2 * Copyright (C) 2010-2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * SPDX-License-Identifier: GPL-2.0-only
16 #include <common/common.hpp>
17 #include <common/time.hpp>
19 #include "ust-registry.hpp"
20 #include "ust-clock.hpp"
21 #include "ust-app.hpp"
23 #define NR_CLOCK_OFFSET_SAMPLES 10
25 struct offset_sample
{
26 int64_t offset
; /* correlation offset */
27 uint64_t measure_delta
; /* lower is better */
31 int _lttng_field_statedump(struct ust_registry_session
*session
,
32 const struct lttng_ust_ctl_field
*fields
, size_t nr_fields
,
33 size_t *iter_field
, size_t nesting
);
36 int get_count_order(unsigned int count
)
40 order
= lttng_fls(count
) - 1;
41 if (count
& (count
- 1)) {
44 LTTNG_ASSERT(order
>= 0);
49 * Returns offset where to write in metadata array, or negative error value on error.
52 ssize_t
metadata_reserve(struct ust_registry_session
*session
, size_t len
)
54 size_t new_len
= session
->metadata_len
+ len
;
55 size_t new_alloc_len
= new_len
;
56 size_t old_alloc_len
= session
->metadata_alloc_len
;
59 if (new_alloc_len
> (UINT32_MAX
>> 1))
61 if ((old_alloc_len
<< 1) > (UINT32_MAX
>> 1))
64 if (new_alloc_len
> old_alloc_len
) {
68 std::max
<size_t>(1U << get_count_order(new_alloc_len
), old_alloc_len
<< 1);
69 newptr
= (char *) realloc(session
->metadata
, new_alloc_len
);
72 session
->metadata
= newptr
;
73 /* We zero directly the memory from start of allocation. */
74 memset(&session
->metadata
[old_alloc_len
], 0, new_alloc_len
- old_alloc_len
);
75 session
->metadata_alloc_len
= new_alloc_len
;
77 ret
= session
->metadata_len
;
78 session
->metadata_len
+= len
;
83 int metadata_file_append(struct ust_registry_session
*session
,
84 const char *str
, size_t len
)
88 if (session
->metadata_fd
< 0) {
91 /* Write to metadata file */
92 written
= lttng_write(session
->metadata_fd
, str
, len
);
100 * We have exclusive access to our metadata buffer (protected by the
101 * ust_lock), so we can do racy operations such as looking for
102 * remaining space left in packet and write, since mutual exclusion
103 * protects us from concurrent writes.
105 static ATTR_FORMAT_PRINTF(2, 3)
106 int lttng_metadata_printf(struct ust_registry_session
*session
,
107 const char *fmt
, ...)
116 ret
= vasprintf(&str
, fmt
, ap
);
122 offset
= metadata_reserve(session
, len
);
127 memcpy(&session
->metadata
[offset
], str
, len
);
128 ret
= metadata_file_append(session
, str
, len
);
130 PERROR("Error appending to metadata file");
133 DBG3("Append to metadata: \"%s\"", str
);
142 int print_tabs(struct ust_registry_session
*session
, size_t nesting
)
146 for (i
= 0; i
< nesting
; i
++) {
149 ret
= lttng_metadata_printf(session
, " ");
158 void sanitize_ctf_identifier(char *out
, const char *in
)
162 for (i
= 0; i
< LTTNG_UST_ABI_SYM_NAME_LEN
; i
++) {
176 int print_escaped_ctf_string(struct ust_registry_session
*session
, const char *string
)
184 while (cur
!= '\0') {
187 ret
= lttng_metadata_printf(session
, "%s", "\\n");
191 ret
= lttng_metadata_printf(session
, "%c", '\\');
195 /* We still print the current char */
198 ret
= lttng_metadata_printf(session
, "%c", cur
);
212 /* Called with session registry mutex held. */
214 int ust_metadata_enum_statedump(struct ust_registry_session
*session
,
215 const char *enum_name
,
217 const struct lttng_ust_ctl_integer_type
*container_type
,
218 const char *field_name
