4 * Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
6 * Holds LTTng per-session event registry.
8 * Dual LGPL v2.1/GPL v2 license.
14 #include <urcu/list.h>
15 #include <urcu/hlist.h>
17 #include <uuid/uuid.h>
25 #include <urcu/compiler.h>
26 #include <urcu/uatomic.h>
27 #include <urcu/arch.h>
29 #include <lttng/tracepoint.h>
30 #include <lttng/ust-events.h>
32 #include <usterr-signal-safe.h>
36 #include "ltt-tracer.h"
37 #include "ltt-tracer-core.h"
39 #include "../libringbuffer/shm.h"
43 * The sessions mutex is the centralized mutex across UST tracing
44 * control and probe registration. All operations within this file are
45 * called by the communication thread, under ust_lock protection.
47 static pthread_mutex_t sessions_mutex
= PTHREAD_MUTEX_INITIALIZER
;
51 pthread_mutex_lock(&sessions_mutex
);
56 pthread_mutex_unlock(&sessions_mutex
);
59 static CDS_LIST_HEAD(sessions
);
62 * Pending probes hash table, containing the registered ltt events for
63 * which tracepoint probes are still missing. Protected by the sessions
66 #define PENDING_PROBE_HASH_BITS 6
67 #define PENDING_PROBE_HASH_SIZE (1 << PENDING_PROBE_HASH_BITS)
68 static struct cds_hlist_head pending_probe_table
[PENDING_PROBE_HASH_SIZE
];
70 struct ust_pending_probe
{
71 struct ltt_event
*event
;
72 struct cds_hlist_node node
;
76 static void _ltt_event_destroy(struct ltt_event
*event
);
77 static void _ltt_loglevel_destroy(struct loglevel_entry
*entry
);
78 static void _ltt_channel_destroy(struct ltt_channel
*chan
);
79 static int _ltt_event_unregister(struct ltt_event
*event
);
81 int _ltt_event_metadata_statedump(struct ltt_session
*session
,
82 struct ltt_channel
*chan
,
83 struct ltt_event
*event
);
85 int _ltt_session_metadata_statedump(struct ltt_session
*session
);
88 * called at event creation if probe is missing.
89 * called with session mutex held.
92 int add_pending_probe(struct ltt_event
*event
, const char *name
)
94 struct cds_hlist_head
*head
;
95 struct ust_pending_probe
*e
;
96 size_t name_len
= strlen(name
) + 1;
97 uint32_t hash
= jhash(name
, name_len
- 1, 0);
99 head
= &pending_probe_table
[hash
& (PENDING_PROBE_HASH_SIZE
- 1)];
100 e
= zmalloc(sizeof(struct ust_pending_probe
) + name_len
);
103 memcpy(&e
->name
[0], name
, name_len
);
104 cds_hlist_add_head(&e
->node
, head
);
106 event
->pending_probe
= e
;
111 * remove a pending probe. called when at event teardown and when an
112 * event is fixed (probe is loaded).
113 * called with session mutex held.
116 void remove_pending_probe(struct ust_pending_probe
*e
)
120 cds_hlist_del(&e
->node
);
125 * Called at library load: connect the probe on the events pending on
127 * called with session mutex held.
129 int pending_probe_fix_events(const struct lttng_event_desc
*desc
)
131 struct cds_hlist_head
*head
;
132 struct cds_hlist_node
*node
, *p
;
133 struct ust_pending_probe
*e
;
134 const char *name
= desc
->name
;
135 size_t name_len
= strlen(name
) + 1;
136 uint32_t hash
= jhash(name
, name_len
- 1, 0);
140 * For this event, we need to lookup the loglevel. If active (in
141 * the active loglevels hash table), we must create the event.
