2 * Copyright 2010-2011 EfficiOS Inc. and Linux Foundation
3 * Copyright 2017 Philippe Proulx <pproulx@efficios.com>
5 * Permission is hereby granted, free of charge, to any person obtaining a copy
6 * of this software and associated documentation files (the "Software"), to deal
7 * in the Software without restriction, including without limitation the rights
8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 * copies of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
24 #define BT_LOG_TAG "PLUGIN-TEXT-DMESG-SRC"
31 #include <babeltrace/assert-internal.h>
32 #include <babeltrace/common-internal.h>
33 #include <babeltrace/babeltrace.h>
34 #include <babeltrace/value-internal.h>
35 #include <babeltrace/compat/utc-internal.h>
36 #include <babeltrace/compat/stdio-internal.h>
39 #define NSEC_PER_USEC 1000UL
40 #define NSEC_PER_MSEC 1000000UL
41 #define NSEC_PER_SEC 1000000000ULL
42 #define USEC_PER_SEC 1000000UL
44 struct dmesg_component
;
46 struct dmesg_msg_iter
{
47 struct dmesg_component
*dmesg_comp
;
48 bt_self_message_iterator
*pc_msg_iter
; /* Weak */
52 bt_message
*tmp_event_msg
;
53 uint64_t last_clock_value
;
56 STATE_EMIT_STREAM_BEGINNING
,
57 STATE_EMIT_STREAM_ACTIVITY_BEGINNING
,
58 STATE_EMIT_PACKET_BEGINNING
,
60 STATE_EMIT_PACKET_END
,
61 STATE_EMIT_STREAM_ACTIVITY_END
,
62 STATE_EMIT_STREAM_END
,
67 struct dmesg_component
{
70 bt_bool read_from_stdin
;
74 bt_self_component_source
*self_comp
;
75 bt_trace_class
*trace_class
;
76 bt_stream_class
*stream_class
;
77 bt_event_class
*event_class
;
81 bt_clock_class
*clock_class
;
85 bt_field_class
*create_event_payload_fc(bt_trace_class
*trace_class
)
87 bt_field_class
*root_fc
= NULL
;
88 bt_field_class
*fc
= NULL
;
91 root_fc
= bt_field_class_structure_create(trace_class
);
93 BT_LOGE_STR("Cannot create an empty structure field class object.");
97 fc
= bt_field_class_string_create(trace_class
);
99 BT_LOGE_STR("Cannot create a string field class object.");
103 ret
= bt_field_class_structure_append_member(root_fc
,
106 BT_LOGE("Cannot add `str` member to structure field class: "
114 BT_FIELD_CLASS_PUT_REF_AND_RESET(root_fc
);
117 bt_field_class_put_ref(fc
);
122 int create_meta(struct dmesg_component
*dmesg_comp
, bool has_ts
)
124 bt_field_class
*fc
= NULL
;
127 dmesg_comp
->trace_class
= bt_trace_class_create(
128 bt_self_component_source_as_self_component(
129 dmesg_comp
->self_comp
));
130 if (!dmesg_comp
->trace_class
) {
131 BT_LOGE_STR("Cannot create an empty trace class object.");
135 dmesg_comp
->stream_class
= bt_stream_class_create(
136 dmesg_comp
->trace_class
);
137 if (!dmesg_comp
->stream_class
) {
138 BT_LOGE_STR("Cannot create a stream class object.");
143 dmesg_comp
->clock_class
= bt_clock_class_create(
144 bt_self_component_source_as_self_component(
145 dmesg_comp
->self_comp
));
146 if (!dmesg_comp
->clock_class
) {
147 BT_LOGE_STR("Cannot create clock class.");
152 * The `dmesg` timestamp's origin is not the Unix epoch,
153 * it's the boot time.
