2 * Copyright (C) 2022 Jérémie Galarneau <jeremie.galarneau@efficios.com>
4 * SPDX-License-Identifier: GPL-2.0-only
9 #include "lttng-sessiond.hpp"
10 #include "notification-thread-commands.hpp"
11 #include "session.hpp"
12 #include "trace-class.hpp"
13 #include "tsdl-trace-class-visitor.hpp"
14 #include "ctf2-trace-class-visitor.hpp"
15 #include "ust-app.hpp"
16 #include "ust-field-convert.hpp"
17 #include "ust-registry.hpp"
19 #include <common/compat/directory-handle.hpp>
20 #include <common/error.hpp>
21 #include <common/exception.hpp>
22 #include <common/format.hpp>
23 #include <common/hashtable/utils.hpp>
24 #include <common/macros.hpp>
25 #include <common/make-unique.hpp>
26 #include <common/pthread-lock.hpp>
27 #include <common/runas.hpp>
28 #include <common/time.hpp>
29 #include <common/urcu.hpp>
33 #include <initializer_list>
38 namespace ls
= lttng::sessiond
;
39 namespace lst
= lttng::sessiond::trace
;
40 namespace lsu
= lttng::sessiond::ust
;
43 lttng_uuid
generate_uuid_or_throw()
47 if (lttng_uuid_generate(new_uuid
)) {
48 LTTNG_THROW_POSIX("Failed to generate UST uuid", errno
);
54 int get_count_order(unsigned int count
)
58 order
= lttng_fls(count
) - 1;
59 if (count
& (count
- 1)) {
63 LTTNG_ASSERT(order
>= 0);
67 void clear_metadata_file(int fd
)
69 const auto lseek_ret
= lseek(fd
, 0, SEEK_SET
);
71 LTTNG_THROW_POSIX("Failed to seek to the beginning of the metadata file while clearing it", errno
);
74 const auto ret
= ftruncate(fd
, 0);
76 LTTNG_THROW_POSIX("Failed to truncate the metadata file while clearing it", errno
);
81 * Validate that the id has reached the maximum allowed or not.
83 bool is_max_channel_id(uint32_t id
)
85 return id
== UINT32_MAX
;
88 void destroy_channel_rcu(struct rcu_head
*head
)
91 DIAGNOSTIC_IGNORE_INVALID_OFFSETOF
92 lsu::registry_channel
*chan
=
93 lttng::utils::container_of(head
, &lsu::registry_channel::_rcu_head
);
100 * Destroy every element of the registry and free the memory. This does NOT
101 * free the registry pointer since it might not have been allocated before so
102 * it's the caller responsability.
104 * Called from ~registry_session(), must not throw.
106 void destroy_channel(lsu::registry_channel
*chan
, bool notify
) noexcept
108 struct lttng_ht_iter iter
;
109 lttng::sessiond::ust::registry_event
*event
;
110 enum lttng_error_code cmd_ret
;
115 cmd_ret
= notification_thread_command_remove_channel(
116 the_notification_thread_handle
,
117 chan
->_consumer_key
, LTTNG_DOMAIN_UST
);
118 if (cmd_ret
!= LTTNG_OK
) {
119 ERR("Failed to remove channel from notification thread");
124 lttng::urcu::read_lock_guard read_lock_guard
;
126 /* Destroy all event associated with this registry. */
128 DIAGNOSTIC_IGNORE_INVALID_OFFSETOF
129 cds_lfht_for_each_entry(
130 chan
->_events
->ht
, &iter
.iter
, event
, _node
) {
131 /* Delete the node from the ht and free it. */
132 ust_registry_channel_destroy_event(chan
, event
);
137 call_rcu(&chan
->_rcu_head
, destroy_channel_rcu
);
140 void destroy_enum(lsu::registry_enum
*reg_enum
)
149 void destroy_enum_rcu(struct rcu_head
*head
)
152 DIAGNOSTIC_IGNORE_INVALID_OFFSETOF
153 lsu::registry_enum
*reg_enum
=
154 lttng::utils::container_of(head
, &lsu::registry_enum::rcu_head
);
157 destroy_enum(reg_enum
);
161 * Hash table match function for enumerations in the session. Match is
162 * performed on enumeration name, and confirmed by comparing the enum
165 int ht_match_enum(struct cds_lfht_node
*node
, const void *_key
)
167 lsu::registry_enum
*_enum
;
168 const lsu::registry_enum
*key
;
174 DIAGNOSTIC_IGNORE_INVALID_OFFSETOF
175 _enum
= caa_container_of(node
, lsu::registry_enum
,
180 key
= (lsu::registry_enum
*) _key
;
182 return *_enum
== *key
;
186 * Hash table match function for enumerations in the session. Match is
187 * performed by enumeration ID.