144 head
= &pending_probe_table
[hash
& (PENDING_PROBE_HASH_SIZE
- 1)];
145 cds_hlist_for_each_entry_safe(e
, node
, p
, head
, node
) {
146 struct ltt_event
*event
;
147 struct ltt_channel
*chan
;
149 if (strcmp(name
, e
->name
))
153 assert(!event
->desc
);
155 event
->pending_probe
= NULL
;
156 remove_pending_probe(e
);
157 ret
|= __tracepoint_probe_register(name
,
158 event
->desc
->probe_callback
,
162 event
->id
= chan
->free_event_id
++;
163 ret
|= _ltt_event_metadata_statedump(chan
->session
, chan
,
169 void synchronize_trace(void)
174 struct ltt_session
*ltt_session_create(void)
176 struct ltt_session
*session
;
178 session
= zmalloc(sizeof(struct ltt_session
));
181 CDS_INIT_LIST_HEAD(&session
->chan
);
182 CDS_INIT_LIST_HEAD(&session
->events
);
183 CDS_INIT_LIST_HEAD(&session
->loglevels
);
184 uuid_generate(session
->uuid
);
185 cds_list_add(&session
->list
, &sessions
);
189 void ltt_session_destroy(struct ltt_session
*session
)
191 struct ltt_channel
*chan
, *tmpchan
;
192 struct ltt_event
*event
, *tmpevent
;
193 struct loglevel_entry
*loglevel
, *tmploglevel
;
196 CMM_ACCESS_ONCE(session
->active
) = 0;
197 cds_list_for_each_entry(event
, &session
->events
, list
) {
198 ret
= _ltt_event_unregister(event
);
201 synchronize_trace(); /* Wait for in-flight events to complete */
202 cds_list_for_each_entry_safe(loglevel
, tmploglevel
, &session
->loglevels
, list
)
203 _ltt_loglevel_destroy(loglevel
);
204 cds_list_for_each_entry_safe(event
, tmpevent
, &session
->events
, list
)
205 _ltt_event_destroy(event
);
206 cds_list_for_each_entry_safe(chan
, tmpchan
, &session
->chan
, list
)
207 _ltt_channel_destroy(chan
);
208 cds_list_del(&session
->list
);
212 int ltt_session_enable(struct ltt_session
*session
)
215 struct ltt_channel
*chan
;
217 if (session
->active
) {
223 * Snapshot the number of events per channel to know the type of header
226 cds_list_for_each_entry(chan
, &session
->chan
, list
) {
227 if (chan
->header_type
)
228 continue; /* don't change it if session stop/restart */
229 if (chan
->free_event_id
< 31)
230 chan
->header_type
= 1; /* compact */
232 chan
->header_type
= 2; /* large */
235 CMM_ACCESS_ONCE(session
->active
) = 1;
236 CMM_ACCESS_ONCE(session
->been_active
) = 1;
237 ret
= _ltt_session_metadata_statedump(session
);
239 CMM_ACCESS_ONCE(session
->active
) = 0;
244 int ltt_session_disable(struct ltt_session
*session
)
248 if (!session
->active
) {
252 CMM_ACCESS_ONCE(session
->active
) = 0;
257 int ltt_channel_enable(struct ltt_channel
*channel
)
261 if (channel
== channel
->session
->metadata
)
263 old
= uatomic_xchg(&channel
->enabled
, 1);
269 int ltt_channel_disable(struct ltt_channel
*channel
)
273 if (channel
== channel
->session
->metadata
)
275 old
= uatomic_xchg(&channel
->enabled
, 0);
281 int ltt_event_enable(struct ltt_event
*event
)
285 if (event
->chan
== event
->chan
->session
->metadata
)
287 old
= uatomic_xchg(&event
->enabled
, 1);
293 int ltt_event_disable(struct ltt_event
*event
)
297 if (event
->chan
== event
->chan
->session
->metadata
)
299 old
= uatomic_xchg(&event
->enabled
, 0);
305 struct ltt_channel
*ltt_channel_create(struct ltt_session
*session
,
306 const char *transport_name
,
308 size_t subbuf_size
, size_t num_subbuf
,
309 unsigned int switch_timer_interval
,
310 unsigned int read_timer_interval
,
311 int *shm_fd
, int *wait_fd
,
312 uint64_t *memory_map_size
,
313 struct ltt_channel
*chan_priv_init
)
315 struct ltt_channel
*chan
= NULL
;
316 struct ltt_transport
*transport
;
318 if (session
->been_active
)
319 goto active
; /* Refuse to add channel to active session */
320 transport
= ltt_transport_find(transport_name
);
322 DBG("LTTng transport %s not found\n",
326 chan_priv_init
->id
= session
->free_chan_id
++;
327 chan_priv_init
->session
= session
;
329 * Note: the channel creation op already writes into the packet
330 * headers. Therefore the "chan" information used as input
331 * should be already accessible.