, size_t *iter_field
, size_t nesting
)
220 struct ust_registry_enum
*reg_enum
;
221 const struct lttng_ust_ctl_enum_entry
*entries
;
225 char identifier
[LTTNG_UST_ABI_SYM_NAME_LEN
];
228 reg_enum
= ust_registry_lookup_enum_by_id(session
, enum_name
, enum_id
);
230 /* reg_enum can still be used because session registry mutex is held. */
235 entries
= reg_enum
->entries
;
236 nr_entries
= reg_enum
->nr_entries
;
238 ret
= print_tabs(session
, nesting
);
242 ret
= lttng_metadata_printf(session
,
243 "enum : integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u; } {\n",
244 container_type
->size
,
245 container_type
->alignment
,
246 container_type
->signedness
,
247 (container_type
->encoding
== lttng_ust_ctl_encode_none
)
249 : (container_type
->encoding
== lttng_ust_ctl_encode_UTF8
)
252 container_type
->base
);
257 /* Dump all entries */
258 for (i
= 0; i
< nr_entries
; i
++) {
259 const struct lttng_ust_ctl_enum_entry
*entry
= &entries
[i
];
262 ret
= print_tabs(session
, nesting
);
266 ret
= lttng_metadata_printf(session
,
271 len
= strlen(entry
->string
);
272 /* Escape the character '"' */
273 for (j
= 0; j
< len
; j
++) {
274 char c
= entry
->string
[j
];
278 ret
= lttng_metadata_printf(session
,
282 ret
= lttng_metadata_printf(session
,
286 ret
= lttng_metadata_printf(session
,
294 ret
= lttng_metadata_printf(session
, "\"");
299 if (entry
->u
.extra
.options
&
300 LTTNG_UST_CTL_UST_ENUM_ENTRY_OPTION_IS_AUTO
) {
301 ret
= lttng_metadata_printf(session
, ",\n");
306 ret
= lttng_metadata_printf(session
,
312 if (entry
->start
.signedness
) {
313 ret
= lttng_metadata_printf(session
,
314 "%" PRId64
, entry
->start
.value
);
316 ret
= lttng_metadata_printf(session
,
317 "%" PRIu64
, entry
->start
.value
);
323 if (entry
->start
.signedness
== entry
->end
.signedness
&&
324 entry
->start
.value
==
326 ret
= lttng_metadata_printf(session
, ",\n");
328 if (entry
->end
.signedness
) {
329 ret
= lttng_metadata_printf(session
,
330 " ... %" PRId64
",\n",
333 ret
= lttng_metadata_printf(session
,
334 " ... %" PRIu64
",\n",
344 sanitize_ctf_identifier(identifier
, field_name
);
345 ret
= print_tabs(session
, nesting
);
349 ret
= lttng_metadata_printf(session
, "} _%s;\n",
357 int _lttng_variant_statedump(struct ust_registry_session
*session
,
358 uint32_t nr_choices
, const char *tag_name
,
360 const struct lttng_ust_ctl_field
*fields
, size_t nr_fields
,
361 size_t *iter_field
, size_t nesting
)
363 const struct lttng_ust_ctl_field
*variant
= &fields
[*iter_field
];
366 char identifier
[LTTNG_UST_ABI_SYM_NAME_LEN
];
369 sanitize_ctf_identifier(identifier
, tag_name
);
371 ret
= print_tabs(session
, nesting
);
375 ret
= lttng_metadata_printf(session
,
376 "struct { } align(%u) _%s_padding;\n",
377 alignment
* CHAR_BIT
,
383 ret
= print_tabs(session
, nesting
);
387 ret
= lttng_metadata_printf(session
,
394 for (i
= 0; i
< nr_choices
; i
++) {
395 if (*iter_field
>= nr_fields
) {
399 ret
= _lttng_field_statedump(session
,
401 iter_field
, nesting
+ 1);
406 sanitize_ctf_identifier(identifier
, variant
->name
);
407 ret
= print_tabs(session
, nesting
);
411 ret
= lttng_metadata_printf(session
,
422 int _lttng_field_statedump(struct ust_registry_session
*session
,
423 const struct lttng_ust_ctl_field
*fields
, size_t nr_fields
,
424 size_t *iter_field
, size_t nesting
)
427 const char *bo_be
= " byte_order = be;";