189 int ht_match_enum_id(struct cds_lfht_node
*node
, const void *_key
)
191 lsu::registry_enum
*_enum
;
192 const lsu::registry_enum
*key
= (lsu::registry_enum
*) _key
;
198 DIAGNOSTIC_IGNORE_INVALID_OFFSETOF
199 _enum
= caa_container_of(node
, lsu::registry_enum
, node
.node
);
204 if (_enum
->id
!= key
->id
) {
216 * Hash table hash function for enumerations in the session. The
217 * enumeration name is used for hashing.
219 unsigned long ht_hash_enum(void *_key
, unsigned long seed
)
221 lsu::registry_enum
*key
= (lsu::registry_enum
*) _key
;
224 return hash_key_str(key
->name
.c_str(), seed
);
228 void lsu::details::locked_registry_session_release(lsu::registry_session
*session
)
230 pthread_mutex_unlock(&session
->_lock
);
233 lsu::registry_session::registry_session(const struct lst::abi
& in_abi
,
236 const char *root_shm_path
,
237 const char *shm_path
,
240 uint64_t tracing_id
) :
241 lst::trace_class(in_abi
, generate_uuid_or_throw()),
242 _root_shm_path
{root_shm_path
? root_shm_path
: ""},
243 _shm_path
{shm_path
? shm_path
: ""},
244 _metadata_path
{_shm_path
.size() > 0 ? fmt::format("{}/metadata", _shm_path
) :
248 _app_tracer_version
{.major
= major
, .minor
= minor
},
249 _tracing_id
{tracing_id
},
250 _clock
{lttng::make_unique
<lsu::clock_class
>()},
251 _metadata_generating_visitor
{lttng::make_unique
<ls::tsdl::trace_class_visitor
>(
252 abi
, [this](const std::string
& fragment
) {
253 _append_metadata_fragment(fragment
);
255 _packet_header
{_create_packet_header()}
257 pthread_mutex_init(&_lock
, NULL
);
258 if (_shm_path
.size() > 0) {
259 if (run_as_mkdir_recursive(_shm_path
.c_str(), S_IRWXU
| S_IRWXG
, euid
, egid
)) {
260 LTTNG_THROW_POSIX("run_as_mkdir_recursive", errno
);
264 if (_metadata_path
.size() > 0) {
265 /* Create metadata file. */
266 const int ret
= run_as_open(_metadata_path
.c_str(), O_WRONLY
| O_CREAT
| O_EXCL
,
267 S_IRUSR
| S_IWUSR
, euid
, egid
);
269 LTTNG_THROW_POSIX(fmt::format("Failed to open metadata file during registry session creation: path = {}",
270 _metadata_path
), errno
);
276 _enums
.reset(lttng_ht_new(0, LTTNG_HT_TYPE_STRING
));
278 LTTNG_THROW_POSIX("Failed to create enums hash table", ENOMEM
);
281 /* hash/match functions are specified at call site. */
282 _enums
->match_fct
= NULL
;
283 _enums
->hash_fct
= NULL
;
285 _channels
.reset(lttng_ht_new(0, LTTNG_HT_TYPE_U64
));
287 LTTNG_THROW_POSIX("Failed to create channels hash table", ENOMEM
);
291 lst::type::cuptr
lsu::registry_session::_create_packet_header() const
293 lst::structure_type::fields packet_header_fields
;
296 packet_header_fields
.emplace_back(lttng::make_unique
<lst::field
>("magic",
297 lttng::make_unique
<lst::integer_type
>(abi
.uint32_t_alignment
,
298 abi
.byte_order
, 32, lst::integer_type::signedness::UNSIGNED
,
299 lst::integer_type::base::HEXADECIMAL
,
300 std::initializer_list
<lst::integer_type::role
>({lst::integer_type::role::PACKET_MAGIC_NUMBER
}))));
303 packet_header_fields
.emplace_back(lttng::make_unique
<lst::field
>("uuid",
304 lttng::make_unique
<lst::static_length_blob_type
>(0, 16,
305 std::initializer_list