333 chan
= transport
->ops
.channel_create("[lttng]", buf_addr
,
334 subbuf_size
, num_subbuf
, switch_timer_interval
,
335 read_timer_interval
, shm_fd
, wait_fd
,
336 memory_map_size
, chan_priv_init
);
340 chan
->ops
= &transport
->ops
;
341 cds_list_add(&chan
->list
, &session
->chan
);
351 * Only used internally at session destruction.
354 void _ltt_channel_destroy(struct ltt_channel
*chan
)
356 cds_list_del(&chan
->list
);
357 lttng_destroy_context(chan
->ctx
);
358 chan
->ops
->channel_destroy(chan
);
361 int ltt_loglevel_create(struct ltt_channel
*chan
,
362 struct lttng_ust_event
*event_param
,
363 struct loglevel_entry
**_entry
)
365 struct loglevel_entry
*entry
;
367 entry
= add_loglevel(event_param
->name
, chan
, event_param
);
368 if (!entry
|| IS_ERR(entry
)) {
369 return PTR_ERR(entry
);
376 void _ltt_loglevel_destroy(struct loglevel_entry
*entry
)
378 _remove_loglevel(entry
);
382 * Supports event creation while tracing session is active.
384 int ltt_event_create(struct ltt_channel
*chan
,
385 struct lttng_ust_event
*event_param
,
387 struct ltt_event
**_event
)
389 struct ltt_event
*event
;
392 if (chan
->used_event_id
== -1UL) {
397 * This is O(n^2) (for each event, the loop is called at event
398 * creation). Might require a hash if we have lots of events.
400 cds_list_for_each_entry(event
, &chan
->session
->events
, list
) {
401 if (event
->desc
&& !strcmp(event
->desc
->name
, event_param
->name
)) {
406 event
= zmalloc(sizeof(struct ltt_event
));
412 event
->filter
= filter
;
414 * used_event_id counts the maximum number of event IDs that can
415 * register if all probes register.
417 chan
->used_event_id
++;
419 event
->instrumentation
= event_param
->instrumentation
;
420 /* Populate ltt_event structure before tracepoint registration. */
422 switch (event_param
->instrumentation
) {
423 case LTTNG_UST_TRACEPOINT
:
424 event
->desc
= ltt_event_get(event_param
->name
);
426 ret
= __tracepoint_probe_register(event_param
->name
,
427 event
->desc
->probe_callback
,
431 event
->id
= chan
->free_event_id
++;
434 * If the probe is not present, event->desc stays NULL,
435 * waiting for the probe to register, and the event->id
438 ret
= add_pending_probe(event
, event_param
->name
);
440 goto add_pending_error
;
443 case LTTNG_UST_TRACEPOINT_LOGLEVEL
:
450 ret
= _ltt_event_metadata_statedump(chan
->session
, chan
, event
);
452 goto statedump_error
;
454 cds_list_add(&event
->list
, &chan
->session
->events
);
460 WARN_ON_ONCE(__tracepoint_probe_unregister(event_param
->name
,
461 event
->desc
->probe_callback
,
463 ltt_event_put(event
->desc
);
475 * Only used internally at session destruction.