428 const char *bo_le
= " byte_order = le;";
429 const char *bo_native
= "";
430 const char *bo_reverse
;
431 const struct lttng_ust_ctl_field
*field
;
433 if (*iter_field
>= nr_fields
) {
437 field
= &fields
[*iter_field
];
439 if (session
->byte_order
== BIG_ENDIAN
) {
445 switch (field
->type
.atype
) {
446 case lttng_ust_ctl_atype_integer
:
447 ret
= print_tabs(session
, nesting
);
451 ret
= lttng_metadata_printf(session
,
452 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n",
453 field
->type
.u
.integer
.size
,
454 field
->type
.u
.integer
.alignment
,
455 field
->type
.u
.integer
.signedness
,
456 (field
->type
.u
.integer
.encoding
== lttng_ust_ctl_encode_none
)
458 : (field
->type
.u
.integer
.encoding
== lttng_ust_ctl_encode_UTF8
)
461 field
->type
.u
.integer
.base
,
462 field
->type
.u
.integer
.reverse_byte_order
? bo_reverse
: bo_native
,
466 case lttng_ust_ctl_atype_enum
:
467 ret
= ust_metadata_enum_statedump(session
,
468 field
->type
.u
.legacy
.basic
.enumeration
.name
,
469 field
->type
.u
.legacy
.basic
.enumeration
.id
,
470 &field
->type
.u
.legacy
.basic
.enumeration
.container_type
,
471 field
->name
, iter_field
, nesting
);
473 case lttng_ust_ctl_atype_float
:
474 ret
= print_tabs(session
, nesting
);
478 ret
= lttng_metadata_printf(session
,
479 "floating_point { exp_dig = %u; mant_dig = %u; align = %u;%s } _%s;\n",
480 field
->type
.u
._float
.exp_dig
,
481 field
->type
.u
._float
.mant_dig
,
482 field
->type
.u
._float
.alignment
,
483 field
->type
.u
._float
.reverse_byte_order
? bo_reverse
: bo_native
,
487 case lttng_ust_ctl_atype_array
:
489 const struct lttng_ust_ctl_basic_type
*elem_type
;
491 ret
= print_tabs(session
, nesting
);
495 elem_type
= &field
->type
.u
.legacy
.array
.elem_type
;
496 /* Only integers are currently supported in arrays. */
497 if (elem_type
->atype
!= lttng_ust_ctl_atype_integer
) {
501 ret
= lttng_metadata_printf(session
,
502 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n",
503 elem_type
->u
.basic
.integer
.size
,
504 elem_type
->u
.basic
.integer
.alignment
,
505 elem_type
->u
.basic
.integer
.signedness
,
506 (elem_type
->u
.basic
.integer
.encoding
== lttng_ust_ctl_encode_none
)
508 : (elem_type
->u
.basic
.integer
.encoding
== lttng_ust_ctl_encode_UTF8
)
511 elem_type
->u
.basic
.integer
.base
,
512 elem_type
->u
.basic
.integer
.reverse_byte_order
? bo_reverse
: bo_native
,
513 field
->name
, field
->type
.u
.legacy
.array
.length
);
517 case lttng_ust_ctl_atype_array_nestable
:
519 uint32_t array_length
;
520 const struct lttng_ust_ctl_field
*array_nestable
;
521 const struct lttng_ust_ctl_type
*elem_type
;
523 array_length
= field
->type
.u
.array_nestable
.length
;
526 if (*iter_field
>= nr_fields
) {
530 array_nestable
= &fields
[*iter_field
];
531 elem_type
= &array_nestable
->type
;
533 /* Only integers are currently supported in arrays. */
534 if (elem_type
->atype
!= lttng_ust_ctl_atype_integer
) {
539 if (field
->type
.u
.array_nestable
.alignment
) {
540 ret
= print_tabs(session
, nesting
);
544 ret
= lttng_metadata_printf(session
,
545 "struct { } align(%u) _%s_padding;\n",
546 field
->type
.u
.array_nestable
.alignment
* CHAR_BIT
,
553 ret
= print_tabs(session
, nesting
);
557 ret
= lttng_metadata_printf(session
,
558 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n",
559 elem_type
->u
.integer
.size
,
560 elem_type
->u
.integer
