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 session_loglevel
*sl
);
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);
138 struct lttng_ust_event event_param
;
141 * For this event, we need to lookup the loglevel. If active (in
142 * the active loglevels hash table), we must create the event.
144 if (desc
->loglevel
) {
145 const struct tracepoint_loglevel_entry
*ev_ll
;
146 struct loglevel_entry
*loglevel
;
148 ev_ll
= *desc
->loglevel
;
149 loglevel
= get_loglevel(ev_ll
->identifier
);
151 loglevel
= get_loglevel_value(ev_ll
->value
);
153 struct session_loglevel
*sl
;
155 cds_list_for_each_entry(sl
, &loglevel
->session_list
,
157 struct ltt_event
*ev
;
160 memcpy(&event_param
, &sl
->event_param
,
161 sizeof(event_param
));
162 memcpy(event_param
.name
,
164 sizeof(event_param
.name
));
166 ret
= ltt_event_create(sl
->chan
,
170 DBG("Error creating event");
173 cds_list_add(&ev
->loglevel_list
,
179 head
= &pending_probe_table
[hash
& (PENDING_PROBE_HASH_SIZE
- 1)];
180 cds_hlist_for_each_entry_safe(e
, node
, p
, head
, node
) {
181 struct ltt_event
*event
;
182 struct ltt_channel
*chan
;
184 if (strcmp(name
, e
->name
))
188 assert(!event
->desc
);
190 event
->pending_probe
= NULL
;
191 remove_pending_probe(e
);
192 ret
|= __tracepoint_probe_register(name
,
193 event
->desc
->probe_callback
,
197 event
->id
= chan
->free_event_id
++;
198 ret
|= _ltt_event_metadata_statedump(chan
->session
, chan
,
204 void synchronize_trace(void)
209 struct ltt_session
*ltt_session_create(void)
211 struct ltt_session
*session
;
213 session
= zmalloc(sizeof(struct ltt_session
));
216 CDS_INIT_LIST_HEAD(&session
->chan
);
217 CDS_INIT_LIST_HEAD(&session
->events
);
218 CDS_INIT_LIST_HEAD(&session
->loglevels
);
219 uuid_generate(session
->uuid
);
220 cds_list_add(&session
->list
, &sessions
);
224 void ltt_session_destroy(struct ltt_session
*session
)
226 struct ltt_channel
*chan
, *tmpchan
;
227 struct ltt_event
*event
, *tmpevent
;
228 struct session_loglevel
*loglevel
, *tmploglevel
;
231 CMM_ACCESS_ONCE(session
->active
) = 0;
232 cds_list_for_each_entry(event
, &session
->events
, list
) {
233 ret
= _ltt_event_unregister(event
);
236 synchronize_trace(); /* Wait for in-flight events to complete */
237 cds_list_for_each_entry_safe(loglevel
, tmploglevel
, &session
->loglevels
, list
)
238 _ltt_loglevel_destroy(loglevel
);
239 cds_list_for_each_entry_safe(event
, tmpevent
, &session
->events
, list
)
240 _ltt_event_destroy(event
);
241 cds_list_for_each_entry_safe(chan
, tmpchan
, &session
->chan
, list
)
242 _ltt_channel_destroy(chan
);
243 cds_list_del(&session
->list
);
247 int ltt_session_enable(struct ltt_session
*session
)
250 struct ltt_channel
*chan
;
252 if (session
->active
) {
258 * Snapshot the number of events per channel to know the type of header
261 cds_list_for_each_entry(chan
, &session
->chan
, list
) {
262 if (chan
->header_type
)
263 continue; /* don't change it if session stop/restart */
264 if (chan
->free_event_id
< 31)
265 chan
->header_type
= 1; /* compact */
267 chan
->header_type
= 2; /* large */
270 CMM_ACCESS_ONCE(session
->active
) = 1;
271 CMM_ACCESS_ONCE(session
->been_active
) = 1;
272 ret
= _ltt_session_metadata_statedump(session
);