<lst::static_length_blob_type::role
>({lst::static_length_blob_type::role::METADATA_STREAM_UUID
}))));
307 /* uint32_t stream_id */
308 packet_header_fields
.emplace_back(lttng::make_unique
<lst::field
>("stream_id",
309 lttng::make_unique
<lst::integer_type
>(abi
.uint32_t_alignment
,
310 abi
.byte_order
, 32, lst::integer_type::signedness::UNSIGNED
,
311 lst::integer_type::base::DECIMAL
,
312 std::initializer_list
<lst::integer_type::role
>({lst::integer_type::role::DATA_STREAM_CLASS_ID
}))));
314 /* uint64_t stream_instance_id */
315 packet_header_fields
.emplace_back(lttng::make_unique
<lst::field
>("stream_instance_id",
316 lttng::make_unique
<lst::integer_type
>(abi
.uint64_t_alignment
,
317 abi
.byte_order
, 64, lst::integer_type::signedness::UNSIGNED
,
318 lst::integer_type::base::DECIMAL
,
319 std::initializer_list
<lst::integer_type::role
>({lst::integer_type::role::DATA_STREAM_ID
}))));
321 return lttng::make_unique
<lst::structure_type
>(0, std::move(packet_header_fields
));
324 const lst::type
*lsu::registry_session::get_packet_header() const noexcept
326 return _packet_header
.get();
330 * For a given enumeration in a registry, delete the entry and destroy
333 * Note that this is used by ~registry_session() and must not throw.
335 void lsu::registry_session::_destroy_enum(lsu::registry_enum
*reg_enum
) noexcept
338 lttng::urcu::read_lock_guard read_lock_guard
;
340 LTTNG_ASSERT(reg_enum
);
341 ASSERT_RCU_READ_LOCKED();
343 /* Delete the node first. */
344 struct lttng_ht_iter iter
;
345 iter
.iter
.node
= ®_enum
->node
.node
;
346 ret
= lttng_ht_del(_enums
.get(), &iter
);
348 call_rcu(®_enum
->rcu_head
, destroy_enum_rcu
);
351 lsu::registry_session::~registry_session()
354 struct lttng_ht_iter iter
;
355 lsu::registry_channel
*chan
;
356 lsu::registry_enum
*reg_enum
;
358 /* On error, EBUSY can be returned if lock. Code flow error. */
359 ret
= pthread_mutex_destroy(&_lock
);
363 lttng::urcu::read_lock_guard read_lock_guard
;
365 /* Destroy all event associated with this registry. */
367 DIAGNOSTIC_IGNORE_INVALID_OFFSETOF
368 cds_lfht_for_each_entry(_channels
->ht
, &iter
.iter
, chan
, _node
.node
) {
369 /* Delete the node from the ht and free it. */
370 ret
= lttng_ht_del(_channels
.get(), &iter
);
372 destroy_channel(chan
, true);
378 if (_metadata_fd
>= 0) {
379 ret
= close(_metadata_fd
);
384 ret
= run_as_unlink(_metadata_path
.c_str(), _uid
, _gid
);
390 if (_root_shm_path
[0]) {
391 /* Try to delete the directory hierarchy. */
392 (void) run_as_rmdir_recursive(_root_shm_path
.c_str(), _uid
, _gid
,
393 LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG
);
396 /* Destroy the enum hash table */
398 lttng::urcu::read_lock_guard read_lock_guard
;
400 /* Destroy all enum entries associated with this registry. */
402 DIAGNOSTIC_IGNORE_INVALID_OFFSETOF
403 cds_lfht_for_each_entry (_enums
->ht
, &iter
.iter
, reg_enum
, node
.node
) {
404 _destroy_enum(reg_enum
);
410 lsu::registry_session::locked_ptr
lsu::registry_session::lock() noexcept
412 pthread_mutex_lock(&_lock
);
413 return locked_ptr(this);
417 * Initialize registry with default values.