155 bt_clock_class_set_origin_is_unix_epoch(dmesg_comp
->clock_class
,
158 ret
= bt_stream_class_set_default_clock_class(
159 dmesg_comp
->stream_class
, dmesg_comp
->clock_class
);
161 BT_LOGE_STR("Cannot set stream class's default clock class.");
166 dmesg_comp
->event_class
= bt_event_class_create(
167 dmesg_comp
->stream_class
);
168 if (!dmesg_comp
->event_class
) {
169 BT_LOGE_STR("Cannot create an event class object.");
173 ret
= bt_event_class_set_name(dmesg_comp
->event_class
, "string");
175 BT_LOGE_STR("Cannot set event class's name.");
179 fc
= create_event_payload_fc(dmesg_comp
->trace_class
);
181 BT_LOGE_STR("Cannot create event payload field class.");
185 ret
= bt_event_class_set_payload_field_class(dmesg_comp
->event_class
, fc
);
187 BT_LOGE_STR("Cannot set event class's event payload field class.");
197 bt_field_class_put_ref(fc
);
202 int handle_params(struct dmesg_component
*dmesg_comp
,
203 const bt_value
*params
)
205 const bt_value
*no_timestamp
= NULL
;
206 const bt_value
*path
= NULL
;
207 const char *path_str
;
210 no_timestamp
= bt_value_map_borrow_entry_value_const(params
,
211 "no-extract-timestamp");
213 if (!bt_value_is_bool(no_timestamp
)) {
214 BT_LOGE("Expecting a boolean value for the `no-extract-timestamp` parameter: "
216 bt_common_value_type_string(
217 bt_value_get_type(no_timestamp
)));
221 dmesg_comp
->params
.no_timestamp
=
222 bt_value_bool_get(no_timestamp
);
225 path
= bt_value_map_borrow_entry_value_const(params
, "path");
227 if (dmesg_comp
->params
.read_from_stdin
) {
228 BT_LOGE_STR("Cannot specify both `read-from-stdin` and `path` parameters.");
232 if (!bt_value_is_string(path
)) {
233 BT_LOGE("Expecting a string value for the `path` parameter: "
235 bt_common_value_type_string(
236 bt_value_get_type(path
)));
240 path_str
= bt_value_string_get(path
);
241 g_string_assign(dmesg_comp
->params
.path
, path_str
);
243 dmesg_comp
->params
.read_from_stdin
= true;
256 int create_packet_and_stream_and_trace(struct dmesg_component
*dmesg_comp
)
259 const char *trace_name
= NULL
;
260 gchar
*basename
= NULL
;
262 dmesg_comp
->trace
= bt_trace_create(dmesg_comp
->trace_class
);
263 if (!dmesg_comp
->trace
) {
264 BT_LOGE_STR("Cannot create trace object.");
268 if (dmesg_comp
->params
.read_from_stdin
) {
269 trace_name
= "STDIN";
271 basename
= g_path_get_basename(dmesg_comp
->params
.path
->str
);
274 if (strcmp(basename
, G_DIR_SEPARATOR_S
) != 0 &&
275 strcmp(basename
, ".") != 0) {
276 trace_name
= basename
;
281 ret
= bt_trace_set_name(dmesg_comp
->trace
, trace_name
);
283 BT_LOGE("Cannot set trace's name: name=\"%s\"",
289 dmesg_comp
->stream
= bt_stream_create(dmesg_comp
->stream_class
,
291 if (!dmesg_comp
->stream
) {
292 BT_LOGE_STR("Cannot create stream object.");
296 dmesg_comp
->packet
= bt_packet_create(dmesg_comp
->stream
);
297 if (!dmesg_comp
->packet
) {
298 BT_LOGE_STR("Cannot create packet object.");
302 ret
= bt_trace_make_static(dmesg_comp
->trace
);
304 BT_LOGE_STR("Cannot make trace static.");
322 int try_create_meta_stream_packet(struct dmesg_component
*dmesg_comp
,
327 if (dmesg_comp
->trace
) {
328 /* Already created */
332 ret
= create_meta(dmesg_comp
, has_ts
);
334 BT_LOGE("Cannot create metadata objects: dmesg-comp-addr=%p",
339 ret
= create_packet_and_stream_and_trace(dmesg_comp
);
341 BT_LOGE("Cannot create packet and stream objects: "
342 "dmesg-comp-addr=%p", dmesg_comp
);
356 void destroy_dmesg_component(struct dmesg_component
