2 * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22 #include <common/common.h>
23 #include <common/hashtable/utils.h>
24 #include <lttng/lttng.h>
26 #include "ust-registry.h"
28 #include "ust-field-utils.h"
30 #include "lttng-sessiond.h"
31 #include "notification-thread-commands.h"
35 * Hash table match function for event in the registry.
37 static int ht_match_event(struct cds_lfht_node
*node
, const void *_key
)
39 const struct ust_registry_event
*key
;
40 struct ust_registry_event
*event
;
46 event
= caa_container_of(node
, struct ust_registry_event
, node
.node
);
50 /* It has to be a perfect match. First, compare the event names. */
51 if (strncmp(event
->name
, key
->name
, sizeof(event
->name
))) {
55 /* Compare log levels. */
56 if (event
->loglevel_value
!= key
->loglevel_value
) {
60 /* Compare the number of fields. */
61 if (event
->nr_fields
!= key
->nr_fields
) {
65 /* Compare each field individually. */
66 for (i
= 0; i
< event
->nr_fields
; i
++) {
67 if (!match_ustctl_field(&event
->fields
[i
], &key
->fields
[i
])) {
72 /* Compare model URI. */
73 if (event
->model_emf_uri
!= NULL
&& key
->model_emf_uri
== NULL
) {
75 } else if(event
->model_emf_uri
== NULL
&& key
->model_emf_uri
!= NULL
) {
77 } else if (event
->model_emf_uri
!= NULL
&& key
->model_emf_uri
!= NULL
) {
78 if (strcmp(event
->model_emf_uri
, key
->model_emf_uri
)) {
90 static unsigned long ht_hash_event(const void *_key
, unsigned long seed
)
93 const struct ust_registry_event
*key
= _key
;
97 hashed_key
= (uint64_t) hash_key_str(key
->name
, seed
);
99 return hash_key_u64(&hashed_key
, seed
);
102 static int compare_enums(const struct ust_registry_enum
*reg_enum_a
,
103 const struct ust_registry_enum
*reg_enum_b
)
108 assert(strcmp(reg_enum_a
->name
, reg_enum_b
->name
) == 0);
109 if (reg_enum_a
->nr_entries
!= reg_enum_b
->nr_entries
) {
113 for (i
= 0; i
< reg_enum_a
->nr_entries
; i
++) {
114 const struct ustctl_enum_entry
*entries_a
, *entries_b
;
116 entries_a
= ®_enum_a
->entries
[i
];
117 entries_b
= ®_enum_b
->entries
[i
];
118 if (entries_a
->start
.value
!= entries_b
->start
.value
) {
122 if (entries_a
->end
.value
!= entries_b
->end
.value
) {
126 if (entries_a
->start
.signedness
!= entries_b
->start
.signedness
) {
130 if (entries_a
->end
.signedness
!= entries_b
->end
.signedness
) {
135 if (strcmp(entries_a
->string
, entries_b
->string
)) {
145 * Hash table match function for enumerations in the session. Match is
146 * performed on enumeration name, and confirmed by comparing the enum
149 static int ht_match_enum(struct cds_lfht_node
*node
, const void *_key
)
151 struct ust_registry_enum
*_enum
;
152 const struct ust_registry_enum
*key
;
157 _enum
= caa_container_of(node
, struct ust_registry_enum
,
162 if (strncmp(_enum
->name
, key
->name
, LTTNG_UST_SYM_NAME_LEN
)) {
165 if (compare_enums(_enum
, key
)) {
177 * Hash table match function for enumerations in the session. Match is
178 * performed by enumeration ID.
180 static int ht_match_enum_id(struct cds_lfht_node
*node
, const void *_key
)
182 struct ust_registry_enum
*_enum
;
183 const struct ust_registry_enum
*key
= _key
;
188 _enum
= caa_container_of(node
, struct ust_registry_enum
, node
.node
);
191 if (_enum
->id
!= key
->id
) {
203 * Hash table hash function for enumerations in the session. The
204 * enumeration name is used for hashing.
206 static unsigned long ht_hash_enum(void *_key
, unsigned long seed
)
208 struct ust_registry_enum
*key
= _key
;
211 return hash_key_str(key
->name
, seed
);
215 * Return negative value on error, 0 if OK.
