 lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_ALL;
483 lue->attr.loglevel = -1; /* Force to -1 */
484 break;
485 case LTTNG_EVENT_LOGLEVEL_RANGE:
486 lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_RANGE;
487 lue->attr.loglevel = ev->loglevel;
488 break;
489 case LTTNG_EVENT_LOGLEVEL_SINGLE:
490 lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_SINGLE;
491 lue->attr.loglevel = ev->loglevel;
492 break;
493 default:
494 ERR("Unknown ust loglevel type (%d)", ev->loglevel_type);
495 goto error_free_event;
496 }
497
498 /* Same layout. */
499 lue->filter_expression = filter_expression;
500 lue->filter = filter;
501 lue->exclusion = exclusion;
502
503 /* Init node */
504 lttng_ht_node_init_str(&lue->node, lue->attr.name);
505
506 DBG2("Trace UST event %s, loglevel (%d,%d) created",
507 lue->attr.name, lue->attr.loglevel_type,
508 lue->attr.loglevel);
509
510 return lue;
511
512 error_free_event:
513 free(lue);
514 error:
515 free(filter_expression);
516 free(filter);
517 free(exclusion);
518 return NULL;
519 }
520
521 static
522 int trace_ust_context_type_event_to_ust(
523 enum lttng_event_context_type type)
524 {
525 int utype;
526
527 switch (type) {
528 case LTTNG_EVENT_CONTEXT_VTID:
529 utype = LTTNG_UST_CONTEXT_VTID;
530 break;
531 case LTTNG_EVENT_CONTEXT_VPID:
532 utype = LTTNG_UST_CONTEXT_VPID;
533 break;
534 case LTTNG_EVENT_CONTEXT_PTHREAD_ID:
535 utype = LTTNG_UST_CONTEXT_PTHREAD_ID;
536 break;
537 case LTTNG_EVENT_CONTEXT_PROCNAME:
538 utype = LTTNG_UST_CONTEXT_PROCNAME;
539 break;
540 case LTTNG_EVENT_CONTEXT_IP:
541 utype = LTTNG_UST_CONTEXT_IP;
542 break;
543 case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER:
544 if (!ustctl_has_perf_counters()) {
545 utype = -1;
546 WARN("Perf counters not implemented in UST");
547 } else {
548 utype = LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER;
549 }
550 break;
551 case LTTNG_EVENT_CONTEXT_APP_CONTEXT:
552 utype = LTTNG_UST_CONTEXT_APP_CONTEXT;
553 break;
554 default:
555 utype = -1;
556 break;
557 }
558 return utype;
559 }
560
561 /*
562 * Return 1 if contexts match, 0 otherwise.
563 */
564 int trace_ust_match_context(struct ltt_ust_context *uctx,
565 struct lttng_event_context *ctx)
566 {
567 int utype;
568
569 utype = trace_ust_context_type_event_to_ust(ctx->ctx);
570 if (utype < 0) {
571 return 0;
572 }
573 if (uctx->ctx.ctx != utype) {
574 return 0;
575 }
576 switch (utype) {
577 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER:
578 if (uctx->ctx.u.perf_counter.type
579 != ctx->u.perf_counter.type) {
580 return 0;
581 }
582 if (uctx->ctx.u.perf_counter.config
583 != ctx->u.perf_counter.config) {
584 return 0;
585 }
586 if (strncmp(uctx->ctx.u.perf_counter.name,
587 ctx->u.perf_counter.name,
588 LTTNG_UST_SYM_NAME_LEN)) {
589 return 0;
590 }
591 break;
592 case LTTNG_UST_CONTEXT_APP_CONTEXT:
593 assert(uctx->ctx.u.app_ctx.provider_name);
594 assert(uctx->ctx.u.app_ctx.ctx_name);
595 if (strcmp(uctx->ctx.u.app_ctx.provider_name,
596 ctx->u.app_ctx.provider_name) ||
597 strcmp(uctx->ctx.u.app_ctx.ctx_name,
598 ctx->u.app_ctx.ctx_name)) {
599 return 0;
600 }
601 default:
602 break;
603
604 }
605 return 1;
606 }
607
608 /*
609 * Allocate and initialize an UST context.
610 *
611 * Return pointer to structure or NULL.