419 void lsu::registry_session::add_channel(uint64_t key
)
421 lttng::pthread::lock_guard
session_lock_guard(_lock
);
424 * Assign a channel ID right now since the event notification comes
425 * *before* the channel notify so the ID needs to be set at this point so
426 * the metadata can be dumped for that event.
428 if (is_max_channel_id(_used_channel_id
)) {
429 LTTNG_THROW_ERROR(fmt::format("Failed to allocate unique id for channel under session while adding channel"));
432 auto chan
= new lsu::registry_channel(
433 _get_next_channel_id(), abi
, _clock
->name
,
434 /* Registered channel listener. */
435 [this](const lsu::registry_channel
& registered_channel
) {
437 * Channel registration completed, serialize it's layout's
440 registered_channel
.accept(*_metadata_generating_visitor
);
442 /* Added event listener. */
443 [this](const lsu::registry_channel
& channel
,
444 const lsu::registry_event
& added_event
) {
446 * The channel and its event classes will be dumped at once when
447 * it is registered. This check prevents event classes from being
448 * declared before their stream class.
450 if (channel
.is_registered()) {
451 added_event
.accept(*_metadata_generating_visitor
);
455 lttng::urcu::read_lock_guard rcu_read_lock_guard
;
456 lttng_ht_node_init_u64(&chan
->_node
, key
);
457 lttng_ht_add_unique_u64(_channels
.get(), &chan
->_node
);
460 lttng::sessiond::ust::registry_channel
& lsu::registry_session::get_channel(
461 uint64_t channel_key
) const
463 lttng::urcu::read_lock_guard read_lock_guard
;
464 struct lttng_ht_node_u64
*node
;
465 struct lttng_ht_iter iter
;
467 ASSERT_LOCKED(_lock
);
469 lttng_ht_lookup(_channels
.get(), &channel_key
, &iter
);
470 node
= lttng_ht_iter_get_node_u64(&iter
);
472 LTTNG_THROW_INVALID_ARGUMENT_ERROR(fmt::format(
473 "Invalid channel key provided: channel key = {}", channel_key
));
477 DIAGNOSTIC_IGNORE_INVALID_OFFSETOF
478 auto chan
= lttng::utils::container_of(node
, &lsu::registry_channel::_node
);
483 void lsu::registry_session::remove_channel(uint64_t channel_key
, bool notify
)
485 struct lttng_ht_iter iter
;
487 lttng::urcu::read_lock_guard read_lock_guard
;
489 ASSERT_LOCKED(_lock
);
490 auto& channel
= get_channel(channel_key
);
492 iter
.iter
.node
= &channel
._node
.node
;
493 ret
= lttng_ht_del(_channels
.get(), &iter
);
495 destroy_channel(&channel
, notify
);
498 void lsu::registry_session::accept(
499 lttng::sessiond::trace::trace_class_environment_visitor
& visitor
) const
501 ASSERT_LOCKED(_lock
);
503 visitor
.visit(lst::environment_field
<const char *>("domain", "ust"));
504 visitor
.visit(lst::environment_field
<const char *>("tracer_name", "lttng-ust"));
505 visitor
.visit(lst::environment_field
<int64_t>("tracer_major", _app_tracer_version
.major
));
506 visitor
.visit(lst::environment_field
<int64_t>("tracer_minor", _app_tracer_version
.minor
));
507 visitor
.visit(lst::environment_field
<const char *>("tracer_buffering_scheme",
508 get_buffering_scheme() == LTTNG_BUFFER_PER_PID