217 * TODO: we could add stricter verification of more types to catch
218 * errors in liblttng-ust implementation earlier than consumption by the
222 int validate_event_field(struct ustctl_field
*field
,
223 const char *event_name
,
228 switch(field
->type
.atype
) {
229 case ustctl_atype_integer
:
230 case ustctl_atype_enum
:
231 case ustctl_atype_array
:
232 case ustctl_atype_sequence
:
233 case ustctl_atype_string
:
234 case ustctl_atype_variant
:
236 case ustctl_atype_struct
:
237 if (field
->type
.u
._struct
.nr_fields
!= 0) {
238 WARN("Unsupported non-empty struct field.");
244 case ustctl_atype_float
:
245 switch (field
->type
.u
.basic
._float
.mant_dig
) {
247 WARN("UST application '%s' (pid: %d) has unknown float mantissa '%u' "
248 "in field '%s', rejecting event '%s'",
250 field
->type
.u
.basic
._float
.mant_dig
,
269 int validate_event_fields(size_t nr_fields
, struct ustctl_field
*fields
,
270 const char *event_name
, struct ust_app
*app
)
274 for (i
= 0; i
< nr_fields
; i
++) {
275 if (validate_event_field(&fields
[i
], event_name
, app
) < 0)
282 * Allocate event and initialize it. This does NOT set a valid event id from a
285 static struct ust_registry_event
*alloc_event(int session_objd
,
286 int channel_objd
, char *name
, char *sig
, size_t nr_fields
,
287 struct ustctl_field
*fields
, int loglevel_value
,
288 char *model_emf_uri
, struct ust_app
*app
)
290 struct ust_registry_event
*event
= NULL
;
293 * Ensure that the field content is valid.
295 if (validate_event_fields(nr_fields
, fields
, name
, app
) < 0) {
299 event
= zmalloc(sizeof(*event
));
301 PERROR("zmalloc ust registry event");
305 event
->session_objd
= session_objd
;
306 event
->channel_objd
= channel_objd
;
307 /* Allocated by ustctl. */
308 event
->signature
= sig
;
309 event
->nr_fields
= nr_fields
;
310 event
->fields
= fields
;
311 event
->loglevel_value
= loglevel_value
;
312 event
->model_emf_uri
= model_emf_uri
;
314 /* Copy event name and force NULL byte. */
315 strncpy(event
->name
, name
, sizeof(event
->name
));
316 event
->name
[sizeof(event
->name
) - 1] = '\0';
318 cds_lfht_node_init(&event
->node
.node
);
325 * Free event data structure. This does NOT delete it from any hash table. It's
326 * safe to pass a NULL pointer. This shoudl be called inside a call RCU if the
327 * event is previously deleted from a rcu hash table.
329 static void destroy_event(struct ust_registry_event
*event
)
336 free(event
->model_emf_uri
);
337 free(event
->signature
);
342 * Destroy event function call of the call RCU.
344 static void destroy_event_rcu(struct rcu_head
*head
)
346 struct lttng_ht_node_u64
*node
=
347 caa_container_of(head
, struct lttng_ht_node_u64
, head
);
348 struct ust_registry_event
*event
=
349 caa_container_of(node
, struct ust_registry_event
, node
);
351 destroy_event(event
);
355 * Find an event using the name and signature in the given registry. RCU read
356 * side lock MUST be acquired before calling this function and as long as the
357 * event reference is kept by the caller.
359 * On success, the event pointer is returned else NULL.
361 struct ust_registry_event
*ust_registry_find_event(
362 struct ust_registry_channel
*chan
, char *name
, char *sig
)
364 struct lttng_ht_node_u64
*node
;
365 struct lttng_ht_iter iter
;
366 struct ust_registry_event
*event
= NULL
;
367 struct ust_registry_event key
;
373 /* Setup key for the match function. */
374 strncpy(key
.name
, name
, sizeof(key
.name
));
375 key
.name
[sizeof(key
.name
) - 1] = '\0';
378 cds_lfht_lookup(chan
->ht
->ht
, chan
->ht
->hash_fct(&key
, lttng_ht_seed
),
379 chan
->ht
->match_fct
, &key
, &iter
.iter
);
380 node
= lttng_ht_iter_get_node_u64(&iter
);
384 event
= caa_container_of(node
, struct ust_registry_event
, node
);
391 * Create a ust_registry_event from the given parameters and add it to the
392 * registry hash table. If event_id is valid, it is set with the newly created
395 * On success, return 0 else a negative value. The created event MUST be unique
396 * so on duplicate entry -EINVAL is returned. On error, event_id is untouched.