612 */
613 struct ltt_ust_context *trace_ust_create_context(
614 struct lttng_event_context *ctx)
615 {
616 struct ltt_ust_context *uctx = NULL;
617 int utype;
618
619 assert(ctx);
620
621 utype = trace_ust_context_type_event_to_ust(ctx->ctx);
622 if (utype < 0) {
623 ERR("Invalid UST context");
624 goto end;
625 }
626
627 uctx = zmalloc(sizeof(struct ltt_ust_context));
628 if (!uctx) {
629 PERROR("zmalloc ltt_ust_context");
630 goto end;
631 }
632
633 uctx->ctx.ctx = (enum lttng_ust_context_type) utype;
634 switch (utype) {
635 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER:
636 uctx->ctx.u.perf_counter.type = ctx->u.perf_counter.type;
637 uctx->ctx.u.perf_counter.config = ctx->u.perf_counter.config;
638 strncpy(uctx->ctx.u.perf_counter.name, ctx->u.perf_counter.name,
639 LTTNG_UST_SYM_NAME_LEN);
640 uctx->ctx.u.perf_counter.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
641 break;
642 case LTTNG_UST_CONTEXT_APP_CONTEXT:
643 {
644 char *provider_name = NULL, *ctx_name = NULL;
645
646 provider_name = strdup(ctx->u.app_ctx.provider_name);
647 if (!provider_name) {
648 goto error;
649 }
650 uctx->ctx.u.app_ctx.provider_name = provider_name;
651
652 ctx_name = strdup(ctx->u.app_ctx.ctx_name);
653 if (!ctx_name) {
654 goto error;
655 }
656 uctx->ctx.u.app_ctx.ctx_name = ctx_name;
657 break;
658 }
659 default:
660 break;
661 }
662 lttng_ht_node_init_ulong(&uctx->node, (unsigned long) uctx->ctx.ctx);
663 end:
664 return uctx;
665 error:
666 trace_ust_destroy_context(uctx);
667 return NULL;
668 }
669
670 static
671 void destroy_pid_tracker_node_rcu(struct rcu_head *head)
672 {
673 struct ust_pid_tracker_node *tracker_node =
674 caa_container_of(head, struct ust_pid_tracker_node, node.head);
675 free(tracker_node);
676 }
677
678 static
679 void destroy_pid_tracker_node(struct ust_pid_tracker_node *tracker_node)
680 {
681
682 call_rcu(&tracker_node->node.head, destroy_pid_tracker_node_rcu);
683 }
684
685 static
686 int init_pid_tracker(struct ust_pid_tracker *pid_tracker)
687 {
688 int ret = 0;
689
690 pid_tracker->ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
691 if (!pid_tracker->ht) {
692 ret = -1;
693 goto end;
694 }
695
696 end:
697 return ret;
698 }
699
700 /*
701 * Teardown pid tracker content, but don't free pid_tracker object.
702 */
703 static
704 void fini_pid_tracker(struct ust_pid_tracker *pid_tracker)
705 {
706 struct ust_pid_tracker_node *tracker_node;
707 struct lttng_ht_iter iter;
708
709 if (!pid_tracker->ht) {
710 return;
711 }
712 rcu_read_lock();
713 cds_lfht_for_each_entry(pid_tracker->ht->ht,
714 &iter.iter, tracker_node, node.node) {
715 int ret = lttng_ht_del(pid_tracker->ht, &iter);
716
717 assert(!ret);
718 destroy_pid_tracker_node(tracker_node);
719 }
720 rcu_read_unlock();
721 ht_cleanup_push(pid_tracker->ht);
722 pid_tracker->ht = NULL;
723 }
724
725 static
726 struct ust_pid_tracker_node *pid_tracker_lookup(
727 struct ust_pid_tracker *pid_tracker, int pid,
728 struct lttng_ht_iter *iter)
729 {
730 unsigned long _pid = (unsigned long) pid;
731 struct lttng_ht_node_ulong *node;
732
733 lttng_ht_lookup(pid_tracker->ht, (void *) _pid, iter);
734 node = lttng_ht_iter_get_node_ulong(iter);
735 if (node) {
736 return caa_container_of(node, struct ust_pid_tracker_node,
737 node);
738 } else {
739 return NULL;
740 }
741 }
742
743 static
744 int pid_tracker_add_pid(struct ust_pid_tracker *pid_tracker, int pid)
745 {
746 int retval = LTTNG_OK;
747 struct ust_pid_tracker_node *tracker_node;
748 struct lttng_ht_iter iter;
749
750 if (pid < 0) {
751 retval = LTTNG_ERR_INVALID;
752 goto end;
753 }
754 tracker_node = pid_tracker_lookup(pid_tracker, pid, &iter);
755 if (tracker_node) {
756 /* Already exists. */
757 retval = LTTNG_ERR_PID_TRACKED;
758 goto end;
759 }
760 tracker_node = zmalloc(sizeof(*tracker_node));
761 if (!tracker_node) {
762 retval = LTTNG_ERR_NOMEM;
763 goto end;
764 }
765 lttng_ht_node_init_ulong(&tracker_node->node, (unsigned long) pid);
766 lttng_ht_add_unique_ulong(pid_tracker->ht, &tracker_node->node);
767 end:
768 return retval;
769 }
770
771 static
772 int pid_tracker_del_pid(struct ust_pid_tracker *pid_tracker, int pid)
773 {
774 int retval = LTTNG_OK, ret;
775 struct ust_pid_tracker_node *tracker_node;
776 struct lttng_ht_iter iter;
777
778 if (pid < 0) {
779 retval = LTTNG_ERR_INVALID;
780 goto end;
781 }
782 tracker_node = pid_tracker_lookup(pid_tracker, pid, &iter);
783 if (!tracker_node) {
784 /* Not found */
785 retval = LTTNG_ERR_PID_NOT_TRACKED;
786 goto end;
787 }
788 ret = lttng_ht_del(pid_tracker->ht, &iter);
789 assert(!ret);
790
791 destroy_pid_tracker_node(tracker_node);
792 end:
793 return retval;
794 }
795
796 /*
797 * The session lock is held when calling this function.