274 CMM_ACCESS_ONCE(session
->active
) = 0;
279 int ltt_session_disable(struct ltt_session
*session
)
283 if (!session
->active
) {
287 CMM_ACCESS_ONCE(session
->active
) = 0;
292 int ltt_channel_enable(struct ltt_channel
*channel
)
296 if (channel
== channel
->session
->metadata
)
298 old
= uatomic_xchg(&channel
->enabled
, 1);
304 int ltt_channel_disable(struct ltt_channel
*channel
)
308 if (channel
== channel
->session
->metadata
)
310 old
= uatomic_xchg(&channel
->enabled
, 0);
316 int ltt_event_enable(struct ltt_event
*event
)
320 if (event
->chan
== event
->chan
->session
->metadata
)
322 old
= uatomic_xchg(&event
->enabled
, 1);
328 int ltt_event_disable(struct ltt_event
*event
)
332 if (event
->chan
== event
->chan
->session
->metadata
)
334 old
= uatomic_xchg(&event
->enabled
, 0);
340 struct ltt_channel
*ltt_channel_create(struct ltt_session
*session
,
341 const char *transport_name
,
343 size_t subbuf_size
, size_t num_subbuf
,
344 unsigned int switch_timer_interval
,
345 unsigned int read_timer_interval
,
346 int *shm_fd
, int *wait_fd
,
347 uint64_t *memory_map_size
,
348 struct ltt_channel
*chan_priv_init
)
350 struct ltt_channel
*chan
= NULL
;
351 struct ltt_transport
*transport
;
353 if (session
->been_active
)
354 goto active
; /* Refuse to add channel to active session */
355 transport
= ltt_transport_find(transport_name
);
357 DBG("LTTng transport %s not found\n",
361 chan_priv_init
->id
= session
->free_chan_id
++;
362 chan_priv_init
->session
= session
;
364 * Note: the channel creation op already writes into the packet
365 * headers. Therefore the "chan" information used as input
366 * should be already accessible.
368 chan
= transport
->ops
.channel_create("[lttng]", buf_addr
,
369 subbuf_size
, num_subbuf
, switch_timer_interval
,
370 read_timer_interval
, shm_fd
, wait_fd
,
371 memory_map_size
, chan_priv_init
);
375 chan
->ops
= &transport
->ops
;
376 cds_list_add(&chan
->list
, &session
->chan
);
386 * Only used internally at session destruction.
389 void _ltt_channel_destroy(struct ltt_channel
*chan
)
391 cds_list_del(&chan
->list
);
392 lttng_destroy_context(chan
->ctx
);
393 chan
->ops
->channel_destroy(chan
);
396 int ltt_loglevel_create(struct ltt_channel
*chan
,
397 struct lttng_ust_event
*event_param
,
398 struct session_loglevel
**_sl
)
400 struct session_loglevel
*sl
;
402 sl
= add_loglevel(event_param
->name
, chan
, event_param
);
403 if (!sl
|| IS_ERR(sl
)) {
411 void _ltt_loglevel_destroy(struct session_loglevel
*sl
)
413 _remove_loglevel(sl
);
417 * Supports event creation while tracing session is active.
419 int ltt_event_create(struct ltt_channel
*chan
,
420 struct lttng_ust_event
*event_param
,
422 struct ltt_event
**_event
)
424 struct ltt_event
*event
;
427 if (chan
->used_event_id
== -1UL) {
432 * This is O(n^2) (for each event, the loop is called at event
433 * creation). Might require a hash if we have lots of events.
435 cds_list_for_each_entry(event
, &chan
->session
->events
, list
) {
436 if (event
->desc
&& !strcmp(event
->desc
->name
, event_param
->name
)) {
441 event
= zmalloc(sizeof(struct ltt_event
));
447 event
->filter
= filter
;
449 * used_event_id counts the maximum number of event IDs that can
450 * register if all probes register.