? "pid" : "uid"));
509 visitor
.visit(lst::environment_field
<int64_t>("architecture_bit_width", abi
.bits_per_long
));
512 /* The caller already holds the session and session list locks. */
513 ASSERT_SESSION_LIST_LOCKED();
514 const auto session
= lttng::sessiond::find_session_by_id(_tracing_id
);
516 LTTNG_ASSERT(session
);
517 ASSERT_LOCKED(session
->lock
);
519 visitor
.visit(lst::environment_field
<const char *>("trace_name",
520 session
->has_auto_generated_name
? DEFAULT_SESSION_NAME
:
522 visitor
.visit(lst::environment_field
<std::string
>("trace_creation_datetime",
523 lttng::utils::time_to_iso8601_str(session
->creation_time
)));
524 visitor
.visit(lst::environment_field
<const char *>("hostname", session
->hostname
));
528 void lsu::registry_session::_accept_on_clock_classes(lst::trace_class_visitor
& visitor
) const
530 ASSERT_LOCKED(_lock
);
531 _clock
->accept(visitor
);
534 void lsu::registry_session::_accept_on_stream_classes(lst::trace_class_visitor
& visitor
) const
536 ASSERT_LOCKED(_lock
);
538 std::vector
<const lttng::sessiond::ust::registry_channel
*> sorted_stream_classes
;
541 lttng::urcu::read_lock_guard rcu_lock_guard
;
542 const lsu::registry_channel
*channel
;
543 lttng_ht_iter channel_it
;
546 DIAGNOSTIC_IGNORE_INVALID_OFFSETOF
547 cds_lfht_for_each_entry(_channels
->ht
, &channel_it
.iter
, channel
, _node
.node
) {
548 sorted_stream_classes
.emplace_back(channel
);
553 std::sort(sorted_stream_classes
.begin(), sorted_stream_classes
.end(),
554 [](const lttng::sessiond::ust::registry_channel
*a
,
555 const lttng::sessiond::ust::registry_channel
*b
) {
556 return a
->id
< b
->id
;
559 for (const auto stream_class
: sorted_stream_classes
) {
560 stream_class
->accept(visitor
);
565 * Return next available channel id and increment the used counter. The
566 * is_max_channel_id function MUST be called before in order to validate
567 * if the maximum number of IDs have been reached. If not, it is safe to call
570 * Return a unique channel ID. If max is reached, the used_channel_id counter
573 uint32_t lsu::registry_session::_get_next_channel_id()
575 if (is_max_channel_id(_used_channel_id
)) {
576 return _used_channel_id
;
580 return _next_channel_id
++;
583 void lsu::registry_session::_increase_metadata_size(size_t reservation_length
)
585 const auto new_len
= _metadata_len
+ reservation_length
;
586 auto new_alloc_len
= new_len
;
587 const auto old_alloc_len
= _metadata_alloc_len
;
589 /* Rounding the new allocation length to the next power of 2 would overflow. */
590 if (new_alloc_len
> (UINT32_MAX
>> 1)) {
591 LTTNG_THROW_ERROR("Failed to reserve trace metadata storage as the new size would overflow");
594 /* The current allocation length is already the largest we can afford. */
595 if ((old_alloc_len
<< 1) > (UINT32_MAX
>> 1)) {
596 LTTNG_THROW_ERROR("Failed to reserve trace metadata storage as the max size was already reached");
599 if (new_alloc_len
> old_alloc_len
) {
600 new_alloc_len
= std::max
<size_t>(