798 */
799 int trace_ust_pid_tracker_lookup(struct ltt_ust_session *session, int pid)
800 {
801 struct lttng_ht_iter iter;
802
803 if (!session->pid_tracker.ht) {
804 return 1;
805 }
806 if (pid_tracker_lookup(&session->pid_tracker, pid, &iter)) {
807 return 1;
808 }
809 return 0;
810 }
811
812 /*
813 * Called with the session lock held.
814 */
815 int trace_ust_track_pid(struct ltt_ust_session *session, int pid)
816 {
817 int retval = LTTNG_OK;
818
819 if (pid == -1) {
820 /* Track all pids: destroy tracker if exists. */
821 if (session->pid_tracker.ht) {
822 fini_pid_tracker(&session->pid_tracker);
823 /* Ensure all apps have session. */
824 ust_app_global_update_all(session);
825 }
826 } else {
827 int ret;
828
829 if (!session->pid_tracker.ht) {
830 /* Create tracker. */
831 if (init_pid_tracker(&session->pid_tracker)) {
832 ERR("Error initializing PID tracker");
833 retval = LTTNG_ERR_NOMEM;
834 goto end;
835 }
836 ret = pid_tracker_add_pid(&session->pid_tracker, pid);
837 if (ret != LTTNG_OK) {
838 retval = ret;
839 fini_pid_tracker(&session->pid_tracker);
840 goto end;
841 }
842 /* Remove all apps from session except pid. */
843 ust_app_global_update_all(session);
844 } else {
845 struct ust_app *app;
846
847 ret = pid_tracker_add_pid(&session->pid_tracker, pid);
848 if (ret != LTTNG_OK) {
849 retval = ret;
850 goto end;
851 }
852 /* Add session to application */
853 app = ust_app_find_by_pid(pid);
854 if (app) {
855 ust_app_global_update(session, app);
856 }
857 }
858 }
859 end:
860 return retval;
861 }
862
863 /*
864 * Called with the session lock held.
865 */
866 int trace_ust_untrack_pid(struct ltt_ust_session *session, int pid)
867 {
868 int retval = LTTNG_OK;
869
870 if (pid == -1) {
871 /* Create empty tracker, replace old tracker. */
872 struct ust_pid_tracker tmp_tracker;
873
874 tmp_tracker = session->pid_tracker;
875 if (init_pid_tracker(&session->pid_tracker)) {
876 ERR("Error initializing PID tracker");
877 retval = LTTNG_ERR_NOMEM;
878 /* Rollback operation. */
879 session->pid_tracker = tmp_tracker;
880 goto end;
881 }
882 fini_pid_tracker(&tmp_tracker);
883
884 /* Remove session from all applications */
885 ust_app_global_update_all(session);
886 } else {
887 int ret;
888 struct ust_app *app;
889
890 if (!session->pid_tracker.ht) {
891 /* No PID being tracked. */
892 retval = LTTNG_ERR_PID_NOT_TRACKED;
893 goto end;
894 }
895 /* Remove PID from tracker */
896 ret = pid_tracker_del_pid(&session->pid_tracker, pid);
897 if (ret != LTTNG_OK) {
898 retval = ret;
899 goto end;
900 }
901 /* Remove session from application. */
902 app = ust_app_find_by_pid(pid);
903 if (app) {
904 ust_app_global_update(session, app);
905 }
906 }
907 end:
908 return retval;
909 }
910
911 /*
912 * Called with session lock held.