477 int _ltt_event_unregister(struct ltt_event
*event
)
481 switch (event
->instrumentation
) {
482 case LTTNG_UST_TRACEPOINT
:
484 ret
= __tracepoint_probe_unregister(event
->desc
->name
,
485 event
->desc
->probe_callback
,
490 remove_pending_probe(event
->pending_probe
);
501 * Only used internally at session destruction.
504 void _ltt_event_destroy(struct ltt_event
*event
)
506 switch (event
->instrumentation
) {
507 case LTTNG_UST_TRACEPOINT
:
509 ltt_event_put(event
->desc
);
515 cds_list_del(&event
->list
);
516 lttng_destroy_context(event
->ctx
);
521 * We have exclusive access to our metadata buffer (protected by the
522 * ust_lock), so we can do racy operations such as looking for
523 * remaining space left in packet and write, since mutual exclusion
524 * protects us from concurrent writes.
526 int lttng_metadata_printf(struct ltt_session
*session
,
527 const char *fmt
, ...)
529 struct lttng_ust_lib_ring_buffer_ctx ctx
;
530 struct ltt_channel
*chan
= session
->metadata
;
532 int ret
= 0, waitret
;
533 size_t len
, reserve_len
, pos
;
536 WARN_ON_ONCE(!CMM_ACCESS_ONCE(session
->active
));
539 ret
= vasprintf(&str
, fmt
, ap
);
547 for (pos
= 0; pos
< len
; pos
+= reserve_len
) {
548 reserve_len
= min_t(size_t,
549 chan
->ops
->packet_avail_size(chan
->chan
, chan
->handle
),
551 lib_ring_buffer_ctx_init(&ctx
, chan
->chan
, NULL
, reserve_len
,
552 sizeof(char), -1, chan
->handle
);
554 * We don't care about metadata buffer's records lost
555 * count, because we always retry here. Report error if
556 * we need to bail out after timeout or being
559 waitret
= wait_cond_interruptible_timeout(
561 ret
= chan
->ops
->event_reserve(&ctx
, 0);
562 ret
!= -ENOBUFS
|| !ret
;
564 LTTNG_METADATA_TIMEOUT_MSEC
);
565 if (waitret
== -ETIMEDOUT
|| waitret
== -EINTR
|| ret
) {
566 DBG("LTTng: Failure to write metadata to buffers (%s)\n",
567 waitret
== -EINTR
? "interrupted" :
568 (ret
== -ENOBUFS
? "timeout" : "I/O error"));
569 if (waitret
== -EINTR
)
573 chan
->ops
->event_write(&ctx
, &str
[pos
], reserve_len
);
574 chan
->ops
->event_commit(&ctx
);
582 int _ltt_field_statedump(struct ltt_session
*session
,
583 const struct lttng_event_field
*field
)
587 switch (field
->type
.atype
) {
589 ret
= lttng_metadata_printf(session
,
590 " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n",
591 field
->type
.u
.basic
.integer
.size
,
592 field
->type
.u
.basic
.integer
.alignment
,
593 field
->type
.u
.basic
.integer
.signedness
,
594 (field
->type
.u
.basic
.integer
.encoding
== lttng_encode_none
)
596 : (field
->type
.u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
599 field
->type
.u
.basic
.integer
.base
,
600 #if (BYTE_ORDER == BIG_ENDIAN)
601 field
->type
.u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
603 field
->type
.u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
608 ret
= lttng_metadata_printf(session
,
609 " floating_point { exp_dig = %u; mant_dig = %u; align = %u;%s } _%s;\n",
610 field
->type
.u
.basic
._float
.exp_dig
,
611 field
->type
.u
.basic
._float
.mant_dig
,
612 field
->type
.u
.basic
._float
.alignment
,
613 #if (BYTE_ORDER == BIG_ENDIAN)
614 field
->type
.u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
616 field
->type
.u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