.alignment
,
561 elem_type
->u
.integer
.signedness
,
562 (elem_type
->u
.integer
.encoding
== lttng_ust_ctl_encode_none
)
564 : (elem_type
->u
.integer
.encoding
== lttng_ust_ctl_encode_UTF8
)
567 elem_type
->u
.integer
.base
,
568 elem_type
->u
.integer
.reverse_byte_order
? bo_reverse
: bo_native
,
569 field
->name
, array_length
);
573 case lttng_ust_ctl_atype_sequence
:
575 const struct lttng_ust_ctl_basic_type
*elem_type
;
576 const struct lttng_ust_ctl_basic_type
*length_type
;
578 elem_type
= &field
->type
.u
.legacy
.sequence
.elem_type
;
579 length_type
= &field
->type
.u
.legacy
.sequence
.length_type
;
580 ret
= print_tabs(session
, nesting
);
585 /* Only integers are currently supported in sequences. */
586 if (elem_type
->atype
!= lttng_ust_ctl_atype_integer
) {
591 ret
= lttng_metadata_printf(session
,
592 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n",
593 length_type
->u
.basic
.integer
.size
,
594 (unsigned int) length_type
->u
.basic
.integer
.alignment
,
595 length_type
->u
.basic
.integer
.signedness
,
596 (length_type
->u
.basic
.integer
.encoding
== lttng_ust_ctl_encode_none
)
598 : ((length_type
->u
.basic
.integer
.encoding
== lttng_ust_ctl_encode_UTF8
)
601 length_type
->u
.basic
.integer
.base
,
602 length_type
->u
.basic
.integer
.reverse_byte_order
? bo_reverse
: bo_native
,
608 ret
= print_tabs(session
, nesting
);
612 ret
= lttng_metadata_printf(session
,
613 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n",
614 elem_type
->u
.basic
.integer
.size
,
615 (unsigned int) elem_type
->u
.basic
.integer
.alignment
,
616 elem_type
->u
.basic
.integer
.signedness
,
617 (elem_type
->u
.basic
.integer
.encoding
== lttng_ust_ctl_encode_none
)
619 : ((elem_type
->u
.basic
.integer
.encoding
== lttng_ust_ctl_encode_UTF8
)
622 elem_type
->u
.basic
.integer
.base
,
623 elem_type
->u
.basic
.integer
.reverse_byte_order
? bo_reverse
: bo_native
,
629 case lttng_ust_ctl_atype_sequence_nestable
:
631 const struct lttng_ust_ctl_field
*sequence_nestable
;
632 const struct lttng_ust_ctl_type
*elem_type
;
635 if (*iter_field
>= nr_fields
) {
639 sequence_nestable
= &fields
[*iter_field
];
640 elem_type
= &sequence_nestable
->type
;
642 /* Only integers are currently supported in sequences. */
643 if (elem_type
->atype
!= lttng_ust_ctl_atype_integer
) {
648 if (field
->type
.u
.sequence_nestable
.alignment
) {
649 ret
= print_tabs(session
, nesting
);
653 ret
= lttng_metadata_printf(session
,
654 "struct { } align(%u) _%s_padding;\n",
655 field
->type
.u
.sequence_nestable
.alignment
* CHAR_BIT
,
662 ret
= print_tabs(session
, nesting
);
666 ret
= lttng_metadata_printf(session
,
667 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ _%s ];\n",
668 elem_type
->u
.integer
.size
,
669 (unsigned int) elem_type
->u
.integer
.alignment
,
670 elem_type
->u
.integer
.signedness
,
671 (elem_type
->u
.integer
.encoding
== lttng_ust_ctl_encode_none
)
673 : ((elem_type
->u
.integer
.encoding
== lttng_ust_ctl_encode_UTF8
)
676 elem_type
->u
.integer
.base
,
677 elem_type
->u
.integer
.reverse_byte_order
? bo_reverse
: bo_native
,
679 field
->type
.u
.sequence_nestable
.length_name
);
683 case lttng_ust_ctl_atype_string
:
684 /* Default encoding is UTF8 */
685 ret
= print_tabs(session
, nesting
);
689 ret
= lttng_metadata_printf(session
,
691 field
->type
.u
.string
.encoding
== lttng_ust_ctl_encode_ASCII
?