398 * Should be called with session registry mutex held.
400 int ust_registry_create_event(struct ust_registry_session
*session
,
401 uint64_t chan_key
, int session_objd
, int channel_objd
, char *name
,
402 char *sig
, size_t nr_fields
, struct ustctl_field
*fields
,
403 int loglevel_value
, char *model_emf_uri
, int buffer_type
,
404 uint32_t *event_id_p
, struct ust_app
*app
)
408 struct cds_lfht_node
*nptr
;
409 struct ust_registry_event
*event
= NULL
;
410 struct ust_registry_channel
*chan
;
420 * This should not happen but since it comes from the UST tracer, an
421 * external party, don't assert and simply validate values.
423 if (session_objd
< 0 || channel_objd
< 0) {
428 chan
= ust_registry_channel_find(session
, chan_key
);
434 /* Check if we've reached the maximum possible id. */
435 if (ust_registry_is_max_id(chan
->used_event_id
)) {
440 event
= alloc_event(session_objd
, channel_objd
, name
, sig
, nr_fields
,
441 fields
, loglevel_value
, model_emf_uri
, app
);
447 DBG3("UST registry creating event with event: %s, sig: %s, id: %u, "
448 "chan_objd: %u, sess_objd: %u, chan_id: %u", event
->name
,
449 event
->signature
, event
->id
, event
->channel_objd
,
450 event
->session_objd
, chan
->chan_id
);
453 * This is an add unique with a custom match function for event. The node
454 * are matched using the event name and signature.
456 nptr
= cds_lfht_add_unique(chan
->ht
->ht
, chan
->ht
->hash_fct(event
,
457 lttng_ht_seed
), chan
->ht
->match_fct
, event
, &event
->node
.node
);
458 if (nptr
!= &event
->node
.node
) {
459 if (buffer_type
== LTTNG_BUFFER_PER_UID
) {
461 * This is normal, we just have to send the event id of the
462 * returned node and make sure we destroy the previously allocated
465 destroy_event(event
);
466 event
= caa_container_of(nptr
, struct ust_registry_event
,
469 event_id
= event
->id
;
471 ERR("UST registry create event add unique failed for event: %s, "
472 "sig: %s, id: %u, chan_objd: %u, sess_objd: %u",
473 event
->name
, event
->signature
, event
->id
,
474 event
->channel_objd
, event
->session_objd
);
479 /* Request next event id if the node was successfully added. */
480 event_id
= event
->id
= ust_registry_get_next_event_id(chan
);
483 *event_id_p
= event_id
;
485 if (!event
->metadata_dumped
) {
486 /* Append to metadata */
487 ret
= ust_metadata_event_statedump(session
, chan
, event
);
489 ERR("Error appending event metadata (errno = %d)", ret
);
504 destroy_event(event
);
509 * For a given event in a registry, delete the entry and destroy the event.
510 * This MUST be called within a RCU read side lock section.
512 void ust_registry_destroy_event(struct ust_registry_channel
*chan
,
513 struct ust_registry_event
*event
)
516 struct lttng_ht_iter iter
;
521 /* Delete the node first. */
522 iter
.iter
.node
= &event
->node
.node
;
523 ret
= lttng_ht_del(chan
->ht
, &iter
);
526 call_rcu(&event
->node
.head
, destroy_event_rcu
);
531 static void destroy_enum(struct ust_registry_enum
*reg_enum
)
536 free(reg_enum
->entries
);
540 static void destroy_enum_rcu(struct rcu_head
*head
)
542 struct ust_registry_enum
*reg_enum
=
543 caa_container_of(head
, struct ust_registry_enum
, rcu_head
);
545 destroy_enum(reg_enum
);
549 * Lookup enumeration by name and comparing enumeration entries.
550 * Needs to be called from RCU read-side critical section.
552 struct ust_registry_enum
*
553 ust_registry_lookup_enum(struct ust_registry_session
*session
,
554 const struct ust_registry_enum
*reg_enum_lookup
)
556 struct ust_registry_enum
*reg_enum
= NULL
;
557 struct lttng_ht_node_str
*node
;
558 struct lttng_ht_iter iter
;
560 cds_lfht_lookup(session
->enums
->ht
,
561 ht_hash_enum((void *) reg_enum_lookup
, lttng_ht_seed
),
562 ht_match_enum
, reg_enum_lookup
, &iter
.iter
);
563 node
= lttng_ht_iter_get_node_str(&iter
);
567 reg_enum
= caa_container_of(node
, struct ust_registry_enum
, node
);
573 * Lookup enumeration by enum ID.