913 */
914 ssize_t trace_ust_list_tracker_pids(struct ltt_ust_session *session,
915 int32_t **_pids)
916 {
917 struct ust_pid_tracker_node *tracker_node;
918 struct lttng_ht_iter iter;
919 unsigned long count, i = 0;
920 long approx[2];
921 int32_t *pids;
922 int ret = 0;
923
924 if (!session->pid_tracker.ht) {
925 /* Tracker disabled. Set first entry to -1. */
926 pids = zmalloc(sizeof(*pids));
927 if (!pids) {
928 ret = -1;
929 goto end;
930 }
931 pids[0] = -1;
932 *_pids = pids;
933 return 1;
934 }
935
936 rcu_read_lock();
937 cds_lfht_count_nodes(session->pid_tracker.ht->ht,
938 &approx[0], &count, &approx[1]);
939 pids = zmalloc(sizeof(*pids) * count);
940 if (!pids) {
941 ret = -1;
942 goto end;
943 }
944 cds_lfht_for_each_entry(session->pid_tracker.ht->ht,
945 &iter.iter, tracker_node, node.node) {
946 pids[i++] = tracker_node->node.key;
947 }
948 *_pids = pids;
949 ret = count;
950 end:
951 rcu_read_unlock();
952 return ret;
953 }
954
955 /*
956 * RCU safe free context structure.
957 */
958 static void destroy_context_rcu(struct rcu_head *head)
959 {
960 struct lttng_ht_node_ulong *node =
961 caa_container_of(head, struct lttng_ht_node_ulong, head);
962 struct ltt_ust_context *ctx =
963 caa_container_of(node, struct ltt_ust_context, node);
964
965 trace_ust_destroy_context(ctx);
966 }
967
968 /*
969 * Cleanup UST context hash table.
970 */
971 static void destroy_contexts(struct lttng_ht *ht)
972 {
973 int ret;
974 struct lttng_ht_node_ulong *node;
975 struct lttng_ht_iter iter;
976 struct ltt_ust_context *ctx;
977
978 assert(ht);
979
980 rcu_read_lock();
981 cds_lfht_for_each_entry(ht->ht, &iter.iter, node, node) {
982 /* Remove from ordered list. */
983 ctx = caa_container_of(node, struct ltt_ust_context, node);
984 cds_list_del(&ctx->list);
985 /* Remove from channel's hash table. */
986 ret = lttng_ht_del(ht, &iter);
987 if (!ret) {
988 call_rcu(&node->head, destroy_context_rcu);
989 }
990 }
991 rcu_read_unlock();
992
993 ht_cleanup_push(ht);
994 }
995
996 /*
997 * Cleanup ust event structure.
998 */
999 void trace_ust_destroy_event(struct ltt_ust_event *event)
1000 {
1001 assert(event);
1002
1003 DBG2("Trace destroy UST event %s", event->attr.name);
1004 free(event->filter_expression);
1005 free(event->filter);
1006 free(event->exclusion);
1007 free(event);
1008 }
1009
1010 /*
1011 * Cleanup ust context structure.
1012 */
1013 void trace_ust_destroy_context(struct ltt_ust_context *ctx)
1014 {
1015 assert(ctx);
1016
1017 if (ctx->ctx.ctx == LTTNG_UST_CONTEXT_APP_CONTEXT) {
1018 free(ctx->ctx.u.app_ctx.provider_name);
1019 free(ctx->ctx.u.app_ctx.ctx_name);
1020 }
1021 free(ctx);
1022 }
1023
1024 /*
1025 * URCU intermediate call to complete destroy event.
1026 */
1027 static void destroy_event_rcu(struct rcu_head *head)
1028 {
1029 struct lttng_ht_node_str *node =
1030 caa_container_of(head, struct lttng_ht_node_str, head);
1031 struct ltt_ust_event *event =
1032 caa_container_of(node, struct ltt_ust_event, node);
1033
1034 trace_ust_destroy_event(event);
1035 }
1036
1037 /*
1038 * Cleanup UST events hashtable.