692 " { encoding = ASCII; }" : "",
696 case lttng_ust_ctl_atype_variant
:
697 ret
= _lttng_variant_statedump(session
,
698 field
->type
.u
.legacy
.variant
.nr_choices
,
699 field
->type
.u
.legacy
.variant
.tag_name
,
701 fields
, nr_fields
, iter_field
, nesting
);
706 case lttng_ust_ctl_atype_variant_nestable
:
707 ret
= _lttng_variant_statedump(session
,
708 field
->type
.u
.variant_nestable
.nr_choices
,
709 field
->type
.u
.variant_nestable
.tag_name
,
710 field
->type
.u
.variant_nestable
.alignment
,
711 fields
, nr_fields
, iter_field
, nesting
);
716 case lttng_ust_ctl_atype_struct
:
717 if (field
->type
.u
.legacy
._struct
.nr_fields
!= 0) {
718 /* Currently only 0-length structures are supported. */
722 ret
= print_tabs(session
, nesting
);
726 ret
= lttng_metadata_printf(session
,
731 case lttng_ust_ctl_atype_struct_nestable
:
732 if (field
->type
.u
.struct_nestable
.nr_fields
!= 0) {
733 /* Currently only 0-length structures are supported. */
737 ret
= print_tabs(session
, nesting
);
741 if (field
->type
.u
.struct_nestable
.alignment
) {
742 ret
= lttng_metadata_printf(session
,
743 "struct {} align(%u) _%s;\n",
744 field
->type
.u
.struct_nestable
.alignment
* CHAR_BIT
,
750 ret
= lttng_metadata_printf(session
,
756 case lttng_ust_ctl_atype_enum_nestable
:
758 const struct lttng_ust_ctl_field
*container_field
;
759 const struct lttng_ust_ctl_type
*container_type
;
762 if (*iter_field
>= nr_fields
) {
766 container_field
= &fields
[*iter_field
];
767 container_type
= &container_field
->type
;
769 /* Only integers are supported as container types. */
770 if (container_type
->atype
!= lttng_ust_ctl_atype_integer
) {
774 ret
= ust_metadata_enum_statedump(session
,
775 field
->type
.u
.enum_nestable
.name
,
776 field
->type
.u
.enum_nestable
.id
,
777 &container_type
->u
.integer
,
778 field
->name
, iter_field
, nesting
);
789 int _lttng_context_metadata_statedump(struct ust_registry_session
*session
,
790 size_t nr_ctx_fields
,
791 struct lttng_ust_ctl_field
*ctx
)
799 if (i
>= nr_ctx_fields
) {
802 ret
= _lttng_field_statedump(session
, ctx
,
803 nr_ctx_fields
, &i
, 2);
812 int _lttng_fields_metadata_statedump(struct ust_registry_session
*session
,
813 struct ust_registry_event
*event
)
819 if (i
>= event
->nr_fields
) {
822 ret
= _lttng_field_statedump(session
, event
->fields
,
823 event
->nr_fields
, &i
, 2);
832 * Should be called with session registry mutex held.
834 int ust_metadata_event_statedump(struct ust_registry_session
*session
,
835 struct ust_registry_channel
*chan
,
836 struct ust_registry_event
*event
)
840 /* Don't dump metadata events */
841 if (chan
->chan_id
== -1U)
844 ret
= lttng_metadata_printf(session
,
848 " stream_id = %u;\n",
856 ret
= lttng_metadata_printf(session
,
858 event
->loglevel_value
);
863 if (event
->model_emf_uri
) {
864 ret
= lttng_metadata_printf(session
,
865 " model.emf.uri = \"%s\";\n",
866 event
->model_emf_uri
);
872 ret
= lttng_metadata_printf(session
,
873 " fields := struct {\n"
879 ret
= _lttng_fields_metadata_statedump(session
, event
);
884 ret
= lttng_metadata_printf(session
,
890 event
->metadata_dumped
= 1;
897 * Should be called with session registry mutex held.
899 int ust_metadata_channel_statedump(struct ust_registry_session
*session
,
900 struct ust_registry_channel
*chan
)
904 /* Don't dump metadata events */
905 if (chan
->chan_id
== -1U)
908 if (!chan
->header_type
)
911 ret
= lttng_metadata_printf(session
,
914 " event.header := %s;\n"
915 " packet.context := struct packet_context;\n",
917 chan
->header_type
== LTTNG_UST_CTL_CHANNEL_HEADER_COMPACT
?