574 * Needs to be called from RCU read-side critical section.
576 struct ust_registry_enum
*
577 ust_registry_lookup_enum_by_id(struct ust_registry_session
*session
,
578 const char *enum_name
, uint64_t enum_id
)
580 struct ust_registry_enum
*reg_enum
= NULL
;
581 struct lttng_ht_node_str
*node
;
582 struct lttng_ht_iter iter
;
583 struct ust_registry_enum reg_enum_lookup
;
585 memset(®_enum_lookup
, 0, sizeof(reg_enum_lookup
));
586 strncpy(reg_enum_lookup
.name
, enum_name
, LTTNG_UST_SYM_NAME_LEN
);
587 reg_enum_lookup
.name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
588 reg_enum_lookup
.id
= enum_id
;
589 cds_lfht_lookup(session
->enums
->ht
,
590 ht_hash_enum((void *) ®_enum_lookup
, lttng_ht_seed
),
591 ht_match_enum_id
, ®_enum_lookup
, &iter
.iter
);
592 node
= lttng_ht_iter_get_node_str(&iter
);
596 reg_enum
= caa_container_of(node
, struct ust_registry_enum
, node
);
602 * Create a ust_registry_enum from the given parameters and add it to the
603 * registry hash table, or find it if already there.
605 * On success, return 0 else a negative value.
607 * Should be called with session registry mutex held.
609 * We receive ownership of entries.
611 int ust_registry_create_or_find_enum(struct ust_registry_session
*session
,
612 int session_objd
, char *enum_name
,
613 struct ustctl_enum_entry
*entries
, size_t nr_entries
,
617 struct cds_lfht_node
*nodep
;
618 struct ust_registry_enum
*reg_enum
= NULL
, *old_reg_enum
;
626 * This should not happen but since it comes from the UST tracer, an
627 * external party, don't assert and simply validate values.
629 if (session_objd
< 0) {
634 /* Check if the enumeration was already dumped */
635 reg_enum
= zmalloc(sizeof(*reg_enum
));
637 PERROR("zmalloc ust registry enumeration");
641 strncpy(reg_enum
->name
, enum_name
, LTTNG_UST_SYM_NAME_LEN
);
642 reg_enum
->name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
643 /* entries will be owned by reg_enum. */
644 reg_enum
->entries
= entries
;
645 reg_enum
->nr_entries
= nr_entries
;
648 old_reg_enum
= ust_registry_lookup_enum(session
, reg_enum
);
650 DBG("enum %s already in sess_objd: %u", enum_name
, session_objd
);
651 /* Fall through. Use prior enum. */
652 destroy_enum(reg_enum
);
653 reg_enum
= old_reg_enum
;
655 DBG("UST registry creating enum: %s, sess_objd: %u",
656 enum_name
, session_objd
);
657 if (session
->next_enum_id
== -1ULL) {
659 destroy_enum(reg_enum
);
662 reg_enum
->id
= session
->next_enum_id
++;
663 cds_lfht_node_init(®_enum
->node
.node
);
664 nodep
= cds_lfht_add_unique(session
->enums
->ht
,
665 ht_hash_enum(reg_enum
, lttng_ht_seed
),
666 ht_match_enum_id
, reg_enum
,
667 ®_enum
->node
.node
);
668 assert(nodep
== ®_enum
->node
.node
);
670 DBG("UST registry reply with enum %s with id %" PRIu64
" in sess_objd: %u",
671 enum_name
, reg_enum
->id
, session_objd
);
672 *enum_id
= reg_enum
->id
;
680 * For a given enumeration in a registry, delete the entry and destroy
682 * This MUST be called within a RCU read side lock section.
684 void ust_registry_destroy_enum(struct ust_registry_session
*reg_session
,
685 struct ust_registry_enum
*reg_enum
)
688 struct lttng_ht_iter iter
;
693 /* Delete the node first. */
694 iter
.iter
.node
= ®_enum
->node
.node
;
695 ret
= lttng_ht_del(reg_session
->enums
, &iter
);
697 call_rcu(®_enum
->rcu_head
, destroy_enum_rcu
);
701 * We need to execute ht_destroy outside of RCU read-side critical
702 * section and outside of call_rcu thread, so we postpone its execution
703 * using ht_cleanup_push. It is simpler than to change the semantic of
704 * the many callers of delete_ust_app_session().