*dmesg_comp
)
362 if (dmesg_comp
->params
.path
) {
363 g_string_free(dmesg_comp
->params
.path
, TRUE
);
366 bt_packet_put_ref(dmesg_comp
->packet
);
367 bt_trace_put_ref(dmesg_comp
->trace
);
368 bt_stream_class_put_ref(dmesg_comp
->stream_class
);
369 bt_event_class_put_ref(dmesg_comp
->event_class
);
370 bt_stream_put_ref(dmesg_comp
->stream
);
371 bt_clock_class_put_ref(dmesg_comp
->clock_class
);
372 bt_trace_class_put_ref(dmesg_comp
->trace_class
);
377 bt_self_component_status
create_port(
378 bt_self_component_source
*self_comp
)
380 return bt_self_component_source_add_output_port(self_comp
,
385 bt_self_component_status
dmesg_init(
386 bt_self_component_source
*self_comp
,
387 bt_value
*params
, void *init_method_data
)
390 struct dmesg_component
*dmesg_comp
= g_new0(struct dmesg_component
, 1);
391 bt_self_component_status status
= BT_SELF_COMPONENT_STATUS_OK
;
394 BT_LOGE_STR("Failed to allocate one dmesg component structure.");
398 dmesg_comp
->self_comp
= self_comp
;
399 dmesg_comp
->params
.path
= g_string_new(NULL
);
400 if (!dmesg_comp
->params
.path
) {
401 BT_LOGE_STR("Failed to allocate a GString.");
405 ret
= handle_params(dmesg_comp
, params
);
407 BT_LOGE("Invalid parameters: comp-addr=%p", self_comp
);
411 if (!dmesg_comp
->params
.read_from_stdin
&&
412 !g_file_test(dmesg_comp
->params
.path
->str
,
413 G_FILE_TEST_IS_REGULAR
)) {
414 BT_LOGE("Input path is not a regular file: "
415 "comp-addr=%p, path=\"%s\"", self_comp
,
416 dmesg_comp
->params
.path
->str
);
420 status
= create_port(self_comp
);
421 if (status
!= BT_SELF_COMPONENT_STATUS_OK
) {
425 bt_self_component_set_data(
426 bt_self_component_source_as_self_component(self_comp
),
431 destroy_dmesg_component(dmesg_comp
);
432 bt_self_component_set_data(
433 bt_self_component_source_as_self_component(self_comp
),
437 status
= BT_SELF_COMPONENT_STATUS_ERROR
;
445 void dmesg_finalize(bt_self_component_source
*self_comp
)
447 destroy_dmesg_component(bt_self_component_get_data(
448 bt_self_component_source_as_self_component(self_comp
)));
452 bt_message
*create_init_event_msg_from_line(
453 struct dmesg_msg_iter
*msg_iter
,
454 const char *line
, const char **new_start
)
457 bt_message
*msg
= NULL
;
458 bool has_timestamp
= false;
459 unsigned long sec
, usec
, msec
;
460 unsigned int year
, mon
, mday
, hour
, min
;
463 struct dmesg_component
*dmesg_comp
= msg_iter
->dmesg_comp
;
467 if (dmesg_comp
->params
.no_timestamp
) {
471 /* Extract time from input line */
472 if (sscanf(line
, "[%lu.%lu] ", &sec
, &usec
) == 2) {
473 ts
= (uint64_t) sec
* USEC_PER_SEC
+ (uint64_t) usec
;
476 * The clock class we use has a 1 GHz frequency: convert
480 has_timestamp
= true;
481 } else if (sscanf(line
, "[%u-%u-%u %u:%u:%lu.%lu] ",
482 &year
, &mon
, &mday
, &hour
, &min
,
487 memset(&ti
, 0, sizeof(ti
));
488 ti
.tm_year
= year
- 1900; /* From 1900 */
489 ti
.tm_mon
= mon
- 1; /* 0 to 11 */
495 ep_sec
= bt_timegm(&ti
);
496 if (ep_sec
!= (time_t) -1) {
497 ts
= (uint64_t) ep_sec
* NSEC_PER_SEC
498 + (uint64_t) msec
* NSEC_PER_MSEC
;
501 has_timestamp
= true;
505 /* Set new start for the message portion of the line */
506 *new_start
= strchr(line
, ']');
507 BT_ASSERT(*new_start
);
510 if ((*new_start
)[0] == ' ') {
517 * At this point, we know if the stream class's event header
518 * field class should have a timestamp or not, so we can lazily
519 * create the metadata, stream, and packet objects.