1039 */
1040 static void destroy_events(struct lttng_ht *events)
1041 {
1042 int ret;
1043 struct lttng_ht_node_str *node;
1044 struct lttng_ht_iter iter;
1045
1046 assert(events);
1047
1048 rcu_read_lock();
1049 cds_lfht_for_each_entry(events->ht, &iter.iter, node, node) {
1050 ret = lttng_ht_del(events, &iter);
1051 assert(!ret);
1052 call_rcu(&node->head, destroy_event_rcu);
1053 }
1054 rcu_read_unlock();
1055
1056 ht_cleanup_push(events);
1057 }
1058
1059 /*
1060 * Cleanup ust channel structure.
1061 *
1062 * Should _NOT_ be called with RCU read lock held.
1063 */
1064 static void _trace_ust_destroy_channel(struct ltt_ust_channel *channel)
1065 {
1066 assert(channel);
1067
1068 DBG2("Trace destroy UST channel %s", channel->name);
1069
1070 free(channel);
1071 }
1072
1073 /*
1074 * URCU intermediate call to complete destroy channel.
1075 */
1076 static void destroy_channel_rcu(struct rcu_head *head)
1077 {
1078 struct lttng_ht_node_str *node =
1079 caa_container_of(head, struct lttng_ht_node_str, head);
1080 struct ltt_ust_channel *channel =
1081 caa_container_of(node, struct ltt_ust_channel, node);
1082
1083 _trace_ust_destroy_channel(channel);
1084 }
1085
1086 void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
1087 {
1088 /* Destroying all events of the channel */
1089 destroy_events(channel->events);
1090 /* Destroying all context of the channel */
1091 destroy_contexts(channel->ctx);
1092
1093 call_rcu(&channel->node.head, destroy_channel_rcu);
1094 }
1095
1096 /*
1097 * Remove an UST channel from a channel HT.
1098 */
1099 void trace_ust_delete_channel(struct lttng_ht *ht,
1100 struct ltt_ust_channel *channel)
1101 {
1102 int ret;
1103 struct lttng_ht_iter iter;
1104
1105 assert(ht);
1106 assert(channel);
1107
1108 iter.iter.node = &channel->node.node;
1109 ret = lttng_ht_del(ht, &iter);
1110 assert(!ret);
1111 }
1112
1113 /*
1114 * Iterate over a hash table containing channels and cleanup safely.
1115 */
1116 static void destroy_channels(struct lttng_ht *channels)
1117 {
1118 struct lttng_ht_node_str *node;
1119 struct lttng_ht_iter iter;
1120
1121 assert(channels);
1122
1123 rcu_read_lock();
1124 cds_lfht_for_each_entry(channels->ht, &iter.iter, node, node) {
1125 struct ltt_ust_channel *chan =
1126 caa_container_of(node, struct ltt_ust_channel, node);
1127
1128 trace_ust_delete_channel(channels, chan);
1129 trace_ust_destroy_channel(chan);
1130 }
1131 rcu_read_unlock();
1132
1133 ht_cleanup_push(channels);
1134 }
1135
1136 /*
1137 * Cleanup UST global domain.
1138 */
1139 static void destroy_domain_global(struct ltt_ust_domain_global *dom)
1140 {
1141 assert(dom);
1142
1143 destroy_channels(dom->channels);
1144 }
1145
1146 /*
1147 * Cleanup ust session structure
1148 *
1149 * Should *NOT* be called with RCU read-side lock held.
1150 */
1151 void trace_ust_destroy_session(struct ltt_ust_session *session)
1152 {
1153 struct agent *agt;
1154 struct buffer_reg_uid *reg, *sreg;
1155 struct lttng_ht_iter iter;
1156
1157 assert(session);
1158
1159 DBG2("Trace UST destroy session %" PRIu64, session->id);
1160
1161 /* Cleaning up UST domain */
1162 destroy_domain_global(&session->domain_global);
1163
1164 rcu_read_lock();
1165 cds_lfht_for_each_entry(session->agents->ht, &iter.iter, agt, node.node) {
1166 int ret = lttng_ht_del(session->agents, &iter);
1167
1168 assert(!ret);
1169 agent_destroy(agt);
1170 }
1171 rcu_read_unlock();
1172
1173 ht_cleanup_push(session->agents);
1174
1175 /* Cleanup UID buffer registry object(s). */
1176 cds_list_for_each_entry_safe(reg, sreg, &session->buffer_reg_uid_list,
1177 lnode) {
1178 cds_list_del(&reg->lnode);
1179 buffer_reg_uid_remove(reg);
1180 buffer_reg_uid_destroy(reg, session->consumer);
1181 }
1182
1183 consumer_output_put(session->consumer);
1184
1185 fini_pid_tracker(&session->pid_tracker);
1186
1187 free(session);
1188 }
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