918 "struct event_header_compact" :
919 "struct event_header_large");
924 if (chan
->ctx_fields
) {
925 ret
= lttng_metadata_printf(session
,
926 " event.context := struct {\n");
931 ret
= _lttng_context_metadata_statedump(session
,
937 if (chan
->ctx_fields
) {
938 ret
= lttng_metadata_printf(session
,
945 ret
= lttng_metadata_printf(session
,
951 /* Flag success of metadata dump. */
952 chan
->metadata_dumped
= 1;
958 int _lttng_stream_packet_context_declare(struct ust_registry_session
*session
)
960 return lttng_metadata_printf(session
,
961 "struct packet_context {\n"
962 " uint64_clock_monotonic_t timestamp_begin;\n"
963 " uint64_clock_monotonic_t timestamp_end;\n"
964 " uint64_t content_size;\n"
965 " uint64_t packet_size;\n"
966 " uint64_t packet_seq_num;\n"
967 " unsigned long events_discarded;\n"
968 " uint32_t cpu_id;\n"
976 * id 31 is reserved to indicate an extended header.
979 * id: range: 0 - 65534.
980 * id 65535 is reserved to indicate an extended header.
983 int _lttng_event_header_declare(struct ust_registry_session
*session
)
985 return lttng_metadata_printf(session
,
986 "struct event_header_compact {\n"
987 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
990 " uint27_clock_monotonic_t timestamp;\n"
994 " uint64_clock_monotonic_t timestamp;\n"
999 "struct event_header_large {\n"
1000 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
1003 " uint32_clock_monotonic_t timestamp;\n"
1007 " uint64_clock_monotonic_t timestamp;\n"
1011 session
->uint32_t_alignment
,
1012 session
->uint16_t_alignment
1017 * The offset between monotonic and realtime clock can be negative if
1018 * the system sets the REALTIME clock to 0 after boot.
1021 int measure_single_clock_offset(struct offset_sample
*sample
)
1023 uint64_t monotonic_avg
, monotonic
[2], measure_delta
, realtime
;
1024 uint64_t tcf
= trace_clock_freq();
1025 struct timespec rts
= { 0, 0 };
1028 monotonic
[0] = trace_clock_read64();
1029 ret
= lttng_clock_gettime(CLOCK_REALTIME
, &rts
);
1033 monotonic
[1] = trace_clock_read64();
1034 measure_delta
= monotonic
[1] - monotonic
[0];
1035 if (measure_delta
> sample
->measure_delta
) {
1037 * Discard value if it took longer to read than the best
1042 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
1043 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
1044 if (tcf
== NSEC_PER_SEC
) {
1045 realtime
+= rts
.tv_nsec
;
1047 realtime
+= (uint64_t) rts
.tv_nsec
* tcf
/ NSEC_PER_SEC
;
1049 sample
->offset
= (int64_t) realtime
- monotonic_avg
;
1050 sample
->measure_delta
= measure_delta
;
1055 * Approximation of NTP time of day to clock monotonic correlation,
1056 * taken at start of trace. Keep the measurement that took the less time
1057 * to complete, thus removing imprecision caused by preemption.
1058 * May return a negative offset.
1061 int64_t measure_clock_offset(void)
1064 struct offset_sample offset_best_sample
= {
1066 .measure_delta
= UINT64_MAX
,
1069 for (i
= 0; i
< NR_CLOCK_OFFSET_SAMPLES
; i
++) {
1070 if (measure_single_clock_offset(&offset_best_sample
)) {
1074 return offset_best_sample
.offset
;
1078 int print_metadata_session_information(struct ust_registry_session
*registry
)
1081 struct ltt_session
*session
= NULL
;
1082 char creation_datetime
[ISO8601_STR_LEN
];
1085 session
= session_find_by_id(registry
->tracing_id
);
1091 /* Print the trace name */
1092 ret
= lttng_metadata_printf(registry
, " trace_name = \"");
1098 * This is necessary since the creation time is present in the session
1099 * name when it is generated.