452 chan
->used_event_id
++;
454 event
->instrumentation
= event_param
->instrumentation
;
455 /* Populate ltt_event structure before tracepoint registration. */
457 switch (event_param
->instrumentation
) {
458 case LTTNG_UST_TRACEPOINT
:
459 event
->desc
= ltt_event_get(event_param
->name
);
461 ret
= __tracepoint_probe_register(event_param
->name
,
462 event
->desc
->probe_callback
,
466 event
->id
= chan
->free_event_id
++;
469 * If the probe is not present, event->desc stays NULL,
470 * waiting for the probe to register, and the event->id
473 ret
= add_pending_probe(event
, event_param
->name
);
475 goto add_pending_error
;
478 case LTTNG_UST_TRACEPOINT_LOGLEVEL
:
485 ret
= _ltt_event_metadata_statedump(chan
->session
, chan
, event
);
487 goto statedump_error
;
489 cds_list_add(&event
->list
, &chan
->session
->events
);
495 WARN_ON_ONCE(__tracepoint_probe_unregister(event_param
->name
,
496 event
->desc
->probe_callback
,
498 ltt_event_put(event
->desc
);
510 * Only used internally at session destruction.
512 int _ltt_event_unregister(struct ltt_event
*event
)
516 switch (event
->instrumentation
) {
517 case LTTNG_UST_TRACEPOINT
:
519 ret
= __tracepoint_probe_unregister(event
->desc
->name
,
520 event
->desc
->probe_callback
,
525 remove_pending_probe(event
->pending_probe
);
536 * Only used internally at session destruction.
539 void _ltt_event_destroy(struct ltt_event
*event
)
541 switch (event
->instrumentation
) {
542 case LTTNG_UST_TRACEPOINT
:
544 ltt_event_put(event
->desc
);
550 cds_list_del(&event
->list
);
551 lttng_destroy_context(event
->ctx
);
556 * We have exclusive access to our metadata buffer (protected by the
557 * ust_lock), so we can do racy operations such as looking for
558 * remaining space left in packet and write, since mutual exclusion
559 * protects us from concurrent writes.
561 int lttng_metadata_printf(struct ltt_session
*session
,
562 const char *fmt
, ...)
564 struct lttng_ust_lib_ring_buffer_ctx ctx
;
565 struct ltt_channel
*chan
= session
->metadata
;
567 int ret
= 0, waitret
;
568 size_t len
, reserve_len
, pos
;
571 WARN_ON_ONCE(!CMM_ACCESS_ONCE(session
->active
));
574 ret
= vasprintf(&str
, fmt
, ap
);
582 for (pos
= 0; pos
< len
; pos
+= reserve_len
) {
583 reserve_len
= min_t(size_t,
584 chan
->ops
->packet_avail_size(chan
->chan
, chan
->handle
),
586 lib_ring_buffer_ctx_init(&ctx
, chan
->chan
, NULL
, reserve_len
,
587 sizeof(char), -1, chan
->handle
);
589 * We don't care about metadata buffer's records lost
590 * count, because we always retry here. Report error if
591 * we need to bail out after timeout or being
594 waitret
= wait_cond_interruptible_timeout(
596 ret
= chan
->ops
->event_reserve(&ctx
, 0);
597 ret
!= -ENOBUFS
|| !ret
;
599 LTTNG_METADATA_TIMEOUT_MSEC
);
600 if (waitret
== -ETIMEDOUT
|| waitret
== -EINTR
|| ret
) {
601 DBG("LTTng: Failure to write metadata to buffers (%s)\n",
602 waitret
== -EINTR
? "interrupted" :
603 (ret
== -ENOBUFS
? "timeout" : "I/O error"));
604 if (waitret
== -EINTR
)
608 chan
->ops
->event_write(&ctx
, &str
[pos
], reserve_len
);
609 chan
->ops
->event_commit(&ctx
);
617 int _ltt_field_statedump(struct ltt_session
*session
,
618 const struct lttng_event_field
*field
)
622 switch (field
->type
.atype
) {
624 ret
= lttng_metadata_printf(session
,
625 " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n",
626 field
->type
.u
.basic
.integer
.size
,
627 field
->type
.u
.basic
.integer
.alignment
,
628 field
->type
.u
.basic
.integer
.signedness
,
629 (field
->type
.u
.basic
.integer
.encoding
== lttng_encode_none
)
631 : (field
->type
.u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
634 field
->type
.u
.basic
.integer
.base
,
635 #if (BYTE_ORDER == BIG_ENDIAN)
636 field
->type
.u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