707 void destroy_channel_rcu(struct rcu_head
*head
)
709 struct ust_registry_channel
*chan
=
710 caa_container_of(head
, struct ust_registry_channel
, rcu_head
);
713 ht_cleanup_push(chan
->ht
);
715 free(chan
->ctx_fields
);
720 * Destroy every element of the registry and free the memory. This does NOT
721 * free the registry pointer since it might not have been allocated before so
722 * it's the caller responsability.
724 static void destroy_channel(struct ust_registry_channel
*chan
, bool notif
)
726 struct lttng_ht_iter iter
;
727 struct ust_registry_event
*event
;
728 enum lttng_error_code cmd_ret
;
733 cmd_ret
= notification_thread_command_remove_channel(
734 notification_thread_handle
, chan
->consumer_key
,
736 if (cmd_ret
!= LTTNG_OK
) {
737 ERR("Failed to remove channel from notification thread");
742 /* Destroy all event associated with this registry. */
743 cds_lfht_for_each_entry(chan
->ht
->ht
, &iter
.iter
, event
, node
.node
) {
744 /* Delete the node from the ht and free it. */
745 ust_registry_destroy_event(chan
, event
);
748 call_rcu(&chan
->rcu_head
, destroy_channel_rcu
);
752 * Initialize registry with default values.
754 int ust_registry_channel_add(struct ust_registry_session
*session
,
758 struct ust_registry_channel
*chan
;
762 chan
= zmalloc(sizeof(*chan
));
764 PERROR("zmalloc ust registry channel");
769 chan
->ht
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
775 /* Set custom match function. */
776 chan
->ht
->match_fct
= ht_match_event
;
777 chan
->ht
->hash_fct
= ht_hash_event
;
780 * Assign a channel ID right now since the event notification comes
781 * *before* the channel notify so the ID needs to be set at this point so
782 * the metadata can be dumped for that event.
784 if (ust_registry_is_max_id(session
->used_channel_id
)) {
788 chan
->chan_id
= ust_registry_get_next_chan_id(session
);
791 lttng_ht_node_init_u64(&chan
->node
, key
);
792 lttng_ht_add_unique_u64(session
->channels
, &chan
->node
);
798 destroy_channel(chan
, false);
804 * Find a channel in the given registry. RCU read side lock MUST be acquired
805 * before calling this function and as long as the event reference is kept by
808 * On success, the pointer is returned else NULL.
810 struct ust_registry_channel
*ust_registry_channel_find(
811 struct ust_registry_session
*session
, uint64_t key
)
813 struct lttng_ht_node_u64
*node
;
814 struct lttng_ht_iter iter
;
815 struct ust_registry_channel
*chan
= NULL
;
818 assert(session
->channels
);
820 DBG3("UST registry channel finding key %" PRIu64
, key
);
822 lttng_ht_lookup(session
->channels
, &key
, &iter
);
823 node
= lttng_ht_iter_get_node_u64(&iter
);
827 chan
= caa_container_of(node
, struct ust_registry_channel
, node
);
834 * Remove channel using key from registry and free memory.
836 void ust_registry_channel_del_free(struct ust_registry_session
*session
,
837 uint64_t key
, bool notif
)
839 struct lttng_ht_iter iter
;
840 struct ust_registry_channel
*chan
;
846 chan
= ust_registry_channel_find(session
, key
);
852 iter
.iter
.node
= &chan
->node
.node
;
853 ret
= lttng_ht_del(session
->channels
, &iter
);
856 destroy_channel(chan
, notif
);
863 * Initialize registry with default values and set the newly allocated session
864 * pointer to sessionp.