521 ret
= try_create_meta_stream_packet(dmesg_comp
, has_timestamp
);
523 /* try_create_meta_stream_packet() logs errors */
527 if (dmesg_comp
->clock_class
) {
528 msg
= bt_message_event_create_with_default_clock_snapshot(
529 msg_iter
->pc_msg_iter
,
530 dmesg_comp
->event_class
, dmesg_comp
->packet
, ts
);
531 msg_iter
->last_clock_value
= ts
;
533 msg
= bt_message_event_create(msg_iter
->pc_msg_iter
,
534 dmesg_comp
->event_class
, dmesg_comp
->packet
);
538 BT_LOGE_STR("Cannot create event message.");
542 event
= bt_message_event_borrow_event(msg
);
547 BT_MESSAGE_PUT_REF_AND_RESET(msg
);
554 int fill_event_payload_from_line(const char *line
,
557 bt_field
*ep_field
= NULL
;
558 bt_field
*str_field
= NULL
;
562 ep_field
= bt_event_borrow_payload_field(event
);
564 str_field
= bt_field_structure_borrow_member_field_by_index(
567 BT_LOGE_STR("Cannot borrow `timestamp` field from event payload structure field.");
572 if (line
[len
- 1] == '\n') {
573 /* Do not include the newline character in the payload */
577 ret
= bt_field_string_clear(str_field
);
579 BT_LOGE_STR("Cannot clear string field object.");
583 ret
= bt_field_string_append_with_length(str_field
, line
, len
);
585 BT_LOGE("Cannot append value to string field object: "
600 bt_message
*create_msg_from_line(
601 struct dmesg_msg_iter
*dmesg_msg_iter
, const char *line
)
603 bt_event
*event
= NULL
;
604 bt_message
*msg
= NULL
;
605 const char *new_start
;
608 msg
= create_init_event_msg_from_line(dmesg_msg_iter
,
611 BT_LOGE_STR("Cannot create and initialize event message from line.");
615 event
= bt_message_event_borrow_event(msg
);
617 ret
= fill_event_payload_from_line(new_start
, event
);
619 BT_LOGE("Cannot fill event payload field from line: "
627 BT_MESSAGE_PUT_REF_AND_RESET(msg
);
634 void destroy_dmesg_msg_iter(struct dmesg_msg_iter
*dmesg_msg_iter
)
636 if (!dmesg_msg_iter
) {
640 if (dmesg_msg_iter
->fp
&& dmesg_msg_iter
->fp
!= stdin
) {
641 if (fclose(dmesg_msg_iter
->fp
)) {
642 BT_LOGE_ERRNO("Cannot close input file", ".");
646 bt_message_put_ref(dmesg_msg_iter
->tmp_event_msg
);
647 free(dmesg_msg_iter
->linebuf
);
648 g_free(dmesg_msg_iter
);
654 bt_self_message_iterator_status
dmesg_msg_iter_init(
655 bt_self_message_iterator
*self_msg_iter
,
656 bt_self_component_source
*self_comp
,
657 bt_self_component_port_output
*self_port
)
659 struct dmesg_component
*dmesg_comp
;
660 struct dmesg_msg_iter
*dmesg_msg_iter
=
661 g_new0(struct dmesg_msg_iter
, 1);
662 bt_self_message_iterator_status status
=
663 BT_SELF_MESSAGE_ITERATOR_STATUS_OK
;
665 if (!dmesg_msg_iter
) {
666 BT_LOGE_STR("Failed to allocate on dmesg message iterator structure.");
670 dmesg_comp
= bt_self_component_get_data(
671 bt_self_component_source_as_self_component(self_comp
));
672 BT_ASSERT(dmesg_comp
);
673 dmesg_msg_iter
->dmesg_comp
= dmesg_comp
;
674 dmesg_msg_iter
->pc_msg_iter
= self_msg_iter
;
676 if (dmesg_comp
->params
.read_from_stdin
) {
677 dmesg_msg_iter
->fp
= stdin
;
679 dmesg_msg_iter
->fp
= fopen(dmesg_comp
->params
.path
->str
, "r");