601 1U << get_count_order(new_alloc_len
), old_alloc_len
<< 1);
603 auto newptr
= (char *) realloc(_metadata
, new_alloc_len
);
605 LTTNG_THROW_POSIX("Failed to allocate trace metadata storage", errno
);
610 /* We zero directly the memory from start of allocation. */
611 memset(&_metadata
[old_alloc_len
], 0, new_alloc_len
- old_alloc_len
);
612 _metadata_alloc_len
= new_alloc_len
;
615 _metadata_len
+= reservation_length
;
618 void lsu::registry_session::_append_metadata_fragment(const std::string
& fragment
)
620 const auto offset
= _metadata_len
;
622 _increase_metadata_size(fragment
.size());
623 memcpy(&_metadata
[offset
], fragment
.c_str(), fragment
.size());
625 if (_metadata_fd
>= 0) {
626 const auto bytes_written
=
627 lttng_write(_metadata_fd
, fragment
.c_str(), fragment
.size());
629 if (bytes_written
!= fragment
.size()) {
630 LTTNG_THROW_POSIX("Failed to write trace metadata fragment to file",
636 void lsu::registry_session::_reset_metadata()
638 _metadata_len_sent
= 0;
639 memset(_metadata
, 0, _metadata_alloc_len
);
642 if (_metadata_fd
> 0) {
643 /* Clear the metadata file's content. */
644 clear_metadata_file(_metadata_fd
);
648 void lsu::registry_session::_generate_metadata()
650 trace_class::accept(*_metadata_generating_visitor
);
653 void lsu::registry_session::regenerate_metadata()
655 lttng::pthread::lock_guard
registry_lock(_lock
);
657 /* Resample the clock */
658 _clock
= lttng::make_unique
<lsu::clock_class
>();
662 _generate_metadata();
666 * Lookup enumeration by enum ID.
668 * Note that there is no need to lock the registry session as this only
669 * performs an RCU-protected look-up. The function also return an rcu-protected
670 * reference, which ensures that the caller keeps the RCU read lock until it
671 * disposes of the object.
673 lsu::registry_enum::const_rcu_protected_reference
674 lsu::registry_session::get_enumeration(const char *enum_name
, uint64_t enum_id
) const
676 lsu::registry_enum
*reg_enum
= NULL
;
677 struct lttng_ht_node_str
*node
;
678 struct lttng_ht_iter iter
;
679 lttng::urcu::unique_read_lock rcu_lock
;
681 * Hack: only the name is used for hashing; the rest of the attributes
684 lsu::registry_signed_enum
reg_enum_lookup(enum_name
, nullptr, 0);
686 ASSERT_RCU_READ_LOCKED();
688 reg_enum_lookup
.id
= enum_id
;
689 cds_lfht_lookup(_enums
->ht
,
690 ht_hash_enum((void *) ®_enum_lookup
, lttng_ht_seed
),
691 ht_match_enum_id
, ®_enum_lookup
, &iter
.iter
);
692 node
= lttng_ht_iter_get_node_str(&iter
);
694 LTTNG_THROW_PROTOCOL_ERROR(fmt::format(
695 "Unknown enumeration referenced by application event field: enum name = `{}`, enum id = {}",
696 enum_name
, enum_id
));
700 DIAGNOSTIC_IGNORE_INVALID_OFFSETOF
701 reg_enum
= lttng::utils::container_of(node
, &lsu::registry_enum::node
);
704 return lsu::registry_enum::const_rcu_protected_reference
{*reg_enum
, std::move(rcu_lock
)};
708 * Lookup enumeration by name and comparing enumeration entries.
709 * Needs to be called from RCU read-side critical section.