866 * Return 0 on success and sessionp is set or else return -1 and sessionp is
869 int ust_registry_session_init(struct ust_registry_session
**sessionp
,
871 uint32_t bits_per_long
,
872 uint32_t uint8_t_alignment
,
873 uint32_t uint16_t_alignment
,
874 uint32_t uint32_t_alignment
,
875 uint32_t uint64_t_alignment
,
876 uint32_t long_alignment
,
880 const char *root_shm_path
,
881 const char *shm_path
,
888 struct ust_registry_session
*session
;
892 session
= zmalloc(sizeof(*session
));
894 PERROR("zmalloc ust registry session");
898 pthread_mutex_init(&session
->lock
, NULL
);
899 session
->bits_per_long
= bits_per_long
;
900 session
->uint8_t_alignment
= uint8_t_alignment
;
901 session
->uint16_t_alignment
= uint16_t_alignment
;
902 session
->uint32_t_alignment
= uint32_t_alignment
;
903 session
->uint64_t_alignment
= uint64_t_alignment
;
904 session
->long_alignment
= long_alignment
;
905 session
->byte_order
= byte_order
;
906 session
->metadata_fd
= -1;
909 session
->next_enum_id
= 0;
910 session
->major
= major
;
911 session
->minor
= minor
;
912 strncpy(session
->root_shm_path
, root_shm_path
,
913 sizeof(session
->root_shm_path
));
914 session
->root_shm_path
[sizeof(session
->root_shm_path
) - 1] = '\0';
916 strncpy(session
->shm_path
, shm_path
,
917 sizeof(session
->shm_path
));
918 session
->shm_path
[sizeof(session
->shm_path
) - 1] = '\0';
919 strncpy(session
->metadata_path
, shm_path
,
920 sizeof(session
->metadata_path
));
921 session
->metadata_path
[sizeof(session
->metadata_path
) - 1] = '\0';
922 strncat(session
->metadata_path
, "/metadata",
923 sizeof(session
->metadata_path
)
924 - strlen(session
->metadata_path
) - 1);
926 if (session
->shm_path
[0]) {
927 ret
= run_as_mkdir_recursive(session
->shm_path
,
931 PERROR("run_as_mkdir_recursive");
935 if (session
->metadata_path
[0]) {
936 /* Create metadata file */
937 ret
= run_as_open(session
->metadata_path
,
938 O_WRONLY
| O_CREAT
| O_EXCL
,
939 S_IRUSR
| S_IWUSR
, euid
, egid
);
941 PERROR("Opening metadata file");
944 session
->metadata_fd
= ret
;
947 session
->enums
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
948 if (!session
->enums
) {
949 ERR("Failed to create enums hash table");
952 /* hash/match functions are specified at call site. */
953 session
->enums
->match_fct
= NULL
;
954 session
->enums
->hash_fct
= NULL
;
956 session
->channels
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
957 if (!session
->channels
) {
961 ret
= lttng_uuid_generate(session
->uuid
);
963 ERR("Failed to generate UST uuid (errno = %d)", ret
);
967 session
->tracing_id
= tracing_id
;
968 session
->tracing_uid
= tracing_uid
;
970 pthread_mutex_lock(&session
->lock
);
971 ret
= ust_metadata_session_statedump(session
, app
, major
, minor
);
972 pthread_mutex_unlock(&session
->lock
);
974 ERR("Failed to generate session metadata (errno = %d)", ret
);
983 ust_registry_session_destroy(session
);
990 * Destroy session registry. This does NOT free the given pointer since it
991 * might get passed as a reference. The registry lock should NOT be acquired.
993 void ust_registry_session_destroy(struct ust_registry_session
*reg
)
996 struct lttng_ht_iter iter
;
997 struct ust_registry_channel
*chan
;
998 struct ust_registry_enum
*reg_enum
;
1004 /* On error, EBUSY can be returned if lock. Code flow error. */
1005 ret
= pthread_mutex_destroy(®
->lock
);
1008 if (reg
->channels
) {
1010 /* Destroy all event associated with this registry. */
1011 cds_lfht_for_each_entry(reg
->channels
->ht
, &iter
.iter
, chan
,
1013 /* Delete the node from the ht and free it. */
1014 ret
= lttng_ht_del(reg
->channels
, &iter
);
1016 destroy_channel(chan
, true);
1019 ht_cleanup_push(reg
->channels
);
1022 free(reg
->metadata
);
1023 if (reg
->metadata_fd
>= 0) {
1024 ret
= close(reg
->metadata_fd
);
1028 ret
= run_as_unlink(reg
->metadata_path
,
1029 reg
->uid
, reg
->gid
);
1034 if (reg
->root_shm_path
[0]) {
1036 * Try deleting the directory hierarchy.
1038 (void) run_as_rmdir_recursive(reg
->root_shm_path
,
1040 LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG
);
1042 /* Destroy the enum hash table */
1045 /* Destroy all enum entries associated with this registry. */
1046 cds_lfht_for_each_entry(reg
->enums
->ht
, &iter
.iter
, reg_enum
,
1048 ust_registry_destroy_enum(reg
, reg_enum
);
1051 ht_cleanup_push(reg
->enums
);