680 if (!dmesg_msg_iter
->fp
) {
681 BT_LOGE_ERRNO("Cannot open input file in read mode", ": path=\"%s\"",
682 dmesg_comp
->params
.path
->str
);
687 bt_self_message_iterator_set_data(self_msg_iter
,
692 destroy_dmesg_msg_iter(dmesg_msg_iter
);
693 bt_self_message_iterator_set_data(self_msg_iter
, NULL
);
695 status
= BT_SELF_MESSAGE_ITERATOR_STATUS_ERROR
;
703 void dmesg_msg_iter_finalize(
704 bt_self_message_iterator
*priv_msg_iter
)
706 destroy_dmesg_msg_iter(bt_self_message_iterator_get_data(
711 bt_self_message_iterator_status
dmesg_msg_iter_next_one(
712 struct dmesg_msg_iter
*dmesg_msg_iter
,
716 struct dmesg_component
*dmesg_comp
;
717 bt_self_message_iterator_status status
=
718 BT_SELF_MESSAGE_ITERATOR_STATUS_OK
;
720 BT_ASSERT(dmesg_msg_iter
);
721 dmesg_comp
= dmesg_msg_iter
->dmesg_comp
;
722 BT_ASSERT(dmesg_comp
);
724 if (dmesg_msg_iter
->state
== STATE_DONE
) {
725 status
= BT_SELF_MESSAGE_ITERATOR_STATUS_END
;
729 if (dmesg_msg_iter
->tmp_event_msg
||
730 dmesg_msg_iter
->state
== STATE_EMIT_PACKET_END
||
731 dmesg_msg_iter
->state
== STATE_EMIT_STREAM_ACTIVITY_END
||
732 dmesg_msg_iter
->state
== STATE_EMIT_STREAM_END
) {
738 bool only_spaces
= true;
740 len
= bt_getline(&dmesg_msg_iter
->linebuf
,
741 &dmesg_msg_iter
->linebuf_len
, dmesg_msg_iter
->fp
);
743 if (errno
== EINVAL
) {
744 status
= BT_SELF_MESSAGE_ITERATOR_STATUS_ERROR
;
745 } else if (errno
== ENOMEM
) {
747 BT_SELF_MESSAGE_ITERATOR_STATUS_NOMEM
;
749 if (dmesg_msg_iter
->state
== STATE_EMIT_STREAM_BEGINNING
) {
750 /* Stream did not even begin */
751 status
= BT_SELF_MESSAGE_ITERATOR_STATUS_END
;
754 /* End current packet now */
755 dmesg_msg_iter
->state
=
756 STATE_EMIT_PACKET_END
;
764 BT_ASSERT(dmesg_msg_iter
->linebuf
);
766 /* Ignore empty lines, once trimmed */
767 for (ch
= dmesg_msg_iter
->linebuf
; *ch
!= '\0'; ch
++) {
779 dmesg_msg_iter
->tmp_event_msg
= create_msg_from_line(
780 dmesg_msg_iter
, dmesg_msg_iter
->linebuf
);
781 if (!dmesg_msg_iter
->tmp_event_msg
) {
782 BT_LOGE("Cannot create event message from line: "
783 "dmesg-comp-addr=%p, line=\"%s\"", dmesg_comp
,
784 dmesg_msg_iter
->linebuf
);
789 BT_ASSERT(dmesg_comp
->trace
);
791 switch (dmesg_msg_iter
->state
) {
792 case STATE_EMIT_STREAM_BEGINNING
:
793 BT_ASSERT(dmesg_msg_iter
->tmp_event_msg
);
794 *msg
= bt_message_stream_beginning_create(
795 dmesg_msg_iter
->pc_msg_iter
, dmesg_comp
->stream
);
796 dmesg_msg_iter
->state
= STATE_EMIT_STREAM_ACTIVITY_BEGINNING
;
798 case STATE_EMIT_STREAM_ACTIVITY_BEGINNING
:
799 BT_ASSERT(dmesg_msg_iter
->tmp_event_msg
);
800 *msg
= bt_message_stream_activity_beginning_create(
801 dmesg_msg_iter
->pc_msg_iter
, dmesg_comp
->stream
);
802 dmesg_msg_iter
->state
= STATE_EMIT_PACKET_BEGINNING
;
804 case STATE_EMIT_PACKET_BEGINNING
:
805 BT_ASSERT(dmesg_msg_iter
->tmp_event_msg
);
807 if (dmesg_comp
->clock_class
) {
808 *msg
= bt_message_packet_beginning_create_with_default_clock_snapshot(
809 dmesg_msg_iter
->pc_msg_iter
, dmesg_comp
->packet
,
810 dmesg_msg_iter
->last_clock_value
);
812 *msg
= bt_message_packet_beginning_create(