638 field
->type
.u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
643 ret
= lttng_metadata_printf(session
,
644 " floating_point { exp_dig = %u; mant_dig = %u; align = %u;%s } _%s;\n",
645 field
->type
.u
.basic
._float
.exp_dig
,
646 field
->type
.u
.basic
._float
.mant_dig
,
647 field
->type
.u
.basic
._float
.alignment
,
648 #if (BYTE_ORDER == BIG_ENDIAN)
649 field
->type
.u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
651 field
->type
.u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
656 ret
= lttng_metadata_printf(session
,
658 field
->type
.u
.basic
.enumeration
.name
,
663 const struct lttng_basic_type
*elem_type
;
665 elem_type
= &field
->type
.u
.array
.elem_type
;
666 ret
= lttng_metadata_printf(session
,
667 " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n",
668 elem_type
->u
.basic
.integer
.size
,
669 elem_type
->u
.basic
.integer
.alignment
,
670 elem_type
->u
.basic
.integer
.signedness
,
671 (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
673 : (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
676 elem_type
->u
.basic
.integer
.base
,
677 #if (BYTE_ORDER == BIG_ENDIAN)
678 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
680 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
682 field
->name
, field
->type
.u
.array
.length
);
687 const struct lttng_basic_type
*elem_type
;
688 const struct lttng_basic_type
*length_type
;
690 elem_type
= &field
->type
.u
.sequence
.elem_type
;
691 length_type
= &field
->type
.u
.sequence
.length_type
;
692 ret
= lttng_metadata_printf(session
,
693 " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n",
694 length_type
->u
.basic
.integer
.size
,
695 (unsigned int) length_type
->u
.basic
.integer
.alignment
,
696 length_type
->u
.basic
.integer
.signedness
,
697 (length_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
699 : ((length_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
702 length_type
->u
.basic
.integer
.base
,
703 #if (BYTE_ORDER == BIG_ENDIAN)
704 length_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
706 length_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
712 ret
= lttng_metadata_printf(session
,
713 " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n",
714 elem_type
->u
.basic
.integer
.size
,
715 (unsigned int) elem_type
->u
.basic
.integer
.alignment
,
716 elem_type
->u
.basic
.integer
.signedness
,
717 (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
719 : ((elem_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
722 elem_type
->u
.basic
.integer
.base
,
723 #if (BYTE_ORDER == BIG_ENDIAN)
724 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
726 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
734 /* Default encoding is UTF8 */
735 ret
= lttng_metadata_printf(session
,
737 field
->type
.u
.basic
.string
.encoding
== lttng_encode_ASCII
?
738 " { encoding = ASCII; }" : "",
749 int _ltt_context_metadata_statedump(struct ltt_session
*session
,
750 struct lttng_ctx
*ctx
)
757 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
758 const struct lttng_ctx_field
*field
= &ctx
->fields
[i
];
760 ret
= _ltt_field_statedump(session
, &field
->event_field
);
768 int _ltt_fields_metadata_statedump(struct ltt_session
*session
,
769 struct ltt_event
*event
)
771 const struct lttng_event_desc
*desc
= event
->desc
;
775 for (i
= 0; i
< desc
->nr_fields
; i
++) {
776 const struct lttng_event_field
*field
= &desc
->fields
[i
];
778 ret
= _ltt_field_statedump(session
, field
);
786 int _ltt_event_metadata_statedump(struct ltt_session
*session
,
787 struct ltt_channel
*chan
,
788 struct ltt_event
*event
)
792 if (event
->metadata_dumped
|| !CMM_ACCESS_ONCE(session
->active
))
794 if (chan
== session
->metadata
)
797 * Don't print events for which probe load is pending.