621 ret
= lttng_metadata_printf(session
,
623 field
->type
.u
.basic
.enumeration
.name
,
628 const struct lttng_basic_type
*elem_type
;
630 elem_type
= &field
->type
.u
.array
.elem_type
;
631 ret
= lttng_metadata_printf(session
,
632 " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n",
633 elem_type
->u
.basic
.integer
.size
,
634 elem_type
->u
.basic
.integer
.alignment
,
635 elem_type
->u
.basic
.integer
.signedness
,
636 (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
638 : (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
641 elem_type
->u
.basic
.integer
.base
,
642 #if (BYTE_ORDER == BIG_ENDIAN)
643 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
645 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
647 field
->name
, field
->type
.u
.array
.length
);
652 const struct lttng_basic_type
*elem_type
;
653 const struct lttng_basic_type
*length_type
;
655 elem_type
= &field
->type
.u
.sequence
.elem_type
;
656 length_type
= &field
->type
.u
.sequence
.length_type
;
657 ret
= lttng_metadata_printf(session
,
658 " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n",
659 length_type
->u
.basic
.integer
.size
,
660 (unsigned int) length_type
->u
.basic
.integer
.alignment
,
661 length_type
->u
.basic
.integer
.signedness
,
662 (length_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
664 : ((length_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
667 length_type
->u
.basic
.integer
.base
,
668 #if (BYTE_ORDER == BIG_ENDIAN)
669 length_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
671 length_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
677 ret
= lttng_metadata_printf(session
,
678 " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n",
679 elem_type
->u
.basic
.integer
.size
,
680 (unsigned int) elem_type
->u
.basic
.integer
.alignment
,
681 elem_type
->u
.basic
.integer
.signedness
,
682 (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
684 : ((elem_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
687 elem_type
->u
.basic
.integer
.base
,
688 #if (BYTE_ORDER == BIG_ENDIAN)
689 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
691 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
699 /* Default encoding is UTF8 */
700 ret
= lttng_metadata_printf(session
,
702 field
->type
.u
.basic
.string
.encoding
== lttng_encode_ASCII
?
703 " { encoding = ASCII; }" : "",
714 int _ltt_context_metadata_statedump(struct ltt_session
*session
,
715 struct lttng_ctx
*ctx
)
722 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
723 const struct lttng_ctx_field
*field
= &ctx
->fields
[i
];
725 ret
= _ltt_field_statedump(session
, &field
->event_field
);
733 int _ltt_fields_metadata_statedump(struct ltt_session
*session
,
734 struct ltt_event
*event
)
736 const struct lttng_event_desc
*desc
= event
->desc
;
740 for (i
= 0; i
< desc
->nr_fields
; i
++) {
741 const struct lttng_event_field
*field
= &desc
->fields
[i
];
743 ret
= _ltt_field_statedump(session
, field
);
751 int _ltt_event_metadata_statedump(struct ltt_session
*session
,
752 struct ltt_channel
*chan
,
753 struct ltt_event
*event
)
757 if (event
->metadata_dumped
|| !CMM_ACCESS_ONCE(session
->active
))
759 if (chan
== session
->metadata
)
762 * Don't print events for which probe load is pending.