1101 if (session
->has_auto_generated_name
) {
1102 ret
= print_escaped_ctf_string(registry
, DEFAULT_SESSION_NAME
);
1104 ret
= print_escaped_ctf_string(registry
, session
->name
);
1110 ret
= lttng_metadata_printf(registry
, "\";\n");
1115 /* Prepare creation time */
1116 ret
= time_to_iso8601_str(session
->creation_time
, creation_datetime
,
1117 sizeof(creation_datetime
));
1122 /* Output the reste of the information */
1123 ret
= lttng_metadata_printf(registry
,
1124 " trace_creation_datetime = \"%s\";\n"
1125 " hostname = \"%s\";\n",
1126 creation_datetime
, session
->hostname
);
1133 session_put(session
);
1140 int print_metadata_app_information(struct ust_registry_session
*registry
,
1141 struct ust_app
*app
)
1144 char datetime
[ISO8601_STR_LEN
];
1151 ret
= time_to_iso8601_str(
1152 app
->registration_time
, datetime
, sizeof(datetime
));
1157 ret
= lttng_metadata_printf(registry
,
1158 " tracer_patchlevel = %u;\n"
1160 " procname = \"%s\";\n"
1161 " vpid_datetime = \"%s\";\n",
1162 app
->version
.patchlevel
, (int) app
->pid
, app
->name
,
1170 * Should be called with session registry mutex held.
1172 int ust_metadata_session_statedump(struct ust_registry_session
*session
,
1173 struct ust_app
*app
,
1177 char uuid_s
[LTTNG_UUID_STR_LEN
],
1178 clock_uuid_s
[LTTNG_UUID_STR_LEN
];
1181 LTTNG_ASSERT(session
);
1183 lttng_uuid_to_str(session
->uuid
, uuid_s
);
1186 ret
= lttng_metadata_printf(session
,
1187 "/* CTF %u.%u */\n\n",
1194 ret
= lttng_metadata_printf(session
,
1195 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
1196 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
1197 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
1198 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
1199 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
1200 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
1201 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
1207 " byte_order = %s;\n"
1208 " packet.header := struct {\n"
1209 " uint32_t magic;\n"
1210 " uint8_t uuid[16];\n"
1211 " uint32_t stream_id;\n"
1212 " uint64_t stream_instance_id;\n"
1215 session
->uint8_t_alignment
,
1216 session
->uint16_t_alignment
,
1217 session
->uint32_t_alignment
,
1218 session
->uint64_t_alignment
,
1219 session
->bits_per_long
,
1220 session
->long_alignment
,
1224 session
->byte_order
== BIG_ENDIAN
? "be" : "le"
1230 ret
= lttng_metadata_printf(session
,
1232 " domain = \"ust\";\n"
1233 " tracer_name = \"lttng-ust\";\n"
1234 " tracer_major = %u;\n"
1235 " tracer_minor = %u;\n"
1236 " tracer_buffering_scheme = \"%s\";\n"
1237 " tracer_buffering_id = %u;\n"
1238 " architecture_bit_width = %u;\n",
1241 app
? "pid" : "uid",
1242 app
? (int) app
->pid
: (int) session
->tracing_uid
,
1243 session
->bits_per_long
);
1248 ret
= print_metadata_session_information(session
);
1254 * If per-application registry, we can output extra information
1255 * about the application.
1257 ret
= print_metadata_app_information(session
, app
);
1262 ret
= lttng_metadata_printf(session
,
1269 ret
= lttng_metadata_printf(session
,
1271 " name = \"%s\";\n",
1278 if (!trace_clock_uuid(clock_uuid_s
)) {
1279 ret
= lttng_metadata_printf(session
,
1280 " uuid = \"%s\";\n",
1288 ret
= lttng_metadata_printf(session
,
1289 " description = \"%s\";\n"
1290 " freq = %" PRIu64
"; /* Frequency, in Hz */\n"
1291 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
1292 " offset = %" PRId64
";\n"
1294 trace_clock_description(),
1296 measure_clock_offset()
1302 ret
= lttng_metadata_printf(session
,
1303 "typealias integer {\n"
1304 " size = 27; align = 1; signed = false;\n"
1305 " map = clock.%s.value;\n"
1306 "} := uint27_clock_monotonic_t;\n"
1308 "typealias integer {\n"
1309 " size = 32; align = %u; signed = false;\n"
1310 " map = clock.%s.value;\n"
1311 "} := uint32_clock_monotonic_t;\n"
1313 "typealias integer {\n"
1314 " size = 64; align = %u; signed = false;\n"
1315 " map = clock.%s.value;\n"
1316 "} := uint64_clock_monotonic_t;\n\n",
1318 session
->uint32_t_alignment
,
1320 session
->uint64_t_alignment
,
1327 ret
= _lttng_stream_packet_context_declare(session
);
1332 ret
= _lttng_event_header_declare(session
);