711 lsu::registry_enum
*lsu::registry_session::_lookup_enum(
712 const lsu::registry_enum
*reg_enum_lookup
) const
714 lsu::registry_enum
*reg_enum
= NULL
;
715 struct lttng_ht_node_str
*node
;
716 struct lttng_ht_iter iter
;
718 ASSERT_RCU_READ_LOCKED();
720 cds_lfht_lookup(_enums
->ht
, ht_hash_enum((void *) reg_enum_lookup
, lttng_ht_seed
),
721 ht_match_enum
, reg_enum_lookup
, &iter
.iter
);
722 node
= lttng_ht_iter_get_node_str(&iter
);
728 DIAGNOSTIC_IGNORE_INVALID_OFFSETOF
729 reg_enum
= lttng::utils::container_of(node
, &lsu::registry_enum::node
);
737 * Create a lsu::registry_enum from the given parameters and add it to the
738 * registry hash table, or find it if already there.
740 * Should be called with session registry mutex held.
742 * We receive ownership of entries.
744 void lsu::registry_session::create_or_find_enum(
745 int session_objd
, const char *enum_name
,
746 struct lttng_ust_ctl_enum_entry
*raw_entries
, size_t nr_entries
,
749 struct cds_lfht_node
*nodep
;
750 lsu::registry_enum
*reg_enum
= NULL
, *old_reg_enum
;
751 lttng::urcu::read_lock_guard read_lock_guard
;
752 auto entries
= lttng::make_unique_wrapper
<lttng_ust_ctl_enum_entry
, lttng::free
>(raw_entries
);
754 LTTNG_ASSERT(enum_name
);
757 * This should not happen but since it comes from the UST tracer, an
758 * external party, don't assert and simply validate values.
760 if (session_objd
< 0) {
761 LTTNG_THROW_INVALID_ARGUMENT_ERROR(fmt::format(
762 "Invalid parameters used to create or look-up enumeration from registry session: session_objd = {}",
765 if (nr_entries
== 0) {
766 LTTNG_THROW_INVALID_ARGUMENT_ERROR(fmt::format(
767 "Invalid parameters used to create or look-up enumeration from registry session: nr_entries = {}",
770 if (lttng_strnlen(enum_name
, LTTNG_UST_ABI_SYM_NAME_LEN
) ==
771 LTTNG_UST_ABI_SYM_NAME_LEN
) {
772 LTTNG_THROW_INVALID_ARGUMENT_ERROR(
773 "Invalid parameters used to create or look-up enumeration from registry session: enumeration name is not null terminated");
776 if (entries
->start
.signedness
) {
777 reg_enum
= new lsu::registry_signed_enum(
778 enum_name
, entries
.get(), nr_entries
);
780 reg_enum
= new lsu::registry_unsigned_enum(
781 enum_name
, entries
.get(), nr_entries
);
784 old_reg_enum
= _lookup_enum(reg_enum
);
786 DBG("enum %s already in sess_objd: %u", enum_name
, session_objd
);
787 /* Fall through. Use prior enum. */
788 destroy_enum(reg_enum
);
789 reg_enum
= old_reg_enum
;
791 DBG("UST registry creating enum: %s, sess_objd: %u",
792 enum_name
, session_objd
);
793 if (_next_enum_id
== -1ULL) {
794 destroy_enum(reg_enum
);
795 LTTNG_THROW_ERROR("Failed to allocate unique enumeration ID as it would overflow");
798 reg_enum
->id
= _next_enum_id
++;
799 nodep
= cds_lfht_add_unique(_enums
->ht
,
800 ht_hash_enum(reg_enum
, lttng_ht_seed
),
801 ht_match_enum_id
, reg_enum
,
802 ®_enum
->node
.node
);
803 LTTNG_ASSERT(nodep
== ®_enum
->node
.node
);
806 DBG("UST registry reply with enum %s with id %" PRIu64
" in sess_objd: %u",
807 enum_name
, reg_enum
->id
, session_objd
);
808 *enum_id
= reg_enum
->id
;