767 ret
= lttng_metadata_printf(session
,
771 " stream_id = %u;\n",
779 ret
= lttng_metadata_printf(session
,
780 " context := struct {\n");
784 ret
= _ltt_context_metadata_statedump(session
, event
->ctx
);
788 ret
= lttng_metadata_printf(session
,
794 ret
= lttng_metadata_printf(session
,
795 " fields := struct {\n"
800 ret
= _ltt_fields_metadata_statedump(session
, event
);
805 * LTTng space reservation can only reserve multiples of the
808 ret
= lttng_metadata_printf(session
,
814 event
->metadata_dumped
= 1;
821 int _ltt_channel_metadata_statedump(struct ltt_session
*session
,
822 struct ltt_channel
*chan
)
826 if (chan
->metadata_dumped
|| !CMM_ACCESS_ONCE(session
->active
))
828 if (chan
== session
->metadata
)
831 WARN_ON_ONCE(!chan
->header_type
);
832 ret
= lttng_metadata_printf(session
,
835 " event.header := %s;\n"
836 " packet.context := struct packet_context;\n",
838 chan
->header_type
== 1 ? "struct event_header_compact" :
839 "struct event_header_large");
844 ret
= lttng_metadata_printf(session
,
845 " event.context := struct {\n");
849 ret
= _ltt_context_metadata_statedump(session
, chan
->ctx
);
853 ret
= lttng_metadata_printf(session
,
859 ret
= lttng_metadata_printf(session
,
862 chan
->metadata_dumped
= 1;
868 int _ltt_stream_packet_context_declare(struct ltt_session
*session
)
870 return lttng_metadata_printf(session
,
871 "struct packet_context {\n"
872 " uint64_t timestamp_begin;\n"
873 " uint64_t timestamp_end;\n"
874 " uint32_t events_discarded;\n"
875 " uint32_t content_size;\n"
876 " uint32_t packet_size;\n"
877 " uint32_t cpu_id;\n"
885 * id 31 is reserved to indicate an extended header.
888 * id: range: 0 - 65534.
889 * id 65535 is reserved to indicate an extended header.
892 int _ltt_event_header_declare(struct ltt_session
*session
)
894 return lttng_metadata_printf(session
,
895 "struct event_header_compact {\n"
896 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
899 " uint27_t timestamp;\n"
903 " uint64_t timestamp;\n"
908 "struct event_header_large {\n"
909 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
912 " uint32_t timestamp;\n"
916 " uint64_t timestamp;\n"
920 lttng_alignof(uint32_t) * CHAR_BIT
,
921 lttng_alignof(uint16_t) * CHAR_BIT
926 * Output metadata into this session's metadata buffers.
929 int _ltt_session_metadata_statedump(struct ltt_session
*session
)
931 unsigned char *uuid_c
= session
->uuid
;
933 struct ltt_channel
*chan
;
934 struct ltt_event
*event
;
937 if (!CMM_ACCESS_ONCE(session
->active
))
939 if (session
->metadata_dumped
)
941 if (!session
->metadata
) {
942 DBG("LTTng: attempt to start tracing, but metadata channel is not found. Operation abort.\n");
946 snprintf(uuid_s
, sizeof(uuid_s
),
947 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
948 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
949 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
950 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
951 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
953 ret
= lttng_metadata_printf(session
,
954 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
955 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
956 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
957 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
958 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
959 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
965 " byte_order = %s;\n"
966 " packet.header := struct {\n"
968 " uint8_t uuid[16];\n"
969 " uint32_t stream_id;\n"
972 lttng_alignof(uint8_t) * CHAR_BIT
,
973 lttng_alignof(uint16_t) * CHAR_BIT
,
974 lttng_alignof(uint32_t) * CHAR_BIT
,
975 lttng_alignof(uint64_t) * CHAR_BIT
,
979 #if (BYTE_ORDER == BIG_ENDIAN)
988 ret
= _ltt_stream_packet_context_declare(session
);
992 ret
= _ltt_event_header_declare(session
);
997 cds_list_for_each_entry(chan
, &session
->chan
, list
) {
998 ret
= _ltt_channel_metadata_statedump(session
, chan
);
1003 cds_list_for_each_entry(event
, &session
->events
, list
) {
1004 ret
= _ltt_event_metadata_statedump(session
, event
->chan
, event
);
1008 session
->metadata_dumped
= 1;
1013 void lttng_ust_events_exit(void)
1015 struct ltt_session
*session
, *tmpsession
;
1017 cds_list_for_each_entry_safe(session
, tmpsession
, &sessions
, list
)
1018 ltt_session_destroy(session
);