802 ret
= lttng_metadata_printf(session
,
806 " stream_id = %u;\n",
814 ret
= lttng_metadata_printf(session
,
815 " context := struct {\n");
819 ret
= _ltt_context_metadata_statedump(session
, event
->ctx
);
823 ret
= lttng_metadata_printf(session
,
829 ret
= lttng_metadata_printf(session
,
830 " fields := struct {\n"
835 ret
= _ltt_fields_metadata_statedump(session
, event
);
840 * LTTng space reservation can only reserve multiples of the
843 ret
= lttng_metadata_printf(session
,
849 event
->metadata_dumped
= 1;
856 int _ltt_channel_metadata_statedump(struct ltt_session
*session
,
857 struct ltt_channel
*chan
)
861 if (chan
->metadata_dumped
|| !CMM_ACCESS_ONCE(session
->active
))
863 if (chan
== session
->metadata
)
866 WARN_ON_ONCE(!chan
->header_type
);
867 ret
= lttng_metadata_printf(session
,
870 " event.header := %s;\n"
871 " packet.context := struct packet_context;\n",
873 chan
->header_type
== 1 ? "struct event_header_compact" :
874 "struct event_header_large");
879 ret
= lttng_metadata_printf(session
,
880 " event.context := struct {\n");
884 ret
= _ltt_context_metadata_statedump(session
, chan
->ctx
);
888 ret
= lttng_metadata_printf(session
,
894 ret
= lttng_metadata_printf(session
,
897 chan
->metadata_dumped
= 1;
903 int _ltt_stream_packet_context_declare(struct ltt_session
*session
)
905 return lttng_metadata_printf(session
,
906 "struct packet_context {\n"
907 " uint64_t timestamp_begin;\n"
908 " uint64_t timestamp_end;\n"
909 " uint32_t events_discarded;\n"
910 " uint32_t content_size;\n"
911 " uint32_t packet_size;\n"
912 " uint32_t cpu_id;\n"
920 * id 31 is reserved to indicate an extended header.
923 * id: range: 0 - 65534.
924 * id 65535 is reserved to indicate an extended header.
927 int _ltt_event_header_declare(struct ltt_session
*session
)
929 return lttng_metadata_printf(session
,
930 "struct event_header_compact {\n"
931 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
934 " uint27_t timestamp;\n"
938 " uint64_t timestamp;\n"
943 "struct event_header_large {\n"
944 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
947 " uint32_t timestamp;\n"
951 " uint64_t timestamp;\n"
955 lttng_alignof(uint32_t) * CHAR_BIT
,
956 lttng_alignof(uint16_t) * CHAR_BIT
961 * Output metadata into this session's metadata buffers.
964 int _ltt_session_metadata_statedump(struct ltt_session
*session
)
966 unsigned char *uuid_c
= session
->uuid
;
968 struct ltt_channel
*chan
;
969 struct ltt_event
*event
;
972 if (!CMM_ACCESS_ONCE(session
->active
))
974 if (session
->metadata_dumped
)
976 if (!session
->metadata
) {
977 DBG("LTTng: attempt to start tracing, but metadata channel is not found. Operation abort.\n");
981 snprintf(uuid_s
, sizeof(uuid_s
),
982 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
983 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
984 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
985 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
986 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
988 ret
= lttng_metadata_printf(session
,
989 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
990 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
991 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
992 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
993 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
994 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
1000 " byte_order = %s;\n"
1001 " packet.header := struct {\n"
1002 " uint32_t magic;\n"
1003 " uint8_t uuid[16];\n"
1004 " uint32_t stream_id;\n"
1007 lttng_alignof(uint8_t) * CHAR_BIT
,
1008 lttng_alignof(uint16_t) * CHAR_BIT
,
1009 lttng_alignof(uint32_t) * CHAR_BIT
,
1010 lttng_alignof(uint64_t) * CHAR_BIT
,
1014 #if (BYTE_ORDER == BIG_ENDIAN)
1023 ret
= _ltt_stream_packet_context_declare(session
);
1027 ret
= _ltt_event_header_declare(session
);
1032 cds_list_for_each_entry(chan
, &session
->chan
, list
) {
1033 ret
= _ltt_channel_metadata_statedump(session
, chan
);
1038 cds_list_for_each_entry(event
, &session
->events
, list
) {
1039 ret
= _ltt_event_metadata_statedump(session
, event
->chan
, event
);
1043 session
->metadata_dumped
= 1;
1048 void lttng_ust_events_exit(void)
1050 struct ltt_session
*session
, *tmpsession
;
1052 cds_list_for_each_entry_safe(session
, tmpsession
, &sessions
, list
)
1053 ltt_session_destroy(session
);