813 dmesg_msg_iter
->pc_msg_iter
, dmesg_comp
->packet
);
816 dmesg_msg_iter
->state
= STATE_EMIT_EVENT
;
818 case STATE_EMIT_EVENT
:
819 BT_ASSERT(dmesg_msg_iter
->tmp_event_msg
);
820 *msg
= dmesg_msg_iter
->tmp_event_msg
;
821 dmesg_msg_iter
->tmp_event_msg
= NULL
;
823 case STATE_EMIT_PACKET_END
:
824 if (dmesg_comp
->clock_class
) {
825 *msg
= bt_message_packet_end_create_with_default_clock_snapshot(
826 dmesg_msg_iter
->pc_msg_iter
, dmesg_comp
->packet
,
827 dmesg_msg_iter
->last_clock_value
);
829 *msg
= bt_message_packet_end_create(
830 dmesg_msg_iter
->pc_msg_iter
, dmesg_comp
->packet
);
833 dmesg_msg_iter
->state
= STATE_EMIT_STREAM_ACTIVITY_END
;
835 case STATE_EMIT_STREAM_ACTIVITY_END
:
836 *msg
= bt_message_stream_activity_end_create(
837 dmesg_msg_iter
->pc_msg_iter
, dmesg_comp
->stream
);
838 dmesg_msg_iter
->state
= STATE_EMIT_STREAM_END
;
840 case STATE_EMIT_STREAM_END
:
841 *msg
= bt_message_stream_end_create(
842 dmesg_msg_iter
->pc_msg_iter
, dmesg_comp
->stream
);
843 dmesg_msg_iter
->state
= STATE_DONE
;
850 BT_LOGE("Cannot create message: dmesg-comp-addr=%p",
852 status
= BT_SELF_MESSAGE_ITERATOR_STATUS_ERROR
;
860 bt_self_message_iterator_status
dmesg_msg_iter_next(
861 bt_self_message_iterator
*self_msg_iter
,
862 bt_message_array_const msgs
, uint64_t capacity
,
865 struct dmesg_msg_iter
*dmesg_msg_iter
=
866 bt_self_message_iterator_get_data(
868 bt_self_message_iterator_status status
=
869 BT_SELF_MESSAGE_ITERATOR_STATUS_OK
;
872 while (i
< capacity
&&
873 status
== BT_SELF_MESSAGE_ITERATOR_STATUS_OK
) {
874 bt_message
*priv_msg
= NULL
;
876 status
= dmesg_msg_iter_next_one(dmesg_msg_iter
,
879 if (status
== BT_SELF_MESSAGE_ITERATOR_STATUS_OK
) {
886 * Even if dmesg_msg_iter_next_one() returned
887 * something else than
888 * BT_SELF_MESSAGE_ITERATOR_STATUS_OK, we
889 * accumulated message objects in the output
890 * message array, so we need to return
891 * BT_SELF_MESSAGE_ITERATOR_STATUS_OK so that they
892 * are transfered to downstream. This other status
893 * occurs again the next time muxer_msg_iter_do_next()
894 * is called, possibly without any accumulated
895 * message, in which case we'll return it.
898 status
= BT_SELF_MESSAGE_ITERATOR_STATUS_OK
;
905 bt_bool
dmesg_msg_iter_can_seek_beginning(
906 bt_self_message_iterator
*self_msg_iter
)
908 struct dmesg_msg_iter
*dmesg_msg_iter
=
909 bt_self_message_iterator_get_data(self_msg_iter
);
911 /* Can't seek the beginning of the standard input stream */
912 return !dmesg_msg_iter
->dmesg_comp
->params
.read_from_stdin
;
916 bt_self_message_iterator_status
dmesg_msg_iter_seek_beginning(
917 bt_self_message_iterator
*self_msg_iter
)
919 struct dmesg_msg_iter
*dmesg_msg_iter
=
920 bt_self_message_iterator_get_data(self_msg_iter
);
922 BT_ASSERT(!dmesg_msg_iter
->dmesg_comp
->params
.read_from_stdin
);
924 BT_MESSAGE_PUT_REF_AND_RESET(dmesg_msg_iter
->tmp_event_msg
);
925 dmesg_msg_iter
->last_clock_value
= 0;
926 dmesg_msg_iter
->state
= STATE_EMIT_STREAM_BEGINNING
;
927 return BT_SELF_MESSAGE_ITERATOR_STATUS_OK
;